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Commit | Line | Data |
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cc73685d | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
e0732705 | 2 | |
d38dd64a CB |
3 | #ifndef _GNU_SOURCE |
4 | #define _GNU_SOURCE 1 | |
5 | #endif | |
e0732705 CS |
6 | #include <errno.h> |
7 | #include <fcntl.h> | |
c476bdce | 8 | #include <grp.h> |
604ca1c0 | 9 | #include <linux/unistd.h> |
6f4f1937 | 10 | #include <pwd.h> |
0bece477 | 11 | #include <pthread.h> |
6f4f1937 CB |
12 | #include <signal.h> |
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <string.h> | |
6f4f1937 | 16 | #include <sys/mount.h> |
e0732705 CS |
17 | #include <sys/param.h> |
18 | #include <sys/prctl.h> | |
5ec27989 | 19 | #include <sys/socket.h> |
1ba0013f | 20 | #include <sys/syscall.h> |
905022f7 | 21 | #include <sys/wait.h> |
604ca1c0 CB |
22 | #include <termios.h> |
23 | #include <unistd.h> | |
6f4f1937 CB |
24 | |
25 | #include <lxc/lxccontainer.h> | |
e0732705 | 26 | |
81f466d0 | 27 | #include "af_unix.h" |
e0732705 CS |
28 | #include "attach.h" |
29 | #include "caps.h" | |
c988c8b1 CB |
30 | #include "cgroups/cgroup.h" |
31 | #include "cgroups/cgroup_utils.h" | |
6f4f1937 | 32 | #include "commands.h" |
2c4ea790 | 33 | #include "conf.h" |
6f4f1937 | 34 | #include "config.h" |
9b8e3c96 | 35 | #include "confile.h" |
6f4f1937 CB |
36 | #include "log.h" |
37 | #include "lsm/lsm.h" | |
38 | #include "lxclock.h" | |
39 | #include "lxcseccomp.h" | |
604ca1c0 | 40 | #include "macro.h" |
ba2be1a8 | 41 | #include "mainloop.h" |
cd8f5663 | 42 | #include "memory_utils.h" |
657256e0 | 43 | #include "mount_utils.h" |
6f4f1937 | 44 | #include "namespace.h" |
f40988c7 | 45 | #include "process_utils.h" |
a9f0cecf | 46 | #include "sync.h" |
59524108 | 47 | #include "syscall_wrappers.h" |
0ed9b1bc | 48 | #include "terminal.h" |
6f4f1937 | 49 | #include "utils.h" |
9c4693b8 | 50 | |
ac2cecc4 | 51 | lxc_log_define(attach, lxc); |
e0732705 | 52 | |
ef05d368 CB |
53 | /* Define default options if no options are supplied by the user. */ |
54 | static lxc_attach_options_t attach_static_default_options = LXC_ATTACH_OPTIONS_DEFAULT; | |
55 | ||
20718e39 CB |
56 | /* |
57 | * The context used to attach to the container. | |
3ac4480a CB |
58 | * @attach_flags : the attach flags specified in lxc_attach_options_t |
59 | * @init_pid : the PID of the container's init process | |
60 | * @dfd_init_pid : file descriptor to /proc/@init_pid | |
61 | * __Must be closed in attach_context_security_barrier()__! | |
62 | * @dfd_self_pid : file descriptor to /proc/self | |
63 | * __Must be closed in attach_context_security_barrier()__! | |
64 | * @setup_ns_uid : if CLONE_NEWUSER is specified will contain the uid used | |
65 | * during attach setup. | |
66 | * @setup_ns_gid : if CLONE_NEWUSER is specified will contain the gid used | |
67 | * during attach setup. | |
68 | * @target_ns_uid : if CLONE_NEWUSER is specified the uid that the final | |
69 | * program will be run with. | |
70 | * @target_ns_gid : if CLONE_NEWUSER is specified the gid that the final | |
71 | * program will be run with. | |
72 | * @target_host_uid : if CLONE_NEWUSER is specified the uid that the final | |
73 | * program will be run with on the host. | |
74 | * @target_host_gid : if CLONE_NEWUSER is specified the gid that the final | |
75 | * program will be run with on the host. | |
76 | * @lsm_label : LSM label to be used for the attaching process | |
77 | * @container : the container we're attaching o | |
78 | * @personality : the personality to use for the final program | |
79 | * @capability : the capability mask of the @init_pid | |
80 | * @ns_inherited : flags of namespaces that the final program will inherit | |
81 | * from @init_pid | |
82 | * @ns_fd : file descriptors to @init_pid's namespaces | |
20718e39 | 83 | */ |
ab919e5f | 84 | struct attach_context { |
afc691a0 | 85 | unsigned int attach_flags; |
500ed813 | 86 | int init_pid; |
9b31ab58 | 87 | int init_pidfd; |
25c659d5 CB |
88 | int dfd_init_pid; |
89 | int dfd_self_pid; | |
3ac4480a CB |
90 | uid_t setup_ns_uid; |
91 | gid_t setup_ns_gid; | |
92 | uid_t target_ns_uid; | |
93 | gid_t target_ns_gid; | |
94 | uid_t target_host_uid; | |
95 | uid_t target_host_gid; | |
0e304baa CB |
96 | char *lsm_label; |
97 | struct lxc_container *container; | |
64a04c84 | 98 | personality_t personality; |
0e304baa CB |
99 | unsigned long long capability_mask; |
100 | int ns_inherited; | |
101 | int ns_fd[LXC_NS_MAX]; | |
102 | struct lsm_ops *lsm_ops; | |
103 | }; | |
104 | ||
6f0c2cea | 105 | static pid_t pidfd_get_pid(int dfd_init_pid, int pidfd) |
d8764025 CB |
106 | { |
107 | __do_free char *line = NULL; | |
108 | __do_fclose FILE *f = NULL; | |
109 | size_t len = 0; | |
6f0c2cea | 110 | char path[STRLITERALLEN("fdinfo/") + INTTYPE_TO_STRLEN(int) + 1 ] = "fdinfo/"; |
d8764025 CB |
111 | int ret; |
112 | ||
6f0c2cea CB |
113 | if (dfd_init_pid < 0 || pidfd < 0) |
114 | return ret_errno(EBADF); | |
d8764025 | 115 | |
f51c7eb4 CB |
116 | ret = strnprintf(path + STRLITERALLEN("fdinfo/"), INTTYPE_TO_STRLEN(int), "%d", pidfd); |
117 | if (ret < 0) | |
d8764025 CB |
118 | return ret_errno(EIO); |
119 | ||
6f0c2cea | 120 | f = fdopen_at(dfd_init_pid, path, "re", PROTECT_OPEN, PROTECT_LOOKUP_BENEATH); |
d8764025 CB |
121 | if (!f) |
122 | return -errno; | |
123 | ||
124 | while (getline(&line, &len, f) != -1) { | |
125 | const char *prefix = "Pid:\t"; | |
126 | const size_t prefix_len = STRLITERALLEN("Pid:\t"); | |
127 | int pid = -ESRCH; | |
128 | char *slider = line; | |
129 | ||
6a6c7030 | 130 | if (!strnequal(slider, prefix, prefix_len)) |
d8764025 CB |
131 | continue; |
132 | ||
133 | slider += prefix_len; | |
134 | slider = lxc_trim_whitespace_in_place(slider); | |
135 | ||
136 | ret = lxc_safe_int(slider, &pid); | |
137 | if (ret) | |
138 | return -ret; | |
139 | ||
140 | return pid; | |
141 | } | |
142 | ||
143 | return ret_errno(ENOENT); | |
144 | } | |
145 | ||
6e36c297 CB |
146 | static inline bool sync_wake_pid(int fd, pid_t pid) |
147 | { | |
148 | return lxc_write_nointr(fd, &pid, sizeof(pid_t)) == sizeof(pid_t); | |
149 | } | |
150 | ||
151 | static inline bool sync_wait_pid(int fd, pid_t *pid) | |
152 | { | |
153 | return lxc_read_nointr(fd, pid, sizeof(pid_t)) == sizeof(pid_t); | |
154 | } | |
155 | ||
156 | static inline bool sync_wake_fd(int fd, int fd_send) | |
157 | { | |
158 | return lxc_abstract_unix_send_fds(fd, &fd_send, 1, NULL, 0) > 0; | |
159 | } | |
160 | ||
161 | static inline bool sync_wait_fd(int fd, int *fd_recv) | |
162 | { | |
d17c815d | 163 | return lxc_abstract_unix_recv_one_fd(fd, fd_recv, NULL, 0) > 0; |
6e36c297 CB |
164 | } |
165 | ||
afc691a0 CB |
166 | static bool attach_lsm(lxc_attach_options_t *options) |
167 | { | |
b445fcb1 | 168 | return (options->attach_flags & (LXC_ATTACH_LSM | LXC_ATTACH_LSM_LABEL)); |
afc691a0 CB |
169 | } |
170 | ||
9745eb8a CB |
171 | static struct attach_context *alloc_attach_context(void) |
172 | { | |
581b849a CB |
173 | struct attach_context *ctx; |
174 | ||
175 | ctx = zalloc(sizeof(struct attach_context)); | |
176 | if (!ctx) | |
177 | return ret_set_errno(NULL, ENOMEM); | |
178 | ||
f620ed44 CB |
179 | ctx->init_pid = -ESRCH; |
180 | ||
9b31ab58 CB |
181 | ctx->dfd_self_pid = -EBADF; |
182 | ctx->dfd_init_pid = -EBADF; | |
183 | ctx->init_pidfd = -EBADF; | |
f620ed44 | 184 | |
9b31ab58 CB |
185 | ctx->setup_ns_uid = LXC_INVALID_UID; |
186 | ctx->setup_ns_gid = LXC_INVALID_GID; | |
187 | ctx->target_ns_uid = LXC_INVALID_UID; | |
188 | ctx->target_ns_gid = LXC_INVALID_GID; | |
189 | ctx->target_host_uid = LXC_INVALID_UID; | |
190 | ctx->target_host_gid = LXC_INVALID_GID; | |
581b849a | 191 | |
2533995e | 192 | for (lxc_namespace_t i = 0; i < LXC_NS_MAX; i++) |
581b849a CB |
193 | ctx->ns_fd[i] = -EBADF; |
194 | ||
195 | return ctx; | |
9745eb8a CB |
196 | } |
197 | ||
ee142207 | 198 | static int get_personality(const char *name, const char *lxcpath, |
64a04c84 | 199 | personality_t *personality) |
d92c8e40 CB |
200 | { |
201 | __do_free char *p = NULL; | |
7c43fa56 | 202 | int ret; |
ee142207 | 203 | signed long per; |
d92c8e40 CB |
204 | |
205 | p = lxc_cmd_get_config_item(name, "lxc.arch", lxcpath); | |
ee142207 CB |
206 | if (!p) { |
207 | *personality = LXC_ARCH_UNCHANGED; | |
208 | return 0; | |
209 | } | |
d92c8e40 | 210 | |
7c43fa56 CB |
211 | ret = lxc_config_parse_arch(p, &per); |
212 | if (ret < 0) | |
213 | return syserror("Failed to parse personality"); | |
ee142207 CB |
214 | |
215 | *personality = per; | |
216 | return 0; | |
d92c8e40 CB |
217 | } |
218 | ||
4475fabb | 219 | static int userns_setup_ids(struct attach_context *ctx, |
3ac4480a | 220 | lxc_attach_options_t *options) |
4475fabb CB |
221 | { |
222 | __do_free char *line = NULL; | |
223 | __do_fclose FILE *f_gidmap = NULL, *f_uidmap = NULL; | |
224 | size_t len = 0; | |
225 | uid_t init_ns_uid = LXC_INVALID_UID; | |
226 | gid_t init_ns_gid = LXC_INVALID_GID; | |
227 | uid_t nsuid, hostuid, range_uid; | |
228 | gid_t nsgid, hostgid, range_gid; | |
229 | ||
230 | if (!(options->namespaces & CLONE_NEWUSER)) | |
231 | return 0; | |
232 | ||
72a19d2f | 233 | f_uidmap = fdopen_at(ctx->dfd_init_pid, "uid_map", "re", PROTECT_OPEN, PROTECT_LOOKUP_BENEATH); |
4475fabb CB |
234 | if (!f_uidmap) |
