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Commit | Line | Data |
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0ad19a3f | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
0ad19a3f | 8 | * |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
0ad19a3f | 22 | */ |
1d52bdf7 CB |
23 | |
24 | #define _GNU_SOURCE | |
d06245b8 NC |
25 | #include "config.h" |
26 | ||
9d257a2a | 27 | #include <arpa/inet.h> |
8f3e280e CB |
28 | #include <dirent.h> |
29 | #include <errno.h> | |
30 | #include <fcntl.h> | |
31 | #include <grp.h> | |
32 | #include <inttypes.h> | |
33 | #include <libgen.h> | |
9d257a2a CB |
34 | #include <linux/loop.h> |
35 | #include <net/if.h> | |
36 | #include <netinet/in.h> | |
8f3e280e CB |
37 | #include <pwd.h> |
38 | #include <stdarg.h> | |
0ad19a3f | 39 | #include <stdio.h> |
0ad19a3f | 40 | #include <stdlib.h> |
0ad19a3f | 41 | #include <string.h> |
8f3e280e CB |
42 | #include <sys/mman.h> |
43 | #include <sys/mount.h> | |
44 | #include <sys/param.h> | |
45 | #include <sys/prctl.h> | |
8f3e280e | 46 | #include <sys/socket.h> |
9d257a2a | 47 | #include <sys/stat.h> |
2d76d1d7 | 48 | #include <sys/syscall.h> |
9d257a2a | 49 | #include <sys/sysmacros.h> |
97e9cfa0 | 50 | #include <sys/types.h> |
8f3e280e CB |
51 | #include <sys/utsname.h> |
52 | #include <sys/wait.h> | |
9d257a2a CB |
53 | #include <time.h> |
54 | #include <unistd.h> | |
1d52bdf7 | 55 | |
af6824fc | 56 | #ifdef MAJOR_IN_MKDEV |
9d257a2a | 57 | #include <sys/mkdev.h> |
af6824fc | 58 | #endif |
af6824fc | 59 | |
614305f3 | 60 | #ifdef HAVE_STATVFS |
2938f7c8 | 61 | #include <sys/statvfs.h> |
614305f3 | 62 | #endif |
e827ff7e SG |
63 | |
64 | #if HAVE_PTY_H | |
b0a33c1e | 65 | #include <pty.h> |
e827ff7e SG |
66 | #else |
67 | #include <../include/openpty.h> | |
68 | #endif | |
0ad19a3f | 69 | |
9d257a2a CB |
70 | #if HAVE_LIBCAP |
71 | #include <sys/capability.h> | |
72 | #endif | |
73 | ||
74 | #if HAVE_SYS_PERSONALITY_H | |
75 | #include <sys/personality.h> | |
76 | #endif | |
77 | ||
78 | #if IS_BIONIC | |
79 | #include <../include/lxcmntent.h> | |
80 | #else | |
81 | #include <mntent.h> | |
82 | #endif | |
83 | ||
84 | #if !defined(HAVE_PRLIMIT) && defined(HAVE_PRLIMIT64) | |
85 | #include <../include/prlimit.h> | |
86 | #endif | |
87 | ||
e8bd4e43 | 88 | #include "af_unix.h" |
9d257a2a | 89 | #include "caps.h" |
8f3e280e | 90 | #include "cgroup.h" |
1b09f2c0 | 91 | #include "conf.h" |
1ed6ba91 | 92 | #include "confile_utils.h" |
8f3e280e | 93 | #include "error.h" |
1b09f2c0 | 94 | #include "log.h" |
0ed9b1bc | 95 | #include "lsm/lsm.h" |
025ed0f3 | 96 | #include "lxclock.h" |
8f3e280e | 97 | #include "lxcseccomp.h" |
4355ab5f | 98 | #include "namespace.h" |
8f3e280e CB |
99 | #include "network.h" |
100 | #include "parse.h" | |
732375f5 | 101 | #include "ringbuf.h" |
28d832c4 | 102 | #include "storage.h" |
28d832c4 | 103 | #include "storage/overlay.h" |
0ed9b1bc | 104 | #include "terminal.h" |
8f3e280e | 105 | #include "utils.h" |
d0a36f2c | 106 | |
9d257a2a CB |
107 | #ifndef MS_PRIVATE |
108 | #define MS_PRIVATE (1<<18) | |
edaf8b1b SG |
109 | #endif |
110 | ||
9d257a2a CB |
111 | #ifndef MS_LAZYTIME |
112 | #define MS_LAZYTIME (1<<25) | |
f48b5fd8 FF |
113 | #endif |
114 | ||
36eb9bde | 115 | lxc_log_define(lxc_conf, lxc); |
e5bda9ee | 116 | |
0fd73091 CB |
117 | /* The lxc_conf of the container currently being worked on in an API call. |
118 | * This is used in the error calls. | |
119 | */ | |
120 | #ifdef HAVE_TLS | |
121 | __thread struct lxc_conf *current_config; | |
122 | #else | |
123 | struct lxc_conf *current_config; | |
124 | #endif | |
125 | ||
2d76d1d7 SG |
126 | /* Define pivot_root() if missing from the C library */ |
127 | #ifndef HAVE_PIVOT_ROOT | |
9d257a2a | 128 | static int pivot_root(const char *new_root, const char *put_old) |
2d76d1d7 SG |
129 | { |
130 | #ifdef __NR_pivot_root | |
8f3e280e | 131 | return syscall(__NR_pivot_root, new_root, put_old); |
2d76d1d7 | 132 | #else |
8f3e280e CB |
133 | errno = ENOSYS; |
134 | return -1; | |
2d76d1d7 SG |
135 | #endif |
136 | } | |
137 | #else | |
9d257a2a | 138 | extern int pivot_root(const char *new_root, const char *put_old); |
8912711c CB |
139 | #endif |
140 | ||
0fd73091 CB |
141 | char *lxchook_names[NUM_LXC_HOOKS] = { |
142 | "pre-start", | |
143 | "pre-mount", | |
144 | "mount", | |
145 | "autodev", | |
146 | "start", | |
147 | "stop", | |
148 | "post-stop", | |
149 | "clone", | |
150 | "destroy", | |
151 | "start-host" | |
152 | }; | |
72d0e1cb | 153 | |
998ac676 RT |
154 | struct mount_opt { |
155 | char *name; | |
156 | int clear; | |
157 | int flag; | |
158 | }; | |
159 | ||
81810dd1 DL |
160 | struct caps_opt { |
161 | char *name; | |
162 | int value; | |
163 | }; | |
164 | ||
c6d09e15 WB |
165 | struct limit_opt { |
166 | char *name; | |
167 | int value; | |
168 | }; | |
169 | ||
998ac676 | 170 | static struct mount_opt mount_opt[] = { |
470b359b CB |
171 | { "async", 1, MS_SYNCHRONOUS }, |
172 | { "atime", 1, MS_NOATIME }, | |
173 | { "bind", 0, MS_BIND }, | |
88d413d5 | 174 | { "defaults", 0, 0 }, |
88d413d5 | 175 | { "dev", 1, MS_NODEV }, |
470b359b | 176 | { "diratime", 1, MS_NODIRATIME }, |
88d413d5 | 177 | { "dirsync", 0, MS_DIRSYNC }, |
470b359b | 178 | { "exec", 1, MS_NOEXEC }, |
8912711c | 179 | { "lazytime", 0, MS_LAZYTIME }, |
88d413d5 | 180 | { "mand", 0, MS_MANDLOCK }, |
88d413d5 | 181 | { "noatime", 0, MS_NOATIME }, |
470b359b | 182 | { "nodev", 0, MS_NODEV }, |
88d413d5 | 183 | { "nodiratime", 0, MS_NODIRATIME }, |
470b359b CB |
184 | { "noexec", 0, MS_NOEXEC }, |
185 | { "nomand", 1, MS_MANDLOCK }, | |
186 | { "norelatime", 1, MS_RELATIME }, | |
187 | { "nostrictatime", 1, MS_STRICTATIME }, | |
188 | { "nosuid", 0, MS_NOSUID }, | |
88d413d5 SW |
189 | { "rbind", 0, MS_BIND|MS_REC }, |
190 | { "relatime", 0, MS_RELATIME }, | |
470b359b CB |
191 | { "remount", 0, MS_REMOUNT }, |
192 | { "ro", 0, MS_RDONLY }, | |
193 | { "rw", 1, MS_RDONLY }, | |
88d413d5 | 194 | { "strictatime", 0, MS_STRICTATIME }, |
470b359b CB |
195 | { "suid", 1, MS_NOSUID }, |
196 | { "sync", 0, MS_SYNCHRONOUS }, | |
88d413d5 | 197 | { NULL, 0, 0 }, |
998ac676 RT |
198 | }; |
199 | ||
d840039e | 200 | static struct mount_opt propagation_opt[] = { |
0fd73091 CB |
201 | { "private", 0, MS_PRIVATE }, |
202 | { "shared", 0, MS_SHARED }, | |
203 | { "slave", 0, MS_SLAVE }, | |
204 | { "unbindable", 0, MS_UNBINDABLE }, | |
205 | { "rprivate", 0, MS_PRIVATE|MS_REC }, | |
206 | { "rshared", 0, MS_SHARED|MS_REC }, | |
207 | { "rslave", 0, MS_SLAVE|MS_REC }, | |
208 | { "runbindable", 0, MS_UNBINDABLE|MS_REC }, | |
209 | { NULL, 0, 0 }, | |
d840039e YT |
210 | }; |
211 | ||
81810dd1 | 212 | static struct caps_opt caps_opt[] = { |
8560cd36 | 213 | #if HAVE_LIBCAP |
0fd73091 CB |
214 | { "chown", CAP_CHOWN }, |
215 | { "dac_override", CAP_DAC_OVERRIDE }, | |
216 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
217 | { "fowner", CAP_FOWNER }, | |
218 | { "fsetid", CAP_FSETID }, | |
219 | { "kill", CAP_KILL }, | |
220 | { "setgid", CAP_SETGID }, | |
221 | { "setuid", CAP_SETUID }, | |
222 | { "setpcap", CAP_SETPCAP }, | |
223 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
224 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
225 | { "net_broadcast", CAP_NET_BROADCAST }, | |
226 | { "net_admin", CAP_NET_ADMIN }, | |
227 | { "net_raw", CAP_NET_RAW }, | |
228 | { "ipc_lock", CAP_IPC_LOCK }, | |
229 | { "ipc_owner", CAP_IPC_OWNER }, | |
230 | { "sys_module", CAP_SYS_MODULE }, | |
231 | { "sys_rawio", CAP_SYS_RAWIO }, | |
232 | { "sys_chroot", CAP_SYS_CHROOT }, | |
233 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
234 | { "sys_pacct", CAP_SYS_PACCT }, | |
235 | { "sys_admin", CAP_SYS_ADMIN }, | |
236 | { "sys_boot", CAP_SYS_BOOT }, | |
237 | { "sys_nice", CAP_SYS_NICE }, | |
238 | { "sys_resource", CAP_SYS_RESOURCE }, | |
239 | { "sys_time", CAP_SYS_TIME }, | |
240 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
241 | { "mknod", CAP_MKNOD }, | |
242 | { "lease", CAP_LEASE }, | |
57b837e2 | 243 | #ifdef CAP_AUDIT_READ |
0fd73091 | 244 | { "audit_read", CAP_AUDIT_READ }, |
57b837e2 | 245 | #endif |
9527e566 | 246 | #ifdef CAP_AUDIT_WRITE |
0fd73091 | 247 | { "audit_write", CAP_AUDIT_WRITE }, |
9527e566 FW |
248 | #endif |
249 | #ifdef CAP_AUDIT_CONTROL | |
0fd73091 | 250 | { "audit_control", CAP_AUDIT_CONTROL }, |
9527e566 | 251 | #endif |
0fd73091 CB |
252 | { "setfcap", CAP_SETFCAP }, |
253 | { "mac_override", CAP_MAC_OVERRIDE }, | |
254 | { "mac_admin", CAP_MAC_ADMIN }, | |
5170c716 | 255 | #ifdef CAP_SYSLOG |
0fd73091 | 256 | { "syslog", CAP_SYSLOG }, |
5170c716 CS |
257 | #endif |
258 | #ifdef CAP_WAKE_ALARM | |
0fd73091 | 259 | { "wake_alarm", CAP_WAKE_ALARM }, |
5170c716 | 260 | #endif |
2b54359b | 261 | #ifdef CAP_BLOCK_SUSPEND |
0fd73091 | 262 | { "block_suspend", CAP_BLOCK_SUSPEND }, |
2b54359b | 263 | #endif |
495d2046 | 264 | #endif |
8560cd36 | 265 | }; |
81810dd1 | 266 | |
c6d09e15 WB |
267 | static struct limit_opt limit_opt[] = { |
268 | #ifdef RLIMIT_AS | |
269 | { "as", RLIMIT_AS }, | |
270 | #endif | |
271 | #ifdef RLIMIT_CORE | |
272 | { "core", RLIMIT_CORE }, | |
273 | #endif | |
274 | #ifdef RLIMIT_CPU | |
275 | { "cpu", RLIMIT_CPU }, | |
276 | #endif | |
277 | #ifdef RLIMIT_DATA | |
278 | { "data", RLIMIT_DATA }, | |
279 | #endif | |
280 | #ifdef RLIMIT_FSIZE | |
281 | { "fsize", RLIMIT_FSIZE }, | |
282 | #endif | |
283 | #ifdef RLIMIT_LOCKS | |
284 | { "locks", RLIMIT_LOCKS }, | |
285 | #endif | |
286 | #ifdef RLIMIT_MEMLOCK | |
287 | { "memlock", RLIMIT_MEMLOCK }, | |
288 | #endif | |
289 | #ifdef RLIMIT_MSGQUEUE | |
290 | { "msgqueue", RLIMIT_MSGQUEUE }, | |
291 | #endif | |
292 | #ifdef RLIMIT_NICE | |
293 | { "nice", RLIMIT_NICE }, | |
294 | #endif | |
295 | #ifdef RLIMIT_NOFILE | |
296 | { "nofile", RLIMIT_NOFILE }, | |
297 | #endif | |
298 | #ifdef RLIMIT_NPROC | |
299 | { "nproc", RLIMIT_NPROC }, | |
300 | #endif | |
301 | #ifdef RLIMIT_RSS | |
302 | { "rss", RLIMIT_RSS }, | |
303 | #endif | |
304 | #ifdef RLIMIT_RTPRIO | |
305 | { "rtprio", RLIMIT_RTPRIO }, | |
306 | #endif | |
307 | #ifdef RLIMIT_RTTIME | |
308 | { "rttime", RLIMIT_RTTIME }, | |
309 | #endif | |
310 | #ifdef RLIMIT_SIGPENDING | |
311 | { "sigpending", RLIMIT_SIGPENDING }, | |
312 | #endif | |
313 | #ifdef RLIMIT_STACK | |
314 | { "stack", RLIMIT_STACK }, | |
315 | #endif | |
316 | }; | |
317 | ||
91c3830e SH |
318 | static int run_buffer(char *buffer) |
319 | { | |
8e7da691 | 320 | int ret; |
0fd73091 CB |
321 | char *output; |
322 | struct lxc_popen_FILE *f; | |
91c3830e | 323 | |
ebec9176 | 324 | f = lxc_popen(buffer); |
91c3830e | 325 | if (!f) { |
3f60c2f7 | 326 | SYSERROR("Failed to popen() %s", buffer); |
91c3830e SH |
327 | return -1; |
328 | } | |
329 | ||
330 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
331 | if (!output) { | |
3f60c2f7 | 332 | ERROR("Failed to allocate memory for %s", buffer); |
ebec9176 | 333 | lxc_pclose(f); |
91c3830e SH |
334 | return -1; |
335 | } | |
336 | ||
062b72c6 | 337 | while (fgets(output, LXC_LOG_BUFFER_SIZE, f->f)) |
3f60c2f7 | 338 | DEBUG("Script %s with output: %s", buffer, output); |
91c3830e SH |
339 | |
340 | free(output); | |
341 | ||
ebec9176 | 342 | ret = lxc_pclose(f); |
8e7da691 | 343 | if (ret == -1) { |
3f60c2f7 | 344 | SYSERROR("Script exited with error"); |
91c3830e | 345 | return -1; |
8e7da691 | 346 | } else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) { |
3f60c2f7 | 347 | ERROR("Script exited with status %d", WEXITSTATUS(ret)); |
8e7da691 DE |
348 | return -1; |
349 | } else if (WIFSIGNALED(ret)) { | |
3f60c2f7 | 350 | ERROR("Script terminated by signal %d", WTERMSIG(ret)); |
8e7da691 | 351 | return -1; |
91c3830e SH |
352 | } |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
14a7b0f9 CB |
357 | int run_script_argv(const char *name, unsigned int hook_version, |
358 | const char *section, const char *script, | |
586b1ce7 | 359 | const char *hookname, char **argv) |
148e91f5 | 360 | { |
3f60c2f7 | 361 | int buf_pos, i, ret; |
148e91f5 | 362 | char *buffer; |
6f8d00d2 | 363 | int fret = -1; |
d08e5708 | 364 | size_t size = 0; |
148e91f5 | 365 | |
3f60c2f7 CB |
366 | if (hook_version == 0) |
367 | INFO("Executing script \"%s\" for container \"%s\", config " | |
368 | "section \"%s\"", script, name, section); | |
369 | else | |
370 | INFO("Executing script \"%s\" for container \"%s\"", script, name); | |
148e91f5 | 371 | |
586b1ce7 CB |
372 | for (i = 0; argv && argv[i]; i++) |
373 | size += strlen(argv[i]) + 1; | |
148e91f5 | 374 | |
3f60c2f7 | 375 | size += sizeof("exec"); |
148e91f5 | 376 | size += strlen(script); |
3f60c2f7 CB |
377 | size++; |
378 | ||
148e91f5 | 379 | if (size > INT_MAX) |
3f60c2f7 | 380 | return -EFBIG; |
148e91f5 | 381 | |
3f60c2f7 | 382 | if (hook_version == 0) { |
d08e5708 CB |
383 | size += strlen(hookname); |
384 | size++; | |
385 | ||
386 | size += strlen(name); | |
387 | size++; | |
388 | ||
389 | size += strlen(section); | |
390 | size++; | |
391 | ||
392 | if (size > INT_MAX) | |
393 | return -EFBIG; | |
327cce76 | 394 | } |
3f60c2f7 | 395 | |
6f8d00d2 CB |
396 | buffer = malloc(size); |
397 | if (!buffer) | |
398 | return -ENOMEM; | |
399 | ||
327cce76 | 400 | if (hook_version == 0) |
3f60c2f7 | 401 | buf_pos = snprintf(buffer, size, "exec %s %s %s %s", script, name, section, hookname); |
327cce76 | 402 | else |
3f60c2f7 | 403 | buf_pos = snprintf(buffer, size, "exec %s", script); |
327cce76 CB |
404 | if (buf_pos < 0 || (size_t)buf_pos >= size) { |
405 | ERROR("Failed to create command line for script \"%s\"", script); | |
6f8d00d2 | 406 | goto on_error; |
327cce76 | 407 | } |
3f60c2f7 | 408 | |
327cce76 | 409 | if (hook_version == 1) { |
3f60c2f7 CB |
410 | ret = setenv("LXC_HOOK_TYPE", hookname, 1); |
411 | if (ret < 0) { | |
412 | SYSERROR("Failed to set environment variable: " | |
413 | "LXC_HOOK_TYPE=%s", hookname); | |
6f8d00d2 | 414 | goto on_error; |
3f60c2f7 | 415 | } |
90f20466 | 416 | TRACE("Set environment variable: LXC_HOOK_TYPE=%s", hookname); |
3f60c2f7 CB |
417 | |
418 | ret = setenv("LXC_HOOK_SECTION", section, 1); | |
419 | if (ret < 0) { | |
420 | SYSERROR("Failed to set environment variable: " | |
421 | "LXC_HOOK_SECTION=%s", section); | |
6f8d00d2 | 422 | goto on_error; |
3f60c2f7 CB |
423 | } |
424 | TRACE("Set environment variable: LXC_HOOK_SECTION=%s", section); | |
14a7b0f9 CB |
425 | |
426 | if (strcmp(section, "net") == 0) { | |
427 | char *parent; | |
428 | ||
586b1ce7 | 429 | if (!argv || !argv[0]) |
6f8d00d2 | 430 | goto on_error; |
14a7b0f9 | 431 | |
586b1ce7 | 432 | ret = setenv("LXC_NET_TYPE", argv[0], 1); |
14a7b0f9 CB |
433 | if (ret < 0) { |
434 | SYSERROR("Failed to set environment variable: " | |
586b1ce7 | 435 | "LXC_NET_TYPE=%s", argv[0]); |
6f8d00d2 | 436 | goto on_error; |
14a7b0f9 | 437 | } |
586b1ce7 | 438 | TRACE("Set environment variable: LXC_NET_TYPE=%s", argv[0]); |
14a7b0f9 | 439 | |
586b1ce7 | 440 | parent = argv[1] ? argv[1] : ""; |
14a7b0f9 | 441 | |
586b1ce7 | 442 | if (strcmp(argv[0], "macvlan")) { |
14a7b0f9 CB |
443 | ret = setenv("LXC_NET_PARENT", parent, 1); |
444 | if (ret < 0) { | |
445 | SYSERROR("Failed to set environment " | |
446 | "variable: LXC_NET_PARENT=%s", parent); | |
6f8d00d2 | 447 | goto on_error; |
14a7b0f9 CB |
448 | } |
449 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
586b1ce7 | 450 | } else if (strcmp(argv[0], "phys")) { |
14a7b0f9 CB |
451 | ret = setenv("LXC_NET_PARENT", parent, 1); |
452 | if (ret < 0) { | |
453 | SYSERROR("Failed to set environment " | |
454 | "variable: LXC_NET_PARENT=%s", parent); | |
6f8d00d2 | 455 | goto on_error; |
14a7b0f9 CB |
456 | } |
457 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
586b1ce7 CB |
458 | } else if (strcmp(argv[0], "veth")) { |
459 | char *peer = argv[2] ? argv[2] : ""; | |
14a7b0f9 CB |
460 | |
461 | ret = setenv("LXC_NET_PEER", peer, 1); | |
462 | if (ret < 0) { | |
463 | SYSERROR("Failed to set environment " | |
464 | "variable: LXC_NET_PEER=%s", peer); | |
6f8d00d2 | 465 | goto on_error; |
14a7b0f9 CB |
466 | } |
467 | TRACE("Set environment variable: LXC_NET_PEER=%s", peer); | |
468 | ||
469 | ret = setenv("LXC_NET_PARENT", parent, 1); | |
470 | if (ret < 0) { | |
471 | SYSERROR("Failed to set environment " | |
472 | "variable: LXC_NET_PARENT=%s", parent); | |
6f8d00d2 | 473 | goto on_error; |
14a7b0f9 CB |
474 | } |
475 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
476 | } | |
477 | } | |
148e91f5 SH |
478 | } |
479 | ||
586b1ce7 | 480 | for (i = 0; argv && argv[i]; i++) { |
3f60c2f7 CB |
481 | size_t len = size - buf_pos; |
482 | ||
586b1ce7 | 483 | ret = snprintf(buffer + buf_pos, len, " %s", argv[i]); |
3f60c2f7 CB |
484 | if (ret < 0 || (size_t)ret >= len) { |
485 | ERROR("Failed to create command line for script \"%s\"", script); | |
6f8d00d2 | 486 | goto on_error; |
148e91f5 | 487 | } |
3f60c2f7 | 488 | buf_pos += ret; |
148e91f5 SH |
489 | } |
490 | ||
6f8d00d2 CB |
491 | fret = run_buffer(buffer); |
492 | ||
493 | on_error: | |
494 | free(buffer); | |
495 | return fret; | |
148e91f5 SH |
496 | } |
497 | ||
811ef482 | 498 | int run_script(const char *name, const char *section, const char *script, ...) |
e3b4c4c4 | 499 | { |
abbfd20b | 500 | int ret; |
91c3830e | 501 | char *buffer, *p; |
abbfd20b | 502 | va_list ap; |
0fd73091 | 503 | size_t size = 0; |
751d9dcd | 504 | |
0fd73091 | 505 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\"", |
751d9dcd | 506 | script, name, section); |
e3b4c4c4 | 507 | |
abbfd20b DL |
508 | va_start(ap, script); |
509 | while ((p = va_arg(ap, char *))) | |
95642a10 | 510 | size += strlen(p) + 1; |
abbfd20b DL |
511 | va_end(ap); |
512 | ||
6d1a5f93 | 513 | size += strlen("exec"); |
abbfd20b DL |
514 | size += strlen(script); |
515 | size += strlen(name); | |
516 | size += strlen(section); | |
6d1a5f93 | 517 | size += 4; |
abbfd20b | 518 | |
95642a10 MS |
519 | if (size > INT_MAX) |
520 | return -1; | |
521 | ||
522 | buffer = alloca(size); | |
6d1a5f93 | 523 | ret = snprintf(buffer, size, "exec %s %s %s", script, name, section); |
0fd73091 | 524 | if (ret < 0 || ret >= size) |
9ba8130c | 525 | return -1; |
751d9dcd | 526 | |
abbfd20b | 527 | va_start(ap, script); |
9ba8130c | 528 | while ((p = va_arg(ap, char *))) { |
062b72c6 | 529 | int len = size - ret; |
9ba8130c SH |
530 | int rc; |
531 | rc = snprintf(buffer + ret, len, " %s", p); | |
0fd73091 | 532 | if (rc < 0 || rc >= len) |
9ba8130c | 533 | return -1; |
9ba8130c SH |
534 | ret += rc; |
535 | } | |
abbfd20b | 536 | va_end(ap); |
751d9dcd | 537 | |
91c3830e | 538 | return run_buffer(buffer); |
e3b4c4c4 ST |
539 | } |
540 | ||
0fd73091 | 541 | /* pin_rootfs |
b7ed4bf0 CS |
542 | * if rootfs is a directory, then open ${rootfs}/lxc.hold for writing for |
543 | * the duration of the container run, to prevent the container from marking | |
544 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
545 | * no name pollution is happens | |
0c547523 SH |
546 | * return -1 on error. |
547 | * return -2 if nothing needed to be pinned. | |
548 | * return an open fd (>=0) if we pinned it. | |
549 | */ | |
550 | int pin_rootfs(const char *rootfs) | |
551 | { | |
0fd73091 CB |
552 | int fd, ret; |
553 | char absrootfs[MAXPATHLEN], absrootfspin[MAXPATHLEN]; | |
0c547523 | 554 | struct stat s; |
0c547523 | 555 | |
e99ee0de | 556 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 557 | return -2; |
e99ee0de | 558 | |
00ec333b | 559 | if (!realpath(rootfs, absrootfs)) |
9be53773 | 560 | return -2; |
0c547523 | 561 | |
0fd73091 CB |
562 | ret = access(absrootfs, F_OK); |
563 | if (ret != 0) | |
0c547523 | 564 | return -1; |
0c547523 | 565 | |
0fd73091 CB |
566 | ret = stat(absrootfs, &s); |
567 | if (ret < 0) | |
0c547523 | 568 | return -1; |
0c547523 | 569 | |
72f919c4 | 570 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
571 | return -2; |
572 | ||
b7ed4bf0 | 573 | ret = snprintf(absrootfspin, MAXPATHLEN, "%s/lxc.hold", absrootfs); |
00ec333b | 574 | if (ret >= MAXPATHLEN) |
0c547523 | 575 | return -1; |
0c547523 | 576 | |
0fd73091 | 577 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR | S_IRUSR); |
b7ed4bf0 CS |
578 | if (fd < 0) |
579 | return fd; | |
0fd73091 | 580 | |
b7ed4bf0 | 581 | (void)unlink(absrootfspin); |
0fd73091 | 582 | |
0c547523 SH |
583 | return fd; |
584 | } | |
585 | ||
0fd73091 CB |
586 | /* If we are asking to remount something, make sure that any NOEXEC etc are |
587 | * honored. | |
e2a7e8dc | 588 | */ |
5ae72b98 | 589 | unsigned long add_required_remount_flags(const char *s, const char *d, |
5285689c | 590 | unsigned long flags) |
e2a7e8dc | 591 | { |
614305f3 | 592 | #ifdef HAVE_STATVFS |
0fd73091 | 593 | int ret; |
e2a7e8dc SH |
594 | struct statvfs sb; |
595 | unsigned long required_flags = 0; | |
596 | ||
