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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 | 25 | #include "config.h" |
0d190408 | 26 | #include "confile.h" |
d06245b8 | 27 | |
9d257a2a | 28 | #include <arpa/inet.h> |
8f3e280e CB |
29 | #include <dirent.h> |
30 | #include <errno.h> | |
31 | #include <fcntl.h> | |
32 | #include <grp.h> | |
33 | #include <inttypes.h> | |
34 | #include <libgen.h> | |
9d257a2a CB |
35 | #include <linux/loop.h> |
36 | #include <net/if.h> | |
37 | #include <netinet/in.h> | |
8f3e280e CB |
38 | #include <pwd.h> |
39 | #include <stdarg.h> | |
0ad19a3f | 40 | #include <stdio.h> |
0ad19a3f | 41 | #include <stdlib.h> |
0ad19a3f | 42 | #include <string.h> |
8f3e280e CB |
43 | #include <sys/mman.h> |
44 | #include <sys/mount.h> | |
45 | #include <sys/param.h> | |
46 | #include <sys/prctl.h> | |
6a49f05e | 47 | #include <sys/sendfile.h> |
8f3e280e | 48 | #include <sys/socket.h> |
9d257a2a | 49 | #include <sys/stat.h> |
2d76d1d7 | 50 | #include <sys/syscall.h> |
9d257a2a | 51 | #include <sys/sysmacros.h> |
97e9cfa0 | 52 | #include <sys/types.h> |
8f3e280e CB |
53 | #include <sys/utsname.h> |
54 | #include <sys/wait.h> | |
9d257a2a CB |
55 | #include <time.h> |
56 | #include <unistd.h> | |
1d52bdf7 | 57 | |
af6824fc | 58 | #ifdef MAJOR_IN_MKDEV |
9d257a2a | 59 | #include <sys/mkdev.h> |
af6824fc | 60 | #endif |
af6824fc | 61 | |
614305f3 | 62 | #ifdef HAVE_STATVFS |
2938f7c8 | 63 | #include <sys/statvfs.h> |
614305f3 | 64 | #endif |
e827ff7e SG |
65 | |
66 | #if HAVE_PTY_H | |
b0a33c1e | 67 | #include <pty.h> |
e827ff7e SG |
68 | #else |
69 | #include <../include/openpty.h> | |
70 | #endif | |
0ad19a3f | 71 | |
9d257a2a CB |
72 | #if HAVE_LIBCAP |
73 | #include <sys/capability.h> | |
74 | #endif | |
75 | ||
76 | #if HAVE_SYS_PERSONALITY_H | |
77 | #include <sys/personality.h> | |
78 | #endif | |
79 | ||
f1e05b90 DJ |
80 | #ifndef HAVE_STRLCAT |
81 | #include "include/strlcat.h" | |
82 | #endif | |
83 | ||
9d257a2a CB |
84 | #if IS_BIONIC |
85 | #include <../include/lxcmntent.h> | |
86 | #else | |
87 | #include <mntent.h> | |
88 | #endif | |
89 | ||
90 | #if !defined(HAVE_PRLIMIT) && defined(HAVE_PRLIMIT64) | |
91 | #include <../include/prlimit.h> | |
92 | #endif | |
93 | ||
e8bd4e43 | 94 | #include "af_unix.h" |
9d257a2a | 95 | #include "caps.h" |
8f3e280e | 96 | #include "cgroup.h" |
1b09f2c0 | 97 | #include "conf.h" |
1ed6ba91 | 98 | #include "confile_utils.h" |
8f3e280e | 99 | #include "error.h" |
1b09f2c0 | 100 | #include "log.h" |
0ed9b1bc | 101 | #include "lsm/lsm.h" |
025ed0f3 | 102 | #include "lxclock.h" |
8f3e280e | 103 | #include "lxcseccomp.h" |
4355ab5f | 104 | #include "namespace.h" |
8f3e280e CB |
105 | #include "network.h" |
106 | #include "parse.h" | |
732375f5 | 107 | #include "ringbuf.h" |
794248d0 | 108 | #include "start.h" |
28d832c4 | 109 | #include "storage.h" |
28d832c4 | 110 | #include "storage/overlay.h" |
0ed9b1bc | 111 | #include "terminal.h" |
8f3e280e | 112 | #include "utils.h" |
d0a36f2c | 113 | |
9d257a2a CB |
114 | #ifndef MS_PRIVATE |
115 | #define MS_PRIVATE (1<<18) | |
edaf8b1b SG |
116 | #endif |
117 | ||
9d257a2a CB |
118 | #ifndef MS_LAZYTIME |
119 | #define MS_LAZYTIME (1<<25) | |
f48b5fd8 FF |
120 | #endif |
121 | ||
ac2cecc4 | 122 | lxc_log_define(conf, lxc); |
e5bda9ee | 123 | |
0fd73091 CB |
124 | /* The lxc_conf of the container currently being worked on in an API call. |
125 | * This is used in the error calls. | |
126 | */ | |
127 | #ifdef HAVE_TLS | |
128 | __thread struct lxc_conf *current_config; | |
129 | #else | |
130 | struct lxc_conf *current_config; | |
131 | #endif | |
132 | ||
2d76d1d7 SG |
133 | /* Define pivot_root() if missing from the C library */ |
134 | #ifndef HAVE_PIVOT_ROOT | |
9d257a2a | 135 | static int pivot_root(const char *new_root, const char *put_old) |
2d76d1d7 SG |
136 | { |
137 | #ifdef __NR_pivot_root | |
8f3e280e | 138 | return syscall(__NR_pivot_root, new_root, put_old); |
2d76d1d7 | 139 | #else |
8f3e280e CB |
140 | errno = ENOSYS; |
141 | return -1; | |
2d76d1d7 SG |
142 | #endif |
143 | } | |
144 | #else | |
9d257a2a | 145 | extern int pivot_root(const char *new_root, const char *put_old); |
8912711c CB |
146 | #endif |
147 | ||
0fd73091 CB |
148 | char *lxchook_names[NUM_LXC_HOOKS] = { |
149 | "pre-start", | |
150 | "pre-mount", | |
151 | "mount", | |
152 | "autodev", | |
153 | "start", | |
154 | "stop", | |
155 | "post-stop", | |
156 | "clone", | |
157 | "destroy", | |
158 | "start-host" | |
159 | }; | |
72d0e1cb | 160 | |
998ac676 RT |
161 | struct mount_opt { |
162 | char *name; | |
163 | int clear; | |
164 | int flag; | |
165 | }; | |
166 | ||
81810dd1 DL |
167 | struct caps_opt { |
168 | char *name; | |
169 | int value; | |
170 | }; | |
171 | ||
c6d09e15 WB |
172 | struct limit_opt { |
173 | char *name; | |
174 | int value; | |
175 | }; | |
176 | ||
998ac676 | 177 | static struct mount_opt mount_opt[] = { |
470b359b CB |
178 | { "async", 1, MS_SYNCHRONOUS }, |
179 | { "atime", 1, MS_NOATIME }, | |
180 | { "bind", 0, MS_BIND }, | |
88d413d5 | 181 | { "defaults", 0, 0 }, |
88d413d5 | 182 | { "dev", 1, MS_NODEV }, |
470b359b | 183 | { "diratime", 1, MS_NODIRATIME }, |
88d413d5 | 184 | { "dirsync", 0, MS_DIRSYNC }, |
470b359b | 185 | { "exec", 1, MS_NOEXEC }, |
8912711c | 186 | { "lazytime", 0, MS_LAZYTIME }, |
88d413d5 | 187 | { "mand", 0, MS_MANDLOCK }, |
88d413d5 | 188 | { "noatime", 0, MS_NOATIME }, |
470b359b | 189 | { "nodev", 0, MS_NODEV }, |
88d413d5 | 190 | { "nodiratime", 0, MS_NODIRATIME }, |
470b359b CB |
191 | { "noexec", 0, MS_NOEXEC }, |
192 | { "nomand", 1, MS_MANDLOCK }, | |
193 | { "norelatime", 1, MS_RELATIME }, | |
194 | { "nostrictatime", 1, MS_STRICTATIME }, | |
195 | { "nosuid", 0, MS_NOSUID }, | |
88d413d5 SW |
196 | { "rbind", 0, MS_BIND|MS_REC }, |
197 | { "relatime", 0, MS_RELATIME }, | |
470b359b CB |
198 | { "remount", 0, MS_REMOUNT }, |
199 | { "ro", 0, MS_RDONLY }, | |
200 | { "rw", 1, MS_RDONLY }, | |
88d413d5 | 201 | { "strictatime", 0, MS_STRICTATIME }, |
470b359b CB |
202 | { "suid", 1, MS_NOSUID }, |
203 | { "sync", 0, MS_SYNCHRONOUS }, | |
88d413d5 | 204 | { NULL, 0, 0 }, |
998ac676 RT |
205 | }; |
206 | ||
d840039e | 207 | static struct mount_opt propagation_opt[] = { |
0fd73091 CB |
208 | { "private", 0, MS_PRIVATE }, |
209 | { "shared", 0, MS_SHARED }, | |
210 | { "slave", 0, MS_SLAVE }, | |
211 | { "unbindable", 0, MS_UNBINDABLE }, | |
212 | { "rprivate", 0, MS_PRIVATE|MS_REC }, | |
213 | { "rshared", 0, MS_SHARED|MS_REC }, | |
214 | { "rslave", 0, MS_SLAVE|MS_REC }, | |
215 | { "runbindable", 0, MS_UNBINDABLE|MS_REC }, | |
216 | { NULL, 0, 0 }, | |
d840039e YT |
217 | }; |
218 | ||
81810dd1 | 219 | static struct caps_opt caps_opt[] = { |
8560cd36 | 220 | #if HAVE_LIBCAP |
0fd73091 CB |
221 | { "chown", CAP_CHOWN }, |
222 | { "dac_override", CAP_DAC_OVERRIDE }, | |
223 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
224 | { "fowner", CAP_FOWNER }, | |
225 | { "fsetid", CAP_FSETID }, | |
226 | { "kill", CAP_KILL }, | |
227 | { "setgid", CAP_SETGID }, | |
228 | { "setuid", CAP_SETUID }, | |
229 | { "setpcap", CAP_SETPCAP }, | |
230 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
231 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
232 | { "net_broadcast", CAP_NET_BROADCAST }, | |
233 | { "net_admin", CAP_NET_ADMIN }, | |
234 | { "net_raw", CAP_NET_RAW }, | |
235 | { "ipc_lock", CAP_IPC_LOCK }, | |
236 | { "ipc_owner", CAP_IPC_OWNER }, | |
237 | { "sys_module", CAP_SYS_MODULE }, | |
238 | { "sys_rawio", CAP_SYS_RAWIO }, | |
239 | { "sys_chroot", CAP_SYS_CHROOT }, | |
240 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
241 | { "sys_pacct", CAP_SYS_PACCT }, | |
242 | { "sys_admin", CAP_SYS_ADMIN }, | |
243 | { "sys_boot", CAP_SYS_BOOT }, | |
244 | { "sys_nice", CAP_SYS_NICE }, | |
245 | { "sys_resource", CAP_SYS_RESOURCE }, | |
246 | { "sys_time", CAP_SYS_TIME }, | |
247 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
248 | { "mknod", CAP_MKNOD }, | |
249 | { "lease", CAP_LEASE }, | |
57b837e2 | 250 | #ifdef CAP_AUDIT_READ |
0fd73091 | 251 | { "audit_read", CAP_AUDIT_READ }, |
57b837e2 | 252 | #endif |
9527e566 | 253 | #ifdef CAP_AUDIT_WRITE |
0fd73091 | 254 | { "audit_write", CAP_AUDIT_WRITE }, |
9527e566 FW |
255 | #endif |
256 | #ifdef CAP_AUDIT_CONTROL | |
0fd73091 | 257 | { "audit_control", CAP_AUDIT_CONTROL }, |
9527e566 | 258 | #endif |
0fd73091 CB |
259 | { "setfcap", CAP_SETFCAP }, |
260 | { "mac_override", CAP_MAC_OVERRIDE }, | |
261 | { "mac_admin", CAP_MAC_ADMIN }, | |
5170c716 | 262 | #ifdef CAP_SYSLOG |
0fd73091 | 263 | { "syslog", CAP_SYSLOG }, |
5170c716 CS |
264 | #endif |
265 | #ifdef CAP_WAKE_ALARM | |
0fd73091 | 266 | { "wake_alarm", CAP_WAKE_ALARM }, |
5170c716 | 267 | #endif |
2b54359b | 268 | #ifdef CAP_BLOCK_SUSPEND |
0fd73091 | 269 | { "block_suspend", CAP_BLOCK_SUSPEND }, |
2b54359b | 270 | #endif |
495d2046 | 271 | #endif |
8560cd36 | 272 | }; |
81810dd1 | 273 | |
c6d09e15 WB |
274 | static struct limit_opt limit_opt[] = { |
275 | #ifdef RLIMIT_AS | |
276 | { "as", RLIMIT_AS }, | |
277 | #endif | |
278 | #ifdef RLIMIT_CORE | |
279 | { "core", RLIMIT_CORE }, | |
280 | #endif | |
281 | #ifdef RLIMIT_CPU | |
282 | { "cpu", RLIMIT_CPU }, | |
283 | #endif | |
284 | #ifdef RLIMIT_DATA | |
285 | { "data", RLIMIT_DATA }, | |
286 | #endif | |
287 | #ifdef RLIMIT_FSIZE | |
288 | { "fsize", RLIMIT_FSIZE }, | |
289 | #endif | |
290 | #ifdef RLIMIT_LOCKS | |
291 | { "locks", RLIMIT_LOCKS }, | |
292 | #endif | |
293 | #ifdef RLIMIT_MEMLOCK | |
294 | { "memlock", RLIMIT_MEMLOCK }, | |
295 | #endif | |
296 | #ifdef RLIMIT_MSGQUEUE | |
297 | { "msgqueue", RLIMIT_MSGQUEUE }, | |
298 | #endif | |
299 | #ifdef RLIMIT_NICE | |
300 | { "nice", RLIMIT_NICE }, | |
301 | #endif | |
302 | #ifdef RLIMIT_NOFILE | |
303 | { "nofile", RLIMIT_NOFILE }, | |
304 | #endif | |
305 | #ifdef RLIMIT_NPROC | |
306 | { "nproc", RLIMIT_NPROC }, | |
307 | #endif | |
308 | #ifdef RLIMIT_RSS | |
309 | { "rss", RLIMIT_RSS }, | |
310 | #endif | |
311 | #ifdef RLIMIT_RTPRIO | |
312 | { "rtprio", RLIMIT_RTPRIO }, | |
313 | #endif | |
314 | #ifdef RLIMIT_RTTIME | |
315 | { "rttime", RLIMIT_RTTIME }, | |
316 | #endif | |
317 | #ifdef RLIMIT_SIGPENDING | |
318 | { "sigpending", RLIMIT_SIGPENDING }, | |
319 | #endif | |
320 | #ifdef RLIMIT_STACK | |
321 | { "stack", RLIMIT_STACK }, | |
322 | #endif | |
323 | }; | |
324 | ||
91c3830e SH |
325 | static int run_buffer(char *buffer) |
326 | { | |
8e7da691 | 327 | int ret; |
0fd73091 CB |
328 | char *output; |
329 | struct lxc_popen_FILE *f; | |
91c3830e | 330 | |
ebec9176 | 331 | f = lxc_popen(buffer); |
91c3830e | 332 | if (!f) { |
3f60c2f7 | 333 | SYSERROR("Failed to popen() %s", buffer); |
91c3830e SH |
334 | return -1; |
335 | } | |
336 | ||
337 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
338 | if (!output) { | |
3f60c2f7 | 339 | ERROR("Failed to allocate memory for %s", buffer); |
ebec9176 | 340 | lxc_pclose(f); |
91c3830e SH |
341 | return -1; |
342 | } | |
343 | ||
062b72c6 | 344 | while (fgets(output, LXC_LOG_BUFFER_SIZE, f->f)) |
3f60c2f7 | 345 | DEBUG("Script %s with output: %s", buffer, output); |
91c3830e SH |
346 | |
347 | free(output); | |
348 | ||
ebec9176 | 349 | ret = lxc_pclose(f); |
8e7da691 | 350 | if (ret == -1) { |
3f60c2f7 | 351 | SYSERROR("Script exited with error"); |
91c3830e | 352 | return -1; |
8e7da691 | 353 | } else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) { |
3f60c2f7 | 354 | ERROR("Script exited with status %d", WEXITSTATUS(ret)); |
8e7da691 DE |
355 | return -1; |
356 | } else if (WIFSIGNALED(ret)) { | |
3f60c2f7 | 357 | ERROR("Script terminated by signal %d", WTERMSIG(ret)); |
8e7da691 | 358 | return -1; |
91c3830e SH |
359 | } |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
14a7b0f9 CB |
364 | int run_script_argv(const char *name, unsigned int hook_version, |
365 | const char *section, const char *script, | |
586b1ce7 | 366 | const char *hookname, char **argv) |
148e91f5 | 367 | { |
3f60c2f7 | 368 | int buf_pos, i, ret; |
148e91f5 | 369 | char *buffer; |
6f8d00d2 | 370 | int fret = -1; |
d08e5708 | 371 | size_t size = 0; |
148e91f5 | 372 | |
3f60c2f7 CB |
373 | if (hook_version == 0) |
374 | INFO("Executing script \"%s\" for container \"%s\", config " | |
375 | "section \"%s\"", script, name, section); | |
376 | else | |
377 | INFO("Executing script \"%s\" for container \"%s\"", script, name); | |
148e91f5 | 378 | |
586b1ce7 CB |
379 | for (i = 0; argv && argv[i]; i++) |
380 | size += strlen(argv[i]) + 1; | |
148e91f5 | 381 | |
3f60c2f7 | 382 | size += sizeof("exec"); |
148e91f5 | 383 | size += strlen(script); |
3f60c2f7 CB |
384 | size++; |
385 | ||
148e91f5 | 386 | if (size > INT_MAX) |
3f60c2f7 | 387 | return -EFBIG; |
148e91f5 | 388 | |
3f60c2f7 | 389 | if (hook_version == 0) { |
d08e5708 CB |
390 | size += strlen(hookname); |
391 | size++; | |
392 | ||
393 | size += strlen(name); | |
394 | size++; | |
395 | ||
396 | size += strlen(section); | |
397 | size++; | |
398 | ||
399 | if (size > INT_MAX) | |
400 | return -EFBIG; | |
327cce76 | 401 | } |
3f60c2f7 | 402 | |
6f8d00d2 CB |
403 | buffer = malloc(size); |
404 | if (!buffer) | |
405 | return -ENOMEM; | |
406 | ||
327cce76 | 407 | if (hook_version == 0) |
3f60c2f7 | 408 | buf_pos = snprintf(buffer, size, "exec %s %s %s %s", script, name, section, hookname); |
327cce76 | 409 | else |
3f60c2f7 | 410 | buf_pos = snprintf(buffer, size, "exec %s", script); |
327cce76 CB |
411 | if (buf_pos < 0 || (size_t)buf_pos >= size) { |
412 | ERROR("Failed to create command line for script \"%s\"", script); | |
6f8d00d2 | 413 | goto on_error; |
327cce76 | 414 | } |
3f60c2f7 | 415 | |
327cce76 | 416 | if (hook_version == 1) { |
3f60c2f7 CB |
417 | ret = setenv("LXC_HOOK_TYPE", hookname, 1); |
418 | if (ret < 0) { | |
419 | SYSERROR("Failed to set environment variable: " | |
420 | "LXC_HOOK_TYPE=%s", hookname); | |
6f8d00d2 | 421 | goto on_error; |
3f60c2f7 | 422 | } |
90f20466 | 423 | TRACE("Set environment variable: LXC_HOOK_TYPE=%s", hookname); |
3f60c2f7 CB |
424 | |
425 | ret = setenv("LXC_HOOK_SECTION", section, 1); | |
426 | if (ret < 0) { | |
427 | SYSERROR("Failed to set environment variable: " | |
428 | "LXC_HOOK_SECTION=%s", section); | |
6f8d00d2 | 429 | goto on_error; |
3f60c2f7 CB |
430 | } |
431 | TRACE("Set environment variable: LXC_HOOK_SECTION=%s", section); | |
14a7b0f9 CB |
432 | |
433 | if (strcmp(section, "net") == 0) { | |
434 | char *parent; | |
435 | ||
586b1ce7 | 436 | if (!argv || !argv[0]) |
6f8d00d2 | 437 | goto on_error; |
14a7b0f9 | 438 | |
586b1ce7 | 439 | ret = setenv("LXC_NET_TYPE", argv[0], 1); |
14a7b0f9 CB |
440 | if (ret < 0) { |
441 | SYSERROR("Failed to set environment variable: " | |
586b1ce7 | 442 | "LXC_NET_TYPE=%s", argv[0]); |
6f8d00d2 | 443 | goto on_error; |
14a7b0f9 | 444 | } |
586b1ce7 | 445 | TRACE("Set environment variable: LXC_NET_TYPE=%s", argv[0]); |
14a7b0f9 | 446 | |
586b1ce7 | 447 | parent = argv[1] ? argv[1] : ""; |
14a7b0f9 | 448 | |
a8144263 | 449 | if (strcmp(argv[0], "macvlan") == 0) { |
14a7b0f9 CB |
450 | ret = setenv("LXC_NET_PARENT", parent, 1); |
451 | if (ret < 0) { | |
452 | SYSERROR("Failed to set environment " | |
453 | "variable: LXC_NET_PARENT=%s", parent); | |
6f8d00d2 | 454 | goto on_error; |
14a7b0f9 CB |
455 | } |
456 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
a8144263 | 457 | } else if (strcmp(argv[0], "phys") == 0) { |
14a7b0f9 CB |
458 | ret = setenv("LXC_NET_PARENT", parent, 1); |
459 | if (ret < 0) { | |
460 | SYSERROR("Failed to set environment " | |
461 | "variable: LXC_NET_PARENT=%s", parent); | |
6f8d00d2 | 462 | goto on_error; |
14a7b0f9 CB |
463 | } |
464 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
a8144263 | 465 | } else if (strcmp(argv[0], "veth") == 0) { |
586b1ce7 | 466 | char *peer = argv[2] ? argv[2] : ""; |
14a7b0f9 CB |
467 | |
468 | ret = setenv("LXC_NET_PEER", peer, 1); | |
469 | if (ret < 0) { | |
470 | SYSERROR("Failed to set environment " | |
471 | "variable: LXC_NET_PEER=%s", peer); | |
6f8d00d2 | 472 | goto on_error; |
14a7b0f9 CB |
473 | } |
474 | TRACE("Set environment variable: LXC_NET_PEER=%s", peer); | |
475 | ||
476 | ret = setenv("LXC_NET_PARENT", parent, 1); | |
477 | if (ret < 0) { | |
478 | SYSERROR("Failed to set environment " | |
479 | "variable: LXC_NET_PARENT=%s", parent); | |
6f8d00d2 | 480 | goto on_error; |
14a7b0f9 CB |
481 | } |
482 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
483 | } | |
484 | } | |
148e91f5 SH |
485 | } |
486 | ||
586b1ce7 | 487 | for (i = 0; argv && argv[i]; i++) { |
3f60c2f7 CB |
488 | size_t len = size - buf_pos; |
489 | ||
586b1ce7 | 490 | ret = snprintf(buffer + buf_pos, len, " %s", argv[i]); |
3f60c2f7 CB |
491 | if (ret < 0 || (size_t)ret >= len) { |
492 | ERROR("Failed to create command line for script \"%s\"", script); | |
6f8d00d2 | 493 | goto on_error; |
148e91f5 | 494 | } |
3f60c2f7 | 495 | buf_pos += ret; |
148e91f5 SH |
496 | } |
497 | ||
6f8d00d2 CB |
498 | fret = run_buffer(buffer); |
499 | ||
500 | on_error: | |
501 | free(buffer); | |
502 | return fret; | |
148e91f5 SH |
503 | } |
504 | ||
811ef482 | 505 | int run_script(const char *name, const char *section, const char *script, ...) |
e3b4c4c4 | 506 | { |
abbfd20b | 507 | int ret; |
91c3830e | 508 | char *buffer, *p; |
abbfd20b | 509 | va_list ap; |
0fd73091 | 510 | size_t size = 0; |
751d9dcd | 511 | |
0fd73091 | 512 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\"", |
751d9dcd | 513 | script, name, section); |
e3b4c4c4 | 514 | |
abbfd20b DL |
515 | va_start(ap, script); |
516 | while ((p = va_arg(ap, char *))) | |
95642a10 | 517 | size += strlen(p) + 1; |
abbfd20b DL |
518 | va_end(ap); |
519 | ||
6d1a5f93 | 520 | size += strlen("exec"); |
abbfd20b DL |
521 | size += strlen(script); |
522 | size += strlen(name); | |
523 | size += strlen(section); | |
6d1a5f93 | 524 | size += 4; |
abbfd20b | 525 | |
95642a10 MS |
526 | if (size > INT_MAX) |
527 | return -1; | |
528 | ||
529 | buffer = alloca(size); | |
6d1a5f93 | 530 | ret = snprintf(buffer, size, "exec %s %s %s", script, name, section); |
0fd73091 | 531 | if (ret < 0 || ret >= size) |
9ba8130c | 532 | return -1; |
751d9dcd | 533 | |
abbfd20b | 534 | va_start(ap, script); |
9ba8130c | 535 | while ((p = va_arg(ap, char *))) { |
062b72c6 | 536 | int len = size - ret; |
9ba8130c SH |
537 | int rc; |
538 | rc = snprintf(buffer + ret, len, " %s", p); | |
7b5a2435 DJ |
539 | if (rc < 0 || rc >= len) { |
540 | va_end(ap); | |
9ba8130c | 541 | return -1; |
7b5a2435 | 542 | } |
9ba8130c SH |
543 | ret += rc; |
544 | } | |
abbfd20b | 545 | va_end(ap); |
751d9dcd | 546 | |
91c3830e | 547 | return run_buffer(buffer); |
e3b4c4c4 ST |
548 | } |
549 | ||
0fd73091 | 550 | /* pin_rootfs |
63fc76c3 | 551 | * if rootfs is a directory, then open ${rootfs}/.lxc-keep for writing for |
b7ed4bf0 CS |
552 | * the duration of the container run, to prevent the container from marking |
553 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
63fc76c3 GJ |
554 | * no name pollution is happens. |
555 | * don't unlink on NFS to avoid random named stale handles. | |
0c547523 SH |
556 | * return -1 on error. |
557 | * return -2 if nothing needed to be pinned. | |
558 | * return an open fd (>=0) if we pinned it. | |
559 | */ | |
560 | int pin_rootfs(const char *rootfs) | |
561 | { | |
0fd73091 CB |
562 | int fd, ret; |
563 | char absrootfs[MAXPATHLEN], absrootfspin[MAXPATHLEN]; | |
0c547523 | 564 | struct stat s; |
63fc76c3 | 565 | struct statfs sfs; |
0c547523 | 566 | |
e99ee0de | 567 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 568 | return -2; |
e99ee0de | 569 | |
00ec333b | 570 | if (!realpath(rootfs, absrootfs)) |
9be53773 | 571 | return -2; |
0c547523 | 572 | |
0fd73091 CB |
573 | ret = stat(absrootfs, &s); |
574 | if (ret < 0) | |
0c547523 | 575 | return -1; |
0c547523 | 576 | |
72f919c4 | 577 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
578 | return -2; |
579 | ||
63fc76c3 | 580 | ret = snprintf(absrootfspin, MAXPATHLEN, "%s/.lxc-keep", absrootfs); |
00ec333b | 581 | if (ret >= MAXPATHLEN) |
0c547523 | 582 | return -1; |
0c547523 | 583 | |
0fd73091 | 584 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR | S_IRUSR); |
b7ed4bf0 CS |
585 | if (fd < 0) |
586 | return fd; | |
0fd73091 | 587 | |
205fc010 CB |
588 | ret = fstatfs (fd, &sfs); |
589 | if (ret < 0) | |
590 | return fd; | |
63fc76c3 GJ |
591 | |
592 | if (sfs.f_type == NFS_SUPER_MAGIC) { | |
205fc010 | 593 | DEBUG("Rootfs on NFS, not unlinking pin file \"%s\"", absrootfspin); |
63fc76c3 GJ |
594 | return fd; |
595 | } | |
596 | ||
b7ed4bf0 | 597 | (void)unlink(absrootfspin); |
0fd73091 | 598 | |
0c547523 SH |
599 | return fd; |
600 | } | |
601 | ||
0fd73091 CB |
602 | /* If we are asking to remount something, make sure that any NOEXEC etc are |
603 | * honored. | |
e2a7e8dc | 604 | */ |
5ae72b98 | 605 | unsigned long add_required_remount_flags(const char *s, const char *d, |
5285689c | 606 | unsigned long flags) |
e2a7e8dc | 607 | { |
614305f3 | 608 | #ifdef HAVE_STATVFS |
0fd73091 | 609 | int ret; |
e2a7e8dc SH |
610 | struct statvfs sb; |
611 | unsigned long required_flags = 0; | |
612 | ||
e2a7e8dc SH |
613 | if (!s) |
614 | s = d; | |
615 | ||
616 | if (!s) | |
617 | return flags; | |
0fd73091 CB |
618 | |
619 | ret = statvfs(s, &sb); | |
620 | if (ret < 0) | |
e2a7e8dc SH |
621 | return flags; |
622 | ||
69eadddb CB |
623 | if (flags & MS_REMOUNT) { |
624 | if (sb.f_flag & MS_NOSUID) | |
625 | required_flags |= MS_NOSUID; | |
626 | if (sb.f_flag & MS_NODEV) | |
627 | required_flags |= MS_NODEV; | |
628 | if (sb.f_flag & MS_RDONLY) | |
629 | required_flags |= MS_RDONLY; | |
630 | if (sb.f_flag & MS_NOEXEC) | |
631 | required_flags |= MS_NOEXEC; | |
632 | } | |
633 | ||
634 | if (sb.f_flag & MS_NOATIME) | |
635 | required_flags |= MS_NOATIME; | |
636 | if (sb.f_flag & MS_NODIRATIME) | |
637 | required_flags |= MS_NODIRATIME; | |
638 | if (sb.f_flag & MS_LAZYTIME) | |
639 | required_flags |= MS_LAZYTIME; | |
640 | if (sb.f_flag & MS_RELATIME) | |
641 | required_flags |= MS_RELATIME; | |
642 | if (sb.f_flag & MS_STRICTATIME) | |
643 | required_flags |= MS_STRICTATIME; | |
e2a7e8dc SH |
644 | |
645 | return flags | required_flags; | |
614305f3 SH |
646 | #else |
647 | return flags; | |
648 | #endif | |
e2a7e8dc SH |
649 | } |
650 | ||
6b741397 CB |
651 | static int add_shmount_to_list(struct lxc_conf *conf) |
652 | { | |
0d190408 | 653 | char new_mount[MAXPATHLEN]; |
0d190408 | 654 | /* Offset for the leading '/' since the path_cont |
6b741397 CB |
