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Commit | Line | Data |
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cc73685d | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
1d52bdf7 | 2 | |
481f03ef CB |
3 | #include "config.h" |
4 | ||
9d257a2a | 5 | #include <arpa/inet.h> |
8f3e280e CB |
6 | #include <dirent.h> |
7 | #include <errno.h> | |
8 | #include <fcntl.h> | |
9 | #include <grp.h> | |
10 | #include <inttypes.h> | |
11 | #include <libgen.h> | |
9d257a2a CB |
12 | #include <linux/loop.h> |
13 | #include <net/if.h> | |
14 | #include <netinet/in.h> | |
8f3e280e CB |
15 | #include <pwd.h> |
16 | #include <stdarg.h> | |
1b82d721 | 17 | #include <stdbool.h> |
0ad19a3f | 18 | #include <stdio.h> |
0ad19a3f | 19 | #include <stdlib.h> |
0ad19a3f | 20 | #include <string.h> |
8f3e280e CB |
21 | #include <sys/mman.h> |
22 | #include <sys/mount.h> | |
23 | #include <sys/param.h> | |
24 | #include <sys/prctl.h> | |
6a49f05e | 25 | #include <sys/sendfile.h> |
8f3e280e | 26 | #include <sys/socket.h> |
9d257a2a | 27 | #include <sys/stat.h> |
2d76d1d7 | 28 | #include <sys/syscall.h> |
9d257a2a | 29 | #include <sys/sysmacros.h> |
97e9cfa0 | 30 | #include <sys/types.h> |
8f3e280e CB |
31 | #include <sys/utsname.h> |
32 | #include <sys/wait.h> | |
9d257a2a CB |
33 | #include <time.h> |
34 | #include <unistd.h> | |
1d52bdf7 | 35 | |
cdb4f412 | 36 | #include "conf.h" |
d38dd64a CB |
37 | #include "af_unix.h" |
38 | #include "caps.h" | |
5f126977 | 39 | #include "cgroups/cgroup.h" |
52ce8504 | 40 | #include "compiler.h" |
d38dd64a CB |
41 | #include "confile.h" |
42 | #include "confile_utils.h" | |
43 | #include "error.h" | |
44 | #include "log.h" | |
45 | #include "lsm/lsm.h" | |
46 | #include "lxclock.h" | |
47 | #include "lxcseccomp.h" | |
48 | #include "macro.h" | |
2f443e88 | 49 | #include "memory_utils.h" |
7f88a1a2 | 50 | #include "mount_utils.h" |
d38dd64a CB |
51 | #include "namespace.h" |
52 | #include "network.h" | |
589a930f | 53 | #include "open_utils.h" |
d38dd64a | 54 | #include "parse.h" |
f40988c7 | 55 | #include "process_utils.h" |
d38dd64a CB |
56 | #include "ringbuf.h" |
57 | #include "start.h" | |
5f126977 | 58 | #include "storage/storage.h" |
d38dd64a | 59 | #include "storage/overlay.h" |
1b82d721 | 60 | #include "sync.h" |
6b3d24d7 | 61 | #include "syscall_wrappers.h" |
d38dd64a CB |
62 | #include "terminal.h" |
63 | #include "utils.h" | |
20502652 | 64 | #include "uuid.h" |
d38dd64a | 65 | |
af6824fc | 66 | #ifdef MAJOR_IN_MKDEV |
9d257a2a | 67 | #include <sys/mkdev.h> |
af6824fc | 68 | #endif |
af6824fc | 69 | |
614305f3 | 70 | #ifdef HAVE_STATVFS |
2938f7c8 | 71 | #include <sys/statvfs.h> |
614305f3 | 72 | #endif |
e827ff7e | 73 | |
35eb5cdc | 74 | #if HAVE_OPENPTY |
b0a33c1e | 75 | #include <pty.h> |
e827ff7e | 76 | #else |
58db1a61 | 77 | #include "openpty.h" |
e827ff7e | 78 | #endif |
0ad19a3f | 79 | |
9d257a2a CB |
80 | #if HAVE_LIBCAP |
81 | #include <sys/capability.h> | |
82 | #endif | |
83 | ||
db4af8c5 | 84 | #if !HAVE_STRLCAT |
58db1a61 | 85 | #include "strlcat.h" |
f1e05b90 DJ |
86 | #endif |
87 | ||
9d257a2a | 88 | #if IS_BIONIC |
58db1a61 | 89 | #include "lxcmntent.h" |
9d257a2a CB |
90 | #else |
91 | #include <mntent.h> | |
92 | #endif | |
93 | ||
6ae86a9c | 94 | #if !HAVE_PRLIMIT && HAVE_PRLIMIT64 |
58db1a61 | 95 | #include "prlimit.h" |
9d257a2a CB |
96 | #endif |
97 | ||
db4af8c5 | 98 | #if !HAVE_STRLCPY |
58db1a61 | 99 | #include "strlcpy.h" |
f6815906 CB |
100 | #endif |
101 | ||
db4af8c5 | 102 | #if !HAVE_STRCHRNUL |
58db1a61 | 103 | #include "strchrnul.h" |
60933dae CB |
104 | #endif |
105 | ||
ac2cecc4 | 106 | lxc_log_define(conf, lxc); |
e5bda9ee | 107 | |
52ce8504 CB |
108 | /* |
109 | * The lxc_conf of the container currently being worked on in an API call. | |
0fd73091 CB |
110 | * This is used in the error calls. |
111 | */ | |
d7f19646 | 112 | thread_local struct lxc_conf *current_config; |
8912711c | 113 | |
0fd73091 CB |
114 | char *lxchook_names[NUM_LXC_HOOKS] = { |
115 | "pre-start", | |
116 | "pre-mount", | |
117 | "mount", | |
118 | "autodev", | |
119 | "start", | |
120 | "stop", | |
121 | "post-stop", | |
122 | "clone", | |
123 | "destroy", | |
124 | "start-host" | |
125 | }; | |
72d0e1cb | 126 | |
998ac676 RT |
127 | struct mount_opt { |
128 | char *name; | |
129 | int clear; | |
1b82d721 CB |
130 | bool recursive; |
131 | __u64 flag; | |
1e4bce2c | 132 | int legacy_flag; |
998ac676 RT |
133 | }; |
134 | ||
81810dd1 DL |
135 | struct caps_opt { |
136 | char *name; | |
7418b27f | 137 | __u32 value; |
81810dd1 DL |
138 | }; |
139 | ||
c6d09e15 WB |
140 | struct limit_opt { |
141 | char *name; | |
142 | int value; | |
143 | }; | |
144 | ||
998ac676 | 145 | static struct mount_opt mount_opt[] = { |
1b82d721 CB |
146 | { "atime", 1, false, MOUNT_ATTR_NOATIME, MS_NOATIME }, |
147 | { "dev", 1, false, MOUNT_ATTR_NODEV, MS_NODEV }, | |
148 | { "diratime", 1, false, MOUNT_ATTR_NODIRATIME, MS_NODIRATIME }, | |
149 | { "exec", 1, false, MOUNT_ATTR_NOEXEC, MS_NOEXEC }, | |
150 | { "noatime", 0, false, MOUNT_ATTR_NOATIME, MS_NOATIME }, | |
151 | { "nodev", 0, false, MOUNT_ATTR_NODEV, MS_NODEV }, | |
152 | { "nodiratime", 0, false, MOUNT_ATTR_NODIRATIME, MS_NODIRATIME }, | |
153 | { "noexec", 0, false, MOUNT_ATTR_NOEXEC, MS_NOEXEC }, | |
154 | { "norelatime", 1, false, MOUNT_ATTR_RELATIME, MS_RELATIME }, | |
155 | { "nostrictatime", 1, false, MOUNT_ATTR_STRICTATIME, MS_STRICTATIME }, | |
156 | { "nosuid", 0, false, MOUNT_ATTR_NOSUID, MS_NOSUID }, | |
157 | { "relatime", 0, false, MOUNT_ATTR_RELATIME, MS_RELATIME }, | |
158 | { "ro", 0, false, MOUNT_ATTR_RDONLY, MS_RDONLY }, | |
159 | { "rw", 1, false, MOUNT_ATTR_RDONLY, MS_RDONLY }, | |
160 | { "strictatime", 0, false, MOUNT_ATTR_STRICTATIME, MS_STRICTATIME }, | |
161 | { "suid", 1, false, MOUNT_ATTR_NOSUID, MS_NOSUID }, | |
162 | ||
163 | { "bind", 0, false, 0, MS_BIND }, | |
164 | { "defaults", 0, false, 0, 0 }, | |
165 | { "rbind", 0, true, 0, MS_BIND | MS_REC }, | |
166 | ||
167 | { "sync", 0, false, ~0, MS_SYNCHRONOUS }, | |
168 | { "async", 1, false, ~0, MS_SYNCHRONOUS }, | |
169 | { "dirsync", 0, false, ~0, MS_DIRSYNC }, | |
170 | { "lazytime", 0, false, ~0, MS_LAZYTIME }, | |
171 | { "mand", 0, false, ~0, MS_MANDLOCK }, | |
172 | { "nomand", 1, false, ~0, MS_MANDLOCK }, | |
173 | { "remount", 0, false, ~0, MS_REMOUNT }, | |
174 | ||
175 | { NULL, 0, false, ~0, ~0 }, | |
998ac676 RT |
176 | }; |
177 | ||
d840039e | 178 | static struct mount_opt propagation_opt[] = { |
1b82d721 CB |
179 | { "private", 0, false, MS_PRIVATE, MS_PRIVATE }, |
180 | { "shared", 0, false, MS_SHARED, MS_SHARED }, | |
181 | { "slave", 0, false, MS_SLAVE, MS_SLAVE }, | |
182 | { "unbindable", 0, false, MS_UNBINDABLE, MS_UNBINDABLE }, | |
183 | { "rprivate", 0, true, MS_PRIVATE, MS_PRIVATE | MS_REC }, | |
184 | { "rshared", 0, true, MS_SHARED, MS_SHARED | MS_REC }, | |
185 | { "rslave", 0, true, MS_SLAVE, MS_SLAVE | MS_REC }, | |
186 | { "runbindable", 0, true, MS_UNBINDABLE, MS_UNBINDABLE | MS_REC }, | |
622d344d | 187 | { NULL, 0, false, 0, 0 }, |
d840039e YT |
188 | }; |
189 | ||
81810dd1 | 190 | static struct caps_opt caps_opt[] = { |
8560cd36 | 191 | #if HAVE_LIBCAP |
7b4cd468 CB |
192 | { "chown", CAP_CHOWN }, |
193 | { "dac_override", CAP_DAC_OVERRIDE }, | |
194 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
195 | { "fowner", CAP_FOWNER }, | |
196 | { "fsetid", CAP_FSETID }, | |
197 | { "kill", CAP_KILL }, | |
198 | { "setgid", CAP_SETGID }, | |
199 | { "setuid", CAP_SETUID }, | |
200 | { "setpcap", CAP_SETPCAP }, | |
201 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
202 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
203 | { "net_broadcast", CAP_NET_BROADCAST }, | |
204 | { "net_admin", CAP_NET_ADMIN }, | |
205 | { "net_raw", CAP_NET_RAW }, | |
206 | { "ipc_lock", CAP_IPC_LOCK }, | |
207 | { "ipc_owner", CAP_IPC_OWNER }, | |
208 | { "sys_module", CAP_SYS_MODULE }, | |
209 | { "sys_rawio", CAP_SYS_RAWIO }, | |
210 | { "sys_chroot", CAP_SYS_CHROOT }, | |
211 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
212 | { "sys_pacct", CAP_SYS_PACCT }, | |
213 | { "sys_admin", CAP_SYS_ADMIN }, | |
214 | { "sys_boot", CAP_SYS_BOOT }, | |
215 | { "sys_nice", CAP_SYS_NICE }, | |
216 | { "sys_resource", CAP_SYS_RESOURCE }, | |
217 | { "sys_time", CAP_SYS_TIME }, | |
218 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
219 | { "mknod", CAP_MKNOD }, | |
220 | { "lease", CAP_LEASE }, | |
221 | { "audit_write", CAP_AUDIT_WRITE }, | |
222 | { "audit_control", CAP_AUDIT_CONTROL }, | |
223 | { "setfcap", CAP_SETFCAP }, | |
224 | { "mac_override", CAP_MAC_OVERRIDE }, | |
225 | { "mac_admin", CAP_MAC_ADMIN }, | |
226 | { "syslog", CAP_SYSLOG }, | |
227 | { "wake_alarm", CAP_WAKE_ALARM }, | |
228 | { "block_suspend", CAP_BLOCK_SUSPEND }, | |
229 | { "audit_read", CAP_AUDIT_READ }, | |
230 | { "perfmon", CAP_PERFMON }, | |
231 | { "bpf", CAP_BPF }, | |
232 | { "checkpoint_restore", CAP_CHECKPOINT_RESTORE }, | |
2b54359b | 233 | #endif |
8560cd36 | 234 | }; |
81810dd1 | 235 | |
c6d09e15 WB |
236 | static struct limit_opt limit_opt[] = { |
237 | #ifdef RLIMIT_AS | |
238 | { "as", RLIMIT_AS }, | |
239 | #endif | |
240 | #ifdef RLIMIT_CORE | |
241 | { "core", RLIMIT_CORE }, | |
242 | #endif | |
243 | #ifdef RLIMIT_CPU | |
244 | { "cpu", RLIMIT_CPU }, | |
245 | #endif | |
246 | #ifdef RLIMIT_DATA | |
247 | { "data", RLIMIT_DATA }, | |
248 | #endif | |
249 | #ifdef RLIMIT_FSIZE | |
250 | { "fsize", RLIMIT_FSIZE }, | |
251 | #endif | |
252 | #ifdef RLIMIT_LOCKS | |
253 | { "locks", RLIMIT_LOCKS }, | |
254 | #endif | |
255 | #ifdef RLIMIT_MEMLOCK | |
256 | { "memlock", RLIMIT_MEMLOCK }, | |
257 | #endif | |
258 | #ifdef RLIMIT_MSGQUEUE | |
259 | { "msgqueue", RLIMIT_MSGQUEUE }, | |
260 | #endif | |
261 | #ifdef RLIMIT_NICE | |
262 | { "nice", RLIMIT_NICE }, | |
263 | #endif | |
264 | #ifdef RLIMIT_NOFILE | |
265 | { "nofile", RLIMIT_NOFILE }, | |
266 | #endif | |
267 | #ifdef RLIMIT_NPROC | |
268 | { "nproc", RLIMIT_NPROC }, | |
269 | #endif | |
270 | #ifdef RLIMIT_RSS | |
271 | { "rss", RLIMIT_RSS }, | |
272 | #endif | |
273 | #ifdef RLIMIT_RTPRIO | |
274 | { "rtprio", RLIMIT_RTPRIO }, | |
275 | #endif | |
276 | #ifdef RLIMIT_RTTIME | |
277 | { "rttime", RLIMIT_RTTIME }, | |
278 | #endif | |
279 | #ifdef RLIMIT_SIGPENDING | |
280 | { "sigpending", RLIMIT_SIGPENDING }, | |
281 | #endif | |
282 | #ifdef RLIMIT_STACK | |
283 | { "stack", RLIMIT_STACK }, | |
284 | #endif | |
285 | }; | |
286 | ||
91c3830e SH |
287 | static int run_buffer(char *buffer) |
288 | { | |
cc6a0e78 | 289 | __do_free char *output = NULL; |
55022530 | 290 | __do_lxc_pclose struct lxc_popen_FILE *f = NULL; |
ebf3a6af | 291 | int fd, ret; |
91c3830e | 292 | |
ebec9176 | 293 | f = lxc_popen(buffer); |
55022530 CB |
294 | if (!f) |
295 | return log_error_errno(-1, errno, "Failed to popen() %s", buffer); | |
91c3830e | 296 | |
b8e43ef0 | 297 | output = zalloc(LXC_LOG_BUFFER_SIZE); |
55022530 CB |
298 | if (!output) |
299 | return log_error_errno(-1, ENOMEM, "Failed to allocate memory for %s", buffer); | |
91c3830e | 300 | |
ebf3a6af | 301 | fd = fileno(f->f); |
55022530 CB |
302 | if (fd < 0) |
303 | return log_error_errno(-1, errno, "Failed to retrieve underlying file descriptor"); | |
ebf3a6af CB |
304 | |
305 | for (int i = 0; i < 10; i++) { | |
306 | ssize_t bytes_read; | |
307 | ||
308 | bytes_read = lxc_read_nointr(fd, output, LXC_LOG_BUFFER_SIZE - 1); | |
309 | if (bytes_read > 0) { | |
310 | output[bytes_read] = '\0'; | |
311 | DEBUG("Script %s produced output: %s", buffer, output); | |
312 | continue; | |
313 | } | |
314 | ||
315 | break; | |
316 | } | |
91c3830e | 317 | |
55022530 CB |
318 | ret = lxc_pclose(move_ptr(f)); |
319 | if (ret == -1) | |
320 | return log_error_errno(-1, errno, "Script exited with error"); | |
321 | else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) | |
322 | return log_error(-1, "Script exited with status %d", WEXITSTATUS(ret)); | |
323 | else if (WIFSIGNALED(ret)) | |
324 | return log_error(-1, "Script terminated by signal %d", WTERMSIG(ret)); | |
91c3830e SH |
325 | |
326 | return 0; | |
327 | } | |
328 | ||
14a7b0f9 CB |
329 | int run_script_argv(const char *name, unsigned int hook_version, |
330 | const char *section, const char *script, | |
586b1ce7 | 331 | const char *hookname, char **argv) |
148e91f5 | 332 | { |
e1a94937 | 333 | __do_free char *buffer = NULL; |
3f60c2f7 | 334 | int buf_pos, i, ret; |
d08e5708 | 335 | size_t size = 0; |
148e91f5 | 336 | |
3f60c2f7 | 337 | if (hook_version == 0) |
55022530 CB |
338 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\"", |
339 | script, name, section); | |
3f60c2f7 CB |
340 | else |
341 | INFO("Executing script \"%s\" for container \"%s\"", script, name); | |
148e91f5 | 342 | |
586b1ce7 CB |
343 | for (i = 0; argv && argv[i]; i++) |
344 | size += strlen(argv[i]) + 1; | |
148e91f5 | 345 | |
6333c915 CB |
346 | size += STRLITERALLEN("exec"); |
347 | size++; | |
148e91f5 | 348 | size += strlen(script); |
3f60c2f7 CB |
349 | size++; |
350 | ||
148e91f5 | 351 | if (size > INT_MAX) |
3f60c2f7 | 352 | return -EFBIG; |
148e91f5 | 353 | |
3f60c2f7 | 354 | if (hook_version == 0) { |
d08e5708 CB |
355 | size += strlen(hookname); |
356 | size++; | |
357 | ||
358 | size += strlen(name); | |
359 | size++; | |
360 | ||
361 | size += strlen(section); | |
362 | size++; | |
363 | ||
364 | if (size > INT_MAX) | |
365 | return -EFBIG; | |
327cce76 | 366 | } |
3f60c2f7 | 367 | |
b8e43ef0 | 368 | buffer = zalloc(size); |
6f8d00d2 CB |
369 | if (!buffer) |
370 | return -ENOMEM; | |
371 | ||
327cce76 | 372 | if (hook_version == 0) |
9bcde680 | 373 | buf_pos = strnprintf(buffer, size, "exec %s %s %s %s", script, name, section, hookname); |
327cce76 | 374 | else |
9bcde680 CB |
375 | buf_pos = strnprintf(buffer, size, "exec %s", script); |
376 | if (buf_pos < 0) | |
55022530 | 377 | return log_error_errno(-1, errno, "Failed to create command line for script \"%s\"", script); |
3f60c2f7 | 378 | |
327cce76 | 379 | if (hook_version == 1) { |
3f60c2f7 CB |
380 | ret = setenv("LXC_HOOK_TYPE", hookname, 1); |
381 | if (ret < 0) { | |
55022530 | 382 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_HOOK_TYPE=%s", hookname); |
3f60c2f7 | 383 | } |
90f20466 | 384 | TRACE("Set environment variable: LXC_HOOK_TYPE=%s", hookname); |
3f60c2f7 CB |
385 | |
386 | ret = setenv("LXC_HOOK_SECTION", section, 1); | |
55022530 CB |
387 | if (ret < 0) |
388 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_HOOK_SECTION=%s", section); | |
3f60c2f7 | 389 | TRACE("Set environment variable: LXC_HOOK_SECTION=%s", section); |
14a7b0f9 | 390 | |
71528742 | 391 | if (strequal(section, "net")) { |
14a7b0f9 CB |
392 | char *parent; |
393 | ||
586b1ce7 | 394 | if (!argv || !argv[0]) |
e1a94937 | 395 | return -1; |
14a7b0f9 | 396 | |
586b1ce7 | 397 | ret = setenv("LXC_NET_TYPE", argv[0], 1); |
55022530 CB |
398 | if (ret < 0) |
399 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_TYPE=%s", argv[0]); | |
586b1ce7 | 400 | TRACE("Set environment variable: LXC_NET_TYPE=%s", argv[0]); |
14a7b0f9 | 401 | |
586b1ce7 | 402 | parent = argv[1] ? argv[1] : ""; |
14a7b0f9 | 403 | |
71528742 | 404 | if (strequal(argv[0], "macvlan")) { |
14a7b0f9 | 405 | ret = setenv("LXC_NET_PARENT", parent, 1); |
55022530 CB |
406 | if (ret < 0) |
407 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_PARENT=%s", parent); | |
14a7b0f9 | 408 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); |
71528742 | 409 | } else if (strequal(argv[0], "phys")) { |
14a7b0f9 | 410 | ret = setenv("LXC_NET_PARENT", parent, 1); |
55022530 CB |
411 | if (ret < 0) |
412 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_PARENT=%s", parent); | |
14a7b0f9 | 413 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); |
71528742 | 414 | } else if (strequal(argv[0], "veth")) { |
586b1ce7 | 415 | char *peer = argv[2] ? argv[2] : ""; |
14a7b0f9 CB |
416 | |
417 | ret = setenv("LXC_NET_PEER", peer, 1); | |
55022530 CB |
418 | if (ret < 0) |
419 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_PEER=%s", peer); | |
14a7b0f9 CB |
420 | TRACE("Set environment variable: LXC_NET_PEER=%s", peer); |
421 | ||
422 | ret = setenv("LXC_NET_PARENT", parent, 1); | |
55022530 CB |
423 | if (ret < 0) |
424 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_PARENT=%s", parent); | |
14a7b0f9 CB |
425 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); |
426 | } | |
427 | } | |
148e91f5 SH |
428 | } |
429 | ||
586b1ce7 | 430 | for (i = 0; argv && argv[i]; i++) { |
3f60c2f7 CB |
431 | size_t len = size - buf_pos; |
432 | ||
9bcde680 CB |
433 | ret = strnprintf(buffer + buf_pos, len, " %s", argv[i]); |
434 | if (ret < 0) | |
55022530 | 435 | return log_error_errno(-1, errno, "Failed to create command line for script \"%s\"", script); |
3f60c2f7 | 436 | buf_pos += ret; |
148e91f5 SH |
437 | } |
438 | ||
e1a94937 | 439 | return run_buffer(buffer); |
148e91f5 SH |
440 | } |
441 | ||
811ef482 | 442 | int run_script(const char *name, const char *section, const char *script, ...) |
e3b4c4c4 | 443 | { |
2f443e88 | 444 | __do_free char *buffer = NULL; |
abbfd20b | 445 | int ret; |
2f443e88 | 446 | char *p; |
abbfd20b | 447 | va_list ap; |
0fd73091 | 448 | size_t size = 0; |
751d9dcd | 449 | |
0fd73091 | 450 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\"", |
751d9dcd | 451 | script, name, section); |
e3b4c4c4 | 452 | |
abbfd20b DL |
453 | va_start(ap, script); |
454 | while ((p = va_arg(ap, char *))) | |
95642a10 | 455 | size += strlen(p) + 1; |
abbfd20b DL |
456 | va_end(ap); |
457 | ||
6333c915 | 458 | size += STRLITERALLEN("exec"); |
abbfd20b DL |
459 | size += strlen(script); |
460 | size += strlen(name); | |
461 | size += strlen(section); | |
6d1a5f93 | 462 | size += 4; |
abbfd20b | 463 | |
95642a10 MS |
464 | if (size > INT_MAX) |
465 | return -1; | |
466 | ||
2f443e88 | 467 | buffer = must_realloc(NULL, size); |
9bcde680 CB |
468 | ret = strnprintf(buffer, size, "exec %s %s %s", script, name, section); |
469 | if (ret < 0) | |
9ba8130c | 470 | return -1; |
751d9dcd | 471 | |
abbfd20b | 472 | va_start(ap, script); |
9ba8130c | 473 | while ((p = va_arg(ap, char *))) { |
062b72c6 | 474 | int len = size - ret; |
9ba8130c | 475 | int rc; |
9bcde680 CB |
476 | rc = strnprintf(buffer + ret, len, " %s", p); |
477 | if (rc < 0) { | |
7b5a2435 | 478 | va_end(ap); |
9ba8130c | 479 | return -1; |
7b5a2435 | 480 | } |
9ba8130c SH |
481 | ret += rc; |
482 | } | |
abbfd20b | 483 | va_end(ap); |
751d9dcd | 484 | |
91c3830e | 485 | return run_buffer(buffer); |
e3b4c4c4 ST |
486 | } |
487 | ||
4e86cad3 CB |
488 | int lxc_storage_prepare(struct lxc_conf *conf) |
489 | { | |
490 | int ret; | |
491 | struct lxc_rootfs *rootfs = &conf->rootfs; | |
492 | ||
493 | if (!rootfs->path) { | |
494 | ret = mount("", "/", NULL, MS_SLAVE | MS_REC, 0); | |
495 | if (ret < 0) | |
496 | return log_error_errno(-1, errno, "Failed to recursively turn root mount tree into dependent mount"); | |
497 | ||
498 | rootfs->dfd_mnt = open_at(-EBADF, "/", PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_ABSOLUTE, 0); | |
499 | if (rootfs->dfd_mnt < 0) | |
500 | return -errno; | |
501 | ||
502 | return 0; | |
503 | } | |
504 | ||
505 | ret = access(rootfs->mount, F_OK); | |
506 | if (ret != 0) | |
507 | return log_error_errno(-1, errno, "Failed to access to \"%s\". Check it is present", | |
508 | rootfs->mount); | |
509 | ||
510 | rootfs->storage = storage_init(conf); | |
511 | if (!rootfs->storage) | |
512 | return log_error(-1, "Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", | |
513 | rootfs->path, rootfs->mount, | |
e73af35b | 514 | rootfs->mnt_opts.raw_options ? rootfs->mnt_opts.raw_options : "(null)"); |
4e86cad3 CB |
515 | |
516 | return 0; | |
517 | } | |
518 | ||
519 | void lxc_storage_put(struct lxc_conf *conf) | |
520 | { | |
521 | storage_put(conf->rootfs.storage); | |
522 | conf->rootfs.storage = NULL; | |
523 | } | |
524 | ||
79ff643d | 525 | /* lxc_rootfs_prepare |
63fc76c3 | 526 | * if rootfs is a directory, then open ${rootfs}/.lxc-keep for writing for |
b7ed4bf0 CS |
527 | * the duration of the container run, to prevent the container from marking |
528 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
63fc76c3 GJ |
529 | * no name pollution is happens. |
530 | * don't unlink on NFS to avoid random named stale handles. | |
0c547523 | 531 | */ |
239f29c9 | 532 | int lxc_rootfs_init(struct lxc_conf *conf, bool userns) |
0c547523 | 533 | { |
1b82d721 | 534 | __do_close int dfd_path = -EBADF, fd_pin = -EBADF; |
79ff643d CB |
535 | int ret; |
536 | struct stat st; | |
537 | struct statfs stfs; | |
4e86cad3 CB |
538 | struct lxc_rootfs *rootfs = &conf->rootfs; |
539 | ||
540 | ret = lxc_storage_prepare(conf); | |
541 | if (ret) | |
542 | return syserror_set(-EINVAL, "Failed to prepare rootfs storage"); | |
0c547523 | 543 | |
e26cf563 | 544 | if (!is_empty_string(rootfs->mnt_opts.userns_path)) { |
657ed14a CB |
545 | if (!rootfs->path) |
546 | return syserror_set(-EINVAL, "Idmapped rootfs currently only supported with separate rootfs for container"); | |
547 | ||
548 | if (rootfs->bdev_type && !strequal(rootfs->bdev_type, "dir")) | |
549 | return syserror_set(-EINVAL, "Idmapped rootfs currently only supports the \"dir\" storage driver"); | |
e26cf563 CB |
550 | } |
551 | ||
c119f018 CB |
552 | if (!rootfs->path) |
553 | return log_trace(0, "Not pinning because container does not have a rootfs"); | |
e99ee0de | 554 | |
c119f018 CB |
555 | if (userns) |
556 | return log_trace(0, "Not pinning because container runs in user namespace"); | |
79ff643d | 557 | |
c119f018 CB |
558 | if (rootfs->bdev_type) { |
559 | if (strequal(rootfs->bdev_type, "overlay") || | |
560 | strequal(rootfs->bdev_type, "overlayfs")) | |
561 | return log_trace_errno(0, EINVAL, "Not pinning on stacking filesystem"); | |
0c547523 | 562 | |
c119f018 CB |
563 | if (strequal(rootfs->bdev_type, "zfs")) |
564 | return log_trace_errno(0, EINVAL, "Not pinning on ZFS filesystem"); | |
e26cf563 | 565 | } |
79ff643d | 566 | |
c119f018 CB |
567 | dfd_path = open_at(-EBADF, rootfs->path, PROTECT_OPATH_FILE, 0, 0); |
568 | if (dfd_path < 0) | |
569 | return syserror("Failed to open \"%s\"", rootfs->path); | |
570 | ||
79ff643d | 571 | ret = fstat(dfd_path, &st); |
957c4704 | 572 | if (ret < 0) |
79ff643d | 573 | return log_trace_errno(-errno, errno, "Failed to retrieve file status"); |
0c547523 | 574 | |
79ff643d CB |
575 | if (!S_ISDIR(st.st_mode)) |
576 | return log_trace_errno(0, ENOTDIR, "Not pinning because file descriptor is not a directory"); | |
0c547523 | 577 | |
79ff643d CB |
578 | fd_pin = open_at(dfd_path, ".lxc_keep", |
579 | PROTECT_OPEN | O_CREAT, | |
580 | PROTECT_LOOKUP_BENEATH, | |
581 | S_IWUSR | S_IRUSR); | |
e859a5ee | 582 | if (fd_pin < 0) { |
65d83293 | 583 | if (errno == EROFS) |
e859a5ee | 584 | return log_trace_errno(0, EROFS, "Not pinning on read-only filesystem"); |
e26cf563 | 585 | return syserror("Failed to pin rootfs"); |
e859a5ee | 586 | } |
0c547523 | 587 | |
79ff643d | 588 | TRACE("Pinned rootfs %d(.lxc_keep)", fd_pin); |
0fd73091 | 589 | |
79ff643d CB |
590 | ret = fstatfs(fd_pin, &stfs); |
591 | if (ret < 0) { | |
592 | SYSWARN("Failed to retrieve filesystem status"); | |
593 | goto out; | |
594 | } | |
63fc76c3 | 595 | |
79ff643d CB |
596 | if (stfs.f_type == NFS_SUPER_MAGIC) { |
597 | DEBUG("Not unlinking pinned file on NFS"); | |
598 | goto out; | |
599 | } | |
63fc76c3 | 600 | |
79ff643d CB |
601 | if (unlinkat(dfd_path, ".lxc_keep", 0)) |
602 | SYSTRACE("Failed to unlink rootfs pinning file %d(.lxc_keep)", dfd_path); | |
603 | else | |
604 | TRACE("Unlinked pinned file %d(.lxc_keep)", dfd_path); | |
0fd73091 | 605 | |
79ff643d CB |
606 | out: |
607 | rootfs->fd_path_pin = move_fd(fd_pin); | |
608 | return 0; | |
0c547523 SH |
609 | } |
610 | ||
4b875ef9 CB |
611 | int lxc_rootfs_prepare_parent(struct lxc_handler *handler) |
612 | { | |
613 | __do_close int dfd_idmapped = -EBADF, fd_userns = -EBADF; | |
614 | struct lxc_rootfs *rootfs = &handler->conf->rootfs; | |
615 | struct lxc_storage *storage = rootfs->storage; | |
704cadd5 | 616 | const struct lxc_mount_options *mnt_opts = &rootfs->mnt_opts; |
4b875ef9 CB |
617 | int ret; |
618 | const char *path_source; | |
619 | ||
0589d744 | 620 | if (list_empty(&handler->conf->id_map)) |
4b875ef9 CB |
621 | return 0; |
622 | ||
623 | if (is_empty_string(rootfs->mnt_opts.userns_path)) | |
624 | return 0; | |
625 | ||
626 | if (handler->conf->rootfs_setup) | |
627 | return 0; | |
628 | ||
629 | if (rootfs_is_blockdev(handler->conf)) | |
630 | return syserror_set(-EOPNOTSUPP, "Idmapped mounts on block-backed storage not yet supported"); | |
631 | ||
632 | if (!can_use_bind_mounts()) | |
633 | return syserror_set(-EOPNOTSUPP, "Kernel does not support the new mount api"); | |
634 | ||
1b82d721 | 635 | if (strequal(rootfs->mnt_opts.userns_path, "container")) |
4b875ef9 CB |
636 | fd_userns = dup_cloexec(handler->nsfd[LXC_NS_USER]); |
637 | else | |
638 | fd_userns = open_at(-EBADF, rootfs->mnt_opts.userns_path, | |
639 | PROTECT_OPEN_WITH_TRAILING_SYMLINKS, 0, 0); | |
640 | if (fd_userns < 0) | |
641 | return syserror("Failed to open user namespace"); | |
642 | ||
643 | path_source = lxc_storage_get_path(storage->src, storage->type); | |
644 | ||
704cadd5 CB |
645 | dfd_idmapped = create_detached_idmapped_mount(path_source, fd_userns, true, |
646 | mnt_opts->attr.attr_set, | |
647 | mnt_opts->attr.attr_clr); | |
4b875ef9 CB |
648 | if (dfd_idmapped < 0) |
649 | return syserror("Failed to create detached idmapped mount"); | |
650 | ||
651 | ret = lxc_abstract_unix_send_fds(handler->data_sock[0], &dfd_idmapped, 1, NULL, 0); | |
652 | if (ret < 0) | |
653 | return syserror("Failed to send detached idmapped mount fd"); | |
654 | ||
655 | TRACE("Created detached idmapped mount %d", dfd_idmapped); | |
656 | return 0; | |
657 | } | |
658 | ||
6b741397 CB |
659 | static int add_shmount_to_list(struct lxc_conf *conf) |
660 | { | |
6b5a54cd | 661 | char new_mount[PATH_MAX]; |
0d190408 | 662 | /* Offset for the leading '/' since the path_cont |
6b741397 CB |
663 | * is absolute inside the container. |
664 | */ | |
665 | int offset = 1, ret = -1; | |
0d190408 | 666 | |
9bcde680 | 667 | ret = strnprintf(new_mount, sizeof(new_mount), |
6b741397 CB |
668 | "%s %s none bind,create=dir 0 0", conf->shmount.path_host, |
669 | conf->shmount.path_cont + offset); | |
9bcde680 | 670 | if (ret < 0) |
0d190408 LT |
671 | return -1; |
672 | ||
6b741397 | 673 | return add_elem_to_mount_list(new_mount, conf); |
0d190408 LT |
674 | } |
675 | ||
6d25a524 | 676 | static int lxc_mount_auto_mounts(struct lxc_handler *handler, int flags) |
368bbc02 | 677 | { |
7b371c1e | 678 | int i, ret; |
b06b8511 CS |
679 | static struct { |
680 | int match_mask; | |
681 | int match_flag; | |
682 | const char *source; | |
683 | const char *destination; | |
684 | const char *fstype; | |
685 | unsigned long flags; | |
686 | const char *options; | |
e8b9c9ec | 687 | bool requires_cap_net_admin; |
b06b8511 | 688 | } default_mounts[] = { |
0fd73091 CB |
689 | /* Read-only bind-mounting... In older kernels, doing that |
690 | * required to do one MS_BIND mount and then | |
691 | * MS_REMOUNT|MS_RDONLY the same one. According to mount(2) | |
692 | * manpage, MS_BIND honors MS_RDONLY from kernel 2.6.26 | |
693 | * onwards. However, this apparently does not work on kernel | |
694 | * 3.8. Unfortunately, on that very same kernel, doing the same | |
695 | * trick as above doesn't seem to work either, there one needs | |
696 | * to ALSO specify MS_BIND for the remount, otherwise the | |
697 | * entire fs is remounted read-only or the mount fails because | |
698 | * it's busy... MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for | |
699 | * kernels as low as 2.6.32... | |
368bbc02 | 700 | */ |
5d1bf4c4 | 701 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL, false }, |
592fd47a | 702 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
cb4889ab | 703 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL, true, }, |
5d1bf4c4 CB |
704 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL, false }, |
705 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL, false }, | |
706 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL, true }, | |
707 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL, false }, | |
708 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL, false }, | |
709 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL, false }, | |
710 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL, false }, | |
711 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL, false }, | |
53b2f3d5 WB |
712 | /* /proc/sys is used as a temporary staging directory for the read-write sysfs mount and unmounted after binding net */ |
713 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/proc/sys", "sysfs", MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL, false }, | |
cb4889ab | 714 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL, false }, |
53b2f3d5 WB |
715 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/proc/sys/devices/virtual/net", "%r/sys/devices/virtual/net", NULL, MS_BIND, NULL, false }, |
716 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/proc/sys", NULL, NULL, 0, NULL, false }, | |
5d1bf4c4 | 717 | { 0, 0, NULL, NULL, NULL, 0, NULL, false } |
b06b8511 | 718 | }; |
6d25a524 | 719 | struct lxc_conf *conf = handler->conf; |
e25af1bc CB |
720 | struct lxc_rootfs *rootfs = &conf->rootfs; |
721 | bool has_cap_net_admin; | |
368bbc02 | 722 | |
f4bea7cc | 723 | if (flags & LXC_AUTO_PROC_MASK) { |
f6c5aab0 CB |
724 | if (rootfs->path) { |
725 | /* | |
726 | * Only unmount procfs if we have a separate rootfs so | |
727 | * we can still access it in safe_mount() below. | |
728 | */ | |
729 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/proc", | |
