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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 | ||
0fd73091 | 1081 | TRACE("Sent ty \"%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 | ||
0fd73091 CB |
1400 | /* The following code cleans up inhereted mounts which are not required |
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 | * | |
1407 | * This loop can be skipped if a container uses unserns, because all | |
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 | ||
0fd73091 CB |
1450 | /* This also can be skipped if a container uses unserns. */ |
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 | { |
8ce1abc2 | 1497 | int newroot = -1, oldroot = -1, ret = -1; |
0fd73091 | 1498 | |
8ce1abc2 CB |
1499 | oldroot = open("/", O_DIRECTORY | O_RDONLY); |
1500 | if (oldroot < 0) { | |
1501 | SYSERROR("Failed to open old root directory"); | |
1502 | return -1; | |
39c7b795 | 1503 | } |
ac778708 | 1504 | |
8ce1abc2 CB |
1505 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY); |
1506 | if (newroot < 0) { | |
1507 | SYSERROR("Failed to open new root directory"); | |
1508 | goto on_error; | |
1509 | } | |
0fd73091 | 1510 | |
8ce1abc2 CB |
1511 | /* change into new root fs */ |
1512 | ret = fchdir(newroot); | |
1513 | if (ret < 0) { | |
1514 | ret = -1; | |
1515 | SYSERROR("Failed to change to new rootfs \"%s\"", rootfs); | |
1516 | goto on_error; | |
1517 | } | |
39c7b795 | 1518 | |
8ce1abc2 CB |
1519 | /* pivot_root into our new root fs */ |
1520 | ret = pivot_root(".", "."); | |
1521 | if (ret < 0) { | |
1522 | ret = -1; | |
1523 | SYSERROR("Failed to pivot_root()"); | |
1524 | goto on_error; | |
39c7b795 CB |
1525 | } |
1526 | ||
8ce1abc2 CB |
1527 | /* At this point the old-root is mounted on top of our new-root. To |
1528 | * unmounted it we must not be chdir'd into it, so escape back to | |
1529 | * old-root. | |
1530 | */ | |
1531 | ret = fchdir(oldroot); | |
0fd73091 | 1532 | if (ret < 0) { |
8ce1abc2 CB |
1533 | ret = -1; |
1534 | SYSERROR("Failed to enter old root directory"); | |
1535 | goto on_error; | |
c69bd12f DL |
1536 | } |
1537 | ||
8ce1abc2 CB |
1538 | /* Make oldroot rslave to make sure our umounts don't propagate to the |
1539 | * host. | |
1540 | */ | |
1541 | ret = mount("", ".", "", MS_SLAVE | MS_REC, NULL); | |
1542 | if (ret < 0) { | |
1543 | ret = -1; | |
1544 | SYSERROR("Failed to make oldroot rslave"); | |
1545 | goto on_error; | |
1546 | } | |
1547 | ||
1548 | ret = umount2(".", MNT_DETACH); | |
1549 | if (ret < 0) { | |
1550 | ret = -1; | |
1551 | SYSERROR("Failed to detach old root directory"); | |
1552 | goto on_error; | |
1553 | } | |
1554 | ||
1555 | ret = fchdir(newroot); | |
1556 | if (ret < 0) { | |
1557 | ret = -1; | |
1558 | SYSERROR("Failed to re-enter new root directory"); | |
1559 | goto on_error; | |
1560 | } | |
1561 | ||
1562 | ret = 0; | |
1563 | ||
1564 | TRACE("pivot_root(\"%s\") successful", rootfs); | |
1565 | ||
1566 | on_error: | |
1567 | if (oldroot != -1) | |
1568 | close(oldroot); | |
1569 | if (newroot != -1) | |
1570 | close(newroot); | |
1571 | ||
1572 | return ret; | |
0ad19a3f | 1573 | } |
1574 | ||
8ce1abc2 CB |
1575 | static int lxc_setup_rootfs_switch_root(const struct lxc_rootfs *rootfs) |
1576 | { | |
1577 | if (!rootfs->path) { | |
1578 | DEBUG("Container does not have a rootfs"); | |
1579 | return 0; | |
1580 | } | |
1581 | ||
1582 | if (detect_ramfs_rootfs()) | |
1583 | return lxc_chroot(rootfs); | |
1584 | ||
1585 | return lxc_pivot_root(rootfs->mount); | |
0ad19a3f | 1586 | } |
1587 | ||
8ce1abc2 CB |
1588 | static const struct id_map *find_mapped_nsid_entry(struct lxc_conf *conf, |
1589 | unsigned id, | |
1590 | enum idtype idtype) | |
f4900711 CB |
1591 | { |
1592 | struct lxc_list *it; | |
1593 | struct id_map *map; | |
1594 | struct id_map *retmap = NULL; | |
1595 | ||
dcf0ffdf CB |
1596 | /* Shortcut for container's root mappings. */ |
1597 | if (id == 0) { | |
1598 | if (idtype == ID_TYPE_UID) | |
1599 | return conf->root_nsuid_map; | |
1600 | ||
1601 | if (idtype == ID_TYPE_GID) | |
1602 | return conf->root_nsgid_map; | |
1603 | } | |
1604 | ||
f4900711 CB |
1605 | lxc_list_for_each(it, &conf->id_map) { |
1606 | map = it->elem; | |
1607 | if (map->idtype != idtype) | |
1608 | continue; | |
1609 | ||
1610 | if (id >= map->nsid && id < map->nsid + map->range) { | |
1611 | retmap = map; | |
1612 | break; | |
1613 | } | |
1614 | } | |
1615 | ||
1616 | return retmap; | |
1617 | } | |
1618 | ||
1619 | static int lxc_setup_devpts(struct lxc_conf *conf) | |
3c26f34e | 1620 | { |
70761e5e | 1621 | int ret; |
ce155c60 | 1622 | char **opts; |
9d28c4f9 | 1623 | char devpts_mntopts[256]; |
ce155c60 CB |
1624 | char *mntopt_sets[5]; |
1625 | char default_devpts_mntopts[256] = "gid=5,newinstance,ptmxmode=0666,mode=0620"; | |
77890c6d | 1626 | |
e528c735 | 1627 | if (conf->pty_max <= 0) { |
0fd73091 | 1628 | DEBUG("No new devpts instance will be mounted since no pts " |
70761e5e | 1629 | "devices are requested"); |
d852c78c | 1630 | return 0; |
3c26f34e | 1631 | } |
1632 | ||
e528c735 CB |
1633 | ret = snprintf(devpts_mntopts, sizeof(devpts_mntopts), "%s,max=%zu", |
1634 | default_devpts_mntopts, conf->pty_max); | |
9d28c4f9 CB |
1635 | if (ret < 0 || (size_t)ret >= sizeof(devpts_mntopts)) |
1636 | return -1; | |
1637 | ||
77f94854 CB |
1638 | ret = umount2("/dev/pts", MNT_DETACH); |
1639 | if (ret < 0) | |
a24c5678 | 1640 | SYSWARN("Failed to unmount old devpts instance"); |
77f94854 | 1641 | else |
0fd73091 | 1642 | DEBUG("Unmounted old devpts instance"); |
7e40254a | 1643 | |
70761e5e CB |
1644 | /* Create mountpoint for devpts instance. */ |
1645 | ret = mkdir("/dev/pts", 0755); | |
1646 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1647 | SYSERROR("Failed to create \"/dev/pts\" directory"); |
3c26f34e | 1648 | return -1; |
1649 | } | |
1650 | ||
ce155c60 CB |
1651 | /* gid=5 && max= */ |
1652 | mntopt_sets[0] = devpts_mntopts; | |
dfbd4730 | 1653 | |
ce155c60 | 1654 | /* !gid=5 && max= */ |
6333c915 | 1655 | mntopt_sets[1] = devpts_mntopts + STRLITERALLEN("gid=5") + 1; |
ce155c60 CB |
1656 | |
1657 | /* gid=5 && !max= */ | |
1658 | mntopt_sets[2] = default_devpts_mntopts; | |
1659 | ||
1660 | /* !gid=5 && !max= */ | |
6333c915 | 1661 | mntopt_sets[3] = default_devpts_mntopts + STRLITERALLEN("gid=5") + 1; |
ce155c60 CB |
1662 | |
1663 | /* end */ | |
1664 | mntopt_sets[4] = NULL; | |
1665 | ||
1666 | for (ret = -1, opts = mntopt_sets; opts && *opts; opts++) { | |
1667 | /* mount new devpts instance */ | |
1668 | ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, *opts); | |
1669 | if (ret == 0) | |
1670 | break; | |
1671 | } | |
1672 | ||
1673 | if (ret < 0) { | |
1674 | SYSERROR("Failed to mount new devpts instance"); | |
1675 | return -1; | |
70761e5e | 1676 | } |
ce155c60 | 1677 | DEBUG("Mount new devpts instance with options \"%s\"", *opts); |
70761e5e | 1678 | |
d5cb35d6 | 1679 | /* Remove any pre-existing /dev/ptmx file. */ |
b29e05d6 CB |
1680 | ret = remove("/dev/ptmx"); |
1681 | if (ret < 0) { | |
1682 | if (errno != ENOENT) { | |
0fd73091 | 1683 | SYSERROR("Failed to remove existing \"/dev/ptmx\" file"); |
d5cb35d6 | 1684 | return -1; |
70761e5e | 1685 | } |
b29e05d6 | 1686 | } else { |
0fd73091 | 1687 | DEBUG("Removed existing \"/dev/ptmx\" file"); |
3c26f34e | 1688 | } |
1689 | ||
d5cb35d6 | 1690 | /* Create dummy /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
3b7e332f CB |
1691 | ret = mknod("/dev/ptmx", S_IFREG | 0000, 0); |
1692 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1693 | SYSERROR("Failed to create dummy \"/dev/ptmx\" file as bind mount target"); |
d5cb35d6 CB |
1694 | return -1; |
1695 | } | |
0fd73091 | 1696 | DEBUG("Created dummy \"/dev/ptmx\" file as bind mount target"); |
77890c6d | 1697 | |
d5cb35d6 | 1698 | /* Fallback option: create symlink /dev/ptmx -> /dev/pts/ptmx */ |
e87bd19c | 1699 | ret = mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL); |
d5cb35d6 | 1700 | if (!ret) { |
0fd73091 | 1701 | DEBUG("Bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1702 | return 0; |
1703 | } else { | |
1704 | /* Fallthrough and try to create a symlink. */ | |
0fd73091 | 1705 | ERROR("Failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1706 | } |
1707 | ||
1708 | /* Remove the dummy /dev/ptmx file we created above. */ | |
1709 | ret = remove("/dev/ptmx"); | |
70761e5e | 1710 | if (ret < 0) { |
0fd73091 | 1711 | SYSERROR("Failed to remove existing \"/dev/ptmx\""); |
d5cb35d6 CB |
1712 | return -1; |
1713 | } | |
1714 | ||
1715 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
1716 | ret = symlink("/dev/pts/ptmx", "/dev/ptmx"); | |
1717 | if (ret < 0) { | |
0fd73091 | 1718 | SYSERROR("Failed to create symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
3c26f34e | 1719 | return -1; |
1720 | } | |
0fd73091 | 1721 | DEBUG("Created symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
cd54d859 | 1722 | |
3c26f34e | 1723 | return 0; |
1724 | } | |
1725 | ||
cccc74b5 DL |
1726 | static int setup_personality(int persona) |
1727 | { | |
0fd73091 CB |
1728 | int ret; |
1729 | ||
1730 | #if HAVE_SYS_PERSONALITY_H | |
cccc74b5 DL |
1731 | if (persona == -1) |
1732 | return 0; | |
1733 | ||
0fd73091 CB |
1734 | ret = personality(persona); |
1735 | if (ret < 0) { | |
1736 | SYSERROR("Failed to set personality to \"0x%x\"", persona); | |
cccc74b5 DL |
1737 | return -1; |
1738 | } | |
1739 | ||
0fd73091 CB |
1740 | INFO("Set personality to \"0x%x\"", persona); |
1741 | #endif | |
cccc74b5 DL |
1742 | |
1743 | return 0; | |
1744 | } | |
1745 | ||
3d7d929a | 1746 | static int lxc_setup_dev_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1747 | const struct lxc_terminal *console) |
6e590161 | 1748 | { |
882671aa | 1749 | int ret; |
6b5a54cd | 1750 | char path[PATH_MAX]; |
86530b0a | 1751 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
52e35957 | 1752 | |
8b1b1210 CB |
1753 | if (console->path && !strcmp(console->path, "none")) |
1754 | return 0; | |
1755 | ||
86530b0a | 1756 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3d7d929a | 1757 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1758 | return -1; |
52e35957 | 1759 | |
8b1b1210 CB |
1760 | /* When we are asked to setup a console we remove any previous |
1761 | * /dev/console bind-mounts. | |
1762 | */ | |
a7ba3c7f CB |
1763 | if (file_exists(path)) { |
1764 | ret = lxc_unstack_mountpoint(path, false); | |
1765 | if (ret < 0) { | |
6d1400b5 | 1766 | SYSERROR("Failed to unmount \"%s\"", path); |
a7ba3c7f CB |
1767 | return -ret; |
1768 | } else { | |
86530b0a | 1769 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1770 | } |
8b1b1210 CB |
1771 | } |
1772 | ||
1773 | /* For unprivileged containers autodev or automounts will already have | |
1774 | * taken care of creating /dev/console. | |
1775 | */ | |
882671aa | 1776 | ret = mknod(path, S_IFREG | 0000, 0); |
3b7e332f CB |
1777 | if (ret < 0 && errno != EEXIST) { |
1778 | SYSERROR("Failed to create console"); | |
1779 | return -errno; | |
52e35957 DL |
1780 | } |
1781 | ||
e581b9b5 | 1782 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP); |
86530b0a | 1783 | if (ret < 0) { |
0fd73091 | 1784 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
e581b9b5 | 1785 | S_IXUSR | S_IXGRP, console->name); |
3d7d929a | 1786 | return -errno; |
63376d7d | 1787 | } |
13954cce | 1788 | |
86530b0a L |
1789 | ret = safe_mount(console->name, path, "none", MS_BIND, 0, rootfs_path); |
1790 | if (ret < 0) { | |
0fd73091 | 1791 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, path); |
6e590161 | 1792 | return -1; |
1793 | } | |
1794 | ||
86530b0a | 1795 | DEBUG("Mounted pts device \"%s\" onto \"%s\"", console->name, path); |
7c6ef2a2 SH |
1796 | return 0; |
1797 | } | |
1798 | ||
3d7d929a | 1799 | static int lxc_setup_ttydir_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1800 | const struct lxc_terminal *console, |
3d7d929a | 1801 | char *ttydir) |
7c6ef2a2 | 1802 | { |
3b7e332f | 1803 | int ret; |
6b5a54cd | 1804 | char path[PATH_MAX], lxcpath[PATH_MAX]; |
86530b0a | 1805 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
7c6ef2a2 | 1806 | |
3dc035f1 L |
1807 | if (console->path && !strcmp(console->path, "none")) |
1808 | return 0; | |
1809 | ||
7c6ef2a2 | 1810 | /* create rootfs/dev/<ttydir> directory */ |
86530b0a | 1811 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs_path, ttydir); |
3d7d929a | 1812 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1813 | return -1; |
3d7d929a | 1814 | |
7c6ef2a2 SH |
1815 | ret = mkdir(path, 0755); |
1816 | if (ret && errno != EEXIST) { | |
0fd73091 | 1817 | SYSERROR("Failed to create \"%s\"", path); |
3d7d929a | 1818 | return -errno; |
7c6ef2a2 | 1819 | } |
4742cd9a | 1820 | DEBUG("Created directory for console and tty devices at \"%s\"", path); |
7c6ef2a2 | 1821 | |
86530b0a | 1822 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", rootfs_path, ttydir); |
3d7d929a CB |
1823 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
1824 | return -1; | |
1825 | ||
3b7e332f CB |
1826 | ret = mknod(lxcpath, S_IFREG | 0000, 0); |
1827 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1828 | SYSERROR("Failed to create \"%s\"", lxcpath); |
3d7d929a | 1829 | return -errno; |
7c6ef2a2 | 1830 | } |
7c6ef2a2 | 1831 | |
86530b0a | 1832 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3dc035f1 | 1833 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1834 | return -1; |
2a12fefd | 1835 | |
3dc035f1 | 1836 | if (file_exists(path)) { |
a7ba3c7f | 1837 | ret = lxc_unstack_mountpoint(path, false); |
2a12fefd | 1838 | if (ret < 0) { |
6d1400b5 | 1839 | SYSERROR("Failed to unmount \"%s\"", path); |
a7ba3c7f CB |
1840 | return -ret; |
1841 | } else { | |
86530b0a | 1842 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1843 | } |
3dc035f1 | 1844 | } |
2a12fefd | 1845 | |
3b7e332f CB |
1846 | ret = mknod(path, S_IFREG | 0000, 0); |
1847 | if (ret < 0 && errno != EEXIST) { | |
1848 | SYSERROR("Failed to create console"); | |
1849 | return -errno; | |
7c6ef2a2 SH |
1850 | } |
1851 | ||
e581b9b5 | 1852 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP); |
86530b0a | 1853 | if (ret < 0) { |
0fd73091 | 1854 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
e581b9b5 | 1855 | S_IXUSR | S_IXGRP, console->name); |
2a12fefd CB |
1856 | return -errno; |
1857 | } | |
1858 | ||
3dc035f1 | 1859 | /* bind mount console->name to '/dev/<ttydir>/console' */ |
86530b0a L |
1860 | ret = safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs_path); |
1861 | if (ret < 0) { | |
0fd73091 | 1862 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
7c6ef2a2 SH |
1863 | return -1; |
1864 | } | |
86530b0a | 1865 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1866 | |
1867 | /* bind mount '/dev/<ttydir>/console' to '/dev/console' */ | |
86530b0a L |
1868 | ret = safe_mount(lxcpath, path, "none", MS_BIND, 0, rootfs_path); |
1869 | if (ret < 0) { | |
0fd73091 | 1870 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1871 | return -1; |
1872 | } | |
86530b0a | 1873 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 | 1874 | |
86530b0a | 1875 | DEBUG("Console has been setup under \"%s\" and mounted to \"%s\"", lxcpath, path); |
6e590161 | 1876 | return 0; |
1877 | } | |
1878 | ||
3d7d929a | 1879 | static int lxc_setup_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1880 | const struct lxc_terminal *console, char *ttydir) |
7c6ef2a2 | 1881 | { |
3d7d929a | 1882 | |
7c6ef2a2 | 1883 | if (!ttydir) |
3d7d929a | 1884 | return lxc_setup_dev_console(rootfs, console); |
7c6ef2a2 | 1885 | |
3d7d929a | 1886 | return lxc_setup_ttydir_console(rootfs, console, ttydir); |
