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Commit | Line | Data |
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cc73685d | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
1d52bdf7 | 2 | |
d38dd64a CB |
3 | #ifndef _GNU_SOURCE |
4 | #define _GNU_SOURCE 1 | |
5 | #endif | |
9d257a2a | 6 | #include <arpa/inet.h> |
8f3e280e CB |
7 | #include <dirent.h> |
8 | #include <errno.h> | |
9 | #include <fcntl.h> | |
10 | #include <grp.h> | |
11 | #include <inttypes.h> | |
12 | #include <libgen.h> | |
9d257a2a CB |
13 | #include <linux/loop.h> |
14 | #include <net/if.h> | |
15 | #include <netinet/in.h> | |
8f3e280e CB |
16 | #include <pwd.h> |
17 | #include <stdarg.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 | |
d38dd64a CB |
36 | #include "af_unix.h" |
37 | #include "caps.h" | |
38 | #include "cgroup.h" | |
bf651989 | 39 | #include "cgroup2_devices.h" |
d38dd64a CB |
40 | #include "conf.h" |
41 | #include "config.h" | |
42 | #include "confile.h" | |
43 | #include "confile_utils.h" | |
44 | #include "error.h" | |
45 | #include "log.h" | |
46 | #include "lsm/lsm.h" | |
47 | #include "lxclock.h" | |
48 | #include "lxcseccomp.h" | |
49 | #include "macro.h" | |
2f443e88 | 50 | #include "memory_utils.h" |
d38dd64a CB |
51 | #include "namespace.h" |
52 | #include "network.h" | |
53 | #include "parse.h" | |
13be2733 | 54 | #include "raw_syscalls.h" |
d38dd64a CB |
55 | #include "ringbuf.h" |
56 | #include "start.h" | |
57 | #include "storage.h" | |
58 | #include "storage/overlay.h" | |
6b3d24d7 | 59 | #include "syscall_wrappers.h" |
d38dd64a CB |
60 | #include "terminal.h" |
61 | #include "utils.h" | |
20502652 | 62 | #include "uuid.h" |
d38dd64a | 63 | |
af6824fc | 64 | #ifdef MAJOR_IN_MKDEV |
9d257a2a | 65 | #include <sys/mkdev.h> |
af6824fc | 66 | #endif |
af6824fc | 67 | |
614305f3 | 68 | #ifdef HAVE_STATVFS |
2938f7c8 | 69 | #include <sys/statvfs.h> |
614305f3 | 70 | #endif |
e827ff7e SG |
71 | |
72 | #if HAVE_PTY_H | |
b0a33c1e | 73 | #include <pty.h> |
e827ff7e SG |
74 | #else |
75 | #include <../include/openpty.h> | |
76 | #endif | |
0ad19a3f | 77 | |
9d257a2a CB |
78 | #if HAVE_LIBCAP |
79 | #include <sys/capability.h> | |
80 | #endif | |
81 | ||
82 | #if HAVE_SYS_PERSONALITY_H | |
83 | #include <sys/personality.h> | |
84 | #endif | |
85 | ||
f1e05b90 DJ |
86 | #ifndef HAVE_STRLCAT |
87 | #include "include/strlcat.h" | |
88 | #endif | |
89 | ||
9d257a2a CB |
90 | #if IS_BIONIC |
91 | #include <../include/lxcmntent.h> | |
92 | #else | |
93 | #include <mntent.h> | |
94 | #endif | |
95 | ||
96 | #if !defined(HAVE_PRLIMIT) && defined(HAVE_PRLIMIT64) | |
97 | #include <../include/prlimit.h> | |
98 | #endif | |
99 | ||
ac2cecc4 | 100 | lxc_log_define(conf, lxc); |
e5bda9ee | 101 | |
0fd73091 CB |
102 | /* The lxc_conf of the container currently being worked on in an API call. |
103 | * This is used in the error calls. | |
104 | */ | |
105 | #ifdef HAVE_TLS | |
d7f19646 | 106 | thread_local struct lxc_conf *current_config; |
0fd73091 CB |
107 | #else |
108 | struct lxc_conf *current_config; | |
109 | #endif | |
8912711c | 110 | |
0fd73091 CB |
111 | char *lxchook_names[NUM_LXC_HOOKS] = { |
112 | "pre-start", | |
113 | "pre-mount", | |
114 | "mount", | |
115 | "autodev", | |
116 | "start", | |
117 | "stop", | |
118 | "post-stop", | |
119 | "clone", | |
120 | "destroy", | |
121 | "start-host" | |
122 | }; | |
72d0e1cb | 123 | |
998ac676 RT |
124 | struct mount_opt { |
125 | char *name; | |
126 | int clear; | |
127 | int flag; | |
128 | }; | |
129 | ||
81810dd1 DL |
130 | struct caps_opt { |
131 | char *name; | |
132 | int value; | |
133 | }; | |
134 | ||
c6d09e15 WB |
135 | struct limit_opt { |
136 | char *name; | |
137 | int value; | |
138 | }; | |
139 | ||
998ac676 | 140 | static struct mount_opt mount_opt[] = { |
470b359b CB |
141 | { "async", 1, MS_SYNCHRONOUS }, |
142 | { "atime", 1, MS_NOATIME }, | |
143 | { "bind", 0, MS_BIND }, | |
88d413d5 | 144 | { "defaults", 0, 0 }, |
88d413d5 | 145 | { "dev", 1, MS_NODEV }, |
470b359b | 146 | { "diratime", 1, MS_NODIRATIME }, |
88d413d5 | 147 | { "dirsync", 0, MS_DIRSYNC }, |
470b359b | 148 | { "exec", 1, MS_NOEXEC }, |
8912711c | 149 | { "lazytime", 0, MS_LAZYTIME }, |
88d413d5 | 150 | { "mand", 0, MS_MANDLOCK }, |
88d413d5 | 151 | { "noatime", 0, MS_NOATIME }, |
470b359b | 152 | { "nodev", 0, MS_NODEV }, |
88d413d5 | 153 | { "nodiratime", 0, MS_NODIRATIME }, |
470b359b CB |
154 | { "noexec", 0, MS_NOEXEC }, |
155 | { "nomand", 1, MS_MANDLOCK }, | |
156 | { "norelatime", 1, MS_RELATIME }, | |
157 | { "nostrictatime", 1, MS_STRICTATIME }, | |
158 | { "nosuid", 0, MS_NOSUID }, | |
88d413d5 SW |
159 | { "rbind", 0, MS_BIND|MS_REC }, |
160 | { "relatime", 0, MS_RELATIME }, | |
470b359b CB |
161 | { "remount", 0, MS_REMOUNT }, |
162 | { "ro", 0, MS_RDONLY }, | |
163 | { "rw", 1, MS_RDONLY }, | |
88d413d5 | 164 | { "strictatime", 0, MS_STRICTATIME }, |
470b359b CB |
165 | { "suid", 1, MS_NOSUID }, |
166 | { "sync", 0, MS_SYNCHRONOUS }, | |
88d413d5 | 167 | { NULL, 0, 0 }, |
998ac676 RT |
168 | }; |
169 | ||
d840039e | 170 | static struct mount_opt propagation_opt[] = { |
0fd73091 CB |
171 | { "private", 0, MS_PRIVATE }, |
172 | { "shared", 0, MS_SHARED }, | |
173 | { "slave", 0, MS_SLAVE }, | |
174 | { "unbindable", 0, MS_UNBINDABLE }, | |
175 | { "rprivate", 0, MS_PRIVATE|MS_REC }, | |
176 | { "rshared", 0, MS_SHARED|MS_REC }, | |
177 | { "rslave", 0, MS_SLAVE|MS_REC }, | |
178 | { "runbindable", 0, MS_UNBINDABLE|MS_REC }, | |
179 | { NULL, 0, 0 }, | |
d840039e YT |
180 | }; |
181 | ||
81810dd1 | 182 | static struct caps_opt caps_opt[] = { |
8560cd36 | 183 | #if HAVE_LIBCAP |
0fd73091 CB |
184 | { "chown", CAP_CHOWN }, |
185 | { "dac_override", CAP_DAC_OVERRIDE }, | |
186 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
187 | { "fowner", CAP_FOWNER }, | |
188 | { "fsetid", CAP_FSETID }, | |
189 | { "kill", CAP_KILL }, | |
190 | { "setgid", CAP_SETGID }, | |
191 | { "setuid", CAP_SETUID }, | |
192 | { "setpcap", CAP_SETPCAP }, | |
193 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
194 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
195 | { "net_broadcast", CAP_NET_BROADCAST }, | |
196 | { "net_admin", CAP_NET_ADMIN }, | |
197 | { "net_raw", CAP_NET_RAW }, | |
198 | { "ipc_lock", CAP_IPC_LOCK }, | |
199 | { "ipc_owner", CAP_IPC_OWNER }, | |
200 | { "sys_module", CAP_SYS_MODULE }, | |
201 | { "sys_rawio", CAP_SYS_RAWIO }, | |
202 | { "sys_chroot", CAP_SYS_CHROOT }, | |
203 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
204 | { "sys_pacct", CAP_SYS_PACCT }, | |
205 | { "sys_admin", CAP_SYS_ADMIN }, | |
206 | { "sys_boot", CAP_SYS_BOOT }, | |
207 | { "sys_nice", CAP_SYS_NICE }, | |
208 | { "sys_resource", CAP_SYS_RESOURCE }, | |
209 | { "sys_time", CAP_SYS_TIME }, | |
210 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
211 | { "mknod", CAP_MKNOD }, | |
212 | { "lease", CAP_LEASE }, | |
57b837e2 | 213 | #ifdef CAP_AUDIT_READ |
0fd73091 | 214 | { "audit_read", CAP_AUDIT_READ }, |
57b837e2 | 215 | #endif |
9527e566 | 216 | #ifdef CAP_AUDIT_WRITE |
0fd73091 | 217 | { "audit_write", CAP_AUDIT_WRITE }, |
9527e566 FW |
218 | #endif |
219 | #ifdef CAP_AUDIT_CONTROL | |
0fd73091 | 220 | { "audit_control", CAP_AUDIT_CONTROL }, |
9527e566 | 221 | #endif |
0fd73091 CB |
222 | { "setfcap", CAP_SETFCAP }, |
223 | { "mac_override", CAP_MAC_OVERRIDE }, | |
224 | { "mac_admin", CAP_MAC_ADMIN }, | |
5170c716 | 225 | #ifdef CAP_SYSLOG |
0fd73091 | 226 | { "syslog", CAP_SYSLOG }, |
5170c716 CS |
227 | #endif |
228 | #ifdef CAP_WAKE_ALARM | |
0fd73091 | 229 | { "wake_alarm", CAP_WAKE_ALARM }, |
5170c716 | 230 | #endif |
2b54359b | 231 | #ifdef CAP_BLOCK_SUSPEND |
0fd73091 | 232 | { "block_suspend", CAP_BLOCK_SUSPEND }, |
2b54359b | 233 | #endif |
495d2046 | 234 | #endif |
8560cd36 | 235 | }; |
81810dd1 | 236 | |
c6d09e15 WB |
237 | static struct limit_opt limit_opt[] = { |
238 | #ifdef RLIMIT_AS | |
239 | { "as", RLIMIT_AS }, | |
240 | #endif | |
241 | #ifdef RLIMIT_CORE | |
242 | { "core", RLIMIT_CORE }, | |
243 | #endif | |
244 | #ifdef RLIMIT_CPU | |
245 | { "cpu", RLIMIT_CPU }, | |
246 | #endif | |
247 | #ifdef RLIMIT_DATA | |
248 | { "data", RLIMIT_DATA }, | |
249 | #endif | |
250 | #ifdef RLIMIT_FSIZE | |
251 | { "fsize", RLIMIT_FSIZE }, | |
252 | #endif | |
253 | #ifdef RLIMIT_LOCKS | |
254 | { "locks", RLIMIT_LOCKS }, | |
255 | #endif | |
256 | #ifdef RLIMIT_MEMLOCK | |
257 | { "memlock", RLIMIT_MEMLOCK }, | |
258 | #endif | |
259 | #ifdef RLIMIT_MSGQUEUE | |
260 | { "msgqueue", RLIMIT_MSGQUEUE }, | |
261 | #endif | |
262 | #ifdef RLIMIT_NICE | |
263 | { "nice", RLIMIT_NICE }, | |
264 | #endif | |
265 | #ifdef RLIMIT_NOFILE | |
266 | { "nofile", RLIMIT_NOFILE }, | |
267 | #endif | |
268 | #ifdef RLIMIT_NPROC | |
269 | { "nproc", RLIMIT_NPROC }, | |
270 | #endif | |
271 | #ifdef RLIMIT_RSS | |
272 | { "rss", RLIMIT_RSS }, | |
273 | #endif | |
274 | #ifdef RLIMIT_RTPRIO | |
275 | { "rtprio", RLIMIT_RTPRIO }, | |
276 | #endif | |
277 | #ifdef RLIMIT_RTTIME | |
278 | { "rttime", RLIMIT_RTTIME }, | |
279 | #endif | |
280 | #ifdef RLIMIT_SIGPENDING | |
281 | { "sigpending", RLIMIT_SIGPENDING }, | |
282 | #endif | |
283 | #ifdef RLIMIT_STACK | |
284 | { "stack", RLIMIT_STACK }, | |
285 | #endif | |
286 | }; | |
287 | ||
91c3830e SH |
288 | static int run_buffer(char *buffer) |
289 | { | |
cc6a0e78 | 290 | __do_free char *output = NULL; |
55022530 | 291 | __do_lxc_pclose struct lxc_popen_FILE *f = NULL; |
ebf3a6af | 292 | int fd, ret; |
91c3830e | 293 | |
ebec9176 | 294 | f = lxc_popen(buffer); |
55022530 CB |
295 | if (!f) |
296 | return log_error_errno(-1, errno, "Failed to popen() %s", buffer); | |
91c3830e SH |
297 | |
298 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
55022530 CB |
299 | if (!output) |
300 | return log_error_errno(-1, ENOMEM, "Failed to allocate memory for %s", buffer); | |
91c3830e | 301 | |
ebf3a6af | 302 | fd = fileno(f->f); |
55022530 CB |
303 | if (fd < 0) |
304 | return log_error_errno(-1, errno, "Failed to retrieve underlying file descriptor"); | |
ebf3a6af CB |
305 | |
306 | for (int i = 0; i < 10; i++) { | |
307 | ssize_t bytes_read; | |
308 | ||
309 | bytes_read = lxc_read_nointr(fd, output, LXC_LOG_BUFFER_SIZE - 1); | |
310 | if (bytes_read > 0) { | |
311 | output[bytes_read] = '\0'; | |
312 | DEBUG("Script %s produced output: %s", buffer, output); | |
313 | continue; | |
314 | } | |
315 | ||
316 | break; | |
317 | } | |
91c3830e | 318 | |
55022530 CB |
319 | ret = lxc_pclose(move_ptr(f)); |
320 | if (ret == -1) | |
321 | return log_error_errno(-1, errno, "Script exited with error"); | |
322 | else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) | |
323 | return log_error(-1, "Script exited with status %d", WEXITSTATUS(ret)); | |
324 | else if (WIFSIGNALED(ret)) | |
325 | return log_error(-1, "Script terminated by signal %d", WTERMSIG(ret)); | |
91c3830e SH |
326 | |
327 | return 0; | |
328 | } | |
329 | ||
14a7b0f9 CB |
330 | int run_script_argv(const char *name, unsigned int hook_version, |
331 | const char *section, const char *script, | |
586b1ce7 | 332 | const char *hookname, char **argv) |
148e91f5 | 333 | { |
e1a94937 | 334 | __do_free char *buffer = NULL; |
3f60c2f7 | 335 | int buf_pos, i, ret; |
d08e5708 | 336 | size_t size = 0; |
148e91f5 | 337 | |
3f60c2f7 | 338 | if (hook_version == 0) |
55022530 CB |
339 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\"", |
340 | script, name, section); | |
3f60c2f7 CB |
341 | else |
342 | INFO("Executing script \"%s\" for container \"%s\"", script, name); | |
148e91f5 | 343 | |
586b1ce7 CB |
344 | for (i = 0; argv && argv[i]; i++) |
345 | size += strlen(argv[i]) + 1; | |
148e91f5 | 346 | |
6333c915 CB |
347 | size += STRLITERALLEN("exec"); |
348 | size++; | |
148e91f5 | 349 | size += strlen(script); |
3f60c2f7 CB |
350 | size++; |
351 | ||
148e91f5 | 352 | if (size > INT_MAX) |
3f60c2f7 | 353 | return -EFBIG; |
148e91f5 | 354 | |
3f60c2f7 | 355 | if (hook_version == 0) { |
d08e5708 CB |
356 | size += strlen(hookname); |
357 | size++; | |
358 | ||
359 | size += strlen(name); | |
360 | size++; | |
361 | ||
362 | size += strlen(section); | |
363 | size++; | |
364 | ||
365 | if (size > INT_MAX) | |
366 | return -EFBIG; | |
327cce76 | 367 | } |
3f60c2f7 | 368 | |
6f8d00d2 CB |
369 | buffer = malloc(size); |
370 | if (!buffer) | |
371 | return -ENOMEM; | |
372 | ||
327cce76 | 373 | if (hook_version == 0) |
3f60c2f7 | 374 | buf_pos = snprintf(buffer, size, "exec %s %s %s %s", script, name, section, hookname); |
327cce76 | 375 | else |
3f60c2f7 | 376 | buf_pos = snprintf(buffer, size, "exec %s", script); |
55022530 CB |
377 | if (buf_pos < 0 || (size_t)buf_pos >= size) |
378 | return log_error_errno(-1, errno, "Failed to create command line for script \"%s\"", script); | |
3f60c2f7 | 379 | |
327cce76 | 380 | if (hook_version == 1) { |
3f60c2f7 CB |
381 | ret = setenv("LXC_HOOK_TYPE", hookname, 1); |
382 | if (ret < 0) { | |
55022530 | 383 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_HOOK_TYPE=%s", hookname); |
3f60c2f7 | 384 | } |
90f20466 | 385 | TRACE("Set environment variable: LXC_HOOK_TYPE=%s", hookname); |
3f60c2f7 CB |
386 | |
387 | ret = setenv("LXC_HOOK_SECTION", section, 1); | |
55022530 CB |
388 | if (ret < 0) |
389 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_HOOK_SECTION=%s", section); | |
3f60c2f7 | 390 | TRACE("Set environment variable: LXC_HOOK_SECTION=%s", section); |
14a7b0f9 CB |
391 | |
392 | if (strcmp(section, "net") == 0) { | |
393 | char *parent; | |
394 | ||
586b1ce7 | 395 | if (!argv || !argv[0]) |
e1a94937 | 396 | return -1; |
14a7b0f9 | 397 | |
586b1ce7 | 398 | ret = setenv("LXC_NET_TYPE", argv[0], 1); |
55022530 CB |
399 | if (ret < 0) |
400 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_TYPE=%s", argv[0]); | |
586b1ce7 | 401 | TRACE("Set environment variable: LXC_NET_TYPE=%s", argv[0]); |
14a7b0f9 | 402 | |
586b1ce7 | 403 | parent = argv[1] ? argv[1] : ""; |
14a7b0f9 | 404 | |
a8144263 | 405 | if (strcmp(argv[0], "macvlan") == 0) { |
14a7b0f9 | 406 | ret = setenv("LXC_NET_PARENT", parent, 1); |
55022530 CB |
407 | if (ret < 0) |
408 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_PARENT=%s", parent); | |
14a7b0f9 | 409 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); |
a8144263 | 410 | } else if (strcmp(argv[0], "phys") == 0) { |
14a7b0f9 | 411 | ret = setenv("LXC_NET_PARENT", parent, 1); |
55022530 CB |
412 | if (ret < 0) |
413 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_PARENT=%s", parent); | |
14a7b0f9 | 414 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); |
a8144263 | 415 | } else if (strcmp(argv[0], "veth") == 0) { |
586b1ce7 | 416 | char *peer = argv[2] ? argv[2] : ""; |
14a7b0f9 CB |
417 | |
418 | ret = setenv("LXC_NET_PEER", peer, 1); | |
55022530 CB |
419 | if (ret < 0) |
420 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_PEER=%s", peer); | |
14a7b0f9 CB |
421 | TRACE("Set environment variable: LXC_NET_PEER=%s", peer); |
422 | ||
423 | ret = setenv("LXC_NET_PARENT", parent, 1); | |
55022530 CB |
424 | if (ret < 0) |
425 | return log_error_errno(-1, errno, "Failed to set environment variable: LXC_NET_PARENT=%s", parent); | |
14a7b0f9 CB |
426 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); |
427 | } | |
428 | } | |
148e91f5 SH |
429 | } |
430 | ||
586b1ce7 | 431 | for (i = 0; argv && argv[i]; i++) { |
3f60c2f7 CB |
432 | size_t len = size - buf_pos; |
433 | ||
586b1ce7 | 434 | ret = snprintf(buffer + buf_pos, len, " %s", argv[i]); |
55022530 CB |
435 | if (ret < 0 || (size_t)ret >= len) |
436 | return log_error_errno(-1, errno, "Failed to create command line for script \"%s\"", script); | |
3f60c2f7 | 437 | buf_pos += ret; |
148e91f5 SH |
438 | } |
439 | ||
e1a94937 | 440 | return run_buffer(buffer); |
148e91f5 SH |
441 | } |
442 | ||
811ef482 | 443 | int run_script(const char *name, const char *section, const char *script, ...) |
e3b4c4c4 | 444 | { |
2f443e88 | 445 | __do_free char *buffer = NULL; |
abbfd20b | 446 | int ret; |
2f443e88 | 447 | char *p; |
abbfd20b | 448 | va_list ap; |
0fd73091 | 449 | size_t size = 0; |
751d9dcd | 450 | |
0fd73091 | 451 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\"", |
751d9dcd | 452 | script, name, section); |
e3b4c4c4 | 453 | |
abbfd20b DL |
454 | va_start(ap, script); |
455 | while ((p = va_arg(ap, char *))) | |
95642a10 | 456 | size += strlen(p) + 1; |
abbfd20b DL |
457 | va_end(ap); |
458 | ||
6333c915 | 459 | size += STRLITERALLEN("exec"); |
abbfd20b DL |
460 | size += strlen(script); |
461 | size += strlen(name); | |
462 | size += strlen(section); | |
6d1a5f93 | 463 | size += 4; |
abbfd20b | 464 | |
95642a10 MS |
465 | if (size > INT_MAX) |
466 | return -1; | |
467 | ||
2f443e88 | 468 | buffer = must_realloc(NULL, size); |
6d1a5f93 | 469 | ret = snprintf(buffer, size, "exec %s %s %s", script, name, section); |
0fd73091 | 470 | if (ret < 0 || ret >= size) |
9ba8130c | 471 | return -1; |
751d9dcd | 472 | |
abbfd20b | 473 | va_start(ap, script); |
9ba8130c | 474 | while ((p = va_arg(ap, char *))) { |
062b72c6 | 475 | int len = size - ret; |
9ba8130c SH |
476 | int rc; |
477 | rc = snprintf(buffer + ret, len, " %s", p); | |
7b5a2435 DJ |
478 | if (rc < 0 || rc >= len) { |
479 | va_end(ap); | |
9ba8130c | 480 | return -1; |
7b5a2435 | 481 | } |
9ba8130c SH |
482 | ret += rc; |
483 | } | |
abbfd20b | 484 | va_end(ap); |
751d9dcd | 485 | |
91c3830e | 486 | return run_buffer(buffer); |
e3b4c4c4 ST |
487 | } |
488 | ||
0fd73091 | 489 | /* pin_rootfs |
63fc76c3 | 490 | * if rootfs is a directory, then open ${rootfs}/.lxc-keep for writing for |
b7ed4bf0 CS |
491 | * the duration of the container run, to prevent the container from marking |
492 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
63fc76c3 GJ |
493 | * no name pollution is happens. |
494 | * don't unlink on NFS to avoid random named stale handles. | |
0c547523 SH |
495 | * return -1 on error. |
496 | * return -2 if nothing needed to be pinned. | |
497 | * return an open fd (>=0) if we pinned it. | |
498 | */ | |
499 | int pin_rootfs(const char *rootfs) | |
500 | { | |
957c4704 | 501 | __do_free char *absrootfs = NULL; |
0fd73091 | 502 | int fd, ret; |
6b5a54cd | 503 | char absrootfspin[PATH_MAX]; |
0c547523 | 504 | struct stat s; |
63fc76c3 | 505 | struct statfs sfs; |
0c547523 | 506 | |
e99ee0de | 507 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 508 | return -2; |
e99ee0de | 509 | |
74e7b662 | 510 | absrootfs = realpath(rootfs, NULL); |
511 | if (!absrootfs) | |
9be53773 | 512 | return -2; |
0c547523 | 513 | |
0fd73091 | 514 | ret = stat(absrootfs, &s); |
957c4704 | 515 | if (ret < 0) |
0c547523 | 516 | return -1; |
0c547523 | 517 | |
957c4704 | 518 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
519 | return -2; |
520 | ||
55022530 CB |
521 | ret = snprintf(absrootfspin, sizeof(absrootfspin), "%s/.lxc-keep", absrootfs); |
522 | if (ret < 0 || (size_t)ret >= sizeof(absrootfspin)) | |
0c547523 | 523 | return -1; |
0c547523 | 524 | |
55022530 | 525 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR | S_IRUSR | O_CLOEXEC); |
b7ed4bf0 CS |
526 | if (fd < 0) |
527 | return fd; | |
0fd73091 | 528 | |
205fc010 CB |
529 | ret = fstatfs (fd, &sfs); |
530 | if (ret < 0) | |
531 | return fd; | |
63fc76c3 | 532 | |
55022530 CB |
533 | if (sfs.f_type == NFS_SUPER_MAGIC) |
534 | return log_debug(fd, "Rootfs on NFS, not unlinking pin file \"%s\"", absrootfspin); | |
63fc76c3 | 535 | |
b7ed4bf0 | 536 | (void)unlink(absrootfspin); |
0fd73091 | 537 | |
0c547523 SH |
538 | return fd; |
539 | } | |
540 | ||
0fd73091 CB |
541 | /* If we are asking to remount something, make sure that any NOEXEC etc are |
542 | * honored. | |
e2a7e8dc | 543 | */ |
5ae72b98 | 544 | unsigned long add_required_remount_flags(const char *s, const char *d, |
5285689c | 545 | unsigned long flags) |
e2a7e8dc | 546 | { |
614305f3 | 547 | #ifdef HAVE_STATVFS |
0fd73091 | 548 | int ret; |
e2a7e8dc SH |
549 | struct statvfs sb; |
550 | unsigned long required_flags = 0; | |
551 | ||
e2a7e8dc SH |
552 | if (!s) |
553 | s = d; | |
554 | ||
555 | if (!s) | |
556 | return flags; | |
0fd73091 CB |
557 | |
558 | ret = statvfs(s, &sb); | |
559 | if (ret < 0) | |
e2a7e8dc SH |
560 | return flags; |
561 | ||
69eadddb CB |
562 | if (flags & MS_REMOUNT) { |
563 | if (sb.f_flag & MS_NOSUID) | |
564 | required_flags |= MS_NOSUID; | |
565 | if (sb.f_flag & MS_NODEV) | |
566 | required_flags |= MS_NODEV; | |
567 | if (sb.f_flag & MS_RDONLY) | |
568 | required_flags |= MS_RDONLY; | |
569 | if (sb.f_flag & MS_NOEXEC) | |
570 | required_flags |= MS_NOEXEC; | |
571 | } | |
572 | ||
573 | if (sb.f_flag & MS_NOATIME) | |
574 | required_flags |= MS_NOATIME; | |
575 | if (sb.f_flag & MS_NODIRATIME) | |
576 | required_flags |= MS_NODIRATIME; | |
577 | if (sb.f_flag & MS_LAZYTIME) | |
578 | required_flags |= MS_LAZYTIME; | |
579 | if (sb.f_flag & MS_RELATIME) | |
580 | required_flags |= MS_RELATIME; | |
581 | if (sb.f_flag & MS_STRICTATIME) | |
582 | required_flags |= MS_STRICTATIME; | |
e2a7e8dc SH |
583 | |
584 | return flags | required_flags; | |
614305f3 SH |
585 | #else |
586 | return flags; | |
587 | #endif | |
e2a7e8dc SH |
588 | } |
589 | ||
6b741397 CB |
590 | static int add_shmount_to_list(struct lxc_conf *conf) |
591 | { | |
6b5a54cd | 592 | char new_mount[PATH_MAX]; |
0d190408 | 593 | /* Offset for the leading '/' since the path_cont |
6b741397 CB |
594 | * is absolute inside the container. |
595 | */ | |
596 | int offset = 1, ret = -1; | |
0d190408 | 597 | |
6b741397 CB |
598 | ret = snprintf(new_mount, sizeof(new_mount), |
599 | "%s %s none bind,create=dir 0 0", conf->shmount.path_host, | |
600 | conf->shmount.path_cont + offset); | |
60534030 | 601 | if (ret < 0 || (size_t)ret >= sizeof(new_mount)) |
0d190408 LT |
602 | return -1; |
603 | ||
6b741397 | 604 | return add_elem_to_mount_list(new_mount, conf); |
0d190408 LT |
605 | } |
606 | ||
4fb3cba5 | 607 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 608 | { |
0fd73091 | 609 | int i, r; |
b06b8511 CS |
610 | static struct { |
611 | int match_mask; | |
612 | int match_flag; | |
613 | const char *source; | |
614 | const char *destination; | |
615 | const char *fstype; | |
616 | unsigned long flags; | |
617 | const char *options; | |
618 | } default_mounts[] = { | |
0fd73091 CB |
619 | /* Read-only bind-mounting... In older kernels, doing that |
620 | * required to do one MS_BIND mount and then | |
621 | * MS_REMOUNT|MS_RDONLY the same one. According to mount(2) | |
622 | * manpage, MS_BIND honors MS_RDONLY from kernel 2.6.26 | |
623 | * onwards. However, this apparently does not work on kernel | |
624 | * 3.8. Unfortunately, on that very same kernel, doing the same | |
625 | * trick as above doesn't seem to work either, there one needs | |
626 | * to ALSO specify MS_BIND for the remount, otherwise the | |
627 | * entire fs is remounted read-only or the mount fails because | |
628 | * it's busy... MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for | |
629 | * kernels as low as 2.6.32... | |
368bbc02 | 630 | */ |
0fd73091 | 631 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
592fd47a | 632 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
0fd73091 CB |
633 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL }, |
634 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, | |
635 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
636 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL }, | |
637 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, | |
638 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
639 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
640 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
641 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
642 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
d1c203f4 | 643 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys", "%r/sys", NULL, MS_BIND, NULL }, |
0fd73091 CB |
644 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, |
645 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
