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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" | |
2f443e88 | 70 | #include "memory_utils.h" |
d38dd64a CB |
71 | #include "namespace.h" |
72 | #include "network.h" | |
73 | #include "parse.h" | |
13be2733 | 74 | #include "raw_syscalls.h" |
d38dd64a CB |
75 | #include "ringbuf.h" |
76 | #include "start.h" | |
77 | #include "storage.h" | |
78 | #include "storage/overlay.h" | |
6b3d24d7 | 79 | #include "syscall_wrappers.h" |
d38dd64a CB |
80 | #include "terminal.h" |
81 | #include "utils.h" | |
82 | ||
af6824fc | 83 | #ifdef MAJOR_IN_MKDEV |
9d257a2a | 84 | #include <sys/mkdev.h> |
af6824fc | 85 | #endif |
af6824fc | 86 | |
614305f3 | 87 | #ifdef HAVE_STATVFS |
2938f7c8 | 88 | #include <sys/statvfs.h> |
614305f3 | 89 | #endif |
e827ff7e SG |
90 | |
91 | #if HAVE_PTY_H | |
b0a33c1e | 92 | #include <pty.h> |
e827ff7e SG |
93 | #else |
94 | #include <../include/openpty.h> | |
95 | #endif | |
0ad19a3f | 96 | |
9d257a2a CB |
97 | #if HAVE_LIBCAP |
98 | #include <sys/capability.h> | |
99 | #endif | |
100 | ||
101 | #if HAVE_SYS_PERSONALITY_H | |
102 | #include <sys/personality.h> | |
103 | #endif | |
104 | ||
f1e05b90 DJ |
105 | #ifndef HAVE_STRLCAT |
106 | #include "include/strlcat.h" | |
107 | #endif | |
108 | ||
9d257a2a CB |
109 | #if IS_BIONIC |
110 | #include <../include/lxcmntent.h> | |
111 | #else | |
112 | #include <mntent.h> | |
113 | #endif | |
114 | ||
115 | #if !defined(HAVE_PRLIMIT) && defined(HAVE_PRLIMIT64) | |
116 | #include <../include/prlimit.h> | |
117 | #endif | |
118 | ||
ac2cecc4 | 119 | lxc_log_define(conf, lxc); |
e5bda9ee | 120 | |
0fd73091 CB |
121 | /* The lxc_conf of the container currently being worked on in an API call. |
122 | * This is used in the error calls. | |
123 | */ | |
124 | #ifdef HAVE_TLS | |
d7f19646 | 125 | thread_local struct lxc_conf *current_config; |
0fd73091 CB |
126 | #else |
127 | struct lxc_conf *current_config; | |
128 | #endif | |
8912711c | 129 | |
0fd73091 CB |
130 | char *lxchook_names[NUM_LXC_HOOKS] = { |
131 | "pre-start", | |
132 | "pre-mount", | |
133 | "mount", | |
134 | "autodev", | |
135 | "start", | |
136 | "stop", | |
137 | "post-stop", | |
138 | "clone", | |
139 | "destroy", | |
140 | "start-host" | |
141 | }; | |
72d0e1cb | 142 | |
998ac676 RT |
143 | struct mount_opt { |
144 | char *name; | |
145 | int clear; | |
146 | int flag; | |
147 | }; | |
148 | ||
81810dd1 DL |
149 | struct caps_opt { |
150 | char *name; | |
151 | int value; | |
152 | }; | |
153 | ||
c6d09e15 WB |
154 | struct limit_opt { |
155 | char *name; | |
156 | int value; | |
157 | }; | |
158 | ||
998ac676 | 159 | static struct mount_opt mount_opt[] = { |
470b359b CB |
160 | { "async", 1, MS_SYNCHRONOUS }, |
161 | { "atime", 1, MS_NOATIME }, | |
162 | { "bind", 0, MS_BIND }, | |
88d413d5 | 163 | { "defaults", 0, 0 }, |
88d413d5 | 164 | { "dev", 1, MS_NODEV }, |
470b359b | 165 | { "diratime", 1, MS_NODIRATIME }, |
88d413d5 | 166 | { "dirsync", 0, MS_DIRSYNC }, |
470b359b | 167 | { "exec", 1, MS_NOEXEC }, |
8912711c | 168 | { "lazytime", 0, MS_LAZYTIME }, |
88d413d5 | 169 | { "mand", 0, MS_MANDLOCK }, |
88d413d5 | 170 | { "noatime", 0, MS_NOATIME }, |
470b359b | 171 | { "nodev", 0, MS_NODEV }, |
88d413d5 | 172 | { "nodiratime", 0, MS_NODIRATIME }, |
470b359b CB |
173 | { "noexec", 0, MS_NOEXEC }, |
174 | { "nomand", 1, MS_MANDLOCK }, | |
175 | { "norelatime", 1, MS_RELATIME }, | |
176 | { "nostrictatime", 1, MS_STRICTATIME }, | |
177 | { "nosuid", 0, MS_NOSUID }, | |
88d413d5 SW |
178 | { "rbind", 0, MS_BIND|MS_REC }, |
179 | { "relatime", 0, MS_RELATIME }, | |
470b359b CB |
180 | { "remount", 0, MS_REMOUNT }, |
181 | { "ro", 0, MS_RDONLY }, | |
182 | { "rw", 1, MS_RDONLY }, | |
88d413d5 | 183 | { "strictatime", 0, MS_STRICTATIME }, |
470b359b CB |
184 | { "suid", 1, MS_NOSUID }, |
185 | { "sync", 0, MS_SYNCHRONOUS }, | |
88d413d5 | 186 | { NULL, 0, 0 }, |
998ac676 RT |
187 | }; |
188 | ||
d840039e | 189 | static struct mount_opt propagation_opt[] = { |
0fd73091 CB |
190 | { "private", 0, MS_PRIVATE }, |
191 | { "shared", 0, MS_SHARED }, | |
192 | { "slave", 0, MS_SLAVE }, | |
193 | { "unbindable", 0, MS_UNBINDABLE }, | |
194 | { "rprivate", 0, MS_PRIVATE|MS_REC }, | |
195 | { "rshared", 0, MS_SHARED|MS_REC }, | |
196 | { "rslave", 0, MS_SLAVE|MS_REC }, | |
197 | { "runbindable", 0, MS_UNBINDABLE|MS_REC }, | |
198 | { NULL, 0, 0 }, | |
d840039e YT |
199 | }; |
200 | ||
81810dd1 | 201 | static struct caps_opt caps_opt[] = { |
8560cd36 | 202 | #if HAVE_LIBCAP |
0fd73091 CB |
203 | { "chown", CAP_CHOWN }, |
204 | { "dac_override", CAP_DAC_OVERRIDE }, | |
205 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
206 | { "fowner", CAP_FOWNER }, | |
207 | { "fsetid", CAP_FSETID }, | |
208 | { "kill", CAP_KILL }, | |
209 | { "setgid", CAP_SETGID }, | |
210 | { "setuid", CAP_SETUID }, | |
211 | { "setpcap", CAP_SETPCAP }, | |
212 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
213 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
214 | { "net_broadcast", CAP_NET_BROADCAST }, | |
215 | { "net_admin", CAP_NET_ADMIN }, | |
216 | { "net_raw", CAP_NET_RAW }, | |
217 | { "ipc_lock", CAP_IPC_LOCK }, | |
218 | { "ipc_owner", CAP_IPC_OWNER }, | |
219 | { "sys_module", CAP_SYS_MODULE }, | |
220 | { "sys_rawio", CAP_SYS_RAWIO }, | |
221 | { "sys_chroot", CAP_SYS_CHROOT }, | |
222 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
223 | { "sys_pacct", CAP_SYS_PACCT }, | |
224 | { "sys_admin", CAP_SYS_ADMIN }, | |
225 | { "sys_boot", CAP_SYS_BOOT }, | |
226 | { "sys_nice", CAP_SYS_NICE }, | |
227 | { "sys_resource", CAP_SYS_RESOURCE }, | |
228 | { "sys_time", CAP_SYS_TIME }, | |
229 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
230 | { "mknod", CAP_MKNOD }, | |
231 | { "lease", CAP_LEASE }, | |
57b837e2 | 232 | #ifdef CAP_AUDIT_READ |
0fd73091 | 233 | { "audit_read", CAP_AUDIT_READ }, |
57b837e2 | 234 | #endif |
9527e566 | 235 | #ifdef CAP_AUDIT_WRITE |
0fd73091 | 236 | { "audit_write", CAP_AUDIT_WRITE }, |
9527e566 FW |
237 | #endif |
238 | #ifdef CAP_AUDIT_CONTROL | |
0fd73091 | 239 | { "audit_control", CAP_AUDIT_CONTROL }, |
9527e566 | 240 | #endif |
0fd73091 CB |
241 | { "setfcap", CAP_SETFCAP }, |
242 | { "mac_override", CAP_MAC_OVERRIDE }, | |
243 | { "mac_admin", CAP_MAC_ADMIN }, | |
5170c716 | 244 | #ifdef CAP_SYSLOG |
0fd73091 | 245 | { "syslog", CAP_SYSLOG }, |
5170c716 CS |
246 | #endif |
247 | #ifdef CAP_WAKE_ALARM | |
0fd73091 | 248 | { "wake_alarm", CAP_WAKE_ALARM }, |
5170c716 | 249 | #endif |
2b54359b | 250 | #ifdef CAP_BLOCK_SUSPEND |
0fd73091 | 251 | { "block_suspend", CAP_BLOCK_SUSPEND }, |
2b54359b | 252 | #endif |
495d2046 | 253 | #endif |
8560cd36 | 254 | }; |
81810dd1 | 255 | |
c6d09e15 WB |
256 | static struct limit_opt limit_opt[] = { |
257 | #ifdef RLIMIT_AS | |
258 | { "as", RLIMIT_AS }, | |
259 | #endif | |
260 | #ifdef RLIMIT_CORE | |
261 | { "core", RLIMIT_CORE }, | |
262 | #endif | |
263 | #ifdef RLIMIT_CPU | |
264 | { "cpu", RLIMIT_CPU }, | |
265 | #endif | |
266 | #ifdef RLIMIT_DATA | |
267 | { "data", RLIMIT_DATA }, | |
268 | #endif | |
269 | #ifdef RLIMIT_FSIZE | |
270 | { "fsize", RLIMIT_FSIZE }, | |
271 | #endif | |
272 | #ifdef RLIMIT_LOCKS | |
273 | { "locks", RLIMIT_LOCKS }, | |
274 | #endif | |
275 | #ifdef RLIMIT_MEMLOCK | |
276 | { "memlock", RLIMIT_MEMLOCK }, | |
277 | #endif | |
278 | #ifdef RLIMIT_MSGQUEUE | |
279 | { "msgqueue", RLIMIT_MSGQUEUE }, | |
280 | #endif | |
281 | #ifdef RLIMIT_NICE | |
282 | { "nice", RLIMIT_NICE }, | |
283 | #endif | |
284 | #ifdef RLIMIT_NOFILE | |
285 | { "nofile", RLIMIT_NOFILE }, | |
286 | #endif | |
287 | #ifdef RLIMIT_NPROC | |
288 | { "nproc", RLIMIT_NPROC }, | |
289 | #endif | |
290 | #ifdef RLIMIT_RSS | |
291 | { "rss", RLIMIT_RSS }, | |
292 | #endif | |
293 | #ifdef RLIMIT_RTPRIO | |
294 | { "rtprio", RLIMIT_RTPRIO }, | |
295 | #endif | |
296 | #ifdef RLIMIT_RTTIME | |
297 | { "rttime", RLIMIT_RTTIME }, | |
298 | #endif | |
299 | #ifdef RLIMIT_SIGPENDING | |
300 | { "sigpending", RLIMIT_SIGPENDING }, | |
301 | #endif | |
302 | #ifdef RLIMIT_STACK | |
303 | { "stack", RLIMIT_STACK }, | |
304 | #endif | |
305 | }; | |
306 | ||
91c3830e SH |
307 | static int run_buffer(char *buffer) |
308 | { | |
cc6a0e78 | 309 | __do_free char *output = NULL; |
ebf3a6af | 310 | int fd, ret; |
0fd73091 | 311 | struct lxc_popen_FILE *f; |
91c3830e | 312 | |
ebec9176 | 313 | f = lxc_popen(buffer); |
91c3830e | 314 | if (!f) { |
3f60c2f7 | 315 | SYSERROR("Failed to popen() %s", buffer); |
91c3830e SH |
316 | return -1; |
317 | } | |
318 | ||
319 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
320 | if (!output) { | |
3f60c2f7 | 321 | ERROR("Failed to allocate memory for %s", buffer); |
ebec9176 | 322 | lxc_pclose(f); |
91c3830e SH |
323 | return -1; |
324 | } | |
325 | ||
ebf3a6af CB |
326 | fd = fileno(f->f); |
327 | if (fd < 0) { | |
328 | SYSERROR("Failed to retrieve underlying file descriptor"); | |
329 | lxc_pclose(f); | |
330 | return -1; | |
331 | } | |
332 | ||
333 | for (int i = 0; i < 10; i++) { | |
334 | ssize_t bytes_read; | |
335 | ||
336 | bytes_read = lxc_read_nointr(fd, output, LXC_LOG_BUFFER_SIZE - 1); | |
337 | if (bytes_read > 0) { | |
338 | output[bytes_read] = '\0'; | |
339 | DEBUG("Script %s produced output: %s", buffer, output); | |
340 | continue; | |
341 | } | |
342 | ||
343 | break; | |
344 | } | |
91c3830e | 345 | |
ebec9176 | 346 | ret = lxc_pclose(f); |
8e7da691 | 347 | if (ret == -1) { |
3f60c2f7 | 348 | SYSERROR("Script exited with error"); |
91c3830e | 349 | return -1; |
8e7da691 | 350 | } else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) { |
3f60c2f7 | 351 | ERROR("Script exited with status %d", WEXITSTATUS(ret)); |
8e7da691 DE |
352 | return -1; |
353 | } else if (WIFSIGNALED(ret)) { | |
3f60c2f7 | 354 | ERROR("Script terminated by signal %d", WTERMSIG(ret)); |
8e7da691 | 355 | return -1; |
91c3830e SH |
356 | } |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
14a7b0f9 CB |
361 | int run_script_argv(const char *name, unsigned int hook_version, |
362 | const char *section, const char *script, | |
586b1ce7 | 363 | const char *hookname, char **argv) |
148e91f5 | 364 | { |
e1a94937 | 365 | __do_free char *buffer = NULL; |
3f60c2f7 | 366 | int buf_pos, i, ret; |
d08e5708 | 367 | size_t size = 0; |
148e91f5 | 368 | |
3f60c2f7 CB |
369 | if (hook_version == 0) |
370 | INFO("Executing script \"%s\" for container \"%s\", config " | |
371 | "section \"%s\"", script, name, section); | |
372 | else | |
373 | INFO("Executing script \"%s\" for container \"%s\"", script, name); | |
148e91f5 | 374 | |
586b1ce7 CB |
375 | for (i = 0; argv && argv[i]; i++) |
376 | size += strlen(argv[i]) + 1; | |
148e91f5 | 377 | |
6333c915 CB |
378 | size += STRLITERALLEN("exec"); |
379 | size++; | |
148e91f5 | 380 | size += strlen(script); |
3f60c2f7 CB |
381 | size++; |
382 | ||
148e91f5 | 383 | if (size > INT_MAX) |
3f60c2f7 | 384 | return -EFBIG; |
148e91f5 | 385 | |
3f60c2f7 | 386 | if (hook_version == 0) { |
d08e5708 CB |
387 | size += strlen(hookname); |
388 | size++; | |
389 | ||
390 | size += strlen(name); | |
391 | size++; | |
392 | ||
393 | size += strlen(section); | |
394 | size++; | |
395 | ||
396 | if (size > INT_MAX) | |
397 | return -EFBIG; | |
327cce76 | 398 | } |
3f60c2f7 | 399 | |
6f8d00d2 CB |
400 | buffer = malloc(size); |
401 | if (!buffer) | |
402 | return -ENOMEM; | |
403 | ||
327cce76 | 404 | if (hook_version == 0) |
3f60c2f7 | 405 | buf_pos = snprintf(buffer, size, "exec %s %s %s %s", script, name, section, hookname); |
327cce76 | 406 | else |
3f60c2f7 | 407 | buf_pos = snprintf(buffer, size, "exec %s", script); |
327cce76 CB |
408 | if (buf_pos < 0 || (size_t)buf_pos >= size) { |
409 | ERROR("Failed to create command line for script \"%s\"", script); | |
e1a94937 | 410 | return -1; |
327cce76 | 411 | } |
3f60c2f7 | 412 | |
327cce76 | 413 | if (hook_version == 1) { |
3f60c2f7 CB |
414 | ret = setenv("LXC_HOOK_TYPE", hookname, 1); |
415 | if (ret < 0) { | |
416 | SYSERROR("Failed to set environment variable: " | |
417 | "LXC_HOOK_TYPE=%s", hookname); | |
e1a94937 | 418 | return -1; |
3f60c2f7 | 419 | } |
90f20466 | 420 | TRACE("Set environment variable: LXC_HOOK_TYPE=%s", hookname); |
3f60c2f7 CB |
421 | |
422 | ret = setenv("LXC_HOOK_SECTION", section, 1); | |
423 | if (ret < 0) { | |
424 | SYSERROR("Failed to set environment variable: " | |
425 | "LXC_HOOK_SECTION=%s", section); | |
e1a94937 | 426 | return -1; |
3f60c2f7 CB |
427 | } |
428 | TRACE("Set environment variable: LXC_HOOK_SECTION=%s", section); | |
14a7b0f9 CB |
429 | |
430 | if (strcmp(section, "net") == 0) { | |
431 | char *parent; | |
432 | ||
586b1ce7 | 433 | if (!argv || !argv[0]) |
e1a94937 | 434 | return -1; |
14a7b0f9 | 435 | |
586b1ce7 | 436 | ret = setenv("LXC_NET_TYPE", argv[0], 1); |
14a7b0f9 CB |
437 | if (ret < 0) { |
438 | SYSERROR("Failed to set environment variable: " | |
586b1ce7 | 439 | "LXC_NET_TYPE=%s", argv[0]); |
e1a94937 | 440 | return -1; |
14a7b0f9 | 441 | } |
586b1ce7 | 442 | TRACE("Set environment variable: LXC_NET_TYPE=%s", argv[0]); |
14a7b0f9 | 443 | |
586b1ce7 | 444 | parent = argv[1] ? argv[1] : ""; |
14a7b0f9 | 445 | |
a8144263 | 446 | if (strcmp(argv[0], "macvlan") == 0) { |
14a7b0f9 CB |
447 | ret = setenv("LXC_NET_PARENT", parent, 1); |
448 | if (ret < 0) { | |
449 | SYSERROR("Failed to set environment " | |
450 | "variable: LXC_NET_PARENT=%s", parent); | |
e1a94937 | 451 | return -1; |
14a7b0f9 CB |
452 | } |
453 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
a8144263 | 454 | } else if (strcmp(argv[0], "phys") == 0) { |
14a7b0f9 CB |
455 | ret = setenv("LXC_NET_PARENT", parent, 1); |
456 | if (ret < 0) { | |
457 | SYSERROR("Failed to set environment " | |
458 | "variable: LXC_NET_PARENT=%s", parent); | |
e1a94937 | 459 | return -1; |
14a7b0f9 CB |
460 | } |
461 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
a8144263 | 462 | } else if (strcmp(argv[0], "veth") == 0) { |
586b1ce7 | 463 | char *peer = argv[2] ? argv[2] : ""; |
14a7b0f9 CB |
464 | |
465 | ret = setenv("LXC_NET_PEER", peer, 1); | |
466 | if (ret < 0) { | |
467 | SYSERROR("Failed to set environment " | |
468 | "variable: LXC_NET_PEER=%s", peer); | |
e1a94937 | 469 | return -1; |
14a7b0f9 CB |
470 | } |
471 | TRACE("Set environment variable: LXC_NET_PEER=%s", peer); | |
472 | ||
473 | ret = setenv("LXC_NET_PARENT", parent, 1); | |
474 | if (ret < 0) { | |
475 | SYSERROR("Failed to set environment " | |
476 | "variable: LXC_NET_PARENT=%s", parent); | |
e1a94937 | 477 | return -1; |
14a7b0f9 CB |
478 | } |
479 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
480 | } | |
481 | } | |
148e91f5 SH |
482 | } |
483 | ||
586b1ce7 | 484 | for (i = 0; argv && argv[i]; i++) { |
3f60c2f7 CB |
485 | size_t len = size - buf_pos; |
486 | ||
586b1ce7 | 487 | ret = snprintf(buffer + buf_pos, len, " %s", argv[i]); |
3f60c2f7 CB |
488 | if (ret < 0 || (size_t)ret >= len) { |
489 | ERROR("Failed to create command line for script \"%s\"", script); | |
e1a94937 | 490 | return -1; |
148e91f5 | 491 | } |
3f60c2f7 | 492 | buf_pos += ret; |
148e91f5 SH |
493 | } |
494 | ||
e1a94937 | 495 | return run_buffer(buffer); |
148e91f5 SH |
496 | } |
497 | ||
811ef482 | 498 | int run_script(const char *name, const char *section, const char *script, ...) |
e3b4c4c4 | 499 | { |
2f443e88 | 500 | __do_free char *buffer = NULL; |
abbfd20b | 501 | int ret; |
2f443e88 | 502 | char *p; |
abbfd20b | 503 | va_list ap; |
0fd73091 | 504 | size_t size = 0; |
751d9dcd | 505 | |
0fd73091 | 506 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\"", |
751d9dcd | 507 | script, name, section); |
e3b4c4c4 | 508 | |
abbfd20b DL |
509 | va_start(ap, script); |
510 | while ((p = va_arg(ap, char *))) | |
95642a10 | 511 | size += strlen(p) + 1; |
abbfd20b DL |
512 | va_end(ap); |
513 | ||
6333c915 | 514 | size += STRLITERALLEN("exec"); |
abbfd20b DL |
515 | size += strlen(script); |
516 | size += strlen(name); | |
517 | size += strlen(section); | |
6d1a5f93 | 518 | size += 4; |
abbfd20b | 519 | |
95642a10 MS |
520 | if (size > INT_MAX) |
521 | return -1; | |
522 | ||
2f443e88 | 523 | buffer = must_realloc(NULL, size); |
6d1a5f93 | 524 | ret = snprintf(buffer, size, "exec %s %s %s", script, name, section); |
0fd73091 | 525 | if (ret < 0 || ret >= size) |
9ba8130c | 526 | return -1; |
751d9dcd | 527 | |
abbfd20b | 528 | va_start(ap, script); |
9ba8130c | 529 | while ((p = va_arg(ap, char *))) { |
062b72c6 | 530 | int len = size - ret; |
9ba8130c SH |
531 | int rc; |
532 | rc = snprintf(buffer + ret, len, " %s", p); | |
7b5a2435 DJ |
533 | if (rc < 0 || rc >= len) { |
534 | va_end(ap); | |
9ba8130c | 535 | return -1; |
7b5a2435 | 536 | } |
9ba8130c SH |
537 | ret += rc; |
538 | } | |
abbfd20b | 539 | va_end(ap); |
751d9dcd | 540 | |
91c3830e | 541 | return run_buffer(buffer); |
e3b4c4c4 ST |
542 | } |
543 | ||
0fd73091 | 544 | /* pin_rootfs |
63fc76c3 | 545 | * if rootfs is a directory, then open ${rootfs}/.lxc-keep for writing for |
b7ed4bf0 CS |
546 | * the duration of the container run, to prevent the container from marking |
547 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
63fc76c3 GJ |
548 | * no name pollution is happens. |
549 | * don't unlink on NFS to avoid random named stale handles. | |
0c547523 SH |
550 | * return -1 on error. |
551 | * return -2 if nothing needed to be pinned. | |
552 | * return an open fd (>=0) if we pinned it. | |
553 | */ | |
554 | int pin_rootfs(const char *rootfs) | |
555 | { | |
957c4704 | 556 | __do_free char *absrootfs = NULL; |
0fd73091 | 557 | int fd, ret; |
6b5a54cd | 558 | char absrootfspin[PATH_MAX]; |
0c547523 | 559 | struct stat s; |
63fc76c3 | 560 | struct statfs sfs; |
0c547523 | 561 | |
e99ee0de | 562 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 563 | return -2; |
e99ee0de | 564 | |
74e7b662 | 565 | absrootfs = realpath(rootfs, NULL); |
566 | if (!absrootfs) | |
9be53773 | 567 | return -2; |
0c547523 | 568 | |
0fd73091 | 569 | ret = stat(absrootfs, &s); |
957c4704 | 570 | if (ret < 0) |
0c547523 | 571 | return -1; |
0c547523 | 572 | |
957c4704 | 573 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
574 | return -2; |
575 | ||
6b5a54cd | 576 | ret = snprintf(absrootfspin, PATH_MAX, "%s/.lxc-keep", absrootfs); |
6b5a54cd | 577 | if (ret < 0 || ret >= PATH_MAX) |
0c547523 | 578 | return -1; |
0c547523 | 579 | |
0fd73091 | 580 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR | S_IRUSR); |
b7ed4bf0 CS |
581 | if (fd < 0) |
582 | return fd; | |
0fd73091 | 583 | |
205fc010 CB |
584 | ret = fstatfs (fd, &sfs); |
585 | if (ret < 0) | |
586 | return fd; | |
63fc76c3 GJ |
587 | |
588 | if (sfs.f_type == NFS_SUPER_MAGIC) { | |
205fc010 | 589 | DEBUG("Rootfs on NFS, not unlinking pin file \"%s\"", absrootfspin); |
63fc76c3 GJ |
590 | return fd; |
591 | } | |
592 | ||
b7ed4bf0 | 593 | (void)unlink(absrootfspin); |
0fd73091 | 594 | |
0c547523 SH |
595 | return fd; |
596 | } | |
597 | ||
0fd73091 CB |
598 | /* If we are asking to remount something, make sure that any NOEXEC etc are |
599 | * honored. | |
e2a7e8dc | 600 | */ |
5ae72b98 | 601 | unsigned long add_required_remount_flags(const char *s, const char *d, |
5285689c | 602 | unsigned long flags) |
e2a7e8dc | 603 | { |
614305f3 | 604 | #ifdef HAVE_STATVFS |
0fd73091 | 605 | int ret; |
e2a7e8dc SH |
606 | struct statvfs sb; |
607 | unsigned long required_flags = 0; | |
608 | ||
e2a7e8dc SH |
609 | if (!s) |
610 | s = d; | |
611 | ||
612 | if (!s) | |
613 | return flags; | |
0fd73091 CB |
614 | |
615 | ret = statvfs(s, &sb); | |
616 | if (ret < 0) | |
e2a7e8dc SH |
617 | return flags; |
618 | ||
69eadddb CB |
619 | if (flags & MS_REMOUNT) { |
620 | if (sb.f_flag & MS_NOSUID) | |
621 | required_flags |= MS_NOSUID; | |
622 | if (sb.f_flag & MS_NODEV) | |
623 | required_flags |= MS_NODEV; | |
624 | if (sb.f_flag & MS_RDONLY) | |
625 | required_flags |= MS_RDONLY; | |
626 | if (sb.f_flag & MS_NOEXEC) | |
627 | required_flags |= MS_NOEXEC; | |
628 | } | |
629 | ||
630 | if (sb.f_flag & MS_NOATIME) | |
631 | required_flags |= MS_NOATIME; | |
632 | if (sb.f_flag & MS_NODIRATIME) | |
633 | required_flags |= MS_NODIRATIME; | |
634 | if (sb.f_flag & MS_LAZYTIME) | |
635 | required_flags |= MS_LAZYTIME; | |
636 | if (sb.f_flag & MS_RELATIME) | |
637 | required_flags |= MS_RELATIME; | |
638 | if (sb.f_flag & MS_STRICTATIME) | |
639 | required_flags |= MS_STRICTATIME; | |
e2a7e8dc SH |
640 | |
641 | return flags | required_flags; | |
614305f3 SH |
642 | #else |
643 | return flags; | |
644 | #endif | |
e2a7e8dc SH |
645 | } |
646 | ||
6b741397 CB |
647 | static int add_shmount_to_list(struct lxc_conf *conf) |
648 | { | |
6b5a54cd | 649 | char new_mount[PATH_MAX]; |
0d190408 | 650 | /* Offset for the leading '/' since the path_cont |
6b741397 CB |
651 | * is absolute inside the container. |
652 | */ | |
653 | int offset = 1, ret = -1; | |
0d190408 | 654 | |
6b741397 CB |
655 | ret = snprintf(new_mount, sizeof(new_mount), |
656 | "%s %s none bind,create=dir 0 0", conf->shmount.path_host, | |
657 | conf->shmount.path_cont + offset); | |
60534030 | 658 | if (ret < 0 || (size_t)ret >= sizeof(new_mount)) |
0d190408 LT |
659 | return -1; |
660 | ||
6b741397 | 661 | return add_elem_to_mount_list(new_mount, conf); |
0d190408 LT |
662 | } |
663 | ||
4fb3cba5 | 664 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 665 | { |
0fd73091 | 666 | int i, r; |
b06b8511 CS |
667 | static struct { |
668 | int match_mask; | |
669 | int match_flag; | |
670 | const char *source; | |
671 | const char *destination; | |
672 | const char *fstype; | |
673 | unsigned long flags; | |
674 | const char *options; | |
675 | } default_mounts[] = { | |
0fd73091 CB |
676 | /* Read-only bind-mounting... In older kernels, doing that |
677 | * required to do one MS_BIND mount and then | |
678 | * MS_REMOUNT|MS_RDONLY the same one. According to mount(2) | |
679 | * manpage, MS_BIND honors MS_RDONLY from kernel 2.6.26 | |
680 | * onwards. However, this apparently does not work on kernel | |
681 | * 3.8. Unfortunately, on that very same kernel, doing the same | |
682 | * trick as above doesn't seem to work either, there one needs | |
683 | * to ALSO specify MS_BIND for the remount, otherwise the | |
684 | * entire fs is remounted read-only or the mount fails because | |
