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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; |
8e7da691 | 310 | int 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 | ||
062b72c6 | 326 | while (fgets(output, LXC_LOG_BUFFER_SIZE, f->f)) |
3f60c2f7 | 327 | DEBUG("Script %s with output: %s", buffer, output); |
91c3830e | 328 | |
ebec9176 | 329 | ret = lxc_pclose(f); |
8e7da691 | 330 | if (ret == -1) { |
3f60c2f7 | 331 | SYSERROR("Script exited with error"); |
91c3830e | 332 | return -1; |
8e7da691 | 333 | } else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) { |
3f60c2f7 | 334 | ERROR("Script exited with status %d", WEXITSTATUS(ret)); |
8e7da691 DE |
335 | return -1; |
336 | } else if (WIFSIGNALED(ret)) { | |
3f60c2f7 | 337 | ERROR("Script terminated by signal %d", WTERMSIG(ret)); |
8e7da691 | 338 | return -1; |
91c3830e SH |
339 | } |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
14a7b0f9 CB |
344 | int run_script_argv(const char *name, unsigned int hook_version, |
345 | const char *section, const char *script, | |
586b1ce7 | 346 | const char *hookname, char **argv) |
148e91f5 | 347 | { |
e1a94937 | 348 | __do_free char *buffer = NULL; |
3f60c2f7 | 349 | int buf_pos, i, ret; |
d08e5708 | 350 | size_t size = 0; |
148e91f5 | 351 | |
3f60c2f7 CB |
352 | if (hook_version == 0) |
353 | INFO("Executing script \"%s\" for container \"%s\", config " | |
354 | "section \"%s\"", script, name, section); | |
355 | else | |
356 | INFO("Executing script \"%s\" for container \"%s\"", script, name); | |
148e91f5 | 357 | |
586b1ce7 CB |
358 | for (i = 0; argv && argv[i]; i++) |
359 | size += strlen(argv[i]) + 1; | |
148e91f5 | 360 | |
6333c915 CB |
361 | size += STRLITERALLEN("exec"); |
362 | size++; | |
148e91f5 | 363 | size += strlen(script); |
3f60c2f7 CB |
364 | size++; |
365 | ||
148e91f5 | 366 | if (size > INT_MAX) |
3f60c2f7 | 367 | return -EFBIG; |
148e91f5 | 368 | |
3f60c2f7 | 369 | if (hook_version == 0) { |
d08e5708 CB |
370 | size += strlen(hookname); |
371 | size++; | |
372 | ||
373 | size += strlen(name); | |
374 | size++; | |
375 | ||
376 | size += strlen(section); | |
377 | size++; | |
378 | ||
379 | if (size > INT_MAX) | |
380 | return -EFBIG; | |
327cce76 | 381 | } |
3f60c2f7 | 382 | |
6f8d00d2 CB |
383 | buffer = malloc(size); |
384 | if (!buffer) | |
385 | return -ENOMEM; | |
386 | ||
327cce76 | 387 | if (hook_version == 0) |
3f60c2f7 | 388 | buf_pos = snprintf(buffer, size, "exec %s %s %s %s", script, name, section, hookname); |
327cce76 | 389 | else |
3f60c2f7 | 390 | buf_pos = snprintf(buffer, size, "exec %s", script); |
327cce76 CB |
391 | if (buf_pos < 0 || (size_t)buf_pos >= size) { |
392 | ERROR("Failed to create command line for script \"%s\"", script); | |
e1a94937 | 393 | return -1; |
327cce76 | 394 | } |
3f60c2f7 | 395 | |
327cce76 | 396 | if (hook_version == 1) { |
3f60c2f7 CB |
397 | ret = setenv("LXC_HOOK_TYPE", hookname, 1); |
398 | if (ret < 0) { | |
399 | SYSERROR("Failed to set environment variable: " | |
400 | "LXC_HOOK_TYPE=%s", hookname); | |
e1a94937 | 401 | return -1; |
3f60c2f7 | 402 | } |
90f20466 | 403 | TRACE("Set environment variable: LXC_HOOK_TYPE=%s", hookname); |
3f60c2f7 CB |
404 | |
405 | ret = setenv("LXC_HOOK_SECTION", section, 1); | |
406 | if (ret < 0) { | |
407 | SYSERROR("Failed to set environment variable: " | |
408 | "LXC_HOOK_SECTION=%s", section); | |
e1a94937 | 409 | return -1; |
3f60c2f7 CB |
410 | } |
411 | TRACE("Set environment variable: LXC_HOOK_SECTION=%s", section); | |
14a7b0f9 CB |
412 | |
413 | if (strcmp(section, "net") == 0) { | |
414 | char *parent; | |
415 | ||
586b1ce7 | 416 | if (!argv || !argv[0]) |
e1a94937 | 417 | return -1; |
14a7b0f9 | 418 | |
586b1ce7 | 419 | ret = setenv("LXC_NET_TYPE", argv[0], 1); |
14a7b0f9 CB |
420 | if (ret < 0) { |
421 | SYSERROR("Failed to set environment variable: " | |
586b1ce7 | 422 | "LXC_NET_TYPE=%s", argv[0]); |
e1a94937 | 423 | return -1; |
14a7b0f9 | 424 | } |
586b1ce7 | 425 | TRACE("Set environment variable: LXC_NET_TYPE=%s", argv[0]); |
14a7b0f9 | 426 | |
586b1ce7 | 427 | parent = argv[1] ? argv[1] : ""; |
14a7b0f9 | 428 | |
a8144263 | 429 | if (strcmp(argv[0], "macvlan") == 0) { |
14a7b0f9 CB |
430 | ret = setenv("LXC_NET_PARENT", parent, 1); |
431 | if (ret < 0) { | |
432 | SYSERROR("Failed to set environment " | |
433 | "variable: LXC_NET_PARENT=%s", parent); | |
e1a94937 | 434 | return -1; |
14a7b0f9 CB |
435 | } |
436 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
a8144263 | 437 | } else if (strcmp(argv[0], "phys") == 0) { |
14a7b0f9 CB |
438 | ret = setenv("LXC_NET_PARENT", parent, 1); |
439 | if (ret < 0) { | |
440 | SYSERROR("Failed to set environment " | |
441 | "variable: LXC_NET_PARENT=%s", parent); | |
e1a94937 | 442 | return -1; |
14a7b0f9 CB |
443 | } |
444 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
a8144263 | 445 | } else if (strcmp(argv[0], "veth") == 0) { |
586b1ce7 | 446 | char *peer = argv[2] ? argv[2] : ""; |
14a7b0f9 CB |
447 | |
448 | ret = setenv("LXC_NET_PEER", peer, 1); | |
449 | if (ret < 0) { | |
450 | SYSERROR("Failed to set environment " | |
451 | "variable: LXC_NET_PEER=%s", peer); | |
e1a94937 | 452 | return -1; |
14a7b0f9 CB |
453 | } |
454 | TRACE("Set environment variable: LXC_NET_PEER=%s", peer); | |
455 | ||
456 | ret = setenv("LXC_NET_PARENT", parent, 1); | |
457 | if (ret < 0) { | |
458 | SYSERROR("Failed to set environment " | |
459 | "variable: LXC_NET_PARENT=%s", parent); | |
e1a94937 | 460 | return -1; |
14a7b0f9 CB |
461 | } |
462 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
463 | } | |
464 | } | |
148e91f5 SH |
465 | } |
466 | ||
586b1ce7 | 467 | for (i = 0; argv && argv[i]; i++) { |
3f60c2f7 CB |
468 | size_t len = size - buf_pos; |
469 | ||
586b1ce7 | 470 | ret = snprintf(buffer + buf_pos, len, " %s", argv[i]); |
3f60c2f7 CB |
471 | if (ret < 0 || (size_t)ret >= len) { |
472 | ERROR("Failed to create command line for script \"%s\"", script); | |
e1a94937 | 473 | return -1; |
148e91f5 | 474 | } |
3f60c2f7 | 475 | buf_pos += ret; |
148e91f5 SH |
476 | } |
477 | ||
e1a94937 | 478 | return run_buffer(buffer); |
148e91f5 SH |
479 | } |
480 | ||
811ef482 | 481 | int run_script(const char *name, const char *section, const char *script, ...) |
e3b4c4c4 | 482 | { |
2f443e88 | 483 | __do_free char *buffer = NULL; |
abbfd20b | 484 | int ret; |
2f443e88 | 485 | char *p; |
abbfd20b | 486 | va_list ap; |
0fd73091 | 487 | size_t size = 0; |
751d9dcd | 488 | |
0fd73091 | 489 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\"", |
751d9dcd | 490 | script, name, section); |
e3b4c4c4 | 491 | |
abbfd20b DL |
492 | va_start(ap, script); |
493 | while ((p = va_arg(ap, char *))) | |
95642a10 | 494 | size += strlen(p) + 1; |
abbfd20b DL |
495 | va_end(ap); |
496 | ||
6333c915 | 497 | size += STRLITERALLEN("exec"); |
abbfd20b DL |
498 | size += strlen(script); |
499 | size += strlen(name); | |
500 | size += strlen(section); | |
6d1a5f93 | 501 | size += 4; |
abbfd20b | 502 | |
95642a10 MS |
503 | if (size > INT_MAX) |
504 | return -1; | |
505 | ||
2f443e88 | 506 | buffer = must_realloc(NULL, size); |
6d1a5f93 | 507 | ret = snprintf(buffer, size, "exec %s %s %s", script, name, section); |
0fd73091 | 508 | if (ret < 0 || ret >= size) |
9ba8130c | 509 | return -1; |
751d9dcd | 510 | |
abbfd20b | 511 | va_start(ap, script); |
9ba8130c | 512 | while ((p = va_arg(ap, char *))) { |
062b72c6 | 513 | int len = size - ret; |
9ba8130c SH |
514 | int rc; |
515 | rc = snprintf(buffer + ret, len, " %s", p); | |
7b5a2435 DJ |
516 | if (rc < 0 || rc >= len) { |
517 | va_end(ap); | |
9ba8130c | 518 | return -1; |
7b5a2435 | 519 | } |
9ba8130c SH |
520 | ret += rc; |
521 | } | |
abbfd20b | 522 | va_end(ap); |
751d9dcd | 523 | |
91c3830e | 524 | return run_buffer(buffer); |
e3b4c4c4 ST |
525 | } |
526 | ||
0fd73091 | 527 | /* pin_rootfs |
63fc76c3 | 528 | * if rootfs is a directory, then open ${rootfs}/.lxc-keep for writing for |
b7ed4bf0 CS |
529 | * the duration of the container run, to prevent the container from marking |
530 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
63fc76c3 GJ |
531 | * no name pollution is happens. |
532 | * don't unlink on NFS to avoid random named stale handles. | |
0c547523 SH |
533 | * return -1 on error. |
534 | * return -2 if nothing needed to be pinned. | |
535 | * return an open fd (>=0) if we pinned it. | |
536 | */ | |
537 | int pin_rootfs(const char *rootfs) | |
538 | { | |
957c4704 | 539 | __do_free char *absrootfs = NULL; |
0fd73091 | 540 | int fd, ret; |
6b5a54cd | 541 | char absrootfspin[PATH_MAX]; |
0c547523 | 542 | struct stat s; |
63fc76c3 | 543 | struct statfs sfs; |
0c547523 | 544 | |
e99ee0de | 545 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 546 | return -2; |
e99ee0de | 547 | |
74e7b662 | 548 | absrootfs = realpath(rootfs, NULL); |
549 | if (!absrootfs) | |
9be53773 | 550 | return -2; |
0c547523 | 551 | |
0fd73091 | 552 | ret = stat(absrootfs, &s); |
957c4704 | 553 | if (ret < 0) |
0c547523 | 554 | return -1; |
0c547523 | 555 | |
957c4704 | 556 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
557 | return -2; |
558 | ||
6b5a54cd | 559 | ret = snprintf(absrootfspin, PATH_MAX, "%s/.lxc-keep", absrootfs); |
6b5a54cd | 560 | if (ret < 0 || ret >= PATH_MAX) |
0c547523 | 561 | return -1; |
0c547523 | 562 | |
0fd73091 | 563 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR | S_IRUSR); |
b7ed4bf0 CS |
564 | if (fd < 0) |
565 | return fd; | |
0fd73091 | 566 | |
205fc010 CB |
567 | ret = fstatfs (fd, &sfs); |
568 | if (ret < 0) | |
569 | return fd; | |
63fc76c3 GJ |
570 | |
571 | if (sfs.f_type == NFS_SUPER_MAGIC) { | |
205fc010 | 572 | DEBUG("Rootfs on NFS, not unlinking pin file \"%s\"", absrootfspin); |
63fc76c3 GJ |
573 | return fd; |
574 | } | |
575 | ||
b7ed4bf0 | 576 | (void)unlink(absrootfspin); |
0fd73091 | 577 | |
0c547523 SH |
578 | return fd; |
579 | } | |
580 | ||
0fd73091 CB |
581 | /* If we are asking to remount something, make sure that any NOEXEC etc are |
582 | * honored. | |
e2a7e8dc | 583 | */ |
5ae72b98 | 584 | unsigned long add_required_remount_flags(const char *s, const char *d, |
5285689c | 585 | unsigned long flags) |
e2a7e8dc | 586 | { |
614305f3 | 587 | #ifdef HAVE_STATVFS |
0fd73091 | 588 | int ret; |
e2a7e8dc SH |
589 | struct statvfs sb; |
590 | unsigned long required_flags = 0; | |
591 | ||
e2a7e8dc SH |
592 | if (!s) |
593 | s = d; | |
594 | ||
595 | if (!s) | |
596 | return flags; | |
0fd73091 CB |
597 | |
598 | ret = statvfs(s, &sb); | |
599 | if (ret < 0) | |
e2a7e8dc SH |
600 | return flags; |
601 | ||
69eadddb CB |
602 | if (flags & MS_REMOUNT) { |
603 | if (sb.f_flag & MS_NOSUID) | |
604 | required_flags |= MS_NOSUID; | |
605 | if (sb.f_flag & MS_NODEV) | |
606 | required_flags |= MS_NODEV; | |
607 | if (sb.f_flag & MS_RDONLY) | |
608 | required_flags |= MS_RDONLY; | |
609 | if (sb.f_flag & MS_NOEXEC) | |
610 | required_flags |= MS_NOEXEC; | |
611 | } | |
612 | ||
613 | if (sb.f_flag & MS_NOATIME) | |
614 | required_flags |= MS_NOATIME; | |
615 | if (sb.f_flag & MS_NODIRATIME) | |
616 | required_flags |= MS_NODIRATIME; | |
617 | if (sb.f_flag & MS_LAZYTIME) | |
618 | required_flags |= MS_LAZYTIME; | |
619 | if (sb.f_flag & MS_RELATIME) | |
620 | required_flags |= MS_RELATIME; | |
621 | if (sb.f_flag & MS_STRICTATIME) | |
622 | required_flags |= MS_STRICTATIME; | |
e2a7e8dc SH |
623 | |
624 | return flags | required_flags; | |
614305f3 SH |
625 | #else |
626 | return flags; | |
627 | #endif | |
e2a7e8dc SH |
628 | } |
629 | ||
6b741397 CB |
630 | static int add_shmount_to_list(struct lxc_conf *conf) |
631 | { | |
6b5a54cd | 632 | char new_mount[PATH_MAX]; |
0d190408 | 633 | /* Offset for the leading '/' since the path_cont |
6b741397 CB |
634 | * is absolute inside the container. |
635 | */ | |
636 | int offset = 1, ret = -1; | |
0d190408 | 637 | |
6b741397 CB |
638 | ret = snprintf(new_mount, sizeof(new_mount), |
639 | "%s %s none bind,create=dir 0 0", conf->shmount.path_host, | |
640 | conf->shmount.path_cont + offset); | |
60534030 | 641 | if (ret < 0 || (size_t)ret >= sizeof(new_mount)) |
0d190408 LT |
642 | return -1; |
643 | ||
6b741397 | 644 | return add_elem_to_mount_list(new_mount, conf); |
0d190408 LT |
645 | } |
646 | ||
4fb3cba5 | 647 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 648 | { |
0fd73091 | 649 | int i, r; |
b06b8511 CS |
650 | static struct { |
651 | int match_mask; | |
652 | int match_flag; | |
653 | const char *source; | |
654 | const char *destination; | |
655 | const char *fstype; | |
656 | unsigned long flags; | |
657 | const char *options; | |
658 | } default_mounts[] = { | |
0fd73091 CB |
659 | /* Read-only bind-mounting... In older kernels, doing that |
660 | * required to do one MS_BIND mount and then | |
661 | * MS_REMOUNT|MS_RDONLY the same one. According to mount(2) | |
662 | * manpage, MS_BIND honors MS_RDONLY from kernel 2.6.26 | |
663 | * onwards. However, this apparently does not work on kernel | |
664 | * 3.8. Unfortunately, on that very same kernel, doing the same | |
665 | * trick as above doesn't seem to work either, there one needs | |
666 | * to ALSO specify MS_BIND for the remount, otherwise the | |
667 | * entire fs is remounted read-only or the mount fails because | |
668 | * it's busy... MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for | |
669 | * kernels as low as 2.6.32... | |
368bbc02 | 670 | */ |
0fd73091 | 671 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
592fd47a | 672 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
0fd73091 CB |
673 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL }, |
674 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, | |
675 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
676 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL }, | |
677 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, | |
678 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
679 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
680 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
681 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
682 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
d1c203f4 | 683 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys", "%r/sys", NULL, MS_BIND, NULL }, |
0fd73091 CB |
684 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, |
685 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
686 | { 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 }, | |
687 | { 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 }, | |
688 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 689 | }; |
368bbc02 | 690 | |
b06b8511 | 691 | for (i = 0; default_mounts[i].match_mask; i++) { |
8db92302 | 692 | __do_free char *destination = NULL, *source = NULL; |
0fd73091 CB |
693 | int saved_errno; |
694 | unsigned long mflags; | |
0fd73091 CB |
695 | if ((flags & default_mounts[i].match_mask) != default_mounts[i].match_flag) |
696 | continue; | |
697 | ||
698 | if (default_mounts[i].source) { | |
cc4fd506 | 699 | /* will act like strdup if %r is not present */ |
0fd73091 CB |
700 | source = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].source); |
701 | if (!source) | |
cc4fd506 | 702 | return -1; |
0fd73091 | 703 | } |
f24a52d5 | 704 | |
0fd73091 CB |
705 | if (!default_mounts[i].destination) { |
706 | ERROR("BUG: auto mounts destination %d was NULL", i); | |
0fd73091 CB |
707 | return -1; |
708 | } | |
709 | ||
710 | /* will act like strdup if %r is not present */ | |
711 | destination = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].destination); | |
712 | if (!destination) { | |
0fd73091 CB |
713 | return -1; |
714 | } | |
715 | ||
716 | mflags = add_required_remount_flags(source, destination, | |
717 | default_mounts[i].flags); | |
718 | r = safe_mount(source, destination, default_mounts[i].fstype, | |
719 | mflags, default_mounts[i].options, | |
720 | conf->rootfs.path ? conf->rootfs.mount : NULL); | |
721 | saved_errno = errno; | |
722 | if (r < 0 && errno == ENOENT) { | |
723 | INFO("Mount source or target for \"%s\" on \"%s\" does " | |
724 | "not exist. Skipping", source, destination); | |
725 | r = 0; | |
726 | } else if (r < 0) { | |
727 | SYSERROR("Failed to mount \"%s\" on \"%s\" with flags %lu", source, destination, mflags); | |
728 | } | |
729 | ||
0fd73091 CB |
730 | if (r < 0) { |
731 | errno = saved_errno; | |
732 | return -1; | |
368bbc02 | 733 | } |
368bbc02 CS |
734 | } |
735 | ||
b06b8511 | 736 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
737 | int cg_flags; |
738 | ||
3f69fb12 | 739 | cg_flags = flags & (LXC_AUTO_CGROUP_MASK & ~LXC_AUTO_CGROUP_FORCE); |
0fd73091 CB |
740 | /* If the type of cgroup mount was not specified, it depends on |
741 | * the container's capabilities as to what makes sense: if we | |
742 | * have CAP_SYS_ADMIN, the read-only part can be remounted | |
743 | * read-write anyway, so we may as well default to read-write; | |
744 | * then the admin will not be given a false sense of security. | |
745 | * (And if they really want mixed r/o r/w, then they can | |
746 | * explicitly specify :mixed.) OTOH, if the container lacks | |
747 | * CAP_SYS_ADMIN, do only default to :mixed, because then the | |
748 | * container can't remount it read-write. | |
749 | */ | |
0769b82a CS |
750 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { |
751 | int has_sys_admin = 0; | |
b0ee5983 CB |
752 | |
753 | if (!lxc_list_empty(&conf->keepcaps)) | |
0769b82a | 754 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); |
b0ee5983 | 755 | else |
0769b82a | 756 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); |
b0ee5983 CB |
757 | |
758 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) | |
0769b82a | 759 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; |
b0ee5983 | 760 | else |
0769b82a | 761 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; |
0769b82a | 762 | } |
0fd73091 | 763 | |
3f69fb12 | 764 | if (flags & LXC_AUTO_CGROUP_FORCE) |
0fd73091 CB |
765 | cg_flags |= LXC_AUTO_CGROUP_FORCE; |
766 | ||
2202afc9 CB |
767 | if (!handler->cgroup_ops->mount(handler->cgroup_ops, |
768 | handler, | |
769 | conf->rootfs.path ? conf->rootfs.mount : "", | |
770 | cg_flags)) { | |
0fd73091 | 771 | SYSERROR("Failed to mount \"/sys/fs/cgroup\""); |
b06b8511 | 772 | return -1; |
368bbc02 CS |
773 | } |
774 | } | |
775 | ||
0d190408 LT |
776 | if (flags & LXC_AUTO_SHMOUNTS_MASK) { |
777 | int ret = add_shmount_to_list(conf); | |
778 | if (ret < 0) { | |
779 | ERROR("Failed to add shmount entry to container config"); | |
6b741397 | 780 | return -1; |
0d190408 LT |
781 | } |
782 | } | |
783 | ||
368bbc02 | 784 | return 0; |
368bbc02 CS |
785 | } |
786 | ||
4e5440c6 | 787 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 788 | { |
0fd73091 CB |
789 | int ret; |
790 | ||
4e5440c6 DL |
791 | if (!utsname) |
792 | return 0; | |
0ad19a3f | 793 | |
0fd73091 CB |
794 | ret = sethostname(utsname->nodename, strlen(utsname->nodename)); |
795 | if (ret < 0) { | |
796 | SYSERROR("Failed to set the hostname to \"%s\"", utsname->nodename); | |
0ad19a3f | 797 | return -1; |
798 | } | |
799 | ||
0fd73091 | 800 | INFO("Set hostname to \"%s\"", utsname->nodename); |
cd54d859 | 801 | |
0ad19a3f | 802 | return 0; |
803 | } | |
804 | ||
69aa6655 DE |
805 | struct dev_symlinks { |
806 | const char *oldpath; | |
807 | const char *name; | |
808 | }; | |
809 | ||
810 | static const struct dev_symlinks dev_symlinks[] = { | |
0fd73091 CB |
811 | { "/proc/self/fd", "fd" }, |
812 | { "/proc/self/fd/0", "stdin" }, | |
813 | { "/proc/self/fd/1", "stdout" }, | |
814 | { "/proc/self/fd/2", "stderr" }, | |
69aa6655 DE |
815 | }; |
816 | ||
ed8704d0 | 817 | static int lxc_setup_dev_symlinks(const struct lxc_rootfs *rootfs) |
69aa6655 | 818 | { |
0fd73091 | 819 | int i, ret; |
6b5a54cd | 820 | char path[PATH_MAX]; |
09227be2 | 821 | struct stat s; |
69aa6655 | 822 | |
69aa6655 DE |
823 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { |
824 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
0fd73091 CB |
825 | |
826 | ret = snprintf(path, sizeof(path), "%s/dev/%s", | |
827 | rootfs->path ? rootfs->mount : "", d->name); | |
6b5a54cd | 828 | if (ret < 0 || ret >= PATH_MAX) |
69aa6655 | 829 | return -1; |
09227be2 | 830 | |
0fd73091 CB |
831 | /* Stat the path first. If we don't get an error accept it as |
832 | * is and don't try to create it | |
09227be2 | 833 | */ |
0fd73091 CB |
834 | ret = stat(path, &s); |
835 | if (ret == 0) | |
09227be2 | 836 | continue; |
09227be2 | 837 | |
69aa6655 DE |
838 | ret = symlink(d->oldpath, path); |
839 | if (ret && errno != EEXIST) { | |
0fd73091 CB |
840 | if (errno == EROFS) { |
841 | WARN("Failed to create \"%s\". Read-only filesystem", path); | |
09227be2 | 842 | } else { |
0fd73091 | 843 | SYSERROR("Failed to create \"%s\"", path); |
09227be2 MW |
844 | return -1; |
845 | } | |
69aa6655 DE |
846 | } |
847 | } | |
0fd73091 | 848 | |
69aa6655 DE |
849 | return 0; |
850 | } | |
851 | ||
2187efd3 | 852 | /* Build a space-separate list of ptys to pass to systemd. */ |
885766f5 | 853 | static bool append_ttyname(char **pp, char *name) |
b0a33c1e | 854 | { |
393903d1 | 855 | char *p; |
