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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 |
63fc76c3 | 542 | * if rootfs is a directory, then open ${rootfs}/.lxc-keep for writing for |
b7ed4bf0 CS |
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 | |
63fc76c3 GJ |
545 | * no name pollution is happens. |
546 | * don't unlink on NFS to avoid random named stale handles. | |
0c547523 SH |
547 | * return -1 on error. |
548 | * return -2 if nothing needed to be pinned. | |
549 | * return an open fd (>=0) if we pinned it. | |
550 | */ | |
551 | int pin_rootfs(const char *rootfs) | |
552 | { | |
0fd73091 CB |
553 | int fd, ret; |
554 | char absrootfs[MAXPATHLEN], absrootfspin[MAXPATHLEN]; | |
0c547523 | 555 | struct stat s; |
63fc76c3 | 556 | struct statfs sfs; |
0c547523 | 557 | |
e99ee0de | 558 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 559 | return -2; |
e99ee0de | 560 | |
00ec333b | 561 | if (!realpath(rootfs, absrootfs)) |
9be53773 | 562 | return -2; |
0c547523 | 563 | |
0fd73091 CB |
564 | ret = access(absrootfs, F_OK); |
565 | if (ret != 0) | |
0c547523 | 566 | return -1; |
0c547523 | 567 | |
0fd73091 CB |
568 | ret = stat(absrootfs, &s); |
569 | if (ret < 0) | |
0c547523 | 570 | return -1; |
0c547523 | 571 | |
72f919c4 | 572 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
573 | return -2; |
574 | ||
63fc76c3 | 575 | ret = snprintf(absrootfspin, MAXPATHLEN, "%s/.lxc-keep", absrootfs); |
00ec333b | 576 | if (ret >= MAXPATHLEN) |
0c547523 | 577 | return -1; |
0c547523 | 578 | |
0fd73091 | 579 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR | S_IRUSR); |
b7ed4bf0 CS |
580 | if (fd < 0) |
581 | return fd; | |
0fd73091 | 582 | |
63fc76c3 GJ |
583 | if (fstatfs (fd, &sfs)) { |
584 | return -1; | |
585 | } | |
586 | ||
587 | if (sfs.f_type == NFS_SUPER_MAGIC) { | |
588 | DEBUG("rootfs on NFS, not unlinking pin file \"%s\".", absrootfspin); | |
589 | return fd; | |
590 | } | |
591 | ||
b7ed4bf0 | 592 | (void)unlink(absrootfspin); |
0fd73091 | 593 | |
0c547523 SH |
594 | return fd; |
595 | } | |
596 | ||
0fd73091 CB |
597 | /* If we are asking to remount something, make sure that any NOEXEC etc are |
598 | * honored. | |
e2a7e8dc | 599 | */ |
5ae72b98 | 600 | unsigned long add_required_remount_flags(const char *s, const char *d, |
5285689c | 601 | unsigned long flags) |
e2a7e8dc | 602 | { |
614305f3 | 603 | #ifdef HAVE_STATVFS |
0fd73091 | 604 | int ret; |
e2a7e8dc SH |
605 | struct statvfs sb; |
606 | unsigned long required_flags = 0; | |
607 | ||
608 | if (!(flags & MS_REMOUNT)) | |
609 | return flags; | |
610 | ||
611 | if (!s) | |
612 | s = d; | |
613 | ||
614 | if (!s) | |
615 | return flags; | |
0fd73091 CB |
616 | |
617 | ret = statvfs(s, &sb); | |
618 | if (ret < 0) | |
e2a7e8dc SH |
619 | return flags; |
620 | ||
621 | if (sb.f_flag & MS_NOSUID) | |
622 | required_flags |= MS_NOSUID; | |
623 | if (sb.f_flag & MS_NODEV) | |
624 | required_flags |= MS_NODEV; | |
625 | if (sb.f_flag & MS_RDONLY) | |
626 | required_flags |= MS_RDONLY; | |
627 | if (sb.f_flag & MS_NOEXEC) | |
628 | required_flags |= MS_NOEXEC; | |
629 | ||
630 | return flags | required_flags; | |
614305f3 SH |
631 | #else |
632 | return flags; | |
633 | #endif | |
e2a7e8dc SH |
634 | } |
635 | ||
4fb3cba5 | 636 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 637 | { |
0fd73091 | 638 | int i, r; |
b06b8511 CS |
639 | static struct { |
640 | int match_mask; | |
641 | int match_flag; | |
642 | const char *source; | |
643 | const char *destination; | |
644 | const char *fstype; | |
645 | unsigned long flags; | |
646 | const char *options; | |
647 | } default_mounts[] = { | |
0fd73091 CB |
648 | /* Read-only bind-mounting... In older kernels, doing that |
649 | * required to do one MS_BIND mount and then | |
650 | * MS_REMOUNT|MS_RDONLY the same one. According to mount(2) | |
651 | * manpage, MS_BIND honors MS_RDONLY from kernel 2.6.26 | |
652 | * onwards. However, this apparently does not work on kernel | |
653 | * 3.8. Unfortunately, on that very same kernel, doing the same | |
654 | * trick as above doesn't seem to work either, there one needs | |
655 | * to ALSO specify MS_BIND for the remount, otherwise the | |
656 | * entire fs is remounted read-only or the mount fails because | |
657 | * it's busy... MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for | |
658 | * kernels as low as 2.6.32... | |
368bbc02 | 659 | */ |
0fd73091 | 660 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
592fd47a | 661 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
0fd73091 CB |
662 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL }, |
663 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, | |
664 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
665 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL }, | |
666 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, | |
667 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
668 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
669 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
670 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
671 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
672 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys", "%r/sys", NULL, MS_BIND, NULL }, | |
673 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
674 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
675 | { 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 }, | |
676 | { 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 }, | |
677 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 678 | }; |
368bbc02 | 679 | |
b06b8511 | 680 | for (i = 0; default_mounts[i].match_mask; i++) { |
0fd73091 CB |
681 | int saved_errno; |
682 | unsigned long mflags; | |
683 | char *destination = NULL; | |
684 | char *source = NULL; | |
685 | if ((flags & default_mounts[i].match_mask) != default_mounts[i].match_flag) | |
686 | continue; | |
687 | ||
688 | if (default_mounts[i].source) { | |
cc4fd506 | 689 | /* will act like strdup if %r is not present */ |
0fd73091 CB |
690 | source = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].source); |
691 | if (!source) | |
cc4fd506 | 692 | return -1; |
0fd73091 | 693 | } |
f24a52d5 | 694 | |
0fd73091 CB |
695 | if (!default_mounts[i].destination) { |
696 | ERROR("BUG: auto mounts destination %d was NULL", i); | |
b06b8511 | 697 | free(source); |
0fd73091 CB |
698 | return -1; |
699 | } | |
700 | ||
701 | /* will act like strdup if %r is not present */ | |
702 | destination = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].destination); | |
703 | if (!destination) { | |
704 | saved_errno = errno; | |
705 | free(source); | |
706 | errno = saved_errno; | |
707 | return -1; | |
708 | } | |
709 | ||
710 | mflags = add_required_remount_flags(source, destination, | |
711 | default_mounts[i].flags); | |
712 | r = safe_mount(source, destination, default_mounts[i].fstype, | |
713 | mflags, default_mounts[i].options, | |
714 | conf->rootfs.path ? conf->rootfs.mount : NULL); | |
715 | saved_errno = errno; | |
716 | if (r < 0 && errno == ENOENT) { | |
717 | INFO("Mount source or target for \"%s\" on \"%s\" does " | |
718 | "not exist. Skipping", source, destination); | |
719 | r = 0; | |
720 | } else if (r < 0) { | |
721 | SYSERROR("Failed to mount \"%s\" on \"%s\" with flags %lu", source, destination, mflags); | |
722 | } | |
723 | ||
724 | free(source); | |
725 | free(destination); | |
726 | if (r < 0) { | |
727 | errno = saved_errno; | |
728 | return -1; | |
368bbc02 | 729 | } |
368bbc02 CS |
730 | } |
731 | ||
b06b8511 | 732 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
733 | int cg_flags; |
734 | ||
3f69fb12 | 735 | cg_flags = flags & (LXC_AUTO_CGROUP_MASK & ~LXC_AUTO_CGROUP_FORCE); |
0fd73091 CB |
736 | /* If the type of cgroup mount was not specified, it depends on |
737 | * the container's capabilities as to what makes sense: if we | |
738 | * have CAP_SYS_ADMIN, the read-only part can be remounted | |
739 | * read-write anyway, so we may as well default to read-write; | |
740 | * then the admin will not be given a false sense of security. | |
741 | * (And if they really want mixed r/o r/w, then they can | |
742 | * explicitly specify :mixed.) OTOH, if the container lacks | |
743 | * CAP_SYS_ADMIN, do only default to :mixed, because then the | |
744 | * container can't remount it read-write. | |
745 | */ | |
0769b82a CS |
746 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { |
747 | int has_sys_admin = 0; | |
b0ee5983 CB |
748 | |
749 | if (!lxc_list_empty(&conf->keepcaps)) | |
0769b82a | 750 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); |
b0ee5983 | 751 | else |
0769b82a | 752 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); |
b0ee5983 CB |
753 | |
754 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) | |
0769b82a | 755 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; |
b0ee5983 | 756 | else |
0769b82a | 757 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; |
0769b82a | 758 | } |
0fd73091 | 759 | |
3f69fb12 | 760 | if (flags & LXC_AUTO_CGROUP_FORCE) |
0fd73091 CB |
761 | cg_flags |= LXC_AUTO_CGROUP_FORCE; |
762 | ||
8ede5f4c | 763 | if (!cgroup_mount(conf->rootfs.path ? conf->rootfs.mount : "", handler, cg_flags)) { |
0fd73091 | 764 | SYSERROR("Failed to mount \"/sys/fs/cgroup\""); |
b06b8511 | 765 | return -1; |
368bbc02 CS |
766 | } |
767 | } | |
768 | ||
368bbc02 | 769 | return 0; |
368bbc02 CS |
770 | } |
771 | ||
4e5440c6 | 772 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 773 | { |
0fd73091 CB |
774 | int ret; |
775 | ||
4e5440c6 DL |
776 | if (!utsname) |
777 | return 0; | |
0ad19a3f | 778 | |
0fd73091 CB |
779 | ret = sethostname(utsname->nodename, strlen(utsname->nodename)); |
780 | if (ret < 0) { | |
781 | SYSERROR("Failed to set the hostname to \"%s\"", utsname->nodename); | |
0ad19a3f | 782 | return -1; |
783 | } | |
784 | ||
0fd73091 | 785 | INFO("Set hostname to \"%s\"", utsname->nodename); |
cd54d859 | 786 | |
0ad19a3f | 787 | return 0; |
788 | } | |
789 | ||
69aa6655 DE |
790 | struct dev_symlinks { |
791 | const char *oldpath; | |
792 | const char *name; | |
793 | }; | |
794 | ||
795 | static const struct dev_symlinks dev_symlinks[] = { | |
0fd73091 CB |
796 | { "/proc/self/fd", "fd" }, |
797 | { "/proc/self/fd/0", "stdin" }, | |
798 | { "/proc/self/fd/1", "stdout" }, | |
799 | { "/proc/self/fd/2", "stderr" }, | |
69aa6655 DE |
800 | }; |
801 | ||
ed8704d0 | 802 | static int lxc_setup_dev_symlinks(const struct lxc_rootfs *rootfs) |
69aa6655 | 803 | { |
0fd73091 | 804 | int i, ret; |
69aa6655 | 805 | char path[MAXPATHLEN]; |
09227be2 | 806 | struct stat s; |
69aa6655 | 807 | |
69aa6655 DE |
808 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { |
809 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
0fd73091 CB |
810 | |
811 | ret = snprintf(path, sizeof(path), "%s/dev/%s", | |
812 | rootfs->path ? rootfs->mount : "", d->name); | |
69aa6655 DE |
813 | if (ret < 0 || ret >= MAXPATHLEN) |
814 | return -1; | |
09227be2 | 815 | |
0fd73091 CB |
816 | /* Stat the path first. If we don't get an error accept it as |
817 | * is and don't try to create it | |
09227be2 | 818 | */ |
0fd73091 CB |
819 | ret = stat(path, &s); |
820 | if (ret == 0) | |
09227be2 | 821 | continue; |
09227be2 | 822 | |
69aa6655 DE |
823 | ret = symlink(d->oldpath, path); |
824 | if (ret && errno != EEXIST) { | |
0fd73091 CB |
825 | if (errno == EROFS) { |
826 | WARN("Failed to create \"%s\". Read-only filesystem", path); | |
09227be2 | 827 | } else { |
0fd73091 | 828 | SYSERROR("Failed to create \"%s\"", path); |
09227be2 MW |
829 | return -1; |
830 | } | |
69aa6655 DE |
831 | } |
832 | } | |
0fd73091 | 833 | |
69aa6655 DE |
834 | return 0; |
835 | } | |
836 | ||
2187efd3 | 837 | /* Build a space-separate list of ptys to pass to systemd. */ |
393903d1 | 838 | static bool append_ptyname(char **pp, char *name) |
b0a33c1e | 839 | { |
393903d1 SH |
840 | char *p; |
841 | ||
842 | if (!*pp) { | |
843 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
844 | if (!*pp) | |
845 | return false; | |
0fd73091 | 846 | |
393903d1 SH |
847 | sprintf(*pp, "container_ttys=%s", name); |
848 | return true; | |
849 | } | |
0fd73091 | 850 | |
393903d1 SH |
851 | p = realloc(*pp, strlen(*pp) + strlen(name) + 2); |
852 | if (!p) | |
853 | return false; | |
0fd73091 | 854 | |
393903d1 SH |
855 | *pp = p; |
856 | strcat(p, " "); | |
857 | strcat(p, name); | |
0fd73091 | 858 | |
393903d1 SH |
859 | return true; |
860 | } | |
861 | ||
2187efd3 | 862 | static int lxc_setup_ttys(struct lxc_conf *conf) |
393903d1 | 863 | { |
9e1045e3 | 864 | int i, ret; |
0e4be3cf | 865 | const struct lxc_tty_info *ttys = &conf->ttys; |
393903d1 | 866 | char *ttydir = conf->ttydir; |
7c6ef2a2 | 867 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
b0a33c1e | 868 | |
e8bd4e43 | 869 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
870 | return 0; |
871 | ||
0e4be3cf CB |
872 | for (i = 0; i < ttys->nbtty; i++) { |
873 | struct lxc_terminal_info *tty = &ttys->tty[i]; | |
b0a33c1e | 874 | |
e8bd4e43 | 875 | ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1); |
73363c61 | 876 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 877 | return -1; |
9e1045e3 | 878 | |
7c6ef2a2 SH |
879 | if (ttydir) { |
880 | /* create dev/lxc/tty%d" */ | |
9e1045e3 CB |
881 | ret = snprintf(lxcpath, sizeof(lxcpath), |
882 | "/dev/%s/tty%d", ttydir, i + 1); | |
73363c61 | 883 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
7c6ef2a2 | 884 | return -1; |
9e1045e3 | 885 | |
7c6ef2a2 | 886 | ret = creat(lxcpath, 0660); |
9e1045e3 | 887 | if (ret < 0 && errno != EEXIST) { |
73363c61 | 888 | SYSERROR("Failed to create \"%s\"", lxcpath); |
7c6ef2a2 SH |
889 | return -1; |
890 | } | |
4d44e274 SH |
891 | if (ret >= 0) |
892 | close(ret); | |
9e1045e3 | 893 | |
7c6ef2a2 | 894 | ret = unlink(path); |
9e1045e3 | 895 | if (ret < 0 && errno != ENOENT) { |
73363c61 | 896 | SYSERROR("Failed to unlink \"%s\"", path); |
7c6ef2a2 SH |
897 | return -1; |
898 | } | |
b0a33c1e | 899 | |
2520facd | 900 | ret = mount(tty->name, lxcpath, "none", MS_BIND, 0); |
9e1045e3 | 901 | if (ret < 0) { |
73363c61 | 902 | WARN("Failed to bind mount \"%s\" onto \"%s\"", |
2520facd | 903 | tty->name, path); |
7c6ef2a2 SH |
904 | continue; |
905 | } | |
0fd73091 | 906 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, |
9e1045e3 | 907 | path); |
13954cce | 908 | |
9e1045e3 CB |
909 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", |
910 | ttydir, i + 1); | |
73363c61 | 911 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
9ba8130c | 912 | return -1; |
9e1045e3 | 913 | |
7c6ef2a2 | 914 | ret = symlink(lxcpath, path); |
9e1045e3 | 915 | if (ret < 0) { |
73363c61 | 916 | SYSERROR("Failed to create symlink \"%s\" -> \"%s\"", |
9e1045e3 | 917 | path, lxcpath); |
7c6ef2a2 SH |
918 | return -1; |
919 | } | |
920 | } else { | |
9e1045e3 CB |
921 | /* If we populated /dev, then we need to create |
922 | * /dev/ttyN | |
923 | */ | |
924 | ret = access(path, F_OK); | |
925 | if (ret < 0) { | |
c6883f38 | 926 | ret = creat(path, 0660); |
9e1045e3 | 927 | if (ret < 0) { |
73363c61 | 928 | SYSERROR("Failed to create \"%s\"", path); |
c6883f38 | 929 | /* this isn't fatal, continue */ |
025ed0f3 | 930 | } else { |
c6883f38 | 931 | close(ret); |
025ed0f3 | 932 | } |
c6883f38 | 933 | } |
9e1045e3 | 934 | |
2520facd | 935 | ret = mount(tty->name, path, "none", MS_BIND, 0); |
9e1045e3 | 936 | if (ret < 0) { |
2520facd | 937 | SYSERROR("Failed to mount '%s'->'%s'", tty->name, path); |
7c6ef2a2 SH |
938 | continue; |
939 | } | |
9e1045e3 | 940 | |
2520facd | 941 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, |
9e1045e3 | 942 | path); |
393903d1 | 943 | } |
9e1045e3 | 944 | |
2520facd | 945 | if (!append_ptyname(&conf->pty_names, tty->name)) { |
393903d1 SH |
946 | ERROR("Error setting up container_ttys string"); |
947 | return -1; | |
b0a33c1e | 948 | } |
949 | } | |
950 | ||
0e4be3cf | 951 | INFO("Finished setting up %d /dev/tty<N> device(s)", ttys->nbtty); |
b0a33c1e | 952 | return 0; |
953 | } | |
954 | ||
2187efd3 CB |
955 | int lxc_allocate_ttys(const char *name, struct lxc_conf *conf) |
956 | { | |
2187efd3 | 957 | int i, ret; |
0fd73091 | 958 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 CB |
959 | |
960 | /* no tty in the configuration */ | |
961 | if (!conf->tty) | |
962 | return 0; | |
963 | ||
0e4be3cf CB |
964 | ttys->tty = malloc(sizeof(*ttys->tty) * conf->tty); |
965 | if (!ttys->tty) | |
2187efd3 | 966 | return -ENOMEM; |
2187efd3 CB |
967 | |
968 | for (i = 0; i < conf->tty; i++) { | |
0e4be3cf | 969 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 970 | |
2520facd CB |
971 | ret = openpty(&tty->master, &tty->slave, |
972 | tty->name, NULL, NULL); | |
2187efd3 | 973 | if (ret) { |
0fd73091 | 974 | SYSERROR("Failed to create tty %d", i); |
0e4be3cf CB |
975 | ttys->nbtty = i; |
976 | lxc_delete_tty(ttys); | |
2187efd3 CB |
977 | return -ENOTTY; |
978 | } | |
979 | ||
0fd73091 | 980 | DEBUG("Created tty \"%s\" with master fd %d and slave fd %d", |
2520facd | 981 | tty->name, tty->master, tty->slave); |
2187efd3 CB |
982 | |
983 | /* Prevent leaking the file descriptors to the container */ | |
2520facd | 984 | ret = fcntl(tty->master, F_SETFD, FD_CLOEXEC); |
2187efd3 | 985 | if (ret < 0) |
0fd73091 CB |
986 | WARN("Failed to set FD_CLOEXEC flag on master fd %d of " |
987 | "tty device \"%s\": %s", | |
2520facd | 988 | tty->master, tty->name, strerror(errno)); |
2187efd3 | 989 | |
2520facd | 990 | ret = fcntl(tty->slave, F_SETFD, FD_CLOEXEC); |
2187efd3 | 991 | if (ret < 0) |
0fd73091 CB |
992 | WARN("Failed to set FD_CLOEXEC flag on slave fd %d of " |
993 | "tty device \"%s\": %s", | |
2520facd | 994 | tty->slave, tty->name, strerror(errno)); |
2187efd3 | 995 | |
2520facd | 996 | tty->busy = 0; |
2187efd3 CB |
997 | } |
998 | ||
0e4be3cf | 999 | ttys->nbtty = conf->tty; |
2187efd3 | 1000 | |
0fd73091 | 1001 | INFO("Finished creating %d tty devices", conf->tty); |
2187efd3 CB |
1002 | return 0; |
1003 | } | |
1004 | ||
0e4be3cf | 1005 | void lxc_delete_tty(struct lxc_tty_info *ttys) |
2187efd3 CB |
1006 | { |
1007 | int i; | |
1008 | ||
0e4be3cf CB |
1009 | for (i = 0; i < ttys->nbtty; i++) { |
1010 | struct lxc_terminal_info *tty = &ttys->tty[i]; | |
2187efd3 | 1011 | |
2520facd CB |
1012 | close(tty->master); |
1013 | close(tty->slave); | |
2187efd3 CB |
1014 | } |
1015 | ||
0e4be3cf CB |
1016 | free(ttys->tty); |
1017 | ttys->tty = NULL; | |
1018 | ttys->nbtty = 0; | |
2187efd3 CB |
