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Commit | Line | Data |
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0ad19a3f | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
0ad19a3f | 8 | * |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
0ad19a3f | 22 | */ |
1d52bdf7 CB |
23 | |
24 | #define _GNU_SOURCE | |
d06245b8 NC |
25 | #include "config.h" |
26 | ||
8f3e280e CB |
27 | #include <dirent.h> |
28 | #include <errno.h> | |
29 | #include <fcntl.h> | |
30 | #include <grp.h> | |
31 | #include <inttypes.h> | |
32 | #include <libgen.h> | |
33 | #include <pwd.h> | |
34 | #include <stdarg.h> | |
0ad19a3f | 35 | #include <stdio.h> |
0ad19a3f | 36 | #include <stdlib.h> |
0ad19a3f | 37 | #include <string.h> |
8f3e280e | 38 | #include <time.h> |
0ad19a3f | 39 | #include <unistd.h> |
8f3e280e CB |
40 | #include <arpa/inet.h> |
41 | #include <linux/loop.h> | |
8f3e280e CB |
42 | #include <net/if.h> |
43 | #include <netinet/in.h> | |
44 | #include <sys/mman.h> | |
45 | #include <sys/mount.h> | |
46 | #include <sys/param.h> | |
47 | #include <sys/prctl.h> | |
48 | #include <sys/stat.h> | |
49 | #include <sys/socket.h> | |
ce831b3b | 50 | #include <sys/sysmacros.h> |
2d76d1d7 | 51 | #include <sys/syscall.h> |
97e9cfa0 | 52 | #include <sys/types.h> |
8f3e280e CB |
53 | #include <sys/utsname.h> |
54 | #include <sys/wait.h> | |
1d52bdf7 | 55 | |
af6824fc ST |
56 | /* makedev() */ |
57 | #ifdef MAJOR_IN_MKDEV | |
58 | # include <sys/mkdev.h> | |
59 | #endif | |
af6824fc | 60 | |
614305f3 | 61 | #ifdef HAVE_STATVFS |
2938f7c8 | 62 | #include <sys/statvfs.h> |
614305f3 | 63 | #endif |
e827ff7e SG |
64 | |
65 | #if HAVE_PTY_H | |
b0a33c1e | 66 | #include <pty.h> |
e827ff7e SG |
67 | #else |
68 | #include <../include/openpty.h> | |
69 | #endif | |
0ad19a3f | 70 | |
5ef5c9a3 CB |
71 | #ifdef HAVE_LINUX_MEMFD_H |
72 | #include <linux/memfd.h> | |
73 | #endif | |
74 | ||
e8bd4e43 | 75 | #include "af_unix.h" |
8f3e280e CB |
76 | #include "bdev.h" |
77 | #include "caps.h" /* for lxc_caps_last_cap() */ | |
78 | #include "cgroup.h" | |
1b09f2c0 | 79 | #include "conf.h" |
1ed6ba91 | 80 | #include "confile_utils.h" |
8f3e280e | 81 | #include "error.h" |
1b09f2c0 | 82 | #include "log.h" |
d8e48992 | 83 | #include "lxcaufs.h" |
025ed0f3 | 84 | #include "lxclock.h" |
8f3e280e CB |
85 | #include "lxcoverlay.h" |
86 | #include "lxcseccomp.h" | |
4355ab5f | 87 | #include "namespace.h" |
8f3e280e CB |
88 | #include "network.h" |
89 | #include "parse.h" | |
90 | #include "utils.h" | |
fe4de9a6 | 91 | #include "lsm/lsm.h" |
d0a36f2c | 92 | |
e37dda71 | 93 | #if HAVE_LIBCAP |
495d2046 SG |
94 | #include <sys/capability.h> |
95 | #endif | |
96 | ||
6ff05e18 SG |
97 | #if HAVE_SYS_PERSONALITY_H |
98 | #include <sys/personality.h> | |
99 | #endif | |
100 | ||
edaf8b1b SG |
101 | #if IS_BIONIC |
102 | #include <../include/lxcmntent.h> | |
a04f5407 CB |
103 | #ifndef HAVE_PRLIMIT |
104 | #include <../include/prlimit.h> | |
105 | #endif | |
edaf8b1b SG |
106 | #else |
107 | #include <mntent.h> | |
108 | #endif | |
109 | ||
36eb9bde | 110 | lxc_log_define(lxc_conf, lxc); |
e5bda9ee | 111 | |
e37dda71 | 112 | #if HAVE_LIBCAP |
b09094da MN |
113 | #ifndef CAP_SETFCAP |
114 | #define CAP_SETFCAP 31 | |
115 | #endif | |
116 | ||
117 | #ifndef CAP_MAC_OVERRIDE | |
118 | #define CAP_MAC_OVERRIDE 32 | |
119 | #endif | |
120 | ||
121 | #ifndef CAP_MAC_ADMIN | |
122 | #define CAP_MAC_ADMIN 33 | |
123 | #endif | |
495d2046 | 124 | #endif |
b09094da MN |
125 | |
126 | #ifndef PR_CAPBSET_DROP | |
127 | #define PR_CAPBSET_DROP 24 | |
128 | #endif | |
129 | ||
9818cae4 SG |
130 | #ifndef LO_FLAGS_AUTOCLEAR |
131 | #define LO_FLAGS_AUTOCLEAR 4 | |
132 | #endif | |
133 | ||
bc5b27d6 DK |
134 | #ifndef CAP_SETUID |
135 | #define CAP_SETUID 7 | |
136 | #endif | |
137 | ||
138 | #ifndef CAP_SETGID | |
139 | #define CAP_SETGID 6 | |
140 | #endif | |
141 | ||
0769b82a CS |
142 | /* needed for cgroup automount checks, regardless of whether we |
143 | * have included linux/capability.h or not */ | |
144 | #ifndef CAP_SYS_ADMIN | |
145 | #define CAP_SYS_ADMIN 21 | |
146 | #endif | |
147 | ||
2d76d1d7 SG |
148 | /* Define pivot_root() if missing from the C library */ |
149 | #ifndef HAVE_PIVOT_ROOT | |
150 | static int pivot_root(const char * new_root, const char * put_old) | |
151 | { | |
152 | #ifdef __NR_pivot_root | |
8f3e280e | 153 | return syscall(__NR_pivot_root, new_root, put_old); |
2d76d1d7 | 154 | #else |
8f3e280e CB |
155 | errno = ENOSYS; |
156 | return -1; | |
2d76d1d7 SG |
157 | #endif |
158 | } | |
159 | #else | |
160 | extern int pivot_root(const char * new_root, const char * put_old); | |
161 | #endif | |
162 | ||
163 | /* Define sethostname() if missing from the C library */ | |
164 | #ifndef HAVE_SETHOSTNAME | |
165 | static int sethostname(const char * name, size_t len) | |
166 | { | |
167 | #ifdef __NR_sethostname | |
8f3e280e | 168 | return syscall(__NR_sethostname, name, len); |
2d76d1d7 | 169 | #else |
8f3e280e CB |
170 | errno = ENOSYS; |
171 | return -1; | |
2d76d1d7 SG |
172 | #endif |
173 | } | |
174 | #endif | |
175 | ||
ecec0126 SG |
176 | #ifndef MS_PRIVATE |
177 | #define MS_PRIVATE (1<<18) | |
178 | #endif | |
179 | ||
8912711c CB |
180 | #ifndef MS_LAZYTIME |
181 | #define MS_LAZYTIME (1<<25) | |
182 | #endif | |
183 | ||
5ef5c9a3 CB |
184 | /* memfd_create() */ |
185 | #ifndef MFD_CLOEXEC | |
186 | #define MFD_CLOEXEC 0x0001U | |
187 | #endif | |
188 | ||
189 | #ifndef MFD_ALLOW_SEALING | |
190 | #define MFD_ALLOW_SEALING 0x0002U | |
191 | #endif | |
192 | ||
193 | #ifndef HAVE_MEMFD_CREATE | |
194 | static int memfd_create(const char *name, unsigned int flags) { | |
195 | #ifndef __NR_memfd_create | |
196 | #if defined __i386__ | |
197 | #define __NR_memfd_create 356 | |
198 | #elif defined __x86_64__ | |
199 | #define __NR_memfd_create 319 | |
200 | #elif defined __arm__ | |
201 | #define __NR_memfd_create 385 | |
202 | #elif defined __aarch64__ | |
203 | #define __NR_memfd_create 279 | |
204 | #elif defined __s390__ | |
205 | #define __NR_memfd_create 350 | |
206 | #elif defined __powerpc__ | |
207 | #define __NR_memfd_create 360 | |
208 | #elif defined __sparc__ | |
209 | #define __NR_memfd_create 348 | |
210 | #elif defined __blackfin__ | |
211 | #define __NR_memfd_create 390 | |
212 | #elif defined __ia64__ | |
213 | #define __NR_memfd_create 1340 | |
214 | #elif defined _MIPS_SIM | |
215 | #if _MIPS_SIM == _MIPS_SIM_ABI32 | |
216 | #define __NR_memfd_create 4354 | |
217 | #endif | |
218 | #if _MIPS_SIM == _MIPS_SIM_NABI32 | |
219 | #define __NR_memfd_create 6318 | |
220 | #endif | |
221 | #if _MIPS_SIM == _MIPS_SIM_ABI64 | |
222 | #define __NR_memfd_create 5314 | |
223 | #endif | |
224 | #endif | |
225 | #endif | |
226 | #ifdef __NR_memfd_create | |
227 | return syscall(__NR_memfd_create, name, flags); | |
228 | #else | |
229 | errno = ENOSYS; | |
230 | return -1; | |
231 | #endif | |
232 | } | |
233 | #else | |
234 | extern int memfd_create(const char *name, unsigned int flags); | |
235 | #endif | |
236 | ||
2b9ae35a CB |
237 | char *lxchook_names[NUM_LXC_HOOKS] = {"pre-start", "pre-mount", "mount", |
238 | "autodev", "start", "stop", | |
239 | "post-stop", "clone", "destroy"}; | |
72d0e1cb | 240 | |
a589434e | 241 | typedef int (*instantiate_cb)(struct lxc_handler *, struct lxc_netdev *); |
0ad19a3f | 242 | |
998ac676 RT |
243 | struct mount_opt { |
244 | char *name; | |
245 | int clear; | |
246 | int flag; | |
247 | }; | |
248 | ||
81810dd1 DL |
249 | struct caps_opt { |
250 | char *name; | |
251 | int value; | |
252 | }; | |
253 | ||
c6d09e15 WB |
254 | struct limit_opt { |
255 | char *name; | |
256 | int value; | |
257 | }; | |
258 | ||
858377e4 SH |
259 | /* |
260 | * The lxc_conf of the container currently being worked on in an | |
261 | * API call | |
262 | * This is used in the error calls | |
263 | */ | |
264 | #ifdef HAVE_TLS | |
265 | __thread struct lxc_conf *current_config; | |
266 | #else | |
267 | struct lxc_conf *current_config; | |
268 | #endif | |
269 | ||
0769b82a CS |
270 | /* Declare this here, since we don't want to reshuffle the whole file. */ |
271 | static int in_caplist(int cap, struct lxc_list *caps); | |
272 | ||
a589434e JN |
273 | static int instantiate_veth(struct lxc_handler *, struct lxc_netdev *); |
274 | static int instantiate_macvlan(struct lxc_handler *, struct lxc_netdev *); | |
275 | static int instantiate_vlan(struct lxc_handler *, struct lxc_netdev *); | |
276 | static int instantiate_phys(struct lxc_handler *, struct lxc_netdev *); | |
277 | static int instantiate_empty(struct lxc_handler *, struct lxc_netdev *); | |
278 | static int instantiate_none(struct lxc_handler *, struct lxc_netdev *); | |
279 | ||
280 | static instantiate_cb netdev_conf[LXC_NET_MAXCONFTYPE + 1] = { | |
281 | [LXC_NET_VETH] = instantiate_veth, | |
282 | [LXC_NET_MACVLAN] = instantiate_macvlan, | |
283 | [LXC_NET_VLAN] = instantiate_vlan, | |
284 | [LXC_NET_PHYS] = instantiate_phys, | |
285 | [LXC_NET_EMPTY] = instantiate_empty, | |
286 | [LXC_NET_NONE] = instantiate_none, | |
0ad19a3f | 287 | }; |
288 | ||
74a2b586 JK |
289 | static int shutdown_veth(struct lxc_handler *, struct lxc_netdev *); |
290 | static int shutdown_macvlan(struct lxc_handler *, struct lxc_netdev *); | |
291 | static int shutdown_vlan(struct lxc_handler *, struct lxc_netdev *); | |
292 | static int shutdown_phys(struct lxc_handler *, struct lxc_netdev *); | |
293 | static int shutdown_empty(struct lxc_handler *, struct lxc_netdev *); | |
26b797f3 | 294 | static int shutdown_none(struct lxc_handler *, struct lxc_netdev *); |
74a2b586 | 295 | |
a589434e | 296 | static instantiate_cb netdev_deconf[LXC_NET_MAXCONFTYPE + 1] = { |
74a2b586 JK |
297 | [LXC_NET_VETH] = shutdown_veth, |
298 | [LXC_NET_MACVLAN] = shutdown_macvlan, | |
299 | [LXC_NET_VLAN] = shutdown_vlan, | |
300 | [LXC_NET_PHYS] = shutdown_phys, | |
301 | [LXC_NET_EMPTY] = shutdown_empty, | |
26b797f3 | 302 | [LXC_NET_NONE] = shutdown_none, |
74a2b586 JK |
303 | }; |
304 | ||
998ac676 | 305 | static struct mount_opt mount_opt[] = { |
470b359b CB |
306 | { "async", 1, MS_SYNCHRONOUS }, |
307 | { "atime", 1, MS_NOATIME }, | |
308 | { "bind", 0, MS_BIND }, | |
88d413d5 | 309 | { "defaults", 0, 0 }, |
88d413d5 | 310 | { "dev", 1, MS_NODEV }, |
470b359b | 311 | { "diratime", 1, MS_NODIRATIME }, |
88d413d5 | 312 | { "dirsync", 0, MS_DIRSYNC }, |
470b359b | 313 | { "exec", 1, MS_NOEXEC }, |
8912711c | 314 | { "lazytime", 0, MS_LAZYTIME }, |
88d413d5 | 315 | { "mand", 0, MS_MANDLOCK }, |
88d413d5 | 316 | { "noatime", 0, MS_NOATIME }, |
470b359b | 317 | { "nodev", 0, MS_NODEV }, |
88d413d5 | 318 | { "nodiratime", 0, MS_NODIRATIME }, |
470b359b CB |
319 | { "noexec", 0, MS_NOEXEC }, |
320 | { "nomand", 1, MS_MANDLOCK }, | |
321 | { "norelatime", 1, MS_RELATIME }, | |
322 | { "nostrictatime", 1, MS_STRICTATIME }, | |
323 | { "nosuid", 0, MS_NOSUID }, | |
88d413d5 SW |
324 | { "rbind", 0, MS_BIND|MS_REC }, |
325 | { "relatime", 0, MS_RELATIME }, | |
470b359b CB |
326 | { "remount", 0, MS_REMOUNT }, |
327 | { "ro", 0, MS_RDONLY }, | |
328 | { "rw", 1, MS_RDONLY }, | |
88d413d5 | 329 | { "strictatime", 0, MS_STRICTATIME }, |
470b359b CB |
330 | { "suid", 1, MS_NOSUID }, |
331 | { "sync", 0, MS_SYNCHRONOUS }, | |
88d413d5 | 332 | { NULL, 0, 0 }, |
998ac676 RT |
333 | }; |
334 | ||
e37dda71 | 335 | #if HAVE_LIBCAP |
81810dd1 | 336 | static struct caps_opt caps_opt[] = { |
a6afdde9 | 337 | { "chown", CAP_CHOWN }, |
1e11be34 DL |
338 | { "dac_override", CAP_DAC_OVERRIDE }, |
339 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
340 | { "fowner", CAP_FOWNER }, | |
341 | { "fsetid", CAP_FSETID }, | |
81810dd1 DL |
342 | { "kill", CAP_KILL }, |
343 | { "setgid", CAP_SETGID }, | |
344 | { "setuid", CAP_SETUID }, | |
345 | { "setpcap", CAP_SETPCAP }, | |
346 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
347 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
348 | { "net_broadcast", CAP_NET_BROADCAST }, | |
349 | { "net_admin", CAP_NET_ADMIN }, | |
350 | { "net_raw", CAP_NET_RAW }, | |
351 | { "ipc_lock", CAP_IPC_LOCK }, | |
352 | { "ipc_owner", CAP_IPC_OWNER }, | |
353 | { "sys_module", CAP_SYS_MODULE }, | |
354 | { "sys_rawio", CAP_SYS_RAWIO }, | |
355 | { "sys_chroot", CAP_SYS_CHROOT }, | |
356 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
357 | { "sys_pacct", CAP_SYS_PACCT }, | |
358 | { "sys_admin", CAP_SYS_ADMIN }, | |
359 | { "sys_boot", CAP_SYS_BOOT }, | |
360 | { "sys_nice", CAP_SYS_NICE }, | |
361 | { "sys_resource", CAP_SYS_RESOURCE }, | |
362 | { "sys_time", CAP_SYS_TIME }, | |
363 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
364 | { "mknod", CAP_MKNOD }, | |
365 | { "lease", CAP_LEASE }, | |
57b837e2 CB |
366 | #ifdef CAP_AUDIT_READ |
367 | { "audit_read", CAP_AUDIT_READ }, | |
368 | #endif | |
9527e566 | 369 | #ifdef CAP_AUDIT_WRITE |
81810dd1 | 370 | { "audit_write", CAP_AUDIT_WRITE }, |
9527e566 FW |
371 | #endif |
372 | #ifdef CAP_AUDIT_CONTROL | |
81810dd1 | 373 | { "audit_control", CAP_AUDIT_CONTROL }, |
9527e566 | 374 | #endif |
81810dd1 DL |
375 | { "setfcap", CAP_SETFCAP }, |
376 | { "mac_override", CAP_MAC_OVERRIDE }, | |
377 | { "mac_admin", CAP_MAC_ADMIN }, | |
5170c716 CS |
378 | #ifdef CAP_SYSLOG |
379 | { "syslog", CAP_SYSLOG }, | |
380 | #endif | |
381 | #ifdef CAP_WAKE_ALARM | |
382 | { "wake_alarm", CAP_WAKE_ALARM }, | |
383 | #endif | |
2b54359b CB |
384 | #ifdef CAP_BLOCK_SUSPEND |
385 | { "block_suspend", CAP_BLOCK_SUSPEND }, | |
386 | #endif | |
81810dd1 | 387 | }; |
495d2046 SG |
388 | #else |
389 | static struct caps_opt caps_opt[] = {}; | |
390 | #endif | |
81810dd1 | 391 | |
c6d09e15 WB |
392 | static struct limit_opt limit_opt[] = { |
393 | #ifdef RLIMIT_AS | |
394 | { "as", RLIMIT_AS }, | |
395 | #endif | |
396 | #ifdef RLIMIT_CORE | |
397 | { "core", RLIMIT_CORE }, | |
398 | #endif | |
399 | #ifdef RLIMIT_CPU | |
400 | { "cpu", RLIMIT_CPU }, | |
401 | #endif | |
402 | #ifdef RLIMIT_DATA | |
403 | { "data", RLIMIT_DATA }, | |
404 | #endif | |
405 | #ifdef RLIMIT_FSIZE | |
406 | { "fsize", RLIMIT_FSIZE }, | |
407 | #endif | |
408 | #ifdef RLIMIT_LOCKS | |
409 | { "locks", RLIMIT_LOCKS }, | |
410 | #endif | |
411 | #ifdef RLIMIT_MEMLOCK | |
412 | { "memlock", RLIMIT_MEMLOCK }, | |
413 | #endif | |
414 | #ifdef RLIMIT_MSGQUEUE | |
415 | { "msgqueue", RLIMIT_MSGQUEUE }, | |
416 | #endif | |
417 | #ifdef RLIMIT_NICE | |
418 | { "nice", RLIMIT_NICE }, | |
419 | #endif | |
420 | #ifdef RLIMIT_NOFILE | |
421 | { "nofile", RLIMIT_NOFILE }, | |
422 | #endif | |
423 | #ifdef RLIMIT_NPROC | |
424 | { "nproc", RLIMIT_NPROC }, | |
425 | #endif | |
426 | #ifdef RLIMIT_RSS | |
427 | { "rss", RLIMIT_RSS }, | |
428 | #endif | |
429 | #ifdef RLIMIT_RTPRIO | |
430 | { "rtprio", RLIMIT_RTPRIO }, | |
431 | #endif | |
432 | #ifdef RLIMIT_RTTIME | |
433 | { "rttime", RLIMIT_RTTIME }, | |
434 | #endif | |
435 | #ifdef RLIMIT_SIGPENDING | |
436 | { "sigpending", RLIMIT_SIGPENDING }, | |
437 | #endif | |
438 | #ifdef RLIMIT_STACK | |
439 | { "stack", RLIMIT_STACK }, | |
440 | #endif | |
441 | }; | |
442 | ||
91c3830e SH |
443 | static int run_buffer(char *buffer) |
444 | { | |
ebec9176 | 445 | struct lxc_popen_FILE *f; |
91c3830e | 446 | char *output; |
8e7da691 | 447 | int ret; |
91c3830e | 448 | |
ebec9176 | 449 | f = lxc_popen(buffer); |
91c3830e | 450 | if (!f) { |
062b72c6 | 451 | SYSERROR("Failed to popen() %s.", buffer); |
91c3830e SH |
452 | return -1; |
453 | } | |
454 | ||
455 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
456 | if (!output) { | |
062b72c6 | 457 | ERROR("Failed to allocate memory for %s.", buffer); |
ebec9176 | 458 | lxc_pclose(f); |
91c3830e SH |
459 | return -1; |
460 | } | |
461 | ||
062b72c6 CB |
462 | while (fgets(output, LXC_LOG_BUFFER_SIZE, f->f)) |
463 | DEBUG("Script %s with output: %s.", buffer, output); | |
91c3830e SH |
464 | |
465 | free(output); | |
466 | ||
ebec9176 | 467 | ret = lxc_pclose(f); |
8e7da691 | 468 | if (ret == -1) { |
062b72c6 | 469 | SYSERROR("Script exited with error."); |
91c3830e | 470 | return -1; |
8e7da691 | 471 | } else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) { |
062b72c6 | 472 | ERROR("Script exited with status %d.", WEXITSTATUS(ret)); |
8e7da691 DE |
473 | return -1; |
474 | } else if (WIFSIGNALED(ret)) { | |
062b72c6 | 475 | ERROR("Script terminated by signal %d.", WTERMSIG(ret)); |
8e7da691 | 476 | return -1; |
91c3830e SH |
477 | } |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
148e91f5 | 482 | static int run_script_argv(const char *name, const char *section, |
062b72c6 CB |
483 | const char *script, const char *hook, |
484 | const char *lxcpath, char **argsin) | |
148e91f5 SH |
485 | { |
486 | int ret, i; | |
487 | char *buffer; | |
488 | size_t size = 0; | |
489 | ||
062b72c6 | 490 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\".", |
148e91f5 SH |
491 | script, name, section); |
492 | ||
062b72c6 | 493 | for (i = 0; argsin && argsin[i]; i++) |
148e91f5 SH |
494 | size += strlen(argsin[i]) + 1; |
495 | ||
496 | size += strlen(hook) + 1; | |
497 | ||
498 | size += strlen(script); | |
499 | size += strlen(name); | |
500 | size += strlen(section); | |
501 | size += 3; | |
502 | ||
503 | if (size > INT_MAX) | |
504 | return -1; | |
505 | ||
506 | buffer = alloca(size); | |
507 | if (!buffer) { | |
062b72c6 | 508 | ERROR("Failed to allocate memory."); |
148e91f5 SH |
509 | return -1; |
510 | } | |
511 | ||
062b72c6 CB |
512 | ret = |
513 | snprintf(buffer, size, "%s %s %s %s", script, name, section, hook); | |
514 | if (ret < 0 || (size_t)ret >= size) { | |
515 | ERROR("Script name too long."); | |
148e91f5 SH |
516 | return -1; |
517 | } | |
518 | ||
062b72c6 CB |
519 | for (i = 0; argsin && argsin[i]; i++) { |
520 | int len = size - ret; | |
148e91f5 SH |
521 | int rc; |
522 | rc = snprintf(buffer + ret, len, " %s", argsin[i]); | |
523 | if (rc < 0 || rc >= len) { | |
062b72c6 | 524 | ERROR("Script args too long."); |
148e91f5 SH |
525 | return -1; |
526 | } | |
527 | ret += rc; | |
528 | } | |
529 | ||
530 | return run_buffer(buffer); | |
531 | } | |
532 | ||
062b72c6 CB |
533 | static int run_script(const char *name, const char *section, const char *script, |
534 | ...) | |
e3b4c4c4 | 535 | { |
abbfd20b | 536 | int ret; |
91c3830e | 537 | char *buffer, *p; |
abbfd20b DL |
538 | size_t size = 0; |
539 | va_list ap; | |
751d9dcd | 540 | |
062b72c6 | 541 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\".", |
751d9dcd | 542 | script, name, section); |
e3b4c4c4 | 543 | |
abbfd20b DL |
544 | va_start(ap, script); |
545 | while ((p = va_arg(ap, char *))) | |
95642a10 | 546 | size += strlen(p) + 1; |
abbfd20b DL |
547 | va_end(ap); |
548 | ||
549 | size += strlen(script); | |
550 | size += strlen(name); | |
551 | size += strlen(section); | |
95642a10 | 552 | size += 3; |
abbfd20b | 553 | |
95642a10 MS |
554 | if (size > INT_MAX) |
555 | return -1; | |
556 | ||
557 | buffer = alloca(size); | |
abbfd20b | 558 | if (!buffer) { |
062b72c6 | 559 | ERROR("Failed to allocate memory."); |
751d9dcd DL |
560 | return -1; |
561 | } | |
562 | ||
9ba8130c SH |
563 | ret = snprintf(buffer, size, "%s %s %s", script, name, section); |
564 | if (ret < 0 || ret >= size) { | |
062b72c6 | 565 | ERROR("Script name too long."); |
9ba8130c SH |
566 | return -1; |
567 | } | |
751d9dcd | 568 | |
abbfd20b | 569 | va_start(ap, script); |
9ba8130c | 570 | while ((p = va_arg(ap, char *))) { |
062b72c6 | 571 | int len = size - ret; |
9ba8130c SH |
572 | int rc; |
573 | rc = snprintf(buffer + ret, len, " %s", p); | |
574 | if (rc < 0 || rc >= len) { | |
062b72c6 | 575 | ERROR("Script args too long."); |
9ba8130c SH |
576 | return -1; |
577 | } | |
578 | ret += rc; | |
579 | } | |
abbfd20b | 580 | va_end(ap); |
751d9dcd | 581 | |
91c3830e | 582 | return run_buffer(buffer); |
e3b4c4c4 ST |
583 | } |
584 | ||
0c547523 SH |
585 | /* |
586 | * pin_rootfs | |
b7ed4bf0 CS |
587 | * if rootfs is a directory, then open ${rootfs}/lxc.hold for writing for |
588 | * the duration of the container run, to prevent the container from marking | |
589 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
590 | * no name pollution is happens | |
0c547523 SH |
591 | * return -1 on error. |
592 | * return -2 if nothing needed to be pinned. | |
593 | * return an open fd (>=0) if we pinned it. | |
594 | */ | |
595 | int pin_rootfs(const char *rootfs) | |
596 | { | |
597 | char absrootfs[MAXPATHLEN]; | |
598 | char absrootfspin[MAXPATHLEN]; | |
599 | struct stat s; | |
600 | int ret, fd; | |
601 | ||
e99ee0de | 602 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 603 | return -2; |
e99ee0de | 604 | |
00ec333b | 605 | if (!realpath(rootfs, absrootfs)) |
9be53773 | 606 | return -2; |
0c547523 | 607 | |
00ec333b | 608 | if (access(absrootfs, F_OK)) |
0c547523 | 609 | return -1; |
0c547523 | 610 | |
00ec333b | 611 | if (stat(absrootfs, &s)) |
0c547523 | 612 | return -1; |
0c547523 | 613 | |
72f919c4 | 614 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
615 | return -2; |
616 | ||
b7ed4bf0 | 617 | ret = snprintf(absrootfspin, MAXPATHLEN, "%s/lxc.hold", absrootfs); |
00ec333b | 618 | if (ret >= MAXPATHLEN) |
0c547523 | 619 | return -1; |
0c547523 SH |
620 | |
621 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR|S_IRUSR); | |
b7ed4bf0 CS |
622 | if (fd < 0) |
623 | return fd; | |
624 | (void)unlink(absrootfspin); | |
0c547523 SH |
625 | return fd; |
626 | } | |
627 | ||
e2a7e8dc SH |
628 | /* |
629 | * If we are asking to remount something, make sure that any | |
630 | * NOEXEC etc are honored. | |
631 | */ | |
5ae72b98 | 632 | unsigned long add_required_remount_flags(const char *s, const char *d, |
e2a7e8dc SH |
633 | unsigned long flags) |
634 | { | |
614305f3 | 635 | #ifdef HAVE_STATVFS |
e2a7e8dc SH |
636 | struct statvfs sb; |
637 | unsigned long required_flags = 0; | |
638 | ||
639 | if (!(flags & MS_REMOUNT)) | |
640 | return flags; | |
641 | ||
642 | if (!s) | |
643 | s = d; | |
644 | ||
645 | if (!s) | |
646 | return flags; | |
647 | if (statvfs(s, &sb) < 0) | |
648 | return flags; | |
649 | ||
650 | if (sb.f_flag & MS_NOSUID) | |
651 | required_flags |= MS_NOSUID; | |
652 | if (sb.f_flag & MS_NODEV) | |
653 | required_flags |= MS_NODEV; | |
654 | if (sb.f_flag & MS_RDONLY) | |
655 | required_flags |= MS_RDONLY; | |
656 | if (sb.f_flag & MS_NOEXEC) | |
657 | required_flags |= MS_NOEXEC; | |
658 | ||
659 | return flags | required_flags; | |
614305f3 SH |
660 | #else |
661 | return flags; | |
662 | #endif | |
e2a7e8dc SH |
663 | } |
664 | ||
4fb3cba5 | 665 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 666 | { |
368bbc02 | 667 | int r; |
80e80c40 | 668 | int i; |
b06b8511 CS |
669 | static struct { |
670 | int match_mask; | |
671 | int match_flag; | |
672 | const char *source; | |
673 | const char *destination; | |
674 | const char *fstype; | |
675 | unsigned long flags; | |
676 | const char *options; | |
677 | } default_mounts[] = { | |
678 | /* Read-only bind-mounting... In older kernels, doing that required | |
679 | * to do one MS_BIND mount and then MS_REMOUNT|MS_RDONLY the same | |
