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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 | 23 | |
d38dd64a CB |
24 | #ifndef _GNU_SOURCE |
25 | #define _GNU_SOURCE 1 | |
26 | #endif | |
9d257a2a | 27 | #include <arpa/inet.h> |
8f3e280e CB |
28 | #include <dirent.h> |
29 | #include <errno.h> | |
30 | #include <fcntl.h> | |
31 | #include <grp.h> | |
32 | #include <inttypes.h> | |
33 | #include <libgen.h> | |
9d257a2a CB |
34 | #include <linux/loop.h> |
35 | #include <net/if.h> | |
36 | #include <netinet/in.h> | |
8f3e280e CB |
37 | #include <pwd.h> |
38 | #include <stdarg.h> | |
0ad19a3f | 39 | #include <stdio.h> |
0ad19a3f | 40 | #include <stdlib.h> |
0ad19a3f | 41 | #include <string.h> |
8f3e280e CB |
42 | #include <sys/mman.h> |
43 | #include <sys/mount.h> | |
44 | #include <sys/param.h> | |
45 | #include <sys/prctl.h> | |
6a49f05e | 46 | #include <sys/sendfile.h> |
8f3e280e | 47 | #include <sys/socket.h> |
9d257a2a | 48 | #include <sys/stat.h> |
2d76d1d7 | 49 | #include <sys/syscall.h> |
9d257a2a | 50 | #include <sys/sysmacros.h> |
97e9cfa0 | 51 | #include <sys/types.h> |
8f3e280e CB |
52 | #include <sys/utsname.h> |
53 | #include <sys/wait.h> | |
9d257a2a CB |
54 | #include <time.h> |
55 | #include <unistd.h> | |
1d52bdf7 | 56 | |
d38dd64a CB |
57 | #include "af_unix.h" |
58 | #include "caps.h" | |
59 | #include "cgroup.h" | |
60 | #include "conf.h" | |
61 | #include "config.h" | |
62 | #include "confile.h" | |
63 | #include "confile_utils.h" | |
64 | #include "error.h" | |
65 | #include "log.h" | |
66 | #include "lsm/lsm.h" | |
67 | #include "lxclock.h" | |
68 | #include "lxcseccomp.h" | |
69 | #include "macro.h" | |
70 | #include "namespace.h" | |
71 | #include "network.h" | |
72 | #include "parse.h" | |
13be2733 | 73 | #include "raw_syscalls.h" |
d38dd64a CB |
74 | #include "ringbuf.h" |
75 | #include "start.h" | |
76 | #include "storage.h" | |
77 | #include "storage/overlay.h" | |
6b3d24d7 | 78 | #include "syscall_wrappers.h" |
d38dd64a CB |
79 | #include "terminal.h" |
80 | #include "utils.h" | |
81 | ||
af6824fc | 82 | #ifdef MAJOR_IN_MKDEV |
9d257a2a | 83 | #include <sys/mkdev.h> |
af6824fc | 84 | #endif |
af6824fc | 85 | |
614305f3 | 86 | #ifdef HAVE_STATVFS |
2938f7c8 | 87 | #include <sys/statvfs.h> |
614305f3 | 88 | #endif |
e827ff7e SG |
89 | |
90 | #if HAVE_PTY_H | |
b0a33c1e | 91 | #include <pty.h> |
e827ff7e SG |
92 | #else |
93 | #include <../include/openpty.h> | |
94 | #endif | |
0ad19a3f | 95 | |
9d257a2a CB |
96 | #if HAVE_LIBCAP |
97 | #include <sys/capability.h> | |
98 | #endif | |
99 | ||
100 | #if HAVE_SYS_PERSONALITY_H | |
101 | #include <sys/personality.h> | |
102 | #endif | |
103 | ||
f1e05b90 DJ |
104 | #ifndef HAVE_STRLCAT |
105 | #include "include/strlcat.h" | |
106 | #endif | |
107 | ||
9d257a2a CB |
108 | #if IS_BIONIC |
109 | #include <../include/lxcmntent.h> | |
110 | #else | |
111 | #include <mntent.h> | |
112 | #endif | |
113 | ||
114 | #if !defined(HAVE_PRLIMIT) && defined(HAVE_PRLIMIT64) | |
115 | #include <../include/prlimit.h> | |
116 | #endif | |
117 | ||
ac2cecc4 | 118 | lxc_log_define(conf, lxc); |
e5bda9ee | 119 | |
0fd73091 CB |
120 | /* The lxc_conf of the container currently being worked on in an API call. |
121 | * This is used in the error calls. | |
122 | */ | |
123 | #ifdef HAVE_TLS | |
d7f19646 | 124 | thread_local struct lxc_conf *current_config; |
0fd73091 CB |
125 | #else |
126 | struct lxc_conf *current_config; | |
127 | #endif | |
8912711c | 128 | |
0fd73091 CB |
129 | char *lxchook_names[NUM_LXC_HOOKS] = { |
130 | "pre-start", | |
131 | "pre-mount", | |
132 | "mount", | |
133 | "autodev", | |
134 | "start", | |
135 | "stop", | |
136 | "post-stop", | |
137 | "clone", | |
138 | "destroy", | |
139 | "start-host" | |
140 | }; | |
72d0e1cb | 141 | |
998ac676 RT |
142 | struct mount_opt { |
143 | char *name; | |
144 | int clear; | |
145 | int flag; | |
146 | }; | |
147 | ||
81810dd1 DL |
148 | struct caps_opt { |
149 | char *name; | |
150 | int value; | |
151 | }; | |
152 | ||
c6d09e15 WB |
153 | struct limit_opt { |
154 | char *name; | |
155 | int value; | |
156 | }; | |
157 | ||
998ac676 | 158 | static struct mount_opt mount_opt[] = { |
470b359b CB |
159 | { "async", 1, MS_SYNCHRONOUS }, |
160 | { "atime", 1, MS_NOATIME }, | |
161 | { "bind", 0, MS_BIND }, | |
88d413d5 | 162 | { "defaults", 0, 0 }, |
88d413d5 | 163 | { "dev", 1, MS_NODEV }, |
470b359b | 164 | { "diratime", 1, MS_NODIRATIME }, |
88d413d5 | 165 | { "dirsync", 0, MS_DIRSYNC }, |
470b359b | 166 | { "exec", 1, MS_NOEXEC }, |
8912711c | 167 | { "lazytime", 0, MS_LAZYTIME }, |
88d413d5 | 168 | { "mand", 0, MS_MANDLOCK }, |
88d413d5 | 169 | { "noatime", 0, MS_NOATIME }, |
470b359b | 170 | { "nodev", 0, MS_NODEV }, |
88d413d5 | 171 | { "nodiratime", 0, MS_NODIRATIME }, |
470b359b CB |
172 | { "noexec", 0, MS_NOEXEC }, |
173 | { "nomand", 1, MS_MANDLOCK }, | |
174 | { "norelatime", 1, MS_RELATIME }, | |
175 | { "nostrictatime", 1, MS_STRICTATIME }, | |
176 | { "nosuid", 0, MS_NOSUID }, | |
88d413d5 SW |
177 | { "rbind", 0, MS_BIND|MS_REC }, |
178 | { "relatime", 0, MS_RELATIME }, | |
470b359b CB |
179 | { "remount", 0, MS_REMOUNT }, |
180 | { "ro", 0, MS_RDONLY }, | |
181 | { "rw", 1, MS_RDONLY }, | |
88d413d5 | 182 | { "strictatime", 0, MS_STRICTATIME }, |
470b359b CB |
183 | { "suid", 1, MS_NOSUID }, |
184 | { "sync", 0, MS_SYNCHRONOUS }, | |
88d413d5 | 185 | { NULL, 0, 0 }, |
998ac676 RT |
186 | }; |
187 | ||
d840039e | 188 | static struct mount_opt propagation_opt[] = { |
0fd73091 CB |
189 | { "private", 0, MS_PRIVATE }, |
190 | { "shared", 0, MS_SHARED }, | |
191 | { "slave", 0, MS_SLAVE }, | |
192 | { "unbindable", 0, MS_UNBINDABLE }, | |
193 | { "rprivate", 0, MS_PRIVATE|MS_REC }, | |
194 | { "rshared", 0, MS_SHARED|MS_REC }, | |
195 | { "rslave", 0, MS_SLAVE|MS_REC }, | |
196 | { "runbindable", 0, MS_UNBINDABLE|MS_REC }, | |
197 | { NULL, 0, 0 }, | |
d840039e YT |
198 | }; |
199 | ||
81810dd1 | 200 | static struct caps_opt caps_opt[] = { |
8560cd36 | 201 | #if HAVE_LIBCAP |
0fd73091 CB |
202 | { "chown", CAP_CHOWN }, |
203 | { "dac_override", CAP_DAC_OVERRIDE }, | |
204 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
205 | { "fowner", CAP_FOWNER }, | |
206 | { "fsetid", CAP_FSETID }, | |
207 | { "kill", CAP_KILL }, | |
208 | { "setgid", CAP_SETGID }, | |
209 | { "setuid", CAP_SETUID }, | |
210 | { "setpcap", CAP_SETPCAP }, | |
211 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
212 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
213 | { "net_broadcast", CAP_NET_BROADCAST }, | |
214 | { "net_admin", CAP_NET_ADMIN }, | |
215 | { "net_raw", CAP_NET_RAW }, | |
216 | { "ipc_lock", CAP_IPC_LOCK }, | |
217 | { "ipc_owner", CAP_IPC_OWNER }, | |
218 | { "sys_module", CAP_SYS_MODULE }, | |
219 | { "sys_rawio", CAP_SYS_RAWIO }, | |
220 | { "sys_chroot", CAP_SYS_CHROOT }, | |
221 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
222 | { "sys_pacct", CAP_SYS_PACCT }, | |
223 | { "sys_admin", CAP_SYS_ADMIN }, | |
224 | { "sys_boot", CAP_SYS_BOOT }, | |
225 | { "sys_nice", CAP_SYS_NICE }, | |
226 | { "sys_resource", CAP_SYS_RESOURCE }, | |
227 | { "sys_time", CAP_SYS_TIME }, | |
228 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
229 | { "mknod", CAP_MKNOD }, | |
230 | { "lease", CAP_LEASE }, | |
57b837e2 | 231 | #ifdef CAP_AUDIT_READ |
0fd73091 | 232 | { "audit_read", CAP_AUDIT_READ }, |
57b837e2 | 233 | #endif |
9527e566 | 234 | #ifdef CAP_AUDIT_WRITE |
0fd73091 | 235 | { "audit_write", CAP_AUDIT_WRITE }, |
9527e566 FW |
236 | #endif |
237 | #ifdef CAP_AUDIT_CONTROL | |
0fd73091 | 238 | { "audit_control", CAP_AUDIT_CONTROL }, |
9527e566 | 239 | #endif |
0fd73091 CB |
240 | { "setfcap", CAP_SETFCAP }, |
241 | { "mac_override", CAP_MAC_OVERRIDE }, | |
242 | { "mac_admin", CAP_MAC_ADMIN }, | |
5170c716 | 243 | #ifdef CAP_SYSLOG |
0fd73091 | 244 | { "syslog", CAP_SYSLOG }, |
5170c716 CS |
245 | #endif |
246 | #ifdef CAP_WAKE_ALARM | |
0fd73091 | 247 | { "wake_alarm", CAP_WAKE_ALARM }, |
5170c716 | 248 | #endif |
2b54359b | 249 | #ifdef CAP_BLOCK_SUSPEND |
0fd73091 | 250 | { "block_suspend", CAP_BLOCK_SUSPEND }, |
2b54359b | 251 | #endif |
495d2046 | 252 | #endif |
8560cd36 | 253 | }; |
81810dd1 | 254 | |
c6d09e15 WB |
255 | static struct limit_opt limit_opt[] = { |
256 | #ifdef RLIMIT_AS | |
257 | { "as", RLIMIT_AS }, | |
258 | #endif | |
259 | #ifdef RLIMIT_CORE | |
260 | { "core", RLIMIT_CORE }, | |
261 | #endif | |
262 | #ifdef RLIMIT_CPU | |
263 | { "cpu", RLIMIT_CPU }, | |
264 | #endif | |
265 | #ifdef RLIMIT_DATA | |
266 | { "data", RLIMIT_DATA }, | |
267 | #endif | |
268 | #ifdef RLIMIT_FSIZE | |
269 | { "fsize", RLIMIT_FSIZE }, | |
270 | #endif | |
271 | #ifdef RLIMIT_LOCKS | |
272 | { "locks", RLIMIT_LOCKS }, | |
273 | #endif | |
274 | #ifdef RLIMIT_MEMLOCK | |
275 | { "memlock", RLIMIT_MEMLOCK }, | |
276 | #endif | |
277 | #ifdef RLIMIT_MSGQUEUE | |
278 | { "msgqueue", RLIMIT_MSGQUEUE }, | |
279 | #endif | |
280 | #ifdef RLIMIT_NICE | |
281 | { "nice", RLIMIT_NICE }, | |
282 | #endif | |
283 | #ifdef RLIMIT_NOFILE | |
284 | { "nofile", RLIMIT_NOFILE }, | |
285 | #endif | |
286 | #ifdef RLIMIT_NPROC | |
287 | { "nproc", RLIMIT_NPROC }, | |
288 | #endif | |
289 | #ifdef RLIMIT_RSS | |
290 | { "rss", RLIMIT_RSS }, | |
291 | #endif | |
292 | #ifdef RLIMIT_RTPRIO | |
293 | { "rtprio", RLIMIT_RTPRIO }, | |
294 | #endif | |
295 | #ifdef RLIMIT_RTTIME | |
296 | { "rttime", RLIMIT_RTTIME }, | |
297 | #endif | |
298 | #ifdef RLIMIT_SIGPENDING | |
299 | { "sigpending", RLIMIT_SIGPENDING }, | |
300 | #endif | |
301 | #ifdef RLIMIT_STACK | |
302 | { "stack", RLIMIT_STACK }, | |
303 | #endif | |
304 | }; | |
305 | ||
91c3830e SH |
306 | static int run_buffer(char *buffer) |
307 | { | |
8e7da691 | 308 | int ret; |
0fd73091 CB |
309 | char *output; |
310 | struct lxc_popen_FILE *f; | |
91c3830e | 311 | |
ebec9176 | 312 | f = lxc_popen(buffer); |
91c3830e | 313 | if (!f) { |
3f60c2f7 | 314 | SYSERROR("Failed to popen() %s", buffer); |
91c3830e SH |
315 | return -1; |
316 | } | |
317 | ||
318 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
319 | if (!output) { | |
3f60c2f7 | 320 | ERROR("Failed to allocate memory for %s", buffer); |
ebec9176 | 321 | lxc_pclose(f); |
91c3830e SH |
322 | return -1; |
323 | } | |
324 | ||
062b72c6 | 325 | while (fgets(output, LXC_LOG_BUFFER_SIZE, f->f)) |
3f60c2f7 | 326 | DEBUG("Script %s with output: %s", buffer, output); |
91c3830e SH |
327 | |
328 | free(output); | |
329 | ||
ebec9176 | 330 | ret = lxc_pclose(f); |
8e7da691 | 331 | if (ret == -1) { |
3f60c2f7 | 332 | SYSERROR("Script exited with error"); |
91c3830e | 333 | return -1; |
8e7da691 | 334 | } else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) { |
3f60c2f7 | 335 | ERROR("Script exited with status %d", WEXITSTATUS(ret)); |
8e7da691 DE |
336 | return -1; |
337 | } else if (WIFSIGNALED(ret)) { | |
3f60c2f7 | 338 | ERROR("Script terminated by signal %d", WTERMSIG(ret)); |
8e7da691 | 339 | return -1; |
91c3830e SH |
340 | } |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
14a7b0f9 CB |
345 | int run_script_argv(const char *name, unsigned int hook_version, |
346 | const char *section, const char *script, | |
586b1ce7 | 347 | const char *hookname, char **argv) |
148e91f5 | 348 | { |
3f60c2f7 | 349 | int buf_pos, i, ret; |
148e91f5 | 350 | char *buffer; |
6f8d00d2 | 351 | int fret = -1; |
d08e5708 | 352 | size_t size = 0; |
148e91f5 | 353 | |
3f60c2f7 CB |
354 | if (hook_version == 0) |
355 | INFO("Executing script \"%s\" for container \"%s\", config " | |
356 | "section \"%s\"", script, name, section); | |
357 | else | |
358 | INFO("Executing script \"%s\" for container \"%s\"", script, name); | |
148e91f5 | 359 | |
586b1ce7 CB |
360 | for (i = 0; argv && argv[i]; i++) |
361 | size += strlen(argv[i]) + 1; | |
148e91f5 | 362 | |
6333c915 CB |
363 | size += STRLITERALLEN("exec"); |
364 | size++; | |
148e91f5 | 365 | size += strlen(script); |
3f60c2f7 CB |
366 | size++; |
367 | ||
148e91f5 | 368 | if (size > INT_MAX) |
3f60c2f7 | 369 | return -EFBIG; |
148e91f5 | 370 | |
3f60c2f7 | 371 | if (hook_version == 0) { |
d08e5708 CB |
372 | size += strlen(hookname); |
373 | size++; | |
374 | ||
375 | size += strlen(name); | |
376 | size++; | |
377 | ||
378 | size += strlen(section); | |
379 | size++; | |
380 | ||
381 | if (size > INT_MAX) | |
382 | return -EFBIG; | |
327cce76 | 383 | } |
3f60c2f7 | 384 | |
6f8d00d2 CB |
385 | buffer = malloc(size); |
386 | if (!buffer) | |
387 | return -ENOMEM; | |
388 | ||
327cce76 | 389 | if (hook_version == 0) |
3f60c2f7 | 390 | buf_pos = snprintf(buffer, size, "exec %s %s %s %s", script, name, section, hookname); |
327cce76 | 391 | else |
3f60c2f7 | 392 | buf_pos = snprintf(buffer, size, "exec %s", script); |
327cce76 CB |
393 | if (buf_pos < 0 || (size_t)buf_pos >= size) { |
394 | ERROR("Failed to create command line for script \"%s\"", script); | |
6f8d00d2 | 395 | goto on_error; |
327cce76 | 396 | } |
3f60c2f7 | 397 | |
327cce76 | 398 | if (hook_version == 1) { |
3f60c2f7 CB |
399 | ret = setenv("LXC_HOOK_TYPE", hookname, 1); |
400 | if (ret < 0) { | |
401 | SYSERROR("Failed to set environment variable: " | |
402 | "LXC_HOOK_TYPE=%s", hookname); | |
6f8d00d2 | 403 | goto on_error; |
3f60c2f7 | 404 | } |
90f20466 | 405 | TRACE("Set environment variable: LXC_HOOK_TYPE=%s", hookname); |
3f60c2f7 CB |
406 | |
407 | ret = setenv("LXC_HOOK_SECTION", section, 1); | |
408 | if (ret < 0) { | |
409 | SYSERROR("Failed to set environment variable: " | |
410 | "LXC_HOOK_SECTION=%s", section); | |
6f8d00d2 | 411 | goto on_error; |
3f60c2f7 CB |
412 | } |
413 | TRACE("Set environment variable: LXC_HOOK_SECTION=%s", section); | |
14a7b0f9 CB |
414 | |
415 | if (strcmp(section, "net") == 0) { | |
416 | char *parent; | |
417 | ||
586b1ce7 | 418 | if (!argv || !argv[0]) |
6f8d00d2 | 419 | goto on_error; |
14a7b0f9 | 420 | |
586b1ce7 | 421 | ret = setenv("LXC_NET_TYPE", argv[0], 1); |
14a7b0f9 CB |
422 | if (ret < 0) { |
423 | SYSERROR("Failed to set environment variable: " | |
586b1ce7 | 424 | "LXC_NET_TYPE=%s", argv[0]); |
6f8d00d2 | 425 | goto on_error; |
14a7b0f9 | 426 | } |
586b1ce7 | 427 | TRACE("Set environment variable: LXC_NET_TYPE=%s", argv[0]); |
14a7b0f9 | 428 | |
586b1ce7 | 429 | parent = argv[1] ? argv[1] : ""; |
14a7b0f9 | 430 | |
a8144263 | 431 | if (strcmp(argv[0], "macvlan") == 0) { |
14a7b0f9 CB |
432 | ret = setenv("LXC_NET_PARENT", parent, 1); |
433 | if (ret < 0) { | |
434 | SYSERROR("Failed to set environment " | |
435 | "variable: LXC_NET_PARENT=%s", parent); | |
6f8d00d2 | 436 | goto on_error; |
14a7b0f9 CB |
437 | } |
438 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
a8144263 | 439 | } else if (strcmp(argv[0], "phys") == 0) { |
14a7b0f9 CB |
440 | ret = setenv("LXC_NET_PARENT", parent, 1); |
441 | if (ret < 0) { | |
442 | SYSERROR("Failed to set environment " | |
443 | "variable: LXC_NET_PARENT=%s", parent); | |
6f8d00d2 | 444 | goto on_error; |
14a7b0f9 CB |
445 | } |
446 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
a8144263 | 447 | } else if (strcmp(argv[0], "veth") == 0) { |
586b1ce7 | 448 | char *peer = argv[2] ? argv[2] : ""; |
14a7b0f9 CB |
449 | |
450 | ret = setenv("LXC_NET_PEER", peer, 1); | |
451 | if (ret < 0) { | |
452 | SYSERROR("Failed to set environment " | |
453 | "variable: LXC_NET_PEER=%s", peer); | |
6f8d00d2 | 454 | goto on_error; |
14a7b0f9 CB |
455 | } |
456 | TRACE("Set environment variable: LXC_NET_PEER=%s", peer); | |
457 | ||
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); | |
465 | } | |
466 | } | |
148e91f5 SH |
467 | } |
468 | ||
586b1ce7 | 469 | for (i = 0; argv && argv[i]; i++) { |
3f60c2f7 CB |
470 | size_t len = size - buf_pos; |
471 | ||
586b1ce7 | 472 | ret = snprintf(buffer + buf_pos, len, " %s", argv[i]); |
3f60c2f7 CB |
473 | if (ret < 0 || (size_t)ret >= len) { |
474 | ERROR("Failed to create command line for script \"%s\"", script); | |
6f8d00d2 | 475 | goto on_error; |
148e91f5 | 476 | } |
3f60c2f7 | 477 | buf_pos += ret; |
148e91f5 SH |
478 | } |
479 | ||
6f8d00d2 CB |
480 | fret = run_buffer(buffer); |
481 | ||
482 | on_error: | |
483 | free(buffer); | |
484 | return fret; | |
148e91f5 SH |
485 | } |
486 | ||
811ef482 | 487 | int run_script(const char *name, const char *section, const char *script, ...) |
e3b4c4c4 | 488 | { |
abbfd20b | 489 | int ret; |
91c3830e | 490 | char *buffer, *p; |
abbfd20b | 491 | va_list ap; |
0fd73091 | 492 | size_t size = 0; |
751d9dcd | 493 | |
0fd73091 | 494 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\"", |
751d9dcd | 495 | script, name, section); |
e3b4c4c4 | 496 | |
abbfd20b DL |
497 | va_start(ap, script); |
498 | while ((p = va_arg(ap, char *))) | |
95642a10 | 499 | size += strlen(p) + 1; |
abbfd20b DL |
500 | va_end(ap); |
501 | ||
6333c915 | 502 | size += STRLITERALLEN("exec"); |
abbfd20b DL |
503 | size += strlen(script); |
504 | size += strlen(name); | |
505 | size += strlen(section); | |
6d1a5f93 | 506 | size += 4; |
abbfd20b | 507 | |
95642a10 MS |
508 | if (size > INT_MAX) |
509 | return -1; | |
510 | ||
511 | buffer = alloca(size); | |
6d1a5f93 | 512 | ret = snprintf(buffer, size, "exec %s %s %s", script, name, section); |
0fd73091 | 513 | if (ret < 0 || ret >= size) |
9ba8130c | 514 | return -1; |
751d9dcd | 515 | |
abbfd20b | 516 | va_start(ap, script); |
9ba8130c | 517 | while ((p = va_arg(ap, char *))) { |
062b72c6 | 518 | int len = size - ret; |
9ba8130c SH |
519 | int rc; |
520 | rc = snprintf(buffer + ret, len, " %s", p); | |
7b5a2435 DJ |
521 | if (rc < 0 || rc >= len) { |
522 | va_end(ap); | |
9ba8130c | 523 | return -1; |
7b5a2435 | 524 | } |
9ba8130c SH |
525 | ret += rc; |
526 | } | |
abbfd20b | 527 | va_end(ap); |
751d9dcd | 528 | |
91c3830e | 529 | return run_buffer(buffer); |
e3b4c4c4 ST |
530 | } |
531 | ||
0fd73091 | 532 | /* pin_rootfs |
63fc76c3 | 533 | * if rootfs is a directory, then open ${rootfs}/.lxc-keep for writing for |
b7ed4bf0 CS |
534 | * the duration of the container run, to prevent the container from marking |
535 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
63fc76c3 GJ |
536 | * no name pollution is happens. |
537 | * don't unlink on NFS to avoid random named stale handles. | |
0c547523 SH |
538 | * return -1 on error. |
539 | * return -2 if nothing needed to be pinned. | |
540 | * return an open fd (>=0) if we pinned it. | |
541 | */ | |
542 | int pin_rootfs(const char *rootfs) | |
543 | { | |
0fd73091 | 544 | int fd, ret; |
6b5a54cd | 545 | char absrootfspin[PATH_MAX]; |
74e7b662 | 546 | char *absrootfs; |
0c547523 | 547 | struct stat s; |
63fc76c3 | 548 | struct statfs sfs; |
0c547523 | 549 | |
e99ee0de | 550 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 551 | return -2; |
e99ee0de | 552 | |
74e7b662 | 553 | absrootfs = realpath(rootfs, NULL); |
554 | if (!absrootfs) | |
9be53773 | 555 | return -2; |
0c547523 | 556 | |
0fd73091 | 557 | ret = stat(absrootfs, &s); |
74e7b662 | 558 | if (ret < 0) { |
559 | free(absrootfs); | |
0c547523 | 560 | return -1; |
74e7b662 | 561 | } |
0c547523 | 562 | |
74e7b662 | 563 | if (!S_ISDIR(s.st_mode)) { |
564 | free(absrootfs); | |
0c547523 | 565 | return -2; |
74e7b662 | 566 | } |
0c547523 | 567 | |
6b5a54cd | 568 | ret = snprintf(absrootfspin, PATH_MAX, "%s/.lxc-keep", absrootfs); |
74e7b662 | 569 | free(absrootfs); |
6b5a54cd | 570 | if (ret < 0 || ret >= PATH_MAX) |
0c547523 | 571 | return -1; |
0c547523 | 572 | |
0fd73091 | 573 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR | S_IRUSR); |
b7ed4bf0 CS |
574 | if (fd < 0) |
575 | return fd; | |
0fd73091 | 576 | |
205fc010 CB |
577 | ret = fstatfs (fd, &sfs); |
578 | if (ret < 0) | |
579 | return fd; | |
63fc76c3 GJ |
580 | |
581 | if (sfs.f_type == NFS_SUPER_MAGIC) { | |
205fc010 | 582 | DEBUG("Rootfs on NFS, not unlinking pin file \"%s\"", absrootfspin); |
63fc76c3 GJ |
583 | return fd; |
584 | } | |
585 | ||
b7ed4bf0 | 586 | (void)unlink(absrootfspin); |
0fd73091 | 587 | |
0c547523 SH |
588 | return fd; |
589 | } | |
590 | ||
0fd73091 CB |
591 | /* If we are asking to remount something, make sure that any NOEXEC etc are |
592 | * honored. | |
e2a7e8dc | 593 | */ |
5ae72b98 | 594 | unsigned long add_required_remount_flags(const char *s, const char *d, |
5285689c | 595 | unsigned long flags) |
e2a7e8dc | 596 | { |
614305f3 | 597 | #ifdef HAVE_STATVFS |
0fd73091 | 598 | int ret; |
e2a7e8dc SH |
599 | struct statvfs sb; |
600 | unsigned long required_flags = 0; | |
601 | ||
e2a7e8dc SH |
602 | if (!s) |
603 | s = d; | |
604 | ||
605 | if (!s) | |
606 | return flags; | |
0fd73091 CB |
607 | |
608 | ret = statvfs(s, &sb); | |
609 | if (ret < 0) | |
e2a7e8dc SH |
610 | return flags; |
611 | ||
69eadddb CB |
612 | if (flags & MS_REMOUNT) { |
613 | if (sb.f_flag & MS_NOSUID) | |
614 | required_flags |= MS_NOSUID; | |
615 | if (sb.f_flag & MS_NODEV) | |
616 | required_flags |= MS_NODEV; | |
617 | if (sb.f_flag & MS_RDONLY) | |
618 | required_flags |= MS_RDONLY; | |
619 | if (sb.f_flag & MS_NOEXEC) | |
620 | required_flags |= MS_NOEXEC; | |
621 | } | |
622 | ||
623 | if (sb.f_flag & MS_NOATIME) | |
624 | required_flags |= MS_NOATIME; | |
625 | if (sb.f_flag & MS_NODIRATIME) | |
626 | required_flags |= MS_NODIRATIME; | |
627 | if (sb.f_flag & MS_LAZYTIME) | |
628 | required_flags |= MS_LAZYTIME; | |
629 | if (sb.f_flag & MS_RELATIME) | |
630 | required_flags |= MS_RELATIME; | |
631 | if (sb.f_flag & MS_STRICTATIME) | |
632 | required_flags |= MS_STRICTATIME; | |
e2a7e8dc SH |
633 | |
634 | return flags | required_flags; | |
614305f3 SH |
635 | #else |
636 | return flags; | |
637 | #endif | |
e2a7e8dc SH |
638 | } |
639 | ||
6b741397 CB |
640 | static int add_shmount_to_list(struct lxc_conf *conf) |
641 | { | |
6b5a54cd | 642 | char new_mount[PATH_MAX]; |
0d190408 | 643 | /* Offset for the leading '/' since the path_cont |