646 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys/devices/virtual/net/devices/virtual/net", "%r/sys/devices/virtual/net", NULL, MS_BIND, NULL }, | |
647 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys/devices/virtual/net", NULL, MS_REMOUNT|MS_BIND|MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL }, | |
648 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 649 | }; |
368bbc02 | 650 | |
b06b8511 | 651 | for (i = 0; default_mounts[i].match_mask; i++) { |
8db92302 | 652 | __do_free char *destination = NULL, *source = NULL; |
0fd73091 CB |
653 | int saved_errno; |
654 | unsigned long mflags; | |
0fd73091 CB |
655 | if ((flags & default_mounts[i].match_mask) != default_mounts[i].match_flag) |
656 | continue; | |
657 | ||
658 | if (default_mounts[i].source) { | |
cc4fd506 | 659 | /* will act like strdup if %r is not present */ |
0fd73091 CB |
660 | source = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].source); |
661 | if (!source) | |
cc4fd506 | 662 | return -1; |
0fd73091 | 663 | } |
f24a52d5 | 664 | |
55022530 CB |
665 | if (!default_mounts[i].destination) |
666 | return log_error(-1, "BUG: auto mounts destination %d was NULL", i); | |
0fd73091 CB |
667 | |
668 | /* will act like strdup if %r is not present */ | |
669 | destination = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].destination); | |
55022530 | 670 | if (!destination) |
0fd73091 | 671 | return -1; |
0fd73091 CB |
672 | |
673 | mflags = add_required_remount_flags(source, destination, | |
674 | default_mounts[i].flags); | |
675 | r = safe_mount(source, destination, default_mounts[i].fstype, | |
676 | mflags, default_mounts[i].options, | |
677 | conf->rootfs.path ? conf->rootfs.mount : NULL); | |
678 | saved_errno = errno; | |
679 | if (r < 0 && errno == ENOENT) { | |
55022530 | 680 | INFO("Mount source or target for \"%s\" on \"%s\" does not exist. Skipping", source, destination); |
0fd73091 CB |
681 | r = 0; |
682 | } else if (r < 0) { | |
683 | SYSERROR("Failed to mount \"%s\" on \"%s\" with flags %lu", source, destination, mflags); | |
684 | } | |
685 | ||
0fd73091 CB |
686 | if (r < 0) { |
687 | errno = saved_errno; | |
688 | return -1; | |
368bbc02 | 689 | } |
368bbc02 CS |
690 | } |
691 | ||
b06b8511 | 692 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
693 | int cg_flags; |
694 | ||
3f69fb12 | 695 | cg_flags = flags & (LXC_AUTO_CGROUP_MASK & ~LXC_AUTO_CGROUP_FORCE); |
0fd73091 CB |
696 | /* If the type of cgroup mount was not specified, it depends on |
697 | * the container's capabilities as to what makes sense: if we | |
698 | * have CAP_SYS_ADMIN, the read-only part can be remounted | |
699 | * read-write anyway, so we may as well default to read-write; | |
700 | * then the admin will not be given a false sense of security. | |
701 | * (And if they really want mixed r/o r/w, then they can | |
702 | * explicitly specify :mixed.) OTOH, if the container lacks | |
703 | * CAP_SYS_ADMIN, do only default to :mixed, because then the | |
704 | * container can't remount it read-write. | |
705 | */ | |
0769b82a CS |
706 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { |
707 | int has_sys_admin = 0; | |
b0ee5983 CB |
708 | |
709 | if (!lxc_list_empty(&conf->keepcaps)) | |
0769b82a | 710 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); |
b0ee5983 | 711 | else |
0769b82a | 712 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); |
b0ee5983 CB |
713 | |
714 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) | |
0769b82a | 715 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; |
b0ee5983 | 716 | else |
0769b82a | 717 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; |
0769b82a | 718 | } |
0fd73091 | 719 | |
3f69fb12 | 720 | if (flags & LXC_AUTO_CGROUP_FORCE) |
0fd73091 CB |
721 | cg_flags |= LXC_AUTO_CGROUP_FORCE; |
722 | ||
2202afc9 CB |
723 | if (!handler->cgroup_ops->mount(handler->cgroup_ops, |
724 | handler, | |
725 | conf->rootfs.path ? conf->rootfs.mount : "", | |
55022530 CB |
726 | cg_flags)) |
727 | return log_error_errno(-1, errno, "Failed to mount \"/sys/fs/cgroup\""); | |
368bbc02 CS |
728 | } |
729 | ||
0d190408 LT |
730 | if (flags & LXC_AUTO_SHMOUNTS_MASK) { |
731 | int ret = add_shmount_to_list(conf); | |
55022530 CB |
732 | if (ret < 0) |
733 | return log_error(-1, "Failed to add shmount entry to container config"); | |
0d190408 LT |
734 | } |
735 | ||
368bbc02 | 736 | return 0; |
368bbc02 CS |
737 | } |
738 | ||
4e5440c6 | 739 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 740 | { |
0fd73091 CB |
741 | int ret; |
742 | ||
4e5440c6 DL |
743 | if (!utsname) |
744 | return 0; | |
0ad19a3f | 745 | |
0fd73091 | 746 | ret = sethostname(utsname->nodename, strlen(utsname->nodename)); |
55022530 CB |
747 | if (ret < 0) |
748 | return log_error_errno(-1, errno, "Failed to set the hostname to \"%s\"", | |
749 | utsname->nodename); | |
0ad19a3f | 750 | |
0fd73091 | 751 | INFO("Set hostname to \"%s\"", utsname->nodename); |
cd54d859 | 752 | |
0ad19a3f | 753 | return 0; |
754 | } | |
755 | ||
69aa6655 DE |
756 | struct dev_symlinks { |
757 | const char *oldpath; | |
758 | const char *name; | |
759 | }; | |
760 | ||
761 | static const struct dev_symlinks dev_symlinks[] = { | |
0fd73091 CB |
762 | { "/proc/self/fd", "fd" }, |
763 | { "/proc/self/fd/0", "stdin" }, | |
764 | { "/proc/self/fd/1", "stdout" }, | |
765 | { "/proc/self/fd/2", "stderr" }, | |
69aa6655 DE |
766 | }; |
767 | ||
ed8704d0 | 768 | static int lxc_setup_dev_symlinks(const struct lxc_rootfs *rootfs) |
69aa6655 | 769 | { |
0fd73091 | 770 | int i, ret; |
6b5a54cd | 771 | char path[PATH_MAX]; |
09227be2 | 772 | struct stat s; |
69aa6655 | 773 | |
69aa6655 DE |
774 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { |
775 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
0fd73091 CB |
776 | |
777 | ret = snprintf(path, sizeof(path), "%s/dev/%s", | |
778 | rootfs->path ? rootfs->mount : "", d->name); | |
55022530 | 779 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
69aa6655 | 780 | return -1; |
09227be2 | 781 | |
0fd73091 CB |
782 | /* Stat the path first. If we don't get an error accept it as |
783 | * is and don't try to create it | |
09227be2 | 784 | */ |
0fd73091 CB |
785 | ret = stat(path, &s); |
786 | if (ret == 0) | |
09227be2 | 787 | continue; |
09227be2 | 788 | |
69aa6655 DE |
789 | ret = symlink(d->oldpath, path); |
790 | if (ret && errno != EEXIST) { | |
55022530 | 791 | if (errno == EROFS) |
0fd73091 | 792 | WARN("Failed to create \"%s\". Read-only filesystem", path); |
55022530 CB |
793 | else |
794 | return log_error_errno(-1, errno, "Failed to create \"%s\"", path); | |
69aa6655 DE |
795 | } |
796 | } | |
0fd73091 | 797 | |
69aa6655 DE |
798 | return 0; |
799 | } | |
800 | ||
2187efd3 | 801 | /* Build a space-separate list of ptys to pass to systemd. */ |
885766f5 | 802 | static bool append_ttyname(char **pp, char *name) |
b0a33c1e | 803 | { |
393903d1 | 804 | char *p; |
f1e05b90 | 805 | size_t size; |
393903d1 SH |
806 | |
807 | if (!*pp) { | |
808 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
809 | if (!*pp) | |
810 | return false; | |
0fd73091 | 811 | |
393903d1 SH |
812 | sprintf(*pp, "container_ttys=%s", name); |
813 | return true; | |
814 | } | |
0fd73091 | 815 | |
f1e05b90 DJ |
816 | size = strlen(*pp) + strlen(name) + 2; |
817 | p = realloc(*pp, size); | |
393903d1 SH |
818 | if (!p) |
819 | return false; | |
0fd73091 | 820 | |
393903d1 | 821 | *pp = p; |
f1e05b90 DJ |
822 | (void)strlcat(p, " ", size); |
823 | (void)strlcat(p, name, size); | |
0fd73091 | 824 | |
393903d1 SH |
825 | return true; |
826 | } | |
827 | ||
2187efd3 | 828 | static int lxc_setup_ttys(struct lxc_conf *conf) |
393903d1 | 829 | { |
9e1045e3 | 830 | int i, ret; |
0e4be3cf | 831 | const struct lxc_tty_info *ttys = &conf->ttys; |
885766f5 | 832 | char *ttydir = ttys->dir; |
6b5a54cd | 833 | char path[PATH_MAX], lxcpath[PATH_MAX]; |
b0a33c1e | 834 | |
e8bd4e43 | 835 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
836 | return 0; |
837 | ||
885766f5 | 838 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 839 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
b0a33c1e | 840 | |
e8bd4e43 | 841 | ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1); |
73363c61 | 842 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 843 | return -1; |
9e1045e3 | 844 | |
7c6ef2a2 SH |
845 | if (ttydir) { |
846 | /* create dev/lxc/tty%d" */ | |
9e1045e3 CB |
847 | ret = snprintf(lxcpath, sizeof(lxcpath), |
848 | "/dev/%s/tty%d", ttydir, i + 1); | |
73363c61 | 849 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
7c6ef2a2 | 850 | return -1; |
9e1045e3 | 851 | |
adc1c715 | 852 | ret = mknod(lxcpath, S_IFREG | 0000, 0); |
9e1045e3 | 853 | if (ret < 0 && errno != EEXIST) { |
73363c61 | 854 | SYSERROR("Failed to create \"%s\"", lxcpath); |
7c6ef2a2 SH |
855 | return -1; |
856 | } | |
9e1045e3 | 857 | |
7c6ef2a2 | 858 | ret = unlink(path); |
9e1045e3 | 859 | if (ret < 0 && errno != ENOENT) { |
73363c61 | 860 | SYSERROR("Failed to unlink \"%s\"", path); |
7c6ef2a2 SH |
861 | return -1; |
862 | } | |
b0a33c1e | 863 | |
2520facd | 864 | ret = mount(tty->name, lxcpath, "none", MS_BIND, 0); |
9e1045e3 | 865 | if (ret < 0) { |
55022530 | 866 | SYSWARN("Failed to bind mount \"%s\" onto \"%s\"", tty->name, lxcpath); |
7c6ef2a2 SH |
867 | continue; |
868 | } | |
55022530 | 869 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, lxcpath); |
13954cce | 870 | |
9e1045e3 CB |
871 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", |
872 | ttydir, i + 1); | |
73363c61 | 873 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
9ba8130c | 874 | return -1; |
9e1045e3 | 875 | |
7c6ef2a2 | 876 | ret = symlink(lxcpath, path); |
55022530 CB |
877 | if (ret < 0) |
878 | return log_error_errno(-1, errno, "Failed to create symlink \"%s\" -> \"%s\"", path, lxcpath); | |
7c6ef2a2 | 879 | } else { |
9e1045e3 CB |
880 | /* If we populated /dev, then we need to create |
881 | * /dev/ttyN | |
882 | */ | |
d3ccc04e CB |
883 | ret = mknod(path, S_IFREG | 0000, 0); |
884 | if (ret < 0) /* this isn't fatal, continue */ | |
6d1400b5 | 885 | SYSERROR("Failed to create \"%s\"", path); |
9e1045e3 | 886 | |
2520facd | 887 | ret = mount(tty->name, path, "none", MS_BIND, 0); |
9e1045e3 | 888 | if (ret < 0) { |
2520facd | 889 | SYSERROR("Failed to mount '%s'->'%s'", tty->name, path); |
7c6ef2a2 SH |
890 | continue; |
891 | } | |
9e1045e3 | 892 | |
d3ccc04e | 893 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, path); |
393903d1 | 894 | } |
9e1045e3 | 895 | |
55022530 CB |
896 | if (!append_ttyname(&conf->ttys.tty_names, tty->name)) |
897 | return log_error(-1, "Error setting up container_ttys string"); | |
b0a33c1e | 898 | } |
899 | ||
885766f5 | 900 | INFO("Finished setting up %zu /dev/tty<N> device(s)", ttys->max); |
b0a33c1e | 901 | return 0; |
902 | } | |
903 | ||
586a3fe8 CB |
904 | define_cleanup_function(struct lxc_tty_info *, lxc_delete_tty); |
905 | ||
663014ee | 906 | int lxc_allocate_ttys(struct lxc_conf *conf) |
2187efd3 | 907 | { |
586a3fe8 | 908 | struct lxc_terminal_info *tty_new = NULL; |
fca23691 | 909 | int ret; |
586a3fe8 | 910 | call_cleaner(lxc_delete_tty) struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 CB |
911 | |
912 | /* no tty in the configuration */ | |
885766f5 | 913 | if (ttys->max == 0) |
2187efd3 CB |
914 | return 0; |
915 | ||
55022530 CB |
916 | tty_new = malloc(sizeof(struct lxc_terminal_info) * ttys->max); |
917 | if (!tty_new) | |
2187efd3 | 918 | return -ENOMEM; |
55022530 | 919 | ttys->tty = tty_new; |
2187efd3 | 920 | |
55022530 | 921 | for (size_t i = 0; i < ttys->max; i++) { |
0e4be3cf | 922 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 923 | |
386e6768 CB |
924 | tty->master = -EBADF; |
925 | tty->slave = -EBADF; | |
77a39805 CB |
926 | ret = openpty(&tty->master, &tty->slave, NULL, NULL, NULL); |
927 | if (ret < 0) { | |
885766f5 | 928 | ttys->max = i; |
55022530 | 929 | return log_error_errno(-ENOTTY, ENOTTY, "Failed to create tty %zu", i); |
2187efd3 CB |
930 | } |
931 | ||
77a39805 CB |
932 | ret = ttyname_r(tty->slave, tty->name, sizeof(tty->name)); |
933 | if (ret < 0) { | |
77a39805 | 934 | ttys->max = i; |
55022530 | 935 | return log_error_errno(-ENOTTY, ENOTTY, "Failed to retrieve name of tty %zu slave", i); |
77a39805 CB |
936 | } |
937 | ||
0fd73091 | 938 | DEBUG("Created tty \"%s\" with master fd %d and slave fd %d", |
2520facd | 939 | tty->name, tty->master, tty->slave); |
2187efd3 CB |
940 | |
941 | /* Prevent leaking the file descriptors to the container */ | |
615f24ff | 942 | ret = fd_cloexec(tty->master, true); |
2187efd3 | 943 | if (ret < 0) |
b78872c0 CB |
944 | SYSWARN("Failed to set FD_CLOEXEC flag on master fd %d of tty device \"%s\"", |
945 | tty->master, tty->name); | |
2187efd3 | 946 | |
615f24ff | 947 | ret = fd_cloexec(tty->slave, true); |
2187efd3 | 948 | if (ret < 0) |
b78872c0 CB |
949 | SYSWARN("Failed to set FD_CLOEXEC flag on slave fd %d of tty device \"%s\"", |
950 | tty->slave, tty->name); | |
2187efd3 | 951 | |
7581d645 | 952 | tty->busy = -1; |
2187efd3 CB |
953 | } |
954 | ||
885766f5 | 955 | INFO("Finished creating %zu tty devices", ttys->max); |
586a3fe8 | 956 | move_ptr(ttys); |
2187efd3 CB |
957 | return 0; |
958 | } | |
959 | ||
0e4be3cf | 960 | void lxc_delete_tty(struct lxc_tty_info *ttys) |
2187efd3 | 961 | { |
386e6768 CB |
962 | if (!ttys->tty) |
963 | return; | |
964 | ||
55022530 | 965 | for (int i = 0; i < ttys->max; i++) { |
0e4be3cf | 966 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
55022530 CB |
967 | close_prot_errno_disarm(tty->master); |
968 | close_prot_errno_disarm(tty->slave); | |
2187efd3 CB |
969 | } |
970 | ||
55022530 | 971 | free_disarm(ttys->tty); |
2187efd3 CB |
972 | } |
973 | ||
974 | static int lxc_send_ttys_to_parent(struct lxc_handler *handler) | |
975 | { | |
976 | int i; | |
0fd73091 | 977 | int ret = -1; |
2187efd3 | 978 | struct lxc_conf *conf = handler->conf; |
0e4be3cf | 979 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 | 980 | int sock = handler->data_sock[0]; |
2187efd3 | 981 | |
885766f5 | 982 | if (ttys->max == 0) |
2187efd3 CB |
983 | return 0; |
984 | ||
885766f5 | 985 | for (i = 0; i < ttys->max; i++) { |
2187efd3 | 986 | int ttyfds[2]; |
0e4be3cf | 987 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 988 | |
2520facd CB |
989 | ttyfds[0] = tty->master; |
990 | ttyfds[1] = tty->slave; | |
2187efd3 CB |
991 | |
992 | ret = lxc_abstract_unix_send_fds(sock, ttyfds, 2, NULL, 0); | |
993 | if (ret < 0) | |
994 | break; | |
995 | ||
55022530 CB |
996 | TRACE("Sent tty \"%s\" with master fd %d and slave fd %d to parent", |
997 | tty->name, tty->master, tty->slave); | |
2187efd3 CB |
998 | } |
999 | ||
1000 | if (ret < 0) | |
6d1400b5 | 1001 | SYSERROR("Failed to send %zu ttys to parent", ttys->max); |
2187efd3 | 1002 | else |
885766f5 | 1003 | TRACE("Sent %zu ttys to parent", ttys->max); |
2187efd3 CB |
1004 | |
1005 | return ret; | |
1006 | } | |
1007 | ||
1008 | static int lxc_create_ttys(struct lxc_handler *handler) | |
1009 | { | |
1010 | int ret = -1; | |
1011 | struct lxc_conf *conf = handler->conf; | |
1012 | ||
663014ee | 1013 | ret = lxc_allocate_ttys(conf); |
2187efd3 CB |
1014 | if (ret < 0) { |
1015 | ERROR("Failed to allocate ttys"); | |
1016 | goto on_error; | |
1017 | } | |
1018 | ||
1019 | ret = lxc_send_ttys_to_parent(handler); | |
1020 | if (ret < 0) { | |
1021 | ERROR("Failed to send ttys to parent"); | |
1022 | goto on_error; | |
1023 | } | |
1024 | ||
1025 | if (!conf->is_execute) { | |
1026 | ret = lxc_setup_ttys(conf); | |
1027 | if (ret < 0) { | |
1028 | ERROR("Failed to setup ttys"); | |
1029 | goto on_error; | |
1030 | } | |
1031 | } | |
1032 | ||
885766f5 CB |
1033 | if (conf->ttys.tty_names) { |
1034 | ret = setenv("container_ttys", conf->ttys.tty_names, 1); | |
2187efd3 | 1035 | if (ret < 0) |
885766f5 | 1036 | SYSERROR("Failed to set \"container_ttys=%s\"", conf->ttys.tty_names); |
2187efd3 CB |
1037 | } |
1038 | ||
1039 | ret = 0; | |
1040 | ||
1041 | on_error: | |
0e4be3cf | 1042 | lxc_delete_tty(&conf->ttys); |
2187efd3 CB |
1043 | |
1044 | return ret; | |
1045 | } | |
1046 | ||
7133b912 CB |
1047 | /* Just create a path for /dev under $lxcpath/$name and in rootfs If we hit an |
1048 | * error, log it but don't fail yet. | |
91c3830e | 1049 | */ |
7133b912 | 1050 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, |
63012bdd | 1051 | int autodevtmpfssize, const char *lxcpath) |
91c3830e | 1052 | { |
2f443e88 | 1053 | __do_free char *path = NULL; |
91c3830e | 1054 | int ret; |
87da4ec3 | 1055 | size_t clen; |
87e0e273 | 1056 | mode_t cur_mask; |
63012bdd | 1057 | char mount_options[128]; |
91c3830e | 1058 | |
7133b912 | 1059 | INFO("Preparing \"/dev\""); |
bc6928ff | 1060 | |
14221cbb | 1061 | /* $(rootfs->mount) + "/dev/pts" + '\0' */ |
ec50007f | 1062 | clen = (rootfs->path ? strlen(rootfs->mount) : 0) + 9; |
2f443e88 | 1063 | path = must_realloc(NULL, clen); |
63012bdd CK |
1064 | sprintf(mount_options, "size=%d,mode=755", (autodevtmpfssize != 0) ? autodevtmpfssize : 500000); |
1065 | DEBUG("Using mount options: %s", mount_options); | |
bc6928ff | 1066 | |
ec50007f | 1067 | ret = snprintf(path, clen, "%s/dev", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1068 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1069 | return -1; |
bc6928ff | 1070 | |
87e0e273 CB |
1071 | cur_mask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
1072 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
1073 | if (ret < 0 && errno != EEXIST) { | |
1074 | SYSERROR("Failed to create \"/dev\" directory"); | |
1075 | ret = -errno; | |
1076 | goto reset_umask; | |
bc6928ff | 1077 | } |
87da4ec3 | 1078 | |
63012bdd CK |
1079 | ret = safe_mount("none", path, "tmpfs", 0, mount_options, |
1080 | rootfs->path ? rootfs->mount : NULL ); | |
7133b912 CB |
1081 | if (ret < 0) { |
1082 | SYSERROR("Failed to mount tmpfs on \"%s\"", path); | |
87e0e273 | 1083 | goto reset_umask; |
91c3830e | 1084 | } |
87e0e273 | 1085 | TRACE("Mounted tmpfs on \"%s\"", path); |
87da4ec3 | 1086 | |
ec50007f | 1087 | ret = snprintf(path, clen, "%s/dev/pts", rootfs->path ? rootfs->mount : ""); |
87e0e273 CB |
1088 | if (ret < 0 || (size_t)ret >= clen) { |
1089 | ret = -1; | |
1090 | goto reset_umask; | |
1091 | } | |
87da4ec3 | 1092 | |
7133b912 | 1093 | /* If we are running on a devtmpfs mapping, dev/pts may already exist. |
bc6928ff MW |
1094 | * If not, then create it and exit if that fails... |
1095 | */ | |
87e0e273 CB |
1096 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
1097 | if (ret < 0 && errno != EEXIST) { | |
1098 | SYSERROR("Failed to create directory \"%s\"", path); | |
1099 | ret = -errno; | |
1100 | goto reset_umask; | |
91c3830e SH |
1101 | } |
1102 | ||
87e0e273 CB |
1103 | ret = 0; |
1104 | ||
1105 | reset_umask: | |
1106 | (void)umask(cur_mask); | |
1107 | ||
7133b912 | 1108 | INFO("Prepared \"/dev\""); |
87e0e273 | 1109 | return ret; |
91c3830e SH |
1110 | } |
1111 | ||
5e73416f | 1112 | struct lxc_device_node { |
74a3920a | 1113 | const char *name; |
5e73416f CB |
1114 | const mode_t mode; |
1115 | const int maj; | |
1116 | const int min; | |
c6883f38 SH |
1117 | }; |
1118 | ||
5e73416f | 1119 | static const struct lxc_device_node lxc_devices[] = { |
06749971 | 1120 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, |
5e73416f | 1121 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
06749971 CB |
1122 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, |
1123 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
5e73416f CB |
1124 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, |
1125 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
c6883f38 SH |
1126 | }; |
1127 | ||
5067e4dd CB |
1128 | |
1129 | enum { | |
1130 | LXC_DEVNODE_BIND, | |
1131 | LXC_DEVNODE_MKNOD, | |
1132 | LXC_DEVNODE_PARTIAL, | |
1133 | LXC_DEVNODE_OPEN, | |
1134 | }; | |
1135 | ||
27245ff7 | 1136 | static int lxc_fill_autodev(const struct lxc_rootfs *rootfs) |
c6883f38 | 1137 | { |
5e73416f | 1138 | int i, ret; |
6b5a54cd | 1139 | char path[PATH_MAX]; |
3a32201c | 1140 | mode_t cmask; |
5067e4dd | 1141 | int use_mknod = LXC_DEVNODE_MKNOD; |
c6883f38 | 1142 | |
6b5a54cd | 1143 | ret = snprintf(path, PATH_MAX, "%s/dev", |
3999be0a | 1144 | rootfs->path ? rootfs->mount : ""); |
6b5a54cd | 1145 | if (ret < 0 || ret >= PATH_MAX) |
c6883f38 | 1146 | return -1; |
91c3830e | 1147 | |
0bbf8572 CB |
1148 | /* ignore, just don't try to fill in */ |
1149 | if (!dir_exists(path)) | |
9cb4d183 SH |
1150 | return 0; |
1151 | ||
3999be0a CB |
1152 | INFO("Populating \"/dev\""); |
1153 | ||
3a32201c | 1154 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
5e73416f | 1155 | for (i = 0; i < sizeof(lxc_devices) / sizeof(lxc_devices[0]); i++) { |
6b5a54cd | 1156 | char hostpath[PATH_MAX]; |
5e73416f | 1157 | const struct lxc_device_node *device = &lxc_devices[i]; |
0728ebf4 | 1158 | |
6b5a54cd | 1159 | ret = snprintf(path, PATH_MAX, "%s/dev/%s", |
5e73416f | 1160 | rootfs->path ? rootfs->mount : "", device->name); |
6b5a54cd | 1161 | if (ret < 0 || ret >= PATH_MAX) |
c6883f38 | 1162 | return -1; |
0bbf8572 | 1163 | |
5067e4dd | 1164 | if (use_mknod >= LXC_DEVNODE_MKNOD) { |
5e73416f CB |
1165 | ret = mknod(path, device->mode, makedev(device->maj, device->min)); |
1166 | if (ret == 0 || (ret < 0 && errno == EEXIST)) { | |
1167 | DEBUG("Created device node \"%s\"", path); | |
5067e4dd | 1168 | } else if (ret < 0) { |
55022530 CB |
1169 | if (errno != EPERM) |
1170 | return log_error_errno(-1, errno, "Failed to create device node \"%s\"", path); | |
0bbf8572 | 1171 | |
5067e4dd | 1172 | use_mknod = LXC_DEVNODE_BIND; |
9cb4d183 | 1173 | } |
3999be0a | 1174 | |
5067e4dd CB |
1175 | /* Device nodes are fully useable. */ |
1176 | if (use_mknod == LXC_DEVNODE_OPEN) | |
1177 | continue; | |
1178 | ||
1179 | if (use_mknod == LXC_DEVNODE_MKNOD) { | |
1180 | /* See | |
1181 | * - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=55956b59df336f6738da916dbb520b6e37df9fbd | |
1182 | * - https://lists.linuxfoundation.org/pipermail/containers/2018-June/039176.html | |
1183 | */ | |
1184 | ret = open(path, O_RDONLY | O_CLOEXEC); | |
1185 | if (ret >= 0) { | |
ae2a3d81 | 1186 | close_prot_errno_disarm(ret); |
5067e4dd CB |
1187 | /* Device nodes are fully useable. */ |
1188 | use_mknod = LXC_DEVNODE_OPEN; | |
1189 | continue; | |
1190 | } | |
1191 | ||
1192 | SYSTRACE("Failed to open \"%s\" device", path); | |
1193 | /* Device nodes are only partially useable. */ | |
1194 | use_mknod = LXC_DEVNODE_PARTIAL; | |
1195 | } | |
5e73416f CB |
1196 | } |
1197 | ||
5067e4dd CB |
1198 | if (use_mknod != LXC_DEVNODE_PARTIAL) { |
1199 | /* If we are dealing with partially functional device | |
1200 | * nodes the prio mknod() call will have created the | |
1201 | * device node so we can use it as a bind-mount target. | |
1202 | */ | |
1203 | ret = mknod(path, S_IFREG | 0000, 0); | |
55022530 CB |
1204 | if (ret < 0 && errno != EEXIST) |
1205 | return log_error_errno(-1, errno, "Failed to create file \"%s\"", path); | |
5e73416f CB |
1206 | } |
1207 | ||
1208 | /* Fallback to bind-mounting the device from the host. */ | |
6b5a54cd CB |
1209 | ret = snprintf(hostpath, PATH_MAX, "/dev/%s", device->name); |
1210 | if (ret < 0 || ret >= PATH_MAX) | |
5e73416f CB |
1211 | return -1; |
1212 | ||
1213 | ret = safe_mount(hostpath, path, 0, MS_BIND, NULL, | |
1214 | rootfs->path ? rootfs->mount : NULL); | |
55022530 CB |
1215 | if (ret < 0) |
1216 | return log_error_errno(-1, errno, "Failed to bind mount host device node \"%s\" onto \"%s\"", | |
1217 | hostpath, path); | |
1218 | DEBUG("Bind mounted host device node \"%s\" onto \"%s\"", hostpath, path); | |
c6883f38 | 1219 | } |
5e73416f | 1220 | (void)umask(cmask); |
c6883f38 | 1221 | |
3999be0a | 1222 | INFO("Populated \"/dev\""); |
c6883f38 SH |
1223 | return 0; |
1224 | } | |
1225 | ||
8ce1abc2 | 1226 | static int lxc_mount_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1227 | { |
9aa76a17 | 1228 | int ret; |
10bc1861 | 1229 | struct lxc_storage *bdev; |
8ce1abc2 | 1230 | const struct lxc_rootfs *rootfs = &conf->rootfs; |
