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Commit | Line | Data |
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5cb5a6ff LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
2 | ||
a7334b09 LP |
3 | /*** |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
5cb5a6ff | 22 | #include <assert.h> |
034c6ed7 LP |
23 | #include <dirent.h> |
24 | #include <errno.h> | |
25 | #include <fcntl.h> | |
26 | #include <unistd.h> | |
44d8db9e | 27 | #include <string.h> |
309bff19 | 28 | #include <signal.h> |
071830ff LP |
29 | #include <sys/socket.h> |
30 | #include <sys/un.h> | |
94f04347 | 31 | #include <sys/prctl.h> |
66ee3769 | 32 | #include <linux/sched.h> |
451a074f LP |
33 | #include <sys/types.h> |
34 | #include <sys/stat.h> | |
81a2b7ce LP |
35 | #include <grp.h> |
36 | #include <pwd.h> | |
5cb5a6ff LP |
37 | |
38 | #include "execute.h" | |
39 | #include "strv.h" | |
40 | #include "macro.h" | |
41 | #include "util.h" | |
acbb0225 | 42 | #include "log.h" |
9eba9da4 | 43 | #include "ioprio.h" |
94f04347 | 44 | #include "securebits.h" |
8e274523 | 45 | #include "cgroup.h" |
5cb5a6ff | 46 | |
034c6ed7 LP |
47 | static int close_fds(int except[], unsigned n_except) { |
48 | DIR *d; | |
49 | struct dirent *de; | |
50 | int r = 0; | |
51 | ||
52 | /* Modifies the fds array! (sorts it) */ | |
53 | ||
54 | if (!(d = opendir("/proc/self/fd"))) | |
55 | return -errno; | |
56 | ||
57 | while ((de = readdir(d))) { | |
58 | int fd; | |
59 | ||
60 | if (de->d_name[0] == '.') | |
61 | continue; | |
62 | ||
63 | if ((r = safe_atoi(de->d_name, &fd)) < 0) | |
64 | goto finish; | |
65 | ||
66 | if (fd < 3) | |
67 | continue; | |
68 | ||
69 | if (fd == dirfd(d)) | |
70 | continue; | |
71 | ||
72 | if (except) { | |
73 | bool found; | |
74 | unsigned i; | |
75 | ||
76 | found = false; | |
77 | for (i = 0; i < n_except; i++) | |
78 | if (except[i] == fd) { | |
79 | found = true; | |
80 | break; | |
81 | } | |
82 | ||
83 | if (found) | |
84 | continue; | |
85 | } | |
86 | ||
87 | if ((r = close_nointr(fd)) < 0) | |
88 | goto finish; | |
89 | } | |
90 | ||
91 | finish: | |
92 | closedir(d); | |
93 | return r; | |
94 | } | |
95 | ||
96 | static int shift_fds(int fds[], unsigned n_fds) { | |
97 | int start, restart_from; | |
98 | ||
99 | if (n_fds <= 0) | |
100 | return 0; | |
101 | ||
102 | assert(fds); | |
103 | ||
104 | start = 0; | |
105 | for (;;) { | |
106 | int i; | |
107 | ||
108 | restart_from = -1; | |
109 | ||
110 | for (i = start; i < (int) n_fds; i++) { | |
111 | int nfd; | |
112 | ||
113 | /* Already at right index? */ | |
114 | if (fds[i] == i+3) | |
115 | continue; | |
116 | ||
117 | if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0) | |
118 | return -errno; | |
119 | ||
2da3263a | 120 | assert_se(close_nointr(fds[i]) == 0); |
034c6ed7 LP |
121 | fds[i] = nfd; |
122 | ||
123 | /* Hmm, the fd we wanted isn't free? Then | |
124 | * let's remember that and try again from here*/ | |
125 | if (nfd != i+3 && restart_from < 0) | |
126 | restart_from = i; | |
127 | } | |
128 | ||
129 | if (restart_from < 0) | |
130 | break; | |
131 | ||
132 | start = restart_from; | |
133 | } | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
451a074f | 138 | static int flags_fds(int fds[], unsigned n_fds, bool nonblock) { |
47a71eed | 139 | unsigned i; |
e2c76839 | 140 | int r; |
47a71eed LP |
141 | |
142 | if (n_fds <= 0) | |
143 | return 0; | |
144 | ||
145 | assert(fds); | |
146 | ||
451a074f | 147 | /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */ |
47a71eed LP |
148 | |
149 | for (i = 0; i < n_fds; i++) { | |
47a71eed | 150 | |
e2c76839 LP |
151 | if ((r = fd_nonblock(fds[i], nonblock)) < 0) |
152 | return r; | |
47a71eed | 153 | |
451a074f LP |
154 | /* We unconditionally drop FD_CLOEXEC from the fds, |
155 | * since after all we want to pass these fds to our | |
156 | * children */ | |
47a71eed | 157 | |
e2c76839 LP |
158 | if ((r = fd_cloexec(fds[i], false)) < 0) |