7c6ef2a2 SH |
1887 | } |
1888 | ||
efed99a4 | 1889 | static void parse_mntopt(char *opt, unsigned long *flags, char **data, size_t size) |
998ac676 RT |
1890 | { |
1891 | struct mount_opt *mo; | |
1892 | ||
1893 | /* If opt is found in mount_opt, set or clear flags. | |
1894 | * Otherwise append it to data. */ | |
1895 | ||
1896 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
0fd73091 | 1897 | if (strncmp(opt, mo->name, strlen(mo->name)) == 0) { |
998ac676 RT |
1898 | if (mo->clear) |
1899 | *flags &= ~mo->flag; | |
1900 | else | |
1901 | *flags |= mo->flag; | |
1902 | return; | |
1903 | } | |
1904 | } | |
1905 | ||
f1e05b90 DJ |
1906 | if (strlen(*data)) |
1907 | (void)strlcat(*data, ",", size); | |
efed99a4 | 1908 | |
f1e05b90 | 1909 | (void)strlcat(*data, opt, size); |
998ac676 RT |
1910 | } |
1911 | ||
0fd73091 | 1912 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, char **mntdata) |
998ac676 | 1913 | { |
0fd73091 | 1914 | char *data, *p, *s; |
efed99a4 | 1915 | size_t size; |
998ac676 | 1916 | |
911324ef | 1917 | *mntdata = NULL; |
91656ce5 | 1918 | *mntflags = 0L; |
911324ef DL |
1919 | |
1920 | if (!mntopts) | |
998ac676 RT |
1921 | return 0; |
1922 | ||
911324ef | 1923 | s = strdup(mntopts); |
0fd73091 | 1924 | if (!s) |
998ac676 | 1925 | return -1; |
998ac676 | 1926 | |
efed99a4 DJ |
1927 | size = strlen(s) + 1; |
1928 | data = malloc(size); | |
998ac676 | 1929 | if (!data) { |
998ac676 RT |
1930 | free(s); |
1931 | return -1; | |
1932 | } | |
1933 | *data = 0; | |
1934 | ||
8db9d26f | 1935 | lxc_iterate_parts(p, s, ",") |
efed99a4 | 1936 | parse_mntopt(p, mntflags, &data, size); |
998ac676 RT |
1937 | |
1938 | if (*data) | |
1939 | *mntdata = data; | |
1940 | else | |
1941 | free(data); | |
1942 | free(s); | |
1943 | ||
1944 | return 0; | |
1945 | } | |
1946 | ||
d840039e YT |
1947 | static void parse_propagationopt(char *opt, unsigned long *flags) |
1948 | { | |
1949 | struct mount_opt *mo; | |
1950 | ||
1951 | /* If opt is found in propagation_opt, set or clear flags. */ | |
d840039e | 1952 | for (mo = &propagation_opt[0]; mo->name != NULL; mo++) { |
0fd73091 CB |
1953 | if (strncmp(opt, mo->name, strlen(mo->name)) != 0) |
1954 | continue; | |
1955 | ||
1956 | if (mo->clear) | |
1957 | *flags &= ~mo->flag; | |
1958 | else | |
1959 | *flags |= mo->flag; | |
1960 | ||
1961 | return; | |
d840039e YT |
1962 | } |
1963 | } | |
1964 | ||
8ce1abc2 | 1965 | int parse_propagationopts(const char *mntopts, unsigned long *pflags) |
d840039e | 1966 | { |
0fd73091 | 1967 | char *p, *s; |
d840039e YT |
1968 | |
1969 | if (!mntopts) | |
1970 | return 0; | |
1971 | ||
1972 | s = strdup(mntopts); | |
1973 | if (!s) { | |
1974 | SYSERROR("Failed to allocate memory"); | |
1975 | return -ENOMEM; | |
1976 | } | |
1977 | ||
0fd73091 | 1978 | *pflags = 0L; |
8db9d26f | 1979 | lxc_iterate_parts(p, s, ",") |
d840039e | 1980 | parse_propagationopt(p, pflags); |
d840039e | 1981 | free(s); |
0fd73091 | 1982 | |
d840039e YT |
1983 | return 0; |
1984 | } | |
1985 | ||
6fd5e769 SH |
1986 | static void null_endofword(char *word) |
1987 | { | |
1988 | while (*word && *word != ' ' && *word != '\t') | |
1989 | word++; | |
1990 | *word = '\0'; | |
1991 | } | |
1992 | ||
0fd73091 | 1993 | /* skip @nfields spaces in @src */ |
6fd5e769 SH |
1994 | static char *get_field(char *src, int nfields) |
1995 | { | |
6fd5e769 | 1996 | int i; |
0fd73091 | 1997 | char *p = src; |
6fd5e769 SH |
1998 | |
1999 | for (i = 0; i < nfields; i++) { | |
2000 | while (*p && *p != ' ' && *p != '\t') | |
2001 | p++; | |
0fd73091 | 2002 | |
6fd5e769 SH |
2003 | if (!*p) |
2004 | break; | |
0fd73091 | 2005 | |
6fd5e769 SH |
2006 | p++; |
2007 | } | |
0fd73091 | 2008 | |
6fd5e769 SH |
2009 | return p; |
2010 | } | |
2011 | ||
911324ef DL |
2012 | static int mount_entry(const char *fsname, const char *target, |
2013 | const char *fstype, unsigned long mountflags, | |
d840039e YT |
2014 | unsigned long pflags, const char *data, bool optional, |
2015 | bool dev, bool relative, const char *rootfs) | |
911324ef | 2016 | { |
0ac4b28a | 2017 | int ret; |
6b5a54cd | 2018 | char srcbuf[PATH_MAX]; |
181437fd | 2019 | const char *srcpath = fsname; |
614305f3 | 2020 | #ifdef HAVE_STATVFS |
2938f7c8 | 2021 | struct statvfs sb; |
614305f3 | 2022 | #endif |
2938f7c8 | 2023 | |
181437fd | 2024 | if (relative) { |
6b5a54cd CB |
2025 | ret = snprintf(srcbuf, PATH_MAX, "%s/%s", rootfs ? rootfs : "/", fsname ? fsname : ""); |
2026 | if (ret < 0 || ret >= PATH_MAX) { | |
181437fd YT |
2027 | ERROR("source path is too long"); |
2028 | return -1; | |
2029 | } | |
2030 | srcpath = srcbuf; | |
2031 | } | |
2032 | ||
2033 | ret = safe_mount(srcpath, target, fstype, mountflags & ~MS_REMOUNT, data, | |
0ac4b28a CB |
2034 | rootfs); |
2035 | if (ret < 0) { | |
1fc64d22 | 2036 | if (optional) { |
7874d81a | 2037 | SYSINFO("Failed to mount \"%s\" on \"%s\" (optional)", |
2038 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
2039 | return 0; |
2040 | } | |
0ac4b28a | 2041 | |
0103eb53 | 2042 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2043 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2044 | return -1; |
911324ef DL |
2045 | } |
2046 | ||
2047 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
7c5b6e7c | 2048 | unsigned long rqd_flags = 0; |
0ac4b28a CB |
2049 | |
2050 | DEBUG("Remounting \"%s\" on \"%s\" to respect bind or remount " | |
181437fd | 2051 | "options", srcpath ? srcpath : "(none)", target ? target : "(none)"); |
0ac4b28a | 2052 | |
7c5b6e7c AS |
2053 | if (mountflags & MS_RDONLY) |
2054 | rqd_flags |= MS_RDONLY; | |
614305f3 | 2055 | #ifdef HAVE_STATVFS |
181437fd | 2056 | if (srcpath && statvfs(srcpath, &sb) == 0) { |
7c5b6e7c | 2057 | unsigned long required_flags = rqd_flags; |
0ac4b28a | 2058 | |
2938f7c8 SH |
2059 | if (sb.f_flag & MS_NOSUID) |
2060 | required_flags |= MS_NOSUID; | |
0ac4b28a | 2061 | |
ae7a770e | 2062 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 | 2063 | required_flags |= MS_NODEV; |
0ac4b28a | 2064 | |
2938f7c8 SH |
2065 | if (sb.f_flag & MS_RDONLY) |
2066 | required_flags |= MS_RDONLY; | |
0ac4b28a | 2067 | |
2938f7c8 SH |
2068 | if (sb.f_flag & MS_NOEXEC) |
2069 | required_flags |= MS_NOEXEC; | |
0ac4b28a CB |
2070 | |
2071 | DEBUG("Flags for \"%s\" were %lu, required extra flags " | |
181437fd | 2072 | "are %lu", srcpath, sb.f_flag, required_flags); |
0ac4b28a CB |
2073 | |
2074 | /* If this was a bind mount request, and required_flags | |
2938f7c8 | 2075 | * does not have any flags which are not already in |
0ac4b28a | 2076 | * mountflags, then skip the remount. |
2938f7c8 SH |
2077 | */ |
2078 | if (!(mountflags & MS_REMOUNT)) { | |
0ac4b28a CB |
2079 | if (!(required_flags & ~mountflags) && |
2080 | rqd_flags == 0) { | |
2081 | DEBUG("Mountflags already were %lu, " | |
2082 | "skipping remount", mountflags); | |
2938f7c8 SH |
2083 | goto skipremount; |
2084 | } | |
2085 | } | |
0ac4b28a | 2086 | |
2938f7c8 | 2087 | mountflags |= required_flags; |
6fd5e769 | 2088 | } |
614305f3 | 2089 | #endif |
911324ef | 2090 | |
181437fd | 2091 | ret = mount(srcpath, target, fstype, mountflags | MS_REMOUNT, data); |
0ac4b28a | 2092 | if (ret < 0) { |
1fc64d22 | 2093 | if (optional) { |
7874d81a | 2094 | SYSINFO("Failed to mount \"%s\" on \"%s\" (optional)", |
2095 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
2096 | return 0; |
2097 | } | |
0ac4b28a | 2098 | |
0103eb53 | 2099 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2100 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2101 | return -1; |
911324ef DL |
2102 | } |
2103 | } | |
2104 | ||
d840039e YT |
2105 | if (pflags) { |
2106 | ret = mount(NULL, target, NULL, pflags, NULL); | |
2107 | if (ret < 0) { | |
2108 | if (optional) { | |
7874d81a | 2109 | SYSINFO("Failed to change mount propagation " |
2110 | "for \"%s\" (optional)", target); | |
d840039e YT |
2111 | return 0; |
2112 | } else { | |
2113 | SYSERROR("Failed to change mount propagation " | |
2114 | "for \"%s\" (optional)", target); | |
2115 | return -1; | |
2116 | } | |
2117 | } | |
2118 | DEBUG("Changed mount propagation for \"%s\"", target); | |
2119 | } | |
2120 | ||
2121 | ||
614305f3 | 2122 | #ifdef HAVE_STATVFS |
6fd5e769 | 2123 | skipremount: |
614305f3 | 2124 | #endif |
0103eb53 | 2125 | DEBUG("Mounted \"%s\" on \"%s\" with filesystem type \"%s\"", |
181437fd | 2126 | srcpath ? srcpath : "(null)", target, fstype); |
911324ef DL |
2127 | |
2128 | return 0; | |
2129 | } | |
2130 | ||
c5e30de4 | 2131 | /* Remove "optional", "create=dir", and "create=file" from mntopt */ |
4e4ca161 SH |
2132 | static void cull_mntent_opt(struct mntent *mntent) |
2133 | { | |
2134 | int i; | |
0fd73091 CB |
2135 | char *list[] = { |
2136 | "create=dir", | |
2137 | "create=file", | |
2138 | "optional", | |
2139 | "relative", | |
2140 | NULL | |
2141 | }; | |
c5e30de4 CB |
2142 | |
2143 | for (i = 0; list[i]; i++) { | |
2144 | char *p, *p2; | |
2145 | ||
2146 | p = strstr(mntent->mnt_opts, list[i]); | |
2147 | if (!p) | |
4e4ca161 | 2148 | continue; |
c5e30de4 | 2149 | |
4e4ca161 SH |
2150 | p2 = strchr(p, ','); |
2151 | if (!p2) { | |
2152 | /* no more mntopts, so just chop it here */ | |
2153 | *p = '\0'; | |
2154 | continue; | |
2155 | } | |
c5e30de4 CB |
2156 | |
2157 | memmove(p, p2 + 1, strlen(p2 + 1) + 1); | |
4e4ca161 SH |
2158 | } |
2159 | } | |
2160 | ||
4d5b72a1 | 2161 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
749f98d9 CB |
2162 | const char *path, |
2163 | const struct lxc_rootfs *rootfs, | |
0fd73091 | 2164 | const char *lxc_name, const char *lxc_path) |
0ad19a3f | 2165 | { |
3b7e332f | 2166 | int ret; |
12e6ab5d | 2167 | char *p1, *p2; |
911324ef | 2168 | |
12e6ab5d | 2169 | if (strncmp(mntent->mnt_type, "overlay", 7) == 0) { |
749f98d9 | 2170 | ret = ovl_mkdir(mntent, rootfs, lxc_name, lxc_path); |
12e6ab5d CB |
2171 | if (ret < 0) |
2172 | return -1; | |
2173 | } | |
6e46cc0d | 2174 | |
34cfffb3 | 2175 | if (hasmntopt(mntent, "create=dir")) { |
749f98d9 CB |
2176 | ret = mkdir_p(path, 0755); |
2177 | if (ret < 0 && errno != EEXIST) { | |
2178 | SYSERROR("Failed to create directory \"%s\"", path); | |
2179 | return -1; | |
34cfffb3 SG |
2180 | } |
2181 | } | |
2182 | ||
0fd73091 CB |
2183 | if (!hasmntopt(mntent, "create=file")) |
2184 | return 0; | |
749f98d9 | 2185 | |
0fd73091 CB |
2186 | ret = access(path, F_OK); |
2187 | if (ret == 0) | |
2188 | return 0; | |
749f98d9 | 2189 | |
0fd73091 CB |
2190 | p1 = strdup(path); |
2191 | if (!p1) | |
2192 | return -1; | |
749f98d9 | 2193 | |
0fd73091 | 2194 | p2 = dirname(p1); |
749f98d9 | 2195 | |
0fd73091 CB |
2196 | ret = mkdir_p(p2, 0755); |
2197 | free(p1); | |
2198 | if (ret < 0 && errno != EEXIST) { | |
2199 | SYSERROR("Failed to create directory \"%s\"", path); | |
2200 | return -1; | |
34cfffb3 | 2201 | } |
749f98d9 | 2202 | |
3b7e332f CB |
2203 | ret = mknod(path, S_IFREG | 0000, 0); |
2204 | if (ret < 0 && errno != EEXIST) | |
2205 | return -errno; | |
0fd73091 | 2206 | |
749f98d9 | 2207 | return 0; |
4d5b72a1 NC |
2208 | } |
2209 | ||
ec50007f CB |
2210 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
2211 | * without a rootfs. */ | |
db4aba38 | 2212 | static inline int mount_entry_on_generic(struct mntent *mntent, |
d8b712bc CB |
2213 | const char *path, |
2214 | const struct lxc_rootfs *rootfs, | |
2215 | const char *lxc_name, | |
2216 | const char *lxc_path) | |
4d5b72a1 | 2217 | { |
d8b712bc | 2218 | int ret; |
949d0338 | 2219 | unsigned long mntflags; |
4d5b72a1 | 2220 | char *mntdata; |
181437fd | 2221 | bool dev, optional, relative; |
949d0338 | 2222 | unsigned long pflags = 0; |
ec50007f | 2223 | char *rootfs_path = NULL; |
d8b712bc CB |
2224 | |
2225 | optional = hasmntopt(mntent, "optional") != NULL; | |
2226 | dev = hasmntopt(mntent, "dev") != NULL; | |
181437fd | 2227 | relative = hasmntopt(mntent, "relative") != NULL; |
d8b712bc | 2228 | |
ec50007f CB |
2229 | if (rootfs && rootfs->path) |
2230 | rootfs_path = rootfs->mount; | |
2231 | ||
d8b712bc CB |
2232 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, |
2233 | lxc_path); | |
2234 | if (ret < 0) { | |
2235 | if (optional) | |
2236 | return 0; | |
608e3567 | 2237 | |
d8b712bc CB |
2238 | return -1; |
2239 | } | |
4e4ca161 SH |
2240 | cull_mntent_opt(mntent); |
2241 | ||
d840039e YT |
2242 | ret = parse_propagationopts(mntent->mnt_opts, &pflags); |
2243 | if (ret < 0) | |
2244 | return -1; | |
2245 | ||
d8b712bc CB |
2246 | ret = parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata); |
2247 | if (ret < 0) | |
a17b1e65 | 2248 | return -1; |
a17b1e65 | 2249 | |
6e46cc0d | 2250 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
d840039e | 2251 | pflags, mntdata, optional, dev, relative, rootfs_path); |
68c152ef | 2252 | |
911324ef | 2253 | free(mntdata); |
911324ef DL |
2254 | return ret; |
2255 | } | |
2256 | ||
db4aba38 NC |
2257 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
2258 | { | |
1433c9f9 | 2259 | int ret; |
6b5a54cd | 2260 | char path[PATH_MAX]; |
1433c9f9 CB |
2261 | |
2262 | /* For containers created without a rootfs all mounts are treated as | |
07667a6a CB |
2263 | * absolute paths starting at / on the host. |
2264 | */ | |
1433c9f9 CB |
2265 | if (mntent->mnt_dir[0] != '/') |
2266 | ret = snprintf(path, sizeof(path), "/%s", mntent->mnt_dir); | |
2267 | else | |
2268 | ret = snprintf(path, sizeof(path), "%s", mntent->mnt_dir); | |
07667a6a | 2269 | if (ret < 0 || ret >= sizeof(path)) |
1433c9f9 | 2270 | return -1; |
1433c9f9 CB |
2271 | |
2272 | return mount_entry_on_generic(mntent, path, NULL, NULL, NULL); | |
db4aba38 NC |
2273 | } |
2274 | ||
4e4ca161 | 2275 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 | 2276 | const struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2277 | const char *lxc_name, |
2278 | const char *lxc_path) | |
911324ef | 2279 | { |
bdd2b34c | 2280 | int offset; |
013bd428 | 2281 | char *aux; |
67e571de | 2282 | const char *lxcpath; |
6b5a54cd | 2283 | char path[PATH_MAX]; |
bdd2b34c | 2284 | int ret = 0; |
0ad19a3f | 2285 | |
593e8478 | 2286 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
bdd2b34c | 2287 | if (!lxcpath) |
2a59a681 | 2288 | return -1; |
2a59a681 | 2289 | |
bdd2b34c CB |
2290 | /* If rootfs->path is a blockdev path, allow container fstab to use |
2291 | * <lxcpath>/<name>/rootfs" as the target prefix. | |
2292 | */ | |
6b5a54cd CB |
2293 | ret = snprintf(path, PATH_MAX, "%s/%s/rootfs", lxcpath, lxc_name); |
2294 | if (ret < 0 || ret >= PATH_MAX) | |
80a881b2 SH |
2295 | goto skipvarlib; |
2296 | ||
2297 | aux = strstr(mntent->mnt_dir, path); | |
2298 | if (aux) { | |
2299 | offset = strlen(path); | |
2300 | goto skipabs; | |
2301 | } | |
2302 | ||
2303 | skipvarlib: | |
013bd428 DL |
2304 | aux = strstr(mntent->mnt_dir, rootfs->path); |
2305 | if (!aux) { | |
bdd2b34c | 2306 | WARN("Ignoring mount point \"%s\"", mntent->mnt_dir); |
db4aba38 | 2307 | return ret; |
013bd428 | 2308 | } |
80a881b2 SH |
2309 | offset = strlen(rootfs->path); |
2310 | ||
2311 | skipabs: | |
6b5a54cd CB |
2312 | ret = snprintf(path, PATH_MAX, "%s/%s", rootfs->mount, aux + offset); |
2313 | if (ret < 0 || ret >= PATH_MAX) | |
a17b1e65 | 2314 | return -1; |
a17b1e65 | 2315 | |
0a2dddd4 | 2316 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef | 2317 | } |
d330fe7b | 2318 | |
4e4ca161 | 2319 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
0a2dddd4 CB |
2320 | const struct lxc_rootfs *rootfs, |
2321 | const char *lxc_name, | |
2322 | const char *lxc_path) | |
911324ef | 2323 | { |
911324ef | 2324 | int ret; |
6b5a54cd | 2325 | char path[PATH_MAX]; |
d330fe7b | 2326 | |
34cfffb3 | 2327 | /* relative to root mount point */ |