1019 | } |
1020 | ||
1021 | static int lxc_send_ttys_to_parent(struct lxc_handler *handler) | |
1022 | { | |
1023 | int i; | |
0fd73091 | 1024 | int ret = -1; |
2187efd3 | 1025 | struct lxc_conf *conf = handler->conf; |
0e4be3cf | 1026 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 | 1027 | int sock = handler->data_sock[0]; |
2187efd3 | 1028 | |
0fd73091 | 1029 | if (conf->tty == 0) |
2187efd3 CB |
1030 | return 0; |
1031 | ||
1032 | for (i = 0; i < conf->tty; i++) { | |
1033 | int ttyfds[2]; | |
0e4be3cf | 1034 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1035 | |
2520facd CB |
1036 | ttyfds[0] = tty->master; |
1037 | ttyfds[1] = tty->slave; | |
2187efd3 CB |
1038 | |
1039 | ret = lxc_abstract_unix_send_fds(sock, ttyfds, 2, NULL, 0); | |
1040 | if (ret < 0) | |
1041 | break; | |
1042 | ||
0fd73091 | 1043 | TRACE("Sent ty \"%s\" with master fd %d and slave fd %d to " |
2520facd | 1044 | "parent", tty->name, tty->master, tty->slave); |
2187efd3 CB |
1045 | } |
1046 | ||
1047 | if (ret < 0) | |
1048 | ERROR("Failed to send %d ttys to parent: %s", conf->tty, | |
1049 | strerror(errno)); | |
1050 | else | |
1051 | TRACE("Sent %d ttys to parent", conf->tty); | |
1052 | ||
1053 | return ret; | |
1054 | } | |
1055 | ||
1056 | static int lxc_create_ttys(struct lxc_handler *handler) | |
1057 | { | |
1058 | int ret = -1; | |
1059 | struct lxc_conf *conf = handler->conf; | |
1060 | ||
1061 | ret = lxc_allocate_ttys(handler->name, conf); | |
1062 | if (ret < 0) { | |
1063 | ERROR("Failed to allocate ttys"); | |
1064 | goto on_error; | |
1065 | } | |
1066 | ||
1067 | ret = lxc_send_ttys_to_parent(handler); | |
1068 | if (ret < 0) { | |
1069 | ERROR("Failed to send ttys to parent"); | |
1070 | goto on_error; | |
1071 | } | |
1072 | ||
1073 | if (!conf->is_execute) { | |
1074 | ret = lxc_setup_ttys(conf); | |
1075 | if (ret < 0) { | |
1076 | ERROR("Failed to setup ttys"); | |
1077 | goto on_error; | |
1078 | } | |
1079 | } | |
1080 | ||
1081 | if (conf->pty_names) { | |
1082 | ret = setenv("container_ttys", conf->pty_names, 1); | |
1083 | if (ret < 0) | |
1084 | SYSERROR("Failed to set \"container_ttys=%s\"", conf->pty_names); | |
1085 | } | |
1086 | ||
1087 | ret = 0; | |
1088 | ||
1089 | on_error: | |
0e4be3cf | 1090 | lxc_delete_tty(&conf->ttys); |
2187efd3 CB |
1091 | |
1092 | return ret; | |
1093 | } | |
1094 | ||
59bb8698 | 1095 | static int setup_rootfs_pivot_root(const char *rootfs) |
bf601689 | 1096 | { |
0fd73091 CB |
1097 | int ret; |
1098 | int newroot = -1, oldroot = -1; | |
bf601689 | 1099 | |
2d489f9e SH |
1100 | oldroot = open("/", O_DIRECTORY | O_RDONLY); |
1101 | if (oldroot < 0) { | |
0fd73091 | 1102 | SYSERROR("Failed to open old root directory"); |
9ba8130c SH |
1103 | return -1; |
1104 | } | |
0fd73091 | 1105 | |
2d489f9e SH |
1106 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY); |
1107 | if (newroot < 0) { | |
0fd73091 CB |
1108 | SYSERROR("Failed to open new root directory"); |
1109 | goto on_error; | |
c08556c6 | 1110 | } |
bf601689 | 1111 | |
cc6f6dd7 | 1112 | /* change into new root fs */ |
0fd73091 CB |
1113 | ret = fchdir(newroot); |
1114 | if (ret < 0) { | |
1115 | SYSERROR("Failed to change to new rootfs \"%s\"", rootfs); | |
1116 | goto on_error; | |
cc6f6dd7 DL |
1117 | } |
1118 | ||
cc6f6dd7 | 1119 | /* pivot_root into our new root fs */ |
0fd73091 CB |
1120 | ret = pivot_root(".", "."); |
1121 | if (ret < 0) { | |
1122 | SYSERROR("Failed to pivot_root()"); | |
1123 | goto on_error; | |
bf601689 | 1124 | } |
cc6f6dd7 | 1125 | |
e599717b | 1126 | /* At this point the old-root is mounted on top of our new-root. To |
0fd73091 CB |
1127 | * unmounted it we must not be chdir'd into it, so escape back to |
1128 | * old-root. | |
2d489f9e | 1129 | */ |
0fd73091 CB |
1130 | ret = fchdir(oldroot); |
1131 | if (ret < 0) { | |
1132 | SYSERROR("Failed to enter old root directory"); | |
1133 | goto on_error; | |
2d489f9e | 1134 | } |
0fd73091 | 1135 | |
e599717b FW |
1136 | /* Make oldroot rslave to make sure our umounts don't propagate to the |
1137 | * host. | |
1138 | */ | |
1139 | ret = mount("", ".", "", MS_SLAVE | MS_REC, NULL); | |
1140 | if (ret < 0) { | |
1141 | SYSERROR("Failed to make oldroot rslave"); | |
1142 | goto on_error; | |
1143 | } | |
1144 | ||
0fd73091 CB |
1145 | ret = umount2(".", MNT_DETACH); |
1146 | if (ret < 0) { | |
1147 | SYSERROR("Failed to detach old root directory"); | |
1148 | goto on_error; | |
cc6f6dd7 DL |
1149 | } |
1150 | ||
0fd73091 CB |
1151 | ret = fchdir(newroot); |
1152 | if (ret < 0) { | |
1153 | SYSERROR("Failed to re-enter new root directory"); | |
1154 | goto on_error; | |
2d489f9e | 1155 | } |
cc6f6dd7 | 1156 | |
2d489f9e SH |
1157 | close(oldroot); |
1158 | close(newroot); | |
bf601689 | 1159 | |
0fd73091 | 1160 | DEBUG("pivot_root(\"%s\") successful", rootfs); |
bf601689 | 1161 | |
bf601689 | 1162 | return 0; |
2d489f9e | 1163 | |
0fd73091 | 1164 | on_error: |
2d489f9e SH |
1165 | if (oldroot != -1) |
1166 | close(oldroot); | |
1167 | if (newroot != -1) | |
1168 | close(newroot); | |
0fd73091 | 1169 | |
2d489f9e | 1170 | return -1; |
bf601689 MH |
1171 | } |
1172 | ||
7133b912 CB |
1173 | /* Just create a path for /dev under $lxcpath/$name and in rootfs If we hit an |
1174 | * error, log it but don't fail yet. | |
91c3830e | 1175 | */ |
7133b912 CB |
1176 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, |
1177 | const char *lxcpath) | |
91c3830e SH |
1178 | { |
1179 | int ret; | |
87da4ec3 SH |
1180 | size_t clen; |
1181 | char *path; | |
91c3830e | 1182 | |
7133b912 | 1183 | INFO("Preparing \"/dev\""); |
bc6928ff | 1184 | |
14221cbb | 1185 | /* $(rootfs->mount) + "/dev/pts" + '\0' */ |
ec50007f | 1186 | clen = (rootfs->path ? strlen(rootfs->mount) : 0) + 9; |
87da4ec3 | 1187 | path = alloca(clen); |
bc6928ff | 1188 | |
ec50007f | 1189 | ret = snprintf(path, clen, "%s/dev", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1190 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1191 | return -1; |
bc6928ff | 1192 | |
87da4ec3 | 1193 | if (!dir_exists(path)) { |
7133b912 CB |
1194 | WARN("\"/dev\" directory does not exist. Proceeding without " |
1195 | "autodev being set up"); | |
87da4ec3 | 1196 | return 0; |
bc6928ff | 1197 | } |
87da4ec3 | 1198 | |
1ec0e8e3 | 1199 | ret = safe_mount("none", path, "tmpfs", 0, "size=500000,mode=755", |
7133b912 CB |
1200 | rootfs->path ? rootfs->mount : NULL); |
1201 | if (ret < 0) { | |
1202 | SYSERROR("Failed to mount tmpfs on \"%s\"", path); | |
1ec0e8e3 | 1203 | return -1; |
91c3830e | 1204 | } |
7133b912 | 1205 | INFO("Mounted tmpfs on \"%s\"", path); |
87da4ec3 | 1206 | |
ec50007f | 1207 | ret = snprintf(path, clen, "%s/dev/pts", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1208 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1209 | return -1; |
87da4ec3 | 1210 | |
7133b912 | 1211 | /* If we are running on a devtmpfs mapping, dev/pts may already exist. |
bc6928ff MW |
1212 | * If not, then create it and exit if that fails... |
1213 | */ | |
87da4ec3 | 1214 | if (!dir_exists(path)) { |
bc6928ff | 1215 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
7133b912 CB |
1216 | if (ret < 0) { |
1217 | SYSERROR("Failed to create directory \"%s\"", path); | |
bc6928ff MW |
1218 | return -1; |
1219 | } | |
91c3830e SH |
1220 | } |
1221 | ||
7133b912 | 1222 | INFO("Prepared \"/dev\""); |
91c3830e SH |
1223 | return 0; |
1224 | } | |
1225 | ||
5e73416f | 1226 | struct lxc_device_node { |
74a3920a | 1227 | const char *name; |
5e73416f CB |
1228 | const mode_t mode; |
1229 | const int maj; | |
1230 | const int min; | |
c6883f38 SH |
1231 | }; |
1232 | ||
5e73416f | 1233 | static const struct lxc_device_node lxc_devices[] = { |
06749971 | 1234 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, |
5e73416f | 1235 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
06749971 CB |
1236 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, |
1237 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
5e73416f CB |
1238 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, |
1239 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
c6883f38 SH |
1240 | }; |
1241 | ||
27245ff7 | 1242 | static int lxc_fill_autodev(const struct lxc_rootfs *rootfs) |
c6883f38 | 1243 | { |
5e73416f | 1244 | int i, ret; |
c6883f38 | 1245 | char path[MAXPATHLEN]; |
3a32201c | 1246 | mode_t cmask; |
5e73416f | 1247 | bool can_mknod = true; |
c6883f38 | 1248 | |
3999be0a CB |
1249 | ret = snprintf(path, MAXPATHLEN, "%s/dev", |
1250 | rootfs->path ? rootfs->mount : ""); | |
1251 | if (ret < 0 || ret >= MAXPATHLEN) | |
c6883f38 | 1252 | return -1; |
91c3830e | 1253 | |
0bbf8572 CB |
1254 | /* ignore, just don't try to fill in */ |
1255 | if (!dir_exists(path)) | |
9cb4d183 SH |
1256 | return 0; |
1257 | ||
3999be0a CB |
1258 | INFO("Populating \"/dev\""); |
1259 | ||
3a32201c | 1260 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
5e73416f CB |
1261 | for (i = 0; i < sizeof(lxc_devices) / sizeof(lxc_devices[0]); i++) { |
1262 | char hostpath[MAXPATHLEN]; | |
1263 | const struct lxc_device_node *device = &lxc_devices[i]; | |
0728ebf4 | 1264 | |
3999be0a | 1265 | ret = snprintf(path, MAXPATHLEN, "%s/dev/%s", |
5e73416f | 1266 | rootfs->path ? rootfs->mount : "", device->name); |
c6883f38 SH |
1267 | if (ret < 0 || ret >= MAXPATHLEN) |
1268 | return -1; | |
0bbf8572 | 1269 | |
5e73416f CB |
1270 | if (can_mknod) { |
1271 | ret = mknod(path, device->mode, makedev(device->maj, device->min)); | |
1272 | if (ret == 0 || (ret < 0 && errno == EEXIST)) { | |
1273 | DEBUG("Created device node \"%s\"", path); | |
0bbf8572 CB |
1274 | continue; |
1275 | } | |
1276 | ||
5e73416f CB |
1277 | if (errno != EPERM) { |
1278 | SYSERROR("Failed to create device node \"%s\"", path); | |
9cb4d183 SH |
1279 | return -1; |
1280 | } | |
3999be0a | 1281 | |
5e73416f CB |
1282 | /* This can e.g. happen when the container is |
1283 | * unprivileged or CAP_MKNOD has been dropped. | |
1284 | */ | |
1285 | can_mknod = false; | |
1286 | } | |
1287 | ||
1288 | ret = mknod(path, S_IFREG, 0); | |
1289 | if (ret < 0 && errno != EEXIST) { | |
1290 | SYSERROR("Failed to create file \"%s\"", path); | |
1291 | return -1; | |
1292 | } | |
1293 | ||
1294 | /* Fallback to bind-mounting the device from the host. */ | |
1295 | ret = snprintf(hostpath, MAXPATHLEN, "/dev/%s", device->name); | |
1296 | if (ret < 0 || ret >= MAXPATHLEN) | |
1297 | return -1; | |
1298 | ||
1299 | ret = safe_mount(hostpath, path, 0, MS_BIND, NULL, | |
1300 | rootfs->path ? rootfs->mount : NULL); | |
1301 | if (ret < 0) { | |
1302 | SYSERROR("Failed to bind mount host device node \"%s\" " | |
1303 | "onto \"%s\"", hostpath, path); | |
1304 | return -1; | |
c6883f38 | 1305 | } |
5e73416f CB |
1306 | DEBUG("Bind mounted host device node \"%s\" onto \"%s\"", |
1307 | hostpath, path); | |
c6883f38 | 1308 | } |
5e73416f | 1309 | (void)umask(cmask); |
c6883f38 | 1310 | |
3999be0a | 1311 | INFO("Populated \"/dev\""); |
c6883f38 SH |
1312 | return 0; |
1313 | } | |
1314 | ||
9aa76a17 | 1315 | static int lxc_setup_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1316 | { |
9aa76a17 | 1317 | int ret; |
10bc1861 | 1318 | struct lxc_storage *bdev; |
91c3e281 | 1319 | const struct lxc_rootfs *rootfs; |
cc28d0b0 | 1320 | |
91c3e281 | 1321 | rootfs = &conf->rootfs; |
a0f379bf | 1322 | if (!rootfs->path) { |
0fd73091 CB |
1323 | ret = mount("", "/", NULL, MS_SLAVE | MS_REC, 0); |
1324 | if (ret < 0) { | |
1325 | SYSERROR("Failed to make / rslave"); | |
a0f379bf DW |
1326 | return -1; |
1327 | } | |
0fd73091 | 1328 | |
c69bd12f | 1329 | return 0; |
a0f379bf | 1330 | } |
0ad19a3f | 1331 | |
0fd73091 CB |
1332 | ret = access(rootfs->mount, F_OK); |
1333 | if (ret != 0) { | |
1334 | SYSERROR("Failed to access to \"%s\". Check it is present", | |
12297168 | 1335 | rootfs->mount); |
b1789442 DL |
1336 | return -1; |
1337 | } | |
1338 | ||
8a388ed4 | 1339 | bdev = storage_init(conf); |
9aa76a17 | 1340 | if (!bdev) { |
0fd73091 | 1341 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1342 | rootfs->path, rootfs->mount, |
1343 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1344 | return -1; |
9be53773 | 1345 | } |
9aa76a17 CB |
1346 | |
1347 | ret = bdev->ops->mount(bdev); | |
10bc1861 | 1348 | storage_put(bdev); |
9aa76a17 | 1349 | if (ret < 0) { |
0fd73091 | 1350 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1351 | rootfs->path, rootfs->mount, |
1352 | rootfs->options ? rootfs->options : "(null)"); | |
c3f0a28c | 1353 | return -1; |
1354 | } | |
0ad19a3f | 1355 | |
0fd73091 | 1356 | DEBUG("Mounted rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1357 | rootfs->path, rootfs->mount, |
1358 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1359 | |
ac778708 DL |
1360 | return 0; |
1361 | } | |
1362 | ||
91e93c71 AV |
1363 | int prepare_ramfs_root(char *root) |
1364 | { | |
0fd73091 CB |
1365 | int i, ret; |
1366 | char *p, *p2; | |
1367 | char buf[LXC_LINELEN], nroot[PATH_MAX]; | |
91e93c71 | 1368 | FILE *f; |
91e93c71 | 1369 | |
0fd73091 CB |
1370 | if (!realpath(root, nroot)) |
1371 | return -1; | |
91e93c71 | 1372 | |
0fd73091 CB |
1373 | ret = chdir("/"); |
1374 | if (ret < 0) | |
1375 | return -1; | |
91e93c71 | 1376 | |
0fd73091 CB |
1377 | /* We could use here MS_MOVE, but in userns this mount is locked and |
1378 | * can't be moved. | |
91e93c71 | 1379 | */ |
0fd73091 CB |
1380 | ret = mount(root, "/", NULL, MS_REC | MS_BIND, NULL); |
1381 | if (ret < 0) { | |
1382 | SYSERROR("Failed to move \"%s\" into \"/\"", root); | |
1383 | return -1; | |
91e93c71 AV |
1384 | } |
1385 | ||
0fd73091 CB |
1386 | ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL); |
1387 | if (ret < 0) { | |
1388 | SYSERROR("Failed to make \"/\" rprivate"); | |
1389 | return -1; | |
91e93c71 AV |
1390 | } |
1391 | ||
0fd73091 CB |
1392 | /* The following code cleans up inhereted mounts which are not required |
1393 | * for CT. | |
91e93c71 AV |
1394 | * |
1395 | * The mountinfo file shows not all mounts, if a few points have been | |
1396 | * unmounted between read operations from the mountinfo. So we need to | |
1397 | * read mountinfo a few times. | |
1398 | * | |
1399 | * This loop can be skipped if a container uses unserns, because all | |
1400 | * inherited mounts are locked and we should live with all this trash. | |
1401 | */ | |
0fd73091 | 1402 | for (;;) { |
91e93c71 AV |
1403 | int progress = 0; |
1404 | ||
1405 | f = fopen("./proc/self/mountinfo", "r"); | |
1406 | if (!f) { | |
1407 | SYSERROR("Unable to open /proc/self/mountinfo"); | |
1408 | return -1; | |
1409 | } | |
0fd73091 | 1410 | |
eab15c1e | 1411 | while (fgets(buf, LXC_LINELEN, f)) { |
91e93c71 AV |
1412 | for (p = buf, i=0; p && i < 4; i++) |
1413 | p = strchr(p+1, ' '); | |
0fd73091 | 1414 | |
91e93c71 AV |
1415 | if (!p) |
1416 | continue; | |
0fd73091 | 1417 | |
91e93c71 AV |
1418 | p2 = strchr(p+1, ' '); |
1419 | if (!p2) | |
1420 | continue; | |
1421 | ||
1422 | *p2 = '\0'; | |
1423 | *p = '.'; | |
1424 | ||
1425 | if (strcmp(p + 1, "/") == 0) | |
1426 | continue; | |
0fd73091 | 1427 | |
91e93c71 AV |
1428 | if (strcmp(p + 1, "/proc") == 0) |
1429 | continue; | |
1430 | ||
0fd73091 CB |
1431 | ret = umount2(p, MNT_DETACH); |
1432 | if (ret == 0) | |
91e93c71 AV |
1433 | progress++; |
1434 | } | |
0fd73091 | 1435 | |
91e93c71 | 1436 | fclose(f); |
0fd73091 | 1437 | |
91e93c71 AV |
1438 | if (!progress) |
1439 | break; | |
1440 | } | |
1441 | ||
0fd73091 CB |
1442 | /* This also can be skipped if a container uses unserns. */ |
1443 | (void)umount2("./proc", MNT_DETACH); | |
91e93c71 AV |
1444 | |
1445 | /* It is weird, but chdir("..") moves us in a new root */ | |
0fd73091 CB |
1446 | ret = chdir(".."); |
1447 | if (ret < 0) { | |
91e93c71 AV |
1448 | SYSERROR("Unable to change working directory"); |
1449 | return -1; | |
1450 | } | |
1451 | ||
0fd73091 CB |
1452 | ret = chroot("."); |
1453 | if (ret < 0) { | |
91e93c71 AV |
1454 | SYSERROR("Unable to chroot"); |
1455 | return -1; | |
1456 | } | |
1457 | ||
1458 | return 0; | |
1459 | } | |
1460 | ||
74a3920a | 1461 | static int setup_pivot_root(const struct lxc_rootfs *rootfs) |
ac778708 | 1462 | { |
0fd73091 CB |
1463 | int ret; |
1464 | ||
39c7b795 | 1465 | if (!rootfs->path) { |
0fd73091 | 1466 | DEBUG("Container does not have a rootfs"); |
ac778708 | 1467 | return 0; |
39c7b795 | 1468 | } |
ac778708 | 1469 | |
91e93c71 | 1470 | if (detect_ramfs_rootfs()) { |
0fd73091 CB |
1471 | DEBUG("Detected that container is on ramfs"); |
1472 | ||
1473 | ret = prepare_ramfs_root(rootfs->mount); | |
1474 | if (ret < 0) { | |
1475 | ERROR("Failed to prepare minimal ramfs root"); | |
91e93c71 | 1476 | return -1; |
39c7b795 CB |
1477 | } |
1478 | ||
0fd73091 | 1479 | DEBUG("Prepared ramfs root for container"); |
39c7b795 CB |
1480 | return 0; |
1481 | } | |
1482 | ||
0fd73091 CB |
1483 | ret = setup_rootfs_pivot_root(rootfs->mount); |
1484 | if (ret < 0) { | |
1485 | ERROR("Failed to pivot_root()"); | |
25368b52 | 1486 | return -1; |
c69bd12f DL |
1487 | } |
1488 | ||
0fd73091 | 1489 | DEBUG("Finished pivot_root()"); |
25368b52 | 1490 | return 0; |
0ad19a3f | 1491 | } |
1492 | ||
f4900711 CB |
1493 | static struct id_map *find_mapped_nsid_entry(struct lxc_conf *conf, unsigned id, |
1494 | enum idtype idtype) | |
1495 | { | |
1496 | struct lxc_list *it; | |
1497 | struct id_map *map; | |
1498 | struct id_map *retmap = NULL; | |
1499 | ||
dcf0ffdf CB |
1500 | /* Shortcut for container's root mappings. */ |
1501 | if (id == 0) { | |
1502 | if (idtype == ID_TYPE_UID) | |
1503 | return conf->root_nsuid_map; | |
1504 | ||
1505 | if (idtype == ID_TYPE_GID) | |
1506 | return conf->root_nsgid_map; | |
1507 | } | |
1508 | ||
f4900711 CB |
1509 | lxc_list_for_each(it, &conf->id_map) { |
1510 | map = it->elem; | |
1511 | if (map->idtype != idtype) | |
1512 | continue; | |
1513 | ||
1514 | if (id >= map->nsid && id < map->nsid + map->range) { | |
1515 | retmap = map; | |
1516 | break; | |
1517 | } | |
1518 | } | |
1519 | ||
1520 | return retmap; | |
1521 | } | |
1522 | ||
1523 | static int lxc_setup_devpts(struct lxc_conf *conf) | |
3c26f34e | 1524 | { |
70761e5e | 1525 | int ret; |
f4900711 | 1526 | const char *default_devpts_mntopts; |
9d28c4f9 | 1527 | char devpts_mntopts[256]; |
77890c6d | 1528 | |
f4900711 | 1529 | if (conf->pts <= 0) { |
0fd73091 | 1530 | DEBUG("No new devpts instance will be mounted since no pts " |
70761e5e | 1531 | "devices are requested"); |
d852c78c | 1532 | return 0; |
3c26f34e | 1533 | } |
1534 | ||
f4900711 CB |