680 | * one. According to mount(2) manpage, MS_BIND honors MS_RDONLY from | |
681 | * kernel 2.6.26 onwards. However, this apparently does not work on | |
682 | * kernel 3.8. Unfortunately, on that very same kernel, doing the | |
683 | * same trick as above doesn't seem to work either, there one needs | |
684 | * to ALSO specify MS_BIND for the remount, otherwise the entire | |
685 | * fs is remounted read-only or the mount fails because it's busy... | |
686 | * MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for kernels as low as | |
687 | * 2.6.32... | |
368bbc02 | 688 | */ |
f24a52d5 | 689 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
592fd47a SH |
690 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
691 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL }, | |
f24a52d5 SG |
692 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, |
693 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
592fd47a | 694 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL }, |
f24a52d5 SG |
695 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, |
696 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
697 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
698 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
699 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
700 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
701 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys", "%r/sys", NULL, MS_BIND, NULL }, | |
702 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
703 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
704 | { 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 }, | |
705 | { 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 }, | |
706 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 707 | }; |
368bbc02 | 708 | |
b06b8511 CS |
709 | for (i = 0; default_mounts[i].match_mask; i++) { |
710 | if ((flags & default_mounts[i].match_mask) == default_mounts[i].match_flag) { | |
711 | char *source = NULL; | |
712 | char *destination = NULL; | |
713 | int saved_errno; | |
e2a7e8dc | 714 | unsigned long mflags; |
b06b8511 CS |
715 | |
716 | if (default_mounts[i].source) { | |
717 | /* will act like strdup if %r is not present */ | |
8ede5f4c | 718 | source = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].source); |
b06b8511 CS |
719 | if (!source) { |
720 | SYSERROR("memory allocation error"); | |
721 | return -1; | |
722 | } | |
723 | } | |
cc4fd506 SH |
724 | if (!default_mounts[i].destination) { |
725 | ERROR("BUG: auto mounts destination %d was NULL", i); | |
b2f44b4d | 726 | free(source); |
cc4fd506 SH |
727 | return -1; |
728 | } | |
729 | /* will act like strdup if %r is not present */ | |
730 | destination = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].destination); | |
731 | if (!destination) { | |
732 | saved_errno = errno; | |
733 | SYSERROR("memory allocation error"); | |
734 | free(source); | |
735 | errno = saved_errno; | |
736 | return -1; | |
b06b8511 | 737 | } |
e2a7e8dc SH |
738 | mflags = add_required_remount_flags(source, destination, |
739 | default_mounts[i].flags); | |
592fd47a | 740 | r = safe_mount(source, destination, default_mounts[i].fstype, mflags, default_mounts[i].options, conf->rootfs.path ? conf->rootfs.mount : NULL); |
b06b8511 | 741 | saved_errno = errno; |
b88ff9a0 SG |
742 | if (r < 0 && errno == ENOENT) { |
743 | INFO("Mount source or target for %s on %s doesn't exist. Skipping.", source, destination); | |
744 | r = 0; | |
745 | } | |
746 | else if (r < 0) | |
e2a7e8dc | 747 | SYSERROR("error mounting %s on %s flags %lu", source, destination, mflags); |
f24a52d5 | 748 | |
b06b8511 CS |
749 | free(source); |
750 | free(destination); | |
751 | if (r < 0) { | |
b06b8511 CS |
752 | errno = saved_errno; |
753 | return -1; | |
754 | } | |
368bbc02 | 755 | } |
368bbc02 CS |
756 | } |
757 | ||
b06b8511 | 758 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
759 | int cg_flags; |
760 | ||
761 | cg_flags = flags & LXC_AUTO_CGROUP_MASK; | |
762 | /* If the type of cgroup mount was not specified, it depends on the | |
763 | * container's capabilities as to what makes sense: if we have | |
764 | * CAP_SYS_ADMIN, the read-only part can be remounted read-write | |
765 | * anyway, so we may as well default to read-write; then the admin | |
766 | * will not be given a false sense of security. (And if they really | |
767 | * want mixed r/o r/w, then they can explicitly specify :mixed.) | |
768 | * OTOH, if the container lacks CAP_SYS_ADMIN, do only default to | |
769 | * :mixed, because then the container can't remount it read-write. */ | |
770 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { | |
771 | int has_sys_admin = 0; | |
b0ee5983 CB |
772 | |
773 | if (!lxc_list_empty(&conf->keepcaps)) | |
0769b82a | 774 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); |
b0ee5983 | 775 | else |
0769b82a | 776 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); |
b0ee5983 CB |
777 | |
778 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) | |
0769b82a | 779 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; |
b0ee5983 | 780 | else |
0769b82a | 781 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; |
0769b82a CS |
782 | } |
783 | ||
8ede5f4c | 784 | if (!cgroup_mount(conf->rootfs.path ? conf->rootfs.mount : "", handler, cg_flags)) { |
368bbc02 | 785 | SYSERROR("error mounting /sys/fs/cgroup"); |
b06b8511 | 786 | return -1; |
368bbc02 CS |
787 | } |
788 | } | |
789 | ||
368bbc02 | 790 | return 0; |
368bbc02 CS |
791 | } |
792 | ||
4e5440c6 | 793 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 794 | { |
4e5440c6 DL |
795 | if (!utsname) |
796 | return 0; | |
0ad19a3f | 797 | |
4e5440c6 DL |
798 | if (sethostname(utsname->nodename, strlen(utsname->nodename))) { |
799 | SYSERROR("failed to set the hostname to '%s'", utsname->nodename); | |
0ad19a3f | 800 | return -1; |
801 | } | |
802 | ||
4e5440c6 | 803 | INFO("'%s' hostname has been setup", utsname->nodename); |
cd54d859 | 804 | |
0ad19a3f | 805 | return 0; |
806 | } | |
807 | ||
69aa6655 DE |
808 | struct dev_symlinks { |
809 | const char *oldpath; | |
810 | const char *name; | |
811 | }; | |
812 | ||
813 | static const struct dev_symlinks dev_symlinks[] = { | |
814 | {"/proc/self/fd", "fd"}, | |
815 | {"/proc/self/fd/0", "stdin"}, | |
816 | {"/proc/self/fd/1", "stdout"}, | |
817 | {"/proc/self/fd/2", "stderr"}, | |
818 | }; | |
819 | ||
820 | static int setup_dev_symlinks(const struct lxc_rootfs *rootfs) | |
821 | { | |
822 | char path[MAXPATHLEN]; | |
823 | int ret,i; | |
09227be2 | 824 | struct stat s; |
69aa6655 DE |
825 | |
826 | ||
827 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { | |
828 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
ec50007f | 829 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs->path ? rootfs->mount : "", d->name); |
69aa6655 DE |
830 | if (ret < 0 || ret >= MAXPATHLEN) |
831 | return -1; | |
09227be2 MW |
832 | |
833 | /* | |
834 | * Stat the path first. If we don't get an error | |
835 | * accept it as is and don't try to create it | |
836 | */ | |
837 | if (!stat(path, &s)) { | |
838 | continue; | |
839 | } | |
840 | ||
69aa6655 | 841 | ret = symlink(d->oldpath, path); |
09227be2 | 842 | |
69aa6655 | 843 | if (ret && errno != EEXIST) { |
09227be2 MW |
844 | if ( errno == EROFS ) { |
845 | WARN("Warning: Read Only file system while creating %s", path); | |
846 | } else { | |
847 | SYSERROR("Error creating %s", path); | |
848 | return -1; | |
849 | } | |
69aa6655 DE |
850 | } |
851 | } | |
852 | return 0; | |
853 | } | |
854 | ||
393903d1 SH |
855 | /* |
856 | * Build a space-separate list of ptys to pass to systemd. | |
857 | */ | |
858 | static bool append_ptyname(char **pp, char *name) | |
b0a33c1e | 859 | { |
393903d1 SH |
860 | char *p; |
861 | ||
862 | if (!*pp) { | |
863 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
864 | if (!*pp) | |
865 | return false; | |
866 | sprintf(*pp, "container_ttys=%s", name); | |
867 | return true; | |
868 | } | |
869 | p = realloc(*pp, strlen(*pp) + strlen(name) + 2); | |
870 | if (!p) | |
871 | return false; | |
872 | *pp = p; | |
873 | strcat(p, " "); | |
874 | strcat(p, name); | |
875 | return true; | |
876 | } | |
877 | ||
9e1045e3 | 878 | static int lxc_setup_tty(struct lxc_conf *conf) |
393903d1 | 879 | { |
9e1045e3 | 880 | int i, ret; |
393903d1 SH |
881 | const struct lxc_tty_info *tty_info = &conf->tty_info; |
882 | char *ttydir = conf->ttydir; | |
7c6ef2a2 | 883 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
b0a33c1e | 884 | |
e8bd4e43 | 885 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
886 | return 0; |
887 | ||
b0a33c1e | 888 | for (i = 0; i < tty_info->nbtty; i++) { |
b0a33c1e | 889 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; |
890 | ||
e8bd4e43 | 891 | ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1); |
9e1045e3 | 892 | if (ret < 0 || (size_t)ret >= sizeof(path)) { |
7c6ef2a2 SH |
893 | ERROR("pathname too long for ttys"); |
894 | return -1; | |
895 | } | |
9e1045e3 | 896 | |
7c6ef2a2 SH |
897 | if (ttydir) { |
898 | /* create dev/lxc/tty%d" */ | |
9e1045e3 CB |
899 | ret = snprintf(lxcpath, sizeof(lxcpath), |
900 | "/dev/%s/tty%d", ttydir, i + 1); | |
901 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) { | |
7c6ef2a2 SH |
902 | ERROR("pathname too long for ttys"); |
903 | return -1; | |
904 | } | |
9e1045e3 | 905 | |
7c6ef2a2 | 906 | ret = creat(lxcpath, 0660); |
9e1045e3 CB |
907 | if (ret < 0 && errno != EEXIST) { |
908 | SYSERROR("failed to create \"%s\"", lxcpath); | |
7c6ef2a2 SH |
909 | return -1; |
910 | } | |
4d44e274 SH |
911 | if (ret >= 0) |
912 | close(ret); | |
9e1045e3 | 913 | |
7c6ef2a2 | 914 | ret = unlink(path); |
9e1045e3 CB |
915 | if (ret < 0 && errno != ENOENT) { |
916 | SYSERROR("failed to unlink \"%s\"", path); | |
7c6ef2a2 SH |
917 | return -1; |
918 | } | |
b0a33c1e | 919 | |
9e1045e3 CB |
920 | ret = mount(pty_info->name, lxcpath, "none", MS_BIND, 0); |
921 | if (ret < 0) { | |
922 | WARN("failed to bind mount \"%s\" onto \"%s\"", | |
7c6ef2a2 SH |
923 | pty_info->name, path); |
924 | continue; | |
925 | } | |
9e1045e3 CB |
926 | DEBUG("bind mounted \"%s\" onto \"%s\"", pty_info->name, |
927 | path); | |
13954cce | 928 | |
9e1045e3 CB |
929 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", |
930 | ttydir, i + 1); | |
931 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) { | |
9ba8130c SH |
932 | ERROR("tty pathname too long"); |
933 | return -1; | |
934 | } | |
9e1045e3 | 935 | |
7c6ef2a2 | 936 | ret = symlink(lxcpath, path); |
9e1045e3 CB |
937 | if (ret < 0) { |
938 | SYSERROR("failed to create symlink \"%s\" -> \"%s\"", | |
939 | path, lxcpath); | |
7c6ef2a2 SH |
940 | return -1; |
941 | } | |
942 | } else { | |
9e1045e3 CB |
943 | /* If we populated /dev, then we need to create |
944 | * /dev/ttyN | |
945 | */ | |
946 | ret = access(path, F_OK); | |
947 | if (ret < 0) { | |
c6883f38 | 948 | ret = creat(path, 0660); |
9e1045e3 CB |
949 | if (ret < 0) { |
950 | SYSERROR("failed to create \"%s\"", path); | |
c6883f38 | 951 | /* this isn't fatal, continue */ |
025ed0f3 | 952 | } else { |
c6883f38 | 953 | close(ret); |
025ed0f3 | 954 | } |
c6883f38 | 955 | } |
9e1045e3 CB |
956 | |
957 | ret = mount(pty_info->name, path, "none", MS_BIND, 0); | |
958 | if (ret < 0) { | |
e8bd4e43 | 959 | SYSERROR("failed to mount '%s'->'%s'", pty_info->name, path); |
7c6ef2a2 SH |
960 | continue; |
961 | } | |
9e1045e3 CB |
962 | |
963 | DEBUG("bind mounted \"%s\" onto \"%s\"", pty_info->name, | |
964 | path); | |
393903d1 | 965 | } |
9e1045e3 | 966 | |
e8bd4e43 | 967 | if (!append_ptyname(&conf->pty_names, pty_info->name)) { |
393903d1 SH |
968 | ERROR("Error setting up container_ttys string"); |
969 | return -1; | |
b0a33c1e | 970 | } |
971 | } | |
972 | ||
9e1045e3 | 973 | INFO("finished setting up %d /dev/tty<N> device(s)", tty_info->nbtty); |
b0a33c1e | 974 | return 0; |
975 | } | |
976 | ||
59bb8698 | 977 | static int setup_rootfs_pivot_root(const char *rootfs) |
bf601689 | 978 | { |
2d489f9e | 979 | int oldroot = -1, newroot = -1; |
bf601689 | 980 | |
2d489f9e SH |
981 | oldroot = open("/", O_DIRECTORY | O_RDONLY); |
982 | if (oldroot < 0) { | |
983 | SYSERROR("Error opening old-/ for fchdir"); | |
9ba8130c SH |
984 | return -1; |
985 | } | |
2d489f9e SH |
986 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY); |
987 | if (newroot < 0) { | |
988 | SYSERROR("Error opening new-/ for fchdir"); | |
989 | goto fail; | |
c08556c6 | 990 | } |
bf601689 | 991 | |
cc6f6dd7 | 992 | /* change into new root fs */ |
2d489f9e | 993 | if (fchdir(newroot)) { |
cc6f6dd7 | 994 | SYSERROR("can't chdir to new rootfs '%s'", rootfs); |
2d489f9e | 995 | goto fail; |
cc6f6dd7 DL |
996 | } |
997 | ||
cc6f6dd7 | 998 | /* pivot_root into our new root fs */ |
2d489f9e | 999 | if (pivot_root(".", ".")) { |
cc6f6dd7 | 1000 | SYSERROR("pivot_root syscall failed"); |
2d489f9e | 1001 | goto fail; |
bf601689 | 1002 | } |
cc6f6dd7 | 1003 | |
2d489f9e SH |
1004 | /* |
1005 | * at this point the old-root is mounted on top of our new-root | |
1006 | * To unmounted it we must not be chdir'd into it, so escape back | |
1007 | * to old-root | |
1008 | */ | |
1009 | if (fchdir(oldroot) < 0) { | |
1010 | SYSERROR("Error entering oldroot"); | |
1011 | goto fail; | |
1012 | } | |
7981ea46 | 1013 | if (umount2(".", MNT_DETACH) < 0) { |
2d489f9e SH |
1014 | SYSERROR("Error detaching old root"); |
1015 | goto fail; | |
cc6f6dd7 DL |
1016 | } |
1017 | ||
2d489f9e SH |
1018 | if (fchdir(newroot) < 0) { |
1019 | SYSERROR("Error re-entering newroot"); | |
1020 | goto fail; | |
1021 | } | |
cc6f6dd7 | 1022 | |
2d489f9e SH |
1023 | close(oldroot); |
1024 | close(newroot); | |
bf601689 | 1025 | |
2d489f9e | 1026 | DEBUG("pivot_root syscall to '%s' successful", rootfs); |
bf601689 | 1027 | |
bf601689 | 1028 | return 0; |
2d489f9e SH |
1029 | |
1030 | fail: | |
1031 | if (oldroot != -1) | |
1032 | close(oldroot); | |
1033 | if (newroot != -1) | |
1034 | close(newroot); | |
1035 | return -1; | |
bf601689 MH |
1036 | } |
1037 | ||
7133b912 CB |
1038 | /* Just create a path for /dev under $lxcpath/$name and in rootfs If we hit an |
1039 | * error, log it but don't fail yet. | |
91c3830e | 1040 | */ |
7133b912 CB |
1041 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, |
1042 | const char *lxcpath) | |
91c3830e SH |
1043 | { |
1044 | int ret; | |
87da4ec3 SH |
1045 | size_t clen; |
1046 | char *path; | |
91c3830e | 1047 | |
7133b912 | 1048 | INFO("Preparing \"/dev\""); |
bc6928ff | 1049 | |
14221cbb | 1050 | /* $(rootfs->mount) + "/dev/pts" + '\0' */ |
ec50007f | 1051 | clen = (rootfs->path ? strlen(rootfs->mount) : 0) + 9; |
87da4ec3 | 1052 | path = alloca(clen); |
bc6928ff | 1053 | |
ec50007f | 1054 | ret = snprintf(path, clen, "%s/dev", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1055 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1056 | return -1; |
bc6928ff | 1057 | |
87da4ec3 | 1058 | if (!dir_exists(path)) { |
7133b912 CB |
1059 | WARN("\"/dev\" directory does not exist. Proceeding without " |
1060 | "autodev being set up"); | |
87da4ec3 | 1061 | return 0; |
bc6928ff | 1062 | } |
87da4ec3 | 1063 | |
1ec0e8e3 | 1064 | ret = safe_mount("none", path, "tmpfs", 0, "size=500000,mode=755", |
7133b912 CB |
1065 | rootfs->path ? rootfs->mount : NULL); |
1066 | if (ret < 0) { | |
1067 | SYSERROR("Failed to mount tmpfs on \"%s\"", path); | |
1ec0e8e3 | 1068 | return -1; |
91c3830e | 1069 | } |
7133b912 | 1070 | INFO("Mounted tmpfs on \"%s\"", path); |
87da4ec3 | 1071 | |
ec50007f | 1072 | ret = snprintf(path, clen, "%s/dev/pts", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1073 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1074 | return -1; |
87da4ec3 | 1075 | |
7133b912 | 1076 | /* If we are running on a devtmpfs mapping, dev/pts may already exist. |
bc6928ff MW |
1077 | * If not, then create it and exit if that fails... |
1078 | */ | |
87da4ec3 | 1079 | if (!dir_exists(path)) { |
bc6928ff | 1080 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
7133b912 CB |
1081 | if (ret < 0) { |
1082 | SYSERROR("Failed to create directory \"%s\"", path); | |
bc6928ff MW |
1083 | return -1; |
1084 | } | |
91c3830e SH |
1085 | } |
1086 | ||
7133b912 | 1087 | INFO("Prepared \"/dev\""); |
91c3830e SH |
1088 | return 0; |
1089 | } | |
1090 | ||
c6883f38 | 1091 | struct lxc_devs { |
74a3920a | 1092 | const char *name; |
c6883f38 SH |
1093 | mode_t mode; |
1094 | int maj; | |
1095 | int min; | |
1096 | }; | |
1097 | ||
74a3920a | 1098 | static const struct lxc_devs lxc_devs[] = { |
c6883f38 SH |
1099 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
1100 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
1101 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, | |
1102 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, | |
1103 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, | |
1104 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
c6883f38 SH |
1105 | }; |
1106 | ||
27245ff7 | 1107 | static int lxc_fill_autodev(const struct lxc_rootfs *rootfs) |
c6883f38 SH |
1108 | { |
1109 | int ret; | |
c6883f38 SH |
1110 | char path[MAXPATHLEN]; |
1111 | int i; | |
3a32201c | 1112 | mode_t cmask; |
c6883f38 | 1113 | |
ec50007f | 1114 | ret = snprintf(path, MAXPATHLEN, "%s/dev", rootfs->path ? rootfs->mount : ""); |
91c3830e SH |
1115 | if (ret < 0 || ret >= MAXPATHLEN) { |
1116 | ERROR("Error calculating container /dev location"); | |
c6883f38 | 1117 | return -1; |
f7bee6c6 | 1118 | } |
91c3830e | 1119 | |
0bbf8572 CB |
1120 | /* ignore, just don't try to fill in */ |
1121 | if (!dir_exists(path)) | |
9cb4d183 SH |
1122 | return 0; |
1123 | ||
0bbf8572 | 1124 | INFO("populating container /dev"); |
3a32201c | 1125 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
c6883f38 | 1126 | for (i = 0; i < sizeof(lxc_devs) / sizeof(lxc_devs[0]); i++) { |
74a3920a | 1127 | const struct lxc_devs *d = &lxc_devs[i]; |
0728ebf4 | 1128 | |
ec50007f | 1129 | ret = snprintf(path, MAXPATHLEN, "%s/dev/%s", rootfs->path ? rootfs->mount : "", d->name); |
c6883f38 SH |
1130 | if (ret < 0 || ret >= MAXPATHLEN) |
1131 | return -1; | |
0bbf8572 | 1132 | |
c6883f38 | 1133 | ret = mknod(path, d->mode, makedev(d->maj, d->min)); |
0bbf8572 | 1134 | if (ret < 0) { |
9cb4d183 SH |
1135 | char hostpath[MAXPATHLEN]; |
1136 | FILE *pathfile; | |
1137 | ||
0bbf8572 CB |
1138 | if (errno == EEXIST) { |
1139 | DEBUG("\"%s\" device already existed", path); | |
1140 | continue; | |
1141 | } | |
1142 | ||
1143 | /* Unprivileged containers cannot create devices, so | |
1144 | * bind mount the device from the host. | |
1145 | */ | |
9cb4d183 SH |
1146 | ret = snprintf(hostpath, MAXPATHLEN, "/dev/%s", d->name); |
1147 | if (ret < 0 || ret >= MAXPATHLEN) | |
1148 | return -1; | |
1149 | pathfile = fopen(path, "wb"); | |
1150 | if (!pathfile) { | |
1151 | SYSERROR("Failed to create device mount target '%s'", path); | |
1152 | return -1; | |
1153 | } | |
1154 | fclose(pathfile); | |
0bbf8572 CB |
1155 | if (safe_mount(hostpath, path, 0, MS_BIND, NULL, rootfs->path ? rootfs->mount : NULL) != 0) { |
1156 | SYSERROR("Failed bind mounting device %s from host into container", d->name); | |
9cb4d183 SH |
1157 | return -1; |
1158 | } | |
0bbf8572 CB |
1159 | DEBUG("bind mounted \"%s\" onto \"%s\"", hostpath, path); |
1160 | } else { | |
1161 | DEBUG("created device node \"%s\"", path); | |
c6883f38 SH |
1162 | } |
1163 | } | |
3a32201c | 1164 | umask(cmask); |
c6883f38 | 1165 | |
0bbf8572 | 1166 | INFO("populated container /dev"); |
c6883f38 SH |
1167 | return 0; |
1168 | } | |
1169 | ||
9aa76a17 | 1170 | static int lxc_setup_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1171 | { |
9aa76a17 | 1172 | int ret; |
91c3e281 CB |
1173 | struct bdev *bdev; |
1174 | const struct lxc_rootfs *rootfs; | |
cc28d0b0 | 1175 | |
91c3e281 | 1176 | rootfs = &conf->rootfs; |
a0f379bf | 1177 | if (!rootfs->path) { |
91c3e281 CB |
1178 | if (mount("", "/", NULL, MS_SLAVE | MS_REC, 0)) { |
1179 | SYSERROR("Failed to make / rslave."); | |
a0f379bf DW |
1180 | return -1; |
1181 | } | |
c69bd12f | 1182 | return 0; |
a0f379bf | 1183 | } |
0ad19a3f | 1184 | |
12297168 | 1185 | if (access(rootfs->mount, F_OK)) { |
91c3e281 | 1186 | SYSERROR("Failed to access to \"%s\". Check it is present.", |
12297168 | 1187 | rootfs->mount); |
b1789442 DL |
1188 | return -1; |
1189 | } | |
1190 | ||
91c3e281 | 1191 | bdev = bdev_init(conf, rootfs->path, rootfs->mount, rootfs->options); |
9aa76a17 CB |
1192 | if (!bdev) { |
1193 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\".", | |
91c3e281 CB |
1194 | rootfs->path, rootfs->mount, |
1195 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1196 | return -1; |
9be53773 | 1197 | } |
9aa76a17 CB |
1198 | |
1199 | ret = bdev->ops->mount(bdev); | |
1200 | bdev_put(bdev); | |
1201 | if (ret < 0) { | |
91c3e281 CB |
1202 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\".", |
1203 | rootfs->path, rootfs->mount, | |
1204 | rootfs->options ? rootfs->options : "(null)"); | |
c3f0a28c | 1205 | return -1; |
1206 | } | |
0ad19a3f | 1207 | |
91c3e281 CB |
1208 | DEBUG("Mounted rootfs \"%s\" onto \"%s\" with options \"%s\".", |
1209 | rootfs->path, rootfs->mount, | |
1210 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1211 | |
ac778708 DL |
1212 | return 0; |
1213 | } | |
1214 | ||
91e93c71 AV |
1215 | int prepare_ramfs_root(char *root) |
1216 | { | |
eab15c1e | 1217 | char buf[LXC_LINELEN], *p; |
91e93c71 AV |
1218 | char nroot[PATH_MAX]; |
1219 | FILE *f; | |
1220 | int i; | |
1221 | char *p2; | |
1222 | ||
1223 | if (realpath(root, nroot) == NULL) | |
39c7b795 | 1224 | return -errno; |
91e93c71 AV |
1225 | |
1226 | if (chdir("/") == -1) | |
39c7b795 | 1227 | return -errno; |
91e93c71 AV |
1228 | |
1229 | /* | |
1230 | * We could use here MS_MOVE, but in userns this mount is | |
1231 | * locked and can't be moved. | |
1232 | */ | |
39c7b795 | 1233 | if (mount(root, "/", NULL, MS_REC | MS_BIND, NULL) < 0) { |
91e93c71 | 1234 | SYSERROR("Failed to move %s into /", root); |
39c7b795 | 1235 | return -errno; |
91e93c71 AV |
1236 | } |
1237 | ||
39c7b795 | 1238 | if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL) < 0) { |
91e93c71 | 1239 | SYSERROR("Failed to make . rprivate"); |
39c7b795 | 1240 | return -errno; |
91e93c71 AV |
1241 | } |
1242 | ||
1243 | /* | |
1244 | * The following code cleans up inhereted mounts which are not | |
1245 | * required for CT. | |
1246 | * | |
1247 | * The mountinfo file shows not all mounts, if a few points have been | |
1248 | * unmounted between read operations from the mountinfo. So we need to | |
1249 | * read mountinfo a few times. | |
1250 | * | |
1251 | * This loop can be skipped if a container uses unserns, because all | |
1252 | * inherited mounts are locked and we should live with all this trash. | |
1253 | */ | |
1254 | while (1) { | |
1255 | int progress = 0; | |
1256 | ||
1257 | f = fopen("./proc/self/mountinfo", "r"); | |
1258 | if (!f) { | |
1259 | SYSERROR("Unable to open /proc/self/mountinfo"); | |
1260 | return -1; | |
1261 | } | |