730 | rootfs->path ? rootfs->mount : ""); | |
731 | if (ret < 0) | |
732 | return ret_errno(EIO); | |
95258e34 | 733 | |
f6c5aab0 CB |
734 | ret = umount2(rootfs->buf, MNT_DETACH); |
735 | if (ret) | |
736 | SYSDEBUG("Tried to ensure procfs is unmounted"); | |
737 | } | |
95258e34 | 738 | |
ea57e424 | 739 | ret = mkdirat(rootfs->dfd_mnt, "proc" , S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
f4bea7cc | 740 | if (ret < 0 && errno != EEXIST) |
0d33a382 | 741 | return syserror("Failed to create procfs mountpoint under %d", rootfs->dfd_mnt); |
c119f018 CB |
742 | |
743 | TRACE("Created procfs mountpoint under %d", rootfs->dfd_mnt); | |
f4bea7cc CB |
744 | } |
745 | ||
746 | if (flags & LXC_AUTO_SYS_MASK) { | |
f6c5aab0 CB |
747 | if (rootfs->path) { |
748 | /* | |
749 | * Only unmount sysfs if we have a separate rootfs so | |
750 | * we can still access it in safe_mount() below. | |
751 | */ | |
752 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/sys", | |
753 | rootfs->path ? rootfs->mount : ""); | |
754 | if (ret < 0) | |
755 | return ret_errno(EIO); | |
95258e34 | 756 | |
f6c5aab0 CB |
757 | ret = umount2(rootfs->buf, MNT_DETACH); |
758 | if (ret) | |
759 | SYSDEBUG("Tried to ensure sysfs is unmounted"); | |
760 | } | |
95258e34 | 761 | |
ea57e424 | 762 | ret = mkdirat(rootfs->dfd_mnt, "sys" , S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
f4bea7cc | 763 | if (ret < 0 && errno != EEXIST) |
0d33a382 | 764 | return syserror("Failed to create sysfs mountpoint under %d", rootfs->dfd_mnt); |
c119f018 CB |
765 | |
766 | TRACE("Created sysfs mountpoint under %d", rootfs->dfd_mnt); | |
f4bea7cc CB |
767 | } |
768 | ||
e25af1bc | 769 | has_cap_net_admin = lxc_wants_cap(CAP_NET_ADMIN, conf); |
d84b26bc | 770 | for (i = 0; default_mounts[i].match_mask; i++) { |
8db92302 | 771 | __do_free char *destination = NULL, *source = NULL; |
cb4889ab | 772 | unsigned long mflags = default_mounts[i].flags; |
96f306e6 | 773 | |
0fd73091 CB |
774 | if ((flags & default_mounts[i].match_mask) != default_mounts[i].match_flag) |
775 | continue; | |
776 | ||
777 | if (default_mounts[i].source) { | |
cc4fd506 | 778 | /* will act like strdup if %r is not present */ |
e25af1bc | 779 | source = lxc_string_replace("%r", rootfs->path ? rootfs->mount : "", default_mounts[i].source); |
0fd73091 | 780 | if (!source) |
75fca1ac | 781 | return syserror_set(-ENOMEM, "Failed to create source path"); |
0fd73091 | 782 | } |
f24a52d5 | 783 | |
e8b9c9ec | 784 | if (!has_cap_net_admin && default_mounts[i].requires_cap_net_admin) { |
785 | TRACE("Container does not have CAP_NET_ADMIN. Skipping \"%s\" mount", default_mounts[i].source ?: "(null)"); | |
786 | continue; | |
787 | } | |
788 | ||
53b2f3d5 WB |
789 | if (!default_mounts[i].destination) { |
790 | ret = umount2(source, MNT_DETACH); | |
791 | if (ret < 0) | |
792 | return log_error_errno(-1, errno, | |
793 | "Failed to unmount \"%s\"", | |
794 | source); | |
795 | TRACE("Unmounted automount \"%s\"", source); | |
796 | continue; | |
797 | } | |
798 | ||
0fd73091 | 799 | /* will act like strdup if %r is not present */ |
e25af1bc | 800 | destination = lxc_string_replace("%r", rootfs->path ? rootfs->mount : "", default_mounts[i].destination); |
55022530 | 801 | if (!destination) |
75fca1ac | 802 | return syserror_set(-ENOMEM, "Failed to create target path"); |
0fd73091 | 803 | |
cb4889ab CB |
804 | ret = safe_mount(source, destination, |
805 | default_mounts[i].fstype, | |
806 | mflags, | |
807 | default_mounts[i].options, | |
75fca1ac | 808 | rootfs->path ? rootfs->mount : NULL); |
7b371c1e | 809 | if (ret < 0) { |
75fca1ac CB |
810 | if (errno != ENOENT) |
811 | return syserror("Failed to mount \"%s\" on \"%s\" with flags %lu", source, destination, mflags); | |
812 | ||
813 | INFO("Mount source or target for \"%s\" on \"%s\" does not exist. Skipping", source, destination); | |
814 | continue; | |
368bbc02 | 815 | } |
cb4889ab CB |
816 | |
817 | if (mflags & MS_REMOUNT) | |
818 | TRACE("Remounted automount \"%s\" on \"%s\" %s with flags %lu", source, destination, (mflags & MS_RDONLY) ? "read-only" : "read-write", mflags); | |
819 | else | |
820 | TRACE("Mounted automount \"%s\" on \"%s\" %s with flags %lu", source, destination, (mflags & MS_RDONLY) ? "read-only" : "read-write", mflags); | |
368bbc02 CS |
821 | } |
822 | ||
b06b8511 | 823 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
824 | int cg_flags; |
825 | ||
3f69fb12 | 826 | cg_flags = flags & (LXC_AUTO_CGROUP_MASK & ~LXC_AUTO_CGROUP_FORCE); |
0fd73091 CB |
827 | /* If the type of cgroup mount was not specified, it depends on |
828 | * the container's capabilities as to what makes sense: if we | |
829 | * have CAP_SYS_ADMIN, the read-only part can be remounted | |
830 | * read-write anyway, so we may as well default to read-write; | |
831 | * then the admin will not be given a false sense of security. | |
832 | * (And if they really want mixed r/o r/w, then they can | |
833 | * explicitly specify :mixed.) OTOH, if the container lacks | |
834 | * CAP_SYS_ADMIN, do only default to :mixed, because then the | |
835 | * container can't remount it read-write. | |
836 | */ | |
9394b6dc | 837 | if ((cg_flags == LXC_AUTO_CGROUP_NOSPEC) || (cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC)) { |
b0ee5983 | 838 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) |
20ab7578 CB |
839 | cg_flags = has_cap(CAP_SYS_ADMIN, conf) |
840 | ? LXC_AUTO_CGROUP_RW | |
841 | : LXC_AUTO_CGROUP_MIXED; | |
b0ee5983 | 842 | else |
20ab7578 CB |
843 | cg_flags = has_cap(CAP_SYS_ADMIN, conf) |
844 | ? LXC_AUTO_CGROUP_FULL_RW | |
845 | : LXC_AUTO_CGROUP_FULL_MIXED; | |
0769b82a | 846 | } |
0fd73091 | 847 | |
3f69fb12 | 848 | if (flags & LXC_AUTO_CGROUP_FORCE) |
0fd73091 CB |
849 | cg_flags |= LXC_AUTO_CGROUP_FORCE; |
850 | ||
ab8cd5d9 | 851 | if (!handler->cgroup_ops->mount(handler->cgroup_ops, handler, cg_flags)) |
55022530 | 852 | return log_error_errno(-1, errno, "Failed to mount \"/sys/fs/cgroup\""); |
368bbc02 CS |
853 | } |
854 | ||
0d190408 | 855 | if (flags & LXC_AUTO_SHMOUNTS_MASK) { |
7b371c1e | 856 | ret = add_shmount_to_list(conf); |
55022530 CB |
857 | if (ret < 0) |
858 | return log_error(-1, "Failed to add shmount entry to container config"); | |
0d190408 LT |
859 | } |
860 | ||
368bbc02 | 861 | return 0; |
368bbc02 CS |
862 | } |
863 | ||
4e5440c6 | 864 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 865 | { |
0fd73091 CB |
866 | int ret; |
867 | ||
4e5440c6 DL |
868 | if (!utsname) |
869 | return 0; | |
0ad19a3f | 870 | |
0fd73091 | 871 | ret = sethostname(utsname->nodename, strlen(utsname->nodename)); |
55022530 CB |
872 | if (ret < 0) |
873 | return log_error_errno(-1, errno, "Failed to set the hostname to \"%s\"", | |
874 | utsname->nodename); | |
0ad19a3f | 875 | |
0fd73091 | 876 | INFO("Set hostname to \"%s\"", utsname->nodename); |
cd54d859 | 877 | |
0ad19a3f | 878 | return 0; |
879 | } | |
880 | ||
69aa6655 DE |
881 | struct dev_symlinks { |
882 | const char *oldpath; | |
883 | const char *name; | |
884 | }; | |
885 | ||
886 | static const struct dev_symlinks dev_symlinks[] = { | |
0fd73091 CB |
887 | { "/proc/self/fd", "fd" }, |
888 | { "/proc/self/fd/0", "stdin" }, | |
889 | { "/proc/self/fd/1", "stdout" }, | |
890 | { "/proc/self/fd/2", "stderr" }, | |
69aa6655 DE |
891 | }; |
892 | ||
ed8704d0 | 893 | static int lxc_setup_dev_symlinks(const struct lxc_rootfs *rootfs) |
69aa6655 | 894 | { |
1e03cbb1 | 895 | for (size_t i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { |
79019997 CB |
896 | int ret; |
897 | struct stat s; | |
69aa6655 | 898 | const struct dev_symlinks *d = &dev_symlinks[i]; |
0fd73091 | 899 | |
79019997 CB |
900 | /* |
901 | * Stat the path first. If we don't get an error accept it as | |
0fd73091 | 902 | * is and don't try to create it |
09227be2 | 903 | */ |
a5a08920 | 904 | ret = fstatat(rootfs->dfd_dev, d->name, &s, 0); |
0fd73091 | 905 | if (ret == 0) |
09227be2 | 906 | continue; |
09227be2 | 907 | |
a5a08920 | 908 | ret = symlinkat(d->oldpath, rootfs->dfd_dev, d->name); |
79019997 CB |
909 | if (ret) { |
910 | switch (errno) { | |
911 | case EROFS: | |
912 | WARN("Failed to create \"%s\" on read-only filesystem", d->name); | |
913 | __fallthrough; | |
914 | case EEXIST: | |
915 | break; | |
916 | default: | |
917 | return log_error_errno(-errno, errno, "Failed to create \"%s\"", d->name); | |
918 | } | |
69aa6655 DE |
919 | } |
920 | } | |
0fd73091 | 921 | |
69aa6655 DE |
922 | return 0; |
923 | } | |
924 | ||
2187efd3 | 925 | /* Build a space-separate list of ptys to pass to systemd. */ |
eae44ce1 | 926 | static bool append_ttyname(struct lxc_tty_info *ttys, char *tty_name) |
b0a33c1e | 927 | { |
eae44ce1 | 928 | char *tty_names, *buf; |
f1e05b90 | 929 | size_t size; |
393903d1 | 930 | |
eae44ce1 CB |
931 | if (!tty_name) |
932 | return false; | |
0fd73091 | 933 | |
eae44ce1 CB |
934 | size = strlen(tty_name) + 1; |
935 | if (ttys->tty_names) | |
936 | size += strlen(ttys->tty_names) + 1; | |
0fd73091 | 937 | |
eae44ce1 CB |
938 | buf = realloc(ttys->tty_names, size); |
939 | if (!buf) | |
393903d1 | 940 | return false; |
eae44ce1 | 941 | tty_names = buf; |
0fd73091 | 942 | |
eae44ce1 CB |
943 | if (ttys->tty_names) |
944 | (void)strlcat(buf, " ", size); | |
945 | else | |
946 | buf[0] = '\0'; | |
947 | (void)strlcat(buf, tty_name, size); | |
948 | ttys->tty_names = tty_names; | |
393903d1 SH |
949 | return true; |
950 | } | |
951 | ||
128655e7 PM |
952 | static int open_ttymnt_at(int dfd, const char *path) |
953 | { | |
954 | int fd; | |
955 | ||
777827cb CB |
956 | fd = open_at(dfd, path, |
957 | PROTECT_OPEN | O_CREAT | O_EXCL, | |
958 | PROTECT_LOOKUP_BENEATH, | |
959 | 0); | |
960 | if (fd < 0) { | |
4deaa28c | 961 | if (errno != ENXIO && errno != EEXIST) |
777827cb CB |
962 | return syserror("Failed to create \"%d/\%s\"", dfd, path); |
963 | ||
964 | SYSINFO("Failed to create \"%d/\%s\"", dfd, path); | |
965 | fd = open_at(dfd, path, | |
966 | PROTECT_OPATH_FILE, | |
967 | PROTECT_LOOKUP_BENEATH, | |
968 | 0); | |
969 | } | |
128655e7 PM |
970 | |
971 | return fd; | |
972 | } | |
973 | ||
2187efd3 | 974 | static int lxc_setup_ttys(struct lxc_conf *conf) |
393903d1 | 975 | { |
7369e6bf CB |
976 | int ret; |
977 | struct lxc_rootfs *rootfs = &conf->rootfs; | |
0e4be3cf | 978 | const struct lxc_tty_info *ttys = &conf->ttys; |
885766f5 | 979 | char *ttydir = ttys->dir; |
b0a33c1e | 980 | |
e8bd4e43 | 981 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
982 | return 0; |
983 | ||
1e03cbb1 | 984 | for (size_t i = 0; i < ttys->max; i++) { |
7369e6bf | 985 | __do_close int fd_to = -EBADF; |
0e4be3cf | 986 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
b0a33c1e | 987 | |
7c6ef2a2 | 988 | if (ttydir) { |
7369e6bf | 989 | char *tty_name, *tty_path; |
9e1045e3 | 990 | |
9bcde680 | 991 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), |
1e03cbb1 | 992 | "/dev/%s/tty%zu", ttydir, i + 1); |
9bcde680 | 993 | if (ret < 0) |
7369e6bf CB |
994 | return ret_errno(-EIO); |
995 | ||
996 | tty_path = &rootfs->buf[STRLITERALLEN("/dev/")]; | |
997 | tty_name = tty_path + strlen(ttydir) + 1; | |
998 | ||
999 | /* create bind-mount target */ | |
128655e7 | 1000 | fd_to = open_ttymnt_at(rootfs->dfd_dev, tty_path); |
7369e6bf CB |
1001 | if (fd_to < 0) |
1002 | return log_error_errno(-errno, errno, | |
1003 | "Failed to create tty mount target %d(%s)", | |
1004 | rootfs->dfd_dev, tty_path); | |
1005 | ||
1006 | ret = unlinkat(rootfs->dfd_dev, tty_name, 0); | |
1007 | if (ret < 0 && errno != ENOENT) | |
1008 | return log_error_errno(-errno, errno, | |
1009 | "Failed to unlink %d(%s)", | |
1010 | rootfs->dfd_dev, tty_name); | |
1011 | ||
84f8f9e4 | 1012 | if (can_use_mount_api()) |
7369e6bf CB |
1013 | ret = fd_bind_mount(tty->pty, "", |
1014 | PROTECT_OPATH_FILE, | |
1015 | PROTECT_LOOKUP_BENEATH_XDEV, | |
1016 | fd_to, "", | |
1017 | PROTECT_OPATH_FILE, | |
704cadd5 CB |
1018 | PROTECT_LOOKUP_BENEATH_XDEV, |
1019 | 0, | |
1020 | 0, | |
1021 | 0, | |
7369e6bf | 1022 | false); |
84f8f9e4 CB |
1023 | else |
1024 | ret = mount_fd(tty->pty, fd_to, "none", MS_BIND, 0); | |
7369e6bf CB |
1025 | if (ret < 0) |
1026 | return log_error_errno(-errno, errno, | |
1027 | "Failed to bind mount \"%s\" onto \"%s\"", | |
1028 | tty->name, rootfs->buf); | |
1029 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, rootfs->buf); | |
9e1045e3 | 1030 | |
7369e6bf | 1031 | ret = symlinkat(tty_path, rootfs->dfd_dev, tty_name); |
55022530 | 1032 | if (ret < 0) |
7369e6bf CB |
1033 | return log_error_errno(-errno, errno, |
1034 | "Failed to create symlink \"%d(%s)\" -> \"%d(%s)\"", | |
1035 | rootfs->dfd_dev, tty_name, | |
1036 | rootfs->dfd_dev, tty_path); | |
7c6ef2a2 | 1037 | } else { |
1e03cbb1 | 1038 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "tty%zu", i + 1); |
9bcde680 | 1039 | if (ret < 0) |
7369e6bf CB |
1040 | return ret_errno(-EIO); |
1041 | ||
1042 | /* If we populated /dev, then we need to create /dev/tty<idx>. */ | |
128655e7 | 1043 | fd_to = open_ttymnt_at(rootfs->dfd_dev, rootfs->buf); |
7369e6bf CB |
1044 | if (fd_to < 0) |
1045 | return log_error_errno(-errno, errno, | |
1046 | "Failed to create tty mount target %d(%s)", | |
1047 | rootfs->dfd_dev, rootfs->buf); | |
1048 | ||
84f8f9e4 | 1049 | if (can_use_mount_api()) |
7369e6bf CB |
1050 | ret = fd_bind_mount(tty->pty, "", |
1051 | PROTECT_OPATH_FILE, | |
1052 | PROTECT_LOOKUP_BENEATH_XDEV, | |
1053 | fd_to, "", | |
1054 | PROTECT_OPATH_FILE, | |
704cadd5 CB |
1055 | PROTECT_LOOKUP_BENEATH, |
1056 | 0, | |
1057 | 0, | |
1058 | 0, | |
7369e6bf | 1059 | false); |
84f8f9e4 CB |
1060 | else |
1061 | ret = mount_fd(tty->pty, fd_to, "none", MS_BIND, 0); | |
7369e6bf CB |
1062 | if (ret < 0) |
1063 | return log_error_errno(-errno, errno, | |
1064 | "Failed to bind mount \"%s\" onto \"%s\"", | |
1065 | tty->name, rootfs->buf); | |
1066 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, rootfs->buf); | |
393903d1 | 1067 | } |
9e1045e3 | 1068 | |
eae44ce1 | 1069 | if (!append_ttyname(&conf->ttys, tty->name)) |
55022530 | 1070 | return log_error(-1, "Error setting up container_ttys string"); |
b0a33c1e | 1071 | } |
1072 | ||
885766f5 | 1073 | INFO("Finished setting up %zu /dev/tty<N> device(s)", ttys->max); |
b0a33c1e | 1074 | return 0; |
1075 | } | |
1076 | ||
9d0e129b CB |
1077 | define_cleanup_function(struct lxc_tty_info *, lxc_delete_tty); |
1078 | ||
59eac805 | 1079 | static int lxc_allocate_ttys(struct lxc_conf *conf) |
2187efd3 | 1080 | { |
9d0e129b | 1081 | call_cleaner(lxc_delete_tty) struct lxc_tty_info *ttys = &conf->ttys; |
fca23691 | 1082 | int ret; |
2187efd3 CB |
1083 | |
1084 | /* no tty in the configuration */ | |
885766f5 | 1085 | if (ttys->max == 0) |
2187efd3 CB |
1086 | return 0; |
1087 | ||
9d0e129b CB |
1088 | ttys->tty = zalloc(sizeof(struct lxc_terminal_info) * ttys->max); |
1089 | if (!ttys->tty) | |
2187efd3 | 1090 | return -ENOMEM; |
2187efd3 | 1091 | |
7369e6bf | 1092 | for (size_t i = 0; i < conf->ttys.max; i++) { |
9d0e129b | 1093 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1094 | |
4dcf0c43 | 1095 | ret = lxc_devpts_terminal(conf->devpts_fd, &tty->ptx, |
3b9f84fd | 1096 | &tty->pty, &tty->pty_nr, false); |
77a39805 | 1097 | if (ret < 0) { |
7369e6bf | 1098 | conf->ttys.max = i; |
6a2ca1b4 | 1099 | return syserror_set(-ENOTTY, "Failed to create tty %zu", i); |
2187efd3 | 1100 | } |
3b9f84fd CB |
1101 | ret = strnprintf(tty->name, sizeof(tty->name), "pts/%d", tty->pty_nr); |
1102 | if (ret < 0) | |
1103 | return syserror("Failed to create tty %zu", i); | |
1104 | ||
d926c261 | 1105 | DEBUG("Created tty with ptx fd %d and pty fd %d and index %d", |
3b9f84fd | 1106 | tty->ptx, tty->pty, tty->pty_nr); |
7581d645 | 1107 | tty->busy = -1; |
2187efd3 CB |
1108 | } |
1109 | ||
885766f5 | 1110 | INFO("Finished creating %zu tty devices", ttys->max); |
9d0e129b | 1111 | move_ptr(ttys); |
2187efd3 CB |
1112 | return 0; |
1113 | } | |
1114 | ||
0e4be3cf | 1115 | void lxc_delete_tty(struct lxc_tty_info *ttys) |
2187efd3 | 1116 | { |
b35f8f7e | 1117 | if (!ttys || !ttys->tty) |
386e6768 CB |
1118 | return; |
1119 | ||
1e03cbb1 | 1120 | for (size_t i = 0; i < ttys->max; i++) { |
0e4be3cf | 1121 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
36a94ce8 | 1122 | close_prot_errno_disarm(tty->ptx); |
41808e20 | 1123 | close_prot_errno_disarm(tty->pty); |
2187efd3 CB |
1124 | } |
1125 | ||
55022530 | 1126 | free_disarm(ttys->tty); |
2187efd3 CB |
1127 | } |
1128 | ||
1b82d721 | 1129 | static int __lxc_send_ttys_to_parent(struct lxc_handler *handler) |
2187efd3 | 1130 | { |
0fd73091 | 1131 | int ret = -1; |
2187efd3 | 1132 | struct lxc_conf *conf = handler->conf; |
0e4be3cf | 1133 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 | 1134 | int sock = handler->data_sock[0]; |
2187efd3 | 1135 | |
885766f5 | 1136 | if (ttys->max == 0) |
2187efd3 CB |
1137 | return 0; |
1138 | ||
1e03cbb1 | 1139 | for (size_t i = 0; i < ttys->max; i++) { |
2187efd3 | 1140 | int ttyfds[2]; |
0e4be3cf | 1141 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1142 | |
36a94ce8 | 1143 | ttyfds[0] = tty->ptx; |
41808e20 | 1144 | ttyfds[1] = tty->pty; |
2187efd3 CB |
1145 | |
1146 | ret = lxc_abstract_unix_send_fds(sock, ttyfds, 2, NULL, 0); | |
1147 | if (ret < 0) | |
1148 | break; | |
1149 | ||
41808e20 CB |
1150 | TRACE("Sent tty \"%s\" with ptx fd %d and pty fd %d to parent", |
1151 | tty->name, tty->ptx, tty->pty); | |
2187efd3 CB |
1152 | } |
1153 | ||
1154 | if (ret < 0) | |
6d1400b5 | 1155 | SYSERROR("Failed to send %zu ttys to parent", ttys->max); |
2187efd3 | 1156 | else |
885766f5 | 1157 | TRACE("Sent %zu ttys to parent", ttys->max); |
2187efd3 CB |
1158 | |
1159 | return ret; | |
1160 | } | |
1161 | ||
1162 | static int lxc_create_ttys(struct lxc_handler *handler) | |
1163 | { | |
1164 | int ret = -1; | |
1165 | struct lxc_conf *conf = handler->conf; | |
1166 | ||
663014ee | 1167 | ret = lxc_allocate_ttys(conf); |
2187efd3 CB |
1168 | if (ret < 0) { |
1169 | ERROR("Failed to allocate ttys"); | |
1170 | goto on_error; | |
1171 | } | |
1172 | ||
2187efd3 CB |
1173 | if (!conf->is_execute) { |
1174 | ret = lxc_setup_ttys(conf); | |
1175 | if (ret < 0) { | |
1176 | ERROR("Failed to setup ttys"); | |
1177 | goto on_error; | |
1178 | } | |
1179 | } | |
1180 | ||
885766f5 CB |
1181 | if (conf->ttys.tty_names) { |
1182 | ret = setenv("container_ttys", conf->ttys.tty_names, 1); | |
1b82d721 | 1183 | if (ret < 0) { |
885766f5 | 1184 | SYSERROR("Failed to set \"container_ttys=%s\"", conf->ttys.tty_names); |
1b82d721 CB |
1185 | goto on_error; |
1186 | } | |
3b9f84fd | 1187 | TRACE("Set \"container_ttys=%s\"", conf->ttys.tty_names); |
2187efd3 CB |
1188 | } |
1189 | ||
1b82d721 | 1190 | return 0; |
2187efd3 CB |
1191 | |
1192 | on_error: | |
0e4be3cf | 1193 | lxc_delete_tty(&conf->ttys); |
2187efd3 | 1194 | |
1b82d721 CB |
1195 | return -1; |
1196 | } | |
1197 | ||
111ed96e | 1198 | static int lxc_send_ttys_to_parent(struct lxc_handler *handler) |
1b82d721 CB |
1199 | { |
1200 | int ret = -1; | |
1201 | ||
1202 | ret = __lxc_send_ttys_to_parent(handler); | |
1203 | lxc_delete_tty(&handler->conf->ttys); | |
2187efd3 CB |
1204 | return ret; |
1205 | } | |
1206 | ||
7133b912 CB |
1207 | /* Just create a path for /dev under $lxcpath/$name and in rootfs If we hit an |
1208 | * error, log it but don't fail yet. | |
91c3830e | 1209 | */ |
7133b912 | 1210 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, |
63012bdd | 1211 | int autodevtmpfssize, const char *lxcpath) |
91c3830e | 1212 | { |
bfbfeedf | 1213 | __do_close int fd_fs = -EBADF; |
ee8eeba8 | 1214 | const char *path = rootfs->path ? rootfs->mount : NULL; |
bfbfeedf | 1215 | size_t tmpfs_size = (autodevtmpfssize != 0) ? autodevtmpfssize : 500000; |
91c3830e | 1216 | int ret; |
87e0e273 | 1217 | mode_t cur_mask; |
63012bdd | 1218 | char mount_options[128]; |
91c3830e | 1219 | |
7133b912 | 1220 | INFO("Preparing \"/dev\""); |
bc6928ff | 1221 | |
87e0e273 | 1222 | cur_mask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
ea57e424 | 1223 | ret = mkdirat(rootfs->dfd_mnt, "dev" , S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
87e0e273 CB |
1224 | if (ret < 0 && errno != EEXIST) { |
1225 | SYSERROR("Failed to create \"/dev\" directory"); | |
1226 | ret = -errno; | |
1227 | goto reset_umask; | |
bc6928ff | 1228 | } |
87da4ec3 | 1229 | |
de7f9f33 | 1230 | if (can_use_mount_api()) { |
635e7bac CB |
1231 | fd_fs = fs_prepare("tmpfs", -EBADF, "", 0, 0); |
1232 | if (fd_fs < 0) | |
1233 | return log_error_errno(-errno, errno, "Failed to prepare filesystem context for tmpfs"); | |
ee8eeba8 | 1234 | |
bfbfeedf CB |
1235 | sprintf(mount_options, "%zu", tmpfs_size); |
1236 | ||
1237 | ret = fs_set_property(fd_fs, "mode", "0755"); | |
1238 | if (ret < 0) | |
1239 | return log_error_errno(-errno, errno, "Failed to mount tmpfs onto %d(dev)", fd_fs); | |
1240 | ||
1241 | ret = fs_set_property(fd_fs, "size", mount_options); | |
1242 | if (ret < 0) | |
1243 | return log_error_errno(-errno, errno, "Failed to mount tmpfs onto %d(dev)", fd_fs); | |
1244 | ||
89606dfb CB |
1245 | ret = fs_attach(fd_fs, rootfs->dfd_mnt, "dev", |
1246 | PROTECT_OPATH_DIRECTORY, | |
1247 | PROTECT_LOOKUP_BENEATH_XDEV, 0); | |
635e7bac CB |
1248 | } else { |
1249 | __do_free char *fallback_path = NULL; | |
1250 | ||
1251 | sprintf(mount_options, "size=%zu,mode=755", tmpfs_size); | |
1252 | DEBUG("Using mount options: %s", mount_options); | |
1253 | ||
1254 | if (path) { | |
1255 | fallback_path = must_make_path(path, "/dev", NULL); | |
1256 | ret = safe_mount("none", fallback_path, "tmpfs", 0, mount_options, path); | |
1257 | } else { | |
1258 | ret = safe_mount("none", "dev", "tmpfs", 0, mount_options, NULL); | |
1259 | } | |
87e0e273 | 1260 | } |
bfbfeedf CB |
1261 | if (ret < 0) { |
1262 | SYSERROR("Failed to mount tmpfs on \"%s\"", path); | |
1263 | goto reset_umask; | |
1264 | } | |
1265 | ||
7133b912 | 1266 | /* If we are running on a devtmpfs mapping, dev/pts may already exist. |
bc6928ff MW |
1267 | * If not, then create it and exit if that fails... |
1268 | */ | |
ea57e424 | 1269 | ret = mkdirat(rootfs->dfd_mnt, "dev/pts", S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
87e0e273 | 1270 | if (ret < 0 && errno != EEXIST) { |
bfbfeedf | 1271 | SYSERROR("Failed to create directory \"dev/pts\""); |
87e0e273 CB |
1272 | ret = -errno; |
1273 | goto reset_umask; | |
91c3830e SH |
1274 | } |
1275 | ||
87e0e273 CB |
1276 | ret = 0; |
1277 | ||
1278 | reset_umask: | |
1279 | (void)umask(cur_mask); | |
1280 | ||
7133b912 | 1281 | INFO("Prepared \"/dev\""); |
87e0e273 | 1282 | return ret; |
91c3830e SH |
1283 | } |
1284 | ||
5e73416f | 1285 | struct lxc_device_node { |
74a3920a | 1286 | const char *name; |
5e73416f CB |
1287 | const mode_t mode; |
1288 | const int maj; | |
1289 | const int min; | |
c6883f38 SH |
1290 | }; |
1291 | ||
5e73416f | 1292 | static const struct lxc_device_node lxc_devices[] = { |
06749971 | 1293 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, |
5e73416f | 1294 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
06749971 CB |
1295 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, |
1296 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
5e73416f CB |
1297 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, |
1298 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
c6883f38 SH |
1299 | }; |
1300 | ||
5067e4dd CB |
1301 | |
1302 | enum { | |
1303 | LXC_DEVNODE_BIND, | |
1304 | LXC_DEVNODE_MKNOD, | |
1305 | LXC_DEVNODE_PARTIAL, | |
1306 | LXC_DEVNODE_OPEN, | |
1307 | }; | |
1308 | ||
887ae844 | 1309 | static int lxc_fill_autodev(struct lxc_rootfs *rootfs) |
c6883f38 | 1310 | { |
1e03cbb1 | 1311 | int ret; |
3a32201c | 1312 | mode_t cmask; |
5067e4dd | 1313 | int use_mknod = LXC_DEVNODE_MKNOD; |
c6883f38 | 1314 | |
a5a08920 | 1315 | if (rootfs->dfd_dev < 0) |
81498328 | 1316 | return log_info(0, "No /dev directory found, skipping setup"); |
d43d5191 | 1317 | |
3999be0a CB |
1318 | INFO("Populating \"/dev\""); |
1319 | ||
3a32201c | 1320 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
1e03cbb1 | 1321 | for (size_t i = 0; i < sizeof(lxc_devices) / sizeof(lxc_devices[0]); i++) { |
5e73416f | 1322 | const struct lxc_device_node *device = &lxc_devices[i]; |
0728ebf4 | 1323 | |
5067e4dd | 1324 | if (use_mknod >= LXC_DEVNODE_MKNOD) { |
a5a08920 | 1325 | ret = mknodat(rootfs->dfd_dev, device->name, device->mode, makedev(device->maj, device->min)); |
5e73416f | 1326 | if (ret == 0 || (ret < 0 && errno == EEXIST)) { |
d43d5191 | 1327 | DEBUG("Created device node \"%s\"", device->name); |
5067e4dd | 1328 | } else if (ret < 0) { |
55022530 | 1329 | if (errno != EPERM) |
d43d5191 | 1330 | return log_error_errno(-1, errno, "Failed to create device node \"%s\"", device->name); |
0bbf8572 | 1331 | |
5067e4dd | 1332 | use_mknod = LXC_DEVNODE_BIND; |
9cb4d183 | 1333 | } |
3999be0a | 1334 | |
5067e4dd CB |
1335 | /* Device nodes are fully useable. */ |
1336 | if (use_mknod == LXC_DEVNODE_OPEN) | |
1337 | continue; | |
1338 | ||
1339 | if (use_mknod == LXC_DEVNODE_MKNOD) { | |
d43d5191 | 1340 | __do_close int fd = -EBADF; |
5067e4dd CB |
1341 | /* See |
1342 | * - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=55956b59df336f6738da916dbb520b6e37df9fbd | |
1343 | * - https://lists.linuxfoundation.org/pipermail/containers/2018-June/039176.html | |
1344 | */ | |
a5a08920 | 1345 | fd = open_at(rootfs->dfd_dev, device->name, PROTECT_OPEN, PROTECT_LOOKUP_BENEATH, 0); |
d43d5191 | 1346 | if (fd >= 0) { |
5067e4dd CB |
1347 | /* Device nodes are fully useable. */ |
1348 | use_mknod = LXC_DEVNODE_OPEN; | |
1349 | continue; | |
1350 | } | |
1351 | ||
d43d5191 | 1352 | SYSTRACE("Failed to open \"%s\" device", device->name); |
5067e4dd CB |
1353 | /* Device nodes are only partially useable. */ |
1354 | use_mknod = LXC_DEVNODE_PARTIAL; | |
1355 | } | |
5e73416f CB |
1356 | } |
1357 | ||
5067e4dd CB |
1358 | if (use_mknod != LXC_DEVNODE_PARTIAL) { |
1359 | /* If we are dealing with partially functional device | |
1360 | * nodes the prio mknod() call will have created the | |
1361 | * device node so we can use it as a bind-mount target. | |
1362 | */ | |
a5a08920 | 1363 | ret = mknodat(rootfs->dfd_dev, device->name, S_IFREG | 0000, 0); |
55022530 | 1364 | if (ret < 0 && errno != EEXIST) |
d43d5191 | 1365 | return log_error_errno(-1, errno, "Failed to create file \"%s\"", device->name); |
5e73416f CB |
1366 | } |
1367 | ||
1368 | /* Fallback to bind-mounting the device from the host. */ | |
9bcde680 CB |
1369 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "dev/%s", device->name); |
1370 | if (ret < 0) | |
b41ff502 | 1371 | return ret_errno(EIO); |
5e73416f | 1372 | |
de7f9f33 | 1373 | if (can_use_mount_api()) { |
887ae844 | 1374 | ret = fd_bind_mount(rootfs->dfd_host, rootfs->buf, |
635e7bac CB |
1375 | PROTECT_OPATH_FILE, |
1376 | PROTECT_LOOKUP_BENEATH_XDEV, | |
1377 | rootfs->dfd_dev, device->name, | |
1378 | PROTECT_OPATH_FILE, | |
704cadd5 CB |
1379 | PROTECT_LOOKUP_BENEATH, |
1380 | 0, | |
1381 | 0, | |
1382 | 0, | |
1383 | false); | |
635e7bac | 1384 | } else { |
927ea337 CB |
1385 | char path[PATH_MAX]; |
1386 | ||
9bcde680 CB |
1387 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "/dev/%s", device->name); |
1388 | if (ret < 0) | |
927ea337 CB |
1389 | return ret_errno(EIO); |
1390 | ||
9bcde680 CB |
1391 | ret = strnprintf(path, sizeof(path), "%s/dev/%s", get_rootfs_mnt(rootfs), device->name); |
1392 | if (ret < 0) | |
927ea337 CB |
1393 | return log_error(-1, "Failed to create device path for %s", device->name); |
1394 | ||
887ae844 | 1395 | ret = safe_mount(rootfs->buf, path, 0, MS_BIND, NULL, get_rootfs_mnt(rootfs)); |
927ea337 | 1396 | if (ret < 0) |
887ae844 | 1397 | return log_error_errno(-1, errno, "Failed to bind mount host device node \"%s\" to \"%s\"", rootfs->buf, path); |
927ea337 | 1398 | |
887ae844 | 1399 | DEBUG("Bind mounted host device node \"%s\" to \"%s\"", rootfs->buf, path); |
927ea337 | 1400 | continue; |
d43d5191 | 1401 | } |
887ae844 | 1402 | DEBUG("Bind mounted host device %d(%s) to %d(%s)", rootfs->dfd_host, rootfs->buf, rootfs->dfd_dev, device->name); |
c6883f38 | 1403 | } |
5e73416f | 1404 | (void)umask(cmask); |
c6883f38 | 1405 | |
3999be0a | 1406 | INFO("Populated \"/dev\""); |
c6883f38 SH |
1407 | return 0; |
1408 | } | |
1409 | ||
4e86cad3 | 1410 | static int lxc_mount_rootfs(struct lxc_rootfs *rootfs) |
0ad19a3f | 1411 | { |
9aa76a17 | 1412 | int ret; |
cc28d0b0 | 1413 | |
a0f379bf | 1414 | if (!rootfs->path) { |
0fd73091 | 1415 | ret = mount("", "/", NULL, MS_SLAVE | MS_REC, 0); |
55022530 | 1416 | if (ret < 0) |
9e61fb1f | 1417 | return log_error_errno(-1, errno, "Failed to recursively turn root mount tree into dependent mount"); |
0fd73091 | 1418 | |
ea57e424 CB |
1419 | rootfs->dfd_mnt = open_at(-EBADF, "/", PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_ABSOLUTE, 0); |
1420 | if (rootfs->dfd_mnt < 0) | |
31f8b2fd CB |
1421 | return -errno; |
1422 | ||
c119f018 | 1423 | return log_trace(0, "Container doesn't use separate rootfs. Opened host's rootfs"); |
a0f379bf | 1424 | } |
0ad19a3f | 1425 | |
0fd73091 | 1426 | ret = access(rootfs->mount, F_OK); |
55022530 CB |
1427 | if (ret != 0) |
1428 | return log_error_errno(-1, errno, "Failed to access to \"%s\". Check it is present", | |
1429 | rootfs->mount); | |
b1789442 | 1430 | |
4e86cad3 | 1431 | ret = rootfs->storage->ops->mount(rootfs->storage); |
55022530 CB |
1432 | if (ret < 0) |
1433 | return log_error(-1, "Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", | |
1434 | rootfs->path, rootfs->mount, | |
e73af35b | 1435 | rootfs->mnt_opts.raw_options ? rootfs->mnt_opts.raw_options : "(null)"); |
0ad19a3f | 1436 | |
0fd73091 | 1437 | DEBUG("Mounted rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 | 1438 | rootfs->path, rootfs->mount, |
