]>
Commit | Line | Data |
---|---|---|
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 LP |
139 | unsigned i; |
140 | ||
141 | if (n_fds <= 0) | |
142 | return 0; | |
143 | ||
144 | assert(fds); | |
145 | ||
451a074f | 146 | /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */ |
47a71eed LP |
147 | |
148 | for (i = 0; i < n_fds; i++) { | |
149 | int flags; | |
150 | ||
151 | if ((flags = fcntl(fds[i], F_GETFL, 0)) < 0) | |
152 | return -errno; | |
153 | ||
451a074f LP |
154 | if (nonblock) |
155 | flags |= O_NONBLOCK; | |
156 | else | |
157 | flags &= ~O_NONBLOCK; | |
47a71eed | 158 | |
451a074f | 159 | if (fcntl(fds[i], F_SETFL, flags) < 0) |
47a71eed LP |
160 | return -errno; |
161 | ||
451a074f LP |
162 | /* We unconditionally drop FD_CLOEXEC from the fds, |
163 | * since after all we want to pass these fds to our | |
164 | * children */ | |
47a71eed LP |
165 | if ((flags = fcntl(fds[i], F_GETFD, 0)) < 0) |
166 | return -errno; | |
167 | ||
47a71eed LP |
168 | if (fcntl(fds[i], F_SETFD, flags &~FD_CLOEXEC) < 0) |
169 | return -errno; | |
170 | } | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
071830ff LP |
175 | static int replace_null_fd(int fd, int flags) { |
176 | int nfd; | |
177 | assert(fd >= 0); | |
178 | ||
179 | close_nointr(fd); | |
180 | ||
181 | if ((nfd = open("/dev/null", flags|O_NOCTTY)) < 0) | |
182 | return -errno; | |
183 | ||
184 | if (nfd != fd) { | |
185 | close_nointr_nofail(nfd); | |
186 | return -EIO; | |
187 | } | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
192 | static int setup_output(const ExecContext *context, const char *ident) { | |
193 | int r; | |
194 | ||
195 | assert(context); | |
196 | ||
197 | switch (context->output) { | |
198 | ||
94f04347 | 199 | case EXEC_OUTPUT_CONSOLE: |
071830ff LP |
200 | return 0; |
201 | ||
94f04347 | 202 | case EXEC_OUTPUT_NULL: |
071830ff | 203 | |
94f04347 | 204 | if ((r = replace_null_fd(STDOUT_FILENO, O_WRONLY)) < 0 || |
071830ff LP |
205 | (r = replace_null_fd(STDERR_FILENO, O_WRONLY)) < 0) |
206 | return r; | |
207 | ||
208 | return 0; | |
209 | ||
94f04347 LP |
210 | case EXEC_OUTPUT_KERNEL: |
211 | case EXEC_OUTPUT_SYSLOG: { | |
071830ff LP |
212 | |
213 | int fd; | |
214 | union { | |
215 | struct sockaddr sa; | |
216 | struct sockaddr_un un; | |
217 | } sa; | |
218 | ||
071830ff LP |
219 | close_nointr(STDOUT_FILENO); |
220 | close_nointr(STDERR_FILENO); | |
221 | ||
222 | if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) | |
223 | return -errno; | |
224 | ||
225 | if (fd != STDOUT_FILENO) { | |
226 | close_nointr_nofail(fd); | |
227 | return -EIO; | |
228 | } | |
229 | ||
230 | zero(sa); | |
231 | sa.sa.sa_family = AF_UNIX; | |
232 | strncpy(sa.un.sun_path+1, LOGGER_SOCKET, sizeof(sa.un.sun_path)-1); | |
233 | ||
234 | if (connect(fd, &sa.sa, sizeof(sa)) < 0) { | |
235 | close_nointr_nofail(fd); | |
236 | return -errno; | |
237 | } | |
238 | ||
239 | if (shutdown(fd, SHUT_RD) < 0) { | |
240 | close_nointr_nofail(fd); | |
241 | return -errno; | |
242 | } | |
243 | ||
244 | if ((fd = dup(fd)) < 0) { | |
245 | close_nointr_nofail(fd); | |
246 | return -errno; | |
247 | } | |
248 | ||
249 | if (fd != STDERR_FILENO) { | |
250 | close_nointr_nofail(fd); | |
251 | return -EIO; | |
252 | } | |
253 | ||
254 | /* We speak a very simple protocol between log server | |
255 | * and client: one line for the log destination (kmsg | |
256 | * or syslog), followed by the priority field, | |
257 | * followed by the process name. Since we replaced | |
258 | * stdin/stderr we simple use stdio to write to | |