eab15c1e | 1262 | while (fgets(buf, LXC_LINELEN, f)) { |
91e93c71 AV |
1263 | for (p = buf, i=0; p && i < 4; i++) |
1264 | p = strchr(p+1, ' '); | |
1265 | if (!p) | |
1266 | continue; | |
1267 | p2 = strchr(p+1, ' '); | |
1268 | if (!p2) | |
1269 | continue; | |
1270 | ||
1271 | *p2 = '\0'; | |
1272 | *p = '.'; | |
1273 | ||
1274 | if (strcmp(p + 1, "/") == 0) | |
1275 | continue; | |
1276 | if (strcmp(p + 1, "/proc") == 0) | |
1277 | continue; | |
1278 | ||
1279 | if (umount2(p, MNT_DETACH) == 0) | |
1280 | progress++; | |
1281 | } | |
1282 | fclose(f); | |
1283 | if (!progress) | |
1284 | break; | |
1285 | } | |
1286 | ||
8bea9fae PR |
1287 | /* This also can be skipped if a container uses unserns */ |
1288 | umount2("./proc", MNT_DETACH); | |
91e93c71 AV |
1289 | |
1290 | /* It is weird, but chdir("..") moves us in a new root */ | |
1291 | if (chdir("..") == -1) { | |
1292 | SYSERROR("Unable to change working directory"); | |
1293 | return -1; | |
1294 | } | |
1295 | ||
1296 | if (chroot(".") == -1) { | |
1297 | SYSERROR("Unable to chroot"); | |
1298 | return -1; | |
1299 | } | |
1300 | ||
1301 | return 0; | |
1302 | } | |
1303 | ||
74a3920a | 1304 | static int setup_pivot_root(const struct lxc_rootfs *rootfs) |
ac778708 | 1305 | { |
39c7b795 CB |
1306 | if (!rootfs->path) { |
1307 | DEBUG("container does not have a rootfs, so not doing pivot root"); | |
ac778708 | 1308 | return 0; |
39c7b795 | 1309 | } |
ac778708 | 1310 | |
91e93c71 | 1311 | if (detect_ramfs_rootfs()) { |
39c7b795 CB |
1312 | DEBUG("detected that container is on ramfs"); |
1313 | if (prepare_ramfs_root(rootfs->mount)) { | |
1314 | ERROR("failed to prepare minimal ramfs root"); | |
91e93c71 | 1315 | return -1; |
39c7b795 CB |
1316 | } |
1317 | ||
1318 | DEBUG("prepared ramfs root for container"); | |
1319 | return 0; | |
1320 | } | |
1321 | ||
1322 | if (setup_rootfs_pivot_root(rootfs->mount) < 0) { | |
1323 | ERROR("failed to pivot root"); | |
25368b52 | 1324 | return -1; |
c69bd12f DL |
1325 | } |
1326 | ||
39c7b795 | 1327 | DEBUG("finished pivot root"); |
25368b52 | 1328 | return 0; |
0ad19a3f | 1329 | } |
1330 | ||
70761e5e | 1331 | static int lxc_setup_devpts(int num_pts) |
3c26f34e | 1332 | { |
70761e5e | 1333 | int ret; |
9d28c4f9 CB |
1334 | const char *default_devpts_mntopts = "newinstance,ptmxmode=0666,mode=0620,gid=5"; |
1335 | char devpts_mntopts[256]; | |
77890c6d | 1336 | |
70761e5e CB |
1337 | if (!num_pts) { |
1338 | DEBUG("no new devpts instance will be mounted since no pts " | |
1339 | "devices are requested"); | |
d852c78c | 1340 | return 0; |
3c26f34e | 1341 | } |
1342 | ||
9d28c4f9 CB |
1343 | ret = snprintf(devpts_mntopts, sizeof(devpts_mntopts), "%s,max=%d", |
1344 | default_devpts_mntopts, num_pts); | |
1345 | if (ret < 0 || (size_t)ret >= sizeof(devpts_mntopts)) | |
1346 | return -1; | |
1347 | ||
d5cb35d6 | 1348 | /* Unmount old devpts instance. */ |
70761e5e CB |
1349 | ret = access("/dev/pts/ptmx", F_OK); |
1350 | if (!ret) { | |
70761e5e CB |
1351 | ret = umount("/dev/pts"); |
1352 | if (ret < 0) { | |
1353 | SYSERROR("failed to unmount old devpts instance"); | |
1354 | return -1; | |
7e40254a | 1355 | } |
70761e5e | 1356 | DEBUG("unmounted old /dev/pts instance"); |
7e40254a JTLB |
1357 | } |
1358 | ||
70761e5e CB |
1359 | /* Create mountpoint for devpts instance. */ |
1360 | ret = mkdir("/dev/pts", 0755); | |
1361 | if (ret < 0 && errno != EEXIST) { | |
1362 | SYSERROR("failed to create the \"/dev/pts\" directory"); | |
3c26f34e | 1363 | return -1; |
1364 | } | |
1365 | ||
70761e5e CB |
1366 | /* Mount new devpts instance. */ |
1367 | ret = mount("devpts", "/dev/pts", "devpts", MS_MGC_VAL, devpts_mntopts); | |
1368 | if (ret < 0) { | |
1369 | SYSERROR("failed to mount new devpts instance"); | |
1370 | return -1; | |
1371 | } | |
f4f52cb5 | 1372 | DEBUG("mount new devpts instance with options \"%s\"", devpts_mntopts); |
70761e5e | 1373 | |
d5cb35d6 | 1374 | /* Remove any pre-existing /dev/ptmx file. */ |
70761e5e | 1375 | ret = access("/dev/ptmx", F_OK); |
d5cb35d6 CB |
1376 | if (!ret) { |
1377 | ret = remove("/dev/ptmx"); | |
1378 | if (ret < 0) { | |
1379 | SYSERROR("failed to remove existing \"/dev/ptmx\""); | |
1380 | return -1; | |
70761e5e | 1381 | } |
d5cb35d6 | 1382 | DEBUG("removed existing \"/dev/ptmx\""); |
3c26f34e | 1383 | } |
1384 | ||
d5cb35d6 CB |
1385 | /* Create dummy /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
1386 | ret = open("/dev/ptmx", O_CREAT, 0666); | |
1387 | if (ret < 0) { | |
1388 | SYSERROR("failed to create dummy \"/dev/ptmx\" file as bind mount target"); | |
1389 | return -1; | |
1390 | } | |
e87bd19c | 1391 | close(ret); |
d5cb35d6 | 1392 | DEBUG("created dummy \"/dev/ptmx\" file as bind mount target"); |
77890c6d | 1393 | |
d5cb35d6 | 1394 | /* Fallback option: create symlink /dev/ptmx -> /dev/pts/ptmx */ |
e87bd19c | 1395 | ret = mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL); |
d5cb35d6 CB |
1396 | if (!ret) { |
1397 | DEBUG("bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); | |
1398 | return 0; | |
1399 | } else { | |
1400 | /* Fallthrough and try to create a symlink. */ | |
1401 | ERROR("failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); | |
1402 | } | |
1403 | ||
1404 | /* Remove the dummy /dev/ptmx file we created above. */ | |
1405 | ret = remove("/dev/ptmx"); | |
70761e5e | 1406 | if (ret < 0) { |
d5cb35d6 CB |
1407 | SYSERROR("failed to remove existing \"/dev/ptmx\""); |
1408 | return -1; | |
1409 | } | |
1410 | ||
1411 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
1412 | ret = symlink("/dev/pts/ptmx", "/dev/ptmx"); | |
1413 | if (ret < 0) { | |
1414 | SYSERROR("failed to create symlink \"/dev/ptmx\" -> \"/dev/pts/ptmx\""); | |
3c26f34e | 1415 | return -1; |
1416 | } | |
d5cb35d6 | 1417 | DEBUG("created symlink \"/dev/ptmx\" -> \"/dev/pts/ptmx\""); |
cd54d859 | 1418 | |
3c26f34e | 1419 | return 0; |
1420 | } | |
1421 | ||
cccc74b5 DL |
1422 | static int setup_personality(int persona) |
1423 | { | |
6ff05e18 | 1424 | #if HAVE_SYS_PERSONALITY_H |
cccc74b5 DL |
1425 | if (persona == -1) |
1426 | return 0; | |
1427 | ||
1428 | if (personality(persona) < 0) { | |
1429 | SYSERROR("failed to set personality to '0x%x'", persona); | |
1430 | return -1; | |
1431 | } | |
1432 | ||
1433 | INFO("set personality to '0x%x'", persona); | |
6ff05e18 | 1434 | #endif |
cccc74b5 DL |
1435 | |
1436 | return 0; | |
1437 | } | |
1438 | ||
3d7d929a CB |
1439 | static int lxc_setup_dev_console(const struct lxc_rootfs *rootfs, |
1440 | const struct lxc_console *console) | |
6e590161 | 1441 | { |
63376d7d | 1442 | char path[MAXPATHLEN]; |
0728ebf4 | 1443 | int ret, fd; |
52e35957 | 1444 | |
8b1b1210 CB |
1445 | if (console->path && !strcmp(console->path, "none")) |
1446 | return 0; | |
1447 | ||
7c6ef2a2 | 1448 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); |
3d7d929a | 1449 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1450 | return -1; |
52e35957 | 1451 | |
8b1b1210 CB |
1452 | /* When we are asked to setup a console we remove any previous |
1453 | * /dev/console bind-mounts. | |
1454 | */ | |
a7ba3c7f CB |
1455 | if (file_exists(path)) { |
1456 | ret = lxc_unstack_mountpoint(path, false); | |
1457 | if (ret < 0) { | |
8b1b1210 | 1458 | ERROR("failed to unmount \"%s\": %s", path, strerror(errno)); |
a7ba3c7f CB |
1459 | return -ret; |
1460 | } else { | |
1461 | DEBUG("cleared all (%d) mounts from \"%s\"", ret, path); | |
1462 | } | |
953fe44f | 1463 | |
a7ba3c7f CB |
1464 | ret = unlink(path); |
1465 | if (ret < 0) { | |
1466 | SYSERROR("error unlinking %s", path); | |
8b1b1210 CB |
1467 | return -errno; |
1468 | } | |
8b1b1210 CB |
1469 | } |
1470 | ||
1471 | /* For unprivileged containers autodev or automounts will already have | |
1472 | * taken care of creating /dev/console. | |
1473 | */ | |
0728ebf4 TA |
1474 | fd = open(path, O_CREAT | O_EXCL, S_IXUSR | S_IXGRP | S_IXOTH); |
1475 | if (fd < 0) { | |
1476 | if (errno != EEXIST) { | |
1477 | SYSERROR("failed to create console"); | |
3d7d929a | 1478 | return -errno; |
0728ebf4 TA |
1479 | } |
1480 | } else { | |
1481 | close(fd); | |
52e35957 DL |
1482 | } |
1483 | ||
0728ebf4 | 1484 | if (chmod(console->name, S_IXUSR | S_IXGRP | S_IXOTH)) { |
3d7d929a CB |
1485 | SYSERROR("failed to set mode '0%o' to '%s'", S_IXUSR | S_IXGRP | S_IXOTH, console->name); |
1486 | return -errno; | |
63376d7d | 1487 | } |
13954cce | 1488 | |
3d7d929a | 1489 | if (safe_mount(console->name, path, "none", MS_BIND, 0, rootfs->mount) < 0) { |
63376d7d | 1490 | ERROR("failed to mount '%s' on '%s'", console->name, path); |
6e590161 | 1491 | return -1; |
1492 | } | |
1493 | ||
3d7d929a | 1494 | DEBUG("mounted pts device \"%s\" onto \"%s\"", console->name, path); |
7c6ef2a2 SH |
1495 | return 0; |
1496 | } | |
1497 | ||
3d7d929a CB |
1498 | static int lxc_setup_ttydir_console(const struct lxc_rootfs *rootfs, |
1499 | const struct lxc_console *console, | |
1500 | char *ttydir) | |
7c6ef2a2 | 1501 | { |
7c6ef2a2 | 1502 | int ret; |
3d7d929a | 1503 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
7c6ef2a2 SH |
1504 | |
1505 | /* create rootfs/dev/<ttydir> directory */ | |
3d7d929a CB |
1506 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs->mount, ttydir); |
1507 | if (ret < 0 || (size_t)ret >= sizeof(path)) | |
7c6ef2a2 | 1508 | return -1; |
3d7d929a | 1509 | |
7c6ef2a2 SH |
1510 | ret = mkdir(path, 0755); |
1511 | if (ret && errno != EEXIST) { | |
959aee9c | 1512 | SYSERROR("failed with errno %d to create %s", errno, path); |
3d7d929a | 1513 | return -errno; |
7c6ef2a2 | 1514 | } |
3d7d929a | 1515 | DEBUG("created directory for console and tty devices at \%s\"", path); |
7c6ef2a2 | 1516 | |
3d7d929a CB |
1517 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", rootfs->mount, ttydir); |
1518 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) | |
1519 | return -1; | |
1520 | ||
7c6ef2a2 | 1521 | ret = creat(lxcpath, 0660); |
3d7d929a | 1522 | if (ret == -1 && errno != EEXIST) { |
959aee9c | 1523 | SYSERROR("error %d creating %s", errno, lxcpath); |
3d7d929a | 1524 | return -errno; |
7c6ef2a2 | 1525 | } |
4d44e274 SH |
1526 | if (ret >= 0) |
1527 | close(ret); | |
7c6ef2a2 | 1528 | |
2a12fefd CB |
1529 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); |
1530 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) | |
7c6ef2a2 | 1531 | return -1; |
2a12fefd CB |
1532 | |
1533 | /* When we are asked to setup a console we remove any previous | |
1534 | * /dev/console bind-mounts. | |
1535 | */ | |
1536 | if (console->path && !strcmp(console->path, "none")) { | |
1537 | struct stat st; | |
1538 | ret = stat(path, &st); | |
1539 | if (ret < 0) { | |
1540 | if (errno == ENOENT) | |
1541 | return 0; | |
1542 | SYSERROR("failed stat() \"%s\"", path); | |
1543 | return -errno; | |
1544 | } | |
1545 | ||
1546 | /* /dev/console must be character device with major number 5 and | |
1547 | * minor number 1. If not, give benefit of the doubt and assume | |
1548 | * the user has mounted something else right there on purpose. | |
1549 | */ | |
1550 | if (((st.st_mode & S_IFMT) != S_IFCHR) || major(st.st_rdev) != 5 || minor(st.st_rdev) != 1) | |
1551 | return 0; | |
1552 | ||
1553 | /* In case the user requested a bind-mount for /dev/console and | |
1554 | * requests a ttydir we move the mount to the | |
a7ba3c7f CB |
1555 | * /dev/<ttydir/console. |
1556 | * Note, we only move the uppermost mount and clear all other | |
1557 | * mounts underneath for safety. | |
1558 | * If it is a character device created via mknod() we simply | |
1559 | * rename it. | |
2a12fefd CB |
1560 | */ |
1561 | ret = safe_mount(path, lxcpath, "none", MS_MOVE, NULL, rootfs->mount); | |
1562 | if (ret < 0) { | |
1563 | if (errno != EINVAL) { | |
1564 | ERROR("failed to MS_MOVE \"%s\" to \"%s\": %s", path, lxcpath, strerror(errno)); | |
1565 | return -errno; | |
1566 | } | |
1567 | /* path was not a mountpoint */ | |
1568 | ret = rename(path, lxcpath); | |
1569 | if (ret < 0) { | |
1570 | ERROR("failed to rename \"%s\" to \"%s\": %s", path, lxcpath, strerror(errno)); | |
1571 | return -errno; | |
1572 | } | |
1573 | DEBUG("renamed \"%s\" to \"%s\"", path, lxcpath); | |
1574 | } else { | |
1575 | DEBUG("moved mount \"%s\" to \"%s\"", path, lxcpath); | |
1576 | } | |
a7ba3c7f CB |
1577 | |
1578 | /* Clear all remaining bind-mounts. */ | |
1579 | ret = lxc_unstack_mountpoint(path, false); | |
2a12fefd | 1580 | if (ret < 0) { |
a7ba3c7f CB |
1581 | ERROR("failed to unmount \"%s\": %s", path, strerror(errno)); |
1582 | return -ret; | |
1583 | } else { | |
1584 | DEBUG("cleared all (%d) mounts from \"%s\"", ret, path); | |
1585 | } | |
1586 | } else { | |
1587 | if (file_exists(path)) { | |
1588 | ret = lxc_unstack_mountpoint(path, false); | |
1589 | if (ret < 0) { | |
2a12fefd | 1590 | ERROR("failed to unmount \"%s\": %s", path, strerror(errno)); |
a7ba3c7f CB |
1591 | return -ret; |
1592 | } else { | |
1593 | DEBUG("cleared all (%d) mounts from \"%s\"", ret, path); | |
2a12fefd | 1594 | } |
2a12fefd CB |
1595 | } |
1596 | ||
1597 | if (safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs->mount) < 0) { | |
1598 | ERROR("failed to mount '%s' on '%s'", console->name, lxcpath); | |
1599 | return -1; | |
1600 | } | |
1601 | DEBUG("mounted \"%s\" onto \"%s\"", console->name, lxcpath); | |
7c6ef2a2 SH |
1602 | } |
1603 | ||
2a12fefd | 1604 | /* create symlink from rootfs /dev/console to '<ttydir>/console' */ |
9ba8130c | 1605 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/console", ttydir); |
3d7d929a | 1606 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
9ba8130c | 1607 | return -1; |
3d7d929a | 1608 | |
2a12fefd CB |
1609 | ret = unlink(path); |
1610 | if (ret && errno != ENOENT) { | |
1611 | SYSERROR("error unlinking %s", path); | |
1612 | return -errno; | |
1613 | } | |
1614 | ||
7c6ef2a2 | 1615 | ret = symlink(lxcpath, path); |
3d7d929a CB |
1616 | if (ret < 0) { |
1617 | SYSERROR("failed to create symlink for console from \"%s\" to \"%s\"", lxcpath, path); | |
7c6ef2a2 SH |
1618 | return -1; |
1619 | } | |
1620 | ||
3d7d929a | 1621 | DEBUG("console has been setup under \"%s\" and symlinked to \"%s\"", lxcpath, path); |
6e590161 | 1622 | return 0; |
1623 | } | |
1624 | ||
3d7d929a CB |
1625 | static int lxc_setup_console(const struct lxc_rootfs *rootfs, |
1626 | const struct lxc_console *console, char *ttydir) | |
7c6ef2a2 | 1627 | { |
3d7d929a CB |
1628 | /* We don't have a rootfs, /dev/console will be shared. */ |
1629 | if (!rootfs->path) { | |
1630 | DEBUG("/dev/console will be shared with the host"); | |
7c6ef2a2 | 1631 | return 0; |
3d7d929a CB |
1632 | } |
1633 | ||
7c6ef2a2 | 1634 | if (!ttydir) |
3d7d929a | 1635 | return lxc_setup_dev_console(rootfs, console); |
7c6ef2a2 | 1636 | |
3d7d929a | 1637 | return lxc_setup_ttydir_console(rootfs, console, ttydir); |
7c6ef2a2 SH |
1638 | } |
1639 | ||
998ac676 RT |
1640 | static void parse_mntopt(char *opt, unsigned long *flags, char **data) |
1641 | { | |
1642 | struct mount_opt *mo; | |
1643 | ||
1644 | /* If opt is found in mount_opt, set or clear flags. | |
1645 | * Otherwise append it to data. */ | |
1646 | ||
1647 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
1648 | if (!strncmp(opt, mo->name, strlen(mo->name))) { | |
1649 | if (mo->clear) | |
1650 | *flags &= ~mo->flag; | |
1651 | else | |
1652 | *flags |= mo->flag; | |
1653 | return; | |
1654 | } | |
1655 | } | |
1656 | ||
1657 | if (strlen(*data)) | |
1658 | strcat(*data, ","); | |
1659 | strcat(*data, opt); | |
1660 | } | |
1661 | ||
a17b1e65 | 1662 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, |
998ac676 RT |
1663 | char **mntdata) |
1664 | { | |
1665 | char *s, *data; | |
1666 | char *p, *saveptr = NULL; | |
1667 | ||
911324ef | 1668 | *mntdata = NULL; |
91656ce5 | 1669 | *mntflags = 0L; |
911324ef DL |
1670 | |
1671 | if (!mntopts) | |
998ac676 RT |
1672 | return 0; |
1673 | ||
911324ef | 1674 | s = strdup(mntopts); |
998ac676 | 1675 | if (!s) { |
36eb9bde | 1676 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1677 | return -1; |
1678 | } | |
1679 | ||
1680 | data = malloc(strlen(s) + 1); | |
1681 | if (!data) { | |
36eb9bde | 1682 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1683 | free(s); |
1684 | return -1; | |
1685 | } | |
1686 | *data = 0; | |
1687 | ||
1688 | for (p = strtok_r(s, ",", &saveptr); p != NULL; | |
1689 | p = strtok_r(NULL, ",", &saveptr)) | |
1690 | parse_mntopt(p, mntflags, &data); | |
1691 | ||
1692 | if (*data) | |
1693 | *mntdata = data; | |
1694 | else | |
1695 | free(data); | |
1696 | free(s); | |
1697 | ||
1698 | return 0; | |
1699 | } | |
1700 | ||
6fd5e769 SH |
1701 | static void null_endofword(char *word) |
1702 | { | |
1703 | while (*word && *word != ' ' && *word != '\t') | |
1704 | word++; | |
1705 | *word = '\0'; | |
1706 | } | |
1707 | ||
1708 | /* | |
1709 | * skip @nfields spaces in @src | |
1710 | */ | |
1711 | static char *get_field(char *src, int nfields) | |
1712 | { | |
1713 | char *p = src; | |
1714 | int i; | |
1715 | ||
1716 | for (i = 0; i < nfields; i++) { | |
1717 | while (*p && *p != ' ' && *p != '\t') | |
1718 | p++; | |
1719 | if (!*p) | |
1720 | break; | |
1721 | p++; | |
1722 | } | |
1723 | return p; | |
1724 | } | |
1725 | ||
911324ef DL |
1726 | static int mount_entry(const char *fsname, const char *target, |
1727 | const char *fstype, unsigned long mountflags, | |
0ac4b28a CB |
1728 | const char *data, int optional, int dev, |
1729 | const char *rootfs) | |
911324ef | 1730 | { |
0ac4b28a | 1731 | int ret; |
614305f3 | 1732 | #ifdef HAVE_STATVFS |
2938f7c8 | 1733 | struct statvfs sb; |
614305f3 | 1734 | #endif |
2938f7c8 | 1735 | |
0ac4b28a CB |
1736 | ret = safe_mount(fsname, target, fstype, mountflags & ~MS_REMOUNT, data, |
1737 | rootfs); | |
1738 | if (ret < 0) { | |
1fc64d22 | 1739 | if (optional) { |
0ac4b28a CB |
1740 | INFO("Failed to mount \"%s\" on \"%s\" (optional): %s", |
1741 | fsname, target, strerror(errno)); | |
1fc64d22 SG |
1742 | return 0; |
1743 | } | |
0ac4b28a CB |
1744 | |
1745 | SYSERROR("Failed to mount \"%s\" on \"%s\"", fsname, target); | |
1746 | return -1; | |
911324ef DL |
1747 | } |
1748 | ||
1749 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
7c5b6e7c | 1750 | unsigned long rqd_flags = 0; |
0ac4b28a CB |
1751 | |
1752 | DEBUG("Remounting \"%s\" on \"%s\" to respect bind or remount " | |
1753 | "options", | |
1754 | fsname ? fsname : "(none)", target ? target : "(none)"); | |
1755 | ||
7c5b6e7c AS |
1756 | if (mountflags & MS_RDONLY) |
1757 | rqd_flags |= MS_RDONLY; | |
614305f3 | 1758 | #ifdef HAVE_STATVFS |
2938f7c8 | 1759 | if (statvfs(fsname, &sb) == 0) { |
7c5b6e7c | 1760 | unsigned long required_flags = rqd_flags; |
0ac4b28a | 1761 | |
2938f7c8 SH |
1762 | if (sb.f_flag & MS_NOSUID) |
1763 | required_flags |= MS_NOSUID; | |
0ac4b28a | 1764 | |
ae7a770e | 1765 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 | 1766 | required_flags |= MS_NODEV; |
0ac4b28a | 1767 | |
2938f7c8 SH |
1768 | if (sb.f_flag & MS_RDONLY) |
1769 | required_flags |= MS_RDONLY; | |
0ac4b28a | 1770 | |
2938f7c8 SH |
1771 | if (sb.f_flag & MS_NOEXEC) |
1772 | required_flags |= MS_NOEXEC; | |
0ac4b28a CB |
1773 | |
1774 | DEBUG("Flags for \"%s\" were %lu, required extra flags " | |
1775 | "are %lu", fsname, sb.f_flag, required_flags); | |
1776 | ||
1777 | /* If this was a bind mount request, and required_flags | |
2938f7c8 | 1778 | * does not have any flags which are not already in |
0ac4b28a | 1779 | * mountflags, then skip the remount. |
2938f7c8 SH |
1780 | */ |
1781 | if (!(mountflags & MS_REMOUNT)) { | |
0ac4b28a CB |
1782 | if (!(required_flags & ~mountflags) && |
1783 | rqd_flags == 0) { | |
1784 | DEBUG("Mountflags already were %lu, " | |
1785 | "skipping remount", mountflags); | |
2938f7c8 SH |
1786 | goto skipremount; |
1787 | } | |
1788 | } | |
0ac4b28a | 1789 | |
2938f7c8 | 1790 | mountflags |= required_flags; |
6fd5e769 | 1791 | } |
614305f3 | 1792 | #endif |
911324ef | 1793 | |
0ac4b28a CB |
1794 | ret = mount(fsname, target, fstype, mountflags | MS_REMOUNT, data); |
1795 | if (ret < 0) { | |
1fc64d22 | 1796 | if (optional) { |
0ac4b28a CB |
1797 | INFO("Failed to mount \"%s\" on \"%s\" " |
1798 | "(optional): %s", fsname, target, | |
1799 | strerror(errno)); | |
1fc64d22 SG |
1800 | return 0; |
1801 | } | |
0ac4b28a CB |
1802 | |
1803 | SYSERROR("Failed to mount \"%s\" on \"%s\"", fsname, target); | |
1804 | return -1; | |
911324ef DL |
1805 | } |
1806 | } | |
1807 | ||
614305f3 | 1808 | #ifdef HAVE_STATVFS |
6fd5e769 | 1809 | skipremount: |
614305f3 | 1810 | #endif |
0ac4b28a CB |
1811 | DEBUG("Mounted \"%s\" on \"%s\" with filesystem type \"%s\"", fsname, |
1812 | target, fstype); | |
911324ef DL |
1813 | |
1814 | return 0; | |
1815 | } | |
1816 | ||
c5e30de4 | 1817 | /* Remove "optional", "create=dir", and "create=file" from mntopt */ |
4e4ca161 SH |
1818 | static void cull_mntent_opt(struct mntent *mntent) |
1819 | { | |
1820 | int i; | |
c5e30de4 CB |
1821 | char *list[] = {"create=dir", "create=file", "optional", NULL}; |
1822 | ||
1823 | for (i = 0; list[i]; i++) { | |
1824 | char *p, *p2; | |
1825 | ||
1826 | p = strstr(mntent->mnt_opts, list[i]); | |
1827 | if (!p) | |
4e4ca161 | 1828 | continue; |
c5e30de4 | 1829 | |
4e4ca161 SH |
1830 | p2 = strchr(p, ','); |
1831 | if (!p2) { | |
1832 | /* no more mntopts, so just chop it here */ | |
1833 | *p = '\0'; | |
1834 | continue; | |
1835 | } | |
c5e30de4 CB |
1836 | |
1837 | memmove(p, p2 + 1, strlen(p2 + 1) + 1); | |
4e4ca161 SH |
1838 | } |
1839 | } | |
1840 | ||
4d5b72a1 | 1841 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
749f98d9 CB |
1842 | const char *path, |
1843 | const struct lxc_rootfs *rootfs, | |
1844 | const char *lxc_name, | |
1845 | const char *lxc_path) | |
0ad19a3f | 1846 | { |
608e3567 | 1847 | int ret = 0; |
911324ef | 1848 | |
749f98d9 CB |
1849 | if (!strncmp(mntent->mnt_type, "overlay", 7)) |
1850 | ret = ovl_mkdir(mntent, rootfs, lxc_name, lxc_path); | |
1851 | else if (!strncmp(mntent->mnt_type, "aufs", 4)) | |
1852 | ret = aufs_mkdir(mntent, rootfs, lxc_name, lxc_path); | |
1853 | if (ret < 0) | |
1854 | return -1; | |
6e46cc0d | 1855 | |
34cfffb3 | 1856 | if (hasmntopt(mntent, "create=dir")) { |
749f98d9 CB |
1857 | ret = mkdir_p(path, 0755); |
1858 | if (ret < 0 && errno != EEXIST) { | |
1859 | SYSERROR("Failed to create directory \"%s\"", path); | |
1860 | return -1; | |
34cfffb3 SG |
1861 | } |
1862 | } | |
1863 | ||
4d5b72a1 | 1864 | if (hasmntopt(mntent, "create=file") && access(path, F_OK)) { |
749f98d9 CB |
1865 | int fd; |
1866 | char *p1, *p2; | |
1867 | ||
1868 | p1 = strdup(path); | |
1869 | if (!p1) | |
1870 | return -1; | |
1871 | ||
1872 | p2 = dirname(p1); | |
1873 | ||
1874 | ret = mkdir_p(p2, 0755); | |
1875 | free(p1); | |
1876 | if (ret < 0 && errno != EEXIST) { | |
1877 | SYSERROR("Failed to create directory \"%s\"", path); | |
1878 | return -1; | |
6e46cc0d | 1879 | } |
749f98d9 CB |
1880 | |
1881 | fd = open(path, O_CREAT, 0644); | |
1882 | if (fd < 0) | |
1883 | return -1; | |
1884 | close(fd); | |
34cfffb3 | 1885 | } |
749f98d9 CB |
1886 | |