e73af35b | 1439 | rootfs->mnt_opts.raw_options ? rootfs->mnt_opts.raw_options : "(null)"); |
9aa76a17 | 1440 | |
ea57e424 CB |
1441 | rootfs->dfd_mnt = open_at(-EBADF, rootfs->mount, PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_ABSOLUTE_XDEV, 0); |
1442 | if (rootfs->dfd_mnt < 0) | |
31f8b2fd CB |
1443 | return -errno; |
1444 | ||
c119f018 | 1445 | return log_trace(0, "Container uses separate rootfs. Opened container's rootfs"); |
ac778708 DL |
1446 | } |
1447 | ||
4f2af104 CB |
1448 | static bool lxc_rootfs_overmounted(struct lxc_rootfs *rootfs) |
1449 | { | |
1450 | __do_close int fd_rootfs = -EBADF; | |
1451 | ||
1452 | if (!rootfs->path) | |
1453 | fd_rootfs = open_at(-EBADF, "/", PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_ABSOLUTE, 0); | |
1454 | else | |
1455 | fd_rootfs = open_at(-EBADF, rootfs->mount, PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_ABSOLUTE_XDEV, 0); | |
1456 | if (fd_rootfs < 0) | |
1457 | return true; | |
1458 | ||
1459 | if (!same_file_lax(rootfs->dfd_mnt, fd_rootfs)) | |
1460 | return syswarn_ret(true, "Rootfs seems to have changed after setting up mounts"); | |
1461 | ||
1462 | return false; | |
1463 | } | |
1464 | ||
59eac805 | 1465 | static int lxc_chroot(const struct lxc_rootfs *rootfs) |
91e93c71 | 1466 | { |
b8d88764 | 1467 | __do_free char *nroot = NULL; |
0fd73091 | 1468 | int i, ret; |
8ce1abc2 | 1469 | char *root = rootfs->mount; |
91e93c71 | 1470 | |
74e7b662 | 1471 | nroot = realpath(root, NULL); |
55022530 CB |
1472 | if (!nroot) |
1473 | return log_error_errno(-1, errno, "Failed to resolve \"%s\"", root); | |
91e93c71 | 1474 | |
0fd73091 | 1475 | ret = chdir("/"); |
b8d88764 | 1476 | if (ret < 0) |
0fd73091 | 1477 | return -1; |
91e93c71 | 1478 | |
0fd73091 CB |
1479 | /* We could use here MS_MOVE, but in userns this mount is locked and |
1480 | * can't be moved. | |
91e93c71 | 1481 | */ |
8ce1abc2 | 1482 | ret = mount(nroot, "/", NULL, MS_REC | MS_BIND, NULL); |
55022530 CB |
1483 | if (ret < 0) |
1484 | return log_error_errno(-1, errno, "Failed to mount \"%s\" onto \"/\" as MS_REC | MS_BIND", nroot); | |
91e93c71 | 1485 | |
0fd73091 | 1486 | ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL); |
55022530 CB |
1487 | if (ret < 0) |
1488 | return log_error_errno(-1, errno, "Failed to remount \"/\""); | |
91e93c71 | 1489 | |
aa899945 | 1490 | /* The following code cleans up inherited mounts which are not required |
0fd73091 | 1491 | * for CT. |
91e93c71 AV |
1492 | * |
1493 | * The mountinfo file shows not all mounts, if a few points have been | |
1494 | * unmounted between read operations from the mountinfo. So we need to | |
1495 | * read mountinfo a few times. | |
1496 | * | |
7ded5fa7 | 1497 | * This loop can be skipped if a container uses userns, because all |
91e93c71 AV |
1498 | * inherited mounts are locked and we should live with all this trash. |
1499 | */ | |
0fd73091 | 1500 | for (;;) { |
4fdd1f72 | 1501 | __do_fclose FILE *f = NULL; |
f3d38164 CB |
1502 | __do_free char *line = NULL; |
1503 | char *slider1, *slider2; | |
91e93c71 | 1504 | int progress = 0; |
f3d38164 | 1505 | size_t len = 0; |
91e93c71 | 1506 | |
4110345b | 1507 | f = fopen("./proc/self/mountinfo", "re"); |
55022530 CB |
1508 | if (!f) |
1509 | return log_error_errno(-1, errno, "Failed to open \"/proc/self/mountinfo\""); | |
0fd73091 | 1510 | |
f3d38164 CB |
1511 | while (getline(&line, &len, f) > 0) { |
1512 | for (slider1 = line, i = 0; slider1 && i < 4; i++) | |
1513 | slider1 = strchr(slider1 + 1, ' '); | |
0fd73091 | 1514 | |
f3d38164 | 1515 | if (!slider1) |
91e93c71 | 1516 | continue; |
0fd73091 | 1517 | |
f3d38164 CB |
1518 | slider2 = strchr(slider1 + 1, ' '); |
1519 | if (!slider2) | |
91e93c71 AV |
1520 | continue; |
1521 | ||
f3d38164 CB |
1522 | *slider2 = '\0'; |
1523 | *slider1 = '.'; | |
91e93c71 | 1524 | |
71528742 | 1525 | if (strequal(slider1 + 1, "/")) |
91e93c71 | 1526 | continue; |
0fd73091 | 1527 | |
71528742 | 1528 | if (strequal(slider1 + 1, "/proc")) |
91e93c71 AV |
1529 | continue; |
1530 | ||
f3d38164 | 1531 | ret = umount2(slider1, MNT_DETACH); |
0fd73091 | 1532 | if (ret == 0) |
91e93c71 AV |
1533 | progress++; |
1534 | } | |
0fd73091 | 1535 | |
91e93c71 AV |
1536 | if (!progress) |
1537 | break; | |
1538 | } | |
1539 | ||
7ded5fa7 | 1540 | /* This also can be skipped if a container uses userns. */ |
0fd73091 | 1541 | (void)umount2("./proc", MNT_DETACH); |
91e93c71 AV |
1542 | |
1543 | /* It is weird, but chdir("..") moves us in a new root */ | |
0fd73091 | 1544 | ret = chdir(".."); |
55022530 CB |
1545 | if (ret < 0) |
1546 | return log_error_errno(-1, errno, "Failed to chdir(\"..\")"); | |
91e93c71 | 1547 | |
0fd73091 | 1548 | ret = chroot("."); |
55022530 CB |
1549 | if (ret < 0) |
1550 | return log_error_errno(-1, errno, "Failed to chroot(\".\")"); | |
91e93c71 AV |
1551 | |
1552 | return 0; | |
1553 | } | |
1554 | ||
8ce1abc2 CB |
1555 | /* (The following explanation is copied verbatim from the kernel.) |
1556 | * | |
1557 | * pivot_root Semantics: | |
1558 | * Moves the root file system of the current process to the directory put_old, | |
1559 | * makes new_root as the new root file system of the current process, and sets | |
1560 | * root/cwd of all processes which had them on the current root to new_root. | |
1561 | * | |
1562 | * Restrictions: | |
1563 | * The new_root and put_old must be directories, and must not be on the | |
1564 | * same file system as the current process root. The put_old must be | |
1565 | * underneath new_root, i.e. adding a non-zero number of /.. to the string | |
1566 | * pointed to by put_old must yield the same directory as new_root. No other | |
1567 | * file system may be mounted on put_old. After all, new_root is a mountpoint. | |
1568 | * | |
1569 | * Also, the current root cannot be on the 'rootfs' (initial ramfs) filesystem. | |
1570 | * See Documentation/filesystems/ramfs-rootfs-initramfs.txt for alternatives | |
1571 | * in this situation. | |
1572 | * | |
1573 | * Notes: | |
1574 | * - we don't move root/cwd if they are not at the root (reason: if something | |
1575 | * cared enough to change them, it's probably wrong to force them elsewhere) | |
1576 | * - it's okay to pick a root that isn't the root of a file system, e.g. | |
1577 | * /nfs/my_root where /nfs is the mount point. It must be a mountpoint, | |
1578 | * though, so you may need to say mount --bind /nfs/my_root /nfs/my_root | |
1579 | * first. | |
1580 | */ | |
7f50ec8b | 1581 | static int lxc_pivot_root(const struct lxc_rootfs *rootfs) |
ac778708 | 1582 | { |
7f50ec8b | 1583 | __do_close int fd_oldroot = -EBADF; |
b0d7aac4 | 1584 | int ret; |
0fd73091 | 1585 | |
7f50ec8b CB |
1586 | fd_oldroot = open_at(-EBADF, "/", PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_ABSOLUTE, 0); |
1587 | if (fd_oldroot < 0) | |
55022530 | 1588 | return log_error_errno(-1, errno, "Failed to open old root directory"); |
ac778708 | 1589 | |
8ce1abc2 | 1590 | /* change into new root fs */ |
ea57e424 | 1591 | ret = fchdir(rootfs->dfd_mnt); |
55022530 | 1592 | if (ret < 0) |
7f50ec8b | 1593 | return log_error_errno(-errno, errno, "Failed to change into new root directory \"%s\"", rootfs->mount); |
39c7b795 | 1594 | |
8ce1abc2 CB |
1595 | /* pivot_root into our new root fs */ |
1596 | ret = pivot_root(".", "."); | |
55022530 | 1597 | if (ret < 0) |
7f50ec8b | 1598 | return log_error_errno(-errno, errno, "Failed to pivot into new root directory \"%s\"", rootfs->mount); |
39c7b795 | 1599 | |
8ce1abc2 CB |
1600 | /* At this point the old-root is mounted on top of our new-root. To |
1601 | * unmounted it we must not be chdir'd into it, so escape back to | |
1602 | * old-root. | |
1603 | */ | |
7f50ec8b | 1604 | ret = fchdir(fd_oldroot); |
55022530 | 1605 | if (ret < 0) |
7f50ec8b | 1606 | return log_error_errno(-errno, errno, "Failed to enter old root directory"); |
c69bd12f | 1607 | |
7f50ec8b | 1608 | /* |
81d94a4e CB |
1609 | * Unprivileged containers will have had all their mounts turned into |
1610 | * dependent mounts when the container was created. But for privileged | |
1611 | * containers we need to turn the old root mount tree into a dependent | |
1612 | * mount tree to prevent propagating mounts and umounts into the host | |
1613 | * mount namespace. | |
8ce1abc2 CB |
1614 | */ |
1615 | ret = mount("", ".", "", MS_SLAVE | MS_REC, NULL); | |
55022530 | 1616 | if (ret < 0) |
7f50ec8b | 1617 | return log_error_errno(-errno, errno, "Failed to recursively turn old root mount tree into dependent mount"); |
8ce1abc2 CB |
1618 | |
1619 | ret = umount2(".", MNT_DETACH); | |
55022530 | 1620 | if (ret < 0) |
7f50ec8b | 1621 | return log_error_errno(-errno, errno, "Failed to detach old root directory"); |
8ce1abc2 | 1622 | |
ea57e424 | 1623 | ret = fchdir(rootfs->dfd_mnt); |
55022530 | 1624 | if (ret < 0) |
7f50ec8b | 1625 | return log_error_errno(-errno, errno, "Failed to re-enter new root directory \"%s\"", rootfs->mount); |
8ce1abc2 | 1626 | |
81d94a4e CB |
1627 | /* |
1628 | * Finally, we turn the rootfs into a shared mount. Note, that this | |
1629 | * doesn't reestablish mount propagation with the hosts mount | |
1630 | * namespace. Instead we'll create a new peer group. | |
1631 | * | |
1632 | * We're doing this because most workloads do rely on the rootfs being | |
1633 | * a shared mount. For example, systemd daemon like sytemd-udevd run in | |
1634 | * their own mount namespace. Their mount namespace has been made a | |
1635 | * dependent mount (MS_SLAVE) with the host rootfs as it's dominating | |
1636 | * mount. This means new mounts on the host propagate into the | |
1637 | * respective services. | |
1638 | * | |
1639 | * This is broken if we leave the container's rootfs a dependent mount. | |
1640 | * In which case both the container's rootfs and the service's rootfs | |
1641 | * will be dependent mounts with the host's rootfs as their dominating | |
1642 | * mount. So if you were to mount over the rootfs from the host it | |
1643 | * would not just propagate into the container's mount namespace it | |
1644 | * would also propagate into the service. That's nonsense semantics for | |
1645 | * nearly all relevant use-cases. Instead, establish the container's | |
1646 | * rootfs as a separate peer group mirroring the behavior on the host. | |
1647 | */ | |
1648 | ret = mount("", ".", "", MS_SHARED | MS_REC, NULL); | |
1649 | if (ret < 0) | |
1650 | return log_error_errno(-errno, errno, "Failed to turn new root mount tree into shared mount tree"); | |
1651 | ||
7f50ec8b | 1652 | TRACE("Changed into new rootfs \"%s\"", rootfs->mount); |
b0d7aac4 | 1653 | return 0; |
0ad19a3f | 1654 | } |
1655 | ||
8ce1abc2 CB |
1656 | static int lxc_setup_rootfs_switch_root(const struct lxc_rootfs *rootfs) |
1657 | { | |
55022530 CB |
1658 | if (!rootfs->path) |
1659 | return log_debug(0, "Container does not have a rootfs"); | |
8ce1abc2 CB |
1660 | |
1661 | if (detect_ramfs_rootfs()) | |
1662 | return lxc_chroot(rootfs); | |
1663 | ||
7f50ec8b | 1664 | return lxc_pivot_root(rootfs); |
0ad19a3f | 1665 | } |
1666 | ||
7581a82f | 1667 | static const struct id_map *find_mapped_nsid_entry(const struct lxc_conf *conf, |
8ce1abc2 CB |
1668 | unsigned id, |
1669 | enum idtype idtype) | |
f4900711 | 1670 | { |
f4900711 CB |
1671 | struct id_map *map; |
1672 | struct id_map *retmap = NULL; | |
1673 | ||
dcf0ffdf CB |
1674 | /* Shortcut for container's root mappings. */ |
1675 | if (id == 0) { | |
1676 | if (idtype == ID_TYPE_UID) | |
1677 | return conf->root_nsuid_map; | |
1678 | ||
1679 | if (idtype == ID_TYPE_GID) | |
1680 | return conf->root_nsgid_map; | |
1681 | } | |
1682 | ||
0589d744 | 1683 | list_for_each_entry(map, &conf->id_map, head) { |
f4900711 CB |
1684 | if (map->idtype != idtype) |
1685 | continue; | |
1686 | ||
1687 | if (id >= map->nsid && id < map->nsid + map->range) { | |
1688 | retmap = map; | |
1689 | break; | |
1690 | } | |
1691 | } | |
1692 | ||
1693 | return retmap; | |
1694 | } | |
1695 | ||
42c0d056 | 1696 | static int lxc_recv_devpts_from_child(struct lxc_handler *handler) |
68f3899e CB |
1697 | { |
1698 | int ret; | |
1699 | ||
1700 | if (handler->conf->pty_max <= 0) | |
1701 | return 0; | |
1702 | ||
d17c815d CB |
1703 | ret = lxc_abstract_unix_recv_one_fd(handler->data_sock[1], |
1704 | &handler->conf->devpts_fd, | |
1705 | &handler->conf->devpts_fd, | |
1706 | sizeof(handler->conf->devpts_fd)); | |
68f3899e CB |
1707 | if (ret < 0) |
1708 | return log_error_errno(-1, errno, "Failed to receive devpts fd from child"); | |
1709 | ||
1710 | TRACE("Received devpts file descriptor %d from child", handler->conf->devpts_fd); | |
1711 | return 0; | |
1712 | } | |
1713 | ||
96a980e1 | 1714 | static int lxc_setup_devpts_child(struct lxc_handler *handler) |
289b707b | 1715 | { |
96a980e1 | 1716 | __do_close int devpts_fd = -EBADF, fd_fs = -EBADF; |
289b707b | 1717 | struct lxc_conf *conf = handler->conf; |
f30fc74d | 1718 | struct lxc_rootfs *rootfs = &conf->rootfs; |
03585adc | 1719 | size_t pty_max = conf->pty_max; |
289b707b CB |
1720 | int ret; |
1721 | ||
03585adc CB |
1722 | pty_max += conf->ttys.max; |
1723 | if (pty_max <= 0) | |
1724 | return log_debug(0, "No new devpts instance will be mounted since no pts devices are required"); | |
289b707b | 1725 | |
f30fc74d CB |
1726 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), |
1727 | "/proc/self/fd/%d/pts", rootfs->dfd_dev); | |
1728 | if (ret < 0) | |
1729 | return syserror("Failed to create path"); | |
1730 | ||
1731 | (void)umount2(rootfs->buf, MNT_DETACH); | |
1732 | ||
1733 | /* Create mountpoint for devpts instance. */ | |
1734 | ret = mkdirat(rootfs->dfd_dev, "pts", 0755); | |
1735 | if (ret < 0 && errno != EEXIST) | |
1736 | return log_error_errno(-1, errno, "Failed to create \"/dev/pts\" directory"); | |
1737 | ||
96a980e1 CB |
1738 | if (can_use_mount_api()) { |
1739 | fd_fs = fs_prepare("devpts", -EBADF, "", 0, 0); | |
1740 | if (fd_fs < 0) | |
1741 | return syserror("Failed to prepare filesystem context for devpts"); | |
289b707b | 1742 | |
96a980e1 CB |
1743 | ret = fs_set_property(fd_fs, "source", "devpts"); |
1744 | if (ret < 0) | |
1745 | SYSTRACE("Failed to set \"source=devpts\" on devpts filesystem context %d", fd_fs); | |
289b707b | 1746 | |
96a980e1 CB |
1747 | ret = fs_set_property(fd_fs, "gid", "5"); |
1748 | if (ret < 0) | |
1749 | SYSTRACE("Failed to set \"gid=5\" on devpts filesystem context %d", fd_fs); | |
289b707b | 1750 | |
96a980e1 CB |
1751 | ret = fs_set_flag(fd_fs, "newinstance"); |
1752 | if (ret < 0) | |
1753 | return syserror("Failed to set \"newinstance\" property on devpts filesystem context %d", fd_fs); | |
289b707b | 1754 | |
96a980e1 CB |
1755 | ret = fs_set_property(fd_fs, "ptmxmode", "0666"); |
1756 | if (ret < 0) | |
1757 | return syserror("Failed to set \"ptmxmode=0666\" property on devpts filesystem context %d", fd_fs); | |
289b707b | 1758 | |
96a980e1 CB |
1759 | ret = fs_set_property(fd_fs, "mode", "0620"); |
1760 | if (ret < 0) | |
1761 | return syserror("Failed to set \"mode=0620\" property on devpts filesystem context %d", fd_fs); | |
289b707b | 1762 | |
03585adc | 1763 | ret = fs_set_property(fd_fs, "max", fdstr(pty_max)); |
96a980e1 CB |
1764 | if (ret < 0) |
1765 | return syserror("Failed to set \"max=%zu\" property on devpts filesystem context %d", conf->pty_max, fd_fs); | |
f30fc74d | 1766 | |
96a980e1 CB |
1767 | ret = fsconfig(fd_fs, FSCONFIG_CMD_CREATE, NULL, NULL, 0); |
1768 | if (ret < 0) | |
1769 | return syserror("Failed to finalize filesystem context %d", fd_fs); | |
289b707b | 1770 | |
96a980e1 CB |
1771 | devpts_fd = fsmount(fd_fs, FSMOUNT_CLOEXEC, MOUNT_ATTR_NOSUID | MOUNT_ATTR_NOEXEC); |
1772 | if (devpts_fd < 0) | |
1773 | return syserror("Failed to create new mount for filesystem context %d", fd_fs); | |
1774 | TRACE("Created detached devpts mount %d", devpts_fd); | |
77890c6d | 1775 | |
96a980e1 CB |
1776 | ret = move_mount(devpts_fd, "", rootfs->dfd_dev, "pts", MOVE_MOUNT_F_EMPTY_PATH); |
1777 | if (ret) | |
1778 | return syserror("Failed to attach devpts mount %d to %d/pts", conf->devpts_fd, rootfs->dfd_dev); | |
3c26f34e | 1779 | |
96a980e1 CB |
1780 | DEBUG("Attached detached devpts mount %d to %d/pts", devpts_fd, rootfs->dfd_dev); |
1781 | } else { | |
1782 | char **opts; | |
1783 | char devpts_mntopts[256]; | |
1784 | char *mntopt_sets[5]; | |
1785 | char default_devpts_mntopts[256] = "gid=5,newinstance,ptmxmode=0666,mode=0620"; | |
7e40254a | 1786 | |
f30fc74d CB |
1787 | /* |
1788 | * Fallback codepath in case the new mount API can't be used to | |
1789 | * create detached mounts. | |
1790 | */ | |
1791 | ||
289b707b | 1792 | ret = strnprintf(devpts_mntopts, sizeof(devpts_mntopts), "%s,max=%zu", |
03585adc | 1793 | default_devpts_mntopts, pty_max); |
289b707b CB |
1794 | if (ret < 0) |
1795 | return -1; | |
3c26f34e | 1796 | |
289b707b CB |
1797 | /* Create mountpoint for devpts instance. */ |
1798 | ret = mkdirat(rootfs->dfd_dev, "pts", 0755); | |
1799 | if (ret < 0 && errno != EEXIST) | |
1800 | return log_error_errno(-1, errno, "Failed to create \"/dev/pts\" directory"); | |
ce155c60 | 1801 | |
289b707b CB |
1802 | /* gid=5 && max= */ |
1803 | mntopt_sets[0] = devpts_mntopts; | |
ce155c60 | 1804 | |
289b707b CB |
1805 | /* !gid=5 && max= */ |
1806 | mntopt_sets[1] = devpts_mntopts + STRLITERALLEN("gid=5") + 1; | |
ce155c60 | 1807 | |
289b707b CB |
1808 | /* gid=5 && !max= */ |
1809 | mntopt_sets[2] = default_devpts_mntopts; | |
ce155c60 | 1810 | |
289b707b CB |
1811 | /* !gid=5 && !max= */ |
1812 | mntopt_sets[3] = default_devpts_mntopts + STRLITERALLEN("gid=5") + 1; | |
ce155c60 | 1813 | |
289b707b CB |
1814 | /* end */ |
1815 | mntopt_sets[4] = NULL; | |
70761e5e | 1816 | |
289b707b CB |
1817 | for (ret = -1, opts = mntopt_sets; opts && *opts; opts++) { |
1818 | /* mount new devpts instance */ | |
8b0ccdaa CB |
1819 | ret = mount_at(rootfs->dfd_dev, "", 0, |
1820 | rootfs->dfd_dev, "pts", PROTECT_LOOKUP_BENEATH, | |
1821 | "devpts", MS_NOSUID | MS_NOEXEC, *opts); | |
289b707b CB |
1822 | if (ret == 0) |
1823 | break; | |
1824 | } | |
289b707b CB |
1825 | if (ret < 0) |
1826 | return log_error_errno(-1, errno, "Failed to mount new devpts instance"); | |
1827 | ||
1828 | devpts_fd = open_at(rootfs->dfd_dev, "pts", PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_BENEATH_XDEV, 0); | |
1829 | if (devpts_fd < 0) { | |
1830 | devpts_fd = -EBADF; | |
1831 | TRACE("Failed to create detached devpts mount"); | |
1832 | } | |
1833 | ||
289b707b CB |
1834 | DEBUG("Mounted new devpts instance with options \"%s\"", *opts); |
1835 | } | |
03585adc | 1836 | |
96a980e1 | 1837 | handler->conf->devpts_fd = move_fd(devpts_fd); |
f797f05e | 1838 | |
03585adc CB |
1839 | /* |
1840 | * In order to allocate terminal devices the devpts filesystem will | |
1841 | * have to be attached to the filesystem at least ones in the new mount | |
1842 | * api. The reason is lengthy but the gist is that until the new mount | |
1843 | * has been attached to the filesystem it is a detached mount with an | |
1844 | * anonymous mount mamespace attached to it for which the kernel | |
1845 | * refuses certain operations. | |
1846 | * We end up here if the user has requested to allocate tty devices | |
1847 | * while not requestig pty devices be made available to the container. | |
1848 | * We only need the devpts_fd to allocate tty devices. | |
1849 | */ | |
1850 | if (conf->pty_max <= 0) | |
1851 | return 0; | |
1852 | ||
d5cb35d6 | 1853 | /* Remove any pre-existing /dev/ptmx file. */ |
a5a08920 | 1854 | ret = unlinkat(rootfs->dfd_dev, "ptmx", 0); |
b29e05d6 | 1855 | if (ret < 0) { |
55022530 CB |
1856 | if (errno != ENOENT) |
1857 | return log_error_errno(-1, errno, "Failed to remove existing \"/dev/ptmx\" file"); | |
b29e05d6 | 1858 | } else { |
0fd73091 | 1859 | DEBUG("Removed existing \"/dev/ptmx\" file"); |
3c26f34e | 1860 | } |
1861 | ||
8de0119d | 1862 | /* Create placeholder /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
a5a08920 | 1863 | ret = mknodat(rootfs->dfd_dev, "ptmx", S_IFREG | 0000, 0); |
55022530 | 1864 | if (ret < 0 && errno != EEXIST) |
8de0119d CB |
1865 | return log_error_errno(-1, errno, "Failed to create \"/dev/ptmx\" file as bind mount target"); |
1866 | DEBUG("Created \"/dev/ptmx\" file as bind mount target"); | |
77890c6d | 1867 | |
d27ae999 | 1868 | /* Main option: use a bind-mount to please AppArmor */ |
8b0ccdaa CB |
1869 | ret = mount_at(rootfs->dfd_dev, "pts/ptmx", (PROTECT_LOOKUP_BENEATH_WITH_SYMLINKS & ~RESOLVE_NO_XDEV), |
1870 | rootfs->dfd_dev, "ptmx", (PROTECT_LOOKUP_BENEATH_WITH_SYMLINKS & ~RESOLVE_NO_XDEV), | |
1871 | NULL, MS_BIND, NULL); | |
55022530 CB |
1872 | if (!ret) |
1873 | return log_debug(0, "Bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); | |
1874 | else | |
d5cb35d6 | 1875 | /* Fallthrough and try to create a symlink. */ |
0fd73091 | 1876 | ERROR("Failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 | 1877 | |
8de0119d | 1878 | /* Remove the placeholder /dev/ptmx file we created above. */ |
a5a08920 | 1879 | ret = unlinkat(rootfs->dfd_dev, "ptmx", 0); |
55022530 CB |
1880 | if (ret < 0) |
1881 | return log_error_errno(-1, errno, "Failed to remove existing \"/dev/ptmx\""); | |
d5cb35d6 CB |
1882 | |
1883 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
06853427 | 1884 | ret = symlinkat("/dev/pts/ptmx", rootfs->dfd_dev, "dev/ptmx"); |
55022530 CB |
1885 | if (ret < 0) |
1886 | return log_error_errno(-1, errno, "Failed to create symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); | |
cd54d859 | 1887 | |
185b9ee9 | 1888 | DEBUG("Created symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
3c26f34e | 1889 | return 0; |
1890 | } | |
1891 | ||
03585adc CB |
1892 | static int lxc_finish_devpts_child(struct lxc_handler *handler) |
1893 | { | |
1894 | struct lxc_conf *conf = handler->conf; | |
1895 | struct lxc_rootfs *rootfs = &conf->rootfs; | |
1896 | int ret; | |
1897 | ||
1898 | if (conf->pty_max > 0) | |
1899 | return 0; | |
1900 | ||
1901 | /* | |
1902 | * We end up here if the user has requested to allocate tty devices | |
1903 | * while not requestig pty devices be made available to the container. | |
1904 | * This means we can unmount the devpts instance. We only need the | |
1905 | * devpts_fd to allocate tty devices. | |
1906 | */ | |
1907 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), | |
1908 | "/proc/self/fd/%d/pts", rootfs->dfd_dev); | |
1909 | if (ret < 0) | |
1910 | return syserror("Failed to create path"); | |
1911 | ||
1912 | close_prot_errno_disarm(conf->devpts_fd); | |
5c6eb416 CB |
1913 | (void)umount2(rootfs->buf, MNT_DETACH); |
1914 | return 0; | |
03585adc CB |
1915 | } |
1916 | ||
111ed96e | 1917 | static int lxc_send_devpts_to_parent(struct lxc_handler *handler) |
1b82d721 CB |
1918 | { |
1919 | int ret; | |
1920 | ||
1921 | if (handler->conf->pty_max <= 0) | |
1922 | return log_debug(0, "No devpts file descriptor will be sent since no pts devices are requested"); | |
1923 | ||
1924 | ret = lxc_abstract_unix_send_fds(handler->data_sock[0], &handler->conf->devpts_fd, 1, NULL, 0); | |
1925 | if (ret < 0) | |
1926 | SYSERROR("Failed to send devpts file descriptor %d to parent", handler->conf->devpts_fd); | |
1927 | else | |
1928 | TRACE("Sent devpts file descriptor %d to parent", handler->conf->devpts_fd); | |
1929 | ||
1930 | close_prot_errno_disarm(handler->conf->devpts_fd); | |
1931 | ||
1932 | return 0; | |
1933 | } | |
1934 | ||
64a04c84 | 1935 | static int setup_personality(personality_t persona) |
cccc74b5 | 1936 | { |
0fd73091 CB |
1937 | int ret; |
1938 | ||
9c601e1f CB |
1939 | if (persona == LXC_ARCH_UNCHANGED) |
1940 | return log_debug(0, "Retaining original personality"); | |
cccc74b5 | 1941 | |
64a04c84 | 1942 | ret = lxc_personality(persona); |
55022530 | 1943 | if (ret < 0) |
9c601e1f | 1944 | return syserror("Failed to set personality to \"0lx%lx\"", persona); |
cccc74b5 | 1945 | |
38608992 | 1946 | INFO("Set personality to \"0lx%lx\"", persona); |
cccc74b5 DL |
1947 | return 0; |
1948 | } | |
1949 | ||
9f77617b | 1950 | static int bind_mount_console(int fd_devpts, struct lxc_rootfs *rootfs, |
d94a7f09 | 1951 | struct lxc_terminal *console, int fd_to) |
37c74fd1 CB |
1952 | { |
1953 | __do_close int fd_pty = -EBADF; | |
1954 | ||
1955 | if (is_empty_string(console->name)) | |
1956 | return ret_errno(EINVAL); | |
1957 | ||
1958 | /* | |
1959 | * When the pty fd stashed in console->pty has been retrieved via the | |
1960 | * TIOCGPTPEER ioctl() to avoid dangerous path-based lookups when | |
1961 | * allocating new pty devices we can't reopen it through openat2() or | |
1962 | * created a detached mount through open_tree() from it. This means we | |
1963 | * would need to mount using the path stased in console->name which is | |
1964 | * unsafe. We could be mounting a device that isn't identical to the | |
1965 | * one we've already safely opened and stashed in console->pty. | |
1966 | * So, what we do is we open an O_PATH file descriptor for | |
1967 | * console->name and verify that the opened fd and the fd we stashed in | |
1968 | * console->pty refer to the same device. If they do we can go on and | |
1969 | * created a detached mount based on the newly opened O_PATH file | |
1970 | * descriptor and then safely mount. | |
1971 | */ | |
9f77617b | 1972 | fd_pty = open_at_same(console->pty, fd_devpts, fdstr(console->pty_nr), |
d94a7f09 | 1973 | PROTECT_OPATH_FILE, PROTECT_LOOKUP_ABSOLUTE_XDEV, 0); |
37c74fd1 | 1974 | if (fd_pty < 0) |
d94a7f09 | 1975 | return syserror("Failed to open \"%s\"", console->name); |
37c74fd1 CB |
1976 | |
1977 | /* | |
1978 | * Note, there are intentionally no open or lookup restrictions since | |
1979 | * we're operating directly on the fd. | |
1980 | */ | |
d94a7f09 | 1981 | if (can_use_mount_api()) |
704cadd5 | 1982 | return fd_bind_mount(fd_pty, "", 0, 0, fd_to, "", 0, 0, 0, 0, 0, false); |
d94a7f09 CB |
1983 | |
1984 | return mount_fd(fd_pty, fd_to, "none", MS_BIND, 0); | |
37c74fd1 CB |
1985 | } |
1986 | ||
9f77617b | 1987 | static int lxc_setup_dev_console(int fd_devpts, struct lxc_rootfs *rootfs, |
d94a7f09 | 1988 | struct lxc_terminal *console) |
6e590161 | 1989 | { |
af0cf9b7 | 1990 | __do_close int fd_console = -EBADF; |
882671aa | 1991 | int ret; |
52e35957 | 1992 | |
cf68ffd9 CB |
1993 | /* |
1994 | * When we are asked to setup a console we remove any previous | |
8b1b1210 CB |
1995 | * /dev/console bind-mounts. |
1996 | */ | |
a5a08920 | 1997 | if (exists_file_at(rootfs->dfd_dev, "console")) { |
af0cf9b7 CB |
1998 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
1999 | ||
9bcde680 CB |
2000 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/dev/console", rootfs_path); |
2001 | if (ret < 0) | |
953db219 CB |
2002 | return -1; |
2003 | ||
58b38111 | 2004 | ret = lxc_unstack_mountpoint(rootfs->buf, false); |
55022530 | 2005 | if (ret < 0) |
58b38111 | 2006 | return log_error_errno(-ret, errno, "Failed to unmount \"%s\"", rootfs->buf); |
55022530 | 2007 | else |
58b38111 | 2008 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, rootfs->buf); |
8b1b1210 CB |
2009 | } |
2010 | ||
cf68ffd9 CB |
2011 | /* |
2012 | * For unprivileged containers autodev or automounts will already have | |
8b1b1210 CB |
2013 | * taken care of creating /dev/console. |
2014 | */ | |
d94a7f09 CB |
2015 | fd_console = open_at(rootfs->dfd_dev, |
2016 | "console", | |
2017 | PROTECT_OPEN | O_CREAT, | |
2018 | PROTECT_LOOKUP_BENEATH, | |
2019 | 0000); | |
af0cf9b7 | 2020 | if (fd_console < 0) |
d94a7f09 | 2021 | return syserror("Failed to create \"%d/console\"", rootfs->dfd_dev); |
52e35957 | 2022 | |
1dd71c90 | 2023 | ret = fchmod(console->pty, 0620); |
55022530 | 2024 | if (ret < 0) |
d94a7f09 | 2025 | return syserror("Failed to change console mode"); |
13954cce | 2026 | |
9f77617b | 2027 | ret = bind_mount_console(fd_devpts, rootfs, console, fd_console); |
37c74fd1 | 2028 | if (ret < 0) |
d94a7f09 CB |
2029 | return syserror("Failed to mount \"%d(%s)\" on \"%d\"", |
2030 | console->pty, console->name, fd_console); | |
6e590161 | 2031 | |
d94a7f09 | 2032 | TRACE("Setup console \"%s\"", console->name); |
7c6ef2a2 SH |
2033 | return 0; |
2034 | } | |
2035 | ||
9f77617b | 2036 | static int lxc_setup_ttydir_console(int fd_devpts, struct lxc_rootfs *rootfs, |
d94a7f09 | 2037 | struct lxc_terminal *console, |
37c74fd1 | 2038 | char *ttydir) |
7c6ef2a2 | 2039 | { |
d94a7f09 CB |
2040 | __do_close int fd_ttydir = -EBADF, fd_dev_console = -EBADF, |
2041 | fd_reg_console = -EBADF, fd_reg_ttydir_console = -EBADF; | |
3b7e332f | 2042 | int ret; |
7c6ef2a2 | 2043 | |
f6370f2a CB |
2044 | /* create dev/<ttydir> */ |
2045 | ret = mkdirat(rootfs->dfd_dev, ttydir, 0755); | |
2046 | if (ret < 0 && errno != EEXIST) | |
2047 | return syserror("Failed to create \"%d/%s\"", rootfs->dfd_dev, ttydir); | |
d94a7f09 CB |
2048 | |
2049 | fd_ttydir = open_at(rootfs->dfd_dev, | |
2050 | ttydir, | |
2051 | PROTECT_OPATH_DIRECTORY, | |
2052 | PROTECT_LOOKUP_BENEATH, | |
2053 | 0); | |
2054 | if (fd_ttydir < 0) | |
2055 | return syserror("Failed to open \"%d/%s\"", rootfs->dfd_dev, ttydir); | |
7c6ef2a2 | 2056 | |
f6370f2a | 2057 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/console", ttydir); |
9bcde680 | 2058 | if (ret < 0) |
3d7d929a CB |
2059 | return -1; |
2060 | ||
f6370f2a | 2061 | /* create dev/<ttydir>/console */ |
d94a7f09 CB |
2062 | fd_reg_ttydir_console = open_at(fd_ttydir, |
2063 | "console", | |
2064 | PROTECT_OPEN | O_CREAT, | |
2065 | PROTECT_LOOKUP_BENEATH, | |
2066 | 0000); | |
2067 | if (fd_reg_ttydir_console < 0) | |
2068 | return syserror("Failed to create \"%d/console\"", fd_ttydir); | |
2a12fefd | 2069 | |
f6370f2a | 2070 | if (file_exists(rootfs->buf)) { |
d94a7f09 CB |
2071 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
2072 | ||
2073 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/dev/console", rootfs_path); | |