259 | * it. Note that we use stderr, to minimize buffer | |
260 | * flushing issues. */ | |
261 | ||
262 | fprintf(stderr, | |
263 | "%s\n" | |
264 | "%i\n" | |
265 | "%s\n", | |
94f04347 | 266 | context->output == EXEC_OUTPUT_KERNEL ? "kmsg" : "syslog", |
071830ff LP |
267 | context->syslog_priority, |
268 | context->syslog_identifier ? context->syslog_identifier : ident); | |
269 | ||
270 | return 0; | |
271 | } | |
94f04347 LP |
272 | |
273 | default: | |
274 | assert_not_reached("Unknown output type"); | |
071830ff | 275 | } |
94f04347 LP |
276 | } |
277 | ||
47be870b | 278 | static int setup_input(const ExecContext *context) { |
94f04347 LP |
279 | int r; |
280 | ||
281 | assert(context); | |
071830ff | 282 | |
94f04347 LP |
283 | switch (context->input) { |
284 | ||
285 | case EXEC_INPUT_CONSOLE: | |
286 | return 0; | |
287 | ||
288 | case EXEC_INPUT_NULL: | |
289 | if ((r = replace_null_fd(STDIN_FILENO, O_RDONLY)) < 0) | |
290 | return r; | |
291 | ||
292 | return 0; | |
293 | ||
294 | default: | |
295 | assert_not_reached("Unknown input type"); | |
296 | } | |
071830ff LP |
297 | } |
298 | ||
81a2b7ce LP |
299 | static int get_group_creds(const char *groupname, gid_t *gid) { |
300 | struct group *g; | |
301 | unsigned long lu; | |
302 | ||
303 | assert(groupname); | |
304 | assert(gid); | |
305 | ||
306 | /* We enforce some special rules for gid=0: in order to avoid | |
307 | * NSS lookups for root we hardcode its data. */ | |
308 | ||
309 | if (streq(groupname, "root") || streq(groupname, "0")) { | |
310 | *gid = 0; | |
311 | return 0; | |
312 | } | |
313 | ||
314 | if (safe_atolu(groupname, &lu) >= 0) { | |
315 | errno = 0; | |
316 | g = getgrgid((gid_t) lu); | |
317 | } else { | |
318 | errno = 0; | |
319 | g = getgrnam(groupname); | |
320 | } | |
321 | ||
322 | if (!g) | |
323 | return errno != 0 ? -errno : -ESRCH; | |
324 | ||
325 | *gid = g->gr_gid; | |
326 | return 0; | |
327 | } | |
328 | ||
329 | static int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) { | |
330 | struct passwd *p; | |
331 | unsigned long lu; | |
332 | ||
333 | assert(username); | |
334 | assert(*username); | |
335 | assert(uid); | |
336 | assert(gid); | |
337 | assert(home); | |
338 | ||
339 | /* We enforce some special rules for uid=0: in order to avoid | |
340 | * NSS lookups for root we hardcode its data. */ | |
341 | ||
342 | if (streq(*username, "root") || streq(*username, "0")) { | |
343 | *username = "root"; | |
344 | *uid = 0; | |
345 | *gid = 0; | |
346 | *home = "/root"; | |
347 | return 0; | |
348 | } | |
349 | ||
350 | if (safe_atolu(*username, &lu) >= 0) { | |
351 | errno = 0; | |
352 | p = getpwuid((uid_t) lu); | |
353 | ||
354 | /* If there are multiple users with the same id, make | |
355 | * sure to leave $USER to the configured value instead | |
356 | * of the first occurence in the database. However if | |
357 | * the uid was configured by a numeric uid, then let's | |
358 | * pick the real username from /etc/passwd. */ | |
359 | if (*username && p) | |
360 | *username = p->pw_name; | |
361 | } else { | |
362 | errno = 0; | |
363 | p = getpwnam(*username); | |
364 | } | |
365 | ||
366 | if (!p) | |
367 | return errno != 0 ? -errno : -ESRCH; | |
368 | ||
369 | *uid = p->pw_uid; | |
370 | *gid = p->pw_gid; | |
371 | *home = p->pw_dir; | |
372 | return 0; | |
373 | } | |
374 | ||
375 | static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) { | |
376 | bool keep_groups = false; | |
377 | int r; | |
378 | ||
379 | assert(context); | |
380 | ||
381 | /* Lookup and ser GID and supplementary group list. Here too | |
