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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 | ||
72d0e1cb | 237 | char *lxchook_names[NUM_LXC_HOOKS] = { |
52492063 | 238 | "pre-start", "pre-mount", "mount", "autodev", "start", "stop", "post-stop", "clone", "destroy" }; |
72d0e1cb | 239 | |
a589434e | 240 | typedef int (*instantiate_cb)(struct lxc_handler *, struct lxc_netdev *); |
0ad19a3f | 241 | |
998ac676 RT |
242 | struct mount_opt { |
243 | char *name; | |
244 | int clear; | |
245 | int flag; | |
246 | }; | |
247 | ||
81810dd1 DL |
248 | struct caps_opt { |
249 | char *name; | |
250 | int value; | |
251 | }; | |
252 | ||
c6d09e15 WB |
253 | struct limit_opt { |
254 | char *name; | |
255 | int value; | |
256 | }; | |
257 | ||
858377e4 SH |
258 | /* |
259 | * The lxc_conf of the container currently being worked on in an | |
260 | * API call | |
261 | * This is used in the error calls | |
262 | */ | |
263 | #ifdef HAVE_TLS | |
264 | __thread struct lxc_conf *current_config; | |
265 | #else | |
266 | struct lxc_conf *current_config; | |
267 | #endif | |
268 | ||
0769b82a CS |
269 | /* Declare this here, since we don't want to reshuffle the whole file. */ |
270 | static int in_caplist(int cap, struct lxc_list *caps); | |
271 | ||
a589434e JN |
272 | static int instantiate_veth(struct lxc_handler *, struct lxc_netdev *); |
273 | static int instantiate_macvlan(struct lxc_handler *, struct lxc_netdev *); | |
274 | static int instantiate_vlan(struct lxc_handler *, struct lxc_netdev *); | |
275 | static int instantiate_phys(struct lxc_handler *, struct lxc_netdev *); | |
276 | static int instantiate_empty(struct lxc_handler *, struct lxc_netdev *); | |
277 | static int instantiate_none(struct lxc_handler *, struct lxc_netdev *); | |
278 | ||
279 | static instantiate_cb netdev_conf[LXC_NET_MAXCONFTYPE + 1] = { | |
280 | [LXC_NET_VETH] = instantiate_veth, | |
281 | [LXC_NET_MACVLAN] = instantiate_macvlan, | |
282 | [LXC_NET_VLAN] = instantiate_vlan, | |
283 | [LXC_NET_PHYS] = instantiate_phys, | |
284 | [LXC_NET_EMPTY] = instantiate_empty, | |
285 | [LXC_NET_NONE] = instantiate_none, | |
0ad19a3f | 286 | }; |
287 | ||
74a2b586 JK |
288 | static int shutdown_veth(struct lxc_handler *, struct lxc_netdev *); |
289 | static int shutdown_macvlan(struct lxc_handler *, struct lxc_netdev *); | |
290 | static int shutdown_vlan(struct lxc_handler *, struct lxc_netdev *); | |
291 | static int shutdown_phys(struct lxc_handler *, struct lxc_netdev *); | |
292 | static int shutdown_empty(struct lxc_handler *, struct lxc_netdev *); | |
26b797f3 | 293 | static int shutdown_none(struct lxc_handler *, struct lxc_netdev *); |
74a2b586 | 294 | |
a589434e | 295 | static instantiate_cb netdev_deconf[LXC_NET_MAXCONFTYPE + 1] = { |
74a2b586 JK |
296 | [LXC_NET_VETH] = shutdown_veth, |
297 | [LXC_NET_MACVLAN] = shutdown_macvlan, | |
298 | [LXC_NET_VLAN] = shutdown_vlan, | |
299 | [LXC_NET_PHYS] = shutdown_phys, | |
300 | [LXC_NET_EMPTY] = shutdown_empty, | |
26b797f3 | 301 | [LXC_NET_NONE] = shutdown_none, |
74a2b586 JK |
302 | }; |
303 | ||
998ac676 | 304 | static struct mount_opt mount_opt[] = { |
470b359b CB |
305 | { "async", 1, MS_SYNCHRONOUS }, |
306 | { "atime", 1, MS_NOATIME }, | |
307 | { "bind", 0, MS_BIND }, | |
88d413d5 | 308 | { "defaults", 0, 0 }, |
88d413d5 | 309 | { "dev", 1, MS_NODEV }, |
470b359b | 310 | { "diratime", 1, MS_NODIRATIME }, |
88d413d5 | 311 | { "dirsync", 0, MS_DIRSYNC }, |
470b359b | 312 | { "exec", 1, MS_NOEXEC }, |
8912711c | 313 | { "lazytime", 0, MS_LAZYTIME }, |
88d413d5 | 314 | { "mand", 0, MS_MANDLOCK }, |
88d413d5 | 315 | { "noatime", 0, MS_NOATIME }, |
470b359b | 316 | { "nodev", 0, MS_NODEV }, |
88d413d5 | 317 | { "nodiratime", 0, MS_NODIRATIME }, |
470b359b CB |
318 | { "noexec", 0, MS_NOEXEC }, |
319 | { "nomand", 1, MS_MANDLOCK }, | |
320 | { "norelatime", 1, MS_RELATIME }, | |
321 | { "nostrictatime", 1, MS_STRICTATIME }, | |
322 | { "nosuid", 0, MS_NOSUID }, | |
88d413d5 SW |
323 | { "rbind", 0, MS_BIND|MS_REC }, |
324 | { "relatime", 0, MS_RELATIME }, | |
470b359b CB |
325 | { "remount", 0, MS_REMOUNT }, |
326 | { "ro", 0, MS_RDONLY }, | |
327 | { "rw", 1, MS_RDONLY }, | |
88d413d5 | 328 | { "strictatime", 0, MS_STRICTATIME }, |
470b359b CB |
329 | { "suid", 1, MS_NOSUID }, |
330 | { "sync", 0, MS_SYNCHRONOUS }, | |
88d413d5 | 331 | { NULL, 0, 0 }, |
998ac676 RT |
332 | }; |
333 | ||
e37dda71 | 334 | #if HAVE_LIBCAP |
81810dd1 | 335 | static struct caps_opt caps_opt[] = { |
a6afdde9 | 336 | { "chown", CAP_CHOWN }, |
1e11be34 DL |
337 | { "dac_override", CAP_DAC_OVERRIDE }, |
338 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
339 | { "fowner", CAP_FOWNER }, | |
340 | { "fsetid", CAP_FSETID }, | |
81810dd1 DL |
341 | { "kill", CAP_KILL }, |
342 | { "setgid", CAP_SETGID }, | |
343 | { "setuid", CAP_SETUID }, | |
344 | { "setpcap", CAP_SETPCAP }, | |
345 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
346 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
347 | { "net_broadcast", CAP_NET_BROADCAST }, | |
348 | { "net_admin", CAP_NET_ADMIN }, | |
349 | { "net_raw", CAP_NET_RAW }, | |
350 | { "ipc_lock", CAP_IPC_LOCK }, | |
351 | { "ipc_owner", CAP_IPC_OWNER }, | |
352 | { "sys_module", CAP_SYS_MODULE }, | |
353 | { "sys_rawio", CAP_SYS_RAWIO }, | |
354 | { "sys_chroot", CAP_SYS_CHROOT }, | |
355 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
356 | { "sys_pacct", CAP_SYS_PACCT }, | |
357 | { "sys_admin", CAP_SYS_ADMIN }, | |
358 | { "sys_boot", CAP_SYS_BOOT }, | |
359 | { "sys_nice", CAP_SYS_NICE }, | |
360 | { "sys_resource", CAP_SYS_RESOURCE }, | |
361 | { "sys_time", CAP_SYS_TIME }, | |
362 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
363 | { "mknod", CAP_MKNOD }, | |
364 | { "lease", CAP_LEASE }, | |
57b837e2 CB |
365 | #ifdef CAP_AUDIT_READ |
366 | { "audit_read", CAP_AUDIT_READ }, | |
367 | #endif | |
9527e566 | 368 | #ifdef CAP_AUDIT_WRITE |
81810dd1 | 369 | { "audit_write", CAP_AUDIT_WRITE }, |
9527e566 FW |
370 | #endif |
371 | #ifdef CAP_AUDIT_CONTROL | |
81810dd1 | 372 | { "audit_control", CAP_AUDIT_CONTROL }, |
9527e566 | 373 | #endif |
81810dd1 DL |
374 | { "setfcap", CAP_SETFCAP }, |
375 | { "mac_override", CAP_MAC_OVERRIDE }, | |
376 | { "mac_admin", CAP_MAC_ADMIN }, | |
5170c716 CS |
377 | #ifdef CAP_SYSLOG |
378 | { "syslog", CAP_SYSLOG }, | |
379 | #endif | |
380 | #ifdef CAP_WAKE_ALARM | |
381 | { "wake_alarm", CAP_WAKE_ALARM }, | |
382 | #endif | |
2b54359b CB |
383 | #ifdef CAP_BLOCK_SUSPEND |
384 | { "block_suspend", CAP_BLOCK_SUSPEND }, | |
385 | #endif | |
81810dd1 | 386 | }; |
495d2046 SG |
387 | #else |
388 | static struct caps_opt caps_opt[] = {}; | |
389 | #endif | |
81810dd1 | 390 | |
c6d09e15 WB |
391 | static struct limit_opt limit_opt[] = { |
392 | #ifdef RLIMIT_AS | |
393 | { "as", RLIMIT_AS }, | |
394 | #endif | |
395 | #ifdef RLIMIT_CORE | |
396 | { "core", RLIMIT_CORE }, | |
397 | #endif | |
398 | #ifdef RLIMIT_CPU | |
399 | { "cpu", RLIMIT_CPU }, | |
400 | #endif | |
401 | #ifdef RLIMIT_DATA | |
402 | { "data", RLIMIT_DATA }, | |
403 | #endif | |
404 | #ifdef RLIMIT_FSIZE | |
405 | { "fsize", RLIMIT_FSIZE }, | |
406 | #endif | |
407 | #ifdef RLIMIT_LOCKS | |
408 | { "locks", RLIMIT_LOCKS }, | |
409 | #endif | |
410 | #ifdef RLIMIT_MEMLOCK | |
411 | { "memlock", RLIMIT_MEMLOCK }, | |
412 | #endif | |
413 | #ifdef RLIMIT_MSGQUEUE | |
414 | { "msgqueue", RLIMIT_MSGQUEUE }, | |
415 | #endif | |
416 | #ifdef RLIMIT_NICE | |
417 | { "nice", RLIMIT_NICE }, | |
418 | #endif | |
419 | #ifdef RLIMIT_NOFILE | |
420 | { "nofile", RLIMIT_NOFILE }, | |
421 | #endif | |
422 | #ifdef RLIMIT_NPROC | |
423 | { "nproc", RLIMIT_NPROC }, | |
424 | #endif | |
425 | #ifdef RLIMIT_RSS | |
426 | { "rss", RLIMIT_RSS }, | |
427 | #endif | |
428 | #ifdef RLIMIT_RTPRIO | |
429 | { "rtprio", RLIMIT_RTPRIO }, | |
430 | #endif | |
431 | #ifdef RLIMIT_RTTIME | |
432 | { "rttime", RLIMIT_RTTIME }, | |
433 | #endif | |
434 | #ifdef RLIMIT_SIGPENDING | |
435 | { "sigpending", RLIMIT_SIGPENDING }, | |
436 | #endif | |
437 | #ifdef RLIMIT_STACK | |
438 | { "stack", RLIMIT_STACK }, | |
439 | #endif | |
440 | }; | |
441 | ||
91c3830e SH |
442 | static int run_buffer(char *buffer) |
443 | { | |
ebec9176 | 444 | struct lxc_popen_FILE *f; |
91c3830e | 445 | char *output; |
8e7da691 | 446 | int ret; |
91c3830e | 447 | |
ebec9176 | 448 | f = lxc_popen(buffer); |
91c3830e | 449 | if (!f) { |
062b72c6 | 450 | SYSERROR("Failed to popen() %s.", buffer); |
91c3830e SH |
451 | return -1; |
452 | } | |
453 | ||
454 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
455 | if (!output) { | |
062b72c6 | 456 | ERROR("Failed to allocate memory for %s.", buffer); |
ebec9176 | 457 | lxc_pclose(f); |
91c3830e SH |
458 | return -1; |
459 | } | |
460 | ||
062b72c6 CB |
461 | while (fgets(output, LXC_LOG_BUFFER_SIZE, f->f)) |
462 | DEBUG("Script %s with output: %s.", buffer, output); | |
91c3830e SH |
463 | |
464 | free(output); | |
465 | ||
ebec9176 | 466 | ret = lxc_pclose(f); |
8e7da691 | 467 | if (ret == -1) { |
062b72c6 | 468 | SYSERROR("Script exited with error."); |
91c3830e | 469 | return -1; |
8e7da691 | 470 | } else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) { |
062b72c6 | 471 | ERROR("Script exited with status %d.", WEXITSTATUS(ret)); |
8e7da691 DE |
472 | return -1; |
473 | } else if (WIFSIGNALED(ret)) { | |
062b72c6 | 474 | ERROR("Script terminated by signal %d.", WTERMSIG(ret)); |
8e7da691 | 475 | return -1; |
91c3830e SH |
476 | } |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
148e91f5 | 481 | static int run_script_argv(const char *name, const char *section, |
062b72c6 CB |
482 | const char *script, const char *hook, |
483 | const char *lxcpath, char **argsin) | |
148e91f5 SH |
484 | { |
485 | int ret, i; | |
486 | char *buffer; | |
487 | size_t size = 0; | |
488 | ||
062b72c6 | 489 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\".", |
148e91f5 SH |
490 | script, name, section); |
491 | ||
062b72c6 | 492 | for (i = 0; argsin && argsin[i]; i++) |
148e91f5 SH |
493 | size += strlen(argsin[i]) + 1; |
494 | ||
495 | size += strlen(hook) + 1; | |
496 | ||
497 | size += strlen(script); | |
498 | size += strlen(name); | |
499 | size += strlen(section); | |
500 | size += 3; | |
501 | ||
502 | if (size > INT_MAX) | |
503 | return -1; | |
504 | ||
505 | buffer = alloca(size); | |
506 | if (!buffer) { | |
062b72c6 | 507 | ERROR("Failed to allocate memory."); |
148e91f5 SH |
508 | return -1; |
509 | } | |
510 | ||
062b72c6 CB |
511 | ret = |
512 | snprintf(buffer, size, "%s %s %s %s", script, name, section, hook); | |
513 | if (ret < 0 || (size_t)ret >= size) { | |
514 | ERROR("Script name too long."); | |
148e91f5 SH |
515 | return -1; |
516 | } | |
517 | ||
062b72c6 CB |
518 | for (i = 0; argsin && argsin[i]; i++) { |
519 | int len = size - ret; | |
148e91f5 SH |
520 | int rc; |
521 | rc = snprintf(buffer + ret, len, " %s", argsin[i]); | |
522 | if (rc < 0 || rc >= len) { | |
062b72c6 | 523 | ERROR("Script args too long."); |
148e91f5 SH |
524 | return -1; |
525 | } | |
526 | ret += rc; | |
527 | } | |
528 | ||
529 | return run_buffer(buffer); | |
530 | } | |
531 | ||
062b72c6 CB |
532 | static int run_script(const char *name, const char *section, const char *script, |
533 | ...) | |
e3b4c4c4 | 534 | { |
abbfd20b | 535 | int ret; |
91c3830e | 536 | char *buffer, *p; |
abbfd20b DL |
537 | size_t size = 0; |
538 | va_list ap; | |
751d9dcd | 539 | |
062b72c6 | 540 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\".", |
751d9dcd | 541 | script, name, section); |
e3b4c4c4 | 542 | |
abbfd20b DL |
543 | va_start(ap, script); |
544 | while ((p = va_arg(ap, char *))) | |
95642a10 | 545 | size += strlen(p) + 1; |
abbfd20b DL |
546 | va_end(ap); |
547 | ||
548 | size += strlen(script); | |
549 | size += strlen(name); | |
550 | size += strlen(section); | |
95642a10 | 551 | size += 3; |
abbfd20b | 552 | |
95642a10 MS |
553 | if (size > INT_MAX) |
554 | return -1; | |
555 | ||
556 | buffer = alloca(size); | |
abbfd20b | 557 | if (!buffer) { |
062b72c6 | 558 | ERROR("Failed to allocate memory."); |
751d9dcd DL |
559 | return -1; |
560 | } | |
561 | ||
9ba8130c SH |
562 | ret = snprintf(buffer, size, "%s %s %s", script, name, section); |
563 | if (ret < 0 || ret >= size) { | |
062b72c6 | 564 | ERROR("Script name too long."); |
9ba8130c SH |
565 | return -1; |
566 | } | |
751d9dcd | 567 | |
abbfd20b | 568 | va_start(ap, script); |
9ba8130c | 569 | while ((p = va_arg(ap, char *))) { |
062b72c6 | 570 | int len = size - ret; |
9ba8130c SH |
571 | int rc; |
572 | rc = snprintf(buffer + ret, len, " %s", p); | |
573 | if (rc < 0 || rc >= len) { | |
062b72c6 | 574 | ERROR("Script args too long."); |
9ba8130c SH |
575 | return -1; |
576 | } | |
577 | ret += rc; | |
578 | } | |
abbfd20b | 579 | va_end(ap); |
751d9dcd | 580 | |
91c3830e | 581 | return run_buffer(buffer); |
e3b4c4c4 ST |
582 | } |
583 | ||
0c547523 SH |
584 | /* |
585 | * pin_rootfs | |
b7ed4bf0 CS |
586 | * if rootfs is a directory, then open ${rootfs}/lxc.hold for writing for |
587 | * the duration of the container run, to prevent the container from marking | |
588 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
589 | * no name pollution is happens | |
0c547523 SH |
590 | * return -1 on error. |
591 | * return -2 if nothing needed to be pinned. | |
592 | * return an open fd (>=0) if we pinned it. | |
593 | */ | |
594 | int pin_rootfs(const char *rootfs) | |
595 | { | |
596 | char absrootfs[MAXPATHLEN]; | |
597 | char absrootfspin[MAXPATHLEN]; | |
598 | struct stat s; | |
599 | int ret, fd; | |
600 | ||
e99ee0de | 601 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 602 | return -2; |
e99ee0de | 603 | |
00ec333b | 604 | if (!realpath(rootfs, absrootfs)) |
9be53773 | 605 | return -2; |
0c547523 | 606 | |
00ec333b | 607 | if (access(absrootfs, F_OK)) |
0c547523 | 608 | return -1; |
0c547523 | 609 | |
00ec333b | 610 | if (stat(absrootfs, &s)) |
0c547523 | 611 | return -1; |
0c547523 | 612 | |
72f919c4 | 613 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
614 | return -2; |
615 | ||
b7ed4bf0 | 616 | ret = snprintf(absrootfspin, MAXPATHLEN, "%s/lxc.hold", absrootfs); |
00ec333b | 617 | if (ret >= MAXPATHLEN) |
0c547523 | 618 | return -1; |
0c547523 SH |
619 | |
620 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR|S_IRUSR); | |
b7ed4bf0 CS |
621 | if (fd < 0) |
622 | return fd; | |
623 | (void)unlink(absrootfspin); | |
0c547523 SH |
624 | return fd; |
625 | } | |
626 | ||
e2a7e8dc SH |
627 | /* |
628 | * If we are asking to remount something, make sure that any | |
629 | * NOEXEC etc are honored. | |
630 | */ | |
631 | static unsigned long add_required_remount_flags(const char *s, const char *d, | |
632 | unsigned long flags) | |
633 | { | |
614305f3 | 634 | #ifdef HAVE_STATVFS |
e2a7e8dc SH |
635 | struct statvfs sb; |
636 | unsigned long required_flags = 0; | |
637 | ||
638 | if (!(flags & MS_REMOUNT)) | |
639 | return flags; | |
640 | ||
641 | if (!s) | |
642 | s = d; | |
643 | ||
644 | if (!s) | |
645 | return flags; | |
646 | if (statvfs(s, &sb) < 0) | |
647 | return flags; | |
648 | ||
649 | if (sb.f_flag & MS_NOSUID) | |
650 | required_flags |= MS_NOSUID; | |
651 | if (sb.f_flag & MS_NODEV) | |
652 | required_flags |= MS_NODEV; | |
653 | if (sb.f_flag & MS_RDONLY) | |
654 | required_flags |= MS_RDONLY; | |
655 | if (sb.f_flag & MS_NOEXEC) | |
656 | required_flags |= MS_NOEXEC; | |
657 | ||
658 | return flags | required_flags; | |
614305f3 SH |
659 | #else |
660 | return flags; | |
661 | #endif | |
e2a7e8dc SH |
662 | } |
663 | ||
4fb3cba5 | 664 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 665 | { |
368bbc02 | 666 | int r; |
80e80c40 | 667 | int i; |
b06b8511 CS |
668 | static struct { |
669 | int match_mask; | |
670 | int match_flag; | |
671 | const char *source; | |
672 | const char *destination; | |
673 | const char *fstype; | |
674 | unsigned long flags; | |
675 | const char *options; | |
676 | } default_mounts[] = { | |
677 | /* Read-only bind-mounting... In older kernels, doing that required | |
678 | * to do one MS_BIND mount and then MS_REMOUNT|MS_RDONLY the same | |
679 | * one. According to mount(2) manpage, MS_BIND honors MS_RDONLY from | |
680 | * kernel 2.6.26 onwards. However, this apparently does not work on | |
681 | * kernel 3.8. Unfortunately, on that very same kernel, doing the | |
682 | * same trick as above doesn't seem to work either, there one needs | |
683 | * to ALSO specify MS_BIND for the remount, otherwise the entire | |
684 | * fs is remounted read-only or the mount fails because it's busy... | |
685 | * MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for kernels as low as | |
686 | * 2.6.32... | |
368bbc02 | 687 | */ |
f24a52d5 | 688 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
592fd47a SH |
689 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
690 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL }, | |
f24a52d5 SG |
691 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, |
692 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
592fd47a | 693 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL }, |
f24a52d5 SG |
694 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, |
695 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
696 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
697 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
698 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
699 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
700 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys", "%r/sys", NULL, MS_BIND, NULL }, | |
701 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
702 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
703 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys/devices/virtual/net/devices/virtual/net", "%r/sys/devices/virtual/net", NULL, MS_BIND, NULL }, | |
704 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys/devices/virtual/net", NULL, MS_REMOUNT|MS_BIND|MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL }, | |
705 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 706 | }; |
368bbc02 | 707 | |
b06b8511 CS |
708 | for (i = 0; default_mounts[i].match_mask; i++) { |
709 | if ((flags & default_mounts[i].match_mask) == default_mounts[i].match_flag) { | |
710 | char *source = NULL; | |
711 | char *destination = NULL; | |
712 | int saved_errno; | |
e2a7e8dc | 713 | unsigned long mflags; |
b06b8511 CS |
714 | |
715 | if (default_mounts[i].source) { | |
716 | /* will act like strdup if %r is not present */ | |
8ede5f4c | 717 | source = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].source); |
b06b8511 CS |
718 | if (!source) { |
719 | SYSERROR("memory allocation error"); | |
720 | return -1; | |
721 | } | |
722 | } | |
cc4fd506 SH |
723 | if (!default_mounts[i].destination) { |
724 | ERROR("BUG: auto mounts destination %d was NULL", i); | |
b2f44b4d | 725 | free(source); |
cc4fd506 SH |
726 | return -1; |
727 | } | |
728 | /* will act like strdup if %r is not present */ | |
729 | destination = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].destination); | |
730 | if (!destination) { | |
731 | saved_errno = errno; | |
732 | SYSERROR("memory allocation error"); | |
733 | free(source); | |
734 | errno = saved_errno; | |
735 | return -1; | |
b06b8511 | 736 | } |
e2a7e8dc SH |
737 | mflags = add_required_remount_flags(source, destination, |
738 | default_mounts[i].flags); | |
592fd47a | 739 | r = safe_mount(source, destination, default_mounts[i].fstype, mflags, default_mounts[i].options, conf->rootfs.path ? conf->rootfs.mount : NULL); |
b06b8511 | 740 | saved_errno = errno; |
b88ff9a0 SG |
741 | if (r < 0 && errno == ENOENT) { |
742 | INFO("Mount source or target for %s on %s doesn't exist. Skipping.", source, destination); | |
743 | r = 0; | |
744 | } | |
745 | else if (r < 0) | |
e2a7e8dc | 746 | SYSERROR("error mounting %s on %s flags %lu", source, destination, mflags); |
f24a52d5 | 747 | |
b06b8511 CS |
748 | free(source); |
749 | free(destination); | |
750 | if (r < 0) { | |
b06b8511 CS |
751 | errno = saved_errno; |
752 | return -1; | |
753 | } | |
368bbc02 | 754 | } |
368bbc02 CS |
755 | } |
756 | ||
b06b8511 | 757 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
758 | int cg_flags; |
759 | ||
760 | cg_flags = flags & LXC_AUTO_CGROUP_MASK; | |
761 | /* If the type of cgroup mount was not specified, it depends on the | |
762 | * container's capabilities as to what makes sense: if we have | |
763 | * CAP_SYS_ADMIN, the read-only part can be remounted read-write | |
764 | * anyway, so we may as well default to read-write; then the admin | |
765 | * will not be given a false sense of security. (And if they really | |
766 | * want mixed r/o r/w, then they can explicitly specify :mixed.) | |
767 | * OTOH, if the container lacks CAP_SYS_ADMIN, do only default to | |
768 | * :mixed, because then the container can't remount it read-write. */ | |
769 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { | |
770 | int has_sys_admin = 0; | |
b0ee5983 CB |
771 | |
772 | if (!lxc_list_empty(&conf->keepcaps)) | |
0769b82a | 773 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); |
b0ee5983 | 774 | else |
0769b82a | 775 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); |
b0ee5983 CB |
776 | |
777 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) | |
0769b82a | 778 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; |
b0ee5983 | 779 | else |
0769b82a | 780 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; |
0769b82a CS |
781 | } |
782 | ||
8ede5f4c | 783 | if (!cgroup_mount(conf->rootfs.path ? conf->rootfs.mount : "", handler, cg_flags)) { |
368bbc02 | 784 | SYSERROR("error mounting /sys/fs/cgroup"); |
b06b8511 | 785 | return -1; |
368bbc02 CS |
786 | } |
787 | } | |
788 | ||
368bbc02 | 789 | return 0; |
368bbc02 CS |
790 | } |
791 | ||
4e5440c6 | 792 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 793 | { |
4e5440c6 DL |
794 | if (!utsname) |
795 | return 0; | |
0ad19a3f | 796 | |
4e5440c6 DL |
797 | if (sethostname(utsname->nodename, strlen(utsname->nodename))) { |
