]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/core/execute.c
projects / thirdparty / systemd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
execute: downgrade namespace error to "warning"
[thirdparty/systemd.git] / src / core / execute.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
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 Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
17
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 ***/
21
22 #include <assert.h>
23 #include <dirent.h>
24 #include <errno.h>
25 #include <fcntl.h>
26 #include <unistd.h>
27 #include <string.h>
28 #include <signal.h>
29 #include <sys/socket.h>
30 #include <sys/un.h>
31 #include <sys/prctl.h>
32 #include <linux/sched.h>
33 #include <sys/types.h>
34 #include <sys/stat.h>
35 #include <grp.h>
36 #include <pwd.h>
37 #include <sys/mount.h>
38 #include <linux/fs.h>
39 #include <linux/oom.h>
40 #include <sys/poll.h>
41 #include <glob.h>
42 #include <sys/personality.h>
43 #include <libgen.h>
44 #undef basename
45
46 #ifdef HAVE_PAM
47 #include <security/pam_appl.h>
48 #endif
49
50 #ifdef HAVE_SELINUX
51 #include <selinux/selinux.h>
52 #endif
53
54 #ifdef HAVE_SECCOMP
55 #include <seccomp.h>
56 #endif
57
58 #ifdef HAVE_APPARMOR
59 #include <sys/apparmor.h>
60 #endif
61
62 #include "execute.h"
63 #include "strv.h"
64 #include "macro.h"
65 #include "capability.h"
66 #include "util.h"
67 #include "log.h"
68 #include "sd-messages.h"
69 #include "ioprio.h"
70 #include "securebits.h"
71 #include "namespace.h"
72 #include "exit-status.h"
73 #include "missing.h"
74 #include "utmp-wtmp.h"
75 #include "def.h"
76 #include "path-util.h"
77 #include "env-util.h"
78 #include "fileio.h"
79 #include "unit.h"
80 #include "async.h"
81 #include "selinux-util.h"
82 #include "errno-list.h"
83 #include "af-list.h"
84 #include "mkdir.h"
85 #include "apparmor-util.h"
86 #include "bus-kernel.h"
87 #include "label.h"
88
89 #ifdef HAVE_SECCOMP
90 #include "seccomp-util.h"
91 #endif
92
93 #define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC)
94 #define IDLE_TIMEOUT2_USEC (1*USEC_PER_SEC)
95
96 /* This assumes there is a 'tty' group */
97 #define TTY_MODE 0620
98
99 #define SNDBUF_SIZE (8*1024*1024)
100
101 static int shift_fds(int fds[], unsigned n_fds) {
102 int start, restart_from;
103
104 if (n_fds <= 0)
105 return 0;
106
107 /* Modifies the fds array! (sorts it) */
108
109 assert(fds);
110
111 start = 0;
112 for (;;) {
113 int i;
114
115 restart_from = -1;
116
117 for (i = start; i < (int) n_fds; i++) {
118 int nfd;
119
120 /* Already at right index? */
121 if (fds[i] == i+3)
122 continue;
123
124 if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
125 return -errno;
126
127 safe_close(fds[i]);
128 fds[i] = nfd;
129
130 /* Hmm, the fd we wanted isn't free? Then
131 * let's remember that and try again from here*/
132 if (nfd != i+3 && restart_from < 0)
133 restart_from = i;
134 }
135
136 if (restart_from < 0)
137 break;
138
139 start = restart_from;
140 }
141
142 return 0;
143 }
144
145 static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) {
146 unsigned i;
147 int r;
148
149 if (n_fds <= 0)
150 return 0;
151
152 assert(fds);
153
154 /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
155
156 for (i = 0; i < n_fds; i++) {
157
158 if ((r = fd_nonblock(fds[i], nonblock)) < 0)
159 return r;
160
161 /* We unconditionally drop FD_CLOEXEC from the fds,
162 * since after all we want to pass these fds to our
163 * children */
164
165 if ((r = fd_cloexec(fds[i], false)) < 0)
166 return r;
167 }
168
169 return 0;
170 }
171
172 _pure_ static const char *tty_path(const ExecContext *context) {
173 assert(context);
174
175 if (context->tty_path)
176 return context->tty_path;
177
178 return "/dev/console";
179 }
180
181 static void exec_context_tty_reset(const ExecContext *context) {
182 assert(context);
183
184 if (context->tty_vhangup)
185 terminal_vhangup(tty_path(context));
186
187 if (context->tty_reset)
188 reset_terminal(tty_path(context));
189
190 if (context->tty_vt_disallocate && context->tty_path)
191 vt_disallocate(context->tty_path);
192 }
193
194 static bool is_terminal_output(ExecOutput o) {
195 return
196 o == EXEC_OUTPUT_TTY ||
197 o == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
198 o == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
199 o == EXEC_OUTPUT_JOURNAL_AND_CONSOLE;
200 }
201
202 static int open_null_as(int flags, int nfd) {
203 int fd, r;
204
205 assert(nfd >= 0);
206
207 fd = open("/dev/null", flags|O_NOCTTY);
208 if (fd < 0)
209 return -errno;
210
211 if (fd != nfd) {
212 r = dup2(fd, nfd) < 0 ? -errno : nfd;
213 safe_close(fd);
214 } else
215 r = nfd;
216
217 return r;
218 }
219
220 static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, const char *unit_id, int nfd) {
221 int fd, r;
222 union sockaddr_union sa = {
223 .un.sun_family = AF_UNIX,
224 .un.sun_path = "/run/systemd/journal/stdout",
225 };
226
227 assert(context);
228 assert(output < _EXEC_OUTPUT_MAX);
229 assert(ident);
230 assert(nfd >= 0);
231
232 fd = socket(AF_UNIX, SOCK_STREAM, 0);
233 if (fd < 0)
234 return -errno;
235
236 r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
237 if (r < 0) {
238 safe_close(fd);
239 return -errno;
240 }
241
242 if (shutdown(fd, SHUT_RD) < 0) {
243 safe_close(fd);
244 return -errno;
245 }
246
247 fd_inc_sndbuf(fd, SNDBUF_SIZE);
248
249 dprintf(fd,
250 "%s\n"
251 "%s\n"
252 "%i\n"
253 "%i\n"
254 "%i\n"
255 "%i\n"
256 "%i\n",
257 context->syslog_identifier ? context->syslog_identifier : ident,
258 unit_id,
259 context->syslog_priority,
260 !!context->syslog_level_prefix,
261 output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE,
262 output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE,
263 is_terminal_output(output));
264
265 if (fd != nfd) {
266 r = dup2(fd, nfd) < 0 ? -errno : nfd;
267 safe_close(fd);
268 } else
269 r = nfd;
270
271 return r;
272 }
273 static int open_terminal_as(const char *path, mode_t mode, int nfd) {
274 int fd, r;
275
276 assert(path);
277 assert(nfd >= 0);
278
279 if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
280 return fd;
281
282 if (fd != nfd) {
283 r = dup2(fd, nfd) < 0 ? -errno : nfd;
284 safe_close(fd);
285 } else
286 r = nfd;
287
288 return r;
289 }
290
291 static bool is_terminal_input(ExecInput i) {
292 return
293 i == EXEC_INPUT_TTY ||
294 i == EXEC_INPUT_TTY_FORCE ||
295 i == EXEC_INPUT_TTY_FAIL;
296 }
297
298 static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) {
299
300 if (is_terminal_input(std_input) && !apply_tty_stdin)
301 return EXEC_INPUT_NULL;
302
303 if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
304 return EXEC_INPUT_NULL;
305
306 return std_input;
307 }
308
309 static int fixup_output(ExecOutput std_output, int socket_fd) {
310
311 if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
312 return EXEC_OUTPUT_INHERIT;
313
314 return std_output;
315 }
316
317 static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) {
318 ExecInput i;
319
320 assert(context);
321
322 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
323
324 switch (i) {
325
326 case EXEC_INPUT_NULL:
327 return open_null_as(O_RDONLY, STDIN_FILENO);
328
329 case EXEC_INPUT_TTY:
330 case EXEC_INPUT_TTY_FORCE:
331 case EXEC_INPUT_TTY_FAIL: {
332 int fd, r;
333
334 fd = acquire_terminal(tty_path(context),
335 i == EXEC_INPUT_TTY_FAIL,
336 i == EXEC_INPUT_TTY_FORCE,
337 false,
338 USEC_INFINITY);
339 if (fd < 0)
340 return fd;
341
342 if (fd != STDIN_FILENO) {
343 r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
344 safe_close(fd);
345 } else
346 r = STDIN_FILENO;
347
348 return r;
349 }
350
351 case EXEC_INPUT_SOCKET:
352 return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
353
354 default:
355 assert_not_reached("Unknown input type");
356 }
357 }
358
359 static int setup_output(const ExecContext *context, int fileno, int socket_fd, const char *ident, const char *unit_id, bool apply_tty_stdin) {
360 ExecOutput o;
361 ExecInput i;
362 int r;
363
364 assert(context);
365 assert(ident);
366
367 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
368 o = fixup_output(context->std_output, socket_fd);
369
370 if (fileno == STDERR_FILENO) {
371 ExecOutput e;
372 e = fixup_output(context->std_error, socket_fd);
373
374 /* This expects the input and output are already set up */
375
376 /* Don't change the stderr file descriptor if we inherit all
377 * the way and are not on a tty */
378 if (e == EXEC_OUTPUT_INHERIT &&
379 o == EXEC_OUTPUT_INHERIT &&
380 i == EXEC_INPUT_NULL &&
381 !is_terminal_input(context->std_input) &&
382 getppid () != 1)
383 return fileno;
384
385 /* Duplicate from stdout if possible */
386 if (e == o || e == EXEC_OUTPUT_INHERIT)
387 return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno;
388
389 o = e;
390
391 } else if (o == EXEC_OUTPUT_INHERIT) {
392 /* If input got downgraded, inherit the original value */
393 if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input))
394 return open_terminal_as(tty_path(context), O_WRONLY, fileno);
395
396 /* If the input is connected to anything that's not a /dev/null, inherit that... */
397 if (i != EXEC_INPUT_NULL)
398 return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
399
400 /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */
401 if (getppid() != 1)
402 return fileno;
403
404 /* We need to open /dev/null here anew, to get the right access mode. */
405 return open_null_as(O_WRONLY, fileno);
406 }
407
408 switch (o) {
409
410 case EXEC_OUTPUT_NULL:
411 return open_null_as(O_WRONLY, fileno);
412
413 case EXEC_OUTPUT_TTY:
414 if (is_terminal_input(i))