382 | * we avoid NSS lookups for gid=0. */ | |
383 | ||
384 | if (context->group || username) { | |
385 | ||
386 | if (context->group) | |
387 | if ((r = get_group_creds(context->group, &gid)) < 0) | |
388 | return r; | |
389 | ||
390 | /* First step, initialize groups from /etc/groups */ | |
391 | if (username && gid != 0) { | |
392 | if (initgroups(username, gid) < 0) | |
393 | return -errno; | |
394 | ||
395 | keep_groups = true; | |
396 | } | |
397 | ||
398 | /* Second step, set our gids */ | |
399 | if (setresgid(gid, gid, gid) < 0) | |
400 | return -errno; | |
401 | } | |
402 | ||
403 | if (context->supplementary_groups) { | |
404 | int ngroups_max, k; | |
405 | gid_t *gids; | |
406 | char **i; | |
407 | ||
408 | /* Final step, initialize any manually set supplementary groups */ | |
409 | ngroups_max = (int) sysconf(_SC_NGROUPS_MAX); | |
410 | ||
411 | if (!(gids = new(gid_t, ngroups_max))) | |
412 | return -ENOMEM; | |
413 | ||
414 | if (keep_groups) { | |
415 | if ((k = getgroups(ngroups_max, gids)) < 0) { | |
416 | free(gids); | |
417 | return -errno; | |
418 | } | |
419 | } else | |
420 | k = 0; | |
421 | ||
422 | STRV_FOREACH(i, context->supplementary_groups) { | |
423 | ||
424 | if (k >= ngroups_max) { | |
425 | free(gids); | |
426 | return -E2BIG; | |
427 | } | |
428 | ||
429 | if ((r = get_group_creds(*i, gids+k)) < 0) { | |
430 | free(gids); | |
431 | return r; | |
432 | } | |
433 | ||
434 | k++; | |
435 | } | |
436 | ||
437 | if (setgroups(k, gids) < 0) { | |
438 | free(gids); | |
439 | return -errno; | |
440 | } | |
441 | ||
442 | free(gids); | |
443 | } | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
448 | static int enforce_user(const ExecContext *context, uid_t uid) { | |
449 | int r; | |
450 | assert(context); | |
451 | ||
452 | /* Sets (but doesn't lookup) the uid and make sure we keep the | |
453 | * capabilities while doing so. */ | |
454 | ||
455 | if (context->capabilities) { | |
456 | cap_t d; | |
457 | static const cap_value_t bits[] = { | |
458 | CAP_SETUID, /* Necessary so that we can run setresuid() below */ | |
459 | CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */ | |
460 | }; | |
461 | ||
462 | /* First step: If we need to keep capabilities but | |
463 | * drop privileges we need to make sure we keep our | |
464 | * caps, whiel we drop priviliges. */ | |
693ced48 LP |
465 | if (uid != 0) { |
466 | int sb = context->secure_bits|SECURE_KEEP_CAPS; | |
467 | ||
468 | if (prctl(PR_GET_SECUREBITS) != sb) | |
469 | if (prctl(PR_SET_SECUREBITS, sb) < 0) | |
470 | return -errno; | |
471 | } | |
81a2b7ce LP |
472 | |
473 | /* Second step: set the capabilites. This will reduce | |
474 | * the capabilities to the minimum we need. */ | |
475 | ||
476 | if (!(d = cap_dup(context->capabilities))) | |
477 | return -errno; | |
478 | ||
479 | if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 || | |
480 | cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) { | |
481 | r = -errno; | |
482 | cap_free(d); | |
483 | return r; | |
484 | } | |
485 | ||
486 | if (cap_set_proc(d) < 0) { | |
487 | r = -errno; | |
488 | cap_free(d); | |
489 | return r; | |
490 | } | |
491 | ||
492 | cap_free(d); | |
493 | } | |
494 | ||
495 | /* Third step: actually set the uids */ | |
496 | if (setresuid(uid, uid, uid) < 0) | |
497 | return -errno; | |
498 | ||
499 | /* At this point we should have all necessary capabilities but | |
500 | are otherwise a normal user. However, the caps might got | |
501 | corrupted due to the setresuid() so we need clean them up | |