597 | if (!(flags & MS_REMOUNT)) | |
598 | return flags; | |
599 | ||
600 | if (!s) | |
601 | s = d; | |
602 | ||
603 | if (!s) | |
604 | return flags; | |
0fd73091 CB |
605 | |
606 | ret = statvfs(s, &sb); | |
607 | if (ret < 0) | |
e2a7e8dc SH |
608 | return flags; |
609 | ||
610 | if (sb.f_flag & MS_NOSUID) | |
611 | required_flags |= MS_NOSUID; | |
612 | if (sb.f_flag & MS_NODEV) | |
613 | required_flags |= MS_NODEV; | |
614 | if (sb.f_flag & MS_RDONLY) | |
615 | required_flags |= MS_RDONLY; | |
616 | if (sb.f_flag & MS_NOEXEC) | |
617 | required_flags |= MS_NOEXEC; | |
618 | ||
619 | return flags | required_flags; | |
614305f3 SH |
620 | #else |
621 | return flags; | |
622 | #endif | |
e2a7e8dc SH |
623 | } |
624 | ||
4fb3cba5 | 625 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 626 | { |
0fd73091 | 627 | int i, r; |
b06b8511 CS |
628 | static struct { |
629 | int match_mask; | |
630 | int match_flag; | |
631 | const char *source; | |
632 | const char *destination; | |
633 | const char *fstype; | |
634 | unsigned long flags; | |
635 | const char *options; | |
636 | } default_mounts[] = { | |
0fd73091 CB |
637 | /* Read-only bind-mounting... In older kernels, doing that |
638 | * required to do one MS_BIND mount and then | |
639 | * MS_REMOUNT|MS_RDONLY the same one. According to mount(2) | |
640 | * manpage, MS_BIND honors MS_RDONLY from kernel 2.6.26 | |
641 | * onwards. However, this apparently does not work on kernel | |
642 | * 3.8. Unfortunately, on that very same kernel, doing the same | |
643 | * trick as above doesn't seem to work either, there one needs | |
644 | * to ALSO specify MS_BIND for the remount, otherwise the | |
645 | * entire fs is remounted read-only or the mount fails because | |
646 | * it's busy... MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for | |
647 | * kernels as low as 2.6.32... | |
368bbc02 | 648 | */ |
0fd73091 | 649 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
592fd47a | 650 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
0fd73091 CB |
651 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL }, |
652 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, | |
653 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
654 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL }, | |
655 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, | |
656 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
657 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
658 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
659 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
660 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
661 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys", "%r/sys", NULL, MS_BIND, NULL }, | |
662 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
663 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
664 | { 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 }, | |
665 | { 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 }, | |
666 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 667 | }; |
368bbc02 | 668 | |
b06b8511 | 669 | for (i = 0; default_mounts[i].match_mask; i++) { |
0fd73091 CB |
670 | int saved_errno; |
671 | unsigned long mflags; | |
672 | char *destination = NULL; | |
673 | char *source = NULL; | |
674 | if ((flags & default_mounts[i].match_mask) != default_mounts[i].match_flag) | |
675 | continue; | |
676 | ||
677 | if (default_mounts[i].source) { | |
cc4fd506 | 678 | /* will act like strdup if %r is not present */ |
0fd73091 CB |
679 | source = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].source); |
680 | if (!source) | |
cc4fd506 | 681 | return -1; |
0fd73091 | 682 | } |
f24a52d5 | 683 | |
0fd73091 CB |
684 | if (!default_mounts[i].destination) { |
685 | ERROR("BUG: auto mounts destination %d was NULL", i); | |
b06b8511 | 686 | free(source); |
0fd73091 CB |
687 | return -1; |
688 | } | |
689 | ||
690 | /* will act like strdup if %r is not present */ | |
691 | destination = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].destination); | |
692 | if (!destination) { | |
693 | saved_errno = errno; | |
694 | free(source); | |
695 | errno = saved_errno; | |
696 | return -1; | |
697 | } | |
698 | ||
699 | mflags = add_required_remount_flags(source, destination, | |
700 | default_mounts[i].flags); | |
701 | r = safe_mount(source, destination, default_mounts[i].fstype, | |
702 | mflags, default_mounts[i].options, | |
703 | conf->rootfs.path ? conf->rootfs.mount : NULL); | |
704 | saved_errno = errno; | |
705 | if (r < 0 && errno == ENOENT) { | |
706 | INFO("Mount source or target for \"%s\" on \"%s\" does " | |
707 | "not exist. Skipping", source, destination); | |
708 | r = 0; | |
709 | } else if (r < 0) { | |
710 | SYSERROR("Failed to mount \"%s\" on \"%s\" with flags %lu", source, destination, mflags); | |
711 | } | |
712 | ||
713 | free(source); | |
714 | free(destination); | |
715 | if (r < 0) { | |
716 | errno = saved_errno; | |
717 | return -1; | |
368bbc02 | 718 | } |
368bbc02 CS |
719 | } |
720 | ||
b06b8511 | 721 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
722 | int cg_flags; |
723 | ||
3f69fb12 | 724 | cg_flags = flags & (LXC_AUTO_CGROUP_MASK & ~LXC_AUTO_CGROUP_FORCE); |
0fd73091 CB |
725 | /* If the type of cgroup mount was not specified, it depends on |
726 | * the container's capabilities as to what makes sense: if we | |
727 | * have CAP_SYS_ADMIN, the read-only part can be remounted | |
728 | * read-write anyway, so we may as well default to read-write; | |
729 | * then the admin will not be given a false sense of security. | |
730 | * (And if they really want mixed r/o r/w, then they can | |
731 | * explicitly specify :mixed.) OTOH, if the container lacks | |
732 | * CAP_SYS_ADMIN, do only default to :mixed, because then the | |
733 | * container can't remount it read-write. | |
734 | */ | |
0769b82a CS |
735 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { |
736 | int has_sys_admin = 0; | |
b0ee5983 CB |
737 | |
738 | if (!lxc_list_empty(&conf->keepcaps)) | |
0769b82a | 739 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); |
b0ee5983 | 740 | else |
0769b82a | 741 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); |
b0ee5983 CB |
742 | |
743 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) | |
0769b82a | 744 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; |
b0ee5983 | 745 | else |
0769b82a | 746 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; |
0769b82a | 747 | } |
0fd73091 | 748 | |
3f69fb12 | 749 | if (flags & LXC_AUTO_CGROUP_FORCE) |
0fd73091 CB |
750 | cg_flags |= LXC_AUTO_CGROUP_FORCE; |
751 | ||
8ede5f4c | 752 | if (!cgroup_mount(conf->rootfs.path ? conf->rootfs.mount : "", handler, cg_flags)) { |
0fd73091 | 753 | SYSERROR("Failed to mount \"/sys/fs/cgroup\""); |
b06b8511 | 754 | return -1; |
368bbc02 CS |
755 | } |
756 | } | |
757 | ||
368bbc02 | 758 | return 0; |
368bbc02 CS |
759 | } |
760 | ||
4e5440c6 | 761 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 762 | { |
0fd73091 CB |
763 | int ret; |
764 | ||
4e5440c6 DL |
765 | if (!utsname) |
766 | return 0; | |
0ad19a3f | 767 | |
0fd73091 CB |
768 | ret = sethostname(utsname->nodename, strlen(utsname->nodename)); |
769 | if (ret < 0) { | |
770 | SYSERROR("Failed to set the hostname to \"%s\"", utsname->nodename); | |
0ad19a3f | 771 | return -1; |
772 | } | |
773 | ||
0fd73091 | 774 | INFO("Set hostname to \"%s\"", utsname->nodename); |
cd54d859 | 775 | |
0ad19a3f | 776 | return 0; |
777 | } | |
778 | ||
69aa6655 DE |
779 | struct dev_symlinks { |
780 | const char *oldpath; | |
781 | const char *name; | |
782 | }; | |
783 | ||
784 | static const struct dev_symlinks dev_symlinks[] = { | |
0fd73091 CB |
785 | { "/proc/self/fd", "fd" }, |
786 | { "/proc/self/fd/0", "stdin" }, | |
787 | { "/proc/self/fd/1", "stdout" }, | |
788 | { "/proc/self/fd/2", "stderr" }, | |
69aa6655 DE |
789 | }; |
790 | ||
ed8704d0 | 791 | static int lxc_setup_dev_symlinks(const struct lxc_rootfs *rootfs) |
69aa6655 | 792 | { |
0fd73091 | 793 | int i, ret; |
69aa6655 | 794 | char path[MAXPATHLEN]; |
09227be2 | 795 | struct stat s; |
69aa6655 | 796 | |
69aa6655 DE |
797 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { |
798 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
0fd73091 CB |
799 | |
800 | ret = snprintf(path, sizeof(path), "%s/dev/%s", | |
801 | rootfs->path ? rootfs->mount : "", d->name); | |
69aa6655 DE |
802 | if (ret < 0 || ret >= MAXPATHLEN) |
803 | return -1; | |
09227be2 | 804 | |
0fd73091 CB |
805 | /* Stat the path first. If we don't get an error accept it as |
806 | * is and don't try to create it | |
09227be2 | 807 | */ |
0fd73091 CB |
808 | ret = stat(path, &s); |
809 | if (ret == 0) | |
09227be2 | 810 | continue; |
09227be2 | 811 | |
69aa6655 DE |
812 | ret = symlink(d->oldpath, path); |
813 | if (ret && errno != EEXIST) { | |
0fd73091 CB |
814 | if (errno == EROFS) { |
815 | WARN("Failed to create \"%s\". Read-only filesystem", path); | |
09227be2 | 816 | } else { |
0fd73091 | 817 | SYSERROR("Failed to create \"%s\"", path); |
09227be2 MW |
818 | return -1; |
819 | } | |
69aa6655 DE |
820 | } |
821 | } | |
0fd73091 | 822 | |
69aa6655 DE |
823 | return 0; |
824 | } | |
825 | ||
2187efd3 | 826 | /* Build a space-separate list of ptys to pass to systemd. */ |
393903d1 | 827 | static bool append_ptyname(char **pp, char *name) |
b0a33c1e | 828 | { |
393903d1 SH |
829 | char *p; |
830 | ||
831 | if (!*pp) { | |
832 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
833 | if (!*pp) | |
834 | return false; | |
0fd73091 | 835 | |
393903d1 SH |
836 | sprintf(*pp, "container_ttys=%s", name); |
837 | return true; | |
838 | } | |
0fd73091 | 839 | |
393903d1 SH |
840 | p = realloc(*pp, strlen(*pp) + strlen(name) + 2); |
841 | if (!p) | |
842 | return false; | |
0fd73091 | 843 | |
393903d1 SH |
844 | *pp = p; |
845 | strcat(p, " "); | |
846 | strcat(p, name); | |
0fd73091 | 847 | |
393903d1 SH |
848 | return true; |
849 | } | |
850 | ||
2187efd3 | 851 | static int lxc_setup_ttys(struct lxc_conf *conf) |
393903d1 | 852 | { |
9e1045e3 | 853 | int i, ret; |
0e4be3cf | 854 | const struct lxc_tty_info *ttys = &conf->ttys; |
393903d1 | 855 | char *ttydir = conf->ttydir; |
7c6ef2a2 | 856 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
b0a33c1e | 857 | |
e8bd4e43 | 858 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
859 | return 0; |
860 | ||
0e4be3cf CB |
861 | for (i = 0; i < ttys->nbtty; i++) { |
862 | struct lxc_terminal_info *tty = &ttys->tty[i]; | |
b0a33c1e | 863 | |
e8bd4e43 | 864 | ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1); |
73363c61 | 865 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 866 | return -1; |
9e1045e3 | 867 | |
7c6ef2a2 SH |
868 | if (ttydir) { |
869 | /* create dev/lxc/tty%d" */ | |
9e1045e3 CB |
870 | ret = snprintf(lxcpath, sizeof(lxcpath), |
871 | "/dev/%s/tty%d", ttydir, i + 1); | |
73363c61 | 872 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
7c6ef2a2 | 873 | return -1; |
9e1045e3 | 874 | |
7c6ef2a2 | 875 | ret = creat(lxcpath, 0660); |
9e1045e3 | 876 | if (ret < 0 && errno != EEXIST) { |
73363c61 | 877 | SYSERROR("Failed to create \"%s\"", lxcpath); |
7c6ef2a2 SH |
878 | return -1; |
879 | } | |
4d44e274 SH |
880 | if (ret >= 0) |
881 | close(ret); | |
9e1045e3 | 882 | |
7c6ef2a2 | 883 | ret = unlink(path); |
9e1045e3 | 884 | if (ret < 0 && errno != ENOENT) { |
73363c61 | 885 | SYSERROR("Failed to unlink \"%s\"", path); |
7c6ef2a2 SH |
886 | return -1; |
887 | } | |
b0a33c1e | 888 | |
2520facd | 889 | ret = mount(tty->name, lxcpath, "none", MS_BIND, 0); |
9e1045e3 | 890 | if (ret < 0) { |
73363c61 | 891 | WARN("Failed to bind mount \"%s\" onto \"%s\"", |
2520facd | 892 | tty->name, path); |
7c6ef2a2 SH |
893 | continue; |
894 | } | |
0fd73091 | 895 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, |
9e1045e3 | 896 | path); |
13954cce | 897 | |
9e1045e3 CB |
898 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", |
899 | ttydir, i + 1); | |
73363c61 | 900 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
9ba8130c | 901 | return -1; |
9e1045e3 | 902 | |
7c6ef2a2 | 903 | ret = symlink(lxcpath, path); |
9e1045e3 | 904 | if (ret < 0) { |
73363c61 | 905 | SYSERROR("Failed to create symlink \"%s\" -> \"%s\"", |
9e1045e3 | 906 | path, lxcpath); |
7c6ef2a2 SH |
907 | return -1; |
908 | } | |
909 | } else { | |
9e1045e3 CB |
910 | /* If we populated /dev, then we need to create |
911 | * /dev/ttyN | |
912 | */ | |
913 | ret = access(path, F_OK); | |
914 | if (ret < 0) { | |
c6883f38 | 915 | ret = creat(path, 0660); |
9e1045e3 | 916 | if (ret < 0) { |
73363c61 | 917 | SYSERROR("Failed to create \"%s\"", path); |
c6883f38 | 918 | /* this isn't fatal, continue */ |
025ed0f3 | 919 | } else { |
c6883f38 | 920 | close(ret); |
025ed0f3 | 921 | } |
c6883f38 | 922 | } |
9e1045e3 | 923 | |
2520facd | 924 | ret = mount(tty->name, path, "none", MS_BIND, 0); |
9e1045e3 | 925 | if (ret < 0) { |
2520facd | 926 | SYSERROR("Failed to mount '%s'->'%s'", tty->name, path); |
7c6ef2a2 SH |
927 | continue; |
928 | } | |
9e1045e3 | 929 | |
2520facd | 930 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, |
9e1045e3 | 931 | path); |
393903d1 | 932 | } |
9e1045e3 | 933 | |
2520facd | 934 | if (!append_ptyname(&conf->pty_names, tty->name)) { |
393903d1 SH |
935 | ERROR("Error setting up container_ttys string"); |
936 | return -1; | |
b0a33c1e | 937 | } |
938 | } | |
939 | ||
0e4be3cf | 940 | INFO("Finished setting up %d /dev/tty<N> device(s)", ttys->nbtty); |
b0a33c1e | 941 | return 0; |
942 | } | |
943 | ||
2187efd3 CB |
944 | int lxc_allocate_ttys(const char *name, struct lxc_conf *conf) |
945 | { | |
2187efd3 | 946 | int i, ret; |
0fd73091 | 947 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 CB |
948 | |
949 | /* no tty in the configuration */ | |
950 | if (!conf->tty) | |
951 | return 0; | |
952 | ||
0e4be3cf CB |
953 | ttys->tty = malloc(sizeof(*ttys->tty) * conf->tty); |
954 | if (!ttys->tty) | |
2187efd3 | 955 | return -ENOMEM; |
2187efd3 CB |
956 | |
957 | for (i = 0; i < conf->tty; i++) { | |
0e4be3cf | 958 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 959 | |
2520facd CB |
960 | ret = openpty(&tty->master, &tty->slave, |
961 | tty->name, NULL, NULL); | |
2187efd3 | 962 | if (ret) { |
0fd73091 | 963 | SYSERROR("Failed to create tty %d", i); |
0e4be3cf CB |
964 | ttys->nbtty = i; |
965 | lxc_delete_tty(ttys); | |
2187efd3 CB |
966 | return -ENOTTY; |
967 | } | |
968 | ||
0fd73091 | 969 | DEBUG("Created tty \"%s\" with master fd %d and slave fd %d", |
2520facd | 970 | tty->name, tty->master, tty->slave); |
2187efd3 CB |
971 | |
972 | /* Prevent leaking the file descriptors to the container */ | |
2520facd | 973 | ret = fcntl(tty->master, F_SETFD, FD_CLOEXEC); |
2187efd3 | 974 | if (ret < 0) |
0fd73091 CB |
975 | WARN("Failed to set FD_CLOEXEC flag on master fd %d of " |
976 | "tty device \"%s\": %s", | |
2520facd | 977 | tty->master, tty->name, strerror(errno)); |
2187efd3 | 978 | |
2520facd | 979 | ret = fcntl(tty->slave, F_SETFD, FD_CLOEXEC); |
2187efd3 | 980 | if (ret < 0) |
0fd73091 CB |
981 | WARN("Failed to set FD_CLOEXEC flag on slave fd %d of " |
982 | "tty device \"%s\": %s", | |
2520facd | 983 | tty->slave, tty->name, strerror(errno)); |
2187efd3 | 984 | |
2520facd | 985 | tty->busy = 0; |
2187efd3 CB |
986 | } |
987 | ||
0e4be3cf | 988 | ttys->nbtty = conf->tty; |
2187efd3 | 989 | |
0fd73091 | 990 | INFO("Finished creating %d tty devices", conf->tty); |
2187efd3 CB |
991 | return 0; |
992 | } | |
993 | ||
0e4be3cf | 994 | void lxc_delete_tty(struct lxc_tty_info *ttys) |
2187efd3 CB |
995 | { |
996 | int i; | |
997 | ||
0e4be3cf CB |
998 | for (i = 0; i < ttys->nbtty; i++) { |
999 | struct lxc_terminal_info *tty = &ttys->tty[i]; | |
2187efd3 | 1000 | |
2520facd CB |
1001 | close(tty->master); |
1002 | close(tty->slave); | |
2187efd3 CB |
1003 | } |
1004 | ||
0e4be3cf CB |
1005 | free(ttys->tty); |
1006 | ttys->tty = NULL; | |
1007 | ttys->nbtty = 0; | |
2187efd3 CB |
1008 | } |
1009 | ||
1010 | static int lxc_send_ttys_to_parent(struct lxc_handler *handler) | |
1011 | { | |
1012 | int i; | |
0fd73091 | 1013 | int ret = -1; |
2187efd3 | 1014 | struct lxc_conf *conf = handler->conf; |
0e4be3cf | 1015 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 | 1016 | int sock = handler->data_sock[0]; |
2187efd3 | 1017 | |
0fd73091 | 1018 | if (conf->tty == 0) |
2187efd3 CB |
1019 | return 0; |
1020 | ||
1021 | for (i = 0; i < conf->tty; i++) { | |
1022 | int ttyfds[2]; | |
0e4be3cf | 1023 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1024 | |
2520facd CB |
1025 | ttyfds[0] = tty->master; |
1026 | ttyfds[1] = tty->slave; | |
2187efd3 CB |
1027 | |
1028 | ret = lxc_abstract_unix_send_fds(sock, ttyfds, 2, NULL, 0); | |
1029 | if (ret < 0) | |
1030 | break; | |
1031 | ||
0fd73091 | 1032 | TRACE("Sent ty \"%s\" with master fd %d and slave fd %d to " |
2520facd | 1033 | "parent", tty->name, tty->master, tty->slave); |
2187efd3 CB |
1034 | } |
1035 | ||
1036 | if (ret < 0) | |
1037 | ERROR("Failed to send %d ttys to parent: %s", conf->tty, | |
1038 | strerror(errno)); | |
1039 | else | |
1040 | TRACE("Sent %d ttys to parent", conf->tty); | |
1041 | ||
1042 | return ret; | |
1043 | } | |
1044 | ||
1045 | static int lxc_create_ttys(struct lxc_handler *handler) | |
1046 | { | |
1047 | int ret = -1; | |
1048 | struct lxc_conf *conf = handler->conf; | |
1049 | ||
1050 | ret = lxc_allocate_ttys(handler->name, conf); | |
1051 | if (ret < 0) { | |
1052 | ERROR("Failed to allocate ttys"); | |
1053 | goto on_error; | |
1054 | } | |
1055 | ||
1056 | ret = lxc_send_ttys_to_parent(handler); | |
1057 | if (ret < 0) { | |
1058 | ERROR("Failed to send ttys to parent"); | |
1059 | goto on_error; | |
1060 | } | |
1061 | ||
1062 | if (!conf->is_execute) { | |
1063 | ret = lxc_setup_ttys(conf); | |
1064 | if (ret < 0) { | |
1065 | ERROR("Failed to setup ttys"); | |
1066 | goto on_error; | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | if (conf->pty_names) { | |
1071 | ret = setenv("container_ttys", conf->pty_names, 1); | |
1072 | if (ret < 0) | |
1073 | SYSERROR("Failed to set \"container_ttys=%s\"", conf->pty_names); | |
1074 | } | |
1075 | ||
1076 | ret = 0; | |
1077 | ||
1078 | on_error: | |
0e4be3cf | 1079 | lxc_delete_tty(&conf->ttys); |
2187efd3 CB |
1080 | |
1081 | return ret; | |
1082 | } | |
1083 | ||
59bb8698 | 1084 | static int setup_rootfs_pivot_root(const char *rootfs) |
bf601689 | 1085 | { |
0fd73091 CB |
1086 | int ret; |
1087 | int newroot = -1, oldroot = -1; | |
bf601689 | 1088 | |
2d489f9e SH |
1089 | oldroot = open("/", O_DIRECTORY | O_RDONLY); |
1090 | if (oldroot < 0) { | |
0fd73091 | 1091 | SYSERROR("Failed to open old root directory"); |
9ba8130c SH |
1092 | return -1; |
1093 | } | |
0fd73091 | 1094 | |
2d489f9e SH |
1095 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY); |
1096 | if (newroot < 0) { | |
0fd73091 CB |
1097 | SYSERROR("Failed to open new root directory"); |
1098 | goto on_error; | |
c08556c6 | 1099 | } |
bf601689 | 1100 | |
cc6f6dd7 | 1101 | /* change into new root fs */ |
0fd73091 CB |
1102 | ret = fchdir(newroot); |
1103 | if (ret < 0) { | |
1104 | SYSERROR("Failed to change to new rootfs \"%s\"", rootfs); | |
1105 | goto on_error; | |
cc6f6dd7 DL |
1106 | } |
1107 | ||
cc6f6dd7 | 1108 | /* pivot_root into our new root fs */ |
0fd73091 CB |
1109 | ret = pivot_root(".", "."); |
1110 | if (ret < 0) { | |
1111 | SYSERROR("Failed to pivot_root()"); | |
1112 | goto on_error; | |
bf601689 | 1113 | } |
cc6f6dd7 | 1114 | |
0fd73091 CB |
1115 | /* At this point the old-root is mounted on top of our new-root To |
1116 | * unmounted it we must not be chdir'd into it, so escape back to | |
1117 | * old-root. | |
2d489f9e | 1118 | */ |
0fd73091 CB |
1119 | ret = fchdir(oldroot); |
1120 | if (ret < 0) { | |
1121 | SYSERROR("Failed to enter old root directory"); | |
1122 | goto on_error; | |
2d489f9e | 1123 | } |
0fd73091 CB |
1124 | |
1125 | ret = umount2(".", MNT_DETACH); | |
1126 | if (ret < 0) { | |
1127 | SYSERROR("Failed to detach old root directory"); | |
1128 | goto on_error; | |
cc6f6dd7 DL |
1129 | } |
1130 | ||
0fd73091 CB |
1131 | ret = fchdir(newroot); |
1132 | if (ret < 0) { | |
1133 | SYSERROR("Failed to re-enter new root directory"); | |
1134 | goto on_error; | |
2d489f9e | 1135 | } |
cc6f6dd7 | 1136 | |
2d489f9e SH |
1137 | close(oldroot); |
1138 | close(newroot); | |
bf601689 | 1139 | |
0fd73091 | 1140 | DEBUG("pivot_root(\"%s\") successful", rootfs); |
bf601689 | 1141 | |
bf601689 | 1142 | return 0; |
2d489f9e | 1143 | |
0fd73091 | 1144 | on_error: |
2d489f9e SH |
1145 | if (oldroot != -1) |
1146 | close(oldroot); | |
1147 | if (newroot != -1) | |
1148 | close(newroot); | |
0fd73091 | 1149 | |