2074 | if (ret < 0) | |
2075 | return -1; | |
2076 | ||
f6370f2a | 2077 | ret = lxc_unstack_mountpoint(rootfs->buf, false); |
55022530 | 2078 | if (ret < 0) |
f6370f2a | 2079 | return log_error_errno(-ret, errno, "Failed to unmount \"%s\"", rootfs->buf); |
55022530 | 2080 | else |
f6370f2a | 2081 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, rootfs->buf); |
3dc035f1 | 2082 | } |
2a12fefd | 2083 | |
d94a7f09 CB |
2084 | /* create dev/console */ |
2085 | fd_reg_console = open_at(rootfs->dfd_dev, | |
2086 | "console", | |
2087 | PROTECT_OPEN | O_CREAT, | |
2088 | PROTECT_LOOKUP_BENEATH, | |
2089 | 0000); | |
2090 | if (fd_reg_console < 0) | |
2091 | return syserror("Failed to create \"%d/console\"", rootfs->dfd_dev); | |
7c6ef2a2 | 2092 | |
1dd71c90 | 2093 | ret = fchmod(console->pty, 0620); |
55022530 | 2094 | if (ret < 0) |
d94a7f09 | 2095 | return syserror("Failed to change console mode"); |
2a12fefd | 2096 | |
d94a7f09 | 2097 | /* bind mount console to '/dev/<ttydir>/console' */ |
9f77617b | 2098 | ret = bind_mount_console(fd_devpts, rootfs, console, fd_reg_ttydir_console); |
55022530 | 2099 | if (ret < 0) |
d94a7f09 CB |
2100 | return syserror("Failed to mount \"%d(%s)\" on \"%d\"", |
2101 | console->pty, console->name, fd_reg_ttydir_console); | |
2102 | ||
2103 | fd_dev_console = open_at_same(console->pty, | |
2104 | fd_ttydir, | |
2105 | "console", | |
2106 | PROTECT_OPATH_FILE, | |
2107 | PROTECT_LOOKUP_BENEATH_XDEV, | |
2108 | 0); | |
2109 | if (fd_dev_console < 0) | |
2110 | return syserror("Failed to open \"%d/console\"", fd_ttydir); | |
2111 | ||
2112 | /* bind mount '/dev/<ttydir>/console' to '/dev/console' */ | |
2113 | if (can_use_mount_api()) | |
2114 | ret = fd_bind_mount(fd_dev_console, | |
2115 | "", | |
2116 | PROTECT_OPATH_FILE, | |
2117 | PROTECT_LOOKUP_BENEATH_XDEV, | |
2118 | fd_reg_console, | |
2119 | "", | |
2120 | PROTECT_OPATH_FILE, | |
2121 | PROTECT_LOOKUP_BENEATH, | |
2122 | 0, | |
704cadd5 CB |
2123 | 0, |
2124 | 0, | |
d94a7f09 CB |
2125 | false); |
2126 | else | |
2127 | ret = mount_fd(fd_dev_console, fd_reg_console, "none", MS_BIND, 0); | |
55022530 | 2128 | if (ret < 0) |
d94a7f09 CB |
2129 | return syserror("Failed to mount \"%d\" on \"%d\"", |
2130 | fd_dev_console, fd_reg_console); | |
3dc035f1 | 2131 | |
d94a7f09 | 2132 | TRACE("Setup console \"%s\"", console->name); |
6e590161 | 2133 | return 0; |
2134 | } | |
2135 | ||
f3dff080 CB |
2136 | static int lxc_setup_console(const struct lxc_handler *handler, |
2137 | struct lxc_rootfs *rootfs, | |
37c74fd1 | 2138 | struct lxc_terminal *console, char *ttydir) |
7c6ef2a2 | 2139 | { |
9f77617b CB |
2140 | __do_close int fd_devpts_host = -EBADF; |
2141 | int fd_devpts = handler->conf->devpts_fd; | |
2142 | int ret = -1; | |
3d7d929a | 2143 | |
37c74fd1 CB |
2144 | if (!wants_console(console)) |
2145 | return log_trace(0, "Skipping console setup"); | |
7c6ef2a2 | 2146 | |
9f77617b CB |
2147 | if (console->pty < 0) { |
2148 | /* | |
2149 | * Allocate a console from the container's devpts instance. We | |
2150 | * have checked on the host that we have enough pty devices | |
2151 | * available. | |
2152 | */ | |
2153 | ret = lxc_devpts_terminal(handler->conf->devpts_fd, &console->ptx, | |
18129d94 | 2154 | &console->pty, &console->pty_nr, false); |
9f77617b CB |
2155 | if (ret < 0) |
2156 | return syserror("Failed to allocate console from container's devpts instance"); | |
2157 | ||
2158 | ret = strnprintf(console->name, sizeof(console->name), | |
2159 | "/dev/pts/%d", console->pty_nr); | |
2160 | if (ret < 0) | |
2161 | return syserror("Failed to create console path"); | |
2162 | } else { | |
2163 | /* | |
2164 | * We're using a console from the host's devpts instance. Open | |
2165 | * it again so we can later verify that the console we're | |
2166 | * supposed to use is still the same as the one we opened on | |
2167 | * the host. | |
2168 | */ | |
2169 | fd_devpts_host = open_at(rootfs->dfd_host, | |
2170 | "dev/pts", | |
2171 | PROTECT_OPATH_DIRECTORY, | |
2172 | PROTECT_LOOKUP_BENEATH_XDEV, | |
2173 | 0); | |
2174 | if (fd_devpts_host < 0) | |
2175 | return syserror("Failed to open host devpts"); | |
2176 | ||
2177 | fd_devpts = fd_devpts_host; | |
2178 | } | |
2179 | ||
37c74fd1 | 2180 | if (ttydir) |
9f77617b | 2181 | ret = lxc_setup_ttydir_console(fd_devpts, rootfs, console, ttydir); |
37c74fd1 | 2182 | else |
9f77617b | 2183 | ret = lxc_setup_dev_console(fd_devpts, rootfs, console); |
87dfb724 CB |
2184 | if (ret < 0) |
2185 | return syserror("Failed to setup console"); | |
2186 | ||
f3dff080 CB |
2187 | /* |
2188 | * Some init's such as busybox will set sane tty settings on stdin, | |
2189 | * stdout, stderr which it thinks is the console. We already set them | |
2190 | * the way we wanted on the real terminal, and we want init to do its | |
2191 | * setup on its console ie. the pty allocated in lxc_terminal_setup() so | |
2192 | * make sure that that pty is stdin,stdout,stderr. | |
2193 | */ | |
9f77617b | 2194 | if (console->pty >= 0) { |
f3dff080 | 2195 | if (handler->daemonize || !handler->conf->is_execute) |
9f77617b | 2196 | ret = set_stdfds(console->pty); |
f3dff080 | 2197 | else |
9f77617b | 2198 | ret = lxc_terminal_set_stdfds(console->pty); |
f3dff080 | 2199 | if (ret < 0) |
9f77617b CB |
2200 | return syserror("Failed to redirect std{in,out,err} to pty file descriptor %d", console->pty); |
2201 | ||
2202 | /* | |
2203 | * If the console has been allocated from the host's devpts | |
2204 | * we're done and we don't need to send fds to the parent. | |
2205 | */ | |
2206 | if (fd_devpts_host >= 0) | |
2207 | lxc_terminal_delete(console); | |
f3dff080 CB |
2208 | } |
2209 | ||
37c74fd1 | 2210 | return ret; |
7c6ef2a2 SH |
2211 | } |
2212 | ||
a08bfbe3 | 2213 | static int parse_mntopt(char *opt, unsigned long *flags, char **data, size_t size) |
998ac676 | 2214 | { |
311bb8c5 | 2215 | size_t ret; |
998ac676 | 2216 | |
85c2de39 MB |
2217 | /* If '=' is contained in opt, the option must go into data. */ |
2218 | if (!strchr(opt, '=')) { | |
a08bfbe3 CB |
2219 | /* |
2220 | * If opt is found in mount_opt, set or clear flags. | |
2221 | * Otherwise append it to data. | |
2222 | */ | |
85c2de39 | 2223 | size_t opt_len = strlen(opt); |
a08bfbe3 | 2224 | for (struct mount_opt *mo = &mount_opt[0]; mo->name != NULL; mo++) { |
85c2de39 | 2225 | size_t mo_name_len = strlen(mo->name); |
a08bfbe3 | 2226 | |
eed95eb0 | 2227 | if (opt_len == mo_name_len && strnequal(opt, mo->name, mo_name_len)) { |
85c2de39 | 2228 | if (mo->clear) |
1e4bce2c | 2229 | *flags &= ~mo->legacy_flag; |
85c2de39 | 2230 | else |
1e4bce2c | 2231 | *flags |= mo->legacy_flag; |
a08bfbe3 | 2232 | return 0; |
85c2de39 | 2233 | } |
998ac676 RT |
2234 | } |
2235 | } | |
2236 | ||
a08bfbe3 CB |
2237 | if (strlen(*data)) { |
2238 | ret = strlcat(*data, ",", size); | |
311bb8c5 | 2239 | if (ret >= size) |
a08bfbe3 CB |
2240 | return log_error_errno(ret, errno, "Failed to append \",\" to %s", *data); |
2241 | } | |
2242 | ||
2243 | ret = strlcat(*data, opt, size); | |
311bb8c5 | 2244 | if (ret >= size) |
a08bfbe3 | 2245 | return log_error_errno(ret, errno, "Failed to append \"%s\" to %s", opt, *data); |
efed99a4 | 2246 | |
a08bfbe3 | 2247 | return 0; |
998ac676 RT |
2248 | } |
2249 | ||
d94eb390 | 2250 | int parse_mntopts_legacy(const char *mntopts, unsigned long *mntflags, char **mntdata) |
998ac676 | 2251 | { |
a08bfbe3 CB |
2252 | __do_free char *mntopts_new = NULL, *mntopts_dup = NULL; |
2253 | char *mntopt_cur = NULL; | |
efed99a4 | 2254 | size_t size; |
998ac676 | 2255 | |
a08bfbe3 CB |
2256 | if (*mntdata || *mntflags) |
2257 | return ret_errno(EINVAL); | |
911324ef DL |
2258 | |
2259 | if (!mntopts) | |
998ac676 RT |
2260 | return 0; |
2261 | ||
a08bfbe3 CB |
2262 | mntopts_dup = strdup(mntopts); |
2263 | if (!mntopts_dup) | |
2264 | return ret_errno(ENOMEM); | |
998ac676 | 2265 | |
a08bfbe3 CB |
2266 | size = strlen(mntopts_dup) + 1; |
2267 | mntopts_new = zalloc(size); | |
2268 | if (!mntopts_new) | |
2269 | return ret_errno(ENOMEM); | |
998ac676 | 2270 | |
a08bfbe3 CB |
2271 | lxc_iterate_parts(mntopt_cur, mntopts_dup, ",") |
2272 | if (parse_mntopt(mntopt_cur, mntflags, &mntopts_new, size) < 0) | |
2273 | return ret_errno(EINVAL); | |
998ac676 | 2274 | |
a08bfbe3 CB |
2275 | if (*mntopts_new) |
2276 | *mntdata = move_ptr(mntopts_new); | |
998ac676 RT |
2277 | |
2278 | return 0; | |
2279 | } | |
2280 | ||
1b82d721 CB |
2281 | static int parse_vfs_attr(struct lxc_mount_options *opts, char *opt, size_t size) |
2282 | { | |
2283 | /* | |
2284 | * If opt is found in mount_opt, set or clear flags. | |
2285 | * Otherwise append it to data. | |
2286 | */ | |
2287 | for (struct mount_opt *mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
2288 | if (!strnequal(opt, mo->name, strlen(mo->name))) | |
2289 | continue; | |
2290 | ||
2291 | /* This is a recursive bind-mount. */ | |
2292 | if (strequal(mo->name, "rbind")) { | |
3eb23230 | 2293 | opts->bind_recursively = 1; |
1b82d721 | 2294 | opts->bind = 1; |
0f43436c | 2295 | opts->mnt_flags |= mo->legacy_flag; /* MS_BIND | MS_REC */ |
1b82d721 CB |
2296 | return 0; |
2297 | } | |
2298 | ||
2299 | /* This is a bind-mount. */ | |
2300 | if (strequal(mo->name, "bind")) { | |
2301 | opts->bind = 1; | |
0f43436c | 2302 | opts->mnt_flags |= mo->legacy_flag; /* MS_BIND */ |
1b82d721 CB |
2303 | return 0; |
2304 | } | |
2305 | ||
1e03cbb1 | 2306 | if (mo->flag == (__u64)~0) |
1b82d721 CB |
2307 | return log_info(0, "Ignoring %s mount option", mo->name); |
2308 | ||
2309 | if (mo->clear) { | |
2310 | opts->attr.attr_clr |= mo->flag; | |
0f43436c | 2311 | opts->mnt_flags &= ~mo->legacy_flag; |
1b82d721 CB |
2312 | TRACE("Lowering %s", mo->name); |
2313 | } else { | |
2314 | opts->attr.attr_set |= mo->flag; | |
0f43436c | 2315 | opts->mnt_flags |= mo->legacy_flag; |
1b82d721 CB |
2316 | TRACE("Raising %s", mo->name); |
2317 | } | |
2318 | ||
2319 | return 0; | |
2320 | } | |
2321 | ||
0f43436c | 2322 | for (struct mount_opt *mo = &propagation_opt[0]; mo->name != NULL; mo++) { |
1b82d721 CB |
2323 | if (!strnequal(opt, mo->name, strlen(mo->name))) |
2324 | continue; | |
2325 | ||
6b48a575 CB |
2326 | if (strequal(mo->name, "rslave") || |
2327 | strequal(mo->name, "rshared") || | |
2328 | strequal(mo->name, "runbindable") || | |
2329 | strequal(mo->name, "rprivate")) | |
2330 | opts->propagate_recursively = 1; | |
2331 | ||
1b82d721 | 2332 | opts->attr.propagation = mo->flag; |
6b48a575 | 2333 | opts->prop_flags |= mo->legacy_flag; |
1b82d721 CB |
2334 | return 0; |
2335 | } | |
2336 | ||
2337 | return 0; | |
2338 | } | |
2339 | ||
704cadd5 | 2340 | int parse_mount_attrs(struct lxc_mount_options *opts, const char *mntopts) |
1b82d721 CB |
2341 | { |
2342 | __do_free char *mntopts_new = NULL, *mntopts_dup = NULL; | |
380fcc08 | 2343 | char *end = NULL, *mntopt_cur = NULL; |
1b82d721 CB |
2344 | int ret; |
2345 | size_t size; | |
2346 | ||
2347 | if (!opts) | |
2348 | return ret_errno(EINVAL); | |
2349 | ||
2350 | if (!mntopts) | |
2351 | return 0; | |
2352 | ||
2353 | mntopts_dup = strdup(mntopts); | |
2354 | if (!mntopts_dup) | |
2355 | return ret_errno(ENOMEM); | |
2356 | ||
2357 | size = strlen(mntopts_dup) + 1; | |
2358 | mntopts_new = zalloc(size); | |
2359 | if (!mntopts_new) | |
2360 | return ret_errno(ENOMEM); | |
2361 | ||
2362 | lxc_iterate_parts(mntopt_cur, mntopts_dup, ",") { | |
1b82d721 CB |
2363 | /* This is a filesystem specific option. */ |
2364 | if (strchr(mntopt_cur, '=')) { | |
2365 | if (!end) { | |
2366 | end = stpcpy(mntopts_new, mntopt_cur); | |
2367 | } else { | |
2368 | end = stpcpy(end, ","); | |
2369 | end = stpcpy(end, mntopt_cur); | |
2370 | } | |
2371 | ||
2372 | continue; | |
2373 | } | |
2374 | ||
2375 | /* This is a generic vfs option. */ | |
2376 | ret = parse_vfs_attr(opts, mntopt_cur, size); | |
2377 | if (ret < 0) | |
2378 | return syserror("Failed to parse mount attributes: \"%s\"", mntopt_cur); | |
2379 | } | |
2380 | ||
2381 | if (*mntopts_new) | |
2382 | opts->data = move_ptr(mntopts_new); | |
2383 | ||
2384 | return 0; | |
2385 | } | |
2386 | ||
6fd5e769 SH |
2387 | static void null_endofword(char *word) |
2388 | { | |
2389 | while (*word && *word != ' ' && *word != '\t') | |
2390 | word++; | |
2391 | *word = '\0'; | |
2392 | } | |
2393 | ||
0fd73091 | 2394 | /* skip @nfields spaces in @src */ |
6fd5e769 SH |
2395 | static char *get_field(char *src, int nfields) |
2396 | { | |
6fd5e769 | 2397 | int i; |
0fd73091 | 2398 | char *p = src; |
6fd5e769 SH |
2399 | |
2400 | for (i = 0; i < nfields; i++) { | |
2401 | while (*p && *p != ' ' && *p != '\t') | |
2402 | p++; | |
0fd73091 | 2403 | |
6fd5e769 SH |
2404 | if (!*p) |
2405 | break; | |
0fd73091 | 2406 | |
6fd5e769 SH |
2407 | p++; |
2408 | } | |
0fd73091 | 2409 | |
6fd5e769 SH |
2410 | return p; |
2411 | } | |
2412 | ||
911324ef DL |
2413 | static int mount_entry(const char *fsname, const char *target, |
2414 | const char *fstype, unsigned long mountflags, | |
d840039e YT |
2415 | unsigned long pflags, const char *data, bool optional, |
2416 | bool dev, bool relative, const char *rootfs) | |
911324ef | 2417 | { |
0ac4b28a | 2418 | int ret; |
6b5a54cd | 2419 | char srcbuf[PATH_MAX]; |
181437fd | 2420 | const char *srcpath = fsname; |
614305f3 | 2421 | #ifdef HAVE_STATVFS |
2938f7c8 | 2422 | struct statvfs sb; |
614305f3 | 2423 | #endif |
2938f7c8 | 2424 | |
181437fd | 2425 | if (relative) { |
9bcde680 CB |
2426 | ret = strnprintf(srcbuf, sizeof(srcbuf), "%s/%s", rootfs ? rootfs : "/", fsname ? fsname : ""); |
2427 | if (ret < 0) | |
55022530 | 2428 | return log_error_errno(-1, errno, "source path is too long"); |
181437fd YT |
2429 | srcpath = srcbuf; |
2430 | } | |
2431 | ||
2432 | ret = safe_mount(srcpath, target, fstype, mountflags & ~MS_REMOUNT, data, | |
0ac4b28a CB |
2433 | rootfs); |
2434 | if (ret < 0) { | |
55022530 CB |
2435 | if (optional) |
2436 | return log_info_errno(0, errno, "Failed to mount \"%s\" on \"%s\" (optional)", | |
2437 | srcpath ? srcpath : "(null)", target); | |
0ac4b28a | 2438 | |
55022530 CB |
2439 | return log_error_errno(-1, errno, "Failed to mount \"%s\" on \"%s\"", |
2440 | srcpath ? srcpath : "(null)", target); | |
911324ef DL |
2441 | } |
2442 | ||
2443 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
0ac4b28a | 2444 | |
55022530 CB |
2445 | DEBUG("Remounting \"%s\" on \"%s\" to respect bind or remount options", |
2446 | srcpath ? srcpath : "(none)", target ? target : "(none)"); | |
0ac4b28a | 2447 | |
614305f3 | 2448 | #ifdef HAVE_STATVFS |
181437fd | 2449 | if (srcpath && statvfs(srcpath, &sb) == 0) { |
94bef7e4 TA |
2450 | unsigned long required_flags = 0; |
2451 | ||
2938f7c8 SH |
2452 | if (sb.f_flag & MS_NOSUID) |
2453 | required_flags |= MS_NOSUID; | |
0ac4b28a | 2454 | |
ae7a770e | 2455 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 | 2456 | required_flags |= MS_NODEV; |
0ac4b28a | 2457 | |
2938f7c8 SH |
2458 | if (sb.f_flag & MS_RDONLY) |
2459 | required_flags |= MS_RDONLY; | |
0ac4b28a | 2460 | |
2938f7c8 SH |
2461 | if (sb.f_flag & MS_NOEXEC) |
2462 | required_flags |= MS_NOEXEC; | |
0ac4b28a | 2463 | |
55022530 CB |
2464 | DEBUG("Flags for \"%s\" were %lu, required extra flags are %lu", |
2465 | srcpath, sb.f_flag, required_flags); | |
0ac4b28a CB |
2466 | |
2467 | /* If this was a bind mount request, and required_flags | |
2938f7c8 | 2468 | * does not have any flags which are not already in |
0ac4b28a | 2469 | * mountflags, then skip the remount. |
2938f7c8 | 2470 | */ |
94bef7e4 TA |
2471 | if (!(mountflags & MS_REMOUNT) && |
2472 | (!(required_flags & ~mountflags) && !(mountflags & MS_RDONLY))) { | |
15f3e22b CB |
2473 | DEBUG("Mountflags already were %lu, skipping remount", mountflags); |
2474 | goto skipremount; | |
2938f7c8 | 2475 | } |
0ac4b28a | 2476 | |
2938f7c8 | 2477 | mountflags |= required_flags; |
6fd5e769 | 2478 | } |
614305f3 | 2479 | #endif |
911324ef | 2480 | |
181437fd | 2481 | ret = mount(srcpath, target, fstype, mountflags | MS_REMOUNT, data); |
0ac4b28a | 2482 | if (ret < 0) { |
55022530 CB |
2483 | if (optional) |
2484 | return log_info_errno(0, errno, "Failed to mount \"%s\" on \"%s\" (optional)", | |
2485 | srcpath ? srcpath : "(null)", | |
2486 | target); | |
2487 | ||
2488 | return log_error_errno(-1, errno, "Failed to mount \"%s\" on \"%s\"", | |
2489 | srcpath ? srcpath : "(null)", | |
2490 | target); | |
911324ef DL |
2491 | } |
2492 | } | |
2493 | ||
a3ed9b81 | 2494 | #ifdef HAVE_STATVFS |
2495 | skipremount: | |
2496 | #endif | |
d840039e YT |
2497 | if (pflags) { |
2498 | ret = mount(NULL, target, NULL, pflags, NULL); | |
2499 | if (ret < 0) { | |
55022530 CB |
2500 | if (optional) |
2501 | return log_info_errno(0, errno, "Failed to change mount propagation for \"%s\" (optional)", target); | |
2502 | else | |
2503 | return log_error_errno(-1, errno, "Failed to change mount propagation for \"%s\" (optional)", target); | |
d840039e YT |
2504 | } |
2505 | DEBUG("Changed mount propagation for \"%s\"", target); | |
2506 | } | |
2507 | ||
0103eb53 | 2508 | DEBUG("Mounted \"%s\" on \"%s\" with filesystem type \"%s\"", |
181437fd | 2509 | srcpath ? srcpath : "(null)", target, fstype); |
911324ef DL |
2510 | |
2511 | return 0; | |
2512 | } | |
2513 | ||
0b932f9d CB |
2514 | const char *lxc_mount_options_info[LXC_MOUNT_MAX] = { |
2515 | "create=dir", | |
2516 | "create=file", | |
2517 | "optional", | |
2518 | "relative", | |
f6815906 | 2519 | "idmap=", |
0b932f9d CB |
2520 | }; |
2521 | ||
c5e30de4 | 2522 | /* Remove "optional", "create=dir", and "create=file" from mntopt */ |
1b82d721 | 2523 | int parse_lxc_mount_attrs(struct lxc_mount_options *opts, char *mnt_opts) |
4e4ca161 | 2524 | { |
0b932f9d | 2525 | for (size_t i = LXC_MOUNT_CREATE_DIR; i < LXC_MOUNT_MAX; i++) { |
8e05f350 | 2526 | __do_close int fd_userns = -EBADF; |
0b932f9d | 2527 | const char *opt_name = lxc_mount_options_info[i]; |
f6815906 | 2528 | size_t len; |
d97d9e9f | 2529 | char *idmap_path, *opt, *opt_next; |
c5e30de4 | 2530 | |
d97d9e9f CB |
2531 | opt = strstr(mnt_opts, opt_name); |
2532 | if (!opt) | |
4e4ca161 | 2533 | continue; |
c5e30de4 | 2534 | |
0b932f9d CB |
2535 | switch (i) { |
2536 | case LXC_MOUNT_CREATE_DIR: | |
2537 | opts->create_dir = 1; | |
2538 | break; | |
2539 | case LXC_MOUNT_CREATE_FILE: | |
2540 | opts->create_file = 1; | |
2541 | break; | |
2542 | case LXC_MOUNT_OPTIONAL: | |
2543 | opts->optional = 1; | |
2544 | break; | |
2545 | case LXC_MOUNT_RELATIVE: | |
2546 | opts->relative = 1; | |
2547 | break; | |
f6815906 | 2548 | case LXC_MOUNT_IDMAP: |
d97d9e9f CB |
2549 | opt_next = opt; |
2550 | opt_next += STRLITERALLEN("idmap="); | |
2551 | idmap_path = strchrnul(opt_next, ','); | |
2e5c468a | 2552 | len = idmap_path - opt_next + 1; |
f6815906 | 2553 | |
f6815906 | 2554 | if (len >= sizeof(opts->userns_path)) |
16fcdacc CB |
2555 | return syserror_set(-EIO, "Excessive idmap path length for \"idmap=<path>\" LXC specific mount option"); |
2556 | ||
1b82d721 | 2557 | strlcpy(opts->userns_path, opt_next, len); |
2e5c468a | 2558 | |
16fcdacc CB |
2559 | if (is_empty_string(opts->userns_path)) |
2560 | return syserror_set(-EINVAL, "Missing idmap path for \"idmap=<path>\" LXC specific mount option"); | |
2561 | ||
1b82d721 | 2562 | if (!strequal(opts->userns_path, "container")) { |
4b875ef9 CB |
2563 | fd_userns = open(opts->userns_path, O_RDONLY | O_NOCTTY | O_CLOEXEC); |
2564 | if (fd_userns < 0) | |
1b82d721 | 2565 | return syserror("Failed to open user namespace %s", opts->userns_path); |
4b875ef9 | 2566 | } |
e26cf563 CB |
2567 | |
2568 | TRACE("Parse LXC specific mount option %d->\"idmap=%s\"", fd_userns, opts->userns_path); | |
f6815906 | 2569 | break; |
0b932f9d | 2570 | default: |
16fcdacc | 2571 | return syserror_set(-EINVAL, "Unknown LXC specific mount option"); |
4e4ca161 | 2572 | } |
c5e30de4 | 2573 | |
d97d9e9f CB |
2574 | opt_next = strchr(opt, ','); |
2575 | if (!opt_next) | |
2576 | *opt = '\0'; /* no more mntopts, so just chop it here */ | |
0b932f9d | 2577 | else |
d97d9e9f | 2578 | memmove(opt, opt_next + 1, strlen(opt_next + 1) + 1); |
4e4ca161 | 2579 | } |
16fcdacc CB |
2580 | |
2581 | return 0; | |
4e4ca161 SH |
2582 | } |
2583 | ||
4d5b72a1 | 2584 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
749f98d9 CB |
2585 | const char *path, |
2586 | const struct lxc_rootfs *rootfs, | |
0fd73091 | 2587 | const char *lxc_name, const char *lxc_path) |
0ad19a3f | 2588 | { |
7a76eeaa | 2589 | __do_free char *p1 = NULL; |
3b7e332f | 2590 | int ret; |
7a76eeaa | 2591 | char *p2; |
911324ef | 2592 | |
eed95eb0 | 2593 | if (strnequal(mntent->mnt_type, "overlay", 7)) { |
749f98d9 | 2594 | ret = ovl_mkdir(mntent, rootfs, lxc_name, lxc_path); |
12e6ab5d CB |
2595 | if (ret < 0) |
2596 | return -1; | |
2597 | } | |
6e46cc0d | 2598 | |
34cfffb3 | 2599 | if (hasmntopt(mntent, "create=dir")) { |
749f98d9 | 2600 | ret = mkdir_p(path, 0755); |
55022530 CB |
2601 | if (ret < 0 && errno != EEXIST) |
2602 | return log_error_errno(-1, errno, "Failed to create directory \"%s\"", path); | |
34cfffb3 SG |
2603 | } |
2604 | ||
0fd73091 CB |
2605 | if (!hasmntopt(mntent, "create=file")) |
2606 | return 0; | |
749f98d9 | 2607 | |
0fd73091 CB |
2608 | ret = access(path, F_OK); |
2609 | if (ret == 0) | |
2610 | return 0; | |
749f98d9 | 2611 | |
0fd73091 CB |
2612 | p1 = strdup(path); |
2613 | if (!p1) | |
2614 | return -1; | |
749f98d9 | 2615 | |
0fd73091 | 2616 | p2 = dirname(p1); |
749f98d9 | 2617 | |
0fd73091 | 2618 | ret = mkdir_p(p2, 0755); |
55022530 CB |
2619 | if (ret < 0 && errno != EEXIST) |
2620 | return log_error_errno(-1, errno, "Failed to create directory \"%s\"", path); | |
749f98d9 | 2621 | |
3b7e332f CB |
2622 | ret = mknod(path, S_IFREG | 0000, 0); |
2623 | if (ret < 0 && errno != EEXIST) | |
2624 | return -errno; | |
0fd73091 | 2625 | |
749f98d9 | 2626 | return 0; |
4d5b72a1 NC |
2627 | } |
2628 | ||
ec50007f CB |
2629 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
2630 | * without a rootfs. */ | |
db4aba38 | 2631 | static inline int mount_entry_on_generic(struct mntent *mntent, |
d8b712bc CB |
2632 | const char *path, |
2633 | const struct lxc_rootfs *rootfs, | |
2634 | const char *lxc_name, | |
2635 | const char *lxc_path) | |
4d5b72a1 | 2636 | { |
fd214f37 | 2637 | __do_free char *mntdata = NULL; |
a08bfbe3 | 2638 | char *rootfs_path = NULL; |
d8b712bc | 2639 | int ret; |
181437fd | 2640 | bool dev, optional, relative; |
0b932f9d | 2641 | struct lxc_mount_options opts = {}; |
d8b712bc CB |
2642 | |
2643 | optional = hasmntopt(mntent, "optional") != NULL; | |
2644 | dev = hasmntopt(mntent, "dev") != NULL; | |
181437fd | 2645 | relative = hasmntopt(mntent, "relative") != NULL; |
d8b712bc | 2646 | |
ec50007f CB |
2647 | if (rootfs && rootfs->path) |
2648 | rootfs_path = rootfs->mount; | |
2649 | ||
d8b712bc CB |
2650 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, |
2651 | lxc_path); | |
2652 | if (ret < 0) { | |
2653 | if (optional) | |
2654 | return 0; | |
608e3567 | 2655 | |
d8b712bc CB |
2656 | return -1; |
2657 | } | |
16fcdacc | 2658 | |
1b82d721 | 2659 | ret = parse_lxc_mount_attrs(&opts, mntent->mnt_opts); |
16fcdacc CB |
2660 | if (ret < 0) |
2661 | return ret; | |
4e4ca161 | 2662 | |
1b82d721 CB |
2663 | /* |
2664 | * Idmapped mount entries will be setup by the parent for us. Note that | |
2665 | * we rely on mount_entry_create_dir_file() above to have already | |
2666 | * created the target path for us. So the parent can just open the | |
2667 | * target and send us the target fd. | |
2668 | */ | |
2669 | errno = EOPNOTSUPP; | |
fa8e75f0 | 2670 | if (!is_empty_string(opts.userns_path)) |
1b82d721 | 2671 | return systrace_ret(0, "Skipping idmapped mount entry"); |
fa8e75f0 | 2672 | |
2ff1170b | 2673 | ret = parse_mount_attrs(&opts, mntent->mnt_opts); |
d840039e YT |
2674 | if (ret < 0) |
2675 | return -1; | |
2676 | ||
2ff1170b CB |
2677 | ret = mount_entry(mntent->mnt_fsname, |
2678 | path, | |
2679 | mntent->mnt_type, | |
2680 | opts.mnt_flags, | |
2681 | opts.prop_flags, | |
2682 | opts.data, | |
2683 | optional, | |
2684 | dev, | |
2685 | relative, | |
2686 | rootfs_path); | |
68c152ef | 2687 | |
911324ef DL |
2688 | return ret; |
2689 | } | |
2690 | ||
8183f09e CB |
2691 | static inline int mount_entry_on_systemfs(struct lxc_rootfs *rootfs, |
2692 | struct mntent *mntent) | |
db4aba38 | 2693 | { |
1433c9f9 CB |
2694 | int ret; |
2695 | ||
2696 | /* For containers created without a rootfs all mounts are treated as | |
07667a6a CB |
2697 | * absolute paths starting at / on the host. |
2698 | */ | |
1433c9f9 | 2699 | if (mntent->mnt_dir[0] != '/') |
9bcde680 | 2700 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "/%s", mntent->mnt_dir); |
1433c9f9 | 2701 | else |
9bcde680 CB |
2702 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s", mntent->mnt_dir); |
2703 | if (ret < 0) | |
1433c9f9 | 2704 | return -1; |
1433c9f9 | 2705 | |
8183f09e | 2706 | return mount_entry_on_generic(mntent, rootfs->buf, NULL, NULL, NULL); |
db4aba38 NC |
2707 | } |
2708 | ||
4e4ca161 | 2709 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
9c0fd29a | 2710 | struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2711 | const char *lxc_name, |
2712 | const char *lxc_path) | |
911324ef | 2713 | { |
bdd2b34c | 2714 | int offset; |
013bd428 | 2715 | char *aux; |
67e571de | 2716 | const char *lxcpath; |
bdd2b34c | 2717 | int ret = 0; |
0ad19a3f | 2718 | |
593e8478 | 2719 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
bdd2b34c | 2720 | if (!lxcpath) |
2a59a681 | 2721 | return -1; |
2a59a681 | 2722 | |
bdd2b34c CB |
2723 | /* If rootfs->path is a blockdev path, allow container fstab to use |
2724 | * <lxcpath>/<name>/rootfs" as the target prefix. | |
2725 | */ | |
9bcde680 CB |
2726 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/%s/rootfs", lxcpath, lxc_name); |
2727 | if (ret < 0) | |
80a881b2 SH |
2728 | goto skipvarlib; |
2729 | ||
9c0fd29a | 2730 | aux = strstr(mntent->mnt_dir, rootfs->buf); |
80a881b2 | 2731 | if (aux) { |
9c0fd29a | 2732 | offset = strlen(rootfs->buf); |
80a881b2 SH |
2733 | goto skipabs; |
2734 | } | |
2735 | ||
2736 | skipvarlib: | |
013bd428 | 2737 | aux = strstr(mntent->mnt_dir, rootfs->path); |
55022530 CB |
2738 | if (!aux) |
2739 | return log_warn(ret, "Ignoring mount point \"%s\"", mntent->mnt_dir); | |
80a881b2 SH |
2740 | offset = strlen(rootfs->path); |
2741 | ||
2742 | skipabs: | |
9bcde680 CB |
2743 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/%s", rootfs->mount, aux + offset); |
2744 | if (ret < 0) | |
a17b1e65 | 2745 | return -1; |
a17b1e65 | 2746 | |
9c0fd29a | 2747 | return mount_entry_on_generic(mntent, rootfs->buf, rootfs, lxc_name, lxc_path); |
911324ef | 2748 | } |
d330fe7b | 2749 | |
4e4ca161 | 2750 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
4806d3b9 | 2751 | struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2752 | const char *lxc_name, |
2753 | const char *lxc_path) | |
911324ef | 2754 | { |
911324ef | 2755 | int ret; |
d330fe7b | 2756 | |
34cfffb3 | 2757 | /* relative to root mount point */ |
9bcde680 CB |
2758 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/%s", rootfs->mount, mntent->mnt_dir); |
2759 | if (ret < 0) | |
9ba8130c | 2760 | return -1; |
911324ef | 2761 | |
4806d3b9 | 2762 | return mount_entry_on_generic(mntent, rootfs->buf, rootfs, lxc_name, lxc_path); |
911324ef DL |
2763 | } |
2764 | ||
8183f09e | 2765 | static int mount_file_entries(struct lxc_rootfs *rootfs, FILE *file, |
1ae3c19f | 2766 | const char *lxc_name, const char *lxc_path) |
911324ef | 2767 | { |
9d03d857 | 2768 | char buf[PATH_MAX]; |
0fd73091 | 2769 | struct mntent mntent; |
e76b8764 | 2770 | |
aaf901be | 2771 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
9d03d857 CB |
2772 | int ret; |
2773 | ||
1ae3c19f | 2774 | if (!rootfs->path) |
8183f09e | 2775 | ret = mount_entry_on_systemfs(rootfs, &mntent); |
1ae3c19f CB |
2776 | else if (mntent.mnt_dir[0] != '/') |
2777 | ret = mount_entry_on_relative_rootfs(&mntent, rootfs, | |
2778 | lxc_name, lxc_path); | |
2779 | else | |
2780 | ret = mount_entry_on_absolute_rootfs(&mntent, rootfs, | |
9d03d857 | 2781 | lxc_name, lxc_path); |
1ae3c19f CB |
2782 | if (ret < 0) |
2783 | return -1; | |
0ad19a3f | 2784 | } |
cd54d859 | 2785 | |
55022530 CB |
2786 | if (!feof(file) || ferror(file)) |
2787 | return log_error(-1, "Failed to parse mount entries"); | |
9d03d857 CB |
2788 | |
2789 | return 0; | |
e7938e9e MN |
2790 | } |
2791 | ||
55022530 CB |
2792 | static inline void __auto_endmntent__(FILE **f) |
2793 | { | |
2794 | if (*f) | |
2795 | endmntent(*f); | |
2796 | } | |
2797 | ||
2798 | #define __do_endmntent __attribute__((__cleanup__(__auto_endmntent__))) | |
2799 | ||
48e5dcc8 | 2800 | static int setup_mount_fstab(struct lxc_rootfs *rootfs, const char *fstab, |
8183f09e | 2801 | const char *lxc_name, const char *lxc_path) |
e7938e9e | 2802 | { |
55022530 | 2803 | __do_endmntent FILE *f = NULL; |
e7938e9e MN |
2804 | int ret; |
2805 | ||
2806 | if (!fstab) | |
2807 | return 0; | |
2808 | ||
55022530 CB |
2809 | f = setmntent(fstab, "re"); |
2810 | if (!f) | |
2811 | return log_error_errno(-1, errno, "Failed to open \"%s\"", fstab); | |
e7938e9e | 2812 | |
a7c6e830 | 2813 | ret = mount_file_entries(rootfs, f, lxc_name, lxc_path); |
42dff448 CB |
2814 | if (ret < 0) |
2815 | ERROR("Failed to set up mount entries"); | |
e7938e9e | 2816 | |
0ad19a3f | 2817 | return ret; |
2818 | } | |
2819 | ||
1800f924 WB |
2820 | /* |
2821 | * In order for nested containers to be able to mount /proc and /sys they need | |
2822 | * to see a "pure" proc and sysfs mount points with nothing mounted on top | |
2823 | * (like lxcfs). | |
2824 | * For this we provide proc and sysfs in /dev/.lxc/{proc,sys} while using an | |
2825 | * apparmor rule to deny access to them. This is mostly for convenience: The | |