6b741397 CB |
644 | * is absolute inside the container. |
645 | */ | |
646 | int offset = 1, ret = -1; | |
0d190408 | 647 | |
6b741397 CB |
648 | ret = snprintf(new_mount, sizeof(new_mount), |
649 | "%s %s none bind,create=dir 0 0", conf->shmount.path_host, | |
650 | conf->shmount.path_cont + offset); | |
60534030 | 651 | if (ret < 0 || (size_t)ret >= sizeof(new_mount)) |
0d190408 LT |
652 | return -1; |
653 | ||
6b741397 | 654 | return add_elem_to_mount_list(new_mount, conf); |
0d190408 LT |
655 | } |
656 | ||
4fb3cba5 | 657 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 658 | { |
0fd73091 | 659 | int i, r; |
b06b8511 CS |
660 | static struct { |
661 | int match_mask; | |
662 | int match_flag; | |
663 | const char *source; | |
664 | const char *destination; | |
665 | const char *fstype; | |
666 | unsigned long flags; | |
667 | const char *options; | |
668 | } default_mounts[] = { | |
0fd73091 CB |
669 | /* Read-only bind-mounting... In older kernels, doing that |
670 | * required to do one MS_BIND mount and then | |
671 | * MS_REMOUNT|MS_RDONLY the same one. According to mount(2) | |
672 | * manpage, MS_BIND honors MS_RDONLY from kernel 2.6.26 | |
673 | * onwards. However, this apparently does not work on kernel | |
674 | * 3.8. Unfortunately, on that very same kernel, doing the same | |
675 | * trick as above doesn't seem to work either, there one needs | |
676 | * to ALSO specify MS_BIND for the remount, otherwise the | |
677 | * entire fs is remounted read-only or the mount fails because | |
678 | * it's busy... MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for | |
679 | * kernels as low as 2.6.32... | |
368bbc02 | 680 | */ |
0fd73091 | 681 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
592fd47a | 682 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
0fd73091 CB |
683 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL }, |
684 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, | |
685 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
686 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL }, | |
687 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, | |
688 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
689 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
690 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
691 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
692 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
0fd73091 CB |
693 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, |
694 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
695 | { 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 }, | |
696 | { 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 }, | |
697 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 698 | }; |
368bbc02 | 699 | |
b06b8511 | 700 | for (i = 0; default_mounts[i].match_mask; i++) { |
0fd73091 CB |
701 | int saved_errno; |
702 | unsigned long mflags; | |
703 | char *destination = NULL; | |
704 | char *source = NULL; | |
705 | if ((flags & default_mounts[i].match_mask) != default_mounts[i].match_flag) | |
706 | continue; | |
707 | ||
708 | if (default_mounts[i].source) { | |
cc4fd506 | 709 | /* will act like strdup if %r is not present */ |
0fd73091 CB |
710 | source = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].source); |
711 | if (!source) | |
cc4fd506 | 712 | return -1; |
0fd73091 | 713 | } |
f24a52d5 | 714 | |
0fd73091 CB |
715 | if (!default_mounts[i].destination) { |
716 | ERROR("BUG: auto mounts destination %d was NULL", i); | |
b06b8511 | 717 | free(source); |
0fd73091 CB |
718 | return -1; |
719 | } | |
720 | ||
721 | /* will act like strdup if %r is not present */ | |
722 | destination = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].destination); | |
723 | if (!destination) { | |
724 | saved_errno = errno; | |
725 | free(source); | |
726 | errno = saved_errno; | |
727 | return -1; | |
728 | } | |
729 | ||
730 | mflags = add_required_remount_flags(source, destination, | |
731 | default_mounts[i].flags); | |
732 | r = safe_mount(source, destination, default_mounts[i].fstype, | |
733 | mflags, default_mounts[i].options, | |
734 | conf->rootfs.path ? conf->rootfs.mount : NULL); | |
735 | saved_errno = errno; | |
736 | if (r < 0 && errno == ENOENT) { | |
737 | INFO("Mount source or target for \"%s\" on \"%s\" does " | |
738 | "not exist. Skipping", source, destination); | |
739 | r = 0; | |
740 | } else if (r < 0) { | |
741 | SYSERROR("Failed to mount \"%s\" on \"%s\" with flags %lu", source, destination, mflags); | |
742 | } | |
743 | ||
744 | free(source); | |
745 | free(destination); | |
746 | if (r < 0) { | |
747 | errno = saved_errno; | |
748 | return -1; | |
368bbc02 | 749 | } |
368bbc02 CS |
750 | } |
751 | ||
b06b8511 | 752 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
753 | int cg_flags; |
754 | ||
3f69fb12 | 755 | cg_flags = flags & (LXC_AUTO_CGROUP_MASK & ~LXC_AUTO_CGROUP_FORCE); |
0fd73091 CB |
756 | /* If the type of cgroup mount was not specified, it depends on |
757 | * the container's capabilities as to what makes sense: if we | |
758 | * have CAP_SYS_ADMIN, the read-only part can be remounted | |
759 | * read-write anyway, so we may as well default to read-write; | |
760 | * then the admin will not be given a false sense of security. | |
761 | * (And if they really want mixed r/o r/w, then they can | |
762 | * explicitly specify :mixed.) OTOH, if the container lacks | |
763 | * CAP_SYS_ADMIN, do only default to :mixed, because then the | |
764 | * container can't remount it read-write. | |
765 | */ | |
0769b82a CS |
766 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { |
767 | int has_sys_admin = 0; | |
b0ee5983 CB |
768 | |
769 | if (!lxc_list_empty(&conf->keepcaps)) | |
0769b82a | 770 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); |
b0ee5983 | 771 | else |
0769b82a | 772 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); |
b0ee5983 CB |
773 | |
774 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) | |
0769b82a | 775 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; |
b0ee5983 | 776 | else |
0769b82a | 777 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; |
0769b82a | 778 | } |
0fd73091 | 779 | |
3f69fb12 | 780 | if (flags & LXC_AUTO_CGROUP_FORCE) |
0fd73091 CB |
781 | cg_flags |= LXC_AUTO_CGROUP_FORCE; |
782 | ||
2202afc9 CB |
783 | if (!handler->cgroup_ops->mount(handler->cgroup_ops, |
784 | handler, | |
785 | conf->rootfs.path ? conf->rootfs.mount : "", | |
786 | cg_flags)) { | |
0fd73091 | 787 | SYSERROR("Failed to mount \"/sys/fs/cgroup\""); |
b06b8511 | 788 | return -1; |
368bbc02 CS |
789 | } |
790 | } | |
791 | ||
0d190408 LT |
792 | if (flags & LXC_AUTO_SHMOUNTS_MASK) { |
793 | int ret = add_shmount_to_list(conf); | |
794 | if (ret < 0) { | |
795 | ERROR("Failed to add shmount entry to container config"); | |
6b741397 | 796 | return -1; |
0d190408 LT |
797 | } |
798 | } | |
799 | ||
368bbc02 | 800 | return 0; |
368bbc02 CS |
801 | } |
802 | ||
4e5440c6 | 803 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 804 | { |
0fd73091 CB |
805 | int ret; |
806 | ||
4e5440c6 DL |
807 | if (!utsname) |
808 | return 0; | |
0ad19a3f | 809 | |
0fd73091 CB |
810 | ret = sethostname(utsname->nodename, strlen(utsname->nodename)); |
811 | if (ret < 0) { | |
812 | SYSERROR("Failed to set the hostname to \"%s\"", utsname->nodename); | |
0ad19a3f | 813 | return -1; |
814 | } | |
815 | ||
0fd73091 | 816 | INFO("Set hostname to \"%s\"", utsname->nodename); |
cd54d859 | 817 | |
0ad19a3f | 818 | return 0; |
819 | } | |
820 | ||
69aa6655 DE |
821 | struct dev_symlinks { |
822 | const char *oldpath; | |
823 | const char *name; | |
824 | }; | |
825 | ||
826 | static const struct dev_symlinks dev_symlinks[] = { | |
0fd73091 CB |
827 | { "/proc/self/fd", "fd" }, |
828 | { "/proc/self/fd/0", "stdin" }, | |
829 | { "/proc/self/fd/1", "stdout" }, | |
830 | { "/proc/self/fd/2", "stderr" }, | |
69aa6655 DE |
831 | }; |
832 | ||
ed8704d0 | 833 | static int lxc_setup_dev_symlinks(const struct lxc_rootfs *rootfs) |
69aa6655 | 834 | { |
0fd73091 | 835 | int i, ret; |
6b5a54cd | 836 | char path[PATH_MAX]; |
09227be2 | 837 | struct stat s; |
69aa6655 | 838 | |
69aa6655 DE |
839 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { |
840 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
0fd73091 CB |
841 | |
842 | ret = snprintf(path, sizeof(path), "%s/dev/%s", | |
843 | rootfs->path ? rootfs->mount : "", d->name); | |
6b5a54cd | 844 | if (ret < 0 || ret >= PATH_MAX) |
69aa6655 | 845 | return -1; |
09227be2 | 846 | |
0fd73091 CB |
847 | /* Stat the path first. If we don't get an error accept it as |
848 | * is and don't try to create it | |
09227be2 | 849 | */ |
0fd73091 CB |
850 | ret = stat(path, &s); |
851 | if (ret == 0) | |
09227be2 | 852 | continue; |
09227be2 | 853 | |
69aa6655 DE |
854 | ret = symlink(d->oldpath, path); |
855 | if (ret && errno != EEXIST) { | |
0fd73091 CB |
856 | if (errno == EROFS) { |
857 | WARN("Failed to create \"%s\". Read-only filesystem", path); | |
09227be2 | 858 | } else { |
0fd73091 | 859 | SYSERROR("Failed to create \"%s\"", path); |
09227be2 MW |
860 | return -1; |
861 | } | |
69aa6655 DE |
862 | } |
863 | } | |
0fd73091 | 864 | |
69aa6655 DE |
865 | return 0; |
866 | } | |
867 | ||
2187efd3 | 868 | /* Build a space-separate list of ptys to pass to systemd. */ |
885766f5 | 869 | static bool append_ttyname(char **pp, char *name) |
b0a33c1e | 870 | { |
393903d1 | 871 | char *p; |
f1e05b90 | 872 | size_t size; |
393903d1 SH |
873 | |
874 | if (!*pp) { | |
875 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
876 | if (!*pp) | |
877 | return false; | |
0fd73091 | 878 | |
393903d1 SH |
879 | sprintf(*pp, "container_ttys=%s", name); |
880 | return true; | |
881 | } | |
0fd73091 | 882 | |
f1e05b90 DJ |
883 | size = strlen(*pp) + strlen(name) + 2; |
884 | p = realloc(*pp, size); | |
393903d1 SH |
885 | if (!p) |
886 | return false; | |
0fd73091 | 887 | |
393903d1 | 888 | *pp = p; |
f1e05b90 DJ |
889 | (void)strlcat(p, " ", size); |
890 | (void)strlcat(p, name, size); | |
0fd73091 | 891 | |
393903d1 SH |
892 | return true; |
893 | } | |
894 | ||
2187efd3 | 895 | static int lxc_setup_ttys(struct lxc_conf *conf) |
393903d1 | 896 | { |
9e1045e3 | 897 | int i, ret; |
0e4be3cf | 898 | const struct lxc_tty_info *ttys = &conf->ttys; |
885766f5 | 899 | char *ttydir = ttys->dir; |
6b5a54cd | 900 | char path[PATH_MAX], lxcpath[PATH_MAX]; |
b0a33c1e | 901 | |
e8bd4e43 | 902 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
903 | return 0; |
904 | ||
885766f5 | 905 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 906 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
b0a33c1e | 907 | |
e8bd4e43 | 908 | ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1); |
73363c61 | 909 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 910 | return -1; |
9e1045e3 | 911 | |
7c6ef2a2 SH |
912 | if (ttydir) { |
913 | /* create dev/lxc/tty%d" */ | |
9e1045e3 CB |
914 | ret = snprintf(lxcpath, sizeof(lxcpath), |
915 | "/dev/%s/tty%d", ttydir, i + 1); | |
73363c61 | 916 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
7c6ef2a2 | 917 | return -1; |
9e1045e3 | 918 | |
adc1c715 | 919 | ret = mknod(lxcpath, S_IFREG | 0000, 0); |
9e1045e3 | 920 | if (ret < 0 && errno != EEXIST) { |
73363c61 | 921 | SYSERROR("Failed to create \"%s\"", lxcpath); |
7c6ef2a2 SH |
922 | return -1; |
923 | } | |
9e1045e3 | 924 | |
7c6ef2a2 | 925 | ret = unlink(path); |
9e1045e3 | 926 | if (ret < 0 && errno != ENOENT) { |
73363c61 | 927 | SYSERROR("Failed to unlink \"%s\"", path); |
7c6ef2a2 SH |
928 | return -1; |
929 | } | |
b0a33c1e | 930 | |
2520facd | 931 | ret = mount(tty->name, lxcpath, "none", MS_BIND, 0); |
9e1045e3 | 932 | if (ret < 0) { |
adc1c715 WB |
933 | SYSWARN("Failed to bind mount \"%s\" onto \"%s\"", |
934 | tty->name, lxcpath); | |
7c6ef2a2 SH |
935 | continue; |
936 | } | |
0fd73091 | 937 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, |
adc1c715 | 938 | lxcpath); |
13954cce | 939 | |
9e1045e3 CB |
940 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", |
941 | ttydir, i + 1); | |
73363c61 | 942 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
9ba8130c | 943 | return -1; |
9e1045e3 | 944 | |
7c6ef2a2 | 945 | ret = symlink(lxcpath, path); |
9e1045e3 | 946 | if (ret < 0) { |
73363c61 | 947 | SYSERROR("Failed to create symlink \"%s\" -> \"%s\"", |
9e1045e3 | 948 | path, lxcpath); |
7c6ef2a2 SH |
949 | return -1; |
950 | } | |
951 | } else { | |
9e1045e3 CB |
952 | /* If we populated /dev, then we need to create |
953 | * /dev/ttyN | |
954 | */ | |
d3ccc04e CB |
955 | ret = mknod(path, S_IFREG | 0000, 0); |
956 | if (ret < 0) /* this isn't fatal, continue */ | |
6d1400b5 | 957 | SYSERROR("Failed to create \"%s\"", path); |
9e1045e3 | 958 | |
2520facd | 959 | ret = mount(tty->name, path, "none", MS_BIND, 0); |
9e1045e3 | 960 | if (ret < 0) { |
2520facd | 961 | SYSERROR("Failed to mount '%s'->'%s'", tty->name, path); |
7c6ef2a2 SH |
962 | continue; |
963 | } | |
9e1045e3 | 964 | |
d3ccc04e | 965 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, path); |
393903d1 | 966 | } |
9e1045e3 | 967 | |
885766f5 | 968 | if (!append_ttyname(&conf->ttys.tty_names, tty->name)) { |
393903d1 SH |
969 | ERROR("Error setting up container_ttys string"); |
970 | return -1; | |
b0a33c1e | 971 | } |
972 | } | |
973 | ||
885766f5 | 974 | INFO("Finished setting up %zu /dev/tty<N> device(s)", ttys->max); |
b0a33c1e | 975 | return 0; |
976 | } | |
977 | ||
663014ee | 978 | int lxc_allocate_ttys(struct lxc_conf *conf) |
2187efd3 | 979 | { |
fca23691 | 980 | size_t i; |
981 | int ret; | |
0fd73091 | 982 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 CB |
983 | |
984 | /* no tty in the configuration */ | |
885766f5 | 985 | if (ttys->max == 0) |
2187efd3 CB |
986 | return 0; |
987 | ||
885766f5 | 988 | ttys->tty = malloc(sizeof(*ttys->tty) * ttys->max); |
0e4be3cf | 989 | if (!ttys->tty) |
2187efd3 | 990 | return -ENOMEM; |
2187efd3 | 991 | |
885766f5 | 992 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 993 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 994 | |
386e6768 CB |
995 | tty->master = -EBADF; |
996 | tty->slave = -EBADF; | |
77a39805 CB |
997 | ret = openpty(&tty->master, &tty->slave, NULL, NULL, NULL); |
998 | if (ret < 0) { | |
fca23691 | 999 | SYSERROR("Failed to create tty %zu", i); |
885766f5 | 1000 | ttys->max = i; |
0e4be3cf | 1001 | lxc_delete_tty(ttys); |
2187efd3 CB |
1002 | return -ENOTTY; |
1003 | } | |
1004 | ||
77a39805 CB |
1005 | ret = ttyname_r(tty->slave, tty->name, sizeof(tty->name)); |
1006 | if (ret < 0) { | |
fca23691 | 1007 | SYSERROR("Failed to retrieve name of tty %zu slave", i); |
77a39805 CB |
1008 | ttys->max = i; |
1009 | lxc_delete_tty(ttys); | |
1010 | return -ENOTTY; | |
1011 | } | |
1012 | ||
0fd73091 | 1013 | DEBUG("Created tty \"%s\" with master fd %d and slave fd %d", |
2520facd | 1014 | tty->name, tty->master, tty->slave); |
2187efd3 CB |
1015 | |
1016 | /* Prevent leaking the file descriptors to the container */ | |
615f24ff | 1017 | ret = fd_cloexec(tty->master, true); |
2187efd3 | 1018 | if (ret < 0) |
a24c5678 | 1019 | SYSWARN("Failed to set FD_CLOEXEC flag on master fd %d of " |
1020 | "tty device \"%s\"", tty->master, tty->name); | |
2187efd3 | 1021 | |
615f24ff | 1022 | ret = fd_cloexec(tty->slave, true); |
2187efd3 | 1023 | if (ret < 0) |
a24c5678 | 1024 | SYSWARN("Failed to set FD_CLOEXEC flag on slave fd %d of " |
1025 | "tty device \"%s\"", tty->slave, tty->name); | |
2187efd3 | 1026 | |
2520facd | 1027 | tty->busy = 0; |
2187efd3 CB |
1028 | } |
1029 | ||
885766f5 | 1030 | INFO("Finished creating %zu tty devices", ttys->max); |
2187efd3 CB |
1031 | return 0; |
1032 | } | |
1033 | ||
0e4be3cf | 1034 | void lxc_delete_tty(struct lxc_tty_info *ttys) |
2187efd3 CB |
1035 | { |
1036 | int i; | |
1037 | ||
386e6768 CB |
1038 | if (!ttys->tty) |
1039 | return; | |
1040 | ||
885766f5 | 1041 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 1042 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1043 | |
386e6768 CB |
1044 | if (tty->master >= 0) { |
1045 | close(tty->master); | |
1046 | tty->master = -EBADF; | |
1047 | } | |
1048 | ||
1049 | if (tty->slave >= 0) { | |
1050 | close(tty->slave); | |
1051 | tty->slave = -EBADF; | |
1052 | } | |
2187efd3 CB |
1053 | } |
1054 | ||
0e4be3cf CB |
1055 | free(ttys->tty); |
1056 | ttys->tty = NULL; | |
2187efd3 CB |
1057 | } |
1058 | ||
1059 | static int lxc_send_ttys_to_parent(struct lxc_handler *handler) | |
1060 | { | |
1061 | int i; | |
0fd73091 | 1062 | int ret = -1; |
2187efd3 | 1063 | struct lxc_conf *conf = handler->conf; |
0e4be3cf | 1064 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 | 1065 | int sock = handler->data_sock[0]; |
2187efd3 | 1066 | |
885766f5 | 1067 | if (ttys->max == 0) |
2187efd3 CB |
1068 | return 0; |
1069 | ||
885766f5 | 1070 | for (i = 0; i < ttys->max; i++) { |
2187efd3 | 1071 | int ttyfds[2]; |
0e4be3cf | 1072 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1073 | |
2520facd CB |
1074 | ttyfds[0] = tty->master; |
1075 | ttyfds[1] = tty->slave; | |
2187efd3 CB |
1076 | |
1077 | ret = lxc_abstract_unix_send_fds(sock, ttyfds, 2, NULL, 0); | |
1078 | if (ret < 0) | |
1079 | break; | |
1080 | ||
7d7333b3 | 1081 | TRACE("Sent tty \"%s\" with master fd %d and slave fd %d to " |
2520facd | 1082 | "parent", tty->name, tty->master, tty->slave); |
2187efd3 CB |
1083 | } |
1084 | ||
1085 | if (ret < 0) | |
6d1400b5 | 1086 | SYSERROR("Failed to send %zu ttys to parent", ttys->max); |
2187efd3 | 1087 | else |
885766f5 | 1088 | TRACE("Sent %zu ttys to parent", ttys->max); |
2187efd3 CB |
1089 | |
1090 | return ret; | |
1091 | } | |
1092 | ||
1093 | static int lxc_create_ttys(struct lxc_handler *handler) | |
1094 | { | |
1095 | int ret = -1; | |
1096 | struct lxc_conf *conf = handler->conf; | |
1097 | ||
663014ee | 1098 | ret = lxc_allocate_ttys(conf); |
2187efd3 CB |
1099 | if (ret < 0) { |
1100 | ERROR("Failed to allocate ttys"); | |
1101 | goto on_error; | |
1102 | } | |
1103 | ||
1104 | ret = lxc_send_ttys_to_parent(handler); | |
1105 | if (ret < 0) { | |
1106 | ERROR("Failed to send ttys to parent"); | |
1107 | goto on_error; | |
1108 | } | |
1109 | ||
1110 | if (!conf->is_execute) { | |
1111 | ret = lxc_setup_ttys(conf); | |
1112 | if (ret < 0) { | |
1113 | ERROR("Failed to setup ttys"); | |
1114 | goto on_error; | |
1115 | } | |
1116 | } | |
1117 | ||
885766f5 CB |
1118 | if (conf->ttys.tty_names) { |
1119 | ret = setenv("container_ttys", conf->ttys.tty_names, 1); | |
2187efd3 | 1120 | if (ret < 0) |
885766f5 | 1121 | SYSERROR("Failed to set \"container_ttys=%s\"", conf->ttys.tty_names); |
2187efd3 CB |
1122 | } |
1123 | ||
1124 | ret = 0; | |
1125 | ||
1126 | on_error: | |
0e4be3cf | 1127 | lxc_delete_tty(&conf->ttys); |
2187efd3 CB |
1128 | |
1129 | return ret; | |
1130 | } | |
1131 | ||
7133b912 CB |
1132 | /* Just create a path for /dev under $lxcpath/$name and in rootfs If we hit an |
1133 | * error, log it but don't fail yet. | |
91c3830e | 1134 | */ |
7133b912 CB |
1135 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, |
1136 | const char *lxcpath) | |
91c3830e SH |
1137 | { |
1138 | int ret; | |
87da4ec3 SH |
1139 | size_t clen; |
1140 | char *path; | |
87e0e273 | 1141 | mode_t cur_mask; |
91c3830e | 1142 | |
7133b912 | 1143 | INFO("Preparing \"/dev\""); |
bc6928ff | 1144 | |
14221cbb | 1145 | /* $(rootfs->mount) + "/dev/pts" + '\0' */ |
ec50007f | 1146 | clen = (rootfs->path ? strlen(rootfs->mount) : 0) + 9; |
87da4ec3 | 1147 | path = alloca(clen); |
bc6928ff | 1148 | |
ec50007f | 1149 | ret = snprintf(path, clen, "%s/dev", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1150 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1151 | return -1; |
bc6928ff | 1152 | |
87e0e273 CB |
1153 | cur_mask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
1154 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
1155 | if (ret < 0 && errno != EEXIST) { | |
1156 | SYSERROR("Failed to create \"/dev\" directory"); | |
1157 | ret = -errno; | |
1158 | goto reset_umask; | |
bc6928ff | 1159 | } |
87da4ec3 | 1160 | |
1ec0e8e3 | 1161 | ret = safe_mount("none", path, "tmpfs", 0, "size=500000,mode=755", |
7133b912 CB |
1162 | rootfs->path ? rootfs->mount : NULL); |
1163 | if (ret < 0) { | |
1164 | SYSERROR("Failed to mount tmpfs on \"%s\"", path); | |
87e0e273 | 1165 | goto reset_umask; |
91c3830e | 1166 | } |
87e0e273 | 1167 | TRACE("Mounted tmpfs on \"%s\"", path); |
87da4ec3 | 1168 | |
ec50007f | 1169 | ret = snprintf(path, clen, "%s/dev/pts", rootfs->path ? rootfs->mount : ""); |
87e0e273 CB |
1170 | if (ret < 0 || (size_t)ret >= clen) { |
1171 | ret = -1; | |
1172 | goto reset_umask; | |
1173 | } | |
87da4ec3 | 1174 | |
7133b912 | 1175 | /* If we are running on a devtmpfs mapping, dev/pts may already exist. |
bc6928ff MW |
1176 | * If not, then create it and exit if that fails... |
1177 | */ | |
87e0e273 CB |
1178 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
1179 | if (ret < 0 && errno != EEXIST) { | |
1180 | SYSERROR("Failed to create directory \"%s\"", path); | |
1181 | ret = -errno; | |
1182 | goto reset_umask; | |
91c3830e SH |
1183 | } |
1184 | ||
87e0e273 CB |
1185 | ret = 0; |
1186 | ||
1187 | reset_umask: | |
1188 | (void)umask(cur_mask); | |
1189 | ||
7133b912 | 1190 | INFO("Prepared \"/dev\""); |
87e0e273 | 1191 | return ret; |
91c3830e SH |
1192 | } |
1193 | ||
5e73416f | 1194 | struct lxc_device_node { |
74a3920a | 1195 | const char *name; |
5e73416f CB |
1196 | const mode_t mode; |
1197 | const int maj; | |
1198 | const int min; | |
c6883f38 SH |
1199 | }; |
1200 | ||
5e73416f | 1201 | static const struct lxc_device_node lxc_devices[] = { |