159 | return r; | |
47a71eed LP |
160 | } |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
071830ff LP |
165 | static int replace_null_fd(int fd, int flags) { |
166 | int nfd; | |
167 | assert(fd >= 0); | |
168 | ||
169 | close_nointr(fd); | |
170 | ||
171 | if ((nfd = open("/dev/null", flags|O_NOCTTY)) < 0) | |
172 | return -errno; | |
173 | ||
174 | if (nfd != fd) { | |
175 | close_nointr_nofail(nfd); | |
176 | return -EIO; | |
177 | } | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | static int setup_output(const ExecContext *context, const char *ident) { | |
183 | int r; | |
184 | ||
185 | assert(context); | |
186 | ||
187 | switch (context->output) { | |
188 | ||
94f04347 | 189 | case EXEC_OUTPUT_CONSOLE: |
071830ff LP |
190 | return 0; |
191 | ||
94f04347 | 192 | case EXEC_OUTPUT_NULL: |
071830ff | 193 | |
94f04347 | 194 | if ((r = replace_null_fd(STDOUT_FILENO, O_WRONLY)) < 0 || |
071830ff LP |
195 | (r = replace_null_fd(STDERR_FILENO, O_WRONLY)) < 0) |
196 | return r; | |
197 | ||
198 | return 0; | |
199 | ||
94f04347 LP |
200 | case EXEC_OUTPUT_KERNEL: |
201 | case EXEC_OUTPUT_SYSLOG: { | |
071830ff LP |
202 | |
203 | int fd; | |
204 | union { | |
205 | struct sockaddr sa; | |
206 | struct sockaddr_un un; | |
207 | } sa; | |
208 | ||
071830ff LP |
209 | close_nointr(STDOUT_FILENO); |
210 | close_nointr(STDERR_FILENO); | |
211 | ||
212 | if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) | |
213 | return -errno; | |
214 | ||
215 | if (fd != STDOUT_FILENO) { | |
216 | close_nointr_nofail(fd); | |
217 | return -EIO; | |
218 | } | |
219 | ||
220 | zero(sa); | |
221 | sa.sa.sa_family = AF_UNIX; | |
222 | strncpy(sa.un.sun_path+1, LOGGER_SOCKET, sizeof(sa.un.sun_path)-1); | |
223 | ||
224 | if (connect(fd, &sa.sa, sizeof(sa)) < 0) { | |
225 | close_nointr_nofail(fd); | |
226 | return -errno; | |
227 | } | |
228 | ||
229 | if (shutdown(fd, SHUT_RD) < 0) { | |
230 | close_nointr_nofail(fd); | |
231 | return -errno; | |
232 | } | |
233 | ||
234 | if ((fd = dup(fd)) < 0) { | |
235 | close_nointr_nofail(fd); | |
236 | return -errno; | |
237 | } | |
238 | ||
239 | if (fd != STDERR_FILENO) { | |
240 | close_nointr_nofail(fd); | |
241 | return -EIO; | |
242 | } | |
243 | ||
244 | /* We speak a very simple protocol between log server | |
245 | * and client: one line for the log destination (kmsg | |
246 | * or syslog), followed by the priority field, | |
247 | * followed by the process name. Since we replaced | |
248 | * stdin/stderr we simple use stdio to write to | |
249 | * it. Note that we use stderr, to minimize buffer | |
250 | * flushing issues. */ | |
251 | ||
252 | fprintf(stderr, | |
253 | "%s\n" | |
254 | "%i\n" | |
255 | "%s\n", | |
94f04347 | 256 | context->output == EXEC_OUTPUT_KERNEL ? "kmsg" : "syslog", |
071830ff LP |
257 | context->syslog_priority, |
258 | context->syslog_identifier ? context->syslog_identifier : ident); | |
259 | ||
260 | return 0; | |
261 | } | |
94f04347 LP |
262 | |
263 | default: | |
264 | assert_not_reached("Unknown output type"); | |
071830ff | 265 | } |
94f04347 LP |
266 | } |
267 | ||
47be870b | 268 | static int setup_input(const ExecContext *context) { |
94f04347 LP |
269 | int r; |
270 | ||
271 | assert(context); | |
071830ff | 272 | |
94f04347 LP |
273 | switch (context->input) { |
274 | ||
275 | case EXEC_INPUT_CONSOLE: | |
276 | return 0; | |
277 | ||
278 | case EXEC_INPUT_NULL: | |
279 | if ((r = replace_null_fd(STDIN_FILENO, O_RDONLY)) < 0) | |
280 | return r; | |
281 | ||
282 | return 0; | |
283 | ||
284 | default: | |
285 | assert_not_reached("Unknown input type"); | |
286 | } | |
071830ff LP |
287 | } |
288 | ||
81a2b7ce LP |
289 | static int get_group_creds(const char *groupname, gid_t *gid) { |
290 | struct group *g; | |
291 | unsigned long lu; | |
292 | ||
293 | assert(groupname); | |
294 | assert(gid); | |
295 | ||
296 | /* We enforce some special rules for gid=0: in order to avoid | |