cc28d0b0 | 1231 | |
a0f379bf | 1232 | if (!rootfs->path) { |
0fd73091 | 1233 | ret = mount("", "/", NULL, MS_SLAVE | MS_REC, 0); |
55022530 CB |
1234 | if (ret < 0) |
1235 | return log_error_errno(-1, errno, "Failed to remount \"/\" MS_REC | MS_SLAVE"); | |
0fd73091 | 1236 | |
c69bd12f | 1237 | return 0; |
a0f379bf | 1238 | } |
0ad19a3f | 1239 | |
0fd73091 | 1240 | ret = access(rootfs->mount, F_OK); |
55022530 CB |
1241 | if (ret != 0) |
1242 | return log_error_errno(-1, errno, "Failed to access to \"%s\". Check it is present", | |
1243 | rootfs->mount); | |
b1789442 | 1244 | |
8a388ed4 | 1245 | bdev = storage_init(conf); |
55022530 CB |
1246 | if (!bdev) |
1247 | return log_error(-1, "Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", | |
1248 | rootfs->path, rootfs->mount, | |
1249 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 CB |
1250 | |
1251 | ret = bdev->ops->mount(bdev); | |
10bc1861 | 1252 | storage_put(bdev); |
55022530 CB |
1253 | if (ret < 0) |
1254 | return log_error(-1, "Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", | |
1255 | rootfs->path, rootfs->mount, | |
1256 | rootfs->options ? rootfs->options : "(null)"); | |
0ad19a3f | 1257 | |
0fd73091 | 1258 | DEBUG("Mounted rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1259 | rootfs->path, rootfs->mount, |
1260 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1261 | |
ac778708 DL |
1262 | return 0; |
1263 | } | |
1264 | ||
8ce1abc2 | 1265 | int lxc_chroot(const struct lxc_rootfs *rootfs) |
91e93c71 | 1266 | { |
b8d88764 | 1267 | __do_free char *nroot = NULL; |
0fd73091 | 1268 | int i, ret; |
8ce1abc2 | 1269 | char *root = rootfs->mount; |
91e93c71 | 1270 | |
74e7b662 | 1271 | nroot = realpath(root, NULL); |
55022530 CB |
1272 | if (!nroot) |
1273 | return log_error_errno(-1, errno, "Failed to resolve \"%s\"", root); | |
91e93c71 | 1274 | |
0fd73091 | 1275 | ret = chdir("/"); |
b8d88764 | 1276 | if (ret < 0) |
0fd73091 | 1277 | return -1; |
91e93c71 | 1278 | |
0fd73091 CB |
1279 | /* We could use here MS_MOVE, but in userns this mount is locked and |
1280 | * can't be moved. | |
91e93c71 | 1281 | */ |
8ce1abc2 | 1282 | ret = mount(nroot, "/", NULL, MS_REC | MS_BIND, NULL); |
55022530 CB |
1283 | if (ret < 0) |
1284 | return log_error_errno(-1, errno, "Failed to mount \"%s\" onto \"/\" as MS_REC | MS_BIND", nroot); | |
91e93c71 | 1285 | |
0fd73091 | 1286 | ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL); |
55022530 CB |
1287 | if (ret < 0) |
1288 | return log_error_errno(-1, errno, "Failed to remount \"/\""); | |
91e93c71 | 1289 | |
aa899945 | 1290 | /* The following code cleans up inherited mounts which are not required |
0fd73091 | 1291 | * for CT. |
91e93c71 AV |
1292 | * |
1293 | * The mountinfo file shows not all mounts, if a few points have been | |
1294 | * unmounted between read operations from the mountinfo. So we need to | |
1295 | * read mountinfo a few times. | |
1296 | * | |
7ded5fa7 | 1297 | * This loop can be skipped if a container uses userns, because all |
91e93c71 AV |
1298 | * inherited mounts are locked and we should live with all this trash. |
1299 | */ | |
0fd73091 | 1300 | for (;;) { |
4fdd1f72 | 1301 | __do_fclose FILE *f = NULL; |
f3d38164 CB |
1302 | __do_free char *line = NULL; |
1303 | char *slider1, *slider2; | |
91e93c71 | 1304 | int progress = 0; |
f3d38164 | 1305 | size_t len = 0; |
91e93c71 | 1306 | |
4110345b | 1307 | f = fopen("./proc/self/mountinfo", "re"); |
55022530 CB |
1308 | if (!f) |
1309 | return log_error_errno(-1, errno, "Failed to open \"/proc/self/mountinfo\""); | |
0fd73091 | 1310 | |
f3d38164 CB |
1311 | while (getline(&line, &len, f) > 0) { |
1312 | for (slider1 = line, i = 0; slider1 && i < 4; i++) | |
1313 | slider1 = strchr(slider1 + 1, ' '); | |
0fd73091 | 1314 | |
f3d38164 | 1315 | if (!slider1) |
91e93c71 | 1316 | continue; |
0fd73091 | 1317 | |
f3d38164 CB |
1318 | slider2 = strchr(slider1 + 1, ' '); |
1319 | if (!slider2) | |
91e93c71 AV |
1320 | continue; |
1321 | ||
f3d38164 CB |
1322 | *slider2 = '\0'; |
1323 | *slider1 = '.'; | |
91e93c71 | 1324 | |
f3d38164 | 1325 | if (strcmp(slider1 + 1, "/") == 0) |
91e93c71 | 1326 | continue; |
0fd73091 | 1327 | |
f3d38164 | 1328 | if (strcmp(slider1 + 1, "/proc") == 0) |
91e93c71 AV |
1329 | continue; |
1330 | ||
f3d38164 | 1331 | ret = umount2(slider1, MNT_DETACH); |
0fd73091 | 1332 | if (ret == 0) |
91e93c71 AV |
1333 | progress++; |
1334 | } | |
0fd73091 | 1335 | |
91e93c71 AV |
1336 | if (!progress) |
1337 | break; | |
1338 | } | |
1339 | ||
7ded5fa7 | 1340 | /* This also can be skipped if a container uses userns. */ |
0fd73091 | 1341 | (void)umount2("./proc", MNT_DETACH); |
91e93c71 AV |
1342 | |
1343 | /* It is weird, but chdir("..") moves us in a new root */ | |
0fd73091 | 1344 | ret = chdir(".."); |
55022530 CB |
1345 | if (ret < 0) |
1346 | return log_error_errno(-1, errno, "Failed to chdir(\"..\")"); | |
91e93c71 | 1347 | |
0fd73091 | 1348 | ret = chroot("."); |
55022530 CB |
1349 | if (ret < 0) |
1350 | return log_error_errno(-1, errno, "Failed to chroot(\".\")"); | |
91e93c71 AV |
1351 | |
1352 | return 0; | |
1353 | } | |
1354 | ||
8ce1abc2 CB |
1355 | /* (The following explanation is copied verbatim from the kernel.) |
1356 | * | |
1357 | * pivot_root Semantics: | |
1358 | * Moves the root file system of the current process to the directory put_old, | |
1359 | * makes new_root as the new root file system of the current process, and sets | |
1360 | * root/cwd of all processes which had them on the current root to new_root. | |
1361 | * | |
1362 | * Restrictions: | |
1363 | * The new_root and put_old must be directories, and must not be on the | |
1364 | * same file system as the current process root. The put_old must be | |
1365 | * underneath new_root, i.e. adding a non-zero number of /.. to the string | |
1366 | * pointed to by put_old must yield the same directory as new_root. No other | |
1367 | * file system may be mounted on put_old. After all, new_root is a mountpoint. | |
1368 | * | |
1369 | * Also, the current root cannot be on the 'rootfs' (initial ramfs) filesystem. | |
1370 | * See Documentation/filesystems/ramfs-rootfs-initramfs.txt for alternatives | |
1371 | * in this situation. | |
1372 | * | |
1373 | * Notes: | |
1374 | * - we don't move root/cwd if they are not at the root (reason: if something | |
1375 | * cared enough to change them, it's probably wrong to force them elsewhere) | |
1376 | * - it's okay to pick a root that isn't the root of a file system, e.g. | |
1377 | * /nfs/my_root where /nfs is the mount point. It must be a mountpoint, | |
1378 | * though, so you may need to say mount --bind /nfs/my_root /nfs/my_root | |
1379 | * first. | |
1380 | */ | |
1381 | static int lxc_pivot_root(const char *rootfs) | |
ac778708 | 1382 | { |
f62cf1d4 | 1383 | __do_close int oldroot = -EBADF, newroot = -EBADF; |
b0d7aac4 | 1384 | int ret; |
0fd73091 | 1385 | |
7806ebd7 | 1386 | oldroot = open("/", O_DIRECTORY | O_RDONLY | O_CLOEXEC); |
55022530 CB |
1387 | if (oldroot < 0) |
1388 | return log_error_errno(-1, errno, "Failed to open old root directory"); | |
ac778708 | 1389 | |
7806ebd7 | 1390 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY | O_CLOEXEC); |
55022530 CB |
1391 | if (newroot < 0) |
1392 | return log_error_errno(-1, errno, "Failed to open new root directory"); | |
0fd73091 | 1393 | |
8ce1abc2 CB |
1394 | /* change into new root fs */ |
1395 | ret = fchdir(newroot); | |
55022530 CB |
1396 | if (ret < 0) |
1397 | return log_error_errno(-1, errno, "Failed to change to new rootfs \"%s\"", rootfs); | |
39c7b795 | 1398 | |
8ce1abc2 CB |
1399 | /* pivot_root into our new root fs */ |
1400 | ret = pivot_root(".", "."); | |
55022530 CB |
1401 | if (ret < 0) |
1402 | return log_error_errno(-1, errno, "Failed to pivot_root()"); | |
39c7b795 | 1403 | |
8ce1abc2 CB |
1404 | /* At this point the old-root is mounted on top of our new-root. To |
1405 | * unmounted it we must not be chdir'd into it, so escape back to | |
1406 | * old-root. | |
1407 | */ | |
1408 | ret = fchdir(oldroot); | |
55022530 CB |
1409 | if (ret < 0) |
1410 | return log_error_errno(-1, errno, "Failed to enter old root directory"); | |
c69bd12f | 1411 | |
8ce1abc2 CB |
1412 | /* Make oldroot rslave to make sure our umounts don't propagate to the |
1413 | * host. | |
1414 | */ | |
1415 | ret = mount("", ".", "", MS_SLAVE | MS_REC, NULL); | |
55022530 CB |
1416 | if (ret < 0) |
1417 | return log_error_errno(-1, errno, "Failed to make oldroot rslave"); | |
8ce1abc2 CB |
1418 | |
1419 | ret = umount2(".", MNT_DETACH); | |
55022530 CB |
1420 | if (ret < 0) |
1421 | return log_error_errno(-1, errno, "Failed to detach old root directory"); | |
8ce1abc2 CB |
1422 | |
1423 | ret = fchdir(newroot); | |
55022530 CB |
1424 | if (ret < 0) |
1425 | return log_error_errno(-1, errno, "Failed to re-enter new root directory"); | |
8ce1abc2 | 1426 | |
8ce1abc2 CB |
1427 | TRACE("pivot_root(\"%s\") successful", rootfs); |
1428 | ||
b0d7aac4 | 1429 | return 0; |
0ad19a3f | 1430 | } |
1431 | ||
8ce1abc2 CB |
1432 | static int lxc_setup_rootfs_switch_root(const struct lxc_rootfs *rootfs) |
1433 | { | |
55022530 CB |
1434 | if (!rootfs->path) |
1435 | return log_debug(0, "Container does not have a rootfs"); | |
8ce1abc2 CB |
1436 | |
1437 | if (detect_ramfs_rootfs()) | |
1438 | return lxc_chroot(rootfs); | |
1439 | ||
1440 | return lxc_pivot_root(rootfs->mount); | |
0ad19a3f | 1441 | } |
1442 | ||
7581a82f | 1443 | static const struct id_map *find_mapped_nsid_entry(const struct lxc_conf *conf, |
8ce1abc2 CB |
1444 | unsigned id, |
1445 | enum idtype idtype) | |
f4900711 CB |
1446 | { |
1447 | struct lxc_list *it; | |
1448 | struct id_map *map; | |
1449 | struct id_map *retmap = NULL; | |
1450 | ||
dcf0ffdf CB |
1451 | /* Shortcut for container's root mappings. */ |
1452 | if (id == 0) { | |
1453 | if (idtype == ID_TYPE_UID) | |
1454 | return conf->root_nsuid_map; | |
1455 | ||
1456 | if (idtype == ID_TYPE_GID) | |
1457 | return conf->root_nsgid_map; | |
1458 | } | |
1459 | ||
f4900711 CB |
1460 | lxc_list_for_each(it, &conf->id_map) { |
1461 | map = it->elem; | |
1462 | if (map->idtype != idtype) | |
1463 | continue; | |
1464 | ||
1465 | if (id >= map->nsid && id < map->nsid + map->range) { | |
1466 | retmap = map; | |
1467 | break; | |
1468 | } | |
1469 | } | |
1470 | ||
1471 | return retmap; | |
1472 | } | |
1473 | ||
1474 | static int lxc_setup_devpts(struct lxc_conf *conf) | |
3c26f34e | 1475 | { |
70761e5e | 1476 | int ret; |
ce155c60 | 1477 | char **opts; |
9d28c4f9 | 1478 | char devpts_mntopts[256]; |
ce155c60 CB |
1479 | char *mntopt_sets[5]; |
1480 | char default_devpts_mntopts[256] = "gid=5,newinstance,ptmxmode=0666,mode=0620"; | |
77890c6d | 1481 | |
55022530 CB |
1482 | if (conf->pty_max <= 0) |
1483 | return log_debug(0, "No new devpts instance will be mounted since no pts devices are requested"); | |
3c26f34e | 1484 | |
e528c735 CB |
1485 | ret = snprintf(devpts_mntopts, sizeof(devpts_mntopts), "%s,max=%zu", |
1486 | default_devpts_mntopts, conf->pty_max); | |
9d28c4f9 CB |
1487 | if (ret < 0 || (size_t)ret >= sizeof(devpts_mntopts)) |
1488 | return -1; | |
1489 | ||
29a7b484 | 1490 | (void)umount2("/dev/pts", MNT_DETACH); |
7e40254a | 1491 | |
70761e5e CB |
1492 | /* Create mountpoint for devpts instance. */ |
1493 | ret = mkdir("/dev/pts", 0755); | |
55022530 CB |
1494 | if (ret < 0 && errno != EEXIST) |
1495 | return log_error_errno(-1, errno, "Failed to create \"/dev/pts\" directory"); | |
3c26f34e | 1496 | |
ce155c60 CB |
1497 | /* gid=5 && max= */ |
1498 | mntopt_sets[0] = devpts_mntopts; | |
dfbd4730 | 1499 | |
ce155c60 | 1500 | /* !gid=5 && max= */ |
6333c915 | 1501 | mntopt_sets[1] = devpts_mntopts + STRLITERALLEN("gid=5") + 1; |
ce155c60 CB |
1502 | |
1503 | /* gid=5 && !max= */ | |
1504 | mntopt_sets[2] = default_devpts_mntopts; | |
1505 | ||
1506 | /* !gid=5 && !max= */ | |
6333c915 | 1507 | mntopt_sets[3] = default_devpts_mntopts + STRLITERALLEN("gid=5") + 1; |
ce155c60 CB |
1508 | |
1509 | /* end */ | |
1510 | mntopt_sets[4] = NULL; | |
1511 | ||
1512 | for (ret = -1, opts = mntopt_sets; opts && *opts; opts++) { | |
1513 | /* mount new devpts instance */ | |
1514 | ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, *opts); | |
1515 | if (ret == 0) | |
1516 | break; | |
1517 | } | |
1518 | ||
55022530 CB |
1519 | if (ret < 0) |
1520 | return log_error_errno(-1, errno, "Failed to mount new devpts instance"); | |
ce155c60 | 1521 | DEBUG("Mount new devpts instance with options \"%s\"", *opts); |
70761e5e | 1522 | |
d5cb35d6 | 1523 | /* Remove any pre-existing /dev/ptmx file. */ |
b29e05d6 CB |
1524 | ret = remove("/dev/ptmx"); |
1525 | if (ret < 0) { | |
55022530 CB |
1526 | if (errno != ENOENT) |
1527 | return log_error_errno(-1, errno, "Failed to remove existing \"/dev/ptmx\" file"); | |
b29e05d6 | 1528 | } else { |
0fd73091 | 1529 | DEBUG("Removed existing \"/dev/ptmx\" file"); |
3c26f34e | 1530 | } |
1531 | ||
d5cb35d6 | 1532 | /* Create dummy /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
3b7e332f | 1533 | ret = mknod("/dev/ptmx", S_IFREG | 0000, 0); |
55022530 CB |
1534 | if (ret < 0 && errno != EEXIST) |
1535 | return log_error_errno(-1, errno, "Failed to create dummy \"/dev/ptmx\" file as bind mount target"); | |
0fd73091 | 1536 | DEBUG("Created dummy \"/dev/ptmx\" file as bind mount target"); |
77890c6d | 1537 | |
d5cb35d6 | 1538 | /* Fallback option: create symlink /dev/ptmx -> /dev/pts/ptmx */ |
e87bd19c | 1539 | ret = mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL); |
55022530 CB |
1540 | if (!ret) |
1541 | return log_debug(0, "Bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); | |
1542 | else | |
d5cb35d6 | 1543 | /* Fallthrough and try to create a symlink. */ |
0fd73091 | 1544 | ERROR("Failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1545 | |
1546 | /* Remove the dummy /dev/ptmx file we created above. */ | |
1547 | ret = remove("/dev/ptmx"); | |
55022530 CB |
1548 | if (ret < 0) |
1549 | return log_error_errno(-1, errno, "Failed to remove existing \"/dev/ptmx\""); | |
d5cb35d6 CB |
1550 | |
1551 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
1552 | ret = symlink("/dev/pts/ptmx", "/dev/ptmx"); | |
55022530 CB |
1553 | if (ret < 0) |
1554 | return log_error_errno(-1, errno, "Failed to create symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); | |
0fd73091 | 1555 | DEBUG("Created symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
cd54d859 | 1556 | |
3c26f34e | 1557 | return 0; |
1558 | } | |
1559 | ||
cccc74b5 DL |
1560 | static int setup_personality(int persona) |
1561 | { | |
0fd73091 CB |
1562 | int ret; |
1563 | ||
1564 | #if HAVE_SYS_PERSONALITY_H | |
cccc74b5 DL |
1565 | if (persona == -1) |
1566 | return 0; | |
1567 | ||
0fd73091 | 1568 | ret = personality(persona); |
55022530 CB |
1569 | if (ret < 0) |
1570 | return log_error_errno(-1, errno, "Failed to set personality to \"0x%x\"", persona); | |
cccc74b5 | 1571 | |
0fd73091 CB |
1572 | INFO("Set personality to \"0x%x\"", persona); |
1573 | #endif | |
cccc74b5 DL |
1574 | |
1575 | return 0; | |
1576 | } | |
1577 | ||
3d7d929a | 1578 | static int lxc_setup_dev_console(const struct lxc_rootfs *rootfs, |
cf68ffd9 CB |
1579 | const struct lxc_terminal *console, |
1580 | int pts_mnt_fd) | |
6e590161 | 1581 | { |
882671aa | 1582 | int ret; |
6b5a54cd | 1583 | char path[PATH_MAX]; |
86530b0a | 1584 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
52e35957 | 1585 | |
8b1b1210 CB |
1586 | if (console->path && !strcmp(console->path, "none")) |
1587 | return 0; | |
1588 | ||
86530b0a | 1589 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3d7d929a | 1590 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1591 | return -1; |
52e35957 | 1592 | |
cf68ffd9 CB |
1593 | /* |
1594 | * When we are asked to setup a console we remove any previous | |
8b1b1210 CB |
1595 | * /dev/console bind-mounts. |
1596 | */ | |
a7ba3c7f CB |
1597 | if (file_exists(path)) { |
1598 | ret = lxc_unstack_mountpoint(path, false); | |
55022530 CB |
1599 | if (ret < 0) |
1600 | return log_error_errno(-ret, errno, "Failed to unmount \"%s\"", path); | |
1601 | else | |
86530b0a | 1602 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
8b1b1210 CB |
1603 | } |
1604 | ||
cf68ffd9 CB |
1605 | /* |
1606 | * For unprivileged containers autodev or automounts will already have | |
8b1b1210 CB |
1607 | * taken care of creating /dev/console. |
1608 | */ | |
882671aa | 1609 | ret = mknod(path, S_IFREG | 0000, 0); |
55022530 CB |
1610 | if (ret < 0 && errno != EEXIST) |
1611 | return log_error_errno(-errno, errno, "Failed to create console"); | |
52e35957 | 1612 | |
e581b9b5 | 1613 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP); |
55022530 CB |
1614 | if (ret < 0) |
1615 | return log_error_errno(-errno, errno, "Failed to set mode \"0%o\" to \"%s\"", S_IXUSR | S_IXGRP, console->name); | |
13954cce | 1616 | |
cf68ffd9 CB |
1617 | if (pts_mnt_fd >= 0) |
1618 | ret = move_mount(pts_mnt_fd, "", -EBADF, path, MOVE_MOUNT_F_EMPTY_PATH); | |
1619 | else | |
1620 | ret = safe_mount(console->name, path, "none", MS_BIND, 0, rootfs_path); | |
55022530 | 1621 | if (ret < 0) |
cf68ffd9 | 1622 | return log_error_errno(-1, errno, "Failed to mount %d(%s) on \"%s\"", pts_mnt_fd, console->name, path); |
6e590161 | 1623 | |
cf68ffd9 | 1624 | DEBUG("Mounted pts device %d(%s) onto \"%s\"", pts_mnt_fd, console->name, path); |
7c6ef2a2 SH |
1625 | return 0; |
1626 | } | |
1627 | ||
3d7d929a | 1628 | static int lxc_setup_ttydir_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1629 | const struct lxc_terminal *console, |
cf68ffd9 | 1630 | char *ttydir, int pts_mnt_fd) |
7c6ef2a2 | 1631 | { |
3b7e332f | 1632 | int ret; |
6b5a54cd | 1633 | char path[PATH_MAX], lxcpath[PATH_MAX]; |
86530b0a | 1634 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
7c6ef2a2 | 1635 | |
3dc035f1 L |
1636 | if (console->path && !strcmp(console->path, "none")) |
1637 | return 0; | |
1638 | ||
7c6ef2a2 | 1639 | /* create rootfs/dev/<ttydir> directory */ |
86530b0a | 1640 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs_path, ttydir); |
3d7d929a | 1641 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1642 | return -1; |
3d7d929a | 1643 | |
7c6ef2a2 | 1644 | ret = mkdir(path, 0755); |
55022530 CB |
1645 | if (ret && errno != EEXIST) |
1646 | return log_error_errno(-errno, errno, "Failed to create \"%s\"", path); | |
4742cd9a | 1647 | DEBUG("Created directory for console and tty devices at \"%s\"", path); |
7c6ef2a2 | 1648 | |
86530b0a | 1649 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", rootfs_path, ttydir); |
3d7d929a CB |
1650 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
1651 | return -1; | |
1652 | ||
3b7e332f | 1653 | ret = mknod(lxcpath, S_IFREG | 0000, 0); |
55022530 CB |
1654 | if (ret < 0 && errno != EEXIST) |
1655 | return log_error_errno(-errno, errno, "Failed to create \"%s\"", lxcpath); | |
7c6ef2a2 | 1656 | |
86530b0a | 1657 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3dc035f1 | 1658 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1659 | return -1; |
2a12fefd | 1660 | |
3dc035f1 | 1661 | if (file_exists(path)) { |
a7ba3c7f | 1662 | ret = lxc_unstack_mountpoint(path, false); |
55022530 CB |
1663 | if (ret < 0) |
1664 | return log_error_errno(-ret, errno, "Failed to unmount \"%s\"", path); | |
1665 | else | |
86530b0a | 1666 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
3dc035f1 | 1667 | } |
2a12fefd | 1668 | |
3b7e332f | 1669 | ret = mknod(path, S_IFREG | 0000, 0); |
55022530 CB |
1670 | if (ret < 0 && errno != EEXIST) |
1671 | return log_error_errno(-errno, errno, "Failed to create console"); | |
7c6ef2a2 | 1672 | |
e581b9b5 | 1673 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP); |
55022530 CB |
1674 | if (ret < 0) |
1675 | return log_error_errno(-errno, errno, "Failed to set mode \"0%o\" to \"%s\"", S_IXUSR | S_IXGRP, console->name); | |
2a12fefd | 1676 | |
3dc035f1 | 1677 | /* bind mount console->name to '/dev/<ttydir>/console' */ |
cf68ffd9 CB |
1678 | if (pts_mnt_fd >= 0) |
1679 | ret = move_mount(pts_mnt_fd, "", -EBADF, path, MOVE_MOUNT_F_EMPTY_PATH); | |
1680 | else | |
1681 | ret = safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs_path); | |
55022530 | 1682 | if (ret < 0) |
cf68ffd9 | 1683 | return log_error_errno(-1, errno, "Failed to mount %d(%s) on \"%s\"", pts_mnt_fd, console->name, lxcpath); |
86530b0a | 1684 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1685 | |
1686 | /* bind mount '/dev/<ttydir>/console' to '/dev/console' */ | |
86530b0a | 1687 | ret = safe_mount(lxcpath, path, "none", MS_BIND, 0, rootfs_path); |
55022530 CB |
1688 | if (ret < 0) |
1689 | return log_error_errno(-1, errno, "Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); | |
86530b0a | 1690 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 | 1691 | |
86530b0a | 1692 | DEBUG("Console has been setup under \"%s\" and mounted to \"%s\"", lxcpath, path); |
6e590161 | 1693 | return 0; |
1694 | } | |
1695 | ||
3d7d929a | 1696 | static int lxc_setup_console(const struct lxc_rootfs *rootfs, |
cf68ffd9 CB |
1697 | const struct lxc_terminal *console, char *ttydir, |
1698 | int pts_mnt_fd) | |
7c6ef2a2 | 1699 | { |
3d7d929a | 1700 | |
7c6ef2a2 | 1701 | if (!ttydir) |
cf68ffd9 | 1702 | return lxc_setup_dev_console(rootfs, console, pts_mnt_fd); |
7c6ef2a2 | 1703 | |
cf68ffd9 | 1704 | return lxc_setup_ttydir_console(rootfs, console, ttydir, pts_mnt_fd); |
7c6ef2a2 SH |
1705 | } |
1706 | ||
a08bfbe3 | 1707 | static int parse_mntopt(char *opt, unsigned long *flags, char **data, size_t size) |
998ac676 | 1708 | { |
a08bfbe3 | 1709 | ssize_t ret; |
998ac676 | 1710 | |
85c2de39 MB |
1711 | /* If '=' is contained in opt, the option must go into data. */ |
1712 | if (!strchr(opt, '=')) { | |
a08bfbe3 CB |
1713 | /* |
1714 | * If opt is found in mount_opt, set or clear flags. | |
1715 | * Otherwise append it to data. | |
1716 | */ | |
85c2de39 | 1717 | size_t opt_len = strlen(opt); |
a08bfbe3 | 1718 | for (struct mount_opt *mo = &mount_opt[0]; mo->name != NULL; mo++) { |
85c2de39 | 1719 | size_t mo_name_len = strlen(mo->name); |
a08bfbe3 | 1720 | |
85c2de39 MB |
1721 | if (opt_len == mo_name_len && strncmp(opt, mo->name, mo_name_len) == 0) { |
1722 | if (mo->clear) | |
1723 | *flags &= ~mo->flag; | |
1724 | else | |
1725 | *flags |= mo->flag; | |
a08bfbe3 | 1726 | return 0; |
85c2de39 | 1727 | } |
998ac676 RT |
1728 | } |
1729 | } | |
1730 | ||
a08bfbe3 CB |
1731 | if (strlen(*data)) { |
1732 | ret = strlcat(*data, ",", size); | |
1733 | if (ret < 0) | |
1734 | return log_error_errno(ret, errno, "Failed to append \",\" to %s", *data); | |
1735 | } | |
1736 | ||
1737 | ret = strlcat(*data, opt, size); | |
1738 | if (ret < 0) | |
1739 | return log_error_errno(ret, errno, "Failed to append \"%s\" to %s", opt, *data); | |
efed99a4 | 1740 | |
a08bfbe3 | 1741 | return 0; |
998ac676 RT |
1742 | } |
1743 | ||
0fd73091 | 1744 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, char **mntdata) |
998ac676 | 1745 | { |
a08bfbe3 CB |
1746 | __do_free char *mntopts_new = NULL, *mntopts_dup = NULL; |
1747 | char *mntopt_cur = NULL; | |
efed99a4 | 1748 | size_t size; |
998ac676 | 1749 | |
a08bfbe3 CB |
1750 | if (*mntdata || *mntflags) |
1751 | return ret_errno(EINVAL); | |
911324ef DL |
1752 | |
1753 | if (!mntopts) | |
998ac676 RT |
1754 | return 0; |
1755 | ||
a08bfbe3 CB |
1756 | mntopts_dup = strdup(mntopts); |
1757 | if (!mntopts_dup) | |
1758 | return ret_errno(ENOMEM); | |
998ac676 | 1759 | |
a08bfbe3 CB |
1760 | size = strlen(mntopts_dup) + 1; |
1761 | mntopts_new = zalloc(size); | |
1762 | if (!mntopts_new) | |
1763 | return ret_errno(ENOMEM); | |
998ac676 | 1764 | |
a08bfbe3 CB |
1765 | lxc_iterate_parts(mntopt_cur, mntopts_dup, ",") |
1766 | if (parse_mntopt(mntopt_cur, mntflags, &mntopts_new, size) < 0) | |
1767 | return ret_errno(EINVAL); | |
998ac676 | 1768 | |
a08bfbe3 CB |
1769 | if (*mntopts_new) |
1770 | *mntdata = move_ptr(mntopts_new); | |
998ac676 RT |
1771 | |
1772 | return 0; | |