502 | later. This is done outside of this call. */ | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
507 | int exec_spawn(const ExecCommand *command, | |
508 | const ExecContext *context, | |
509 | int *fds, unsigned n_fds, | |
510 | bool apply_permissions, | |
511 | bool apply_chroot, | |
8e274523 | 512 | CGroupBonding *cgroup_bondings, |
81a2b7ce LP |
513 | pid_t *ret) { |
514 | ||
034c6ed7 | 515 | pid_t pid; |
8e274523 | 516 | int r; |
034c6ed7 | 517 | |
5cb5a6ff LP |
518 | assert(command); |
519 | assert(context); | |
520 | assert(ret); | |
034c6ed7 LP |
521 | assert(fds || n_fds <= 0); |
522 | ||
81a2b7ce | 523 | log_debug("About to execute %s", command->path); |
acbb0225 | 524 | |
8e274523 LP |
525 | if (cgroup_bondings) |
526 | if ((r = cgroup_bonding_realize_list(cgroup_bondings))) | |
527 | return r; | |
528 | ||
034c6ed7 LP |
529 | if ((pid = fork()) < 0) |
530 | return -errno; | |
531 | ||
532 | if (pid == 0) { | |
8e274523 | 533 | int i; |
309bff19 | 534 | sigset_t ss; |
81a2b7ce LP |
535 | const char *username = NULL, *home = NULL; |
536 | uid_t uid = (uid_t) -1; | |
537 | gid_t gid = (gid_t) -1; | |
538 | char **our_env = NULL, **final_env = NULL; | |
539 | unsigned n_env = 0; | |
309bff19 | 540 | |
034c6ed7 | 541 | /* child */ |
5cb5a6ff | 542 | |
309bff19 LP |
543 | if (sigemptyset(&ss) < 0 || |
544 | sigprocmask(SIG_SETMASK, &ss, NULL) < 0) { | |
545 | r = EXIT_SIGNAL_MASK; | |
546 | goto fail; | |
547 | } | |
548 | ||
9eba9da4 LP |
549 | if (setpgid(0, 0) < 0) { |
550 | r = EXIT_PGID; | |
034c6ed7 LP |
551 | goto fail; |
552 | } | |
553 | ||
9eba9da4 LP |
554 | umask(context->umask); |
555 | ||
94f04347 LP |
556 | if (setup_input(context) < 0) { |
557 | r = EXIT_INPUT; | |
558 | goto fail; | |
559 | } | |
560 | ||
071830ff LP |
561 | if (setup_output(context, file_name_from_path(command->path)) < 0) { |
562 | r = EXIT_OUTPUT; | |
563 | goto fail; | |
564 | } | |
565 | ||
8e274523 LP |
566 | if (cgroup_bondings) |
567 | if ((r = cgroup_bonding_install_list(cgroup_bondings, 0)) < 0) { | |
568 | r = EXIT_CGROUP; | |
569 | goto fail; | |
570 | } | |
571 | ||
fb33a393 LP |
572 | if (context->oom_adjust_set) { |
573 | char t[16]; | |
034c6ed7 | 574 | |
fb33a393 LP |
575 | snprintf(t, sizeof(t), "%i", context->oom_adjust); |
576 | char_array_0(t); | |
034c6ed7 | 577 | |
fb33a393 LP |
578 | if (write_one_line_file("/proc/self/oom_adj", t) < 0) { |
579 | r = EXIT_OOM_ADJUST; | |
580 | goto fail; | |
581 | } | |
034c6ed7 LP |
582 | } |
583 | ||
fb33a393 LP |
584 | if (context->nice_set) |
585 | if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) { | |
586 | r = EXIT_NICE; | |
587 | goto fail; | |
588 | } | |
589 | ||
94f04347 LP |
590 | if (context->cpu_sched_set) { |
591 | struct sched_param param; | |
592 | ||
593 | zero(param); | |
594 | param.sched_priority = context->cpu_sched_priority; | |
595 | ||
38b48754 LP |
596 | if (sched_setscheduler(0, context->cpu_sched_policy | |
597 | (context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), ¶m) < 0) { | |
94f04347 LP |
598 | r = EXIT_SETSCHEDULER; |
599 | goto fail; | |
600 | } | |
601 | } | |
602 | ||
603 | if (context->cpu_affinity_set) | |
604 | if (sched_setaffinity(0, sizeof(context->cpu_affinity), &context->cpu_affinity) < 0) { | |
605 | r = EXIT_CPUAFFINITY; | |
606 | goto fail; | |
607 | } | |
608 | ||
9eba9da4 LP |
609 | if (context->ioprio_set) |
610 | if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) { | |
611 | r = EXIT_IOPRIO; | |
612 | goto fail; | |
613 | } | |
614 | ||
94f04347 LP |
615 | if (context->timer_slack_ns_set) |