297 | * NSS lookups for root we hardcode its data. */ | |
298 | ||
299 | if (streq(groupname, "root") || streq(groupname, "0")) { | |
300 | *gid = 0; | |
301 | return 0; | |
302 | } | |
303 | ||
304 | if (safe_atolu(groupname, &lu) >= 0) { | |
305 | errno = 0; | |
306 | g = getgrgid((gid_t) lu); | |
307 | } else { | |
308 | errno = 0; | |
309 | g = getgrnam(groupname); | |
310 | } | |
311 | ||
312 | if (!g) | |
313 | return errno != 0 ? -errno : -ESRCH; | |
314 | ||
315 | *gid = g->gr_gid; | |
316 | return 0; | |
317 | } | |
318 | ||
319 | static int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) { | |
320 | struct passwd *p; | |
321 | unsigned long lu; | |
322 | ||
323 | assert(username); | |
324 | assert(*username); | |
325 | assert(uid); | |
326 | assert(gid); | |
327 | assert(home); | |
328 | ||
329 | /* We enforce some special rules for uid=0: in order to avoid | |
330 | * NSS lookups for root we hardcode its data. */ | |
331 | ||
332 | if (streq(*username, "root") || streq(*username, "0")) { | |
333 | *username = "root"; | |
334 | *uid = 0; | |
335 | *gid = 0; | |
336 | *home = "/root"; | |
337 | return 0; | |
338 | } | |
339 | ||
340 | if (safe_atolu(*username, &lu) >= 0) { | |
341 | errno = 0; | |
342 | p = getpwuid((uid_t) lu); | |
343 | ||
344 | /* If there are multiple users with the same id, make | |
345 | * sure to leave $USER to the configured value instead | |
346 | * of the first occurence in the database. However if | |
347 | * the uid was configured by a numeric uid, then let's | |
348 | * pick the real username from /etc/passwd. */ | |
349 | if (*username && p) | |
350 | *username = p->pw_name; | |
351 | } else { | |
352 | errno = 0; | |
353 | p = getpwnam(*username); | |
354 | } | |
355 | ||
356 | if (!p) | |
357 | return errno != 0 ? -errno : -ESRCH; | |
358 | ||
359 | *uid = p->pw_uid; | |
360 | *gid = p->pw_gid; | |
361 | *home = p->pw_dir; | |
362 | return 0; | |
363 | } | |
364 | ||
365 | static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) { | |
366 | bool keep_groups = false; | |
367 | int r; | |
368 | ||
369 | assert(context); | |
370 | ||
371 | /* Lookup and ser GID and supplementary group list. Here too | |
372 | * we avoid NSS lookups for gid=0. */ | |
373 | ||
374 | if (context->group || username) { | |
375 | ||
376 | if (context->group) | |
377 | if ((r = get_group_creds(context->group, &gid)) < 0) | |
378 | return r; | |
379 | ||
380 | /* First step, initialize groups from /etc/groups */ | |
381 | if (username && gid != 0) { | |
382 | if (initgroups(username, gid) < 0) | |
383 | return -errno; | |
384 | ||
385 | keep_groups = true; | |
386 | } | |
387 | ||
388 | /* Second step, set our gids */ | |
389 | if (setresgid(gid, gid, gid) < 0) | |
390 | return -errno; | |
391 | } | |
392 | ||
393 | if (context->supplementary_groups) { | |
394 | int ngroups_max, k; | |
395 | gid_t *gids; | |
396 | char **i; | |
397 | ||
398 | /* Final step, initialize any manually set supplementary groups */ | |
399 | ngroups_max = (int) sysconf(_SC_NGROUPS_MAX); | |
400 | ||
401 | if (!(gids = new(gid_t, ngroups_max))) | |
402 | return -ENOMEM; | |
403 | ||
404 | if (keep_groups) { | |
405 | if ((k = getgroups(ngroups_max, gids)) < 0) { | |
406 | free(gids); | |
407 | return -errno; | |
408 | } | |
409 | } else | |
410 | k = 0; | |
411 | ||
412 | STRV_FOREACH(i, context->supplementary_groups) { | |
413 | ||
414 | if (k >= ngroups_max) { | |
415 | free(gids); | |
416 | return -E2BIG; | |
417 | } | |
418 | ||
419 | if ((r = get_group_creds(*i, gids+k)) < 0) { | |
420 | free(gids); | |
421 | return r; | |
422 | } | |
423 | ||
424 | k++; | |
425 | } | |
426 | ||
427 | if (setgroups(k, gids) < 0) { | |
428 | free(gids); | |
429 | return -errno; | |
430 | } | |
431 | ||
432 | free(gids); | |
433 | } | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | static int enforce_user(const ExecContext *context, uid_t uid) { | |
439 | int r; | |