235 | return log_error_errno(-errno, errno, "Failed to open uid_map"); | |
236 | ||
237 | while (getline(&line, &len, f_uidmap) != -1) { | |
238 | if (sscanf(line, "%u %u %u", &nsuid, &hostuid, &range_uid) != 3) | |
239 | continue; | |
240 | ||
241 | if (0 >= nsuid && 0 < nsuid + range_uid) { | |
3ac4480a | 242 | ctx->setup_ns_uid = 0; |
4475fabb CB |
243 | TRACE("Container has mapping for uid 0"); |
244 | break; | |
245 | } | |
246 | ||
3ac4480a CB |
247 | if (ctx->target_host_uid >= hostuid && ctx->target_host_uid < hostuid + range_uid) { |
248 | init_ns_uid = (ctx->target_host_uid - hostuid) + nsuid; | |
4475fabb CB |
249 | TRACE("Container runs with uid %d", init_ns_uid); |
250 | } | |
251 | } | |
252 | ||
72a19d2f | 253 | f_gidmap = fdopen_at(ctx->dfd_init_pid, "gid_map", "re", PROTECT_OPEN, PROTECT_LOOKUP_BENEATH); |
4475fabb CB |
254 | if (!f_gidmap) |
255 | return log_error_errno(-errno, errno, "Failed to open gid_map"); | |
256 | ||
257 | while (getline(&line, &len, f_gidmap) != -1) { | |
258 | if (sscanf(line, "%u %u %u", &nsgid, &hostgid, &range_gid) != 3) | |
259 | continue; | |
260 | ||
261 | if (0 >= nsgid && 0 < nsgid + range_gid) { | |
3ac4480a | 262 | ctx->setup_ns_gid = 0; |
4475fabb CB |
263 | TRACE("Container has mapping for gid 0"); |
264 | break; | |
265 | } | |
266 | ||
3ac4480a CB |
267 | if (ctx->target_host_gid >= hostgid && ctx->target_host_gid < hostgid + range_gid) { |
268 | init_ns_gid = (ctx->target_host_gid - hostgid) + nsgid; | |
4475fabb CB |
269 | TRACE("Container runs with gid %d", init_ns_gid); |
270 | } | |
271 | } | |
272 | ||
3ac4480a CB |
273 | if (ctx->setup_ns_uid == LXC_INVALID_UID) |
274 | ctx->setup_ns_uid = init_ns_uid; | |
4475fabb | 275 | |
3ac4480a CB |
276 | if (ctx->setup_ns_gid == LXC_INVALID_UID) |
277 | ctx->setup_ns_gid = init_ns_gid; | |
4475fabb | 278 | |
4475fabb CB |
279 | return 0; |
280 | } | |
281 | ||
282 | static void userns_target_ids(struct attach_context *ctx, lxc_attach_options_t *options) | |
283 | { | |
284 | if (options->uid != LXC_INVALID_UID) | |
3ac4480a | 285 | ctx->target_ns_uid = options->uid; |
4475fabb | 286 | else if (options->namespaces & CLONE_NEWUSER) |
3ac4480a | 287 | ctx->target_ns_uid = ctx->setup_ns_uid; |
4475fabb | 288 | else |
3ac4480a | 289 | ctx->target_ns_uid = 0; |
4475fabb | 290 | |
3ac4480a | 291 | if (ctx->target_ns_uid == LXC_INVALID_UID) |
4475fabb CB |
292 | WARN("Invalid uid specified"); |
293 | ||
294 | if (options->gid != LXC_INVALID_GID) | |
3ac4480a | 295 | ctx->target_ns_gid = options->gid; |
4475fabb | 296 | else if (options->namespaces & CLONE_NEWUSER) |
3ac4480a | 297 | ctx->target_ns_gid = ctx->setup_ns_gid; |
4475fabb | 298 | else |
3ac4480a | 299 | ctx->target_ns_gid = 0; |
4475fabb | 300 | |
3ac4480a | 301 | if (ctx->target_ns_gid == LXC_INVALID_GID) |
4475fabb CB |
302 | WARN("Invalid gid specified"); |
303 | } | |
304 | ||
9680e7b0 CB |
305 | static int parse_init_status(struct attach_context *ctx, lxc_attach_options_t *options) |
306 | { | |
307 | __do_free char *line = NULL; | |
308 | __do_fclose FILE *f = NULL; | |
309 | size_t len = 0; | |
310 | bool caps_found = false; | |
4475fabb | 311 | int ret; |
9680e7b0 | 312 | |
72a19d2f | 313 | f = fdopen_at(ctx->dfd_init_pid, "status", "re", PROTECT_OPEN, PROTECT_LOOKUP_BENEATH); |
9680e7b0 | 314 | if (!f) |
4475fabb | 315 | return log_error_errno(-errno, errno, "Failed to open status file"); |
9680e7b0 CB |
316 | |
317 | while (getline(&line, &len, f) != -1) { | |
318 | signed long value = -1; | |
9680e7b0 | 319 | |
4475fabb CB |
320 | /* |
321 | * Format is: real, effective, saved set user, fs we only care | |
322 | * about real uid. | |
323 | */ | |
324 | ret = sscanf(line, "Uid: %ld", &value); | |
325 | if (ret != EOF && ret == 1) { | |
3ac4480a CB |
326 | ctx->target_host_uid = (uid_t)value; |
327 | TRACE("Container's init process runs with hostuid %d", ctx->target_host_uid); | |
4475fabb CB |
328 | goto next; |
329 | } | |
9680e7b0 | 330 | |
4475fabb CB |
331 | ret = sscanf(line, "Gid: %ld", &value); |
332 | if (ret != EOF && ret == 1) { | |
3ac4480a CB |
333 | ctx->target_host_gid = (gid_t)value; |
334 | TRACE("Container's init process runs with hostgid %d", ctx->target_host_gid); | |
4475fabb | 335 | goto next; |
9680e7b0 CB |
336 | } |
337 | ||
338 | ret = sscanf(line, "CapBnd: %llx", &ctx->capability_mask); | |
339 | if (ret != EOF && ret == 1) { | |
340 | caps_found = true; | |
341 | goto next; | |
342 | } | |
343 | ||
344 | next: | |
3ac4480a CB |
345 | if (ctx->target_host_uid != LXC_INVALID_UID && |
346 | ctx->target_host_gid != LXC_INVALID_GID && | |
4475fabb | 347 | caps_found) |
9680e7b0 CB |
348 | break; |
349 | ||
350 | } | |
351 | ||
3ac4480a | 352 | ret = userns_setup_ids(ctx, options); |
4475fabb CB |
353 | if (ret) |
354 | return log_error_errno(ret, errno, "Failed to get setup ids"); | |
355 | userns_target_ids(ctx, options); | |
356 | ||
9680e7b0 CB |
357 | return 0; |
358 | } | |
359 | ||
9b31ab58 CB |
360 | static bool pidfd_setns_supported(struct attach_context *ctx) |
361 | { | |
362 | int ret; | |
363 | ||
364 | /* | |
365 | * The ability to attach to time namespaces came after the introduction | |
366 | * of of using pidfds for attaching to namespaces. To avoid having to | |
367 | * special-case both CLONE_NEWUSER and CLONE_NEWTIME handling, let's | |
368 | * use CLONE_NEWTIME as gatekeeper. | |
369 | */ | |
370 | if (ctx->init_pidfd >= 0) | |
371 | ret = setns(ctx->init_pidfd, CLONE_NEWTIME); | |
372 | else | |
373 | ret = -EOPNOTSUPP; | |
374 | TRACE("Attaching to namespaces via pidfds %s", | |
375 | ret ? "unsupported" : "supported"); | |
376 | return ret == 0; | |
377 | } | |
378 | ||
500ed813 | 379 | static int get_attach_context(struct attach_context *ctx, |
afc691a0 CB |
380 | struct lxc_container *container, |
381 | lxc_attach_options_t *options) | |
e0732705 | 382 | { |
9680e7b0 | 383 | __do_free char *lsm_label = NULL; |
6f4f1937 | 384 | int ret; |
c538837d | 385 | char path[LXC_PROC_PID_LEN]; |
e0732705 | 386 | |
500ed813 | 387 | ctx->container = container; |
afc691a0 | 388 | ctx->attach_flags = options->attach_flags; |
500ed813 | 389 | |
6f0c2cea CB |
390 | ctx->dfd_self_pid = open_at(-EBADF, "/proc/self", |
391 | PROTECT_OPATH_FILE & ~O_NOFOLLOW, | |
392 | (PROTECT_LOOKUP_ABSOLUTE_WITH_SYMLINKS & ~RESOLVE_NO_XDEV), 0); | |
393 | if (ctx->dfd_self_pid < 0) | |
394 | return log_error_errno(-errno, errno, "Failed to open /proc/self"); | |
395 | ||
9b31ab58 CB |
396 | ctx->init_pidfd = lxc_cmd_get_init_pidfd(container->name, container->config_path); |
397 | if (ctx->init_pidfd >= 0) | |
398 | ctx->init_pid = pidfd_get_pid(ctx->dfd_self_pid, ctx->init_pidfd); | |
d8764025 CB |
399 | else |
400 | ctx->init_pid = lxc_cmd_get_init_pid(container->name, container->config_path); | |
500ed813 CB |
401 | if (ctx->init_pid < 0) |
402 | return log_error(-1, "Failed to get init pid"); | |
403 | ||
f51c7eb4 CB |
404 | ret = strnprintf(path, sizeof(path), "/proc/%d", ctx->init_pid); |
405 | if (ret < 0) | |
c538837d | 406 | return ret_errno(EIO); |
e0732705 | 407 | |
5129b2d3 CB |
408 | ctx->dfd_init_pid = open_at(-EBADF, path, |
409 | PROTECT_OPATH_DIRECTORY, | |
410 | (PROTECT_LOOKUP_ABSOLUTE & ~RESOLVE_NO_XDEV), 0); | |
9680e7b0 | 411 | if (ctx->dfd_init_pid < 0) |
4475fabb | 412 | return log_error_errno(-errno, errno, "Failed to open /proc/%d", ctx->init_pid); |
c538837d | 413 | |
9b31ab58 CB |
414 | if (ctx->init_pidfd >= 0) { |
415 | ret = lxc_raw_pidfd_send_signal(ctx->init_pidfd, 0, NULL, 0); | |
d8764025 CB |
416 | if (ret) |
417 | return log_error_errno(-errno, errno, "Container process exited or PID has been recycled"); | |
418 | else | |
419 | TRACE("Container process still running and PID was not recycled"); | |
9b31ab58 CB |
420 | |
421 | if (!pidfd_setns_supported(ctx)) { | |
422 | /* We can't risk leaking file descriptors during attach. */ | |
423 | if (close(ctx->init_pidfd)) | |
424 | return log_error_errno(-errno, errno, "Failed to close pidfd"); | |
425 | ||
426 | ctx->init_pidfd = -EBADF; | |
427 | TRACE("Attaching to namespaces via pidfds not supported"); | |
428 | } | |
d8764025 CB |
429 | } |
430 | ||
4475fabb CB |
431 | /* Determine which namespaces the container was created with. */ |
432 | if (options->namespaces == -1) { | |
433 | options->namespaces = lxc_cmd_get_clone_flags(container->name, container->config_path); | |
434 | if (options->namespaces == -1) | |
435 | return log_error_errno(-EINVAL, EINVAL, "Failed to automatically determine the namespaces which the container uses"); | |
436 | ||
2533995e | 437 | for (lxc_namespace_t i = 0; i < LXC_NS_MAX; i++) { |
4475fabb CB |
438 | if (ns_info[i].clone_flag & CLONE_NEWCGROUP) |
439 | if (!(options->attach_flags & LXC_ATTACH_MOVE_TO_CGROUP) || | |
440 | !cgns_supported()) | |
441 | continue; | |
442 | ||
443 | if (ns_info[i].clone_flag & options->namespaces) | |
444 | continue; | |
445 | ||
446 | ctx->ns_inherited |= ns_info[i].clone_flag; | |
447 | } | |
448 | } | |
449 | ||
9680e7b0 CB |
450 | ret = parse_init_status(ctx, options); |
451 | if (ret) | |
4475fabb | 452 | return log_error_errno(-errno, errno, "Failed to open parse file"); |
e0732705 | 453 | |
4eb19ac0 | 454 | ctx->lsm_ops = lsm_init_static(); |
d701d729 | 455 | |
afc691a0 CB |
456 | if (attach_lsm(options)) { |
457 | if (ctx->attach_flags & LXC_ATTACH_LSM_LABEL) | |