1535 | if (!find_mapped_nsid_entry(conf, 5, ID_TYPE_GID)) |
1536 | default_devpts_mntopts = "newinstance,ptmxmode=0666,mode=0620"; | |
1537 | else | |
1538 | default_devpts_mntopts = "newinstance,ptmxmode=0666,mode=0620,gid=5"; | |
1539 | ||
9d28c4f9 | 1540 | ret = snprintf(devpts_mntopts, sizeof(devpts_mntopts), "%s,max=%d", |
f4900711 | 1541 | default_devpts_mntopts, conf->pts); |
9d28c4f9 CB |
1542 | if (ret < 0 || (size_t)ret >= sizeof(devpts_mntopts)) |
1543 | return -1; | |
1544 | ||
d5cb35d6 | 1545 | /* Unmount old devpts instance. */ |
70761e5e CB |
1546 | ret = access("/dev/pts/ptmx", F_OK); |
1547 | if (!ret) { | |
70761e5e CB |
1548 | ret = umount("/dev/pts"); |
1549 | if (ret < 0) { | |
0fd73091 | 1550 | SYSERROR("Failed to unmount old devpts instance"); |
70761e5e | 1551 | return -1; |
7e40254a | 1552 | } |
0fd73091 | 1553 | DEBUG("Unmounted old devpts instance"); |
7e40254a JTLB |
1554 | } |
1555 | ||
70761e5e CB |
1556 | /* Create mountpoint for devpts instance. */ |
1557 | ret = mkdir("/dev/pts", 0755); | |
1558 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1559 | SYSERROR("Failed to create \"/dev/pts\" directory"); |
3c26f34e | 1560 | return -1; |
1561 | } | |
1562 | ||
70761e5e | 1563 | /* Mount new devpts instance. */ |
f4900711 | 1564 | ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, devpts_mntopts); |
70761e5e | 1565 | if (ret < 0) { |
0fd73091 | 1566 | SYSERROR("Failed to mount new devpts instance"); |
70761e5e CB |
1567 | return -1; |
1568 | } | |
0fd73091 | 1569 | DEBUG("Mount new devpts instance with options \"%s\"", devpts_mntopts); |
70761e5e | 1570 | |
d5cb35d6 | 1571 | /* Remove any pre-existing /dev/ptmx file. */ |
70761e5e | 1572 | ret = access("/dev/ptmx", F_OK); |
d5cb35d6 CB |
1573 | if (!ret) { |
1574 | ret = remove("/dev/ptmx"); | |
1575 | if (ret < 0) { | |
0fd73091 | 1576 | SYSERROR("Failed to remove existing \"/dev/ptmx\" file"); |
d5cb35d6 | 1577 | return -1; |
70761e5e | 1578 | } |
0fd73091 | 1579 | DEBUG("Removed existing \"/dev/ptmx\" file"); |
3c26f34e | 1580 | } |
1581 | ||
d5cb35d6 CB |
1582 | /* Create dummy /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
1583 | ret = open("/dev/ptmx", O_CREAT, 0666); | |
1584 | if (ret < 0) { | |
0fd73091 | 1585 | SYSERROR("Failed to create dummy \"/dev/ptmx\" file as bind mount target"); |
d5cb35d6 CB |
1586 | return -1; |
1587 | } | |
e87bd19c | 1588 | close(ret); |
0fd73091 | 1589 | DEBUG("Created dummy \"/dev/ptmx\" file as bind mount target"); |
77890c6d | 1590 | |
d5cb35d6 | 1591 | /* Fallback option: create symlink /dev/ptmx -> /dev/pts/ptmx */ |
e87bd19c | 1592 | ret = mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL); |
d5cb35d6 | 1593 | if (!ret) { |
0fd73091 | 1594 | DEBUG("Bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1595 | return 0; |
1596 | } else { | |
1597 | /* Fallthrough and try to create a symlink. */ | |
0fd73091 | 1598 | ERROR("Failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1599 | } |
1600 | ||
1601 | /* Remove the dummy /dev/ptmx file we created above. */ | |
1602 | ret = remove("/dev/ptmx"); | |
70761e5e | 1603 | if (ret < 0) { |
0fd73091 | 1604 | SYSERROR("Failed to remove existing \"/dev/ptmx\""); |
d5cb35d6 CB |
1605 | return -1; |
1606 | } | |
1607 | ||
1608 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
1609 | ret = symlink("/dev/pts/ptmx", "/dev/ptmx"); | |
1610 | if (ret < 0) { | |
0fd73091 | 1611 | SYSERROR("Failed to create symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
3c26f34e | 1612 | return -1; |
1613 | } | |
0fd73091 | 1614 | DEBUG("Created symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
cd54d859 | 1615 | |
3c26f34e | 1616 | return 0; |
1617 | } | |
1618 | ||
cccc74b5 DL |
1619 | static int setup_personality(int persona) |
1620 | { | |
0fd73091 CB |
1621 | int ret; |
1622 | ||
1623 | #if HAVE_SYS_PERSONALITY_H | |
cccc74b5 DL |
1624 | if (persona == -1) |
1625 | return 0; | |
1626 | ||
0fd73091 CB |
1627 | ret = personality(persona); |
1628 | if (ret < 0) { | |
1629 | SYSERROR("Failed to set personality to \"0x%x\"", persona); | |
cccc74b5 DL |
1630 | return -1; |
1631 | } | |
1632 | ||
0fd73091 CB |
1633 | INFO("Set personality to \"0x%x\"", persona); |
1634 | #endif | |
cccc74b5 DL |
1635 | |
1636 | return 0; | |
1637 | } | |
1638 | ||
3d7d929a | 1639 | static int lxc_setup_dev_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1640 | const struct lxc_terminal *console) |
6e590161 | 1641 | { |
0fd73091 | 1642 | int fd, ret; |
63376d7d | 1643 | char path[MAXPATHLEN]; |
86530b0a | 1644 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
52e35957 | 1645 | |
8b1b1210 CB |
1646 | if (console->path && !strcmp(console->path, "none")) |
1647 | return 0; | |
1648 | ||
86530b0a | 1649 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3d7d929a | 1650 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1651 | return -1; |
52e35957 | 1652 | |
8b1b1210 CB |
1653 | /* When we are asked to setup a console we remove any previous |
1654 | * /dev/console bind-mounts. | |
1655 | */ | |
a7ba3c7f CB |
1656 | if (file_exists(path)) { |
1657 | ret = lxc_unstack_mountpoint(path, false); | |
1658 | if (ret < 0) { | |
86530b0a | 1659 | ERROR("Failed to unmount \"%s\": %s", path, strerror(errno)); |
a7ba3c7f CB |
1660 | return -ret; |
1661 | } else { | |
86530b0a | 1662 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1663 | } |
8b1b1210 CB |
1664 | } |
1665 | ||
1666 | /* For unprivileged containers autodev or automounts will already have | |
1667 | * taken care of creating /dev/console. | |
1668 | */ | |
0728ebf4 TA |
1669 | fd = open(path, O_CREAT | O_EXCL, S_IXUSR | S_IXGRP | S_IXOTH); |
1670 | if (fd < 0) { | |
1671 | if (errno != EEXIST) { | |
86530b0a | 1672 | SYSERROR("Failed to create console"); |
3d7d929a | 1673 | return -errno; |
0728ebf4 TA |
1674 | } |
1675 | } else { | |
1676 | close(fd); | |
52e35957 DL |
1677 | } |
1678 | ||
86530b0a L |
1679 | ret = chmod(console->name, S_IXUSR | S_IXGRP | S_IXOTH); |
1680 | if (ret < 0) { | |
0fd73091 CB |
1681 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
1682 | S_IXUSR | S_IXGRP | S_IXOTH, console->name); | |
3d7d929a | 1683 | return -errno; |
63376d7d | 1684 | } |
13954cce | 1685 | |
86530b0a L |
1686 | ret = safe_mount(console->name, path, "none", MS_BIND, 0, rootfs_path); |
1687 | if (ret < 0) { | |
0fd73091 | 1688 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, path); |
6e590161 | 1689 | return -1; |
1690 | } | |
1691 | ||
86530b0a | 1692 | DEBUG("Mounted pts device \"%s\" onto \"%s\"", console->name, path); |
7c6ef2a2 SH |
1693 | return 0; |
1694 | } | |
1695 | ||
3d7d929a | 1696 | static int lxc_setup_ttydir_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1697 | const struct lxc_terminal *console, |
3d7d929a | 1698 | char *ttydir) |
7c6ef2a2 | 1699 | { |
3dc035f1 | 1700 | int ret, fd; |
3d7d929a | 1701 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
86530b0a | 1702 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
7c6ef2a2 | 1703 | |
3dc035f1 L |
1704 | if (console->path && !strcmp(console->path, "none")) |
1705 | return 0; | |
1706 | ||
7c6ef2a2 | 1707 | /* create rootfs/dev/<ttydir> directory */ |
86530b0a | 1708 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs_path, ttydir); |
3d7d929a | 1709 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1710 | return -1; |
3d7d929a | 1711 | |
7c6ef2a2 SH |
1712 | ret = mkdir(path, 0755); |
1713 | if (ret && errno != EEXIST) { | |
0fd73091 | 1714 | SYSERROR("Failed to create \"%s\"", path); |
3d7d929a | 1715 | return -errno; |
7c6ef2a2 | 1716 | } |
4742cd9a | 1717 | DEBUG("Created directory for console and tty devices at \"%s\"", path); |
7c6ef2a2 | 1718 | |
86530b0a | 1719 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", rootfs_path, ttydir); |
3d7d929a CB |
1720 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
1721 | return -1; | |
1722 | ||
7c6ef2a2 | 1723 | ret = creat(lxcpath, 0660); |
3d7d929a | 1724 | if (ret == -1 && errno != EEXIST) { |
0fd73091 | 1725 | SYSERROR("Failed to create \"%s\"", lxcpath); |
3d7d929a | 1726 | return -errno; |
7c6ef2a2 | 1727 | } |
4d44e274 SH |
1728 | if (ret >= 0) |
1729 | close(ret); | |
7c6ef2a2 | 1730 | |
86530b0a | 1731 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3dc035f1 | 1732 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1733 | return -1; |
2a12fefd | 1734 | |
3dc035f1 | 1735 | if (file_exists(path)) { |
a7ba3c7f | 1736 | ret = lxc_unstack_mountpoint(path, false); |
2a12fefd | 1737 | if (ret < 0) { |
0fd73091 | 1738 | ERROR("%s - Failed to unmount \"%s\"", strerror(errno), path); |
a7ba3c7f CB |
1739 | return -ret; |
1740 | } else { | |
86530b0a | 1741 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1742 | } |
3dc035f1 | 1743 | } |
2a12fefd | 1744 | |
3dc035f1 L |
1745 | fd = open(path, O_CREAT | O_EXCL, S_IXUSR | S_IXGRP | S_IXOTH); |
1746 | if (fd < 0) { | |
1747 | if (errno != EEXIST) { | |
86530b0a | 1748 | SYSERROR("Failed to create console"); |
3dc035f1 | 1749 | return -errno; |
2a12fefd | 1750 | } |
3dc035f1 L |
1751 | } else { |
1752 | close(fd); | |
7c6ef2a2 SH |
1753 | } |
1754 | ||
86530b0a L |
1755 | ret = chmod(console->name, S_IXUSR | S_IXGRP | S_IXOTH); |
1756 | if (ret < 0) { | |
0fd73091 CB |
1757 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
1758 | S_IXUSR | S_IXGRP | S_IXOTH, console->name); | |
2a12fefd CB |
1759 | return -errno; |
1760 | } | |
1761 | ||
3dc035f1 | 1762 | /* bind mount console->name to '/dev/<ttydir>/console' */ |
86530b0a L |
1763 | ret = safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs_path); |
1764 | if (ret < 0) { | |
0fd73091 | 1765 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
7c6ef2a2 SH |
1766 | return -1; |
1767 | } | |
86530b0a | 1768 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1769 | |
1770 | /* bind mount '/dev/<ttydir>/console' to '/dev/console' */ | |
86530b0a L |
1771 | ret = safe_mount(lxcpath, path, "none", MS_BIND, 0, rootfs_path); |
1772 | if (ret < 0) { | |
0fd73091 | 1773 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1774 | return -1; |
1775 | } | |
86530b0a | 1776 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 | 1777 | |
86530b0a | 1778 | DEBUG("Console has been setup under \"%s\" and mounted to \"%s\"", lxcpath, path); |
6e590161 | 1779 | return 0; |
1780 | } | |
1781 | ||
3d7d929a | 1782 | static int lxc_setup_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1783 | const struct lxc_terminal *console, char *ttydir) |
7c6ef2a2 | 1784 | { |
3d7d929a | 1785 | |
7c6ef2a2 | 1786 | if (!ttydir) |
3d7d929a | 1787 | return lxc_setup_dev_console(rootfs, console); |
7c6ef2a2 | 1788 | |
3d7d929a | 1789 | return lxc_setup_ttydir_console(rootfs, console, ttydir); |
7c6ef2a2 SH |
1790 | } |
1791 | ||
998ac676 RT |
1792 | static void parse_mntopt(char *opt, unsigned long *flags, char **data) |
1793 | { | |
1794 | struct mount_opt *mo; | |
1795 | ||
1796 | /* If opt is found in mount_opt, set or clear flags. | |
1797 | * Otherwise append it to data. */ | |
1798 | ||
1799 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
0fd73091 | 1800 | if (strncmp(opt, mo->name, strlen(mo->name)) == 0) { |
998ac676 RT |
1801 | if (mo->clear) |
1802 | *flags &= ~mo->flag; | |
1803 | else | |
1804 | *flags |= mo->flag; | |
1805 | return; | |
1806 | } | |
1807 | } | |
1808 | ||
1809 | if (strlen(*data)) | |
1810 | strcat(*data, ","); | |
1811 | strcat(*data, opt); | |
1812 | } | |
1813 | ||
0fd73091 | 1814 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, char **mntdata) |
998ac676 | 1815 | { |
0fd73091 CB |
1816 | char *data, *p, *s; |
1817 | char *saveptr = NULL; | |
998ac676 | 1818 | |
911324ef | 1819 | *mntdata = NULL; |
91656ce5 | 1820 | *mntflags = 0L; |
911324ef DL |
1821 | |
1822 | if (!mntopts) | |
998ac676 RT |
1823 | return 0; |
1824 | ||
911324ef | 1825 | s = strdup(mntopts); |
0fd73091 | 1826 | if (!s) |
998ac676 | 1827 | return -1; |
998ac676 RT |
1828 | |
1829 | data = malloc(strlen(s) + 1); | |
1830 | if (!data) { | |
998ac676 RT |
1831 | free(s); |
1832 | return -1; | |
1833 | } | |
1834 | *data = 0; | |
1835 | ||
0fd73091 | 1836 | for (; (p = strtok_r(s, ",", &saveptr)); s = NULL) |
998ac676 RT |
1837 | parse_mntopt(p, mntflags, &data); |
1838 | ||
1839 | if (*data) | |
1840 | *mntdata = data; | |
1841 | else | |
1842 | free(data); | |
1843 | free(s); | |
1844 | ||
1845 | return 0; | |
1846 | } | |
1847 | ||
d840039e YT |
1848 | static void parse_propagationopt(char *opt, unsigned long *flags) |
1849 | { | |
1850 | struct mount_opt *mo; | |
1851 | ||
1852 | /* If opt is found in propagation_opt, set or clear flags. */ | |
d840039e | 1853 | for (mo = &propagation_opt[0]; mo->name != NULL; mo++) { |
0fd73091 CB |
1854 | if (strncmp(opt, mo->name, strlen(mo->name)) != 0) |
1855 | continue; | |
1856 | ||
1857 | if (mo->clear) | |
1858 | *flags &= ~mo->flag; | |
1859 | else | |
1860 | *flags |= mo->flag; | |
1861 | ||
1862 | return; | |
d840039e YT |
1863 | } |
1864 | } | |
1865 | ||
1866 | static int parse_propagationopts(const char *mntopts, unsigned long *pflags) | |
1867 | { | |
0fd73091 CB |
1868 | char *p, *s; |
1869 | char *saveptr = NULL; | |
d840039e YT |
1870 | |
1871 | if (!mntopts) | |
1872 | return 0; | |
1873 | ||
1874 | s = strdup(mntopts); | |
1875 | if (!s) { | |
1876 | SYSERROR("Failed to allocate memory"); | |
1877 | return -ENOMEM; | |
1878 | } | |
1879 | ||
0fd73091 CB |
1880 | *pflags = 0L; |
1881 | for (; (p = strtok_r(s, ",", &saveptr)); s = NULL) | |
d840039e | 1882 | parse_propagationopt(p, pflags); |
d840039e | 1883 | free(s); |
0fd73091 | 1884 | |
d840039e YT |
1885 | return 0; |
1886 | } | |
1887 | ||
6fd5e769 SH |
1888 | static void null_endofword(char *word) |
1889 | { | |
1890 | while (*word && *word != ' ' && *word != '\t') | |
1891 | word++; | |
1892 | *word = '\0'; | |
1893 | } | |
1894 | ||
0fd73091 | 1895 | /* skip @nfields spaces in @src */ |
6fd5e769 SH |
1896 | static char *get_field(char *src, int nfields) |
1897 | { | |
6fd5e769 | 1898 | int i; |
0fd73091 | 1899 | char *p = src; |
6fd5e769 SH |
1900 | |
1901 | for (i = 0; i < nfields; i++) { | |
1902 | while (*p && *p != ' ' && *p != '\t') | |
1903 | p++; | |
0fd73091 | 1904 | |
6fd5e769 SH |
1905 | if (!*p) |
1906 | break; | |
0fd73091 | 1907 | |
6fd5e769 SH |
1908 | p++; |
1909 | } | |
0fd73091 | 1910 | |
6fd5e769 SH |
1911 | return p; |
1912 | } | |
1913 | ||
911324ef DL |
1914 | static int mount_entry(const char *fsname, const char *target, |
1915 | const char *fstype, unsigned long mountflags, | |
d840039e YT |
1916 | unsigned long pflags, const char *data, bool optional, |
1917 | bool dev, bool relative, const char *rootfs) | |
911324ef | 1918 | { |
0ac4b28a | 1919 | int ret; |
181437fd YT |
1920 | char srcbuf[MAXPATHLEN]; |
1921 | const char *srcpath = fsname; | |
614305f3 | 1922 | #ifdef HAVE_STATVFS |
2938f7c8 | 1923 | struct statvfs sb; |
614305f3 | 1924 | #endif |
2938f7c8 | 1925 | |
181437fd YT |
1926 | if (relative) { |
1927 | ret = snprintf(srcbuf, MAXPATHLEN, "%s/%s", rootfs ? rootfs : "/", fsname ? fsname : ""); | |
1928 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1929 | ERROR("source path is too long"); | |
1930 | return -1; | |
1931 | } | |
1932 | srcpath = srcbuf; | |
1933 | } | |
1934 | ||
1935 | ret = safe_mount(srcpath, target, fstype, mountflags & ~MS_REMOUNT, data, | |
0ac4b28a CB |
1936 | rootfs); |
1937 | if (ret < 0) { | |
1fc64d22 | 1938 | if (optional) { |
0fd73091 CB |
1939 | INFO("%s - Failed to mount \"%s\" on \"%s\" " |
1940 | "(optional)", strerror(errno), | |
1941 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
1942 | return 0; |
1943 | } | |
0ac4b28a | 1944 | |
0103eb53 | 1945 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 1946 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 1947 | return -1; |
911324ef DL |
1948 | } |
1949 | ||
1950 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
7c5b6e7c | 1951 | unsigned long rqd_flags = 0; |
0ac4b28a CB |
1952 | |
1953 | DEBUG("Remounting \"%s\" on \"%s\" to respect bind or remount " | |
181437fd | 1954 | "options", srcpath ? srcpath : "(none)", target ? target : "(none)"); |
0ac4b28a | 1955 | |
7c5b6e7c AS |
1956 | if (mountflags & MS_RDONLY) |
1957 | rqd_flags |= MS_RDONLY; | |
614305f3 | 1958 | #ifdef HAVE_STATVFS |
181437fd | 1959 | if (srcpath && statvfs(srcpath, &sb) == 0) { |
7c5b6e7c | 1960 | unsigned long required_flags = rqd_flags; |
0ac4b28a | 1961 | |
2938f7c8 SH |
1962 | if (sb.f_flag & MS_NOSUID) |
1963 | required_flags |= MS_NOSUID; | |
0ac4b28a | 1964 | |
ae7a770e | 1965 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 | 1966 | required_flags |= MS_NODEV; |
0ac4b28a | 1967 | |
2938f7c8 SH |
1968 | if (sb.f_flag & MS_RDONLY) |
1969 | required_flags |= MS_RDONLY; | |
0ac4b28a | 1970 | |
2938f7c8 SH |
1971 | if (sb.f_flag & MS_NOEXEC) |
1972 | required_flags |= MS_NOEXEC; | |
0ac4b28a CB |
1973 | |
1974 | DEBUG("Flags for \"%s\" were %lu, required extra flags " | |
181437fd | 1975 | "are %lu", srcpath, sb.f_flag, required_flags); |
0ac4b28a CB |
1976 | |
1977 | /* If this was a bind mount request, and required_flags | |
2938f7c8 | 1978 | * does not have any flags which are not already in |
0ac4b28a | 1979 | * mountflags, then skip the remount. |
2938f7c8 SH |
1980 | */ |
1981 | if (!(mountflags & MS_REMOUNT)) { | |
0ac4b28a CB |
1982 | if (!(required_flags & ~mountflags) && |
1983 | rqd_flags == 0) { | |
1984 | DEBUG("Mountflags already were %lu, " | |
1985 | "skipping remount", mountflags); | |
2938f7c8 SH |
1986 | goto skipremount; |
1987 | } | |
1988 | } | |
0ac4b28a | 1989 | |
2938f7c8 | 1990 | mountflags |= required_flags; |
6fd5e769 | 1991 | } |
614305f3 | 1992 | #endif |
911324ef | 1993 | |
181437fd | 1994 | ret = mount(srcpath, target, fstype, mountflags | MS_REMOUNT, data); |
0ac4b28a | 1995 | if (ret < 0) { |
1fc64d22 | 1996 | if (optional) { |
0ac4b28a | 1997 | INFO("Failed to mount \"%s\" on \"%s\" " |
0103eb53 | 1998 | "(optional): %s", |
181437fd | 1999 | srcpath ? srcpath : "(null)", target, |
0ac4b28a | 2000 | strerror(errno)); |
1fc64d22 SG |
2001 | return 0; |
2002 | } | |
0ac4b28a | 2003 | |
0103eb53 | 2004 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2005 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2006 | return -1; |
911324ef DL |
2007 | } |
2008 | } | |
2009 | ||
d840039e YT |
2010 | if (pflags) { |
2011 | ret = mount(NULL, target, NULL, pflags, NULL); | |
2012 | if (ret < 0) { | |
2013 | if (optional) { | |
2014 | INFO("%s - Failed to change mount propagation " | |