06749971 | 1202 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, |
5e73416f | 1203 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
06749971 CB |
1204 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, |
1205 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
5e73416f CB |
1206 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, |
1207 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
c6883f38 SH |
1208 | }; |
1209 | ||
5067e4dd CB |
1210 | |
1211 | enum { | |
1212 | LXC_DEVNODE_BIND, | |
1213 | LXC_DEVNODE_MKNOD, | |
1214 | LXC_DEVNODE_PARTIAL, | |
1215 | LXC_DEVNODE_OPEN, | |
1216 | }; | |
1217 | ||
27245ff7 | 1218 | static int lxc_fill_autodev(const struct lxc_rootfs *rootfs) |
c6883f38 | 1219 | { |
5e73416f | 1220 | int i, ret; |
6b5a54cd | 1221 | char path[PATH_MAX]; |
3a32201c | 1222 | mode_t cmask; |
5067e4dd | 1223 | int use_mknod = LXC_DEVNODE_MKNOD; |
c6883f38 | 1224 | |
6b5a54cd | 1225 | ret = snprintf(path, PATH_MAX, "%s/dev", |
3999be0a | 1226 | rootfs->path ? rootfs->mount : ""); |
6b5a54cd | 1227 | if (ret < 0 || ret >= PATH_MAX) |
c6883f38 | 1228 | return -1; |
91c3830e | 1229 | |
0bbf8572 CB |
1230 | /* ignore, just don't try to fill in */ |
1231 | if (!dir_exists(path)) | |
9cb4d183 SH |
1232 | return 0; |
1233 | ||
3999be0a CB |
1234 | INFO("Populating \"/dev\""); |
1235 | ||
3a32201c | 1236 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
5e73416f | 1237 | for (i = 0; i < sizeof(lxc_devices) / sizeof(lxc_devices[0]); i++) { |
6b5a54cd | 1238 | char hostpath[PATH_MAX]; |
5e73416f | 1239 | const struct lxc_device_node *device = &lxc_devices[i]; |
0728ebf4 | 1240 | |
6b5a54cd | 1241 | ret = snprintf(path, PATH_MAX, "%s/dev/%s", |
5e73416f | 1242 | rootfs->path ? rootfs->mount : "", device->name); |
6b5a54cd | 1243 | if (ret < 0 || ret >= PATH_MAX) |
c6883f38 | 1244 | return -1; |
0bbf8572 | 1245 | |
5067e4dd | 1246 | if (use_mknod >= LXC_DEVNODE_MKNOD) { |
5e73416f CB |
1247 | ret = mknod(path, device->mode, makedev(device->maj, device->min)); |
1248 | if (ret == 0 || (ret < 0 && errno == EEXIST)) { | |
1249 | DEBUG("Created device node \"%s\"", path); | |
5067e4dd CB |
1250 | } else if (ret < 0) { |
1251 | if (errno != EPERM) { | |
1252 | SYSERROR("Failed to create device node \"%s\"", path); | |
1253 | return -1; | |
1254 | } | |
0bbf8572 | 1255 | |
5067e4dd | 1256 | use_mknod = LXC_DEVNODE_BIND; |
9cb4d183 | 1257 | } |
3999be0a | 1258 | |
5067e4dd CB |
1259 | /* Device nodes are fully useable. */ |
1260 | if (use_mknod == LXC_DEVNODE_OPEN) | |
1261 | continue; | |
1262 | ||
1263 | if (use_mknod == LXC_DEVNODE_MKNOD) { | |
1264 | /* See | |
1265 | * - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=55956b59df336f6738da916dbb520b6e37df9fbd | |
1266 | * - https://lists.linuxfoundation.org/pipermail/containers/2018-June/039176.html | |
1267 | */ | |
1268 | ret = open(path, O_RDONLY | O_CLOEXEC); | |
1269 | if (ret >= 0) { | |
1270 | close(ret); | |
1271 | /* Device nodes are fully useable. */ | |
1272 | use_mknod = LXC_DEVNODE_OPEN; | |
1273 | continue; | |
1274 | } | |
1275 | ||
1276 | SYSTRACE("Failed to open \"%s\" device", path); | |
1277 | /* Device nodes are only partially useable. */ | |
1278 | use_mknod = LXC_DEVNODE_PARTIAL; | |
1279 | } | |
5e73416f CB |
1280 | } |
1281 | ||
5067e4dd CB |
1282 | if (use_mknod != LXC_DEVNODE_PARTIAL) { |
1283 | /* If we are dealing with partially functional device | |
1284 | * nodes the prio mknod() call will have created the | |
1285 | * device node so we can use it as a bind-mount target. | |
1286 | */ | |
1287 | ret = mknod(path, S_IFREG | 0000, 0); | |
1288 | if (ret < 0 && errno != EEXIST) { | |
1289 | SYSERROR("Failed to create file \"%s\"", path); | |
1290 | return -1; | |
1291 | } | |
5e73416f CB |
1292 | } |
1293 | ||
1294 | /* Fallback to bind-mounting the device from the host. */ | |
6b5a54cd CB |
1295 | ret = snprintf(hostpath, PATH_MAX, "/dev/%s", device->name); |
1296 | if (ret < 0 || ret >= PATH_MAX) | |
5e73416f CB |
1297 | return -1; |
1298 | ||
1299 | ret = safe_mount(hostpath, path, 0, MS_BIND, NULL, | |
1300 | rootfs->path ? rootfs->mount : NULL); | |
1301 | if (ret < 0) { | |
1302 | SYSERROR("Failed to bind mount host device node \"%s\" " | |
1303 | "onto \"%s\"", hostpath, path); | |
1304 | return -1; | |
c6883f38 | 1305 | } |
5e73416f CB |
1306 | DEBUG("Bind mounted host device node \"%s\" onto \"%s\"", |
1307 | hostpath, path); | |
c6883f38 | 1308 | } |
5e73416f | 1309 | (void)umask(cmask); |
c6883f38 | 1310 | |
3999be0a | 1311 | INFO("Populated \"/dev\""); |
c6883f38 SH |
1312 | return 0; |
1313 | } | |
1314 | ||
8ce1abc2 | 1315 | static int lxc_mount_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1316 | { |
9aa76a17 | 1317 | int ret; |
10bc1861 | 1318 | struct lxc_storage *bdev; |
8ce1abc2 | 1319 | const struct lxc_rootfs *rootfs = &conf->rootfs; |
cc28d0b0 | 1320 | |
a0f379bf | 1321 | if (!rootfs->path) { |
0fd73091 CB |
1322 | ret = mount("", "/", NULL, MS_SLAVE | MS_REC, 0); |
1323 | if (ret < 0) { | |
8ce1abc2 | 1324 | SYSERROR("Failed to remount \"/\" MS_REC | MS_SLAVE"); |
a0f379bf DW |
1325 | return -1; |
1326 | } | |
0fd73091 | 1327 | |
c69bd12f | 1328 | return 0; |
a0f379bf | 1329 | } |
0ad19a3f | 1330 | |
0fd73091 CB |
1331 | ret = access(rootfs->mount, F_OK); |
1332 | if (ret != 0) { | |
1333 | SYSERROR("Failed to access to \"%s\". Check it is present", | |
12297168 | 1334 | rootfs->mount); |
b1789442 DL |
1335 | return -1; |
1336 | } | |
1337 | ||
8a388ed4 | 1338 | bdev = storage_init(conf); |
9aa76a17 | 1339 | if (!bdev) { |
0fd73091 | 1340 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1341 | rootfs->path, rootfs->mount, |
1342 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1343 | return -1; |
9be53773 | 1344 | } |
9aa76a17 CB |
1345 | |
1346 | ret = bdev->ops->mount(bdev); | |
10bc1861 | 1347 | storage_put(bdev); |
9aa76a17 | 1348 | if (ret < 0) { |
0fd73091 | 1349 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1350 | rootfs->path, rootfs->mount, |
1351 | rootfs->options ? rootfs->options : "(null)"); | |
c3f0a28c | 1352 | return -1; |
1353 | } | |
0ad19a3f | 1354 | |
0fd73091 | 1355 | DEBUG("Mounted rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1356 | rootfs->path, rootfs->mount, |
1357 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1358 | |
ac778708 DL |
1359 | return 0; |
1360 | } | |
1361 | ||
8ce1abc2 | 1362 | int lxc_chroot(const struct lxc_rootfs *rootfs) |
91e93c71 | 1363 | { |
0fd73091 CB |
1364 | int i, ret; |
1365 | char *p, *p2; | |
74e7b662 | 1366 | char buf[LXC_LINELEN]; |
1367 | char *nroot; | |
91e93c71 | 1368 | FILE *f; |
8ce1abc2 | 1369 | char *root = rootfs->mount; |
91e93c71 | 1370 | |
74e7b662 | 1371 | nroot = realpath(root, NULL); |
1372 | if (!nroot) { | |
8ce1abc2 | 1373 | SYSERROR("Failed to resolve \"%s\"", root); |
0fd73091 | 1374 | return -1; |
8ce1abc2 | 1375 | } |
91e93c71 | 1376 | |
0fd73091 | 1377 | ret = chdir("/"); |
74e7b662 | 1378 | if (ret < 0) { |
1379 | free(nroot); | |
0fd73091 | 1380 | return -1; |
74e7b662 | 1381 | } |
91e93c71 | 1382 | |
0fd73091 CB |
1383 | /* We could use here MS_MOVE, but in userns this mount is locked and |
1384 | * can't be moved. | |
91e93c71 | 1385 | */ |
8ce1abc2 | 1386 | ret = mount(nroot, "/", NULL, MS_REC | MS_BIND, NULL); |
0fd73091 | 1387 | if (ret < 0) { |
8ce1abc2 | 1388 | SYSERROR("Failed to mount \"%s\" onto \"/\" as MS_REC | MS_BIND", nroot); |
74e7b662 | 1389 | free(nroot); |
0fd73091 | 1390 | return -1; |
91e93c71 | 1391 | } |
74e7b662 | 1392 | free(nroot); |
91e93c71 | 1393 | |
0fd73091 CB |
1394 | ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL); |
1395 | if (ret < 0) { | |
8ce1abc2 | 1396 | SYSERROR("Failed to remount \"/\""); |
0fd73091 | 1397 | return -1; |
91e93c71 AV |
1398 | } |
1399 | ||
aa899945 | 1400 | /* The following code cleans up inherited mounts which are not required |
0fd73091 | 1401 | * for CT. |
91e93c71 AV |
1402 | * |
1403 | * The mountinfo file shows not all mounts, if a few points have been | |
1404 | * unmounted between read operations from the mountinfo. So we need to | |
1405 | * read mountinfo a few times. | |
1406 | * | |
7ded5fa7 | 1407 | * This loop can be skipped if a container uses userns, because all |
91e93c71 AV |
1408 | * inherited mounts are locked and we should live with all this trash. |
1409 | */ | |
0fd73091 | 1410 | for (;;) { |
91e93c71 AV |
1411 | int progress = 0; |
1412 | ||
1413 | f = fopen("./proc/self/mountinfo", "r"); | |
1414 | if (!f) { | |
8ce1abc2 | 1415 | SYSERROR("Failed to open \"/proc/self/mountinfo\""); |
91e93c71 AV |
1416 | return -1; |
1417 | } | |
0fd73091 | 1418 | |
eab15c1e | 1419 | while (fgets(buf, LXC_LINELEN, f)) { |
91e93c71 AV |
1420 | for (p = buf, i=0; p && i < 4; i++) |
1421 | p = strchr(p+1, ' '); | |
0fd73091 | 1422 | |
91e93c71 AV |
1423 | if (!p) |
1424 | continue; | |
0fd73091 | 1425 | |
91e93c71 AV |
1426 | p2 = strchr(p+1, ' '); |
1427 | if (!p2) | |
1428 | continue; | |
1429 | ||
1430 | *p2 = '\0'; | |
1431 | *p = '.'; | |
1432 | ||
1433 | if (strcmp(p + 1, "/") == 0) | |
1434 | continue; | |
0fd73091 | 1435 | |
91e93c71 AV |
1436 | if (strcmp(p + 1, "/proc") == 0) |
1437 | continue; | |
1438 | ||
0fd73091 CB |
1439 | ret = umount2(p, MNT_DETACH); |
1440 | if (ret == 0) | |
91e93c71 AV |
1441 | progress++; |
1442 | } | |
0fd73091 | 1443 | |
91e93c71 | 1444 | fclose(f); |
0fd73091 | 1445 | |
91e93c71 AV |
1446 | if (!progress) |
1447 | break; | |
1448 | } | |
1449 | ||
7ded5fa7 | 1450 | /* This also can be skipped if a container uses userns. */ |
0fd73091 | 1451 | (void)umount2("./proc", MNT_DETACH); |
91e93c71 AV |
1452 | |
1453 | /* It is weird, but chdir("..") moves us in a new root */ | |
0fd73091 CB |
1454 | ret = chdir(".."); |
1455 | if (ret < 0) { | |
8ce1abc2 | 1456 | SYSERROR("Failed to chdir(\"..\")"); |
91e93c71 AV |
1457 | return -1; |
1458 | } | |
1459 | ||
0fd73091 CB |
1460 | ret = chroot("."); |
1461 | if (ret < 0) { | |
8ce1abc2 | 1462 | SYSERROR("Failed to chroot(\".\")"); |
91e93c71 AV |
1463 | return -1; |
1464 | } | |
1465 | ||
1466 | return 0; | |
1467 | } | |
1468 | ||
8ce1abc2 CB |
1469 | /* (The following explanation is copied verbatim from the kernel.) |
1470 | * | |
1471 | * pivot_root Semantics: | |
1472 | * Moves the root file system of the current process to the directory put_old, | |
1473 | * makes new_root as the new root file system of the current process, and sets | |
1474 | * root/cwd of all processes which had them on the current root to new_root. | |
1475 | * | |
1476 | * Restrictions: | |
1477 | * The new_root and put_old must be directories, and must not be on the | |
1478 | * same file system as the current process root. The put_old must be | |
1479 | * underneath new_root, i.e. adding a non-zero number of /.. to the string | |
1480 | * pointed to by put_old must yield the same directory as new_root. No other | |
1481 | * file system may be mounted on put_old. After all, new_root is a mountpoint. | |
1482 | * | |
1483 | * Also, the current root cannot be on the 'rootfs' (initial ramfs) filesystem. | |
1484 | * See Documentation/filesystems/ramfs-rootfs-initramfs.txt for alternatives | |
1485 | * in this situation. | |
1486 | * | |
1487 | * Notes: | |
1488 | * - we don't move root/cwd if they are not at the root (reason: if something | |
1489 | * cared enough to change them, it's probably wrong to force them elsewhere) | |
1490 | * - it's okay to pick a root that isn't the root of a file system, e.g. | |
1491 | * /nfs/my_root where /nfs is the mount point. It must be a mountpoint, | |
1492 | * though, so you may need to say mount --bind /nfs/my_root /nfs/my_root | |
1493 | * first. | |
1494 | */ | |
1495 | static int lxc_pivot_root(const char *rootfs) | |
ac778708 | 1496 | { |
e2d0c21b CB |
1497 | int oldroot; |
1498 | int newroot = -1, ret = -1; | |
0fd73091 | 1499 | |
7806ebd7 | 1500 | oldroot = open("/", O_DIRECTORY | O_RDONLY | O_CLOEXEC); |
8ce1abc2 CB |
1501 | if (oldroot < 0) { |
1502 | SYSERROR("Failed to open old root directory"); | |
1503 | return -1; | |
39c7b795 | 1504 | } |
ac778708 | 1505 | |
7806ebd7 | 1506 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY | O_CLOEXEC); |
8ce1abc2 CB |
1507 | if (newroot < 0) { |
1508 | SYSERROR("Failed to open new root directory"); | |
1509 | goto on_error; | |
1510 | } | |
0fd73091 | 1511 | |
8ce1abc2 CB |
1512 | /* change into new root fs */ |
1513 | ret = fchdir(newroot); | |
1514 | if (ret < 0) { | |
1515 | ret = -1; | |
1516 | SYSERROR("Failed to change to new rootfs \"%s\"", rootfs); | |
1517 | goto on_error; | |
1518 | } | |
39c7b795 | 1519 | |
8ce1abc2 CB |
1520 | /* pivot_root into our new root fs */ |
1521 | ret = pivot_root(".", "."); | |
1522 | if (ret < 0) { | |
1523 | ret = -1; | |
1524 | SYSERROR("Failed to pivot_root()"); | |
1525 | goto on_error; | |
39c7b795 CB |
1526 | } |
1527 | ||
8ce1abc2 CB |
1528 | /* At this point the old-root is mounted on top of our new-root. To |
1529 | * unmounted it we must not be chdir'd into it, so escape back to | |
1530 | * old-root. | |
1531 | */ | |
1532 | ret = fchdir(oldroot); | |
0fd73091 | 1533 | if (ret < 0) { |
8ce1abc2 CB |
1534 | ret = -1; |
1535 | SYSERROR("Failed to enter old root directory"); | |
1536 | goto on_error; | |
c69bd12f DL |
1537 | } |
1538 | ||
8ce1abc2 CB |
1539 | /* Make oldroot rslave to make sure our umounts don't propagate to the |
1540 | * host. | |
1541 | */ | |
1542 | ret = mount("", ".", "", MS_SLAVE | MS_REC, NULL); | |
1543 | if (ret < 0) { | |
1544 | ret = -1; | |
1545 | SYSERROR("Failed to make oldroot rslave"); | |
1546 | goto on_error; | |
1547 | } | |
1548 | ||
1549 | ret = umount2(".", MNT_DETACH); | |
1550 | if (ret < 0) { | |
1551 | ret = -1; | |
1552 | SYSERROR("Failed to detach old root directory"); | |
1553 | goto on_error; | |
1554 | } | |
1555 | ||
1556 | ret = fchdir(newroot); | |
1557 | if (ret < 0) { | |
1558 | ret = -1; | |
1559 | SYSERROR("Failed to re-enter new root directory"); | |
1560 | goto on_error; | |
1561 | } | |
1562 | ||
1563 | ret = 0; | |
1564 | ||
1565 | TRACE("pivot_root(\"%s\") successful", rootfs); | |
1566 | ||
1567 | on_error: | |
e2d0c21b CB |
1568 | close(oldroot); |
1569 | ||
1570 | if (newroot >= 0) | |
8ce1abc2 CB |
1571 | close(newroot); |
1572 | ||
1573 | return ret; | |
0ad19a3f | 1574 | } |
1575 | ||
8ce1abc2 CB |
1576 | static int lxc_setup_rootfs_switch_root(const struct lxc_rootfs *rootfs) |
1577 | { | |
1578 | if (!rootfs->path) { | |
1579 | DEBUG("Container does not have a rootfs"); | |
1580 | return 0; | |
1581 | } | |
1582 | ||
1583 | if (detect_ramfs_rootfs()) | |
1584 | return lxc_chroot(rootfs); | |
1585 | ||
1586 | return lxc_pivot_root(rootfs->mount); | |
0ad19a3f | 1587 | } |
1588 | ||
8ce1abc2 CB |
1589 | static const struct id_map *find_mapped_nsid_entry(struct lxc_conf *conf, |
1590 | unsigned id, | |
1591 | enum idtype idtype) | |
f4900711 CB |
1592 | { |
1593 | struct lxc_list *it; | |
1594 | struct id_map *map; | |
1595 | struct id_map *retmap = NULL; | |
1596 | ||
dcf0ffdf CB |
1597 | /* Shortcut for container's root mappings. */ |
1598 | if (id == 0) { | |
1599 | if (idtype == ID_TYPE_UID) | |
1600 | return conf->root_nsuid_map; | |
1601 | ||
1602 | if (idtype == ID_TYPE_GID) | |
1603 | return conf->root_nsgid_map; | |
1604 | } | |
1605 | ||
f4900711 CB |
1606 | lxc_list_for_each(it, &conf->id_map) { |
1607 | map = it->elem; | |
1608 | if (map->idtype != idtype) | |
1609 | continue; | |
1610 | ||
1611 | if (id >= map->nsid && id < map->nsid + map->range) { | |
1612 | retmap = map; | |
1613 | break; | |
1614 | } | |
1615 | } | |
1616 | ||
1617 | return retmap; | |
1618 | } | |
1619 | ||
1620 | static int lxc_setup_devpts(struct lxc_conf *conf) | |
3c26f34e | 1621 | { |
70761e5e | 1622 | int ret; |
ce155c60 | 1623 | char **opts; |
9d28c4f9 | 1624 | char devpts_mntopts[256]; |
ce155c60 CB |
1625 | char *mntopt_sets[5]; |
1626 | char default_devpts_mntopts[256] = "gid=5,newinstance,ptmxmode=0666,mode=0620"; | |
77890c6d | 1627 | |
e528c735 | 1628 | if (conf->pty_max <= 0) { |
0fd73091 | 1629 | DEBUG("No new devpts instance will be mounted since no pts " |
70761e5e | 1630 | "devices are requested"); |
d852c78c | 1631 | return 0; |
3c26f34e | 1632 | } |
1633 | ||
e528c735 CB |
1634 | ret = snprintf(devpts_mntopts, sizeof(devpts_mntopts), "%s,max=%zu", |
1635 | default_devpts_mntopts, conf->pty_max); | |
9d28c4f9 CB |
1636 | if (ret < 0 || (size_t)ret >= sizeof(devpts_mntopts)) |
1637 | return -1; | |
1638 | ||
77f94854 CB |
1639 | ret = umount2("/dev/pts", MNT_DETACH); |
1640 | if (ret < 0) | |
a24c5678 | 1641 | SYSWARN("Failed to unmount old devpts instance"); |
77f94854 | 1642 | else |
0fd73091 | 1643 | DEBUG("Unmounted old devpts instance"); |
7e40254a | 1644 | |
70761e5e CB |
1645 | /* Create mountpoint for devpts instance. */ |
1646 | ret = mkdir("/dev/pts", 0755); | |
1647 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1648 | SYSERROR("Failed to create \"/dev/pts\" directory"); |
3c26f34e | 1649 | return -1; |
1650 | } | |
1651 | ||
ce155c60 CB |
1652 | /* gid=5 && max= */ |
1653 | mntopt_sets[0] = devpts_mntopts; | |
dfbd4730 | 1654 | |
ce155c60 | 1655 | /* !gid=5 && max= */ |
6333c915 | 1656 | mntopt_sets[1] = devpts_mntopts + STRLITERALLEN("gid=5") + 1; |
ce155c60 CB |
1657 | |
1658 | /* gid=5 && !max= */ | |
1659 | mntopt_sets[2] = default_devpts_mntopts; | |
1660 | ||
1661 | /* !gid=5 && !max= */ | |
6333c915 | 1662 | mntopt_sets[3] = default_devpts_mntopts + STRLITERALLEN("gid=5") + 1; |
ce155c60 CB |
1663 | |
1664 | /* end */ | |
1665 | mntopt_sets[4] = NULL; | |
1666 | ||
1667 | for (ret = -1, opts = mntopt_sets; opts && *opts; opts++) { | |
1668 | /* mount new devpts instance */ | |
1669 | ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, *opts); | |
1670 | if (ret == 0) | |
1671 | break; | |
1672 | } | |
1673 | ||
1674 | if (ret < 0) { | |
1675 | SYSERROR("Failed to mount new devpts instance"); | |
1676 | return -1; | |
70761e5e | 1677 | } |
ce155c60 | 1678 | DEBUG("Mount new devpts instance with options \"%s\"", *opts); |
70761e5e | 1679 | |
d5cb35d6 | 1680 | /* Remove any pre-existing /dev/ptmx file. */ |
b29e05d6 CB |
1681 | ret = remove("/dev/ptmx"); |
1682 | if (ret < 0) { | |
1683 | if (errno != ENOENT) { | |
0fd73091 | 1684 | SYSERROR("Failed to remove existing \"/dev/ptmx\" file"); |
d5cb35d6 | 1685 | return -1; |
70761e5e | 1686 | } |
b29e05d6 | 1687 | } else { |
0fd73091 | 1688 | DEBUG("Removed existing \"/dev/ptmx\" file"); |
3c26f34e | 1689 | } |
1690 | ||
d5cb35d6 | 1691 | /* Create dummy /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
3b7e332f CB |
1692 | ret = mknod("/dev/ptmx", S_IFREG | 0000, 0); |
1693 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1694 | SYSERROR("Failed to create dummy \"/dev/ptmx\" file as bind mount target"); |
d5cb35d6 CB |
1695 | return -1; |
1696 | } | |
0fd73091 | 1697 | DEBUG("Created dummy \"/dev/ptmx\" file as bind mount target"); |
77890c6d | 1698 | |
d5cb35d6 | 1699 | /* Fallback option: create symlink /dev/ptmx -> /dev/pts/ptmx */ |
e87bd19c | 1700 | ret = mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL); |
d5cb35d6 | 1701 | if (!ret) { |
0fd73091 | 1702 | DEBUG("Bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1703 | return 0; |
1704 | } else { | |
1705 | /* Fallthrough and try to create a symlink. */ | |
0fd73091 | 1706 | ERROR("Failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1707 | } |
1708 | ||
1709 | /* Remove the dummy /dev/ptmx file we created above. */ | |
1710 | ret = remove("/dev/ptmx"); | |
70761e5e | 1711 | if (ret < 0) { |
0fd73091 | 1712 | SYSERROR("Failed to remove existing \"/dev/ptmx\""); |
d5cb35d6 CB |
1713 | return -1; |
1714 | } | |
1715 | ||
1716 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
1717 | ret = symlink("/dev/pts/ptmx", "/dev/ptmx"); | |
1718 | if (ret < 0) { | |
0fd73091 | 1719 | SYSERROR("Failed to create symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
3c26f34e | 1720 | return -1; |
1721 | } | |
0fd73091 | 1722 | DEBUG("Created symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
cd54d859 | 1723 | |
3c26f34e | 1724 | return 0; |
1725 | } | |
1726 | ||
cccc74b5 DL |
1727 | static int setup_personality(int persona) |
1728 | { | |
0fd73091 CB |
1729 | int ret; |
1730 | ||
1731 | #if HAVE_SYS_PERSONALITY_H | |
cccc74b5 DL |
1732 | if (persona == -1) |
1733 | return 0; | |
1734 | ||
0fd73091 CB |
1735 | ret = personality(persona); |
1736 | if (ret < 0) { | |
1737 | SYSERROR("Failed to set personality to \"0x%x\"", persona); | |
cccc74b5 DL |
1738 | return -1; |
1739 | } | |
1740 | ||
0fd73091 CB |
1741 | INFO("Set personality to \"0x%x\"", persona); |
1742 | #endif | |
cccc74b5 DL |
1743 | |
1744 | return 0; | |
1745 | } | |
1746 | ||
3d7d929a | 1747 | static int lxc_setup_dev_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1748 | const struct lxc_terminal *console) |
6e590161 | 1749 | { |
882671aa | 1750 | int ret; |
6b5a54cd | 1751 | char path[PATH_MAX]; |
86530b0a | 1752 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
52e35957 | 1753 | |
8b1b1210 CB |
1754 | if (console->path && !strcmp(console->path, "none")) |
1755 | return 0; | |
1756 | ||
86530b0a | 1757 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3d7d929a | 1758 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1759 | return -1; |
52e35957 | 1760 | |
8b1b1210 CB |
1761 | /* When we are asked to setup a console we remove any previous |
1762 | * /dev/console bind-mounts. | |
1763 | */ | |
a7ba3c7f CB |
1764 | if (file_exists(path)) { |
1765 | ret = lxc_unstack_mountpoint(path, false); | |
1766 | if (ret < 0) { | |
6d1400b5 | 1767 | SYSERROR("Failed to unmount \"%s\"", path); |
a7ba3c7f CB |
1768 | return -ret; |