415 return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
416
417 /* We don't reset the terminal if this is just about output */
418 return open_terminal_as(tty_path(context), O_WRONLY, fileno);
419
420 case EXEC_OUTPUT_SYSLOG:
421 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
422 case EXEC_OUTPUT_KMSG:
423 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
424 case EXEC_OUTPUT_JOURNAL:
425 case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
426 r = connect_logger_as(context, o, ident, unit_id, fileno);
427 if (r < 0) {
428 log_struct_unit(LOG_CRIT, unit_id,
429 "MESSAGE=Failed to connect std%s of %s to the journal socket: %s",
430 fileno == STDOUT_FILENO ? "out" : "err",
431 unit_id, strerror(-r),
432 "ERRNO=%d", -r,
433 NULL);
434 r = open_null_as(O_WRONLY, fileno);
435 }
436 return r;
437
438 case EXEC_OUTPUT_SOCKET:
439 assert(socket_fd >= 0);
440 return dup2(socket_fd, fileno) < 0 ? -errno : fileno;
441
442 default:
443 assert_not_reached("Unknown error type");
444 }
445 }
446
447 static int chown_terminal(int fd, uid_t uid) {
448 struct stat st;
449
450 assert(fd >= 0);
451
452 /* This might fail. What matters are the results. */
453 (void) fchown(fd, uid, -1);
454 (void) fchmod(fd, TTY_MODE);
455
456 if (fstat(fd, &st) < 0)
457 return -errno;
458
459 if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
460 return -EPERM;
461
462 return 0;
463 }
464
465 static int setup_confirm_stdio(int *_saved_stdin,
466 int *_saved_stdout) {
467 int fd = -1, saved_stdin, saved_stdout = -1, r;
468
469 assert(_saved_stdin);
470 assert(_saved_stdout);
471
472 saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3);
473 if (saved_stdin < 0)
474 return -errno;
475
476 saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3);
477 if (saved_stdout < 0) {
478 r = errno;
479 goto fail;
480 }
481
482 fd = acquire_terminal(
483 "/dev/console",
484 false,
485 false,
486 false,
487 DEFAULT_CONFIRM_USEC);
488 if (fd < 0) {
489 r = fd;
490 goto fail;
491 }
492
493 r = chown_terminal(fd, getuid());
494 if (r < 0)
495 goto fail;
496
497 if (dup2(fd, STDIN_FILENO) < 0) {
498 r = -errno;
499 goto fail;
500 }
501
502 if (dup2(fd, STDOUT_FILENO) < 0) {
503 r = -errno;
504 goto fail;
505 }
506
507 if (fd >= 2)
508 safe_close(fd);
509
510 *_saved_stdin = saved_stdin;
511 *_saved_stdout = saved_stdout;
512
513 return 0;
514
515 fail:
516 safe_close(saved_stdout);
517 safe_close(saved_stdin);
518 safe_close(fd);
519
520 return r;
521 }
522
523 _printf_(1, 2) static int write_confirm_message(const char *format, ...) {
524 _cleanup_close_ int fd = -1;
525 va_list ap;
526
527 assert(format);
528
529 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
530 if (fd < 0)
531 return fd;
532
533 va_start(ap, format);
534 vdprintf(fd, format, ap);
535 va_end(ap);
536
537 return 0;
538 }
539
540 static int restore_confirm_stdio(int *saved_stdin,
541 int *saved_stdout) {
542
543 int r = 0;
544
545 assert(saved_stdin);
546 assert(saved_stdout);
547
548 release_terminal();
549
550 if (*saved_stdin >= 0)
551 if (dup2(*saved_stdin, STDIN_FILENO) < 0)
552 r = -errno;
553
554 if (*saved_stdout >= 0)
555 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
556 r = -errno;
557
558 safe_close(*saved_stdin);
559 safe_close(*saved_stdout);
560
561 return r;
562 }
563
564 static int ask_for_confirmation(char *response, char **argv) {
565 int saved_stdout = -1, saved_stdin = -1, r;
566 _cleanup_free_ char *line = NULL;
567
568 r = setup_confirm_stdio(&saved_stdin, &saved_stdout);
569 if (r < 0)
570 return r;
571
572 line = exec_command_line(argv);
573 if (!line)
574 return -ENOMEM;
575
576 r = ask_char(response, "yns", "Execute %s? [Yes, No, Skip] ", line);
577
578 restore_confirm_stdio(&saved_stdin, &saved_stdout);
579
580 return r;
581 }
582
583 static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
584 bool keep_groups = false;
585 int r;
586
587 assert(context);
588
589 /* Lookup and set GID and supplementary group list. Here too
590 * we avoid NSS lookups for gid=0. */
591
592 if (context->group || username) {
593
594 if (context->group) {
595 const char *g = context->group;
596
597 if ((r = get_group_creds(&g, &gid)) < 0)
598 return r;
599 }
600
601 /* First step, initialize groups from /etc/groups */
602 if (username && gid != 0) {
603 if (initgroups(username, gid) < 0)
604 return -errno;
605
606 keep_groups = true;
607 }
608
609 /* Second step, set our gids */
610 if (setresgid(gid, gid, gid) < 0)
611 return -errno;
612 }
613
614 if (context->supplementary_groups) {
615 int ngroups_max, k;
616 gid_t *gids;
617 char **i;
618
619 /* Final step, initialize any manually set supplementary groups */
620 assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0);
621
622 if (!(gids = new(gid_t, ngroups_max)))
623 return -ENOMEM;
624
625 if (keep_groups) {
626 if ((k = getgroups(ngroups_max, gids)) < 0) {
627 free(gids);
628 return -errno;
629 }
630 } else
631 k = 0;
632
633 STRV_FOREACH(i, context->supplementary_groups) {
634 const char *g;
635
636 if (k >= ngroups_max) {
637 free(gids);
638 return -E2BIG;
639 }
640
641 g = *i;
642 r = get_group_creds(&g, gids+k);
643 if (r < 0) {
644 free(gids);
645 return r;
646 }
647
648 k++;
649 }
650
651 if (setgroups(k, gids) < 0) {
652 free(gids);
653 return -errno;
654 }
655
656 free(gids);
657 }
658
659 return 0;
660 }
661
662 static int enforce_user(const ExecContext *context, uid_t uid) {
663 assert(context);
664
665 /* Sets (but doesn't lookup) the uid and make sure we keep the
666 * capabilities while doing so. */
667
668 if (context->capabilities) {
669 _cleanup_cap_free_ cap_t d = NULL;
670 static const cap_value_t bits[] = {
671 CAP_SETUID, /* Necessary so that we can run setresuid() below */
672 CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */
673 };
674
675 /* First step: If we need to keep capabilities but
676 * drop privileges we need to make sure we keep our
677 * caps, while we drop privileges. */
678 if (uid != 0) {
679 int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS;
680
681 if (prctl(PR_GET_SECUREBITS) != sb)
682 if (prctl(PR_SET_SECUREBITS, sb) < 0)
683 return -errno;
684 }
685
686 /* Second step: set the capabilities. This will reduce
687 * the capabilities to the minimum we need. */
688
689 d = cap_dup(context->capabilities);
690 if (!d)
691 return -errno;
692
693 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
694 cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0)
695 return -errno;
696
697 if (cap_set_proc(d) < 0)
698 return -errno;
699 }
700
701 /* Third step: actually set the uids */
702 if (setresuid(uid, uid, uid) < 0)
703 return -errno;
704
705 /* At this point we should have all necessary capabilities but
706 are otherwise a normal user. However, the caps might got
707 corrupted due to the setresuid() so we need clean them up
708 later. This is done outside of this call. */
709
710 return 0;
711 }
712
713 #ifdef HAVE_PAM
714
715 static int null_conv(
716 int num_msg,
717 const struct pam_message **msg,
718 struct pam_response **resp,
719 void *appdata_ptr) {
720
721 /* We don't support conversations */
722
723 return PAM_CONV_ERR;
724 }
725
726 static int setup_pam(
727 const char *name,
728 const char *user,
729 uid_t uid,
730 const char *tty,
731 char ***pam_env,
732 int fds[], unsigned n_fds) {
733
734 static const struct pam_conv conv = {
735 .conv = null_conv,
736 .appdata_ptr = NULL
737 };
738
739 pam_handle_t *handle = NULL;
740 sigset_t ss, old_ss;
741 int pam_code = PAM_SUCCESS;
742 int err;
743 char **e = NULL;
744 bool close_session = false;
745 pid_t pam_pid = 0, parent_pid;
746 int flags = 0;
747
748 assert(name);
749 assert(user);
750 assert(pam_env);
751
752 /* We set up PAM in the parent process, then fork. The child
753 * will then stay around until killed via PR_GET_PDEATHSIG or
754 * systemd via the cgroup logic. It will then remove the PAM
755 * session again. The parent process will exec() the actual
756 * daemon. We do things this way to ensure that the main PID
757 * of the daemon is the one we initially fork()ed. */
758
759 if (log_get_max_level() < LOG_PRI(LOG_DEBUG))
760 flags |= PAM_SILENT;
761
762 pam_code = pam_start(name, user, &conv, &handle);
763 if (pam_code != PAM_SUCCESS) {
764 handle = NULL;
765 goto fail;
766 }
767
768 if (tty) {
769 pam_code = pam_set_item(handle, PAM_TTY, tty);
770 if (pam_code != PAM_SUCCESS)
771 goto fail;
772 }
773
774 pam_code = pam_acct_mgmt(handle, flags);
775 if (pam_code != PAM_SUCCESS)
776 goto fail;
777
778 pam_code = pam_open_session(handle, flags);
779 if (pam_code != PAM_SUCCESS)
780 goto fail;
781
782 close_session = true;
783
784 e = pam_getenvlist(handle);
785 if (!e) {
786 pam_code = PAM_BUF_ERR;
787 goto fail;
788 }
789
790 /* Block SIGTERM, so that we know that it won't get lost in
791 * the child */
792 if (sigemptyset(&ss) < 0 ||
793 sigaddset(&ss, SIGTERM) < 0 ||
794 sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0)
795 goto fail;
796
797 parent_pid = getpid();
798
799 pam_pid = fork();
800 if (pam_pid < 0)
801 goto fail;
802
803 if (pam_pid == 0) {
804 int sig;
805 int r = EXIT_PAM;
806
807 /* The child's job is to reset the PAM session on
808 * termination */
809
810 /* This string must fit in 10 chars (i.e. the length
811 * of "/sbin/init"), to look pretty in /bin/ps */
812 rename_process("(sd-pam)");
813
814 /* Make sure we don't keep open the passed fds in this
815 child. We assume that otherwise only those fds are
816 open here that have been opened by PAM. */
817 close_many(fds, n_fds);
818
819 /* Drop privileges - we don't need any to pam_close_session
820 * and this will make PR_SET_PDEATHSIG work in most cases.