6e46cc0d | 2328 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs->mount, mntent->mnt_dir); |
0fd73091 | 2329 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
9ba8130c | 2330 | return -1; |
911324ef | 2331 | |
0a2dddd4 | 2332 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef DL |
2333 | } |
2334 | ||
06749971 CB |
2335 | static int mount_file_entries(const struct lxc_conf *conf, |
2336 | const struct lxc_rootfs *rootfs, FILE *file, | |
1ae3c19f | 2337 | const char *lxc_name, const char *lxc_path) |
911324ef | 2338 | { |
aaf901be | 2339 | char buf[4096]; |
0fd73091 | 2340 | struct mntent mntent; |
911324ef | 2341 | int ret = -1; |
e76b8764 | 2342 | |
aaf901be | 2343 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
1ae3c19f CB |
2344 | if (!rootfs->path) |
2345 | ret = mount_entry_on_systemfs(&mntent); | |
2346 | else if (mntent.mnt_dir[0] != '/') | |
2347 | ret = mount_entry_on_relative_rootfs(&mntent, rootfs, | |
2348 | lxc_name, lxc_path); | |
2349 | else | |
2350 | ret = mount_entry_on_absolute_rootfs(&mntent, rootfs, | |
2351 | lxc_name, lxc_path); | |
2352 | if (ret < 0) | |
2353 | return -1; | |
0ad19a3f | 2354 | } |
2355 | ret = 0; | |
cd54d859 | 2356 | |
0fd73091 | 2357 | INFO("Finished setting up mounts"); |
e7938e9e MN |
2358 | return ret; |
2359 | } | |
2360 | ||
06749971 CB |
2361 | static int setup_mount(const struct lxc_conf *conf, |
2362 | const struct lxc_rootfs *rootfs, const char *fstab, | |
42dff448 | 2363 | const char *lxc_name, const char *lxc_path) |
e7938e9e | 2364 | { |
42dff448 | 2365 | FILE *f; |
e7938e9e MN |
2366 | int ret; |
2367 | ||
2368 | if (!fstab) | |
2369 | return 0; | |
2370 | ||
42dff448 CB |
2371 | f = setmntent(fstab, "r"); |
2372 | if (!f) { | |
2373 | SYSERROR("Failed to open \"%s\"", fstab); | |
e7938e9e MN |
2374 | return -1; |
2375 | } | |
2376 | ||
06749971 | 2377 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
42dff448 CB |
2378 | if (ret < 0) |
2379 | ERROR("Failed to set up mount entries"); | |
e7938e9e | 2380 | |
42dff448 | 2381 | endmntent(f); |
0ad19a3f | 2382 | return ret; |
2383 | } | |
2384 | ||
1800f924 WB |
2385 | /* |
2386 | * In order for nested containers to be able to mount /proc and /sys they need | |
2387 | * to see a "pure" proc and sysfs mount points with nothing mounted on top | |
2388 | * (like lxcfs). | |
2389 | * For this we provide proc and sysfs in /dev/.lxc/{proc,sys} while using an | |
2390 | * apparmor rule to deny access to them. This is mostly for convenience: The | |
2391 | * container's root user can mount them anyway and thus has access to the two | |
2392 | * file systems. But a non-root user in the container should not be allowed to | |
2393 | * access them as a side effect without explicitly allowing it. | |
2394 | */ | |
2395 | static const char nesting_helpers[] = | |
2396 | "proc dev/.lxc/proc proc create=dir,optional\n" | |
6333c915 | 2397 | "sys dev/.lxc/sys sysfs create=dir,optional\n"; |
1800f924 WB |
2398 | |
2399 | FILE *make_anonymous_mount_file(struct lxc_list *mount, | |
2400 | bool include_nesting_helpers) | |
e7938e9e | 2401 | { |
5ef5c9a3 | 2402 | int ret; |
e7938e9e | 2403 | char *mount_entry; |
5ef5c9a3 | 2404 | struct lxc_list *iterator; |
5ef5c9a3 CB |
2405 | int fd = -1; |
2406 | ||
0fd73091 | 2407 | fd = memfd_create(".lxc_mount_file", MFD_CLOEXEC); |
5ef5c9a3 | 2408 | if (fd < 0) { |
a324e7eb CB |
2409 | char template[] = P_tmpdir "/.lxc_mount_file_XXXXXX"; |
2410 | ||
5ef5c9a3 CB |
2411 | if (errno != ENOSYS) |
2412 | return NULL; | |
a324e7eb CB |
2413 | |
2414 | fd = lxc_make_tmpfile(template, true); | |
0fd73091 CB |
2415 | if (fd < 0) { |
2416 | SYSERROR("Could not create temporary mount file"); | |
2417 | return NULL; | |
2418 | } | |
2419 | ||
6bd04140 | 2420 | TRACE("Created temporary mount file"); |
5ef5c9a3 | 2421 | } |
0fd73091 CB |
2422 | if (fd < 0) { |
2423 | SYSERROR("Could not create temporary mount file"); | |
9fc7f8c0 | 2424 | return NULL; |
e7938e9e MN |
2425 | } |
2426 | ||
0fd73091 CB |
2427 | lxc_list_for_each (iterator, mount) { |
2428 | size_t len; | |
2429 | ||
e7938e9e | 2430 | mount_entry = iterator->elem; |
0fd73091 | 2431 | len = strlen(mount_entry); |
5ef5c9a3 | 2432 | |
489f39be | 2433 | ret = lxc_write_nointr(fd, mount_entry, len); |
0fd73091 CB |
2434 | if (ret != len) |
2435 | goto on_error; | |
2436 | ||
489f39be | 2437 | ret = lxc_write_nointr(fd, "\n", 1); |
0fd73091 CB |
2438 | if (ret != 1) |
2439 | goto on_error; | |
e7938e9e MN |
2440 | } |
2441 | ||
1800f924 WB |
2442 | if (include_nesting_helpers) { |
2443 | ret = lxc_write_nointr(fd, nesting_helpers, | |
6333c915 CB |
2444 | STRARRAYLEN(nesting_helpers)); |
2445 | if (ret != STRARRAYLEN(nesting_helpers)) | |
1800f924 WB |
2446 | goto on_error; |
2447 | } | |
2448 | ||
0fd73091 CB |
2449 | ret = lseek(fd, 0, SEEK_SET); |
2450 | if (ret < 0) | |
2451 | goto on_error; | |
2452 | ||
2453 | return fdopen(fd, "r+"); | |
2454 | ||
2455 | on_error: | |
2456 | SYSERROR("Failed to write mount entry to temporary mount file"); | |
2457 | close(fd); | |
2458 | return NULL; | |
9fc7f8c0 TA |
2459 | } |
2460 | ||
06749971 CB |
2461 | static int setup_mount_entries(const struct lxc_conf *conf, |
2462 | const struct lxc_rootfs *rootfs, | |
5ef5c9a3 CB |
2463 | struct lxc_list *mount, const char *lxc_name, |
2464 | const char *lxc_path) | |
9fc7f8c0 | 2465 | { |
9fc7f8c0 | 2466 | int ret; |
0fd73091 | 2467 | FILE *f; |
9fc7f8c0 | 2468 | |
1800f924 | 2469 | f = make_anonymous_mount_file(mount, conf->lsm_aa_allow_nesting); |
19b5d755 | 2470 | if (!f) |
9fc7f8c0 | 2471 | return -1; |
e7938e9e | 2472 | |
06749971 | 2473 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
19b5d755 | 2474 | fclose(f); |
0fd73091 | 2475 | |
e7938e9e MN |
2476 | return ret; |
2477 | } | |
2478 | ||
bab88e68 CS |
2479 | static int parse_cap(const char *cap) |
2480 | { | |
84760c11 | 2481 | size_t i; |
2482 | int capid = -1; | |
0fd73091 CB |
2483 | size_t end = sizeof(caps_opt) / sizeof(caps_opt[0]); |
2484 | char *ptr = NULL; | |
bab88e68 | 2485 | |
0fd73091 | 2486 | if (strcmp(cap, "none") == 0) |
7035407c DE |
2487 | return -2; |
2488 | ||
8560cd36 | 2489 | for (i = 0; i < end; i++) { |
bab88e68 CS |
2490 | if (strcmp(cap, caps_opt[i].name)) |
2491 | continue; | |
2492 | ||
2493 | capid = caps_opt[i].value; | |
2494 | break; | |
2495 | } | |
2496 | ||
2497 | if (capid < 0) { | |
0fd73091 CB |
2498 | /* Try to see if it's numeric, so the user may specify |
2499 | * capabilities that the running kernel knows about but we | |
2500 | * don't | |
2501 | */ | |
bab88e68 CS |
2502 | errno = 0; |
2503 | capid = strtol(cap, &ptr, 10); | |
2504 | if (!ptr || *ptr != '\0' || errno != 0) | |
2505 | /* not a valid number */ | |
2506 | capid = -1; | |
2507 | else if (capid > lxc_caps_last_cap()) | |
2508 | /* we have a number but it's not a valid | |
2509 | * capability */ | |
2510 | capid = -1; | |
2511 | } | |
2512 | ||
2513 | return capid; | |
2514 | } | |
2515 | ||
0769b82a CS |
2516 | int in_caplist(int cap, struct lxc_list *caps) |
2517 | { | |
0769b82a | 2518 | int capid; |
0fd73091 | 2519 | struct lxc_list *iterator; |
0769b82a | 2520 | |
0fd73091 | 2521 | lxc_list_for_each (iterator, caps) { |
0769b82a CS |
2522 | capid = parse_cap(iterator->elem); |
2523 | if (capid == cap) | |
2524 | return 1; | |
2525 | } | |
2526 | ||
2527 | return 0; | |
2528 | } | |
2529 | ||
81810dd1 DL |
2530 | static int setup_caps(struct lxc_list *caps) |
2531 | { | |
bab88e68 | 2532 | int capid; |
0fd73091 CB |
2533 | char *drop_entry; |
2534 | struct lxc_list *iterator; | |
81810dd1 | 2535 | |
0fd73091 CB |
2536 | lxc_list_for_each (iterator, caps) { |
2537 | int ret; | |
81810dd1 DL |
2538 | |
2539 | drop_entry = iterator->elem; | |
2540 | ||
bab88e68 | 2541 | capid = parse_cap(drop_entry); |
0fd73091 | 2542 | if (capid < 0) { |
1e11be34 DL |
2543 | ERROR("unknown capability %s", drop_entry); |
2544 | return -1; | |
81810dd1 DL |
2545 | } |
2546 | ||
b81689a1 CB |
2547 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(capid), prctl_arg(0), |
2548 | prctl_arg(0), prctl_arg(0)); | |
0fd73091 CB |
2549 | if (ret < 0) { |
2550 | SYSERROR("Failed to remove %s capability", drop_entry); | |
3ec1648d SH |
2551 | return -1; |
2552 | } | |
0fd73091 | 2553 | DEBUG("Dropped %s (%d) capability", drop_entry, capid); |
81810dd1 DL |
2554 | } |
2555 | ||
0fd73091 | 2556 | DEBUG("Capabilities have been setup"); |
1fb86a7c SH |
2557 | return 0; |
2558 | } | |
2559 | ||
2560 | static int dropcaps_except(struct lxc_list *caps) | |
2561 | { | |
0fd73091 | 2562 | int i, capid, numcaps; |
1fb86a7c | 2563 | char *keep_entry; |
0fd73091 | 2564 | struct lxc_list *iterator; |
1fb86a7c | 2565 | |
0fd73091 | 2566 | numcaps = lxc_caps_last_cap() + 1; |
2caf9a97 SH |
2567 | if (numcaps <= 0 || numcaps > 200) |
2568 | return -1; | |
0fd73091 | 2569 | TRACE("Found %d capabilities", numcaps); |
2caf9a97 | 2570 | |
1a0e70ac | 2571 | /* caplist[i] is 1 if we keep capability i */ |
1fb86a7c SH |
2572 | int *caplist = alloca(numcaps * sizeof(int)); |
2573 | memset(caplist, 0, numcaps * sizeof(int)); | |
2574 | ||
0fd73091 | 2575 | lxc_list_for_each (iterator, caps) { |
1fb86a7c SH |
2576 | keep_entry = iterator->elem; |
2577 | ||
bab88e68 | 2578 | capid = parse_cap(keep_entry); |
7035407c DE |
2579 | if (capid == -2) |
2580 | continue; | |
2581 | ||
0fd73091 CB |
2582 | if (capid < 0) { |
2583 | ERROR("Unknown capability %s", keep_entry); | |
1fb86a7c SH |
2584 | return -1; |
2585 | } | |
2586 | ||
0fd73091 | 2587 | DEBUG("Keep capability %s (%d)", keep_entry, capid); |
1fb86a7c SH |
2588 | caplist[capid] = 1; |
2589 | } | |
0fd73091 CB |
2590 | |
2591 | for (i = 0; i < numcaps; i++) { | |
2592 | int ret; | |
2593 | ||
1fb86a7c SH |
2594 | if (caplist[i]) |
2595 | continue; | |
0fd73091 | 2596 | |
b81689a1 CB |
2597 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(i), prctl_arg(0), |
2598 | prctl_arg(0), prctl_arg(0)); | |
0fd73091 CB |
2599 | if (ret < 0) { |
2600 | SYSERROR("Failed to remove capability %d", i); | |
3ec1648d SH |
2601 | return -1; |
2602 | } | |
1fb86a7c SH |
2603 | } |
2604 | ||
0fd73091 | 2605 | DEBUG("Capabilities have been setup"); |
81810dd1 DL |
2606 | return 0; |
2607 | } | |
2608 | ||
0fd73091 CB |
2609 | static int parse_resource(const char *res) |
2610 | { | |
2611 | int ret; | |
c6d09e15 WB |
2612 | size_t i; |
2613 | int resid = -1; | |
2614 | ||
0fd73091 | 2615 | for (i = 0; i < sizeof(limit_opt) / sizeof(limit_opt[0]); ++i) |
c6d09e15 WB |
2616 | if (strcmp(res, limit_opt[i].name) == 0) |
2617 | return limit_opt[i].value; | |
c6d09e15 | 2618 | |
0fd73091 | 2619 | /* Try to see if it's numeric, so the user may specify |
c6d09e15 | 2620 | * resources that the running kernel knows about but |
0fd73091 CB |
2621 | * we don't. |
2622 | */ | |
2623 | ret = lxc_safe_int(res, &resid); | |
2624 | if (ret < 0) | |
2625 | return -1; | |
2626 | ||
2627 | return resid; | |
c6d09e15 WB |
2628 | } |
2629 | ||
0fd73091 CB |
2630 | int setup_resource_limits(struct lxc_list *limits, pid_t pid) |
2631 | { | |
2632 | int resid; | |
c6d09e15 WB |
2633 | struct lxc_list *it; |
2634 | struct lxc_limit *lim; | |
c6d09e15 | 2635 | |
0fd73091 | 2636 | lxc_list_for_each (it, limits) { |
c6d09e15 WB |
2637 | lim = it->elem; |
2638 | ||
2639 | resid = parse_resource(lim->resource); | |
2640 | if (resid < 0) { | |
0fd73091 | 2641 | ERROR("Unknown resource %s", lim->resource); |
c6d09e15 WB |
2642 | return -1; |
2643 | } | |
2644 | ||
f48b5fd8 | 2645 | #if HAVE_PRLIMIT || HAVE_PRLIMIT64 |
c6d09e15 | 2646 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) { |
6d1400b5 | 2647 | SYSERROR("Failed to set limit %s", lim->resource); |
c6d09e15 WB |
2648 | return -1; |
2649 | } | |
2de12765 CB |
2650 | |
2651 | TRACE("Setup \"%s\" limit", lim->resource); | |
f48b5fd8 | 2652 | #else |
2de12765 | 2653 | ERROR("Cannot set limit \"%s\" as prlimit is missing", lim->resource); |
f48b5fd8 FF |
2654 | return -1; |
2655 | #endif | |
c6d09e15 | 2656 | } |
0fd73091 | 2657 | |
c6d09e15 WB |
2658 | return 0; |
2659 | } | |
2660 | ||
7edd0540 L |
2661 | int setup_sysctl_parameters(struct lxc_list *sysctls) |
2662 | { | |
2663 | struct lxc_list *it; | |
2664 | struct lxc_sysctl *elem; | |
0fd73091 | 2665 | int ret = 0; |
7edd0540 | 2666 | char *tmp = NULL; |
6b5a54cd | 2667 | char filename[PATH_MAX] = {0}; |
7edd0540 | 2668 | |
0fd73091 | 2669 | lxc_list_for_each (it, sysctls) { |
7edd0540 L |
2670 | elem = it->elem; |
2671 | tmp = lxc_string_replace(".", "/", elem->key); | |
2672 | if (!tmp) { | |
2673 | ERROR("Failed to replace key %s", elem->key); | |
2674 | return -1; | |
2675 | } | |
2676 | ||
2677 | ret = snprintf(filename, sizeof(filename), "/proc/sys/%s", tmp); | |
2678 | free(tmp); | |
2679 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { | |
2680 | ERROR("Error setting up sysctl parameters path"); | |
2681 | return -1; | |
2682 | } | |
2683 | ||
0fd73091 | 2684 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2685 | strlen(elem->value), false, 0666); |
7edd0540 | 2686 | if (ret < 0) { |
0fd73091 CB |
2687 | ERROR("Failed to setup sysctl parameters %s to %s", |
2688 | elem->key, elem->value); | |
7edd0540 L |
2689 | return -1; |
2690 | } | |
2691 | } | |
0fd73091 | 2692 | |
7edd0540 L |
2693 | return 0; |
2694 | } | |
2695 | ||
61d7a733 YT |
2696 | int setup_proc_filesystem(struct lxc_list *procs, pid_t pid) |
2697 | { | |
2698 | struct lxc_list *it; | |
2699 | struct lxc_proc *elem; | |
0fd73091 | 2700 | int ret = 0; |
61d7a733 | 2701 | char *tmp = NULL; |
6b5a54cd | 2702 | char filename[PATH_MAX] = {0}; |
61d7a733 | 2703 | |
0fd73091 | 2704 | lxc_list_for_each (it, procs) { |
61d7a733 YT |
2705 | elem = it->elem; |
2706 | tmp = lxc_string_replace(".", "/", elem->filename); | |
2707 | if (!tmp) { | |
2708 | ERROR("Failed to replace key %s", elem->filename); | |
2709 | return -1; | |
2710 | } | |
2711 | ||
2712 | ret = snprintf(filename, sizeof(filename), "/proc/%d/%s", pid, tmp); | |
2713 | free(tmp); | |
2714 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { | |
2715 | ERROR("Error setting up proc filesystem path"); | |
2716 | return -1; | |
2717 | } | |
2718 | ||
0fd73091 | 2719 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2720 | strlen(elem->value), false, 0666); |
61d7a733 | 2721 | if (ret < 0) { |
0fd73091 CB |
2722 | ERROR("Failed to setup proc filesystem %s to %s", |
2723 | elem->filename, elem->value); | |
61d7a733 YT |
2724 | return -1; |
2725 | } | |
2726 | } | |
0fd73091 | 2727 | |
61d7a733 YT |
2728 | return 0; |
2729 | } | |
2730 | ||
ae9242c8 SH |
2731 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2732 | ||
7b379ab3 | 2733 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2734 | { |
26ddeedd | 2735 | int i; |
0fd73091 | 2736 | struct lxc_conf *new; |
7b379ab3 | 2737 | |
13277ec4 | 2738 | new = malloc(sizeof(*new)); |
0fd73091 | 2739 | if (!new) |
7b379ab3 | 2740 | return NULL; |
7b379ab3 MN |
2741 | memset(new, 0, sizeof(*new)); |
2742 | ||
4b73005c | 2743 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
cccc74b5 | 2744 | new->personality = -1; |
124fa0a8 | 2745 | new->autodev = 1; |
3a784510 | 2746 | new->console.buffer_size = 0; |
596a818d DE |
2747 | new->console.log_path = NULL; |
2748 | new->console.log_fd = -1; | |
861813e5 | 2749 | new->console.log_size = 0; |
28a4b0e5 | 2750 | new->console.path = NULL; |
63376d7d | 2751 | new->console.peer = -1; |
fb87aa6a CB |
2752 | new->console.proxy.busy = -1; |
2753 | new->console.proxy.master = -1; | |
2754 | new->console.proxy.slave = -1; | |
63376d7d DL |
2755 | new->console.master = -1; |
2756 | new->console.slave = -1; | |
2757 | new->console.name[0] = '\0'; | |