458 | lsm_label = options->lsm_label; | |
459 | else | |
9680e7b0 | 460 | lsm_label = ctx->lsm_ops->process_label_get_at(ctx->lsm_ops, ctx->dfd_init_pid); |
afc691a0 CB |
461 | if (!lsm_label) |
462 | WARN("No security context received"); | |
463 | else | |
464 | INFO("Retrieved security context %s", lsm_label); | |
465 | } | |
e0732705 | 466 | |
ee142207 CB |
467 | ret = get_personality(container->name, container->config_path, &ctx->personality); |
468 | if (ret) | |
469 | return log_error_errno(ret, errno, "Failed to get personality of the container"); | |
d92c8e40 | 470 | |
1874ef74 CB |
471 | if (!ctx->container->lxc_conf) { |
472 | ctx->container->lxc_conf = lxc_conf_init(); | |
473 | if (!ctx->container->lxc_conf) | |
474 | return log_error_errno(-ENOMEM, ENOMEM, "Failed to allocate new lxc config"); | |
475 | } | |
476 | ||
afc691a0 | 477 | ctx->lsm_label = move_ptr(lsm_label); |
9745eb8a | 478 | return 0; |
e0732705 CS |
479 | } |
480 | ||
9b31ab58 | 481 | static int same_nsfd(int dfd_pid1, int dfd_pid2, const char *ns_path) |
299d1198 | 482 | { |
9b31ab58 | 483 | int ret; |
299d1198 CB |
484 | struct stat ns_st1, ns_st2; |
485 | ||
9b31ab58 CB |
486 | ret = fstatat(dfd_pid1, ns_path, &ns_st1, 0); |
487 | if (ret) | |
3a6678c7 | 488 | return -errno; |
299d1198 | 489 | |
9b31ab58 CB |
490 | ret = fstatat(dfd_pid2, ns_path, &ns_st2, 0); |
491 | if (ret) | |
3a6678c7 | 492 | return -errno; |
299d1198 CB |
493 | |
494 | /* processes are in the same namespace */ | |
9b31ab58 CB |
495 | if ((ns_st1.st_dev == ns_st2.st_dev) && |
496 | (ns_st1.st_ino == ns_st2.st_ino)) | |
3a6678c7 | 497 | return 1; |
299d1198 | 498 | |
9b31ab58 CB |
499 | return 0; |
500 | } | |
501 | ||
502 | static int same_ns(int dfd_pid1, int dfd_pid2, const char *ns_path) | |
503 | { | |
504 | __do_close int ns_fd2 = -EBADF; | |
505 | int ret = -1; | |
506 | ||
507 | ns_fd2 = open_at(dfd_pid2, ns_path, PROTECT_OPEN_WITH_TRAILING_SYMLINKS, | |
508 | (PROTECT_LOOKUP_BENEATH_WITH_MAGICLINKS & | |
509 | ~(RESOLVE_NO_XDEV | RESOLVE_BENEATH)), 0); | |
510 | if (ns_fd2 < 0) { | |
9b31ab58 | 511 | if (errno == ENOENT) |
fb54db2c | 512 | return -ENOENT; |
2d7b0895 | 513 | return syserror("Failed to open %d(%s)", dfd_pid2, ns_path); |
9b31ab58 CB |
514 | } |
515 | ||
516 | ret = same_nsfd(dfd_pid1, dfd_pid2, ns_path); | |
3a6678c7 CB |
517 | switch (ret) { |
518 | case -ENOENT: | |
519 | __fallthrough; | |
520 | case 1: | |
521 | return ret_errno(ENOENT); | |
522 | case 0: | |
523 | /* processes are in different namespaces */ | |
524 | return move_fd(ns_fd2); | |
525 | } | |
9b31ab58 | 526 | |
3a6678c7 | 527 | return ret; |
299d1198 CB |
528 | } |
529 | ||
9b31ab58 CB |
530 | static int __prepare_namespaces_pidfd(struct attach_context *ctx) |
531 | { | |
2533995e | 532 | for (lxc_namespace_t i = 0; i < LXC_NS_MAX; i++) { |
9b31ab58 CB |
533 | int ret; |
534 | ||
9b31ab58 CB |
535 | ret = same_nsfd(ctx->dfd_self_pid, |
536 | ctx->dfd_init_pid, | |
537 | ns_info[i].proc_path); | |
3a6678c7 CB |
538 | switch (ret) { |
539 | case -ENOENT: | |
540 | __fallthrough; | |
541 | case 1: | |
9b31ab58 | 542 | ctx->ns_inherited &= ~ns_info[i].clone_flag; |
0b8e876f CB |
543 | TRACE("Shared %s namespace doesn't need attach", ns_info[i].proc_name); |
544 | continue; | |
3a6678c7 | 545 | case 0: |
0b8e876f CB |
546 | TRACE("Different %s namespace needs attach", ns_info[i].proc_name); |
547 | continue; | |
3a6678c7 CB |
548 | } |
549 | ||
2d7b0895 | 550 | return syserror("Failed to determine whether %s namespace is shared", |
3a6678c7 | 551 | ns_info[i].proc_name); |
9b31ab58 CB |
552 | } |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
557 | static int __prepare_namespaces_nsfd(struct attach_context *ctx, | |
558 | lxc_attach_options_t *options) | |
b7873c95 | 559 | { |
2533995e CB |
560 | for (lxc_namespace_t i = 0; i < LXC_NS_MAX; i++) { |
561 | lxc_namespace_t j; | |
b7873c95 CB |
562 | |
563 | if (options->namespaces & ns_info[i].clone_flag) | |
5129b2d3 CB |
564 | ctx->ns_fd[i] = open_at(ctx->dfd_init_pid, |
565 | ns_info[i].proc_path, | |
566 | PROTECT_OPEN_WITH_TRAILING_SYMLINKS, | |
9b31ab58 CB |
567 | (PROTECT_LOOKUP_BENEATH_WITH_MAGICLINKS & |
568 | ~(RESOLVE_NO_XDEV | RESOLVE_BENEATH)), | |
5129b2d3 | 569 | 0); |
b7873c95 | 570 | else if (ctx->ns_inherited & ns_info[i].clone_flag) |
5129b2d3 CB |
571 | ctx->ns_fd[i] = same_ns(ctx->dfd_self_pid, |
572 | ctx->dfd_init_pid, | |
573 | ns_info[i].proc_path); | |
b7873c95 CB |
574 | else |
575 | continue; | |
576 | ||
577 | if (ctx->ns_fd[i] >= 0) | |
578 | continue; | |
579 | ||
fb54db2c | 580 | if (ctx->ns_fd[i] == -ENOENT) { |
b7873c95 CB |
581 | ctx->ns_inherited &= ~ns_info[i].clone_flag; |
582 | continue; | |
583 | } | |
584 | ||
585 | /* We failed to preserve the namespace. */ | |
9b31ab58 CB |
586 | SYSERROR("Failed to preserve %s namespace of %d", |
587 | ns_info[i].proc_name, ctx->init_pid); | |
b7873c95 CB |
588 | |
589 | /* Close all already opened file descriptors before we return an | |
590 | * error, so we don't leak them. | |
591 | */ | |
592 | for (j = 0; j < i; j++) | |
593 | close_prot_errno_disarm(ctx->ns_fd[j]); | |
594 | ||
595 | return -1; | |
596 | } | |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
9b31ab58 CB |
601 | static int prepare_namespaces(struct attach_context *ctx, |
602 | lxc_attach_options_t *options) | |
b7873c95 | 603 | { |
9b31ab58 CB |
604 | if (ctx->init_pidfd < 0) |
605 | return __prepare_namespaces_nsfd(ctx, options); | |
606 | ||
607 | return __prepare_namespaces_pidfd(ctx); | |
b7873c95 CB |
608 | } |
609 | ||
9b31ab58 | 610 | static inline void put_namespaces(struct attach_context *ctx) |
b7873c95 | 611 | { |
9b31ab58 CB |
612 | if (ctx->init_pidfd < 0) { |
613 | for (int i = 0; i < LXC_NS_MAX; i++) | |
614 | close_prot_errno_disarm(ctx->ns_fd[i]); | |
615 | } | |
616 | } | |
b7873c95 | 617 | |
9b31ab58 CB |
618 | static int __attach_namespaces_pidfd(struct attach_context *ctx, |
619 | lxc_attach_options_t *options) | |
620 | { | |
621 | unsigned int ns_flags = options->namespaces | ctx->ns_inherited; | |
622 | int ret; | |
b7873c95 | 623 | |
9b31ab58 CB |
624 | /* The common case is to attach to all namespaces. */ |
625 | ret = setns(ctx->init_pidfd, ns_flags); | |
626 | if (ret) | |
627 | return log_error_errno(-errno, errno, | |
628 | "Failed to attach to namespaces via pidfd"); | |
629 | ||
630 | /* We can't risk leaking file descriptors into the container. */ | |
631 | if (close(ctx->init_pidfd)) | |
632 | return log_error_errno(-errno, errno, "Failed to close pidfd"); | |
633 | ctx->init_pidfd = -EBADF; | |
634 | ||
635 | return log_trace(0, "Attached to container namespaces via pidfd"); | |
b7873c95 CB |
636 | } |
637 | ||
9b31ab58 CB |
638 | static int __attach_namespaces_nsfd(struct attach_context *ctx, |
639 | lxc_attach_options_t *options) | |
99d50954 | 640 | { |
92466fe3 CB |
641 | int fret = 0; |
642 | ||
2533995e | 643 | for (lxc_namespace_t i = 0; i < LXC_NS_MAX; i++) { |
ffeeed8b | 644 | int ret; |
99d50954 | 645 | |
877f3a04 | 646 | if (ctx->ns_fd[i] < 0) |
26818618 CB |
647 | continue; |
648 | ||
21d0acc2 | 649 | ret = setns(ctx->ns_fd[i], ns_info[i].clone_flag); |
92466fe3 | 650 | if (ret) |
9b31ab58 CB |
651 | return log_error_errno(-errno, errno, |
652 | "Failed to attach to %s namespace of %d", | |
653 | ns_info[i].proc_name, | |
654 | ctx->init_pid); | |
92466fe3 CB |
655 | |
656 | if (close(ctx->ns_fd[i])) { | |
657 | fret = -errno; | |
9b31ab58 CB |
658 | SYSERROR("Failed to close file descriptor for %s namespace", |
659 | ns_info[i].proc_name); | |
92466fe3 CB |
660 | } |
661 | ctx->ns_fd[i] = -EBADF; | |
99d50954 CS |
662 | } |
663 | ||
92466fe3 | 664 | return fret; |
99d50954 CS |
665 | } |
666 | ||
9b31ab58 CB |
667 | static int attach_namespaces(struct attach_context *ctx, |
668 | lxc_attach_options_t *options) | |
669 | { | |
670 | if (lxc_log_trace()) { | |
2533995e | 671 | for (lxc_namespace_t i = 0; i < LXC_NS_MAX; i++) { |
9b31ab58 CB |
672 | if (ns_info[i].clone_flag & options->namespaces) { |
673 | TRACE("Attaching to %s namespace", ns_info[i].proc_name); | |
674 | continue; | |
675 | } | |
676 | if (ns_info[i].clone_flag & ctx->ns_inherited) { | |
677 | TRACE("Sharing %s namespace", ns_info[i].proc_name); | |
678 | continue; | |
679 | } | |
680 | TRACE("Inheriting %s namespace", ns_info[i].proc_name); | |
681 | } | |
682 | } | |
683 | ||
684 | if (ctx->init_pidfd < 0) | |
685 | return __attach_namespaces_nsfd(ctx, options); | |
686 | ||
687 | return __attach_namespaces_pidfd(ctx, options); | |
688 | } | |
689 | ||
690 | static void put_attach_context(struct attach_context *ctx) | |
691 | { | |
692 | if (ctx) { | |
693 | if (!(ctx->attach_flags & LXC_ATTACH_LSM_LABEL)) | |
694 | free_disarm(ctx->lsm_label); | |
695 | close_prot_errno_disarm(ctx->dfd_init_pid); | |
696 | ||
697 | if (ctx->container) { | |
698 | lxc_container_put(ctx->container); | |
699 | ctx->container = NULL; | |
700 | } | |
701 | ||
702 | put_namespaces(ctx); | |
703 | free(ctx); | |
704 | } | |
705 | } | |
706 | ||
c538837d CB |
707 | /* |
708 | * Place anything in here that needs to be get rid of before we move into the | |
709 | * container's context and fail hard if we can't. | |
710 | */ | |
711 | static bool attach_context_security_barrier(struct attach_context *ctx) | |
712 | { | |