655 | * is absolute inside the container. |
656 | */ | |
657 | int offset = 1, ret = -1; | |
0d190408 | 658 | |
6b741397 CB |
659 | ret = snprintf(new_mount, sizeof(new_mount), |
660 | "%s %s none bind,create=dir 0 0", conf->shmount.path_host, | |
661 | conf->shmount.path_cont + offset); | |
60534030 | 662 | if (ret < 0 || (size_t)ret >= sizeof(new_mount)) |
0d190408 LT |
663 | return -1; |
664 | ||
6b741397 | 665 | return add_elem_to_mount_list(new_mount, conf); |
0d190408 LT |
666 | } |
667 | ||
4fb3cba5 | 668 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 669 | { |
0fd73091 | 670 | int i, r; |
b06b8511 CS |
671 | static struct { |
672 | int match_mask; | |
673 | int match_flag; | |
674 | const char *source; | |
675 | const char *destination; | |
676 | const char *fstype; | |
677 | unsigned long flags; | |
678 | const char *options; | |
679 | } default_mounts[] = { | |
0fd73091 CB |
680 | /* Read-only bind-mounting... In older kernels, doing that |
681 | * required to do one MS_BIND mount and then | |
682 | * MS_REMOUNT|MS_RDONLY the same one. According to mount(2) | |
683 | * manpage, MS_BIND honors MS_RDONLY from kernel 2.6.26 | |
684 | * onwards. However, this apparently does not work on kernel | |
685 | * 3.8. Unfortunately, on that very same kernel, doing the same | |
686 | * trick as above doesn't seem to work either, there one needs | |
687 | * to ALSO specify MS_BIND for the remount, otherwise the | |
688 | * entire fs is remounted read-only or the mount fails because | |
689 | * it's busy... MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for | |
690 | * kernels as low as 2.6.32... | |
368bbc02 | 691 | */ |
0fd73091 | 692 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
592fd47a | 693 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
0fd73091 CB |
694 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL }, |
695 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, | |
696 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
697 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL }, | |
698 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, | |
699 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
700 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
701 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
702 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
703 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
704 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys", "%r/sys", NULL, MS_BIND, NULL }, | |
705 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
706 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
707 | { 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 }, | |
708 | { 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 }, | |
709 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 710 | }; |
368bbc02 | 711 | |
b06b8511 | 712 | for (i = 0; default_mounts[i].match_mask; i++) { |
0fd73091 CB |
713 | int saved_errno; |
714 | unsigned long mflags; | |
715 | char *destination = NULL; | |
716 | char *source = NULL; | |
717 | if ((flags & default_mounts[i].match_mask) != default_mounts[i].match_flag) | |
718 | continue; | |
719 | ||
720 | if (default_mounts[i].source) { | |
cc4fd506 | 721 | /* will act like strdup if %r is not present */ |
0fd73091 CB |
722 | source = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].source); |
723 | if (!source) | |
cc4fd506 | 724 | return -1; |
0fd73091 | 725 | } |
f24a52d5 | 726 | |
0fd73091 CB |
727 | if (!default_mounts[i].destination) { |
728 | ERROR("BUG: auto mounts destination %d was NULL", i); | |
b06b8511 | 729 | free(source); |
0fd73091 CB |
730 | return -1; |
731 | } | |
732 | ||
733 | /* will act like strdup if %r is not present */ | |
734 | destination = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].destination); | |
735 | if (!destination) { | |
736 | saved_errno = errno; | |
737 | free(source); | |
738 | errno = saved_errno; | |
739 | return -1; | |
740 | } | |
741 | ||
742 | mflags = add_required_remount_flags(source, destination, | |
743 | default_mounts[i].flags); | |
744 | r = safe_mount(source, destination, default_mounts[i].fstype, | |
745 | mflags, default_mounts[i].options, | |
746 | conf->rootfs.path ? conf->rootfs.mount : NULL); | |
747 | saved_errno = errno; | |
748 | if (r < 0 && errno == ENOENT) { | |
749 | INFO("Mount source or target for \"%s\" on \"%s\" does " | |
750 | "not exist. Skipping", source, destination); | |
751 | r = 0; | |
752 | } else if (r < 0) { | |
753 | SYSERROR("Failed to mount \"%s\" on \"%s\" with flags %lu", source, destination, mflags); | |
754 | } | |
755 | ||
756 | free(source); | |
757 | free(destination); | |
758 | if (r < 0) { | |
759 | errno = saved_errno; | |
760 | return -1; | |
368bbc02 | 761 | } |
368bbc02 CS |
762 | } |
763 | ||
b06b8511 | 764 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
765 | int cg_flags; |
766 | ||
3f69fb12 | 767 | cg_flags = flags & (LXC_AUTO_CGROUP_MASK & ~LXC_AUTO_CGROUP_FORCE); |
0fd73091 CB |
768 | /* If the type of cgroup mount was not specified, it depends on |
769 | * the container's capabilities as to what makes sense: if we | |
770 | * have CAP_SYS_ADMIN, the read-only part can be remounted | |
771 | * read-write anyway, so we may as well default to read-write; | |
772 | * then the admin will not be given a false sense of security. | |
773 | * (And if they really want mixed r/o r/w, then they can | |
774 | * explicitly specify :mixed.) OTOH, if the container lacks | |
775 | * CAP_SYS_ADMIN, do only default to :mixed, because then the | |
776 | * container can't remount it read-write. | |
777 | */ | |
0769b82a CS |
778 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { |
779 | int has_sys_admin = 0; | |
b0ee5983 CB |
780 | |
781 | if (!lxc_list_empty(&conf->keepcaps)) | |
0769b82a | 782 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); |
b0ee5983 | 783 | else |
0769b82a | 784 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); |
b0ee5983 CB |
785 | |
786 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) | |
0769b82a | 787 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; |
b0ee5983 | 788 | else |
0769b82a | 789 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; |
0769b82a | 790 | } |
0fd73091 | 791 | |
3f69fb12 | 792 | if (flags & LXC_AUTO_CGROUP_FORCE) |
0fd73091 CB |
793 | cg_flags |= LXC_AUTO_CGROUP_FORCE; |
794 | ||
2202afc9 CB |
795 | if (!handler->cgroup_ops->mount(handler->cgroup_ops, |
796 | handler, | |
797 | conf->rootfs.path ? conf->rootfs.mount : "", | |
798 | cg_flags)) { | |
0fd73091 | 799 | SYSERROR("Failed to mount \"/sys/fs/cgroup\""); |
b06b8511 | 800 | return -1; |
368bbc02 CS |
801 | } |
802 | } | |
803 | ||
0d190408 LT |
804 | if (flags & LXC_AUTO_SHMOUNTS_MASK) { |
805 | int ret = add_shmount_to_list(conf); | |
806 | if (ret < 0) { | |
807 | ERROR("Failed to add shmount entry to container config"); | |
6b741397 | 808 | return -1; |
0d190408 LT |
809 | } |
810 | } | |
811 | ||
368bbc02 | 812 | return 0; |
368bbc02 CS |
813 | } |
814 | ||
4e5440c6 | 815 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 816 | { |
0fd73091 CB |
817 | int ret; |
818 | ||
4e5440c6 DL |
819 | if (!utsname) |
820 | return 0; | |
0ad19a3f | 821 | |
0fd73091 CB |
822 | ret = sethostname(utsname->nodename, strlen(utsname->nodename)); |
823 | if (ret < 0) { | |
824 | SYSERROR("Failed to set the hostname to \"%s\"", utsname->nodename); | |
0ad19a3f | 825 | return -1; |
826 | } | |
827 | ||
0fd73091 | 828 | INFO("Set hostname to \"%s\"", utsname->nodename); |
cd54d859 | 829 | |
0ad19a3f | 830 | return 0; |
831 | } | |
832 | ||
69aa6655 DE |
833 | struct dev_symlinks { |
834 | const char *oldpath; | |
835 | const char *name; | |
836 | }; | |
837 | ||
838 | static const struct dev_symlinks dev_symlinks[] = { | |
0fd73091 CB |
839 | { "/proc/self/fd", "fd" }, |
840 | { "/proc/self/fd/0", "stdin" }, | |
841 | { "/proc/self/fd/1", "stdout" }, | |
842 | { "/proc/self/fd/2", "stderr" }, | |
69aa6655 DE |
843 | }; |
844 | ||
ed8704d0 | 845 | static int lxc_setup_dev_symlinks(const struct lxc_rootfs *rootfs) |
69aa6655 | 846 | { |
0fd73091 | 847 | int i, ret; |
69aa6655 | 848 | char path[MAXPATHLEN]; |
09227be2 | 849 | struct stat s; |
69aa6655 | 850 | |
69aa6655 DE |
851 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { |
852 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
0fd73091 CB |
853 | |
854 | ret = snprintf(path, sizeof(path), "%s/dev/%s", | |
855 | rootfs->path ? rootfs->mount : "", d->name); | |
69aa6655 DE |
856 | if (ret < 0 || ret >= MAXPATHLEN) |
857 | return -1; | |
09227be2 | 858 | |
0fd73091 CB |
859 | /* Stat the path first. If we don't get an error accept it as |
860 | * is and don't try to create it | |
09227be2 | 861 | */ |
0fd73091 CB |
862 | ret = stat(path, &s); |
863 | if (ret == 0) | |
09227be2 | 864 | continue; |
09227be2 | 865 | |
69aa6655 DE |
866 | ret = symlink(d->oldpath, path); |
867 | if (ret && errno != EEXIST) { | |
0fd73091 CB |
868 | if (errno == EROFS) { |
869 | WARN("Failed to create \"%s\". Read-only filesystem", path); | |
09227be2 | 870 | } else { |
0fd73091 | 871 | SYSERROR("Failed to create \"%s\"", path); |
09227be2 MW |
872 | return -1; |
873 | } | |
69aa6655 DE |
874 | } |
875 | } | |
0fd73091 | 876 | |
69aa6655 DE |
877 | return 0; |
878 | } | |
879 | ||
2187efd3 | 880 | /* Build a space-separate list of ptys to pass to systemd. */ |
885766f5 | 881 | static bool append_ttyname(char **pp, char *name) |
b0a33c1e | 882 | { |
393903d1 | 883 | char *p; |
f1e05b90 | 884 | size_t size; |
393903d1 SH |
885 | |
886 | if (!*pp) { | |
887 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
888 | if (!*pp) | |
889 | return false; | |
0fd73091 | 890 | |
393903d1 SH |
891 | sprintf(*pp, "container_ttys=%s", name); |
892 | return true; | |
893 | } | |
0fd73091 | 894 | |
f1e05b90 DJ |
895 | size = strlen(*pp) + strlen(name) + 2; |
896 | p = realloc(*pp, size); | |
393903d1 SH |
897 | if (!p) |
898 | return false; | |
0fd73091 | 899 | |
393903d1 | 900 | *pp = p; |
f1e05b90 DJ |
901 | (void)strlcat(p, " ", size); |
902 | (void)strlcat(p, name, size); | |
0fd73091 | 903 | |
393903d1 SH |
904 | return true; |
905 | } | |
906 | ||
2187efd3 | 907 | static int lxc_setup_ttys(struct lxc_conf *conf) |
393903d1 | 908 | { |
9e1045e3 | 909 | int i, ret; |
0e4be3cf | 910 | const struct lxc_tty_info *ttys = &conf->ttys; |
885766f5 | 911 | char *ttydir = ttys->dir; |
7c6ef2a2 | 912 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
b0a33c1e | 913 | |
e8bd4e43 | 914 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
915 | return 0; |
916 | ||
885766f5 | 917 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 918 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
b0a33c1e | 919 | |
e8bd4e43 | 920 | ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1); |
73363c61 | 921 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 922 | return -1; |
9e1045e3 | 923 | |
7c6ef2a2 SH |
924 | if (ttydir) { |
925 | /* create dev/lxc/tty%d" */ | |
9e1045e3 CB |
926 | ret = snprintf(lxcpath, sizeof(lxcpath), |
927 | "/dev/%s/tty%d", ttydir, i + 1); | |
73363c61 | 928 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
7c6ef2a2 | 929 | return -1; |
9e1045e3 | 930 | |
3b7e332f | 931 | ret = mknod(path, S_IFREG | 0000, 0); |
9e1045e3 | 932 | if (ret < 0 && errno != EEXIST) { |
73363c61 | 933 | SYSERROR("Failed to create \"%s\"", lxcpath); |
7c6ef2a2 SH |
934 | return -1; |
935 | } | |
9e1045e3 | 936 | |
7c6ef2a2 | 937 | ret = unlink(path); |
9e1045e3 | 938 | if (ret < 0 && errno != ENOENT) { |
73363c61 | 939 | SYSERROR("Failed to unlink \"%s\"", path); |
7c6ef2a2 SH |
940 | return -1; |
941 | } | |
b0a33c1e | 942 | |
2520facd | 943 | ret = mount(tty->name, lxcpath, "none", MS_BIND, 0); |
9e1045e3 | 944 | if (ret < 0) { |
73363c61 | 945 | WARN("Failed to bind mount \"%s\" onto \"%s\"", |
2520facd | 946 | tty->name, path); |
7c6ef2a2 SH |
947 | continue; |
948 | } | |
0fd73091 | 949 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, |
9e1045e3 | 950 | path); |
13954cce | 951 | |
9e1045e3 CB |
952 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", |
953 | ttydir, i + 1); | |
73363c61 | 954 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
9ba8130c | 955 | return -1; |
9e1045e3 | 956 | |
7c6ef2a2 | 957 | ret = symlink(lxcpath, path); |
9e1045e3 | 958 | if (ret < 0) { |
73363c61 | 959 | SYSERROR("Failed to create symlink \"%s\" -> \"%s\"", |
9e1045e3 | 960 | path, lxcpath); |
7c6ef2a2 SH |
961 | return -1; |
962 | } | |
963 | } else { | |
9e1045e3 CB |
964 | /* If we populated /dev, then we need to create |
965 | * /dev/ttyN | |
966 | */ | |
d3ccc04e CB |
967 | ret = mknod(path, S_IFREG | 0000, 0); |
968 | if (ret < 0) /* this isn't fatal, continue */ | |
6d1400b5 | 969 | SYSERROR("Failed to create \"%s\"", path); |
9e1045e3 | 970 | |
2520facd | 971 | ret = mount(tty->name, path, "none", MS_BIND, 0); |
9e1045e3 | 972 | if (ret < 0) { |
2520facd | 973 | SYSERROR("Failed to mount '%s'->'%s'", tty->name, path); |
7c6ef2a2 SH |
974 | continue; |
975 | } | |
9e1045e3 | 976 | |
d3ccc04e | 977 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, path); |
393903d1 | 978 | } |
9e1045e3 | 979 | |
885766f5 | 980 | if (!append_ttyname(&conf->ttys.tty_names, tty->name)) { |
393903d1 SH |
981 | ERROR("Error setting up container_ttys string"); |
982 | return -1; | |
b0a33c1e | 983 | } |
984 | } | |
985 | ||
885766f5 | 986 | INFO("Finished setting up %zu /dev/tty<N> device(s)", ttys->max); |
b0a33c1e | 987 | return 0; |
988 | } | |
989 | ||
663014ee | 990 | int lxc_allocate_ttys(struct lxc_conf *conf) |
2187efd3 | 991 | { |
2187efd3 | 992 | int i, ret; |
0fd73091 | 993 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 CB |
994 | |
995 | /* no tty in the configuration */ | |
885766f5 | 996 | if (ttys->max == 0) |
2187efd3 CB |
997 | return 0; |
998 | ||
885766f5 | 999 | ttys->tty = malloc(sizeof(*ttys->tty) * ttys->max); |
0e4be3cf | 1000 | if (!ttys->tty) |
2187efd3 | 1001 | return -ENOMEM; |
2187efd3 | 1002 | |
885766f5 | 1003 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 1004 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1005 | |
386e6768 CB |
1006 | tty->master = -EBADF; |
1007 | tty->slave = -EBADF; | |
77a39805 CB |
1008 | ret = openpty(&tty->master, &tty->slave, NULL, NULL, NULL); |
1009 | if (ret < 0) { | |
0fd73091 | 1010 | SYSERROR("Failed to create tty %d", i); |
885766f5 | 1011 | ttys->max = i; |
0e4be3cf | 1012 | lxc_delete_tty(ttys); |
2187efd3 CB |
1013 | return -ENOTTY; |
1014 | } | |
1015 | ||
77a39805 CB |
1016 | ret = ttyname_r(tty->slave, tty->name, sizeof(tty->name)); |
1017 | if (ret < 0) { | |
1018 | SYSERROR("Failed to retrieve name of tty %d slave", i); | |
1019 | ttys->max = i; | |
1020 | lxc_delete_tty(ttys); | |
1021 | return -ENOTTY; | |
1022 | } | |
1023 | ||
0fd73091 | 1024 | DEBUG("Created tty \"%s\" with master fd %d and slave fd %d", |
2520facd | 1025 | tty->name, tty->master, tty->slave); |
2187efd3 CB |
1026 | |
1027 | /* Prevent leaking the file descriptors to the container */ | |
615f24ff | 1028 | ret = fd_cloexec(tty->master, true); |
2187efd3 | 1029 | if (ret < 0) |
a24c5678 | 1030 | SYSWARN("Failed to set FD_CLOEXEC flag on master fd %d of " |
1031 | "tty device \"%s\"", tty->master, tty->name); | |
2187efd3 | 1032 | |
615f24ff | 1033 | ret = fd_cloexec(tty->slave, true); |
2187efd3 | 1034 | if (ret < 0) |
a24c5678 | 1035 | SYSWARN("Failed to set FD_CLOEXEC flag on slave fd %d of " |
1036 | "tty device \"%s\"", tty->slave, tty->name); | |
2187efd3 | 1037 | |
2520facd | 1038 | tty->busy = 0; |
2187efd3 CB |
1039 | } |
1040 | ||
885766f5 | 1041 | INFO("Finished creating %zu tty devices", ttys->max); |
2187efd3 CB |
1042 | return 0; |
1043 | } | |
1044 | ||
0e4be3cf | 1045 | void lxc_delete_tty(struct lxc_tty_info *ttys) |
2187efd3 CB |
1046 | { |
1047 | int i; | |
1048 | ||
386e6768 CB |
1049 | if (!ttys->tty) |
1050 | return; | |
1051 | ||
885766f5 | 1052 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 1053 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1054 | |
386e6768 CB |
1055 | if (tty->master >= 0) { |
1056 | close(tty->master); | |
1057 | tty->master = -EBADF; | |
1058 | } | |
1059 | ||
1060 | if (tty->slave >= 0) { | |
1061 | close(tty->slave); | |
1062 | tty->slave = -EBADF; | |
1063 | } | |
2187efd3 CB |
1064 | } |
1065 | ||
0e4be3cf CB |
1066 | free(ttys->tty); |
1067 | ttys->tty = NULL; | |
2187efd3 CB |
1068 | } |
1069 | ||
1070 | static int lxc_send_ttys_to_parent(struct lxc_handler *handler) | |
1071 | { | |
1072 | int i; | |
0fd73091 | 1073 | int ret = -1; |
2187efd3 | 1074 | struct lxc_conf *conf = handler->conf; |
0e4be3cf | 1075 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 | 1076 | int sock = handler->data_sock[0]; |
2187efd3 | 1077 | |
885766f5 | 1078 | if (ttys->max == 0) |
2187efd3 CB |
1079 | return 0; |
1080 | ||
885766f5 | 1081 | for (i = 0; i < ttys->max; i++) { |
2187efd3 | 1082 | int ttyfds[2]; |
0e4be3cf | 1083 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1084 | |
2520facd CB |
1085 | ttyfds[0] = tty->master; |
1086 | ttyfds[1] = tty->slave; | |
2187efd3 CB |
1087 | |
1088 | ret = lxc_abstract_unix_send_fds(sock, ttyfds, 2, NULL, 0); | |
1089 | if (ret < 0) | |
1090 | break; | |
1091 | ||
0fd73091 | 1092 | TRACE("Sent ty \"%s\" with master fd %d and slave fd %d to " |
2520facd | 1093 | "parent", tty->name, tty->master, tty->slave); |
2187efd3 CB |
1094 | } |
1095 | ||
1096 | if (ret < 0) | |
6d1400b5 | 1097 | SYSERROR("Failed to send %zu ttys to parent", ttys->max); |
2187efd3 | 1098 | else |
885766f5 | 1099 | TRACE("Sent %zu ttys to parent", ttys->max); |
2187efd3 CB |
1100 | |
1101 | return ret; | |
1102 | } | |
1103 | ||
1104 | static int lxc_create_ttys(struct lxc_handler *handler) | |
1105 | { | |
1106 | int ret = -1; | |
1107 | struct lxc_conf *conf = handler->conf; | |
1108 | ||
663014ee | 1109 | ret = lxc_allocate_ttys(conf); |
2187efd3 CB |
1110 | if (ret < 0) { |
1111 | ERROR("Failed to allocate ttys"); | |
1112 | goto on_error; | |
1113 | } | |
1114 | ||
1115 | ret = lxc_send_ttys_to_parent(handler); | |
1116 | if (ret < 0) { | |
1117 | ERROR("Failed to send ttys to parent"); | |
1118 | goto on_error; | |
1119 | } | |
1120 | ||
1121 | if (!conf->is_execute) { | |
1122 | ret = lxc_setup_ttys(conf); | |
1123 | if (ret < 0) { | |
1124 | ERROR("Failed to setup ttys"); | |
1125 | goto on_error; | |
1126 | } | |
1127 | } | |
1128 | ||
885766f5 CB |
1129 | if (conf->ttys.tty_names) { |
1130 | ret = setenv("container_ttys", conf->ttys.tty_names, 1); | |
2187efd3 | 1131 | if (ret < 0) |
885766f5 | 1132 | SYSERROR("Failed to set \"container_ttys=%s\"", conf->ttys.tty_names); |
2187efd3 CB |
1133 | } |
1134 | ||
1135 | ret = 0; | |
1136 | ||
1137 | on_error: | |
0e4be3cf | 1138 | lxc_delete_tty(&conf->ttys); |
2187efd3 CB |
1139 | |
1140 | return ret; | |
1141 | } | |
1142 | ||
7133b912 CB |
1143 | /* Just create a path for /dev under $lxcpath/$name and in rootfs If we hit an |
1144 | * error, log it but don't fail yet. | |
91c3830e | 1145 | */ |
7133b912 CB |
1146 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, |
1147 | const char *lxcpath) | |
91c3830e SH |
1148 | { |
1149 | int ret; | |
87da4ec3 SH |
1150 | size_t clen; |
1151 | char *path; | |
87e0e273 | 1152 | mode_t cur_mask; |
91c3830e | 1153 | |
7133b912 | 1154 | INFO("Preparing \"/dev\""); |
bc6928ff | 1155 | |
14221cbb | 1156 | /* $(rootfs->mount) + "/dev/pts" + '\0' */ |
ec50007f | 1157 | clen = (rootfs->path ? strlen(rootfs->mount) : 0) + 9; |
87da4ec3 | 1158 | path = alloca(clen); |
bc6928ff | 1159 | |
ec50007f | 1160 | ret = snprintf(path, clen, "%s/dev", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1161 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1162 | return -1; |
bc6928ff | 1163 | |
87e0e273 CB |
1164 | cur_mask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
1165 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
1166 | if (ret < 0 && errno != EEXIST) { | |
1167 | SYSERROR("Failed to create \"/dev\" directory"); | |
1168 | ret = -errno; | |
1169 | goto reset_umask; | |
bc6928ff | 1170 | } |
87da4ec3 | 1171 | |
1ec0e8e3 | 1172 | ret = safe_mount("none", path, "tmpfs", 0, "size=500000,mode=755", |
7133b912 CB |
1173 | rootfs->path ? rootfs->mount : NULL); |
1174 | if (ret < 0) { | |
1175 | SYSERROR("Failed to mount tmpfs on \"%s\"", path); | |
87e0e273 | 1176 | goto reset_umask; |
91c3830e | 1177 | } |
87e0e273 | 1178 | TRACE("Mounted tmpfs on \"%s\"", path); |
87da4ec3 | 1179 | |
ec50007f | 1180 | ret = snprintf(path, clen, "%s/dev/pts", rootfs->path ? rootfs->mount : ""); |
87e0e273 CB |
1181 | if (ret < 0 || (size_t)ret >= clen) { |
1182 | ret = -1; | |
1183 | goto reset_umask; | |
1184 | } | |
87da4ec3 | 1185 | |
7133b912 | 1186 | /* If we are running on a devtmpfs mapping, dev/pts may already exist. |
bc6928ff MW |
1187 | * If not, then create it and exit if that fails... |
1188 | */ | |
87e0e273 CB |
1189 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
1190 | if (ret < 0 && errno != EEXIST) { | |
1191 | SYSERROR("Failed to create directory \"%s\"", path); | |
1192 | ret = -errno; | |
1193 | goto reset_umask; | |
91c3830e SH |
1194 | } |
1195 | ||
87e0e273 CB |
1196 | ret = 0; |
1197 | ||
1198 | reset_umask: | |
1199 | (void)umask(cur_mask); | |
1200 | ||
7133b912 | 1201 | INFO("Prepared \"/dev\""); |
87e0e273 | 1202 | return ret; |
91c3830e SH |
1203 | } |
1204 | ||
5e73416f | 1205 | struct lxc_device_node { |
74a3920a | 1206 | const char *name; |
5e73416f CB |
1207 | const mode_t mode; |
1208 | const int maj; | |
1209 | const int min; | |
c6883f38 SH |
1210 | }; |
1211 | ||
5e73416f | 1212 | static const struct lxc_device_node lxc_devices[] = { |
06749971 | 1213 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, |
5e73416f | 1214 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
06749971 CB |
1215 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, |
1216 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
5e73416f CB |
1217 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, |
1218 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
c6883f38 SH |
1219 | }; |
1220 | ||
5067e4dd CB |
1221 | |
1222 | enum { | |
1223 | LXC_DEVNODE_BIND, | |
1224 | LXC_DEVNODE_MKNOD, | |
1225 | LXC_DEVNODE_PARTIAL, | |
1226 | LXC_DEVNODE_OPEN, | |
1227 | }; | |
1228 | ||
27245ff7 | 1229 | static int lxc_fill_autodev(const struct lxc_rootfs *rootfs) |
c6883f38 | 1230 | { |
5e73416f | 1231 | int i, ret; |
c6883f38 | 1232 | char path[MAXPATHLEN]; |