732375f5 | 2758 | memset(&new->console.ringbuf, 0, sizeof(struct lxc_ringbuf)); |
d2e30e99 | 2759 | new->maincmd_fd = -1; |
258f8051 | 2760 | new->monitor_signal_pdeath = SIGKILL; |
76a26f55 | 2761 | new->nbd_idx = -1; |
54c30e29 | 2762 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 2763 | if (!new->rootfs.mount) { |
53f3f048 SH |
2764 | free(new); |
2765 | return NULL; | |
2766 | } | |
6e54330c | 2767 | new->rootfs.managed = true; |
858377e4 | 2768 | new->logfd = -1; |
7b379ab3 | 2769 | lxc_list_init(&new->cgroup); |
54860ed0 | 2770 | lxc_list_init(&new->cgroup2); |
7b379ab3 MN |
2771 | lxc_list_init(&new->network); |
2772 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2773 | lxc_list_init(&new->caps); |
1fb86a7c | 2774 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2775 | lxc_list_init(&new->id_map); |
46ad64ab CB |
2776 | new->root_nsuid_map = NULL; |
2777 | new->root_nsgid_map = NULL; | |
f979ac15 | 2778 | lxc_list_init(&new->includes); |
4184c3e1 | 2779 | lxc_list_init(&new->aliens); |
7c661726 | 2780 | lxc_list_init(&new->environment); |
c6d09e15 | 2781 | lxc_list_init(&new->limits); |
7edd0540 | 2782 | lxc_list_init(&new->sysctls); |
61d7a733 | 2783 | lxc_list_init(&new->procs); |
44ae0fb6 | 2784 | new->hooks_version = 0; |
28d9e29e | 2785 | for (i = 0; i < NUM_LXC_HOOKS; i++) |
26ddeedd | 2786 | lxc_list_init(&new->hooks[i]); |
ee1e7aa0 | 2787 | lxc_list_init(&new->groups); |
d39b10eb | 2788 | lxc_list_init(&new->state_clients); |
fe4de9a6 | 2789 | new->lsm_aa_profile = NULL; |
1800f924 | 2790 | lxc_list_init(&new->lsm_aa_raw); |
fe4de9a6 | 2791 | new->lsm_se_context = NULL; |
7a0bcca3 | 2792 | new->tmp_umount_proc = false; |
7a41e857 LT |
2793 | new->tmp_umount_proc = 0; |
2794 | new->shmount.path_host = NULL; | |
2795 | new->shmount.path_cont = NULL; | |
7b379ab3 | 2796 | |
72bb04e4 PT |
2797 | /* if running in a new user namespace, init and COMMAND |
2798 | * default to running as UID/GID 0 when using lxc-execute */ | |
2799 | new->init_uid = 0; | |
2800 | new->init_gid = 0; | |
43654d34 | 2801 | memset(&new->cgroup_meta, 0, sizeof(struct lxc_cgroup)); |
b074bbf1 | 2802 | memset(&new->ns_share, 0, sizeof(char *) * LXC_NS_MAX); |
72bb04e4 | 2803 | |
7b379ab3 | 2804 | return new; |
089cd8b8 DL |
2805 | } |
2806 | ||
344c9d81 | 2807 | int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
a19b974f | 2808 | size_t buf_size) |
f6d3e3e4 | 2809 | { |
29053180 | 2810 | int fd, ret; |
6b5a54cd | 2811 | char path[PATH_MAX]; |
f6d3e3e4 | 2812 | |
a19b974f CB |
2813 | if (geteuid() != 0 && idtype == ID_TYPE_GID) { |
2814 | size_t buflen; | |
2815 | ||
6b5a54cd CB |
2816 | ret = snprintf(path, PATH_MAX, "/proc/%d/setgroups", pid); |
2817 | if (ret < 0 || ret >= PATH_MAX) | |
a19b974f | 2818 | return -E2BIG; |
a19b974f CB |
2819 | |
2820 | fd = open(path, O_WRONLY); | |
2821 | if (fd < 0 && errno != ENOENT) { | |
2822 | SYSERROR("Failed to open \"%s\"", path); | |
2823 | return -1; | |
2824 | } | |
2825 | ||
2388737b | 2826 | if (fd >= 0) { |
6333c915 | 2827 | buflen = STRLITERALLEN("deny\n"); |
2388737b CB |
2828 | errno = 0; |
2829 | ret = lxc_write_nointr(fd, "deny\n", buflen); | |
395b1a3e | 2830 | close(fd); |
2388737b | 2831 | if (ret != buflen) { |
0fd73091 CB |
2832 | SYSERROR("Failed to write \"deny\" to " |
2833 | "\"/proc/%d/setgroups\"", pid); | |
2388737b CB |
2834 | return -1; |
2835 | } | |
395b1a3e | 2836 | TRACE("Wrote \"deny\" to \"/proc/%d/setgroups\"", pid); |
a19b974f | 2837 | } |
a19b974f CB |
2838 | } |
2839 | ||
6b5a54cd | 2840 | ret = snprintf(path, PATH_MAX, "/proc/%d/%cid_map", pid, |
29053180 | 2841 | idtype == ID_TYPE_UID ? 'u' : 'g'); |
6b5a54cd | 2842 | if (ret < 0 || ret >= PATH_MAX) |
f6d3e3e4 | 2843 | return -E2BIG; |
29053180 CB |
2844 | |
2845 | fd = open(path, O_WRONLY); | |
2846 | if (fd < 0) { | |
a19b974f | 2847 | SYSERROR("Failed to open \"%s\"", path); |
29053180 | 2848 | return -1; |
f6d3e3e4 | 2849 | } |
29053180 CB |
2850 | |
2851 | errno = 0; | |
2852 | ret = lxc_write_nointr(fd, buf, buf_size); | |
395b1a3e | 2853 | close(fd); |
29053180 | 2854 | if (ret != buf_size) { |
a19b974f | 2855 | SYSERROR("Failed to write %cid mapping to \"%s\"", |
29053180 | 2856 | idtype == ID_TYPE_UID ? 'u' : 'g', path); |
29053180 CB |
2857 | return -1; |
2858 | } | |
29053180 CB |
2859 | |
2860 | return 0; | |
f6d3e3e4 SH |
2861 | } |
2862 | ||
6e50e704 CB |
2863 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
2864 | * | |
2865 | * @return 1 if functional binary was found | |
2866 | * @return 0 if binary exists but is lacking privilege | |
2867 | * @return -ENOENT if binary does not exist | |
2868 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
6e50e704 | 2869 | */ |
df6a2945 CB |
2870 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
2871 | { | |
2872 | char *path; | |
2873 | int ret; | |
2874 | struct stat st; | |
2875 | int fret = 0; | |
2876 | ||
6e50e704 CB |
2877 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
2878 | return -EINVAL; | |
2879 | ||
df6a2945 CB |
2880 | path = on_path(binary, NULL); |
2881 | if (!path) | |
2882 | return -ENOENT; | |
2883 | ||
2884 | ret = stat(path, &st); | |
2885 | if (ret < 0) { | |
2886 | fret = -errno; | |
2887 | goto cleanup; | |
2888 | } | |
2889 | ||
2890 | /* Check if the binary is setuid. */ | |
2891 | if (st.st_mode & S_ISUID) { | |
0fd73091 | 2892 | DEBUG("The binary \"%s\" does have the setuid bit set", path); |
df6a2945 CB |
2893 | fret = 1; |
2894 | goto cleanup; | |
2895 | } | |
2896 | ||
0fd73091 | 2897 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
2898 | /* Check if it has the CAP_SETUID capability. */ |
2899 | if ((cap & CAP_SETUID) && | |
2900 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
2901 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) { | |
2902 | DEBUG("The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE " | |
0fd73091 | 2903 | "and CAP_PERMITTED sets", path); |
df6a2945 CB |
2904 | fret = 1; |
2905 | goto cleanup; | |
2906 | } | |
2907 | ||
2908 | /* Check if it has the CAP_SETGID capability. */ | |
2909 | if ((cap & CAP_SETGID) && | |
2910 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
2911 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) { | |
2912 | DEBUG("The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE " | |
0fd73091 | 2913 | "and CAP_PERMITTED sets", path); |
df6a2945 CB |
2914 | fret = 1; |
2915 | goto cleanup; | |
2916 | } | |
0fd73091 | 2917 | #else |
69924fff CB |
2918 | /* If we cannot check for file capabilities we need to give the benefit |
2919 | * of the doubt. Otherwise we might fail even though all the necessary | |
2920 | * file capabilities are set. | |
2921 | */ | |
d6018f88 | 2922 | DEBUG("Cannot check for file capabilites as full capability support is " |
0fd73091 | 2923 | "missing. Manual intervention needed"); |
d6018f88 | 2924 | fret = 1; |
0fd73091 | 2925 | #endif |
df6a2945 CB |
2926 | |
2927 | cleanup: | |
2928 | free(path); | |
2929 | return fret; | |
2930 | } | |
2931 | ||
986ef930 CB |
2932 | int lxc_map_ids_exec_wrapper(void *args) |
2933 | { | |
2934 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
2935 | return -1; | |
2936 | } | |
2937 | ||
f6d3e3e4 SH |
2938 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) |
2939 | { | |
0fd73091 | 2940 | int fill, left; |
986ef930 | 2941 | char u_or_g; |
4bc3b759 | 2942 | char *pos; |
6b5a54cd | 2943 | char cmd_output[PATH_MAX]; |
0fd73091 CB |
2944 | struct id_map *map; |
2945 | struct lxc_list *iterator; | |
2946 | enum idtype type; | |
986ef930 CB |
2947 | /* strlen("new@idmap") = 9 |
2948 | * + | |
2949 | * strlen(" ") = 1 | |
2950 | * + | |
d33968ad | 2951 | * INTTYPE_TO_STRLEN(uint32_t) |
986ef930 CB |
2952 | * + |
2953 | * strlen(" ") = 1 | |
2954 | * | |
2955 | * We add some additional space to make sure that we really have | |
2956 | * LXC_IDMAPLEN bytes available for our the {g,u]id mapping. | |
2957 | */ | |
0fd73091 | 2958 | int ret = 0, gidmap = 0, uidmap = 0; |
d33968ad | 2959 | char mapbuf[9 + 1 + INTTYPE_TO_STRLEN(uint32_t) + 1 + LXC_IDMAPLEN] = {0}; |
0fd73091 | 2960 | bool had_entry = false, use_shadow = false; |
c724025c JC |
2961 | int hostuid, hostgid; |
2962 | ||
2963 | hostuid = geteuid(); | |
2964 | hostgid = getegid(); | |
df6a2945 CB |
2965 | |
2966 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid | |
2967 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
2968 | * will protected it by preventing another user from being handed the |
2969 | * range by shadow. | |
2970 | */ | |
df6a2945 | 2971 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
2972 | if (uidmap == -ENOENT) |
2973 | WARN("newuidmap binary is missing"); | |
2974 | else if (!uidmap) | |
2975 | WARN("newuidmap is lacking necessary privileges"); | |
2976 | ||
df6a2945 | 2977 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
2978 | if (gidmap == -ENOENT) |
2979 | WARN("newgidmap binary is missing"); | |
2980 | else if (!gidmap) | |
2981 | WARN("newgidmap is lacking necessary privileges"); | |
2982 | ||
df6a2945 | 2983 | if (uidmap > 0 && gidmap > 0) { |
0fd73091 | 2984 | DEBUG("Functional newuidmap and newgidmap binary found"); |
4bc3b759 | 2985 | use_shadow = true; |
df6a2945 | 2986 | } else { |
99d43365 CB |
2987 | /* In case unprivileged users run application containers via |
2988 | * execute() or a start*() there are valid cases where they may | |
2989 | * only want to map their own {g,u}id. Let's not block them from | |
2990 | * doing so by requiring geteuid() == 0. | |
2991 | */ | |
2992 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
c724025c JC |
2993 | "write directly with euid %d", hostuid); |
2994 | } | |
2995 | ||
2996 | /* Check if we really need to use newuidmap and newgidmap. | |
2997 | * If the user is only remapping his own {g,u}id, we don't need it. | |
2998 | */ | |
2999 | if (use_shadow && lxc_list_len(idmap) == 2) { | |
3000 | use_shadow = false; | |
3001 | lxc_list_for_each(iterator, idmap) { | |
3002 | map = iterator->elem; | |
3003 | if (map->idtype == ID_TYPE_UID && map->range == 1 && | |
3004 | map->nsid == hostuid && map->hostid == hostuid) | |
3005 | continue; | |
3006 | if (map->idtype == ID_TYPE_GID && map->range == 1 && | |
3007 | map->nsid == hostgid && map->hostid == hostgid) | |
3008 | continue; | |
3009 | use_shadow = true; | |
3010 | break; | |
3011 | } | |
0e6e3a41 | 3012 | } |
251d0d2a | 3013 | |
986ef930 CB |
3014 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
3015 | type++, u_or_g = 'g') { | |
3016 | pos = mapbuf; | |
3017 | ||
0e6e3a41 | 3018 | if (use_shadow) |
986ef930 | 3019 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 3020 | |
cf3ef16d | 3021 | lxc_list_for_each(iterator, idmap) { |
251d0d2a | 3022 | map = iterator->elem; |
cf3ef16d SH |
3023 | if (map->idtype != type) |
3024 | continue; | |
3025 | ||
4bc3b759 CB |
3026 | had_entry = true; |
3027 | ||
986ef930 | 3028 | left = LXC_IDMAPLEN - (pos - mapbuf); |
d1838f34 | 3029 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
3030 | use_shadow ? " " : "", map->nsid, |
3031 | map->hostid, map->range, | |
0e6e3a41 | 3032 | use_shadow ? "" : "\n"); |
a427e268 CB |
3033 | if (fill <= 0 || fill >= left) { |
3034 | /* The kernel only takes <= 4k for writes to | |
3035 | * /proc/<pid>/{g,u}id_map | |
3036 | */ | |
3037 | SYSERROR("Too many %cid mappings defined", u_or_g); | |
3038 | return -1; | |
3039 | } | |
4bc3b759 | 3040 | |
cf3ef16d | 3041 | pos += fill; |
251d0d2a | 3042 | } |
cf3ef16d | 3043 | if (!had_entry) |
4f7521b4 | 3044 | continue; |
cf3ef16d | 3045 | |
986ef930 CB |
3046 | /* Try to catch the ouput of new{g,u}idmap to make debugging |
3047 | * easier. | |
3048 | */ | |
3049 | if (use_shadow) { | |
3050 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3051 | lxc_map_ids_exec_wrapper, | |
3052 | (void *)mapbuf); | |
3053 | if (ret < 0) { | |
54fbbeb5 CB |
3054 | ERROR("new%cidmap failed to write mapping \"%s\": %s", |
3055 | u_or_g, cmd_output, mapbuf); | |
986ef930 CB |
3056 | return -1; |
3057 | } | |
54fbbeb5 | 3058 | TRACE("new%cidmap wrote mapping \"%s\"", u_or_g, mapbuf); |
d1838f34 | 3059 | } else { |
986ef930 | 3060 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
54fbbeb5 | 3061 | if (ret < 0) { |
da0f9977 | 3062 | ERROR("Failed to write mapping: %s", mapbuf); |
986ef930 | 3063 | return -1; |
54fbbeb5 CB |
3064 | } |
3065 | TRACE("Wrote mapping \"%s\"", mapbuf); | |
d1838f34 | 3066 | } |
986ef930 CB |
3067 | |
3068 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 3069 | } |
251d0d2a | 3070 | |
986ef930 | 3071 | return 0; |
f6d3e3e4 SH |
3072 | } |
3073 | ||
0fd73091 | 3074 | /* Return the host uid/gid to which the container root is mapped in val. |
0b3a6504 | 3075 | * Return true if id was found, false otherwise. |
cf3ef16d | 3076 | */ |
2a9a80cb | 3077 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
4160c3a0 | 3078 | unsigned long *val) |
cf3ef16d | 3079 | { |
4160c3a0 | 3080 | unsigned nsid; |
0fd73091 CB |
3081 | struct id_map *map; |
3082 | struct lxc_list *it; | |
4160c3a0 CB |
3083 | |
3084 | if (idtype == ID_TYPE_UID) | |
3085 | nsid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; | |
3086 | else | |
3087 | nsid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
cf3ef16d | 3088 | |
0fd73091 | 3089 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 3090 | map = it->elem; |
7b50c609 | 3091 | if (map->idtype != idtype) |
cf3ef16d | 3092 | continue; |
4160c3a0 | 3093 | if (map->nsid != nsid) |
cf3ef16d | 3094 | continue; |
2a9a80cb SH |
3095 | *val = map->hostid; |
3096 | return true; | |
cf3ef16d | 3097 | } |
4160c3a0 | 3098 | |
2a9a80cb | 3099 | return false; |
cf3ef16d SH |
3100 | } |
3101 | ||
2133f58c | 3102 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3103 | { |
cf3ef16d | 3104 | struct id_map *map; |
0fd73091 CB |
3105 | struct lxc_list *it; |
3106 | ||
3107 | lxc_list_for_each (it, &conf->id_map) { | |
cf3ef16d | 3108 | map = it->elem; |
2133f58c | 3109 | if (map->idtype != idtype) |
cf3ef16d | 3110 | continue; |
0fd73091 | 3111 | |
cf3ef16d | 3112 | if (id >= map->hostid && id < map->hostid + map->range) |
57d116ab | 3113 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 3114 | } |
0fd73091 | 3115 | |
57d116ab | 3116 | return -1; |
cf3ef16d SH |
3117 | } |
3118 | ||
339efad9 | 3119 | int find_unmapped_nsid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3120 | { |
cf3ef16d | 3121 | struct id_map *map; |
0fd73091 | 3122 | struct lxc_list *it; |
2133f58c | 3123 | unsigned int freeid = 0; |
0fd73091 | 3124 | |
cf3ef16d | 3125 | again: |
0fd73091 | 3126 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 3127 | map = it->elem; |
2133f58c | 3128 | if (map->idtype != idtype) |
cf3ef16d | 3129 | continue; |
0fd73091 | 3130 | |
cf3ef16d SH |
3131 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { |
3132 | freeid = map->nsid + map->range; | |
3133 | goto again; | |
3134 | } | |
3135 | } | |
0fd73091 | 3136 | |
cf3ef16d SH |
3137 | return freeid; |
3138 | } | |
3139 | ||
f4f52cb5 CB |
3140 | int chown_mapped_root_exec_wrapper(void *args) |
3141 | { | |
3142 | execvp("lxc-usernsexec", args); | |
3143 | return -1; | |
3144 | } | |
3145 | ||
0fd73091 | 3146 | /* chown_mapped_root: for an unprivileged user with uid/gid X to |
7b50c609 TS |
3147 | * chown a dir to subuid/subgid Y, he needs to run chown as root |
3148 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
3149 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
3150 | * root is privileged with respect to hostuid/hostgid X, allowing | |
3151 | * him to do the chown. | |
f6d3e3e4 | 3152 | */ |
41dc7155 | 3153 | int chown_mapped_root(const char *path, struct lxc_conf *conf) |