1887 | return 0; | |
4d5b72a1 NC |
1888 | } |
1889 | ||
ec50007f CB |
1890 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
1891 | * without a rootfs. */ | |
db4aba38 | 1892 | static inline int mount_entry_on_generic(struct mntent *mntent, |
d8b712bc CB |
1893 | const char *path, |
1894 | const struct lxc_rootfs *rootfs, | |
1895 | const char *lxc_name, | |
1896 | const char *lxc_path) | |
4d5b72a1 | 1897 | { |
d8b712bc | 1898 | int ret; |
4d5b72a1 NC |
1899 | unsigned long mntflags; |
1900 | char *mntdata; | |
d8b712bc | 1901 | bool dev, optional; |
ec50007f | 1902 | char *rootfs_path = NULL; |
d8b712bc CB |
1903 | |
1904 | optional = hasmntopt(mntent, "optional") != NULL; | |
1905 | dev = hasmntopt(mntent, "dev") != NULL; | |
1906 | ||
ec50007f CB |
1907 | if (rootfs && rootfs->path) |
1908 | rootfs_path = rootfs->mount; | |
1909 | ||
d8b712bc CB |
1910 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, |
1911 | lxc_path); | |
1912 | if (ret < 0) { | |
1913 | if (optional) | |
1914 | return 0; | |
608e3567 | 1915 | |
d8b712bc CB |
1916 | return -1; |
1917 | } | |
4e4ca161 SH |
1918 | cull_mntent_opt(mntent); |
1919 | ||
d8b712bc CB |
1920 | ret = parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata); |
1921 | if (ret < 0) | |
a17b1e65 | 1922 | return -1; |
a17b1e65 | 1923 | |
6e46cc0d | 1924 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
ae7a770e | 1925 | mntdata, optional, dev, rootfs_path); |
68c152ef | 1926 | |
911324ef | 1927 | free(mntdata); |
911324ef DL |
1928 | return ret; |
1929 | } | |
1930 | ||
db4aba38 NC |
1931 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
1932 | { | |
1433c9f9 | 1933 | int ret; |
07667a6a | 1934 | char path[MAXPATHLEN]; |
1433c9f9 CB |
1935 | |
1936 | /* For containers created without a rootfs all mounts are treated as | |
07667a6a CB |
1937 | * absolute paths starting at / on the host. |
1938 | */ | |
1433c9f9 CB |
1939 | if (mntent->mnt_dir[0] != '/') |
1940 | ret = snprintf(path, sizeof(path), "/%s", mntent->mnt_dir); | |
1941 | else | |
1942 | ret = snprintf(path, sizeof(path), "%s", mntent->mnt_dir); | |
07667a6a | 1943 | if (ret < 0 || ret >= sizeof(path)) |
1433c9f9 | 1944 | return -1; |
1433c9f9 CB |
1945 | |
1946 | return mount_entry_on_generic(mntent, path, NULL, NULL, NULL); | |
db4aba38 NC |
1947 | } |
1948 | ||
4e4ca161 | 1949 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 | 1950 | const struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
1951 | const char *lxc_name, |
1952 | const char *lxc_path) | |
911324ef | 1953 | { |
bdd2b34c | 1954 | int offset; |
013bd428 | 1955 | char *aux; |
67e571de | 1956 | const char *lxcpath; |
bdd2b34c CB |
1957 | char path[MAXPATHLEN]; |
1958 | int ret = 0; | |
0ad19a3f | 1959 | |
593e8478 | 1960 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
bdd2b34c | 1961 | if (!lxcpath) |
2a59a681 | 1962 | return -1; |
2a59a681 | 1963 | |
bdd2b34c CB |
1964 | /* If rootfs->path is a blockdev path, allow container fstab to use |
1965 | * <lxcpath>/<name>/rootfs" as the target prefix. | |
1966 | */ | |
1967 | ret = snprintf(path, MAXPATHLEN, "%s/%s/rootfs", lxcpath, lxc_name); | |
1968 | if (ret < 0 || ret >= MAXPATHLEN) | |
80a881b2 SH |
1969 | goto skipvarlib; |
1970 | ||
1971 | aux = strstr(mntent->mnt_dir, path); | |
1972 | if (aux) { | |
1973 | offset = strlen(path); | |
1974 | goto skipabs; | |
1975 | } | |
1976 | ||
1977 | skipvarlib: | |
013bd428 DL |
1978 | aux = strstr(mntent->mnt_dir, rootfs->path); |
1979 | if (!aux) { | |
bdd2b34c | 1980 | WARN("Ignoring mount point \"%s\"", mntent->mnt_dir); |
db4aba38 | 1981 | return ret; |
013bd428 | 1982 | } |
80a881b2 SH |
1983 | offset = strlen(rootfs->path); |
1984 | ||
1985 | skipabs: | |
bdd2b34c CB |
1986 | ret = snprintf(path, MAXPATHLEN, "%s/%s", rootfs->mount, aux + offset); |
1987 | if (ret < 0 || ret >= MAXPATHLEN) | |
a17b1e65 | 1988 | return -1; |
a17b1e65 | 1989 | |
0a2dddd4 | 1990 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef | 1991 | } |
d330fe7b | 1992 | |
4e4ca161 | 1993 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
0a2dddd4 CB |
1994 | const struct lxc_rootfs *rootfs, |
1995 | const char *lxc_name, | |
1996 | const char *lxc_path) | |
911324ef DL |
1997 | { |
1998 | char path[MAXPATHLEN]; | |
911324ef | 1999 | int ret; |
d330fe7b | 2000 | |
34cfffb3 | 2001 | /* relative to root mount point */ |
6e46cc0d | 2002 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs->mount, mntent->mnt_dir); |
1433c9f9 | 2003 | if (ret < 0 || ret >= sizeof(path)) { |
9ba8130c SH |
2004 | ERROR("path name too long"); |
2005 | return -1; | |
2006 | } | |
911324ef | 2007 | |
0a2dddd4 | 2008 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef DL |
2009 | } |
2010 | ||
80a881b2 | 2011 | static int mount_file_entries(const struct lxc_rootfs *rootfs, FILE *file, |
1ae3c19f | 2012 | const char *lxc_name, const char *lxc_path) |
911324ef | 2013 | { |
aaf901be AM |
2014 | struct mntent mntent; |
2015 | char buf[4096]; | |
911324ef | 2016 | int ret = -1; |
e76b8764 | 2017 | |
aaf901be | 2018 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
1ae3c19f CB |
2019 | if (!rootfs->path) |
2020 | ret = mount_entry_on_systemfs(&mntent); | |
2021 | else if (mntent.mnt_dir[0] != '/') | |
2022 | ret = mount_entry_on_relative_rootfs(&mntent, rootfs, | |
2023 | lxc_name, lxc_path); | |
2024 | else | |
2025 | ret = mount_entry_on_absolute_rootfs(&mntent, rootfs, | |
2026 | lxc_name, lxc_path); | |
2027 | if (ret < 0) | |
2028 | return -1; | |
0ad19a3f | 2029 | } |
2030 | ret = 0; | |
cd54d859 | 2031 | |
1ae3c19f | 2032 | INFO("Set up mount entries"); |
e7938e9e MN |
2033 | return ret; |
2034 | } | |
2035 | ||
80a881b2 | 2036 | static int setup_mount(const struct lxc_rootfs *rootfs, const char *fstab, |
42dff448 | 2037 | const char *lxc_name, const char *lxc_path) |
e7938e9e | 2038 | { |
42dff448 | 2039 | FILE *f; |
e7938e9e MN |
2040 | int ret; |
2041 | ||
2042 | if (!fstab) | |
2043 | return 0; | |
2044 | ||
42dff448 CB |
2045 | f = setmntent(fstab, "r"); |
2046 | if (!f) { | |
2047 | SYSERROR("Failed to open \"%s\"", fstab); | |
e7938e9e MN |
2048 | return -1; |
2049 | } | |
2050 | ||
42dff448 CB |
2051 | ret = mount_file_entries(rootfs, f, lxc_name, lxc_path); |
2052 | if (ret < 0) | |
2053 | ERROR("Failed to set up mount entries"); | |
e7938e9e | 2054 | |
42dff448 | 2055 | endmntent(f); |
0ad19a3f | 2056 | return ret; |
2057 | } | |
2058 | ||
5ef5c9a3 | 2059 | FILE *make_anonymous_mount_file(struct lxc_list *mount) |
e7938e9e | 2060 | { |
5ef5c9a3 | 2061 | int ret; |
e7938e9e | 2062 | char *mount_entry; |
5ef5c9a3 | 2063 | struct lxc_list *iterator; |
6bd04140 | 2064 | FILE *f; |
5ef5c9a3 CB |
2065 | int fd = -1; |
2066 | ||
2067 | fd = memfd_create("lxc_mount_file", MFD_CLOEXEC); | |
2068 | if (fd < 0) { | |
2069 | if (errno != ENOSYS) | |
2070 | return NULL; | |
6bd04140 CB |
2071 | f = tmpfile(); |
2072 | TRACE("Created temporary mount file"); | |
5ef5c9a3 | 2073 | } else { |
6bd04140 CB |
2074 | f = fdopen(fd, "r+"); |
2075 | TRACE("Created anonymous mount file"); | |
5ef5c9a3 | 2076 | } |
e7938e9e | 2077 | |
6bd04140 CB |
2078 | if (!f) { |
2079 | SYSERROR("Could not create mount file"); | |
5ef5c9a3 CB |
2080 | if (fd != -1) |
2081 | close(fd); | |
9fc7f8c0 | 2082 | return NULL; |
e7938e9e MN |
2083 | } |
2084 | ||
2085 | lxc_list_for_each(iterator, mount) { | |
2086 | mount_entry = iterator->elem; | |
6bd04140 | 2087 | ret = fprintf(f, "%s\n", mount_entry); |
5ef5c9a3 | 2088 | if (ret < strlen(mount_entry)) |
6bd04140 | 2089 | WARN("Could not write mount entry to mount file"); |
5ef5c9a3 CB |
2090 | } |
2091 | ||
6bd04140 CB |
2092 | ret = fseek(f, 0, SEEK_SET); |
2093 | if (ret < 0) { | |
2094 | SYSERROR("Failed to seek mount file"); | |
2095 | fclose(f); | |
5ef5c9a3 | 2096 | return NULL; |
e7938e9e MN |
2097 | } |
2098 | ||
6bd04140 | 2099 | return f; |
9fc7f8c0 TA |
2100 | } |
2101 | ||
5ef5c9a3 CB |
2102 | static int setup_mount_entries(const struct lxc_rootfs *rootfs, |
2103 | struct lxc_list *mount, const char *lxc_name, | |
2104 | const char *lxc_path) | |
9fc7f8c0 | 2105 | { |
19b5d755 | 2106 | FILE *f; |
9fc7f8c0 TA |
2107 | int ret; |
2108 | ||
19b5d755 CB |
2109 | f = make_anonymous_mount_file(mount); |
2110 | if (!f) | |
9fc7f8c0 | 2111 | return -1; |
e7938e9e | 2112 | |
19b5d755 | 2113 | ret = mount_file_entries(rootfs, f, lxc_name, lxc_path); |
e7938e9e | 2114 | |
19b5d755 | 2115 | fclose(f); |
e7938e9e MN |
2116 | return ret; |
2117 | } | |
2118 | ||
bab88e68 CS |
2119 | static int parse_cap(const char *cap) |
2120 | { | |
2121 | char *ptr = NULL; | |
84760c11 | 2122 | size_t i; |
2123 | int capid = -1; | |
bab88e68 | 2124 | |
7035407c DE |
2125 | if (!strcmp(cap, "none")) |
2126 | return -2; | |
2127 | ||
bab88e68 CS |
2128 | for (i = 0; i < sizeof(caps_opt)/sizeof(caps_opt[0]); i++) { |
2129 | ||
2130 | if (strcmp(cap, caps_opt[i].name)) | |
2131 | continue; | |
2132 | ||
2133 | capid = caps_opt[i].value; | |
2134 | break; | |
2135 | } | |
2136 | ||
2137 | if (capid < 0) { | |
2138 | /* try to see if it's numeric, so the user may specify | |
2139 | * capabilities that the running kernel knows about but | |
2140 | * we don't */ | |
2141 | errno = 0; | |
2142 | capid = strtol(cap, &ptr, 10); | |
2143 | if (!ptr || *ptr != '\0' || errno != 0) | |
2144 | /* not a valid number */ | |
2145 | capid = -1; | |
2146 | else if (capid > lxc_caps_last_cap()) | |
2147 | /* we have a number but it's not a valid | |
2148 | * capability */ | |
2149 | capid = -1; | |
2150 | } | |
2151 | ||
2152 | return capid; | |
2153 | } | |
2154 | ||
0769b82a CS |
2155 | int in_caplist(int cap, struct lxc_list *caps) |
2156 | { | |
2157 | struct lxc_list *iterator; | |
2158 | int capid; | |
2159 | ||
2160 | lxc_list_for_each(iterator, caps) { | |
2161 | capid = parse_cap(iterator->elem); | |
2162 | if (capid == cap) | |
2163 | return 1; | |
2164 | } | |
2165 | ||
2166 | return 0; | |
2167 | } | |
2168 | ||
81810dd1 DL |
2169 | static int setup_caps(struct lxc_list *caps) |
2170 | { | |
2171 | struct lxc_list *iterator; | |
2172 | char *drop_entry; | |
bab88e68 | 2173 | int capid; |
81810dd1 DL |
2174 | |
2175 | lxc_list_for_each(iterator, caps) { | |
2176 | ||
2177 | drop_entry = iterator->elem; | |
2178 | ||
bab88e68 | 2179 | capid = parse_cap(drop_entry); |
d55bc1ad | 2180 | |
81810dd1 | 2181 | if (capid < 0) { |
1e11be34 DL |
2182 | ERROR("unknown capability %s", drop_entry); |
2183 | return -1; | |
81810dd1 DL |
2184 | } |
2185 | ||
2186 | DEBUG("drop capability '%s' (%d)", drop_entry, capid); | |
2187 | ||
2188 | if (prctl(PR_CAPBSET_DROP, capid, 0, 0, 0)) { | |
3ec1648d SH |
2189 | SYSERROR("failed to remove %s capability", drop_entry); |
2190 | return -1; | |
2191 | } | |
81810dd1 DL |
2192 | |
2193 | } | |
2194 | ||
1fb86a7c SH |
2195 | DEBUG("capabilities have been setup"); |
2196 | ||
2197 | return 0; | |
2198 | } | |
2199 | ||
2200 | static int dropcaps_except(struct lxc_list *caps) | |
2201 | { | |
2202 | struct lxc_list *iterator; | |
2203 | char *keep_entry; | |
1fb86a7c SH |
2204 | int i, capid; |
2205 | int numcaps = lxc_caps_last_cap() + 1; | |
959aee9c | 2206 | INFO("found %d capabilities", numcaps); |
1fb86a7c | 2207 | |
2caf9a97 SH |
2208 | if (numcaps <= 0 || numcaps > 200) |
2209 | return -1; | |
2210 | ||
1fb86a7c SH |
2211 | // caplist[i] is 1 if we keep capability i |
2212 | int *caplist = alloca(numcaps * sizeof(int)); | |
2213 | memset(caplist, 0, numcaps * sizeof(int)); | |
2214 | ||
2215 | lxc_list_for_each(iterator, caps) { | |
2216 | ||
2217 | keep_entry = iterator->elem; | |
2218 | ||
bab88e68 | 2219 | capid = parse_cap(keep_entry); |
1fb86a7c | 2220 | |
7035407c DE |
2221 | if (capid == -2) |
2222 | continue; | |
2223 | ||
1fb86a7c SH |
2224 | if (capid < 0) { |
2225 | ERROR("unknown capability %s", keep_entry); | |
2226 | return -1; | |
2227 | } | |
2228 | ||
8255688a | 2229 | DEBUG("keep capability '%s' (%d)", keep_entry, capid); |
1fb86a7c SH |
2230 | |
2231 | caplist[capid] = 1; | |
2232 | } | |
2233 | for (i=0; i<numcaps; i++) { | |
2234 | if (caplist[i]) | |
2235 | continue; | |
2236 | if (prctl(PR_CAPBSET_DROP, i, 0, 0, 0)) { | |
3ec1648d SH |
2237 | SYSERROR("failed to remove capability %d", i); |
2238 | return -1; | |
2239 | } | |
1fb86a7c SH |
2240 | } |
2241 | ||
2242 | DEBUG("capabilities have been setup"); | |
81810dd1 DL |
2243 | |
2244 | return 0; | |
2245 | } | |
2246 | ||
0ad19a3f | 2247 | static int setup_hw_addr(char *hwaddr, const char *ifname) |
2248 | { | |
2249 | struct sockaddr sockaddr; | |
2250 | struct ifreq ifr; | |
fad6ef95 | 2251 | int ret, fd, saved_errno; |
0ad19a3f | 2252 | |
3cfc0f3a MN |
2253 | ret = lxc_convert_mac(hwaddr, &sockaddr); |
2254 | if (ret) { | |
2255 | ERROR("mac address '%s' conversion failed : %s", | |
2256 | hwaddr, strerror(-ret)); | |
0ad19a3f | 2257 | return -1; |
2258 | } | |
2259 | ||
2260 | memcpy(ifr.ifr_name, ifname, IFNAMSIZ); | |
5da6aa8c | 2261 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
0ad19a3f | 2262 | memcpy((char *) &ifr.ifr_hwaddr, (char *) &sockaddr, sizeof(sockaddr)); |
2263 | ||
2264 | fd = socket(AF_INET, SOCK_DGRAM, 0); | |
2265 | if (fd < 0) { | |
3ab87b66 | 2266 | ERROR("socket failure : %s", strerror(errno)); |
0ad19a3f | 2267 | return -1; |
2268 | } | |
2269 | ||
2270 | ret = ioctl(fd, SIOCSIFHWADDR, &ifr); | |
fad6ef95 | 2271 | saved_errno = errno; |
0ad19a3f | 2272 | close(fd); |
2273 | if (ret) | |
fad6ef95 | 2274 | ERROR("ioctl failure : %s", strerror(saved_errno)); |
0ad19a3f | 2275 | |
5da6aa8c | 2276 | DEBUG("mac address '%s' on '%s' has been setup", hwaddr, ifr.ifr_name); |
cd54d859 | 2277 | |
0ad19a3f | 2278 | return ret; |
2279 | } | |
2280 | ||
82d5ae15 | 2281 | static int setup_ipv4_addr(struct lxc_list *ip, int ifindex) |
0ad19a3f | 2282 | { |
82d5ae15 DL |
2283 | struct lxc_list *iterator; |
2284 | struct lxc_inetdev *inetdev; | |
3cfc0f3a | 2285 | int err; |
0ad19a3f | 2286 | |
82d5ae15 DL |
2287 | lxc_list_for_each(iterator, ip) { |
2288 | ||
2289 | inetdev = iterator->elem; | |
2290 | ||
0093bb8c DL |
2291 | err = lxc_ipv4_addr_add(ifindex, &inetdev->addr, |
2292 | &inetdev->bcast, inetdev->prefix); | |
3cfc0f3a MN |
2293 | if (err) { |
2294 | ERROR("failed to setup_ipv4_addr ifindex %d : %s", | |
2295 | ifindex, strerror(-err)); | |
82d5ae15 DL |
2296 | return -1; |
2297 | } | |
2298 | } | |
2299 | ||
2300 | return 0; | |
0ad19a3f | 2301 | } |
2302 | ||
82d5ae15 | 2303 | static int setup_ipv6_addr(struct lxc_list *ip, int ifindex) |
0ad19a3f | 2304 | { |
82d5ae15 | 2305 | struct lxc_list *iterator; |
7fa9074f | 2306 | struct lxc_inet6dev *inet6dev; |
3cfc0f3a | 2307 | int err; |
0ad19a3f | 2308 | |
82d5ae15 DL |
2309 | lxc_list_for_each(iterator, ip) { |
2310 | ||
2311 | inet6dev = iterator->elem; | |
2312 | ||
b3df193c | 2313 | err = lxc_ipv6_addr_add(ifindex, &inet6dev->addr, |
0093bb8c DL |
2314 | &inet6dev->mcast, &inet6dev->acast, |
2315 | inet6dev->prefix); | |
3cfc0f3a MN |
2316 | if (err) { |
2317 | ERROR("failed to setup_ipv6_addr ifindex %d : %s", | |
2318 | ifindex, strerror(-err)); | |
82d5ae15 | 2319 | return -1; |
3cfc0f3a | 2320 | } |
82d5ae15 DL |
2321 | } |
2322 | ||
2323 | return 0; | |
0ad19a3f | 2324 | } |
2325 | ||
e337179a | 2326 | static int lxc_setup_netdev_in_child_namespaces(struct lxc_netdev *netdev) |
0ad19a3f | 2327 | { |
0ad19a3f | 2328 | char ifname[IFNAMSIZ]; |
3cfc0f3a | 2329 | int err; |
d1826cf1 CB |
2330 | const char *net_type_name; |
2331 | char *current_ifname = ifname; | |
0ad19a3f | 2332 | |
82d5ae15 DL |
2333 | /* empty network namespace */ |
2334 | if (!netdev->ifindex) { | |
b0efbac4 | 2335 | if (netdev->flags & IFF_UP) { |
d472214b | 2336 | err = lxc_netdev_up("lo"); |
3cfc0f3a MN |
2337 | if (err) { |
2338 | ERROR("failed to set the loopback up : %s", | |
2339 | strerror(-err)); | |
82d5ae15 DL |
2340 | return -1; |
2341 | } | |
82d5ae15 | 2342 | } |
d1826cf1 CB |
2343 | |
2344 | if (netdev->type == LXC_NET_EMPTY) | |
2345 | return 0; | |
2346 | ||
2347 | if (netdev->type == LXC_NET_NONE) | |
40790553 | 2348 | return 0; |
d1826cf1 CB |
2349 | |
2350 | if (netdev->type != LXC_NET_VETH) { | |
2351 | net_type_name = lxc_net_type_to_str(netdev->type); | |
2352 | ERROR("%s networks are not supported for containers " | |
2353 | "not setup up by privileged users", | |
2354 | net_type_name); | |
2355 | return -1; | |
2356 | } | |
2357 | ||
40790553 | 2358 | netdev->ifindex = if_nametoindex(netdev->name); |
0ad19a3f | 2359 | } |
13954cce | 2360 | |
b466dc33 | 2361 | /* get the new ifindex in case of physical netdev */ |
40790553 | 2362 | if (netdev->type == LXC_NET_PHYS) { |
b466dc33 BP |
2363 | if (!(netdev->ifindex = if_nametoindex(netdev->link))) { |
2364 | ERROR("failed to get ifindex for %s", | |
2365 | netdev->link); | |
2366 | return -1; | |
2367 | } | |
40790553 | 2368 | } |
b466dc33 | 2369 | |
82d5ae15 DL |
2370 | /* retrieve the name of the interface */ |
2371 | if (!if_indextoname(netdev->ifindex, current_ifname)) { | |
36eb9bde | 2372 | ERROR("no interface corresponding to index '%d'", |
82d5ae15 | 2373 | netdev->ifindex); |
0ad19a3f | 2374 | return -1; |
2375 | } | |
13954cce | 2376 | |
018ef520 | 2377 | /* default: let the system to choose one interface name */ |
9d083402 | 2378 | if (!netdev->name) |
fb6d9b2f DL |
2379 | netdev->name = netdev->type == LXC_NET_PHYS ? |
2380 | netdev->link : "eth%d"; | |
018ef520 | 2381 | |
82d5ae15 | 2382 | /* rename the interface name */ |
40790553 SH |
2383 | if (strcmp(ifname, netdev->name) != 0) { |
2384 | err = lxc_netdev_rename_by_name(ifname, netdev->name); | |
2385 | if (err) { | |
2386 | ERROR("failed to rename %s->%s : %s", ifname, netdev->name, | |
2387 | strerror(-err)); | |
2388 | return -1; | |
2389 | } | |
018ef520 DL |
2390 | } |
2391 | ||
2392 | /* Re-read the name of the interface because its name has changed | |
2393 | * and would be automatically allocated by the system | |
2394 | */ | |
82d5ae15 | 2395 | if (!if_indextoname(netdev->ifindex, current_ifname)) { |
018ef520 | 2396 | ERROR("no interface corresponding to index '%d'", |
82d5ae15 | 2397 | netdev->ifindex); |
018ef520 | 2398 | return -1; |
0ad19a3f | 2399 | } |
2400 | ||
82d5ae15 DL |
2401 | /* set a mac address */ |
2402 | if (netdev->hwaddr) { | |
2403 | if (setup_hw_addr(netdev->hwaddr, current_ifname)) { | |
36eb9bde | 2404 | ERROR("failed to setup hw address for '%s'", |
82d5ae15 | 2405 | current_ifname); |
0ad19a3f | 2406 | return -1; |
2407 | } | |
2408 | } | |
2409 | ||
82d5ae15 DL |
2410 | /* setup ipv4 addresses on the interface */ |
2411 | if (setup_ipv4_addr(&netdev->ipv4, netdev->ifindex)) { | |
36eb9bde | 2412 | ERROR("failed to setup ip addresses for '%s'", |
0ad19a3f | 2413 | ifname); |
2414 | return -1; | |
2415 | } | |
2416 | ||
82d5ae15 DL |
2417 | /* setup ipv6 addresses on the interface */ |
2418 | if (setup_ipv6_addr(&netdev->ipv6, netdev->ifindex)) { | |
36eb9bde | 2419 | ERROR("failed to setup ipv6 addresses for '%s'", |
0ad19a3f | 2420 | ifname); |
2421 | return -1; | |
2422 | } | |
2423 | ||
82d5ae15 | 2424 | /* set the network device up */ |
b0efbac4 | 2425 | if (netdev->flags & IFF_UP) { |
3cfc0f3a MN |
2426 | int err; |
2427 | ||
d472214b | 2428 | err = lxc_netdev_up(current_ifname); |
3cfc0f3a MN |
2429 | if (err) { |
2430 | ERROR("failed to set '%s' up : %s", current_ifname, | |
2431 | strerror(-err)); | |
0ad19a3f | 2432 | return -1; |
2433 | } | |
2434 | ||
2435 | /* the network is up, make the loopback up too */ | |
d472214b | 2436 | err = lxc_netdev_up("lo"); |
3cfc0f3a MN |
2437 | if (err) { |
2438 | ERROR("failed to set the loopback up : %s", | |
2439 | strerror(-err)); | |
0ad19a3f | 2440 | return -1; |
2441 | } | |
2442 | } | |
2443 | ||
f8fee0e2 MK |
2444 | /* We can only set up the default routes after bringing |
2445 | * up the interface, sine bringing up the interface adds | |
2446 | * the link-local routes and we can't add a default | |
2447 | * route if the gateway is not reachable. */ | |
2448 | ||
2449 | /* setup ipv4 gateway on the interface */ | |
2450 | if (netdev->ipv4_gateway) { | |
2451 | if (!(netdev->flags & IFF_UP)) { | |
2452 | ERROR("Cannot add ipv4 gateway for %s when not bringing up the interface", ifname); | |
2453 | return -1; | |
2454 | } | |
2455 | ||
2456 | if (lxc_list_empty(&netdev->ipv4)) { | |
2457 | ERROR("Cannot add ipv4 gateway for %s when not assigning an address", ifname); | |
2458 | return -1; | |
2459 | } | |
2460 | ||
2461 | err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway); | |
2462 | if (err) { | |
fc739df5 SG |
2463 | err = lxc_ipv4_dest_add(netdev->ifindex, netdev->ipv4_gateway); |
2464 | if (err) { | |
2465 | ERROR("failed to add ipv4 dest for '%s': %s", | |
2466 | ifname, strerror(-err)); | |
2467 | } | |
2468 | ||
2469 | err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway); | |
2470 | if (err) { | |
2471 | ERROR("failed to setup ipv4 gateway for '%s': %s", | |
2472 | ifname, strerror(-err)); | |
2473 | if (netdev->ipv4_gateway_auto) { | |
2474 | char buf[INET_ADDRSTRLEN]; | |
2475 | inet_ntop(AF_INET, netdev->ipv4_gateway, buf, sizeof(buf)); | |
2476 | ERROR("tried to set autodetected ipv4 gateway '%s'", buf); | |
2477 | } | |
2478 | return -1; | |
19a26f82 | 2479 | } |
f8fee0e2 MK |
2480 | } |
2481 | } | |
2482 | ||
2483 | /* setup ipv6 gateway on the interface */ | |
2484 | if (netdev->ipv6_gateway) { | |
2485 | if (!(netdev->flags & IFF_UP)) { | |
2486 | ERROR("Cannot add ipv6 gateway for %s when not bringing up the interface", ifname); | |
2487 | return -1; | |
2488 | } | |
2489 | ||
2490 | if (lxc_list_empty(&netdev->ipv6) && !IN6_IS_ADDR_LINKLOCAL(netdev->ipv6_gateway)) { | |
2491 | ERROR("Cannot add ipv6 gateway for %s when not assigning an address", ifname); | |
2492 | return -1; | |
2493 | } | |
2494 | ||
2495 | err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway); | |
2496 | if (err) { | |
fc739df5 SG |
2497 | err = lxc_ipv6_dest_add(netdev->ifindex, netdev->ipv6_gateway); |
2498 | if (err) { | |
2499 | ERROR("failed to add ipv6 dest for '%s': %s", | |
f8fee0e2 | 2500 | ifname, strerror(-err)); |
19a26f82 | 2501 | } |
fc739df5 SG |
2502 | |
2503 | err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway); | |
2504 | if (err) { | |
2505 | ERROR("failed to setup ipv6 gateway for '%s': %s", | |
2506 | ifname, strerror(-err)); | |
2507 | if (netdev->ipv6_gateway_auto) { | |
2508 | char buf[INET6_ADDRSTRLEN]; | |
2509 | inet_ntop(AF_INET6, netdev->ipv6_gateway, buf, sizeof(buf)); | |
2510 | ERROR("tried to set autodetected ipv6 gateway '%s'", buf); | |
2511 | } | |
2512 | return -1; | |
2513 | } | |
f8fee0e2 MK |
2514 | } |
2515 | } | |
2516 | ||
cd54d859 DL |
2517 | DEBUG("'%s' has been setup", current_ifname); |
2518 | ||
0ad19a3f | 2519 | return 0; |
2520 | } | |
2521 | ||
e337179a CB |
2522 | static int lxc_setup_networks_in_child_namespaces(const struct lxc_conf *conf, |
2523 | struct lxc_list *network) | |
0ad19a3f | 2524 | { |
82d5ae15 | 2525 | struct lxc_list *iterator; |
82d5ae15 | 2526 | struct lxc_netdev *netdev; |
0ad19a3f | 2527 | |
c302b476 CB |
2528 | lxc_log_configured_netdevs(conf); |