3a32201c | 1233 | mode_t cmask; |
5067e4dd | 1234 | int use_mknod = LXC_DEVNODE_MKNOD; |
c6883f38 | 1235 | |
3999be0a CB |
1236 | ret = snprintf(path, MAXPATHLEN, "%s/dev", |
1237 | rootfs->path ? rootfs->mount : ""); | |
1238 | if (ret < 0 || ret >= MAXPATHLEN) | |
c6883f38 | 1239 | return -1; |
91c3830e | 1240 | |
0bbf8572 CB |
1241 | /* ignore, just don't try to fill in */ |
1242 | if (!dir_exists(path)) | |
9cb4d183 SH |
1243 | return 0; |
1244 | ||
3999be0a CB |
1245 | INFO("Populating \"/dev\""); |
1246 | ||
3a32201c | 1247 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
5e73416f CB |
1248 | for (i = 0; i < sizeof(lxc_devices) / sizeof(lxc_devices[0]); i++) { |
1249 | char hostpath[MAXPATHLEN]; | |
1250 | const struct lxc_device_node *device = &lxc_devices[i]; | |
0728ebf4 | 1251 | |
3999be0a | 1252 | ret = snprintf(path, MAXPATHLEN, "%s/dev/%s", |
5e73416f | 1253 | rootfs->path ? rootfs->mount : "", device->name); |
c6883f38 SH |
1254 | if (ret < 0 || ret >= MAXPATHLEN) |
1255 | return -1; | |
0bbf8572 | 1256 | |
5067e4dd | 1257 | if (use_mknod >= LXC_DEVNODE_MKNOD) { |
5e73416f CB |
1258 | ret = mknod(path, device->mode, makedev(device->maj, device->min)); |
1259 | if (ret == 0 || (ret < 0 && errno == EEXIST)) { | |
1260 | DEBUG("Created device node \"%s\"", path); | |
5067e4dd CB |
1261 | } else if (ret < 0) { |
1262 | if (errno != EPERM) { | |
1263 | SYSERROR("Failed to create device node \"%s\"", path); | |
1264 | return -1; | |
1265 | } | |
0bbf8572 | 1266 | |
5067e4dd | 1267 | use_mknod = LXC_DEVNODE_BIND; |
9cb4d183 | 1268 | } |
3999be0a | 1269 | |
5067e4dd CB |
1270 | /* Device nodes are fully useable. */ |
1271 | if (use_mknod == LXC_DEVNODE_OPEN) | |
1272 | continue; | |
1273 | ||
1274 | if (use_mknod == LXC_DEVNODE_MKNOD) { | |
1275 | /* See | |
1276 | * - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=55956b59df336f6738da916dbb520b6e37df9fbd | |
1277 | * - https://lists.linuxfoundation.org/pipermail/containers/2018-June/039176.html | |
1278 | */ | |
1279 | ret = open(path, O_RDONLY | O_CLOEXEC); | |
1280 | if (ret >= 0) { | |
1281 | close(ret); | |
1282 | /* Device nodes are fully useable. */ | |
1283 | use_mknod = LXC_DEVNODE_OPEN; | |
1284 | continue; | |
1285 | } | |
1286 | ||
1287 | SYSTRACE("Failed to open \"%s\" device", path); | |
1288 | /* Device nodes are only partially useable. */ | |
1289 | use_mknod = LXC_DEVNODE_PARTIAL; | |
1290 | } | |
5e73416f CB |
1291 | } |
1292 | ||
5067e4dd CB |
1293 | if (use_mknod != LXC_DEVNODE_PARTIAL) { |
1294 | /* If we are dealing with partially functional device | |
1295 | * nodes the prio mknod() call will have created the | |
1296 | * device node so we can use it as a bind-mount target. | |
1297 | */ | |
1298 | ret = mknod(path, S_IFREG | 0000, 0); | |
1299 | if (ret < 0 && errno != EEXIST) { | |
1300 | SYSERROR("Failed to create file \"%s\"", path); | |
1301 | return -1; | |
1302 | } | |
5e73416f CB |
1303 | } |
1304 | ||
1305 | /* Fallback to bind-mounting the device from the host. */ | |
1306 | ret = snprintf(hostpath, MAXPATHLEN, "/dev/%s", device->name); | |
1307 | if (ret < 0 || ret >= MAXPATHLEN) | |
1308 | return -1; | |
1309 | ||
1310 | ret = safe_mount(hostpath, path, 0, MS_BIND, NULL, | |
1311 | rootfs->path ? rootfs->mount : NULL); | |
1312 | if (ret < 0) { | |
1313 | SYSERROR("Failed to bind mount host device node \"%s\" " | |
1314 | "onto \"%s\"", hostpath, path); | |
1315 | return -1; | |
c6883f38 | 1316 | } |
5e73416f CB |
1317 | DEBUG("Bind mounted host device node \"%s\" onto \"%s\"", |
1318 | hostpath, path); | |
c6883f38 | 1319 | } |
5e73416f | 1320 | (void)umask(cmask); |
c6883f38 | 1321 | |
3999be0a | 1322 | INFO("Populated \"/dev\""); |
c6883f38 SH |
1323 | return 0; |
1324 | } | |
1325 | ||
8ce1abc2 | 1326 | static int lxc_mount_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1327 | { |
9aa76a17 | 1328 | int ret; |
10bc1861 | 1329 | struct lxc_storage *bdev; |
8ce1abc2 | 1330 | const struct lxc_rootfs *rootfs = &conf->rootfs; |
cc28d0b0 | 1331 | |
a0f379bf | 1332 | if (!rootfs->path) { |
0fd73091 CB |
1333 | ret = mount("", "/", NULL, MS_SLAVE | MS_REC, 0); |
1334 | if (ret < 0) { | |
8ce1abc2 | 1335 | SYSERROR("Failed to remount \"/\" MS_REC | MS_SLAVE"); |
a0f379bf DW |
1336 | return -1; |
1337 | } | |
0fd73091 | 1338 | |
c69bd12f | 1339 | return 0; |
a0f379bf | 1340 | } |
0ad19a3f | 1341 | |
0fd73091 CB |
1342 | ret = access(rootfs->mount, F_OK); |
1343 | if (ret != 0) { | |
1344 | SYSERROR("Failed to access to \"%s\". Check it is present", | |
12297168 | 1345 | rootfs->mount); |
b1789442 DL |
1346 | return -1; |
1347 | } | |
1348 | ||
8a388ed4 | 1349 | bdev = storage_init(conf); |
9aa76a17 | 1350 | if (!bdev) { |
0fd73091 | 1351 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1352 | rootfs->path, rootfs->mount, |
1353 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1354 | return -1; |
9be53773 | 1355 | } |
9aa76a17 CB |
1356 | |
1357 | ret = bdev->ops->mount(bdev); | |
10bc1861 | 1358 | storage_put(bdev); |
9aa76a17 | 1359 | if (ret < 0) { |
0fd73091 | 1360 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1361 | rootfs->path, rootfs->mount, |
1362 | rootfs->options ? rootfs->options : "(null)"); | |
c3f0a28c | 1363 | return -1; |
1364 | } | |
0ad19a3f | 1365 | |
0fd73091 | 1366 | DEBUG("Mounted rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1367 | rootfs->path, rootfs->mount, |
1368 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1369 | |
ac778708 DL |
1370 | return 0; |
1371 | } | |
1372 | ||
8ce1abc2 | 1373 | int lxc_chroot(const struct lxc_rootfs *rootfs) |
91e93c71 | 1374 | { |
0fd73091 CB |
1375 | int i, ret; |
1376 | char *p, *p2; | |
1377 | char buf[LXC_LINELEN], nroot[PATH_MAX]; | |
91e93c71 | 1378 | FILE *f; |
8ce1abc2 | 1379 | char *root = rootfs->mount; |
91e93c71 | 1380 | |
8ce1abc2 CB |
1381 | if (!realpath(root, nroot)) { |
1382 | SYSERROR("Failed to resolve \"%s\"", root); | |
0fd73091 | 1383 | return -1; |
8ce1abc2 | 1384 | } |
91e93c71 | 1385 | |
0fd73091 CB |
1386 | ret = chdir("/"); |
1387 | if (ret < 0) | |
1388 | return -1; | |
91e93c71 | 1389 | |
0fd73091 CB |
1390 | /* We could use here MS_MOVE, but in userns this mount is locked and |
1391 | * can't be moved. | |
91e93c71 | 1392 | */ |
8ce1abc2 | 1393 | ret = mount(nroot, "/", NULL, MS_REC | MS_BIND, NULL); |
0fd73091 | 1394 | if (ret < 0) { |
8ce1abc2 | 1395 | SYSERROR("Failed to mount \"%s\" onto \"/\" as MS_REC | MS_BIND", nroot); |
0fd73091 | 1396 | return -1; |
91e93c71 AV |
1397 | } |
1398 | ||
0fd73091 CB |
1399 | ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL); |
1400 | if (ret < 0) { | |
8ce1abc2 | 1401 | SYSERROR("Failed to remount \"/\""); |
0fd73091 | 1402 | return -1; |
91e93c71 AV |
1403 | } |
1404 | ||
0fd73091 CB |
1405 | /* The following code cleans up inhereted mounts which are not required |
1406 | * for CT. | |
91e93c71 AV |
1407 | * |
1408 | * The mountinfo file shows not all mounts, if a few points have been | |
1409 | * unmounted between read operations from the mountinfo. So we need to | |
1410 | * read mountinfo a few times. | |
1411 | * | |
1412 | * This loop can be skipped if a container uses unserns, because all | |
1413 | * inherited mounts are locked and we should live with all this trash. | |
1414 | */ | |
0fd73091 | 1415 | for (;;) { |
91e93c71 AV |
1416 | int progress = 0; |
1417 | ||
1418 | f = fopen("./proc/self/mountinfo", "r"); | |
1419 | if (!f) { | |
8ce1abc2 | 1420 | SYSERROR("Failed to open \"/proc/self/mountinfo\""); |
91e93c71 AV |
1421 | return -1; |
1422 | } | |
0fd73091 | 1423 | |
eab15c1e | 1424 | while (fgets(buf, LXC_LINELEN, f)) { |
91e93c71 AV |
1425 | for (p = buf, i=0; p && i < 4; i++) |
1426 | p = strchr(p+1, ' '); | |
0fd73091 | 1427 | |
91e93c71 AV |
1428 | if (!p) |
1429 | continue; | |
0fd73091 | 1430 | |
91e93c71 AV |
1431 | p2 = strchr(p+1, ' '); |
1432 | if (!p2) | |
1433 | continue; | |
1434 | ||
1435 | *p2 = '\0'; | |
1436 | *p = '.'; | |
1437 | ||
1438 | if (strcmp(p + 1, "/") == 0) | |
1439 | continue; | |
0fd73091 | 1440 | |
91e93c71 AV |
1441 | if (strcmp(p + 1, "/proc") == 0) |
1442 | continue; | |
1443 | ||
0fd73091 CB |
1444 | ret = umount2(p, MNT_DETACH); |
1445 | if (ret == 0) | |
91e93c71 AV |
1446 | progress++; |
1447 | } | |
0fd73091 | 1448 | |
91e93c71 | 1449 | fclose(f); |
0fd73091 | 1450 | |
91e93c71 AV |
1451 | if (!progress) |
1452 | break; | |
1453 | } | |
1454 | ||
0fd73091 CB |
1455 | /* This also can be skipped if a container uses unserns. */ |
1456 | (void)umount2("./proc", MNT_DETACH); | |
91e93c71 AV |
1457 | |
1458 | /* It is weird, but chdir("..") moves us in a new root */ | |
0fd73091 CB |
1459 | ret = chdir(".."); |
1460 | if (ret < 0) { | |
8ce1abc2 | 1461 | SYSERROR("Failed to chdir(\"..\")"); |
91e93c71 AV |
1462 | return -1; |
1463 | } | |
1464 | ||
0fd73091 CB |
1465 | ret = chroot("."); |
1466 | if (ret < 0) { | |
8ce1abc2 | 1467 | SYSERROR("Failed to chroot(\".\")"); |
91e93c71 AV |
1468 | return -1; |
1469 | } | |
1470 | ||
1471 | return 0; | |
1472 | } | |
1473 | ||
8ce1abc2 CB |
1474 | /* (The following explanation is copied verbatim from the kernel.) |
1475 | * | |
1476 | * pivot_root Semantics: | |
1477 | * Moves the root file system of the current process to the directory put_old, | |
1478 | * makes new_root as the new root file system of the current process, and sets | |
1479 | * root/cwd of all processes which had them on the current root to new_root. | |
1480 | * | |
1481 | * Restrictions: | |
1482 | * The new_root and put_old must be directories, and must not be on the | |
1483 | * same file system as the current process root. The put_old must be | |
1484 | * underneath new_root, i.e. adding a non-zero number of /.. to the string | |
1485 | * pointed to by put_old must yield the same directory as new_root. No other | |
1486 | * file system may be mounted on put_old. After all, new_root is a mountpoint. | |
1487 | * | |
1488 | * Also, the current root cannot be on the 'rootfs' (initial ramfs) filesystem. | |
1489 | * See Documentation/filesystems/ramfs-rootfs-initramfs.txt for alternatives | |
1490 | * in this situation. | |
1491 | * | |
1492 | * Notes: | |
1493 | * - we don't move root/cwd if they are not at the root (reason: if something | |
1494 | * cared enough to change them, it's probably wrong to force them elsewhere) | |
1495 | * - it's okay to pick a root that isn't the root of a file system, e.g. | |
1496 | * /nfs/my_root where /nfs is the mount point. It must be a mountpoint, | |
1497 | * though, so you may need to say mount --bind /nfs/my_root /nfs/my_root | |
1498 | * first. | |
1499 | */ | |
1500 | static int lxc_pivot_root(const char *rootfs) | |
ac778708 | 1501 | { |
8ce1abc2 | 1502 | int newroot = -1, oldroot = -1, ret = -1; |
0fd73091 | 1503 | |
8ce1abc2 CB |
1504 | oldroot = open("/", O_DIRECTORY | O_RDONLY); |
1505 | if (oldroot < 0) { | |
1506 | SYSERROR("Failed to open old root directory"); | |
1507 | return -1; | |
39c7b795 | 1508 | } |
ac778708 | 1509 | |
8ce1abc2 CB |
1510 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY); |
1511 | if (newroot < 0) { | |
1512 | SYSERROR("Failed to open new root directory"); | |
1513 | goto on_error; | |
1514 | } | |
0fd73091 | 1515 | |
8ce1abc2 CB |
1516 | /* change into new root fs */ |
1517 | ret = fchdir(newroot); | |
1518 | if (ret < 0) { | |
1519 | ret = -1; | |
1520 | SYSERROR("Failed to change to new rootfs \"%s\"", rootfs); | |
1521 | goto on_error; | |
1522 | } | |
39c7b795 | 1523 | |
8ce1abc2 CB |
1524 | /* pivot_root into our new root fs */ |
1525 | ret = pivot_root(".", "."); | |
1526 | if (ret < 0) { | |
1527 | ret = -1; | |
1528 | SYSERROR("Failed to pivot_root()"); | |
1529 | goto on_error; | |
39c7b795 CB |
1530 | } |
1531 | ||
8ce1abc2 CB |
1532 | /* At this point the old-root is mounted on top of our new-root. To |
1533 | * unmounted it we must not be chdir'd into it, so escape back to | |
1534 | * old-root. | |
1535 | */ | |
1536 | ret = fchdir(oldroot); | |
0fd73091 | 1537 | if (ret < 0) { |
8ce1abc2 CB |
1538 | ret = -1; |
1539 | SYSERROR("Failed to enter old root directory"); | |
1540 | goto on_error; | |
c69bd12f DL |
1541 | } |
1542 | ||
8ce1abc2 CB |
1543 | /* Make oldroot rslave to make sure our umounts don't propagate to the |
1544 | * host. | |
1545 | */ | |
1546 | ret = mount("", ".", "", MS_SLAVE | MS_REC, NULL); | |
1547 | if (ret < 0) { | |
1548 | ret = -1; | |
1549 | SYSERROR("Failed to make oldroot rslave"); | |
1550 | goto on_error; | |
1551 | } | |
1552 | ||
1553 | ret = umount2(".", MNT_DETACH); | |
1554 | if (ret < 0) { | |
1555 | ret = -1; | |
1556 | SYSERROR("Failed to detach old root directory"); | |
1557 | goto on_error; | |
1558 | } | |
1559 | ||
1560 | ret = fchdir(newroot); | |
1561 | if (ret < 0) { | |
1562 | ret = -1; | |
1563 | SYSERROR("Failed to re-enter new root directory"); | |
1564 | goto on_error; | |
1565 | } | |
1566 | ||
1567 | ret = 0; | |
1568 | ||
1569 | TRACE("pivot_root(\"%s\") successful", rootfs); | |
1570 | ||
1571 | on_error: | |
1572 | if (oldroot != -1) | |
1573 | close(oldroot); | |
1574 | if (newroot != -1) | |
1575 | close(newroot); | |
1576 | ||
1577 | return ret; | |
0ad19a3f | 1578 | } |
1579 | ||
8ce1abc2 CB |
1580 | static int lxc_setup_rootfs_switch_root(const struct lxc_rootfs *rootfs) |
1581 | { | |
1582 | if (!rootfs->path) { | |
1583 | DEBUG("Container does not have a rootfs"); | |
1584 | return 0; | |
1585 | } | |
1586 | ||
1587 | if (detect_ramfs_rootfs()) | |
1588 | return lxc_chroot(rootfs); | |
1589 | ||
1590 | return lxc_pivot_root(rootfs->mount); | |
0ad19a3f | 1591 | } |
1592 | ||
8ce1abc2 CB |
1593 | static const struct id_map *find_mapped_nsid_entry(struct lxc_conf *conf, |
1594 | unsigned id, | |
1595 | enum idtype idtype) | |
f4900711 CB |
1596 | { |
1597 | struct lxc_list *it; | |
1598 | struct id_map *map; | |
1599 | struct id_map *retmap = NULL; | |
1600 | ||
dcf0ffdf CB |
1601 | /* Shortcut for container's root mappings. */ |
1602 | if (id == 0) { | |
1603 | if (idtype == ID_TYPE_UID) | |
1604 | return conf->root_nsuid_map; | |
1605 | ||
1606 | if (idtype == ID_TYPE_GID) | |
1607 | return conf->root_nsgid_map; | |
1608 | } | |
1609 | ||
f4900711 CB |
1610 | lxc_list_for_each(it, &conf->id_map) { |
1611 | map = it->elem; | |
1612 | if (map->idtype != idtype) | |
1613 | continue; | |
1614 | ||
1615 | if (id >= map->nsid && id < map->nsid + map->range) { | |
1616 | retmap = map; | |
1617 | break; | |
1618 | } | |
1619 | } | |
1620 | ||
1621 | return retmap; | |
1622 | } | |
1623 | ||
1624 | static int lxc_setup_devpts(struct lxc_conf *conf) | |
3c26f34e | 1625 | { |
70761e5e | 1626 | int ret; |
dfbd4730 | 1627 | char default_devpts_mntopts[] = "gid=5,newinstance,ptmxmode=0666,mode=0620"; |
9d28c4f9 | 1628 | char devpts_mntopts[256]; |
77890c6d | 1629 | |
e528c735 | 1630 | if (conf->pty_max <= 0) { |
0fd73091 | 1631 | DEBUG("No new devpts instance will be mounted since no pts " |
70761e5e | 1632 | "devices are requested"); |
d852c78c | 1633 | return 0; |
3c26f34e | 1634 | } |
1635 | ||
e528c735 CB |
1636 | ret = snprintf(devpts_mntopts, sizeof(devpts_mntopts), "%s,max=%zu", |
1637 | default_devpts_mntopts, conf->pty_max); | |
9d28c4f9 CB |
1638 | if (ret < 0 || (size_t)ret >= sizeof(devpts_mntopts)) |
1639 | return -1; | |
1640 | ||
77f94854 CB |
1641 | ret = umount2("/dev/pts", MNT_DETACH); |
1642 | if (ret < 0) | |
a24c5678 | 1643 | SYSWARN("Failed to unmount old devpts instance"); |
77f94854 | 1644 | else |
0fd73091 | 1645 | DEBUG("Unmounted old devpts instance"); |
7e40254a | 1646 | |
70761e5e CB |
1647 | /* Create mountpoint for devpts instance. */ |
1648 | ret = mkdir("/dev/pts", 0755); | |
1649 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1650 | SYSERROR("Failed to create \"/dev/pts\" directory"); |
3c26f34e | 1651 | return -1; |
1652 | } | |
1653 | ||
11293068 | 1654 | /* mount new devpts instance */ |
f4900711 | 1655 | ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, devpts_mntopts); |
70761e5e | 1656 | if (ret < 0) { |
dfbd4730 CB |
1657 | /* try mounting without "max" */ |
1658 | if (errno == EINVAL) { | |
1659 | devpts_mntopts[sizeof(default_devpts_mntopts) - 1] = '\0'; | |
1660 | ret = mount("devpts", "/dev/pts", "devpts", | |
1661 | MS_NOSUID | MS_NOEXEC, devpts_mntopts); | |
1662 | if (ret < 0) { | |
1663 | SYSERROR("Failed to mount new devpts instance"); | |
1664 | return -1; | |
1665 | } | |
1666 | } | |
1667 | ||
11293068 | 1668 | /* try mounting without gid=5 */ |
dfbd4730 CB |
1669 | ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, |
1670 | devpts_mntopts + sizeof("gid=5")); | |
11293068 CB |
1671 | if (ret < 0) { |
1672 | SYSERROR("Failed to mount new devpts instance"); | |
1673 | return -1; | |
1674 | } | |
70761e5e | 1675 | } |
0fd73091 | 1676 | DEBUG("Mount new devpts instance with options \"%s\"", devpts_mntopts); |
70761e5e | 1677 | |
d5cb35d6 | 1678 | /* Remove any pre-existing /dev/ptmx file. */ |
b29e05d6 CB |
1679 | ret = remove("/dev/ptmx"); |
1680 | if (ret < 0) { | |
1681 | if (errno != ENOENT) { | |
0fd73091 | 1682 | SYSERROR("Failed to remove existing \"/dev/ptmx\" file"); |
d5cb35d6 | 1683 | return -1; |
70761e5e | 1684 | } |
b29e05d6 | 1685 | } else { |
0fd73091 | 1686 | DEBUG("Removed existing \"/dev/ptmx\" file"); |
3c26f34e | 1687 | } |
1688 | ||
d5cb35d6 | 1689 | /* Create dummy /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
3b7e332f CB |
1690 | ret = mknod("/dev/ptmx", S_IFREG | 0000, 0); |
1691 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1692 | SYSERROR("Failed to create dummy \"/dev/ptmx\" file as bind mount target"); |
d5cb35d6 CB |
1693 | return -1; |
1694 | } | |
0fd73091 | 1695 | DEBUG("Created dummy \"/dev/ptmx\" file as bind mount target"); |
77890c6d | 1696 | |
d5cb35d6 | 1697 | /* Fallback option: create symlink /dev/ptmx -> /dev/pts/ptmx */ |
e87bd19c | 1698 | ret = mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL); |
d5cb35d6 | 1699 | if (!ret) { |
0fd73091 | 1700 | DEBUG("Bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1701 | return 0; |
1702 | } else { | |
1703 | /* Fallthrough and try to create a symlink. */ | |
0fd73091 | 1704 | ERROR("Failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1705 | } |
1706 | ||
1707 | /* Remove the dummy /dev/ptmx file we created above. */ | |
1708 | ret = remove("/dev/ptmx"); | |
70761e5e | 1709 | if (ret < 0) { |
0fd73091 | 1710 | SYSERROR("Failed to remove existing \"/dev/ptmx\""); |
d5cb35d6 CB |
1711 | return -1; |
1712 | } | |
1713 | ||
1714 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
1715 | ret = symlink("/dev/pts/ptmx", "/dev/ptmx"); | |
1716 | if (ret < 0) { | |
0fd73091 | 1717 | SYSERROR("Failed to create symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
3c26f34e | 1718 | return -1; |
1719 | } | |
0fd73091 | 1720 | DEBUG("Created symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
cd54d859 | 1721 | |
3c26f34e | 1722 | return 0; |
1723 | } | |
1724 | ||
cccc74b5 DL |
1725 | static int setup_personality(int persona) |
1726 | { | |
0fd73091 CB |
1727 | int ret; |
1728 | ||
1729 | #if HAVE_SYS_PERSONALITY_H | |
cccc74b5 DL |
1730 | if (persona == -1) |
1731 | return 0; | |
1732 | ||
0fd73091 CB |
1733 | ret = personality(persona); |
1734 | if (ret < 0) { | |
1735 | SYSERROR("Failed to set personality to \"0x%x\"", persona); | |
cccc74b5 DL |
1736 | return -1; |
1737 | } | |
1738 | ||
0fd73091 CB |
1739 | INFO("Set personality to \"0x%x\"", persona); |
1740 | #endif | |
cccc74b5 DL |
1741 | |
1742 | return 0; | |
1743 | } | |
1744 | ||
3d7d929a | 1745 | static int lxc_setup_dev_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1746 | const struct lxc_terminal *console) |
6e590161 | 1747 | { |
882671aa | 1748 | int ret; |
63376d7d | 1749 | char path[MAXPATHLEN]; |
86530b0a | 1750 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
52e35957 | 1751 | |
8b1b1210 CB |
1752 | if (console->path && !strcmp(console->path, "none")) |
1753 | return 0; | |
1754 | ||
86530b0a | 1755 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3d7d929a | 1756 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1757 | return -1; |
52e35957 | 1758 | |
8b1b1210 CB |
1759 | /* When we are asked to setup a console we remove any previous |
1760 | * /dev/console bind-mounts. | |
1761 | */ | |
a7ba3c7f CB |
1762 | if (file_exists(path)) { |
1763 | ret = lxc_unstack_mountpoint(path, false); | |
1764 | if (ret < 0) { | |
6d1400b5 | 1765 | SYSERROR("Failed to unmount \"%s\"", path); |
a7ba3c7f CB |
1766 | return -ret; |
1767 | } else { | |
86530b0a | 1768 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1769 | } |
8b1b1210 CB |
1770 | } |
1771 | ||
1772 | /* For unprivileged containers autodev or automounts will already have | |
1773 | * taken care of creating /dev/console. | |
1774 | */ | |
882671aa | 1775 | ret = mknod(path, S_IFREG | 0000, 0); |
3b7e332f CB |
1776 | if (ret < 0 && errno != EEXIST) { |
1777 | SYSERROR("Failed to create console"); | |
1778 | return -errno; | |
52e35957 DL |
1779 | } |
1780 | ||
882671aa | 1781 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP | S_IXOTH); |
86530b0a | 1782 | if (ret < 0) { |
0fd73091 CB |
1783 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
1784 | S_IXUSR | S_IXGRP | S_IXOTH, console->name); | |
3d7d929a | 1785 | return -errno; |
63376d7d | 1786 | } |
13954cce | 1787 | |
86530b0a L |
1788 | ret = safe_mount(console->name, path, "none", MS_BIND, 0, rootfs_path); |
1789 | if (ret < 0) { | |
0fd73091 | 1790 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, path); |
6e590161 | 1791 | return -1; |
1792 | } | |
1793 | ||
86530b0a | 1794 | DEBUG("Mounted pts device \"%s\" onto \"%s\"", console->name, path); |
7c6ef2a2 SH |
1795 | return 0; |
1796 | } | |
1797 | ||
3d7d929a | 1798 | static int lxc_setup_ttydir_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1799 | const struct lxc_terminal *console, |
3d7d929a | 1800 | char *ttydir) |
7c6ef2a2 | 1801 | { |
3b7e332f | 1802 | int ret; |
3d7d929a | 1803 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
86530b0a | 1804 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
7c6ef2a2 | 1805 | |
3dc035f1 L |
1806 | if (console->path && !strcmp(console->path, "none")) |
1807 | return 0; | |
1808 | ||
7c6ef2a2 | 1809 | /* create rootfs/dev/<ttydir> directory */ |
86530b0a | 1810 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs_path, ttydir); |
3d7d929a | 1811 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1812 | return -1; |
3d7d929a | 1813 | |
7c6ef2a2 SH |