821 * If this fails, ignore the error - but expect sd-pam threads
822 * to fail to exit normally */
823 if (setresuid(uid, uid, uid) < 0)
824 log_error("Error: Failed to setresuid() in sd-pam: %s", strerror(-r));
825
826 /* Wait until our parent died. This will only work if
827 * the above setresuid() succeeds, otherwise the kernel
828 * will not allow unprivileged parents kill their privileged
829 * children this way. We rely on the control groups kill logic
830 * to do the rest for us. */
831 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
832 goto child_finish;
833
834 /* Check if our parent process might already have
835 * died? */
836 if (getppid() == parent_pid) {
837 for (;;) {
838 if (sigwait(&ss, &sig) < 0) {
839 if (errno == EINTR)
840 continue;
841
842 goto child_finish;
843 }
844
845 assert(sig == SIGTERM);
846 break;
847 }
848 }
849
850 /* If our parent died we'll end the session */
851 if (getppid() != parent_pid) {
852 pam_code = pam_close_session(handle, flags);
853 if (pam_code != PAM_SUCCESS)
854 goto child_finish;
855 }
856
857 r = 0;
858
859 child_finish:
860 pam_end(handle, pam_code | flags);
861 _exit(r);
862 }
863
864 /* If the child was forked off successfully it will do all the
865 * cleanups, so forget about the handle here. */
866 handle = NULL;
867
868 /* Unblock SIGTERM again in the parent */
869 if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0)
870 goto fail;
871
872 /* We close the log explicitly here, since the PAM modules
873 * might have opened it, but we don't want this fd around. */
874 closelog();
875
876 *pam_env = e;
877 e = NULL;
878
879 return 0;
880
881 fail:
882 if (pam_code != PAM_SUCCESS) {
883 log_error("PAM failed: %s", pam_strerror(handle, pam_code));
884 err = -EPERM; /* PAM errors do not map to errno */
885 } else {
886 log_error("PAM failed: %m");
887 err = -errno;
888 }
889
890 if (handle) {
891 if (close_session)
892 pam_code = pam_close_session(handle, flags);
893
894 pam_end(handle, pam_code | flags);
895 }
896
897 strv_free(e);
898
899 closelog();
900
901 if (pam_pid > 1) {
902 kill(pam_pid, SIGTERM);
903 kill(pam_pid, SIGCONT);
904 }
905
906 return err;
907 }
908 #endif
909
910 static void rename_process_from_path(const char *path) {
911 char process_name[11];
912 const char *p;
913 size_t l;
914
915 /* This resulting string must fit in 10 chars (i.e. the length
916 * of "/sbin/init") to look pretty in /bin/ps */
917
918 p = basename(path);
919 if (isempty(p)) {
920 rename_process("(...)");
921 return;
922 }
923
924 l = strlen(p);
925 if (l > 8) {
926 /* The end of the process name is usually more
927 * interesting, since the first bit might just be
928 * "systemd-" */
929 p = p + l - 8;
930 l = 8;
931 }
932
933 process_name[0] = '(';
934 memcpy(process_name+1, p, l);
935 process_name[1+l] = ')';
936 process_name[1+l+1] = 0;
937
938 rename_process(process_name);
939 }
940
941 #ifdef HAVE_SECCOMP
942
943 static int apply_seccomp(const ExecContext *c) {
944 uint32_t negative_action, action;
945 scmp_filter_ctx *seccomp;
946 Iterator i;
947 void *id;
948 int r;
949
950 assert(c);
951
952 negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno);
953
954 seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW);
955 if (!seccomp)
956 return -ENOMEM;
957
958 if (c->syscall_archs) {
959
960 SET_FOREACH(id, c->syscall_archs, i) {
961 r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1);
962 if (r == -EEXIST)
963 continue;
964 if (r < 0)
965 goto finish;
966 }
967
968 } else {
969 r = seccomp_add_secondary_archs(seccomp);
970 if (r < 0)
971 goto finish;
972 }
973
974 action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action;
975 SET_FOREACH(id, c->syscall_filter, i) {
976 r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0);
977 if (r < 0)
978 goto finish;
979 }
980
981 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
982 if (r < 0)
983 goto finish;
984
985 r = seccomp_load(seccomp);
986
987 finish:
988 seccomp_release(seccomp);
989 return r;
990 }
991
992 static int apply_address_families(const ExecContext *c) {
993 scmp_filter_ctx *seccomp;
994 Iterator i;
995 int r;
996
997 assert(c);
998
999 seccomp = seccomp_init(SCMP_ACT_ALLOW);
1000 if (!seccomp)
1001 return -ENOMEM;
1002
1003 r = seccomp_add_secondary_archs(seccomp);
1004 if (r < 0)
1005 goto finish;
1006
1007 if (c->address_families_whitelist) {
1008 int af, first = 0, last = 0;
1009 void *afp;
1010
1011 /* If this is a whitelist, we first block the address
1012 * families that are out of range and then everything
1013 * that is not in the set. First, we find the lowest
1014 * and highest address family in the set. */
1015
1016 SET_FOREACH(afp, c->address_families, i) {
1017 af = PTR_TO_INT(afp);
1018
1019 if (af <= 0 || af >= af_max())
1020 continue;
1021
1022 if (first == 0 || af < first)
1023 first = af;
1024
1025 if (last == 0 || af > last)
1026 last = af;
1027 }
1028
1029 assert((first == 0) == (last == 0));
1030
1031 if (first == 0) {
1032
1033 /* No entries in the valid range, block everything */
1034 r = seccomp_rule_add(
1035 seccomp,
1036 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1037 SCMP_SYS(socket),
1038 0);
1039 if (r < 0)
1040 goto finish;
1041
1042 } else {
1043
1044 /* Block everything below the first entry */
1045 r = seccomp_rule_add(
1046 seccomp,
1047 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1048 SCMP_SYS(socket),
1049 1,
1050 SCMP_A0(SCMP_CMP_LT, first));
1051 if (r < 0)
1052 goto finish;
1053
1054 /* Block everything above the last entry */
1055 r = seccomp_rule_add(
1056 seccomp,
1057 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1058 SCMP_SYS(socket),
1059 1,
1060 SCMP_A0(SCMP_CMP_GT, last));
1061 if (r < 0)
1062 goto finish;
1063
1064 /* Block everything between the first and last
1065 * entry */
1066 for (af = 1; af < af_max(); af++) {
1067
1068 if (set_contains(c->address_families, INT_TO_PTR(af)))
1069 continue;
1070
1071 r = seccomp_rule_add(
1072 seccomp,
1073 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1074 SCMP_SYS(socket),
1075 1,
1076 SCMP_A0(SCMP_CMP_EQ, af));
1077 if (r < 0)
1078 goto finish;
1079 }
1080 }
1081
1082 } else {
1083 void *af;
1084
1085 /* If this is a blacklist, then generate one rule for
1086 * each address family that are then combined in OR
1087 * checks. */
1088
1089 SET_FOREACH(af, c->address_families, i) {
1090
1091 r = seccomp_rule_add(
1092 seccomp,
1093 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1094 SCMP_SYS(socket),
1095 1,
1096 SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af)));
1097 if (r < 0)
1098 goto finish;
1099 }
1100 }
1101
1102 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
1103 if (r < 0)
1104 goto finish;
1105
1106 r = seccomp_load(seccomp);
1107
1108 finish:
1109 seccomp_release(seccomp);
1110 return r;
1111 }
1112
1113 #endif
1114
1115 static void do_idle_pipe_dance(int idle_pipe[4]) {