2529 | ||
5f4535a3 | 2530 | lxc_list_for_each(iterator, network) { |
5f4535a3 | 2531 | netdev = iterator->elem; |
82d5ae15 | 2532 | |
f9373e40 CB |
2533 | /* REMOVE in LXC 3.0 */ |
2534 | if (netdev->idx < 0) { | |
2535 | ERROR("WARNING: using \"lxc.network.*\" keys to define " | |
2536 | "networks is DEPRECATED, please switch to using " | |
2537 | "\"lxc.net.[i].* keys\""); | |
2538 | } | |
2539 | ||
e337179a | 2540 | if (lxc_setup_netdev_in_child_namespaces(netdev)) { |
82d5ae15 DL |
2541 | ERROR("failed to setup netdev"); |
2542 | return -1; | |
2543 | } | |
2544 | } | |
cd54d859 | 2545 | |
5f4535a3 DL |
2546 | if (!lxc_list_empty(network)) |
2547 | INFO("network has been setup"); | |
cd54d859 DL |
2548 | |
2549 | return 0; | |
0ad19a3f | 2550 | } |
2551 | ||
c6d09e15 WB |
2552 | static int parse_resource(const char *res) { |
2553 | size_t i; | |
2554 | int resid = -1; | |
2555 | ||
2556 | for (i = 0; i < sizeof(limit_opt)/sizeof(limit_opt[0]); ++i) { | |
2557 | if (strcmp(res, limit_opt[i].name) == 0) | |
2558 | return limit_opt[i].value; | |
2559 | } | |
2560 | ||
2561 | /* try to see if it's numeric, so the user may specify | |
2562 | * resources that the running kernel knows about but | |
2563 | * we don't */ | |
2564 | if (lxc_safe_int(res, &resid) == 0) | |
2565 | return resid; | |
2566 | return -1; | |
2567 | } | |
2568 | ||
2569 | int setup_resource_limits(struct lxc_list *limits, pid_t pid) { | |
2570 | struct lxc_list *it; | |
2571 | struct lxc_limit *lim; | |
2572 | int resid; | |
2573 | ||
2574 | lxc_list_for_each(it, limits) { | |
2575 | lim = it->elem; | |
2576 | ||
2577 | resid = parse_resource(lim->resource); | |
2578 | if (resid < 0) { | |
2579 | ERROR("unknown resource %s", lim->resource); | |
2580 | return -1; | |
2581 | } | |
2582 | ||
2583 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) { | |
2584 | ERROR("failed to set limit %s: %s", lim->resource, strerror(errno)); | |
2585 | return -1; | |
2586 | } | |
2587 | } | |
2588 | return 0; | |
2589 | } | |
2590 | ||
2af6bd1b | 2591 | /* try to move physical nics to the init netns */ |
5610055a | 2592 | void lxc_restore_phys_nics_to_netns(int netnsfd, struct lxc_conf *conf) |
2af6bd1b | 2593 | { |
64d2fcb5 | 2594 | int i, oldfd; |
4ec31c52 | 2595 | char ifname[IFNAMSIZ]; |
2af6bd1b | 2596 | |
5610055a | 2597 | if (netnsfd < 0 || conf->num_savednics == 0) |
2af6bd1b SH |
2598 | return; |
2599 | ||
64d2fcb5 | 2600 | INFO("Running to reset %d nic names.", conf->num_savednics); |
5610055a | 2601 | |
64d2fcb5 CB |
2602 | oldfd = lxc_preserve_ns(getpid(), "net"); |
2603 | if (oldfd < 0) { | |
2604 | SYSERROR("Failed to open monitor netns fd."); | |
2af6bd1b SH |
2605 | return; |
2606 | } | |
64d2fcb5 | 2607 | |
2af6bd1b SH |
2608 | if (setns(netnsfd, 0) != 0) { |
2609 | SYSERROR("Failed to enter container netns to reset nics"); | |
2610 | close(oldfd); | |
2611 | return; | |
2612 | } | |
2613 | for (i=0; i<conf->num_savednics; i++) { | |
2614 | struct saved_nic *s = &conf->saved_nics[i]; | |
f2e206ff | 2615 | /* retrieve the name of the interface */ |
2616 | if (!if_indextoname(s->ifindex, ifname)) { | |
2617 | WARN("no interface corresponding to index '%d'", s->ifindex); | |
2618 | continue; | |
2619 | } | |
5610055a | 2620 | if (lxc_netdev_move_by_name(ifname, 1, s->orig_name)) |
f2e206ff | 2621 | WARN("Error moving nic name:%s back to host netns", ifname); |
5610055a | 2622 | free(s->orig_name); |
2af6bd1b | 2623 | } |
5610055a WB |
2624 | conf->num_savednics = 0; |
2625 | ||
2af6bd1b SH |
2626 | if (setns(oldfd, 0) != 0) |
2627 | SYSERROR("Failed to re-enter monitor's netns"); | |
2628 | close(oldfd); | |
2629 | } | |
2630 | ||
ae9242c8 SH |
2631 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2632 | ||
7b379ab3 | 2633 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2634 | { |
7b379ab3 | 2635 | struct lxc_conf *new; |
26ddeedd | 2636 | int i; |
7b379ab3 | 2637 | |
13277ec4 | 2638 | new = malloc(sizeof(*new)); |
7b379ab3 | 2639 | if (!new) { |
13277ec4 | 2640 | ERROR("lxc_conf_init : %s", strerror(errno)); |
7b379ab3 MN |
2641 | return NULL; |
2642 | } | |
2643 | memset(new, 0, sizeof(*new)); | |
2644 | ||
4b73005c | 2645 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
cccc74b5 | 2646 | new->personality = -1; |
124fa0a8 | 2647 | new->autodev = 1; |
596a818d DE |
2648 | new->console.log_path = NULL; |
2649 | new->console.log_fd = -1; | |
28a4b0e5 | 2650 | new->console.path = NULL; |
63376d7d | 2651 | new->console.peer = -1; |
b5159817 DE |
2652 | new->console.peerpty.busy = -1; |
2653 | new->console.peerpty.master = -1; | |
2654 | new->console.peerpty.slave = -1; | |
63376d7d DL |
2655 | new->console.master = -1; |
2656 | new->console.slave = -1; | |
2657 | new->console.name[0] = '\0'; | |
d2e30e99 | 2658 | new->maincmd_fd = -1; |
76a26f55 | 2659 | new->nbd_idx = -1; |
54c30e29 | 2660 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 2661 | if (!new->rootfs.mount) { |
13277ec4 | 2662 | ERROR("lxc_conf_init : %s", strerror(errno)); |
53f3f048 SH |
2663 | free(new); |
2664 | return NULL; | |
2665 | } | |
858377e4 | 2666 | new->logfd = -1; |
7b379ab3 MN |
2667 | lxc_list_init(&new->cgroup); |
2668 | lxc_list_init(&new->network); | |
2669 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2670 | lxc_list_init(&new->caps); |
1fb86a7c | 2671 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2672 | lxc_list_init(&new->id_map); |
f979ac15 | 2673 | lxc_list_init(&new->includes); |
4184c3e1 | 2674 | lxc_list_init(&new->aliens); |
7c661726 | 2675 | lxc_list_init(&new->environment); |
c6d09e15 | 2676 | lxc_list_init(&new->limits); |
26ddeedd SH |
2677 | for (i=0; i<NUM_LXC_HOOKS; i++) |
2678 | lxc_list_init(&new->hooks[i]); | |
ee1e7aa0 | 2679 | lxc_list_init(&new->groups); |
fe4de9a6 DE |
2680 | new->lsm_aa_profile = NULL; |
2681 | new->lsm_se_context = NULL; | |
5112cd70 | 2682 | new->tmp_umount_proc = 0; |
7b379ab3 | 2683 | |
9f30a190 MM |
2684 | for (i = 0; i < LXC_NS_MAX; i++) |
2685 | new->inherit_ns_fd[i] = -1; | |
2686 | ||
72bb04e4 PT |
2687 | /* if running in a new user namespace, init and COMMAND |
2688 | * default to running as UID/GID 0 when using lxc-execute */ | |
2689 | new->init_uid = 0; | |
2690 | new->init_gid = 0; | |
2691 | ||
7b379ab3 | 2692 | return new; |
089cd8b8 DL |
2693 | } |
2694 | ||
a589434e | 2695 | static int instantiate_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2696 | { |
b0ee5983 CB |
2697 | char *veth1, *veth2; |
2698 | char veth1buf[IFNAMSIZ], veth2buf[IFNAMSIZ]; | |
b7b2fde4 CB |
2699 | int bridge_index, err; |
2700 | unsigned int mtu = 0; | |
13954cce | 2701 | |
8bee8851 | 2702 | if (netdev->priv.veth_attr.pair) { |
e892973e | 2703 | veth1 = netdev->priv.veth_attr.pair; |
8bee8851 WB |
2704 | if (handler->conf->reboot) |
2705 | lxc_netdev_delete_by_name(veth1); | |
2706 | } else { | |
9ba8130c SH |
2707 | err = snprintf(veth1buf, sizeof(veth1buf), "vethXXXXXX"); |
2708 | if (err >= sizeof(veth1buf)) { /* can't *really* happen, but... */ | |
2709 | ERROR("veth1 name too long"); | |
2710 | return -1; | |
2711 | } | |
a0265685 | 2712 | veth1 = lxc_mkifname(veth1buf); |
ad40563e ÇO |
2713 | if (!veth1) { |
2714 | ERROR("failed to allocate a temporary name"); | |
2715 | return -1; | |
2716 | } | |
74a2b586 JK |
2717 | /* store away for deconf */ |
2718 | memcpy(netdev->priv.veth_attr.veth1, veth1, IFNAMSIZ); | |
8634bc19 | 2719 | } |
82d5ae15 | 2720 | |
0e391e57 | 2721 | snprintf(veth2buf, sizeof(veth2buf), "vethXXXXXX"); |
a0265685 | 2722 | veth2 = lxc_mkifname(veth2buf); |
ad40563e | 2723 | if (!veth2) { |
82d5ae15 | 2724 | ERROR("failed to allocate a temporary name"); |
ad40563e | 2725 | goto out_delete; |
0ad19a3f | 2726 | } |
2727 | ||
3cfc0f3a MN |
2728 | err = lxc_veth_create(veth1, veth2); |
2729 | if (err) { | |
b0ee5983 CB |
2730 | ERROR("failed to create veth pair \"%s\" and \"%s\": %s", veth1, |
2731 | veth2, strerror(-err)); | |
ad40563e | 2732 | goto out_delete; |
0ad19a3f | 2733 | } |
13954cce | 2734 | |
49684c0b CS |
2735 | /* changing the high byte of the mac address to 0xfe, the bridge interface |
2736 | * will always keep the host's mac address and not take the mac address | |
2737 | * of a container */ | |
2738 | err = setup_private_host_hw_addr(veth1); | |
2739 | if (err) { | |
b0ee5983 CB |
2740 | ERROR("failed to change mac address of host interface \"%s\": %s", |
2741 | veth1, strerror(-err)); | |
49684c0b CS |
2742 | goto out_delete; |
2743 | } | |
2744 | ||
af651aa9 SN |
2745 | netdev->ifindex = if_nametoindex(veth2); |
2746 | if (!netdev->ifindex) { | |
b0ee5983 | 2747 | ERROR("failed to retrieve the index for \"%s\"", veth2); |
af651aa9 SN |
2748 | goto out_delete; |
2749 | } | |
2750 | ||
82d5ae15 | 2751 | if (netdev->mtu) { |
b7b2fde4 | 2752 | if (lxc_safe_uint(netdev->mtu, &mtu) < 0) |
b0ee5983 | 2753 | WARN("failed to parse mtu from"); |
b7b2fde4 | 2754 | else |
b0ee5983 | 2755 | INFO("retrieved mtu %d", mtu); |
e54864d3 | 2756 | } else if (netdev->link) { |
e9280f65 | 2757 | bridge_index = if_nametoindex(netdev->link); |
729e8bf6 CB |
2758 | if (bridge_index) { |
2759 | mtu = netdev_get_mtu(bridge_index); | |
b0ee5983 | 2760 | INFO("retrieved mtu %d from %s", mtu, netdev->link); |
729e8bf6 CB |
2761 | } else { |
2762 | mtu = netdev_get_mtu(netdev->ifindex); | |
b0ee5983 | 2763 | INFO("retrieved mtu %d from %s", mtu, veth2); |
729e8bf6 | 2764 | } |
e54864d3 NC |
2765 | } |
2766 | ||
2767 | if (mtu) { | |
2768 | err = lxc_netdev_set_mtu(veth1, mtu); | |
3cfc0f3a | 2769 | if (!err) |
e54864d3 | 2770 | err = lxc_netdev_set_mtu(veth2, mtu); |
3cfc0f3a | 2771 | if (err) { |
b0ee5983 CB |
2772 | ERROR("failed to set mtu \"%d\" for veth pair \"%s\" " |
2773 | "and \"%s\": %s", | |
e54864d3 | 2774 | mtu, veth1, veth2, strerror(-err)); |
eb14c10a | 2775 | goto out_delete; |
75d09f83 DL |
2776 | } |
2777 | } | |
2778 | ||
3cfc0f3a | 2779 | if (netdev->link) { |
c43cbc04 | 2780 | err = lxc_bridge_attach(handler->lxcpath, handler->name, netdev->link, veth1); |
3cfc0f3a | 2781 | if (err) { |
b0ee5983 CB |
2782 | ERROR("failed to attach \"%s\" to bridge \"%s\": %s", |
2783 | veth1, netdev->link, strerror(-err)); | |
3cfc0f3a MN |
2784 | goto out_delete; |
2785 | } | |
b0ee5983 | 2786 | INFO("attached \"%s\" to bridge \"%s\"", veth1, netdev->link); |
eb14c10a DL |
2787 | } |
2788 | ||
d472214b | 2789 | err = lxc_netdev_up(veth1); |
6e35af2e | 2790 | if (err) { |
b0ee5983 | 2791 | ERROR("failed to set \"%s\" up: %s", veth1, strerror(-err)); |
6e35af2e | 2792 | goto out_delete; |
0ad19a3f | 2793 | } |
2794 | ||
e3b4c4c4 | 2795 | if (netdev->upscript) { |
751d9dcd DL |
2796 | err = run_script(handler->name, "net", netdev->upscript, "up", |
2797 | "veth", veth1, (char*) NULL); | |
2798 | if (err) | |
e3b4c4c4 | 2799 | goto out_delete; |
e3b4c4c4 ST |
2800 | } |
2801 | ||
b0ee5983 CB |
2802 | DEBUG("instantiated veth \"%s/%s\", index is \"%d\"", veth1, veth2, |
2803 | netdev->ifindex); | |
82d5ae15 | 2804 | |
6ab9ab6d | 2805 | return 0; |
eb14c10a DL |
2806 | |
2807 | out_delete: | |
b316d209 CB |
2808 | if (netdev->ifindex != 0) |
2809 | lxc_netdev_delete_by_name(veth1); | |
f10fad2f | 2810 | if (!netdev->priv.veth_attr.pair) |
ad40563e | 2811 | free(veth1); |
f10fad2f | 2812 | free(veth2); |
6ab9ab6d | 2813 | return -1; |
13954cce | 2814 | } |
d957ae2d | 2815 | |
74a2b586 JK |
2816 | static int shutdown_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2817 | { | |
2818 | char *veth1; | |
2819 | int err; | |
2820 | ||
2821 | if (netdev->priv.veth_attr.pair) | |
2822 | veth1 = netdev->priv.veth_attr.pair; | |
2823 | else | |
2824 | veth1 = netdev->priv.veth_attr.veth1; | |
2825 | ||
2826 | if (netdev->downscript) { | |
2827 | err = run_script(handler->name, "net", netdev->downscript, | |
2828 | "down", "veth", veth1, (char*) NULL); | |
2829 | if (err) | |
2830 | return -1; | |
2831 | } | |
2832 | return 0; | |
2833 | } | |
2834 | ||
a589434e | 2835 | static int instantiate_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2836 | { |
0e391e57 | 2837 | char peerbuf[IFNAMSIZ], *peer; |
3cfc0f3a | 2838 | int err; |
d957ae2d MT |
2839 | |
2840 | if (!netdev->link) { | |
2841 | ERROR("no link specified for macvlan netdev"); | |
2842 | return -1; | |
2843 | } | |
13954cce | 2844 | |
9ba8130c SH |
2845 | err = snprintf(peerbuf, sizeof(peerbuf), "mcXXXXXX"); |
2846 | if (err >= sizeof(peerbuf)) | |
2847 | return -1; | |
82d5ae15 | 2848 | |
a0265685 | 2849 | peer = lxc_mkifname(peerbuf); |
ad40563e | 2850 | if (!peer) { |
82d5ae15 DL |
2851 | ERROR("failed to make a temporary name"); |
2852 | return -1; | |
0ad19a3f | 2853 | } |
2854 | ||
3cfc0f3a MN |
2855 | err = lxc_macvlan_create(netdev->link, peer, |
2856 | netdev->priv.macvlan_attr.mode); | |
2857 | if (err) { | |
2858 | ERROR("failed to create macvlan interface '%s' on '%s' : %s", | |
2859 | peer, netdev->link, strerror(-err)); | |
ad40563e | 2860 | goto out; |
0ad19a3f | 2861 | } |
2862 | ||
82d5ae15 DL |
2863 | netdev->ifindex = if_nametoindex(peer); |
2864 | if (!netdev->ifindex) { | |
36eb9bde | 2865 | ERROR("failed to retrieve the index for %s", peer); |
ad40563e | 2866 | goto out; |
22ebac19 | 2867 | } |
2868 | ||
e3b4c4c4 | 2869 | if (netdev->upscript) { |
751d9dcd DL |
2870 | err = run_script(handler->name, "net", netdev->upscript, "up", |
2871 | "macvlan", netdev->link, (char*) NULL); | |
2872 | if (err) | |
ad40563e | 2873 | goto out; |
e3b4c4c4 ST |
2874 | } |
2875 | ||
a589434e | 2876 | DEBUG("instantiated macvlan '%s', index is '%d' and mode '%d'", |
e892973e | 2877 | peer, netdev->ifindex, netdev->priv.macvlan_attr.mode); |
0ad19a3f | 2878 | |
d957ae2d | 2879 | return 0; |
ad40563e ÇO |
2880 | out: |
2881 | lxc_netdev_delete_by_name(peer); | |
2882 | free(peer); | |
2883 | return -1; | |
0ad19a3f | 2884 | } |
2885 | ||
74a2b586 JK |
2886 | static int shutdown_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2887 | { | |
2888 | int err; | |
2889 | ||
2890 | if (netdev->downscript) { | |
2891 | err = run_script(handler->name, "net", netdev->downscript, | |
2892 | "down", "macvlan", netdev->link, | |
2893 | (char*) NULL); | |
2894 | if (err) | |
2895 | return -1; | |
2896 | } | |
2897 | return 0; | |
2898 | } | |
2899 | ||
a589434e JN |
2900 | /* XXX: merge with instantiate_macvlan */ |
2901 | static int instantiate_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
26c39028 JHS |
2902 | { |
2903 | char peer[IFNAMSIZ]; | |
3cfc0f3a | 2904 | int err; |
82f58d03 | 2905 | static uint16_t vlan_cntr = 0; |
b7b2fde4 | 2906 | unsigned int mtu = 0; |
26c39028 JHS |
2907 | |
2908 | if (!netdev->link) { | |
2909 | ERROR("no link specified for vlan netdev"); | |
2910 | return -1; | |
2911 | } | |
2912 | ||
82f58d03 | 2913 | err = snprintf(peer, sizeof(peer), "vlan%d-%d", netdev->priv.vlan_attr.vid, vlan_cntr++); |
9ba8130c SH |
2914 | if (err >= sizeof(peer)) { |
2915 | ERROR("peer name too long"); | |
2916 | return -1; | |
2917 | } | |
26c39028 | 2918 | |
3cfc0f3a MN |
2919 | err = lxc_vlan_create(netdev->link, peer, netdev->priv.vlan_attr.vid); |
2920 | if (err) { | |
2921 | ERROR("failed to create vlan interface '%s' on '%s' : %s", | |
2922 | peer, netdev->link, strerror(-err)); | |
26c39028 JHS |
2923 | return -1; |
2924 | } | |
2925 | ||
2926 | netdev->ifindex = if_nametoindex(peer); | |
2927 | if (!netdev->ifindex) { | |
2928 | ERROR("failed to retrieve the ifindex for %s", peer); | |
b84f58b9 | 2929 | lxc_netdev_delete_by_name(peer); |
26c39028 JHS |
2930 | return -1; |
2931 | } | |
2932 | ||
a589434e | 2933 | DEBUG("instantiated vlan '%s', ifindex is '%d'", " vlan1000", |
e892973e | 2934 | netdev->ifindex); |
b4fb7de1 | 2935 | if (netdev->mtu) { |
b7b2fde4 CB |
2936 | if (lxc_safe_uint(netdev->mtu, &mtu) < 0) { |
2937 | ERROR("Failed to retrieve mtu from: '%d'/'%s'.", | |
2938 | netdev->ifindex, netdev->name); | |
2939 | return -1; | |
2940 | } | |
2941 | err = lxc_netdev_set_mtu(peer, mtu); | |
b4fb7de1 VL |
2942 | if (err) { |
2943 | ERROR("failed to set mtu '%s' for %s : %s", | |
2944 | netdev->mtu, peer, strerror(-err)); | |
2945 | lxc_netdev_delete_by_name(peer); | |
2946 | return -1; | |
2947 | } | |
2948 | } | |
e892973e | 2949 | |
26c39028 JHS |
2950 | return 0; |
2951 | } | |
2952 | ||
74a2b586 JK |
2953 | static int shutdown_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2954 | { | |
2955 | return 0; | |
2956 | } | |
2957 | ||
a589434e | 2958 | static int instantiate_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2959 | { |
6168e99f DL |
2960 | if (!netdev->link) { |
2961 | ERROR("no link specified for the physical interface"); | |
2962 | return -1; | |
2963 | } | |
2964 | ||
9d083402 | 2965 | netdev->ifindex = if_nametoindex(netdev->link); |
82d5ae15 | 2966 | if (!netdev->ifindex) { |
9d083402 | 2967 | ERROR("failed to retrieve the index for %s", netdev->link); |
0ad19a3f | 2968 | return -1; |
2969 | } | |
2970 | ||
e3b4c4c4 ST |
2971 | if (netdev->upscript) { |
2972 | int err; | |
751d9dcd DL |
2973 | err = run_script(handler->name, "net", netdev->upscript, |
2974 | "up", "phys", netdev->link, (char*) NULL); | |
2975 | if (err) | |
e3b4c4c4 | 2976 | return -1; |
e3b4c4c4 ST |
2977 | } |
2978 | ||
82d5ae15 | 2979 | return 0; |
0ad19a3f | 2980 | } |
2981 | ||
74a2b586 JK |
2982 | static int shutdown_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2983 | { | |
2984 | int err; | |
2985 | ||
2986 | if (netdev->downscript) { | |
2987 | err = run_script(handler->name, "net", netdev->downscript, | |
2988 | "down", "phys", netdev->link, (char*) NULL); | |
2989 | if (err) | |
2990 | return -1; | |
2991 | } | |
2992 | return 0; | |
2993 | } | |
2994 | ||
a589434e | 2995 | static int instantiate_none(struct lxc_handler *handler, struct lxc_netdev *netdev) |
26b797f3 SH |
2996 | { |
2997 | netdev->ifindex = 0; | |
2998 | return 0; | |
2999 | } | |
3000 | ||
a589434e | 3001 | static int instantiate_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 3002 | { |
82d5ae15 | 3003 | netdev->ifindex = 0; |
e3b4c4c4 ST |
3004 | if (netdev->upscript) { |
3005 | int err; | |
751d9dcd DL |
3006 | err = run_script(handler->name, "net", netdev->upscript, |
3007 | "up", "empty", (char*) NULL); | |
3008 | if (err) | |
e3b4c4c4 | 3009 | return -1; |
e3b4c4c4 | 3010 | } |
82d5ae15 | 3011 | return 0; |
0ad19a3f | 3012 | } |
3013 | ||
74a2b586 JK |
3014 | static int shutdown_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) |
3015 | { | |
3016 | int err; | |
3017 | ||
3018 | if (netdev->downscript) { | |
3019 | err = run_script(handler->name, "net", netdev->downscript, | |
3020 | "down", "empty", (char*) NULL); | |
3021 | if (err) | |
3022 | return -1; | |
3023 | } | |
3024 | return 0; | |
3025 | } | |
3026 | ||
26b797f3 SH |
3027 | static int shutdown_none(struct lxc_handler *handler, struct lxc_netdev *netdev) |
3028 | { | |
3029 | return 0; | |
3030 | } | |
3031 | ||
3032 | int lxc_requests_empty_network(struct lxc_handler *handler) | |
3033 | { | |
3034 | struct lxc_list *network = &handler->conf->network; | |
3035 | struct lxc_list *iterator; | |
3036 | struct lxc_netdev *netdev; | |
3037 | bool found_none = false, found_nic = false; | |
3038 | ||
3039 | if (lxc_list_empty(network)) | |
3040 | return 0; | |
3041 | ||
3042 | lxc_list_for_each(iterator, network) { | |
3043 | ||
3044 | netdev = iterator->elem; | |
3045 | ||
3046 | if (netdev->type == LXC_NET_NONE) | |
3047 | found_none = true; | |
3048 | else | |
3049 | found_nic = true; | |
3050 | } | |
3051 | if (found_none && !found_nic) | |
3052 | return 1; | |
3053 | return 0; | |
3054 | } | |
3055 | ||
e337179a | 3056 | int lxc_setup_networks_in_parent_namespaces(struct lxc_handler *handler) |
0ad19a3f | 3057 | { |
e337179a | 3058 | bool am_root; |
82d5ae15 | 3059 | struct lxc_netdev *netdev; |
e337179a CB |
3060 | struct lxc_list *iterator; |
3061 | struct lxc_list *network = &handler->conf->network; | |
cbef6c52 | 3062 | |
e337179a CB |
3063 | /* We need to be root. */ |
3064 | am_root = (getuid() == 0); | |
cbef6c52 SH |
3065 | if (!am_root) |
3066 | return 0; | |
0ad19a3f | 3067 | |
5f4535a3 | 3068 | lxc_list_for_each(iterator, network) { |
5f4535a3 | 3069 | netdev = iterator->elem; |
13954cce | 3070 | |
e337179a CB |
3071 | if (netdev->type < 0 || netdev->type > LXC_NET_MAXCONFTYPE) { |
3072 | ERROR("invalid network configuration type '%d'", | |
3073 | netdev->type); | |
56637458 CB |
3074 | return -1; |
3075 | } | |
3076 | ||
e337179a CB |
3077 | if (netdev->type != LXC_NET_MACVLAN && |
3078 | netdev->priv.macvlan_attr.mode) { | |
3079 | ERROR("Invalid macvlan.mode for a non-macvlan netdev"); | |
56637458 CB |
3080 | return -1; |
3081 | } | |
3082 | ||
e337179a CB |
3083 | if (netdev->type != LXC_NET_VETH && |
3084 | netdev->priv.veth_attr.pair) { | |
3085 | ERROR("Invalid veth pair for a non-veth netdev"); | |
56637458 CB |
3086 | return -1; |
3087 | } | |
3088 | ||
e337179a CB |
3089 | if (netdev->type != LXC_NET_VLAN && |
3090 | netdev->priv.vlan_attr.vid > 0) { | |
3091 | ERROR("Invalid vlan.id for a non-macvlan netdev"); | |
82d5ae15 DL |
3092 | return -1; |
3093 | } | |
0ad19a3f | 3094 | |
e3b4c4c4 | 3095 | if (netdev_conf[netdev->type](handler, netdev)) { |
82d5ae15 DL |
3096 | ERROR("failed to create netdev"); |
3097 | return -1; | |
3098 | } | |
e3b4c4c4 | 3099 | |
0ad19a3f | 3100 | } |
3101 | ||
3102 | return 0; | |
3103 | } | |
3104 | ||
358daf49 | 3105 | bool lxc_delete_network(struct lxc_handler *handler) |
7fef7a06 | 3106 | { |
e97946ae | 3107 | int ret; |
74a2b586 | 3108 | struct lxc_list *network = &handler->conf->network; |
7fef7a06 DL |
3109 | struct lxc_list *iterator; |
3110 | struct lxc_netdev *netdev; | |
358daf49 | 3111 | bool deleted_all = true; |
7fef7a06 DL |
3112 | |
3113 | lxc_list_for_each(iterator, network) { | |
3114 | netdev = iterator->elem; | |
d472214b | 3115 | |
74a2b586 | 3116 | if (netdev->ifindex != 0 && netdev->type == LXC_NET_PHYS) { |
d8f8e352 | 3117 | if (lxc_netdev_rename_by_index(netdev->ifindex, netdev->link)) |
358daf49 CB |
3118 | WARN("Failed to rename interface with index %d " |
3119 | "to its initial name \"%s\".", | |
3120 | netdev->ifindex, netdev->link); | |
d472214b | 3121 | continue; |
d8f8e352 | 3122 | } |
d472214b | 3123 | |
74a2b586 | 3124 | if (netdev_deconf[netdev->type](handler, netdev)) { |
e97946ae | 3125 | WARN("Failed to destroy netdev"); |
74a2b586 JK |
3126 | } |
3127 | ||
d8f8e352 DL |
3128 | /* Recent kernel remove the virtual interfaces when the network |
3129 | * namespace is destroyed but in case we did not moved the | |
3130 | * interface to the network namespace, we have to destroy it | |
3131 | */ | |
e97946ae CB |
3132 | if (netdev->ifindex != 0) { |
3133 | ret = lxc_netdev_delete_by_index(netdev->ifindex); | |
358daf49 CB |
3134 | if (-ret == ENODEV) { |
3135 | INFO("Interface \"%s\" with index %d already " | |
3136 | "deleted or existing in different network " | |
3137 | "namespace.", | |
3138 | netdev->name ? netdev->name : "(null)", | |
3139 | netdev->ifindex); | |
3140 | } else if (ret < 0) { | |
3141 | deleted_all = false; | |
3142 | WARN("Failed to remove interface \"%s\" with " | |