2015 | "for \"%s\" (optional)", strerror(errno), target); | |
2016 | return 0; | |
2017 | } else { | |
2018 | SYSERROR("Failed to change mount propagation " | |
2019 | "for \"%s\" (optional)", target); | |
2020 | return -1; | |
2021 | } | |
2022 | } | |
2023 | DEBUG("Changed mount propagation for \"%s\"", target); | |
2024 | } | |
2025 | ||
2026 | ||
614305f3 | 2027 | #ifdef HAVE_STATVFS |
6fd5e769 | 2028 | skipremount: |
614305f3 | 2029 | #endif |
0103eb53 | 2030 | DEBUG("Mounted \"%s\" on \"%s\" with filesystem type \"%s\"", |
181437fd | 2031 | srcpath ? srcpath : "(null)", target, fstype); |
911324ef DL |
2032 | |
2033 | return 0; | |
2034 | } | |
2035 | ||
c5e30de4 | 2036 | /* Remove "optional", "create=dir", and "create=file" from mntopt */ |
4e4ca161 SH |
2037 | static void cull_mntent_opt(struct mntent *mntent) |
2038 | { | |
2039 | int i; | |
0fd73091 CB |
2040 | char *list[] = { |
2041 | "create=dir", | |
2042 | "create=file", | |
2043 | "optional", | |
2044 | "relative", | |
2045 | NULL | |
2046 | }; | |
c5e30de4 CB |
2047 | |
2048 | for (i = 0; list[i]; i++) { | |
2049 | char *p, *p2; | |
2050 | ||
2051 | p = strstr(mntent->mnt_opts, list[i]); | |
2052 | if (!p) | |
4e4ca161 | 2053 | continue; |
c5e30de4 | 2054 | |
4e4ca161 SH |
2055 | p2 = strchr(p, ','); |
2056 | if (!p2) { | |
2057 | /* no more mntopts, so just chop it here */ | |
2058 | *p = '\0'; | |
2059 | continue; | |
2060 | } | |
c5e30de4 CB |
2061 | |
2062 | memmove(p, p2 + 1, strlen(p2 + 1) + 1); | |
4e4ca161 SH |
2063 | } |
2064 | } | |
2065 | ||
4d5b72a1 | 2066 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
749f98d9 CB |
2067 | const char *path, |
2068 | const struct lxc_rootfs *rootfs, | |
0fd73091 | 2069 | const char *lxc_name, const char *lxc_path) |
0ad19a3f | 2070 | { |
12e6ab5d CB |
2071 | int fd, ret; |
2072 | char *p1, *p2; | |
911324ef | 2073 | |
12e6ab5d | 2074 | if (strncmp(mntent->mnt_type, "overlay", 7) == 0) { |
749f98d9 | 2075 | ret = ovl_mkdir(mntent, rootfs, lxc_name, lxc_path); |
12e6ab5d CB |
2076 | if (ret < 0) |
2077 | return -1; | |
2078 | } | |
6e46cc0d | 2079 | |
34cfffb3 | 2080 | if (hasmntopt(mntent, "create=dir")) { |
749f98d9 CB |
2081 | ret = mkdir_p(path, 0755); |
2082 | if (ret < 0 && errno != EEXIST) { | |
2083 | SYSERROR("Failed to create directory \"%s\"", path); | |
2084 | return -1; | |
34cfffb3 SG |
2085 | } |
2086 | } | |
2087 | ||
0fd73091 CB |
2088 | if (!hasmntopt(mntent, "create=file")) |
2089 | return 0; | |
749f98d9 | 2090 | |
0fd73091 CB |
2091 | ret = access(path, F_OK); |
2092 | if (ret == 0) | |
2093 | return 0; | |
749f98d9 | 2094 | |
0fd73091 CB |
2095 | p1 = strdup(path); |
2096 | if (!p1) | |
2097 | return -1; | |
749f98d9 | 2098 | |
0fd73091 | 2099 | p2 = dirname(p1); |
749f98d9 | 2100 | |
0fd73091 CB |
2101 | ret = mkdir_p(p2, 0755); |
2102 | free(p1); | |
2103 | if (ret < 0 && errno != EEXIST) { | |
2104 | SYSERROR("Failed to create directory \"%s\"", path); | |
2105 | return -1; | |
34cfffb3 | 2106 | } |
749f98d9 | 2107 | |
0fd73091 CB |
2108 | fd = open(path, O_CREAT, 0644); |
2109 | if (fd < 0) | |
2110 | return -1; | |
2111 | close(fd); | |
2112 | ||
749f98d9 | 2113 | return 0; |
4d5b72a1 NC |
2114 | } |
2115 | ||
ec50007f CB |
2116 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
2117 | * without a rootfs. */ | |
db4aba38 | 2118 | static inline int mount_entry_on_generic(struct mntent *mntent, |
d8b712bc CB |
2119 | const char *path, |
2120 | const struct lxc_rootfs *rootfs, | |
2121 | const char *lxc_name, | |
2122 | const char *lxc_path) | |
4d5b72a1 | 2123 | { |
d8b712bc | 2124 | int ret; |
949d0338 | 2125 | unsigned long mntflags; |
4d5b72a1 | 2126 | char *mntdata; |
181437fd | 2127 | bool dev, optional, relative; |
949d0338 | 2128 | unsigned long pflags = 0; |
ec50007f | 2129 | char *rootfs_path = NULL; |
d8b712bc CB |
2130 | |
2131 | optional = hasmntopt(mntent, "optional") != NULL; | |
2132 | dev = hasmntopt(mntent, "dev") != NULL; | |
181437fd | 2133 | relative = hasmntopt(mntent, "relative") != NULL; |
d8b712bc | 2134 | |
ec50007f CB |
2135 | if (rootfs && rootfs->path) |
2136 | rootfs_path = rootfs->mount; | |
2137 | ||
d8b712bc CB |
2138 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, |
2139 | lxc_path); | |
2140 | if (ret < 0) { | |
2141 | if (optional) | |
2142 | return 0; | |
608e3567 | 2143 | |
d8b712bc CB |
2144 | return -1; |
2145 | } | |
4e4ca161 SH |
2146 | cull_mntent_opt(mntent); |
2147 | ||
d840039e YT |
2148 | ret = parse_propagationopts(mntent->mnt_opts, &pflags); |
2149 | if (ret < 0) | |
2150 | return -1; | |
2151 | ||
d8b712bc CB |
2152 | ret = parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata); |
2153 | if (ret < 0) | |
a17b1e65 | 2154 | return -1; |
a17b1e65 | 2155 | |
6e46cc0d | 2156 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
d840039e | 2157 | pflags, mntdata, optional, dev, relative, rootfs_path); |
68c152ef | 2158 | |
911324ef | 2159 | free(mntdata); |
911324ef DL |
2160 | return ret; |
2161 | } | |
2162 | ||
db4aba38 NC |
2163 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
2164 | { | |
1433c9f9 | 2165 | int ret; |
07667a6a | 2166 | char path[MAXPATHLEN]; |
1433c9f9 CB |
2167 | |
2168 | /* For containers created without a rootfs all mounts are treated as | |
07667a6a CB |
2169 | * absolute paths starting at / on the host. |
2170 | */ | |
1433c9f9 CB |
2171 | if (mntent->mnt_dir[0] != '/') |
2172 | ret = snprintf(path, sizeof(path), "/%s", mntent->mnt_dir); | |
2173 | else | |
2174 | ret = snprintf(path, sizeof(path), "%s", mntent->mnt_dir); | |
07667a6a | 2175 | if (ret < 0 || ret >= sizeof(path)) |
1433c9f9 | 2176 | return -1; |
1433c9f9 CB |
2177 | |
2178 | return mount_entry_on_generic(mntent, path, NULL, NULL, NULL); | |
db4aba38 NC |
2179 | } |
2180 | ||
4e4ca161 | 2181 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 | 2182 | const struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2183 | const char *lxc_name, |
2184 | const char *lxc_path) | |
911324ef | 2185 | { |
bdd2b34c | 2186 | int offset; |
013bd428 | 2187 | char *aux; |
67e571de | 2188 | const char *lxcpath; |
bdd2b34c CB |
2189 | char path[MAXPATHLEN]; |
2190 | int ret = 0; | |
0ad19a3f | 2191 | |
593e8478 | 2192 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
bdd2b34c | 2193 | if (!lxcpath) |
2a59a681 | 2194 | return -1; |
2a59a681 | 2195 | |
bdd2b34c CB |
2196 | /* If rootfs->path is a blockdev path, allow container fstab to use |
2197 | * <lxcpath>/<name>/rootfs" as the target prefix. | |
2198 | */ | |
2199 | ret = snprintf(path, MAXPATHLEN, "%s/%s/rootfs", lxcpath, lxc_name); | |
2200 | if (ret < 0 || ret >= MAXPATHLEN) | |
80a881b2 SH |
2201 | goto skipvarlib; |
2202 | ||
2203 | aux = strstr(mntent->mnt_dir, path); | |
2204 | if (aux) { | |
2205 | offset = strlen(path); | |
2206 | goto skipabs; | |
2207 | } | |
2208 | ||
2209 | skipvarlib: | |
013bd428 DL |
2210 | aux = strstr(mntent->mnt_dir, rootfs->path); |
2211 | if (!aux) { | |
bdd2b34c | 2212 | WARN("Ignoring mount point \"%s\"", mntent->mnt_dir); |
db4aba38 | 2213 | return ret; |
013bd428 | 2214 | } |
80a881b2 SH |
2215 | offset = strlen(rootfs->path); |
2216 | ||
2217 | skipabs: | |
bdd2b34c CB |
2218 | ret = snprintf(path, MAXPATHLEN, "%s/%s", rootfs->mount, aux + offset); |
2219 | if (ret < 0 || ret >= MAXPATHLEN) | |
a17b1e65 | 2220 | return -1; |
a17b1e65 | 2221 | |
0a2dddd4 | 2222 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef | 2223 | } |
d330fe7b | 2224 | |
4e4ca161 | 2225 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
0a2dddd4 CB |
2226 | const struct lxc_rootfs *rootfs, |
2227 | const char *lxc_name, | |
2228 | const char *lxc_path) | |
911324ef | 2229 | { |
911324ef | 2230 | int ret; |
0fd73091 | 2231 | char path[MAXPATHLEN]; |
d330fe7b | 2232 | |
34cfffb3 | 2233 | /* relative to root mount point */ |
6e46cc0d | 2234 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs->mount, mntent->mnt_dir); |
0fd73091 | 2235 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
9ba8130c | 2236 | return -1; |
911324ef | 2237 | |
0a2dddd4 | 2238 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef DL |
2239 | } |
2240 | ||
06749971 CB |
2241 | static int mount_file_entries(const struct lxc_conf *conf, |
2242 | const struct lxc_rootfs *rootfs, FILE *file, | |
1ae3c19f | 2243 | const char *lxc_name, const char *lxc_path) |
911324ef | 2244 | { |
aaf901be | 2245 | char buf[4096]; |
0fd73091 | 2246 | struct mntent mntent; |
911324ef | 2247 | int ret = -1; |
e76b8764 | 2248 | |
aaf901be | 2249 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
1ae3c19f CB |
2250 | if (!rootfs->path) |
2251 | ret = mount_entry_on_systemfs(&mntent); | |
2252 | else if (mntent.mnt_dir[0] != '/') | |
2253 | ret = mount_entry_on_relative_rootfs(&mntent, rootfs, | |
2254 | lxc_name, lxc_path); | |
2255 | else | |
2256 | ret = mount_entry_on_absolute_rootfs(&mntent, rootfs, | |
2257 | lxc_name, lxc_path); | |
2258 | if (ret < 0) | |
2259 | return -1; | |
0ad19a3f | 2260 | } |
2261 | ret = 0; | |
cd54d859 | 2262 | |
0fd73091 | 2263 | INFO("Finished setting up mounts"); |
e7938e9e MN |
2264 | return ret; |
2265 | } | |
2266 | ||
06749971 CB |
2267 | static int setup_mount(const struct lxc_conf *conf, |
2268 | const struct lxc_rootfs *rootfs, const char *fstab, | |
42dff448 | 2269 | const char *lxc_name, const char *lxc_path) |
e7938e9e | 2270 | { |
42dff448 | 2271 | FILE *f; |
e7938e9e MN |
2272 | int ret; |
2273 | ||
2274 | if (!fstab) | |
2275 | return 0; | |
2276 | ||
42dff448 CB |
2277 | f = setmntent(fstab, "r"); |
2278 | if (!f) { | |
2279 | SYSERROR("Failed to open \"%s\"", fstab); | |
e7938e9e MN |
2280 | return -1; |
2281 | } | |
2282 | ||
06749971 | 2283 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
42dff448 CB |
2284 | if (ret < 0) |
2285 | ERROR("Failed to set up mount entries"); | |
e7938e9e | 2286 | |
42dff448 | 2287 | endmntent(f); |
0ad19a3f | 2288 | return ret; |
2289 | } | |
2290 | ||
5ef5c9a3 | 2291 | FILE *make_anonymous_mount_file(struct lxc_list *mount) |
e7938e9e | 2292 | { |
5ef5c9a3 | 2293 | int ret; |
e7938e9e | 2294 | char *mount_entry; |
5ef5c9a3 | 2295 | struct lxc_list *iterator; |
5ef5c9a3 CB |
2296 | int fd = -1; |
2297 | ||
0fd73091 | 2298 | fd = memfd_create(".lxc_mount_file", MFD_CLOEXEC); |
5ef5c9a3 | 2299 | if (fd < 0) { |
a324e7eb CB |
2300 | char template[] = P_tmpdir "/.lxc_mount_file_XXXXXX"; |
2301 | ||
5ef5c9a3 CB |
2302 | if (errno != ENOSYS) |
2303 | return NULL; | |
a324e7eb CB |
2304 | |
2305 | fd = lxc_make_tmpfile(template, true); | |
0fd73091 CB |
2306 | if (fd < 0) { |
2307 | SYSERROR("Could not create temporary mount file"); | |
2308 | return NULL; | |
2309 | } | |
2310 | ||
6bd04140 | 2311 | TRACE("Created temporary mount file"); |
5ef5c9a3 | 2312 | } |
0fd73091 CB |
2313 | if (fd < 0) { |
2314 | SYSERROR("Could not create temporary mount file"); | |
9fc7f8c0 | 2315 | return NULL; |
e7938e9e MN |
2316 | } |
2317 | ||
0fd73091 CB |
2318 | lxc_list_for_each (iterator, mount) { |
2319 | size_t len; | |
2320 | ||
e7938e9e | 2321 | mount_entry = iterator->elem; |
0fd73091 | 2322 | len = strlen(mount_entry); |
5ef5c9a3 | 2323 | |
0fd73091 CB |
2324 | ret = write(fd, mount_entry, len); |
2325 | if (ret != len) | |
2326 | goto on_error; | |
2327 | ||
2328 | ret = write(fd, "\n", 1); | |
2329 | if (ret != 1) | |
2330 | goto on_error; | |
e7938e9e MN |
2331 | } |
2332 | ||
0fd73091 CB |
2333 | ret = lseek(fd, 0, SEEK_SET); |
2334 | if (ret < 0) | |
2335 | goto on_error; | |
2336 | ||
2337 | return fdopen(fd, "r+"); | |
2338 | ||
2339 | on_error: | |
2340 | SYSERROR("Failed to write mount entry to temporary mount file"); | |
2341 | close(fd); | |
2342 | return NULL; | |
9fc7f8c0 TA |
2343 | } |
2344 | ||
06749971 CB |
2345 | static int setup_mount_entries(const struct lxc_conf *conf, |
2346 | const struct lxc_rootfs *rootfs, | |
5ef5c9a3 CB |
2347 | struct lxc_list *mount, const char *lxc_name, |
2348 | const char *lxc_path) | |
9fc7f8c0 | 2349 | { |
9fc7f8c0 | 2350 | int ret; |
0fd73091 | 2351 | FILE *f; |
9fc7f8c0 | 2352 | |
19b5d755 CB |
2353 | f = make_anonymous_mount_file(mount); |
2354 | if (!f) | |
9fc7f8c0 | 2355 | return -1; |
e7938e9e | 2356 | |
06749971 | 2357 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
19b5d755 | 2358 | fclose(f); |
0fd73091 | 2359 | |
e7938e9e MN |
2360 | return ret; |
2361 | } | |
2362 | ||
bab88e68 CS |
2363 | static int parse_cap(const char *cap) |
2364 | { | |
84760c11 | 2365 | size_t i; |
2366 | int capid = -1; | |
0fd73091 CB |
2367 | size_t end = sizeof(caps_opt) / sizeof(caps_opt[0]); |
2368 | char *ptr = NULL; | |
bab88e68 | 2369 | |
0fd73091 | 2370 | if (strcmp(cap, "none") == 0) |
7035407c DE |
2371 | return -2; |
2372 | ||
8560cd36 | 2373 | for (i = 0; i < end; i++) { |
bab88e68 CS |
2374 | if (strcmp(cap, caps_opt[i].name)) |
2375 | continue; | |
2376 | ||
2377 | capid = caps_opt[i].value; | |
2378 | break; | |
2379 | } | |
2380 | ||
2381 | if (capid < 0) { | |
0fd73091 CB |
2382 | /* Try to see if it's numeric, so the user may specify |
2383 | * capabilities that the running kernel knows about but we | |
2384 | * don't | |
2385 | */ | |
bab88e68 CS |
2386 | errno = 0; |
2387 | capid = strtol(cap, &ptr, 10); | |
2388 | if (!ptr || *ptr != '\0' || errno != 0) | |
2389 | /* not a valid number */ | |
2390 | capid = -1; | |
2391 | else if (capid > lxc_caps_last_cap()) | |
2392 | /* we have a number but it's not a valid | |
2393 | * capability */ | |
2394 | capid = -1; | |
2395 | } | |
2396 | ||
2397 | return capid; | |
2398 | } | |
2399 | ||
0769b82a CS |
2400 | int in_caplist(int cap, struct lxc_list *caps) |
2401 | { | |
0769b82a | 2402 | int capid; |
0fd73091 | 2403 | struct lxc_list *iterator; |
0769b82a | 2404 | |
0fd73091 | 2405 | lxc_list_for_each (iterator, caps) { |
0769b82a CS |
2406 | capid = parse_cap(iterator->elem); |
2407 | if (capid == cap) | |
2408 | return 1; | |
2409 | } | |
2410 | ||
2411 | return 0; | |
2412 | } | |
2413 | ||
81810dd1 DL |
2414 | static int setup_caps(struct lxc_list *caps) |
2415 | { | |
bab88e68 | 2416 | int capid; |
0fd73091 CB |
2417 | char *drop_entry; |
2418 | struct lxc_list *iterator; | |
81810dd1 | 2419 | |
0fd73091 CB |
2420 | lxc_list_for_each (iterator, caps) { |
2421 | int ret; | |
81810dd1 DL |
2422 | |
2423 | drop_entry = iterator->elem; | |
2424 | ||
bab88e68 | 2425 | capid = parse_cap(drop_entry); |
0fd73091 | 2426 | if (capid < 0) { |
1e11be34 DL |
2427 | ERROR("unknown capability %s", drop_entry); |
2428 | return -1; | |
81810dd1 DL |
2429 | } |
2430 | ||
0fd73091 CB |
2431 | ret = prctl(PR_CAPBSET_DROP, capid, 0, 0, 0); |
2432 | if (ret < 0) { | |
2433 | SYSERROR("Failed to remove %s capability", drop_entry); | |
3ec1648d SH |
2434 | return -1; |
2435 | } | |
0fd73091 | 2436 | DEBUG("Dropped %s (%d) capability", drop_entry, capid); |
81810dd1 DL |
2437 | } |
2438 | ||
0fd73091 | 2439 | DEBUG("Capabilities have been setup"); |
1fb86a7c SH |
2440 | return 0; |
2441 | } | |
2442 | ||
2443 | static int dropcaps_except(struct lxc_list *caps) | |
2444 | { | |
0fd73091 | 2445 | int i, capid, numcaps; |
1fb86a7c | 2446 | char *keep_entry; |
0fd73091 | 2447 | struct lxc_list *iterator; |
1fb86a7c | 2448 | |
0fd73091 | 2449 | numcaps = lxc_caps_last_cap() + 1; |
2caf9a97 SH |
2450 | if (numcaps <= 0 || numcaps > 200) |
2451 | return -1; | |
0fd73091 | 2452 | TRACE("Found %d capabilities", numcaps); |
2caf9a97 | 2453 | |
1a0e70ac | 2454 | /* caplist[i] is 1 if we keep capability i */ |
1fb86a7c SH |
2455 | int *caplist = alloca(numcaps * sizeof(int)); |
2456 | memset(caplist, 0, numcaps * sizeof(int)); | |
2457 | ||
0fd73091 | 2458 | lxc_list_for_each (iterator, caps) { |
1fb86a7c SH |
2459 | keep_entry = iterator->elem; |
2460 | ||
bab88e68 | 2461 | capid = parse_cap(keep_entry); |
7035407c DE |
2462 | if (capid == -2) |
2463 | continue; | |
2464 | ||
0fd73091 CB |
2465 | if (capid < 0) { |
2466 | ERROR("Unknown capability %s", keep_entry); | |
1fb86a7c SH |
2467 | return -1; |
2468 | } | |
2469 | ||
0fd73091 | 2470 | DEBUG("Keep capability %s (%d)", keep_entry, capid); |
1fb86a7c SH |
2471 | caplist[capid] = 1; |
2472 | } | |
0fd73091 CB |
2473 | |
2474 | for (i = 0; i < numcaps; i++) { | |
2475 | int ret; | |
2476 | ||
1fb86a7c SH |
2477 | if (caplist[i]) |
2478 | continue; | |
0fd73091 CB |
2479 | |
2480 | ret = prctl(PR_CAPBSET_DROP, i, 0, 0, 0); | |
2481 | if (ret < 0) { | |
2482 | SYSERROR("Failed to remove capability %d", i); | |
3ec1648d SH |
2483 | return -1; |
2484 | } | |
1fb86a7c SH |
2485 | } |
2486 | ||
0fd73091 | 2487 | DEBUG("Capabilities have been setup"); |
81810dd1 DL |
2488 | return 0; |
2489 | } | |
2490 | ||
0fd73091 CB |
2491 | static int parse_resource(const char *res) |
2492 | { | |
2493 | int ret; | |
c6d09e15 WB |
2494 | size_t i; |
2495 | int resid = -1; | |
2496 | ||
0fd73091 | 2497 | for (i = 0; i < sizeof(limit_opt) / sizeof(limit_opt[0]); ++i) |
c6d09e15 WB |
2498 | if (strcmp(res, limit_opt[i].name) == 0) |
2499 | return limit_opt[i].value; | |
c6d09e15 | 2500 | |
0fd73091 | 2501 | /* Try to see if it's numeric, so the user may specify |
c6d09e15 | 2502 | * resources that the running kernel knows about but |
0fd73091 CB |
2503 | * we don't. |
2504 | */ | |
2505 | ret = lxc_safe_int(res, &resid); | |
2506 | if (ret < 0) | |
2507 | return -1; | |
2508 | ||
2509 | return resid; | |
c6d09e15 WB |
2510 | } |
2511 | ||
0fd73091 CB |
2512 | int setup_resource_limits(struct lxc_list *limits, pid_t pid) |
2513 | { | |
2514 | int resid; | |
c6d09e15 WB |
2515 | struct lxc_list *it; |
2516 | struct lxc_limit *lim; | |
c6d09e15 | 2517 | |
0fd73091 | 2518 | lxc_list_for_each (it, limits) { |
c6d09e15 WB |
2519 | lim = it->elem; |
2520 | ||
2521 | resid = parse_resource(lim->resource); | |
2522 | if (resid < 0) { | |
0fd73091 | 2523 | ERROR("Unknown resource %s", lim->resource); |
c6d09e15 WB |
2524 | return -1; |
2525 | } | |
2526 | ||
f48b5fd8 | 2527 | #if HAVE_PRLIMIT || HAVE_PRLIMIT64 |
c6d09e15 | 2528 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) { |
0fd73091 CB |
2529 | ERROR("Failed to set limit %s: %s", lim->resource, |
2530 | strerror(errno)); | |
c6d09e15 WB |
2531 | return -1; |
2532 | } | |
f48b5fd8 FF |
2533 | #else |
2534 | ERROR("Cannot set limit %s as prlimit is missing", lim->resource); | |
2535 | return -1; | |
2536 | #endif | |
c6d09e15 | 2537 | } |
0fd73091 | 2538 | |
c6d09e15 WB |
2539 | return 0; |
2540 | } | |
2541 | ||
7edd0540 L |
2542 | int setup_sysctl_parameters(struct lxc_list *sysctls) |
2543 | { | |
2544 | struct lxc_list *it; | |