440 | assert(context); | |
441 | ||
442 | /* Sets (but doesn't lookup) the uid and make sure we keep the | |
443 | * capabilities while doing so. */ | |
444 | ||
445 | if (context->capabilities) { | |
446 | cap_t d; | |
447 | static const cap_value_t bits[] = { | |
448 | CAP_SETUID, /* Necessary so that we can run setresuid() below */ | |
449 | CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */ | |
450 | }; | |
451 | ||
452 | /* First step: If we need to keep capabilities but | |
453 | * drop privileges we need to make sure we keep our | |
454 | * caps, whiel we drop priviliges. */ | |
693ced48 LP |
455 | if (uid != 0) { |
456 | int sb = context->secure_bits|SECURE_KEEP_CAPS; | |
457 | ||
458 | if (prctl(PR_GET_SECUREBITS) != sb) | |
459 | if (prctl(PR_SET_SECUREBITS, sb) < 0) | |
460 | return -errno; | |
461 | } | |
81a2b7ce LP |
462 | |
463 | /* Second step: set the capabilites. This will reduce | |
464 | * the capabilities to the minimum we need. */ | |
465 | ||
466 | if (!(d = cap_dup(context->capabilities))) | |
467 | return -errno; | |
468 | ||
469 | if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 || | |
470 | cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) { | |
471 | r = -errno; | |
472 | cap_free(d); | |
473 | return r; | |
474 | } | |
475 | ||
476 | if (cap_set_proc(d) < 0) { | |
477 | r = -errno; | |
478 | cap_free(d); | |
479 | return r; | |
480 | } | |
481 | ||
482 | cap_free(d); | |
483 | } | |
484 | ||
485 | /* Third step: actually set the uids */ | |
486 | if (setresuid(uid, uid, uid) < 0) | |
487 | return -errno; | |
488 | ||
489 | /* At this point we should have all necessary capabilities but | |
490 | are otherwise a normal user. However, the caps might got | |
491 | corrupted due to the setresuid() so we need clean them up | |
492 | later. This is done outside of this call. */ | |
493 | ||
494 | return 0; | |
495 | } | |
496 | ||
497 | int exec_spawn(const ExecCommand *command, | |
498 | const ExecContext *context, | |
499 | int *fds, unsigned n_fds, | |
500 | bool apply_permissions, | |
501 | bool apply_chroot, | |
8e274523 | 502 | CGroupBonding *cgroup_bondings, |
81a2b7ce LP |
503 | pid_t *ret) { |
504 | ||
034c6ed7 | 505 | pid_t pid; |
8e274523 | 506 | int r; |
034c6ed7 | 507 | |
5cb5a6ff LP |
508 | assert(command); |
509 | assert(context); | |
510 | assert(ret); | |
034c6ed7 LP |
511 | assert(fds || n_fds <= 0); |
512 | ||
81a2b7ce | 513 | log_debug("About to execute %s", command->path); |
acbb0225 | 514 | |
8e274523 LP |
515 | if (cgroup_bondings) |
516 | if ((r = cgroup_bonding_realize_list(cgroup_bondings))) | |
517 | return r; | |
518 | ||
034c6ed7 LP |
519 | if ((pid = fork()) < 0) |
520 | return -errno; | |
521 | ||
522 | if (pid == 0) { | |
8e274523 | 523 | int i; |
309bff19 | 524 | sigset_t ss; |
81a2b7ce LP |
525 | const char *username = NULL, *home = NULL; |
526 | uid_t uid = (uid_t) -1; | |
527 | gid_t gid = (gid_t) -1; | |
528 | char **our_env = NULL, **final_env = NULL; | |
529 | unsigned n_env = 0; | |
309bff19 | 530 | |
034c6ed7 | 531 | /* child */ |
5cb5a6ff | 532 | |
309bff19 LP |
533 | if (sigemptyset(&ss) < 0 || |
534 | sigprocmask(SIG_SETMASK, &ss, NULL) < 0) { | |
535 | r = EXIT_SIGNAL_MASK; | |
536 | goto fail; | |
537 | } | |
538 | ||
9eba9da4 LP |
539 | if (setpgid(0, 0) < 0) { |
540 | r = EXIT_PGID; | |
034c6ed7 LP |
541 | goto fail; |
542 | } | |
543 | ||
9eba9da4 LP |
544 | umask(context->umask); |
545 | ||
94f04347 LP |
546 | if (setup_input(context) < 0) { |
547 | r = EXIT_INPUT; | |
548 | goto fail; | |
549 | } | |
550 | ||
071830ff LP |
551 | if (setup_output(context, file_name_from_path(command->path)) < 0) { |
552 | r = EXIT_OUTPUT; | |
553 | goto fail; | |
554 | } | |
555 | ||
8e274523 LP |
556 | if (cgroup_bondings) |
557 | if ((r = cgroup_bonding_install_list(cgroup_bondings, 0)) < 0) { | |
558 | r = EXIT_CGROUP; | |
559 | goto fail; | |
560 | } | |
561 | ||
fb33a393 LP |