2d489f9e | 1150 | return -1; |
bf601689 MH |
1151 | } |
1152 | ||
7133b912 CB |
1153 | /* Just create a path for /dev under $lxcpath/$name and in rootfs If we hit an |
1154 | * error, log it but don't fail yet. | |
91c3830e | 1155 | */ |
7133b912 CB |
1156 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, |
1157 | const char *lxcpath) | |
91c3830e SH |
1158 | { |
1159 | int ret; | |
87da4ec3 SH |
1160 | size_t clen; |
1161 | char *path; | |
91c3830e | 1162 | |
7133b912 | 1163 | INFO("Preparing \"/dev\""); |
bc6928ff | 1164 | |
14221cbb | 1165 | /* $(rootfs->mount) + "/dev/pts" + '\0' */ |
ec50007f | 1166 | clen = (rootfs->path ? strlen(rootfs->mount) : 0) + 9; |
87da4ec3 | 1167 | path = alloca(clen); |
bc6928ff | 1168 | |
ec50007f | 1169 | ret = snprintf(path, clen, "%s/dev", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1170 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1171 | return -1; |
bc6928ff | 1172 | |
87da4ec3 | 1173 | if (!dir_exists(path)) { |
7133b912 CB |
1174 | WARN("\"/dev\" directory does not exist. Proceeding without " |
1175 | "autodev being set up"); | |
87da4ec3 | 1176 | return 0; |
bc6928ff | 1177 | } |
87da4ec3 | 1178 | |
1ec0e8e3 | 1179 | ret = safe_mount("none", path, "tmpfs", 0, "size=500000,mode=755", |
7133b912 CB |
1180 | rootfs->path ? rootfs->mount : NULL); |
1181 | if (ret < 0) { | |
1182 | SYSERROR("Failed to mount tmpfs on \"%s\"", path); | |
1ec0e8e3 | 1183 | return -1; |
91c3830e | 1184 | } |
7133b912 | 1185 | INFO("Mounted tmpfs on \"%s\"", path); |
87da4ec3 | 1186 | |
ec50007f | 1187 | ret = snprintf(path, clen, "%s/dev/pts", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1188 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1189 | return -1; |
87da4ec3 | 1190 | |
7133b912 | 1191 | /* If we are running on a devtmpfs mapping, dev/pts may already exist. |
bc6928ff MW |
1192 | * If not, then create it and exit if that fails... |
1193 | */ | |
87da4ec3 | 1194 | if (!dir_exists(path)) { |
bc6928ff | 1195 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
7133b912 CB |
1196 | if (ret < 0) { |
1197 | SYSERROR("Failed to create directory \"%s\"", path); | |
bc6928ff MW |
1198 | return -1; |
1199 | } | |
91c3830e SH |
1200 | } |
1201 | ||
7133b912 | 1202 | INFO("Prepared \"/dev\""); |
91c3830e SH |
1203 | return 0; |
1204 | } | |
1205 | ||
5e73416f | 1206 | struct lxc_device_node { |
74a3920a | 1207 | const char *name; |
5e73416f CB |
1208 | const mode_t mode; |
1209 | const int maj; | |
1210 | const int min; | |
c6883f38 SH |
1211 | }; |
1212 | ||
5e73416f | 1213 | static const struct lxc_device_node lxc_devices[] = { |
06749971 | 1214 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, |
5e73416f | 1215 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
06749971 CB |
1216 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, |
1217 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
5e73416f CB |
1218 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, |
1219 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
c6883f38 SH |
1220 | }; |
1221 | ||
27245ff7 | 1222 | static int lxc_fill_autodev(const struct lxc_rootfs *rootfs) |
c6883f38 | 1223 | { |
5e73416f | 1224 | int i, ret; |
c6883f38 | 1225 | char path[MAXPATHLEN]; |
3a32201c | 1226 | mode_t cmask; |
5e73416f | 1227 | bool can_mknod = true; |
c6883f38 | 1228 | |
3999be0a CB |
1229 | ret = snprintf(path, MAXPATHLEN, "%s/dev", |
1230 | rootfs->path ? rootfs->mount : ""); | |
1231 | if (ret < 0 || ret >= MAXPATHLEN) | |
c6883f38 | 1232 | return -1; |
91c3830e | 1233 | |
0bbf8572 CB |
1234 | /* ignore, just don't try to fill in */ |
1235 | if (!dir_exists(path)) | |
9cb4d183 SH |
1236 | return 0; |
1237 | ||
3999be0a CB |
1238 | INFO("Populating \"/dev\""); |
1239 | ||
3a32201c | 1240 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
5e73416f CB |
1241 | for (i = 0; i < sizeof(lxc_devices) / sizeof(lxc_devices[0]); i++) { |
1242 | char hostpath[MAXPATHLEN]; | |
1243 | const struct lxc_device_node *device = &lxc_devices[i]; | |
0728ebf4 | 1244 | |
3999be0a | 1245 | ret = snprintf(path, MAXPATHLEN, "%s/dev/%s", |
5e73416f | 1246 | rootfs->path ? rootfs->mount : "", device->name); |
c6883f38 SH |
1247 | if (ret < 0 || ret >= MAXPATHLEN) |
1248 | return -1; | |
0bbf8572 | 1249 | |
5e73416f CB |
1250 | if (can_mknod) { |
1251 | ret = mknod(path, device->mode, makedev(device->maj, device->min)); | |
1252 | if (ret == 0 || (ret < 0 && errno == EEXIST)) { | |
1253 | DEBUG("Created device node \"%s\"", path); | |
0bbf8572 CB |
1254 | continue; |
1255 | } | |
1256 | ||
5e73416f CB |
1257 | if (errno != EPERM) { |
1258 | SYSERROR("Failed to create device node \"%s\"", path); | |
9cb4d183 SH |
1259 | return -1; |
1260 | } | |
3999be0a | 1261 | |
5e73416f CB |
1262 | /* This can e.g. happen when the container is |
1263 | * unprivileged or CAP_MKNOD has been dropped. | |
1264 | */ | |
1265 | can_mknod = false; | |
1266 | } | |
1267 | ||
1268 | ret = mknod(path, S_IFREG, 0); | |
1269 | if (ret < 0 && errno != EEXIST) { | |
1270 | SYSERROR("Failed to create file \"%s\"", path); | |
1271 | return -1; | |
1272 | } | |
1273 | ||
1274 | /* Fallback to bind-mounting the device from the host. */ | |
1275 | ret = snprintf(hostpath, MAXPATHLEN, "/dev/%s", device->name); | |
1276 | if (ret < 0 || ret >= MAXPATHLEN) | |
1277 | return -1; | |
1278 | ||
1279 | ret = safe_mount(hostpath, path, 0, MS_BIND, NULL, | |
1280 | rootfs->path ? rootfs->mount : NULL); | |
1281 | if (ret < 0) { | |
1282 | SYSERROR("Failed to bind mount host device node \"%s\" " | |
1283 | "onto \"%s\"", hostpath, path); | |
1284 | return -1; | |
c6883f38 | 1285 | } |
5e73416f CB |
1286 | DEBUG("Bind mounted host device node \"%s\" onto \"%s\"", |
1287 | hostpath, path); | |
c6883f38 | 1288 | } |
5e73416f | 1289 | (void)umask(cmask); |
c6883f38 | 1290 | |
3999be0a | 1291 | INFO("Populated \"/dev\""); |
c6883f38 SH |
1292 | return 0; |
1293 | } | |
1294 | ||
9aa76a17 | 1295 | static int lxc_setup_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1296 | { |
9aa76a17 | 1297 | int ret; |
10bc1861 | 1298 | struct lxc_storage *bdev; |
91c3e281 | 1299 | const struct lxc_rootfs *rootfs; |
cc28d0b0 | 1300 | |
91c3e281 | 1301 | rootfs = &conf->rootfs; |
a0f379bf | 1302 | if (!rootfs->path) { |
0fd73091 CB |
1303 | ret = mount("", "/", NULL, MS_SLAVE | MS_REC, 0); |
1304 | if (ret < 0) { | |
1305 | SYSERROR("Failed to make / rslave"); | |
a0f379bf DW |
1306 | return -1; |
1307 | } | |
0fd73091 | 1308 | |
c69bd12f | 1309 | return 0; |
a0f379bf | 1310 | } |
0ad19a3f | 1311 | |
0fd73091 CB |
1312 | ret = access(rootfs->mount, F_OK); |
1313 | if (ret != 0) { | |
1314 | SYSERROR("Failed to access to \"%s\". Check it is present", | |
12297168 | 1315 | rootfs->mount); |
b1789442 DL |
1316 | return -1; |
1317 | } | |
1318 | ||
8a388ed4 | 1319 | bdev = storage_init(conf); |
9aa76a17 | 1320 | if (!bdev) { |
0fd73091 | 1321 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1322 | rootfs->path, rootfs->mount, |
1323 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1324 | return -1; |
9be53773 | 1325 | } |
9aa76a17 CB |
1326 | |
1327 | ret = bdev->ops->mount(bdev); | |
10bc1861 | 1328 | storage_put(bdev); |
9aa76a17 | 1329 | if (ret < 0) { |
0fd73091 | 1330 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1331 | rootfs->path, rootfs->mount, |
1332 | rootfs->options ? rootfs->options : "(null)"); | |
c3f0a28c | 1333 | return -1; |
1334 | } | |
0ad19a3f | 1335 | |
0fd73091 | 1336 | DEBUG("Mounted rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1337 | rootfs->path, rootfs->mount, |
1338 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1339 | |
ac778708 DL |
1340 | return 0; |
1341 | } | |
1342 | ||
91e93c71 AV |
1343 | int prepare_ramfs_root(char *root) |
1344 | { | |
0fd73091 CB |
1345 | int i, ret; |
1346 | char *p, *p2; | |
1347 | char buf[LXC_LINELEN], nroot[PATH_MAX]; | |
91e93c71 | 1348 | FILE *f; |
91e93c71 | 1349 | |
0fd73091 CB |
1350 | if (!realpath(root, nroot)) |
1351 | return -1; | |
91e93c71 | 1352 | |
0fd73091 CB |
1353 | ret = chdir("/"); |
1354 | if (ret < 0) | |
1355 | return -1; | |
91e93c71 | 1356 | |
0fd73091 CB |
1357 | /* We could use here MS_MOVE, but in userns this mount is locked and |
1358 | * can't be moved. | |
91e93c71 | 1359 | */ |
0fd73091 CB |
1360 | ret = mount(root, "/", NULL, MS_REC | MS_BIND, NULL); |
1361 | if (ret < 0) { | |
1362 | SYSERROR("Failed to move \"%s\" into \"/\"", root); | |
1363 | return -1; | |
91e93c71 AV |
1364 | } |
1365 | ||
0fd73091 CB |
1366 | ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL); |
1367 | if (ret < 0) { | |
1368 | SYSERROR("Failed to make \"/\" rprivate"); | |
1369 | return -1; | |
91e93c71 AV |
1370 | } |
1371 | ||
0fd73091 CB |
1372 | /* The following code cleans up inhereted mounts which are not required |
1373 | * for CT. | |
91e93c71 AV |
1374 | * |
1375 | * The mountinfo file shows not all mounts, if a few points have been | |
1376 | * unmounted between read operations from the mountinfo. So we need to | |
1377 | * read mountinfo a few times. | |
1378 | * | |
1379 | * This loop can be skipped if a container uses unserns, because all | |
1380 | * inherited mounts are locked and we should live with all this trash. | |
1381 | */ | |
0fd73091 | 1382 | for (;;) { |
91e93c71 AV |
1383 | int progress = 0; |
1384 | ||
1385 | f = fopen("./proc/self/mountinfo", "r"); | |
1386 | if (!f) { | |
1387 | SYSERROR("Unable to open /proc/self/mountinfo"); | |
1388 | return -1; | |
1389 | } | |
0fd73091 | 1390 | |
eab15c1e | 1391 | while (fgets(buf, LXC_LINELEN, f)) { |
91e93c71 AV |
1392 | for (p = buf, i=0; p && i < 4; i++) |
1393 | p = strchr(p+1, ' '); | |
0fd73091 | 1394 | |
91e93c71 AV |
1395 | if (!p) |
1396 | continue; | |
0fd73091 | 1397 | |
91e93c71 AV |
1398 | p2 = strchr(p+1, ' '); |
1399 | if (!p2) | |
1400 | continue; | |
1401 | ||
1402 | *p2 = '\0'; | |
1403 | *p = '.'; | |
1404 | ||
1405 | if (strcmp(p + 1, "/") == 0) | |
1406 | continue; | |
0fd73091 | 1407 | |
91e93c71 AV |
1408 | if (strcmp(p + 1, "/proc") == 0) |
1409 | continue; | |
1410 | ||
0fd73091 CB |
1411 | ret = umount2(p, MNT_DETACH); |
1412 | if (ret == 0) | |
91e93c71 AV |
1413 | progress++; |
1414 | } | |
0fd73091 | 1415 | |
91e93c71 | 1416 | fclose(f); |
0fd73091 | 1417 | |
91e93c71 AV |
1418 | if (!progress) |
1419 | break; | |
1420 | } | |
1421 | ||
0fd73091 CB |
1422 | /* This also can be skipped if a container uses unserns. */ |
1423 | (void)umount2("./proc", MNT_DETACH); | |
91e93c71 AV |
1424 | |
1425 | /* It is weird, but chdir("..") moves us in a new root */ | |
0fd73091 CB |
1426 | ret = chdir(".."); |
1427 | if (ret < 0) { | |
91e93c71 AV |
1428 | SYSERROR("Unable to change working directory"); |
1429 | return -1; | |
1430 | } | |
1431 | ||
0fd73091 CB |
1432 | ret = chroot("."); |
1433 | if (ret < 0) { | |
91e93c71 AV |
1434 | SYSERROR("Unable to chroot"); |
1435 | return -1; | |
1436 | } | |
1437 | ||
1438 | return 0; | |
1439 | } | |
1440 | ||
74a3920a | 1441 | static int setup_pivot_root(const struct lxc_rootfs *rootfs) |
ac778708 | 1442 | { |
0fd73091 CB |
1443 | int ret; |
1444 | ||
39c7b795 | 1445 | if (!rootfs->path) { |
0fd73091 | 1446 | DEBUG("Container does not have a rootfs"); |
ac778708 | 1447 | return 0; |
39c7b795 | 1448 | } |
ac778708 | 1449 | |
91e93c71 | 1450 | if (detect_ramfs_rootfs()) { |
0fd73091 CB |
1451 | DEBUG("Detected that container is on ramfs"); |
1452 | ||
1453 | ret = prepare_ramfs_root(rootfs->mount); | |
1454 | if (ret < 0) { | |
1455 | ERROR("Failed to prepare minimal ramfs root"); | |
91e93c71 | 1456 | return -1; |
39c7b795 CB |
1457 | } |
1458 | ||
0fd73091 | 1459 | DEBUG("Prepared ramfs root for container"); |
39c7b795 CB |
1460 | return 0; |
1461 | } | |
1462 | ||
0fd73091 CB |
1463 | ret = setup_rootfs_pivot_root(rootfs->mount); |
1464 | if (ret < 0) { | |
1465 | ERROR("Failed to pivot_root()"); | |
25368b52 | 1466 | return -1; |
c69bd12f DL |
1467 | } |
1468 | ||
0fd73091 | 1469 | DEBUG("Finished pivot_root()"); |
25368b52 | 1470 | return 0; |
0ad19a3f | 1471 | } |
1472 | ||
f4900711 CB |
1473 | static struct id_map *find_mapped_nsid_entry(struct lxc_conf *conf, unsigned id, |
1474 | enum idtype idtype) | |
1475 | { | |
1476 | struct lxc_list *it; | |
1477 | struct id_map *map; | |
1478 | struct id_map *retmap = NULL; | |
1479 | ||
dcf0ffdf CB |
1480 | /* Shortcut for container's root mappings. */ |
1481 | if (id == 0) { | |
1482 | if (idtype == ID_TYPE_UID) | |
1483 | return conf->root_nsuid_map; | |
1484 | ||
1485 | if (idtype == ID_TYPE_GID) | |
1486 | return conf->root_nsgid_map; | |
1487 | } | |
1488 | ||
f4900711 CB |
1489 | lxc_list_for_each(it, &conf->id_map) { |
1490 | map = it->elem; | |
1491 | if (map->idtype != idtype) | |
1492 | continue; | |
1493 | ||
1494 | if (id >= map->nsid && id < map->nsid + map->range) { | |
1495 | retmap = map; | |
1496 | break; | |
1497 | } | |
1498 | } | |
1499 | ||
1500 | return retmap; | |
1501 | } | |
1502 | ||
1503 | static int lxc_setup_devpts(struct lxc_conf *conf) | |
3c26f34e | 1504 | { |
70761e5e | 1505 | int ret; |
f4900711 | 1506 | const char *default_devpts_mntopts; |
9d28c4f9 | 1507 | char devpts_mntopts[256]; |
77890c6d | 1508 | |
f4900711 | 1509 | if (conf->pts <= 0) { |
0fd73091 | 1510 | DEBUG("No new devpts instance will be mounted since no pts " |
70761e5e | 1511 | "devices are requested"); |
d852c78c | 1512 | return 0; |
3c26f34e | 1513 | } |
1514 | ||
f4900711 CB |
1515 | if (!find_mapped_nsid_entry(conf, 5, ID_TYPE_GID)) |
1516 | default_devpts_mntopts = "newinstance,ptmxmode=0666,mode=0620"; | |
1517 | else | |
1518 | default_devpts_mntopts = "newinstance,ptmxmode=0666,mode=0620,gid=5"; | |
1519 | ||
9d28c4f9 | 1520 | ret = snprintf(devpts_mntopts, sizeof(devpts_mntopts), "%s,max=%d", |
f4900711 | 1521 | default_devpts_mntopts, conf->pts); |
9d28c4f9 CB |
1522 | if (ret < 0 || (size_t)ret >= sizeof(devpts_mntopts)) |
1523 | return -1; | |
1524 | ||
d5cb35d6 | 1525 | /* Unmount old devpts instance. */ |
70761e5e CB |
1526 | ret = access("/dev/pts/ptmx", F_OK); |
1527 | if (!ret) { | |
70761e5e CB |
1528 | ret = umount("/dev/pts"); |
1529 | if (ret < 0) { | |
0fd73091 | 1530 | SYSERROR("Failed to unmount old devpts instance"); |
70761e5e | 1531 | return -1; |
7e40254a | 1532 | } |
0fd73091 | 1533 | DEBUG("Unmounted old devpts instance"); |
7e40254a JTLB |
1534 | } |
1535 | ||
70761e5e CB |
1536 | /* Create mountpoint for devpts instance. */ |
1537 | ret = mkdir("/dev/pts", 0755); | |
1538 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1539 | SYSERROR("Failed to create \"/dev/pts\" directory"); |
3c26f34e | 1540 | return -1; |
1541 | } | |
1542 | ||
70761e5e | 1543 | /* Mount new devpts instance. */ |
f4900711 | 1544 | ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, devpts_mntopts); |
70761e5e | 1545 | if (ret < 0) { |
0fd73091 | 1546 | SYSERROR("Failed to mount new devpts instance"); |
70761e5e CB |
1547 | return -1; |
1548 | } | |
0fd73091 | 1549 | DEBUG("Mount new devpts instance with options \"%s\"", devpts_mntopts); |
70761e5e | 1550 | |
d5cb35d6 | 1551 | /* Remove any pre-existing /dev/ptmx file. */ |
70761e5e | 1552 | ret = access("/dev/ptmx", F_OK); |
d5cb35d6 CB |
1553 | if (!ret) { |
1554 | ret = remove("/dev/ptmx"); | |
1555 | if (ret < 0) { | |
0fd73091 | 1556 | SYSERROR("Failed to remove existing \"/dev/ptmx\" file"); |
d5cb35d6 | 1557 | return -1; |
70761e5e | 1558 | } |
0fd73091 | 1559 | DEBUG("Removed existing \"/dev/ptmx\" file"); |
3c26f34e | 1560 | } |
1561 | ||
d5cb35d6 CB |
1562 | /* Create dummy /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
1563 | ret = open("/dev/ptmx", O_CREAT, 0666); | |
1564 | if (ret < 0) { | |
0fd73091 | 1565 | SYSERROR("Failed to create dummy \"/dev/ptmx\" file as bind mount target"); |
d5cb35d6 CB |
1566 | return -1; |
1567 | } | |
e87bd19c | 1568 | close(ret); |
0fd73091 | 1569 | DEBUG("Created dummy \"/dev/ptmx\" file as bind mount target"); |
77890c6d | 1570 | |
d5cb35d6 | 1571 | /* Fallback option: create symlink /dev/ptmx -> /dev/pts/ptmx */ |
e87bd19c | 1572 | ret = mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL); |
d5cb35d6 | 1573 | if (!ret) { |
0fd73091 | 1574 | DEBUG("Bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1575 | return 0; |
1576 | } else { | |
1577 | /* Fallthrough and try to create a symlink. */ | |
0fd73091 | 1578 | ERROR("Failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1579 | } |
1580 | ||
1581 | /* Remove the dummy /dev/ptmx file we created above. */ | |
1582 | ret = remove("/dev/ptmx"); | |
70761e5e | 1583 | if (ret < 0) { |
0fd73091 | 1584 | SYSERROR("Failed to remove existing \"/dev/ptmx\""); |
d5cb35d6 CB |
1585 | return -1; |
1586 | } | |
1587 | ||
1588 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
1589 | ret = symlink("/dev/pts/ptmx", "/dev/ptmx"); | |
1590 | if (ret < 0) { | |
0fd73091 | 1591 | SYSERROR("Failed to create symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
3c26f34e | 1592 | return -1; |
1593 | } | |
0fd73091 | 1594 | DEBUG("Created symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
cd54d859 | 1595 | |
3c26f34e | 1596 | return 0; |
1597 | } | |
1598 | ||
cccc74b5 DL |
1599 | static int setup_personality(int persona) |
1600 | { | |
0fd73091 CB |
1601 | int ret; |
1602 | ||
1603 | #if HAVE_SYS_PERSONALITY_H | |
cccc74b5 DL |
1604 | if (persona == -1) |
1605 | return 0; | |
1606 | ||
0fd73091 CB |
1607 | ret = personality(persona); |
1608 | if (ret < 0) { | |
1609 | SYSERROR("Failed to set personality to \"0x%x\"", persona); | |
cccc74b5 DL |
1610 | return -1; |
1611 | } | |
1612 | ||
0fd73091 CB |
1613 | INFO("Set personality to \"0x%x\"", persona); |
1614 | #endif | |
cccc74b5 DL |
1615 | |
1616 | return 0; | |
1617 | } | |
1618 | ||
3d7d929a | 1619 | static int lxc_setup_dev_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1620 | const struct lxc_terminal *console) |
6e590161 | 1621 | { |
0fd73091 | 1622 | int fd, ret; |
63376d7d | 1623 | char path[MAXPATHLEN]; |
86530b0a | 1624 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
52e35957 | 1625 | |
8b1b1210 CB |
1626 | if (console->path && !strcmp(console->path, "none")) |
1627 | return 0; | |
1628 | ||
86530b0a | 1629 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3d7d929a | 1630 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1631 | return -1; |
52e35957 | 1632 | |
8b1b1210 CB |
1633 | /* When we are asked to setup a console we remove any previous |
1634 | * /dev/console bind-mounts. | |
1635 | */ | |
a7ba3c7f CB |
1636 | if (file_exists(path)) { |
1637 | ret = lxc_unstack_mountpoint(path, false); | |
1638 | if (ret < 0) { | |
86530b0a | 1639 | ERROR("Failed to unmount \"%s\": %s", path, strerror(errno)); |
a7ba3c7f CB |
1640 | return -ret; |
1641 | } else { | |
86530b0a | 1642 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1643 | } |
8b1b1210 CB |
1644 | } |
1645 | ||
1646 | /* For unprivileged containers autodev or automounts will already have | |
1647 | * taken care of creating /dev/console. | |
1648 | */ | |
0728ebf4 TA |
1649 | fd = open(path, O_CREAT | O_EXCL, S_IXUSR | S_IXGRP | S_IXOTH); |
1650 | if (fd < 0) { | |
1651 | if (errno != EEXIST) { | |
86530b0a | 1652 | SYSERROR("Failed to create console"); |
3d7d929a | 1653 | return -errno; |
0728ebf4 TA |
1654 | } |
1655 | } else { | |
1656 | close(fd); | |
52e35957 DL |
1657 | } |
1658 | ||
86530b0a L |
1659 | ret = chmod(console->name, S_IXUSR | S_IXGRP | S_IXOTH); |
1660 | if (ret < 0) { | |
0fd73091 CB |
1661 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
1662 | S_IXUSR | S_IXGRP | S_IXOTH, console->name); | |
3d7d929a | 1663 | return -errno; |
63376d7d | 1664 | } |
13954cce | 1665 | |
86530b0a L |
1666 | ret = safe_mount(console->name, path, "none", MS_BIND, 0, rootfs_path); |
1667 | if (ret < 0) { | |
0fd73091 | 1668 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, path); |
6e590161 | 1669 | return -1; |
1670 | } | |
1671 | ||
86530b0a | 1672 | DEBUG("Mounted pts device \"%s\" onto \"%s\"", console->name, path); |
7c6ef2a2 SH |
1673 | return 0; |
1674 | } | |
1675 | ||
3d7d929a | 1676 | static int lxc_setup_ttydir_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1677 | const struct lxc_terminal *console, |
3d7d929a | 1678 | char *ttydir) |
7c6ef2a2 | 1679 | { |
3dc035f1 | 1680 | int ret, fd; |
3d7d929a | 1681 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
86530b0a | 1682 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
7c6ef2a2 | 1683 | |
3dc035f1 L |
1684 | if (console->path && !strcmp(console->path, "none")) |
1685 | return 0; | |
1686 | ||
7c6ef2a2 | 1687 | /* create rootfs/dev/<ttydir> directory */ |
86530b0a | 1688 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs_path, ttydir); |
3d7d929a | 1689 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1690 | return -1; |