1773 | } | |
1774 | ||
d840039e YT |
1775 | static void parse_propagationopt(char *opt, unsigned long *flags) |
1776 | { | |
1777 | struct mount_opt *mo; | |
1778 | ||
1779 | /* If opt is found in propagation_opt, set or clear flags. */ | |
d840039e | 1780 | for (mo = &propagation_opt[0]; mo->name != NULL; mo++) { |
0fd73091 CB |
1781 | if (strncmp(opt, mo->name, strlen(mo->name)) != 0) |
1782 | continue; | |
1783 | ||
1784 | if (mo->clear) | |
1785 | *flags &= ~mo->flag; | |
1786 | else | |
1787 | *flags |= mo->flag; | |
1788 | ||
1789 | return; | |
d840039e YT |
1790 | } |
1791 | } | |
1792 | ||
8ce1abc2 | 1793 | int parse_propagationopts(const char *mntopts, unsigned long *pflags) |
d840039e | 1794 | { |
dfd2e059 CB |
1795 | __do_free char *s = NULL; |
1796 | char *p; | |
d840039e YT |
1797 | |
1798 | if (!mntopts) | |
1799 | return 0; | |
1800 | ||
1801 | s = strdup(mntopts); | |
55022530 CB |
1802 | if (!s) |
1803 | return log_error_errno(-ENOMEM, errno, "Failed to allocate memory"); | |
d840039e | 1804 | |
0fd73091 | 1805 | *pflags = 0L; |
8db9d26f | 1806 | lxc_iterate_parts(p, s, ",") |
d840039e | 1807 | parse_propagationopt(p, pflags); |
0fd73091 | 1808 | |
d840039e YT |
1809 | return 0; |
1810 | } | |
1811 | ||
6fd5e769 SH |
1812 | static void null_endofword(char *word) |
1813 | { | |
1814 | while (*word && *word != ' ' && *word != '\t') | |
1815 | word++; | |
1816 | *word = '\0'; | |
1817 | } | |
1818 | ||
0fd73091 | 1819 | /* skip @nfields spaces in @src */ |
6fd5e769 SH |
1820 | static char *get_field(char *src, int nfields) |
1821 | { | |
6fd5e769 | 1822 | int i; |
0fd73091 | 1823 | char *p = src; |
6fd5e769 SH |
1824 | |
1825 | for (i = 0; i < nfields; i++) { | |
1826 | while (*p && *p != ' ' && *p != '\t') | |
1827 | p++; | |
0fd73091 | 1828 | |
6fd5e769 SH |
1829 | if (!*p) |
1830 | break; | |
0fd73091 | 1831 | |
6fd5e769 SH |
1832 | p++; |
1833 | } | |
0fd73091 | 1834 | |
6fd5e769 SH |
1835 | return p; |
1836 | } | |
1837 | ||
911324ef DL |
1838 | static int mount_entry(const char *fsname, const char *target, |
1839 | const char *fstype, unsigned long mountflags, | |
d840039e YT |
1840 | unsigned long pflags, const char *data, bool optional, |
1841 | bool dev, bool relative, const char *rootfs) | |
911324ef | 1842 | { |
0ac4b28a | 1843 | int ret; |
6b5a54cd | 1844 | char srcbuf[PATH_MAX]; |
181437fd | 1845 | const char *srcpath = fsname; |
614305f3 | 1846 | #ifdef HAVE_STATVFS |
2938f7c8 | 1847 | struct statvfs sb; |
614305f3 | 1848 | #endif |
2938f7c8 | 1849 | |
181437fd | 1850 | if (relative) { |
55022530 CB |
1851 | ret = snprintf(srcbuf, sizeof(srcbuf), "%s/%s", rootfs ? rootfs : "/", fsname ? fsname : ""); |
1852 | if (ret < 0 || ret >= sizeof(srcbuf)) | |
1853 | return log_error_errno(-1, errno, "source path is too long"); | |
181437fd YT |
1854 | srcpath = srcbuf; |
1855 | } | |
1856 | ||
1857 | ret = safe_mount(srcpath, target, fstype, mountflags & ~MS_REMOUNT, data, | |
0ac4b28a CB |
1858 | rootfs); |
1859 | if (ret < 0) { | |
55022530 CB |
1860 | if (optional) |
1861 | return log_info_errno(0, errno, "Failed to mount \"%s\" on \"%s\" (optional)", | |
1862 | srcpath ? srcpath : "(null)", target); | |
0ac4b28a | 1863 | |
55022530 CB |
1864 | return log_error_errno(-1, errno, "Failed to mount \"%s\" on \"%s\"", |
1865 | srcpath ? srcpath : "(null)", target); | |
911324ef DL |
1866 | } |
1867 | ||
1868 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
0ac4b28a | 1869 | |
55022530 CB |
1870 | DEBUG("Remounting \"%s\" on \"%s\" to respect bind or remount options", |
1871 | srcpath ? srcpath : "(none)", target ? target : "(none)"); | |
0ac4b28a | 1872 | |
614305f3 | 1873 | #ifdef HAVE_STATVFS |
181437fd | 1874 | if (srcpath && statvfs(srcpath, &sb) == 0) { |
94bef7e4 TA |
1875 | unsigned long required_flags = 0; |
1876 | ||
2938f7c8 SH |
1877 | if (sb.f_flag & MS_NOSUID) |
1878 | required_flags |= MS_NOSUID; | |
0ac4b28a | 1879 | |
ae7a770e | 1880 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 | 1881 | required_flags |= MS_NODEV; |
0ac4b28a | 1882 | |
2938f7c8 SH |
1883 | if (sb.f_flag & MS_RDONLY) |
1884 | required_flags |= MS_RDONLY; | |
0ac4b28a | 1885 | |
2938f7c8 SH |
1886 | if (sb.f_flag & MS_NOEXEC) |
1887 | required_flags |= MS_NOEXEC; | |
0ac4b28a | 1888 | |
55022530 CB |
1889 | DEBUG("Flags for \"%s\" were %lu, required extra flags are %lu", |
1890 | srcpath, sb.f_flag, required_flags); | |
0ac4b28a CB |
1891 | |
1892 | /* If this was a bind mount request, and required_flags | |
2938f7c8 | 1893 | * does not have any flags which are not already in |
0ac4b28a | 1894 | * mountflags, then skip the remount. |
2938f7c8 | 1895 | */ |
94bef7e4 TA |
1896 | if (!(mountflags & MS_REMOUNT) && |
1897 | (!(required_flags & ~mountflags) && !(mountflags & MS_RDONLY))) { | |
15f3e22b CB |
1898 | DEBUG("Mountflags already were %lu, skipping remount", mountflags); |
1899 | goto skipremount; | |
2938f7c8 | 1900 | } |
0ac4b28a | 1901 | |
2938f7c8 | 1902 | mountflags |= required_flags; |
6fd5e769 | 1903 | } |
614305f3 | 1904 | #endif |
911324ef | 1905 | |
181437fd | 1906 | ret = mount(srcpath, target, fstype, mountflags | MS_REMOUNT, data); |
0ac4b28a | 1907 | if (ret < 0) { |
55022530 CB |
1908 | if (optional) |
1909 | return log_info_errno(0, errno, "Failed to mount \"%s\" on \"%s\" (optional)", | |
1910 | srcpath ? srcpath : "(null)", | |
1911 | target); | |
1912 | ||
1913 | return log_error_errno(-1, errno, "Failed to mount \"%s\" on \"%s\"", | |
1914 | srcpath ? srcpath : "(null)", | |
1915 | target); | |
911324ef DL |
1916 | } |
1917 | } | |
1918 | ||
a3ed9b81 | 1919 | #ifdef HAVE_STATVFS |
1920 | skipremount: | |
1921 | #endif | |
d840039e YT |
1922 | if (pflags) { |
1923 | ret = mount(NULL, target, NULL, pflags, NULL); | |
1924 | if (ret < 0) { | |
55022530 CB |
1925 | if (optional) |
1926 | return log_info_errno(0, errno, "Failed to change mount propagation for \"%s\" (optional)", target); | |
1927 | else | |
1928 | return log_error_errno(-1, errno, "Failed to change mount propagation for \"%s\" (optional)", target); | |
d840039e YT |
1929 | } |
1930 | DEBUG("Changed mount propagation for \"%s\"", target); | |
1931 | } | |
1932 | ||
0103eb53 | 1933 | DEBUG("Mounted \"%s\" on \"%s\" with filesystem type \"%s\"", |
181437fd | 1934 | srcpath ? srcpath : "(null)", target, fstype); |
911324ef DL |
1935 | |
1936 | return 0; | |
1937 | } | |
1938 | ||
c5e30de4 | 1939 | /* Remove "optional", "create=dir", and "create=file" from mntopt */ |
4e4ca161 SH |
1940 | static void cull_mntent_opt(struct mntent *mntent) |
1941 | { | |
1942 | int i; | |
0fd73091 CB |
1943 | char *list[] = { |
1944 | "create=dir", | |
1945 | "create=file", | |
1946 | "optional", | |
1947 | "relative", | |
1948 | NULL | |
1949 | }; | |
c5e30de4 CB |
1950 | |
1951 | for (i = 0; list[i]; i++) { | |
1952 | char *p, *p2; | |
1953 | ||
1954 | p = strstr(mntent->mnt_opts, list[i]); | |
1955 | if (!p) | |
4e4ca161 | 1956 | continue; |
c5e30de4 | 1957 | |
4e4ca161 SH |
1958 | p2 = strchr(p, ','); |
1959 | if (!p2) { | |
1960 | /* no more mntopts, so just chop it here */ | |
1961 | *p = '\0'; | |
1962 | continue; | |
1963 | } | |
c5e30de4 CB |
1964 | |
1965 | memmove(p, p2 + 1, strlen(p2 + 1) + 1); | |
4e4ca161 SH |
1966 | } |
1967 | } | |
1968 | ||
4d5b72a1 | 1969 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
749f98d9 CB |
1970 | const char *path, |
1971 | const struct lxc_rootfs *rootfs, | |
0fd73091 | 1972 | const char *lxc_name, const char *lxc_path) |
0ad19a3f | 1973 | { |
7a76eeaa | 1974 | __do_free char *p1 = NULL; |
3b7e332f | 1975 | int ret; |
7a76eeaa | 1976 | char *p2; |
911324ef | 1977 | |
12e6ab5d | 1978 | if (strncmp(mntent->mnt_type, "overlay", 7) == 0) { |
749f98d9 | 1979 | ret = ovl_mkdir(mntent, rootfs, lxc_name, lxc_path); |
12e6ab5d CB |
1980 | if (ret < 0) |
1981 | return -1; | |
1982 | } | |
6e46cc0d | 1983 | |
34cfffb3 | 1984 | if (hasmntopt(mntent, "create=dir")) { |
749f98d9 | 1985 | ret = mkdir_p(path, 0755); |
55022530 CB |
1986 | if (ret < 0 && errno != EEXIST) |
1987 | return log_error_errno(-1, errno, "Failed to create directory \"%s\"", path); | |
34cfffb3 SG |
1988 | } |
1989 | ||
0fd73091 CB |
1990 | if (!hasmntopt(mntent, "create=file")) |
1991 | return 0; | |
749f98d9 | 1992 | |
0fd73091 CB |
1993 | ret = access(path, F_OK); |
1994 | if (ret == 0) | |
1995 | return 0; | |
749f98d9 | 1996 | |
0fd73091 CB |
1997 | p1 = strdup(path); |
1998 | if (!p1) | |
1999 | return -1; | |
749f98d9 | 2000 | |
0fd73091 | 2001 | p2 = dirname(p1); |
749f98d9 | 2002 | |
0fd73091 | 2003 | ret = mkdir_p(p2, 0755); |
55022530 CB |
2004 | if (ret < 0 && errno != EEXIST) |
2005 | return log_error_errno(-1, errno, "Failed to create directory \"%s\"", path); | |
749f98d9 | 2006 | |
3b7e332f CB |
2007 | ret = mknod(path, S_IFREG | 0000, 0); |
2008 | if (ret < 0 && errno != EEXIST) | |
2009 | return -errno; | |
0fd73091 | 2010 | |
749f98d9 | 2011 | return 0; |
4d5b72a1 NC |
2012 | } |
2013 | ||
ec50007f CB |
2014 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
2015 | * without a rootfs. */ | |
db4aba38 | 2016 | static inline int mount_entry_on_generic(struct mntent *mntent, |
d8b712bc CB |
2017 | const char *path, |
2018 | const struct lxc_rootfs *rootfs, | |
2019 | const char *lxc_name, | |
2020 | const char *lxc_path) | |
4d5b72a1 | 2021 | { |
fd214f37 | 2022 | __do_free char *mntdata = NULL; |
a08bfbe3 CB |
2023 | unsigned long mntflags = 0, pflags = 0; |
2024 | char *rootfs_path = NULL; | |
d8b712bc | 2025 | int ret; |
181437fd | 2026 | bool dev, optional, relative; |
d8b712bc CB |
2027 | |
2028 | optional = hasmntopt(mntent, "optional") != NULL; | |
2029 | dev = hasmntopt(mntent, "dev") != NULL; | |
181437fd | 2030 | relative = hasmntopt(mntent, "relative") != NULL; |
d8b712bc | 2031 | |
ec50007f CB |
2032 | if (rootfs && rootfs->path) |
2033 | rootfs_path = rootfs->mount; | |
2034 | ||
d8b712bc CB |
2035 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, |
2036 | lxc_path); | |
2037 | if (ret < 0) { | |
2038 | if (optional) | |
2039 | return 0; | |
608e3567 | 2040 | |
d8b712bc CB |
2041 | return -1; |
2042 | } | |
4e4ca161 SH |
2043 | cull_mntent_opt(mntent); |
2044 | ||
d840039e YT |
2045 | ret = parse_propagationopts(mntent->mnt_opts, &pflags); |
2046 | if (ret < 0) | |
2047 | return -1; | |
2048 | ||
d8b712bc CB |
2049 | ret = parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata); |
2050 | if (ret < 0) | |
a08bfbe3 | 2051 | return ret; |
a17b1e65 | 2052 | |
6e46cc0d | 2053 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
d840039e | 2054 | pflags, mntdata, optional, dev, relative, rootfs_path); |
68c152ef | 2055 | |
911324ef DL |
2056 | return ret; |
2057 | } | |
2058 | ||
db4aba38 NC |
2059 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
2060 | { | |
1433c9f9 | 2061 | int ret; |
6b5a54cd | 2062 | char path[PATH_MAX]; |
1433c9f9 CB |
2063 | |
2064 | /* For containers created without a rootfs all mounts are treated as | |
07667a6a CB |
2065 | * absolute paths starting at / on the host. |
2066 | */ | |
1433c9f9 CB |
2067 | if (mntent->mnt_dir[0] != '/') |
2068 | ret = snprintf(path, sizeof(path), "/%s", mntent->mnt_dir); | |
2069 | else | |
2070 | ret = snprintf(path, sizeof(path), "%s", mntent->mnt_dir); | |
07667a6a | 2071 | if (ret < 0 || ret >= sizeof(path)) |
1433c9f9 | 2072 | return -1; |
1433c9f9 CB |
2073 | |
2074 | return mount_entry_on_generic(mntent, path, NULL, NULL, NULL); | |
db4aba38 NC |
2075 | } |
2076 | ||
4e4ca161 | 2077 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 | 2078 | const struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2079 | const char *lxc_name, |
2080 | const char *lxc_path) | |
911324ef | 2081 | { |
bdd2b34c | 2082 | int offset; |
013bd428 | 2083 | char *aux; |
67e571de | 2084 | const char *lxcpath; |
6b5a54cd | 2085 | char path[PATH_MAX]; |
bdd2b34c | 2086 | int ret = 0; |
0ad19a3f | 2087 | |
593e8478 | 2088 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
bdd2b34c | 2089 | if (!lxcpath) |
2a59a681 | 2090 | return -1; |
2a59a681 | 2091 | |
bdd2b34c CB |
2092 | /* If rootfs->path is a blockdev path, allow container fstab to use |
2093 | * <lxcpath>/<name>/rootfs" as the target prefix. | |
2094 | */ | |
6b5a54cd CB |
2095 | ret = snprintf(path, PATH_MAX, "%s/%s/rootfs", lxcpath, lxc_name); |
2096 | if (ret < 0 || ret >= PATH_MAX) | |
80a881b2 SH |
2097 | goto skipvarlib; |
2098 | ||
2099 | aux = strstr(mntent->mnt_dir, path); | |
2100 | if (aux) { | |
2101 | offset = strlen(path); | |
2102 | goto skipabs; | |
2103 | } | |
2104 | ||
2105 | skipvarlib: | |
013bd428 | 2106 | aux = strstr(mntent->mnt_dir, rootfs->path); |
55022530 CB |
2107 | if (!aux) |
2108 | return log_warn(ret, "Ignoring mount point \"%s\"", mntent->mnt_dir); | |
80a881b2 SH |
2109 | offset = strlen(rootfs->path); |
2110 | ||
2111 | skipabs: | |
6b5a54cd CB |
2112 | ret = snprintf(path, PATH_MAX, "%s/%s", rootfs->mount, aux + offset); |
2113 | if (ret < 0 || ret >= PATH_MAX) | |
a17b1e65 | 2114 | return -1; |
a17b1e65 | 2115 | |
0a2dddd4 | 2116 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef | 2117 | } |
d330fe7b | 2118 | |
4e4ca161 | 2119 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
0a2dddd4 CB |
2120 | const struct lxc_rootfs *rootfs, |
2121 | const char *lxc_name, | |
2122 | const char *lxc_path) | |
911324ef | 2123 | { |
911324ef | 2124 | int ret; |
6b5a54cd | 2125 | char path[PATH_MAX]; |
d330fe7b | 2126 | |
34cfffb3 | 2127 | /* relative to root mount point */ |
6e46cc0d | 2128 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs->mount, mntent->mnt_dir); |
0fd73091 | 2129 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
9ba8130c | 2130 | return -1; |
911324ef | 2131 | |
0a2dddd4 | 2132 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef DL |
2133 | } |
2134 | ||
06749971 CB |
2135 | static int mount_file_entries(const struct lxc_conf *conf, |
2136 | const struct lxc_rootfs *rootfs, FILE *file, | |
1ae3c19f | 2137 | const char *lxc_name, const char *lxc_path) |
911324ef | 2138 | { |
9d03d857 | 2139 | char buf[PATH_MAX]; |
0fd73091 | 2140 | struct mntent mntent; |
e76b8764 | 2141 | |
aaf901be | 2142 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
9d03d857 CB |
2143 | int ret; |
2144 | ||
1ae3c19f CB |
2145 | if (!rootfs->path) |
2146 | ret = mount_entry_on_systemfs(&mntent); | |
2147 | else if (mntent.mnt_dir[0] != '/') | |
2148 | ret = mount_entry_on_relative_rootfs(&mntent, rootfs, | |
2149 | lxc_name, lxc_path); | |
2150 | else | |
2151 | ret = mount_entry_on_absolute_rootfs(&mntent, rootfs, | |
9d03d857 | 2152 | lxc_name, lxc_path); |
1ae3c19f CB |
2153 | if (ret < 0) |
2154 | return -1; | |
0ad19a3f | 2155 | } |
cd54d859 | 2156 | |
55022530 CB |
2157 | if (!feof(file) || ferror(file)) |
2158 | return log_error(-1, "Failed to parse mount entries"); | |
9d03d857 CB |
2159 | |
2160 | return 0; | |
e7938e9e MN |
2161 | } |
2162 | ||
55022530 CB |
2163 | static inline void __auto_endmntent__(FILE **f) |
2164 | { | |
2165 | if (*f) | |
2166 | endmntent(*f); | |
2167 | } | |
2168 | ||
2169 | #define __do_endmntent __attribute__((__cleanup__(__auto_endmntent__))) | |
2170 | ||
06749971 CB |
2171 | static int setup_mount(const struct lxc_conf *conf, |
2172 | const struct lxc_rootfs *rootfs, const char *fstab, | |
42dff448 | 2173 | const char *lxc_name, const char *lxc_path) |
e7938e9e | 2174 | { |
55022530 | 2175 | __do_endmntent FILE *f = NULL; |
e7938e9e MN |
2176 | int ret; |
2177 | ||
2178 | if (!fstab) | |
2179 | return 0; | |
2180 | ||
55022530 CB |
2181 | f = setmntent(fstab, "re"); |
2182 | if (!f) | |
2183 | return log_error_errno(-1, errno, "Failed to open \"%s\"", fstab); | |
e7938e9e | 2184 | |
06749971 | 2185 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
42dff448 CB |
2186 | if (ret < 0) |
2187 | ERROR("Failed to set up mount entries"); | |
e7938e9e | 2188 | |
0ad19a3f | 2189 | return ret; |
2190 | } | |
2191 | ||
1800f924 WB |
2192 | /* |
2193 | * In order for nested containers to be able to mount /proc and /sys they need | |
2194 | * to see a "pure" proc and sysfs mount points with nothing mounted on top | |
2195 | * (like lxcfs). | |
2196 | * For this we provide proc and sysfs in /dev/.lxc/{proc,sys} while using an | |
2197 | * apparmor rule to deny access to them. This is mostly for convenience: The | |
2198 | * container's root user can mount them anyway and thus has access to the two | |
2199 | * file systems. But a non-root user in the container should not be allowed to | |
2200 | * access them as a side effect without explicitly allowing it. | |
2201 | */ | |
2202 | static const char nesting_helpers[] = | |
dc691e34 CB |
2203 | "proc dev/.lxc/proc proc create=dir,optional 0 0\n" |
2204 | "sys dev/.lxc/sys sysfs create=dir,optional 0 0\n"; | |
1800f924 WB |
2205 | |
2206 | FILE *make_anonymous_mount_file(struct lxc_list *mount, | |
2207 | bool include_nesting_helpers) | |
e7938e9e | 2208 | { |
f62cf1d4 | 2209 | __do_close int fd = -EBADF; |
4110345b | 2210 | FILE *f; |
5ef5c9a3 | 2211 | int ret; |
e7938e9e | 2212 | char *mount_entry; |
5ef5c9a3 | 2213 | struct lxc_list *iterator; |
5ef5c9a3 | 2214 | |
0fd73091 | 2215 | fd = memfd_create(".lxc_mount_file", MFD_CLOEXEC); |
5ef5c9a3 | 2216 | if (fd < 0) { |
a324e7eb CB |
2217 | char template[] = P_tmpdir "/.lxc_mount_file_XXXXXX"; |
2218 | ||
5ef5c9a3 CB |
2219 | if (errno != ENOSYS) |
2220 | return NULL; | |
a324e7eb CB |
2221 | |
2222 | fd = lxc_make_tmpfile(template, true); | |
55022530 CB |
2223 | if (fd < 0) |
2224 | return log_error_errno(NULL, errno, "Could not create temporary mount file"); | |
0fd73091 | 2225 | |
6bd04140 | 2226 | TRACE("Created temporary mount file"); |
5ef5c9a3 | 2227 | } |
e7938e9e | 2228 | |
0fd73091 CB |
2229 | lxc_list_for_each (iterator, mount) { |
2230 | size_t len; | |
2231 | ||
e7938e9e | 2232 | mount_entry = iterator->elem; |
0fd73091 | 2233 | len = strlen(mount_entry); |
5ef5c9a3 | 2234 | |
489f39be | 2235 | ret = lxc_write_nointr(fd, mount_entry, len); |
0fd73091 | 2236 | if (ret != len) |
79bcf5ee | 2237 | return NULL; |
0fd73091 | 2238 | |
489f39be | 2239 | ret = lxc_write_nointr(fd, "\n", 1); |
0fd73091 | 2240 | if (ret != 1) |
79bcf5ee | 2241 | return NULL; |
e7938e9e MN |
2242 | } |
2243 | ||
1800f924 WB |
2244 | if (include_nesting_helpers) { |
2245 | ret = lxc_write_nointr(fd, nesting_helpers, | |
6333c915 CB |
2246 | STRARRAYLEN(nesting_helpers)); |
2247 | if (ret != STRARRAYLEN(nesting_helpers)) | |
79bcf5ee | 2248 | return NULL; |
1800f924 WB |
2249 | } |
2250 | ||
0fd73091 CB |
2251 | ret = lseek(fd, 0, SEEK_SET); |
2252 | if (ret < 0) | |
79bcf5ee | 2253 | return NULL; |
0fd73091 | 2254 | |
4110345b CB |
2255 | f = fdopen(fd, "re+"); |
2256 | if (f) | |
2257 | move_fd(fd); /* Transfer ownership of fd. */ | |
2258 | return f; | |
9fc7f8c0 TA |
2259 | } |
2260 | ||
06749971 CB |
2261 | static int setup_mount_entries(const struct lxc_conf *conf, |
2262 | const struct lxc_rootfs *rootfs, | |
5ef5c9a3 CB |
2263 | struct lxc_list *mount, const char *lxc_name, |
2264 | const char *lxc_path) | |
9fc7f8c0 | 2265 | { |
c85ced65 | 2266 | __do_fclose FILE *f = NULL; |
9fc7f8c0 | 2267 | |
1800f924 | 2268 | f = make_anonymous_mount_file(mount, conf->lsm_aa_allow_nesting); |
19b5d755 | 2269 | if (!f) |
9fc7f8c0 | 2270 | return -1; |
e7938e9e | 2271 | |
c85ced65 | 2272 | return mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
e7938e9e MN |
2273 | } |
2274 | ||
bab88e68 CS |
2275 | static int parse_cap(const char *cap) |
2276 | { | |
84760c11 | 2277 | size_t i; |
2278 | int capid = -1; | |
0fd73091 CB |
2279 | size_t end = sizeof(caps_opt) / sizeof(caps_opt[0]); |
2280 | char *ptr = NULL; | |
bab88e68 | 2281 | |
0fd73091 | 2282 | if (strcmp(cap, "none") == 0) |
7035407c DE |
2283 | return -2; |
2284 | ||
8560cd36 | 2285 | for (i = 0; i < end; i++) { |
bab88e68 CS |
2286 | if (strcmp(cap, caps_opt[i].name)) |
2287 | continue; | |
2288 | ||
2289 | capid = caps_opt[i].value; | |
2290 | break; | |
2291 | } | |
2292 | ||
2293 | if (capid < 0) { | |
0fd73091 CB |
2294 | /* Try to see if it's numeric, so the user may specify |
2295 | * capabilities that the running kernel knows about but we | |
2296 | * don't | |
2297 | */ | |
bab88e68 CS |
2298 | errno = 0; |
2299 | capid = strtol(cap, &ptr, 10); | |
2300 | if (!ptr || *ptr != '\0' || errno != 0) | |
2301 | /* not a valid number */ | |
2302 | capid = -1; | |
2303 | else if (capid > lxc_caps_last_cap()) | |
2304 | /* we have a number but it's not a valid | |
2305 | * capability */ | |
2306 | capid = -1; | |
2307 | } | |
2308 | ||
2309 | return capid; | |
2310 | } | |
2311 | ||
0769b82a CS |
2312 | int in_caplist(int cap, struct lxc_list *caps) |
2313 | { | |
0769b82a | 2314 | int capid; |
0fd73091 | 2315 | struct lxc_list *iterator; |
0769b82a | 2316 | |
0fd73091 | 2317 | lxc_list_for_each (iterator, caps) { |
0769b82a CS |
2318 | capid = parse_cap(iterator->elem); |
2319 | if (capid == cap) | |
2320 | return 1; | |
2321 | } | |
2322 | ||
2323 | return 0; | |
2324 | } | |
2325 | ||
81810dd1 DL |
2326 | static int setup_caps(struct lxc_list *caps) |
2327 | { | |
bab88e68 | 2328 | int capid; |
0fd73091 CB |
2329 | char *drop_entry; |
2330 | struct lxc_list *iterator; | |
81810dd1 | 2331 | |
0fd73091 CB |
2332 | lxc_list_for_each (iterator, caps) { |
2333 | int ret; | |
81810dd1 DL |
2334 | |
2335 | drop_entry = iterator->elem; | |
2336 | ||
bab88e68 | 2337 | capid = parse_cap(drop_entry); |
55022530 CB |
2338 | if (capid < 0) |
2339 | return log_error(-1, "unknown capability %s", drop_entry); | |
81810dd1 | 2340 | |
b81689a1 CB |
2341 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(capid), prctl_arg(0), |
2342 | prctl_arg(0), prctl_arg(0)); | |
55022530 CB |
2343 | if (ret < 0) |
2344 | return log_error_errno(-1, errno, "Failed to remove %s capability", drop_entry); | |
0fd73091 | 2345 | DEBUG("Dropped %s (%d) capability", drop_entry, capid); |
81810dd1 DL |
2346 | } |
2347 | ||
0fd73091 | 2348 | DEBUG("Capabilities have been setup"); |
1fb86a7c SH |
2349 | return 0; |
2350 | } | |
2351 | ||
2352 | static int dropcaps_except(struct lxc_list *caps) | |
2353 | { | |
2f443e88 | 2354 | __do_free int *caplist = NULL; |
0fd73091 | 2355 | int i, capid, numcaps; |
1fb86a7c | 2356 | char *keep_entry; |
0fd73091 | 2357 | struct lxc_list *iterator; |
1fb86a7c | 2358 | |
0fd73091 | 2359 | numcaps = lxc_caps_last_cap() + 1; |
2caf9a97 SH |
2360 | if (numcaps <= 0 || numcaps > 200) |
2361 | return -1; | |
0fd73091 | 2362 | TRACE("Found %d capabilities", numcaps); |
2caf9a97 | 2363 | |
1a0e70ac | 2364 | /* caplist[i] is 1 if we keep capability i */ |
2f443e88 | 2365 | caplist = must_realloc(NULL, numcaps * sizeof(int)); |
1fb86a7c SH |
2366 | memset(caplist, 0, numcaps * sizeof(int)); |
2367 | ||
0fd73091 | 2368 | lxc_list_for_each (iterator, caps) { |
1fb86a7c SH |
2369 | keep_entry = iterator->elem; |
2370 | ||
bab88e68 | 2371 | capid = parse_cap(keep_entry); |
7035407c DE |
2372 | if (capid == -2) |
2373 | continue; | |
2374 | ||
55022530 CB |
2375 | if (capid < 0) |
2376 | return log_error(-1, "Unknown capability %s", keep_entry); | |
1fb86a7c | 2377 | |
0fd73091 | 2378 | DEBUG("Keep capability %s (%d)", keep_entry, capid); |
1fb86a7c SH |
2379 | caplist[capid] = 1; |
2380 | } | |
0fd73091 CB |
2381 | |
2382 | for (i = 0; i < numcaps; i++) { | |
2383 | int ret; | |
2384 | ||
1fb86a7c SH |
2385 | if (caplist[i]) |
2386 | continue; | |
0fd73091 | 2387 | |
b81689a1 CB |
2388 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(i), prctl_arg(0), |
2389 | prctl_arg(0), prctl_arg(0)); | |
55022530 CB |
2390 | if (ret < 0) |
2391 | return log_error_errno(-1, errno, "Failed to remove capability %d", i); | |
1fb86a7c SH |
2392 | } |
2393 | ||
0fd73091 | 2394 | DEBUG("Capabilities have been setup"); |
81810dd1 DL |
2395 | return 0; |
2396 | } | |
2397 | ||
0fd73091 CB |
2398 | static int parse_resource(const char *res) |
2399 | { | |
2400 | int ret; | |
c6d09e15 WB |
2401 | size_t i; |
2402 | int resid = -1; | |
2403 | ||
0fd73091 | 2404 | for (i = 0; i < sizeof(limit_opt) / sizeof(limit_opt[0]); ++i) |