798 | SYSERROR("failed to set the hostname to '%s'", utsname->nodename); | |
0ad19a3f | 799 | return -1; |
800 | } | |
801 | ||
4e5440c6 | 802 | INFO("'%s' hostname has been setup", utsname->nodename); |
cd54d859 | 803 | |
0ad19a3f | 804 | return 0; |
805 | } | |
806 | ||
69aa6655 DE |
807 | struct dev_symlinks { |
808 | const char *oldpath; | |
809 | const char *name; | |
810 | }; | |
811 | ||
812 | static const struct dev_symlinks dev_symlinks[] = { | |
813 | {"/proc/self/fd", "fd"}, | |
814 | {"/proc/self/fd/0", "stdin"}, | |
815 | {"/proc/self/fd/1", "stdout"}, | |
816 | {"/proc/self/fd/2", "stderr"}, | |
817 | }; | |
818 | ||
819 | static int setup_dev_symlinks(const struct lxc_rootfs *rootfs) | |
820 | { | |
821 | char path[MAXPATHLEN]; | |
822 | int ret,i; | |
09227be2 | 823 | struct stat s; |
69aa6655 DE |
824 | |
825 | ||
826 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { | |
827 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
ec50007f | 828 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs->path ? rootfs->mount : "", d->name); |
69aa6655 DE |
829 | if (ret < 0 || ret >= MAXPATHLEN) |
830 | return -1; | |
09227be2 MW |
831 | |
832 | /* | |
833 | * Stat the path first. If we don't get an error | |
834 | * accept it as is and don't try to create it | |
835 | */ | |
836 | if (!stat(path, &s)) { | |
837 | continue; | |
838 | } | |
839 | ||
69aa6655 | 840 | ret = symlink(d->oldpath, path); |
09227be2 | 841 | |
69aa6655 | 842 | if (ret && errno != EEXIST) { |
09227be2 MW |
843 | if ( errno == EROFS ) { |
844 | WARN("Warning: Read Only file system while creating %s", path); | |
845 | } else { | |
846 | SYSERROR("Error creating %s", path); | |
847 | return -1; | |
848 | } | |
69aa6655 DE |
849 | } |
850 | } | |
851 | return 0; | |
852 | } | |
853 | ||
393903d1 SH |
854 | /* |
855 | * Build a space-separate list of ptys to pass to systemd. | |
856 | */ | |
857 | static bool append_ptyname(char **pp, char *name) | |
b0a33c1e | 858 | { |
393903d1 SH |
859 | char *p; |
860 | ||
861 | if (!*pp) { | |
862 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
863 | if (!*pp) | |
864 | return false; | |
865 | sprintf(*pp, "container_ttys=%s", name); | |
866 | return true; | |
867 | } | |
868 | p = realloc(*pp, strlen(*pp) + strlen(name) + 2); | |
869 | if (!p) | |
870 | return false; | |
871 | *pp = p; | |
872 | strcat(p, " "); | |
873 | strcat(p, name); | |
874 | return true; | |
875 | } | |
876 | ||
9e1045e3 | 877 | static int lxc_setup_tty(struct lxc_conf *conf) |
393903d1 | 878 | { |
9e1045e3 | 879 | int i, ret; |
393903d1 SH |
880 | const struct lxc_tty_info *tty_info = &conf->tty_info; |
881 | char *ttydir = conf->ttydir; | |
7c6ef2a2 | 882 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
b0a33c1e | 883 | |
e8bd4e43 | 884 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
885 | return 0; |
886 | ||
b0a33c1e | 887 | for (i = 0; i < tty_info->nbtty; i++) { |
b0a33c1e | 888 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; |
889 | ||
e8bd4e43 | 890 | ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1); |
9e1045e3 | 891 | if (ret < 0 || (size_t)ret >= sizeof(path)) { |
7c6ef2a2 SH |
892 | ERROR("pathname too long for ttys"); |
893 | return -1; | |
894 | } | |
9e1045e3 | 895 | |
7c6ef2a2 SH |
896 | if (ttydir) { |
897 | /* create dev/lxc/tty%d" */ | |
9e1045e3 CB |
898 | ret = snprintf(lxcpath, sizeof(lxcpath), |
899 | "/dev/%s/tty%d", ttydir, i + 1); | |
900 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) { | |
7c6ef2a2 SH |
901 | ERROR("pathname too long for ttys"); |
902 | return -1; | |
903 | } | |
9e1045e3 | 904 | |
7c6ef2a2 | 905 | ret = creat(lxcpath, 0660); |
9e1045e3 CB |
906 | if (ret < 0 && errno != EEXIST) { |
907 | SYSERROR("failed to create \"%s\"", lxcpath); | |
7c6ef2a2 SH |
908 | return -1; |
909 | } | |
4d44e274 SH |
910 | if (ret >= 0) |
911 | close(ret); | |
9e1045e3 | 912 | |
7c6ef2a2 | 913 | ret = unlink(path); |
9e1045e3 CB |
914 | if (ret < 0 && errno != ENOENT) { |
915 | SYSERROR("failed to unlink \"%s\"", path); | |
7c6ef2a2 SH |
916 | return -1; |
917 | } | |
b0a33c1e | 918 | |
9e1045e3 CB |
919 | ret = mount(pty_info->name, lxcpath, "none", MS_BIND, 0); |
920 | if (ret < 0) { | |
921 | WARN("failed to bind mount \"%s\" onto \"%s\"", | |
7c6ef2a2 SH |
922 | pty_info->name, path); |
923 | continue; | |
924 | } | |
9e1045e3 CB |
925 | DEBUG("bind mounted \"%s\" onto \"%s\"", pty_info->name, |
926 | path); | |
13954cce | 927 | |
9e1045e3 CB |
928 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", |
929 | ttydir, i + 1); | |
930 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) { | |
9ba8130c SH |
931 | ERROR("tty pathname too long"); |
932 | return -1; | |
933 | } | |
9e1045e3 | 934 | |
7c6ef2a2 | 935 | ret = symlink(lxcpath, path); |
9e1045e3 CB |
936 | if (ret < 0) { |
937 | SYSERROR("failed to create symlink \"%s\" -> \"%s\"", | |
938 | path, lxcpath); | |
7c6ef2a2 SH |
939 | return -1; |
940 | } | |
941 | } else { | |
9e1045e3 CB |
942 | /* If we populated /dev, then we need to create |
943 | * /dev/ttyN | |
944 | */ | |
945 | ret = access(path, F_OK); | |
946 | if (ret < 0) { | |
c6883f38 | 947 | ret = creat(path, 0660); |
9e1045e3 CB |
948 | if (ret < 0) { |
949 | SYSERROR("failed to create \"%s\"", path); | |
c6883f38 | 950 | /* this isn't fatal, continue */ |
025ed0f3 | 951 | } else { |
c6883f38 | 952 | close(ret); |
025ed0f3 | 953 | } |
c6883f38 | 954 | } |
9e1045e3 CB |
955 | |
956 | ret = mount(pty_info->name, path, "none", MS_BIND, 0); | |
957 | if (ret < 0) { | |
e8bd4e43 | 958 | SYSERROR("failed to mount '%s'->'%s'", pty_info->name, path); |
7c6ef2a2 SH |
959 | continue; |
960 | } | |
9e1045e3 CB |
961 | |
962 | DEBUG("bind mounted \"%s\" onto \"%s\"", pty_info->name, | |
963 | path); | |
393903d1 | 964 | } |
9e1045e3 | 965 | |
e8bd4e43 | 966 | if (!append_ptyname(&conf->pty_names, pty_info->name)) { |
393903d1 SH |
967 | ERROR("Error setting up container_ttys string"); |
968 | return -1; | |
b0a33c1e | 969 | } |
970 | } | |
971 | ||
9e1045e3 | 972 | INFO("finished setting up %d /dev/tty<N> device(s)", tty_info->nbtty); |
b0a33c1e | 973 | return 0; |
974 | } | |
975 | ||
59bb8698 | 976 | static int setup_rootfs_pivot_root(const char *rootfs) |
bf601689 | 977 | { |
2d489f9e | 978 | int oldroot = -1, newroot = -1; |
bf601689 | 979 | |
2d489f9e SH |
980 | oldroot = open("/", O_DIRECTORY | O_RDONLY); |
981 | if (oldroot < 0) { | |
982 | SYSERROR("Error opening old-/ for fchdir"); | |
9ba8130c SH |
983 | return -1; |
984 | } | |
2d489f9e SH |
985 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY); |
986 | if (newroot < 0) { | |
987 | SYSERROR("Error opening new-/ for fchdir"); | |
988 | goto fail; | |
c08556c6 | 989 | } |
bf601689 | 990 | |
cc6f6dd7 | 991 | /* change into new root fs */ |
2d489f9e | 992 | if (fchdir(newroot)) { |
cc6f6dd7 | 993 | SYSERROR("can't chdir to new rootfs '%s'", rootfs); |
2d489f9e | 994 | goto fail; |
cc6f6dd7 DL |
995 | } |
996 | ||
cc6f6dd7 | 997 | /* pivot_root into our new root fs */ |
2d489f9e | 998 | if (pivot_root(".", ".")) { |
cc6f6dd7 | 999 | SYSERROR("pivot_root syscall failed"); |
2d489f9e | 1000 | goto fail; |
bf601689 | 1001 | } |
cc6f6dd7 | 1002 | |
2d489f9e SH |
1003 | /* |
1004 | * at this point the old-root is mounted on top of our new-root | |
1005 | * To unmounted it we must not be chdir'd into it, so escape back | |
1006 | * to old-root | |
1007 | */ | |
1008 | if (fchdir(oldroot) < 0) { | |
1009 | SYSERROR("Error entering oldroot"); | |
1010 | goto fail; | |
1011 | } | |
7981ea46 | 1012 | if (umount2(".", MNT_DETACH) < 0) { |
2d489f9e SH |
1013 | SYSERROR("Error detaching old root"); |
1014 | goto fail; | |
cc6f6dd7 DL |
1015 | } |
1016 | ||
2d489f9e SH |
1017 | if (fchdir(newroot) < 0) { |
1018 | SYSERROR("Error re-entering newroot"); | |
1019 | goto fail; | |
1020 | } | |
cc6f6dd7 | 1021 | |
2d489f9e SH |
1022 | close(oldroot); |
1023 | close(newroot); | |
bf601689 | 1024 | |
2d489f9e | 1025 | DEBUG("pivot_root syscall to '%s' successful", rootfs); |
bf601689 | 1026 | |
bf601689 | 1027 | return 0; |
2d489f9e SH |
1028 | |
1029 | fail: | |
1030 | if (oldroot != -1) | |
1031 | close(oldroot); | |
1032 | if (newroot != -1) | |
1033 | close(newroot); | |
1034 | return -1; | |
bf601689 MH |
1035 | } |
1036 | ||
bc6928ff | 1037 | /* |
87da4ec3 SH |
1038 | * Just create a path for /dev under $lxcpath/$name and in rootfs |
1039 | * If we hit an error, log it but don't fail yet. | |
91c3830e | 1040 | */ |
14221cbb | 1041 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, const char *lxcpath) |
91c3830e SH |
1042 | { |
1043 | int ret; | |
87da4ec3 SH |
1044 | size_t clen; |
1045 | char *path; | |
91c3830e | 1046 | |
14221cbb | 1047 | INFO("Mounting container /dev"); |
bc6928ff | 1048 | |
14221cbb | 1049 | /* $(rootfs->mount) + "/dev/pts" + '\0' */ |
ec50007f | 1050 | clen = (rootfs->path ? strlen(rootfs->mount) : 0) + 9; |
87da4ec3 | 1051 | path = alloca(clen); |
bc6928ff | 1052 | |
ec50007f | 1053 | ret = snprintf(path, clen, "%s/dev", rootfs->path ? rootfs->mount : ""); |
87da4ec3 | 1054 | if (ret < 0 || ret >= clen) |
91c3830e | 1055 | return -1; |
bc6928ff | 1056 | |
87da4ec3 | 1057 | if (!dir_exists(path)) { |
14221cbb | 1058 | WARN("No /dev in container."); |
87da4ec3 SH |
1059 | WARN("Proceeding without autodev setup"); |
1060 | return 0; | |
bc6928ff | 1061 | } |
87da4ec3 | 1062 | |
1ec0e8e3 | 1063 | ret = safe_mount("none", path, "tmpfs", 0, "size=500000,mode=755", |
ec50007f | 1064 | rootfs->path ? rootfs->mount : NULL); |
1ec0e8e3 | 1065 | if (ret != 0) { |
87da4ec3 | 1066 | SYSERROR("Failed mounting tmpfs onto %s\n", path); |
1ec0e8e3 | 1067 | return -1; |
91c3830e | 1068 | } |
87da4ec3 SH |
1069 | |
1070 | INFO("Mounted tmpfs onto %s", path); | |
1071 | ||
ec50007f | 1072 | ret = snprintf(path, clen, "%s/dev/pts", rootfs->path ? rootfs->mount : ""); |
87da4ec3 | 1073 | if (ret < 0 || ret >= clen) |
91c3830e | 1074 | return -1; |
87da4ec3 | 1075 | |
bc6928ff MW |
1076 | /* |
1077 | * If we are running on a devtmpfs mapping, dev/pts may already exist. | |
1078 | * If not, then create it and exit if that fails... | |
1079 | */ | |
87da4ec3 | 1080 | if (!dir_exists(path)) { |
bc6928ff MW |
1081 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
1082 | if (ret) { | |
1083 | SYSERROR("Failed to create /dev/pts in container"); | |
1084 | return -1; | |
1085 | } | |
91c3830e SH |
1086 | } |
1087 | ||
14221cbb | 1088 | INFO("Mounted container /dev"); |
91c3830e SH |
1089 | return 0; |
1090 | } | |
1091 | ||
c6883f38 | 1092 | struct lxc_devs { |
74a3920a | 1093 | const char *name; |
c6883f38 SH |
1094 | mode_t mode; |
1095 | int maj; | |
1096 | int min; | |
1097 | }; | |
1098 | ||
74a3920a | 1099 | static const struct lxc_devs lxc_devs[] = { |
c6883f38 SH |
1100 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
1101 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
1102 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, | |
1103 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, | |
1104 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, | |
1105 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
c6883f38 SH |
1106 | }; |
1107 | ||
27245ff7 | 1108 | static int lxc_fill_autodev(const struct lxc_rootfs *rootfs) |
c6883f38 SH |
1109 | { |
1110 | int ret; | |
c6883f38 SH |
1111 | char path[MAXPATHLEN]; |
1112 | int i; | |
3a32201c | 1113 | mode_t cmask; |
c6883f38 | 1114 | |
ec50007f | 1115 | ret = snprintf(path, MAXPATHLEN, "%s/dev", rootfs->path ? rootfs->mount : ""); |
91c3830e SH |
1116 | if (ret < 0 || ret >= MAXPATHLEN) { |
1117 | ERROR("Error calculating container /dev location"); | |
c6883f38 | 1118 | return -1; |
f7bee6c6 | 1119 | } |
91c3830e | 1120 | |
0bbf8572 CB |
1121 | /* ignore, just don't try to fill in */ |
1122 | if (!dir_exists(path)) | |
9cb4d183 SH |
1123 | return 0; |
1124 | ||
0bbf8572 | 1125 | INFO("populating container /dev"); |
3a32201c | 1126 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
c6883f38 | 1127 | for (i = 0; i < sizeof(lxc_devs) / sizeof(lxc_devs[0]); i++) { |
74a3920a | 1128 | const struct lxc_devs *d = &lxc_devs[i]; |
0728ebf4 | 1129 | |
ec50007f | 1130 | ret = snprintf(path, MAXPATHLEN, "%s/dev/%s", rootfs->path ? rootfs->mount : "", d->name); |
c6883f38 SH |
1131 | if (ret < 0 || ret >= MAXPATHLEN) |
1132 | return -1; | |
0bbf8572 | 1133 | |
c6883f38 | 1134 | ret = mknod(path, d->mode, makedev(d->maj, d->min)); |
0bbf8572 | 1135 | if (ret < 0) { |
9cb4d183 SH |
1136 | char hostpath[MAXPATHLEN]; |
1137 | FILE *pathfile; | |
1138 | ||
0bbf8572 CB |
1139 | if (errno == EEXIST) { |
1140 | DEBUG("\"%s\" device already existed", path); | |
1141 | continue; | |
1142 | } | |
1143 | ||
1144 | /* Unprivileged containers cannot create devices, so | |
1145 | * bind mount the device from the host. | |
1146 | */ | |
9cb4d183 SH |
1147 | ret = snprintf(hostpath, MAXPATHLEN, "/dev/%s", d->name); |
1148 | if (ret < 0 || ret >= MAXPATHLEN) | |
1149 | return -1; | |
1150 | pathfile = fopen(path, "wb"); | |
1151 | if (!pathfile) { | |
1152 | SYSERROR("Failed to create device mount target '%s'", path); | |
1153 | return -1; | |
1154 | } | |
1155 | fclose(pathfile); | |
0bbf8572 CB |
1156 | if (safe_mount(hostpath, path, 0, MS_BIND, NULL, rootfs->path ? rootfs->mount : NULL) != 0) { |
1157 | SYSERROR("Failed bind mounting device %s from host into container", d->name); | |
9cb4d183 SH |
1158 | return -1; |
1159 | } | |
0bbf8572 CB |
1160 | DEBUG("bind mounted \"%s\" onto \"%s\"", hostpath, path); |
1161 | } else { | |
1162 | DEBUG("created device node \"%s\"", path); | |
c6883f38 SH |
1163 | } |
1164 | } | |
3a32201c | 1165 | umask(cmask); |
c6883f38 | 1166 | |
0bbf8572 | 1167 | INFO("populated container /dev"); |
c6883f38 SH |
1168 | return 0; |
1169 | } | |
1170 | ||
9aa76a17 | 1171 | static int lxc_setup_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1172 | { |
9aa76a17 | 1173 | int ret; |
91c3e281 CB |
1174 | struct bdev *bdev; |
1175 | const struct lxc_rootfs *rootfs; | |
cc28d0b0 | 1176 | |
91c3e281 | 1177 | rootfs = &conf->rootfs; |
a0f379bf | 1178 | if (!rootfs->path) { |
91c3e281 CB |
1179 | if (mount("", "/", NULL, MS_SLAVE | MS_REC, 0)) { |
1180 | SYSERROR("Failed to make / rslave."); | |
a0f379bf DW |
1181 | return -1; |
1182 | } | |
c69bd12f | 1183 | return 0; |
a0f379bf | 1184 | } |
0ad19a3f | 1185 | |
12297168 | 1186 | if (access(rootfs->mount, F_OK)) { |
91c3e281 | 1187 | SYSERROR("Failed to access to \"%s\". Check it is present.", |
12297168 | 1188 | rootfs->mount); |
b1789442 DL |
1189 | return -1; |
1190 | } | |
1191 | ||
91c3e281 | 1192 | bdev = bdev_init(conf, rootfs->path, rootfs->mount, rootfs->options); |
9aa76a17 CB |
1193 | if (!bdev) { |
1194 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\".", | |
91c3e281 CB |
1195 | rootfs->path, rootfs->mount, |
1196 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1197 | return -1; |
9be53773 | 1198 | } |
9aa76a17 CB |
1199 | |
1200 | ret = bdev->ops->mount(bdev); | |
1201 | bdev_put(bdev); | |
1202 | if (ret < 0) { | |
91c3e281 CB |
1203 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\".", |
1204 | rootfs->path, rootfs->mount, | |
1205 | rootfs->options ? rootfs->options : "(null)"); | |
c3f0a28c | 1206 | return -1; |
1207 | } | |
0ad19a3f | 1208 | |
91c3e281 CB |
1209 | DEBUG("Mounted rootfs \"%s\" onto \"%s\" with options \"%s\".", |
1210 | rootfs->path, rootfs->mount, | |
1211 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1212 | |
ac778708 DL |
1213 | return 0; |
1214 | } | |
1215 | ||
91e93c71 AV |
1216 | int prepare_ramfs_root(char *root) |
1217 | { | |
eab15c1e | 1218 | char buf[LXC_LINELEN], *p; |
91e93c71 AV |
1219 | char nroot[PATH_MAX]; |
1220 | FILE *f; | |
1221 | int i; | |
1222 | char *p2; | |
1223 | ||
1224 | if (realpath(root, nroot) == NULL) | |
39c7b795 | 1225 | return -errno; |
91e93c71 AV |
1226 | |
1227 | if (chdir("/") == -1) | |
39c7b795 | 1228 | return -errno; |
91e93c71 AV |
1229 | |
1230 | /* | |
1231 | * We could use here MS_MOVE, but in userns this mount is | |
1232 | * locked and can't be moved. | |
1233 | */ | |
39c7b795 | 1234 | if (mount(root, "/", NULL, MS_REC | MS_BIND, NULL) < 0) { |
91e93c71 | 1235 | SYSERROR("Failed to move %s into /", root); |
39c7b795 | 1236 | return -errno; |
91e93c71 AV |
1237 | } |
1238 | ||
39c7b795 | 1239 | if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL) < 0) { |
91e93c71 | 1240 | SYSERROR("Failed to make . rprivate"); |
39c7b795 | 1241 | return -errno; |
91e93c71 AV |
1242 | } |
1243 | ||
1244 | /* | |
1245 | * The following code cleans up inhereted mounts which are not | |
1246 | * required for CT. | |
1247 | * | |
1248 | * The mountinfo file shows not all mounts, if a few points have been | |
1249 | * unmounted between read operations from the mountinfo. So we need to | |
1250 | * read mountinfo a few times. | |
1251 | * | |
1252 | * This loop can be skipped if a container uses unserns, because all | |
1253 | * inherited mounts are locked and we should live with all this trash. | |
1254 | */ | |
1255 | while (1) { | |
1256 | int progress = 0; | |
1257 | ||
1258 | f = fopen("./proc/self/mountinfo", "r"); | |
1259 | if (!f) { | |
1260 | SYSERROR("Unable to open /proc/self/mountinfo"); | |
1261 | return -1; | |
1262 | } | |
eab15c1e | 1263 | while (fgets(buf, LXC_LINELEN, f)) { |
91e93c71 AV |
1264 | for (p = buf, i=0; p && i < 4; i++) |
1265 | p = strchr(p+1, ' '); | |
1266 | if (!p) | |
1267 | continue; | |
1268 | p2 = strchr(p+1, ' '); | |
1269 | if (!p2) | |
1270 | continue; | |
1271 | ||
1272 | *p2 = '\0'; | |
1273 | *p = '.'; | |
1274 | ||
1275 | if (strcmp(p + 1, "/") == 0) | |
1276 | continue; | |
1277 | if (strcmp(p + 1, "/proc") == 0) | |
1278 | continue; | |
1279 | ||
1280 | if (umount2(p, MNT_DETACH) == 0) | |
1281 | progress++; | |
1282 | } | |
1283 | fclose(f); | |
1284 | if (!progress) | |
1285 | break; | |
1286 | } | |
1287 | ||
8bea9fae PR |
1288 | /* This also can be skipped if a container uses unserns */ |
1289 | umount2("./proc", MNT_DETACH); | |
91e93c71 AV |
1290 | |
1291 | /* It is weird, but chdir("..") moves us in a new root */ | |
1292 | if (chdir("..") == -1) { | |
1293 | SYSERROR("Unable to change working directory"); | |
1294 | return -1; | |
1295 | } | |
1296 | ||
1297 | if (chroot(".") == -1) { | |
1298 | SYSERROR("Unable to chroot"); | |
1299 | return -1; | |
1300 | } | |
1301 | ||
1302 | return 0; | |
1303 | } | |
1304 | ||
74a3920a | 1305 | static int setup_pivot_root(const struct lxc_rootfs *rootfs) |
ac778708 | 1306 | { |
39c7b795 CB |
1307 | if (!rootfs->path) { |
1308 | DEBUG("container does not have a rootfs, so not doing pivot root"); | |
ac778708 | 1309 | return 0; |
39c7b795 | 1310 | } |
ac778708 | 1311 | |
91e93c71 | 1312 | if (detect_ramfs_rootfs()) { |
39c7b795 CB |
1313 | DEBUG("detected that container is on ramfs"); |
1314 | if (prepare_ramfs_root(rootfs->mount)) { | |
1315 | ERROR("failed to prepare minimal ramfs root"); | |
91e93c71 | 1316 | return -1; |
39c7b795 CB |
1317 | } |
1318 | ||
1319 | DEBUG("prepared ramfs root for container"); | |
1320 | return 0; | |
1321 | } | |
1322 | ||
1323 | if (setup_rootfs_pivot_root(rootfs->mount) < 0) { | |
1324 | ERROR("failed to pivot root"); | |
25368b52 | 1325 | return -1; |
c69bd12f DL |
1326 | } |
1327 | ||
39c7b795 | 1328 | DEBUG("finished pivot root"); |
25368b52 | 1329 | return 0; |
0ad19a3f | 1330 | } |
1331 | ||
70761e5e | 1332 | static int lxc_setup_devpts(int num_pts) |
3c26f34e | 1333 | { |
70761e5e | 1334 | int ret; |
d5cb35d6 | 1335 | const char *devpts_mntopts = "newinstance,ptmxmode=0666,mode=0620,gid=5"; |
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 | ||
d5cb35d6 | 1343 | /* Unmount old devpts instance. */ |
70761e5e CB |
1344 | ret = access("/dev/pts/ptmx", F_OK); |
1345 | if (!ret) { | |
70761e5e CB |
1346 | ret = umount("/dev/pts"); |
1347 | if (ret < 0) { | |
1348 | SYSERROR("failed to unmount old devpts instance"); | |
1349 | return -1; | |
7e40254a | 1350 | } |
70761e5e | 1351 | DEBUG("unmounted old /dev/pts instance"); |
7e40254a JTLB |
1352 | } |
1353 | ||
70761e5e CB |
1354 | /* Create mountpoint for devpts instance. */ |
1355 | ret = mkdir("/dev/pts", 0755); | |
1356 | if (ret < 0 && errno != EEXIST) { | |
1357 | SYSERROR("failed to create the \"/dev/pts\" directory"); | |
3c26f34e | 1358 | return -1; |
1359 | } | |
1360 | ||
70761e5e CB |
1361 | /* Mount new devpts instance. */ |
1362 | ret = mount("devpts", "/dev/pts", "devpts", MS_MGC_VAL, devpts_mntopts); | |
1363 | if (ret < 0) { | |
1364 | SYSERROR("failed to mount new devpts instance"); | |
1365 | return -1; | |
1366 | } | |
f4f52cb5 | 1367 | DEBUG("mount new devpts instance with options \"%s\"", devpts_mntopts); |
70761e5e | 1368 | |
d5cb35d6 | 1369 | /* Remove any pre-existing /dev/ptmx file. */ |
70761e5e | 1370 | ret = access("/dev/ptmx", F_OK); |
d5cb35d6 CB |
1371 | if (!ret) { |
1372 | ret = remove("/dev/ptmx"); | |
1373 | if (ret < 0) { | |
1374 | SYSERROR("failed to remove existing \"/dev/ptmx\""); | |
1375 | return -1; | |
70761e5e | 1376 | } |
d5cb35d6 | 1377 | DEBUG("removed existing \"/dev/ptmx\""); |
3c26f34e | 1378 | } |
1379 | ||
d5cb35d6 CB |
1380 | /* Create dummy /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
1381 | ret = open("/dev/ptmx", O_CREAT, 0666); | |
1382 | if (ret < 0) { | |
1383 | SYSERROR("failed to create dummy \"/dev/ptmx\" file as bind mount target"); | |
1384 | return -1; | |
1385 | } | |
e87bd19c | 1386 | close(ret); |
d5cb35d6 | 1387 | DEBUG("created dummy \"/dev/ptmx\" file as bind mount target"); |
77890c6d | 1388 | |
d5cb35d6 | 1389 | /* Fallback option: create symlink /dev/ptmx -> /dev/pts/ptmx */ |
e87bd19c | 1390 | ret = mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL); |
d5cb35d6 CB |
1391 | if (!ret) { |
1392 | DEBUG("bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); | |
1393 | return 0; | |
1394 | } else { | |
1395 | /* Fallthrough and try to create a symlink. */ | |
1396 | ERROR("failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); | |
1397 | } | |
1398 | ||
1399 | /* Remove the dummy /dev/ptmx file we created above. */ | |