562 | if (context->oom_adjust_set) { |
563 | char t[16]; | |
034c6ed7 | 564 | |
fb33a393 LP |
565 | snprintf(t, sizeof(t), "%i", context->oom_adjust); |
566 | char_array_0(t); | |
034c6ed7 | 567 | |
fb33a393 LP |
568 | if (write_one_line_file("/proc/self/oom_adj", t) < 0) { |
569 | r = EXIT_OOM_ADJUST; | |
570 | goto fail; | |
571 | } | |
034c6ed7 LP |
572 | } |
573 | ||
fb33a393 LP |
574 | if (context->nice_set) |
575 | if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) { | |
576 | r = EXIT_NICE; | |
577 | goto fail; | |
578 | } | |
579 | ||
94f04347 LP |
580 | if (context->cpu_sched_set) { |
581 | struct sched_param param; | |
582 | ||
583 | zero(param); | |
584 | param.sched_priority = context->cpu_sched_priority; | |
585 | ||
38b48754 LP |
586 | if (sched_setscheduler(0, context->cpu_sched_policy | |
587 | (context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), ¶m) < 0) { | |
94f04347 LP |
588 | r = EXIT_SETSCHEDULER; |
589 | goto fail; | |
590 | } | |
591 | } | |
592 | ||
593 | if (context->cpu_affinity_set) | |
594 | if (sched_setaffinity(0, sizeof(context->cpu_affinity), &context->cpu_affinity) < 0) { | |
595 | r = EXIT_CPUAFFINITY; | |
596 | goto fail; | |
597 | } | |
598 | ||
9eba9da4 LP |
599 | if (context->ioprio_set) |
600 | if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) { | |
601 | r = EXIT_IOPRIO; | |
602 | goto fail; | |
603 | } | |
604 | ||
94f04347 LP |
605 | if (context->timer_slack_ns_set) |
606 | if (prctl(PR_SET_TIMERSLACK, context->timer_slack_ns_set) < 0) { | |
607 | r = EXIT_TIMERSLACK; | |
608 | goto fail; | |
609 | } | |
610 | ||
81a2b7ce LP |
611 | if (context->user) { |
612 | username = context->user; | |
613 | if (get_user_creds(&username, &uid, &gid, &home) < 0) { | |
614 | r = EXIT_USER; | |
615 | goto fail; | |
616 | } | |
617 | } | |
618 | ||
619 | if (apply_permissions) | |
620 | if (enforce_groups(context, username, uid) < 0) { | |
621 | r = EXIT_GROUP; | |
622 | goto fail; | |
623 | } | |
624 | ||
625 | if (apply_chroot) { | |
626 | if (context->root_directory) | |
627 | if (chroot(context->root_directory) < 0) { | |
628 | r = EXIT_CHROOT; | |
629 | goto fail; | |
630 | } | |
631 | ||
632 | if (chdir(context->working_directory ? context->working_directory : "/") < 0) { | |
633 | r = EXIT_CHDIR; | |
634 | goto fail; | |
635 | } | |
636 | } else { | |
637 | ||
638 | char *d; | |
639 | ||
640 | if (asprintf(&d, "%s/%s", | |
641 | context->root_directory ? context->root_directory : "", | |
642 | context->working_directory ? context->working_directory : "") < 0) { | |
643 | r = EXIT_MEMORY; | |
644 | goto fail; | |
645 | } | |
646 | ||
647 | if (chdir(d) < 0) { | |
648 | free(d); | |
649 | r = EXIT_CHDIR; | |
650 | goto fail; | |
651 | } | |
652 | ||
653 | free(d); | |
654 | } | |
655 | ||
034c6ed7 | 656 | if (close_fds(fds, n_fds) < 0 || |
47a71eed | 657 | shift_fds(fds, n_fds) < 0 || |
451a074f | 658 | flags_fds(fds, n_fds, context->non_blocking) < 0) { |
034c6ed7 LP |
659 | r = EXIT_FDS; |
660 | goto fail; | |
661 | } | |
662 | ||
81a2b7ce | 663 | if (apply_permissions) { |
034c6ed7 | 664 | |
81a2b7ce LP |
665 | for (i = 0; i < RLIMIT_NLIMITS; i++) { |
666 | if (!context->rlimit[i]) | |
667 | continue; | |
668 | ||
669 | if (setrlimit(i, context->rlimit[i]) < 0) { | |
670 | r = EXIT_LIMITS; | |
671 | goto fail; | |
672 | } | |
034c6ed7 | 673 | } |
034c6ed7 | 674 | |
81a2b7ce LP |
675 | if (context->user) |
676 | if (enforce_user(context, uid) < 0) { | |
677 | r = EXIT_USER; | |
678 | goto fail; | |
679 | } | |
680 | ||
693ced48 LP |
681 | /* PR_GET_SECUREBITS is not priviliged, while |
682 | * PR_SET_SECUREBITS is. So to suppress | |
683 | * potential EPERMs we'll try not to call | |
684 | * PR_SET_SECUREBITS unless necessary. */ | |
685 | if (prctl(PR_GET_SECUREBITS) != context->secure_bits) | |
686 | if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) { | |
687 | r = EXIT_SECUREBITS; | |
688 | goto fail; | |
689 | } | |