3d7d929a | 1691 | |
7c6ef2a2 SH |
1692 | ret = mkdir(path, 0755); |
1693 | if (ret && errno != EEXIST) { | |
0fd73091 | 1694 | SYSERROR("Failed to create \"%s\"", path); |
3d7d929a | 1695 | return -errno; |
7c6ef2a2 | 1696 | } |
4742cd9a | 1697 | DEBUG("Created directory for console and tty devices at \"%s\"", path); |
7c6ef2a2 | 1698 | |
86530b0a | 1699 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", rootfs_path, ttydir); |
3d7d929a CB |
1700 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
1701 | return -1; | |
1702 | ||
7c6ef2a2 | 1703 | ret = creat(lxcpath, 0660); |
3d7d929a | 1704 | if (ret == -1 && errno != EEXIST) { |
0fd73091 | 1705 | SYSERROR("Failed to create \"%s\"", lxcpath); |
3d7d929a | 1706 | return -errno; |
7c6ef2a2 | 1707 | } |
4d44e274 SH |
1708 | if (ret >= 0) |
1709 | close(ret); | |
7c6ef2a2 | 1710 | |
86530b0a | 1711 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3dc035f1 | 1712 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1713 | return -1; |
2a12fefd | 1714 | |
3dc035f1 | 1715 | if (file_exists(path)) { |
a7ba3c7f | 1716 | ret = lxc_unstack_mountpoint(path, false); |
2a12fefd | 1717 | if (ret < 0) { |
0fd73091 | 1718 | ERROR("%s - Failed to unmount \"%s\"", strerror(errno), path); |
a7ba3c7f CB |
1719 | return -ret; |
1720 | } else { | |
86530b0a | 1721 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1722 | } |
3dc035f1 | 1723 | } |
2a12fefd | 1724 | |
3dc035f1 L |
1725 | fd = open(path, O_CREAT | O_EXCL, S_IXUSR | S_IXGRP | S_IXOTH); |
1726 | if (fd < 0) { | |
1727 | if (errno != EEXIST) { | |
86530b0a | 1728 | SYSERROR("Failed to create console"); |
3dc035f1 | 1729 | return -errno; |
2a12fefd | 1730 | } |
3dc035f1 L |
1731 | } else { |
1732 | close(fd); | |
7c6ef2a2 SH |
1733 | } |
1734 | ||
86530b0a L |
1735 | ret = chmod(console->name, S_IXUSR | S_IXGRP | S_IXOTH); |
1736 | if (ret < 0) { | |
0fd73091 CB |
1737 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
1738 | S_IXUSR | S_IXGRP | S_IXOTH, console->name); | |
2a12fefd CB |
1739 | return -errno; |
1740 | } | |
1741 | ||
3dc035f1 | 1742 | /* bind mount console->name to '/dev/<ttydir>/console' */ |
86530b0a L |
1743 | ret = safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs_path); |
1744 | if (ret < 0) { | |
0fd73091 | 1745 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
7c6ef2a2 SH |
1746 | return -1; |
1747 | } | |
86530b0a | 1748 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1749 | |
1750 | /* bind mount '/dev/<ttydir>/console' to '/dev/console' */ | |
86530b0a L |
1751 | ret = safe_mount(lxcpath, path, "none", MS_BIND, 0, rootfs_path); |
1752 | if (ret < 0) { | |
0fd73091 | 1753 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1754 | return -1; |
1755 | } | |
86530b0a | 1756 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 | 1757 | |
86530b0a | 1758 | DEBUG("Console has been setup under \"%s\" and mounted to \"%s\"", lxcpath, path); |
6e590161 | 1759 | return 0; |
1760 | } | |
1761 | ||
3d7d929a | 1762 | static int lxc_setup_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1763 | const struct lxc_terminal *console, char *ttydir) |
7c6ef2a2 | 1764 | { |
3d7d929a | 1765 | |
7c6ef2a2 | 1766 | if (!ttydir) |
3d7d929a | 1767 | return lxc_setup_dev_console(rootfs, console); |
7c6ef2a2 | 1768 | |
3d7d929a | 1769 | return lxc_setup_ttydir_console(rootfs, console, ttydir); |
7c6ef2a2 SH |
1770 | } |
1771 | ||
998ac676 RT |
1772 | static void parse_mntopt(char *opt, unsigned long *flags, char **data) |
1773 | { | |
1774 | struct mount_opt *mo; | |
1775 | ||
1776 | /* If opt is found in mount_opt, set or clear flags. | |
1777 | * Otherwise append it to data. */ | |
1778 | ||
1779 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
0fd73091 | 1780 | if (strncmp(opt, mo->name, strlen(mo->name)) == 0) { |
998ac676 RT |
1781 | if (mo->clear) |
1782 | *flags &= ~mo->flag; | |
1783 | else | |
1784 | *flags |= mo->flag; | |
1785 | return; | |
1786 | } | |
1787 | } | |
1788 | ||
1789 | if (strlen(*data)) | |
1790 | strcat(*data, ","); | |
1791 | strcat(*data, opt); | |
1792 | } | |
1793 | ||
0fd73091 | 1794 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, char **mntdata) |
998ac676 | 1795 | { |
0fd73091 CB |
1796 | char *data, *p, *s; |
1797 | char *saveptr = NULL; | |
998ac676 | 1798 | |
911324ef | 1799 | *mntdata = NULL; |
91656ce5 | 1800 | *mntflags = 0L; |
911324ef DL |
1801 | |
1802 | if (!mntopts) | |
998ac676 RT |
1803 | return 0; |
1804 | ||
911324ef | 1805 | s = strdup(mntopts); |
0fd73091 | 1806 | if (!s) |
998ac676 | 1807 | return -1; |
998ac676 RT |
1808 | |
1809 | data = malloc(strlen(s) + 1); | |
1810 | if (!data) { | |
998ac676 RT |
1811 | free(s); |
1812 | return -1; | |
1813 | } | |
1814 | *data = 0; | |
1815 | ||
0fd73091 | 1816 | for (; (p = strtok_r(s, ",", &saveptr)); s = NULL) |
998ac676 RT |
1817 | parse_mntopt(p, mntflags, &data); |
1818 | ||
1819 | if (*data) | |
1820 | *mntdata = data; | |
1821 | else | |
1822 | free(data); | |
1823 | free(s); | |
1824 | ||
1825 | return 0; | |
1826 | } | |
1827 | ||
d840039e YT |
1828 | static void parse_propagationopt(char *opt, unsigned long *flags) |
1829 | { | |
1830 | struct mount_opt *mo; | |
1831 | ||
1832 | /* If opt is found in propagation_opt, set or clear flags. */ | |
d840039e | 1833 | for (mo = &propagation_opt[0]; mo->name != NULL; mo++) { |
0fd73091 CB |
1834 | if (strncmp(opt, mo->name, strlen(mo->name)) != 0) |
1835 | continue; | |
1836 | ||
1837 | if (mo->clear) | |
1838 | *flags &= ~mo->flag; | |
1839 | else | |
1840 | *flags |= mo->flag; | |
1841 | ||
1842 | return; | |
d840039e YT |
1843 | } |
1844 | } | |
1845 | ||
1846 | static int parse_propagationopts(const char *mntopts, unsigned long *pflags) | |
1847 | { | |
0fd73091 CB |
1848 | char *p, *s; |
1849 | char *saveptr = NULL; | |
d840039e YT |
1850 | |
1851 | if (!mntopts) | |
1852 | return 0; | |
1853 | ||
1854 | s = strdup(mntopts); | |
1855 | if (!s) { | |
1856 | SYSERROR("Failed to allocate memory"); | |
1857 | return -ENOMEM; | |
1858 | } | |
1859 | ||
0fd73091 CB |
1860 | *pflags = 0L; |
1861 | for (; (p = strtok_r(s, ",", &saveptr)); s = NULL) | |
d840039e | 1862 | parse_propagationopt(p, pflags); |
d840039e | 1863 | free(s); |
0fd73091 | 1864 | |
d840039e YT |
1865 | return 0; |
1866 | } | |
1867 | ||
6fd5e769 SH |
1868 | static void null_endofword(char *word) |
1869 | { | |
1870 | while (*word && *word != ' ' && *word != '\t') | |
1871 | word++; | |
1872 | *word = '\0'; | |
1873 | } | |
1874 | ||
0fd73091 | 1875 | /* skip @nfields spaces in @src */ |
6fd5e769 SH |
1876 | static char *get_field(char *src, int nfields) |
1877 | { | |
6fd5e769 | 1878 | int i; |
0fd73091 | 1879 | char *p = src; |
6fd5e769 SH |
1880 | |
1881 | for (i = 0; i < nfields; i++) { | |
1882 | while (*p && *p != ' ' && *p != '\t') | |
1883 | p++; | |
0fd73091 | 1884 | |
6fd5e769 SH |
1885 | if (!*p) |
1886 | break; | |
0fd73091 | 1887 | |
6fd5e769 SH |
1888 | p++; |
1889 | } | |
0fd73091 | 1890 | |
6fd5e769 SH |
1891 | return p; |
1892 | } | |
1893 | ||
911324ef DL |
1894 | static int mount_entry(const char *fsname, const char *target, |
1895 | const char *fstype, unsigned long mountflags, | |
d840039e YT |
1896 | unsigned long pflags, const char *data, bool optional, |
1897 | bool dev, bool relative, const char *rootfs) | |
911324ef | 1898 | { |
0ac4b28a | 1899 | int ret; |
181437fd YT |
1900 | char srcbuf[MAXPATHLEN]; |
1901 | const char *srcpath = fsname; | |
614305f3 | 1902 | #ifdef HAVE_STATVFS |
2938f7c8 | 1903 | struct statvfs sb; |
614305f3 | 1904 | #endif |
2938f7c8 | 1905 | |
181437fd YT |
1906 | if (relative) { |
1907 | ret = snprintf(srcbuf, MAXPATHLEN, "%s/%s", rootfs ? rootfs : "/", fsname ? fsname : ""); | |
1908 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1909 | ERROR("source path is too long"); | |
1910 | return -1; | |
1911 | } | |
1912 | srcpath = srcbuf; | |
1913 | } | |
1914 | ||
1915 | ret = safe_mount(srcpath, target, fstype, mountflags & ~MS_REMOUNT, data, | |
0ac4b28a CB |
1916 | rootfs); |
1917 | if (ret < 0) { | |
1fc64d22 | 1918 | if (optional) { |
0fd73091 CB |
1919 | INFO("%s - Failed to mount \"%s\" on \"%s\" " |
1920 | "(optional)", strerror(errno), | |
1921 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
1922 | return 0; |
1923 | } | |
0ac4b28a | 1924 | |
0103eb53 | 1925 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 1926 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 1927 | return -1; |
911324ef DL |
1928 | } |
1929 | ||
1930 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
7c5b6e7c | 1931 | unsigned long rqd_flags = 0; |
0ac4b28a CB |
1932 | |
1933 | DEBUG("Remounting \"%s\" on \"%s\" to respect bind or remount " | |
181437fd | 1934 | "options", srcpath ? srcpath : "(none)", target ? target : "(none)"); |
0ac4b28a | 1935 | |
7c5b6e7c AS |
1936 | if (mountflags & MS_RDONLY) |
1937 | rqd_flags |= MS_RDONLY; | |
614305f3 | 1938 | #ifdef HAVE_STATVFS |
181437fd | 1939 | if (srcpath && statvfs(srcpath, &sb) == 0) { |
7c5b6e7c | 1940 | unsigned long required_flags = rqd_flags; |
0ac4b28a | 1941 | |
2938f7c8 SH |
1942 | if (sb.f_flag & MS_NOSUID) |
1943 | required_flags |= MS_NOSUID; | |
0ac4b28a | 1944 | |
ae7a770e | 1945 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 | 1946 | required_flags |= MS_NODEV; |
0ac4b28a | 1947 | |
2938f7c8 SH |
1948 | if (sb.f_flag & MS_RDONLY) |
1949 | required_flags |= MS_RDONLY; | |
0ac4b28a | 1950 | |
2938f7c8 SH |
1951 | if (sb.f_flag & MS_NOEXEC) |
1952 | required_flags |= MS_NOEXEC; | |
0ac4b28a CB |
1953 | |
1954 | DEBUG("Flags for \"%s\" were %lu, required extra flags " | |
181437fd | 1955 | "are %lu", srcpath, sb.f_flag, required_flags); |
0ac4b28a CB |
1956 | |
1957 | /* If this was a bind mount request, and required_flags | |
2938f7c8 | 1958 | * does not have any flags which are not already in |
0ac4b28a | 1959 | * mountflags, then skip the remount. |
2938f7c8 SH |
1960 | */ |
1961 | if (!(mountflags & MS_REMOUNT)) { | |
0ac4b28a CB |
1962 | if (!(required_flags & ~mountflags) && |
1963 | rqd_flags == 0) { | |
1964 | DEBUG("Mountflags already were %lu, " | |
1965 | "skipping remount", mountflags); | |
2938f7c8 SH |
1966 | goto skipremount; |
1967 | } | |
1968 | } | |
0ac4b28a | 1969 | |
2938f7c8 | 1970 | mountflags |= required_flags; |
6fd5e769 | 1971 | } |
614305f3 | 1972 | #endif |
911324ef | 1973 | |
181437fd | 1974 | ret = mount(srcpath, target, fstype, mountflags | MS_REMOUNT, data); |
0ac4b28a | 1975 | if (ret < 0) { |
1fc64d22 | 1976 | if (optional) { |
0ac4b28a | 1977 | INFO("Failed to mount \"%s\" on \"%s\" " |
0103eb53 | 1978 | "(optional): %s", |
181437fd | 1979 | srcpath ? srcpath : "(null)", target, |
0ac4b28a | 1980 | strerror(errno)); |
1fc64d22 SG |
1981 | return 0; |
1982 | } | |
0ac4b28a | 1983 | |
0103eb53 | 1984 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 1985 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 1986 | return -1; |
911324ef DL |
1987 | } |
1988 | } | |
1989 | ||
d840039e YT |
1990 | if (pflags) { |
1991 | ret = mount(NULL, target, NULL, pflags, NULL); | |
1992 | if (ret < 0) { | |
1993 | if (optional) { | |
1994 | INFO("%s - Failed to change mount propagation " | |
1995 | "for \"%s\" (optional)", strerror(errno), target); | |
1996 | return 0; | |
1997 | } else { | |
1998 | SYSERROR("Failed to change mount propagation " | |
1999 | "for \"%s\" (optional)", target); | |
2000 | return -1; | |
2001 | } | |
2002 | } | |
2003 | DEBUG("Changed mount propagation for \"%s\"", target); | |
2004 | } | |
2005 | ||
2006 | ||
614305f3 | 2007 | #ifdef HAVE_STATVFS |
6fd5e769 | 2008 | skipremount: |
614305f3 | 2009 | #endif |
0103eb53 | 2010 | DEBUG("Mounted \"%s\" on \"%s\" with filesystem type \"%s\"", |
181437fd | 2011 | srcpath ? srcpath : "(null)", target, fstype); |
911324ef DL |
2012 | |
2013 | return 0; | |
2014 | } | |
2015 | ||
c5e30de4 | 2016 | /* Remove "optional", "create=dir", and "create=file" from mntopt */ |
4e4ca161 SH |
2017 | static void cull_mntent_opt(struct mntent *mntent) |
2018 | { | |
2019 | int i; | |
0fd73091 CB |
2020 | char *list[] = { |
2021 | "create=dir", | |
2022 | "create=file", | |
2023 | "optional", | |
2024 | "relative", | |
2025 | NULL | |
2026 | }; | |
c5e30de4 CB |
2027 | |
2028 | for (i = 0; list[i]; i++) { | |
2029 | char *p, *p2; | |
2030 | ||
2031 | p = strstr(mntent->mnt_opts, list[i]); | |
2032 | if (!p) | |
4e4ca161 | 2033 | continue; |
c5e30de4 | 2034 | |
4e4ca161 SH |
2035 | p2 = strchr(p, ','); |
2036 | if (!p2) { | |
2037 | /* no more mntopts, so just chop it here */ | |
2038 | *p = '\0'; | |
2039 | continue; | |
2040 | } | |
c5e30de4 CB |
2041 | |
2042 | memmove(p, p2 + 1, strlen(p2 + 1) + 1); | |
4e4ca161 SH |
2043 | } |
2044 | } | |
2045 | ||
4d5b72a1 | 2046 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
749f98d9 CB |
2047 | const char *path, |
2048 | const struct lxc_rootfs *rootfs, | |
0fd73091 | 2049 | const char *lxc_name, const char *lxc_path) |
0ad19a3f | 2050 | { |
12e6ab5d CB |
2051 | int fd, ret; |
2052 | char *p1, *p2; | |
911324ef | 2053 | |
12e6ab5d | 2054 | if (strncmp(mntent->mnt_type, "overlay", 7) == 0) { |
749f98d9 | 2055 | ret = ovl_mkdir(mntent, rootfs, lxc_name, lxc_path); |
12e6ab5d CB |
2056 | if (ret < 0) |
2057 | return -1; | |
2058 | } | |
6e46cc0d | 2059 | |
34cfffb3 | 2060 | if (hasmntopt(mntent, "create=dir")) { |
749f98d9 CB |
2061 | ret = mkdir_p(path, 0755); |
2062 | if (ret < 0 && errno != EEXIST) { | |
2063 | SYSERROR("Failed to create directory \"%s\"", path); | |
2064 | return -1; | |
34cfffb3 SG |
2065 | } |
2066 | } | |
2067 | ||
0fd73091 CB |
2068 | if (!hasmntopt(mntent, "create=file")) |
2069 | return 0; | |
749f98d9 | 2070 | |
0fd73091 CB |
2071 | ret = access(path, F_OK); |
2072 | if (ret == 0) | |
2073 | return 0; | |
749f98d9 | 2074 | |
0fd73091 CB |
2075 | p1 = strdup(path); |
2076 | if (!p1) | |
2077 | return -1; | |
749f98d9 | 2078 | |
0fd73091 | 2079 | p2 = dirname(p1); |
749f98d9 | 2080 | |
0fd73091 CB |
2081 | ret = mkdir_p(p2, 0755); |
2082 | free(p1); | |
2083 | if (ret < 0 && errno != EEXIST) { | |
2084 | SYSERROR("Failed to create directory \"%s\"", path); | |
2085 | return -1; | |
34cfffb3 | 2086 | } |
749f98d9 | 2087 | |
0fd73091 CB |
2088 | fd = open(path, O_CREAT, 0644); |
2089 | if (fd < 0) | |
2090 | return -1; | |
2091 | close(fd); | |
2092 | ||
749f98d9 | 2093 | return 0; |
4d5b72a1 NC |
2094 | } |
2095 | ||
ec50007f CB |
2096 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
2097 | * without a rootfs. */ | |
db4aba38 | 2098 | static inline int mount_entry_on_generic(struct mntent *mntent, |
d8b712bc CB |
2099 | const char *path, |
2100 | const struct lxc_rootfs *rootfs, | |
2101 | const char *lxc_name, | |
2102 | const char *lxc_path) | |
4d5b72a1 | 2103 | { |
d8b712bc | 2104 | int ret; |
949d0338 | 2105 | unsigned long mntflags; |
4d5b72a1 | 2106 | char *mntdata; |
181437fd | 2107 | bool dev, optional, relative; |
949d0338 | 2108 | unsigned long pflags = 0; |
ec50007f | 2109 | char *rootfs_path = NULL; |
d8b712bc CB |
2110 | |
2111 | optional = hasmntopt(mntent, "optional") != NULL; | |
2112 | dev = hasmntopt(mntent, "dev") != NULL; | |
181437fd | 2113 | relative = hasmntopt(mntent, "relative") != NULL; |
d8b712bc | 2114 | |
ec50007f CB |
2115 | if (rootfs && rootfs->path) |
2116 | rootfs_path = rootfs->mount; | |
2117 | ||
d8b712bc CB |
2118 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, |
2119 | lxc_path); | |
2120 | if (ret < 0) { | |
2121 | if (optional) | |
2122 | return 0; | |
608e3567 | 2123 | |
d8b712bc CB |
2124 | return -1; |
2125 | } | |
4e4ca161 SH |
2126 | cull_mntent_opt(mntent); |
2127 | ||
d840039e YT |
2128 | ret = parse_propagationopts(mntent->mnt_opts, &pflags); |
2129 | if (ret < 0) | |
2130 | return -1; | |
2131 | ||
d8b712bc CB |
2132 | ret = parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata); |
2133 | if (ret < 0) | |
a17b1e65 | 2134 | return -1; |
a17b1e65 | 2135 | |
6e46cc0d | 2136 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
d840039e | 2137 | pflags, mntdata, optional, dev, relative, rootfs_path); |
68c152ef | 2138 | |
911324ef | 2139 | free(mntdata); |
911324ef DL |
2140 | return ret; |
2141 | } | |
2142 | ||
db4aba38 NC |
2143 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
2144 | { | |
1433c9f9 | 2145 | int ret; |
07667a6a | 2146 | char path[MAXPATHLEN]; |
1433c9f9 CB |
2147 | |
2148 | /* For containers created without a rootfs all mounts are treated as | |
07667a6a CB |
2149 | * absolute paths starting at / on the host. |
2150 | */ | |
1433c9f9 CB |
2151 | if (mntent->mnt_dir[0] != '/') |
2152 | ret = snprintf(path, sizeof(path), "/%s", mntent->mnt_dir); | |
2153 | else | |
2154 | ret = snprintf(path, sizeof(path), "%s", mntent->mnt_dir); | |
07667a6a | 2155 | if (ret < 0 || ret >= sizeof(path)) |
1433c9f9 | 2156 | return -1; |
1433c9f9 CB |
2157 | |
2158 | return mount_entry_on_generic(mntent, path, NULL, NULL, NULL); | |
db4aba38 NC |
2159 | } |
2160 | ||
4e4ca161 | 2161 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 | 2162 | const struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2163 | const char *lxc_name, |
2164 | const char *lxc_path) | |
911324ef | 2165 | { |
bdd2b34c | 2166 | int offset; |
013bd428 | 2167 | char *aux; |
67e571de | 2168 | const char *lxcpath; |
bdd2b34c CB |
2169 | char path[MAXPATHLEN]; |
2170 | int ret = 0; | |
0ad19a3f | 2171 | |
593e8478 | 2172 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
bdd2b34c | 2173 | if (!lxcpath) |
2a59a681 | 2174 | return -1; |
2a59a681 | 2175 | |
bdd2b34c CB |
2176 | /* If rootfs->path is a blockdev path, allow container fstab to use |
2177 | * <lxcpath>/<name>/rootfs" as the target prefix. | |
2178 | */ | |
2179 | ret = snprintf(path, MAXPATHLEN, "%s/%s/rootfs", lxcpath, lxc_name); | |
2180 | if (ret < 0 || ret >= MAXPATHLEN) | |
80a881b2 SH |
2181 | goto skipvarlib; |
2182 | ||
2183 | aux = strstr(mntent->mnt_dir, path); | |
2184 | if (aux) { | |
2185 | offset = strlen(path); | |
2186 | goto skipabs; | |
2187 | } | |
2188 | ||
2189 | skipvarlib: | |
013bd428 DL |
2190 | aux = strstr(mntent->mnt_dir, rootfs->path); |
2191 | if (!aux) { | |
bdd2b34c | 2192 | WARN("Ignoring mount point \"%s\"", mntent->mnt_dir); |
db4aba38 | 2193 | return ret; |
013bd428 | 2194 | } |
80a881b2 SH |
2195 | offset = strlen(rootfs->path); |
2196 | ||
2197 | skipabs: | |
bdd2b34c CB |
2198 | ret = snprintf(path, MAXPATHLEN, "%s/%s", rootfs->mount, aux + offset); |
2199 | if (ret < 0 || ret >= MAXPATHLEN) | |
a17b1e65 | 2200 | return -1; |
a17b1e65 | 2201 | |
0a2dddd4 | 2202 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef | 2203 | } |
d330fe7b | 2204 | |
4e4ca161 | 2205 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
0a2dddd4 CB |
2206 | const struct lxc_rootfs *rootfs, |
2207 | const char *lxc_name, | |
2208 | const char *lxc_path) | |
911324ef | 2209 | { |
911324ef | 2210 | int ret; |
0fd73091 | 2211 | char path[MAXPATHLEN]; |
d330fe7b | 2212 | |
34cfffb3 | 2213 | /* relative to root mount point */ |
6e46cc0d | 2214 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs->mount, mntent->mnt_dir); |
0fd73091 | 2215 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
9ba8130c | 2216 | return -1; |
911324ef | 2217 | |
0a2dddd4 | 2218 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef DL |
2219 | } |
2220 | ||
06749971 CB |
2221 | static int mount_file_entries(const struct lxc_conf *conf, |
2222 | const struct lxc_rootfs *rootfs, FILE *file, | |
1ae3c19f | 2223 | const char *lxc_name, const char *lxc_path) |
911324ef | 2224 | { |
aaf901be | 2225 | char buf[4096]; |
0fd73091 | 2226 | struct mntent mntent; |
911324ef | 2227 | int ret = -1; |
e76b8764 | 2228 | |
aaf901be | 2229 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
1ae3c19f CB |
2230 | if (!rootfs->path) |
2231 | ret = mount_entry_on_systemfs(&mntent); | |
2232 | else if (mntent.mnt_dir[0] != '/') | |
2233 | ret = mount_entry_on_relative_rootfs(&mntent, rootfs, | |
2234 | lxc_name, lxc_path); | |
2235 | else | |
2236 | ret = mount_entry_on_absolute_rootfs(&mntent, rootfs, | |
2237 | lxc_name, lxc_path); | |
2238 | if (ret < 0) | |
2239 | return -1; | |
0ad19a3f | 2240 | } |
2241 | ret = 0; | |
cd54d859 | 2242 | |
0fd73091 | 2243 | INFO("Finished setting up mounts"); |
e7938e9e MN |
2244 | return ret; |
2245 | } | |
2246 | ||
06749971 CB |
2247 | static int setup_mount(const struct lxc_conf *conf, |
2248 | const struct lxc_rootfs *rootfs, const char *fstab, | |
42dff448 | 2249 | const char *lxc_name, const char *lxc_path) |
e7938e9e | 2250 | { |
42dff448 | 2251 | FILE *f; |
e7938e9e MN |
2252 | int ret; |
2253 | ||
2254 | if (!fstab) | |
2255 | return 0; | |
2256 | ||
42dff448 CB |
2257 | f = setmntent(fstab, "r"); |