713 | if (ctx) { | |
25c659d5 CB |
714 | if (close(ctx->dfd_self_pid)) |
715 | return false; | |
716 | ctx->dfd_self_pid = -EBADF; | |
717 | ||
718 | if (close(ctx->dfd_init_pid)) | |
c538837d | 719 | return false; |
25c659d5 | 720 | ctx->dfd_init_pid = -EBADF; |
c538837d CB |
721 | } |
722 | ||
723 | return true; | |
724 | } | |
725 | ||
e4103cf6 | 726 | int lxc_attach_remount_sys_proc(void) |
7a0b0b56 CS |
727 | { |
728 | int ret; | |
729 | ||
730 | ret = unshare(CLONE_NEWNS); | |
ffeeed8b CB |
731 | if (ret < 0) |
732 | return log_error_errno(-1, errno, "Failed to unshare mount namespace"); | |
7a0b0b56 | 733 | |
9e61fb1f CB |
734 | if (detect_shared_rootfs() && mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL)) |
735 | SYSERROR("Failed to recursively turn root mount tree into dependent mount. Continuing..."); | |
2c6f3fc9 | 736 | |
8ce83369 | 737 | /* Assume /proc is always mounted, so remount it. */ |
7a0b0b56 | 738 | ret = umount2("/proc", MNT_DETACH); |
ffeeed8b CB |
739 | if (ret < 0) |
740 | return log_error_errno(-1, errno, "Failed to unmount /proc"); | |
7a0b0b56 | 741 | |
0d50f288 | 742 | ret = mount("none", "/proc", "proc", 0, NULL); |
ffeeed8b CB |
743 | if (ret < 0) |
744 | return log_error_errno(-1, errno, "Failed to remount /proc"); | |
7a0b0b56 | 745 | |
ffeeed8b CB |
746 | /* |
747 | * Try to umount /sys. If it's not a mount point, we'll get EINVAL, then | |
8ce83369 | 748 | * we ignore it because it may not have been mounted in the first place. |
7a0b0b56 CS |
749 | */ |
750 | ret = umount2("/sys", MNT_DETACH); | |
ffeeed8b CB |
751 | if (ret < 0 && errno != EINVAL) |
752 | return log_error_errno(-1, errno, "Failed to unmount /sys"); | |
753 | ||
754 | /* Remount it. */ | |
0d50f288 | 755 | if (ret == 0 && mount("none", "/sys", "sysfs", 0, NULL)) |
ffeeed8b | 756 | return log_error_errno(-1, errno, "Failed to remount /sys"); |
7a0b0b56 CS |
757 | |
758 | return 0; | |
759 | } | |
760 | ||
677e1d27 | 761 | static int drop_capabilities(struct attach_context *ctx) |
e0732705 | 762 | { |
ffeeed8b | 763 | int last_cap; |
e0732705 | 764 | |
6f4f1937 | 765 | last_cap = lxc_caps_last_cap(); |
ffeeed8b | 766 | for (int cap = 0; cap <= last_cap; cap++) { |
e0732705 CS |
767 | if (ctx->capability_mask & (1LL << cap)) |
768 | continue; | |
769 | ||
b81689a1 | 770 | if (prctl(PR_CAPBSET_DROP, prctl_arg(cap), prctl_arg(0), |
ffeeed8b CB |
771 | prctl_arg(0), prctl_arg(0))) |
772 | return log_error_errno(-1, errno, "Failed to drop capability %d", cap); | |
ea918412 | 773 | |
94ac256f | 774 | TRACE("Dropped capability %d", cap); |
e0732705 CS |
775 | } |
776 | ||
777 | return 0; | |
778 | } | |
905022f7 | 779 | |
ab919e5f | 780 | static int lxc_attach_set_environment(struct attach_context *ctx, |
7385273f | 781 | enum lxc_attach_env_policy_t policy, |
6f4f1937 | 782 | char **extra_env, char **extra_keep) |
b3a39ba6 | 783 | { |
3d55242a | 784 | int ret; |
7385273f | 785 | struct lxc_list *iterator; |
786 | ||
799f96fd | 787 | if (policy == LXC_ATTACH_CLEAR_ENV) { |
3d5e9f48 | 788 | int path_kept = 0; |
6f4f1937 | 789 | char **extra_keep_store = NULL; |
3d5e9f48 CS |
790 | |
791 | if (extra_keep) { | |
792 | size_t count, i; | |
793 | ||
3d55242a CB |
794 | for (count = 0; extra_keep[count]; count++) |
795 | ; | |
3d5e9f48 | 796 | |
89b7bfe3 | 797 | extra_keep_store = zalloc(count * sizeof(char *)); |
3d55242a | 798 | if (!extra_keep_store) |
3d5e9f48 | 799 | return -1; |
3d55242a | 800 | |
3d5e9f48 CS |
801 | for (i = 0; i < count; i++) { |
802 | char *v = getenv(extra_keep[i]); | |
803 | if (v) { | |
804 | extra_keep_store[i] = strdup(v); | |
805 | if (!extra_keep_store[i]) { | |
3d5e9f48 CS |
806 | while (i > 0) |
807 | free(extra_keep_store[--i]); | |
ea918412 | 808 | |
3d5e9f48 CS |
809 | free(extra_keep_store); |
810 | return -1; | |
811 | } | |
3d55242a | 812 | |
e8c43357 | 813 | if (strequal(extra_keep[i], "PATH")) |
3d5e9f48 CS |
814 | path_kept = 1; |
815 | } | |
3d5e9f48 CS |
816 | } |
817 | } | |
818 | ||
799f96fd | 819 | if (clearenv()) { |
a9cab7e3 | 820 | if (extra_keep_store) { |
3d55242a CB |
821 | char **p; |
822 | ||
a9cab7e3 CS |
823 | for (p = extra_keep_store; *p; p++) |
824 | free(*p); | |
3d55242a | 825 | |
a9cab7e3 CS |
826 | free(extra_keep_store); |
827 | } | |
3d55242a | 828 | |
ffeeed8b | 829 | return log_error(-1, "Failed to clear environment"); |
3d5e9f48 CS |
830 | } |
831 | ||
832 | if (extra_keep_store) { | |
833 | size_t i; | |
6f4f1937 | 834 | |
3d5e9f48 | 835 | for (i = 0; extra_keep[i]; i++) { |
acd4922e | 836 | if (extra_keep_store[i]) { |
3d55242a CB |
837 | ret = setenv(extra_keep[i], extra_keep_store[i], 1); |
838 | if (ret < 0) | |
a24c5678 | 839 | SYSWARN("Failed to set environment variable"); |
acd4922e | 840 | } |
ea918412 | 841 | |
3d5e9f48 CS |
842 | free(extra_keep_store[i]); |
843 | } | |
ea918412 | 844 | |
3d5e9f48 CS |
845 | free(extra_keep_store); |
846 | } | |
847 | ||
8ce83369 CB |
848 | /* Always set a default path; shells and execlp tend to be fine |
849 | * without it, but there is a disturbing number of C programs | |
850 | * out there that just assume that getenv("PATH") is never NULL | |
851 | * and then die a painful segfault death. | |
852 | */ | |
3d55242a CB |
853 | if (!path_kept) { |
854 | ret = setenv("PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", 1); | |
855 | if (ret < 0) | |
a24c5678 | 856 | SYSWARN("Failed to set environment variable"); |
3d55242a | 857 | } |
b3a39ba6 DW |
858 | } |
859 | ||
3d55242a | 860 | ret = putenv("container=lxc"); |
ffeeed8b | 861 | if (ret < 0) |
818a57fc | 862 | return log_warn(-1, "Failed to set environment variable"); |
b3a39ba6 | 863 | |
7385273f | 864 | /* Set container environment variables.*/ |
640952e5 | 865 | if (ctx->container->lxc_conf) { |
ab919e5f | 866 | lxc_list_for_each(iterator, &ctx->container->lxc_conf->environment) { |
3d55242a CB |
867 | char *env_tmp; |
868 | ||
869 | env_tmp = strdup((char *)iterator->elem); | |
870 | if (!env_tmp) | |
7385273f | 871 | return -1; |
7385273f | 872 | |
3d55242a | 873 | ret = putenv(env_tmp); |
ffeeed8b CB |
874 | if (ret < 0) |
875 | return log_error_errno(-1, errno, "Failed to set environment variable: %s", (char *)iterator->elem); | |
7385273f | 876 | } |
877 | } | |
878 | ||
8ce83369 | 879 | /* Set extra environment variables. */ |
3d5e9f48 CS |
880 | if (extra_env) { |
881 | for (; *extra_env; extra_env++) { | |
3d55242a | 882 | char *p; |
ea918412 | 883 | |
8ce83369 CB |
884 | /* We just assume the user knows what they are doing, so |
885 | * we don't do any checks. | |
886 | */ | |
3d55242a CB |
887 | p = strdup(*extra_env); |
888 | if (!p) | |
3d5e9f48 | 889 | return -1; |
3d55242a CB |
890 | |
891 | ret = putenv(p); | |
892 | if (ret < 0) | |
a24c5678 | 893 | SYSWARN("Failed to set environment variable"); |
3d5e9f48 CS |
894 | } |
895 | } | |
896 | ||
b3a39ba6 DW |
897 | return 0; |
898 | } | |
899 | ||
74a3920a | 900 | static char *lxc_attach_getpwshell(uid_t uid) |
905022f7 | 901 | { |
1b9c9f5b | 902 | __do_free char *line = NULL, *result = NULL; |
cd8f5663 | 903 | __do_fclose FILE *pipe_f = NULL; |
6f4f1937 | 904 | int fd, ret; |
905022f7 CS |
905 | pid_t pid; |
906 | int pipes[2]; | |
3fa23ac3 CB |
907 | bool found = false; |
908 | size_t line_bufsz = 0; | |
905022f7 | 909 | |
8ce83369 CB |
910 | /* We need to fork off a process that runs the getent program, and we |
911 | * need to capture its output, so we use a pipe for that purpose. | |
905022f7 | 912 | */ |
3fa23ac3 | 913 | ret = pipe2(pipes, O_CLOEXEC); |
905022f7 CS |
914 | if (ret < 0) |
915 | return NULL; | |
916 | ||
917 | pid = fork(); | |
918 | if (pid < 0) { | |
919 | close(pipes[0]); | |
920 | close(pipes[1]); | |
921 | return NULL; | |
922 | } | |
923 | ||
3fa23ac3 | 924 | if (!pid) { |
905022f7 CS |
925 | char uid_buf[32]; |
926 | char *arguments[] = { | |
927 | "getent", | |
928 | "passwd", | |
929 | uid_buf, | |
930 | NULL | |
931 | }; | |
932 | ||
933 | close(pipes[0]); | |
934 | ||
8ce83369 | 935 | /* We want to capture stdout. */ |
3fa23ac3 | 936 | ret = dup2(pipes[1], STDOUT_FILENO); |
905022f7 | 937 | close(pipes[1]); |
3fa23ac3 | 938 | if (ret < 0) |
ea918412 | 939 | _exit(EXIT_FAILURE); |
905022f7 | 940 | |
8ce83369 CB |
941 | /* Get rid of stdin/stderr, so we try to associate it with |
942 | * /dev/null. | |
905022f7 | 943 | */ |
3fa23ac3 | 944 | fd = open_devnull(); |
905022f7 | 945 | if (fd < 0) { |
3fa23ac3 CB |
946 | close(STDIN_FILENO); |
947 | close(STDERR_FILENO); | |
905022f7 | 948 | } else { |
3fa23ac3 | 949 | (void)dup3(fd, STDIN_FILENO, O_CLOEXEC); |
59f0e209 | 950 | (void)dup3(fd, STDERR_FILENO, O_CLOEXEC); |
905022f7 CS |
951 | close(fd); |
952 | } | |
953 | ||
8ce83369 | 954 | /* Finish argument list. */ |
f51c7eb4 CB |
955 | ret = strnprintf(uid_buf, sizeof(uid_buf), "%ld", (long)uid); |
956 | if (ret <= 0) | |
ea918412 | 957 | _exit(EXIT_FAILURE); |
905022f7 | 958 | |
8ce83369 | 959 | /* Try to run getent program. */ |
3fa23ac3 | 960 | (void)execvp("getent", arguments); |
ea918412 | 961 | _exit(EXIT_FAILURE); |
905022f7 | 962 | } |
3fa23ac3 CB |
963 | |
964 | close(pipes[1]); | |
965 | ||
4110345b | 966 | pipe_f = fdopen(pipes[0], "re"); |
cf4026f1 CB |
967 | if (!pipe_f) { |
968 | close(pipes[0]); | |
969 | goto reap_child; | |
970 | } | |
971 | /* Transfer ownership of pipes[0] to pipe_f. */ | |