1769 | } else { | |
86530b0a | 1770 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1771 | } |
8b1b1210 CB |
1772 | } |
1773 | ||
1774 | /* For unprivileged containers autodev or automounts will already have | |
1775 | * taken care of creating /dev/console. | |
1776 | */ | |
882671aa | 1777 | ret = mknod(path, S_IFREG | 0000, 0); |
3b7e332f CB |
1778 | if (ret < 0 && errno != EEXIST) { |
1779 | SYSERROR("Failed to create console"); | |
1780 | return -errno; | |
52e35957 DL |
1781 | } |
1782 | ||
e581b9b5 | 1783 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP); |
86530b0a | 1784 | if (ret < 0) { |
0fd73091 | 1785 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
e581b9b5 | 1786 | S_IXUSR | S_IXGRP, console->name); |
3d7d929a | 1787 | return -errno; |
63376d7d | 1788 | } |
13954cce | 1789 | |
86530b0a L |
1790 | ret = safe_mount(console->name, path, "none", MS_BIND, 0, rootfs_path); |
1791 | if (ret < 0) { | |
0fd73091 | 1792 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, path); |
6e590161 | 1793 | return -1; |
1794 | } | |
1795 | ||
86530b0a | 1796 | DEBUG("Mounted pts device \"%s\" onto \"%s\"", console->name, path); |
7c6ef2a2 SH |
1797 | return 0; |
1798 | } | |
1799 | ||
3d7d929a | 1800 | static int lxc_setup_ttydir_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1801 | const struct lxc_terminal *console, |
3d7d929a | 1802 | char *ttydir) |
7c6ef2a2 | 1803 | { |
3b7e332f | 1804 | int ret; |
6b5a54cd | 1805 | char path[PATH_MAX], lxcpath[PATH_MAX]; |
86530b0a | 1806 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
7c6ef2a2 | 1807 | |
3dc035f1 L |
1808 | if (console->path && !strcmp(console->path, "none")) |
1809 | return 0; | |
1810 | ||
7c6ef2a2 | 1811 | /* create rootfs/dev/<ttydir> directory */ |
86530b0a | 1812 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs_path, ttydir); |
3d7d929a | 1813 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1814 | return -1; |
3d7d929a | 1815 | |
7c6ef2a2 SH |
1816 | ret = mkdir(path, 0755); |
1817 | if (ret && errno != EEXIST) { | |
0fd73091 | 1818 | SYSERROR("Failed to create \"%s\"", path); |
3d7d929a | 1819 | return -errno; |
7c6ef2a2 | 1820 | } |
4742cd9a | 1821 | DEBUG("Created directory for console and tty devices at \"%s\"", path); |
7c6ef2a2 | 1822 | |
86530b0a | 1823 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", rootfs_path, ttydir); |
3d7d929a CB |
1824 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
1825 | return -1; | |
1826 | ||
3b7e332f CB |
1827 | ret = mknod(lxcpath, S_IFREG | 0000, 0); |
1828 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1829 | SYSERROR("Failed to create \"%s\"", lxcpath); |
3d7d929a | 1830 | return -errno; |
7c6ef2a2 | 1831 | } |
7c6ef2a2 | 1832 | |
86530b0a | 1833 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3dc035f1 | 1834 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1835 | return -1; |
2a12fefd | 1836 | |
3dc035f1 | 1837 | if (file_exists(path)) { |
a7ba3c7f | 1838 | ret = lxc_unstack_mountpoint(path, false); |
2a12fefd | 1839 | if (ret < 0) { |
6d1400b5 | 1840 | SYSERROR("Failed to unmount \"%s\"", path); |
a7ba3c7f CB |
1841 | return -ret; |
1842 | } else { | |
86530b0a | 1843 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1844 | } |
3dc035f1 | 1845 | } |
2a12fefd | 1846 | |
3b7e332f CB |
1847 | ret = mknod(path, S_IFREG | 0000, 0); |
1848 | if (ret < 0 && errno != EEXIST) { | |
1849 | SYSERROR("Failed to create console"); | |
1850 | return -errno; | |
7c6ef2a2 SH |
1851 | } |
1852 | ||
e581b9b5 | 1853 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP); |
86530b0a | 1854 | if (ret < 0) { |
0fd73091 | 1855 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
e581b9b5 | 1856 | S_IXUSR | S_IXGRP, console->name); |
2a12fefd CB |
1857 | return -errno; |
1858 | } | |
1859 | ||
3dc035f1 | 1860 | /* bind mount console->name to '/dev/<ttydir>/console' */ |
86530b0a L |
1861 | ret = safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs_path); |
1862 | if (ret < 0) { | |
0fd73091 | 1863 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
7c6ef2a2 SH |
1864 | return -1; |
1865 | } | |
86530b0a | 1866 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1867 | |
1868 | /* bind mount '/dev/<ttydir>/console' to '/dev/console' */ | |
86530b0a L |
1869 | ret = safe_mount(lxcpath, path, "none", MS_BIND, 0, rootfs_path); |
1870 | if (ret < 0) { | |
0fd73091 | 1871 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1872 | return -1; |
1873 | } | |
86530b0a | 1874 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 | 1875 | |
86530b0a | 1876 | DEBUG("Console has been setup under \"%s\" and mounted to \"%s\"", lxcpath, path); |
6e590161 | 1877 | return 0; |
1878 | } | |
1879 | ||
3d7d929a | 1880 | static int lxc_setup_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1881 | const struct lxc_terminal *console, char *ttydir) |
7c6ef2a2 | 1882 | { |
3d7d929a | 1883 | |
7c6ef2a2 | 1884 | if (!ttydir) |
3d7d929a | 1885 | return lxc_setup_dev_console(rootfs, console); |
7c6ef2a2 | 1886 | |
3d7d929a | 1887 | return lxc_setup_ttydir_console(rootfs, console, ttydir); |
7c6ef2a2 SH |
1888 | } |
1889 | ||
efed99a4 | 1890 | static void parse_mntopt(char *opt, unsigned long *flags, char **data, size_t size) |
998ac676 RT |
1891 | { |
1892 | struct mount_opt *mo; | |
1893 | ||
1894 | /* If opt is found in mount_opt, set or clear flags. | |
1895 | * Otherwise append it to data. */ | |
1896 | ||
1897 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
0fd73091 | 1898 | if (strncmp(opt, mo->name, strlen(mo->name)) == 0) { |
998ac676 RT |
1899 | if (mo->clear) |
1900 | *flags &= ~mo->flag; | |
1901 | else | |
1902 | *flags |= mo->flag; | |
1903 | return; | |
1904 | } | |
1905 | } | |
1906 | ||
f1e05b90 DJ |
1907 | if (strlen(*data)) |
1908 | (void)strlcat(*data, ",", size); | |
efed99a4 | 1909 | |
f1e05b90 | 1910 | (void)strlcat(*data, opt, size); |
998ac676 RT |
1911 | } |
1912 | ||
0fd73091 | 1913 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, char **mntdata) |
998ac676 | 1914 | { |
0fd73091 | 1915 | char *data, *p, *s; |
efed99a4 | 1916 | size_t size; |
998ac676 | 1917 | |
911324ef | 1918 | *mntdata = NULL; |
91656ce5 | 1919 | *mntflags = 0L; |
911324ef DL |
1920 | |
1921 | if (!mntopts) | |
998ac676 RT |
1922 | return 0; |
1923 | ||
911324ef | 1924 | s = strdup(mntopts); |
0fd73091 | 1925 | if (!s) |
998ac676 | 1926 | return -1; |
998ac676 | 1927 | |
efed99a4 DJ |
1928 | size = strlen(s) + 1; |
1929 | data = malloc(size); | |
998ac676 | 1930 | if (!data) { |
998ac676 RT |
1931 | free(s); |
1932 | return -1; | |
1933 | } | |
1934 | *data = 0; | |
1935 | ||
8db9d26f | 1936 | lxc_iterate_parts(p, s, ",") |
efed99a4 | 1937 | parse_mntopt(p, mntflags, &data, size); |
998ac676 RT |
1938 | |
1939 | if (*data) | |
1940 | *mntdata = data; | |
1941 | else | |
1942 | free(data); | |
1943 | free(s); | |
1944 | ||
1945 | return 0; | |
1946 | } | |
1947 | ||
d840039e YT |
1948 | static void parse_propagationopt(char *opt, unsigned long *flags) |
1949 | { | |
1950 | struct mount_opt *mo; | |
1951 | ||
1952 | /* If opt is found in propagation_opt, set or clear flags. */ | |
d840039e | 1953 | for (mo = &propagation_opt[0]; mo->name != NULL; mo++) { |
0fd73091 CB |
1954 | if (strncmp(opt, mo->name, strlen(mo->name)) != 0) |
1955 | continue; | |
1956 | ||
1957 | if (mo->clear) | |
1958 | *flags &= ~mo->flag; | |
1959 | else | |
1960 | *flags |= mo->flag; | |
1961 | ||
1962 | return; | |
d840039e YT |
1963 | } |
1964 | } | |
1965 | ||
8ce1abc2 | 1966 | int parse_propagationopts(const char *mntopts, unsigned long *pflags) |
d840039e | 1967 | { |
0fd73091 | 1968 | char *p, *s; |
d840039e YT |
1969 | |
1970 | if (!mntopts) | |
1971 | return 0; | |
1972 | ||
1973 | s = strdup(mntopts); | |
1974 | if (!s) { | |
1975 | SYSERROR("Failed to allocate memory"); | |
1976 | return -ENOMEM; | |
1977 | } | |
1978 | ||
0fd73091 | 1979 | *pflags = 0L; |
8db9d26f | 1980 | lxc_iterate_parts(p, s, ",") |
d840039e | 1981 | parse_propagationopt(p, pflags); |
d840039e | 1982 | free(s); |
0fd73091 | 1983 | |
d840039e YT |
1984 | return 0; |
1985 | } | |
1986 | ||
6fd5e769 SH |
1987 | static void null_endofword(char *word) |
1988 | { | |
1989 | while (*word && *word != ' ' && *word != '\t') | |
1990 | word++; | |
1991 | *word = '\0'; | |
1992 | } | |
1993 | ||
0fd73091 | 1994 | /* skip @nfields spaces in @src */ |
6fd5e769 SH |
1995 | static char *get_field(char *src, int nfields) |
1996 | { | |
6fd5e769 | 1997 | int i; |
0fd73091 | 1998 | char *p = src; |
6fd5e769 SH |
1999 | |
2000 | for (i = 0; i < nfields; i++) { | |
2001 | while (*p && *p != ' ' && *p != '\t') | |
2002 | p++; | |
0fd73091 | 2003 | |
6fd5e769 SH |
2004 | if (!*p) |
2005 | break; | |
0fd73091 | 2006 | |
6fd5e769 SH |
2007 | p++; |
2008 | } | |
0fd73091 | 2009 | |
6fd5e769 SH |
2010 | return p; |
2011 | } | |
2012 | ||
911324ef DL |
2013 | static int mount_entry(const char *fsname, const char *target, |
2014 | const char *fstype, unsigned long mountflags, | |
d840039e YT |
2015 | unsigned long pflags, const char *data, bool optional, |
2016 | bool dev, bool relative, const char *rootfs) | |
911324ef | 2017 | { |
0ac4b28a | 2018 | int ret; |
6b5a54cd | 2019 | char srcbuf[PATH_MAX]; |
181437fd | 2020 | const char *srcpath = fsname; |
614305f3 | 2021 | #ifdef HAVE_STATVFS |
2938f7c8 | 2022 | struct statvfs sb; |
614305f3 | 2023 | #endif |
2938f7c8 | 2024 | |
181437fd | 2025 | if (relative) { |
6b5a54cd CB |
2026 | ret = snprintf(srcbuf, PATH_MAX, "%s/%s", rootfs ? rootfs : "/", fsname ? fsname : ""); |
2027 | if (ret < 0 || ret >= PATH_MAX) { | |
181437fd YT |
2028 | ERROR("source path is too long"); |
2029 | return -1; | |
2030 | } | |
2031 | srcpath = srcbuf; | |
2032 | } | |
2033 | ||
2034 | ret = safe_mount(srcpath, target, fstype, mountflags & ~MS_REMOUNT, data, | |
0ac4b28a CB |
2035 | rootfs); |
2036 | if (ret < 0) { | |
1fc64d22 | 2037 | if (optional) { |
7874d81a | 2038 | SYSINFO("Failed to mount \"%s\" on \"%s\" (optional)", |
2039 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
2040 | return 0; |
2041 | } | |
0ac4b28a | 2042 | |
0103eb53 | 2043 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2044 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2045 | return -1; |
911324ef DL |
2046 | } |
2047 | ||
2048 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
7c5b6e7c | 2049 | unsigned long rqd_flags = 0; |
0ac4b28a CB |
2050 | |
2051 | DEBUG("Remounting \"%s\" on \"%s\" to respect bind or remount " | |
181437fd | 2052 | "options", srcpath ? srcpath : "(none)", target ? target : "(none)"); |
0ac4b28a | 2053 | |
7c5b6e7c AS |
2054 | if (mountflags & MS_RDONLY) |
2055 | rqd_flags |= MS_RDONLY; | |
614305f3 | 2056 | #ifdef HAVE_STATVFS |
181437fd | 2057 | if (srcpath && statvfs(srcpath, &sb) == 0) { |
7c5b6e7c | 2058 | unsigned long required_flags = rqd_flags; |
0ac4b28a | 2059 | |
2938f7c8 SH |
2060 | if (sb.f_flag & MS_NOSUID) |
2061 | required_flags |= MS_NOSUID; | |
0ac4b28a | 2062 | |
ae7a770e | 2063 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 | 2064 | required_flags |= MS_NODEV; |
0ac4b28a | 2065 | |
2938f7c8 SH |
2066 | if (sb.f_flag & MS_RDONLY) |
2067 | required_flags |= MS_RDONLY; | |
0ac4b28a | 2068 | |
2938f7c8 SH |
2069 | if (sb.f_flag & MS_NOEXEC) |
2070 | required_flags |= MS_NOEXEC; | |
0ac4b28a CB |
2071 | |
2072 | DEBUG("Flags for \"%s\" were %lu, required extra flags " | |
181437fd | 2073 | "are %lu", srcpath, sb.f_flag, required_flags); |
0ac4b28a CB |
2074 | |
2075 | /* If this was a bind mount request, and required_flags | |
2938f7c8 | 2076 | * does not have any flags which are not already in |
0ac4b28a | 2077 | * mountflags, then skip the remount. |
2938f7c8 SH |
2078 | */ |
2079 | if (!(mountflags & MS_REMOUNT)) { | |
0ac4b28a CB |
2080 | if (!(required_flags & ~mountflags) && |
2081 | rqd_flags == 0) { | |
2082 | DEBUG("Mountflags already were %lu, " | |
2083 | "skipping remount", mountflags); | |
2938f7c8 SH |
2084 | goto skipremount; |
2085 | } | |
2086 | } | |
0ac4b28a | 2087 | |
2938f7c8 | 2088 | mountflags |= required_flags; |
6fd5e769 | 2089 | } |
614305f3 | 2090 | #endif |
911324ef | 2091 | |
181437fd | 2092 | ret = mount(srcpath, target, fstype, mountflags | MS_REMOUNT, data); |
0ac4b28a | 2093 | if (ret < 0) { |
1fc64d22 | 2094 | if (optional) { |
7874d81a | 2095 | SYSINFO("Failed to mount \"%s\" on \"%s\" (optional)", |
2096 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
2097 | return 0; |
2098 | } | |
0ac4b28a | 2099 | |
0103eb53 | 2100 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2101 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2102 | return -1; |
911324ef DL |
2103 | } |
2104 | } | |
2105 | ||
d840039e YT |
2106 | if (pflags) { |
2107 | ret = mount(NULL, target, NULL, pflags, NULL); | |
2108 | if (ret < 0) { | |
2109 | if (optional) { | |
7874d81a | 2110 | SYSINFO("Failed to change mount propagation " |
2111 | "for \"%s\" (optional)", target); | |
d840039e YT |
2112 | return 0; |
2113 | } else { | |
2114 | SYSERROR("Failed to change mount propagation " | |
2115 | "for \"%s\" (optional)", target); | |
2116 | return -1; | |
2117 | } | |
2118 | } | |
2119 | DEBUG("Changed mount propagation for \"%s\"", target); | |
2120 | } | |
2121 | ||
2122 | ||
614305f3 | 2123 | #ifdef HAVE_STATVFS |
6fd5e769 | 2124 | skipremount: |
614305f3 | 2125 | #endif |
0103eb53 | 2126 | DEBUG("Mounted \"%s\" on \"%s\" with filesystem type \"%s\"", |
181437fd | 2127 | srcpath ? srcpath : "(null)", target, fstype); |
911324ef DL |
2128 | |
2129 | return 0; | |
2130 | } | |
2131 | ||
c5e30de4 | 2132 | /* Remove "optional", "create=dir", and "create=file" from mntopt */ |
4e4ca161 SH |
2133 | static void cull_mntent_opt(struct mntent *mntent) |
2134 | { | |
2135 | int i; | |
0fd73091 CB |
2136 | char *list[] = { |
2137 | "create=dir", | |
2138 | "create=file", | |
2139 | "optional", | |
2140 | "relative", | |
2141 | NULL | |
2142 | }; | |
c5e30de4 CB |
2143 | |
2144 | for (i = 0; list[i]; i++) { | |
2145 | char *p, *p2; | |
2146 | ||
2147 | p = strstr(mntent->mnt_opts, list[i]); | |
2148 | if (!p) | |
4e4ca161 | 2149 | continue; |
c5e30de4 | 2150 | |
4e4ca161 SH |
2151 | p2 = strchr(p, ','); |
2152 | if (!p2) { | |
2153 | /* no more mntopts, so just chop it here */ | |
2154 | *p = '\0'; | |
2155 | continue; | |
2156 | } | |
c5e30de4 CB |
2157 | |
2158 | memmove(p, p2 + 1, strlen(p2 + 1) + 1); | |
4e4ca161 SH |
2159 | } |
2160 | } | |
2161 | ||
4d5b72a1 | 2162 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
749f98d9 CB |
2163 | const char *path, |
2164 | const struct lxc_rootfs *rootfs, | |
0fd73091 | 2165 | const char *lxc_name, const char *lxc_path) |
0ad19a3f | 2166 | { |
3b7e332f | 2167 | int ret; |
12e6ab5d | 2168 | char *p1, *p2; |
911324ef | 2169 | |
12e6ab5d | 2170 | if (strncmp(mntent->mnt_type, "overlay", 7) == 0) { |
749f98d9 | 2171 | ret = ovl_mkdir(mntent, rootfs, lxc_name, lxc_path); |
12e6ab5d CB |
2172 | if (ret < 0) |
2173 | return -1; | |
2174 | } | |
6e46cc0d | 2175 | |
34cfffb3 | 2176 | if (hasmntopt(mntent, "create=dir")) { |
749f98d9 CB |
2177 | ret = mkdir_p(path, 0755); |
2178 | if (ret < 0 && errno != EEXIST) { | |
2179 | SYSERROR("Failed to create directory \"%s\"", path); | |
2180 | return -1; | |
34cfffb3 SG |
2181 | } |
2182 | } | |
2183 | ||
0fd73091 CB |
2184 | if (!hasmntopt(mntent, "create=file")) |
2185 | return 0; | |
749f98d9 | 2186 | |
0fd73091 CB |
2187 | ret = access(path, F_OK); |
2188 | if (ret == 0) | |
2189 | return 0; | |
749f98d9 | 2190 | |
0fd73091 CB |
2191 | p1 = strdup(path); |
2192 | if (!p1) | |
2193 | return -1; | |
749f98d9 | 2194 | |
0fd73091 | 2195 | p2 = dirname(p1); |
749f98d9 | 2196 | |
0fd73091 CB |
2197 | ret = mkdir_p(p2, 0755); |
2198 | free(p1); | |
2199 | if (ret < 0 && errno != EEXIST) { | |
2200 | SYSERROR("Failed to create directory \"%s\"", path); | |
2201 | return -1; | |
34cfffb3 | 2202 | } |
749f98d9 | 2203 | |
3b7e332f CB |
2204 | ret = mknod(path, S_IFREG | 0000, 0); |
2205 | if (ret < 0 && errno != EEXIST) | |
2206 | return -errno; | |
0fd73091 | 2207 | |
749f98d9 | 2208 | return 0; |
4d5b72a1 NC |
2209 | } |
2210 | ||
ec50007f CB |
2211 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
2212 | * without a rootfs. */ | |
db4aba38 | 2213 | static inline int mount_entry_on_generic(struct mntent *mntent, |
d8b712bc CB |
2214 | const char *path, |
2215 | const struct lxc_rootfs *rootfs, | |
2216 | const char *lxc_name, | |
2217 | const char *lxc_path) | |
4d5b72a1 | 2218 | { |
d8b712bc | 2219 | int ret; |
949d0338 | 2220 | unsigned long mntflags; |
4d5b72a1 | 2221 | char *mntdata; |
181437fd | 2222 | bool dev, optional, relative; |
949d0338 | 2223 | unsigned long pflags = 0; |
ec50007f | 2224 | char *rootfs_path = NULL; |
d8b712bc CB |
2225 | |
2226 | optional = hasmntopt(mntent, "optional") != NULL; | |
2227 | dev = hasmntopt(mntent, "dev") != NULL; | |
181437fd | 2228 | relative = hasmntopt(mntent, "relative") != NULL; |
d8b712bc | 2229 | |
ec50007f CB |
2230 | if (rootfs && rootfs->path) |
2231 | rootfs_path = rootfs->mount; | |
2232 | ||
d8b712bc CB |
2233 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, |
2234 | lxc_path); | |
2235 | if (ret < 0) { | |
2236 | if (optional) | |
2237 | return 0; | |
608e3567 | 2238 | |
d8b712bc CB |
2239 | return -1; |
2240 | } | |
4e4ca161 SH |
2241 | cull_mntent_opt(mntent); |
2242 | ||
d840039e YT |
2243 | ret = parse_propagationopts(mntent->mnt_opts, &pflags); |
2244 | if (ret < 0) | |
2245 | return -1; | |
2246 | ||
d8b712bc CB |
2247 | ret = parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata); |
2248 | if (ret < 0) | |
a17b1e65 | 2249 | return -1; |
a17b1e65 | 2250 | |
6e46cc0d | 2251 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
d840039e | 2252 | pflags, mntdata, optional, dev, relative, rootfs_path); |
68c152ef | 2253 | |
911324ef | 2254 | free(mntdata); |
911324ef DL |
2255 | return ret; |
2256 | } | |
2257 | ||
db4aba38 NC |
2258 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
2259 | { | |
1433c9f9 | 2260 | int ret; |
6b5a54cd | 2261 | char path[PATH_MAX]; |
1433c9f9 CB |
2262 | |
2263 | /* For containers created without a rootfs all mounts are treated as | |
07667a6a CB |
2264 | * absolute paths starting at / on the host. |
2265 | */ | |
1433c9f9 CB |
2266 | if (mntent->mnt_dir[0] != '/') |
2267 | ret = snprintf(path, sizeof(path), "/%s", mntent->mnt_dir); | |
2268 | else | |
2269 | ret = snprintf(path, sizeof(path), "%s", mntent->mnt_dir); | |
07667a6a | 2270 | if (ret < 0 || ret >= sizeof(path)) |
1433c9f9 | 2271 | return -1; |
1433c9f9 CB |
2272 | |
2273 | return mount_entry_on_generic(mntent, path, NULL, NULL, NULL); | |
db4aba38 NC |
2274 | } |
2275 | ||
4e4ca161 | 2276 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 | 2277 | const struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2278 | const char *lxc_name, |
2279 | const char *lxc_path) | |
911324ef | 2280 | { |
bdd2b34c | 2281 | int offset; |
013bd428 | 2282 | char *aux; |
67e571de | 2283 | const char *lxcpath; |
6b5a54cd | 2284 | char path[PATH_MAX]; |
bdd2b34c | 2285 | int ret = 0; |
0ad19a3f | 2286 | |
593e8478 | 2287 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
bdd2b34c | 2288 | if (!lxcpath) |
2a59a681 | 2289 | return -1; |
2a59a681 | 2290 | |
bdd2b34c CB |
2291 | /* If rootfs->path is a blockdev path, allow container fstab to use |
2292 | * <lxcpath>/<name>/rootfs" as the target prefix. | |
2293 | */ | |
6b5a54cd CB |
2294 | ret = snprintf(path, PATH_MAX, "%s/%s/rootfs", lxcpath, lxc_name); |
2295 | if (ret < 0 || ret >= PATH_MAX) | |
80a881b2 SH |
2296 | goto skipvarlib; |
2297 | ||
2298 | aux = strstr(mntent->mnt_dir, path); | |
2299 | if (aux) { | |
2300 | offset = strlen(path); | |
2301 | goto skipabs; | |
2302 | } | |
2303 | ||
2304 | skipvarlib: | |
013bd428 DL |
2305 | aux = strstr(mntent->mnt_dir, rootfs->path); |
2306 | if (!aux) { | |
bdd2b34c | 2307 | WARN("Ignoring mount point \"%s\"", mntent->mnt_dir); |
db4aba38 | 2308 | return ret; |
013bd428 | 2309 | } |
80a881b2 SH |
2310 | offset = strlen(rootfs->path); |
2311 | ||
2312 | skipabs: | |
6b5a54cd CB |
2313 | ret = snprintf(path, PATH_MAX, "%s/%s", rootfs->mount, aux + offset); |
2314 | if (ret < 0 || ret >= PATH_MAX) | |
a17b1e65 | 2315 | return -1; |
a17b1e65 | 2316 | |
0a2dddd4 | 2317 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef | 2318 | } |
d330fe7b | 2319 | |
4e4ca161 | 2320 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
0a2dddd4 CB |
2321 | const struct lxc_rootfs *rootfs, |
2322 | const char *lxc_name, | |
2323 | const char *lxc_path) | |
911324ef | 2324 | { |
911324ef | 2325 | int ret; |
6b5a54cd | 2326 | char path[PATH_MAX]; |
d330fe7b | 2327 | |
34cfffb3 | 2328 | /* relative to root mount point */ |
6e46cc0d | 2329 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs->mount, mntent->mnt_dir); |
0fd73091 | 2330 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
9ba8130c | 2331 | return -1; |
911324ef | 2332 | |
0a2dddd4 | 2333 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef DL |
2334 | } |
2335 | ||
06749971 CB |
2336 | static int mount_file_entries(const struct lxc_conf *conf, |
2337 | const struct lxc_rootfs *rootfs, FILE *file, | |
1ae3c19f | 2338 | const char *lxc_name, const char *lxc_path) |
911324ef | 2339 | { |
aaf901be | 2340 | char buf[4096]; |
0fd73091 | 2341 | struct mntent mntent; |
911324ef | 2342 | int ret = -1; |
e76b8764 | 2343 | |
aaf901be | 2344 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
1ae3c19f CB |
2345 | if (!rootfs->path) |
2346 | ret = mount_entry_on_systemfs(&mntent); | |
2347 | else if (mntent.mnt_dir[0] != '/') | |
2348 | ret = mount_entry_on_relative_rootfs(&mntent, rootfs, | |
2349 | lxc_name, lxc_path); | |