3143 | "index %d: %s.", | |
3144 | netdev->name ? netdev->name : "(null)", | |
3145 | netdev->ifindex, strerror(-ret)); | |
3146 | } else { | |
3147 | INFO("Removed interface \"%s\" with index %d.", | |
3148 | netdev->name ? netdev->name : "(null)", | |
3149 | netdev->ifindex); | |
3150 | } | |
e97946ae CB |
3151 | } |
3152 | ||
3153 | /* Explicitly delete host veth device to prevent lingering | |
3154 | * devices. We had issues in LXD around this. | |
3155 | */ | |
b316d209 | 3156 | if (netdev->ifindex != 0 && netdev->type == LXC_NET_VETH && !am_unpriv()) { |
358daf49 CB |
3157 | char *hostveth; |
3158 | if (netdev->priv.veth_attr.pair) { | |
e97946ae | 3159 | hostveth = netdev->priv.veth_attr.pair; |
358daf49 CB |
3160 | ret = lxc_netdev_delete_by_name(hostveth); |
3161 | if (ret < 0) { | |
3162 | WARN("Failed to remove interface \"%s\" from host: %s.", hostveth, strerror(-ret)); | |
3163 | } else { | |
3164 | INFO("Removed interface \"%s\" from host.", hostveth); | |
358daf49 CB |
3165 | } |
3166 | } else if (strlen(netdev->priv.veth_attr.veth1) > 0) { | |
e97946ae | 3167 | hostveth = netdev->priv.veth_attr.veth1; |
e97946ae | 3168 | ret = lxc_netdev_delete_by_name(hostveth); |
358daf49 CB |
3169 | if (ret < 0) { |
3170 | WARN("Failed to remove \"%s\" from host: %s.", hostveth, strerror(-ret)); | |
3171 | } else { | |
3172 | INFO("Removed interface \"%s\" from host.", hostveth); | |
3173 | memset((void *)&netdev->priv.veth_attr.veth1, 0, sizeof(netdev->priv.veth_attr.veth1)); | |
3174 | } | |
e97946ae CB |
3175 | } |
3176 | } | |
7fef7a06 | 3177 | } |
358daf49 CB |
3178 | |
3179 | return deleted_all; | |
7fef7a06 DL |
3180 | } |
3181 | ||
45e854dc SG |
3182 | #define LXC_USERNIC_PATH LIBEXECDIR "/lxc/lxc-user-nic" |
3183 | ||
fe1f672f | 3184 | /* lxc-user-nic returns "interface_name:interface_name\n" */ |
eab15c1e | 3185 | #define MAX_BUFFER_SIZE IFNAMSIZ * 2 + 2 |
c43cbc04 SH |
3186 | static int unpriv_assign_nic(const char *lxcpath, char *lxcname, |
3187 | struct lxc_netdev *netdev, pid_t pid) | |
cbef6c52 SH |
3188 | { |
3189 | pid_t child; | |
a7242d9a ÇO |
3190 | int bytes, pipefd[2]; |
3191 | char *token, *saveptr = NULL; | |
fe1f672f | 3192 | char buffer[MAX_BUFFER_SIZE]; |
091045f8 | 3193 | char netdev_link[IFNAMSIZ + 1]; |
cbef6c52 SH |
3194 | |
3195 | if (netdev->type != LXC_NET_VETH) { | |
3196 | ERROR("nic type %d not support for unprivileged use", | |
091045f8 | 3197 | netdev->type); |
cbef6c52 SH |
3198 | return -1; |
3199 | } | |
3200 | ||
091045f8 | 3201 | if (pipe(pipefd) < 0) { |
a7242d9a ÇO |
3202 | SYSERROR("pipe failed"); |
3203 | return -1; | |
3204 | } | |
3205 | ||
091045f8 CB |
3206 | child = fork(); |
3207 | if (child < 0) { | |
cbef6c52 | 3208 | SYSERROR("fork"); |
a7242d9a ÇO |
3209 | close(pipefd[0]); |
3210 | close(pipefd[1]); | |
3211 | return -1; | |
3212 | } | |
3213 | ||
3214 | if (child == 0) { // child | |
091045f8 CB |
3215 | /* Call lxc-user-nic pid type bridge. */ |
3216 | int ret; | |
3217 | char pidstr[LXC_NUMSTRLEN64]; | |
3218 | ||
3219 | close(pipefd[0]); /* Close the read-end of the pipe. */ | |
3220 | ||
3221 | /* Redirect stdout to write-end of the pipe. */ | |
3222 | ret = dup2(pipefd[1], STDOUT_FILENO); | |
3223 | close(pipefd[1]); /* Close the write-end of the pipe. */ | |
3224 | if (ret < 0) { | |
3225 | SYSERROR("Failed to dup2() to redirect stdout to pipe file descriptor."); | |
3226 | exit(EXIT_FAILURE); | |
3227 | } | |
a7242d9a | 3228 | |
091045f8 | 3229 | if (netdev->link) |
cff7b5eb | 3230 | strncpy(netdev_link, netdev->link, IFNAMSIZ); |
091045f8 | 3231 | else |
cff7b5eb | 3232 | strncpy(netdev_link, "none", IFNAMSIZ); |
091045f8 CB |
3233 | |
3234 | ret = snprintf(pidstr, LXC_NUMSTRLEN64, "%d", pid); | |
3235 | if (ret < 0 || ret >= LXC_NUMSTRLEN64) | |
3236 | exit(EXIT_FAILURE); | |
3237 | pidstr[LXC_NUMSTRLEN64 - 1] = '\0'; | |
3238 | ||
3239 | INFO("Execing lxc-user-nic %s %s %s veth %s %s", lxcpath, | |
3240 | lxcname, pidstr, netdev_link, netdev->name); | |
c43cbc04 | 3241 | execlp(LXC_USERNIC_PATH, LXC_USERNIC_PATH, lxcpath, lxcname, |
091045f8 CB |
3242 | pidstr, "veth", netdev_link, netdev->name, NULL); |
3243 | ||
3244 | SYSERROR("Failed to exec lxc-user-nic."); | |
3245 | exit(EXIT_FAILURE); | |
a7242d9a ÇO |
3246 | } |
3247 | ||
3248 | /* close the write-end of the pipe */ | |
3249 | close(pipefd[1]); | |
3250 | ||
fe1f672f | 3251 | bytes = read(pipefd[0], &buffer, MAX_BUFFER_SIZE); |
091045f8 CB |
3252 | if (bytes < 0) |
3253 | SYSERROR("Failed to read from pipe file descriptor."); | |
a7242d9a ÇO |
3254 | buffer[bytes - 1] = '\0'; |
3255 | ||
3256 | if (wait_for_pid(child) != 0) { | |
3257 | close(pipefd[0]); | |
cbef6c52 SH |
3258 | return -1; |
3259 | } | |
3260 | ||
a7242d9a ÇO |
3261 | /* close the read-end of the pipe */ |
3262 | close(pipefd[0]); | |
cbef6c52 | 3263 | |
a7242d9a ÇO |
3264 | /* fill netdev->name field */ |
3265 | token = strtok_r(buffer, ":", &saveptr); | |
3266 | if (!token) | |
3267 | return -1; | |
091045f8 CB |
3268 | |
3269 | netdev->name = malloc(IFNAMSIZ + 1); | |
658979c5 | 3270 | if (!netdev->name) { |
091045f8 | 3271 | SYSERROR("Failed to allocate memory."); |
658979c5 SH |
3272 | return -1; |
3273 | } | |
091045f8 | 3274 | memset(netdev->name, 0, IFNAMSIZ + 1); |
658979c5 | 3275 | strncpy(netdev->name, token, IFNAMSIZ); |
a7242d9a ÇO |
3276 | |
3277 | /* fill netdev->veth_attr.pair field */ | |
3278 | token = strtok_r(NULL, ":", &saveptr); | |
3279 | if (!token) | |
3280 | return -1; | |
091045f8 | 3281 | |
a7242d9a | 3282 | netdev->priv.veth_attr.pair = strdup(token); |
658979c5 | 3283 | if (!netdev->priv.veth_attr.pair) { |
091045f8 | 3284 | ERROR("Failed to allocate memory."); |
658979c5 SH |
3285 | return -1; |
3286 | } | |
45e854dc | 3287 | |
a7242d9a | 3288 | return 0; |
cbef6c52 SH |
3289 | } |
3290 | ||
c43cbc04 SH |
3291 | int lxc_assign_network(const char *lxcpath, char *lxcname, |
3292 | struct lxc_list *network, pid_t pid) | |
0ad19a3f | 3293 | { |
82d5ae15 | 3294 | struct lxc_list *iterator; |
82d5ae15 | 3295 | struct lxc_netdev *netdev; |
f2e206ff | 3296 | char ifname[IFNAMSIZ]; |
cbef6c52 | 3297 | int am_root = (getuid() == 0); |
3cfc0f3a | 3298 | int err; |
0ad19a3f | 3299 | |
5f4535a3 | 3300 | lxc_list_for_each(iterator, network) { |
82d5ae15 | 3301 | |
5f4535a3 | 3302 | netdev = iterator->elem; |
82d5ae15 | 3303 | |
fbb16259 | 3304 | if (netdev->type == LXC_NET_VETH && !am_root) { |
72ccbbe1 SC |
3305 | if (netdev->mtu) |
3306 | INFO("mtu ignored due to insufficient privilege"); | |
c43cbc04 | 3307 | if (unpriv_assign_nic(lxcpath, lxcname, netdev, pid)) |
cbef6c52 | 3308 | return -1; |
e337179a CB |
3309 | /* lxc-user-nic has moved the nic to the new ns. |
3310 | * unpriv_assign_nic() fills in netdev->name. | |
3311 | * netdev->ifindex will be filed in at | |
3312 | * lxc_setup_netdev_in_child_namespaces. | |
3313 | */ | |
cbef6c52 SH |
3314 | continue; |
3315 | } | |
236087a6 | 3316 | |
fbb16259 SH |
3317 | /* empty network namespace, nothing to move */ |
3318 | if (!netdev->ifindex) | |
3319 | continue; | |
3320 | ||
f2e206ff | 3321 | /* retrieve the name of the interface */ |
3322 | if (!if_indextoname(netdev->ifindex, ifname)) { | |
3323 | ERROR("no interface corresponding to index '%d'", netdev->ifindex); | |
3324 | return -1; | |
3325 | } | |
3326 | ||
3327 | err = lxc_netdev_move_by_name(ifname, pid, NULL); | |
3cfc0f3a MN |
3328 | if (err) { |
3329 | ERROR("failed to move '%s' to the container : %s", | |
3330 | netdev->link, strerror(-err)); | |
82d5ae15 DL |
3331 | return -1; |
3332 | } | |
3333 | ||
198cbbaa | 3334 | DEBUG("move '%s'/'%s' to '%d': .", ifname, netdev->name, pid); |
0ad19a3f | 3335 | } |
3336 | ||
3337 | return 0; | |
3338 | } | |
3339 | ||
251d0d2a DE |
3340 | static int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
3341 | size_t buf_size) | |
f6d3e3e4 | 3342 | { |
29053180 CB |
3343 | char path[MAXPATHLEN]; |
3344 | int fd, ret; | |
f6d3e3e4 | 3345 | |
29053180 CB |
3346 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/%cid_map", pid, |
3347 | idtype == ID_TYPE_UID ? 'u' : 'g'); | |
3348 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3349 | ERROR("failed to create path \"%s\"", path); | |
f6d3e3e4 SH |
3350 | return -E2BIG; |
3351 | } | |
29053180 CB |
3352 | |
3353 | fd = open(path, O_WRONLY); | |
3354 | if (fd < 0) { | |
3355 | SYSERROR("failed to open \"%s\"", path); | |
3356 | return -1; | |
f6d3e3e4 | 3357 | } |
29053180 CB |
3358 | |
3359 | errno = 0; | |
3360 | ret = lxc_write_nointr(fd, buf, buf_size); | |
3361 | if (ret != buf_size) { | |
3362 | SYSERROR("failed to write %cid mapping to \"%s\"", | |
3363 | idtype == ID_TYPE_UID ? 'u' : 'g', path); | |
3364 | close(fd); | |
3365 | return -1; | |
3366 | } | |
3367 | close(fd); | |
3368 | ||
3369 | return 0; | |
f6d3e3e4 SH |
3370 | } |
3371 | ||
6e50e704 CB |
3372 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
3373 | * | |
3374 | * @return 1 if functional binary was found | |
3375 | * @return 0 if binary exists but is lacking privilege | |
3376 | * @return -ENOENT if binary does not exist | |
3377 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
3378 | * | |
3379 | */ | |
df6a2945 CB |
3380 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
3381 | { | |
3382 | char *path; | |
3383 | int ret; | |
3384 | struct stat st; | |
3385 | int fret = 0; | |
3386 | ||
6e50e704 CB |
3387 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
3388 | return -EINVAL; | |
3389 | ||
df6a2945 CB |
3390 | path = on_path(binary, NULL); |
3391 | if (!path) | |
3392 | return -ENOENT; | |
3393 | ||
3394 | ret = stat(path, &st); | |
3395 | if (ret < 0) { | |
3396 | fret = -errno; | |
3397 | goto cleanup; | |
3398 | } | |
3399 | ||
3400 | /* Check if the binary is setuid. */ | |
3401 | if (st.st_mode & S_ISUID) { | |
3402 | DEBUG("The binary \"%s\" does have the setuid bit set.", path); | |
3403 | fret = 1; | |
3404 | goto cleanup; | |
3405 | } | |
3406 | ||
69924fff | 3407 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
3408 | /* Check if it has the CAP_SETUID capability. */ |
3409 | if ((cap & CAP_SETUID) && | |
3410 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
3411 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) { | |
3412 | DEBUG("The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE " | |
3413 | "and CAP_PERMITTED sets.", path); | |
3414 | fret = 1; | |
3415 | goto cleanup; | |
3416 | } | |
3417 | ||
3418 | /* Check if it has the CAP_SETGID capability. */ | |
3419 | if ((cap & CAP_SETGID) && | |
3420 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
3421 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) { | |
3422 | DEBUG("The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE " | |
3423 | "and CAP_PERMITTED sets.", path); | |
3424 | fret = 1; | |
3425 | goto cleanup; | |
3426 | } | |
d6018f88 | 3427 | #else |
69924fff CB |
3428 | /* If we cannot check for file capabilities we need to give the benefit |
3429 | * of the doubt. Otherwise we might fail even though all the necessary | |
3430 | * file capabilities are set. | |
3431 | */ | |
d6018f88 CB |
3432 | DEBUG("Cannot check for file capabilites as full capability support is " |
3433 | "missing. Manual intervention needed."); | |
3434 | fret = 1; | |
df6a2945 CB |
3435 | #endif |
3436 | ||
3437 | cleanup: | |
3438 | free(path); | |
3439 | return fret; | |
3440 | } | |
3441 | ||
986ef930 CB |
3442 | int lxc_map_ids_exec_wrapper(void *args) |
3443 | { | |
3444 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
3445 | return -1; | |
3446 | } | |
3447 | ||
f6d3e3e4 SH |
3448 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) |
3449 | { | |
f6d3e3e4 | 3450 | struct id_map *map; |
4bc3b759 | 3451 | struct lxc_list *iterator; |
251d0d2a | 3452 | enum idtype type; |
986ef930 | 3453 | char u_or_g; |
4bc3b759 | 3454 | char *pos; |
99d43365 | 3455 | int fill, left; |
986ef930 CB |
3456 | char cmd_output[MAXPATHLEN]; |
3457 | /* strlen("new@idmap") = 9 | |
3458 | * + | |
3459 | * strlen(" ") = 1 | |
3460 | * + | |
3461 | * LXC_NUMSTRLEN64 | |
3462 | * + | |
3463 | * strlen(" ") = 1 | |
3464 | * | |
3465 | * We add some additional space to make sure that we really have | |
3466 | * LXC_IDMAPLEN bytes available for our the {g,u]id mapping. | |
3467 | */ | |
3468 | char mapbuf[9 + 1 + LXC_NUMSTRLEN64 + 1 + LXC_IDMAPLEN] = {0}; | |
3469 | int ret = 0, uidmap = 0, gidmap = 0; | |
3470 | bool use_shadow = false, had_entry = false; | |
df6a2945 CB |
3471 | |
3472 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid | |
3473 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
3474 | * will protected it by preventing another user from being handed the |
3475 | * range by shadow. | |
3476 | */ | |
df6a2945 | 3477 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
3478 | if (uidmap == -ENOENT) |
3479 | WARN("newuidmap binary is missing"); | |
3480 | else if (!uidmap) | |
3481 | WARN("newuidmap is lacking necessary privileges"); | |
3482 | ||
df6a2945 | 3483 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
3484 | if (gidmap == -ENOENT) |
3485 | WARN("newgidmap binary is missing"); | |
3486 | else if (!gidmap) | |
3487 | WARN("newgidmap is lacking necessary privileges"); | |
3488 | ||
df6a2945 CB |
3489 | if (uidmap > 0 && gidmap > 0) { |
3490 | DEBUG("Functional newuidmap and newgidmap binary found."); | |
4bc3b759 | 3491 | use_shadow = true; |
df6a2945 | 3492 | } else { |
99d43365 CB |
3493 | /* In case unprivileged users run application containers via |
3494 | * execute() or a start*() there are valid cases where they may | |
3495 | * only want to map their own {g,u}id. Let's not block them from | |
3496 | * doing so by requiring geteuid() == 0. | |
3497 | */ | |
3498 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
3499 | "write directly with euid %d.", geteuid()); | |
0e6e3a41 | 3500 | } |
251d0d2a | 3501 | |
986ef930 CB |
3502 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
3503 | type++, u_or_g = 'g') { | |
3504 | pos = mapbuf; | |
3505 | ||
0e6e3a41 | 3506 | if (use_shadow) |
986ef930 | 3507 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 3508 | |
cf3ef16d | 3509 | lxc_list_for_each(iterator, idmap) { |
4bc3b759 CB |
3510 | /* The kernel only takes <= 4k for writes to |
3511 | * /proc/<nr>/[ug]id_map | |
3512 | */ | |
251d0d2a | 3513 | map = iterator->elem; |
cf3ef16d SH |
3514 | if (map->idtype != type) |
3515 | continue; | |
3516 | ||
4bc3b759 CB |
3517 | had_entry = true; |
3518 | ||
986ef930 | 3519 | left = LXC_IDMAPLEN - (pos - mapbuf); |
d1838f34 | 3520 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
3521 | use_shadow ? " " : "", map->nsid, |
3522 | map->hostid, map->range, | |
0e6e3a41 | 3523 | use_shadow ? "" : "\n"); |
cf3ef16d | 3524 | if (fill <= 0 || fill >= left) |
4bc3b759 CB |
3525 | SYSERROR("Too many {g,u}id mappings defined."); |
3526 | ||
cf3ef16d | 3527 | pos += fill; |
251d0d2a | 3528 | } |
cf3ef16d | 3529 | if (!had_entry) |
4f7521b4 | 3530 | continue; |
cf3ef16d | 3531 | |
986ef930 CB |
3532 | /* Try to catch the ouput of new{g,u}idmap to make debugging |
3533 | * easier. | |
3534 | */ | |
3535 | if (use_shadow) { | |
3536 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3537 | lxc_map_ids_exec_wrapper, | |
3538 | (void *)mapbuf); | |
3539 | if (ret < 0) { | |
3540 | ERROR("new%cidmap failed to write mapping: %s", | |
3541 | u_or_g, cmd_output); | |
3542 | return -1; | |
3543 | } | |
d1838f34 | 3544 | } else { |
986ef930 CB |
3545 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
3546 | if (ret < 0) | |
3547 | return -1; | |
d1838f34 | 3548 | } |
986ef930 CB |
3549 | |
3550 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 3551 | } |
251d0d2a | 3552 | |
986ef930 | 3553 | return 0; |
f6d3e3e4 SH |
3554 | } |
3555 | ||
cf3ef16d | 3556 | /* |
7b50c609 TS |
3557 | * return the host uid/gid to which the container root is mapped in |
3558 | * *val. | |
0b3a6504 | 3559 | * Return true if id was found, false otherwise. |
cf3ef16d | 3560 | */ |
2a9a80cb | 3561 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
3ec1648d | 3562 | unsigned long *val) |
cf3ef16d SH |
3563 | { |
3564 | struct lxc_list *it; | |
3565 | struct id_map *map; | |
3566 | ||
3567 | lxc_list_for_each(it, &conf->id_map) { | |
3568 | map = it->elem; | |
7b50c609 | 3569 | if (map->idtype != idtype) |
cf3ef16d SH |
3570 | continue; |
3571 | if (map->nsid != 0) | |
3572 | continue; | |
2a9a80cb SH |
3573 | *val = map->hostid; |
3574 | return true; | |
cf3ef16d | 3575 | } |
2a9a80cb | 3576 | return false; |
cf3ef16d SH |
3577 | } |
3578 | ||
2133f58c | 3579 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d SH |
3580 | { |
3581 | struct lxc_list *it; | |
3582 | struct id_map *map; | |
3583 | lxc_list_for_each(it, &conf->id_map) { | |
3584 | map = it->elem; | |
2133f58c | 3585 | if (map->idtype != idtype) |
cf3ef16d SH |
3586 | continue; |
3587 | if (id >= map->hostid && id < map->hostid + map->range) | |
57d116ab | 3588 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 3589 | } |
57d116ab | 3590 | return -1; |
cf3ef16d SH |
3591 | } |
3592 | ||
339efad9 | 3593 | int find_unmapped_nsid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d SH |
3594 | { |
3595 | struct lxc_list *it; | |
3596 | struct id_map *map; | |
2133f58c | 3597 | unsigned int freeid = 0; |
cf3ef16d SH |
3598 | again: |
3599 | lxc_list_for_each(it, &conf->id_map) { | |
3600 | map = it->elem; | |
2133f58c | 3601 | if (map->idtype != idtype) |
cf3ef16d SH |
3602 | continue; |
3603 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { | |
3604 | freeid = map->nsid + map->range; | |
3605 | goto again; | |
3606 | } | |
3607 | } | |
3608 | return freeid; | |
3609 | } | |
3610 | ||
19a26f82 MK |
3611 | int lxc_find_gateway_addresses(struct lxc_handler *handler) |
3612 | { | |
3613 | struct lxc_list *network = &handler->conf->network; | |
3614 | struct lxc_list *iterator; | |
3615 | struct lxc_netdev *netdev; | |
3616 | int link_index; | |
3617 | ||
3618 | lxc_list_for_each(iterator, network) { | |
3619 | netdev = iterator->elem; | |
3620 | ||
3621 | if (!netdev->ipv4_gateway_auto && !netdev->ipv6_gateway_auto) | |
3622 | continue; | |
3623 | ||
3624 | if (netdev->type != LXC_NET_VETH && netdev->type != LXC_NET_MACVLAN) { | |
3625 | ERROR("gateway = auto only supported for " | |
3626 | "veth and macvlan"); | |
3627 | return -1; | |
3628 | } | |
3629 | ||
3630 | if (!netdev->link) { | |
3631 | ERROR("gateway = auto needs a link interface"); | |
3632 | return -1; | |
3633 | } | |
3634 | ||
3635 | link_index = if_nametoindex(netdev->link); | |
3636 | if (!link_index) | |
3637 | return -EINVAL; | |
3638 | ||
3639 | if (netdev->ipv4_gateway_auto) { | |
3640 | if (lxc_ipv4_addr_get(link_index, &netdev->ipv4_gateway)) { | |
3641 | ERROR("failed to automatically find ipv4 gateway " | |
3642 | "address from link interface '%s'", netdev->link); | |
3643 | return -1; | |
3644 | } | |
3645 | } | |
3646 | ||
3647 | if (netdev->ipv6_gateway_auto) { | |
3648 | if (lxc_ipv6_addr_get(link_index, &netdev->ipv6_gateway)) { | |
3649 | ERROR("failed to automatically find ipv6 gateway " | |
3650 | "address from link interface '%s'", netdev->link); | |
3651 | return -1; | |
3652 | } | |
3653 | } | |
3654 | } | |
3655 | ||
3656 | return 0; | |
3657 | } | |
3658 | ||
5e4a62bf | 3659 | int lxc_create_tty(const char *name, struct lxc_conf *conf) |
b0a33c1e | 3660 | { |
5e4a62bf | 3661 | struct lxc_tty_info *tty_info = &conf->tty_info; |
025ed0f3 | 3662 | int i, ret; |
b0a33c1e | 3663 | |
5e4a62bf DL |
3664 | /* no tty in the configuration */ |
3665 | if (!conf->tty) | |
b0a33c1e | 3666 | return 0; |
3667 | ||
9e1045e3 | 3668 | tty_info->pty_info = malloc(sizeof(*tty_info->pty_info) * conf->tty); |
b0a33c1e | 3669 | if (!tty_info->pty_info) { |
9e1045e3 CB |
3670 | SYSERROR("failed to allocate struct *pty_info"); |
3671 | return -ENOMEM; | |
b0a33c1e | 3672 | } |
3673 | ||
985d15b1 | 3674 | for (i = 0; i < conf->tty; i++) { |
b0a33c1e | 3675 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; |
3676 | ||
025ed0f3 SH |
3677 | process_lock(); |
3678 | ret = openpty(&pty_info->master, &pty_info->slave, | |
9e1045e3 | 3679 | pty_info->name, NULL, NULL); |
025ed0f3 SH |
3680 | process_unlock(); |
3681 | if (ret) { | |
9e1045e3 | 3682 | SYSERROR("failed to create pty device number %d", i); |
985d15b1 MT |
3683 | tty_info->nbtty = i; |
3684 | lxc_delete_tty(tty_info); | |
9e1045e3 | 3685 | return -ENOTTY; |
b0a33c1e | 3686 | } |
3687 | ||
9e1045e3 | 3688 | DEBUG("allocated pty \"%s\" with master fd %d and slave fd %d", |
5332bb84 DL |
3689 | pty_info->name, pty_info->master, pty_info->slave); |
3690 | ||
3ec1648d | 3691 | /* Prevent leaking the file descriptors to the container */ |
9e1045e3 CB |
3692 | ret = fcntl(pty_info->master, F_SETFD, FD_CLOEXEC); |
3693 | if (ret < 0) | |
3694 | WARN("failed to set FD_CLOEXEC flag on master fd %d of " | |
3695 | "pty device \"%s\": %s", | |
3696 | pty_info->master, pty_info->name, strerror(errno)); | |
3697 | ||
3698 | ret = fcntl(pty_info->slave, F_SETFD, FD_CLOEXEC); | |
3699 | if (ret < 0) | |
3700 | WARN("failed to set FD_CLOEXEC flag on slave fd %d of " | |
3701 | "pty device \"%s\": %s", | |
3702 | pty_info->slave, pty_info->name, strerror(errno)); | |
b035ad62 | 3703 | |
b0a33c1e | 3704 | pty_info->busy = 0; |
3705 | } | |
3706 | ||
985d15b1 | 3707 | tty_info->nbtty = conf->tty; |
1ac470c0 | 3708 | |
9e1045e3 | 3709 | INFO("finished allocating %d pts devices", conf->tty); |
985d15b1 | 3710 | return 0; |
b0a33c1e | 3711 | } |
3712 | ||
3713 | void lxc_delete_tty(struct lxc_tty_info *tty_info) | |
3714 | { | |
3715 | int i; | |
3716 | ||
3717 | for (i = 0; i < tty_info->nbtty; i++) { | |
3718 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
3719 | ||
3720 | close(pty_info->master); | |
3721 | close(pty_info->slave); | |
3722 | } | |
3723 | ||
3724 | free(tty_info->pty_info); | |
e00c0242 | 3725 | tty_info->pty_info = NULL; |
b0a33c1e | 3726 | tty_info->nbtty = 0; |
3727 | } | |
3728 | ||
f4f52cb5 CB |
3729 | |
3730 | int chown_mapped_root_exec_wrapper(void *args) | |
3731 | { | |
3732 | execvp("lxc-usernsexec", args); | |
3733 | return -1; | |
3734 | } | |
3735 | ||
f6d3e3e4 | 3736 | /* |
7b50c609 TS |
3737 | * chown_mapped_root: for an unprivileged user with uid/gid X to |
3738 | * chown a dir to subuid/subgid Y, he needs to run chown as root | |
3739 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
3740 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
3741 | * root is privileged with respect to hostuid/hostgid X, allowing | |
3742 | * him to do the chown. | |
f6d3e3e4 | 3743 | */ |
c4d10a05 | 3744 | int chown_mapped_root(char *path, struct lxc_conf *conf) |
f6d3e3e4 | 3745 | { |
f4f52cb5 | 3746 | uid_t rootuid, rootgid; |
2a9a80cb | 3747 | unsigned long val; |
a7ef8753 | 3748 | char *chownpath = path; |
f4f52cb5 CB |
3749 | int hostuid, hostgid, ret; |
3750 | struct stat sb; | |
3751 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
3752 | char ugid[100]; | |
3753 | char *args1[] = {"lxc-usernsexec", | |
3754 | "-m", map1, | |
