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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; |
ebf3a6af | 291 | int fd, ret; |
0fd73091 | 292 | struct lxc_popen_FILE *f; |
91c3830e | 293 | |
ebec9176 | 294 | f = lxc_popen(buffer); |
91c3830e | 295 | if (!f) { |
3f60c2f7 | 296 | SYSERROR("Failed to popen() %s", buffer); |
91c3830e SH |
297 | return -1; |
298 | } | |
299 | ||
300 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
301 | if (!output) { | |
3f60c2f7 | 302 | ERROR("Failed to allocate memory for %s", buffer); |
ebec9176 | 303 | lxc_pclose(f); |
91c3830e SH |
304 | return -1; |
305 | } | |
306 | ||
ebf3a6af CB |
307 | fd = fileno(f->f); |
308 | if (fd < 0) { | |
309 | SYSERROR("Failed to retrieve underlying file descriptor"); | |
310 | lxc_pclose(f); | |
311 | return -1; | |
312 | } | |
313 | ||
314 | for (int i = 0; i < 10; i++) { | |
315 | ssize_t bytes_read; | |
316 | ||
317 | bytes_read = lxc_read_nointr(fd, output, LXC_LOG_BUFFER_SIZE - 1); | |
318 | if (bytes_read > 0) { | |
319 | output[bytes_read] = '\0'; | |
320 | DEBUG("Script %s produced output: %s", buffer, output); | |
321 | continue; | |
322 | } | |
323 | ||
324 | break; | |
325 | } | |
91c3830e | 326 | |
ebec9176 | 327 | ret = lxc_pclose(f); |
8e7da691 | 328 | if (ret == -1) { |
3f60c2f7 | 329 | SYSERROR("Script exited with error"); |
91c3830e | 330 | return -1; |
8e7da691 | 331 | } else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) { |
3f60c2f7 | 332 | ERROR("Script exited with status %d", WEXITSTATUS(ret)); |
8e7da691 DE |
333 | return -1; |
334 | } else if (WIFSIGNALED(ret)) { | |
3f60c2f7 | 335 | ERROR("Script terminated by signal %d", WTERMSIG(ret)); |
8e7da691 | 336 | return -1; |
91c3830e SH |
337 | } |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
14a7b0f9 CB |
342 | int run_script_argv(const char *name, unsigned int hook_version, |
343 | const char *section, const char *script, | |
586b1ce7 | 344 | const char *hookname, char **argv) |
148e91f5 | 345 | { |
e1a94937 | 346 | __do_free char *buffer = NULL; |
3f60c2f7 | 347 | int buf_pos, i, ret; |
d08e5708 | 348 | size_t size = 0; |
148e91f5 | 349 | |
3f60c2f7 CB |
350 | if (hook_version == 0) |
351 | INFO("Executing script \"%s\" for container \"%s\", config " | |
352 | "section \"%s\"", script, name, section); | |
353 | else | |
354 | INFO("Executing script \"%s\" for container \"%s\"", script, name); | |
148e91f5 | 355 | |
586b1ce7 CB |
356 | for (i = 0; argv && argv[i]; i++) |
357 | size += strlen(argv[i]) + 1; | |
148e91f5 | 358 | |
6333c915 CB |
359 | size += STRLITERALLEN("exec"); |
360 | size++; | |
148e91f5 | 361 | size += strlen(script); |
3f60c2f7 CB |
362 | size++; |
363 | ||
148e91f5 | 364 | if (size > INT_MAX) |
3f60c2f7 | 365 | return -EFBIG; |
148e91f5 | 366 | |
3f60c2f7 | 367 | if (hook_version == 0) { |
d08e5708 CB |
368 | size += strlen(hookname); |
369 | size++; | |
370 | ||
371 | size += strlen(name); | |
372 | size++; | |
373 | ||
374 | size += strlen(section); | |
375 | size++; | |
376 | ||
377 | if (size > INT_MAX) | |
378 | return -EFBIG; | |
327cce76 | 379 | } |
3f60c2f7 | 380 | |
6f8d00d2 CB |
381 | buffer = malloc(size); |
382 | if (!buffer) | |
383 | return -ENOMEM; | |
384 | ||
327cce76 | 385 | if (hook_version == 0) |
3f60c2f7 | 386 | buf_pos = snprintf(buffer, size, "exec %s %s %s %s", script, name, section, hookname); |
327cce76 | 387 | else |
3f60c2f7 | 388 | buf_pos = snprintf(buffer, size, "exec %s", script); |
327cce76 CB |
389 | if (buf_pos < 0 || (size_t)buf_pos >= size) { |
390 | ERROR("Failed to create command line for script \"%s\"", script); | |
e1a94937 | 391 | return -1; |
327cce76 | 392 | } |
3f60c2f7 | 393 | |
327cce76 | 394 | if (hook_version == 1) { |
3f60c2f7 CB |
395 | ret = setenv("LXC_HOOK_TYPE", hookname, 1); |
396 | if (ret < 0) { | |
397 | SYSERROR("Failed to set environment variable: " | |
398 | "LXC_HOOK_TYPE=%s", hookname); | |
e1a94937 | 399 | return -1; |
3f60c2f7 | 400 | } |
90f20466 | 401 | TRACE("Set environment variable: LXC_HOOK_TYPE=%s", hookname); |
3f60c2f7 CB |
402 | |
403 | ret = setenv("LXC_HOOK_SECTION", section, 1); | |
404 | if (ret < 0) { | |
405 | SYSERROR("Failed to set environment variable: " | |
406 | "LXC_HOOK_SECTION=%s", section); | |
e1a94937 | 407 | return -1; |
3f60c2f7 CB |
408 | } |
409 | TRACE("Set environment variable: LXC_HOOK_SECTION=%s", section); | |
14a7b0f9 CB |
410 | |
411 | if (strcmp(section, "net") == 0) { | |
412 | char *parent; | |
413 | ||
586b1ce7 | 414 | if (!argv || !argv[0]) |
e1a94937 | 415 | return -1; |
14a7b0f9 | 416 | |
586b1ce7 | 417 | ret = setenv("LXC_NET_TYPE", argv[0], 1); |
14a7b0f9 CB |
418 | if (ret < 0) { |
419 | SYSERROR("Failed to set environment variable: " | |
586b1ce7 | 420 | "LXC_NET_TYPE=%s", argv[0]); |
e1a94937 | 421 | return -1; |
14a7b0f9 | 422 | } |
586b1ce7 | 423 | TRACE("Set environment variable: LXC_NET_TYPE=%s", argv[0]); |
14a7b0f9 | 424 | |
586b1ce7 | 425 | parent = argv[1] ? argv[1] : ""; |
14a7b0f9 | 426 | |
a8144263 | 427 | if (strcmp(argv[0], "macvlan") == 0) { |
14a7b0f9 CB |
428 | ret = setenv("LXC_NET_PARENT", parent, 1); |
429 | if (ret < 0) { | |
430 | SYSERROR("Failed to set environment " | |
431 | "variable: LXC_NET_PARENT=%s", parent); | |
e1a94937 | 432 | return -1; |
14a7b0f9 CB |
433 | } |
434 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
a8144263 | 435 | } else if (strcmp(argv[0], "phys") == 0) { |
14a7b0f9 CB |
436 | ret = setenv("LXC_NET_PARENT", parent, 1); |
437 | if (ret < 0) { | |
438 | SYSERROR("Failed to set environment " | |
439 | "variable: LXC_NET_PARENT=%s", parent); | |
e1a94937 | 440 | return -1; |
14a7b0f9 CB |
441 | } |
442 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
a8144263 | 443 | } else if (strcmp(argv[0], "veth") == 0) { |
586b1ce7 | 444 | char *peer = argv[2] ? argv[2] : ""; |
14a7b0f9 CB |
445 | |
446 | ret = setenv("LXC_NET_PEER", peer, 1); | |
447 | if (ret < 0) { | |
448 | SYSERROR("Failed to set environment " | |
449 | "variable: LXC_NET_PEER=%s", peer); | |
e1a94937 | 450 | return -1; |
14a7b0f9 CB |
451 | } |
452 | TRACE("Set environment variable: LXC_NET_PEER=%s", peer); | |
453 | ||
454 | ret = setenv("LXC_NET_PARENT", parent, 1); | |
455 | if (ret < 0) { | |
456 | SYSERROR("Failed to set environment " | |
457 | "variable: LXC_NET_PARENT=%s", parent); | |
e1a94937 | 458 | return -1; |
14a7b0f9 CB |
459 | } |
460 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
461 | } | |
462 | } | |
148e91f5 SH |
463 | } |
464 | ||
586b1ce7 | 465 | for (i = 0; argv && argv[i]; i++) { |
3f60c2f7 CB |
466 | size_t len = size - buf_pos; |
467 | ||
586b1ce7 | 468 | ret = snprintf(buffer + buf_pos, len, " %s", argv[i]); |
3f60c2f7 CB |
469 | if (ret < 0 || (size_t)ret >= len) { |
470 | ERROR("Failed to create command line for script \"%s\"", script); | |
e1a94937 | 471 | return -1; |
148e91f5 | 472 | } |
3f60c2f7 | 473 | buf_pos += ret; |
148e91f5 SH |
474 | } |
475 | ||
e1a94937 | 476 | return run_buffer(buffer); |
148e91f5 SH |
477 | } |
478 | ||
811ef482 | 479 | int run_script(const char *name, const char *section, const char *script, ...) |
e3b4c4c4 | 480 | { |
2f443e88 | 481 | __do_free char *buffer = NULL; |
abbfd20b | 482 | int ret; |
2f443e88 | 483 | char *p; |
abbfd20b | 484 | va_list ap; |
0fd73091 | 485 | size_t size = 0; |
751d9dcd | 486 | |
0fd73091 | 487 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\"", |
751d9dcd | 488 | script, name, section); |
e3b4c4c4 | 489 | |
abbfd20b DL |
490 | va_start(ap, script); |
491 | while ((p = va_arg(ap, char *))) | |
95642a10 | 492 | size += strlen(p) + 1; |
abbfd20b DL |
493 | va_end(ap); |
494 | ||
6333c915 | 495 | size += STRLITERALLEN("exec"); |
abbfd20b DL |
496 | size += strlen(script); |
497 | size += strlen(name); | |
498 | size += strlen(section); | |
6d1a5f93 | 499 | size += 4; |
abbfd20b | 500 | |
95642a10 MS |
501 | if (size > INT_MAX) |
502 | return -1; | |
503 | ||
2f443e88 | 504 | buffer = must_realloc(NULL, size); |
6d1a5f93 | 505 | ret = snprintf(buffer, size, "exec %s %s %s", script, name, section); |
0fd73091 | 506 | if (ret < 0 || ret >= size) |
9ba8130c | 507 | return -1; |
751d9dcd | 508 | |
abbfd20b | 509 | va_start(ap, script); |
9ba8130c | 510 | while ((p = va_arg(ap, char *))) { |
062b72c6 | 511 | int len = size - ret; |
9ba8130c SH |
512 | int rc; |
513 | rc = snprintf(buffer + ret, len, " %s", p); | |
7b5a2435 DJ |
514 | if (rc < 0 || rc >= len) { |
515 | va_end(ap); | |
9ba8130c | 516 | return -1; |
7b5a2435 | 517 | } |
9ba8130c SH |
518 | ret += rc; |
519 | } | |
abbfd20b | 520 | va_end(ap); |
751d9dcd | 521 | |
91c3830e | 522 | return run_buffer(buffer); |
e3b4c4c4 ST |
523 | } |
524 | ||
0fd73091 | 525 | /* pin_rootfs |
63fc76c3 | 526 | * if rootfs is a directory, then open ${rootfs}/.lxc-keep for writing for |
b7ed4bf0 CS |
527 | * the duration of the container run, to prevent the container from marking |
528 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
63fc76c3 GJ |
529 | * no name pollution is happens. |
530 | * don't unlink on NFS to avoid random named stale handles. | |
0c547523 SH |
531 | * return -1 on error. |
532 | * return -2 if nothing needed to be pinned. | |
533 | * return an open fd (>=0) if we pinned it. | |
534 | */ | |
535 | int pin_rootfs(const char *rootfs) | |
536 | { | |
957c4704 | 537 | __do_free char *absrootfs = NULL; |
0fd73091 | 538 | int fd, ret; |
6b5a54cd | 539 | char absrootfspin[PATH_MAX]; |
0c547523 | 540 | struct stat s; |
63fc76c3 | 541 | struct statfs sfs; |
0c547523 | 542 | |
e99ee0de | 543 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 544 | return -2; |
e99ee0de | 545 | |
74e7b662 | 546 | absrootfs = realpath(rootfs, NULL); |
547 | if (!absrootfs) | |
9be53773 | 548 | return -2; |
0c547523 | 549 | |
0fd73091 | 550 | ret = stat(absrootfs, &s); |
957c4704 | 551 | if (ret < 0) |
0c547523 | 552 | return -1; |
0c547523 | 553 | |
957c4704 | 554 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
555 | return -2; |
556 | ||
6b5a54cd | 557 | ret = snprintf(absrootfspin, PATH_MAX, "%s/.lxc-keep", absrootfs); |
6b5a54cd | 558 | if (ret < 0 || ret >= PATH_MAX) |
0c547523 | 559 | return -1; |
0c547523 | 560 | |
0fd73091 | 561 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR | S_IRUSR); |
b7ed4bf0 CS |
562 | if (fd < 0) |
563 | return fd; | |
0fd73091 | 564 | |
205fc010 CB |
565 | ret = fstatfs (fd, &sfs); |
566 | if (ret < 0) | |
567 | return fd; | |
63fc76c3 GJ |
568 | |
569 | if (sfs.f_type == NFS_SUPER_MAGIC) { | |
205fc010 | 570 | DEBUG("Rootfs on NFS, not unlinking pin file \"%s\"", absrootfspin); |
63fc76c3 GJ |
571 | return fd; |
572 | } | |
573 | ||
b7ed4bf0 | 574 | (void)unlink(absrootfspin); |
0fd73091 | 575 | |
0c547523 SH |
576 | return fd; |
577 | } | |
578 | ||
0fd73091 CB |
579 | /* If we are asking to remount something, make sure that any NOEXEC etc are |
580 | * honored. | |
e2a7e8dc | 581 | */ |
5ae72b98 | 582 | unsigned long add_required_remount_flags(const char *s, const char *d, |
5285689c | 583 | unsigned long flags) |
e2a7e8dc | 584 | { |
614305f3 | 585 | #ifdef HAVE_STATVFS |
0fd73091 | 586 | int ret; |
e2a7e8dc SH |
587 | struct statvfs sb; |
588 | unsigned long required_flags = 0; | |
589 | ||
e2a7e8dc SH |
590 | if (!s) |
591 | s = d; | |
592 | ||
593 | if (!s) | |
594 | return flags; | |
0fd73091 CB |
595 | |
596 | ret = statvfs(s, &sb); | |
597 | if (ret < 0) | |
e2a7e8dc SH |
598 | return flags; |
599 | ||
69eadddb CB |
600 | if (flags & MS_REMOUNT) { |
601 | if (sb.f_flag & MS_NOSUID) | |
602 | required_flags |= MS_NOSUID; | |
603 | if (sb.f_flag & MS_NODEV) | |
604 | required_flags |= MS_NODEV; | |
605 | if (sb.f_flag & MS_RDONLY) | |
606 | required_flags |= MS_RDONLY; | |
607 | if (sb.f_flag & MS_NOEXEC) | |
608 | required_flags |= MS_NOEXEC; | |
609 | } | |
610 | ||
611 | if (sb.f_flag & MS_NOATIME) | |
612 | required_flags |= MS_NOATIME; | |
613 | if (sb.f_flag & MS_NODIRATIME) | |
614 | required_flags |= MS_NODIRATIME; | |
615 | if (sb.f_flag & MS_LAZYTIME) | |
616 | required_flags |= MS_LAZYTIME; | |
617 | if (sb.f_flag & MS_RELATIME) | |
618 | required_flags |= MS_RELATIME; | |
619 | if (sb.f_flag & MS_STRICTATIME) | |
620 | required_flags |= MS_STRICTATIME; | |
e2a7e8dc SH |
621 | |
622 | return flags | required_flags; | |
614305f3 SH |
623 | #else |
624 | return flags; | |
625 | #endif | |
e2a7e8dc SH |
626 | } |
627 | ||
6b741397 CB |
628 | static int add_shmount_to_list(struct lxc_conf *conf) |
629 | { | |
6b5a54cd | 630 | char new_mount[PATH_MAX]; |
0d190408 | 631 | /* Offset for the leading '/' since the path_cont |
6b741397 CB |
632 | * is absolute inside the container. |
633 | */ | |
634 | int offset = 1, ret = -1; | |
0d190408 | 635 | |
6b741397 CB |
636 | ret = snprintf(new_mount, sizeof(new_mount), |
637 | "%s %s none bind,create=dir 0 0", conf->shmount.path_host, | |
638 | conf->shmount.path_cont + offset); | |
60534030 | 639 | if (ret < 0 || (size_t)ret >= sizeof(new_mount)) |
0d190408 LT |
640 | return -1; |
641 | ||
6b741397 | 642 | return add_elem_to_mount_list(new_mount, conf); |
0d190408 LT |
643 | } |
644 | ||
4fb3cba5 | 645 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 646 | { |
0fd73091 | 647 | int i, r; |
b06b8511 CS |
648 | static struct { |
649 | int match_mask; | |
650 | int match_flag; | |
651 | const char *source; | |
652 | const char *destination; | |
653 | const char *fstype; | |
654 | unsigned long flags; | |
655 | const char *options; | |
656 | } default_mounts[] = { | |
0fd73091 CB |
657 | /* Read-only bind-mounting... In older kernels, doing that |
658 | * required to do one MS_BIND mount and then | |
659 | * MS_REMOUNT|MS_RDONLY the same one. According to mount(2) | |
660 | * manpage, MS_BIND honors MS_RDONLY from kernel 2.6.26 | |
661 | * onwards. However, this apparently does not work on kernel | |
662 | * 3.8. Unfortunately, on that very same kernel, doing the same | |
663 | * trick as above doesn't seem to work either, there one needs | |
664 | * to ALSO specify MS_BIND for the remount, otherwise the | |
665 | * entire fs is remounted read-only or the mount fails because | |
666 | * it's busy... MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for | |
667 | * kernels as low as 2.6.32... | |
368bbc02 | 668 | */ |
0fd73091 | 669 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
592fd47a | 670 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
0fd73091 CB |
671 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL }, |
672 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, | |
673 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
674 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL }, | |
675 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, | |
676 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
677 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
678 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
679 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
680 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
d1c203f4 | 681 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys", "%r/sys", NULL, MS_BIND, NULL }, |
0fd73091 CB |
682 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, |
683 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
684 | { 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 }, | |
685 | { 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 }, | |
686 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 687 | }; |
368bbc02 | 688 | |
b06b8511 | 689 | for (i = 0; default_mounts[i].match_mask; i++) { |
8db92302 | 690 | __do_free char *destination = NULL, *source = NULL; |
0fd73091 CB |
691 | int saved_errno; |
692 | unsigned long mflags; | |
0fd73091 CB |
693 | if ((flags & default_mounts[i].match_mask) != default_mounts[i].match_flag) |
694 | continue; | |
695 | ||
696 | if (default_mounts[i].source) { | |
cc4fd506 | 697 | /* will act like strdup if %r is not present */ |
0fd73091 CB |
698 | source = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].source); |
699 | if (!source) | |
cc4fd506 | 700 | return -1; |
0fd73091 | 701 | } |
f24a52d5 | 702 | |
0fd73091 CB |
703 | if (!default_mounts[i].destination) { |
704 | ERROR("BUG: auto mounts destination %d was NULL", i); | |
0fd73091 CB |
705 | return -1; |
706 | } | |
707 | ||
708 | /* will act like strdup if %r is not present */ | |
709 | destination = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].destination); | |
710 | if (!destination) { | |
0fd73091 CB |
711 | return -1; |
712 | } | |
713 | ||
714 | mflags = add_required_remount_flags(source, destination, | |
715 | default_mounts[i].flags); | |
716 | r = safe_mount(source, destination, default_mounts[i].fstype, | |
717 | mflags, default_mounts[i].options, | |
718 | conf->rootfs.path ? conf->rootfs.mount : NULL); | |
719 | saved_errno = errno; | |
720 | if (r < 0 && errno == ENOENT) { | |
721 | INFO("Mount source or target for \"%s\" on \"%s\" does " | |
722 | "not exist. Skipping", source, destination); | |
723 | r = 0; | |
724 | } else if (r < 0) { | |
725 | SYSERROR("Failed to mount \"%s\" on \"%s\" with flags %lu", source, destination, mflags); | |
726 | } | |
727 | ||
0fd73091 CB |
728 | if (r < 0) { |
729 | errno = saved_errno; | |
730 | return -1; | |
368bbc02 | 731 | } |
368bbc02 CS |
732 | } |
733 | ||
b06b8511 | 734 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
735 | int cg_flags; |
736 | ||
3f69fb12 | 737 | cg_flags = flags & (LXC_AUTO_CGROUP_MASK & ~LXC_AUTO_CGROUP_FORCE); |
0fd73091 CB |
738 | /* If the type of cgroup mount was not specified, it depends on |
739 | * the container's capabilities as to what makes sense: if we | |
740 | * have CAP_SYS_ADMIN, the read-only part can be remounted | |
741 | * read-write anyway, so we may as well default to read-write; | |
742 | * then the admin will not be given a false sense of security. | |
743 | * (And if they really want mixed r/o r/w, then they can | |
744 | * explicitly specify :mixed.) OTOH, if the container lacks | |
745 | * CAP_SYS_ADMIN, do only default to :mixed, because then the | |
746 | * container can't remount it read-write. | |
747 | */ | |
0769b82a CS |
748 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { |
749 | int has_sys_admin = 0; | |
b0ee5983 CB |
750 | |
751 | if (!lxc_list_empty(&conf->keepcaps)) | |
0769b82a | 752 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); |
b0ee5983 | 753 | else |
0769b82a | 754 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); |
b0ee5983 CB |
755 | |
756 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) | |
0769b82a | 757 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; |
b0ee5983 | 758 | else |
0769b82a | 759 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; |
0769b82a | 760 | } |
0fd73091 | 761 | |
3f69fb12 | 762 | if (flags & LXC_AUTO_CGROUP_FORCE) |
0fd73091 CB |
763 | cg_flags |= LXC_AUTO_CGROUP_FORCE; |
764 | ||
2202afc9 CB |
765 | if (!handler->cgroup_ops->mount(handler->cgroup_ops, |
766 | handler, | |
767 | conf->rootfs.path ? conf->rootfs.mount : "", | |
768 | cg_flags)) { | |
0fd73091 | 769 | SYSERROR("Failed to mount \"/sys/fs/cgroup\""); |
b06b8511 | 770 | return -1; |
368bbc02 CS |
771 | } |
772 | } | |
773 | ||
0d190408 LT |
774 | if (flags & LXC_AUTO_SHMOUNTS_MASK) { |
775 | int ret = add_shmount_to_list(conf); | |
776 | if (ret < 0) { | |
777 | ERROR("Failed to add shmount entry to container config"); | |
6b741397 | 778 | return -1; |
0d190408 LT |
779 | } |
780 | } | |
781 | ||
368bbc02 | 782 | return 0; |
368bbc02 CS |
783 | } |
784 | ||
4e5440c6 | 785 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 786 | { |
0fd73091 CB |
787 | int ret; |
788 | ||
4e5440c6 DL |
789 | if (!utsname) |
790 | return 0; | |
0ad19a3f | 791 | |
0fd73091 CB |
792 | ret = sethostname(utsname->nodename, strlen(utsname->nodename)); |
793 | if (ret < 0) { | |
794 | SYSERROR("Failed to set the hostname to \"%s\"", utsname->nodename); | |
0ad19a3f | 795 | return -1; |
796 | } | |
797 | ||
0fd73091 | 798 | INFO("Set hostname to \"%s\"", utsname->nodename); |
cd54d859 | 799 | |
0ad19a3f | 800 | return 0; |
801 | } | |
802 | ||
69aa6655 DE |
803 | struct dev_symlinks { |
804 | const char *oldpath; | |
805 | const char *name; | |
806 | }; | |
807 | ||
808 | static const struct dev_symlinks dev_symlinks[] = { | |
0fd73091 CB |
809 | { "/proc/self/fd", "fd" }, |
810 | { "/proc/self/fd/0", "stdin" }, | |
811 | { "/proc/self/fd/1", "stdout" }, | |
812 | { "/proc/self/fd/2", "stderr" }, | |
69aa6655 DE |
813 | }; |
814 | ||
ed8704d0 | 815 | static int lxc_setup_dev_symlinks(const struct lxc_rootfs *rootfs) |
69aa6655 | 816 | { |
0fd73091 | 817 | int i, ret; |
6b5a54cd | 818 | char path[PATH_MAX]; |
09227be2 | 819 | struct stat s; |
69aa6655 | 820 | |
69aa6655 DE |
821 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { |
822 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
0fd73091 CB |
823 | |
824 | ret = snprintf(path, sizeof(path), "%s/dev/%s", | |
825 | rootfs->path ? rootfs->mount : "", d->name); | |
6b5a54cd | 826 | if (ret < 0 || ret >= PATH_MAX) |
69aa6655 | 827 | return -1; |
09227be2 | 828 | |
0fd73091 CB |
829 | /* Stat the path first. If we don't get an error accept it as |
830 | * is and don't try to create it | |
09227be2 | 831 | */ |
0fd73091 CB |
832 | ret = stat(path, &s); |
833 | if (ret == 0) | |
09227be2 | 834 | continue; |
09227be2 | 835 | |
69aa6655 DE |
836 | ret = symlink(d->oldpath, path); |
837 | if (ret && errno != EEXIST) { | |
0fd73091 CB |
838 | if (errno == EROFS) { |
839 | WARN("Failed to create \"%s\". Read-only filesystem", path); | |
09227be2 | 840 | } else { |