f1e05b90 | 856 | size_t size; |
393903d1 SH |
857 | |
858 | if (!*pp) { | |
859 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
860 | if (!*pp) | |
861 | return false; | |
0fd73091 | 862 | |
393903d1 SH |
863 | sprintf(*pp, "container_ttys=%s", name); |
864 | return true; | |
865 | } | |
0fd73091 | 866 | |
f1e05b90 DJ |
867 | size = strlen(*pp) + strlen(name) + 2; |
868 | p = realloc(*pp, size); | |
393903d1 SH |
869 | if (!p) |
870 | return false; | |
0fd73091 | 871 | |
393903d1 | 872 | *pp = p; |
f1e05b90 DJ |
873 | (void)strlcat(p, " ", size); |
874 | (void)strlcat(p, name, size); | |
0fd73091 | 875 | |
393903d1 SH |
876 | return true; |
877 | } | |
878 | ||
2187efd3 | 879 | static int lxc_setup_ttys(struct lxc_conf *conf) |
393903d1 | 880 | { |
9e1045e3 | 881 | int i, ret; |
0e4be3cf | 882 | const struct lxc_tty_info *ttys = &conf->ttys; |
885766f5 | 883 | char *ttydir = ttys->dir; |
6b5a54cd | 884 | char path[PATH_MAX], lxcpath[PATH_MAX]; |
b0a33c1e | 885 | |
e8bd4e43 | 886 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
887 | return 0; |
888 | ||
885766f5 | 889 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 890 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
b0a33c1e | 891 | |
e8bd4e43 | 892 | ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1); |
73363c61 | 893 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 894 | return -1; |
9e1045e3 | 895 | |
7c6ef2a2 SH |
896 | if (ttydir) { |
897 | /* create dev/lxc/tty%d" */ | |
9e1045e3 CB |
898 | ret = snprintf(lxcpath, sizeof(lxcpath), |
899 | "/dev/%s/tty%d", ttydir, i + 1); | |
73363c61 | 900 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
7c6ef2a2 | 901 | return -1; |
9e1045e3 | 902 | |
adc1c715 | 903 | ret = mknod(lxcpath, S_IFREG | 0000, 0); |
9e1045e3 | 904 | if (ret < 0 && errno != EEXIST) { |
73363c61 | 905 | SYSERROR("Failed to create \"%s\"", lxcpath); |
7c6ef2a2 SH |
906 | return -1; |
907 | } | |
9e1045e3 | 908 | |
7c6ef2a2 | 909 | ret = unlink(path); |
9e1045e3 | 910 | if (ret < 0 && errno != ENOENT) { |
73363c61 | 911 | SYSERROR("Failed to unlink \"%s\"", path); |
7c6ef2a2 SH |
912 | return -1; |
913 | } | |
b0a33c1e | 914 | |
2520facd | 915 | ret = mount(tty->name, lxcpath, "none", MS_BIND, 0); |
9e1045e3 | 916 | if (ret < 0) { |
adc1c715 WB |
917 | SYSWARN("Failed to bind mount \"%s\" onto \"%s\"", |
918 | tty->name, lxcpath); | |
7c6ef2a2 SH |
919 | continue; |
920 | } | |
0fd73091 | 921 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, |
adc1c715 | 922 | lxcpath); |
13954cce | 923 | |
9e1045e3 CB |
924 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", |
925 | ttydir, i + 1); | |
73363c61 | 926 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
9ba8130c | 927 | return -1; |
9e1045e3 | 928 | |
7c6ef2a2 | 929 | ret = symlink(lxcpath, path); |
9e1045e3 | 930 | if (ret < 0) { |
73363c61 | 931 | SYSERROR("Failed to create symlink \"%s\" -> \"%s\"", |
9e1045e3 | 932 | path, lxcpath); |
7c6ef2a2 SH |
933 | return -1; |
934 | } | |
935 | } else { | |
9e1045e3 CB |
936 | /* If we populated /dev, then we need to create |
937 | * /dev/ttyN | |
938 | */ | |
d3ccc04e CB |
939 | ret = mknod(path, S_IFREG | 0000, 0); |
940 | if (ret < 0) /* this isn't fatal, continue */ | |
6d1400b5 | 941 | SYSERROR("Failed to create \"%s\"", path); |
9e1045e3 | 942 | |
2520facd | 943 | ret = mount(tty->name, path, "none", MS_BIND, 0); |
9e1045e3 | 944 | if (ret < 0) { |
2520facd | 945 | SYSERROR("Failed to mount '%s'->'%s'", tty->name, path); |
7c6ef2a2 SH |
946 | continue; |
947 | } | |
9e1045e3 | 948 | |
d3ccc04e | 949 | DEBUG("Bind mounted \"%s\" onto \"%s\"", tty->name, path); |
393903d1 | 950 | } |
9e1045e3 | 951 | |
885766f5 | 952 | if (!append_ttyname(&conf->ttys.tty_names, tty->name)) { |
393903d1 SH |
953 | ERROR("Error setting up container_ttys string"); |
954 | return -1; | |
b0a33c1e | 955 | } |
956 | } | |
957 | ||
885766f5 | 958 | INFO("Finished setting up %zu /dev/tty<N> device(s)", ttys->max); |
b0a33c1e | 959 | return 0; |
960 | } | |
961 | ||
663014ee | 962 | int lxc_allocate_ttys(struct lxc_conf *conf) |
2187efd3 | 963 | { |
fca23691 | 964 | size_t i; |
965 | int ret; | |
0fd73091 | 966 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 CB |
967 | |
968 | /* no tty in the configuration */ | |
885766f5 | 969 | if (ttys->max == 0) |
2187efd3 CB |
970 | return 0; |
971 | ||
885766f5 | 972 | ttys->tty = malloc(sizeof(*ttys->tty) * ttys->max); |
0e4be3cf | 973 | if (!ttys->tty) |
2187efd3 | 974 | return -ENOMEM; |
2187efd3 | 975 | |
885766f5 | 976 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 977 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 978 | |
386e6768 CB |
979 | tty->master = -EBADF; |
980 | tty->slave = -EBADF; | |
77a39805 CB |
981 | ret = openpty(&tty->master, &tty->slave, NULL, NULL, NULL); |
982 | if (ret < 0) { | |
fca23691 | 983 | SYSERROR("Failed to create tty %zu", i); |
885766f5 | 984 | ttys->max = i; |
0e4be3cf | 985 | lxc_delete_tty(ttys); |
2187efd3 CB |
986 | return -ENOTTY; |
987 | } | |
988 | ||
77a39805 CB |
989 | ret = ttyname_r(tty->slave, tty->name, sizeof(tty->name)); |
990 | if (ret < 0) { | |
fca23691 | 991 | SYSERROR("Failed to retrieve name of tty %zu slave", i); |
77a39805 CB |
992 | ttys->max = i; |
993 | lxc_delete_tty(ttys); | |
994 | return -ENOTTY; | |
995 | } | |
996 | ||
0fd73091 | 997 | DEBUG("Created tty \"%s\" with master fd %d and slave fd %d", |
2520facd | 998 | tty->name, tty->master, tty->slave); |
2187efd3 CB |
999 | |
1000 | /* Prevent leaking the file descriptors to the container */ | |
615f24ff | 1001 | ret = fd_cloexec(tty->master, true); |
2187efd3 | 1002 | if (ret < 0) |
a24c5678 | 1003 | SYSWARN("Failed to set FD_CLOEXEC flag on master fd %d of " |
1004 | "tty device \"%s\"", tty->master, tty->name); | |
2187efd3 | 1005 | |
615f24ff | 1006 | ret = fd_cloexec(tty->slave, true); |
2187efd3 | 1007 | if (ret < 0) |
a24c5678 | 1008 | SYSWARN("Failed to set FD_CLOEXEC flag on slave fd %d of " |
1009 | "tty device \"%s\"", tty->slave, tty->name); | |
2187efd3 | 1010 | |
2520facd | 1011 | tty->busy = 0; |
2187efd3 CB |
1012 | } |
1013 | ||
885766f5 | 1014 | INFO("Finished creating %zu tty devices", ttys->max); |
2187efd3 CB |
1015 | return 0; |
1016 | } | |
1017 | ||
0e4be3cf | 1018 | void lxc_delete_tty(struct lxc_tty_info *ttys) |
2187efd3 CB |
1019 | { |
1020 | int i; | |
1021 | ||
386e6768 CB |
1022 | if (!ttys->tty) |
1023 | return; | |
1024 | ||
885766f5 | 1025 | for (i = 0; i < ttys->max; i++) { |
0e4be3cf | 1026 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1027 | |
386e6768 CB |
1028 | if (tty->master >= 0) { |
1029 | close(tty->master); | |
1030 | tty->master = -EBADF; | |
1031 | } | |
1032 | ||
1033 | if (tty->slave >= 0) { | |
1034 | close(tty->slave); | |
1035 | tty->slave = -EBADF; | |
1036 | } | |
2187efd3 CB |
1037 | } |
1038 | ||
0e4be3cf CB |
1039 | free(ttys->tty); |
1040 | ttys->tty = NULL; | |
2187efd3 CB |
1041 | } |
1042 | ||
1043 | static int lxc_send_ttys_to_parent(struct lxc_handler *handler) | |
1044 | { | |
1045 | int i; | |
0fd73091 | 1046 | int ret = -1; |
2187efd3 | 1047 | struct lxc_conf *conf = handler->conf; |
0e4be3cf | 1048 | struct lxc_tty_info *ttys = &conf->ttys; |
2187efd3 | 1049 | int sock = handler->data_sock[0]; |
2187efd3 | 1050 | |
885766f5 | 1051 | if (ttys->max == 0) |
2187efd3 CB |
1052 | return 0; |
1053 | ||
885766f5 | 1054 | for (i = 0; i < ttys->max; i++) { |
2187efd3 | 1055 | int ttyfds[2]; |
0e4be3cf | 1056 | struct lxc_terminal_info *tty = &ttys->tty[i]; |
2187efd3 | 1057 | |
2520facd CB |
1058 | ttyfds[0] = tty->master; |
1059 | ttyfds[1] = tty->slave; | |
2187efd3 CB |
1060 | |
1061 | ret = lxc_abstract_unix_send_fds(sock, ttyfds, 2, NULL, 0); | |
1062 | if (ret < 0) | |
1063 | break; | |
1064 | ||
7d7333b3 | 1065 | TRACE("Sent tty \"%s\" with master fd %d and slave fd %d to " |
2520facd | 1066 | "parent", tty->name, tty->master, tty->slave); |
2187efd3 CB |
1067 | } |
1068 | ||
1069 | if (ret < 0) | |
6d1400b5 | 1070 | SYSERROR("Failed to send %zu ttys to parent", ttys->max); |
2187efd3 | 1071 | else |
885766f5 | 1072 | TRACE("Sent %zu ttys to parent", ttys->max); |
2187efd3 CB |
1073 | |
1074 | return ret; | |
1075 | } | |
1076 | ||
1077 | static int lxc_create_ttys(struct lxc_handler *handler) | |
1078 | { | |
1079 | int ret = -1; | |
1080 | struct lxc_conf *conf = handler->conf; | |
1081 | ||
663014ee | 1082 | ret = lxc_allocate_ttys(conf); |
2187efd3 CB |
1083 | if (ret < 0) { |
1084 | ERROR("Failed to allocate ttys"); | |
1085 | goto on_error; | |
1086 | } | |
1087 | ||
1088 | ret = lxc_send_ttys_to_parent(handler); | |
1089 | if (ret < 0) { | |
1090 | ERROR("Failed to send ttys to parent"); | |
1091 | goto on_error; | |
1092 | } | |
1093 | ||
1094 | if (!conf->is_execute) { | |
1095 | ret = lxc_setup_ttys(conf); | |
1096 | if (ret < 0) { | |
1097 | ERROR("Failed to setup ttys"); | |
1098 | goto on_error; | |
1099 | } | |
1100 | } | |
1101 | ||
885766f5 CB |
1102 | if (conf->ttys.tty_names) { |
1103 | ret = setenv("container_ttys", conf->ttys.tty_names, 1); | |
2187efd3 | 1104 | if (ret < 0) |
885766f5 | 1105 | SYSERROR("Failed to set \"container_ttys=%s\"", conf->ttys.tty_names); |
2187efd3 CB |
1106 | } |
1107 | ||
1108 | ret = 0; | |
1109 | ||
1110 | on_error: | |
0e4be3cf | 1111 | lxc_delete_tty(&conf->ttys); |
2187efd3 CB |
1112 | |
1113 | return ret; | |
1114 | } | |
1115 | ||
7133b912 CB |
1116 | /* Just create a path for /dev under $lxcpath/$name and in rootfs If we hit an |
1117 | * error, log it but don't fail yet. | |
91c3830e | 1118 | */ |
7133b912 CB |
1119 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, |
1120 | const char *lxcpath) | |
91c3830e | 1121 | { |
2f443e88 | 1122 | __do_free char *path = NULL; |
91c3830e | 1123 | int ret; |
87da4ec3 | 1124 | size_t clen; |
87e0e273 | 1125 | mode_t cur_mask; |
91c3830e | 1126 | |
7133b912 | 1127 | INFO("Preparing \"/dev\""); |
bc6928ff | 1128 | |
14221cbb | 1129 | /* $(rootfs->mount) + "/dev/pts" + '\0' */ |
ec50007f | 1130 | clen = (rootfs->path ? strlen(rootfs->mount) : 0) + 9; |
2f443e88 | 1131 | path = must_realloc(NULL, clen); |
bc6928ff | 1132 | |
ec50007f | 1133 | ret = snprintf(path, clen, "%s/dev", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1134 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1135 | return -1; |
bc6928ff | 1136 | |
87e0e273 CB |
1137 | cur_mask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
1138 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
1139 | if (ret < 0 && errno != EEXIST) { | |
1140 | SYSERROR("Failed to create \"/dev\" directory"); | |
1141 | ret = -errno; | |
1142 | goto reset_umask; | |
bc6928ff | 1143 | } |
87da4ec3 | 1144 | |
1ec0e8e3 | 1145 | ret = safe_mount("none", path, "tmpfs", 0, "size=500000,mode=755", |
7133b912 CB |
1146 | rootfs->path ? rootfs->mount : NULL); |
1147 | if (ret < 0) { | |
1148 | SYSERROR("Failed to mount tmpfs on \"%s\"", path); | |
87e0e273 | 1149 | goto reset_umask; |
91c3830e | 1150 | } |
87e0e273 | 1151 | TRACE("Mounted tmpfs on \"%s\"", path); |
87da4ec3 | 1152 | |
ec50007f | 1153 | ret = snprintf(path, clen, "%s/dev/pts", rootfs->path ? rootfs->mount : ""); |
87e0e273 CB |
1154 | if (ret < 0 || (size_t)ret >= clen) { |
1155 | ret = -1; | |
1156 | goto reset_umask; | |
1157 | } | |
87da4ec3 | 1158 | |
7133b912 | 1159 | /* If we are running on a devtmpfs mapping, dev/pts may already exist. |
bc6928ff MW |
1160 | * If not, then create it and exit if that fails... |
1161 | */ | |
87e0e273 CB |
1162 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
1163 | if (ret < 0 && errno != EEXIST) { | |
1164 | SYSERROR("Failed to create directory \"%s\"", path); | |
1165 | ret = -errno; | |
1166 | goto reset_umask; | |
91c3830e SH |
1167 | } |
1168 | ||
87e0e273 CB |
1169 | ret = 0; |
1170 | ||
1171 | reset_umask: | |
1172 | (void)umask(cur_mask); | |
1173 | ||
7133b912 | 1174 | INFO("Prepared \"/dev\""); |
87e0e273 | 1175 | return ret; |
91c3830e SH |
1176 | } |
1177 | ||
5e73416f | 1178 | struct lxc_device_node { |
74a3920a | 1179 | const char *name; |
5e73416f CB |
1180 | const mode_t mode; |
1181 | const int maj; | |
1182 | const int min; | |
c6883f38 SH |
1183 | }; |
1184 | ||
5e73416f | 1185 | static const struct lxc_device_node lxc_devices[] = { |
06749971 | 1186 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, |
5e73416f | 1187 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
06749971 CB |
1188 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, |
1189 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
5e73416f CB |
1190 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, |
1191 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
c6883f38 SH |
1192 | }; |
1193 | ||
5067e4dd CB |
1194 | |
1195 | enum { | |
1196 | LXC_DEVNODE_BIND, | |
1197 | LXC_DEVNODE_MKNOD, | |
1198 | LXC_DEVNODE_PARTIAL, | |
1199 | LXC_DEVNODE_OPEN, | |
1200 | }; | |
1201 | ||
27245ff7 | 1202 | static int lxc_fill_autodev(const struct lxc_rootfs *rootfs) |
c6883f38 | 1203 | { |
5e73416f | 1204 | int i, ret; |
6b5a54cd | 1205 | char path[PATH_MAX]; |
3a32201c | 1206 | mode_t cmask; |
5067e4dd | 1207 | int use_mknod = LXC_DEVNODE_MKNOD; |
c6883f38 | 1208 | |
6b5a54cd | 1209 | ret = snprintf(path, PATH_MAX, "%s/dev", |
3999be0a | 1210 | rootfs->path ? rootfs->mount : ""); |
6b5a54cd | 1211 | if (ret < 0 || ret >= PATH_MAX) |
c6883f38 | 1212 | return -1; |
91c3830e | 1213 | |
0bbf8572 CB |
1214 | /* ignore, just don't try to fill in */ |
1215 | if (!dir_exists(path)) | |
9cb4d183 SH |
1216 | return 0; |
1217 | ||
3999be0a CB |
1218 | INFO("Populating \"/dev\""); |
1219 | ||
3a32201c | 1220 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
5e73416f | 1221 | for (i = 0; i < sizeof(lxc_devices) / sizeof(lxc_devices[0]); i++) { |
6b5a54cd | 1222 | char hostpath[PATH_MAX]; |
5e73416f | 1223 | const struct lxc_device_node *device = &lxc_devices[i]; |
0728ebf4 | 1224 | |
6b5a54cd | 1225 | ret = snprintf(path, PATH_MAX, "%s/dev/%s", |
5e73416f | 1226 | rootfs->path ? rootfs->mount : "", device->name); |
6b5a54cd | 1227 | if (ret < 0 || ret >= PATH_MAX) |
c6883f38 | 1228 | return -1; |
0bbf8572 | 1229 | |
5067e4dd | 1230 | if (use_mknod >= LXC_DEVNODE_MKNOD) { |
5e73416f CB |
1231 | ret = mknod(path, device->mode, makedev(device->maj, device->min)); |
1232 | if (ret == 0 || (ret < 0 && errno == EEXIST)) { | |
1233 | DEBUG("Created device node \"%s\"", path); | |
5067e4dd CB |
1234 | } else if (ret < 0) { |
1235 | if (errno != EPERM) { | |
1236 | SYSERROR("Failed to create device node \"%s\"", path); | |
1237 | return -1; | |
1238 | } | |
0bbf8572 | 1239 | |
5067e4dd | 1240 | use_mknod = LXC_DEVNODE_BIND; |
9cb4d183 | 1241 | } |
3999be0a | 1242 | |
5067e4dd CB |
1243 | /* Device nodes are fully useable. */ |
1244 | if (use_mknod == LXC_DEVNODE_OPEN) | |
1245 | continue; | |
1246 | ||
1247 | if (use_mknod == LXC_DEVNODE_MKNOD) { | |
1248 | /* See | |
1249 | * - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=55956b59df336f6738da916dbb520b6e37df9fbd | |
1250 | * - https://lists.linuxfoundation.org/pipermail/containers/2018-June/039176.html | |
1251 | */ | |
1252 | ret = open(path, O_RDONLY | O_CLOEXEC); | |
1253 | if (ret >= 0) { | |
1254 | close(ret); | |
1255 | /* Device nodes are fully useable. */ | |
1256 | use_mknod = LXC_DEVNODE_OPEN; | |
1257 | continue; | |
1258 | } | |
1259 | ||
1260 | SYSTRACE("Failed to open \"%s\" device", path); | |
1261 | /* Device nodes are only partially useable. */ | |
1262 | use_mknod = LXC_DEVNODE_PARTIAL; | |
1263 | } | |
5e73416f CB |
1264 | } |
1265 | ||
5067e4dd CB |
1266 | if (use_mknod != LXC_DEVNODE_PARTIAL) { |
1267 | /* If we are dealing with partially functional device | |
1268 | * nodes the prio mknod() call will have created the | |
1269 | * device node so we can use it as a bind-mount target. | |
1270 | */ | |
1271 | ret = mknod(path, S_IFREG | 0000, 0); | |
1272 | if (ret < 0 && errno != EEXIST) { | |
1273 | SYSERROR("Failed to create file \"%s\"", path); | |
1274 | return -1; | |
1275 | } | |
5e73416f CB |
1276 | } |
1277 | ||
1278 | /* Fallback to bind-mounting the device from the host. */ | |
6b5a54cd CB |
1279 | ret = snprintf(hostpath, PATH_MAX, "/dev/%s", device->name); |
1280 | if (ret < 0 || ret >= PATH_MAX) | |
5e73416f CB |
1281 | return -1; |
1282 | ||
1283 | ret = safe_mount(hostpath, path, 0, MS_BIND, NULL, | |
1284 | rootfs->path ? rootfs->mount : NULL); | |
1285 | if (ret < 0) { | |
1286 | SYSERROR("Failed to bind mount host device node \"%s\" " | |
1287 | "onto \"%s\"", hostpath, path); | |
1288 | return -1; | |
c6883f38 | 1289 | } |
5e73416f CB |
1290 | DEBUG("Bind mounted host device node \"%s\" onto \"%s\"", |
1291 | hostpath, path); | |
c6883f38 | 1292 | } |
5e73416f | 1293 | (void)umask(cmask); |
c6883f38 | 1294 | |
3999be0a | 1295 | INFO("Populated \"/dev\""); |
c6883f38 SH |
1296 | return 0; |
1297 | } | |
1298 | ||
8ce1abc2 | 1299 | static int lxc_mount_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1300 | { |
9aa76a17 | 1301 | int ret; |
10bc1861 | 1302 | struct lxc_storage *bdev; |
8ce1abc2 | 1303 | const struct lxc_rootfs *rootfs = &conf->rootfs; |
cc28d0b0 | 1304 | |
a0f379bf | 1305 | if (!rootfs->path) { |
0fd73091 CB |
1306 | ret = mount("", "/", NULL, MS_SLAVE | MS_REC, 0); |
1307 | if (ret < 0) { | |
8ce1abc2 | 1308 | SYSERROR("Failed to remount \"/\" MS_REC | MS_SLAVE"); |
a0f379bf DW |
1309 | return -1; |
1310 | } | |
0fd73091 | 1311 | |
c69bd12f | 1312 | return 0; |
a0f379bf | 1313 | } |
0ad19a3f | 1314 | |
0fd73091 CB |
1315 | ret = access(rootfs->mount, F_OK); |
1316 | if (ret != 0) { | |
1317 | SYSERROR("Failed to access to \"%s\". Check it is present", | |
12297168 | 1318 | rootfs->mount); |
b1789442 DL |
1319 | return -1; |
1320 | } | |
1321 | ||
8a388ed4 | 1322 | bdev = storage_init(conf); |
9aa76a17 | 1323 | if (!bdev) { |
0fd73091 | 1324 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1325 | rootfs->path, rootfs->mount, |
1326 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1327 | return -1; |
9be53773 | 1328 | } |
9aa76a17 CB |
1329 | |
1330 | ret = bdev->ops->mount(bdev); | |
10bc1861 | 1331 | storage_put(bdev); |
9aa76a17 | 1332 | if (ret < 0) { |
0fd73091 | 1333 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1334 | rootfs->path, rootfs->mount, |
1335 | rootfs->options ? rootfs->options : "(null)"); | |
c3f0a28c | 1336 | return -1; |
1337 | } | |
0ad19a3f | 1338 | |
0fd73091 | 1339 | DEBUG("Mounted rootfs \"%s\" onto \"%s\" with options \"%s\"", |
91c3e281 CB |
1340 | rootfs->path, rootfs->mount, |
1341 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1342 | |
ac778708 DL |
1343 | return 0; |
1344 | } | |
1345 | ||
8ce1abc2 | 1346 | int lxc_chroot(const struct lxc_rootfs *rootfs) |
91e93c71 | 1347 | { |
b8d88764 | 1348 | __do_free char *nroot = NULL; |
0fd73091 CB |
1349 | int i, ret; |
1350 | char *p, *p2; | |
74e7b662 | 1351 | char buf[LXC_LINELEN]; |
91e93c71 | 1352 | FILE *f; |
8ce1abc2 | 1353 | char *root = rootfs->mount; |
91e93c71 | 1354 | |
74e7b662 | 1355 | nroot = realpath(root, NULL); |
1356 | if (!nroot) { | |
8ce1abc2 | 1357 | SYSERROR("Failed to resolve \"%s\"", root); |
0fd73091 | 1358 | return -1; |
8ce1abc2 | 1359 | } |
91e93c71 | 1360 | |
0fd73091 | 1361 | ret = chdir("/"); |
b8d88764 | 1362 | if (ret < 0) |
0fd73091 | 1363 | return -1; |
91e93c71 | 1364 | |
0fd73091 CB |
1365 | /* We could use here MS_MOVE, but in userns this mount is locked and |
1366 | * can't be moved. | |
91e93c71 | 1367 | */ |
8ce1abc2 | 1368 | ret = mount(nroot, "/", NULL, MS_REC | MS_BIND, NULL); |
0fd73091 | 1369 | if (ret < 0) { |
8ce1abc2 | 1370 | SYSERROR("Failed to mount \"%s\" onto \"/\" as MS_REC | MS_BIND", nroot); |
0fd73091 | 1371 | return -1; |
91e93c71 AV |
1372 | } |
1373 | ||
0fd73091 CB |
1374 | ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL); |
1375 | if (ret < 0) { | |
8ce1abc2 | 1376 | SYSERROR("Failed to remount \"/\""); |
0fd73091 | 1377 | return -1; |
91e93c71 AV |
1378 | } |
1379 | ||
aa899945 | 1380 | /* The following code cleans up inherited mounts which are not required |
0fd73091 | 1381 | * for CT. |
91e93c71 AV |
1382 | * |
1383 | * The mountinfo file shows not all mounts, if a few points have been | |
1384 | * unmounted between read operations from the mountinfo. So we need to | |
1385 | * read mountinfo a few times. | |
1386 | * | |
7ded5fa7 | 1387 | * This loop can be skipped if a container uses userns, because all |
91e93c71 AV |
1388 | * inherited mounts are locked and we should live with all this trash. |
1389 | */ | |
0fd73091 | 1390 | for (;;) { |
91e93c71 AV |
1391 | int progress = 0; |
1392 | ||
1393 | f = fopen("./proc/self/mountinfo", "r"); | |
1394 | if (!f) { | |
8ce1abc2 | 1395 | SYSERROR("Failed to open \"/proc/self/mountinfo\""); |
91e93c71 AV |
1396 | return -1; |
1397 | } | |
0fd73091 | 1398 | |
eab15c1e | 1399 | while (fgets(buf, LXC_LINELEN, f)) { |
91e93c71 AV |
1400 | for (p = buf, i=0; p && i < 4; i++) |
1401 | p = strchr(p+1, ' '); | |
0fd73091 | 1402 | |
91e93c71 AV |
1403 | if (!p) |
1404 | continue; | |
0fd73091 | 1405 | |
91e93c71 AV |
1406 | p2 = strchr(p+1, ' '); |
1407 | if (!p2) | |