1814 | ret = mkdir(path, 0755); |
1815 | if (ret && errno != EEXIST) { | |
0fd73091 | 1816 | SYSERROR("Failed to create \"%s\"", path); |
3d7d929a | 1817 | return -errno; |
7c6ef2a2 | 1818 | } |
4742cd9a | 1819 | DEBUG("Created directory for console and tty devices at \"%s\"", path); |
7c6ef2a2 | 1820 | |
86530b0a | 1821 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", rootfs_path, ttydir); |
3d7d929a CB |
1822 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
1823 | return -1; | |
1824 | ||
3b7e332f CB |
1825 | ret = mknod(lxcpath, S_IFREG | 0000, 0); |
1826 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1827 | SYSERROR("Failed to create \"%s\"", lxcpath); |
3d7d929a | 1828 | return -errno; |
7c6ef2a2 | 1829 | } |
7c6ef2a2 | 1830 | |
86530b0a | 1831 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3dc035f1 | 1832 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1833 | return -1; |
2a12fefd | 1834 | |
3dc035f1 | 1835 | if (file_exists(path)) { |
a7ba3c7f | 1836 | ret = lxc_unstack_mountpoint(path, false); |
2a12fefd | 1837 | if (ret < 0) { |
6d1400b5 | 1838 | SYSERROR("Failed to unmount \"%s\"", path); |
a7ba3c7f CB |
1839 | return -ret; |
1840 | } else { | |
86530b0a | 1841 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1842 | } |
3dc035f1 | 1843 | } |
2a12fefd | 1844 | |
3b7e332f CB |
1845 | ret = mknod(path, S_IFREG | 0000, 0); |
1846 | if (ret < 0 && errno != EEXIST) { | |
1847 | SYSERROR("Failed to create console"); | |
1848 | return -errno; | |
7c6ef2a2 SH |
1849 | } |
1850 | ||
3b7e332f | 1851 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP | S_IXOTH); |
86530b0a | 1852 | if (ret < 0) { |
0fd73091 CB |
1853 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
1854 | S_IXUSR | S_IXGRP | S_IXOTH, console->name); | |
2a12fefd CB |
1855 | return -errno; |
1856 | } | |
1857 | ||
3dc035f1 | 1858 | /* bind mount console->name to '/dev/<ttydir>/console' */ |
86530b0a L |
1859 | ret = safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs_path); |
1860 | if (ret < 0) { | |
0fd73091 | 1861 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
7c6ef2a2 SH |
1862 | return -1; |
1863 | } | |
86530b0a | 1864 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1865 | |
1866 | /* bind mount '/dev/<ttydir>/console' to '/dev/console' */ | |
86530b0a L |
1867 | ret = safe_mount(lxcpath, path, "none", MS_BIND, 0, rootfs_path); |
1868 | if (ret < 0) { | |
0fd73091 | 1869 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1870 | return -1; |
1871 | } | |
86530b0a | 1872 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 | 1873 | |
86530b0a | 1874 | DEBUG("Console has been setup under \"%s\" and mounted to \"%s\"", lxcpath, path); |
6e590161 | 1875 | return 0; |
1876 | } | |
1877 | ||
3d7d929a | 1878 | static int lxc_setup_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1879 | const struct lxc_terminal *console, char *ttydir) |
7c6ef2a2 | 1880 | { |
3d7d929a | 1881 | |
7c6ef2a2 | 1882 | if (!ttydir) |
3d7d929a | 1883 | return lxc_setup_dev_console(rootfs, console); |
7c6ef2a2 | 1884 | |
3d7d929a | 1885 | return lxc_setup_ttydir_console(rootfs, console, ttydir); |
7c6ef2a2 SH |
1886 | } |
1887 | ||
efed99a4 | 1888 | static void parse_mntopt(char *opt, unsigned long *flags, char **data, size_t size) |
998ac676 RT |
1889 | { |
1890 | struct mount_opt *mo; | |
1891 | ||
1892 | /* If opt is found in mount_opt, set or clear flags. | |
1893 | * Otherwise append it to data. */ | |
1894 | ||
1895 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
0fd73091 | 1896 | if (strncmp(opt, mo->name, strlen(mo->name)) == 0) { |
998ac676 RT |
1897 | if (mo->clear) |
1898 | *flags &= ~mo->flag; | |
1899 | else | |
1900 | *flags |= mo->flag; | |
1901 | return; | |
1902 | } | |
1903 | } | |
1904 | ||
f1e05b90 DJ |
1905 | if (strlen(*data)) |
1906 | (void)strlcat(*data, ",", size); | |
efed99a4 | 1907 | |
f1e05b90 | 1908 | (void)strlcat(*data, opt, size); |
998ac676 RT |
1909 | } |
1910 | ||
0fd73091 | 1911 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, char **mntdata) |
998ac676 | 1912 | { |
0fd73091 | 1913 | char *data, *p, *s; |
efed99a4 | 1914 | size_t size; |
998ac676 | 1915 | |
911324ef | 1916 | *mntdata = NULL; |
91656ce5 | 1917 | *mntflags = 0L; |
911324ef DL |
1918 | |
1919 | if (!mntopts) | |
998ac676 RT |
1920 | return 0; |
1921 | ||
911324ef | 1922 | s = strdup(mntopts); |
0fd73091 | 1923 | if (!s) |
998ac676 | 1924 | return -1; |
998ac676 | 1925 | |
efed99a4 DJ |
1926 | size = strlen(s) + 1; |
1927 | data = malloc(size); | |
998ac676 | 1928 | if (!data) { |
998ac676 RT |
1929 | free(s); |
1930 | return -1; | |
1931 | } | |
1932 | *data = 0; | |
1933 | ||
8db9d26f | 1934 | lxc_iterate_parts(p, s, ",") |
efed99a4 | 1935 | parse_mntopt(p, mntflags, &data, size); |
998ac676 RT |
1936 | |
1937 | if (*data) | |
1938 | *mntdata = data; | |
1939 | else | |
1940 | free(data); | |
1941 | free(s); | |
1942 | ||
1943 | return 0; | |
1944 | } | |
1945 | ||
d840039e YT |
1946 | static void parse_propagationopt(char *opt, unsigned long *flags) |
1947 | { | |
1948 | struct mount_opt *mo; | |
1949 | ||
1950 | /* If opt is found in propagation_opt, set or clear flags. */ | |
d840039e | 1951 | for (mo = &propagation_opt[0]; mo->name != NULL; mo++) { |
0fd73091 CB |
1952 | if (strncmp(opt, mo->name, strlen(mo->name)) != 0) |
1953 | continue; | |
1954 | ||
1955 | if (mo->clear) | |
1956 | *flags &= ~mo->flag; | |
1957 | else | |
1958 | *flags |= mo->flag; | |
1959 | ||
1960 | return; | |
d840039e YT |
1961 | } |
1962 | } | |
1963 | ||
8ce1abc2 | 1964 | int parse_propagationopts(const char *mntopts, unsigned long *pflags) |
d840039e | 1965 | { |
0fd73091 | 1966 | char *p, *s; |
d840039e YT |
1967 | |
1968 | if (!mntopts) | |
1969 | return 0; | |
1970 | ||
1971 | s = strdup(mntopts); | |
1972 | if (!s) { | |
1973 | SYSERROR("Failed to allocate memory"); | |
1974 | return -ENOMEM; | |
1975 | } | |
1976 | ||
0fd73091 | 1977 | *pflags = 0L; |
8db9d26f | 1978 | lxc_iterate_parts(p, s, ",") |
d840039e | 1979 | parse_propagationopt(p, pflags); |
d840039e | 1980 | free(s); |
0fd73091 | 1981 | |
d840039e YT |
1982 | return 0; |
1983 | } | |
1984 | ||
6fd5e769 SH |
1985 | static void null_endofword(char *word) |
1986 | { | |
1987 | while (*word && *word != ' ' && *word != '\t') | |
1988 | word++; | |
1989 | *word = '\0'; | |
1990 | } | |
1991 | ||
0fd73091 | 1992 | /* skip @nfields spaces in @src */ |
6fd5e769 SH |
1993 | static char *get_field(char *src, int nfields) |
1994 | { | |
6fd5e769 | 1995 | int i; |
0fd73091 | 1996 | char *p = src; |
6fd5e769 SH |
1997 | |
1998 | for (i = 0; i < nfields; i++) { | |
1999 | while (*p && *p != ' ' && *p != '\t') | |
2000 | p++; | |
0fd73091 | 2001 | |
6fd5e769 SH |
2002 | if (!*p) |
2003 | break; | |
0fd73091 | 2004 | |
6fd5e769 SH |
2005 | p++; |
2006 | } | |
0fd73091 | 2007 | |
6fd5e769 SH |
2008 | return p; |
2009 | } | |
2010 | ||
911324ef DL |
2011 | static int mount_entry(const char *fsname, const char *target, |
2012 | const char *fstype, unsigned long mountflags, | |
d840039e YT |
2013 | unsigned long pflags, const char *data, bool optional, |
2014 | bool dev, bool relative, const char *rootfs) | |
911324ef | 2015 | { |
0ac4b28a | 2016 | int ret; |
181437fd YT |
2017 | char srcbuf[MAXPATHLEN]; |
2018 | const char *srcpath = fsname; | |
614305f3 | 2019 | #ifdef HAVE_STATVFS |
2938f7c8 | 2020 | struct statvfs sb; |
614305f3 | 2021 | #endif |
2938f7c8 | 2022 | |
181437fd YT |
2023 | if (relative) { |
2024 | ret = snprintf(srcbuf, MAXPATHLEN, "%s/%s", rootfs ? rootfs : "/", fsname ? fsname : ""); | |
2025 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2026 | ERROR("source path is too long"); | |
2027 | return -1; | |
2028 | } | |
2029 | srcpath = srcbuf; | |
2030 | } | |
2031 | ||
2032 | ret = safe_mount(srcpath, target, fstype, mountflags & ~MS_REMOUNT, data, | |
0ac4b28a CB |
2033 | rootfs); |
2034 | if (ret < 0) { | |
1fc64d22 | 2035 | if (optional) { |
7874d81a | 2036 | SYSINFO("Failed to mount \"%s\" on \"%s\" (optional)", |
2037 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
2038 | return 0; |
2039 | } | |
0ac4b28a | 2040 | |
0103eb53 | 2041 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2042 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2043 | return -1; |
911324ef DL |
2044 | } |
2045 | ||
2046 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
7c5b6e7c | 2047 | unsigned long rqd_flags = 0; |
0ac4b28a CB |
2048 | |
2049 | DEBUG("Remounting \"%s\" on \"%s\" to respect bind or remount " | |
181437fd | 2050 | "options", srcpath ? srcpath : "(none)", target ? target : "(none)"); |
0ac4b28a | 2051 | |
7c5b6e7c AS |
2052 | if (mountflags & MS_RDONLY) |
2053 | rqd_flags |= MS_RDONLY; | |
614305f3 | 2054 | #ifdef HAVE_STATVFS |
181437fd | 2055 | if (srcpath && statvfs(srcpath, &sb) == 0) { |
7c5b6e7c | 2056 | unsigned long required_flags = rqd_flags; |
0ac4b28a | 2057 | |
2938f7c8 SH |
2058 | if (sb.f_flag & MS_NOSUID) |
2059 | required_flags |= MS_NOSUID; | |
0ac4b28a | 2060 | |
ae7a770e | 2061 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 | 2062 | required_flags |= MS_NODEV; |
0ac4b28a | 2063 | |
2938f7c8 SH |
2064 | if (sb.f_flag & MS_RDONLY) |
2065 | required_flags |= MS_RDONLY; | |
0ac4b28a | 2066 | |
2938f7c8 SH |
2067 | if (sb.f_flag & MS_NOEXEC) |
2068 | required_flags |= MS_NOEXEC; | |
0ac4b28a CB |
2069 | |
2070 | DEBUG("Flags for \"%s\" were %lu, required extra flags " | |
181437fd | 2071 | "are %lu", srcpath, sb.f_flag, required_flags); |
0ac4b28a CB |
2072 | |
2073 | /* If this was a bind mount request, and required_flags | |
2938f7c8 | 2074 | * does not have any flags which are not already in |
0ac4b28a | 2075 | * mountflags, then skip the remount. |
2938f7c8 SH |
2076 | */ |
2077 | if (!(mountflags & MS_REMOUNT)) { | |
0ac4b28a CB |
2078 | if (!(required_flags & ~mountflags) && |
2079 | rqd_flags == 0) { | |
2080 | DEBUG("Mountflags already were %lu, " | |
2081 | "skipping remount", mountflags); | |
2938f7c8 SH |
2082 | goto skipremount; |
2083 | } | |
2084 | } | |
0ac4b28a | 2085 | |
2938f7c8 | 2086 | mountflags |= required_flags; |
6fd5e769 | 2087 | } |
614305f3 | 2088 | #endif |
911324ef | 2089 | |
181437fd | 2090 | ret = mount(srcpath, target, fstype, mountflags | MS_REMOUNT, data); |
0ac4b28a | 2091 | if (ret < 0) { |
1fc64d22 | 2092 | if (optional) { |
7874d81a | 2093 | SYSINFO("Failed to mount \"%s\" on \"%s\" (optional)", |
2094 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
2095 | return 0; |
2096 | } | |
0ac4b28a | 2097 | |
0103eb53 | 2098 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2099 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2100 | return -1; |
911324ef DL |
2101 | } |
2102 | } | |
2103 | ||
d840039e YT |
2104 | if (pflags) { |
2105 | ret = mount(NULL, target, NULL, pflags, NULL); | |
2106 | if (ret < 0) { | |
2107 | if (optional) { | |
7874d81a | 2108 | SYSINFO("Failed to change mount propagation " |
2109 | "for \"%s\" (optional)", target); | |
d840039e YT |
2110 | return 0; |
2111 | } else { | |
2112 | SYSERROR("Failed to change mount propagation " | |
2113 | "for \"%s\" (optional)", target); | |
2114 | return -1; | |
2115 | } | |
2116 | } | |
2117 | DEBUG("Changed mount propagation for \"%s\"", target); | |
2118 | } | |
2119 | ||
2120 | ||
614305f3 | 2121 | #ifdef HAVE_STATVFS |
6fd5e769 | 2122 | skipremount: |
614305f3 | 2123 | #endif |
0103eb53 | 2124 | DEBUG("Mounted \"%s\" on \"%s\" with filesystem type \"%s\"", |
181437fd | 2125 | srcpath ? srcpath : "(null)", target, fstype); |
911324ef DL |
2126 | |
2127 | return 0; | |
2128 | } | |
2129 | ||
c5e30de4 | 2130 | /* Remove "optional", "create=dir", and "create=file" from mntopt */ |
4e4ca161 SH |
2131 | static void cull_mntent_opt(struct mntent *mntent) |
2132 | { | |
2133 | int i; | |
0fd73091 CB |
2134 | char *list[] = { |
2135 | "create=dir", | |
2136 | "create=file", | |
2137 | "optional", | |
2138 | "relative", | |
2139 | NULL | |
2140 | }; | |
c5e30de4 CB |
2141 | |
2142 | for (i = 0; list[i]; i++) { | |
2143 | char *p, *p2; | |
2144 | ||
2145 | p = strstr(mntent->mnt_opts, list[i]); | |
2146 | if (!p) | |
4e4ca161 | 2147 | continue; |
c5e30de4 | 2148 | |
4e4ca161 SH |
2149 | p2 = strchr(p, ','); |
2150 | if (!p2) { | |
2151 | /* no more mntopts, so just chop it here */ | |
2152 | *p = '\0'; | |
2153 | continue; | |
2154 | } | |
c5e30de4 CB |
2155 | |
2156 | memmove(p, p2 + 1, strlen(p2 + 1) + 1); | |
4e4ca161 SH |
2157 | } |
2158 | } | |
2159 | ||
4d5b72a1 | 2160 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
749f98d9 CB |
2161 | const char *path, |
2162 | const struct lxc_rootfs *rootfs, | |
0fd73091 | 2163 | const char *lxc_name, const char *lxc_path) |
0ad19a3f | 2164 | { |
3b7e332f | 2165 | int ret; |
12e6ab5d | 2166 | char *p1, *p2; |
911324ef | 2167 | |
12e6ab5d | 2168 | if (strncmp(mntent->mnt_type, "overlay", 7) == 0) { |
749f98d9 | 2169 | ret = ovl_mkdir(mntent, rootfs, lxc_name, lxc_path); |
12e6ab5d CB |
2170 | if (ret < 0) |
2171 | return -1; | |
2172 | } | |
6e46cc0d | 2173 | |
34cfffb3 | 2174 | if (hasmntopt(mntent, "create=dir")) { |
749f98d9 CB |
2175 | ret = mkdir_p(path, 0755); |
2176 | if (ret < 0 && errno != EEXIST) { | |
2177 | SYSERROR("Failed to create directory \"%s\"", path); | |
2178 | return -1; | |
34cfffb3 SG |
2179 | } |
2180 | } | |
2181 | ||
0fd73091 CB |
2182 | if (!hasmntopt(mntent, "create=file")) |
2183 | return 0; | |
749f98d9 | 2184 | |
0fd73091 CB |
2185 | ret = access(path, F_OK); |
2186 | if (ret == 0) | |
2187 | return 0; | |
749f98d9 | 2188 | |
0fd73091 CB |
2189 | p1 = strdup(path); |
2190 | if (!p1) | |
2191 | return -1; | |
749f98d9 | 2192 | |
0fd73091 | 2193 | p2 = dirname(p1); |
749f98d9 | 2194 | |
0fd73091 CB |
2195 | ret = mkdir_p(p2, 0755); |
2196 | free(p1); | |
2197 | if (ret < 0 && errno != EEXIST) { | |
2198 | SYSERROR("Failed to create directory \"%s\"", path); | |
2199 | return -1; | |
34cfffb3 | 2200 | } |
749f98d9 | 2201 | |
3b7e332f CB |
2202 | ret = mknod(path, S_IFREG | 0000, 0); |
2203 | if (ret < 0 && errno != EEXIST) | |
2204 | return -errno; | |
0fd73091 | 2205 | |
749f98d9 | 2206 | return 0; |
4d5b72a1 NC |
2207 | } |
2208 | ||
ec50007f CB |
2209 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
2210 | * without a rootfs. */ | |
db4aba38 | 2211 | static inline int mount_entry_on_generic(struct mntent *mntent, |
d8b712bc CB |
2212 | const char *path, |
2213 | const struct lxc_rootfs *rootfs, | |
2214 | const char *lxc_name, | |
2215 | const char *lxc_path) | |
4d5b72a1 | 2216 | { |
d8b712bc | 2217 | int ret; |
949d0338 | 2218 | unsigned long mntflags; |
4d5b72a1 | 2219 | char *mntdata; |
181437fd | 2220 | bool dev, optional, relative; |
949d0338 | 2221 | unsigned long pflags = 0; |
ec50007f | 2222 | char *rootfs_path = NULL; |
d8b712bc CB |
2223 | |
2224 | optional = hasmntopt(mntent, "optional") != NULL; | |
2225 | dev = hasmntopt(mntent, "dev") != NULL; | |
181437fd | 2226 | relative = hasmntopt(mntent, "relative") != NULL; |
d8b712bc | 2227 | |
ec50007f CB |
2228 | if (rootfs && rootfs->path) |
2229 | rootfs_path = rootfs->mount; | |
2230 | ||
d8b712bc CB |
2231 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, |
2232 | lxc_path); | |
2233 | if (ret < 0) { | |
2234 | if (optional) | |
2235 | return 0; | |
608e3567 | 2236 | |
d8b712bc CB |
2237 | return -1; |
2238 | } | |
4e4ca161 SH |
2239 | cull_mntent_opt(mntent); |
2240 | ||
d840039e YT |
2241 | ret = parse_propagationopts(mntent->mnt_opts, &pflags); |
2242 | if (ret < 0) | |
2243 | return -1; | |
2244 | ||
d8b712bc CB |
2245 | ret = parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata); |
2246 | if (ret < 0) | |
a17b1e65 | 2247 | return -1; |
a17b1e65 | 2248 | |
6e46cc0d | 2249 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
d840039e | 2250 | pflags, mntdata, optional, dev, relative, rootfs_path); |
68c152ef | 2251 | |
911324ef | 2252 | free(mntdata); |
911324ef DL |
2253 | return ret; |
2254 | } | |
2255 | ||
db4aba38 NC |
2256 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
2257 | { | |
1433c9f9 | 2258 | int ret; |
07667a6a | 2259 | char path[MAXPATHLEN]; |
1433c9f9 CB |
2260 | |
2261 | /* For containers created without a rootfs all mounts are treated as | |
07667a6a CB |
2262 | * absolute paths starting at / on the host. |
2263 | */ | |
1433c9f9 CB |
2264 | if (mntent->mnt_dir[0] != '/') |
2265 | ret = snprintf(path, sizeof(path), "/%s", mntent->mnt_dir); | |
2266 | else | |
2267 | ret = snprintf(path, sizeof(path), "%s", mntent->mnt_dir); | |
07667a6a | 2268 | if (ret < 0 || ret >= sizeof(path)) |
1433c9f9 | 2269 | return -1; |
1433c9f9 CB |
2270 | |
2271 | return mount_entry_on_generic(mntent, path, NULL, NULL, NULL); | |
db4aba38 NC |
2272 | } |
2273 | ||
4e4ca161 | 2274 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 | 2275 | const struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2276 | const char *lxc_name, |
2277 | const char *lxc_path) | |
911324ef | 2278 | { |
bdd2b34c | 2279 | int offset; |
013bd428 | 2280 | char *aux; |
67e571de | 2281 | const char *lxcpath; |
bdd2b34c CB |
2282 | char path[MAXPATHLEN]; |
2283 | int ret = 0; | |
0ad19a3f | 2284 | |
593e8478 | 2285 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
bdd2b34c | 2286 | if (!lxcpath) |
2a59a681 | 2287 | return -1; |
2a59a681 | 2288 | |
bdd2b34c CB |
2289 | /* If rootfs->path is a blockdev path, allow container fstab to use |
2290 | * <lxcpath>/<name>/rootfs" as the target prefix. | |
2291 | */ | |
2292 | ret = snprintf(path, MAXPATHLEN, "%s/%s/rootfs", lxcpath, lxc_name); | |
2293 | if (ret < 0 || ret >= MAXPATHLEN) | |
80a881b2 SH |
2294 | goto skipvarlib; |
2295 | ||
2296 | aux = strstr(mntent->mnt_dir, path); | |
2297 | if (aux) { | |
2298 | offset = strlen(path); | |
2299 | goto skipabs; | |
2300 | } | |
2301 | ||
2302 | skipvarlib: | |
013bd428 DL |
2303 | aux = strstr(mntent->mnt_dir, rootfs->path); |
2304 | if (!aux) { | |
bdd2b34c | 2305 | WARN("Ignoring mount point \"%s\"", mntent->mnt_dir); |
db4aba38 | 2306 | return ret; |
013bd428 | 2307 | } |
80a881b2 SH |
2308 | offset = strlen(rootfs->path); |
2309 | ||
2310 | skipabs: | |
bdd2b34c CB |
2311 | ret = snprintf(path, MAXPATHLEN, "%s/%s", rootfs->mount, aux + offset); |
2312 | if (ret < 0 || ret >= MAXPATHLEN) | |
a17b1e65 | 2313 | return -1; |
a17b1e65 | 2314 | |
0a2dddd4 | 2315 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef | 2316 | } |
d330fe7b | 2317 | |
4e4ca161 | 2318 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
0a2dddd4 CB |
2319 | const struct lxc_rootfs *rootfs, |
2320 | const char *lxc_name, | |
2321 | const char *lxc_path) | |
911324ef | 2322 | { |
911324ef | 2323 | int ret; |
0fd73091 | 2324 | char path[MAXPATHLEN]; |
d330fe7b | 2325 | |
34cfffb3 | 2326 | /* relative to root mount point */ |
6e46cc0d | 2327 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs->mount, mntent->mnt_dir); |
0fd73091 | 2328 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
9ba8130c | 2329 | return -1; |
911324ef | 2330 | |
0a2dddd4 | 2331 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef DL |
2332 | } |
2333 | ||
06749971 CB |
2334 | static int mount_file_entries(const struct lxc_conf *conf, |
2335 | const struct lxc_rootfs *rootfs, FILE *file, | |
1ae3c19f | 2336 | const char *lxc_name, const char *lxc_path) |
911324ef | 2337 | { |
aaf901be | 2338 | char buf[4096]; |
0fd73091 | 2339 | struct mntent mntent; |
911324ef | 2340 | int ret = -1; |
e76b8764 | 2341 | |
aaf901be | 2342 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
1ae3c19f CB |
2343 | if (!rootfs->path) |
2344 | ret = mount_entry_on_systemfs(&mntent); | |
2345 | else if (mntent.mnt_dir[0] != '/') | |
2346 | ret = mount_entry_on_relative_rootfs(&mntent, rootfs, | |
2347 | lxc_name, lxc_path); | |
2348 | else | |
2349 | ret = mount_entry_on_absolute_rootfs(&mntent, rootfs, | |
2350 | lxc_name, lxc_path); | |
2351 | if (ret < 0) | |
2352 | return -1; | |
0ad19a3f | 2353 | } |
2354 | ret = 0; | |
cd54d859 | 2355 | |
0fd73091 | 2356 | INFO("Finished setting up mounts"); |
e7938e9e MN |
2357 | return ret; |
2358 | } | |
2359 | ||
06749971 CB |
2360 | static int setup_mount(const struct lxc_conf *conf, |
2361 | const struct lxc_rootfs *rootfs, const char *fstab, | |
42dff448 | 2362 | const char *lxc_name, const char *lxc_path) |
e7938e9e | 2363 | { |
42dff448 | 2364 | FILE *f; |
e7938e9e MN |
2365 | int ret; |
2366 | ||
2367 | if (!fstab) | |
2368 | return 0; | |
2369 | ||
42dff448 CB |
2370 | f = setmntent(fstab, "r"); |
2371 | if (!f) { | |
2372 | SYSERROR("Failed to open \"%s\"", fstab); | |
e7938e9e MN |
2373 | return -1; |
2374 | } | |
2375 | ||
06749971 | 2376 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
42dff448 CB |
2377 | if (ret < 0) |
2378 | ERROR("Failed to set up mount entries"); | |
e7938e9e | 2379 | |
42dff448 | 2380 | endmntent(f); |
0ad19a3f | 2381 | return ret; |
2382 | } | |
2383 | ||
1800f924 WB |
2384 | /* |
2385 | * In order for nested containers to be able to mount /proc and /sys they need | |
2386 | * to see a "pure" proc and sysfs mount points with nothing mounted on top | |
2387 | * (like lxcfs). | |
2388 | * For this we provide proc and sysfs in /dev/.lxc/{proc,sys} while using an | |
2389 | * apparmor rule to deny access to them. This is mostly for convenience: The | |
2390 | * container's root user can mount them anyway and thus has access to the two | |
2391 | * file systems. But a non-root user in the container should not be allowed to | |
2392 | * access them as a side effect without explicitly allowing it. | |
2393 | */ | |
2394 | static const char nesting_helpers[] = | |
2395 | "proc dev/.lxc/proc proc create=dir,optional\n" | |
2396 | "sys dev/.lxc/sys sysfs create=dir,optional\n" | |
2397 | ; | |
2398 | ||
2399 | FILE *make_anonymous_mount_file(struct lxc_list *mount, | |
2400 | bool include_nesting_helpers) | |
e7938e9e | 2401 | { |
5ef5c9a3 | 2402 | int ret; |
e7938e9e | 2403 | char *mount_entry; |
5ef5c9a3 | 2404 | struct lxc_list *iterator; |
5ef5c9a3 CB |
2405 | int fd = -1; |
2406 | ||
0fd73091 | 2407 | fd = memfd_create(".lxc_mount_file", MFD_CLOEXEC); |
5ef5c9a3 | 2408 | if (fd < 0) { |
a324e7eb CB |
2409 | char template[] = P_tmpdir "/.lxc_mount_file_XXXXXX"; |
2410 | ||
5ef5c9a3 CB |
2411 | if (errno != ENOSYS) |
2412 | return NULL; | |
a324e7eb CB |
2413 | |
2414 | fd = lxc_make_tmpfile(template, true); | |
0fd73091 CB |
2415 | if (fd < 0) { |
2416 | SYSERROR("Could not create temporary mount file"); | |
2417 | return NULL; | |
2418 | } | |
2419 | ||