1400 | ret = remove("/dev/ptmx"); | |
70761e5e | 1401 | if (ret < 0) { |
d5cb35d6 CB |
1402 | SYSERROR("failed to remove existing \"/dev/ptmx\""); |
1403 | return -1; | |
1404 | } | |
1405 | ||
1406 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
1407 | ret = symlink("/dev/pts/ptmx", "/dev/ptmx"); | |
1408 | if (ret < 0) { | |
1409 | SYSERROR("failed to create symlink \"/dev/ptmx\" -> \"/dev/pts/ptmx\""); | |
3c26f34e | 1410 | return -1; |
1411 | } | |
d5cb35d6 | 1412 | DEBUG("created symlink \"/dev/ptmx\" -> \"/dev/pts/ptmx\""); |
cd54d859 | 1413 | |
3c26f34e | 1414 | return 0; |
1415 | } | |
1416 | ||
cccc74b5 DL |
1417 | static int setup_personality(int persona) |
1418 | { | |
6ff05e18 | 1419 | #if HAVE_SYS_PERSONALITY_H |
cccc74b5 DL |
1420 | if (persona == -1) |
1421 | return 0; | |
1422 | ||
1423 | if (personality(persona) < 0) { | |
1424 | SYSERROR("failed to set personality to '0x%x'", persona); | |
1425 | return -1; | |
1426 | } | |
1427 | ||
1428 | INFO("set personality to '0x%x'", persona); | |
6ff05e18 | 1429 | #endif |
cccc74b5 DL |
1430 | |
1431 | return 0; | |
1432 | } | |
1433 | ||
3d7d929a CB |
1434 | static int lxc_setup_dev_console(const struct lxc_rootfs *rootfs, |
1435 | const struct lxc_console *console) | |
6e590161 | 1436 | { |
63376d7d | 1437 | char path[MAXPATHLEN]; |
0728ebf4 | 1438 | int ret, fd; |
52e35957 | 1439 | |
8b1b1210 CB |
1440 | if (console->path && !strcmp(console->path, "none")) |
1441 | return 0; | |
1442 | ||
7c6ef2a2 | 1443 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); |
3d7d929a | 1444 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1445 | return -1; |
52e35957 | 1446 | |
8b1b1210 CB |
1447 | /* When we are asked to setup a console we remove any previous |
1448 | * /dev/console bind-mounts. | |
1449 | */ | |
a7ba3c7f CB |
1450 | if (file_exists(path)) { |
1451 | ret = lxc_unstack_mountpoint(path, false); | |
1452 | if (ret < 0) { | |
8b1b1210 | 1453 | ERROR("failed to unmount \"%s\": %s", path, strerror(errno)); |
a7ba3c7f CB |
1454 | return -ret; |
1455 | } else { | |
1456 | DEBUG("cleared all (%d) mounts from \"%s\"", ret, path); | |
1457 | } | |
953fe44f | 1458 | |
a7ba3c7f CB |
1459 | ret = unlink(path); |
1460 | if (ret < 0) { | |
1461 | SYSERROR("error unlinking %s", path); | |
8b1b1210 CB |
1462 | return -errno; |
1463 | } | |
8b1b1210 CB |
1464 | } |
1465 | ||
1466 | /* For unprivileged containers autodev or automounts will already have | |
1467 | * taken care of creating /dev/console. | |
1468 | */ | |
0728ebf4 TA |
1469 | fd = open(path, O_CREAT | O_EXCL, S_IXUSR | S_IXGRP | S_IXOTH); |
1470 | if (fd < 0) { | |
1471 | if (errno != EEXIST) { | |
1472 | SYSERROR("failed to create console"); | |
3d7d929a | 1473 | return -errno; |
0728ebf4 TA |
1474 | } |
1475 | } else { | |
1476 | close(fd); | |
52e35957 DL |
1477 | } |
1478 | ||
0728ebf4 | 1479 | if (chmod(console->name, S_IXUSR | S_IXGRP | S_IXOTH)) { |
3d7d929a CB |
1480 | SYSERROR("failed to set mode '0%o' to '%s'", S_IXUSR | S_IXGRP | S_IXOTH, console->name); |
1481 | return -errno; | |
63376d7d | 1482 | } |
13954cce | 1483 | |
3d7d929a | 1484 | if (safe_mount(console->name, path, "none", MS_BIND, 0, rootfs->mount) < 0) { |
63376d7d | 1485 | ERROR("failed to mount '%s' on '%s'", console->name, path); |
6e590161 | 1486 | return -1; |
1487 | } | |
1488 | ||
3d7d929a | 1489 | DEBUG("mounted pts device \"%s\" onto \"%s\"", console->name, path); |
7c6ef2a2 SH |
1490 | return 0; |
1491 | } | |
1492 | ||
3d7d929a CB |
1493 | static int lxc_setup_ttydir_console(const struct lxc_rootfs *rootfs, |
1494 | const struct lxc_console *console, | |
1495 | char *ttydir) | |
7c6ef2a2 | 1496 | { |
7c6ef2a2 | 1497 | int ret; |
3d7d929a | 1498 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
7c6ef2a2 SH |
1499 | |
1500 | /* create rootfs/dev/<ttydir> directory */ | |
3d7d929a CB |
1501 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs->mount, ttydir); |
1502 | if (ret < 0 || (size_t)ret >= sizeof(path)) | |
7c6ef2a2 | 1503 | return -1; |
3d7d929a | 1504 | |
7c6ef2a2 SH |
1505 | ret = mkdir(path, 0755); |
1506 | if (ret && errno != EEXIST) { | |
959aee9c | 1507 | SYSERROR("failed with errno %d to create %s", errno, path); |
3d7d929a | 1508 | return -errno; |
7c6ef2a2 | 1509 | } |
3d7d929a | 1510 | DEBUG("created directory for console and tty devices at \%s\"", path); |
7c6ef2a2 | 1511 | |
3d7d929a CB |
1512 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", rootfs->mount, ttydir); |
1513 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) | |
1514 | return -1; | |
1515 | ||
7c6ef2a2 | 1516 | ret = creat(lxcpath, 0660); |
3d7d929a | 1517 | if (ret == -1 && errno != EEXIST) { |
959aee9c | 1518 | SYSERROR("error %d creating %s", errno, lxcpath); |
3d7d929a | 1519 | return -errno; |
7c6ef2a2 | 1520 | } |
4d44e274 SH |
1521 | if (ret >= 0) |
1522 | close(ret); | |
7c6ef2a2 | 1523 | |
2a12fefd CB |
1524 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); |
1525 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) | |
7c6ef2a2 | 1526 | return -1; |
2a12fefd CB |
1527 | |
1528 | /* When we are asked to setup a console we remove any previous | |
1529 | * /dev/console bind-mounts. | |
1530 | */ | |
1531 | if (console->path && !strcmp(console->path, "none")) { | |
1532 | struct stat st; | |
1533 | ret = stat(path, &st); | |
1534 | if (ret < 0) { | |
1535 | if (errno == ENOENT) | |
1536 | return 0; | |
1537 | SYSERROR("failed stat() \"%s\"", path); | |
1538 | return -errno; | |
1539 | } | |
1540 | ||
1541 | /* /dev/console must be character device with major number 5 and | |
1542 | * minor number 1. If not, give benefit of the doubt and assume | |
1543 | * the user has mounted something else right there on purpose. | |
1544 | */ | |
1545 | if (((st.st_mode & S_IFMT) != S_IFCHR) || major(st.st_rdev) != 5 || minor(st.st_rdev) != 1) | |
1546 | return 0; | |
1547 | ||
1548 | /* In case the user requested a bind-mount for /dev/console and | |
1549 | * requests a ttydir we move the mount to the | |
a7ba3c7f CB |
1550 | * /dev/<ttydir/console. |
1551 | * Note, we only move the uppermost mount and clear all other | |
1552 | * mounts underneath for safety. | |
1553 | * If it is a character device created via mknod() we simply | |
1554 | * rename it. | |
2a12fefd CB |
1555 | */ |
1556 | ret = safe_mount(path, lxcpath, "none", MS_MOVE, NULL, rootfs->mount); | |
1557 | if (ret < 0) { | |
1558 | if (errno != EINVAL) { | |
1559 | ERROR("failed to MS_MOVE \"%s\" to \"%s\": %s", path, lxcpath, strerror(errno)); | |
1560 | return -errno; | |
1561 | } | |
1562 | /* path was not a mountpoint */ | |
1563 | ret = rename(path, lxcpath); | |
1564 | if (ret < 0) { | |
1565 | ERROR("failed to rename \"%s\" to \"%s\": %s", path, lxcpath, strerror(errno)); | |
1566 | return -errno; | |
1567 | } | |
1568 | DEBUG("renamed \"%s\" to \"%s\"", path, lxcpath); | |
1569 | } else { | |
1570 | DEBUG("moved mount \"%s\" to \"%s\"", path, lxcpath); | |
1571 | } | |
a7ba3c7f CB |
1572 | |
1573 | /* Clear all remaining bind-mounts. */ | |
1574 | ret = lxc_unstack_mountpoint(path, false); | |
2a12fefd | 1575 | if (ret < 0) { |
a7ba3c7f CB |
1576 | ERROR("failed to unmount \"%s\": %s", path, strerror(errno)); |
1577 | return -ret; | |
1578 | } else { | |
1579 | DEBUG("cleared all (%d) mounts from \"%s\"", ret, path); | |
1580 | } | |
1581 | } else { | |
1582 | if (file_exists(path)) { | |
1583 | ret = lxc_unstack_mountpoint(path, false); | |
1584 | if (ret < 0) { | |
2a12fefd | 1585 | ERROR("failed to unmount \"%s\": %s", path, strerror(errno)); |
a7ba3c7f CB |
1586 | return -ret; |
1587 | } else { | |
1588 | DEBUG("cleared all (%d) mounts from \"%s\"", ret, path); | |
2a12fefd | 1589 | } |
2a12fefd CB |
1590 | } |
1591 | ||
1592 | if (safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs->mount) < 0) { | |
1593 | ERROR("failed to mount '%s' on '%s'", console->name, lxcpath); | |
1594 | return -1; | |
1595 | } | |
1596 | DEBUG("mounted \"%s\" onto \"%s\"", console->name, lxcpath); | |
7c6ef2a2 SH |
1597 | } |
1598 | ||
2a12fefd | 1599 | /* create symlink from rootfs /dev/console to '<ttydir>/console' */ |
9ba8130c | 1600 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/console", ttydir); |
3d7d929a | 1601 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
9ba8130c | 1602 | return -1; |
3d7d929a | 1603 | |
2a12fefd CB |
1604 | ret = unlink(path); |
1605 | if (ret && errno != ENOENT) { | |
1606 | SYSERROR("error unlinking %s", path); | |
1607 | return -errno; | |
1608 | } | |
1609 | ||
7c6ef2a2 | 1610 | ret = symlink(lxcpath, path); |
3d7d929a CB |
1611 | if (ret < 0) { |
1612 | SYSERROR("failed to create symlink for console from \"%s\" to \"%s\"", lxcpath, path); | |
7c6ef2a2 SH |
1613 | return -1; |
1614 | } | |
1615 | ||
3d7d929a | 1616 | DEBUG("console has been setup under \"%s\" and symlinked to \"%s\"", lxcpath, path); |
6e590161 | 1617 | return 0; |
1618 | } | |
1619 | ||
3d7d929a CB |
1620 | static int lxc_setup_console(const struct lxc_rootfs *rootfs, |
1621 | const struct lxc_console *console, char *ttydir) | |
7c6ef2a2 | 1622 | { |
3d7d929a CB |
1623 | /* We don't have a rootfs, /dev/console will be shared. */ |
1624 | if (!rootfs->path) { | |
1625 | DEBUG("/dev/console will be shared with the host"); | |
7c6ef2a2 | 1626 | return 0; |
3d7d929a CB |
1627 | } |
1628 | ||
7c6ef2a2 | 1629 | if (!ttydir) |
3d7d929a | 1630 | return lxc_setup_dev_console(rootfs, console); |
7c6ef2a2 | 1631 | |
3d7d929a | 1632 | return lxc_setup_ttydir_console(rootfs, console, ttydir); |
7c6ef2a2 SH |
1633 | } |
1634 | ||
998ac676 RT |
1635 | static void parse_mntopt(char *opt, unsigned long *flags, char **data) |
1636 | { | |
1637 | struct mount_opt *mo; | |
1638 | ||
1639 | /* If opt is found in mount_opt, set or clear flags. | |
1640 | * Otherwise append it to data. */ | |
1641 | ||
1642 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
1643 | if (!strncmp(opt, mo->name, strlen(mo->name))) { | |
1644 | if (mo->clear) | |
1645 | *flags &= ~mo->flag; | |
1646 | else | |
1647 | *flags |= mo->flag; | |
1648 | return; | |
1649 | } | |
1650 | } | |
1651 | ||
1652 | if (strlen(*data)) | |
1653 | strcat(*data, ","); | |
1654 | strcat(*data, opt); | |
1655 | } | |
1656 | ||
a17b1e65 | 1657 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, |
998ac676 RT |
1658 | char **mntdata) |
1659 | { | |
1660 | char *s, *data; | |
1661 | char *p, *saveptr = NULL; | |
1662 | ||
911324ef | 1663 | *mntdata = NULL; |
91656ce5 | 1664 | *mntflags = 0L; |
911324ef DL |
1665 | |
1666 | if (!mntopts) | |
998ac676 RT |
1667 | return 0; |
1668 | ||
911324ef | 1669 | s = strdup(mntopts); |
998ac676 | 1670 | if (!s) { |
36eb9bde | 1671 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1672 | return -1; |
1673 | } | |
1674 | ||
1675 | data = malloc(strlen(s) + 1); | |
1676 | if (!data) { | |
36eb9bde | 1677 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1678 | free(s); |
1679 | return -1; | |
1680 | } | |
1681 | *data = 0; | |
1682 | ||
1683 | for (p = strtok_r(s, ",", &saveptr); p != NULL; | |
1684 | p = strtok_r(NULL, ",", &saveptr)) | |
1685 | parse_mntopt(p, mntflags, &data); | |
1686 | ||
1687 | if (*data) | |
1688 | *mntdata = data; | |
1689 | else | |
1690 | free(data); | |
1691 | free(s); | |
1692 | ||
1693 | return 0; | |
1694 | } | |
1695 | ||
6fd5e769 SH |
1696 | static void null_endofword(char *word) |
1697 | { | |
1698 | while (*word && *word != ' ' && *word != '\t') | |
1699 | word++; | |
1700 | *word = '\0'; | |
1701 | } | |
1702 | ||
1703 | /* | |
1704 | * skip @nfields spaces in @src | |
1705 | */ | |
1706 | static char *get_field(char *src, int nfields) | |
1707 | { | |
1708 | char *p = src; | |
1709 | int i; | |
1710 | ||
1711 | for (i = 0; i < nfields; i++) { | |
1712 | while (*p && *p != ' ' && *p != '\t') | |
1713 | p++; | |
1714 | if (!*p) | |
1715 | break; | |
1716 | p++; | |
1717 | } | |
1718 | return p; | |
1719 | } | |
1720 | ||
911324ef DL |
1721 | static int mount_entry(const char *fsname, const char *target, |
1722 | const char *fstype, unsigned long mountflags, | |
ae7a770e | 1723 | const char *data, int optional, int dev, const char *rootfs) |
911324ef | 1724 | { |
614305f3 | 1725 | #ifdef HAVE_STATVFS |
2938f7c8 | 1726 | struct statvfs sb; |
614305f3 | 1727 | #endif |
2938f7c8 | 1728 | |
592fd47a | 1729 | if (safe_mount(fsname, target, fstype, mountflags & ~MS_REMOUNT, data, rootfs)) { |
1fc64d22 SG |
1730 | if (optional) { |
1731 | INFO("failed to mount '%s' on '%s' (optional): %s", fsname, | |
1732 | target, strerror(errno)); | |
1733 | return 0; | |
1734 | } | |
1735 | else { | |
1736 | SYSERROR("failed to mount '%s' on '%s'", fsname, target); | |
1737 | return -1; | |
1738 | } | |
911324ef DL |
1739 | } |
1740 | ||
1741 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
2938f7c8 SH |
1742 | DEBUG("remounting %s on %s to respect bind or remount options", |
1743 | fsname ? fsname : "(none)", target ? target : "(none)"); | |
7c5b6e7c AS |
1744 | unsigned long rqd_flags = 0; |
1745 | if (mountflags & MS_RDONLY) | |
1746 | rqd_flags |= MS_RDONLY; | |
614305f3 | 1747 | #ifdef HAVE_STATVFS |
2938f7c8 | 1748 | if (statvfs(fsname, &sb) == 0) { |
7c5b6e7c | 1749 | unsigned long required_flags = rqd_flags; |
2938f7c8 SH |
1750 | if (sb.f_flag & MS_NOSUID) |
1751 | required_flags |= MS_NOSUID; | |
ae7a770e | 1752 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 SH |
1753 | required_flags |= MS_NODEV; |
1754 | if (sb.f_flag & MS_RDONLY) | |
1755 | required_flags |= MS_RDONLY; | |
1756 | if (sb.f_flag & MS_NOEXEC) | |
1757 | required_flags |= MS_NOEXEC; | |
1758 | DEBUG("(at remount) flags for %s was %lu, required extra flags are %lu", fsname, sb.f_flag, required_flags); | |
1759 | /* | |
1760 | * If this was a bind mount request, and required_flags | |
1761 | * does not have any flags which are not already in | |
1762 | * mountflags, then skip the remount | |
1763 | */ | |
1764 | if (!(mountflags & MS_REMOUNT)) { | |
7c5b6e7c | 1765 | if (!(required_flags & ~mountflags) && rqd_flags == 0) { |
2938f7c8 SH |
1766 | DEBUG("mountflags already was %lu, skipping remount", |
1767 | mountflags); | |
1768 | goto skipremount; | |
1769 | } | |
1770 | } | |
1771 | mountflags |= required_flags; | |
6fd5e769 | 1772 | } |
614305f3 | 1773 | #endif |
911324ef DL |
1774 | |
1775 | if (mount(fsname, target, fstype, | |
592fd47a | 1776 | mountflags | MS_REMOUNT, data) < 0) { |
1fc64d22 SG |
1777 | if (optional) { |
1778 | INFO("failed to mount '%s' on '%s' (optional): %s", | |
1779 | fsname, target, strerror(errno)); | |
1780 | return 0; | |
1781 | } | |
1782 | else { | |
1783 | SYSERROR("failed to mount '%s' on '%s'", | |
1784 | fsname, target); | |
1785 | return -1; | |
1786 | } | |
911324ef DL |
1787 | } |
1788 | } | |
1789 | ||
614305f3 | 1790 | #ifdef HAVE_STATVFS |
6fd5e769 | 1791 | skipremount: |
614305f3 | 1792 | #endif |
911324ef DL |
1793 | DEBUG("mounted '%s' on '%s', type '%s'", fsname, target, fstype); |
1794 | ||
1795 | return 0; | |
1796 | } | |
1797 | ||
4e4ca161 SH |
1798 | /* |
1799 | * Remove 'optional', 'create=dir', and 'create=file' from mntopt | |
1800 | */ | |
1801 | static void cull_mntent_opt(struct mntent *mntent) | |
1802 | { | |
1803 | int i; | |
1804 | char *p, *p2; | |
1805 | char *list[] = {"create=dir", | |
1806 | "create=file", | |
1807 | "optional", | |
1808 | NULL }; | |
1809 | ||
1810 | for (i=0; list[i]; i++) { | |
1811 | if (!(p = strstr(mntent->mnt_opts, list[i]))) | |
1812 | continue; | |
1813 | p2 = strchr(p, ','); | |
1814 | if (!p2) { | |
1815 | /* no more mntopts, so just chop it here */ | |
1816 | *p = '\0'; | |
1817 | continue; | |
1818 | } | |
1819 | memmove(p, p2+1, strlen(p2+1)+1); | |
1820 | } | |
1821 | } | |
1822 | ||
4d5b72a1 | 1823 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
0a2dddd4 CB |
1824 | const char* path, const struct lxc_rootfs *rootfs, |
1825 | const char *lxc_name, const char *lxc_path) | |
0ad19a3f | 1826 | { |
4d5b72a1 | 1827 | char *pathdirname = NULL; |
608e3567 | 1828 | int ret = 0; |
34cfffb3 | 1829 | FILE *pathfile = NULL; |
911324ef | 1830 | |
6e46cc0d | 1831 | if (strncmp(mntent->mnt_type, "overlay", 7) == 0) { |
5c484f79 | 1832 | if (ovl_mkdir(mntent, rootfs, lxc_name, lxc_path) < 0) |
6e46cc0d CB |
1833 | return -1; |
1834 | } else if (strncmp(mntent->mnt_type, "aufs", 4) == 0) { | |
1d52bdf7 | 1835 | if (aufs_mkdir(mntent, rootfs, lxc_name, lxc_path) < 0) |
6e46cc0d CB |
1836 | return -1; |
1837 | } | |
1838 | ||
34cfffb3 | 1839 | if (hasmntopt(mntent, "create=dir")) { |
4d5b72a1 NC |
1840 | if (mkdir_p(path, 0755) < 0) { |
1841 | WARN("Failed to create mount target '%s'", path); | |
34cfffb3 SG |
1842 | ret = -1; |
1843 | } | |
1844 | } | |
1845 | ||
4d5b72a1 NC |
1846 | if (hasmntopt(mntent, "create=file") && access(path, F_OK)) { |
1847 | pathdirname = strdup(path); | |
34cfffb3 | 1848 | pathdirname = dirname(pathdirname); |
119126b6 SG |
1849 | if (mkdir_p(pathdirname, 0755) < 0) { |
1850 | WARN("Failed to create target directory"); | |
1851 | } | |
4d5b72a1 | 1852 | pathfile = fopen(path, "wb"); |
34cfffb3 | 1853 | if (!pathfile) { |
4d5b72a1 | 1854 | WARN("Failed to create mount target '%s'", path); |
34cfffb3 | 1855 | ret = -1; |
6e46cc0d | 1856 | } else { |
34cfffb3 | 1857 | fclose(pathfile); |
6e46cc0d | 1858 | } |
34cfffb3 | 1859 | } |
4d5b72a1 NC |
1860 | free(pathdirname); |
1861 | return ret; | |
1862 | } | |
1863 | ||
ec50007f CB |
1864 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
1865 | * without a rootfs. */ | |
db4aba38 | 1866 | static inline int mount_entry_on_generic(struct mntent *mntent, |
0a2dddd4 CB |
1867 | const char* path, const struct lxc_rootfs *rootfs, |
1868 | const char *lxc_name, const char *lxc_path) | |
4d5b72a1 NC |
1869 | { |
1870 | unsigned long mntflags; | |
1871 | char *mntdata; | |
1872 | int ret; | |
1873 | bool optional = hasmntopt(mntent, "optional") != NULL; | |
ae7a770e | 1874 | bool dev = hasmntopt(mntent, "dev") != NULL; |
4d5b72a1 | 1875 | |
ec50007f CB |
1876 | char *rootfs_path = NULL; |
1877 | if (rootfs && rootfs->path) | |
1878 | rootfs_path = rootfs->mount; | |
1879 | ||
0a2dddd4 | 1880 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, lxc_path); |
34cfffb3 | 1881 | |
608e3567 SH |
1882 | if (ret < 0) |
1883 | return optional ? 0 : -1; | |
1884 | ||
4e4ca161 SH |
1885 | cull_mntent_opt(mntent); |
1886 | ||
a17b1e65 SG |
1887 | if (parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata) < 0) { |
1888 | free(mntdata); | |
1889 | return -1; | |
1890 | } | |
1891 | ||
6e46cc0d | 1892 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
ae7a770e | 1893 | mntdata, optional, dev, rootfs_path); |
68c152ef | 1894 | |
911324ef | 1895 | free(mntdata); |
911324ef DL |
1896 | return ret; |
1897 | } | |
1898 | ||
db4aba38 NC |
1899 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
1900 | { | |
1433c9f9 CB |
1901 | char path[MAXPATHLEN]; |
1902 | int ret; | |
1903 | ||
1904 | /* For containers created without a rootfs all mounts are treated as | |
1905 | * absolute paths starting at / on the host. */ | |
1906 | if (mntent->mnt_dir[0] != '/') | |
1907 | ret = snprintf(path, sizeof(path), "/%s", mntent->mnt_dir); | |
1908 | else | |
1909 | ret = snprintf(path, sizeof(path), "%s", mntent->mnt_dir); | |
1910 | ||
1911 | if (ret < 0 || ret >= sizeof(path)) { | |
1912 | ERROR("path name too long"); | |
1913 | return -1; | |
1914 | } | |
1915 | ||
1916 | return mount_entry_on_generic(mntent, path, NULL, NULL, NULL); | |
db4aba38 NC |
1917 | } |
1918 | ||
4e4ca161 | 1919 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 | 1920 | const struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
1921 | const char *lxc_name, |
1922 | const char *lxc_path) | |
911324ef | 1923 | { |
013bd428 | 1924 | char *aux; |
59760f5d | 1925 | char path[MAXPATHLEN]; |
80a881b2 | 1926 | int r, ret = 0, offset; |
67e571de | 1927 | const char *lxcpath; |
0ad19a3f | 1928 | |
593e8478 | 1929 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
2a59a681 SH |
1930 | if (!lxcpath) { |
1931 | ERROR("Out of memory"); | |
1932 | return -1; | |
1933 | } | |
1934 | ||
80a881b2 | 1935 | /* if rootfs->path is a blockdev path, allow container fstab to |
2a59a681 SH |
1936 | * use $lxcpath/CN/rootfs as the target prefix */ |
1937 | r = snprintf(path, MAXPATHLEN, "%s/%s/rootfs", lxcpath, lxc_name); | |
80a881b2 SH |
1938 | if (r < 0 || r >= MAXPATHLEN) |
1939 | goto skipvarlib; | |
1940 | ||
1941 | aux = strstr(mntent->mnt_dir, path); | |
1942 | if (aux) { | |
1943 | offset = strlen(path); | |
1944 | goto skipabs; | |
1945 | } | |
1946 | ||
1947 | skipvarlib: | |
013bd428 DL |
1948 | aux = strstr(mntent->mnt_dir, rootfs->path); |
1949 | if (!aux) { | |
1950 | WARN("ignoring mount point '%s'", mntent->mnt_dir); | |
db4aba38 | 1951 | return ret; |
013bd428 | 1952 | } |
80a881b2 SH |
1953 | offset = strlen(rootfs->path); |
1954 | ||
1955 | skipabs: | |
013bd428 | 1956 | |
9ba8130c | 1957 | r = snprintf(path, MAXPATHLEN, "%s/%s", rootfs->mount, |
80a881b2 SH |
1958 | aux + offset); |
1959 | if (r < 0 || r >= MAXPATHLEN) { | |
1960 | WARN("pathnme too long for '%s'", mntent->mnt_dir); | |
a17b1e65 SG |
1961 | return -1; |
1962 | } | |
1963 | ||
0a2dddd4 | 1964 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef | 1965 | } |
d330fe7b | 1966 | |
4e4ca161 | 1967 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
0a2dddd4 CB |
1968 | const struct lxc_rootfs *rootfs, |
1969 | const char *lxc_name, | |
1970 | const char *lxc_path) | |
911324ef DL |
1971 | { |
1972 | char path[MAXPATHLEN]; | |
911324ef | 1973 | int ret; |
d330fe7b | 1974 | |
34cfffb3 | 1975 | /* relative to root mount point */ |
6e46cc0d | 1976 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs->mount, mntent->mnt_dir); |
1433c9f9 | 1977 | if (ret < 0 || ret >= sizeof(path)) { |
9ba8130c SH |
1978 | ERROR("path name too long"); |
1979 | return -1; | |
1980 | } | |
911324ef | 1981 | |
0a2dddd4 | 1982 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef DL |
1983 | } |
1984 | ||