1116 assert(idle_pipe);
1117
1118
1119 safe_close(idle_pipe[1]);
1120 safe_close(idle_pipe[2]);
1121
1122 if (idle_pipe[0] >= 0) {
1123 int r;
1124
1125 r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC);
1126
1127 if (idle_pipe[3] >= 0 && r == 0 /* timeout */) {
1128 /* Signal systemd that we are bored and want to continue. */
1129 write(idle_pipe[3], "x", 1);
1130
1131 /* Wait for systemd to react to the signal above. */
1132 fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC);
1133 }
1134
1135 safe_close(idle_pipe[0]);
1136
1137 }
1138
1139 safe_close(idle_pipe[3]);
1140 }
1141
1142 static int build_environment(
1143 const ExecContext *c,
1144 unsigned n_fds,
1145 usec_t watchdog_usec,
1146 const char *home,
1147 const char *username,
1148 const char *shell,
1149 char ***ret) {
1150
1151 _cleanup_strv_free_ char **our_env = NULL;
1152 unsigned n_env = 0;
1153 char *x;
1154
1155 assert(c);
1156 assert(ret);
1157
1158 our_env = new0(char*, 10);
1159 if (!our_env)
1160 return -ENOMEM;
1161
1162 if (n_fds > 0) {
1163 if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0)
1164 return -ENOMEM;
1165 our_env[n_env++] = x;
1166
1167 if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0)
1168 return -ENOMEM;
1169 our_env[n_env++] = x;
1170 }
1171
1172 if (watchdog_usec > 0) {
1173 if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0)
1174 return -ENOMEM;
1175 our_env[n_env++] = x;
1176
1177 if (asprintf(&x, "WATCHDOG_USEC="USEC_FMT, watchdog_usec) < 0)
1178 return -ENOMEM;
1179 our_env[n_env++] = x;
1180 }
1181
1182 if (home) {
1183 x = strappend("HOME=", home);
1184 if (!x)
1185 return -ENOMEM;
1186 our_env[n_env++] = x;
1187 }
1188
1189 if (username) {
1190 x = strappend("LOGNAME=", username);
1191 if (!x)
1192 return -ENOMEM;
1193 our_env[n_env++] = x;
1194
1195 x = strappend("USER=", username);
1196 if (!x)
1197 return -ENOMEM;
1198 our_env[n_env++] = x;
1199 }
1200
1201 if (shell) {
1202 x = strappend("SHELL=", shell);
1203 if (!x)
1204 return -ENOMEM;
1205 our_env[n_env++] = x;
1206 }
1207
1208 if (is_terminal_input(c->std_input) ||
1209 c->std_output == EXEC_OUTPUT_TTY ||
1210 c->std_error == EXEC_OUTPUT_TTY ||
1211 c->tty_path) {
1212
1213 x = strdup(default_term_for_tty(tty_path(c)));
1214 if (!x)
1215 return -ENOMEM;
1216 our_env[n_env++] = x;
1217 }
1218
1219 our_env[n_env++] = NULL;
1220 assert(n_env <= 10);
1221
1222 *ret = our_env;
1223 our_env = NULL;
1224
1225 return 0;
1226 }
1227
1228 static int exec_child(ExecCommand *command,
1229 const ExecContext *context,
1230 const ExecParameters *params,
1231 ExecRuntime *runtime,
1232 char **argv,
1233 int socket_fd,
1234 int *fds, unsigned n_fds,
1235 char **files_env,
1236 int *error) {
1237
1238 _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
1239 const char *username = NULL, *home = NULL, *shell = NULL;
1240 unsigned n_dont_close = 0;
1241 int dont_close[n_fds + 4];
1242 uid_t uid = (uid_t) -1;
1243 gid_t gid = (gid_t) -1;
1244 int i, err;
1245
1246 assert(command);
1247 assert(context);
1248 assert(params);
1249 assert(error);
1250
1251 rename_process_from_path(command->path);
1252
1253 /* We reset exactly these signals, since they are the
1254 * only ones we set to SIG_IGN in the main daemon. All
1255 * others we leave untouched because we set them to
1256 * SIG_DFL or a valid handler initially, both of which
1257 * will be demoted to SIG_DFL. */
1258 default_signals(SIGNALS_CRASH_HANDLER,
1259 SIGNALS_IGNORE, -1);
1260
1261 if (context->ignore_sigpipe)
1262 ignore_signals(SIGPIPE, -1);
1263
1264 err = reset_signal_mask();
1265 if (err < 0) {
1266 *error = EXIT_SIGNAL_MASK;
1267 return err;
1268 }
1269
1270 if (params->idle_pipe)
1271 do_idle_pipe_dance(params->idle_pipe);
1272
1273 /* Close sockets very early to make sure we don't
1274 * block init reexecution because it cannot bind its
1275 * sockets */
1276 log_forget_fds();
1277
1278 if (socket_fd >= 0)
1279 dont_close[n_dont_close++] = socket_fd;
1280 if (n_fds > 0) {
1281 memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds);
1282 n_dont_close += n_fds;
1283 }
1284 if (params->bus_endpoint_fd >= 0)
1285 dont_close[n_dont_close++] = params->bus_endpoint_fd;
1286 if (runtime) {
1287 if (runtime->netns_storage_socket[0] >= 0)
1288 dont_close[n_dont_close++] = runtime->netns_storage_socket[0];
1289 if (runtime->netns_storage_socket[1] >= 0)
1290 dont_close[n_dont_close++] = runtime->netns_storage_socket[1];
1291 }
1292
1293 err = close_all_fds(dont_close, n_dont_close);
1294 if (err < 0) {
1295 *error = EXIT_FDS;
1296 return err;
1297 }
1298
1299 if (!context->same_pgrp)
1300 if (setsid() < 0) {
1301 *error = EXIT_SETSID;
1302 return -errno;
1303 }
1304
1305 exec_context_tty_reset(context);
1306
1307 if (params->confirm_spawn) {
1308 char response;
1309
1310 err = ask_for_confirmation(&response, argv);
1311 if (err == -ETIMEDOUT)
1312 write_confirm_message("Confirmation question timed out, assuming positive response.\n");
1313 else if (err < 0)
1314 write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-err));
1315 else if (response == 's') {
1316 write_confirm_message("Skipping execution.\n");
1317 *error = EXIT_CONFIRM;
1318 return -ECANCELED;
1319 } else if (response == 'n') {
1320 write_confirm_message("Failing execution.\n");
1321 *error = 0;
1322 return 0;
1323 }
1324 }
1325
1326 /* If a socket is connected to STDIN/STDOUT/STDERR, we
1327 * must sure to drop O_NONBLOCK */
1328 if (socket_fd >= 0)
1329 fd_nonblock(socket_fd, false);
1330
1331 err = setup_input(context, socket_fd, params->apply_tty_stdin);
1332 if (err < 0) {
1333 *error = EXIT_STDIN;
1334 return err;
1335 }
1336
1337 err = setup_output(context, STDOUT_FILENO, socket_fd, basename(command->path), params->unit_id, params->apply_tty_stdin);
1338 if (err < 0) {
1339 *error = EXIT_STDOUT;
1340 return err;
1341 }
1342
1343 err = setup_output(context, STDERR_FILENO, socket_fd, basename(command->path), params->unit_id, params->apply_tty_stdin);
1344 if (err < 0) {
1345 *error = EXIT_STDERR;
1346 return err;
1347 }
1348
1349 if (params->cgroup_path) {
1350 err = cg_attach_everywhere(params->cgroup_supported, params->cgroup_path, 0);
1351 if (err < 0) {
1352 *error = EXIT_CGROUP;
1353 return err;
1354 }
1355 }
1356
1357 if (context->oom_score_adjust_set) {
1358 char t[16];
1359
1360 snprintf(t, sizeof(t), "%i", context->oom_score_adjust);
1361 char_array_0(t);
1362
1363 if (write_string_file("/proc/self/oom_score_adj", t) < 0) {
1364 *error = EXIT_OOM_ADJUST;
1365 return -errno;
1366 }
1367 }
1368
1369 if (context->nice_set)
1370 if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
1371 *error = EXIT_NICE;
1372 return -errno;
1373 }
1374
1375 if (context->cpu_sched_set) {
1376 struct sched_param param = {
1377 .sched_priority = context->cpu_sched_priority,
1378 };
1379
1380 err = sched_setscheduler(0,
1381 context->cpu_sched_policy |
1382 (context->cpu_sched_reset_on_fork ?