2826 | * container's root user can mount them anyway and thus has access to the two | |
2827 | * file systems. But a non-root user in the container should not be allowed to | |
2828 | * access them as a side effect without explicitly allowing it. | |
2829 | */ | |
2830 | static const char nesting_helpers[] = | |
dc691e34 CB |
2831 | "proc dev/.lxc/proc proc create=dir,optional 0 0\n" |
2832 | "sys dev/.lxc/sys sysfs create=dir,optional 0 0\n"; | |
1800f924 | 2833 | |
be0bc4d1 | 2834 | FILE *make_anonymous_mount_file(const struct list_head *mount_entries, |
1800f924 | 2835 | bool include_nesting_helpers) |
e7938e9e | 2836 | { |
f62cf1d4 | 2837 | __do_close int fd = -EBADF; |
4110345b | 2838 | FILE *f; |
5ef5c9a3 | 2839 | int ret; |
be0bc4d1 | 2840 | struct string_entry *entry; |
5ef5c9a3 | 2841 | |
0fd73091 | 2842 | fd = memfd_create(".lxc_mount_file", MFD_CLOEXEC); |
5ef5c9a3 | 2843 | if (fd < 0) { |
a324e7eb CB |
2844 | char template[] = P_tmpdir "/.lxc_mount_file_XXXXXX"; |
2845 | ||
5ef5c9a3 CB |
2846 | if (errno != ENOSYS) |
2847 | return NULL; | |
a324e7eb CB |
2848 | |
2849 | fd = lxc_make_tmpfile(template, true); | |
55022530 CB |
2850 | if (fd < 0) |
2851 | return log_error_errno(NULL, errno, "Could not create temporary mount file"); | |
0fd73091 | 2852 | |
6bd04140 | 2853 | TRACE("Created temporary mount file"); |
5ef5c9a3 | 2854 | } |
e7938e9e | 2855 | |
be0bc4d1 | 2856 | list_for_each_entry(entry, mount_entries, head) { |
0fd73091 CB |
2857 | size_t len; |
2858 | ||
be0bc4d1 | 2859 | len = strlen(entry->val); |
5ef5c9a3 | 2860 | |
be0bc4d1 | 2861 | ret = lxc_write_nointr(fd, entry->val, len); |
02d477cc | 2862 | if (ret < 0 || (size_t)ret != len) |
79bcf5ee | 2863 | return NULL; |
0fd73091 | 2864 | |
489f39be | 2865 | ret = lxc_write_nointr(fd, "\n", 1); |
0fd73091 | 2866 | if (ret != 1) |
79bcf5ee | 2867 | return NULL; |
e7938e9e MN |
2868 | } |
2869 | ||
1800f924 WB |
2870 | if (include_nesting_helpers) { |
2871 | ret = lxc_write_nointr(fd, nesting_helpers, | |
6333c915 CB |
2872 | STRARRAYLEN(nesting_helpers)); |
2873 | if (ret != STRARRAYLEN(nesting_helpers)) | |
79bcf5ee | 2874 | return NULL; |
1800f924 WB |
2875 | } |
2876 | ||
0fd73091 CB |
2877 | ret = lseek(fd, 0, SEEK_SET); |
2878 | if (ret < 0) | |
79bcf5ee | 2879 | return NULL; |
0fd73091 | 2880 | |
4110345b CB |
2881 | f = fdopen(fd, "re+"); |
2882 | if (f) | |
2883 | move_fd(fd); /* Transfer ownership of fd. */ | |
2884 | return f; | |
9fc7f8c0 TA |
2885 | } |
2886 | ||
06749971 | 2887 | static int setup_mount_entries(const struct lxc_conf *conf, |
be0bc4d1 | 2888 | struct lxc_rootfs *rootfs, |
48e5dcc8 | 2889 | const char *lxc_name, const char *lxc_path) |
9fc7f8c0 | 2890 | { |
c85ced65 | 2891 | __do_fclose FILE *f = NULL; |
9fc7f8c0 | 2892 | |
be0bc4d1 | 2893 | f = make_anonymous_mount_file(&conf->mount_entries, conf->lsm_aa_allow_nesting); |
19b5d755 | 2894 | if (!f) |
9fc7f8c0 | 2895 | return -1; |
e7938e9e | 2896 | |
a7c6e830 | 2897 | return mount_file_entries(rootfs, f, lxc_name, lxc_path); |
e7938e9e MN |
2898 | } |
2899 | ||
1b82d721 CB |
2900 | static int __lxc_idmapped_mounts_child(struct lxc_handler *handler, FILE *f) |
2901 | { | |
2902 | struct lxc_conf *conf = handler->conf; | |
2903 | struct lxc_rootfs *rootfs = &conf->rootfs; | |
5a782dca | 2904 | int mnt_seq = 0; |
1b82d721 CB |
2905 | int ret; |
2906 | char buf[PATH_MAX]; | |
2907 | struct mntent mntent; | |
2908 | ||
2909 | while (getmntent_r(f, &mntent, buf, sizeof(buf))) { | |
2910 | __do_close int fd_from = -EBADF, fd_to = -EBADF, | |
2911 | fd_userns = -EBADF; | |
2912 | __do_free char *__data = NULL; | |
5a782dca | 2913 | int cur_mnt_seq = -1; |
1b82d721 CB |
2914 | struct lxc_mount_options opts = {}; |
2915 | int dfd_from; | |
2916 | const char *source_relative, *target_relative; | |
c1115e15 | 2917 | struct mount_attr attr = {}; |
1b82d721 CB |
2918 | |
2919 | ret = parse_lxc_mount_attrs(&opts, mntent.mnt_opts); | |
2920 | if (ret < 0) | |
2921 | return syserror("Failed to parse LXC specific mount options"); | |
2922 | __data = opts.data; | |
2923 | ||
2924 | ret = parse_mount_attrs(&opts, mntent.mnt_opts); | |
2925 | if (ret < 0) | |
2926 | return syserror("Failed to parse mount options"); | |
2927 | ||
2928 | /* No idmapped mount entry so skip it. */ | |
2929 | if (is_empty_string(opts.userns_path)) | |
2930 | continue; | |
2931 | ||
2932 | if (!can_use_bind_mounts()) | |
2933 | return syserror_set(-EINVAL, "Kernel does not support idmapped mounts"); | |
2934 | ||
2935 | if (!opts.bind) | |
2936 | return syserror_set(-EINVAL, "Only bind mounts can currently be idmapped"); | |
2937 | ||
2938 | /* We don't support new filesystem mounts yet. */ | |
2939 | if (!is_empty_string(mntent.mnt_type) && | |
2940 | !strequal(mntent.mnt_type, "none")) | |
2941 | return syserror_set(-EINVAL, "Only bind mounts can currently be idmapped"); | |
2942 | ||
2943 | /* Someone specified additional mount options for a bind-mount. */ | |
2944 | if (!is_empty_string(opts.data)) | |
2945 | return syserror_set(-EINVAL, "Bind mounts don't support non-generic mount options"); | |
2946 | ||
2947 | /* | |
2948 | * The source path is supposed to be taken relative to the | |
2949 | * container's rootfs mount or - if the container does not have | |
2950 | * a separate rootfs - to the host's /. | |
2951 | */ | |
2952 | source_relative = deabs(mntent.mnt_fsname); | |
2953 | if (opts.relative || !rootfs->path) | |
2954 | dfd_from = rootfs->dfd_mnt; | |
2955 | else | |
2956 | dfd_from = rootfs->dfd_host; | |
2957 | fd_from = open_tree(dfd_from, source_relative, | |
2958 | OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC | | |
3eb23230 | 2959 | (opts.bind_recursively ? AT_RECURSIVE : 0)); |
1b82d721 CB |
2960 | if (fd_from < 0) |
2961 | return syserror("Failed to create detached %smount of %d/%s", | |
3eb23230 | 2962 | opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
2963 | dfd_from, source_relative); |
2964 | ||
2965 | if (strequal(opts.userns_path, "container")) | |
2966 | fd_userns = openat(dfd_from, "proc/self/ns/user", O_RDONLY | O_CLOEXEC); | |
2967 | else | |
2968 | fd_userns = open_at(-EBADF, opts.userns_path, | |
2969 | PROTECT_OPEN_WITH_TRAILING_SYMLINKS, 0, 0); | |
2970 | if (fd_userns < 0) { | |
2971 | if (opts.optional) { | |
2972 | TRACE("Skipping optional idmapped mount"); | |
2973 | continue; | |
2974 | } | |
2975 | ||
2976 | return syserror("Failed to open user namespace \"%s\" for detached %smount of %d/%s", | |
3eb23230 | 2977 | opts.userns_path, opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
2978 | dfd_from, source_relative); |
2979 | } | |
2980 | ||
2981 | ret = __lxc_abstract_unix_send_two_fds(handler->data_sock[0], | |
2982 | fd_from, fd_userns, | |
2983 | &opts, sizeof(opts)); | |
2984 | if (ret <= 0) { | |
2985 | if (opts.optional) { | |
2986 | TRACE("Skipping optional idmapped mount"); | |
2987 | continue; | |
2988 | } | |
2989 | ||
2990 | return syserror("Failed to send file descriptor %d for detached %smount of %d/%s and file descriptor %d of user namespace \"%s\" to parent", | |
3eb23230 | 2991 | fd_from, opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
2992 | dfd_from, source_relative, fd_userns, |
2993 | opts.userns_path); | |
2994 | } | |
2995 | ||
5a782dca CB |
2996 | ret = lxc_abstract_unix_rcv_credential(handler->data_sock[0], |
2997 | &cur_mnt_seq, | |
2998 | sizeof(cur_mnt_seq)); | |
1b82d721 CB |
2999 | if (ret <= 0) { |
3000 | if (opts.optional) { | |
3001 | TRACE("Skipping optional idmapped mount"); | |
3002 | continue; | |
3003 | } | |
3004 | ||
3005 | return syserror("Failed to receive notification that parent idmapped detached %smount %d/%s to user namespace %d", | |
3eb23230 | 3006 | opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
3007 | dfd_from, source_relative, fd_userns); |
3008 | } | |
3009 | ||
5a782dca CB |
3010 | if (mnt_seq != cur_mnt_seq) |
3011 | return syserror("Expected mount sequence number and mount sequence number from parent mismatch: %d != %d", | |
3012 | mnt_seq, cur_mnt_seq); | |
3013 | mnt_seq++; | |
3014 | ||
6b48a575 CB |
3015 | /* Set regular mount options. */ |
3016 | attr = opts.attr; | |
3017 | attr.propagation = 0; | |
3018 | ret = mount_setattr(fd_from, | |
3019 | "", | |
3020 | AT_EMPTY_PATH | | |
3eb23230 | 3021 | (opts.bind_recursively ? AT_RECURSIVE : 0), |
6b48a575 CB |
3022 | &attr, |
3023 | sizeof(attr)); | |
1b82d721 CB |
3024 | if (ret < 0) { |
3025 | if (opts.optional) { | |
3026 | TRACE("Skipping optional idmapped mount"); | |
3027 | continue; | |
3028 | } | |
3029 | ||
6b48a575 | 3030 | return syserror("Failed to set %smount options on detached %d/%s", |
3eb23230 | 3031 | opts.bind_recursively ? "recursive " : "", |
6b48a575 CB |
3032 | dfd_from, source_relative); |
3033 | } | |
3034 | ||
3035 | /* Set propagation mount options. */ | |
3036 | if (opts.attr.propagation) { | |
c1115e15 | 3037 | attr = (struct mount_attr) { |
1e03cbb1 | 3038 | .propagation = opts.attr.propagation, |
6b48a575 CB |
3039 | }; |
3040 | ||
3041 | ret = mount_setattr(fd_from, | |
3042 | "", | |
3043 | AT_EMPTY_PATH | | |
3044 | (opts.propagate_recursively ? AT_RECURSIVE : 0), | |
3045 | &attr, | |
3046 | sizeof(attr)); | |
3047 | if (ret < 0) { | |
3048 | if (opts.optional) { | |
3049 | TRACE("Skipping optional idmapped mount"); | |
3050 | continue; | |
3051 | } | |
3052 | ||
3053 | return syserror("Failed to set %spropagation mount options on detached %d/%s", | |
3054 | opts.bind_recursively ? "recursive " : "", | |
3055 | dfd_from, source_relative); | |
3056 | } | |
1b82d721 CB |
3057 | } |
3058 | ||
6b48a575 | 3059 | |
1b82d721 CB |
3060 | /* |
3061 | * In contrast to the legacy mount codepath we will simplify | |
3062 | * our lifes and just always treat the target mountpoint to be | |
3063 | * relative to the container's rootfs mountpoint or - if the | |
3064 | * container does not have a separate rootfs - to the host's /. | |
3065 | */ | |
3066 | ||
3067 | target_relative = deabs(mntent.mnt_dir); | |
3068 | if (rootfs->path) | |
3069 | dfd_from = rootfs->dfd_mnt; | |
3070 | else | |
3071 | dfd_from = rootfs->dfd_host; | |
4a66dabf | 3072 | fd_to = open_at(dfd_from, target_relative, PROTECT_OPATH_FILE, PROTECT_LOOKUP_BENEATH_XDEV, 0); |
1b82d721 CB |
3073 | if (fd_to < 0) { |
3074 | if (opts.optional) { | |
3075 | TRACE("Skipping optional idmapped mount"); | |
3076 | continue; | |
3077 | } | |
3078 | ||
3079 | return syserror("Failed to open target mountpoint %d/%s for detached idmapped %smount %d:%d/%s", | |
3080 | dfd_from, target_relative, | |
3eb23230 | 3081 | opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
3082 | fd_userns, dfd_from, source_relative); |
3083 | } | |
3084 | ||
3085 | ret = move_detached_mount(fd_from, fd_to, "", 0, 0); | |
3086 | if (ret) { | |
3087 | if (opts.optional) { | |
3088 | TRACE("Skipping optional idmapped mount"); | |
3089 | continue; | |
3090 | } | |
3091 | ||
3092 | return syserror("Failed to attach detached idmapped %smount %d:%d/%s to target mountpoint %d/%s", | |
3eb23230 | 3093 | opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
3094 | fd_userns, dfd_from, source_relative, dfd_from, target_relative); |
3095 | } | |
3096 | ||
3097 | TRACE("Attached detached idmapped %smount %d:%d/%s to target mountpoint %d/%s", | |
3eb23230 | 3098 | opts.bind_recursively ? "recursive " : "", fd_userns, dfd_from, |
1b82d721 CB |
3099 | source_relative, dfd_from, target_relative); |
3100 | } | |
3101 | ||
3102 | if (!feof(f) || ferror(f)) | |
3103 | return syserror_set(-EINVAL, "Failed to parse mount entries"); | |
3104 | ||
3105 | return 0; | |
3106 | } | |
3107 | ||
3108 | static int lxc_idmapped_mounts_child(struct lxc_handler *handler) | |
3109 | { | |
3110 | __do_fclose FILE *f_entries = NULL; | |
3111 | int fret = -1; | |
3112 | struct lxc_conf *conf = handler->conf; | |
3113 | const char *fstab = conf->fstab; | |
1b82d721 CB |
3114 | int ret; |
3115 | ||
be0bc4d1 CB |
3116 | f_entries = make_anonymous_mount_file(&conf->mount_entries, |
3117 | conf->lsm_aa_allow_nesting); | |
1b82d721 CB |
3118 | if (!f_entries) { |
3119 | SYSERROR("Failed to create anonymous mount file"); | |
3120 | goto out; | |
3121 | } | |
3122 | ||
3123 | ret = __lxc_idmapped_mounts_child(handler, f_entries); | |
3124 | if (ret) { | |
3125 | SYSERROR("Failed to setup idmapped mount entries"); | |
3126 | goto out; | |
3127 | } | |
3128 | ||
3129 | TRACE("Finished setting up idmapped mounts"); | |
3130 | ||
3131 | if (fstab) { | |
3132 | __do_endmntent FILE *f_fstab = NULL; | |
3133 | ||
3134 | f_fstab = setmntent(fstab, "re"); | |
3135 | if (!f_fstab) { | |
3136 | SYSERROR("Failed to open fstab format file \"%s\"", fstab); | |
3137 | goto out; | |
3138 | } | |
3139 | ||
3140 | ret = __lxc_idmapped_mounts_child(handler, f_fstab); | |
3141 | if (ret) { | |
3142 | SYSERROR("Failed to setup idmapped mount entries specified in fstab"); | |
3143 | goto out; | |
3144 | } | |
3145 | ||
3146 | TRACE("Finished setting up idmapped mounts specified in fstab"); | |
3147 | } | |
3148 | ||
3149 | fret = 0; | |
3150 | ||
3151 | out: | |
3152 | ret = lxc_abstract_unix_send_credential(handler->data_sock[0], NULL, 0); | |
3153 | if (ret < 0) | |
caaa223b | 3154 | return syserror("Failed to inform parent that we are done setting up mounts"); |
1b82d721 CB |
3155 | |
3156 | return fret; | |
3157 | } | |
3158 | ||
7418b27f | 3159 | int parse_cap(const char *cap_name, __u32 *cap) |
bab88e68 | 3160 | { |
0fd73091 | 3161 | size_t end = sizeof(caps_opt) / sizeof(caps_opt[0]); |
7418b27f CB |
3162 | int ret; |
3163 | unsigned int res; | |
3164 | __u32 last_cap; | |
bab88e68 | 3165 | |
7418b27f | 3166 | if (strequal(cap_name, "none")) |
7035407c DE |
3167 | return -2; |
3168 | ||
7418b27f CB |
3169 | for (size_t i = 0; i < end; i++) { |
3170 | if (!strequal(cap_name, caps_opt[i].name)) | |
bab88e68 CS |
3171 | continue; |
3172 | ||
7418b27f CB |
3173 | *cap = caps_opt[i].value; |
3174 | return 0; | |
bab88e68 CS |
3175 | } |
3176 | ||
7418b27f CB |
3177 | /* |
3178 | * Try to see if it's numeric, so the user may specify | |
3179 | * capabilities that the running kernel knows about but we | |
3180 | * don't. | |
3181 | */ | |
3182 | ret = lxc_safe_uint(cap_name, &res); | |
3183 | if (ret < 0) | |
3184 | return -1; | |
3185 | ||
3186 | ret = lxc_caps_last_cap(&last_cap); | |
3187 | if (ret) | |
3188 | return -1; | |
3189 | ||
3190 | if ((__u32)res > last_cap) | |
3191 | return -1; | |
bab88e68 | 3192 | |
7418b27f CB |
3193 | *cap = (__u32)res; |
3194 | return 0; | |
bab88e68 CS |
3195 | } |
3196 | ||
7418b27f | 3197 | bool has_cap(__u32 cap, struct lxc_conf *conf) |
0769b82a | 3198 | { |
20ab7578 CB |
3199 | bool cap_in_list = false; |
3200 | struct cap_entry *cap_entry; | |
0769b82a | 3201 | |
20ab7578 CB |
3202 | list_for_each_entry(cap_entry, &conf->caps.list, head) { |
3203 | if (cap_entry->cap != cap) | |
3204 | continue; | |
3205 | ||
3206 | cap_in_list = true; | |
0769b82a CS |
3207 | } |
3208 | ||
20ab7578 CB |
3209 | /* The capability is kept. */ |
3210 | if (conf->caps.keep) | |
3211 | return cap_in_list; | |
3212 | ||
3213 | /* The capability is not dropped. */ | |
3214 | return !cap_in_list; | |
0769b82a CS |
3215 | } |
3216 | ||
cafcd2a7 | 3217 | static int capabilities_deny(struct lxc_conf *conf) |
81810dd1 | 3218 | { |
20ab7578 | 3219 | struct cap_entry *cap; |
81810dd1 | 3220 | |
20ab7578 | 3221 | list_for_each_entry(cap, &conf->caps.list, head) { |
0fd73091 | 3222 | int ret; |
81810dd1 | 3223 | |
20ab7578 | 3224 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(cap->cap), prctl_arg(0), |
b81689a1 | 3225 | prctl_arg(0), prctl_arg(0)); |
55022530 | 3226 | if (ret < 0) |
cafcd2a7 | 3227 | return syserror("Failed to remove %s capability", cap->cap_name); |
20ab7578 CB |
3228 | |
3229 | DEBUG("Dropped %s (%d) capability", cap->cap_name, cap->cap); | |
81810dd1 DL |
3230 | } |
3231 | ||
0fd73091 | 3232 | DEBUG("Capabilities have been setup"); |
1fb86a7c SH |
3233 | return 0; |
3234 | } | |
3235 | ||
cafcd2a7 | 3236 | static int capabilities_allow(struct lxc_conf *conf) |
1fb86a7c | 3237 | { |
cafcd2a7 | 3238 | __do_free __u32 *keep_bits = NULL; |
7418b27f | 3239 | int ret; |
20ab7578 | 3240 | struct cap_entry *cap; |
7418b27f | 3241 | __u32 last_cap, nr_u32; |
1fb86a7c | 3242 | |
7418b27f CB |
3243 | ret = lxc_caps_last_cap(&last_cap); |
3244 | if (ret || last_cap > 200) | |
20ab7578 | 3245 | return ret_errno(EINVAL); |
1fb86a7c | 3246 | |
7418b27f | 3247 | TRACE("Found %d capabilities", last_cap); |
0fd73091 | 3248 | |
7418b27f | 3249 | nr_u32 = BITS_TO_LONGS(last_cap); |
cafcd2a7 CB |
3250 | keep_bits = zalloc(nr_u32 * sizeof(__u32)); |
3251 | if (!keep_bits) | |
3252 | return ret_errno(ENOMEM); | |
3253 | ||
20ab7578 | 3254 | list_for_each_entry(cap, &conf->caps.list, head) { |
7418b27f | 3255 | if (cap->cap > last_cap) |
cafcd2a7 CB |
3256 | continue; |
3257 | ||
3258 | set_bit(cap->cap, keep_bits); | |
3259 | DEBUG("Keeping %s (%d) capability", cap->cap_name, cap->cap); | |
3260 | } | |
3261 | ||
7418b27f | 3262 | for (__u32 cap_bit = 0; cap_bit <= last_cap; cap_bit++) { |
cafcd2a7 | 3263 | if (is_set(cap_bit, keep_bits)) |
1fb86a7c | 3264 | continue; |
0fd73091 | 3265 | |
cafcd2a7 | 3266 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(cap_bit), prctl_arg(0), |
b81689a1 | 3267 | prctl_arg(0), prctl_arg(0)); |
55022530 | 3268 | if (ret < 0) |
cafcd2a7 | 3269 | return syserror("Failed to remove capability %d", cap_bit); |
20ab7578 | 3270 | |
cafcd2a7 | 3271 | TRACE("Dropped capability %d", cap_bit); |
1fb86a7c SH |
3272 | } |
3273 | ||
0fd73091 | 3274 | DEBUG("Capabilities have been setup"); |
81810dd1 DL |
3275 | return 0; |
3276 | } | |
3277 | ||
0fd73091 CB |
3278 | static int parse_resource(const char *res) |
3279 | { | |
3280 | int ret; | |
c6d09e15 WB |
3281 | size_t i; |
3282 | int resid = -1; | |
3283 | ||
0fd73091 | 3284 | for (i = 0; i < sizeof(limit_opt) / sizeof(limit_opt[0]); ++i) |
71528742 | 3285 | if (strequal(res, limit_opt[i].name)) |
c6d09e15 | 3286 | return limit_opt[i].value; |
c6d09e15 | 3287 | |
0fd73091 | 3288 | /* Try to see if it's numeric, so the user may specify |
c6d09e15 | 3289 | * resources that the running kernel knows about but |
0fd73091 CB |
3290 | * we don't. |
3291 | */ | |
3292 | ret = lxc_safe_int(res, &resid); | |
3293 | if (ret < 0) | |
3294 | return -1; | |
3295 | ||
3296 | return resid; | |
c6d09e15 WB |
3297 | } |
3298 | ||
223797c3 | 3299 | int setup_resource_limits(struct lxc_conf *conf, pid_t pid) |
0fd73091 CB |
3300 | { |
3301 | int resid; | |
c6d09e15 | 3302 | struct lxc_limit *lim; |
c6d09e15 | 3303 | |
223797c3 CB |
3304 | if (list_empty(&conf->limits)) |
3305 | return 0; | |
c6d09e15 | 3306 | |
223797c3 | 3307 | list_for_each_entry(lim, &conf->limits, head) { |
c6d09e15 | 3308 | resid = parse_resource(lim->resource); |
55022530 CB |
3309 | if (resid < 0) |
3310 | return log_error(-1, "Unknown resource %s", lim->resource); | |
c6d09e15 | 3311 | |
f48b5fd8 | 3312 | #if HAVE_PRLIMIT || HAVE_PRLIMIT64 |
55022530 CB |
3313 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) |
3314 | return log_error_errno(-1, errno, "Failed to set limit %s", lim->resource); | |
2de12765 CB |
3315 | |
3316 | TRACE("Setup \"%s\" limit", lim->resource); | |
f48b5fd8 | 3317 | #else |
55022530 | 3318 | return log_error(-1, "Cannot set limit \"%s\" as prlimit is missing", lim->resource); |
f48b5fd8 | 3319 | #endif |
c6d09e15 | 3320 | } |
0fd73091 | 3321 | |
223797c3 | 3322 | TRACE("Setup resource limits"); |
c6d09e15 WB |
3323 | return 0; |
3324 | } | |
3325 | ||
ba9f9347 | 3326 | int setup_sysctl_parameters(struct lxc_conf *conf) |
7edd0540 | 3327 | { |
e6f76452 | 3328 | __do_free char *tmp = NULL; |
0fd73091 | 3329 | int ret = 0; |
6b5a54cd | 3330 | char filename[PATH_MAX] = {0}; |
ba9f9347 | 3331 | struct lxc_sysctl *sysctl, *nsysctl; |
7edd0540 | 3332 | |
1d81fffe | 3333 | if (list_empty(&conf->sysctls)) |
ba9f9347 CB |
3334 | return 0; |
3335 | ||
3336 | list_for_each_entry_safe(sysctl, nsysctl, &conf->sysctls, head) { | |
3337 | tmp = lxc_string_replace(".", "/", sysctl->key); | |
55022530 | 3338 | if (!tmp) |
ba9f9347 | 3339 | return log_error(-1, "Failed to replace key %s", sysctl->key); |
7edd0540 | 3340 | |
9bcde680 CB |
3341 | ret = strnprintf(filename, sizeof(filename), "/proc/sys/%s", tmp); |
3342 | if (ret < 0) | |
55022530 | 3343 | return log_error(-1, "Error setting up sysctl parameters path"); |
7edd0540 | 3344 | |
ba9f9347 CB |
3345 | ret = lxc_write_to_file(filename, sysctl->value, |
3346 | strlen(sysctl->value), false, 0666); | |
55022530 CB |
3347 | if (ret < 0) |
3348 | return log_error_errno(-1, errno, "Failed to setup sysctl parameters %s to %s", | |
ba9f9347 | 3349 | sysctl->key, sysctl->value); |
4e29ef3c CB |
3350 | |
3351 | TRACE("Setting %s to %s", filename, sysctl->value); | |
7edd0540 | 3352 | } |
0fd73091 | 3353 | |
4e29ef3c | 3354 | TRACE("Setup /proc/sys settings"); |
7edd0540 L |
3355 | return 0; |
3356 | } | |
3357 | ||
91d04bf9 | 3358 | int setup_proc_filesystem(struct lxc_conf *conf, pid_t pid) |
61d7a733 | 3359 | { |
0c669152 | 3360 | __do_free char *tmp = NULL; |
0fd73091 | 3361 | int ret = 0; |
6b5a54cd | 3362 | char filename[PATH_MAX] = {0}; |
91d04bf9 CB |
3363 | struct lxc_proc *proc; |
3364 | ||
1d81fffe | 3365 | if (list_empty(&conf->procs)) |
91d04bf9 | 3366 | return 0; |
61d7a733 | 3367 | |
91d04bf9 CB |
3368 | list_for_each_entry(proc, &conf->procs, head) { |
3369 | tmp = lxc_string_replace(".", "/", proc->filename); | |
55022530 | 3370 | if (!tmp) |
91d04bf9 | 3371 | return log_error(-1, "Failed to replace key %s", proc->filename); |
61d7a733 | 3372 | |
9bcde680 CB |
3373 | ret = strnprintf(filename, sizeof(filename), "/proc/%d/%s", pid, tmp); |
3374 | if (ret < 0) | |
55022530 | 3375 | return log_error(-1, "Error setting up proc filesystem path"); |
61d7a733 | 3376 | |
91d04bf9 CB |
3377 | ret = lxc_write_to_file(filename, proc->value, |
3378 | strlen(proc->value), false, 0666); | |
55022530 | 3379 | if (ret < 0) |
91d04bf9 CB |
3380 | return log_error_errno(-1, errno, "Failed to setup proc filesystem %s to %s", |
3381 | proc->filename, proc->value); | |
4e29ef3c CB |
3382 | |
3383 | TRACE("Setting %s to %s", filename, proc->value); | |
61d7a733 | 3384 | } |
0fd73091 | 3385 | |
91d04bf9 | 3386 | TRACE("Setup /proc/%d settings", pid); |
61d7a733 YT |
3387 | return 0; |
3388 | } | |
3389 | ||
ae9242c8 SH |
3390 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
3391 | ||
7b379ab3 | 3392 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 3393 | { |
26ddeedd | 3394 | int i; |
0fd73091 | 3395 | struct lxc_conf *new; |
7b379ab3 | 3396 | |
b8e43ef0 | 3397 | new = zalloc(sizeof(*new)); |
0fd73091 | 3398 | if (!new) |
7b379ab3 | 3399 | return NULL; |
7b379ab3 | 3400 | |
4b73005c | 3401 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
9c601e1f | 3402 | new->personality = LXC_ARCH_UNCHANGED; |
124fa0a8 | 3403 | new->autodev = 1; |
3a784510 | 3404 | new->console.buffer_size = 0; |
596a818d DE |
3405 | new->console.log_path = NULL; |
3406 | new->console.log_fd = -1; | |
861813e5 | 3407 | new->console.log_size = 0; |
28a4b0e5 | 3408 | new->console.path = NULL; |
63376d7d | 3409 | new->console.peer = -1; |
fb87aa6a | 3410 | new->console.proxy.busy = -1; |
36a94ce8 | 3411 | new->console.proxy.ptx = -1; |
41808e20 | 3412 | new->console.proxy.pty = -1; |
f3dff080 CB |
3413 | new->console.ptx = -EBADF; |
3414 | new->console.pty = -EBADF; | |
d926c261 | 3415 | new->console.pty_nr = -1; |
63376d7d | 3416 | new->console.name[0] = '\0'; |
7294a26d | 3417 | new->devpts_fd = -EBADF; |
732375f5 | 3418 | memset(&new->console.ringbuf, 0, sizeof(struct lxc_ringbuf)); |
d2e30e99 | 3419 | new->maincmd_fd = -1; |
258f8051 | 3420 | new->monitor_signal_pdeath = SIGKILL; |
76a26f55 | 3421 | new->nbd_idx = -1; |
54c30e29 | 3422 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 3423 | if (!new->rootfs.mount) { |
53f3f048 SH |
3424 | free(new); |
3425 | return NULL; | |
3426 | } | |
6e54330c | 3427 | new->rootfs.managed = true; |
ea57e424 | 3428 | new->rootfs.dfd_mnt = -EBADF; |
a5a08920 | 3429 | new->rootfs.dfd_dev = -EBADF; |
ea11a215 | 3430 | new->rootfs.dfd_host = -EBADF; |
79ff643d | 3431 | new->rootfs.fd_path_pin = -EBADF; |
4b875ef9 | 3432 | new->rootfs.dfd_idmapped = -EBADF; |
858377e4 | 3433 | new->logfd = -1; |
c9dbb8ed CB |
3434 | INIT_LIST_HEAD(&new->cgroup); |
3435 | INIT_LIST_HEAD(&new->cgroup2); | |
a134099d CB |
3436 | /* Block ("allowlist") all devices by default. */ |
3437 | new->bpf_devices.list_type = LXC_BPF_DEVICE_CGROUP_ALLOWLIST; | |
93de768e | 3438 | INIT_LIST_HEAD(&(new->bpf_devices).devices); |
be0bc4d1 | 3439 | INIT_LIST_HEAD(&new->mount_entries); |
20ab7578 | 3440 | INIT_LIST_HEAD(&new->caps.list); |
0589d744 | 3441 | INIT_LIST_HEAD(&new->id_map); |
46ad64ab CB |
3442 | new->root_nsuid_map = NULL; |
3443 | new->root_nsgid_map = NULL; | |
c294a68d | 3444 | INIT_LIST_HEAD(&new->environment); |
223797c3 | 3445 | INIT_LIST_HEAD(&new->limits); |
ba9f9347 | 3446 | INIT_LIST_HEAD(&new->sysctls); |
91d04bf9 | 3447 | INIT_LIST_HEAD(&new->procs); |
44ae0fb6 | 3448 | new->hooks_version = 0; |
28d9e29e | 3449 | for (i = 0; i < NUM_LXC_HOOKS; i++) |
5090de3e | 3450 | INIT_LIST_HEAD(&new->hooks[i]); |
ffb2a35f | 3451 | INIT_LIST_HEAD(&new->groups); |
d2e75eba | 3452 | INIT_LIST_HEAD(&new->state_clients); |
fe4de9a6 | 3453 | new->lsm_aa_profile = NULL; |
1fb1e667 | 3454 | INIT_LIST_HEAD(&new->lsm_aa_raw); |
fe4de9a6 | 3455 | new->lsm_se_context = NULL; |
4fef78bc | 3456 | new->lsm_se_keyring_context = NULL; |
8f818a84 | 3457 | new->keyring_disable_session = false; |
952b5031 | 3458 | new->transient_procfs_mnt = false; |
7a41e857 LT |
3459 | new->shmount.path_host = NULL; |
3460 | new->shmount.path_cont = NULL; | |
09996a48 CB |
3461 | new->sched_core = false; |
3462 | new->sched_core_cookie = INVALID_SCHED_CORE_COOKIE; | |
7b379ab3 | 3463 | |
72bb04e4 PT |
3464 | /* if running in a new user namespace, init and COMMAND |
3465 | * default to running as UID/GID 0 when using lxc-execute */ | |
3466 | new->init_uid = 0; | |
3467 | new->init_gid = 0; | |
c71f64cb | 3468 | memset(&new->init_groups, 0, sizeof(lxc_groups_t)); |
43654d34 | 3469 | memset(&new->cgroup_meta, 0, sizeof(struct lxc_cgroup)); |
b074bbf1 | 3470 | memset(&new->ns_share, 0, sizeof(char *) * LXC_NS_MAX); |
70fd7fc9 | 3471 | memset(&new->timens, 0, sizeof(struct timens_offsets)); |
c3e3c21a | 3472 | seccomp_conf_init(new); |
72bb04e4 | 3473 | |
87d0990c CB |
3474 | INIT_LIST_HEAD(&new->netdevs); |
3475 | ||
7b379ab3 | 3476 | return new; |
089cd8b8 DL |
3477 | } |
3478 | ||
344c9d81 | 3479 | int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
a19b974f | 3480 | size_t buf_size) |
f6d3e3e4 | 3481 | { |
f62cf1d4 | 3482 | __do_close int fd = -EBADF; |
76bcd422 | 3483 | int ret; |
6b5a54cd | 3484 | char path[PATH_MAX]; |
f6d3e3e4 | 3485 | |
a19b974f | 3486 | if (geteuid() != 0 && idtype == ID_TYPE_GID) { |
f62cf1d4 | 3487 | __do_close int setgroups_fd = -EBADF; |
a19b974f | 3488 | |
9bcde680 CB |
3489 | ret = strnprintf(path, sizeof(path), "/proc/%d/setgroups", pid); |
3490 | if (ret < 0) | |
a19b974f | 3491 | return -E2BIG; |
a19b974f | 3492 | |
76bcd422 | 3493 | setgroups_fd = open(path, O_WRONLY); |
55022530 CB |
3494 | if (setgroups_fd < 0 && errno != ENOENT) |
3495 | return log_error_errno(-1, errno, "Failed to open \"%s\"", path); | |
a19b974f | 3496 | |
76bcd422 CB |
3497 | if (setgroups_fd >= 0) { |
3498 | ret = lxc_write_nointr(setgroups_fd, "deny\n", | |
3499 | STRLITERALLEN("deny\n")); | |
55022530 CB |
3500 | if (ret != STRLITERALLEN("deny\n")) |
3501 | return log_error_errno(-1, errno, "Failed to write \"deny\" to \"/proc/%d/setgroups\"", pid); | |
395b1a3e | 3502 | TRACE("Wrote \"deny\" to \"/proc/%d/setgroups\"", pid); |
a19b974f | 3503 | } |
a19b974f CB |
3504 | } |
3505 | ||
9bcde680 | 3506 | ret = strnprintf(path, sizeof(path), "/proc/%d/%cid_map", pid, |
29053180 | 3507 | idtype == ID_TYPE_UID ? 'u' : 'g'); |
9bcde680 | 3508 | if (ret < 0) |
f6d3e3e4 | 3509 | return -E2BIG; |
29053180 | 3510 | |
55022530 CB |
3511 | fd = open(path, O_WRONLY | O_CLOEXEC); |
3512 | if (fd < 0) | |
3513 | return log_error_errno(-1, errno, "Failed to open \"%s\"", path); | |
29053180 | 3514 | |
29053180 | 3515 | ret = lxc_write_nointr(fd, buf, buf_size); |
02d477cc | 3516 | if (ret < 0 || (size_t)ret != buf_size) |
55022530 CB |
3517 | return log_error_errno(-1, errno, "Failed to write %cid mapping to \"%s\"", |
3518 | idtype == ID_TYPE_UID ? 'u' : 'g', path); | |
29053180 CB |
3519 | |
3520 | return 0; | |
f6d3e3e4 SH |
3521 | } |
3522 | ||
6e50e704 CB |
3523 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
3524 | * | |
3525 | * @return 1 if functional binary was found | |
3526 | * @return 0 if binary exists but is lacking privilege | |
3527 | * @return -ENOENT if binary does not exist | |
3528 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
6e50e704 | 3529 | */ |
df6a2945 CB |
3530 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
3531 | { | |
48411df2 | 3532 | __do_free char *path = NULL; |
df6a2945 CB |
3533 | int ret; |
3534 | struct stat st; | |
df6a2945 | 3535 | |
6e50e704 | 3536 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
83cb7362 | 3537 | return ret_errno(EINVAL); |
6e50e704 | 3538 | |
df6a2945 CB |
3539 | path = on_path(binary, NULL); |
3540 | if (!path) | |
83cb7362 | 3541 | return ret_errno(ENOENT); |
df6a2945 CB |
3542 | |
3543 | ret = stat(path, &st); | |
3275932b | 3544 | if (ret < 0) |
83cb7362 | 3545 | return -errno; |
df6a2945 CB |
3546 | |
3547 | /* Check if the binary is setuid. */ | |
55022530 CB |
3548 | if (st.st_mode & S_ISUID) |
3549 | return log_debug(1, "The binary \"%s\" does have the setuid bit set", path); | |
df6a2945 | 3550 | |
0fd73091 | 3551 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