80a881b2 | 1985 | static int mount_file_entries(const struct lxc_rootfs *rootfs, FILE *file, |
0a2dddd4 | 1986 | const char *lxc_name, const char *lxc_path) |
911324ef | 1987 | { |
aaf901be AM |
1988 | struct mntent mntent; |
1989 | char buf[4096]; | |
911324ef | 1990 | int ret = -1; |
e76b8764 | 1991 | |
aaf901be | 1992 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
e76b8764 | 1993 | |
911324ef | 1994 | if (!rootfs->path) { |
aaf901be | 1995 | if (mount_entry_on_systemfs(&mntent)) |
e76b8764 | 1996 | goto out; |
911324ef | 1997 | continue; |
e76b8764 CDC |
1998 | } |
1999 | ||
911324ef | 2000 | /* We have a separate root, mounts are relative to it */ |
aaf901be | 2001 | if (mntent.mnt_dir[0] != '/') { |
0a2dddd4 | 2002 | if (mount_entry_on_relative_rootfs(&mntent, rootfs, lxc_name, lxc_path)) |
911324ef DL |
2003 | goto out; |
2004 | continue; | |
2005 | } | |
cd54d859 | 2006 | |
0a2dddd4 | 2007 | if (mount_entry_on_absolute_rootfs(&mntent, rootfs, lxc_name, lxc_path)) |
911324ef | 2008 | goto out; |
0ad19a3f | 2009 | } |
cd54d859 | 2010 | |
0ad19a3f | 2011 | ret = 0; |
cd54d859 DL |
2012 | |
2013 | INFO("mount points have been setup"); | |
0ad19a3f | 2014 | out: |
e7938e9e MN |
2015 | return ret; |
2016 | } | |
2017 | ||
80a881b2 | 2018 | static int setup_mount(const struct lxc_rootfs *rootfs, const char *fstab, |
0a2dddd4 | 2019 | const char *lxc_name, const char *lxc_path) |
e7938e9e MN |
2020 | { |
2021 | FILE *file; | |
2022 | int ret; | |
2023 | ||
2024 | if (!fstab) | |
2025 | return 0; | |
2026 | ||
2027 | file = setmntent(fstab, "r"); | |
2028 | if (!file) { | |
2029 | SYSERROR("failed to use '%s'", fstab); | |
2030 | return -1; | |
2031 | } | |
2032 | ||
0a2dddd4 | 2033 | ret = mount_file_entries(rootfs, file, lxc_name, lxc_path); |
e7938e9e | 2034 | |
0ad19a3f | 2035 | endmntent(file); |
2036 | return ret; | |
2037 | } | |
2038 | ||
5ef5c9a3 | 2039 | FILE *make_anonymous_mount_file(struct lxc_list *mount) |
e7938e9e | 2040 | { |
5ef5c9a3 | 2041 | int ret; |
e7938e9e | 2042 | char *mount_entry; |
5ef5c9a3 CB |
2043 | struct lxc_list *iterator; |
2044 | FILE *file; | |
2045 | int fd = -1; | |
2046 | ||
2047 | fd = memfd_create("lxc_mount_file", MFD_CLOEXEC); | |
2048 | if (fd < 0) { | |
2049 | if (errno != ENOSYS) | |
2050 | return NULL; | |
2051 | file = tmpfile(); | |
2052 | } else { | |
2053 | file = fdopen(fd, "r+"); | |
2054 | } | |
e7938e9e | 2055 | |
e7938e9e | 2056 | if (!file) { |
fad6ef95 | 2057 | int saved_errno = errno; |
5ef5c9a3 CB |
2058 | if (fd != -1) |
2059 | close(fd); | |
fad6ef95 | 2060 | ERROR("Could not create mount entry file: %s.", strerror(saved_errno)); |
9fc7f8c0 | 2061 | return NULL; |
e7938e9e MN |
2062 | } |
2063 | ||
2064 | lxc_list_for_each(iterator, mount) { | |
2065 | mount_entry = iterator->elem; | |
5ef5c9a3 CB |
2066 | ret = fprintf(file, "%s\n", mount_entry); |
2067 | if (ret < strlen(mount_entry)) | |
2068 | WARN("Could not write mount entry to anonymous mount file."); | |
2069 | } | |
2070 | ||
2071 | if (fseek(file, 0, SEEK_SET) < 0) { | |
2072 | fclose(file); | |
2073 | return NULL; | |
e7938e9e MN |
2074 | } |
2075 | ||
9fc7f8c0 TA |
2076 | return file; |
2077 | } | |
2078 | ||
5ef5c9a3 CB |
2079 | static int setup_mount_entries(const struct lxc_rootfs *rootfs, |
2080 | struct lxc_list *mount, const char *lxc_name, | |
2081 | const char *lxc_path) | |
9fc7f8c0 TA |
2082 | { |
2083 | FILE *file; | |
2084 | int ret; | |
2085 | ||
5ef5c9a3 | 2086 | file = make_anonymous_mount_file(mount); |
9fc7f8c0 TA |
2087 | if (!file) |
2088 | return -1; | |
e7938e9e | 2089 | |
0a2dddd4 | 2090 | ret = mount_file_entries(rootfs, file, lxc_name, lxc_path); |
e7938e9e MN |
2091 | |
2092 | fclose(file); | |
2093 | return ret; | |
2094 | } | |
2095 | ||
bab88e68 CS |
2096 | static int parse_cap(const char *cap) |
2097 | { | |
2098 | char *ptr = NULL; | |
84760c11 | 2099 | size_t i; |
2100 | int capid = -1; | |
bab88e68 | 2101 | |
7035407c DE |
2102 | if (!strcmp(cap, "none")) |
2103 | return -2; | |
2104 | ||
bab88e68 CS |
2105 | for (i = 0; i < sizeof(caps_opt)/sizeof(caps_opt[0]); i++) { |
2106 | ||
2107 | if (strcmp(cap, caps_opt[i].name)) | |
2108 | continue; | |
2109 | ||
2110 | capid = caps_opt[i].value; | |
2111 | break; | |
2112 | } | |
2113 | ||
2114 | if (capid < 0) { | |
2115 | /* try to see if it's numeric, so the user may specify | |
2116 | * capabilities that the running kernel knows about but | |
2117 | * we don't */ | |
2118 | errno = 0; | |
2119 | capid = strtol(cap, &ptr, 10); | |
2120 | if (!ptr || *ptr != '\0' || errno != 0) | |
2121 | /* not a valid number */ | |
2122 | capid = -1; | |
2123 | else if (capid > lxc_caps_last_cap()) | |
2124 | /* we have a number but it's not a valid | |
2125 | * capability */ | |
2126 | capid = -1; | |
2127 | } | |
2128 | ||
2129 | return capid; | |
2130 | } | |
2131 | ||
0769b82a CS |
2132 | int in_caplist(int cap, struct lxc_list *caps) |
2133 | { | |
2134 | struct lxc_list *iterator; | |
2135 | int capid; | |
2136 | ||
2137 | lxc_list_for_each(iterator, caps) { | |
2138 | capid = parse_cap(iterator->elem); | |
2139 | if (capid == cap) | |
2140 | return 1; | |
2141 | } | |
2142 | ||
2143 | return 0; | |
2144 | } | |
2145 | ||
81810dd1 DL |
2146 | static int setup_caps(struct lxc_list *caps) |
2147 | { | |
2148 | struct lxc_list *iterator; | |
2149 | char *drop_entry; | |
bab88e68 | 2150 | int capid; |
81810dd1 DL |
2151 | |
2152 | lxc_list_for_each(iterator, caps) { | |
2153 | ||
2154 | drop_entry = iterator->elem; | |
2155 | ||
bab88e68 | 2156 | capid = parse_cap(drop_entry); |
d55bc1ad | 2157 | |
81810dd1 | 2158 | if (capid < 0) { |
1e11be34 DL |
2159 | ERROR("unknown capability %s", drop_entry); |
2160 | return -1; | |
81810dd1 DL |
2161 | } |
2162 | ||
2163 | DEBUG("drop capability '%s' (%d)", drop_entry, capid); | |
2164 | ||
2165 | if (prctl(PR_CAPBSET_DROP, capid, 0, 0, 0)) { | |
3ec1648d SH |
2166 | SYSERROR("failed to remove %s capability", drop_entry); |
2167 | return -1; | |
2168 | } | |
81810dd1 DL |
2169 | |
2170 | } | |
2171 | ||
1fb86a7c SH |
2172 | DEBUG("capabilities have been setup"); |
2173 | ||
2174 | return 0; | |
2175 | } | |
2176 | ||
2177 | static int dropcaps_except(struct lxc_list *caps) | |
2178 | { | |
2179 | struct lxc_list *iterator; | |
2180 | char *keep_entry; | |
1fb86a7c SH |
2181 | int i, capid; |
2182 | int numcaps = lxc_caps_last_cap() + 1; | |
959aee9c | 2183 | INFO("found %d capabilities", numcaps); |
1fb86a7c | 2184 | |
2caf9a97 SH |
2185 | if (numcaps <= 0 || numcaps > 200) |
2186 | return -1; | |
2187 | ||
1fb86a7c SH |
2188 | // caplist[i] is 1 if we keep capability i |
2189 | int *caplist = alloca(numcaps * sizeof(int)); | |
2190 | memset(caplist, 0, numcaps * sizeof(int)); | |
2191 | ||
2192 | lxc_list_for_each(iterator, caps) { | |
2193 | ||
2194 | keep_entry = iterator->elem; | |
2195 | ||
bab88e68 | 2196 | capid = parse_cap(keep_entry); |
1fb86a7c | 2197 | |
7035407c DE |
2198 | if (capid == -2) |
2199 | continue; | |
2200 | ||
1fb86a7c SH |
2201 | if (capid < 0) { |
2202 | ERROR("unknown capability %s", keep_entry); | |
2203 | return -1; | |
2204 | } | |
2205 | ||
8255688a | 2206 | DEBUG("keep capability '%s' (%d)", keep_entry, capid); |
1fb86a7c SH |
2207 | |
2208 | caplist[capid] = 1; | |
2209 | } | |
2210 | for (i=0; i<numcaps; i++) { | |
2211 | if (caplist[i]) | |
2212 | continue; | |
2213 | if (prctl(PR_CAPBSET_DROP, i, 0, 0, 0)) { | |
3ec1648d SH |
2214 | SYSERROR("failed to remove capability %d", i); |
2215 | return -1; | |
2216 | } | |
1fb86a7c SH |
2217 | } |
2218 | ||
2219 | DEBUG("capabilities have been setup"); | |
81810dd1 DL |
2220 | |
2221 | return 0; | |
2222 | } | |
2223 | ||
0ad19a3f | 2224 | static int setup_hw_addr(char *hwaddr, const char *ifname) |
2225 | { | |
2226 | struct sockaddr sockaddr; | |
2227 | struct ifreq ifr; | |
fad6ef95 | 2228 | int ret, fd, saved_errno; |
0ad19a3f | 2229 | |
3cfc0f3a MN |
2230 | ret = lxc_convert_mac(hwaddr, &sockaddr); |
2231 | if (ret) { | |
2232 | ERROR("mac address '%s' conversion failed : %s", | |
2233 | hwaddr, strerror(-ret)); | |
0ad19a3f | 2234 | return -1; |
2235 | } | |
2236 | ||
2237 | memcpy(ifr.ifr_name, ifname, IFNAMSIZ); | |
5da6aa8c | 2238 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
0ad19a3f | 2239 | memcpy((char *) &ifr.ifr_hwaddr, (char *) &sockaddr, sizeof(sockaddr)); |
2240 | ||
2241 | fd = socket(AF_INET, SOCK_DGRAM, 0); | |
2242 | if (fd < 0) { | |
3ab87b66 | 2243 | ERROR("socket failure : %s", strerror(errno)); |
0ad19a3f | 2244 | return -1; |
2245 | } | |
2246 | ||
2247 | ret = ioctl(fd, SIOCSIFHWADDR, &ifr); | |
fad6ef95 | 2248 | saved_errno = errno; |
0ad19a3f | 2249 | close(fd); |
2250 | if (ret) | |
fad6ef95 | 2251 | ERROR("ioctl failure : %s", strerror(saved_errno)); |
0ad19a3f | 2252 | |
5da6aa8c | 2253 | DEBUG("mac address '%s' on '%s' has been setup", hwaddr, ifr.ifr_name); |
cd54d859 | 2254 | |
0ad19a3f | 2255 | return ret; |
2256 | } | |
2257 | ||
82d5ae15 | 2258 | static int setup_ipv4_addr(struct lxc_list *ip, int ifindex) |
0ad19a3f | 2259 | { |
82d5ae15 DL |
2260 | struct lxc_list *iterator; |
2261 | struct lxc_inetdev *inetdev; | |
3cfc0f3a | 2262 | int err; |
0ad19a3f | 2263 | |
82d5ae15 DL |
2264 | lxc_list_for_each(iterator, ip) { |
2265 | ||
2266 | inetdev = iterator->elem; | |
2267 | ||
0093bb8c DL |
2268 | err = lxc_ipv4_addr_add(ifindex, &inetdev->addr, |
2269 | &inetdev->bcast, inetdev->prefix); | |
3cfc0f3a MN |
2270 | if (err) { |
2271 | ERROR("failed to setup_ipv4_addr ifindex %d : %s", | |
2272 | ifindex, strerror(-err)); | |
82d5ae15 DL |
2273 | return -1; |
2274 | } | |
2275 | } | |
2276 | ||
2277 | return 0; | |
0ad19a3f | 2278 | } |
2279 | ||
82d5ae15 | 2280 | static int setup_ipv6_addr(struct lxc_list *ip, int ifindex) |
0ad19a3f | 2281 | { |
82d5ae15 | 2282 | struct lxc_list *iterator; |
7fa9074f | 2283 | struct lxc_inet6dev *inet6dev; |
3cfc0f3a | 2284 | int err; |
0ad19a3f | 2285 | |
82d5ae15 DL |
2286 | lxc_list_for_each(iterator, ip) { |
2287 | ||
2288 | inet6dev = iterator->elem; | |
2289 | ||
b3df193c | 2290 | err = lxc_ipv6_addr_add(ifindex, &inet6dev->addr, |
0093bb8c DL |
2291 | &inet6dev->mcast, &inet6dev->acast, |
2292 | inet6dev->prefix); | |
3cfc0f3a MN |
2293 | if (err) { |
2294 | ERROR("failed to setup_ipv6_addr ifindex %d : %s", | |
2295 | ifindex, strerror(-err)); | |
82d5ae15 | 2296 | return -1; |
3cfc0f3a | 2297 | } |
82d5ae15 DL |
2298 | } |
2299 | ||
2300 | return 0; | |
0ad19a3f | 2301 | } |
2302 | ||
e337179a | 2303 | static int lxc_setup_netdev_in_child_namespaces(struct lxc_netdev *netdev) |
0ad19a3f | 2304 | { |
0ad19a3f | 2305 | char ifname[IFNAMSIZ]; |
3cfc0f3a | 2306 | int err; |
d1826cf1 CB |
2307 | const char *net_type_name; |
2308 | char *current_ifname = ifname; | |
0ad19a3f | 2309 | |
82d5ae15 DL |
2310 | /* empty network namespace */ |
2311 | if (!netdev->ifindex) { | |
b0efbac4 | 2312 | if (netdev->flags & IFF_UP) { |
d472214b | 2313 | err = lxc_netdev_up("lo"); |
3cfc0f3a MN |
2314 | if (err) { |
2315 | ERROR("failed to set the loopback up : %s", | |
2316 | strerror(-err)); | |
82d5ae15 DL |
2317 | return -1; |
2318 | } | |
82d5ae15 | 2319 | } |
d1826cf1 CB |
2320 | |
2321 | if (netdev->type == LXC_NET_EMPTY) | |
2322 | return 0; | |
2323 | ||
2324 | if (netdev->type == LXC_NET_NONE) | |
40790553 | 2325 | return 0; |
d1826cf1 CB |
2326 | |
2327 | if (netdev->type != LXC_NET_VETH) { | |
2328 | net_type_name = lxc_net_type_to_str(netdev->type); | |
2329 | ERROR("%s networks are not supported for containers " | |
2330 | "not setup up by privileged users", | |
2331 | net_type_name); | |
2332 | return -1; | |
2333 | } | |
2334 | ||
40790553 | 2335 | netdev->ifindex = if_nametoindex(netdev->name); |
0ad19a3f | 2336 | } |
13954cce | 2337 | |
b466dc33 | 2338 | /* get the new ifindex in case of physical netdev */ |
40790553 | 2339 | if (netdev->type == LXC_NET_PHYS) { |
b466dc33 BP |
2340 | if (!(netdev->ifindex = if_nametoindex(netdev->link))) { |
2341 | ERROR("failed to get ifindex for %s", | |
2342 | netdev->link); | |
2343 | return -1; | |
2344 | } | |
40790553 | 2345 | } |
b466dc33 | 2346 | |
82d5ae15 DL |
2347 | /* retrieve the name of the interface */ |
2348 | if (!if_indextoname(netdev->ifindex, current_ifname)) { | |
36eb9bde | 2349 | ERROR("no interface corresponding to index '%d'", |
82d5ae15 | 2350 | netdev->ifindex); |
0ad19a3f | 2351 | return -1; |
2352 | } | |
13954cce | 2353 | |
018ef520 | 2354 | /* default: let the system to choose one interface name */ |
9d083402 | 2355 | if (!netdev->name) |
fb6d9b2f DL |
2356 | netdev->name = netdev->type == LXC_NET_PHYS ? |
2357 | netdev->link : "eth%d"; | |
018ef520 | 2358 | |
82d5ae15 | 2359 | /* rename the interface name */ |
40790553 SH |
2360 | if (strcmp(ifname, netdev->name) != 0) { |
2361 | err = lxc_netdev_rename_by_name(ifname, netdev->name); | |
2362 | if (err) { | |
2363 | ERROR("failed to rename %s->%s : %s", ifname, netdev->name, | |
2364 | strerror(-err)); | |
2365 | return -1; | |
2366 | } | |
018ef520 DL |
2367 | } |
2368 | ||
2369 | /* Re-read the name of the interface because its name has changed | |
2370 | * and would be automatically allocated by the system | |
2371 | */ | |
82d5ae15 | 2372 | if (!if_indextoname(netdev->ifindex, current_ifname)) { |
018ef520 | 2373 | ERROR("no interface corresponding to index '%d'", |
82d5ae15 | 2374 | netdev->ifindex); |
018ef520 | 2375 | return -1; |
0ad19a3f | 2376 | } |
2377 | ||
82d5ae15 DL |
2378 | /* set a mac address */ |
2379 | if (netdev->hwaddr) { | |
2380 | if (setup_hw_addr(netdev->hwaddr, current_ifname)) { | |
36eb9bde | 2381 | ERROR("failed to setup hw address for '%s'", |
82d5ae15 | 2382 | current_ifname); |
0ad19a3f | 2383 | return -1; |
2384 | } | |
2385 | } | |
2386 | ||
82d5ae15 DL |
2387 | /* setup ipv4 addresses on the interface */ |
2388 | if (setup_ipv4_addr(&netdev->ipv4, netdev->ifindex)) { | |
36eb9bde | 2389 | ERROR("failed to setup ip addresses for '%s'", |
0ad19a3f | 2390 | ifname); |
2391 | return -1; | |
2392 | } | |
2393 | ||
82d5ae15 DL |
2394 | /* setup ipv6 addresses on the interface */ |
2395 | if (setup_ipv6_addr(&netdev->ipv6, netdev->ifindex)) { | |
36eb9bde | 2396 | ERROR("failed to setup ipv6 addresses for '%s'", |
0ad19a3f | 2397 | ifname); |
2398 | return -1; | |
2399 | } | |
2400 | ||
82d5ae15 | 2401 | /* set the network device up */ |
b0efbac4 | 2402 | if (netdev->flags & IFF_UP) { |
3cfc0f3a MN |
2403 | int err; |
2404 | ||
d472214b | 2405 | err = lxc_netdev_up(current_ifname); |
3cfc0f3a MN |
2406 | if (err) { |
2407 | ERROR("failed to set '%s' up : %s", current_ifname, | |
2408 | strerror(-err)); | |
0ad19a3f | 2409 | return -1; |
2410 | } | |
2411 | ||
2412 | /* the network is up, make the loopback up too */ | |
d472214b | 2413 | err = lxc_netdev_up("lo"); |
3cfc0f3a MN |
2414 | if (err) { |
2415 | ERROR("failed to set the loopback up : %s", | |
2416 | strerror(-err)); | |
0ad19a3f | 2417 | return -1; |
2418 | } | |
2419 | } | |
2420 | ||
f8fee0e2 MK |
2421 | /* We can only set up the default routes after bringing |
2422 | * up the interface, sine bringing up the interface adds | |
2423 | * the link-local routes and we can't add a default | |
2424 | * route if the gateway is not reachable. */ | |
2425 | ||
2426 | /* setup ipv4 gateway on the interface */ | |
2427 | if (netdev->ipv4_gateway) { | |
2428 | if (!(netdev->flags & IFF_UP)) { | |
2429 | ERROR("Cannot add ipv4 gateway for %s when not bringing up the interface", ifname); | |
2430 | return -1; | |
2431 | } | |
2432 | ||
2433 | if (lxc_list_empty(&netdev->ipv4)) { | |
2434 | ERROR("Cannot add ipv4 gateway for %s when not assigning an address", ifname); | |
2435 | return -1; | |
2436 | } | |
2437 | ||
2438 | err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway); | |
2439 | if (err) { | |
fc739df5 SG |
2440 | err = lxc_ipv4_dest_add(netdev->ifindex, netdev->ipv4_gateway); |
2441 | if (err) { | |
2442 | ERROR("failed to add ipv4 dest for '%s': %s", | |
2443 | ifname, strerror(-err)); | |
2444 | } | |
2445 | ||
2446 | err = lxc_ipv4_gateway_add(netdev->ifindex, netdev->ipv4_gateway); | |
2447 | if (err) { | |
2448 | ERROR("failed to setup ipv4 gateway for '%s': %s", | |
2449 | ifname, strerror(-err)); | |
2450 | if (netdev->ipv4_gateway_auto) { | |
2451 | char buf[INET_ADDRSTRLEN]; | |
2452 | inet_ntop(AF_INET, netdev->ipv4_gateway, buf, sizeof(buf)); | |
2453 | ERROR("tried to set autodetected ipv4 gateway '%s'", buf); | |
2454 | } | |
2455 | return -1; | |
19a26f82 | 2456 | } |
f8fee0e2 MK |
2457 | } |
2458 | } | |
2459 | ||
2460 | /* setup ipv6 gateway on the interface */ | |
2461 | if (netdev->ipv6_gateway) { | |
2462 | if (!(netdev->flags & IFF_UP)) { | |
2463 | ERROR("Cannot add ipv6 gateway for %s when not bringing up the interface", ifname); | |
2464 | return -1; | |
2465 | } | |
2466 | ||
2467 | if (lxc_list_empty(&netdev->ipv6) && !IN6_IS_ADDR_LINKLOCAL(netdev->ipv6_gateway)) { | |
2468 | ERROR("Cannot add ipv6 gateway for %s when not assigning an address", ifname); | |
2469 | return -1; | |
2470 | } | |
2471 | ||
2472 | err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway); | |
2473 | if (err) { | |
fc739df5 SG |
2474 | err = lxc_ipv6_dest_add(netdev->ifindex, netdev->ipv6_gateway); |
2475 | if (err) { | |
2476 | ERROR("failed to add ipv6 dest for '%s': %s", | |
f8fee0e2 | 2477 | ifname, strerror(-err)); |
19a26f82 | 2478 | } |
fc739df5 SG |
2479 | |
2480 | err = lxc_ipv6_gateway_add(netdev->ifindex, netdev->ipv6_gateway); | |
2481 | if (err) { | |
2482 | ERROR("failed to setup ipv6 gateway for '%s': %s", | |
2483 | ifname, strerror(-err)); | |
2484 | if (netdev->ipv6_gateway_auto) { | |
2485 | char buf[INET6_ADDRSTRLEN]; | |
2486 | inet_ntop(AF_INET6, netdev->ipv6_gateway, buf, sizeof(buf)); | |
2487 | ERROR("tried to set autodetected ipv6 gateway '%s'", buf); | |
2488 | } | |
2489 | return -1; | |
2490 | } | |
f8fee0e2 MK |
2491 | } |
2492 | } | |
2493 | ||
cd54d859 DL |
2494 | DEBUG("'%s' has been setup", current_ifname); |
2495 | ||
0ad19a3f | 2496 | return 0; |
2497 | } | |
2498 | ||
e337179a CB |
2499 | static int lxc_setup_networks_in_child_namespaces(const struct lxc_conf *conf, |
2500 | struct lxc_list *network) | |
0ad19a3f | 2501 | { |
82d5ae15 | 2502 | struct lxc_list *iterator; |
82d5ae15 | 2503 | struct lxc_netdev *netdev; |
0ad19a3f | 2504 | |
c302b476 CB |
2505 | lxc_log_configured_netdevs(conf); |
2506 | ||
5f4535a3 | 2507 | lxc_list_for_each(iterator, network) { |
5f4535a3 | 2508 | netdev = iterator->elem; |
82d5ae15 | 2509 | |
f9373e40 CB |
2510 | /* REMOVE in LXC 3.0 */ |
2511 | if (netdev->idx < 0) { | |
2512 | ERROR("WARNING: using \"lxc.network.*\" keys to define " | |
2513 | "networks is DEPRECATED, please switch to using " | |
2514 | "\"lxc.net.[i].* keys\""); | |
2515 | } | |
2516 | ||
e337179a | 2517 | if (lxc_setup_netdev_in_child_namespaces(netdev)) { |
82d5ae15 DL |
2518 | ERROR("failed to setup netdev"); |
2519 | return -1; | |
2520 | } | |
2521 | } | |
cd54d859 | 2522 | |
5f4535a3 DL |
2523 | if (!lxc_list_empty(network)) |
2524 | INFO("network has been setup"); | |
cd54d859 DL |
2525 | |
2526 | return 0; | |
0ad19a3f | 2527 | } |
2528 | ||
c6d09e15 WB |
2529 | static int parse_resource(const char *res) { |
2530 | size_t i; | |
2531 | int resid = -1; | |
2532 | ||
2533 | for (i = 0; i < sizeof(limit_opt)/sizeof(limit_opt[0]); ++i) { | |
2534 | if (strcmp(res, limit_opt[i].name) == 0) | |
2535 | return limit_opt[i].value; | |
2536 | } | |
2537 | ||
2538 | /* try to see if it's numeric, so the user may specify | |
2539 | * resources that the running kernel knows about but | |
2540 | * we don't */ | |
2541 | if (lxc_safe_int(res, &resid) == 0) | |
2542 | return resid; | |
2543 | return -1; | |
2544 | } | |
2545 | ||
2546 | int setup_resource_limits(struct lxc_list *limits, pid_t pid) { | |
2547 | struct lxc_list *it; | |
2548 | struct lxc_limit *lim; | |
2549 | int resid; | |
2550 | ||
2551 | lxc_list_for_each(it, limits) { | |
2552 | lim = it->elem; | |
2553 | ||
2554 | resid = parse_resource(lim->resource); | |
2555 | if (resid < 0) { | |
2556 | ERROR("unknown resource %s", lim->resource); | |
2557 | return -1; | |
2558 | } | |
2559 | ||
2560 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) { | |
2561 | ERROR("failed to set limit %s: %s", lim->resource, strerror(errno)); | |
2562 | return -1; | |
2563 | } | |
2564 | } | |
2565 | return 0; | |
2566 | } | |
2567 | ||
2af6bd1b | 2568 | /* try to move physical nics to the init netns */ |
5610055a | 2569 | void lxc_restore_phys_nics_to_netns(int netnsfd, struct lxc_conf *conf) |
2af6bd1b | 2570 | { |
64d2fcb5 | 2571 | int i, oldfd; |
4ec31c52 | 2572 | char ifname[IFNAMSIZ]; |
2af6bd1b | 2573 | |
5610055a | 2574 | if (netnsfd < 0 || conf->num_savednics == 0) |
2af6bd1b SH |
2575 | return; |
2576 | ||
64d2fcb5 | 2577 | INFO("Running to reset %d nic names.", conf->num_savednics); |
5610055a | 2578 | |
64d2fcb5 CB |
2579 | oldfd = lxc_preserve_ns(getpid(), "net"); |
2580 | if (oldfd < 0) { | |
2581 | SYSERROR("Failed to open monitor netns fd."); | |
2af6bd1b SH |
2582 | return; |
2583 | } | |
64d2fcb5 | 2584 | |
2af6bd1b SH |
2585 | if (setns(netnsfd, 0) != 0) { |
2586 | SYSERROR("Failed to enter container netns to reset nics"); | |
2587 | close(oldfd); | |
2588 | return; | |
2589 | } | |
2590 | for (i=0; i<conf->num_savednics; i++) { | |
2591 | struct saved_nic *s = &conf->saved_nics[i]; | |
f2e206ff | 2592 | /* retrieve the name of the interface */ |
2593 | if (!if_indextoname(s->ifindex, ifname)) { | |
2594 | WARN("no interface corresponding to index '%d'", s->ifindex); | |
2595 | continue; | |
2596 | } | |
5610055a | 2597 | if (lxc_netdev_move_by_name(ifname, 1, s->orig_name)) |
f2e206ff | 2598 | WARN("Error moving nic name:%s back to host netns", ifname); |
5610055a | 2599 | free(s->orig_name); |
2af6bd1b | 2600 | } |
5610055a WB |
2601 | conf->num_savednics = 0; |
2602 | ||
2af6bd1b SH |
2603 | if (setns(oldfd, 0) != 0) |
2604 | SYSERROR("Failed to re-enter monitor's netns"); | |
2605 | close(oldfd); | |
2606 | } | |
2607 | ||
ae9242c8 SH |
2608 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2609 | ||