f6d3e3e4 | 3154 | { |
f4f52cb5 | 3155 | uid_t rootuid, rootgid; |
2a9a80cb | 3156 | unsigned long val; |
f4f52cb5 CB |
3157 | int hostuid, hostgid, ret; |
3158 | struct stat sb; | |
3159 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
3160 | char ugid[100]; | |
41dc7155 | 3161 | const char *args1[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3162 | "-m", map1, |
3163 | "-m", map2, | |
3164 | "-m", map3, | |
3165 | "-m", map5, | |
3166 | "--", "chown", ugid, path, | |
3167 | NULL}; | |
41dc7155 | 3168 | const char *args2[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3169 | "-m", map1, |
3170 | "-m", map2, | |
3171 | "-m", map3, | |
3172 | "-m", map4, | |
3173 | "-m", map5, | |
3174 | "--", "chown", ugid, path, | |
3175 | NULL}; | |
6b5a54cd | 3176 | char cmd_output[PATH_MAX]; |
f4f52cb5 CB |
3177 | |
3178 | hostuid = geteuid(); | |
3179 | hostgid = getegid(); | |
f6d3e3e4 | 3180 | |
2a9a80cb | 3181 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
bc80f098 | 3182 | ERROR("No uid mapping for container root"); |
c4d10a05 | 3183 | return -1; |
f6d3e3e4 | 3184 | } |
f4f52cb5 | 3185 | rootuid = (uid_t)val; |
0fd73091 | 3186 | |
7b50c609 | 3187 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { |
bc80f098 | 3188 | ERROR("No gid mapping for container root"); |
7b50c609 TS |
3189 | return -1; |
3190 | } | |
f4f52cb5 | 3191 | rootgid = (gid_t)val; |
2a9a80cb | 3192 | |
f4f52cb5 | 3193 | if (hostuid == 0) { |
7b50c609 | 3194 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3195 | ERROR("Error chowning %s", path); |
3196 | return -1; | |
3197 | } | |
0fd73091 | 3198 | |
c4d10a05 SH |
3199 | return 0; |
3200 | } | |
f3d7e4ca | 3201 | |
f4f52cb5 | 3202 | if (rootuid == hostuid) { |
1a0e70ac | 3203 | /* nothing to do */ |
b103ceac | 3204 | INFO("Container root is our uid; no need to chown"); |
f3d7e4ca SH |
3205 | return 0; |
3206 | } | |
3207 | ||
bbdbf8f0 | 3208 | /* save the current gid of "path" */ |
f4f52cb5 CB |
3209 | if (stat(path, &sb) < 0) { |
3210 | ERROR("Error stat %s", path); | |
f6d3e3e4 SH |
3211 | return -1; |
3212 | } | |
7b50c609 | 3213 | |
bbdbf8f0 CB |
3214 | /* Update the path argument in case this was overlayfs. */ |
3215 | args1[sizeof(args1) / sizeof(args1[0]) - 2] = path; | |
3216 | args2[sizeof(args2) / sizeof(args2[0]) - 2] = path; | |
3217 | ||
f4f52cb5 CB |
3218 | /* |
3219 | * A file has to be group-owned by a gid mapped into the | |
3220 | * container, or the container won't be privileged over it. | |
3221 | */ | |
3222 | DEBUG("trying to chown \"%s\" to %d", path, hostgid); | |
3223 | if (sb.st_uid == hostuid && | |
3224 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3225 | chown(path, -1, hostgid) < 0) { | |
3226 | ERROR("Failed chgrping %s", path); | |
3227 | return -1; | |
3228 | } | |
f6d3e3e4 | 3229 | |
1a0e70ac | 3230 | /* "u:0:rootuid:1" */ |
f4f52cb5 CB |
3231 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); |
3232 | if (ret < 0 || ret >= 100) { | |
3233 | ERROR("Error uid printing map string"); | |
3234 | return -1; | |
3235 | } | |
7b50c609 | 3236 | |
1a0e70ac | 3237 | /* "u:hostuid:hostuid:1" */ |
f4f52cb5 CB |
3238 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); |
3239 | if (ret < 0 || ret >= 100) { | |
3240 | ERROR("Error uid printing map string"); | |
3241 | return -1; | |
3242 | } | |
c4d10a05 | 3243 | |
1a0e70ac | 3244 | /* "g:0:rootgid:1" */ |
f4f52cb5 CB |
3245 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); |
3246 | if (ret < 0 || ret >= 100) { | |
3247 | ERROR("Error gid printing map string"); | |
3248 | return -1; | |
3249 | } | |
98e5ba51 | 3250 | |
1a0e70ac | 3251 | /* "g:pathgid:rootgid+pathgid:1" */ |
f4f52cb5 CB |
3252 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, |
3253 | rootgid + (gid_t)sb.st_gid); | |
3254 | if (ret < 0 || ret >= 100) { | |
3255 | ERROR("Error gid printing map string"); | |
3256 | return -1; | |
3257 | } | |
c4d10a05 | 3258 | |
1a0e70ac | 3259 | /* "g:hostgid:hostgid:1" */ |
f4f52cb5 CB |
3260 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); |
3261 | if (ret < 0 || ret >= 100) { | |
3262 | ERROR("Error gid printing map string"); | |
3263 | return -1; | |
3264 | } | |
7b50c609 | 3265 | |
1a0e70ac | 3266 | /* "0:pathgid" (chown) */ |
f4f52cb5 CB |
3267 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); |
3268 | if (ret < 0 || ret >= 100) { | |
3269 | ERROR("Error owner printing format string for chown"); | |
3270 | return -1; | |
3271 | } | |
7b50c609 | 3272 | |
f4f52cb5 CB |
3273 | if (hostgid == sb.st_gid) |
3274 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3275 | chown_mapped_root_exec_wrapper, | |
3276 | (void *)args1); | |
3277 | else | |
3278 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3279 | chown_mapped_root_exec_wrapper, | |
3280 | (void *)args2); | |
3281 | if (ret < 0) | |
3282 | ERROR("lxc-usernsexec failed: %s", cmd_output); | |
7b50c609 | 3283 | |
f4f52cb5 | 3284 | return ret; |
f6d3e3e4 SH |
3285 | } |
3286 | ||
943144d9 CB |
3287 | /* NOTE: Must not be called from inside the container namespace! */ |
3288 | int lxc_create_tmp_proc_mount(struct lxc_conf *conf) | |
5112cd70 SH |
3289 | { |
3290 | int mounted; | |
3291 | ||
943144d9 | 3292 | mounted = lxc_mount_proc_if_needed(conf->rootfs.path ? conf->rootfs.mount : ""); |
5112cd70 | 3293 | if (mounted == -1) { |
0fd73091 | 3294 | SYSERROR("Failed to mount proc in the container"); |
01958b1f | 3295 | /* continue only if there is no rootfs */ |
943144d9 | 3296 | if (conf->rootfs.path) |
01958b1f | 3297 | return -1; |
5112cd70 | 3298 | } else if (mounted == 1) { |
7a0bcca3 | 3299 | conf->tmp_umount_proc = true; |
5112cd70 | 3300 | } |
943144d9 | 3301 | |
5112cd70 SH |
3302 | return 0; |
3303 | } | |
3304 | ||
3305 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3306 | { | |
7a0bcca3 | 3307 | if (!lxc_conf->tmp_umount_proc) |
0fd73091 CB |
3308 | return; |
3309 | ||
7a0bcca3 CB |
3310 | (void)umount2("/proc", MNT_DETACH); |
3311 | lxc_conf->tmp_umount_proc = false; | |
5112cd70 SH |
3312 | } |
3313 | ||
0fd73091 | 3314 | /* Walk /proc/mounts and change any shared entries to slave. */ |
6a0c909a | 3315 | void remount_all_slave(void) |
e995d7a2 | 3316 | { |
6a49f05e CB |
3317 | int memfd, mntinfo_fd, ret; |
3318 | ssize_t copied; | |
0fd73091 | 3319 | FILE *f; |
e995d7a2 | 3320 | size_t len = 0; |
0fd73091 | 3321 | char *line = NULL; |
e995d7a2 | 3322 | |
6a49f05e | 3323 | mntinfo_fd = open("/proc/self/mountinfo", O_RDONLY | O_CLOEXEC); |
fea3b91d DJ |
3324 | if (mntinfo_fd < 0) { |
3325 | SYSERROR("Failed to open \"/proc/self/mountinfo\""); | |
6a49f05e | 3326 | return; |
fea3b91d | 3327 | } |
6a49f05e CB |
3328 | |
3329 | memfd = memfd_create(".lxc_mountinfo", MFD_CLOEXEC); | |
3330 | if (memfd < 0) { | |
3331 | char template[] = P_tmpdir "/.lxc_mountinfo_XXXXXX"; | |
3332 | ||
3333 | if (errno != ENOSYS) { | |
fea3b91d | 3334 | SYSERROR("Failed to create temporary in-memory file"); |
6a49f05e | 3335 | close(mntinfo_fd); |
6a49f05e CB |
3336 | return; |
3337 | } | |
3338 | ||
3339 | memfd = lxc_make_tmpfile(template, true); | |
fea3b91d DJ |
3340 | if (memfd < 0) { |
3341 | close(mntinfo_fd); | |
3342 | WARN("Failed to create temporary file"); | |
3343 | return; | |
3344 | } | |
6a49f05e CB |
3345 | } |
3346 | ||
6a49f05e | 3347 | again: |
7c4d9466 | 3348 | copied = lxc_sendfile_nointr(memfd, mntinfo_fd, NULL, LXC_SENDFILE_MAX); |
6a49f05e CB |
3349 | if (copied < 0) { |
3350 | if (errno == EINTR) | |
3351 | goto again; | |
3352 | ||
fea3b91d | 3353 | SYSERROR("Failed to copy \"/proc/self/mountinfo\""); |
6a49f05e CB |
3354 | close(mntinfo_fd); |
3355 | close(memfd); | |
6a49f05e CB |
3356 | return; |
3357 | } | |
3358 | close(mntinfo_fd); | |
3359 | ||
3360 | /* After a successful fdopen() memfd will be closed when calling | |
3361 | * fclose(f). Calling close(memfd) afterwards is undefined. | |
3362 | */ | |
3363 | ret = lseek(memfd, 0, SEEK_SET); | |
3364 | if (ret < 0) { | |
fea3b91d | 3365 | SYSERROR("Failed to reset file descriptor offset"); |
6a49f05e | 3366 | close(memfd); |
6a49f05e CB |
3367 | return; |
3368 | } | |
3369 | ||
3370 | f = fdopen(memfd, "r"); | |
e995d7a2 | 3371 | if (!f) { |
fea3b91d DJ |
3372 | SYSERROR("Failed to open copy of \"/proc/self/mountinfo\" to mark " |
3373 | "all shared. Continuing"); | |
6a49f05e | 3374 | close(memfd); |
e995d7a2 SH |
3375 | return; |
3376 | } | |
3377 | ||
3378 | while (getline(&line, &len, f) != -1) { | |
0fd73091 CB |
3379 | int ret; |
3380 | char *opts, *target; | |
3381 | ||
e995d7a2 SH |
3382 | target = get_field(line, 4); |
3383 | if (!target) | |
3384 | continue; | |
0fd73091 | 3385 | |
e995d7a2 SH |
3386 | opts = get_field(target, 2); |
3387 | if (!opts) | |
3388 | continue; | |
0fd73091 | 3389 | |
e995d7a2 SH |
3390 | null_endofword(opts); |
3391 | if (!strstr(opts, "shared")) | |
3392 | continue; | |
0fd73091 | 3393 | |
e995d7a2 | 3394 | null_endofword(target); |
0fd73091 CB |
3395 | ret = mount(NULL, target, NULL, MS_SLAVE, NULL); |
3396 | if (ret < 0) { | |
3397 | SYSERROR("Failed to make \"%s\" MS_SLAVE", target); | |
e995d7a2 | 3398 | ERROR("Continuing..."); |
6a49f05e | 3399 | continue; |
e995d7a2 | 3400 | } |
6a49f05e | 3401 | TRACE("Remounted \"%s\" as MS_SLAVE", target); |
e995d7a2 SH |
3402 | } |
3403 | fclose(f); | |
f10fad2f | 3404 | free(line); |
6a49f05e | 3405 | TRACE("Remounted all mount table entries as MS_SLAVE"); |
e995d7a2 SH |
3406 | } |
3407 | ||
794248d0 | 3408 | static int lxc_execute_bind_init(struct lxc_handler *handler) |
2322903b SH |
3409 | { |
3410 | int ret; | |
794248d0 CB |
3411 | char *p; |
3412 | char path[PATH_MAX], destpath[PATH_MAX]; | |
3413 | struct lxc_conf *conf = handler->conf; | |
9d9c111c SH |
3414 | |
3415 | /* If init exists in the container, don't bind mount a static one */ | |
3416 | p = choose_init(conf->rootfs.mount); | |
3417 | if (p) { | |
41089848 TA |
3418 | char *old = p; |
3419 | ||
3420 | p = strdup(old + strlen(conf->rootfs.mount)); | |
3421 | free(old); | |
3422 | if (!p) | |
3423 | return -ENOMEM; | |
3424 | ||
3425 | INFO("Found existing init at \"%s\"", p); | |
3426 | goto out; | |
9d9c111c | 3427 | } |
2322903b SH |
3428 | |
3429 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
0fd73091 | 3430 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3431 | return -1; |
2322903b SH |
3432 | |
3433 | if (!file_exists(path)) { | |
0fd73091 | 3434 | ERROR("The file \"%s\" does not exist on host", path); |
8353b4c9 | 3435 | return -1; |
2322903b SH |
3436 | } |
3437 | ||
794248d0 | 3438 | ret = snprintf(destpath, PATH_MAX, "%s" P_tmpdir "%s", conf->rootfs.mount, "/.lxc-init"); |
0fd73091 | 3439 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3440 | return -1; |
2322903b SH |
3441 | |
3442 | if (!file_exists(destpath)) { | |
794248d0 CB |
3443 | ret = mknod(destpath, S_IFREG | 0000, 0); |
3444 | if (ret < 0 && errno != EEXIST) { | |
3445 | SYSERROR("Failed to create dummy \"%s\" file as bind mount target", destpath); | |
8353b4c9 | 3446 | return -1; |
2322903b | 3447 | } |
2322903b SH |
3448 | } |
3449 | ||
592fd47a | 3450 | ret = safe_mount(path, destpath, "none", MS_BIND, NULL, conf->rootfs.mount); |
8353b4c9 | 3451 | if (ret < 0) { |
0fd73091 | 3452 | SYSERROR("Failed to bind mount lxc.init.static into container"); |
8353b4c9 CB |
3453 | return -1; |
3454 | } | |
3455 | ||
794248d0 CB |
3456 | p = strdup(destpath + strlen(conf->rootfs.mount)); |
3457 | if (!p) | |
3458 | return -ENOMEM; | |
794248d0 | 3459 | |
8353b4c9 | 3460 | INFO("Bind mounted lxc.init.static into container at \"%s\"", path); |
41089848 | 3461 | out: |
4b5b3a2a | 3462 | ((struct execute_args *)handler->data)->init_fd = -1; |
41089848 | 3463 | ((struct execute_args *)handler->data)->init_path = p; |
8353b4c9 | 3464 | return 0; |
2322903b SH |
3465 | } |
3466 | ||
0fd73091 CB |
3467 | /* This does the work of remounting / if it is shared, calling the container |
3468 | * pre-mount hooks, and mounting the rootfs. | |
35120d9c | 3469 | */ |
8ce1abc2 CB |
3470 | int lxc_setup_rootfs_prepare_root(struct lxc_conf *conf, const char *name, |
3471 | const char *lxcpath) | |
0ad19a3f | 3472 | { |
0fd73091 CB |
3473 | int ret; |
3474 | ||
35120d9c | 3475 | if (conf->rootfs_setup) { |
35120d9c | 3476 | const char *path = conf->rootfs.mount; |
0fd73091 CB |
3477 | |
3478 | /* The rootfs was set up in another namespace. bind-mount it to | |
3479 | * give us a mount in our own ns so we can pivot_root to it | |
3480 | */ | |
3481 | ret = mount(path, path, "rootfs", MS_BIND, NULL); | |
3482 | if (ret < 0) { | |
3483 | ERROR("Failed to bind mount container / onto itself"); | |
145832ba | 3484 | return -1; |
35120d9c | 3485 | } |
0fd73091 CB |
3486 | |
3487 | TRACE("Bind mounted container / onto itself"); | |
145832ba | 3488 | return 0; |
35120d9c | 3489 | } |
d4ef7c50 | 3490 | |
e995d7a2 SH |
3491 | remount_all_slave(); |
3492 | ||
0fd73091 CB |
3493 | ret = run_lxc_hooks(name, "pre-mount", conf, NULL); |
3494 | if (ret < 0) { | |
3495 | ERROR("Failed to run pre-mount hooks"); | |
35120d9c SH |
3496 | return -1; |
3497 | } | |
3498 | ||
8ce1abc2 | 3499 | ret = lxc_mount_rootfs(conf); |
0fd73091 CB |
3500 | if (ret < 0) { |
3501 | ERROR("Failed to setup rootfs for"); | |
35120d9c SH |
3502 | return -1; |
3503 | } | |
3504 | ||
3505 | conf->rootfs_setup = true; | |
3506 | return 0; | |
3507 | } | |
3508 | ||
1c1c7051 SH |
3509 | static bool verify_start_hooks(struct lxc_conf *conf) |
3510 | { | |
6b5a54cd | 3511 | char path[PATH_MAX]; |
0fd73091 CB |
3512 | struct lxc_list *it; |
3513 | ||
3514 | lxc_list_for_each (it, &conf->hooks[LXCHOOK_START]) { | |
1c1c7051 | 3515 | int ret; |
0fd73091 | 3516 | char *hookname = it->elem; |
1c1c7051 | 3517 | |
6b5a54cd | 3518 | ret = snprintf(path, PATH_MAX, "%s%s", |
0fd73091 CB |
3519 | conf->rootfs.path ? conf->rootfs.mount : "", |
3520 | hookname); | |
6b5a54cd | 3521 | if (ret < 0 || ret >= PATH_MAX) |
1c1c7051 | 3522 | return false; |
0fd73091 | 3523 | |
75193660 | 3524 | ret = access(path, X_OK); |
0fd73091 | 3525 | if (ret < 0) { |
75193660 | 3526 | SYSERROR("Start hook \"%s\" not found in container", |
0fd73091 | 3527 | hookname); |
1c1c7051 SH |
3528 | return false; |
3529 | } | |
0fd73091 | 3530 | |
6a0c909a | 3531 | return true; |
1c1c7051 SH |
3532 | } |
3533 | ||
3534 | return true; | |
3535 | } | |
3536 | ||
4b5b3a2a TA |
3537 | static bool execveat_supported(void) |
3538 | { | |
13be2733 | 3539 | lxc_raw_execveat(-1, "", NULL, NULL, AT_EMPTY_PATH); |
4b5b3a2a TA |
3540 | if (errno == ENOSYS) |
3541 | return false; | |
3542 | ||
3543 | return true; | |
4b5b3a2a TA |
3544 | } |
3545 | ||
3b988b33 | 3546 | int lxc_setup(struct lxc_handler *handler) |
35120d9c | 3547 | { |
2187efd3 | 3548 | int ret; |
0fd73091 | 3549 | const char *lxcpath = handler->lxcpath, *name = handler->name; |
35120d9c | 3550 | struct lxc_conf *lxc_conf = handler->conf; |
35120d9c | 3551 | |
8ce1abc2 | 3552 | ret = lxc_setup_rootfs_prepare_root(lxc_conf, name, lxcpath); |
8353b4c9 CB |
3553 | if (ret < 0) { |
3554 | ERROR("Failed to setup rootfs"); | |
35120d9c SH |
3555 | return -1; |
3556 | } | |
3557 | ||
28d9e29e | 3558 | if (handler->nsfd[LXC_NS_UTS] == -1) { |
8353b4c9 CB |
3559 | ret = setup_utsname(lxc_conf->utsname); |
3560 | if (ret < 0) { | |
0fd73091 | 3561 | ERROR("Failed to setup the utsname %s", name); |
6c544cb3 MM |
3562 | return -1; |
3563 | } | |
0ad19a3f | 3564 | } |
3565 | ||
b25291da CB |
3566 | ret = lxc_setup_keyring(); |
3567 | if (ret < 0) | |
3568 | return -1; | |
3569 | ||
8353b4c9 CB |
3570 | ret = lxc_setup_network_in_child_namespaces(lxc_conf, &lxc_conf->network); |
3571 | if (ret < 0) { | |