3755 | "-m", map2, | |
3756 | "-m", map3, | |
3757 | "-m", map5, | |
3758 | "--", "chown", ugid, path, | |
3759 | NULL}; | |
3760 | char *args2[] = {"lxc-usernsexec", | |
3761 | "-m", map1, | |
3762 | "-m", map2, | |
3763 | "-m", map3, | |
3764 | "-m", map4, | |
3765 | "-m", map5, | |
3766 | "--", "chown", ugid, path, | |
3767 | NULL}; | |
3768 | char cmd_output[MAXPATHLEN]; | |
3769 | ||
3770 | hostuid = geteuid(); | |
3771 | hostgid = getegid(); | |
f6d3e3e4 | 3772 | |
2a9a80cb | 3773 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
bc80f098 | 3774 | ERROR("No uid mapping for container root"); |
c4d10a05 | 3775 | return -1; |
f6d3e3e4 | 3776 | } |
f4f52cb5 | 3777 | rootuid = (uid_t)val; |
7b50c609 | 3778 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { |
bc80f098 | 3779 | ERROR("No gid mapping for container root"); |
7b50c609 TS |
3780 | return -1; |
3781 | } | |
f4f52cb5 | 3782 | rootgid = (gid_t)val; |
2a9a80cb | 3783 | |
a7ef8753 | 3784 | /* |
f4f52cb5 | 3785 | * In case of overlay, we want only the writeable layer to be chowned |
a7ef8753 | 3786 | */ |
1f92162d | 3787 | if (strncmp(path, "overlayfs:", 10) == 0 || strncmp(path, "aufs:", 5) == 0) { |
a7ef8753 SH |
3788 | chownpath = strchr(path, ':'); |
3789 | if (!chownpath) { | |
3790 | ERROR("Bad overlay path: %s", path); | |
3791 | return -1; | |
3792 | } | |
f4f52cb5 | 3793 | chownpath = strchr(chownpath + 1, ':'); |
a7ef8753 SH |
3794 | if (!chownpath) { |
3795 | ERROR("Bad overlay path: %s", path); | |
3796 | return -1; | |
3797 | } | |
3798 | chownpath++; | |
3799 | } | |
3800 | path = chownpath; | |
f4f52cb5 | 3801 | if (hostuid == 0) { |
7b50c609 | 3802 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3803 | ERROR("Error chowning %s", path); |
3804 | return -1; | |
3805 | } | |
3806 | return 0; | |
3807 | } | |
f3d7e4ca | 3808 | |
f4f52cb5 | 3809 | if (rootuid == hostuid) { |
f3d7e4ca | 3810 | // nothing to do |
b103ceac | 3811 | INFO("Container root is our uid; no need to chown"); |
f3d7e4ca SH |
3812 | return 0; |
3813 | } | |
3814 | ||
bbdbf8f0 | 3815 | /* save the current gid of "path" */ |
f4f52cb5 CB |
3816 | if (stat(path, &sb) < 0) { |
3817 | ERROR("Error stat %s", path); | |
f6d3e3e4 SH |
3818 | return -1; |
3819 | } | |
7b50c609 | 3820 | |
bbdbf8f0 CB |
3821 | /* Update the path argument in case this was overlayfs. */ |
3822 | args1[sizeof(args1) / sizeof(args1[0]) - 2] = path; | |
3823 | args2[sizeof(args2) / sizeof(args2[0]) - 2] = path; | |
3824 | ||
f4f52cb5 CB |
3825 | /* |
3826 | * A file has to be group-owned by a gid mapped into the | |
3827 | * container, or the container won't be privileged over it. | |
3828 | */ | |
3829 | DEBUG("trying to chown \"%s\" to %d", path, hostgid); | |
3830 | if (sb.st_uid == hostuid && | |
3831 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3832 | chown(path, -1, hostgid) < 0) { | |
3833 | ERROR("Failed chgrping %s", path); | |
3834 | return -1; | |
3835 | } | |
f6d3e3e4 | 3836 | |
f4f52cb5 CB |
3837 | // "u:0:rootuid:1" |
3838 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); | |
3839 | if (ret < 0 || ret >= 100) { | |
3840 | ERROR("Error uid printing map string"); | |
3841 | return -1; | |
3842 | } | |
7b50c609 | 3843 | |
f4f52cb5 CB |
3844 | // "u:hostuid:hostuid:1" |
3845 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); | |
3846 | if (ret < 0 || ret >= 100) { | |
3847 | ERROR("Error uid printing map string"); | |
3848 | return -1; | |
3849 | } | |
c4d10a05 | 3850 | |
f4f52cb5 CB |
3851 | // "g:0:rootgid:1" |
3852 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); | |
3853 | if (ret < 0 || ret >= 100) { | |
3854 | ERROR("Error gid printing map string"); | |
3855 | return -1; | |
3856 | } | |
98e5ba51 | 3857 | |
f4f52cb5 CB |
3858 | // "g:pathgid:rootgid+pathgid:1" |
3859 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, | |
3860 | rootgid + (gid_t)sb.st_gid); | |
3861 | if (ret < 0 || ret >= 100) { | |
3862 | ERROR("Error gid printing map string"); | |
3863 | return -1; | |
3864 | } | |
c4d10a05 | 3865 | |
f4f52cb5 CB |
3866 | // "g:hostgid:hostgid:1" |
3867 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); | |
3868 | if (ret < 0 || ret >= 100) { | |
3869 | ERROR("Error gid printing map string"); | |
3870 | return -1; | |
3871 | } | |
7b50c609 | 3872 | |
f4f52cb5 CB |
3873 | // "0:pathgid" (chown) |
3874 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); | |
3875 | if (ret < 0 || ret >= 100) { | |
3876 | ERROR("Error owner printing format string for chown"); | |
3877 | return -1; | |
3878 | } | |
7b50c609 | 3879 | |
f4f52cb5 CB |
3880 | if (hostgid == sb.st_gid) |
3881 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3882 | chown_mapped_root_exec_wrapper, | |
3883 | (void *)args1); | |
3884 | else | |
3885 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3886 | chown_mapped_root_exec_wrapper, | |
3887 | (void *)args2); | |
3888 | if (ret < 0) | |
3889 | ERROR("lxc-usernsexec failed: %s", cmd_output); | |
7b50c609 | 3890 | |
f4f52cb5 | 3891 | return ret; |
f6d3e3e4 SH |
3892 | } |
3893 | ||
54117de5 | 3894 | int lxc_ttys_shift_ids(struct lxc_conf *c) |
f6d3e3e4 | 3895 | { |
c4d10a05 | 3896 | if (lxc_list_empty(&c->id_map)) |
f6d3e3e4 | 3897 | return 0; |
c4d10a05 | 3898 | |
54117de5 CB |
3899 | if (!strcmp(c->console.name, "")) |
3900 | return 0; | |
3901 | ||
3902 | if (chown_mapped_root(c->console.name, c) < 0) { | |
3903 | ERROR("failed to chown console \"%s\"", c->console.name); | |
c4d10a05 SH |
3904 | return -1; |
3905 | } | |
3906 | ||
54117de5 CB |
3907 | TRACE("chowned console \"%s\"", c->console.name); |
3908 | ||
f6d3e3e4 SH |
3909 | return 0; |
3910 | } | |
3911 | ||
943144d9 CB |
3912 | /* NOTE: Must not be called from inside the container namespace! */ |
3913 | int lxc_create_tmp_proc_mount(struct lxc_conf *conf) | |
5112cd70 SH |
3914 | { |
3915 | int mounted; | |
3916 | ||
943144d9 | 3917 | mounted = lxc_mount_proc_if_needed(conf->rootfs.path ? conf->rootfs.mount : ""); |
5112cd70 | 3918 | if (mounted == -1) { |
943144d9 | 3919 | SYSERROR("failed to mount /proc in the container"); |
01958b1f | 3920 | /* continue only if there is no rootfs */ |
943144d9 | 3921 | if (conf->rootfs.path) |
01958b1f | 3922 | return -1; |
5112cd70 | 3923 | } else if (mounted == 1) { |
943144d9 | 3924 | conf->tmp_umount_proc = 1; |
5112cd70 | 3925 | } |
943144d9 | 3926 | |
5112cd70 SH |
3927 | return 0; |
3928 | } | |
3929 | ||
3930 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3931 | { | |
3932 | if (lxc_conf->tmp_umount_proc == 1) { | |
3933 | umount("/proc"); | |
3934 | lxc_conf->tmp_umount_proc = 0; | |
3935 | } | |
3936 | } | |
3937 | ||
6a0c909a | 3938 | void remount_all_slave(void) |
e995d7a2 SH |
3939 | { |
3940 | /* walk /proc/mounts and change any shared entries to slave */ | |
3941 | FILE *f = fopen("/proc/self/mountinfo", "r"); | |
3942 | char *line = NULL; | |
3943 | size_t len = 0; | |
3944 | ||
3945 | if (!f) { | |
3946 | SYSERROR("Failed to open /proc/self/mountinfo to mark all shared"); | |
3947 | ERROR("Continuing container startup..."); | |
3948 | return; | |
3949 | } | |
3950 | ||
3951 | while (getline(&line, &len, f) != -1) { | |
3952 | char *target, *opts; | |
3953 | target = get_field(line, 4); | |
3954 | if (!target) | |
3955 | continue; | |
3956 | opts = get_field(target, 2); | |
3957 | if (!opts) | |
3958 | continue; | |
3959 | null_endofword(opts); | |
3960 | if (!strstr(opts, "shared")) | |
3961 | continue; | |
3962 | null_endofword(target); | |
3963 | if (mount(NULL, target, NULL, MS_SLAVE, NULL)) { | |
3964 | SYSERROR("Failed to make %s rslave", target); | |
3965 | ERROR("Continuing..."); | |
3966 | } | |
3967 | } | |
3968 | fclose(f); | |
f10fad2f | 3969 | free(line); |
e995d7a2 SH |
3970 | } |
3971 | ||
2322903b SH |
3972 | void lxc_execute_bind_init(struct lxc_conf *conf) |
3973 | { | |
3974 | int ret; | |
9d9c111c SH |
3975 | char path[PATH_MAX], destpath[PATH_MAX], *p; |
3976 | ||
3977 | /* If init exists in the container, don't bind mount a static one */ | |
3978 | p = choose_init(conf->rootfs.mount); | |
3979 | if (p) { | |
3980 | free(p); | |
3981 | return; | |
3982 | } | |
2322903b SH |
3983 | |
3984 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
3985 | if (ret < 0 || ret >= PATH_MAX) { | |
3986 | WARN("Path name too long searching for lxc.init.static"); | |
3987 | return; | |
3988 | } | |
3989 | ||
3990 | if (!file_exists(path)) { | |
3991 | INFO("%s does not exist on host", path); | |
3992 | return; | |
3993 | } | |
3994 | ||
3995 | ret = snprintf(destpath, PATH_MAX, "%s%s", conf->rootfs.mount, "/init.lxc.static"); | |
3996 | if (ret < 0 || ret >= PATH_MAX) { | |
3997 | WARN("Path name too long for container's lxc.init.static"); | |
3998 | return; | |
3999 | } | |
4000 | ||
4001 | if (!file_exists(destpath)) { | |
4002 | FILE * pathfile = fopen(destpath, "wb"); | |
4003 | if (!pathfile) { | |
4004 | SYSERROR("Failed to create mount target '%s'", destpath); | |
4005 | return; | |
4006 | } | |
4007 | fclose(pathfile); | |
4008 | } | |
4009 | ||
592fd47a | 4010 | ret = safe_mount(path, destpath, "none", MS_BIND, NULL, conf->rootfs.mount); |
2322903b SH |
4011 | if (ret < 0) |
4012 | SYSERROR("Failed to bind lxc.init.static into container"); | |
4013 | INFO("lxc.init.static bound into container at %s", path); | |
4014 | } | |
4015 | ||
35120d9c SH |
4016 | /* |
4017 | * This does the work of remounting / if it is shared, calling the | |
4018 | * container pre-mount hooks, and mounting the rootfs. | |
4019 | */ | |
4020 | int do_rootfs_setup(struct lxc_conf *conf, const char *name, const char *lxcpath) | |
0ad19a3f | 4021 | { |
35120d9c SH |
4022 | if (conf->rootfs_setup) { |
4023 | /* | |
4024 | * rootfs was set up in another namespace. bind-mount it | |
4025 | * to give us a mount in our own ns so we can pivot_root to it | |
4026 | */ | |
4027 | const char *path = conf->rootfs.mount; | |
4028 | if (mount(path, path, "rootfs", MS_BIND, NULL) < 0) { | |
4029 | ERROR("Failed to bind-mount container / onto itself"); | |
145832ba | 4030 | return -1; |
35120d9c | 4031 | } |
145832ba | 4032 | return 0; |
35120d9c | 4033 | } |
d4ef7c50 | 4034 | |
e995d7a2 SH |
4035 | remount_all_slave(); |
4036 | ||
35120d9c SH |
4037 | if (run_lxc_hooks(name, "pre-mount", conf, lxcpath, NULL)) { |
4038 | ERROR("failed to run pre-mount hooks for container '%s'.", name); | |
4039 | return -1; | |
4040 | } | |
4041 | ||
9aa76a17 | 4042 | if (lxc_setup_rootfs(conf)) { |
35120d9c SH |
4043 | ERROR("failed to setup rootfs for '%s'", name); |
4044 | return -1; | |
4045 | } | |
4046 | ||
4047 | conf->rootfs_setup = true; | |
4048 | return 0; | |
4049 | } | |
4050 | ||
1c1c7051 SH |
4051 | static bool verify_start_hooks(struct lxc_conf *conf) |
4052 | { | |
4053 | struct lxc_list *it; | |
4054 | char path[MAXPATHLEN]; | |
4055 | lxc_list_for_each(it, &conf->hooks[LXCHOOK_START]) { | |
4056 | char *hookname = it->elem; | |
4057 | struct stat st; | |
4058 | int ret; | |
4059 | ||
4060 | ret = snprintf(path, MAXPATHLEN, "%s%s", | |
7b6753e7 | 4061 | conf->rootfs.path ? conf->rootfs.mount : "", hookname); |
1c1c7051 SH |
4062 | if (ret < 0 || ret >= MAXPATHLEN) |
4063 | return false; | |
4064 | ret = stat(path, &st); | |
4065 | if (ret) { | |
7b6753e7 | 4066 | SYSERROR("Start hook %s not found in container", |
1c1c7051 SH |
4067 | hookname); |
4068 | return false; | |
4069 | } | |
6a0c909a | 4070 | return true; |
1c1c7051 SH |
4071 | } |
4072 | ||
4073 | return true; | |
4074 | } | |
4075 | ||
ae467c54 | 4076 | static int lxc_send_ttys_to_parent(struct lxc_handler *handler) |
e8bd4e43 | 4077 | { |
ae467c54 CB |
4078 | int i; |
4079 | int *ttyfds; | |
4080 | struct lxc_pty_info *pty_info; | |
e8bd4e43 SH |
4081 | struct lxc_conf *conf = handler->conf; |
4082 | const struct lxc_tty_info *tty_info = &conf->tty_info; | |
e8bd4e43 | 4083 | int sock = handler->ttysock[0]; |
ae467c54 CB |
4084 | int ret = -1; |
4085 | size_t num_ttyfds = (2 * conf->tty); | |
e8bd4e43 | 4086 | |
ae467c54 CB |
4087 | ttyfds = malloc(num_ttyfds * sizeof(int)); |
4088 | if (!ttyfds) | |
4089 | return -1; | |
4090 | ||
4091 | for (i = 0; i < num_ttyfds; i++) { | |
4092 | pty_info = &tty_info->pty_info[i / 2]; | |
4093 | ttyfds[i++] = pty_info->slave; | |
4094 | ttyfds[i] = pty_info->master; | |
4095 | TRACE("send pty \"%s\" with master fd %d and slave fd %d to " | |
f07fa8df CB |
4096 | "parent", |
4097 | pty_info->name, pty_info->master, pty_info->slave); | |
e8bd4e43 SH |
4098 | } |
4099 | ||
ae467c54 CB |
4100 | ret = lxc_abstract_unix_send_fds(sock, ttyfds, num_ttyfds, NULL, 0); |
4101 | if (ret < 0) | |
4102 | ERROR("failed to send %d ttys to parent: %s", conf->tty, | |
4103 | strerror(errno)); | |
4104 | else | |
4105 | TRACE("sent %d ttys to parent", conf->tty); | |
4106 | ||
e8bd4e43 SH |
4107 | close(handler->ttysock[0]); |
4108 | close(handler->ttysock[1]); | |
4109 | ||
ae467c54 CB |
4110 | for (i = 0; i < num_ttyfds; i++) |
4111 | close(ttyfds[i]); | |
e8bd4e43 | 4112 | |
ae467c54 CB |
4113 | free(ttyfds); |
4114 | ||
4115 | return ret; | |
e8bd4e43 SH |
4116 | } |
4117 | ||
35120d9c SH |
4118 | int lxc_setup(struct lxc_handler *handler) |
4119 | { | |
4120 | const char *name = handler->name; | |
4121 | struct lxc_conf *lxc_conf = handler->conf; | |
4122 | const char *lxcpath = handler->lxcpath; | |
35120d9c SH |
4123 | |
4124 | if (do_rootfs_setup(lxc_conf, name, lxcpath) < 0) { | |
4125 | ERROR("Error setting up rootfs mount after spawn"); | |
4126 | return -1; | |
4127 | } | |
4128 | ||
6c544cb3 MM |
4129 | if (lxc_conf->inherit_ns_fd[LXC_NS_UTS] == -1) { |
4130 | if (setup_utsname(lxc_conf->utsname)) { | |
4131 | ERROR("failed to setup the utsname for '%s'", name); | |
4132 | return -1; | |
4133 | } | |
0ad19a3f | 4134 | } |
4135 | ||
e337179a CB |
4136 | if (lxc_setup_networks_in_child_namespaces(lxc_conf, |
4137 | &lxc_conf->network)) { | |
36eb9bde | 4138 | ERROR("failed to setup the network for '%s'", name); |
95b5ffaf | 4139 | return -1; |
0ad19a3f | 4140 | } |
4141 | ||
bc6928ff | 4142 | if (lxc_conf->autodev > 0) { |
14221cbb | 4143 | if (mount_autodev(name, &lxc_conf->rootfs, lxcpath)) { |
91c3830e | 4144 | ERROR("failed to mount /dev in the container"); |
c6883f38 SH |
4145 | return -1; |
4146 | } | |
4147 | } | |
4148 | ||
368bbc02 CS |
4149 | /* do automatic mounts (mainly /proc and /sys), but exclude |
4150 | * those that need to wait until other stuff has finished | |
4151 | */ | |
4fb3cba5 | 4152 | if (lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler) < 0) { |
368bbc02 CS |
4153 | ERROR("failed to setup the automatic mounts for '%s'", name); |
4154 | return -1; | |
4155 | } | |
4156 | ||
0a2dddd4 | 4157 | if (setup_mount(&lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath)) { |
36eb9bde | 4158 | ERROR("failed to setup the mounts for '%s'", name); |
95b5ffaf | 4159 | return -1; |
576f946d | 4160 | } |
4161 | ||
0a2dddd4 | 4162 | if (!lxc_list_empty(&lxc_conf->mount_list) && setup_mount_entries(&lxc_conf->rootfs, &lxc_conf->mount_list, name, lxcpath)) { |
e7938e9e MN |
4163 | ERROR("failed to setup the mount entries for '%s'", name); |
4164 | return -1; | |
4165 | } | |
4166 | ||
7b6753e7 | 4167 | /* Make sure any start hooks are in the container */ |
1c1c7051 SH |
4168 | if (!verify_start_hooks(lxc_conf)) |
4169 | return -1; | |
4170 | ||
2322903b SH |
4171 | if (lxc_conf->is_execute) |
4172 | lxc_execute_bind_init(lxc_conf); | |
4173 | ||
368bbc02 CS |
4174 | /* now mount only cgroup, if wanted; |
4175 | * before, /sys could not have been mounted | |
4176 | * (is either mounted automatically or via fstab entries) | |
4177 | */ | |
4fb3cba5 | 4178 | if (lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler) < 0) { |
368bbc02 CS |
4179 | ERROR("failed to setup the automatic mounts for '%s'", name); |
4180 | return -1; | |
4181 | } | |
4182 | ||
283678ed | 4183 | if (run_lxc_hooks(name, "mount", lxc_conf, lxcpath, NULL)) { |
773fb9ca SH |
4184 | ERROR("failed to run mount hooks for container '%s'.", name); |
4185 | return -1; | |
4186 | } | |
4187 | ||
bc6928ff | 4188 | if (lxc_conf->autodev > 0) { |
283678ed | 4189 | if (run_lxc_hooks(name, "autodev", lxc_conf, lxcpath, NULL)) { |
f7bee6c6 MW |
4190 | ERROR("failed to run autodev hooks for container '%s'.", name); |
4191 | return -1; | |
4192 | } | |
27245ff7 | 4193 | if (lxc_fill_autodev(&lxc_conf->rootfs)) { |
91c3830e SH |
4194 | ERROR("failed to populate /dev in the container"); |
4195 | return -1; | |
4196 | } | |
4197 | } | |
368bbc02 | 4198 | |
3d7d929a | 4199 | if (!lxc_conf->is_execute && lxc_setup_console(&lxc_conf->rootfs, &lxc_conf->console, lxc_conf->ttydir)) { |
36eb9bde | 4200 | ERROR("failed to setup the console for '%s'", name); |
95b5ffaf | 4201 | return -1; |
6e590161 | 4202 | } |
4203 | ||
69aa6655 DE |
4204 | if (!lxc_conf->is_execute && setup_dev_symlinks(&lxc_conf->rootfs)) { |
4205 | ERROR("failed to setup /dev symlinks for '%s'", name); | |
4206 | return -1; | |
4207 | } | |
4208 | ||
5112cd70 | 4209 | /* mount /proc if it's not already there */ |
943144d9 | 4210 | if (lxc_create_tmp_proc_mount(lxc_conf) < 0) { |
fe4de9a6 | 4211 | ERROR("failed to LSM mount proc for '%s'", name); |
e075f5d9 | 4212 | return -1; |
e075f5d9 | 4213 | } |
e075f5d9 | 4214 | |
ac778708 | 4215 | if (setup_pivot_root(&lxc_conf->rootfs)) { |
36eb9bde | 4216 | ERROR("failed to set rootfs for '%s'", name); |
95b5ffaf | 4217 | return -1; |
ed502555 | 4218 | } |
4219 | ||
70761e5e | 4220 | if (lxc_setup_devpts(lxc_conf->pts)) { |
36eb9bde | 4221 | ERROR("failed to setup the new pts instance"); |
95b5ffaf | 4222 | return -1; |
3c26f34e | 4223 | } |
4224 | ||
e8bd4e43 SH |
4225 | if (lxc_create_tty(name, lxc_conf)) { |
4226 | ERROR("failed to create the ttys"); | |
4227 | return -1; | |
4228 | } | |
4229 | ||
ae467c54 | 4230 | if (lxc_send_ttys_to_parent(handler) < 0) { |
e8bd4e43 SH |
4231 | ERROR("failure sending console info to parent"); |
4232 | return -1; | |
4233 | } | |
4234 | ||
9e1045e3 | 4235 | if (!lxc_conf->is_execute && lxc_setup_tty(lxc_conf)) { |
e8bd4e43 SH |
4236 | ERROR("failed to setup the ttys for '%s'", name); |
4237 | return -1; | |
4238 | } | |
4239 | ||
4240 | if (lxc_conf->pty_names && setenv("container_ttys", lxc_conf->pty_names, 1)) | |
4241 | SYSERROR("failed to set environment variable for container ptys"); | |
4242 | ||
4243 | ||
cccc74b5 DL |
4244 | if (setup_personality(lxc_conf->personality)) { |
4245 | ERROR("failed to setup personality"); | |
4246 | return -1; | |
4247 | } | |
4248 | ||
97a8f74f SG |
4249 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
4250 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
7389ca26 | 4251 | ERROR("Container requests lxc.cap.drop and lxc.cap.keep: either use lxc.cap.drop or lxc.cap.keep, not both."); |
f6d3e3e4 SH |
4252 | return -1; |
4253 | } | |
97a8f74f SG |
4254 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
4255 | ERROR("failed to keep requested caps"); | |
4256 | return -1; | |
4257 | } | |
4258 | } else if (setup_caps(&lxc_conf->caps)) { | |
4259 | ERROR("failed to drop capabilities"); | |
4260 | return -1; | |
81810dd1 DL |
4261 | } |
4262 | ||
f4152036 | 4263 | NOTICE("Container \"%s\" is set up", name); |
cd54d859 | 4264 | |
0ad19a3f | 4265 | return 0; |
4266 | } | |
26ddeedd | 4267 | |
283678ed SH |
4268 | int run_lxc_hooks(const char *name, char *hook, struct lxc_conf *conf, |
4269 | const char *lxcpath, char *argv[]) | |
26ddeedd SH |
4270 | { |
4271 | int which = -1; | |
4272 | struct lxc_list *it; | |
4273 | ||
4274 | if (strcmp(hook, "pre-start") == 0) | |
4275 | which = LXCHOOK_PRESTART; | |
5ea6163a SH |
4276 | else if (strcmp(hook, "pre-mount") == 0) |
4277 | which = LXCHOOK_PREMOUNT; | |
26ddeedd SH |
4278 | else if (strcmp(hook, "mount") == 0) |
4279 | which = LXCHOOK_MOUNT; | |
f7bee6c6 MW |
4280 | else if (strcmp(hook, "autodev") == 0) |
4281 | which = LXCHOOK_AUTODEV; | |
26ddeedd SH |
4282 | else if (strcmp(hook, "start") == 0) |
4283 | which = LXCHOOK_START; | |
52492063 WB |
4284 | else if (strcmp(hook, "stop") == 0) |
4285 | which = LXCHOOK_STOP; | |
26ddeedd SH |
4286 | else if (strcmp(hook, "post-stop") == 0) |
4287 | which = LXCHOOK_POSTSTOP; | |
148e91f5 SH |
4288 | else if (strcmp(hook, "clone") == 0) |
4289 | which = LXCHOOK_CLONE; | |
37cf711b SY |
4290 | else if (strcmp(hook, "destroy") == 0) |
4291 | which = LXCHOOK_DESTROY; | |
26ddeedd SH |
4292 | else |
4293 | return -1; | |
4294 | lxc_list_for_each(it, &conf->hooks[which]) { | |
4295 | int ret; | |
4296 | char *hookname = it->elem; | |
283678ed | 4297 | ret = run_script_argv(name, "lxc", hookname, hook, lxcpath, argv); |
26ddeedd SH |
4298 | if (ret) |
4299 | return ret; | |
4300 | } | |
4301 | return 0; | |
4302 | } | |
72d0e1cb | 4303 | |
72d0e1cb SG |
4304 | int lxc_clear_config_caps(struct lxc_conf *c) |
4305 | { | |
9ebb03ad | 4306 | struct lxc_list *it,*next; |
72d0e1cb | 4307 | |
9ebb03ad | 4308 | lxc_list_for_each_safe(it, &c->caps, next) { |
72d0e1cb SG |
4309 | lxc_list_del(it); |
4310 | free(it->elem); | |
4311 | free(it); | |
4312 | } | |
4313 | return 0; | |
4314 | } | |
4315 | ||
74a3920a | 4316 | static int lxc_free_idmap(struct lxc_list *id_map) { |
27c27d73 SH |
4317 | struct lxc_list *it, *next; |
4318 | ||
4355ab5f | 4319 | lxc_list_for_each_safe(it, id_map, next) { |
27c27d73 SH |
4320 | lxc_list_del(it); |
4321 | free(it->elem); | |
4322 | free(it); | |
4323 | } | |
4324 | return 0; | |
4325 | } | |
4326 | ||
4355ab5f SH |
4327 | int lxc_clear_idmaps(struct lxc_conf *c) |
4328 | { | |
4329 | return lxc_free_idmap(&c->id_map); | |
4330 | } | |
4331 | ||
1fb86a7c SH |
4332 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
4333 | { | |
4334 | struct lxc_list *it,*next; | |
4335 | ||
4336 | lxc_list_for_each_safe(it, &c->keepcaps, next) { | |
4337 | lxc_list_del(it); | |
4338 | free(it->elem); | |
4339 | free(it); | |
4340 | } | |
4341 | return 0; | |
4342 | } | |
4343 | ||
12a50cc6 | 4344 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key) |
72d0e1cb | 4345 | { |
9ebb03ad | 4346 | struct lxc_list *it,*next; |
72d0e1cb | 4347 | bool all = false; |
a6390f01 | 4348 | const char *k = NULL; |
72d0e1cb SG |
4349 | |
4350 | if (strcmp(key, "lxc.cgroup") == 0) | |
4351 | all = true; | |
a6390f01 WB |
4352 | else if (strncmp(key, "lxc.cgroup.", sizeof("lxc.cgroup.")-1) == 0) |
4353 | k = key + sizeof("lxc.cgroup.")-1; | |
4354 | else | |
4355 | return -1; | |
72d0e1cb | 4356 | |
9ebb03ad | 4357 | lxc_list_for_each_safe(it, &c->cgroup, next) { |
72d0e1cb SG |
4358 | struct lxc_cgroup *cg = it->elem; |
4359 | if (!all && strcmp(cg->subsystem, k) != 0) | |
4360 | continue; | |
4361 | lxc_list_del(it); | |
4362 | free(cg->subsystem); | |
4363 | free(cg->value); | |
4364 | free(cg); | |
4365 | free(it); | |
4366 | } | |
4367 | return 0; | |
4368 | } | |
4369 | ||
c6d09e15 WB |
4370 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
4371 | { | |
4372 | struct lxc_list *it, *next; | |
4373 | bool all = false; | |
4374 | const char *k = NULL; | |
4375 | ||
240d4b74 | 4376 | if (strcmp(key, "lxc.limit") == 0 |