0fd73091 | 841 | SYSERROR("Failed to create \"%s\"", path); |
09227be2 MW |
842 | return -1; |
843 | } | |
69aa6655 DE |
844 | } |
845 | } | |
0fd73091 | 846 | |
69aa6655 DE |
847 | return 0; |
848 | } | |
849 | ||
2187efd3 | 850 | /* Build a space-separate list of ptys to pass to systemd. */ |
885766f5 | 851 | static bool append_ttyname(char **pp, char *name) |
b0a33c1e | 852 | { |
393903d1 | 853 | char *p; |
f1e05b90 | 854 | size_t size; |
393903d1 SH |
855 | |
856 | if (!*pp) { | |
857 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
858 | if (!*pp) | |
859 | return false; | |
0fd73091 | 860 | |
393903d1 SH |
861 | sprintf(*pp, "container_ttys=%s", name); |
862 | return true; | |
863 | } | |
0fd73091 | 864 | |
f1e05b90 DJ |
865 | size = strlen(*pp) + strlen(name) + 2; |
866 | p = realloc(*pp, size); | |
393903d1 SH |
867 | if (!p) |
868 | return false; | |
0fd73091 | 869 | |
393903d1 | 870 | *pp = p; |
f1e05b90 DJ |
871 | (void)strlcat(p, " ", size); |
872 | (void)strlcat(p, name, size); | |
0fd73091 | 873 | |
393903d1 SH |
874 | return true; |
875 | } | |
876 | ||
2187efd3 | 877 | static int lxc_setup_ttys(struct lxc_conf *conf) |
393903d1 | 878 | { |
9e1045e3 | 879 | int i, ret; |
0e4be3cf | 880 | const struct lxc_tty_info *ttys = &conf->ttys; |
885766f5 | 881 | char *ttydir = ttys->dir; |
6b5a54cd | 882 | char path[PATH_MAX], lxcpath[PATH_MAX]; |
b0a33c1e | 883 | |
e8bd4e43 | 884 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
885 | return 0; |
886 | ||
885766f5 | 887 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 888 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
b0a33c1e | 889 | |
e8bd4e43 | 890 | ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1); |
73363c61 | 891 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 892 | return -1; |
9e1045e3 | 893 | |
7c6ef2a2 SH |
894 | if (ttydir) { |
895 | /* create dev/lxc/tty%d" */ | |
9e1045e3 CB |
896 | ret = snprintf(lxcpath, sizeof(lxcpath), |
897 | "/dev/%s/tty%d", ttydir, i + 1); | |
73363c61 | 898 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
7c6ef2a2 | 899 | return -1; |
9e1045e3 | 900 | |
adc1c715 | 901 | ret = mknod(lxcpath, S_IFREG | 0000, 0); |
9e1045e3 | 902 | if (ret < 0 && errno != EEXIST) { |
73363c61 | 903 | SYSERROR("Failed to create \"%s\"", lxcpath); |
7c6ef2a2 SH |
904 | return -1; |
905 | } | |
9e1045e3 | 906 | |
7c6ef2a2 | 907 | ret = unlink(path); |
9e1045e3 | 908 | if (ret < 0 && errno != ENOENT) { |
73363c61 | 909 | SYSERROR("Failed to unlink \"%s\"", path); |
7c6ef2a2 SH |
910 | return -1; |
911 | } | |
b0a33c1e | 912 | |
2520facd | 913 | ret = mount(tty->name, lxcpath, "none", MS_BIND, 0); |
9e1045e3 | 914 | if (ret < 0) { |
adc1c715 WB |
915 | SYSWARN("Failed to bind mount \"%s\" onto \"%s\"", |
916 | tty->name, lxcpath); | |
7c6ef2a2 SH |
917 | continue; |
918 | } | |
0fd73091 | 919 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, |
adc1c715 | 920 | lxcpath); |
13954cce | 921 | |
9e1045e3 CB |
922 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", |
923 | ttydir, i + 1); | |
73363c61 | 924 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
9ba8130c | 925 | return -1; |
9e1045e3 | 926 | |
7c6ef2a2 | 927 | ret = symlink(lxcpath, path); |
9e1045e3 | 928 | if (ret < 0) { |
73363c61 | 929 | SYSERROR("Failed to create symlink \"%s\" -> \"%s\"", |
9e1045e3 | 930 | path, lxcpath); |
7c6ef2a2 SH |
931 | return -1; |
932 | } | |
933 | } else { | |
9e1045e3 CB |
934 | /* If we populated /dev, then we need to create |
935 | * /dev/ttyN | |
936 | */ | |
d3ccc04e CB |
937 | ret = mknod(path, S_IFREG | 0000, 0); |
938 | if (ret < 0) /* this isn't fatal, continue */ | |
6d1400b5 | 939 | SYSERROR("Failed to create \"%s\"", path); |
9e1045e3 | 940 | |
2520facd | 941 | ret = mount(tty->name, path, "none", MS_BIND, 0); |
9e1045e3 | 942 | if (ret < 0) { |
2520facd | 943 | SYSERROR("Failed to mount '%s'->'%s'", tty->name, path); |
7c6ef2a2 SH |
944 | continue; |
945 | } | |
9e1045e3 | 946 | |
d3ccc04e | 947 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, path); |
393903d1 | 948 | } |
9e1045e3 | 949 | |
885766f5 | 950 | if (!append_ttyname(&conf->ttys.tty_names, tty->name)) { |
393903d1 SH |
951 | ERROR("Error setting up container_ttys string"); |
952 | return -1; | |
b0a33c1e | 953 | } |
954 | } | |
955 | ||
885766f5 | 956 | INFO("Finished setting up %zu /dev/tty<N> device(s)", ttys->max); |
b0a33c1e | 957 | return 0; |
958 | } | |
959 | ||
663014ee | 960 | int lxc_allocate_ttys(struct lxc_conf *conf) |
2187efd3 | 961 | { |
fca23691 | 962 | size_t i; |
963 | int ret; | |
0fd73091 | 964 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 CB |
965 | |
966 | /* no tty in the configuration */ | |
885766f5 | 967 | if (ttys->max == 0) |
2187efd3 CB |
968 | return 0; |
969 | ||
885766f5 | 970 | ttys->tty = malloc(sizeof(*ttys->tty) * ttys->max); |
0e4be3cf | 971 | if (!ttys->tty) |
2187efd3 | 972 | return -ENOMEM; |
2187efd3 | 973 | |
885766f5 | 974 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 975 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 976 | |
386e6768 CB |
977 | tty->master = -EBADF; |
978 | tty->slave = -EBADF; | |
77a39805 CB |
979 | ret = openpty(&tty->master, &tty->slave, NULL, NULL, NULL); |
980 | if (ret < 0) { | |
fca23691 | 981 | SYSERROR("Failed to create tty %zu", i); |
885766f5 | 982 | ttys->max = i; |
0e4be3cf | 983 | lxc_delete_tty(ttys); |
2187efd3 CB |
984 | return -ENOTTY; |
985 | } | |
986 | ||
77a39805 CB |
987 | ret = ttyname_r(tty->slave, tty->name, sizeof(tty->name)); |
988 | if (ret < 0) { | |
fca23691 | 989 | SYSERROR("Failed to retrieve name of tty %zu slave", i); |
77a39805 CB |
990 | ttys->max = i; |
991 | lxc_delete_tty(ttys); | |
992 | return -ENOTTY; | |
993 | } | |
994 | ||
0fd73091 | 995 | DEBUG("Created tty \"%s\" with master fd %d and slave fd %d", |
2520facd | 996 | tty->name, tty->master, tty->slave); |
2187efd3 CB |
997 | |
998 | /* Prevent leaking the file descriptors to the container */ | |
615f24ff | 999 | ret = fd_cloexec(tty->master, true); |
2187efd3 | 1000 | if (ret < 0) |
a24c5678 | 1001 | SYSWARN("Failed to set FD_CLOEXEC flag on master fd %d of " |
1002 | "tty device \"%s\"", tty->master, tty->name); | |
2187efd3 | 1003 | |
615f24ff | 1004 | ret = fd_cloexec(tty->slave, true); |
2187efd3 | 1005 | if (ret < 0) |
a24c5678 | 1006 | SYSWARN("Failed to set FD_CLOEXEC flag on slave fd %d of " |
1007 | "tty device \"%s\"", tty->slave, tty->name); | |
2187efd3 | 1008 | |
7581d645 | 1009 | tty->busy = -1; |
2187efd3 CB |
1010 | } |
1011 | ||
885766f5 | 1012 | INFO("Finished creating %zu tty devices", ttys->max); |
2187efd3 CB |
1013 | return 0; |
1014 | } | |
1015 | ||
0e4be3cf | 1016 | void lxc_delete_tty(struct lxc_tty_info *ttys) |
2187efd3 CB |
1017 | { |
1018 | int i; | |
1019 | ||
386e6768 CB |
1020 | if (!ttys->tty) |
1021 | return; | |
1022 | ||
885766f5 | 1023 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 1024 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1025 | |
386e6768 CB |
1026 | if (tty->master >= 0) { |
1027 | close(tty->master); | |
1028 | tty->master = -EBADF; | |
1029 | } | |
1030 | ||
1031 | if (tty->slave >= 0) { | |
1032 | close(tty->slave); | |
1033 | tty->slave = -EBADF; | |
1034 | } | |
2187efd3 CB |
1035 | } |
1036 | ||
0e4be3cf CB |
1037 | free(ttys->tty); |
1038 | ttys->tty = NULL; | |
2187efd3 CB |
1039 | } |
1040 | ||
1041 | static int lxc_send_ttys_to_parent(struct lxc_handler *handler) | |
1042 | { | |
1043 | int i; | |
0fd73091 | 1044 | int ret = -1; |
2187efd3 | 1045 | struct lxc_conf *conf = handler->conf; |
0e4be3cf | 1046 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 | 1047 | int sock = handler->data_sock[0]; |
2187efd3 | 1048 | |
885766f5 | 1049 | if (ttys->max == 0) |
2187efd3 CB |
1050 | return 0; |
1051 | ||
885766f5 | 1052 | for (i = 0; i < ttys->max; i++) { |
2187efd3 | 1053 | int ttyfds[2]; |
0e4be3cf | 1054 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1055 | |
2520facd CB |
1056 | ttyfds[0] = tty->master; |
1057 | ttyfds[1] = tty->slave; | |
2187efd3 CB |
1058 | |
1059 | ret = lxc_abstract_unix_send_fds(sock, ttyfds, 2, NULL, 0); | |
1060 | if (ret < 0) | |
1061 | break; | |
1062 | ||
7d7333b3 | 1063 | TRACE("Sent tty \"%s\" with master fd %d and slave fd %d to " |
2520facd | 1064 | "parent", tty->name, tty->master, tty->slave); |
2187efd3 CB |
1065 | } |
1066 | ||
1067 | if (ret < 0) | |
6d1400b5 | 1068 | SYSERROR("Failed to send %zu ttys to parent", ttys->max); |
2187efd3 | 1069 | else |
885766f5 | 1070 | TRACE("Sent %zu ttys to parent", ttys->max); |
2187efd3 CB |
1071 | |
1072 | return ret; | |
1073 | } | |
1074 | ||
1075 | static int lxc_create_ttys(struct lxc_handler *handler) | |
1076 | { | |
1077 | int ret = -1; | |
1078 | struct lxc_conf *conf = handler->conf; | |
1079 | ||
663014ee | 1080 | ret = lxc_allocate_ttys(conf); |
2187efd3 CB |
1081 | if (ret < 0) { |
1082 | ERROR("Failed to allocate ttys"); | |
1083 | goto on_error; | |
1084 | } | |
1085 | ||
1086 | ret = lxc_send_ttys_to_parent(handler); | |
1087 | if (ret < 0) { | |
1088 | ERROR("Failed to send ttys to parent"); | |
1089 | goto on_error; | |
1090 | } | |
1091 | ||
1092 | if (!conf->is_execute) { | |
1093 | ret = lxc_setup_ttys(conf); | |
1094 | if (ret < 0) { | |
1095 | ERROR("Failed to setup ttys"); | |
1096 | goto on_error; | |
1097 | } | |
1098 | } | |
1099 | ||
885766f5 CB |
1100 | if (conf->ttys.tty_names) { |
1101 | ret = setenv("container_ttys", conf->ttys.tty_names, 1); | |
2187efd3 | 1102 | if (ret < 0) |
885766f5 | 1103 | SYSERROR("Failed to set \"container_ttys=%s\"", conf->ttys.tty_names); |
2187efd3 CB |
1104 | } |
1105 | ||
1106 | ret = 0; | |
1107 | ||
1108 | on_error: | |
0e4be3cf | 1109 | lxc_delete_tty(&conf->ttys); |
2187efd3 CB |
1110 | |
1111 | return ret; | |
1112 | } | |
1113 | ||
7133b912 CB |
1114 | /* Just create a path for /dev under $lxcpath/$name and in rootfs If we hit an |
1115 | * error, log it but don't fail yet. | |
91c3830e | 1116 | */ |
7133b912 | 1117 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, |
63012bdd | 1118 | int autodevtmpfssize, const char *lxcpath) |
91c3830e | 1119 | { |
2f443e88 | 1120 | __do_free char *path = NULL; |
91c3830e | 1121 | int ret; |
87da4ec3 | 1122 | size_t clen; |
87e0e273 | 1123 | mode_t cur_mask; |
63012bdd | 1124 | char mount_options[128]; |
91c3830e | 1125 | |
7133b912 | 1126 | INFO("Preparing \"/dev\""); |
bc6928ff | 1127 | |
14221cbb | 1128 | /* $(rootfs->mount) + "/dev/pts" + '\0' */ |
ec50007f | 1129 | clen = (rootfs->path ? strlen(rootfs->mount) : 0) + 9; |
2f443e88 | 1130 | path = must_realloc(NULL, clen); |
63012bdd CK |
1131 | sprintf(mount_options, "size=%d,mode=755", (autodevtmpfssize != 0) ? autodevtmpfssize : 500000); |
1132 | DEBUG("Using mount options: %s", mount_options); | |
bc6928ff | 1133 | |
ec50007f | 1134 | ret = snprintf(path, clen, "%s/dev", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1135 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1136 | return -1; |
bc6928ff | 1137 | |
87e0e273 CB |
1138 | cur_mask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
1139 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
1140 | if (ret < 0 && errno != EEXIST) { | |
1141 | SYSERROR("Failed to create \"/dev\" directory"); | |
1142 | ret = -errno; | |
1143 | goto reset_umask; | |
bc6928ff | 1144 | } |
87da4ec3 | 1145 | |
63012bdd CK |
1146 | ret = safe_mount("none", path, "tmpfs", 0, mount_options, |
1147 | rootfs->path ? rootfs->mount : NULL ); | |
7133b912 CB |
1148 | if (ret < 0) { |
1149 | SYSERROR("Failed to mount tmpfs on \"%s\"", path); | |
87e0e273 | 1150 | goto reset_umask; |
91c3830e | 1151 | } |
87e0e273 | 1152 | TRACE("Mounted tmpfs on \"%s\"", path); |
87da4ec3 | 1153 | |
ec50007f | 1154 | ret = snprintf(path, clen, "%s/dev/pts", rootfs->path ? rootfs->mount : ""); |
87e0e273 CB |
1155 | if (ret < 0 || (size_t)ret >= clen) { |
1156 | ret = -1; | |
1157 | goto reset_umask; | |
1158 | } | |
87da4ec3 | 1159 | |
7133b912 | 1160 | /* If we are running on a devtmpfs mapping, dev/pts may already exist. |
bc6928ff MW |
1161 | * If not, then create it and exit if that fails... |
1162 | */ | |
87e0e273 CB |
1163 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
1164 | if (ret < 0 && errno != EEXIST) { | |
1165 | SYSERROR("Failed to create directory \"%s\"", path); | |
1166 | ret = -errno; | |
1167 | goto reset_umask; | |
91c3830e SH |
1168 | } |
1169 | ||
87e0e273 CB |
1170 | ret = 0; |
1171 | ||
1172 | reset_umask: | |
1173 | (void)umask(cur_mask); | |
1174 | ||
7133b912 | 1175 | INFO("Prepared \"/dev\""); |
87e0e273 | 1176 | return ret; |
91c3830e SH |
1177 | } |
1178 | ||
5e73416f | 1179 | struct lxc_device_node { |
74a3920a | 1180 | const char *name; |
5e73416f CB |
1181 | const mode_t mode; |
1182 | const int maj; | |
1183 | const int min; | |
c6883f38 SH |
1184 | }; |
1185 | ||
5e73416f | 1186 | static const struct lxc_device_node lxc_devices[] = { |
06749971 | 1187 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, |
5e73416f | 1188 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
06749971 CB |
1189 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, |
1190 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
5e73416f CB |
1191 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, |
1192 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
c6883f38 SH |
1193 | }; |
1194 | ||
5067e4dd CB |
1195 | |
1196 | enum { | |
1197 | LXC_DEVNODE_BIND, | |
1198 | LXC_DEVNODE_MKNOD, | |
1199 | LXC_DEVNODE_PARTIAL, | |
1200 | LXC_DEVNODE_OPEN, | |
1201 | }; | |
1202 | ||
27245ff7 | 1203 | static int lxc_fill_autodev(const struct lxc_rootfs *rootfs) |
c6883f38 | 1204 | { |
5e73416f | 1205 | int i, ret; |
6b5a54cd | 1206 | char path[PATH_MAX]; |
3a32201c | 1207 | mode_t cmask; |
5067e4dd | 1208 | int use_mknod = LXC_DEVNODE_MKNOD; |
c6883f38 | 1209 | |
6b5a54cd | 1210 | ret = snprintf(path, PATH_MAX, "%s/dev", |
3999be0a | 1211 | rootfs->path ? rootfs->mount : ""); |
6b5a54cd | 1212 | if (ret < 0 || ret >= PATH_MAX) |
c6883f38 | 1213 | return -1; |
91c3830e | 1214 | |
0bbf8572 CB |
1215 | /* ignore, just don't try to fill in */ |
1216 | if (!dir_exists(path)) | |
9cb4d183 SH |
1217 | return 0; |
1218 | ||
3999be0a CB |
1219 | INFO("Populating \"/dev\""); |
1220 | ||
3a32201c | 1221 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
5e73416f | 1222 | for (i = 0; i < sizeof(lxc_devices) / sizeof(lxc_devices[0]); i++) { |
6b5a54cd | 1223 | char hostpath[PATH_MAX]; |
5e73416f | 1224 | const struct lxc_device_node *device = &lxc_devices[i]; |
0728ebf4 | 1225 | |
6b5a54cd | 1226 | ret = snprintf(path, PATH_MAX, "%s/dev/%s", |
5e73416f | 1227 | rootfs->path ? rootfs->mount : "", device->name); |
6b5a54cd | 1228 | if (ret < 0 || ret >= PATH_MAX) |
c6883f38 | 1229 | return -1; |
0bbf8572 | 1230 | |
5067e4dd | 1231 | if (use_mknod >= LXC_DEVNODE_MKNOD) { |
5e73416f CB |
1232 | ret = mknod(path, device->mode, makedev(device->maj, device->min)); |
1233 | if (ret == 0 || (ret < 0 && errno == EEXIST)) { | |
1234 | DEBUG("Created device node \"%s\"", path); | |
5067e4dd CB |
1235 | } else if (ret < 0) { |
1236 | if (errno != EPERM) { | |
1237 | SYSERROR("Failed to create device node \"%s\"", path); | |
1238 | return -1; | |
1239 | } | |
0bbf8572 | 1240 | |
5067e4dd | 1241 | use_mknod = LXC_DEVNODE_BIND; |
9cb4d183 | 1242 | } |
3999be0a | 1243 | |
5067e4dd CB |
1244 | /* Device nodes are fully useable. */ |
1245 | if (use_mknod == LXC_DEVNODE_OPEN) | |
1246 | continue; | |
1247 | ||
1248 | if (use_mknod == LXC_DEVNODE_MKNOD) { | |
1249 | /* See | |
1250 | * - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=55956b59df336f6738da916dbb520b6e37df9fbd | |
1251 | * - https://lists.linuxfoundation.org/pipermail/containers/2018-June/039176.html | |
1252 | */ | |
1253 | ret = open(path, O_RDONLY | O_CLOEXEC); | |
1254 | if (ret >= 0) { | |
ae2a3d81 | 1255 | close_prot_errno_disarm(ret); |
5067e4dd CB |
1256 | /* Device nodes are fully useable. */ |
1257 | use_mknod = LXC_DEVNODE_OPEN; | |
1258 | continue; | |
1259 | } | |
1260 | ||
1261 | SYSTRACE("Failed to open \"%s\" device", path); | |
1262 | /* Device nodes are only partially useable. */ | |
1263 | use_mknod = LXC_DEVNODE_PARTIAL; | |
1264 | } | |
5e73416f CB |
1265 | } |
1266 | ||
5067e4dd CB |
1267 | if (use_mknod != LXC_DEVNODE_PARTIAL) { |
1268 | /* If we are dealing with partially functional device | |
1269 | * nodes the prio mknod() call will have created the | |
1270 | * device node so we can use it as a bind-mount target. | |
1271 | */ | |
1272 | ret = mknod(path, S_IFREG | 0000, 0); | |
1273 | if (ret < 0 && errno != EEXIST) { | |
1274 | SYSERROR("Failed to create file \"%s\"", path); | |
1275 | return -1; | |
1276 | } | |
5e73416f CB |
1277 | } |
1278 | ||
1279 | /* Fallback to bind-mounting the device from the host. */ | |
6b5a54cd CB |
1280 | ret = snprintf(hostpath, PATH_MAX, "/dev/%s", device->name); |
1281 | if (ret < 0 || ret >= PATH_MAX) | |
5e73416f CB |
1282 | return -1; |
1283 | ||
1284 | ret = safe_mount(hostpath, path, 0, MS_BIND, NULL, | |
1285 | rootfs->path ? rootfs->mount : NULL); | |
1286 | if (ret < 0) { | |
1287 | SYSERROR("Failed to bind mount host device node \"%s\" " | |
1288 | "onto \"%s\"", hostpath, path); | |
1289 | return -1; | |
c6883f38 | 1290 | } |
5e73416f CB |
1291 | DEBUG("Bind mounted host device node \"%s\" onto \"%s\"", |
1292 | hostpath, path); | |
c6883f38 | 1293 | } |
5e73416f | 1294 | (void)umask(cmask); |
c6883f38 | 1295 | |
3999be0a | 1296 | INFO("Populated \"/dev\""); |
c6883f38 SH |
1297 | return 0; |
1298 | } | |
1299 | ||
8ce1abc2 | 1300 | static int lxc_mount_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1301 | { |
9aa76a17 | 1302 | int ret; |
10bc1861 | 1303 | struct lxc_storage *bdev; |
8ce1abc2 | 1304 | const struct lxc_rootfs *rootfs = &conf->rootfs; |
cc28d0b0 | 1305 | |
a0f379bf | 1306 | if (!rootfs->path) { |
0fd73091 CB |
1307 | ret = mount("", "/", NULL, MS_SLAVE | MS_REC, 0); |
1308 | if (ret < 0) { | |
8ce1abc2 | 1309 | SYSERROR("Failed to remount \"/\" MS_REC | MS_SLAVE"); |
a0f379bf DW |
1310 | return -1; |
1311 | } | |
0fd73091 | 1312 | |
c69bd12f | 1313 | return 0; |
a0f379bf | 1314 | } |
0ad19a3f | 1315 | |
0fd73091 CB |
1316 | ret = access(rootfs->mount, F_OK); |
1317 | if (ret != 0) { | |
1318 | SYSERROR("Failed to access to \"%s\". Check it is present", | |
12297168 | 1319 | rootfs->mount); |
b1789442 DL |
1320 | return -1; |
1321 | } | |
1322 | ||
8a388ed4 | 1323 | bdev = storage_init(conf); |
9aa76a17 | 1324 | if (!bdev) { |
0fd73091 | 1325 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1326 | rootfs->path, rootfs->mount, |
1327 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1328 | return -1; |
9be53773 | 1329 | } |
9aa76a17 CB |
1330 | |
1331 | ret = bdev->ops->mount(bdev); | |
10bc1861 | 1332 | storage_put(bdev); |
9aa76a17 | 1333 | if (ret < 0) { |
0fd73091 | 1334 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1335 | rootfs->path, rootfs->mount, |
1336 | rootfs->options ? rootfs->options : "(null)"); | |
c3f0a28c | 1337 | return -1; |
1338 | } | |
0ad19a3f | 1339 | |
0fd73091 | 1340 | DEBUG("Mounted rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1341 | rootfs->path, rootfs->mount, |
1342 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1343 | |
ac778708 DL |
1344 | return 0; |
1345 | } | |
1346 | ||
8ce1abc2 | 1347 | int lxc_chroot(const struct lxc_rootfs *rootfs) |
91e93c71 | 1348 | { |
b8d88764 | 1349 | __do_free char *nroot = NULL; |
0fd73091 | 1350 | int i, ret; |
8ce1abc2 | 1351 | char *root = rootfs->mount; |
91e93c71 | 1352 | |
74e7b662 | 1353 | nroot = realpath(root, NULL); |
1354 | if (!nroot) { | |
8ce1abc2 | 1355 | SYSERROR("Failed to resolve \"%s\"", root); |
0fd73091 | 1356 | return -1; |
8ce1abc2 | 1357 | } |
91e93c71 | 1358 | |
0fd73091 | 1359 | ret = chdir("/"); |
b8d88764 | 1360 | if (ret < 0) |
0fd73091 | 1361 | return -1; |
91e93c71 | 1362 | |
0fd73091 CB |
1363 | /* We could use here MS_MOVE, but in userns this mount is locked and |
1364 | * can't be moved. | |
91e93c71 | 1365 | */ |
8ce1abc2 | 1366 | ret = mount(nroot, "/", NULL, MS_REC | MS_BIND, NULL); |
0fd73091 | 1367 | if (ret < 0) { |
8ce1abc2 | 1368 | SYSERROR("Failed to mount \"%s\" onto \"/\" as MS_REC | MS_BIND", nroot); |
0fd73091 | 1369 | return -1; |
91e93c71 AV |
1370 | } |
1371 | ||
0fd73091 CB |
1372 | ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL); |
1373 | if (ret < 0) { | |
8ce1abc2 | 1374 | SYSERROR("Failed to remount \"/\""); |
0fd73091 | 1375 | return -1; |
91e93c71 AV |
1376 | } |
1377 | ||
aa899945 | 1378 | /* The following code cleans up inherited mounts which are not required |
0fd73091 | 1379 | * for CT. |
91e93c71 AV |
1380 | * |
1381 | * The mountinfo file shows not all mounts, if a few points have been | |
1382 | * unmounted between read operations from the mountinfo. So we need to | |
1383 | * read mountinfo a few times. | |
1384 | * | |
7ded5fa7 | 1385 | * This loop can be skipped if a container uses userns, because all |
91e93c71 AV |
1386 | * inherited mounts are locked and we should live with all this trash. |
1387 | */ | |
0fd73091 | 1388 | for (;;) { |
4fdd1f72 | 1389 | __do_fclose FILE *f = NULL; |
f3d38164 CB |
1390 | __do_free char *line = NULL; |
1391 | char *slider1, *slider2; | |
91e93c71 | 1392 | int progress = 0; |
f3d38164 | 1393 | size_t len = 0; |
91e93c71 | 1394 | |
4110345b | 1395 | f = fopen("./proc/self/mountinfo", "re"); |
91e93c71 | 1396 | if (!f) { |
8ce1abc2 | 1397 | SYSERROR("Failed to open \"/proc/self/mountinfo\""); |
91e93c71 AV |
1398 | return -1; |
1399 | } | |
0fd73091 | 1400 | |