2545 | struct lxc_sysctl *elem; | |
0fd73091 | 2546 | int ret = 0; |
7edd0540 L |
2547 | char *tmp = NULL; |
2548 | char filename[MAXPATHLEN] = {0}; | |
7edd0540 | 2549 | |
0fd73091 | 2550 | lxc_list_for_each (it, sysctls) { |
7edd0540 L |
2551 | elem = it->elem; |
2552 | tmp = lxc_string_replace(".", "/", elem->key); | |
2553 | if (!tmp) { | |
2554 | ERROR("Failed to replace key %s", elem->key); | |
2555 | return -1; | |
2556 | } | |
2557 | ||
2558 | ret = snprintf(filename, sizeof(filename), "/proc/sys/%s", tmp); | |
2559 | free(tmp); | |
2560 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { | |
2561 | ERROR("Error setting up sysctl parameters path"); | |
2562 | return -1; | |
2563 | } | |
2564 | ||
0fd73091 CB |
2565 | ret = lxc_write_to_file(filename, elem->value, |
2566 | strlen(elem->value), false); | |
7edd0540 | 2567 | if (ret < 0) { |
0fd73091 CB |
2568 | ERROR("Failed to setup sysctl parameters %s to %s", |
2569 | elem->key, elem->value); | |
7edd0540 L |
2570 | return -1; |
2571 | } | |
2572 | } | |
0fd73091 | 2573 | |
7edd0540 L |
2574 | return 0; |
2575 | } | |
2576 | ||
61d7a733 YT |
2577 | int setup_proc_filesystem(struct lxc_list *procs, pid_t pid) |
2578 | { | |
2579 | struct lxc_list *it; | |
2580 | struct lxc_proc *elem; | |
0fd73091 | 2581 | int ret = 0; |
61d7a733 YT |
2582 | char *tmp = NULL; |
2583 | char filename[MAXPATHLEN] = {0}; | |
61d7a733 | 2584 | |
0fd73091 | 2585 | lxc_list_for_each (it, procs) { |
61d7a733 YT |
2586 | elem = it->elem; |
2587 | tmp = lxc_string_replace(".", "/", elem->filename); | |
2588 | if (!tmp) { | |
2589 | ERROR("Failed to replace key %s", elem->filename); | |
2590 | return -1; | |
2591 | } | |
2592 | ||
2593 | ret = snprintf(filename, sizeof(filename), "/proc/%d/%s", pid, tmp); | |
2594 | free(tmp); | |
2595 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { | |
2596 | ERROR("Error setting up proc filesystem path"); | |
2597 | return -1; | |
2598 | } | |
2599 | ||
0fd73091 CB |
2600 | ret = lxc_write_to_file(filename, elem->value, |
2601 | strlen(elem->value), false); | |
61d7a733 | 2602 | if (ret < 0) { |
0fd73091 CB |
2603 | ERROR("Failed to setup proc filesystem %s to %s", |
2604 | elem->filename, elem->value); | |
61d7a733 YT |
2605 | return -1; |
2606 | } | |
2607 | } | |
0fd73091 | 2608 | |
61d7a733 YT |
2609 | return 0; |
2610 | } | |
2611 | ||
ae9242c8 SH |
2612 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2613 | ||
7b379ab3 | 2614 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2615 | { |
26ddeedd | 2616 | int i; |
0fd73091 | 2617 | struct lxc_conf *new; |
7b379ab3 | 2618 | |
13277ec4 | 2619 | new = malloc(sizeof(*new)); |
0fd73091 | 2620 | if (!new) |
7b379ab3 | 2621 | return NULL; |
7b379ab3 MN |
2622 | memset(new, 0, sizeof(*new)); |
2623 | ||
4b73005c | 2624 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
cccc74b5 | 2625 | new->personality = -1; |
124fa0a8 | 2626 | new->autodev = 1; |
3a784510 | 2627 | new->console.buffer_size = 0; |
596a818d DE |
2628 | new->console.log_path = NULL; |
2629 | new->console.log_fd = -1; | |
861813e5 | 2630 | new->console.log_size = 0; |
28a4b0e5 | 2631 | new->console.path = NULL; |
63376d7d | 2632 | new->console.peer = -1; |
fb87aa6a CB |
2633 | new->console.proxy.busy = -1; |
2634 | new->console.proxy.master = -1; | |
2635 | new->console.proxy.slave = -1; | |
63376d7d DL |
2636 | new->console.master = -1; |
2637 | new->console.slave = -1; | |
2638 | new->console.name[0] = '\0'; | |
732375f5 | 2639 | memset(&new->console.ringbuf, 0, sizeof(struct lxc_ringbuf)); |
d2e30e99 | 2640 | new->maincmd_fd = -1; |
76a26f55 | 2641 | new->nbd_idx = -1; |
54c30e29 | 2642 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 2643 | if (!new->rootfs.mount) { |
53f3f048 SH |
2644 | free(new); |
2645 | return NULL; | |
2646 | } | |
858377e4 | 2647 | new->logfd = -1; |
7b379ab3 | 2648 | lxc_list_init(&new->cgroup); |
54860ed0 | 2649 | lxc_list_init(&new->cgroup2); |
7b379ab3 MN |
2650 | lxc_list_init(&new->network); |
2651 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2652 | lxc_list_init(&new->caps); |
1fb86a7c | 2653 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2654 | lxc_list_init(&new->id_map); |
46ad64ab CB |
2655 | new->root_nsuid_map = NULL; |
2656 | new->root_nsgid_map = NULL; | |
f979ac15 | 2657 | lxc_list_init(&new->includes); |
4184c3e1 | 2658 | lxc_list_init(&new->aliens); |
7c661726 | 2659 | lxc_list_init(&new->environment); |
c6d09e15 | 2660 | lxc_list_init(&new->limits); |
7edd0540 | 2661 | lxc_list_init(&new->sysctls); |
61d7a733 | 2662 | lxc_list_init(&new->procs); |
44ae0fb6 | 2663 | new->hooks_version = 0; |
28d9e29e | 2664 | for (i = 0; i < NUM_LXC_HOOKS; i++) |
26ddeedd | 2665 | lxc_list_init(&new->hooks[i]); |
ee1e7aa0 | 2666 | lxc_list_init(&new->groups); |
d39b10eb | 2667 | lxc_list_init(&new->state_clients); |
fe4de9a6 DE |
2668 | new->lsm_aa_profile = NULL; |
2669 | new->lsm_se_context = NULL; | |
5112cd70 | 2670 | new->tmp_umount_proc = 0; |
7b379ab3 | 2671 | |
72bb04e4 PT |
2672 | /* if running in a new user namespace, init and COMMAND |
2673 | * default to running as UID/GID 0 when using lxc-execute */ | |
2674 | new->init_uid = 0; | |
2675 | new->init_gid = 0; | |
43654d34 | 2676 | memset(&new->cgroup_meta, 0, sizeof(struct lxc_cgroup)); |
b074bbf1 | 2677 | memset(&new->ns_share, 0, sizeof(char *) * LXC_NS_MAX); |
72bb04e4 | 2678 | |
7b379ab3 | 2679 | return new; |
089cd8b8 DL |
2680 | } |
2681 | ||
344c9d81 | 2682 | int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
a19b974f | 2683 | size_t buf_size) |
f6d3e3e4 | 2684 | { |
29053180 | 2685 | int fd, ret; |
0fd73091 | 2686 | char path[MAXPATHLEN]; |
f6d3e3e4 | 2687 | |
a19b974f CB |
2688 | if (geteuid() != 0 && idtype == ID_TYPE_GID) { |
2689 | size_t buflen; | |
2690 | ||
2691 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/setgroups", pid); | |
0fd73091 | 2692 | if (ret < 0 || ret >= MAXPATHLEN) |
a19b974f | 2693 | return -E2BIG; |
a19b974f CB |
2694 | |
2695 | fd = open(path, O_WRONLY); | |
2696 | if (fd < 0 && errno != ENOENT) { | |
2697 | SYSERROR("Failed to open \"%s\"", path); | |
2698 | return -1; | |
2699 | } | |
2700 | ||
2388737b CB |
2701 | if (fd >= 0) { |
2702 | buflen = sizeof("deny\n") - 1; | |
2703 | errno = 0; | |
2704 | ret = lxc_write_nointr(fd, "deny\n", buflen); | |
2705 | if (ret != buflen) { | |
0fd73091 CB |
2706 | SYSERROR("Failed to write \"deny\" to " |
2707 | "\"/proc/%d/setgroups\"", pid); | |
2388737b CB |
2708 | close(fd); |
2709 | return -1; | |
2710 | } | |
a19b974f | 2711 | close(fd); |
a19b974f | 2712 | } |
a19b974f CB |
2713 | } |
2714 | ||
29053180 CB |
2715 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/%cid_map", pid, |
2716 | idtype == ID_TYPE_UID ? 'u' : 'g'); | |
0fd73091 | 2717 | if (ret < 0 || ret >= MAXPATHLEN) |
f6d3e3e4 | 2718 | return -E2BIG; |
29053180 CB |
2719 | |
2720 | fd = open(path, O_WRONLY); | |
2721 | if (fd < 0) { | |
a19b974f | 2722 | SYSERROR("Failed to open \"%s\"", path); |
29053180 | 2723 | return -1; |
f6d3e3e4 | 2724 | } |
29053180 CB |
2725 | |
2726 | errno = 0; | |
2727 | ret = lxc_write_nointr(fd, buf, buf_size); | |
2728 | if (ret != buf_size) { | |
a19b974f | 2729 | SYSERROR("Failed to write %cid mapping to \"%s\"", |
29053180 CB |
2730 | idtype == ID_TYPE_UID ? 'u' : 'g', path); |
2731 | close(fd); | |
2732 | return -1; | |
2733 | } | |
2734 | close(fd); | |
2735 | ||
2736 | return 0; | |
f6d3e3e4 SH |
2737 | } |
2738 | ||
6e50e704 CB |
2739 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
2740 | * | |
2741 | * @return 1 if functional binary was found | |
2742 | * @return 0 if binary exists but is lacking privilege | |
2743 | * @return -ENOENT if binary does not exist | |
2744 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
6e50e704 | 2745 | */ |
df6a2945 CB |
2746 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
2747 | { | |
2748 | char *path; | |
2749 | int ret; | |
2750 | struct stat st; | |
2751 | int fret = 0; | |
2752 | ||
6e50e704 CB |
2753 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
2754 | return -EINVAL; | |
2755 | ||
df6a2945 CB |
2756 | path = on_path(binary, NULL); |
2757 | if (!path) | |
2758 | return -ENOENT; | |
2759 | ||
2760 | ret = stat(path, &st); | |
2761 | if (ret < 0) { | |
2762 | fret = -errno; | |
2763 | goto cleanup; | |
2764 | } | |
2765 | ||
2766 | /* Check if the binary is setuid. */ | |
2767 | if (st.st_mode & S_ISUID) { | |
0fd73091 | 2768 | DEBUG("The binary \"%s\" does have the setuid bit set", path); |
df6a2945 CB |
2769 | fret = 1; |
2770 | goto cleanup; | |
2771 | } | |
2772 | ||
0fd73091 | 2773 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
2774 | /* Check if it has the CAP_SETUID capability. */ |
2775 | if ((cap & CAP_SETUID) && | |
2776 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
2777 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) { | |
2778 | DEBUG("The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE " | |
0fd73091 | 2779 | "and CAP_PERMITTED sets", path); |
df6a2945 CB |
2780 | fret = 1; |
2781 | goto cleanup; | |
2782 | } | |
2783 | ||
2784 | /* Check if it has the CAP_SETGID capability. */ | |
2785 | if ((cap & CAP_SETGID) && | |
2786 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
2787 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) { | |
2788 | DEBUG("The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE " | |
0fd73091 | 2789 | "and CAP_PERMITTED sets", path); |
df6a2945 CB |
2790 | fret = 1; |
2791 | goto cleanup; | |
2792 | } | |
0fd73091 | 2793 | #else |
69924fff CB |
2794 | /* If we cannot check for file capabilities we need to give the benefit |
2795 | * of the doubt. Otherwise we might fail even though all the necessary | |
2796 | * file capabilities are set. | |
2797 | */ | |
d6018f88 | 2798 | DEBUG("Cannot check for file capabilites as full capability support is " |
0fd73091 | 2799 | "missing. Manual intervention needed"); |
d6018f88 | 2800 | fret = 1; |
0fd73091 | 2801 | #endif |
df6a2945 CB |
2802 | |
2803 | cleanup: | |
2804 | free(path); | |
2805 | return fret; | |
2806 | } | |
2807 | ||
986ef930 CB |
2808 | int lxc_map_ids_exec_wrapper(void *args) |
2809 | { | |
2810 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
2811 | return -1; | |
2812 | } | |
2813 | ||
f6d3e3e4 SH |
2814 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) |
2815 | { | |
0fd73091 | 2816 | int fill, left; |
986ef930 | 2817 | char u_or_g; |
4bc3b759 | 2818 | char *pos; |
986ef930 | 2819 | char cmd_output[MAXPATHLEN]; |
0fd73091 CB |
2820 | struct id_map *map; |
2821 | struct lxc_list *iterator; | |
2822 | enum idtype type; | |
986ef930 CB |
2823 | /* strlen("new@idmap") = 9 |
2824 | * + | |
2825 | * strlen(" ") = 1 | |
2826 | * + | |
2827 | * LXC_NUMSTRLEN64 | |
2828 | * + | |
2829 | * strlen(" ") = 1 | |
2830 | * | |
2831 | * We add some additional space to make sure that we really have | |
2832 | * LXC_IDMAPLEN bytes available for our the {g,u]id mapping. | |
2833 | */ | |
0fd73091 | 2834 | int ret = 0, gidmap = 0, uidmap = 0; |
986ef930 | 2835 | char mapbuf[9 + 1 + LXC_NUMSTRLEN64 + 1 + LXC_IDMAPLEN] = {0}; |
0fd73091 | 2836 | bool had_entry = false, use_shadow = false; |
df6a2945 CB |
2837 | |
2838 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid | |
2839 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
2840 | * will protected it by preventing another user from being handed the |
2841 | * range by shadow. | |
2842 | */ | |
df6a2945 | 2843 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
2844 | if (uidmap == -ENOENT) |
2845 | WARN("newuidmap binary is missing"); | |
2846 | else if (!uidmap) | |
2847 | WARN("newuidmap is lacking necessary privileges"); | |
2848 | ||
df6a2945 | 2849 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
2850 | if (gidmap == -ENOENT) |
2851 | WARN("newgidmap binary is missing"); | |
2852 | else if (!gidmap) | |
2853 | WARN("newgidmap is lacking necessary privileges"); | |
2854 | ||
df6a2945 | 2855 | if (uidmap > 0 && gidmap > 0) { |
0fd73091 | 2856 | DEBUG("Functional newuidmap and newgidmap binary found"); |
4bc3b759 | 2857 | use_shadow = true; |
df6a2945 | 2858 | } else { |
99d43365 CB |
2859 | /* In case unprivileged users run application containers via |
2860 | * execute() or a start*() there are valid cases where they may | |
2861 | * only want to map their own {g,u}id. Let's not block them from | |
2862 | * doing so by requiring geteuid() == 0. | |
2863 | */ | |
2864 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
0fd73091 | 2865 | "write directly with euid %d", geteuid()); |
0e6e3a41 | 2866 | } |
251d0d2a | 2867 | |
986ef930 CB |
2868 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
2869 | type++, u_or_g = 'g') { | |
2870 | pos = mapbuf; | |
2871 | ||
0e6e3a41 | 2872 | if (use_shadow) |
986ef930 | 2873 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 2874 | |
cf3ef16d | 2875 | lxc_list_for_each(iterator, idmap) { |
251d0d2a | 2876 | map = iterator->elem; |
cf3ef16d SH |
2877 | if (map->idtype != type) |
2878 | continue; | |
2879 | ||
4bc3b759 CB |
2880 | had_entry = true; |
2881 | ||
986ef930 | 2882 | left = LXC_IDMAPLEN - (pos - mapbuf); |
d1838f34 | 2883 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
2884 | use_shadow ? " " : "", map->nsid, |
2885 | map->hostid, map->range, | |
0e6e3a41 | 2886 | use_shadow ? "" : "\n"); |
a427e268 CB |
2887 | if (fill <= 0 || fill >= left) { |
2888 | /* The kernel only takes <= 4k for writes to | |
2889 | * /proc/<pid>/{g,u}id_map | |
2890 | */ | |
2891 | SYSERROR("Too many %cid mappings defined", u_or_g); | |
2892 | return -1; | |
2893 | } | |
4bc3b759 | 2894 | |
cf3ef16d | 2895 | pos += fill; |
251d0d2a | 2896 | } |
cf3ef16d | 2897 | if (!had_entry) |
4f7521b4 | 2898 | continue; |
cf3ef16d | 2899 | |
986ef930 CB |
2900 | /* Try to catch the ouput of new{g,u}idmap to make debugging |
2901 | * easier. | |
2902 | */ | |
2903 | if (use_shadow) { | |
2904 | ret = run_command(cmd_output, sizeof(cmd_output), | |
2905 | lxc_map_ids_exec_wrapper, | |
2906 | (void *)mapbuf); | |
2907 | if (ret < 0) { | |
54fbbeb5 CB |
2908 | ERROR("new%cidmap failed to write mapping \"%s\": %s", |
2909 | u_or_g, cmd_output, mapbuf); | |
986ef930 CB |
2910 | return -1; |
2911 | } | |
54fbbeb5 | 2912 | TRACE("new%cidmap wrote mapping \"%s\"", u_or_g, mapbuf); |
d1838f34 | 2913 | } else { |
986ef930 | 2914 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
54fbbeb5 | 2915 | if (ret < 0) { |
da0f9977 | 2916 | ERROR("Failed to write mapping: %s", mapbuf); |
986ef930 | 2917 | return -1; |
54fbbeb5 CB |
2918 | } |
2919 | TRACE("Wrote mapping \"%s\"", mapbuf); | |
d1838f34 | 2920 | } |
986ef930 CB |
2921 | |
2922 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 2923 | } |
251d0d2a | 2924 | |
986ef930 | 2925 | return 0; |
f6d3e3e4 SH |
2926 | } |
2927 | ||
0fd73091 | 2928 | /* Return the host uid/gid to which the container root is mapped in val. |
0b3a6504 | 2929 | * Return true if id was found, false otherwise. |
cf3ef16d | 2930 | */ |
2a9a80cb | 2931 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
4160c3a0 | 2932 | unsigned long *val) |
cf3ef16d | 2933 | { |
4160c3a0 | 2934 | unsigned nsid; |
0fd73091 CB |
2935 | struct id_map *map; |
2936 | struct lxc_list *it; | |
4160c3a0 CB |
2937 | |
2938 | if (idtype == ID_TYPE_UID) | |
2939 | nsid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; | |
2940 | else | |
2941 | nsid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
cf3ef16d | 2942 | |
0fd73091 | 2943 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 2944 | map = it->elem; |
7b50c609 | 2945 | if (map->idtype != idtype) |
cf3ef16d | 2946 | continue; |
4160c3a0 | 2947 | if (map->nsid != nsid) |
cf3ef16d | 2948 | continue; |
2a9a80cb SH |
2949 | *val = map->hostid; |
2950 | return true; | |
cf3ef16d | 2951 | } |
4160c3a0 | 2952 | |
2a9a80cb | 2953 | return false; |
cf3ef16d SH |
2954 | } |
2955 | ||
2133f58c | 2956 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 2957 | { |
cf3ef16d | 2958 | struct id_map *map; |
0fd73091 CB |
2959 | struct lxc_list *it; |
2960 | ||
2961 | lxc_list_for_each (it, &conf->id_map) { | |
cf3ef16d | 2962 | map = it->elem; |
2133f58c | 2963 | if (map->idtype != idtype) |
cf3ef16d | 2964 | continue; |
0fd73091 | 2965 | |
cf3ef16d | 2966 | if (id >= map->hostid && id < map->hostid + map->range) |
57d116ab | 2967 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 2968 | } |
0fd73091 | 2969 | |
57d116ab | 2970 | return -1; |
cf3ef16d SH |
2971 | } |
2972 | ||
339efad9 | 2973 | int find_unmapped_nsid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 2974 | { |
cf3ef16d | 2975 | struct id_map *map; |
0fd73091 | 2976 | struct lxc_list *it; |
2133f58c | 2977 | unsigned int freeid = 0; |
0fd73091 | 2978 | |
cf3ef16d | 2979 | again: |
0fd73091 | 2980 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 2981 | map = it->elem; |
2133f58c | 2982 | if (map->idtype != idtype) |
cf3ef16d | 2983 | continue; |
0fd73091 | 2984 | |
cf3ef16d SH |
2985 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { |
2986 | freeid = map->nsid + map->range; | |
2987 | goto again; | |
2988 | } | |
2989 | } | |
0fd73091 | 2990 | |
cf3ef16d SH |
2991 | return freeid; |
2992 | } | |
2993 | ||
f4f52cb5 CB |
2994 | int chown_mapped_root_exec_wrapper(void *args) |
2995 | { | |
2996 | execvp("lxc-usernsexec", args); | |
2997 | return -1; | |
2998 | } | |
2999 | ||
0fd73091 | 3000 | /* chown_mapped_root: for an unprivileged user with uid/gid X to |
7b50c609 TS |
3001 | * chown a dir to subuid/subgid Y, he needs to run chown as root |
3002 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
3003 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
3004 | * root is privileged with respect to hostuid/hostgid X, allowing | |
3005 | * him to do the chown. | |
f6d3e3e4 | 3006 | */ |
41dc7155 | 3007 | int chown_mapped_root(const char *path, struct lxc_conf *conf) |
f6d3e3e4 | 3008 | { |
f4f52cb5 | 3009 | uid_t rootuid, rootgid; |
2a9a80cb | 3010 | unsigned long val; |
f4f52cb5 CB |
3011 | int hostuid, hostgid, ret; |
3012 | struct stat sb; | |
3013 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
3014 | char ugid[100]; | |
41dc7155 | 3015 | const char *args1[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3016 | "-m", map1, |
3017 | "-m", map2, | |
3018 | "-m", map3, | |
3019 | "-m", map5, | |
3020 | "--", "chown", ugid, path, | |
3021 | NULL}; | |
41dc7155 | 3022 | const char *args2[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3023 | "-m", map1, |
3024 | "-m", map2, | |