685 | * it's busy... MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for | |
686 | * kernels as low as 2.6.32... | |
368bbc02 | 687 | */ |
0fd73091 | 688 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
592fd47a | 689 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
0fd73091 CB |
690 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL }, |
691 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, | |
692 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
693 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL }, | |
694 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, | |
695 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
696 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
697 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
698 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
699 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
d1c203f4 | 700 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys", "%r/sys", NULL, MS_BIND, NULL }, |
0fd73091 CB |
701 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, |
702 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
703 | { 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 }, | |
704 | { 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 }, | |
705 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 706 | }; |
368bbc02 | 707 | |
b06b8511 | 708 | for (i = 0; default_mounts[i].match_mask; i++) { |
8db92302 | 709 | __do_free char *destination = NULL, *source = NULL; |
0fd73091 CB |
710 | int saved_errno; |
711 | unsigned long mflags; | |
0fd73091 CB |
712 | if ((flags & default_mounts[i].match_mask) != default_mounts[i].match_flag) |
713 | continue; | |
714 | ||
715 | if (default_mounts[i].source) { | |
cc4fd506 | 716 | /* will act like strdup if %r is not present */ |
0fd73091 CB |
717 | source = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].source); |
718 | if (!source) | |
cc4fd506 | 719 | return -1; |
0fd73091 | 720 | } |
f24a52d5 | 721 | |
0fd73091 CB |
722 | if (!default_mounts[i].destination) { |
723 | ERROR("BUG: auto mounts destination %d was NULL", i); | |
0fd73091 CB |
724 | return -1; |
725 | } | |
726 | ||
727 | /* will act like strdup if %r is not present */ | |
728 | destination = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].destination); | |
729 | if (!destination) { | |
0fd73091 CB |
730 | return -1; |
731 | } | |
732 | ||
733 | mflags = add_required_remount_flags(source, destination, | |
734 | default_mounts[i].flags); | |
735 | r = safe_mount(source, destination, default_mounts[i].fstype, | |
736 | mflags, default_mounts[i].options, | |
737 | conf->rootfs.path ? conf->rootfs.mount : NULL); | |
738 | saved_errno = errno; | |
739 | if (r < 0 && errno == ENOENT) { | |
740 | INFO("Mount source or target for \"%s\" on \"%s\" does " | |
741 | "not exist. Skipping", source, destination); | |
742 | r = 0; | |
743 | } else if (r < 0) { | |
744 | SYSERROR("Failed to mount \"%s\" on \"%s\" with flags %lu", source, destination, mflags); | |
745 | } | |
746 | ||
0fd73091 CB |
747 | if (r < 0) { |
748 | errno = saved_errno; | |
749 | return -1; | |
368bbc02 | 750 | } |
368bbc02 CS |
751 | } |
752 | ||
b06b8511 | 753 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
754 | int cg_flags; |
755 | ||
3f69fb12 | 756 | cg_flags = flags & (LXC_AUTO_CGROUP_MASK & ~LXC_AUTO_CGROUP_FORCE); |
0fd73091 CB |
757 | /* If the type of cgroup mount was not specified, it depends on |
758 | * the container's capabilities as to what makes sense: if we | |
759 | * have CAP_SYS_ADMIN, the read-only part can be remounted | |
760 | * read-write anyway, so we may as well default to read-write; | |
761 | * then the admin will not be given a false sense of security. | |
762 | * (And if they really want mixed r/o r/w, then they can | |
763 | * explicitly specify :mixed.) OTOH, if the container lacks | |
764 | * CAP_SYS_ADMIN, do only default to :mixed, because then the | |
765 | * container can't remount it read-write. | |
766 | */ | |
0769b82a CS |
767 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { |
768 | int has_sys_admin = 0; | |
b0ee5983 CB |
769 | |
770 | if (!lxc_list_empty(&conf->keepcaps)) | |
0769b82a | 771 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); |
b0ee5983 | 772 | else |
0769b82a | 773 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); |
b0ee5983 CB |
774 | |
775 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) | |
0769b82a | 776 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; |
b0ee5983 | 777 | else |
0769b82a | 778 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; |
0769b82a | 779 | } |
0fd73091 | 780 | |
3f69fb12 | 781 | if (flags & LXC_AUTO_CGROUP_FORCE) |
0fd73091 CB |
782 | cg_flags |= LXC_AUTO_CGROUP_FORCE; |
783 | ||
2202afc9 CB |
784 | if (!handler->cgroup_ops->mount(handler->cgroup_ops, |
785 | handler, | |
786 | conf->rootfs.path ? conf->rootfs.mount : "", | |
787 | cg_flags)) { | |
0fd73091 | 788 | SYSERROR("Failed to mount \"/sys/fs/cgroup\""); |
b06b8511 | 789 | return -1; |
368bbc02 CS |
790 | } |
791 | } | |
792 | ||
0d190408 LT |
793 | if (flags & LXC_AUTO_SHMOUNTS_MASK) { |
794 | int ret = add_shmount_to_list(conf); | |
795 | if (ret < 0) { | |
796 | ERROR("Failed to add shmount entry to container config"); | |
6b741397 | 797 | return -1; |
0d190408 LT |
798 | } |
799 | } | |
800 | ||
368bbc02 | 801 | return 0; |
368bbc02 CS |
802 | } |
803 | ||
4e5440c6 | 804 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 805 | { |
0fd73091 CB |
806 | int ret; |
807 | ||
4e5440c6 DL |
808 | if (!utsname) |
809 | return 0; | |
0ad19a3f | 810 | |
0fd73091 CB |
811 | ret = sethostname(utsname->nodename, strlen(utsname->nodename)); |
812 | if (ret < 0) { | |
813 | SYSERROR("Failed to set the hostname to \"%s\"", utsname->nodename); | |
0ad19a3f | 814 | return -1; |
815 | } | |
816 | ||
0fd73091 | 817 | INFO("Set hostname to \"%s\"", utsname->nodename); |
cd54d859 | 818 | |
0ad19a3f | 819 | return 0; |
820 | } | |
821 | ||
69aa6655 DE |
822 | struct dev_symlinks { |
823 | const char *oldpath; | |
824 | const char *name; | |
825 | }; | |
826 | ||
827 | static const struct dev_symlinks dev_symlinks[] = { | |
0fd73091 CB |
828 | { "/proc/self/fd", "fd" }, |
829 | { "/proc/self/fd/0", "stdin" }, | |
830 | { "/proc/self/fd/1", "stdout" }, | |
831 | { "/proc/self/fd/2", "stderr" }, | |
69aa6655 DE |
832 | }; |
833 | ||
ed8704d0 | 834 | static int lxc_setup_dev_symlinks(const struct lxc_rootfs *rootfs) |
69aa6655 | 835 | { |
0fd73091 | 836 | int i, ret; |
6b5a54cd | 837 | char path[PATH_MAX]; |
09227be2 | 838 | struct stat s; |
69aa6655 | 839 | |
69aa6655 DE |
840 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { |
841 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
0fd73091 CB |
842 | |
843 | ret = snprintf(path, sizeof(path), "%s/dev/%s", | |
844 | rootfs->path ? rootfs->mount : "", d->name); | |
6b5a54cd | 845 | if (ret < 0 || ret >= PATH_MAX) |
69aa6655 | 846 | return -1; |
09227be2 | 847 | |
0fd73091 CB |
848 | /* Stat the path first. If we don't get an error accept it as |
849 | * is and don't try to create it | |
09227be2 | 850 | */ |
0fd73091 CB |
851 | ret = stat(path, &s); |
852 | if (ret == 0) | |
09227be2 | 853 | continue; |
09227be2 | 854 | |
69aa6655 DE |
855 | ret = symlink(d->oldpath, path); |
856 | if (ret && errno != EEXIST) { | |
0fd73091 CB |
857 | if (errno == EROFS) { |
858 | WARN("Failed to create \"%s\". Read-only filesystem", path); | |
09227be2 | 859 | } else { |
0fd73091 | 860 | SYSERROR("Failed to create \"%s\"", path); |
09227be2 MW |
861 | return -1; |
862 | } | |
69aa6655 DE |
863 | } |
864 | } | |
0fd73091 | 865 | |
69aa6655 DE |
866 | return 0; |
867 | } | |
868 | ||
2187efd3 | 869 | /* Build a space-separate list of ptys to pass to systemd. */ |
885766f5 | 870 | static bool append_ttyname(char **pp, char *name) |
b0a33c1e | 871 | { |
393903d1 | 872 | char *p; |
f1e05b90 | 873 | size_t size; |
393903d1 SH |
874 | |
875 | if (!*pp) { | |
876 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
877 | if (!*pp) | |
878 | return false; | |
0fd73091 | 879 | |
393903d1 SH |
880 | sprintf(*pp, "container_ttys=%s", name); |
881 | return true; | |
882 | } | |
0fd73091 | 883 | |
f1e05b90 DJ |
884 | size = strlen(*pp) + strlen(name) + 2; |
885 | p = realloc(*pp, size); | |
393903d1 SH |
886 | if (!p) |
887 | return false; | |
0fd73091 | 888 | |
393903d1 | 889 | *pp = p; |
f1e05b90 DJ |
890 | (void)strlcat(p, " ", size); |
891 | (void)strlcat(p, name, size); | |
0fd73091 | 892 | |
393903d1 SH |
893 | return true; |
894 | } | |
895 | ||
2187efd3 | 896 | static int lxc_setup_ttys(struct lxc_conf *conf) |
393903d1 | 897 | { |
9e1045e3 | 898 | int i, ret; |
0e4be3cf | 899 | const struct lxc_tty_info *ttys = &conf->ttys; |
885766f5 | 900 | char *ttydir = ttys->dir; |
6b5a54cd | 901 | char path[PATH_MAX], lxcpath[PATH_MAX]; |
b0a33c1e | 902 | |
e8bd4e43 | 903 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
904 | return 0; |
905 | ||
885766f5 | 906 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 907 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
b0a33c1e | 908 | |
e8bd4e43 | 909 | ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1); |
73363c61 | 910 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 911 | return -1; |
9e1045e3 | 912 | |
7c6ef2a2 SH |
913 | if (ttydir) { |
914 | /* create dev/lxc/tty%d" */ | |
9e1045e3 CB |
915 | ret = snprintf(lxcpath, sizeof(lxcpath), |
916 | "/dev/%s/tty%d", ttydir, i + 1); | |
73363c61 | 917 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
7c6ef2a2 | 918 | return -1; |
9e1045e3 | 919 | |
adc1c715 | 920 | ret = mknod(lxcpath, S_IFREG | 0000, 0); |
9e1045e3 | 921 | if (ret < 0 && errno != EEXIST) { |
73363c61 | 922 | SYSERROR("Failed to create \"%s\"", lxcpath); |
7c6ef2a2 SH |
923 | return -1; |
924 | } | |
9e1045e3 | 925 | |
7c6ef2a2 | 926 | ret = unlink(path); |
9e1045e3 | 927 | if (ret < 0 && errno != ENOENT) { |
73363c61 | 928 | SYSERROR("Failed to unlink \"%s\"", path); |
7c6ef2a2 SH |
929 | return -1; |
930 | } | |
b0a33c1e | 931 | |
2520facd | 932 | ret = mount(tty->name, lxcpath, "none", MS_BIND, 0); |
9e1045e3 | 933 | if (ret < 0) { |
adc1c715 WB |
934 | SYSWARN("Failed to bind mount \"%s\" onto \"%s\"", |
935 | tty->name, lxcpath); | |
7c6ef2a2 SH |
936 | continue; |
937 | } | |
0fd73091 | 938 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, |
adc1c715 | 939 | lxcpath); |
13954cce | 940 | |
9e1045e3 CB |
941 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", |
942 | ttydir, i + 1); | |
73363c61 | 943 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
9ba8130c | 944 | return -1; |
9e1045e3 | 945 | |
7c6ef2a2 | 946 | ret = symlink(lxcpath, path); |
9e1045e3 | 947 | if (ret < 0) { |
73363c61 | 948 | SYSERROR("Failed to create symlink \"%s\" -> \"%s\"", |
9e1045e3 | 949 | path, lxcpath); |
7c6ef2a2 SH |
950 | return -1; |
951 | } | |
952 | } else { | |
9e1045e3 CB |
953 | /* If we populated /dev, then we need to create |
954 | * /dev/ttyN | |
955 | */ | |
d3ccc04e CB |
956 | ret = mknod(path, S_IFREG | 0000, 0); |
957 | if (ret < 0) /* this isn't fatal, continue */ | |
6d1400b5 | 958 | SYSERROR("Failed to create \"%s\"", path); |
9e1045e3 | 959 | |
2520facd | 960 | ret = mount(tty->name, path, "none", MS_BIND, 0); |
9e1045e3 | 961 | if (ret < 0) { |
2520facd | 962 | SYSERROR("Failed to mount '%s'->'%s'", tty->name, path); |
7c6ef2a2 SH |
963 | continue; |
964 | } | |
9e1045e3 | 965 | |
d3ccc04e | 966 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, path); |
393903d1 | 967 | } |
9e1045e3 | 968 | |
885766f5 | 969 | if (!append_ttyname(&conf->ttys.tty_names, tty->name)) { |
393903d1 SH |
970 | ERROR("Error setting up container_ttys string"); |
971 | return -1; | |
b0a33c1e | 972 | } |
973 | } | |
974 | ||
885766f5 | 975 | INFO("Finished setting up %zu /dev/tty<N> device(s)", ttys->max); |
b0a33c1e | 976 | return 0; |
977 | } | |
978 | ||
663014ee | 979 | int lxc_allocate_ttys(struct lxc_conf *conf) |
2187efd3 | 980 | { |
fca23691 | 981 | size_t i; |
982 | int ret; | |
0fd73091 | 983 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 CB |
984 | |
985 | /* no tty in the configuration */ | |
885766f5 | 986 | if (ttys->max == 0) |
2187efd3 CB |
987 | return 0; |
988 | ||
885766f5 | 989 | ttys->tty = malloc(sizeof(*ttys->tty) * ttys->max); |
0e4be3cf | 990 | if (!ttys->tty) |
2187efd3 | 991 | return -ENOMEM; |
2187efd3 | 992 | |
885766f5 | 993 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 994 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 995 | |
386e6768 CB |
996 | tty->master = -EBADF; |
997 | tty->slave = -EBADF; | |
77a39805 CB |
998 | ret = openpty(&tty->master, &tty->slave, NULL, NULL, NULL); |
999 | if (ret < 0) { | |
fca23691 | 1000 | SYSERROR("Failed to create tty %zu", i); |
885766f5 | 1001 | ttys->max = i; |
0e4be3cf | 1002 | lxc_delete_tty(ttys); |
2187efd3 CB |
1003 | return -ENOTTY; |
1004 | } | |
1005 | ||
77a39805 CB |
1006 | ret = ttyname_r(tty->slave, tty->name, sizeof(tty->name)); |
1007 | if (ret < 0) { | |
fca23691 | 1008 | SYSERROR("Failed to retrieve name of tty %zu slave", i); |
77a39805 CB |
1009 | ttys->max = i; |
1010 | lxc_delete_tty(ttys); | |
1011 | return -ENOTTY; | |
1012 | } | |
1013 | ||
0fd73091 | 1014 | DEBUG("Created tty \"%s\" with master fd %d and slave fd %d", |
2520facd | 1015 | tty->name, tty->master, tty->slave); |
2187efd3 CB |
1016 | |
1017 | /* Prevent leaking the file descriptors to the container */ | |
615f24ff | 1018 | ret = fd_cloexec(tty->master, true); |
2187efd3 | 1019 | if (ret < 0) |
a24c5678 | 1020 | SYSWARN("Failed to set FD_CLOEXEC flag on master fd %d of " |
1021 | "tty device \"%s\"", tty->master, tty->name); | |
2187efd3 | 1022 | |
615f24ff | 1023 | ret = fd_cloexec(tty->slave, true); |
2187efd3 | 1024 | if (ret < 0) |
a24c5678 | 1025 | SYSWARN("Failed to set FD_CLOEXEC flag on slave fd %d of " |
1026 | "tty device \"%s\"", tty->slave, tty->name); | |
2187efd3 | 1027 | |
2520facd | 1028 | tty->busy = 0; |
2187efd3 CB |
1029 | } |
1030 | ||
885766f5 | 1031 | INFO("Finished creating %zu tty devices", ttys->max); |
2187efd3 CB |
1032 | return 0; |
1033 | } | |
1034 | ||
0e4be3cf | 1035 | void lxc_delete_tty(struct lxc_tty_info *ttys) |
2187efd3 CB |
1036 | { |
1037 | int i; | |
1038 | ||
386e6768 CB |
1039 | if (!ttys->tty) |
1040 | return; | |
1041 | ||
885766f5 | 1042 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 1043 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1044 | |
386e6768 CB |
1045 | if (tty->master >= 0) { |
1046 | close(tty->master); | |
1047 | tty->master = -EBADF; | |
1048 | } | |
1049 | ||
1050 | if (tty->slave >= 0) { | |
1051 | close(tty->slave); | |
1052 | tty->slave = -EBADF; | |
1053 | } | |
2187efd3 CB |
1054 | } |
1055 | ||
0e4be3cf CB |
1056 | free(ttys->tty); |
1057 | ttys->tty = NULL; | |
2187efd3 CB |
1058 | } |
1059 | ||
1060 | static int lxc_send_ttys_to_parent(struct lxc_handler *handler) | |
1061 | { | |
1062 | int i; | |
0fd73091 | 1063 | int ret = -1; |
2187efd3 | 1064 | struct lxc_conf *conf = handler->conf; |
0e4be3cf | 1065 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 | 1066 | int sock = handler->data_sock[0]; |
2187efd3 | 1067 | |
885766f5 | 1068 | if (ttys->max == 0) |
2187efd3 CB |
1069 | return 0; |
1070 | ||
885766f5 | 1071 | for (i = 0; i < ttys->max; i++) { |
2187efd3 | 1072 | int ttyfds[2]; |
0e4be3cf | 1073 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1074 | |
2520facd CB |
1075 | ttyfds[0] = tty->master; |
1076 | ttyfds[1] = tty->slave; | |
2187efd3 CB |
1077 | |
1078 | ret = lxc_abstract_unix_send_fds(sock, ttyfds, 2, NULL, 0); | |
1079 | if (ret < 0) | |
1080 | break; | |
1081 | ||
7d7333b3 | 1082 | TRACE("Sent tty \"%s\" with master fd %d and slave fd %d to " |
2520facd | 1083 | "parent", tty->name, tty->master, tty->slave); |
2187efd3 CB |
1084 | } |
1085 | ||
1086 | if (ret < 0) | |
6d1400b5 | 1087 | SYSERROR("Failed to send %zu ttys to parent", ttys->max); |
2187efd3 | 1088 | else |
885766f5 | 1089 | TRACE("Sent %zu ttys to parent", ttys->max); |
2187efd3 CB |
1090 | |
1091 | return ret; | |
1092 | } | |
1093 | ||
1094 | static int lxc_create_ttys(struct lxc_handler *handler) | |
1095 | { | |
1096 | int ret = -1; | |
1097 | struct lxc_conf *conf = handler->conf; | |
1098 | ||
663014ee | 1099 | ret = lxc_allocate_ttys(conf); |
2187efd3 CB |
1100 | if (ret < 0) { |
1101 | ERROR("Failed to allocate ttys"); | |
1102 | goto on_error; | |
1103 | } | |
1104 | ||
1105 | ret = lxc_send_ttys_to_parent(handler); | |
1106 | if (ret < 0) { | |
1107 | ERROR("Failed to send ttys to parent"); | |
1108 | goto on_error; | |
1109 | } | |
1110 | ||
1111 | if (!conf->is_execute) { | |
1112 | ret = lxc_setup_ttys(conf); | |
1113 | if (ret < 0) { | |
1114 | ERROR("Failed to setup ttys"); | |
1115 | goto on_error; | |
1116 | } | |
1117 | } | |
1118 | ||
885766f5 CB |
1119 | if (conf->ttys.tty_names) { |
1120 | ret = setenv("container_ttys", conf->ttys.tty_names, 1); | |
2187efd3 | 1121 | if (ret < 0) |
885766f5 | 1122 | SYSERROR("Failed to set \"container_ttys=%s\"", conf->ttys.tty_names); |
2187efd3 CB |
1123 | } |
1124 | ||
1125 | ret = 0; | |
1126 | ||
1127 | on_error: | |
0e4be3cf | 1128 | lxc_delete_tty(&conf->ttys); |
2187efd3 CB |
1129 | |
1130 | return ret; | |
1131 | } | |
1132 | ||
7133b912 CB |
1133 | /* Just create a path for /dev under $lxcpath/$name and in rootfs If we hit an |
1134 | * error, log it but don't fail yet. | |
91c3830e | 1135 | */ |
7133b912 CB |
1136 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, |
1137 | const char *lxcpath) | |
91c3830e | 1138 | { |
2f443e88 | 1139 | __do_free char *path = NULL; |
91c3830e | 1140 | int ret; |
87da4ec3 | 1141 | size_t clen; |
87e0e273 | 1142 | mode_t cur_mask; |
91c3830e | 1143 | |
7133b912 | 1144 | INFO("Preparing \"/dev\""); |
bc6928ff | 1145 | |
14221cbb | 1146 | /* $(rootfs->mount) + "/dev/pts" + '\0' */ |
ec50007f | 1147 | clen = (rootfs->path ? strlen(rootfs->mount) : 0) + 9; |
2f443e88 | 1148 | path = must_realloc(NULL, clen); |
bc6928ff | 1149 | |
ec50007f | 1150 | ret = snprintf(path, clen, "%s/dev", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1151 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1152 | return -1; |
bc6928ff | 1153 | |
87e0e273 CB |
1154 | cur_mask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
1155 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
1156 | if (ret < 0 && errno != EEXIST) { | |
1157 | SYSERROR("Failed to create \"/dev\" directory"); | |
1158 | ret = -errno; | |
1159 | goto reset_umask; | |
bc6928ff | 1160 | } |
87da4ec3 | 1161 | |
1ec0e8e3 | 1162 | ret = safe_mount("none", path, "tmpfs", 0, "size=500000,mode=755", |
7133b912 CB |
1163 | rootfs->path ? rootfs->mount : NULL); |
1164 | if (ret < 0) { | |
1165 | SYSERROR("Failed to mount tmpfs on \"%s\"", path); | |
87e0e273 | 1166 | goto reset_umask; |
91c3830e | 1167 | } |
87e0e273 | 1168 | TRACE("Mounted tmpfs on \"%s\"", path); |
87da4ec3 | 1169 | |
ec50007f | 1170 | ret = snprintf(path, clen, "%s/dev/pts", rootfs->path ? rootfs->mount : ""); |
87e0e273 CB |
1171 | if (ret < 0 || (size_t)ret >= clen) { |
1172 | ret = -1; | |
1173 | goto reset_umask; | |
1174 | } | |
87da4ec3 | 1175 | |
7133b912 | 1176 | /* If we are running on a devtmpfs mapping, dev/pts may already exist. |
bc6928ff MW |
1177 | * If not, then create it and exit if that fails... |
1178 | */ | |
87e0e273 CB |
1179 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
1180 | if (ret < 0 && errno != EEXIST) { | |
1181 | SYSERROR("Failed to create directory \"%s\"", path); | |
1182 | ret = -errno; | |
1183 | goto reset_umask; | |
91c3830e SH |
1184 | } |
1185 | ||
87e0e273 CB |
1186 | ret = 0; |
1187 | ||
1188 | reset_umask: | |
1189 | (void)umask(cur_mask); | |
1190 | ||
7133b912 | 1191 | INFO("Prepared \"/dev\""); |
87e0e273 | 1192 | return ret; |
91c3830e SH |
1193 | } |
1194 | ||
5e73416f | 1195 | struct lxc_device_node { |
74a3920a | 1196 | const char *name; |
5e73416f CB |
1197 | const mode_t mode; |
1198 | const int maj; | |
1199 | const int min; | |
c6883f38 SH |
1200 | }; |
1201 | ||
5e73416f | 1202 | static const struct lxc_device_node lxc_devices[] = { |
06749971 | 1203 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, |
5e73416f | 1204 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
06749971 CB |
1205 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, |
1206 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
5e73416f CB |
1207 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, |
1208 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
c6883f38 SH |
1209 | }; |
1210 | ||
5067e4dd CB |
1211 | |
1212 | enum { | |
1213 | LXC_DEVNODE_BIND, | |
1214 | LXC_DEVNODE_MKNOD, | |
1215 | LXC_DEVNODE_PARTIAL, | |
1216 | LXC_DEVNODE_OPEN, | |
1217 | }; | |
1218 | ||
27245ff7 | 1219 | static int lxc_fill_autodev(const struct lxc_rootfs *rootfs) |
c6883f38 | 1220 | { |
5e73416f | 1221 | int i, ret; |
6b5a54cd | 1222 | char path[PATH_MAX]; |
3a32201c | 1223 | mode_t cmask; |
5067e4dd | 1224 | int use_mknod = LXC_DEVNODE_MKNOD; |
c6883f38 | 1225 | |
6b5a54cd | 1226 | ret = snprintf(path, PATH_MAX, "%s/dev", |
3999be0a | 1227 | rootfs->path ? rootfs->mount : ""); |
6b5a54cd | 1228 | if (ret < 0 || ret >= PATH_MAX) |
c6883f38 | 1229 | return -1; |
91c3830e | 1230 | |
0bbf8572 CB |
1231 | /* ignore, just don't try to fill in */ |
1232 | if (!dir_exists(path)) | |
9cb4d183 SH |
1233 | return 0; |
1234 | ||
3999be0a CB |
1235 | INFO("Populating \"/dev\""); |
1236 | ||
3a32201c | 1237 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
5e73416f | 1238 | for (i = 0; i < sizeof(lxc_devices) / sizeof(lxc_devices[0]); i++) { |
6b5a54cd | 1239 | char hostpath[PATH_MAX]; |
5e73416f | 1240 | const struct lxc_device_node *device = &lxc_devices[i]; |
0728ebf4 | 1241 | |
6b5a54cd | 1242 | ret = snprintf(path, PATH_MAX, "%s/dev/%s", |
5e73416f | 1243 | rootfs->path ? rootfs->mount : "", device->name); |
6b5a54cd | 1244 | if (ret < 0 || ret >= PATH_MAX) |
c6883f38 | 1245 | return -1; |
0bbf8572 | 1246 | |
5067e4dd | 1247 | if (use_mknod >= LXC_DEVNODE_MKNOD) { |
5e73416f CB |
1248 | ret = mknod(path, device->mode, makedev(device->maj, device->min)); |
1249 | if (ret == 0 || (ret < 0 && errno == EEXIST)) { | |