6bd04140 | 2420 | TRACE("Created temporary mount file"); |
5ef5c9a3 | 2421 | } |
0fd73091 CB |
2422 | if (fd < 0) { |
2423 | SYSERROR("Could not create temporary mount file"); | |
9fc7f8c0 | 2424 | return NULL; |
e7938e9e MN |
2425 | } |
2426 | ||
0fd73091 CB |
2427 | lxc_list_for_each (iterator, mount) { |
2428 | size_t len; | |
2429 | ||
e7938e9e | 2430 | mount_entry = iterator->elem; |
0fd73091 | 2431 | len = strlen(mount_entry); |
5ef5c9a3 | 2432 | |
489f39be | 2433 | ret = lxc_write_nointr(fd, mount_entry, len); |
0fd73091 CB |
2434 | if (ret != len) |
2435 | goto on_error; | |
2436 | ||
489f39be | 2437 | ret = lxc_write_nointr(fd, "\n", 1); |
0fd73091 CB |
2438 | if (ret != 1) |
2439 | goto on_error; | |
e7938e9e MN |
2440 | } |
2441 | ||
1800f924 WB |
2442 | if (include_nesting_helpers) { |
2443 | ret = lxc_write_nointr(fd, nesting_helpers, | |
2444 | sizeof(nesting_helpers) - 1); | |
2445 | if (ret != sizeof(nesting_helpers) - 1) | |
2446 | goto on_error; | |
2447 | } | |
2448 | ||
0fd73091 CB |
2449 | ret = lseek(fd, 0, SEEK_SET); |
2450 | if (ret < 0) | |
2451 | goto on_error; | |
2452 | ||
2453 | return fdopen(fd, "r+"); | |
2454 | ||
2455 | on_error: | |
2456 | SYSERROR("Failed to write mount entry to temporary mount file"); | |
2457 | close(fd); | |
2458 | return NULL; | |
9fc7f8c0 TA |
2459 | } |
2460 | ||
06749971 CB |
2461 | static int setup_mount_entries(const struct lxc_conf *conf, |
2462 | const struct lxc_rootfs *rootfs, | |
5ef5c9a3 CB |
2463 | struct lxc_list *mount, const char *lxc_name, |
2464 | const char *lxc_path) | |
9fc7f8c0 | 2465 | { |
9fc7f8c0 | 2466 | int ret; |
0fd73091 | 2467 | FILE *f; |
9fc7f8c0 | 2468 | |
1800f924 | 2469 | f = make_anonymous_mount_file(mount, conf->lsm_aa_allow_nesting); |
19b5d755 | 2470 | if (!f) |
9fc7f8c0 | 2471 | return -1; |
e7938e9e | 2472 | |
06749971 | 2473 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
19b5d755 | 2474 | fclose(f); |
0fd73091 | 2475 | |
e7938e9e MN |
2476 | return ret; |
2477 | } | |
2478 | ||
bab88e68 CS |
2479 | static int parse_cap(const char *cap) |
2480 | { | |
84760c11 | 2481 | size_t i; |
2482 | int capid = -1; | |
0fd73091 CB |
2483 | size_t end = sizeof(caps_opt) / sizeof(caps_opt[0]); |
2484 | char *ptr = NULL; | |
bab88e68 | 2485 | |
0fd73091 | 2486 | if (strcmp(cap, "none") == 0) |
7035407c DE |
2487 | return -2; |
2488 | ||
8560cd36 | 2489 | for (i = 0; i < end; i++) { |
bab88e68 CS |
2490 | if (strcmp(cap, caps_opt[i].name)) |
2491 | continue; | |
2492 | ||
2493 | capid = caps_opt[i].value; | |
2494 | break; | |
2495 | } | |
2496 | ||
2497 | if (capid < 0) { | |
0fd73091 CB |
2498 | /* Try to see if it's numeric, so the user may specify |
2499 | * capabilities that the running kernel knows about but we | |
2500 | * don't | |
2501 | */ | |
bab88e68 CS |
2502 | errno = 0; |
2503 | capid = strtol(cap, &ptr, 10); | |
2504 | if (!ptr || *ptr != '\0' || errno != 0) | |
2505 | /* not a valid number */ | |
2506 | capid = -1; | |
2507 | else if (capid > lxc_caps_last_cap()) | |
2508 | /* we have a number but it's not a valid | |
2509 | * capability */ | |
2510 | capid = -1; | |
2511 | } | |
2512 | ||
2513 | return capid; | |
2514 | } | |
2515 | ||
0769b82a CS |
2516 | int in_caplist(int cap, struct lxc_list *caps) |
2517 | { | |
0769b82a | 2518 | int capid; |
0fd73091 | 2519 | struct lxc_list *iterator; |
0769b82a | 2520 | |
0fd73091 | 2521 | lxc_list_for_each (iterator, caps) { |
0769b82a CS |
2522 | capid = parse_cap(iterator->elem); |
2523 | if (capid == cap) | |
2524 | return 1; | |
2525 | } | |
2526 | ||
2527 | return 0; | |
2528 | } | |
2529 | ||
81810dd1 DL |
2530 | static int setup_caps(struct lxc_list *caps) |
2531 | { | |
bab88e68 | 2532 | int capid; |
0fd73091 CB |
2533 | char *drop_entry; |
2534 | struct lxc_list *iterator; | |
81810dd1 | 2535 | |
0fd73091 CB |
2536 | lxc_list_for_each (iterator, caps) { |
2537 | int ret; | |
81810dd1 DL |
2538 | |
2539 | drop_entry = iterator->elem; | |
2540 | ||
bab88e68 | 2541 | capid = parse_cap(drop_entry); |
0fd73091 | 2542 | if (capid < 0) { |
1e11be34 DL |
2543 | ERROR("unknown capability %s", drop_entry); |
2544 | return -1; | |
81810dd1 DL |
2545 | } |
2546 | ||
0fd73091 CB |
2547 | ret = prctl(PR_CAPBSET_DROP, capid, 0, 0, 0); |
2548 | if (ret < 0) { | |
2549 | SYSERROR("Failed to remove %s capability", drop_entry); | |
3ec1648d SH |
2550 | return -1; |
2551 | } | |
0fd73091 | 2552 | DEBUG("Dropped %s (%d) capability", drop_entry, capid); |
81810dd1 DL |
2553 | } |
2554 | ||
0fd73091 | 2555 | DEBUG("Capabilities have been setup"); |
1fb86a7c SH |
2556 | return 0; |
2557 | } | |
2558 | ||
2559 | static int dropcaps_except(struct lxc_list *caps) | |
2560 | { | |
0fd73091 | 2561 | int i, capid, numcaps; |
1fb86a7c | 2562 | char *keep_entry; |
0fd73091 | 2563 | struct lxc_list *iterator; |
1fb86a7c | 2564 | |
0fd73091 | 2565 | numcaps = lxc_caps_last_cap() + 1; |
2caf9a97 SH |
2566 | if (numcaps <= 0 || numcaps > 200) |
2567 | return -1; | |
0fd73091 | 2568 | TRACE("Found %d capabilities", numcaps); |
2caf9a97 | 2569 | |
1a0e70ac | 2570 | /* caplist[i] is 1 if we keep capability i */ |
1fb86a7c SH |
2571 | int *caplist = alloca(numcaps * sizeof(int)); |
2572 | memset(caplist, 0, numcaps * sizeof(int)); | |
2573 | ||
0fd73091 | 2574 | lxc_list_for_each (iterator, caps) { |
1fb86a7c SH |
2575 | keep_entry = iterator->elem; |
2576 | ||
bab88e68 | 2577 | capid = parse_cap(keep_entry); |
7035407c DE |
2578 | if (capid == -2) |
2579 | continue; | |
2580 | ||
0fd73091 CB |
2581 | if (capid < 0) { |
2582 | ERROR("Unknown capability %s", keep_entry); | |
1fb86a7c SH |
2583 | return -1; |
2584 | } | |
2585 | ||
0fd73091 | 2586 | DEBUG("Keep capability %s (%d)", keep_entry, capid); |
1fb86a7c SH |
2587 | caplist[capid] = 1; |
2588 | } | |
0fd73091 CB |
2589 | |
2590 | for (i = 0; i < numcaps; i++) { | |
2591 | int ret; | |
2592 | ||
1fb86a7c SH |
2593 | if (caplist[i]) |
2594 | continue; | |
0fd73091 CB |
2595 | |
2596 | ret = prctl(PR_CAPBSET_DROP, i, 0, 0, 0); | |
2597 | if (ret < 0) { | |
2598 | SYSERROR("Failed to remove capability %d", i); | |
3ec1648d SH |
2599 | return -1; |
2600 | } | |
1fb86a7c SH |
2601 | } |
2602 | ||
0fd73091 | 2603 | DEBUG("Capabilities have been setup"); |
81810dd1 DL |
2604 | return 0; |
2605 | } | |
2606 | ||
0fd73091 CB |
2607 | static int parse_resource(const char *res) |
2608 | { | |
2609 | int ret; | |
c6d09e15 WB |
2610 | size_t i; |
2611 | int resid = -1; | |
2612 | ||
0fd73091 | 2613 | for (i = 0; i < sizeof(limit_opt) / sizeof(limit_opt[0]); ++i) |
c6d09e15 WB |
2614 | if (strcmp(res, limit_opt[i].name) == 0) |
2615 | return limit_opt[i].value; | |
c6d09e15 | 2616 | |
0fd73091 | 2617 | /* Try to see if it's numeric, so the user may specify |
c6d09e15 | 2618 | * resources that the running kernel knows about but |
0fd73091 CB |
2619 | * we don't. |
2620 | */ | |
2621 | ret = lxc_safe_int(res, &resid); | |
2622 | if (ret < 0) | |
2623 | return -1; | |
2624 | ||
2625 | return resid; | |
c6d09e15 WB |
2626 | } |
2627 | ||
0fd73091 CB |
2628 | int setup_resource_limits(struct lxc_list *limits, pid_t pid) |
2629 | { | |
2630 | int resid; | |
c6d09e15 WB |
2631 | struct lxc_list *it; |
2632 | struct lxc_limit *lim; | |
c6d09e15 | 2633 | |
0fd73091 | 2634 | lxc_list_for_each (it, limits) { |
c6d09e15 WB |
2635 | lim = it->elem; |
2636 | ||
2637 | resid = parse_resource(lim->resource); | |
2638 | if (resid < 0) { | |
0fd73091 | 2639 | ERROR("Unknown resource %s", lim->resource); |
c6d09e15 WB |
2640 | return -1; |
2641 | } | |
2642 | ||
f48b5fd8 | 2643 | #if HAVE_PRLIMIT || HAVE_PRLIMIT64 |
c6d09e15 | 2644 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) { |
6d1400b5 | 2645 | SYSERROR("Failed to set limit %s", lim->resource); |
c6d09e15 WB |
2646 | return -1; |
2647 | } | |
f48b5fd8 FF |
2648 | #else |
2649 | ERROR("Cannot set limit %s as prlimit is missing", lim->resource); | |
2650 | return -1; | |
2651 | #endif | |
c6d09e15 | 2652 | } |
0fd73091 | 2653 | |
c6d09e15 WB |
2654 | return 0; |
2655 | } | |
2656 | ||
7edd0540 L |
2657 | int setup_sysctl_parameters(struct lxc_list *sysctls) |
2658 | { | |
2659 | struct lxc_list *it; | |
2660 | struct lxc_sysctl *elem; | |
0fd73091 | 2661 | int ret = 0; |
7edd0540 L |
2662 | char *tmp = NULL; |
2663 | char filename[MAXPATHLEN] = {0}; | |
7edd0540 | 2664 | |
0fd73091 | 2665 | lxc_list_for_each (it, sysctls) { |
7edd0540 L |
2666 | elem = it->elem; |
2667 | tmp = lxc_string_replace(".", "/", elem->key); | |
2668 | if (!tmp) { | |
2669 | ERROR("Failed to replace key %s", elem->key); | |
2670 | return -1; | |
2671 | } | |
2672 | ||
2673 | ret = snprintf(filename, sizeof(filename), "/proc/sys/%s", tmp); | |
2674 | free(tmp); | |
2675 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { | |
2676 | ERROR("Error setting up sysctl parameters path"); | |
2677 | return -1; | |
2678 | } | |
2679 | ||
0fd73091 | 2680 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2681 | strlen(elem->value), false, 0666); |
7edd0540 | 2682 | if (ret < 0) { |
0fd73091 CB |
2683 | ERROR("Failed to setup sysctl parameters %s to %s", |
2684 | elem->key, elem->value); | |
7edd0540 L |
2685 | return -1; |
2686 | } | |
2687 | } | |
0fd73091 | 2688 | |
7edd0540 L |
2689 | return 0; |
2690 | } | |
2691 | ||
61d7a733 YT |
2692 | int setup_proc_filesystem(struct lxc_list *procs, pid_t pid) |
2693 | { | |
2694 | struct lxc_list *it; | |
2695 | struct lxc_proc *elem; | |
0fd73091 | 2696 | int ret = 0; |
61d7a733 YT |
2697 | char *tmp = NULL; |
2698 | char filename[MAXPATHLEN] = {0}; | |
61d7a733 | 2699 | |
0fd73091 | 2700 | lxc_list_for_each (it, procs) { |
61d7a733 YT |
2701 | elem = it->elem; |
2702 | tmp = lxc_string_replace(".", "/", elem->filename); | |
2703 | if (!tmp) { | |
2704 | ERROR("Failed to replace key %s", elem->filename); | |
2705 | return -1; | |
2706 | } | |
2707 | ||
2708 | ret = snprintf(filename, sizeof(filename), "/proc/%d/%s", pid, tmp); | |
2709 | free(tmp); | |
2710 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { | |
2711 | ERROR("Error setting up proc filesystem path"); | |
2712 | return -1; | |
2713 | } | |
2714 | ||
0fd73091 | 2715 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2716 | strlen(elem->value), false, 0666); |
61d7a733 | 2717 | if (ret < 0) { |
0fd73091 CB |
2718 | ERROR("Failed to setup proc filesystem %s to %s", |
2719 | elem->filename, elem->value); | |
61d7a733 YT |
2720 | return -1; |
2721 | } | |
2722 | } | |
0fd73091 | 2723 | |
61d7a733 YT |
2724 | return 0; |
2725 | } | |
2726 | ||
ae9242c8 SH |
2727 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2728 | ||
7b379ab3 | 2729 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2730 | { |
26ddeedd | 2731 | int i; |
0fd73091 | 2732 | struct lxc_conf *new; |
7b379ab3 | 2733 | |
13277ec4 | 2734 | new = malloc(sizeof(*new)); |
0fd73091 | 2735 | if (!new) |
7b379ab3 | 2736 | return NULL; |
7b379ab3 MN |
2737 | memset(new, 0, sizeof(*new)); |
2738 | ||
4b73005c | 2739 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
cccc74b5 | 2740 | new->personality = -1; |
124fa0a8 | 2741 | new->autodev = 1; |
3a784510 | 2742 | new->console.buffer_size = 0; |
596a818d DE |
2743 | new->console.log_path = NULL; |
2744 | new->console.log_fd = -1; | |
861813e5 | 2745 | new->console.log_size = 0; |
28a4b0e5 | 2746 | new->console.path = NULL; |
63376d7d | 2747 | new->console.peer = -1; |
fb87aa6a CB |
2748 | new->console.proxy.busy = -1; |
2749 | new->console.proxy.master = -1; | |
2750 | new->console.proxy.slave = -1; | |
63376d7d DL |
2751 | new->console.master = -1; |
2752 | new->console.slave = -1; | |
2753 | new->console.name[0] = '\0'; | |
732375f5 | 2754 | memset(&new->console.ringbuf, 0, sizeof(struct lxc_ringbuf)); |
d2e30e99 | 2755 | new->maincmd_fd = -1; |
258f8051 | 2756 | new->monitor_signal_pdeath = SIGKILL; |
76a26f55 | 2757 | new->nbd_idx = -1; |
54c30e29 | 2758 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 2759 | if (!new->rootfs.mount) { |
53f3f048 SH |
2760 | free(new); |
2761 | return NULL; | |
2762 | } | |
6e54330c | 2763 | new->rootfs.managed = true; |
858377e4 | 2764 | new->logfd = -1; |
7b379ab3 | 2765 | lxc_list_init(&new->cgroup); |
54860ed0 | 2766 | lxc_list_init(&new->cgroup2); |
7b379ab3 MN |
2767 | lxc_list_init(&new->network); |
2768 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2769 | lxc_list_init(&new->caps); |
1fb86a7c | 2770 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2771 | lxc_list_init(&new->id_map); |
46ad64ab CB |
2772 | new->root_nsuid_map = NULL; |
2773 | new->root_nsgid_map = NULL; | |
f979ac15 | 2774 | lxc_list_init(&new->includes); |
4184c3e1 | 2775 | lxc_list_init(&new->aliens); |
7c661726 | 2776 | lxc_list_init(&new->environment); |
c6d09e15 | 2777 | lxc_list_init(&new->limits); |
7edd0540 | 2778 | lxc_list_init(&new->sysctls); |
61d7a733 | 2779 | lxc_list_init(&new->procs); |
44ae0fb6 | 2780 | new->hooks_version = 0; |
28d9e29e | 2781 | for (i = 0; i < NUM_LXC_HOOKS; i++) |
26ddeedd | 2782 | lxc_list_init(&new->hooks[i]); |
ee1e7aa0 | 2783 | lxc_list_init(&new->groups); |
d39b10eb | 2784 | lxc_list_init(&new->state_clients); |
fe4de9a6 | 2785 | new->lsm_aa_profile = NULL; |
1800f924 | 2786 | lxc_list_init(&new->lsm_aa_raw); |
fe4de9a6 | 2787 | new->lsm_se_context = NULL; |
7a0bcca3 | 2788 | new->tmp_umount_proc = false; |
7a41e857 LT |
2789 | new->tmp_umount_proc = 0; |
2790 | new->shmount.path_host = NULL; | |
2791 | new->shmount.path_cont = NULL; | |
7b379ab3 | 2792 | |
72bb04e4 PT |
2793 | /* if running in a new user namespace, init and COMMAND |
2794 | * default to running as UID/GID 0 when using lxc-execute */ | |
2795 | new->init_uid = 0; | |
2796 | new->init_gid = 0; | |
43654d34 | 2797 | memset(&new->cgroup_meta, 0, sizeof(struct lxc_cgroup)); |
b074bbf1 | 2798 | memset(&new->ns_share, 0, sizeof(char *) * LXC_NS_MAX); |
72bb04e4 | 2799 | |
7b379ab3 | 2800 | return new; |
089cd8b8 DL |
2801 | } |
2802 | ||
344c9d81 | 2803 | int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
a19b974f | 2804 | size_t buf_size) |
f6d3e3e4 | 2805 | { |
29053180 | 2806 | int fd, ret; |
0fd73091 | 2807 | char path[MAXPATHLEN]; |
f6d3e3e4 | 2808 | |
a19b974f CB |
2809 | if (geteuid() != 0 && idtype == ID_TYPE_GID) { |
2810 | size_t buflen; | |
2811 | ||
2812 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/setgroups", pid); | |
0fd73091 | 2813 | if (ret < 0 || ret >= MAXPATHLEN) |
a19b974f | 2814 | return -E2BIG; |
a19b974f CB |
2815 | |
2816 | fd = open(path, O_WRONLY); | |
2817 | if (fd < 0 && errno != ENOENT) { | |
2818 | SYSERROR("Failed to open \"%s\"", path); | |
2819 | return -1; | |
2820 | } | |
2821 | ||
2388737b CB |
2822 | if (fd >= 0) { |
2823 | buflen = sizeof("deny\n") - 1; | |
2824 | errno = 0; | |
2825 | ret = lxc_write_nointr(fd, "deny\n", buflen); | |
395b1a3e | 2826 | close(fd); |
2388737b | 2827 | if (ret != buflen) { |
0fd73091 CB |
2828 | SYSERROR("Failed to write \"deny\" to " |
2829 | "\"/proc/%d/setgroups\"", pid); | |
2388737b CB |
2830 | return -1; |
2831 | } | |
395b1a3e | 2832 | TRACE("Wrote \"deny\" to \"/proc/%d/setgroups\"", pid); |
a19b974f | 2833 | } |
a19b974f CB |
2834 | } |
2835 | ||
29053180 CB |
2836 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/%cid_map", pid, |
2837 | idtype == ID_TYPE_UID ? 'u' : 'g'); | |
0fd73091 | 2838 | if (ret < 0 || ret >= MAXPATHLEN) |
f6d3e3e4 | 2839 | return -E2BIG; |
29053180 CB |
2840 | |
2841 | fd = open(path, O_WRONLY); | |
2842 | if (fd < 0) { | |
a19b974f | 2843 | SYSERROR("Failed to open \"%s\"", path); |
29053180 | 2844 | return -1; |
f6d3e3e4 | 2845 | } |
29053180 CB |
2846 | |
2847 | errno = 0; | |
2848 | ret = lxc_write_nointr(fd, buf, buf_size); | |
395b1a3e | 2849 | close(fd); |
29053180 | 2850 | if (ret != buf_size) { |
a19b974f | 2851 | SYSERROR("Failed to write %cid mapping to \"%s\"", |
29053180 | 2852 | idtype == ID_TYPE_UID ? 'u' : 'g', path); |
29053180 CB |
2853 | return -1; |
2854 | } | |
29053180 CB |
2855 | |
2856 | return 0; | |
f6d3e3e4 SH |
2857 | } |
2858 | ||
6e50e704 CB |
2859 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
2860 | * | |
2861 | * @return 1 if functional binary was found | |
2862 | * @return 0 if binary exists but is lacking privilege | |
2863 | * @return -ENOENT if binary does not exist | |
2864 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
6e50e704 | 2865 | */ |
df6a2945 CB |
2866 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
2867 | { | |
2868 | char *path; | |
2869 | int ret; | |
2870 | struct stat st; | |
2871 | int fret = 0; | |
2872 | ||
6e50e704 CB |
2873 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
2874 | return -EINVAL; | |
2875 | ||
df6a2945 CB |
2876 | path = on_path(binary, NULL); |
2877 | if (!path) | |
2878 | return -ENOENT; | |
2879 | ||
2880 | ret = stat(path, &st); | |
2881 | if (ret < 0) { | |
2882 | fret = -errno; | |
2883 | goto cleanup; | |
2884 | } | |
2885 | ||
2886 | /* Check if the binary is setuid. */ | |
2887 | if (st.st_mode & S_ISUID) { | |
0fd73091 | 2888 | DEBUG("The binary \"%s\" does have the setuid bit set", path); |
df6a2945 CB |
2889 | fret = 1; |
2890 | goto cleanup; | |
2891 | } | |
2892 | ||
0fd73091 | 2893 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
2894 | /* Check if it has the CAP_SETUID capability. */ |
2895 | if ((cap & CAP_SETUID) && | |
2896 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
2897 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) { | |
2898 | DEBUG("The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE " | |
0fd73091 | 2899 | "and CAP_PERMITTED sets", path); |
df6a2945 CB |
2900 | fret = 1; |
2901 | goto cleanup; | |
2902 | } | |
2903 | ||
2904 | /* Check if it has the CAP_SETGID capability. */ | |
2905 | if ((cap & CAP_SETGID) && | |
2906 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
2907 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) { | |
2908 | DEBUG("The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE " | |
0fd73091 | 2909 | "and CAP_PERMITTED sets", path); |
df6a2945 CB |
2910 | fret = 1; |
2911 | goto cleanup; | |
2912 | } | |
0fd73091 | 2913 | #else |
69924fff CB |
2914 | /* If we cannot check for file capabilities we need to give the benefit |
2915 | * of the doubt. Otherwise we might fail even though all the necessary | |
2916 | * file capabilities are set. | |
2917 | */ | |
d6018f88 | 2918 | DEBUG("Cannot check for file capabilites as full capability support is " |
0fd73091 | 2919 | "missing. Manual intervention needed"); |
d6018f88 | 2920 | fret = 1; |
0fd73091 | 2921 | #endif |
df6a2945 CB |
2922 | |
2923 | cleanup: | |
2924 | free(path); | |
2925 | return fret; | |
2926 | } | |
2927 | ||
986ef930 CB |
2928 | int lxc_map_ids_exec_wrapper(void *args) |
2929 | { | |
2930 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
2931 | return -1; | |
2932 | } | |
2933 | ||
f6d3e3e4 SH |
2934 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) |
2935 | { | |
0fd73091 | 2936 | int fill, left; |
986ef930 | 2937 | char u_or_g; |
4bc3b759 | 2938 | char *pos; |
986ef930 | 2939 | char cmd_output[MAXPATHLEN]; |
0fd73091 CB |
2940 | struct id_map *map; |
2941 | struct lxc_list *iterator; | |
2942 | enum idtype type; | |
986ef930 CB |
2943 | /* strlen("new@idmap") = 9 |
2944 | * + | |
2945 | * strlen(" ") = 1 | |
2946 | * + | |
2947 | * LXC_NUMSTRLEN64 | |
2948 | * + | |
2949 | * strlen(" ") = 1 | |
2950 | * | |
2951 | * We add some additional space to make sure that we really have | |
2952 | * LXC_IDMAPLEN bytes available for our the {g,u]id mapping. | |
2953 | */ | |
0fd73091 | 2954 | int ret = 0, gidmap = 0, uidmap = 0; |
986ef930 | 2955 | char mapbuf[9 + 1 + LXC_NUMSTRLEN64 + 1 + LXC_IDMAPLEN] = {0}; |
0fd73091 | 2956 | bool had_entry = false, use_shadow = false; |
c724025c JC |
2957 | int hostuid, hostgid; |
2958 | ||
2959 | hostuid = geteuid(); | |
2960 | hostgid = getegid(); | |
df6a2945 CB |
2961 | |
2962 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid | |
2963 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
2964 | * will protected it by preventing another user from being handed the |
2965 | * range by shadow. | |
2966 | */ | |
df6a2945 | 2967 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
2968 | if (uidmap == -ENOENT) |
2969 | WARN("newuidmap binary is missing"); | |
2970 | else if (!uidmap) | |
2971 | WARN("newuidmap is lacking necessary privileges"); | |
2972 | ||
df6a2945 | 2973 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
2974 | if (gidmap == -ENOENT) |
2975 | WARN("newgidmap binary is missing"); | |
2976 | else if (!gidmap) | |
2977 | WARN("newgidmap is lacking necessary privileges"); | |
2978 | ||
df6a2945 | 2979 | if (uidmap > 0 && gidmap > 0) { |
0fd73091 | 2980 | DEBUG("Functional newuidmap and newgidmap binary found"); |
4bc3b759 | 2981 | use_shadow = true; |
df6a2945 | 2982 | } else { |
99d43365 CB |
2983 | /* In case unprivileged users run application containers via |
2984 | * execute() or a start*() there are valid cases where they may | |
2985 | * only want to map their own {g,u}id. Let's not block them from | |
2986 | * doing so by requiring geteuid() == 0. | |
2987 | */ | |
2988 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
c724025c JC |
2989 | "write directly with euid %d", hostuid); |
2990 | } | |
2991 | ||
2992 | /* Check if we really need to use newuidmap and newgidmap. | |
2993 | * If the user is only remapping his own {g,u}id, we don't need it. | |
2994 | */ | |
2995 | if (use_shadow && lxc_list_len(idmap) == 2) { | |
2996 | use_shadow = false; | |
2997 | lxc_list_for_each(iterator, idmap) { | |
2998 | map = iterator->elem; | |
2999 | if (map->idtype == ID_TYPE_UID && map->range == 1 && | |
3000 | map->nsid == hostuid && map->hostid == hostuid) | |
3001 | continue; | |
3002 | if (map->idtype == ID_TYPE_GID && map->range == 1 && | |
3003 | map->nsid == hostgid && map->hostid == hostgid) | |
3004 | continue; | |
3005 | use_shadow = true; | |
3006 | break; | |
3007 | } | |
0e6e3a41 | 3008 | } |
251d0d2a | 3009 | |
986ef930 CB |
3010 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
3011 | type++, u_or_g = 'g') { | |
3012 | pos = mapbuf; | |
3013 | ||
0e6e3a41 | 3014 | if (use_shadow) |
986ef930 | 3015 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 3016 | |
cf3ef16d | 3017 | lxc_list_for_each(iterator, idmap) { |
251d0d2a | 3018 | map = iterator->elem; |
cf3ef16d SH |
3019 | if (map->idtype != type) |
3020 | continue; | |
3021 | ||
4bc3b759 CB |
3022 | had_entry = true; |
3023 | ||
986ef930 | 3024 | left = LXC_IDMAPLEN - (pos - mapbuf); |