3025 | "-m", map3, | |
3026 | "-m", map4, | |
3027 | "-m", map5, | |
3028 | "--", "chown", ugid, path, | |
3029 | NULL}; | |
3030 | char cmd_output[MAXPATHLEN]; | |
3031 | ||
3032 | hostuid = geteuid(); | |
3033 | hostgid = getegid(); | |
f6d3e3e4 | 3034 | |
2a9a80cb | 3035 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
bc80f098 | 3036 | ERROR("No uid mapping for container root"); |
c4d10a05 | 3037 | return -1; |
f6d3e3e4 | 3038 | } |
f4f52cb5 | 3039 | rootuid = (uid_t)val; |
0fd73091 | 3040 | |
7b50c609 | 3041 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { |
bc80f098 | 3042 | ERROR("No gid mapping for container root"); |
7b50c609 TS |
3043 | return -1; |
3044 | } | |
f4f52cb5 | 3045 | rootgid = (gid_t)val; |
2a9a80cb | 3046 | |
f4f52cb5 | 3047 | if (hostuid == 0) { |
7b50c609 | 3048 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3049 | ERROR("Error chowning %s", path); |
3050 | return -1; | |
3051 | } | |
0fd73091 | 3052 | |
c4d10a05 SH |
3053 | return 0; |
3054 | } | |
f3d7e4ca | 3055 | |
f4f52cb5 | 3056 | if (rootuid == hostuid) { |
1a0e70ac | 3057 | /* nothing to do */ |
b103ceac | 3058 | INFO("Container root is our uid; no need to chown"); |
f3d7e4ca SH |
3059 | return 0; |
3060 | } | |
3061 | ||
bbdbf8f0 | 3062 | /* save the current gid of "path" */ |
f4f52cb5 CB |
3063 | if (stat(path, &sb) < 0) { |
3064 | ERROR("Error stat %s", path); | |
f6d3e3e4 SH |
3065 | return -1; |
3066 | } | |
7b50c609 | 3067 | |
bbdbf8f0 CB |
3068 | /* Update the path argument in case this was overlayfs. */ |
3069 | args1[sizeof(args1) / sizeof(args1[0]) - 2] = path; | |
3070 | args2[sizeof(args2) / sizeof(args2[0]) - 2] = path; | |
3071 | ||
f4f52cb5 CB |
3072 | /* |
3073 | * A file has to be group-owned by a gid mapped into the | |
3074 | * container, or the container won't be privileged over it. | |
3075 | */ | |
3076 | DEBUG("trying to chown \"%s\" to %d", path, hostgid); | |
3077 | if (sb.st_uid == hostuid && | |
3078 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3079 | chown(path, -1, hostgid) < 0) { | |
3080 | ERROR("Failed chgrping %s", path); | |
3081 | return -1; | |
3082 | } | |
f6d3e3e4 | 3083 | |
1a0e70ac | 3084 | /* "u:0:rootuid:1" */ |
f4f52cb5 CB |
3085 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); |
3086 | if (ret < 0 || ret >= 100) { | |
3087 | ERROR("Error uid printing map string"); | |
3088 | return -1; | |
3089 | } | |
7b50c609 | 3090 | |
1a0e70ac | 3091 | /* "u:hostuid:hostuid:1" */ |
f4f52cb5 CB |
3092 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); |
3093 | if (ret < 0 || ret >= 100) { | |
3094 | ERROR("Error uid printing map string"); | |
3095 | return -1; | |
3096 | } | |
c4d10a05 | 3097 | |
1a0e70ac | 3098 | /* "g:0:rootgid:1" */ |
f4f52cb5 CB |
3099 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); |
3100 | if (ret < 0 || ret >= 100) { | |
3101 | ERROR("Error gid printing map string"); | |
3102 | return -1; | |
3103 | } | |
98e5ba51 | 3104 | |
1a0e70ac | 3105 | /* "g:pathgid:rootgid+pathgid:1" */ |
f4f52cb5 CB |
3106 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, |
3107 | rootgid + (gid_t)sb.st_gid); | |
3108 | if (ret < 0 || ret >= 100) { | |
3109 | ERROR("Error gid printing map string"); | |
3110 | return -1; | |
3111 | } | |
c4d10a05 | 3112 | |
1a0e70ac | 3113 | /* "g:hostgid:hostgid:1" */ |
f4f52cb5 CB |
3114 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); |
3115 | if (ret < 0 || ret >= 100) { | |
3116 | ERROR("Error gid printing map string"); | |
3117 | return -1; | |
3118 | } | |
7b50c609 | 3119 | |
1a0e70ac | 3120 | /* "0:pathgid" (chown) */ |
f4f52cb5 CB |
3121 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); |
3122 | if (ret < 0 || ret >= 100) { | |
3123 | ERROR("Error owner printing format string for chown"); | |
3124 | return -1; | |
3125 | } | |
7b50c609 | 3126 | |
f4f52cb5 CB |
3127 | if (hostgid == sb.st_gid) |
3128 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3129 | chown_mapped_root_exec_wrapper, | |
3130 | (void *)args1); | |
3131 | else | |
3132 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3133 | chown_mapped_root_exec_wrapper, | |
3134 | (void *)args2); | |
3135 | if (ret < 0) | |
3136 | ERROR("lxc-usernsexec failed: %s", cmd_output); | |
7b50c609 | 3137 | |
f4f52cb5 | 3138 | return ret; |
f6d3e3e4 SH |
3139 | } |
3140 | ||
943144d9 CB |
3141 | /* NOTE: Must not be called from inside the container namespace! */ |
3142 | int lxc_create_tmp_proc_mount(struct lxc_conf *conf) | |
5112cd70 SH |
3143 | { |
3144 | int mounted; | |
3145 | ||
943144d9 | 3146 | mounted = lxc_mount_proc_if_needed(conf->rootfs.path ? conf->rootfs.mount : ""); |
5112cd70 | 3147 | if (mounted == -1) { |
0fd73091 | 3148 | SYSERROR("Failed to mount proc in the container"); |
01958b1f | 3149 | /* continue only if there is no rootfs */ |
943144d9 | 3150 | if (conf->rootfs.path) |
01958b1f | 3151 | return -1; |
5112cd70 | 3152 | } else if (mounted == 1) { |
943144d9 | 3153 | conf->tmp_umount_proc = 1; |
5112cd70 | 3154 | } |
943144d9 | 3155 | |
5112cd70 SH |
3156 | return 0; |
3157 | } | |
3158 | ||
3159 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3160 | { | |
0fd73091 CB |
3161 | if (lxc_conf->tmp_umount_proc != 1) |
3162 | return; | |
3163 | ||
3164 | umount("/proc"); | |
3165 | lxc_conf->tmp_umount_proc = 0; | |
5112cd70 SH |
3166 | } |
3167 | ||
0fd73091 | 3168 | /* Walk /proc/mounts and change any shared entries to slave. */ |
6a0c909a | 3169 | void remount_all_slave(void) |
e995d7a2 | 3170 | { |
0fd73091 | 3171 | FILE *f; |
e995d7a2 | 3172 | size_t len = 0; |
0fd73091 | 3173 | char *line = NULL; |
e995d7a2 | 3174 | |
0fd73091 | 3175 | f = fopen("/proc/self/mountinfo", "r"); |
e995d7a2 | 3176 | if (!f) { |
0fd73091 | 3177 | SYSERROR("Failed to open \"/proc/self/mountinfo\" to mark all shared"); |
e995d7a2 SH |
3178 | ERROR("Continuing container startup..."); |
3179 | return; | |
3180 | } | |
3181 | ||
3182 | while (getline(&line, &len, f) != -1) { | |
0fd73091 CB |
3183 | int ret; |
3184 | char *opts, *target; | |
3185 | ||
e995d7a2 SH |
3186 | target = get_field(line, 4); |
3187 | if (!target) | |
3188 | continue; | |
0fd73091 | 3189 | |
e995d7a2 SH |
3190 | opts = get_field(target, 2); |
3191 | if (!opts) | |
3192 | continue; | |
0fd73091 | 3193 | |
e995d7a2 SH |
3194 | null_endofword(opts); |
3195 | if (!strstr(opts, "shared")) | |
3196 | continue; | |
0fd73091 | 3197 | |
e995d7a2 | 3198 | null_endofword(target); |
0fd73091 CB |
3199 | ret = mount(NULL, target, NULL, MS_SLAVE, NULL); |
3200 | if (ret < 0) { | |
3201 | SYSERROR("Failed to make \"%s\" MS_SLAVE", target); | |
e995d7a2 SH |
3202 | ERROR("Continuing..."); |
3203 | } | |
3204 | } | |
3205 | fclose(f); | |
f10fad2f | 3206 | free(line); |
e995d7a2 SH |
3207 | } |
3208 | ||
8353b4c9 | 3209 | static int lxc_execute_bind_init(struct lxc_conf *conf) |
2322903b SH |
3210 | { |
3211 | int ret; | |
9d9c111c SH |
3212 | char path[PATH_MAX], destpath[PATH_MAX], *p; |
3213 | ||
3214 | /* If init exists in the container, don't bind mount a static one */ | |
3215 | p = choose_init(conf->rootfs.mount); | |
3216 | if (p) { | |
3217 | free(p); | |
8353b4c9 | 3218 | return 0; |
9d9c111c | 3219 | } |
2322903b SH |
3220 | |
3221 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
0fd73091 | 3222 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3223 | return -1; |
2322903b SH |
3224 | |
3225 | if (!file_exists(path)) { | |
0fd73091 | 3226 | ERROR("The file \"%s\" does not exist on host", path); |
8353b4c9 | 3227 | return -1; |
2322903b SH |
3228 | } |
3229 | ||
3230 | ret = snprintf(destpath, PATH_MAX, "%s%s", conf->rootfs.mount, "/init.lxc.static"); | |
0fd73091 | 3231 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3232 | return -1; |
2322903b SH |
3233 | |
3234 | if (!file_exists(destpath)) { | |
0fd73091 CB |
3235 | FILE *pathfile; |
3236 | ||
3237 | pathfile = fopen(destpath, "wb"); | |
2322903b | 3238 | if (!pathfile) { |
8353b4c9 CB |
3239 | SYSERROR("Failed to create mount target \"%s\"", destpath); |
3240 | return -1; | |
2322903b | 3241 | } |
8353b4c9 | 3242 | |
2322903b SH |
3243 | fclose(pathfile); |
3244 | } | |
3245 | ||
592fd47a | 3246 | ret = safe_mount(path, destpath, "none", MS_BIND, NULL, conf->rootfs.mount); |
8353b4c9 | 3247 | if (ret < 0) { |
0fd73091 | 3248 | SYSERROR("Failed to bind mount lxc.init.static into container"); |
8353b4c9 CB |
3249 | return -1; |
3250 | } | |
3251 | ||
3252 | INFO("Bind mounted lxc.init.static into container at \"%s\"", path); | |
3253 | return 0; | |
2322903b SH |
3254 | } |
3255 | ||
0fd73091 CB |
3256 | /* This does the work of remounting / if it is shared, calling the container |
3257 | * pre-mount hooks, and mounting the rootfs. | |
35120d9c SH |
3258 | */ |
3259 | int do_rootfs_setup(struct lxc_conf *conf, const char *name, const char *lxcpath) | |
0ad19a3f | 3260 | { |
0fd73091 CB |
3261 | int ret; |
3262 | ||
35120d9c | 3263 | if (conf->rootfs_setup) { |
35120d9c | 3264 | const char *path = conf->rootfs.mount; |
0fd73091 CB |
3265 | |
3266 | /* The rootfs was set up in another namespace. bind-mount it to | |
3267 | * give us a mount in our own ns so we can pivot_root to it | |
3268 | */ | |
3269 | ret = mount(path, path, "rootfs", MS_BIND, NULL); | |
3270 | if (ret < 0) { | |
3271 | ERROR("Failed to bind mount container / onto itself"); | |
145832ba | 3272 | return -1; |
35120d9c | 3273 | } |
0fd73091 CB |
3274 | |
3275 | TRACE("Bind mounted container / onto itself"); | |
145832ba | 3276 | return 0; |
35120d9c | 3277 | } |
d4ef7c50 | 3278 | |
e995d7a2 SH |
3279 | remount_all_slave(); |
3280 | ||
0fd73091 CB |
3281 | ret = run_lxc_hooks(name, "pre-mount", conf, NULL); |
3282 | if (ret < 0) { | |
3283 | ERROR("Failed to run pre-mount hooks"); | |
35120d9c SH |
3284 | return -1; |
3285 | } | |
3286 | ||
0fd73091 CB |
3287 | ret = lxc_setup_rootfs(conf); |
3288 | if (ret < 0) { | |
3289 | ERROR("Failed to setup rootfs for"); | |
35120d9c SH |
3290 | return -1; |
3291 | } | |
3292 | ||
3293 | conf->rootfs_setup = true; | |
3294 | return 0; | |
3295 | } | |
3296 | ||
1c1c7051 SH |
3297 | static bool verify_start_hooks(struct lxc_conf *conf) |
3298 | { | |
1c1c7051 | 3299 | char path[MAXPATHLEN]; |
0fd73091 CB |
3300 | struct lxc_list *it; |
3301 | ||
3302 | lxc_list_for_each (it, &conf->hooks[LXCHOOK_START]) { | |
1c1c7051 | 3303 | int ret; |
0fd73091 CB |
3304 | struct stat st; |
3305 | char *hookname = it->elem; | |
1c1c7051 SH |
3306 | |
3307 | ret = snprintf(path, MAXPATHLEN, "%s%s", | |
0fd73091 CB |
3308 | conf->rootfs.path ? conf->rootfs.mount : "", |
3309 | hookname); | |
1c1c7051 SH |
3310 | if (ret < 0 || ret >= MAXPATHLEN) |
3311 | return false; | |
0fd73091 | 3312 | |
1c1c7051 | 3313 | ret = stat(path, &st); |
0fd73091 | 3314 | if (ret < 0) { |
7b6753e7 | 3315 | SYSERROR("Start hook %s not found in container", |
0fd73091 | 3316 | hookname); |
1c1c7051 SH |
3317 | return false; |
3318 | } | |
0fd73091 | 3319 | |
6a0c909a | 3320 | return true; |
1c1c7051 SH |
3321 | } |
3322 | ||
3323 | return true; | |
3324 | } | |
3325 | ||
3b988b33 | 3326 | int lxc_setup(struct lxc_handler *handler) |
35120d9c | 3327 | { |
2187efd3 | 3328 | int ret; |
0fd73091 | 3329 | const char *lxcpath = handler->lxcpath, *name = handler->name; |
35120d9c | 3330 | struct lxc_conf *lxc_conf = handler->conf; |
35120d9c | 3331 | |
8353b4c9 CB |
3332 | ret = do_rootfs_setup(lxc_conf, name, lxcpath); |
3333 | if (ret < 0) { | |
3334 | ERROR("Failed to setup rootfs"); | |
35120d9c SH |
3335 | return -1; |
3336 | } | |
3337 | ||
28d9e29e | 3338 | if (handler->nsfd[LXC_NS_UTS] == -1) { |
8353b4c9 CB |
3339 | ret = setup_utsname(lxc_conf->utsname); |
3340 | if (ret < 0) { | |
0fd73091 | 3341 | ERROR("Failed to setup the utsname %s", name); |
6c544cb3 MM |
3342 | return -1; |
3343 | } | |
0ad19a3f | 3344 | } |
3345 | ||
8353b4c9 CB |
3346 | ret = lxc_setup_network_in_child_namespaces(lxc_conf, &lxc_conf->network); |
3347 | if (ret < 0) { | |
3348 | ERROR("Failed to setup network"); | |
95b5ffaf | 3349 | return -1; |
0ad19a3f | 3350 | } |
3351 | ||
8353b4c9 CB |
3352 | ret = lxc_network_send_name_and_ifindex_to_parent(handler); |
3353 | if (ret < 0) { | |
3354 | ERROR("Failed to send network device names and ifindices to parent"); | |
790255cf CB |
3355 | return -1; |
3356 | } | |
3357 | ||
bc6928ff | 3358 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3359 | ret = mount_autodev(name, &lxc_conf->rootfs, lxcpath); |
3360 | if (ret < 0) { | |
3361 | ERROR("Failed to mount \"/dev\""); | |
c6883f38 SH |
3362 | return -1; |
3363 | } | |
3364 | } | |
3365 | ||
8353b4c9 CB |
3366 | /* Do automatic mounts (mainly /proc and /sys), but exclude those that |
3367 | * need to wait until other stuff has finished. | |
368bbc02 | 3368 | */ |
8353b4c9 CB |
3369 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler); |
3370 | if (ret < 0) { | |
3371 | ERROR("Failed to setup first automatic mounts"); | |
368bbc02 CS |
3372 | return -1; |
3373 | } | |
3374 | ||
8353b4c9 CB |
3375 | ret = setup_mount(lxc_conf, &lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath); |
3376 | if (ret < 0) { | |
3377 | ERROR("Failed to setup mounts"); | |
95b5ffaf | 3378 | return -1; |
576f946d | 3379 | } |
3380 | ||
7b6753e7 | 3381 | /* Make sure any start hooks are in the container */ |
1c1c7051 SH |
3382 | if (!verify_start_hooks(lxc_conf)) |
3383 | return -1; | |
3384 | ||
8353b4c9 CB |
3385 | if (lxc_conf->is_execute) { |
3386 | ret = lxc_execute_bind_init(lxc_conf); | |
3387 | if (ret < 0) { | |
3388 | ERROR("Failed to bind-mount the lxc init system"); | |
3389 | return -1; | |
3390 | } | |
3391 | } | |
2322903b | 3392 | |
8353b4c9 CB |
3393 | /* Now mount only cgroups, if wanted. Before, /sys could not have been |
3394 | * mounted. It is guaranteed to be mounted now either through | |
3395 | * automatically or via fstab entries. | |
368bbc02 | 3396 | */ |
8353b4c9 CB |
3397 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler); |
3398 | if (ret < 0) { | |
3399 | ERROR("Failed to setup remaining automatic mounts"); | |
368bbc02 CS |
3400 | return -1; |
3401 | } | |
3402 | ||
8353b4c9 | 3403 | ret = run_lxc_hooks(name, "mount", lxc_conf, NULL); |
1a2cf89d | 3404 | if (ret < 0) { |
8353b4c9 | 3405 | ERROR("Failed to run mount hooks"); |
773fb9ca SH |
3406 | return -1; |
3407 | } | |
3408 | ||
bc6928ff | 3409 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3410 | ret = run_lxc_hooks(name, "autodev", lxc_conf, NULL); |
3411 | if (ret < 0) { | |
3412 | ERROR("Failed to run autodev hooks"); | |
f7bee6c6 MW |
3413 | return -1; |
3414 | } | |
06749971 | 3415 | |
8353b4c9 CB |
3416 | ret = lxc_fill_autodev(&lxc_conf->rootfs); |
3417 | if (ret < 0) { | |
3418 | ERROR("Failed to populate \"/dev\""); | |
91c3830e SH |
3419 | return -1; |
3420 | } | |
3421 | } | |
368bbc02 | 3422 | |
8353b4c9 CB |
3423 | if (!lxc_list_empty(&lxc_conf->mount_list)) { |
3424 | ret = setup_mount_entries(lxc_conf, &lxc_conf->rootfs, | |
3425 | &lxc_conf->mount_list, name, lxcpath); | |
3426 | if (ret < 0) { | |
3427 | ERROR("Failed to setup mount entries"); | |
3428 | return -1; | |
3429 | } | |
181437fd YT |
3430 | } |
3431 | ||
ed8704d0 CB |
3432 | ret = lxc_setup_console(&lxc_conf->rootfs, &lxc_conf->console, |
3433 | lxc_conf->ttydir); | |
3434 | if (ret < 0) { | |
3435 | ERROR("Failed to setup console"); | |
95b5ffaf | 3436 | return -1; |
6e590161 | 3437 | } |
3438 | ||
ed8704d0 CB |
3439 | ret = lxc_setup_dev_symlinks(&lxc_conf->rootfs); |
3440 | if (ret < 0) { | |
8353b4c9 | 3441 | ERROR("Failed to setup \"/dev\" symlinks"); |
69aa6655 DE |
3442 | return -1; |
3443 | } | |
3444 | ||
8353b4c9 CB |
3445 | ret = lxc_create_tmp_proc_mount(lxc_conf); |
3446 | if (ret < 0) { | |
3447 | ERROR("Failed to \"/proc\" LSMs"); | |
e075f5d9 | 3448 | return -1; |
e075f5d9 | 3449 | } |
e075f5d9 | 3450 | |
8353b4c9 CB |
3451 | ret = setup_pivot_root(&lxc_conf->rootfs); |
3452 | if (ret < 0) { | |
3453 | ERROR("Failed to pivot root into rootfs"); | |
95b5ffaf | 3454 | return -1; |
ed502555 | 3455 | } |
3456 | ||
8353b4c9 CB |
3457 | ret = lxc_setup_devpts(lxc_conf); |
3458 | if (ret < 0) { | |
3459 | ERROR("Failed to setup new devpts instance"); | |
95b5ffaf | 3460 | return -1; |
3c26f34e | 3461 | } |
3462 | ||
2187efd3 CB |
3463 | ret = lxc_create_ttys(handler); |
3464 | if (ret < 0) | |
e8bd4e43 | 3465 | return -1; |
e8bd4e43 | 3466 | |
8353b4c9 CB |
3467 | ret = setup_personality(lxc_conf->personality); |
3468 | if (ret < 0) { | |
3469 | ERROR("Failed to set personality"); | |
cccc74b5 DL |
3470 | return -1; |
3471 | } | |
3472 | ||
8353b4c9 CB |
3473 | /* Set sysctl value to a path under /proc/sys as determined from the |
3474 | * key. For e.g. net.ipv4.ip_forward translated to | |
3475 | * /proc/sys/net/ipv4/ip_forward. | |
7edd0540 L |
3476 | */ |
3477 | if (!lxc_list_empty(&lxc_conf->sysctls)) { | |
3478 | ret = setup_sysctl_parameters(&lxc_conf->sysctls); | |
8353b4c9 CB |
3479 | if (ret < 0) { |
3480 | ERROR("Failed to setup sysctl parameters"); | |
7edd0540 | 3481 | return -1; |
8353b4c9 | 3482 | } |
7edd0540 L |
3483 | } |
3484 | ||
97a8f74f SG |
3485 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
3486 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
8353b4c9 CB |
3487 | ERROR("Container requests lxc.cap.drop and " |
3488 | "lxc.cap.keep: either use lxc.cap.drop or " | |
3489 | "lxc.cap.keep, not both"); | |
f6d3e3e4 SH |
3490 | return -1; |
3491 | } | |
8353b4c9 | 3492 | |
97a8f74f | 3493 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
8353b4c9 | 3494 | ERROR("Failed to keep capabilities"); |
97a8f74f SG |
3495 | return -1; |
3496 | } | |
3497 | } else if (setup_caps(&lxc_conf->caps)) { | |
8353b4c9 | 3498 | ERROR("Failed to drop capabilities"); |
97a8f74f | 3499 | return -1; |
81810dd1 DL |
3500 | } |
3501 | ||
8353b4c9 | 3502 | NOTICE("The container \"%s\" is set up", name); |
cd54d859 | 3503 | |
0ad19a3f | 3504 | return 0; |
3505 | } | |
26ddeedd | 3506 | |
3f60c2f7 | 3507 | int run_lxc_hooks(const char *name, char *hookname, struct lxc_conf *conf, |
14a7b0f9 | 3508 | char *argv[]) |
26ddeedd | 3509 | { |
26ddeedd | 3510 | struct lxc_list *it; |
3f60c2f7 | 3511 | int which = -1; |
26ddeedd | 3512 | |
3f60c2f7 | 3513 | if (strcmp(hookname, "pre-start") == 0) |
26ddeedd | 3514 | which = LXCHOOK_PRESTART; |
3f60c2f7 | 3515 | else if (strcmp(hookname, "start-host") == 0) |
08dd2805 | 3516 | which = LXCHOOK_START_HOST; |
3f60c2f7 | 3517 | else if (strcmp(hookname, "pre-mount") == 0) |
5ea6163a | 3518 | which = LXCHOOK_PREMOUNT; |