2350 | else | |
2351 | ret = mount_entry_on_absolute_rootfs(&mntent, rootfs, | |
2352 | lxc_name, lxc_path); | |
2353 | if (ret < 0) | |
2354 | return -1; | |
0ad19a3f | 2355 | } |
2356 | ret = 0; | |
cd54d859 | 2357 | |
0fd73091 | 2358 | INFO("Finished setting up mounts"); |
e7938e9e MN |
2359 | return ret; |
2360 | } | |
2361 | ||
06749971 CB |
2362 | static int setup_mount(const struct lxc_conf *conf, |
2363 | const struct lxc_rootfs *rootfs, const char *fstab, | |
42dff448 | 2364 | const char *lxc_name, const char *lxc_path) |
e7938e9e | 2365 | { |
42dff448 | 2366 | FILE *f; |
e7938e9e MN |
2367 | int ret; |
2368 | ||
2369 | if (!fstab) | |
2370 | return 0; | |
2371 | ||
42dff448 CB |
2372 | f = setmntent(fstab, "r"); |
2373 | if (!f) { | |
2374 | SYSERROR("Failed to open \"%s\"", fstab); | |
e7938e9e MN |
2375 | return -1; |
2376 | } | |
2377 | ||
06749971 | 2378 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
42dff448 CB |
2379 | if (ret < 0) |
2380 | ERROR("Failed to set up mount entries"); | |
e7938e9e | 2381 | |
42dff448 | 2382 | endmntent(f); |
0ad19a3f | 2383 | return ret; |
2384 | } | |
2385 | ||
1800f924 WB |
2386 | /* |
2387 | * In order for nested containers to be able to mount /proc and /sys they need | |
2388 | * to see a "pure" proc and sysfs mount points with nothing mounted on top | |
2389 | * (like lxcfs). | |
2390 | * For this we provide proc and sysfs in /dev/.lxc/{proc,sys} while using an | |
2391 | * apparmor rule to deny access to them. This is mostly for convenience: The | |
2392 | * container's root user can mount them anyway and thus has access to the two | |
2393 | * file systems. But a non-root user in the container should not be allowed to | |
2394 | * access them as a side effect without explicitly allowing it. | |
2395 | */ | |
2396 | static const char nesting_helpers[] = | |
2397 | "proc dev/.lxc/proc proc create=dir,optional\n" | |
6333c915 | 2398 | "sys dev/.lxc/sys sysfs create=dir,optional\n"; |
1800f924 WB |
2399 | |
2400 | FILE *make_anonymous_mount_file(struct lxc_list *mount, | |
2401 | bool include_nesting_helpers) | |
e7938e9e | 2402 | { |
5ef5c9a3 | 2403 | int ret; |
e7938e9e | 2404 | char *mount_entry; |
5ef5c9a3 | 2405 | struct lxc_list *iterator; |
5ef5c9a3 CB |
2406 | int fd = -1; |
2407 | ||
0fd73091 | 2408 | fd = memfd_create(".lxc_mount_file", MFD_CLOEXEC); |
5ef5c9a3 | 2409 | if (fd < 0) { |
a324e7eb CB |
2410 | char template[] = P_tmpdir "/.lxc_mount_file_XXXXXX"; |
2411 | ||
5ef5c9a3 CB |
2412 | if (errno != ENOSYS) |
2413 | return NULL; | |
a324e7eb CB |
2414 | |
2415 | fd = lxc_make_tmpfile(template, true); | |
0fd73091 CB |
2416 | if (fd < 0) { |
2417 | SYSERROR("Could not create temporary mount file"); | |
2418 | return NULL; | |
2419 | } | |
2420 | ||
6bd04140 | 2421 | TRACE("Created temporary mount file"); |
5ef5c9a3 | 2422 | } |
e7938e9e | 2423 | |
0fd73091 CB |
2424 | lxc_list_for_each (iterator, mount) { |
2425 | size_t len; | |
2426 | ||
e7938e9e | 2427 | mount_entry = iterator->elem; |
0fd73091 | 2428 | len = strlen(mount_entry); |
5ef5c9a3 | 2429 | |
489f39be | 2430 | ret = lxc_write_nointr(fd, mount_entry, len); |
0fd73091 CB |
2431 | if (ret != len) |
2432 | goto on_error; | |
2433 | ||
489f39be | 2434 | ret = lxc_write_nointr(fd, "\n", 1); |
0fd73091 CB |
2435 | if (ret != 1) |
2436 | goto on_error; | |
e7938e9e MN |
2437 | } |
2438 | ||
1800f924 WB |
2439 | if (include_nesting_helpers) { |
2440 | ret = lxc_write_nointr(fd, nesting_helpers, | |
6333c915 CB |
2441 | STRARRAYLEN(nesting_helpers)); |
2442 | if (ret != STRARRAYLEN(nesting_helpers)) | |
1800f924 WB |
2443 | goto on_error; |
2444 | } | |
2445 | ||
0fd73091 CB |
2446 | ret = lseek(fd, 0, SEEK_SET); |
2447 | if (ret < 0) | |
2448 | goto on_error; | |
2449 | ||
2450 | return fdopen(fd, "r+"); | |
2451 | ||
2452 | on_error: | |
2453 | SYSERROR("Failed to write mount entry to temporary mount file"); | |
2454 | close(fd); | |
2455 | return NULL; | |
9fc7f8c0 TA |
2456 | } |
2457 | ||
06749971 CB |
2458 | static int setup_mount_entries(const struct lxc_conf *conf, |
2459 | const struct lxc_rootfs *rootfs, | |
5ef5c9a3 CB |
2460 | struct lxc_list *mount, const char *lxc_name, |
2461 | const char *lxc_path) | |
9fc7f8c0 | 2462 | { |
9fc7f8c0 | 2463 | int ret; |
0fd73091 | 2464 | FILE *f; |
9fc7f8c0 | 2465 | |
1800f924 | 2466 | f = make_anonymous_mount_file(mount, conf->lsm_aa_allow_nesting); |
19b5d755 | 2467 | if (!f) |
9fc7f8c0 | 2468 | return -1; |
e7938e9e | 2469 | |
06749971 | 2470 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
19b5d755 | 2471 | fclose(f); |
0fd73091 | 2472 | |
e7938e9e MN |
2473 | return ret; |
2474 | } | |
2475 | ||
bab88e68 CS |
2476 | static int parse_cap(const char *cap) |
2477 | { | |
84760c11 | 2478 | size_t i; |
2479 | int capid = -1; | |
0fd73091 CB |
2480 | size_t end = sizeof(caps_opt) / sizeof(caps_opt[0]); |
2481 | char *ptr = NULL; | |
bab88e68 | 2482 | |
0fd73091 | 2483 | if (strcmp(cap, "none") == 0) |
7035407c DE |
2484 | return -2; |
2485 | ||
8560cd36 | 2486 | for (i = 0; i < end; i++) { |
bab88e68 CS |
2487 | if (strcmp(cap, caps_opt[i].name)) |
2488 | continue; | |
2489 | ||
2490 | capid = caps_opt[i].value; | |
2491 | break; | |
2492 | } | |
2493 | ||
2494 | if (capid < 0) { | |
0fd73091 CB |
2495 | /* Try to see if it's numeric, so the user may specify |
2496 | * capabilities that the running kernel knows about but we | |
2497 | * don't | |
2498 | */ | |
bab88e68 CS |
2499 | errno = 0; |
2500 | capid = strtol(cap, &ptr, 10); | |
2501 | if (!ptr || *ptr != '\0' || errno != 0) | |
2502 | /* not a valid number */ | |
2503 | capid = -1; | |
2504 | else if (capid > lxc_caps_last_cap()) | |
2505 | /* we have a number but it's not a valid | |
2506 | * capability */ | |
2507 | capid = -1; | |
2508 | } | |
2509 | ||
2510 | return capid; | |
2511 | } | |
2512 | ||
0769b82a CS |
2513 | int in_caplist(int cap, struct lxc_list *caps) |
2514 | { | |
0769b82a | 2515 | int capid; |
0fd73091 | 2516 | struct lxc_list *iterator; |
0769b82a | 2517 | |
0fd73091 | 2518 | lxc_list_for_each (iterator, caps) { |
0769b82a CS |
2519 | capid = parse_cap(iterator->elem); |
2520 | if (capid == cap) | |
2521 | return 1; | |
2522 | } | |
2523 | ||
2524 | return 0; | |
2525 | } | |
2526 | ||
81810dd1 DL |
2527 | static int setup_caps(struct lxc_list *caps) |
2528 | { | |
bab88e68 | 2529 | int capid; |
0fd73091 CB |
2530 | char *drop_entry; |
2531 | struct lxc_list *iterator; | |
81810dd1 | 2532 | |
0fd73091 CB |
2533 | lxc_list_for_each (iterator, caps) { |
2534 | int ret; | |
81810dd1 DL |
2535 | |
2536 | drop_entry = iterator->elem; | |
2537 | ||
bab88e68 | 2538 | capid = parse_cap(drop_entry); |
0fd73091 | 2539 | if (capid < 0) { |
1e11be34 DL |
2540 | ERROR("unknown capability %s", drop_entry); |
2541 | return -1; | |
81810dd1 DL |
2542 | } |
2543 | ||
b81689a1 CB |
2544 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(capid), prctl_arg(0), |
2545 | prctl_arg(0), prctl_arg(0)); | |
0fd73091 CB |
2546 | if (ret < 0) { |
2547 | SYSERROR("Failed to remove %s capability", drop_entry); | |
3ec1648d SH |
2548 | return -1; |
2549 | } | |
0fd73091 | 2550 | DEBUG("Dropped %s (%d) capability", drop_entry, capid); |
81810dd1 DL |
2551 | } |
2552 | ||
0fd73091 | 2553 | DEBUG("Capabilities have been setup"); |
1fb86a7c SH |
2554 | return 0; |
2555 | } | |
2556 | ||
2557 | static int dropcaps_except(struct lxc_list *caps) | |
2558 | { | |
0fd73091 | 2559 | int i, capid, numcaps; |
1fb86a7c | 2560 | char *keep_entry; |
0fd73091 | 2561 | struct lxc_list *iterator; |
1fb86a7c | 2562 | |
0fd73091 | 2563 | numcaps = lxc_caps_last_cap() + 1; |
2caf9a97 SH |
2564 | if (numcaps <= 0 || numcaps > 200) |
2565 | return -1; | |
0fd73091 | 2566 | TRACE("Found %d capabilities", numcaps); |
2caf9a97 | 2567 | |
1a0e70ac | 2568 | /* caplist[i] is 1 if we keep capability i */ |
1fb86a7c SH |
2569 | int *caplist = alloca(numcaps * sizeof(int)); |
2570 | memset(caplist, 0, numcaps * sizeof(int)); | |
2571 | ||
0fd73091 | 2572 | lxc_list_for_each (iterator, caps) { |
1fb86a7c SH |
2573 | keep_entry = iterator->elem; |
2574 | ||
bab88e68 | 2575 | capid = parse_cap(keep_entry); |
7035407c DE |
2576 | if (capid == -2) |
2577 | continue; | |
2578 | ||
0fd73091 CB |
2579 | if (capid < 0) { |
2580 | ERROR("Unknown capability %s", keep_entry); | |
1fb86a7c SH |
2581 | return -1; |
2582 | } | |
2583 | ||
0fd73091 | 2584 | DEBUG("Keep capability %s (%d)", keep_entry, capid); |
1fb86a7c SH |
2585 | caplist[capid] = 1; |
2586 | } | |
0fd73091 CB |
2587 | |
2588 | for (i = 0; i < numcaps; i++) { | |
2589 | int ret; | |
2590 | ||
1fb86a7c SH |
2591 | if (caplist[i]) |
2592 | continue; | |
0fd73091 | 2593 | |
b81689a1 CB |
2594 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(i), prctl_arg(0), |
2595 | prctl_arg(0), prctl_arg(0)); | |
0fd73091 CB |
2596 | if (ret < 0) { |
2597 | SYSERROR("Failed to remove capability %d", i); | |
3ec1648d SH |
2598 | return -1; |
2599 | } | |
1fb86a7c SH |
2600 | } |
2601 | ||
0fd73091 | 2602 | DEBUG("Capabilities have been setup"); |
81810dd1 DL |
2603 | return 0; |
2604 | } | |
2605 | ||
0fd73091 CB |
2606 | static int parse_resource(const char *res) |
2607 | { | |
2608 | int ret; | |
c6d09e15 WB |
2609 | size_t i; |
2610 | int resid = -1; | |
2611 | ||
0fd73091 | 2612 | for (i = 0; i < sizeof(limit_opt) / sizeof(limit_opt[0]); ++i) |
c6d09e15 WB |
2613 | if (strcmp(res, limit_opt[i].name) == 0) |
2614 | return limit_opt[i].value; | |
c6d09e15 | 2615 | |
0fd73091 | 2616 | /* Try to see if it's numeric, so the user may specify |
c6d09e15 | 2617 | * resources that the running kernel knows about but |
0fd73091 CB |
2618 | * we don't. |
2619 | */ | |
2620 | ret = lxc_safe_int(res, &resid); | |
2621 | if (ret < 0) | |
2622 | return -1; | |
2623 | ||
2624 | return resid; | |
c6d09e15 WB |
2625 | } |
2626 | ||
0fd73091 CB |
2627 | int setup_resource_limits(struct lxc_list *limits, pid_t pid) |
2628 | { | |
2629 | int resid; | |
c6d09e15 WB |
2630 | struct lxc_list *it; |
2631 | struct lxc_limit *lim; | |
c6d09e15 | 2632 | |
0fd73091 | 2633 | lxc_list_for_each (it, limits) { |
c6d09e15 WB |
2634 | lim = it->elem; |
2635 | ||
2636 | resid = parse_resource(lim->resource); | |
2637 | if (resid < 0) { | |
0fd73091 | 2638 | ERROR("Unknown resource %s", lim->resource); |
c6d09e15 WB |
2639 | return -1; |
2640 | } | |
2641 | ||
f48b5fd8 | 2642 | #if HAVE_PRLIMIT || HAVE_PRLIMIT64 |
c6d09e15 | 2643 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) { |
6d1400b5 | 2644 | SYSERROR("Failed to set limit %s", lim->resource); |
c6d09e15 WB |
2645 | return -1; |
2646 | } | |
2de12765 CB |
2647 | |
2648 | TRACE("Setup \"%s\" limit", lim->resource); | |
f48b5fd8 | 2649 | #else |
2de12765 | 2650 | ERROR("Cannot set limit \"%s\" as prlimit is missing", lim->resource); |
f48b5fd8 FF |
2651 | return -1; |
2652 | #endif | |
c6d09e15 | 2653 | } |
0fd73091 | 2654 | |
c6d09e15 WB |
2655 | return 0; |
2656 | } | |
2657 | ||
7edd0540 L |
2658 | int setup_sysctl_parameters(struct lxc_list *sysctls) |
2659 | { | |
2660 | struct lxc_list *it; | |
2661 | struct lxc_sysctl *elem; | |
0fd73091 | 2662 | int ret = 0; |
7edd0540 | 2663 | char *tmp = NULL; |
6b5a54cd | 2664 | char filename[PATH_MAX] = {0}; |
7edd0540 | 2665 | |
0fd73091 | 2666 | lxc_list_for_each (it, sysctls) { |
7edd0540 L |
2667 | elem = it->elem; |
2668 | tmp = lxc_string_replace(".", "/", elem->key); | |
2669 | if (!tmp) { | |
2670 | ERROR("Failed to replace key %s", elem->key); | |
2671 | return -1; | |
2672 | } | |
2673 | ||
2674 | ret = snprintf(filename, sizeof(filename), "/proc/sys/%s", tmp); | |
2675 | free(tmp); | |
2676 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { | |
2677 | ERROR("Error setting up sysctl parameters path"); | |
2678 | return -1; | |
2679 | } | |
2680 | ||
0fd73091 | 2681 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2682 | strlen(elem->value), false, 0666); |
7edd0540 | 2683 | if (ret < 0) { |
0fd73091 CB |
2684 | ERROR("Failed to setup sysctl parameters %s to %s", |
2685 | elem->key, elem->value); | |
7edd0540 L |
2686 | return -1; |
2687 | } | |
2688 | } | |
0fd73091 | 2689 | |
7edd0540 L |
2690 | return 0; |
2691 | } | |
2692 | ||
61d7a733 YT |
2693 | int setup_proc_filesystem(struct lxc_list *procs, pid_t pid) |
2694 | { | |
2695 | struct lxc_list *it; | |
2696 | struct lxc_proc *elem; | |
0fd73091 | 2697 | int ret = 0; |
61d7a733 | 2698 | char *tmp = NULL; |
6b5a54cd | 2699 | char filename[PATH_MAX] = {0}; |
61d7a733 | 2700 | |
0fd73091 | 2701 | lxc_list_for_each (it, procs) { |
61d7a733 YT |
2702 | elem = it->elem; |
2703 | tmp = lxc_string_replace(".", "/", elem->filename); | |
2704 | if (!tmp) { | |
2705 | ERROR("Failed to replace key %s", elem->filename); | |
2706 | return -1; | |
2707 | } | |
2708 | ||
2709 | ret = snprintf(filename, sizeof(filename), "/proc/%d/%s", pid, tmp); | |
2710 | free(tmp); | |
2711 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { | |
2712 | ERROR("Error setting up proc filesystem path"); | |
2713 | return -1; | |
2714 | } | |
2715 | ||
0fd73091 | 2716 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2717 | strlen(elem->value), false, 0666); |
61d7a733 | 2718 | if (ret < 0) { |
0fd73091 CB |
2719 | ERROR("Failed to setup proc filesystem %s to %s", |
2720 | elem->filename, elem->value); | |
61d7a733 YT |
2721 | return -1; |
2722 | } | |
2723 | } | |
0fd73091 | 2724 | |
61d7a733 YT |
2725 | return 0; |
2726 | } | |
2727 | ||
ae9242c8 SH |
2728 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2729 | ||
7b379ab3 | 2730 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2731 | { |
26ddeedd | 2732 | int i; |
0fd73091 | 2733 | struct lxc_conf *new; |
7b379ab3 | 2734 | |
13277ec4 | 2735 | new = malloc(sizeof(*new)); |
0fd73091 | 2736 | if (!new) |
7b379ab3 | 2737 | return NULL; |
7b379ab3 MN |
2738 | memset(new, 0, sizeof(*new)); |
2739 | ||
4b73005c | 2740 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
cccc74b5 | 2741 | new->personality = -1; |
124fa0a8 | 2742 | new->autodev = 1; |
3a784510 | 2743 | new->console.buffer_size = 0; |
596a818d DE |
2744 | new->console.log_path = NULL; |
2745 | new->console.log_fd = -1; | |
861813e5 | 2746 | new->console.log_size = 0; |
28a4b0e5 | 2747 | new->console.path = NULL; |
63376d7d | 2748 | new->console.peer = -1; |
fb87aa6a CB |
2749 | new->console.proxy.busy = -1; |
2750 | new->console.proxy.master = -1; | |
2751 | new->console.proxy.slave = -1; | |
63376d7d DL |
2752 | new->console.master = -1; |
2753 | new->console.slave = -1; | |
2754 | new->console.name[0] = '\0'; | |
732375f5 | 2755 | memset(&new->console.ringbuf, 0, sizeof(struct lxc_ringbuf)); |
d2e30e99 | 2756 | new->maincmd_fd = -1; |
258f8051 | 2757 | new->monitor_signal_pdeath = SIGKILL; |
76a26f55 | 2758 | new->nbd_idx = -1; |
54c30e29 | 2759 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 2760 | if (!new->rootfs.mount) { |
53f3f048 SH |
2761 | free(new); |
2762 | return NULL; | |
2763 | } | |
6e54330c | 2764 | new->rootfs.managed = true; |
858377e4 | 2765 | new->logfd = -1; |
7b379ab3 | 2766 | lxc_list_init(&new->cgroup); |
54860ed0 | 2767 | lxc_list_init(&new->cgroup2); |
7b379ab3 MN |
2768 | lxc_list_init(&new->network); |
2769 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2770 | lxc_list_init(&new->caps); |
1fb86a7c | 2771 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2772 | lxc_list_init(&new->id_map); |
46ad64ab CB |
2773 | new->root_nsuid_map = NULL; |
2774 | new->root_nsgid_map = NULL; | |
f979ac15 | 2775 | lxc_list_init(&new->includes); |
4184c3e1 | 2776 | lxc_list_init(&new->aliens); |
7c661726 | 2777 | lxc_list_init(&new->environment); |
c6d09e15 | 2778 | lxc_list_init(&new->limits); |
7edd0540 | 2779 | lxc_list_init(&new->sysctls); |
61d7a733 | 2780 | lxc_list_init(&new->procs); |
44ae0fb6 | 2781 | new->hooks_version = 0; |
28d9e29e | 2782 | for (i = 0; i < NUM_LXC_HOOKS; i++) |
26ddeedd | 2783 | lxc_list_init(&new->hooks[i]); |
ee1e7aa0 | 2784 | lxc_list_init(&new->groups); |
d39b10eb | 2785 | lxc_list_init(&new->state_clients); |
fe4de9a6 | 2786 | new->lsm_aa_profile = NULL; |
1800f924 | 2787 | lxc_list_init(&new->lsm_aa_raw); |
fe4de9a6 | 2788 | new->lsm_se_context = NULL; |
7a0bcca3 | 2789 | new->tmp_umount_proc = false; |
7a41e857 LT |
2790 | new->tmp_umount_proc = 0; |
2791 | new->shmount.path_host = NULL; | |
2792 | new->shmount.path_cont = NULL; | |
7b379ab3 | 2793 | |
72bb04e4 PT |
2794 | /* if running in a new user namespace, init and COMMAND |
2795 | * default to running as UID/GID 0 when using lxc-execute */ | |
2796 | new->init_uid = 0; | |
2797 | new->init_gid = 0; | |
43654d34 | 2798 | memset(&new->cgroup_meta, 0, sizeof(struct lxc_cgroup)); |
b074bbf1 | 2799 | memset(&new->ns_share, 0, sizeof(char *) * LXC_NS_MAX); |
72bb04e4 | 2800 | |
7b379ab3 | 2801 | return new; |
089cd8b8 DL |
2802 | } |
2803 | ||
344c9d81 | 2804 | int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
a19b974f | 2805 | size_t buf_size) |
f6d3e3e4 | 2806 | { |
29053180 | 2807 | int fd, ret; |
6b5a54cd | 2808 | char path[PATH_MAX]; |
f6d3e3e4 | 2809 | |
a19b974f CB |
2810 | if (geteuid() != 0 && idtype == ID_TYPE_GID) { |
2811 | size_t buflen; | |
2812 | ||
6b5a54cd CB |
2813 | ret = snprintf(path, PATH_MAX, "/proc/%d/setgroups", pid); |
2814 | if (ret < 0 || ret >= PATH_MAX) | |
a19b974f | 2815 | return -E2BIG; |
a19b974f CB |
2816 | |
2817 | fd = open(path, O_WRONLY); | |
2818 | if (fd < 0 && errno != ENOENT) { | |
2819 | SYSERROR("Failed to open \"%s\"", path); | |
2820 | return -1; | |
2821 | } | |
2822 | ||
2388737b | 2823 | if (fd >= 0) { |
6333c915 | 2824 | buflen = STRLITERALLEN("deny\n"); |
2388737b CB |
2825 | errno = 0; |
2826 | ret = lxc_write_nointr(fd, "deny\n", buflen); | |
395b1a3e | 2827 | close(fd); |
2388737b | 2828 | if (ret != buflen) { |
0fd73091 CB |
2829 | SYSERROR("Failed to write \"deny\" to " |
2830 | "\"/proc/%d/setgroups\"", pid); | |
2388737b CB |
2831 | return -1; |
2832 | } | |
395b1a3e | 2833 | TRACE("Wrote \"deny\" to \"/proc/%d/setgroups\"", pid); |
a19b974f | 2834 | } |
a19b974f CB |
2835 | } |
2836 | ||
6b5a54cd | 2837 | ret = snprintf(path, PATH_MAX, "/proc/%d/%cid_map", pid, |
29053180 | 2838 | idtype == ID_TYPE_UID ? 'u' : 'g'); |
6b5a54cd | 2839 | if (ret < 0 || ret >= PATH_MAX) |
f6d3e3e4 | 2840 | return -E2BIG; |
29053180 CB |
2841 | |
2842 | fd = open(path, O_WRONLY); | |
2843 | if (fd < 0) { | |
a19b974f | 2844 | SYSERROR("Failed to open \"%s\"", path); |
29053180 | 2845 | return -1; |
f6d3e3e4 | 2846 | } |
29053180 CB |
2847 | |
2848 | errno = 0; | |
2849 | ret = lxc_write_nointr(fd, buf, buf_size); | |
395b1a3e | 2850 | close(fd); |
29053180 | 2851 | if (ret != buf_size) { |
a19b974f | 2852 | SYSERROR("Failed to write %cid mapping to \"%s\"", |
29053180 | 2853 | idtype == ID_TYPE_UID ? 'u' : 'g', path); |
29053180 CB |
2854 | return -1; |
2855 | } | |
29053180 CB |
2856 | |
2857 | return 0; | |
f6d3e3e4 SH |
2858 | } |
2859 | ||
6e50e704 CB |
2860 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
2861 | * | |
2862 | * @return 1 if functional binary was found | |
2863 | * @return 0 if binary exists but is lacking privilege | |
2864 | * @return -ENOENT if binary does not exist | |
2865 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
6e50e704 | 2866 | */ |
df6a2945 CB |
2867 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
2868 | { | |
2869 | char *path; | |
2870 | int ret; | |
2871 | struct stat st; | |
2872 | int fret = 0; | |
2873 | ||
6e50e704 CB |
2874 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
2875 | return -EINVAL; | |
2876 | ||
df6a2945 CB |
2877 | path = on_path(binary, NULL); |
2878 | if (!path) | |
2879 | return -ENOENT; | |
2880 | ||
2881 | ret = stat(path, &st); | |
2882 | if (ret < 0) { | |
2883 | fret = -errno; | |
2884 | goto cleanup; | |
2885 | } | |
2886 | ||
2887 | /* Check if the binary is setuid. */ | |
2888 | if (st.st_mode & S_ISUID) { | |
0fd73091 | 2889 | DEBUG("The binary \"%s\" does have the setuid bit set", path); |
df6a2945 CB |
2890 | fret = 1; |
2891 | goto cleanup; | |
2892 | } | |
2893 | ||
0fd73091 | 2894 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
2895 | /* Check if it has the CAP_SETUID capability. */ |
2896 | if ((cap & CAP_SETUID) && | |
2897 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
2898 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) { | |
2899 | DEBUG("The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE " | |
0fd73091 | 2900 | "and CAP_PERMITTED sets", path); |
df6a2945 CB |
2901 | fret = 1; |
2902 | goto cleanup; | |
2903 | } | |
2904 | ||
2905 | /* Check if it has the CAP_SETGID capability. */ | |
2906 | if ((cap & CAP_SETGID) && | |
2907 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
2908 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) { | |
2909 | DEBUG("The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE " | |
0fd73091 | 2910 | "and CAP_PERMITTED sets", path); |
df6a2945 CB |
2911 | fret = 1; |
2912 | goto cleanup; | |
2913 | } | |
0fd73091 | 2914 | #else |
69924fff CB |
2915 | /* If we cannot check for file capabilities we need to give the benefit |
2916 | * of the doubt. Otherwise we might fail even though all the necessary | |
2917 | * file capabilities are set. | |
2918 | */ | |
ffc40301 | 2919 | DEBUG("Cannot check for file capabilities as full capability support is " |
0fd73091 | 2920 | "missing. Manual intervention needed"); |
d6018f88 | 2921 | fret = 1; |
0fd73091 | 2922 | #endif |
df6a2945 CB |
2923 | |
2924 | cleanup: | |
2925 | free(path); | |
2926 | return fret; | |
2927 | } | |
2928 | ||
986ef930 CB |
2929 | int lxc_map_ids_exec_wrapper(void *args) |
2930 | { | |
2931 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
2932 | return -1; | |