2258 | if (!f) { | |
2259 | SYSERROR("Failed to open \"%s\"", fstab); | |
e7938e9e MN |
2260 | return -1; |
2261 | } | |
2262 | ||
06749971 | 2263 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
42dff448 CB |
2264 | if (ret < 0) |
2265 | ERROR("Failed to set up mount entries"); | |
e7938e9e | 2266 | |
42dff448 | 2267 | endmntent(f); |
0ad19a3f | 2268 | return ret; |
2269 | } | |
2270 | ||
5ef5c9a3 | 2271 | FILE *make_anonymous_mount_file(struct lxc_list *mount) |
e7938e9e | 2272 | { |
5ef5c9a3 | 2273 | int ret; |
e7938e9e | 2274 | char *mount_entry; |
5ef5c9a3 | 2275 | struct lxc_list *iterator; |
5ef5c9a3 CB |
2276 | int fd = -1; |
2277 | ||
0fd73091 | 2278 | fd = memfd_create(".lxc_mount_file", MFD_CLOEXEC); |
5ef5c9a3 CB |
2279 | if (fd < 0) { |
2280 | if (errno != ENOSYS) | |
2281 | return NULL; | |
0fd73091 CB |
2282 | fd = lxc_make_tmpfile((char *){P_tmpdir "/.lxc_mount_file"}, true); |
2283 | if (fd < 0) { | |
2284 | SYSERROR("Could not create temporary mount file"); | |
2285 | return NULL; | |
2286 | } | |
2287 | ||
6bd04140 | 2288 | TRACE("Created temporary mount file"); |
5ef5c9a3 | 2289 | } |
0fd73091 CB |
2290 | if (fd < 0) { |
2291 | SYSERROR("Could not create temporary mount file"); | |
9fc7f8c0 | 2292 | return NULL; |
e7938e9e MN |
2293 | } |
2294 | ||
0fd73091 CB |
2295 | lxc_list_for_each (iterator, mount) { |
2296 | size_t len; | |
2297 | ||
e7938e9e | 2298 | mount_entry = iterator->elem; |
0fd73091 | 2299 | len = strlen(mount_entry); |
5ef5c9a3 | 2300 | |
0fd73091 CB |
2301 | ret = write(fd, mount_entry, len); |
2302 | if (ret != len) | |
2303 | goto on_error; | |
2304 | ||
2305 | ret = write(fd, "\n", 1); | |
2306 | if (ret != 1) | |
2307 | goto on_error; | |
e7938e9e MN |
2308 | } |
2309 | ||
0fd73091 CB |
2310 | ret = lseek(fd, 0, SEEK_SET); |
2311 | if (ret < 0) | |
2312 | goto on_error; | |
2313 | ||
2314 | return fdopen(fd, "r+"); | |
2315 | ||
2316 | on_error: | |
2317 | SYSERROR("Failed to write mount entry to temporary mount file"); | |
2318 | close(fd); | |
2319 | return NULL; | |
9fc7f8c0 TA |
2320 | } |
2321 | ||
06749971 CB |
2322 | static int setup_mount_entries(const struct lxc_conf *conf, |
2323 | const struct lxc_rootfs *rootfs, | |
5ef5c9a3 CB |
2324 | struct lxc_list *mount, const char *lxc_name, |
2325 | const char *lxc_path) | |
9fc7f8c0 | 2326 | { |
9fc7f8c0 | 2327 | int ret; |
0fd73091 | 2328 | FILE *f; |
9fc7f8c0 | 2329 | |
19b5d755 CB |
2330 | f = make_anonymous_mount_file(mount); |
2331 | if (!f) | |
9fc7f8c0 | 2332 | return -1; |
e7938e9e | 2333 | |
06749971 | 2334 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
19b5d755 | 2335 | fclose(f); |
0fd73091 | 2336 | |
e7938e9e MN |
2337 | return ret; |
2338 | } | |
2339 | ||
bab88e68 CS |
2340 | static int parse_cap(const char *cap) |
2341 | { | |
84760c11 | 2342 | size_t i; |
2343 | int capid = -1; | |
0fd73091 CB |
2344 | size_t end = sizeof(caps_opt) / sizeof(caps_opt[0]); |
2345 | char *ptr = NULL; | |
bab88e68 | 2346 | |
0fd73091 | 2347 | if (strcmp(cap, "none") == 0) |
7035407c DE |
2348 | return -2; |
2349 | ||
8560cd36 | 2350 | for (i = 0; i < end; i++) { |
bab88e68 CS |
2351 | if (strcmp(cap, caps_opt[i].name)) |
2352 | continue; | |
2353 | ||
2354 | capid = caps_opt[i].value; | |
2355 | break; | |
2356 | } | |
2357 | ||
2358 | if (capid < 0) { | |
0fd73091 CB |
2359 | /* Try to see if it's numeric, so the user may specify |
2360 | * capabilities that the running kernel knows about but we | |
2361 | * don't | |
2362 | */ | |
bab88e68 CS |
2363 | errno = 0; |
2364 | capid = strtol(cap, &ptr, 10); | |
2365 | if (!ptr || *ptr != '\0' || errno != 0) | |
2366 | /* not a valid number */ | |
2367 | capid = -1; | |
2368 | else if (capid > lxc_caps_last_cap()) | |
2369 | /* we have a number but it's not a valid | |
2370 | * capability */ | |
2371 | capid = -1; | |
2372 | } | |
2373 | ||
2374 | return capid; | |
2375 | } | |
2376 | ||
0769b82a CS |
2377 | int in_caplist(int cap, struct lxc_list *caps) |
2378 | { | |
0769b82a | 2379 | int capid; |
0fd73091 | 2380 | struct lxc_list *iterator; |
0769b82a | 2381 | |
0fd73091 | 2382 | lxc_list_for_each (iterator, caps) { |
0769b82a CS |
2383 | capid = parse_cap(iterator->elem); |
2384 | if (capid == cap) | |
2385 | return 1; | |
2386 | } | |
2387 | ||
2388 | return 0; | |
2389 | } | |
2390 | ||
81810dd1 DL |
2391 | static int setup_caps(struct lxc_list *caps) |
2392 | { | |
bab88e68 | 2393 | int capid; |
0fd73091 CB |
2394 | char *drop_entry; |
2395 | struct lxc_list *iterator; | |
81810dd1 | 2396 | |
0fd73091 CB |
2397 | lxc_list_for_each (iterator, caps) { |
2398 | int ret; | |
81810dd1 DL |
2399 | |
2400 | drop_entry = iterator->elem; | |
2401 | ||
bab88e68 | 2402 | capid = parse_cap(drop_entry); |
0fd73091 | 2403 | if (capid < 0) { |
1e11be34 DL |
2404 | ERROR("unknown capability %s", drop_entry); |
2405 | return -1; | |
81810dd1 DL |
2406 | } |
2407 | ||
0fd73091 CB |
2408 | ret = prctl(PR_CAPBSET_DROP, capid, 0, 0, 0); |
2409 | if (ret < 0) { | |
2410 | SYSERROR("Failed to remove %s capability", drop_entry); | |
3ec1648d SH |
2411 | return -1; |
2412 | } | |
0fd73091 | 2413 | DEBUG("Dropped %s (%d) capability", drop_entry, capid); |
81810dd1 DL |
2414 | } |
2415 | ||
0fd73091 | 2416 | DEBUG("Capabilities have been setup"); |
1fb86a7c SH |
2417 | return 0; |
2418 | } | |
2419 | ||
2420 | static int dropcaps_except(struct lxc_list *caps) | |
2421 | { | |
0fd73091 | 2422 | int i, capid, numcaps; |
1fb86a7c | 2423 | char *keep_entry; |
0fd73091 | 2424 | struct lxc_list *iterator; |
1fb86a7c | 2425 | |
0fd73091 | 2426 | numcaps = lxc_caps_last_cap() + 1; |
2caf9a97 SH |
2427 | if (numcaps <= 0 || numcaps > 200) |
2428 | return -1; | |
0fd73091 | 2429 | TRACE("Found %d capabilities", numcaps); |
2caf9a97 | 2430 | |
1a0e70ac | 2431 | /* caplist[i] is 1 if we keep capability i */ |
1fb86a7c SH |
2432 | int *caplist = alloca(numcaps * sizeof(int)); |
2433 | memset(caplist, 0, numcaps * sizeof(int)); | |
2434 | ||
0fd73091 | 2435 | lxc_list_for_each (iterator, caps) { |
1fb86a7c SH |
2436 | keep_entry = iterator->elem; |
2437 | ||
bab88e68 | 2438 | capid = parse_cap(keep_entry); |
7035407c DE |
2439 | if (capid == -2) |
2440 | continue; | |
2441 | ||
0fd73091 CB |
2442 | if (capid < 0) { |
2443 | ERROR("Unknown capability %s", keep_entry); | |
1fb86a7c SH |
2444 | return -1; |
2445 | } | |
2446 | ||
0fd73091 | 2447 | DEBUG("Keep capability %s (%d)", keep_entry, capid); |
1fb86a7c SH |
2448 | caplist[capid] = 1; |
2449 | } | |
0fd73091 CB |
2450 | |
2451 | for (i = 0; i < numcaps; i++) { | |
2452 | int ret; | |
2453 | ||
1fb86a7c SH |
2454 | if (caplist[i]) |
2455 | continue; | |
0fd73091 CB |
2456 | |
2457 | ret = prctl(PR_CAPBSET_DROP, i, 0, 0, 0); | |
2458 | if (ret < 0) { | |
2459 | SYSERROR("Failed to remove capability %d", i); | |
3ec1648d SH |
2460 | return -1; |
2461 | } | |
1fb86a7c SH |
2462 | } |
2463 | ||
0fd73091 | 2464 | DEBUG("Capabilities have been setup"); |
81810dd1 DL |
2465 | return 0; |
2466 | } | |
2467 | ||
0fd73091 CB |
2468 | static int parse_resource(const char *res) |
2469 | { | |
2470 | int ret; | |
c6d09e15 WB |
2471 | size_t i; |
2472 | int resid = -1; | |
2473 | ||
0fd73091 | 2474 | for (i = 0; i < sizeof(limit_opt) / sizeof(limit_opt[0]); ++i) |
c6d09e15 WB |
2475 | if (strcmp(res, limit_opt[i].name) == 0) |
2476 | return limit_opt[i].value; | |
c6d09e15 | 2477 | |
0fd73091 | 2478 | /* Try to see if it's numeric, so the user may specify |
c6d09e15 | 2479 | * resources that the running kernel knows about but |
0fd73091 CB |
2480 | * we don't. |
2481 | */ | |
2482 | ret = lxc_safe_int(res, &resid); | |
2483 | if (ret < 0) | |
2484 | return -1; | |
2485 | ||
2486 | return resid; | |
c6d09e15 WB |
2487 | } |
2488 | ||
0fd73091 CB |
2489 | int setup_resource_limits(struct lxc_list *limits, pid_t pid) |
2490 | { | |
2491 | int resid; | |
c6d09e15 WB |
2492 | struct lxc_list *it; |
2493 | struct lxc_limit *lim; | |
c6d09e15 | 2494 | |
0fd73091 | 2495 | lxc_list_for_each (it, limits) { |
c6d09e15 WB |
2496 | lim = it->elem; |
2497 | ||
2498 | resid = parse_resource(lim->resource); | |
2499 | if (resid < 0) { | |
0fd73091 | 2500 | ERROR("Unknown resource %s", lim->resource); |
c6d09e15 WB |
2501 | return -1; |
2502 | } | |
2503 | ||
f48b5fd8 | 2504 | #if HAVE_PRLIMIT || HAVE_PRLIMIT64 |
c6d09e15 | 2505 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) { |
0fd73091 CB |
2506 | ERROR("Failed to set limit %s: %s", lim->resource, |
2507 | strerror(errno)); | |
c6d09e15 WB |
2508 | return -1; |
2509 | } | |
f48b5fd8 FF |
2510 | #else |
2511 | ERROR("Cannot set limit %s as prlimit is missing", lim->resource); | |
2512 | return -1; | |
2513 | #endif | |
c6d09e15 | 2514 | } |
0fd73091 | 2515 | |
c6d09e15 WB |
2516 | return 0; |
2517 | } | |
2518 | ||
7edd0540 L |
2519 | int setup_sysctl_parameters(struct lxc_list *sysctls) |
2520 | { | |
2521 | struct lxc_list *it; | |
2522 | struct lxc_sysctl *elem; | |
0fd73091 | 2523 | int ret = 0; |
7edd0540 L |
2524 | char *tmp = NULL; |
2525 | char filename[MAXPATHLEN] = {0}; | |
7edd0540 | 2526 | |
0fd73091 | 2527 | lxc_list_for_each (it, sysctls) { |
7edd0540 L |
2528 | elem = it->elem; |
2529 | tmp = lxc_string_replace(".", "/", elem->key); | |
2530 | if (!tmp) { | |
2531 | ERROR("Failed to replace key %s", elem->key); | |
2532 | return -1; | |
2533 | } | |
2534 | ||
2535 | ret = snprintf(filename, sizeof(filename), "/proc/sys/%s", tmp); | |
2536 | free(tmp); | |
2537 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { | |
2538 | ERROR("Error setting up sysctl parameters path"); | |
2539 | return -1; | |
2540 | } | |
2541 | ||
0fd73091 CB |
2542 | ret = lxc_write_to_file(filename, elem->value, |
2543 | strlen(elem->value), false); | |
7edd0540 | 2544 | if (ret < 0) { |
0fd73091 CB |
2545 | ERROR("Failed to setup sysctl parameters %s to %s", |
2546 | elem->key, elem->value); | |
7edd0540 L |
2547 | return -1; |
2548 | } | |
2549 | } | |
0fd73091 | 2550 | |
7edd0540 L |
2551 | return 0; |
2552 | } | |
2553 | ||
61d7a733 YT |
2554 | int setup_proc_filesystem(struct lxc_list *procs, pid_t pid) |
2555 | { | |
2556 | struct lxc_list *it; | |
2557 | struct lxc_proc *elem; | |
0fd73091 | 2558 | int ret = 0; |
61d7a733 YT |
2559 | char *tmp = NULL; |
2560 | char filename[MAXPATHLEN] = {0}; | |
61d7a733 | 2561 | |
0fd73091 | 2562 | lxc_list_for_each (it, procs) { |
61d7a733 YT |
2563 | elem = it->elem; |
2564 | tmp = lxc_string_replace(".", "/", elem->filename); | |
2565 | if (!tmp) { | |
2566 | ERROR("Failed to replace key %s", elem->filename); | |
2567 | return -1; | |
2568 | } | |
2569 | ||
2570 | ret = snprintf(filename, sizeof(filename), "/proc/%d/%s", pid, tmp); | |
2571 | free(tmp); | |
2572 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { | |
2573 | ERROR("Error setting up proc filesystem path"); | |
2574 | return -1; | |
2575 | } | |
2576 | ||
0fd73091 CB |
2577 | ret = lxc_write_to_file(filename, elem->value, |
2578 | strlen(elem->value), false); | |
61d7a733 | 2579 | if (ret < 0) { |
0fd73091 CB |
2580 | ERROR("Failed to setup proc filesystem %s to %s", |
2581 | elem->filename, elem->value); | |
61d7a733 YT |
2582 | return -1; |
2583 | } | |
2584 | } | |
0fd73091 | 2585 | |
61d7a733 YT |
2586 | return 0; |
2587 | } | |
2588 | ||
ae9242c8 SH |
2589 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2590 | ||
7b379ab3 | 2591 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2592 | { |
26ddeedd | 2593 | int i; |
0fd73091 | 2594 | struct lxc_conf *new; |
7b379ab3 | 2595 | |
13277ec4 | 2596 | new = malloc(sizeof(*new)); |
0fd73091 | 2597 | if (!new) |
7b379ab3 | 2598 | return NULL; |
7b379ab3 MN |
2599 | memset(new, 0, sizeof(*new)); |
2600 | ||
4b73005c | 2601 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
cccc74b5 | 2602 | new->personality = -1; |
124fa0a8 | 2603 | new->autodev = 1; |
3a784510 | 2604 | new->console.buffer_size = 0; |
596a818d DE |
2605 | new->console.log_path = NULL; |
2606 | new->console.log_fd = -1; | |
861813e5 | 2607 | new->console.log_size = 0; |
28a4b0e5 | 2608 | new->console.path = NULL; |
63376d7d | 2609 | new->console.peer = -1; |
fb87aa6a CB |
2610 | new->console.proxy.busy = -1; |
2611 | new->console.proxy.master = -1; | |
2612 | new->console.proxy.slave = -1; | |
63376d7d DL |
2613 | new->console.master = -1; |
2614 | new->console.slave = -1; | |
2615 | new->console.name[0] = '\0'; | |
732375f5 | 2616 | memset(&new->console.ringbuf, 0, sizeof(struct lxc_ringbuf)); |
d2e30e99 | 2617 | new->maincmd_fd = -1; |
76a26f55 | 2618 | new->nbd_idx = -1; |
54c30e29 | 2619 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 2620 | if (!new->rootfs.mount) { |
53f3f048 SH |
2621 | free(new); |
2622 | return NULL; | |
2623 | } | |
858377e4 | 2624 | new->logfd = -1; |
7b379ab3 | 2625 | lxc_list_init(&new->cgroup); |
54860ed0 | 2626 | lxc_list_init(&new->cgroup2); |
7b379ab3 MN |
2627 | lxc_list_init(&new->network); |
2628 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2629 | lxc_list_init(&new->caps); |
1fb86a7c | 2630 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2631 | lxc_list_init(&new->id_map); |
46ad64ab CB |
2632 | new->root_nsuid_map = NULL; |
2633 | new->root_nsgid_map = NULL; | |
f979ac15 | 2634 | lxc_list_init(&new->includes); |
4184c3e1 | 2635 | lxc_list_init(&new->aliens); |
7c661726 | 2636 | lxc_list_init(&new->environment); |
c6d09e15 | 2637 | lxc_list_init(&new->limits); |
7edd0540 | 2638 | lxc_list_init(&new->sysctls); |
61d7a733 | 2639 | lxc_list_init(&new->procs); |
44ae0fb6 | 2640 | new->hooks_version = 0; |
28d9e29e | 2641 | for (i = 0; i < NUM_LXC_HOOKS; i++) |
26ddeedd | 2642 | lxc_list_init(&new->hooks[i]); |
ee1e7aa0 | 2643 | lxc_list_init(&new->groups); |
d39b10eb | 2644 | lxc_list_init(&new->state_clients); |
fe4de9a6 DE |
2645 | new->lsm_aa_profile = NULL; |
2646 | new->lsm_se_context = NULL; | |
5112cd70 | 2647 | new->tmp_umount_proc = 0; |
7b379ab3 | 2648 | |
72bb04e4 PT |
2649 | /* if running in a new user namespace, init and COMMAND |
2650 | * default to running as UID/GID 0 when using lxc-execute */ | |
2651 | new->init_uid = 0; | |
2652 | new->init_gid = 0; | |
43654d34 | 2653 | memset(&new->cgroup_meta, 0, sizeof(struct lxc_cgroup)); |
b074bbf1 | 2654 | memset(&new->ns_share, 0, sizeof(char *) * LXC_NS_MAX); |
72bb04e4 | 2655 | |
7b379ab3 | 2656 | return new; |
089cd8b8 DL |
2657 | } |
2658 | ||
344c9d81 | 2659 | int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
a19b974f | 2660 | size_t buf_size) |
f6d3e3e4 | 2661 | { |
29053180 | 2662 | int fd, ret; |
0fd73091 | 2663 | char path[MAXPATHLEN]; |
f6d3e3e4 | 2664 | |
a19b974f CB |
2665 | if (geteuid() != 0 && idtype == ID_TYPE_GID) { |
2666 | size_t buflen; | |
2667 | ||
2668 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/setgroups", pid); | |
0fd73091 | 2669 | if (ret < 0 || ret >= MAXPATHLEN) |
a19b974f | 2670 | return -E2BIG; |
a19b974f CB |
2671 | |
2672 | fd = open(path, O_WRONLY); | |
2673 | if (fd < 0 && errno != ENOENT) { | |
2674 | SYSERROR("Failed to open \"%s\"", path); | |
2675 | return -1; | |
2676 | } | |
2677 | ||
2388737b CB |
2678 | if (fd >= 0) { |
2679 | buflen = sizeof("deny\n") - 1; | |
2680 | errno = 0; | |
2681 | ret = lxc_write_nointr(fd, "deny\n", buflen); | |
2682 | if (ret != buflen) { | |
0fd73091 CB |
2683 | SYSERROR("Failed to write \"deny\" to " |
2684 | "\"/proc/%d/setgroups\"", pid); | |
2388737b CB |
2685 | close(fd); |
2686 | return -1; | |
2687 | } | |
a19b974f | 2688 | close(fd); |
a19b974f | 2689 | } |
a19b974f CB |
2690 | } |
2691 | ||
29053180 CB |
2692 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/%cid_map", pid, |
2693 | idtype == ID_TYPE_UID ? 'u' : 'g'); | |
0fd73091 | 2694 | if (ret < 0 || ret >= MAXPATHLEN) |
f6d3e3e4 | 2695 | return -E2BIG; |
29053180 CB |
2696 | |
2697 | fd = open(path, O_WRONLY); | |
2698 | if (fd < 0) { | |
a19b974f | 2699 | SYSERROR("Failed to open \"%s\"", path); |
29053180 | 2700 | return -1; |
f6d3e3e4 | 2701 | } |
29053180 CB |
2702 | |
2703 | errno = 0; | |
2704 | ret = lxc_write_nointr(fd, buf, buf_size); | |
2705 | if (ret != buf_size) { | |
a19b974f | 2706 | SYSERROR("Failed to write %cid mapping to \"%s\"", |
29053180 CB |
2707 | idtype == ID_TYPE_UID ? 'u' : 'g', path); |
2708 | close(fd); | |
2709 | return -1; | |
2710 | } | |
2711 | close(fd); | |
2712 | ||
2713 | return 0; | |
f6d3e3e4 SH |
2714 | } |
2715 | ||
6e50e704 CB |
2716 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
2717 | * | |
2718 | * @return 1 if functional binary was found | |
2719 | * @return 0 if binary exists but is lacking privilege | |
2720 | * @return -ENOENT if binary does not exist | |
2721 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
6e50e704 | 2722 | */ |
df6a2945 CB |
2723 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
2724 | { | |
2725 | char *path; | |
2726 | int ret; | |
2727 | struct stat st; | |
2728 | int fret = 0; | |
2729 | ||
6e50e704 CB |
2730 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
2731 | return -EINVAL; | |
2732 | ||
df6a2945 CB |
2733 | path = on_path(binary, NULL); |
2734 | if (!path) | |
2735 | return -ENOENT; | |
2736 | ||
2737 | ret = stat(path, &st); | |
2738 | if (ret < 0) { | |
2739 | fret = -errno; | |
2740 | goto cleanup; | |
2741 | } | |
2742 | ||
2743 | /* Check if the binary is setuid. */ | |
2744 | if (st.st_mode & S_ISUID) { | |
0fd73091 | 2745 | DEBUG("The binary \"%s\" does have the setuid bit set", path); |
df6a2945 CB |
2746 | fret = 1; |
2747 | goto cleanup; | |
2748 | } | |
2749 | ||
0fd73091 | 2750 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
2751 | /* Check if it has the CAP_SETUID capability. */ |
2752 | if ((cap & CAP_SETUID) && | |
2753 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
2754 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) { | |
2755 | DEBUG("The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE " | |
0fd73091 | 2756 | "and CAP_PERMITTED sets", path); |
df6a2945 CB |
2757 | fret = 1; |
2758 | goto cleanup; | |
2759 | } | |
2760 | ||
2761 | /* Check if it has the CAP_SETGID capability. */ | |
2762 | if ((cap & CAP_SETGID) && | |
2763 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
2764 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) { | |
2765 | DEBUG("The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE " | |
0fd73091 | 2766 | "and CAP_PERMITTED sets", path); |
df6a2945 CB |
2767 | fret = 1; |
2768 | goto cleanup; | |
2769 | } | |
0fd73091 | 2770 | #else |
69924fff CB |
2771 | /* If we cannot check for file capabilities we need to give the benefit |
2772 | * of the doubt. Otherwise we might fail even though all the necessary | |
2773 | * file capabilities are set. | |
2774 | */ | |
d6018f88 | 2775 | DEBUG("Cannot check for file capabilites as full capability support is " |
0fd73091 | 2776 | "missing. Manual intervention needed"); |
d6018f88 | 2777 | fret = 1; |
0fd73091 | 2778 | #endif |
df6a2945 CB |
2779 | |
2780 | cleanup: | |
2781 | free(path); | |
2782 | return fret; | |
2783 | } | |
2784 | ||
986ef930 CB |
2785 | int lxc_map_ids_exec_wrapper(void *args) |
2786 | { | |
2787 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
2788 | return -1; | |
2789 | } | |
2790 | ||
f6d3e3e4 SH |
2791 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) |
2792 | { | |
0fd73091 | 2793 | int fill, left; |
986ef930 | 2794 | char u_or_g; |
4bc3b759 | 2795 | char *pos; |
986ef930 | 2796 | char cmd_output[MAXPATHLEN]; |
0fd73091 CB |
2797 | struct id_map *map; |
2798 | struct lxc_list *iterator; | |
2799 | enum idtype type; | |
986ef930 CB |
2800 | /* strlen("new@idmap") = 9 |
2801 | * + | |
2802 | * strlen(" ") = 1 | |
2803 | * + | |
2804 | * LXC_NUMSTRLEN64 | |
2805 | * + | |
2806 | * strlen(" ") = 1 | |
2807 | * | |
2808 | * We add some additional space to make sure that we really have | |
2809 | * LXC_IDMAPLEN bytes available for our the {g,u]id mapping. | |
2810 | */ | |
0fd73091 | 2811 | int ret = 0, gidmap = 0, uidmap = 0; |
986ef930 | 2812 | char mapbuf[9 + 1 + LXC_NUMSTRLEN64 + 1 + LXC_IDMAPLEN] = {0}; |
0fd73091 | 2813 | bool had_entry = false, use_shadow = false; |
df6a2945 CB |
2814 | |
2815 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid | |
2816 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
2817 | * will protected it by preventing another user from being handed the |
2818 | * range by shadow. | |
2819 | */ | |
df6a2945 | 2820 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
2821 | if (uidmap == -ENOENT) |
2822 | WARN("newuidmap binary is missing"); | |
2823 | else if (!uidmap) | |
2824 | WARN("newuidmap is lacking necessary privileges"); | |
2825 | ||
df6a2945 | 2826 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
2827 | if (gidmap == -ENOENT) |
2828 | WARN("newgidmap binary is missing"); | |