f3d38164 CB |
1401 | while (getline(&line, &len, f) > 0) { |
1402 | for (slider1 = line, i = 0; slider1 && i < 4; i++) | |
1403 | slider1 = strchr(slider1 + 1, ' '); | |
0fd73091 | 1404 | |
f3d38164 | 1405 | if (!slider1) |
91e93c71 | 1406 | continue; |
0fd73091 | 1407 | |
f3d38164 CB |
1408 | slider2 = strchr(slider1 + 1, ' '); |
1409 | if (!slider2) | |
91e93c71 AV |
1410 | continue; |
1411 | ||
f3d38164 CB |
1412 | *slider2 = '\0'; |
1413 | *slider1 = '.'; | |
91e93c71 | 1414 | |
f3d38164 | 1415 | if (strcmp(slider1 + 1, "/") == 0) |
91e93c71 | 1416 | continue; |
0fd73091 | 1417 | |
f3d38164 | 1418 | if (strcmp(slider1 + 1, "/proc") == 0) |
91e93c71 AV |
1419 | continue; |
1420 | ||
f3d38164 | 1421 | ret = umount2(slider1, MNT_DETACH); |
0fd73091 | 1422 | if (ret == 0) |
91e93c71 AV |
1423 | progress++; |
1424 | } | |
0fd73091 | 1425 | |
91e93c71 AV |
1426 | if (!progress) |
1427 | break; | |
1428 | } | |
1429 | ||
7ded5fa7 | 1430 | /* This also can be skipped if a container uses userns. */ |
0fd73091 | 1431 | (void)umount2("./proc", MNT_DETACH); |
91e93c71 AV |
1432 | |
1433 | /* It is weird, but chdir("..") moves us in a new root */ | |
0fd73091 CB |
1434 | ret = chdir(".."); |
1435 | if (ret < 0) { | |
8ce1abc2 | 1436 | SYSERROR("Failed to chdir(\"..\")"); |
91e93c71 AV |
1437 | return -1; |
1438 | } | |
1439 | ||
0fd73091 CB |
1440 | ret = chroot("."); |
1441 | if (ret < 0) { | |
8ce1abc2 | 1442 | SYSERROR("Failed to chroot(\".\")"); |
91e93c71 AV |
1443 | return -1; |
1444 | } | |
1445 | ||
1446 | return 0; | |
1447 | } | |
1448 | ||
8ce1abc2 CB |
1449 | /* (The following explanation is copied verbatim from the kernel.) |
1450 | * | |
1451 | * pivot_root Semantics: | |
1452 | * Moves the root file system of the current process to the directory put_old, | |
1453 | * makes new_root as the new root file system of the current process, and sets | |
1454 | * root/cwd of all processes which had them on the current root to new_root. | |
1455 | * | |
1456 | * Restrictions: | |
1457 | * The new_root and put_old must be directories, and must not be on the | |
1458 | * same file system as the current process root. The put_old must be | |
1459 | * underneath new_root, i.e. adding a non-zero number of /.. to the string | |
1460 | * pointed to by put_old must yield the same directory as new_root. No other | |
1461 | * file system may be mounted on put_old. After all, new_root is a mountpoint. | |
1462 | * | |
1463 | * Also, the current root cannot be on the 'rootfs' (initial ramfs) filesystem. | |
1464 | * See Documentation/filesystems/ramfs-rootfs-initramfs.txt for alternatives | |
1465 | * in this situation. | |
1466 | * | |
1467 | * Notes: | |
1468 | * - we don't move root/cwd if they are not at the root (reason: if something | |
1469 | * cared enough to change them, it's probably wrong to force them elsewhere) | |
1470 | * - it's okay to pick a root that isn't the root of a file system, e.g. | |
1471 | * /nfs/my_root where /nfs is the mount point. It must be a mountpoint, | |
1472 | * though, so you may need to say mount --bind /nfs/my_root /nfs/my_root | |
1473 | * first. | |
1474 | */ | |
1475 | static int lxc_pivot_root(const char *rootfs) | |
ac778708 | 1476 | { |
b0d7aac4 CB |
1477 | __do_close_prot_errno int oldroot = -EBADF, newroot = -EBADF; |
1478 | int ret; | |
0fd73091 | 1479 | |
7806ebd7 | 1480 | oldroot = open("/", O_DIRECTORY | O_RDONLY | O_CLOEXEC); |
8ce1abc2 CB |
1481 | if (oldroot < 0) { |
1482 | SYSERROR("Failed to open old root directory"); | |
1483 | return -1; | |
39c7b795 | 1484 | } |
ac778708 | 1485 | |
7806ebd7 | 1486 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY | O_CLOEXEC); |
8ce1abc2 CB |
1487 | if (newroot < 0) { |
1488 | SYSERROR("Failed to open new root directory"); | |
b0d7aac4 | 1489 | return -1; |
8ce1abc2 | 1490 | } |
0fd73091 | 1491 | |
8ce1abc2 CB |
1492 | /* change into new root fs */ |
1493 | ret = fchdir(newroot); | |
1494 | if (ret < 0) { | |
8ce1abc2 | 1495 | SYSERROR("Failed to change to new rootfs \"%s\"", rootfs); |
b0d7aac4 | 1496 | return -1; |
8ce1abc2 | 1497 | } |
39c7b795 | 1498 | |
8ce1abc2 CB |
1499 | /* pivot_root into our new root fs */ |
1500 | ret = pivot_root(".", "."); | |
1501 | if (ret < 0) { | |
8ce1abc2 | 1502 | SYSERROR("Failed to pivot_root()"); |
b0d7aac4 | 1503 | return -1; |
39c7b795 CB |
1504 | } |
1505 | ||
8ce1abc2 CB |
1506 | /* At this point the old-root is mounted on top of our new-root. To |
1507 | * unmounted it we must not be chdir'd into it, so escape back to | |
1508 | * old-root. | |
1509 | */ | |
1510 | ret = fchdir(oldroot); | |
0fd73091 | 1511 | if (ret < 0) { |
8ce1abc2 | 1512 | SYSERROR("Failed to enter old root directory"); |
b0d7aac4 | 1513 | return -1; |
c69bd12f DL |
1514 | } |
1515 | ||
8ce1abc2 CB |
1516 | /* Make oldroot rslave to make sure our umounts don't propagate to the |
1517 | * host. | |
1518 | */ | |
1519 | ret = mount("", ".", "", MS_SLAVE | MS_REC, NULL); | |
1520 | if (ret < 0) { | |
8ce1abc2 | 1521 | SYSERROR("Failed to make oldroot rslave"); |
b0d7aac4 | 1522 | return -1; |
8ce1abc2 CB |
1523 | } |
1524 | ||
1525 | ret = umount2(".", MNT_DETACH); | |
1526 | if (ret < 0) { | |
8ce1abc2 | 1527 | SYSERROR("Failed to detach old root directory"); |
b0d7aac4 | 1528 | return -1; |
8ce1abc2 CB |
1529 | } |
1530 | ||
1531 | ret = fchdir(newroot); | |
1532 | if (ret < 0) { | |
8ce1abc2 | 1533 | SYSERROR("Failed to re-enter new root directory"); |
b0d7aac4 | 1534 | return -1; |
8ce1abc2 CB |
1535 | } |
1536 | ||
8ce1abc2 CB |
1537 | TRACE("pivot_root(\"%s\") successful", rootfs); |
1538 | ||
b0d7aac4 | 1539 | return 0; |
0ad19a3f | 1540 | } |
1541 | ||
8ce1abc2 CB |
1542 | static int lxc_setup_rootfs_switch_root(const struct lxc_rootfs *rootfs) |
1543 | { | |
1544 | if (!rootfs->path) { | |
1545 | DEBUG("Container does not have a rootfs"); | |
1546 | return 0; | |
1547 | } | |
1548 | ||
1549 | if (detect_ramfs_rootfs()) | |
1550 | return lxc_chroot(rootfs); | |
1551 | ||
1552 | return lxc_pivot_root(rootfs->mount); | |
0ad19a3f | 1553 | } |
1554 | ||
8ce1abc2 CB |
1555 | static const struct id_map *find_mapped_nsid_entry(struct lxc_conf *conf, |
1556 | unsigned id, | |
1557 | enum idtype idtype) | |
f4900711 CB |
1558 | { |
1559 | struct lxc_list *it; | |
1560 | struct id_map *map; | |
1561 | struct id_map *retmap = NULL; | |
1562 | ||
dcf0ffdf CB |
1563 | /* Shortcut for container's root mappings. */ |
1564 | if (id == 0) { | |
1565 | if (idtype == ID_TYPE_UID) | |
1566 | return conf->root_nsuid_map; | |
1567 | ||
1568 | if (idtype == ID_TYPE_GID) | |
1569 | return conf->root_nsgid_map; | |
1570 | } | |
1571 | ||
f4900711 CB |
1572 | lxc_list_for_each(it, &conf->id_map) { |
1573 | map = it->elem; | |
1574 | if (map->idtype != idtype) | |
1575 | continue; | |
1576 | ||
1577 | if (id >= map->nsid && id < map->nsid + map->range) { | |
1578 | retmap = map; | |
1579 | break; | |
1580 | } | |
1581 | } | |
1582 | ||
1583 | return retmap; | |
1584 | } | |
1585 | ||
1586 | static int lxc_setup_devpts(struct lxc_conf *conf) | |
3c26f34e | 1587 | { |
70761e5e | 1588 | int ret; |
ce155c60 | 1589 | char **opts; |
9d28c4f9 | 1590 | char devpts_mntopts[256]; |
ce155c60 CB |
1591 | char *mntopt_sets[5]; |
1592 | char default_devpts_mntopts[256] = "gid=5,newinstance,ptmxmode=0666,mode=0620"; | |
77890c6d | 1593 | |
e528c735 | 1594 | if (conf->pty_max <= 0) { |
0fd73091 | 1595 | DEBUG("No new devpts instance will be mounted since no pts " |
70761e5e | 1596 | "devices are requested"); |
d852c78c | 1597 | return 0; |
3c26f34e | 1598 | } |
1599 | ||
e528c735 CB |
1600 | ret = snprintf(devpts_mntopts, sizeof(devpts_mntopts), "%s,max=%zu", |
1601 | default_devpts_mntopts, conf->pty_max); | |
9d28c4f9 CB |
1602 | if (ret < 0 || (size_t)ret >= sizeof(devpts_mntopts)) |
1603 | return -1; | |
1604 | ||
29a7b484 | 1605 | (void)umount2("/dev/pts", MNT_DETACH); |
7e40254a | 1606 | |
70761e5e CB |
1607 | /* Create mountpoint for devpts instance. */ |
1608 | ret = mkdir("/dev/pts", 0755); | |
1609 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1610 | SYSERROR("Failed to create \"/dev/pts\" directory"); |
3c26f34e | 1611 | return -1; |
1612 | } | |
1613 | ||
ce155c60 CB |
1614 | /* gid=5 && max= */ |
1615 | mntopt_sets[0] = devpts_mntopts; | |
dfbd4730 | 1616 | |
ce155c60 | 1617 | /* !gid=5 && max= */ |
6333c915 | 1618 | mntopt_sets[1] = devpts_mntopts + STRLITERALLEN("gid=5") + 1; |
ce155c60 CB |
1619 | |
1620 | /* gid=5 && !max= */ | |
1621 | mntopt_sets[2] = default_devpts_mntopts; | |
1622 | ||
1623 | /* !gid=5 && !max= */ | |
6333c915 | 1624 | mntopt_sets[3] = default_devpts_mntopts + STRLITERALLEN("gid=5") + 1; |
ce155c60 CB |
1625 | |
1626 | /* end */ | |
1627 | mntopt_sets[4] = NULL; | |
1628 | ||
1629 | for (ret = -1, opts = mntopt_sets; opts && *opts; opts++) { | |
1630 | /* mount new devpts instance */ | |
1631 | ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, *opts); | |
1632 | if (ret == 0) | |
1633 | break; | |
1634 | } | |
1635 | ||
1636 | if (ret < 0) { | |
1637 | SYSERROR("Failed to mount new devpts instance"); | |
1638 | return -1; | |
70761e5e | 1639 | } |
ce155c60 | 1640 | DEBUG("Mount new devpts instance with options \"%s\"", *opts); |
70761e5e | 1641 | |
d5cb35d6 | 1642 | /* Remove any pre-existing /dev/ptmx file. */ |
b29e05d6 CB |
1643 | ret = remove("/dev/ptmx"); |
1644 | if (ret < 0) { | |
1645 | if (errno != ENOENT) { | |
0fd73091 | 1646 | SYSERROR("Failed to remove existing \"/dev/ptmx\" file"); |
d5cb35d6 | 1647 | return -1; |
70761e5e | 1648 | } |
b29e05d6 | 1649 | } else { |
0fd73091 | 1650 | DEBUG("Removed existing \"/dev/ptmx\" file"); |
3c26f34e | 1651 | } |
1652 | ||
d5cb35d6 | 1653 | /* Create dummy /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
3b7e332f CB |
1654 | ret = mknod("/dev/ptmx", S_IFREG | 0000, 0); |
1655 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1656 | SYSERROR("Failed to create dummy \"/dev/ptmx\" file as bind mount target"); |
d5cb35d6 CB |
1657 | return -1; |
1658 | } | |
0fd73091 | 1659 | DEBUG("Created dummy \"/dev/ptmx\" file as bind mount target"); |
77890c6d | 1660 | |
d5cb35d6 | 1661 | /* Fallback option: create symlink /dev/ptmx -> /dev/pts/ptmx */ |
e87bd19c | 1662 | ret = mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL); |
d5cb35d6 | 1663 | if (!ret) { |
0fd73091 | 1664 | DEBUG("Bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1665 | return 0; |
1666 | } else { | |
1667 | /* Fallthrough and try to create a symlink. */ | |
0fd73091 | 1668 | ERROR("Failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1669 | } |
1670 | ||
1671 | /* Remove the dummy /dev/ptmx file we created above. */ | |
1672 | ret = remove("/dev/ptmx"); | |
70761e5e | 1673 | if (ret < 0) { |
0fd73091 | 1674 | SYSERROR("Failed to remove existing \"/dev/ptmx\""); |
d5cb35d6 CB |
1675 | return -1; |
1676 | } | |
1677 | ||
1678 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
1679 | ret = symlink("/dev/pts/ptmx", "/dev/ptmx"); | |
1680 | if (ret < 0) { | |
0fd73091 | 1681 | SYSERROR("Failed to create symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
3c26f34e | 1682 | return -1; |
1683 | } | |
0fd73091 | 1684 | DEBUG("Created symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
cd54d859 | 1685 | |
3c26f34e | 1686 | return 0; |
1687 | } | |
1688 | ||
cccc74b5 DL |
1689 | static int setup_personality(int persona) |
1690 | { | |
0fd73091 CB |
1691 | int ret; |
1692 | ||
1693 | #if HAVE_SYS_PERSONALITY_H | |
cccc74b5 DL |
1694 | if (persona == -1) |
1695 | return 0; | |
1696 | ||
0fd73091 CB |
1697 | ret = personality(persona); |
1698 | if (ret < 0) { | |
1699 | SYSERROR("Failed to set personality to \"0x%x\"", persona); | |
cccc74b5 DL |
1700 | return -1; |
1701 | } | |
1702 | ||
0fd73091 CB |
1703 | INFO("Set personality to \"0x%x\"", persona); |
1704 | #endif | |
cccc74b5 DL |
1705 | |
1706 | return 0; | |
1707 | } | |
1708 | ||
3d7d929a | 1709 | static int lxc_setup_dev_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1710 | const struct lxc_terminal *console) |
6e590161 | 1711 | { |
882671aa | 1712 | int ret; |
6b5a54cd | 1713 | char path[PATH_MAX]; |
86530b0a | 1714 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
52e35957 | 1715 | |
8b1b1210 CB |
1716 | if (console->path && !strcmp(console->path, "none")) |
1717 | return 0; | |
1718 | ||
86530b0a | 1719 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3d7d929a | 1720 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1721 | return -1; |
52e35957 | 1722 | |
8b1b1210 CB |
1723 | /* When we are asked to setup a console we remove any previous |
1724 | * /dev/console bind-mounts. | |
1725 | */ | |
a7ba3c7f CB |
1726 | if (file_exists(path)) { |
1727 | ret = lxc_unstack_mountpoint(path, false); | |
1728 | if (ret < 0) { | |
6d1400b5 | 1729 | SYSERROR("Failed to unmount \"%s\"", path); |
a7ba3c7f CB |
1730 | return -ret; |
1731 | } else { | |
86530b0a | 1732 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1733 | } |
8b1b1210 CB |
1734 | } |
1735 | ||
1736 | /* For unprivileged containers autodev or automounts will already have | |
1737 | * taken care of creating /dev/console. | |
1738 | */ | |
882671aa | 1739 | ret = mknod(path, S_IFREG | 0000, 0); |
3b7e332f CB |
1740 | if (ret < 0 && errno != EEXIST) { |
1741 | SYSERROR("Failed to create console"); | |
1742 | return -errno; | |
52e35957 DL |
1743 | } |
1744 | ||
e581b9b5 | 1745 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP); |
86530b0a | 1746 | if (ret < 0) { |
0fd73091 | 1747 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
e581b9b5 | 1748 | S_IXUSR | S_IXGRP, console->name); |
3d7d929a | 1749 | return -errno; |
63376d7d | 1750 | } |
13954cce | 1751 | |
86530b0a L |
1752 | ret = safe_mount(console->name, path, "none", MS_BIND, 0, rootfs_path); |
1753 | if (ret < 0) { | |
0fd73091 | 1754 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, path); |
6e590161 | 1755 | return -1; |
1756 | } | |
1757 | ||
86530b0a | 1758 | DEBUG("Mounted pts device \"%s\" onto \"%s\"", console->name, path); |
7c6ef2a2 SH |
1759 | return 0; |
1760 | } | |
1761 | ||
3d7d929a | 1762 | static int lxc_setup_ttydir_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1763 | const struct lxc_terminal *console, |
3d7d929a | 1764 | char *ttydir) |
7c6ef2a2 | 1765 | { |
3b7e332f | 1766 | int ret; |
6b5a54cd | 1767 | char path[PATH_MAX], lxcpath[PATH_MAX]; |
86530b0a | 1768 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
7c6ef2a2 | 1769 | |
3dc035f1 L |
1770 | if (console->path && !strcmp(console->path, "none")) |
1771 | return 0; | |
1772 | ||
7c6ef2a2 | 1773 | /* create rootfs/dev/<ttydir> directory */ |
86530b0a | 1774 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs_path, ttydir); |
3d7d929a | 1775 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1776 | return -1; |
3d7d929a | 1777 | |
7c6ef2a2 SH |
1778 | ret = mkdir(path, 0755); |
1779 | if (ret && errno != EEXIST) { | |
0fd73091 | 1780 | SYSERROR("Failed to create \"%s\"", path); |
3d7d929a | 1781 | return -errno; |
7c6ef2a2 | 1782 | } |
4742cd9a | 1783 | DEBUG("Created directory for console and tty devices at \"%s\"", path); |
7c6ef2a2 | 1784 | |
86530b0a | 1785 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", rootfs_path, ttydir); |
3d7d929a CB |
1786 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
1787 | return -1; | |
1788 | ||
3b7e332f CB |
1789 | ret = mknod(lxcpath, S_IFREG | 0000, 0); |
1790 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1791 | SYSERROR("Failed to create \"%s\"", lxcpath); |
3d7d929a | 1792 | return -errno; |
7c6ef2a2 | 1793 | } |
7c6ef2a2 | 1794 | |
86530b0a | 1795 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3dc035f1 | 1796 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1797 | return -1; |
2a12fefd | 1798 | |
3dc035f1 | 1799 | if (file_exists(path)) { |
a7ba3c7f | 1800 | ret = lxc_unstack_mountpoint(path, false); |
2a12fefd | 1801 | if (ret < 0) { |
6d1400b5 | 1802 | SYSERROR("Failed to unmount \"%s\"", path); |
a7ba3c7f CB |
1803 | return -ret; |
1804 | } else { | |
86530b0a | 1805 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1806 | } |
3dc035f1 | 1807 | } |
2a12fefd | 1808 | |
3b7e332f CB |
1809 | ret = mknod(path, S_IFREG | 0000, 0); |
1810 | if (ret < 0 && errno != EEXIST) { | |
1811 | SYSERROR("Failed to create console"); | |
1812 | return -errno; | |
7c6ef2a2 SH |
1813 | } |
1814 | ||
e581b9b5 | 1815 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP); |
86530b0a | 1816 | if (ret < 0) { |
0fd73091 | 1817 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
e581b9b5 | 1818 | S_IXUSR | S_IXGRP, console->name); |
2a12fefd CB |
1819 | return -errno; |
1820 | } | |
1821 | ||
3dc035f1 | 1822 | /* bind mount console->name to '/dev/<ttydir>/console' */ |
86530b0a L |
1823 | ret = safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs_path); |
1824 | if (ret < 0) { | |
0fd73091 | 1825 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
7c6ef2a2 SH |
1826 | return -1; |
1827 | } | |
86530b0a | 1828 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1829 | |
1830 | /* bind mount '/dev/<ttydir>/console' to '/dev/console' */ | |
86530b0a L |
1831 | ret = safe_mount(lxcpath, path, "none", MS_BIND, 0, rootfs_path); |
1832 | if (ret < 0) { | |
0fd73091 | 1833 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1834 | return -1; |
1835 | } | |
86530b0a | 1836 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 | 1837 | |
86530b0a | 1838 | DEBUG("Console has been setup under \"%s\" and mounted to \"%s\"", lxcpath, path); |
6e590161 | 1839 | return 0; |
1840 | } | |
1841 | ||
3d7d929a | 1842 | static int lxc_setup_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1843 | const struct lxc_terminal *console, char *ttydir) |
7c6ef2a2 | 1844 | { |
3d7d929a | 1845 | |
7c6ef2a2 | 1846 | if (!ttydir) |
3d7d929a | 1847 | return lxc_setup_dev_console(rootfs, console); |
7c6ef2a2 | 1848 | |
3d7d929a | 1849 | return lxc_setup_ttydir_console(rootfs, console, ttydir); |
7c6ef2a2 SH |
1850 | } |
1851 | ||
efed99a4 | 1852 | static void parse_mntopt(char *opt, unsigned long *flags, char **data, size_t size) |
998ac676 RT |
1853 | { |
1854 | struct mount_opt *mo; | |
1855 | ||
85c2de39 MB |
1856 | /* If '=' is contained in opt, the option must go into data. */ |
1857 | if (!strchr(opt, '=')) { | |
1858 | ||
1859 | /* If opt is found in mount_opt, set or clear flags. | |
1860 | * Otherwise append it to data. */ | |
1861 | size_t opt_len = strlen(opt); | |
1862 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
1863 | size_t mo_name_len = strlen(mo->name); | |
1864 | if (opt_len == mo_name_len && strncmp(opt, mo->name, mo_name_len) == 0) { | |
1865 | if (mo->clear) | |
1866 | *flags &= ~mo->flag; | |
1867 | else | |
1868 | *flags |= mo->flag; | |
1869 | return; | |
1870 | } | |
998ac676 RT |
1871 | } |
1872 | } | |
1873 | ||
f1e05b90 DJ |
1874 | if (strlen(*data)) |
1875 | (void)strlcat(*data, ",", size); | |
efed99a4 | 1876 | |
f1e05b90 | 1877 | (void)strlcat(*data, opt, size); |
998ac676 RT |
1878 | } |
1879 | ||
0fd73091 | 1880 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, char **mntdata) |
998ac676 | 1881 | { |
a71f619c CB |
1882 | __do_free char *data = NULL, *s = NULL; |
1883 | char *p; | |
efed99a4 | 1884 | size_t size; |
998ac676 | 1885 | |
911324ef | 1886 | *mntdata = NULL; |
91656ce5 | 1887 | *mntflags = 0L; |
911324ef DL |
1888 | |
1889 | if (!mntopts) | |
998ac676 RT |
1890 | return 0; |
1891 | ||
911324ef | 1892 | s = strdup(mntopts); |
0fd73091 | 1893 | if (!s) |
998ac676 | 1894 | return -1; |
998ac676 | 1895 | |
efed99a4 DJ |
1896 | size = strlen(s) + 1; |
1897 | data = malloc(size); | |
a71f619c | 1898 | if (!data) |
998ac676 | 1899 | return -1; |
998ac676 RT |
1900 | *data = 0; |
1901 | ||
8db9d26f | 1902 | lxc_iterate_parts(p, s, ",") |
efed99a4 | 1903 | parse_mntopt(p, mntflags, &data, size); |
998ac676 RT |
1904 | |
1905 | if (*data) | |
a71f619c | 1906 | *mntdata = move_ptr(data); |
998ac676 RT |
1907 | |
1908 | return 0; | |
1909 | } | |
1910 | ||
d840039e YT |
1911 | static void parse_propagationopt(char *opt, unsigned long *flags) |
1912 | { | |
1913 | struct mount_opt *mo; | |
1914 | ||
1915 | /* If opt is found in propagation_opt, set or clear flags. */ | |
d840039e | 1916 | for (mo = &propagation_opt[0]; mo->name != NULL; mo++) { |
0fd73091 CB |
1917 | if (strncmp(opt, mo->name, strlen(mo->name)) != 0) |
1918 | continue; | |
1919 | ||
1920 | if (mo->clear) | |
1921 | *flags &= ~mo->flag; | |
1922 | else | |
1923 | *flags |= mo->flag; | |
1924 | ||
1925 | return; | |
d840039e YT |
1926 | } |
1927 | } | |
1928 | ||
8ce1abc2 | 1929 | int parse_propagationopts(const char *mntopts, unsigned long *pflags) |
d840039e | 1930 | { |
dfd2e059 CB |
1931 | __do_free char *s = NULL; |
1932 | char *p; | |
d840039e YT |
1933 | |
1934 | if (!mntopts) | |
1935 | return 0; | |
1936 | ||
1937 | s = strdup(mntopts); | |
1938 | if (!s) { | |
1939 | SYSERROR("Failed to allocate memory"); | |
1940 | return -ENOMEM; | |
1941 | } | |
1942 | ||
0fd73091 | 1943 | *pflags = 0L; |
8db9d26f | 1944 | lxc_iterate_parts(p, s, ",") |
d840039e | 1945 | parse_propagationopt(p, pflags); |
0fd73091 | 1946 | |
d840039e YT |
1947 | return 0; |
1948 | } | |
1949 | ||
6fd5e769 SH |
1950 | static void null_endofword(char *word) |
1951 | { | |
1952 | while (*word && *word != ' ' && *word != '\t') | |
1953 | word++; | |
1954 | *word = '\0'; | |
1955 | } | |
1956 | ||
0fd73091 | 1957 | /* skip @nfields spaces in @src */ |
6fd5e769 SH |
1958 | static char *get_field(char *src, int nfields) |
1959 | { | |
6fd5e769 | 1960 | int i; |