c6d09e15 WB |
2405 | if (strcmp(res, limit_opt[i].name) == 0) |
2406 | return limit_opt[i].value; | |
c6d09e15 | 2407 | |
0fd73091 | 2408 | /* Try to see if it's numeric, so the user may specify |
c6d09e15 | 2409 | * resources that the running kernel knows about but |
0fd73091 CB |
2410 | * we don't. |
2411 | */ | |
2412 | ret = lxc_safe_int(res, &resid); | |
2413 | if (ret < 0) | |
2414 | return -1; | |
2415 | ||
2416 | return resid; | |
c6d09e15 WB |
2417 | } |
2418 | ||
0fd73091 CB |
2419 | int setup_resource_limits(struct lxc_list *limits, pid_t pid) |
2420 | { | |
2421 | int resid; | |
c6d09e15 WB |
2422 | struct lxc_list *it; |
2423 | struct lxc_limit *lim; | |
c6d09e15 | 2424 | |
0fd73091 | 2425 | lxc_list_for_each (it, limits) { |
c6d09e15 WB |
2426 | lim = it->elem; |
2427 | ||
2428 | resid = parse_resource(lim->resource); | |
55022530 CB |
2429 | if (resid < 0) |
2430 | return log_error(-1, "Unknown resource %s", lim->resource); | |
c6d09e15 | 2431 | |
f48b5fd8 | 2432 | #if HAVE_PRLIMIT || HAVE_PRLIMIT64 |
55022530 CB |
2433 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) |
2434 | return log_error_errno(-1, errno, "Failed to set limit %s", lim->resource); | |
2de12765 CB |
2435 | |
2436 | TRACE("Setup \"%s\" limit", lim->resource); | |
f48b5fd8 | 2437 | #else |
55022530 | 2438 | return log_error(-1, "Cannot set limit \"%s\" as prlimit is missing", lim->resource); |
f48b5fd8 | 2439 | #endif |
c6d09e15 | 2440 | } |
0fd73091 | 2441 | |
c6d09e15 WB |
2442 | return 0; |
2443 | } | |
2444 | ||
7edd0540 L |
2445 | int setup_sysctl_parameters(struct lxc_list *sysctls) |
2446 | { | |
e6f76452 | 2447 | __do_free char *tmp = NULL; |
7edd0540 L |
2448 | struct lxc_list *it; |
2449 | struct lxc_sysctl *elem; | |
0fd73091 | 2450 | int ret = 0; |
6b5a54cd | 2451 | char filename[PATH_MAX] = {0}; |
7edd0540 | 2452 | |
0fd73091 | 2453 | lxc_list_for_each (it, sysctls) { |
7edd0540 L |
2454 | elem = it->elem; |
2455 | tmp = lxc_string_replace(".", "/", elem->key); | |
55022530 CB |
2456 | if (!tmp) |
2457 | return log_error(-1, "Failed to replace key %s", elem->key); | |
7edd0540 L |
2458 | |
2459 | ret = snprintf(filename, sizeof(filename), "/proc/sys/%s", tmp); | |
55022530 CB |
2460 | if (ret < 0 || (size_t)ret >= sizeof(filename)) |
2461 | return log_error(-1, "Error setting up sysctl parameters path"); | |
7edd0540 | 2462 | |
0fd73091 | 2463 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2464 | strlen(elem->value), false, 0666); |
55022530 CB |
2465 | if (ret < 0) |
2466 | return log_error_errno(-1, errno, "Failed to setup sysctl parameters %s to %s", | |
2467 | elem->key, elem->value); | |
7edd0540 | 2468 | } |
0fd73091 | 2469 | |
7edd0540 L |
2470 | return 0; |
2471 | } | |
2472 | ||
61d7a733 YT |
2473 | int setup_proc_filesystem(struct lxc_list *procs, pid_t pid) |
2474 | { | |
0c669152 | 2475 | __do_free char *tmp = NULL; |
61d7a733 YT |
2476 | struct lxc_list *it; |
2477 | struct lxc_proc *elem; | |
0fd73091 | 2478 | int ret = 0; |
6b5a54cd | 2479 | char filename[PATH_MAX] = {0}; |
61d7a733 | 2480 | |
0fd73091 | 2481 | lxc_list_for_each (it, procs) { |
61d7a733 YT |
2482 | elem = it->elem; |
2483 | tmp = lxc_string_replace(".", "/", elem->filename); | |
55022530 CB |
2484 | if (!tmp) |
2485 | return log_error(-1, "Failed to replace key %s", elem->filename); | |
61d7a733 YT |
2486 | |
2487 | ret = snprintf(filename, sizeof(filename), "/proc/%d/%s", pid, tmp); | |
55022530 CB |
2488 | if (ret < 0 || (size_t)ret >= sizeof(filename)) |
2489 | return log_error(-1, "Error setting up proc filesystem path"); | |
61d7a733 | 2490 | |
0fd73091 | 2491 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2492 | strlen(elem->value), false, 0666); |
55022530 CB |
2493 | if (ret < 0) |
2494 | return log_error_errno(-1, errno, "Failed to setup proc filesystem %s to %s", elem->filename, elem->value); | |
61d7a733 | 2495 | } |
0fd73091 | 2496 | |
61d7a733 YT |
2497 | return 0; |
2498 | } | |
2499 | ||
ae9242c8 SH |
2500 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2501 | ||
7b379ab3 | 2502 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2503 | { |
26ddeedd | 2504 | int i; |
0fd73091 | 2505 | struct lxc_conf *new; |
7b379ab3 | 2506 | |
13277ec4 | 2507 | new = malloc(sizeof(*new)); |
0fd73091 | 2508 | if (!new) |
7b379ab3 | 2509 | return NULL; |
7b379ab3 MN |
2510 | memset(new, 0, sizeof(*new)); |
2511 | ||
4b73005c | 2512 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
cccc74b5 | 2513 | new->personality = -1; |
124fa0a8 | 2514 | new->autodev = 1; |
3a784510 | 2515 | new->console.buffer_size = 0; |
596a818d DE |
2516 | new->console.log_path = NULL; |
2517 | new->console.log_fd = -1; | |
861813e5 | 2518 | new->console.log_size = 0; |
28a4b0e5 | 2519 | new->console.path = NULL; |
63376d7d | 2520 | new->console.peer = -1; |
fb87aa6a CB |
2521 | new->console.proxy.busy = -1; |
2522 | new->console.proxy.master = -1; | |
2523 | new->console.proxy.slave = -1; | |
63376d7d DL |
2524 | new->console.master = -1; |
2525 | new->console.slave = -1; | |
2526 | new->console.name[0] = '\0'; | |
732375f5 | 2527 | memset(&new->console.ringbuf, 0, sizeof(struct lxc_ringbuf)); |
d2e30e99 | 2528 | new->maincmd_fd = -1; |
258f8051 | 2529 | new->monitor_signal_pdeath = SIGKILL; |
76a26f55 | 2530 | new->nbd_idx = -1; |
54c30e29 | 2531 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 2532 | if (!new->rootfs.mount) { |
53f3f048 SH |
2533 | free(new); |
2534 | return NULL; | |
2535 | } | |
6e54330c | 2536 | new->rootfs.managed = true; |
858377e4 | 2537 | new->logfd = -1; |
7b379ab3 | 2538 | lxc_list_init(&new->cgroup); |
54860ed0 | 2539 | lxc_list_init(&new->cgroup2); |
4bfb655e | 2540 | lxc_list_init(&new->devices); |
7b379ab3 MN |
2541 | lxc_list_init(&new->network); |
2542 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2543 | lxc_list_init(&new->caps); |
1fb86a7c | 2544 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2545 | lxc_list_init(&new->id_map); |
46ad64ab CB |
2546 | new->root_nsuid_map = NULL; |
2547 | new->root_nsgid_map = NULL; | |
f979ac15 | 2548 | lxc_list_init(&new->includes); |
4184c3e1 | 2549 | lxc_list_init(&new->aliens); |
7c661726 | 2550 | lxc_list_init(&new->environment); |
c6d09e15 | 2551 | lxc_list_init(&new->limits); |
7edd0540 | 2552 | lxc_list_init(&new->sysctls); |
61d7a733 | 2553 | lxc_list_init(&new->procs); |
44ae0fb6 | 2554 | new->hooks_version = 0; |
28d9e29e | 2555 | for (i = 0; i < NUM_LXC_HOOKS; i++) |
26ddeedd | 2556 | lxc_list_init(&new->hooks[i]); |
ee1e7aa0 | 2557 | lxc_list_init(&new->groups); |
d39b10eb | 2558 | lxc_list_init(&new->state_clients); |
fe4de9a6 | 2559 | new->lsm_aa_profile = NULL; |
1800f924 | 2560 | lxc_list_init(&new->lsm_aa_raw); |
fe4de9a6 | 2561 | new->lsm_se_context = NULL; |
4fef78bc | 2562 | new->lsm_se_keyring_context = NULL; |
8f818a84 | 2563 | new->keyring_disable_session = false; |
7a0bcca3 | 2564 | new->tmp_umount_proc = false; |
7a41e857 LT |
2565 | new->tmp_umount_proc = 0; |
2566 | new->shmount.path_host = NULL; | |
2567 | new->shmount.path_cont = NULL; | |
7b379ab3 | 2568 | |
72bb04e4 PT |
2569 | /* if running in a new user namespace, init and COMMAND |
2570 | * default to running as UID/GID 0 when using lxc-execute */ | |
2571 | new->init_uid = 0; | |
2572 | new->init_gid = 0; | |
43654d34 | 2573 | memset(&new->cgroup_meta, 0, sizeof(struct lxc_cgroup)); |
b074bbf1 | 2574 | memset(&new->ns_share, 0, sizeof(char *) * LXC_NS_MAX); |
c3e3c21a | 2575 | seccomp_conf_init(new); |
72bb04e4 | 2576 | |
7b379ab3 | 2577 | return new; |
089cd8b8 DL |
2578 | } |
2579 | ||
344c9d81 | 2580 | int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
a19b974f | 2581 | size_t buf_size) |
f6d3e3e4 | 2582 | { |
f62cf1d4 | 2583 | __do_close int fd = -EBADF; |
76bcd422 | 2584 | int ret; |
6b5a54cd | 2585 | char path[PATH_MAX]; |
f6d3e3e4 | 2586 | |
a19b974f | 2587 | if (geteuid() != 0 && idtype == ID_TYPE_GID) { |
f62cf1d4 | 2588 | __do_close int setgroups_fd = -EBADF; |
a19b974f | 2589 | |
6b5a54cd CB |
2590 | ret = snprintf(path, PATH_MAX, "/proc/%d/setgroups", pid); |
2591 | if (ret < 0 || ret >= PATH_MAX) | |
a19b974f | 2592 | return -E2BIG; |
a19b974f | 2593 | |
76bcd422 | 2594 | setgroups_fd = open(path, O_WRONLY); |
55022530 CB |
2595 | if (setgroups_fd < 0 && errno != ENOENT) |
2596 | return log_error_errno(-1, errno, "Failed to open \"%s\"", path); | |
a19b974f | 2597 | |
76bcd422 CB |
2598 | if (setgroups_fd >= 0) { |
2599 | ret = lxc_write_nointr(setgroups_fd, "deny\n", | |
2600 | STRLITERALLEN("deny\n")); | |
55022530 CB |
2601 | if (ret != STRLITERALLEN("deny\n")) |
2602 | return log_error_errno(-1, errno, "Failed to write \"deny\" to \"/proc/%d/setgroups\"", pid); | |
395b1a3e | 2603 | TRACE("Wrote \"deny\" to \"/proc/%d/setgroups\"", pid); |
a19b974f | 2604 | } |
a19b974f CB |
2605 | } |
2606 | ||
6b5a54cd | 2607 | ret = snprintf(path, PATH_MAX, "/proc/%d/%cid_map", pid, |
29053180 | 2608 | idtype == ID_TYPE_UID ? 'u' : 'g'); |
6b5a54cd | 2609 | if (ret < 0 || ret >= PATH_MAX) |
f6d3e3e4 | 2610 | return -E2BIG; |
29053180 | 2611 | |
55022530 CB |
2612 | fd = open(path, O_WRONLY | O_CLOEXEC); |
2613 | if (fd < 0) | |
2614 | return log_error_errno(-1, errno, "Failed to open \"%s\"", path); | |
29053180 | 2615 | |
29053180 | 2616 | ret = lxc_write_nointr(fd, buf, buf_size); |
55022530 CB |
2617 | if (ret != buf_size) |
2618 | return log_error_errno(-1, errno, "Failed to write %cid mapping to \"%s\"", | |
2619 | idtype == ID_TYPE_UID ? 'u' : 'g', path); | |
29053180 CB |
2620 | |
2621 | return 0; | |
f6d3e3e4 SH |
2622 | } |
2623 | ||
6e50e704 CB |
2624 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
2625 | * | |
2626 | * @return 1 if functional binary was found | |
2627 | * @return 0 if binary exists but is lacking privilege | |
2628 | * @return -ENOENT if binary does not exist | |
2629 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
6e50e704 | 2630 | */ |
df6a2945 CB |
2631 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
2632 | { | |
48411df2 | 2633 | __do_free char *path = NULL; |
df6a2945 CB |
2634 | int ret; |
2635 | struct stat st; | |
df6a2945 | 2636 | |
3275932b | 2637 | errno = EINVAL; |
6e50e704 | 2638 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
3275932b | 2639 | return -1; |
6e50e704 | 2640 | |
3275932b | 2641 | errno = ENOENT; |
df6a2945 CB |
2642 | path = on_path(binary, NULL); |
2643 | if (!path) | |
3275932b | 2644 | return -1; |
df6a2945 CB |
2645 | |
2646 | ret = stat(path, &st); | |
3275932b CB |
2647 | if (ret < 0) |
2648 | return -1; | |
df6a2945 CB |
2649 | |
2650 | /* Check if the binary is setuid. */ | |
55022530 CB |
2651 | if (st.st_mode & S_ISUID) |
2652 | return log_debug(1, "The binary \"%s\" does have the setuid bit set", path); | |
df6a2945 | 2653 | |
0fd73091 | 2654 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
2655 | /* Check if it has the CAP_SETUID capability. */ |
2656 | if ((cap & CAP_SETUID) && | |
2657 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
55022530 CB |
2658 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) |
2659 | return log_debug(1, "The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE and CAP_PERMITTED sets", path); | |
df6a2945 CB |
2660 | |
2661 | /* Check if it has the CAP_SETGID capability. */ | |
2662 | if ((cap & CAP_SETGID) && | |
2663 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
55022530 CB |
2664 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) |
2665 | return log_debug(1, "The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE and CAP_PERMITTED sets", path); | |
0fd73091 | 2666 | #else |
69924fff CB |
2667 | /* If we cannot check for file capabilities we need to give the benefit |
2668 | * of the doubt. Otherwise we might fail even though all the necessary | |
2669 | * file capabilities are set. | |
2670 | */ | |
55022530 | 2671 | DEBUG("Cannot check for file capabilities as full capability support is missing. Manual intervention needed"); |
0fd73091 | 2672 | #endif |
df6a2945 | 2673 | |
3275932b | 2674 | return 1; |
df6a2945 CB |
2675 | } |
2676 | ||
986ef930 CB |
2677 | int lxc_map_ids_exec_wrapper(void *args) |
2678 | { | |
2679 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
2680 | return -1; | |
2681 | } | |
2682 | ||
f6d3e3e4 SH |
2683 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) |
2684 | { | |
0fd73091 | 2685 | int fill, left; |
986ef930 | 2686 | char u_or_g; |
4bc3b759 | 2687 | char *pos; |
6b5a54cd | 2688 | char cmd_output[PATH_MAX]; |
0fd73091 CB |
2689 | struct id_map *map; |
2690 | struct lxc_list *iterator; | |
2691 | enum idtype type; | |
0fd73091 | 2692 | int ret = 0, gidmap = 0, uidmap = 0; |
c6ba8981 CB |
2693 | char mapbuf[STRLITERALLEN("new@idmap") + STRLITERALLEN(" ") + |
2694 | INTTYPE_TO_STRLEN(pid_t) + STRLITERALLEN(" ") + | |
2695 | LXC_IDMAPLEN] = {0}; | |
0fd73091 | 2696 | bool had_entry = false, use_shadow = false; |
c724025c JC |
2697 | int hostuid, hostgid; |
2698 | ||
2699 | hostuid = geteuid(); | |
2700 | hostgid = getegid(); | |
df6a2945 CB |
2701 | |
2702 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid | |
2703 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
2704 | * will protected it by preventing another user from being handed the |
2705 | * range by shadow. | |
2706 | */ | |
df6a2945 | 2707 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
2708 | if (uidmap == -ENOENT) |
2709 | WARN("newuidmap binary is missing"); | |
2710 | else if (!uidmap) | |
2711 | WARN("newuidmap is lacking necessary privileges"); | |
2712 | ||
df6a2945 | 2713 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
2714 | if (gidmap == -ENOENT) |
2715 | WARN("newgidmap binary is missing"); | |
2716 | else if (!gidmap) | |
2717 | WARN("newgidmap is lacking necessary privileges"); | |
2718 | ||
df6a2945 | 2719 | if (uidmap > 0 && gidmap > 0) { |
0fd73091 | 2720 | DEBUG("Functional newuidmap and newgidmap binary found"); |
4bc3b759 | 2721 | use_shadow = true; |
df6a2945 | 2722 | } else { |
99d43365 CB |
2723 | /* In case unprivileged users run application containers via |
2724 | * execute() or a start*() there are valid cases where they may | |
2725 | * only want to map their own {g,u}id. Let's not block them from | |
2726 | * doing so by requiring geteuid() == 0. | |
2727 | */ | |
2728 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
c724025c JC |
2729 | "write directly with euid %d", hostuid); |
2730 | } | |
2731 | ||
2732 | /* Check if we really need to use newuidmap and newgidmap. | |
2733 | * If the user is only remapping his own {g,u}id, we don't need it. | |
2734 | */ | |
2735 | if (use_shadow && lxc_list_len(idmap) == 2) { | |
2736 | use_shadow = false; | |
2737 | lxc_list_for_each(iterator, idmap) { | |
2738 | map = iterator->elem; | |
2739 | if (map->idtype == ID_TYPE_UID && map->range == 1 && | |
2740 | map->nsid == hostuid && map->hostid == hostuid) | |
2741 | continue; | |
2742 | if (map->idtype == ID_TYPE_GID && map->range == 1 && | |
2743 | map->nsid == hostgid && map->hostid == hostgid) | |
2744 | continue; | |
2745 | use_shadow = true; | |
2746 | break; | |
2747 | } | |
0e6e3a41 | 2748 | } |
251d0d2a | 2749 | |
986ef930 CB |
2750 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
2751 | type++, u_or_g = 'g') { | |
2752 | pos = mapbuf; | |
2753 | ||
0e6e3a41 | 2754 | if (use_shadow) |
986ef930 | 2755 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 2756 | |
cf3ef16d | 2757 | lxc_list_for_each(iterator, idmap) { |
251d0d2a | 2758 | map = iterator->elem; |
cf3ef16d SH |
2759 | if (map->idtype != type) |
2760 | continue; | |
2761 | ||
4bc3b759 CB |
2762 | had_entry = true; |
2763 | ||
986ef930 | 2764 | left = LXC_IDMAPLEN - (pos - mapbuf); |
d1838f34 | 2765 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
2766 | use_shadow ? " " : "", map->nsid, |
2767 | map->hostid, map->range, | |
0e6e3a41 | 2768 | use_shadow ? "" : "\n"); |
55022530 CB |
2769 | /* |
2770 | * The kernel only takes <= 4k for writes to | |
2771 | * /proc/<pid>/{g,u}id_map | |
2772 | */ | |
2773 | if (fill <= 0 || fill >= left) | |
2774 | return log_error_errno(-1, errno, "Too many %cid mappings defined", u_or_g); | |
4bc3b759 | 2775 | |
cf3ef16d | 2776 | pos += fill; |
251d0d2a | 2777 | } |
cf3ef16d | 2778 | if (!had_entry) |
4f7521b4 | 2779 | continue; |
cf3ef16d | 2780 | |
d85813cd | 2781 | /* Try to catch the output of new{g,u}idmap to make debugging |
986ef930 CB |
2782 | * easier. |
2783 | */ | |
2784 | if (use_shadow) { | |
2785 | ret = run_command(cmd_output, sizeof(cmd_output), | |
2786 | lxc_map_ids_exec_wrapper, | |
2787 | (void *)mapbuf); | |
55022530 CB |
2788 | if (ret < 0) |
2789 | return log_error(-1, "new%cidmap failed to write mapping \"%s\": %s", u_or_g, cmd_output, mapbuf); | |
54fbbeb5 | 2790 | TRACE("new%cidmap wrote mapping \"%s\"", u_or_g, mapbuf); |
d1838f34 | 2791 | } else { |
986ef930 | 2792 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
55022530 CB |
2793 | if (ret < 0) |
2794 | return log_error(-1, "Failed to write mapping: %s", mapbuf); | |
54fbbeb5 | 2795 | TRACE("Wrote mapping \"%s\"", mapbuf); |
d1838f34 | 2796 | } |
986ef930 CB |
2797 | |
2798 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 2799 | } |
251d0d2a | 2800 | |
986ef930 | 2801 | return 0; |
f6d3e3e4 SH |
2802 | } |
2803 | ||
234998b4 CB |
2804 | /* |
2805 | * Return the host uid/gid to which the container root is mapped in val. | |
0b3a6504 | 2806 | * Return true if id was found, false otherwise. |
cf3ef16d | 2807 | */ |
234998b4 | 2808 | static id_t get_mapped_rootid(const struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 2809 | { |
4160c3a0 | 2810 | unsigned nsid; |
0fd73091 CB |
2811 | struct id_map *map; |
2812 | struct lxc_list *it; | |
4160c3a0 CB |
2813 | |
2814 | if (idtype == ID_TYPE_UID) | |
2815 | nsid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; | |
2816 | else | |
2817 | nsid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
cf3ef16d | 2818 | |
0fd73091 | 2819 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 2820 | map = it->elem; |
7b50c609 | 2821 | if (map->idtype != idtype) |
cf3ef16d | 2822 | continue; |
4160c3a0 | 2823 | if (map->nsid != nsid) |
cf3ef16d | 2824 | continue; |
234998b4 | 2825 | return map->hostid; |
cf3ef16d | 2826 | } |
4160c3a0 | 2827 | |
234998b4 CB |
2828 | if (idtype == ID_TYPE_UID) |
2829 | return LXC_INVALID_UID; | |
2830 | ||
2831 | return LXC_INVALID_GID; | |
cf3ef16d SH |
2832 | } |
2833 | ||
facdf925 | 2834 | int mapped_hostid(unsigned id, const struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 2835 | { |
cf3ef16d | 2836 | struct id_map *map; |
0fd73091 CB |
2837 | struct lxc_list *it; |
2838 | ||
2839 | lxc_list_for_each (it, &conf->id_map) { | |
cf3ef16d | 2840 | map = it->elem; |
2133f58c | 2841 | if (map->idtype != idtype) |
cf3ef16d | 2842 | continue; |
0fd73091 | 2843 | |
cf3ef16d | 2844 | if (id >= map->hostid && id < map->hostid + map->range) |
57d116ab | 2845 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 2846 | } |
0fd73091 | 2847 | |
57d116ab | 2848 | return -1; |
cf3ef16d SH |
2849 | } |
2850 | ||
7581a82f | 2851 | int find_unmapped_nsid(const struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 2852 | { |
cf3ef16d | 2853 | struct id_map *map; |
0fd73091 | 2854 | struct lxc_list *it; |
2133f58c | 2855 | unsigned int freeid = 0; |
0fd73091 | 2856 | |
cf3ef16d | 2857 | again: |
0fd73091 | 2858 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 2859 | map = it->elem; |
2133f58c | 2860 | if (map->idtype != idtype) |
cf3ef16d | 2861 | continue; |
0fd73091 | 2862 | |
cf3ef16d SH |
2863 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { |
2864 | freeid = map->nsid + map->range; | |
2865 | goto again; | |
2866 | } | |
2867 | } | |
0fd73091 | 2868 | |
cf3ef16d SH |
2869 | return freeid; |
2870 | } | |
2871 | ||
f4f52cb5 CB |
2872 | int chown_mapped_root_exec_wrapper(void *args) |
2873 | { | |
2874 | execvp("lxc-usernsexec", args); | |
2875 | return -1; | |
2876 | } | |
2877 | ||
0fd73091 | 2878 | /* chown_mapped_root: for an unprivileged user with uid/gid X to |
7b50c609 TS |
2879 | * chown a dir to subuid/subgid Y, he needs to run chown as root |
2880 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
2881 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
2882 | * root is privileged with respect to hostuid/hostgid X, allowing | |
2883 | * him to do the chown. | |
f6d3e3e4 | 2884 | */ |
facdf925 | 2885 | int chown_mapped_root(const char *path, const struct lxc_conf *conf) |
f6d3e3e4 | 2886 | { |
f4f52cb5 | 2887 | uid_t rootuid, rootgid; |
f4f52cb5 CB |
2888 | int hostuid, hostgid, ret; |
2889 | struct stat sb; | |
2890 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
2891 | char ugid[100]; | |
41dc7155 | 2892 | const char *args1[] = {"lxc-usernsexec", |
f4f52cb5 CB |
2893 | "-m", map1, |
2894 | "-m", map2, | |
2895 | "-m", map3, | |
2896 | "-m", map5, | |
2897 | "--", "chown", ugid, path, | |
2898 | NULL}; | |
41dc7155 | 2899 | const char *args2[] = {"lxc-usernsexec", |
f4f52cb5 CB |
2900 | "-m", map1, |
2901 | "-m", map2, | |
2902 | "-m", map3, | |
2903 | "-m", map4, | |
2904 | "-m", map5, | |
2905 | "--", "chown", ugid, path, | |
2906 | NULL}; | |
6b5a54cd | 2907 | char cmd_output[PATH_MAX]; |
f4f52cb5 | 2908 | |
234998b4 CB |
2909 | rootuid = get_mapped_rootid(conf, ID_TYPE_UID); |
2910 | if (!uid_valid(rootuid)) | |
55022530 | 2911 | return log_error(-1, "No uid mapping for container root"); |
0fd73091 | 2912 | |
234998b4 CB |
2913 | rootgid = get_mapped_rootid(conf, ID_TYPE_GID); |
2914 | if (!gid_valid(rootgid)) | |
55022530 | 2915 | return log_error(-1, "No gid mapping for container root"); |
2a9a80cb | 2916 | |
234998b4 | 2917 | hostuid = geteuid(); |
f4f52cb5 | 2918 | if (hostuid == 0) { |
55022530 CB |
2919 | if (chown(path, rootuid, rootgid) < 0) |
2920 | return log_error(-1, "Error chowning %s", path); | |
0fd73091 | 2921 | |
c4d10a05 SH |
2922 | return 0; |
2923 | } | |
f3d7e4ca | 2924 | |
55022530 CB |
2925 | /* nothing to do */ |
2926 | if (rootuid == hostuid) | |
2927 | return log_info(0, "Container root is our uid; no need to chown"); | |
f3d7e4ca | 2928 | |
bbdbf8f0 | 2929 | /* save the current gid of "path" */ |
55022530 CB |
2930 | if (stat(path, &sb) < 0) |
2931 | return log_error(-1, "Error stat %s", path); | |
7b50c609 | 2932 | |
bbdbf8f0 CB |
2933 | /* Update the path argument in case this was overlayfs. */ |
2934 | args1[sizeof(args1) / sizeof(args1[0]) - 2] = path; | |
2935 | args2[sizeof(args2) / sizeof(args2[0]) - 2] = path; | |
2936 | ||
f4f52cb5 CB |
2937 | /* |
2938 | * A file has to be group-owned by a gid mapped into the | |
2939 | * container, or the container won't be privileged over it. | |
2940 | */ | |
234998b4 | 2941 | hostgid = getegid(); |
f4f52cb5 CB |
2942 | DEBUG("trying to chown \"%s\" to %d", path, hostgid); |
2943 | if (sb.st_uid == hostuid && | |
2944 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
55022530 CB |
2945 | chown(path, -1, hostgid) < 0) |
2946 | return log_error(-1, "Failed chgrping %s", path); | |
f6d3e3e4 | 2947 | |
1a0e70ac | 2948 | /* "u:0:rootuid:1" */ |
f4f52cb5 | 2949 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); |
55022530 CB |
2950 | if (ret < 0 || ret >= 100) |
2951 | return log_error(-1, "Error uid printing map string"); | |
7b50c609 | 2952 | |
1a0e70ac | 2953 | /* "u:hostuid:hostuid:1" */ |
f4f52cb5 | 2954 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); |
55022530 CB |
2955 | if (ret < 0 || ret >= 100) |
2956 | return log_error(-1, "Error uid printing map string"); | |
c4d10a05 | 2957 | |
1a0e70ac | 2958 | /* "g:0:rootgid:1" */ |
f4f52cb5 | 2959 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); |
55022530 CB |
2960 | if (ret < 0 || ret >= 100) |
2961 | return log_error(-1, "Error gid printing map string"); | |
98e5ba51 | 2962 | |
1a0e70ac | 2963 | /* "g:pathgid:rootgid+pathgid:1" */ |
f4f52cb5 CB |
2964 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, |
2965 | rootgid + (gid_t)sb.st_gid); | |
55022530 CB |
2966 | if (ret < 0 || ret >= 100) |