972 | move_fd(pipes[0]); | |
973 | ||
3fa23ac3 CB |
974 | while (getline(&line, &line_bufsz, pipe_f) != -1) { |
975 | int i; | |
976 | long value; | |
977 | char *token; | |
978 | char *endptr = NULL, *saveptr = NULL; | |
979 | ||
980 | /* If we already found something, just continue to read | |
981 | * until the pipe doesn't deliver any more data, but | |
982 | * don't modify the existing data structure. | |
983 | */ | |
984 | if (found) | |
985 | continue; | |
986 | ||
18d4ffde | 987 | if (!line) |
988 | continue; | |
989 | ||
3fa23ac3 CB |
990 | /* Trim line on the right hand side. */ |
991 | for (i = strlen(line); i > 0 && (line[i - 1] == '\n' || line[i - 1] == '\r'); --i) | |
992 | line[i - 1] = '\0'; | |
993 | ||
994 | /* Split into tokens: first: user name. */ | |
995 | token = strtok_r(line, ":", &saveptr); | |
996 | if (!token) | |
997 | continue; | |
998 | ||
8de0119d | 999 | /* next: placeholder password field */ |
3fa23ac3 CB |
1000 | token = strtok_r(NULL, ":", &saveptr); |
1001 | if (!token) | |
1002 | continue; | |
1003 | ||
1004 | /* next: user id */ | |
1005 | token = strtok_r(NULL, ":", &saveptr); | |
1006 | value = token ? strtol(token, &endptr, 10) : 0; | |
1007 | if (!token || !endptr || *endptr || value == LONG_MIN || | |
ea918412 | 1008 | value == LONG_MAX) |
3fa23ac3 CB |
1009 | continue; |
1010 | ||
8de0119d | 1011 | /* placeholder conherence check: user id matches */ |
3fa23ac3 CB |
1012 | if ((uid_t)value != uid) |
1013 | continue; | |
1014 | ||
1015 | /* skip fields: gid, gecos, dir, go to next field 'shell' */ | |
1016 | for (i = 0; i < 4; i++) { | |
1017 | token = strtok_r(NULL, ":", &saveptr); | |
1018 | if (!token) | |
1019 | continue; | |
1020 | } | |
ea918412 | 1021 | |
3fa23ac3 CB |
1022 | if (!token) |
1023 | continue; | |
ea918412 | 1024 | |
1b9c9f5b | 1025 | free_disarm(result); |
3fa23ac3 CB |
1026 | result = strdup(token); |
1027 | ||
1028 | /* Sanity check that there are no fields after that. */ | |
1029 | token = strtok_r(NULL, ":", &saveptr); | |
1030 | if (token) | |
1031 | continue; | |
1032 | ||
1033 | found = true; | |
1034 | } | |
ea918412 | 1035 | |
cf4026f1 | 1036 | reap_child: |
3fa23ac3 | 1037 | ret = wait_for_pid(pid); |
1b9c9f5b | 1038 | if (ret < 0) |
3fa23ac3 | 1039 | return NULL; |
3fa23ac3 | 1040 | |
1b9c9f5b | 1041 | if (!found) |
3fa23ac3 | 1042 | return NULL; |
3fa23ac3 | 1043 | |
1b9c9f5b | 1044 | return move_ptr(result); |
905022f7 | 1045 | } |
cb3e61fa | 1046 | |
d4db3d14 | 1047 | static bool fetch_seccomp(struct lxc_container *c, lxc_attach_options_t *options) |
2c4ea790 | 1048 | { |
cd8f5663 | 1049 | __do_free char *path = NULL; |
d4db3d14 CB |
1050 | int ret; |
1051 | bool bret; | |
2eef2bda | 1052 | |
afc691a0 | 1053 | if (!attach_lsm(options)) { |
cca66e06 | 1054 | free_disarm(c->lxc_conf->seccomp.seccomp); |
2c4ea790 | 1055 | return true; |
bd4307f0 | 1056 | } |
bd7b4e28 | 1057 | |
afc691a0 | 1058 | /* Remove current setting. */ |
d4db3d14 | 1059 | if (!c->set_config_item(c, "lxc.seccomp.profile", "") && |
ea918412 | 1060 | !c->set_config_item(c, "lxc.seccomp", "")) |
2c4ea790 | 1061 | return false; |
bd7b4e28 | 1062 | |
8ce83369 | 1063 | /* Fetch the current profile path over the cmd interface. */ |
0b427da0 | 1064 | path = c->get_running_config_item(c, "lxc.seccomp.profile"); |
bd7b4e28 | 1065 | if (!path) { |
d4db3d14 | 1066 | INFO("Failed to retrieve lxc.seccomp.profile"); |
ea918412 | 1067 | |
0b427da0 | 1068 | path = c->get_running_config_item(c, "lxc.seccomp"); |
cca66e06 CB |
1069 | if (!path) |
1070 | return log_info(true, "Failed to retrieve lxc.seccomp"); | |
bd7b4e28 SG |
1071 | } |
1072 | ||
8ce83369 | 1073 | /* Copy the value into the new lxc_conf. */ |
d4db3d14 | 1074 | bret = c->set_config_item(c, "lxc.seccomp.profile", path); |
d4db3d14 CB |
1075 | if (!bret) |
1076 | return false; | |
bd7b4e28 | 1077 | |
8ce83369 | 1078 | /* Attempt to parse the resulting config. */ |
d4db3d14 | 1079 | ret = lxc_read_seccomp_config(c->lxc_conf); |
cca66e06 CB |
1080 | if (ret < 0) |
1081 | return log_error(false, "Failed to retrieve seccomp policy"); | |
2c4ea790 | 1082 | |
cca66e06 | 1083 | return log_info(true, "Retrieved seccomp policy"); |
2e812c16 CB |
1084 | } |
1085 | ||
6f4f1937 | 1086 | static bool no_new_privs(struct lxc_container *c, lxc_attach_options_t *options) |
2e812c16 | 1087 | { |
cd8f5663 | 1088 | __do_free char *val = NULL; |
2e812c16 | 1089 | |
2e812c16 | 1090 | /* Remove current setting. */ |
02d3b72b CB |
1091 | if (!c->set_config_item(c, "lxc.no_new_privs", "")) |
1092 | return log_info(false, "Failed to unset lxc.no_new_privs"); | |
2e812c16 CB |
1093 | |
1094 | /* Retrieve currently active setting. */ | |
1095 | val = c->get_running_config_item(c, "lxc.no_new_privs"); | |
02d3b72b CB |
1096 | if (!val) |
1097 | return log_info(false, "Failed to retrieve lxc.no_new_privs"); | |
2e812c16 CB |
1098 | |
1099 | /* Set currently active setting. */ | |
cd8f5663 | 1100 | return c->set_config_item(c, "lxc.no_new_privs", val); |
2c4ea790 SH |
1101 | } |
1102 | ||
338b230f | 1103 | struct attach_payload { |
a998454a | 1104 | int ipc_socket; |
cecf3e83 | 1105 | int terminal_pts_fd; |
a998454a | 1106 | lxc_attach_options_t *options; |
ab919e5f | 1107 | struct attach_context *ctx; |
a998454a CB |
1108 | lxc_attach_exec_t exec_function; |
1109 | void *exec_payload; | |
1110 | }; | |
1111 | ||
338b230f | 1112 | static void put_attach_payload(struct attach_payload *p) |
ba2be1a8 | 1113 | { |
afc691a0 CB |
1114 | if (p) { |
1115 | close_prot_errno_disarm(p->ipc_socket); | |
1116 | close_prot_errno_disarm(p->terminal_pts_fd); | |
dd53c8af | 1117 | put_attach_context(p->ctx); |
ab919e5f | 1118 | p->ctx = NULL; |
b21da190 | 1119 | } |
ba2be1a8 CB |
1120 | } |
1121 | ||
338b230f | 1122 | __noreturn static void do_attach(struct attach_payload *ap) |
a998454a | 1123 | { |
afc691a0 CB |
1124 | lxc_attach_exec_t attach_function = move_ptr(ap->exec_function); |
1125 | void *attach_function_args = move_ptr(ap->exec_payload); | |
8723f88e | 1126 | int fd_lsm, ret; |
338b230f CB |
1127 | lxc_attach_options_t* options = ap->options; |
1128 | struct attach_context *ctx = ap->ctx; | |
ab919e5f | 1129 | struct lxc_conf *conf = ctx->container->lxc_conf; |
a998454a CB |
1130 | |
1131 | /* A description of the purpose of this functionality is provided in the | |
1132 | * lxc-attach(1) manual page. We have to remount here and not in the | |
1133 | * parent process, otherwise /proc may not properly reflect the new pid | |
1134 | * namespace. | |
1135 | */ | |
1136 | if (!(options->namespaces & CLONE_NEWNS) && | |
1137 | (options->attach_flags & LXC_ATTACH_REMOUNT_PROC_SYS)) { | |
1138 | ret = lxc_attach_remount_sys_proc(); | |
b75c344c CB |
1139 | if (ret < 0) |
1140 | goto on_error; | |
ea918412 | 1141 | |
b75c344c | 1142 | TRACE("Remounted \"/proc\" and \"/sys\""); |
a998454a CB |
1143 | } |
1144 | ||
5b514ce3 | 1145 | /* Now perform additional attachments. */ |
a998454a | 1146 | if (options->attach_flags & LXC_ATTACH_SET_PERSONALITY) { |
b75c344c CB |
1147 | long new_personality; |
1148 | ||
3a881819 | 1149 | if (options->personality == LXC_ATTACH_DETECT_PERSONALITY) |
ab919e5f | 1150 | new_personality = ctx->personality; |
b75c344c CB |
1151 | else |
1152 | new_personality = options->personality; | |
ea918412 | 1153 | |
ee142207 | 1154 | if (new_personality != LXC_ARCH_UNCHANGED) { |
64a04c84 | 1155 | ret = lxc_personality(new_personality); |
ee142207 CB |
1156 | if (ret < 0) |
1157 | goto on_error; | |
ea918412 | 1158 | |
ee142207 CB |
1159 | TRACE("Set new personality"); |
1160 | } | |
a998454a | 1161 | } |
a998454a CB |
1162 | |
1163 | if (options->attach_flags & LXC_ATTACH_DROP_CAPABILITIES) { | |
677e1d27 | 1164 | ret = drop_capabilities(ctx); |
b75c344c CB |
1165 | if (ret < 0) |
1166 | goto on_error; | |
ea918412 | 1167 | |
b75c344c | 1168 | TRACE("Dropped capabilities"); |
a998454a CB |
1169 | } |
1170 | ||
1171 | /* Always set the environment (specify (LXC_ATTACH_KEEP_ENV, NULL, NULL) | |
1172 | * if you want this to be a no-op). | |
1173 | */ | |
ab919e5f | 1174 | ret = lxc_attach_set_environment(ctx, |
7385273f | 1175 | options->env_policy, |
a998454a CB |
1176 | options->extra_env_vars, |
1177 | options->extra_keep_env); | |
b75c344c CB |
1178 | if (ret < 0) |
1179 | goto on_error; | |
ea918412 | 1180 | |
b75c344c | 1181 | TRACE("Set up environment"); |
a998454a | 1182 | |
afc691a0 CB |
1183 | /* |
1184 | * This remark only affects fully unprivileged containers: | |
57de839f CB |
1185 | * Receive fd for LSM security module before we set{g,u}id(). The reason |
1186 | * is that on set{g,u}id() the kernel will a) make us undumpable and b) | |
1187 | * we will change our effective uid. This means our effective uid will | |
1188 | * be different from the effective uid of the process that created us | |
1189 | * which means that this processs no longer has capabilities in our | |
1190 | * namespace including CAP_SYS_PTRACE. This means we will not be able to | |
1191 | * read and /proc/<pid> files for the process anymore when /proc is | |
1192 | * mounted with hidepid={1,2}. So let's get the lsm label fd before the | |
1193 | * set{g,u}id(). | |
1194 | */ | |
afc691a0 | 1195 | if (attach_lsm(options) && ctx->lsm_label) { |
8723f88e | 1196 | if (!sync_wait_fd(ap->ipc_socket, &fd_lsm)) { |