d1838f34 | 3025 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
3026 | use_shadow ? " " : "", map->nsid, |
3027 | map->hostid, map->range, | |
0e6e3a41 | 3028 | use_shadow ? "" : "\n"); |
a427e268 CB |
3029 | if (fill <= 0 || fill >= left) { |
3030 | /* The kernel only takes <= 4k for writes to | |
3031 | * /proc/<pid>/{g,u}id_map | |
3032 | */ | |
3033 | SYSERROR("Too many %cid mappings defined", u_or_g); | |
3034 | return -1; | |
3035 | } | |
4bc3b759 | 3036 | |
cf3ef16d | 3037 | pos += fill; |
251d0d2a | 3038 | } |
cf3ef16d | 3039 | if (!had_entry) |
4f7521b4 | 3040 | continue; |
cf3ef16d | 3041 | |
986ef930 CB |
3042 | /* Try to catch the ouput of new{g,u}idmap to make debugging |
3043 | * easier. | |
3044 | */ | |
3045 | if (use_shadow) { | |
3046 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3047 | lxc_map_ids_exec_wrapper, | |
3048 | (void *)mapbuf); | |
3049 | if (ret < 0) { | |
54fbbeb5 CB |
3050 | ERROR("new%cidmap failed to write mapping \"%s\": %s", |
3051 | u_or_g, cmd_output, mapbuf); | |
986ef930 CB |
3052 | return -1; |
3053 | } | |
54fbbeb5 | 3054 | TRACE("new%cidmap wrote mapping \"%s\"", u_or_g, mapbuf); |
d1838f34 | 3055 | } else { |
986ef930 | 3056 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
54fbbeb5 | 3057 | if (ret < 0) { |
da0f9977 | 3058 | ERROR("Failed to write mapping: %s", mapbuf); |
986ef930 | 3059 | return -1; |
54fbbeb5 CB |
3060 | } |
3061 | TRACE("Wrote mapping \"%s\"", mapbuf); | |
d1838f34 | 3062 | } |
986ef930 CB |
3063 | |
3064 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 3065 | } |
251d0d2a | 3066 | |
986ef930 | 3067 | return 0; |
f6d3e3e4 SH |
3068 | } |
3069 | ||
0fd73091 | 3070 | /* Return the host uid/gid to which the container root is mapped in val. |
0b3a6504 | 3071 | * Return true if id was found, false otherwise. |
cf3ef16d | 3072 | */ |
2a9a80cb | 3073 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
4160c3a0 | 3074 | unsigned long *val) |
cf3ef16d | 3075 | { |
4160c3a0 | 3076 | unsigned nsid; |
0fd73091 CB |
3077 | struct id_map *map; |
3078 | struct lxc_list *it; | |
4160c3a0 CB |
3079 | |
3080 | if (idtype == ID_TYPE_UID) | |
3081 | nsid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; | |
3082 | else | |
3083 | nsid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
cf3ef16d | 3084 | |
0fd73091 | 3085 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 3086 | map = it->elem; |
7b50c609 | 3087 | if (map->idtype != idtype) |
cf3ef16d | 3088 | continue; |
4160c3a0 | 3089 | if (map->nsid != nsid) |
cf3ef16d | 3090 | continue; |
2a9a80cb SH |
3091 | *val = map->hostid; |
3092 | return true; | |
cf3ef16d | 3093 | } |
4160c3a0 | 3094 | |
2a9a80cb | 3095 | return false; |
cf3ef16d SH |
3096 | } |
3097 | ||
2133f58c | 3098 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3099 | { |
cf3ef16d | 3100 | struct id_map *map; |
0fd73091 CB |
3101 | struct lxc_list *it; |
3102 | ||
3103 | lxc_list_for_each (it, &conf->id_map) { | |
cf3ef16d | 3104 | map = it->elem; |
2133f58c | 3105 | if (map->idtype != idtype) |
cf3ef16d | 3106 | continue; |
0fd73091 | 3107 | |
cf3ef16d | 3108 | if (id >= map->hostid && id < map->hostid + map->range) |
57d116ab | 3109 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 3110 | } |
0fd73091 | 3111 | |
57d116ab | 3112 | return -1; |
cf3ef16d SH |
3113 | } |
3114 | ||
339efad9 | 3115 | int find_unmapped_nsid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3116 | { |
cf3ef16d | 3117 | struct id_map *map; |
0fd73091 | 3118 | struct lxc_list *it; |
2133f58c | 3119 | unsigned int freeid = 0; |
0fd73091 | 3120 | |
cf3ef16d | 3121 | again: |
0fd73091 | 3122 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 3123 | map = it->elem; |
2133f58c | 3124 | if (map->idtype != idtype) |
cf3ef16d | 3125 | continue; |
0fd73091 | 3126 | |
cf3ef16d SH |
3127 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { |
3128 | freeid = map->nsid + map->range; | |
3129 | goto again; | |
3130 | } | |
3131 | } | |
0fd73091 | 3132 | |
cf3ef16d SH |
3133 | return freeid; |
3134 | } | |
3135 | ||
f4f52cb5 CB |
3136 | int chown_mapped_root_exec_wrapper(void *args) |
3137 | { | |
3138 | execvp("lxc-usernsexec", args); | |
3139 | return -1; | |
3140 | } | |
3141 | ||
0fd73091 | 3142 | /* chown_mapped_root: for an unprivileged user with uid/gid X to |
7b50c609 TS |
3143 | * chown a dir to subuid/subgid Y, he needs to run chown as root |
3144 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
3145 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
3146 | * root is privileged with respect to hostuid/hostgid X, allowing | |
3147 | * him to do the chown. | |
f6d3e3e4 | 3148 | */ |
41dc7155 | 3149 | int chown_mapped_root(const char *path, struct lxc_conf *conf) |
f6d3e3e4 | 3150 | { |
f4f52cb5 | 3151 | uid_t rootuid, rootgid; |
2a9a80cb | 3152 | unsigned long val; |
f4f52cb5 CB |
3153 | int hostuid, hostgid, ret; |
3154 | struct stat sb; | |
3155 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
3156 | char ugid[100]; | |
41dc7155 | 3157 | const char *args1[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3158 | "-m", map1, |
3159 | "-m", map2, | |
3160 | "-m", map3, | |
3161 | "-m", map5, | |
3162 | "--", "chown", ugid, path, | |
3163 | NULL}; | |
41dc7155 | 3164 | const char *args2[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3165 | "-m", map1, |
3166 | "-m", map2, | |
3167 | "-m", map3, | |
3168 | "-m", map4, | |
3169 | "-m", map5, | |
3170 | "--", "chown", ugid, path, | |
3171 | NULL}; | |
3172 | char cmd_output[MAXPATHLEN]; | |
3173 | ||
3174 | hostuid = geteuid(); | |
3175 | hostgid = getegid(); | |
f6d3e3e4 | 3176 | |
2a9a80cb | 3177 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
bc80f098 | 3178 | ERROR("No uid mapping for container root"); |
c4d10a05 | 3179 | return -1; |
f6d3e3e4 | 3180 | } |
f4f52cb5 | 3181 | rootuid = (uid_t)val; |
0fd73091 | 3182 | |
7b50c609 | 3183 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { |
bc80f098 | 3184 | ERROR("No gid mapping for container root"); |
7b50c609 TS |
3185 | return -1; |
3186 | } | |
f4f52cb5 | 3187 | rootgid = (gid_t)val; |
2a9a80cb | 3188 | |
f4f52cb5 | 3189 | if (hostuid == 0) { |
7b50c609 | 3190 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3191 | ERROR("Error chowning %s", path); |
3192 | return -1; | |
3193 | } | |
0fd73091 | 3194 | |
c4d10a05 SH |
3195 | return 0; |
3196 | } | |
f3d7e4ca | 3197 | |
f4f52cb5 | 3198 | if (rootuid == hostuid) { |
1a0e70ac | 3199 | /* nothing to do */ |
b103ceac | 3200 | INFO("Container root is our uid; no need to chown"); |
f3d7e4ca SH |
3201 | return 0; |
3202 | } | |
3203 | ||
bbdbf8f0 | 3204 | /* save the current gid of "path" */ |
f4f52cb5 CB |
3205 | if (stat(path, &sb) < 0) { |
3206 | ERROR("Error stat %s", path); | |
f6d3e3e4 SH |
3207 | return -1; |
3208 | } | |
7b50c609 | 3209 | |
bbdbf8f0 CB |
3210 | /* Update the path argument in case this was overlayfs. */ |
3211 | args1[sizeof(args1) / sizeof(args1[0]) - 2] = path; | |
3212 | args2[sizeof(args2) / sizeof(args2[0]) - 2] = path; | |
3213 | ||
f4f52cb5 CB |
3214 | /* |
3215 | * A file has to be group-owned by a gid mapped into the | |
3216 | * container, or the container won't be privileged over it. | |
3217 | */ | |
3218 | DEBUG("trying to chown \"%s\" to %d", path, hostgid); | |
3219 | if (sb.st_uid == hostuid && | |
3220 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3221 | chown(path, -1, hostgid) < 0) { | |
3222 | ERROR("Failed chgrping %s", path); | |
3223 | return -1; | |
3224 | } | |
f6d3e3e4 | 3225 | |
1a0e70ac | 3226 | /* "u:0:rootuid:1" */ |
f4f52cb5 CB |
3227 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); |
3228 | if (ret < 0 || ret >= 100) { | |
3229 | ERROR("Error uid printing map string"); | |
3230 | return -1; | |
3231 | } | |
7b50c609 | 3232 | |
1a0e70ac | 3233 | /* "u:hostuid:hostuid:1" */ |
f4f52cb5 CB |
3234 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); |
3235 | if (ret < 0 || ret >= 100) { | |
3236 | ERROR("Error uid printing map string"); | |
3237 | return -1; | |
3238 | } | |
c4d10a05 | 3239 | |
1a0e70ac | 3240 | /* "g:0:rootgid:1" */ |
f4f52cb5 CB |
3241 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); |
3242 | if (ret < 0 || ret >= 100) { | |
3243 | ERROR("Error gid printing map string"); | |
3244 | return -1; | |
3245 | } | |
98e5ba51 | 3246 | |
1a0e70ac | 3247 | /* "g:pathgid:rootgid+pathgid:1" */ |
f4f52cb5 CB |
3248 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, |
3249 | rootgid + (gid_t)sb.st_gid); | |
3250 | if (ret < 0 || ret >= 100) { | |
3251 | ERROR("Error gid printing map string"); | |
3252 | return -1; | |
3253 | } | |
c4d10a05 | 3254 | |
1a0e70ac | 3255 | /* "g:hostgid:hostgid:1" */ |
f4f52cb5 CB |
3256 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); |
3257 | if (ret < 0 || ret >= 100) { | |
3258 | ERROR("Error gid printing map string"); | |
3259 | return -1; | |
3260 | } | |
7b50c609 | 3261 | |
1a0e70ac | 3262 | /* "0:pathgid" (chown) */ |
f4f52cb5 CB |
3263 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); |
3264 | if (ret < 0 || ret >= 100) { | |
3265 | ERROR("Error owner printing format string for chown"); | |
3266 | return -1; | |
3267 | } | |
7b50c609 | 3268 | |
f4f52cb5 CB |
3269 | if (hostgid == sb.st_gid) |
3270 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3271 | chown_mapped_root_exec_wrapper, | |
3272 | (void *)args1); | |
3273 | else | |
3274 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3275 | chown_mapped_root_exec_wrapper, | |
3276 | (void *)args2); | |
3277 | if (ret < 0) | |
3278 | ERROR("lxc-usernsexec failed: %s", cmd_output); | |
7b50c609 | 3279 | |
f4f52cb5 | 3280 | return ret; |
f6d3e3e4 SH |
3281 | } |
3282 | ||
943144d9 CB |
3283 | /* NOTE: Must not be called from inside the container namespace! */ |
3284 | int lxc_create_tmp_proc_mount(struct lxc_conf *conf) | |
5112cd70 SH |
3285 | { |
3286 | int mounted; | |
3287 | ||
943144d9 | 3288 | mounted = lxc_mount_proc_if_needed(conf->rootfs.path ? conf->rootfs.mount : ""); |
5112cd70 | 3289 | if (mounted == -1) { |
0fd73091 | 3290 | SYSERROR("Failed to mount proc in the container"); |
01958b1f | 3291 | /* continue only if there is no rootfs */ |
943144d9 | 3292 | if (conf->rootfs.path) |
01958b1f | 3293 | return -1; |
5112cd70 | 3294 | } else if (mounted == 1) { |
7a0bcca3 | 3295 | conf->tmp_umount_proc = true; |
5112cd70 | 3296 | } |
943144d9 | 3297 | |
5112cd70 SH |
3298 | return 0; |
3299 | } | |
3300 | ||
3301 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3302 | { | |
7a0bcca3 | 3303 | if (!lxc_conf->tmp_umount_proc) |
0fd73091 CB |
3304 | return; |
3305 | ||
7a0bcca3 CB |
3306 | (void)umount2("/proc", MNT_DETACH); |
3307 | lxc_conf->tmp_umount_proc = false; | |
5112cd70 SH |
3308 | } |
3309 | ||
0fd73091 | 3310 | /* Walk /proc/mounts and change any shared entries to slave. */ |
6a0c909a | 3311 | void remount_all_slave(void) |
e995d7a2 | 3312 | { |
6a49f05e CB |
3313 | int memfd, mntinfo_fd, ret; |
3314 | ssize_t copied; | |
0fd73091 | 3315 | FILE *f; |
e995d7a2 | 3316 | size_t len = 0; |
0fd73091 | 3317 | char *line = NULL; |
e995d7a2 | 3318 | |
6a49f05e | 3319 | mntinfo_fd = open("/proc/self/mountinfo", O_RDONLY | O_CLOEXEC); |
fea3b91d DJ |
3320 | if (mntinfo_fd < 0) { |
3321 | SYSERROR("Failed to open \"/proc/self/mountinfo\""); | |
6a49f05e | 3322 | return; |
fea3b91d | 3323 | } |
6a49f05e CB |
3324 | |
3325 | memfd = memfd_create(".lxc_mountinfo", MFD_CLOEXEC); | |
3326 | if (memfd < 0) { | |
3327 | char template[] = P_tmpdir "/.lxc_mountinfo_XXXXXX"; | |
3328 | ||
3329 | if (errno != ENOSYS) { | |
fea3b91d | 3330 | SYSERROR("Failed to create temporary in-memory file"); |
6a49f05e | 3331 | close(mntinfo_fd); |
6a49f05e CB |
3332 | return; |
3333 | } | |
3334 | ||
3335 | memfd = lxc_make_tmpfile(template, true); | |
fea3b91d DJ |
3336 | if (memfd < 0) { |
3337 | close(mntinfo_fd); | |
3338 | WARN("Failed to create temporary file"); | |
3339 | return; | |
3340 | } | |
6a49f05e CB |
3341 | } |
3342 | ||
3343 | #define __LXC_SENDFILE_MAX 0x7ffff000 /* maximum number of bytes sendfile can handle */ | |
3344 | again: | |
3345 | copied = sendfile(memfd, mntinfo_fd, NULL, __LXC_SENDFILE_MAX); | |
3346 | if (copied < 0) { | |
3347 | if (errno == EINTR) | |
3348 | goto again; | |
3349 | ||
fea3b91d | 3350 | SYSERROR("Failed to copy \"/proc/self/mountinfo\""); |
6a49f05e CB |
3351 | close(mntinfo_fd); |
3352 | close(memfd); | |
6a49f05e CB |
3353 | return; |
3354 | } | |
3355 | close(mntinfo_fd); | |
3356 | ||
3357 | /* After a successful fdopen() memfd will be closed when calling | |
3358 | * fclose(f). Calling close(memfd) afterwards is undefined. | |
3359 | */ | |
3360 | ret = lseek(memfd, 0, SEEK_SET); | |
3361 | if (ret < 0) { | |
fea3b91d | 3362 | SYSERROR("Failed to reset file descriptor offset"); |
6a49f05e | 3363 | close(memfd); |
6a49f05e CB |
3364 | return; |
3365 | } | |
3366 | ||
3367 | f = fdopen(memfd, "r"); | |
e995d7a2 | 3368 | if (!f) { |
fea3b91d DJ |
3369 | SYSERROR("Failed to open copy of \"/proc/self/mountinfo\" to mark " |
3370 | "all shared. Continuing"); | |
6a49f05e | 3371 | close(memfd); |
e995d7a2 SH |
3372 | return; |
3373 | } | |
3374 | ||
3375 | while (getline(&line, &len, f) != -1) { | |
0fd73091 CB |
3376 | int ret; |
3377 | char *opts, *target; | |
3378 | ||
e995d7a2 SH |
3379 | target = get_field(line, 4); |
3380 | if (!target) | |
3381 | continue; | |
0fd73091 | 3382 | |
e995d7a2 SH |
3383 | opts = get_field(target, 2); |
3384 | if (!opts) | |
3385 | continue; | |
0fd73091 | 3386 | |
e995d7a2 SH |
3387 | null_endofword(opts); |
3388 | if (!strstr(opts, "shared")) | |
3389 | continue; | |
0fd73091 | 3390 | |
e995d7a2 | 3391 | null_endofword(target); |
0fd73091 CB |
3392 | ret = mount(NULL, target, NULL, MS_SLAVE, NULL); |
3393 | if (ret < 0) { | |
3394 | SYSERROR("Failed to make \"%s\" MS_SLAVE", target); | |
e995d7a2 | 3395 | ERROR("Continuing..."); |
6a49f05e | 3396 | continue; |
e995d7a2 | 3397 | } |
6a49f05e | 3398 | TRACE("Remounted \"%s\" as MS_SLAVE", target); |
e995d7a2 SH |
3399 | } |
3400 | fclose(f); | |
f10fad2f | 3401 | free(line); |
6a49f05e | 3402 | TRACE("Remounted all mount table entries as MS_SLAVE"); |
e995d7a2 SH |
3403 | } |
3404 | ||
794248d0 | 3405 | static int lxc_execute_bind_init(struct lxc_handler *handler) |
2322903b SH |
3406 | { |
3407 | int ret; | |
794248d0 CB |
3408 | char *p; |
3409 | char path[PATH_MAX], destpath[PATH_MAX]; | |
3410 | struct lxc_conf *conf = handler->conf; | |
9d9c111c SH |
3411 | |
3412 | /* If init exists in the container, don't bind mount a static one */ | |
3413 | p = choose_init(conf->rootfs.mount); | |
3414 | if (p) { | |
41089848 TA |
3415 | char *old = p; |
3416 | ||
3417 | p = strdup(old + strlen(conf->rootfs.mount)); | |
3418 | free(old); | |
3419 | if (!p) | |
3420 | return -ENOMEM; | |
3421 | ||
3422 | INFO("Found existing init at \"%s\"", p); | |
3423 | goto out; | |
9d9c111c | 3424 | } |
2322903b SH |
3425 | |
3426 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
0fd73091 | 3427 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3428 | return -1; |
2322903b SH |
3429 | |
3430 | if (!file_exists(path)) { | |
0fd73091 | 3431 | ERROR("The file \"%s\" does not exist on host", path); |
8353b4c9 | 3432 | return -1; |
2322903b SH |
3433 | } |
3434 | ||
794248d0 | 3435 | ret = snprintf(destpath, PATH_MAX, "%s" P_tmpdir "%s", conf->rootfs.mount, "/.lxc-init"); |
0fd73091 | 3436 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3437 | return -1; |
2322903b SH |
3438 | |
3439 | if (!file_exists(destpath)) { | |
794248d0 CB |
3440 | ret = mknod(destpath, S_IFREG | 0000, 0); |
3441 | if (ret < 0 && errno != EEXIST) { | |
3442 | SYSERROR("Failed to create dummy \"%s\" file as bind mount target", destpath); | |
8353b4c9 | 3443 | return -1; |
2322903b | 3444 | } |
2322903b SH |
3445 | } |
3446 | ||
592fd47a | 3447 | ret = safe_mount(path, destpath, "none", MS_BIND, NULL, conf->rootfs.mount); |
8353b4c9 | 3448 | if (ret < 0) { |
0fd73091 | 3449 | SYSERROR("Failed to bind mount lxc.init.static into container"); |
8353b4c9 CB |
3450 | return -1; |
3451 | } | |
3452 | ||
794248d0 CB |
3453 | p = strdup(destpath + strlen(conf->rootfs.mount)); |
3454 | if (!p) | |
3455 | return -ENOMEM; | |
794248d0 | 3456 | |
8353b4c9 | 3457 | INFO("Bind mounted lxc.init.static into container at \"%s\"", path); |
41089848 | 3458 | out: |
4b5b3a2a | 3459 | ((struct execute_args *)handler->data)->init_fd = -1; |
41089848 | 3460 | ((struct execute_args *)handler->data)->init_path = p; |
8353b4c9 | 3461 | return 0; |
2322903b SH |
3462 | } |
3463 | ||
0fd73091 CB |
3464 | /* This does the work of remounting / if it is shared, calling the container |
3465 | * pre-mount hooks, and mounting the rootfs. | |
35120d9c | 3466 | */ |
8ce1abc2 CB |
3467 | int lxc_setup_rootfs_prepare_root(struct lxc_conf *conf, const char *name, |
3468 | const char *lxcpath) | |
0ad19a3f | 3469 | { |
0fd73091 CB |
3470 | int ret; |
3471 | ||
35120d9c | 3472 | if (conf->rootfs_setup) { |
35120d9c | 3473 | const char *path = conf->rootfs.mount; |
0fd73091 CB |
3474 | |
3475 | /* The rootfs was set up in another namespace. bind-mount it to | |
3476 | * give us a mount in our own ns so we can pivot_root to it | |
3477 | */ | |
3478 | ret = mount(path, path, "rootfs", MS_BIND, NULL); | |
3479 | if (ret < 0) { | |
3480 | ERROR("Failed to bind mount container / onto itself"); | |
145832ba | 3481 | return -1; |
35120d9c | 3482 | } |
0fd73091 CB |
3483 | |
3484 | TRACE("Bind mounted container / onto itself"); | |
145832ba | 3485 | return 0; |
35120d9c | 3486 | } |
d4ef7c50 | 3487 | |
e995d7a2 SH |
3488 | remount_all_slave(); |
3489 | ||
0fd73091 CB |
3490 | ret = run_lxc_hooks(name, "pre-mount", conf, NULL); |
3491 | if (ret < 0) { | |
3492 | ERROR("Failed to run pre-mount hooks"); | |
35120d9c SH |
3493 | return -1; |
3494 | } | |
3495 | ||
8ce1abc2 | 3496 | ret = lxc_mount_rootfs(conf); |
0fd73091 CB |
3497 | if (ret < 0) { |
3498 | ERROR("Failed to setup rootfs for"); | |
35120d9c SH |
3499 | return -1; |
3500 | } | |
3501 | ||
3502 | conf->rootfs_setup = true; | |
3503 | return 0; | |
3504 | } | |
3505 | ||
1c1c7051 SH |
3506 | static bool verify_start_hooks(struct lxc_conf *conf) |
3507 | { | |
1c1c7051 | 3508 | char path[MAXPATHLEN]; |
0fd73091 CB |
3509 | struct lxc_list *it; |
3510 | ||
3511 | lxc_list_for_each (it, &conf->hooks[LXCHOOK_START]) { | |
1c1c7051 | 3512 | int ret; |
0fd73091 CB |
3513 | struct stat st; |
3514 | char *hookname = it->elem; | |
1c1c7051 SH |
3515 | |
3516 | ret = snprintf(path, MAXPATHLEN, "%s%s", | |
0fd73091 CB |
3517 | conf->rootfs.path ? conf->rootfs.mount : "", |
3518 | hookname); | |
1c1c7051 SH |
3519 | if (ret < 0 || ret >= MAXPATHLEN) |
3520 | return false; | |
0fd73091 | 3521 | |
1c1c7051 | 3522 | ret = stat(path, &st); |
0fd73091 | 3523 | if (ret < 0) { |
7b6753e7 | 3524 | SYSERROR("Start hook %s not found in container", |
0fd73091 | 3525 | hookname); |
1c1c7051 SH |
3526 | return false; |
3527 | } | |
0fd73091 | 3528 | |
6a0c909a | 3529 | return true; |
1c1c7051 SH |
3530 | } |
3531 | ||
3532 | return true; | |
3533 | } | |
3534 | ||
4b5b3a2a TA |
3535 | static bool execveat_supported(void) |
3536 | { | |
3537 | #ifdef __NR_execveat | |
3538 | /* | |
3539 | * We use the syscall here, because it was introduced in kernel 3.19, | |
3540 | * while glibc got support for using the syscall much later, in 2.27. | |
3541 | * We don't want to use glibc because it falls back to /proc, and the | |
3542 | * container may not have /proc mounted depending on its configuration. | |
3543 | */ | |
3544 | syscall(__NR_execveat, -1, "", NULL, NULL, AT_EMPTY_PATH); | |
3545 | if (errno == ENOSYS) | |
3546 | return false; | |
3547 | ||
3548 | return true; | |
3549 | #else | |
3550 | return false; | |
3551 | #endif | |
3552 | } | |
3553 | ||
3b988b33 | 3554 | int lxc_setup(struct lxc_handler *handler) |
35120d9c | 3555 | { |
2187efd3 | 3556 | int ret; |
0fd73091 | 3557 | const char *lxcpath = handler->lxcpath, *name = handler->name; |
35120d9c | 3558 | struct lxc_conf *lxc_conf = handler->conf; |
35120d9c | 3559 | |
8ce1abc2 | 3560 | ret = lxc_setup_rootfs_prepare_root(lxc_conf, name, lxcpath); |
8353b4c9 CB |
3561 | if (ret < 0) { |
3562 | ERROR("Failed to setup rootfs"); | |
35120d9c SH |
3563 | return -1; |
3564 | } | |
3565 | ||
28d9e29e | 3566 | if (handler->nsfd[LXC_NS_UTS] == -1) { |
8353b4c9 CB |
3567 | ret = setup_utsname(lxc_conf->utsname); |
3568 | if (ret < 0) { | |
0fd73091 | 3569 | ERROR("Failed to setup the utsname %s", name); |
6c544cb3 MM |
3570 | return -1; |
3571 | } | |
0ad19a3f | 3572 | } |
3573 | ||
8353b4c9 CB |
3574 | ret = lxc_setup_network_in_child_namespaces(lxc_conf, &lxc_conf->network); |
3575 | if (ret < 0) { | |
3576 | ERROR("Failed to setup network"); | |
95b5ffaf | 3577 | return -1; |
0ad19a3f | 3578 | } |
3579 | ||
8353b4c9 CB |
3580 | ret = lxc_network_send_name_and_ifindex_to_parent(handler); |
3581 | if (ret < 0) { | |
3582 | ERROR("Failed to send network device names and ifindices to parent"); | |
790255cf CB |
3583 | return -1; |
3584 | } | |
3585 | ||
bc6928ff | 3586 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3587 | ret = mount_autodev(name, &lxc_conf->rootfs, lxcpath); |
3588 | if (ret < 0) { | |
3589 | ERROR("Failed to mount \"/dev\""); | |
c6883f38 SH |
3590 | return -1; |
3591 | } | |
3592 | } | |
3593 | ||
8353b4c9 CB |
3594 | /* Do automatic mounts (mainly /proc and /sys), but exclude those that |
3595 | * need to wait until other stuff has finished. | |
368bbc02 | 3596 | */ |
8353b4c9 CB |
3597 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler); |
3598 | if (ret < 0) { | |
3599 | ERROR("Failed to setup first automatic mounts"); | |
368bbc02 CS |
3600 | return -1; |
3601 | } | |
3602 | ||
8353b4c9 CB |
3603 | ret = setup_mount(lxc_conf, &lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath); |
3604 | if (ret < 0) { | |
3605 | ERROR("Failed to setup mounts"); | |
95b5ffaf | 3606 | return -1; |
576f946d | 3607 | } |
3608 | ||
7b6753e7 | 3609 | /* Make sure any start hooks are in the container */ |
1c1c7051 SH |
3610 | if (!verify_start_hooks(lxc_conf)) |
3611 | return -1; | |
3612 | ||
8353b4c9 | 3613 | if (lxc_conf->is_execute) { |
4b5b3a2a TA |
3614 | if (execveat_supported()) { |
3615 | int fd; | |
3616 | char path[PATH_MAX]; | |
3617 | ||
3618 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
3619 | if (ret < 0 || ret >= PATH_MAX) { | |
3620 | ERROR("Path to init.lxc.static too long"); | |
3621 | return -1; | |
3622 | } | |
3623 | ||