1408 | continue; | |
1409 | ||
1410 | *p2 = '\0'; | |
1411 | *p = '.'; | |
1412 | ||
1413 | if (strcmp(p + 1, "/") == 0) | |
1414 | continue; | |
0fd73091 | 1415 | |
91e93c71 AV |
1416 | if (strcmp(p + 1, "/proc") == 0) |
1417 | continue; | |
1418 | ||
0fd73091 CB |
1419 | ret = umount2(p, MNT_DETACH); |
1420 | if (ret == 0) | |
91e93c71 AV |
1421 | progress++; |
1422 | } | |
0fd73091 | 1423 | |
91e93c71 | 1424 | fclose(f); |
0fd73091 | 1425 | |
91e93c71 AV |
1426 | if (!progress) |
1427 | break; | |
1428 | } | |
1429 | ||
7ded5fa7 | 1430 | /* This also can be skipped if a container uses userns. */ |
0fd73091 | 1431 | (void)umount2("./proc", MNT_DETACH); |
91e93c71 AV |
1432 | |
1433 | /* It is weird, but chdir("..") moves us in a new root */ | |
0fd73091 CB |
1434 | ret = chdir(".."); |
1435 | if (ret < 0) { | |
8ce1abc2 | 1436 | SYSERROR("Failed to chdir(\"..\")"); |
91e93c71 AV |
1437 | return -1; |
1438 | } | |
1439 | ||
0fd73091 CB |
1440 | ret = chroot("."); |
1441 | if (ret < 0) { | |
8ce1abc2 | 1442 | SYSERROR("Failed to chroot(\".\")"); |
91e93c71 AV |
1443 | return -1; |
1444 | } | |
1445 | ||
1446 | return 0; | |
1447 | } | |
1448 | ||
8ce1abc2 CB |
1449 | /* (The following explanation is copied verbatim from the kernel.) |
1450 | * | |
1451 | * pivot_root Semantics: | |
1452 | * Moves the root file system of the current process to the directory put_old, | |
1453 | * makes new_root as the new root file system of the current process, and sets | |
1454 | * root/cwd of all processes which had them on the current root to new_root. | |
1455 | * | |
1456 | * Restrictions: | |
1457 | * The new_root and put_old must be directories, and must not be on the | |
1458 | * same file system as the current process root. The put_old must be | |
1459 | * underneath new_root, i.e. adding a non-zero number of /.. to the string | |
1460 | * pointed to by put_old must yield the same directory as new_root. No other | |
1461 | * file system may be mounted on put_old. After all, new_root is a mountpoint. | |
1462 | * | |
1463 | * Also, the current root cannot be on the 'rootfs' (initial ramfs) filesystem. | |
1464 | * See Documentation/filesystems/ramfs-rootfs-initramfs.txt for alternatives | |
1465 | * in this situation. | |
1466 | * | |
1467 | * Notes: | |
1468 | * - we don't move root/cwd if they are not at the root (reason: if something | |
1469 | * cared enough to change them, it's probably wrong to force them elsewhere) | |
1470 | * - it's okay to pick a root that isn't the root of a file system, e.g. | |
1471 | * /nfs/my_root where /nfs is the mount point. It must be a mountpoint, | |
1472 | * though, so you may need to say mount --bind /nfs/my_root /nfs/my_root | |
1473 | * first. | |
1474 | */ | |
1475 | static int lxc_pivot_root(const char *rootfs) | |
ac778708 | 1476 | { |
e2d0c21b CB |
1477 | int oldroot; |
1478 | int newroot = -1, ret = -1; | |
0fd73091 | 1479 | |
7806ebd7 | 1480 | oldroot = open("/", O_DIRECTORY | O_RDONLY | O_CLOEXEC); |
8ce1abc2 CB |
1481 | if (oldroot < 0) { |
1482 | SYSERROR("Failed to open old root directory"); | |
1483 | return -1; | |
39c7b795 | 1484 | } |
ac778708 | 1485 | |
7806ebd7 | 1486 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY | O_CLOEXEC); |
8ce1abc2 CB |
1487 | if (newroot < 0) { |
1488 | SYSERROR("Failed to open new root directory"); | |
1489 | goto on_error; | |
1490 | } | |
0fd73091 | 1491 | |
8ce1abc2 CB |
1492 | /* change into new root fs */ |
1493 | ret = fchdir(newroot); | |
1494 | if (ret < 0) { | |
1495 | ret = -1; | |
1496 | SYSERROR("Failed to change to new rootfs \"%s\"", rootfs); | |
1497 | goto on_error; | |
1498 | } | |
39c7b795 | 1499 | |
8ce1abc2 CB |
1500 | /* pivot_root into our new root fs */ |
1501 | ret = pivot_root(".", "."); | |
1502 | if (ret < 0) { | |
1503 | ret = -1; | |
1504 | SYSERROR("Failed to pivot_root()"); | |
1505 | goto on_error; | |
39c7b795 CB |
1506 | } |
1507 | ||
8ce1abc2 CB |
1508 | /* At this point the old-root is mounted on top of our new-root. To |
1509 | * unmounted it we must not be chdir'd into it, so escape back to | |
1510 | * old-root. | |
1511 | */ | |
1512 | ret = fchdir(oldroot); | |
0fd73091 | 1513 | if (ret < 0) { |
8ce1abc2 CB |
1514 | ret = -1; |
1515 | SYSERROR("Failed to enter old root directory"); | |
1516 | goto on_error; | |
c69bd12f DL |
1517 | } |
1518 | ||
8ce1abc2 CB |
1519 | /* Make oldroot rslave to make sure our umounts don't propagate to the |
1520 | * host. | |
1521 | */ | |
1522 | ret = mount("", ".", "", MS_SLAVE | MS_REC, NULL); | |
1523 | if (ret < 0) { | |
1524 | ret = -1; | |
1525 | SYSERROR("Failed to make oldroot rslave"); | |
1526 | goto on_error; | |
1527 | } | |
1528 | ||
1529 | ret = umount2(".", MNT_DETACH); | |
1530 | if (ret < 0) { | |
1531 | ret = -1; | |
1532 | SYSERROR("Failed to detach old root directory"); | |
1533 | goto on_error; | |
1534 | } | |
1535 | ||
1536 | ret = fchdir(newroot); | |
1537 | if (ret < 0) { | |
1538 | ret = -1; | |
1539 | SYSERROR("Failed to re-enter new root directory"); | |
1540 | goto on_error; | |
1541 | } | |
1542 | ||
1543 | ret = 0; | |
1544 | ||
1545 | TRACE("pivot_root(\"%s\") successful", rootfs); | |
1546 | ||
1547 | on_error: | |
e2d0c21b CB |
1548 | close(oldroot); |
1549 | ||
1550 | if (newroot >= 0) | |
8ce1abc2 CB |
1551 | close(newroot); |
1552 | ||
1553 | return ret; | |
0ad19a3f | 1554 | } |
1555 | ||
8ce1abc2 CB |
1556 | static int lxc_setup_rootfs_switch_root(const struct lxc_rootfs *rootfs) |
1557 | { | |
1558 | if (!rootfs->path) { | |
1559 | DEBUG("Container does not have a rootfs"); | |
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | if (detect_ramfs_rootfs()) | |
1564 | return lxc_chroot(rootfs); | |
1565 | ||
1566 | return lxc_pivot_root(rootfs->mount); | |
0ad19a3f | 1567 | } |
1568 | ||
8ce1abc2 CB |
1569 | static const struct id_map *find_mapped_nsid_entry(struct lxc_conf *conf, |
1570 | unsigned id, | |
1571 | enum idtype idtype) | |
f4900711 CB |
1572 | { |
1573 | struct lxc_list *it; | |
1574 | struct id_map *map; | |
1575 | struct id_map *retmap = NULL; | |
1576 | ||
dcf0ffdf CB |
1577 | /* Shortcut for container's root mappings. */ |
1578 | if (id == 0) { | |
1579 | if (idtype == ID_TYPE_UID) | |
1580 | return conf->root_nsuid_map; | |
1581 | ||
1582 | if (idtype == ID_TYPE_GID) | |
1583 | return conf->root_nsgid_map; | |
1584 | } | |
1585 | ||
f4900711 CB |
1586 | lxc_list_for_each(it, &conf->id_map) { |
1587 | map = it->elem; | |
1588 | if (map->idtype != idtype) | |
1589 | continue; | |
1590 | ||
1591 | if (id >= map->nsid && id < map->nsid + map->range) { | |
1592 | retmap = map; | |
1593 | break; | |
1594 | } | |
1595 | } | |
1596 | ||
1597 | return retmap; | |
1598 | } | |
1599 | ||
1600 | static int lxc_setup_devpts(struct lxc_conf *conf) | |
3c26f34e | 1601 | { |
70761e5e | 1602 | int ret; |
ce155c60 | 1603 | char **opts; |
9d28c4f9 | 1604 | char devpts_mntopts[256]; |
ce155c60 CB |
1605 | char *mntopt_sets[5]; |
1606 | char default_devpts_mntopts[256] = "gid=5,newinstance,ptmxmode=0666,mode=0620"; | |
77890c6d | 1607 | |
e528c735 | 1608 | if (conf->pty_max <= 0) { |
0fd73091 | 1609 | DEBUG("No new devpts instance will be mounted since no pts " |
70761e5e | 1610 | "devices are requested"); |
d852c78c | 1611 | return 0; |
3c26f34e | 1612 | } |
1613 | ||
e528c735 CB |
1614 | ret = snprintf(devpts_mntopts, sizeof(devpts_mntopts), "%s,max=%zu", |
1615 | default_devpts_mntopts, conf->pty_max); | |
9d28c4f9 CB |
1616 | if (ret < 0 || (size_t)ret >= sizeof(devpts_mntopts)) |
1617 | return -1; | |
1618 | ||
29a7b484 | 1619 | (void)umount2("/dev/pts", MNT_DETACH); |
7e40254a | 1620 | |
70761e5e CB |
1621 | /* Create mountpoint for devpts instance. */ |
1622 | ret = mkdir("/dev/pts", 0755); | |
1623 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1624 | SYSERROR("Failed to create \"/dev/pts\" directory"); |
3c26f34e | 1625 | return -1; |
1626 | } | |
1627 | ||
ce155c60 CB |
1628 | /* gid=5 && max= */ |
1629 | mntopt_sets[0] = devpts_mntopts; | |
dfbd4730 | 1630 | |
ce155c60 | 1631 | /* !gid=5 && max= */ |
6333c915 | 1632 | mntopt_sets[1] = devpts_mntopts + STRLITERALLEN("gid=5") + 1; |
ce155c60 CB |
1633 | |
1634 | /* gid=5 && !max= */ | |
1635 | mntopt_sets[2] = default_devpts_mntopts; | |
1636 | ||
1637 | /* !gid=5 && !max= */ | |
6333c915 | 1638 | mntopt_sets[3] = default_devpts_mntopts + STRLITERALLEN("gid=5") + 1; |
ce155c60 CB |
1639 | |
1640 | /* end */ | |
1641 | mntopt_sets[4] = NULL; | |
1642 | ||
1643 | for (ret = -1, opts = mntopt_sets; opts && *opts; opts++) { | |
1644 | /* mount new devpts instance */ | |
1645 | ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, *opts); | |
1646 | if (ret == 0) | |
1647 | break; | |
1648 | } | |
1649 | ||
1650 | if (ret < 0) { | |
1651 | SYSERROR("Failed to mount new devpts instance"); | |
1652 | return -1; | |
70761e5e | 1653 | } |
ce155c60 | 1654 | DEBUG("Mount new devpts instance with options \"%s\"", *opts); |
70761e5e | 1655 | |
d5cb35d6 | 1656 | /* Remove any pre-existing /dev/ptmx file. */ |
b29e05d6 CB |
1657 | ret = remove("/dev/ptmx"); |
1658 | if (ret < 0) { | |
1659 | if (errno != ENOENT) { | |
0fd73091 | 1660 | SYSERROR("Failed to remove existing \"/dev/ptmx\" file"); |
d5cb35d6 | 1661 | return -1; |
70761e5e | 1662 | } |
b29e05d6 | 1663 | } else { |
0fd73091 | 1664 | DEBUG("Removed existing \"/dev/ptmx\" file"); |
3c26f34e | 1665 | } |
1666 | ||
d5cb35d6 | 1667 | /* Create dummy /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
3b7e332f CB |
1668 | ret = mknod("/dev/ptmx", S_IFREG | 0000, 0); |
1669 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1670 | SYSERROR("Failed to create dummy \"/dev/ptmx\" file as bind mount target"); |
d5cb35d6 CB |
1671 | return -1; |
1672 | } | |
0fd73091 | 1673 | DEBUG("Created dummy \"/dev/ptmx\" file as bind mount target"); |
77890c6d | 1674 | |
d5cb35d6 | 1675 | /* Fallback option: create symlink /dev/ptmx -> /dev/pts/ptmx */ |
e87bd19c | 1676 | ret = mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL); |
d5cb35d6 | 1677 | if (!ret) { |
0fd73091 | 1678 | DEBUG("Bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1679 | return 0; |
1680 | } else { | |
1681 | /* Fallthrough and try to create a symlink. */ | |
0fd73091 | 1682 | ERROR("Failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); |
d5cb35d6 CB |
1683 | } |
1684 | ||
1685 | /* Remove the dummy /dev/ptmx file we created above. */ | |
1686 | ret = remove("/dev/ptmx"); | |
70761e5e | 1687 | if (ret < 0) { |
0fd73091 | 1688 | SYSERROR("Failed to remove existing \"/dev/ptmx\""); |
d5cb35d6 CB |
1689 | return -1; |
1690 | } | |
1691 | ||
1692 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
1693 | ret = symlink("/dev/pts/ptmx", "/dev/ptmx"); | |
1694 | if (ret < 0) { | |
0fd73091 | 1695 | SYSERROR("Failed to create symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
3c26f34e | 1696 | return -1; |
1697 | } | |
0fd73091 | 1698 | DEBUG("Created symlink from \"/dev/ptmx\" to \"/dev/pts/ptmx\""); |
cd54d859 | 1699 | |
3c26f34e | 1700 | return 0; |
1701 | } | |
1702 | ||
cccc74b5 DL |
1703 | static int setup_personality(int persona) |
1704 | { | |
0fd73091 CB |
1705 | int ret; |
1706 | ||
1707 | #if HAVE_SYS_PERSONALITY_H | |
cccc74b5 DL |
1708 | if (persona == -1) |
1709 | return 0; | |
1710 | ||
0fd73091 CB |
1711 | ret = personality(persona); |
1712 | if (ret < 0) { | |
1713 | SYSERROR("Failed to set personality to \"0x%x\"", persona); | |
cccc74b5 DL |
1714 | return -1; |
1715 | } | |
1716 | ||
0fd73091 CB |
1717 | INFO("Set personality to \"0x%x\"", persona); |
1718 | #endif | |
cccc74b5 DL |
1719 | |
1720 | return 0; | |
1721 | } | |
1722 | ||
3d7d929a | 1723 | static int lxc_setup_dev_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1724 | const struct lxc_terminal *console) |
6e590161 | 1725 | { |
882671aa | 1726 | int ret; |
6b5a54cd | 1727 | char path[PATH_MAX]; |
86530b0a | 1728 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
52e35957 | 1729 | |
8b1b1210 CB |
1730 | if (console->path && !strcmp(console->path, "none")) |
1731 | return 0; | |
1732 | ||
86530b0a | 1733 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3d7d929a | 1734 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1735 | return -1; |
52e35957 | 1736 | |
8b1b1210 CB |
1737 | /* When we are asked to setup a console we remove any previous |
1738 | * /dev/console bind-mounts. | |
1739 | */ | |
a7ba3c7f CB |
1740 | if (file_exists(path)) { |
1741 | ret = lxc_unstack_mountpoint(path, false); | |
1742 | if (ret < 0) { | |
6d1400b5 | 1743 | SYSERROR("Failed to unmount \"%s\"", path); |
a7ba3c7f CB |
1744 | return -ret; |
1745 | } else { | |
86530b0a | 1746 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1747 | } |
8b1b1210 CB |
1748 | } |
1749 | ||
1750 | /* For unprivileged containers autodev or automounts will already have | |
1751 | * taken care of creating /dev/console. | |
1752 | */ | |
882671aa | 1753 | ret = mknod(path, S_IFREG | 0000, 0); |
3b7e332f CB |
1754 | if (ret < 0 && errno != EEXIST) { |
1755 | SYSERROR("Failed to create console"); | |
1756 | return -errno; | |
52e35957 DL |
1757 | } |
1758 | ||
e581b9b5 | 1759 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP); |
86530b0a | 1760 | if (ret < 0) { |
0fd73091 | 1761 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
e581b9b5 | 1762 | S_IXUSR | S_IXGRP, console->name); |
3d7d929a | 1763 | return -errno; |
63376d7d | 1764 | } |
13954cce | 1765 | |
86530b0a L |
1766 | ret = safe_mount(console->name, path, "none", MS_BIND, 0, rootfs_path); |
1767 | if (ret < 0) { | |
0fd73091 | 1768 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, path); |
6e590161 | 1769 | return -1; |
1770 | } | |
1771 | ||
86530b0a | 1772 | DEBUG("Mounted pts device \"%s\" onto \"%s\"", console->name, path); |
7c6ef2a2 SH |
1773 | return 0; |
1774 | } | |
1775 | ||
3d7d929a | 1776 | static int lxc_setup_ttydir_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1777 | const struct lxc_terminal *console, |
3d7d929a | 1778 | char *ttydir) |
7c6ef2a2 | 1779 | { |
3b7e332f | 1780 | int ret; |
6b5a54cd | 1781 | char path[PATH_MAX], lxcpath[PATH_MAX]; |
86530b0a | 1782 | char *rootfs_path = rootfs->path ? rootfs->mount : ""; |
7c6ef2a2 | 1783 | |
3dc035f1 L |
1784 | if (console->path && !strcmp(console->path, "none")) |
1785 | return 0; | |
1786 | ||
7c6ef2a2 | 1787 | /* create rootfs/dev/<ttydir> directory */ |
86530b0a | 1788 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs_path, ttydir); |
3d7d929a | 1789 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1790 | return -1; |
3d7d929a | 1791 | |
7c6ef2a2 SH |
1792 | ret = mkdir(path, 0755); |
1793 | if (ret && errno != EEXIST) { | |
0fd73091 | 1794 | SYSERROR("Failed to create \"%s\"", path); |
3d7d929a | 1795 | return -errno; |
7c6ef2a2 | 1796 | } |
4742cd9a | 1797 | DEBUG("Created directory for console and tty devices at \"%s\"", path); |
7c6ef2a2 | 1798 | |
86530b0a | 1799 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", rootfs_path, ttydir); |
3d7d929a CB |
1800 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
1801 | return -1; | |
1802 | ||
3b7e332f CB |
1803 | ret = mknod(lxcpath, S_IFREG | 0000, 0); |
1804 | if (ret < 0 && errno != EEXIST) { | |
0fd73091 | 1805 | SYSERROR("Failed to create \"%s\"", lxcpath); |
3d7d929a | 1806 | return -errno; |
7c6ef2a2 | 1807 | } |
7c6ef2a2 | 1808 | |
86530b0a | 1809 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs_path); |
3dc035f1 | 1810 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1811 | return -1; |
2a12fefd | 1812 | |
3dc035f1 | 1813 | if (file_exists(path)) { |
a7ba3c7f | 1814 | ret = lxc_unstack_mountpoint(path, false); |
2a12fefd | 1815 | if (ret < 0) { |
6d1400b5 | 1816 | SYSERROR("Failed to unmount \"%s\"", path); |
a7ba3c7f CB |
1817 | return -ret; |
1818 | } else { | |
86530b0a | 1819 | DEBUG("Cleared all (%d) mounts from \"%s\"", ret, path); |
a7ba3c7f | 1820 | } |
3dc035f1 | 1821 | } |
2a12fefd | 1822 | |
3b7e332f CB |
1823 | ret = mknod(path, S_IFREG | 0000, 0); |
1824 | if (ret < 0 && errno != EEXIST) { | |
1825 | SYSERROR("Failed to create console"); | |
1826 | return -errno; | |
7c6ef2a2 SH |
1827 | } |
1828 | ||
e581b9b5 | 1829 | ret = fchmod(console->slave, S_IXUSR | S_IXGRP); |
86530b0a | 1830 | if (ret < 0) { |
0fd73091 | 1831 | SYSERROR("Failed to set mode \"0%o\" to \"%s\"", |
e581b9b5 | 1832 | S_IXUSR | S_IXGRP, console->name); |
2a12fefd CB |
1833 | return -errno; |
1834 | } | |
1835 | ||
3dc035f1 | 1836 | /* bind mount console->name to '/dev/<ttydir>/console' */ |
86530b0a L |
1837 | ret = safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs_path); |
1838 | if (ret < 0) { | |
0fd73091 | 1839 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
7c6ef2a2 SH |
1840 | return -1; |
1841 | } | |
86530b0a | 1842 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1843 | |
1844 | /* bind mount '/dev/<ttydir>/console' to '/dev/console' */ | |
86530b0a L |
1845 | ret = safe_mount(lxcpath, path, "none", MS_BIND, 0, rootfs_path); |
1846 | if (ret < 0) { | |
0fd73091 | 1847 | ERROR("Failed to mount \"%s\" on \"%s\"", console->name, lxcpath); |
3dc035f1 L |
1848 | return -1; |
1849 | } | |
86530b0a | 1850 | DEBUG("Mounted \"%s\" onto \"%s\"", console->name, lxcpath); |
3dc035f1 | 1851 | |
86530b0a | 1852 | DEBUG("Console has been setup under \"%s\" and mounted to \"%s\"", lxcpath, path); |
6e590161 | 1853 | return 0; |
1854 | } | |
1855 | ||
3d7d929a | 1856 | static int lxc_setup_console(const struct lxc_rootfs *rootfs, |
dcad02f8 | 1857 | const struct lxc_terminal *console, char *ttydir) |
7c6ef2a2 | 1858 | { |
3d7d929a | 1859 | |
7c6ef2a2 | 1860 | if (!ttydir) |
3d7d929a | 1861 | return lxc_setup_dev_console(rootfs, console); |
7c6ef2a2 | 1862 | |
3d7d929a | 1863 | return lxc_setup_ttydir_console(rootfs, console, ttydir); |
7c6ef2a2 SH |
1864 | } |
1865 | ||
efed99a4 | 1866 | static void parse_mntopt(char *opt, unsigned long *flags, char **data, size_t size) |
998ac676 RT |
1867 | { |
1868 | struct mount_opt *mo; | |
1869 | ||
1870 | /* If opt is found in mount_opt, set or clear flags. | |
1871 | * Otherwise append it to data. */ | |
1872 | ||
1873 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
0fd73091 | 1874 | if (strncmp(opt, mo->name, strlen(mo->name)) == 0) { |
998ac676 RT |
1875 | if (mo->clear) |
1876 | *flags &= ~mo->flag; | |
1877 | else | |
1878 | *flags |= mo->flag; | |
1879 | return; | |
1880 | } | |
1881 | } | |
1882 | ||
f1e05b90 DJ |
1883 | if (strlen(*data)) |
1884 | (void)strlcat(*data, ",", size); | |
efed99a4 | 1885 | |
f1e05b90 | 1886 | (void)strlcat(*data, opt, size); |
998ac676 RT |
1887 | } |
1888 | ||
0fd73091 | 1889 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, char **mntdata) |
998ac676 | 1890 | { |
a71f619c CB |
1891 | __do_free char *data = NULL, *s = NULL; |
1892 | char *p; | |
efed99a4 | 1893 | size_t size; |
998ac676 | 1894 | |
911324ef | 1895 | *mntdata = NULL; |
91656ce5 | 1896 | *mntflags = 0L; |
911324ef DL |
1897 | |
1898 | if (!mntopts) | |
998ac676 RT |
1899 | return 0; |
1900 | ||
911324ef | 1901 | s = strdup(mntopts); |
0fd73091 | 1902 | if (!s) |
998ac676 | 1903 | return -1; |
998ac676 | 1904 | |
efed99a4 DJ |
1905 | size = strlen(s) + 1; |
1906 | data = malloc(size); | |
a71f619c | 1907 | if (!data) |
998ac676 | 1908 | return -1; |
998ac676 RT |
1909 | *data = 0; |
1910 | ||
8db9d26f | 1911 | lxc_iterate_parts(p, s, ",") |
efed99a4 | 1912 | parse_mntopt(p, mntflags, &data, size); |
998ac676 RT |
1913 | |
1914 | if (*data) | |
a71f619c | 1915 | *mntdata = move_ptr(data); |
998ac676 RT |
1916 | |
1917 | return 0; | |
1918 | } | |
1919 | ||
d840039e YT |
1920 | static void parse_propagationopt(char *opt, unsigned long *flags) |
1921 | { | |
1922 | struct mount_opt *mo; | |
1923 | ||
1924 | /* If opt is found in propagation_opt, set or clear flags. */ | |
d840039e | 1925 | for (mo = &propagation_opt[0]; mo->name != NULL; mo++) { |
0fd73091 CB |
1926 | if (strncmp(opt, mo->name, strlen(mo->name)) != 0) |
1927 | continue; | |
1928 | ||
1929 | if (mo->clear) | |
1930 | *flags &= ~mo->flag; | |
1931 | else | |
1932 | *flags |= mo->flag; | |
1933 | ||
1934 | return; | |
d840039e YT |
1935 | } |
1936 | } | |
1937 | ||
8ce1abc2 | 1938 | int parse_propagationopts(const char *mntopts, unsigned long *pflags) |
d840039e | 1939 | { |
dfd2e059 CB |
1940 | __do_free char *s = NULL; |
1941 | char *p; | |
d840039e YT |
1942 | |
1943 | if (!mntopts) | |
1944 | return 0; | |
1945 | ||
1946 | s = strdup(mntopts); | |
1947 | if (!s) { | |
1948 | SYSERROR("Failed to allocate memory"); | |
1949 | return -ENOMEM; | |
1950 | } | |
1951 | ||
0fd73091 | 1952 | *pflags = 0L; |
8db9d26f | 1953 | lxc_iterate_parts(p, s, ",") |
d840039e | 1954 | parse_propagationopt(p, pflags); |
0fd73091 | 1955 | |
d840039e YT |
1956 | return 0; |
1957 | } | |
1958 | ||
6fd5e769 SH |
1959 | static void null_endofword(char *word) |
1960 | { | |
1961 | while (*word && *word != ' ' && *word != '\t') | |
1962 | word++; | |
1963 | *word = '\0'; | |
1964 | } | |
1965 | ||
0fd73091 | 1966 | /* skip @nfields spaces in @src */ |
6fd5e769 SH |
1967 | static char *get_field(char *src, int nfields) |
1968 | { | |