81a2b7ce LP |
690 | |
691 | if (context->capabilities) | |
692 | if (cap_set_proc(context->capabilities) < 0) { | |
693 | r = EXIT_CAPABILITIES; | |
694 | goto fail; | |
695 | } | |
94f04347 LP |
696 | } |
697 | ||
81a2b7ce LP |
698 | if (!(our_env = new0(char*, 6))) { |
699 | r = EXIT_MEMORY; | |
700 | goto fail; | |
701 | } | |
034c6ed7 | 702 | |
81a2b7ce LP |
703 | if (n_fds > 0) |
704 | if (asprintf(our_env + n_env++, "LISTEN_PID=%llu", (unsigned long long) getpid()) < 0 || | |
705 | asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0) { | |
706 | r = EXIT_MEMORY; | |
707 | goto fail; | |
708 | } | |
034c6ed7 | 709 | |
81a2b7ce LP |
710 | if (home) |
711 | if (asprintf(our_env + n_env++, "HOME=%s", home) < 0) { | |
712 | r = EXIT_MEMORY; | |
713 | goto fail; | |
714 | } | |
034c6ed7 | 715 | |
81a2b7ce LP |
716 | if (username) |
717 | if (asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 || | |
718 | asprintf(our_env + n_env++, "USER=%s", username) < 0) { | |
719 | r = EXIT_MEMORY; | |
720 | goto fail; | |
721 | } | |
034c6ed7 | 722 | |
81a2b7ce LP |
723 | if (!(final_env = strv_env_merge(environ, our_env, context->environment, NULL))) { |
724 | r = EXIT_MEMORY; | |
725 | goto fail; | |
726 | } | |
034c6ed7 | 727 | |
81a2b7ce | 728 | execve(command->path, command->argv, final_env); |
034c6ed7 LP |
729 | r = EXIT_EXEC; |
730 | ||
731 | fail: | |
81a2b7ce LP |
732 | strv_free(our_env); |
733 | strv_free(final_env); | |
734 | ||
034c6ed7 LP |
735 | _exit(r); |
736 | } | |
737 | ||
2da3263a | 738 | |
81a2b7ce | 739 | log_debug("Forked %s as %llu", command->path, (unsigned long long) pid); |
2da3263a | 740 | |
034c6ed7 | 741 | *ret = pid; |
5cb5a6ff LP |
742 | return 0; |
743 | } | |
744 | ||
034c6ed7 LP |
745 | void exec_context_init(ExecContext *c) { |
746 | assert(c); | |
747 | ||
748 | c->umask = 0002; | |
034c6ed7 | 749 | c->oom_adjust = 0; |
9eba9da4 | 750 | c->oom_adjust_set = false; |
034c6ed7 | 751 | c->nice = 0; |
9eba9da4 LP |
752 | c->nice_set = false; |
753 | c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0); | |
754 | c->ioprio_set = false; | |
94f04347 LP |
755 | c->cpu_sched_policy = SCHED_OTHER; |
756 | c->cpu_sched_priority = 0; | |
757 | c->cpu_sched_set = false; | |
758 | CPU_ZERO(&c->cpu_affinity); | |
759 | c->cpu_affinity_set = false; | |
071830ff | 760 | |
94f04347 | 761 | c->input = 0; |
071830ff LP |
762 | c->output = 0; |
763 | c->syslog_priority = LOG_DAEMON|LOG_INFO; | |
94f04347 LP |
764 | |
765 | c->secure_bits = 0; | |
766 | c->capability_bounding_set_drop = 0; | |
034c6ed7 LP |
767 | } |
768 | ||
769 | void exec_context_done(ExecContext *c) { | |
5cb5a6ff LP |
770 | unsigned l; |
771 | ||
772 | assert(c); | |
773 | ||
774 | strv_free(c->environment); | |
034c6ed7 | 775 | c->environment = NULL; |
5cb5a6ff | 776 | |
034c6ed7 | 777 | for (l = 0; l < ELEMENTSOF(c->rlimit); l++) { |
5cb5a6ff | 778 | free(c->rlimit[l]); |
034c6ed7 LP |
779 | c->rlimit[l] = NULL; |
780 | } | |
781 | ||
9eba9da4 LP |
782 | free(c->working_directory); |
783 | c->working_directory = NULL; | |
784 | free(c->root_directory); | |
785 | c->root_directory = NULL; | |
5cb5a6ff | 786 | |
071830ff LP |
787 | free(c->syslog_identifier); |
788 | c->syslog_identifier = NULL; | |
789 | ||
5cb5a6ff | 790 | free(c->user); |
034c6ed7 LP |
791 | c->user = NULL; |
792 | ||
5cb5a6ff | 793 | free(c->group); |
034c6ed7 LP |
794 | c->group = NULL; |
795 | ||
796 | strv_free(c->supplementary_groups); | |
797 | c->supplementary_groups = NULL; | |
94f04347 LP |
798 | |
799 | if (c->capabilities) { | |
800 | cap_free(c->capabilities); | |
801 | c->capabilities = NULL; | |
802 | } | |
5cb5a6ff LP |
803 | } |
804 | ||
805 | void exec_command_free_list(ExecCommand *c) { | |
806 | ExecCommand *i; | |
807 | ||
808 | while ((i = c)) { | |
034c6ed7 | 809 | LIST_REMOVE(ExecCommand, command, c, i); |
5cb5a6ff LP |
810 | |
811 | free(i->path); | |
44d8db9e | 812 | strv_free(i->argv); |