1383 SCHED_RESET_ON_FORK : 0),
1384 &param);
1385 if (err < 0) {
1386 *error = EXIT_SETSCHEDULER;
1387 return -errno;
1388 }
1389 }
1390
1391 if (context->cpuset)
1392 if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
1393 *error = EXIT_CPUAFFINITY;
1394 return -errno;
1395 }
1396
1397 if (context->ioprio_set)
1398 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
1399 *error = EXIT_IOPRIO;
1400 return -errno;
1401 }
1402
1403 if (context->timer_slack_nsec != NSEC_INFINITY)
1404 if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
1405 *error = EXIT_TIMERSLACK;
1406 return -errno;
1407 }
1408
1409 if (context->personality != 0xffffffffUL)
1410 if (personality(context->personality) < 0) {
1411 *error = EXIT_PERSONALITY;
1412 return -errno;
1413 }
1414
1415 if (context->utmp_id)
1416 utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path);
1417
1418 if (context->user) {
1419 username = context->user;
1420 err = get_user_creds(&username, &uid, &gid, &home, &shell);
1421 if (err < 0) {
1422 *error = EXIT_USER;
1423 return err;
1424 }
1425
1426 if (is_terminal_input(context->std_input)) {
1427 err = chown_terminal(STDIN_FILENO, uid);
1428 if (err < 0) {
1429 *error = EXIT_STDIN;
1430 return err;
1431 }
1432 }
1433 }
1434
1435 #ifdef ENABLE_KDBUS
1436 if (params->bus_endpoint_fd >= 0 && context->bus_endpoint) {
1437 uid_t ep_uid = (uid == (uid_t) -1) ? 0 : uid;
1438
1439 err = bus_kernel_set_endpoint_policy(params->bus_endpoint_fd, ep_uid, context->bus_endpoint);
1440 if (err < 0) {
1441 *error = EXIT_BUS_ENDPOINT;
1442 return err;
1443 }
1444 }
1445 #endif
1446
1447 #ifdef HAVE_PAM
1448 if (params->cgroup_path && context->user && context->pam_name) {
1449 err = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0644, uid, gid);
1450 if (err < 0) {
1451 *error = EXIT_CGROUP;
1452 return err;
1453 }
1454
1455
1456 err = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0755, uid, gid);
1457 if (err < 0) {
1458 *error = EXIT_CGROUP;
1459 return err;
1460 }
1461 }
1462 #endif
1463
1464 if (!strv_isempty(context->runtime_directory) && params->runtime_prefix) {
1465 char **rt;
1466
1467 STRV_FOREACH(rt, context->runtime_directory) {
1468 _cleanup_free_ char *p;
1469
1470 p = strjoin(params->runtime_prefix, "/", *rt, NULL);
1471 if (!p) {
1472 *error = EXIT_RUNTIME_DIRECTORY;
1473 return -ENOMEM;
1474 }
1475
1476 err = mkdir_safe(p, context->runtime_directory_mode, uid, gid);
1477 if (err < 0) {
1478 *error = EXIT_RUNTIME_DIRECTORY;
1479 return err;
1480 }
1481 }
1482 }
1483
1484 if (params->apply_permissions) {
1485 err = enforce_groups(context, username, gid);
1486 if (err < 0) {
1487 *error = EXIT_GROUP;
1488 return err;
1489 }
1490 }
1491
1492 umask(context->umask);
1493
1494 #ifdef HAVE_PAM
1495 if (params->apply_permissions && context->pam_name && username) {
1496 err = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds);
1497 if (err < 0) {
1498 *error = EXIT_PAM;
1499 return err;
1500 }
1501 }
1502 #endif
1503
1504 if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) {
1505 err = setup_netns(runtime->netns_storage_socket);
1506 if (err < 0) {
1507 *error = EXIT_NETWORK;
1508 return err;
1509 }
1510 }
1511
1512 if (!strv_isempty(context->read_write_dirs) ||
1513 !strv_isempty(context->read_only_dirs) ||
1514 !strv_isempty(context->inaccessible_dirs) ||
1515 context->mount_flags != 0 ||
1516 (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) ||
1517 params->bus_endpoint_path ||
1518 context->private_devices ||
1519 context->protect_system != PROTECT_SYSTEM_NO ||
1520 context->protect_home != PROTECT_HOME_NO) {
1521
1522 char *tmp = NULL, *var = NULL;
1523
1524 /* The runtime struct only contains the parent
1525 * of the private /tmp, which is
1526 * non-accessible to world users. Inside of it
1527 * there's a /tmp that is sticky, and that's
1528 * the one we want to use here. */
1529
1530 if (context->private_tmp && runtime) {
1531 if (runtime->tmp_dir)
1532 tmp = strappenda(runtime->tmp_dir, "/tmp");
1533 if (runtime->var_tmp_dir)
1534 var = strappenda(runtime->var_tmp_dir, "/tmp");
1535 }
1536
1537 err = setup_namespace(
1538 context->read_write_dirs,
1539 context->read_only_dirs,
1540 context->inaccessible_dirs,
1541 tmp,
1542 var,
1543 params->bus_endpoint_path,
1544 context->private_devices,
1545 context->protect_home,
1546 context->protect_system,
1547 context->mount_flags);
1548
1549 if (err == -EPERM)
1550 log_warning_unit(params->unit_id, "Failed to set up file system namespace due to lack of privileges. Execution sandbox will not be in effect: %s", strerror(-err));
1551 else if (err < 0) {
1552 *error = EXIT_NAMESPACE;
1553 return err;
1554 }
1555 }
1556
1557 if (params->apply_chroot) {
1558 if (context->root_directory)
1559 if (chroot(context->root_directory) < 0) {
1560 *error = EXIT_CHROOT;
1561 return -errno;
1562 }
1563
1564 if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
1565 *error = EXIT_CHDIR;
1566 return -errno;
1567 }
1568 } else {
1569 _cleanup_free_ char *d = NULL;
1570
1571 if (asprintf(&d, "%s/%s",
1572 context->root_directory ? context->root_directory : "",
1573 context->working_directory ? context->working_directory : "") < 0) {
1574 *error = EXIT_MEMORY;
1575 return -ENOMEM;
1576 }
1577
1578 if (chdir(d) < 0) {
1579 *error = EXIT_CHDIR;
1580 return -errno;
1581 }
1582 }
1583
1584 /* We repeat the fd closing here, to make sure that
1585 * nothing is leaked from the PAM modules. Note that
1586 * we are more aggressive this time since socket_fd
1587 * and the netns fds we don't need anymore. The custom
1588 * endpoint fd was needed to upload the policy and can
1589 * now be closed as well. */
1590 err = close_all_fds(fds, n_fds);
1591 if (err >= 0)
1592 err = shift_fds(fds, n_fds);
1593 if (err >= 0)
1594 err = flags_fds(fds, n_fds, context->non_blocking);
1595 if (err < 0) {
1596 *error = EXIT_FDS;
1597 return err;
1598 }
1599
1600 if (params->apply_permissions) {
1601
1602 for (i = 0; i < _RLIMIT_MAX; i++) {
1603 if (!context->rlimit[i])
1604 continue;
1605
1606 if (setrlimit_closest(i, context->rlimit[i]) < 0) {
1607 *error = EXIT_LIMITS;
1608 return -errno;
1609 }
1610 }
1611
1612 if (context->capability_bounding_set_drop) {
1613 err = capability_bounding_set_drop(context->capability_bounding_set_drop, false);
1614 if (err < 0) {
1615 *error = EXIT_CAPABILITIES;
1616 return err;
1617 }
1618 }
1619
1620 if (context->user) {
1621 err = enforce_user(context, uid);
1622 if (err < 0) {
1623 *error = EXIT_USER;
1624 return err;
1625 }
1626 }
1627
1628 /* PR_GET_SECUREBITS is not privileged, while
1629 * PR_SET_SECUREBITS is. So to suppress
1630 * potential EPERMs we'll try not to call
1631 * PR_SET_SECUREBITS unless necessary. */
1632 if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
1633 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
1634 *error = EXIT_SECUREBITS;
1635 return -errno;
1636 }
1637
1638 if (context->capabilities)
1639 if (cap_set_proc(context->capabilities) < 0) {
1640 *error = EXIT_CAPABILITIES;
1641 return -errno;
1642 }
1643
1644 if (context->no_new_privileges)
1645 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
1646 *error = EXIT_NO_NEW_PRIVILEGES;
1647 return -errno;
1648 }
1649
1650 #ifdef HAVE_SECCOMP
1651 if (context->address_families_whitelist ||
1652 !set_isempty(context->address_families)) {
1653 err = apply_address_families(context);
1654 if (err < 0) {
1655 *error = EXIT_ADDRESS_FAMILIES;
1656 return err;
1657 }
1658 }
1659
1660 if (context->syscall_whitelist ||
1661 !set_isempty(context->syscall_filter) ||
1662 !set_isempty(context->syscall_archs)) {
1663 err = apply_seccomp(context);