2933 | } | |
2934 | ||
f6d3e3e4 SH |
2935 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) |
2936 | { | |
0fd73091 | 2937 | int fill, left; |
986ef930 | 2938 | char u_or_g; |
4bc3b759 | 2939 | char *pos; |
6b5a54cd | 2940 | char cmd_output[PATH_MAX]; |
0fd73091 CB |
2941 | struct id_map *map; |
2942 | struct lxc_list *iterator; | |
2943 | enum idtype type; | |
986ef930 CB |
2944 | /* strlen("new@idmap") = 9 |
2945 | * + | |
2946 | * strlen(" ") = 1 | |
2947 | * + | |
d33968ad | 2948 | * INTTYPE_TO_STRLEN(uint32_t) |
986ef930 CB |
2949 | * + |
2950 | * strlen(" ") = 1 | |
2951 | * | |
2952 | * We add some additional space to make sure that we really have | |
2953 | * LXC_IDMAPLEN bytes available for our the {g,u]id mapping. | |
2954 | */ | |
0fd73091 | 2955 | int ret = 0, gidmap = 0, uidmap = 0; |
d33968ad | 2956 | char mapbuf[9 + 1 + INTTYPE_TO_STRLEN(uint32_t) + 1 + LXC_IDMAPLEN] = {0}; |
0fd73091 | 2957 | bool had_entry = false, use_shadow = false; |
c724025c JC |
2958 | int hostuid, hostgid; |
2959 | ||
2960 | hostuid = geteuid(); | |
2961 | hostgid = getegid(); | |
df6a2945 CB |
2962 | |
2963 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid | |
2964 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
2965 | * will protected it by preventing another user from being handed the |
2966 | * range by shadow. | |
2967 | */ | |
df6a2945 | 2968 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
2969 | if (uidmap == -ENOENT) |
2970 | WARN("newuidmap binary is missing"); | |
2971 | else if (!uidmap) | |
2972 | WARN("newuidmap is lacking necessary privileges"); | |
2973 | ||
df6a2945 | 2974 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
2975 | if (gidmap == -ENOENT) |
2976 | WARN("newgidmap binary is missing"); | |
2977 | else if (!gidmap) | |
2978 | WARN("newgidmap is lacking necessary privileges"); | |
2979 | ||
df6a2945 | 2980 | if (uidmap > 0 && gidmap > 0) { |
0fd73091 | 2981 | DEBUG("Functional newuidmap and newgidmap binary found"); |
4bc3b759 | 2982 | use_shadow = true; |
df6a2945 | 2983 | } else { |
99d43365 CB |
2984 | /* In case unprivileged users run application containers via |
2985 | * execute() or a start*() there are valid cases where they may | |
2986 | * only want to map their own {g,u}id. Let's not block them from | |
2987 | * doing so by requiring geteuid() == 0. | |
2988 | */ | |
2989 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
c724025c JC |
2990 | "write directly with euid %d", hostuid); |
2991 | } | |
2992 | ||
2993 | /* Check if we really need to use newuidmap and newgidmap. | |
2994 | * If the user is only remapping his own {g,u}id, we don't need it. | |
2995 | */ | |
2996 | if (use_shadow && lxc_list_len(idmap) == 2) { | |
2997 | use_shadow = false; | |
2998 | lxc_list_for_each(iterator, idmap) { | |
2999 | map = iterator->elem; | |
3000 | if (map->idtype == ID_TYPE_UID && map->range == 1 && | |
3001 | map->nsid == hostuid && map->hostid == hostuid) | |
3002 | continue; | |
3003 | if (map->idtype == ID_TYPE_GID && map->range == 1 && | |
3004 | map->nsid == hostgid && map->hostid == hostgid) | |
3005 | continue; | |
3006 | use_shadow = true; | |
3007 | break; | |
3008 | } | |
0e6e3a41 | 3009 | } |
251d0d2a | 3010 | |
986ef930 CB |
3011 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
3012 | type++, u_or_g = 'g') { | |
3013 | pos = mapbuf; | |
3014 | ||
0e6e3a41 | 3015 | if (use_shadow) |
986ef930 | 3016 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 3017 | |
cf3ef16d | 3018 | lxc_list_for_each(iterator, idmap) { |
251d0d2a | 3019 | map = iterator->elem; |
cf3ef16d SH |
3020 | if (map->idtype != type) |
3021 | continue; | |
3022 | ||
4bc3b759 CB |
3023 | had_entry = true; |
3024 | ||
986ef930 | 3025 | left = LXC_IDMAPLEN - (pos - mapbuf); |
d1838f34 | 3026 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
3027 | use_shadow ? " " : "", map->nsid, |
3028 | map->hostid, map->range, | |
0e6e3a41 | 3029 | use_shadow ? "" : "\n"); |
a427e268 CB |
3030 | if (fill <= 0 || fill >= left) { |
3031 | /* The kernel only takes <= 4k for writes to | |
3032 | * /proc/<pid>/{g,u}id_map | |
3033 | */ | |
3034 | SYSERROR("Too many %cid mappings defined", u_or_g); | |
3035 | return -1; | |
3036 | } | |
4bc3b759 | 3037 | |
cf3ef16d | 3038 | pos += fill; |
251d0d2a | 3039 | } |
cf3ef16d | 3040 | if (!had_entry) |
4f7521b4 | 3041 | continue; |
cf3ef16d | 3042 | |
d85813cd | 3043 | /* Try to catch the output of new{g,u}idmap to make debugging |
986ef930 CB |
3044 | * easier. |
3045 | */ | |
3046 | if (use_shadow) { | |
3047 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3048 | lxc_map_ids_exec_wrapper, | |
3049 | (void *)mapbuf); | |
3050 | if (ret < 0) { | |
54fbbeb5 CB |
3051 | ERROR("new%cidmap failed to write mapping \"%s\": %s", |
3052 | u_or_g, cmd_output, mapbuf); | |
986ef930 CB |
3053 | return -1; |
3054 | } | |
54fbbeb5 | 3055 | TRACE("new%cidmap wrote mapping \"%s\"", u_or_g, mapbuf); |
d1838f34 | 3056 | } else { |
986ef930 | 3057 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
54fbbeb5 | 3058 | if (ret < 0) { |
da0f9977 | 3059 | ERROR("Failed to write mapping: %s", mapbuf); |
986ef930 | 3060 | return -1; |
54fbbeb5 CB |
3061 | } |
3062 | TRACE("Wrote mapping \"%s\"", mapbuf); | |
d1838f34 | 3063 | } |
986ef930 CB |
3064 | |
3065 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 3066 | } |
251d0d2a | 3067 | |
986ef930 | 3068 | return 0; |
f6d3e3e4 SH |
3069 | } |
3070 | ||
0fd73091 | 3071 | /* Return the host uid/gid to which the container root is mapped in val. |
0b3a6504 | 3072 | * Return true if id was found, false otherwise. |
cf3ef16d | 3073 | */ |
2a9a80cb | 3074 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
4160c3a0 | 3075 | unsigned long *val) |
cf3ef16d | 3076 | { |
4160c3a0 | 3077 | unsigned nsid; |
0fd73091 CB |
3078 | struct id_map *map; |
3079 | struct lxc_list *it; | |
4160c3a0 CB |
3080 | |
3081 | if (idtype == ID_TYPE_UID) | |
3082 | nsid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; | |
3083 | else | |
3084 | nsid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
cf3ef16d | 3085 | |
0fd73091 | 3086 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 3087 | map = it->elem; |
7b50c609 | 3088 | if (map->idtype != idtype) |
cf3ef16d | 3089 | continue; |
4160c3a0 | 3090 | if (map->nsid != nsid) |
cf3ef16d | 3091 | continue; |
2a9a80cb SH |
3092 | *val = map->hostid; |
3093 | return true; | |
cf3ef16d | 3094 | } |
4160c3a0 | 3095 | |
2a9a80cb | 3096 | return false; |
cf3ef16d SH |
3097 | } |
3098 | ||
2133f58c | 3099 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3100 | { |
cf3ef16d | 3101 | struct id_map *map; |
0fd73091 CB |
3102 | struct lxc_list *it; |
3103 | ||
3104 | lxc_list_for_each (it, &conf->id_map) { | |
cf3ef16d | 3105 | map = it->elem; |
2133f58c | 3106 | if (map->idtype != idtype) |
cf3ef16d | 3107 | continue; |
0fd73091 | 3108 | |
cf3ef16d | 3109 | if (id >= map->hostid && id < map->hostid + map->range) |
57d116ab | 3110 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 3111 | } |
0fd73091 | 3112 | |
57d116ab | 3113 | return -1; |
cf3ef16d SH |
3114 | } |
3115 | ||
339efad9 | 3116 | int find_unmapped_nsid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3117 | { |
cf3ef16d | 3118 | struct id_map *map; |
0fd73091 | 3119 | struct lxc_list *it; |
2133f58c | 3120 | unsigned int freeid = 0; |
0fd73091 | 3121 | |
cf3ef16d | 3122 | again: |
0fd73091 | 3123 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 3124 | map = it->elem; |
2133f58c | 3125 | if (map->idtype != idtype) |
cf3ef16d | 3126 | continue; |
0fd73091 | 3127 | |
cf3ef16d SH |
3128 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { |
3129 | freeid = map->nsid + map->range; | |
3130 | goto again; | |
3131 | } | |
3132 | } | |
0fd73091 | 3133 | |
cf3ef16d SH |
3134 | return freeid; |
3135 | } | |
3136 | ||
f4f52cb5 CB |
3137 | int chown_mapped_root_exec_wrapper(void *args) |
3138 | { | |
3139 | execvp("lxc-usernsexec", args); | |
3140 | return -1; | |
3141 | } | |
3142 | ||
0fd73091 | 3143 | /* chown_mapped_root: for an unprivileged user with uid/gid X to |
7b50c609 TS |
3144 | * chown a dir to subuid/subgid Y, he needs to run chown as root |
3145 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
3146 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
3147 | * root is privileged with respect to hostuid/hostgid X, allowing | |
3148 | * him to do the chown. | |
f6d3e3e4 | 3149 | */ |
41dc7155 | 3150 | int chown_mapped_root(const char *path, struct lxc_conf *conf) |
f6d3e3e4 | 3151 | { |
f4f52cb5 | 3152 | uid_t rootuid, rootgid; |
2a9a80cb | 3153 | unsigned long val; |
f4f52cb5 CB |
3154 | int hostuid, hostgid, ret; |
3155 | struct stat sb; | |
3156 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
3157 | char ugid[100]; | |
41dc7155 | 3158 | const char *args1[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3159 | "-m", map1, |
3160 | "-m", map2, | |
3161 | "-m", map3, | |
3162 | "-m", map5, | |
3163 | "--", "chown", ugid, path, | |
3164 | NULL}; | |
41dc7155 | 3165 | const char *args2[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3166 | "-m", map1, |
3167 | "-m", map2, | |
3168 | "-m", map3, | |
3169 | "-m", map4, | |
3170 | "-m", map5, | |
3171 | "--", "chown", ugid, path, | |
3172 | NULL}; | |
6b5a54cd | 3173 | char cmd_output[PATH_MAX]; |
f4f52cb5 CB |
3174 | |
3175 | hostuid = geteuid(); | |
3176 | hostgid = getegid(); | |
f6d3e3e4 | 3177 | |
2a9a80cb | 3178 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
bc80f098 | 3179 | ERROR("No uid mapping for container root"); |
c4d10a05 | 3180 | return -1; |
f6d3e3e4 | 3181 | } |
f4f52cb5 | 3182 | rootuid = (uid_t)val; |
0fd73091 | 3183 | |
7b50c609 | 3184 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { |
bc80f098 | 3185 | ERROR("No gid mapping for container root"); |
7b50c609 TS |
3186 | return -1; |
3187 | } | |
f4f52cb5 | 3188 | rootgid = (gid_t)val; |
2a9a80cb | 3189 | |
f4f52cb5 | 3190 | if (hostuid == 0) { |
7b50c609 | 3191 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3192 | ERROR("Error chowning %s", path); |
3193 | return -1; | |
3194 | } | |
0fd73091 | 3195 | |
c4d10a05 SH |
3196 | return 0; |
3197 | } | |
f3d7e4ca | 3198 | |
f4f52cb5 | 3199 | if (rootuid == hostuid) { |
1a0e70ac | 3200 | /* nothing to do */ |
b103ceac | 3201 | INFO("Container root is our uid; no need to chown"); |
f3d7e4ca SH |
3202 | return 0; |
3203 | } | |
3204 | ||
bbdbf8f0 | 3205 | /* save the current gid of "path" */ |
f4f52cb5 CB |
3206 | if (stat(path, &sb) < 0) { |
3207 | ERROR("Error stat %s", path); | |
f6d3e3e4 SH |
3208 | return -1; |
3209 | } | |
7b50c609 | 3210 | |
bbdbf8f0 CB |
3211 | /* Update the path argument in case this was overlayfs. */ |
3212 | args1[sizeof(args1) / sizeof(args1[0]) - 2] = path; | |
3213 | args2[sizeof(args2) / sizeof(args2[0]) - 2] = path; | |
3214 | ||
f4f52cb5 CB |
3215 | /* |
3216 | * A file has to be group-owned by a gid mapped into the | |
3217 | * container, or the container won't be privileged over it. | |
3218 | */ | |
3219 | DEBUG("trying to chown \"%s\" to %d", path, hostgid); | |
3220 | if (sb.st_uid == hostuid && | |
3221 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3222 | chown(path, -1, hostgid) < 0) { | |
3223 | ERROR("Failed chgrping %s", path); | |
3224 | return -1; | |
3225 | } | |
f6d3e3e4 | 3226 | |
1a0e70ac | 3227 | /* "u:0:rootuid:1" */ |
f4f52cb5 CB |
3228 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); |
3229 | if (ret < 0 || ret >= 100) { | |
3230 | ERROR("Error uid printing map string"); | |
3231 | return -1; | |
3232 | } | |
7b50c609 | 3233 | |
1a0e70ac | 3234 | /* "u:hostuid:hostuid:1" */ |
f4f52cb5 CB |
3235 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); |
3236 | if (ret < 0 || ret >= 100) { | |
3237 | ERROR("Error uid printing map string"); | |
3238 | return -1; | |
3239 | } | |
c4d10a05 | 3240 | |
1a0e70ac | 3241 | /* "g:0:rootgid:1" */ |
f4f52cb5 CB |
3242 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); |
3243 | if (ret < 0 || ret >= 100) { | |
3244 | ERROR("Error gid printing map string"); | |
3245 | return -1; | |
3246 | } | |
98e5ba51 | 3247 | |
1a0e70ac | 3248 | /* "g:pathgid:rootgid+pathgid:1" */ |
f4f52cb5 CB |
3249 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, |
3250 | rootgid + (gid_t)sb.st_gid); | |
3251 | if (ret < 0 || ret >= 100) { | |
3252 | ERROR("Error gid printing map string"); | |
3253 | return -1; | |
3254 | } | |
c4d10a05 | 3255 | |
1a0e70ac | 3256 | /* "g:hostgid:hostgid:1" */ |
f4f52cb5 CB |
3257 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); |
3258 | if (ret < 0 || ret >= 100) { | |
3259 | ERROR("Error gid printing map string"); | |
3260 | return -1; | |
3261 | } | |
7b50c609 | 3262 | |
1a0e70ac | 3263 | /* "0:pathgid" (chown) */ |
f4f52cb5 CB |
3264 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); |
3265 | if (ret < 0 || ret >= 100) { | |
3266 | ERROR("Error owner printing format string for chown"); | |
3267 | return -1; | |
3268 | } | |
7b50c609 | 3269 | |
f4f52cb5 CB |
3270 | if (hostgid == sb.st_gid) |
3271 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3272 | chown_mapped_root_exec_wrapper, | |
3273 | (void *)args1); | |
3274 | else | |
3275 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3276 | chown_mapped_root_exec_wrapper, | |
3277 | (void *)args2); | |
3278 | if (ret < 0) | |
3279 | ERROR("lxc-usernsexec failed: %s", cmd_output); | |
7b50c609 | 3280 | |
f4f52cb5 | 3281 | return ret; |
f6d3e3e4 SH |
3282 | } |
3283 | ||
943144d9 CB |
3284 | /* NOTE: Must not be called from inside the container namespace! */ |
3285 | int lxc_create_tmp_proc_mount(struct lxc_conf *conf) | |
5112cd70 SH |
3286 | { |
3287 | int mounted; | |
3288 | ||
943144d9 | 3289 | mounted = lxc_mount_proc_if_needed(conf->rootfs.path ? conf->rootfs.mount : ""); |
5112cd70 | 3290 | if (mounted == -1) { |
0fd73091 | 3291 | SYSERROR("Failed to mount proc in the container"); |
01958b1f | 3292 | /* continue only if there is no rootfs */ |
943144d9 | 3293 | if (conf->rootfs.path) |
01958b1f | 3294 | return -1; |
5112cd70 | 3295 | } else if (mounted == 1) { |
7a0bcca3 | 3296 | conf->tmp_umount_proc = true; |
5112cd70 | 3297 | } |
943144d9 | 3298 | |
5112cd70 SH |
3299 | return 0; |
3300 | } | |
3301 | ||
3302 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3303 | { | |
7a0bcca3 | 3304 | if (!lxc_conf->tmp_umount_proc) |
0fd73091 CB |
3305 | return; |
3306 | ||
7a0bcca3 CB |
3307 | (void)umount2("/proc", MNT_DETACH); |
3308 | lxc_conf->tmp_umount_proc = false; | |
5112cd70 SH |
3309 | } |
3310 | ||
0fd73091 | 3311 | /* Walk /proc/mounts and change any shared entries to slave. */ |
6a0c909a | 3312 | void remount_all_slave(void) |
e995d7a2 | 3313 | { |
6a49f05e CB |
3314 | int memfd, mntinfo_fd, ret; |
3315 | ssize_t copied; | |
0fd73091 | 3316 | FILE *f; |
e995d7a2 | 3317 | size_t len = 0; |
0fd73091 | 3318 | char *line = NULL; |
e995d7a2 | 3319 | |
6a49f05e | 3320 | mntinfo_fd = open("/proc/self/mountinfo", O_RDONLY | O_CLOEXEC); |
fea3b91d DJ |
3321 | if (mntinfo_fd < 0) { |
3322 | SYSERROR("Failed to open \"/proc/self/mountinfo\""); | |
6a49f05e | 3323 | return; |
fea3b91d | 3324 | } |
6a49f05e CB |
3325 | |
3326 | memfd = memfd_create(".lxc_mountinfo", MFD_CLOEXEC); | |
3327 | if (memfd < 0) { | |
3328 | char template[] = P_tmpdir "/.lxc_mountinfo_XXXXXX"; | |
3329 | ||
3330 | if (errno != ENOSYS) { | |
fea3b91d | 3331 | SYSERROR("Failed to create temporary in-memory file"); |
6a49f05e | 3332 | close(mntinfo_fd); |
6a49f05e CB |
3333 | return; |
3334 | } | |
3335 | ||
3336 | memfd = lxc_make_tmpfile(template, true); | |
fea3b91d DJ |
3337 | if (memfd < 0) { |
3338 | close(mntinfo_fd); | |
3339 | WARN("Failed to create temporary file"); | |
3340 | return; | |
3341 | } | |
6a49f05e CB |
3342 | } |
3343 | ||
6a49f05e | 3344 | again: |
7c4d9466 | 3345 | copied = lxc_sendfile_nointr(memfd, mntinfo_fd, NULL, LXC_SENDFILE_MAX); |
6a49f05e CB |
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 | { | |
6b5a54cd | 3508 | char path[PATH_MAX]; |
0fd73091 CB |
3509 | struct lxc_list *it; |
3510 | ||
3511 | lxc_list_for_each (it, &conf->hooks[LXCHOOK_START]) { | |
1c1c7051 | 3512 | int ret; |
0fd73091 | 3513 | char *hookname = it->elem; |
1c1c7051 | 3514 | |
6b5a54cd | 3515 | ret = snprintf(path, PATH_MAX, "%s%s", |
0fd73091 CB |
3516 | conf->rootfs.path ? conf->rootfs.mount : "", |
3517 | hookname); | |
6b5a54cd | 3518 | if (ret < 0 || ret >= PATH_MAX) |
1c1c7051 | 3519 | return false; |
0fd73091 | 3520 | |
75193660 | 3521 | ret = access(path, X_OK); |
0fd73091 | 3522 | if (ret < 0) { |
75193660 | 3523 | SYSERROR("Start hook \"%s\" not found in container", |
0fd73091 | 3524 | hookname); |
1c1c7051 SH |
3525 | return false; |
3526 | } | |
0fd73091 | 3527 | |
6a0c909a | 3528 | return true; |
1c1c7051 SH |
3529 | } |
3530 | ||
3531 | return true; | |
3532 | } | |
3533 | ||
4b5b3a2a TA |
3534 | static bool execveat_supported(void) |
3535 | { | |
13be2733 | 3536 | lxc_raw_execveat(-1, "", NULL, NULL, AT_EMPTY_PATH); |
4b5b3a2a TA |
3537 | if (errno == ENOSYS) |
3538 | return false; | |
3539 | ||
3540 | return true; | |
4b5b3a2a TA |
3541 | } |
3542 | ||
3b988b33 | 3543 | int lxc_setup(struct lxc_handler *handler) |
35120d9c | 3544 | { |
2187efd3 | 3545 | int ret; |
0fd73091 | 3546 | const char *lxcpath = handler->lxcpath, *name = handler->name; |
35120d9c | 3547 | struct lxc_conf *lxc_conf = handler->conf; |
35120d9c | 3548 | |
8ce1abc2 | 3549 | ret = lxc_setup_rootfs_prepare_root(lxc_conf, name, lxcpath); |
8353b4c9 CB |
3550 | if (ret < 0) { |
3551 | ERROR("Failed to setup rootfs"); | |
35120d9c SH |
3552 | return -1; |
3553 | } | |
3554 | ||
28d9e29e | 3555 | if (handler->nsfd[LXC_NS_UTS] == -1) { |
8353b4c9 CB |
3556 | ret = setup_utsname(lxc_conf->utsname); |
3557 | if (ret < 0) { | |
0fd73091 | 3558 | ERROR("Failed to setup the utsname %s", name); |
6c544cb3 MM |
3559 | return -1; |
3560 | } | |
0ad19a3f | 3561 | } |
3562 | ||
b25291da CB |
3563 | ret = lxc_setup_keyring(); |
3564 | if (ret < 0) | |
3565 | return -1; | |
3566 | ||
8353b4c9 CB |
3567 | ret = lxc_setup_network_in_child_namespaces(lxc_conf, &lxc_conf->network); |
3568 | if (ret < 0) { | |
3569 | ERROR("Failed to setup network"); | |
95b5ffaf | 3570 | return -1; |
0ad19a3f | 3571 | } |
3572 | ||
8353b4c9 CB |
3573 | ret = lxc_network_send_name_and_ifindex_to_parent(handler); |
3574 | if (ret < 0) { | |
3575 | ERROR("Failed to send network device names and ifindices to parent"); | |
790255cf CB |
3576 | return -1; |
3577 | } | |
3578 | ||
bc6928ff | 3579 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3580 | ret = mount_autodev(name, &lxc_conf->rootfs, lxcpath); |
3581 | if (ret < 0) { | |
3582 | ERROR("Failed to mount \"/dev\""); | |
c6883f38 SH |
3583 | return -1; |
3584 | } | |
3585 | } | |
3586 | ||
8353b4c9 CB |
3587 | /* Do automatic mounts (mainly /proc and /sys), but exclude those that |
3588 | * need to wait until other stuff has finished. | |
368bbc02 | 3589 | */ |
8353b4c9 CB |
3590 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler); |
3591 | if (ret < 0) { | |
3592 | ERROR("Failed to setup first automatic mounts"); | |
368bbc02 CS |
3593 | return -1; |
3594 | } | |
3595 | ||
8353b4c9 CB |
3596 | ret = setup_mount(lxc_conf, &lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath); |
3597 | if (ret < 0) { | |
3598 | ERROR("Failed to setup mounts"); | |
95b5ffaf | 3599 | return -1; |
576f946d | 3600 | } |
3601 | ||
8353b4c9 | 3602 | if (lxc_conf->is_execute) { |
4b5b3a2a TA |
3603 | if (execveat_supported()) { |
3604 | int fd; | |
3605 | char path[PATH_MAX]; | |
3606 | ||
3607 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
3608 | if (ret < 0 || ret >= PATH_MAX) { | |
3609 | ERROR("Path to init.lxc.static too long"); | |
3610 | return -1; | |
3611 | } | |
3612 | ||
3613 | fd = open(path, O_PATH | O_CLOEXEC); | |
3614 | if (fd < 0) { | |
3615 | SYSERROR("Unable to open lxc.init.static"); | |
3616 | return -1; | |
3617 | } | |
3618 | ||
3619 | ((struct execute_args *)handler->data)->init_fd = fd; | |
3620 | ((struct execute_args *)handler->data)->init_path = NULL; | |
3621 | } else { | |
3622 | ret = lxc_execute_bind_init(handler); | |
3623 | if (ret < 0) { | |
3624 | ERROR("Failed to bind-mount the lxc init system"); | |
3625 | return -1; | |
3626 | } | |
8353b4c9 CB |
3627 | } |
3628 | } | |
2322903b | 3629 | |
8353b4c9 CB |
3630 | /* Now mount only cgroups, if wanted. Before, /sys could not have been |
3631 | * mounted. It is guaranteed to be mounted now either through | |
3632 | * automatically or via fstab entries. | |
368bbc02 | 3633 | */ |
8353b4c9 CB |
3634 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler); |
3635 | if (ret < 0) { | |
3636 | ERROR("Failed to setup remaining automatic mounts"); | |
368bbc02 CS |
3637 | return -1; |
3638 | } | |
3639 | ||
8353b4c9 | 3640 | ret = run_lxc_hooks(name, "mount", lxc_conf, NULL); |
1a2cf89d | 3641 | if (ret < 0) { |
8353b4c9 | 3642 | ERROR("Failed to run mount hooks"); |
773fb9ca SH |
3643 | return -1; |
3644 | } | |
3645 | ||
bc6928ff | 3646 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3647 | ret = run_lxc_hooks(name, "autodev", lxc_conf, NULL); |
3648 | if (ret < 0) { | |
3649 | ERROR("Failed to run autodev hooks"); | |
f7bee6c6 MW |
3650 | return -1; |
3651 | } | |
06749971 | 3652 | |
8353b4c9 CB |
3653 | ret = lxc_fill_autodev(&lxc_conf->rootfs); |
3654 | if (ret < 0) { | |
3655 | ERROR("Failed to populate \"/dev\""); | |
91c3830e SH |
3656 | return -1; |
3657 | } | |
3658 | } | |
368bbc02 | 3659 | |
8353b4c9 CB |
3660 | if (!lxc_list_empty(&lxc_conf->mount_list)) { |
3661 | ret = setup_mount_entries(lxc_conf, &lxc_conf->rootfs, | |
3662 | &lxc_conf->mount_list, name, lxcpath); | |