3572 | ERROR("Failed to setup network"); | |
95b5ffaf | 3573 | return -1; |
0ad19a3f | 3574 | } |
3575 | ||
8353b4c9 CB |
3576 | ret = lxc_network_send_name_and_ifindex_to_parent(handler); |
3577 | if (ret < 0) { | |
3578 | ERROR("Failed to send network device names and ifindices to parent"); | |
790255cf CB |
3579 | return -1; |
3580 | } | |
3581 | ||
bc6928ff | 3582 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3583 | ret = mount_autodev(name, &lxc_conf->rootfs, lxcpath); |
3584 | if (ret < 0) { | |
3585 | ERROR("Failed to mount \"/dev\""); | |
c6883f38 SH |
3586 | return -1; |
3587 | } | |
3588 | } | |
3589 | ||
8353b4c9 CB |
3590 | /* Do automatic mounts (mainly /proc and /sys), but exclude those that |
3591 | * need to wait until other stuff has finished. | |
368bbc02 | 3592 | */ |
8353b4c9 CB |
3593 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler); |
3594 | if (ret < 0) { | |
3595 | ERROR("Failed to setup first automatic mounts"); | |
368bbc02 CS |
3596 | return -1; |
3597 | } | |
3598 | ||
8353b4c9 CB |
3599 | ret = setup_mount(lxc_conf, &lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath); |
3600 | if (ret < 0) { | |
3601 | ERROR("Failed to setup mounts"); | |
95b5ffaf | 3602 | return -1; |
576f946d | 3603 | } |
3604 | ||
8353b4c9 | 3605 | if (lxc_conf->is_execute) { |
4b5b3a2a TA |
3606 | if (execveat_supported()) { |
3607 | int fd; | |
3608 | char path[PATH_MAX]; | |
3609 | ||
3610 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
3611 | if (ret < 0 || ret >= PATH_MAX) { | |
3612 | ERROR("Path to init.lxc.static too long"); | |
3613 | return -1; | |
3614 | } | |
3615 | ||
3616 | fd = open(path, O_PATH | O_CLOEXEC); | |
3617 | if (fd < 0) { | |
3618 | SYSERROR("Unable to open lxc.init.static"); | |
3619 | return -1; | |
3620 | } | |
3621 | ||
3622 | ((struct execute_args *)handler->data)->init_fd = fd; | |
3623 | ((struct execute_args *)handler->data)->init_path = NULL; | |
3624 | } else { | |
3625 | ret = lxc_execute_bind_init(handler); | |
3626 | if (ret < 0) { | |
3627 | ERROR("Failed to bind-mount the lxc init system"); | |
3628 | return -1; | |
3629 | } | |
8353b4c9 CB |
3630 | } |
3631 | } | |
2322903b | 3632 | |
8353b4c9 CB |
3633 | /* Now mount only cgroups, if wanted. Before, /sys could not have been |
3634 | * mounted. It is guaranteed to be mounted now either through | |
3635 | * automatically or via fstab entries. | |
368bbc02 | 3636 | */ |
8353b4c9 CB |
3637 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler); |
3638 | if (ret < 0) { | |
3639 | ERROR("Failed to setup remaining automatic mounts"); | |
368bbc02 CS |
3640 | return -1; |
3641 | } | |
3642 | ||
8353b4c9 | 3643 | ret = run_lxc_hooks(name, "mount", lxc_conf, NULL); |
1a2cf89d | 3644 | if (ret < 0) { |
8353b4c9 | 3645 | ERROR("Failed to run mount hooks"); |
773fb9ca SH |
3646 | return -1; |
3647 | } | |
3648 | ||
bc6928ff | 3649 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3650 | ret = run_lxc_hooks(name, "autodev", lxc_conf, NULL); |
3651 | if (ret < 0) { | |
3652 | ERROR("Failed to run autodev hooks"); | |
f7bee6c6 MW |
3653 | return -1; |
3654 | } | |
06749971 | 3655 | |
8353b4c9 CB |
3656 | ret = lxc_fill_autodev(&lxc_conf->rootfs); |
3657 | if (ret < 0) { | |
3658 | ERROR("Failed to populate \"/dev\""); | |
91c3830e SH |
3659 | return -1; |
3660 | } | |
3661 | } | |
368bbc02 | 3662 | |
8353b4c9 CB |
3663 | if (!lxc_list_empty(&lxc_conf->mount_list)) { |
3664 | ret = setup_mount_entries(lxc_conf, &lxc_conf->rootfs, | |
3665 | &lxc_conf->mount_list, name, lxcpath); | |
3666 | if (ret < 0) { | |
3667 | ERROR("Failed to setup mount entries"); | |
3668 | return -1; | |
3669 | } | |
181437fd YT |
3670 | } |
3671 | ||
75193660 CB |
3672 | /* Make sure any start hooks are in the container */ |
3673 | if (!verify_start_hooks(lxc_conf)) { | |
3674 | ERROR("Failed to verify start hooks"); | |
3675 | return -1; | |
3676 | } | |
3677 | ||
ed8704d0 | 3678 | ret = lxc_setup_console(&lxc_conf->rootfs, &lxc_conf->console, |
885766f5 | 3679 | lxc_conf->ttys.dir); |
ed8704d0 CB |
3680 | if (ret < 0) { |
3681 | ERROR("Failed to setup console"); | |
95b5ffaf | 3682 | return -1; |
6e590161 | 3683 | } |
3684 | ||
ed8704d0 CB |
3685 | ret = lxc_setup_dev_symlinks(&lxc_conf->rootfs); |
3686 | if (ret < 0) { | |
8353b4c9 | 3687 | ERROR("Failed to setup \"/dev\" symlinks"); |
69aa6655 DE |
3688 | return -1; |
3689 | } | |
3690 | ||
8353b4c9 CB |
3691 | ret = lxc_create_tmp_proc_mount(lxc_conf); |
3692 | if (ret < 0) { | |
3693 | ERROR("Failed to \"/proc\" LSMs"); | |
e075f5d9 | 3694 | return -1; |
e075f5d9 | 3695 | } |
e075f5d9 | 3696 | |
8ce1abc2 | 3697 | ret = lxc_setup_rootfs_switch_root(&lxc_conf->rootfs); |
8353b4c9 CB |
3698 | if (ret < 0) { |
3699 | ERROR("Failed to pivot root into rootfs"); | |
95b5ffaf | 3700 | return -1; |
ed502555 | 3701 | } |
3702 | ||
8353b4c9 CB |
3703 | ret = lxc_setup_devpts(lxc_conf); |
3704 | if (ret < 0) { | |
3705 | ERROR("Failed to setup new devpts instance"); | |
95b5ffaf | 3706 | return -1; |
3c26f34e | 3707 | } |
3708 | ||
2187efd3 CB |
3709 | ret = lxc_create_ttys(handler); |
3710 | if (ret < 0) | |
e8bd4e43 | 3711 | return -1; |
e8bd4e43 | 3712 | |
8353b4c9 CB |
3713 | ret = setup_personality(lxc_conf->personality); |
3714 | if (ret < 0) { | |
3715 | ERROR("Failed to set personality"); | |
cccc74b5 DL |
3716 | return -1; |
3717 | } | |
3718 | ||
8353b4c9 CB |
3719 | /* Set sysctl value to a path under /proc/sys as determined from the |
3720 | * key. For e.g. net.ipv4.ip_forward translated to | |
3721 | * /proc/sys/net/ipv4/ip_forward. | |
7edd0540 L |
3722 | */ |
3723 | if (!lxc_list_empty(&lxc_conf->sysctls)) { | |
3724 | ret = setup_sysctl_parameters(&lxc_conf->sysctls); | |
8353b4c9 CB |
3725 | if (ret < 0) { |
3726 | ERROR("Failed to setup sysctl parameters"); | |
7edd0540 | 3727 | return -1; |
8353b4c9 | 3728 | } |
7edd0540 L |
3729 | } |
3730 | ||
97a8f74f SG |
3731 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
3732 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
8353b4c9 CB |
3733 | ERROR("Container requests lxc.cap.drop and " |
3734 | "lxc.cap.keep: either use lxc.cap.drop or " | |
3735 | "lxc.cap.keep, not both"); | |
f6d3e3e4 SH |
3736 | return -1; |
3737 | } | |
8353b4c9 | 3738 | |
97a8f74f | 3739 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
8353b4c9 | 3740 | ERROR("Failed to keep capabilities"); |
97a8f74f SG |
3741 | return -1; |
3742 | } | |
3743 | } else if (setup_caps(&lxc_conf->caps)) { | |
8353b4c9 | 3744 | ERROR("Failed to drop capabilities"); |
97a8f74f | 3745 | return -1; |
81810dd1 DL |
3746 | } |
3747 | ||
8353b4c9 | 3748 | NOTICE("The container \"%s\" is set up", name); |
cd54d859 | 3749 | |
0ad19a3f | 3750 | return 0; |
3751 | } | |
26ddeedd | 3752 | |
3f60c2f7 | 3753 | int run_lxc_hooks(const char *name, char *hookname, struct lxc_conf *conf, |
14a7b0f9 | 3754 | char *argv[]) |
26ddeedd | 3755 | { |
26ddeedd | 3756 | struct lxc_list *it; |
3f60c2f7 | 3757 | int which = -1; |
26ddeedd | 3758 | |
3f60c2f7 | 3759 | if (strcmp(hookname, "pre-start") == 0) |
26ddeedd | 3760 | which = LXCHOOK_PRESTART; |
3f60c2f7 | 3761 | else if (strcmp(hookname, "start-host") == 0) |
08dd2805 | 3762 | which = LXCHOOK_START_HOST; |
3f60c2f7 | 3763 | else if (strcmp(hookname, "pre-mount") == 0) |
5ea6163a | 3764 | which = LXCHOOK_PREMOUNT; |
3f60c2f7 | 3765 | else if (strcmp(hookname, "mount") == 0) |
26ddeedd | 3766 | which = LXCHOOK_MOUNT; |
3f60c2f7 | 3767 | else if (strcmp(hookname, "autodev") == 0) |
f7bee6c6 | 3768 | which = LXCHOOK_AUTODEV; |
3f60c2f7 | 3769 | else if (strcmp(hookname, "start") == 0) |
26ddeedd | 3770 | which = LXCHOOK_START; |
3f60c2f7 | 3771 | else if (strcmp(hookname, "stop") == 0) |
52492063 | 3772 | which = LXCHOOK_STOP; |
3f60c2f7 | 3773 | else if (strcmp(hookname, "post-stop") == 0) |
26ddeedd | 3774 | which = LXCHOOK_POSTSTOP; |
3f60c2f7 | 3775 | else if (strcmp(hookname, "clone") == 0) |
148e91f5 | 3776 | which = LXCHOOK_CLONE; |
3f60c2f7 | 3777 | else if (strcmp(hookname, "destroy") == 0) |
37cf711b | 3778 | which = LXCHOOK_DESTROY; |
26ddeedd SH |
3779 | else |
3780 | return -1; | |
3f60c2f7 | 3781 | |
0fd73091 | 3782 | lxc_list_for_each (it, &conf->hooks[which]) { |
26ddeedd | 3783 | int ret; |
3f60c2f7 CB |
3784 | char *hook = it->elem; |
3785 | ||
3786 | ret = run_script_argv(name, conf->hooks_version, "lxc", hook, | |
14a7b0f9 | 3787 | hookname, argv); |
3f60c2f7 CB |
3788 | if (ret < 0) |
3789 | return -1; | |
26ddeedd | 3790 | } |
3f60c2f7 | 3791 | |
26ddeedd SH |
3792 | return 0; |
3793 | } | |
72d0e1cb | 3794 | |
72d0e1cb SG |
3795 | int lxc_clear_config_caps(struct lxc_conf *c) |
3796 | { | |
1a0e70ac | 3797 | struct lxc_list *it, *next; |
72d0e1cb | 3798 | |
0fd73091 | 3799 | lxc_list_for_each_safe (it, &c->caps, next) { |
72d0e1cb SG |
3800 | lxc_list_del(it); |
3801 | free(it->elem); | |
3802 | free(it); | |
3803 | } | |
0fd73091 | 3804 | |
72d0e1cb SG |
3805 | return 0; |
3806 | } | |
3807 | ||
c7e345ae CB |
3808 | static int lxc_free_idmap(struct lxc_list *id_map) |
3809 | { | |
27c27d73 SH |
3810 | struct lxc_list *it, *next; |
3811 | ||
0fd73091 | 3812 | lxc_list_for_each_safe (it, id_map, next) { |
27c27d73 SH |
3813 | lxc_list_del(it); |
3814 | free(it->elem); | |
3815 | free(it); | |
3816 | } | |
c7e345ae | 3817 | |
27c27d73 SH |
3818 | return 0; |
3819 | } | |
3820 | ||
4355ab5f SH |
3821 | int lxc_clear_idmaps(struct lxc_conf *c) |
3822 | { | |
3823 | return lxc_free_idmap(&c->id_map); | |
3824 | } | |
3825 | ||
1fb86a7c SH |
3826 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
3827 | { | |
0fd73091 | 3828 | struct lxc_list *it, *next; |
1fb86a7c | 3829 | |
0fd73091 | 3830 | lxc_list_for_each_safe (it, &c->keepcaps, next) { |
1fb86a7c SH |
3831 | lxc_list_del(it); |
3832 | free(it->elem); | |
3833 | free(it); | |
3834 | } | |
0fd73091 | 3835 | |
1fb86a7c SH |
3836 | return 0; |
3837 | } | |
3838 | ||
54860ed0 | 3839 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version) |
72d0e1cb | 3840 | { |
54860ed0 | 3841 | char *global_token, *namespaced_token; |
ab1a6cac | 3842 | size_t namespaced_token_len; |
54860ed0 | 3843 | struct lxc_list *it, *next, *list; |
ab1a6cac | 3844 | const char *k = key; |
54860ed0 | 3845 | bool all = false; |
72d0e1cb | 3846 | |
54860ed0 CB |
3847 | if (version == CGROUP2_SUPER_MAGIC) { |
3848 | global_token = "lxc.cgroup2"; | |
3849 | namespaced_token = "lxc.cgroup2."; | |
6333c915 | 3850 | namespaced_token_len = STRLITERALLEN("lxc.cgroup2."); |
54860ed0 CB |
3851 | list = &c->cgroup2; |
3852 | } else if (version == CGROUP_SUPER_MAGIC) { | |
3853 | global_token = "lxc.cgroup"; | |
3854 | namespaced_token = "lxc.cgroup."; | |
6333c915 | 3855 | namespaced_token_len = STRLITERALLEN("lxc.cgroup."); |
54860ed0 CB |
3856 | list = &c->cgroup; |
3857 | } else { | |
ab1a6cac | 3858 | return -EINVAL; |
54860ed0 CB |
3859 | } |
3860 | ||
3861 | if (strcmp(key, global_token) == 0) | |
72d0e1cb | 3862 | all = true; |
6333c915 | 3863 | else if (strncmp(key, namespaced_token, namespaced_token_len) == 0) |
ab1a6cac | 3864 | k += namespaced_token_len; |
a6390f01 | 3865 | else |
ab1a6cac | 3866 | return -EINVAL; |
72d0e1cb | 3867 | |
0fd73091 | 3868 | lxc_list_for_each_safe (it, list, next) { |
72d0e1cb | 3869 | struct lxc_cgroup *cg = it->elem; |
54860ed0 | 3870 | |
72d0e1cb SG |
3871 | if (!all && strcmp(cg->subsystem, k) != 0) |
3872 | continue; | |
54860ed0 | 3873 | |
72d0e1cb SG |
3874 | lxc_list_del(it); |
3875 | free(cg->subsystem); | |
3876 | free(cg->value); | |
3877 | free(cg); | |
3878 | free(it); | |
3879 | } | |
e409b214 | 3880 | |
72d0e1cb SG |
3881 | return 0; |
3882 | } | |
3883 | ||
c6d09e15 WB |
3884 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
3885 | { | |
3886 | struct lxc_list *it, *next; | |
c6d09e15 | 3887 | const char *k = NULL; |
0fd73091 | 3888 | bool all = false; |
c6d09e15 | 3889 | |
b668653c | 3890 | if (strcmp(key, "lxc.limit") == 0 || strcmp(key, "lxc.prlimit") == 0) |
c6d09e15 | 3891 | all = true; |
6333c915 CB |
3892 | else if (strncmp(key, "lxc.limit.", STRLITERALLEN("lxc.limit.")) == 0) |
3893 | k = key + STRLITERALLEN("lxc.limit."); | |
3894 | else if (strncmp(key, "lxc.prlimit.", STRLITERALLEN("lxc.prlimit.")) == 0) | |
3895 | k = key + STRLITERALLEN("lxc.prlimit."); | |
c6d09e15 WB |
3896 | else |
3897 | return -1; | |
3898 | ||
0fd73091 | 3899 | lxc_list_for_each_safe (it, &c->limits, next) { |
c6d09e15 | 3900 | struct lxc_limit *lim = it->elem; |
0fd73091 | 3901 | |
c6d09e15 WB |
3902 | if (!all && strcmp(lim->resource, k) != 0) |
3903 | continue; | |
0fd73091 | 3904 | |
c6d09e15 WB |
3905 | lxc_list_del(it); |
3906 | free(lim->resource); | |
3907 | free(lim); | |
3908 | free(it); | |
3909 | } | |
b668653c | 3910 | |
c6d09e15 WB |
3911 | return 0; |
3912 | } | |
3913 | ||
7edd0540 L |
3914 | int lxc_clear_sysctls(struct lxc_conf *c, const char *key) |
3915 | { | |
3916 | struct lxc_list *it, *next; | |
7edd0540 | 3917 | const char *k = NULL; |
0fd73091 | 3918 | bool all = false; |
7edd0540 L |
3919 | |
3920 | if (strcmp(key, "lxc.sysctl") == 0) | |
3921 | all = true; | |
6333c915 CB |
3922 | else if (strncmp(key, "lxc.sysctl.", STRLITERALLEN("lxc.sysctl.")) == 0) |
3923 | k = key + STRLITERALLEN("lxc.sysctl."); | |
7edd0540 L |
3924 | else |
3925 | return -1; | |
3926 | ||
0fd73091 | 3927 | lxc_list_for_each_safe (it, &c->sysctls, next) { |
7edd0540 | 3928 | struct lxc_sysctl *elem = it->elem; |
0fd73091 | 3929 | |
7edd0540 L |
3930 | if (!all && strcmp(elem->key, k) != 0) |
3931 | continue; | |
0fd73091 | 3932 | |
7edd0540 L |
3933 | lxc_list_del(it); |
3934 | free(elem->key); | |
3935 | free(elem->value); | |
3936 | free(elem); | |
3937 | free(it); | |
3938 | } | |
0fd73091 | 3939 | |
7edd0540 L |
3940 | return 0; |
3941 | } | |
3942 | ||
61d7a733 YT |
3943 | int lxc_clear_procs(struct lxc_conf *c, const char *key) |
3944 | { | |
0fd73091 | 3945 | struct lxc_list *it, *next; |
61d7a733 | 3946 | const char *k = NULL; |
0fd73091 | 3947 | bool all = false; |
61d7a733 YT |
3948 | |
3949 | if (strcmp(key, "lxc.proc") == 0) | |
3950 | all = true; | |
6333c915 CB |
3951 | else if (strncmp(key, "lxc.proc.", STRLITERALLEN("lxc.proc.")) == 0) |
3952 | k = key + STRLITERALLEN("lxc.proc."); | |
61d7a733 YT |
3953 | else |
3954 | return -1; | |
3955 | ||
0fd73091 | 3956 | lxc_list_for_each_safe (it, &c->procs, next) { |
61d7a733 | 3957 | struct lxc_proc *proc = it->elem; |
0fd73091 | 3958 | |
61d7a733 YT |
3959 | if (!all && strcmp(proc->filename, k) != 0) |
3960 | continue; | |
0fd73091 | 3961 | |
61d7a733 YT |
3962 | lxc_list_del(it); |
3963 | free(proc->filename); | |
3964 | free(proc->value); | |
3965 | free(proc); | |
3966 | free(it); | |
3967 | } | |
3968 | ||
3969 | return 0; | |
3970 | } | |
3971 | ||
ee1e7aa0 SG |
3972 | int lxc_clear_groups(struct lxc_conf *c) |
3973 | { | |
0fd73091 | 3974 | struct lxc_list *it, *next; |
ee1e7aa0 | 3975 | |
0fd73091 | 3976 | lxc_list_for_each_safe (it, &c->groups, next) { |
ee1e7aa0 SG |
3977 | lxc_list_del(it); |
3978 | free(it->elem); | |
3979 | free(it); | |
3980 | } | |
0fd73091 | 3981 | |
ee1e7aa0 SG |
3982 | return 0; |
3983 | } | |
3984 | ||
ab799c0b SG |
3985 | int lxc_clear_environment(struct lxc_conf *c) |
3986 | { | |
0fd73091 | 3987 | struct lxc_list *it, *next; |
ab799c0b | 3988 | |
0fd73091 | 3989 | lxc_list_for_each_safe (it, &c->environment, next) { |
ab799c0b SG |
3990 | lxc_list_del(it); |
3991 | free(it->elem); | |
3992 | free(it); | |
3993 | } | |
0fd73091 | 3994 | |
ab799c0b SG |
3995 | return 0; |
3996 | } | |
3997 | ||
72d0e1cb SG |
3998 | int lxc_clear_mount_entries(struct lxc_conf *c) |
3999 | { | |
0fd73091 | 4000 | struct lxc_list *it, *next; |