1250 | DEBUG("Created device node \"%s\"", path); | |
5067e4dd CB |
1251 | } else if (ret < 0) { |
1252 | if (errno != EPERM) { | |
1253 | SYSERROR("Failed to create device node \"%s\"", path); | |
1254 | return -1; | |
1255 | } | |
0bbf8572 | 1256 | |
5067e4dd | 1257 | use_mknod = LXC_DEVNODE_BIND; |
9cb4d183 | 1258 | } |
3999be0a | 1259 | |
5067e4dd CB |
1260 | /* Device nodes are fully useable. */ |
1261 | if (use_mknod == LXC_DEVNODE_OPEN) | |
1262 | continue; | |
1263 | ||
1264 | if (use_mknod == LXC_DEVNODE_MKNOD) { | |
1265 | /* See | |
1266 | * - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=55956b59df336f6738da916dbb520b6e37df9fbd | |
1267 | * - https://lists.linuxfoundation.org/pipermail/containers/2018-June/039176.html | |
1268 | */ | |
1269 | ret = open(path, O_RDONLY | O_CLOEXEC); | |
1270 | if (ret >= 0) { | |
ae2a3d81 | 1271 | close_prot_errno_disarm(ret); |
5067e4dd CB |
1272 | /* Device nodes are fully useable. */ |
1273 | use_mknod = LXC_DEVNODE_OPEN; | |
1274 | continue; | |
1275 | } | |
1276 | ||
1277 | SYSTRACE("Failed to open \"%s\" device", path); | |
1278 | /* Device nodes are only partially useable. */ | |
1279 | use_mknod = LXC_DEVNODE_PARTIAL; | |
1280 | } | |
5e73416f CB |
1281 | } |
1282 | ||
5067e4dd CB |
1283 | if (use_mknod != LXC_DEVNODE_PARTIAL) { |
1284 | /* If we are dealing with partially functional device | |
1285 | * nodes the prio mknod() call will have created the | |
1286 | * device node so we can use it as a bind-mount target. | |
1287 | */ | |
1288 | ret = mknod(path, S_IFREG | 0000, 0); | |
1289 | if (ret < 0 && errno != EEXIST) { | |
1290 | SYSERROR("Failed to create file \"%s\"", path); | |
1291 | return -1; | |
1292 | } | |
5e73416f CB |
1293 | } |
1294 | ||
1295 | /* Fallback to bind-mounting the device from the host. */ | |
6b5a54cd CB |
1296 | ret = snprintf(hostpath, PATH_MAX, "/dev/%s", device->name); |
1297 | if (ret < 0 || ret >= PATH_MAX) | |
5e73416f CB |
1298 | return -1; |
1299 | ||
1300 | ret = safe_mount(hostpath, path, 0, MS_BIND, NULL, | |
1301 | rootfs->path ? rootfs->mount : NULL); | |
1302 | if (ret < 0) { | |
1303 | SYSERROR("Failed to bind mount host device node \"%s\" " | |
1304 | "onto \"%s\"", hostpath, path); | |
1305 | return -1; | |
c6883f38 | 1306 | } |
5e73416f CB |
1307 | DEBUG("Bind mounted host device node \"%s\" onto \"%s\"", |
1308 | hostpath, path); | |
c6883f38 | 1309 | } |
5e73416f | 1310 | (void)umask(cmask); |
c6883f38 | 1311 | |
3999be0a | 1312 | INFO("Populated \"/dev\""); |
c6883f38 SH |
1313 | return 0; |
1314 | } | |
1315 | ||
8ce1abc2 | 1316 | static int lxc_mount_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1317 | { |
9aa76a17 | 1318 | int ret; |
10bc1861 | 1319 | struct lxc_storage *bdev; |
8ce1abc2 | 1320 | const struct lxc_rootfs *rootfs = &conf->rootfs; |
cc28d0b0 | 1321 | |
a0f379bf | 1322 | if (!rootfs->path) { |
0fd73091 CB |
1323 | ret = mount("", "/", NULL, MS_SLAVE | MS_REC, 0); |
1324 | if (ret < 0) { | |
8ce1abc2 | 1325 | SYSERROR("Failed to remount \"/\" MS_REC | MS_SLAVE"); |
a0f379bf DW |
1326 | return -1; |
1327 | } | |
0fd73091 | 1328 | |
c69bd12f | 1329 | return 0; |
a0f379bf | 1330 | } |
0ad19a3f | 1331 | |
0fd73091 CB |
1332 | ret = access(rootfs->mount, F_OK); |
1333 | if (ret != 0) { | |
1334 | SYSERROR("Failed to access to \"%s\". Check it is present", | |
12297168 | 1335 | rootfs->mount); |
b1789442 DL |
1336 | return -1; |
1337 | } | |
1338 | ||
8a388ed4 | 1339 | bdev = storage_init(conf); |
9aa76a17 | 1340 | if (!bdev) { |
0fd73091 | 1341 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1342 | rootfs->path, rootfs->mount, |
1343 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1344 | return -1; |
9be53773 | 1345 | } |
9aa76a17 CB |
1346 | |
1347 | ret = bdev->ops->mount(bdev); | |
10bc1861 | 1348 | storage_put(bdev); |
9aa76a17 | 1349 | if (ret < 0) { |
0fd73091 | 1350 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1351 | rootfs->path, rootfs->mount, |
1352 | rootfs->options ? rootfs->options : "(null)"); | |
c3f0a28c | 1353 | return -1; |
1354 | } | |
0ad19a3f | 1355 | |
0fd73091 | 1356 | DEBUG("Mounted rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1357 | rootfs->path, rootfs->mount, |
1358 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1359 | |
ac778708 DL |
1360 | return 0; |
1361 | } | |
1362 | ||
8ce1abc2 | 1363 | int lxc_chroot(const struct lxc_rootfs *rootfs) |
91e93c71 | 1364 | { |
b8d88764 | 1365 | __do_free char *nroot = NULL; |
0fd73091 | 1366 | int i, ret; |
8ce1abc2 | 1367 | char *root = rootfs->mount; |
91e93c71 | 1368 | |
74e7b662 | 1369 | nroot = realpath(root, NULL); |
1370 | if (!nroot) { | |
8ce1abc2 | 1371 | SYSERROR("Failed to resolve \"%s\"", root); |
0fd73091 | 1372 | return -1; |
8ce1abc2 | 1373 | } |
91e93c71 | 1374 | |
0fd73091 | 1375 | ret = chdir("/"); |
b8d88764 | 1376 | if (ret < 0) |
0fd73091 | 1377 | return -1; |
91e93c71 | 1378 | |
0fd73091 CB |
1379 | /* We could use here MS_MOVE, but in userns this mount is locked and |
1380 | * can't be moved. | |
91e93c71 | 1381 | */ |
8ce1abc2 | 1382 | ret = mount(nroot, "/", NULL, MS_REC | MS_BIND, NULL); |
0fd73091 | 1383 | if (ret < 0) { |
8ce1abc2 | 1384 | SYSERROR("Failed to mount \"%s\" onto \"/\" as MS_REC | MS_BIND", nroot); |
0fd73091 | 1385 | return -1; |
91e93c71 AV |
1386 | } |
1387 | ||
0fd73091 CB |
1388 | ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL); |
1389 | if (ret < 0) { | |
8ce1abc2 | 1390 | SYSERROR("Failed to remount \"/\""); |
0fd73091 | 1391 | return -1; |
91e93c71 AV |
1392 | } |
1393 | ||
aa899945 | 1394 | /* The following code cleans up inherited mounts which are not required |
0fd73091 | 1395 | * for CT. |
91e93c71 AV |
1396 | * |
1397 | * The mountinfo file shows not all mounts, if a few points have been | |
1398 | * unmounted between read operations from the mountinfo. So we need to | |
1399 | * read mountinfo a few times. | |
1400 | * | |
7ded5fa7 | 1401 | * This loop can be skipped if a container uses userns, because all |
91e93c71 AV |
1402 | * inherited mounts are locked and we should live with all this trash. |
1403 | */ | |
0fd73091 | 1404 | for (;;) { |
4fdd1f72 | 1405 | __do_fclose FILE *f = NULL; |
f3d38164 CB |
1406 | __do_free char *line = NULL; |
1407 | char *slider1, *slider2; | |
91e93c71 | 1408 | int progress = 0; |
f3d38164 | 1409 | size_t len = 0; |
91e93c71 AV |
1410 | |
1411 | f = fopen("./proc/self/mountinfo", "r"); | |
1412 | if (!f) { | |
8ce1abc2 | 1413 | SYSERROR("Failed to open \"/proc/self/mountinfo\""); |
91e93c71 AV |
1414 | return -1; |
1415 | } | |
0fd73091 | 1416 | |
f3d38164 CB |
1417 | while (getline(&line, &len, f) > 0) { |
1418 | for (slider1 = line, i = 0; slider1 && i < 4; i++) | |
1419 | slider1 = strchr(slider1 + 1, ' '); | |
0fd73091 | 1420 | |
f3d38164 | 1421 | if (!slider1) |
91e93c71 | 1422 | continue; |
0fd73091 | 1423 | |
f3d38164 CB |
1424 | slider2 = strchr(slider1 + 1, ' '); |
1425 | if (!slider2) | |
91e93c71 AV |
1426 | continue; |
1427 | ||
f3d38164 CB |
1428 | *slider2 = '\0'; |
1429 | *slider1 = '.'; | |
91e93c71 | 1430 | |
f3d38164 | 1431 | if (strcmp(slider1 + 1, "/") == 0) |
91e93c71 | 1432 | continue; |
0fd73091 | 1433 | |
f3d38164 | 1434 | if (strcmp(slider1 + 1, "/proc") == 0) |
91e93c71 AV |
1435 | continue; |
1436 | ||
f3d38164 | 1437 | ret = umount2(slider1, MNT_DETACH); |
0fd73091 | 1438 | if (ret == 0) |
91e93c71 AV |
1439 | progress++; |
1440 | } | |
0fd73091 | 1441 | |
91e93c71 AV |
1442 | if (!progress) |
1443 | break; | |
1444 | } | |
1445 | ||
7ded5fa7 | 1446 | /* This also can be skipped if a container uses userns. */ |
0fd73091 | 1447 | (void)umount2("./proc", MNT_DETACH); |
91e93c71 AV |
1448 | |
1449 | /* It is weird, but chdir("..") moves us in a new root */ | |
0fd73091 CB |
1450 | ret = chdir(".."); |
1451 | if (ret < 0) { | |
8ce1abc2 | 1452 | SYSERROR("Failed to chdir(\"..\")"); |
91e93c71 AV |
1453 | return -1; |
1454 | } | |
1455 | ||
0fd73091 CB |
1456 | ret = chroot("."); |
1457 | if (ret < 0) { | |
8ce1abc2 | 1458 | SYSERROR("Failed to chroot(\".\")"); |
91e93c71 AV |
1459 | return -1; |
1460 | } | |
1461 | ||
1462 | return 0; | |
1463 | } | |
1464 | ||
8ce1abc2 CB |
1465 | /* (The following explanation is copied verbatim from the kernel.) |
1466 | * | |
1467 | * pivot_root Semantics: | |
1468 | * Moves the root file system of the current process to the directory put_old, | |
1469 | * makes new_root as the new root file system of the current process, and sets | |
1470 | * root/cwd of all processes which had them on the current root to new_root. | |
1471 | * | |
1472 | * Restrictions: | |
1473 | * The new_root and put_old must be directories, and must not be on the | |
1474 | * same file system as the current process root. The put_old must be | |
1475 | * underneath new_root, i.e. adding a non-zero number of /.. to the string | |
1476 | * pointed to by put_old must yield the same directory as new_root. No other | |
1477 | * file system may be mounted on put_old. After all, new_root is a mountpoint. | |
1478 | * | |
1479 | * Also, the current root cannot be on the 'rootfs' (initial ramfs) filesystem. | |
1480 | * See Documentation/filesystems/ramfs-rootfs-initramfs.txt for alternatives | |
1481 | * in this situation. | |
1482 | * | |
1483 | * Notes: | |
1484 | * - we don't move root/cwd if they are not at the root (reason: if something | |
1485 | * cared enough to change them, it's probably wrong to force them elsewhere) | |
1486 | * - it's okay to pick a root that isn't the root of a file system, e.g. | |
1487 | * /nfs/my_root where /nfs is the mount point. It must be a mountpoint, | |
1488 | * though, so you may need to say mount --bind /nfs/my_root /nfs/my_root | |
1489 | * first. | |
1490 | */ | |
1491 | static int lxc_pivot_root(const char *rootfs) | |
ac778708 | 1492 | { |
b0d7aac4 CB |
1493 | __do_close_prot_errno int oldroot = -EBADF, newroot = -EBADF; |
1494 | int ret; | |
0fd73091 | 1495 | |
7806ebd7 | 1496 | oldroot = open("/", O_DIRECTORY | O_RDONLY | O_CLOEXEC); |
8ce1abc2 CB |
1497 | if (oldroot < 0) { |
1498 | SYSERROR("Failed to open old root directory"); | |
1499 | return -1; | |
39c7b795 | 1500 | } |
ac778708 | 1501 | |
7806ebd7 | 1502 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY | O_CLOEXEC); |
8ce1abc2 CB |
1503 | if (newroot < 0) { |
1504 | SYSERROR("Failed to open new root directory"); | |
b0d7aac4 | 1505 | return -1; |
8ce1abc2 | 1506 | } |
0fd73091 | 1507 | |
8ce1abc2 CB |
1508 | /* change into new root fs */ |
1509 | ret = fchdir(newroot); | |
1510 | if (ret < 0) { | |
8ce1abc2 | 1511 | SYSERROR("Failed to change to new rootfs \"%s\"", rootfs); |
b0d7aac4 | 1512 | return -1; |
8ce1abc2 | 1513 | } |
39c7b795 | 1514 | |
8ce1abc2 CB |
1515 | /* pivot_root into our new root fs */ |
1516 | ret = pivot_root(".", "."); | |
1517 | if (ret < 0) { | |
8ce1abc2 | 1518 | SYSERROR("Failed to pivot_root()"); |
b0d7aac4 | 1519 | return -1; |
39c7b795 CB |
1520 | } |
1521 | ||
8ce1abc2 CB |
1522 | /* At this point the old-root is mounted on top of our new-root. To |
1523 | * unmounted it we must not be chdir'd into it, so escape back to | |
1524 | * old-root. | |
1525 | */ | |
1526 | ret = fchdir(oldroot); | |
0fd73091 | 1527 | if (ret < 0) { |
8ce1abc2 | 1528 | SYSERROR("Failed to enter old root directory"); |
b0d7aac4 | 1529 | return -1; |
c69bd12f DL |
1530 | } |
1531 | ||
8ce1abc2 CB |
1532 | /* Make oldroot rslave to make sure our umounts don't propagate to the |
1533 | * host. | |
1534 | */ | |
1535 | ret = mount("", ".", "", MS_SLAVE | MS_REC, NULL); | |
1536 | if (ret < 0) { | |
8ce1abc2 | 1537 | SYSERROR("Failed to make oldroot rslave"); |
b0d7aac4 | 1538 | return -1; |
8ce1abc2 CB |
1539 | } |
1540 | ||
1541 | ret = umount2(".", MNT_DETACH); | |
1542 | if (ret < 0) { | |
8ce1abc2 | 1543 | SYSERROR("Failed to detach old root directory"); |
b0d7aac4 | 1544 | return -1; |
8ce1abc2 CB |
1545 | } |
1546 | ||
1547 | ret = fchdir(newroot); | |
1548 | if (ret < 0) { | |
8ce1abc2 | 1549 | SYSERROR("Failed to re-enter new root directory"); |
b0d7aac4 | 1550 | return -1; |
8ce1abc2 CB |
1551 | } |
1552 | ||
8ce1abc2 CB |
1553 | TRACE("pivot_root(\"%s\") successful", rootfs); |
1554 | ||
b0d7aac4 | 1555 | return 0; |
0ad19a3f | 1556 | } |
1557 | ||
8ce1abc2 CB |
1558 | static int lxc_setup_rootfs_switch_root(const struct lxc_rootfs *rootfs) |
1559 | { | |
1560 | if (!rootfs->path) { | |
1561 | DEBUG("Container does not have a rootfs"); | |
1562 | return 0; | |
1563 | } | |
1564 | ||
1565 | if (detect_ramfs_rootfs()) | |
1566 | return lxc_chroot(rootfs); | |
1567 | ||
1568 | return lxc_pivot_root(rootfs->mount); | |
0ad19a3f | 1569 | } |
1570 | ||
8ce1abc2 CB |
1571 | static const struct id_map *find_mapped_nsid_entry(struct lxc_conf *conf, |
1572 | unsigned id, | |
1573 | enum idtype idtype) | |
f4900711 CB |
1574 | { |
1575 | struct lxc_list *it; | |
1576 | struct id_map *map; | |
1577 | struct id_map *retmap = NULL; | |
1578 | ||
dcf0ffdf CB |
1579 | /* Shortcut for container's root mappings. */ |
1580 | if (id == 0) { | |
1581 | if (idtype == ID_TYPE_UID) | |
1582 | return conf->root_nsuid_map; | |
1583 | ||
1584 | if (idtype == ID_TYPE_GID) | |
1585 | return conf->root_nsgid_map; | |
1586 | } | |
1587 | ||
f4900711 CB |
1588 | lxc_list_for_each(it, &conf->id_map) { |
1589 | map = it->elem; | |
1590 | if (map->idtype != idtype) | |
1591 | continue; | |
1592 | ||
1593 | if (id >= map->nsid && id < map->nsid + map->range) { | |
1594 | retmap = map; | |
1595 | break; | |
1596 | } | |
1597 | } | |
1598 | ||
1599 | return retmap; | |
1600 | } | |
1601 | ||
1602 | static int lxc_setup_devpts(struct lxc_conf *conf) | |
3c26f34e | 1603 | { |
70761e5e | 1604 | int ret; |
ce155c60 | 1605 | char **opts; |
9d28c4f9 | 1606 | char devpts_mntopts[256]; |
ce155c60 CB |
1607 | char *mntopt_sets[5]; |
1608 | char default_devpts_mntopts[256] = "gid=5,newinstance,ptmxmode=0666,mode=0620"; | |
77890c6d | 1609 | |
e528c735 | 1610 | if (conf->pty_max <= 0) { |
0fd73091 | 1611 | DEBUG("No new devpts instance will be mounted since no pts " |
70761e5e | 1612 | "devices are requested"); |
d852c78c | 1613 | return 0; |
3c26f34e | 1614 | } |
1615 | ||
e528c735 CB |
1616 | ret = snprintf(devpts_mntopts, sizeof(devpts_mntopts), "%s,max=%zu", |
1617 | default_devpts_mntopts, conf->pty_max); | |
9d28c4f9 CB |
1618 | if (ret < 0 || (size_t)ret >= sizeof(devpts_mntopts)) |
1619 | return -1; | |
1620 | ||
29a7b484 | 1621 | (void)umount2("/dev/pts", MNT_DETACH); |
7e40254a | 1622 | |
70761e5e CB |
1623 | /* Create mountpoint for devpts instance. */ |
1624 | ret = mkdir("/dev/pts", 0755); | |
1625 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1626 | SYSERROR("Failed to create \"/dev/pts\" directory"); |
3c26f34e | 1627 | return -1; |
1628 | } | |
1629 | ||
ce155c60 CB |
1630 | /* gid=5 && max= */ |
1631 | mntopt_sets[0] = devpts_mntopts; | |
dfbd4730 | 1632 | |
ce155c60 | 1633 | /* !gid=5 && max= */ |
6333c915 | 1634 | mntopt_sets[1] = devpts_mntopts + STRLITERALLEN("gid=5") + 1; |
ce155c60 CB |
1635 | |
1636 | /* gid=5 && !max= */ | |
1637 | mntopt_sets[2] = default_devpts_mntopts; | |
1638 | ||
1639 | /* !gid=5 && !max= */ | |
6333c915 | 1640 | mntopt_sets[3] = default_devpts_mntopts + STRLITERALLEN("gid=5") + 1; |
ce155c60 CB |
1641 | |
1642 | /* end */ | |
1643 | mntopt_sets[4] = NULL; | |
1644 | ||
1645 | for (ret = -1, opts = mntopt_sets; opts && *opts; opts++) { | |
1646 | /* mount new devpts instance */ | |
1647 | ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, *opts); | |
1648 | if (ret == 0) | |
1649 | break; | |
1650 | } | |
1651 | ||
1652 | if (ret < 0) { | |
1653 | SYSERROR("Failed to mount new devpts instance"); | |
1654 | return -1; | |
70761e5e | 1655 | } |
ce155c60 | 1656 | DEBUG("Mount new devpts instance with options \"%s\"", *opts); |
70761e5e | 1657 | |
d5cb35d6 | 1658 | /* Remove any pre-existing /dev/ptmx file. */ |
b29e05d6 CB |
1659 | ret = remove("/dev/ptmx"); |
1660 | if (ret < 0) { | |
1661 | if (errno != ENOENT) { | |
0fd73091 | 1662 | SYSERROR("Failed to remove existing \"/dev/ptmx\" file"); |
d5cb35d6 | 1663 | return -1; |
70761e5e | 1664 | } |
b29e05d6 | 1665 | } else { |
0fd73091 | 1666 | DEBUG("Removed existing \"/dev/ptmx\" file"); |
3c26f34e | 1667 | } |
1668 | ||
d5cb35d6 | 1669 | /* Create dummy /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
3b7e332f CB |
1670 | ret = mknod("/dev/ptmx", S_IFREG | 0000, 0); |
1671 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1672 | SYSERROR("Failed to create dummy \"/dev/ptmx\" file as bind mount target"); |
d5cb35d6 CB |
1673 | return -1; |
1674 | } | |
0fd73091 | 1675 | DEBUG("Created dummy \"/dev/ptmx\" file as bind mount target"); |
77890c6d | 1676 | |
d5cb35d6 | 1677 | /* Fallback option: create symlink /dev/ptmx -> /dev/pts/ptmx */ |
e87bd19c | 1678 | ret = mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL); |
d5cb35d6 | 1679 | if (!ret) { |
0fd73091 | 1680 | DEBUG("Bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1681 | return 0; |
1682 | } else { | |
1683 | /* Fallthrough and try to create a symlink. */ | |
0fd73091 | 1684 | ERROR("Failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1685 | } |
1686 | ||
1687 | /* Remove the dummy /dev/ptmx file we created above. */ | |
1688 | ret = remove("/dev/ptmx"); | |
70761e5e | 1689 | if (ret < 0) { |
0fd73091 | 1690 | SYSERROR("Failed to remove existing \"/dev/ptmx\""); |
d5cb35d6 CB |
1691 | return -1; |
1692 | } | |
1693 | ||
1694 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
1695 | ret = symlink("/dev/pts/ptmx", "/dev/ptmx"); | |
1696 | if (ret < 0) { | |
0fd73091 | 1697 | SYSERROR("Failed to create symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
3c26f34e | 1698 | return -1; |
1699 | } | |
0fd73091 | 1700 | DEBUG("Created symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
cd54d859 | 1701 | |
3c26f34e | 1702 | return 0; |
1703 | } | |
1704 | ||
cccc74b5 DL |
1705 | static int setup_personality(int persona) |
1706 | { | |
0fd73091 CB |
1707 | int ret; |
1708 | ||
1709 | #if HAVE_SYS_PERSONALITY_H | |
cccc74b5 DL |
1710 | if (persona == -1) |
1711 | return 0; | |
1712 | ||
0fd73091 CB |
1713 | ret = personality(persona); |
1714 | if (ret < 0) { | |
1715 | SYSERROR("Failed to set personality to \"0x%x\"", persona); | |
cccc74b5 DL |
1716 | return -1; |
1717 | } | |
1718 | ||
0fd73091 CB |
1719 | INFO("Set personality to \"0x%x\"", persona); |
1720 | #endif | |
cccc74b5 DL |
1721 | |
1722 | return 0; | |
1723 | } | |
1724 | ||
3d7d929a | 1725 | static int lxc_setup_dev_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1726 | const struct lxc_terminal *console) |
6e590161 | 1727 | { |
882671aa | 1728 | int ret; |
6b5a54cd | 1729 | char path[PATH_MAX]; |
86530b0a | 1730 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
52e35957 | 1731 | |
8b1b1210 CB |
1732 | if (console->path && !strcmp(console->path, "none")) |
1733 | return 0; | |
1734 | ||
86530b0a | 1735 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3d7d929a | 1736 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1737 | return -1; |
52e35957 | 1738 | |
8b1b1210 CB |
1739 | /* When we are asked to setup a console we remove any previous |
1740 | * /dev/console bind-mounts. | |
1741 | */ | |
a7ba3c7f CB |
1742 | if (file_exists(path)) { |
1743 | ret = lxc_unstack_mountpoint(path, false); | |
1744 | if (ret < 0) { | |
6d1400b5 | 1745 | SYSERROR("Failed to unmount \"%s\"", path); |
a7ba3c7f CB |
1746 | return -ret; |
1747 | } else { | |
86530b0a | 1748 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1749 | } |
8b1b1210 CB |
1750 | } |
1751 | ||
1752 | /* For unprivileged containers autodev or automounts will already have | |
1753 | * taken care of creating /dev/console. | |
1754 | */ | |
882671aa | 1755 | ret = mknod(path, S_IFREG | 0000, 0); |
3b7e332f CB |
1756 | if (ret < 0 && errno != EEXIST) { |
1757 | SYSERROR("Failed to create console"); | |
1758 | return -errno; | |
52e35957 DL |
1759 | } |
1760 | ||
e581b9b5 | 1761 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP); |
86530b0a | 1762 | if (ret < 0) { |
0fd73091 | 1763 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
e581b9b5 | 1764 | S_IXUSR | S_IXGRP, console->name); |
3d7d929a | 1765 | return -errno; |
63376d7d | 1766 | } |
13954cce | 1767 | |
86530b0a L |
1768 | ret = safe_mount(console->name, path, "none", MS_BIND, 0, rootfs_path); |
1769 | if (ret < 0) { | |
0fd73091 | 1770 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, path); |
6e590161 | 1771 | return -1; |
1772 | } | |
1773 | ||
86530b0a | 1774 | DEBUG("Mounted pts device \"%s\" onto \"%s\"", console->name, path); |
7c6ef2a2 SH |
1775 | return 0; |
1776 | } | |
1777 | ||
3d7d929a | 1778 | static int lxc_setup_ttydir_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1779 | const struct lxc_terminal *console, |
3d7d929a | 1780 | char *ttydir) |
7c6ef2a2 | 1781 | { |
3b7e332f | 1782 | int ret; |
6b5a54cd | 1783 | char path[PATH_MAX], lxcpath[PATH_MAX]; |
86530b0a | 1784 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
7c6ef2a2 | 1785 | |
3dc035f1 L |
1786 | if (console->path && !strcmp(console->path, "none")) |
1787 | return 0; | |
1788 | ||
7c6ef2a2 | 1789 | /* create rootfs/dev/<ttydir> directory */ |
86530b0a | 1790 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs_path, ttydir); |
3d7d929a | 1791 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1792 | return -1; |
3d7d929a | 1793 | |
7c6ef2a2 SH |
1794 | ret = mkdir(path, 0755); |
1795 | if (ret && errno != EEXIST) { | |
0fd73091 | 1796 | SYSERROR("Failed to create \"%s\"", path); |
3d7d929a | 1797 | return -errno; |
7c6ef2a2 | 1798 | } |
4742cd9a | 1799 | DEBUG("Created directory for console and tty devices at \"%s\"", path); |
7c6ef2a2 | 1800 | |
86530b0a | 1801 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", rootfs_path, ttydir); |
3d7d929a CB |
1802 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
1803 | return -1; | |
1804 | ||
3b7e332f CB |
1805 | ret = mknod(lxcpath, S_IFREG | 0000, 0); |
1806 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1807 | SYSERROR("Failed to create \"%s\"", lxcpath); |
3d7d929a | 1808 | return -errno; |
7c6ef2a2 | 1809 | } |
7c6ef2a2 | 1810 | |
86530b0a | 1811 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3dc035f1 | 1812 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1813 | return -1; |