2967 | return log_error(-1, "Error gid printing map string"); | |
c4d10a05 | 2968 | |
1a0e70ac | 2969 | /* "g:hostgid:hostgid:1" */ |
f4f52cb5 | 2970 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); |
55022530 CB |
2971 | if (ret < 0 || ret >= 100) |
2972 | return log_error(-1, "Error gid printing map string"); | |
7b50c609 | 2973 | |
1a0e70ac | 2974 | /* "0:pathgid" (chown) */ |
f4f52cb5 | 2975 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); |
55022530 CB |
2976 | if (ret < 0 || ret >= 100) |
2977 | return log_error(-1, "Error owner printing format string for chown"); | |
7b50c609 | 2978 | |
f4f52cb5 CB |
2979 | if (hostgid == sb.st_gid) |
2980 | ret = run_command(cmd_output, sizeof(cmd_output), | |
2981 | chown_mapped_root_exec_wrapper, | |
2982 | (void *)args1); | |
2983 | else | |
2984 | ret = run_command(cmd_output, sizeof(cmd_output), | |
2985 | chown_mapped_root_exec_wrapper, | |
2986 | (void *)args2); | |
2987 | if (ret < 0) | |
2988 | ERROR("lxc-usernsexec failed: %s", cmd_output); | |
7b50c609 | 2989 | |
f4f52cb5 | 2990 | return ret; |
f6d3e3e4 SH |
2991 | } |
2992 | ||
943144d9 CB |
2993 | /* NOTE: Must not be called from inside the container namespace! */ |
2994 | int lxc_create_tmp_proc_mount(struct lxc_conf *conf) | |
5112cd70 SH |
2995 | { |
2996 | int mounted; | |
2997 | ||
943144d9 | 2998 | mounted = lxc_mount_proc_if_needed(conf->rootfs.path ? conf->rootfs.mount : ""); |
5112cd70 | 2999 | if (mounted == -1) { |
0fd73091 | 3000 | SYSERROR("Failed to mount proc in the container"); |
01958b1f | 3001 | /* continue only if there is no rootfs */ |
943144d9 | 3002 | if (conf->rootfs.path) |
01958b1f | 3003 | return -1; |
5112cd70 | 3004 | } else if (mounted == 1) { |
7a0bcca3 | 3005 | conf->tmp_umount_proc = true; |
5112cd70 | 3006 | } |
943144d9 | 3007 | |
5112cd70 SH |
3008 | return 0; |
3009 | } | |
3010 | ||
3011 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3012 | { | |
7a0bcca3 | 3013 | if (!lxc_conf->tmp_umount_proc) |
0fd73091 CB |
3014 | return; |
3015 | ||
7a0bcca3 CB |
3016 | (void)umount2("/proc", MNT_DETACH); |
3017 | lxc_conf->tmp_umount_proc = false; | |
5112cd70 SH |
3018 | } |
3019 | ||
0fd73091 | 3020 | /* Walk /proc/mounts and change any shared entries to slave. */ |
6a0c909a | 3021 | void remount_all_slave(void) |
e995d7a2 | 3022 | { |
7969675f | 3023 | __do_free char *line = NULL; |
003be47b | 3024 | __do_fclose FILE *f = NULL; |
f62cf1d4 | 3025 | __do_close int memfd = -EBADF, mntinfo_fd = -EBADF; |
003be47b | 3026 | int ret; |
6a49f05e | 3027 | ssize_t copied; |
e995d7a2 SH |
3028 | size_t len = 0; |
3029 | ||
6a49f05e | 3030 | mntinfo_fd = open("/proc/self/mountinfo", O_RDONLY | O_CLOEXEC); |
fea3b91d DJ |
3031 | if (mntinfo_fd < 0) { |
3032 | SYSERROR("Failed to open \"/proc/self/mountinfo\""); | |
6a49f05e | 3033 | return; |
fea3b91d | 3034 | } |
6a49f05e CB |
3035 | |
3036 | memfd = memfd_create(".lxc_mountinfo", MFD_CLOEXEC); | |
3037 | if (memfd < 0) { | |
3038 | char template[] = P_tmpdir "/.lxc_mountinfo_XXXXXX"; | |
3039 | ||
3040 | if (errno != ENOSYS) { | |
fea3b91d | 3041 | SYSERROR("Failed to create temporary in-memory file"); |
6a49f05e CB |
3042 | return; |
3043 | } | |
3044 | ||
3045 | memfd = lxc_make_tmpfile(template, true); | |
fea3b91d | 3046 | if (memfd < 0) { |
fea3b91d DJ |
3047 | WARN("Failed to create temporary file"); |
3048 | return; | |
3049 | } | |
6a49f05e CB |
3050 | } |
3051 | ||
6a49f05e | 3052 | again: |
7c4d9466 | 3053 | copied = lxc_sendfile_nointr(memfd, mntinfo_fd, NULL, LXC_SENDFILE_MAX); |
6a49f05e CB |
3054 | if (copied < 0) { |
3055 | if (errno == EINTR) | |
3056 | goto again; | |
3057 | ||
fea3b91d | 3058 | SYSERROR("Failed to copy \"/proc/self/mountinfo\""); |
6a49f05e CB |
3059 | return; |
3060 | } | |
6a49f05e | 3061 | |
6a49f05e CB |
3062 | ret = lseek(memfd, 0, SEEK_SET); |
3063 | if (ret < 0) { | |
fea3b91d | 3064 | SYSERROR("Failed to reset file descriptor offset"); |
6a49f05e CB |
3065 | return; |
3066 | } | |
3067 | ||
4110345b | 3068 | f = fdopen(memfd, "re"); |
e995d7a2 | 3069 | if (!f) { |
003be47b | 3070 | SYSERROR("Failed to open copy of \"/proc/self/mountinfo\" to mark all shared. Continuing"); |
e995d7a2 SH |
3071 | return; |
3072 | } | |
3073 | ||
003be47b CB |
3074 | /* |
3075 | * After a successful fdopen() memfd will be closed when calling | |
3076 | * fclose(f). Calling close(memfd) afterwards is undefined. | |
3077 | */ | |
3078 | move_fd(memfd); | |
3079 | ||
e995d7a2 | 3080 | while (getline(&line, &len, f) != -1) { |
0fd73091 CB |
3081 | char *opts, *target; |
3082 | ||
e995d7a2 SH |
3083 | target = get_field(line, 4); |
3084 | if (!target) | |
3085 | continue; | |
0fd73091 | 3086 | |
e995d7a2 SH |
3087 | opts = get_field(target, 2); |
3088 | if (!opts) | |
3089 | continue; | |
0fd73091 | 3090 | |
e995d7a2 SH |
3091 | null_endofword(opts); |
3092 | if (!strstr(opts, "shared")) | |
3093 | continue; | |
0fd73091 | 3094 | |
e995d7a2 | 3095 | null_endofword(target); |
0fd73091 CB |
3096 | ret = mount(NULL, target, NULL, MS_SLAVE, NULL); |
3097 | if (ret < 0) { | |
3098 | SYSERROR("Failed to make \"%s\" MS_SLAVE", target); | |
e995d7a2 | 3099 | ERROR("Continuing..."); |
6a49f05e | 3100 | continue; |
e995d7a2 | 3101 | } |
6a49f05e | 3102 | TRACE("Remounted \"%s\" as MS_SLAVE", target); |
e995d7a2 | 3103 | } |
6a49f05e | 3104 | TRACE("Remounted all mount table entries as MS_SLAVE"); |
e995d7a2 SH |
3105 | } |
3106 | ||
794248d0 | 3107 | static int lxc_execute_bind_init(struct lxc_handler *handler) |
2322903b SH |
3108 | { |
3109 | int ret; | |
794248d0 CB |
3110 | char *p; |
3111 | char path[PATH_MAX], destpath[PATH_MAX]; | |
3112 | struct lxc_conf *conf = handler->conf; | |
9d9c111c SH |
3113 | |
3114 | /* If init exists in the container, don't bind mount a static one */ | |
3115 | p = choose_init(conf->rootfs.mount); | |
3116 | if (p) { | |
22f835ba | 3117 | __do_free char *old = p; |
41089848 TA |
3118 | |
3119 | p = strdup(old + strlen(conf->rootfs.mount)); | |
41089848 TA |
3120 | if (!p) |
3121 | return -ENOMEM; | |
3122 | ||
3123 | INFO("Found existing init at \"%s\"", p); | |
3124 | goto out; | |
9d9c111c | 3125 | } |
2322903b SH |
3126 | |
3127 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
0fd73091 | 3128 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3129 | return -1; |
2322903b | 3130 | |
55022530 CB |
3131 | if (!file_exists(path)) |
3132 | return log_error_errno(-1, errno, "The file \"%s\" does not exist on host", path); | |
2322903b | 3133 | |
794248d0 | 3134 | ret = snprintf(destpath, PATH_MAX, "%s" P_tmpdir "%s", conf->rootfs.mount, "/.lxc-init"); |
0fd73091 | 3135 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3136 | return -1; |
2322903b SH |
3137 | |
3138 | if (!file_exists(destpath)) { | |
794248d0 | 3139 | ret = mknod(destpath, S_IFREG | 0000, 0); |
55022530 CB |
3140 | if (ret < 0 && errno != EEXIST) |
3141 | return log_error_errno(-1, errno, "Failed to create dummy \"%s\" file as bind mount target", destpath); | |
2322903b SH |
3142 | } |
3143 | ||
592fd47a | 3144 | ret = safe_mount(path, destpath, "none", MS_BIND, NULL, conf->rootfs.mount); |
55022530 CB |
3145 | if (ret < 0) |
3146 | return log_error_errno(-1, errno, "Failed to bind mount lxc.init.static into container"); | |
8353b4c9 | 3147 | |
794248d0 CB |
3148 | p = strdup(destpath + strlen(conf->rootfs.mount)); |
3149 | if (!p) | |
3150 | return -ENOMEM; | |
794248d0 | 3151 | |
8353b4c9 | 3152 | INFO("Bind mounted lxc.init.static into container at \"%s\"", path); |
41089848 | 3153 | out: |
4b5b3a2a | 3154 | ((struct execute_args *)handler->data)->init_fd = -1; |
41089848 | 3155 | ((struct execute_args *)handler->data)->init_path = p; |
8353b4c9 | 3156 | return 0; |
2322903b SH |
3157 | } |
3158 | ||
0fd73091 CB |
3159 | /* This does the work of remounting / if it is shared, calling the container |
3160 | * pre-mount hooks, and mounting the rootfs. | |
35120d9c | 3161 | */ |
8ce1abc2 CB |
3162 | int lxc_setup_rootfs_prepare_root(struct lxc_conf *conf, const char *name, |
3163 | const char *lxcpath) | |
0ad19a3f | 3164 | { |
0fd73091 CB |
3165 | int ret; |
3166 | ||
35120d9c | 3167 | if (conf->rootfs_setup) { |
35120d9c | 3168 | const char *path = conf->rootfs.mount; |
0fd73091 CB |
3169 | |
3170 | /* The rootfs was set up in another namespace. bind-mount it to | |
3171 | * give us a mount in our own ns so we can pivot_root to it | |
3172 | */ | |
3173 | ret = mount(path, path, "rootfs", MS_BIND, NULL); | |
55022530 CB |
3174 | if (ret < 0) |
3175 | return log_error(-1, "Failed to bind mount container / onto itself"); | |
0fd73091 | 3176 | |
55022530 | 3177 | return log_trace(0, "Bind mounted container / onto itself"); |
35120d9c | 3178 | } |
d4ef7c50 | 3179 | |
e995d7a2 SH |
3180 | remount_all_slave(); |
3181 | ||
0fd73091 | 3182 | ret = run_lxc_hooks(name, "pre-mount", conf, NULL); |
55022530 CB |
3183 | if (ret < 0) |
3184 | return log_error(-1, "Failed to run pre-mount hooks"); | |
35120d9c | 3185 | |
8ce1abc2 | 3186 | ret = lxc_mount_rootfs(conf); |
55022530 CB |
3187 | if (ret < 0) |
3188 | return log_error(-1, "Failed to setup rootfs for"); | |
35120d9c SH |
3189 | |
3190 | conf->rootfs_setup = true; | |
3191 | return 0; | |
3192 | } | |
3193 | ||
1c1c7051 SH |
3194 | static bool verify_start_hooks(struct lxc_conf *conf) |
3195 | { | |
6b5a54cd | 3196 | char path[PATH_MAX]; |
0fd73091 CB |
3197 | struct lxc_list *it; |
3198 | ||
3199 | lxc_list_for_each (it, &conf->hooks[LXCHOOK_START]) { | |
1c1c7051 | 3200 | int ret; |
0fd73091 | 3201 | char *hookname = it->elem; |
1c1c7051 | 3202 | |
6b5a54cd | 3203 | ret = snprintf(path, PATH_MAX, "%s%s", |
0fd73091 CB |
3204 | conf->rootfs.path ? conf->rootfs.mount : "", |
3205 | hookname); | |
6b5a54cd | 3206 | if (ret < 0 || ret >= PATH_MAX) |
1c1c7051 | 3207 | return false; |
0fd73091 | 3208 | |
75193660 | 3209 | ret = access(path, X_OK); |
55022530 CB |
3210 | if (ret < 0) |
3211 | return log_error_errno(false, errno, "Start hook \"%s\" not found in container", hookname); | |
0fd73091 | 3212 | |
6a0c909a | 3213 | return true; |
1c1c7051 SH |
3214 | } |
3215 | ||
3216 | return true; | |
3217 | } | |
3218 | ||
4b5b3a2a TA |
3219 | static bool execveat_supported(void) |
3220 | { | |
13be2733 | 3221 | lxc_raw_execveat(-1, "", NULL, NULL, AT_EMPTY_PATH); |
4b5b3a2a TA |
3222 | if (errno == ENOSYS) |
3223 | return false; | |
3224 | ||
3225 | return true; | |
4b5b3a2a TA |
3226 | } |
3227 | ||
20502652 CB |
3228 | static int lxc_setup_boot_id(void) |
3229 | { | |
3230 | int ret; | |
3231 | const char *boot_id_path = "/proc/sys/kernel/random/boot_id"; | |
3232 | const char *mock_boot_id_path = "/dev/.lxc-boot-id"; | |
3233 | lxc_id128_t n; | |
3234 | ||
3235 | if (access(boot_id_path, F_OK)) | |
3236 | return 0; | |
3237 | ||
3238 | memset(&n, 0, sizeof(n)); | |
3239 | if (lxc_id128_randomize(&n)) { | |
3240 | SYSERROR("Failed to generate random data for uuid"); | |
3241 | return -1; | |
3242 | } | |
3243 | ||
3244 | ret = lxc_id128_write(mock_boot_id_path, n); | |
3245 | if (ret < 0) { | |
3246 | SYSERROR("Failed to write uuid to %s", mock_boot_id_path); | |
3247 | return -1; | |
3248 | } | |
3249 | ||
3250 | ret = chmod(mock_boot_id_path, 0444); | |
3251 | if (ret < 0) { | |
3252 | SYSERROR("Failed to chown %s", mock_boot_id_path); | |
3253 | (void)unlink(mock_boot_id_path); | |
3254 | return -1; | |
3255 | } | |
3256 | ||
3257 | ret = mount(mock_boot_id_path, boot_id_path, NULL, MS_BIND, NULL); | |
3258 | if (ret < 0) { | |
3259 | SYSERROR("Failed to mount %s to %s", mock_boot_id_path, | |
3260 | boot_id_path); | |
3261 | (void)unlink(mock_boot_id_path); | |
3262 | return -1; | |
3263 | } | |
3264 | ||
3265 | ret = mount(NULL, boot_id_path, NULL, | |
3266 | (MS_BIND | MS_REMOUNT | MS_RDONLY | MS_NOSUID | MS_NOEXEC | | |
3267 | MS_NODEV), | |
3268 | NULL); | |
3269 | if (ret < 0) { | |
3270 | SYSERROR("Failed to remount %s read-only", boot_id_path); | |
3271 | (void)unlink(mock_boot_id_path); | |
3272 | return -1; | |
3273 | } | |
3274 | ||
3275 | return 0; | |
3276 | } | |
3277 | ||
3b988b33 | 3278 | int lxc_setup(struct lxc_handler *handler) |
35120d9c | 3279 | { |
cf68ffd9 | 3280 | __do_close int pts_mnt_fd = -EBADF; |
2187efd3 | 3281 | int ret; |
0fd73091 | 3282 | const char *lxcpath = handler->lxcpath, *name = handler->name; |
35120d9c | 3283 | struct lxc_conf *lxc_conf = handler->conf; |
4fef78bc | 3284 | char *keyring_context = NULL; |
35120d9c | 3285 | |
8ce1abc2 | 3286 | ret = lxc_setup_rootfs_prepare_root(lxc_conf, name, lxcpath); |
55022530 CB |
3287 | if (ret < 0) |
3288 | return log_error(-1, "Failed to setup rootfs"); | |
35120d9c | 3289 | |
b87ee312 | 3290 | if (handler->nsfd[LXC_NS_UTS] == -EBADF) { |
8353b4c9 | 3291 | ret = setup_utsname(lxc_conf->utsname); |
55022530 CB |
3292 | if (ret < 0) |
3293 | return log_error(-1, "Failed to setup the utsname %s", name); | |
0ad19a3f | 3294 | } |
3295 | ||
8f818a84 MB |
3296 | if (!lxc_conf->keyring_disable_session) { |
3297 | if (lxc_conf->lsm_se_keyring_context) { | |
3298 | keyring_context = lxc_conf->lsm_se_keyring_context; | |
3299 | } else if (lxc_conf->lsm_se_context) { | |
3300 | keyring_context = lxc_conf->lsm_se_context; | |
3301 | } | |
4fef78bc | 3302 | |
8f818a84 MB |
3303 | ret = lxc_setup_keyring(keyring_context); |
3304 | if (ret < 0) | |
3305 | return -1; | |
3306 | } | |
b25291da | 3307 | |
e389f2af CB |
3308 | if (handler->ns_clone_flags & CLONE_NEWNET) { |
3309 | ret = lxc_setup_network_in_child_namespaces(lxc_conf, | |
3310 | &lxc_conf->network); | |
55022530 CB |
3311 | if (ret < 0) |
3312 | return log_error(-1, "Failed to setup network"); | |
0ad19a3f | 3313 | |
e389f2af | 3314 | ret = lxc_network_send_name_and_ifindex_to_parent(handler); |
55022530 CB |
3315 | if (ret < 0) |
3316 | return log_error(-1, "Failed to send network device names and ifindices to parent"); | |
790255cf CB |
3317 | } |
3318 | ||
cf68ffd9 CB |
3319 | pts_mnt_fd = open_tree(-EBADF, lxc_conf->console.name, |
3320 | OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC | AT_EMPTY_PATH); | |
3321 | if (pts_mnt_fd < 0) | |
3322 | SYSTRACE("Failed to create detached mount for container's console \"%s\"", | |
3323 | lxc_conf->console.name); | |
3324 | ||
bc6928ff | 3325 | if (lxc_conf->autodev > 0) { |
63012bdd | 3326 | ret = mount_autodev(name, &lxc_conf->rootfs, lxc_conf->autodevtmpfssize, lxcpath); |
55022530 CB |
3327 | if (ret < 0) |
3328 | return log_error(-1, "Failed to mount \"/dev\""); | |
c6883f38 SH |
3329 | } |
3330 | ||
8353b4c9 CB |
3331 | /* Do automatic mounts (mainly /proc and /sys), but exclude those that |
3332 | * need to wait until other stuff has finished. | |
368bbc02 | 3333 | */ |
8353b4c9 | 3334 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler); |
55022530 CB |
3335 | if (ret < 0) |
3336 | return log_error(-1, "Failed to setup first automatic mounts"); | |
368bbc02 | 3337 | |
8353b4c9 | 3338 | ret = setup_mount(lxc_conf, &lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath); |
55022530 CB |
3339 | if (ret < 0) |
3340 | return log_error(-1, "Failed to setup mounts"); | |
576f946d | 3341 | |
c631115d FA |
3342 | if (!lxc_list_empty(&lxc_conf->mount_list)) { |
3343 | ret = setup_mount_entries(lxc_conf, &lxc_conf->rootfs, | |
3344 | &lxc_conf->mount_list, name, lxcpath); | |
55022530 CB |
3345 | if (ret < 0) |
3346 | return log_error(-1, "Failed to setup mount entries"); | |
c631115d FA |
3347 | } |
3348 | ||
8353b4c9 | 3349 | if (lxc_conf->is_execute) { |
4b5b3a2a TA |
3350 | if (execveat_supported()) { |
3351 | int fd; | |
3352 | char path[PATH_MAX]; | |
3353 | ||
3354 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
55022530 CB |
3355 | if (ret < 0 || ret >= PATH_MAX) |
3356 | return log_error(-1, "Path to init.lxc.static too long"); | |
4b5b3a2a TA |
3357 | |
3358 | fd = open(path, O_PATH | O_CLOEXEC); | |
55022530 CB |
3359 | if (fd < 0) |
3360 | return log_error_errno(-1, errno, "Unable to open lxc.init.static"); | |
4b5b3a2a TA |
3361 | |
3362 | ((struct execute_args *)handler->data)->init_fd = fd; | |
3363 | ((struct execute_args *)handler->data)->init_path = NULL; | |
3364 | } else { | |
3365 | ret = lxc_execute_bind_init(handler); | |
55022530 CB |
3366 | if (ret < 0) |
3367 | return log_error(-1, "Failed to bind-mount the lxc init system"); | |
8353b4c9 CB |
3368 | } |
3369 | } | |
2322903b | 3370 | |
8353b4c9 CB |
3371 | /* Now mount only cgroups, if wanted. Before, /sys could not have been |
3372 | * mounted. It is guaranteed to be mounted now either through | |
3373 | * automatically or via fstab entries. | |
368bbc02 | 3374 | */ |
8353b4c9 | 3375 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler); |
55022530 CB |
3376 | if (ret < 0) |
3377 | return log_error(-1, "Failed to setup remaining automatic mounts"); | |
368bbc02 | 3378 | |
8353b4c9 | 3379 | ret = run_lxc_hooks(name, "mount", lxc_conf, NULL); |
55022530 CB |
3380 | if (ret < 0) |
3381 | return log_error(-1, "Failed to run mount hooks"); | |
773fb9ca | 3382 | |
bc6928ff | 3383 | if (lxc_conf->autodev > 0) { |
8353b4c9 | 3384 | ret = run_lxc_hooks(name, "autodev", lxc_conf, NULL); |
55022530 CB |
3385 | if (ret < 0) |
3386 | return log_error(-1, "Failed to run autodev hooks"); | |
06749971 | 3387 | |
8353b4c9 | 3388 | ret = lxc_fill_autodev(&lxc_conf->rootfs); |
55022530 CB |
3389 | if (ret < 0) |
3390 | return log_error(-1, "Failed to populate \"/dev\""); | |
91c3830e | 3391 | } |
368bbc02 | 3392 | |
75193660 | 3393 | /* Make sure any start hooks are in the container */ |
55022530 CB |
3394 | if (!verify_start_hooks(lxc_conf)) |
3395 | return log_error(-1, "Failed to verify start hooks"); | |
75193660 | 3396 | |
cf68ffd9 CB |
3397 | ret = lxc_create_tmp_proc_mount(lxc_conf); |
3398 | if (ret < 0) | |
3399 | return log_error(-1, "Failed to \"/proc\" LSMs"); | |
3400 | ||
ed8704d0 | 3401 | ret = lxc_setup_console(&lxc_conf->rootfs, &lxc_conf->console, |
cf68ffd9 | 3402 | lxc_conf->ttys.dir, pts_mnt_fd); |
55022530 CB |
3403 | if (ret < 0) |
3404 | return log_error(-1, "Failed to setup console"); | |
6e590161 | 3405 | |
ed8704d0 | 3406 | ret = lxc_setup_dev_symlinks(&lxc_conf->rootfs); |
55022530 CB |
3407 | if (ret < 0) |
3408 | return log_error(-1, "Failed to setup \"/dev\" symlinks"); | |
69aa6655 | 3409 | |
8ce1abc2 | 3410 | ret = lxc_setup_rootfs_switch_root(&lxc_conf->rootfs); |
55022530 CB |
3411 | if (ret < 0) |
3412 | return log_error(-1, "Failed to pivot root into rootfs"); | |
ed502555 | 3413 | |
20502652 CB |
3414 | /* Setting the boot-id is best-effort for now. */ |
3415 | if (lxc_conf->autodev > 0) | |
3416 | (void)lxc_setup_boot_id(); | |
3417 | ||
8353b4c9 | 3418 | ret = lxc_setup_devpts(lxc_conf); |
55022530 CB |
3419 | if (ret < 0) |
3420 | return log_error(-1, "Failed to setup new devpts instance"); | |
3c26f34e | 3421 | |
2187efd3 CB |
3422 | ret = lxc_create_ttys(handler); |
3423 | if (ret < 0) | |
e8bd4e43 | 3424 | return -1; |
e8bd4e43 | 3425 | |
8353b4c9 | 3426 | ret = setup_personality(lxc_conf->personality); |
55022530 CB |
3427 | if (ret < 0) |
3428 | return log_error(-1, "Failed to set personality"); | |
cccc74b5 | 3429 | |
8353b4c9 CB |
3430 | /* Set sysctl value to a path under /proc/sys as determined from the |
3431 | * key. For e.g. net.ipv4.ip_forward translated to | |
3432 | * /proc/sys/net/ipv4/ip_forward. | |
7edd0540 L |
3433 | */ |
3434 | if (!lxc_list_empty(&lxc_conf->sysctls)) { | |
3435 | ret = setup_sysctl_parameters(&lxc_conf->sysctls); | |
55022530 CB |
3436 | if (ret < 0) |
3437 | return log_error(-1, "Failed to setup sysctl parameters"); | |
7edd0540 L |
3438 | } |
3439 | ||
97a8f74f | 3440 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
55022530 CB |
3441 | if (!lxc_list_empty(&lxc_conf->caps)) |
3442 | return log_error(-1, "Container requests lxc.cap.drop and lxc.cap.keep: either use lxc.cap.drop or lxc.cap.keep, not both"); | |
8353b4c9 | 3443 | |
55022530 CB |
3444 | if (dropcaps_except(&lxc_conf->keepcaps)) |
3445 | return log_error(-1, "Failed to keep capabilities"); | |
97a8f74f | 3446 | } else if (setup_caps(&lxc_conf->caps)) { |
55022530 | 3447 | return log_error(-1, "Failed to drop capabilities"); |
81810dd1 DL |
3448 | } |
3449 | ||
8353b4c9 | 3450 | NOTICE("The container \"%s\" is set up", name); |
cd54d859 | 3451 | |
0ad19a3f | 3452 | return 0; |
3453 | } | |
26ddeedd | 3454 | |
3f60c2f7 | 3455 | int run_lxc_hooks(const char *name, char *hookname, struct lxc_conf *conf, |
14a7b0f9 | 3456 | char *argv[]) |
26ddeedd | 3457 | { |
26ddeedd | 3458 | struct lxc_list *it; |
3ea957c6 RK |
3459 | int which; |
3460 | ||
3461 | for (which = 0; which < NUM_LXC_HOOKS; which ++) { | |
3462 | if (strcmp(hookname, lxchook_names[which]) == 0) | |
3463 | break; | |
3464 | } | |
3465 | ||
3466 | if (which >= NUM_LXC_HOOKS) | |
26ddeedd | 3467 | return -1; |
3f60c2f7 | 3468 | |
0fd73091 | 3469 | lxc_list_for_each (it, &conf->hooks[which]) { |
26ddeedd | 3470 | int ret; |
3f60c2f7 CB |
3471 | char *hook = it->elem; |
3472 | ||
3473 | ret = run_script_argv(name, conf->hooks_version, "lxc", hook, | |
14a7b0f9 | 3474 | hookname, argv); |
3f60c2f7 CB |
3475 | if (ret < 0) |
3476 | return -1; | |
26ddeedd | 3477 | } |
3f60c2f7 | 3478 | |
26ddeedd SH |
3479 | return 0; |
3480 | } | |
72d0e1cb | 3481 | |
72d0e1cb SG |
3482 | int lxc_clear_config_caps(struct lxc_conf *c) |
3483 | { | |
1a0e70ac | 3484 | struct lxc_list *it, *next; |
72d0e1cb | 3485 | |
0fd73091 | 3486 | lxc_list_for_each_safe (it, &c->caps, next) { |
72d0e1cb SG |
3487 | lxc_list_del(it); |
3488 | free(it->elem); | |
3489 | free(it); | |
3490 | } | |
0fd73091 | 3491 | |
72d0e1cb SG |
3492 | return 0; |
3493 | } | |
3494 | ||
c7e345ae CB |
3495 | static int lxc_free_idmap(struct lxc_list *id_map) |
3496 | { | |
27c27d73 SH |
3497 | struct lxc_list *it, *next; |
3498 | ||
46bc6f2a | 3499 | lxc_list_for_each_safe(it, id_map, next) { |
27c27d73 SH |
3500 | lxc_list_del(it); |
3501 | free(it->elem); | |
3502 | free(it); | |
3503 | } | |
c7e345ae | 3504 | |
27c27d73 SH |
3505 | return 0; |
3506 | } | |
766c5b6d | 3507 | define_cleanup_function(struct lxc_list *, lxc_free_idmap); |
27c27d73 | 3508 | |
4355ab5f SH |
3509 | int lxc_clear_idmaps(struct lxc_conf *c) |
3510 | { | |
3511 | return lxc_free_idmap(&c->id_map); | |
3512 | } | |
3513 | ||
1fb86a7c SH |
3514 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
3515 | { | |
0fd73091 | 3516 | struct lxc_list *it, *next; |
1fb86a7c | 3517 | |
0fd73091 | 3518 | lxc_list_for_each_safe (it, &c->keepcaps, next) { |
1fb86a7c SH |
3519 | lxc_list_del(it); |
3520 | free(it->elem); | |
3521 | free(it); | |
3522 | } | |
0fd73091 | 3523 | |
1fb86a7c SH |
3524 | return 0; |
3525 | } | |
3526 | ||
a3ed9b81 | 3527 | int lxc_clear_namespace(struct lxc_conf *c) |
3528 | { | |
3529 | int i; | |
3530 | for (i = 0; i < LXC_NS_MAX; i++) { | |
3531 | free(c->ns_share[i]); | |
3532 | c->ns_share[i] = NULL; | |
3533 | } | |
3534 | return 0; | |
3535 | } | |
3536 | ||
54860ed0 | 3537 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version) |
72d0e1cb | 3538 | { |
54860ed0 | 3539 | char *global_token, *namespaced_token; |
ab1a6cac | 3540 | size_t namespaced_token_len; |
54860ed0 | 3541 | struct lxc_list *it, *next, *list; |
ab1a6cac | 3542 | const char *k = key; |
54860ed0 | 3543 | bool all = false; |
72d0e1cb | 3544 | |
54860ed0 CB |
3545 | if (version == CGROUP2_SUPER_MAGIC) { |
3546 | global_token = "lxc.cgroup2"; | |
3547 | namespaced_token = "lxc.cgroup2."; | |
6333c915 | 3548 | namespaced_token_len = STRLITERALLEN("lxc.cgroup2."); |
54860ed0 CB |
3549 | list = &c->cgroup2; |
3550 | } else if (version == CGROUP_SUPER_MAGIC) { | |
3551 | global_token = "lxc.cgroup"; | |
3552 | namespaced_token = "lxc.cgroup."; | |
6333c915 | 3553 | namespaced_token_len = STRLITERALLEN("lxc.cgroup."); |
54860ed0 CB |
3554 | list = &c->cgroup; |
3555 | } else { | |
ab1a6cac | 3556 | return -EINVAL; |
54860ed0 CB |
3557 | } |
3558 | ||
3559 | if (strcmp(key, global_token) == 0) | |
72d0e1cb | 3560 | all = true; |
6333c915 | 3561 | else if (strncmp(key, namespaced_token, namespaced_token_len) == 0) |