2829 | else if (!gidmap) | |
2830 | WARN("newgidmap is lacking necessary privileges"); | |
2831 | ||
df6a2945 | 2832 | if (uidmap > 0 && gidmap > 0) { |
0fd73091 | 2833 | DEBUG("Functional newuidmap and newgidmap binary found"); |
4bc3b759 | 2834 | use_shadow = true; |
df6a2945 | 2835 | } else { |
99d43365 CB |
2836 | /* In case unprivileged users run application containers via |
2837 | * execute() or a start*() there are valid cases where they may | |
2838 | * only want to map their own {g,u}id. Let's not block them from | |
2839 | * doing so by requiring geteuid() == 0. | |
2840 | */ | |
2841 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
0fd73091 | 2842 | "write directly with euid %d", geteuid()); |
0e6e3a41 | 2843 | } |
251d0d2a | 2844 | |
986ef930 CB |
2845 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
2846 | type++, u_or_g = 'g') { | |
2847 | pos = mapbuf; | |
2848 | ||
0e6e3a41 | 2849 | if (use_shadow) |
986ef930 | 2850 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 2851 | |
cf3ef16d | 2852 | lxc_list_for_each(iterator, idmap) { |
251d0d2a | 2853 | map = iterator->elem; |
cf3ef16d SH |
2854 | if (map->idtype != type) |
2855 | continue; | |
2856 | ||
4bc3b759 CB |
2857 | had_entry = true; |
2858 | ||
986ef930 | 2859 | left = LXC_IDMAPLEN - (pos - mapbuf); |
d1838f34 | 2860 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
2861 | use_shadow ? " " : "", map->nsid, |
2862 | map->hostid, map->range, | |
0e6e3a41 | 2863 | use_shadow ? "" : "\n"); |
a427e268 CB |
2864 | if (fill <= 0 || fill >= left) { |
2865 | /* The kernel only takes <= 4k for writes to | |
2866 | * /proc/<pid>/{g,u}id_map | |
2867 | */ | |
2868 | SYSERROR("Too many %cid mappings defined", u_or_g); | |
2869 | return -1; | |
2870 | } | |
4bc3b759 | 2871 | |
cf3ef16d | 2872 | pos += fill; |
251d0d2a | 2873 | } |
cf3ef16d | 2874 | if (!had_entry) |
4f7521b4 | 2875 | continue; |
cf3ef16d | 2876 | |
986ef930 CB |
2877 | /* Try to catch the ouput of new{g,u}idmap to make debugging |
2878 | * easier. | |
2879 | */ | |
2880 | if (use_shadow) { | |
2881 | ret = run_command(cmd_output, sizeof(cmd_output), | |
2882 | lxc_map_ids_exec_wrapper, | |
2883 | (void *)mapbuf); | |
2884 | if (ret < 0) { | |
54fbbeb5 CB |
2885 | ERROR("new%cidmap failed to write mapping \"%s\": %s", |
2886 | u_or_g, cmd_output, mapbuf); | |
986ef930 CB |
2887 | return -1; |
2888 | } | |
54fbbeb5 | 2889 | TRACE("new%cidmap wrote mapping \"%s\"", u_or_g, mapbuf); |
d1838f34 | 2890 | } else { |
986ef930 | 2891 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
54fbbeb5 | 2892 | if (ret < 0) { |
da0f9977 | 2893 | ERROR("Failed to write mapping: %s", mapbuf); |
986ef930 | 2894 | return -1; |
54fbbeb5 CB |
2895 | } |
2896 | TRACE("Wrote mapping \"%s\"", mapbuf); | |
d1838f34 | 2897 | } |
986ef930 CB |
2898 | |
2899 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 2900 | } |
251d0d2a | 2901 | |
986ef930 | 2902 | return 0; |
f6d3e3e4 SH |
2903 | } |
2904 | ||
0fd73091 | 2905 | /* Return the host uid/gid to which the container root is mapped in val. |
0b3a6504 | 2906 | * Return true if id was found, false otherwise. |
cf3ef16d | 2907 | */ |
2a9a80cb | 2908 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
4160c3a0 | 2909 | unsigned long *val) |
cf3ef16d | 2910 | { |
4160c3a0 | 2911 | unsigned nsid; |
0fd73091 CB |
2912 | struct id_map *map; |
2913 | struct lxc_list *it; | |
4160c3a0 CB |
2914 | |
2915 | if (idtype == ID_TYPE_UID) | |
2916 | nsid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; | |
2917 | else | |
2918 | nsid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
cf3ef16d | 2919 | |
0fd73091 | 2920 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 2921 | map = it->elem; |
7b50c609 | 2922 | if (map->idtype != idtype) |
cf3ef16d | 2923 | continue; |
4160c3a0 | 2924 | if (map->nsid != nsid) |
cf3ef16d | 2925 | continue; |
2a9a80cb SH |
2926 | *val = map->hostid; |
2927 | return true; | |
cf3ef16d | 2928 | } |
4160c3a0 | 2929 | |
2a9a80cb | 2930 | return false; |
cf3ef16d SH |
2931 | } |
2932 | ||
2133f58c | 2933 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 2934 | { |
cf3ef16d | 2935 | struct id_map *map; |
0fd73091 CB |
2936 | struct lxc_list *it; |
2937 | ||
2938 | lxc_list_for_each (it, &conf->id_map) { | |
cf3ef16d | 2939 | map = it->elem; |
2133f58c | 2940 | if (map->idtype != idtype) |
cf3ef16d | 2941 | continue; |
0fd73091 | 2942 | |
cf3ef16d | 2943 | if (id >= map->hostid && id < map->hostid + map->range) |
57d116ab | 2944 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 2945 | } |
0fd73091 | 2946 | |
57d116ab | 2947 | return -1; |
cf3ef16d SH |
2948 | } |
2949 | ||
339efad9 | 2950 | int find_unmapped_nsid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 2951 | { |
cf3ef16d | 2952 | struct id_map *map; |
0fd73091 | 2953 | struct lxc_list *it; |
2133f58c | 2954 | unsigned int freeid = 0; |
0fd73091 | 2955 | |
cf3ef16d | 2956 | again: |
0fd73091 | 2957 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 2958 | map = it->elem; |
2133f58c | 2959 | if (map->idtype != idtype) |
cf3ef16d | 2960 | continue; |
0fd73091 | 2961 | |
cf3ef16d SH |
2962 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { |
2963 | freeid = map->nsid + map->range; | |
2964 | goto again; | |
2965 | } | |
2966 | } | |
0fd73091 | 2967 | |
cf3ef16d SH |
2968 | return freeid; |
2969 | } | |
2970 | ||
f4f52cb5 CB |
2971 | int chown_mapped_root_exec_wrapper(void *args) |
2972 | { | |
2973 | execvp("lxc-usernsexec", args); | |
2974 | return -1; | |
2975 | } | |
2976 | ||
0fd73091 | 2977 | /* chown_mapped_root: for an unprivileged user with uid/gid X to |
7b50c609 TS |
2978 | * chown a dir to subuid/subgid Y, he needs to run chown as root |
2979 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
2980 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
2981 | * root is privileged with respect to hostuid/hostgid X, allowing | |
2982 | * him to do the chown. | |
f6d3e3e4 | 2983 | */ |
41dc7155 | 2984 | int chown_mapped_root(const char *path, struct lxc_conf *conf) |
f6d3e3e4 | 2985 | { |
f4f52cb5 | 2986 | uid_t rootuid, rootgid; |
2a9a80cb | 2987 | unsigned long val; |
f4f52cb5 CB |
2988 | int hostuid, hostgid, ret; |
2989 | struct stat sb; | |
2990 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
2991 | char ugid[100]; | |
41dc7155 | 2992 | const char *args1[] = {"lxc-usernsexec", |
f4f52cb5 CB |
2993 | "-m", map1, |
2994 | "-m", map2, | |
2995 | "-m", map3, | |
2996 | "-m", map5, | |
2997 | "--", "chown", ugid, path, | |
2998 | NULL}; | |
41dc7155 | 2999 | const char *args2[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3000 | "-m", map1, |
3001 | "-m", map2, | |
3002 | "-m", map3, | |
3003 | "-m", map4, | |
3004 | "-m", map5, | |
3005 | "--", "chown", ugid, path, | |
3006 | NULL}; | |
3007 | char cmd_output[MAXPATHLEN]; | |
3008 | ||
3009 | hostuid = geteuid(); | |
3010 | hostgid = getegid(); | |
f6d3e3e4 | 3011 | |
2a9a80cb | 3012 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
bc80f098 | 3013 | ERROR("No uid mapping for container root"); |
c4d10a05 | 3014 | return -1; |
f6d3e3e4 | 3015 | } |
f4f52cb5 | 3016 | rootuid = (uid_t)val; |
0fd73091 | 3017 | |
7b50c609 | 3018 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { |
bc80f098 | 3019 | ERROR("No gid mapping for container root"); |
7b50c609 TS |
3020 | return -1; |
3021 | } | |
f4f52cb5 | 3022 | rootgid = (gid_t)val; |
2a9a80cb | 3023 | |
f4f52cb5 | 3024 | if (hostuid == 0) { |
7b50c609 | 3025 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3026 | ERROR("Error chowning %s", path); |
3027 | return -1; | |
3028 | } | |
0fd73091 | 3029 | |
c4d10a05 SH |
3030 | return 0; |
3031 | } | |
f3d7e4ca | 3032 | |
f4f52cb5 | 3033 | if (rootuid == hostuid) { |
1a0e70ac | 3034 | /* nothing to do */ |
b103ceac | 3035 | INFO("Container root is our uid; no need to chown"); |
f3d7e4ca SH |
3036 | return 0; |
3037 | } | |
3038 | ||
bbdbf8f0 | 3039 | /* save the current gid of "path" */ |
f4f52cb5 CB |
3040 | if (stat(path, &sb) < 0) { |
3041 | ERROR("Error stat %s", path); | |
f6d3e3e4 SH |
3042 | return -1; |
3043 | } | |
7b50c609 | 3044 | |
bbdbf8f0 CB |
3045 | /* Update the path argument in case this was overlayfs. */ |
3046 | args1[sizeof(args1) / sizeof(args1[0]) - 2] = path; | |
3047 | args2[sizeof(args2) / sizeof(args2[0]) - 2] = path; | |
3048 | ||
f4f52cb5 CB |
3049 | /* |
3050 | * A file has to be group-owned by a gid mapped into the | |
3051 | * container, or the container won't be privileged over it. | |
3052 | */ | |
3053 | DEBUG("trying to chown \"%s\" to %d", path, hostgid); | |
3054 | if (sb.st_uid == hostuid && | |
3055 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3056 | chown(path, -1, hostgid) < 0) { | |
3057 | ERROR("Failed chgrping %s", path); | |
3058 | return -1; | |
3059 | } | |
f6d3e3e4 | 3060 | |
1a0e70ac | 3061 | /* "u:0:rootuid:1" */ |
f4f52cb5 CB |
3062 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); |
3063 | if (ret < 0 || ret >= 100) { | |
3064 | ERROR("Error uid printing map string"); | |
3065 | return -1; | |
3066 | } | |
7b50c609 | 3067 | |
1a0e70ac | 3068 | /* "u:hostuid:hostuid:1" */ |
f4f52cb5 CB |
3069 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); |
3070 | if (ret < 0 || ret >= 100) { | |
3071 | ERROR("Error uid printing map string"); | |
3072 | return -1; | |
3073 | } | |
c4d10a05 | 3074 | |
1a0e70ac | 3075 | /* "g:0:rootgid:1" */ |
f4f52cb5 CB |
3076 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); |
3077 | if (ret < 0 || ret >= 100) { | |
3078 | ERROR("Error gid printing map string"); | |
3079 | return -1; | |
3080 | } | |
98e5ba51 | 3081 | |
1a0e70ac | 3082 | /* "g:pathgid:rootgid+pathgid:1" */ |
f4f52cb5 CB |
3083 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, |
3084 | rootgid + (gid_t)sb.st_gid); | |
3085 | if (ret < 0 || ret >= 100) { | |
3086 | ERROR("Error gid printing map string"); | |
3087 | return -1; | |
3088 | } | |
c4d10a05 | 3089 | |
1a0e70ac | 3090 | /* "g:hostgid:hostgid:1" */ |
f4f52cb5 CB |
3091 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); |
3092 | if (ret < 0 || ret >= 100) { | |
3093 | ERROR("Error gid printing map string"); | |
3094 | return -1; | |
3095 | } | |
7b50c609 | 3096 | |
1a0e70ac | 3097 | /* "0:pathgid" (chown) */ |
f4f52cb5 CB |
3098 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); |
3099 | if (ret < 0 || ret >= 100) { | |
3100 | ERROR("Error owner printing format string for chown"); | |
3101 | return -1; | |
3102 | } | |
7b50c609 | 3103 | |
f4f52cb5 CB |
3104 | if (hostgid == sb.st_gid) |
3105 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3106 | chown_mapped_root_exec_wrapper, | |
3107 | (void *)args1); | |
3108 | else | |
3109 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3110 | chown_mapped_root_exec_wrapper, | |
3111 | (void *)args2); | |
3112 | if (ret < 0) | |
3113 | ERROR("lxc-usernsexec failed: %s", cmd_output); | |
7b50c609 | 3114 | |
f4f52cb5 | 3115 | return ret; |
f6d3e3e4 SH |
3116 | } |
3117 | ||
943144d9 CB |
3118 | /* NOTE: Must not be called from inside the container namespace! */ |
3119 | int lxc_create_tmp_proc_mount(struct lxc_conf *conf) | |
5112cd70 SH |
3120 | { |
3121 | int mounted; | |
3122 | ||
943144d9 | 3123 | mounted = lxc_mount_proc_if_needed(conf->rootfs.path ? conf->rootfs.mount : ""); |
5112cd70 | 3124 | if (mounted == -1) { |
0fd73091 | 3125 | SYSERROR("Failed to mount proc in the container"); |
01958b1f | 3126 | /* continue only if there is no rootfs */ |
943144d9 | 3127 | if (conf->rootfs.path) |
01958b1f | 3128 | return -1; |
5112cd70 | 3129 | } else if (mounted == 1) { |
943144d9 | 3130 | conf->tmp_umount_proc = 1; |
5112cd70 | 3131 | } |
943144d9 | 3132 | |
5112cd70 SH |
3133 | return 0; |
3134 | } | |
3135 | ||
3136 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3137 | { | |
0fd73091 CB |
3138 | if (lxc_conf->tmp_umount_proc != 1) |
3139 | return; | |
3140 | ||
3141 | umount("/proc"); | |
3142 | lxc_conf->tmp_umount_proc = 0; | |
5112cd70 SH |
3143 | } |
3144 | ||
0fd73091 | 3145 | /* Walk /proc/mounts and change any shared entries to slave. */ |
6a0c909a | 3146 | void remount_all_slave(void) |
e995d7a2 | 3147 | { |
0fd73091 | 3148 | FILE *f; |
e995d7a2 | 3149 | size_t len = 0; |
0fd73091 | 3150 | char *line = NULL; |
e995d7a2 | 3151 | |
0fd73091 | 3152 | f = fopen("/proc/self/mountinfo", "r"); |
e995d7a2 | 3153 | if (!f) { |
0fd73091 | 3154 | SYSERROR("Failed to open \"/proc/self/mountinfo\" to mark all shared"); |
e995d7a2 SH |
3155 | ERROR("Continuing container startup..."); |
3156 | return; | |
3157 | } | |
3158 | ||
3159 | while (getline(&line, &len, f) != -1) { | |
0fd73091 CB |
3160 | int ret; |
3161 | char *opts, *target; | |
3162 | ||
e995d7a2 SH |
3163 | target = get_field(line, 4); |
3164 | if (!target) | |
3165 | continue; | |
0fd73091 | 3166 | |
e995d7a2 SH |
3167 | opts = get_field(target, 2); |
3168 | if (!opts) | |
3169 | continue; | |
0fd73091 | 3170 | |
e995d7a2 SH |
3171 | null_endofword(opts); |
3172 | if (!strstr(opts, "shared")) | |
3173 | continue; | |
0fd73091 | 3174 | |
e995d7a2 | 3175 | null_endofword(target); |
0fd73091 CB |
3176 | ret = mount(NULL, target, NULL, MS_SLAVE, NULL); |
3177 | if (ret < 0) { | |
3178 | SYSERROR("Failed to make \"%s\" MS_SLAVE", target); | |
e995d7a2 SH |
3179 | ERROR("Continuing..."); |
3180 | } | |
3181 | } | |
3182 | fclose(f); | |
f10fad2f | 3183 | free(line); |
e995d7a2 SH |
3184 | } |
3185 | ||
8353b4c9 | 3186 | static int lxc_execute_bind_init(struct lxc_conf *conf) |
2322903b SH |
3187 | { |
3188 | int ret; | |
9d9c111c SH |
3189 | char path[PATH_MAX], destpath[PATH_MAX], *p; |
3190 | ||
3191 | /* If init exists in the container, don't bind mount a static one */ | |
3192 | p = choose_init(conf->rootfs.mount); | |
3193 | if (p) { | |
3194 | free(p); | |
8353b4c9 | 3195 | return 0; |
9d9c111c | 3196 | } |
2322903b SH |
3197 | |
3198 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
0fd73091 | 3199 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3200 | return -1; |
2322903b SH |
3201 | |
3202 | if (!file_exists(path)) { | |
0fd73091 | 3203 | ERROR("The file \"%s\" does not exist on host", path); |
8353b4c9 | 3204 | return -1; |
2322903b SH |
3205 | } |
3206 | ||
3207 | ret = snprintf(destpath, PATH_MAX, "%s%s", conf->rootfs.mount, "/init.lxc.static"); | |
0fd73091 | 3208 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3209 | return -1; |
2322903b SH |
3210 | |
3211 | if (!file_exists(destpath)) { | |
0fd73091 CB |
3212 | FILE *pathfile; |
3213 | ||
3214 | pathfile = fopen(destpath, "wb"); | |
2322903b | 3215 | if (!pathfile) { |
8353b4c9 CB |
3216 | SYSERROR("Failed to create mount target \"%s\"", destpath); |
3217 | return -1; | |
2322903b | 3218 | } |
8353b4c9 | 3219 | |
2322903b SH |
3220 | fclose(pathfile); |
3221 | } | |
3222 | ||
592fd47a | 3223 | ret = safe_mount(path, destpath, "none", MS_BIND, NULL, conf->rootfs.mount); |
8353b4c9 | 3224 | if (ret < 0) { |
0fd73091 | 3225 | SYSERROR("Failed to bind mount lxc.init.static into container"); |
8353b4c9 CB |
3226 | return -1; |
3227 | } | |
3228 | ||
3229 | INFO("Bind mounted lxc.init.static into container at \"%s\"", path); | |
3230 | return 0; | |
2322903b SH |
3231 | } |
3232 | ||
0fd73091 CB |
3233 | /* This does the work of remounting / if it is shared, calling the container |
3234 | * pre-mount hooks, and mounting the rootfs. | |
35120d9c SH |
3235 | */ |
3236 | int do_rootfs_setup(struct lxc_conf *conf, const char *name, const char *lxcpath) | |
0ad19a3f | 3237 | { |
0fd73091 CB |
3238 | int ret; |
3239 | ||
35120d9c | 3240 | if (conf->rootfs_setup) { |
35120d9c | 3241 | const char *path = conf->rootfs.mount; |
0fd73091 CB |
3242 | |
3243 | /* The rootfs was set up in another namespace. bind-mount it to | |
3244 | * give us a mount in our own ns so we can pivot_root to it | |
3245 | */ | |
3246 | ret = mount(path, path, "rootfs", MS_BIND, NULL); | |
3247 | if (ret < 0) { | |
3248 | ERROR("Failed to bind mount container / onto itself"); | |
145832ba | 3249 | return -1; |
35120d9c | 3250 | } |
0fd73091 CB |
3251 | |
3252 | TRACE("Bind mounted container / onto itself"); | |
145832ba | 3253 | return 0; |
35120d9c | 3254 | } |
d4ef7c50 | 3255 | |
e995d7a2 SH |
3256 | remount_all_slave(); |
3257 | ||
0fd73091 CB |
3258 | ret = run_lxc_hooks(name, "pre-mount", conf, NULL); |
3259 | if (ret < 0) { | |
3260 | ERROR("Failed to run pre-mount hooks"); | |
35120d9c SH |
3261 | return -1; |
3262 | } | |
3263 | ||
0fd73091 CB |
3264 | ret = lxc_setup_rootfs(conf); |
3265 | if (ret < 0) { | |
3266 | ERROR("Failed to setup rootfs for"); | |
35120d9c SH |
3267 | return -1; |
3268 | } | |
3269 | ||
3270 | conf->rootfs_setup = true; | |
3271 | return 0; | |
3272 | } | |
3273 | ||
1c1c7051 SH |
3274 | static bool verify_start_hooks(struct lxc_conf *conf) |
3275 | { | |
1c1c7051 | 3276 | char path[MAXPATHLEN]; |
0fd73091 CB |
3277 | struct lxc_list *it; |
3278 | ||
3279 | lxc_list_for_each (it, &conf->hooks[LXCHOOK_START]) { | |
1c1c7051 | 3280 | int ret; |
0fd73091 CB |
3281 | struct stat st; |
3282 | char *hookname = it->elem; | |
1c1c7051 SH |
3283 | |
3284 | ret = snprintf(path, MAXPATHLEN, "%s%s", | |
0fd73091 CB |
3285 | conf->rootfs.path ? conf->rootfs.mount : "", |
3286 | hookname); | |
1c1c7051 SH |
3287 | if (ret < 0 || ret >= MAXPATHLEN) |
3288 | return false; | |
0fd73091 | 3289 | |
1c1c7051 | 3290 | ret = stat(path, &st); |
0fd73091 | 3291 | if (ret < 0) { |
7b6753e7 | 3292 | SYSERROR("Start hook %s not found in container", |
0fd73091 | 3293 | hookname); |
1c1c7051 SH |
3294 | return false; |
3295 | } | |
0fd73091 | 3296 | |
6a0c909a | 3297 | return true; |
1c1c7051 SH |
3298 | } |
3299 | ||
3300 | return true; | |
3301 | } | |
3302 | ||
3b988b33 | 3303 | int lxc_setup(struct lxc_handler *handler) |
35120d9c | 3304 | { |
2187efd3 | 3305 | int ret; |
0fd73091 | 3306 | const char *lxcpath = handler->lxcpath, *name = handler->name; |
35120d9c | 3307 | struct lxc_conf *lxc_conf = handler->conf; |
35120d9c | 3308 | |
8353b4c9 CB |
3309 | ret = do_rootfs_setup(lxc_conf, name, lxcpath); |
3310 | if (ret < 0) { | |
3311 | ERROR("Failed to setup rootfs"); | |
35120d9c SH |
3312 | return -1; |
3313 | } | |
3314 | ||
28d9e29e | 3315 | if (handler->nsfd[LXC_NS_UTS] == -1) { |
8353b4c9 CB |
3316 | ret = setup_utsname(lxc_conf->utsname); |
3317 | if (ret < 0) { | |
0fd73091 | 3318 | ERROR("Failed to setup the utsname %s", name); |
6c544cb3 MM |
3319 | return -1; |
3320 | } | |
0ad19a3f | 3321 | } |
3322 | ||
8353b4c9 CB |
3323 | ret = lxc_setup_network_in_child_namespaces(lxc_conf, &lxc_conf->network); |
3324 | if (ret < 0) { | |
3325 | ERROR("Failed to setup network"); | |
95b5ffaf | 3326 | return -1; |
0ad19a3f | 3327 | } |
3328 | ||
8353b4c9 CB |
3329 | ret = lxc_network_send_name_and_ifindex_to_parent(handler); |
3330 | if (ret < 0) { | |
3331 | ERROR("Failed to send network device names and ifindices to parent"); | |
790255cf CB |
3332 | return -1; |
3333 | } | |
3334 | ||
bc6928ff | 3335 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3336 | ret = mount_autodev(name, &lxc_conf->rootfs, lxcpath); |
3337 | if (ret < 0) { | |
3338 | ERROR("Failed to mount \"/dev\""); | |
c6883f38 SH |
3339 | return -1; |
3340 | } | |
3341 | } | |
3342 | ||
8353b4c9 CB |
3343 | /* Do automatic mounts (mainly /proc and /sys), but exclude those that |
3344 | * need to wait until other stuff has finished. | |
368bbc02 | 3345 | */ |
8353b4c9 CB |
3346 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler); |
3347 | if (ret < 0) { | |
3348 | ERROR("Failed to setup first automatic mounts"); | |
368bbc02 CS |
3349 | return -1; |
3350 | } | |
3351 | ||
8353b4c9 CB |
3352 | ret = setup_mount(lxc_conf, &lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath); |
3353 | if (ret < 0) { | |
3354 | ERROR("Failed to setup mounts"); | |
95b5ffaf | 3355 | return -1; |
576f946d | 3356 | } |
3357 | ||
7b6753e7 | 3358 | /* Make sure any start hooks are in the container */ |
1c1c7051 SH |
3359 | if (!verify_start_hooks(lxc_conf)) |
3360 | return -1; | |
3361 | ||
8353b4c9 CB |
3362 | if (lxc_conf->is_execute) { |
3363 | ret = lxc_execute_bind_init(lxc_conf); | |
3364 | if (ret < 0) { | |
3365 | ERROR("Failed to bind-mount the lxc init system"); | |
3366 | return -1; | |
3367 | } | |
3368 | } | |
2322903b | 3369 | |
8353b4c9 CB |
3370 | /* Now mount only cgroups, if wanted. Before, /sys could not have been |
3371 | * mounted. It is guaranteed to be mounted now either through | |
3372 | * automatically or via fstab entries. | |
368bbc02 | 3373 | */ |
8353b4c9 CB |
3374 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler); |
3375 | if (ret < 0) { | |
3376 | ERROR("Failed to setup remaining automatic mounts"); | |
368bbc02 CS |
3377 | return -1; |
3378 | } | |
3379 | ||