2a12fefd | 1814 | |
3dc035f1 | 1815 | if (file_exists(path)) { |
a7ba3c7f | 1816 | ret = lxc_unstack_mountpoint(path, false); |
2a12fefd | 1817 | if (ret < 0) { |
6d1400b5 | 1818 | SYSERROR("Failed to unmount \"%s\"", path); |
a7ba3c7f CB |
1819 | return -ret; |
1820 | } else { | |
86530b0a | 1821 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1822 | } |
3dc035f1 | 1823 | } |
2a12fefd | 1824 | |
3b7e332f CB |
1825 | ret = mknod(path, S_IFREG | 0000, 0); |
1826 | if (ret < 0 && errno != EEXIST) { | |
1827 | SYSERROR("Failed to create console"); | |
1828 | return -errno; | |
7c6ef2a2 SH |
1829 | } |
1830 | ||
e581b9b5 | 1831 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP); |
86530b0a | 1832 | if (ret < 0) { |
0fd73091 | 1833 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
e581b9b5 | 1834 | S_IXUSR | S_IXGRP, console->name); |
2a12fefd CB |
1835 | return -errno; |
1836 | } | |
1837 | ||
3dc035f1 | 1838 | /* bind mount console->name to '/dev/<ttydir>/console' */ |
86530b0a L |
1839 | ret = safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs_path); |
1840 | if (ret < 0) { | |
0fd73091 | 1841 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
7c6ef2a2 SH |
1842 | return -1; |
1843 | } | |
86530b0a | 1844 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1845 | |
1846 | /* bind mount '/dev/<ttydir>/console' to '/dev/console' */ | |
86530b0a L |
1847 | ret = safe_mount(lxcpath, path, "none", MS_BIND, 0, rootfs_path); |
1848 | if (ret < 0) { | |
0fd73091 | 1849 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1850 | return -1; |
1851 | } | |
86530b0a | 1852 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 | 1853 | |
86530b0a | 1854 | DEBUG("Console has been setup under \"%s\" and mounted to \"%s\"", lxcpath, path); |
6e590161 | 1855 | return 0; |
1856 | } | |
1857 | ||
3d7d929a | 1858 | static int lxc_setup_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1859 | const struct lxc_terminal *console, char *ttydir) |
7c6ef2a2 | 1860 | { |
3d7d929a | 1861 | |
7c6ef2a2 | 1862 | if (!ttydir) |
3d7d929a | 1863 | return lxc_setup_dev_console(rootfs, console); |
7c6ef2a2 | 1864 | |
3d7d929a | 1865 | return lxc_setup_ttydir_console(rootfs, console, ttydir); |
7c6ef2a2 SH |
1866 | } |
1867 | ||
efed99a4 | 1868 | static void parse_mntopt(char *opt, unsigned long *flags, char **data, size_t size) |
998ac676 RT |
1869 | { |
1870 | struct mount_opt *mo; | |
1871 | ||
1872 | /* If opt is found in mount_opt, set or clear flags. | |
1873 | * Otherwise append it to data. */ | |
1874 | ||
1875 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
0fd73091 | 1876 | if (strncmp(opt, mo->name, strlen(mo->name)) == 0) { |
998ac676 RT |
1877 | if (mo->clear) |
1878 | *flags &= ~mo->flag; | |
1879 | else | |
1880 | *flags |= mo->flag; | |
1881 | return; | |
1882 | } | |
1883 | } | |
1884 | ||
f1e05b90 DJ |
1885 | if (strlen(*data)) |
1886 | (void)strlcat(*data, ",", size); | |
efed99a4 | 1887 | |
f1e05b90 | 1888 | (void)strlcat(*data, opt, size); |
998ac676 RT |
1889 | } |
1890 | ||
0fd73091 | 1891 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, char **mntdata) |
998ac676 | 1892 | { |
a71f619c CB |
1893 | __do_free char *data = NULL, *s = NULL; |
1894 | char *p; | |
efed99a4 | 1895 | size_t size; |
998ac676 | 1896 | |
911324ef | 1897 | *mntdata = NULL; |
91656ce5 | 1898 | *mntflags = 0L; |
911324ef DL |
1899 | |
1900 | if (!mntopts) | |
998ac676 RT |
1901 | return 0; |
1902 | ||
911324ef | 1903 | s = strdup(mntopts); |
0fd73091 | 1904 | if (!s) |
998ac676 | 1905 | return -1; |
998ac676 | 1906 | |
efed99a4 DJ |
1907 | size = strlen(s) + 1; |
1908 | data = malloc(size); | |
a71f619c | 1909 | if (!data) |
998ac676 | 1910 | return -1; |
998ac676 RT |
1911 | *data = 0; |
1912 | ||
8db9d26f | 1913 | lxc_iterate_parts(p, s, ",") |
efed99a4 | 1914 | parse_mntopt(p, mntflags, &data, size); |
998ac676 RT |
1915 | |
1916 | if (*data) | |
a71f619c | 1917 | *mntdata = move_ptr(data); |
998ac676 RT |
1918 | |
1919 | return 0; | |
1920 | } | |
1921 | ||
d840039e YT |
1922 | static void parse_propagationopt(char *opt, unsigned long *flags) |
1923 | { | |
1924 | struct mount_opt *mo; | |
1925 | ||
1926 | /* If opt is found in propagation_opt, set or clear flags. */ | |
d840039e | 1927 | for (mo = &propagation_opt[0]; mo->name != NULL; mo++) { |
0fd73091 CB |
1928 | if (strncmp(opt, mo->name, strlen(mo->name)) != 0) |
1929 | continue; | |
1930 | ||
1931 | if (mo->clear) | |
1932 | *flags &= ~mo->flag; | |
1933 | else | |
1934 | *flags |= mo->flag; | |
1935 | ||
1936 | return; | |
d840039e YT |
1937 | } |
1938 | } | |
1939 | ||
8ce1abc2 | 1940 | int parse_propagationopts(const char *mntopts, unsigned long *pflags) |
d840039e | 1941 | { |
dfd2e059 CB |
1942 | __do_free char *s = NULL; |
1943 | char *p; | |
d840039e YT |
1944 | |
1945 | if (!mntopts) | |
1946 | return 0; | |
1947 | ||
1948 | s = strdup(mntopts); | |
1949 | if (!s) { | |
1950 | SYSERROR("Failed to allocate memory"); | |
1951 | return -ENOMEM; | |
1952 | } | |
1953 | ||
0fd73091 | 1954 | *pflags = 0L; |
8db9d26f | 1955 | lxc_iterate_parts(p, s, ",") |
d840039e | 1956 | parse_propagationopt(p, pflags); |
0fd73091 | 1957 | |
d840039e YT |
1958 | return 0; |
1959 | } | |
1960 | ||
6fd5e769 SH |
1961 | static void null_endofword(char *word) |
1962 | { | |
1963 | while (*word && *word != ' ' && *word != '\t') | |
1964 | word++; | |
1965 | *word = '\0'; | |
1966 | } | |
1967 | ||
0fd73091 | 1968 | /* skip @nfields spaces in @src */ |
6fd5e769 SH |
1969 | static char *get_field(char *src, int nfields) |
1970 | { | |
6fd5e769 | 1971 | int i; |
0fd73091 | 1972 | char *p = src; |
6fd5e769 SH |
1973 | |
1974 | for (i = 0; i < nfields; i++) { | |
1975 | while (*p && *p != ' ' && *p != '\t') | |
1976 | p++; | |
0fd73091 | 1977 | |
6fd5e769 SH |
1978 | if (!*p) |
1979 | break; | |
0fd73091 | 1980 | |
6fd5e769 SH |
1981 | p++; |
1982 | } | |
0fd73091 | 1983 | |
6fd5e769 SH |
1984 | return p; |
1985 | } | |
1986 | ||
911324ef DL |
1987 | static int mount_entry(const char *fsname, const char *target, |
1988 | const char *fstype, unsigned long mountflags, | |
d840039e YT |
1989 | unsigned long pflags, const char *data, bool optional, |
1990 | bool dev, bool relative, const char *rootfs) | |
911324ef | 1991 | { |
0ac4b28a | 1992 | int ret; |
6b5a54cd | 1993 | char srcbuf[PATH_MAX]; |
181437fd | 1994 | const char *srcpath = fsname; |
614305f3 | 1995 | #ifdef HAVE_STATVFS |
2938f7c8 | 1996 | struct statvfs sb; |
614305f3 | 1997 | #endif |
2938f7c8 | 1998 | |
181437fd | 1999 | if (relative) { |
6b5a54cd CB |
2000 | ret = snprintf(srcbuf, PATH_MAX, "%s/%s", rootfs ? rootfs : "/", fsname ? fsname : ""); |
2001 | if (ret < 0 || ret >= PATH_MAX) { | |
181437fd YT |
2002 | ERROR("source path is too long"); |
2003 | return -1; | |
2004 | } | |
2005 | srcpath = srcbuf; | |
2006 | } | |
2007 | ||
2008 | ret = safe_mount(srcpath, target, fstype, mountflags & ~MS_REMOUNT, data, | |
0ac4b28a CB |
2009 | rootfs); |
2010 | if (ret < 0) { | |
1fc64d22 | 2011 | if (optional) { |
7874d81a | 2012 | SYSINFO("Failed to mount \"%s\" on \"%s\" (optional)", |
2013 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
2014 | return 0; |
2015 | } | |
0ac4b28a | 2016 | |
0103eb53 | 2017 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2018 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2019 | return -1; |
911324ef DL |
2020 | } |
2021 | ||
2022 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
7c5b6e7c | 2023 | unsigned long rqd_flags = 0; |
0ac4b28a CB |
2024 | |
2025 | DEBUG("Remounting \"%s\" on \"%s\" to respect bind or remount " | |
181437fd | 2026 | "options", srcpath ? srcpath : "(none)", target ? target : "(none)"); |
0ac4b28a | 2027 | |
7c5b6e7c AS |
2028 | if (mountflags & MS_RDONLY) |
2029 | rqd_flags |= MS_RDONLY; | |
614305f3 | 2030 | #ifdef HAVE_STATVFS |
181437fd | 2031 | if (srcpath && statvfs(srcpath, &sb) == 0) { |
7c5b6e7c | 2032 | unsigned long required_flags = rqd_flags; |
0ac4b28a | 2033 | |
2938f7c8 SH |
2034 | if (sb.f_flag & MS_NOSUID) |
2035 | required_flags |= MS_NOSUID; | |
0ac4b28a | 2036 | |
ae7a770e | 2037 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 | 2038 | required_flags |= MS_NODEV; |
0ac4b28a | 2039 | |
2938f7c8 SH |
2040 | if (sb.f_flag & MS_RDONLY) |
2041 | required_flags |= MS_RDONLY; | |
0ac4b28a | 2042 | |
2938f7c8 SH |
2043 | if (sb.f_flag & MS_NOEXEC) |
2044 | required_flags |= MS_NOEXEC; | |
0ac4b28a CB |
2045 | |
2046 | DEBUG("Flags for \"%s\" were %lu, required extra flags " | |
181437fd | 2047 | "are %lu", srcpath, sb.f_flag, required_flags); |
0ac4b28a CB |
2048 | |
2049 | /* If this was a bind mount request, and required_flags | |
2938f7c8 | 2050 | * does not have any flags which are not already in |
0ac4b28a | 2051 | * mountflags, then skip the remount. |
2938f7c8 SH |
2052 | */ |
2053 | if (!(mountflags & MS_REMOUNT)) { | |
0ac4b28a CB |
2054 | if (!(required_flags & ~mountflags) && |
2055 | rqd_flags == 0) { | |
2056 | DEBUG("Mountflags already were %lu, " | |
2057 | "skipping remount", mountflags); | |
2938f7c8 SH |
2058 | goto skipremount; |
2059 | } | |
2060 | } | |
0ac4b28a | 2061 | |
2938f7c8 | 2062 | mountflags |= required_flags; |
6fd5e769 | 2063 | } |
614305f3 | 2064 | #endif |
911324ef | 2065 | |
181437fd | 2066 | ret = mount(srcpath, target, fstype, mountflags | MS_REMOUNT, data); |
0ac4b28a | 2067 | if (ret < 0) { |
1fc64d22 | 2068 | if (optional) { |
7874d81a | 2069 | SYSINFO("Failed to mount \"%s\" on \"%s\" (optional)", |
2070 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
2071 | return 0; |
2072 | } | |
0ac4b28a | 2073 | |
0103eb53 | 2074 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2075 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2076 | return -1; |
911324ef DL |
2077 | } |
2078 | } | |
2079 | ||
a3ed9b81 | 2080 | #ifdef HAVE_STATVFS |
2081 | skipremount: | |
2082 | #endif | |
d840039e YT |
2083 | if (pflags) { |
2084 | ret = mount(NULL, target, NULL, pflags, NULL); | |
2085 | if (ret < 0) { | |
2086 | if (optional) { | |
7874d81a | 2087 | SYSINFO("Failed to change mount propagation " |
2088 | "for \"%s\" (optional)", target); | |
d840039e YT |
2089 | return 0; |
2090 | } else { | |
2091 | SYSERROR("Failed to change mount propagation " | |
2092 | "for \"%s\" (optional)", target); | |
2093 | return -1; | |
2094 | } | |
2095 | } | |
2096 | DEBUG("Changed mount propagation for \"%s\"", target); | |
2097 | } | |
2098 | ||
0103eb53 | 2099 | DEBUG("Mounted \"%s\" on \"%s\" with filesystem type \"%s\"", |
181437fd | 2100 | srcpath ? srcpath : "(null)", target, fstype); |
911324ef DL |
2101 | |
2102 | return 0; | |
2103 | } | |
2104 | ||
c5e30de4 | 2105 | /* Remove "optional", "create=dir", and "create=file" from mntopt */ |
4e4ca161 SH |
2106 | static void cull_mntent_opt(struct mntent *mntent) |
2107 | { | |
2108 | int i; | |
0fd73091 CB |
2109 | char *list[] = { |
2110 | "create=dir", | |
2111 | "create=file", | |
2112 | "optional", | |
2113 | "relative", | |
2114 | NULL | |
2115 | }; | |
c5e30de4 CB |
2116 | |
2117 | for (i = 0; list[i]; i++) { | |
2118 | char *p, *p2; | |
2119 | ||
2120 | p = strstr(mntent->mnt_opts, list[i]); | |
2121 | if (!p) | |
4e4ca161 | 2122 | continue; |
c5e30de4 | 2123 | |
4e4ca161 SH |
2124 | p2 = strchr(p, ','); |
2125 | if (!p2) { | |
2126 | /* no more mntopts, so just chop it here */ | |
2127 | *p = '\0'; | |
2128 | continue; | |
2129 | } | |
c5e30de4 CB |
2130 | |
2131 | memmove(p, p2 + 1, strlen(p2 + 1) + 1); | |
4e4ca161 SH |
2132 | } |
2133 | } | |
2134 | ||
4d5b72a1 | 2135 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
749f98d9 CB |
2136 | const char *path, |
2137 | const struct lxc_rootfs *rootfs, | |
0fd73091 | 2138 | const char *lxc_name, const char *lxc_path) |
0ad19a3f | 2139 | { |
7a76eeaa | 2140 | __do_free char *p1 = NULL; |
3b7e332f | 2141 | int ret; |
7a76eeaa | 2142 | char *p2; |
911324ef | 2143 | |
12e6ab5d | 2144 | if (strncmp(mntent->mnt_type, "overlay", 7) == 0) { |
749f98d9 | 2145 | ret = ovl_mkdir(mntent, rootfs, lxc_name, lxc_path); |
12e6ab5d CB |
2146 | if (ret < 0) |
2147 | return -1; | |
2148 | } | |
6e46cc0d | 2149 | |
34cfffb3 | 2150 | if (hasmntopt(mntent, "create=dir")) { |
749f98d9 CB |
2151 | ret = mkdir_p(path, 0755); |
2152 | if (ret < 0 && errno != EEXIST) { | |
2153 | SYSERROR("Failed to create directory \"%s\"", path); | |
2154 | return -1; | |
34cfffb3 SG |
2155 | } |
2156 | } | |
2157 | ||
0fd73091 CB |
2158 | if (!hasmntopt(mntent, "create=file")) |
2159 | return 0; | |
749f98d9 | 2160 | |
0fd73091 CB |
2161 | ret = access(path, F_OK); |
2162 | if (ret == 0) | |
2163 | return 0; | |
749f98d9 | 2164 | |
0fd73091 CB |
2165 | p1 = strdup(path); |
2166 | if (!p1) | |
2167 | return -1; | |
749f98d9 | 2168 | |
0fd73091 | 2169 | p2 = dirname(p1); |
749f98d9 | 2170 | |
0fd73091 | 2171 | ret = mkdir_p(p2, 0755); |
0fd73091 CB |
2172 | if (ret < 0 && errno != EEXIST) { |
2173 | SYSERROR("Failed to create directory \"%s\"", path); | |
2174 | return -1; | |
34cfffb3 | 2175 | } |
749f98d9 | 2176 | |
3b7e332f CB |
2177 | ret = mknod(path, S_IFREG | 0000, 0); |
2178 | if (ret < 0 && errno != EEXIST) | |
2179 | return -errno; | |
0fd73091 | 2180 | |
749f98d9 | 2181 | return 0; |
4d5b72a1 NC |
2182 | } |
2183 | ||
ec50007f CB |
2184 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
2185 | * without a rootfs. */ | |
db4aba38 | 2186 | static inline int mount_entry_on_generic(struct mntent *mntent, |
d8b712bc CB |
2187 | const char *path, |
2188 | const struct lxc_rootfs *rootfs, | |
2189 | const char *lxc_name, | |
2190 | const char *lxc_path) | |
4d5b72a1 | 2191 | { |
fd214f37 | 2192 | __do_free char *mntdata = NULL; |
d8b712bc | 2193 | int ret; |
949d0338 | 2194 | unsigned long mntflags; |
181437fd | 2195 | bool dev, optional, relative; |
949d0338 | 2196 | unsigned long pflags = 0; |
ec50007f | 2197 | char *rootfs_path = NULL; |
d8b712bc CB |
2198 | |
2199 | optional = hasmntopt(mntent, "optional") != NULL; | |
2200 | dev = hasmntopt(mntent, "dev") != NULL; | |
181437fd | 2201 | relative = hasmntopt(mntent, "relative") != NULL; |
d8b712bc | 2202 | |
ec50007f CB |
2203 | if (rootfs && rootfs->path) |
2204 | rootfs_path = rootfs->mount; | |
2205 | ||
d8b712bc CB |
2206 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, |
2207 | lxc_path); | |
2208 | if (ret < 0) { | |
2209 | if (optional) | |
2210 | return 0; | |
608e3567 | 2211 | |
d8b712bc CB |
2212 | return -1; |
2213 | } | |
4e4ca161 SH |
2214 | cull_mntent_opt(mntent); |
2215 | ||
d840039e YT |
2216 | ret = parse_propagationopts(mntent->mnt_opts, &pflags); |
2217 | if (ret < 0) | |
2218 | return -1; | |
2219 | ||
d8b712bc CB |
2220 | ret = parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata); |
2221 | if (ret < 0) | |
a17b1e65 | 2222 | return -1; |
a17b1e65 | 2223 | |
6e46cc0d | 2224 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
d840039e | 2225 | pflags, mntdata, optional, dev, relative, rootfs_path); |
68c152ef | 2226 | |
911324ef DL |
2227 | return ret; |
2228 | } | |
2229 | ||
db4aba38 NC |
2230 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
2231 | { | |
1433c9f9 | 2232 | int ret; |
6b5a54cd | 2233 | char path[PATH_MAX]; |
1433c9f9 CB |
2234 | |
2235 | /* For containers created without a rootfs all mounts are treated as | |
07667a6a CB |
2236 | * absolute paths starting at / on the host. |
2237 | */ | |
1433c9f9 CB |
2238 | if (mntent->mnt_dir[0] != '/') |
2239 | ret = snprintf(path, sizeof(path), "/%s", mntent->mnt_dir); | |
2240 | else | |
2241 | ret = snprintf(path, sizeof(path), "%s", mntent->mnt_dir); | |
07667a6a | 2242 | if (ret < 0 || ret >= sizeof(path)) |
1433c9f9 | 2243 | return -1; |
1433c9f9 CB |
2244 | |
2245 | return mount_entry_on_generic(mntent, path, NULL, NULL, NULL); | |
db4aba38 NC |
2246 | } |
2247 | ||
4e4ca161 | 2248 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 | 2249 | const struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2250 | const char *lxc_name, |
2251 | const char *lxc_path) | |
911324ef | 2252 | { |
bdd2b34c | 2253 | int offset; |
013bd428 | 2254 | char *aux; |
67e571de | 2255 | const char *lxcpath; |
6b5a54cd | 2256 | char path[PATH_MAX]; |
bdd2b34c | 2257 | int ret = 0; |
0ad19a3f | 2258 | |
593e8478 | 2259 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
bdd2b34c | 2260 | if (!lxcpath) |
2a59a681 | 2261 | return -1; |
2a59a681 | 2262 | |
bdd2b34c CB |
2263 | /* If rootfs->path is a blockdev path, allow container fstab to use |
2264 | * <lxcpath>/<name>/rootfs" as the target prefix. | |
2265 | */ | |
6b5a54cd CB |
2266 | ret = snprintf(path, PATH_MAX, "%s/%s/rootfs", lxcpath, lxc_name); |
2267 | if (ret < 0 || ret >= PATH_MAX) | |
80a881b2 SH |
2268 | goto skipvarlib; |
2269 | ||
2270 | aux = strstr(mntent->mnt_dir, path); | |
2271 | if (aux) { | |
2272 | offset = strlen(path); | |
2273 | goto skipabs; | |
2274 | } | |
2275 | ||
2276 | skipvarlib: | |
013bd428 DL |
2277 | aux = strstr(mntent->mnt_dir, rootfs->path); |
2278 | if (!aux) { | |
bdd2b34c | 2279 | WARN("Ignoring mount point \"%s\"", mntent->mnt_dir); |
db4aba38 | 2280 | return ret; |
013bd428 | 2281 | } |
80a881b2 SH |
2282 | offset = strlen(rootfs->path); |
2283 | ||
2284 | skipabs: | |
6b5a54cd CB |
2285 | ret = snprintf(path, PATH_MAX, "%s/%s", rootfs->mount, aux + offset); |
2286 | if (ret < 0 || ret >= PATH_MAX) | |
a17b1e65 | 2287 | return -1; |
a17b1e65 | 2288 | |
0a2dddd4 | 2289 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef | 2290 | } |
d330fe7b | 2291 | |
4e4ca161 | 2292 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
0a2dddd4 CB |
2293 | const struct lxc_rootfs *rootfs, |
2294 | const char *lxc_name, | |
2295 | const char *lxc_path) | |
911324ef | 2296 | { |
911324ef | 2297 | int ret; |
6b5a54cd | 2298 | char path[PATH_MAX]; |
d330fe7b | 2299 | |
34cfffb3 | 2300 | /* relative to root mount point */ |
6e46cc0d | 2301 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs->mount, mntent->mnt_dir); |
0fd73091 | 2302 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
9ba8130c | 2303 | return -1; |
911324ef | 2304 | |
0a2dddd4 | 2305 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef DL |
2306 | } |
2307 | ||
06749971 CB |
2308 | static int mount_file_entries(const struct lxc_conf *conf, |
2309 | const struct lxc_rootfs *rootfs, FILE *file, | |
1ae3c19f | 2310 | const char *lxc_name, const char *lxc_path) |
911324ef | 2311 | { |
9d03d857 | 2312 | char buf[PATH_MAX]; |
0fd73091 | 2313 | struct mntent mntent; |
e76b8764 | 2314 | |
aaf901be | 2315 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
9d03d857 CB |
2316 | int ret; |
2317 | ||
1ae3c19f CB |
2318 | if (!rootfs->path) |
2319 | ret = mount_entry_on_systemfs(&mntent); | |
2320 | else if (mntent.mnt_dir[0] != '/') | |
2321 | ret = mount_entry_on_relative_rootfs(&mntent, rootfs, | |
2322 | lxc_name, lxc_path); | |
2323 | else | |
2324 | ret = mount_entry_on_absolute_rootfs(&mntent, rootfs, | |
9d03d857 | 2325 | lxc_name, lxc_path); |
1ae3c19f CB |
2326 | if (ret < 0) |
2327 | return -1; | |
0ad19a3f | 2328 | } |
cd54d859 | 2329 | |
9d03d857 CB |
2330 | if (!feof(file) || ferror(file)) { |
2331 | ERROR("Failed to parse mount entries"); | |
2332 | return -1; | |
2333 | } | |
2334 | ||
2335 | return 0; | |
e7938e9e MN |
2336 | } |
2337 | ||
06749971 CB |
2338 | static int setup_mount(const struct lxc_conf *conf, |
2339 | const struct lxc_rootfs *rootfs, const char *fstab, | |
42dff448 | 2340 | const char *lxc_name, const char *lxc_path) |
e7938e9e | 2341 | { |
42dff448 | 2342 | FILE *f; |
e7938e9e MN |
2343 | int ret; |
2344 | ||
2345 | if (!fstab) | |
2346 | return 0; | |
2347 | ||
42dff448 CB |
2348 | f = setmntent(fstab, "r"); |
2349 | if (!f) { | |
2350 | SYSERROR("Failed to open \"%s\"", fstab); | |
e7938e9e MN |
2351 | return -1; |
2352 | } | |
2353 | ||
06749971 | 2354 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
42dff448 CB |
2355 | if (ret < 0) |
2356 | ERROR("Failed to set up mount entries"); | |
e7938e9e | 2357 | |
42dff448 | 2358 | endmntent(f); |
0ad19a3f | 2359 | return ret; |
2360 | } | |
2361 | ||
1800f924 WB |
2362 | /* |
2363 | * In order for nested containers to be able to mount /proc and /sys they need | |
2364 | * to see a "pure" proc and sysfs mount points with nothing mounted on top | |
2365 | * (like lxcfs). | |
2366 | * For this we provide proc and sysfs in /dev/.lxc/{proc,sys} while using an | |
2367 | * apparmor rule to deny access to them. This is mostly for convenience: The | |
2368 | * container's root user can mount them anyway and thus has access to the two | |
2369 | * file systems. But a non-root user in the container should not be allowed to | |
2370 | * access them as a side effect without explicitly allowing it. | |
2371 | */ | |
2372 | static const char nesting_helpers[] = | |
dc691e34 CB |
2373 | "proc dev/.lxc/proc proc create=dir,optional 0 0\n" |
2374 | "sys dev/.lxc/sys sysfs create=dir,optional 0 0\n"; | |
1800f924 WB |
2375 | |
2376 | FILE *make_anonymous_mount_file(struct lxc_list *mount, | |
2377 | bool include_nesting_helpers) | |
e7938e9e | 2378 | { |
79bcf5ee | 2379 | __do_close_prot_errno int fd = -EBADF; |
5ef5c9a3 | 2380 | int ret; |
e7938e9e | 2381 | char *mount_entry; |
5ef5c9a3 | 2382 | struct lxc_list *iterator; |
5ef5c9a3 | 2383 | |
0fd73091 | 2384 | fd = memfd_create(".lxc_mount_file", MFD_CLOEXEC); |
5ef5c9a3 | 2385 | if (fd < 0) { |
a324e7eb CB |
2386 | char template[] = P_tmpdir "/.lxc_mount_file_XXXXXX"; |
2387 | ||
5ef5c9a3 CB |
2388 | if (errno != ENOSYS) |
2389 | return NULL; | |
a324e7eb CB |
2390 | |
2391 | fd = lxc_make_tmpfile(template, true); | |
0fd73091 CB |
2392 | if (fd < 0) { |
2393 | SYSERROR("Could not create temporary mount file"); | |
2394 | return NULL; | |
2395 | } | |
2396 | ||
6bd04140 | 2397 | TRACE("Created temporary mount file"); |
5ef5c9a3 | 2398 | } |
e7938e9e | 2399 | |
0fd73091 CB |
2400 | lxc_list_for_each (iterator, mount) { |
2401 | size_t len; | |
2402 | ||
e7938e9e | 2403 | mount_entry = iterator->elem; |
0fd73091 | 2404 | len = strlen(mount_entry); |
5ef5c9a3 | 2405 | |
489f39be | 2406 | ret = lxc_write_nointr(fd, mount_entry, len); |
0fd73091 | 2407 | if (ret != len) |
79bcf5ee | 2408 | return NULL; |
0fd73091 | 2409 | |