4377 | || strcmp(key, "lxc.prlimit")) | |
c6d09e15 WB |
4378 | all = true; |
4379 | else if (strncmp(key, "lxc.limit.", sizeof("lxc.limit.")-1) == 0) | |
4380 | k = key + sizeof("lxc.limit.")-1; | |
240d4b74 | 4381 | else if (strncmp(key, "lxc.prlimit.", sizeof("lxc.prlimit.")-1) == 0) |
4382 | k = key + sizeof("lxc.prlimit.")-1; | |
c6d09e15 WB |
4383 | else |
4384 | return -1; | |
4385 | ||
4386 | lxc_list_for_each_safe(it, &c->limits, next) { | |
4387 | struct lxc_limit *lim = it->elem; | |
4388 | if (!all && strcmp(lim->resource, k) != 0) | |
4389 | continue; | |
4390 | lxc_list_del(it); | |
4391 | free(lim->resource); | |
4392 | free(lim); | |
4393 | free(it); | |
4394 | } | |
4395 | return 0; | |
4396 | } | |
4397 | ||
ee1e7aa0 SG |
4398 | int lxc_clear_groups(struct lxc_conf *c) |
4399 | { | |
4400 | struct lxc_list *it,*next; | |
4401 | ||
4402 | lxc_list_for_each_safe(it, &c->groups, next) { | |
4403 | lxc_list_del(it); | |
4404 | free(it->elem); | |
4405 | free(it); | |
4406 | } | |
4407 | return 0; | |
4408 | } | |
4409 | ||
ab799c0b SG |
4410 | int lxc_clear_environment(struct lxc_conf *c) |
4411 | { | |
4412 | struct lxc_list *it,*next; | |
4413 | ||
4414 | lxc_list_for_each_safe(it, &c->environment, next) { | |
4415 | lxc_list_del(it); | |
4416 | free(it->elem); | |
4417 | free(it); | |
4418 | } | |
4419 | return 0; | |
4420 | } | |
4421 | ||
4422 | ||
72d0e1cb SG |
4423 | int lxc_clear_mount_entries(struct lxc_conf *c) |
4424 | { | |
9ebb03ad | 4425 | struct lxc_list *it,*next; |
72d0e1cb | 4426 | |
9ebb03ad | 4427 | lxc_list_for_each_safe(it, &c->mount_list, next) { |
72d0e1cb SG |
4428 | lxc_list_del(it); |
4429 | free(it->elem); | |
4430 | free(it); | |
4431 | } | |
4432 | return 0; | |
4433 | } | |
4434 | ||
b099e9e9 SH |
4435 | int lxc_clear_automounts(struct lxc_conf *c) |
4436 | { | |
4437 | c->auto_mounts = 0; | |
4438 | return 0; | |
4439 | } | |
4440 | ||
12a50cc6 | 4441 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 4442 | { |
9ebb03ad | 4443 | struct lxc_list *it,*next; |
17ed13a3 | 4444 | bool all = false, done = false; |
a6390f01 | 4445 | const char *k = NULL; |
72d0e1cb SG |
4446 | int i; |
4447 | ||
17ed13a3 SH |
4448 | if (strcmp(key, "lxc.hook") == 0) |
4449 | all = true; | |
a6390f01 WB |
4450 | else if (strncmp(key, "lxc.hook.", sizeof("lxc.hook.")-1) == 0) |
4451 | k = key + sizeof("lxc.hook.")-1; | |
4452 | else | |
4453 | return -1; | |
17ed13a3 | 4454 | |
72d0e1cb | 4455 | for (i=0; i<NUM_LXC_HOOKS; i++) { |
17ed13a3 | 4456 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
9ebb03ad | 4457 | lxc_list_for_each_safe(it, &c->hooks[i], next) { |
17ed13a3 SH |
4458 | lxc_list_del(it); |
4459 | free(it->elem); | |
4460 | free(it); | |
4461 | } | |
4462 | done = true; | |
72d0e1cb SG |
4463 | } |
4464 | } | |
17ed13a3 SH |
4465 | |
4466 | if (!done) { | |
4467 | ERROR("Invalid hook key: %s", key); | |
4468 | return -1; | |
4469 | } | |
72d0e1cb SG |
4470 | return 0; |
4471 | } | |
8eb5694b | 4472 | |
74a3920a | 4473 | static void lxc_clear_saved_nics(struct lxc_conf *conf) |
7b35f3d6 SH |
4474 | { |
4475 | int i; | |
4476 | ||
0cf45501 | 4477 | if (!conf->saved_nics) |
7b35f3d6 SH |
4478 | return; |
4479 | for (i=0; i < conf->num_savednics; i++) | |
4480 | free(conf->saved_nics[i].orig_name); | |
7b35f3d6 SH |
4481 | free(conf->saved_nics); |
4482 | } | |
4483 | ||
4184c3e1 SH |
4484 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
4485 | { | |
4486 | struct lxc_list *it,*next; | |
4487 | ||
4488 | lxc_list_for_each_safe(it, &conf->aliens, next) { | |
4489 | lxc_list_del(it); | |
4490 | free(it->elem); | |
4491 | free(it); | |
4492 | } | |
4493 | } | |
4494 | ||
c7b15d1e | 4495 | void lxc_clear_includes(struct lxc_conf *conf) |
f979ac15 SH |
4496 | { |
4497 | struct lxc_list *it,*next; | |
4498 | ||
4499 | lxc_list_for_each_safe(it, &conf->includes, next) { | |
4500 | lxc_list_del(it); | |
4501 | free(it->elem); | |
4502 | free(it); | |
4503 | } | |
4504 | } | |
4505 | ||
8eb5694b SH |
4506 | void lxc_conf_free(struct lxc_conf *conf) |
4507 | { | |
4508 | if (!conf) | |
4509 | return; | |
858377e4 SH |
4510 | if (current_config == conf) |
4511 | current_config = NULL; | |
f10fad2f ME |
4512 | free(conf->console.log_path); |
4513 | free(conf->console.path); | |
4514 | free(conf->rootfs.mount); | |
b3b8c97f | 4515 | free(conf->rootfs.bdev_type); |
f10fad2f ME |
4516 | free(conf->rootfs.options); |
4517 | free(conf->rootfs.path); | |
f10fad2f | 4518 | free(conf->logfile); |
858377e4 SH |
4519 | if (conf->logfd != -1) |
4520 | close(conf->logfd); | |
f10fad2f ME |
4521 | free(conf->utsname); |
4522 | free(conf->ttydir); | |
4523 | free(conf->fstab); | |
4524 | free(conf->rcfile); | |
4525 | free(conf->init_cmd); | |
6b0d5538 | 4526 | free(conf->unexpanded_config); |
393903d1 | 4527 | free(conf->pty_names); |
76d0127f | 4528 | free(conf->syslog); |
c302b476 | 4529 | lxc_free_networks(&conf->network); |
f10fad2f ME |
4530 | free(conf->lsm_aa_profile); |
4531 | free(conf->lsm_se_context); | |
769872f9 | 4532 | lxc_seccomp_free(conf); |
8eb5694b | 4533 | lxc_clear_config_caps(conf); |
1fb86a7c | 4534 | lxc_clear_config_keepcaps(conf); |
8eb5694b | 4535 | lxc_clear_cgroups(conf, "lxc.cgroup"); |
17ed13a3 | 4536 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 4537 | lxc_clear_mount_entries(conf); |
7b35f3d6 | 4538 | lxc_clear_saved_nics(conf); |
27c27d73 | 4539 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 4540 | lxc_clear_groups(conf); |
f979ac15 | 4541 | lxc_clear_includes(conf); |
761d81ca | 4542 | lxc_clear_aliens(conf); |
ab799c0b | 4543 | lxc_clear_environment(conf); |
240d4b74 | 4544 | lxc_clear_limits(conf, "lxc.prlimit"); |
8eb5694b SH |
4545 | free(conf); |
4546 | } | |
4355ab5f SH |
4547 | |
4548 | struct userns_fn_data { | |
4549 | int (*fn)(void *); | |
c9b7c33e | 4550 | const char *fn_name; |
4355ab5f SH |
4551 | void *arg; |
4552 | int p[2]; | |
4553 | }; | |
4554 | ||
4555 | static int run_userns_fn(void *data) | |
4556 | { | |
4557 | struct userns_fn_data *d = data; | |
4558 | char c; | |
4355ab5f | 4559 | |
f8aa4bf3 | 4560 | /* Close write end of the pipe. */ |
4355ab5f | 4561 | close(d->p[1]); |
f8aa4bf3 CB |
4562 | |
4563 | /* Wait for parent to finish establishing a new mapping in the user | |
4564 | * namespace we are executing in. | |
4565 | */ | |
4355ab5f SH |
4566 | if (read(d->p[0], &c, 1) != 1) |
4567 | return -1; | |
f8aa4bf3 CB |
4568 | |
4569 | /* Close read end of the pipe. */ | |
4355ab5f | 4570 | close(d->p[0]); |
f8aa4bf3 | 4571 | |
c9b7c33e CB |
4572 | if (d->fn_name) |
4573 | TRACE("calling function \"%s\"", d->fn_name); | |
f8aa4bf3 | 4574 | /* Call function to run. */ |
4355ab5f SH |
4575 | return d->fn(d->arg); |
4576 | } | |
4577 | ||
339efad9 | 4578 | static struct id_map *mapped_hostid_entry(struct lxc_conf *conf, unsigned id, |
f8aa4bf3 CB |
4579 | enum idtype idtype) |
4580 | { | |
4581 | struct lxc_list *it; | |
4582 | struct id_map *map; | |
4583 | struct id_map *retmap = NULL; | |
4584 | ||
4585 | lxc_list_for_each(it, &conf->id_map) { | |
4586 | map = it->elem; | |
4587 | if (map->idtype != idtype) | |
4588 | continue; | |
4589 | ||
4590 | if (id >= map->hostid && id < map->hostid + map->range) { | |
4591 | retmap = map; | |
4592 | break; | |
4593 | } | |
4594 | } | |
4595 | ||
4596 | if (!retmap) | |
4597 | return NULL; | |
4598 | ||
4599 | retmap = malloc(sizeof(*retmap)); | |
4600 | if (!retmap) | |
4601 | return NULL; | |
4602 | ||
4603 | memcpy(retmap, map, sizeof(*retmap)); | |
4604 | return retmap; | |
4605 | } | |
4606 | ||
4355ab5f | 4607 | /* |
f8aa4bf3 CB |
4608 | * Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
4609 | * existing one or establish a new one. | |
4355ab5f | 4610 | */ |
28a2d9e7 | 4611 | static struct id_map *idmap_add(struct lxc_conf *conf, uid_t id, enum idtype type) |
4355ab5f | 4612 | { |
28a2d9e7 | 4613 | int hostid_mapped; |
f8aa4bf3 | 4614 | struct id_map *entry = NULL; |
f8aa4bf3 | 4615 | |
28a2d9e7 CB |
4616 | /* Reuse existing mapping. */ |
4617 | entry = mapped_hostid_entry(conf, id, type); | |
4618 | if (entry) | |
4619 | return entry; | |
f8aa4bf3 | 4620 | |
28a2d9e7 CB |
4621 | /* Find new mapping. */ |
4622 | hostid_mapped = find_unmapped_nsid(conf, type); | |
4623 | if (hostid_mapped < 0) { | |
4624 | DEBUG("failed to find free mapping for id %d", id); | |
4625 | return NULL; | |
f8aa4bf3 | 4626 | } |
f8aa4bf3 | 4627 | |
28a2d9e7 CB |
4628 | entry = malloc(sizeof(*entry)); |
4629 | if (!entry) | |
4630 | return NULL; | |
4355ab5f | 4631 | |
28a2d9e7 CB |
4632 | entry->idtype = type; |
4633 | entry->nsid = hostid_mapped; | |
4634 | entry->hostid = (unsigned long)id; | |
4635 | entry->range = 1; | |
4355ab5f | 4636 | |
28a2d9e7 | 4637 | return entry; |
4355ab5f SH |
4638 | } |
4639 | ||
f8aa4bf3 CB |
4640 | /* Run a function in a new user namespace. |
4641 | * The caller's euid/egid will be mapped if it is not already. | |
4642 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
4643 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
4644 | * This means we require only to establish a mapping from: | |
4645 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
4646 | * - the container root -> some sub{g,u}id | |
4647 | * The former we add, if the user did not specifiy a mapping. The latter we | |
4648 | * retrieve from the ontainer's configured {g,u}id mappings as it must have been | |
4649 | * there to start the container in the first place. | |
4355ab5f | 4650 | */ |
c9b7c33e CB |
4651 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data, |
4652 | const char *fn_name) | |
4355ab5f | 4653 | { |
f8aa4bf3 CB |
4654 | pid_t pid; |
4655 | uid_t euid, egid; | |
4355ab5f | 4656 | struct userns_fn_data d; |
4355ab5f | 4657 | int p[2]; |
f8aa4bf3 CB |
4658 | struct lxc_list *it; |
4659 | struct id_map *map; | |
4660 | char c = '1'; | |
4661 | int ret = -1; | |
4662 | struct lxc_list *idmap = NULL, *tmplist = NULL; | |
28a2d9e7 CB |
4663 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, |
4664 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4355ab5f | 4665 | |
4355ab5f | 4666 | ret = pipe(p); |
4355ab5f SH |
4667 | if (ret < 0) { |
4668 | SYSERROR("opening pipe"); | |
4669 | return -1; | |
4670 | } | |
4671 | d.fn = fn; | |
c9b7c33e | 4672 | d.fn_name = fn_name; |
4355ab5f SH |
4673 | d.arg = data; |
4674 | d.p[0] = p[0]; | |
4675 | d.p[1] = p[1]; | |
f8aa4bf3 CB |
4676 | |
4677 | /* Clone child in new user namespace. */ | |
4355ab5f | 4678 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER); |
f8aa4bf3 CB |
4679 | if (pid < 0) { |
4680 | ERROR("failed to clone child process in new user namespace"); | |
4681 | goto on_error; | |
4682 | } | |
4683 | ||
4355ab5f | 4684 | close(p[0]); |
4355ab5f SH |
4685 | p[0] = -1; |
4686 | ||
f8aa4bf3 CB |
4687 | /* Find container root. */ |
4688 | lxc_list_for_each(it, &conf->id_map) { | |
4689 | map = it->elem; | |
4690 | ||
4691 | if (map->nsid != 0) | |
4692 | continue; | |
4693 | ||
4694 | if (map->idtype == ID_TYPE_UID && container_root_uid == NULL) { | |
4695 | container_root_uid = malloc(sizeof(*container_root_uid)); | |
4696 | if (!container_root_uid) | |
4697 | goto on_error; | |
4698 | container_root_uid->idtype = map->idtype; | |
4699 | container_root_uid->hostid = map->hostid; | |
4700 | container_root_uid->nsid = 0; | |
4701 | container_root_uid->range = map->range; | |
4702 | } else if (map->idtype == ID_TYPE_GID && container_root_gid == NULL) { | |
4703 | container_root_gid = malloc(sizeof(*container_root_gid)); | |
4704 | if (!container_root_gid) | |
4705 | goto on_error; | |
4706 | container_root_gid->idtype = map->idtype; | |
4707 | container_root_gid->hostid = map->hostid; | |
4708 | container_root_gid->nsid = 0; | |
4709 | container_root_gid->range = map->range; | |
4710 | } | |
4711 | ||
4712 | /* Found container root. */ | |
4713 | if (container_root_uid && container_root_gid) | |
4714 | break; | |
4715 | } | |
4716 | ||
4717 | /* This is actually checked earlier but it can't hurt. */ | |
4718 | if (!container_root_uid || !container_root_gid) { | |
4719 | ERROR("no mapping for container root found"); | |
4720 | goto on_error; | |
4721 | } | |
4722 | ||
1d90e064 CB |
4723 | host_uid_map = container_root_uid; |
4724 | host_gid_map = container_root_gid; | |
4725 | ||
f8aa4bf3 CB |
4726 | /* Check whether the {g,u}id of the user has a mapping. */ |
4727 | euid = geteuid(); | |
4728 | egid = getegid(); | |
1d90e064 | 4729 | if (euid != container_root_uid->hostid) |
28a2d9e7 CB |
4730 | host_uid_map = idmap_add(conf, euid, ID_TYPE_UID); |
4731 | ||
1d90e064 | 4732 | if (egid != container_root_gid->hostid) |
28a2d9e7 CB |
4733 | host_gid_map = idmap_add(conf, egid, ID_TYPE_GID); |
4734 | ||
4735 | if (!host_uid_map) { | |
4736 | DEBUG("failed to find mapping for uid %d", euid); | |
f8aa4bf3 CB |
4737 | goto on_error; |
4738 | } | |
4739 | ||
28a2d9e7 CB |
4740 | if (!host_gid_map) { |
4741 | DEBUG("failed to find mapping for gid %d", egid); | |
4742 | goto on_error; | |
4743 | } | |
4744 | ||
4745 | /* Allocate new {g,u}id map list. */ | |
4746 | idmap = malloc(sizeof(*idmap)); | |
4747 | if (!idmap) | |
4748 | goto on_error; | |
4749 | lxc_list_init(idmap); | |
4750 | ||
f8aa4bf3 CB |
4751 | /* Add container root to the map. */ |
4752 | tmplist = malloc(sizeof(*tmplist)); | |
4753 | if (!tmplist) | |
4754 | goto on_error; | |
4755 | lxc_list_add_elem(tmplist, container_root_uid); | |
4756 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4757 | |
1d90e064 | 4758 | if (host_uid_map && (host_uid_map != container_root_uid)) { |
28a2d9e7 CB |
4759 | /* idmap will now keep track of that memory. */ |
4760 | container_root_uid = NULL; | |
4761 | ||
4762 | /* Add container root to the map. */ | |
4763 | tmplist = malloc(sizeof(*tmplist)); | |
4764 | if (!tmplist) | |
4765 | goto on_error; | |
4766 | lxc_list_add_elem(tmplist, host_uid_map); | |
4767 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4768 | } |
1d90e064 CB |
4769 | /* idmap will now keep track of that memory. */ |
4770 | container_root_uid = NULL; | |
4771 | /* idmap will now keep track of that memory. */ | |
4772 | host_uid_map = NULL; | |
f8aa4bf3 CB |
4773 | |
4774 | tmplist = malloc(sizeof(*tmplist)); | |
4775 | if (!tmplist) | |
4776 | goto on_error; | |
4777 | lxc_list_add_elem(tmplist, container_root_gid); | |
4778 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4779 | |
1d90e064 | 4780 | if (host_gid_map && (host_gid_map != container_root_gid)) { |
28a2d9e7 CB |
4781 | /* idmap will now keep track of that memory. */ |
4782 | container_root_gid = NULL; | |
4783 | ||
4784 | tmplist = malloc(sizeof(*tmplist)); | |
4785 | if (!tmplist) | |
4786 | goto on_error; | |
4787 | lxc_list_add_elem(tmplist, host_gid_map); | |
4788 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4789 | } |
1d90e064 CB |
4790 | /* idmap will now keep track of that memory. */ |
4791 | container_root_gid = NULL; | |
4792 | /* idmap will now keep track of that memory. */ | |
4793 | host_gid_map = NULL; | |
f8aa4bf3 | 4794 | |
4b73005c CB |
4795 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || |
4796 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
f8aa4bf3 CB |
4797 | lxc_list_for_each(it, idmap) { |
4798 | map = it->elem; | |
4799 | TRACE("establishing %cid mapping for \"%d\" in new " | |
4800 | "user namespace: nsuid %lu - hostid %lu - range " | |
4801 | "%lu", | |
4802 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4803 | map->nsid, map->hostid, map->range); | |
4804 | } | |
4355ab5f SH |
4805 | } |
4806 | ||
f8aa4bf3 | 4807 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 4808 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 CB |
4809 | if (ret < 0) { |
4810 | ERROR("error setting up {g,u}id mappings for child process " | |
4811 | "\"%d\"", | |
4812 | pid); | |
4813 | goto on_error; | |
4355ab5f SH |
4814 | } |
4815 | ||
f8aa4bf3 | 4816 | /* Tell child to proceed. */ |
4355ab5f | 4817 | if (write(p[1], &c, 1) != 1) { |
f8aa4bf3 CB |
4818 | SYSERROR("failed telling child process \"%d\" to proceed", pid); |
4819 | goto on_error; | |
4355ab5f SH |
4820 | } |
4821 | ||
f8aa4bf3 | 4822 | /* Wait for child to finish. */ |
3139aead SG |
4823 | ret = wait_for_pid(pid); |
4824 | ||
f8aa4bf3 | 4825 | on_error: |
1d90e064 CB |
4826 | if (idmap) |
4827 | lxc_free_idmap(idmap); | |
4828 | if (container_root_uid) | |
4829 | free(container_root_uid); | |
4830 | if (container_root_gid) | |
4831 | free(container_root_gid); | |
4832 | if (host_uid_map && (host_uid_map != container_root_uid)) | |
4833 | free(host_uid_map); | |
4834 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4835 | free(host_gid_map); | |
3139aead | 4836 | |
4355ab5f SH |
4837 | if (p[0] != -1) |
4838 | close(p[0]); | |
4839 | close(p[1]); | |
f8aa4bf3 CB |
4840 | |
4841 | return ret; | |
4355ab5f | 4842 | } |
97e9cfa0 | 4843 | |
a96a8e8c | 4844 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4845 | static char* getuname(void) |
4846 | { | |
a96a8e8c | 4847 | struct passwd *result; |
97e9cfa0 | 4848 | |
a96a8e8c SH |
4849 | result = getpwuid(geteuid()); |
4850 | if (!result) | |
97e9cfa0 SH |
4851 | return NULL; |
4852 | ||
a96a8e8c | 4853 | return strdup(result->pw_name); |
97e9cfa0 SH |
4854 | } |
4855 | ||
a96a8e8c | 4856 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4857 | static char *getgname(void) |
4858 | { | |
a96a8e8c | 4859 | struct group *result; |
97e9cfa0 | 4860 | |
a96a8e8c SH |
4861 | result = getgrgid(getegid()); |
4862 | if (!result) | |
97e9cfa0 SH |
4863 | return NULL; |
4864 | ||
a96a8e8c | 4865 | return strdup(result->gr_name); |
97e9cfa0 SH |
4866 | } |
4867 | ||
a96a8e8c | 4868 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4869 | void suggest_default_idmap(void) |
4870 | { | |
4871 | FILE *f; | |
4872 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; | |
4873 | char *line = NULL; | |
4874 | char *uname, *gname; | |
4875 | size_t len = 0; | |
4876 | ||
4877 | if (!(uname = getuname())) | |
4878 | return; | |
4879 | ||
4880 | if (!(gname = getgname())) { | |
4881 | free(uname); | |
4882 | return; | |
4883 | } | |
4884 | ||
4885 | f = fopen(subuidfile, "r"); | |
4886 | if (!f) { | |
4887 | ERROR("Your system is not configured with subuids"); | |
4888 | free(gname); | |
4889 | free(uname); | |
4890 | return; | |
4891 | } | |
4892 | while (getline(&line, &len, f) != -1) { | |
b7930180 | 4893 | size_t no_newline = 0; |
97e9cfa0 SH |
4894 | char *p = strchr(line, ':'), *p2; |
4895 | if (*line == '#') | |
4896 | continue; | |
4897 | if (!p) | |
4898 | continue; | |
4899 | *p = '\0'; | |
4900 | p++; | |
4901 | if (strcmp(line, uname)) | |
4902 | continue; | |
4903 | p2 = strchr(p, ':'); | |
4904 | if (!p2) | |
4905 | continue; | |
4906 | *p2 = '\0'; | |
4907 | p2++; | |
4908 | if (!*p2) | |
4909 | continue; | |
b7930180 CB |
4910 | no_newline = strcspn(p2, "\n"); |
4911 | p2[no_newline] = '\0'; | |
4912 | ||
b7b2fde4 CB |
4913 | if (lxc_safe_uint(p, &uid) < 0) |
4914 | WARN("Could not parse UID."); | |
4915 | if (lxc_safe_uint(p2, &urange) < 0) | |
4916 | WARN("Could not parse UID range."); | |
97e9cfa0 SH |
4917 | } |
4918 | fclose(f); | |
4919 | ||
6be7389a | 4920 | f = fopen(subgidfile, "r"); |
97e9cfa0 SH |
4921 | if (!f) { |
4922 | ERROR("Your system is not configured with subgids"); | |
4923 | free(gname); | |
4924 | free(uname); | |
4925 | return; | |
4926 | } | |
4927 | while (getline(&line, &len, f) != -1) { | |
b7930180 | 4928 | size_t no_newline = 0; |
97e9cfa0 SH |
4929 | char *p = strchr(line, ':'), *p2; |
4930 | if (*line == '#') | |
4931 | continue; | |
4932 | if (!p) | |
4933 | continue; | |
4934 | *p = '\0'; | |
4935 | p++; | |
4936 | if (strcmp(line, uname)) | |
4937 | continue; | |
4938 | p2 = strchr(p, ':'); | |
4939 | if (!p2) | |
4940 | continue; | |
4941 | *p2 = '\0'; | |
4942 | p2++; | |
4943 | if (!*p2) | |
4944 | continue; | |
b7930180 CB |
4945 | no_newline = strcspn(p2, "\n"); |
4946 | p2[no_newline] = '\0'; | |
4947 | ||
b7b2fde4 CB |
4948 | if (lxc_safe_uint(p, &gid) < 0) |
4949 | WARN("Could not parse GID."); | |
4950 | if (lxc_safe_uint(p2, &grange) < 0) | |
4951 | WARN("Could not parse GID range."); | |
97e9cfa0 SH |
4952 | } |
4953 | fclose(f); | |
4954 | ||
f10fad2f | 4955 | free(line); |
97e9cfa0 SH |
4956 | |
4957 | if (!urange || !grange) { | |
4958 | ERROR("You do not have subuids or subgids allocated"); | |
4959 | ERROR("Unprivileged containers require subuids and subgids"); | |
4960 | return; | |
4961 | } | |
4962 | ||
4963 | ERROR("You must either run as root, or define uid mappings"); | |
4964 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4965 | ERROR("~/.config/lxc/default.conf:"); | |
4966 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
4967 | ERROR("lxc.id_map = u 0 %u %u", uid, urange); | |
4968 | ERROR("lxc.id_map = g 0 %u %u", gid, grange); | |
4969 | ||
4970 | free(gname); | |
4971 | free(uname); | |
4972 | } | |
aaf26830 | 4973 | |
a7307747 SH |
4974 | static void free_cgroup_settings(struct lxc_list *result) |
4975 | { | |
4976 | struct lxc_list *iterator, *next; | |
4977 | ||
4978 | lxc_list_for_each_safe(iterator, result, next) { | |
4979 | lxc_list_del(iterator); | |
4980 | free(iterator); | |
4981 | } | |
4982 | free(result); | |
4983 | } | |
4984 | ||
aaf26830 KT |
4985 | /* |
4986 | * Return the list of cgroup_settings sorted according to the following rules | |
4987 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes | |
4988 | */ | |
4989 | struct lxc_list *sort_cgroup_settings(struct lxc_list* cgroup_settings) | |
4990 | { | |
4991 | struct lxc_list *result; | |
4992 | struct lxc_list *memsw_limit = NULL; | |
4993 | struct lxc_list *it = NULL; | |
4994 | struct lxc_cgroup *cg = NULL; | |
4995 | struct lxc_list *item = NULL; | |
4996 | ||
4997 | result = malloc(sizeof(*result)); | |
fac7c663 KT |
4998 | if (!result) { |
4999 | ERROR("failed to allocate memory to sort cgroup settings"); | |
5000 | return NULL; | |
5001 | } | |
aaf26830 KT |
5002 | lxc_list_init(result); |
5003 | ||
5004 | /*Iterate over the cgroup settings and copy them to the output list*/ | |
5005 | lxc_list_for_each(it, cgroup_settings) { | |
5006 | item = malloc(sizeof(*item)); | |
fac7c663 KT |
5007 | if (!item) { |
5008 | ERROR("failed to allocate memory to sort cgroup settings"); | |
a7307747 | 5009 | free_cgroup_settings(result); |
fac7c663 KT |
5010 | return NULL; |
5011 | } | |
aaf26830 KT |
5012 | item->elem = it->elem; |
5013 | cg = it->elem; | |
5014 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
5015 | /* Store the memsw_limit location */ | |
5016 | memsw_limit = item; | |
5017 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && memsw_limit != NULL) { | |
4d5b72a1 | 5018 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found before |
aaf26830 KT |
5019 | * lxc.cgroup.memory.limit_in_bytes, swap these two items */ |
5020 | item->elem = memsw_limit->elem; | |
5021 | memsw_limit->elem = it->elem; | |
5022 | } | |
5023 | lxc_list_add_tail(result, item); | |
5024 | } | |
5025 | ||
5026 | return result; | |
a7307747 | 5027 | } |