3552 | /* Check if it has the CAP_SETUID capability. */ |
3553 | if ((cap & CAP_SETUID) && | |
3554 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
55022530 CB |
3555 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) |
3556 | return log_debug(1, "The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE and CAP_PERMITTED sets", path); | |
df6a2945 CB |
3557 | |
3558 | /* Check if it has the CAP_SETGID capability. */ | |
3559 | if ((cap & CAP_SETGID) && | |
3560 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
55022530 CB |
3561 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) |
3562 | return log_debug(1, "The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE and CAP_PERMITTED sets", path); | |
a864a2e1 CB |
3563 | |
3564 | return 0; | |
0fd73091 | 3565 | #else |
83cb7362 CB |
3566 | /* |
3567 | * If we cannot check for file capabilities we need to give the benefit | |
69924fff CB |
3568 | * of the doubt. Otherwise we might fail even though all the necessary |
3569 | * file capabilities are set. | |
3570 | */ | |
55022530 | 3571 | DEBUG("Cannot check for file capabilities as full capability support is missing. Manual intervention needed"); |
3275932b | 3572 | return 1; |
a864a2e1 | 3573 | #endif |
df6a2945 CB |
3574 | } |
3575 | ||
59eac805 | 3576 | static int lxc_map_ids_exec_wrapper(void *args) |
986ef930 CB |
3577 | { |
3578 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
3579 | return -1; | |
3580 | } | |
3581 | ||
0589d744 | 3582 | static struct id_map *find_mapped_hostid_entry(const struct list_head *idmap, |
86c78011 CB |
3583 | unsigned id, enum idtype idtype); |
3584 | ||
0589d744 | 3585 | int lxc_map_ids(struct list_head *idmap, pid_t pid) |
f6d3e3e4 | 3586 | { |
02d477cc CB |
3587 | int fill, left; |
3588 | uid_t hostuid; | |
3589 | gid_t hostgid; | |
986ef930 | 3590 | char u_or_g; |
4bc3b759 | 3591 | char *pos; |
6b5a54cd | 3592 | char cmd_output[PATH_MAX]; |
0fd73091 | 3593 | struct id_map *map; |
0fd73091 | 3594 | enum idtype type; |
0fd73091 | 3595 | int ret = 0, gidmap = 0, uidmap = 0; |
c6ba8981 CB |
3596 | char mapbuf[STRLITERALLEN("new@idmap") + STRLITERALLEN(" ") + |
3597 | INTTYPE_TO_STRLEN(pid_t) + STRLITERALLEN(" ") + | |
3598 | LXC_IDMAPLEN] = {0}; | |
86c78011 | 3599 | bool had_entry = false, maps_host_root = false, use_shadow = false; |
c724025c JC |
3600 | |
3601 | hostuid = geteuid(); | |
3602 | hostgid = getegid(); | |
df6a2945 | 3603 | |
86c78011 CB |
3604 | /* |
3605 | * Check whether caller wants to map host root. | |
3606 | * Due to a security fix newer kernels require CAP_SETFCAP when mapping | |
3607 | * host root into the child userns as you would be able to write fscaps | |
3608 | * that would be valid in the ancestor userns. Mapping host root should | |
3609 | * rarely be the case but LXC is being clever in a bunch of cases. | |
3610 | */ | |
3611 | if (find_mapped_hostid_entry(idmap, 0, ID_TYPE_UID)) | |
3612 | maps_host_root = true; | |
3613 | ||
df6a2945 CB |
3614 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid |
3615 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
3616 | * will protected it by preventing another user from being handed the |
3617 | * range by shadow. | |
3618 | */ | |
df6a2945 | 3619 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
3620 | if (uidmap == -ENOENT) |
3621 | WARN("newuidmap binary is missing"); | |
3622 | else if (!uidmap) | |
3623 | WARN("newuidmap is lacking necessary privileges"); | |
3624 | ||
df6a2945 | 3625 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
3626 | if (gidmap == -ENOENT) |
3627 | WARN("newgidmap binary is missing"); | |
3628 | else if (!gidmap) | |
3629 | WARN("newgidmap is lacking necessary privileges"); | |
3630 | ||
86c78011 CB |
3631 | if (maps_host_root) { |
3632 | INFO("Caller maps host root. Writing mapping directly"); | |
3633 | } else if (uidmap > 0 && gidmap > 0) { | |
0fd73091 | 3634 | DEBUG("Functional newuidmap and newgidmap binary found"); |
4bc3b759 | 3635 | use_shadow = true; |
df6a2945 | 3636 | } else { |
99d43365 CB |
3637 | /* In case unprivileged users run application containers via |
3638 | * execute() or a start*() there are valid cases where they may | |
3639 | * only want to map their own {g,u}id. Let's not block them from | |
3640 | * doing so by requiring geteuid() == 0. | |
3641 | */ | |
3642 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
c724025c JC |
3643 | "write directly with euid %d", hostuid); |
3644 | } | |
3645 | ||
3646 | /* Check if we really need to use newuidmap and newgidmap. | |
f48e8071 | 3647 | * If the user is only remapping their own {g,u}id, we don't need it. |
c724025c | 3648 | */ |
d696c45e | 3649 | if (use_shadow && list_len(map, idmap, head) == 2) { |
c724025c | 3650 | use_shadow = false; |
0589d744 | 3651 | list_for_each_entry(map, idmap, head) { |
c724025c JC |
3652 | if (map->idtype == ID_TYPE_UID && map->range == 1 && |
3653 | map->nsid == hostuid && map->hostid == hostuid) | |
3654 | continue; | |
3655 | if (map->idtype == ID_TYPE_GID && map->range == 1 && | |
3656 | map->nsid == hostgid && map->hostid == hostgid) | |
3657 | continue; | |
3658 | use_shadow = true; | |
3659 | break; | |
3660 | } | |
0e6e3a41 | 3661 | } |
251d0d2a | 3662 | |
986ef930 CB |
3663 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
3664 | type++, u_or_g = 'g') { | |
3665 | pos = mapbuf; | |
3666 | ||
0e6e3a41 | 3667 | if (use_shadow) |
986ef930 | 3668 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 3669 | |
0589d744 | 3670 | list_for_each_entry(map, idmap, head) { |
cf3ef16d SH |
3671 | if (map->idtype != type) |
3672 | continue; | |
3673 | ||
4bc3b759 CB |
3674 | had_entry = true; |
3675 | ||
986ef930 | 3676 | left = LXC_IDMAPLEN - (pos - mapbuf); |
9bcde680 | 3677 | fill = strnprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
3678 | use_shadow ? " " : "", map->nsid, |
3679 | map->hostid, map->range, | |
0e6e3a41 | 3680 | use_shadow ? "" : "\n"); |
55022530 CB |
3681 | /* |
3682 | * The kernel only takes <= 4k for writes to | |
3683 | * /proc/<pid>/{g,u}id_map | |
3684 | */ | |
9bcde680 | 3685 | if (fill <= 0) |
55022530 | 3686 | return log_error_errno(-1, errno, "Too many %cid mappings defined", u_or_g); |
4bc3b759 | 3687 | |
cf3ef16d | 3688 | pos += fill; |
251d0d2a | 3689 | } |
cf3ef16d | 3690 | if (!had_entry) |
4f7521b4 | 3691 | continue; |
cf3ef16d | 3692 | |
d85813cd | 3693 | /* Try to catch the output of new{g,u}idmap to make debugging |
986ef930 CB |
3694 | * easier. |
3695 | */ | |
3696 | if (use_shadow) { | |
3697 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3698 | lxc_map_ids_exec_wrapper, | |
3699 | (void *)mapbuf); | |
55022530 CB |
3700 | if (ret < 0) |
3701 | return log_error(-1, "new%cidmap failed to write mapping \"%s\": %s", u_or_g, cmd_output, mapbuf); | |
54fbbeb5 | 3702 | TRACE("new%cidmap wrote mapping \"%s\"", u_or_g, mapbuf); |
d1838f34 | 3703 | } else { |
986ef930 | 3704 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
55022530 CB |
3705 | if (ret < 0) |
3706 | return log_error(-1, "Failed to write mapping: %s", mapbuf); | |
54fbbeb5 | 3707 | TRACE("Wrote mapping \"%s\"", mapbuf); |
d1838f34 | 3708 | } |
986ef930 CB |
3709 | |
3710 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 3711 | } |
251d0d2a | 3712 | |
986ef930 | 3713 | return 0; |
f6d3e3e4 SH |
3714 | } |
3715 | ||
234998b4 CB |
3716 | /* |
3717 | * Return the host uid/gid to which the container root is mapped in val. | |
0b3a6504 | 3718 | * Return true if id was found, false otherwise. |
cf3ef16d | 3719 | */ |
234998b4 | 3720 | static id_t get_mapped_rootid(const struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3721 | { |
4160c3a0 | 3722 | unsigned nsid; |
0fd73091 | 3723 | struct id_map *map; |
4160c3a0 CB |
3724 | |
3725 | if (idtype == ID_TYPE_UID) | |
3726 | nsid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; | |
3727 | else | |
3728 | nsid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
cf3ef16d | 3729 | |
0589d744 | 3730 | list_for_each_entry (map, &conf->id_map, head) { |
7b50c609 | 3731 | if (map->idtype != idtype) |
cf3ef16d | 3732 | continue; |
4160c3a0 | 3733 | if (map->nsid != nsid) |
cf3ef16d | 3734 | continue; |
234998b4 | 3735 | return map->hostid; |
cf3ef16d | 3736 | } |
4160c3a0 | 3737 | |
234998b4 CB |
3738 | if (idtype == ID_TYPE_UID) |
3739 | return LXC_INVALID_UID; | |
3740 | ||
3741 | return LXC_INVALID_GID; | |
cf3ef16d SH |
3742 | } |
3743 | ||
facdf925 | 3744 | int mapped_hostid(unsigned id, const struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3745 | { |
cf3ef16d | 3746 | struct id_map *map; |
0fd73091 | 3747 | |
0589d744 | 3748 | list_for_each_entry(map, &conf->id_map, head) { |
2133f58c | 3749 | if (map->idtype != idtype) |
cf3ef16d | 3750 | continue; |
0fd73091 | 3751 | |
cf3ef16d | 3752 | if (id >= map->hostid && id < map->hostid + map->range) |
57d116ab | 3753 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 3754 | } |
0fd73091 | 3755 | |
57d116ab | 3756 | return -1; |
cf3ef16d SH |
3757 | } |
3758 | ||
7581a82f | 3759 | int find_unmapped_nsid(const struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3760 | { |
cf3ef16d | 3761 | struct id_map *map; |
2133f58c | 3762 | unsigned int freeid = 0; |
0fd73091 | 3763 | |
cf3ef16d | 3764 | again: |
0589d744 | 3765 | list_for_each_entry(map, &conf->id_map, head) { |
2133f58c | 3766 | if (map->idtype != idtype) |
cf3ef16d | 3767 | continue; |
0fd73091 | 3768 | |
cf3ef16d SH |
3769 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { |
3770 | freeid = map->nsid + map->range; | |
3771 | goto again; | |
3772 | } | |
3773 | } | |
0fd73091 | 3774 | |
cf3ef16d SH |
3775 | return freeid; |
3776 | } | |
3777 | ||
e1b9d6af CB |
3778 | /* |
3779 | * Mount a proc under @rootfs if proc self points to a pid other than | |
3780 | * my own. This is needed to have a known-good proc mount for setting | |
3781 | * up LSMs both at container startup and attach. | |
3782 | * | |
e1b9d6af CB |
3783 | * NOTE: not to be called from inside the container namespace! |
3784 | */ | |
952b5031 | 3785 | static int lxc_transient_proc(struct lxc_rootfs *rootfs) |
e1b9d6af | 3786 | { |
952b5031 CB |
3787 | __do_close int fd_proc = -EBADF; |
3788 | int link_to_pid, link_len, pid_self, ret; | |
3789 | char link[INTTYPE_TO_STRLEN(pid_t) + 1]; | |
e1b9d6af | 3790 | |
ea57e424 | 3791 | link_len = readlinkat(rootfs->dfd_mnt, "proc/self", link, sizeof(link)); |
952b5031 | 3792 | if (link_len < 0) { |
ea57e424 | 3793 | ret = mkdirat(rootfs->dfd_mnt, "proc", 0000); |
952b5031 | 3794 | if (ret < 0 && errno != EEXIST) |
ea57e424 | 3795 | return log_error_errno(-errno, errno, "Failed to create %d(proc)", rootfs->dfd_mnt); |
e1b9d6af | 3796 | |
952b5031 | 3797 | goto domount; |
02d477cc | 3798 | } else if ((size_t)link_len >= sizeof(link)) { |
952b5031 | 3799 | return log_error_errno(-EIO, EIO, "Truncated link target"); |
e1b9d6af | 3800 | } |
952b5031 | 3801 | link[link_len] = '\0'; |
e1b9d6af | 3802 | |
952b5031 CB |
3803 | pid_self = lxc_raw_getpid(); |
3804 | INFO("Caller's PID is %d; /proc/self points to %s", pid_self, link); | |
e1b9d6af | 3805 | |
952b5031 CB |
3806 | ret = lxc_safe_int(link, &link_to_pid); |
3807 | if (ret) | |
3808 | return log_error_errno(-ret, ret, "Failed to parse %s", link); | |
e1b9d6af | 3809 | |
952b5031 CB |
3810 | /* Correct procfs is already mounted. */ |
3811 | if (link_to_pid == pid_self) | |
3812 | return log_trace(0, "Correct procfs instance mounted"); | |
e1b9d6af | 3813 | |
ea57e424 | 3814 | fd_proc = open_at(rootfs->dfd_mnt, "proc", PROTECT_OPATH_DIRECTORY, |
952b5031 CB |
3815 | PROTECT_LOOKUP_BENEATH_XDEV, 0); |
3816 | if (fd_proc < 0) | |
3817 | return log_error_errno(-errno, errno, "Failed to open transient procfs mountpoint"); | |
e1b9d6af | 3818 | |
9bcde680 CB |
3819 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "/proc/self/fd/%d", fd_proc); |
3820 | if (ret < 0) | |
952b5031 | 3821 | return ret_errno(EIO); |
e1b9d6af | 3822 | |
952b5031 | 3823 | ret = umount2(rootfs->buf, MNT_DETACH); |
e1b9d6af | 3824 | if (ret < 0) |
952b5031 | 3825 | SYSWARN("Failed to umount \"%s\" with MNT_DETACH", rootfs->buf); |
e1b9d6af CB |
3826 | |
3827 | domount: | |
3828 | /* rootfs is NULL */ | |
952b5031 CB |
3829 | if (!rootfs->path) { |
3830 | ret = mount("proc", rootfs->buf, "proc", 0, NULL); | |
3831 | } else { | |
ea57e424 | 3832 | ret = safe_mount_beneath_at(rootfs->dfd_mnt, "none", "proc", "proc", 0, NULL); |
952b5031 | 3833 | if (ret < 0) { |
9bcde680 CB |
3834 | ret = strnprintf(rootfs->buf, sizeof(rootfs->buf), "%s/proc", rootfs->path ? rootfs->mount : ""); |
3835 | if (ret < 0) | |
952b5031 CB |
3836 | return ret_errno(EIO); |
3837 | ||
3838 | ret = safe_mount("proc", rootfs->buf, "proc", 0, NULL, rootfs->mount); | |
3839 | } | |
3840 | } | |
e1b9d6af | 3841 | if (ret < 0) |
952b5031 | 3842 | return log_error_errno(-1, errno, "Failed to mount temporary procfs"); |
e1b9d6af | 3843 | |
952b5031 | 3844 | INFO("Created transient procfs mount"); |
e1b9d6af CB |
3845 | return 1; |
3846 | } | |
3847 | ||
943144d9 | 3848 | /* NOTE: Must not be called from inside the container namespace! */ |
59eac805 | 3849 | static int lxc_create_tmp_proc_mount(struct lxc_conf *conf) |
5112cd70 SH |
3850 | { |
3851 | int mounted; | |
3852 | ||
952b5031 | 3853 | mounted = lxc_transient_proc(&conf->rootfs); |
5112cd70 | 3854 | if (mounted == -1) { |
01958b1f | 3855 | /* continue only if there is no rootfs */ |
943144d9 | 3856 | if (conf->rootfs.path) |
952b5031 | 3857 | return log_error_errno(-EPERM, EPERM, "Failed to create transient procfs mount"); |
5112cd70 | 3858 | } else if (mounted == 1) { |
952b5031 | 3859 | conf->transient_procfs_mnt = true; |
5112cd70 | 3860 | } |
943144d9 | 3861 | |
5112cd70 SH |
3862 | return 0; |
3863 | } | |
3864 | ||
3865 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3866 | { | |
952b5031 CB |
3867 | if (lxc_conf->transient_procfs_mnt) { |
3868 | (void)umount2("/proc", MNT_DETACH); | |
3869 | lxc_conf->transient_procfs_mnt = false; | |
3870 | } | |
5112cd70 SH |
3871 | } |
3872 | ||
9e61fb1f | 3873 | /* Walk /proc/mounts and change any shared entries to dependent mounts. */ |
ed41e764 | 3874 | static void turn_into_dependent_mounts(const struct lxc_rootfs *rootfs) |
e995d7a2 | 3875 | { |
7969675f | 3876 | __do_free char *line = NULL; |
003be47b | 3877 | __do_fclose FILE *f = NULL; |
f62cf1d4 | 3878 | __do_close int memfd = -EBADF, mntinfo_fd = -EBADF; |
e995d7a2 | 3879 | size_t len = 0; |
a39fc34b CB |
3880 | ssize_t copied; |
3881 | int ret; | |
e995d7a2 | 3882 | |
ed41e764 CB |
3883 | mntinfo_fd = open_at(rootfs->dfd_host, "proc/self/mountinfo", PROTECT_OPEN, |
3884 | (PROTECT_LOOKUP_BENEATH_XDEV & ~RESOLVE_NO_SYMLINKS), 0); | |
fea3b91d | 3885 | if (mntinfo_fd < 0) { |
ed41e764 | 3886 | SYSERROR("Failed to open %d/proc/self/mountinfo", rootfs->dfd_host); |
6a49f05e | 3887 | return; |
fea3b91d | 3888 | } |
6a49f05e CB |
3889 | |
3890 | memfd = memfd_create(".lxc_mountinfo", MFD_CLOEXEC); | |
3891 | if (memfd < 0) { | |
3892 | char template[] = P_tmpdir "/.lxc_mountinfo_XXXXXX"; | |
3893 | ||
3894 | if (errno != ENOSYS) { | |
fea3b91d | 3895 | SYSERROR("Failed to create temporary in-memory file"); |
6a49f05e CB |
3896 | return; |
3897 | } | |
3898 | ||
3899 | memfd = lxc_make_tmpfile(template, true); | |
fea3b91d | 3900 | if (memfd < 0) { |
fea3b91d DJ |
3901 | WARN("Failed to create temporary file"); |
3902 | return; | |
3903 | } | |
6a49f05e CB |
3904 | } |
3905 | ||
a39fc34b | 3906 | copied = fd_to_fd(mntinfo_fd, memfd); |
6a49f05e | 3907 | if (copied < 0) { |
fea3b91d | 3908 | SYSERROR("Failed to copy \"/proc/self/mountinfo\""); |
6a49f05e CB |
3909 | return; |
3910 | } | |
6a49f05e | 3911 | |
6a49f05e CB |
3912 | ret = lseek(memfd, 0, SEEK_SET); |
3913 | if (ret < 0) { | |
fea3b91d | 3914 | SYSERROR("Failed to reset file descriptor offset"); |
6a49f05e CB |
3915 | return; |
3916 | } | |
3917 | ||
4110345b | 3918 | f = fdopen(memfd, "re"); |
e995d7a2 | 3919 | if (!f) { |
003be47b | 3920 | SYSERROR("Failed to open copy of \"/proc/self/mountinfo\" to mark all shared. Continuing"); |
e995d7a2 SH |
3921 | return; |
3922 | } | |
3923 | ||
003be47b CB |
3924 | /* |
3925 | * After a successful fdopen() memfd will be closed when calling | |
3926 | * fclose(f). Calling close(memfd) afterwards is undefined. | |
3927 | */ | |
3928 | move_fd(memfd); | |
3929 | ||
e995d7a2 | 3930 | while (getline(&line, &len, f) != -1) { |
0fd73091 CB |
3931 | char *opts, *target; |
3932 | ||
e995d7a2 SH |
3933 | target = get_field(line, 4); |
3934 | if (!target) | |
3935 | continue; | |
0fd73091 | 3936 | |
e995d7a2 SH |
3937 | opts = get_field(target, 2); |
3938 | if (!opts) | |
3939 | continue; | |
0fd73091 | 3940 | |
e995d7a2 SH |
3941 | null_endofword(opts); |
3942 | if (!strstr(opts, "shared")) | |
3943 | continue; | |
0fd73091 | 3944 | |
e995d7a2 | 3945 | null_endofword(target); |
0fd73091 CB |
3946 | ret = mount(NULL, target, NULL, MS_SLAVE, NULL); |
3947 | if (ret < 0) { | |
9e61fb1f | 3948 | SYSERROR("Failed to recursively turn old root mount tree into dependent mount. Continuing..."); |
6a49f05e | 3949 | continue; |
e995d7a2 SH |
3950 | } |
3951 | } | |
9e61fb1f | 3952 | TRACE("Turned all mount table entries into dependent mount"); |
e995d7a2 SH |
3953 | } |
3954 | ||
0fd73091 CB |
3955 | /* This does the work of remounting / if it is shared, calling the container |
3956 | * pre-mount hooks, and mounting the rootfs. | |
35120d9c | 3957 | */ |
8ce1abc2 CB |
3958 | int lxc_setup_rootfs_prepare_root(struct lxc_conf *conf, const char *name, |
3959 | const char *lxcpath) | |
0ad19a3f | 3960 | { |
0fd73091 CB |
3961 | int ret; |
3962 | ||
ea11a215 CB |
3963 | conf->rootfs.dfd_host = open_at(-EBADF, "/", PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_ABSOLUTE, 0); |
3964 | if (conf->rootfs.dfd_host < 0) | |
a370f16b CB |
3965 | return log_error_errno(-errno, errno, "Failed to open \"/\""); |
3966 | ||
ed41e764 CB |
3967 | turn_into_dependent_mounts(&conf->rootfs); |
3968 | ||
35120d9c | 3969 | if (conf->rootfs_setup) { |
35120d9c | 3970 | const char *path = conf->rootfs.mount; |
0fd73091 | 3971 | |
ed41e764 CB |
3972 | /* |
3973 | * The rootfs was set up in another namespace. bind-mount it to | |
0fd73091 CB |
3974 | * give us a mount in our own ns so we can pivot_root to it |
3975 | */ | |
3976 | ret = mount(path, path, "rootfs", MS_BIND, NULL); | |
55022530 CB |
3977 | if (ret < 0) |
3978 | return log_error(-1, "Failed to bind mount container / onto itself"); | |
0fd73091 | 3979 | |
ea57e424 CB |
3980 | conf->rootfs.dfd_mnt = openat(-EBADF, path, O_RDONLY | O_CLOEXEC | O_DIRECTORY | O_PATH | O_NOCTTY); |
3981 | if (conf->rootfs.dfd_mnt < 0) | |
26ea5533 CB |
3982 | return log_error_errno(-errno, errno, "Failed to open file descriptor for container rootfs"); |
3983 | ||
55022530 | 3984 | return log_trace(0, "Bind mounted container / onto itself"); |
35120d9c | 3985 | } |
d4ef7c50 | 3986 | |
0fd73091 | 3987 | ret = run_lxc_hooks(name, "pre-mount", conf, NULL); |
55022530 CB |
3988 | if (ret < 0) |
3989 | return log_error(-1, "Failed to run pre-mount hooks"); | |
35120d9c | 3990 | |
4e86cad3 | 3991 | ret = lxc_mount_rootfs(&conf->rootfs); |
55022530 CB |
3992 | if (ret < 0) |
3993 | return log_error(-1, "Failed to setup rootfs for"); | |
35120d9c SH |
3994 | |
3995 | conf->rootfs_setup = true; | |
3996 | return 0; | |
3997 | } | |
3998 | ||
1c1c7051 SH |
3999 | static bool verify_start_hooks(struct lxc_conf *conf) |
4000 | { | |
6b5a54cd | 4001 | char path[PATH_MAX]; |
5090de3e | 4002 | struct string_entry *hook; |
0fd73091 | 4003 | |
5090de3e | 4004 | list_for_each_entry(hook, &conf->hooks[LXCHOOK_START], head) { |
1c1c7051 | 4005 | int ret; |
5090de3e | 4006 | char *hookname = hook->val; |
1c1c7051 | 4007 | |
9bcde680 | 4008 | ret = strnprintf(path, sizeof(path), "%s%s", |
0fd73091 CB |
4009 | conf->rootfs.path ? conf->rootfs.mount : "", |
4010 | hookname); | |
9bcde680 | 4011 | if (ret < 0) |
1c1c7051 | 4012 | return false; |
0fd73091 | 4013 | |
75193660 | 4014 | ret = access(path, X_OK); |
55022530 CB |
4015 | if (ret < 0) |
4016 | return log_error_errno(false, errno, "Start hook \"%s\" not found in container", hookname); | |
0fd73091 | 4017 | |
6a0c909a | 4018 | return true; |
1c1c7051 SH |
4019 | } |
4020 | ||
4021 | return true; | |
4022 | } | |
4023 | ||
20502652 CB |
4024 | static int lxc_setup_boot_id(void) |
4025 | { | |
4026 | int ret; | |
4027 | const char *boot_id_path = "/proc/sys/kernel/random/boot_id"; | |
4028 | const char *mock_boot_id_path = "/dev/.lxc-boot-id"; | |
4029 | lxc_id128_t n; | |
4030 | ||
4031 | if (access(boot_id_path, F_OK)) | |
4032 | return 0; | |
4033 | ||
4034 | memset(&n, 0, sizeof(n)); | |
4035 | if (lxc_id128_randomize(&n)) { | |
4036 | SYSERROR("Failed to generate random data for uuid"); | |
4037 | return -1; | |
4038 | } | |
4039 | ||
4040 | ret = lxc_id128_write(mock_boot_id_path, n); | |
4041 | if (ret < 0) { | |
4042 | SYSERROR("Failed to write uuid to %s", mock_boot_id_path); | |
4043 | return -1; | |
4044 | } | |
4045 | ||
4046 | ret = chmod(mock_boot_id_path, 0444); | |
4047 | if (ret < 0) { | |
4048 | SYSERROR("Failed to chown %s", mock_boot_id_path); | |
4049 | (void)unlink(mock_boot_id_path); | |
4050 | return -1; | |
4051 | } | |
4052 | ||
4053 | ret = mount(mock_boot_id_path, boot_id_path, NULL, MS_BIND, NULL); | |
4054 | if (ret < 0) { | |
4055 | SYSERROR("Failed to mount %s to %s", mock_boot_id_path, | |
4056 | boot_id_path); | |
4057 | (void)unlink(mock_boot_id_path); | |
4058 | return -1; | |
4059 | } | |
4060 | ||
4061 | ret = mount(NULL, boot_id_path, NULL, | |
4062 | (MS_BIND | MS_REMOUNT | MS_RDONLY | MS_NOSUID | MS_NOEXEC | | |
4063 | MS_NODEV), | |
4064 | NULL); | |
4065 | if (ret < 0) { | |
4066 | SYSERROR("Failed to remount %s read-only", boot_id_path); | |
4067 | (void)unlink(mock_boot_id_path); | |
4068 | return -1; | |
4069 | } | |
4070 | ||
4071 | return 0; | |
4072 | } | |
4073 | ||
af04d847 | 4074 | static int lxc_setup_keyring(struct lsm_ops *lsm_ops, const struct lxc_conf *conf) |
d701d729 CB |
4075 | { |
4076 | key_serial_t keyring; | |
4077 | int ret = 0; | |
4078 | ||
4079 | if (conf->lsm_se_keyring_context) | |
af04d847 | 4080 | ret = lsm_ops->keyring_label_set(lsm_ops, conf->lsm_se_keyring_context); |
d701d729 | 4081 | else if (conf->lsm_se_context) |
af04d847 | 4082 | ret = lsm_ops->keyring_label_set(lsm_ops, conf->lsm_se_context); |
d701d729 | 4083 | if (ret < 0) |
d2022f30 | 4084 | return syserror("Failed to set keyring context"); |
d701d729 CB |
4085 | |
4086 | /* | |
4087 | * Try to allocate a new session keyring for the container to prevent | |
4088 | * information leaks. | |
4089 | */ | |
4090 | keyring = keyctl(KEYCTL_JOIN_SESSION_KEYRING, prctl_arg(0), | |
4091 | prctl_arg(0), prctl_arg(0), prctl_arg(0)); | |
4092 | if (keyring < 0) { | |
4093 | switch (errno) { | |
4094 | case ENOSYS: | |
4095 | DEBUG("The keyctl() syscall is not supported or blocked"); | |
4096 | break; | |
4097 | case EACCES: | |
4098 | __fallthrough; | |
4099 | case EPERM: | |
4100 | DEBUG("Failed to access kernel keyring. Continuing..."); | |
4101 | break; | |
4102 | default: | |
d2022f30 | 4103 | SYSWARN("Failed to create kernel keyring"); |
d701d729 CB |
4104 | break; |
4105 | } | |
4106 | } | |
4107 | ||
4108 | return ret; | |
4109 | } | |
4110 | ||
4b875ef9 CB |
4111 | static int lxc_rootfs_prepare_child(struct lxc_handler *handler) |
4112 | { | |
4113 | struct lxc_rootfs *rootfs = &handler->conf->rootfs; | |
4114 | int dfd_idmapped = -EBADF; | |
4115 | int ret; | |
4116 | ||
0589d744 | 4117 | if (list_empty(&handler->conf->id_map)) |
4b875ef9 CB |
4118 | return 0; |
4119 | ||
4120 | if (is_empty_string(rootfs->mnt_opts.userns_path)) | |
4121 | return 0; | |
4122 | ||
4123 | if (handler->conf->rootfs_setup) | |
4124 | return 0; | |
4125 | ||
4126 | ret = lxc_abstract_unix_recv_one_fd(handler->data_sock[1], &dfd_idmapped, NULL, 0); | |
4127 | if (ret < 0) | |
4128 | return syserror("Failed to receive idmapped mount fd"); | |
4129 | ||
4130 | rootfs->dfd_idmapped = dfd_idmapped; | |
4131 | TRACE("Received detached idmapped mount %d", rootfs->dfd_idmapped); | |
4132 | return 0; | |
4133 | } | |
4134 | ||
1b82d721 CB |
4135 | int lxc_idmapped_mounts_parent(struct lxc_handler *handler) |
4136 | { | |
5a782dca CB |
4137 | int mnt_seq = 0; |
4138 | ||
1b82d721 CB |
4139 | for (;;) { |
4140 | __do_close int fd_from = -EBADF, fd_userns = -EBADF; | |
c1115e15 | 4141 | struct mount_attr attr = {}; |
1b82d721 CB |
4142 | struct lxc_mount_options opts = {}; |
4143 | ssize_t ret; | |
4144 | ||
4145 | ret = __lxc_abstract_unix_recv_two_fds(handler->data_sock[1], | |
4146 | &fd_from, &fd_userns, | |
4147 | &opts, sizeof(opts)); | |
4148 | if (ret < 0) | |
4149 | return syserror("Failed to receive idmapped mount file descriptors from child"); | |
4150 | ||
4151 | if (fd_from < 0 || fd_userns < 0) | |
fc133a9f | 4152 | return log_trace(0, "Finished receiving idmapped mount file descriptors (%d | %d) from child", fd_from, fd_userns); |
1b82d721 CB |
4153 | |
4154 | attr.attr_set = MOUNT_ATTR_IDMAP; | |
4155 | attr.userns_fd = fd_userns; | |
4156 | ret = mount_setattr(fd_from, "", | |
4157 | AT_EMPTY_PATH | | |
3eb23230 | 4158 | (opts.bind_recursively ? AT_RECURSIVE : 0), |
1b82d721 CB |
4159 | &attr, sizeof(attr)); |
4160 | if (ret) | |
4161 | return syserror("Failed to idmap detached %smount %d to %d", | |
3eb23230 | 4162 | opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
4163 | fd_from, fd_userns); |
4164 | ||
5a782dca CB |
4165 | ret = lxc_abstract_unix_send_credential(handler->data_sock[1], |
4166 | &mnt_seq, | |
4167 | sizeof(mnt_seq)); | |
1b82d721 CB |
4168 | if (ret < 0) |
4169 | return syserror("Parent failed to notify child that detached %smount %d was idmapped to user namespace %d", | |
3eb23230 | 4170 | opts.bind_recursively ? "recursive " : "", |
1b82d721 CB |
4171 | fd_from, fd_userns); |
4172 | ||
4173 | TRACE("Parent idmapped detached %smount %d to user namespace %d", | |
3eb23230 | 4174 | opts.bind_recursively ? "recursive " : "", fd_from, fd_userns); |
5a782dca | 4175 | mnt_seq++; |
1b82d721 CB |
4176 | } |
4177 | } | |
4178 | ||
493ae3fe CB |
4179 | static int lxc_recv_ttys_from_child(struct lxc_handler *handler) |
4180 | { | |
b35f8f7e | 4181 | call_cleaner(lxc_delete_tty) struct lxc_tty_info *info_new = &(struct lxc_tty_info){}; |
493ae3fe CB |
4182 | int sock = handler->data_sock[1]; |
4183 | struct lxc_conf *conf = handler->conf; | |
b35f8f7e CB |
4184 | struct lxc_tty_info *tty_info = &conf->ttys; |
4185 | size_t ttys_max = tty_info->max; | |
4186 | struct lxc_terminal_info *terminal_info; | |
4187 | int ret; | |
493ae3fe | 4188 | |
b35f8f7e | 4189 | if (!ttys_max) |
493ae3fe CB |
4190 | return 0; |
4191 | ||
b35f8f7e CB |
4192 | info_new->tty = malloc(sizeof(*(info_new->tty)) * ttys_max); |
4193 | if (!info_new->tty) | |
4194 | return ret_errno(ENOMEM); | |
493ae3fe | 4195 | |
02d477cc | 4196 | for (size_t i = 0; i < ttys_max; i++) { |
b35f8f7e CB |
4197 | terminal_info = &info_new->tty[i]; |
4198 | terminal_info->busy = -1; | |
3b9f84fd | 4199 | terminal_info->pty_nr = -1; |
b35f8f7e CB |
4200 | terminal_info->ptx = -EBADF; |
4201 | terminal_info->pty = -EBADF; | |
4202 | } | |
493ae3fe | 4203 | |
02d477cc | 4204 | for (size_t i = 0; i < ttys_max; i++) { |
b35f8f7e CB |
4205 | int ptx = -EBADF, pty = -EBADF; |
4206 | ||
4207 | ret = lxc_abstract_unix_recv_two_fds(sock, &ptx, &pty); | |
493ae3fe | 4208 | if (ret < 0) |
b35f8f7e | 4209 | return syserror("Failed to receive %zu ttys from child", ttys_max); |
493ae3fe | 4210 | |
b35f8f7e CB |
4211 | terminal_info = &info_new->tty[i]; |
4212 | terminal_info->ptx = ptx; | |
4213 | terminal_info->pty = pty; | |
4214 | TRACE("Received pty with ptx fd %d and pty fd %d from child", | |
4215 | terminal_info->ptx, terminal_info->pty); | |
493ae3fe CB |
4216 | } |
4217 | ||
b35f8f7e CB |
4218 | tty_info->tty = move_ptr(info_new->tty); |
4219 | TRACE("Received %zu ttys from child", ttys_max); | |
4220 | return 0; | |
493ae3fe CB |
4221 | } |
4222 | ||
9f77617b CB |
4223 | static int lxc_send_console_to_parent(struct lxc_handler *handler) |
4224 | { | |
4225 | struct lxc_terminal *console = &handler->conf->console; | |
4226 | int ret; | |
4227 | ||
4228 | if (!wants_console(console)) | |
4229 | return 0; | |
4230 | ||
4231 | /* We've already allocated a console from the host's devpts instance. */ | |
4232 | if (console->pty < 0) | |
4233 | return 0; | |
4234 | ||
4235 | ret = __lxc_abstract_unix_send_two_fds(handler->data_sock[0], | |
4236 | console->ptx, console->pty, | |
4237 | console, | |
4238 | sizeof(struct lxc_terminal)); | |
4239 | if (ret < 0) | |
4240 | return syserror("Fail to send console to parent"); | |
4241 | ||
4242 | TRACE("Sent console to parent"); | |
4243 | return 0; | |
4244 | } | |
4245 | ||
4246 | static int lxc_recv_console_from_child(struct lxc_handler *handler) | |
4247 | { | |
4248 | __do_close int fd_ptx = -EBADF, fd_pty = -EBADF; | |
4249 | struct lxc_terminal *console = &handler->conf->console; | |
4250 | int ret; | |
4251 | ||
4252 | if (!wants_console(console)) | |
4253 | return 0; | |
4254 | ||
4255 | /* We've already allocated a console from the host's devpts instance. */ | |
4256 | if (console->pty >= 0) | |
4257 | return 0; | |
4258 | ||
4259 | ret = __lxc_abstract_unix_recv_two_fds(handler->data_sock[1], | |
4260 | &fd_ptx, &fd_pty, | |
4261 | console, | |
4262 | sizeof(struct lxc_terminal)); | |
4263 | if (ret < 0) | |
4264 | return syserror("Fail to receive console from child"); | |
4265 | ||
4266 | console->ptx = move_fd(fd_ptx); | |
4267 | console->pty = move_fd(fd_pty); | |
4268 | ||
4269 | TRACE("Received console from child"); | |
4270 | return 0; | |
4271 | } | |
4272 | ||
493ae3fe CB |
4273 | int lxc_sync_fds_parent(struct lxc_handler *handler) |
4274 | { | |