616 | if (prctl(PR_SET_TIMERSLACK, context->timer_slack_ns_set) < 0) { | |
617 | r = EXIT_TIMERSLACK; | |
618 | goto fail; | |
619 | } | |
620 | ||
81a2b7ce LP |
621 | if (context->user) { |
622 | username = context->user; | |
623 | if (get_user_creds(&username, &uid, &gid, &home) < 0) { | |
624 | r = EXIT_USER; | |
625 | goto fail; | |
626 | } | |
627 | } | |
628 | ||
629 | if (apply_permissions) | |
630 | if (enforce_groups(context, username, uid) < 0) { | |
631 | r = EXIT_GROUP; | |
632 | goto fail; | |
633 | } | |
634 | ||
635 | if (apply_chroot) { | |
636 | if (context->root_directory) | |
637 | if (chroot(context->root_directory) < 0) { | |
638 | r = EXIT_CHROOT; | |
639 | goto fail; | |
640 | } | |
641 | ||
642 | if (chdir(context->working_directory ? context->working_directory : "/") < 0) { | |
643 | r = EXIT_CHDIR; | |
644 | goto fail; | |
645 | } | |
646 | } else { | |
647 | ||
648 | char *d; | |
649 | ||
650 | if (asprintf(&d, "%s/%s", | |
651 | context->root_directory ? context->root_directory : "", | |
652 | context->working_directory ? context->working_directory : "") < 0) { | |
653 | r = EXIT_MEMORY; | |
654 | goto fail; | |
655 | } | |
656 | ||
657 | if (chdir(d) < 0) { | |
658 | free(d); | |
659 | r = EXIT_CHDIR; | |
660 | goto fail; | |
661 | } | |
662 | ||
663 | free(d); | |
664 | } | |
665 | ||
034c6ed7 | 666 | if (close_fds(fds, n_fds) < 0 || |
47a71eed | 667 | shift_fds(fds, n_fds) < 0 || |
451a074f | 668 | flags_fds(fds, n_fds, context->non_blocking) < 0) { |
034c6ed7 LP |
669 | r = EXIT_FDS; |
670 | goto fail; | |
671 | } | |
672 | ||
81a2b7ce | 673 | if (apply_permissions) { |
034c6ed7 | 674 | |
81a2b7ce LP |
675 | for (i = 0; i < RLIMIT_NLIMITS; i++) { |
676 | if (!context->rlimit[i]) | |
677 | continue; | |
678 | ||
679 | if (setrlimit(i, context->rlimit[i]) < 0) { | |
680 | r = EXIT_LIMITS; | |
681 | goto fail; | |
682 | } | |
034c6ed7 | 683 | } |
034c6ed7 | 684 | |
81a2b7ce LP |
685 | if (context->user) |
686 | if (enforce_user(context, uid) < 0) { | |
687 | r = EXIT_USER; | |
688 | goto fail; | |
689 | } | |
690 | ||
693ced48 LP |
691 | /* PR_GET_SECUREBITS is not priviliged, while |
692 | * PR_SET_SECUREBITS is. So to suppress | |
693 | * potential EPERMs we'll try not to call | |
694 | * PR_SET_SECUREBITS unless necessary. */ | |
695 | if (prctl(PR_GET_SECUREBITS) != context->secure_bits) | |
696 | if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) { | |
697 | r = EXIT_SECUREBITS; | |
698 | goto fail; | |
699 | } | |
81a2b7ce LP |
700 | |
701 | if (context->capabilities) | |
702 | if (cap_set_proc(context->capabilities) < 0) { | |
703 | r = EXIT_CAPABILITIES; | |
704 | goto fail; | |
705 | } | |
94f04347 LP |
706 | } |
707 | ||
81a2b7ce LP |
708 | if (!(our_env = new0(char*, 6))) { |
709 | r = EXIT_MEMORY; | |
710 | goto fail; | |
711 | } | |
034c6ed7 | 712 | |
81a2b7ce LP |
713 | if (n_fds > 0) |
714 | if (asprintf(our_env + n_env++, "LISTEN_PID=%llu", (unsigned long long) getpid()) < 0 || | |
715 | asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0) { | |
716 | r = EXIT_MEMORY; | |
717 | goto fail; | |
718 | } | |
034c6ed7 | 719 | |
81a2b7ce LP |
720 | if (home) |
721 | if (asprintf(our_env + n_env++, "HOME=%s", home) < 0) { | |
722 | r = EXIT_MEMORY; | |
723 | goto fail; | |
724 | } | |
034c6ed7 | 725 | |
81a2b7ce LP |
726 | if (username) |
727 | if (asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 || | |
728 | asprintf(our_env + n_env++, "USER=%s", username) < 0) { | |
729 | r = EXIT_MEMORY; | |
730 | goto fail; | |
731 | } | |
034c6ed7 | 732 | |
81a2b7ce LP |