72d0e1cb | 4001 | |
0fd73091 | 4002 | lxc_list_for_each_safe (it, &c->mount_list, next) { |
72d0e1cb SG |
4003 | lxc_list_del(it); |
4004 | free(it->elem); | |
4005 | free(it); | |
4006 | } | |
0fd73091 | 4007 | |
72d0e1cb SG |
4008 | return 0; |
4009 | } | |
4010 | ||
b099e9e9 SH |
4011 | int lxc_clear_automounts(struct lxc_conf *c) |
4012 | { | |
4013 | c->auto_mounts = 0; | |
4014 | return 0; | |
4015 | } | |
4016 | ||
12a50cc6 | 4017 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 4018 | { |
72d0e1cb | 4019 | int i; |
0fd73091 CB |
4020 | struct lxc_list *it, *next; |
4021 | const char *k = NULL; | |
4022 | bool all = false, done = false; | |
72d0e1cb | 4023 | |
17ed13a3 SH |
4024 | if (strcmp(key, "lxc.hook") == 0) |
4025 | all = true; | |
6333c915 CB |
4026 | else if (strncmp(key, "lxc.hook.", STRLITERALLEN("lxc.hook.")) == 0) |
4027 | k = key + STRLITERALLEN("lxc.hook."); | |
a6390f01 WB |
4028 | else |
4029 | return -1; | |
17ed13a3 | 4030 | |
0fd73091 | 4031 | for (i = 0; i < NUM_LXC_HOOKS; i++) { |
17ed13a3 | 4032 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
0fd73091 | 4033 | lxc_list_for_each_safe (it, &c->hooks[i], next) { |
17ed13a3 SH |
4034 | lxc_list_del(it); |
4035 | free(it->elem); | |
4036 | free(it); | |
4037 | } | |
0fd73091 | 4038 | |
17ed13a3 | 4039 | done = true; |
72d0e1cb SG |
4040 | } |
4041 | } | |
17ed13a3 SH |
4042 | |
4043 | if (!done) { | |
4044 | ERROR("Invalid hook key: %s", key); | |
4045 | return -1; | |
4046 | } | |
0fd73091 | 4047 | |
72d0e1cb SG |
4048 | return 0; |
4049 | } | |
8eb5694b | 4050 | |
4184c3e1 SH |
4051 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
4052 | { | |
0fd73091 | 4053 | struct lxc_list *it, *next; |
4184c3e1 | 4054 | |
0fd73091 | 4055 | lxc_list_for_each_safe (it, &conf->aliens, next) { |
4184c3e1 SH |
4056 | lxc_list_del(it); |
4057 | free(it->elem); | |
4058 | free(it); | |
4059 | } | |
4060 | } | |
4061 | ||
c7b15d1e | 4062 | void lxc_clear_includes(struct lxc_conf *conf) |
f979ac15 | 4063 | { |
0fd73091 | 4064 | struct lxc_list *it, *next; |
f979ac15 | 4065 | |
0fd73091 | 4066 | lxc_list_for_each_safe (it, &conf->includes, next) { |
f979ac15 SH |
4067 | lxc_list_del(it); |
4068 | free(it->elem); | |
4069 | free(it); | |
4070 | } | |
4071 | } | |
4072 | ||
1800f924 WB |
4073 | int lxc_clear_apparmor_raw(struct lxc_conf *c) |
4074 | { | |
4075 | struct lxc_list *it, *next; | |
4076 | ||
4077 | lxc_list_for_each_safe (it, &c->lsm_aa_raw, next) { | |
4078 | lxc_list_del(it); | |
4079 | free(it->elem); | |
4080 | free(it); | |
4081 | } | |
4082 | ||
4083 | return 0; | |
4084 | } | |
4085 | ||
8eb5694b SH |
4086 | void lxc_conf_free(struct lxc_conf *conf) |
4087 | { | |
4088 | if (!conf) | |
4089 | return; | |
0fd73091 | 4090 | |
858377e4 SH |
4091 | if (current_config == conf) |
4092 | current_config = NULL; | |
aed105d5 | 4093 | lxc_terminal_conf_free(&conf->console); |
f10fad2f | 4094 | free(conf->rootfs.mount); |
b3b8c97f | 4095 | free(conf->rootfs.bdev_type); |
f10fad2f ME |
4096 | free(conf->rootfs.options); |
4097 | free(conf->rootfs.path); | |
f10fad2f | 4098 | free(conf->logfile); |
858377e4 SH |
4099 | if (conf->logfd != -1) |
4100 | close(conf->logfd); | |
f10fad2f | 4101 | free(conf->utsname); |
885766f5 CB |
4102 | free(conf->ttys.dir); |
4103 | free(conf->ttys.tty_names); | |
f10fad2f ME |
4104 | free(conf->fstab); |
4105 | free(conf->rcfile); | |
5cda27c1 | 4106 | free(conf->execute_cmd); |
f10fad2f | 4107 | free(conf->init_cmd); |
3c491553 | 4108 | free(conf->init_cwd); |
6b0d5538 | 4109 | free(conf->unexpanded_config); |
76d0127f | 4110 | free(conf->syslog); |
c302b476 | 4111 | lxc_free_networks(&conf->network); |
f10fad2f | 4112 | free(conf->lsm_aa_profile); |
1800f924 | 4113 | free(conf->lsm_aa_profile_computed); |
f10fad2f | 4114 | free(conf->lsm_se_context); |
769872f9 | 4115 | lxc_seccomp_free(conf); |
8eb5694b | 4116 | lxc_clear_config_caps(conf); |
1fb86a7c | 4117 | lxc_clear_config_keepcaps(conf); |
54860ed0 CB |
4118 | lxc_clear_cgroups(conf, "lxc.cgroup", CGROUP_SUPER_MAGIC); |
4119 | lxc_clear_cgroups(conf, "lxc.cgroup2", CGROUP2_SUPER_MAGIC); | |
17ed13a3 | 4120 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 4121 | lxc_clear_mount_entries(conf); |
27c27d73 | 4122 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 4123 | lxc_clear_groups(conf); |
f979ac15 | 4124 | lxc_clear_includes(conf); |
761d81ca | 4125 | lxc_clear_aliens(conf); |
ab799c0b | 4126 | lxc_clear_environment(conf); |
240d4b74 | 4127 | lxc_clear_limits(conf, "lxc.prlimit"); |
7edd0540 | 4128 | lxc_clear_sysctls(conf, "lxc.sysctl"); |
61d7a733 | 4129 | lxc_clear_procs(conf, "lxc.proc"); |
1800f924 | 4130 | lxc_clear_apparmor_raw(conf); |
43654d34 CB |
4131 | free(conf->cgroup_meta.dir); |
4132 | free(conf->cgroup_meta.controllers); | |
7a41e857 LT |
4133 | free(conf->shmount.path_host); |
4134 | free(conf->shmount.path_cont); | |
8eb5694b SH |
4135 | free(conf); |
4136 | } | |
4355ab5f SH |
4137 | |
4138 | struct userns_fn_data { | |
4139 | int (*fn)(void *); | |
c9b7c33e | 4140 | const char *fn_name; |
4355ab5f SH |
4141 | void *arg; |
4142 | int p[2]; | |
4143 | }; | |
4144 | ||
4145 | static int run_userns_fn(void *data) | |
4146 | { | |
adaffdd7 | 4147 | int ret; |
4355ab5f | 4148 | char c; |
0fd73091 | 4149 | struct userns_fn_data *d = data; |
4355ab5f | 4150 | |
f8aa4bf3 | 4151 | /* Close write end of the pipe. */ |
4355ab5f | 4152 | close(d->p[1]); |
f8aa4bf3 CB |
4153 | |
4154 | /* Wait for parent to finish establishing a new mapping in the user | |
4155 | * namespace we are executing in. | |
4156 | */ | |
adaffdd7 | 4157 | ret = lxc_read_nointr(d->p[0], &c, 1); |
f8aa4bf3 | 4158 | /* Close read end of the pipe. */ |
4355ab5f | 4159 | close(d->p[0]); |
adaffdd7 CB |
4160 | if (ret != 1) |
4161 | return -1; | |
f8aa4bf3 | 4162 | |
c9b7c33e | 4163 | if (d->fn_name) |
adaffdd7 | 4164 | TRACE("Calling function \"%s\"", d->fn_name); |
0fd73091 | 4165 | |
f8aa4bf3 | 4166 | /* Call function to run. */ |
4355ab5f SH |
4167 | return d->fn(d->arg); |
4168 | } | |
4169 | ||
db7cfe23 CB |
4170 | static struct id_map *mapped_nsid_add(struct lxc_conf *conf, unsigned id, |
4171 | enum idtype idtype) | |
4172 | { | |
5173b710 CB |
4173 | const struct id_map *map; |
4174 | struct id_map *retmap; | |
db7cfe23 CB |
4175 | |
4176 | map = find_mapped_nsid_entry(conf, id, idtype); | |
4177 | if (!map) | |
4178 | return NULL; | |
4179 | ||
4180 | retmap = malloc(sizeof(*retmap)); | |
4181 | if (!retmap) | |
4182 | return NULL; | |
4183 | ||
4184 | memcpy(retmap, map, sizeof(*retmap)); | |
4185 | return retmap; | |
4186 | } | |
4187 | ||
c4333195 CB |
4188 | static struct id_map *find_mapped_hostid_entry(struct lxc_conf *conf, |
4189 | unsigned id, enum idtype idtype) | |
f8aa4bf3 | 4190 | { |
f8aa4bf3 | 4191 | struct id_map *map; |
0fd73091 | 4192 | struct lxc_list *it; |
f8aa4bf3 CB |
4193 | struct id_map *retmap = NULL; |
4194 | ||
0fd73091 | 4195 | lxc_list_for_each (it, &conf->id_map) { |
f8aa4bf3 CB |
4196 | map = it->elem; |
4197 | if (map->idtype != idtype) | |
4198 | continue; | |
4199 | ||
4200 | if (id >= map->hostid && id < map->hostid + map->range) { | |
4201 | retmap = map; | |
4202 | break; | |
4203 | } | |
4204 | } | |
4205 | ||
f8aa4bf3 CB |
4206 | return retmap; |
4207 | } | |
4208 | ||
0fd73091 | 4209 | /* Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
f8aa4bf3 | 4210 | * existing one or establish a new one. |
4355ab5f | 4211 | */ |
0fd73091 CB |
4212 | static struct id_map *mapped_hostid_add(struct lxc_conf *conf, uid_t id, |
4213 | enum idtype type) | |
4355ab5f | 4214 | { |
28a2d9e7 | 4215 | int hostid_mapped; |
c4333195 CB |
4216 | struct id_map *entry = NULL, *tmp = NULL; |
4217 | ||
4218 | entry = malloc(sizeof(*entry)); | |
4219 | if (!entry) | |
4220 | return NULL; | |
f8aa4bf3 | 4221 | |
28a2d9e7 | 4222 | /* Reuse existing mapping. */ |
c4333195 CB |
4223 | tmp = find_mapped_hostid_entry(conf, id, type); |
4224 | if (tmp) | |
4225 | return memcpy(entry, tmp, sizeof(*entry)); | |
f8aa4bf3 | 4226 | |
28a2d9e7 CB |
4227 | /* Find new mapping. */ |
4228 | hostid_mapped = find_unmapped_nsid(conf, type); | |
4229 | if (hostid_mapped < 0) { | |
c4333195 CB |
4230 | DEBUG("Failed to find free mapping for id %d", id); |
4231 | free(entry); | |
28a2d9e7 | 4232 | return NULL; |
f8aa4bf3 | 4233 | } |
f8aa4bf3 | 4234 | |
28a2d9e7 CB |
4235 | entry->idtype = type; |
4236 | entry->nsid = hostid_mapped; | |
4237 | entry->hostid = (unsigned long)id; | |
4238 | entry->range = 1; | |
4355ab5f | 4239 | |
28a2d9e7 | 4240 | return entry; |
4355ab5f SH |
4241 | } |
4242 | ||
dcf0ffdf | 4243 | struct lxc_list *get_minimal_idmap(struct lxc_conf *conf) |
4355ab5f | 4244 | { |
f8aa4bf3 | 4245 | uid_t euid, egid; |
4160c3a0 CB |
4246 | uid_t nsuid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; |
4247 | gid_t nsgid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
f8aa4bf3 | 4248 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
28a2d9e7 CB |
4249 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, |
4250 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4355ab5f | 4251 | |
db7cfe23 | 4252 | /* Find container root mappings. */ |
4160c3a0 | 4253 | container_root_uid = mapped_nsid_add(conf, nsuid, ID_TYPE_UID); |
db7cfe23 | 4254 | if (!container_root_uid) { |
dcf0ffdf | 4255 | DEBUG("Failed to find mapping for namespace uid %d", 0); |
db7cfe23 | 4256 | goto on_error; |
f8aa4bf3 | 4257 | } |
dcf0ffdf CB |
4258 | euid = geteuid(); |
4259 | if (euid >= container_root_uid->hostid && | |
4260 | euid < (container_root_uid->hostid + container_root_uid->range)) | |
db7cfe23 | 4261 | host_uid_map = container_root_uid; |
f8aa4bf3 | 4262 | |
4160c3a0 | 4263 | container_root_gid = mapped_nsid_add(conf, nsgid, ID_TYPE_GID); |
db7cfe23 | 4264 | if (!container_root_gid) { |
dcf0ffdf | 4265 | DEBUG("Failed to find mapping for namespace gid %d", 0); |
f8aa4bf3 CB |
4266 | goto on_error; |
4267 | } | |
dcf0ffdf CB |
4268 | egid = getegid(); |
4269 | if (egid >= container_root_gid->hostid && | |
4270 | egid < (container_root_gid->hostid + container_root_gid->range)) | |
db7cfe23 | 4271 | host_gid_map = container_root_gid; |
f8aa4bf3 CB |
4272 | |
4273 | /* Check whether the {g,u}id of the user has a mapping. */ | |
954b7d9b | 4274 | if (!host_uid_map) |
c4333195 | 4275 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
28a2d9e7 | 4276 | if (!host_uid_map) { |
db7cfe23 | 4277 | DEBUG("Failed to find mapping for uid %d", euid); |
f8aa4bf3 CB |
4278 | goto on_error; |
4279 | } | |
4280 | ||
dcf0ffdf CB |
4281 | if (!host_gid_map) |
4282 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); | |
28a2d9e7 | 4283 | if (!host_gid_map) { |
db7cfe23 | 4284 | DEBUG("Failed to find mapping for gid %d", egid); |
28a2d9e7 CB |
4285 | goto on_error; |
4286 | } | |
4287 | ||
4288 | /* Allocate new {g,u}id map list. */ | |
4289 | idmap = malloc(sizeof(*idmap)); | |
4290 | if (!idmap) | |
4291 | goto on_error; | |
4292 | lxc_list_init(idmap); | |
4293 | ||
f8aa4bf3 CB |
4294 | /* Add container root to the map. */ |
4295 | tmplist = malloc(sizeof(*tmplist)); | |
4296 | if (!tmplist) | |
4297 | goto on_error; | |
4298 | lxc_list_add_elem(tmplist, container_root_uid); | |
4299 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4300 | |
1d90e064 | 4301 | if (host_uid_map && (host_uid_map != container_root_uid)) { |
28a2d9e7 CB |
4302 | /* idmap will now keep track of that memory. */ |
4303 | container_root_uid = NULL; | |
4304 | ||
4305 | /* Add container root to the map. */ | |
4306 | tmplist = malloc(sizeof(*tmplist)); | |
4307 | if (!tmplist) | |
4308 | goto on_error; | |
4309 | lxc_list_add_elem(tmplist, host_uid_map); | |
4310 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4311 | } |
1d90e064 CB |
4312 | /* idmap will now keep track of that memory. */ |
4313 | container_root_uid = NULL; | |
4314 | /* idmap will now keep track of that memory. */ | |
4315 | host_uid_map = NULL; | |
f8aa4bf3 CB |
4316 | |
4317 | tmplist = malloc(sizeof(*tmplist)); | |
4318 | if (!tmplist) | |
4319 | goto on_error; | |
4320 | lxc_list_add_elem(tmplist, container_root_gid); | |
4321 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4322 | |
1d90e064 | 4323 | if (host_gid_map && (host_gid_map != container_root_gid)) { |
28a2d9e7 CB |
4324 | /* idmap will now keep track of that memory. */ |
4325 | container_root_gid = NULL; | |
4326 | ||
4327 | tmplist = malloc(sizeof(*tmplist)); | |
4328 | if (!tmplist) | |
4329 | goto on_error; | |
4330 | lxc_list_add_elem(tmplist, host_gid_map); | |
4331 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4332 | } |
1d90e064 CB |
4333 | /* idmap will now keep track of that memory. */ |
4334 | container_root_gid = NULL; | |
4335 | /* idmap will now keep track of that memory. */ | |
4336 | host_gid_map = NULL; | |
f8aa4bf3 | 4337 | |
dcf0ffdf CB |
4338 | TRACE("Allocated minimal idmapping"); |
4339 | return idmap; | |
4340 | ||
4341 | on_error: | |
4dc41f99 | 4342 | if (idmap) { |
dcf0ffdf | 4343 | lxc_free_idmap(idmap); |
4dc41f99 SX |
4344 | free(idmap); |
4345 | } | |
dcf0ffdf CB |
4346 | if (container_root_uid) |
4347 | free(container_root_uid); | |
4348 | if (container_root_gid) | |
4349 | free(container_root_gid); | |
4350 | if (host_uid_map && (host_uid_map != container_root_uid)) | |
4351 | free(host_uid_map); | |
4352 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4353 | free(host_gid_map); | |
4354 | ||
4355 | return NULL; | |
4356 | } | |
4357 | ||
4358 | /* Run a function in a new user namespace. | |
4359 | * The caller's euid/egid will be mapped if it is not already. | |
4360 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
4361 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
4362 | * This means we require only to establish a mapping from: | |
4363 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
4364 | * - the container root -> some sub{g,u}id | |
4365 | * The former we add, if the user did not specifiy a mapping. The latter we | |
4366 | * retrieve from the ontainer's configured {g,u}id mappings as it must have been | |
4367 | * there to start the container in the first place. | |
4368 | */ | |
4369 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data, | |
4370 | const char *fn_name) | |
4371 | { | |
4372 | pid_t pid; | |
dcf0ffdf | 4373 | int p[2]; |
0fd73091 | 4374 | struct userns_fn_data d; |
dcf0ffdf | 4375 | struct lxc_list *idmap; |
0fd73091 CB |
4376 | int ret = -1, status = -1; |
4377 | char c = '1'; | |
dcf0ffdf | 4378 | |
2b2655a8 CB |
4379 | if (!conf) |
4380 | return -EINVAL; | |
4381 | ||
dcf0ffdf CB |
4382 | idmap = get_minimal_idmap(conf); |
4383 | if (!idmap) | |
4384 | return -1; | |
4385 | ||
979f9e34 | 4386 | ret = pipe2(p, O_CLOEXEC); |
dcf0ffdf CB |
4387 | if (ret < 0) { |
4388 | SYSERROR("Failed to create pipe"); | |
4389 | return -1; | |
4390 | } | |
4391 | d.fn = fn; | |
4392 | d.fn_name = fn_name; | |
4393 | d.arg = data; | |
4394 | d.p[0] = p[0]; | |
4395 | d.p[1] = p[1]; | |
4396 | ||
4397 | /* Clone child in new user namespace. */ | |
4398 | pid = lxc_raw_clone_cb(run_userns_fn, &d, CLONE_NEWUSER); | |
4399 | if (pid < 0) { | |
0fd73091 | 4400 | ERROR("Failed to clone process in new user namespace"); |
dcf0ffdf CB |
4401 | goto on_error; |
4402 | } | |
4403 | ||
4404 | close(p[0]); | |
4405 | p[0] = -1; | |
4406 | ||
4b73005c CB |
4407 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || |
4408 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
dcf0ffdf | 4409 | struct id_map *map; |
0fd73091 | 4410 | struct lxc_list *it; |
dcf0ffdf | 4411 | |
0fd73091 | 4412 | lxc_list_for_each (it, idmap) { |