1664 if (err < 0) {
1665 *error = EXIT_SECCOMP;
1666 return err;
1667 }
1668 }
1669 #endif
1670
1671 #ifdef HAVE_SELINUX
1672 if (use_selinux()) {
1673 if (context->selinux_context) {
1674 err = setexeccon(context->selinux_context);
1675 if (err < 0 && !context->selinux_context_ignore) {
1676 *error = EXIT_SELINUX_CONTEXT;
1677 return err;
1678 }
1679 }
1680
1681 if (params->selinux_context_net && socket_fd >= 0) {
1682 _cleanup_free_ char *label = NULL;
1683
1684 err = label_get_child_mls_label(socket_fd, command->path, &label);
1685 if (err < 0) {
1686 *error = EXIT_SELINUX_CONTEXT;
1687 return err;
1688 }
1689
1690 err = setexeccon(label);
1691 if (err < 0) {
1692 *error = EXIT_SELINUX_CONTEXT;
1693 return err;
1694 }
1695 }
1696 }
1697 #endif
1698
1699 #ifdef HAVE_APPARMOR
1700 if (context->apparmor_profile && use_apparmor()) {
1701 err = aa_change_onexec(context->apparmor_profile);
1702 if (err < 0 && !context->apparmor_profile_ignore) {
1703 *error = EXIT_APPARMOR_PROFILE;
1704 return -errno;
1705 }
1706 }
1707 #endif
1708 }
1709
1710 err = build_environment(context, n_fds, params->watchdog_usec, home, username, shell, &our_env);
1711 if (err < 0) {
1712 *error = EXIT_MEMORY;
1713 return err;
1714 }
1715
1716 final_env = strv_env_merge(5,
1717 params->environment,
1718 our_env,
1719 context->environment,
1720 files_env,
1721 pam_env,
1722 NULL);
1723 if (!final_env) {
1724 *error = EXIT_MEMORY;
1725 return -ENOMEM;
1726 }
1727
1728 final_argv = replace_env_argv(argv, final_env);
1729 if (!final_argv) {
1730 *error = EXIT_MEMORY;
1731 return -ENOMEM;
1732 }
1733
1734 final_env = strv_env_clean(final_env);
1735
1736 if (_unlikely_(log_get_max_level() >= LOG_PRI(LOG_DEBUG))) {
1737 _cleanup_free_ char *line;
1738
1739 line = exec_command_line(final_argv);
1740 if (line) {
1741 log_open();
1742 log_struct_unit(LOG_DEBUG,
1743 params->unit_id,
1744 "EXECUTABLE=%s", command->path,
1745 "MESSAGE=Executing: %s", line,
1746 NULL);
1747 log_close();
1748 }
1749 }
1750 execve(command->path, final_argv, final_env);
1751 *error = EXIT_EXEC;
1752 return -errno;
1753 }
1754
1755 int exec_spawn(ExecCommand *command,
1756 const ExecContext *context,
1757 const ExecParameters *params,
1758 ExecRuntime *runtime,
1759 pid_t *ret) {
1760
1761 _cleanup_strv_free_ char **files_env = NULL;
1762 int *fds = NULL; unsigned n_fds = 0;
1763 char *line, **argv;
1764 int socket_fd;
1765 pid_t pid;
1766 int err;
1767
1768 assert(command);
1769 assert(context);
1770 assert(ret);
1771 assert(params);
1772 assert(params->fds || params->n_fds <= 0);
1773
1774 if (context->std_input == EXEC_INPUT_SOCKET ||
1775 context->std_output == EXEC_OUTPUT_SOCKET ||
1776 context->std_error == EXEC_OUTPUT_SOCKET) {
1777
1778 if (params->n_fds != 1)
1779 return -EINVAL;
1780
1781 socket_fd = params->fds[0];
1782 } else {
1783 socket_fd = -1;
1784 fds = params->fds;
1785 n_fds = params->n_fds;
1786 }
1787
1788 err = exec_context_load_environment(context, &files_env);
1789 if (err < 0) {
1790 log_struct_unit(LOG_ERR,
1791 params->unit_id,
1792 "MESSAGE=Failed to load environment files: %s", strerror(-err),
1793 "ERRNO=%d", -err,
1794 NULL);
1795 return err;
1796 }
1797
1798 argv = params->argv ?: command->argv;
1799
1800 line = exec_command_line(argv);
1801 if (!line)
1802 return log_oom();
1803
1804 log_struct_unit(LOG_DEBUG,
1805 params->unit_id,
1806 "EXECUTABLE=%s", command->path,
1807 "MESSAGE=About to execute: %s", line,
1808 NULL);
1809 free(line);
1810
1811 pid = fork();
1812 if (pid < 0)
1813 return -errno;
1814
1815 if (pid == 0) {
1816 int r;
1817
1818 err = exec_child(command,
1819 context,
1820 params,
1821 runtime,
1822 argv,
1823 socket_fd,
1824 fds, n_fds,
1825 files_env,
1826 &r);
1827 if (r != 0) {
1828 log_open();
1829 log_struct(LOG_ERR, MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED),
1830 "EXECUTABLE=%s", command->path,
1831 "MESSAGE=Failed at step %s spawning %s: %s",
1832 exit_status_to_string(r, EXIT_STATUS_SYSTEMD),
1833 command->path, strerror(-err),
1834 "ERRNO=%d", -err,
1835 NULL);
1836 log_close();
1837 }
1838
1839 _exit(r);
1840 }
1841
1842 log_struct_unit(LOG_DEBUG,
1843 params->unit_id,
1844 "MESSAGE=Forked %s as "PID_FMT,
1845 command->path, pid,
1846 NULL);
1847
1848 /* We add the new process to the cgroup both in the child (so
1849 * that we can be sure that no user code is ever executed
1850 * outside of the cgroup) and in the parent (so that we can be
1851 * sure that when we kill the cgroup the process will be
1852 * killed too). */
1853 if (params->cgroup_path)
1854 cg_attach(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, pid);
1855
1856 exec_status_start(&command->exec_status, pid);
1857
1858 *ret = pid;
1859 return 0;
1860 }
1861
1862 void exec_context_init(ExecContext *c) {
1863 assert(c);
1864
1865 c->umask = 0022;
1866 c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
1867 c->cpu_sched_policy = SCHED_OTHER;
1868 c->syslog_priority = LOG_DAEMON|LOG_INFO;
1869 c->syslog_level_prefix = true;
1870 c->ignore_sigpipe = true;
1871 c->timer_slack_nsec = NSEC_INFINITY;
1872 c->personality = 0xffffffffUL;
1873 c->runtime_directory_mode = 0755;
1874 }
1875
1876 void exec_context_done(ExecContext *c) {
1877 unsigned l;
1878
1879 assert(c);
1880
1881 strv_free(c->environment);
1882 c->environment = NULL;
1883
1884 strv_free(c->environment_files);
1885 c->environment_files = NULL;
1886
1887 for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
1888 free(c->rlimit[l]);
1889 c->rlimit[l] = NULL;
1890 }
1891
1892 free(c->working_directory);
1893 c->working_directory = NULL;
1894 free(c->root_directory);
1895 c->root_directory = NULL;
1896
1897 free(c->tty_path);
1898 c->tty_path = NULL;
1899
1900 free(c->syslog_identifier);
1901 c->syslog_identifier = NULL;
1902
1903 free(c->user);
1904 c->user = NULL;
1905
1906 free(c->group);
1907 c->group = NULL;
1908
1909 strv_free(c->supplementary_groups);
1910 c->supplementary_groups = NULL;
1911
1912 free(c->pam_name);
1913 c->pam_name = NULL;
1914
1915 if (c->capabilities) {
1916 cap_free(c->capabilities);
1917 c->capabilities = NULL;
1918 }
1919
1920 strv_free(c->read_only_dirs);
1921 c->read_only_dirs = NULL;
1922
1923 strv_free(c->read_write_dirs);
1924 c->read_write_dirs = NULL;
1925
1926 strv_free(c->inaccessible_dirs);
1927 c->inaccessible_dirs = NULL;
1928
1929 if (c->cpuset)
1930 CPU_FREE(c->cpuset);
1931
1932 free(c->utmp_id);
1933 c->utmp_id = NULL;
1934
1935 free(c->selinux_context);
1936 c->selinux_context = NULL;
1937
1938 free(c->apparmor_profile);
1939 c->apparmor_profile = NULL;
1940
1941 set_free(c->syscall_filter);
1942 c->syscall_filter = NULL;
1943
1944 set_free(c->syscall_archs);
1945 c->syscall_archs = NULL;
1946
1947 set_free(c->address_families);
1948 c->address_families = NULL;
1949
1950 strv_free(c->runtime_directory);
1951 c->runtime_directory = NULL;
1952
1953 bus_endpoint_free(c->bus_endpoint);
1954 c->bus_endpoint = NULL;
1955 }
1956
1957 int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) {
1958 char **i;
1959
1960 assert(c);
1961
1962 if (!runtime_prefix)
1963 return 0;
1964
1965 STRV_FOREACH(i, c->runtime_directory) {
1966 _cleanup_free_ char *p;
1967
1968 p = strjoin(runtime_prefix, "/", *i, NULL);
1969 if (!p)
1970 return -ENOMEM;
1971
1972 /* We execute this synchronously, since we need to be
1973 * sure this is gone when we start the service
1974 * next. */
1975 rm_rf_dangerous(p, false, true, false);
1976 }
1977
1978 return 0;
1979 }
1980
1981 void exec_command_done(ExecCommand *c) {
1982 assert(c);
1983
1984 free(c->path);
1985 c->path = NULL;
1986
1987 strv_free(c->argv);