733 | if (!(final_env = strv_env_merge(environ, our_env, context->environment, NULL))) { |
734 | r = EXIT_MEMORY; | |
735 | goto fail; | |
736 | } | |
034c6ed7 | 737 | |
81a2b7ce | 738 | execve(command->path, command->argv, final_env); |
034c6ed7 LP |
739 | r = EXIT_EXEC; |
740 | ||
741 | fail: | |
81a2b7ce LP |
742 | strv_free(our_env); |
743 | strv_free(final_env); | |
744 | ||
034c6ed7 LP |
745 | _exit(r); |
746 | } | |
747 | ||
2da3263a | 748 | |
81a2b7ce | 749 | log_debug("Forked %s as %llu", command->path, (unsigned long long) pid); |
2da3263a | 750 | |
034c6ed7 | 751 | *ret = pid; |
5cb5a6ff LP |
752 | return 0; |
753 | } | |
754 | ||
034c6ed7 LP |
755 | void exec_context_init(ExecContext *c) { |
756 | assert(c); | |
757 | ||
758 | c->umask = 0002; | |
034c6ed7 | 759 | c->oom_adjust = 0; |
9eba9da4 | 760 | c->oom_adjust_set = false; |
034c6ed7 | 761 | c->nice = 0; |
9eba9da4 LP |
762 | c->nice_set = false; |
763 | c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0); | |
764 | c->ioprio_set = false; | |
94f04347 LP |
765 | c->cpu_sched_policy = SCHED_OTHER; |
766 | c->cpu_sched_priority = 0; | |
767 | c->cpu_sched_set = false; | |
768 | CPU_ZERO(&c->cpu_affinity); | |
769 | c->cpu_affinity_set = false; | |
071830ff | 770 | |
94f04347 | 771 | c->input = 0; |
071830ff LP |
772 | c->output = 0; |
773 | c->syslog_priority = LOG_DAEMON|LOG_INFO; | |
94f04347 LP |
774 | |
775 | c->secure_bits = 0; | |
776 | c->capability_bounding_set_drop = 0; | |
034c6ed7 LP |
777 | } |
778 | ||
779 | void exec_context_done(ExecContext *c) { | |
5cb5a6ff LP |
780 | unsigned l; |
781 | ||
782 | assert(c); | |
783 | ||
784 | strv_free(c->environment); | |
034c6ed7 | 785 | c->environment = NULL; |
5cb5a6ff | 786 | |
034c6ed7 | 787 | for (l = 0; l < ELEMENTSOF(c->rlimit); l++) { |
5cb5a6ff | 788 | free(c->rlimit[l]); |
034c6ed7 LP |
789 | c->rlimit[l] = NULL; |
790 | } | |
791 | ||
9eba9da4 LP |
792 | free(c->working_directory); |
793 | c->working_directory = NULL; | |
794 | free(c->root_directory); | |
795 | c->root_directory = NULL; | |
5cb5a6ff | 796 | |
071830ff LP |
797 | free(c->syslog_identifier); |
798 | c->syslog_identifier = NULL; | |
799 | ||
5cb5a6ff | 800 | free(c->user); |
034c6ed7 LP |
801 | c->user = NULL; |
802 | ||
5cb5a6ff | 803 | free(c->group); |
034c6ed7 LP |
804 | c->group = NULL; |
805 | ||
806 | strv_free(c->supplementary_groups); | |
807 | c->supplementary_groups = NULL; | |
94f04347 LP |
808 | |
809 | if (c->capabilities) { | |
810 | cap_free(c->capabilities); | |
811 | c->capabilities = NULL; | |
812 | } | |
5cb5a6ff LP |
813 | } |
814 | ||
815 | void exec_command_free_list(ExecCommand *c) { | |
816 | ExecCommand *i; | |
817 | ||
818 | while ((i = c)) { | |
034c6ed7 | 819 | LIST_REMOVE(ExecCommand, command, c, i); |
5cb5a6ff LP |
820 | |
821 | free(i->path); | |
44d8db9e | 822 | strv_free(i->argv); |
5cb5a6ff LP |
823 | free(i); |
824 | } | |
825 | } | |
826 | ||
034c6ed7 LP |
827 | void exec_command_free_array(ExecCommand **c, unsigned n) { |
828 | unsigned i; | |
829 | ||
830 | for (i = 0; i < n; i++) { | |
831 | exec_command_free_list(c[i]); | |
832 | c[i] = NULL; | |
833 | } | |
834 | } | |
835 | ||
5cb5a6ff | 836 | void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { |
94f04347 LP |
837 | char ** e; |
838 | unsigned i; | |
9eba9da4 | 839 | |
5cb5a6ff LP |
840 | assert(c); |
841 | assert(f); | |
842 | ||
843 | if (!prefix) | |
844 | prefix = ""; | |
845 | ||
846 | fprintf(f, | |
94f04347 LP |
847 | "%sUMask: %04o\n" |
848 | "%sWorkingDirectory: %s\n" | |
451a074f LP |
849 | "%sRootDirectory: %s\n" |