f8aa4bf3 | 4413 | map = it->elem; |
dcf0ffdf | 4414 | TRACE("Establishing %cid mapping for \"%d\" in new " |
f8aa4bf3 | 4415 | "user namespace: nsuid %lu - hostid %lu - range " |
0fd73091 CB |
4416 | "%lu", |
4417 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4418 | map->nsid, map->hostid, map->range); | |
f8aa4bf3 | 4419 | } |
4355ab5f SH |
4420 | } |
4421 | ||
f8aa4bf3 | 4422 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 4423 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 | 4424 | if (ret < 0) { |
0fd73091 | 4425 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); |
f8aa4bf3 | 4426 | goto on_error; |
4355ab5f SH |
4427 | } |
4428 | ||
f8aa4bf3 | 4429 | /* Tell child to proceed. */ |
489f39be | 4430 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
dcf0ffdf | 4431 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
f8aa4bf3 | 4432 | goto on_error; |
4355ab5f SH |
4433 | } |
4434 | ||
686dd5d1 | 4435 | on_error: |
4355ab5f SH |
4436 | if (p[0] != -1) |
4437 | close(p[0]); | |
4438 | close(p[1]); | |
f8aa4bf3 | 4439 | |
ee1b16bc TA |
4440 | /* Wait for child to finish. */ |
4441 | if (pid > 0) | |
4442 | status = wait_for_pid(pid); | |
4443 | ||
686dd5d1 CB |
4444 | if (status < 0) |
4445 | ret = -1; | |
4446 | ||
f8aa4bf3 | 4447 | return ret; |
4355ab5f | 4448 | } |
97e9cfa0 | 4449 | |
415a8851 CB |
4450 | int userns_exec_full(struct lxc_conf *conf, int (*fn)(void *), void *data, |
4451 | const char *fn_name) | |
4452 | { | |
4453 | pid_t pid; | |
4454 | uid_t euid, egid; | |
415a8851 CB |
4455 | int p[2]; |
4456 | struct id_map *map; | |
4457 | struct lxc_list *cur; | |
0fd73091 | 4458 | struct userns_fn_data d; |
415a8851 | 4459 | int ret = -1; |
0fd73091 | 4460 | char c = '1'; |
415a8851 CB |
4461 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
4462 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, | |
4463 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4464 | ||
2b2655a8 CB |
4465 | if (!conf) |
4466 | return -EINVAL; | |
4467 | ||
979f9e34 | 4468 | ret = pipe2(p, O_CLOEXEC); |
415a8851 CB |
4469 | if (ret < 0) { |
4470 | SYSERROR("opening pipe"); | |
4471 | return -1; | |
4472 | } | |
4473 | d.fn = fn; | |
4474 | d.fn_name = fn_name; | |
4475 | d.arg = data; | |
4476 | d.p[0] = p[0]; | |
4477 | d.p[1] = p[1]; | |
4478 | ||
4479 | /* Clone child in new user namespace. */ | |
4480 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER); | |
4481 | if (pid < 0) { | |
0fd73091 | 4482 | ERROR("Failed to clone process in new user namespace"); |
415a8851 CB |
4483 | goto on_error; |
4484 | } | |
4485 | ||
4486 | close(p[0]); | |
4487 | p[0] = -1; | |
4488 | ||
4489 | euid = geteuid(); | |
4490 | egid = getegid(); | |
4491 | ||
4492 | /* Allocate new {g,u}id map list. */ | |
4493 | idmap = malloc(sizeof(*idmap)); | |
4494 | if (!idmap) | |
4495 | goto on_error; | |
4496 | lxc_list_init(idmap); | |
4497 | ||
4498 | /* Find container root. */ | |
0fd73091 | 4499 | lxc_list_for_each (cur, &conf->id_map) { |
415a8851 CB |
4500 | struct id_map *tmpmap; |
4501 | ||
4502 | tmplist = malloc(sizeof(*tmplist)); | |
4503 | if (!tmplist) | |
4504 | goto on_error; | |
4505 | ||
4506 | tmpmap = malloc(sizeof(*tmpmap)); | |
4507 | if (!tmpmap) { | |
4508 | free(tmplist); | |
4509 | goto on_error; | |
4510 | } | |
4511 | ||
4512 | memset(tmpmap, 0, sizeof(*tmpmap)); | |
4513 | memcpy(tmpmap, cur->elem, sizeof(*tmpmap)); | |
4514 | tmplist->elem = tmpmap; | |
4515 | ||
4516 | lxc_list_add_tail(idmap, tmplist); | |
4517 | ||
4518 | map = cur->elem; | |
4519 | ||
4520 | if (map->idtype == ID_TYPE_UID) | |
4521 | if (euid >= map->hostid && euid < map->hostid + map->range) | |
4522 | host_uid_map = map; | |
4523 | ||
4524 | if (map->idtype == ID_TYPE_GID) | |
4525 | if (egid >= map->hostid && egid < map->hostid + map->range) | |
4526 | host_gid_map = map; | |
4527 | ||
4528 | if (map->nsid != 0) | |
4529 | continue; | |
4530 | ||
4531 | if (map->idtype == ID_TYPE_UID) | |
4532 | if (container_root_uid == NULL) | |
4533 | container_root_uid = map; | |
4534 | ||
4535 | if (map->idtype == ID_TYPE_GID) | |
4536 | if (container_root_gid == NULL) | |
4537 | container_root_gid = map; | |
4538 | } | |
4539 | ||
4540 | if (!container_root_uid || !container_root_gid) { | |
4541 | ERROR("No mapping for container root found"); | |
4542 | goto on_error; | |
4543 | } | |
4544 | ||
4545 | /* Check whether the {g,u}id of the user has a mapping. */ | |
4546 | if (!host_uid_map) | |
c4333195 | 4547 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
415a8851 CB |
4548 | else |
4549 | host_uid_map = container_root_uid; | |
4550 | ||
4551 | if (!host_gid_map) | |
c4333195 | 4552 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); |
415a8851 CB |
4553 | else |
4554 | host_gid_map = container_root_gid; | |
4555 | ||
4556 | if (!host_uid_map) { | |
4557 | DEBUG("Failed to find mapping for uid %d", euid); | |
4558 | goto on_error; | |
4559 | } | |
4560 | ||
4561 | if (!host_gid_map) { | |
4562 | DEBUG("Failed to find mapping for gid %d", egid); | |
4563 | goto on_error; | |
4564 | } | |
4565 | ||
4566 | if (host_uid_map && (host_uid_map != container_root_uid)) { | |
4567 | /* Add container root to the map. */ | |
4568 | tmplist = malloc(sizeof(*tmplist)); | |
4569 | if (!tmplist) | |
4570 | goto on_error; | |
4571 | lxc_list_add_elem(tmplist, host_uid_map); | |
4572 | lxc_list_add_tail(idmap, tmplist); | |
4573 | } | |
4574 | /* idmap will now keep track of that memory. */ | |
4575 | host_uid_map = NULL; | |
4576 | ||
4577 | if (host_gid_map && (host_gid_map != container_root_gid)) { | |
4578 | tmplist = malloc(sizeof(*tmplist)); | |
4579 | if (!tmplist) | |
4580 | goto on_error; | |
4581 | lxc_list_add_elem(tmplist, host_gid_map); | |
4582 | lxc_list_add_tail(idmap, tmplist); | |
4583 | } | |
4584 | /* idmap will now keep track of that memory. */ | |
4585 | host_gid_map = NULL; | |
4586 | ||
4587 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || | |
4588 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
0fd73091 | 4589 | lxc_list_for_each (cur, idmap) { |
415a8851 CB |
4590 | map = cur->elem; |
4591 | TRACE("establishing %cid mapping for \"%d\" in new " | |
4592 | "user namespace: nsuid %lu - hostid %lu - range " | |
4593 | "%lu", | |
4594 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4595 | map->nsid, map->hostid, map->range); | |
4596 | } | |
4597 | } | |
4598 | ||
4599 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
4600 | ret = lxc_map_ids(idmap, pid); | |
4601 | if (ret < 0) { | |
0fd73091 | 4602 | ERROR("error setting up {g,u}id mappings for child process \"%d\"", pid); |
415a8851 CB |
4603 | goto on_error; |
4604 | } | |
4605 | ||
4606 | /* Tell child to proceed. */ | |
489f39be | 4607 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
0fd73091 | 4608 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
415a8851 CB |
4609 | goto on_error; |
4610 | } | |
4611 | ||
686dd5d1 | 4612 | on_error: |
ee1b16bc TA |
4613 | if (p[0] != -1) |
4614 | close(p[0]); | |
4615 | close(p[1]); | |
4616 | ||
415a8851 | 4617 | /* Wait for child to finish. */ |
686dd5d1 CB |
4618 | if (pid > 0) |
4619 | ret = wait_for_pid(pid); | |
415a8851 | 4620 | |
80758b4b | 4621 | if (idmap) { |
415a8851 | 4622 | lxc_free_idmap(idmap); |
80758b4b DJ |
4623 | free(idmap); |
4624 | } | |
4625 | ||
415a8851 CB |
4626 | if (host_uid_map && (host_uid_map != container_root_uid)) |
4627 | free(host_uid_map); | |
4628 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4629 | free(host_gid_map); | |
4630 | ||
415a8851 CB |
4631 | return ret; |
4632 | } | |
4633 | ||
a96a8e8c | 4634 | /* not thread-safe, do not use from api without first forking */ |
0fd73091 | 4635 | static char *getuname(void) |
97e9cfa0 | 4636 | { |
cb7aa5e8 DJ |
4637 | struct passwd pwent; |
4638 | struct passwd *pwentp = NULL; | |
4639 | char *buf; | |
4640 | char *username; | |
4641 | size_t bufsize; | |
4642 | int ret; | |
97e9cfa0 | 4643 | |
cb7aa5e8 DJ |
4644 | bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); |
4645 | if (bufsize == -1) | |
4646 | bufsize = 1024; | |
4647 | ||
4648 | buf = malloc(bufsize); | |
4649 | if (!buf) | |
97e9cfa0 SH |
4650 | return NULL; |
4651 | ||
cb7aa5e8 DJ |
4652 | ret = getpwuid_r(geteuid(), &pwent, buf, bufsize, &pwentp); |
4653 | if (!pwentp) { | |
4654 | if (ret == 0) | |
4655 | WARN("Could not find matched password record."); | |
4656 | ||
4657 | ERROR("Failed to get password record - %u", geteuid()); | |
4658 | free(buf); | |
4659 | return NULL; | |
4660 | } | |
4661 | ||
4662 | username = strdup(pwent.pw_name); | |
4663 | free(buf); | |
4664 | ||
4665 | return username; | |
97e9cfa0 SH |
4666 | } |
4667 | ||
a96a8e8c | 4668 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4669 | static char *getgname(void) |
4670 | { | |
3de9fb4c DJ |
4671 | struct group grent; |
4672 | struct group *grentp = NULL; | |
4673 | char *buf; | |
4674 | char *grname; | |
4675 | size_t bufsize; | |
4676 | int ret; | |
4677 | ||
4678 | bufsize = sysconf(_SC_GETGR_R_SIZE_MAX); | |
4679 | if (bufsize == -1) | |
4680 | bufsize = 1024; | |
4681 | ||
4682 | buf = malloc(bufsize); | |
4683 | if (!buf) | |
4684 | return NULL; | |
4685 | ||
4686 | ret = getgrgid_r(getegid(), &grent, buf, bufsize, &grentp); | |
4687 | if (!grentp) { | |
4688 | if (ret == 0) | |
4689 | WARN("Could not find matched group record"); | |
97e9cfa0 | 4690 | |
3de9fb4c DJ |
4691 | ERROR("Failed to get group record - %u", getegid()); |
4692 | free(buf); | |
97e9cfa0 | 4693 | return NULL; |
3de9fb4c DJ |
4694 | } |
4695 | ||
4696 | grname = strdup(grent.gr_name); | |
4697 | free(buf); | |
97e9cfa0 | 4698 | |
3de9fb4c | 4699 | return grname; |
97e9cfa0 SH |
4700 | } |
4701 | ||
a96a8e8c | 4702 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4703 | void suggest_default_idmap(void) |
4704 | { | |
0fd73091 | 4705 | char *uname, *gname; |
97e9cfa0 SH |
4706 | FILE *f; |
4707 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; | |
97e9cfa0 | 4708 | size_t len = 0; |
0fd73091 | 4709 | char *line = NULL; |
97e9cfa0 | 4710 | |
0fd73091 CB |
4711 | uname = getuname(); |
4712 | if (!uname) | |
97e9cfa0 SH |
4713 | return; |
4714 | ||
0fd73091 CB |
4715 | gname = getgname(); |
4716 | if (!gname) { | |
97e9cfa0 SH |
4717 | free(uname); |
4718 | return; | |
4719 | } | |
4720 | ||
4721 | f = fopen(subuidfile, "r"); | |
4722 | if (!f) { | |
4723 | ERROR("Your system is not configured with subuids"); | |
4724 | free(gname); | |
4725 | free(uname); | |
4726 | return; | |
4727 | } | |
0fd73091 | 4728 | |
97e9cfa0 | 4729 | while (getline(&line, &len, f) != -1) { |
0fd73091 | 4730 | char *p, *p2; |
b7930180 | 4731 | size_t no_newline = 0; |
0fd73091 CB |
4732 | |
4733 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4734 | if (*line == '#') |
4735 | continue; | |
4736 | if (!p) | |
4737 | continue; | |
4738 | *p = '\0'; | |
4739 | p++; | |
0fd73091 | 4740 | |
97e9cfa0 SH |
4741 | if (strcmp(line, uname)) |
4742 | continue; | |
0fd73091 | 4743 | |
97e9cfa0 SH |
4744 | p2 = strchr(p, ':'); |
4745 | if (!p2) | |
4746 | continue; | |
4747 | *p2 = '\0'; | |
4748 | p2++; | |
4749 | if (!*p2) | |
4750 | continue; | |
b7930180 CB |
4751 | no_newline = strcspn(p2, "\n"); |
4752 | p2[no_newline] = '\0'; | |
4753 | ||
b7b2fde4 | 4754 | if (lxc_safe_uint(p, &uid) < 0) |
0fd73091 | 4755 | WARN("Could not parse UID"); |
b7b2fde4 | 4756 | if (lxc_safe_uint(p2, &urange) < 0) |
0fd73091 | 4757 | WARN("Could not parse UID range"); |
97e9cfa0 SH |
4758 | } |
4759 | fclose(f); | |
4760 | ||
6be7389a | 4761 | f = fopen(subgidfile, "r"); |
97e9cfa0 SH |
4762 | if (!f) { |
4763 | ERROR("Your system is not configured with subgids"); | |
4764 | free(gname); | |
4765 | free(uname); | |
4766 | return; | |
4767 | } | |
0fd73091 | 4768 | |
97e9cfa0 | 4769 | while (getline(&line, &len, f) != -1) { |
0fd73091 | 4770 | char *p, *p2; |
b7930180 | 4771 | size_t no_newline = 0; |
0fd73091 CB |
4772 | |
4773 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4774 | if (*line == '#') |
4775 | continue; | |
4776 | if (!p) | |
4777 | continue; | |
4778 | *p = '\0'; | |
4779 | p++; | |
0fd73091 | 4780 | |
97e9cfa0 SH |
4781 | if (strcmp(line, uname)) |
4782 | continue; | |
0fd73091 | 4783 | |
97e9cfa0 SH |
4784 | p2 = strchr(p, ':'); |
4785 | if (!p2) | |
4786 | continue; | |
4787 | *p2 = '\0'; | |
4788 | p2++; | |
4789 | if (!*p2) | |
4790 | continue; | |
b7930180 CB |
4791 | no_newline = strcspn(p2, "\n"); |
4792 | p2[no_newline] = '\0'; | |
4793 | ||
b7b2fde4 | 4794 | if (lxc_safe_uint(p, &gid) < 0) |
0fd73091 | 4795 | WARN("Could not parse GID"); |
b7b2fde4 | 4796 | if (lxc_safe_uint(p2, &grange) < 0) |
0fd73091 | 4797 | WARN("Could not parse GID range"); |
97e9cfa0 SH |
4798 | } |
4799 | fclose(f); | |
4800 | ||
f10fad2f | 4801 | free(line); |
97e9cfa0 SH |
4802 | |
4803 | if (!urange || !grange) { | |
4804 | ERROR("You do not have subuids or subgids allocated"); | |
4805 | ERROR("Unprivileged containers require subuids and subgids"); | |
fbd4a4d1 | 4806 | free(uname); |
1e7cd2f7 | 4807 | free(gname); |
97e9cfa0 SH |
4808 | return; |
4809 | } | |
4810 | ||
4811 | ERROR("You must either run as root, or define uid mappings"); | |
4812 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4813 | ERROR("~/.config/lxc/default.conf:"); | |
4814 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
bdcbb6b3 CB |
4815 | ERROR("lxc.idmap = u 0 %u %u", uid, urange); |
4816 | ERROR("lxc.idmap = g 0 %u %u", gid, grange); | |
97e9cfa0 SH |
4817 | |
4818 | free(gname); | |
4819 | free(uname); | |
4820 | } | |
aaf26830 | 4821 | |
a7307747 SH |
4822 | static void free_cgroup_settings(struct lxc_list *result) |
4823 | { | |
4824 | struct lxc_list *iterator, *next; | |
4825 | ||
0fd73091 | 4826 | lxc_list_for_each_safe (iterator, result, next) { |
a7307747 SH |
4827 | lxc_list_del(iterator); |
4828 | free(iterator); | |
4829 | } | |
4830 | free(result); | |
4831 | } | |
4832 | ||
0fd73091 | 4833 | /* Return the list of cgroup_settings sorted according to the following rules |
aaf26830 KT |
4834 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes |
4835 | */ | |
0fd73091 | 4836 | struct lxc_list *sort_cgroup_settings(struct lxc_list *cgroup_settings) |
aaf26830 KT |
4837 | { |
4838 | struct lxc_list *result; | |
aaf26830 | 4839 | struct lxc_cgroup *cg = NULL; |
0fd73091 | 4840 | struct lxc_list *it = NULL, *item = NULL, *memsw_limit = NULL; |
aaf26830 KT |
4841 | |
4842 | result = malloc(sizeof(*result)); | |
0fd73091 | 4843 | if (!result) |
fac7c663 | 4844 | return NULL; |
aaf26830 KT |
4845 | lxc_list_init(result); |
4846 | ||
0fd73091 CB |
4847 | /* Iterate over the cgroup settings and copy them to the output list. */ |
4848 | lxc_list_for_each (it, cgroup_settings) { | |
aaf26830 | 4849 | item = malloc(sizeof(*item)); |
fac7c663 | 4850 | if (!item) { |
a7307747 | 4851 | free_cgroup_settings(result); |
fac7c663 KT |
4852 | return NULL; |
4853 | } | |
0fd73091 | 4854 | |
aaf26830 KT |
4855 | item->elem = it->elem; |
4856 | cg = it->elem; | |
4857 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
4858 | /* Store the memsw_limit location */ | |
4859 | memsw_limit = item; | |
0fd73091 CB |
4860 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && |
4861 | memsw_limit != NULL) { | |
4862 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found | |
4863 | * before lxc.cgroup.memory.limit_in_bytes, swap these | |
4864 | * two items */ | |
aaf26830 KT |
4865 | item->elem = memsw_limit->elem; |
4866 | memsw_limit->elem = it->elem; | |
4867 | } | |
4868 | lxc_list_add_tail(result, item); | |
4869 | } | |
4870 | ||
4871 | return result; | |
a7307747 | 4872 | } |