3f60c2f7 | 3519 | else if (strcmp(hookname, "mount") == 0) |
26ddeedd | 3520 | which = LXCHOOK_MOUNT; |
3f60c2f7 | 3521 | else if (strcmp(hookname, "autodev") == 0) |
f7bee6c6 | 3522 | which = LXCHOOK_AUTODEV; |
3f60c2f7 | 3523 | else if (strcmp(hookname, "start") == 0) |
26ddeedd | 3524 | which = LXCHOOK_START; |
3f60c2f7 | 3525 | else if (strcmp(hookname, "stop") == 0) |
52492063 | 3526 | which = LXCHOOK_STOP; |
3f60c2f7 | 3527 | else if (strcmp(hookname, "post-stop") == 0) |
26ddeedd | 3528 | which = LXCHOOK_POSTSTOP; |
3f60c2f7 | 3529 | else if (strcmp(hookname, "clone") == 0) |
148e91f5 | 3530 | which = LXCHOOK_CLONE; |
3f60c2f7 | 3531 | else if (strcmp(hookname, "destroy") == 0) |
37cf711b | 3532 | which = LXCHOOK_DESTROY; |
26ddeedd SH |
3533 | else |
3534 | return -1; | |
3f60c2f7 | 3535 | |
0fd73091 | 3536 | lxc_list_for_each (it, &conf->hooks[which]) { |
26ddeedd | 3537 | int ret; |
3f60c2f7 CB |
3538 | char *hook = it->elem; |
3539 | ||
3540 | ret = run_script_argv(name, conf->hooks_version, "lxc", hook, | |
14a7b0f9 | 3541 | hookname, argv); |
3f60c2f7 CB |
3542 | if (ret < 0) |
3543 | return -1; | |
26ddeedd | 3544 | } |
3f60c2f7 | 3545 | |
26ddeedd SH |
3546 | return 0; |
3547 | } | |
72d0e1cb | 3548 | |
72d0e1cb SG |
3549 | int lxc_clear_config_caps(struct lxc_conf *c) |
3550 | { | |
1a0e70ac | 3551 | struct lxc_list *it, *next; |
72d0e1cb | 3552 | |
0fd73091 | 3553 | lxc_list_for_each_safe (it, &c->caps, next) { |
72d0e1cb SG |
3554 | lxc_list_del(it); |
3555 | free(it->elem); | |
3556 | free(it); | |
3557 | } | |
0fd73091 | 3558 | |
72d0e1cb SG |
3559 | return 0; |
3560 | } | |
3561 | ||
c7e345ae CB |
3562 | static int lxc_free_idmap(struct lxc_list *id_map) |
3563 | { | |
27c27d73 SH |
3564 | struct lxc_list *it, *next; |
3565 | ||
0fd73091 | 3566 | lxc_list_for_each_safe (it, id_map, next) { |
27c27d73 SH |
3567 | lxc_list_del(it); |
3568 | free(it->elem); | |
3569 | free(it); | |
3570 | } | |
c7e345ae | 3571 | |
27c27d73 SH |
3572 | return 0; |
3573 | } | |
3574 | ||
4355ab5f SH |
3575 | int lxc_clear_idmaps(struct lxc_conf *c) |
3576 | { | |
3577 | return lxc_free_idmap(&c->id_map); | |
3578 | } | |
3579 | ||
1fb86a7c SH |
3580 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
3581 | { | |
0fd73091 | 3582 | struct lxc_list *it, *next; |
1fb86a7c | 3583 | |
0fd73091 | 3584 | lxc_list_for_each_safe (it, &c->keepcaps, next) { |
1fb86a7c SH |
3585 | lxc_list_del(it); |
3586 | free(it->elem); | |
3587 | free(it); | |
3588 | } | |
0fd73091 | 3589 | |
1fb86a7c SH |
3590 | return 0; |
3591 | } | |
3592 | ||
54860ed0 | 3593 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version) |
72d0e1cb | 3594 | { |
54860ed0 | 3595 | char *global_token, *namespaced_token; |
ab1a6cac | 3596 | size_t namespaced_token_len; |
54860ed0 | 3597 | struct lxc_list *it, *next, *list; |
ab1a6cac | 3598 | const char *k = key; |
54860ed0 | 3599 | bool all = false; |
72d0e1cb | 3600 | |
54860ed0 CB |
3601 | if (version == CGROUP2_SUPER_MAGIC) { |
3602 | global_token = "lxc.cgroup2"; | |
3603 | namespaced_token = "lxc.cgroup2."; | |
0fd73091 | 3604 | namespaced_token_len = sizeof("lxc.cgroup2.") - 1; |
54860ed0 CB |
3605 | list = &c->cgroup2; |
3606 | } else if (version == CGROUP_SUPER_MAGIC) { | |
3607 | global_token = "lxc.cgroup"; | |
3608 | namespaced_token = "lxc.cgroup."; | |
0fd73091 | 3609 | namespaced_token_len = sizeof("lxc.cgroup.") - 1; |
54860ed0 CB |
3610 | list = &c->cgroup; |
3611 | } else { | |
ab1a6cac | 3612 | return -EINVAL; |
54860ed0 CB |
3613 | } |
3614 | ||
3615 | if (strcmp(key, global_token) == 0) | |
72d0e1cb | 3616 | all = true; |
54860ed0 | 3617 | else if (strncmp(key, namespaced_token, sizeof(namespaced_token) - 1) == 0) |
ab1a6cac | 3618 | k += namespaced_token_len; |
a6390f01 | 3619 | else |
ab1a6cac | 3620 | return -EINVAL; |
72d0e1cb | 3621 | |
0fd73091 | 3622 | lxc_list_for_each_safe (it, list, next) { |
72d0e1cb | 3623 | struct lxc_cgroup *cg = it->elem; |
54860ed0 | 3624 | |
72d0e1cb SG |
3625 | if (!all && strcmp(cg->subsystem, k) != 0) |
3626 | continue; | |
54860ed0 | 3627 | |
72d0e1cb SG |
3628 | lxc_list_del(it); |
3629 | free(cg->subsystem); | |
3630 | free(cg->value); | |
3631 | free(cg); | |
3632 | free(it); | |
3633 | } | |
e409b214 | 3634 | |
72d0e1cb SG |
3635 | return 0; |
3636 | } | |
3637 | ||
c6d09e15 WB |
3638 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
3639 | { | |
3640 | struct lxc_list *it, *next; | |
c6d09e15 | 3641 | const char *k = NULL; |
0fd73091 | 3642 | bool all = false; |
c6d09e15 | 3643 | |
b668653c | 3644 | if (strcmp(key, "lxc.limit") == 0 || strcmp(key, "lxc.prlimit") == 0) |
c6d09e15 | 3645 | all = true; |
b668653c CB |
3646 | else if (strncmp(key, "lxc.limit.", sizeof("lxc.limit.") - 1) == 0) |
3647 | k = key + sizeof("lxc.limit.") - 1; | |
3648 | else if (strncmp(key, "lxc.prlimit.", sizeof("lxc.prlimit.") - 1) == 0) | |
3649 | k = key + sizeof("lxc.prlimit.") - 1; | |
c6d09e15 WB |
3650 | else |
3651 | return -1; | |
3652 | ||
0fd73091 | 3653 | lxc_list_for_each_safe (it, &c->limits, next) { |
c6d09e15 | 3654 | struct lxc_limit *lim = it->elem; |
0fd73091 | 3655 | |
c6d09e15 WB |
3656 | if (!all && strcmp(lim->resource, k) != 0) |
3657 | continue; | |
0fd73091 | 3658 | |
c6d09e15 WB |
3659 | lxc_list_del(it); |
3660 | free(lim->resource); | |
3661 | free(lim); | |
3662 | free(it); | |
3663 | } | |
b668653c | 3664 | |
c6d09e15 WB |
3665 | return 0; |
3666 | } | |
3667 | ||
7edd0540 L |
3668 | int lxc_clear_sysctls(struct lxc_conf *c, const char *key) |
3669 | { | |
3670 | struct lxc_list *it, *next; | |
7edd0540 | 3671 | const char *k = NULL; |
0fd73091 | 3672 | bool all = false; |
7edd0540 L |
3673 | |
3674 | if (strcmp(key, "lxc.sysctl") == 0) | |
3675 | all = true; | |
3676 | else if (strncmp(key, "lxc.sysctl.", sizeof("lxc.sysctl.") - 1) == 0) | |
3677 | k = key + sizeof("lxc.sysctl.") - 1; | |
3678 | else | |
3679 | return -1; | |
3680 | ||
0fd73091 | 3681 | lxc_list_for_each_safe (it, &c->sysctls, next) { |
7edd0540 | 3682 | struct lxc_sysctl *elem = it->elem; |
0fd73091 | 3683 | |
7edd0540 L |
3684 | if (!all && strcmp(elem->key, k) != 0) |
3685 | continue; | |
0fd73091 | 3686 | |
7edd0540 L |
3687 | lxc_list_del(it); |
3688 | free(elem->key); | |
3689 | free(elem->value); | |
3690 | free(elem); | |
3691 | free(it); | |
3692 | } | |
0fd73091 | 3693 | |
7edd0540 L |
3694 | return 0; |
3695 | } | |
3696 | ||
61d7a733 YT |
3697 | int lxc_clear_procs(struct lxc_conf *c, const char *key) |
3698 | { | |
0fd73091 | 3699 | struct lxc_list *it, *next; |
61d7a733 | 3700 | const char *k = NULL; |
0fd73091 | 3701 | bool all = false; |
61d7a733 YT |
3702 | |
3703 | if (strcmp(key, "lxc.proc") == 0) | |
3704 | all = true; | |
3705 | else if (strncmp(key, "lxc.proc.", sizeof("lxc.proc.") - 1) == 0) | |
3706 | k = key + sizeof("lxc.proc.") - 1; | |
3707 | else | |
3708 | return -1; | |
3709 | ||
0fd73091 | 3710 | lxc_list_for_each_safe (it, &c->procs, next) { |
61d7a733 | 3711 | struct lxc_proc *proc = it->elem; |
0fd73091 | 3712 | |
61d7a733 YT |
3713 | if (!all && strcmp(proc->filename, k) != 0) |
3714 | continue; | |
0fd73091 | 3715 | |
61d7a733 YT |
3716 | lxc_list_del(it); |
3717 | free(proc->filename); | |
3718 | free(proc->value); | |
3719 | free(proc); | |
3720 | free(it); | |
3721 | } | |
3722 | ||
3723 | return 0; | |
3724 | } | |
3725 | ||
ee1e7aa0 SG |
3726 | int lxc_clear_groups(struct lxc_conf *c) |
3727 | { | |
0fd73091 | 3728 | struct lxc_list *it, *next; |
ee1e7aa0 | 3729 | |
0fd73091 | 3730 | lxc_list_for_each_safe (it, &c->groups, next) { |
ee1e7aa0 SG |
3731 | lxc_list_del(it); |
3732 | free(it->elem); | |
3733 | free(it); | |
3734 | } | |
0fd73091 | 3735 | |
ee1e7aa0 SG |
3736 | return 0; |
3737 | } | |
3738 | ||
ab799c0b SG |
3739 | int lxc_clear_environment(struct lxc_conf *c) |
3740 | { | |
0fd73091 | 3741 | struct lxc_list *it, *next; |
ab799c0b | 3742 | |
0fd73091 | 3743 | lxc_list_for_each_safe (it, &c->environment, next) { |
ab799c0b SG |
3744 | lxc_list_del(it); |
3745 | free(it->elem); | |
3746 | free(it); | |
3747 | } | |
0fd73091 | 3748 | |
ab799c0b SG |
3749 | return 0; |
3750 | } | |
3751 | ||
72d0e1cb SG |
3752 | int lxc_clear_mount_entries(struct lxc_conf *c) |
3753 | { | |
0fd73091 | 3754 | struct lxc_list *it, *next; |
72d0e1cb | 3755 | |
0fd73091 | 3756 | lxc_list_for_each_safe (it, &c->mount_list, next) { |
72d0e1cb SG |
3757 | lxc_list_del(it); |
3758 | free(it->elem); | |
3759 | free(it); | |
3760 | } | |
0fd73091 | 3761 | |
72d0e1cb SG |
3762 | return 0; |
3763 | } | |
3764 | ||
b099e9e9 SH |
3765 | int lxc_clear_automounts(struct lxc_conf *c) |
3766 | { | |
3767 | c->auto_mounts = 0; | |
3768 | return 0; | |
3769 | } | |
3770 | ||
12a50cc6 | 3771 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 3772 | { |
72d0e1cb | 3773 | int i; |
0fd73091 CB |
3774 | struct lxc_list *it, *next; |
3775 | const char *k = NULL; | |
3776 | bool all = false, done = false; | |
72d0e1cb | 3777 | |
17ed13a3 SH |
3778 | if (strcmp(key, "lxc.hook") == 0) |
3779 | all = true; | |
0fd73091 CB |
3780 | else if (strncmp(key, "lxc.hook.", sizeof("lxc.hook.") - 1) == 0) |
3781 | k = key + sizeof("lxc.hook.") - 1; | |
a6390f01 WB |
3782 | else |
3783 | return -1; | |
17ed13a3 | 3784 | |
0fd73091 | 3785 | for (i = 0; i < NUM_LXC_HOOKS; i++) { |
17ed13a3 | 3786 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
0fd73091 | 3787 | lxc_list_for_each_safe (it, &c->hooks[i], next) { |
17ed13a3 SH |
3788 | lxc_list_del(it); |
3789 | free(it->elem); | |
3790 | free(it); | |
3791 | } | |
0fd73091 | 3792 | |
17ed13a3 | 3793 | done = true; |
72d0e1cb SG |
3794 | } |
3795 | } | |
17ed13a3 SH |
3796 | |
3797 | if (!done) { | |
3798 | ERROR("Invalid hook key: %s", key); | |
3799 | return -1; | |
3800 | } | |
0fd73091 | 3801 | |
72d0e1cb SG |
3802 | return 0; |
3803 | } | |
8eb5694b | 3804 | |
4184c3e1 SH |
3805 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
3806 | { | |
0fd73091 | 3807 | struct lxc_list *it, *next; |
4184c3e1 | 3808 | |
0fd73091 | 3809 | lxc_list_for_each_safe (it, &conf->aliens, next) { |
4184c3e1 SH |
3810 | lxc_list_del(it); |
3811 | free(it->elem); | |
3812 | free(it); | |
3813 | } | |
3814 | } | |
3815 | ||
c7b15d1e | 3816 | void lxc_clear_includes(struct lxc_conf *conf) |
f979ac15 | 3817 | { |
0fd73091 | 3818 | struct lxc_list *it, *next; |
f979ac15 | 3819 | |
0fd73091 | 3820 | lxc_list_for_each_safe (it, &conf->includes, next) { |
f979ac15 SH |
3821 | lxc_list_del(it); |
3822 | free(it->elem); | |
3823 | free(it); | |
3824 | } | |
3825 | } | |
3826 | ||
8eb5694b SH |
3827 | void lxc_conf_free(struct lxc_conf *conf) |
3828 | { | |
3829 | if (!conf) | |
3830 | return; | |
0fd73091 | 3831 | |
858377e4 SH |
3832 | if (current_config == conf) |
3833 | current_config = NULL; | |
aed105d5 | 3834 | lxc_terminal_conf_free(&conf->console); |
f10fad2f | 3835 | free(conf->rootfs.mount); |
b3b8c97f | 3836 | free(conf->rootfs.bdev_type); |
f10fad2f ME |
3837 | free(conf->rootfs.options); |
3838 | free(conf->rootfs.path); | |
f10fad2f | 3839 | free(conf->logfile); |
858377e4 SH |
3840 | if (conf->logfd != -1) |
3841 | close(conf->logfd); | |
f10fad2f ME |
3842 | free(conf->utsname); |
3843 | free(conf->ttydir); | |
3844 | free(conf->fstab); | |
3845 | free(conf->rcfile); | |
5cda27c1 | 3846 | free(conf->execute_cmd); |
f10fad2f | 3847 | free(conf->init_cmd); |
3c491553 | 3848 | free(conf->init_cwd); |
6b0d5538 | 3849 | free(conf->unexpanded_config); |
393903d1 | 3850 | free(conf->pty_names); |
76d0127f | 3851 | free(conf->syslog); |
c302b476 | 3852 | lxc_free_networks(&conf->network); |
f10fad2f ME |
3853 | free(conf->lsm_aa_profile); |
3854 | free(conf->lsm_se_context); | |
769872f9 | 3855 | lxc_seccomp_free(conf); |
8eb5694b | 3856 | lxc_clear_config_caps(conf); |
1fb86a7c | 3857 | lxc_clear_config_keepcaps(conf); |
54860ed0 CB |
3858 | lxc_clear_cgroups(conf, "lxc.cgroup", CGROUP_SUPER_MAGIC); |
3859 | lxc_clear_cgroups(conf, "lxc.cgroup2", CGROUP2_SUPER_MAGIC); | |
17ed13a3 | 3860 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 3861 | lxc_clear_mount_entries(conf); |
27c27d73 | 3862 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 3863 | lxc_clear_groups(conf); |
f979ac15 | 3864 | lxc_clear_includes(conf); |
761d81ca | 3865 | lxc_clear_aliens(conf); |
ab799c0b | 3866 | lxc_clear_environment(conf); |
240d4b74 | 3867 | lxc_clear_limits(conf, "lxc.prlimit"); |
7edd0540 | 3868 | lxc_clear_sysctls(conf, "lxc.sysctl"); |
61d7a733 | 3869 | lxc_clear_procs(conf, "lxc.proc"); |
43654d34 CB |
3870 | free(conf->cgroup_meta.dir); |
3871 | free(conf->cgroup_meta.controllers); | |
8eb5694b SH |
3872 | free(conf); |
3873 | } | |
4355ab5f SH |
3874 | |
3875 | struct userns_fn_data { | |
3876 | int (*fn)(void *); | |
c9b7c33e | 3877 | const char *fn_name; |
4355ab5f SH |
3878 | void *arg; |
3879 | int p[2]; | |
3880 | }; | |
3881 | ||
3882 | static int run_userns_fn(void *data) | |
3883 | { | |
4355ab5f | 3884 | char c; |
0fd73091 | 3885 | struct userns_fn_data *d = data; |
4355ab5f | 3886 | |
f8aa4bf3 | 3887 | /* Close write end of the pipe. */ |
4355ab5f | 3888 | close(d->p[1]); |
f8aa4bf3 CB |
3889 | |
3890 | /* Wait for parent to finish establishing a new mapping in the user | |
3891 | * namespace we are executing in. | |
3892 | */ | |
4355ab5f SH |
3893 | if (read(d->p[0], &c, 1) != 1) |
3894 | return -1; | |
f8aa4bf3 CB |
3895 | |
3896 | /* Close read end of the pipe. */ | |
4355ab5f | 3897 | close(d->p[0]); |
f8aa4bf3 | 3898 | |
c9b7c33e CB |
3899 | if (d->fn_name) |
3900 | TRACE("calling function \"%s\"", d->fn_name); | |
0fd73091 | 3901 | |
f8aa4bf3 | 3902 | /* Call function to run. */ |
4355ab5f SH |
3903 | return d->fn(d->arg); |
3904 | } | |
3905 | ||
db7cfe23 CB |
3906 | static struct id_map *mapped_nsid_add(struct lxc_conf *conf, unsigned id, |
3907 | enum idtype idtype) | |
3908 | { | |
3909 | struct id_map *map, *retmap; | |
3910 | ||
3911 | map = find_mapped_nsid_entry(conf, id, idtype); | |
3912 | if (!map) | |
3913 | return NULL; | |
3914 | ||
3915 | retmap = malloc(sizeof(*retmap)); | |
3916 | if (!retmap) | |
3917 | return NULL; | |
3918 | ||
3919 | memcpy(retmap, map, sizeof(*retmap)); | |
3920 | return retmap; | |
3921 | } | |
3922 | ||
c4333195 CB |
3923 | static struct id_map *find_mapped_hostid_entry(struct lxc_conf *conf, |
3924 | unsigned id, enum idtype idtype) | |
f8aa4bf3 | 3925 | { |
f8aa4bf3 | 3926 | struct id_map *map; |
0fd73091 | 3927 | struct lxc_list *it; |
f8aa4bf3 CB |
3928 | struct id_map *retmap = NULL; |
3929 | ||
0fd73091 | 3930 | lxc_list_for_each (it, &conf->id_map) { |
f8aa4bf3 CB |
3931 | map = it->elem; |
3932 | if (map->idtype != idtype) | |
3933 | continue; | |
3934 | ||
3935 | if (id >= map->hostid && id < map->hostid + map->range) { | |
3936 | retmap = map; | |
3937 | break; | |
3938 | } | |
3939 | } | |
3940 | ||
f8aa4bf3 CB |
3941 | return retmap; |
3942 | } | |
3943 | ||
0fd73091 | 3944 | /* Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
f8aa4bf3 | 3945 | * existing one or establish a new one. |
4355ab5f | 3946 | */ |
0fd73091 CB |
3947 | static struct id_map *mapped_hostid_add(struct lxc_conf *conf, uid_t id, |
3948 | enum idtype type) | |
4355ab5f | 3949 | { |
28a2d9e7 | 3950 | int hostid_mapped; |
c4333195 CB |
3951 | struct id_map *entry = NULL, *tmp = NULL; |
3952 | ||
3953 | entry = malloc(sizeof(*entry)); | |
3954 | if (!entry) | |
3955 | return NULL; | |
f8aa4bf3 | 3956 | |
28a2d9e7 | 3957 | /* Reuse existing mapping. */ |
c4333195 CB |
3958 | tmp = find_mapped_hostid_entry(conf, id, type); |
3959 | if (tmp) | |
3960 | return memcpy(entry, tmp, sizeof(*entry)); | |
f8aa4bf3 | 3961 | |
28a2d9e7 CB |
3962 | /* Find new mapping. */ |
3963 | hostid_mapped = find_unmapped_nsid(conf, type); | |
3964 | if (hostid_mapped < 0) { | |
c4333195 CB |
3965 | DEBUG("Failed to find free mapping for id %d", id); |
3966 | free(entry); | |
28a2d9e7 | 3967 | return NULL; |
f8aa4bf3 | 3968 | } |
f8aa4bf3 | 3969 | |
28a2d9e7 CB |
3970 | entry->idtype = type; |
3971 | entry->nsid = hostid_mapped; | |
3972 | entry->hostid = (unsigned long)id; | |
3973 | entry->range = 1; | |
4355ab5f | 3974 | |
28a2d9e7 | 3975 | return entry; |
4355ab5f SH |
3976 | } |
3977 | ||
dcf0ffdf | 3978 | struct lxc_list *get_minimal_idmap(struct lxc_conf *conf) |
4355ab5f | 3979 | { |
f8aa4bf3 | 3980 | uid_t euid, egid; |
4160c3a0 CB |
3981 | uid_t nsuid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; |
3982 | gid_t nsgid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
f8aa4bf3 | 3983 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
28a2d9e7 CB |
3984 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, |
3985 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4355ab5f | 3986 | |
db7cfe23 | 3987 | /* Find container root mappings. */ |
4160c3a0 | 3988 | container_root_uid = mapped_nsid_add(conf, nsuid, ID_TYPE_UID); |
db7cfe23 | 3989 | if (!container_root_uid) { |
dcf0ffdf | 3990 | DEBUG("Failed to find mapping for namespace uid %d", 0); |
db7cfe23 | 3991 | goto on_error; |
f8aa4bf3 | 3992 | } |
dcf0ffdf CB |
3993 | euid = geteuid(); |
3994 | if (euid >= container_root_uid->hostid && | |
3995 | euid < (container_root_uid->hostid + container_root_uid->range)) | |
db7cfe23 | 3996 | host_uid_map = container_root_uid; |
f8aa4bf3 | 3997 | |
4160c3a0 | 3998 | container_root_gid = mapped_nsid_add(conf, nsgid, ID_TYPE_GID); |
db7cfe23 | 3999 | if (!container_root_gid) { |
dcf0ffdf | 4000 | DEBUG("Failed to find mapping for namespace gid %d", 0); |
f8aa4bf3 CB |
4001 | goto on_error; |
4002 | } | |
dcf0ffdf CB |
4003 | egid = getegid(); |
4004 | if (egid >= container_root_gid->hostid && | |
4005 | egid < (container_root_gid->hostid + container_root_gid->range)) | |
db7cfe23 | 4006 | host_gid_map = container_root_gid; |
f8aa4bf3 CB |
4007 | |
4008 | /* Check whether the {g,u}id of the user has a mapping. */ | |
954b7d9b | 4009 | if (!host_uid_map) |
c4333195 | 4010 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
28a2d9e7 | 4011 | if (!host_uid_map) { |
db7cfe23 | 4012 | DEBUG("Failed to find mapping for uid %d", euid); |
f8aa4bf3 CB |
4013 | goto on_error; |
4014 | } | |
4015 | ||
dcf0ffdf CB |
4016 | if (!host_gid_map) |
4017 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); | |
28a2d9e7 | 4018 | if (!host_gid_map) { |
db7cfe23 | 4019 | DEBUG("Failed to find mapping for gid %d", egid); |
28a2d9e7 CB |
4020 | goto on_error; |
4021 | } | |
4022 | ||
4023 | /* Allocate new {g,u}id map list. */ | |
4024 | idmap = malloc(sizeof(*idmap)); | |
4025 | if (!idmap) | |
4026 | goto on_error; | |