3624 | fd = open(path, O_PATH | O_CLOEXEC); | |
3625 | if (fd < 0) { | |
3626 | SYSERROR("Unable to open lxc.init.static"); | |
3627 | return -1; | |
3628 | } | |
3629 | ||
3630 | ((struct execute_args *)handler->data)->init_fd = fd; | |
3631 | ((struct execute_args *)handler->data)->init_path = NULL; | |
3632 | } else { | |
3633 | ret = lxc_execute_bind_init(handler); | |
3634 | if (ret < 0) { | |
3635 | ERROR("Failed to bind-mount the lxc init system"); | |
3636 | return -1; | |
3637 | } | |
8353b4c9 CB |
3638 | } |
3639 | } | |
2322903b | 3640 | |
8353b4c9 CB |
3641 | /* Now mount only cgroups, if wanted. Before, /sys could not have been |
3642 | * mounted. It is guaranteed to be mounted now either through | |
3643 | * automatically or via fstab entries. | |
368bbc02 | 3644 | */ |
8353b4c9 CB |
3645 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler); |
3646 | if (ret < 0) { | |
3647 | ERROR("Failed to setup remaining automatic mounts"); | |
368bbc02 CS |
3648 | return -1; |
3649 | } | |
3650 | ||
8353b4c9 | 3651 | ret = run_lxc_hooks(name, "mount", lxc_conf, NULL); |
1a2cf89d | 3652 | if (ret < 0) { |
8353b4c9 | 3653 | ERROR("Failed to run mount hooks"); |
773fb9ca SH |
3654 | return -1; |
3655 | } | |
3656 | ||
bc6928ff | 3657 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3658 | ret = run_lxc_hooks(name, "autodev", lxc_conf, NULL); |
3659 | if (ret < 0) { | |
3660 | ERROR("Failed to run autodev hooks"); | |
f7bee6c6 MW |
3661 | return -1; |
3662 | } | |
06749971 | 3663 | |
8353b4c9 CB |
3664 | ret = lxc_fill_autodev(&lxc_conf->rootfs); |
3665 | if (ret < 0) { | |
3666 | ERROR("Failed to populate \"/dev\""); | |
91c3830e SH |
3667 | return -1; |
3668 | } | |
3669 | } | |
368bbc02 | 3670 | |
8353b4c9 CB |
3671 | if (!lxc_list_empty(&lxc_conf->mount_list)) { |
3672 | ret = setup_mount_entries(lxc_conf, &lxc_conf->rootfs, | |
3673 | &lxc_conf->mount_list, name, lxcpath); | |
3674 | if (ret < 0) { | |
3675 | ERROR("Failed to setup mount entries"); | |
3676 | return -1; | |
3677 | } | |
181437fd YT |
3678 | } |
3679 | ||
ed8704d0 | 3680 | ret = lxc_setup_console(&lxc_conf->rootfs, &lxc_conf->console, |
885766f5 | 3681 | lxc_conf->ttys.dir); |
ed8704d0 CB |
3682 | if (ret < 0) { |
3683 | ERROR("Failed to setup console"); | |
95b5ffaf | 3684 | return -1; |
6e590161 | 3685 | } |
3686 | ||
ed8704d0 CB |
3687 | ret = lxc_setup_dev_symlinks(&lxc_conf->rootfs); |
3688 | if (ret < 0) { | |
8353b4c9 | 3689 | ERROR("Failed to setup \"/dev\" symlinks"); |
69aa6655 DE |
3690 | return -1; |
3691 | } | |
3692 | ||
8353b4c9 CB |
3693 | ret = lxc_create_tmp_proc_mount(lxc_conf); |
3694 | if (ret < 0) { | |
3695 | ERROR("Failed to \"/proc\" LSMs"); | |
e075f5d9 | 3696 | return -1; |
e075f5d9 | 3697 | } |
e075f5d9 | 3698 | |
8ce1abc2 | 3699 | ret = lxc_setup_rootfs_switch_root(&lxc_conf->rootfs); |
8353b4c9 CB |
3700 | if (ret < 0) { |
3701 | ERROR("Failed to pivot root into rootfs"); | |
95b5ffaf | 3702 | return -1; |
ed502555 | 3703 | } |
3704 | ||
8353b4c9 CB |
3705 | ret = lxc_setup_devpts(lxc_conf); |
3706 | if (ret < 0) { | |
3707 | ERROR("Failed to setup new devpts instance"); | |
95b5ffaf | 3708 | return -1; |
3c26f34e | 3709 | } |
3710 | ||
2187efd3 CB |
3711 | ret = lxc_create_ttys(handler); |
3712 | if (ret < 0) | |
e8bd4e43 | 3713 | return -1; |
e8bd4e43 | 3714 | |
8353b4c9 CB |
3715 | ret = setup_personality(lxc_conf->personality); |
3716 | if (ret < 0) { | |
3717 | ERROR("Failed to set personality"); | |
cccc74b5 DL |
3718 | return -1; |
3719 | } | |
3720 | ||
8353b4c9 CB |
3721 | /* Set sysctl value to a path under /proc/sys as determined from the |
3722 | * key. For e.g. net.ipv4.ip_forward translated to | |
3723 | * /proc/sys/net/ipv4/ip_forward. | |
7edd0540 L |
3724 | */ |
3725 | if (!lxc_list_empty(&lxc_conf->sysctls)) { | |
3726 | ret = setup_sysctl_parameters(&lxc_conf->sysctls); | |
8353b4c9 CB |
3727 | if (ret < 0) { |
3728 | ERROR("Failed to setup sysctl parameters"); | |
7edd0540 | 3729 | return -1; |
8353b4c9 | 3730 | } |
7edd0540 L |
3731 | } |
3732 | ||
97a8f74f SG |
3733 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
3734 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
8353b4c9 CB |
3735 | ERROR("Container requests lxc.cap.drop and " |
3736 | "lxc.cap.keep: either use lxc.cap.drop or " | |
3737 | "lxc.cap.keep, not both"); | |
f6d3e3e4 SH |
3738 | return -1; |
3739 | } | |
8353b4c9 | 3740 | |
97a8f74f | 3741 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
8353b4c9 | 3742 | ERROR("Failed to keep capabilities"); |
97a8f74f SG |
3743 | return -1; |
3744 | } | |
3745 | } else if (setup_caps(&lxc_conf->caps)) { | |
8353b4c9 | 3746 | ERROR("Failed to drop capabilities"); |
97a8f74f | 3747 | return -1; |
81810dd1 DL |
3748 | } |
3749 | ||
8353b4c9 | 3750 | NOTICE("The container \"%s\" is set up", name); |
cd54d859 | 3751 | |
0ad19a3f | 3752 | return 0; |
3753 | } | |
26ddeedd | 3754 | |
3f60c2f7 | 3755 | int run_lxc_hooks(const char *name, char *hookname, struct lxc_conf *conf, |
14a7b0f9 | 3756 | char *argv[]) |
26ddeedd | 3757 | { |
26ddeedd | 3758 | struct lxc_list *it; |
3f60c2f7 | 3759 | int which = -1; |
26ddeedd | 3760 | |
3f60c2f7 | 3761 | if (strcmp(hookname, "pre-start") == 0) |
26ddeedd | 3762 | which = LXCHOOK_PRESTART; |
3f60c2f7 | 3763 | else if (strcmp(hookname, "start-host") == 0) |
08dd2805 | 3764 | which = LXCHOOK_START_HOST; |
3f60c2f7 | 3765 | else if (strcmp(hookname, "pre-mount") == 0) |
5ea6163a | 3766 | which = LXCHOOK_PREMOUNT; |
3f60c2f7 | 3767 | else if (strcmp(hookname, "mount") == 0) |
26ddeedd | 3768 | which = LXCHOOK_MOUNT; |
3f60c2f7 | 3769 | else if (strcmp(hookname, "autodev") == 0) |
f7bee6c6 | 3770 | which = LXCHOOK_AUTODEV; |
3f60c2f7 | 3771 | else if (strcmp(hookname, "start") == 0) |
26ddeedd | 3772 | which = LXCHOOK_START; |
3f60c2f7 | 3773 | else if (strcmp(hookname, "stop") == 0) |
52492063 | 3774 | which = LXCHOOK_STOP; |
3f60c2f7 | 3775 | else if (strcmp(hookname, "post-stop") == 0) |
26ddeedd | 3776 | which = LXCHOOK_POSTSTOP; |
3f60c2f7 | 3777 | else if (strcmp(hookname, "clone") == 0) |
148e91f5 | 3778 | which = LXCHOOK_CLONE; |
3f60c2f7 | 3779 | else if (strcmp(hookname, "destroy") == 0) |
37cf711b | 3780 | which = LXCHOOK_DESTROY; |
26ddeedd SH |
3781 | else |
3782 | return -1; | |
3f60c2f7 | 3783 | |
0fd73091 | 3784 | lxc_list_for_each (it, &conf->hooks[which]) { |
26ddeedd | 3785 | int ret; |
3f60c2f7 CB |
3786 | char *hook = it->elem; |
3787 | ||
3788 | ret = run_script_argv(name, conf->hooks_version, "lxc", hook, | |
14a7b0f9 | 3789 | hookname, argv); |
3f60c2f7 CB |
3790 | if (ret < 0) |
3791 | return -1; | |
26ddeedd | 3792 | } |
3f60c2f7 | 3793 | |
26ddeedd SH |
3794 | return 0; |
3795 | } | |
72d0e1cb | 3796 | |
72d0e1cb SG |
3797 | int lxc_clear_config_caps(struct lxc_conf *c) |
3798 | { | |
1a0e70ac | 3799 | struct lxc_list *it, *next; |
72d0e1cb | 3800 | |
0fd73091 | 3801 | lxc_list_for_each_safe (it, &c->caps, next) { |
72d0e1cb SG |
3802 | lxc_list_del(it); |
3803 | free(it->elem); | |
3804 | free(it); | |
3805 | } | |
0fd73091 | 3806 | |
72d0e1cb SG |
3807 | return 0; |
3808 | } | |
3809 | ||
c7e345ae CB |
3810 | static int lxc_free_idmap(struct lxc_list *id_map) |
3811 | { | |
27c27d73 SH |
3812 | struct lxc_list *it, *next; |
3813 | ||
0fd73091 | 3814 | lxc_list_for_each_safe (it, id_map, next) { |
27c27d73 SH |
3815 | lxc_list_del(it); |
3816 | free(it->elem); | |
3817 | free(it); | |
3818 | } | |
c7e345ae | 3819 | |
27c27d73 SH |
3820 | return 0; |
3821 | } | |
3822 | ||
4355ab5f SH |
3823 | int lxc_clear_idmaps(struct lxc_conf *c) |
3824 | { | |
3825 | return lxc_free_idmap(&c->id_map); | |
3826 | } | |
3827 | ||
1fb86a7c SH |
3828 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
3829 | { | |
0fd73091 | 3830 | struct lxc_list *it, *next; |
1fb86a7c | 3831 | |
0fd73091 | 3832 | lxc_list_for_each_safe (it, &c->keepcaps, next) { |
1fb86a7c SH |
3833 | lxc_list_del(it); |
3834 | free(it->elem); | |
3835 | free(it); | |
3836 | } | |
0fd73091 | 3837 | |
1fb86a7c SH |
3838 | return 0; |
3839 | } | |
3840 | ||
54860ed0 | 3841 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version) |
72d0e1cb | 3842 | { |
54860ed0 | 3843 | char *global_token, *namespaced_token; |
ab1a6cac | 3844 | size_t namespaced_token_len; |
54860ed0 | 3845 | struct lxc_list *it, *next, *list; |
ab1a6cac | 3846 | const char *k = key; |
54860ed0 | 3847 | bool all = false; |
72d0e1cb | 3848 | |
54860ed0 CB |
3849 | if (version == CGROUP2_SUPER_MAGIC) { |
3850 | global_token = "lxc.cgroup2"; | |
3851 | namespaced_token = "lxc.cgroup2."; | |
0fd73091 | 3852 | namespaced_token_len = sizeof("lxc.cgroup2.") - 1; |
54860ed0 CB |
3853 | list = &c->cgroup2; |
3854 | } else if (version == CGROUP_SUPER_MAGIC) { | |
3855 | global_token = "lxc.cgroup"; | |
3856 | namespaced_token = "lxc.cgroup."; | |
0fd73091 | 3857 | namespaced_token_len = sizeof("lxc.cgroup.") - 1; |
54860ed0 CB |
3858 | list = &c->cgroup; |
3859 | } else { | |
ab1a6cac | 3860 | return -EINVAL; |
54860ed0 CB |
3861 | } |
3862 | ||
3863 | if (strcmp(key, global_token) == 0) | |
72d0e1cb | 3864 | all = true; |
54860ed0 | 3865 | else if (strncmp(key, namespaced_token, sizeof(namespaced_token) - 1) == 0) |
ab1a6cac | 3866 | k += namespaced_token_len; |
a6390f01 | 3867 | else |
ab1a6cac | 3868 | return -EINVAL; |
72d0e1cb | 3869 | |
0fd73091 | 3870 | lxc_list_for_each_safe (it, list, next) { |
72d0e1cb | 3871 | struct lxc_cgroup *cg = it->elem; |
54860ed0 | 3872 | |
72d0e1cb SG |
3873 | if (!all && strcmp(cg->subsystem, k) != 0) |
3874 | continue; | |
54860ed0 | 3875 | |
72d0e1cb SG |
3876 | lxc_list_del(it); |
3877 | free(cg->subsystem); | |
3878 | free(cg->value); | |
3879 | free(cg); | |
3880 | free(it); | |
3881 | } | |
e409b214 | 3882 | |
72d0e1cb SG |
3883 | return 0; |
3884 | } | |
3885 | ||
c6d09e15 WB |
3886 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
3887 | { | |
3888 | struct lxc_list *it, *next; | |
c6d09e15 | 3889 | const char *k = NULL; |
0fd73091 | 3890 | bool all = false; |
c6d09e15 | 3891 | |
b668653c | 3892 | if (strcmp(key, "lxc.limit") == 0 || strcmp(key, "lxc.prlimit") == 0) |
c6d09e15 | 3893 | all = true; |
b668653c CB |
3894 | else if (strncmp(key, "lxc.limit.", sizeof("lxc.limit.") - 1) == 0) |
3895 | k = key + sizeof("lxc.limit.") - 1; | |
3896 | else if (strncmp(key, "lxc.prlimit.", sizeof("lxc.prlimit.") - 1) == 0) | |
3897 | k = key + sizeof("lxc.prlimit.") - 1; | |
c6d09e15 WB |
3898 | else |
3899 | return -1; | |
3900 | ||
0fd73091 | 3901 | lxc_list_for_each_safe (it, &c->limits, next) { |
c6d09e15 | 3902 | struct lxc_limit *lim = it->elem; |
0fd73091 | 3903 | |
c6d09e15 WB |
3904 | if (!all && strcmp(lim->resource, k) != 0) |
3905 | continue; | |
0fd73091 | 3906 | |
c6d09e15 WB |
3907 | lxc_list_del(it); |
3908 | free(lim->resource); | |
3909 | free(lim); | |
3910 | free(it); | |
3911 | } | |
b668653c | 3912 | |
c6d09e15 WB |
3913 | return 0; |
3914 | } | |
3915 | ||
7edd0540 L |
3916 | int lxc_clear_sysctls(struct lxc_conf *c, const char *key) |
3917 | { | |
3918 | struct lxc_list *it, *next; | |
7edd0540 | 3919 | const char *k = NULL; |
0fd73091 | 3920 | bool all = false; |
7edd0540 L |
3921 | |
3922 | if (strcmp(key, "lxc.sysctl") == 0) | |
3923 | all = true; | |
3924 | else if (strncmp(key, "lxc.sysctl.", sizeof("lxc.sysctl.") - 1) == 0) | |
3925 | k = key + sizeof("lxc.sysctl.") - 1; | |
3926 | else | |
3927 | return -1; | |
3928 | ||
0fd73091 | 3929 | lxc_list_for_each_safe (it, &c->sysctls, next) { |
7edd0540 | 3930 | struct lxc_sysctl *elem = it->elem; |
0fd73091 | 3931 | |
7edd0540 L |
3932 | if (!all && strcmp(elem->key, k) != 0) |
3933 | continue; | |
0fd73091 | 3934 | |
7edd0540 L |
3935 | lxc_list_del(it); |
3936 | free(elem->key); | |
3937 | free(elem->value); | |
3938 | free(elem); | |
3939 | free(it); | |
3940 | } | |
0fd73091 | 3941 | |
7edd0540 L |
3942 | return 0; |
3943 | } | |
3944 | ||
61d7a733 YT |
3945 | int lxc_clear_procs(struct lxc_conf *c, const char *key) |
3946 | { | |
0fd73091 | 3947 | struct lxc_list *it, *next; |
61d7a733 | 3948 | const char *k = NULL; |
0fd73091 | 3949 | bool all = false; |
61d7a733 YT |
3950 | |
3951 | if (strcmp(key, "lxc.proc") == 0) | |
3952 | all = true; | |
3953 | else if (strncmp(key, "lxc.proc.", sizeof("lxc.proc.") - 1) == 0) | |
3954 | k = key + sizeof("lxc.proc.") - 1; | |
3955 | else | |
3956 | return -1; | |
3957 | ||
0fd73091 | 3958 | lxc_list_for_each_safe (it, &c->procs, next) { |
61d7a733 | 3959 | struct lxc_proc *proc = it->elem; |
0fd73091 | 3960 | |
61d7a733 YT |
3961 | if (!all && strcmp(proc->filename, k) != 0) |
3962 | continue; | |
0fd73091 | 3963 | |
61d7a733 YT |
3964 | lxc_list_del(it); |
3965 | free(proc->filename); | |
3966 | free(proc->value); | |
3967 | free(proc); | |
3968 | free(it); | |
3969 | } | |
3970 | ||
3971 | return 0; | |
3972 | } | |
3973 | ||
ee1e7aa0 SG |
3974 | int lxc_clear_groups(struct lxc_conf *c) |
3975 | { | |
0fd73091 | 3976 | struct lxc_list *it, *next; |
ee1e7aa0 | 3977 | |
0fd73091 | 3978 | lxc_list_for_each_safe (it, &c->groups, next) { |
ee1e7aa0 SG |
3979 | lxc_list_del(it); |
3980 | free(it->elem); | |
3981 | free(it); | |
3982 | } | |
0fd73091 | 3983 | |
ee1e7aa0 SG |
3984 | return 0; |
3985 | } | |
3986 | ||
ab799c0b SG |
3987 | int lxc_clear_environment(struct lxc_conf *c) |
3988 | { | |
0fd73091 | 3989 | struct lxc_list *it, *next; |
ab799c0b | 3990 | |
0fd73091 | 3991 | lxc_list_for_each_safe (it, &c->environment, next) { |
ab799c0b SG |
3992 | lxc_list_del(it); |
3993 | free(it->elem); | |
3994 | free(it); | |
3995 | } | |
0fd73091 | 3996 | |
ab799c0b SG |
3997 | return 0; |
3998 | } | |
3999 | ||
72d0e1cb SG |
4000 | int lxc_clear_mount_entries(struct lxc_conf *c) |
4001 | { | |
0fd73091 | 4002 | struct lxc_list *it, *next; |
72d0e1cb | 4003 | |
0fd73091 | 4004 | lxc_list_for_each_safe (it, &c->mount_list, next) { |
72d0e1cb SG |
4005 | lxc_list_del(it); |
4006 | free(it->elem); | |
4007 | free(it); | |
4008 | } | |
0fd73091 | 4009 | |
72d0e1cb SG |
4010 | return 0; |
4011 | } | |
4012 | ||
b099e9e9 SH |
4013 | int lxc_clear_automounts(struct lxc_conf *c) |
4014 | { | |
4015 | c->auto_mounts = 0; | |
4016 | return 0; | |
4017 | } | |
4018 | ||
12a50cc6 | 4019 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 4020 | { |
72d0e1cb | 4021 | int i; |
0fd73091 CB |
4022 | struct lxc_list *it, *next; |
4023 | const char *k = NULL; | |
4024 | bool all = false, done = false; | |
72d0e1cb | 4025 | |
17ed13a3 SH |
4026 | if (strcmp(key, "lxc.hook") == 0) |
4027 | all = true; | |
0fd73091 CB |
4028 | else if (strncmp(key, "lxc.hook.", sizeof("lxc.hook.") - 1) == 0) |
4029 | k = key + sizeof("lxc.hook.") - 1; | |
a6390f01 WB |
4030 | else |
4031 | return -1; | |
17ed13a3 | 4032 | |
0fd73091 | 4033 | for (i = 0; i < NUM_LXC_HOOKS; i++) { |
17ed13a3 | 4034 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
0fd73091 | 4035 | lxc_list_for_each_safe (it, &c->hooks[i], next) { |
17ed13a3 SH |
4036 | lxc_list_del(it); |
4037 | free(it->elem); | |
4038 | free(it); | |
4039 | } | |
0fd73091 | 4040 | |
17ed13a3 | 4041 | done = true; |
72d0e1cb SG |
4042 | } |
4043 | } | |
17ed13a3 SH |
4044 | |
4045 | if (!done) { | |
4046 | ERROR("Invalid hook key: %s", key); | |
4047 | return -1; | |
4048 | } | |
0fd73091 | 4049 | |
72d0e1cb SG |
4050 | return 0; |
4051 | } | |
8eb5694b | 4052 | |
4184c3e1 SH |
4053 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
4054 | { | |
0fd73091 | 4055 | struct lxc_list *it, *next; |
4184c3e1 | 4056 | |
0fd73091 | 4057 | lxc_list_for_each_safe (it, &conf->aliens, next) { |
4184c3e1 SH |
4058 | lxc_list_del(it); |
4059 | free(it->elem); | |
4060 | free(it); | |
4061 | } | |
4062 | } | |
4063 | ||
c7b15d1e | 4064 | void lxc_clear_includes(struct lxc_conf *conf) |
f979ac15 | 4065 | { |
0fd73091 | 4066 | struct lxc_list *it, *next; |
f979ac15 | 4067 | |
0fd73091 | 4068 | lxc_list_for_each_safe (it, &conf->includes, next) { |
f979ac15 SH |
4069 | lxc_list_del(it); |
4070 | free(it->elem); | |
4071 | free(it); | |
4072 | } | |
4073 | } | |
4074 | ||
1800f924 WB |
4075 | int lxc_clear_apparmor_raw(struct lxc_conf *c) |
4076 | { | |
4077 | struct lxc_list *it, *next; | |
4078 | ||
4079 | lxc_list_for_each_safe (it, &c->lsm_aa_raw, next) { | |
4080 | lxc_list_del(it); | |
4081 | free(it->elem); | |
4082 | free(it); | |
4083 | } | |
4084 | ||
4085 | return 0; | |
4086 | } | |
4087 | ||
8eb5694b SH |
4088 | void lxc_conf_free(struct lxc_conf *conf) |
4089 | { | |
4090 | if (!conf) | |
4091 | return; | |
0fd73091 | 4092 | |
858377e4 SH |
4093 | if (current_config == conf) |
4094 | current_config = NULL; | |
aed105d5 | 4095 | lxc_terminal_conf_free(&conf->console); |
f10fad2f | 4096 | free(conf->rootfs.mount); |
b3b8c97f | 4097 | free(conf->rootfs.bdev_type); |
f10fad2f ME |
4098 | free(conf->rootfs.options); |
4099 | free(conf->rootfs.path); | |
f10fad2f | 4100 | free(conf->logfile); |
858377e4 SH |
4101 | if (conf->logfd != -1) |
4102 | close(conf->logfd); | |
f10fad2f | 4103 | free(conf->utsname); |
885766f5 CB |
4104 | free(conf->ttys.dir); |
4105 | free(conf->ttys.tty_names); | |
f10fad2f ME |
4106 | free(conf->fstab); |
4107 | free(conf->rcfile); | |
5cda27c1 | 4108 | free(conf->execute_cmd); |
f10fad2f | 4109 | free(conf->init_cmd); |
3c491553 | 4110 | free(conf->init_cwd); |
6b0d5538 | 4111 | free(conf->unexpanded_config); |
76d0127f | 4112 | free(conf->syslog); |
c302b476 | 4113 | lxc_free_networks(&conf->network); |
f10fad2f | 4114 | free(conf->lsm_aa_profile); |
1800f924 | 4115 | free(conf->lsm_aa_profile_computed); |
f10fad2f | 4116 | free(conf->lsm_se_context); |
769872f9 | 4117 | lxc_seccomp_free(conf); |
8eb5694b | 4118 | lxc_clear_config_caps(conf); |
1fb86a7c | 4119 | lxc_clear_config_keepcaps(conf); |
54860ed0 CB |
4120 | lxc_clear_cgroups(conf, "lxc.cgroup", CGROUP_SUPER_MAGIC); |
4121 | lxc_clear_cgroups(conf, "lxc.cgroup2", CGROUP2_SUPER_MAGIC); | |
17ed13a3 | 4122 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 4123 | lxc_clear_mount_entries(conf); |
27c27d73 | 4124 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 4125 | lxc_clear_groups(conf); |
f979ac15 | 4126 | lxc_clear_includes(conf); |
761d81ca | 4127 | lxc_clear_aliens(conf); |
ab799c0b | 4128 | lxc_clear_environment(conf); |
240d4b74 | 4129 | lxc_clear_limits(conf, "lxc.prlimit"); |
7edd0540 | 4130 | lxc_clear_sysctls(conf, "lxc.sysctl"); |
61d7a733 | 4131 | lxc_clear_procs(conf, "lxc.proc"); |
1800f924 | 4132 | lxc_clear_apparmor_raw(conf); |
43654d34 CB |
4133 | free(conf->cgroup_meta.dir); |
4134 | free(conf->cgroup_meta.controllers); | |
7a41e857 LT |
4135 | free(conf->shmount.path_host); |
4136 | free(conf->shmount.path_cont); | |
8eb5694b SH |
4137 | free(conf); |
4138 | } | |
4355ab5f SH |
4139 | |
4140 | struct userns_fn_data { | |
4141 | int (*fn)(void *); | |
c9b7c33e | 4142 | const char *fn_name; |
4355ab5f SH |
4143 | void *arg; |
4144 | int p[2]; | |
4145 | }; | |
4146 | ||
4147 | static int run_userns_fn(void *data) | |
4148 | { | |
adaffdd7 | 4149 | int ret; |
4355ab5f | 4150 | char c; |
0fd73091 | 4151 | struct userns_fn_data *d = data; |
4355ab5f | 4152 | |
f8aa4bf3 | 4153 | /* Close write end of the pipe. */ |
4355ab5f | 4154 | close(d->p[1]); |
f8aa4bf3 CB |
4155 | |
4156 | /* Wait for parent to finish establishing a new mapping in the user | |
4157 | * namespace we are executing in. | |
4158 | */ | |
adaffdd7 | 4159 | ret = lxc_read_nointr(d->p[0], &c, 1); |
f8aa4bf3 | 4160 | /* Close read end of the pipe. */ |
4355ab5f | 4161 | close(d->p[0]); |
adaffdd7 CB |
4162 | if (ret != 1) |
4163 | return -1; | |
f8aa4bf3 | 4164 | |
c9b7c33e | 4165 | if (d->fn_name) |
adaffdd7 | 4166 | TRACE("Calling function \"%s\"", d->fn_name); |
0fd73091 | 4167 | |
f8aa4bf3 | 4168 | /* Call function to run. */ |
4355ab5f SH |
4169 | return d->fn(d->arg); |
4170 | } | |
4171 | ||
db7cfe23 CB |
4172 | static struct id_map *mapped_nsid_add(struct lxc_conf *conf, unsigned id, |
4173 | enum idtype idtype) | |
4174 | { | |
5173b710 CB |
4175 | const struct id_map *map; |
4176 | struct id_map *retmap; | |
db7cfe23 CB |
4177 | |
4178 | map = find_mapped_nsid_entry(conf, id, idtype); | |
4179 | if (!map) | |
4180 | return NULL; | |
4181 | ||
4182 | retmap = malloc(sizeof(*retmap)); | |
4183 | if (!retmap) | |
4184 | return NULL; | |
4185 | ||
4186 | memcpy(retmap, map, sizeof(*retmap)); | |
4187 | return retmap; | |
4188 | } | |
4189 | ||
c4333195 CB |
4190 | static struct id_map *find_mapped_hostid_entry(struct lxc_conf *conf, |
4191 | unsigned id, enum idtype idtype) | |
f8aa4bf3 | 4192 | { |
f8aa4bf3 | 4193 | struct id_map *map; |
0fd73091 | 4194 | struct lxc_list *it; |
f8aa4bf3 CB |
4195 | struct id_map *retmap = NULL; |
4196 | ||
0fd73091 | 4197 | lxc_list_for_each (it, &conf->id_map) { |
f8aa4bf3 CB |
4198 | map = it->elem; |
4199 | if (map->idtype != idtype) | |
4200 | continue; | |
4201 | ||
4202 | if (id >= map->hostid && id < map->hostid + map->range) { | |
4203 | retmap = map; | |
4204 | break; | |
4205 | } | |
4206 | } | |
4207 | ||
f8aa4bf3 CB |
4208 | return retmap; |
4209 | } | |
4210 | ||
0fd73091 | 4211 | /* Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
f8aa4bf3 | 4212 | * existing one or establish a new one. |
4355ab5f | 4213 | */ |
0fd73091 CB |
4214 | static struct id_map *mapped_hostid_add(struct lxc_conf *conf, uid_t id, |
4215 | enum idtype type) | |
4355ab5f | 4216 | { |
28a2d9e7 | 4217 | int hostid_mapped; |
c4333195 CB |
4218 | struct id_map *entry = NULL, *tmp = NULL; |
4219 | ||
4220 | entry = malloc(sizeof(*entry)); | |
4221 | if (!entry) | |
4222 | return NULL; | |
f8aa4bf3 | 4223 | |
28a2d9e7 | 4224 | /* Reuse existing mapping. */ |
c4333195 CB |
4225 | tmp = find_mapped_hostid_entry(conf, id, type); |
4226 | if (tmp) | |
4227 | return memcpy(entry, tmp, sizeof(*entry)); | |
f8aa4bf3 | 4228 | |
28a2d9e7 CB |
4229 | /* Find new mapping. */ |
4230 | hostid_mapped = find_unmapped_nsid(conf, type); | |
4231 | if (hostid_mapped < 0) { | |
c4333195 CB |
4232 | DEBUG("Failed to find free mapping for id %d", id); |
4233 | free(entry); | |
28a2d9e7 | 4234 | return NULL; |
f8aa4bf3 | 4235 | } |
f8aa4bf3 | 4236 | |
28a2d9e7 CB |
4237 | entry->idtype = type; |
4238 | entry->nsid = hostid_mapped; | |
4239 | entry->hostid = (unsigned long)id; | |
4240 | entry->range = 1; | |
4355ab5f | 4241 | |
28a2d9e7 | 4242 | return entry; |
4355ab5f SH |
4243 | } |
4244 | ||
dcf0ffdf | 4245 | struct lxc_list *get_minimal_idmap(struct lxc_conf *conf) |
4355ab5f | 4246 | { |
f8aa4bf3 | 4247 | uid_t euid, egid; |
4160c3a0 CB |