3663 | if (ret < 0) { | |
3664 | ERROR("Failed to setup mount entries"); | |
3665 | return -1; | |
3666 | } | |
181437fd YT |
3667 | } |
3668 | ||
75193660 CB |
3669 | /* Make sure any start hooks are in the container */ |
3670 | if (!verify_start_hooks(lxc_conf)) { | |
3671 | ERROR("Failed to verify start hooks"); | |
3672 | return -1; | |
3673 | } | |
3674 | ||
ed8704d0 | 3675 | ret = lxc_setup_console(&lxc_conf->rootfs, &lxc_conf->console, |
885766f5 | 3676 | lxc_conf->ttys.dir); |
ed8704d0 CB |
3677 | if (ret < 0) { |
3678 | ERROR("Failed to setup console"); | |
95b5ffaf | 3679 | return -1; |
6e590161 | 3680 | } |
3681 | ||
ed8704d0 CB |
3682 | ret = lxc_setup_dev_symlinks(&lxc_conf->rootfs); |
3683 | if (ret < 0) { | |
8353b4c9 | 3684 | ERROR("Failed to setup \"/dev\" symlinks"); |
69aa6655 DE |
3685 | return -1; |
3686 | } | |
3687 | ||
8353b4c9 CB |
3688 | ret = lxc_create_tmp_proc_mount(lxc_conf); |
3689 | if (ret < 0) { | |
3690 | ERROR("Failed to \"/proc\" LSMs"); | |
e075f5d9 | 3691 | return -1; |
e075f5d9 | 3692 | } |
e075f5d9 | 3693 | |
8ce1abc2 | 3694 | ret = lxc_setup_rootfs_switch_root(&lxc_conf->rootfs); |
8353b4c9 CB |
3695 | if (ret < 0) { |
3696 | ERROR("Failed to pivot root into rootfs"); | |
95b5ffaf | 3697 | return -1; |
ed502555 | 3698 | } |
3699 | ||
8353b4c9 CB |
3700 | ret = lxc_setup_devpts(lxc_conf); |
3701 | if (ret < 0) { | |
3702 | ERROR("Failed to setup new devpts instance"); | |
95b5ffaf | 3703 | return -1; |
3c26f34e | 3704 | } |
3705 | ||
2187efd3 CB |
3706 | ret = lxc_create_ttys(handler); |
3707 | if (ret < 0) | |
e8bd4e43 | 3708 | return -1; |
e8bd4e43 | 3709 | |
8353b4c9 CB |
3710 | ret = setup_personality(lxc_conf->personality); |
3711 | if (ret < 0) { | |
3712 | ERROR("Failed to set personality"); | |
cccc74b5 DL |
3713 | return -1; |
3714 | } | |
3715 | ||
8353b4c9 CB |
3716 | /* Set sysctl value to a path under /proc/sys as determined from the |
3717 | * key. For e.g. net.ipv4.ip_forward translated to | |
3718 | * /proc/sys/net/ipv4/ip_forward. | |
7edd0540 L |
3719 | */ |
3720 | if (!lxc_list_empty(&lxc_conf->sysctls)) { | |
3721 | ret = setup_sysctl_parameters(&lxc_conf->sysctls); | |
8353b4c9 CB |
3722 | if (ret < 0) { |
3723 | ERROR("Failed to setup sysctl parameters"); | |
7edd0540 | 3724 | return -1; |
8353b4c9 | 3725 | } |
7edd0540 L |
3726 | } |
3727 | ||
97a8f74f SG |
3728 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
3729 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
8353b4c9 CB |
3730 | ERROR("Container requests lxc.cap.drop and " |
3731 | "lxc.cap.keep: either use lxc.cap.drop or " | |
3732 | "lxc.cap.keep, not both"); | |
f6d3e3e4 SH |
3733 | return -1; |
3734 | } | |
8353b4c9 | 3735 | |
97a8f74f | 3736 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
8353b4c9 | 3737 | ERROR("Failed to keep capabilities"); |
97a8f74f SG |
3738 | return -1; |
3739 | } | |
3740 | } else if (setup_caps(&lxc_conf->caps)) { | |
8353b4c9 | 3741 | ERROR("Failed to drop capabilities"); |
97a8f74f | 3742 | return -1; |
81810dd1 DL |
3743 | } |
3744 | ||
8353b4c9 | 3745 | NOTICE("The container \"%s\" is set up", name); |
cd54d859 | 3746 | |
0ad19a3f | 3747 | return 0; |
3748 | } | |
26ddeedd | 3749 | |
3f60c2f7 | 3750 | int run_lxc_hooks(const char *name, char *hookname, struct lxc_conf *conf, |
14a7b0f9 | 3751 | char *argv[]) |
26ddeedd | 3752 | { |
26ddeedd | 3753 | struct lxc_list *it; |
3f60c2f7 | 3754 | int which = -1; |
26ddeedd | 3755 | |
3f60c2f7 | 3756 | if (strcmp(hookname, "pre-start") == 0) |
26ddeedd | 3757 | which = LXCHOOK_PRESTART; |
3f60c2f7 | 3758 | else if (strcmp(hookname, "start-host") == 0) |
08dd2805 | 3759 | which = LXCHOOK_START_HOST; |
3f60c2f7 | 3760 | else if (strcmp(hookname, "pre-mount") == 0) |
5ea6163a | 3761 | which = LXCHOOK_PREMOUNT; |
3f60c2f7 | 3762 | else if (strcmp(hookname, "mount") == 0) |
26ddeedd | 3763 | which = LXCHOOK_MOUNT; |
3f60c2f7 | 3764 | else if (strcmp(hookname, "autodev") == 0) |
f7bee6c6 | 3765 | which = LXCHOOK_AUTODEV; |
3f60c2f7 | 3766 | else if (strcmp(hookname, "start") == 0) |
26ddeedd | 3767 | which = LXCHOOK_START; |
3f60c2f7 | 3768 | else if (strcmp(hookname, "stop") == 0) |
52492063 | 3769 | which = LXCHOOK_STOP; |
3f60c2f7 | 3770 | else if (strcmp(hookname, "post-stop") == 0) |
26ddeedd | 3771 | which = LXCHOOK_POSTSTOP; |
3f60c2f7 | 3772 | else if (strcmp(hookname, "clone") == 0) |
148e91f5 | 3773 | which = LXCHOOK_CLONE; |
3f60c2f7 | 3774 | else if (strcmp(hookname, "destroy") == 0) |
37cf711b | 3775 | which = LXCHOOK_DESTROY; |
26ddeedd SH |
3776 | else |
3777 | return -1; | |
3f60c2f7 | 3778 | |
0fd73091 | 3779 | lxc_list_for_each (it, &conf->hooks[which]) { |
26ddeedd | 3780 | int ret; |
3f60c2f7 CB |
3781 | char *hook = it->elem; |
3782 | ||
3783 | ret = run_script_argv(name, conf->hooks_version, "lxc", hook, | |
14a7b0f9 | 3784 | hookname, argv); |
3f60c2f7 CB |
3785 | if (ret < 0) |
3786 | return -1; | |
26ddeedd | 3787 | } |
3f60c2f7 | 3788 | |
26ddeedd SH |
3789 | return 0; |
3790 | } | |
72d0e1cb | 3791 | |
72d0e1cb SG |
3792 | int lxc_clear_config_caps(struct lxc_conf *c) |
3793 | { | |
1a0e70ac | 3794 | struct lxc_list *it, *next; |
72d0e1cb | 3795 | |
0fd73091 | 3796 | lxc_list_for_each_safe (it, &c->caps, next) { |
72d0e1cb SG |
3797 | lxc_list_del(it); |
3798 | free(it->elem); | |
3799 | free(it); | |
3800 | } | |
0fd73091 | 3801 | |
72d0e1cb SG |
3802 | return 0; |
3803 | } | |
3804 | ||
c7e345ae CB |
3805 | static int lxc_free_idmap(struct lxc_list *id_map) |
3806 | { | |
27c27d73 SH |
3807 | struct lxc_list *it, *next; |
3808 | ||
0fd73091 | 3809 | lxc_list_for_each_safe (it, id_map, next) { |
27c27d73 SH |
3810 | lxc_list_del(it); |
3811 | free(it->elem); | |
3812 | free(it); | |
3813 | } | |
c7e345ae | 3814 | |
27c27d73 SH |
3815 | return 0; |
3816 | } | |
3817 | ||
4355ab5f SH |
3818 | int lxc_clear_idmaps(struct lxc_conf *c) |
3819 | { | |
3820 | return lxc_free_idmap(&c->id_map); | |
3821 | } | |
3822 | ||
1fb86a7c SH |
3823 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
3824 | { | |
0fd73091 | 3825 | struct lxc_list *it, *next; |
1fb86a7c | 3826 | |
0fd73091 | 3827 | lxc_list_for_each_safe (it, &c->keepcaps, next) { |
1fb86a7c SH |
3828 | lxc_list_del(it); |
3829 | free(it->elem); | |
3830 | free(it); | |
3831 | } | |
0fd73091 | 3832 | |
1fb86a7c SH |
3833 | return 0; |
3834 | } | |
3835 | ||
54860ed0 | 3836 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version) |
72d0e1cb | 3837 | { |
54860ed0 | 3838 | char *global_token, *namespaced_token; |
ab1a6cac | 3839 | size_t namespaced_token_len; |
54860ed0 | 3840 | struct lxc_list *it, *next, *list; |
ab1a6cac | 3841 | const char *k = key; |
54860ed0 | 3842 | bool all = false; |
72d0e1cb | 3843 | |
54860ed0 CB |
3844 | if (version == CGROUP2_SUPER_MAGIC) { |
3845 | global_token = "lxc.cgroup2"; | |
3846 | namespaced_token = "lxc.cgroup2."; | |
6333c915 | 3847 | namespaced_token_len = STRLITERALLEN("lxc.cgroup2."); |
54860ed0 CB |
3848 | list = &c->cgroup2; |
3849 | } else if (version == CGROUP_SUPER_MAGIC) { | |
3850 | global_token = "lxc.cgroup"; | |
3851 | namespaced_token = "lxc.cgroup."; | |
6333c915 | 3852 | namespaced_token_len = STRLITERALLEN("lxc.cgroup."); |
54860ed0 CB |
3853 | list = &c->cgroup; |
3854 | } else { | |
ab1a6cac | 3855 | return -EINVAL; |
54860ed0 CB |
3856 | } |
3857 | ||
3858 | if (strcmp(key, global_token) == 0) | |
72d0e1cb | 3859 | all = true; |
6333c915 | 3860 | else if (strncmp(key, namespaced_token, namespaced_token_len) == 0) |
ab1a6cac | 3861 | k += namespaced_token_len; |
a6390f01 | 3862 | else |
ab1a6cac | 3863 | return -EINVAL; |
72d0e1cb | 3864 | |
0fd73091 | 3865 | lxc_list_for_each_safe (it, list, next) { |
72d0e1cb | 3866 | struct lxc_cgroup *cg = it->elem; |
54860ed0 | 3867 | |
72d0e1cb SG |
3868 | if (!all && strcmp(cg->subsystem, k) != 0) |
3869 | continue; | |
54860ed0 | 3870 | |
72d0e1cb SG |
3871 | lxc_list_del(it); |
3872 | free(cg->subsystem); | |
3873 | free(cg->value); | |
3874 | free(cg); | |
3875 | free(it); | |
3876 | } | |
e409b214 | 3877 | |
72d0e1cb SG |
3878 | return 0; |
3879 | } | |
3880 | ||
c6d09e15 WB |
3881 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
3882 | { | |
3883 | struct lxc_list *it, *next; | |
c6d09e15 | 3884 | const char *k = NULL; |
0fd73091 | 3885 | bool all = false; |
c6d09e15 | 3886 | |
b668653c | 3887 | if (strcmp(key, "lxc.limit") == 0 || strcmp(key, "lxc.prlimit") == 0) |
c6d09e15 | 3888 | all = true; |
6333c915 CB |
3889 | else if (strncmp(key, "lxc.limit.", STRLITERALLEN("lxc.limit.")) == 0) |
3890 | k = key + STRLITERALLEN("lxc.limit."); | |
3891 | else if (strncmp(key, "lxc.prlimit.", STRLITERALLEN("lxc.prlimit.")) == 0) | |
3892 | k = key + STRLITERALLEN("lxc.prlimit."); | |
c6d09e15 WB |
3893 | else |
3894 | return -1; | |
3895 | ||
0fd73091 | 3896 | lxc_list_for_each_safe (it, &c->limits, next) { |
c6d09e15 | 3897 | struct lxc_limit *lim = it->elem; |
0fd73091 | 3898 | |
c6d09e15 WB |
3899 | if (!all && strcmp(lim->resource, k) != 0) |
3900 | continue; | |
0fd73091 | 3901 | |
c6d09e15 WB |
3902 | lxc_list_del(it); |
3903 | free(lim->resource); | |
3904 | free(lim); | |
3905 | free(it); | |
3906 | } | |
b668653c | 3907 | |
c6d09e15 WB |
3908 | return 0; |
3909 | } | |
3910 | ||
7edd0540 L |
3911 | int lxc_clear_sysctls(struct lxc_conf *c, const char *key) |
3912 | { | |
3913 | struct lxc_list *it, *next; | |
7edd0540 | 3914 | const char *k = NULL; |
0fd73091 | 3915 | bool all = false; |
7edd0540 L |
3916 | |
3917 | if (strcmp(key, "lxc.sysctl") == 0) | |
3918 | all = true; | |
6333c915 CB |
3919 | else if (strncmp(key, "lxc.sysctl.", STRLITERALLEN("lxc.sysctl.")) == 0) |
3920 | k = key + STRLITERALLEN("lxc.sysctl."); | |
7edd0540 L |
3921 | else |
3922 | return -1; | |
3923 | ||
0fd73091 | 3924 | lxc_list_for_each_safe (it, &c->sysctls, next) { |
7edd0540 | 3925 | struct lxc_sysctl *elem = it->elem; |
0fd73091 | 3926 | |
7edd0540 L |
3927 | if (!all && strcmp(elem->key, k) != 0) |
3928 | continue; | |
0fd73091 | 3929 | |
7edd0540 L |
3930 | lxc_list_del(it); |
3931 | free(elem->key); | |
3932 | free(elem->value); | |
3933 | free(elem); | |
3934 | free(it); | |
3935 | } | |
0fd73091 | 3936 | |
7edd0540 L |
3937 | return 0; |
3938 | } | |
3939 | ||
61d7a733 YT |
3940 | int lxc_clear_procs(struct lxc_conf *c, const char *key) |
3941 | { | |
0fd73091 | 3942 | struct lxc_list *it, *next; |
61d7a733 | 3943 | const char *k = NULL; |
0fd73091 | 3944 | bool all = false; |
61d7a733 YT |
3945 | |
3946 | if (strcmp(key, "lxc.proc") == 0) | |
3947 | all = true; | |
6333c915 CB |
3948 | else if (strncmp(key, "lxc.proc.", STRLITERALLEN("lxc.proc.")) == 0) |
3949 | k = key + STRLITERALLEN("lxc.proc."); | |
61d7a733 YT |
3950 | else |
3951 | return -1; | |
3952 | ||
0fd73091 | 3953 | lxc_list_for_each_safe (it, &c->procs, next) { |
61d7a733 | 3954 | struct lxc_proc *proc = it->elem; |
0fd73091 | 3955 | |
61d7a733 YT |
3956 | if (!all && strcmp(proc->filename, k) != 0) |
3957 | continue; | |
0fd73091 | 3958 | |
61d7a733 YT |
3959 | lxc_list_del(it); |
3960 | free(proc->filename); | |
3961 | free(proc->value); | |
3962 | free(proc); | |
3963 | free(it); | |
3964 | } | |
3965 | ||
3966 | return 0; | |
3967 | } | |
3968 | ||
ee1e7aa0 SG |
3969 | int lxc_clear_groups(struct lxc_conf *c) |
3970 | { | |
0fd73091 | 3971 | struct lxc_list *it, *next; |
ee1e7aa0 | 3972 | |
0fd73091 | 3973 | lxc_list_for_each_safe (it, &c->groups, next) { |
ee1e7aa0 SG |
3974 | lxc_list_del(it); |
3975 | free(it->elem); | |
3976 | free(it); | |
3977 | } | |
0fd73091 | 3978 | |
ee1e7aa0 SG |
3979 | return 0; |
3980 | } | |
3981 | ||
ab799c0b SG |
3982 | int lxc_clear_environment(struct lxc_conf *c) |
3983 | { | |
0fd73091 | 3984 | struct lxc_list *it, *next; |
ab799c0b | 3985 | |
0fd73091 | 3986 | lxc_list_for_each_safe (it, &c->environment, next) { |
ab799c0b SG |
3987 | lxc_list_del(it); |
3988 | free(it->elem); | |
3989 | free(it); | |
3990 | } | |
0fd73091 | 3991 | |
ab799c0b SG |
3992 | return 0; |
3993 | } | |
3994 | ||
72d0e1cb SG |
3995 | int lxc_clear_mount_entries(struct lxc_conf *c) |
3996 | { | |
0fd73091 | 3997 | struct lxc_list *it, *next; |
72d0e1cb | 3998 | |
0fd73091 | 3999 | lxc_list_for_each_safe (it, &c->mount_list, next) { |
72d0e1cb SG |
4000 | lxc_list_del(it); |
4001 | free(it->elem); | |
4002 | free(it); | |
4003 | } | |
0fd73091 | 4004 | |
72d0e1cb SG |
4005 | return 0; |
4006 | } | |
4007 | ||
b099e9e9 SH |
4008 | int lxc_clear_automounts(struct lxc_conf *c) |
4009 | { | |
4010 | c->auto_mounts = 0; | |
4011 | return 0; | |
4012 | } | |
4013 | ||
12a50cc6 | 4014 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 4015 | { |
72d0e1cb | 4016 | int i; |
0fd73091 CB |
4017 | struct lxc_list *it, *next; |
4018 | const char *k = NULL; | |
4019 | bool all = false, done = false; | |
72d0e1cb | 4020 | |
17ed13a3 SH |
4021 | if (strcmp(key, "lxc.hook") == 0) |
4022 | all = true; | |
6333c915 CB |
4023 | else if (strncmp(key, "lxc.hook.", STRLITERALLEN("lxc.hook.")) == 0) |
4024 | k = key + STRLITERALLEN("lxc.hook."); | |
a6390f01 WB |
4025 | else |
4026 | return -1; | |
17ed13a3 | 4027 | |
0fd73091 | 4028 | for (i = 0; i < NUM_LXC_HOOKS; i++) { |
17ed13a3 | 4029 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
0fd73091 | 4030 | lxc_list_for_each_safe (it, &c->hooks[i], next) { |
17ed13a3 SH |
4031 | lxc_list_del(it); |
4032 | free(it->elem); | |
4033 | free(it); | |
4034 | } | |
0fd73091 | 4035 | |
17ed13a3 | 4036 | done = true; |
72d0e1cb SG |
4037 | } |
4038 | } | |
17ed13a3 SH |
4039 | |
4040 | if (!done) { | |
4041 | ERROR("Invalid hook key: %s", key); | |
4042 | return -1; | |
4043 | } | |
0fd73091 | 4044 | |
72d0e1cb SG |
4045 | return 0; |
4046 | } | |
8eb5694b | 4047 | |
4184c3e1 SH |
4048 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
4049 | { | |
0fd73091 | 4050 | struct lxc_list *it, *next; |
4184c3e1 | 4051 | |
0fd73091 | 4052 | lxc_list_for_each_safe (it, &conf->aliens, next) { |
4184c3e1 SH |
4053 | lxc_list_del(it); |
4054 | free(it->elem); | |
4055 | free(it); | |
4056 | } | |
4057 | } | |
4058 | ||
c7b15d1e | 4059 | void lxc_clear_includes(struct lxc_conf *conf) |
f979ac15 | 4060 | { |
0fd73091 | 4061 | struct lxc_list *it, *next; |
f979ac15 | 4062 | |
0fd73091 | 4063 | lxc_list_for_each_safe (it, &conf->includes, next) { |
f979ac15 SH |
4064 | lxc_list_del(it); |
4065 | free(it->elem); | |
4066 | free(it); | |
4067 | } | |
4068 | } | |
4069 | ||
1800f924 WB |
4070 | int lxc_clear_apparmor_raw(struct lxc_conf *c) |
4071 | { | |
4072 | struct lxc_list *it, *next; | |
4073 | ||
4074 | lxc_list_for_each_safe (it, &c->lsm_aa_raw, next) { | |
4075 | lxc_list_del(it); | |
4076 | free(it->elem); | |
4077 | free(it); | |
4078 | } | |
4079 | ||
4080 | return 0; | |
4081 | } | |
4082 | ||
8eb5694b SH |
4083 | void lxc_conf_free(struct lxc_conf *conf) |
4084 | { | |
4085 | if (!conf) | |
4086 | return; | |
0fd73091 | 4087 | |
858377e4 SH |
4088 | if (current_config == conf) |
4089 | current_config = NULL; | |
aed105d5 | 4090 | lxc_terminal_conf_free(&conf->console); |
f10fad2f | 4091 | free(conf->rootfs.mount); |
b3b8c97f | 4092 | free(conf->rootfs.bdev_type); |
f10fad2f ME |
4093 | free(conf->rootfs.options); |
4094 | free(conf->rootfs.path); | |
f10fad2f | 4095 | free(conf->logfile); |
858377e4 SH |
4096 | if (conf->logfd != -1) |
4097 | close(conf->logfd); | |
f10fad2f | 4098 | free(conf->utsname); |
885766f5 CB |
4099 | free(conf->ttys.dir); |
4100 | free(conf->ttys.tty_names); | |
f10fad2f ME |
4101 | free(conf->fstab); |
4102 | free(conf->rcfile); | |
5cda27c1 | 4103 | free(conf->execute_cmd); |
f10fad2f | 4104 | free(conf->init_cmd); |
3c491553 | 4105 | free(conf->init_cwd); |
6b0d5538 | 4106 | free(conf->unexpanded_config); |
76d0127f | 4107 | free(conf->syslog); |
c302b476 | 4108 | lxc_free_networks(&conf->network); |
f10fad2f | 4109 | free(conf->lsm_aa_profile); |
1800f924 | 4110 | free(conf->lsm_aa_profile_computed); |
f10fad2f | 4111 | free(conf->lsm_se_context); |
769872f9 | 4112 | lxc_seccomp_free(conf); |
8eb5694b | 4113 | lxc_clear_config_caps(conf); |
1fb86a7c | 4114 | lxc_clear_config_keepcaps(conf); |
54860ed0 CB |
4115 | lxc_clear_cgroups(conf, "lxc.cgroup", CGROUP_SUPER_MAGIC); |
4116 | lxc_clear_cgroups(conf, "lxc.cgroup2", CGROUP2_SUPER_MAGIC); | |
17ed13a3 | 4117 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 4118 | lxc_clear_mount_entries(conf); |
27c27d73 | 4119 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 4120 | lxc_clear_groups(conf); |
f979ac15 | 4121 | lxc_clear_includes(conf); |
761d81ca | 4122 | lxc_clear_aliens(conf); |
ab799c0b | 4123 | lxc_clear_environment(conf); |
240d4b74 | 4124 | lxc_clear_limits(conf, "lxc.prlimit"); |
7edd0540 | 4125 | lxc_clear_sysctls(conf, "lxc.sysctl"); |
61d7a733 | 4126 | lxc_clear_procs(conf, "lxc.proc"); |
1800f924 | 4127 | lxc_clear_apparmor_raw(conf); |
43654d34 CB |
4128 | free(conf->cgroup_meta.dir); |
4129 | free(conf->cgroup_meta.controllers); | |
7a41e857 LT |
4130 | free(conf->shmount.path_host); |
4131 | free(conf->shmount.path_cont); | |
8eb5694b SH |
4132 | free(conf); |
4133 | } | |
4355ab5f SH |
4134 | |
4135 | struct userns_fn_data { | |
4136 | int (*fn)(void *); | |
c9b7c33e | 4137 | const char *fn_name; |
4355ab5f SH |
4138 | void *arg; |
4139 | int p[2]; | |
4140 | }; | |
4141 | ||
4142 | static int run_userns_fn(void *data) | |
4143 | { | |
adaffdd7 | 4144 | int ret; |
4355ab5f | 4145 | char c; |
0fd73091 | 4146 | struct userns_fn_data *d = data; |
4355ab5f | 4147 | |
f8aa4bf3 | 4148 | /* Close write end of the pipe. */ |
4355ab5f | 4149 | close(d->p[1]); |
f8aa4bf3 CB |
4150 | |
4151 | /* Wait for parent to finish establishing a new mapping in the user | |
4152 | * namespace we are executing in. | |
4153 | */ | |
adaffdd7 | 4154 | ret = lxc_read_nointr(d->p[0], &c, 1); |
f8aa4bf3 | 4155 | /* Close read end of the pipe. */ |
4355ab5f | 4156 | close(d->p[0]); |
adaffdd7 CB |
4157 | if (ret != 1) |
4158 | return -1; | |
f8aa4bf3 | 4159 | |
c9b7c33e | 4160 | if (d->fn_name) |
adaffdd7 | 4161 | TRACE("Calling function \"%s\"", d->fn_name); |
0fd73091 | 4162 | |
f8aa4bf3 | 4163 | /* Call function to run. */ |
4355ab5f SH |
4164 | return d->fn(d->arg); |
4165 | } | |
4166 | ||
db7cfe23 CB |
4167 | static struct id_map *mapped_nsid_add(struct lxc_conf *conf, unsigned id, |
4168 | enum idtype idtype) | |
4169 | { | |
5173b710 CB |
4170 | const struct id_map *map; |
4171 | struct id_map *retmap; | |
db7cfe23 CB |
4172 | |
4173 | map = find_mapped_nsid_entry(conf, id, idtype); | |
4174 | if (!map) | |
4175 | return NULL; | |
4176 | ||
4177 | retmap = malloc(sizeof(*retmap)); | |
4178 | if (!retmap) | |
4179 | return NULL; | |
4180 | ||
4181 | memcpy(retmap, map, sizeof(*retmap)); | |
4182 | return retmap; | |
4183 | } | |
4184 | ||
c4333195 CB |
4185 | static struct id_map *find_mapped_hostid_entry(struct lxc_conf *conf, |
4186 | unsigned id, enum idtype idtype) | |
f8aa4bf3 | 4187 | { |
f8aa4bf3 | 4188 | struct id_map *map; |
0fd73091 | 4189 | struct lxc_list *it; |
f8aa4bf3 CB |
4190 | struct id_map *retmap = NULL; |
4191 | ||
0fd73091 | 4192 | lxc_list_for_each (it, &conf->id_map) { |
f8aa4bf3 CB |
4193 | map = it->elem; |
4194 | if (map->idtype != idtype) | |
4195 | continue; | |
4196 | ||
4197 | if (id >= map->hostid && id < map->hostid + map->range) { | |
4198 | retmap = map; | |
4199 | break; | |
4200 | } | |
4201 | } | |
4202 | ||
f8aa4bf3 CB |
4203 | return retmap; |
4204 | } | |
4205 | ||
0fd73091 | 4206 | /* Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
f8aa4bf3 | 4207 | * existing one or establish a new one. |
4355ab5f | 4208 | */ |
0fd73091 CB |
4209 | static struct id_map *mapped_hostid_add(struct lxc_conf *conf, uid_t id, |
4210 | enum idtype type) | |
4355ab5f | 4211 | { |
28a2d9e7 | 4212 | int hostid_mapped; |
c4333195 CB |
4213 | struct id_map *entry = NULL, *tmp = NULL; |
4214 | ||
4215 | entry = malloc(sizeof(*entry)); | |
4216 | if (!entry) | |
4217 | return NULL; | |
f8aa4bf3 | 4218 | |
28a2d9e7 | 4219 | /* Reuse existing mapping. */ |
c4333195 CB |
4220 | tmp = find_mapped_hostid_entry(conf, id, type); |
4221 | if (tmp) | |
4222 | return memcpy(entry, tmp, sizeof(*entry)); | |
f8aa4bf3 | 4223 | |
28a2d9e7 CB |
4224 | /* Find new mapping. */ |
4225 | hostid_mapped = find_unmapped_nsid(conf, type); | |
4226 | if (hostid_mapped < 0) { | |
c4333195 CB |
4227 | DEBUG("Failed to find free mapping for id %d", id); |
4228 | free(entry); | |
28a2d9e7 | 4229 | return NULL; |
f8aa4bf3 | 4230 | } |
f8aa4bf3 | 4231 | |
28a2d9e7 CB |
4232 | entry->idtype = type; |
4233 | entry->nsid = hostid_mapped; | |
4234 | entry->hostid = (unsigned long)id; | |
4235 | entry->range = 1; | |
4355ab5f | 4236 | |
28a2d9e7 | 4237 | return entry; |
4355ab5f SH |
4238 | } |
4239 | ||
dcf0ffdf | 4240 | struct lxc_list *get_minimal_idmap(struct lxc_conf *conf) |
4355ab5f | 4241 | { |
f8aa4bf3 | 4242 | uid_t euid, egid; |
4160c3a0 CB |
4243 | uid_t nsuid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; |
4244 | gid_t nsgid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
f8aa4bf3 | 4245 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
28a2d9e7 CB |
4246 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, |
4247 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4355ab5f | 4248 | |
db7cfe23 | 4249 | /* Find container root mappings. */ |
4160c3a0 | 4250 | container_root_uid = mapped_nsid_add(conf, nsuid, ID_TYPE_UID); |
db7cfe23 | 4251 | if (!container_root_uid) { |
dcf0ffdf | 4252 | DEBUG("Failed to find mapping for namespace uid %d", 0); |
db7cfe23 | 4253 | goto on_error; |
f8aa4bf3 | 4254 | } |
dcf0ffdf CB |
4255 | euid = geteuid(); |
4256 | if (euid >= container_root_uid->hostid && | |
4257 | euid < (container_root_uid->hostid + container_root_uid->range)) | |