7b379ab3 | 2610 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2611 | { |
7b379ab3 | 2612 | struct lxc_conf *new; |
26ddeedd | 2613 | int i; |
7b379ab3 | 2614 | |
13277ec4 | 2615 | new = malloc(sizeof(*new)); |
7b379ab3 | 2616 | if (!new) { |
13277ec4 | 2617 | ERROR("lxc_conf_init : %s", strerror(errno)); |
7b379ab3 MN |
2618 | return NULL; |
2619 | } | |
2620 | memset(new, 0, sizeof(*new)); | |
2621 | ||
4b73005c | 2622 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
cccc74b5 | 2623 | new->personality = -1; |
124fa0a8 | 2624 | new->autodev = 1; |
596a818d DE |
2625 | new->console.log_path = NULL; |
2626 | new->console.log_fd = -1; | |
28a4b0e5 | 2627 | new->console.path = NULL; |
63376d7d | 2628 | new->console.peer = -1; |
b5159817 DE |
2629 | new->console.peerpty.busy = -1; |
2630 | new->console.peerpty.master = -1; | |
2631 | new->console.peerpty.slave = -1; | |
63376d7d DL |
2632 | new->console.master = -1; |
2633 | new->console.slave = -1; | |
2634 | new->console.name[0] = '\0'; | |
d2e30e99 | 2635 | new->maincmd_fd = -1; |
76a26f55 | 2636 | new->nbd_idx = -1; |
54c30e29 | 2637 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 2638 | if (!new->rootfs.mount) { |
13277ec4 | 2639 | ERROR("lxc_conf_init : %s", strerror(errno)); |
53f3f048 SH |
2640 | free(new); |
2641 | return NULL; | |
2642 | } | |
858377e4 | 2643 | new->logfd = -1; |
7b379ab3 MN |
2644 | lxc_list_init(&new->cgroup); |
2645 | lxc_list_init(&new->network); | |
2646 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2647 | lxc_list_init(&new->caps); |
1fb86a7c | 2648 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2649 | lxc_list_init(&new->id_map); |
f979ac15 | 2650 | lxc_list_init(&new->includes); |
4184c3e1 | 2651 | lxc_list_init(&new->aliens); |
7c661726 | 2652 | lxc_list_init(&new->environment); |
c6d09e15 | 2653 | lxc_list_init(&new->limits); |
26ddeedd SH |
2654 | for (i=0; i<NUM_LXC_HOOKS; i++) |
2655 | lxc_list_init(&new->hooks[i]); | |
ee1e7aa0 | 2656 | lxc_list_init(&new->groups); |
fe4de9a6 DE |
2657 | new->lsm_aa_profile = NULL; |
2658 | new->lsm_se_context = NULL; | |
5112cd70 | 2659 | new->tmp_umount_proc = 0; |
7b379ab3 | 2660 | |
9f30a190 MM |
2661 | for (i = 0; i < LXC_NS_MAX; i++) |
2662 | new->inherit_ns_fd[i] = -1; | |
2663 | ||
72bb04e4 PT |
2664 | /* if running in a new user namespace, init and COMMAND |
2665 | * default to running as UID/GID 0 when using lxc-execute */ | |
2666 | new->init_uid = 0; | |
2667 | new->init_gid = 0; | |
2668 | ||
7b379ab3 | 2669 | return new; |
089cd8b8 DL |
2670 | } |
2671 | ||
a589434e | 2672 | static int instantiate_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2673 | { |
b0ee5983 CB |
2674 | char *veth1, *veth2; |
2675 | char veth1buf[IFNAMSIZ], veth2buf[IFNAMSIZ]; | |
b7b2fde4 CB |
2676 | int bridge_index, err; |
2677 | unsigned int mtu = 0; | |
13954cce | 2678 | |
8bee8851 | 2679 | if (netdev->priv.veth_attr.pair) { |
e892973e | 2680 | veth1 = netdev->priv.veth_attr.pair; |
8bee8851 WB |
2681 | if (handler->conf->reboot) |
2682 | lxc_netdev_delete_by_name(veth1); | |
2683 | } else { | |
9ba8130c SH |
2684 | err = snprintf(veth1buf, sizeof(veth1buf), "vethXXXXXX"); |
2685 | if (err >= sizeof(veth1buf)) { /* can't *really* happen, but... */ | |
2686 | ERROR("veth1 name too long"); | |
2687 | return -1; | |
2688 | } | |
a0265685 | 2689 | veth1 = lxc_mkifname(veth1buf); |
ad40563e ÇO |
2690 | if (!veth1) { |
2691 | ERROR("failed to allocate a temporary name"); | |
2692 | return -1; | |
2693 | } | |
74a2b586 JK |
2694 | /* store away for deconf */ |
2695 | memcpy(netdev->priv.veth_attr.veth1, veth1, IFNAMSIZ); | |
8634bc19 | 2696 | } |
82d5ae15 | 2697 | |
0e391e57 | 2698 | snprintf(veth2buf, sizeof(veth2buf), "vethXXXXXX"); |
a0265685 | 2699 | veth2 = lxc_mkifname(veth2buf); |
ad40563e | 2700 | if (!veth2) { |
82d5ae15 | 2701 | ERROR("failed to allocate a temporary name"); |
ad40563e | 2702 | goto out_delete; |
0ad19a3f | 2703 | } |
2704 | ||
3cfc0f3a MN |
2705 | err = lxc_veth_create(veth1, veth2); |
2706 | if (err) { | |
b0ee5983 CB |
2707 | ERROR("failed to create veth pair \"%s\" and \"%s\": %s", veth1, |
2708 | veth2, strerror(-err)); | |
ad40563e | 2709 | goto out_delete; |
0ad19a3f | 2710 | } |
13954cce | 2711 | |
49684c0b CS |
2712 | /* changing the high byte of the mac address to 0xfe, the bridge interface |
2713 | * will always keep the host's mac address and not take the mac address | |
2714 | * of a container */ | |
2715 | err = setup_private_host_hw_addr(veth1); | |
2716 | if (err) { | |
b0ee5983 CB |
2717 | ERROR("failed to change mac address of host interface \"%s\": %s", |
2718 | veth1, strerror(-err)); | |
49684c0b CS |
2719 | goto out_delete; |
2720 | } | |
2721 | ||
af651aa9 SN |
2722 | netdev->ifindex = if_nametoindex(veth2); |
2723 | if (!netdev->ifindex) { | |
b0ee5983 | 2724 | ERROR("failed to retrieve the index for \"%s\"", veth2); |
af651aa9 SN |
2725 | goto out_delete; |
2726 | } | |
2727 | ||
82d5ae15 | 2728 | if (netdev->mtu) { |
b7b2fde4 | 2729 | if (lxc_safe_uint(netdev->mtu, &mtu) < 0) |
b0ee5983 | 2730 | WARN("failed to parse mtu from"); |
b7b2fde4 | 2731 | else |
b0ee5983 | 2732 | INFO("retrieved mtu %d", mtu); |
e54864d3 | 2733 | } else if (netdev->link) { |
e9280f65 | 2734 | bridge_index = if_nametoindex(netdev->link); |
729e8bf6 CB |
2735 | if (bridge_index) { |
2736 | mtu = netdev_get_mtu(bridge_index); | |
b0ee5983 | 2737 | INFO("retrieved mtu %d from %s", mtu, netdev->link); |
729e8bf6 CB |
2738 | } else { |
2739 | mtu = netdev_get_mtu(netdev->ifindex); | |
b0ee5983 | 2740 | INFO("retrieved mtu %d from %s", mtu, veth2); |
729e8bf6 | 2741 | } |
e54864d3 NC |
2742 | } |
2743 | ||
2744 | if (mtu) { | |
2745 | err = lxc_netdev_set_mtu(veth1, mtu); | |
3cfc0f3a | 2746 | if (!err) |
e54864d3 | 2747 | err = lxc_netdev_set_mtu(veth2, mtu); |
3cfc0f3a | 2748 | if (err) { |
b0ee5983 CB |
2749 | ERROR("failed to set mtu \"%d\" for veth pair \"%s\" " |
2750 | "and \"%s\": %s", | |
e54864d3 | 2751 | mtu, veth1, veth2, strerror(-err)); |
eb14c10a | 2752 | goto out_delete; |
75d09f83 DL |
2753 | } |
2754 | } | |
2755 | ||
3cfc0f3a | 2756 | if (netdev->link) { |
c43cbc04 | 2757 | err = lxc_bridge_attach(handler->lxcpath, handler->name, netdev->link, veth1); |
3cfc0f3a | 2758 | if (err) { |
b0ee5983 CB |
2759 | ERROR("failed to attach \"%s\" to bridge \"%s\": %s", |
2760 | veth1, netdev->link, strerror(-err)); | |
3cfc0f3a MN |
2761 | goto out_delete; |
2762 | } | |
b0ee5983 | 2763 | INFO("attached \"%s\" to bridge \"%s\"", veth1, netdev->link); |
eb14c10a DL |
2764 | } |
2765 | ||
d472214b | 2766 | err = lxc_netdev_up(veth1); |
6e35af2e | 2767 | if (err) { |
b0ee5983 | 2768 | ERROR("failed to set \"%s\" up: %s", veth1, strerror(-err)); |
6e35af2e | 2769 | goto out_delete; |
0ad19a3f | 2770 | } |
2771 | ||
e3b4c4c4 | 2772 | if (netdev->upscript) { |
751d9dcd DL |
2773 | err = run_script(handler->name, "net", netdev->upscript, "up", |
2774 | "veth", veth1, (char*) NULL); | |
2775 | if (err) | |
e3b4c4c4 | 2776 | goto out_delete; |
e3b4c4c4 ST |
2777 | } |
2778 | ||
b0ee5983 CB |
2779 | DEBUG("instantiated veth \"%s/%s\", index is \"%d\"", veth1, veth2, |
2780 | netdev->ifindex); | |
82d5ae15 | 2781 | |
6ab9ab6d | 2782 | return 0; |
eb14c10a DL |
2783 | |
2784 | out_delete: | |
b316d209 CB |
2785 | if (netdev->ifindex != 0) |
2786 | lxc_netdev_delete_by_name(veth1); | |
f10fad2f | 2787 | if (!netdev->priv.veth_attr.pair) |
ad40563e | 2788 | free(veth1); |
f10fad2f | 2789 | free(veth2); |
6ab9ab6d | 2790 | return -1; |
13954cce | 2791 | } |
d957ae2d | 2792 | |
74a2b586 JK |
2793 | static int shutdown_veth(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2794 | { | |
2795 | char *veth1; | |
2796 | int err; | |
2797 | ||
2798 | if (netdev->priv.veth_attr.pair) | |
2799 | veth1 = netdev->priv.veth_attr.pair; | |
2800 | else | |
2801 | veth1 = netdev->priv.veth_attr.veth1; | |
2802 | ||
2803 | if (netdev->downscript) { | |
2804 | err = run_script(handler->name, "net", netdev->downscript, | |
2805 | "down", "veth", veth1, (char*) NULL); | |
2806 | if (err) | |
2807 | return -1; | |
2808 | } | |
2809 | return 0; | |
2810 | } | |
2811 | ||
a589434e | 2812 | static int instantiate_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2813 | { |
0e391e57 | 2814 | char peerbuf[IFNAMSIZ], *peer; |
3cfc0f3a | 2815 | int err; |
d957ae2d MT |
2816 | |
2817 | if (!netdev->link) { | |
2818 | ERROR("no link specified for macvlan netdev"); | |
2819 | return -1; | |
2820 | } | |
13954cce | 2821 | |
9ba8130c SH |
2822 | err = snprintf(peerbuf, sizeof(peerbuf), "mcXXXXXX"); |
2823 | if (err >= sizeof(peerbuf)) | |
2824 | return -1; | |
82d5ae15 | 2825 | |
a0265685 | 2826 | peer = lxc_mkifname(peerbuf); |
ad40563e | 2827 | if (!peer) { |
82d5ae15 DL |
2828 | ERROR("failed to make a temporary name"); |
2829 | return -1; | |
0ad19a3f | 2830 | } |
2831 | ||
3cfc0f3a MN |
2832 | err = lxc_macvlan_create(netdev->link, peer, |
2833 | netdev->priv.macvlan_attr.mode); | |
2834 | if (err) { | |
2835 | ERROR("failed to create macvlan interface '%s' on '%s' : %s", | |
2836 | peer, netdev->link, strerror(-err)); | |
ad40563e | 2837 | goto out; |
0ad19a3f | 2838 | } |
2839 | ||
82d5ae15 DL |
2840 | netdev->ifindex = if_nametoindex(peer); |
2841 | if (!netdev->ifindex) { | |
36eb9bde | 2842 | ERROR("failed to retrieve the index for %s", peer); |
ad40563e | 2843 | goto out; |
22ebac19 | 2844 | } |
2845 | ||
e3b4c4c4 | 2846 | if (netdev->upscript) { |
751d9dcd DL |
2847 | err = run_script(handler->name, "net", netdev->upscript, "up", |
2848 | "macvlan", netdev->link, (char*) NULL); | |
2849 | if (err) | |
ad40563e | 2850 | goto out; |
e3b4c4c4 ST |
2851 | } |
2852 | ||
a589434e | 2853 | DEBUG("instantiated macvlan '%s', index is '%d' and mode '%d'", |
e892973e | 2854 | peer, netdev->ifindex, netdev->priv.macvlan_attr.mode); |
0ad19a3f | 2855 | |
d957ae2d | 2856 | return 0; |
ad40563e ÇO |
2857 | out: |
2858 | lxc_netdev_delete_by_name(peer); | |
2859 | free(peer); | |
2860 | return -1; | |
0ad19a3f | 2861 | } |
2862 | ||
74a2b586 JK |
2863 | static int shutdown_macvlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2864 | { | |
2865 | int err; | |
2866 | ||
2867 | if (netdev->downscript) { | |
2868 | err = run_script(handler->name, "net", netdev->downscript, | |
2869 | "down", "macvlan", netdev->link, | |
2870 | (char*) NULL); | |
2871 | if (err) | |
2872 | return -1; | |
2873 | } | |
2874 | return 0; | |
2875 | } | |
2876 | ||
a589434e JN |
2877 | /* XXX: merge with instantiate_macvlan */ |
2878 | static int instantiate_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) | |
26c39028 JHS |
2879 | { |
2880 | char peer[IFNAMSIZ]; | |
3cfc0f3a | 2881 | int err; |
82f58d03 | 2882 | static uint16_t vlan_cntr = 0; |
b7b2fde4 | 2883 | unsigned int mtu = 0; |
26c39028 JHS |
2884 | |
2885 | if (!netdev->link) { | |
2886 | ERROR("no link specified for vlan netdev"); | |
2887 | return -1; | |
2888 | } | |
2889 | ||
82f58d03 | 2890 | err = snprintf(peer, sizeof(peer), "vlan%d-%d", netdev->priv.vlan_attr.vid, vlan_cntr++); |
9ba8130c SH |
2891 | if (err >= sizeof(peer)) { |
2892 | ERROR("peer name too long"); | |
2893 | return -1; | |
2894 | } | |
26c39028 | 2895 | |
3cfc0f3a MN |
2896 | err = lxc_vlan_create(netdev->link, peer, netdev->priv.vlan_attr.vid); |
2897 | if (err) { | |
2898 | ERROR("failed to create vlan interface '%s' on '%s' : %s", | |
2899 | peer, netdev->link, strerror(-err)); | |
26c39028 JHS |
2900 | return -1; |
2901 | } | |
2902 | ||
2903 | netdev->ifindex = if_nametoindex(peer); | |
2904 | if (!netdev->ifindex) { | |
2905 | ERROR("failed to retrieve the ifindex for %s", peer); | |
b84f58b9 | 2906 | lxc_netdev_delete_by_name(peer); |
26c39028 JHS |
2907 | return -1; |
2908 | } | |
2909 | ||
a589434e | 2910 | DEBUG("instantiated vlan '%s', ifindex is '%d'", " vlan1000", |
e892973e | 2911 | netdev->ifindex); |
b4fb7de1 | 2912 | if (netdev->mtu) { |
b7b2fde4 CB |
2913 | if (lxc_safe_uint(netdev->mtu, &mtu) < 0) { |
2914 | ERROR("Failed to retrieve mtu from: '%d'/'%s'.", | |
2915 | netdev->ifindex, netdev->name); | |
2916 | return -1; | |
2917 | } | |
2918 | err = lxc_netdev_set_mtu(peer, mtu); | |
b4fb7de1 VL |
2919 | if (err) { |
2920 | ERROR("failed to set mtu '%s' for %s : %s", | |
2921 | netdev->mtu, peer, strerror(-err)); | |
2922 | lxc_netdev_delete_by_name(peer); | |
2923 | return -1; | |
2924 | } | |
2925 | } | |
e892973e | 2926 | |
26c39028 JHS |
2927 | return 0; |
2928 | } | |
2929 | ||
74a2b586 JK |
2930 | static int shutdown_vlan(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2931 | { | |
2932 | return 0; | |
2933 | } | |
2934 | ||
a589434e | 2935 | static int instantiate_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2936 | { |
6168e99f DL |
2937 | if (!netdev->link) { |
2938 | ERROR("no link specified for the physical interface"); | |
2939 | return -1; | |
2940 | } | |
2941 | ||
9d083402 | 2942 | netdev->ifindex = if_nametoindex(netdev->link); |
82d5ae15 | 2943 | if (!netdev->ifindex) { |
9d083402 | 2944 | ERROR("failed to retrieve the index for %s", netdev->link); |
0ad19a3f | 2945 | return -1; |
2946 | } | |
2947 | ||
e3b4c4c4 ST |
2948 | if (netdev->upscript) { |
2949 | int err; | |
751d9dcd DL |
2950 | err = run_script(handler->name, "net", netdev->upscript, |
2951 | "up", "phys", netdev->link, (char*) NULL); | |
2952 | if (err) | |
e3b4c4c4 | 2953 | return -1; |
e3b4c4c4 ST |
2954 | } |
2955 | ||
82d5ae15 | 2956 | return 0; |
0ad19a3f | 2957 | } |
2958 | ||
74a2b586 JK |
2959 | static int shutdown_phys(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2960 | { | |
2961 | int err; | |
2962 | ||
2963 | if (netdev->downscript) { | |
2964 | err = run_script(handler->name, "net", netdev->downscript, | |
2965 | "down", "phys", netdev->link, (char*) NULL); | |
2966 | if (err) | |
2967 | return -1; | |
2968 | } | |
2969 | return 0; | |
2970 | } | |
2971 | ||
a589434e | 2972 | static int instantiate_none(struct lxc_handler *handler, struct lxc_netdev *netdev) |
26b797f3 SH |
2973 | { |
2974 | netdev->ifindex = 0; | |
2975 | return 0; | |
2976 | } | |
2977 | ||
a589434e | 2978 | static int instantiate_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) |
0ad19a3f | 2979 | { |
82d5ae15 | 2980 | netdev->ifindex = 0; |
e3b4c4c4 ST |
2981 | if (netdev->upscript) { |
2982 | int err; | |
751d9dcd DL |
2983 | err = run_script(handler->name, "net", netdev->upscript, |
2984 | "up", "empty", (char*) NULL); | |
2985 | if (err) | |
e3b4c4c4 | 2986 | return -1; |
e3b4c4c4 | 2987 | } |
82d5ae15 | 2988 | return 0; |
0ad19a3f | 2989 | } |
2990 | ||
74a2b586 JK |
2991 | static int shutdown_empty(struct lxc_handler *handler, struct lxc_netdev *netdev) |
2992 | { | |
2993 | int err; | |
2994 | ||
2995 | if (netdev->downscript) { | |
2996 | err = run_script(handler->name, "net", netdev->downscript, | |
2997 | "down", "empty", (char*) NULL); | |
2998 | if (err) | |
2999 | return -1; | |
3000 | } | |
3001 | return 0; | |
3002 | } | |
3003 | ||
26b797f3 SH |
3004 | static int shutdown_none(struct lxc_handler *handler, struct lxc_netdev *netdev) |
3005 | { | |
3006 | return 0; | |
3007 | } | |
3008 | ||
3009 | int lxc_requests_empty_network(struct lxc_handler *handler) | |
3010 | { | |
3011 | struct lxc_list *network = &handler->conf->network; | |
3012 | struct lxc_list *iterator; | |
3013 | struct lxc_netdev *netdev; | |
3014 | bool found_none = false, found_nic = false; | |
3015 | ||
3016 | if (lxc_list_empty(network)) | |
3017 | return 0; | |
3018 | ||
3019 | lxc_list_for_each(iterator, network) { | |
3020 | ||
3021 | netdev = iterator->elem; | |
3022 | ||
3023 | if (netdev->type == LXC_NET_NONE) | |
3024 | found_none = true; | |
3025 | else | |
3026 | found_nic = true; | |
3027 | } | |
3028 | if (found_none && !found_nic) | |
3029 | return 1; | |
3030 | return 0; | |
3031 | } | |
3032 | ||
e337179a | 3033 | int lxc_setup_networks_in_parent_namespaces(struct lxc_handler *handler) |
0ad19a3f | 3034 | { |
e337179a | 3035 | bool am_root; |
82d5ae15 | 3036 | struct lxc_netdev *netdev; |
e337179a CB |
3037 | struct lxc_list *iterator; |
3038 | struct lxc_list *network = &handler->conf->network; | |
cbef6c52 | 3039 | |
e337179a CB |
3040 | /* We need to be root. */ |
3041 | am_root = (getuid() == 0); | |
cbef6c52 SH |
3042 | if (!am_root) |
3043 | return 0; | |
0ad19a3f | 3044 | |
5f4535a3 | 3045 | lxc_list_for_each(iterator, network) { |
5f4535a3 | 3046 | netdev = iterator->elem; |
13954cce | 3047 | |
e337179a CB |
3048 | if (netdev->type < 0 || netdev->type > LXC_NET_MAXCONFTYPE) { |
3049 | ERROR("invalid network configuration type '%d'", | |
3050 | netdev->type); | |
56637458 CB |
3051 | return -1; |
3052 | } | |
3053 | ||
e337179a CB |
3054 | if (netdev->type != LXC_NET_MACVLAN && |
3055 | netdev->priv.macvlan_attr.mode) { | |
3056 | ERROR("Invalid macvlan.mode for a non-macvlan netdev"); | |
56637458 CB |
3057 | return -1; |
3058 | } | |
3059 | ||
e337179a CB |
3060 | if (netdev->type != LXC_NET_VETH && |
3061 | netdev->priv.veth_attr.pair) { | |
3062 | ERROR("Invalid veth pair for a non-veth netdev"); | |
56637458 CB |
3063 | return -1; |
3064 | } | |
3065 | ||
e337179a CB |
3066 | if (netdev->type != LXC_NET_VLAN && |
3067 | netdev->priv.vlan_attr.vid > 0) { | |
3068 | ERROR("Invalid vlan.id for a non-macvlan netdev"); | |
82d5ae15 DL |
3069 | return -1; |
3070 | } | |
0ad19a3f | 3071 | |
e3b4c4c4 | 3072 | if (netdev_conf[netdev->type](handler, netdev)) { |
82d5ae15 DL |
3073 | ERROR("failed to create netdev"); |
3074 | return -1; | |
3075 | } | |
e3b4c4c4 | 3076 | |
0ad19a3f | 3077 | } |
3078 | ||
3079 | return 0; | |
3080 | } | |
3081 | ||
358daf49 | 3082 | bool lxc_delete_network(struct lxc_handler *handler) |
7fef7a06 | 3083 | { |
e97946ae | 3084 | int ret; |
74a2b586 | 3085 | struct lxc_list *network = &handler->conf->network; |
7fef7a06 DL |
3086 | struct lxc_list *iterator; |
3087 | struct lxc_netdev *netdev; | |
358daf49 | 3088 | bool deleted_all = true; |
7fef7a06 DL |
3089 | |
3090 | lxc_list_for_each(iterator, network) { | |
3091 | netdev = iterator->elem; | |
d472214b | 3092 | |
74a2b586 | 3093 | if (netdev->ifindex != 0 && netdev->type == LXC_NET_PHYS) { |
d8f8e352 | 3094 | if (lxc_netdev_rename_by_index(netdev->ifindex, netdev->link)) |
358daf49 CB |
3095 | WARN("Failed to rename interface with index %d " |
3096 | "to its initial name \"%s\".", | |
3097 | netdev->ifindex, netdev->link); | |
d472214b | 3098 | continue; |
d8f8e352 | 3099 | } |
d472214b | 3100 | |
74a2b586 | 3101 | if (netdev_deconf[netdev->type](handler, netdev)) { |
e97946ae | 3102 | WARN("Failed to destroy netdev"); |
74a2b586 JK |
3103 | } |
3104 | ||
d8f8e352 DL |
3105 | /* Recent kernel remove the virtual interfaces when the network |
3106 | * namespace is destroyed but in case we did not moved the | |
3107 | * interface to the network namespace, we have to destroy it | |
3108 | */ | |
e97946ae CB |
3109 | if (netdev->ifindex != 0) { |
3110 | ret = lxc_netdev_delete_by_index(netdev->ifindex); | |
358daf49 CB |
3111 | if (-ret == ENODEV) { |
3112 | INFO("Interface \"%s\" with index %d already " | |
3113 | "deleted or existing in different network " | |
3114 | "namespace.", | |
3115 | netdev->name ? netdev->name : "(null)", | |
3116 | netdev->ifindex); | |
3117 | } else if (ret < 0) { | |
3118 | deleted_all = false; | |
3119 | WARN("Failed to remove interface \"%s\" with " | |
3120 | "index %d: %s.", | |
3121 | netdev->name ? netdev->name : "(null)", | |
3122 | netdev->ifindex, strerror(-ret)); | |
3123 | } else { | |
3124 | INFO("Removed interface \"%s\" with index %d.", | |
3125 | netdev->name ? netdev->name : "(null)", | |
3126 | netdev->ifindex); | |
3127 | } | |
e97946ae CB |
3128 | } |
3129 | ||
3130 | /* Explicitly delete host veth device to prevent lingering | |
3131 | * devices. We had issues in LXD around this. | |
3132 | */ | |
b316d209 | 3133 | if (netdev->ifindex != 0 && netdev->type == LXC_NET_VETH && !am_unpriv()) { |
358daf49 CB |
3134 | char *hostveth; |
3135 | if (netdev->priv.veth_attr.pair) { | |
e97946ae | 3136 | hostveth = netdev->priv.veth_attr.pair; |
358daf49 CB |
3137 | ret = lxc_netdev_delete_by_name(hostveth); |
3138 | if (ret < 0) { | |
3139 | WARN("Failed to remove interface \"%s\" from host: %s.", hostveth, strerror(-ret)); | |
3140 | } else { | |
3141 | INFO("Removed interface \"%s\" from host.", hostveth); | |
358daf49 CB |
3142 | } |
3143 | } else if (strlen(netdev->priv.veth_attr.veth1) > 0) { | |
e97946ae | 3144 | hostveth = netdev->priv.veth_attr.veth1; |
e97946ae | 3145 | ret = lxc_netdev_delete_by_name(hostveth); |
358daf49 CB |
3146 | if (ret < 0) { |
3147 | WARN("Failed to remove \"%s\" from host: %s.", hostveth, strerror(-ret)); | |
3148 | } else { | |
3149 | INFO("Removed interface \"%s\" from host.", hostveth); | |
3150 | memset((void *)&netdev->priv.veth_attr.veth1, 0, sizeof(netdev->priv.veth_attr.veth1)); | |
3151 | } | |
e97946ae CB |
3152 | } |
3153 | } | |
7fef7a06 | 3154 | } |
358daf49 CB |
3155 | |
3156 | return deleted_all; | |
7fef7a06 DL |
3157 | } |
3158 | ||
45e854dc SG |
3159 | #define LXC_USERNIC_PATH LIBEXECDIR "/lxc/lxc-user-nic" |
3160 | ||
fe1f672f | 3161 | /* lxc-user-nic returns "interface_name:interface_name\n" */ |
eab15c1e | 3162 | #define MAX_BUFFER_SIZE IFNAMSIZ * 2 + 2 |
c43cbc04 SH |
3163 | static int unpriv_assign_nic(const char *lxcpath, char *lxcname, |
3164 | struct lxc_netdev *netdev, pid_t pid) | |
cbef6c52 SH |
3165 | { |
3166 | pid_t child; | |
a7242d9a ÇO |
3167 | int bytes, pipefd[2]; |
3168 | char *token, *saveptr = NULL; | |
fe1f672f | 3169 | char buffer[MAX_BUFFER_SIZE]; |
091045f8 | 3170 | char netdev_link[IFNAMSIZ + 1]; |
cbef6c52 SH |
3171 | |
3172 | if (netdev->type != LXC_NET_VETH) { | |
3173 | ERROR("nic type %d not support for unprivileged use", | |
091045f8 | 3174 | netdev->type); |
cbef6c52 SH |
3175 | return -1; |
3176 | } | |
3177 | ||
091045f8 | 3178 | if (pipe(pipefd) < 0) { |
a7242d9a ÇO |
3179 | SYSERROR("pipe failed"); |
3180 | return -1; | |
3181 | } | |
3182 | ||
091045f8 CB |
3183 | child = fork(); |
3184 | if (child < 0) { | |
cbef6c52 | 3185 | SYSERROR("fork"); |