ab1a6cac | 3562 | k += namespaced_token_len; |
a6390f01 | 3563 | else |
ab1a6cac | 3564 | return -EINVAL; |
72d0e1cb | 3565 | |
0fd73091 | 3566 | lxc_list_for_each_safe (it, list, next) { |
72d0e1cb | 3567 | struct lxc_cgroup *cg = it->elem; |
54860ed0 | 3568 | |
72d0e1cb SG |
3569 | if (!all && strcmp(cg->subsystem, k) != 0) |
3570 | continue; | |
54860ed0 | 3571 | |
72d0e1cb SG |
3572 | lxc_list_del(it); |
3573 | free(cg->subsystem); | |
3574 | free(cg->value); | |
3575 | free(cg); | |
3576 | free(it); | |
3577 | } | |
e409b214 | 3578 | |
72d0e1cb SG |
3579 | return 0; |
3580 | } | |
3581 | ||
4bfb655e CB |
3582 | static void lxc_clear_devices(struct lxc_conf *conf) |
3583 | { | |
3584 | struct lxc_list *list = &conf->devices; | |
3585 | struct lxc_list *it, *next; | |
3586 | ||
3587 | lxc_list_for_each_safe(it, list, next) { | |
3588 | lxc_list_del(it); | |
3589 | free(it); | |
3590 | } | |
3591 | } | |
3592 | ||
c6d09e15 WB |
3593 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
3594 | { | |
3595 | struct lxc_list *it, *next; | |
c6d09e15 | 3596 | const char *k = NULL; |
0fd73091 | 3597 | bool all = false; |
c6d09e15 | 3598 | |
b668653c | 3599 | if (strcmp(key, "lxc.limit") == 0 || strcmp(key, "lxc.prlimit") == 0) |
c6d09e15 | 3600 | all = true; |
6333c915 CB |
3601 | else if (strncmp(key, "lxc.limit.", STRLITERALLEN("lxc.limit.")) == 0) |
3602 | k = key + STRLITERALLEN("lxc.limit."); | |
3603 | else if (strncmp(key, "lxc.prlimit.", STRLITERALLEN("lxc.prlimit.")) == 0) | |
3604 | k = key + STRLITERALLEN("lxc.prlimit."); | |
c6d09e15 WB |
3605 | else |
3606 | return -1; | |
3607 | ||
0fd73091 | 3608 | lxc_list_for_each_safe (it, &c->limits, next) { |
c6d09e15 | 3609 | struct lxc_limit *lim = it->elem; |
0fd73091 | 3610 | |
c6d09e15 WB |
3611 | if (!all && strcmp(lim->resource, k) != 0) |
3612 | continue; | |
0fd73091 | 3613 | |
c6d09e15 WB |
3614 | lxc_list_del(it); |
3615 | free(lim->resource); | |
3616 | free(lim); | |
3617 | free(it); | |
3618 | } | |
b668653c | 3619 | |
c6d09e15 WB |
3620 | return 0; |
3621 | } | |
3622 | ||
7edd0540 L |
3623 | int lxc_clear_sysctls(struct lxc_conf *c, const char *key) |
3624 | { | |
3625 | struct lxc_list *it, *next; | |
7edd0540 | 3626 | const char *k = NULL; |
0fd73091 | 3627 | bool all = false; |
7edd0540 L |
3628 | |
3629 | if (strcmp(key, "lxc.sysctl") == 0) | |
3630 | all = true; | |
6333c915 CB |
3631 | else if (strncmp(key, "lxc.sysctl.", STRLITERALLEN("lxc.sysctl.")) == 0) |
3632 | k = key + STRLITERALLEN("lxc.sysctl."); | |
7edd0540 L |
3633 | else |
3634 | return -1; | |
3635 | ||
0fd73091 | 3636 | lxc_list_for_each_safe (it, &c->sysctls, next) { |
7edd0540 | 3637 | struct lxc_sysctl *elem = it->elem; |
0fd73091 | 3638 | |
7edd0540 L |
3639 | if (!all && strcmp(elem->key, k) != 0) |
3640 | continue; | |
0fd73091 | 3641 | |
7edd0540 L |
3642 | lxc_list_del(it); |
3643 | free(elem->key); | |
3644 | free(elem->value); | |
3645 | free(elem); | |
3646 | free(it); | |
3647 | } | |
0fd73091 | 3648 | |
7edd0540 L |
3649 | return 0; |
3650 | } | |
3651 | ||
61d7a733 YT |
3652 | int lxc_clear_procs(struct lxc_conf *c, const char *key) |
3653 | { | |
0fd73091 | 3654 | struct lxc_list *it, *next; |
61d7a733 | 3655 | const char *k = NULL; |
0fd73091 | 3656 | bool all = false; |
61d7a733 YT |
3657 | |
3658 | if (strcmp(key, "lxc.proc") == 0) | |
3659 | all = true; | |
6333c915 CB |
3660 | else if (strncmp(key, "lxc.proc.", STRLITERALLEN("lxc.proc.")) == 0) |
3661 | k = key + STRLITERALLEN("lxc.proc."); | |
61d7a733 YT |
3662 | else |
3663 | return -1; | |
3664 | ||
0fd73091 | 3665 | lxc_list_for_each_safe (it, &c->procs, next) { |
61d7a733 | 3666 | struct lxc_proc *proc = it->elem; |
0fd73091 | 3667 | |
61d7a733 YT |
3668 | if (!all && strcmp(proc->filename, k) != 0) |
3669 | continue; | |
0fd73091 | 3670 | |
61d7a733 YT |
3671 | lxc_list_del(it); |
3672 | free(proc->filename); | |
3673 | free(proc->value); | |
3674 | free(proc); | |
3675 | free(it); | |
3676 | } | |
3677 | ||
3678 | return 0; | |
3679 | } | |
3680 | ||
ee1e7aa0 SG |
3681 | int lxc_clear_groups(struct lxc_conf *c) |
3682 | { | |
0fd73091 | 3683 | struct lxc_list *it, *next; |
ee1e7aa0 | 3684 | |
0fd73091 | 3685 | lxc_list_for_each_safe (it, &c->groups, next) { |
ee1e7aa0 SG |
3686 | lxc_list_del(it); |
3687 | free(it->elem); | |
3688 | free(it); | |
3689 | } | |
0fd73091 | 3690 | |
ee1e7aa0 SG |
3691 | return 0; |
3692 | } | |
3693 | ||
ab799c0b SG |
3694 | int lxc_clear_environment(struct lxc_conf *c) |
3695 | { | |
0fd73091 | 3696 | struct lxc_list *it, *next; |
ab799c0b | 3697 | |
0fd73091 | 3698 | lxc_list_for_each_safe (it, &c->environment, next) { |
ab799c0b SG |
3699 | lxc_list_del(it); |
3700 | free(it->elem); | |
3701 | free(it); | |
3702 | } | |
0fd73091 | 3703 | |
ab799c0b SG |
3704 | return 0; |
3705 | } | |
3706 | ||
72d0e1cb SG |
3707 | int lxc_clear_mount_entries(struct lxc_conf *c) |
3708 | { | |
0fd73091 | 3709 | struct lxc_list *it, *next; |
72d0e1cb | 3710 | |
0fd73091 | 3711 | lxc_list_for_each_safe (it, &c->mount_list, next) { |
72d0e1cb SG |
3712 | lxc_list_del(it); |
3713 | free(it->elem); | |
3714 | free(it); | |
3715 | } | |
0fd73091 | 3716 | |
72d0e1cb SG |
3717 | return 0; |
3718 | } | |
3719 | ||
b099e9e9 SH |
3720 | int lxc_clear_automounts(struct lxc_conf *c) |
3721 | { | |
3722 | c->auto_mounts = 0; | |
3723 | return 0; | |
3724 | } | |
3725 | ||
12a50cc6 | 3726 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 3727 | { |
72d0e1cb | 3728 | int i; |
0fd73091 CB |
3729 | struct lxc_list *it, *next; |
3730 | const char *k = NULL; | |
3731 | bool all = false, done = false; | |
72d0e1cb | 3732 | |
17ed13a3 SH |
3733 | if (strcmp(key, "lxc.hook") == 0) |
3734 | all = true; | |
6333c915 CB |
3735 | else if (strncmp(key, "lxc.hook.", STRLITERALLEN("lxc.hook.")) == 0) |
3736 | k = key + STRLITERALLEN("lxc.hook."); | |
a6390f01 WB |
3737 | else |
3738 | return -1; | |
17ed13a3 | 3739 | |
0fd73091 | 3740 | for (i = 0; i < NUM_LXC_HOOKS; i++) { |
17ed13a3 | 3741 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
0fd73091 | 3742 | lxc_list_for_each_safe (it, &c->hooks[i], next) { |
17ed13a3 SH |
3743 | lxc_list_del(it); |
3744 | free(it->elem); | |
3745 | free(it); | |
3746 | } | |
0fd73091 | 3747 | |
17ed13a3 | 3748 | done = true; |
72d0e1cb SG |
3749 | } |
3750 | } | |
17ed13a3 | 3751 | |
55022530 CB |
3752 | if (!done) |
3753 | return log_error(-1, "Invalid hook key: %s", key); | |
0fd73091 | 3754 | |
72d0e1cb SG |
3755 | return 0; |
3756 | } | |
8eb5694b | 3757 | |
4184c3e1 SH |
3758 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
3759 | { | |
0fd73091 | 3760 | struct lxc_list *it, *next; |
4184c3e1 | 3761 | |
0fd73091 | 3762 | lxc_list_for_each_safe (it, &conf->aliens, next) { |
4184c3e1 SH |
3763 | lxc_list_del(it); |
3764 | free(it->elem); | |
3765 | free(it); | |
3766 | } | |
3767 | } | |
3768 | ||
c7b15d1e | 3769 | void lxc_clear_includes(struct lxc_conf *conf) |
f979ac15 | 3770 | { |
0fd73091 | 3771 | struct lxc_list *it, *next; |
f979ac15 | 3772 | |
0fd73091 | 3773 | lxc_list_for_each_safe (it, &conf->includes, next) { |
f979ac15 SH |
3774 | lxc_list_del(it); |
3775 | free(it->elem); | |
3776 | free(it); | |
3777 | } | |
3778 | } | |
3779 | ||
1800f924 WB |
3780 | int lxc_clear_apparmor_raw(struct lxc_conf *c) |
3781 | { | |
3782 | struct lxc_list *it, *next; | |
3783 | ||
3784 | lxc_list_for_each_safe (it, &c->lsm_aa_raw, next) { | |
3785 | lxc_list_del(it); | |
3786 | free(it->elem); | |
3787 | free(it); | |
3788 | } | |
3789 | ||
3790 | return 0; | |
3791 | } | |
3792 | ||
8eb5694b SH |
3793 | void lxc_conf_free(struct lxc_conf *conf) |
3794 | { | |
3795 | if (!conf) | |
3796 | return; | |
0fd73091 | 3797 | |
858377e4 SH |
3798 | if (current_config == conf) |
3799 | current_config = NULL; | |
aed105d5 | 3800 | lxc_terminal_conf_free(&conf->console); |
f10fad2f | 3801 | free(conf->rootfs.mount); |
b3b8c97f | 3802 | free(conf->rootfs.bdev_type); |
f10fad2f ME |
3803 | free(conf->rootfs.options); |
3804 | free(conf->rootfs.path); | |
9dd75981 | 3805 | free(conf->rootfs.data); |
f10fad2f | 3806 | free(conf->logfile); |
858377e4 SH |
3807 | if (conf->logfd != -1) |
3808 | close(conf->logfd); | |
f10fad2f | 3809 | free(conf->utsname); |
885766f5 CB |
3810 | free(conf->ttys.dir); |
3811 | free(conf->ttys.tty_names); | |
f10fad2f ME |
3812 | free(conf->fstab); |
3813 | free(conf->rcfile); | |
5cda27c1 | 3814 | free(conf->execute_cmd); |
f10fad2f | 3815 | free(conf->init_cmd); |
3c491553 | 3816 | free(conf->init_cwd); |
6b0d5538 | 3817 | free(conf->unexpanded_config); |
76d0127f | 3818 | free(conf->syslog); |
c302b476 | 3819 | lxc_free_networks(&conf->network); |
f10fad2f | 3820 | free(conf->lsm_aa_profile); |
1800f924 | 3821 | free(conf->lsm_aa_profile_computed); |
f10fad2f | 3822 | free(conf->lsm_se_context); |
c3e3c21a | 3823 | lxc_seccomp_free(&conf->seccomp); |
8eb5694b | 3824 | lxc_clear_config_caps(conf); |
1fb86a7c | 3825 | lxc_clear_config_keepcaps(conf); |
54860ed0 CB |
3826 | lxc_clear_cgroups(conf, "lxc.cgroup", CGROUP_SUPER_MAGIC); |
3827 | lxc_clear_cgroups(conf, "lxc.cgroup2", CGROUP2_SUPER_MAGIC); | |
4bfb655e | 3828 | lxc_clear_devices(conf); |
bf651989 | 3829 | lxc_clear_cgroup2_devices(conf); |
17ed13a3 | 3830 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 3831 | lxc_clear_mount_entries(conf); |
27c27d73 | 3832 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 3833 | lxc_clear_groups(conf); |
f979ac15 | 3834 | lxc_clear_includes(conf); |
761d81ca | 3835 | lxc_clear_aliens(conf); |
ab799c0b | 3836 | lxc_clear_environment(conf); |
240d4b74 | 3837 | lxc_clear_limits(conf, "lxc.prlimit"); |
7edd0540 | 3838 | lxc_clear_sysctls(conf, "lxc.sysctl"); |
61d7a733 | 3839 | lxc_clear_procs(conf, "lxc.proc"); |
1800f924 | 3840 | lxc_clear_apparmor_raw(conf); |
a3ed9b81 | 3841 | lxc_clear_namespace(conf); |
43654d34 | 3842 | free(conf->cgroup_meta.dir); |
a900cbaf WB |
3843 | free(conf->cgroup_meta.monitor_dir); |
3844 | free(conf->cgroup_meta.container_dir); | |
3845 | free(conf->cgroup_meta.namespace_dir); | |
43654d34 | 3846 | free(conf->cgroup_meta.controllers); |
7a41e857 LT |
3847 | free(conf->shmount.path_host); |
3848 | free(conf->shmount.path_cont); | |
8eb5694b SH |
3849 | free(conf); |
3850 | } | |
4355ab5f SH |
3851 | |
3852 | struct userns_fn_data { | |
3853 | int (*fn)(void *); | |
c9b7c33e | 3854 | const char *fn_name; |
4355ab5f SH |
3855 | void *arg; |
3856 | int p[2]; | |
3857 | }; | |
3858 | ||
3859 | static int run_userns_fn(void *data) | |
3860 | { | |
766c5b6d | 3861 | struct userns_fn_data *d = data; |
adaffdd7 | 3862 | int ret; |
4355ab5f | 3863 | char c; |
4355ab5f | 3864 | |
766c5b6d | 3865 | close_prot_errno_disarm(d->p[1]); |
f8aa4bf3 | 3866 | |
766c5b6d CB |
3867 | /* |
3868 | * Wait for parent to finish establishing a new mapping in the user | |
f8aa4bf3 CB |
3869 | * namespace we are executing in. |
3870 | */ | |
adaffdd7 | 3871 | ret = lxc_read_nointr(d->p[0], &c, 1); |
766c5b6d | 3872 | close_prot_errno_disarm(d->p[0]); |
adaffdd7 CB |
3873 | if (ret != 1) |
3874 | return -1; | |
f8aa4bf3 | 3875 | |
c9b7c33e | 3876 | if (d->fn_name) |
adaffdd7 | 3877 | TRACE("Calling function \"%s\"", d->fn_name); |
0fd73091 | 3878 | |
f8aa4bf3 | 3879 | /* Call function to run. */ |
4355ab5f SH |
3880 | return d->fn(d->arg); |
3881 | } | |
3882 | ||
7581a82f | 3883 | static struct id_map *mapped_nsid_add(const struct lxc_conf *conf, unsigned id, |
db7cfe23 CB |
3884 | enum idtype idtype) |
3885 | { | |
5173b710 CB |
3886 | const struct id_map *map; |
3887 | struct id_map *retmap; | |
db7cfe23 CB |
3888 | |
3889 | map = find_mapped_nsid_entry(conf, id, idtype); | |
3890 | if (!map) | |
3891 | return NULL; | |
3892 | ||
3893 | retmap = malloc(sizeof(*retmap)); | |
3894 | if (!retmap) | |
3895 | return NULL; | |
3896 | ||
3897 | memcpy(retmap, map, sizeof(*retmap)); | |
3898 | return retmap; | |
3899 | } | |
3900 | ||
7581a82f | 3901 | static struct id_map *find_mapped_hostid_entry(const struct lxc_conf *conf, |
c4333195 | 3902 | unsigned id, enum idtype idtype) |
f8aa4bf3 | 3903 | { |
f8aa4bf3 | 3904 | struct id_map *map; |
0fd73091 | 3905 | struct lxc_list *it; |
f8aa4bf3 CB |
3906 | struct id_map *retmap = NULL; |
3907 | ||
0fd73091 | 3908 | lxc_list_for_each (it, &conf->id_map) { |
f8aa4bf3 CB |
3909 | map = it->elem; |
3910 | if (map->idtype != idtype) | |
3911 | continue; | |
3912 | ||
3913 | if (id >= map->hostid && id < map->hostid + map->range) { | |
3914 | retmap = map; | |
3915 | break; | |
3916 | } | |
3917 | } | |
3918 | ||
f8aa4bf3 CB |
3919 | return retmap; |
3920 | } | |
3921 | ||
0fd73091 | 3922 | /* Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
f8aa4bf3 | 3923 | * existing one or establish a new one. |
4355ab5f | 3924 | */ |
7581a82f | 3925 | static struct id_map *mapped_hostid_add(const struct lxc_conf *conf, uid_t id, |
0fd73091 | 3926 | enum idtype type) |
4355ab5f | 3927 | { |
55022530 | 3928 | __do_free struct id_map *entry = NULL; |
28a2d9e7 | 3929 | int hostid_mapped; |
55022530 | 3930 | struct id_map *tmp = NULL; |
c4333195 CB |
3931 | |
3932 | entry = malloc(sizeof(*entry)); | |
3933 | if (!entry) | |
3934 | return NULL; | |
f8aa4bf3 | 3935 | |
28a2d9e7 | 3936 | /* Reuse existing mapping. */ |
c4333195 | 3937 | tmp = find_mapped_hostid_entry(conf, id, type); |
1758c195 CB |
3938 | if (tmp) { |
3939 | memcpy(entry, tmp, sizeof(*entry)); | |
3940 | } else { | |
3941 | /* Find new mapping. */ | |
3942 | hostid_mapped = find_unmapped_nsid(conf, type); | |
3943 | if (hostid_mapped < 0) | |
3944 | return log_debug(NULL, "Failed to find free mapping for id %d", id); | |
3945 | ||
3946 | entry->idtype = type; | |
3947 | entry->nsid = hostid_mapped; | |
3948 | entry->hostid = (unsigned long)id; | |
3949 | entry->range = 1; | |
3950 | } | |
4355ab5f | 3951 | |
55022530 | 3952 | return move_ptr(entry); |
4355ab5f SH |
3953 | } |
3954 | ||
dbfcdf86 CB |
3955 | static struct lxc_list *get_minimal_idmap(const struct lxc_conf *conf, |
3956 | uid_t *resuid, gid_t *resgid) | |
4355ab5f | 3957 | { |
00d6cfe2 CB |
3958 | __do_free struct id_map *container_root_uid = NULL, |
3959 | *container_root_gid = NULL, | |
3960 | *host_uid_map = NULL, *host_gid_map = NULL; | |
3961 | __do_free struct lxc_list *idmap = NULL; | |
f8aa4bf3 | 3962 | uid_t euid, egid; |
4160c3a0 CB |
3963 | uid_t nsuid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; |
3964 | gid_t nsgid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
00d6cfe2 | 3965 | struct lxc_list *tmplist = NULL; |
4355ab5f | 3966 | |
db7cfe23 | 3967 | /* Find container root mappings. */ |
4160c3a0 | 3968 | container_root_uid = mapped_nsid_add(conf, nsuid, ID_TYPE_UID); |
55022530 CB |
3969 | if (!container_root_uid) |
3970 | return log_debug(NULL, "Failed to find mapping for namespace uid %d", 0); | |
dcf0ffdf CB |
3971 | euid = geteuid(); |
3972 | if (euid >= container_root_uid->hostid && | |
3973 | euid < (container_root_uid->hostid + container_root_uid->range)) | |
2c996219 | 3974 | host_uid_map = move_ptr(container_root_uid); |
f8aa4bf3 | 3975 | |
4160c3a0 | 3976 | container_root_gid = mapped_nsid_add(conf, nsgid, ID_TYPE_GID); |
55022530 CB |
3977 | if (!container_root_gid) |
3978 | return log_debug(NULL, "Failed to find mapping for namespace gid %d", 0); | |
dcf0ffdf CB |
3979 | egid = getegid(); |
3980 | if (egid >= container_root_gid->hostid && | |
3981 | egid < (container_root_gid->hostid + container_root_gid->range)) | |
2c996219 | 3982 | host_gid_map = move_ptr(container_root_gid); |
f8aa4bf3 CB |
3983 | |
3984 | /* Check whether the {g,u}id of the user has a mapping. */ | |
954b7d9b | 3985 | if (!host_uid_map) |
c4333195 | 3986 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
55022530 CB |
3987 | if (!host_uid_map) |
3988 | return log_debug(NULL, "Failed to find mapping for uid %d", euid); | |
f8aa4bf3 | 3989 | |
dcf0ffdf CB |
3990 | if (!host_gid_map) |
3991 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); | |
55022530 CB |
3992 | if (!host_gid_map) |
3993 | return log_debug(NULL, "Failed to find mapping for gid %d", egid); | |
28a2d9e7 CB |
3994 | |
3995 | /* Allocate new {g,u}id map list. */ | |
3996 | idmap = malloc(sizeof(*idmap)); | |
3997 | if (!idmap) | |
00d6cfe2 | 3998 | return NULL; |
28a2d9e7 CB |
3999 | lxc_list_init(idmap); |
4000 | ||
f8aa4bf3 CB |
4001 | /* Add container root to the map. */ |
4002 | tmplist = malloc(sizeof(*tmplist)); | |
4003 | if (!tmplist) | |
00d6cfe2 | 4004 | return NULL; |
47649d5b CB |
4005 | /* idmap will now keep track of that memory. */ |
4006 | lxc_list_add_elem(tmplist, move_ptr(host_uid_map)); | |
f8aa4bf3 | 4007 | lxc_list_add_tail(idmap, tmplist); |
28a2d9e7 | 4008 | |
2c996219 | 4009 | if (container_root_uid) { |
28a2d9e7 CB |
4010 | /* Add container root to the map. */ |
4011 | tmplist = malloc(sizeof(*tmplist)); | |
4012 | if (!tmplist) | |
00d6cfe2 | 4013 | return NULL; |
47649d5b CB |
4014 | /* idmap will now keep track of that memory. */ |
4015 | lxc_list_add_elem(tmplist, move_ptr(container_root_uid)); | |
28a2d9e7 | 4016 | lxc_list_add_tail(idmap, tmplist); |
28a2d9e7 | 4017 | } |
f8aa4bf3 CB |
4018 | |
4019 | tmplist = malloc(sizeof(*tmplist)); | |
4020 | if (!tmplist) | |
00d6cfe2 | 4021 | return NULL; |
47649d5b CB |
4022 | /* idmap will now keep track of that memory. */ |
4023 | lxc_list_add_elem(tmplist, move_ptr(host_gid_map)); | |
f8aa4bf3 | 4024 | lxc_list_add_tail(idmap, tmplist); |
28a2d9e7 | 4025 | |
2c996219 | 4026 | if (container_root_gid) { |
28a2d9e7 CB |
4027 | tmplist = malloc(sizeof(*tmplist)); |
4028 | if (!tmplist) | |
00d6cfe2 | 4029 | return NULL; |
47649d5b CB |
4030 | /* idmap will now keep track of that memory. */ |
4031 | lxc_list_add_elem(tmplist, move_ptr(container_root_gid)); | |
28a2d9e7 | 4032 | lxc_list_add_tail(idmap, tmplist); |
28a2d9e7 | 4033 | } |
f8aa4bf3 | 4034 | |
dbfcdf86 CB |
4035 | TRACE("Allocated minimal idmapping for ns uid %d and ns gid %d", nsuid, nsgid); |
4036 | ||
4037 | if (resuid) | |
4038 | *resuid = nsuid; | |
4039 | if (resgid) | |
4040 | *resgid = nsgid; | |
00d6cfe2 | 4041 | return move_ptr(idmap); |
dcf0ffdf CB |
4042 | } |
4043 | ||
766c5b6d CB |
4044 | /* |
4045 | * Run a function in a new user namespace. | |
dcf0ffdf CB |
4046 | * The caller's euid/egid will be mapped if it is not already. |
4047 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
4048 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
4049 | * This means we require only to establish a mapping from: | |
4050 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
4051 | * - the container root -> some sub{g,u}id | |
915e3dbd | 4052 | * The former we add, if the user did not specify a mapping. The latter we |
6f3fd27f | 4053 | * retrieve from the container's configured {g,u}id mappings as it must have been |
dcf0ffdf CB |
4054 | * there to start the container in the first place. |
4055 | */ | |
7581a82f | 4056 | int userns_exec_1(const struct lxc_conf *conf, int (*fn)(void *), void *data, |
dcf0ffdf CB |
4057 | const char *fn_name) |
4058 | { | |
766c5b6d | 4059 | call_cleaner(lxc_free_idmap) struct lxc_list *idmap = NULL; |
0fd73091 CB |
4060 | int ret = -1, status = -1; |
4061 | char c = '1'; | |
46bc6f2a CB |
4062 | struct userns_fn_data d = { |
4063 | .arg = data, | |
4064 | .fn = fn, | |
4065 | .fn_name = fn_name, | |
4066 | }; | |
766c5b6d CB |
4067 | pid_t pid; |
4068 | int pipe_fds[2]; | |
dcf0ffdf | 4069 | |
2b2655a8 CB |
4070 | if (!conf) |
4071 | return -EINVAL; | |
4072 | ||
dbfcdf86 | 4073 | idmap = get_minimal_idmap(conf, NULL, NULL); |
dcf0ffdf | 4074 | if (!idmap) |
766c5b6d | 4075 | return ret_errno(ENOENT); |
dcf0ffdf | 4076 | |
766c5b6d CB |
4077 | ret = pipe2(pipe_fds, O_CLOEXEC); |
4078 | if (ret < 0) | |
4079 | return -errno; | |
4080 | ||
766c5b6d CB |
4081 | d.p[0] = pipe_fds[0]; |
4082 | d.p[1] = pipe_fds[1]; | |
dcf0ffdf CB |
4083 | |
4084 | /* Clone child in new user namespace. */ | |
a59440be | 4085 | pid = lxc_raw_clone_cb(run_userns_fn, &d, CLONE_NEWUSER, NULL); |
dcf0ffdf | 4086 | if (pid < 0) { |
0fd73091 | 4087 | ERROR("Failed to clone process in new user namespace"); |
dcf0ffdf CB |
4088 | goto on_error; |
4089 | } | |
4090 | ||
766c5b6d | 4091 | close_prot_errno_disarm(pipe_fds[0]); |
dcf0ffdf | 4092 | |
4b73005c CB |
4093 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || |
4094 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
dcf0ffdf | 4095 | struct id_map *map; |
0fd73091 | 4096 | struct lxc_list *it; |
dcf0ffdf | 4097 | |
766c5b6d | 4098 | lxc_list_for_each(it, idmap) { |
f8aa4bf3 | 4099 | map = it->elem; |
766c5b6d CB |
4100 | TRACE("Establishing %cid mapping for \"%d\" in new user namespace: nsuid %lu - hostid %lu - range %lu", |
4101 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, map->nsid, map->hostid, map->range); | |
f8aa4bf3 | 4102 | } |
4355ab5f SH |
4103 | } |
4104 | ||
f8aa4bf3 | 4105 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 4106 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 | 4107 | if (ret < 0) { |
0fd73091 | 4108 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); |
f8aa4bf3 | 4109 | goto on_error; |
4355ab5f SH |
4110 | } |
4111 | ||
f8aa4bf3 | 4112 | /* Tell child to proceed. */ |
766c5b6d | 4113 | if (lxc_write_nointr(pipe_fds[1], &c, 1) != 1) { |
dcf0ffdf | 4114 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
f8aa4bf3 | 4115 | goto on_error; |
4355ab5f SH |
4116 | } |
4117 | ||
686dd5d1 | 4118 | on_error: |
766c5b6d CB |
4119 | close_prot_errno_disarm(pipe_fds[0]); |
4120 | close_prot_errno_disarm(pipe_fds[1]); | |
f8aa4bf3 | 4121 | |
ee1b16bc TA |
4122 | /* Wait for child to finish. */ |
4123 | if (pid > 0) | |
4124 | status = wait_for_pid(pid); | |
4125 | ||
686dd5d1 CB |
4126 | if (status < 0) |
4127 | ret = -1; | |
4128 | ||
f8aa4bf3 | 4129 | return ret; |
4355ab5f | 4130 | } |
97e9cfa0 | 4131 | |
d1783ef4 CB |
4132 | int userns_exec_minimal(const struct lxc_conf *conf, |
4133 | int (*fn_parent)(void *), void *fn_parent_data, | |
4134 | int (*fn_child)(void *), void *fn_child_data) | |
edf88289 CB |
4135 | { |
4136 | call_cleaner(lxc_free_idmap) struct lxc_list *idmap = NULL; | |
dbfcdf86 CB |
4137 | uid_t resuid = LXC_INVALID_UID; |
4138 | gid_t resgid = LXC_INVALID_GID; | |
edf88289 | 4139 | char c = '1'; |
dbfcdf86 | 4140 | ssize_t ret; |
edf88289 CB |
4141 | pid_t pid; |
4142 | int sock_fds[2]; | |
4143 | ||
d1783ef4 | 4144 | if (!conf || !fn_child) |
dbfcdf86 | 4145 | return ret_errno(EINVAL); |
edf88289 | 4146 | |
dbfcdf86 | 4147 | idmap = get_minimal_idmap(conf, &resuid, &resgid); |
edf88289 CB |
4148 | if (!idmap) |
4149 | return ret_errno(ENOENT); | |
4150 | ||
4151 | ret = socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, sock_fds); | |
4152 | if (ret < 0) | |
4153 | return -errno; | |
4154 | ||
4155 | pid = fork(); | |
4156 | if (pid < 0) { | |
dbfcdf86 | 4157 | SYSERROR("Failed to create new process"); |
edf88289 CB |
4158 | goto on_error; |
4159 | } | |
4160 | ||
4161 | if (pid == 0) { | |
4162 | close_prot_errno_disarm(sock_fds[1]); | |
4163 | ||
4164 | ret = unshare(CLONE_NEWUSER); | |
dbfcdf86 CB |
4165 | if (ret < 0) { |
4166 | SYSERROR("Failed to unshare new user namespace"); | |
edf88289 | 4167 | _exit(EXIT_FAILURE); |
dbfcdf86 | 4168 | } |
edf88289 | 4169 | |
dbfcdf86 CB |
4170 | ret = lxc_write_nointr(sock_fds[0], &c, 1); |
4171 | if (ret != 1) | |
edf88289 CB |
4172 | _exit(EXIT_FAILURE); |
4173 | ||
4174 | ret = lxc_read_nointr(sock_fds[0], &c, 1); | |
4175 | if (ret != 1) | |
4176 | _exit(EXIT_FAILURE); | |
4177 | ||
4178 | close_prot_errno_disarm(sock_fds[0]); | |
4179 | ||
4180 | if (!lxc_setgroups(0, NULL) && errno != EPERM) | |
4181 | _exit(EXIT_FAILURE); | |
4182 | ||
dbfcdf86 CB |
4183 | ret = setresgid(resgid, resgid, resgid); |
4184 | if (ret < 0) { | |
4185 | SYSERROR("Failed to setresgid(%d, %d, %d)", | |
4186 | resgid, resgid, resgid); | |
edf88289 | 4187 | _exit(EXIT_FAILURE); |
dbfcdf86 CB |
4188 | } |
4189 | ||
4190 | ret = setresuid(resuid, resuid, resuid); | |
4191 | if (ret < 0) { | |