489f39be | 2410 | ret = lxc_write_nointr(fd, "\n", 1); |
0fd73091 | 2411 | if (ret != 1) |
79bcf5ee | 2412 | return NULL; |
e7938e9e MN |
2413 | } |
2414 | ||
1800f924 WB |
2415 | if (include_nesting_helpers) { |
2416 | ret = lxc_write_nointr(fd, nesting_helpers, | |
6333c915 CB |
2417 | STRARRAYLEN(nesting_helpers)); |
2418 | if (ret != STRARRAYLEN(nesting_helpers)) | |
79bcf5ee | 2419 | return NULL; |
1800f924 WB |
2420 | } |
2421 | ||
0fd73091 CB |
2422 | ret = lseek(fd, 0, SEEK_SET); |
2423 | if (ret < 0) | |
79bcf5ee | 2424 | return NULL; |
0fd73091 | 2425 | |
79bcf5ee | 2426 | return fdopen(move_fd(fd), "r+"); |
9fc7f8c0 TA |
2427 | } |
2428 | ||
06749971 CB |
2429 | static int setup_mount_entries(const struct lxc_conf *conf, |
2430 | const struct lxc_rootfs *rootfs, | |
5ef5c9a3 CB |
2431 | struct lxc_list *mount, const char *lxc_name, |
2432 | const char *lxc_path) | |
9fc7f8c0 | 2433 | { |
c85ced65 | 2434 | __do_fclose FILE *f = NULL; |
9fc7f8c0 | 2435 | |
1800f924 | 2436 | f = make_anonymous_mount_file(mount, conf->lsm_aa_allow_nesting); |
19b5d755 | 2437 | if (!f) |
9fc7f8c0 | 2438 | return -1; |
e7938e9e | 2439 | |
c85ced65 | 2440 | return mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
e7938e9e MN |
2441 | } |
2442 | ||
bab88e68 CS |
2443 | static int parse_cap(const char *cap) |
2444 | { | |
84760c11 | 2445 | size_t i; |
2446 | int capid = -1; | |
0fd73091 CB |
2447 | size_t end = sizeof(caps_opt) / sizeof(caps_opt[0]); |
2448 | char *ptr = NULL; | |
bab88e68 | 2449 | |
0fd73091 | 2450 | if (strcmp(cap, "none") == 0) |
7035407c DE |
2451 | return -2; |
2452 | ||
8560cd36 | 2453 | for (i = 0; i < end; i++) { |
bab88e68 CS |
2454 | if (strcmp(cap, caps_opt[i].name)) |
2455 | continue; | |
2456 | ||
2457 | capid = caps_opt[i].value; | |
2458 | break; | |
2459 | } | |
2460 | ||
2461 | if (capid < 0) { | |
0fd73091 CB |
2462 | /* Try to see if it's numeric, so the user may specify |
2463 | * capabilities that the running kernel knows about but we | |
2464 | * don't | |
2465 | */ | |
bab88e68 CS |
2466 | errno = 0; |
2467 | capid = strtol(cap, &ptr, 10); | |
2468 | if (!ptr || *ptr != '\0' || errno != 0) | |
2469 | /* not a valid number */ | |
2470 | capid = -1; | |
2471 | else if (capid > lxc_caps_last_cap()) | |
2472 | /* we have a number but it's not a valid | |
2473 | * capability */ | |
2474 | capid = -1; | |
2475 | } | |
2476 | ||
2477 | return capid; | |
2478 | } | |
2479 | ||
0769b82a CS |
2480 | int in_caplist(int cap, struct lxc_list *caps) |
2481 | { | |
0769b82a | 2482 | int capid; |
0fd73091 | 2483 | struct lxc_list *iterator; |
0769b82a | 2484 | |
0fd73091 | 2485 | lxc_list_for_each (iterator, caps) { |
0769b82a CS |
2486 | capid = parse_cap(iterator->elem); |
2487 | if (capid == cap) | |
2488 | return 1; | |
2489 | } | |
2490 | ||
2491 | return 0; | |
2492 | } | |
2493 | ||
81810dd1 DL |
2494 | static int setup_caps(struct lxc_list *caps) |
2495 | { | |
bab88e68 | 2496 | int capid; |
0fd73091 CB |
2497 | char *drop_entry; |
2498 | struct lxc_list *iterator; | |
81810dd1 | 2499 | |
0fd73091 CB |
2500 | lxc_list_for_each (iterator, caps) { |
2501 | int ret; | |
81810dd1 DL |
2502 | |
2503 | drop_entry = iterator->elem; | |
2504 | ||
bab88e68 | 2505 | capid = parse_cap(drop_entry); |
0fd73091 | 2506 | if (capid < 0) { |
1e11be34 DL |
2507 | ERROR("unknown capability %s", drop_entry); |
2508 | return -1; | |
81810dd1 DL |
2509 | } |
2510 | ||
b81689a1 CB |
2511 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(capid), prctl_arg(0), |
2512 | prctl_arg(0), prctl_arg(0)); | |
0fd73091 CB |
2513 | if (ret < 0) { |
2514 | SYSERROR("Failed to remove %s capability", drop_entry); | |
3ec1648d SH |
2515 | return -1; |
2516 | } | |
0fd73091 | 2517 | DEBUG("Dropped %s (%d) capability", drop_entry, capid); |
81810dd1 DL |
2518 | } |
2519 | ||
0fd73091 | 2520 | DEBUG("Capabilities have been setup"); |
1fb86a7c SH |
2521 | return 0; |
2522 | } | |
2523 | ||
2524 | static int dropcaps_except(struct lxc_list *caps) | |
2525 | { | |
2f443e88 | 2526 | __do_free int *caplist = NULL; |
0fd73091 | 2527 | int i, capid, numcaps; |
1fb86a7c | 2528 | char *keep_entry; |
0fd73091 | 2529 | struct lxc_list *iterator; |
1fb86a7c | 2530 | |
0fd73091 | 2531 | numcaps = lxc_caps_last_cap() + 1; |
2caf9a97 SH |
2532 | if (numcaps <= 0 || numcaps > 200) |
2533 | return -1; | |
0fd73091 | 2534 | TRACE("Found %d capabilities", numcaps); |
2caf9a97 | 2535 | |
1a0e70ac | 2536 | /* caplist[i] is 1 if we keep capability i */ |
2f443e88 | 2537 | caplist = must_realloc(NULL, numcaps * sizeof(int)); |
1fb86a7c SH |
2538 | memset(caplist, 0, numcaps * sizeof(int)); |
2539 | ||
0fd73091 | 2540 | lxc_list_for_each (iterator, caps) { |
1fb86a7c SH |
2541 | keep_entry = iterator->elem; |
2542 | ||
bab88e68 | 2543 | capid = parse_cap(keep_entry); |
7035407c DE |
2544 | if (capid == -2) |
2545 | continue; | |
2546 | ||
0fd73091 CB |
2547 | if (capid < 0) { |
2548 | ERROR("Unknown capability %s", keep_entry); | |
1fb86a7c SH |
2549 | return -1; |
2550 | } | |
2551 | ||
0fd73091 | 2552 | DEBUG("Keep capability %s (%d)", keep_entry, capid); |
1fb86a7c SH |
2553 | caplist[capid] = 1; |
2554 | } | |
0fd73091 CB |
2555 | |
2556 | for (i = 0; i < numcaps; i++) { | |
2557 | int ret; | |
2558 | ||
1fb86a7c SH |
2559 | if (caplist[i]) |
2560 | continue; | |
0fd73091 | 2561 | |
b81689a1 CB |
2562 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(i), prctl_arg(0), |
2563 | prctl_arg(0), prctl_arg(0)); | |
0fd73091 CB |
2564 | if (ret < 0) { |
2565 | SYSERROR("Failed to remove capability %d", i); | |
3ec1648d SH |
2566 | return -1; |
2567 | } | |
1fb86a7c SH |
2568 | } |
2569 | ||
0fd73091 | 2570 | DEBUG("Capabilities have been setup"); |
81810dd1 DL |
2571 | return 0; |
2572 | } | |
2573 | ||
0fd73091 CB |
2574 | static int parse_resource(const char *res) |
2575 | { | |
2576 | int ret; | |
c6d09e15 WB |
2577 | size_t i; |
2578 | int resid = -1; | |
2579 | ||
0fd73091 | 2580 | for (i = 0; i < sizeof(limit_opt) / sizeof(limit_opt[0]); ++i) |
c6d09e15 WB |
2581 | if (strcmp(res, limit_opt[i].name) == 0) |
2582 | return limit_opt[i].value; | |
c6d09e15 | 2583 | |
0fd73091 | 2584 | /* Try to see if it's numeric, so the user may specify |
c6d09e15 | 2585 | * resources that the running kernel knows about but |
0fd73091 CB |
2586 | * we don't. |
2587 | */ | |
2588 | ret = lxc_safe_int(res, &resid); | |
2589 | if (ret < 0) | |
2590 | return -1; | |
2591 | ||
2592 | return resid; | |
c6d09e15 WB |
2593 | } |
2594 | ||
0fd73091 CB |
2595 | int setup_resource_limits(struct lxc_list *limits, pid_t pid) |
2596 | { | |
2597 | int resid; | |
c6d09e15 WB |
2598 | struct lxc_list *it; |
2599 | struct lxc_limit *lim; | |
c6d09e15 | 2600 | |
0fd73091 | 2601 | lxc_list_for_each (it, limits) { |
c6d09e15 WB |
2602 | lim = it->elem; |
2603 | ||
2604 | resid = parse_resource(lim->resource); | |
2605 | if (resid < 0) { | |
0fd73091 | 2606 | ERROR("Unknown resource %s", lim->resource); |
c6d09e15 WB |
2607 | return -1; |
2608 | } | |
2609 | ||
f48b5fd8 | 2610 | #if HAVE_PRLIMIT || HAVE_PRLIMIT64 |
c6d09e15 | 2611 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) { |
6d1400b5 | 2612 | SYSERROR("Failed to set limit %s", lim->resource); |
c6d09e15 WB |
2613 | return -1; |
2614 | } | |
2de12765 CB |
2615 | |
2616 | TRACE("Setup \"%s\" limit", lim->resource); | |
f48b5fd8 | 2617 | #else |
2de12765 | 2618 | ERROR("Cannot set limit \"%s\" as prlimit is missing", lim->resource); |
f48b5fd8 FF |
2619 | return -1; |
2620 | #endif | |
c6d09e15 | 2621 | } |
0fd73091 | 2622 | |
c6d09e15 WB |
2623 | return 0; |
2624 | } | |
2625 | ||
7edd0540 L |
2626 | int setup_sysctl_parameters(struct lxc_list *sysctls) |
2627 | { | |
e6f76452 | 2628 | __do_free char *tmp = NULL; |
7edd0540 L |
2629 | struct lxc_list *it; |
2630 | struct lxc_sysctl *elem; | |
0fd73091 | 2631 | int ret = 0; |
6b5a54cd | 2632 | char filename[PATH_MAX] = {0}; |
7edd0540 | 2633 | |
0fd73091 | 2634 | lxc_list_for_each (it, sysctls) { |
7edd0540 L |
2635 | elem = it->elem; |
2636 | tmp = lxc_string_replace(".", "/", elem->key); | |
2637 | if (!tmp) { | |
2638 | ERROR("Failed to replace key %s", elem->key); | |
2639 | return -1; | |
2640 | } | |
2641 | ||
2642 | ret = snprintf(filename, sizeof(filename), "/proc/sys/%s", tmp); | |
7edd0540 L |
2643 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { |
2644 | ERROR("Error setting up sysctl parameters path"); | |
2645 | return -1; | |
2646 | } | |
2647 | ||
0fd73091 | 2648 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2649 | strlen(elem->value), false, 0666); |
7edd0540 | 2650 | if (ret < 0) { |
688e8982 WB |
2651 | SYSERROR("Failed to setup sysctl parameters %s to %s", |
2652 | elem->key, elem->value); | |
7edd0540 L |
2653 | return -1; |
2654 | } | |
2655 | } | |
0fd73091 | 2656 | |
7edd0540 L |
2657 | return 0; |
2658 | } | |
2659 | ||
61d7a733 YT |
2660 | int setup_proc_filesystem(struct lxc_list *procs, pid_t pid) |
2661 | { | |
0c669152 | 2662 | __do_free char *tmp = NULL; |
61d7a733 YT |
2663 | struct lxc_list *it; |
2664 | struct lxc_proc *elem; | |
0fd73091 | 2665 | int ret = 0; |
6b5a54cd | 2666 | char filename[PATH_MAX] = {0}; |
61d7a733 | 2667 | |
0fd73091 | 2668 | lxc_list_for_each (it, procs) { |
61d7a733 YT |
2669 | elem = it->elem; |
2670 | tmp = lxc_string_replace(".", "/", elem->filename); | |
2671 | if (!tmp) { | |
2672 | ERROR("Failed to replace key %s", elem->filename); | |
2673 | return -1; | |
2674 | } | |
2675 | ||
2676 | ret = snprintf(filename, sizeof(filename), "/proc/%d/%s", pid, tmp); | |
61d7a733 YT |
2677 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { |
2678 | ERROR("Error setting up proc filesystem path"); | |
2679 | return -1; | |
2680 | } | |
2681 | ||
0fd73091 | 2682 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2683 | strlen(elem->value), false, 0666); |
61d7a733 | 2684 | if (ret < 0) { |
688e8982 WB |
2685 | SYSERROR("Failed to setup proc filesystem %s to %s", |
2686 | elem->filename, elem->value); | |
61d7a733 YT |
2687 | return -1; |
2688 | } | |
2689 | } | |
0fd73091 | 2690 | |
61d7a733 YT |
2691 | return 0; |
2692 | } | |
2693 | ||
ae9242c8 SH |
2694 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2695 | ||
7b379ab3 | 2696 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2697 | { |
26ddeedd | 2698 | int i; |
0fd73091 | 2699 | struct lxc_conf *new; |
7b379ab3 | 2700 | |
13277ec4 | 2701 | new = malloc(sizeof(*new)); |
0fd73091 | 2702 | if (!new) |
7b379ab3 | 2703 | return NULL; |
7b379ab3 MN |
2704 | memset(new, 0, sizeof(*new)); |
2705 | ||
4b73005c | 2706 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
cccc74b5 | 2707 | new->personality = -1; |
124fa0a8 | 2708 | new->autodev = 1; |
3a784510 | 2709 | new->console.buffer_size = 0; |
596a818d DE |
2710 | new->console.log_path = NULL; |
2711 | new->console.log_fd = -1; | |
861813e5 | 2712 | new->console.log_size = 0; |
28a4b0e5 | 2713 | new->console.path = NULL; |
63376d7d | 2714 | new->console.peer = -1; |
fb87aa6a CB |
2715 | new->console.proxy.busy = -1; |
2716 | new->console.proxy.master = -1; | |
2717 | new->console.proxy.slave = -1; | |
63376d7d DL |
2718 | new->console.master = -1; |
2719 | new->console.slave = -1; | |
2720 | new->console.name[0] = '\0'; | |
732375f5 | 2721 | memset(&new->console.ringbuf, 0, sizeof(struct lxc_ringbuf)); |
d2e30e99 | 2722 | new->maincmd_fd = -1; |
258f8051 | 2723 | new->monitor_signal_pdeath = SIGKILL; |
76a26f55 | 2724 | new->nbd_idx = -1; |
54c30e29 | 2725 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 2726 | if (!new->rootfs.mount) { |
53f3f048 SH |
2727 | free(new); |
2728 | return NULL; | |
2729 | } | |
6e54330c | 2730 | new->rootfs.managed = true; |
858377e4 | 2731 | new->logfd = -1; |
7b379ab3 | 2732 | lxc_list_init(&new->cgroup); |
54860ed0 | 2733 | lxc_list_init(&new->cgroup2); |
7b379ab3 MN |
2734 | lxc_list_init(&new->network); |
2735 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2736 | lxc_list_init(&new->caps); |
1fb86a7c | 2737 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2738 | lxc_list_init(&new->id_map); |
46ad64ab CB |
2739 | new->root_nsuid_map = NULL; |
2740 | new->root_nsgid_map = NULL; | |
f979ac15 | 2741 | lxc_list_init(&new->includes); |
4184c3e1 | 2742 | lxc_list_init(&new->aliens); |
7c661726 | 2743 | lxc_list_init(&new->environment); |
c6d09e15 | 2744 | lxc_list_init(&new->limits); |
7edd0540 | 2745 | lxc_list_init(&new->sysctls); |
61d7a733 | 2746 | lxc_list_init(&new->procs); |
44ae0fb6 | 2747 | new->hooks_version = 0; |
28d9e29e | 2748 | for (i = 0; i < NUM_LXC_HOOKS; i++) |
26ddeedd | 2749 | lxc_list_init(&new->hooks[i]); |
ee1e7aa0 | 2750 | lxc_list_init(&new->groups); |
d39b10eb | 2751 | lxc_list_init(&new->state_clients); |
fe4de9a6 | 2752 | new->lsm_aa_profile = NULL; |
1800f924 | 2753 | lxc_list_init(&new->lsm_aa_raw); |
fe4de9a6 | 2754 | new->lsm_se_context = NULL; |
7a0bcca3 | 2755 | new->tmp_umount_proc = false; |
7a41e857 LT |
2756 | new->tmp_umount_proc = 0; |
2757 | new->shmount.path_host = NULL; | |
2758 | new->shmount.path_cont = NULL; | |
7b379ab3 | 2759 | |
72bb04e4 PT |
2760 | /* if running in a new user namespace, init and COMMAND |
2761 | * default to running as UID/GID 0 when using lxc-execute */ | |
2762 | new->init_uid = 0; | |
2763 | new->init_gid = 0; | |
43654d34 | 2764 | memset(&new->cgroup_meta, 0, sizeof(struct lxc_cgroup)); |
b074bbf1 | 2765 | memset(&new->ns_share, 0, sizeof(char *) * LXC_NS_MAX); |
72bb04e4 | 2766 | |
7b379ab3 | 2767 | return new; |
089cd8b8 DL |
2768 | } |
2769 | ||
344c9d81 | 2770 | int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
a19b974f | 2771 | size_t buf_size) |
f6d3e3e4 | 2772 | { |
41e00749 | 2773 | __do_close_prot_errno int fd = -EBADF; |
76bcd422 | 2774 | int ret; |
6b5a54cd | 2775 | char path[PATH_MAX]; |
f6d3e3e4 | 2776 | |
a19b974f | 2777 | if (geteuid() != 0 && idtype == ID_TYPE_GID) { |
76bcd422 | 2778 | __do_close_prot_errno int setgroups_fd = -EBADF; |
a19b974f | 2779 | |
6b5a54cd CB |
2780 | ret = snprintf(path, PATH_MAX, "/proc/%d/setgroups", pid); |
2781 | if (ret < 0 || ret >= PATH_MAX) | |
a19b974f | 2782 | return -E2BIG; |
a19b974f | 2783 | |
76bcd422 CB |
2784 | setgroups_fd = open(path, O_WRONLY); |
2785 | if (setgroups_fd < 0 && errno != ENOENT) { | |
a19b974f CB |
2786 | SYSERROR("Failed to open \"%s\"", path); |
2787 | return -1; | |
2788 | } | |
2789 | ||
76bcd422 CB |
2790 | if (setgroups_fd >= 0) { |
2791 | ret = lxc_write_nointr(setgroups_fd, "deny\n", | |
2792 | STRLITERALLEN("deny\n")); | |
2793 | if (ret != STRLITERALLEN("deny\n")) { | |
2794 | SYSERROR("Failed to write \"deny\" to \"/proc/%d/setgroups\"", pid); | |
2388737b CB |
2795 | return -1; |
2796 | } | |
395b1a3e | 2797 | TRACE("Wrote \"deny\" to \"/proc/%d/setgroups\"", pid); |
a19b974f | 2798 | } |
a19b974f CB |
2799 | } |
2800 | ||
6b5a54cd | 2801 | ret = snprintf(path, PATH_MAX, "/proc/%d/%cid_map", pid, |
29053180 | 2802 | idtype == ID_TYPE_UID ? 'u' : 'g'); |
6b5a54cd | 2803 | if (ret < 0 || ret >= PATH_MAX) |
f6d3e3e4 | 2804 | return -E2BIG; |
29053180 CB |
2805 | |
2806 | fd = open(path, O_WRONLY); | |
2807 | if (fd < 0) { | |
a19b974f | 2808 | SYSERROR("Failed to open \"%s\"", path); |
29053180 | 2809 | return -1; |
f6d3e3e4 | 2810 | } |
29053180 | 2811 | |
29053180 CB |
2812 | ret = lxc_write_nointr(fd, buf, buf_size); |
2813 | if (ret != buf_size) { | |
a19b974f | 2814 | SYSERROR("Failed to write %cid mapping to \"%s\"", |
29053180 | 2815 | idtype == ID_TYPE_UID ? 'u' : 'g', path); |
29053180 CB |
2816 | return -1; |
2817 | } | |
29053180 CB |
2818 | |
2819 | return 0; | |
f6d3e3e4 SH |
2820 | } |
2821 | ||
6e50e704 CB |
2822 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
2823 | * | |
2824 | * @return 1 if functional binary was found | |
2825 | * @return 0 if binary exists but is lacking privilege | |
2826 | * @return -ENOENT if binary does not exist | |
2827 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
6e50e704 | 2828 | */ |
df6a2945 CB |
2829 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
2830 | { | |
48411df2 | 2831 | __do_free char *path = NULL; |
df6a2945 CB |
2832 | int ret; |
2833 | struct stat st; | |
df6a2945 | 2834 | |
3275932b | 2835 | errno = EINVAL; |
6e50e704 | 2836 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
3275932b | 2837 | return -1; |
6e50e704 | 2838 | |
3275932b | 2839 | errno = ENOENT; |
df6a2945 CB |
2840 | path = on_path(binary, NULL); |
2841 | if (!path) | |
3275932b | 2842 | return -1; |
df6a2945 CB |
2843 | |
2844 | ret = stat(path, &st); | |
3275932b CB |
2845 | if (ret < 0) |
2846 | return -1; | |
df6a2945 CB |
2847 | |
2848 | /* Check if the binary is setuid. */ | |
2849 | if (st.st_mode & S_ISUID) { | |
0fd73091 | 2850 | DEBUG("The binary \"%s\" does have the setuid bit set", path); |
3275932b | 2851 | return 1; |
df6a2945 CB |
2852 | } |
2853 | ||
0fd73091 | 2854 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
2855 | /* Check if it has the CAP_SETUID capability. */ |
2856 | if ((cap & CAP_SETUID) && | |
2857 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
2858 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) { | |
2859 | DEBUG("The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE " | |
0fd73091 | 2860 | "and CAP_PERMITTED sets", path); |
3275932b | 2861 | return 1; |
df6a2945 CB |
2862 | } |
2863 | ||
2864 | /* Check if it has the CAP_SETGID capability. */ | |
2865 | if ((cap & CAP_SETGID) && | |
2866 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
2867 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) { | |
2868 | DEBUG("The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE " | |
0fd73091 | 2869 | "and CAP_PERMITTED sets", path); |
3275932b | 2870 | return 1; |
df6a2945 | 2871 | } |
0fd73091 | 2872 | #else |
69924fff CB |
2873 | /* If we cannot check for file capabilities we need to give the benefit |
2874 | * of the doubt. Otherwise we might fail even though all the necessary | |
2875 | * file capabilities are set. | |
2876 | */ | |
ffc40301 | 2877 | DEBUG("Cannot check for file capabilities as full capability support is " |
0fd73091 | 2878 | "missing. Manual intervention needed"); |
0fd73091 | 2879 | #endif |
df6a2945 | 2880 | |
3275932b | 2881 | return 1; |
df6a2945 CB |
2882 | } |
2883 | ||
986ef930 CB |
2884 | int lxc_map_ids_exec_wrapper(void *args) |
2885 | { | |
2886 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
2887 | return -1; | |
2888 | } | |
2889 | ||
f6d3e3e4 SH |
2890 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) |
2891 | { | |
0fd73091 | 2892 | int fill, left; |
986ef930 | 2893 | char u_or_g; |
4bc3b759 | 2894 | char *pos; |
6b5a54cd | 2895 | char cmd_output[PATH_MAX]; |
0fd73091 CB |
2896 | struct id_map *map; |
2897 | struct lxc_list *iterator; | |
2898 | enum idtype type; | |
986ef930 CB |
2899 | /* strlen("new@idmap") = 9 |
2900 | * + | |
2901 | * strlen(" ") = 1 | |
2902 | * + | |
d33968ad | 2903 | * INTTYPE_TO_STRLEN(uint32_t) |
986ef930 CB |
2904 | * + |
2905 | * strlen(" ") = 1 | |
2906 | * | |
2907 | * We add some additional space to make sure that we really have | |
2908 | * LXC_IDMAPLEN bytes available for our the {g,u]id mapping. | |
2909 | */ | |
0fd73091 | 2910 | int ret = 0, gidmap = 0, uidmap = 0; |
d33968ad | 2911 | char mapbuf[9 + 1 + INTTYPE_TO_STRLEN(uint32_t) + 1 + LXC_IDMAPLEN] = {0}; |
0fd73091 | 2912 | bool had_entry = false, use_shadow = false; |
c724025c JC |
2913 | int hostuid, hostgid; |
2914 | ||
2915 | hostuid = geteuid(); | |
2916 | hostgid = getegid(); | |
df6a2945 CB |
2917 | |
2918 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid | |
2919 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
2920 | * will protected it by preventing another user from being handed the |
2921 | * range by shadow. | |
2922 | */ | |
df6a2945 | 2923 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
2924 | if (uidmap == -ENOENT) |
2925 | WARN("newuidmap binary is missing"); | |
2926 | else if (!uidmap) | |
2927 | WARN("newuidmap is lacking necessary privileges"); | |
2928 | ||
df6a2945 | 2929 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
2930 | if (gidmap == -ENOENT) |
2931 | WARN("newgidmap binary is missing"); | |
2932 | else if (!gidmap) | |
2933 | WARN("newgidmap is lacking necessary privileges"); | |
2934 | ||
df6a2945 | 2935 | if (uidmap > 0 && gidmap > 0) { |
0fd73091 | 2936 | DEBUG("Functional newuidmap and newgidmap binary found"); |
4bc3b759 | 2937 | use_shadow = true; |
df6a2945 | 2938 | } else { |
99d43365 CB |
2939 | /* In case unprivileged users run application containers via |
2940 | * execute() or a start*() there are valid cases where they may | |
2941 | * only want to map their own {g,u}id. Let's not block them from | |
2942 | * doing so by requiring geteuid() == 0. | |
2943 | */ | |
2944 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
c724025c JC |
2945 | "write directly with euid %d", hostuid); |
2946 | } | |
2947 | ||
2948 | /* Check if we really need to use newuidmap and newgidmap. | |
2949 | * If the user is only remapping his own {g,u}id, we don't need it. | |
2950 | */ | |
2951 | if (use_shadow && lxc_list_len(idmap) == 2) { | |
2952 | use_shadow = false; | |
2953 | lxc_list_for_each(iterator, idmap) { | |
2954 | map = iterator->elem; | |
2955 | if (map->idtype == ID_TYPE_UID && map->range == 1 && | |
2956 | map->nsid == hostuid && map->hostid == hostuid) | |
2957 | continue; | |
2958 | if (map->idtype == ID_TYPE_GID && map->range == 1 && | |
2959 | map->nsid == hostgid && map->hostid == hostgid) | |
2960 | continue; | |
2961 | use_shadow = true; | |
2962 | break; | |
2963 | } | |
0e6e3a41 | 2964 | } |
251d0d2a | 2965 | |
986ef930 CB |
2966 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
2967 | type++, u_or_g = 'g') { | |
2968 | pos = mapbuf; | |
2969 | ||
0e6e3a41 | 2970 | if (use_shadow) |
986ef930 | 2971 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 2972 | |
cf3ef16d | 2973 | lxc_list_for_each(iterator, idmap) { |
251d0d2a | 2974 | map = iterator->elem; |
cf3ef16d SH |
2975 | if (map->idtype != type) |
2976 | continue; | |
2977 | ||
4bc3b759 CB |
2978 | had_entry = true; |
2979 | ||
986ef930 | 2980 | left = LXC_IDMAPLEN - (pos - mapbuf); |
d1838f34 | 2981 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
2982 | use_shadow ? " " : "", map->nsid, |