8353b4c9 | 3380 | ret = run_lxc_hooks(name, "mount", lxc_conf, NULL); |
1a2cf89d | 3381 | if (ret < 0) { |
8353b4c9 | 3382 | ERROR("Failed to run mount hooks"); |
773fb9ca SH |
3383 | return -1; |
3384 | } | |
3385 | ||
bc6928ff | 3386 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3387 | ret = run_lxc_hooks(name, "autodev", lxc_conf, NULL); |
3388 | if (ret < 0) { | |
3389 | ERROR("Failed to run autodev hooks"); | |
f7bee6c6 MW |
3390 | return -1; |
3391 | } | |
06749971 | 3392 | |
8353b4c9 CB |
3393 | ret = lxc_fill_autodev(&lxc_conf->rootfs); |
3394 | if (ret < 0) { | |
3395 | ERROR("Failed to populate \"/dev\""); | |
91c3830e SH |
3396 | return -1; |
3397 | } | |
3398 | } | |
368bbc02 | 3399 | |
8353b4c9 CB |
3400 | if (!lxc_list_empty(&lxc_conf->mount_list)) { |
3401 | ret = setup_mount_entries(lxc_conf, &lxc_conf->rootfs, | |
3402 | &lxc_conf->mount_list, name, lxcpath); | |
3403 | if (ret < 0) { | |
3404 | ERROR("Failed to setup mount entries"); | |
3405 | return -1; | |
3406 | } | |
181437fd YT |
3407 | } |
3408 | ||
ed8704d0 CB |
3409 | ret = lxc_setup_console(&lxc_conf->rootfs, &lxc_conf->console, |
3410 | lxc_conf->ttydir); | |
3411 | if (ret < 0) { | |
3412 | ERROR("Failed to setup console"); | |
95b5ffaf | 3413 | return -1; |
6e590161 | 3414 | } |
3415 | ||
ed8704d0 CB |
3416 | ret = lxc_setup_dev_symlinks(&lxc_conf->rootfs); |
3417 | if (ret < 0) { | |
8353b4c9 | 3418 | ERROR("Failed to setup \"/dev\" symlinks"); |
69aa6655 DE |
3419 | return -1; |
3420 | } | |
3421 | ||
8353b4c9 CB |
3422 | ret = lxc_create_tmp_proc_mount(lxc_conf); |
3423 | if (ret < 0) { | |
3424 | ERROR("Failed to \"/proc\" LSMs"); | |
e075f5d9 | 3425 | return -1; |
e075f5d9 | 3426 | } |
e075f5d9 | 3427 | |
8353b4c9 CB |
3428 | ret = setup_pivot_root(&lxc_conf->rootfs); |
3429 | if (ret < 0) { | |
3430 | ERROR("Failed to pivot root into rootfs"); | |
95b5ffaf | 3431 | return -1; |
ed502555 | 3432 | } |
3433 | ||
8353b4c9 CB |
3434 | ret = lxc_setup_devpts(lxc_conf); |
3435 | if (ret < 0) { | |
3436 | ERROR("Failed to setup new devpts instance"); | |
95b5ffaf | 3437 | return -1; |
3c26f34e | 3438 | } |
3439 | ||
2187efd3 CB |
3440 | ret = lxc_create_ttys(handler); |
3441 | if (ret < 0) | |
e8bd4e43 | 3442 | return -1; |
e8bd4e43 | 3443 | |
8353b4c9 CB |
3444 | ret = setup_personality(lxc_conf->personality); |
3445 | if (ret < 0) { | |
3446 | ERROR("Failed to set personality"); | |
cccc74b5 DL |
3447 | return -1; |
3448 | } | |
3449 | ||
8353b4c9 CB |
3450 | /* Set sysctl value to a path under /proc/sys as determined from the |
3451 | * key. For e.g. net.ipv4.ip_forward translated to | |
3452 | * /proc/sys/net/ipv4/ip_forward. | |
7edd0540 L |
3453 | */ |
3454 | if (!lxc_list_empty(&lxc_conf->sysctls)) { | |
3455 | ret = setup_sysctl_parameters(&lxc_conf->sysctls); | |
8353b4c9 CB |
3456 | if (ret < 0) { |
3457 | ERROR("Failed to setup sysctl parameters"); | |
7edd0540 | 3458 | return -1; |
8353b4c9 | 3459 | } |
7edd0540 L |
3460 | } |
3461 | ||
97a8f74f SG |
3462 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
3463 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
8353b4c9 CB |
3464 | ERROR("Container requests lxc.cap.drop and " |
3465 | "lxc.cap.keep: either use lxc.cap.drop or " | |
3466 | "lxc.cap.keep, not both"); | |
f6d3e3e4 SH |
3467 | return -1; |
3468 | } | |
8353b4c9 | 3469 | |
97a8f74f | 3470 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
8353b4c9 | 3471 | ERROR("Failed to keep capabilities"); |
97a8f74f SG |
3472 | return -1; |
3473 | } | |
3474 | } else if (setup_caps(&lxc_conf->caps)) { | |
8353b4c9 | 3475 | ERROR("Failed to drop capabilities"); |
97a8f74f | 3476 | return -1; |
81810dd1 DL |
3477 | } |
3478 | ||
8353b4c9 | 3479 | NOTICE("The container \"%s\" is set up", name); |
cd54d859 | 3480 | |
0ad19a3f | 3481 | return 0; |
3482 | } | |
26ddeedd | 3483 | |
3f60c2f7 | 3484 | int run_lxc_hooks(const char *name, char *hookname, struct lxc_conf *conf, |
14a7b0f9 | 3485 | char *argv[]) |
26ddeedd | 3486 | { |
26ddeedd | 3487 | struct lxc_list *it; |
3f60c2f7 | 3488 | int which = -1; |
26ddeedd | 3489 | |
3f60c2f7 | 3490 | if (strcmp(hookname, "pre-start") == 0) |
26ddeedd | 3491 | which = LXCHOOK_PRESTART; |
3f60c2f7 | 3492 | else if (strcmp(hookname, "start-host") == 0) |
08dd2805 | 3493 | which = LXCHOOK_START_HOST; |
3f60c2f7 | 3494 | else if (strcmp(hookname, "pre-mount") == 0) |
5ea6163a | 3495 | which = LXCHOOK_PREMOUNT; |
3f60c2f7 | 3496 | else if (strcmp(hookname, "mount") == 0) |
26ddeedd | 3497 | which = LXCHOOK_MOUNT; |
3f60c2f7 | 3498 | else if (strcmp(hookname, "autodev") == 0) |
f7bee6c6 | 3499 | which = LXCHOOK_AUTODEV; |
3f60c2f7 | 3500 | else if (strcmp(hookname, "start") == 0) |
26ddeedd | 3501 | which = LXCHOOK_START; |
3f60c2f7 | 3502 | else if (strcmp(hookname, "stop") == 0) |
52492063 | 3503 | which = LXCHOOK_STOP; |
3f60c2f7 | 3504 | else if (strcmp(hookname, "post-stop") == 0) |
26ddeedd | 3505 | which = LXCHOOK_POSTSTOP; |
3f60c2f7 | 3506 | else if (strcmp(hookname, "clone") == 0) |
148e91f5 | 3507 | which = LXCHOOK_CLONE; |
3f60c2f7 | 3508 | else if (strcmp(hookname, "destroy") == 0) |
37cf711b | 3509 | which = LXCHOOK_DESTROY; |
26ddeedd SH |
3510 | else |
3511 | return -1; | |
3f60c2f7 | 3512 | |
0fd73091 | 3513 | lxc_list_for_each (it, &conf->hooks[which]) { |
26ddeedd | 3514 | int ret; |
3f60c2f7 CB |
3515 | char *hook = it->elem; |
3516 | ||
3517 | ret = run_script_argv(name, conf->hooks_version, "lxc", hook, | |
14a7b0f9 | 3518 | hookname, argv); |
3f60c2f7 CB |
3519 | if (ret < 0) |
3520 | return -1; | |
26ddeedd | 3521 | } |
3f60c2f7 | 3522 | |
26ddeedd SH |
3523 | return 0; |
3524 | } | |
72d0e1cb | 3525 | |
72d0e1cb SG |
3526 | int lxc_clear_config_caps(struct lxc_conf *c) |
3527 | { | |
1a0e70ac | 3528 | struct lxc_list *it, *next; |
72d0e1cb | 3529 | |
0fd73091 | 3530 | lxc_list_for_each_safe (it, &c->caps, next) { |
72d0e1cb SG |
3531 | lxc_list_del(it); |
3532 | free(it->elem); | |
3533 | free(it); | |
3534 | } | |
0fd73091 | 3535 | |
72d0e1cb SG |
3536 | return 0; |
3537 | } | |
3538 | ||
c7e345ae CB |
3539 | static int lxc_free_idmap(struct lxc_list *id_map) |
3540 | { | |
27c27d73 SH |
3541 | struct lxc_list *it, *next; |
3542 | ||
0fd73091 | 3543 | lxc_list_for_each_safe (it, id_map, next) { |
27c27d73 SH |
3544 | lxc_list_del(it); |
3545 | free(it->elem); | |
3546 | free(it); | |
3547 | } | |
c7e345ae | 3548 | |
27c27d73 SH |
3549 | return 0; |
3550 | } | |
3551 | ||
4355ab5f SH |
3552 | int lxc_clear_idmaps(struct lxc_conf *c) |
3553 | { | |
3554 | return lxc_free_idmap(&c->id_map); | |
3555 | } | |
3556 | ||
1fb86a7c SH |
3557 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
3558 | { | |
0fd73091 | 3559 | struct lxc_list *it, *next; |
1fb86a7c | 3560 | |
0fd73091 | 3561 | lxc_list_for_each_safe (it, &c->keepcaps, next) { |
1fb86a7c SH |
3562 | lxc_list_del(it); |
3563 | free(it->elem); | |
3564 | free(it); | |
3565 | } | |
0fd73091 | 3566 | |
1fb86a7c SH |
3567 | return 0; |
3568 | } | |
3569 | ||
54860ed0 | 3570 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version) |
72d0e1cb | 3571 | { |
54860ed0 | 3572 | char *global_token, *namespaced_token; |
ab1a6cac | 3573 | size_t namespaced_token_len; |
54860ed0 | 3574 | struct lxc_list *it, *next, *list; |
ab1a6cac | 3575 | const char *k = key; |
54860ed0 | 3576 | bool all = false; |
72d0e1cb | 3577 | |
54860ed0 CB |
3578 | if (version == CGROUP2_SUPER_MAGIC) { |
3579 | global_token = "lxc.cgroup2"; | |
3580 | namespaced_token = "lxc.cgroup2."; | |
0fd73091 | 3581 | namespaced_token_len = sizeof("lxc.cgroup2.") - 1; |
54860ed0 CB |
3582 | list = &c->cgroup2; |
3583 | } else if (version == CGROUP_SUPER_MAGIC) { | |
3584 | global_token = "lxc.cgroup"; | |
3585 | namespaced_token = "lxc.cgroup."; | |
0fd73091 | 3586 | namespaced_token_len = sizeof("lxc.cgroup.") - 1; |
54860ed0 CB |
3587 | list = &c->cgroup; |
3588 | } else { | |
ab1a6cac | 3589 | return -EINVAL; |
54860ed0 CB |
3590 | } |
3591 | ||
3592 | if (strcmp(key, global_token) == 0) | |
72d0e1cb | 3593 | all = true; |
54860ed0 | 3594 | else if (strncmp(key, namespaced_token, sizeof(namespaced_token) - 1) == 0) |
ab1a6cac | 3595 | k += namespaced_token_len; |
a6390f01 | 3596 | else |
ab1a6cac | 3597 | return -EINVAL; |
72d0e1cb | 3598 | |
0fd73091 | 3599 | lxc_list_for_each_safe (it, list, next) { |
72d0e1cb | 3600 | struct lxc_cgroup *cg = it->elem; |
54860ed0 | 3601 | |
72d0e1cb SG |
3602 | if (!all && strcmp(cg->subsystem, k) != 0) |
3603 | continue; | |
54860ed0 | 3604 | |
72d0e1cb SG |
3605 | lxc_list_del(it); |
3606 | free(cg->subsystem); | |
3607 | free(cg->value); | |
3608 | free(cg); | |
3609 | free(it); | |
3610 | } | |
e409b214 | 3611 | |
72d0e1cb SG |
3612 | return 0; |
3613 | } | |
3614 | ||
c6d09e15 WB |
3615 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
3616 | { | |
3617 | struct lxc_list *it, *next; | |
c6d09e15 | 3618 | const char *k = NULL; |
0fd73091 | 3619 | bool all = false; |
c6d09e15 | 3620 | |
b668653c | 3621 | if (strcmp(key, "lxc.limit") == 0 || strcmp(key, "lxc.prlimit") == 0) |
c6d09e15 | 3622 | all = true; |
b668653c CB |
3623 | else if (strncmp(key, "lxc.limit.", sizeof("lxc.limit.") - 1) == 0) |
3624 | k = key + sizeof("lxc.limit.") - 1; | |
3625 | else if (strncmp(key, "lxc.prlimit.", sizeof("lxc.prlimit.") - 1) == 0) | |
3626 | k = key + sizeof("lxc.prlimit.") - 1; | |
c6d09e15 WB |
3627 | else |
3628 | return -1; | |
3629 | ||
0fd73091 | 3630 | lxc_list_for_each_safe (it, &c->limits, next) { |
c6d09e15 | 3631 | struct lxc_limit *lim = it->elem; |
0fd73091 | 3632 | |
c6d09e15 WB |
3633 | if (!all && strcmp(lim->resource, k) != 0) |
3634 | continue; | |
0fd73091 | 3635 | |
c6d09e15 WB |
3636 | lxc_list_del(it); |
3637 | free(lim->resource); | |
3638 | free(lim); | |
3639 | free(it); | |
3640 | } | |
b668653c | 3641 | |
c6d09e15 WB |
3642 | return 0; |
3643 | } | |
3644 | ||
7edd0540 L |
3645 | int lxc_clear_sysctls(struct lxc_conf *c, const char *key) |
3646 | { | |
3647 | struct lxc_list *it, *next; | |
7edd0540 | 3648 | const char *k = NULL; |
0fd73091 | 3649 | bool all = false; |
7edd0540 L |
3650 | |
3651 | if (strcmp(key, "lxc.sysctl") == 0) | |
3652 | all = true; | |
3653 | else if (strncmp(key, "lxc.sysctl.", sizeof("lxc.sysctl.") - 1) == 0) | |
3654 | k = key + sizeof("lxc.sysctl.") - 1; | |
3655 | else | |
3656 | return -1; | |
3657 | ||
0fd73091 | 3658 | lxc_list_for_each_safe (it, &c->sysctls, next) { |
7edd0540 | 3659 | struct lxc_sysctl *elem = it->elem; |
0fd73091 | 3660 | |
7edd0540 L |
3661 | if (!all && strcmp(elem->key, k) != 0) |
3662 | continue; | |
0fd73091 | 3663 | |
7edd0540 L |
3664 | lxc_list_del(it); |
3665 | free(elem->key); | |
3666 | free(elem->value); | |
3667 | free(elem); | |
3668 | free(it); | |
3669 | } | |
0fd73091 | 3670 | |
7edd0540 L |
3671 | return 0; |
3672 | } | |
3673 | ||
61d7a733 YT |
3674 | int lxc_clear_procs(struct lxc_conf *c, const char *key) |
3675 | { | |
0fd73091 | 3676 | struct lxc_list *it, *next; |
61d7a733 | 3677 | const char *k = NULL; |
0fd73091 | 3678 | bool all = false; |
61d7a733 YT |
3679 | |
3680 | if (strcmp(key, "lxc.proc") == 0) | |
3681 | all = true; | |
3682 | else if (strncmp(key, "lxc.proc.", sizeof("lxc.proc.") - 1) == 0) | |
3683 | k = key + sizeof("lxc.proc.") - 1; | |
3684 | else | |
3685 | return -1; | |
3686 | ||
0fd73091 | 3687 | lxc_list_for_each_safe (it, &c->procs, next) { |
61d7a733 | 3688 | struct lxc_proc *proc = it->elem; |
0fd73091 | 3689 | |
61d7a733 YT |
3690 | if (!all && strcmp(proc->filename, k) != 0) |
3691 | continue; | |
0fd73091 | 3692 | |
61d7a733 YT |
3693 | lxc_list_del(it); |
3694 | free(proc->filename); | |
3695 | free(proc->value); | |
3696 | free(proc); | |
3697 | free(it); | |
3698 | } | |
3699 | ||
3700 | return 0; | |
3701 | } | |
3702 | ||
ee1e7aa0 SG |
3703 | int lxc_clear_groups(struct lxc_conf *c) |
3704 | { | |
0fd73091 | 3705 | struct lxc_list *it, *next; |
ee1e7aa0 | 3706 | |
0fd73091 | 3707 | lxc_list_for_each_safe (it, &c->groups, next) { |
ee1e7aa0 SG |
3708 | lxc_list_del(it); |
3709 | free(it->elem); | |
3710 | free(it); | |
3711 | } | |
0fd73091 | 3712 | |
ee1e7aa0 SG |
3713 | return 0; |
3714 | } | |
3715 | ||
ab799c0b SG |
3716 | int lxc_clear_environment(struct lxc_conf *c) |
3717 | { | |
0fd73091 | 3718 | struct lxc_list *it, *next; |
ab799c0b | 3719 | |
0fd73091 | 3720 | lxc_list_for_each_safe (it, &c->environment, next) { |
ab799c0b SG |
3721 | lxc_list_del(it); |
3722 | free(it->elem); | |
3723 | free(it); | |
3724 | } | |
0fd73091 | 3725 | |
ab799c0b SG |
3726 | return 0; |
3727 | } | |
3728 | ||
72d0e1cb SG |
3729 | int lxc_clear_mount_entries(struct lxc_conf *c) |
3730 | { | |
0fd73091 | 3731 | struct lxc_list *it, *next; |
72d0e1cb | 3732 | |
0fd73091 | 3733 | lxc_list_for_each_safe (it, &c->mount_list, next) { |
72d0e1cb SG |
3734 | lxc_list_del(it); |
3735 | free(it->elem); | |
3736 | free(it); | |
3737 | } | |
0fd73091 | 3738 | |
72d0e1cb SG |
3739 | return 0; |
3740 | } | |
3741 | ||
b099e9e9 SH |
3742 | int lxc_clear_automounts(struct lxc_conf *c) |
3743 | { | |
3744 | c->auto_mounts = 0; | |
3745 | return 0; | |
3746 | } | |
3747 | ||
12a50cc6 | 3748 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 3749 | { |
72d0e1cb | 3750 | int i; |
0fd73091 CB |
3751 | struct lxc_list *it, *next; |
3752 | const char *k = NULL; | |
3753 | bool all = false, done = false; | |
72d0e1cb | 3754 | |
17ed13a3 SH |
3755 | if (strcmp(key, "lxc.hook") == 0) |
3756 | all = true; | |
0fd73091 CB |
3757 | else if (strncmp(key, "lxc.hook.", sizeof("lxc.hook.") - 1) == 0) |
3758 | k = key + sizeof("lxc.hook.") - 1; | |
a6390f01 WB |
3759 | else |
3760 | return -1; | |
17ed13a3 | 3761 | |
0fd73091 | 3762 | for (i = 0; i < NUM_LXC_HOOKS; i++) { |
17ed13a3 | 3763 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
0fd73091 | 3764 | lxc_list_for_each_safe (it, &c->hooks[i], next) { |
17ed13a3 SH |
3765 | lxc_list_del(it); |
3766 | free(it->elem); | |
3767 | free(it); | |
3768 | } | |
0fd73091 | 3769 | |
17ed13a3 | 3770 | done = true; |
72d0e1cb SG |
3771 | } |
3772 | } | |
17ed13a3 SH |
3773 | |
3774 | if (!done) { | |
3775 | ERROR("Invalid hook key: %s", key); | |
3776 | return -1; | |
3777 | } | |
0fd73091 | 3778 | |
72d0e1cb SG |
3779 | return 0; |
3780 | } | |
8eb5694b | 3781 | |
4184c3e1 SH |
3782 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
3783 | { | |
0fd73091 | 3784 | struct lxc_list *it, *next; |
4184c3e1 | 3785 | |
0fd73091 | 3786 | lxc_list_for_each_safe (it, &conf->aliens, next) { |
4184c3e1 SH |
3787 | lxc_list_del(it); |
3788 | free(it->elem); | |
3789 | free(it); | |
3790 | } | |
3791 | } | |
3792 | ||
c7b15d1e | 3793 | void lxc_clear_includes(struct lxc_conf *conf) |
f979ac15 | 3794 | { |
0fd73091 | 3795 | struct lxc_list *it, *next; |
f979ac15 | 3796 | |
0fd73091 | 3797 | lxc_list_for_each_safe (it, &conf->includes, next) { |
f979ac15 SH |
3798 | lxc_list_del(it); |
3799 | free(it->elem); | |
3800 | free(it); | |
3801 | } | |
3802 | } | |
3803 | ||
8eb5694b SH |
3804 | void lxc_conf_free(struct lxc_conf *conf) |
3805 | { | |
3806 | if (!conf) | |
3807 | return; | |
0fd73091 | 3808 | |
858377e4 SH |
3809 | if (current_config == conf) |
3810 | current_config = NULL; | |
aed105d5 | 3811 | lxc_terminal_conf_free(&conf->console); |
f10fad2f | 3812 | free(conf->rootfs.mount); |
b3b8c97f | 3813 | free(conf->rootfs.bdev_type); |
f10fad2f ME |
3814 | free(conf->rootfs.options); |
3815 | free(conf->rootfs.path); | |
f10fad2f | 3816 | free(conf->logfile); |
858377e4 SH |
3817 | if (conf->logfd != -1) |
3818 | close(conf->logfd); | |
f10fad2f ME |
3819 | free(conf->utsname); |
3820 | free(conf->ttydir); | |
3821 | free(conf->fstab); | |
3822 | free(conf->rcfile); | |
5cda27c1 | 3823 | free(conf->execute_cmd); |
f10fad2f | 3824 | free(conf->init_cmd); |
3c491553 | 3825 | free(conf->init_cwd); |
6b0d5538 | 3826 | free(conf->unexpanded_config); |
393903d1 | 3827 | free(conf->pty_names); |
76d0127f | 3828 | free(conf->syslog); |
c302b476 | 3829 | lxc_free_networks(&conf->network); |
f10fad2f ME |
3830 | free(conf->lsm_aa_profile); |
3831 | free(conf->lsm_se_context); | |
769872f9 | 3832 | lxc_seccomp_free(conf); |
8eb5694b | 3833 | lxc_clear_config_caps(conf); |
1fb86a7c | 3834 | lxc_clear_config_keepcaps(conf); |
54860ed0 CB |
3835 | lxc_clear_cgroups(conf, "lxc.cgroup", CGROUP_SUPER_MAGIC); |
3836 | lxc_clear_cgroups(conf, "lxc.cgroup2", CGROUP2_SUPER_MAGIC); | |
17ed13a3 | 3837 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 3838 | lxc_clear_mount_entries(conf); |
27c27d73 | 3839 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 3840 | lxc_clear_groups(conf); |
f979ac15 | 3841 | lxc_clear_includes(conf); |
761d81ca | 3842 | lxc_clear_aliens(conf); |
ab799c0b | 3843 | lxc_clear_environment(conf); |
240d4b74 | 3844 | lxc_clear_limits(conf, "lxc.prlimit"); |
7edd0540 | 3845 | lxc_clear_sysctls(conf, "lxc.sysctl"); |
61d7a733 | 3846 | lxc_clear_procs(conf, "lxc.proc"); |
43654d34 CB |
3847 | free(conf->cgroup_meta.dir); |
3848 | free(conf->cgroup_meta.controllers); | |
8eb5694b SH |
3849 | free(conf); |
3850 | } | |
4355ab5f SH |
3851 | |
3852 | struct userns_fn_data { | |
3853 | int (*fn)(void *); | |
c9b7c33e | 3854 | const char *fn_name; |
4355ab5f SH |
3855 | void *arg; |
3856 | int p[2]; | |
3857 | }; | |
3858 | ||
3859 | static int run_userns_fn(void *data) | |
3860 | { | |
4355ab5f | 3861 | char c; |
0fd73091 | 3862 | struct userns_fn_data *d = data; |
4355ab5f | 3863 | |
f8aa4bf3 | 3864 | /* Close write end of the pipe. */ |
4355ab5f | 3865 | close(d->p[1]); |
f8aa4bf3 CB |
3866 | |
3867 | /* Wait for parent to finish establishing a new mapping in the user | |
3868 | * namespace we are executing in. | |
3869 | */ | |
4355ab5f SH |
3870 | if (read(d->p[0], &c, 1) != 1) |
3871 | return -1; | |
f8aa4bf3 CB |
3872 | |
3873 | /* Close read end of the pipe. */ | |
4355ab5f | 3874 | close(d->p[0]); |
f8aa4bf3 | 3875 | |
c9b7c33e CB |
3876 | if (d->fn_name) |
3877 | TRACE("calling function \"%s\"", d->fn_name); | |
0fd73091 | 3878 | |
f8aa4bf3 | 3879 | /* Call function to run. */ |
4355ab5f SH |
3880 | return d->fn(d->arg); |
3881 | } | |
3882 | ||
db7cfe23 CB |
3883 | static struct id_map *mapped_nsid_add(struct lxc_conf *conf, unsigned id, |
3884 | enum idtype idtype) | |
3885 | { | |
3886 | struct id_map *map, *retmap; | |
3887 | ||
3888 | map = find_mapped_nsid_entry(conf, id, idtype); | |
3889 | if (!map) | |
3890 | return NULL; | |
3891 | ||
3892 | retmap = malloc(sizeof(*retmap)); | |
3893 | if (!retmap) | |
3894 | return NULL; | |
3895 | ||
3896 | memcpy(retmap, map, sizeof(*retmap)); | |
3897 | return retmap; | |
3898 | } | |
3899 | ||
c4333195 CB |
3900 | static struct id_map *find_mapped_hostid_entry(struct lxc_conf *conf, |
3901 | unsigned id, enum idtype idtype) | |
f8aa4bf3 | 3902 | { |
f8aa4bf3 | 3903 | struct id_map *map; |
0fd73091 | 3904 | struct lxc_list *it; |
f8aa4bf3 CB |
3905 | struct id_map *retmap = NULL; |
3906 | ||
0fd73091 | 3907 | lxc_list_for_each (it, &conf->id_map) { |
f8aa4bf3 CB |
3908 | map = it->elem; |
3909 | if (map->idtype != idtype) | |
3910 | continue; | |
3911 | ||
3912 | if (id >= map->hostid && id < map->hostid + map->range) { | |
3913 | retmap = map; | |
3914 | break; | |
3915 | } | |
3916 | } | |
3917 | ||
f8aa4bf3 CB |
3918 | return retmap; |
3919 | } | |
3920 | ||
0fd73091 | 3921 | /* Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
f8aa4bf3 | 3922 | * existing one or establish a new one. |
4355ab5f | 3923 | */ |
0fd73091 CB |
3924 | static struct id_map *mapped_hostid_add(struct lxc_conf *conf, uid_t id, |
3925 | enum idtype type) | |
4355ab5f | 3926 | { |
28a2d9e7 | 3927 | int hostid_mapped; |
c4333195 CB |
3928 | struct id_map *entry = NULL, *tmp = NULL; |
3929 | ||
3930 | entry = malloc(sizeof(*entry)); | |
3931 | if (!entry) | |
3932 | return NULL; | |
f8aa4bf3 | 3933 | |
28a2d9e7 | 3934 | /* Reuse existing mapping. */ |
c4333195 CB |
3935 | tmp = find_mapped_hostid_entry(conf, id, type); |
3936 | if (tmp) | |
3937 | return memcpy(entry, tmp, sizeof(*entry)); | |
f8aa4bf3 | 3938 | |
28a2d9e7 CB |
3939 | /* Find new mapping. */ |
3940 | hostid_mapped = find_unmapped_nsid(conf, type); | |
3941 | if (hostid_mapped < 0) { | |
c4333195 CB |
3942 | DEBUG("Failed to find free mapping for id %d", id); |
3943 | free(entry); | |
28a2d9e7 | 3944 | return NULL; |
f8aa4bf3 | 3945 | } |
f8aa4bf3 | 3946 | |
28a2d9e7 CB |
3947 | entry->idtype = type; |
3948 | entry->nsid = hostid_mapped; | |
3949 | entry->hostid = (unsigned long)id; | |
3950 | entry->range = 1; | |
4355ab5f | 3951 | |
28a2d9e7 | 3952 | return entry; |
4355ab5f SH |
3953 | } |
3954 | ||
dcf0ffdf | 3955 | struct lxc_list *get_minimal_idmap(struct lxc_conf *conf) |
4355ab5f | 3956 | { |
f8aa4bf3 | 3957 | uid_t euid, egid; |