850 | "%sNonBlocking: %s\n", | |
5cb5a6ff | 851 | prefix, c->umask, |
9eba9da4 | 852 | prefix, c->working_directory ? c->working_directory : "/", |
451a074f LP |
853 | prefix, c->root_directory ? c->root_directory : "/", |
854 | prefix, yes_no(c->non_blocking)); | |
fb33a393 | 855 | |
94f04347 LP |
856 | if (c->environment) |
857 | for (e = c->environment; *e; e++) | |
858 | fprintf(f, "%sEnvironment: %s\n", prefix, *e); | |
859 | ||
fb33a393 LP |
860 | if (c->nice_set) |
861 | fprintf(f, | |
862 | "%sNice: %i\n", | |
863 | prefix, c->nice); | |
864 | ||
865 | if (c->oom_adjust_set) | |
866 | fprintf(f, | |
867 | "%sOOMAdjust: %i\n", | |
868 | prefix, c->oom_adjust); | |
9eba9da4 | 869 | |
94f04347 LP |
870 | for (i = 0; i < RLIM_NLIMITS; i++) |
871 | if (c->rlimit[i]) | |
ea430986 | 872 | fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max); |
94f04347 | 873 | |
9eba9da4 LP |
874 | if (c->ioprio_set) |
875 | fprintf(f, | |
876 | "%sIOSchedulingClass: %s\n" | |
877 | "%sIOPriority: %i\n", | |
94f04347 | 878 | prefix, ioprio_class_to_string(IOPRIO_PRIO_CLASS(c->ioprio)), |
9eba9da4 | 879 | prefix, (int) IOPRIO_PRIO_DATA(c->ioprio)); |
94f04347 LP |
880 | |
881 | if (c->cpu_sched_set) | |
882 | fprintf(f, | |
883 | "%sCPUSchedulingPolicy: %s\n" | |
38b48754 LP |
884 | "%sCPUSchedulingPriority: %i\n" |
885 | "%sCPUSchedulingResetOnFork: %s\n", | |
94f04347 | 886 | prefix, sched_policy_to_string(c->cpu_sched_policy), |
38b48754 LP |
887 | prefix, c->cpu_sched_priority, |
888 | prefix, yes_no(c->cpu_sched_reset_on_fork)); | |
94f04347 LP |
889 | |
890 | if (c->cpu_affinity_set) { | |
891 | fprintf(f, "%sCPUAffinity:", prefix); | |
892 | for (i = 0; i < CPU_SETSIZE; i++) | |
893 | if (CPU_ISSET(i, &c->cpu_affinity)) | |
894 | fprintf(f, " %i", i); | |
895 | fputs("\n", f); | |
896 | } | |
897 | ||
898 | if (c->timer_slack_ns_set) | |
899 | fprintf(f, "%sTimerSlackNS: %lu\n", prefix, c->timer_slack_ns); | |
900 | ||
901 | fprintf(f, | |
902 | "%sInput: %s\n" | |
903 | "%sOutput: %s\n", | |
904 | prefix, exec_input_to_string(c->input), | |
905 | prefix, exec_output_to_string(c->output)); | |
906 | ||
907 | if (c->output == EXEC_OUTPUT_SYSLOG || c->output == EXEC_OUTPUT_KERNEL) | |
908 | fprintf(f, | |
909 | "%sSyslogFacility: %s\n" | |
910 | "%sSyslogLevel: %s\n", | |
911 | prefix, log_facility_to_string(LOG_FAC(c->syslog_priority)), | |
912 | prefix, log_level_to_string(LOG_PRI(c->syslog_priority))); | |
913 | ||
914 | if (c->capabilities) { | |
915 | char *t; | |
916 | if ((t = cap_to_text(c->capabilities, NULL))) { | |
917 | fprintf(f, "%sCapabilities: %s\n", | |
918 | prefix, t); | |
919 | cap_free(t); | |
920 | } | |
921 | } | |
922 | ||
923 | if (c->secure_bits) | |
924 | fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n", | |
925 | prefix, | |
926 | (c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "", | |
927 | (c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "", | |
928 | (c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "", | |
929 | (c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "", | |
930 | (c->secure_bits & SECURE_NOROOT) ? " noroot" : "", | |
931 | (c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : ""); | |
932 | ||
933 | if (c->capability_bounding_set_drop) { | |
934 | fprintf(f, "%sCapabilityBoundingSetDrop:", prefix); | |
935 | ||
936 | for (i = 0; i <= CAP_LAST_CAP; i++) | |
937 | if (c->capability_bounding_set_drop & (1 << i)) { | |
938 | char *t; | |
939 | ||
940 | if ((t = cap_to_name(i))) { | |
941 | fprintf(f, " %s", t); | |
942 | free(t); | |