0fd73091 | 1961 | char *p = src; |
6fd5e769 SH |
1962 | |
1963 | for (i = 0; i < nfields; i++) { | |
1964 | while (*p && *p != ' ' && *p != '\t') | |
1965 | p++; | |
0fd73091 | 1966 | |
6fd5e769 SH |
1967 | if (!*p) |
1968 | break; | |
0fd73091 | 1969 | |
6fd5e769 SH |
1970 | p++; |
1971 | } | |
0fd73091 | 1972 | |
6fd5e769 SH |
1973 | return p; |
1974 | } | |
1975 | ||
911324ef DL |
1976 | static int mount_entry(const char *fsname, const char *target, |
1977 | const char *fstype, unsigned long mountflags, | |
d840039e YT |
1978 | unsigned long pflags, const char *data, bool optional, |
1979 | bool dev, bool relative, const char *rootfs) | |
911324ef | 1980 | { |
0ac4b28a | 1981 | int ret; |
6b5a54cd | 1982 | char srcbuf[PATH_MAX]; |
181437fd | 1983 | const char *srcpath = fsname; |
614305f3 | 1984 | #ifdef HAVE_STATVFS |
2938f7c8 | 1985 | struct statvfs sb; |
614305f3 | 1986 | #endif |
2938f7c8 | 1987 | |
181437fd | 1988 | if (relative) { |
6b5a54cd CB |
1989 | ret = snprintf(srcbuf, PATH_MAX, "%s/%s", rootfs ? rootfs : "/", fsname ? fsname : ""); |
1990 | if (ret < 0 || ret >= PATH_MAX) { | |
181437fd YT |
1991 | ERROR("source path is too long"); |
1992 | return -1; | |
1993 | } | |
1994 | srcpath = srcbuf; | |
1995 | } | |
1996 | ||
1997 | ret = safe_mount(srcpath, target, fstype, mountflags & ~MS_REMOUNT, data, | |
0ac4b28a CB |
1998 | rootfs); |
1999 | if (ret < 0) { | |
1fc64d22 | 2000 | if (optional) { |
7874d81a | 2001 | SYSINFO("Failed to mount \"%s\" on \"%s\" (optional)", |
2002 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
2003 | return 0; |
2004 | } | |
0ac4b28a | 2005 | |
0103eb53 | 2006 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2007 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2008 | return -1; |
911324ef DL |
2009 | } |
2010 | ||
2011 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
7c5b6e7c | 2012 | unsigned long rqd_flags = 0; |
0ac4b28a CB |
2013 | |
2014 | DEBUG("Remounting \"%s\" on \"%s\" to respect bind or remount " | |
181437fd | 2015 | "options", srcpath ? srcpath : "(none)", target ? target : "(none)"); |
0ac4b28a | 2016 | |
7c5b6e7c AS |
2017 | if (mountflags & MS_RDONLY) |
2018 | rqd_flags |= MS_RDONLY; | |
614305f3 | 2019 | #ifdef HAVE_STATVFS |
181437fd | 2020 | if (srcpath && statvfs(srcpath, &sb) == 0) { |
7c5b6e7c | 2021 | unsigned long required_flags = rqd_flags; |
0ac4b28a | 2022 | |
2938f7c8 SH |
2023 | if (sb.f_flag & MS_NOSUID) |
2024 | required_flags |= MS_NOSUID; | |
0ac4b28a | 2025 | |
ae7a770e | 2026 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 | 2027 | required_flags |= MS_NODEV; |
0ac4b28a | 2028 | |
2938f7c8 SH |
2029 | if (sb.f_flag & MS_RDONLY) |
2030 | required_flags |= MS_RDONLY; | |
0ac4b28a | 2031 | |
2938f7c8 SH |
2032 | if (sb.f_flag & MS_NOEXEC) |
2033 | required_flags |= MS_NOEXEC; | |
0ac4b28a CB |
2034 | |
2035 | DEBUG("Flags for \"%s\" were %lu, required extra flags " | |
181437fd | 2036 | "are %lu", srcpath, sb.f_flag, required_flags); |
0ac4b28a CB |
2037 | |
2038 | /* If this was a bind mount request, and required_flags | |
2938f7c8 | 2039 | * does not have any flags which are not already in |
0ac4b28a | 2040 | * mountflags, then skip the remount. |
2938f7c8 SH |
2041 | */ |
2042 | if (!(mountflags & MS_REMOUNT)) { | |
0ac4b28a CB |
2043 | if (!(required_flags & ~mountflags) && |
2044 | rqd_flags == 0) { | |
2045 | DEBUG("Mountflags already were %lu, " | |
2046 | "skipping remount", mountflags); | |
2938f7c8 SH |
2047 | goto skipremount; |
2048 | } | |
2049 | } | |
0ac4b28a | 2050 | |
2938f7c8 | 2051 | mountflags |= required_flags; |
6fd5e769 | 2052 | } |
614305f3 | 2053 | #endif |
911324ef | 2054 | |
181437fd | 2055 | ret = mount(srcpath, target, fstype, mountflags | MS_REMOUNT, data); |
0ac4b28a | 2056 | if (ret < 0) { |
1fc64d22 | 2057 | if (optional) { |
7874d81a | 2058 | SYSINFO("Failed to mount \"%s\" on \"%s\" (optional)", |
2059 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
2060 | return 0; |
2061 | } | |
0ac4b28a | 2062 | |
0103eb53 | 2063 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2064 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2065 | return -1; |
911324ef DL |
2066 | } |
2067 | } | |
2068 | ||
a3ed9b81 | 2069 | #ifdef HAVE_STATVFS |
2070 | skipremount: | |
2071 | #endif | |
d840039e YT |
2072 | if (pflags) { |
2073 | ret = mount(NULL, target, NULL, pflags, NULL); | |
2074 | if (ret < 0) { | |
2075 | if (optional) { | |
7874d81a | 2076 | SYSINFO("Failed to change mount propagation " |
2077 | "for \"%s\" (optional)", target); | |
d840039e YT |
2078 | return 0; |
2079 | } else { | |
2080 | SYSERROR("Failed to change mount propagation " | |
2081 | "for \"%s\" (optional)", target); | |
2082 | return -1; | |
2083 | } | |
2084 | } | |
2085 | DEBUG("Changed mount propagation for \"%s\"", target); | |
2086 | } | |
2087 | ||
0103eb53 | 2088 | DEBUG("Mounted \"%s\" on \"%s\" with filesystem type \"%s\"", |
181437fd | 2089 | srcpath ? srcpath : "(null)", target, fstype); |
911324ef DL |
2090 | |
2091 | return 0; | |
2092 | } | |
2093 | ||
c5e30de4 | 2094 | /* Remove "optional", "create=dir", and "create=file" from mntopt */ |
4e4ca161 SH |
2095 | static void cull_mntent_opt(struct mntent *mntent) |
2096 | { | |
2097 | int i; | |
0fd73091 CB |
2098 | char *list[] = { |
2099 | "create=dir", | |
2100 | "create=file", | |
2101 | "optional", | |
2102 | "relative", | |
2103 | NULL | |
2104 | }; | |
c5e30de4 CB |
2105 | |
2106 | for (i = 0; list[i]; i++) { | |
2107 | char *p, *p2; | |
2108 | ||
2109 | p = strstr(mntent->mnt_opts, list[i]); | |
2110 | if (!p) | |
4e4ca161 | 2111 | continue; |
c5e30de4 | 2112 | |
4e4ca161 SH |
2113 | p2 = strchr(p, ','); |
2114 | if (!p2) { | |
2115 | /* no more mntopts, so just chop it here */ | |
2116 | *p = '\0'; | |
2117 | continue; | |
2118 | } | |
c5e30de4 CB |
2119 | |
2120 | memmove(p, p2 + 1, strlen(p2 + 1) + 1); | |
4e4ca161 SH |
2121 | } |
2122 | } | |
2123 | ||
4d5b72a1 | 2124 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
749f98d9 CB |
2125 | const char *path, |
2126 | const struct lxc_rootfs *rootfs, | |
0fd73091 | 2127 | const char *lxc_name, const char *lxc_path) |
0ad19a3f | 2128 | { |
7a76eeaa | 2129 | __do_free char *p1 = NULL; |
3b7e332f | 2130 | int ret; |
7a76eeaa | 2131 | char *p2; |
911324ef | 2132 | |
12e6ab5d | 2133 | if (strncmp(mntent->mnt_type, "overlay", 7) == 0) { |
749f98d9 | 2134 | ret = ovl_mkdir(mntent, rootfs, lxc_name, lxc_path); |
12e6ab5d CB |
2135 | if (ret < 0) |
2136 | return -1; | |
2137 | } | |
6e46cc0d | 2138 | |
34cfffb3 | 2139 | if (hasmntopt(mntent, "create=dir")) { |
749f98d9 CB |
2140 | ret = mkdir_p(path, 0755); |
2141 | if (ret < 0 && errno != EEXIST) { | |
2142 | SYSERROR("Failed to create directory \"%s\"", path); | |
2143 | return -1; | |
34cfffb3 SG |
2144 | } |
2145 | } | |
2146 | ||
0fd73091 CB |
2147 | if (!hasmntopt(mntent, "create=file")) |
2148 | return 0; | |
749f98d9 | 2149 | |
0fd73091 CB |
2150 | ret = access(path, F_OK); |
2151 | if (ret == 0) | |
2152 | return 0; | |
749f98d9 | 2153 | |
0fd73091 CB |
2154 | p1 = strdup(path); |
2155 | if (!p1) | |
2156 | return -1; | |
749f98d9 | 2157 | |
0fd73091 | 2158 | p2 = dirname(p1); |
749f98d9 | 2159 | |
0fd73091 | 2160 | ret = mkdir_p(p2, 0755); |
0fd73091 CB |
2161 | if (ret < 0 && errno != EEXIST) { |
2162 | SYSERROR("Failed to create directory \"%s\"", path); | |
2163 | return -1; | |
34cfffb3 | 2164 | } |
749f98d9 | 2165 | |
3b7e332f CB |
2166 | ret = mknod(path, S_IFREG | 0000, 0); |
2167 | if (ret < 0 && errno != EEXIST) | |
2168 | return -errno; | |
0fd73091 | 2169 | |
749f98d9 | 2170 | return 0; |
4d5b72a1 NC |
2171 | } |
2172 | ||
ec50007f CB |
2173 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
2174 | * without a rootfs. */ | |
db4aba38 | 2175 | static inline int mount_entry_on_generic(struct mntent *mntent, |
d8b712bc CB |
2176 | const char *path, |
2177 | const struct lxc_rootfs *rootfs, | |
2178 | const char *lxc_name, | |
2179 | const char *lxc_path) | |
4d5b72a1 | 2180 | { |
fd214f37 | 2181 | __do_free char *mntdata = NULL; |
d8b712bc | 2182 | int ret; |
949d0338 | 2183 | unsigned long mntflags; |
181437fd | 2184 | bool dev, optional, relative; |
949d0338 | 2185 | unsigned long pflags = 0; |
ec50007f | 2186 | char *rootfs_path = NULL; |
d8b712bc CB |
2187 | |
2188 | optional = hasmntopt(mntent, "optional") != NULL; | |
2189 | dev = hasmntopt(mntent, "dev") != NULL; | |
181437fd | 2190 | relative = hasmntopt(mntent, "relative") != NULL; |
d8b712bc | 2191 | |
ec50007f CB |
2192 | if (rootfs && rootfs->path) |
2193 | rootfs_path = rootfs->mount; | |
2194 | ||
d8b712bc CB |
2195 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, |
2196 | lxc_path); | |
2197 | if (ret < 0) { | |
2198 | if (optional) | |
2199 | return 0; | |
608e3567 | 2200 | |
d8b712bc CB |
2201 | return -1; |
2202 | } | |
4e4ca161 SH |
2203 | cull_mntent_opt(mntent); |
2204 | ||
d840039e YT |
2205 | ret = parse_propagationopts(mntent->mnt_opts, &pflags); |
2206 | if (ret < 0) | |
2207 | return -1; | |
2208 | ||
d8b712bc CB |
2209 | ret = parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata); |
2210 | if (ret < 0) | |
a17b1e65 | 2211 | return -1; |
a17b1e65 | 2212 | |
6e46cc0d | 2213 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
d840039e | 2214 | pflags, mntdata, optional, dev, relative, rootfs_path); |
68c152ef | 2215 | |
911324ef DL |
2216 | return ret; |
2217 | } | |
2218 | ||
db4aba38 NC |
2219 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
2220 | { | |
1433c9f9 | 2221 | int ret; |
6b5a54cd | 2222 | char path[PATH_MAX]; |
1433c9f9 CB |
2223 | |
2224 | /* For containers created without a rootfs all mounts are treated as | |
07667a6a CB |
2225 | * absolute paths starting at / on the host. |
2226 | */ | |
1433c9f9 CB |
2227 | if (mntent->mnt_dir[0] != '/') |
2228 | ret = snprintf(path, sizeof(path), "/%s", mntent->mnt_dir); | |
2229 | else | |
2230 | ret = snprintf(path, sizeof(path), "%s", mntent->mnt_dir); | |
07667a6a | 2231 | if (ret < 0 || ret >= sizeof(path)) |
1433c9f9 | 2232 | return -1; |
1433c9f9 CB |
2233 | |
2234 | return mount_entry_on_generic(mntent, path, NULL, NULL, NULL); | |
db4aba38 NC |
2235 | } |
2236 | ||
4e4ca161 | 2237 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 | 2238 | const struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2239 | const char *lxc_name, |
2240 | const char *lxc_path) | |
911324ef | 2241 | { |
bdd2b34c | 2242 | int offset; |
013bd428 | 2243 | char *aux; |
67e571de | 2244 | const char *lxcpath; |
6b5a54cd | 2245 | char path[PATH_MAX]; |
bdd2b34c | 2246 | int ret = 0; |
0ad19a3f | 2247 | |
593e8478 | 2248 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
bdd2b34c | 2249 | if (!lxcpath) |
2a59a681 | 2250 | return -1; |
2a59a681 | 2251 | |
bdd2b34c CB |
2252 | /* If rootfs->path is a blockdev path, allow container fstab to use |
2253 | * <lxcpath>/<name>/rootfs" as the target prefix. | |
2254 | */ | |
6b5a54cd CB |
2255 | ret = snprintf(path, PATH_MAX, "%s/%s/rootfs", lxcpath, lxc_name); |
2256 | if (ret < 0 || ret >= PATH_MAX) | |
80a881b2 SH |
2257 | goto skipvarlib; |
2258 | ||
2259 | aux = strstr(mntent->mnt_dir, path); | |
2260 | if (aux) { | |
2261 | offset = strlen(path); | |
2262 | goto skipabs; | |
2263 | } | |
2264 | ||
2265 | skipvarlib: | |
013bd428 DL |
2266 | aux = strstr(mntent->mnt_dir, rootfs->path); |
2267 | if (!aux) { | |
bdd2b34c | 2268 | WARN("Ignoring mount point \"%s\"", mntent->mnt_dir); |
db4aba38 | 2269 | return ret; |
013bd428 | 2270 | } |
80a881b2 SH |
2271 | offset = strlen(rootfs->path); |
2272 | ||
2273 | skipabs: | |
6b5a54cd CB |
2274 | ret = snprintf(path, PATH_MAX, "%s/%s", rootfs->mount, aux + offset); |
2275 | if (ret < 0 || ret >= PATH_MAX) | |
a17b1e65 | 2276 | return -1; |
a17b1e65 | 2277 | |
0a2dddd4 | 2278 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef | 2279 | } |
d330fe7b | 2280 | |
4e4ca161 | 2281 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
0a2dddd4 CB |
2282 | const struct lxc_rootfs *rootfs, |
2283 | const char *lxc_name, | |
2284 | const char *lxc_path) | |
911324ef | 2285 | { |
911324ef | 2286 | int ret; |
6b5a54cd | 2287 | char path[PATH_MAX]; |
d330fe7b | 2288 | |
34cfffb3 | 2289 | /* relative to root mount point */ |
6e46cc0d | 2290 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs->mount, mntent->mnt_dir); |
0fd73091 | 2291 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
9ba8130c | 2292 | return -1; |
911324ef | 2293 | |
0a2dddd4 | 2294 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef DL |
2295 | } |
2296 | ||
06749971 CB |
2297 | static int mount_file_entries(const struct lxc_conf *conf, |
2298 | const struct lxc_rootfs *rootfs, FILE *file, | |
1ae3c19f | 2299 | const char *lxc_name, const char *lxc_path) |
911324ef | 2300 | { |
9d03d857 | 2301 | char buf[PATH_MAX]; |
0fd73091 | 2302 | struct mntent mntent; |
e76b8764 | 2303 | |
aaf901be | 2304 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
9d03d857 CB |
2305 | int ret; |
2306 | ||
1ae3c19f CB |
2307 | if (!rootfs->path) |
2308 | ret = mount_entry_on_systemfs(&mntent); | |
2309 | else if (mntent.mnt_dir[0] != '/') | |
2310 | ret = mount_entry_on_relative_rootfs(&mntent, rootfs, | |
2311 | lxc_name, lxc_path); | |
2312 | else | |
2313 | ret = mount_entry_on_absolute_rootfs(&mntent, rootfs, | |
9d03d857 | 2314 | lxc_name, lxc_path); |
1ae3c19f CB |
2315 | if (ret < 0) |
2316 | return -1; | |
0ad19a3f | 2317 | } |
cd54d859 | 2318 | |
9d03d857 CB |
2319 | if (!feof(file) || ferror(file)) { |
2320 | ERROR("Failed to parse mount entries"); | |
2321 | return -1; | |
2322 | } | |
2323 | ||
2324 | return 0; | |
e7938e9e MN |
2325 | } |
2326 | ||
06749971 CB |
2327 | static int setup_mount(const struct lxc_conf *conf, |
2328 | const struct lxc_rootfs *rootfs, const char *fstab, | |
42dff448 | 2329 | const char *lxc_name, const char *lxc_path) |
e7938e9e | 2330 | { |
42dff448 | 2331 | FILE *f; |
e7938e9e MN |
2332 | int ret; |
2333 | ||
2334 | if (!fstab) | |
2335 | return 0; | |
2336 | ||
42dff448 CB |
2337 | f = setmntent(fstab, "r"); |
2338 | if (!f) { | |
2339 | SYSERROR("Failed to open \"%s\"", fstab); | |
e7938e9e MN |
2340 | return -1; |
2341 | } | |
2342 | ||
06749971 | 2343 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
42dff448 CB |
2344 | if (ret < 0) |
2345 | ERROR("Failed to set up mount entries"); | |
e7938e9e | 2346 | |
42dff448 | 2347 | endmntent(f); |
0ad19a3f | 2348 | return ret; |
2349 | } | |
2350 | ||
1800f924 WB |
2351 | /* |
2352 | * In order for nested containers to be able to mount /proc and /sys they need | |
2353 | * to see a "pure" proc and sysfs mount points with nothing mounted on top | |
2354 | * (like lxcfs). | |
2355 | * For this we provide proc and sysfs in /dev/.lxc/{proc,sys} while using an | |
2356 | * apparmor rule to deny access to them. This is mostly for convenience: The | |
2357 | * container's root user can mount them anyway and thus has access to the two | |
2358 | * file systems. But a non-root user in the container should not be allowed to | |
2359 | * access them as a side effect without explicitly allowing it. | |
2360 | */ | |
2361 | static const char nesting_helpers[] = | |
dc691e34 CB |
2362 | "proc dev/.lxc/proc proc create=dir,optional 0 0\n" |
2363 | "sys dev/.lxc/sys sysfs create=dir,optional 0 0\n"; | |
1800f924 WB |
2364 | |
2365 | FILE *make_anonymous_mount_file(struct lxc_list *mount, | |
2366 | bool include_nesting_helpers) | |
e7938e9e | 2367 | { |
79bcf5ee | 2368 | __do_close_prot_errno int fd = -EBADF; |
4110345b | 2369 | FILE *f; |
5ef5c9a3 | 2370 | int ret; |
e7938e9e | 2371 | char *mount_entry; |
5ef5c9a3 | 2372 | struct lxc_list *iterator; |
5ef5c9a3 | 2373 | |
0fd73091 | 2374 | fd = memfd_create(".lxc_mount_file", MFD_CLOEXEC); |
5ef5c9a3 | 2375 | if (fd < 0) { |
a324e7eb CB |
2376 | char template[] = P_tmpdir "/.lxc_mount_file_XXXXXX"; |
2377 | ||
5ef5c9a3 CB |
2378 | if (errno != ENOSYS) |
2379 | return NULL; | |
a324e7eb CB |
2380 | |
2381 | fd = lxc_make_tmpfile(template, true); | |
0fd73091 CB |
2382 | if (fd < 0) { |
2383 | SYSERROR("Could not create temporary mount file"); | |
2384 | return NULL; | |
2385 | } | |
2386 | ||
6bd04140 | 2387 | TRACE("Created temporary mount file"); |
5ef5c9a3 | 2388 | } |
e7938e9e | 2389 | |
0fd73091 CB |
2390 | lxc_list_for_each (iterator, mount) { |
2391 | size_t len; | |
2392 | ||
e7938e9e | 2393 | mount_entry = iterator->elem; |
0fd73091 | 2394 | len = strlen(mount_entry); |
5ef5c9a3 | 2395 | |
489f39be | 2396 | ret = lxc_write_nointr(fd, mount_entry, len); |
0fd73091 | 2397 | if (ret != len) |
79bcf5ee | 2398 | return NULL; |
0fd73091 | 2399 | |
489f39be | 2400 | ret = lxc_write_nointr(fd, "\n", 1); |
0fd73091 | 2401 | if (ret != 1) |
79bcf5ee | 2402 | return NULL; |
e7938e9e MN |
2403 | } |
2404 | ||
1800f924 WB |
2405 | if (include_nesting_helpers) { |
2406 | ret = lxc_write_nointr(fd, nesting_helpers, | |
6333c915 CB |
2407 | STRARRAYLEN(nesting_helpers)); |
2408 | if (ret != STRARRAYLEN(nesting_helpers)) | |
79bcf5ee | 2409 | return NULL; |
1800f924 WB |
2410 | } |
2411 | ||
0fd73091 CB |
2412 | ret = lseek(fd, 0, SEEK_SET); |
2413 | if (ret < 0) | |
79bcf5ee | 2414 | return NULL; |
0fd73091 | 2415 | |
4110345b CB |
2416 | f = fdopen(fd, "re+"); |
2417 | if (f) | |
2418 | move_fd(fd); /* Transfer ownership of fd. */ | |
2419 | return f; | |
9fc7f8c0 TA |
2420 | } |
2421 | ||
06749971 CB |
2422 | static int setup_mount_entries(const struct lxc_conf *conf, |
2423 | const struct lxc_rootfs *rootfs, | |
5ef5c9a3 CB |
2424 | struct lxc_list *mount, const char *lxc_name, |
2425 | const char *lxc_path) | |
9fc7f8c0 | 2426 | { |
c85ced65 | 2427 | __do_fclose FILE *f = NULL; |
9fc7f8c0 | 2428 | |
1800f924 | 2429 | f = make_anonymous_mount_file(mount, conf->lsm_aa_allow_nesting); |
19b5d755 | 2430 | if (!f) |
9fc7f8c0 | 2431 | return -1; |
e7938e9e | 2432 | |
c85ced65 | 2433 | return mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
e7938e9e MN |
2434 | } |
2435 | ||
bab88e68 CS |
2436 | static int parse_cap(const char *cap) |
2437 | { | |
84760c11 | 2438 | size_t i; |
2439 | int capid = -1; | |
0fd73091 CB |
2440 | size_t end = sizeof(caps_opt) / sizeof(caps_opt[0]); |
2441 | char *ptr = NULL; | |
bab88e68 | 2442 | |
0fd73091 | 2443 | if (strcmp(cap, "none") == 0) |
7035407c DE |
2444 | return -2; |
2445 | ||
8560cd36 | 2446 | for (i = 0; i < end; i++) { |
bab88e68 CS |
2447 | if (strcmp(cap, caps_opt[i].name)) |
2448 | continue; | |
2449 | ||
2450 | capid = caps_opt[i].value; | |
2451 | break; | |
2452 | } | |
2453 | ||
2454 | if (capid < 0) { | |
0fd73091 CB |
2455 | /* Try to see if it's numeric, so the user may specify |
2456 | * capabilities that the running kernel knows about but we | |
2457 | * don't | |
2458 | */ | |
bab88e68 CS |
2459 | errno = 0; |
2460 | capid = strtol(cap, &ptr, 10); | |
2461 | if (!ptr || *ptr != '\0' || errno != 0) | |
2462 | /* not a valid number */ | |
2463 | capid = -1; | |
2464 | else if (capid > lxc_caps_last_cap()) | |
2465 | /* we have a number but it's not a valid | |
2466 | * capability */ | |
2467 | capid = -1; | |
2468 | } | |
2469 | ||
2470 | return capid; | |
2471 | } | |
2472 | ||
0769b82a CS |
2473 | int in_caplist(int cap, struct lxc_list *caps) |
2474 | { | |
0769b82a | 2475 | int capid; |
0fd73091 | 2476 | struct lxc_list *iterator; |
0769b82a | 2477 | |
0fd73091 | 2478 | lxc_list_for_each (iterator, caps) { |
0769b82a CS |
2479 | capid = parse_cap(iterator->elem); |
2480 | if (capid == cap) | |
2481 | return 1; | |
2482 | } | |
2483 | ||
2484 | return 0; | |
2485 | } | |
2486 | ||
81810dd1 DL |
2487 | static int setup_caps(struct lxc_list *caps) |
2488 | { | |
bab88e68 | 2489 | int capid; |
0fd73091 CB |
2490 | char *drop_entry; |
2491 | struct lxc_list *iterator; | |
81810dd1 | 2492 | |
0fd73091 CB |
2493 | lxc_list_for_each (iterator, caps) { |
2494 | int ret; | |
81810dd1 DL |
2495 | |
2496 | drop_entry = iterator->elem; | |
2497 | ||
bab88e68 | 2498 | capid = parse_cap(drop_entry); |
0fd73091 | 2499 | if (capid < 0) { |
1e11be34 DL |
2500 | ERROR("unknown capability %s", drop_entry); |
2501 | return -1; | |
81810dd1 DL |
2502 | } |
2503 | ||
b81689a1 CB |
2504 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(capid), prctl_arg(0), |
2505 | prctl_arg(0), prctl_arg(0)); | |
0fd73091 CB |
2506 | if (ret < 0) { |
2507 | SYSERROR("Failed to remove %s capability", drop_entry); | |
3ec1648d SH |
2508 | return -1; |
2509 | } | |
0fd73091 | 2510 | DEBUG("Dropped %s (%d) capability", drop_entry, capid); |
81810dd1 DL |
2511 | } |
2512 | ||
0fd73091 | 2513 | DEBUG("Capabilities have been setup"); |
1fb86a7c SH |
2514 | return 0; |
2515 | } | |
2516 | ||
2517 | static int dropcaps_except(struct lxc_list *caps) | |
2518 | { | |
2f443e88 | 2519 | __do_free int *caplist = NULL; |
0fd73091 | 2520 | int i, capid, numcaps; |
1fb86a7c | 2521 | char *keep_entry; |
0fd73091 | 2522 | struct lxc_list *iterator; |
1fb86a7c | 2523 | |
0fd73091 | 2524 | numcaps = lxc_caps_last_cap() + 1; |
2caf9a97 SH |
2525 | if (numcaps <= 0 || numcaps > 200) |
2526 | return -1; | |
0fd73091 | 2527 | TRACE("Found %d capabilities", numcaps); |
2caf9a97 | 2528 | |
1a0e70ac | 2529 | /* caplist[i] is 1 if we keep capability i */ |
2f443e88 | 2530 | caplist = must_realloc(NULL, numcaps * sizeof(int)); |
1fb86a7c SH |
2531 | memset(caplist, 0, numcaps * sizeof(int)); |
2532 | ||
0fd73091 | 2533 | lxc_list_for_each (iterator, caps) { |
1fb86a7c SH |
2534 | keep_entry = iterator->elem; |
2535 | ||
bab88e68 | 2536 | capid = parse_cap(keep_entry); |
7035407c DE |
2537 | if (capid == -2) |