5cb5a6ff LP |
813 | free(i); |
814 | } | |
815 | } | |
816 | ||
034c6ed7 LP |
817 | void exec_command_free_array(ExecCommand **c, unsigned n) { |
818 | unsigned i; | |
819 | ||
820 | for (i = 0; i < n; i++) { | |
821 | exec_command_free_list(c[i]); | |
822 | c[i] = NULL; | |
823 | } | |
824 | } | |
825 | ||
5cb5a6ff | 826 | void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { |
94f04347 LP |
827 | char ** e; |
828 | unsigned i; | |
9eba9da4 | 829 | |
5cb5a6ff LP |
830 | assert(c); |
831 | assert(f); | |
832 | ||
833 | if (!prefix) | |
834 | prefix = ""; | |
835 | ||
836 | fprintf(f, | |
94f04347 LP |
837 | "%sUMask: %04o\n" |
838 | "%sWorkingDirectory: %s\n" | |
451a074f LP |
839 | "%sRootDirectory: %s\n" |
840 | "%sNonBlocking: %s\n", | |
5cb5a6ff | 841 | prefix, c->umask, |
9eba9da4 | 842 | prefix, c->working_directory ? c->working_directory : "/", |
451a074f LP |
843 | prefix, c->root_directory ? c->root_directory : "/", |
844 | prefix, yes_no(c->non_blocking)); | |
fb33a393 | 845 | |
94f04347 LP |
846 | if (c->environment) |
847 | for (e = c->environment; *e; e++) | |
848 | fprintf(f, "%sEnvironment: %s\n", prefix, *e); | |
849 | ||
fb33a393 LP |
850 | if (c->nice_set) |
851 | fprintf(f, | |
852 | "%sNice: %i\n", | |
853 | prefix, c->nice); | |
854 | ||
855 | if (c->oom_adjust_set) | |
856 | fprintf(f, | |
857 | "%sOOMAdjust: %i\n", | |
858 | prefix, c->oom_adjust); | |
9eba9da4 | 859 | |
94f04347 LP |
860 | for (i = 0; i < RLIM_NLIMITS; i++) |
861 | if (c->rlimit[i]) | |
ea430986 | 862 | fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max); |
94f04347 | 863 | |
9eba9da4 LP |
864 | if (c->ioprio_set) |
865 | fprintf(f, | |
866 | "%sIOSchedulingClass: %s\n" | |
867 | "%sIOPriority: %i\n", | |
94f04347 | 868 | prefix, ioprio_class_to_string(IOPRIO_PRIO_CLASS(c->ioprio)), |
9eba9da4 | 869 | prefix, (int) IOPRIO_PRIO_DATA(c->ioprio)); |
94f04347 LP |
870 | |
871 | if (c->cpu_sched_set) | |
872 | fprintf(f, | |
873 | "%sCPUSchedulingPolicy: %s\n" | |
38b48754 LP |
874 | "%sCPUSchedulingPriority: %i\n" |
875 | "%sCPUSchedulingResetOnFork: %s\n", | |
94f04347 | 876 | prefix, sched_policy_to_string(c->cpu_sched_policy), |
38b48754 LP |
877 | prefix, c->cpu_sched_priority, |
878 | prefix, yes_no(c->cpu_sched_reset_on_fork)); | |
94f04347 LP |
879 | |
880 | if (c->cpu_affinity_set) { | |
881 | fprintf(f, "%sCPUAffinity:", prefix); | |
882 | for (i = 0; i < CPU_SETSIZE; i++) | |
883 | if (CPU_ISSET(i, &c->cpu_affinity)) | |
884 | fprintf(f, " %i", i); | |
885 | fputs("\n", f); | |
886 | } | |
887 | ||
888 | if (c->timer_slack_ns_set) | |
889 | fprintf(f, "%sTimerSlackNS: %lu\n", prefix, c->timer_slack_ns); | |
890 | ||
891 | fprintf(f, | |
892 | "%sInput: %s\n" | |
893 | "%sOutput: %s\n", | |
894 | prefix, exec_input_to_string(c->input), | |
895 | prefix, exec_output_to_string(c->output)); | |
896 | ||
897 | if (c->output == EXEC_OUTPUT_SYSLOG || c->output == EXEC_OUTPUT_KERNEL) | |
898 | fprintf(f, | |
899 | "%sSyslogFacility: %s\n" | |
900 | "%sSyslogLevel: %s\n", | |
901 | prefix, log_facility_to_string(LOG_FAC(c->syslog_priority)), | |
902 | prefix, log_level_to_string(LOG_PRI(c->syslog_priority))); | |
903 | ||
904 | if (c->capabilities) { | |
905 | char *t; | |
906 | if ((t = cap_to_text(c->capabilities, NULL))) { | |
907 | fprintf(f, "%sCapabilities: %s\n", | |
908 | prefix, t); | |
909 | cap_free(t); | |
910 | } | |
911 | } | |
912 | ||
913 | if (c->secure_bits) | |
914 | fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n", | |
915 | prefix, | |
916 | (c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "", | |
917 | (c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "", | |
918 | (c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "", | |
919 | (c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "", | |
920 | (c->secure_bits & SECURE_NOROOT) ? " noroot" : "", | |
921 | (c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : ""); | |