4275 | int ret; | |
4276 | ||
4277 | ret = lxc_seccomp_recv_notifier_fd(&handler->conf->seccomp, handler->data_sock[1]); | |
4278 | if (ret < 0) | |
4279 | return syserror_ret(ret, "Failed to receive seccomp notify fd from child"); | |
4280 | ||
42c0d056 | 4281 | ret = lxc_recv_devpts_from_child(handler); |
493ae3fe CB |
4282 | if (ret < 0) |
4283 | return syserror_ret(ret, "Failed to receive devpts fd from child"); | |
4284 | ||
4285 | /* Read tty fds allocated by child. */ | |
4286 | ret = lxc_recv_ttys_from_child(handler); | |
4287 | if (ret < 0) | |
4288 | return syserror_ret(ret, "Failed to receive tty info from child process"); | |
4289 | ||
4290 | if (handler->ns_clone_flags & CLONE_NEWNET) { | |
4291 | ret = lxc_network_recv_name_and_ifindex_from_child(handler); | |
4292 | if (ret < 0) | |
4293 | return syserror_ret(ret, "Failed to receive names and ifindices for network devices from child"); | |
4294 | } | |
4295 | ||
9f77617b CB |
4296 | ret = lxc_recv_console_from_child(handler); |
4297 | if (ret < 0) | |
4298 | return syserror_ret(ret, "Failed to receive console from child"); | |
4299 | ||
493ae3fe CB |
4300 | TRACE("Finished syncing file descriptors with child"); |
4301 | return 0; | |
4302 | } | |
4303 | ||
111ed96e CB |
4304 | int lxc_sync_fds_child(struct lxc_handler *handler) |
4305 | { | |
4306 | int ret; | |
4307 | ||
4308 | ret = lxc_seccomp_send_notifier_fd(&handler->conf->seccomp, handler->data_sock[0]); | |
4309 | if (ret < 0) | |
4310 | return syserror_ret(ret, "Failed to send seccomp notify fd to parent"); | |
4311 | ||
4312 | ret = lxc_send_devpts_to_parent(handler); | |
4313 | if (ret < 0) | |
4314 | return syserror_ret(ret, "Failed to send seccomp devpts fd to parent"); | |
4315 | ||
4316 | ret = lxc_send_ttys_to_parent(handler); | |
4317 | if (ret < 0) | |
4318 | return syserror_ret(ret, "Failed to send tty file descriptors to parent"); | |
4319 | ||
4320 | if (handler->ns_clone_flags & CLONE_NEWNET) { | |
4321 | ret = lxc_network_send_name_and_ifindex_to_parent(handler); | |
4322 | if (ret < 0) | |
4323 | return syserror_ret(ret, "Failed to send network device names and ifindices to parent"); | |
4324 | } | |
4325 | ||
9f77617b CB |
4326 | ret = lxc_send_console_to_parent(handler); |
4327 | if (ret < 0) | |
4328 | return syserror_ret(ret, "Failed to send console to parent"); | |
4329 | ||
111ed96e CB |
4330 | TRACE("Finished syncing file descriptors with parent"); |
4331 | return 0; | |
4332 | } | |
4333 | ||
7418b27f | 4334 | static int setup_capabilities(struct lxc_conf *conf) |
20ab7578 CB |
4335 | { |
4336 | int ret; | |
4337 | ||
4338 | if (conf->caps.keep) | |
cafcd2a7 | 4339 | ret = capabilities_allow(conf); |
20ab7578 | 4340 | else |
cafcd2a7 | 4341 | ret = capabilities_deny(conf); |
20ab7578 | 4342 | if (ret < 0) |
cafcd2a7 | 4343 | return syserror_ret(ret, "Failed to %s capabilities", conf->caps.keep ? "allow" : "deny"); |
20ab7578 CB |
4344 | |
4345 | return 0; | |
4346 | } | |
4347 | ||
7e739341 CB |
4348 | static int make_shmount_dependent_mount(const struct lxc_conf *conf) |
4349 | { | |
4350 | if (!(conf->auto_mounts & LXC_AUTO_SHMOUNTS_MASK)) | |
4351 | return 0; | |
4352 | ||
4353 | return mount(NULL, conf->shmount.path_cont, NULL, MS_REC | MS_SLAVE, 0); | |
4354 | } | |
4355 | ||
3b988b33 | 4356 | int lxc_setup(struct lxc_handler *handler) |
35120d9c | 4357 | { |
2187efd3 | 4358 | int ret; |
0fd73091 | 4359 | const char *lxcpath = handler->lxcpath, *name = handler->name; |
35120d9c | 4360 | struct lxc_conf *lxc_conf = handler->conf; |
35120d9c | 4361 | |
4b875ef9 CB |
4362 | ret = lxc_rootfs_prepare_child(handler); |
4363 | if (ret < 0) | |
4364 | return syserror("Failed to prepare rootfs"); | |
4365 | ||
8ce1abc2 | 4366 | ret = lxc_setup_rootfs_prepare_root(lxc_conf, name, lxcpath); |
55022530 CB |
4367 | if (ret < 0) |
4368 | return log_error(-1, "Failed to setup rootfs"); | |
35120d9c | 4369 | |
b87ee312 | 4370 | if (handler->nsfd[LXC_NS_UTS] == -EBADF) { |
8353b4c9 | 4371 | ret = setup_utsname(lxc_conf->utsname); |
55022530 CB |
4372 | if (ret < 0) |
4373 | return log_error(-1, "Failed to setup the utsname %s", name); | |
0ad19a3f | 4374 | } |
4375 | ||
8f818a84 | 4376 | if (!lxc_conf->keyring_disable_session) { |
d701d729 | 4377 | ret = lxc_setup_keyring(handler->lsm_ops, lxc_conf); |
8f818a84 | 4378 | if (ret < 0) |
d701d729 | 4379 | return log_error(-1, "Failed to setup container keyring"); |
8f818a84 | 4380 | } |
b25291da | 4381 | |
e389f2af | 4382 | if (handler->ns_clone_flags & CLONE_NEWNET) { |
6bc4165d CB |
4383 | ret = lxc_network_recv_from_parent(handler); |
4384 | if (ret < 0) | |
4385 | return log_error(-1, "Failed to receive veth names from parent"); | |
4386 | ||
87d0990c | 4387 | ret = lxc_setup_network_in_child_namespaces(lxc_conf); |
55022530 CB |
4388 | if (ret < 0) |
4389 | return log_error(-1, "Failed to setup network"); | |
790255cf CB |
4390 | } |
4391 | ||
bc6928ff | 4392 | if (lxc_conf->autodev > 0) { |
63012bdd | 4393 | ret = mount_autodev(name, &lxc_conf->rootfs, lxc_conf->autodevtmpfssize, lxcpath); |
55022530 CB |
4394 | if (ret < 0) |
4395 | return log_error(-1, "Failed to mount \"/dev\""); | |
c6883f38 SH |
4396 | } |
4397 | ||
8353b4c9 CB |
4398 | /* Do automatic mounts (mainly /proc and /sys), but exclude those that |
4399 | * need to wait until other stuff has finished. | |
368bbc02 | 4400 | */ |
6d25a524 | 4401 | ret = lxc_mount_auto_mounts(handler, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK); |
55022530 CB |
4402 | if (ret < 0) |
4403 | return log_error(-1, "Failed to setup first automatic mounts"); | |
368bbc02 | 4404 | |
48e5dcc8 | 4405 | ret = setup_mount_fstab(&lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath); |
55022530 CB |
4406 | if (ret < 0) |
4407 | return log_error(-1, "Failed to setup mounts"); | |
576f946d | 4408 | |
be0bc4d1 CB |
4409 | if (!list_empty(&lxc_conf->mount_entries)) { |
4410 | ret = setup_mount_entries(lxc_conf, &lxc_conf->rootfs, name, lxcpath); | |
55022530 CB |
4411 | if (ret < 0) |
4412 | return log_error(-1, "Failed to setup mount entries"); | |
c631115d FA |
4413 | } |
4414 | ||
1b82d721 CB |
4415 | if (!lxc_sync_wake_parent(handler, START_SYNC_IDMAPPED_MOUNTS)) |
4416 | return -1; | |
4417 | ||
4418 | ret = lxc_idmapped_mounts_child(handler); | |
4419 | if (ret) | |
4420 | return syserror("Failed to attached detached idmapped mounts"); | |
4421 | ||
1f0a3b6e CB |
4422 | lxc_conf->rootfs.dfd_dev = open_at(lxc_conf->rootfs.dfd_mnt, "dev", |
4423 | PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_BENEATH_XDEV, 0); | |
4424 | if (lxc_conf->rootfs.dfd_dev < 0 && errno != ENOENT) | |
4425 | return log_error_errno(-errno, errno, "Failed to open \"/dev\""); | |
4426 | ||
8353b4c9 CB |
4427 | /* Now mount only cgroups, if wanted. Before, /sys could not have been |
4428 | * mounted. It is guaranteed to be mounted now either through | |
4429 | * automatically or via fstab entries. | |
368bbc02 | 4430 | */ |
6d25a524 | 4431 | ret = lxc_mount_auto_mounts(handler, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK); |
55022530 CB |
4432 | if (ret < 0) |
4433 | return log_error(-1, "Failed to setup remaining automatic mounts"); | |
368bbc02 | 4434 | |
8353b4c9 | 4435 | ret = run_lxc_hooks(name, "mount", lxc_conf, NULL); |
55022530 CB |
4436 | if (ret < 0) |
4437 | return log_error(-1, "Failed to run mount hooks"); | |
773fb9ca | 4438 | |
4f2af104 CB |
4439 | if (lxc_rootfs_overmounted(&lxc_conf->rootfs)) |
4440 | return log_error(-1, "Rootfs overmounted"); | |
4441 | ||
bc6928ff | 4442 | if (lxc_conf->autodev > 0) { |
8353b4c9 | 4443 | ret = run_lxc_hooks(name, "autodev", lxc_conf, NULL); |
55022530 CB |
4444 | if (ret < 0) |
4445 | return log_error(-1, "Failed to run autodev hooks"); | |
06749971 | 4446 | |
8353b4c9 | 4447 | ret = lxc_fill_autodev(&lxc_conf->rootfs); |
55022530 CB |
4448 | if (ret < 0) |
4449 | return log_error(-1, "Failed to populate \"/dev\""); | |
91c3830e | 4450 | } |
368bbc02 | 4451 | |
75193660 | 4452 | /* Make sure any start hooks are in the container */ |
55022530 CB |
4453 | if (!verify_start_hooks(lxc_conf)) |
4454 | return log_error(-1, "Failed to verify start hooks"); | |
75193660 | 4455 | |
cf68ffd9 CB |
4456 | ret = lxc_create_tmp_proc_mount(lxc_conf); |
4457 | if (ret < 0) | |
3dd3fc31 | 4458 | return log_error(-1, "Failed to mount transient procfs instance for LSMs"); |
cf68ffd9 | 4459 | |
96a980e1 | 4460 | ret = lxc_setup_devpts_child(handler); |
289b707b CB |
4461 | if (ret < 0) |
4462 | return log_error(-1, "Failed to prepare new devpts instance"); | |
4463 | ||
03585adc CB |
4464 | ret = lxc_finish_devpts_child(handler); |
4465 | if (ret < 0) | |
4466 | return log_error(-1, "Failed to finish devpts setup"); | |
4467 | ||
f3dff080 | 4468 | ret = lxc_setup_console(handler, &lxc_conf->rootfs, &lxc_conf->console, |
37c74fd1 | 4469 | lxc_conf->ttys.dir); |
55022530 CB |
4470 | if (ret < 0) |
4471 | return log_error(-1, "Failed to setup console"); | |
6e590161 | 4472 | |
6a2ca1b4 CB |
4473 | ret = lxc_create_ttys(handler); |
4474 | if (ret < 0) | |
4475 | return log_error(-1, "Failed to create ttys"); | |
4476 | ||
ed8704d0 | 4477 | ret = lxc_setup_dev_symlinks(&lxc_conf->rootfs); |
55022530 CB |
4478 | if (ret < 0) |
4479 | return log_error(-1, "Failed to setup \"/dev\" symlinks"); | |
69aa6655 | 4480 | |
8ce1abc2 | 4481 | ret = lxc_setup_rootfs_switch_root(&lxc_conf->rootfs); |
55022530 CB |
4482 | if (ret < 0) |
4483 | return log_error(-1, "Failed to pivot root into rootfs"); | |
ed502555 | 4484 | |
7e739341 CB |
4485 | ret = make_shmount_dependent_mount(lxc_conf); |
4486 | if (ret < 0) | |
4487 | return log_error(-1, "Failed to turn mount tunnel \"%s\" into dependent mount", | |
4488 | lxc_conf->shmount.path_cont); | |
4489 | ||
20502652 CB |
4490 | /* Setting the boot-id is best-effort for now. */ |
4491 | if (lxc_conf->autodev > 0) | |
4492 | (void)lxc_setup_boot_id(); | |
4493 | ||
8353b4c9 | 4494 | ret = setup_personality(lxc_conf->personality); |
55022530 | 4495 | if (ret < 0) |
9c601e1f | 4496 | return syserror("Failed to set personality"); |
cccc74b5 | 4497 | |
8353b4c9 CB |
4498 | /* Set sysctl value to a path under /proc/sys as determined from the |
4499 | * key. For e.g. net.ipv4.ip_forward translated to | |
4500 | * /proc/sys/net/ipv4/ip_forward. | |
7edd0540 | 4501 | */ |
ba9f9347 CB |
4502 | ret = setup_sysctl_parameters(lxc_conf); |
4503 | if (ret < 0) | |
4504 | return log_error(-1, "Failed to setup sysctl parameters"); | |
7edd0540 | 4505 | |
7418b27f | 4506 | ret = setup_capabilities(lxc_conf); |
20ab7578 CB |
4507 | if (ret < 0) |
4508 | return log_error(-1, "Failed to setup capabilities"); | |
81810dd1 | 4509 | |
79ff643d | 4510 | put_lxc_rootfs(&handler->conf->rootfs, true); |
8353b4c9 | 4511 | NOTICE("The container \"%s\" is set up", name); |
cd54d859 | 4512 | |
0ad19a3f | 4513 | return 0; |
4514 | } | |
26ddeedd | 4515 | |
3f60c2f7 | 4516 | int run_lxc_hooks(const char *name, char *hookname, struct lxc_conf *conf, |
14a7b0f9 | 4517 | char *argv[]) |
26ddeedd | 4518 | { |
3ea957c6 | 4519 | int which; |
5090de3e | 4520 | struct string_entry *entry; |
3ea957c6 RK |
4521 | |
4522 | for (which = 0; which < NUM_LXC_HOOKS; which ++) { | |
71528742 | 4523 | if (strequal(hookname, lxchook_names[which])) |
3ea957c6 RK |
4524 | break; |
4525 | } | |
4526 | ||
4527 | if (which >= NUM_LXC_HOOKS) | |
26ddeedd | 4528 | return -1; |
3f60c2f7 | 4529 | |
5090de3e | 4530 | list_for_each_entry(entry, &conf->hooks[which], head) { |
26ddeedd | 4531 | int ret; |
5090de3e | 4532 | char *hook = entry->val; |
3f60c2f7 CB |
4533 | |
4534 | ret = run_script_argv(name, conf->hooks_version, "lxc", hook, | |
14a7b0f9 | 4535 | hookname, argv); |
3f60c2f7 CB |
4536 | if (ret < 0) |
4537 | return -1; | |
26ddeedd | 4538 | } |
3f60c2f7 | 4539 | |
26ddeedd SH |
4540 | return 0; |
4541 | } | |
72d0e1cb | 4542 | |
72d0e1cb SG |
4543 | int lxc_clear_config_caps(struct lxc_conf *c) |
4544 | { | |
20ab7578 | 4545 | struct cap_entry *cap, *ncap; |
72d0e1cb | 4546 | |
20ab7578 CB |
4547 | list_for_each_entry_safe(cap, ncap, &c->caps.list, head) { |
4548 | list_del(&cap->head); | |
4549 | free(cap->cap_name); | |
4550 | free(cap); | |
72d0e1cb | 4551 | } |
0fd73091 | 4552 | |
20ab7578 CB |
4553 | c->caps.keep = false; |
4554 | INIT_LIST_HEAD(&c->caps.list); | |
72d0e1cb SG |
4555 | return 0; |
4556 | } | |
4557 | ||
0589d744 | 4558 | static int lxc_free_idmap(struct list_head *id_map) |
c7e345ae | 4559 | { |
0589d744 | 4560 | struct id_map *map, *nmap; |
27c27d73 | 4561 | |
0589d744 CB |
4562 | list_for_each_entry_safe(map, nmap, id_map, head) { |
4563 | list_del(&map->head); | |
4564 | free(map); | |
27c27d73 | 4565 | } |
c7e345ae | 4566 | |
0589d744 | 4567 | INIT_LIST_HEAD(id_map); |
27c27d73 SH |
4568 | return 0; |
4569 | } | |
7e621263 | 4570 | |
0589d744 | 4571 | static int __lxc_free_idmap(struct list_head *id_map) |
7e621263 CB |
4572 | { |
4573 | lxc_free_idmap(id_map); | |
7e621263 CB |
4574 | return 0; |
4575 | } | |
0589d744 | 4576 | define_cleanup_function(struct list_head *, __lxc_free_idmap); |
27c27d73 | 4577 | |
4355ab5f SH |
4578 | int lxc_clear_idmaps(struct lxc_conf *c) |
4579 | { | |
4580 | return lxc_free_idmap(&c->id_map); | |
4581 | } | |
4582 | ||
a3ed9b81 | 4583 | int lxc_clear_namespace(struct lxc_conf *c) |
4584 | { | |
ced5587c CB |
4585 | for (int i = 0; i < LXC_NS_MAX; i++) |
4586 | free_disarm(c->ns_share[i]); | |
4587 | ||
a3ed9b81 | 4588 | return 0; |
4589 | } | |
4590 | ||
54860ed0 | 4591 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version) |
72d0e1cb | 4592 | { |
ab1a6cac | 4593 | const char *k = key; |
54860ed0 | 4594 | bool all = false; |
c9dbb8ed CB |
4595 | char *global_token, *namespaced_token; |
4596 | size_t namespaced_token_len; | |
4597 | struct list_head *list; | |
4598 | struct lxc_cgroup *cgroup, *ncgroup; | |
72d0e1cb | 4599 | |
54860ed0 | 4600 | if (version == CGROUP2_SUPER_MAGIC) { |
d6c06927 CB |
4601 | global_token = "lxc.cgroup2"; |
4602 | namespaced_token = "lxc.cgroup2."; | |
4603 | namespaced_token_len = STRLITERALLEN("lxc.cgroup2."); | |
54860ed0 CB |
4604 | list = &c->cgroup2; |
4605 | } else if (version == CGROUP_SUPER_MAGIC) { | |
d6c06927 CB |
4606 | global_token = "lxc.cgroup"; |
4607 | namespaced_token = "lxc.cgroup."; | |
4608 | namespaced_token_len = STRLITERALLEN("lxc.cgroup."); | |
54860ed0 CB |
4609 | list = &c->cgroup; |
4610 | } else { | |
d6c06927 | 4611 | return ret_errno(EINVAL); |
54860ed0 CB |
4612 | } |
4613 | ||
71528742 | 4614 | if (strequal(key, global_token)) |
72d0e1cb | 4615 | all = true; |
eed95eb0 | 4616 | else if (strnequal(key, namespaced_token, namespaced_token_len)) |
ab1a6cac | 4617 | k += namespaced_token_len; |
a6390f01 | 4618 | else |
d6c06927 | 4619 | return ret_errno(EINVAL); |
72d0e1cb | 4620 | |
c9dbb8ed CB |
4621 | list_for_each_entry_safe(cgroup, ncgroup, list, head) { |
4622 | if (!all && !strequal(cgroup->subsystem, k)) | |
72d0e1cb | 4623 | continue; |
54860ed0 | 4624 | |
c9dbb8ed CB |
4625 | list_del(&cgroup->head); |
4626 | free(cgroup->subsystem); | |
4627 | free(cgroup->value); | |
4628 | free(cgroup); | |
72d0e1cb | 4629 | } |
e409b214 | 4630 | |
cc36133d | 4631 | if (all) |
c9dbb8ed | 4632 | INIT_LIST_HEAD(list); |
cc36133d | 4633 | |
72d0e1cb SG |
4634 | return 0; |
4635 | } | |
4636 | ||
a7744f12 | 4637 | static inline void lxc_clear_cgroups_devices(struct lxc_conf *conf) |
4bfb655e | 4638 | { |
a7744f12 | 4639 | lxc_clear_cgroup2_devices(&conf->bpf_devices); |
4bfb655e CB |
4640 | } |
4641 | ||
c6d09e15 WB |
4642 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
4643 | { | |
c6d09e15 | 4644 | const char *k = NULL; |
0fd73091 | 4645 | bool all = false; |
223797c3 | 4646 | struct lxc_limit *lim, *nlim; |
c6d09e15 | 4647 | |
71528742 | 4648 | if (strequal(key, "lxc.limit") || strequal(key, "lxc.prlimit")) |
c6d09e15 | 4649 | all = true; |
eed95eb0 | 4650 | else if (strnequal(key, "lxc.limit.", STRLITERALLEN("lxc.limit."))) |
6333c915 | 4651 | k = key + STRLITERALLEN("lxc.limit."); |
eed95eb0 | 4652 | else if (strnequal(key, "lxc.prlimit.", STRLITERALLEN("lxc.prlimit."))) |
6333c915 | 4653 | k = key + STRLITERALLEN("lxc.prlimit."); |
c6d09e15 | 4654 | else |
786467cb | 4655 | return ret_errno(EINVAL); |
c6d09e15 | 4656 | |
223797c3 | 4657 | list_for_each_entry_safe(lim, nlim, &c->limits, head) { |
71528742 | 4658 | if (!all && !strequal(lim->resource, k)) |
c6d09e15 | 4659 | continue; |
0fd73091 | 4660 | |
223797c3 | 4661 | list_del(&lim->head); |
786467cb | 4662 | free_disarm(lim->resource); |
c6d09e15 | 4663 | free(lim); |
c6d09e15 | 4664 | } |
b668653c | 4665 | |
786467cb | 4666 | if (all) |
223797c3 | 4667 | INIT_LIST_HEAD(&c->limits); |
786467cb | 4668 | |
c6d09e15 WB |
4669 | return 0; |
4670 | } | |
4671 | ||
7edd0540 L |
4672 | int lxc_clear_sysctls(struct lxc_conf *c, const char *key) |
4673 | { | |
7edd0540 | 4674 | const char *k = NULL; |
0fd73091 | 4675 | bool all = false; |
ba9f9347 | 4676 | struct lxc_sysctl *sysctl, *nsysctl; |
7edd0540 | 4677 | |
71528742 | 4678 | if (strequal(key, "lxc.sysctl")) |
7edd0540 | 4679 | all = true; |
eed95eb0 | 4680 | else if (strnequal(key, "lxc.sysctl.", STRLITERALLEN("lxc.sysctl."))) |
6333c915 | 4681 | k = key + STRLITERALLEN("lxc.sysctl."); |
7edd0540 L |
4682 | else |
4683 | return -1; | |
4684 | ||
ba9f9347 CB |
4685 | list_for_each_entry_safe(sysctl, nsysctl, &c->sysctls, head) { |
4686 | if (!all && !strequal(sysctl->key, k)) | |
7edd0540 | 4687 | continue; |
0fd73091 | 4688 | |
ba9f9347 CB |
4689 | list_del(&sysctl->head); |
4690 | free(sysctl->key); | |
4691 | free(sysctl->value); | |
4692 | free(sysctl); | |
7edd0540 | 4693 | } |
0fd73091 | 4694 | |
4a2c9b40 | 4695 | if (all) |
ba9f9347 | 4696 | INIT_LIST_HEAD(&c->sysctls); |
4a2c9b40 | 4697 | |
7edd0540 L |
4698 | return 0; |
4699 | } | |
4700 | ||
61d7a733 YT |
4701 | int lxc_clear_procs(struct lxc_conf *c, const char *key) |
4702 | { | |
61d7a733 | 4703 | const char *k = NULL; |
0fd73091 | 4704 | bool all = false; |
91d04bf9 | 4705 | struct lxc_proc *proc, *nproc; |
61d7a733 | 4706 | |
71528742 | 4707 | if (strequal(key, "lxc.proc")) |
61d7a733 | 4708 | all = true; |
eed95eb0 | 4709 | else if (strnequal(key, "lxc.proc.", STRLITERALLEN("lxc.proc."))) |
6333c915 | 4710 | k = key + STRLITERALLEN("lxc.proc."); |
61d7a733 YT |
4711 | else |
4712 | return -1; | |
4713 | ||
91d04bf9 | 4714 | list_for_each_entry_safe(proc, nproc, &c->procs, head) { |
71528742 | 4715 | if (!all && !strequal(proc->filename, k)) |
61d7a733 | 4716 | continue; |
0fd73091 | 4717 | |
91d04bf9 | 4718 | list_del(&proc->head); |
61d7a733 YT |
4719 | free(proc->filename); |
4720 | free(proc->value); | |
4721 | free(proc); | |
61d7a733 YT |
4722 | } |
4723 | ||
cc36133d | 4724 | if (all) |
91d04bf9 | 4725 | INIT_LIST_HEAD(&c->procs); |
cc36133d | 4726 | |
61d7a733 YT |
4727 | return 0; |
4728 | } | |
4729 | ||
ee1e7aa0 SG |
4730 | int lxc_clear_groups(struct lxc_conf *c) |
4731 | { | |
ffb2a35f | 4732 | struct string_entry *entry, *nentry; |
ee1e7aa0 | 4733 | |
ffb2a35f CB |
4734 | list_for_each_entry_safe(entry, nentry, &c->groups, head) { |
4735 | list_del(&entry->head); | |
4736 | free(entry->val); | |
4737 | free(entry); | |
ee1e7aa0 | 4738 | } |
0fd73091 | 4739 | |
ffb2a35f | 4740 | INIT_LIST_HEAD(&c->groups); |
ee1e7aa0 SG |
4741 | return 0; |
4742 | } | |
4743 | ||
ab799c0b SG |
4744 | int lxc_clear_environment(struct lxc_conf *c) |
4745 | { | |
c294a68d | 4746 | struct environment_entry *env, *nenv; |
ab799c0b | 4747 | |
c294a68d CB |
4748 | list_for_each_entry_safe(env, nenv, &c->environment, head) { |
4749 | list_del(&env->head); | |
4750 | free(env->key); | |
4751 | free(env->val); | |
4752 | free(env); | |
ab799c0b | 4753 | } |
0fd73091 | 4754 | |
c294a68d | 4755 | INIT_LIST_HEAD(&c->environment); |
ab799c0b SG |
4756 | return 0; |
4757 | } | |
4758 | ||
72d0e1cb SG |
4759 | int lxc_clear_mount_entries(struct lxc_conf *c) |
4760 | { | |
be0bc4d1 | 4761 | struct string_entry *entry, *nentry; |
72d0e1cb | 4762 | |
be0bc4d1 CB |
4763 | list_for_each_entry_safe(entry, nentry, &c->mount_entries, head) { |
4764 | list_del(&entry->head); | |
4765 | free(entry->val); | |
4766 | free(entry); | |
72d0e1cb | 4767 | } |
0fd73091 | 4768 | |
be0bc4d1 | 4769 | INIT_LIST_HEAD(&c->mount_entries); |
72d0e1cb SG |
4770 | return 0; |
4771 | } | |
4772 | ||
b099e9e9 SH |
4773 | int lxc_clear_automounts(struct lxc_conf *c) |
4774 | { | |
4775 | c->auto_mounts = 0; | |
4776 | return 0; | |
4777 | } | |
4778 | ||
12a50cc6 | 4779 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 4780 | { |
0fd73091 CB |
4781 | const char *k = NULL; |
4782 | bool all = false, done = false; | |
5090de3e | 4783 | struct string_entry *entry, *nentry; |
72d0e1cb | 4784 | |
71528742 | 4785 | if (strequal(key, "lxc.hook")) |
17ed13a3 | 4786 | all = true; |
eed95eb0 | 4787 | else if (strnequal(key, "lxc.hook.", STRLITERALLEN("lxc.hook."))) |
6333c915 | 4788 | k = key + STRLITERALLEN("lxc.hook."); |
a6390f01 WB |
4789 | else |
4790 | return -1; | |
17ed13a3 | 4791 | |
ced5587c | 4792 | for (int i = 0; i < NUM_LXC_HOOKS; i++) { |
71528742 | 4793 | if (all || strequal(k, lxchook_names[i])) { |
5090de3e CB |
4794 | list_for_each_entry_safe(entry, nentry, &c->hooks[i], head) { |
4795 | list_del(&entry->head); | |
4796 | free(entry->val); | |
4797 | free(entry); | |
17ed13a3 | 4798 | } |
5090de3e | 4799 | INIT_LIST_HEAD(&c->hooks[i]); |
17ed13a3 | 4800 | done = true; |
72d0e1cb SG |
4801 | } |
4802 | } | |
17ed13a3 | 4803 | |
55022530 CB |
4804 | if (!done) |
4805 | return log_error(-1, "Invalid hook key: %s", key); | |
0fd73091 | 4806 | |
72d0e1cb SG |
4807 | return 0; |
4808 | } | |
8eb5694b | 4809 | |
1800f924 WB |
4810 | int lxc_clear_apparmor_raw(struct lxc_conf *c) |
4811 | { | |
1fb1e667 | 4812 | struct string_entry *entry, *nentry; |
1800f924 | 4813 | |
1fb1e667 CB |
4814 | list_for_each_entry_safe(entry, nentry, &c->lsm_aa_raw, head) { |
4815 | list_del(&entry->head); | |
4816 | free(entry->val); | |
4817 | free(entry); | |
1800f924 WB |
4818 | } |
4819 | ||
1fb1e667 | 4820 | INIT_LIST_HEAD(&c->lsm_aa_raw); |
1800f924 WB |
4821 | return 0; |
4822 | } | |
4823 | ||
8eb5694b SH |
4824 | void lxc_conf_free(struct lxc_conf *conf) |
4825 | { | |
4826 | if (!conf) | |
4827 | return; | |
0fd73091 | 4828 | |
858377e4 SH |
4829 | if (current_config == conf) |
4830 | current_config = NULL; | |
aed105d5 | 4831 | lxc_terminal_conf_free(&conf->console); |
f10fad2f | 4832 | free(conf->rootfs.mount); |
b3b8c97f | 4833 | free(conf->rootfs.bdev_type); |
f10fad2f | 4834 | free(conf->rootfs.path); |
79ff643d | 4835 | put_lxc_rootfs(&conf->rootfs, true); |
f10fad2f | 4836 | free(conf->logfile); |
858377e4 SH |
4837 | if (conf->logfd != -1) |
4838 | close(conf->logfd); | |
f10fad2f | 4839 | free(conf->utsname); |
885766f5 CB |
4840 | free(conf->ttys.dir); |
4841 | free(conf->ttys.tty_names); | |
f10fad2f ME |
4842 | free(conf->fstab); |
4843 | free(conf->rcfile); | |
5cda27c1 | 4844 | free(conf->execute_cmd); |
f10fad2f | 4845 | free(conf->init_cmd); |
bf31b337 | 4846 | free(conf->init_groups.list); |
3c491553 | 4847 | free(conf->init_cwd); |
6b0d5538 | 4848 | free(conf->unexpanded_config); |
76d0127f | 4849 | free(conf->syslog); |
87d0990c | 4850 | lxc_free_networks(conf); |
f10fad2f | 4851 | free(conf->lsm_aa_profile); |
1800f924 | 4852 | free(conf->lsm_aa_profile_computed); |
f10fad2f | 4853 | free(conf->lsm_se_context); |
1ed59e6d | 4854 | free(conf->lsm_se_keyring_context); |
c3e3c21a | 4855 | lxc_seccomp_free(&conf->seccomp); |
8eb5694b | 4856 | lxc_clear_config_caps(conf); |
54860ed0 CB |
4857 | lxc_clear_cgroups(conf, "lxc.cgroup", CGROUP_SUPER_MAGIC); |
4858 | lxc_clear_cgroups(conf, "lxc.cgroup2", CGROUP2_SUPER_MAGIC); | |
a7744f12 | 4859 | lxc_clear_cgroups_devices(conf); |
17ed13a3 | 4860 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 4861 | lxc_clear_mount_entries(conf); |
27c27d73 | 4862 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 4863 | lxc_clear_groups(conf); |
ab799c0b | 4864 | lxc_clear_environment(conf); |
240d4b74 | 4865 | lxc_clear_limits(conf, "lxc.prlimit"); |
7edd0540 | 4866 | lxc_clear_sysctls(conf, "lxc.sysctl"); |
61d7a733 | 4867 | lxc_clear_procs(conf, "lxc.proc"); |
1800f924 | 4868 | lxc_clear_apparmor_raw(conf); |
a3ed9b81 | 4869 | lxc_clear_namespace(conf); |
43654d34 | 4870 | free(conf->cgroup_meta.dir); |
a900cbaf | 4871 | free(conf->cgroup_meta.monitor_dir); |
eb60b564 | 4872 | free(conf->cgroup_meta.monitor_pivot_dir); |
a900cbaf WB |
4873 | free(conf->cgroup_meta.container_dir); |
4874 | free(conf->cgroup_meta.namespace_dir); | |
43654d34 | 4875 | free(conf->cgroup_meta.controllers); |
c55353f8 | 4876 | free(conf->cgroup_meta.systemd_scope); |
7a41e857 LT |
4877 | free(conf->shmount.path_host); |
4878 | free(conf->shmount.path_cont); | |
8eb5694b SH |
4879 | free(conf); |
4880 | } | |
4355ab5f SH |
4881 | |
4882 | struct userns_fn_data { | |
4883 | int (*fn)(void *); | |
c9b7c33e | 4884 | const char *fn_name; |
4355ab5f SH |
4885 | void *arg; |
4886 | int p[2]; | |
4887 | }; | |
4888 | ||
4889 | static int run_userns_fn(void *data) | |
4890 | { | |
766c5b6d | 4891 | struct userns_fn_data *d = data; |
adaffdd7 | 4892 | int ret; |
4355ab5f | 4893 | char c; |
4355ab5f | 4894 | |
766c5b6d | 4895 | close_prot_errno_disarm(d->p[1]); |
f8aa4bf3 | 4896 | |
766c5b6d CB |
4897 | /* |
4898 | * Wait for parent to finish establishing a new mapping in the user | |
f8aa4bf3 CB |
4899 | * namespace we are executing in. |
4900 | */ | |
adaffdd7 | 4901 | ret = lxc_read_nointr(d->p[0], &c, 1); |
766c5b6d | 4902 | close_prot_errno_disarm(d->p[0]); |
adaffdd7 CB |
4903 | if (ret != 1) |
4904 | return -1; | |
f8aa4bf3 | 4905 | |
c9b7c33e | 4906 | if (d->fn_name) |
adaffdd7 | 4907 | TRACE("Calling function \"%s\"", d->fn_name); |
0fd73091 | 4908 | |
f8aa4bf3 | 4909 | /* Call function to run. */ |
4355ab5f SH |
4910 | return d->fn(d->arg); |
4911 | } | |
4912 | ||
7581a82f | 4913 | static struct id_map *mapped_nsid_add(const struct lxc_conf *conf, unsigned id, |
db7cfe23 CB |
4914 | enum idtype idtype) |
4915 | { | |
5173b710 CB |
4916 | const struct id_map *map; |
4917 | struct id_map *retmap; | |
db7cfe23 CB |
4918 | |
4919 | map = find_mapped_nsid_entry(conf, id, idtype); | |
4920 | if (!map) | |
4921 | return NULL; | |
4922 | ||
b8e43ef0 | 4923 | retmap = zalloc(sizeof(*retmap)); |
db7cfe23 CB |
4924 | if (!retmap) |
4925 | return NULL; | |
4926 | ||
4927 | memcpy(retmap, map, sizeof(*retmap)); | |
4928 | return retmap; | |
4929 | } | |
4930 | ||
0589d744 | 4931 | static struct id_map *find_mapped_hostid_entry(const struct list_head *idmap, |
c4333195 | 4932 | unsigned id, enum idtype idtype) |
f8aa4bf3 | 4933 | { |
f8aa4bf3 | 4934 | struct id_map *retmap = NULL; |
0589d744 | 4935 | struct id_map *map; |
f8aa4bf3 | 4936 | |
0589d744 | 4937 | list_for_each_entry(map, idmap, head) { |
f8aa4bf3 CB |
4938 | if (map->idtype != idtype) |
4939 | continue; | |
4940 | ||
4941 | if (id >= map->hostid && id < map->hostid + map->range) { | |
4942 | retmap = map; | |
4943 | break; | |
4944 | } | |
4945 | } | |
4946 | ||
f8aa4bf3 CB |
4947 | return retmap; |
4948 | } | |
4949 | ||
0fd73091 | 4950 | /* Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
f8aa4bf3 | 4951 | * existing one or establish a new one. |
4355ab5f | 4952 | */ |
7581a82f | 4953 | static struct id_map *mapped_hostid_add(const struct lxc_conf *conf, uid_t id, |
0fd73091 | 4954 | enum idtype type) |
4355ab5f | 4955 | { |
55022530 | 4956 | __do_free struct id_map *entry = NULL; |
28a2d9e7 | 4957 | int hostid_mapped; |
55022530 | 4958 | struct id_map *tmp = NULL; |
c4333195 | 4959 | |
b8e43ef0 | 4960 | entry = zalloc(sizeof(*entry)); |
c4333195 CB |
4961 | if (!entry) |
4962 | return NULL; | |
f8aa4bf3 | 4963 | |
28a2d9e7 | 4964 | /* Reuse existing mapping. */ |
86c78011 | 4965 | tmp = find_mapped_hostid_entry(&conf->id_map, id, type); |
1758c195 CB |
4966 | if (tmp) { |
4967 | memcpy(entry, tmp, sizeof(*entry)); | |
4968 | } else { | |
4969 | /* Find new mapping. */ | |
4970 | hostid_mapped = find_unmapped_nsid(conf, type); | |
4971 | if (hostid_mapped < 0) | |
4972 | return log_debug(NULL, "Failed to find free mapping for id %d", id); | |
4973 | ||
4974 | entry->idtype = type; | |
4975 | entry->nsid = hostid_mapped; | |
4976 | entry->hostid = (unsigned long)id; | |
4977 | entry->range = 1; | |
4978 | } | |
4355ab5f | 4979 | |
55022530 | 4980 | return move_ptr(entry); |
4355ab5f SH |
4981 | } |
4982 | ||
0589d744 CB |
4983 | static int get_minimal_idmap(const struct lxc_conf *conf, uid_t *resuid, |
4984 | gid_t *resgid, struct list_head *head_ret) | |
4355ab5f | 4985 | { |
00d6cfe2 CB |
4986 | __do_free struct id_map *container_root_uid = NULL, |
4987 | *container_root_gid = NULL, | |
4988 | *host_uid_map = NULL, *host_gid_map = NULL; | |
f8aa4bf3 | 4989 | uid_t euid, egid; |
4160c3a0 CB |
4990 | uid_t nsuid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; |
4991 | gid_t nsgid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
4355ab5f | 4992 | |
db7cfe23 | 4993 | /* Find container root mappings. */ |
4160c3a0 | 4994 | container_root_uid = mapped_nsid_add(conf, nsuid, ID_TYPE_UID); |
55022530 | 4995 | if (!container_root_uid) |
0589d744 | 4996 | return sysdebug("Failed to find mapping for namespace uid %d", 0); |
dcf0ffdf CB |
4997 | euid = geteuid(); |
4998 | if (euid >= container_root_uid->hostid && | |
4999 | euid < (container_root_uid->hostid + container_root_uid->range)) | |
2c996219 | 5000 | host_uid_map = move_ptr(container_root_uid); |
f8aa4bf3 | 5001 | |
4160c3a0 | 5002 | container_root_gid = mapped_nsid_add(conf, nsgid, ID_TYPE_GID); |
55022530 | 5003 | if (!container_root_gid) |
0589d744 | 5004 | return sysdebug("Failed to find mapping for namespace gid %d", 0); |
dcf0ffdf CB |
5005 | egid = getegid(); |