4192 | SYSERROR("Failed to setresuid(%d, %d, %d)", | |
4193 | resuid, resuid, resuid); | |
4194 | _exit(EXIT_FAILURE); | |
4195 | } | |
edf88289 | 4196 | |
d1783ef4 | 4197 | ret = fn_child(fn_child_data); |
dbfcdf86 CB |
4198 | if (ret) { |
4199 | SYSERROR("Running function in new user namespace failed"); | |
edf88289 | 4200 | _exit(EXIT_FAILURE); |
dbfcdf86 | 4201 | } |
edf88289 CB |
4202 | |
4203 | _exit(EXIT_SUCCESS); | |
4204 | } | |
4205 | ||
4206 | close_prot_errno_disarm(sock_fds[0]); | |
4207 | ||
4208 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || | |
4209 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
4210 | struct id_map *map; | |
4211 | struct lxc_list *it; | |
4212 | ||
4213 | lxc_list_for_each(it, idmap) { | |
4214 | map = it->elem; | |
4215 | TRACE("Establishing %cid mapping for \"%d\" in new user namespace: nsuid %lu - hostid %lu - range %lu", | |
4216 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, map->nsid, map->hostid, map->range); | |
4217 | } | |
4218 | } | |
4219 | ||
4220 | ret = lxc_read_nointr(sock_fds[1], &c, 1); | |
4221 | if (ret != 1) { | |
4222 | SYSERROR("Failed waiting for child process %d\" to tell us to proceed", pid); | |
4223 | goto on_error; | |
4224 | } | |
4225 | ||
4226 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
4227 | ret = lxc_map_ids(idmap, pid); | |
4228 | if (ret < 0) { | |
4229 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); | |
4230 | goto on_error; | |
4231 | } | |
4232 | ||
4233 | /* Tell child to proceed. */ | |
4234 | ret = lxc_write_nointr(sock_fds[1], &c, 1); | |
4235 | if (ret != 1) { | |
4236 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); | |
4237 | goto on_error; | |
4238 | } | |
4239 | ||
d1783ef4 CB |
4240 | if (fn_parent && fn_parent(fn_parent_data)) { |
4241 | SYSERROR("Running parent function failed"); | |
4242 | _exit(EXIT_FAILURE); | |
4243 | } | |
4244 | ||
edf88289 CB |
4245 | on_error: |
4246 | close_prot_errno_disarm(sock_fds[0]); | |
4247 | close_prot_errno_disarm(sock_fds[1]); | |
4248 | ||
4249 | /* Wait for child to finish. */ | |
dbfcdf86 CB |
4250 | if (pid < 0) |
4251 | return -1; | |
edf88289 | 4252 | |
dbfcdf86 | 4253 | return wait_for_pid(pid); |
edf88289 CB |
4254 | } |
4255 | ||
415a8851 CB |
4256 | int userns_exec_full(struct lxc_conf *conf, int (*fn)(void *), void *data, |
4257 | const char *fn_name) | |
4258 | { | |
4259 | pid_t pid; | |
4260 | uid_t euid, egid; | |
415a8851 CB |
4261 | int p[2]; |
4262 | struct id_map *map; | |
4263 | struct lxc_list *cur; | |
0fd73091 | 4264 | struct userns_fn_data d; |
415a8851 | 4265 | int ret = -1; |
0fd73091 | 4266 | char c = '1'; |
415a8851 CB |
4267 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
4268 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, | |
4269 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4270 | ||
2b2655a8 CB |
4271 | if (!conf) |
4272 | return -EINVAL; | |
4273 | ||
979f9e34 | 4274 | ret = pipe2(p, O_CLOEXEC); |
415a8851 CB |
4275 | if (ret < 0) { |
4276 | SYSERROR("opening pipe"); | |
4277 | return -1; | |
4278 | } | |
4279 | d.fn = fn; | |
4280 | d.fn_name = fn_name; | |
4281 | d.arg = data; | |
4282 | d.p[0] = p[0]; | |
4283 | d.p[1] = p[1]; | |
4284 | ||
4285 | /* Clone child in new user namespace. */ | |
33258b95 | 4286 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER, NULL); |
415a8851 | 4287 | if (pid < 0) { |
0fd73091 | 4288 | ERROR("Failed to clone process in new user namespace"); |
415a8851 CB |
4289 | goto on_error; |
4290 | } | |
4291 | ||
4292 | close(p[0]); | |
4293 | p[0] = -1; | |
4294 | ||
4295 | euid = geteuid(); | |
4296 | egid = getegid(); | |
4297 | ||
4298 | /* Allocate new {g,u}id map list. */ | |
4299 | idmap = malloc(sizeof(*idmap)); | |
4300 | if (!idmap) | |
4301 | goto on_error; | |
4302 | lxc_list_init(idmap); | |
4303 | ||
4304 | /* Find container root. */ | |
0fd73091 | 4305 | lxc_list_for_each (cur, &conf->id_map) { |
415a8851 CB |
4306 | struct id_map *tmpmap; |
4307 | ||
4308 | tmplist = malloc(sizeof(*tmplist)); | |
4309 | if (!tmplist) | |
4310 | goto on_error; | |
4311 | ||
4312 | tmpmap = malloc(sizeof(*tmpmap)); | |
4313 | if (!tmpmap) { | |
4314 | free(tmplist); | |
4315 | goto on_error; | |
4316 | } | |
4317 | ||
4318 | memset(tmpmap, 0, sizeof(*tmpmap)); | |
4319 | memcpy(tmpmap, cur->elem, sizeof(*tmpmap)); | |
4320 | tmplist->elem = tmpmap; | |
4321 | ||
4322 | lxc_list_add_tail(idmap, tmplist); | |
4323 | ||
4324 | map = cur->elem; | |
4325 | ||
4326 | if (map->idtype == ID_TYPE_UID) | |
4327 | if (euid >= map->hostid && euid < map->hostid + map->range) | |
4328 | host_uid_map = map; | |
4329 | ||
4330 | if (map->idtype == ID_TYPE_GID) | |
4331 | if (egid >= map->hostid && egid < map->hostid + map->range) | |
4332 | host_gid_map = map; | |
4333 | ||
4334 | if (map->nsid != 0) | |
4335 | continue; | |
4336 | ||
4337 | if (map->idtype == ID_TYPE_UID) | |
4338 | if (container_root_uid == NULL) | |
4339 | container_root_uid = map; | |
4340 | ||
4341 | if (map->idtype == ID_TYPE_GID) | |
4342 | if (container_root_gid == NULL) | |
4343 | container_root_gid = map; | |
4344 | } | |
4345 | ||
4346 | if (!container_root_uid || !container_root_gid) { | |
4347 | ERROR("No mapping for container root found"); | |
4348 | goto on_error; | |
4349 | } | |
4350 | ||
4351 | /* Check whether the {g,u}id of the user has a mapping. */ | |
4352 | if (!host_uid_map) | |
c4333195 | 4353 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
415a8851 CB |
4354 | else |
4355 | host_uid_map = container_root_uid; | |
4356 | ||
4357 | if (!host_gid_map) | |
c4333195 | 4358 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); |
415a8851 CB |
4359 | else |
4360 | host_gid_map = container_root_gid; | |
4361 | ||
4362 | if (!host_uid_map) { | |
4363 | DEBUG("Failed to find mapping for uid %d", euid); | |
4364 | goto on_error; | |
4365 | } | |
4366 | ||
4367 | if (!host_gid_map) { | |
4368 | DEBUG("Failed to find mapping for gid %d", egid); | |
4369 | goto on_error; | |
4370 | } | |
4371 | ||
4372 | if (host_uid_map && (host_uid_map != container_root_uid)) { | |
4373 | /* Add container root to the map. */ | |
4374 | tmplist = malloc(sizeof(*tmplist)); | |
4375 | if (!tmplist) | |
4376 | goto on_error; | |
4377 | lxc_list_add_elem(tmplist, host_uid_map); | |
4378 | lxc_list_add_tail(idmap, tmplist); | |
4379 | } | |
4380 | /* idmap will now keep track of that memory. */ | |
4381 | host_uid_map = NULL; | |
4382 | ||
4383 | if (host_gid_map && (host_gid_map != container_root_gid)) { | |
4384 | tmplist = malloc(sizeof(*tmplist)); | |
4385 | if (!tmplist) | |
4386 | goto on_error; | |
4387 | lxc_list_add_elem(tmplist, host_gid_map); | |
4388 | lxc_list_add_tail(idmap, tmplist); | |
4389 | } | |
4390 | /* idmap will now keep track of that memory. */ | |
4391 | host_gid_map = NULL; | |
4392 | ||
4393 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || | |
4394 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
0fd73091 | 4395 | lxc_list_for_each (cur, idmap) { |
415a8851 CB |
4396 | map = cur->elem; |
4397 | TRACE("establishing %cid mapping for \"%d\" in new " | |
4398 | "user namespace: nsuid %lu - hostid %lu - range " | |
4399 | "%lu", | |
4400 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4401 | map->nsid, map->hostid, map->range); | |
4402 | } | |
4403 | } | |
4404 | ||
4405 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
4406 | ret = lxc_map_ids(idmap, pid); | |
4407 | if (ret < 0) { | |
0fd73091 | 4408 | ERROR("error setting up {g,u}id mappings for child process \"%d\"", pid); |
415a8851 CB |
4409 | goto on_error; |
4410 | } | |
4411 | ||
4412 | /* Tell child to proceed. */ | |
489f39be | 4413 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
0fd73091 | 4414 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
415a8851 CB |
4415 | goto on_error; |
4416 | } | |
4417 | ||
686dd5d1 | 4418 | on_error: |
ee1b16bc TA |
4419 | if (p[0] != -1) |
4420 | close(p[0]); | |
4421 | close(p[1]); | |
4422 | ||
415a8851 | 4423 | /* Wait for child to finish. */ |
686dd5d1 CB |
4424 | if (pid > 0) |
4425 | ret = wait_for_pid(pid); | |
415a8851 | 4426 | |
80758b4b | 4427 | if (idmap) { |
415a8851 | 4428 | lxc_free_idmap(idmap); |
80758b4b DJ |
4429 | free(idmap); |
4430 | } | |
4431 | ||
415a8851 CB |
4432 | if (host_uid_map && (host_uid_map != container_root_uid)) |
4433 | free(host_uid_map); | |
4434 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4435 | free(host_gid_map); | |
4436 | ||
415a8851 CB |
4437 | return ret; |
4438 | } | |
4439 | ||
234998b4 CB |
4440 | static int add_idmap_entry(struct lxc_list *idmap, enum idtype idtype, |
4441 | unsigned long nsid, unsigned long hostid, | |
4442 | unsigned long range) | |
4443 | { | |
4444 | __do_free struct id_map *new_idmap = NULL; | |
4445 | __do_free struct lxc_list *new_list = NULL; | |
4446 | ||
4447 | new_idmap = zalloc(sizeof(*new_idmap)); | |
4448 | if (!new_idmap) | |
4449 | return ret_errno(ENOMEM); | |
4450 | ||
4451 | new_idmap->idtype = idtype; | |
4452 | new_idmap->hostid = hostid; | |
4453 | new_idmap->nsid = nsid; | |
4454 | new_idmap->range = range; | |
4455 | ||
4456 | new_list = zalloc(sizeof(*new_list)); | |
4457 | if (!new_list) | |
4458 | return ret_errno(ENOMEM); | |
4459 | ||
4460 | new_list->elem = move_ptr(new_idmap); | |
4461 | lxc_list_add_tail(idmap, move_ptr(new_list)); | |
4462 | ||
4463 | INFO("Adding id map: type %c nsid %lu hostid %lu range %lu", | |
4464 | idtype == ID_TYPE_UID ? 'u' : 'g', nsid, hostid, range); | |
4465 | return 0; | |
4466 | } | |
4467 | ||
4468 | int userns_exec_mapped_root(const char *path, int path_fd, | |
4469 | const struct lxc_conf *conf) | |
4470 | { | |
4471 | call_cleaner(lxc_free_idmap) struct lxc_list *idmap = NULL; | |
4472 | __do_close int fd = -EBADF; | |
4473 | int target_fd = -EBADF; | |
4474 | char c = '1'; | |
4475 | ssize_t ret; | |
4476 | pid_t pid; | |
4477 | int sock_fds[2]; | |
4478 | uid_t container_host_uid, hostuid; | |
4479 | gid_t container_host_gid, hostgid; | |
4480 | struct stat st; | |
4481 | ||
4482 | if (!conf || (!path && path_fd < 0)) | |
4483 | return ret_errno(EINVAL); | |
4484 | ||
4485 | if (!path) | |
4486 | path = "(null)"; | |
4487 | ||
4488 | container_host_uid = get_mapped_rootid(conf, ID_TYPE_UID); | |
4489 | if (!uid_valid(container_host_uid)) | |
4490 | return log_error(-1, "No uid mapping for container root"); | |
4491 | ||
4492 | container_host_gid = get_mapped_rootid(conf, ID_TYPE_GID); | |
4493 | if (!gid_valid(container_host_gid)) | |
4494 | return log_error(-1, "No gid mapping for container root"); | |
4495 | ||
cf68ffd9 CB |
4496 | if (path_fd < 0) { |
4497 | fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_PATH); | |
234998b4 CB |
4498 | if (fd < 0) |
4499 | return log_error_errno(-errno, errno, "Failed to open \"%s\"", path); | |
4500 | target_fd = fd; | |
4501 | } else { | |
4502 | target_fd = path_fd; | |
4503 | } | |
4504 | ||
4505 | hostuid = geteuid(); | |
4506 | /* We are root so chown directly. */ | |
4507 | if (hostuid == 0) { | |
4508 | ret = fchown(target_fd, container_host_uid, container_host_gid); | |
4509 | if (ret) | |
4510 | return log_error_errno(-errno, errno, | |
4511 | "Failed to fchown(%d(%s), %d, %d)", | |
4512 | target_fd, path, container_host_uid, | |
4513 | container_host_gid); | |
4514 | return log_trace(0, "Chowned %d(%s) to uid %d and %d", target_fd, path, | |
4515 | container_host_uid, container_host_gid); | |
4516 | } | |
4517 | ||
4518 | /* The container's root host id matches */ | |
4519 | if (container_host_uid == hostuid) | |
4520 | return log_info(0, "Container root id is mapped to our uid"); | |
4521 | ||
4522 | /* Get the current ids of our target. */ | |
4523 | ret = fstat(target_fd, &st); | |
4524 | if (ret) | |
4525 | return log_error_errno(-errno, errno, "Failed to stat \"%s\"", path); | |
4526 | ||
4527 | hostgid = getegid(); | |
4528 | if (st.st_uid == hostuid && mapped_hostid(st.st_gid, conf, ID_TYPE_GID) < 0) { | |
4529 | ret = fchown(target_fd, -1, hostgid); | |
4530 | if (ret) | |
4531 | return log_error_errno(-errno, errno, | |
4532 | "Failed to fchown(%d(%s), -1, %d)", | |
4533 | target_fd, path, hostgid); | |
4534 | } | |
4535 | ||
4536 | idmap = malloc(sizeof(*idmap)); | |
4537 | if (!idmap) | |
4538 | return -ENOMEM; | |
4539 | lxc_list_init(idmap); | |
4540 | ||
4541 | /* "u:0:rootuid:1" */ | |
4542 | ret = add_idmap_entry(idmap, ID_TYPE_UID, 0, container_host_uid, 1); | |
4543 | if (ret < 0) | |
4544 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
4545 | ||
4546 | /* "u:hostuid:hostuid:1" */ | |
4547 | ret = add_idmap_entry(idmap, ID_TYPE_UID, hostuid, hostuid, 1); | |
4548 | if (ret < 0) | |
4549 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
4550 | ||
4551 | /* "g:0:rootgid:1" */ | |
4552 | ret = add_idmap_entry(idmap, ID_TYPE_GID, 0, container_host_gid, 1); | |
4553 | if (ret < 0) | |
4554 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
4555 | ||
4556 | /* "g:hostgid:hostgid:1" */ | |
4557 | ret = add_idmap_entry(idmap, ID_TYPE_GID, hostgid, hostgid, 1); | |
4558 | if (ret < 0) | |
4559 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
4560 | ||
4561 | if (hostgid != st.st_gid) { | |
4562 | /* "g:pathgid:rootgid+pathgid:1" */ | |
4563 | ret = add_idmap_entry(idmap, ID_TYPE_GID, st.st_gid, | |
4564 | container_host_gid + (gid_t)st.st_gid, 1); | |
4565 | if (ret < 0) | |
4566 | return log_error_errno(ret, -ret, "Failed to add idmap entry"); | |
4567 | } | |
4568 | ||
4569 | ret = socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, sock_fds); | |
4570 | if (ret < 0) | |
4571 | return -errno; | |
4572 | ||
4573 | pid = fork(); | |
4574 | if (pid < 0) { | |
4575 | SYSERROR("Failed to create new process"); | |
4576 | goto on_error; | |
4577 | } | |
4578 | ||
4579 | if (pid == 0) { | |
4580 | close_prot_errno_disarm(sock_fds[1]); | |
4581 | ||
4582 | ret = unshare(CLONE_NEWUSER); | |
4583 | if (ret < 0) { | |
4584 | SYSERROR("Failed to unshare new user namespace"); | |
4585 | _exit(EXIT_FAILURE); | |
4586 | } | |
4587 | ||
4588 | ret = lxc_write_nointr(sock_fds[0], &c, 1); | |
4589 | if (ret != 1) | |
4590 | _exit(EXIT_FAILURE); | |
4591 | ||
4592 | ret = lxc_read_nointr(sock_fds[0], &c, 1); | |
4593 | if (ret != 1) | |
4594 | _exit(EXIT_FAILURE); | |
4595 | ||
4596 | close_prot_errno_disarm(sock_fds[0]); | |
4597 | ||
4598 | if (!lxc_switch_uid_gid(0, 0)) | |
4599 | _exit(EXIT_FAILURE); | |
4600 | ||
4601 | if (!lxc_setgroups(0, NULL)) | |
4602 | _exit(EXIT_FAILURE); | |
4603 | ||
4604 | ret = chown(path, 0, st.st_gid); | |
4605 | if (ret) { | |
4606 | SYSERROR("Failed to chown \"%s\"", path); | |
4607 | _exit(EXIT_FAILURE); | |
4608 | } | |
4609 | ||
4610 | _exit(EXIT_SUCCESS); | |
4611 | } | |
4612 | ||
4613 | close_prot_errno_disarm(sock_fds[0]); | |
4614 | ||
4615 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || | |
4616 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
4617 | struct id_map *map; | |
4618 | struct lxc_list *it; | |
4619 | ||
4620 | lxc_list_for_each(it, idmap) { | |
4621 | map = it->elem; | |
4622 | TRACE("Establishing %cid mapping for \"%d\" in new user namespace: nsuid %lu - hostid %lu - range %lu", | |
4623 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, map->nsid, map->hostid, map->range); | |
4624 | } | |
4625 | } | |
4626 | ||
4627 | ret = lxc_read_nointr(sock_fds[1], &c, 1); | |
4628 | if (ret != 1) { | |
4629 | SYSERROR("Failed waiting for child process %d\" to tell us to proceed", pid); | |
4630 | goto on_error; | |
4631 | } | |
4632 | ||
4633 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
4634 | ret = lxc_map_ids(idmap, pid); | |
4635 | if (ret < 0) { | |
4636 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); | |
4637 | goto on_error; | |
4638 | } | |
4639 | ||
4640 | /* Tell child to proceed. */ | |
4641 | ret = lxc_write_nointr(sock_fds[1], &c, 1); | |
4642 | if (ret != 1) { | |
4643 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); | |
4644 | goto on_error; | |
4645 | } | |
4646 | ||
4647 | on_error: | |
4648 | close_prot_errno_disarm(sock_fds[0]); | |
4649 | close_prot_errno_disarm(sock_fds[1]); | |
4650 | ||
4651 | /* Wait for child to finish. */ | |
4652 | if (pid < 0) | |
4653 | return -1; | |
4654 | ||
4655 | return wait_for_pid(pid); | |
4656 | } | |
4657 | ||
a96a8e8c | 4658 | /* not thread-safe, do not use from api without first forking */ |
0fd73091 | 4659 | static char *getuname(void) |
97e9cfa0 | 4660 | { |
4f410b2a | 4661 | __do_free char *buf = NULL; |
cb7aa5e8 DJ |
4662 | struct passwd pwent; |
4663 | struct passwd *pwentp = NULL; | |
cb7aa5e8 DJ |
4664 | size_t bufsize; |
4665 | int ret; | |
97e9cfa0 | 4666 | |
cb7aa5e8 DJ |
4667 | bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); |
4668 | if (bufsize == -1) | |
4669 | bufsize = 1024; | |
4670 | ||
4671 | buf = malloc(bufsize); | |
4672 | if (!buf) | |
97e9cfa0 SH |
4673 | return NULL; |
4674 | ||
cb7aa5e8 DJ |
4675 | ret = getpwuid_r(geteuid(), &pwent, buf, bufsize, &pwentp); |
4676 | if (!pwentp) { | |
4677 | if (ret == 0) | |
4678 | WARN("Could not find matched password record."); | |
4679 | ||
55022530 | 4680 | return log_error(NULL, "Failed to get password record - %u", geteuid()); |
cb7aa5e8 DJ |
4681 | } |
4682 | ||
4f410b2a | 4683 | return strdup(pwent.pw_name); |
97e9cfa0 SH |
4684 | } |
4685 | ||
a96a8e8c | 4686 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4687 | static char *getgname(void) |
4688 | { | |
4f410b2a | 4689 | __do_free char *buf = NULL; |
3de9fb4c DJ |
4690 | struct group grent; |
4691 | struct group *grentp = NULL; | |
3de9fb4c DJ |
4692 | size_t bufsize; |
4693 | int ret; | |
4694 | ||
4695 | bufsize = sysconf(_SC_GETGR_R_SIZE_MAX); | |
4696 | if (bufsize == -1) | |
4697 | bufsize = 1024; | |
4698 | ||
4699 | buf = malloc(bufsize); | |
4700 | if (!buf) | |
4701 | return NULL; | |
4702 | ||
4703 | ret = getgrgid_r(getegid(), &grent, buf, bufsize, &grentp); | |
4704 | if (!grentp) { | |
4705 | if (ret == 0) | |
4706 | WARN("Could not find matched group record"); | |
97e9cfa0 | 4707 | |
55022530 | 4708 | return log_error(NULL, "Failed to get group record - %u", getegid()); |
3de9fb4c DJ |
4709 | } |
4710 | ||
4f410b2a | 4711 | return strdup(grent.gr_name); |
97e9cfa0 SH |
4712 | } |
4713 | ||
a96a8e8c | 4714 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4715 | void suggest_default_idmap(void) |
4716 | { | |
3a6e3bf5 | 4717 | __do_free char *gname = NULL, *line = NULL, *uname = NULL; |
4aae564f | 4718 | __do_fclose FILE *subuid_f = NULL, *subgid_f = NULL; |
97e9cfa0 | 4719 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; |
97e9cfa0 SH |
4720 | size_t len = 0; |
4721 | ||
0fd73091 CB |
4722 | uname = getuname(); |
4723 | if (!uname) | |
97e9cfa0 SH |
4724 | return; |
4725 | ||
0fd73091 | 4726 | gname = getgname(); |
3a6e3bf5 | 4727 | if (!gname) |
97e9cfa0 | 4728 | return; |
97e9cfa0 | 4729 | |
4110345b | 4730 | subuid_f = fopen(subuidfile, "re"); |
4aae564f | 4731 | if (!subuid_f) { |
97e9cfa0 | 4732 | ERROR("Your system is not configured with subuids"); |
97e9cfa0 SH |
4733 | return; |
4734 | } | |
0fd73091 | 4735 | |
4aae564f | 4736 | while (getline(&line, &len, subuid_f) != -1) { |
0fd73091 | 4737 | char *p, *p2; |
b7930180 | 4738 | size_t no_newline = 0; |
0fd73091 CB |
4739 | |
4740 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4741 | if (*line == '#') |
4742 | continue; | |
4743 | if (!p) | |
4744 | continue; | |
4745 | *p = '\0'; | |
4746 | p++; | |
0fd73091 | 4747 | |
97e9cfa0 SH |
4748 | if (strcmp(line, uname)) |
4749 | continue; | |
0fd73091 | 4750 | |
97e9cfa0 SH |
4751 | p2 = strchr(p, ':'); |
4752 | if (!p2) | |
4753 | continue; | |
4754 | *p2 = '\0'; | |
4755 | p2++; | |
4756 | if (!*p2) | |
4757 | continue; | |
b7930180 CB |
4758 | no_newline = strcspn(p2, "\n"); |
4759 | p2[no_newline] = '\0'; | |
4760 | ||
b7b2fde4 | 4761 | if (lxc_safe_uint(p, &uid) < 0) |
0fd73091 | 4762 | WARN("Could not parse UID"); |
b7b2fde4 | 4763 | if (lxc_safe_uint(p2, &urange) < 0) |
0fd73091 | 4764 | WARN("Could not parse UID range"); |
97e9cfa0 | 4765 | } |
97e9cfa0 | 4766 | |
4110345b | 4767 | subgid_f = fopen(subgidfile, "re"); |
4aae564f | 4768 | if (!subgid_f) { |
97e9cfa0 | 4769 | ERROR("Your system is not configured with subgids"); |
97e9cfa0 SH |
4770 | return; |
4771 | } | |
0fd73091 | 4772 | |
4aae564f | 4773 | while (getline(&line, &len, subgid_f) != -1) { |
0fd73091 | 4774 | char *p, *p2; |
b7930180 | 4775 | size_t no_newline = 0; |
0fd73091 CB |
4776 | |
4777 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4778 | if (*line == '#') |
4779 | continue; | |
4780 | if (!p) | |
4781 | continue; | |
4782 | *p = '\0'; | |
4783 | p++; | |
0fd73091 | 4784 | |
97e9cfa0 SH |
4785 | if (strcmp(line, uname)) |
4786 | continue; | |
0fd73091 | 4787 | |
97e9cfa0 SH |
4788 | p2 = strchr(p, ':'); |
4789 | if (!p2) | |
4790 | continue; | |
4791 | *p2 = '\0'; | |
4792 | p2++; | |
4793 | if (!*p2) | |
4794 | continue; | |
b7930180 CB |
4795 | no_newline = strcspn(p2, "\n"); |
4796 | p2[no_newline] = '\0'; | |
4797 | ||
b7b2fde4 | 4798 | if (lxc_safe_uint(p, &gid) < 0) |
0fd73091 | 4799 | WARN("Could not parse GID"); |
b7b2fde4 | 4800 | if (lxc_safe_uint(p2, &grange) < 0) |
0fd73091 | 4801 | WARN("Could not parse GID range"); |
97e9cfa0 | 4802 | } |
97e9cfa0 | 4803 | |
97e9cfa0 SH |
4804 | if (!urange || !grange) { |
4805 | ERROR("You do not have subuids or subgids allocated"); | |
4806 | ERROR("Unprivileged containers require subuids and subgids"); | |
4807 | return; | |
4808 | } | |
4809 | ||
4810 | ERROR("You must either run as root, or define uid mappings"); | |
4811 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4812 | ERROR("~/.config/lxc/default.conf:"); | |
4813 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
bdcbb6b3 CB |
4814 | ERROR("lxc.idmap = u 0 %u %u", uid, urange); |
4815 | ERROR("lxc.idmap = g 0 %u %u", gid, grange); | |
97e9cfa0 | 4816 | } |
aaf26830 | 4817 | |
a7307747 SH |
4818 | static void free_cgroup_settings(struct lxc_list *result) |
4819 | { | |
4820 | struct lxc_list *iterator, *next; | |
4821 | ||
0fd73091 | 4822 | lxc_list_for_each_safe (iterator, result, next) { |
a7307747 | 4823 | lxc_list_del(iterator); |
55022530 | 4824 | free_disarm(iterator); |
a7307747 | 4825 | } |
55022530 | 4826 | free_disarm(result); |
a7307747 SH |
4827 | } |
4828 | ||
0fd73091 | 4829 | /* Return the list of cgroup_settings sorted according to the following rules |
aaf26830 KT |
4830 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes |
4831 | */ | |
0fd73091 | 4832 | struct lxc_list *sort_cgroup_settings(struct lxc_list *cgroup_settings) |
aaf26830 KT |
4833 | { |
4834 | struct lxc_list *result; | |
aaf26830 | 4835 | struct lxc_cgroup *cg = NULL; |
0fd73091 | 4836 | struct lxc_list *it = NULL, *item = NULL, *memsw_limit = NULL; |
aaf26830 KT |
4837 | |
4838 | result = malloc(sizeof(*result)); | |
0fd73091 | 4839 | if (!result) |
fac7c663 | 4840 | return NULL; |
aaf26830 KT |
4841 | lxc_list_init(result); |
4842 | ||
0fd73091 CB |
4843 | /* Iterate over the cgroup settings and copy them to the output list. */ |
4844 | lxc_list_for_each (it, cgroup_settings) { | |
aaf26830 | 4845 | item = malloc(sizeof(*item)); |
fac7c663 | 4846 | if (!item) { |
a7307747 | 4847 | free_cgroup_settings(result); |
fac7c663 KT |
4848 | return NULL; |
4849 | } | |
0fd73091 | 4850 | |
aaf26830 KT |
4851 | item->elem = it->elem; |
4852 | cg = it->elem; | |
4853 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
4854 | /* Store the memsw_limit location */ | |
4855 | memsw_limit = item; | |
0fd73091 CB |
4856 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && |
4857 | memsw_limit != NULL) { | |
4858 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found | |
4859 | * before lxc.cgroup.memory.limit_in_bytes, swap these | |
4860 | * two items */ | |
aaf26830 KT |
4861 | item->elem = memsw_limit->elem; |
4862 | memsw_limit->elem = it->elem; | |
4863 | } | |
4864 | lxc_list_add_tail(result, item); | |
4865 | } | |
4866 | ||
4867 | return result; | |
a7307747 | 4868 | } |