6fd5e769 | 1969 | int i; |
0fd73091 | 1970 | char *p = src; |
6fd5e769 SH |
1971 | |
1972 | for (i = 0; i < nfields; i++) { | |
1973 | while (*p && *p != ' ' && *p != '\t') | |
1974 | p++; | |
0fd73091 | 1975 | |
6fd5e769 SH |
1976 | if (!*p) |
1977 | break; | |
0fd73091 | 1978 | |
6fd5e769 SH |
1979 | p++; |
1980 | } | |
0fd73091 | 1981 | |
6fd5e769 SH |
1982 | return p; |
1983 | } | |
1984 | ||
911324ef DL |
1985 | static int mount_entry(const char *fsname, const char *target, |
1986 | const char *fstype, unsigned long mountflags, | |
d840039e YT |
1987 | unsigned long pflags, const char *data, bool optional, |
1988 | bool dev, bool relative, const char *rootfs) | |
911324ef | 1989 | { |
0ac4b28a | 1990 | int ret; |
6b5a54cd | 1991 | char srcbuf[PATH_MAX]; |
181437fd | 1992 | const char *srcpath = fsname; |
614305f3 | 1993 | #ifdef HAVE_STATVFS |
2938f7c8 | 1994 | struct statvfs sb; |
614305f3 | 1995 | #endif |
2938f7c8 | 1996 | |
181437fd | 1997 | if (relative) { |
6b5a54cd CB |
1998 | ret = snprintf(srcbuf, PATH_MAX, "%s/%s", rootfs ? rootfs : "/", fsname ? fsname : ""); |
1999 | if (ret < 0 || ret >= PATH_MAX) { | |
181437fd YT |
2000 | ERROR("source path is too long"); |
2001 | return -1; | |
2002 | } | |
2003 | srcpath = srcbuf; | |
2004 | } | |
2005 | ||
2006 | ret = safe_mount(srcpath, target, fstype, mountflags & ~MS_REMOUNT, data, | |
0ac4b28a CB |
2007 | rootfs); |
2008 | if (ret < 0) { | |
1fc64d22 | 2009 | if (optional) { |
7874d81a | 2010 | SYSINFO("Failed to mount \"%s\" on \"%s\" (optional)", |
2011 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
2012 | return 0; |
2013 | } | |
0ac4b28a | 2014 | |
0103eb53 | 2015 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2016 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2017 | return -1; |
911324ef DL |
2018 | } |
2019 | ||
2020 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
7c5b6e7c | 2021 | unsigned long rqd_flags = 0; |
0ac4b28a CB |
2022 | |
2023 | DEBUG("Remounting \"%s\" on \"%s\" to respect bind or remount " | |
181437fd | 2024 | "options", srcpath ? srcpath : "(none)", target ? target : "(none)"); |
0ac4b28a | 2025 | |
7c5b6e7c AS |
2026 | if (mountflags & MS_RDONLY) |
2027 | rqd_flags |= MS_RDONLY; | |
614305f3 | 2028 | #ifdef HAVE_STATVFS |
181437fd | 2029 | if (srcpath && statvfs(srcpath, &sb) == 0) { |
7c5b6e7c | 2030 | unsigned long required_flags = rqd_flags; |
0ac4b28a | 2031 | |
2938f7c8 SH |
2032 | if (sb.f_flag & MS_NOSUID) |
2033 | required_flags |= MS_NOSUID; | |
0ac4b28a | 2034 | |
ae7a770e | 2035 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 | 2036 | required_flags |= MS_NODEV; |
0ac4b28a | 2037 | |
2938f7c8 SH |
2038 | if (sb.f_flag & MS_RDONLY) |
2039 | required_flags |= MS_RDONLY; | |
0ac4b28a | 2040 | |
2938f7c8 SH |
2041 | if (sb.f_flag & MS_NOEXEC) |
2042 | required_flags |= MS_NOEXEC; | |
0ac4b28a CB |
2043 | |
2044 | DEBUG("Flags for \"%s\" were %lu, required extra flags " | |
181437fd | 2045 | "are %lu", srcpath, sb.f_flag, required_flags); |
0ac4b28a CB |
2046 | |
2047 | /* If this was a bind mount request, and required_flags | |
2938f7c8 | 2048 | * does not have any flags which are not already in |
0ac4b28a | 2049 | * mountflags, then skip the remount. |
2938f7c8 SH |
2050 | */ |
2051 | if (!(mountflags & MS_REMOUNT)) { | |
0ac4b28a CB |
2052 | if (!(required_flags & ~mountflags) && |
2053 | rqd_flags == 0) { | |
2054 | DEBUG("Mountflags already were %lu, " | |
2055 | "skipping remount", mountflags); | |
2938f7c8 SH |
2056 | goto skipremount; |
2057 | } | |
2058 | } | |
0ac4b28a | 2059 | |
2938f7c8 | 2060 | mountflags |= required_flags; |
6fd5e769 | 2061 | } |
614305f3 | 2062 | #endif |
911324ef | 2063 | |
181437fd | 2064 | ret = mount(srcpath, target, fstype, mountflags | MS_REMOUNT, data); |
0ac4b28a | 2065 | if (ret < 0) { |
1fc64d22 | 2066 | if (optional) { |
7874d81a | 2067 | SYSINFO("Failed to mount \"%s\" on \"%s\" (optional)", |
2068 | srcpath ? srcpath : "(null)", target); | |
1fc64d22 SG |
2069 | return 0; |
2070 | } | |
0ac4b28a | 2071 | |
0103eb53 | 2072 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 2073 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 2074 | return -1; |
911324ef DL |
2075 | } |
2076 | } | |
2077 | ||
a3ed9b81 | 2078 | #ifdef HAVE_STATVFS |
2079 | skipremount: | |
2080 | #endif | |
d840039e YT |
2081 | if (pflags) { |
2082 | ret = mount(NULL, target, NULL, pflags, NULL); | |
2083 | if (ret < 0) { | |
2084 | if (optional) { | |
7874d81a | 2085 | SYSINFO("Failed to change mount propagation " |
2086 | "for \"%s\" (optional)", target); | |
d840039e YT |
2087 | return 0; |
2088 | } else { | |
2089 | SYSERROR("Failed to change mount propagation " | |
2090 | "for \"%s\" (optional)", target); | |
2091 | return -1; | |
2092 | } | |
2093 | } | |
2094 | DEBUG("Changed mount propagation for \"%s\"", target); | |
2095 | } | |
2096 | ||
0103eb53 | 2097 | DEBUG("Mounted \"%s\" on \"%s\" with filesystem type \"%s\"", |
181437fd | 2098 | srcpath ? srcpath : "(null)", target, fstype); |
911324ef DL |
2099 | |
2100 | return 0; | |
2101 | } | |
2102 | ||
c5e30de4 | 2103 | /* Remove "optional", "create=dir", and "create=file" from mntopt */ |
4e4ca161 SH |
2104 | static void cull_mntent_opt(struct mntent *mntent) |
2105 | { | |
2106 | int i; | |
0fd73091 CB |
2107 | char *list[] = { |
2108 | "create=dir", | |
2109 | "create=file", | |
2110 | "optional", | |
2111 | "relative", | |
2112 | NULL | |
2113 | }; | |
c5e30de4 CB |
2114 | |
2115 | for (i = 0; list[i]; i++) { | |
2116 | char *p, *p2; | |
2117 | ||
2118 | p = strstr(mntent->mnt_opts, list[i]); | |
2119 | if (!p) | |
4e4ca161 | 2120 | continue; |
c5e30de4 | 2121 | |
4e4ca161 SH |
2122 | p2 = strchr(p, ','); |
2123 | if (!p2) { | |
2124 | /* no more mntopts, so just chop it here */ | |
2125 | *p = '\0'; | |
2126 | continue; | |
2127 | } | |
c5e30de4 CB |
2128 | |
2129 | memmove(p, p2 + 1, strlen(p2 + 1) + 1); | |
4e4ca161 SH |
2130 | } |
2131 | } | |
2132 | ||
4d5b72a1 | 2133 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
749f98d9 CB |
2134 | const char *path, |
2135 | const struct lxc_rootfs *rootfs, | |
0fd73091 | 2136 | const char *lxc_name, const char *lxc_path) |
0ad19a3f | 2137 | { |
7a76eeaa | 2138 | __do_free char *p1 = NULL; |
3b7e332f | 2139 | int ret; |
7a76eeaa | 2140 | char *p2; |
911324ef | 2141 | |
12e6ab5d | 2142 | if (strncmp(mntent->mnt_type, "overlay", 7) == 0) { |
749f98d9 | 2143 | ret = ovl_mkdir(mntent, rootfs, lxc_name, lxc_path); |
12e6ab5d CB |
2144 | if (ret < 0) |
2145 | return -1; | |
2146 | } | |
6e46cc0d | 2147 | |
34cfffb3 | 2148 | if (hasmntopt(mntent, "create=dir")) { |
749f98d9 CB |
2149 | ret = mkdir_p(path, 0755); |
2150 | if (ret < 0 && errno != EEXIST) { | |
2151 | SYSERROR("Failed to create directory \"%s\"", path); | |
2152 | return -1; | |
34cfffb3 SG |
2153 | } |
2154 | } | |
2155 | ||
0fd73091 CB |
2156 | if (!hasmntopt(mntent, "create=file")) |
2157 | return 0; | |
749f98d9 | 2158 | |
0fd73091 CB |
2159 | ret = access(path, F_OK); |
2160 | if (ret == 0) | |
2161 | return 0; | |
749f98d9 | 2162 | |
0fd73091 CB |
2163 | p1 = strdup(path); |
2164 | if (!p1) | |
2165 | return -1; | |
749f98d9 | 2166 | |
0fd73091 | 2167 | p2 = dirname(p1); |
749f98d9 | 2168 | |
0fd73091 | 2169 | ret = mkdir_p(p2, 0755); |
0fd73091 CB |
2170 | if (ret < 0 && errno != EEXIST) { |
2171 | SYSERROR("Failed to create directory \"%s\"", path); | |
2172 | return -1; | |
34cfffb3 | 2173 | } |
749f98d9 | 2174 | |
3b7e332f CB |
2175 | ret = mknod(path, S_IFREG | 0000, 0); |
2176 | if (ret < 0 && errno != EEXIST) | |
2177 | return -errno; | |
0fd73091 | 2178 | |
749f98d9 | 2179 | return 0; |
4d5b72a1 NC |
2180 | } |
2181 | ||
ec50007f CB |
2182 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
2183 | * without a rootfs. */ | |
db4aba38 | 2184 | static inline int mount_entry_on_generic(struct mntent *mntent, |
d8b712bc CB |
2185 | const char *path, |
2186 | const struct lxc_rootfs *rootfs, | |
2187 | const char *lxc_name, | |
2188 | const char *lxc_path) | |
4d5b72a1 | 2189 | { |
fd214f37 | 2190 | __do_free char *mntdata = NULL; |
d8b712bc | 2191 | int ret; |
949d0338 | 2192 | unsigned long mntflags; |
181437fd | 2193 | bool dev, optional, relative; |
949d0338 | 2194 | unsigned long pflags = 0; |
ec50007f | 2195 | char *rootfs_path = NULL; |
d8b712bc CB |
2196 | |
2197 | optional = hasmntopt(mntent, "optional") != NULL; | |
2198 | dev = hasmntopt(mntent, "dev") != NULL; | |
181437fd | 2199 | relative = hasmntopt(mntent, "relative") != NULL; |
d8b712bc | 2200 | |
ec50007f CB |
2201 | if (rootfs && rootfs->path) |
2202 | rootfs_path = rootfs->mount; | |
2203 | ||
d8b712bc CB |
2204 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, |
2205 | lxc_path); | |
2206 | if (ret < 0) { | |
2207 | if (optional) | |
2208 | return 0; | |
608e3567 | 2209 | |
d8b712bc CB |
2210 | return -1; |
2211 | } | |
4e4ca161 SH |
2212 | cull_mntent_opt(mntent); |
2213 | ||
d840039e YT |
2214 | ret = parse_propagationopts(mntent->mnt_opts, &pflags); |
2215 | if (ret < 0) | |
2216 | return -1; | |
2217 | ||
d8b712bc CB |
2218 | ret = parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata); |
2219 | if (ret < 0) | |
a17b1e65 | 2220 | return -1; |
a17b1e65 | 2221 | |
6e46cc0d | 2222 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
d840039e | 2223 | pflags, mntdata, optional, dev, relative, rootfs_path); |
68c152ef | 2224 | |
911324ef DL |
2225 | return ret; |
2226 | } | |
2227 | ||
db4aba38 NC |
2228 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
2229 | { | |
1433c9f9 | 2230 | int ret; |
6b5a54cd | 2231 | char path[PATH_MAX]; |
1433c9f9 CB |
2232 | |
2233 | /* For containers created without a rootfs all mounts are treated as | |
07667a6a CB |
2234 | * absolute paths starting at / on the host. |
2235 | */ | |
1433c9f9 CB |
2236 | if (mntent->mnt_dir[0] != '/') |
2237 | ret = snprintf(path, sizeof(path), "/%s", mntent->mnt_dir); | |
2238 | else | |
2239 | ret = snprintf(path, sizeof(path), "%s", mntent->mnt_dir); | |
07667a6a | 2240 | if (ret < 0 || ret >= sizeof(path)) |
1433c9f9 | 2241 | return -1; |
1433c9f9 CB |
2242 | |
2243 | return mount_entry_on_generic(mntent, path, NULL, NULL, NULL); | |
db4aba38 NC |
2244 | } |
2245 | ||
4e4ca161 | 2246 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 | 2247 | const struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2248 | const char *lxc_name, |
2249 | const char *lxc_path) | |
911324ef | 2250 | { |
bdd2b34c | 2251 | int offset; |
013bd428 | 2252 | char *aux; |
67e571de | 2253 | const char *lxcpath; |
6b5a54cd | 2254 | char path[PATH_MAX]; |
bdd2b34c | 2255 | int ret = 0; |
0ad19a3f | 2256 | |
593e8478 | 2257 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
bdd2b34c | 2258 | if (!lxcpath) |
2a59a681 | 2259 | return -1; |
2a59a681 | 2260 | |
bdd2b34c CB |
2261 | /* If rootfs->path is a blockdev path, allow container fstab to use |
2262 | * <lxcpath>/<name>/rootfs" as the target prefix. | |
2263 | */ | |
6b5a54cd CB |
2264 | ret = snprintf(path, PATH_MAX, "%s/%s/rootfs", lxcpath, lxc_name); |
2265 | if (ret < 0 || ret >= PATH_MAX) | |
80a881b2 SH |
2266 | goto skipvarlib; |
2267 | ||
2268 | aux = strstr(mntent->mnt_dir, path); | |
2269 | if (aux) { | |
2270 | offset = strlen(path); | |
2271 | goto skipabs; | |
2272 | } | |
2273 | ||
2274 | skipvarlib: | |
013bd428 DL |
2275 | aux = strstr(mntent->mnt_dir, rootfs->path); |
2276 | if (!aux) { | |
bdd2b34c | 2277 | WARN("Ignoring mount point \"%s\"", mntent->mnt_dir); |
db4aba38 | 2278 | return ret; |
013bd428 | 2279 | } |
80a881b2 SH |
2280 | offset = strlen(rootfs->path); |
2281 | ||
2282 | skipabs: | |
6b5a54cd CB |
2283 | ret = snprintf(path, PATH_MAX, "%s/%s", rootfs->mount, aux + offset); |
2284 | if (ret < 0 || ret >= PATH_MAX) | |
a17b1e65 | 2285 | return -1; |
a17b1e65 | 2286 | |
0a2dddd4 | 2287 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef | 2288 | } |
d330fe7b | 2289 | |
4e4ca161 | 2290 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
0a2dddd4 CB |
2291 | const struct lxc_rootfs *rootfs, |
2292 | const char *lxc_name, | |
2293 | const char *lxc_path) | |
911324ef | 2294 | { |
911324ef | 2295 | int ret; |
6b5a54cd | 2296 | char path[PATH_MAX]; |
d330fe7b | 2297 | |
34cfffb3 | 2298 | /* relative to root mount point */ |
6e46cc0d | 2299 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs->mount, mntent->mnt_dir); |
0fd73091 | 2300 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
9ba8130c | 2301 | return -1; |
911324ef | 2302 | |
0a2dddd4 | 2303 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef DL |
2304 | } |
2305 | ||
06749971 CB |
2306 | static int mount_file_entries(const struct lxc_conf *conf, |
2307 | const struct lxc_rootfs *rootfs, FILE *file, | |
1ae3c19f | 2308 | const char *lxc_name, const char *lxc_path) |
911324ef | 2309 | { |
9d03d857 | 2310 | char buf[PATH_MAX]; |
0fd73091 | 2311 | struct mntent mntent; |
e76b8764 | 2312 | |
aaf901be | 2313 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
9d03d857 CB |
2314 | int ret; |
2315 | ||
1ae3c19f CB |
2316 | if (!rootfs->path) |
2317 | ret = mount_entry_on_systemfs(&mntent); | |
2318 | else if (mntent.mnt_dir[0] != '/') | |
2319 | ret = mount_entry_on_relative_rootfs(&mntent, rootfs, | |
2320 | lxc_name, lxc_path); | |
2321 | else | |
2322 | ret = mount_entry_on_absolute_rootfs(&mntent, rootfs, | |
9d03d857 | 2323 | lxc_name, lxc_path); |
1ae3c19f CB |
2324 | if (ret < 0) |
2325 | return -1; | |
0ad19a3f | 2326 | } |
cd54d859 | 2327 | |
9d03d857 CB |
2328 | if (!feof(file) || ferror(file)) { |
2329 | ERROR("Failed to parse mount entries"); | |
2330 | return -1; | |
2331 | } | |
2332 | ||
2333 | return 0; | |
e7938e9e MN |
2334 | } |
2335 | ||
06749971 CB |
2336 | static int setup_mount(const struct lxc_conf *conf, |
2337 | const struct lxc_rootfs *rootfs, const char *fstab, | |
42dff448 | 2338 | const char *lxc_name, const char *lxc_path) |
e7938e9e | 2339 | { |
42dff448 | 2340 | FILE *f; |
e7938e9e MN |
2341 | int ret; |
2342 | ||
2343 | if (!fstab) | |
2344 | return 0; | |
2345 | ||
42dff448 CB |
2346 | f = setmntent(fstab, "r"); |
2347 | if (!f) { | |
2348 | SYSERROR("Failed to open \"%s\"", fstab); | |
e7938e9e MN |
2349 | return -1; |
2350 | } | |
2351 | ||
06749971 | 2352 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
42dff448 CB |
2353 | if (ret < 0) |
2354 | ERROR("Failed to set up mount entries"); | |
e7938e9e | 2355 | |
42dff448 | 2356 | endmntent(f); |
0ad19a3f | 2357 | return ret; |
2358 | } | |
2359 | ||
1800f924 WB |
2360 | /* |
2361 | * In order for nested containers to be able to mount /proc and /sys they need | |
2362 | * to see a "pure" proc and sysfs mount points with nothing mounted on top | |
2363 | * (like lxcfs). | |
2364 | * For this we provide proc and sysfs in /dev/.lxc/{proc,sys} while using an | |
2365 | * apparmor rule to deny access to them. This is mostly for convenience: The | |
2366 | * container's root user can mount them anyway and thus has access to the two | |
2367 | * file systems. But a non-root user in the container should not be allowed to | |
2368 | * access them as a side effect without explicitly allowing it. | |
2369 | */ | |
2370 | static const char nesting_helpers[] = | |
dc691e34 CB |
2371 | "proc dev/.lxc/proc proc create=dir,optional 0 0\n" |
2372 | "sys dev/.lxc/sys sysfs create=dir,optional 0 0\n"; | |
1800f924 WB |
2373 | |
2374 | FILE *make_anonymous_mount_file(struct lxc_list *mount, | |
2375 | bool include_nesting_helpers) | |
e7938e9e | 2376 | { |
5ef5c9a3 | 2377 | int ret; |
e7938e9e | 2378 | char *mount_entry; |
5ef5c9a3 | 2379 | struct lxc_list *iterator; |
5ef5c9a3 CB |
2380 | int fd = -1; |
2381 | ||
0fd73091 | 2382 | fd = memfd_create(".lxc_mount_file", MFD_CLOEXEC); |
5ef5c9a3 | 2383 | if (fd < 0) { |
a324e7eb CB |
2384 | char template[] = P_tmpdir "/.lxc_mount_file_XXXXXX"; |
2385 | ||
5ef5c9a3 CB |
2386 | if (errno != ENOSYS) |
2387 | return NULL; | |
a324e7eb CB |
2388 | |
2389 | fd = lxc_make_tmpfile(template, true); | |
0fd73091 CB |
2390 | if (fd < 0) { |
2391 | SYSERROR("Could not create temporary mount file"); | |
2392 | return NULL; | |
2393 | } | |
2394 | ||
6bd04140 | 2395 | TRACE("Created temporary mount file"); |
5ef5c9a3 | 2396 | } |
e7938e9e | 2397 | |
0fd73091 CB |
2398 | lxc_list_for_each (iterator, mount) { |
2399 | size_t len; | |
2400 | ||
e7938e9e | 2401 | mount_entry = iterator->elem; |
0fd73091 | 2402 | len = strlen(mount_entry); |
5ef5c9a3 | 2403 | |
489f39be | 2404 | ret = lxc_write_nointr(fd, mount_entry, len); |
0fd73091 CB |
2405 | if (ret != len) |
2406 | goto on_error; | |
2407 | ||
489f39be | 2408 | ret = lxc_write_nointr(fd, "\n", 1); |
0fd73091 CB |
2409 | if (ret != 1) |
2410 | goto on_error; | |
e7938e9e MN |
2411 | } |
2412 | ||
1800f924 WB |
2413 | if (include_nesting_helpers) { |
2414 | ret = lxc_write_nointr(fd, nesting_helpers, | |
6333c915 CB |
2415 | STRARRAYLEN(nesting_helpers)); |
2416 | if (ret != STRARRAYLEN(nesting_helpers)) | |
1800f924 WB |
2417 | goto on_error; |
2418 | } | |
2419 | ||
0fd73091 CB |
2420 | ret = lseek(fd, 0, SEEK_SET); |
2421 | if (ret < 0) | |
2422 | goto on_error; | |
2423 | ||
2424 | return fdopen(fd, "r+"); | |
2425 | ||
2426 | on_error: | |
2427 | SYSERROR("Failed to write mount entry to temporary mount file"); | |
2428 | close(fd); | |
2429 | return NULL; | |
9fc7f8c0 TA |
2430 | } |
2431 | ||
06749971 CB |
2432 | static int setup_mount_entries(const struct lxc_conf *conf, |
2433 | const struct lxc_rootfs *rootfs, | |
5ef5c9a3 CB |
2434 | struct lxc_list *mount, const char *lxc_name, |
2435 | const char *lxc_path) | |
9fc7f8c0 | 2436 | { |
9fc7f8c0 | 2437 | int ret; |
0fd73091 | 2438 | FILE *f; |
9fc7f8c0 | 2439 | |
1800f924 | 2440 | f = make_anonymous_mount_file(mount, conf->lsm_aa_allow_nesting); |
19b5d755 | 2441 | if (!f) |
9fc7f8c0 | 2442 | return -1; |
e7938e9e | 2443 | |
06749971 | 2444 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
19b5d755 | 2445 | fclose(f); |
0fd73091 | 2446 | |
e7938e9e MN |
2447 | return ret; |
2448 | } | |
2449 | ||
bab88e68 CS |
2450 | static int parse_cap(const char *cap) |
2451 | { | |
84760c11 | 2452 | size_t i; |
2453 | int capid = -1; | |
0fd73091 CB |
2454 | size_t end = sizeof(caps_opt) / sizeof(caps_opt[0]); |
2455 | char *ptr = NULL; | |
bab88e68 | 2456 | |
0fd73091 | 2457 | if (strcmp(cap, "none") == 0) |
7035407c DE |
2458 | return -2; |
2459 | ||
8560cd36 | 2460 | for (i = 0; i < end; i++) { |
bab88e68 CS |
2461 | if (strcmp(cap, caps_opt[i].name)) |
2462 | continue; | |
2463 | ||
2464 | capid = caps_opt[i].value; | |
2465 | break; | |
2466 | } | |
2467 | ||
2468 | if (capid < 0) { | |
0fd73091 CB |
2469 | /* Try to see if it's numeric, so the user may specify |
2470 | * capabilities that the running kernel knows about but we | |
2471 | * don't | |
2472 | */ | |
bab88e68 CS |
2473 | errno = 0; |
2474 | capid = strtol(cap, &ptr, 10); | |
2475 | if (!ptr || *ptr != '\0' || errno != 0) | |
2476 | /* not a valid number */ | |
2477 | capid = -1; | |
2478 | else if (capid > lxc_caps_last_cap()) | |
2479 | /* we have a number but it's not a valid | |
2480 | * capability */ | |
2481 | capid = -1; | |
2482 | } | |
2483 | ||
2484 | return capid; | |
2485 | } | |
2486 | ||
0769b82a CS |
2487 | int in_caplist(int cap, struct lxc_list *caps) |
2488 | { | |
0769b82a | 2489 | int capid; |
0fd73091 | 2490 | struct lxc_list *iterator; |
0769b82a | 2491 | |
0fd73091 | 2492 | lxc_list_for_each (iterator, caps) { |
0769b82a CS |
2493 | capid = parse_cap(iterator->elem); |
2494 | if (capid == cap) | |
2495 | return 1; | |
2496 | } | |
2497 | ||
2498 | return 0; | |
2499 | } | |
2500 | ||
81810dd1 DL |
2501 | static int setup_caps(struct lxc_list *caps) |
2502 | { | |
bab88e68 | 2503 | int capid; |
0fd73091 CB |
2504 | char *drop_entry; |
2505 | struct lxc_list *iterator; | |
81810dd1 | 2506 | |
0fd73091 CB |
2507 | lxc_list_for_each (iterator, caps) { |
2508 | int ret; | |
81810dd1 DL |
2509 | |
2510 | drop_entry = iterator->elem; | |
2511 | ||
bab88e68 | 2512 | capid = parse_cap(drop_entry); |
0fd73091 | 2513 | if (capid < 0) { |
1e11be34 DL |
2514 | ERROR("unknown capability %s", drop_entry); |
2515 | return -1; | |
81810dd1 DL |
2516 | } |
2517 | ||
b81689a1 CB |
2518 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(capid), prctl_arg(0), |
2519 | prctl_arg(0), prctl_arg(0)); | |
0fd73091 CB |
2520 | if (ret < 0) { |
2521 | SYSERROR("Failed to remove %s capability", drop_entry); | |
3ec1648d SH |
2522 | return -1; |
2523 | } | |
0fd73091 | 2524 | DEBUG("Dropped %s (%d) capability", drop_entry, capid); |
81810dd1 DL |
2525 | } |
2526 | ||
0fd73091 | 2527 | DEBUG("Capabilities have been setup"); |
1fb86a7c SH |
2528 | return 0; |
2529 | } | |
2530 | ||
2531 | static int dropcaps_except(struct lxc_list *caps) | |
2532 | { | |
2f443e88 | 2533 | __do_free int *caplist = NULL; |
0fd73091 | 2534 | int i, capid, numcaps; |
1fb86a7c | 2535 | char *keep_entry; |
0fd73091 | 2536 | struct lxc_list *iterator; |
1fb86a7c | 2537 | |
0fd73091 | 2538 | numcaps = lxc_caps_last_cap() + 1; |
2caf9a97 SH |
2539 | if (numcaps <= 0 || numcaps > 200) |
2540 | return -1; | |