2538 | continue; | |
2539 | ||
0fd73091 CB |
2540 | if (capid < 0) { |
2541 | ERROR("Unknown capability %s", keep_entry); | |
1fb86a7c SH |
2542 | return -1; |
2543 | } | |
2544 | ||
0fd73091 | 2545 | DEBUG("Keep capability %s (%d)", keep_entry, capid); |
1fb86a7c SH |
2546 | caplist[capid] = 1; |
2547 | } | |
0fd73091 CB |
2548 | |
2549 | for (i = 0; i < numcaps; i++) { | |
2550 | int ret; | |
2551 | ||
1fb86a7c SH |
2552 | if (caplist[i]) |
2553 | continue; | |
0fd73091 | 2554 | |
b81689a1 CB |
2555 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(i), prctl_arg(0), |
2556 | prctl_arg(0), prctl_arg(0)); | |
0fd73091 CB |
2557 | if (ret < 0) { |
2558 | SYSERROR("Failed to remove capability %d", i); | |
3ec1648d SH |
2559 | return -1; |
2560 | } | |
1fb86a7c SH |
2561 | } |
2562 | ||
0fd73091 | 2563 | DEBUG("Capabilities have been setup"); |
81810dd1 DL |
2564 | return 0; |
2565 | } | |
2566 | ||
0fd73091 CB |
2567 | static int parse_resource(const char *res) |
2568 | { | |
2569 | int ret; | |
c6d09e15 WB |
2570 | size_t i; |
2571 | int resid = -1; | |
2572 | ||
0fd73091 | 2573 | for (i = 0; i < sizeof(limit_opt) / sizeof(limit_opt[0]); ++i) |
c6d09e15 WB |
2574 | if (strcmp(res, limit_opt[i].name) == 0) |
2575 | return limit_opt[i].value; | |
c6d09e15 | 2576 | |
0fd73091 | 2577 | /* Try to see if it's numeric, so the user may specify |
c6d09e15 | 2578 | * resources that the running kernel knows about but |
0fd73091 CB |
2579 | * we don't. |
2580 | */ | |
2581 | ret = lxc_safe_int(res, &resid); | |
2582 | if (ret < 0) | |
2583 | return -1; | |
2584 | ||
2585 | return resid; | |
c6d09e15 WB |
2586 | } |
2587 | ||
0fd73091 CB |
2588 | int setup_resource_limits(struct lxc_list *limits, pid_t pid) |
2589 | { | |
2590 | int resid; | |
c6d09e15 WB |
2591 | struct lxc_list *it; |
2592 | struct lxc_limit *lim; | |
c6d09e15 | 2593 | |
0fd73091 | 2594 | lxc_list_for_each (it, limits) { |
c6d09e15 WB |
2595 | lim = it->elem; |
2596 | ||
2597 | resid = parse_resource(lim->resource); | |
2598 | if (resid < 0) { | |
0fd73091 | 2599 | ERROR("Unknown resource %s", lim->resource); |
c6d09e15 WB |
2600 | return -1; |
2601 | } | |
2602 | ||
f48b5fd8 | 2603 | #if HAVE_PRLIMIT || HAVE_PRLIMIT64 |
c6d09e15 | 2604 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) { |
6d1400b5 | 2605 | SYSERROR("Failed to set limit %s", lim->resource); |
c6d09e15 WB |
2606 | return -1; |
2607 | } | |
2de12765 CB |
2608 | |
2609 | TRACE("Setup \"%s\" limit", lim->resource); | |
f48b5fd8 | 2610 | #else |
2de12765 | 2611 | ERROR("Cannot set limit \"%s\" as prlimit is missing", lim->resource); |
f48b5fd8 FF |
2612 | return -1; |
2613 | #endif | |
c6d09e15 | 2614 | } |
0fd73091 | 2615 | |
c6d09e15 WB |
2616 | return 0; |
2617 | } | |
2618 | ||
7edd0540 L |
2619 | int setup_sysctl_parameters(struct lxc_list *sysctls) |
2620 | { | |
e6f76452 | 2621 | __do_free char *tmp = NULL; |
7edd0540 L |
2622 | struct lxc_list *it; |
2623 | struct lxc_sysctl *elem; | |
0fd73091 | 2624 | int ret = 0; |
6b5a54cd | 2625 | char filename[PATH_MAX] = {0}; |
7edd0540 | 2626 | |
0fd73091 | 2627 | lxc_list_for_each (it, sysctls) { |
7edd0540 L |
2628 | elem = it->elem; |
2629 | tmp = lxc_string_replace(".", "/", elem->key); | |
2630 | if (!tmp) { | |
2631 | ERROR("Failed to replace key %s", elem->key); | |
2632 | return -1; | |
2633 | } | |
2634 | ||
2635 | ret = snprintf(filename, sizeof(filename), "/proc/sys/%s", tmp); | |
7edd0540 L |
2636 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { |
2637 | ERROR("Error setting up sysctl parameters path"); | |
2638 | return -1; | |
2639 | } | |
2640 | ||
0fd73091 | 2641 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2642 | strlen(elem->value), false, 0666); |
7edd0540 | 2643 | if (ret < 0) { |
688e8982 WB |
2644 | SYSERROR("Failed to setup sysctl parameters %s to %s", |
2645 | elem->key, elem->value); | |
7edd0540 L |
2646 | return -1; |
2647 | } | |
2648 | } | |
0fd73091 | 2649 | |
7edd0540 L |
2650 | return 0; |
2651 | } | |
2652 | ||
61d7a733 YT |
2653 | int setup_proc_filesystem(struct lxc_list *procs, pid_t pid) |
2654 | { | |
0c669152 | 2655 | __do_free char *tmp = NULL; |
61d7a733 YT |
2656 | struct lxc_list *it; |
2657 | struct lxc_proc *elem; | |
0fd73091 | 2658 | int ret = 0; |
6b5a54cd | 2659 | char filename[PATH_MAX] = {0}; |
61d7a733 | 2660 | |
0fd73091 | 2661 | lxc_list_for_each (it, procs) { |
61d7a733 YT |
2662 | elem = it->elem; |
2663 | tmp = lxc_string_replace(".", "/", elem->filename); | |
2664 | if (!tmp) { | |
2665 | ERROR("Failed to replace key %s", elem->filename); | |
2666 | return -1; | |
2667 | } | |
2668 | ||
2669 | ret = snprintf(filename, sizeof(filename), "/proc/%d/%s", pid, tmp); | |
61d7a733 YT |
2670 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { |
2671 | ERROR("Error setting up proc filesystem path"); | |
2672 | return -1; | |
2673 | } | |
2674 | ||
0fd73091 | 2675 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2676 | strlen(elem->value), false, 0666); |
61d7a733 | 2677 | if (ret < 0) { |
688e8982 WB |
2678 | SYSERROR("Failed to setup proc filesystem %s to %s", |
2679 | elem->filename, elem->value); | |
61d7a733 YT |
2680 | return -1; |
2681 | } | |
2682 | } | |
0fd73091 | 2683 | |
61d7a733 YT |
2684 | return 0; |
2685 | } | |
2686 | ||
ae9242c8 SH |
2687 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2688 | ||
7b379ab3 | 2689 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2690 | { |
26ddeedd | 2691 | int i; |
0fd73091 | 2692 | struct lxc_conf *new; |
7b379ab3 | 2693 | |
13277ec4 | 2694 | new = malloc(sizeof(*new)); |
0fd73091 | 2695 | if (!new) |
7b379ab3 | 2696 | return NULL; |
7b379ab3 MN |
2697 | memset(new, 0, sizeof(*new)); |
2698 | ||
4b73005c | 2699 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
cccc74b5 | 2700 | new->personality = -1; |
124fa0a8 | 2701 | new->autodev = 1; |
3a784510 | 2702 | new->console.buffer_size = 0; |
596a818d DE |
2703 | new->console.log_path = NULL; |
2704 | new->console.log_fd = -1; | |
861813e5 | 2705 | new->console.log_size = 0; |
28a4b0e5 | 2706 | new->console.path = NULL; |
63376d7d | 2707 | new->console.peer = -1; |
fb87aa6a CB |
2708 | new->console.proxy.busy = -1; |
2709 | new->console.proxy.master = -1; | |
2710 | new->console.proxy.slave = -1; | |
63376d7d DL |
2711 | new->console.master = -1; |
2712 | new->console.slave = -1; | |
2713 | new->console.name[0] = '\0'; | |
732375f5 | 2714 | memset(&new->console.ringbuf, 0, sizeof(struct lxc_ringbuf)); |
d2e30e99 | 2715 | new->maincmd_fd = -1; |
258f8051 | 2716 | new->monitor_signal_pdeath = SIGKILL; |
76a26f55 | 2717 | new->nbd_idx = -1; |
54c30e29 | 2718 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 2719 | if (!new->rootfs.mount) { |
53f3f048 SH |
2720 | free(new); |
2721 | return NULL; | |
2722 | } | |
6e54330c | 2723 | new->rootfs.managed = true; |
858377e4 | 2724 | new->logfd = -1; |
7b379ab3 | 2725 | lxc_list_init(&new->cgroup); |
54860ed0 | 2726 | lxc_list_init(&new->cgroup2); |
4bfb655e | 2727 | lxc_list_init(&new->devices); |
7b379ab3 MN |
2728 | lxc_list_init(&new->network); |
2729 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2730 | lxc_list_init(&new->caps); |
1fb86a7c | 2731 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2732 | lxc_list_init(&new->id_map); |
46ad64ab CB |
2733 | new->root_nsuid_map = NULL; |
2734 | new->root_nsgid_map = NULL; | |
f979ac15 | 2735 | lxc_list_init(&new->includes); |
4184c3e1 | 2736 | lxc_list_init(&new->aliens); |
7c661726 | 2737 | lxc_list_init(&new->environment); |
c6d09e15 | 2738 | lxc_list_init(&new->limits); |
7edd0540 | 2739 | lxc_list_init(&new->sysctls); |
61d7a733 | 2740 | lxc_list_init(&new->procs); |
44ae0fb6 | 2741 | new->hooks_version = 0; |
28d9e29e | 2742 | for (i = 0; i < NUM_LXC_HOOKS; i++) |
26ddeedd | 2743 | lxc_list_init(&new->hooks[i]); |
ee1e7aa0 | 2744 | lxc_list_init(&new->groups); |
d39b10eb | 2745 | lxc_list_init(&new->state_clients); |
fe4de9a6 | 2746 | new->lsm_aa_profile = NULL; |
1800f924 | 2747 | lxc_list_init(&new->lsm_aa_raw); |
fe4de9a6 | 2748 | new->lsm_se_context = NULL; |
4fef78bc | 2749 | new->lsm_se_keyring_context = NULL; |
8f818a84 | 2750 | new->keyring_disable_session = false; |
7a0bcca3 | 2751 | new->tmp_umount_proc = false; |
7a41e857 LT |
2752 | new->tmp_umount_proc = 0; |
2753 | new->shmount.path_host = NULL; | |
2754 | new->shmount.path_cont = NULL; | |
7b379ab3 | 2755 | |
72bb04e4 PT |
2756 | /* if running in a new user namespace, init and COMMAND |
2757 | * default to running as UID/GID 0 when using lxc-execute */ | |
2758 | new->init_uid = 0; | |
2759 | new->init_gid = 0; | |
43654d34 | 2760 | memset(&new->cgroup_meta, 0, sizeof(struct lxc_cgroup)); |
b074bbf1 | 2761 | memset(&new->ns_share, 0, sizeof(char *) * LXC_NS_MAX); |
c3e3c21a | 2762 | seccomp_conf_init(new); |
72bb04e4 | 2763 | |
7b379ab3 | 2764 | return new; |
089cd8b8 DL |
2765 | } |
2766 | ||
344c9d81 | 2767 | int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
a19b974f | 2768 | size_t buf_size) |
f6d3e3e4 | 2769 | { |
41e00749 | 2770 | __do_close_prot_errno int fd = -EBADF; |
76bcd422 | 2771 | int ret; |
6b5a54cd | 2772 | char path[PATH_MAX]; |
f6d3e3e4 | 2773 | |
a19b974f | 2774 | if (geteuid() != 0 && idtype == ID_TYPE_GID) { |
76bcd422 | 2775 | __do_close_prot_errno int setgroups_fd = -EBADF; |
a19b974f | 2776 | |
6b5a54cd CB |
2777 | ret = snprintf(path, PATH_MAX, "/proc/%d/setgroups", pid); |
2778 | if (ret < 0 || ret >= PATH_MAX) | |
a19b974f | 2779 | return -E2BIG; |
a19b974f | 2780 | |
76bcd422 CB |
2781 | setgroups_fd = open(path, O_WRONLY); |
2782 | if (setgroups_fd < 0 && errno != ENOENT) { | |
a19b974f CB |
2783 | SYSERROR("Failed to open \"%s\"", path); |
2784 | return -1; | |
2785 | } | |
2786 | ||
76bcd422 CB |
2787 | if (setgroups_fd >= 0) { |
2788 | ret = lxc_write_nointr(setgroups_fd, "deny\n", | |
2789 | STRLITERALLEN("deny\n")); | |
2790 | if (ret != STRLITERALLEN("deny\n")) { | |
2791 | SYSERROR("Failed to write \"deny\" to \"/proc/%d/setgroups\"", pid); | |
2388737b CB |
2792 | return -1; |
2793 | } | |
395b1a3e | 2794 | TRACE("Wrote \"deny\" to \"/proc/%d/setgroups\"", pid); |
a19b974f | 2795 | } |
a19b974f CB |
2796 | } |
2797 | ||
6b5a54cd | 2798 | ret = snprintf(path, PATH_MAX, "/proc/%d/%cid_map", pid, |
29053180 | 2799 | idtype == ID_TYPE_UID ? 'u' : 'g'); |
6b5a54cd | 2800 | if (ret < 0 || ret >= PATH_MAX) |
f6d3e3e4 | 2801 | return -E2BIG; |
29053180 CB |
2802 | |
2803 | fd = open(path, O_WRONLY); | |
2804 | if (fd < 0) { | |
a19b974f | 2805 | SYSERROR("Failed to open \"%s\"", path); |
29053180 | 2806 | return -1; |
f6d3e3e4 | 2807 | } |
29053180 | 2808 | |
29053180 CB |
2809 | ret = lxc_write_nointr(fd, buf, buf_size); |
2810 | if (ret != buf_size) { | |
a19b974f | 2811 | SYSERROR("Failed to write %cid mapping to \"%s\"", |
29053180 | 2812 | idtype == ID_TYPE_UID ? 'u' : 'g', path); |
29053180 CB |
2813 | return -1; |
2814 | } | |
29053180 CB |
2815 | |
2816 | return 0; | |
f6d3e3e4 SH |
2817 | } |
2818 | ||
6e50e704 CB |
2819 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
2820 | * | |
2821 | * @return 1 if functional binary was found | |
2822 | * @return 0 if binary exists but is lacking privilege | |
2823 | * @return -ENOENT if binary does not exist | |
2824 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
6e50e704 | 2825 | */ |
df6a2945 CB |
2826 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
2827 | { | |
48411df2 | 2828 | __do_free char *path = NULL; |
df6a2945 CB |
2829 | int ret; |
2830 | struct stat st; | |
df6a2945 | 2831 | |
3275932b | 2832 | errno = EINVAL; |
6e50e704 | 2833 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
3275932b | 2834 | return -1; |
6e50e704 | 2835 | |
3275932b | 2836 | errno = ENOENT; |
df6a2945 CB |
2837 | path = on_path(binary, NULL); |
2838 | if (!path) | |
3275932b | 2839 | return -1; |
df6a2945 CB |
2840 | |
2841 | ret = stat(path, &st); | |
3275932b CB |
2842 | if (ret < 0) |
2843 | return -1; | |
df6a2945 CB |
2844 | |
2845 | /* Check if the binary is setuid. */ | |
2846 | if (st.st_mode & S_ISUID) { | |
0fd73091 | 2847 | DEBUG("The binary \"%s\" does have the setuid bit set", path); |
3275932b | 2848 | return 1; |
df6a2945 CB |
2849 | } |
2850 | ||
0fd73091 | 2851 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
2852 | /* Check if it has the CAP_SETUID capability. */ |
2853 | if ((cap & CAP_SETUID) && | |
2854 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
2855 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) { | |
2856 | DEBUG("The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE " | |
0fd73091 | 2857 | "and CAP_PERMITTED sets", path); |
3275932b | 2858 | return 1; |
df6a2945 CB |
2859 | } |
2860 | ||
2861 | /* Check if it has the CAP_SETGID capability. */ | |
2862 | if ((cap & CAP_SETGID) && | |
2863 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
2864 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) { | |
2865 | DEBUG("The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE " | |
0fd73091 | 2866 | "and CAP_PERMITTED sets", path); |
3275932b | 2867 | return 1; |
df6a2945 | 2868 | } |
0fd73091 | 2869 | #else |
69924fff CB |
2870 | /* If we cannot check for file capabilities we need to give the benefit |
2871 | * of the doubt. Otherwise we might fail even though all the necessary | |
2872 | * file capabilities are set. | |
2873 | */ | |
ffc40301 | 2874 | DEBUG("Cannot check for file capabilities as full capability support is " |
0fd73091 | 2875 | "missing. Manual intervention needed"); |
0fd73091 | 2876 | #endif |
df6a2945 | 2877 | |
3275932b | 2878 | return 1; |
df6a2945 CB |
2879 | } |
2880 | ||
986ef930 CB |
2881 | int lxc_map_ids_exec_wrapper(void *args) |
2882 | { | |
2883 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
2884 | return -1; | |
2885 | } | |
2886 | ||
f6d3e3e4 SH |
2887 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) |
2888 | { | |
0fd73091 | 2889 | int fill, left; |
986ef930 | 2890 | char u_or_g; |
4bc3b759 | 2891 | char *pos; |
6b5a54cd | 2892 | char cmd_output[PATH_MAX]; |
0fd73091 CB |
2893 | struct id_map *map; |
2894 | struct lxc_list *iterator; | |
2895 | enum idtype type; | |
986ef930 CB |
2896 | /* strlen("new@idmap") = 9 |
2897 | * + | |
2898 | * strlen(" ") = 1 | |
2899 | * + | |
d33968ad | 2900 | * INTTYPE_TO_STRLEN(uint32_t) |
986ef930 CB |
2901 | * + |
2902 | * strlen(" ") = 1 | |
2903 | * | |
2904 | * We add some additional space to make sure that we really have | |
2905 | * LXC_IDMAPLEN bytes available for our the {g,u]id mapping. | |
2906 | */ | |
0fd73091 | 2907 | int ret = 0, gidmap = 0, uidmap = 0; |
d33968ad | 2908 | char mapbuf[9 + 1 + INTTYPE_TO_STRLEN(uint32_t) + 1 + LXC_IDMAPLEN] = {0}; |
0fd73091 | 2909 | bool had_entry = false, use_shadow = false; |
c724025c JC |
2910 | int hostuid, hostgid; |
2911 | ||
2912 | hostuid = geteuid(); | |
2913 | hostgid = getegid(); | |
df6a2945 CB |
2914 | |
2915 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid | |
2916 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
2917 | * will protected it by preventing another user from being handed the |
2918 | * range by shadow. | |
2919 | */ | |
df6a2945 | 2920 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
2921 | if (uidmap == -ENOENT) |
2922 | WARN("newuidmap binary is missing"); | |
2923 | else if (!uidmap) | |
2924 | WARN("newuidmap is lacking necessary privileges"); | |
2925 | ||
df6a2945 | 2926 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
2927 | if (gidmap == -ENOENT) |
2928 | WARN("newgidmap binary is missing"); | |
2929 | else if (!gidmap) | |
2930 | WARN("newgidmap is lacking necessary privileges"); | |
2931 | ||
df6a2945 | 2932 | if (uidmap > 0 && gidmap > 0) { |
0fd73091 | 2933 | DEBUG("Functional newuidmap and newgidmap binary found"); |
4bc3b759 | 2934 | use_shadow = true; |
df6a2945 | 2935 | } else { |
99d43365 CB |
2936 | /* In case unprivileged users run application containers via |
2937 | * execute() or a start*() there are valid cases where they may | |
2938 | * only want to map their own {g,u}id. Let's not block them from | |
2939 | * doing so by requiring geteuid() == 0. | |
2940 | */ | |
2941 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
c724025c JC |
2942 | "write directly with euid %d", hostuid); |
2943 | } | |
2944 | ||
2945 | /* Check if we really need to use newuidmap and newgidmap. | |
2946 | * If the user is only remapping his own {g,u}id, we don't need it. | |
2947 | */ | |
2948 | if (use_shadow && lxc_list_len(idmap) == 2) { | |
2949 | use_shadow = false; | |
2950 | lxc_list_for_each(iterator, idmap) { | |
2951 | map = iterator->elem; | |
2952 | if (map->idtype == ID_TYPE_UID && map->range == 1 && | |
2953 | map->nsid == hostuid && map->hostid == hostuid) | |
2954 | continue; | |
2955 | if (map->idtype == ID_TYPE_GID && map->range == 1 && | |
2956 | map->nsid == hostgid && map->hostid == hostgid) | |
2957 | continue; | |
2958 | use_shadow = true; | |
2959 | break; | |
2960 | } | |
0e6e3a41 | 2961 | } |
251d0d2a | 2962 | |
986ef930 CB |
2963 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
2964 | type++, u_or_g = 'g') { | |
2965 | pos = mapbuf; | |
2966 | ||
0e6e3a41 | 2967 | if (use_shadow) |
986ef930 | 2968 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 2969 | |
cf3ef16d | 2970 | lxc_list_for_each(iterator, idmap) { |
251d0d2a | 2971 | map = iterator->elem; |
cf3ef16d SH |
2972 | if (map->idtype != type) |
2973 | continue; | |
2974 | ||
4bc3b759 CB |
2975 | had_entry = true; |
2976 | ||
986ef930 | 2977 | left = LXC_IDMAPLEN - (pos - mapbuf); |
d1838f34 | 2978 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
2979 | use_shadow ? " " : "", map->nsid, |
2980 | map->hostid, map->range, | |
0e6e3a41 | 2981 | use_shadow ? "" : "\n"); |
a427e268 CB |
2982 | if (fill <= 0 || fill >= left) { |
2983 | /* The kernel only takes <= 4k for writes to | |
2984 | * /proc/<pid>/{g,u}id_map | |
2985 | */ | |
2986 | SYSERROR("Too many %cid mappings defined", u_or_g); | |
2987 | return -1; | |
2988 | } | |
4bc3b759 | 2989 | |
cf3ef16d | 2990 | pos += fill; |
251d0d2a | 2991 | } |
cf3ef16d | 2992 | if (!had_entry) |
4f7521b4 | 2993 | continue; |
cf3ef16d | 2994 | |
d85813cd | 2995 | /* Try to catch the output of new{g,u}idmap to make debugging |
986ef930 CB |
2996 | * easier. |
2997 | */ | |
2998 | if (use_shadow) { | |
2999 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3000 | lxc_map_ids_exec_wrapper, | |
3001 | (void *)mapbuf); | |
3002 | if (ret < 0) { | |
54fbbeb5 CB |
3003 | ERROR("new%cidmap failed to write mapping \"%s\": %s", |
3004 | u_or_g, cmd_output, mapbuf); | |
986ef930 CB |
3005 | return -1; |
3006 | } | |
54fbbeb5 | 3007 | TRACE("new%cidmap wrote mapping \"%s\"", u_or_g, mapbuf); |
d1838f34 | 3008 | } else { |
986ef930 | 3009 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
54fbbeb5 | 3010 | if (ret < 0) { |
da0f9977 | 3011 | ERROR("Failed to write mapping: %s", mapbuf); |
986ef930 | 3012 | return -1; |
54fbbeb5 CB |
3013 | } |
3014 | TRACE("Wrote mapping \"%s\"", mapbuf); | |
d1838f34 | 3015 | } |
986ef930 CB |
3016 | |
3017 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 3018 | } |
251d0d2a | 3019 | |
986ef930 | 3020 | return 0; |
f6d3e3e4 SH |
3021 | } |
3022 | ||
0fd73091 | 3023 | /* Return the host uid/gid to which the container root is mapped in val. |
0b3a6504 | 3024 | * Return true if id was found, false otherwise. |
cf3ef16d | 3025 | */ |
2a9a80cb | 3026 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
4160c3a0 | 3027 | unsigned long *val) |
cf3ef16d | 3028 | { |
4160c3a0 | 3029 | unsigned nsid; |
0fd73091 CB |
3030 | struct id_map *map; |
3031 | struct lxc_list *it; | |
4160c3a0 CB |
3032 | |
3033 | if (idtype == ID_TYPE_UID) | |
3034 | nsid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; | |
3035 | else | |
3036 | nsid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
cf3ef16d | 3037 | |
0fd73091 | 3038 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 3039 | map = it->elem; |
7b50c609 | 3040 | if (map->idtype != idtype) |
cf3ef16d | 3041 | continue; |
4160c3a0 | 3042 | if (map->nsid != nsid) |
cf3ef16d | 3043 | continue; |
2a9a80cb SH |
3044 | *val = map->hostid; |
3045 | return true; | |
cf3ef16d | 3046 | } |
4160c3a0 | 3047 | |
2a9a80cb | 3048 | return false; |
cf3ef16d SH |
3049 | } |
3050 | ||
2133f58c | 3051 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3052 | { |
cf3ef16d | 3053 | struct id_map *map; |
0fd73091 CB |
3054 | struct lxc_list *it; |
3055 | ||
3056 | lxc_list_for_each (it, &conf->id_map) { | |
cf3ef16d | 3057 | map = it->elem; |
2133f58c | 3058 | if (map->idtype != idtype) |
cf3ef16d | 3059 | continue; |
0fd73091 | 3060 | |
cf3ef16d | 3061 | if (id >= map->hostid && id < map->hostid + map->range) |
57d116ab | 3062 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 3063 | } |
0fd73091 | 3064 | |
57d116ab | 3065 | return -1; |
cf3ef16d SH |
3066 | } |
3067 | ||
339efad9 | 3068 | int find_unmapped_nsid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3069 | { |
cf3ef16d | 3070 | struct id_map *map; |
0fd73091 | 3071 | struct lxc_list *it; |
2133f58c | 3072 | unsigned int freeid = 0; |
0fd73091 | 3073 | |
cf3ef16d | 3074 | again: |
0fd73091 | 3075 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 3076 | map = it->elem; |
2133f58c | 3077 | if (map->idtype != idtype) |
cf3ef16d | 3078 | continue; |
0fd73091 | 3079 | |
cf3ef16d SH |
3080 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { |
3081 | freeid = map->nsid + map->range; | |
3082 | goto again; | |
3083 | } | |
3084 | } | |
0fd73091 | 3085 | |
cf3ef16d SH |
3086 | return freeid; |
3087 | } | |
3088 | ||