6e36c297 | 1197 | SYSERROR("Failed to receive lsm label fd"); |
b75c344c | 1198 | goto on_error; |
9044b79e | 1199 | } |
1200 | ||
8723f88e | 1201 | TRACE("Received LSM label file descriptor %d from parent", fd_lsm); |
57de839f CB |
1202 | } |
1203 | ||
08ea9270 | 1204 | if (options->stdin_fd > 0 && isatty(options->stdin_fd)) { |
cd0a2b2f | 1205 | ret = lxc_make_controlling_terminal(options->stdin_fd); |
08ea9270 CB |
1206 | if (ret < 0) |
1207 | goto on_error; | |
1208 | } | |
1209 | ||
9475d2b9 CB |
1210 | if ((options->attach_flags & LXC_ATTACH_SETGROUPS) && |
1211 | options->groups.size > 0) { | |
8caac583 RJ |
1212 | if (!lxc_setgroups(options->groups.list, options->groups.size)) |
1213 | goto on_error; | |
1214 | } else { | |
1215 | if (!lxc_drop_groups() && errno != EPERM) | |
1216 | goto on_error; | |
1217 | } | |
b58214ac | 1218 | |
4475fabb | 1219 | if (options->namespaces & CLONE_NEWUSER) |
3ac4480a | 1220 | if (!lxc_switch_uid_gid(ctx->setup_ns_uid, ctx->setup_ns_gid)) |
b75c344c | 1221 | goto on_error; |
936efc72 | 1222 | |
afc691a0 | 1223 | if (attach_lsm(options) && ctx->lsm_label) { |
d3ba7c98 | 1224 | bool on_exec; |
a998454a CB |
1225 | |
1226 | /* Change into our new LSM profile. */ | |
d3ba7c98 | 1227 | on_exec = options->attach_flags & LXC_ATTACH_LSM_EXEC ? true : false; |
8723f88e CB |
1228 | ret = ctx->lsm_ops->process_label_set_at(ctx->lsm_ops, fd_lsm, ctx->lsm_label, on_exec); |
1229 | close_prot_errno_disarm(fd_lsm); | |
b75c344c CB |
1230 | if (ret < 0) |
1231 | goto on_error; | |
ea918412 | 1232 | |
ab919e5f | 1233 | TRACE("Set %s LSM label to \"%s\"", ctx->lsm_ops->name, ctx->lsm_label); |
a998454a CB |
1234 | } |
1235 | ||
640952e5 | 1236 | if (conf->no_new_privs || (options->attach_flags & LXC_ATTACH_NO_NEW_PRIVS)) { |
6ce8e678 AL |
1237 | ret = prctl(PR_SET_NO_NEW_PRIVS, prctl_arg(1), prctl_arg(0), |
1238 | prctl_arg(0), prctl_arg(0)); | |
1239 | if (ret < 0) | |
1240 | goto on_error; | |
1241 | ||
1242 | TRACE("Set PR_SET_NO_NEW_PRIVS"); | |
1243 | } | |
1244 | ||
a998454a CB |
1245 | /* The following is done after the communication socket is shut down. |
1246 | * That way, all errors that might (though unlikely) occur up until this | |
1247 | * point will have their messages printed to the original stderr (if | |
1248 | * logging is so configured) and not the fd the user supplied, if any. | |
1249 | */ | |
1250 | ||
1251 | /* Fd handling for stdin, stdout and stderr; ignore errors here, user | |
1252 | * may want to make sure the fds are closed, for example. | |
1253 | */ | |
08ea9270 | 1254 | if (options->stdin_fd >= 0 && options->stdin_fd != STDIN_FILENO) |
40301d48 | 1255 | if (dup2(options->stdin_fd, STDIN_FILENO) < 0) |
a7563434 | 1256 | SYSDEBUG("Failed to replace stdin with %d", options->stdin_fd); |
08ea9270 CB |
1257 | |
1258 | if (options->stdout_fd >= 0 && options->stdout_fd != STDOUT_FILENO) | |
40301d48 | 1259 | if (dup2(options->stdout_fd, STDOUT_FILENO) < 0) |
93b9960a | 1260 | SYSDEBUG("Failed to replace stdout with %d", options->stdout_fd); |
08ea9270 CB |
1261 | |
1262 | if (options->stderr_fd >= 0 && options->stderr_fd != STDERR_FILENO) | |
40301d48 | 1263 | if (dup2(options->stderr_fd, STDERR_FILENO) < 0) |
93b9960a | 1264 | SYSDEBUG("Failed to replace stderr with %d", options->stderr_fd); |
a998454a CB |
1265 | |
1266 | /* close the old fds */ | |
08ea9270 | 1267 | if (options->stdin_fd > STDERR_FILENO) |
a998454a | 1268 | close(options->stdin_fd); |
08ea9270 CB |
1269 | |
1270 | if (options->stdout_fd > STDERR_FILENO) | |
a998454a | 1271 | close(options->stdout_fd); |
08ea9270 CB |
1272 | |
1273 | if (options->stderr_fd > STDERR_FILENO) | |
a998454a CB |
1274 | close(options->stderr_fd); |
1275 | ||
427a8067 CB |
1276 | /* |
1277 | * Try to remove FD_CLOEXEC flag from stdin/stdout/stderr, but also | |
a998454a CB |
1278 | * here, ignore errors. |
1279 | */ | |
427a8067 | 1280 | for (int fd = STDIN_FILENO; fd <= STDERR_FILENO; fd++) { |
3f62938a | 1281 | ret = fd_cloexec(fd, false); |
b75c344c CB |
1282 | if (ret < 0) { |
1283 | SYSERROR("Failed to clear FD_CLOEXEC from file descriptor %d", fd); | |
1284 | goto on_error; | |
1285 | } | |
a998454a CB |
1286 | } |
1287 | ||
9e84479f | 1288 | if (options->attach_flags & LXC_ATTACH_TERMINAL) { |
338b230f | 1289 | ret = lxc_terminal_prepare_login(ap->terminal_pts_fd); |
ba2be1a8 | 1290 | if (ret < 0) { |
338b230f | 1291 | SYSERROR("Failed to prepare terminal file descriptor %d", ap->terminal_pts_fd); |
ba2be1a8 CB |
1292 | goto on_error; |
1293 | } | |
ea918412 | 1294 | |
338b230f | 1295 | TRACE("Prepared terminal file descriptor %d", ap->terminal_pts_fd); |
ba2be1a8 CB |
1296 | } |
1297 | ||
4475fabb | 1298 | /* Avoid unnecessary syscalls. */ |
3ac4480a CB |
1299 | if (ctx->setup_ns_uid == ctx->target_ns_uid) |
1300 | ctx->target_ns_uid = LXC_INVALID_UID; | |
1301 | ||
1302 | if (ctx->setup_ns_gid == ctx->target_ns_gid) | |
1303 | ctx->target_ns_gid = LXC_INVALID_GID; | |
4475fabb | 1304 | |
3ac4480a CB |
1305 | /* |
1306 | * Make sure that the processes STDIO is correctly owned by the user | |
1307 | * that we are switching to. | |
1308 | */ | |
1309 | ret = fix_stdio_permissions(ctx->target_ns_uid); | |
1310 | if (ret) | |
1311 | INFO("Failed to adjust stdio permissions"); | |
4475fabb | 1312 | |
e18aba7d CB |
1313 | if (conf->seccomp.seccomp) { |
1314 | ret = lxc_seccomp_load(conf); | |
1315 | if (ret < 0) | |
1316 | goto on_error; | |
1317 | ||
1318 | TRACE("Loaded seccomp profile"); | |
1319 | ||
1320 | ret = lxc_seccomp_send_notifier_fd(&conf->seccomp, ap->ipc_socket); | |
1321 | if (ret < 0) | |
1322 | goto on_error; | |
c5bac506 | 1323 | lxc_seccomp_close_notifier_fd(&conf->seccomp); |
e18aba7d CB |
1324 | } |
1325 | ||
3ac4480a | 1326 | if (!lxc_switch_uid_gid(ctx->target_ns_uid, ctx->target_ns_gid)) |
936efc72 CB |
1327 | goto on_error; |
1328 | ||
cd5f35ec CB |
1329 | put_attach_payload(ap); |
1330 | ||
a998454a | 1331 | /* We're done, so we can now do whatever the user intended us to do. */ |
afc691a0 | 1332 | _exit(attach_function(attach_function_args)); |
b75c344c CB |
1333 | |
1334 | on_error: | |
dab02267 | 1335 | ERROR("Failed to attach to container"); |
cd5f35ec | 1336 | put_attach_payload(ap); |
c7ac2e1c | 1337 | _exit(EXIT_FAILURE); |
a998454a CB |
1338 | } |
1339 | ||
f797f05e | 1340 | static int lxc_attach_terminal(const char *name, const char *lxcpath, struct lxc_conf *conf, |
9e84479f | 1341 | struct lxc_terminal *terminal) |
ba2be1a8 CB |
1342 | { |
1343 | int ret; | |
1344 | ||
9e84479f | 1345 | lxc_terminal_init(terminal); |
ba2be1a8 | 1346 | |
8ea93a0f | 1347 | ret = lxc_terminal_create(name, lxcpath, conf, terminal); |
c2af3a15 CB |
1348 | if (ret < 0) |
1349 | return log_error(-1, "Failed to create terminal"); | |
ba2be1a8 | 1350 | |
ba2be1a8 | 1351 | return 0; |
ba2be1a8 CB |
1352 | } |
1353 | ||
9e84479f | 1354 | static int lxc_attach_terminal_mainloop_init(struct lxc_terminal *terminal, |
3298b37d | 1355 | struct lxc_async_descr *descr) |
ba2be1a8 CB |
1356 | { |
1357 | int ret; | |
1358 | ||
1359 | ret = lxc_mainloop_open(descr); | |
c2af3a15 CB |
1360 | if (ret < 0) |
1361 | return log_error(-1, "Failed to create mainloop"); | |
ba2be1a8 | 1362 | |
9e84479f | 1363 | ret = lxc_terminal_mainloop_add(descr, terminal); |
ba2be1a8 | 1364 | if (ret < 0) { |
ba2be1a8 | 1365 | lxc_mainloop_close(descr); |
c2af3a15 | 1366 | return log_error(-1, "Failed to add handlers to mainloop"); |
ba2be1a8 CB |
1367 | } |
1368 | ||
1369 | return 0; | |
1370 | } | |
1371 | ||
36a94ce8 | 1372 | static inline void lxc_attach_terminal_close_ptx(struct lxc_terminal *terminal) |
ba2be1a8 | 1373 | { |
36a94ce8 | 1374 | close_prot_errno_disarm(terminal->ptx); |
ba2be1a8 CB |
1375 | } |
1376 | ||
cecf3e83 | 1377 | static inline void lxc_attach_terminal_close_pts(struct lxc_terminal *terminal) |
ba2be1a8 | 1378 | { |
41808e20 | 1379 | close_prot_errno_disarm(terminal->pty); |
ba2be1a8 CB |
1380 | } |
1381 | ||
9e84479f | 1382 | static inline void lxc_attach_terminal_close_peer(struct lxc_terminal *terminal) |
ba2be1a8 | 1383 | { |
19a3e906 | 1384 | close_prot_errno_disarm(terminal->peer); |
ba2be1a8 CB |
1385 | } |
1386 | ||
9e84479f | 1387 | static inline void lxc_attach_terminal_close_log(struct lxc_terminal *terminal) |
ba2be1a8 | 1388 | { |
19a3e906 | 1389 | close_prot_errno_disarm(terminal->log_fd); |
ba2be1a8 CB |
1390 | } |
1391 | ||
908fbc1a CB |
1392 | int lxc_attach(struct lxc_container *container, lxc_attach_exec_t exec_function, |
1393 | void *exec_payload, lxc_attach_options_t *options, | |
1394 | pid_t *attached_process) | |
9c4693b8 | 1395 | { |
6f9fe5d0 | 1396 | int ret_parent = -1; |
3298b37d | 1397 | struct lxc_async_descr descr = {}; |
a9f0cecf | 1398 | int ret; |
26abd7ea | 1399 | char *name, *lxcpath; |
9c4693b8 | 1400 | int ipc_sockets[2]; |
500ed813 | 1401 | pid_t attached_pid, pid, to_cleanup_pid; |
ab919e5f | 1402 | struct attach_context *ctx; |
9e84479f | 1403 | struct lxc_terminal terminal; |
1cce35e6 | 1404 | struct lxc_conf *conf; |
9c4693b8 | 1405 | |
908fbc1a | 1406 | if (!container) |
540a2f70 | 1407 | return ret_set_errno(-1, EINVAL); |
908fbc1a CB |
1408 | |
1409 | if (!lxc_container_get(container)) | |
540a2f70 | 1410 | return ret_set_errno(-1, EINVAL); |
908fbc1a CB |
1411 | |
1412 | name = container->name; | |