4160c3a0 CB |
3958 | uid_t nsuid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; |
3959 | gid_t nsgid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
f8aa4bf3 | 3960 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
28a2d9e7 CB |
3961 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, |
3962 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4355ab5f | 3963 | |
db7cfe23 | 3964 | /* Find container root mappings. */ |
4160c3a0 | 3965 | container_root_uid = mapped_nsid_add(conf, nsuid, ID_TYPE_UID); |
db7cfe23 | 3966 | if (!container_root_uid) { |
dcf0ffdf | 3967 | DEBUG("Failed to find mapping for namespace uid %d", 0); |
db7cfe23 | 3968 | goto on_error; |
f8aa4bf3 | 3969 | } |
dcf0ffdf CB |
3970 | euid = geteuid(); |
3971 | if (euid >= container_root_uid->hostid && | |
3972 | euid < (container_root_uid->hostid + container_root_uid->range)) | |
db7cfe23 | 3973 | host_uid_map = container_root_uid; |
f8aa4bf3 | 3974 | |
4160c3a0 | 3975 | container_root_gid = mapped_nsid_add(conf, nsgid, ID_TYPE_GID); |
db7cfe23 | 3976 | if (!container_root_gid) { |
dcf0ffdf | 3977 | DEBUG("Failed to find mapping for namespace gid %d", 0); |
f8aa4bf3 CB |
3978 | goto on_error; |
3979 | } | |
dcf0ffdf CB |
3980 | egid = getegid(); |
3981 | if (egid >= container_root_gid->hostid && | |
3982 | egid < (container_root_gid->hostid + container_root_gid->range)) | |
db7cfe23 | 3983 | host_gid_map = container_root_gid; |
f8aa4bf3 CB |
3984 | |
3985 | /* Check whether the {g,u}id of the user has a mapping. */ | |
954b7d9b | 3986 | if (!host_uid_map) |
c4333195 | 3987 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
28a2d9e7 | 3988 | if (!host_uid_map) { |
db7cfe23 | 3989 | DEBUG("Failed to find mapping for uid %d", euid); |
f8aa4bf3 CB |
3990 | goto on_error; |
3991 | } | |
3992 | ||
dcf0ffdf CB |
3993 | if (!host_gid_map) |
3994 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); | |
28a2d9e7 | 3995 | if (!host_gid_map) { |
db7cfe23 | 3996 | DEBUG("Failed to find mapping for gid %d", egid); |
28a2d9e7 CB |
3997 | goto on_error; |
3998 | } | |
3999 | ||
4000 | /* Allocate new {g,u}id map list. */ | |
4001 | idmap = malloc(sizeof(*idmap)); | |
4002 | if (!idmap) | |
4003 | goto on_error; | |
4004 | lxc_list_init(idmap); | |
4005 | ||
f8aa4bf3 CB |
4006 | /* Add container root to the map. */ |
4007 | tmplist = malloc(sizeof(*tmplist)); | |
4008 | if (!tmplist) | |
4009 | goto on_error; | |
4010 | lxc_list_add_elem(tmplist, container_root_uid); | |
4011 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4012 | |
1d90e064 | 4013 | if (host_uid_map && (host_uid_map != container_root_uid)) { |
28a2d9e7 CB |
4014 | /* idmap will now keep track of that memory. */ |
4015 | container_root_uid = NULL; | |
4016 | ||
4017 | /* Add container root to the map. */ | |
4018 | tmplist = malloc(sizeof(*tmplist)); | |
4019 | if (!tmplist) | |
4020 | goto on_error; | |
4021 | lxc_list_add_elem(tmplist, host_uid_map); | |
4022 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4023 | } |
1d90e064 CB |
4024 | /* idmap will now keep track of that memory. */ |
4025 | container_root_uid = NULL; | |
4026 | /* idmap will now keep track of that memory. */ | |
4027 | host_uid_map = NULL; | |
f8aa4bf3 CB |
4028 | |
4029 | tmplist = malloc(sizeof(*tmplist)); | |
4030 | if (!tmplist) | |
4031 | goto on_error; | |
4032 | lxc_list_add_elem(tmplist, container_root_gid); | |
4033 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4034 | |
1d90e064 | 4035 | if (host_gid_map && (host_gid_map != container_root_gid)) { |
28a2d9e7 CB |
4036 | /* idmap will now keep track of that memory. */ |
4037 | container_root_gid = NULL; | |
4038 | ||
4039 | tmplist = malloc(sizeof(*tmplist)); | |
4040 | if (!tmplist) | |
4041 | goto on_error; | |
4042 | lxc_list_add_elem(tmplist, host_gid_map); | |
4043 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4044 | } |
1d90e064 CB |
4045 | /* idmap will now keep track of that memory. */ |
4046 | container_root_gid = NULL; | |
4047 | /* idmap will now keep track of that memory. */ | |
4048 | host_gid_map = NULL; | |
f8aa4bf3 | 4049 | |
dcf0ffdf CB |
4050 | TRACE("Allocated minimal idmapping"); |
4051 | return idmap; | |
4052 | ||
4053 | on_error: | |
4054 | if (idmap) | |
4055 | lxc_free_idmap(idmap); | |
4056 | if (container_root_uid) | |
4057 | free(container_root_uid); | |
4058 | if (container_root_gid) | |
4059 | free(container_root_gid); | |
4060 | if (host_uid_map && (host_uid_map != container_root_uid)) | |
4061 | free(host_uid_map); | |
4062 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4063 | free(host_gid_map); | |
4064 | ||
4065 | return NULL; | |
4066 | } | |
4067 | ||
4068 | /* Run a function in a new user namespace. | |
4069 | * The caller's euid/egid will be mapped if it is not already. | |
4070 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
4071 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
4072 | * This means we require only to establish a mapping from: | |
4073 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
4074 | * - the container root -> some sub{g,u}id | |
4075 | * The former we add, if the user did not specifiy a mapping. The latter we | |
4076 | * retrieve from the ontainer's configured {g,u}id mappings as it must have been | |
4077 | * there to start the container in the first place. | |
4078 | */ | |
4079 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data, | |
4080 | const char *fn_name) | |
4081 | { | |
4082 | pid_t pid; | |
dcf0ffdf | 4083 | int p[2]; |
0fd73091 | 4084 | struct userns_fn_data d; |
dcf0ffdf | 4085 | struct lxc_list *idmap; |
0fd73091 CB |
4086 | int ret = -1, status = -1; |
4087 | char c = '1'; | |
dcf0ffdf CB |
4088 | |
4089 | idmap = get_minimal_idmap(conf); | |
4090 | if (!idmap) | |
4091 | return -1; | |
4092 | ||
4093 | ret = pipe(p); | |
4094 | if (ret < 0) { | |
4095 | SYSERROR("Failed to create pipe"); | |
4096 | return -1; | |
4097 | } | |
4098 | d.fn = fn; | |
4099 | d.fn_name = fn_name; | |
4100 | d.arg = data; | |
4101 | d.p[0] = p[0]; | |
4102 | d.p[1] = p[1]; | |
4103 | ||
4104 | /* Clone child in new user namespace. */ | |
4105 | pid = lxc_raw_clone_cb(run_userns_fn, &d, CLONE_NEWUSER); | |
4106 | if (pid < 0) { | |
0fd73091 | 4107 | ERROR("Failed to clone process in new user namespace"); |
dcf0ffdf CB |
4108 | goto on_error; |
4109 | } | |
4110 | ||
4111 | close(p[0]); | |
4112 | p[0] = -1; | |
4113 | ||
4b73005c CB |
4114 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || |
4115 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
dcf0ffdf | 4116 | struct id_map *map; |
0fd73091 | 4117 | struct lxc_list *it; |
dcf0ffdf | 4118 | |
0fd73091 | 4119 | lxc_list_for_each (it, idmap) { |
f8aa4bf3 | 4120 | map = it->elem; |
dcf0ffdf | 4121 | TRACE("Establishing %cid mapping for \"%d\" in new " |
f8aa4bf3 | 4122 | "user namespace: nsuid %lu - hostid %lu - range " |
0fd73091 CB |
4123 | "%lu", |
4124 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4125 | map->nsid, map->hostid, map->range); | |
f8aa4bf3 | 4126 | } |
4355ab5f SH |
4127 | } |
4128 | ||
f8aa4bf3 | 4129 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 4130 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 | 4131 | if (ret < 0) { |
0fd73091 | 4132 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); |
f8aa4bf3 | 4133 | goto on_error; |
4355ab5f SH |
4134 | } |
4135 | ||
f8aa4bf3 | 4136 | /* Tell child to proceed. */ |
4355ab5f | 4137 | if (write(p[1], &c, 1) != 1) { |
dcf0ffdf | 4138 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
f8aa4bf3 | 4139 | goto on_error; |
4355ab5f SH |
4140 | } |
4141 | ||
686dd5d1 | 4142 | on_error: |
4355ab5f SH |
4143 | if (p[0] != -1) |
4144 | close(p[0]); | |
4145 | close(p[1]); | |
f8aa4bf3 | 4146 | |
ee1b16bc TA |
4147 | /* Wait for child to finish. */ |
4148 | if (pid > 0) | |
4149 | status = wait_for_pid(pid); | |
4150 | ||
686dd5d1 CB |
4151 | if (status < 0) |
4152 | ret = -1; | |
4153 | ||
f8aa4bf3 | 4154 | return ret; |
4355ab5f | 4155 | } |
97e9cfa0 | 4156 | |
415a8851 CB |
4157 | int userns_exec_full(struct lxc_conf *conf, int (*fn)(void *), void *data, |
4158 | const char *fn_name) | |
4159 | { | |
4160 | pid_t pid; | |
4161 | uid_t euid, egid; | |
415a8851 CB |
4162 | int p[2]; |
4163 | struct id_map *map; | |
4164 | struct lxc_list *cur; | |
0fd73091 | 4165 | struct userns_fn_data d; |
415a8851 | 4166 | int ret = -1; |
0fd73091 | 4167 | char c = '1'; |
415a8851 CB |
4168 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
4169 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, | |
4170 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4171 | ||
4172 | ret = pipe(p); | |
4173 | if (ret < 0) { | |
4174 | SYSERROR("opening pipe"); | |
4175 | return -1; | |
4176 | } | |
4177 | d.fn = fn; | |
4178 | d.fn_name = fn_name; | |
4179 | d.arg = data; | |
4180 | d.p[0] = p[0]; | |
4181 | d.p[1] = p[1]; | |
4182 | ||
4183 | /* Clone child in new user namespace. */ | |
4184 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER); | |
4185 | if (pid < 0) { | |
0fd73091 | 4186 | ERROR("Failed to clone process in new user namespace"); |
415a8851 CB |
4187 | goto on_error; |
4188 | } | |
4189 | ||
4190 | close(p[0]); | |
4191 | p[0] = -1; | |
4192 | ||
4193 | euid = geteuid(); | |
4194 | egid = getegid(); | |
4195 | ||
4196 | /* Allocate new {g,u}id map list. */ | |
4197 | idmap = malloc(sizeof(*idmap)); | |
4198 | if (!idmap) | |
4199 | goto on_error; | |
4200 | lxc_list_init(idmap); | |
4201 | ||
4202 | /* Find container root. */ | |
0fd73091 | 4203 | lxc_list_for_each (cur, &conf->id_map) { |
415a8851 CB |
4204 | struct id_map *tmpmap; |
4205 | ||
4206 | tmplist = malloc(sizeof(*tmplist)); | |
4207 | if (!tmplist) | |
4208 | goto on_error; | |
4209 | ||
4210 | tmpmap = malloc(sizeof(*tmpmap)); | |
4211 | if (!tmpmap) { | |
4212 | free(tmplist); | |
4213 | goto on_error; | |
4214 | } | |
4215 | ||
4216 | memset(tmpmap, 0, sizeof(*tmpmap)); | |
4217 | memcpy(tmpmap, cur->elem, sizeof(*tmpmap)); | |
4218 | tmplist->elem = tmpmap; | |
4219 | ||
4220 | lxc_list_add_tail(idmap, tmplist); | |
4221 | ||
4222 | map = cur->elem; | |
4223 | ||
4224 | if (map->idtype == ID_TYPE_UID) | |
4225 | if (euid >= map->hostid && euid < map->hostid + map->range) | |
4226 | host_uid_map = map; | |
4227 | ||
4228 | if (map->idtype == ID_TYPE_GID) | |
4229 | if (egid >= map->hostid && egid < map->hostid + map->range) | |
4230 | host_gid_map = map; | |
4231 | ||
4232 | if (map->nsid != 0) | |
4233 | continue; | |
4234 | ||
4235 | if (map->idtype == ID_TYPE_UID) | |
4236 | if (container_root_uid == NULL) | |
4237 | container_root_uid = map; | |
4238 | ||
4239 | if (map->idtype == ID_TYPE_GID) | |
4240 | if (container_root_gid == NULL) | |
4241 | container_root_gid = map; | |
4242 | } | |
4243 | ||
4244 | if (!container_root_uid || !container_root_gid) { | |
4245 | ERROR("No mapping for container root found"); | |
4246 | goto on_error; | |
4247 | } | |
4248 | ||
4249 | /* Check whether the {g,u}id of the user has a mapping. */ | |
4250 | if (!host_uid_map) | |
c4333195 | 4251 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
415a8851 CB |
4252 | else |
4253 | host_uid_map = container_root_uid; | |
4254 | ||
4255 | if (!host_gid_map) | |
c4333195 | 4256 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); |
415a8851 CB |
4257 | else |
4258 | host_gid_map = container_root_gid; | |
4259 | ||
4260 | if (!host_uid_map) { | |
4261 | DEBUG("Failed to find mapping for uid %d", euid); | |
4262 | goto on_error; | |
4263 | } | |
4264 | ||
4265 | if (!host_gid_map) { | |
4266 | DEBUG("Failed to find mapping for gid %d", egid); | |
4267 | goto on_error; | |
4268 | } | |
4269 | ||
4270 | if (host_uid_map && (host_uid_map != container_root_uid)) { | |
4271 | /* Add container root to the map. */ | |
4272 | tmplist = malloc(sizeof(*tmplist)); | |
4273 | if (!tmplist) | |
4274 | goto on_error; | |
4275 | lxc_list_add_elem(tmplist, host_uid_map); | |
4276 | lxc_list_add_tail(idmap, tmplist); | |
4277 | } | |
4278 | /* idmap will now keep track of that memory. */ | |
4279 | host_uid_map = NULL; | |
4280 | ||
4281 | if (host_gid_map && (host_gid_map != container_root_gid)) { | |
4282 | tmplist = malloc(sizeof(*tmplist)); | |
4283 | if (!tmplist) | |
4284 | goto on_error; | |
4285 | lxc_list_add_elem(tmplist, host_gid_map); | |
4286 | lxc_list_add_tail(idmap, tmplist); | |
4287 | } | |
4288 | /* idmap will now keep track of that memory. */ | |
4289 | host_gid_map = NULL; | |
4290 | ||
4291 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || | |
4292 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
0fd73091 | 4293 | lxc_list_for_each (cur, idmap) { |
415a8851 CB |
4294 | map = cur->elem; |
4295 | TRACE("establishing %cid mapping for \"%d\" in new " | |
4296 | "user namespace: nsuid %lu - hostid %lu - range " | |
4297 | "%lu", | |
4298 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4299 | map->nsid, map->hostid, map->range); | |
4300 | } | |
4301 | } | |
4302 | ||
4303 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
4304 | ret = lxc_map_ids(idmap, pid); | |
4305 | if (ret < 0) { | |
0fd73091 | 4306 | ERROR("error setting up {g,u}id mappings for child process \"%d\"", pid); |
415a8851 CB |
4307 | goto on_error; |
4308 | } | |
4309 | ||
4310 | /* Tell child to proceed. */ | |
4311 | if (write(p[1], &c, 1) != 1) { | |
0fd73091 | 4312 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
415a8851 CB |
4313 | goto on_error; |
4314 | } | |
4315 | ||
686dd5d1 | 4316 | on_error: |
ee1b16bc TA |
4317 | if (p[0] != -1) |
4318 | close(p[0]); | |
4319 | close(p[1]); | |
4320 | ||
415a8851 | 4321 | /* Wait for child to finish. */ |
686dd5d1 CB |
4322 | if (pid > 0) |
4323 | ret = wait_for_pid(pid); | |
415a8851 | 4324 | |
415a8851 CB |
4325 | if (idmap) |
4326 | lxc_free_idmap(idmap); | |
4327 | if (host_uid_map && (host_uid_map != container_root_uid)) | |
4328 | free(host_uid_map); | |
4329 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4330 | free(host_gid_map); | |
4331 | ||
415a8851 CB |
4332 | return ret; |
4333 | } | |
4334 | ||
a96a8e8c | 4335 | /* not thread-safe, do not use from api without first forking */ |
0fd73091 | 4336 | static char *getuname(void) |
97e9cfa0 | 4337 | { |
a96a8e8c | 4338 | struct passwd *result; |
97e9cfa0 | 4339 | |
a96a8e8c SH |
4340 | result = getpwuid(geteuid()); |
4341 | if (!result) | |
97e9cfa0 SH |
4342 | return NULL; |
4343 | ||
a96a8e8c | 4344 | return strdup(result->pw_name); |
97e9cfa0 SH |
4345 | } |
4346 | ||
a96a8e8c | 4347 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4348 | static char *getgname(void) |
4349 | { | |
a96a8e8c | 4350 | struct group *result; |
97e9cfa0 | 4351 | |
a96a8e8c SH |
4352 | result = getgrgid(getegid()); |
4353 | if (!result) | |
97e9cfa0 SH |
4354 | return NULL; |
4355 | ||
a96a8e8c | 4356 | return strdup(result->gr_name); |
97e9cfa0 SH |
4357 | } |
4358 | ||
a96a8e8c | 4359 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4360 | void suggest_default_idmap(void) |
4361 | { | |
0fd73091 | 4362 | char *uname, *gname; |
97e9cfa0 SH |
4363 | FILE *f; |
4364 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; | |
97e9cfa0 | 4365 | size_t len = 0; |
0fd73091 | 4366 | char *line = NULL; |
97e9cfa0 | 4367 | |
0fd73091 CB |
4368 | uname = getuname(); |
4369 | if (!uname) | |
97e9cfa0 SH |
4370 | return; |
4371 | ||
0fd73091 CB |
4372 | gname = getgname(); |
4373 | if (!gname) { | |
97e9cfa0 SH |
4374 | free(uname); |
4375 | return; | |
4376 | } | |
4377 | ||
4378 | f = fopen(subuidfile, "r"); | |
4379 | if (!f) { | |
4380 | ERROR("Your system is not configured with subuids"); | |
4381 | free(gname); | |
4382 | free(uname); | |
4383 | return; | |
4384 | } | |
0fd73091 | 4385 | |
97e9cfa0 | 4386 | while (getline(&line, &len, f) != -1) { |
0fd73091 | 4387 | char *p, *p2; |
b7930180 | 4388 | size_t no_newline = 0; |
0fd73091 CB |
4389 | |
4390 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4391 | if (*line == '#') |
4392 | continue; | |
4393 | if (!p) | |
4394 | continue; | |
4395 | *p = '\0'; | |
4396 | p++; | |
0fd73091 | 4397 | |
97e9cfa0 SH |
4398 | if (strcmp(line, uname)) |
4399 | continue; | |
0fd73091 | 4400 | |
97e9cfa0 SH |
4401 | p2 = strchr(p, ':'); |
4402 | if (!p2) | |
4403 | continue; | |
4404 | *p2 = '\0'; | |
4405 | p2++; | |
4406 | if (!*p2) | |
4407 | continue; | |
b7930180 CB |
4408 | no_newline = strcspn(p2, "\n"); |
4409 | p2[no_newline] = '\0'; | |
4410 | ||
b7b2fde4 | 4411 | if (lxc_safe_uint(p, &uid) < 0) |
0fd73091 | 4412 | WARN("Could not parse UID"); |
b7b2fde4 | 4413 | if (lxc_safe_uint(p2, &urange) < 0) |
0fd73091 | 4414 | WARN("Could not parse UID range"); |
97e9cfa0 SH |
4415 | } |
4416 | fclose(f); | |
4417 | ||
6be7389a | 4418 | f = fopen(subgidfile, "r"); |
97e9cfa0 SH |
4419 | if (!f) { |
4420 | ERROR("Your system is not configured with subgids"); | |
4421 | free(gname); | |
4422 | free(uname); | |
4423 | return; | |
4424 | } | |
0fd73091 | 4425 | |
97e9cfa0 | 4426 | while (getline(&line, &len, f) != -1) { |
0fd73091 | 4427 | char *p, *p2; |
b7930180 | 4428 | size_t no_newline = 0; |
0fd73091 CB |
4429 | |
4430 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4431 | if (*line == '#') |
4432 | continue; | |
4433 | if (!p) | |
4434 | continue; | |
4435 | *p = '\0'; | |
4436 | p++; | |
0fd73091 | 4437 | |
97e9cfa0 SH |
4438 | if (strcmp(line, uname)) |
4439 | continue; | |
0fd73091 | 4440 | |
97e9cfa0 SH |
4441 | p2 = strchr(p, ':'); |
4442 | if (!p2) | |
4443 | continue; | |
4444 | *p2 = '\0'; | |
4445 | p2++; | |
4446 | if (!*p2) | |
4447 | continue; | |
b7930180 CB |
4448 | no_newline = strcspn(p2, "\n"); |
4449 | p2[no_newline] = '\0'; | |
4450 | ||
b7b2fde4 | 4451 | if (lxc_safe_uint(p, &gid) < 0) |
0fd73091 | 4452 | WARN("Could not parse GID"); |
b7b2fde4 | 4453 | if (lxc_safe_uint(p2, &grange) < 0) |
0fd73091 | 4454 | WARN("Could not parse GID range"); |
97e9cfa0 SH |
4455 | } |
4456 | fclose(f); | |
4457 | ||
f10fad2f | 4458 | free(line); |
97e9cfa0 SH |
4459 | |
4460 | if (!urange || !grange) { | |
4461 | ERROR("You do not have subuids or subgids allocated"); | |
4462 | ERROR("Unprivileged containers require subuids and subgids"); | |
4463 | return; | |
4464 | } | |
4465 | ||
4466 | ERROR("You must either run as root, or define uid mappings"); | |
4467 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4468 | ERROR("~/.config/lxc/default.conf:"); | |
4469 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
bdcbb6b3 CB |
4470 | ERROR("lxc.idmap = u 0 %u %u", uid, urange); |
4471 | ERROR("lxc.idmap = g 0 %u %u", gid, grange); | |
97e9cfa0 SH |
4472 | |
4473 | free(gname); | |
4474 | free(uname); | |
4475 | } | |
aaf26830 | 4476 | |
a7307747 SH |
4477 | static void free_cgroup_settings(struct lxc_list *result) |
4478 | { | |
4479 | struct lxc_list *iterator, *next; | |
4480 | ||
0fd73091 | 4481 | lxc_list_for_each_safe (iterator, result, next) { |
a7307747 SH |
4482 | lxc_list_del(iterator); |
4483 | free(iterator); | |
4484 | } | |
4485 | free(result); | |
4486 | } | |
4487 | ||
0fd73091 | 4488 | /* Return the list of cgroup_settings sorted according to the following rules |
aaf26830 KT |
4489 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes |
4490 | */ | |
0fd73091 | 4491 | struct lxc_list *sort_cgroup_settings(struct lxc_list *cgroup_settings) |
aaf26830 KT |
4492 | { |
4493 | struct lxc_list *result; | |
aaf26830 | 4494 | struct lxc_cgroup *cg = NULL; |
0fd73091 | 4495 | struct lxc_list *it = NULL, *item = NULL, *memsw_limit = NULL; |
aaf26830 KT |
4496 | |
4497 | result = malloc(sizeof(*result)); | |
0fd73091 | 4498 | if (!result) |
fac7c663 | 4499 | return NULL; |
aaf26830 KT |
4500 | lxc_list_init(result); |
4501 | ||
0fd73091 CB |
4502 | /* Iterate over the cgroup settings and copy them to the output list. */ |
4503 | lxc_list_for_each (it, cgroup_settings) { | |
aaf26830 | 4504 | item = malloc(sizeof(*item)); |
fac7c663 | 4505 | if (!item) { |
a7307747 | 4506 | free_cgroup_settings(result); |
fac7c663 KT |
4507 | return NULL; |
4508 | } | |
0fd73091 | 4509 | |
aaf26830 KT |
4510 | item->elem = it->elem; |
4511 | cg = it->elem; | |
4512 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
4513 | /* Store the memsw_limit location */ | |
4514 | memsw_limit = item; | |
0fd73091 CB |
4515 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && |
4516 | memsw_limit != NULL) { | |
4517 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found | |
4518 | * before lxc.cgroup.memory.limit_in_bytes, swap these | |
4519 | * two items */ | |
aaf26830 KT |
4520 | item->elem = memsw_limit->elem; |
4521 | memsw_limit->elem = it->elem; | |
4522 | } | |
4523 | lxc_list_add_tail(result, item); | |
4524 | } | |
4525 | ||
4526 | return result; | |
a7307747 | 4527 | } |