f4f52cb5 CB |
3089 | int chown_mapped_root_exec_wrapper(void *args) |
3090 | { | |
3091 | execvp("lxc-usernsexec", args); | |
3092 | return -1; | |
3093 | } | |
3094 | ||
0fd73091 | 3095 | /* chown_mapped_root: for an unprivileged user with uid/gid X to |
7b50c609 TS |
3096 | * chown a dir to subuid/subgid Y, he needs to run chown as root |
3097 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
3098 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
3099 | * root is privileged with respect to hostuid/hostgid X, allowing | |
3100 | * him to do the chown. | |
f6d3e3e4 | 3101 | */ |
41dc7155 | 3102 | int chown_mapped_root(const char *path, struct lxc_conf *conf) |
f6d3e3e4 | 3103 | { |
f4f52cb5 | 3104 | uid_t rootuid, rootgid; |
2a9a80cb | 3105 | unsigned long val; |
f4f52cb5 CB |
3106 | int hostuid, hostgid, ret; |
3107 | struct stat sb; | |
3108 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
3109 | char ugid[100]; | |
41dc7155 | 3110 | const char *args1[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3111 | "-m", map1, |
3112 | "-m", map2, | |
3113 | "-m", map3, | |
3114 | "-m", map5, | |
3115 | "--", "chown", ugid, path, | |
3116 | NULL}; | |
41dc7155 | 3117 | const char *args2[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3118 | "-m", map1, |
3119 | "-m", map2, | |
3120 | "-m", map3, | |
3121 | "-m", map4, | |
3122 | "-m", map5, | |
3123 | "--", "chown", ugid, path, | |
3124 | NULL}; | |
6b5a54cd | 3125 | char cmd_output[PATH_MAX]; |
f4f52cb5 CB |
3126 | |
3127 | hostuid = geteuid(); | |
3128 | hostgid = getegid(); | |
f6d3e3e4 | 3129 | |
2a9a80cb | 3130 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
bc80f098 | 3131 | ERROR("No uid mapping for container root"); |
c4d10a05 | 3132 | return -1; |
f6d3e3e4 | 3133 | } |
f4f52cb5 | 3134 | rootuid = (uid_t)val; |
0fd73091 | 3135 | |
7b50c609 | 3136 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { |
bc80f098 | 3137 | ERROR("No gid mapping for container root"); |
7b50c609 TS |
3138 | return -1; |
3139 | } | |
f4f52cb5 | 3140 | rootgid = (gid_t)val; |
2a9a80cb | 3141 | |
f4f52cb5 | 3142 | if (hostuid == 0) { |
7b50c609 | 3143 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3144 | ERROR("Error chowning %s", path); |
3145 | return -1; | |
3146 | } | |
0fd73091 | 3147 | |
c4d10a05 SH |
3148 | return 0; |
3149 | } | |
f3d7e4ca | 3150 | |
f4f52cb5 | 3151 | if (rootuid == hostuid) { |
1a0e70ac | 3152 | /* nothing to do */ |
b103ceac | 3153 | INFO("Container root is our uid; no need to chown"); |
f3d7e4ca SH |
3154 | return 0; |
3155 | } | |
3156 | ||
bbdbf8f0 | 3157 | /* save the current gid of "path" */ |
f4f52cb5 CB |
3158 | if (stat(path, &sb) < 0) { |
3159 | ERROR("Error stat %s", path); | |
f6d3e3e4 SH |
3160 | return -1; |
3161 | } | |
7b50c609 | 3162 | |
bbdbf8f0 CB |
3163 | /* Update the path argument in case this was overlayfs. */ |
3164 | args1[sizeof(args1) / sizeof(args1[0]) - 2] = path; | |
3165 | args2[sizeof(args2) / sizeof(args2[0]) - 2] = path; | |
3166 | ||
f4f52cb5 CB |
3167 | /* |
3168 | * A file has to be group-owned by a gid mapped into the | |
3169 | * container, or the container won't be privileged over it. | |
3170 | */ | |
3171 | DEBUG("trying to chown \"%s\" to %d", path, hostgid); | |
3172 | if (sb.st_uid == hostuid && | |
3173 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3174 | chown(path, -1, hostgid) < 0) { | |
3175 | ERROR("Failed chgrping %s", path); | |
3176 | return -1; | |
3177 | } | |
f6d3e3e4 | 3178 | |
1a0e70ac | 3179 | /* "u:0:rootuid:1" */ |
f4f52cb5 CB |
3180 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); |
3181 | if (ret < 0 || ret >= 100) { | |
3182 | ERROR("Error uid printing map string"); | |
3183 | return -1; | |
3184 | } | |
7b50c609 | 3185 | |
1a0e70ac | 3186 | /* "u:hostuid:hostuid:1" */ |
f4f52cb5 CB |
3187 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); |
3188 | if (ret < 0 || ret >= 100) { | |
3189 | ERROR("Error uid printing map string"); | |
3190 | return -1; | |
3191 | } | |
c4d10a05 | 3192 | |
1a0e70ac | 3193 | /* "g:0:rootgid:1" */ |
f4f52cb5 CB |
3194 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); |
3195 | if (ret < 0 || ret >= 100) { | |
3196 | ERROR("Error gid printing map string"); | |
3197 | return -1; | |
3198 | } | |
98e5ba51 | 3199 | |
1a0e70ac | 3200 | /* "g:pathgid:rootgid+pathgid:1" */ |
f4f52cb5 CB |
3201 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, |
3202 | rootgid + (gid_t)sb.st_gid); | |
3203 | if (ret < 0 || ret >= 100) { | |
3204 | ERROR("Error gid printing map string"); | |
3205 | return -1; | |
3206 | } | |
c4d10a05 | 3207 | |
1a0e70ac | 3208 | /* "g:hostgid:hostgid:1" */ |
f4f52cb5 CB |
3209 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); |
3210 | if (ret < 0 || ret >= 100) { | |
3211 | ERROR("Error gid printing map string"); | |
3212 | return -1; | |
3213 | } | |
7b50c609 | 3214 | |
1a0e70ac | 3215 | /* "0:pathgid" (chown) */ |
f4f52cb5 CB |
3216 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); |
3217 | if (ret < 0 || ret >= 100) { | |
3218 | ERROR("Error owner printing format string for chown"); | |
3219 | return -1; | |
3220 | } | |
7b50c609 | 3221 | |
f4f52cb5 CB |
3222 | if (hostgid == sb.st_gid) |
3223 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3224 | chown_mapped_root_exec_wrapper, | |
3225 | (void *)args1); | |
3226 | else | |
3227 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3228 | chown_mapped_root_exec_wrapper, | |
3229 | (void *)args2); | |
3230 | if (ret < 0) | |
3231 | ERROR("lxc-usernsexec failed: %s", cmd_output); | |
7b50c609 | 3232 | |
f4f52cb5 | 3233 | return ret; |
f6d3e3e4 SH |
3234 | } |
3235 | ||
943144d9 CB |
3236 | /* NOTE: Must not be called from inside the container namespace! */ |
3237 | int lxc_create_tmp_proc_mount(struct lxc_conf *conf) | |
5112cd70 SH |
3238 | { |
3239 | int mounted; | |
3240 | ||
943144d9 | 3241 | mounted = lxc_mount_proc_if_needed(conf->rootfs.path ? conf->rootfs.mount : ""); |
5112cd70 | 3242 | if (mounted == -1) { |
0fd73091 | 3243 | SYSERROR("Failed to mount proc in the container"); |
01958b1f | 3244 | /* continue only if there is no rootfs */ |
943144d9 | 3245 | if (conf->rootfs.path) |
01958b1f | 3246 | return -1; |
5112cd70 | 3247 | } else if (mounted == 1) { |
7a0bcca3 | 3248 | conf->tmp_umount_proc = true; |
5112cd70 | 3249 | } |
943144d9 | 3250 | |
5112cd70 SH |
3251 | return 0; |
3252 | } | |
3253 | ||
3254 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3255 | { | |
7a0bcca3 | 3256 | if (!lxc_conf->tmp_umount_proc) |
0fd73091 CB |
3257 | return; |
3258 | ||
7a0bcca3 CB |
3259 | (void)umount2("/proc", MNT_DETACH); |
3260 | lxc_conf->tmp_umount_proc = false; | |
5112cd70 SH |
3261 | } |
3262 | ||
0fd73091 | 3263 | /* Walk /proc/mounts and change any shared entries to slave. */ |
6a0c909a | 3264 | void remount_all_slave(void) |
e995d7a2 | 3265 | { |
7969675f | 3266 | __do_free char *line = NULL; |
003be47b CB |
3267 | __do_fclose FILE *f = NULL; |
3268 | __do_close_prot_errno int memfd = -EBADF, mntinfo_fd = -EBADF; | |
3269 | int ret; | |
6a49f05e | 3270 | ssize_t copied; |
e995d7a2 SH |
3271 | size_t len = 0; |
3272 | ||
6a49f05e | 3273 | mntinfo_fd = open("/proc/self/mountinfo", O_RDONLY | O_CLOEXEC); |
fea3b91d DJ |
3274 | if (mntinfo_fd < 0) { |
3275 | SYSERROR("Failed to open \"/proc/self/mountinfo\""); | |
6a49f05e | 3276 | return; |
fea3b91d | 3277 | } |
6a49f05e CB |
3278 | |
3279 | memfd = memfd_create(".lxc_mountinfo", MFD_CLOEXEC); | |
3280 | if (memfd < 0) { | |
3281 | char template[] = P_tmpdir "/.lxc_mountinfo_XXXXXX"; | |
3282 | ||
3283 | if (errno != ENOSYS) { | |
fea3b91d | 3284 | SYSERROR("Failed to create temporary in-memory file"); |
6a49f05e CB |
3285 | return; |
3286 | } | |
3287 | ||
3288 | memfd = lxc_make_tmpfile(template, true); | |
fea3b91d | 3289 | if (memfd < 0) { |
fea3b91d DJ |
3290 | WARN("Failed to create temporary file"); |
3291 | return; | |
3292 | } | |
6a49f05e CB |
3293 | } |
3294 | ||
6a49f05e | 3295 | again: |
7c4d9466 | 3296 | copied = lxc_sendfile_nointr(memfd, mntinfo_fd, NULL, LXC_SENDFILE_MAX); |
6a49f05e CB |
3297 | if (copied < 0) { |
3298 | if (errno == EINTR) | |
3299 | goto again; | |
3300 | ||
fea3b91d | 3301 | SYSERROR("Failed to copy \"/proc/self/mountinfo\""); |
6a49f05e CB |
3302 | return; |
3303 | } | |
6a49f05e | 3304 | |
6a49f05e CB |
3305 | ret = lseek(memfd, 0, SEEK_SET); |
3306 | if (ret < 0) { | |
fea3b91d | 3307 | SYSERROR("Failed to reset file descriptor offset"); |
6a49f05e CB |
3308 | return; |
3309 | } | |
3310 | ||
4110345b | 3311 | f = fdopen(memfd, "re"); |
e995d7a2 | 3312 | if (!f) { |
003be47b | 3313 | SYSERROR("Failed to open copy of \"/proc/self/mountinfo\" to mark all shared. Continuing"); |
e995d7a2 SH |
3314 | return; |
3315 | } | |
3316 | ||
003be47b CB |
3317 | /* |
3318 | * After a successful fdopen() memfd will be closed when calling | |
3319 | * fclose(f). Calling close(memfd) afterwards is undefined. | |
3320 | */ | |
3321 | move_fd(memfd); | |
3322 | ||
e995d7a2 | 3323 | while (getline(&line, &len, f) != -1) { |
0fd73091 CB |
3324 | char *opts, *target; |
3325 | ||
e995d7a2 SH |
3326 | target = get_field(line, 4); |
3327 | if (!target) | |
3328 | continue; | |
0fd73091 | 3329 | |
e995d7a2 SH |
3330 | opts = get_field(target, 2); |
3331 | if (!opts) | |
3332 | continue; | |
0fd73091 | 3333 | |
e995d7a2 SH |
3334 | null_endofword(opts); |
3335 | if (!strstr(opts, "shared")) | |
3336 | continue; | |
0fd73091 | 3337 | |
e995d7a2 | 3338 | null_endofword(target); |
0fd73091 CB |
3339 | ret = mount(NULL, target, NULL, MS_SLAVE, NULL); |
3340 | if (ret < 0) { | |
3341 | SYSERROR("Failed to make \"%s\" MS_SLAVE", target); | |
e995d7a2 | 3342 | ERROR("Continuing..."); |
6a49f05e | 3343 | continue; |
e995d7a2 | 3344 | } |
6a49f05e | 3345 | TRACE("Remounted \"%s\" as MS_SLAVE", target); |
e995d7a2 | 3346 | } |
6a49f05e | 3347 | TRACE("Remounted all mount table entries as MS_SLAVE"); |
e995d7a2 SH |
3348 | } |
3349 | ||
794248d0 | 3350 | static int lxc_execute_bind_init(struct lxc_handler *handler) |
2322903b SH |
3351 | { |
3352 | int ret; | |
794248d0 CB |
3353 | char *p; |
3354 | char path[PATH_MAX], destpath[PATH_MAX]; | |
3355 | struct lxc_conf *conf = handler->conf; | |
9d9c111c SH |
3356 | |
3357 | /* If init exists in the container, don't bind mount a static one */ | |
3358 | p = choose_init(conf->rootfs.mount); | |
3359 | if (p) { | |
22f835ba | 3360 | __do_free char *old = p; |
41089848 TA |
3361 | |
3362 | p = strdup(old + strlen(conf->rootfs.mount)); | |
41089848 TA |
3363 | if (!p) |
3364 | return -ENOMEM; | |
3365 | ||
3366 | INFO("Found existing init at \"%s\"", p); | |
3367 | goto out; | |
9d9c111c | 3368 | } |
2322903b SH |
3369 | |
3370 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
0fd73091 | 3371 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3372 | return -1; |
2322903b SH |
3373 | |
3374 | if (!file_exists(path)) { | |
0fd73091 | 3375 | ERROR("The file \"%s\" does not exist on host", path); |
8353b4c9 | 3376 | return -1; |
2322903b SH |
3377 | } |
3378 | ||
794248d0 | 3379 | ret = snprintf(destpath, PATH_MAX, "%s" P_tmpdir "%s", conf->rootfs.mount, "/.lxc-init"); |
0fd73091 | 3380 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3381 | return -1; |
2322903b SH |
3382 | |
3383 | if (!file_exists(destpath)) { | |
794248d0 CB |
3384 | ret = mknod(destpath, S_IFREG | 0000, 0); |
3385 | if (ret < 0 && errno != EEXIST) { | |
3386 | SYSERROR("Failed to create dummy \"%s\" file as bind mount target", destpath); | |
8353b4c9 | 3387 | return -1; |
2322903b | 3388 | } |
2322903b SH |
3389 | } |
3390 | ||
592fd47a | 3391 | ret = safe_mount(path, destpath, "none", MS_BIND, NULL, conf->rootfs.mount); |
8353b4c9 | 3392 | if (ret < 0) { |
0fd73091 | 3393 | SYSERROR("Failed to bind mount lxc.init.static into container"); |
8353b4c9 CB |
3394 | return -1; |
3395 | } | |
3396 | ||
794248d0 CB |
3397 | p = strdup(destpath + strlen(conf->rootfs.mount)); |
3398 | if (!p) | |
3399 | return -ENOMEM; | |
794248d0 | 3400 | |
8353b4c9 | 3401 | INFO("Bind mounted lxc.init.static into container at \"%s\"", path); |
41089848 | 3402 | out: |
4b5b3a2a | 3403 | ((struct execute_args *)handler->data)->init_fd = -1; |
41089848 | 3404 | ((struct execute_args *)handler->data)->init_path = p; |
8353b4c9 | 3405 | return 0; |
2322903b SH |
3406 | } |
3407 | ||
0fd73091 CB |
3408 | /* This does the work of remounting / if it is shared, calling the container |
3409 | * pre-mount hooks, and mounting the rootfs. | |
35120d9c | 3410 | */ |
8ce1abc2 CB |
3411 | int lxc_setup_rootfs_prepare_root(struct lxc_conf *conf, const char *name, |
3412 | const char *lxcpath) | |
0ad19a3f | 3413 | { |
0fd73091 CB |
3414 | int ret; |
3415 | ||
35120d9c | 3416 | if (conf->rootfs_setup) { |
35120d9c | 3417 | const char *path = conf->rootfs.mount; |
0fd73091 CB |
3418 | |
3419 | /* The rootfs was set up in another namespace. bind-mount it to | |
3420 | * give us a mount in our own ns so we can pivot_root to it | |
3421 | */ | |
3422 | ret = mount(path, path, "rootfs", MS_BIND, NULL); | |
3423 | if (ret < 0) { | |
3424 | ERROR("Failed to bind mount container / onto itself"); | |
145832ba | 3425 | return -1; |
35120d9c | 3426 | } |
0fd73091 CB |
3427 | |
3428 | TRACE("Bind mounted container / onto itself"); | |
145832ba | 3429 | return 0; |
35120d9c | 3430 | } |
d4ef7c50 | 3431 | |
e995d7a2 SH |
3432 | remount_all_slave(); |
3433 | ||
0fd73091 CB |
3434 | ret = run_lxc_hooks(name, "pre-mount", conf, NULL); |
3435 | if (ret < 0) { | |
3436 | ERROR("Failed to run pre-mount hooks"); | |
35120d9c SH |
3437 | return -1; |
3438 | } | |
3439 | ||
8ce1abc2 | 3440 | ret = lxc_mount_rootfs(conf); |
0fd73091 CB |
3441 | if (ret < 0) { |
3442 | ERROR("Failed to setup rootfs for"); | |
35120d9c SH |
3443 | return -1; |
3444 | } | |
3445 | ||
3446 | conf->rootfs_setup = true; | |
3447 | return 0; | |
3448 | } | |
3449 | ||
1c1c7051 SH |
3450 | static bool verify_start_hooks(struct lxc_conf *conf) |
3451 | { | |
6b5a54cd | 3452 | char path[PATH_MAX]; |
0fd73091 CB |
3453 | struct lxc_list *it; |
3454 | ||
3455 | lxc_list_for_each (it, &conf->hooks[LXCHOOK_START]) { | |
1c1c7051 | 3456 | int ret; |
0fd73091 | 3457 | char *hookname = it->elem; |
1c1c7051 | 3458 | |
6b5a54cd | 3459 | ret = snprintf(path, PATH_MAX, "%s%s", |
0fd73091 CB |
3460 | conf->rootfs.path ? conf->rootfs.mount : "", |
3461 | hookname); | |
6b5a54cd | 3462 | if (ret < 0 || ret >= PATH_MAX) |
1c1c7051 | 3463 | return false; |
0fd73091 | 3464 | |
75193660 | 3465 | ret = access(path, X_OK); |
0fd73091 | 3466 | if (ret < 0) { |
75193660 | 3467 | SYSERROR("Start hook \"%s\" not found in container", |
0fd73091 | 3468 | hookname); |
1c1c7051 SH |
3469 | return false; |
3470 | } | |
0fd73091 | 3471 | |
6a0c909a | 3472 | return true; |
1c1c7051 SH |
3473 | } |
3474 | ||
3475 | return true; | |
3476 | } | |
3477 | ||
4b5b3a2a TA |
3478 | static bool execveat_supported(void) |
3479 | { | |
13be2733 | 3480 | lxc_raw_execveat(-1, "", NULL, NULL, AT_EMPTY_PATH); |
4b5b3a2a TA |
3481 | if (errno == ENOSYS) |
3482 | return false; | |
3483 | ||
3484 | return true; | |
4b5b3a2a TA |
3485 | } |
3486 | ||
20502652 CB |
3487 | static int lxc_setup_boot_id(void) |
3488 | { | |
3489 | int ret; | |
3490 | const char *boot_id_path = "/proc/sys/kernel/random/boot_id"; | |
3491 | const char *mock_boot_id_path = "/dev/.lxc-boot-id"; | |
3492 | lxc_id128_t n; | |
3493 | ||
3494 | if (access(boot_id_path, F_OK)) | |
3495 | return 0; | |
3496 | ||
3497 | memset(&n, 0, sizeof(n)); | |
3498 | if (lxc_id128_randomize(&n)) { | |
3499 | SYSERROR("Failed to generate random data for uuid"); | |
3500 | return -1; | |
3501 | } | |
3502 | ||
3503 | ret = lxc_id128_write(mock_boot_id_path, n); | |
3504 | if (ret < 0) { | |
3505 | SYSERROR("Failed to write uuid to %s", mock_boot_id_path); | |
3506 | return -1; | |
3507 | } | |
3508 | ||
3509 | ret = chmod(mock_boot_id_path, 0444); | |
3510 | if (ret < 0) { | |
3511 | SYSERROR("Failed to chown %s", mock_boot_id_path); | |
3512 | (void)unlink(mock_boot_id_path); | |
3513 | return -1; | |
3514 | } | |
3515 | ||
3516 | ret = mount(mock_boot_id_path, boot_id_path, NULL, MS_BIND, NULL); | |
3517 | if (ret < 0) { | |
3518 | SYSERROR("Failed to mount %s to %s", mock_boot_id_path, | |
3519 | boot_id_path); | |
3520 | (void)unlink(mock_boot_id_path); | |
3521 | return -1; | |
3522 | } | |
3523 | ||
3524 | ret = mount(NULL, boot_id_path, NULL, | |
3525 | (MS_BIND | MS_REMOUNT | MS_RDONLY | MS_NOSUID | MS_NOEXEC | | |
3526 | MS_NODEV), | |
3527 | NULL); | |
3528 | if (ret < 0) { | |
3529 | SYSERROR("Failed to remount %s read-only", boot_id_path); | |
3530 | (void)unlink(mock_boot_id_path); | |
3531 | return -1; | |
3532 | } | |
3533 | ||
3534 | return 0; | |
3535 | } | |
3536 | ||
3b988b33 | 3537 | int lxc_setup(struct lxc_handler *handler) |
35120d9c | 3538 | { |
2187efd3 | 3539 | int ret; |
0fd73091 | 3540 | const char *lxcpath = handler->lxcpath, *name = handler->name; |
35120d9c | 3541 | struct lxc_conf *lxc_conf = handler->conf; |
4fef78bc | 3542 | char *keyring_context = NULL; |
35120d9c | 3543 | |
8ce1abc2 | 3544 | ret = lxc_setup_rootfs_prepare_root(lxc_conf, name, lxcpath); |
8353b4c9 CB |
3545 | if (ret < 0) { |
3546 | ERROR("Failed to setup rootfs"); | |
35120d9c SH |
3547 | return -1; |
3548 | } | |
3549 | ||
28d9e29e | 3550 | if (handler->nsfd[LXC_NS_UTS] == -1) { |
8353b4c9 CB |
3551 | ret = setup_utsname(lxc_conf->utsname); |
3552 | if (ret < 0) { | |
0fd73091 | 3553 | ERROR("Failed to setup the utsname %s", name); |
6c544cb3 MM |
3554 | return -1; |
3555 | } | |
0ad19a3f | 3556 | } |
3557 | ||
8f818a84 MB |
3558 | if (!lxc_conf->keyring_disable_session) { |
3559 | if (lxc_conf->lsm_se_keyring_context) { | |
3560 | keyring_context = lxc_conf->lsm_se_keyring_context; | |
3561 | } else if (lxc_conf->lsm_se_context) { | |
3562 | keyring_context = lxc_conf->lsm_se_context; | |
3563 | } | |
4fef78bc | 3564 | |
8f818a84 MB |
3565 | ret = lxc_setup_keyring(keyring_context); |
3566 | if (ret < 0) | |
3567 | return -1; | |
3568 | } | |
b25291da | 3569 | |
e389f2af CB |
3570 | if (handler->ns_clone_flags & CLONE_NEWNET) { |
3571 | ret = lxc_setup_network_in_child_namespaces(lxc_conf, | |
3572 | &lxc_conf->network); | |
3573 | if (ret < 0) { | |
3574 | ERROR("Failed to setup network"); | |
3575 | return -1; | |
3576 | } | |
0ad19a3f | 3577 | |
e389f2af CB |
3578 | ret = lxc_network_send_name_and_ifindex_to_parent(handler); |
3579 | if (ret < 0) { | |
3580 | ERROR("Failed to send network device names and ifindices to parent"); | |
3581 | return -1; | |
3582 | } | |
790255cf CB |
3583 | } |
3584 | ||
bc6928ff | 3585 | if (lxc_conf->autodev > 0) { |
63012bdd | 3586 | ret = mount_autodev(name, &lxc_conf->rootfs, lxc_conf->autodevtmpfssize, lxcpath); |
8353b4c9 CB |
3587 | if (ret < 0) { |
3588 | ERROR("Failed to mount \"/dev\""); | |
c6883f38 SH |
3589 | return -1; |
3590 | } | |
3591 | } | |
3592 | ||
8353b4c9 CB |
3593 | /* Do automatic mounts (mainly /proc and /sys), but exclude those that |
3594 | * need to wait until other stuff has finished. | |
368bbc02 | 3595 | */ |
8353b4c9 CB |
3596 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler); |
3597 | if (ret < 0) { | |
3598 | ERROR("Failed to setup first automatic mounts"); | |
368bbc02 CS |
3599 | return -1; |
3600 | } | |
3601 | ||
8353b4c9 CB |
3602 | ret = setup_mount(lxc_conf, &lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath); |
3603 | if (ret < 0) { | |
3604 | ERROR("Failed to setup mounts"); | |
95b5ffaf | 3605 | return -1; |
576f946d | 3606 | } |
3607 | ||
c631115d FA |
3608 | if (!lxc_list_empty(&lxc_conf->mount_list)) { |
3609 | ret = setup_mount_entries(lxc_conf, &lxc_conf->rootfs, | |
3610 | &lxc_conf->mount_list, name, lxcpath); | |
3611 | if (ret < 0) { | |
3612 | ERROR("Failed to setup mount entries"); | |
3613 | return -1; | |
3614 | } | |
3615 | } | |
3616 | ||
8353b4c9 | 3617 | if (lxc_conf->is_execute) { |
4b5b3a2a TA |
3618 | if (execveat_supported()) { |
3619 | int fd; | |
3620 | char path[PATH_MAX]; | |
3621 | ||
3622 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
3623 | if (ret < 0 || ret >= PATH_MAX) { | |
3624 | ERROR("Path to init.lxc.static too long"); | |
3625 | return -1; | |
3626 | } | |
3627 | ||
3628 | fd = open(path, O_PATH | O_CLOEXEC); | |
3629 | if (fd < 0) { | |
3630 | SYSERROR("Unable to open lxc.init.static"); | |
3631 | return -1; | |
3632 | } | |
3633 | ||
3634 | ((struct execute_args *)handler->data)->init_fd = fd; | |
3635 | ((struct execute_args *)handler->data)->init_path = NULL; | |
3636 | } else { | |
3637 | ret = lxc_execute_bind_init(handler); | |
3638 | if (ret < 0) { | |
3639 | ERROR("Failed to bind-mount the lxc init system"); | |
3640 | return -1; | |
3641 | } | |
8353b4c9 CB |
3642 | } |
3643 | } | |
2322903b | 3644 | |
8353b4c9 CB |
3645 | /* Now mount only cgroups, if wanted. Before, /sys could not have been |
3646 | * mounted. It is guaranteed to be mounted now either through | |
3647 | * automatically or via fstab entries. | |
368bbc02 | 3648 | */ |
8353b4c9 CB |
3649 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler); |
3650 | if (ret < 0) { | |
3651 | ERROR("Failed to setup remaining automatic mounts"); | |
368bbc02 CS |
3652 | return -1; |
3653 | } | |
3654 | ||
8353b4c9 | 3655 | ret = run_lxc_hooks(name, "mount", lxc_conf, NULL); |
1a2cf89d | 3656 | if (ret < 0) { |
8353b4c9 | 3657 | ERROR("Failed to run mount hooks"); |
773fb9ca SH |
3658 | return -1; |
3659 | } | |
3660 | ||
bc6928ff | 3661 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3662 | ret = run_lxc_hooks(name, "autodev", lxc_conf, NULL); |