a7242d9a ÇO |
3186 | close(pipefd[0]); |
3187 | close(pipefd[1]); | |
3188 | return -1; | |
3189 | } | |
3190 | ||
3191 | if (child == 0) { // child | |
091045f8 CB |
3192 | /* Call lxc-user-nic pid type bridge. */ |
3193 | int ret; | |
3194 | char pidstr[LXC_NUMSTRLEN64]; | |
3195 | ||
3196 | close(pipefd[0]); /* Close the read-end of the pipe. */ | |
3197 | ||
3198 | /* Redirect stdout to write-end of the pipe. */ | |
3199 | ret = dup2(pipefd[1], STDOUT_FILENO); | |
3200 | close(pipefd[1]); /* Close the write-end of the pipe. */ | |
3201 | if (ret < 0) { | |
3202 | SYSERROR("Failed to dup2() to redirect stdout to pipe file descriptor."); | |
3203 | exit(EXIT_FAILURE); | |
3204 | } | |
a7242d9a | 3205 | |
091045f8 | 3206 | if (netdev->link) |
cff7b5eb | 3207 | strncpy(netdev_link, netdev->link, IFNAMSIZ); |
091045f8 | 3208 | else |
cff7b5eb | 3209 | strncpy(netdev_link, "none", IFNAMSIZ); |
091045f8 CB |
3210 | |
3211 | ret = snprintf(pidstr, LXC_NUMSTRLEN64, "%d", pid); | |
3212 | if (ret < 0 || ret >= LXC_NUMSTRLEN64) | |
3213 | exit(EXIT_FAILURE); | |
3214 | pidstr[LXC_NUMSTRLEN64 - 1] = '\0'; | |
3215 | ||
3216 | INFO("Execing lxc-user-nic %s %s %s veth %s %s", lxcpath, | |
3217 | lxcname, pidstr, netdev_link, netdev->name); | |
c43cbc04 | 3218 | execlp(LXC_USERNIC_PATH, LXC_USERNIC_PATH, lxcpath, lxcname, |
091045f8 CB |
3219 | pidstr, "veth", netdev_link, netdev->name, NULL); |
3220 | ||
3221 | SYSERROR("Failed to exec lxc-user-nic."); | |
3222 | exit(EXIT_FAILURE); | |
a7242d9a ÇO |
3223 | } |
3224 | ||
3225 | /* close the write-end of the pipe */ | |
3226 | close(pipefd[1]); | |
3227 | ||
fe1f672f | 3228 | bytes = read(pipefd[0], &buffer, MAX_BUFFER_SIZE); |
091045f8 CB |
3229 | if (bytes < 0) |
3230 | SYSERROR("Failed to read from pipe file descriptor."); | |
a7242d9a ÇO |
3231 | buffer[bytes - 1] = '\0'; |
3232 | ||
3233 | if (wait_for_pid(child) != 0) { | |
3234 | close(pipefd[0]); | |
cbef6c52 SH |
3235 | return -1; |
3236 | } | |
3237 | ||
a7242d9a ÇO |
3238 | /* close the read-end of the pipe */ |
3239 | close(pipefd[0]); | |
cbef6c52 | 3240 | |
a7242d9a ÇO |
3241 | /* fill netdev->name field */ |
3242 | token = strtok_r(buffer, ":", &saveptr); | |
3243 | if (!token) | |
3244 | return -1; | |
091045f8 CB |
3245 | |
3246 | netdev->name = malloc(IFNAMSIZ + 1); | |
658979c5 | 3247 | if (!netdev->name) { |
091045f8 | 3248 | SYSERROR("Failed to allocate memory."); |
658979c5 SH |
3249 | return -1; |
3250 | } | |
091045f8 | 3251 | memset(netdev->name, 0, IFNAMSIZ + 1); |
658979c5 | 3252 | strncpy(netdev->name, token, IFNAMSIZ); |
a7242d9a ÇO |
3253 | |
3254 | /* fill netdev->veth_attr.pair field */ | |
3255 | token = strtok_r(NULL, ":", &saveptr); | |
3256 | if (!token) | |
3257 | return -1; | |
091045f8 | 3258 | |
a7242d9a | 3259 | netdev->priv.veth_attr.pair = strdup(token); |
658979c5 | 3260 | if (!netdev->priv.veth_attr.pair) { |
091045f8 | 3261 | ERROR("Failed to allocate memory."); |
658979c5 SH |
3262 | return -1; |
3263 | } | |
45e854dc | 3264 | |
a7242d9a | 3265 | return 0; |
cbef6c52 SH |
3266 | } |
3267 | ||
c43cbc04 SH |
3268 | int lxc_assign_network(const char *lxcpath, char *lxcname, |
3269 | struct lxc_list *network, pid_t pid) | |
0ad19a3f | 3270 | { |
82d5ae15 | 3271 | struct lxc_list *iterator; |
82d5ae15 | 3272 | struct lxc_netdev *netdev; |
f2e206ff | 3273 | char ifname[IFNAMSIZ]; |
cbef6c52 | 3274 | int am_root = (getuid() == 0); |
3cfc0f3a | 3275 | int err; |
0ad19a3f | 3276 | |
5f4535a3 | 3277 | lxc_list_for_each(iterator, network) { |
82d5ae15 | 3278 | |
5f4535a3 | 3279 | netdev = iterator->elem; |
82d5ae15 | 3280 | |
fbb16259 | 3281 | if (netdev->type == LXC_NET_VETH && !am_root) { |
72ccbbe1 SC |
3282 | if (netdev->mtu) |
3283 | INFO("mtu ignored due to insufficient privilege"); | |
c43cbc04 | 3284 | if (unpriv_assign_nic(lxcpath, lxcname, netdev, pid)) |
cbef6c52 | 3285 | return -1; |
e337179a CB |
3286 | /* lxc-user-nic has moved the nic to the new ns. |
3287 | * unpriv_assign_nic() fills in netdev->name. | |
3288 | * netdev->ifindex will be filed in at | |
3289 | * lxc_setup_netdev_in_child_namespaces. | |
3290 | */ | |
cbef6c52 SH |
3291 | continue; |
3292 | } | |
236087a6 | 3293 | |
fbb16259 SH |
3294 | /* empty network namespace, nothing to move */ |
3295 | if (!netdev->ifindex) | |
3296 | continue; | |
3297 | ||
f2e206ff | 3298 | /* retrieve the name of the interface */ |
3299 | if (!if_indextoname(netdev->ifindex, ifname)) { | |
3300 | ERROR("no interface corresponding to index '%d'", netdev->ifindex); | |
3301 | return -1; | |
3302 | } | |
3303 | ||
3304 | err = lxc_netdev_move_by_name(ifname, pid, NULL); | |
3cfc0f3a MN |
3305 | if (err) { |
3306 | ERROR("failed to move '%s' to the container : %s", | |
3307 | netdev->link, strerror(-err)); | |
82d5ae15 DL |
3308 | return -1; |
3309 | } | |
3310 | ||
198cbbaa | 3311 | DEBUG("move '%s'/'%s' to '%d': .", ifname, netdev->name, pid); |
0ad19a3f | 3312 | } |
3313 | ||
3314 | return 0; | |
3315 | } | |
3316 | ||
251d0d2a DE |
3317 | static int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
3318 | size_t buf_size) | |
f6d3e3e4 | 3319 | { |
29053180 CB |
3320 | char path[MAXPATHLEN]; |
3321 | int fd, ret; | |
f6d3e3e4 | 3322 | |
29053180 CB |
3323 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/%cid_map", pid, |
3324 | idtype == ID_TYPE_UID ? 'u' : 'g'); | |
3325 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3326 | ERROR("failed to create path \"%s\"", path); | |
f6d3e3e4 SH |
3327 | return -E2BIG; |
3328 | } | |
29053180 CB |
3329 | |
3330 | fd = open(path, O_WRONLY); | |
3331 | if (fd < 0) { | |
3332 | SYSERROR("failed to open \"%s\"", path); | |
3333 | return -1; | |
f6d3e3e4 | 3334 | } |
29053180 CB |
3335 | |
3336 | errno = 0; | |
3337 | ret = lxc_write_nointr(fd, buf, buf_size); | |
3338 | if (ret != buf_size) { | |
3339 | SYSERROR("failed to write %cid mapping to \"%s\"", | |
3340 | idtype == ID_TYPE_UID ? 'u' : 'g', path); | |
3341 | close(fd); | |
3342 | return -1; | |
3343 | } | |
3344 | close(fd); | |
3345 | ||
3346 | return 0; | |
f6d3e3e4 SH |
3347 | } |
3348 | ||
6e50e704 CB |
3349 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
3350 | * | |
3351 | * @return 1 if functional binary was found | |
3352 | * @return 0 if binary exists but is lacking privilege | |
3353 | * @return -ENOENT if binary does not exist | |
3354 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
3355 | * | |
3356 | */ | |
df6a2945 CB |
3357 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
3358 | { | |
3359 | char *path; | |
3360 | int ret; | |
3361 | struct stat st; | |
3362 | int fret = 0; | |
3363 | ||
6e50e704 CB |
3364 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
3365 | return -EINVAL; | |
3366 | ||
df6a2945 CB |
3367 | path = on_path(binary, NULL); |
3368 | if (!path) | |
3369 | return -ENOENT; | |
3370 | ||
3371 | ret = stat(path, &st); | |
3372 | if (ret < 0) { | |
3373 | fret = -errno; | |
3374 | goto cleanup; | |
3375 | } | |
3376 | ||
3377 | /* Check if the binary is setuid. */ | |
3378 | if (st.st_mode & S_ISUID) { | |
3379 | DEBUG("The binary \"%s\" does have the setuid bit set.", path); | |
3380 | fret = 1; | |
3381 | goto cleanup; | |
3382 | } | |
3383 | ||
69924fff | 3384 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
3385 | /* Check if it has the CAP_SETUID capability. */ |
3386 | if ((cap & CAP_SETUID) && | |
3387 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
3388 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) { | |
3389 | DEBUG("The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE " | |
3390 | "and CAP_PERMITTED sets.", path); | |
3391 | fret = 1; | |
3392 | goto cleanup; | |
3393 | } | |
3394 | ||
3395 | /* Check if it has the CAP_SETGID capability. */ | |
3396 | if ((cap & CAP_SETGID) && | |
3397 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
3398 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) { | |
3399 | DEBUG("The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE " | |
3400 | "and CAP_PERMITTED sets.", path); | |
3401 | fret = 1; | |
3402 | goto cleanup; | |
3403 | } | |
d6018f88 | 3404 | #else |
69924fff CB |
3405 | /* If we cannot check for file capabilities we need to give the benefit |
3406 | * of the doubt. Otherwise we might fail even though all the necessary | |
3407 | * file capabilities are set. | |
3408 | */ | |
d6018f88 CB |
3409 | DEBUG("Cannot check for file capabilites as full capability support is " |
3410 | "missing. Manual intervention needed."); | |
3411 | fret = 1; | |
df6a2945 CB |
3412 | #endif |
3413 | ||
3414 | cleanup: | |
3415 | free(path); | |
3416 | return fret; | |
3417 | } | |
3418 | ||
986ef930 CB |
3419 | int lxc_map_ids_exec_wrapper(void *args) |
3420 | { | |
3421 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
3422 | return -1; | |
3423 | } | |
3424 | ||
f6d3e3e4 SH |
3425 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) |
3426 | { | |
f6d3e3e4 | 3427 | struct id_map *map; |
4bc3b759 | 3428 | struct lxc_list *iterator; |
251d0d2a | 3429 | enum idtype type; |
986ef930 | 3430 | char u_or_g; |
4bc3b759 | 3431 | char *pos; |
99d43365 | 3432 | int fill, left; |
986ef930 CB |
3433 | char cmd_output[MAXPATHLEN]; |
3434 | /* strlen("new@idmap") = 9 | |
3435 | * + | |
3436 | * strlen(" ") = 1 | |
3437 | * + | |
3438 | * LXC_NUMSTRLEN64 | |
3439 | * + | |
3440 | * strlen(" ") = 1 | |
3441 | * | |
3442 | * We add some additional space to make sure that we really have | |
3443 | * LXC_IDMAPLEN bytes available for our the {g,u]id mapping. | |
3444 | */ | |
3445 | char mapbuf[9 + 1 + LXC_NUMSTRLEN64 + 1 + LXC_IDMAPLEN] = {0}; | |
3446 | int ret = 0, uidmap = 0, gidmap = 0; | |
3447 | bool use_shadow = false, had_entry = false; | |
df6a2945 CB |
3448 | |
3449 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid | |
3450 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
3451 | * will protected it by preventing another user from being handed the |
3452 | * range by shadow. | |
3453 | */ | |
df6a2945 | 3454 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
3455 | if (uidmap == -ENOENT) |
3456 | WARN("newuidmap binary is missing"); | |
3457 | else if (!uidmap) | |
3458 | WARN("newuidmap is lacking necessary privileges"); | |
3459 | ||
df6a2945 | 3460 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
3461 | if (gidmap == -ENOENT) |
3462 | WARN("newgidmap binary is missing"); | |
3463 | else if (!gidmap) | |
3464 | WARN("newgidmap is lacking necessary privileges"); | |
3465 | ||
df6a2945 CB |
3466 | if (uidmap > 0 && gidmap > 0) { |
3467 | DEBUG("Functional newuidmap and newgidmap binary found."); | |
4bc3b759 | 3468 | use_shadow = true; |
df6a2945 | 3469 | } else { |
99d43365 CB |
3470 | /* In case unprivileged users run application containers via |
3471 | * execute() or a start*() there are valid cases where they may | |
3472 | * only want to map their own {g,u}id. Let's not block them from | |
3473 | * doing so by requiring geteuid() == 0. | |
3474 | */ | |
3475 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
3476 | "write directly with euid %d.", geteuid()); | |
0e6e3a41 | 3477 | } |
251d0d2a | 3478 | |
986ef930 CB |
3479 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
3480 | type++, u_or_g = 'g') { | |
3481 | pos = mapbuf; | |
3482 | ||
0e6e3a41 | 3483 | if (use_shadow) |
986ef930 | 3484 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 3485 | |
cf3ef16d | 3486 | lxc_list_for_each(iterator, idmap) { |
4bc3b759 CB |
3487 | /* The kernel only takes <= 4k for writes to |
3488 | * /proc/<nr>/[ug]id_map | |
3489 | */ | |
251d0d2a | 3490 | map = iterator->elem; |
cf3ef16d SH |
3491 | if (map->idtype != type) |
3492 | continue; | |
3493 | ||
4bc3b759 CB |
3494 | had_entry = true; |
3495 | ||
986ef930 | 3496 | left = LXC_IDMAPLEN - (pos - mapbuf); |
d1838f34 | 3497 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
3498 | use_shadow ? " " : "", map->nsid, |
3499 | map->hostid, map->range, | |
0e6e3a41 | 3500 | use_shadow ? "" : "\n"); |
cf3ef16d | 3501 | if (fill <= 0 || fill >= left) |
4bc3b759 CB |
3502 | SYSERROR("Too many {g,u}id mappings defined."); |
3503 | ||
cf3ef16d | 3504 | pos += fill; |
251d0d2a | 3505 | } |
cf3ef16d | 3506 | if (!had_entry) |
4f7521b4 | 3507 | continue; |
cf3ef16d | 3508 | |
986ef930 CB |
3509 | /* Try to catch the ouput of new{g,u}idmap to make debugging |
3510 | * easier. | |
3511 | */ | |
3512 | if (use_shadow) { | |
3513 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3514 | lxc_map_ids_exec_wrapper, | |
3515 | (void *)mapbuf); | |
3516 | if (ret < 0) { | |
3517 | ERROR("new%cidmap failed to write mapping: %s", | |
3518 | u_or_g, cmd_output); | |
3519 | return -1; | |
3520 | } | |
d1838f34 | 3521 | } else { |
986ef930 CB |
3522 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
3523 | if (ret < 0) | |
3524 | return -1; | |
d1838f34 | 3525 | } |
986ef930 CB |
3526 | |
3527 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 3528 | } |
251d0d2a | 3529 | |
986ef930 | 3530 | return 0; |
f6d3e3e4 SH |
3531 | } |
3532 | ||
cf3ef16d | 3533 | /* |
7b50c609 TS |
3534 | * return the host uid/gid to which the container root is mapped in |
3535 | * *val. | |
0b3a6504 | 3536 | * Return true if id was found, false otherwise. |
cf3ef16d | 3537 | */ |
2a9a80cb | 3538 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
3ec1648d | 3539 | unsigned long *val) |
cf3ef16d SH |
3540 | { |
3541 | struct lxc_list *it; | |
3542 | struct id_map *map; | |
3543 | ||
3544 | lxc_list_for_each(it, &conf->id_map) { | |
3545 | map = it->elem; | |
7b50c609 | 3546 | if (map->idtype != idtype) |
cf3ef16d SH |
3547 | continue; |
3548 | if (map->nsid != 0) | |
3549 | continue; | |
2a9a80cb SH |
3550 | *val = map->hostid; |
3551 | return true; | |
cf3ef16d | 3552 | } |
2a9a80cb | 3553 | return false; |
cf3ef16d SH |
3554 | } |
3555 | ||
2133f58c | 3556 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d SH |
3557 | { |
3558 | struct lxc_list *it; | |
3559 | struct id_map *map; | |
3560 | lxc_list_for_each(it, &conf->id_map) { | |
3561 | map = it->elem; | |
2133f58c | 3562 | if (map->idtype != idtype) |
cf3ef16d SH |
3563 | continue; |
3564 | if (id >= map->hostid && id < map->hostid + map->range) | |
57d116ab | 3565 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 3566 | } |
57d116ab | 3567 | return -1; |
cf3ef16d SH |
3568 | } |
3569 | ||
339efad9 | 3570 | int find_unmapped_nsid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d SH |
3571 | { |
3572 | struct lxc_list *it; | |
3573 | struct id_map *map; | |
2133f58c | 3574 | unsigned int freeid = 0; |
cf3ef16d SH |
3575 | again: |
3576 | lxc_list_for_each(it, &conf->id_map) { | |
3577 | map = it->elem; | |
2133f58c | 3578 | if (map->idtype != idtype) |
cf3ef16d SH |
3579 | continue; |
3580 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { | |
3581 | freeid = map->nsid + map->range; | |
3582 | goto again; | |
3583 | } | |
3584 | } | |
3585 | return freeid; | |
3586 | } | |
3587 | ||
19a26f82 MK |
3588 | int lxc_find_gateway_addresses(struct lxc_handler *handler) |
3589 | { | |
3590 | struct lxc_list *network = &handler->conf->network; | |
3591 | struct lxc_list *iterator; | |
3592 | struct lxc_netdev *netdev; | |
3593 | int link_index; | |
3594 | ||
3595 | lxc_list_for_each(iterator, network) { | |
3596 | netdev = iterator->elem; | |
3597 | ||
3598 | if (!netdev->ipv4_gateway_auto && !netdev->ipv6_gateway_auto) | |
3599 | continue; | |
3600 | ||
3601 | if (netdev->type != LXC_NET_VETH && netdev->type != LXC_NET_MACVLAN) { | |
3602 | ERROR("gateway = auto only supported for " | |
3603 | "veth and macvlan"); | |
3604 | return -1; | |
3605 | } | |
3606 | ||
3607 | if (!netdev->link) { | |
3608 | ERROR("gateway = auto needs a link interface"); | |
3609 | return -1; | |
3610 | } | |
3611 | ||
3612 | link_index = if_nametoindex(netdev->link); | |
3613 | if (!link_index) | |
3614 | return -EINVAL; | |
3615 | ||
3616 | if (netdev->ipv4_gateway_auto) { | |
3617 | if (lxc_ipv4_addr_get(link_index, &netdev->ipv4_gateway)) { | |
3618 | ERROR("failed to automatically find ipv4 gateway " | |
3619 | "address from link interface '%s'", netdev->link); | |
3620 | return -1; | |
3621 | } | |
3622 | } | |
3623 | ||
3624 | if (netdev->ipv6_gateway_auto) { | |
3625 | if (lxc_ipv6_addr_get(link_index, &netdev->ipv6_gateway)) { | |
3626 | ERROR("failed to automatically find ipv6 gateway " | |
3627 | "address from link interface '%s'", netdev->link); | |
3628 | return -1; | |
3629 | } | |
3630 | } | |
3631 | } | |
3632 | ||
3633 | return 0; | |
3634 | } | |
3635 | ||
5e4a62bf | 3636 | int lxc_create_tty(const char *name, struct lxc_conf *conf) |
b0a33c1e | 3637 | { |
5e4a62bf | 3638 | struct lxc_tty_info *tty_info = &conf->tty_info; |
025ed0f3 | 3639 | int i, ret; |
b0a33c1e | 3640 | |
5e4a62bf DL |
3641 | /* no tty in the configuration */ |
3642 | if (!conf->tty) | |
b0a33c1e | 3643 | return 0; |
3644 | ||
9e1045e3 | 3645 | tty_info->pty_info = malloc(sizeof(*tty_info->pty_info) * conf->tty); |
b0a33c1e | 3646 | if (!tty_info->pty_info) { |
9e1045e3 CB |
3647 | SYSERROR("failed to allocate struct *pty_info"); |
3648 | return -ENOMEM; | |
b0a33c1e | 3649 | } |
3650 | ||
985d15b1 | 3651 | for (i = 0; i < conf->tty; i++) { |
b0a33c1e | 3652 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; |
3653 | ||
025ed0f3 SH |
3654 | process_lock(); |
3655 | ret = openpty(&pty_info->master, &pty_info->slave, | |
9e1045e3 | 3656 | pty_info->name, NULL, NULL); |
025ed0f3 SH |
3657 | process_unlock(); |
3658 | if (ret) { | |
9e1045e3 | 3659 | SYSERROR("failed to create pty device number %d", i); |
985d15b1 MT |
3660 | tty_info->nbtty = i; |
3661 | lxc_delete_tty(tty_info); | |
9e1045e3 | 3662 | return -ENOTTY; |
b0a33c1e | 3663 | } |
3664 | ||
9e1045e3 | 3665 | DEBUG("allocated pty \"%s\" with master fd %d and slave fd %d", |
5332bb84 DL |
3666 | pty_info->name, pty_info->master, pty_info->slave); |
3667 | ||
3ec1648d | 3668 | /* Prevent leaking the file descriptors to the container */ |
9e1045e3 CB |
3669 | ret = fcntl(pty_info->master, F_SETFD, FD_CLOEXEC); |
3670 | if (ret < 0) | |
3671 | WARN("failed to set FD_CLOEXEC flag on master fd %d of " | |
3672 | "pty device \"%s\": %s", | |
3673 | pty_info->master, pty_info->name, strerror(errno)); | |
3674 | ||
3675 | ret = fcntl(pty_info->slave, F_SETFD, FD_CLOEXEC); | |
3676 | if (ret < 0) | |
3677 | WARN("failed to set FD_CLOEXEC flag on slave fd %d of " | |
3678 | "pty device \"%s\": %s", | |
3679 | pty_info->slave, pty_info->name, strerror(errno)); | |
b035ad62 | 3680 | |
b0a33c1e | 3681 | pty_info->busy = 0; |
3682 | } | |
3683 | ||
985d15b1 | 3684 | tty_info->nbtty = conf->tty; |
1ac470c0 | 3685 | |
9e1045e3 | 3686 | INFO("finished allocating %d pts devices", conf->tty); |
985d15b1 | 3687 | return 0; |
b0a33c1e | 3688 | } |
3689 | ||
3690 | void lxc_delete_tty(struct lxc_tty_info *tty_info) | |
3691 | { | |
3692 | int i; | |
3693 | ||
3694 | for (i = 0; i < tty_info->nbtty; i++) { | |
3695 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
3696 | ||
3697 | close(pty_info->master); | |
3698 | close(pty_info->slave); | |
3699 | } | |
3700 | ||
3701 | free(tty_info->pty_info); | |
e00c0242 | 3702 | tty_info->pty_info = NULL; |
b0a33c1e | 3703 | tty_info->nbtty = 0; |
3704 | } | |
3705 | ||
f4f52cb5 CB |
3706 | |
3707 | int chown_mapped_root_exec_wrapper(void *args) | |
3708 | { | |
3709 | execvp("lxc-usernsexec", args); | |
3710 | return -1; | |
3711 | } | |
3712 | ||
f6d3e3e4 | 3713 | /* |
7b50c609 TS |
3714 | * chown_mapped_root: for an unprivileged user with uid/gid X to |
3715 | * chown a dir to subuid/subgid Y, he needs to run chown as root | |
3716 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
3717 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
3718 | * root is privileged with respect to hostuid/hostgid X, allowing | |
3719 | * him to do the chown. | |
f6d3e3e4 | 3720 | */ |
c4d10a05 | 3721 | int chown_mapped_root(char *path, struct lxc_conf *conf) |
f6d3e3e4 | 3722 | { |
f4f52cb5 | 3723 | uid_t rootuid, rootgid; |
2a9a80cb | 3724 | unsigned long val; |
a7ef8753 | 3725 | char *chownpath = path; |
f4f52cb5 CB |
3726 | int hostuid, hostgid, ret; |
3727 | struct stat sb; | |
3728 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
3729 | char ugid[100]; | |
3730 | char *args1[] = {"lxc-usernsexec", | |
3731 | "-m", map1, | |
3732 | "-m", map2, | |
3733 | "-m", map3, | |
3734 | "-m", map5, | |
3735 | "--", "chown", ugid, path, | |
3736 | NULL}; | |
3737 | char *args2[] = {"lxc-usernsexec", | |
3738 | "-m", map1, | |
3739 | "-m", map2, | |
3740 | "-m", map3, | |
3741 | "-m", map4, | |
3742 | "-m", map5, | |
3743 | "--", "chown", ugid, path, | |
3744 | NULL}; | |
3745 | char cmd_output[MAXPATHLEN]; | |
3746 | ||
3747 | hostuid = geteuid(); | |
3748 | hostgid = getegid(); | |
f6d3e3e4 | 3749 | |
2a9a80cb | 3750 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
bc80f098 | 3751 | ERROR("No uid mapping for container root"); |
c4d10a05 | 3752 | return -1; |
f6d3e3e4 | 3753 | } |
f4f52cb5 | 3754 | rootuid = (uid_t)val; |
7b50c609 | 3755 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { |
bc80f098 | 3756 | ERROR("No gid mapping for container root"); |
7b50c609 TS |
3757 | return -1; |
3758 | } | |
f4f52cb5 | 3759 | rootgid = (gid_t)val; |
2a9a80cb | 3760 | |
a7ef8753 | 3761 | /* |
f4f52cb5 | 3762 | * In case of overlay, we want only the writeable layer to be chowned |
a7ef8753 | 3763 | */ |
1f92162d | 3764 | if (strncmp(path, "overlayfs:", 10) == 0 || strncmp(path, "aufs:", 5) == 0) { |
a7ef8753 SH |
3765 | chownpath = strchr(path, ':'); |
3766 | if (!chownpath) { | |
3767 | ERROR("Bad overlay path: %s", path); | |
3768 | return -1; | |
3769 | } | |
f4f52cb5 | 3770 | chownpath = strchr(chownpath + 1, ':'); |
a7ef8753 SH |
3771 | if (!chownpath) { |
3772 | ERROR("Bad overlay path: %s", path); | |
3773 | return -1; | |
3774 | } | |
3775 | chownpath++; | |
3776 | } | |
3777 | path = chownpath; | |
f4f52cb5 | 3778 | if (hostuid == 0) { |
7b50c609 | 3779 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3780 | ERROR("Error chowning %s", path); |