5006 | if (egid >= container_root_gid->hostid && | |
5007 | egid < (container_root_gid->hostid + container_root_gid->range)) | |
2c996219 | 5008 | host_gid_map = move_ptr(container_root_gid); |
f8aa4bf3 CB |
5009 | |
5010 | /* Check whether the {g,u}id of the user has a mapping. */ | |
954b7d9b | 5011 | if (!host_uid_map) |
c4333195 | 5012 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
55022530 | 5013 | if (!host_uid_map) |
0589d744 | 5014 | return sysdebug("Failed to find mapping for uid %d", euid); |
f8aa4bf3 | 5015 | |
dcf0ffdf CB |
5016 | if (!host_gid_map) |
5017 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); | |
55022530 | 5018 | if (!host_gid_map) |
0589d744 | 5019 | return sysdebug("Failed to find mapping for gid %d", egid); |
28a2d9e7 | 5020 | |
47649d5b | 5021 | /* idmap will now keep track of that memory. */ |
0589d744 CB |
5022 | list_add_tail(&host_uid_map->head, head_ret); |
5023 | move_ptr(host_uid_map); | |
28a2d9e7 | 5024 | |
2c996219 | 5025 | if (container_root_uid) { |
47649d5b | 5026 | /* idmap will now keep track of that memory. */ |
0589d744 CB |
5027 | list_add_tail(&container_root_uid->head, head_ret); |
5028 | move_ptr(container_root_uid); | |
28a2d9e7 | 5029 | } |
f8aa4bf3 | 5030 | |
47649d5b | 5031 | /* idmap will now keep track of that memory. */ |
0589d744 CB |
5032 | list_add_tail(&host_gid_map->head, head_ret); |
5033 | move_ptr(host_gid_map); | |
28a2d9e7 | 5034 | |
2c996219 | 5035 | if (container_root_gid) { |
47649d5b | 5036 | /* idmap will now keep track of that memory. */ |
0589d744 CB |
5037 | list_add_tail(&container_root_gid->head, head_ret); |
5038 | move_ptr(container_root_gid); | |
28a2d9e7 | 5039 | } |
f8aa4bf3 | 5040 | |
dbfcdf86 CB |
5041 | TRACE("Allocated minimal idmapping for ns uid %d and ns gid %d", nsuid, nsgid); |
5042 | ||
5043 | if (resuid) | |
5044 | *resuid = nsuid; | |
5045 | if (resgid) | |
5046 | *resgid = nsgid; | |
0589d744 CB |
5047 | |
5048 | return 0; | |
dcf0ffdf CB |
5049 | } |
5050 | ||
766c5b6d CB |
5051 | /* |
5052 | * Run a function in a new user namespace. | |
dcf0ffdf CB |
5053 | * The caller's euid/egid will be mapped if it is not already. |
5054 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
5055 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
5056 | * This means we require only to establish a mapping from: | |
5057 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
5058 | * - the container root -> some sub{g,u}id | |
915e3dbd | 5059 | * The former we add, if the user did not specify a mapping. The latter we |
6f3fd27f | 5060 | * retrieve from the container's configured {g,u}id mappings as it must have been |
dcf0ffdf CB |
5061 | * there to start the container in the first place. |
5062 | */ | |
7581a82f | 5063 | int userns_exec_1(const struct lxc_conf *conf, int (*fn)(void *), void *data, |
dcf0ffdf CB |
5064 | const char *fn_name) |
5065 | { | |
0589d744 CB |
5066 | LIST_HEAD(minimal_idmap); |
5067 | call_cleaner(__lxc_free_idmap) struct list_head *idmap = &minimal_idmap; | |
0fd73091 CB |
5068 | int ret = -1, status = -1; |
5069 | char c = '1'; | |
46bc6f2a CB |
5070 | struct userns_fn_data d = { |
5071 | .arg = data, | |
5072 | .fn = fn, | |
5073 | .fn_name = fn_name, | |
5074 | }; | |
766c5b6d CB |
5075 | pid_t pid; |
5076 | int pipe_fds[2]; | |
dcf0ffdf | 5077 | |
2b2655a8 CB |
5078 | if (!conf) |
5079 | return -EINVAL; | |
5080 | ||
0589d744 CB |
5081 | ret = get_minimal_idmap(conf, NULL, NULL, idmap); |
5082 | if (ret) | |
766c5b6d | 5083 | return ret_errno(ENOENT); |
dcf0ffdf | 5084 | |
766c5b6d CB |
5085 | ret = pipe2(pipe_fds, O_CLOEXEC); |
5086 | if (ret < 0) | |
5087 | return -errno; | |
5088 | ||
766c5b6d CB |
5089 | d.p[0] = pipe_fds[0]; |
5090 | d.p[1] = pipe_fds[1]; | |
dcf0ffdf CB |
5091 | |
5092 | /* Clone child in new user namespace. */ | |
a59440be | 5093 | pid = lxc_raw_clone_cb(run_userns_fn, &d, CLONE_NEWUSER, NULL); |
dcf0ffdf | 5094 | if (pid < 0) { |
0fd73091 | 5095 | ERROR("Failed to clone process in new user namespace"); |
dcf0ffdf CB |
5096 | goto on_error; |
5097 | } | |
5098 | ||
766c5b6d | 5099 | close_prot_errno_disarm(pipe_fds[0]); |
dcf0ffdf | 5100 | |
62fef886 | 5101 | if (lxc_log_trace()) { |
dcf0ffdf CB |
5102 | struct id_map *map; |
5103 | ||
0589d744 | 5104 | list_for_each_entry(map, idmap, head) |
766c5b6d CB |
5105 | TRACE("Establishing %cid mapping for \"%d\" in new user namespace: nsuid %lu - hostid %lu - range %lu", |
5106 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, map->nsid, map->hostid, map->range); | |
4355ab5f SH |
5107 | } |
5108 | ||
f8aa4bf3 | 5109 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 5110 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 | 5111 | if (ret < 0) { |
0fd73091 | 5112 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); |
f8aa4bf3 | 5113 | goto on_error; |
4355ab5f SH |
5114 | } |
5115 | ||
f8aa4bf3 | 5116 | /* Tell child to proceed. */ |
766c5b6d | 5117 | if (lxc_write_nointr(pipe_fds[1], &c, 1) != 1) { |
dcf0ffdf | 5118 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
f8aa4bf3 | 5119 | goto on_error; |
4355ab5f SH |
5120 | } |
5121 | ||
686dd5d1 | 5122 | on_error: |
766c5b6d CB |
5123 | close_prot_errno_disarm(pipe_fds[0]); |
5124 | close_prot_errno_disarm(pipe_fds[1]); | |
f8aa4bf3 | 5125 | |
ee1b16bc TA |
5126 | /* Wait for child to finish. */ |
5127 | if (pid > 0) | |
5128 | status = wait_for_pid(pid); | |
5129 | ||
686dd5d1 CB |
5130 | if (status < 0) |
5131 | ret = -1; | |
5132 | ||
f8aa4bf3 | 5133 | return ret; |
4355ab5f | 5134 | } |
97e9cfa0 | 5135 | |
d1783ef4 CB |
5136 | int userns_exec_minimal(const struct lxc_conf *conf, |
5137 | int (*fn_parent)(void *), void *fn_parent_data, | |
5138 | int (*fn_child)(void *), void *fn_child_data) | |
edf88289 | 5139 | { |
0589d744 CB |
5140 | LIST_HEAD(minimal_idmap); |
5141 | call_cleaner(__lxc_free_idmap) struct list_head *idmap = &minimal_idmap; | |
dbfcdf86 CB |
5142 | uid_t resuid = LXC_INVALID_UID; |
5143 | gid_t resgid = LXC_INVALID_GID; | |
edf88289 | 5144 | char c = '1'; |
dbfcdf86 | 5145 | ssize_t ret; |
edf88289 CB |
5146 | pid_t pid; |
5147 | int sock_fds[2]; | |
5148 | ||
d1783ef4 | 5149 | if (!conf || !fn_child) |
dbfcdf86 | 5150 | return ret_errno(EINVAL); |
edf88289 | 5151 | |
0589d744 CB |
5152 | ret = get_minimal_idmap(conf, &resuid, &resgid, idmap); |
5153 | if (ret) | |
edf88289 CB |
5154 | return ret_errno(ENOENT); |
5155 | ||
5156 | ret = socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, sock_fds); | |
5157 | if (ret < 0) | |
5158 | return -errno; | |
5159 | ||
5160 | pid = fork(); | |
5161 | if (pid < 0) { | |
dbfcdf86 | 5162 | SYSERROR("Failed to create new process"); |
edf88289 CB |
5163 | goto on_error; |
5164 | } | |
5165 | ||
5166 | if (pid == 0) { | |
5167 | close_prot_errno_disarm(sock_fds[1]); | |
5168 | ||
5169 | ret = unshare(CLONE_NEWUSER); | |
dbfcdf86 CB |
5170 | if (ret < 0) { |
5171 | SYSERROR("Failed to unshare new user namespace"); | |
edf88289 | 5172 | _exit(EXIT_FAILURE); |
dbfcdf86 | 5173 | } |
edf88289 | 5174 | |
dbfcdf86 CB |
5175 | ret = lxc_write_nointr(sock_fds[0], &c, 1); |
5176 | if (ret != 1) | |
edf88289 CB |
5177 | _exit(EXIT_FAILURE); |
5178 | ||
5179 | ret = lxc_read_nointr(sock_fds[0], &c, 1); | |
5180 | if (ret != 1) | |
5181 | _exit(EXIT_FAILURE); | |
5182 | ||
5183 | close_prot_errno_disarm(sock_fds[0]); | |
5184 | ||
8917c382 | 5185 | if (!lxc_drop_groups() && errno != EPERM) |
edf88289 CB |
5186 | _exit(EXIT_FAILURE); |
5187 | ||
dbfcdf86 CB |
5188 | ret = setresgid(resgid, resgid, resgid); |
5189 | if (ret < 0) { | |
5190 | SYSERROR("Failed to setresgid(%d, %d, %d)", | |
5191 | resgid, resgid, resgid); | |
edf88289 | 5192 | _exit(EXIT_FAILURE); |
dbfcdf86 CB |
5193 | } |
5194 | ||
5195 | ret = setresuid(resuid, resuid, resuid); | |
5196 | if (ret < 0) { | |
5197 | SYSERROR("Failed to setresuid(%d, %d, %d)", | |
5198 | resuid, resuid, resuid); | |
5199 | _exit(EXIT_FAILURE); | |
5200 | } | |
edf88289 | 5201 | |
d1783ef4 | 5202 | ret = fn_child(fn_child_data); |
dbfcdf86 CB |
5203 | if (ret) { |
5204 | SYSERROR("Running function in new user namespace failed"); | |
edf88289 | 5205 | _exit(EXIT_FAILURE); |
dbfcdf86 | 5206 | } |
edf88289 CB |
5207 | |
5208 | _exit(EXIT_SUCCESS); | |
5209 | } | |
5210 | ||
5211 | close_prot_errno_disarm(sock_fds[0]); | |
5212 | ||
62fef886 | 5213 | if (lxc_log_trace()) { |
edf88289 | 5214 | struct id_map *map; |
edf88289 | 5215 | |
0589d744 | 5216 | list_for_each_entry(map, idmap, head) |
edf88289 CB |
5217 | TRACE("Establishing %cid mapping for \"%d\" in new user namespace: nsuid %lu - hostid %lu - range %lu", |
5218 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, map->nsid, map->hostid, map->range); | |
edf88289 CB |
5219 | } |
5220 | ||
5221 | ret = lxc_read_nointr(sock_fds[1], &c, 1); | |
5222 | if (ret != 1) { | |
5223 | SYSERROR("Failed waiting for child process %d\" to tell us to proceed", pid); | |
5224 | goto on_error; | |
5225 | } | |
5226 | ||
5227 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
5228 | ret = lxc_map_ids(idmap, pid); | |
5229 | if (ret < 0) { | |
5230 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); | |
5231 | goto on_error; | |
5232 | } | |
5233 | ||
5234 | /* Tell child to proceed. */ | |
5235 | ret = lxc_write_nointr(sock_fds[1], &c, 1); | |
5236 | if (ret != 1) { | |
5237 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); | |
5238 | goto on_error; | |
5239 | } | |
5240 | ||
d1783ef4 CB |
5241 | if (fn_parent && fn_parent(fn_parent_data)) { |
5242 | SYSERROR("Running parent function failed"); | |
5243 | _exit(EXIT_FAILURE); | |
5244 | } | |
5245 | ||
edf88289 CB |
5246 | on_error: |
5247 | close_prot_errno_disarm(sock_fds[0]); | |
5248 | close_prot_errno_disarm(sock_fds[1]); | |
5249 | ||
5250 | /* Wait for child to finish. */ | |
dbfcdf86 CB |
5251 | if (pid < 0) |
5252 | return -1; | |
edf88289 | 5253 | |
dbfcdf86 | 5254 | return wait_for_pid(pid); |
edf88289 CB |
5255 | } |
5256 | ||
415a8851 CB |
5257 | int userns_exec_full(struct lxc_conf *conf, int (*fn)(void *), void *data, |
5258 | const char *fn_name) | |
5259 | { | |
0589d744 CB |
5260 | LIST_HEAD(full_idmap); |
5261 | int ret = -1; | |
5262 | char c = '1'; | |
5263 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, | |
5264 | *host_uid_map = NULL, *host_gid_map = NULL; | |
415a8851 CB |
5265 | pid_t pid; |
5266 | uid_t euid, egid; | |
415a8851 CB |
5267 | int p[2]; |
5268 | struct id_map *map; | |
0fd73091 | 5269 | struct userns_fn_data d; |
415a8851 | 5270 | |
2b2655a8 CB |
5271 | if (!conf) |
5272 | return -EINVAL; | |
5273 | ||
979f9e34 | 5274 | ret = pipe2(p, O_CLOEXEC); |
0589d744 CB |
5275 | if (ret < 0) |
5276 | return -errno; | |
5277 | ||
415a8851 CB |
5278 | d.fn = fn; |
5279 | d.fn_name = fn_name; | |
5280 | d.arg = data; | |
5281 | d.p[0] = p[0]; | |
5282 | d.p[1] = p[1]; | |
5283 | ||
5284 | /* Clone child in new user namespace. */ | |
33258b95 | 5285 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER, NULL); |
415a8851 | 5286 | if (pid < 0) { |
0fd73091 | 5287 | ERROR("Failed to clone process in new user namespace"); |
415a8851 CB |
5288 | goto on_error; |
5289 | } | |
5290 | ||
5291 | close(p[0]); | |
5292 | p[0] = -1; | |
5293 | ||
5294 | euid = geteuid(); | |
5295 | egid = getegid(); | |
5296 | ||
415a8851 | 5297 | /* Find container root. */ |
0589d744 CB |
5298 | list_for_each_entry(map, &conf->id_map, head) { |
5299 | __do_free struct id_map *dup_map = NULL; | |
415a8851 | 5300 | |
0589d744 CB |
5301 | dup_map = memdup(map, sizeof(struct id_map)); |
5302 | if (!dup_map) | |
415a8851 CB |
5303 | goto on_error; |
5304 | ||
0589d744 CB |
5305 | list_add_tail(&dup_map->head, &full_idmap); |
5306 | move_ptr(dup_map); | |
415a8851 CB |
5307 | |
5308 | if (map->idtype == ID_TYPE_UID) | |
5309 | if (euid >= map->hostid && euid < map->hostid + map->range) | |
5310 | host_uid_map = map; | |
5311 | ||
5312 | if (map->idtype == ID_TYPE_GID) | |
5313 | if (egid >= map->hostid && egid < map->hostid + map->range) | |
5314 | host_gid_map = map; | |
5315 | ||
5316 | if (map->nsid != 0) | |
5317 | continue; | |
5318 | ||
5319 | if (map->idtype == ID_TYPE_UID) | |
5320 | if (container_root_uid == NULL) | |
5321 | container_root_uid = map; | |
5322 | ||
5323 | if (map->idtype == ID_TYPE_GID) | |
5324 | if (container_root_gid == NULL) | |
5325 | container_root_gid = map; | |
5326 | } | |
5327 | ||
5328 | if (!container_root_uid || !container_root_gid) { | |
5329 | ERROR("No mapping for container root found"); | |
5330 | goto on_error; | |
5331 | } | |
5332 | ||
5333 | /* Check whether the {g,u}id of the user has a mapping. */ | |
5334 | if (!host_uid_map) | |
c4333195 | 5335 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
415a8851 CB |
5336 | else |
5337 | host_uid_map = container_root_uid; | |
5338 | ||
5339 | if (!host_gid_map) | |
c4333195 | 5340 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); |
415a8851 CB |
5341 | else |
5342 | host_gid_map = container_root_gid; | |
5343 | ||
5344 | if (!host_uid_map) { | |
5345 | DEBUG("Failed to find mapping for uid %d", euid); | |
5346 | goto on_error; | |
5347 | } | |
5348 | ||
5349 | if (!host_gid_map) { | |
5350 | DEBUG("Failed to find mapping for gid %d", egid); | |
5351 | goto on_error; | |
5352 | } | |
5353 | ||
5354 | if (host_uid_map && (host_uid_map != container_root_uid)) { | |
0589d744 CB |
5355 | /* idmap will now keep track of that memory. */ |
5356 | list_add_tail(&host_uid_map->head, &full_idmap); | |
5357 | move_ptr(host_uid_map); | |
415a8851 | 5358 | } |
415a8851 CB |
5359 | |
5360 | if (host_gid_map && (host_gid_map != container_root_gid)) { | |
0589d744 CB |
5361 | /* idmap will now keep track of that memory. */ |
5362 | list_add_tail(&host_gid_map->head, &full_idmap); | |
5363 | move_ptr(host_gid_map); | |
415a8851 | 5364 | } |
415a8851 | 5365 | |
62fef886 | 5366 | if (lxc_log_trace()) { |
0589d744 CB |
5367 | list_for_each_entry(map, &full_idmap, head) { |
5368 | TRACE("establishing %cid mapping for \"%d\" in new user namespace: nsuid %lu - hostid %lu - range %lu", | |
415a8851 CB |
5369 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, |
5370 | map->nsid, map->hostid, map->range); | |
5371 | } | |
5372 | } | |
5373 | ||
5374 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
0589d744 | 5375 | ret = lxc_map_ids(&full_idmap, pid); |
415a8851 | 5376 | if (ret < 0) { |
0fd73091 | 5377 | ERROR("error setting up {g,u}id mappings for child process \"%d\"", pid); |
415a8851 CB |
5378 | goto on_error; |
5379 | } | |
5380 | ||
5381 | /* Tell child to proceed. */ | |
489f39be | 5382 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
0fd73091 | 5383 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
415a8851 CB |
5384 | goto on_error; |
5385 | } | |
5386 | ||
686dd5d1 | 5387 | on_error: |
ee1b16bc TA |
5388 | if (p[0] != -1) |
5389 | close(p[0]); | |
5390 | close(p[1]); | |
5391 | ||
415a8851 | 5392 | /* Wait for child to finish. */ |
686dd5d1 CB |
5393 | if (pid > 0) |
5394 | ret = wait_for_pid(pid); | |
415a8851 | 5395 | |
0589d744 | 5396 | __lxc_free_idmap(&full_idmap); |
80758b4b | 5397 | |
415a8851 CB |
5398 | if (host_uid_map && (host_uid_map != container_root_uid)) |
5399 | free(host_uid_map); | |
5400 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
5401 | free(host_gid_map); | |
5402 | ||
415a8851 CB |
5403 | return ret; |
5404 | } | |
5405 | ||
0589d744 | 5406 | static int add_idmap_entry(struct list_head *idmap_list, enum idtype idtype, |
234998b4 CB |
5407 | unsigned long nsid, unsigned long hostid, |
5408 | unsigned long range) | |
5409 | { | |
5410 | __do_free struct id_map *new_idmap = NULL; | |
234998b4 CB |
5411 | |
5412 | new_idmap = zalloc(sizeof(*new_idmap)); | |
5413 | if (!new_idmap) | |
5414 | return ret_errno(ENOMEM); | |
5415 | ||
5416 | new_idmap->idtype = idtype; | |
5417 | new_idmap->hostid = hostid; | |
5418 | new_idmap->nsid = nsid; | |
5419 | new_idmap->range = range; | |
5420 | ||
0589d744 CB |
5421 | list_add_tail(&new_idmap->head, idmap_list); |
5422 | move_ptr(new_idmap); | |
234998b4 CB |
5423 | |
5424 | INFO("Adding id map: type %c nsid %lu hostid %lu range %lu", | |
5425 | idtype == ID_TYPE_UID ? 'u' : 'g', nsid, hostid, range); | |
5426 | return 0; | |
5427 | } | |
5428 | ||
5429 | int userns_exec_mapped_root(const char *path, int path_fd, | |
5430 | const struct lxc_conf *conf) | |
5431 | { | |
0589d744 CB |
5432 | LIST_HEAD(idmap_list); |
5433 | call_cleaner(__lxc_free_idmap) struct list_head *idmap = &idmap_list; | |
234998b4 CB |
5434 | __do_close int fd = -EBADF; |
5435 | int target_fd = -EBADF; | |
5436 | char c = '1'; | |
5437 | ssize_t ret; | |
5438 | pid_t pid; | |
5439 | int sock_fds[2]; | |
5440 | uid_t container_host_uid, hostuid; | |
5441 | gid_t container_host_gid, hostgid; | |
5442 | struct stat st; | |
5443 | ||
5444 | if (!conf || (!path && path_fd < 0)) | |
5445 | return ret_errno(EINVAL); | |
5446 | ||
5447 | if (!path) | |
5448 | path = "(null)"; | |
5449 | ||
5450 | container_host_uid = get_mapped_rootid(conf, ID_TYPE_UID); | |
5451 | if (!uid_valid(container_host_uid)) | |
5452 | return log_error(-1, "No uid mapping for container root"); | |
5453 | ||
5454 | container_host_gid = get_mapped_rootid(conf, ID_TYPE_GID); | |
5455 | if (!gid_valid(container_host_gid)) | |
5456 | return log_error(-1, "No gid mapping for container root"); | |
5457 | ||
cf68ffd9 | 5458 | if (path_fd < 0) { |
a72c68f7 | 5459 | fd = open(path, O_CLOEXEC | O_NOCTTY); |
234998b4 CB |
5460 | if (fd < 0) |
5461 | return log_error_errno(-errno, errno, "Failed to open \"%s\"", path); | |
5462 | target_fd = fd; | |
5463 | } else { | |
5464 | target_fd = path_fd; | |
5465 | } | |
5466 | ||
5467 | hostuid = geteuid(); | |
5468 | /* We are root so chown directly. */ | |
5469 | if (hostuid == 0) { | |
5470 | ret = fchown(target_fd, container_host_uid, container_host_gid); | |
5471 | if (ret) | |
5472 | return log_error_errno(-errno, errno, | |
5473 | "Failed to fchown(%d(%s), %d, %d)", | |
5474 | target_fd, path, container_host_uid, | |
5475 | container_host_gid); | |
5476 | return log_trace(0, "Chowned %d(%s) to uid %d and %d", target_fd, path, | |
5477 | container_host_uid, container_host_gid); | |
5478 | } | |
5479 | ||
5480 | /* The container's root host id matches */ | |
5481 | if (container_host_uid == hostuid) | |
5482 | return log_info(0, "Container root id is mapped to our uid"); | |
5483 | ||
5484 | /* Get the current ids of our target. */ | |
5485 | ret = fstat(target_fd, &st); | |
5486 | if (ret) | |
5487 | return log_error_errno(-errno, errno, "Failed to stat \"%s\"", path); | |
5488 | ||
5489 | hostgid = getegid(); | |
5490 | if (st.st_uid == hostuid && mapped_hostid(st.st_gid, conf, ID_TYPE_GID) < 0) { | |
5491 | ret = fchown(target_fd, -1, hostgid); | |
5492 | if (ret) | |
5493 | return log_error_errno(-errno, errno, | |
5494 | "Failed to fchown(%d(%s), -1, %d)", | |
5495 | target_fd, path, hostgid); | |
2e8013f9 | 5496 | TRACE("Chowned %d(%s) to -1:%d", target_fd, path, hostgid); |
234998b4 CB |
5497 | } |
5498 | ||
234998b4 CB |
5499 | /* "u:0:rootuid:1" */ |
5500 | ret = add_idmap_entry(idmap, ID_TYPE_UID, 0, container_host_uid, 1); | |
5501 | if (ret < 0) | |
5502 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
5503 | ||
5504 | /* "u:hostuid:hostuid:1" */ | |
5505 | ret = add_idmap_entry(idmap, ID_TYPE_UID, hostuid, hostuid, 1); | |
5506 | if (ret < 0) | |
5507 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
5508 | ||
5509 | /* "g:0:rootgid:1" */ | |
5510 | ret = add_idmap_entry(idmap, ID_TYPE_GID, 0, container_host_gid, 1); | |
5511 | if (ret < 0) | |
5512 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
5513 | ||
5514 | /* "g:hostgid:hostgid:1" */ | |
5515 | ret = add_idmap_entry(idmap, ID_TYPE_GID, hostgid, hostgid, 1); | |
5516 | if (ret < 0) | |
5517 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
5518 | ||
5519 | if (hostgid != st.st_gid) { | |
5520 | /* "g:pathgid:rootgid+pathgid:1" */ | |
5521 | ret = add_idmap_entry(idmap, ID_TYPE_GID, st.st_gid, | |
5522 | container_host_gid + (gid_t)st.st_gid, 1); | |
5523 | if (ret < 0) | |
5524 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
5525 | } | |
5526 | ||
5527 | ret = socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, sock_fds); | |
5528 | if (ret < 0) | |
5529 | return -errno; | |
5530 | ||
5531 | pid = fork(); | |
5532 | if (pid < 0) { | |
5533 | SYSERROR("Failed to create new process"); | |
5534 | goto on_error; | |
5535 | } | |
5536 | ||
5537 | if (pid == 0) { | |
5538 | close_prot_errno_disarm(sock_fds[1]); | |
5539 | ||
5540 | ret = unshare(CLONE_NEWUSER); | |
5541 | if (ret < 0) { | |
5542 | SYSERROR("Failed to unshare new user namespace"); | |
5543 | _exit(EXIT_FAILURE); | |
5544 | } | |
5545 | ||
5546 | ret = lxc_write_nointr(sock_fds[0], &c, 1); | |
5547 | if (ret != 1) | |
5548 | _exit(EXIT_FAILURE); | |
5549 | ||
5550 | ret = lxc_read_nointr(sock_fds[0], &c, 1); | |
5551 | if (ret != 1) | |
5552 | _exit(EXIT_FAILURE); | |
5553 | ||
5554 | close_prot_errno_disarm(sock_fds[0]); | |
5555 | ||
e0f6f149 | 5556 | if (!lxc_drop_groups() && errno != EPERM) |
234998b4 CB |
5557 | _exit(EXIT_FAILURE); |
5558 | ||
e0f6f149 CB |
5559 | ret = setresgid(0, 0, 0); |
5560 | if (ret < 0) { | |
5561 | SYSERROR("Failed to setresgid(0, 0, 0)"); | |
234998b4 | 5562 | _exit(EXIT_FAILURE); |
e0f6f149 CB |
5563 | } |
5564 | ||
5565 | ret = setresuid(0, 0, 0); | |
5566 | if (ret < 0) { | |
5567 | SYSERROR("Failed to setresuid(0, 0, 0)"); | |
5568 | _exit(EXIT_FAILURE); | |
5569 | } | |
234998b4 | 5570 | |
8053a085 | 5571 | ret = fchown(target_fd, 0, st.st_gid); |
234998b4 | 5572 | if (ret) { |
8ea93a0f | 5573 | SYSERROR("Failed to chown %d(%s) to 0:%d", target_fd, path, st.st_gid); |
234998b4 CB |
5574 | _exit(EXIT_FAILURE); |
5575 | } | |
5576 | ||
2e8013f9 | 5577 | TRACE("Chowned %d(%s) to 0:%d", target_fd, path, st.st_gid); |
234998b4 CB |
5578 | _exit(EXIT_SUCCESS); |
5579 | } | |
5580 | ||
5581 | close_prot_errno_disarm(sock_fds[0]); | |
5582 | ||
62fef886 | 5583 | if (lxc_log_trace()) { |
234998b4 | 5584 | struct id_map *map; |
234998b4 | 5585 | |
0589d744 | 5586 | list_for_each_entry(map, idmap, head) |
234998b4 CB |
5587 | TRACE("Establishing %cid mapping for \"%d\" in new user namespace: nsuid %lu - hostid %lu - range %lu", |
5588 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, map->nsid, map->hostid, map->range); | |
234998b4 CB |
5589 | } |
5590 | ||
5591 | ret = lxc_read_nointr(sock_fds[1], &c, 1); | |
5592 | if (ret != 1) { | |
5593 | SYSERROR("Failed waiting for child process %d\" to tell us to proceed", pid); | |
5594 | goto on_error; | |
5595 | } | |
5596 | ||
5597 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
5598 | ret = lxc_map_ids(idmap, pid); | |
5599 | if (ret < 0) { | |
5600 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); | |
5601 | goto on_error; | |
5602 | } | |
5603 | ||
5604 | /* Tell child to proceed. */ | |
5605 | ret = lxc_write_nointr(sock_fds[1], &c, 1); | |
5606 | if (ret != 1) { | |
5607 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); | |
5608 | goto on_error; | |
5609 | } | |
5610 | ||
5611 | on_error: | |
5612 | close_prot_errno_disarm(sock_fds[0]); | |
5613 | close_prot_errno_disarm(sock_fds[1]); | |
5614 | ||
5615 | /* Wait for child to finish. */ | |
5616 | if (pid < 0) | |
e5af72a6 | 5617 | return log_error(-1, "Failed to create child process"); |
234998b4 | 5618 | |
07ea844f CB |
5619 | if (!wait_exited(pid)) |
5620 | return -1; | |
e5af72a6 CB |
5621 | |
5622 | return 0; | |
234998b4 CB |
5623 | } |
5624 | ||
a96a8e8c | 5625 | /* not thread-safe, do not use from api without first forking */ |
0fd73091 | 5626 | static char *getuname(void) |
97e9cfa0 | 5627 | { |
4f410b2a | 5628 | __do_free char *buf = NULL; |
cb7aa5e8 DJ |
5629 | struct passwd pwent; |
5630 | struct passwd *pwentp = NULL; | |
02d477cc | 5631 | ssize_t bufsize; |
cb7aa5e8 | 5632 | int ret; |
97e9cfa0 | 5633 | |
cb7aa5e8 | 5634 | bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); |
02d477cc | 5635 | if (bufsize < 0) |
cb7aa5e8 DJ |
5636 | bufsize = 1024; |
5637 | ||
b8e43ef0 | 5638 | buf = zalloc(bufsize); |
cb7aa5e8 | 5639 | if (!buf) |
97e9cfa0 SH |
5640 | return NULL; |
5641 | ||
cb7aa5e8 DJ |
5642 | ret = getpwuid_r(geteuid(), &pwent, buf, bufsize, &pwentp); |
5643 | if (!pwentp) { | |
5644 | if (ret == 0) | |
5645 | WARN("Could not find matched password record."); | |
5646 | ||
55022530 | 5647 | return log_error(NULL, "Failed to get password record - %u", geteuid()); |
cb7aa5e8 DJ |
5648 | } |
5649 | ||
4f410b2a | 5650 | return strdup(pwent.pw_name); |
97e9cfa0 SH |
5651 | } |
5652 | ||
a96a8e8c | 5653 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
5654 | static char *getgname(void) |
5655 | { | |
4f410b2a | 5656 | __do_free char *buf = NULL; |
3de9fb4c DJ |
5657 | struct group grent; |
5658 | struct group *grentp = NULL; | |
02d477cc | 5659 | ssize_t bufsize; |
3de9fb4c DJ |
5660 | int ret; |
5661 | ||
5662 | bufsize = sysconf(_SC_GETGR_R_SIZE_MAX); | |
02d477cc | 5663 | if (bufsize < 0) |
3de9fb4c DJ |
5664 | bufsize = 1024; |
5665 | ||
b8e43ef0 | 5666 | buf = zalloc(bufsize); |
3de9fb4c DJ |
5667 | if (!buf) |
5668 | return NULL; | |
5669 | ||
5670 | ret = getgrgid_r(getegid(), &grent, buf, bufsize, &grentp); | |
5671 | if (!grentp) { | |
5672 | if (ret == 0) | |
5673 | WARN("Could not find matched group record"); | |
97e9cfa0 | 5674 | |
55022530 | 5675 | return log_error(NULL, "Failed to get group record - %u", getegid()); |
3de9fb4c DJ |
5676 | } |
5677 | ||
4f410b2a | 5678 | return strdup(grent.gr_name); |
97e9cfa0 SH |
5679 | } |
5680 | ||
a96a8e8c | 5681 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
5682 | void suggest_default_idmap(void) |
5683 | { | |
3a6e3bf5 | 5684 | __do_free char *gname = NULL, *line = NULL, *uname = NULL; |
4aae564f | 5685 | __do_fclose FILE *subuid_f = NULL, *subgid_f = NULL; |
97e9cfa0 | 5686 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; |
97e9cfa0 SH |
5687 | size_t len = 0; |
5688 | ||
0fd73091 CB |
5689 | uname = getuname(); |
5690 | if (!uname) | |
97e9cfa0 SH |
5691 | return; |
5692 | ||
0fd73091 | 5693 | gname = getgname(); |
3a6e3bf5 | 5694 | if (!gname) |
97e9cfa0 | 5695 | return; |
97e9cfa0 | 5696 | |
4110345b | 5697 | subuid_f = fopen(subuidfile, "re"); |
4aae564f | 5698 | if (!subuid_f) { |
97e9cfa0 | 5699 | ERROR("Your system is not configured with subuids"); |
97e9cfa0 SH |
5700 | return; |
5701 | } | |
0fd73091 | 5702 | |
4aae564f | 5703 | while (getline(&line, &len, subuid_f) != -1) { |
0fd73091 | 5704 | char *p, *p2; |
b7930180 | 5705 | size_t no_newline = 0; |
0fd73091 CB |
5706 | |
5707 | p = strchr(line, ':'); | |
97e9cfa0 SH |
5708 | if (*line == '#') |
5709 | continue; | |
5710 | if (!p) | |
5711 | continue; | |
5712 | *p = '\0'; | |
5713 | p++; | |
0fd73091 | 5714 | |
71528742 | 5715 | if (!strequal(line, uname)) |
97e9cfa0 | 5716 | continue; |
0fd73091 | 5717 | |
97e9cfa0 SH |
5718 | p2 = strchr(p, ':'); |
5719 | if (!p2) | |
5720 | continue; | |
5721 | *p2 = '\0'; | |
5722 | p2++; | |
5723 | if (!*p2) | |
5724 | continue; | |
b7930180 CB |
5725 | no_newline = strcspn(p2, "\n"); |
5726 | p2[no_newline] = '\0'; | |
5727 | ||
b7b2fde4 | 5728 | if (lxc_safe_uint(p, &uid) < 0) |
0fd73091 | 5729 | WARN("Could not parse UID"); |
b7b2fde4 | 5730 | if (lxc_safe_uint(p2, &urange) < 0) |
0fd73091 | 5731 | WARN("Could not parse UID range"); |
97e9cfa0 | 5732 | } |
97e9cfa0 | 5733 | |
4110345b | 5734 | subgid_f = fopen(subgidfile, "re"); |
4aae564f | 5735 | if (!subgid_f) { |
97e9cfa0 | 5736 | ERROR("Your system is not configured with subgids"); |
97e9cfa0 SH |
5737 | return; |
5738 | } | |
0fd73091 | 5739 | |
4aae564f | 5740 | while (getline(&line, &len, subgid_f) != -1) { |
0fd73091 | 5741 | char *p, *p2; |
b7930180 | 5742 | size_t no_newline = 0; |
0fd73091 CB |
5743 | |
5744 | p = strchr(line, ':'); | |
97e9cfa0 SH |
5745 | if (*line == '#') |
5746 | continue; | |
5747 | if (!p) | |
5748 | continue; | |
5749 | *p = '\0'; | |
5750 | p++; | |
0fd73091 | 5751 | |
71528742 | 5752 | if (!strequal(line, uname)) |
97e9cfa0 | 5753 | continue; |
0fd73091 | 5754 | |
97e9cfa0 SH |
5755 | p2 = strchr(p, ':'); |
5756 | if (!p2) | |
5757 | continue; | |
5758 | *p2 = '\0'; | |
5759 | p2++; | |
5760 | if (!*p2) | |
5761 | continue; | |
b7930180 CB |
5762 | no_newline = strcspn(p2, "\n"); |
5763 | p2[no_newline] = '\0'; | |
5764 | ||
b7b2fde4 | 5765 | if (lxc_safe_uint(p, &gid) < 0) |
0fd73091 | 5766 | WARN("Could not parse GID"); |
b7b2fde4 | 5767 | if (lxc_safe_uint(p2, &grange) < 0) |
0fd73091 | 5768 | WARN("Could not parse GID range"); |
97e9cfa0 | 5769 | } |
97e9cfa0 | 5770 | |
97e9cfa0 SH |
5771 | if (!urange || !grange) { |
5772 | ERROR("You do not have subuids or subgids allocated"); | |
5773 | ERROR("Unprivileged containers require subuids and subgids"); | |
5774 | return; | |
5775 | } | |
5776 | ||
5777 | ERROR("You must either run as root, or define uid mappings"); | |
5778 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
5779 | ERROR("~/.config/lxc/default.conf:"); | |
5780 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
bdcbb6b3 CB |
5781 | ERROR("lxc.idmap = u 0 %u %u", uid, urange); |
5782 | ERROR("lxc.idmap = g 0 %u %u", gid, grange); | |
97e9cfa0 | 5783 | } |
aaf26830 | 5784 | |
c294a68d CB |
5785 | int lxc_set_environment(const struct lxc_conf *conf) |
5786 | { | |
5787 | struct environment_entry *env; | |
5788 | ||
5789 | list_for_each_entry(env, &conf->environment, head) { | |
5790 | int ret; | |
5791 | ||
5792 | ret = setenv(env->key, env->val, 1); | |
5793 | if (ret < 0) | |
5794 | return syserror("Failed to set environment variable: %s=%s", | |
5795 | env->key, env->val); | |
5796 | TRACE("Set environment variable: %s=%s", env->key, env->val); | |
5797 | } | |
5798 | ||
5799 | return 0; | |
5800 | } |