1413 | lxcpath = container->config_path; | |
1414 | ||
afc691a0 | 1415 | if (!options) { |
9c4693b8 | 1416 | options = &attach_static_default_options; |
afc691a0 CB |
1417 | options->lsm_label = NULL; |
1418 | } | |
9c4693b8 | 1419 | |
9745eb8a | 1420 | ctx = alloc_attach_context(); |
ab919e5f | 1421 | if (!ctx) { |
9745eb8a CB |
1422 | lxc_container_put(container); |
1423 | return log_error_errno(-ENOMEM, ENOMEM, "Failed to allocate attach context"); | |
1424 | } | |
1425 | ||
afc691a0 | 1426 | ret = get_attach_context(ctx, container, options); |
9745eb8a | 1427 | if (ret) { |
7e995801 | 1428 | put_attach_context(ctx); |
74ce42b5 | 1429 | return log_error(-1, "Failed to get attach context"); |
9c4693b8 CS |
1430 | } |
1431 | ||
ab919e5f | 1432 | conf = ctx->container->lxc_conf; |
ba773996 | 1433 | |
ab919e5f | 1434 | if (!fetch_seccomp(ctx->container, options)) |
ae026f55 | 1435 | WARN("Failed to get seccomp policy"); |
2c4ea790 | 1436 | |
ab919e5f | 1437 | if (!no_new_privs(ctx->container, options)) |
ae026f55 | 1438 | WARN("Could not determine whether PR_SET_NO_NEW_PRIVS is set"); |
2e812c16 | 1439 | |
9b31ab58 | 1440 | ret = prepare_namespaces(ctx, options); |
b7873c95 | 1441 | if (ret) { |
52ed870e | 1442 | put_attach_context(ctx); |
74ce42b5 | 1443 | return log_error(-1, "Failed to get namespace file descriptors"); |
9c4693b8 CS |
1444 | } |
1445 | ||
9e84479f | 1446 | if (options->attach_flags & LXC_ATTACH_TERMINAL) { |
f797f05e | 1447 | ret = lxc_attach_terminal(name, lxcpath, conf, &terminal); |
ba2be1a8 | 1448 | if (ret < 0) { |
dd53c8af | 1449 | put_attach_context(ctx); |
74ce42b5 | 1450 | return log_error(-1, "Failed to setup new terminal"); |
ba2be1a8 CB |
1451 | } |
1452 | ||
9e84479f | 1453 | terminal.log_fd = options->log_fd; |
c948657b | 1454 | } else { |
9e84479f | 1455 | lxc_terminal_init(&terminal); |
ba2be1a8 CB |
1456 | } |
1457 | ||
8ce83369 CB |
1458 | /* Create a socket pair for IPC communication; set SOCK_CLOEXEC in order |
1459 | * to make sure we don't irritate other threads that want to fork+exec | |
1460 | * away | |
9c4693b8 CS |
1461 | * |
1462 | * IMPORTANT: if the initial process is multithreaded and another call | |
1463 | * just fork()s away without exec'ing directly after, the socket fd will | |
1464 | * exist in the forked process from the other thread and any close() in | |
8ce83369 | 1465 | * our own child process will not really cause the socket to close |
4f6c7312 | 1466 | * properly, potentially causing the parent to get stuck. |
9c4693b8 CS |
1467 | * |
1468 | * For this reason, while IPC is still active, we have to use shutdown() | |
8ce83369 CB |
1469 | * if the child exits prematurely in order to signal that the socket is |
1470 | * closed and cannot assume that the child exiting will automatically do | |
1471 | * that. | |
9c4693b8 CS |
1472 | * |
1473 | * IPC mechanism: (X is receiver) | |
bd6a2355 | 1474 | * initial process transient process attached process |
9c4693b8 CS |
1475 | * X <--- send pid of |
1476 | * attached proc, | |
1477 | * then exit | |
1478 | * send 0 ------------------------------------> X | |
1479 | * [do initialization] | |
1480 | * X <------------------------------------ send 1 | |
1481 | * [add to cgroup, ...] | |
1482 | * send 2 ------------------------------------> X | |
81f466d0 CB |
1483 | * [set LXC_ATTACH_NO_NEW_PRIVS] |
1484 | * X <------------------------------------ send 3 | |
1485 | * [open LSM label fd] | |
1486 | * send 4 ------------------------------------> X | |
1487 | * [set LSM label] | |
9c4693b8 CS |
1488 | * close socket close socket |
1489 | * run program | |
1490 | */ | |
1491 | ret = socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_sockets); | |
1492 | if (ret < 0) { | |
dd53c8af | 1493 | put_attach_context(ctx); |
74ce42b5 | 1494 | return log_error_errno(-1, errno, "Could not set up required IPC mechanism for attaching"); |
9c4693b8 CS |
1495 | } |
1496 | ||
bd6a2355 | 1497 | /* Create transient process, two reasons: |
e3f0e436 | 1498 | * 1. We can't setns() in the child itself, since we want to make |
8ce83369 | 1499 | * sure we are properly attached to the pidns. |
e3f0e436 | 1500 | * 2. Also, the initial thread has to put the attached process |
8ce83369 CB |
1501 | * into the cgroup, which we can only do if we didn't already |
1502 | * setns() (otherwise, user namespaces will hate us). | |
9c4693b8 CS |
1503 | */ |
1504 | pid = fork(); | |
9c4693b8 | 1505 | if (pid < 0) { |
dd53c8af | 1506 | put_attach_context(ctx); |
74ce42b5 | 1507 | return log_error_errno(-1, errno, "Failed to create first subprocess"); |
9c4693b8 CS |
1508 | } |
1509 | ||
4f25e72f | 1510 | if (pid == 0) { |
26abd7ea | 1511 | char *cwd, *new_cwd; |
a588a482 | 1512 | |
ba2be1a8 | 1513 | /* close unneeded file descriptors */ |
4f25e72f | 1514 | close_prot_errno_disarm(ipc_sockets[0]); |
2202afc9 | 1515 | |
4f25e72f CB |
1516 | if (options->attach_flags & LXC_ATTACH_TERMINAL) { |
1517 | lxc_attach_terminal_close_ptx(&terminal); | |
1518 | lxc_attach_terminal_close_peer(&terminal); | |
1519 | lxc_attach_terminal_close_log(&terminal); | |
f4364484 SG |
1520 | } |
1521 | ||
4f25e72f | 1522 | /* Wait for the parent to have setup cgroups. */ |
6e48e7c5 | 1523 | if (!sync_wait(ipc_sockets[1], ATTACH_SYNC_CGROUP)) { |
4f25e72f | 1524 | shutdown(ipc_sockets[1], SHUT_RDWR); |
dd53c8af | 1525 | put_attach_context(ctx); |
4f25e72f | 1526 | _exit(EXIT_FAILURE); |
bb2ada6f CB |
1527 | } |
1528 | ||
c538837d CB |
1529 | if (!attach_context_security_barrier(ctx)) { |
1530 | shutdown(ipc_sockets[1], SHUT_RDWR); | |
1531 | put_attach_context(ctx); | |
1532 | _exit(EXIT_FAILURE); | |
1533 | } | |
1534 | ||
a588a482 CB |
1535 | cwd = getcwd(NULL, 0); |
1536 | ||
c538837d CB |
1537 | /* |
1538 | * Attach now, create another subprocess later, since pid | |
1539 | * namespaces only really affect the children of the current | |
1540 | * process. | |
1541 | * | |
1542 | * Note that this is a crucial barrier. We're no moving into | |
1543 | * the container's context so we need to make sure to not leak | |
1544 | * anything sensitive. That especially means things such as | |
1545 | * open file descriptors! | |
4f25e72f | 1546 | */ |
9b31ab58 | 1547 | ret = attach_namespaces(ctx, options); |
4f25e72f CB |
1548 | if (ret < 0) { |
1549 | ERROR("Failed to enter namespaces"); | |
1550 | shutdown(ipc_sockets[1], SHUT_RDWR); | |
dd53c8af | 1551 | put_attach_context(ctx); |
4f25e72f | 1552 | _exit(EXIT_FAILURE); |
ba2be1a8 CB |
1553 | } |
1554 | ||
4f25e72f CB |
1555 | /* Attach succeeded, try to cwd. */ |
1556 | if (options->initial_cwd) | |
1557 | new_cwd = options->initial_cwd; | |
1558 | else | |
1559 | new_cwd = cwd; | |
1560 | if (new_cwd) { | |
1561 | ret = chdir(new_cwd); | |
1562 | if (ret < 0) | |
1563 | WARN("Could not change directory to \"%s\"", new_cwd); | |
ba2be1a8 | 1564 | } |
a588a482 | 1565 | free_disarm(cwd); |
c6d09e15 | 1566 | |
4f25e72f | 1567 | /* Create attached process. */ |
4f25e72f CB |
1568 | pid = lxc_raw_clone(CLONE_PARENT, NULL); |
1569 | if (pid < 0) { | |
1570 | SYSERROR("Failed to clone attached process"); | |
1571 | shutdown(ipc_sockets[1], SHUT_RDWR); | |
dd53c8af | 1572 | put_attach_context(ctx); |
4f25e72f CB |
1573 | _exit(EXIT_FAILURE); |
1574 | } | |
f4364484 | 1575 | |
4f25e72f | 1576 | if (pid == 0) { |
338b230f | 1577 | struct attach_payload ap = { |
a64902ab CB |
1578 | .ipc_socket = ipc_sockets[1], |
1579 | .options = options, | |
1580 | .ctx = ctx, | |
1581 | .terminal_pts_fd = terminal.pty, | |
1582 | .exec_function = exec_function, | |
1583 | .exec_payload = exec_payload, | |
1584 | }; | |
1585 | ||
4f25e72f CB |
1586 | if (options->attach_flags & LXC_ATTACH_TERMINAL) { |
1587 | ret = lxc_terminal_signal_sigmask_safe_blocked(&terminal); | |
1588 | if (ret < 0) { | |
1589 | SYSERROR("Failed to reset signal mask"); | |
1590 | _exit(EXIT_FAILURE); | |
1591 | } | |
1592 | } | |
ea918412 | 1593 | |
a64902ab | 1594 | /* Does not return. */ |
338b230f | 1595 | do_attach(&ap); |
62183f1a | 1596 | } |
bd6a2355 | 1597 | TRACE("Attached process %d started initializing", pid); |
2eef2bda | 1598 | |
4f25e72f CB |
1599 | if (options->attach_flags & LXC_ATTACH_TERMINAL) |
1600 | lxc_attach_terminal_close_pts(&terminal); | |
ea918412 | 1601 | |
4f25e72f | 1602 | /* Tell grandparent the pid of the pid of the newly created child. */ |
8723f88e | 1603 | if (!sync_wake_pid(ipc_sockets[1], pid)) { |
4f25e72f CB |
1604 | /* If this really happens here, this is very unfortunate, since |
1605 | * the parent will not know the pid of the attached process and | |
1606 | * will not be able to wait for it (and we won't either due to | |
1607 | * CLONE_PARENT) so the parent won't be able to reap it and the | |
1608 | * attached process will remain a zombie. | |
1609 | */ | |
1610 | shutdown(ipc_sockets[1], SHUT_RDWR); | |
dd53c8af | 1611 | put_attach_context(ctx); |
4f25e72f CB |
1612 | _exit(EXIT_FAILURE); |
1613 | } | |
9c4693b8 | 1614 | |
4f25e72f | 1615 | /* The rest is in the hands of the initial and the attached process. */ |
dd53c8af | 1616 | put_attach_context(ctx); |
4f25e72f CB |
1617 | _exit(EXIT_SUCCESS); |
1618 | } | |
bd6a2355 | 1619 | TRACE("Transient process %d started initializing", pid); |
6f4f1937 | 1620 | |
4f25e72f | 1621 | to_cleanup_pid = pid; |
ea918412 | 1622 | |