3663 | if (ret < 0) { | |
3664 | ERROR("Failed to run autodev hooks"); | |
f7bee6c6 MW |
3665 | return -1; |
3666 | } | |
06749971 | 3667 | |
8353b4c9 CB |
3668 | ret = lxc_fill_autodev(&lxc_conf->rootfs); |
3669 | if (ret < 0) { | |
3670 | ERROR("Failed to populate \"/dev\""); | |
91c3830e SH |
3671 | return -1; |
3672 | } | |
3673 | } | |
368bbc02 | 3674 | |
75193660 CB |
3675 | /* Make sure any start hooks are in the container */ |
3676 | if (!verify_start_hooks(lxc_conf)) { | |
3677 | ERROR("Failed to verify start hooks"); | |
3678 | return -1; | |
3679 | } | |
3680 | ||
ed8704d0 | 3681 | ret = lxc_setup_console(&lxc_conf->rootfs, &lxc_conf->console, |
885766f5 | 3682 | lxc_conf->ttys.dir); |
ed8704d0 CB |
3683 | if (ret < 0) { |
3684 | ERROR("Failed to setup console"); | |
95b5ffaf | 3685 | return -1; |
6e590161 | 3686 | } |
3687 | ||
ed8704d0 CB |
3688 | ret = lxc_setup_dev_symlinks(&lxc_conf->rootfs); |
3689 | if (ret < 0) { | |
8353b4c9 | 3690 | ERROR("Failed to setup \"/dev\" symlinks"); |
69aa6655 DE |
3691 | return -1; |
3692 | } | |
3693 | ||
8353b4c9 CB |
3694 | ret = lxc_create_tmp_proc_mount(lxc_conf); |
3695 | if (ret < 0) { | |
3696 | ERROR("Failed to \"/proc\" LSMs"); | |
e075f5d9 | 3697 | return -1; |
e075f5d9 | 3698 | } |
e075f5d9 | 3699 | |
8ce1abc2 | 3700 | ret = lxc_setup_rootfs_switch_root(&lxc_conf->rootfs); |
8353b4c9 CB |
3701 | if (ret < 0) { |
3702 | ERROR("Failed to pivot root into rootfs"); | |
95b5ffaf | 3703 | return -1; |
ed502555 | 3704 | } |
3705 | ||
20502652 CB |
3706 | /* Setting the boot-id is best-effort for now. */ |
3707 | if (lxc_conf->autodev > 0) | |
3708 | (void)lxc_setup_boot_id(); | |
3709 | ||
8353b4c9 CB |
3710 | ret = lxc_setup_devpts(lxc_conf); |
3711 | if (ret < 0) { | |
3712 | ERROR("Failed to setup new devpts instance"); | |
95b5ffaf | 3713 | return -1; |
3c26f34e | 3714 | } |
3715 | ||
2187efd3 CB |
3716 | ret = lxc_create_ttys(handler); |
3717 | if (ret < 0) | |
e8bd4e43 | 3718 | return -1; |
e8bd4e43 | 3719 | |
8353b4c9 CB |
3720 | ret = setup_personality(lxc_conf->personality); |
3721 | if (ret < 0) { | |
3722 | ERROR("Failed to set personality"); | |
cccc74b5 DL |
3723 | return -1; |
3724 | } | |
3725 | ||
8353b4c9 CB |
3726 | /* Set sysctl value to a path under /proc/sys as determined from the |
3727 | * key. For e.g. net.ipv4.ip_forward translated to | |
3728 | * /proc/sys/net/ipv4/ip_forward. | |
7edd0540 L |
3729 | */ |
3730 | if (!lxc_list_empty(&lxc_conf->sysctls)) { | |
3731 | ret = setup_sysctl_parameters(&lxc_conf->sysctls); | |
8353b4c9 CB |
3732 | if (ret < 0) { |
3733 | ERROR("Failed to setup sysctl parameters"); | |
7edd0540 | 3734 | return -1; |
8353b4c9 | 3735 | } |
7edd0540 L |
3736 | } |
3737 | ||
97a8f74f SG |
3738 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
3739 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
8353b4c9 CB |
3740 | ERROR("Container requests lxc.cap.drop and " |
3741 | "lxc.cap.keep: either use lxc.cap.drop or " | |
3742 | "lxc.cap.keep, not both"); | |
f6d3e3e4 SH |
3743 | return -1; |
3744 | } | |
8353b4c9 | 3745 | |
97a8f74f | 3746 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
8353b4c9 | 3747 | ERROR("Failed to keep capabilities"); |
97a8f74f SG |
3748 | return -1; |
3749 | } | |
3750 | } else if (setup_caps(&lxc_conf->caps)) { | |
8353b4c9 | 3751 | ERROR("Failed to drop capabilities"); |
97a8f74f | 3752 | return -1; |
81810dd1 DL |
3753 | } |
3754 | ||
8353b4c9 | 3755 | NOTICE("The container \"%s\" is set up", name); |
cd54d859 | 3756 | |
0ad19a3f | 3757 | return 0; |
3758 | } | |
26ddeedd | 3759 | |
3f60c2f7 | 3760 | int run_lxc_hooks(const char *name, char *hookname, struct lxc_conf *conf, |
14a7b0f9 | 3761 | char *argv[]) |
26ddeedd | 3762 | { |
26ddeedd | 3763 | struct lxc_list *it; |
3ea957c6 RK |
3764 | int which; |
3765 | ||
3766 | for (which = 0; which < NUM_LXC_HOOKS; which ++) { | |
3767 | if (strcmp(hookname, lxchook_names[which]) == 0) | |
3768 | break; | |
3769 | } | |
3770 | ||
3771 | if (which >= NUM_LXC_HOOKS) | |
26ddeedd | 3772 | return -1; |
3f60c2f7 | 3773 | |
0fd73091 | 3774 | lxc_list_for_each (it, &conf->hooks[which]) { |
26ddeedd | 3775 | int ret; |
3f60c2f7 CB |
3776 | char *hook = it->elem; |
3777 | ||
3778 | ret = run_script_argv(name, conf->hooks_version, "lxc", hook, | |
14a7b0f9 | 3779 | hookname, argv); |
3f60c2f7 CB |
3780 | if (ret < 0) |
3781 | return -1; | |
26ddeedd | 3782 | } |
3f60c2f7 | 3783 | |
26ddeedd SH |
3784 | return 0; |
3785 | } | |
72d0e1cb | 3786 | |
72d0e1cb SG |
3787 | int lxc_clear_config_caps(struct lxc_conf *c) |
3788 | { | |
1a0e70ac | 3789 | struct lxc_list *it, *next; |
72d0e1cb | 3790 | |
0fd73091 | 3791 | lxc_list_for_each_safe (it, &c->caps, next) { |
72d0e1cb SG |
3792 | lxc_list_del(it); |
3793 | free(it->elem); | |
3794 | free(it); | |
3795 | } | |
0fd73091 | 3796 | |
72d0e1cb SG |
3797 | return 0; |
3798 | } | |
3799 | ||
c7e345ae CB |
3800 | static int lxc_free_idmap(struct lxc_list *id_map) |
3801 | { | |
27c27d73 SH |
3802 | struct lxc_list *it, *next; |
3803 | ||
0fd73091 | 3804 | lxc_list_for_each_safe (it, id_map, next) { |
27c27d73 SH |
3805 | lxc_list_del(it); |
3806 | free(it->elem); | |
3807 | free(it); | |
3808 | } | |
c7e345ae | 3809 | |
27c27d73 SH |
3810 | return 0; |
3811 | } | |
3812 | ||
4355ab5f SH |
3813 | int lxc_clear_idmaps(struct lxc_conf *c) |
3814 | { | |
3815 | return lxc_free_idmap(&c->id_map); | |
3816 | } | |
3817 | ||
1fb86a7c SH |
3818 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
3819 | { | |
0fd73091 | 3820 | struct lxc_list *it, *next; |
1fb86a7c | 3821 | |
0fd73091 | 3822 | lxc_list_for_each_safe (it, &c->keepcaps, next) { |
1fb86a7c SH |
3823 | lxc_list_del(it); |
3824 | free(it->elem); | |
3825 | free(it); | |
3826 | } | |
0fd73091 | 3827 | |
1fb86a7c SH |
3828 | return 0; |
3829 | } | |
3830 | ||
a3ed9b81 | 3831 | int lxc_clear_namespace(struct lxc_conf *c) |
3832 | { | |
3833 | int i; | |
3834 | for (i = 0; i < LXC_NS_MAX; i++) { | |
3835 | free(c->ns_share[i]); | |
3836 | c->ns_share[i] = NULL; | |
3837 | } | |
3838 | return 0; | |
3839 | } | |
3840 | ||
54860ed0 | 3841 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version) |
72d0e1cb | 3842 | { |
54860ed0 | 3843 | char *global_token, *namespaced_token; |
ab1a6cac | 3844 | size_t namespaced_token_len; |
54860ed0 | 3845 | struct lxc_list *it, *next, *list; |
ab1a6cac | 3846 | const char *k = key; |
54860ed0 | 3847 | bool all = false; |
72d0e1cb | 3848 | |
54860ed0 CB |
3849 | if (version == CGROUP2_SUPER_MAGIC) { |
3850 | global_token = "lxc.cgroup2"; | |
3851 | namespaced_token = "lxc.cgroup2."; | |
6333c915 | 3852 | namespaced_token_len = STRLITERALLEN("lxc.cgroup2."); |
54860ed0 CB |
3853 | list = &c->cgroup2; |
3854 | } else if (version == CGROUP_SUPER_MAGIC) { | |
3855 | global_token = "lxc.cgroup"; | |
3856 | namespaced_token = "lxc.cgroup."; | |
6333c915 | 3857 | namespaced_token_len = STRLITERALLEN("lxc.cgroup."); |
54860ed0 CB |
3858 | list = &c->cgroup; |
3859 | } else { | |
ab1a6cac | 3860 | return -EINVAL; |
54860ed0 CB |
3861 | } |
3862 | ||
3863 | if (strcmp(key, global_token) == 0) | |
72d0e1cb | 3864 | all = true; |
6333c915 | 3865 | else if (strncmp(key, namespaced_token, namespaced_token_len) == 0) |
ab1a6cac | 3866 | k += namespaced_token_len; |
a6390f01 | 3867 | else |
ab1a6cac | 3868 | return -EINVAL; |
72d0e1cb | 3869 | |
0fd73091 | 3870 | lxc_list_for_each_safe (it, list, next) { |
72d0e1cb | 3871 | struct lxc_cgroup *cg = it->elem; |
54860ed0 | 3872 | |
72d0e1cb SG |
3873 | if (!all && strcmp(cg->subsystem, k) != 0) |
3874 | continue; | |
54860ed0 | 3875 | |
72d0e1cb SG |
3876 | lxc_list_del(it); |
3877 | free(cg->subsystem); | |
3878 | free(cg->value); | |
3879 | free(cg); | |
3880 | free(it); | |
3881 | } | |
e409b214 | 3882 | |
72d0e1cb SG |
3883 | return 0; |
3884 | } | |
3885 | ||
4bfb655e CB |
3886 | static void lxc_clear_devices(struct lxc_conf *conf) |
3887 | { | |
3888 | struct lxc_list *list = &conf->devices; | |
3889 | struct lxc_list *it, *next; | |
3890 | ||
3891 | lxc_list_for_each_safe(it, list, next) { | |
3892 | lxc_list_del(it); | |
3893 | free(it); | |
3894 | } | |
3895 | } | |
3896 | ||
c6d09e15 WB |
3897 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
3898 | { | |
3899 | struct lxc_list *it, *next; | |
c6d09e15 | 3900 | const char *k = NULL; |
0fd73091 | 3901 | bool all = false; |
c6d09e15 | 3902 | |
b668653c | 3903 | if (strcmp(key, "lxc.limit") == 0 || strcmp(key, "lxc.prlimit") == 0) |
c6d09e15 | 3904 | all = true; |
6333c915 CB |
3905 | else if (strncmp(key, "lxc.limit.", STRLITERALLEN("lxc.limit.")) == 0) |
3906 | k = key + STRLITERALLEN("lxc.limit."); | |
3907 | else if (strncmp(key, "lxc.prlimit.", STRLITERALLEN("lxc.prlimit.")) == 0) | |
3908 | k = key + STRLITERALLEN("lxc.prlimit."); | |
c6d09e15 WB |
3909 | else |
3910 | return -1; | |
3911 | ||
0fd73091 | 3912 | lxc_list_for_each_safe (it, &c->limits, next) { |
c6d09e15 | 3913 | struct lxc_limit *lim = it->elem; |
0fd73091 | 3914 | |
c6d09e15 WB |
3915 | if (!all && strcmp(lim->resource, k) != 0) |
3916 | continue; | |
0fd73091 | 3917 | |
c6d09e15 WB |
3918 | lxc_list_del(it); |
3919 | free(lim->resource); | |
3920 | free(lim); | |
3921 | free(it); | |
3922 | } | |
b668653c | 3923 | |
c6d09e15 WB |
3924 | return 0; |
3925 | } | |
3926 | ||
7edd0540 L |
3927 | int lxc_clear_sysctls(struct lxc_conf *c, const char *key) |
3928 | { | |
3929 | struct lxc_list *it, *next; | |
7edd0540 | 3930 | const char *k = NULL; |
0fd73091 | 3931 | bool all = false; |
7edd0540 L |
3932 | |
3933 | if (strcmp(key, "lxc.sysctl") == 0) | |
3934 | all = true; | |
6333c915 CB |
3935 | else if (strncmp(key, "lxc.sysctl.", STRLITERALLEN("lxc.sysctl.")) == 0) |
3936 | k = key + STRLITERALLEN("lxc.sysctl."); | |
7edd0540 L |
3937 | else |
3938 | return -1; | |
3939 | ||
0fd73091 | 3940 | lxc_list_for_each_safe (it, &c->sysctls, next) { |
7edd0540 | 3941 | struct lxc_sysctl *elem = it->elem; |
0fd73091 | 3942 | |
7edd0540 L |
3943 | if (!all && strcmp(elem->key, k) != 0) |
3944 | continue; | |
0fd73091 | 3945 | |
7edd0540 L |
3946 | lxc_list_del(it); |
3947 | free(elem->key); | |
3948 | free(elem->value); | |
3949 | free(elem); | |
3950 | free(it); | |
3951 | } | |
0fd73091 | 3952 | |
7edd0540 L |
3953 | return 0; |
3954 | } | |
3955 | ||
61d7a733 YT |
3956 | int lxc_clear_procs(struct lxc_conf *c, const char *key) |
3957 | { | |
0fd73091 | 3958 | struct lxc_list *it, *next; |
61d7a733 | 3959 | const char *k = NULL; |
0fd73091 | 3960 | bool all = false; |
61d7a733 YT |
3961 | |
3962 | if (strcmp(key, "lxc.proc") == 0) | |
3963 | all = true; | |
6333c915 CB |
3964 | else if (strncmp(key, "lxc.proc.", STRLITERALLEN("lxc.proc.")) == 0) |
3965 | k = key + STRLITERALLEN("lxc.proc."); | |
61d7a733 YT |
3966 | else |
3967 | return -1; | |
3968 | ||
0fd73091 | 3969 | lxc_list_for_each_safe (it, &c->procs, next) { |
61d7a733 | 3970 | struct lxc_proc *proc = it->elem; |
0fd73091 | 3971 | |
61d7a733 YT |
3972 | if (!all && strcmp(proc->filename, k) != 0) |
3973 | continue; | |
0fd73091 | 3974 | |
61d7a733 YT |
3975 | lxc_list_del(it); |
3976 | free(proc->filename); | |
3977 | free(proc->value); | |
3978 | free(proc); | |
3979 | free(it); | |
3980 | } | |
3981 | ||
3982 | return 0; | |
3983 | } | |
3984 | ||
ee1e7aa0 SG |
3985 | int lxc_clear_groups(struct lxc_conf *c) |
3986 | { | |
0fd73091 | 3987 | struct lxc_list *it, *next; |
ee1e7aa0 | 3988 | |
0fd73091 | 3989 | lxc_list_for_each_safe (it, &c->groups, next) { |
ee1e7aa0 SG |
3990 | lxc_list_del(it); |
3991 | free(it->elem); | |
3992 | free(it); | |
3993 | } | |
0fd73091 | 3994 | |
ee1e7aa0 SG |
3995 | return 0; |
3996 | } | |
3997 | ||
ab799c0b SG |
3998 | int lxc_clear_environment(struct lxc_conf *c) |
3999 | { | |
0fd73091 | 4000 | struct lxc_list *it, *next; |
ab799c0b | 4001 | |
0fd73091 | 4002 | lxc_list_for_each_safe (it, &c->environment, next) { |
ab799c0b SG |
4003 | lxc_list_del(it); |
4004 | free(it->elem); | |
4005 | free(it); | |
4006 | } | |
0fd73091 | 4007 | |
ab799c0b SG |
4008 | return 0; |
4009 | } | |
4010 | ||
72d0e1cb SG |
4011 | int lxc_clear_mount_entries(struct lxc_conf *c) |
4012 | { | |
0fd73091 | 4013 | struct lxc_list *it, *next; |
72d0e1cb | 4014 | |
0fd73091 | 4015 | lxc_list_for_each_safe (it, &c->mount_list, next) { |
72d0e1cb SG |
4016 | lxc_list_del(it); |
4017 | free(it->elem); | |
4018 | free(it); | |
4019 | } | |
0fd73091 | 4020 | |
72d0e1cb SG |
4021 | return 0; |
4022 | } | |
4023 | ||
b099e9e9 SH |
4024 | int lxc_clear_automounts(struct lxc_conf *c) |
4025 | { | |
4026 | c->auto_mounts = 0; | |
4027 | return 0; | |
4028 | } | |
4029 | ||
12a50cc6 | 4030 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 4031 | { |
72d0e1cb | 4032 | int i; |
0fd73091 CB |
4033 | struct lxc_list *it, *next; |
4034 | const char *k = NULL; | |
4035 | bool all = false, done = false; | |
72d0e1cb | 4036 | |
17ed13a3 SH |
4037 | if (strcmp(key, "lxc.hook") == 0) |
4038 | all = true; | |
6333c915 CB |
4039 | else if (strncmp(key, "lxc.hook.", STRLITERALLEN("lxc.hook.")) == 0) |
4040 | k = key + STRLITERALLEN("lxc.hook."); | |
a6390f01 WB |
4041 | else |
4042 | return -1; | |
17ed13a3 | 4043 | |
0fd73091 | 4044 | for (i = 0; i < NUM_LXC_HOOKS; i++) { |
17ed13a3 | 4045 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
0fd73091 | 4046 | lxc_list_for_each_safe (it, &c->hooks[i], next) { |
17ed13a3 SH |
4047 | lxc_list_del(it); |
4048 | free(it->elem); | |
4049 | free(it); | |
4050 | } | |
0fd73091 | 4051 | |
17ed13a3 | 4052 | done = true; |
72d0e1cb SG |
4053 | } |
4054 | } | |
17ed13a3 SH |
4055 | |
4056 | if (!done) { | |
4057 | ERROR("Invalid hook key: %s", key); | |
4058 | return -1; | |
4059 | } | |
0fd73091 | 4060 | |
72d0e1cb SG |
4061 | return 0; |
4062 | } | |
8eb5694b | 4063 | |
4184c3e1 SH |
4064 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
4065 | { | |
0fd73091 | 4066 | struct lxc_list *it, *next; |
4184c3e1 | 4067 | |
0fd73091 | 4068 | lxc_list_for_each_safe (it, &conf->aliens, next) { |
4184c3e1 SH |
4069 | lxc_list_del(it); |
4070 | free(it->elem); | |
4071 | free(it); | |
4072 | } | |
4073 | } | |
4074 | ||
c7b15d1e | 4075 | void lxc_clear_includes(struct lxc_conf *conf) |
f979ac15 | 4076 | { |
0fd73091 | 4077 | struct lxc_list *it, *next; |
f979ac15 | 4078 | |
0fd73091 | 4079 | lxc_list_for_each_safe (it, &conf->includes, next) { |
f979ac15 SH |
4080 | lxc_list_del(it); |
4081 | free(it->elem); | |
4082 | free(it); | |
4083 | } | |
4084 | } | |
4085 | ||
1800f924 WB |
4086 | int lxc_clear_apparmor_raw(struct lxc_conf *c) |
4087 | { | |
4088 | struct lxc_list *it, *next; | |
4089 | ||
4090 | lxc_list_for_each_safe (it, &c->lsm_aa_raw, next) { | |
4091 | lxc_list_del(it); | |
4092 | free(it->elem); | |
4093 | free(it); | |
4094 | } | |
4095 | ||
4096 | return 0; | |
4097 | } | |
4098 | ||
8eb5694b SH |
4099 | void lxc_conf_free(struct lxc_conf *conf) |
4100 | { | |
4101 | if (!conf) | |
4102 | return; | |
0fd73091 | 4103 | |
858377e4 SH |
4104 | if (current_config == conf) |
4105 | current_config = NULL; | |
aed105d5 | 4106 | lxc_terminal_conf_free(&conf->console); |
f10fad2f | 4107 | free(conf->rootfs.mount); |
b3b8c97f | 4108 | free(conf->rootfs.bdev_type); |
f10fad2f ME |
4109 | free(conf->rootfs.options); |
4110 | free(conf->rootfs.path); | |
9dd75981 | 4111 | free(conf->rootfs.data); |
f10fad2f | 4112 | free(conf->logfile); |
858377e4 SH |
4113 | if (conf->logfd != -1) |
4114 | close(conf->logfd); | |
f10fad2f | 4115 | free(conf->utsname); |
885766f5 CB |
4116 | free(conf->ttys.dir); |
4117 | free(conf->ttys.tty_names); | |
f10fad2f ME |
4118 | free(conf->fstab); |
4119 | free(conf->rcfile); | |
5cda27c1 | 4120 | free(conf->execute_cmd); |
f10fad2f | 4121 | free(conf->init_cmd); |
3c491553 | 4122 | free(conf->init_cwd); |
6b0d5538 | 4123 | free(conf->unexpanded_config); |
76d0127f | 4124 | free(conf->syslog); |
c302b476 | 4125 | lxc_free_networks(&conf->network); |
f10fad2f | 4126 | free(conf->lsm_aa_profile); |
1800f924 | 4127 | free(conf->lsm_aa_profile_computed); |
f10fad2f | 4128 | free(conf->lsm_se_context); |
c3e3c21a | 4129 | lxc_seccomp_free(&conf->seccomp); |
8eb5694b | 4130 | lxc_clear_config_caps(conf); |
1fb86a7c | 4131 | lxc_clear_config_keepcaps(conf); |
54860ed0 CB |
4132 | lxc_clear_cgroups(conf, "lxc.cgroup", CGROUP_SUPER_MAGIC); |
4133 | lxc_clear_cgroups(conf, "lxc.cgroup2", CGROUP2_SUPER_MAGIC); | |
4bfb655e | 4134 | lxc_clear_devices(conf); |
bf651989 | 4135 | lxc_clear_cgroup2_devices(conf); |
17ed13a3 | 4136 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 4137 | lxc_clear_mount_entries(conf); |
27c27d73 | 4138 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 4139 | lxc_clear_groups(conf); |
f979ac15 | 4140 | lxc_clear_includes(conf); |
761d81ca | 4141 | lxc_clear_aliens(conf); |
ab799c0b | 4142 | lxc_clear_environment(conf); |
240d4b74 | 4143 | lxc_clear_limits(conf, "lxc.prlimit"); |
7edd0540 | 4144 | lxc_clear_sysctls(conf, "lxc.sysctl"); |
61d7a733 | 4145 | lxc_clear_procs(conf, "lxc.proc"); |
1800f924 | 4146 | lxc_clear_apparmor_raw(conf); |
a3ed9b81 | 4147 | lxc_clear_namespace(conf); |
43654d34 CB |
4148 | free(conf->cgroup_meta.dir); |
4149 | free(conf->cgroup_meta.controllers); | |
7a41e857 LT |
4150 | free(conf->shmount.path_host); |
4151 | free(conf->shmount.path_cont); | |
8eb5694b SH |
4152 | free(conf); |
4153 | } | |
4355ab5f SH |
4154 | |
4155 | struct userns_fn_data { | |
4156 | int (*fn)(void *); | |
c9b7c33e | 4157 | const char *fn_name; |
4355ab5f SH |
4158 | void *arg; |
4159 | int p[2]; | |
4160 | }; | |
4161 | ||
4162 | static int run_userns_fn(void *data) | |
4163 | { | |
adaffdd7 | 4164 | int ret; |
4355ab5f | 4165 | char c; |
0fd73091 | 4166 | struct userns_fn_data *d = data; |
4355ab5f | 4167 | |
f8aa4bf3 | 4168 | /* Close write end of the pipe. */ |
4355ab5f | 4169 | close(d->p[1]); |
f8aa4bf3 CB |
4170 | |
4171 | /* Wait for parent to finish establishing a new mapping in the user | |
4172 | * namespace we are executing in. | |
4173 | */ | |
adaffdd7 | 4174 | ret = lxc_read_nointr(d->p[0], &c, 1); |
f8aa4bf3 | 4175 | /* Close read end of the pipe. */ |
4355ab5f | 4176 | close(d->p[0]); |
adaffdd7 CB |
4177 | if (ret != 1) |
4178 | return -1; | |
f8aa4bf3 | 4179 | |
c9b7c33e | 4180 | if (d->fn_name) |
adaffdd7 | 4181 | TRACE("Calling function \"%s\"", d->fn_name); |
0fd73091 | 4182 | |
f8aa4bf3 | 4183 | /* Call function to run. */ |
4355ab5f SH |
4184 | return d->fn(d->arg); |
4185 | } | |
4186 | ||
db7cfe23 CB |
4187 | static struct id_map *mapped_nsid_add(struct lxc_conf *conf, unsigned id, |
4188 | enum idtype idtype) | |
4189 | { | |
5173b710 CB |
4190 | const struct id_map *map; |
4191 | struct id_map *retmap; | |
db7cfe23 CB |
4192 | |
4193 | map = find_mapped_nsid_entry(conf, id, idtype); | |
4194 | if (!map) | |
4195 | return NULL; | |
4196 | ||
4197 | retmap = malloc(sizeof(*retmap)); | |
4198 | if (!retmap) | |
4199 | return NULL; | |
4200 | ||
4201 | memcpy(retmap, map, sizeof(*retmap)); | |
4202 | return retmap; | |
4203 | } | |
4204 | ||
c4333195 CB |
4205 | static struct id_map *find_mapped_hostid_entry(struct lxc_conf *conf, |
4206 | unsigned id, enum idtype idtype) | |
f8aa4bf3 | 4207 | { |
f8aa4bf3 | 4208 | struct id_map *map; |
0fd73091 | 4209 | struct lxc_list *it; |
f8aa4bf3 CB |
4210 | struct id_map *retmap = NULL; |
4211 | ||
0fd73091 | 4212 | lxc_list_for_each (it, &conf->id_map) { |
f8aa4bf3 CB |
4213 | map = it->elem; |
4214 | if (map->idtype != idtype) | |
4215 | continue; | |
4216 | ||
4217 | if (id >= map->hostid && id < map->hostid + map->range) { | |
4218 | retmap = map; | |
4219 | break; | |
4220 | } | |
4221 | } | |
4222 | ||
f8aa4bf3 CB |
4223 | return retmap; |
4224 | } | |
4225 | ||
0fd73091 | 4226 | /* Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
f8aa4bf3 | 4227 | * existing one or establish a new one. |
4355ab5f | 4228 | */ |
0fd73091 CB |
4229 | static struct id_map *mapped_hostid_add(struct lxc_conf *conf, uid_t id, |
4230 | enum idtype type) | |
4355ab5f | 4231 | { |
28a2d9e7 | 4232 | int hostid_mapped; |
c4333195 CB |
4233 | struct id_map *entry = NULL, *tmp = NULL; |
4234 | ||
4235 | entry = malloc(sizeof(*entry)); | |
4236 | if (!entry) | |
4237 | return NULL; | |
f8aa4bf3 | 4238 | |
28a2d9e7 | 4239 | /* Reuse existing mapping. */ |
c4333195 CB |
4240 | tmp = find_mapped_hostid_entry(conf, id, type); |
4241 | if (tmp) | |
4242 | return memcpy(entry, tmp, sizeof(*entry)); | |
f8aa4bf3 | 4243 | |
28a2d9e7 CB |
4244 | /* Find new mapping. */ |
4245 | hostid_mapped = find_unmapped_nsid(conf, type); | |
4246 | if (hostid_mapped < 0) { | |
c4333195 CB |
4247 | DEBUG("Failed to find free mapping for id %d", id); |
4248 | free(entry); | |
28a2d9e7 | 4249 | return NULL; |
f8aa4bf3 | 4250 | } |
f8aa4bf3 | 4251 | |
28a2d9e7 CB |
4252 | entry->idtype = type; |
4253 | entry->nsid = hostid_mapped; | |
4254 | entry->hostid = (unsigned long)id; | |
4255 | entry->range = 1; | |
4355ab5f | 4256 | |
28a2d9e7 | 4257 | return entry; |
4355ab5f SH |
4258 | } |
4259 | ||
dcf0ffdf | 4260 | struct lxc_list *get_minimal_idmap(struct lxc_conf *conf) |
4355ab5f | 4261 | { |
00d6cfe2 CB |
4262 | __do_free struct id_map *container_root_uid = NULL, |
4263 | *container_root_gid = NULL, | |
4264 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4265 | __do_free struct lxc_list *idmap = NULL; | |
f8aa4bf3 | 4266 | uid_t euid, egid; |
4160c3a0 CB |
4267 | uid_t nsuid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; |
4268 | gid_t nsgid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
00d6cfe2 | 4269 | struct lxc_list *tmplist = NULL; |