4027 | lxc_list_init(idmap); | |
4028 | ||
f8aa4bf3 CB |
4029 | /* Add container root to the map. */ |
4030 | tmplist = malloc(sizeof(*tmplist)); | |
4031 | if (!tmplist) | |
4032 | goto on_error; | |
4033 | lxc_list_add_elem(tmplist, container_root_uid); | |
4034 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4035 | |
1d90e064 | 4036 | if (host_uid_map && (host_uid_map != container_root_uid)) { |
28a2d9e7 CB |
4037 | /* idmap will now keep track of that memory. */ |
4038 | container_root_uid = NULL; | |
4039 | ||
4040 | /* Add container root to the map. */ | |
4041 | tmplist = malloc(sizeof(*tmplist)); | |
4042 | if (!tmplist) | |
4043 | goto on_error; | |
4044 | lxc_list_add_elem(tmplist, host_uid_map); | |
4045 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4046 | } |
1d90e064 CB |
4047 | /* idmap will now keep track of that memory. */ |
4048 | container_root_uid = NULL; | |
4049 | /* idmap will now keep track of that memory. */ | |
4050 | host_uid_map = NULL; | |
f8aa4bf3 CB |
4051 | |
4052 | tmplist = malloc(sizeof(*tmplist)); | |
4053 | if (!tmplist) | |
4054 | goto on_error; | |
4055 | lxc_list_add_elem(tmplist, container_root_gid); | |
4056 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4057 | |
1d90e064 | 4058 | if (host_gid_map && (host_gid_map != container_root_gid)) { |
28a2d9e7 CB |
4059 | /* idmap will now keep track of that memory. */ |
4060 | container_root_gid = NULL; | |
4061 | ||
4062 | tmplist = malloc(sizeof(*tmplist)); | |
4063 | if (!tmplist) | |
4064 | goto on_error; | |
4065 | lxc_list_add_elem(tmplist, host_gid_map); | |
4066 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4067 | } |
1d90e064 CB |
4068 | /* idmap will now keep track of that memory. */ |
4069 | container_root_gid = NULL; | |
4070 | /* idmap will now keep track of that memory. */ | |
4071 | host_gid_map = NULL; | |
f8aa4bf3 | 4072 | |
dcf0ffdf CB |
4073 | TRACE("Allocated minimal idmapping"); |
4074 | return idmap; | |
4075 | ||
4076 | on_error: | |
4077 | if (idmap) | |
4078 | lxc_free_idmap(idmap); | |
4079 | if (container_root_uid) | |
4080 | free(container_root_uid); | |
4081 | if (container_root_gid) | |
4082 | free(container_root_gid); | |
4083 | if (host_uid_map && (host_uid_map != container_root_uid)) | |
4084 | free(host_uid_map); | |
4085 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4086 | free(host_gid_map); | |
4087 | ||
4088 | return NULL; | |
4089 | } | |
4090 | ||
4091 | /* Run a function in a new user namespace. | |
4092 | * The caller's euid/egid will be mapped if it is not already. | |
4093 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
4094 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
4095 | * This means we require only to establish a mapping from: | |
4096 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
4097 | * - the container root -> some sub{g,u}id | |
4098 | * The former we add, if the user did not specifiy a mapping. The latter we | |
4099 | * retrieve from the ontainer's configured {g,u}id mappings as it must have been | |
4100 | * there to start the container in the first place. | |
4101 | */ | |
4102 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data, | |
4103 | const char *fn_name) | |
4104 | { | |
4105 | pid_t pid; | |
dcf0ffdf | 4106 | int p[2]; |
0fd73091 | 4107 | struct userns_fn_data d; |
dcf0ffdf | 4108 | struct lxc_list *idmap; |
0fd73091 CB |
4109 | int ret = -1, status = -1; |
4110 | char c = '1'; | |
dcf0ffdf CB |
4111 | |
4112 | idmap = get_minimal_idmap(conf); | |
4113 | if (!idmap) | |
4114 | return -1; | |
4115 | ||
4116 | ret = pipe(p); | |
4117 | if (ret < 0) { | |
4118 | SYSERROR("Failed to create pipe"); | |
4119 | return -1; | |
4120 | } | |
4121 | d.fn = fn; | |
4122 | d.fn_name = fn_name; | |
4123 | d.arg = data; | |
4124 | d.p[0] = p[0]; | |
4125 | d.p[1] = p[1]; | |
4126 | ||
4127 | /* Clone child in new user namespace. */ | |
4128 | pid = lxc_raw_clone_cb(run_userns_fn, &d, CLONE_NEWUSER); | |
4129 | if (pid < 0) { | |
0fd73091 | 4130 | ERROR("Failed to clone process in new user namespace"); |
dcf0ffdf CB |
4131 | goto on_error; |
4132 | } | |
4133 | ||
4134 | close(p[0]); | |
4135 | p[0] = -1; | |
4136 | ||
4b73005c CB |
4137 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || |
4138 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
dcf0ffdf | 4139 | struct id_map *map; |
0fd73091 | 4140 | struct lxc_list *it; |
dcf0ffdf | 4141 | |
0fd73091 | 4142 | lxc_list_for_each (it, idmap) { |
f8aa4bf3 | 4143 | map = it->elem; |
dcf0ffdf | 4144 | TRACE("Establishing %cid mapping for \"%d\" in new " |
f8aa4bf3 | 4145 | "user namespace: nsuid %lu - hostid %lu - range " |
0fd73091 CB |
4146 | "%lu", |
4147 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4148 | map->nsid, map->hostid, map->range); | |
f8aa4bf3 | 4149 | } |
4355ab5f SH |
4150 | } |
4151 | ||
f8aa4bf3 | 4152 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 4153 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 | 4154 | if (ret < 0) { |
0fd73091 | 4155 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); |
f8aa4bf3 | 4156 | goto on_error; |
4355ab5f SH |
4157 | } |
4158 | ||
f8aa4bf3 | 4159 | /* Tell child to proceed. */ |
4355ab5f | 4160 | if (write(p[1], &c, 1) != 1) { |
dcf0ffdf | 4161 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
f8aa4bf3 | 4162 | goto on_error; |
4355ab5f SH |
4163 | } |
4164 | ||
686dd5d1 | 4165 | on_error: |
4355ab5f SH |
4166 | if (p[0] != -1) |
4167 | close(p[0]); | |
4168 | close(p[1]); | |
f8aa4bf3 | 4169 | |
ee1b16bc TA |
4170 | /* Wait for child to finish. */ |
4171 | if (pid > 0) | |
4172 | status = wait_for_pid(pid); | |
4173 | ||
686dd5d1 CB |
4174 | if (status < 0) |
4175 | ret = -1; | |
4176 | ||
f8aa4bf3 | 4177 | return ret; |
4355ab5f | 4178 | } |
97e9cfa0 | 4179 | |
415a8851 CB |
4180 | int userns_exec_full(struct lxc_conf *conf, int (*fn)(void *), void *data, |
4181 | const char *fn_name) | |
4182 | { | |
4183 | pid_t pid; | |
4184 | uid_t euid, egid; | |
415a8851 CB |
4185 | int p[2]; |
4186 | struct id_map *map; | |
4187 | struct lxc_list *cur; | |
0fd73091 | 4188 | struct userns_fn_data d; |
415a8851 | 4189 | int ret = -1; |
0fd73091 | 4190 | char c = '1'; |
415a8851 CB |
4191 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
4192 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, | |
4193 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4194 | ||
4195 | ret = pipe(p); | |
4196 | if (ret < 0) { | |
4197 | SYSERROR("opening pipe"); | |
4198 | return -1; | |
4199 | } | |
4200 | d.fn = fn; | |
4201 | d.fn_name = fn_name; | |
4202 | d.arg = data; | |
4203 | d.p[0] = p[0]; | |
4204 | d.p[1] = p[1]; | |
4205 | ||
4206 | /* Clone child in new user namespace. */ | |
4207 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER); | |
4208 | if (pid < 0) { | |
0fd73091 | 4209 | ERROR("Failed to clone process in new user namespace"); |
415a8851 CB |
4210 | goto on_error; |
4211 | } | |
4212 | ||
4213 | close(p[0]); | |
4214 | p[0] = -1; | |
4215 | ||
4216 | euid = geteuid(); | |
4217 | egid = getegid(); | |
4218 | ||
4219 | /* Allocate new {g,u}id map list. */ | |
4220 | idmap = malloc(sizeof(*idmap)); | |
4221 | if (!idmap) | |
4222 | goto on_error; | |
4223 | lxc_list_init(idmap); | |
4224 | ||
4225 | /* Find container root. */ | |
0fd73091 | 4226 | lxc_list_for_each (cur, &conf->id_map) { |
415a8851 CB |
4227 | struct id_map *tmpmap; |
4228 | ||
4229 | tmplist = malloc(sizeof(*tmplist)); | |
4230 | if (!tmplist) | |
4231 | goto on_error; | |
4232 | ||
4233 | tmpmap = malloc(sizeof(*tmpmap)); | |
4234 | if (!tmpmap) { | |
4235 | free(tmplist); | |
4236 | goto on_error; | |
4237 | } | |
4238 | ||
4239 | memset(tmpmap, 0, sizeof(*tmpmap)); | |
4240 | memcpy(tmpmap, cur->elem, sizeof(*tmpmap)); | |
4241 | tmplist->elem = tmpmap; | |
4242 | ||
4243 | lxc_list_add_tail(idmap, tmplist); | |
4244 | ||
4245 | map = cur->elem; | |
4246 | ||
4247 | if (map->idtype == ID_TYPE_UID) | |
4248 | if (euid >= map->hostid && euid < map->hostid + map->range) | |
4249 | host_uid_map = map; | |
4250 | ||
4251 | if (map->idtype == ID_TYPE_GID) | |
4252 | if (egid >= map->hostid && egid < map->hostid + map->range) | |
4253 | host_gid_map = map; | |
4254 | ||
4255 | if (map->nsid != 0) | |
4256 | continue; | |
4257 | ||
4258 | if (map->idtype == ID_TYPE_UID) | |
4259 | if (container_root_uid == NULL) | |
4260 | container_root_uid = map; | |
4261 | ||
4262 | if (map->idtype == ID_TYPE_GID) | |
4263 | if (container_root_gid == NULL) | |
4264 | container_root_gid = map; | |
4265 | } | |
4266 | ||
4267 | if (!container_root_uid || !container_root_gid) { | |
4268 | ERROR("No mapping for container root found"); | |
4269 | goto on_error; | |
4270 | } | |
4271 | ||
4272 | /* Check whether the {g,u}id of the user has a mapping. */ | |
4273 | if (!host_uid_map) | |
c4333195 | 4274 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
415a8851 CB |
4275 | else |
4276 | host_uid_map = container_root_uid; | |
4277 | ||
4278 | if (!host_gid_map) | |
c4333195 | 4279 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); |
415a8851 CB |
4280 | else |
4281 | host_gid_map = container_root_gid; | |
4282 | ||
4283 | if (!host_uid_map) { | |
4284 | DEBUG("Failed to find mapping for uid %d", euid); | |
4285 | goto on_error; | |
4286 | } | |
4287 | ||
4288 | if (!host_gid_map) { | |
4289 | DEBUG("Failed to find mapping for gid %d", egid); | |
4290 | goto on_error; | |
4291 | } | |
4292 | ||
4293 | if (host_uid_map && (host_uid_map != container_root_uid)) { | |
4294 | /* Add container root to the map. */ | |
4295 | tmplist = malloc(sizeof(*tmplist)); | |
4296 | if (!tmplist) | |
4297 | goto on_error; | |
4298 | lxc_list_add_elem(tmplist, host_uid_map); | |
4299 | lxc_list_add_tail(idmap, tmplist); | |
4300 | } | |
4301 | /* idmap will now keep track of that memory. */ | |
4302 | host_uid_map = NULL; | |
4303 | ||
4304 | if (host_gid_map && (host_gid_map != container_root_gid)) { | |
4305 | tmplist = malloc(sizeof(*tmplist)); | |
4306 | if (!tmplist) | |
4307 | goto on_error; | |
4308 | lxc_list_add_elem(tmplist, host_gid_map); | |
4309 | lxc_list_add_tail(idmap, tmplist); | |
4310 | } | |
4311 | /* idmap will now keep track of that memory. */ | |
4312 | host_gid_map = NULL; | |
4313 | ||
4314 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || | |
4315 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
0fd73091 | 4316 | lxc_list_for_each (cur, idmap) { |
415a8851 CB |
4317 | map = cur->elem; |
4318 | TRACE("establishing %cid mapping for \"%d\" in new " | |
4319 | "user namespace: nsuid %lu - hostid %lu - range " | |
4320 | "%lu", | |
4321 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4322 | map->nsid, map->hostid, map->range); | |
4323 | } | |
4324 | } | |
4325 | ||
4326 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
4327 | ret = lxc_map_ids(idmap, pid); | |
4328 | if (ret < 0) { | |
0fd73091 | 4329 | ERROR("error setting up {g,u}id mappings for child process \"%d\"", pid); |
415a8851 CB |
4330 | goto on_error; |
4331 | } | |
4332 | ||
4333 | /* Tell child to proceed. */ | |
4334 | if (write(p[1], &c, 1) != 1) { | |
0fd73091 | 4335 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
415a8851 CB |
4336 | goto on_error; |
4337 | } | |
4338 | ||
686dd5d1 | 4339 | on_error: |
ee1b16bc TA |
4340 | if (p[0] != -1) |
4341 | close(p[0]); | |
4342 | close(p[1]); | |
4343 | ||
415a8851 | 4344 | /* Wait for child to finish. */ |
686dd5d1 CB |
4345 | if (pid > 0) |
4346 | ret = wait_for_pid(pid); | |
415a8851 | 4347 | |
415a8851 CB |
4348 | if (idmap) |
4349 | lxc_free_idmap(idmap); | |
4350 | if (host_uid_map && (host_uid_map != container_root_uid)) | |
4351 | free(host_uid_map); | |
4352 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4353 | free(host_gid_map); | |
4354 | ||
415a8851 CB |
4355 | return ret; |
4356 | } | |
4357 | ||
a96a8e8c | 4358 | /* not thread-safe, do not use from api without first forking */ |
0fd73091 | 4359 | static char *getuname(void) |
97e9cfa0 | 4360 | { |
a96a8e8c | 4361 | struct passwd *result; |
97e9cfa0 | 4362 | |
a96a8e8c SH |
4363 | result = getpwuid(geteuid()); |
4364 | if (!result) | |
97e9cfa0 SH |
4365 | return NULL; |
4366 | ||
a96a8e8c | 4367 | return strdup(result->pw_name); |
97e9cfa0 SH |
4368 | } |
4369 | ||
a96a8e8c | 4370 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4371 | static char *getgname(void) |
4372 | { | |
a96a8e8c | 4373 | struct group *result; |
97e9cfa0 | 4374 | |
a96a8e8c SH |
4375 | result = getgrgid(getegid()); |
4376 | if (!result) | |
97e9cfa0 SH |
4377 | return NULL; |
4378 | ||
a96a8e8c | 4379 | return strdup(result->gr_name); |
97e9cfa0 SH |
4380 | } |
4381 | ||
a96a8e8c | 4382 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4383 | void suggest_default_idmap(void) |
4384 | { | |
0fd73091 | 4385 | char *uname, *gname; |
97e9cfa0 SH |
4386 | FILE *f; |
4387 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; | |
97e9cfa0 | 4388 | size_t len = 0; |
0fd73091 | 4389 | char *line = NULL; |
97e9cfa0 | 4390 | |
0fd73091 CB |
4391 | uname = getuname(); |
4392 | if (!uname) | |
97e9cfa0 SH |
4393 | return; |
4394 | ||
0fd73091 CB |
4395 | gname = getgname(); |
4396 | if (!gname) { | |
97e9cfa0 SH |
4397 | free(uname); |
4398 | return; | |
4399 | } | |
4400 | ||
4401 | f = fopen(subuidfile, "r"); | |
4402 | if (!f) { | |
4403 | ERROR("Your system is not configured with subuids"); | |
4404 | free(gname); | |
4405 | free(uname); | |
4406 | return; | |
4407 | } | |
0fd73091 | 4408 | |
97e9cfa0 | 4409 | while (getline(&line, &len, f) != -1) { |
0fd73091 | 4410 | char *p, *p2; |
b7930180 | 4411 | size_t no_newline = 0; |
0fd73091 CB |
4412 | |
4413 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4414 | if (*line == '#') |
4415 | continue; | |
4416 | if (!p) | |
4417 | continue; | |
4418 | *p = '\0'; | |
4419 | p++; | |
0fd73091 | 4420 | |
97e9cfa0 SH |
4421 | if (strcmp(line, uname)) |
4422 | continue; | |
0fd73091 | 4423 | |
97e9cfa0 SH |
4424 | p2 = strchr(p, ':'); |
4425 | if (!p2) | |
4426 | continue; | |
4427 | *p2 = '\0'; | |
4428 | p2++; | |
4429 | if (!*p2) | |
4430 | continue; | |
b7930180 CB |
4431 | no_newline = strcspn(p2, "\n"); |
4432 | p2[no_newline] = '\0'; | |
4433 | ||
b7b2fde4 | 4434 | if (lxc_safe_uint(p, &uid) < 0) |
0fd73091 | 4435 | WARN("Could not parse UID"); |
b7b2fde4 | 4436 | if (lxc_safe_uint(p2, &urange) < 0) |
0fd73091 | 4437 | WARN("Could not parse UID range"); |
97e9cfa0 SH |
4438 | } |
4439 | fclose(f); | |
4440 | ||
6be7389a | 4441 | f = fopen(subgidfile, "r"); |
97e9cfa0 SH |
4442 | if (!f) { |
4443 | ERROR("Your system is not configured with subgids"); | |
4444 | free(gname); | |
4445 | free(uname); | |
4446 | return; | |
4447 | } | |
0fd73091 | 4448 | |
97e9cfa0 | 4449 | while (getline(&line, &len, f) != -1) { |
0fd73091 | 4450 | char *p, *p2; |
b7930180 | 4451 | size_t no_newline = 0; |
0fd73091 CB |
4452 | |
4453 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4454 | if (*line == '#') |
4455 | continue; | |
4456 | if (!p) | |
4457 | continue; | |
4458 | *p = '\0'; | |
4459 | p++; | |
0fd73091 | 4460 | |
97e9cfa0 SH |
4461 | if (strcmp(line, uname)) |
4462 | continue; | |
0fd73091 | 4463 | |
97e9cfa0 SH |
4464 | p2 = strchr(p, ':'); |
4465 | if (!p2) | |
4466 | continue; | |
4467 | *p2 = '\0'; | |
4468 | p2++; | |
4469 | if (!*p2) | |
4470 | continue; | |
b7930180 CB |
4471 | no_newline = strcspn(p2, "\n"); |
4472 | p2[no_newline] = '\0'; | |
4473 | ||
b7b2fde4 | 4474 | if (lxc_safe_uint(p, &gid) < 0) |
0fd73091 | 4475 | WARN("Could not parse GID"); |
b7b2fde4 | 4476 | if (lxc_safe_uint(p2, &grange) < 0) |
0fd73091 | 4477 | WARN("Could not parse GID range"); |
97e9cfa0 SH |
4478 | } |
4479 | fclose(f); | |
4480 | ||
f10fad2f | 4481 | free(line); |
97e9cfa0 SH |
4482 | |
4483 | if (!urange || !grange) { | |
4484 | ERROR("You do not have subuids or subgids allocated"); | |
4485 | ERROR("Unprivileged containers require subuids and subgids"); | |
4486 | return; | |
4487 | } | |
4488 | ||
4489 | ERROR("You must either run as root, or define uid mappings"); | |
4490 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4491 | ERROR("~/.config/lxc/default.conf:"); | |
4492 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
bdcbb6b3 CB |
4493 | ERROR("lxc.idmap = u 0 %u %u", uid, urange); |
4494 | ERROR("lxc.idmap = g 0 %u %u", gid, grange); | |
97e9cfa0 SH |
4495 | |
4496 | free(gname); | |
4497 | free(uname); | |
4498 | } | |
aaf26830 | 4499 | |
a7307747 SH |
4500 | static void free_cgroup_settings(struct lxc_list *result) |
4501 | { | |
4502 | struct lxc_list *iterator, *next; | |
4503 | ||
0fd73091 | 4504 | lxc_list_for_each_safe (iterator, result, next) { |
a7307747 SH |
4505 | lxc_list_del(iterator); |
4506 | free(iterator); | |
4507 | } | |
4508 | free(result); | |
4509 | } | |
4510 | ||
0fd73091 | 4511 | /* Return the list of cgroup_settings sorted according to the following rules |
aaf26830 KT |
4512 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes |
4513 | */ | |
0fd73091 | 4514 | struct lxc_list *sort_cgroup_settings(struct lxc_list *cgroup_settings) |
aaf26830 KT |
4515 | { |
4516 | struct lxc_list *result; | |
aaf26830 | 4517 | struct lxc_cgroup *cg = NULL; |
0fd73091 | 4518 | struct lxc_list *it = NULL, *item = NULL, *memsw_limit = NULL; |
aaf26830 KT |
4519 | |
4520 | result = malloc(sizeof(*result)); | |
0fd73091 | 4521 | if (!result) |
fac7c663 | 4522 | return NULL; |
aaf26830 KT |
4523 | lxc_list_init(result); |
4524 | ||
0fd73091 CB |
4525 | /* Iterate over the cgroup settings and copy them to the output list. */ |
4526 | lxc_list_for_each (it, cgroup_settings) { | |
aaf26830 | 4527 | item = malloc(sizeof(*item)); |
fac7c663 | 4528 | if (!item) { |
a7307747 | 4529 | free_cgroup_settings(result); |
fac7c663 KT |
4530 | return NULL; |
4531 | } | |
0fd73091 | 4532 | |
aaf26830 KT |
4533 | item->elem = it->elem; |
4534 | cg = it->elem; | |
4535 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
4536 | /* Store the memsw_limit location */ | |
4537 | memsw_limit = item; | |
0fd73091 CB |
4538 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && |
4539 | memsw_limit != NULL) { | |
4540 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found | |
4541 | * before lxc.cgroup.memory.limit_in_bytes, swap these | |
4542 | * two items */ | |
aaf26830 KT |
4543 | item->elem = memsw_limit->elem; |
4544 | memsw_limit->elem = it->elem; | |
4545 | } | |
4546 | lxc_list_add_tail(result, item); | |
4547 | } | |
4548 | ||
4549 | return result; | |
a7307747 | 4550 | } |