2983 | map->hostid, map->range, | |
0e6e3a41 | 2984 | use_shadow ? "" : "\n"); |
a427e268 CB |
2985 | if (fill <= 0 || fill >= left) { |
2986 | /* The kernel only takes <= 4k for writes to | |
2987 | * /proc/<pid>/{g,u}id_map | |
2988 | */ | |
2989 | SYSERROR("Too many %cid mappings defined", u_or_g); | |
2990 | return -1; | |
2991 | } | |
4bc3b759 | 2992 | |
cf3ef16d | 2993 | pos += fill; |
251d0d2a | 2994 | } |
cf3ef16d | 2995 | if (!had_entry) |
4f7521b4 | 2996 | continue; |
cf3ef16d | 2997 | |
d85813cd | 2998 | /* Try to catch the output of new{g,u}idmap to make debugging |
986ef930 CB |
2999 | * easier. |
3000 | */ | |
3001 | if (use_shadow) { | |
3002 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3003 | lxc_map_ids_exec_wrapper, | |
3004 | (void *)mapbuf); | |
3005 | if (ret < 0) { | |
54fbbeb5 CB |
3006 | ERROR("new%cidmap failed to write mapping \"%s\": %s", |
3007 | u_or_g, cmd_output, mapbuf); | |
986ef930 CB |
3008 | return -1; |
3009 | } | |
54fbbeb5 | 3010 | TRACE("new%cidmap wrote mapping \"%s\"", u_or_g, mapbuf); |
d1838f34 | 3011 | } else { |
986ef930 | 3012 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
54fbbeb5 | 3013 | if (ret < 0) { |
da0f9977 | 3014 | ERROR("Failed to write mapping: %s", mapbuf); |
986ef930 | 3015 | return -1; |
54fbbeb5 CB |
3016 | } |
3017 | TRACE("Wrote mapping \"%s\"", mapbuf); | |
d1838f34 | 3018 | } |
986ef930 CB |
3019 | |
3020 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 3021 | } |
251d0d2a | 3022 | |
986ef930 | 3023 | return 0; |
f6d3e3e4 SH |
3024 | } |
3025 | ||
0fd73091 | 3026 | /* Return the host uid/gid to which the container root is mapped in val. |
0b3a6504 | 3027 | * Return true if id was found, false otherwise. |
cf3ef16d | 3028 | */ |
2a9a80cb | 3029 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
4160c3a0 | 3030 | unsigned long *val) |
cf3ef16d | 3031 | { |
4160c3a0 | 3032 | unsigned nsid; |
0fd73091 CB |
3033 | struct id_map *map; |
3034 | struct lxc_list *it; | |
4160c3a0 CB |
3035 | |
3036 | if (idtype == ID_TYPE_UID) | |
3037 | nsid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; | |
3038 | else | |
3039 | nsid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
cf3ef16d | 3040 | |
0fd73091 | 3041 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 3042 | map = it->elem; |
7b50c609 | 3043 | if (map->idtype != idtype) |
cf3ef16d | 3044 | continue; |
4160c3a0 | 3045 | if (map->nsid != nsid) |
cf3ef16d | 3046 | continue; |
2a9a80cb SH |
3047 | *val = map->hostid; |
3048 | return true; | |
cf3ef16d | 3049 | } |
4160c3a0 | 3050 | |
2a9a80cb | 3051 | return false; |
cf3ef16d SH |
3052 | } |
3053 | ||
2133f58c | 3054 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3055 | { |
cf3ef16d | 3056 | struct id_map *map; |
0fd73091 CB |
3057 | struct lxc_list *it; |
3058 | ||
3059 | lxc_list_for_each (it, &conf->id_map) { | |
cf3ef16d | 3060 | map = it->elem; |
2133f58c | 3061 | if (map->idtype != idtype) |
cf3ef16d | 3062 | continue; |
0fd73091 | 3063 | |
cf3ef16d | 3064 | if (id >= map->hostid && id < map->hostid + map->range) |
57d116ab | 3065 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 3066 | } |
0fd73091 | 3067 | |
57d116ab | 3068 | return -1; |
cf3ef16d SH |
3069 | } |
3070 | ||
339efad9 | 3071 | int find_unmapped_nsid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3072 | { |
cf3ef16d | 3073 | struct id_map *map; |
0fd73091 | 3074 | struct lxc_list *it; |
2133f58c | 3075 | unsigned int freeid = 0; |
0fd73091 | 3076 | |
cf3ef16d | 3077 | again: |
0fd73091 | 3078 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 3079 | map = it->elem; |
2133f58c | 3080 | if (map->idtype != idtype) |
cf3ef16d | 3081 | continue; |
0fd73091 | 3082 | |
cf3ef16d SH |
3083 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { |
3084 | freeid = map->nsid + map->range; | |
3085 | goto again; | |
3086 | } | |
3087 | } | |
0fd73091 | 3088 | |
cf3ef16d SH |
3089 | return freeid; |
3090 | } | |
3091 | ||
f4f52cb5 CB |
3092 | int chown_mapped_root_exec_wrapper(void *args) |
3093 | { | |
3094 | execvp("lxc-usernsexec", args); | |
3095 | return -1; | |
3096 | } | |
3097 | ||
0fd73091 | 3098 | /* chown_mapped_root: for an unprivileged user with uid/gid X to |
7b50c609 TS |
3099 | * chown a dir to subuid/subgid Y, he needs to run chown as root |
3100 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
3101 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
3102 | * root is privileged with respect to hostuid/hostgid X, allowing | |
3103 | * him to do the chown. | |
f6d3e3e4 | 3104 | */ |
41dc7155 | 3105 | int chown_mapped_root(const char *path, struct lxc_conf *conf) |
f6d3e3e4 | 3106 | { |
f4f52cb5 | 3107 | uid_t rootuid, rootgid; |
2a9a80cb | 3108 | unsigned long val; |
f4f52cb5 CB |
3109 | int hostuid, hostgid, ret; |
3110 | struct stat sb; | |
3111 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
3112 | char ugid[100]; | |
41dc7155 | 3113 | const char *args1[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3114 | "-m", map1, |
3115 | "-m", map2, | |
3116 | "-m", map3, | |
3117 | "-m", map5, | |
3118 | "--", "chown", ugid, path, | |
3119 | NULL}; | |
41dc7155 | 3120 | const char *args2[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3121 | "-m", map1, |
3122 | "-m", map2, | |
3123 | "-m", map3, | |
3124 | "-m", map4, | |
3125 | "-m", map5, | |
3126 | "--", "chown", ugid, path, | |
3127 | NULL}; | |
6b5a54cd | 3128 | char cmd_output[PATH_MAX]; |
f4f52cb5 CB |
3129 | |
3130 | hostuid = geteuid(); | |
3131 | hostgid = getegid(); | |
f6d3e3e4 | 3132 | |
2a9a80cb | 3133 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
bc80f098 | 3134 | ERROR("No uid mapping for container root"); |
c4d10a05 | 3135 | return -1; |
f6d3e3e4 | 3136 | } |
f4f52cb5 | 3137 | rootuid = (uid_t)val; |
0fd73091 | 3138 | |
7b50c609 | 3139 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { |
bc80f098 | 3140 | ERROR("No gid mapping for container root"); |
7b50c609 TS |
3141 | return -1; |
3142 | } | |
f4f52cb5 | 3143 | rootgid = (gid_t)val; |
2a9a80cb | 3144 | |
f4f52cb5 | 3145 | if (hostuid == 0) { |
7b50c609 | 3146 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3147 | ERROR("Error chowning %s", path); |
3148 | return -1; | |
3149 | } | |
0fd73091 | 3150 | |
c4d10a05 SH |
3151 | return 0; |
3152 | } | |
f3d7e4ca | 3153 | |
f4f52cb5 | 3154 | if (rootuid == hostuid) { |
1a0e70ac | 3155 | /* nothing to do */ |
b103ceac | 3156 | INFO("Container root is our uid; no need to chown"); |
f3d7e4ca SH |
3157 | return 0; |
3158 | } | |
3159 | ||
bbdbf8f0 | 3160 | /* save the current gid of "path" */ |
f4f52cb5 CB |
3161 | if (stat(path, &sb) < 0) { |
3162 | ERROR("Error stat %s", path); | |
f6d3e3e4 SH |
3163 | return -1; |
3164 | } | |
7b50c609 | 3165 | |
bbdbf8f0 CB |
3166 | /* Update the path argument in case this was overlayfs. */ |
3167 | args1[sizeof(args1) / sizeof(args1[0]) - 2] = path; | |
3168 | args2[sizeof(args2) / sizeof(args2[0]) - 2] = path; | |
3169 | ||
f4f52cb5 CB |
3170 | /* |
3171 | * A file has to be group-owned by a gid mapped into the | |
3172 | * container, or the container won't be privileged over it. | |
3173 | */ | |
3174 | DEBUG("trying to chown \"%s\" to %d", path, hostgid); | |
3175 | if (sb.st_uid == hostuid && | |
3176 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3177 | chown(path, -1, hostgid) < 0) { | |
3178 | ERROR("Failed chgrping %s", path); | |
3179 | return -1; | |
3180 | } | |
f6d3e3e4 | 3181 | |
1a0e70ac | 3182 | /* "u:0:rootuid:1" */ |
f4f52cb5 CB |
3183 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); |
3184 | if (ret < 0 || ret >= 100) { | |
3185 | ERROR("Error uid printing map string"); | |
3186 | return -1; | |
3187 | } | |
7b50c609 | 3188 | |
1a0e70ac | 3189 | /* "u:hostuid:hostuid:1" */ |
f4f52cb5 CB |
3190 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); |
3191 | if (ret < 0 || ret >= 100) { | |
3192 | ERROR("Error uid printing map string"); | |
3193 | return -1; | |
3194 | } | |
c4d10a05 | 3195 | |
1a0e70ac | 3196 | /* "g:0:rootgid:1" */ |
f4f52cb5 CB |
3197 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); |
3198 | if (ret < 0 || ret >= 100) { | |
3199 | ERROR("Error gid printing map string"); | |
3200 | return -1; | |
3201 | } | |
98e5ba51 | 3202 | |
1a0e70ac | 3203 | /* "g:pathgid:rootgid+pathgid:1" */ |
f4f52cb5 CB |
3204 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, |
3205 | rootgid + (gid_t)sb.st_gid); | |
3206 | if (ret < 0 || ret >= 100) { | |
3207 | ERROR("Error gid printing map string"); | |
3208 | return -1; | |
3209 | } | |
c4d10a05 | 3210 | |
1a0e70ac | 3211 | /* "g:hostgid:hostgid:1" */ |
f4f52cb5 CB |
3212 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); |
3213 | if (ret < 0 || ret >= 100) { | |
3214 | ERROR("Error gid printing map string"); | |
3215 | return -1; | |
3216 | } | |
7b50c609 | 3217 | |
1a0e70ac | 3218 | /* "0:pathgid" (chown) */ |
f4f52cb5 CB |
3219 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); |
3220 | if (ret < 0 || ret >= 100) { | |
3221 | ERROR("Error owner printing format string for chown"); | |
3222 | return -1; | |
3223 | } | |
7b50c609 | 3224 | |
f4f52cb5 CB |
3225 | if (hostgid == sb.st_gid) |
3226 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3227 | chown_mapped_root_exec_wrapper, | |
3228 | (void *)args1); | |
3229 | else | |
3230 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3231 | chown_mapped_root_exec_wrapper, | |
3232 | (void *)args2); | |
3233 | if (ret < 0) | |
3234 | ERROR("lxc-usernsexec failed: %s", cmd_output); | |
7b50c609 | 3235 | |
f4f52cb5 | 3236 | return ret; |
f6d3e3e4 SH |
3237 | } |
3238 | ||
943144d9 CB |
3239 | /* NOTE: Must not be called from inside the container namespace! */ |
3240 | int lxc_create_tmp_proc_mount(struct lxc_conf *conf) | |
5112cd70 SH |
3241 | { |
3242 | int mounted; | |
3243 | ||
943144d9 | 3244 | mounted = lxc_mount_proc_if_needed(conf->rootfs.path ? conf->rootfs.mount : ""); |
5112cd70 | 3245 | if (mounted == -1) { |
0fd73091 | 3246 | SYSERROR("Failed to mount proc in the container"); |
01958b1f | 3247 | /* continue only if there is no rootfs */ |
943144d9 | 3248 | if (conf->rootfs.path) |
01958b1f | 3249 | return -1; |
5112cd70 | 3250 | } else if (mounted == 1) { |
7a0bcca3 | 3251 | conf->tmp_umount_proc = true; |
5112cd70 | 3252 | } |
943144d9 | 3253 | |
5112cd70 SH |
3254 | return 0; |
3255 | } | |
3256 | ||
3257 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3258 | { | |
7a0bcca3 | 3259 | if (!lxc_conf->tmp_umount_proc) |
0fd73091 CB |
3260 | return; |
3261 | ||
7a0bcca3 CB |
3262 | (void)umount2("/proc", MNT_DETACH); |
3263 | lxc_conf->tmp_umount_proc = false; | |
5112cd70 SH |
3264 | } |
3265 | ||
0fd73091 | 3266 | /* Walk /proc/mounts and change any shared entries to slave. */ |
6a0c909a | 3267 | void remount_all_slave(void) |
e995d7a2 | 3268 | { |
7969675f | 3269 | __do_free char *line = NULL; |
003be47b CB |
3270 | __do_fclose FILE *f = NULL; |
3271 | __do_close_prot_errno int memfd = -EBADF, mntinfo_fd = -EBADF; | |
3272 | int ret; | |
6a49f05e | 3273 | ssize_t copied; |
e995d7a2 SH |
3274 | size_t len = 0; |
3275 | ||
6a49f05e | 3276 | mntinfo_fd = open("/proc/self/mountinfo", O_RDONLY | O_CLOEXEC); |
fea3b91d DJ |
3277 | if (mntinfo_fd < 0) { |
3278 | SYSERROR("Failed to open \"/proc/self/mountinfo\""); | |
6a49f05e | 3279 | return; |
fea3b91d | 3280 | } |
6a49f05e CB |
3281 | |
3282 | memfd = memfd_create(".lxc_mountinfo", MFD_CLOEXEC); | |
3283 | if (memfd < 0) { | |
3284 | char template[] = P_tmpdir "/.lxc_mountinfo_XXXXXX"; | |
3285 | ||
3286 | if (errno != ENOSYS) { | |
fea3b91d | 3287 | SYSERROR("Failed to create temporary in-memory file"); |
6a49f05e CB |
3288 | return; |
3289 | } | |
3290 | ||
3291 | memfd = lxc_make_tmpfile(template, true); | |
fea3b91d | 3292 | if (memfd < 0) { |
fea3b91d DJ |
3293 | WARN("Failed to create temporary file"); |
3294 | return; | |
3295 | } | |
6a49f05e CB |
3296 | } |
3297 | ||
6a49f05e | 3298 | again: |
7c4d9466 | 3299 | copied = lxc_sendfile_nointr(memfd, mntinfo_fd, NULL, LXC_SENDFILE_MAX); |
6a49f05e CB |
3300 | if (copied < 0) { |
3301 | if (errno == EINTR) | |
3302 | goto again; | |
3303 | ||
fea3b91d | 3304 | SYSERROR("Failed to copy \"/proc/self/mountinfo\""); |
6a49f05e CB |
3305 | return; |
3306 | } | |
6a49f05e | 3307 | |
6a49f05e CB |
3308 | ret = lseek(memfd, 0, SEEK_SET); |
3309 | if (ret < 0) { | |
fea3b91d | 3310 | SYSERROR("Failed to reset file descriptor offset"); |
6a49f05e CB |
3311 | return; |
3312 | } | |
3313 | ||
3314 | f = fdopen(memfd, "r"); | |
e995d7a2 | 3315 | if (!f) { |
003be47b | 3316 | SYSERROR("Failed to open copy of \"/proc/self/mountinfo\" to mark all shared. Continuing"); |
e995d7a2 SH |
3317 | return; |
3318 | } | |
3319 | ||
003be47b CB |
3320 | /* |
3321 | * After a successful fdopen() memfd will be closed when calling | |
3322 | * fclose(f). Calling close(memfd) afterwards is undefined. | |
3323 | */ | |
3324 | move_fd(memfd); | |
3325 | ||
e995d7a2 | 3326 | while (getline(&line, &len, f) != -1) { |
0fd73091 CB |
3327 | char *opts, *target; |
3328 | ||
e995d7a2 SH |
3329 | target = get_field(line, 4); |
3330 | if (!target) | |
3331 | continue; | |
0fd73091 | 3332 | |
e995d7a2 SH |
3333 | opts = get_field(target, 2); |
3334 | if (!opts) | |
3335 | continue; | |
0fd73091 | 3336 | |
e995d7a2 SH |
3337 | null_endofword(opts); |
3338 | if (!strstr(opts, "shared")) | |
3339 | continue; | |
0fd73091 | 3340 | |
e995d7a2 | 3341 | null_endofword(target); |
0fd73091 CB |
3342 | ret = mount(NULL, target, NULL, MS_SLAVE, NULL); |
3343 | if (ret < 0) { | |
3344 | SYSERROR("Failed to make \"%s\" MS_SLAVE", target); | |
e995d7a2 | 3345 | ERROR("Continuing..."); |
6a49f05e | 3346 | continue; |
e995d7a2 | 3347 | } |
6a49f05e | 3348 | TRACE("Remounted \"%s\" as MS_SLAVE", target); |
e995d7a2 | 3349 | } |
6a49f05e | 3350 | TRACE("Remounted all mount table entries as MS_SLAVE"); |
e995d7a2 SH |
3351 | } |
3352 | ||
794248d0 | 3353 | static int lxc_execute_bind_init(struct lxc_handler *handler) |
2322903b SH |
3354 | { |
3355 | int ret; | |
794248d0 CB |
3356 | char *p; |
3357 | char path[PATH_MAX], destpath[PATH_MAX]; | |
3358 | struct lxc_conf *conf = handler->conf; | |
9d9c111c SH |
3359 | |
3360 | /* If init exists in the container, don't bind mount a static one */ | |
3361 | p = choose_init(conf->rootfs.mount); | |
3362 | if (p) { | |
22f835ba | 3363 | __do_free char *old = p; |
41089848 TA |
3364 | |
3365 | p = strdup(old + strlen(conf->rootfs.mount)); | |
41089848 TA |
3366 | if (!p) |
3367 | return -ENOMEM; | |
3368 | ||
3369 | INFO("Found existing init at \"%s\"", p); | |
3370 | goto out; | |
9d9c111c | 3371 | } |
2322903b SH |
3372 | |
3373 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
0fd73091 | 3374 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3375 | return -1; |
2322903b SH |
3376 | |
3377 | if (!file_exists(path)) { | |
0fd73091 | 3378 | ERROR("The file \"%s\" does not exist on host", path); |
8353b4c9 | 3379 | return -1; |
2322903b SH |
3380 | } |
3381 | ||
794248d0 | 3382 | ret = snprintf(destpath, PATH_MAX, "%s" P_tmpdir "%s", conf->rootfs.mount, "/.lxc-init"); |
0fd73091 | 3383 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3384 | return -1; |
2322903b SH |
3385 | |
3386 | if (!file_exists(destpath)) { | |
794248d0 CB |
3387 | ret = mknod(destpath, S_IFREG | 0000, 0); |
3388 | if (ret < 0 && errno != EEXIST) { | |
3389 | SYSERROR("Failed to create dummy \"%s\" file as bind mount target", destpath); | |
8353b4c9 | 3390 | return -1; |
2322903b | 3391 | } |
2322903b SH |
3392 | } |
3393 | ||
592fd47a | 3394 | ret = safe_mount(path, destpath, "none", MS_BIND, NULL, conf->rootfs.mount); |
8353b4c9 | 3395 | if (ret < 0) { |
0fd73091 | 3396 | SYSERROR("Failed to bind mount lxc.init.static into container"); |
8353b4c9 CB |
3397 | return -1; |
3398 | } | |
3399 | ||
794248d0 CB |
3400 | p = strdup(destpath + strlen(conf->rootfs.mount)); |
3401 | if (!p) | |
3402 | return -ENOMEM; | |
794248d0 | 3403 | |
8353b4c9 | 3404 | INFO("Bind mounted lxc.init.static into container at \"%s\"", path); |
41089848 | 3405 | out: |
4b5b3a2a | 3406 | ((struct execute_args *)handler->data)->init_fd = -1; |
41089848 | 3407 | ((struct execute_args *)handler->data)->init_path = p; |
8353b4c9 | 3408 | return 0; |
2322903b SH |
3409 | } |
3410 | ||
0fd73091 CB |
3411 | /* This does the work of remounting / if it is shared, calling the container |
3412 | * pre-mount hooks, and mounting the rootfs. | |
35120d9c | 3413 | */ |
8ce1abc2 CB |
3414 | int lxc_setup_rootfs_prepare_root(struct lxc_conf *conf, const char *name, |
3415 | const char *lxcpath) | |
0ad19a3f | 3416 | { |
0fd73091 CB |
3417 | int ret; |
3418 | ||
35120d9c | 3419 | if (conf->rootfs_setup) { |
35120d9c | 3420 | const char *path = conf->rootfs.mount; |
0fd73091 CB |
3421 | |
3422 | /* The rootfs was set up in another namespace. bind-mount it to | |
3423 | * give us a mount in our own ns so we can pivot_root to it | |
3424 | */ | |
3425 | ret = mount(path, path, "rootfs", MS_BIND, NULL); | |
3426 | if (ret < 0) { | |
3427 | ERROR("Failed to bind mount container / onto itself"); | |
145832ba | 3428 | return -1; |
35120d9c | 3429 | } |
0fd73091 CB |
3430 | |
3431 | TRACE("Bind mounted container / onto itself"); | |
145832ba | 3432 | return 0; |
35120d9c | 3433 | } |
d4ef7c50 | 3434 | |
e995d7a2 SH |
3435 | remount_all_slave(); |
3436 | ||
0fd73091 CB |
3437 | ret = run_lxc_hooks(name, "pre-mount", conf, NULL); |
3438 | if (ret < 0) { | |
3439 | ERROR("Failed to run pre-mount hooks"); | |
35120d9c SH |
3440 | return -1; |
3441 | } | |
3442 | ||
8ce1abc2 | 3443 | ret = lxc_mount_rootfs(conf); |
0fd73091 CB |
3444 | if (ret < 0) { |
3445 | ERROR("Failed to setup rootfs for"); | |
35120d9c SH |
3446 | return -1; |
3447 | } | |
3448 | ||
3449 | conf->rootfs_setup = true; | |
3450 | return 0; | |
3451 | } | |
3452 | ||
1c1c7051 SH |
3453 | static bool verify_start_hooks(struct lxc_conf *conf) |
3454 | { | |
6b5a54cd | 3455 | char path[PATH_MAX]; |
0fd73091 CB |
3456 | struct lxc_list *it; |
3457 | ||
3458 | lxc_list_for_each (it, &conf->hooks[LXCHOOK_START]) { | |
1c1c7051 | 3459 | int ret; |
0fd73091 | 3460 | char *hookname = it->elem; |
1c1c7051 | 3461 | |
6b5a54cd | 3462 | ret = snprintf(path, PATH_MAX, "%s%s", |
0fd73091 CB |
3463 | conf->rootfs.path ? conf->rootfs.mount : "", |
3464 | hookname); | |
6b5a54cd | 3465 | if (ret < 0 || ret >= PATH_MAX) |
1c1c7051 | 3466 | return false; |
0fd73091 | 3467 | |
75193660 | 3468 | ret = access(path, X_OK); |
0fd73091 | 3469 | if (ret < 0) { |
75193660 | 3470 | SYSERROR("Start hook \"%s\" not found in container", |
0fd73091 | 3471 | hookname); |
1c1c7051 SH |
3472 | return false; |
3473 | } | |
0fd73091 | 3474 | |
6a0c909a | 3475 | return true; |
1c1c7051 SH |
3476 | } |
3477 | ||
3478 | return true; | |
3479 | } | |
3480 | ||
4b5b3a2a TA |
3481 | static bool execveat_supported(void) |
3482 | { | |
13be2733 | 3483 | lxc_raw_execveat(-1, "", NULL, NULL, AT_EMPTY_PATH); |
4b5b3a2a TA |
3484 | if (errno == ENOSYS) |
3485 | return false; | |
3486 | ||
3487 | return true; | |
4b5b3a2a TA |
3488 | } |
3489 | ||
3b988b33 | 3490 | int lxc_setup(struct lxc_handler *handler) |
35120d9c | 3491 | { |
2187efd3 | 3492 | int ret; |
0fd73091 | 3493 | const char *lxcpath = handler->lxcpath, *name = handler->name; |
35120d9c | 3494 | struct lxc_conf *lxc_conf = handler->conf; |
35120d9c | 3495 | |
8ce1abc2 | 3496 | ret = lxc_setup_rootfs_prepare_root(lxc_conf, name, lxcpath); |
8353b4c9 CB |
3497 | if (ret < 0) { |
3498 | ERROR("Failed to setup rootfs"); | |
35120d9c SH |
3499 | return -1; |
3500 | } | |
3501 | ||
28d9e29e | 3502 | if (handler->nsfd[LXC_NS_UTS] == -1) { |
8353b4c9 CB |
3503 | ret = setup_utsname(lxc_conf->utsname); |
3504 | if (ret < 0) { | |
0fd73091 | 3505 | ERROR("Failed to setup the utsname %s", name); |
6c544cb3 MM |
3506 | return -1; |
3507 | } | |
0ad19a3f | 3508 | } |
3509 | ||
b25291da CB |
3510 | ret = lxc_setup_keyring(); |
3511 | if (ret < 0) | |
3512 | return -1; | |
3513 | ||
8353b4c9 CB |
3514 | ret = lxc_setup_network_in_child_namespaces(lxc_conf, &lxc_conf->network); |
3515 | if (ret < 0) { | |
3516 | ERROR("Failed to setup network"); | |
95b5ffaf | 3517 | return -1; |
0ad19a3f | 3518 | } |
3519 | ||
8353b4c9 CB |
3520 | ret = lxc_network_send_name_and_ifindex_to_parent(handler); |
3521 | if (ret < 0) { | |
3522 | ERROR("Failed to send network device names and ifindices to parent"); | |
790255cf CB |
3523 | return -1; |
3524 | } | |
3525 | ||
bc6928ff | 3526 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3527 | ret = mount_autodev(name, &lxc_conf->rootfs, lxcpath); |
3528 | if (ret < 0) { | |
3529 | ERROR("Failed to mount \"/dev\""); | |
c6883f38 SH |
3530 | return -1; |
3531 | } | |
3532 | } | |
3533 | ||
8353b4c9 CB |
3534 | /* Do automatic mounts (mainly /proc and /sys), but exclude those that |
3535 | * need to wait until other stuff has finished. | |
368bbc02 | 3536 | */ |
8353b4c9 CB |
3537 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler); |
3538 | if (ret < 0) { | |
3539 | ERROR("Failed to setup first automatic mounts"); | |
368bbc02 CS |
3540 | return -1; |
3541 | } | |
3542 | ||
8353b4c9 CB |
3543 | ret = setup_mount(lxc_conf, &lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath); |
3544 | if (ret < 0) { | |
3545 | ERROR("Failed to setup mounts"); | |
95b5ffaf | 3546 | return -1; |
576f946d | 3547 | } |
3548 | ||
c631115d FA |
3549 | if (!lxc_list_empty(&lxc_conf->mount_list)) { |
3550 | ret = setup_mount_entries(lxc_conf, &lxc_conf->rootfs, | |
3551 | &lxc_conf->mount_list, name, lxcpath); | |
3552 | if (ret < 0) { | |
3553 | ERROR("Failed to setup mount entries"); | |
3554 | return -1; | |
3555 | } | |
3556 | } | |
3557 | ||
8353b4c9 | 3558 | if (lxc_conf->is_execute) { |
4b5b3a2a TA |
3559 | if (execveat_supported()) { |
3560 | int fd; | |
3561 | char path[PATH_MAX]; | |
3562 | ||
3563 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
3564 | if (ret < 0 || ret >= PATH_MAX) { | |
3565 | ERROR("Path to init.lxc.static too long"); | |
3566 | return -1; | |
3567 | } | |
3568 | ||
3569 | fd = open(path, O_PATH | O_CLOEXEC); | |
3570 | if (fd < 0) { | |
3571 | SYSERROR("Unable to open lxc.init.static"); | |
3572 | return -1; | |
3573 | } | |
3574 | ||