db7cfe23 | 4258 | host_uid_map = container_root_uid; |
f8aa4bf3 | 4259 | |
4160c3a0 | 4260 | container_root_gid = mapped_nsid_add(conf, nsgid, ID_TYPE_GID); |
db7cfe23 | 4261 | if (!container_root_gid) { |
dcf0ffdf | 4262 | DEBUG("Failed to find mapping for namespace gid %d", 0); |
f8aa4bf3 CB |
4263 | goto on_error; |
4264 | } | |
dcf0ffdf CB |
4265 | egid = getegid(); |
4266 | if (egid >= container_root_gid->hostid && | |
4267 | egid < (container_root_gid->hostid + container_root_gid->range)) | |
db7cfe23 | 4268 | host_gid_map = container_root_gid; |
f8aa4bf3 CB |
4269 | |
4270 | /* Check whether the {g,u}id of the user has a mapping. */ | |
954b7d9b | 4271 | if (!host_uid_map) |
c4333195 | 4272 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
28a2d9e7 | 4273 | if (!host_uid_map) { |
db7cfe23 | 4274 | DEBUG("Failed to find mapping for uid %d", euid); |
f8aa4bf3 CB |
4275 | goto on_error; |
4276 | } | |
4277 | ||
dcf0ffdf CB |
4278 | if (!host_gid_map) |
4279 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); | |
28a2d9e7 | 4280 | if (!host_gid_map) { |
db7cfe23 | 4281 | DEBUG("Failed to find mapping for gid %d", egid); |
28a2d9e7 CB |
4282 | goto on_error; |
4283 | } | |
4284 | ||
4285 | /* Allocate new {g,u}id map list. */ | |
4286 | idmap = malloc(sizeof(*idmap)); | |
4287 | if (!idmap) | |
4288 | goto on_error; | |
4289 | lxc_list_init(idmap); | |
4290 | ||
f8aa4bf3 CB |
4291 | /* Add container root to the map. */ |
4292 | tmplist = malloc(sizeof(*tmplist)); | |
4293 | if (!tmplist) | |
4294 | goto on_error; | |
4295 | lxc_list_add_elem(tmplist, container_root_uid); | |
4296 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4297 | |
1d90e064 | 4298 | if (host_uid_map && (host_uid_map != container_root_uid)) { |
28a2d9e7 CB |
4299 | /* idmap will now keep track of that memory. */ |
4300 | container_root_uid = NULL; | |
4301 | ||
4302 | /* Add container root to the map. */ | |
4303 | tmplist = malloc(sizeof(*tmplist)); | |
4304 | if (!tmplist) | |
4305 | goto on_error; | |
4306 | lxc_list_add_elem(tmplist, host_uid_map); | |
4307 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4308 | } |
1d90e064 CB |
4309 | /* idmap will now keep track of that memory. */ |
4310 | container_root_uid = NULL; | |
4311 | /* idmap will now keep track of that memory. */ | |
4312 | host_uid_map = NULL; | |
f8aa4bf3 CB |
4313 | |
4314 | tmplist = malloc(sizeof(*tmplist)); | |
4315 | if (!tmplist) | |
4316 | goto on_error; | |
4317 | lxc_list_add_elem(tmplist, container_root_gid); | |
4318 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4319 | |
1d90e064 | 4320 | if (host_gid_map && (host_gid_map != container_root_gid)) { |
28a2d9e7 CB |
4321 | /* idmap will now keep track of that memory. */ |
4322 | container_root_gid = NULL; | |
4323 | ||
4324 | tmplist = malloc(sizeof(*tmplist)); | |
4325 | if (!tmplist) | |
4326 | goto on_error; | |
4327 | lxc_list_add_elem(tmplist, host_gid_map); | |
4328 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4329 | } |
1d90e064 CB |
4330 | /* idmap will now keep track of that memory. */ |
4331 | container_root_gid = NULL; | |
4332 | /* idmap will now keep track of that memory. */ | |
4333 | host_gid_map = NULL; | |
f8aa4bf3 | 4334 | |
dcf0ffdf CB |
4335 | TRACE("Allocated minimal idmapping"); |
4336 | return idmap; | |
4337 | ||
4338 | on_error: | |
4dc41f99 | 4339 | if (idmap) { |
dcf0ffdf | 4340 | lxc_free_idmap(idmap); |
4dc41f99 SX |
4341 | free(idmap); |
4342 | } | |
dcf0ffdf CB |
4343 | if (container_root_uid) |
4344 | free(container_root_uid); | |
4345 | if (container_root_gid) | |
4346 | free(container_root_gid); | |
4347 | if (host_uid_map && (host_uid_map != container_root_uid)) | |
4348 | free(host_uid_map); | |
4349 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4350 | free(host_gid_map); | |
4351 | ||
4352 | return NULL; | |
4353 | } | |
4354 | ||
4355 | /* Run a function in a new user namespace. | |
4356 | * The caller's euid/egid will be mapped if it is not already. | |
4357 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
4358 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
4359 | * This means we require only to establish a mapping from: | |
4360 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
4361 | * - the container root -> some sub{g,u}id | |
915e3dbd | 4362 | * The former we add, if the user did not specify a mapping. The latter we |
6f3fd27f | 4363 | * retrieve from the container's configured {g,u}id mappings as it must have been |
dcf0ffdf CB |
4364 | * there to start the container in the first place. |
4365 | */ | |
4366 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data, | |
4367 | const char *fn_name) | |
4368 | { | |
4369 | pid_t pid; | |
dcf0ffdf | 4370 | int p[2]; |
0fd73091 | 4371 | struct userns_fn_data d; |
dcf0ffdf | 4372 | struct lxc_list *idmap; |
0fd73091 CB |
4373 | int ret = -1, status = -1; |
4374 | char c = '1'; | |
dcf0ffdf | 4375 | |
2b2655a8 CB |
4376 | if (!conf) |
4377 | return -EINVAL; | |
4378 | ||
dcf0ffdf CB |
4379 | idmap = get_minimal_idmap(conf); |
4380 | if (!idmap) | |
4381 | return -1; | |
4382 | ||
979f9e34 | 4383 | ret = pipe2(p, O_CLOEXEC); |
dcf0ffdf CB |
4384 | if (ret < 0) { |
4385 | SYSERROR("Failed to create pipe"); | |
4386 | return -1; | |
4387 | } | |
4388 | d.fn = fn; | |
4389 | d.fn_name = fn_name; | |
4390 | d.arg = data; | |
4391 | d.p[0] = p[0]; | |
4392 | d.p[1] = p[1]; | |
4393 | ||
4394 | /* Clone child in new user namespace. */ | |
4395 | pid = lxc_raw_clone_cb(run_userns_fn, &d, CLONE_NEWUSER); | |
4396 | if (pid < 0) { | |
0fd73091 | 4397 | ERROR("Failed to clone process in new user namespace"); |
dcf0ffdf CB |
4398 | goto on_error; |
4399 | } | |
4400 | ||
4401 | close(p[0]); | |
4402 | p[0] = -1; | |
4403 | ||
4b73005c CB |
4404 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || |
4405 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
dcf0ffdf | 4406 | struct id_map *map; |
0fd73091 | 4407 | struct lxc_list *it; |
dcf0ffdf | 4408 | |
0fd73091 | 4409 | lxc_list_for_each (it, idmap) { |
f8aa4bf3 | 4410 | map = it->elem; |
dcf0ffdf | 4411 | TRACE("Establishing %cid mapping for \"%d\" in new " |
f8aa4bf3 | 4412 | "user namespace: nsuid %lu - hostid %lu - range " |
0fd73091 CB |
4413 | "%lu", |
4414 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4415 | map->nsid, map->hostid, map->range); | |
f8aa4bf3 | 4416 | } |
4355ab5f SH |
4417 | } |
4418 | ||
f8aa4bf3 | 4419 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 4420 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 | 4421 | if (ret < 0) { |
0fd73091 | 4422 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); |
f8aa4bf3 | 4423 | goto on_error; |
4355ab5f SH |
4424 | } |
4425 | ||
f8aa4bf3 | 4426 | /* Tell child to proceed. */ |
489f39be | 4427 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
dcf0ffdf | 4428 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
f8aa4bf3 | 4429 | goto on_error; |
4355ab5f SH |
4430 | } |
4431 | ||
686dd5d1 | 4432 | on_error: |
4355ab5f SH |
4433 | if (p[0] != -1) |
4434 | close(p[0]); | |
4435 | close(p[1]); | |
f8aa4bf3 | 4436 | |
ee1b16bc TA |
4437 | /* Wait for child to finish. */ |
4438 | if (pid > 0) | |
4439 | status = wait_for_pid(pid); | |
4440 | ||
686dd5d1 CB |
4441 | if (status < 0) |
4442 | ret = -1; | |
4443 | ||
f8aa4bf3 | 4444 | return ret; |
4355ab5f | 4445 | } |
97e9cfa0 | 4446 | |
415a8851 CB |
4447 | int userns_exec_full(struct lxc_conf *conf, int (*fn)(void *), void *data, |
4448 | const char *fn_name) | |
4449 | { | |
4450 | pid_t pid; | |
4451 | uid_t euid, egid; | |
415a8851 CB |
4452 | int p[2]; |
4453 | struct id_map *map; | |
4454 | struct lxc_list *cur; | |
0fd73091 | 4455 | struct userns_fn_data d; |
415a8851 | 4456 | int ret = -1; |
0fd73091 | 4457 | char c = '1'; |
415a8851 CB |
4458 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
4459 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, | |
4460 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4461 | ||
2b2655a8 CB |
4462 | if (!conf) |
4463 | return -EINVAL; | |
4464 | ||
979f9e34 | 4465 | ret = pipe2(p, O_CLOEXEC); |
415a8851 CB |
4466 | if (ret < 0) { |
4467 | SYSERROR("opening pipe"); | |
4468 | return -1; | |
4469 | } | |
4470 | d.fn = fn; | |
4471 | d.fn_name = fn_name; | |
4472 | d.arg = data; | |
4473 | d.p[0] = p[0]; | |
4474 | d.p[1] = p[1]; | |
4475 | ||
4476 | /* Clone child in new user namespace. */ | |
4477 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER); | |
4478 | if (pid < 0) { | |
0fd73091 | 4479 | ERROR("Failed to clone process in new user namespace"); |
415a8851 CB |
4480 | goto on_error; |
4481 | } | |
4482 | ||
4483 | close(p[0]); | |
4484 | p[0] = -1; | |
4485 | ||
4486 | euid = geteuid(); | |
4487 | egid = getegid(); | |
4488 | ||
4489 | /* Allocate new {g,u}id map list. */ | |
4490 | idmap = malloc(sizeof(*idmap)); | |
4491 | if (!idmap) | |
4492 | goto on_error; | |
4493 | lxc_list_init(idmap); | |
4494 | ||
4495 | /* Find container root. */ | |
0fd73091 | 4496 | lxc_list_for_each (cur, &conf->id_map) { |
415a8851 CB |
4497 | struct id_map *tmpmap; |
4498 | ||
4499 | tmplist = malloc(sizeof(*tmplist)); | |
4500 | if (!tmplist) | |
4501 | goto on_error; | |
4502 | ||
4503 | tmpmap = malloc(sizeof(*tmpmap)); | |
4504 | if (!tmpmap) { | |
4505 | free(tmplist); | |
4506 | goto on_error; | |
4507 | } | |
4508 | ||
4509 | memset(tmpmap, 0, sizeof(*tmpmap)); | |
4510 | memcpy(tmpmap, cur->elem, sizeof(*tmpmap)); | |
4511 | tmplist->elem = tmpmap; | |
4512 | ||
4513 | lxc_list_add_tail(idmap, tmplist); | |
4514 | ||
4515 | map = cur->elem; | |
4516 | ||
4517 | if (map->idtype == ID_TYPE_UID) | |
4518 | if (euid >= map->hostid && euid < map->hostid + map->range) | |
4519 | host_uid_map = map; | |
4520 | ||
4521 | if (map->idtype == ID_TYPE_GID) | |
4522 | if (egid >= map->hostid && egid < map->hostid + map->range) | |
4523 | host_gid_map = map; | |
4524 | ||
4525 | if (map->nsid != 0) | |
4526 | continue; | |
4527 | ||
4528 | if (map->idtype == ID_TYPE_UID) | |
4529 | if (container_root_uid == NULL) | |
4530 | container_root_uid = map; | |
4531 | ||
4532 | if (map->idtype == ID_TYPE_GID) | |
4533 | if (container_root_gid == NULL) | |
4534 | container_root_gid = map; | |
4535 | } | |
4536 | ||
4537 | if (!container_root_uid || !container_root_gid) { | |
4538 | ERROR("No mapping for container root found"); | |
4539 | goto on_error; | |
4540 | } | |
4541 | ||
4542 | /* Check whether the {g,u}id of the user has a mapping. */ | |
4543 | if (!host_uid_map) | |
c4333195 | 4544 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
415a8851 CB |
4545 | else |
4546 | host_uid_map = container_root_uid; | |
4547 | ||
4548 | if (!host_gid_map) | |
c4333195 | 4549 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); |
415a8851 CB |
4550 | else |
4551 | host_gid_map = container_root_gid; | |
4552 | ||
4553 | if (!host_uid_map) { | |
4554 | DEBUG("Failed to find mapping for uid %d", euid); | |
4555 | goto on_error; | |
4556 | } | |
4557 | ||
4558 | if (!host_gid_map) { | |
4559 | DEBUG("Failed to find mapping for gid %d", egid); | |
4560 | goto on_error; | |
4561 | } | |
4562 | ||
4563 | if (host_uid_map && (host_uid_map != container_root_uid)) { | |
4564 | /* Add container root to the map. */ | |
4565 | tmplist = malloc(sizeof(*tmplist)); | |
4566 | if (!tmplist) | |
4567 | goto on_error; | |
4568 | lxc_list_add_elem(tmplist, host_uid_map); | |
4569 | lxc_list_add_tail(idmap, tmplist); | |
4570 | } | |
4571 | /* idmap will now keep track of that memory. */ | |
4572 | host_uid_map = NULL; | |
4573 | ||
4574 | if (host_gid_map && (host_gid_map != container_root_gid)) { | |
4575 | tmplist = malloc(sizeof(*tmplist)); | |
4576 | if (!tmplist) | |
4577 | goto on_error; | |
4578 | lxc_list_add_elem(tmplist, host_gid_map); | |
4579 | lxc_list_add_tail(idmap, tmplist); | |
4580 | } | |
4581 | /* idmap will now keep track of that memory. */ | |
4582 | host_gid_map = NULL; | |
4583 | ||
4584 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || | |
4585 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
0fd73091 | 4586 | lxc_list_for_each (cur, idmap) { |
415a8851 CB |
4587 | map = cur->elem; |
4588 | TRACE("establishing %cid mapping for \"%d\" in new " | |
4589 | "user namespace: nsuid %lu - hostid %lu - range " | |
4590 | "%lu", | |
4591 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4592 | map->nsid, map->hostid, map->range); | |
4593 | } | |
4594 | } | |
4595 | ||
4596 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
4597 | ret = lxc_map_ids(idmap, pid); | |
4598 | if (ret < 0) { | |
0fd73091 | 4599 | ERROR("error setting up {g,u}id mappings for child process \"%d\"", pid); |
415a8851 CB |
4600 | goto on_error; |
4601 | } | |
4602 | ||
4603 | /* Tell child to proceed. */ | |
489f39be | 4604 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
0fd73091 | 4605 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
415a8851 CB |
4606 | goto on_error; |
4607 | } | |
4608 | ||
686dd5d1 | 4609 | on_error: |
ee1b16bc TA |
4610 | if (p[0] != -1) |
4611 | close(p[0]); | |
4612 | close(p[1]); | |
4613 | ||
415a8851 | 4614 | /* Wait for child to finish. */ |
686dd5d1 CB |
4615 | if (pid > 0) |
4616 | ret = wait_for_pid(pid); | |
415a8851 | 4617 | |
80758b4b | 4618 | if (idmap) { |
415a8851 | 4619 | lxc_free_idmap(idmap); |
80758b4b DJ |
4620 | free(idmap); |
4621 | } | |
4622 | ||
415a8851 CB |
4623 | if (host_uid_map && (host_uid_map != container_root_uid)) |
4624 | free(host_uid_map); | |
4625 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4626 | free(host_gid_map); | |
4627 | ||
415a8851 CB |
4628 | return ret; |
4629 | } | |
4630 | ||
a96a8e8c | 4631 | /* not thread-safe, do not use from api without first forking */ |
0fd73091 | 4632 | static char *getuname(void) |
97e9cfa0 | 4633 | { |
cb7aa5e8 DJ |
4634 | struct passwd pwent; |
4635 | struct passwd *pwentp = NULL; | |
4636 | char *buf; | |
4637 | char *username; | |
4638 | size_t bufsize; | |
4639 | int ret; | |
97e9cfa0 | 4640 | |
cb7aa5e8 DJ |
4641 | bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); |
4642 | if (bufsize == -1) | |
4643 | bufsize = 1024; | |
4644 | ||
4645 | buf = malloc(bufsize); | |
4646 | if (!buf) | |
97e9cfa0 SH |
4647 | return NULL; |
4648 | ||
cb7aa5e8 DJ |
4649 | ret = getpwuid_r(geteuid(), &pwent, buf, bufsize, &pwentp); |
4650 | if (!pwentp) { | |
4651 | if (ret == 0) | |
4652 | WARN("Could not find matched password record."); | |
4653 | ||
4654 | ERROR("Failed to get password record - %u", geteuid()); | |
4655 | free(buf); | |
4656 | return NULL; | |
4657 | } | |
4658 | ||
4659 | username = strdup(pwent.pw_name); | |
4660 | free(buf); | |
4661 | ||
4662 | return username; | |
97e9cfa0 SH |
4663 | } |
4664 | ||
a96a8e8c | 4665 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4666 | static char *getgname(void) |
4667 | { | |
3de9fb4c DJ |
4668 | struct group grent; |
4669 | struct group *grentp = NULL; | |
4670 | char *buf; | |
4671 | char *grname; | |
4672 | size_t bufsize; | |
4673 | int ret; | |
4674 | ||
4675 | bufsize = sysconf(_SC_GETGR_R_SIZE_MAX); | |
4676 | if (bufsize == -1) | |
4677 | bufsize = 1024; | |
4678 | ||
4679 | buf = malloc(bufsize); | |
4680 | if (!buf) | |
4681 | return NULL; | |
4682 | ||
4683 | ret = getgrgid_r(getegid(), &grent, buf, bufsize, &grentp); | |
4684 | if (!grentp) { | |
4685 | if (ret == 0) | |
4686 | WARN("Could not find matched group record"); | |
97e9cfa0 | 4687 | |
3de9fb4c DJ |
4688 | ERROR("Failed to get group record - %u", getegid()); |
4689 | free(buf); | |
97e9cfa0 | 4690 | return NULL; |
3de9fb4c DJ |
4691 | } |
4692 | ||
4693 | grname = strdup(grent.gr_name); | |
4694 | free(buf); | |
97e9cfa0 | 4695 | |
3de9fb4c | 4696 | return grname; |
97e9cfa0 SH |
4697 | } |
4698 | ||
a96a8e8c | 4699 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4700 | void suggest_default_idmap(void) |
4701 | { | |
0fd73091 | 4702 | char *uname, *gname; |
97e9cfa0 SH |
4703 | FILE *f; |
4704 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; | |
97e9cfa0 | 4705 | size_t len = 0; |
0fd73091 | 4706 | char *line = NULL; |
97e9cfa0 | 4707 | |
0fd73091 CB |
4708 | uname = getuname(); |
4709 | if (!uname) | |
97e9cfa0 SH |
4710 | return; |
4711 | ||
0fd73091 CB |
4712 | gname = getgname(); |
4713 | if (!gname) { | |
97e9cfa0 SH |
4714 | free(uname); |
4715 | return; | |
4716 | } | |
4717 | ||
4718 | f = fopen(subuidfile, "r"); | |
4719 | if (!f) { | |
4720 | ERROR("Your system is not configured with subuids"); | |
4721 | free(gname); | |
4722 | free(uname); | |
4723 | return; | |
4724 | } | |
0fd73091 | 4725 | |
97e9cfa0 | 4726 | while (getline(&line, &len, f) != -1) { |
0fd73091 | 4727 | char *p, *p2; |
b7930180 | 4728 | size_t no_newline = 0; |
0fd73091 CB |
4729 | |
4730 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4731 | if (*line == '#') |
4732 | continue; | |
4733 | if (!p) | |
4734 | continue; | |
4735 | *p = '\0'; | |
4736 | p++; | |
0fd73091 | 4737 | |
97e9cfa0 SH |
4738 | if (strcmp(line, uname)) |
4739 | continue; | |
0fd73091 | 4740 | |
97e9cfa0 SH |
4741 | p2 = strchr(p, ':'); |
4742 | if (!p2) | |
4743 | continue; | |
4744 | *p2 = '\0'; | |
4745 | p2++; | |
4746 | if (!*p2) | |
4747 | continue; | |
b7930180 CB |
4748 | no_newline = strcspn(p2, "\n"); |
4749 | p2[no_newline] = '\0'; | |
4750 | ||
b7b2fde4 | 4751 | if (lxc_safe_uint(p, &uid) < 0) |
0fd73091 | 4752 | WARN("Could not parse UID"); |
b7b2fde4 | 4753 | if (lxc_safe_uint(p2, &urange) < 0) |
0fd73091 | 4754 | WARN("Could not parse UID range"); |
97e9cfa0 SH |
4755 | } |
4756 | fclose(f); | |
4757 | ||
6be7389a | 4758 | f = fopen(subgidfile, "r"); |
97e9cfa0 SH |
4759 | if (!f) { |
4760 | ERROR("Your system is not configured with subgids"); | |
4761 | free(gname); | |
4762 | free(uname); | |
4763 | return; | |
4764 | } | |
0fd73091 | 4765 | |
97e9cfa0 | 4766 | while (getline(&line, &len, f) != -1) { |
0fd73091 | 4767 | char *p, *p2; |
b7930180 | 4768 | size_t no_newline = 0; |
0fd73091 CB |
4769 | |
4770 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4771 | if (*line == '#') |
4772 | continue; | |
4773 | if (!p) | |
4774 | continue; | |
4775 | *p = '\0'; | |
4776 | p++; | |
0fd73091 | 4777 | |
97e9cfa0 SH |
4778 | if (strcmp(line, uname)) |
4779 | continue; | |
0fd73091 | 4780 | |
97e9cfa0 SH |
4781 | p2 = strchr(p, ':'); |
4782 | if (!p2) | |
4783 | continue; | |
4784 | *p2 = '\0'; | |
4785 | p2++; | |
4786 | if (!*p2) | |
4787 | continue; | |
b7930180 CB |
4788 | no_newline = strcspn(p2, "\n"); |
4789 | p2[no_newline] = '\0'; | |
4790 | ||
b7b2fde4 | 4791 | if (lxc_safe_uint(p, &gid) < 0) |
0fd73091 | 4792 | WARN("Could not parse GID"); |
b7b2fde4 | 4793 | if (lxc_safe_uint(p2, &grange) < 0) |
0fd73091 | 4794 | WARN("Could not parse GID range"); |
97e9cfa0 SH |
4795 | } |
4796 | fclose(f); | |
4797 | ||
f10fad2f | 4798 | free(line); |
97e9cfa0 SH |
4799 | |
4800 | if (!urange || !grange) { | |
4801 | ERROR("You do not have subuids or subgids allocated"); | |
4802 | ERROR("Unprivileged containers require subuids and subgids"); | |
fbd4a4d1 | 4803 | free(uname); |
1e7cd2f7 | 4804 | free(gname); |
97e9cfa0 SH |
4805 | return; |
4806 | } | |
4807 | ||
4808 | ERROR("You must either run as root, or define uid mappings"); | |
4809 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4810 | ERROR("~/.config/lxc/default.conf:"); | |
4811 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
bdcbb6b3 CB |
4812 | ERROR("lxc.idmap = u 0 %u %u", uid, urange); |
4813 | ERROR("lxc.idmap = g 0 %u %u", gid, grange); | |
97e9cfa0 SH |
4814 | |
4815 | free(gname); | |
4816 | free(uname); | |
4817 | } | |
aaf26830 | 4818 | |
a7307747 SH |
4819 | static void free_cgroup_settings(struct lxc_list *result) |
4820 | { | |
4821 | struct lxc_list *iterator, *next; | |
4822 | ||
0fd73091 | 4823 | lxc_list_for_each_safe (iterator, result, next) { |
a7307747 SH |
4824 | lxc_list_del(iterator); |
4825 | free(iterator); | |
4826 | } | |
4827 | free(result); | |
4828 | } | |
4829 | ||
0fd73091 | 4830 | /* Return the list of cgroup_settings sorted according to the following rules |
aaf26830 KT |
4831 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes |
4832 | */ | |
0fd73091 | 4833 | struct lxc_list *sort_cgroup_settings(struct lxc_list *cgroup_settings) |
aaf26830 KT |
4834 | { |
4835 | struct lxc_list *result; | |
aaf26830 | 4836 | struct lxc_cgroup *cg = NULL; |
0fd73091 | 4837 | struct lxc_list *it = NULL, *item = NULL, *memsw_limit = NULL; |
aaf26830 KT |
4838 | |
4839 | result = malloc(sizeof(*result)); | |
0fd73091 | 4840 | if (!result) |
fac7c663 | 4841 | return NULL; |
aaf26830 KT |
4842 | lxc_list_init(result); |
4843 | ||
0fd73091 CB |
4844 | /* Iterate over the cgroup settings and copy them to the output list. */ |
4845 | lxc_list_for_each (it, cgroup_settings) { | |
aaf26830 | 4846 | item = malloc(sizeof(*item)); |
fac7c663 | 4847 | if (!item) { |
a7307747 | 4848 | free_cgroup_settings(result); |
fac7c663 KT |
4849 | return NULL; |
4850 | } | |
0fd73091 | 4851 | |
aaf26830 KT |
4852 | item->elem = it->elem; |
4853 | cg = it->elem; | |
4854 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
4855 | /* Store the memsw_limit location */ | |
4856 | memsw_limit = item; | |
0fd73091 CB |
4857 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && |
4858 | memsw_limit != NULL) { | |
4859 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found | |
4860 | * before lxc.cgroup.memory.limit_in_bytes, swap these | |
4861 | * two items */ | |
aaf26830 KT |
4862 | item->elem = memsw_limit->elem; |
4863 | memsw_limit->elem = it->elem; | |
4864 | } | |
4865 | lxc_list_add_tail(result, item); | |
4866 | } | |
4867 | ||
4868 | return result; | |
a7307747 | 4869 | } |