0fd73091 | 2541 | TRACE("Found %d capabilities", numcaps); |
2caf9a97 | 2542 | |
1a0e70ac | 2543 | /* caplist[i] is 1 if we keep capability i */ |
2f443e88 | 2544 | caplist = must_realloc(NULL, numcaps * sizeof(int)); |
1fb86a7c SH |
2545 | memset(caplist, 0, numcaps * sizeof(int)); |
2546 | ||
0fd73091 | 2547 | lxc_list_for_each (iterator, caps) { |
1fb86a7c SH |
2548 | keep_entry = iterator->elem; |
2549 | ||
bab88e68 | 2550 | capid = parse_cap(keep_entry); |
7035407c DE |
2551 | if (capid == -2) |
2552 | continue; | |
2553 | ||
0fd73091 CB |
2554 | if (capid < 0) { |
2555 | ERROR("Unknown capability %s", keep_entry); | |
1fb86a7c SH |
2556 | return -1; |
2557 | } | |
2558 | ||
0fd73091 | 2559 | DEBUG("Keep capability %s (%d)", keep_entry, capid); |
1fb86a7c SH |
2560 | caplist[capid] = 1; |
2561 | } | |
0fd73091 CB |
2562 | |
2563 | for (i = 0; i < numcaps; i++) { | |
2564 | int ret; | |
2565 | ||
1fb86a7c SH |
2566 | if (caplist[i]) |
2567 | continue; | |
0fd73091 | 2568 | |
b81689a1 CB |
2569 | ret = prctl(PR_CAPBSET_DROP, prctl_arg(i), prctl_arg(0), |
2570 | prctl_arg(0), prctl_arg(0)); | |
0fd73091 CB |
2571 | if (ret < 0) { |
2572 | SYSERROR("Failed to remove capability %d", i); | |
3ec1648d SH |
2573 | return -1; |
2574 | } | |
1fb86a7c SH |
2575 | } |
2576 | ||
0fd73091 | 2577 | DEBUG("Capabilities have been setup"); |
81810dd1 DL |
2578 | return 0; |
2579 | } | |
2580 | ||
0fd73091 CB |
2581 | static int parse_resource(const char *res) |
2582 | { | |
2583 | int ret; | |
c6d09e15 WB |
2584 | size_t i; |
2585 | int resid = -1; | |
2586 | ||
0fd73091 | 2587 | for (i = 0; i < sizeof(limit_opt) / sizeof(limit_opt[0]); ++i) |
c6d09e15 WB |
2588 | if (strcmp(res, limit_opt[i].name) == 0) |
2589 | return limit_opt[i].value; | |
c6d09e15 | 2590 | |
0fd73091 | 2591 | /* Try to see if it's numeric, so the user may specify |
c6d09e15 | 2592 | * resources that the running kernel knows about but |
0fd73091 CB |
2593 | * we don't. |
2594 | */ | |
2595 | ret = lxc_safe_int(res, &resid); | |
2596 | if (ret < 0) | |
2597 | return -1; | |
2598 | ||
2599 | return resid; | |
c6d09e15 WB |
2600 | } |
2601 | ||
0fd73091 CB |
2602 | int setup_resource_limits(struct lxc_list *limits, pid_t pid) |
2603 | { | |
2604 | int resid; | |
c6d09e15 WB |
2605 | struct lxc_list *it; |
2606 | struct lxc_limit *lim; | |
c6d09e15 | 2607 | |
0fd73091 | 2608 | lxc_list_for_each (it, limits) { |
c6d09e15 WB |
2609 | lim = it->elem; |
2610 | ||
2611 | resid = parse_resource(lim->resource); | |
2612 | if (resid < 0) { | |
0fd73091 | 2613 | ERROR("Unknown resource %s", lim->resource); |
c6d09e15 WB |
2614 | return -1; |
2615 | } | |
2616 | ||
f48b5fd8 | 2617 | #if HAVE_PRLIMIT || HAVE_PRLIMIT64 |
c6d09e15 | 2618 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) { |
6d1400b5 | 2619 | SYSERROR("Failed to set limit %s", lim->resource); |
c6d09e15 WB |
2620 | return -1; |
2621 | } | |
2de12765 CB |
2622 | |
2623 | TRACE("Setup \"%s\" limit", lim->resource); | |
f48b5fd8 | 2624 | #else |
2de12765 | 2625 | ERROR("Cannot set limit \"%s\" as prlimit is missing", lim->resource); |
f48b5fd8 FF |
2626 | return -1; |
2627 | #endif | |
c6d09e15 | 2628 | } |
0fd73091 | 2629 | |
c6d09e15 WB |
2630 | return 0; |
2631 | } | |
2632 | ||
7edd0540 L |
2633 | int setup_sysctl_parameters(struct lxc_list *sysctls) |
2634 | { | |
e6f76452 | 2635 | __do_free char *tmp = NULL; |
7edd0540 L |
2636 | struct lxc_list *it; |
2637 | struct lxc_sysctl *elem; | |
0fd73091 | 2638 | int ret = 0; |
6b5a54cd | 2639 | char filename[PATH_MAX] = {0}; |
7edd0540 | 2640 | |
0fd73091 | 2641 | lxc_list_for_each (it, sysctls) { |
7edd0540 L |
2642 | elem = it->elem; |
2643 | tmp = lxc_string_replace(".", "/", elem->key); | |
2644 | if (!tmp) { | |
2645 | ERROR("Failed to replace key %s", elem->key); | |
2646 | return -1; | |
2647 | } | |
2648 | ||
2649 | ret = snprintf(filename, sizeof(filename), "/proc/sys/%s", tmp); | |
7edd0540 L |
2650 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { |
2651 | ERROR("Error setting up sysctl parameters path"); | |
2652 | return -1; | |
2653 | } | |
2654 | ||
0fd73091 | 2655 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2656 | strlen(elem->value), false, 0666); |
7edd0540 | 2657 | if (ret < 0) { |
688e8982 WB |
2658 | SYSERROR("Failed to setup sysctl parameters %s to %s", |
2659 | elem->key, elem->value); | |
7edd0540 L |
2660 | return -1; |
2661 | } | |
2662 | } | |
0fd73091 | 2663 | |
7edd0540 L |
2664 | return 0; |
2665 | } | |
2666 | ||
61d7a733 YT |
2667 | int setup_proc_filesystem(struct lxc_list *procs, pid_t pid) |
2668 | { | |
0c669152 | 2669 | __do_free char *tmp = NULL; |
61d7a733 YT |
2670 | struct lxc_list *it; |
2671 | struct lxc_proc *elem; | |
0fd73091 | 2672 | int ret = 0; |
6b5a54cd | 2673 | char filename[PATH_MAX] = {0}; |
61d7a733 | 2674 | |
0fd73091 | 2675 | lxc_list_for_each (it, procs) { |
61d7a733 YT |
2676 | elem = it->elem; |
2677 | tmp = lxc_string_replace(".", "/", elem->filename); | |
2678 | if (!tmp) { | |
2679 | ERROR("Failed to replace key %s", elem->filename); | |
2680 | return -1; | |
2681 | } | |
2682 | ||
2683 | ret = snprintf(filename, sizeof(filename), "/proc/%d/%s", pid, tmp); | |
61d7a733 YT |
2684 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { |
2685 | ERROR("Error setting up proc filesystem path"); | |
2686 | return -1; | |
2687 | } | |
2688 | ||
0fd73091 | 2689 | ret = lxc_write_to_file(filename, elem->value, |
7cea5905 | 2690 | strlen(elem->value), false, 0666); |
61d7a733 | 2691 | if (ret < 0) { |
688e8982 WB |
2692 | SYSERROR("Failed to setup proc filesystem %s to %s", |
2693 | elem->filename, elem->value); | |
61d7a733 YT |
2694 | return -1; |
2695 | } | |
2696 | } | |
0fd73091 | 2697 | |
61d7a733 YT |
2698 | return 0; |
2699 | } | |
2700 | ||
ae9242c8 SH |
2701 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2702 | ||
7b379ab3 | 2703 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2704 | { |
26ddeedd | 2705 | int i; |
0fd73091 | 2706 | struct lxc_conf *new; |
7b379ab3 | 2707 | |
13277ec4 | 2708 | new = malloc(sizeof(*new)); |
0fd73091 | 2709 | if (!new) |
7b379ab3 | 2710 | return NULL; |
7b379ab3 MN |
2711 | memset(new, 0, sizeof(*new)); |
2712 | ||
4b73005c | 2713 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
cccc74b5 | 2714 | new->personality = -1; |
124fa0a8 | 2715 | new->autodev = 1; |
3a784510 | 2716 | new->console.buffer_size = 0; |
596a818d DE |
2717 | new->console.log_path = NULL; |
2718 | new->console.log_fd = -1; | |
861813e5 | 2719 | new->console.log_size = 0; |
28a4b0e5 | 2720 | new->console.path = NULL; |
63376d7d | 2721 | new->console.peer = -1; |
fb87aa6a CB |
2722 | new->console.proxy.busy = -1; |
2723 | new->console.proxy.master = -1; | |
2724 | new->console.proxy.slave = -1; | |
63376d7d DL |
2725 | new->console.master = -1; |
2726 | new->console.slave = -1; | |
2727 | new->console.name[0] = '\0'; | |
732375f5 | 2728 | memset(&new->console.ringbuf, 0, sizeof(struct lxc_ringbuf)); |
d2e30e99 | 2729 | new->maincmd_fd = -1; |
258f8051 | 2730 | new->monitor_signal_pdeath = SIGKILL; |
76a26f55 | 2731 | new->nbd_idx = -1; |
54c30e29 | 2732 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 2733 | if (!new->rootfs.mount) { |
53f3f048 SH |
2734 | free(new); |
2735 | return NULL; | |
2736 | } | |
6e54330c | 2737 | new->rootfs.managed = true; |
858377e4 | 2738 | new->logfd = -1; |
7b379ab3 | 2739 | lxc_list_init(&new->cgroup); |
54860ed0 | 2740 | lxc_list_init(&new->cgroup2); |
7b379ab3 MN |
2741 | lxc_list_init(&new->network); |
2742 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2743 | lxc_list_init(&new->caps); |
1fb86a7c | 2744 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2745 | lxc_list_init(&new->id_map); |
46ad64ab CB |
2746 | new->root_nsuid_map = NULL; |
2747 | new->root_nsgid_map = NULL; | |
f979ac15 | 2748 | lxc_list_init(&new->includes); |
4184c3e1 | 2749 | lxc_list_init(&new->aliens); |
7c661726 | 2750 | lxc_list_init(&new->environment); |
c6d09e15 | 2751 | lxc_list_init(&new->limits); |
7edd0540 | 2752 | lxc_list_init(&new->sysctls); |
61d7a733 | 2753 | lxc_list_init(&new->procs); |
44ae0fb6 | 2754 | new->hooks_version = 0; |
28d9e29e | 2755 | for (i = 0; i < NUM_LXC_HOOKS; i++) |
26ddeedd | 2756 | lxc_list_init(&new->hooks[i]); |
ee1e7aa0 | 2757 | lxc_list_init(&new->groups); |
d39b10eb | 2758 | lxc_list_init(&new->state_clients); |
fe4de9a6 | 2759 | new->lsm_aa_profile = NULL; |
1800f924 | 2760 | lxc_list_init(&new->lsm_aa_raw); |
fe4de9a6 | 2761 | new->lsm_se_context = NULL; |
7a0bcca3 | 2762 | new->tmp_umount_proc = false; |
7a41e857 LT |
2763 | new->tmp_umount_proc = 0; |
2764 | new->shmount.path_host = NULL; | |
2765 | new->shmount.path_cont = NULL; | |
7b379ab3 | 2766 | |
72bb04e4 PT |
2767 | /* if running in a new user namespace, init and COMMAND |
2768 | * default to running as UID/GID 0 when using lxc-execute */ | |
2769 | new->init_uid = 0; | |
2770 | new->init_gid = 0; | |
43654d34 | 2771 | memset(&new->cgroup_meta, 0, sizeof(struct lxc_cgroup)); |
b074bbf1 | 2772 | memset(&new->ns_share, 0, sizeof(char *) * LXC_NS_MAX); |
72bb04e4 | 2773 | |
7b379ab3 | 2774 | return new; |
089cd8b8 DL |
2775 | } |
2776 | ||
344c9d81 | 2777 | int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
a19b974f | 2778 | size_t buf_size) |
f6d3e3e4 | 2779 | { |
29053180 | 2780 | int fd, ret; |
6b5a54cd | 2781 | char path[PATH_MAX]; |
f6d3e3e4 | 2782 | |
a19b974f CB |
2783 | if (geteuid() != 0 && idtype == ID_TYPE_GID) { |
2784 | size_t buflen; | |
2785 | ||
6b5a54cd CB |
2786 | ret = snprintf(path, PATH_MAX, "/proc/%d/setgroups", pid); |
2787 | if (ret < 0 || ret >= PATH_MAX) | |
a19b974f | 2788 | return -E2BIG; |
a19b974f CB |
2789 | |
2790 | fd = open(path, O_WRONLY); | |
2791 | if (fd < 0 && errno != ENOENT) { | |
2792 | SYSERROR("Failed to open \"%s\"", path); | |
2793 | return -1; | |
2794 | } | |
2795 | ||
2388737b | 2796 | if (fd >= 0) { |
6333c915 | 2797 | buflen = STRLITERALLEN("deny\n"); |
2388737b CB |
2798 | errno = 0; |
2799 | ret = lxc_write_nointr(fd, "deny\n", buflen); | |
395b1a3e | 2800 | close(fd); |
2388737b | 2801 | if (ret != buflen) { |
0fd73091 CB |
2802 | SYSERROR("Failed to write \"deny\" to " |
2803 | "\"/proc/%d/setgroups\"", pid); | |
2388737b CB |
2804 | return -1; |
2805 | } | |
395b1a3e | 2806 | TRACE("Wrote \"deny\" to \"/proc/%d/setgroups\"", pid); |
a19b974f | 2807 | } |
a19b974f CB |
2808 | } |
2809 | ||
6b5a54cd | 2810 | ret = snprintf(path, PATH_MAX, "/proc/%d/%cid_map", pid, |
29053180 | 2811 | idtype == ID_TYPE_UID ? 'u' : 'g'); |
6b5a54cd | 2812 | if (ret < 0 || ret >= PATH_MAX) |
f6d3e3e4 | 2813 | return -E2BIG; |
29053180 CB |
2814 | |
2815 | fd = open(path, O_WRONLY); | |
2816 | if (fd < 0) { | |
a19b974f | 2817 | SYSERROR("Failed to open \"%s\"", path); |
29053180 | 2818 | return -1; |
f6d3e3e4 | 2819 | } |
29053180 CB |
2820 | |
2821 | errno = 0; | |
2822 | ret = lxc_write_nointr(fd, buf, buf_size); | |
395b1a3e | 2823 | close(fd); |
29053180 | 2824 | if (ret != buf_size) { |
a19b974f | 2825 | SYSERROR("Failed to write %cid mapping to \"%s\"", |
29053180 | 2826 | idtype == ID_TYPE_UID ? 'u' : 'g', path); |
29053180 CB |
2827 | return -1; |
2828 | } | |
29053180 CB |
2829 | |
2830 | return 0; | |
f6d3e3e4 SH |
2831 | } |
2832 | ||
6e50e704 CB |
2833 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
2834 | * | |
2835 | * @return 1 if functional binary was found | |
2836 | * @return 0 if binary exists but is lacking privilege | |
2837 | * @return -ENOENT if binary does not exist | |
2838 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
6e50e704 | 2839 | */ |
df6a2945 CB |
2840 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
2841 | { | |
48411df2 | 2842 | __do_free char *path = NULL; |
df6a2945 CB |
2843 | int ret; |
2844 | struct stat st; | |
2845 | int fret = 0; | |
2846 | ||
6e50e704 CB |
2847 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
2848 | return -EINVAL; | |
2849 | ||
df6a2945 CB |
2850 | path = on_path(binary, NULL); |
2851 | if (!path) | |
2852 | return -ENOENT; | |
2853 | ||
2854 | ret = stat(path, &st); | |
2855 | if (ret < 0) { | |
2856 | fret = -errno; | |
2857 | goto cleanup; | |
2858 | } | |
2859 | ||
2860 | /* Check if the binary is setuid. */ | |
2861 | if (st.st_mode & S_ISUID) { | |
0fd73091 | 2862 | DEBUG("The binary \"%s\" does have the setuid bit set", path); |
df6a2945 CB |
2863 | fret = 1; |
2864 | goto cleanup; | |
2865 | } | |
2866 | ||
0fd73091 | 2867 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
2868 | /* Check if it has the CAP_SETUID capability. */ |
2869 | if ((cap & CAP_SETUID) && | |
2870 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
2871 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) { | |
2872 | DEBUG("The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE " | |
0fd73091 | 2873 | "and CAP_PERMITTED sets", path); |
df6a2945 CB |
2874 | fret = 1; |
2875 | goto cleanup; | |
2876 | } | |
2877 | ||
2878 | /* Check if it has the CAP_SETGID capability. */ | |
2879 | if ((cap & CAP_SETGID) && | |
2880 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
2881 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) { | |
2882 | DEBUG("The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE " | |
0fd73091 | 2883 | "and CAP_PERMITTED sets", path); |
df6a2945 CB |
2884 | fret = 1; |
2885 | goto cleanup; | |
2886 | } | |
0fd73091 | 2887 | #else |
69924fff CB |
2888 | /* If we cannot check for file capabilities we need to give the benefit |
2889 | * of the doubt. Otherwise we might fail even though all the necessary | |
2890 | * file capabilities are set. | |
2891 | */ | |
ffc40301 | 2892 | DEBUG("Cannot check for file capabilities as full capability support is " |
0fd73091 | 2893 | "missing. Manual intervention needed"); |
d6018f88 | 2894 | fret = 1; |
0fd73091 | 2895 | #endif |
df6a2945 CB |
2896 | |
2897 | cleanup: | |
df6a2945 CB |
2898 | return fret; |
2899 | } | |
2900 | ||
986ef930 CB |
2901 | int lxc_map_ids_exec_wrapper(void *args) |
2902 | { | |
2903 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
2904 | return -1; | |
2905 | } | |
2906 | ||
f6d3e3e4 SH |
2907 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) |
2908 | { | |
0fd73091 | 2909 | int fill, left; |
986ef930 | 2910 | char u_or_g; |
4bc3b759 | 2911 | char *pos; |
6b5a54cd | 2912 | char cmd_output[PATH_MAX]; |
0fd73091 CB |
2913 | struct id_map *map; |
2914 | struct lxc_list *iterator; | |
2915 | enum idtype type; | |
986ef930 CB |
2916 | /* strlen("new@idmap") = 9 |
2917 | * + | |
2918 | * strlen(" ") = 1 | |
2919 | * + | |
d33968ad | 2920 | * INTTYPE_TO_STRLEN(uint32_t) |
986ef930 CB |
2921 | * + |
2922 | * strlen(" ") = 1 | |
2923 | * | |
2924 | * We add some additional space to make sure that we really have | |
2925 | * LXC_IDMAPLEN bytes available for our the {g,u]id mapping. | |
2926 | */ | |
0fd73091 | 2927 | int ret = 0, gidmap = 0, uidmap = 0; |
d33968ad | 2928 | char mapbuf[9 + 1 + INTTYPE_TO_STRLEN(uint32_t) + 1 + LXC_IDMAPLEN] = {0}; |
0fd73091 | 2929 | bool had_entry = false, use_shadow = false; |
c724025c JC |
2930 | int hostuid, hostgid; |
2931 | ||
2932 | hostuid = geteuid(); | |
2933 | hostgid = getegid(); | |
df6a2945 CB |
2934 | |
2935 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid | |
2936 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
2937 | * will protected it by preventing another user from being handed the |
2938 | * range by shadow. | |
2939 | */ | |
df6a2945 | 2940 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
2941 | if (uidmap == -ENOENT) |
2942 | WARN("newuidmap binary is missing"); | |
2943 | else if (!uidmap) | |
2944 | WARN("newuidmap is lacking necessary privileges"); | |
2945 | ||
df6a2945 | 2946 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
2947 | if (gidmap == -ENOENT) |
2948 | WARN("newgidmap binary is missing"); | |
2949 | else if (!gidmap) | |
2950 | WARN("newgidmap is lacking necessary privileges"); | |
2951 | ||
df6a2945 | 2952 | if (uidmap > 0 && gidmap > 0) { |
0fd73091 | 2953 | DEBUG("Functional newuidmap and newgidmap binary found"); |
4bc3b759 | 2954 | use_shadow = true; |
df6a2945 | 2955 | } else { |
99d43365 CB |
2956 | /* In case unprivileged users run application containers via |
2957 | * execute() or a start*() there are valid cases where they may | |
2958 | * only want to map their own {g,u}id. Let's not block them from | |
2959 | * doing so by requiring geteuid() == 0. | |
2960 | */ | |
2961 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
c724025c JC |
2962 | "write directly with euid %d", hostuid); |
2963 | } | |
2964 | ||
2965 | /* Check if we really need to use newuidmap and newgidmap. | |
2966 | * If the user is only remapping his own {g,u}id, we don't need it. | |
2967 | */ | |
2968 | if (use_shadow && lxc_list_len(idmap) == 2) { | |
2969 | use_shadow = false; | |
2970 | lxc_list_for_each(iterator, idmap) { | |
2971 | map = iterator->elem; | |
2972 | if (map->idtype == ID_TYPE_UID && map->range == 1 && | |
2973 | map->nsid == hostuid && map->hostid == hostuid) | |
2974 | continue; | |
2975 | if (map->idtype == ID_TYPE_GID && map->range == 1 && | |
2976 | map->nsid == hostgid && map->hostid == hostgid) | |
2977 | continue; | |
2978 | use_shadow = true; | |
2979 | break; | |
2980 | } | |
0e6e3a41 | 2981 | } |
251d0d2a | 2982 | |
986ef930 CB |
2983 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
2984 | type++, u_or_g = 'g') { | |
2985 | pos = mapbuf; | |
2986 | ||
0e6e3a41 | 2987 | if (use_shadow) |
986ef930 | 2988 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 2989 | |
cf3ef16d | 2990 | lxc_list_for_each(iterator, idmap) { |
251d0d2a | 2991 | map = iterator->elem; |
cf3ef16d SH |
2992 | if (map->idtype != type) |
2993 | continue; | |
2994 | ||
4bc3b759 CB |
2995 | had_entry = true; |
2996 | ||
986ef930 | 2997 | left = LXC_IDMAPLEN - (pos - mapbuf); |
d1838f34 | 2998 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
2999 | use_shadow ? " " : "", map->nsid, |
3000 | map->hostid, map->range, | |
0e6e3a41 | 3001 | use_shadow ? "" : "\n"); |
a427e268 CB |
3002 | if (fill <= 0 || fill >= left) { |
3003 | /* The kernel only takes <= 4k for writes to | |
3004 | * /proc/<pid>/{g,u}id_map | |
3005 | */ | |
3006 | SYSERROR("Too many %cid mappings defined", u_or_g); | |
3007 | return -1; | |
3008 | } | |
4bc3b759 | 3009 | |
cf3ef16d | 3010 | pos += fill; |
251d0d2a | 3011 | } |
cf3ef16d | 3012 | if (!had_entry) |
4f7521b4 | 3013 | continue; |
cf3ef16d | 3014 | |
d85813cd | 3015 | /* Try to catch the output of new{g,u}idmap to make debugging |
986ef930 CB |
3016 | * easier. |
3017 | */ | |
3018 | if (use_shadow) { | |
3019 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3020 | lxc_map_ids_exec_wrapper, | |
3021 | (void *)mapbuf); | |
3022 | if (ret < 0) { | |
54fbbeb5 CB |
3023 | ERROR("new%cidmap failed to write mapping \"%s\": %s", |
3024 | u_or_g, cmd_output, mapbuf); | |
986ef930 CB |
3025 | return -1; |
3026 | } | |
54fbbeb5 | 3027 | TRACE("new%cidmap wrote mapping \"%s\"", u_or_g, mapbuf); |
d1838f34 | 3028 | } else { |
986ef930 | 3029 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
54fbbeb5 | 3030 | if (ret < 0) { |
da0f9977 | 3031 | ERROR("Failed to write mapping: %s", mapbuf); |
986ef930 | 3032 | return -1; |
54fbbeb5 CB |
3033 | } |
3034 | TRACE("Wrote mapping \"%s\"", mapbuf); | |
d1838f34 | 3035 | } |
986ef930 CB |
3036 | |
3037 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 3038 | } |
251d0d2a | 3039 | |
986ef930 | 3040 | return 0; |
f6d3e3e4 SH |
3041 | } |
3042 | ||
0fd73091 | 3043 | /* Return the host uid/gid to which the container root is mapped in val. |
0b3a6504 | 3044 | * Return true if id was found, false otherwise. |
cf3ef16d | 3045 | */ |
2a9a80cb | 3046 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
4160c3a0 | 3047 | unsigned long *val) |
cf3ef16d | 3048 | { |
4160c3a0 | 3049 | unsigned nsid; |
0fd73091 CB |
3050 | struct id_map *map; |
3051 | struct lxc_list *it; | |
4160c3a0 CB |
3052 | |
3053 | if (idtype == ID_TYPE_UID) | |
3054 | nsid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; | |
3055 | else | |
3056 | nsid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
cf3ef16d | 3057 | |
0fd73091 | 3058 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 3059 | map = it->elem; |
7b50c609 | 3060 | if (map->idtype != idtype) |
cf3ef16d | 3061 | continue; |
4160c3a0 | 3062 | if (map->nsid != nsid) |
cf3ef16d | 3063 | continue; |
2a9a80cb SH |
3064 | *val = map->hostid; |
3065 | return true; | |
cf3ef16d | 3066 | } |
4160c3a0 | 3067 | |
2a9a80cb | 3068 | return false; |
cf3ef16d SH |
3069 | } |
3070 | ||
2133f58c | 3071 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3072 | { |
cf3ef16d | 3073 | struct id_map *map; |
0fd73091 CB |
3074 | struct lxc_list *it; |
3075 | ||
3076 | lxc_list_for_each (it, &conf->id_map) { | |
cf3ef16d | 3077 | map = it->elem; |
2133f58c | 3078 | if (map->idtype != idtype) |
cf3ef16d | 3079 | continue; |
0fd73091 | 3080 | |
cf3ef16d | 3081 | if (id >= map->hostid && id < map->hostid + map->range) |
57d116ab | 3082 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 3083 | } |
0fd73091 | 3084 | |
57d116ab | 3085 | return -1; |