3575 | ((struct execute_args *)handler->data)->init_fd = fd; | |
3576 | ((struct execute_args *)handler->data)->init_path = NULL; | |
3577 | } else { | |
3578 | ret = lxc_execute_bind_init(handler); | |
3579 | if (ret < 0) { | |
3580 | ERROR("Failed to bind-mount the lxc init system"); | |
3581 | return -1; | |
3582 | } | |
8353b4c9 CB |
3583 | } |
3584 | } | |
2322903b | 3585 | |
8353b4c9 CB |
3586 | /* Now mount only cgroups, if wanted. Before, /sys could not have been |
3587 | * mounted. It is guaranteed to be mounted now either through | |
3588 | * automatically or via fstab entries. | |
368bbc02 | 3589 | */ |
8353b4c9 CB |
3590 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler); |
3591 | if (ret < 0) { | |
3592 | ERROR("Failed to setup remaining automatic mounts"); | |
368bbc02 CS |
3593 | return -1; |
3594 | } | |
3595 | ||
8353b4c9 | 3596 | ret = run_lxc_hooks(name, "mount", lxc_conf, NULL); |
1a2cf89d | 3597 | if (ret < 0) { |
8353b4c9 | 3598 | ERROR("Failed to run mount hooks"); |
773fb9ca SH |
3599 | return -1; |
3600 | } | |
3601 | ||
bc6928ff | 3602 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3603 | ret = run_lxc_hooks(name, "autodev", lxc_conf, NULL); |
3604 | if (ret < 0) { | |
3605 | ERROR("Failed to run autodev hooks"); | |
f7bee6c6 MW |
3606 | return -1; |
3607 | } | |
06749971 | 3608 | |
8353b4c9 CB |
3609 | ret = lxc_fill_autodev(&lxc_conf->rootfs); |
3610 | if (ret < 0) { | |
3611 | ERROR("Failed to populate \"/dev\""); | |
91c3830e SH |
3612 | return -1; |
3613 | } | |
3614 | } | |
368bbc02 | 3615 | |
75193660 CB |
3616 | /* Make sure any start hooks are in the container */ |
3617 | if (!verify_start_hooks(lxc_conf)) { | |
3618 | ERROR("Failed to verify start hooks"); | |
3619 | return -1; | |
3620 | } | |
3621 | ||
ed8704d0 | 3622 | ret = lxc_setup_console(&lxc_conf->rootfs, &lxc_conf->console, |
885766f5 | 3623 | lxc_conf->ttys.dir); |
ed8704d0 CB |
3624 | if (ret < 0) { |
3625 | ERROR("Failed to setup console"); | |
95b5ffaf | 3626 | return -1; |
6e590161 | 3627 | } |
3628 | ||
ed8704d0 CB |
3629 | ret = lxc_setup_dev_symlinks(&lxc_conf->rootfs); |
3630 | if (ret < 0) { | |
8353b4c9 | 3631 | ERROR("Failed to setup \"/dev\" symlinks"); |
69aa6655 DE |
3632 | return -1; |
3633 | } | |
3634 | ||
8353b4c9 CB |
3635 | ret = lxc_create_tmp_proc_mount(lxc_conf); |
3636 | if (ret < 0) { | |
3637 | ERROR("Failed to \"/proc\" LSMs"); | |
e075f5d9 | 3638 | return -1; |
e075f5d9 | 3639 | } |
e075f5d9 | 3640 | |
8ce1abc2 | 3641 | ret = lxc_setup_rootfs_switch_root(&lxc_conf->rootfs); |
8353b4c9 CB |
3642 | if (ret < 0) { |
3643 | ERROR("Failed to pivot root into rootfs"); | |
95b5ffaf | 3644 | return -1; |
ed502555 | 3645 | } |
3646 | ||
8353b4c9 CB |
3647 | ret = lxc_setup_devpts(lxc_conf); |
3648 | if (ret < 0) { | |
3649 | ERROR("Failed to setup new devpts instance"); | |
95b5ffaf | 3650 | return -1; |
3c26f34e | 3651 | } |
3652 | ||
2187efd3 CB |
3653 | ret = lxc_create_ttys(handler); |
3654 | if (ret < 0) | |
e8bd4e43 | 3655 | return -1; |
e8bd4e43 | 3656 | |
8353b4c9 CB |
3657 | ret = setup_personality(lxc_conf->personality); |
3658 | if (ret < 0) { | |
3659 | ERROR("Failed to set personality"); | |
cccc74b5 DL |
3660 | return -1; |
3661 | } | |
3662 | ||
8353b4c9 CB |
3663 | /* Set sysctl value to a path under /proc/sys as determined from the |
3664 | * key. For e.g. net.ipv4.ip_forward translated to | |
3665 | * /proc/sys/net/ipv4/ip_forward. | |
7edd0540 L |
3666 | */ |
3667 | if (!lxc_list_empty(&lxc_conf->sysctls)) { | |
3668 | ret = setup_sysctl_parameters(&lxc_conf->sysctls); | |
8353b4c9 CB |
3669 | if (ret < 0) { |
3670 | ERROR("Failed to setup sysctl parameters"); | |
7edd0540 | 3671 | return -1; |
8353b4c9 | 3672 | } |
7edd0540 L |
3673 | } |
3674 | ||
97a8f74f SG |
3675 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
3676 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
8353b4c9 CB |
3677 | ERROR("Container requests lxc.cap.drop and " |
3678 | "lxc.cap.keep: either use lxc.cap.drop or " | |
3679 | "lxc.cap.keep, not both"); | |
f6d3e3e4 SH |
3680 | return -1; |
3681 | } | |
8353b4c9 | 3682 | |
97a8f74f | 3683 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
8353b4c9 | 3684 | ERROR("Failed to keep capabilities"); |
97a8f74f SG |
3685 | return -1; |
3686 | } | |
3687 | } else if (setup_caps(&lxc_conf->caps)) { | |
8353b4c9 | 3688 | ERROR("Failed to drop capabilities"); |
97a8f74f | 3689 | return -1; |
81810dd1 DL |
3690 | } |
3691 | ||
8353b4c9 | 3692 | NOTICE("The container \"%s\" is set up", name); |
cd54d859 | 3693 | |
0ad19a3f | 3694 | return 0; |
3695 | } | |
26ddeedd | 3696 | |
3f60c2f7 | 3697 | int run_lxc_hooks(const char *name, char *hookname, struct lxc_conf *conf, |
14a7b0f9 | 3698 | char *argv[]) |
26ddeedd | 3699 | { |
26ddeedd | 3700 | struct lxc_list *it; |
3f60c2f7 | 3701 | int which = -1; |
26ddeedd | 3702 | |
3f60c2f7 | 3703 | if (strcmp(hookname, "pre-start") == 0) |
26ddeedd | 3704 | which = LXCHOOK_PRESTART; |
3f60c2f7 | 3705 | else if (strcmp(hookname, "start-host") == 0) |
08dd2805 | 3706 | which = LXCHOOK_START_HOST; |
3f60c2f7 | 3707 | else if (strcmp(hookname, "pre-mount") == 0) |
5ea6163a | 3708 | which = LXCHOOK_PREMOUNT; |
3f60c2f7 | 3709 | else if (strcmp(hookname, "mount") == 0) |
26ddeedd | 3710 | which = LXCHOOK_MOUNT; |
3f60c2f7 | 3711 | else if (strcmp(hookname, "autodev") == 0) |
f7bee6c6 | 3712 | which = LXCHOOK_AUTODEV; |
3f60c2f7 | 3713 | else if (strcmp(hookname, "start") == 0) |
26ddeedd | 3714 | which = LXCHOOK_START; |
3f60c2f7 | 3715 | else if (strcmp(hookname, "stop") == 0) |
52492063 | 3716 | which = LXCHOOK_STOP; |
3f60c2f7 | 3717 | else if (strcmp(hookname, "post-stop") == 0) |
26ddeedd | 3718 | which = LXCHOOK_POSTSTOP; |
3f60c2f7 | 3719 | else if (strcmp(hookname, "clone") == 0) |
148e91f5 | 3720 | which = LXCHOOK_CLONE; |
3f60c2f7 | 3721 | else if (strcmp(hookname, "destroy") == 0) |
37cf711b | 3722 | which = LXCHOOK_DESTROY; |
26ddeedd SH |
3723 | else |
3724 | return -1; | |
3f60c2f7 | 3725 | |
0fd73091 | 3726 | lxc_list_for_each (it, &conf->hooks[which]) { |
26ddeedd | 3727 | int ret; |
3f60c2f7 CB |
3728 | char *hook = it->elem; |
3729 | ||
3730 | ret = run_script_argv(name, conf->hooks_version, "lxc", hook, | |
14a7b0f9 | 3731 | hookname, argv); |
3f60c2f7 CB |
3732 | if (ret < 0) |
3733 | return -1; | |
26ddeedd | 3734 | } |
3f60c2f7 | 3735 | |
26ddeedd SH |
3736 | return 0; |
3737 | } | |
72d0e1cb | 3738 | |
72d0e1cb SG |
3739 | int lxc_clear_config_caps(struct lxc_conf *c) |
3740 | { | |
1a0e70ac | 3741 | struct lxc_list *it, *next; |
72d0e1cb | 3742 | |
0fd73091 | 3743 | lxc_list_for_each_safe (it, &c->caps, next) { |
72d0e1cb SG |
3744 | lxc_list_del(it); |
3745 | free(it->elem); | |
3746 | free(it); | |
3747 | } | |
0fd73091 | 3748 | |
72d0e1cb SG |
3749 | return 0; |
3750 | } | |
3751 | ||
c7e345ae CB |
3752 | static int lxc_free_idmap(struct lxc_list *id_map) |
3753 | { | |
27c27d73 SH |
3754 | struct lxc_list *it, *next; |
3755 | ||
0fd73091 | 3756 | lxc_list_for_each_safe (it, id_map, next) { |
27c27d73 SH |
3757 | lxc_list_del(it); |
3758 | free(it->elem); | |
3759 | free(it); | |
3760 | } | |
c7e345ae | 3761 | |
27c27d73 SH |
3762 | return 0; |
3763 | } | |
3764 | ||
4355ab5f SH |
3765 | int lxc_clear_idmaps(struct lxc_conf *c) |
3766 | { | |
3767 | return lxc_free_idmap(&c->id_map); | |
3768 | } | |
3769 | ||
1fb86a7c SH |
3770 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
3771 | { | |
0fd73091 | 3772 | struct lxc_list *it, *next; |
1fb86a7c | 3773 | |
0fd73091 | 3774 | lxc_list_for_each_safe (it, &c->keepcaps, next) { |
1fb86a7c SH |
3775 | lxc_list_del(it); |
3776 | free(it->elem); | |
3777 | free(it); | |
3778 | } | |
0fd73091 | 3779 | |
1fb86a7c SH |
3780 | return 0; |
3781 | } | |
3782 | ||
a3ed9b81 | 3783 | int lxc_clear_namespace(struct lxc_conf *c) |
3784 | { | |
3785 | int i; | |
3786 | for (i = 0; i < LXC_NS_MAX; i++) { | |
3787 | free(c->ns_share[i]); | |
3788 | c->ns_share[i] = NULL; | |
3789 | } | |
3790 | return 0; | |
3791 | } | |
3792 | ||
54860ed0 | 3793 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version) |
72d0e1cb | 3794 | { |
54860ed0 | 3795 | char *global_token, *namespaced_token; |
ab1a6cac | 3796 | size_t namespaced_token_len; |
54860ed0 | 3797 | struct lxc_list *it, *next, *list; |
ab1a6cac | 3798 | const char *k = key; |
54860ed0 | 3799 | bool all = false; |
72d0e1cb | 3800 | |
54860ed0 CB |
3801 | if (version == CGROUP2_SUPER_MAGIC) { |
3802 | global_token = "lxc.cgroup2"; | |
3803 | namespaced_token = "lxc.cgroup2."; | |
6333c915 | 3804 | namespaced_token_len = STRLITERALLEN("lxc.cgroup2."); |
54860ed0 CB |
3805 | list = &c->cgroup2; |
3806 | } else if (version == CGROUP_SUPER_MAGIC) { | |
3807 | global_token = "lxc.cgroup"; | |
3808 | namespaced_token = "lxc.cgroup."; | |
6333c915 | 3809 | namespaced_token_len = STRLITERALLEN("lxc.cgroup."); |
54860ed0 CB |
3810 | list = &c->cgroup; |
3811 | } else { | |
ab1a6cac | 3812 | return -EINVAL; |
54860ed0 CB |
3813 | } |
3814 | ||
3815 | if (strcmp(key, global_token) == 0) | |
72d0e1cb | 3816 | all = true; |
6333c915 | 3817 | else if (strncmp(key, namespaced_token, namespaced_token_len) == 0) |
ab1a6cac | 3818 | k += namespaced_token_len; |
a6390f01 | 3819 | else |
ab1a6cac | 3820 | return -EINVAL; |
72d0e1cb | 3821 | |
0fd73091 | 3822 | lxc_list_for_each_safe (it, list, next) { |
72d0e1cb | 3823 | struct lxc_cgroup *cg = it->elem; |
54860ed0 | 3824 | |
72d0e1cb SG |
3825 | if (!all && strcmp(cg->subsystem, k) != 0) |
3826 | continue; | |
54860ed0 | 3827 | |
72d0e1cb SG |
3828 | lxc_list_del(it); |
3829 | free(cg->subsystem); | |
3830 | free(cg->value); | |
3831 | free(cg); | |
3832 | free(it); | |
3833 | } | |
e409b214 | 3834 | |
72d0e1cb SG |
3835 | return 0; |
3836 | } | |
3837 | ||
c6d09e15 WB |
3838 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
3839 | { | |
3840 | struct lxc_list *it, *next; | |
c6d09e15 | 3841 | const char *k = NULL; |
0fd73091 | 3842 | bool all = false; |
c6d09e15 | 3843 | |
b668653c | 3844 | if (strcmp(key, "lxc.limit") == 0 || strcmp(key, "lxc.prlimit") == 0) |
c6d09e15 | 3845 | all = true; |
6333c915 CB |
3846 | else if (strncmp(key, "lxc.limit.", STRLITERALLEN("lxc.limit.")) == 0) |
3847 | k = key + STRLITERALLEN("lxc.limit."); | |
3848 | else if (strncmp(key, "lxc.prlimit.", STRLITERALLEN("lxc.prlimit.")) == 0) | |
3849 | k = key + STRLITERALLEN("lxc.prlimit."); | |
c6d09e15 WB |
3850 | else |
3851 | return -1; | |
3852 | ||
0fd73091 | 3853 | lxc_list_for_each_safe (it, &c->limits, next) { |
c6d09e15 | 3854 | struct lxc_limit *lim = it->elem; |
0fd73091 | 3855 | |
c6d09e15 WB |
3856 | if (!all && strcmp(lim->resource, k) != 0) |
3857 | continue; | |
0fd73091 | 3858 | |
c6d09e15 WB |
3859 | lxc_list_del(it); |
3860 | free(lim->resource); | |
3861 | free(lim); | |
3862 | free(it); | |
3863 | } | |
b668653c | 3864 | |
c6d09e15 WB |
3865 | return 0; |
3866 | } | |
3867 | ||
7edd0540 L |
3868 | int lxc_clear_sysctls(struct lxc_conf *c, const char *key) |
3869 | { | |
3870 | struct lxc_list *it, *next; | |
7edd0540 | 3871 | const char *k = NULL; |
0fd73091 | 3872 | bool all = false; |
7edd0540 L |
3873 | |
3874 | if (strcmp(key, "lxc.sysctl") == 0) | |
3875 | all = true; | |
6333c915 CB |
3876 | else if (strncmp(key, "lxc.sysctl.", STRLITERALLEN("lxc.sysctl.")) == 0) |
3877 | k = key + STRLITERALLEN("lxc.sysctl."); | |
7edd0540 L |
3878 | else |
3879 | return -1; | |
3880 | ||
0fd73091 | 3881 | lxc_list_for_each_safe (it, &c->sysctls, next) { |
7edd0540 | 3882 | struct lxc_sysctl *elem = it->elem; |
0fd73091 | 3883 | |
7edd0540 L |
3884 | if (!all && strcmp(elem->key, k) != 0) |
3885 | continue; | |
0fd73091 | 3886 | |
7edd0540 L |
3887 | lxc_list_del(it); |
3888 | free(elem->key); | |
3889 | free(elem->value); | |
3890 | free(elem); | |
3891 | free(it); | |
3892 | } | |
0fd73091 | 3893 | |
7edd0540 L |
3894 | return 0; |
3895 | } | |
3896 | ||
61d7a733 YT |
3897 | int lxc_clear_procs(struct lxc_conf *c, const char *key) |
3898 | { | |
0fd73091 | 3899 | struct lxc_list *it, *next; |
61d7a733 | 3900 | const char *k = NULL; |
0fd73091 | 3901 | bool all = false; |
61d7a733 YT |
3902 | |
3903 | if (strcmp(key, "lxc.proc") == 0) | |
3904 | all = true; | |
6333c915 CB |
3905 | else if (strncmp(key, "lxc.proc.", STRLITERALLEN("lxc.proc.")) == 0) |
3906 | k = key + STRLITERALLEN("lxc.proc."); | |
61d7a733 YT |
3907 | else |
3908 | return -1; | |
3909 | ||
0fd73091 | 3910 | lxc_list_for_each_safe (it, &c->procs, next) { |
61d7a733 | 3911 | struct lxc_proc *proc = it->elem; |
0fd73091 | 3912 | |
61d7a733 YT |
3913 | if (!all && strcmp(proc->filename, k) != 0) |
3914 | continue; | |
0fd73091 | 3915 | |
61d7a733 YT |
3916 | lxc_list_del(it); |
3917 | free(proc->filename); | |
3918 | free(proc->value); | |
3919 | free(proc); | |
3920 | free(it); | |
3921 | } | |
3922 | ||
3923 | return 0; | |
3924 | } | |
3925 | ||
ee1e7aa0 SG |
3926 | int lxc_clear_groups(struct lxc_conf *c) |
3927 | { | |
0fd73091 | 3928 | struct lxc_list *it, *next; |
ee1e7aa0 | 3929 | |
0fd73091 | 3930 | lxc_list_for_each_safe (it, &c->groups, next) { |
ee1e7aa0 SG |
3931 | lxc_list_del(it); |
3932 | free(it->elem); | |
3933 | free(it); | |
3934 | } | |
0fd73091 | 3935 | |
ee1e7aa0 SG |
3936 | return 0; |
3937 | } | |
3938 | ||
ab799c0b SG |
3939 | int lxc_clear_environment(struct lxc_conf *c) |
3940 | { | |
0fd73091 | 3941 | struct lxc_list *it, *next; |
ab799c0b | 3942 | |
0fd73091 | 3943 | lxc_list_for_each_safe (it, &c->environment, next) { |
ab799c0b SG |
3944 | lxc_list_del(it); |
3945 | free(it->elem); | |
3946 | free(it); | |
3947 | } | |
0fd73091 | 3948 | |
ab799c0b SG |
3949 | return 0; |
3950 | } | |
3951 | ||
72d0e1cb SG |
3952 | int lxc_clear_mount_entries(struct lxc_conf *c) |
3953 | { | |
0fd73091 | 3954 | struct lxc_list *it, *next; |
72d0e1cb | 3955 | |
0fd73091 | 3956 | lxc_list_for_each_safe (it, &c->mount_list, next) { |
72d0e1cb SG |
3957 | lxc_list_del(it); |
3958 | free(it->elem); | |
3959 | free(it); | |
3960 | } | |
0fd73091 | 3961 | |
72d0e1cb SG |
3962 | return 0; |
3963 | } | |
3964 | ||
b099e9e9 SH |
3965 | int lxc_clear_automounts(struct lxc_conf *c) |
3966 | { | |
3967 | c->auto_mounts = 0; | |
3968 | return 0; | |
3969 | } | |
3970 | ||
12a50cc6 | 3971 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 3972 | { |
72d0e1cb | 3973 | int i; |
0fd73091 CB |
3974 | struct lxc_list *it, *next; |
3975 | const char *k = NULL; | |
3976 | bool all = false, done = false; | |
72d0e1cb | 3977 | |
17ed13a3 SH |
3978 | if (strcmp(key, "lxc.hook") == 0) |
3979 | all = true; | |
6333c915 CB |
3980 | else if (strncmp(key, "lxc.hook.", STRLITERALLEN("lxc.hook.")) == 0) |
3981 | k = key + STRLITERALLEN("lxc.hook."); | |
a6390f01 WB |
3982 | else |
3983 | return -1; | |
17ed13a3 | 3984 | |
0fd73091 | 3985 | for (i = 0; i < NUM_LXC_HOOKS; i++) { |
17ed13a3 | 3986 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
0fd73091 | 3987 | lxc_list_for_each_safe (it, &c->hooks[i], next) { |
17ed13a3 SH |
3988 | lxc_list_del(it); |
3989 | free(it->elem); | |
3990 | free(it); | |
3991 | } | |
0fd73091 | 3992 | |
17ed13a3 | 3993 | done = true; |
72d0e1cb SG |
3994 | } |
3995 | } | |
17ed13a3 SH |
3996 | |
3997 | if (!done) { | |
3998 | ERROR("Invalid hook key: %s", key); | |
3999 | return -1; | |
4000 | } | |
0fd73091 | 4001 | |
72d0e1cb SG |
4002 | return 0; |
4003 | } | |
8eb5694b | 4004 | |
4184c3e1 SH |
4005 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
4006 | { | |
0fd73091 | 4007 | struct lxc_list *it, *next; |
4184c3e1 | 4008 | |
0fd73091 | 4009 | lxc_list_for_each_safe (it, &conf->aliens, next) { |
4184c3e1 SH |
4010 | lxc_list_del(it); |
4011 | free(it->elem); | |
4012 | free(it); | |
4013 | } | |
4014 | } | |
4015 | ||
c7b15d1e | 4016 | void lxc_clear_includes(struct lxc_conf *conf) |
f979ac15 | 4017 | { |
0fd73091 | 4018 | struct lxc_list *it, *next; |
f979ac15 | 4019 | |
0fd73091 | 4020 | lxc_list_for_each_safe (it, &conf->includes, next) { |
f979ac15 SH |
4021 | lxc_list_del(it); |
4022 | free(it->elem); | |
4023 | free(it); | |
4024 | } | |
4025 | } | |
4026 | ||
1800f924 WB |
4027 | int lxc_clear_apparmor_raw(struct lxc_conf *c) |
4028 | { | |
4029 | struct lxc_list *it, *next; | |
4030 | ||
4031 | lxc_list_for_each_safe (it, &c->lsm_aa_raw, next) { | |
4032 | lxc_list_del(it); | |
4033 | free(it->elem); | |
4034 | free(it); | |
4035 | } | |
4036 | ||
4037 | return 0; | |
4038 | } | |
4039 | ||
8eb5694b SH |
4040 | void lxc_conf_free(struct lxc_conf *conf) |
4041 | { | |
4042 | if (!conf) | |
4043 | return; | |
0fd73091 | 4044 | |
858377e4 SH |
4045 | if (current_config == conf) |
4046 | current_config = NULL; | |
aed105d5 | 4047 | lxc_terminal_conf_free(&conf->console); |
f10fad2f | 4048 | free(conf->rootfs.mount); |
b3b8c97f | 4049 | free(conf->rootfs.bdev_type); |
f10fad2f ME |
4050 | free(conf->rootfs.options); |
4051 | free(conf->rootfs.path); | |
f10fad2f | 4052 | free(conf->logfile); |
858377e4 SH |
4053 | if (conf->logfd != -1) |
4054 | close(conf->logfd); | |
f10fad2f | 4055 | free(conf->utsname); |
885766f5 CB |
4056 | free(conf->ttys.dir); |
4057 | free(conf->ttys.tty_names); | |
f10fad2f ME |
4058 | free(conf->fstab); |
4059 | free(conf->rcfile); | |
5cda27c1 | 4060 | free(conf->execute_cmd); |
f10fad2f | 4061 | free(conf->init_cmd); |
3c491553 | 4062 | free(conf->init_cwd); |
6b0d5538 | 4063 | free(conf->unexpanded_config); |
76d0127f | 4064 | free(conf->syslog); |
c302b476 | 4065 | lxc_free_networks(&conf->network); |
f10fad2f | 4066 | free(conf->lsm_aa_profile); |
1800f924 | 4067 | free(conf->lsm_aa_profile_computed); |
f10fad2f | 4068 | free(conf->lsm_se_context); |
769872f9 | 4069 | lxc_seccomp_free(conf); |
8eb5694b | 4070 | lxc_clear_config_caps(conf); |
1fb86a7c | 4071 | lxc_clear_config_keepcaps(conf); |
54860ed0 CB |
4072 | lxc_clear_cgroups(conf, "lxc.cgroup", CGROUP_SUPER_MAGIC); |
4073 | lxc_clear_cgroups(conf, "lxc.cgroup2", CGROUP2_SUPER_MAGIC); | |
17ed13a3 | 4074 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 4075 | lxc_clear_mount_entries(conf); |
27c27d73 | 4076 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 4077 | lxc_clear_groups(conf); |
f979ac15 | 4078 | lxc_clear_includes(conf); |
761d81ca | 4079 | lxc_clear_aliens(conf); |
ab799c0b | 4080 | lxc_clear_environment(conf); |
240d4b74 | 4081 | lxc_clear_limits(conf, "lxc.prlimit"); |
7edd0540 | 4082 | lxc_clear_sysctls(conf, "lxc.sysctl"); |
61d7a733 | 4083 | lxc_clear_procs(conf, "lxc.proc"); |
1800f924 | 4084 | lxc_clear_apparmor_raw(conf); |
a3ed9b81 | 4085 | lxc_clear_namespace(conf); |
43654d34 CB |
4086 | free(conf->cgroup_meta.dir); |
4087 | free(conf->cgroup_meta.controllers); | |
7a41e857 LT |
4088 | free(conf->shmount.path_host); |
4089 | free(conf->shmount.path_cont); | |
8eb5694b SH |
4090 | free(conf); |
4091 | } | |
4355ab5f SH |
4092 | |
4093 | struct userns_fn_data { | |
4094 | int (*fn)(void *); | |
c9b7c33e | 4095 | const char *fn_name; |
4355ab5f SH |
4096 | void *arg; |
4097 | int p[2]; | |
4098 | }; | |
4099 | ||
4100 | static int run_userns_fn(void *data) | |
4101 | { | |
adaffdd7 | 4102 | int ret; |
4355ab5f | 4103 | char c; |
0fd73091 | 4104 | struct userns_fn_data *d = data; |
4355ab5f | 4105 | |
f8aa4bf3 | 4106 | /* Close write end of the pipe. */ |
4355ab5f | 4107 | close(d->p[1]); |
f8aa4bf3 CB |
4108 | |
4109 | /* Wait for parent to finish establishing a new mapping in the user | |
4110 | * namespace we are executing in. | |
4111 | */ | |
adaffdd7 | 4112 | ret = lxc_read_nointr(d->p[0], &c, 1); |
f8aa4bf3 | 4113 | /* Close read end of the pipe. */ |
4355ab5f | 4114 | close(d->p[0]); |
adaffdd7 CB |
4115 | if (ret != 1) |
4116 | return -1; | |
f8aa4bf3 | 4117 | |
c9b7c33e | 4118 | if (d->fn_name) |
adaffdd7 | 4119 | TRACE("Calling function \"%s\"", d->fn_name); |
0fd73091 | 4120 | |
f8aa4bf3 | 4121 | /* Call function to run. */ |
4355ab5f SH |
4122 | return d->fn(d->arg); |
4123 | } | |
4124 | ||
db7cfe23 CB |
4125 | static struct id_map *mapped_nsid_add(struct lxc_conf *conf, unsigned id, |
4126 | enum idtype idtype) | |
4127 | { | |
5173b710 CB |
4128 | const struct id_map *map; |
4129 | struct id_map *retmap; | |
db7cfe23 CB |
4130 | |
4131 | map = find_mapped_nsid_entry(conf, id, idtype); | |
4132 | if (!map) | |
4133 | return NULL; | |
4134 | ||
4135 | retmap = malloc(sizeof(*retmap)); | |
4136 | if (!retmap) | |
4137 | return NULL; | |
4138 | ||
4139 | memcpy(retmap, map, sizeof(*retmap)); | |
4140 | return retmap; | |
4141 | } | |
4142 | ||
c4333195 CB |
4143 | static struct id_map *find_mapped_hostid_entry(struct lxc_conf *conf, |
4144 | unsigned id, enum idtype idtype) | |
f8aa4bf3 | 4145 | { |
f8aa4bf3 | 4146 | struct id_map *map; |
0fd73091 | 4147 | struct lxc_list *it; |
f8aa4bf3 CB |
4148 | struct id_map *retmap = NULL; |
4149 | ||
0fd73091 | 4150 | lxc_list_for_each (it, &conf->id_map) { |
f8aa4bf3 CB |
4151 | map = it->elem; |
4152 | if (map->idtype != idtype) | |
4153 | continue; | |
4154 | ||
4155 | if (id >= map->hostid && id < map->hostid + map->range) { | |
4156 | retmap = map; | |
4157 | break; | |
4158 | } | |
4159 | } | |
4160 | ||
f8aa4bf3 CB |
4161 | return retmap; |
4162 | } | |
4163 | ||
0fd73091 | 4164 | /* Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
f8aa4bf3 | 4165 | * existing one or establish a new one. |
4355ab5f | 4166 | */ |
0fd73091 CB |
4167 | static struct id_map *mapped_hostid_add(struct lxc_conf *conf, uid_t id, |
4168 | enum idtype type) | |
4355ab5f | 4169 | { |
28a2d9e7 | 4170 | int hostid_mapped; |
c4333195 CB |
4171 | struct id_map *entry = NULL, *tmp = NULL; |
4172 | ||
4173 | entry = malloc(sizeof(*entry)); | |
4174 | if (!entry) | |
4175 | return NULL; | |
f8aa4bf3 | 4176 | |
28a2d9e7 | 4177 | /* Reuse existing mapping. */ |
c4333195 CB |
4178 | tmp = find_mapped_hostid_entry(conf, id, type); |
4179 | if (tmp) | |
4180 | return memcpy(entry, tmp, sizeof(*entry)); | |
f8aa4bf3 | 4181 | |
28a2d9e7 CB |
4182 | /* Find new mapping. */ |
4183 | hostid_mapped = find_unmapped_nsid(conf, type); | |
4184 | if (hostid_mapped < 0) { | |
c4333195 CB |
4185 | DEBUG("Failed to find free mapping for id %d", id); |
4186 | free(entry); | |
28a2d9e7 | 4187 | return NULL; |
f8aa4bf3 | 4188 | } |
f8aa4bf3 | 4189 | |
28a2d9e7 CB |
4190 | entry->idtype = type; |
4191 | entry->nsid = hostid_mapped; | |