4248 | uid_t nsuid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; |
4249 | gid_t nsgid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
f8aa4bf3 | 4250 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
28a2d9e7 CB |
4251 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, |
4252 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4355ab5f | 4253 | |
db7cfe23 | 4254 | /* Find container root mappings. */ |
4160c3a0 | 4255 | container_root_uid = mapped_nsid_add(conf, nsuid, ID_TYPE_UID); |
db7cfe23 | 4256 | if (!container_root_uid) { |
dcf0ffdf | 4257 | DEBUG("Failed to find mapping for namespace uid %d", 0); |
db7cfe23 | 4258 | goto on_error; |
f8aa4bf3 | 4259 | } |
dcf0ffdf CB |
4260 | euid = geteuid(); |
4261 | if (euid >= container_root_uid->hostid && | |
4262 | euid < (container_root_uid->hostid + container_root_uid->range)) | |
db7cfe23 | 4263 | host_uid_map = container_root_uid; |
f8aa4bf3 | 4264 | |
4160c3a0 | 4265 | container_root_gid = mapped_nsid_add(conf, nsgid, ID_TYPE_GID); |
db7cfe23 | 4266 | if (!container_root_gid) { |
dcf0ffdf | 4267 | DEBUG("Failed to find mapping for namespace gid %d", 0); |
f8aa4bf3 CB |
4268 | goto on_error; |
4269 | } | |
dcf0ffdf CB |
4270 | egid = getegid(); |
4271 | if (egid >= container_root_gid->hostid && | |
4272 | egid < (container_root_gid->hostid + container_root_gid->range)) | |
db7cfe23 | 4273 | host_gid_map = container_root_gid; |
f8aa4bf3 CB |
4274 | |
4275 | /* Check whether the {g,u}id of the user has a mapping. */ | |
954b7d9b | 4276 | if (!host_uid_map) |
c4333195 | 4277 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
28a2d9e7 | 4278 | if (!host_uid_map) { |
db7cfe23 | 4279 | DEBUG("Failed to find mapping for uid %d", euid); |
f8aa4bf3 CB |
4280 | goto on_error; |
4281 | } | |
4282 | ||
dcf0ffdf CB |
4283 | if (!host_gid_map) |
4284 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); | |
28a2d9e7 | 4285 | if (!host_gid_map) { |
db7cfe23 | 4286 | DEBUG("Failed to find mapping for gid %d", egid); |
28a2d9e7 CB |
4287 | goto on_error; |
4288 | } | |
4289 | ||
4290 | /* Allocate new {g,u}id map list. */ | |
4291 | idmap = malloc(sizeof(*idmap)); | |
4292 | if (!idmap) | |
4293 | goto on_error; | |
4294 | lxc_list_init(idmap); | |
4295 | ||
f8aa4bf3 CB |
4296 | /* Add container root to the map. */ |
4297 | tmplist = malloc(sizeof(*tmplist)); | |
4298 | if (!tmplist) | |
4299 | goto on_error; | |
4300 | lxc_list_add_elem(tmplist, container_root_uid); | |
4301 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4302 | |
1d90e064 | 4303 | if (host_uid_map && (host_uid_map != container_root_uid)) { |
28a2d9e7 CB |
4304 | /* idmap will now keep track of that memory. */ |
4305 | container_root_uid = NULL; | |
4306 | ||
4307 | /* Add container root to the map. */ | |
4308 | tmplist = malloc(sizeof(*tmplist)); | |
4309 | if (!tmplist) | |
4310 | goto on_error; | |
4311 | lxc_list_add_elem(tmplist, host_uid_map); | |
4312 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4313 | } |
1d90e064 CB |
4314 | /* idmap will now keep track of that memory. */ |
4315 | container_root_uid = NULL; | |
4316 | /* idmap will now keep track of that memory. */ | |
4317 | host_uid_map = NULL; | |
f8aa4bf3 CB |
4318 | |
4319 | tmplist = malloc(sizeof(*tmplist)); | |
4320 | if (!tmplist) | |
4321 | goto on_error; | |
4322 | lxc_list_add_elem(tmplist, container_root_gid); | |
4323 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4324 | |
1d90e064 | 4325 | if (host_gid_map && (host_gid_map != container_root_gid)) { |
28a2d9e7 CB |
4326 | /* idmap will now keep track of that memory. */ |
4327 | container_root_gid = NULL; | |
4328 | ||
4329 | tmplist = malloc(sizeof(*tmplist)); | |
4330 | if (!tmplist) | |
4331 | goto on_error; | |
4332 | lxc_list_add_elem(tmplist, host_gid_map); | |
4333 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4334 | } |
1d90e064 CB |
4335 | /* idmap will now keep track of that memory. */ |
4336 | container_root_gid = NULL; | |
4337 | /* idmap will now keep track of that memory. */ | |
4338 | host_gid_map = NULL; | |
f8aa4bf3 | 4339 | |
dcf0ffdf CB |
4340 | TRACE("Allocated minimal idmapping"); |
4341 | return idmap; | |
4342 | ||
4343 | on_error: | |
4dc41f99 | 4344 | if (idmap) { |
dcf0ffdf | 4345 | lxc_free_idmap(idmap); |
4dc41f99 SX |
4346 | free(idmap); |
4347 | } | |
dcf0ffdf CB |
4348 | if (container_root_uid) |
4349 | free(container_root_uid); | |
4350 | if (container_root_gid) | |
4351 | free(container_root_gid); | |
4352 | if (host_uid_map && (host_uid_map != container_root_uid)) | |
4353 | free(host_uid_map); | |
4354 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4355 | free(host_gid_map); | |
4356 | ||
4357 | return NULL; | |
4358 | } | |
4359 | ||
4360 | /* Run a function in a new user namespace. | |
4361 | * The caller's euid/egid will be mapped if it is not already. | |
4362 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
4363 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
4364 | * This means we require only to establish a mapping from: | |
4365 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
4366 | * - the container root -> some sub{g,u}id | |
4367 | * The former we add, if the user did not specifiy a mapping. The latter we | |
4368 | * retrieve from the ontainer's configured {g,u}id mappings as it must have been | |
4369 | * there to start the container in the first place. | |
4370 | */ | |
4371 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data, | |
4372 | const char *fn_name) | |
4373 | { | |
4374 | pid_t pid; | |
dcf0ffdf | 4375 | int p[2]; |
0fd73091 | 4376 | struct userns_fn_data d; |
dcf0ffdf | 4377 | struct lxc_list *idmap; |
0fd73091 CB |
4378 | int ret = -1, status = -1; |
4379 | char c = '1'; | |
dcf0ffdf | 4380 | |
2b2655a8 CB |
4381 | if (!conf) |
4382 | return -EINVAL; | |
4383 | ||
dcf0ffdf CB |
4384 | idmap = get_minimal_idmap(conf); |
4385 | if (!idmap) | |
4386 | return -1; | |
4387 | ||
979f9e34 | 4388 | ret = pipe2(p, O_CLOEXEC); |
dcf0ffdf CB |
4389 | if (ret < 0) { |
4390 | SYSERROR("Failed to create pipe"); | |
4391 | return -1; | |
4392 | } | |
4393 | d.fn = fn; | |
4394 | d.fn_name = fn_name; | |
4395 | d.arg = data; | |
4396 | d.p[0] = p[0]; | |
4397 | d.p[1] = p[1]; | |
4398 | ||
4399 | /* Clone child in new user namespace. */ | |
4400 | pid = lxc_raw_clone_cb(run_userns_fn, &d, CLONE_NEWUSER); | |
4401 | if (pid < 0) { | |
0fd73091 | 4402 | ERROR("Failed to clone process in new user namespace"); |
dcf0ffdf CB |
4403 | goto on_error; |
4404 | } | |
4405 | ||
4406 | close(p[0]); | |
4407 | p[0] = -1; | |
4408 | ||
4b73005c CB |
4409 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || |
4410 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
dcf0ffdf | 4411 | struct id_map *map; |
0fd73091 | 4412 | struct lxc_list *it; |
dcf0ffdf | 4413 | |
0fd73091 | 4414 | lxc_list_for_each (it, idmap) { |
f8aa4bf3 | 4415 | map = it->elem; |
dcf0ffdf | 4416 | TRACE("Establishing %cid mapping for \"%d\" in new " |
f8aa4bf3 | 4417 | "user namespace: nsuid %lu - hostid %lu - range " |
0fd73091 CB |
4418 | "%lu", |
4419 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4420 | map->nsid, map->hostid, map->range); | |
f8aa4bf3 | 4421 | } |
4355ab5f SH |
4422 | } |
4423 | ||
f8aa4bf3 | 4424 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 4425 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 | 4426 | if (ret < 0) { |
0fd73091 | 4427 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); |
f8aa4bf3 | 4428 | goto on_error; |
4355ab5f SH |
4429 | } |
4430 | ||
f8aa4bf3 | 4431 | /* Tell child to proceed. */ |
489f39be | 4432 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
dcf0ffdf | 4433 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
f8aa4bf3 | 4434 | goto on_error; |
4355ab5f SH |
4435 | } |
4436 | ||
686dd5d1 | 4437 | on_error: |
4355ab5f SH |
4438 | if (p[0] != -1) |
4439 | close(p[0]); | |
4440 | close(p[1]); | |
f8aa4bf3 | 4441 | |
ee1b16bc TA |
4442 | /* Wait for child to finish. */ |
4443 | if (pid > 0) | |
4444 | status = wait_for_pid(pid); | |
4445 | ||
686dd5d1 CB |
4446 | if (status < 0) |
4447 | ret = -1; | |
4448 | ||
f8aa4bf3 | 4449 | return ret; |
4355ab5f | 4450 | } |
97e9cfa0 | 4451 | |
415a8851 CB |
4452 | int userns_exec_full(struct lxc_conf *conf, int (*fn)(void *), void *data, |
4453 | const char *fn_name) | |
4454 | { | |
4455 | pid_t pid; | |
4456 | uid_t euid, egid; | |
415a8851 CB |
4457 | int p[2]; |
4458 | struct id_map *map; | |
4459 | struct lxc_list *cur; | |
0fd73091 | 4460 | struct userns_fn_data d; |
415a8851 | 4461 | int ret = -1; |
0fd73091 | 4462 | char c = '1'; |
415a8851 CB |
4463 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
4464 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, | |
4465 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4466 | ||
2b2655a8 CB |
4467 | if (!conf) |
4468 | return -EINVAL; | |
4469 | ||
979f9e34 | 4470 | ret = pipe2(p, O_CLOEXEC); |
415a8851 CB |
4471 | if (ret < 0) { |
4472 | SYSERROR("opening pipe"); | |
4473 | return -1; | |
4474 | } | |
4475 | d.fn = fn; | |
4476 | d.fn_name = fn_name; | |
4477 | d.arg = data; | |
4478 | d.p[0] = p[0]; | |
4479 | d.p[1] = p[1]; | |
4480 | ||
4481 | /* Clone child in new user namespace. */ | |
4482 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER); | |
4483 | if (pid < 0) { | |
0fd73091 | 4484 | ERROR("Failed to clone process in new user namespace"); |
415a8851 CB |
4485 | goto on_error; |
4486 | } | |
4487 | ||
4488 | close(p[0]); | |
4489 | p[0] = -1; | |
4490 | ||
4491 | euid = geteuid(); | |
4492 | egid = getegid(); | |
4493 | ||
4494 | /* Allocate new {g,u}id map list. */ | |
4495 | idmap = malloc(sizeof(*idmap)); | |
4496 | if (!idmap) | |
4497 | goto on_error; | |
4498 | lxc_list_init(idmap); | |
4499 | ||
4500 | /* Find container root. */ | |
0fd73091 | 4501 | lxc_list_for_each (cur, &conf->id_map) { |
415a8851 CB |
4502 | struct id_map *tmpmap; |
4503 | ||
4504 | tmplist = malloc(sizeof(*tmplist)); | |
4505 | if (!tmplist) | |
4506 | goto on_error; | |
4507 | ||
4508 | tmpmap = malloc(sizeof(*tmpmap)); | |
4509 | if (!tmpmap) { | |
4510 | free(tmplist); | |
4511 | goto on_error; | |
4512 | } | |
4513 | ||
4514 | memset(tmpmap, 0, sizeof(*tmpmap)); | |
4515 | memcpy(tmpmap, cur->elem, sizeof(*tmpmap)); | |
4516 | tmplist->elem = tmpmap; | |
4517 | ||
4518 | lxc_list_add_tail(idmap, tmplist); | |
4519 | ||
4520 | map = cur->elem; | |
4521 | ||
4522 | if (map->idtype == ID_TYPE_UID) | |
4523 | if (euid >= map->hostid && euid < map->hostid + map->range) | |
4524 | host_uid_map = map; | |
4525 | ||
4526 | if (map->idtype == ID_TYPE_GID) | |
4527 | if (egid >= map->hostid && egid < map->hostid + map->range) | |
4528 | host_gid_map = map; | |
4529 | ||
4530 | if (map->nsid != 0) | |
4531 | continue; | |
4532 | ||
4533 | if (map->idtype == ID_TYPE_UID) | |
4534 | if (container_root_uid == NULL) | |
4535 | container_root_uid = map; | |
4536 | ||
4537 | if (map->idtype == ID_TYPE_GID) | |
4538 | if (container_root_gid == NULL) | |
4539 | container_root_gid = map; | |
4540 | } | |
4541 | ||
4542 | if (!container_root_uid || !container_root_gid) { | |
4543 | ERROR("No mapping for container root found"); | |
4544 | goto on_error; | |
4545 | } | |
4546 | ||
4547 | /* Check whether the {g,u}id of the user has a mapping. */ | |
4548 | if (!host_uid_map) | |
c4333195 | 4549 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
415a8851 CB |
4550 | else |
4551 | host_uid_map = container_root_uid; | |
4552 | ||
4553 | if (!host_gid_map) | |
c4333195 | 4554 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); |
415a8851 CB |
4555 | else |
4556 | host_gid_map = container_root_gid; | |
4557 | ||
4558 | if (!host_uid_map) { | |
4559 | DEBUG("Failed to find mapping for uid %d", euid); | |
4560 | goto on_error; | |
4561 | } | |
4562 | ||
4563 | if (!host_gid_map) { | |
4564 | DEBUG("Failed to find mapping for gid %d", egid); | |
4565 | goto on_error; | |
4566 | } | |
4567 | ||
4568 | if (host_uid_map && (host_uid_map != container_root_uid)) { | |
4569 | /* Add container root to the map. */ | |
4570 | tmplist = malloc(sizeof(*tmplist)); | |
4571 | if (!tmplist) | |
4572 | goto on_error; | |
4573 | lxc_list_add_elem(tmplist, host_uid_map); | |
4574 | lxc_list_add_tail(idmap, tmplist); | |
4575 | } | |
4576 | /* idmap will now keep track of that memory. */ | |
4577 | host_uid_map = NULL; | |
4578 | ||
4579 | if (host_gid_map && (host_gid_map != container_root_gid)) { | |
4580 | tmplist = malloc(sizeof(*tmplist)); | |
4581 | if (!tmplist) | |
4582 | goto on_error; | |
4583 | lxc_list_add_elem(tmplist, host_gid_map); | |
4584 | lxc_list_add_tail(idmap, tmplist); | |
4585 | } | |
4586 | /* idmap will now keep track of that memory. */ | |
4587 | host_gid_map = NULL; | |
4588 | ||
4589 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || | |
4590 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
0fd73091 | 4591 | lxc_list_for_each (cur, idmap) { |
415a8851 CB |
4592 | map = cur->elem; |
4593 | TRACE("establishing %cid mapping for \"%d\" in new " | |
4594 | "user namespace: nsuid %lu - hostid %lu - range " | |
4595 | "%lu", | |
4596 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4597 | map->nsid, map->hostid, map->range); | |
4598 | } | |
4599 | } | |
4600 | ||
4601 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
4602 | ret = lxc_map_ids(idmap, pid); | |
4603 | if (ret < 0) { | |
0fd73091 | 4604 | ERROR("error setting up {g,u}id mappings for child process \"%d\"", pid); |
415a8851 CB |
4605 | goto on_error; |
4606 | } | |
4607 | ||
4608 | /* Tell child to proceed. */ | |
489f39be | 4609 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
0fd73091 | 4610 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
415a8851 CB |
4611 | goto on_error; |
4612 | } | |
4613 | ||
686dd5d1 | 4614 | on_error: |
ee1b16bc TA |
4615 | if (p[0] != -1) |
4616 | close(p[0]); | |
4617 | close(p[1]); | |
4618 | ||
415a8851 | 4619 | /* Wait for child to finish. */ |
686dd5d1 CB |
4620 | if (pid > 0) |
4621 | ret = wait_for_pid(pid); | |
415a8851 | 4622 | |
80758b4b | 4623 | if (idmap) { |
415a8851 | 4624 | lxc_free_idmap(idmap); |
80758b4b DJ |
4625 | free(idmap); |
4626 | } | |
4627 | ||
415a8851 CB |
4628 | if (host_uid_map && (host_uid_map != container_root_uid)) |
4629 | free(host_uid_map); | |
4630 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4631 | free(host_gid_map); | |
4632 | ||
415a8851 CB |
4633 | return ret; |
4634 | } | |
4635 | ||
a96a8e8c | 4636 | /* not thread-safe, do not use from api without first forking */ |
0fd73091 | 4637 | static char *getuname(void) |
97e9cfa0 | 4638 | { |
cb7aa5e8 DJ |
4639 | struct passwd pwent; |
4640 | struct passwd *pwentp = NULL; | |
4641 | char *buf; | |
4642 | char *username; | |
4643 | size_t bufsize; | |
4644 | int ret; | |
97e9cfa0 | 4645 | |
cb7aa5e8 DJ |
4646 | bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); |
4647 | if (bufsize == -1) | |
4648 | bufsize = 1024; | |
4649 | ||
4650 | buf = malloc(bufsize); | |
4651 | if (!buf) | |
97e9cfa0 SH |
4652 | return NULL; |
4653 | ||
cb7aa5e8 DJ |
4654 | ret = getpwuid_r(geteuid(), &pwent, buf, bufsize, &pwentp); |
4655 | if (!pwentp) { | |
4656 | if (ret == 0) | |
4657 | WARN("Could not find matched password record."); | |
4658 | ||
4659 | ERROR("Failed to get password record - %u", geteuid()); | |
4660 | free(buf); | |
4661 | return NULL; | |
4662 | } | |
4663 | ||
4664 | username = strdup(pwent.pw_name); | |
4665 | free(buf); | |
4666 | ||
4667 | return username; | |
97e9cfa0 SH |
4668 | } |
4669 | ||
a96a8e8c | 4670 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4671 | static char *getgname(void) |
4672 | { | |
3de9fb4c DJ |
4673 | struct group grent; |
4674 | struct group *grentp = NULL; | |
4675 | char *buf; | |
4676 | char *grname; | |
4677 | size_t bufsize; | |
4678 | int ret; | |
4679 | ||
4680 | bufsize = sysconf(_SC_GETGR_R_SIZE_MAX); | |
4681 | if (bufsize == -1) | |
4682 | bufsize = 1024; | |
4683 | ||
4684 | buf = malloc(bufsize); | |
4685 | if (!buf) | |
4686 | return NULL; | |
4687 | ||
4688 | ret = getgrgid_r(getegid(), &grent, buf, bufsize, &grentp); | |
4689 | if (!grentp) { | |
4690 | if (ret == 0) | |
4691 | WARN("Could not find matched group record"); | |
97e9cfa0 | 4692 | |
3de9fb4c DJ |
4693 | ERROR("Failed to get group record - %u", getegid()); |
4694 | free(buf); | |
97e9cfa0 | 4695 | return NULL; |
3de9fb4c DJ |
4696 | } |
4697 | ||
4698 | grname = strdup(grent.gr_name); | |
4699 | free(buf); | |
97e9cfa0 | 4700 | |
3de9fb4c | 4701 | return grname; |
97e9cfa0 SH |
4702 | } |
4703 | ||
a96a8e8c | 4704 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4705 | void suggest_default_idmap(void) |
4706 | { | |
0fd73091 | 4707 | char *uname, *gname; |
97e9cfa0 SH |
4708 | FILE *f; |
4709 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; | |
97e9cfa0 | 4710 | size_t len = 0; |
0fd73091 | 4711 | char *line = NULL; |
97e9cfa0 | 4712 | |
0fd73091 CB |
4713 | uname = getuname(); |
4714 | if (!uname) | |
97e9cfa0 SH |
4715 | return; |
4716 | ||
0fd73091 CB |
4717 | gname = getgname(); |
4718 | if (!gname) { | |
97e9cfa0 SH |
4719 | free(uname); |
4720 | return; | |
4721 | } | |
4722 | ||
4723 | f = fopen(subuidfile, "r"); | |
4724 | if (!f) { | |
4725 | ERROR("Your system is not configured with subuids"); | |
4726 | free(gname); | |
4727 | free(uname); | |
4728 | return; | |
4729 | } | |
0fd73091 | 4730 | |
97e9cfa0 | 4731 | while (getline(&line, &len, f) != -1) { |
0fd73091 | 4732 | char *p, *p2; |
b7930180 | 4733 | size_t no_newline = 0; |
0fd73091 CB |
4734 | |
4735 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4736 | if (*line == '#') |
4737 | continue; | |
4738 | if (!p) | |
4739 | continue; | |
4740 | *p = '\0'; | |
4741 | p++; | |
0fd73091 | 4742 | |
97e9cfa0 SH |
4743 | if (strcmp(line, uname)) |
4744 | continue; | |
0fd73091 | 4745 | |
97e9cfa0 SH |
4746 | p2 = strchr(p, ':'); |
4747 | if (!p2) | |
4748 | continue; | |
4749 | *p2 = '\0'; | |
4750 | p2++; | |
4751 | if (!*p2) | |
4752 | continue; | |
b7930180 CB |
4753 | no_newline = strcspn(p2, "\n"); |
4754 | p2[no_newline] = '\0'; | |
4755 | ||
b7b2fde4 | 4756 | if (lxc_safe_uint(p, &uid) < 0) |
0fd73091 | 4757 | WARN("Could not parse UID"); |
b7b2fde4 | 4758 | if (lxc_safe_uint(p2, &urange) < 0) |
0fd73091 | 4759 | WARN("Could not parse UID range"); |
97e9cfa0 SH |
4760 | } |
4761 | fclose(f); | |
4762 | ||
6be7389a | 4763 | f = fopen(subgidfile, "r"); |
97e9cfa0 SH |
4764 | if (!f) { |
4765 | ERROR("Your system is not configured with subgids"); | |
4766 | free(gname); | |
4767 | free(uname); | |
4768 | return; | |
4769 | } | |
0fd73091 | 4770 | |
97e9cfa0 | 4771 | while (getline(&line, &len, f) != -1) { |
0fd73091 | 4772 | char *p, *p2; |
b7930180 | 4773 | size_t no_newline = 0; |
0fd73091 CB |
4774 | |
4775 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4776 | if (*line == '#') |
4777 | continue; | |
4778 | if (!p) | |
4779 | continue; | |
4780 | *p = '\0'; | |
4781 | p++; | |
0fd73091 | 4782 | |
97e9cfa0 SH |
4783 | if (strcmp(line, uname)) |
4784 | continue; | |
0fd73091 | 4785 | |
97e9cfa0 SH |
4786 | p2 = strchr(p, ':'); |
4787 | if (!p2) | |
4788 | continue; | |
4789 | *p2 = '\0'; | |
4790 | p2++; | |
4791 | if (!*p2) | |
4792 | continue; | |
b7930180 CB |
4793 | no_newline = strcspn(p2, "\n"); |
4794 | p2[no_newline] = '\0'; | |
4795 | ||
b7b2fde4 | 4796 | if (lxc_safe_uint(p, &gid) < 0) |
0fd73091 | 4797 | WARN("Could not parse GID"); |
b7b2fde4 | 4798 | if (lxc_safe_uint(p2, &grange) < 0) |
0fd73091 | 4799 | WARN("Could not parse GID range"); |
97e9cfa0 SH |
4800 | } |
4801 | fclose(f); | |
4802 | ||
f10fad2f | 4803 | free(line); |
97e9cfa0 SH |
4804 | |
4805 | if (!urange || !grange) { | |
4806 | ERROR("You do not have subuids or subgids allocated"); | |
4807 | ERROR("Unprivileged containers require subuids and subgids"); | |
fbd4a4d1 | 4808 | free(uname); |
1e7cd2f7 | 4809 | free(gname); |
97e9cfa0 SH |
4810 | return; |
4811 | } | |
4812 | ||
4813 | ERROR("You must either run as root, or define uid mappings"); | |
4814 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4815 | ERROR("~/.config/lxc/default.conf:"); | |
4816 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
bdcbb6b3 CB |
4817 | ERROR("lxc.idmap = u 0 %u %u", uid, urange); |
4818 | ERROR("lxc.idmap = g 0 %u %u", gid, grange); | |
97e9cfa0 SH |
4819 | |
4820 | free(gname); | |
4821 | free(uname); | |
4822 | } | |
aaf26830 | 4823 | |
a7307747 SH |
4824 | static void free_cgroup_settings(struct lxc_list *result) |
4825 | { | |
4826 | struct lxc_list *iterator, *next; | |
4827 | ||
0fd73091 | 4828 | lxc_list_for_each_safe (iterator, result, next) { |
a7307747 SH |
4829 | lxc_list_del(iterator); |
4830 | free(iterator); | |
4831 | } | |
4832 | free(result); | |
4833 | } | |
4834 | ||
0fd73091 | 4835 | /* Return the list of cgroup_settings sorted according to the following rules |
aaf26830 KT |
4836 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes |
4837 | */ | |
0fd73091 | 4838 | struct lxc_list *sort_cgroup_settings(struct lxc_list *cgroup_settings) |
aaf26830 KT |
4839 | { |
4840 | struct lxc_list *result; | |
aaf26830 | 4841 | struct lxc_cgroup *cg = NULL; |
0fd73091 | 4842 | struct lxc_list *it = NULL, *item = NULL, *memsw_limit = NULL; |
aaf26830 KT |
4843 | |
4844 | result = malloc(sizeof(*result)); | |
0fd73091 | 4845 | if (!result) |
fac7c663 | 4846 | return NULL; |
aaf26830 KT |
4847 | lxc_list_init(result); |
4848 | ||
0fd73091 CB |
4849 | /* Iterate over the cgroup settings and copy them to the output list. */ |
4850 | lxc_list_for_each (it, cgroup_settings) { | |
aaf26830 | 4851 | item = malloc(sizeof(*item)); |
fac7c663 | 4852 | if (!item) { |
a7307747 | 4853 | free_cgroup_settings(result); |
fac7c663 KT |
4854 | return NULL; |
4855 | } | |
0fd73091 | 4856 | |
aaf26830 KT |
4857 | item->elem = it->elem; |
4858 | cg = it->elem; | |
4859 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
4860 | /* Store the memsw_limit location */ | |
4861 | memsw_limit = item; | |
0fd73091 CB |
4862 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && |
4863 | memsw_limit != NULL) { | |
4864 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found | |
4865 | * before lxc.cgroup.memory.limit_in_bytes, swap these | |
4866 | * two items */ | |
aaf26830 KT |
4867 | item->elem = memsw_limit->elem; |
4868 | memsw_limit->elem = it->elem; | |
4869 | } | |
4870 | lxc_list_add_tail(result, item); | |
4871 | } | |
4872 | ||
4873 | return result; | |
a7307747 | 4874 | } |