3781 | return -1; | |
3782 | } | |
3783 | return 0; | |
3784 | } | |
f3d7e4ca | 3785 | |
f4f52cb5 | 3786 | if (rootuid == hostuid) { |
f3d7e4ca | 3787 | // nothing to do |
b103ceac | 3788 | INFO("Container root is our uid; no need to chown"); |
f3d7e4ca SH |
3789 | return 0; |
3790 | } | |
3791 | ||
bbdbf8f0 | 3792 | /* save the current gid of "path" */ |
f4f52cb5 CB |
3793 | if (stat(path, &sb) < 0) { |
3794 | ERROR("Error stat %s", path); | |
f6d3e3e4 SH |
3795 | return -1; |
3796 | } | |
7b50c609 | 3797 | |
bbdbf8f0 CB |
3798 | /* Update the path argument in case this was overlayfs. */ |
3799 | args1[sizeof(args1) / sizeof(args1[0]) - 2] = path; | |
3800 | args2[sizeof(args2) / sizeof(args2[0]) - 2] = path; | |
3801 | ||
f4f52cb5 CB |
3802 | /* |
3803 | * A file has to be group-owned by a gid mapped into the | |
3804 | * container, or the container won't be privileged over it. | |
3805 | */ | |
3806 | DEBUG("trying to chown \"%s\" to %d", path, hostgid); | |
3807 | if (sb.st_uid == hostuid && | |
3808 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3809 | chown(path, -1, hostgid) < 0) { | |
3810 | ERROR("Failed chgrping %s", path); | |
3811 | return -1; | |
3812 | } | |
f6d3e3e4 | 3813 | |
f4f52cb5 CB |
3814 | // "u:0:rootuid:1" |
3815 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); | |
3816 | if (ret < 0 || ret >= 100) { | |
3817 | ERROR("Error uid printing map string"); | |
3818 | return -1; | |
3819 | } | |
7b50c609 | 3820 | |
f4f52cb5 CB |
3821 | // "u:hostuid:hostuid:1" |
3822 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); | |
3823 | if (ret < 0 || ret >= 100) { | |
3824 | ERROR("Error uid printing map string"); | |
3825 | return -1; | |
3826 | } | |
c4d10a05 | 3827 | |
f4f52cb5 CB |
3828 | // "g:0:rootgid:1" |
3829 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); | |
3830 | if (ret < 0 || ret >= 100) { | |
3831 | ERROR("Error gid printing map string"); | |
3832 | return -1; | |
3833 | } | |
98e5ba51 | 3834 | |
f4f52cb5 CB |
3835 | // "g:pathgid:rootgid+pathgid:1" |
3836 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, | |
3837 | rootgid + (gid_t)sb.st_gid); | |
3838 | if (ret < 0 || ret >= 100) { | |
3839 | ERROR("Error gid printing map string"); | |
3840 | return -1; | |
3841 | } | |
c4d10a05 | 3842 | |
f4f52cb5 CB |
3843 | // "g:hostgid:hostgid:1" |
3844 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); | |
3845 | if (ret < 0 || ret >= 100) { | |
3846 | ERROR("Error gid printing map string"); | |
3847 | return -1; | |
3848 | } | |
7b50c609 | 3849 | |
f4f52cb5 CB |
3850 | // "0:pathgid" (chown) |
3851 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); | |
3852 | if (ret < 0 || ret >= 100) { | |
3853 | ERROR("Error owner printing format string for chown"); | |
3854 | return -1; | |
3855 | } | |
7b50c609 | 3856 | |
f4f52cb5 CB |
3857 | if (hostgid == sb.st_gid) |
3858 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3859 | chown_mapped_root_exec_wrapper, | |
3860 | (void *)args1); | |
3861 | else | |
3862 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3863 | chown_mapped_root_exec_wrapper, | |
3864 | (void *)args2); | |
3865 | if (ret < 0) | |
3866 | ERROR("lxc-usernsexec failed: %s", cmd_output); | |
7b50c609 | 3867 | |
f4f52cb5 | 3868 | return ret; |
f6d3e3e4 SH |
3869 | } |
3870 | ||
54117de5 | 3871 | int lxc_ttys_shift_ids(struct lxc_conf *c) |
f6d3e3e4 | 3872 | { |
c4d10a05 | 3873 | if (lxc_list_empty(&c->id_map)) |
f6d3e3e4 | 3874 | return 0; |
c4d10a05 | 3875 | |
54117de5 CB |
3876 | if (!strcmp(c->console.name, "")) |
3877 | return 0; | |
3878 | ||
3879 | if (chown_mapped_root(c->console.name, c) < 0) { | |
3880 | ERROR("failed to chown console \"%s\"", c->console.name); | |
c4d10a05 SH |
3881 | return -1; |
3882 | } | |
3883 | ||
54117de5 CB |
3884 | TRACE("chowned console \"%s\"", c->console.name); |
3885 | ||
f6d3e3e4 SH |
3886 | return 0; |
3887 | } | |
3888 | ||
943144d9 CB |
3889 | /* NOTE: Must not be called from inside the container namespace! */ |
3890 | int lxc_create_tmp_proc_mount(struct lxc_conf *conf) | |
5112cd70 SH |
3891 | { |
3892 | int mounted; | |
3893 | ||
943144d9 | 3894 | mounted = lxc_mount_proc_if_needed(conf->rootfs.path ? conf->rootfs.mount : ""); |
5112cd70 | 3895 | if (mounted == -1) { |
943144d9 | 3896 | SYSERROR("failed to mount /proc in the container"); |
01958b1f | 3897 | /* continue only if there is no rootfs */ |
943144d9 | 3898 | if (conf->rootfs.path) |
01958b1f | 3899 | return -1; |
5112cd70 | 3900 | } else if (mounted == 1) { |
943144d9 | 3901 | conf->tmp_umount_proc = 1; |
5112cd70 | 3902 | } |
943144d9 | 3903 | |
5112cd70 SH |
3904 | return 0; |
3905 | } | |
3906 | ||
3907 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3908 | { | |
3909 | if (lxc_conf->tmp_umount_proc == 1) { | |
3910 | umount("/proc"); | |
3911 | lxc_conf->tmp_umount_proc = 0; | |
3912 | } | |
3913 | } | |
3914 | ||
6a0c909a | 3915 | void remount_all_slave(void) |
e995d7a2 SH |
3916 | { |
3917 | /* walk /proc/mounts and change any shared entries to slave */ | |
3918 | FILE *f = fopen("/proc/self/mountinfo", "r"); | |
3919 | char *line = NULL; | |
3920 | size_t len = 0; | |
3921 | ||
3922 | if (!f) { | |
3923 | SYSERROR("Failed to open /proc/self/mountinfo to mark all shared"); | |
3924 | ERROR("Continuing container startup..."); | |
3925 | return; | |
3926 | } | |
3927 | ||
3928 | while (getline(&line, &len, f) != -1) { | |
3929 | char *target, *opts; | |
3930 | target = get_field(line, 4); | |
3931 | if (!target) | |
3932 | continue; | |
3933 | opts = get_field(target, 2); | |
3934 | if (!opts) | |
3935 | continue; | |
3936 | null_endofword(opts); | |
3937 | if (!strstr(opts, "shared")) | |
3938 | continue; | |
3939 | null_endofword(target); | |
3940 | if (mount(NULL, target, NULL, MS_SLAVE, NULL)) { | |
3941 | SYSERROR("Failed to make %s rslave", target); | |
3942 | ERROR("Continuing..."); | |
3943 | } | |
3944 | } | |
3945 | fclose(f); | |
f10fad2f | 3946 | free(line); |
e995d7a2 SH |
3947 | } |
3948 | ||
2322903b SH |
3949 | void lxc_execute_bind_init(struct lxc_conf *conf) |
3950 | { | |
3951 | int ret; | |
9d9c111c SH |
3952 | char path[PATH_MAX], destpath[PATH_MAX], *p; |
3953 | ||
3954 | /* If init exists in the container, don't bind mount a static one */ | |
3955 | p = choose_init(conf->rootfs.mount); | |
3956 | if (p) { | |
3957 | free(p); | |
3958 | return; | |
3959 | } | |
2322903b SH |
3960 | |
3961 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
3962 | if (ret < 0 || ret >= PATH_MAX) { | |
3963 | WARN("Path name too long searching for lxc.init.static"); | |
3964 | return; | |
3965 | } | |
3966 | ||
3967 | if (!file_exists(path)) { | |
3968 | INFO("%s does not exist on host", path); | |
3969 | return; | |
3970 | } | |
3971 | ||
3972 | ret = snprintf(destpath, PATH_MAX, "%s%s", conf->rootfs.mount, "/init.lxc.static"); | |
3973 | if (ret < 0 || ret >= PATH_MAX) { | |
3974 | WARN("Path name too long for container's lxc.init.static"); | |
3975 | return; | |
3976 | } | |
3977 | ||
3978 | if (!file_exists(destpath)) { | |
3979 | FILE * pathfile = fopen(destpath, "wb"); | |
3980 | if (!pathfile) { | |
3981 | SYSERROR("Failed to create mount target '%s'", destpath); | |
3982 | return; | |
3983 | } | |
3984 | fclose(pathfile); | |
3985 | } | |
3986 | ||
592fd47a | 3987 | ret = safe_mount(path, destpath, "none", MS_BIND, NULL, conf->rootfs.mount); |
2322903b SH |
3988 | if (ret < 0) |
3989 | SYSERROR("Failed to bind lxc.init.static into container"); | |
3990 | INFO("lxc.init.static bound into container at %s", path); | |
3991 | } | |
3992 | ||
35120d9c SH |
3993 | /* |
3994 | * This does the work of remounting / if it is shared, calling the | |
3995 | * container pre-mount hooks, and mounting the rootfs. | |
3996 | */ | |
3997 | int do_rootfs_setup(struct lxc_conf *conf, const char *name, const char *lxcpath) | |
0ad19a3f | 3998 | { |
35120d9c SH |
3999 | if (conf->rootfs_setup) { |
4000 | /* | |
4001 | * rootfs was set up in another namespace. bind-mount it | |
4002 | * to give us a mount in our own ns so we can pivot_root to it | |
4003 | */ | |
4004 | const char *path = conf->rootfs.mount; | |
4005 | if (mount(path, path, "rootfs", MS_BIND, NULL) < 0) { | |
4006 | ERROR("Failed to bind-mount container / onto itself"); | |
145832ba | 4007 | return -1; |
35120d9c | 4008 | } |
145832ba | 4009 | return 0; |
35120d9c | 4010 | } |
d4ef7c50 | 4011 | |
e995d7a2 SH |
4012 | remount_all_slave(); |
4013 | ||
35120d9c SH |
4014 | if (run_lxc_hooks(name, "pre-mount", conf, lxcpath, NULL)) { |
4015 | ERROR("failed to run pre-mount hooks for container '%s'.", name); | |
4016 | return -1; | |
4017 | } | |
4018 | ||
9aa76a17 | 4019 | if (lxc_setup_rootfs(conf)) { |
35120d9c SH |
4020 | ERROR("failed to setup rootfs for '%s'", name); |
4021 | return -1; | |
4022 | } | |
4023 | ||
4024 | conf->rootfs_setup = true; | |
4025 | return 0; | |
4026 | } | |
4027 | ||
1c1c7051 SH |
4028 | static bool verify_start_hooks(struct lxc_conf *conf) |
4029 | { | |
4030 | struct lxc_list *it; | |
4031 | char path[MAXPATHLEN]; | |
4032 | lxc_list_for_each(it, &conf->hooks[LXCHOOK_START]) { | |
4033 | char *hookname = it->elem; | |
4034 | struct stat st; | |
4035 | int ret; | |
4036 | ||
4037 | ret = snprintf(path, MAXPATHLEN, "%s%s", | |
7b6753e7 | 4038 | conf->rootfs.path ? conf->rootfs.mount : "", hookname); |
1c1c7051 SH |
4039 | if (ret < 0 || ret >= MAXPATHLEN) |
4040 | return false; | |
4041 | ret = stat(path, &st); | |
4042 | if (ret) { | |
7b6753e7 | 4043 | SYSERROR("Start hook %s not found in container", |
1c1c7051 SH |
4044 | hookname); |
4045 | return false; | |
4046 | } | |
6a0c909a | 4047 | return true; |
1c1c7051 SH |
4048 | } |
4049 | ||
4050 | return true; | |
4051 | } | |
4052 | ||
ae467c54 | 4053 | static int lxc_send_ttys_to_parent(struct lxc_handler *handler) |
e8bd4e43 | 4054 | { |
ae467c54 CB |
4055 | int i; |
4056 | int *ttyfds; | |
4057 | struct lxc_pty_info *pty_info; | |
e8bd4e43 SH |
4058 | struct lxc_conf *conf = handler->conf; |
4059 | const struct lxc_tty_info *tty_info = &conf->tty_info; | |
e8bd4e43 | 4060 | int sock = handler->ttysock[0]; |
ae467c54 CB |
4061 | int ret = -1; |
4062 | size_t num_ttyfds = (2 * conf->tty); | |
e8bd4e43 | 4063 | |
ae467c54 CB |
4064 | ttyfds = malloc(num_ttyfds * sizeof(int)); |
4065 | if (!ttyfds) | |
4066 | return -1; | |
4067 | ||
4068 | for (i = 0; i < num_ttyfds; i++) { | |
4069 | pty_info = &tty_info->pty_info[i / 2]; | |
4070 | ttyfds[i++] = pty_info->slave; | |
4071 | ttyfds[i] = pty_info->master; | |
4072 | TRACE("send pty \"%s\" with master fd %d and slave fd %d to " | |
f07fa8df CB |
4073 | "parent", |
4074 | pty_info->name, pty_info->master, pty_info->slave); | |
e8bd4e43 SH |
4075 | } |
4076 | ||
ae467c54 CB |
4077 | ret = lxc_abstract_unix_send_fds(sock, ttyfds, num_ttyfds, NULL, 0); |
4078 | if (ret < 0) | |
4079 | ERROR("failed to send %d ttys to parent: %s", conf->tty, | |
4080 | strerror(errno)); | |
4081 | else | |
4082 | TRACE("sent %d ttys to parent", conf->tty); | |
4083 | ||
e8bd4e43 SH |
4084 | close(handler->ttysock[0]); |
4085 | close(handler->ttysock[1]); | |
4086 | ||
ae467c54 CB |
4087 | for (i = 0; i < num_ttyfds; i++) |
4088 | close(ttyfds[i]); | |
e8bd4e43 | 4089 | |
ae467c54 CB |
4090 | free(ttyfds); |
4091 | ||
4092 | return ret; | |
e8bd4e43 SH |
4093 | } |
4094 | ||
35120d9c SH |
4095 | int lxc_setup(struct lxc_handler *handler) |
4096 | { | |
4097 | const char *name = handler->name; | |
4098 | struct lxc_conf *lxc_conf = handler->conf; | |
4099 | const char *lxcpath = handler->lxcpath; | |
35120d9c SH |
4100 | |
4101 | if (do_rootfs_setup(lxc_conf, name, lxcpath) < 0) { | |
4102 | ERROR("Error setting up rootfs mount after spawn"); | |
4103 | return -1; | |
4104 | } | |
4105 | ||
6c544cb3 MM |
4106 | if (lxc_conf->inherit_ns_fd[LXC_NS_UTS] == -1) { |
4107 | if (setup_utsname(lxc_conf->utsname)) { | |
4108 | ERROR("failed to setup the utsname for '%s'", name); | |
4109 | return -1; | |
4110 | } | |
0ad19a3f | 4111 | } |
4112 | ||
e337179a CB |
4113 | if (lxc_setup_networks_in_child_namespaces(lxc_conf, |
4114 | &lxc_conf->network)) { | |
36eb9bde | 4115 | ERROR("failed to setup the network for '%s'", name); |
95b5ffaf | 4116 | return -1; |
0ad19a3f | 4117 | } |
4118 | ||
bc6928ff | 4119 | if (lxc_conf->autodev > 0) { |
14221cbb | 4120 | if (mount_autodev(name, &lxc_conf->rootfs, lxcpath)) { |
91c3830e | 4121 | ERROR("failed to mount /dev in the container"); |
c6883f38 SH |
4122 | return -1; |
4123 | } | |
4124 | } | |
4125 | ||
368bbc02 CS |
4126 | /* do automatic mounts (mainly /proc and /sys), but exclude |
4127 | * those that need to wait until other stuff has finished | |
4128 | */ | |
4fb3cba5 | 4129 | if (lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler) < 0) { |
368bbc02 CS |
4130 | ERROR("failed to setup the automatic mounts for '%s'", name); |
4131 | return -1; | |
4132 | } | |
4133 | ||
0a2dddd4 | 4134 | if (setup_mount(&lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath)) { |
36eb9bde | 4135 | ERROR("failed to setup the mounts for '%s'", name); |
95b5ffaf | 4136 | return -1; |
576f946d | 4137 | } |
4138 | ||
0a2dddd4 | 4139 | if (!lxc_list_empty(&lxc_conf->mount_list) && setup_mount_entries(&lxc_conf->rootfs, &lxc_conf->mount_list, name, lxcpath)) { |
e7938e9e MN |
4140 | ERROR("failed to setup the mount entries for '%s'", name); |
4141 | return -1; | |
4142 | } | |
4143 | ||
7b6753e7 | 4144 | /* Make sure any start hooks are in the container */ |
1c1c7051 SH |
4145 | if (!verify_start_hooks(lxc_conf)) |
4146 | return -1; | |
4147 | ||
2322903b SH |
4148 | if (lxc_conf->is_execute) |
4149 | lxc_execute_bind_init(lxc_conf); | |
4150 | ||
368bbc02 CS |
4151 | /* now mount only cgroup, if wanted; |
4152 | * before, /sys could not have been mounted | |
4153 | * (is either mounted automatically or via fstab entries) | |
4154 | */ | |
4fb3cba5 | 4155 | if (lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler) < 0) { |
368bbc02 CS |
4156 | ERROR("failed to setup the automatic mounts for '%s'", name); |
4157 | return -1; | |
4158 | } | |
4159 | ||
283678ed | 4160 | if (run_lxc_hooks(name, "mount", lxc_conf, lxcpath, NULL)) { |
773fb9ca SH |
4161 | ERROR("failed to run mount hooks for container '%s'.", name); |
4162 | return -1; | |
4163 | } | |
4164 | ||
bc6928ff | 4165 | if (lxc_conf->autodev > 0) { |
283678ed | 4166 | if (run_lxc_hooks(name, "autodev", lxc_conf, lxcpath, NULL)) { |
f7bee6c6 MW |
4167 | ERROR("failed to run autodev hooks for container '%s'.", name); |
4168 | return -1; | |
4169 | } | |
27245ff7 | 4170 | if (lxc_fill_autodev(&lxc_conf->rootfs)) { |
91c3830e SH |
4171 | ERROR("failed to populate /dev in the container"); |
4172 | return -1; | |
4173 | } | |
4174 | } | |
368bbc02 | 4175 | |
3d7d929a | 4176 | if (!lxc_conf->is_execute && lxc_setup_console(&lxc_conf->rootfs, &lxc_conf->console, lxc_conf->ttydir)) { |
36eb9bde | 4177 | ERROR("failed to setup the console for '%s'", name); |
95b5ffaf | 4178 | return -1; |
6e590161 | 4179 | } |
4180 | ||
69aa6655 DE |
4181 | if (!lxc_conf->is_execute && setup_dev_symlinks(&lxc_conf->rootfs)) { |
4182 | ERROR("failed to setup /dev symlinks for '%s'", name); | |
4183 | return -1; | |
4184 | } | |
4185 | ||
5112cd70 | 4186 | /* mount /proc if it's not already there */ |
943144d9 | 4187 | if (lxc_create_tmp_proc_mount(lxc_conf) < 0) { |
fe4de9a6 | 4188 | ERROR("failed to LSM mount proc for '%s'", name); |
e075f5d9 | 4189 | return -1; |
e075f5d9 | 4190 | } |
e075f5d9 | 4191 | |
ac778708 | 4192 | if (setup_pivot_root(&lxc_conf->rootfs)) { |
36eb9bde | 4193 | ERROR("failed to set rootfs for '%s'", name); |
95b5ffaf | 4194 | return -1; |
ed502555 | 4195 | } |
4196 | ||
70761e5e | 4197 | if (lxc_setup_devpts(lxc_conf->pts)) { |
36eb9bde | 4198 | ERROR("failed to setup the new pts instance"); |
95b5ffaf | 4199 | return -1; |
3c26f34e | 4200 | } |
4201 | ||
e8bd4e43 SH |
4202 | if (lxc_create_tty(name, lxc_conf)) { |
4203 | ERROR("failed to create the ttys"); | |
4204 | return -1; | |
4205 | } | |
4206 | ||
ae467c54 | 4207 | if (lxc_send_ttys_to_parent(handler) < 0) { |
e8bd4e43 SH |
4208 | ERROR("failure sending console info to parent"); |
4209 | return -1; | |
4210 | } | |
4211 | ||
9e1045e3 | 4212 | if (!lxc_conf->is_execute && lxc_setup_tty(lxc_conf)) { |
e8bd4e43 SH |
4213 | ERROR("failed to setup the ttys for '%s'", name); |
4214 | return -1; | |
4215 | } | |
4216 | ||
4217 | if (lxc_conf->pty_names && setenv("container_ttys", lxc_conf->pty_names, 1)) | |
4218 | SYSERROR("failed to set environment variable for container ptys"); | |
4219 | ||
4220 | ||
cccc74b5 DL |
4221 | if (setup_personality(lxc_conf->personality)) { |
4222 | ERROR("failed to setup personality"); | |
4223 | return -1; | |
4224 | } | |
4225 | ||
97a8f74f SG |
4226 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
4227 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
7389ca26 | 4228 | ERROR("Container requests lxc.cap.drop and lxc.cap.keep: either use lxc.cap.drop or lxc.cap.keep, not both."); |
f6d3e3e4 SH |
4229 | return -1; |
4230 | } | |
97a8f74f SG |
4231 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
4232 | ERROR("failed to keep requested caps"); | |
4233 | return -1; | |
4234 | } | |
4235 | } else if (setup_caps(&lxc_conf->caps)) { | |
4236 | ERROR("failed to drop capabilities"); | |
4237 | return -1; | |
81810dd1 DL |
4238 | } |
4239 | ||
cd54d859 DL |
4240 | NOTICE("'%s' is setup.", name); |
4241 | ||
0ad19a3f | 4242 | return 0; |
4243 | } | |
26ddeedd | 4244 | |
283678ed SH |
4245 | int run_lxc_hooks(const char *name, char *hook, struct lxc_conf *conf, |
4246 | const char *lxcpath, char *argv[]) | |
26ddeedd SH |
4247 | { |
4248 | int which = -1; | |
4249 | struct lxc_list *it; | |
4250 | ||
4251 | if (strcmp(hook, "pre-start") == 0) | |
4252 | which = LXCHOOK_PRESTART; | |
5ea6163a SH |
4253 | else if (strcmp(hook, "pre-mount") == 0) |
4254 | which = LXCHOOK_PREMOUNT; | |
26ddeedd SH |
4255 | else if (strcmp(hook, "mount") == 0) |
4256 | which = LXCHOOK_MOUNT; | |
f7bee6c6 MW |
4257 | else if (strcmp(hook, "autodev") == 0) |
4258 | which = LXCHOOK_AUTODEV; | |
26ddeedd SH |
4259 | else if (strcmp(hook, "start") == 0) |
4260 | which = LXCHOOK_START; | |
52492063 WB |
4261 | else if (strcmp(hook, "stop") == 0) |
4262 | which = LXCHOOK_STOP; | |
26ddeedd SH |
4263 | else if (strcmp(hook, "post-stop") == 0) |
4264 | which = LXCHOOK_POSTSTOP; | |
148e91f5 SH |
4265 | else if (strcmp(hook, "clone") == 0) |
4266 | which = LXCHOOK_CLONE; | |
37cf711b SY |
4267 | else if (strcmp(hook, "destroy") == 0) |
4268 | which = LXCHOOK_DESTROY; | |
26ddeedd SH |
4269 | else |
4270 | return -1; | |
4271 | lxc_list_for_each(it, &conf->hooks[which]) { | |
4272 | int ret; | |
4273 | char *hookname = it->elem; | |
283678ed | 4274 | ret = run_script_argv(name, "lxc", hookname, hook, lxcpath, argv); |
26ddeedd SH |
4275 | if (ret) |
4276 | return ret; | |
4277 | } | |
4278 | return 0; | |
4279 | } | |
72d0e1cb | 4280 | |
72d0e1cb SG |
4281 | int lxc_clear_config_caps(struct lxc_conf *c) |
4282 | { | |
9ebb03ad | 4283 | struct lxc_list *it,*next; |
72d0e1cb | 4284 | |
9ebb03ad | 4285 | lxc_list_for_each_safe(it, &c->caps, next) { |
72d0e1cb SG |
4286 | lxc_list_del(it); |
4287 | free(it->elem); | |
4288 | free(it); | |
4289 | } | |
4290 | return 0; | |
4291 | } | |
4292 | ||
74a3920a | 4293 | static int lxc_free_idmap(struct lxc_list *id_map) { |
27c27d73 SH |
4294 | struct lxc_list *it, *next; |
4295 | ||
4355ab5f | 4296 | lxc_list_for_each_safe(it, id_map, next) { |
27c27d73 SH |
4297 | lxc_list_del(it); |
4298 | free(it->elem); | |
4299 | free(it); | |
4300 | } | |
4301 | return 0; | |
4302 | } | |
4303 | ||
4355ab5f SH |
4304 | int lxc_clear_idmaps(struct lxc_conf *c) |
4305 | { | |
4306 | return lxc_free_idmap(&c->id_map); | |
4307 | } | |
4308 | ||
1fb86a7c SH |
4309 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
4310 | { | |
4311 | struct lxc_list *it,*next; | |
4312 | ||
4313 | lxc_list_for_each_safe(it, &c->keepcaps, next) { | |
4314 | lxc_list_del(it); | |
4315 | free(it->elem); | |
4316 | free(it); | |
4317 | } | |
4318 | return 0; | |
4319 | } | |
4320 | ||
12a50cc6 | 4321 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key) |
72d0e1cb | 4322 | { |
9ebb03ad | 4323 | struct lxc_list *it,*next; |
72d0e1cb | 4324 | bool all = false; |
a6390f01 | 4325 | const char *k = NULL; |
72d0e1cb SG |
4326 | |
4327 | if (strcmp(key, "lxc.cgroup") == 0) | |
4328 | all = true; | |
a6390f01 WB |
4329 | else if (strncmp(key, "lxc.cgroup.", sizeof("lxc.cgroup.")-1) == 0) |
4330 | k = key + sizeof("lxc.cgroup.")-1; | |
4331 | else | |
4332 | return -1; | |
72d0e1cb | 4333 | |
9ebb03ad | 4334 | lxc_list_for_each_safe(it, &c->cgroup, next) { |
72d0e1cb SG |
4335 | struct lxc_cgroup *cg = it->elem; |
4336 | if (!all && strcmp(cg->subsystem, k) != 0) | |
4337 | continue; | |
4338 | lxc_list_del(it); | |
4339 | free(cg->subsystem); | |
4340 | free(cg->value); | |
4341 | free(cg); | |
4342 | free(it); | |
4343 | } | |
4344 | return 0; | |
4345 | } | |
4346 | ||
c6d09e15 WB |
4347 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
4348 | { | |
4349 | struct lxc_list *it, *next; | |
4350 | bool all = false; | |
4351 | const char *k = NULL; | |
4352 | ||
4353 | if (strcmp(key, "lxc.limit") == 0) | |
4354 | all = true; | |
4355 | else if (strncmp(key, "lxc.limit.", sizeof("lxc.limit.")-1) == 0) | |
4356 | k = key + sizeof("lxc.limit.")-1; | |
4357 | else | |
4358 | return -1; | |
4359 | ||
4360 | lxc_list_for_each_safe(it, &c->limits, next) { | |
4361 | struct lxc_limit *lim = it->elem; | |
4362 | if (!all && strcmp(lim->resource, k) != 0) | |
4363 | continue; | |
4364 | lxc_list_del(it); | |
4365 | free(lim->resource); | |
4366 | free(lim); | |
4367 | free(it); | |
4368 | } | |
4369 | return 0; | |
4370 | } | |
4371 | ||
ee1e7aa0 SG |
4372 | int lxc_clear_groups(struct lxc_conf *c) |
4373 | { | |
4374 | struct lxc_list *it,*next; | |
4375 | ||
4376 | lxc_list_for_each_safe(it, &c->groups, next) { | |
4377 | lxc_list_del(it); | |
4378 | free(it->elem); | |
4379 | free(it); | |
4380 | } | |