4f25e72f | 1623 | /* close unneeded file descriptors */ |
cb2420df | 1624 | close_prot_errno_disarm(ipc_sockets[1]); |
9b31ab58 | 1625 | put_namespaces(ctx); |
4f25e72f CB |
1626 | if (options->attach_flags & LXC_ATTACH_TERMINAL) |
1627 | lxc_attach_terminal_close_pts(&terminal); | |
81f466d0 | 1628 | |
4f25e72f CB |
1629 | /* Attach to cgroup, if requested. */ |
1630 | if (options->attach_flags & LXC_ATTACH_MOVE_TO_CGROUP) { | |
1631 | /* | |
1632 | * If this is the unified hierarchy cgroup_attach() is | |
1633 | * enough. | |
1634 | */ | |
1635 | ret = cgroup_attach(conf, name, lxcpath, pid); | |
9a57778b | 1636 | if (ret) { |
4f25e72f | 1637 | call_cleaner(cgroup_exit) struct cgroup_ops *cgroup_ops = NULL; |
f740bc63 | 1638 | if (!ERRNO_IS_NOT_SUPPORTED(ret)) { |
9a57778b CB |
1639 | SYSERROR("Failed to attach cgroup"); |
1640 | goto on_error; | |
1641 | } | |
1642 | ||
4f25e72f CB |
1643 | cgroup_ops = cgroup_init(conf); |
1644 | if (!cgroup_ops) | |
1645 | goto on_error; | |
9044b79e | 1646 | |
4f25e72f CB |
1647 | if (!cgroup_ops->attach(cgroup_ops, conf, name, lxcpath, pid)) |
1648 | goto on_error; | |
81f466d0 | 1649 | } |
9a57778b | 1650 | |
bd6a2355 | 1651 | TRACE("Moved transient process %d into container cgroup", pid); |
4f25e72f | 1652 | } |
81f466d0 | 1653 | |
6ee13f5b CB |
1654 | /* |
1655 | * Close sensitive file descriptors we don't need anymore. Even if | |
1656 | * we're the parent. | |
1657 | */ | |
1658 | if (!attach_context_security_barrier(ctx)) | |
1659 | goto on_error; | |
1660 | ||
4f25e72f | 1661 | /* Setup /proc limits */ |
91d04bf9 CB |
1662 | ret = setup_proc_filesystem(conf, pid); |
1663 | if (ret < 0) | |
1664 | goto on_error; | |
cdb2a47f | 1665 | |
4f25e72f | 1666 | /* Setup resource limits */ |
223797c3 CB |
1667 | ret = setup_resource_limits(conf, pid); |
1668 | if (ret < 0) | |
1669 | goto on_error; | |
cdb2a47f | 1670 | |
4f25e72f CB |
1671 | if (options->attach_flags & LXC_ATTACH_TERMINAL) { |
1672 | ret = lxc_attach_terminal_mainloop_init(&terminal, &descr); | |
1673 | if (ret < 0) | |
1674 | goto on_error; | |
9c4693b8 | 1675 | |
4f25e72f CB |
1676 | TRACE("Initialized terminal mainloop"); |
1677 | } | |
9c4693b8 | 1678 | |
4f25e72f | 1679 | /* Let the child process know to go ahead. */ |
6e48e7c5 | 1680 | if (!sync_wake(ipc_sockets[0], ATTACH_SYNC_CGROUP)) |
4f25e72f | 1681 | goto close_mainloop; |
ba2be1a8 | 1682 | |
bd6a2355 | 1683 | TRACE("Told transient process to start initializing"); |
ea918412 | 1684 | |
bd6a2355 | 1685 | /* Get pid of attached process from transient process. */ |
8723f88e | 1686 | if (!sync_wait_pid(ipc_sockets[0], &attached_pid)) |
4f25e72f | 1687 | goto close_mainloop; |
ba2be1a8 | 1688 | |
4f25e72f | 1689 | TRACE("Received pid %d of attached process in parent pid namespace", attached_pid); |
ba2be1a8 | 1690 | |
4f25e72f | 1691 | /* Ignore SIGKILL (CTRL-C) and SIGQUIT (CTRL-\) - issue #313. */ |
5d2b46fb | 1692 | if (options->stdin_fd == STDIN_FILENO) { |
4f25e72f CB |
1693 | signal(SIGINT, SIG_IGN); |
1694 | signal(SIGQUIT, SIG_IGN); | |
1695 | } | |
ba2be1a8 | 1696 | |
bd6a2355 | 1697 | /* Reap transient process. */ |
4f25e72f CB |
1698 | ret = wait_for_pid(pid); |
1699 | if (ret < 0) | |
1700 | goto close_mainloop; | |
ba2be1a8 | 1701 | |
bd6a2355 | 1702 | TRACE("Transient process %d exited", pid); |
ea918412 | 1703 | |
4f25e72f CB |
1704 | /* We will always have to reap the attached process now. */ |
1705 | to_cleanup_pid = attached_pid; | |
9c4693b8 | 1706 | |
4f25e72f | 1707 | /* Open LSM fd and send it to child. */ |
afc691a0 | 1708 | if (attach_lsm(options) && ctx->lsm_label) { |
8723f88e | 1709 | __do_close int fd_lsm = -EBADF; |
4f25e72f | 1710 | bool on_exec; |
ea918412 | 1711 | |
4f25e72f | 1712 | on_exec = options->attach_flags & LXC_ATTACH_LSM_EXEC ? true : false; |
8723f88e CB |
1713 | fd_lsm = ctx->lsm_ops->process_label_fd_get(ctx->lsm_ops, attached_pid, on_exec); |
1714 | if (fd_lsm < 0) | |
4f25e72f | 1715 | goto close_mainloop; |
9c4693b8 | 1716 | |
8723f88e | 1717 | TRACE("Opened LSM label file descriptor %d", fd_lsm); |
ea918412 | 1718 | |
4f25e72f | 1719 | /* Send child fd of the LSM security module to write to. */ |
8723f88e | 1720 | if (!sync_wake_fd(ipc_sockets[0], fd_lsm)) { |
6e36c297 | 1721 | SYSERROR("Failed to send lsm label fd"); |
4f25e72f CB |
1722 | goto close_mainloop; |
1723 | } | |
1724 | ||
8723f88e | 1725 | TRACE("Sent LSM label file descriptor %d to child", fd_lsm); |
9c4693b8 | 1726 | } |
ea918412 | 1727 | |
4f25e72f CB |
1728 | if (conf->seccomp.seccomp) { |
1729 | ret = lxc_seccomp_recv_notifier_fd(&conf->seccomp, ipc_sockets[0]); | |
1730 | if (ret < 0) | |
1731 | goto close_mainloop; | |
9c4693b8 | 1732 | |
4f25e72f | 1733 | ret = lxc_seccomp_add_notifier(name, lxcpath, &conf->seccomp); |
d6d979bc | 1734 | if (ret < 0) |
4f25e72f | 1735 | goto close_mainloop; |
d6d979bc | 1736 | } |
9c4693b8 | 1737 | |
4f25e72f CB |
1738 | /* We're done, the child process should now execute whatever it |
1739 | * is that the user requested. The parent can now track it with | |
1740 | * waitpid() or similar. | |
1741 | */ | |
9c4693b8 | 1742 | |
4f25e72f | 1743 | *attached_process = attached_pid; |
a998454a | 1744 | |
4f25e72f CB |
1745 | /* Now shut down communication with child, we're done. */ |
1746 | shutdown(ipc_sockets[0], SHUT_RDWR); | |
cb2420df | 1747 | close_prot_errno_disarm(ipc_sockets[0]); |
f157b056 | 1748 | |
4f25e72f CB |
1749 | ret_parent = 0; |
1750 | to_cleanup_pid = -1; | |
ea918412 | 1751 | |
4f25e72f CB |
1752 | if (options->attach_flags & LXC_ATTACH_TERMINAL) { |
1753 | ret = lxc_mainloop(&descr, -1); | |
1754 | if (ret < 0) { | |
1755 | ret_parent = -1; | |
1756 | to_cleanup_pid = attached_pid; | |
1757 | } | |
a998454a | 1758 | } |
ea918412 | 1759 | |
4f25e72f | 1760 | close_mainloop: |
9e84479f | 1761 | if (options->attach_flags & LXC_ATTACH_TERMINAL) |
4f25e72f | 1762 | lxc_mainloop_close(&descr); |
9c4693b8 | 1763 | |
4f25e72f CB |
1764 | on_error: |
1765 | if (ipc_sockets[0] >= 0) { | |
1766 | shutdown(ipc_sockets[0], SHUT_RDWR); | |
cb2420df | 1767 | close_prot_errno_disarm(ipc_sockets[0]); |
9c4693b8 | 1768 | } |
ea918412 | 1769 | |
4f25e72f CB |
1770 | if (to_cleanup_pid > 0) |
1771 | (void)wait_for_pid(to_cleanup_pid); | |
1772 | ||
1773 | if (options->attach_flags & LXC_ATTACH_TERMINAL) { | |
1774 | lxc_terminal_delete(&terminal); | |
1775 | lxc_terminal_conf_free(&terminal); | |
1776 | } | |
9c4693b8 | 1777 | |
dd53c8af | 1778 | put_attach_context(ctx); |
4f25e72f | 1779 | return ret_parent; |
9c4693b8 CS |
1780 | } |
1781 | ||
06346bb0 | 1782 | int lxc_attach_run_command(void *payload) |
9c4693b8 | 1783 | { |
06346bb0 CB |
1784 | int ret = -1; |
1785 | lxc_attach_command_t *cmd = payload; | |
9c4693b8 | 1786 | |
06346bb0 CB |
1787 | ret = execvp(cmd->program, cmd->argv); |
1788 | if (ret < 0) { | |
1789 | switch (errno) { | |
1790 | case ENOEXEC: | |
1791 | ret = 126; | |
cf0fd972 | 1792 | break; |
06346bb0 CB |
1793 | case ENOENT: |
1794 | ret = 127; | |
cf0fd972 | 1795 | break; |
06346bb0 CB |
1796 | } |
1797 | } | |
ea918412 | 1798 | |
c2af3a15 | 1799 | return log_error_errno(ret, errno, "Failed to exec \"%s\"", cmd->program); |
9c4693b8 CS |
1800 | } |
1801 | ||
1802 | int lxc_attach_run_shell(void* payload) | |
1803 | { | |
cd8f5663 | 1804 | __do_free char *buf = NULL; |
9c4693b8 | 1805 | uid_t uid; |
cb7aa5e8 DJ |
1806 | struct passwd pwent; |
1807 | struct passwd *pwentp = NULL; | |
9c4693b8 | 1808 | char *user_shell; |
cb7aa5e8 DJ |
1809 | size_t bufsize; |
1810 | int ret; | |
9c4693b8 | 1811 | |
8ce83369 | 1812 | /* Ignore payload parameter. */ |
9c4693b8 CS |
1813 | (void)payload; |
1814 | ||
1815 | uid = getuid(); | |
cb7aa5e8 DJ |
1816 | |
1817 | bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); | |
1818 | if (bufsize == -1) | |
1819 | bufsize = 1024; | |
1820 | ||
1821 | buf = malloc(bufsize); | |
1822 | if (buf) { | |
1823 | ret = getpwuid_r(uid, &pwent, buf, bufsize, &pwentp); | |
1824 | if (!pwentp) { | |
1825 | if (ret == 0) | |
ea918412 | 1826 | WARN("Could not find matched password record"); |
cb7aa5e8 DJ |
1827 | |
1828 | WARN("Failed to get password record - %u", uid); | |
1829 | } | |
1830 | } | |
9c4693b8 | 1831 | |
8ce83369 CB |
1832 | /* This probably happens because of incompatible nss implementations in |
1833 | * host and container (remember, this code is still using the host's | |
1834 | * glibc but our mount namespace is in the container) we may try to get | |
1835 | * the information by spawning a [getent passwd uid] process and parsing | |
1836 | * the result. | |
9c4693b8 | 1837 | */ |
cb7aa5e8 | 1838 | if (!pwentp) |
9c4693b8 CS |
1839 | user_shell = lxc_attach_getpwshell(uid); |
1840 | else | |
cb7aa5e8 | 1841 | user_shell = pwent.pw_shell; |
ea918412 | 1842 | |
9c4693b8 | 1843 | if (user_shell) |
acf47e1b | 1844 | execlp(user_shell, user_shell, (char *)NULL); |
9c4693b8 | 1845 | |
8ce83369 CB |
1846 | /* Executed if either no passwd entry or execvp fails, we will fall back |
1847 | * on /bin/sh as a default shell. | |
9c4693b8 | 1848 | */ |
acf47e1b | 1849 | execlp("/bin/sh", "/bin/sh", (char *)NULL); |
ea918412 | 1850 | |
edeb1836 | 1851 | SYSERROR("Failed to execute shell"); |
cb7aa5e8 | 1852 | if (!pwentp) |
edeb1836 | 1853 | free(user_shell); |
ea918412 | 1854 | |
9c4693b8 CS |
1855 | return -1; |
1856 | } |