922 | ||
923 | if (c->capability_bounding_set_drop) { | |
924 | fprintf(f, "%sCapabilityBoundingSetDrop:", prefix); | |
925 | ||
926 | for (i = 0; i <= CAP_LAST_CAP; i++) | |
927 | if (c->capability_bounding_set_drop & (1 << i)) { | |
928 | char *t; | |
929 | ||
930 | if ((t = cap_to_name(i))) { | |
931 | fprintf(f, " %s", t); | |
932 | free(t); | |
933 | } | |
934 | } | |
935 | ||
936 | fputs("\n", f); | |
937 | } | |
938 | ||
939 | if (c->user) | |
940 | fprintf(f, "%sUser: %s", prefix, c->user); | |
941 | if (c->group) | |
942 | fprintf(f, "%sGroup: %s", prefix, c->group); | |
943 | ||
944 | if (c->supplementary_groups) { | |
945 | char **g; | |
946 | ||
947 | fprintf(f, "%sSupplementaryGroups:", prefix); | |
948 | ||
949 | STRV_FOREACH(g, c->supplementary_groups) | |
950 | fprintf(f, " %s", *g); | |
951 | ||
952 | fputs("\n", f); | |
953 | } | |
5cb5a6ff LP |
954 | } |
955 | ||
034c6ed7 LP |
956 | void exec_status_fill(ExecStatus *s, pid_t pid, int code, int status) { |
957 | assert(s); | |
5cb5a6ff | 958 | |
034c6ed7 LP |
959 | s->pid = pid; |
960 | s->code = code; | |
961 | s->status = status; | |
962 | s->timestamp = now(CLOCK_REALTIME); | |
5cb5a6ff | 963 | } |
44d8db9e LP |
964 | |
965 | char *exec_command_line(ExecCommand *c) { | |
966 | size_t k; | |
967 | char *n, *p, **a; | |
968 | bool first = true; | |
969 | ||
970 | assert(c); | |
971 | assert(c->argv); | |
972 | ||
9164977d | 973 | k = 1; |
44d8db9e LP |
974 | STRV_FOREACH(a, c->argv) |
975 | k += strlen(*a)+3; | |
976 | ||
977 | if (!(n = new(char, k))) | |
978 | return NULL; | |
979 | ||
980 | p = n; | |
981 | STRV_FOREACH(a, c->argv) { | |
982 | ||
983 | if (!first) | |
984 | *(p++) = ' '; | |
985 | else | |
986 | first = false; | |
987 | ||
988 | if (strpbrk(*a, WHITESPACE)) { | |
989 | *(p++) = '\''; | |
990 | p = stpcpy(p, *a); | |
991 | *(p++) = '\''; | |
992 | } else | |
993 | p = stpcpy(p, *a); | |
994 | ||
995 | } | |
996 | ||
9164977d LP |
997 | *p = 0; |
998 | ||
44d8db9e LP |
999 | /* FIXME: this doesn't really handle arguments that have |
1000 | * spaces and ticks in them */ | |
1001 | ||
1002 | return n; | |
1003 | } | |
1004 | ||
1005 | void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) { | |
1006 | char *cmd; | |
1007 | ||
1008 | assert(c); | |
1009 | assert(f); | |
1010 | ||
1011 | if (!prefix) | |
1012 | prefix = ""; | |
1013 | ||
1014 | cmd = exec_command_line(c); | |
1015 | ||
1016 | fprintf(f, | |
1017 | "%sCommand Line: %s\n", | |
1018 | prefix, cmd ? cmd : strerror(ENOMEM)); | |
1019 | ||
1020 | free(cmd); | |
1021 | } | |
1022 | ||
1023 | void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) { | |
1024 | assert(f); | |
1025 | ||
1026 | if (!prefix) | |
1027 | prefix = ""; | |
1028 | ||
1029 | LIST_FOREACH(command, c, c) | |
1030 | exec_command_dump(c, f, prefix); | |
1031 | } | |
94f04347 | 1032 | |
a6a80b4f LP |
1033 | void exec_command_append_list(ExecCommand **l, ExecCommand *e) { |
1034 | ExecCommand *end; | |
1035 | ||
1036 | assert(l); | |
1037 | assert(e); | |
1038 | ||
1039 | if (*l) { | |
1040 | /* It's kinda important that we keep the order here */ | |
1041 | LIST_FIND_TAIL(ExecCommand, command, *l, end); | |
1042 | LIST_INSERT_AFTER(ExecCommand, command, *l, end, e); | |
1043 | } else | |
1044 | *l = e; | |
1045 | } | |
1046 | ||
94f04347 LP |
1047 | static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = { |
1048 | [EXEC_OUTPUT_CONSOLE] = "console", | |
1049 | [EXEC_OUTPUT_NULL] = "null", | |
1050 | [EXEC_OUTPUT_SYSLOG] = "syslog", | |
1051 | [EXEC_OUTPUT_KERNEL] = "kernel" | |
1052 | }; | |
1053 | ||
1054 | DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput); | |
1055 | ||
1056 | static const char* const exec_input_table[_EXEC_INPUT_MAX] = { | |
1057 | [EXEC_INPUT_NULL] = "null", | |
1058 | [EXEC_INPUT_CONSOLE] = "console" | |
1059 | }; | |
1060 | ||
1061 | DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput); |