4381 | return 0; | |
4382 | } | |
4383 | ||
ab799c0b SG |
4384 | int lxc_clear_environment(struct lxc_conf *c) |
4385 | { | |
4386 | struct lxc_list *it,*next; | |
4387 | ||
4388 | lxc_list_for_each_safe(it, &c->environment, next) { | |
4389 | lxc_list_del(it); | |
4390 | free(it->elem); | |
4391 | free(it); | |
4392 | } | |
4393 | return 0; | |
4394 | } | |
4395 | ||
4396 | ||
72d0e1cb SG |
4397 | int lxc_clear_mount_entries(struct lxc_conf *c) |
4398 | { | |
9ebb03ad | 4399 | struct lxc_list *it,*next; |
72d0e1cb | 4400 | |
9ebb03ad | 4401 | lxc_list_for_each_safe(it, &c->mount_list, next) { |
72d0e1cb SG |
4402 | lxc_list_del(it); |
4403 | free(it->elem); | |
4404 | free(it); | |
4405 | } | |
4406 | return 0; | |
4407 | } | |
4408 | ||
b099e9e9 SH |
4409 | int lxc_clear_automounts(struct lxc_conf *c) |
4410 | { | |
4411 | c->auto_mounts = 0; | |
4412 | return 0; | |
4413 | } | |
4414 | ||
12a50cc6 | 4415 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 4416 | { |
9ebb03ad | 4417 | struct lxc_list *it,*next; |
17ed13a3 | 4418 | bool all = false, done = false; |
a6390f01 | 4419 | const char *k = NULL; |
72d0e1cb SG |
4420 | int i; |
4421 | ||
17ed13a3 SH |
4422 | if (strcmp(key, "lxc.hook") == 0) |
4423 | all = true; | |
a6390f01 WB |
4424 | else if (strncmp(key, "lxc.hook.", sizeof("lxc.hook.")-1) == 0) |
4425 | k = key + sizeof("lxc.hook.")-1; | |
4426 | else | |
4427 | return -1; | |
17ed13a3 | 4428 | |
72d0e1cb | 4429 | for (i=0; i<NUM_LXC_HOOKS; i++) { |
17ed13a3 | 4430 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
9ebb03ad | 4431 | lxc_list_for_each_safe(it, &c->hooks[i], next) { |
17ed13a3 SH |
4432 | lxc_list_del(it); |
4433 | free(it->elem); | |
4434 | free(it); | |
4435 | } | |
4436 | done = true; | |
72d0e1cb SG |
4437 | } |
4438 | } | |
17ed13a3 SH |
4439 | |
4440 | if (!done) { | |
4441 | ERROR("Invalid hook key: %s", key); | |
4442 | return -1; | |
4443 | } | |
72d0e1cb SG |
4444 | return 0; |
4445 | } | |
8eb5694b | 4446 | |
74a3920a | 4447 | static void lxc_clear_saved_nics(struct lxc_conf *conf) |
7b35f3d6 SH |
4448 | { |
4449 | int i; | |
4450 | ||
0cf45501 | 4451 | if (!conf->saved_nics) |
7b35f3d6 SH |
4452 | return; |
4453 | for (i=0; i < conf->num_savednics; i++) | |
4454 | free(conf->saved_nics[i].orig_name); | |
7b35f3d6 SH |
4455 | free(conf->saved_nics); |
4456 | } | |
4457 | ||
4184c3e1 SH |
4458 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
4459 | { | |
4460 | struct lxc_list *it,*next; | |
4461 | ||
4462 | lxc_list_for_each_safe(it, &conf->aliens, next) { | |
4463 | lxc_list_del(it); | |
4464 | free(it->elem); | |
4465 | free(it); | |
4466 | } | |
4467 | } | |
4468 | ||
c7b15d1e | 4469 | void lxc_clear_includes(struct lxc_conf *conf) |
f979ac15 SH |
4470 | { |
4471 | struct lxc_list *it,*next; | |
4472 | ||
4473 | lxc_list_for_each_safe(it, &conf->includes, next) { | |
4474 | lxc_list_del(it); | |
4475 | free(it->elem); | |
4476 | free(it); | |
4477 | } | |
4478 | } | |
4479 | ||
8eb5694b SH |
4480 | void lxc_conf_free(struct lxc_conf *conf) |
4481 | { | |
4482 | if (!conf) | |
4483 | return; | |
858377e4 SH |
4484 | if (current_config == conf) |
4485 | current_config = NULL; | |
f10fad2f ME |
4486 | free(conf->console.log_path); |
4487 | free(conf->console.path); | |
4488 | free(conf->rootfs.mount); | |
b3b8c97f | 4489 | free(conf->rootfs.bdev_type); |
f10fad2f ME |
4490 | free(conf->rootfs.options); |
4491 | free(conf->rootfs.path); | |
f10fad2f | 4492 | free(conf->logfile); |
858377e4 SH |
4493 | if (conf->logfd != -1) |
4494 | close(conf->logfd); | |
f10fad2f ME |
4495 | free(conf->utsname); |
4496 | free(conf->ttydir); | |
4497 | free(conf->fstab); | |
4498 | free(conf->rcfile); | |
4499 | free(conf->init_cmd); | |
6b0d5538 | 4500 | free(conf->unexpanded_config); |
393903d1 | 4501 | free(conf->pty_names); |
76d0127f | 4502 | free(conf->syslog); |
c302b476 | 4503 | lxc_free_networks(&conf->network); |
f10fad2f ME |
4504 | free(conf->lsm_aa_profile); |
4505 | free(conf->lsm_se_context); | |
769872f9 | 4506 | lxc_seccomp_free(conf); |
8eb5694b | 4507 | lxc_clear_config_caps(conf); |
1fb86a7c | 4508 | lxc_clear_config_keepcaps(conf); |
8eb5694b | 4509 | lxc_clear_cgroups(conf, "lxc.cgroup"); |
17ed13a3 | 4510 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 4511 | lxc_clear_mount_entries(conf); |
7b35f3d6 | 4512 | lxc_clear_saved_nics(conf); |
27c27d73 | 4513 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 4514 | lxc_clear_groups(conf); |
f979ac15 | 4515 | lxc_clear_includes(conf); |
761d81ca | 4516 | lxc_clear_aliens(conf); |
ab799c0b | 4517 | lxc_clear_environment(conf); |
c6d09e15 | 4518 | lxc_clear_limits(conf, "lxc.limit"); |
8eb5694b SH |
4519 | free(conf); |
4520 | } | |
4355ab5f SH |
4521 | |
4522 | struct userns_fn_data { | |
4523 | int (*fn)(void *); | |
c9b7c33e | 4524 | const char *fn_name; |
4355ab5f SH |
4525 | void *arg; |
4526 | int p[2]; | |
4527 | }; | |
4528 | ||
4529 | static int run_userns_fn(void *data) | |
4530 | { | |
4531 | struct userns_fn_data *d = data; | |
4532 | char c; | |
4355ab5f | 4533 | |
f8aa4bf3 | 4534 | /* Close write end of the pipe. */ |
4355ab5f | 4535 | close(d->p[1]); |
f8aa4bf3 CB |
4536 | |
4537 | /* Wait for parent to finish establishing a new mapping in the user | |
4538 | * namespace we are executing in. | |
4539 | */ | |
4355ab5f SH |
4540 | if (read(d->p[0], &c, 1) != 1) |
4541 | return -1; | |
f8aa4bf3 CB |
4542 | |
4543 | /* Close read end of the pipe. */ | |
4355ab5f | 4544 | close(d->p[0]); |
f8aa4bf3 | 4545 | |
c9b7c33e CB |
4546 | if (d->fn_name) |
4547 | TRACE("calling function \"%s\"", d->fn_name); | |
f8aa4bf3 | 4548 | /* Call function to run. */ |
4355ab5f SH |
4549 | return d->fn(d->arg); |
4550 | } | |
4551 | ||
339efad9 | 4552 | static struct id_map *mapped_hostid_entry(struct lxc_conf *conf, unsigned id, |
f8aa4bf3 CB |
4553 | enum idtype idtype) |
4554 | { | |
4555 | struct lxc_list *it; | |
4556 | struct id_map *map; | |
4557 | struct id_map *retmap = NULL; | |
4558 | ||
4559 | lxc_list_for_each(it, &conf->id_map) { | |
4560 | map = it->elem; | |
4561 | if (map->idtype != idtype) | |
4562 | continue; | |
4563 | ||
4564 | if (id >= map->hostid && id < map->hostid + map->range) { | |
4565 | retmap = map; | |
4566 | break; | |
4567 | } | |
4568 | } | |
4569 | ||
4570 | if (!retmap) | |
4571 | return NULL; | |
4572 | ||
4573 | retmap = malloc(sizeof(*retmap)); | |
4574 | if (!retmap) | |
4575 | return NULL; | |
4576 | ||
4577 | memcpy(retmap, map, sizeof(*retmap)); | |
4578 | return retmap; | |
4579 | } | |
4580 | ||
4355ab5f | 4581 | /* |
f8aa4bf3 CB |
4582 | * Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
4583 | * existing one or establish a new one. | |
4355ab5f | 4584 | */ |
28a2d9e7 | 4585 | static struct id_map *idmap_add(struct lxc_conf *conf, uid_t id, enum idtype type) |
4355ab5f | 4586 | { |
28a2d9e7 | 4587 | int hostid_mapped; |
f8aa4bf3 | 4588 | struct id_map *entry = NULL; |
f8aa4bf3 | 4589 | |
28a2d9e7 CB |
4590 | /* Reuse existing mapping. */ |
4591 | entry = mapped_hostid_entry(conf, id, type); | |
4592 | if (entry) | |
4593 | return entry; | |
f8aa4bf3 | 4594 | |
28a2d9e7 CB |
4595 | /* Find new mapping. */ |
4596 | hostid_mapped = find_unmapped_nsid(conf, type); | |
4597 | if (hostid_mapped < 0) { | |
4598 | DEBUG("failed to find free mapping for id %d", id); | |
4599 | return NULL; | |
f8aa4bf3 | 4600 | } |
f8aa4bf3 | 4601 | |
28a2d9e7 CB |
4602 | entry = malloc(sizeof(*entry)); |
4603 | if (!entry) | |
4604 | return NULL; | |
4355ab5f | 4605 | |
28a2d9e7 CB |
4606 | entry->idtype = type; |
4607 | entry->nsid = hostid_mapped; | |
4608 | entry->hostid = (unsigned long)id; | |
4609 | entry->range = 1; | |
4355ab5f | 4610 | |
28a2d9e7 | 4611 | return entry; |
4355ab5f SH |
4612 | } |
4613 | ||
f8aa4bf3 CB |
4614 | /* Run a function in a new user namespace. |
4615 | * The caller's euid/egid will be mapped if it is not already. | |
4616 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
4617 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
4618 | * This means we require only to establish a mapping from: | |
4619 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
4620 | * - the container root -> some sub{g,u}id | |
4621 | * The former we add, if the user did not specifiy a mapping. The latter we | |
4622 | * retrieve from the ontainer's configured {g,u}id mappings as it must have been | |
4623 | * there to start the container in the first place. | |
4355ab5f | 4624 | */ |
c9b7c33e CB |
4625 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data, |
4626 | const char *fn_name) | |
4355ab5f | 4627 | { |
f8aa4bf3 CB |
4628 | pid_t pid; |
4629 | uid_t euid, egid; | |
4355ab5f | 4630 | struct userns_fn_data d; |
4355ab5f | 4631 | int p[2]; |
f8aa4bf3 CB |
4632 | struct lxc_list *it; |
4633 | struct id_map *map; | |
4634 | char c = '1'; | |
4635 | int ret = -1; | |
4636 | struct lxc_list *idmap = NULL, *tmplist = NULL; | |
28a2d9e7 CB |
4637 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, |
4638 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4355ab5f | 4639 | |
4355ab5f | 4640 | ret = pipe(p); |
4355ab5f SH |
4641 | if (ret < 0) { |
4642 | SYSERROR("opening pipe"); | |
4643 | return -1; | |
4644 | } | |
4645 | d.fn = fn; | |
c9b7c33e | 4646 | d.fn_name = fn_name; |
4355ab5f SH |
4647 | d.arg = data; |
4648 | d.p[0] = p[0]; | |
4649 | d.p[1] = p[1]; | |
f8aa4bf3 CB |
4650 | |
4651 | /* Clone child in new user namespace. */ | |
4355ab5f | 4652 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER); |
f8aa4bf3 CB |
4653 | if (pid < 0) { |
4654 | ERROR("failed to clone child process in new user namespace"); | |
4655 | goto on_error; | |
4656 | } | |
4657 | ||
4355ab5f | 4658 | close(p[0]); |
4355ab5f SH |
4659 | p[0] = -1; |
4660 | ||
f8aa4bf3 CB |
4661 | /* Find container root. */ |
4662 | lxc_list_for_each(it, &conf->id_map) { | |
4663 | map = it->elem; | |
4664 | ||
4665 | if (map->nsid != 0) | |
4666 | continue; | |
4667 | ||
4668 | if (map->idtype == ID_TYPE_UID && container_root_uid == NULL) { | |
4669 | container_root_uid = malloc(sizeof(*container_root_uid)); | |
4670 | if (!container_root_uid) | |
4671 | goto on_error; | |
4672 | container_root_uid->idtype = map->idtype; | |
4673 | container_root_uid->hostid = map->hostid; | |
4674 | container_root_uid->nsid = 0; | |
4675 | container_root_uid->range = map->range; | |
4676 | } else if (map->idtype == ID_TYPE_GID && container_root_gid == NULL) { | |
4677 | container_root_gid = malloc(sizeof(*container_root_gid)); | |
4678 | if (!container_root_gid) | |
4679 | goto on_error; | |
4680 | container_root_gid->idtype = map->idtype; | |
4681 | container_root_gid->hostid = map->hostid; | |
4682 | container_root_gid->nsid = 0; | |
4683 | container_root_gid->range = map->range; | |
4684 | } | |
4685 | ||
4686 | /* Found container root. */ | |
4687 | if (container_root_uid && container_root_gid) | |
4688 | break; | |
4689 | } | |
4690 | ||
4691 | /* This is actually checked earlier but it can't hurt. */ | |
4692 | if (!container_root_uid || !container_root_gid) { | |
4693 | ERROR("no mapping for container root found"); | |
4694 | goto on_error; | |
4695 | } | |
4696 | ||
1d90e064 CB |
4697 | host_uid_map = container_root_uid; |
4698 | host_gid_map = container_root_gid; | |
4699 | ||
f8aa4bf3 CB |
4700 | /* Check whether the {g,u}id of the user has a mapping. */ |
4701 | euid = geteuid(); | |
4702 | egid = getegid(); | |
1d90e064 | 4703 | if (euid != container_root_uid->hostid) |
28a2d9e7 CB |
4704 | host_uid_map = idmap_add(conf, euid, ID_TYPE_UID); |
4705 | ||
1d90e064 | 4706 | if (egid != container_root_gid->hostid) |
28a2d9e7 CB |
4707 | host_gid_map = idmap_add(conf, egid, ID_TYPE_GID); |
4708 | ||
4709 | if (!host_uid_map) { | |
4710 | DEBUG("failed to find mapping for uid %d", euid); | |
f8aa4bf3 CB |
4711 | goto on_error; |
4712 | } | |
4713 | ||
28a2d9e7 CB |
4714 | if (!host_gid_map) { |
4715 | DEBUG("failed to find mapping for gid %d", egid); | |
4716 | goto on_error; | |
4717 | } | |
4718 | ||
4719 | /* Allocate new {g,u}id map list. */ | |
4720 | idmap = malloc(sizeof(*idmap)); | |
4721 | if (!idmap) | |
4722 | goto on_error; | |
4723 | lxc_list_init(idmap); | |
4724 | ||
f8aa4bf3 CB |
4725 | /* Add container root to the map. */ |
4726 | tmplist = malloc(sizeof(*tmplist)); | |
4727 | if (!tmplist) | |
4728 | goto on_error; | |
4729 | lxc_list_add_elem(tmplist, container_root_uid); | |
4730 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4731 | |
1d90e064 | 4732 | if (host_uid_map && (host_uid_map != container_root_uid)) { |
28a2d9e7 CB |
4733 | /* idmap will now keep track of that memory. */ |
4734 | container_root_uid = NULL; | |
4735 | ||
4736 | /* Add container root to the map. */ | |
4737 | tmplist = malloc(sizeof(*tmplist)); | |
4738 | if (!tmplist) | |
4739 | goto on_error; | |
4740 | lxc_list_add_elem(tmplist, host_uid_map); | |
4741 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4742 | } |
1d90e064 CB |
4743 | /* idmap will now keep track of that memory. */ |
4744 | container_root_uid = NULL; | |
4745 | /* idmap will now keep track of that memory. */ | |
4746 | host_uid_map = NULL; | |
f8aa4bf3 CB |
4747 | |
4748 | tmplist = malloc(sizeof(*tmplist)); | |
4749 | if (!tmplist) | |
4750 | goto on_error; | |
4751 | lxc_list_add_elem(tmplist, container_root_gid); | |
4752 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4753 | |
1d90e064 | 4754 | if (host_gid_map && (host_gid_map != container_root_gid)) { |
28a2d9e7 CB |
4755 | /* idmap will now keep track of that memory. */ |
4756 | container_root_gid = NULL; | |
4757 | ||
4758 | tmplist = malloc(sizeof(*tmplist)); | |
4759 | if (!tmplist) | |
4760 | goto on_error; | |
4761 | lxc_list_add_elem(tmplist, host_gid_map); | |
4762 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 4763 | } |
1d90e064 CB |
4764 | /* idmap will now keep track of that memory. */ |
4765 | container_root_gid = NULL; | |
4766 | /* idmap will now keep track of that memory. */ | |
4767 | host_gid_map = NULL; | |
f8aa4bf3 | 4768 | |
4b73005c CB |
4769 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || |
4770 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
f8aa4bf3 CB |
4771 | lxc_list_for_each(it, idmap) { |
4772 | map = it->elem; | |
4773 | TRACE("establishing %cid mapping for \"%d\" in new " | |
4774 | "user namespace: nsuid %lu - hostid %lu - range " | |
4775 | "%lu", | |
4776 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4777 | map->nsid, map->hostid, map->range); | |
4778 | } | |
4355ab5f SH |
4779 | } |
4780 | ||
f8aa4bf3 | 4781 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 4782 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 CB |
4783 | if (ret < 0) { |
4784 | ERROR("error setting up {g,u}id mappings for child process " | |
4785 | "\"%d\"", | |
4786 | pid); | |
4787 | goto on_error; | |
4355ab5f SH |
4788 | } |
4789 | ||
f8aa4bf3 | 4790 | /* Tell child to proceed. */ |
4355ab5f | 4791 | if (write(p[1], &c, 1) != 1) { |
f8aa4bf3 CB |
4792 | SYSERROR("failed telling child process \"%d\" to proceed", pid); |
4793 | goto on_error; | |
4355ab5f SH |
4794 | } |
4795 | ||
f8aa4bf3 | 4796 | /* Wait for child to finish. */ |
3139aead SG |
4797 | ret = wait_for_pid(pid); |
4798 | ||
f8aa4bf3 | 4799 | on_error: |
1d90e064 CB |
4800 | if (idmap) |
4801 | lxc_free_idmap(idmap); | |
4802 | if (container_root_uid) | |
4803 | free(container_root_uid); | |
4804 | if (container_root_gid) | |
4805 | free(container_root_gid); | |
4806 | if (host_uid_map && (host_uid_map != container_root_uid)) | |
4807 | free(host_uid_map); | |
4808 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4809 | free(host_gid_map); | |
3139aead | 4810 | |
4355ab5f SH |
4811 | if (p[0] != -1) |
4812 | close(p[0]); | |
4813 | close(p[1]); | |
f8aa4bf3 CB |
4814 | |
4815 | return ret; | |
4355ab5f | 4816 | } |
97e9cfa0 | 4817 | |
a96a8e8c | 4818 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4819 | static char* getuname(void) |
4820 | { | |
a96a8e8c | 4821 | struct passwd *result; |
97e9cfa0 | 4822 | |
a96a8e8c SH |
4823 | result = getpwuid(geteuid()); |
4824 | if (!result) | |
97e9cfa0 SH |
4825 | return NULL; |
4826 | ||
a96a8e8c | 4827 | return strdup(result->pw_name); |
97e9cfa0 SH |
4828 | } |
4829 | ||
a96a8e8c | 4830 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4831 | static char *getgname(void) |
4832 | { | |
a96a8e8c | 4833 | struct group *result; |
97e9cfa0 | 4834 | |
a96a8e8c SH |
4835 | result = getgrgid(getegid()); |
4836 | if (!result) | |
97e9cfa0 SH |
4837 | return NULL; |
4838 | ||
a96a8e8c | 4839 | return strdup(result->gr_name); |
97e9cfa0 SH |
4840 | } |
4841 | ||
a96a8e8c | 4842 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4843 | void suggest_default_idmap(void) |
4844 | { | |
4845 | FILE *f; | |
4846 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; | |
4847 | char *line = NULL; | |
4848 | char *uname, *gname; | |
4849 | size_t len = 0; | |
4850 | ||
4851 | if (!(uname = getuname())) | |
4852 | return; | |
4853 | ||
4854 | if (!(gname = getgname())) { | |
4855 | free(uname); | |
4856 | return; | |
4857 | } | |
4858 | ||
4859 | f = fopen(subuidfile, "r"); | |
4860 | if (!f) { | |
4861 | ERROR("Your system is not configured with subuids"); | |
4862 | free(gname); | |
4863 | free(uname); | |
4864 | return; | |
4865 | } | |
4866 | while (getline(&line, &len, f) != -1) { | |
b7930180 | 4867 | size_t no_newline = 0; |
97e9cfa0 SH |
4868 | char *p = strchr(line, ':'), *p2; |
4869 | if (*line == '#') | |
4870 | continue; | |
4871 | if (!p) | |
4872 | continue; | |
4873 | *p = '\0'; | |
4874 | p++; | |
4875 | if (strcmp(line, uname)) | |
4876 | continue; | |
4877 | p2 = strchr(p, ':'); | |
4878 | if (!p2) | |
4879 | continue; | |
4880 | *p2 = '\0'; | |
4881 | p2++; | |
4882 | if (!*p2) | |
4883 | continue; | |
b7930180 CB |
4884 | no_newline = strcspn(p2, "\n"); |
4885 | p2[no_newline] = '\0'; | |
4886 | ||
b7b2fde4 CB |
4887 | if (lxc_safe_uint(p, &uid) < 0) |
4888 | WARN("Could not parse UID."); | |
4889 | if (lxc_safe_uint(p2, &urange) < 0) | |
4890 | WARN("Could not parse UID range."); | |
97e9cfa0 SH |
4891 | } |
4892 | fclose(f); | |
4893 | ||
6be7389a | 4894 | f = fopen(subgidfile, "r"); |
97e9cfa0 SH |
4895 | if (!f) { |
4896 | ERROR("Your system is not configured with subgids"); | |
4897 | free(gname); | |
4898 | free(uname); | |
4899 | return; | |
4900 | } | |
4901 | while (getline(&line, &len, f) != -1) { | |
b7930180 | 4902 | size_t no_newline = 0; |
97e9cfa0 SH |
4903 | char *p = strchr(line, ':'), *p2; |
4904 | if (*line == '#') | |
4905 | continue; | |
4906 | if (!p) | |
4907 | continue; | |
4908 | *p = '\0'; | |
4909 | p++; | |
4910 | if (strcmp(line, uname)) | |
4911 | continue; | |
4912 | p2 = strchr(p, ':'); | |
4913 | if (!p2) | |
4914 | continue; | |
4915 | *p2 = '\0'; | |
4916 | p2++; | |
4917 | if (!*p2) | |
4918 | continue; | |
b7930180 CB |
4919 | no_newline = strcspn(p2, "\n"); |
4920 | p2[no_newline] = '\0'; | |
4921 | ||
b7b2fde4 CB |
4922 | if (lxc_safe_uint(p, &gid) < 0) |
4923 | WARN("Could not parse GID."); | |
4924 | if (lxc_safe_uint(p2, &grange) < 0) | |
4925 | WARN("Could not parse GID range."); | |
97e9cfa0 SH |
4926 | } |
4927 | fclose(f); | |
4928 | ||
f10fad2f | 4929 | free(line); |
97e9cfa0 SH |
4930 | |
4931 | if (!urange || !grange) { | |
4932 | ERROR("You do not have subuids or subgids allocated"); | |
4933 | ERROR("Unprivileged containers require subuids and subgids"); | |
4934 | return; | |
4935 | } | |
4936 | ||
4937 | ERROR("You must either run as root, or define uid mappings"); | |
4938 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4939 | ERROR("~/.config/lxc/default.conf:"); | |
4940 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
4941 | ERROR("lxc.id_map = u 0 %u %u", uid, urange); | |
4942 | ERROR("lxc.id_map = g 0 %u %u", gid, grange); | |
4943 | ||
4944 | free(gname); | |
4945 | free(uname); | |
4946 | } | |
aaf26830 | 4947 | |
a7307747 SH |
4948 | static void free_cgroup_settings(struct lxc_list *result) |
4949 | { | |
4950 | struct lxc_list *iterator, *next; | |
4951 | ||
4952 | lxc_list_for_each_safe(iterator, result, next) { | |
4953 | lxc_list_del(iterator); | |
4954 | free(iterator); | |
4955 | } | |
4956 | free(result); | |
4957 | } | |
4958 | ||
aaf26830 KT |
4959 | /* |
4960 | * Return the list of cgroup_settings sorted according to the following rules | |
4961 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes | |
4962 | */ | |
4963 | struct lxc_list *sort_cgroup_settings(struct lxc_list* cgroup_settings) | |
4964 | { | |
4965 | struct lxc_list *result; | |
4966 | struct lxc_list *memsw_limit = NULL; | |
4967 | struct lxc_list *it = NULL; | |
4968 | struct lxc_cgroup *cg = NULL; | |
4969 | struct lxc_list *item = NULL; | |
4970 | ||
4971 | result = malloc(sizeof(*result)); | |
fac7c663 KT |
4972 | if (!result) { |
4973 | ERROR("failed to allocate memory to sort cgroup settings"); | |
4974 | return NULL; | |
4975 | } | |
aaf26830 KT |
4976 | lxc_list_init(result); |
4977 | ||
4978 | /*Iterate over the cgroup settings and copy them to the output list*/ | |
4979 | lxc_list_for_each(it, cgroup_settings) { | |
4980 | item = malloc(sizeof(*item)); | |
fac7c663 KT |
4981 | if (!item) { |
4982 | ERROR("failed to allocate memory to sort cgroup settings"); | |
a7307747 | 4983 | free_cgroup_settings(result); |
fac7c663 KT |
4984 | return NULL; |
4985 | } | |
aaf26830 KT |
4986 | item->elem = it->elem; |
4987 | cg = it->elem; | |
4988 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
4989 | /* Store the memsw_limit location */ | |
4990 | memsw_limit = item; | |
4991 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && memsw_limit != NULL) { | |
4d5b72a1 | 4992 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found before |
aaf26830 KT |
4993 | * lxc.cgroup.memory.limit_in_bytes, swap these two items */ |
4994 | item->elem = memsw_limit->elem; | |
4995 | memsw_limit->elem = it->elem; | |
4996 | } | |
4997 | lxc_list_add_tail(result, item); | |
4998 | } | |
4999 | ||
5000 | return result; | |
a7307747 | 5001 | } |