cf3ef16d SH |
3086 | } |
3087 | ||
339efad9 | 3088 | int find_unmapped_nsid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d | 3089 | { |
cf3ef16d | 3090 | struct id_map *map; |
0fd73091 | 3091 | struct lxc_list *it; |
2133f58c | 3092 | unsigned int freeid = 0; |
0fd73091 | 3093 | |
cf3ef16d | 3094 | again: |
0fd73091 | 3095 | lxc_list_for_each (it, &conf->id_map) { |
cf3ef16d | 3096 | map = it->elem; |
2133f58c | 3097 | if (map->idtype != idtype) |
cf3ef16d | 3098 | continue; |
0fd73091 | 3099 | |
cf3ef16d SH |
3100 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { |
3101 | freeid = map->nsid + map->range; | |
3102 | goto again; | |
3103 | } | |
3104 | } | |
0fd73091 | 3105 | |
cf3ef16d SH |
3106 | return freeid; |
3107 | } | |
3108 | ||
f4f52cb5 CB |
3109 | int chown_mapped_root_exec_wrapper(void *args) |
3110 | { | |
3111 | execvp("lxc-usernsexec", args); | |
3112 | return -1; | |
3113 | } | |
3114 | ||
0fd73091 | 3115 | /* chown_mapped_root: for an unprivileged user with uid/gid X to |
7b50c609 TS |
3116 | * chown a dir to subuid/subgid Y, he needs to run chown as root |
3117 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
3118 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
3119 | * root is privileged with respect to hostuid/hostgid X, allowing | |
3120 | * him to do the chown. | |
f6d3e3e4 | 3121 | */ |
41dc7155 | 3122 | int chown_mapped_root(const char *path, struct lxc_conf *conf) |
f6d3e3e4 | 3123 | { |
f4f52cb5 | 3124 | uid_t rootuid, rootgid; |
2a9a80cb | 3125 | unsigned long val; |
f4f52cb5 CB |
3126 | int hostuid, hostgid, ret; |
3127 | struct stat sb; | |
3128 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
3129 | char ugid[100]; | |
41dc7155 | 3130 | const char *args1[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3131 | "-m", map1, |
3132 | "-m", map2, | |
3133 | "-m", map3, | |
3134 | "-m", map5, | |
3135 | "--", "chown", ugid, path, | |
3136 | NULL}; | |
41dc7155 | 3137 | const char *args2[] = {"lxc-usernsexec", |
f4f52cb5 CB |
3138 | "-m", map1, |
3139 | "-m", map2, | |
3140 | "-m", map3, | |
3141 | "-m", map4, | |
3142 | "-m", map5, | |
3143 | "--", "chown", ugid, path, | |
3144 | NULL}; | |
6b5a54cd | 3145 | char cmd_output[PATH_MAX]; |
f4f52cb5 CB |
3146 | |
3147 | hostuid = geteuid(); | |
3148 | hostgid = getegid(); | |
f6d3e3e4 | 3149 | |
2a9a80cb | 3150 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
bc80f098 | 3151 | ERROR("No uid mapping for container root"); |
c4d10a05 | 3152 | return -1; |
f6d3e3e4 | 3153 | } |
f4f52cb5 | 3154 | rootuid = (uid_t)val; |
0fd73091 | 3155 | |
7b50c609 | 3156 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { |
bc80f098 | 3157 | ERROR("No gid mapping for container root"); |
7b50c609 TS |
3158 | return -1; |
3159 | } | |
f4f52cb5 | 3160 | rootgid = (gid_t)val; |
2a9a80cb | 3161 | |
f4f52cb5 | 3162 | if (hostuid == 0) { |
7b50c609 | 3163 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3164 | ERROR("Error chowning %s", path); |
3165 | return -1; | |
3166 | } | |
0fd73091 | 3167 | |
c4d10a05 SH |
3168 | return 0; |
3169 | } | |
f3d7e4ca | 3170 | |
f4f52cb5 | 3171 | if (rootuid == hostuid) { |
1a0e70ac | 3172 | /* nothing to do */ |
b103ceac | 3173 | INFO("Container root is our uid; no need to chown"); |
f3d7e4ca SH |
3174 | return 0; |
3175 | } | |
3176 | ||
bbdbf8f0 | 3177 | /* save the current gid of "path" */ |
f4f52cb5 CB |
3178 | if (stat(path, &sb) < 0) { |
3179 | ERROR("Error stat %s", path); | |
f6d3e3e4 SH |
3180 | return -1; |
3181 | } | |
7b50c609 | 3182 | |
bbdbf8f0 CB |
3183 | /* Update the path argument in case this was overlayfs. */ |
3184 | args1[sizeof(args1) / sizeof(args1[0]) - 2] = path; | |
3185 | args2[sizeof(args2) / sizeof(args2[0]) - 2] = path; | |
3186 | ||
f4f52cb5 CB |
3187 | /* |
3188 | * A file has to be group-owned by a gid mapped into the | |
3189 | * container, or the container won't be privileged over it. | |
3190 | */ | |
3191 | DEBUG("trying to chown \"%s\" to %d", path, hostgid); | |
3192 | if (sb.st_uid == hostuid && | |
3193 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3194 | chown(path, -1, hostgid) < 0) { | |
3195 | ERROR("Failed chgrping %s", path); | |
3196 | return -1; | |
3197 | } | |
f6d3e3e4 | 3198 | |
1a0e70ac | 3199 | /* "u:0:rootuid:1" */ |
f4f52cb5 CB |
3200 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); |
3201 | if (ret < 0 || ret >= 100) { | |
3202 | ERROR("Error uid printing map string"); | |
3203 | return -1; | |
3204 | } | |
7b50c609 | 3205 | |
1a0e70ac | 3206 | /* "u:hostuid:hostuid:1" */ |
f4f52cb5 CB |
3207 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); |
3208 | if (ret < 0 || ret >= 100) { | |
3209 | ERROR("Error uid printing map string"); | |
3210 | return -1; | |
3211 | } | |
c4d10a05 | 3212 | |
1a0e70ac | 3213 | /* "g:0:rootgid:1" */ |
f4f52cb5 CB |
3214 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); |
3215 | if (ret < 0 || ret >= 100) { | |
3216 | ERROR("Error gid printing map string"); | |
3217 | return -1; | |
3218 | } | |
98e5ba51 | 3219 | |
1a0e70ac | 3220 | /* "g:pathgid:rootgid+pathgid:1" */ |
f4f52cb5 CB |
3221 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, |
3222 | rootgid + (gid_t)sb.st_gid); | |
3223 | if (ret < 0 || ret >= 100) { | |
3224 | ERROR("Error gid printing map string"); | |
3225 | return -1; | |
3226 | } | |
c4d10a05 | 3227 | |
1a0e70ac | 3228 | /* "g:hostgid:hostgid:1" */ |
f4f52cb5 CB |
3229 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); |
3230 | if (ret < 0 || ret >= 100) { | |
3231 | ERROR("Error gid printing map string"); | |
3232 | return -1; | |
3233 | } | |
7b50c609 | 3234 | |
1a0e70ac | 3235 | /* "0:pathgid" (chown) */ |
f4f52cb5 CB |
3236 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); |
3237 | if (ret < 0 || ret >= 100) { | |
3238 | ERROR("Error owner printing format string for chown"); | |
3239 | return -1; | |
3240 | } | |
7b50c609 | 3241 | |
f4f52cb5 CB |
3242 | if (hostgid == sb.st_gid) |
3243 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3244 | chown_mapped_root_exec_wrapper, | |
3245 | (void *)args1); | |
3246 | else | |
3247 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3248 | chown_mapped_root_exec_wrapper, | |
3249 | (void *)args2); | |
3250 | if (ret < 0) | |
3251 | ERROR("lxc-usernsexec failed: %s", cmd_output); | |
7b50c609 | 3252 | |
f4f52cb5 | 3253 | return ret; |
f6d3e3e4 SH |
3254 | } |
3255 | ||
943144d9 CB |
3256 | /* NOTE: Must not be called from inside the container namespace! */ |
3257 | int lxc_create_tmp_proc_mount(struct lxc_conf *conf) | |
5112cd70 SH |
3258 | { |
3259 | int mounted; | |
3260 | ||
943144d9 | 3261 | mounted = lxc_mount_proc_if_needed(conf->rootfs.path ? conf->rootfs.mount : ""); |
5112cd70 | 3262 | if (mounted == -1) { |
0fd73091 | 3263 | SYSERROR("Failed to mount proc in the container"); |
01958b1f | 3264 | /* continue only if there is no rootfs */ |
943144d9 | 3265 | if (conf->rootfs.path) |
01958b1f | 3266 | return -1; |
5112cd70 | 3267 | } else if (mounted == 1) { |
7a0bcca3 | 3268 | conf->tmp_umount_proc = true; |
5112cd70 | 3269 | } |
943144d9 | 3270 | |
5112cd70 SH |
3271 | return 0; |
3272 | } | |
3273 | ||
3274 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3275 | { | |
7a0bcca3 | 3276 | if (!lxc_conf->tmp_umount_proc) |
0fd73091 CB |
3277 | return; |
3278 | ||
7a0bcca3 CB |
3279 | (void)umount2("/proc", MNT_DETACH); |
3280 | lxc_conf->tmp_umount_proc = false; | |
5112cd70 SH |
3281 | } |
3282 | ||
0fd73091 | 3283 | /* Walk /proc/mounts and change any shared entries to slave. */ |
6a0c909a | 3284 | void remount_all_slave(void) |
e995d7a2 | 3285 | { |
7969675f | 3286 | __do_free char *line = NULL; |
6a49f05e CB |
3287 | int memfd, mntinfo_fd, ret; |
3288 | ssize_t copied; | |
0fd73091 | 3289 | FILE *f; |
e995d7a2 SH |
3290 | size_t len = 0; |
3291 | ||
6a49f05e | 3292 | mntinfo_fd = open("/proc/self/mountinfo", O_RDONLY | O_CLOEXEC); |
fea3b91d DJ |
3293 | if (mntinfo_fd < 0) { |
3294 | SYSERROR("Failed to open \"/proc/self/mountinfo\""); | |
6a49f05e | 3295 | return; |
fea3b91d | 3296 | } |
6a49f05e CB |
3297 | |
3298 | memfd = memfd_create(".lxc_mountinfo", MFD_CLOEXEC); | |
3299 | if (memfd < 0) { | |
3300 | char template[] = P_tmpdir "/.lxc_mountinfo_XXXXXX"; | |
3301 | ||
3302 | if (errno != ENOSYS) { | |
fea3b91d | 3303 | SYSERROR("Failed to create temporary in-memory file"); |
6a49f05e | 3304 | close(mntinfo_fd); |
6a49f05e CB |
3305 | return; |
3306 | } | |
3307 | ||
3308 | memfd = lxc_make_tmpfile(template, true); | |
fea3b91d DJ |
3309 | if (memfd < 0) { |
3310 | close(mntinfo_fd); | |
3311 | WARN("Failed to create temporary file"); | |
3312 | return; | |
3313 | } | |
6a49f05e CB |
3314 | } |
3315 | ||
6a49f05e | 3316 | again: |
7c4d9466 | 3317 | copied = lxc_sendfile_nointr(memfd, mntinfo_fd, NULL, LXC_SENDFILE_MAX); |
6a49f05e CB |
3318 | if (copied < 0) { |
3319 | if (errno == EINTR) | |
3320 | goto again; | |
3321 | ||
fea3b91d | 3322 | SYSERROR("Failed to copy \"/proc/self/mountinfo\""); |
6a49f05e CB |
3323 | close(mntinfo_fd); |
3324 | close(memfd); | |
6a49f05e CB |
3325 | return; |
3326 | } | |
3327 | close(mntinfo_fd); | |
3328 | ||
3329 | /* After a successful fdopen() memfd will be closed when calling | |
3330 | * fclose(f). Calling close(memfd) afterwards is undefined. | |
3331 | */ | |
3332 | ret = lseek(memfd, 0, SEEK_SET); | |
3333 | if (ret < 0) { | |
fea3b91d | 3334 | SYSERROR("Failed to reset file descriptor offset"); |
6a49f05e | 3335 | close(memfd); |
6a49f05e CB |
3336 | return; |
3337 | } | |
3338 | ||
3339 | f = fdopen(memfd, "r"); | |
e995d7a2 | 3340 | if (!f) { |
fea3b91d DJ |
3341 | SYSERROR("Failed to open copy of \"/proc/self/mountinfo\" to mark " |
3342 | "all shared. Continuing"); | |
6a49f05e | 3343 | close(memfd); |
e995d7a2 SH |
3344 | return; |
3345 | } | |
3346 | ||
3347 | while (getline(&line, &len, f) != -1) { | |
0fd73091 CB |
3348 | char *opts, *target; |
3349 | ||
e995d7a2 SH |
3350 | target = get_field(line, 4); |
3351 | if (!target) | |
3352 | continue; | |
0fd73091 | 3353 | |
e995d7a2 SH |
3354 | opts = get_field(target, 2); |
3355 | if (!opts) | |
3356 | continue; | |
0fd73091 | 3357 | |
e995d7a2 SH |
3358 | null_endofword(opts); |
3359 | if (!strstr(opts, "shared")) | |
3360 | continue; | |
0fd73091 | 3361 | |
e995d7a2 | 3362 | null_endofword(target); |
0fd73091 CB |
3363 | ret = mount(NULL, target, NULL, MS_SLAVE, NULL); |
3364 | if (ret < 0) { | |
3365 | SYSERROR("Failed to make \"%s\" MS_SLAVE", target); | |
e995d7a2 | 3366 | ERROR("Continuing..."); |
6a49f05e | 3367 | continue; |
e995d7a2 | 3368 | } |
6a49f05e | 3369 | TRACE("Remounted \"%s\" as MS_SLAVE", target); |
e995d7a2 SH |
3370 | } |
3371 | fclose(f); | |
6a49f05e | 3372 | TRACE("Remounted all mount table entries as MS_SLAVE"); |
e995d7a2 SH |
3373 | } |
3374 | ||
794248d0 | 3375 | static int lxc_execute_bind_init(struct lxc_handler *handler) |
2322903b SH |
3376 | { |
3377 | int ret; | |
794248d0 CB |
3378 | char *p; |
3379 | char path[PATH_MAX], destpath[PATH_MAX]; | |
3380 | struct lxc_conf *conf = handler->conf; | |
9d9c111c SH |
3381 | |
3382 | /* If init exists in the container, don't bind mount a static one */ | |
3383 | p = choose_init(conf->rootfs.mount); | |
3384 | if (p) { | |
22f835ba | 3385 | __do_free char *old = p; |
41089848 TA |
3386 | |
3387 | p = strdup(old + strlen(conf->rootfs.mount)); | |
41089848 TA |
3388 | if (!p) |
3389 | return -ENOMEM; | |
3390 | ||
3391 | INFO("Found existing init at \"%s\"", p); | |
3392 | goto out; | |
9d9c111c | 3393 | } |
2322903b SH |
3394 | |
3395 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
0fd73091 | 3396 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3397 | return -1; |
2322903b SH |
3398 | |
3399 | if (!file_exists(path)) { | |
0fd73091 | 3400 | ERROR("The file \"%s\" does not exist on host", path); |
8353b4c9 | 3401 | return -1; |
2322903b SH |
3402 | } |
3403 | ||
794248d0 | 3404 | ret = snprintf(destpath, PATH_MAX, "%s" P_tmpdir "%s", conf->rootfs.mount, "/.lxc-init"); |
0fd73091 | 3405 | if (ret < 0 || ret >= PATH_MAX) |
8353b4c9 | 3406 | return -1; |
2322903b SH |
3407 | |
3408 | if (!file_exists(destpath)) { | |
794248d0 CB |
3409 | ret = mknod(destpath, S_IFREG | 0000, 0); |
3410 | if (ret < 0 && errno != EEXIST) { | |
3411 | SYSERROR("Failed to create dummy \"%s\" file as bind mount target", destpath); | |
8353b4c9 | 3412 | return -1; |
2322903b | 3413 | } |
2322903b SH |
3414 | } |
3415 | ||
592fd47a | 3416 | ret = safe_mount(path, destpath, "none", MS_BIND, NULL, conf->rootfs.mount); |
8353b4c9 | 3417 | if (ret < 0) { |
0fd73091 | 3418 | SYSERROR("Failed to bind mount lxc.init.static into container"); |
8353b4c9 CB |
3419 | return -1; |
3420 | } | |
3421 | ||
794248d0 CB |
3422 | p = strdup(destpath + strlen(conf->rootfs.mount)); |
3423 | if (!p) | |
3424 | return -ENOMEM; | |
794248d0 | 3425 | |
8353b4c9 | 3426 | INFO("Bind mounted lxc.init.static into container at \"%s\"", path); |
41089848 | 3427 | out: |
4b5b3a2a | 3428 | ((struct execute_args *)handler->data)->init_fd = -1; |
41089848 | 3429 | ((struct execute_args *)handler->data)->init_path = p; |
8353b4c9 | 3430 | return 0; |
2322903b SH |
3431 | } |
3432 | ||
0fd73091 CB |
3433 | /* This does the work of remounting / if it is shared, calling the container |
3434 | * pre-mount hooks, and mounting the rootfs. | |
35120d9c | 3435 | */ |
8ce1abc2 CB |
3436 | int lxc_setup_rootfs_prepare_root(struct lxc_conf *conf, const char *name, |
3437 | const char *lxcpath) | |
0ad19a3f | 3438 | { |
0fd73091 CB |
3439 | int ret; |
3440 | ||
35120d9c | 3441 | if (conf->rootfs_setup) { |
35120d9c | 3442 | const char *path = conf->rootfs.mount; |
0fd73091 CB |
3443 | |
3444 | /* The rootfs was set up in another namespace. bind-mount it to | |
3445 | * give us a mount in our own ns so we can pivot_root to it | |
3446 | */ | |
3447 | ret = mount(path, path, "rootfs", MS_BIND, NULL); | |
3448 | if (ret < 0) { | |
3449 | ERROR("Failed to bind mount container / onto itself"); | |
145832ba | 3450 | return -1; |
35120d9c | 3451 | } |
0fd73091 CB |
3452 | |
3453 | TRACE("Bind mounted container / onto itself"); | |
145832ba | 3454 | return 0; |
35120d9c | 3455 | } |
d4ef7c50 | 3456 | |
e995d7a2 SH |
3457 | remount_all_slave(); |
3458 | ||
0fd73091 CB |
3459 | ret = run_lxc_hooks(name, "pre-mount", conf, NULL); |
3460 | if (ret < 0) { | |
3461 | ERROR("Failed to run pre-mount hooks"); | |
35120d9c SH |
3462 | return -1; |
3463 | } | |
3464 | ||
8ce1abc2 | 3465 | ret = lxc_mount_rootfs(conf); |
0fd73091 CB |
3466 | if (ret < 0) { |
3467 | ERROR("Failed to setup rootfs for"); | |
35120d9c SH |
3468 | return -1; |
3469 | } | |
3470 | ||
3471 | conf->rootfs_setup = true; | |
3472 | return 0; | |
3473 | } | |
3474 | ||
1c1c7051 SH |
3475 | static bool verify_start_hooks(struct lxc_conf *conf) |
3476 | { | |
6b5a54cd | 3477 | char path[PATH_MAX]; |
0fd73091 CB |
3478 | struct lxc_list *it; |
3479 | ||
3480 | lxc_list_for_each (it, &conf->hooks[LXCHOOK_START]) { | |
1c1c7051 | 3481 | int ret; |
0fd73091 | 3482 | char *hookname = it->elem; |
1c1c7051 | 3483 | |
6b5a54cd | 3484 | ret = snprintf(path, PATH_MAX, "%s%s", |
0fd73091 CB |
3485 | conf->rootfs.path ? conf->rootfs.mount : "", |
3486 | hookname); | |
6b5a54cd | 3487 | if (ret < 0 || ret >= PATH_MAX) |
1c1c7051 | 3488 | return false; |
0fd73091 | 3489 | |
75193660 | 3490 | ret = access(path, X_OK); |
0fd73091 | 3491 | if (ret < 0) { |
75193660 | 3492 | SYSERROR("Start hook \"%s\" not found in container", |
0fd73091 | 3493 | hookname); |
1c1c7051 SH |
3494 | return false; |
3495 | } | |
0fd73091 | 3496 | |
6a0c909a | 3497 | return true; |
1c1c7051 SH |
3498 | } |
3499 | ||
3500 | return true; | |
3501 | } | |
3502 | ||
4b5b3a2a TA |
3503 | static bool execveat_supported(void) |
3504 | { | |
13be2733 | 3505 | lxc_raw_execveat(-1, "", NULL, NULL, AT_EMPTY_PATH); |
4b5b3a2a TA |
3506 | if (errno == ENOSYS) |
3507 | return false; | |
3508 | ||
3509 | return true; | |
4b5b3a2a TA |
3510 | } |
3511 | ||
3b988b33 | 3512 | int lxc_setup(struct lxc_handler *handler) |
35120d9c | 3513 | { |
2187efd3 | 3514 | int ret; |
0fd73091 | 3515 | const char *lxcpath = handler->lxcpath, *name = handler->name; |
35120d9c | 3516 | struct lxc_conf *lxc_conf = handler->conf; |
35120d9c | 3517 | |
8ce1abc2 | 3518 | ret = lxc_setup_rootfs_prepare_root(lxc_conf, name, lxcpath); |
8353b4c9 CB |
3519 | if (ret < 0) { |
3520 | ERROR("Failed to setup rootfs"); | |
35120d9c SH |
3521 | return -1; |
3522 | } | |
3523 | ||
28d9e29e | 3524 | if (handler->nsfd[LXC_NS_UTS] == -1) { |
8353b4c9 CB |
3525 | ret = setup_utsname(lxc_conf->utsname); |
3526 | if (ret < 0) { | |
0fd73091 | 3527 | ERROR("Failed to setup the utsname %s", name); |
6c544cb3 MM |
3528 | return -1; |
3529 | } | |
0ad19a3f | 3530 | } |
3531 | ||
b25291da CB |
3532 | ret = lxc_setup_keyring(); |
3533 | if (ret < 0) | |
3534 | return -1; | |
3535 | ||
8353b4c9 CB |
3536 | ret = lxc_setup_network_in_child_namespaces(lxc_conf, &lxc_conf->network); |
3537 | if (ret < 0) { | |
3538 | ERROR("Failed to setup network"); | |
95b5ffaf | 3539 | return -1; |
0ad19a3f | 3540 | } |
3541 | ||
8353b4c9 CB |
3542 | ret = lxc_network_send_name_and_ifindex_to_parent(handler); |
3543 | if (ret < 0) { | |
3544 | ERROR("Failed to send network device names and ifindices to parent"); | |
790255cf CB |
3545 | return -1; |
3546 | } | |
3547 | ||
bc6928ff | 3548 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3549 | ret = mount_autodev(name, &lxc_conf->rootfs, lxcpath); |
3550 | if (ret < 0) { | |
3551 | ERROR("Failed to mount \"/dev\""); | |
c6883f38 SH |
3552 | return -1; |
3553 | } | |
3554 | } | |
3555 | ||
8353b4c9 CB |
3556 | /* Do automatic mounts (mainly /proc and /sys), but exclude those that |
3557 | * need to wait until other stuff has finished. | |
368bbc02 | 3558 | */ |
8353b4c9 CB |
3559 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler); |
3560 | if (ret < 0) { | |
3561 | ERROR("Failed to setup first automatic mounts"); | |
368bbc02 CS |
3562 | return -1; |
3563 | } | |
3564 | ||
8353b4c9 CB |
3565 | ret = setup_mount(lxc_conf, &lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath); |
3566 | if (ret < 0) { | |
3567 | ERROR("Failed to setup mounts"); | |
95b5ffaf | 3568 | return -1; |
576f946d | 3569 | } |
3570 | ||
8353b4c9 | 3571 | if (lxc_conf->is_execute) { |
4b5b3a2a TA |
3572 | if (execveat_supported()) { |
3573 | int fd; | |
3574 | char path[PATH_MAX]; | |
3575 | ||
3576 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
3577 | if (ret < 0 || ret >= PATH_MAX) { | |
3578 | ERROR("Path to init.lxc.static too long"); | |
3579 | return -1; | |
3580 | } | |
3581 | ||
3582 | fd = open(path, O_PATH | O_CLOEXEC); | |
3583 | if (fd < 0) { | |
3584 | SYSERROR("Unable to open lxc.init.static"); | |
3585 | return -1; | |
3586 | } | |
3587 | ||
3588 | ((struct execute_args *)handler->data)->init_fd = fd; | |
3589 | ((struct execute_args *)handler->data)->init_path = NULL; | |
3590 | } else { | |
3591 | ret = lxc_execute_bind_init(handler); | |
3592 | if (ret < 0) { | |
3593 | ERROR("Failed to bind-mount the lxc init system"); | |
3594 | return -1; | |
3595 | } | |
8353b4c9 CB |
3596 | } |
3597 | } | |
2322903b | 3598 | |
8353b4c9 CB |
3599 | /* Now mount only cgroups, if wanted. Before, /sys could not have been |
3600 | * mounted. It is guaranteed to be mounted now either through | |
3601 | * automatically or via fstab entries. | |
368bbc02 | 3602 | */ |
8353b4c9 CB |
3603 | ret = lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler); |
3604 | if (ret < 0) { | |
3605 | ERROR("Failed to setup remaining automatic mounts"); | |
368bbc02 CS |
3606 | return -1; |
3607 | } | |
3608 | ||
8353b4c9 | 3609 | ret = run_lxc_hooks(name, "mount", lxc_conf, NULL); |
1a2cf89d | 3610 | if (ret < 0) { |
8353b4c9 | 3611 | ERROR("Failed to run mount hooks"); |
773fb9ca SH |
3612 | return -1; |
3613 | } | |
3614 | ||
bc6928ff | 3615 | if (lxc_conf->autodev > 0) { |
8353b4c9 CB |
3616 | ret = run_lxc_hooks(name, "autodev", lxc_conf, NULL); |
3617 | if (ret < 0) { | |
3618 | ERROR("Failed to run autodev hooks"); | |
f7bee6c6 MW |
3619 | return -1; |
3620 | } | |
06749971 | 3621 | |
8353b4c9 CB |
3622 | ret = lxc_fill_autodev(&lxc_conf->rootfs); |
3623 | if (ret < 0) { | |
3624 | ERROR("Failed to populate \"/dev\""); | |
91c3830e SH |
3625 | return -1; |
3626 | } | |
3627 | } | |
368bbc02 | 3628 | |
8353b4c9 CB |
3629 | if (!lxc_list_empty(&lxc_conf->mount_list)) { |
3630 | ret = setup_mount_entries(lxc_conf, &lxc_conf->rootfs, | |
3631 | &lxc_conf->mount_list, name, lxcpath); | |
3632 | if (ret < 0) { | |
3633 | ERROR("Failed to setup mount entries"); | |
3634 | return -1; | |
3635 | } | |
181437fd YT |
3636 | } |
3637 | ||
75193660 CB |
3638 | /* Make sure any start hooks are in the container */ |
3639 | if (!verify_start_hooks(lxc_conf)) { | |
3640 | ERROR("Failed to verify start hooks"); | |
3641 | return -1; | |
3642 | } | |
3643 | ||
ed8704d0 | 3644 | ret = lxc_setup_console(&lxc_conf->rootfs, &lxc_conf->console, |
885766f5 | 3645 | lxc_conf->ttys.dir); |
ed8704d0 CB |
3646 | if (ret < 0) { |
3647 | ERROR("Failed to setup console"); | |