1988 c->argv = NULL;
1989 }
1990
1991 void exec_command_done_array(ExecCommand *c, unsigned n) {
1992 unsigned i;
1993
1994 for (i = 0; i < n; i++)
1995 exec_command_done(c+i);
1996 }
1997
1998 void exec_command_free_list(ExecCommand *c) {
1999 ExecCommand *i;
2000
2001 while ((i = c)) {
2002 LIST_REMOVE(command, c, i);
2003 exec_command_done(i);
2004 free(i);
2005 }
2006 }
2007
2008 void exec_command_free_array(ExecCommand **c, unsigned n) {
2009 unsigned i;
2010
2011 for (i = 0; i < n; i++) {
2012 exec_command_free_list(c[i]);
2013 c[i] = NULL;
2014 }
2015 }
2016
2017 int exec_context_load_environment(const ExecContext *c, char ***l) {
2018 char **i, **r = NULL;
2019
2020 assert(c);
2021 assert(l);
2022
2023 STRV_FOREACH(i, c->environment_files) {
2024 char *fn;
2025 int k;
2026 bool ignore = false;
2027 char **p;
2028 _cleanup_globfree_ glob_t pglob = {};
2029 int count, n;
2030
2031 fn = *i;
2032
2033 if (fn[0] == '-') {
2034 ignore = true;
2035 fn ++;
2036 }
2037
2038 if (!path_is_absolute(fn)) {
2039 if (ignore)
2040 continue;
2041
2042 strv_free(r);
2043 return -EINVAL;
2044 }
2045
2046 /* Filename supports globbing, take all matching files */
2047 errno = 0;
2048 if (glob(fn, 0, NULL, &pglob) != 0) {
2049 if (ignore)
2050 continue;
2051
2052 strv_free(r);
2053 return errno ? -errno : -EINVAL;
2054 }
2055 count = pglob.gl_pathc;
2056 if (count == 0) {
2057 if (ignore)
2058 continue;
2059
2060 strv_free(r);
2061 return -EINVAL;
2062 }
2063 for (n = 0; n < count; n++) {
2064 k = load_env_file(NULL, pglob.gl_pathv[n], NULL, &p);
2065 if (k < 0) {
2066 if (ignore)
2067 continue;
2068
2069 strv_free(r);
2070 return k;
2071 }
2072 /* Log invalid environment variables with filename */
2073 if (p)
2074 p = strv_env_clean_log(p, pglob.gl_pathv[n]);
2075
2076 if (r == NULL)
2077 r = p;
2078 else {
2079 char **m;
2080
2081 m = strv_env_merge(2, r, p);
2082 strv_free(r);
2083 strv_free(p);
2084 if (!m)
2085 return -ENOMEM;
2086
2087 r = m;
2088 }
2089 }
2090 }
2091
2092 *l = r;
2093
2094 return 0;
2095 }
2096
2097 static bool tty_may_match_dev_console(const char *tty) {
2098 _cleanup_free_ char *active = NULL;
2099 char *console;
2100
2101 if (startswith(tty, "/dev/"))
2102 tty += 5;
2103
2104 /* trivial identity? */
2105 if (streq(tty, "console"))
2106 return true;
2107
2108 console = resolve_dev_console(&active);
2109 /* if we could not resolve, assume it may */
2110 if (!console)
2111 return true;
2112
2113 /* "tty0" means the active VC, so it may be the same sometimes */
2114 return streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty));
2115 }
2116
2117 bool exec_context_may_touch_console(ExecContext *ec) {
2118 return (ec->tty_reset || ec->tty_vhangup || ec->tty_vt_disallocate ||
2119 is_terminal_input(ec->std_input) ||
2120 is_terminal_output(ec->std_output) ||
2121 is_terminal_output(ec->std_error)) &&
2122 tty_may_match_dev_console(tty_path(ec));
2123 }
2124
2125 static void strv_fprintf(FILE *f, char **l) {
2126 char **g;
2127
2128 assert(f);
2129
2130 STRV_FOREACH(g, l)
2131 fprintf(f, " %s", *g);
2132 }
2133
2134 void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
2135 char **e;
2136 unsigned i;
2137
2138 assert(c);
2139 assert(f);
2140
2141 prefix = strempty(prefix);
2142
2143 fprintf(f,
2144 "%sUMask: %04o\n"
2145 "%sWorkingDirectory: %s\n"
2146 "%sRootDirectory: %s\n"
2147 "%sNonBlocking: %s\n"
2148 "%sPrivateTmp: %s\n"
2149 "%sPrivateNetwork: %s\n"
2150 "%sPrivateDevices: %s\n"
2151 "%sProtectHome: %s\n"
2152 "%sProtectSystem: %s\n"
2153 "%sIgnoreSIGPIPE: %s\n",
2154 prefix, c->umask,
2155 prefix, c->working_directory ? c->working_directory : "/",
2156 prefix, c->root_directory ? c->root_directory : "/",
2157 prefix, yes_no(c->non_blocking),
2158 prefix, yes_no(c->private_tmp),
2159 prefix, yes_no(c->private_network),
2160 prefix, yes_no(c->private_devices),
2161 prefix, protect_home_to_string(c->protect_home),
2162 prefix, protect_system_to_string(c->protect_system),
2163 prefix, yes_no(c->ignore_sigpipe));
2164
2165 STRV_FOREACH(e, c->environment)
2166 fprintf(f, "%sEnvironment: %s\n", prefix, *e);
2167
2168 STRV_FOREACH(e, c->environment_files)
2169 fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e);
2170
2171 if (c->nice_set)
2172 fprintf(f,
2173 "%sNice: %i\n",
2174 prefix, c->nice);
2175
2176 if (c->oom_score_adjust_set)
2177 fprintf(f,
2178 "%sOOMScoreAdjust: %i\n",
2179 prefix, c->oom_score_adjust);
2180
2181 for (i = 0; i < RLIM_NLIMITS; i++)
2182 if (c->rlimit[i])
2183 fprintf(f, "%s%s: "RLIM_FMT"\n",
2184 prefix, rlimit_to_string(i), c->rlimit[i]->rlim_max);
2185
2186 if (c->ioprio_set) {
2187 _cleanup_free_ char *class_str = NULL;
2188
2189 ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str);
2190 fprintf(f,
2191 "%sIOSchedulingClass: %s\n"
2192 "%sIOPriority: %i\n",
2193 prefix, strna(class_str),
2194 prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
2195 }
2196
2197 if (c->cpu_sched_set) {
2198 _cleanup_free_ char *policy_str = NULL;
2199
2200 sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str);
2201 fprintf(f,
2202 "%sCPUSchedulingPolicy: %s\n"
2203 "%sCPUSchedulingPriority: %i\n"
2204 "%sCPUSchedulingResetOnFork: %s\n",
2205 prefix, strna(policy_str),
2206 prefix, c->cpu_sched_priority,
2207 prefix, yes_no(c->cpu_sched_reset_on_fork));
2208 }
2209
2210 if (c->cpuset) {
2211 fprintf(f, "%sCPUAffinity:", prefix);
2212 for (i = 0; i < c->cpuset_ncpus; i++)
2213 if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset))
2214 fprintf(f, " %u", i);
2215 fputs("\n", f);
2216 }
2217
2218 if (c->timer_slack_nsec != NSEC_INFINITY)
2219 fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec);
2220
2221 fprintf(f,
2222 "%sStandardInput: %s\n"
2223 "%sStandardOutput: %s\n"
2224 "%sStandardError: %s\n",
2225 prefix, exec_input_to_string(c->std_input),
2226 prefix, exec_output_to_string(c->std_output),
2227 prefix, exec_output_to_string(c->std_error));
2228
2229 if (c->tty_path)
2230 fprintf(f,
2231 "%sTTYPath: %s\n"
2232 "%sTTYReset: %s\n"
2233 "%sTTYVHangup: %s\n"
2234 "%sTTYVTDisallocate: %s\n",
2235 prefix, c->tty_path,
2236 prefix, yes_no(c->tty_reset),
2237 prefix, yes_no(c->tty_vhangup),
2238 prefix, yes_no(c->tty_vt_disallocate));
2239
2240 if (c->std_output == EXEC_OUTPUT_SYSLOG ||
2241 c->std_output == EXEC_OUTPUT_KMSG ||
2242 c->std_output == EXEC_OUTPUT_JOURNAL ||
2243 c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
2244 c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
2245 c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE ||
2246 c->std_error == EXEC_OUTPUT_SYSLOG ||
2247 c->std_error == EXEC_OUTPUT_KMSG ||
2248 c->std_error == EXEC_OUTPUT_JOURNAL ||
2249 c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
2250 c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
2251 c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) {
2252
2253 _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL;
2254
2255 log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str);
2256 log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str);
2257
2258 fprintf(f,
2259 "%sSyslogFacility: %s\n"
2260 "%sSyslogLevel: %s\n",
2261 prefix, strna(fac_str),
2262 prefix, strna(lvl_str));
2263 }
2264
2265 if (c->capabilities) {
2266 _cleanup_cap_free_charp_ char *t;
2267
2268 t = cap_to_text(c->capabilities, NULL);
2269 if (t)
2270 fprintf(f, "%sCapabilities: %s\n", prefix, t);
2271 }
2272
2273 if (c->secure_bits)
2274 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
2275 prefix,
2276 (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "",
2277 (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