943 | } | |
944 | } | |
945 | ||
946 | fputs("\n", f); | |
947 | } | |
948 | ||
949 | if (c->user) | |
950 | fprintf(f, "%sUser: %s", prefix, c->user); | |
951 | if (c->group) | |
952 | fprintf(f, "%sGroup: %s", prefix, c->group); | |
953 | ||
954 | if (c->supplementary_groups) { | |
955 | char **g; | |
956 | ||
957 | fprintf(f, "%sSupplementaryGroups:", prefix); | |
958 | ||
959 | STRV_FOREACH(g, c->supplementary_groups) | |
960 | fprintf(f, " %s", *g); | |
961 | ||
962 | fputs("\n", f); | |
963 | } | |
5cb5a6ff LP |
964 | } |
965 | ||
034c6ed7 LP |
966 | void exec_status_fill(ExecStatus *s, pid_t pid, int code, int status) { |
967 | assert(s); | |
5cb5a6ff | 968 | |
034c6ed7 LP |
969 | s->pid = pid; |
970 | s->code = code; | |
971 | s->status = status; | |
972 | s->timestamp = now(CLOCK_REALTIME); | |
5cb5a6ff | 973 | } |
44d8db9e LP |
974 | |
975 | char *exec_command_line(ExecCommand *c) { | |
976 | size_t k; | |
977 | char *n, *p, **a; | |
978 | bool first = true; | |
979 | ||
980 | assert(c); | |
981 | assert(c->argv); | |
982 | ||
9164977d | 983 | k = 1; |
44d8db9e LP |
984 | STRV_FOREACH(a, c->argv) |
985 | k += strlen(*a)+3; | |
986 | ||
987 | if (!(n = new(char, k))) | |
988 | return NULL; | |
989 | ||
990 | p = n; | |
991 | STRV_FOREACH(a, c->argv) { | |
992 | ||
993 | if (!first) | |
994 | *(p++) = ' '; | |
995 | else | |
996 | first = false; | |
997 | ||
998 | if (strpbrk(*a, WHITESPACE)) { | |
999 | *(p++) = '\''; | |
1000 | p = stpcpy(p, *a); | |
1001 | *(p++) = '\''; | |
1002 | } else | |
1003 | p = stpcpy(p, *a); | |
1004 | ||
1005 | } | |
1006 | ||
9164977d LP |
1007 | *p = 0; |
1008 | ||
44d8db9e LP |
1009 | /* FIXME: this doesn't really handle arguments that have |
1010 | * spaces and ticks in them */ | |
1011 | ||
1012 | return n; | |
1013 | } | |
1014 | ||
1015 | void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) { | |
1016 | char *cmd; | |
1017 | ||
1018 | assert(c); | |
1019 | assert(f); | |
1020 | ||
1021 | if (!prefix) | |
1022 | prefix = ""; | |
1023 | ||
1024 | cmd = exec_command_line(c); | |
1025 | ||
1026 | fprintf(f, | |
1027 | "%sCommand Line: %s\n", | |
1028 | prefix, cmd ? cmd : strerror(ENOMEM)); | |
1029 | ||
1030 | free(cmd); | |
1031 | } | |
1032 | ||
1033 | void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) { | |
1034 | assert(f); | |
1035 | ||
1036 | if (!prefix) | |
1037 | prefix = ""; | |
1038 | ||
1039 | LIST_FOREACH(command, c, c) | |
1040 | exec_command_dump(c, f, prefix); | |
1041 | } | |
94f04347 | 1042 | |
a6a80b4f LP |
1043 | void exec_command_append_list(ExecCommand **l, ExecCommand *e) { |
1044 | ExecCommand *end; | |
1045 | ||
1046 | assert(l); | |
1047 | assert(e); | |
1048 | ||
1049 | if (*l) { | |
1050 | /* It's kinda important that we keep the order here */ | |
1051 | LIST_FIND_TAIL(ExecCommand, command, *l, end); | |
1052 | LIST_INSERT_AFTER(ExecCommand, command, *l, end, e); | |
1053 | } else | |
1054 | *l = e; | |
1055 | } | |
1056 | ||
94f04347 LP |
1057 | static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = { |
1058 | [EXEC_OUTPUT_CONSOLE] = "console", | |
1059 | [EXEC_OUTPUT_NULL] = "null", | |
1060 | [EXEC_OUTPUT_SYSLOG] = "syslog", | |
1061 | [EXEC_OUTPUT_KERNEL] = "kernel" | |
1062 | }; | |
1063 | ||
1064 | DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput); | |
1065 | ||
1066 | static const char* const exec_input_table[_EXEC_INPUT_MAX] = { | |
1067 | [EXEC_INPUT_NULL] = "null", | |
1068 | [EXEC_INPUT_CONSOLE] = "console" | |
1069 | }; | |
1070 | ||
1071 | DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput); |