4192 | entry->hostid = (unsigned long)id; | |
4193 | entry->range = 1; | |
4355ab5f | 4194 | |
28a2d9e7 | 4195 | return entry; |
4355ab5f SH |
4196 | } |
4197 | ||
dcf0ffdf | 4198 | struct lxc_list *get_minimal_idmap(struct lxc_conf *conf) |
4355ab5f | 4199 | { |
00d6cfe2 CB |
4200 | __do_free struct id_map *container_root_uid = NULL, |
4201 | *container_root_gid = NULL, | |
4202 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4203 | __do_free struct lxc_list *idmap = NULL; | |
f8aa4bf3 | 4204 | uid_t euid, egid; |
4160c3a0 CB |
4205 | uid_t nsuid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; |
4206 | gid_t nsgid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
00d6cfe2 | 4207 | struct lxc_list *tmplist = NULL; |
4355ab5f | 4208 | |
db7cfe23 | 4209 | /* Find container root mappings. */ |
4160c3a0 | 4210 | container_root_uid = mapped_nsid_add(conf, nsuid, ID_TYPE_UID); |
db7cfe23 | 4211 | if (!container_root_uid) { |
dcf0ffdf | 4212 | DEBUG("Failed to find mapping for namespace uid %d", 0); |
00d6cfe2 | 4213 | return NULL; |
f8aa4bf3 | 4214 | } |
dcf0ffdf CB |
4215 | euid = geteuid(); |
4216 | if (euid >= container_root_uid->hostid && | |
4217 | euid < (container_root_uid->hostid + container_root_uid->range)) | |
db7cfe23 | 4218 | host_uid_map = container_root_uid; |
f8aa4bf3 | 4219 | |
4160c3a0 | 4220 | container_root_gid = mapped_nsid_add(conf, nsgid, ID_TYPE_GID); |
db7cfe23 | 4221 | if (!container_root_gid) { |
dcf0ffdf | 4222 | DEBUG("Failed to find mapping for namespace gid %d", 0); |
00d6cfe2 | 4223 | return NULL; |
f8aa4bf3 | 4224 | } |
dcf0ffdf CB |
4225 | egid = getegid(); |
4226 | if (egid >= container_root_gid->hostid && | |
4227 | egid < (container_root_gid->hostid + container_root_gid->range)) | |
db7cfe23 | 4228 | host_gid_map = container_root_gid; |
f8aa4bf3 CB |
4229 | |
4230 | /* Check whether the {g,u}id of the user has a mapping. */ | |
954b7d9b | 4231 | if (!host_uid_map) |
c4333195 | 4232 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
28a2d9e7 | 4233 | if (!host_uid_map) { |
db7cfe23 | 4234 | DEBUG("Failed to find mapping for uid %d", euid); |
00d6cfe2 | 4235 | return NULL; |
f8aa4bf3 CB |
4236 | } |
4237 | ||
dcf0ffdf CB |
4238 | if (!host_gid_map) |
4239 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); | |
28a2d9e7 | 4240 | if (!host_gid_map) { |
db7cfe23 | 4241 | DEBUG("Failed to find mapping for gid %d", egid); |
00d6cfe2 | 4242 | return NULL; |
28a2d9e7 CB |
4243 | } |
4244 | ||
4245 | /* Allocate new {g,u}id map list. */ | |
4246 | idmap = malloc(sizeof(*idmap)); | |
4247 | if (!idmap) | |
00d6cfe2 | 4248 | return NULL; |
28a2d9e7 CB |
4249 | lxc_list_init(idmap); |
4250 | ||
f8aa4bf3 CB |
4251 | /* Add container root to the map. */ |
4252 | tmplist = malloc(sizeof(*tmplist)); | |
4253 | if (!tmplist) | |
00d6cfe2 | 4254 | return NULL; |
f8aa4bf3 CB |
4255 | lxc_list_add_elem(tmplist, container_root_uid); |
4256 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4257 | |
1d90e064 | 4258 | if (host_uid_map && (host_uid_map != container_root_uid)) { |
28a2d9e7 | 4259 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4260 | move_ptr(container_root_uid); |
28a2d9e7 CB |
4261 | |
4262 | /* Add container root to the map. */ | |
4263 | tmplist = malloc(sizeof(*tmplist)); | |
4264 | if (!tmplist) | |
00d6cfe2 | 4265 | return NULL; |
28a2d9e7 CB |
4266 | lxc_list_add_elem(tmplist, host_uid_map); |
4267 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4268 | } |
1d90e064 | 4269 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4270 | move_ptr(container_root_uid); |
1d90e064 | 4271 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4272 | move_ptr(host_uid_map); |
f8aa4bf3 CB |
4273 | |
4274 | tmplist = malloc(sizeof(*tmplist)); | |
4275 | if (!tmplist) | |
00d6cfe2 | 4276 | return NULL; |
f8aa4bf3 CB |
4277 | lxc_list_add_elem(tmplist, container_root_gid); |
4278 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4279 | |
1d90e064 | 4280 | if (host_gid_map && (host_gid_map != container_root_gid)) { |
28a2d9e7 | 4281 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4282 | move_ptr(container_root_gid); |
28a2d9e7 CB |
4283 | |
4284 | tmplist = malloc(sizeof(*tmplist)); | |
4285 | if (!tmplist) | |
00d6cfe2 | 4286 | return NULL; |
28a2d9e7 CB |
4287 | lxc_list_add_elem(tmplist, host_gid_map); |
4288 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4289 | } |
1d90e064 | 4290 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4291 | move_ptr(container_root_gid); |
1d90e064 | 4292 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4293 | move_ptr(host_gid_map); |
f8aa4bf3 | 4294 | |
dcf0ffdf | 4295 | TRACE("Allocated minimal idmapping"); |
00d6cfe2 | 4296 | return move_ptr(idmap); |
dcf0ffdf CB |
4297 | } |
4298 | ||
4299 | /* Run a function in a new user namespace. | |
4300 | * The caller's euid/egid will be mapped if it is not already. | |
4301 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
4302 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
4303 | * This means we require only to establish a mapping from: | |
4304 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
4305 | * - the container root -> some sub{g,u}id | |
915e3dbd | 4306 | * The former we add, if the user did not specify a mapping. The latter we |
6f3fd27f | 4307 | * retrieve from the container's configured {g,u}id mappings as it must have been |
dcf0ffdf CB |
4308 | * there to start the container in the first place. |
4309 | */ | |
4310 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data, | |
4311 | const char *fn_name) | |
4312 | { | |
4313 | pid_t pid; | |
dcf0ffdf | 4314 | int p[2]; |
0fd73091 | 4315 | struct userns_fn_data d; |
dcf0ffdf | 4316 | struct lxc_list *idmap; |
0fd73091 CB |
4317 | int ret = -1, status = -1; |
4318 | char c = '1'; | |
dcf0ffdf | 4319 | |
2b2655a8 CB |
4320 | if (!conf) |
4321 | return -EINVAL; | |
4322 | ||
dcf0ffdf CB |
4323 | idmap = get_minimal_idmap(conf); |
4324 | if (!idmap) | |
4325 | return -1; | |
4326 | ||
979f9e34 | 4327 | ret = pipe2(p, O_CLOEXEC); |
dcf0ffdf CB |
4328 | if (ret < 0) { |
4329 | SYSERROR("Failed to create pipe"); | |
4330 | return -1; | |
4331 | } | |
4332 | d.fn = fn; | |
4333 | d.fn_name = fn_name; | |
4334 | d.arg = data; | |
4335 | d.p[0] = p[0]; | |
4336 | d.p[1] = p[1]; | |
4337 | ||
4338 | /* Clone child in new user namespace. */ | |
4339 | pid = lxc_raw_clone_cb(run_userns_fn, &d, CLONE_NEWUSER); | |
4340 | if (pid < 0) { | |
0fd73091 | 4341 | ERROR("Failed to clone process in new user namespace"); |
dcf0ffdf CB |
4342 | goto on_error; |
4343 | } | |
4344 | ||
4345 | close(p[0]); | |
4346 | p[0] = -1; | |
4347 | ||
4b73005c CB |
4348 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || |
4349 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
dcf0ffdf | 4350 | struct id_map *map; |
0fd73091 | 4351 | struct lxc_list *it; |
dcf0ffdf | 4352 | |
0fd73091 | 4353 | lxc_list_for_each (it, idmap) { |
f8aa4bf3 | 4354 | map = it->elem; |
dcf0ffdf | 4355 | TRACE("Establishing %cid mapping for \"%d\" in new " |
f8aa4bf3 | 4356 | "user namespace: nsuid %lu - hostid %lu - range " |
0fd73091 CB |
4357 | "%lu", |
4358 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4359 | map->nsid, map->hostid, map->range); | |
f8aa4bf3 | 4360 | } |
4355ab5f SH |
4361 | } |
4362 | ||
f8aa4bf3 | 4363 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 4364 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 | 4365 | if (ret < 0) { |
0fd73091 | 4366 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); |
f8aa4bf3 | 4367 | goto on_error; |
4355ab5f SH |
4368 | } |
4369 | ||
f8aa4bf3 | 4370 | /* Tell child to proceed. */ |
489f39be | 4371 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
dcf0ffdf | 4372 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
f8aa4bf3 | 4373 | goto on_error; |
4355ab5f SH |
4374 | } |
4375 | ||
686dd5d1 | 4376 | on_error: |
4355ab5f SH |
4377 | if (p[0] != -1) |
4378 | close(p[0]); | |
4379 | close(p[1]); | |
f8aa4bf3 | 4380 | |
ee1b16bc TA |
4381 | /* Wait for child to finish. */ |
4382 | if (pid > 0) | |
4383 | status = wait_for_pid(pid); | |
4384 | ||
686dd5d1 CB |
4385 | if (status < 0) |
4386 | ret = -1; | |
4387 | ||
f8aa4bf3 | 4388 | return ret; |
4355ab5f | 4389 | } |
97e9cfa0 | 4390 | |
415a8851 CB |
4391 | int userns_exec_full(struct lxc_conf *conf, int (*fn)(void *), void *data, |
4392 | const char *fn_name) | |
4393 | { | |
4394 | pid_t pid; | |
4395 | uid_t euid, egid; | |
415a8851 CB |
4396 | int p[2]; |
4397 | struct id_map *map; | |
4398 | struct lxc_list *cur; | |
0fd73091 | 4399 | struct userns_fn_data d; |
415a8851 | 4400 | int ret = -1; |
0fd73091 | 4401 | char c = '1'; |
415a8851 CB |
4402 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
4403 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, | |
4404 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4405 | ||
2b2655a8 CB |
4406 | if (!conf) |
4407 | return -EINVAL; | |
4408 | ||
979f9e34 | 4409 | ret = pipe2(p, O_CLOEXEC); |
415a8851 CB |
4410 | if (ret < 0) { |
4411 | SYSERROR("opening pipe"); | |
4412 | return -1; | |
4413 | } | |
4414 | d.fn = fn; | |
4415 | d.fn_name = fn_name; | |
4416 | d.arg = data; | |
4417 | d.p[0] = p[0]; | |
4418 | d.p[1] = p[1]; | |
4419 | ||
4420 | /* Clone child in new user namespace. */ | |
4421 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER); | |
4422 | if (pid < 0) { | |
0fd73091 | 4423 | ERROR("Failed to clone process in new user namespace"); |
415a8851 CB |
4424 | goto on_error; |
4425 | } | |
4426 | ||
4427 | close(p[0]); | |
4428 | p[0] = -1; | |
4429 | ||
4430 | euid = geteuid(); | |
4431 | egid = getegid(); | |
4432 | ||
4433 | /* Allocate new {g,u}id map list. */ | |
4434 | idmap = malloc(sizeof(*idmap)); | |
4435 | if (!idmap) | |
4436 | goto on_error; | |
4437 | lxc_list_init(idmap); | |
4438 | ||
4439 | /* Find container root. */ | |
0fd73091 | 4440 | lxc_list_for_each (cur, &conf->id_map) { |
415a8851 CB |
4441 | struct id_map *tmpmap; |
4442 | ||
4443 | tmplist = malloc(sizeof(*tmplist)); | |
4444 | if (!tmplist) | |
4445 | goto on_error; | |
4446 | ||
4447 | tmpmap = malloc(sizeof(*tmpmap)); | |
4448 | if (!tmpmap) { | |
4449 | free(tmplist); | |
4450 | goto on_error; | |
4451 | } | |
4452 | ||
4453 | memset(tmpmap, 0, sizeof(*tmpmap)); | |
4454 | memcpy(tmpmap, cur->elem, sizeof(*tmpmap)); | |
4455 | tmplist->elem = tmpmap; | |
4456 | ||
4457 | lxc_list_add_tail(idmap, tmplist); | |
4458 | ||
4459 | map = cur->elem; | |
4460 | ||
4461 | if (map->idtype == ID_TYPE_UID) | |
4462 | if (euid >= map->hostid && euid < map->hostid + map->range) | |
4463 | host_uid_map = map; | |
4464 | ||
4465 | if (map->idtype == ID_TYPE_GID) | |
4466 | if (egid >= map->hostid && egid < map->hostid + map->range) | |
4467 | host_gid_map = map; | |
4468 | ||
4469 | if (map->nsid != 0) | |
4470 | continue; | |
4471 | ||
4472 | if (map->idtype == ID_TYPE_UID) | |
4473 | if (container_root_uid == NULL) | |
4474 | container_root_uid = map; | |
4475 | ||
4476 | if (map->idtype == ID_TYPE_GID) | |
4477 | if (container_root_gid == NULL) | |
4478 | container_root_gid = map; | |
4479 | } | |
4480 | ||
4481 | if (!container_root_uid || !container_root_gid) { | |
4482 | ERROR("No mapping for container root found"); | |
4483 | goto on_error; | |
4484 | } | |
4485 | ||
4486 | /* Check whether the {g,u}id of the user has a mapping. */ | |
4487 | if (!host_uid_map) | |
c4333195 | 4488 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
415a8851 CB |
4489 | else |
4490 | host_uid_map = container_root_uid; | |
4491 | ||
4492 | if (!host_gid_map) | |
c4333195 | 4493 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); |
415a8851 CB |
4494 | else |
4495 | host_gid_map = container_root_gid; | |
4496 | ||
4497 | if (!host_uid_map) { | |
4498 | DEBUG("Failed to find mapping for uid %d", euid); | |
4499 | goto on_error; | |
4500 | } | |
4501 | ||
4502 | if (!host_gid_map) { | |
4503 | DEBUG("Failed to find mapping for gid %d", egid); | |
4504 | goto on_error; | |
4505 | } | |
4506 | ||
4507 | if (host_uid_map && (host_uid_map != container_root_uid)) { | |
4508 | /* Add container root to the map. */ | |
4509 | tmplist = malloc(sizeof(*tmplist)); | |
4510 | if (!tmplist) | |
4511 | goto on_error; | |
4512 | lxc_list_add_elem(tmplist, host_uid_map); | |
4513 | lxc_list_add_tail(idmap, tmplist); | |
4514 | } | |
4515 | /* idmap will now keep track of that memory. */ | |
4516 | host_uid_map = NULL; | |
4517 | ||
4518 | if (host_gid_map && (host_gid_map != container_root_gid)) { | |
4519 | tmplist = malloc(sizeof(*tmplist)); | |
4520 | if (!tmplist) | |
4521 | goto on_error; | |
4522 | lxc_list_add_elem(tmplist, host_gid_map); | |
4523 | lxc_list_add_tail(idmap, tmplist); | |
4524 | } | |
4525 | /* idmap will now keep track of that memory. */ | |
4526 | host_gid_map = NULL; | |
4527 | ||
4528 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || | |
4529 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
0fd73091 | 4530 | lxc_list_for_each (cur, idmap) { |
415a8851 CB |
4531 | map = cur->elem; |
4532 | TRACE("establishing %cid mapping for \"%d\" in new " | |
4533 | "user namespace: nsuid %lu - hostid %lu - range " | |
4534 | "%lu", | |
4535 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4536 | map->nsid, map->hostid, map->range); | |
4537 | } | |
4538 | } | |
4539 | ||
4540 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
4541 | ret = lxc_map_ids(idmap, pid); | |
4542 | if (ret < 0) { | |
0fd73091 | 4543 | ERROR("error setting up {g,u}id mappings for child process \"%d\"", pid); |
415a8851 CB |
4544 | goto on_error; |
4545 | } | |
4546 | ||
4547 | /* Tell child to proceed. */ | |
489f39be | 4548 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
0fd73091 | 4549 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
415a8851 CB |
4550 | goto on_error; |
4551 | } | |
4552 | ||
686dd5d1 | 4553 | on_error: |
ee1b16bc TA |
4554 | if (p[0] != -1) |
4555 | close(p[0]); | |
4556 | close(p[1]); | |
4557 | ||
415a8851 | 4558 | /* Wait for child to finish. */ |
686dd5d1 CB |
4559 | if (pid > 0) |
4560 | ret = wait_for_pid(pid); | |
415a8851 | 4561 | |
80758b4b | 4562 | if (idmap) { |
415a8851 | 4563 | lxc_free_idmap(idmap); |
80758b4b DJ |
4564 | free(idmap); |
4565 | } | |
4566 | ||
415a8851 CB |
4567 | if (host_uid_map && (host_uid_map != container_root_uid)) |
4568 | free(host_uid_map); | |
4569 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4570 | free(host_gid_map); | |
4571 | ||
415a8851 CB |
4572 | return ret; |
4573 | } | |
4574 | ||
a96a8e8c | 4575 | /* not thread-safe, do not use from api without first forking */ |
0fd73091 | 4576 | static char *getuname(void) |
97e9cfa0 | 4577 | { |
4f410b2a | 4578 | __do_free char *buf = NULL; |
cb7aa5e8 DJ |
4579 | struct passwd pwent; |
4580 | struct passwd *pwentp = NULL; | |
cb7aa5e8 DJ |
4581 | size_t bufsize; |
4582 | int ret; | |
97e9cfa0 | 4583 | |
cb7aa5e8 DJ |
4584 | bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); |
4585 | if (bufsize == -1) | |
4586 | bufsize = 1024; | |
4587 | ||
4588 | buf = malloc(bufsize); | |
4589 | if (!buf) | |
97e9cfa0 SH |
4590 | return NULL; |
4591 | ||
cb7aa5e8 DJ |
4592 | ret = getpwuid_r(geteuid(), &pwent, buf, bufsize, &pwentp); |
4593 | if (!pwentp) { | |
4594 | if (ret == 0) | |
4595 | WARN("Could not find matched password record."); | |
4596 | ||
4597 | ERROR("Failed to get password record - %u", geteuid()); | |
cb7aa5e8 DJ |
4598 | return NULL; |
4599 | } | |
4600 | ||
4f410b2a | 4601 | return strdup(pwent.pw_name); |
97e9cfa0 SH |
4602 | } |
4603 | ||
a96a8e8c | 4604 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4605 | static char *getgname(void) |
4606 | { | |
4f410b2a | 4607 | __do_free char *buf = NULL; |
3de9fb4c DJ |
4608 | struct group grent; |
4609 | struct group *grentp = NULL; | |
3de9fb4c DJ |
4610 | size_t bufsize; |
4611 | int ret; | |
4612 | ||
4613 | bufsize = sysconf(_SC_GETGR_R_SIZE_MAX); | |
4614 | if (bufsize == -1) | |
4615 | bufsize = 1024; | |
4616 | ||
4617 | buf = malloc(bufsize); | |
4618 | if (!buf) | |
4619 | return NULL; | |
4620 | ||
4621 | ret = getgrgid_r(getegid(), &grent, buf, bufsize, &grentp); | |
4622 | if (!grentp) { | |
4623 | if (ret == 0) | |
4624 | WARN("Could not find matched group record"); | |
97e9cfa0 | 4625 | |
3de9fb4c | 4626 | ERROR("Failed to get group record - %u", getegid()); |
97e9cfa0 | 4627 | return NULL; |
3de9fb4c DJ |
4628 | } |
4629 | ||
4f410b2a | 4630 | return strdup(grent.gr_name); |
97e9cfa0 SH |
4631 | } |
4632 | ||
a96a8e8c | 4633 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4634 | void suggest_default_idmap(void) |
4635 | { | |
3a6e3bf5 | 4636 | __do_free char *gname = NULL, *line = NULL, *uname = NULL; |
4aae564f | 4637 | __do_fclose FILE *subuid_f = NULL, *subgid_f = NULL; |
97e9cfa0 | 4638 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; |
97e9cfa0 SH |
4639 | size_t len = 0; |
4640 | ||
0fd73091 CB |
4641 | uname = getuname(); |
4642 | if (!uname) | |
97e9cfa0 SH |
4643 | return; |
4644 | ||
0fd73091 | 4645 | gname = getgname(); |
3a6e3bf5 | 4646 | if (!gname) |
97e9cfa0 | 4647 | return; |
97e9cfa0 | 4648 | |
4aae564f CB |
4649 | subuid_f = fopen(subuidfile, "r"); |
4650 | if (!subuid_f) { | |
97e9cfa0 | 4651 | ERROR("Your system is not configured with subuids"); |
97e9cfa0 SH |
4652 | return; |
4653 | } | |
0fd73091 | 4654 | |
4aae564f | 4655 | while (getline(&line, &len, subuid_f) != -1) { |
0fd73091 | 4656 | char *p, *p2; |
b7930180 | 4657 | size_t no_newline = 0; |
0fd73091 CB |
4658 | |
4659 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4660 | if (*line == '#') |
4661 | continue; | |
4662 | if (!p) | |
4663 | continue; | |
4664 | *p = '\0'; | |
4665 | p++; | |
0fd73091 | 4666 | |
97e9cfa0 SH |
4667 | if (strcmp(line, uname)) |
4668 | continue; | |
0fd73091 | 4669 | |
97e9cfa0 SH |
4670 | p2 = strchr(p, ':'); |
4671 | if (!p2) | |
4672 | continue; | |
4673 | *p2 = '\0'; | |
4674 | p2++; | |
4675 | if (!*p2) | |
4676 | continue; | |
b7930180 CB |
4677 | no_newline = strcspn(p2, "\n"); |
4678 | p2[no_newline] = '\0'; | |
4679 | ||
b7b2fde4 | 4680 | if (lxc_safe_uint(p, &uid) < 0) |
0fd73091 | 4681 | WARN("Could not parse UID"); |
b7b2fde4 | 4682 | if (lxc_safe_uint(p2, &urange) < 0) |
0fd73091 | 4683 | WARN("Could not parse UID range"); |
97e9cfa0 | 4684 | } |
97e9cfa0 | 4685 | |
4aae564f CB |
4686 | subgid_f = fopen(subgidfile, "r"); |
4687 | if (!subgid_f) { | |
97e9cfa0 | 4688 | ERROR("Your system is not configured with subgids"); |
97e9cfa0 SH |
4689 | return; |
4690 | } | |
0fd73091 | 4691 | |
4aae564f | 4692 | while (getline(&line, &len, subgid_f) != -1) { |
0fd73091 | 4693 | char *p, *p2; |
b7930180 | 4694 | size_t no_newline = 0; |
0fd73091 CB |
4695 | |
4696 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4697 | if (*line == '#') |
4698 | continue; | |
4699 | if (!p) | |
4700 | continue; | |
4701 | *p = '\0'; | |
4702 | p++; | |
0fd73091 | 4703 | |
97e9cfa0 SH |
4704 | if (strcmp(line, uname)) |
4705 | continue; | |
0fd73091 | 4706 | |
97e9cfa0 SH |
4707 | p2 = strchr(p, ':'); |
4708 | if (!p2) | |
4709 | continue; | |
4710 | *p2 = '\0'; | |
4711 | p2++; | |
4712 | if (!*p2) | |
4713 | continue; | |
b7930180 CB |
4714 | no_newline = strcspn(p2, "\n"); |
4715 | p2[no_newline] = '\0'; | |
4716 | ||
b7b2fde4 | 4717 | if (lxc_safe_uint(p, &gid) < 0) |
0fd73091 | 4718 | WARN("Could not parse GID"); |
b7b2fde4 | 4719 | if (lxc_safe_uint(p2, &grange) < 0) |
0fd73091 | 4720 | WARN("Could not parse GID range"); |
97e9cfa0 | 4721 | } |
97e9cfa0 | 4722 | |
97e9cfa0 SH |
4723 | if (!urange || !grange) { |
4724 | ERROR("You do not have subuids or subgids allocated"); | |
4725 | ERROR("Unprivileged containers require subuids and subgids"); | |
4726 | return; | |
4727 | } | |
4728 | ||
4729 | ERROR("You must either run as root, or define uid mappings"); | |
4730 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4731 | ERROR("~/.config/lxc/default.conf:"); | |
4732 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
bdcbb6b3 CB |
4733 | ERROR("lxc.idmap = u 0 %u %u", uid, urange); |
4734 | ERROR("lxc.idmap = g 0 %u %u", gid, grange); | |
97e9cfa0 | 4735 | } |
aaf26830 | 4736 | |
a7307747 SH |
4737 | static void free_cgroup_settings(struct lxc_list *result) |
4738 | { | |
4739 | struct lxc_list *iterator, *next; | |
4740 | ||
0fd73091 | 4741 | lxc_list_for_each_safe (iterator, result, next) { |
a7307747 SH |
4742 | lxc_list_del(iterator); |
4743 | free(iterator); | |
4744 | } | |
4745 | free(result); | |
4746 | } | |
4747 | ||
0fd73091 | 4748 | /* Return the list of cgroup_settings sorted according to the following rules |
aaf26830 KT |
4749 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes |
4750 | */ | |
0fd73091 | 4751 | struct lxc_list *sort_cgroup_settings(struct lxc_list *cgroup_settings) |
aaf26830 KT |
4752 | { |
4753 | struct lxc_list *result; | |
aaf26830 | 4754 | struct lxc_cgroup *cg = NULL; |
0fd73091 | 4755 | struct lxc_list *it = NULL, *item = NULL, *memsw_limit = NULL; |
aaf26830 KT |
4756 | |
4757 | result = malloc(sizeof(*result)); | |
0fd73091 | 4758 | if (!result) |
fac7c663 | 4759 | return NULL; |
aaf26830 KT |
4760 | lxc_list_init(result); |
4761 | ||
0fd73091 CB |
4762 | /* Iterate over the cgroup settings and copy them to the output list. */ |
4763 | lxc_list_for_each (it, cgroup_settings) { | |
aaf26830 | 4764 | item = malloc(sizeof(*item)); |
fac7c663 | 4765 | if (!item) { |
a7307747 | 4766 | free_cgroup_settings(result); |
fac7c663 KT |
4767 | return NULL; |
4768 | } | |
0fd73091 | 4769 | |
aaf26830 KT |
4770 | item->elem = it->elem; |
4771 | cg = it->elem; | |
4772 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
4773 | /* Store the memsw_limit location */ | |
4774 | memsw_limit = item; | |
0fd73091 CB |
4775 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && |
4776 | memsw_limit != NULL) { | |
4777 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found | |
4778 | * before lxc.cgroup.memory.limit_in_bytes, swap these | |
4779 | * two items */ | |
aaf26830 KT |
4780 | item->elem = memsw_limit->elem; |
4781 | memsw_limit->elem = it->elem; | |
4782 | } | |
4783 | lxc_list_add_tail(result, item); | |
4784 | } | |
4785 | ||
4786 | return result; | |
a7307747 | 4787 | } |