95b5ffaf | 3648 | return -1; |
6e590161 | 3649 | } |
3650 | ||
ed8704d0 CB |
3651 | ret = lxc_setup_dev_symlinks(&lxc_conf->rootfs); |
3652 | if (ret < 0) { | |
8353b4c9 | 3653 | ERROR("Failed to setup \"/dev\" symlinks"); |
69aa6655 DE |
3654 | return -1; |
3655 | } | |
3656 | ||
8353b4c9 CB |
3657 | ret = lxc_create_tmp_proc_mount(lxc_conf); |
3658 | if (ret < 0) { | |
3659 | ERROR("Failed to \"/proc\" LSMs"); | |
e075f5d9 | 3660 | return -1; |
e075f5d9 | 3661 | } |
e075f5d9 | 3662 | |
8ce1abc2 | 3663 | ret = lxc_setup_rootfs_switch_root(&lxc_conf->rootfs); |
8353b4c9 CB |
3664 | if (ret < 0) { |
3665 | ERROR("Failed to pivot root into rootfs"); | |
95b5ffaf | 3666 | return -1; |
ed502555 | 3667 | } |
3668 | ||
8353b4c9 CB |
3669 | ret = lxc_setup_devpts(lxc_conf); |
3670 | if (ret < 0) { | |
3671 | ERROR("Failed to setup new devpts instance"); | |
95b5ffaf | 3672 | return -1; |
3c26f34e | 3673 | } |
3674 | ||
2187efd3 CB |
3675 | ret = lxc_create_ttys(handler); |
3676 | if (ret < 0) | |
e8bd4e43 | 3677 | return -1; |
e8bd4e43 | 3678 | |
8353b4c9 CB |
3679 | ret = setup_personality(lxc_conf->personality); |
3680 | if (ret < 0) { | |
3681 | ERROR("Failed to set personality"); | |
cccc74b5 DL |
3682 | return -1; |
3683 | } | |
3684 | ||
8353b4c9 CB |
3685 | /* Set sysctl value to a path under /proc/sys as determined from the |
3686 | * key. For e.g. net.ipv4.ip_forward translated to | |
3687 | * /proc/sys/net/ipv4/ip_forward. | |
7edd0540 L |
3688 | */ |
3689 | if (!lxc_list_empty(&lxc_conf->sysctls)) { | |
3690 | ret = setup_sysctl_parameters(&lxc_conf->sysctls); | |
8353b4c9 CB |
3691 | if (ret < 0) { |
3692 | ERROR("Failed to setup sysctl parameters"); | |
7edd0540 | 3693 | return -1; |
8353b4c9 | 3694 | } |
7edd0540 L |
3695 | } |
3696 | ||
97a8f74f SG |
3697 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
3698 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
8353b4c9 CB |
3699 | ERROR("Container requests lxc.cap.drop and " |
3700 | "lxc.cap.keep: either use lxc.cap.drop or " | |
3701 | "lxc.cap.keep, not both"); | |
f6d3e3e4 SH |
3702 | return -1; |
3703 | } | |
8353b4c9 | 3704 | |
97a8f74f | 3705 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
8353b4c9 | 3706 | ERROR("Failed to keep capabilities"); |
97a8f74f SG |
3707 | return -1; |
3708 | } | |
3709 | } else if (setup_caps(&lxc_conf->caps)) { | |
8353b4c9 | 3710 | ERROR("Failed to drop capabilities"); |
97a8f74f | 3711 | return -1; |
81810dd1 DL |
3712 | } |
3713 | ||
8353b4c9 | 3714 | NOTICE("The container \"%s\" is set up", name); |
cd54d859 | 3715 | |
0ad19a3f | 3716 | return 0; |
3717 | } | |
26ddeedd | 3718 | |
3f60c2f7 | 3719 | int run_lxc_hooks(const char *name, char *hookname, struct lxc_conf *conf, |
14a7b0f9 | 3720 | char *argv[]) |
26ddeedd | 3721 | { |
26ddeedd | 3722 | struct lxc_list *it; |
3f60c2f7 | 3723 | int which = -1; |
26ddeedd | 3724 | |
3f60c2f7 | 3725 | if (strcmp(hookname, "pre-start") == 0) |
26ddeedd | 3726 | which = LXCHOOK_PRESTART; |
3f60c2f7 | 3727 | else if (strcmp(hookname, "start-host") == 0) |
08dd2805 | 3728 | which = LXCHOOK_START_HOST; |
3f60c2f7 | 3729 | else if (strcmp(hookname, "pre-mount") == 0) |
5ea6163a | 3730 | which = LXCHOOK_PREMOUNT; |
3f60c2f7 | 3731 | else if (strcmp(hookname, "mount") == 0) |
26ddeedd | 3732 | which = LXCHOOK_MOUNT; |
3f60c2f7 | 3733 | else if (strcmp(hookname, "autodev") == 0) |
f7bee6c6 | 3734 | which = LXCHOOK_AUTODEV; |
3f60c2f7 | 3735 | else if (strcmp(hookname, "start") == 0) |
26ddeedd | 3736 | which = LXCHOOK_START; |
3f60c2f7 | 3737 | else if (strcmp(hookname, "stop") == 0) |
52492063 | 3738 | which = LXCHOOK_STOP; |
3f60c2f7 | 3739 | else if (strcmp(hookname, "post-stop") == 0) |
26ddeedd | 3740 | which = LXCHOOK_POSTSTOP; |
3f60c2f7 | 3741 | else if (strcmp(hookname, "clone") == 0) |
148e91f5 | 3742 | which = LXCHOOK_CLONE; |
3f60c2f7 | 3743 | else if (strcmp(hookname, "destroy") == 0) |
37cf711b | 3744 | which = LXCHOOK_DESTROY; |
26ddeedd SH |
3745 | else |
3746 | return -1; | |
3f60c2f7 | 3747 | |
0fd73091 | 3748 | lxc_list_for_each (it, &conf->hooks[which]) { |
26ddeedd | 3749 | int ret; |
3f60c2f7 CB |
3750 | char *hook = it->elem; |
3751 | ||
3752 | ret = run_script_argv(name, conf->hooks_version, "lxc", hook, | |
14a7b0f9 | 3753 | hookname, argv); |
3f60c2f7 CB |
3754 | if (ret < 0) |
3755 | return -1; | |
26ddeedd | 3756 | } |
3f60c2f7 | 3757 | |
26ddeedd SH |
3758 | return 0; |
3759 | } | |
72d0e1cb | 3760 | |
72d0e1cb SG |
3761 | int lxc_clear_config_caps(struct lxc_conf *c) |
3762 | { | |
1a0e70ac | 3763 | struct lxc_list *it, *next; |
72d0e1cb | 3764 | |
0fd73091 | 3765 | lxc_list_for_each_safe (it, &c->caps, next) { |
72d0e1cb SG |
3766 | lxc_list_del(it); |
3767 | free(it->elem); | |
3768 | free(it); | |
3769 | } | |
0fd73091 | 3770 | |
72d0e1cb SG |
3771 | return 0; |
3772 | } | |
3773 | ||
c7e345ae CB |
3774 | static int lxc_free_idmap(struct lxc_list *id_map) |
3775 | { | |
27c27d73 SH |
3776 | struct lxc_list *it, *next; |
3777 | ||
0fd73091 | 3778 | lxc_list_for_each_safe (it, id_map, next) { |
27c27d73 SH |
3779 | lxc_list_del(it); |
3780 | free(it->elem); | |
3781 | free(it); | |
3782 | } | |
c7e345ae | 3783 | |
27c27d73 SH |
3784 | return 0; |
3785 | } | |
3786 | ||
4355ab5f SH |
3787 | int lxc_clear_idmaps(struct lxc_conf *c) |
3788 | { | |
3789 | return lxc_free_idmap(&c->id_map); | |
3790 | } | |
3791 | ||
1fb86a7c SH |
3792 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
3793 | { | |
0fd73091 | 3794 | struct lxc_list *it, *next; |
1fb86a7c | 3795 | |
0fd73091 | 3796 | lxc_list_for_each_safe (it, &c->keepcaps, next) { |
1fb86a7c SH |
3797 | lxc_list_del(it); |
3798 | free(it->elem); | |
3799 | free(it); | |
3800 | } | |
0fd73091 | 3801 | |
1fb86a7c SH |
3802 | return 0; |
3803 | } | |
3804 | ||
a3ed9b81 | 3805 | int lxc_clear_namespace(struct lxc_conf *c) |
3806 | { | |
3807 | int i; | |
3808 | for (i = 0; i < LXC_NS_MAX; i++) { | |
3809 | free(c->ns_share[i]); | |
3810 | c->ns_share[i] = NULL; | |
3811 | } | |
3812 | return 0; | |
3813 | } | |
3814 | ||
54860ed0 | 3815 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version) |
72d0e1cb | 3816 | { |
54860ed0 | 3817 | char *global_token, *namespaced_token; |
ab1a6cac | 3818 | size_t namespaced_token_len; |
54860ed0 | 3819 | struct lxc_list *it, *next, *list; |
ab1a6cac | 3820 | const char *k = key; |
54860ed0 | 3821 | bool all = false; |
72d0e1cb | 3822 | |
54860ed0 CB |
3823 | if (version == CGROUP2_SUPER_MAGIC) { |
3824 | global_token = "lxc.cgroup2"; | |
3825 | namespaced_token = "lxc.cgroup2."; | |
6333c915 | 3826 | namespaced_token_len = STRLITERALLEN("lxc.cgroup2."); |
54860ed0 CB |
3827 | list = &c->cgroup2; |
3828 | } else if (version == CGROUP_SUPER_MAGIC) { | |
3829 | global_token = "lxc.cgroup"; | |
3830 | namespaced_token = "lxc.cgroup."; | |
6333c915 | 3831 | namespaced_token_len = STRLITERALLEN("lxc.cgroup."); |
54860ed0 CB |
3832 | list = &c->cgroup; |
3833 | } else { | |
ab1a6cac | 3834 | return -EINVAL; |
54860ed0 CB |
3835 | } |
3836 | ||
3837 | if (strcmp(key, global_token) == 0) | |
72d0e1cb | 3838 | all = true; |
6333c915 | 3839 | else if (strncmp(key, namespaced_token, namespaced_token_len) == 0) |
ab1a6cac | 3840 | k += namespaced_token_len; |
a6390f01 | 3841 | else |
ab1a6cac | 3842 | return -EINVAL; |
72d0e1cb | 3843 | |
0fd73091 | 3844 | lxc_list_for_each_safe (it, list, next) { |
72d0e1cb | 3845 | struct lxc_cgroup *cg = it->elem; |
54860ed0 | 3846 | |
72d0e1cb SG |
3847 | if (!all && strcmp(cg->subsystem, k) != 0) |
3848 | continue; | |
54860ed0 | 3849 | |
72d0e1cb SG |
3850 | lxc_list_del(it); |
3851 | free(cg->subsystem); | |
3852 | free(cg->value); | |
3853 | free(cg); | |
3854 | free(it); | |
3855 | } | |
e409b214 | 3856 | |
72d0e1cb SG |
3857 | return 0; |
3858 | } | |
3859 | ||
c6d09e15 WB |
3860 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
3861 | { | |
3862 | struct lxc_list *it, *next; | |
c6d09e15 | 3863 | const char *k = NULL; |
0fd73091 | 3864 | bool all = false; |
c6d09e15 | 3865 | |
b668653c | 3866 | if (strcmp(key, "lxc.limit") == 0 || strcmp(key, "lxc.prlimit") == 0) |
c6d09e15 | 3867 | all = true; |
6333c915 CB |
3868 | else if (strncmp(key, "lxc.limit.", STRLITERALLEN("lxc.limit.")) == 0) |
3869 | k = key + STRLITERALLEN("lxc.limit."); | |
3870 | else if (strncmp(key, "lxc.prlimit.", STRLITERALLEN("lxc.prlimit.")) == 0) | |
3871 | k = key + STRLITERALLEN("lxc.prlimit."); | |
c6d09e15 WB |
3872 | else |
3873 | return -1; | |
3874 | ||
0fd73091 | 3875 | lxc_list_for_each_safe (it, &c->limits, next) { |
c6d09e15 | 3876 | struct lxc_limit *lim = it->elem; |
0fd73091 | 3877 | |
c6d09e15 WB |
3878 | if (!all && strcmp(lim->resource, k) != 0) |
3879 | continue; | |
0fd73091 | 3880 | |
c6d09e15 WB |
3881 | lxc_list_del(it); |
3882 | free(lim->resource); | |
3883 | free(lim); | |
3884 | free(it); | |
3885 | } | |
b668653c | 3886 | |
c6d09e15 WB |
3887 | return 0; |
3888 | } | |
3889 | ||
7edd0540 L |
3890 | int lxc_clear_sysctls(struct lxc_conf *c, const char *key) |
3891 | { | |
3892 | struct lxc_list *it, *next; | |
7edd0540 | 3893 | const char *k = NULL; |
0fd73091 | 3894 | bool all = false; |
7edd0540 L |
3895 | |
3896 | if (strcmp(key, "lxc.sysctl") == 0) | |
3897 | all = true; | |
6333c915 CB |
3898 | else if (strncmp(key, "lxc.sysctl.", STRLITERALLEN("lxc.sysctl.")) == 0) |
3899 | k = key + STRLITERALLEN("lxc.sysctl."); | |
7edd0540 L |
3900 | else |
3901 | return -1; | |
3902 | ||
0fd73091 | 3903 | lxc_list_for_each_safe (it, &c->sysctls, next) { |
7edd0540 | 3904 | struct lxc_sysctl *elem = it->elem; |
0fd73091 | 3905 | |
7edd0540 L |
3906 | if (!all && strcmp(elem->key, k) != 0) |
3907 | continue; | |
0fd73091 | 3908 | |
7edd0540 L |
3909 | lxc_list_del(it); |
3910 | free(elem->key); | |
3911 | free(elem->value); | |
3912 | free(elem); | |
3913 | free(it); | |
3914 | } | |
0fd73091 | 3915 | |
7edd0540 L |
3916 | return 0; |
3917 | } | |
3918 | ||
61d7a733 YT |
3919 | int lxc_clear_procs(struct lxc_conf *c, const char *key) |
3920 | { | |
0fd73091 | 3921 | struct lxc_list *it, *next; |
61d7a733 | 3922 | const char *k = NULL; |
0fd73091 | 3923 | bool all = false; |
61d7a733 YT |
3924 | |
3925 | if (strcmp(key, "lxc.proc") == 0) | |
3926 | all = true; | |
6333c915 CB |
3927 | else if (strncmp(key, "lxc.proc.", STRLITERALLEN("lxc.proc.")) == 0) |
3928 | k = key + STRLITERALLEN("lxc.proc."); | |
61d7a733 YT |
3929 | else |
3930 | return -1; | |
3931 | ||
0fd73091 | 3932 | lxc_list_for_each_safe (it, &c->procs, next) { |
61d7a733 | 3933 | struct lxc_proc *proc = it->elem; |
0fd73091 | 3934 | |
61d7a733 YT |
3935 | if (!all && strcmp(proc->filename, k) != 0) |
3936 | continue; | |
0fd73091 | 3937 | |
61d7a733 YT |
3938 | lxc_list_del(it); |
3939 | free(proc->filename); | |
3940 | free(proc->value); | |
3941 | free(proc); | |
3942 | free(it); | |
3943 | } | |
3944 | ||
3945 | return 0; | |
3946 | } | |
3947 | ||
ee1e7aa0 SG |
3948 | int lxc_clear_groups(struct lxc_conf *c) |
3949 | { | |
0fd73091 | 3950 | struct lxc_list *it, *next; |
ee1e7aa0 | 3951 | |
0fd73091 | 3952 | lxc_list_for_each_safe (it, &c->groups, next) { |
ee1e7aa0 SG |
3953 | lxc_list_del(it); |
3954 | free(it->elem); | |
3955 | free(it); | |
3956 | } | |
0fd73091 | 3957 | |
ee1e7aa0 SG |
3958 | return 0; |
3959 | } | |
3960 | ||
ab799c0b SG |
3961 | int lxc_clear_environment(struct lxc_conf *c) |
3962 | { | |
0fd73091 | 3963 | struct lxc_list *it, *next; |
ab799c0b | 3964 | |
0fd73091 | 3965 | lxc_list_for_each_safe (it, &c->environment, next) { |
ab799c0b SG |
3966 | lxc_list_del(it); |
3967 | free(it->elem); | |
3968 | free(it); | |
3969 | } | |
0fd73091 | 3970 | |
ab799c0b SG |
3971 | return 0; |
3972 | } | |
3973 | ||
72d0e1cb SG |
3974 | int lxc_clear_mount_entries(struct lxc_conf *c) |
3975 | { | |
0fd73091 | 3976 | struct lxc_list *it, *next; |
72d0e1cb | 3977 | |
0fd73091 | 3978 | lxc_list_for_each_safe (it, &c->mount_list, next) { |
72d0e1cb SG |
3979 | lxc_list_del(it); |
3980 | free(it->elem); | |
3981 | free(it); | |
3982 | } | |
0fd73091 | 3983 | |
72d0e1cb SG |
3984 | return 0; |
3985 | } | |
3986 | ||
b099e9e9 SH |
3987 | int lxc_clear_automounts(struct lxc_conf *c) |
3988 | { | |
3989 | c->auto_mounts = 0; | |
3990 | return 0; | |
3991 | } | |
3992 | ||
12a50cc6 | 3993 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 3994 | { |
72d0e1cb | 3995 | int i; |
0fd73091 CB |
3996 | struct lxc_list *it, *next; |
3997 | const char *k = NULL; | |
3998 | bool all = false, done = false; | |
72d0e1cb | 3999 | |
17ed13a3 SH |
4000 | if (strcmp(key, "lxc.hook") == 0) |
4001 | all = true; | |
6333c915 CB |
4002 | else if (strncmp(key, "lxc.hook.", STRLITERALLEN("lxc.hook.")) == 0) |
4003 | k = key + STRLITERALLEN("lxc.hook."); | |
a6390f01 WB |
4004 | else |
4005 | return -1; | |
17ed13a3 | 4006 | |
0fd73091 | 4007 | for (i = 0; i < NUM_LXC_HOOKS; i++) { |
17ed13a3 | 4008 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
0fd73091 | 4009 | lxc_list_for_each_safe (it, &c->hooks[i], next) { |
17ed13a3 SH |
4010 | lxc_list_del(it); |
4011 | free(it->elem); | |
4012 | free(it); | |
4013 | } | |
0fd73091 | 4014 | |
17ed13a3 | 4015 | done = true; |
72d0e1cb SG |
4016 | } |
4017 | } | |
17ed13a3 SH |
4018 | |
4019 | if (!done) { | |
4020 | ERROR("Invalid hook key: %s", key); | |
4021 | return -1; | |
4022 | } | |
0fd73091 | 4023 | |
72d0e1cb SG |
4024 | return 0; |
4025 | } | |
8eb5694b | 4026 | |
4184c3e1 SH |
4027 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
4028 | { | |
0fd73091 | 4029 | struct lxc_list *it, *next; |
4184c3e1 | 4030 | |
0fd73091 | 4031 | lxc_list_for_each_safe (it, &conf->aliens, next) { |
4184c3e1 SH |
4032 | lxc_list_del(it); |
4033 | free(it->elem); | |
4034 | free(it); | |
4035 | } | |
4036 | } | |
4037 | ||
c7b15d1e | 4038 | void lxc_clear_includes(struct lxc_conf *conf) |
f979ac15 | 4039 | { |
0fd73091 | 4040 | struct lxc_list *it, *next; |
f979ac15 | 4041 | |
0fd73091 | 4042 | lxc_list_for_each_safe (it, &conf->includes, next) { |
f979ac15 SH |
4043 | lxc_list_del(it); |
4044 | free(it->elem); | |
4045 | free(it); | |
4046 | } | |
4047 | } | |
4048 | ||
1800f924 WB |
4049 | int lxc_clear_apparmor_raw(struct lxc_conf *c) |
4050 | { | |
4051 | struct lxc_list *it, *next; | |
4052 | ||
4053 | lxc_list_for_each_safe (it, &c->lsm_aa_raw, next) { | |
4054 | lxc_list_del(it); | |
4055 | free(it->elem); | |
4056 | free(it); | |
4057 | } | |
4058 | ||
4059 | return 0; | |
4060 | } | |
4061 | ||
8eb5694b SH |
4062 | void lxc_conf_free(struct lxc_conf *conf) |
4063 | { | |
4064 | if (!conf) | |
4065 | return; | |
0fd73091 | 4066 | |
858377e4 SH |
4067 | if (current_config == conf) |
4068 | current_config = NULL; | |
aed105d5 | 4069 | lxc_terminal_conf_free(&conf->console); |
f10fad2f | 4070 | free(conf->rootfs.mount); |
b3b8c97f | 4071 | free(conf->rootfs.bdev_type); |
f10fad2f ME |
4072 | free(conf->rootfs.options); |
4073 | free(conf->rootfs.path); | |
f10fad2f | 4074 | free(conf->logfile); |
858377e4 SH |
4075 | if (conf->logfd != -1) |
4076 | close(conf->logfd); | |
f10fad2f | 4077 | free(conf->utsname); |
885766f5 CB |
4078 | free(conf->ttys.dir); |
4079 | free(conf->ttys.tty_names); | |
f10fad2f ME |
4080 | free(conf->fstab); |
4081 | free(conf->rcfile); | |
5cda27c1 | 4082 | free(conf->execute_cmd); |
f10fad2f | 4083 | free(conf->init_cmd); |
3c491553 | 4084 | free(conf->init_cwd); |
6b0d5538 | 4085 | free(conf->unexpanded_config); |
76d0127f | 4086 | free(conf->syslog); |
c302b476 | 4087 | lxc_free_networks(&conf->network); |
f10fad2f | 4088 | free(conf->lsm_aa_profile); |
1800f924 | 4089 | free(conf->lsm_aa_profile_computed); |
f10fad2f | 4090 | free(conf->lsm_se_context); |
769872f9 | 4091 | lxc_seccomp_free(conf); |
8eb5694b | 4092 | lxc_clear_config_caps(conf); |
1fb86a7c | 4093 | lxc_clear_config_keepcaps(conf); |
54860ed0 CB |
4094 | lxc_clear_cgroups(conf, "lxc.cgroup", CGROUP_SUPER_MAGIC); |
4095 | lxc_clear_cgroups(conf, "lxc.cgroup2", CGROUP2_SUPER_MAGIC); | |
17ed13a3 | 4096 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 4097 | lxc_clear_mount_entries(conf); |
27c27d73 | 4098 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 4099 | lxc_clear_groups(conf); |
f979ac15 | 4100 | lxc_clear_includes(conf); |
761d81ca | 4101 | lxc_clear_aliens(conf); |
ab799c0b | 4102 | lxc_clear_environment(conf); |
240d4b74 | 4103 | lxc_clear_limits(conf, "lxc.prlimit"); |
7edd0540 | 4104 | lxc_clear_sysctls(conf, "lxc.sysctl"); |
61d7a733 | 4105 | lxc_clear_procs(conf, "lxc.proc"); |
1800f924 | 4106 | lxc_clear_apparmor_raw(conf); |
a3ed9b81 | 4107 | lxc_clear_namespace(conf); |
43654d34 CB |
4108 | free(conf->cgroup_meta.dir); |
4109 | free(conf->cgroup_meta.controllers); | |
7a41e857 LT |
4110 | free(conf->shmount.path_host); |
4111 | free(conf->shmount.path_cont); | |
8eb5694b SH |
4112 | free(conf); |
4113 | } | |
4355ab5f SH |
4114 | |
4115 | struct userns_fn_data { | |
4116 | int (*fn)(void *); | |
c9b7c33e | 4117 | const char *fn_name; |
4355ab5f SH |
4118 | void *arg; |
4119 | int p[2]; | |
4120 | }; | |
4121 | ||
4122 | static int run_userns_fn(void *data) | |
4123 | { | |
adaffdd7 | 4124 | int ret; |
4355ab5f | 4125 | char c; |
0fd73091 | 4126 | struct userns_fn_data *d = data; |
4355ab5f | 4127 | |
f8aa4bf3 | 4128 | /* Close write end of the pipe. */ |
4355ab5f | 4129 | close(d->p[1]); |
f8aa4bf3 CB |
4130 | |
4131 | /* Wait for parent to finish establishing a new mapping in the user | |
4132 | * namespace we are executing in. | |
4133 | */ | |
adaffdd7 | 4134 | ret = lxc_read_nointr(d->p[0], &c, 1); |
f8aa4bf3 | 4135 | /* Close read end of the pipe. */ |
4355ab5f | 4136 | close(d->p[0]); |
adaffdd7 CB |
4137 | if (ret != 1) |
4138 | return -1; | |
f8aa4bf3 | 4139 | |
c9b7c33e | 4140 | if (d->fn_name) |
adaffdd7 | 4141 | TRACE("Calling function \"%s\"", d->fn_name); |
0fd73091 | 4142 | |
f8aa4bf3 | 4143 | /* Call function to run. */ |
4355ab5f SH |
4144 | return d->fn(d->arg); |
4145 | } | |
4146 | ||
db7cfe23 CB |
4147 | static struct id_map *mapped_nsid_add(struct lxc_conf *conf, unsigned id, |
4148 | enum idtype idtype) | |
4149 | { | |
5173b710 CB |
4150 | const struct id_map *map; |
4151 | struct id_map *retmap; | |
db7cfe23 CB |
4152 | |
4153 | map = find_mapped_nsid_entry(conf, id, idtype); | |
4154 | if (!map) | |
4155 | return NULL; | |
4156 | ||
4157 | retmap = malloc(sizeof(*retmap)); | |
4158 | if (!retmap) | |
4159 | return NULL; | |
4160 | ||
4161 | memcpy(retmap, map, sizeof(*retmap)); | |
4162 | return retmap; | |
4163 | } | |
4164 | ||
c4333195 CB |
4165 | static struct id_map *find_mapped_hostid_entry(struct lxc_conf *conf, |
4166 | unsigned id, enum idtype idtype) | |
f8aa4bf3 | 4167 | { |
f8aa4bf3 | 4168 | struct id_map *map; |
0fd73091 | 4169 | struct lxc_list *it; |
f8aa4bf3 CB |
4170 | struct id_map *retmap = NULL; |
4171 | ||
0fd73091 | 4172 | lxc_list_for_each (it, &conf->id_map) { |
f8aa4bf3 CB |
4173 | map = it->elem; |
4174 | if (map->idtype != idtype) | |
4175 | continue; | |
4176 | ||
4177 | if (id >= map->hostid && id < map->hostid + map->range) { | |
4178 | retmap = map; | |
4179 | break; | |
4180 | } | |
4181 | } | |
4182 | ||
f8aa4bf3 CB |
4183 | return retmap; |
4184 | } | |
4185 | ||
0fd73091 | 4186 | /* Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
f8aa4bf3 | 4187 | * existing one or establish a new one. |
4355ab5f | 4188 | */ |
0fd73091 CB |
4189 | static struct id_map *mapped_hostid_add(struct lxc_conf *conf, uid_t id, |
4190 | enum idtype type) | |
4355ab5f | 4191 | { |
28a2d9e7 | 4192 | int hostid_mapped; |
c4333195 CB |
4193 | struct id_map *entry = NULL, *tmp = NULL; |
4194 | ||
4195 | entry = malloc(sizeof(*entry)); | |
4196 | if (!entry) | |
4197 | return NULL; | |
f8aa4bf3 | 4198 | |
28a2d9e7 | 4199 | /* Reuse existing mapping. */ |
c4333195 CB |
4200 | tmp = find_mapped_hostid_entry(conf, id, type); |
4201 | if (tmp) | |
4202 | return memcpy(entry, tmp, sizeof(*entry)); | |
f8aa4bf3 | 4203 | |
28a2d9e7 CB |
4204 | /* Find new mapping. */ |
4205 | hostid_mapped = find_unmapped_nsid(conf, type); | |
4206 | if (hostid_mapped < 0) { | |
c4333195 CB |
4207 | DEBUG("Failed to find free mapping for id %d", id); |
4208 | free(entry); | |
28a2d9e7 | 4209 | return NULL; |
f8aa4bf3 | 4210 | } |
f8aa4bf3 | 4211 | |
28a2d9e7 CB |
4212 | entry->idtype = type; |
4213 | entry->nsid = hostid_mapped; | |
4214 | entry->hostid = (unsigned long)id; | |
4215 | entry->range = 1; | |
4355ab5f | 4216 | |
28a2d9e7 | 4217 | return entry; |
4355ab5f SH |
4218 | } |
4219 | ||
dcf0ffdf | 4220 | struct lxc_list *get_minimal_idmap(struct lxc_conf *conf) |
4355ab5f | 4221 | { |
00d6cfe2 CB |
4222 | __do_free struct id_map *container_root_uid = NULL, |
4223 | *container_root_gid = NULL, | |
4224 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4225 | __do_free struct lxc_list *idmap = NULL; | |
f8aa4bf3 | 4226 | uid_t euid, egid; |
4160c3a0 CB |
4227 | uid_t nsuid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; |
4228 | gid_t nsgid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
00d6cfe2 | 4229 | struct lxc_list *tmplist = NULL; |
4355ab5f | 4230 | |
db7cfe23 | 4231 | /* Find container root mappings. */ |