4355ab5f | 4270 | |
db7cfe23 | 4271 | /* Find container root mappings. */ |
4160c3a0 | 4272 | container_root_uid = mapped_nsid_add(conf, nsuid, ID_TYPE_UID); |
db7cfe23 | 4273 | if (!container_root_uid) { |
dcf0ffdf | 4274 | DEBUG("Failed to find mapping for namespace uid %d", 0); |
00d6cfe2 | 4275 | return NULL; |
f8aa4bf3 | 4276 | } |
dcf0ffdf CB |
4277 | euid = geteuid(); |
4278 | if (euid >= container_root_uid->hostid && | |
4279 | euid < (container_root_uid->hostid + container_root_uid->range)) | |
db7cfe23 | 4280 | host_uid_map = container_root_uid; |
f8aa4bf3 | 4281 | |
4160c3a0 | 4282 | container_root_gid = mapped_nsid_add(conf, nsgid, ID_TYPE_GID); |
db7cfe23 | 4283 | if (!container_root_gid) { |
dcf0ffdf | 4284 | DEBUG("Failed to find mapping for namespace gid %d", 0); |
00d6cfe2 | 4285 | return NULL; |
f8aa4bf3 | 4286 | } |
dcf0ffdf CB |
4287 | egid = getegid(); |
4288 | if (egid >= container_root_gid->hostid && | |
4289 | egid < (container_root_gid->hostid + container_root_gid->range)) | |
db7cfe23 | 4290 | host_gid_map = container_root_gid; |
f8aa4bf3 CB |
4291 | |
4292 | /* Check whether the {g,u}id of the user has a mapping. */ | |
954b7d9b | 4293 | if (!host_uid_map) |
c4333195 | 4294 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
28a2d9e7 | 4295 | if (!host_uid_map) { |
db7cfe23 | 4296 | DEBUG("Failed to find mapping for uid %d", euid); |
00d6cfe2 | 4297 | return NULL; |
f8aa4bf3 CB |
4298 | } |
4299 | ||
dcf0ffdf CB |
4300 | if (!host_gid_map) |
4301 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); | |
28a2d9e7 | 4302 | if (!host_gid_map) { |
db7cfe23 | 4303 | DEBUG("Failed to find mapping for gid %d", egid); |
00d6cfe2 | 4304 | return NULL; |
28a2d9e7 CB |
4305 | } |
4306 | ||
4307 | /* Allocate new {g,u}id map list. */ | |
4308 | idmap = malloc(sizeof(*idmap)); | |
4309 | if (!idmap) | |
00d6cfe2 | 4310 | return NULL; |
28a2d9e7 CB |
4311 | lxc_list_init(idmap); |
4312 | ||
f8aa4bf3 CB |
4313 | /* Add container root to the map. */ |
4314 | tmplist = malloc(sizeof(*tmplist)); | |
4315 | if (!tmplist) | |
00d6cfe2 | 4316 | return NULL; |
f8aa4bf3 CB |
4317 | lxc_list_add_elem(tmplist, container_root_uid); |
4318 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4319 | |
1d90e064 | 4320 | if (host_uid_map && (host_uid_map != container_root_uid)) { |
28a2d9e7 | 4321 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4322 | move_ptr(container_root_uid); |
28a2d9e7 CB |
4323 | |
4324 | /* Add container root to the map. */ | |
4325 | tmplist = malloc(sizeof(*tmplist)); | |
4326 | if (!tmplist) | |
00d6cfe2 | 4327 | return NULL; |
28a2d9e7 CB |
4328 | lxc_list_add_elem(tmplist, host_uid_map); |
4329 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4330 | } |
1d90e064 | 4331 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4332 | move_ptr(container_root_uid); |
1d90e064 | 4333 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4334 | move_ptr(host_uid_map); |
f8aa4bf3 CB |
4335 | |
4336 | tmplist = malloc(sizeof(*tmplist)); | |
4337 | if (!tmplist) | |
00d6cfe2 | 4338 | return NULL; |
f8aa4bf3 CB |
4339 | lxc_list_add_elem(tmplist, container_root_gid); |
4340 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4341 | |
1d90e064 | 4342 | if (host_gid_map && (host_gid_map != container_root_gid)) { |
28a2d9e7 | 4343 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4344 | move_ptr(container_root_gid); |
28a2d9e7 CB |
4345 | |
4346 | tmplist = malloc(sizeof(*tmplist)); | |
4347 | if (!tmplist) | |
00d6cfe2 | 4348 | return NULL; |
28a2d9e7 CB |
4349 | lxc_list_add_elem(tmplist, host_gid_map); |
4350 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4351 | } |
1d90e064 | 4352 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4353 | move_ptr(container_root_gid); |
1d90e064 | 4354 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4355 | move_ptr(host_gid_map); |
f8aa4bf3 | 4356 | |
dcf0ffdf | 4357 | TRACE("Allocated minimal idmapping"); |
00d6cfe2 | 4358 | return move_ptr(idmap); |
dcf0ffdf CB |
4359 | } |
4360 | ||
4361 | /* Run a function in a new user namespace. | |
4362 | * The caller's euid/egid will be mapped if it is not already. | |
4363 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
4364 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
4365 | * This means we require only to establish a mapping from: | |
4366 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
4367 | * - the container root -> some sub{g,u}id | |
915e3dbd | 4368 | * The former we add, if the user did not specify a mapping. The latter we |
6f3fd27f | 4369 | * retrieve from the container's configured {g,u}id mappings as it must have been |
dcf0ffdf CB |
4370 | * there to start the container in the first place. |
4371 | */ | |
4372 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data, | |
4373 | const char *fn_name) | |
4374 | { | |
4375 | pid_t pid; | |
dcf0ffdf | 4376 | int p[2]; |
0fd73091 | 4377 | struct userns_fn_data d; |
dcf0ffdf | 4378 | struct lxc_list *idmap; |
0fd73091 CB |
4379 | int ret = -1, status = -1; |
4380 | char c = '1'; | |
dcf0ffdf | 4381 | |
2b2655a8 CB |
4382 | if (!conf) |
4383 | return -EINVAL; | |
4384 | ||
dcf0ffdf CB |
4385 | idmap = get_minimal_idmap(conf); |
4386 | if (!idmap) | |
4387 | return -1; | |
4388 | ||
979f9e34 | 4389 | ret = pipe2(p, O_CLOEXEC); |
dcf0ffdf CB |
4390 | if (ret < 0) { |
4391 | SYSERROR("Failed to create pipe"); | |
4392 | return -1; | |
4393 | } | |
4394 | d.fn = fn; | |
4395 | d.fn_name = fn_name; | |
4396 | d.arg = data; | |
4397 | d.p[0] = p[0]; | |
4398 | d.p[1] = p[1]; | |
4399 | ||
4400 | /* Clone child in new user namespace. */ | |
a59440be | 4401 | pid = lxc_raw_clone_cb(run_userns_fn, &d, CLONE_NEWUSER, NULL); |
dcf0ffdf | 4402 | if (pid < 0) { |
0fd73091 | 4403 | ERROR("Failed to clone process in new user namespace"); |
dcf0ffdf CB |
4404 | goto on_error; |
4405 | } | |
4406 | ||
4407 | close(p[0]); | |
4408 | p[0] = -1; | |
4409 | ||
4b73005c CB |
4410 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || |
4411 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
dcf0ffdf | 4412 | struct id_map *map; |
0fd73091 | 4413 | struct lxc_list *it; |
dcf0ffdf | 4414 | |
0fd73091 | 4415 | lxc_list_for_each (it, idmap) { |
f8aa4bf3 | 4416 | map = it->elem; |
dcf0ffdf | 4417 | TRACE("Establishing %cid mapping for \"%d\" in new " |
f8aa4bf3 | 4418 | "user namespace: nsuid %lu - hostid %lu - range " |
0fd73091 CB |
4419 | "%lu", |
4420 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4421 | map->nsid, map->hostid, map->range); | |
f8aa4bf3 | 4422 | } |
4355ab5f SH |
4423 | } |
4424 | ||
f8aa4bf3 | 4425 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 4426 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 | 4427 | if (ret < 0) { |
0fd73091 | 4428 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); |
f8aa4bf3 | 4429 | goto on_error; |
4355ab5f SH |
4430 | } |
4431 | ||
f8aa4bf3 | 4432 | /* Tell child to proceed. */ |
489f39be | 4433 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
dcf0ffdf | 4434 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
f8aa4bf3 | 4435 | goto on_error; |
4355ab5f SH |
4436 | } |
4437 | ||
686dd5d1 | 4438 | on_error: |
4355ab5f SH |
4439 | if (p[0] != -1) |
4440 | close(p[0]); | |
4441 | close(p[1]); | |
f8aa4bf3 | 4442 | |
ee1b16bc TA |
4443 | /* Wait for child to finish. */ |
4444 | if (pid > 0) | |
4445 | status = wait_for_pid(pid); | |
4446 | ||
686dd5d1 CB |
4447 | if (status < 0) |
4448 | ret = -1; | |
4449 | ||
f8aa4bf3 | 4450 | return ret; |
4355ab5f | 4451 | } |
97e9cfa0 | 4452 | |
415a8851 CB |
4453 | int userns_exec_full(struct lxc_conf *conf, int (*fn)(void *), void *data, |
4454 | const char *fn_name) | |
4455 | { | |
4456 | pid_t pid; | |
4457 | uid_t euid, egid; | |
415a8851 CB |
4458 | int p[2]; |
4459 | struct id_map *map; | |
4460 | struct lxc_list *cur; | |
0fd73091 | 4461 | struct userns_fn_data d; |
415a8851 | 4462 | int ret = -1; |
0fd73091 | 4463 | char c = '1'; |
415a8851 CB |
4464 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
4465 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, | |
4466 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4467 | ||
2b2655a8 CB |
4468 | if (!conf) |
4469 | return -EINVAL; | |
4470 | ||
979f9e34 | 4471 | ret = pipe2(p, O_CLOEXEC); |
415a8851 CB |
4472 | if (ret < 0) { |
4473 | SYSERROR("opening pipe"); | |
4474 | return -1; | |
4475 | } | |
4476 | d.fn = fn; | |
4477 | d.fn_name = fn_name; | |
4478 | d.arg = data; | |
4479 | d.p[0] = p[0]; | |
4480 | d.p[1] = p[1]; | |
4481 | ||
4482 | /* Clone child in new user namespace. */ | |
33258b95 | 4483 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER, NULL); |
415a8851 | 4484 | if (pid < 0) { |
0fd73091 | 4485 | ERROR("Failed to clone process in new user namespace"); |
415a8851 CB |
4486 | goto on_error; |
4487 | } | |
4488 | ||
4489 | close(p[0]); | |
4490 | p[0] = -1; | |
4491 | ||
4492 | euid = geteuid(); | |
4493 | egid = getegid(); | |
4494 | ||
4495 | /* Allocate new {g,u}id map list. */ | |
4496 | idmap = malloc(sizeof(*idmap)); | |
4497 | if (!idmap) | |
4498 | goto on_error; | |
4499 | lxc_list_init(idmap); | |
4500 | ||
4501 | /* Find container root. */ | |
0fd73091 | 4502 | lxc_list_for_each (cur, &conf->id_map) { |
415a8851 CB |
4503 | struct id_map *tmpmap; |
4504 | ||
4505 | tmplist = malloc(sizeof(*tmplist)); | |
4506 | if (!tmplist) | |
4507 | goto on_error; | |
4508 | ||
4509 | tmpmap = malloc(sizeof(*tmpmap)); | |
4510 | if (!tmpmap) { | |
4511 | free(tmplist); | |
4512 | goto on_error; | |
4513 | } | |
4514 | ||
4515 | memset(tmpmap, 0, sizeof(*tmpmap)); | |
4516 | memcpy(tmpmap, cur->elem, sizeof(*tmpmap)); | |
4517 | tmplist->elem = tmpmap; | |
4518 | ||
4519 | lxc_list_add_tail(idmap, tmplist); | |
4520 | ||
4521 | map = cur->elem; | |
4522 | ||
4523 | if (map->idtype == ID_TYPE_UID) | |
4524 | if (euid >= map->hostid && euid < map->hostid + map->range) | |
4525 | host_uid_map = map; | |
4526 | ||
4527 | if (map->idtype == ID_TYPE_GID) | |
4528 | if (egid >= map->hostid && egid < map->hostid + map->range) | |
4529 | host_gid_map = map; | |
4530 | ||
4531 | if (map->nsid != 0) | |
4532 | continue; | |
4533 | ||
4534 | if (map->idtype == ID_TYPE_UID) | |
4535 | if (container_root_uid == NULL) | |
4536 | container_root_uid = map; | |
4537 | ||
4538 | if (map->idtype == ID_TYPE_GID) | |
4539 | if (container_root_gid == NULL) | |
4540 | container_root_gid = map; | |
4541 | } | |
4542 | ||
4543 | if (!container_root_uid || !container_root_gid) { | |
4544 | ERROR("No mapping for container root found"); | |
4545 | goto on_error; | |
4546 | } | |
4547 | ||
4548 | /* Check whether the {g,u}id of the user has a mapping. */ | |
4549 | if (!host_uid_map) | |
c4333195 | 4550 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
415a8851 CB |
4551 | else |
4552 | host_uid_map = container_root_uid; | |
4553 | ||
4554 | if (!host_gid_map) | |
c4333195 | 4555 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); |
415a8851 CB |
4556 | else |
4557 | host_gid_map = container_root_gid; | |
4558 | ||
4559 | if (!host_uid_map) { | |
4560 | DEBUG("Failed to find mapping for uid %d", euid); | |
4561 | goto on_error; | |
4562 | } | |
4563 | ||
4564 | if (!host_gid_map) { | |
4565 | DEBUG("Failed to find mapping for gid %d", egid); | |
4566 | goto on_error; | |
4567 | } | |
4568 | ||
4569 | if (host_uid_map && (host_uid_map != container_root_uid)) { | |
4570 | /* Add container root to the map. */ | |
4571 | tmplist = malloc(sizeof(*tmplist)); | |
4572 | if (!tmplist) | |
4573 | goto on_error; | |
4574 | lxc_list_add_elem(tmplist, host_uid_map); | |
4575 | lxc_list_add_tail(idmap, tmplist); | |
4576 | } | |
4577 | /* idmap will now keep track of that memory. */ | |
4578 | host_uid_map = NULL; | |
4579 | ||
4580 | if (host_gid_map && (host_gid_map != container_root_gid)) { | |
4581 | tmplist = malloc(sizeof(*tmplist)); | |
4582 | if (!tmplist) | |
4583 | goto on_error; | |
4584 | lxc_list_add_elem(tmplist, host_gid_map); | |
4585 | lxc_list_add_tail(idmap, tmplist); | |
4586 | } | |
4587 | /* idmap will now keep track of that memory. */ | |
4588 | host_gid_map = NULL; | |
4589 | ||
4590 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || | |
4591 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
0fd73091 | 4592 | lxc_list_for_each (cur, idmap) { |
415a8851 CB |
4593 | map = cur->elem; |
4594 | TRACE("establishing %cid mapping for \"%d\" in new " | |
4595 | "user namespace: nsuid %lu - hostid %lu - range " | |
4596 | "%lu", | |
4597 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4598 | map->nsid, map->hostid, map->range); | |
4599 | } | |
4600 | } | |
4601 | ||
4602 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
4603 | ret = lxc_map_ids(idmap, pid); | |
4604 | if (ret < 0) { | |
0fd73091 | 4605 | ERROR("error setting up {g,u}id mappings for child process \"%d\"", pid); |
415a8851 CB |
4606 | goto on_error; |
4607 | } | |
4608 | ||
4609 | /* Tell child to proceed. */ | |
489f39be | 4610 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
0fd73091 | 4611 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
415a8851 CB |
4612 | goto on_error; |
4613 | } | |
4614 | ||
686dd5d1 | 4615 | on_error: |
ee1b16bc TA |
4616 | if (p[0] != -1) |
4617 | close(p[0]); | |
4618 | close(p[1]); | |
4619 | ||
415a8851 | 4620 | /* Wait for child to finish. */ |
686dd5d1 CB |
4621 | if (pid > 0) |
4622 | ret = wait_for_pid(pid); | |
415a8851 | 4623 | |
80758b4b | 4624 | if (idmap) { |
415a8851 | 4625 | lxc_free_idmap(idmap); |
80758b4b DJ |
4626 | free(idmap); |
4627 | } | |
4628 | ||
415a8851 CB |
4629 | if (host_uid_map && (host_uid_map != container_root_uid)) |
4630 | free(host_uid_map); | |
4631 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4632 | free(host_gid_map); | |
4633 | ||
415a8851 CB |
4634 | return ret; |
4635 | } | |
4636 | ||
a96a8e8c | 4637 | /* not thread-safe, do not use from api without first forking */ |
0fd73091 | 4638 | static char *getuname(void) |
97e9cfa0 | 4639 | { |
4f410b2a | 4640 | __do_free char *buf = NULL; |
cb7aa5e8 DJ |
4641 | struct passwd pwent; |
4642 | struct passwd *pwentp = NULL; | |
cb7aa5e8 DJ |
4643 | size_t bufsize; |
4644 | int ret; | |
97e9cfa0 | 4645 | |
cb7aa5e8 DJ |
4646 | bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); |
4647 | if (bufsize == -1) | |
4648 | bufsize = 1024; | |
4649 | ||
4650 | buf = malloc(bufsize); | |
4651 | if (!buf) | |
97e9cfa0 SH |
4652 | return NULL; |
4653 | ||
cb7aa5e8 DJ |
4654 | ret = getpwuid_r(geteuid(), &pwent, buf, bufsize, &pwentp); |
4655 | if (!pwentp) { | |
4656 | if (ret == 0) | |
4657 | WARN("Could not find matched password record."); | |
4658 | ||
4659 | ERROR("Failed to get password record - %u", geteuid()); | |
cb7aa5e8 DJ |
4660 | return NULL; |
4661 | } | |
4662 | ||
4f410b2a | 4663 | return strdup(pwent.pw_name); |
97e9cfa0 SH |
4664 | } |
4665 | ||
a96a8e8c | 4666 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4667 | static char *getgname(void) |
4668 | { | |
4f410b2a | 4669 | __do_free char *buf = NULL; |
3de9fb4c DJ |
4670 | struct group grent; |
4671 | struct group *grentp = NULL; | |
3de9fb4c DJ |
4672 | size_t bufsize; |
4673 | int ret; | |
4674 | ||
4675 | bufsize = sysconf(_SC_GETGR_R_SIZE_MAX); | |
4676 | if (bufsize == -1) | |
4677 | bufsize = 1024; | |
4678 | ||
4679 | buf = malloc(bufsize); | |
4680 | if (!buf) | |
4681 | return NULL; | |
4682 | ||
4683 | ret = getgrgid_r(getegid(), &grent, buf, bufsize, &grentp); | |
4684 | if (!grentp) { | |
4685 | if (ret == 0) | |
4686 | WARN("Could not find matched group record"); | |
97e9cfa0 | 4687 | |
3de9fb4c | 4688 | ERROR("Failed to get group record - %u", getegid()); |
97e9cfa0 | 4689 | return NULL; |
3de9fb4c DJ |
4690 | } |
4691 | ||
4f410b2a | 4692 | return strdup(grent.gr_name); |
97e9cfa0 SH |
4693 | } |
4694 | ||
a96a8e8c | 4695 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4696 | void suggest_default_idmap(void) |
4697 | { | |
3a6e3bf5 | 4698 | __do_free char *gname = NULL, *line = NULL, *uname = NULL; |
4aae564f | 4699 | __do_fclose FILE *subuid_f = NULL, *subgid_f = NULL; |
97e9cfa0 | 4700 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; |
97e9cfa0 SH |
4701 | size_t len = 0; |
4702 | ||
0fd73091 CB |
4703 | uname = getuname(); |
4704 | if (!uname) | |
97e9cfa0 SH |
4705 | return; |
4706 | ||
0fd73091 | 4707 | gname = getgname(); |
3a6e3bf5 | 4708 | if (!gname) |
97e9cfa0 | 4709 | return; |
97e9cfa0 | 4710 | |
4110345b | 4711 | subuid_f = fopen(subuidfile, "re"); |
4aae564f | 4712 | if (!subuid_f) { |
97e9cfa0 | 4713 | ERROR("Your system is not configured with subuids"); |
97e9cfa0 SH |
4714 | return; |
4715 | } | |
0fd73091 | 4716 | |
4aae564f | 4717 | while (getline(&line, &len, subuid_f) != -1) { |
0fd73091 | 4718 | char *p, *p2; |
b7930180 | 4719 | size_t no_newline = 0; |
0fd73091 CB |
4720 | |
4721 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4722 | if (*line == '#') |
4723 | continue; | |
4724 | if (!p) | |
4725 | continue; | |
4726 | *p = '\0'; | |
4727 | p++; | |
0fd73091 | 4728 | |
97e9cfa0 SH |
4729 | if (strcmp(line, uname)) |
4730 | continue; | |
0fd73091 | 4731 | |
97e9cfa0 SH |
4732 | p2 = strchr(p, ':'); |
4733 | if (!p2) | |
4734 | continue; | |
4735 | *p2 = '\0'; | |
4736 | p2++; | |
4737 | if (!*p2) | |
4738 | continue; | |
b7930180 CB |
4739 | no_newline = strcspn(p2, "\n"); |
4740 | p2[no_newline] = '\0'; | |
4741 | ||
b7b2fde4 | 4742 | if (lxc_safe_uint(p, &uid) < 0) |
0fd73091 | 4743 | WARN("Could not parse UID"); |
b7b2fde4 | 4744 | if (lxc_safe_uint(p2, &urange) < 0) |
0fd73091 | 4745 | WARN("Could not parse UID range"); |
97e9cfa0 | 4746 | } |
97e9cfa0 | 4747 | |
4110345b | 4748 | subgid_f = fopen(subgidfile, "re"); |
4aae564f | 4749 | if (!subgid_f) { |
97e9cfa0 | 4750 | ERROR("Your system is not configured with subgids"); |
97e9cfa0 SH |
4751 | return; |
4752 | } | |
0fd73091 | 4753 | |
4aae564f | 4754 | while (getline(&line, &len, subgid_f) != -1) { |
0fd73091 | 4755 | char *p, *p2; |
b7930180 | 4756 | size_t no_newline = 0; |
0fd73091 CB |
4757 | |
4758 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4759 | if (*line == '#') |
4760 | continue; | |
4761 | if (!p) | |
4762 | continue; | |
4763 | *p = '\0'; | |
4764 | p++; | |
0fd73091 | 4765 | |
97e9cfa0 SH |
4766 | if (strcmp(line, uname)) |
4767 | continue; | |
0fd73091 | 4768 | |
97e9cfa0 SH |
4769 | p2 = strchr(p, ':'); |
4770 | if (!p2) | |
4771 | continue; | |
4772 | *p2 = '\0'; | |
4773 | p2++; | |
4774 | if (!*p2) | |
4775 | continue; | |
b7930180 CB |
4776 | no_newline = strcspn(p2, "\n"); |
4777 | p2[no_newline] = '\0'; | |
4778 | ||
b7b2fde4 | 4779 | if (lxc_safe_uint(p, &gid) < 0) |
0fd73091 | 4780 | WARN("Could not parse GID"); |
b7b2fde4 | 4781 | if (lxc_safe_uint(p2, &grange) < 0) |
0fd73091 | 4782 | WARN("Could not parse GID range"); |
97e9cfa0 | 4783 | } |
97e9cfa0 | 4784 | |
97e9cfa0 SH |
4785 | if (!urange || !grange) { |
4786 | ERROR("You do not have subuids or subgids allocated"); | |
4787 | ERROR("Unprivileged containers require subuids and subgids"); | |
4788 | return; | |
4789 | } | |
4790 | ||
4791 | ERROR("You must either run as root, or define uid mappings"); | |
4792 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4793 | ERROR("~/.config/lxc/default.conf:"); | |
4794 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
bdcbb6b3 CB |
4795 | ERROR("lxc.idmap = u 0 %u %u", uid, urange); |
4796 | ERROR("lxc.idmap = g 0 %u %u", gid, grange); | |
97e9cfa0 | 4797 | } |
aaf26830 | 4798 | |
a7307747 SH |
4799 | static void free_cgroup_settings(struct lxc_list *result) |
4800 | { | |
4801 | struct lxc_list *iterator, *next; | |
4802 | ||
0fd73091 | 4803 | lxc_list_for_each_safe (iterator, result, next) { |
a7307747 SH |
4804 | lxc_list_del(iterator); |
4805 | free(iterator); | |
4806 | } | |
4807 | free(result); | |
4808 | } | |
4809 | ||
0fd73091 | 4810 | /* Return the list of cgroup_settings sorted according to the following rules |
aaf26830 KT |
4811 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes |
4812 | */ | |
0fd73091 | 4813 | struct lxc_list *sort_cgroup_settings(struct lxc_list *cgroup_settings) |
aaf26830 KT |
4814 | { |
4815 | struct lxc_list *result; | |
aaf26830 | 4816 | struct lxc_cgroup *cg = NULL; |
0fd73091 | 4817 | struct lxc_list *it = NULL, *item = NULL, *memsw_limit = NULL; |
aaf26830 KT |
4818 | |
4819 | result = malloc(sizeof(*result)); | |
0fd73091 | 4820 | if (!result) |
fac7c663 | 4821 | return NULL; |
aaf26830 KT |
4822 | lxc_list_init(result); |
4823 | ||
0fd73091 CB |
4824 | /* Iterate over the cgroup settings and copy them to the output list. */ |
4825 | lxc_list_for_each (it, cgroup_settings) { | |
aaf26830 | 4826 | item = malloc(sizeof(*item)); |
fac7c663 | 4827 | if (!item) { |
a7307747 | 4828 | free_cgroup_settings(result); |
fac7c663 KT |
4829 | return NULL; |
4830 | } | |
0fd73091 | 4831 | |
aaf26830 KT |
4832 | item->elem = it->elem; |
4833 | cg = it->elem; | |
4834 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
4835 | /* Store the memsw_limit location */ | |
4836 | memsw_limit = item; | |
0fd73091 CB |
4837 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && |
4838 | memsw_limit != NULL) { | |
4839 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found | |
4840 | * before lxc.cgroup.memory.limit_in_bytes, swap these | |
4841 | * two items */ | |
aaf26830 KT |
4842 | item->elem = memsw_limit->elem; |
4843 | memsw_limit->elem = it->elem; | |
4844 | } | |
4845 | lxc_list_add_tail(result, item); | |
4846 | } | |
4847 | ||
4848 | return result; | |
a7307747 | 4849 | } |