4160c3a0 | 4232 | container_root_uid = mapped_nsid_add(conf, nsuid, ID_TYPE_UID); |
db7cfe23 | 4233 | if (!container_root_uid) { |
dcf0ffdf | 4234 | DEBUG("Failed to find mapping for namespace uid %d", 0); |
00d6cfe2 | 4235 | return NULL; |
f8aa4bf3 | 4236 | } |
dcf0ffdf CB |
4237 | euid = geteuid(); |
4238 | if (euid >= container_root_uid->hostid && | |
4239 | euid < (container_root_uid->hostid + container_root_uid->range)) | |
db7cfe23 | 4240 | host_uid_map = container_root_uid; |
f8aa4bf3 | 4241 | |
4160c3a0 | 4242 | container_root_gid = mapped_nsid_add(conf, nsgid, ID_TYPE_GID); |
db7cfe23 | 4243 | if (!container_root_gid) { |
dcf0ffdf | 4244 | DEBUG("Failed to find mapping for namespace gid %d", 0); |
00d6cfe2 | 4245 | return NULL; |
f8aa4bf3 | 4246 | } |
dcf0ffdf CB |
4247 | egid = getegid(); |
4248 | if (egid >= container_root_gid->hostid && | |
4249 | egid < (container_root_gid->hostid + container_root_gid->range)) | |
db7cfe23 | 4250 | host_gid_map = container_root_gid; |
f8aa4bf3 CB |
4251 | |
4252 | /* Check whether the {g,u}id of the user has a mapping. */ | |
954b7d9b | 4253 | if (!host_uid_map) |
c4333195 | 4254 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
28a2d9e7 | 4255 | if (!host_uid_map) { |
db7cfe23 | 4256 | DEBUG("Failed to find mapping for uid %d", euid); |
00d6cfe2 | 4257 | return NULL; |
f8aa4bf3 CB |
4258 | } |
4259 | ||
dcf0ffdf CB |
4260 | if (!host_gid_map) |
4261 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); | |
28a2d9e7 | 4262 | if (!host_gid_map) { |
db7cfe23 | 4263 | DEBUG("Failed to find mapping for gid %d", egid); |
00d6cfe2 | 4264 | return NULL; |
28a2d9e7 CB |
4265 | } |
4266 | ||
4267 | /* Allocate new {g,u}id map list. */ | |
4268 | idmap = malloc(sizeof(*idmap)); | |
4269 | if (!idmap) | |
00d6cfe2 | 4270 | return NULL; |
28a2d9e7 CB |
4271 | lxc_list_init(idmap); |
4272 | ||
f8aa4bf3 CB |
4273 | /* Add container root to the map. */ |
4274 | tmplist = malloc(sizeof(*tmplist)); | |
4275 | if (!tmplist) | |
00d6cfe2 | 4276 | return NULL; |
f8aa4bf3 CB |
4277 | lxc_list_add_elem(tmplist, container_root_uid); |
4278 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4279 | |
1d90e064 | 4280 | if (host_uid_map && (host_uid_map != container_root_uid)) { |
28a2d9e7 | 4281 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4282 | move_ptr(container_root_uid); |
28a2d9e7 CB |
4283 | |
4284 | /* Add container root to the map. */ | |
4285 | tmplist = malloc(sizeof(*tmplist)); | |
4286 | if (!tmplist) | |
00d6cfe2 | 4287 | return NULL; |
28a2d9e7 CB |
4288 | lxc_list_add_elem(tmplist, host_uid_map); |
4289 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4290 | } |
1d90e064 | 4291 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4292 | move_ptr(container_root_uid); |
1d90e064 | 4293 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4294 | move_ptr(host_uid_map); |
f8aa4bf3 CB |
4295 | |
4296 | tmplist = malloc(sizeof(*tmplist)); | |
4297 | if (!tmplist) | |
00d6cfe2 | 4298 | return NULL; |
f8aa4bf3 CB |
4299 | lxc_list_add_elem(tmplist, container_root_gid); |
4300 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4301 | |
1d90e064 | 4302 | if (host_gid_map && (host_gid_map != container_root_gid)) { |
28a2d9e7 | 4303 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4304 | move_ptr(container_root_gid); |
28a2d9e7 CB |
4305 | |
4306 | tmplist = malloc(sizeof(*tmplist)); | |
4307 | if (!tmplist) | |
00d6cfe2 | 4308 | return NULL; |
28a2d9e7 CB |
4309 | lxc_list_add_elem(tmplist, host_gid_map); |
4310 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4311 | } |
1d90e064 | 4312 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4313 | move_ptr(container_root_gid); |
1d90e064 | 4314 | /* idmap will now keep track of that memory. */ |
00d6cfe2 | 4315 | move_ptr(host_gid_map); |
f8aa4bf3 | 4316 | |
dcf0ffdf | 4317 | TRACE("Allocated minimal idmapping"); |
00d6cfe2 | 4318 | return move_ptr(idmap); |
dcf0ffdf CB |
4319 | } |
4320 | ||
4321 | /* Run a function in a new user namespace. | |
4322 | * The caller's euid/egid will be mapped if it is not already. | |
4323 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
4324 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
4325 | * This means we require only to establish a mapping from: | |
4326 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
4327 | * - the container root -> some sub{g,u}id | |
915e3dbd | 4328 | * The former we add, if the user did not specify a mapping. The latter we |
6f3fd27f | 4329 | * retrieve from the container's configured {g,u}id mappings as it must have been |
dcf0ffdf CB |
4330 | * there to start the container in the first place. |
4331 | */ | |
4332 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data, | |
4333 | const char *fn_name) | |
4334 | { | |
4335 | pid_t pid; | |
dcf0ffdf | 4336 | int p[2]; |
0fd73091 | 4337 | struct userns_fn_data d; |
dcf0ffdf | 4338 | struct lxc_list *idmap; |
0fd73091 CB |
4339 | int ret = -1, status = -1; |
4340 | char c = '1'; | |
dcf0ffdf | 4341 | |
2b2655a8 CB |
4342 | if (!conf) |
4343 | return -EINVAL; | |
4344 | ||
dcf0ffdf CB |
4345 | idmap = get_minimal_idmap(conf); |
4346 | if (!idmap) | |
4347 | return -1; | |
4348 | ||
979f9e34 | 4349 | ret = pipe2(p, O_CLOEXEC); |
dcf0ffdf CB |
4350 | if (ret < 0) { |
4351 | SYSERROR("Failed to create pipe"); | |
4352 | return -1; | |
4353 | } | |
4354 | d.fn = fn; | |
4355 | d.fn_name = fn_name; | |
4356 | d.arg = data; | |
4357 | d.p[0] = p[0]; | |
4358 | d.p[1] = p[1]; | |
4359 | ||
4360 | /* Clone child in new user namespace. */ | |
4361 | pid = lxc_raw_clone_cb(run_userns_fn, &d, CLONE_NEWUSER); | |
4362 | if (pid < 0) { | |
0fd73091 | 4363 | ERROR("Failed to clone process in new user namespace"); |
dcf0ffdf CB |
4364 | goto on_error; |
4365 | } | |
4366 | ||
4367 | close(p[0]); | |
4368 | p[0] = -1; | |
4369 | ||
4b73005c CB |
4370 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || |
4371 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
dcf0ffdf | 4372 | struct id_map *map; |
0fd73091 | 4373 | struct lxc_list *it; |
dcf0ffdf | 4374 | |
0fd73091 | 4375 | lxc_list_for_each (it, idmap) { |
f8aa4bf3 | 4376 | map = it->elem; |
dcf0ffdf | 4377 | TRACE("Establishing %cid mapping for \"%d\" in new " |
f8aa4bf3 | 4378 | "user namespace: nsuid %lu - hostid %lu - range " |
0fd73091 CB |
4379 | "%lu", |
4380 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4381 | map->nsid, map->hostid, map->range); | |
f8aa4bf3 | 4382 | } |
4355ab5f SH |
4383 | } |
4384 | ||
f8aa4bf3 | 4385 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 4386 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 | 4387 | if (ret < 0) { |
0fd73091 | 4388 | ERROR("Error setting up {g,u}id mappings for child process \"%d\"", pid); |
f8aa4bf3 | 4389 | goto on_error; |
4355ab5f SH |
4390 | } |
4391 | ||
f8aa4bf3 | 4392 | /* Tell child to proceed. */ |
489f39be | 4393 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
dcf0ffdf | 4394 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
f8aa4bf3 | 4395 | goto on_error; |
4355ab5f SH |
4396 | } |
4397 | ||
686dd5d1 | 4398 | on_error: |
4355ab5f SH |
4399 | if (p[0] != -1) |
4400 | close(p[0]); | |
4401 | close(p[1]); | |
f8aa4bf3 | 4402 | |
ee1b16bc TA |
4403 | /* Wait for child to finish. */ |
4404 | if (pid > 0) | |
4405 | status = wait_for_pid(pid); | |
4406 | ||
686dd5d1 CB |
4407 | if (status < 0) |
4408 | ret = -1; | |
4409 | ||
f8aa4bf3 | 4410 | return ret; |
4355ab5f | 4411 | } |
97e9cfa0 | 4412 | |
415a8851 CB |
4413 | int userns_exec_full(struct lxc_conf *conf, int (*fn)(void *), void *data, |
4414 | const char *fn_name) | |
4415 | { | |
4416 | pid_t pid; | |
4417 | uid_t euid, egid; | |
415a8851 CB |
4418 | int p[2]; |
4419 | struct id_map *map; | |
4420 | struct lxc_list *cur; | |
0fd73091 | 4421 | struct userns_fn_data d; |
415a8851 | 4422 | int ret = -1; |
0fd73091 | 4423 | char c = '1'; |
415a8851 CB |
4424 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
4425 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, | |
4426 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4427 | ||
2b2655a8 CB |
4428 | if (!conf) |
4429 | return -EINVAL; | |
4430 | ||
979f9e34 | 4431 | ret = pipe2(p, O_CLOEXEC); |
415a8851 CB |
4432 | if (ret < 0) { |
4433 | SYSERROR("opening pipe"); | |
4434 | return -1; | |
4435 | } | |
4436 | d.fn = fn; | |
4437 | d.fn_name = fn_name; | |
4438 | d.arg = data; | |
4439 | d.p[0] = p[0]; | |
4440 | d.p[1] = p[1]; | |
4441 | ||
4442 | /* Clone child in new user namespace. */ | |
4443 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER); | |
4444 | if (pid < 0) { | |
0fd73091 | 4445 | ERROR("Failed to clone process in new user namespace"); |
415a8851 CB |
4446 | goto on_error; |
4447 | } | |
4448 | ||
4449 | close(p[0]); | |
4450 | p[0] = -1; | |
4451 | ||
4452 | euid = geteuid(); | |
4453 | egid = getegid(); | |
4454 | ||
4455 | /* Allocate new {g,u}id map list. */ | |
4456 | idmap = malloc(sizeof(*idmap)); | |
4457 | if (!idmap) | |
4458 | goto on_error; | |
4459 | lxc_list_init(idmap); | |
4460 | ||
4461 | /* Find container root. */ | |
0fd73091 | 4462 | lxc_list_for_each (cur, &conf->id_map) { |
415a8851 CB |
4463 | struct id_map *tmpmap; |
4464 | ||
4465 | tmplist = malloc(sizeof(*tmplist)); | |
4466 | if (!tmplist) | |
4467 | goto on_error; | |
4468 | ||
4469 | tmpmap = malloc(sizeof(*tmpmap)); | |
4470 | if (!tmpmap) { | |
4471 | free(tmplist); | |
4472 | goto on_error; | |
4473 | } | |
4474 | ||
4475 | memset(tmpmap, 0, sizeof(*tmpmap)); | |
4476 | memcpy(tmpmap, cur->elem, sizeof(*tmpmap)); | |
4477 | tmplist->elem = tmpmap; | |
4478 | ||
4479 | lxc_list_add_tail(idmap, tmplist); | |
4480 | ||
4481 | map = cur->elem; | |
4482 | ||
4483 | if (map->idtype == ID_TYPE_UID) | |
4484 | if (euid >= map->hostid && euid < map->hostid + map->range) | |
4485 | host_uid_map = map; | |
4486 | ||
4487 | if (map->idtype == ID_TYPE_GID) | |
4488 | if (egid >= map->hostid && egid < map->hostid + map->range) | |
4489 | host_gid_map = map; | |
4490 | ||
4491 | if (map->nsid != 0) | |
4492 | continue; | |
4493 | ||
4494 | if (map->idtype == ID_TYPE_UID) | |
4495 | if (container_root_uid == NULL) | |
4496 | container_root_uid = map; | |
4497 | ||
4498 | if (map->idtype == ID_TYPE_GID) | |
4499 | if (container_root_gid == NULL) | |
4500 | container_root_gid = map; | |
4501 | } | |
4502 | ||
4503 | if (!container_root_uid || !container_root_gid) { | |
4504 | ERROR("No mapping for container root found"); | |
4505 | goto on_error; | |
4506 | } | |
4507 | ||
4508 | /* Check whether the {g,u}id of the user has a mapping. */ | |
4509 | if (!host_uid_map) | |
c4333195 | 4510 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
415a8851 CB |
4511 | else |
4512 | host_uid_map = container_root_uid; | |
4513 | ||
4514 | if (!host_gid_map) | |
c4333195 | 4515 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); |
415a8851 CB |
4516 | else |
4517 | host_gid_map = container_root_gid; | |
4518 | ||
4519 | if (!host_uid_map) { | |
4520 | DEBUG("Failed to find mapping for uid %d", euid); | |
4521 | goto on_error; | |
4522 | } | |
4523 | ||
4524 | if (!host_gid_map) { | |
4525 | DEBUG("Failed to find mapping for gid %d", egid); | |
4526 | goto on_error; | |
4527 | } | |
4528 | ||
4529 | if (host_uid_map && (host_uid_map != container_root_uid)) { | |
4530 | /* Add container root to the map. */ | |
4531 | tmplist = malloc(sizeof(*tmplist)); | |
4532 | if (!tmplist) | |
4533 | goto on_error; | |
4534 | lxc_list_add_elem(tmplist, host_uid_map); | |
4535 | lxc_list_add_tail(idmap, tmplist); | |
4536 | } | |
4537 | /* idmap will now keep track of that memory. */ | |
4538 | host_uid_map = NULL; | |
4539 | ||
4540 | if (host_gid_map && (host_gid_map != container_root_gid)) { | |
4541 | tmplist = malloc(sizeof(*tmplist)); | |
4542 | if (!tmplist) | |
4543 | goto on_error; | |
4544 | lxc_list_add_elem(tmplist, host_gid_map); | |
4545 | lxc_list_add_tail(idmap, tmplist); | |
4546 | } | |
4547 | /* idmap will now keep track of that memory. */ | |
4548 | host_gid_map = NULL; | |
4549 | ||
4550 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || | |
4551 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
0fd73091 | 4552 | lxc_list_for_each (cur, idmap) { |
415a8851 CB |
4553 | map = cur->elem; |
4554 | TRACE("establishing %cid mapping for \"%d\" in new " | |
4555 | "user namespace: nsuid %lu - hostid %lu - range " | |
4556 | "%lu", | |
4557 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4558 | map->nsid, map->hostid, map->range); | |
4559 | } | |
4560 | } | |
4561 | ||
4562 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
4563 | ret = lxc_map_ids(idmap, pid); | |
4564 | if (ret < 0) { | |
0fd73091 | 4565 | ERROR("error setting up {g,u}id mappings for child process \"%d\"", pid); |
415a8851 CB |
4566 | goto on_error; |
4567 | } | |
4568 | ||
4569 | /* Tell child to proceed. */ | |
489f39be | 4570 | if (lxc_write_nointr(p[1], &c, 1) != 1) { |
0fd73091 | 4571 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
415a8851 CB |
4572 | goto on_error; |
4573 | } | |
4574 | ||
686dd5d1 | 4575 | on_error: |
ee1b16bc TA |
4576 | if (p[0] != -1) |
4577 | close(p[0]); | |
4578 | close(p[1]); | |
4579 | ||
415a8851 | 4580 | /* Wait for child to finish. */ |
686dd5d1 CB |
4581 | if (pid > 0) |
4582 | ret = wait_for_pid(pid); | |
415a8851 | 4583 | |
80758b4b | 4584 | if (idmap) { |
415a8851 | 4585 | lxc_free_idmap(idmap); |
80758b4b DJ |
4586 | free(idmap); |
4587 | } | |
4588 | ||
415a8851 CB |
4589 | if (host_uid_map && (host_uid_map != container_root_uid)) |
4590 | free(host_uid_map); | |
4591 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4592 | free(host_gid_map); | |
4593 | ||
415a8851 CB |
4594 | return ret; |
4595 | } | |
4596 | ||
a96a8e8c | 4597 | /* not thread-safe, do not use from api without first forking */ |
0fd73091 | 4598 | static char *getuname(void) |
97e9cfa0 | 4599 | { |
cb7aa5e8 DJ |
4600 | struct passwd pwent; |
4601 | struct passwd *pwentp = NULL; | |
4602 | char *buf; | |
4603 | char *username; | |
4604 | size_t bufsize; | |
4605 | int ret; | |
97e9cfa0 | 4606 | |
cb7aa5e8 DJ |
4607 | bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); |
4608 | if (bufsize == -1) | |
4609 | bufsize = 1024; | |
4610 | ||
4611 | buf = malloc(bufsize); | |
4612 | if (!buf) | |
97e9cfa0 SH |
4613 | return NULL; |
4614 | ||
cb7aa5e8 DJ |
4615 | ret = getpwuid_r(geteuid(), &pwent, buf, bufsize, &pwentp); |
4616 | if (!pwentp) { | |
4617 | if (ret == 0) | |
4618 | WARN("Could not find matched password record."); | |
4619 | ||
4620 | ERROR("Failed to get password record - %u", geteuid()); | |
4621 | free(buf); | |
4622 | return NULL; | |
4623 | } | |
4624 | ||
4625 | username = strdup(pwent.pw_name); | |
4626 | free(buf); | |
4627 | ||
4628 | return username; | |
97e9cfa0 SH |
4629 | } |
4630 | ||
a96a8e8c | 4631 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4632 | static char *getgname(void) |
4633 | { | |
3de9fb4c DJ |
4634 | struct group grent; |
4635 | struct group *grentp = NULL; | |
4636 | char *buf; | |
4637 | char *grname; | |
4638 | size_t bufsize; | |
4639 | int ret; | |
4640 | ||
4641 | bufsize = sysconf(_SC_GETGR_R_SIZE_MAX); | |
4642 | if (bufsize == -1) | |
4643 | bufsize = 1024; | |
4644 | ||
4645 | buf = malloc(bufsize); | |
4646 | if (!buf) | |
4647 | return NULL; | |
4648 | ||
4649 | ret = getgrgid_r(getegid(), &grent, buf, bufsize, &grentp); | |
4650 | if (!grentp) { | |
4651 | if (ret == 0) | |
4652 | WARN("Could not find matched group record"); | |
97e9cfa0 | 4653 | |
3de9fb4c DJ |
4654 | ERROR("Failed to get group record - %u", getegid()); |
4655 | free(buf); | |
97e9cfa0 | 4656 | return NULL; |
3de9fb4c DJ |
4657 | } |
4658 | ||
4659 | grname = strdup(grent.gr_name); | |
4660 | free(buf); | |
97e9cfa0 | 4661 | |
3de9fb4c | 4662 | return grname; |
97e9cfa0 SH |
4663 | } |
4664 | ||
a96a8e8c | 4665 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4666 | void suggest_default_idmap(void) |
4667 | { | |
0fd73091 | 4668 | char *uname, *gname; |
97e9cfa0 SH |
4669 | FILE *f; |
4670 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; | |
97e9cfa0 | 4671 | size_t len = 0; |
0fd73091 | 4672 | char *line = NULL; |
97e9cfa0 | 4673 | |
0fd73091 CB |
4674 | uname = getuname(); |
4675 | if (!uname) | |
97e9cfa0 SH |
4676 | return; |
4677 | ||
0fd73091 CB |
4678 | gname = getgname(); |
4679 | if (!gname) { | |
97e9cfa0 SH |
4680 | free(uname); |
4681 | return; | |
4682 | } | |
4683 | ||
4684 | f = fopen(subuidfile, "r"); | |
4685 | if (!f) { | |
4686 | ERROR("Your system is not configured with subuids"); | |
4687 | free(gname); | |
4688 | free(uname); | |
4689 | return; | |
4690 | } | |
0fd73091 | 4691 | |
97e9cfa0 | 4692 | while (getline(&line, &len, 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, &uid) < 0) |
0fd73091 | 4718 | WARN("Could not parse UID"); |
b7b2fde4 | 4719 | if (lxc_safe_uint(p2, &urange) < 0) |
0fd73091 | 4720 | WARN("Could not parse UID range"); |
97e9cfa0 SH |
4721 | } |
4722 | fclose(f); | |
4723 | ||
6be7389a | 4724 | f = fopen(subgidfile, "r"); |
97e9cfa0 SH |
4725 | if (!f) { |
4726 | ERROR("Your system is not configured with subgids"); | |
4727 | free(gname); | |
4728 | free(uname); | |
4729 | return; | |
4730 | } | |
0fd73091 | 4731 | |
97e9cfa0 | 4732 | while (getline(&line, &len, f) != -1) { |
0fd73091 | 4733 | char *p, *p2; |
b7930180 | 4734 | size_t no_newline = 0; |
0fd73091 CB |
4735 | |
4736 | p = strchr(line, ':'); | |
97e9cfa0 SH |
4737 | if (*line == '#') |
4738 | continue; | |
4739 | if (!p) | |
4740 | continue; | |
4741 | *p = '\0'; | |
4742 | p++; | |
0fd73091 | 4743 | |
97e9cfa0 SH |
4744 | if (strcmp(line, uname)) |
4745 | continue; | |
0fd73091 | 4746 | |
97e9cfa0 SH |
4747 | p2 = strchr(p, ':'); |
4748 | if (!p2) | |
4749 | continue; | |
4750 | *p2 = '\0'; | |
4751 | p2++; | |
4752 | if (!*p2) | |
4753 | continue; | |
b7930180 CB |
4754 | no_newline = strcspn(p2, "\n"); |
4755 | p2[no_newline] = '\0'; | |
4756 | ||
b7b2fde4 | 4757 | if (lxc_safe_uint(p, &gid) < 0) |
0fd73091 | 4758 | WARN("Could not parse GID"); |
b7b2fde4 | 4759 | if (lxc_safe_uint(p2, &grange) < 0) |
0fd73091 | 4760 | WARN("Could not parse GID range"); |
97e9cfa0 SH |
4761 | } |
4762 | fclose(f); | |
4763 | ||
f10fad2f | 4764 | free(line); |
97e9cfa0 SH |
4765 | |
4766 | if (!urange || !grange) { | |
4767 | ERROR("You do not have subuids or subgids allocated"); | |
4768 | ERROR("Unprivileged containers require subuids and subgids"); | |
fbd4a4d1 | 4769 | free(uname); |
1e7cd2f7 | 4770 | free(gname); |
97e9cfa0 SH |
4771 | return; |
4772 | } | |
4773 | ||
4774 | ERROR("You must either run as root, or define uid mappings"); | |
4775 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4776 | ERROR("~/.config/lxc/default.conf:"); | |
4777 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
bdcbb6b3 CB |
4778 | ERROR("lxc.idmap = u 0 %u %u", uid, urange); |
4779 | ERROR("lxc.idmap = g 0 %u %u", gid, grange); | |
97e9cfa0 SH |
4780 | |
4781 | free(gname); | |
4782 | free(uname); | |
4783 | } | |
aaf26830 | 4784 | |
a7307747 SH |
4785 | static void free_cgroup_settings(struct lxc_list *result) |
4786 | { | |
4787 | struct lxc_list *iterator, *next; | |
4788 | ||
0fd73091 | 4789 | lxc_list_for_each_safe (iterator, result, next) { |
a7307747 SH |
4790 | lxc_list_del(iterator); |
4791 | free(iterator); | |
4792 | } | |
4793 | free(result); | |
4794 | } | |
4795 | ||
0fd73091 | 4796 | /* Return the list of cgroup_settings sorted according to the following rules |
aaf26830 KT |
4797 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes |
4798 | */ | |
0fd73091 | 4799 | struct lxc_list *sort_cgroup_settings(struct lxc_list *cgroup_settings) |
aaf26830 KT |
4800 | { |
4801 | struct lxc_list *result; | |
aaf26830 | 4802 | struct lxc_cgroup *cg = NULL; |
0fd73091 | 4803 | struct lxc_list *it = NULL, *item = NULL, *memsw_limit = NULL; |
aaf26830 KT |
4804 | |
4805 | result = malloc(sizeof(*result)); | |
0fd73091 | 4806 | if (!result) |
fac7c663 | 4807 | return NULL; |
aaf26830 KT |
4808 | lxc_list_init(result); |
4809 | ||
0fd73091 CB |
4810 | /* Iterate over the cgroup settings and copy them to the output list. */ |
4811 | lxc_list_for_each (it, cgroup_settings) { | |
aaf26830 | 4812 | item = malloc(sizeof(*item)); |
fac7c663 | 4813 | if (!item) { |
a7307747 | 4814 | free_cgroup_settings(result); |
fac7c663 KT |
4815 | return NULL; |
4816 | } | |
0fd73091 | 4817 | |
aaf26830 KT |
4818 | item->elem = it->elem; |
4819 | cg = it->elem; | |
4820 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
4821 | /* Store the memsw_limit location */ | |
4822 | memsw_limit = item; | |
0fd73091 CB |
4823 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && |
4824 | memsw_limit != NULL) { | |
4825 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found | |
4826 | * before lxc.cgroup.memory.limit_in_bytes, swap these | |
4827 | * two items */ | |
aaf26830 KT |
4828 | item->elem = memsw_limit->elem; |
4829 | memsw_limit->elem = it->elem; | |
4830 | } | |
4831 | lxc_list_add_tail(result, item); | |
4832 | } | |
4833 | ||
4834 | return result; | |
a7307747 | 4835 | } |