2278 (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
2279 (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
2280 (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "",
2281 (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
2282
2283 if (c->capability_bounding_set_drop) {
2284 unsigned long l;
2285 fprintf(f, "%sCapabilityBoundingSet:", prefix);
2286
2287 for (l = 0; l <= cap_last_cap(); l++)
2288 if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) {
2289 _cleanup_cap_free_charp_ char *t;
2290
2291 t = cap_to_name(l);
2292 if (t)
2293 fprintf(f, " %s", t);
2294 }
2295
2296 fputs("\n", f);
2297 }
2298
2299 if (c->user)
2300 fprintf(f, "%sUser: %s\n", prefix, c->user);
2301 if (c->group)
2302 fprintf(f, "%sGroup: %s\n", prefix, c->group);
2303
2304 if (strv_length(c->supplementary_groups) > 0) {
2305 fprintf(f, "%sSupplementaryGroups:", prefix);
2306 strv_fprintf(f, c->supplementary_groups);
2307 fputs("\n", f);
2308 }
2309
2310 if (c->pam_name)
2311 fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name);
2312
2313 if (strv_length(c->read_write_dirs) > 0) {
2314 fprintf(f, "%sReadWriteDirs:", prefix);
2315 strv_fprintf(f, c->read_write_dirs);
2316 fputs("\n", f);
2317 }
2318
2319 if (strv_length(c->read_only_dirs) > 0) {
2320 fprintf(f, "%sReadOnlyDirs:", prefix);
2321 strv_fprintf(f, c->read_only_dirs);
2322 fputs("\n", f);
2323 }
2324
2325 if (strv_length(c->inaccessible_dirs) > 0) {
2326 fprintf(f, "%sInaccessibleDirs:", prefix);
2327 strv_fprintf(f, c->inaccessible_dirs);
2328 fputs("\n", f);
2329 }
2330
2331 if (c->utmp_id)
2332 fprintf(f,
2333 "%sUtmpIdentifier: %s\n",
2334 prefix, c->utmp_id);
2335
2336 if (c->selinux_context)
2337 fprintf(f,
2338 "%sSELinuxContext: %s%s\n",
2339 prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context);
2340
2341 if (c->personality != 0xffffffffUL)
2342 fprintf(f,
2343 "%sPersonality: %s\n",
2344 prefix, strna(personality_to_string(c->personality)));
2345
2346 if (c->syscall_filter) {
2347 #ifdef HAVE_SECCOMP
2348 Iterator j;
2349 void *id;
2350 bool first = true;
2351 #endif
2352
2353 fprintf(f,
2354 "%sSystemCallFilter: ",
2355 prefix);
2356
2357 if (!c->syscall_whitelist)
2358 fputc('~', f);
2359
2360 #ifdef HAVE_SECCOMP
2361 SET_FOREACH(id, c->syscall_filter, j) {
2362 _cleanup_free_ char *name = NULL;
2363
2364 if (first)
2365 first = false;
2366 else
2367 fputc(' ', f);
2368
2369 name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1);
2370 fputs(strna(name), f);
2371 }
2372 #endif
2373
2374 fputc('\n', f);
2375 }
2376
2377 if (c->syscall_archs) {
2378 #ifdef HAVE_SECCOMP
2379 Iterator j;
2380 void *id;
2381 #endif
2382
2383 fprintf(f,
2384 "%sSystemCallArchitectures:",
2385 prefix);
2386
2387 #ifdef HAVE_SECCOMP
2388 SET_FOREACH(id, c->syscall_archs, j)
2389 fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1)));
2390 #endif
2391 fputc('\n', f);
2392 }
2393
2394 if (c->syscall_errno != 0)
2395 fprintf(f,
2396 "%sSystemCallErrorNumber: %s\n",
2397 prefix, strna(errno_to_name(c->syscall_errno)));
2398
2399 if (c->apparmor_profile)
2400 fprintf(f,
2401 "%sAppArmorProfile: %s%s\n",
2402 prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile);
2403 }
2404
2405 void exec_status_start(ExecStatus *s, pid_t pid) {
2406 assert(s);
2407
2408 zero(*s);
2409 s->pid = pid;
2410 dual_timestamp_get(&s->start_timestamp);
2411 }
2412
2413 void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) {
2414 assert(s);
2415
2416 if (s->pid && s->pid != pid)
2417 zero(*s);
2418
2419 s->pid = pid;
2420 dual_timestamp_get(&s->exit_timestamp);
2421
2422 s->code = code;
2423 s->status = status;
2424
2425 if (context) {
2426 if (context->utmp_id)
2427 utmp_put_dead_process(context->utmp_id, pid, code, status);
2428
2429 exec_context_tty_reset(context);
2430 }
2431 }
2432
2433 void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
2434 char buf[FORMAT_TIMESTAMP_MAX];
2435
2436 assert(s);
2437 assert(f);
2438
2439 if (s->pid <= 0)
2440 return;
2441
2442 prefix = strempty(prefix);
2443
2444 fprintf(f,
2445 "%sPID: "PID_FMT"\n",
2446 prefix, s->pid);
2447
2448 if (s->start_timestamp.realtime > 0)
2449 fprintf(f,
2450 "%sStart Timestamp: %s\n",
2451 prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime));
2452
2453 if (s->exit_timestamp.realtime > 0)
2454 fprintf(f,
2455 "%sExit Timestamp: %s\n"
2456 "%sExit Code: %s\n"
2457 "%sExit Status: %i\n",
2458 prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime),
2459 prefix, sigchld_code_to_string(s->code),
2460 prefix, s->status);
2461 }
2462
2463 char *exec_command_line(char **argv) {
2464 size_t k;
2465 char *n, *p, **a;
2466 bool first = true;
2467
2468 assert(argv);
2469
2470 k = 1;
2471 STRV_FOREACH(a, argv)
2472 k += strlen(*a)+3;
2473
2474 if (!(n = new(char, k)))
2475 return NULL;
2476
2477 p = n;
2478 STRV_FOREACH(a, argv) {
2479
2480 if (!first)
2481 *(p++) = ' ';
2482 else
2483 first = false;
2484
2485 if (strpbrk(*a, WHITESPACE)) {
2486 *(p++) = '\'';
2487 p = stpcpy(p, *a);
2488 *(p++) = '\'';
2489 } else
2490 p = stpcpy(p, *a);
2491
2492 }
2493
2494 *p = 0;
2495
2496 /* FIXME: this doesn't really handle arguments that have
2497 * spaces and ticks in them */
2498
2499 return n;
2500 }
2501
2502 void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
2503 _cleanup_free_ char *cmd = NULL;
2504 const char *prefix2;
2505
2506 assert(c);
2507 assert(f);
2508
2509 prefix = strempty(prefix);
2510 prefix2 = strappenda(prefix, "\t");
2511
2512 cmd = exec_command_line(c->argv);
2513 fprintf(f,
2514 "%sCommand Line: %s\n",
2515 prefix, cmd ? cmd : strerror(ENOMEM));
2516
2517 exec_status_dump(&c->exec_status, f, prefix2);
2518 }
2519
2520 void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
2521 assert(f);
2522
2523 prefix = strempty(prefix);
2524
2525 LIST_FOREACH(command, c, c)
2526 exec_command_dump(c, f, prefix);
2527 }
2528
2529 void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
2530 ExecCommand *end;
2531
2532 assert(l);
2533 assert(e);
2534
2535 if (*l) {
2536 /* It's kind of important, that we keep the order here */
2537 LIST_FIND_TAIL(command, *l, end);
2538 LIST_INSERT_AFTER(command, *l, end, e);
2539 } else
2540 *l = e;
2541 }
2542
2543 int exec_command_set(ExecCommand *c, const char *path, ...) {
2544 va_list ap;
2545 char **l, *p;
2546
2547 assert(c);
2548 assert(path);
2549
2550 va_start(ap, path);
2551 l = strv_new_ap(path, ap);
2552 va_end(ap);
2553
2554 if (!l)
2555 return -ENOMEM;
2556
2557 p = strdup(path);
2558 if (!p) {
2559 strv_free(l);
2560 return -ENOMEM;
2561 }
2562
2563 free(c->path);
2564 c->path = p;
2565
2566 strv_free(c->argv);
2567 c->argv = l;
2568
2569 return 0;
2570 }
2571
2572 int exec_command_append(ExecCommand *c, const char *path, ...) {
2573 _cleanup_strv_free_ char **l = NULL;
2574 va_list ap;
2575 int r;
2576
2577 assert(c);
2578 assert(path);
2579
2580 va_start(ap, path);
2581 l = strv_new_ap(path, ap);
2582 va_end(ap);
2583
2584 if (!l)
2585 return -ENOMEM;
2586
2587 r = strv_extend_strv(&c->argv, l);
2588 if (r < 0)
2589 return r;
2590
2591 return 0;
2592 }
2593
2594
2595 static int exec_runtime_allocate(ExecRuntime **rt) {
2596
2597 if (*rt)
2598 return 0;
2599
2600 *rt = new0(ExecRuntime, 1);
2601 if (!*rt)
2602 return -ENOMEM;
2603
2604 (*rt)->n_ref = 1;
2605 (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1;
2606
2607 return 0;
2608 }
2609
2610 int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) {
2611 int r;
2612
2613 assert(rt);
2614 assert(c);
2615 assert(id);
2616
2617 if (*rt)
2618 return 1;
2619
2620 if (!c->private_network && !c->private_tmp)
2621 return 0;
2622
2623 r = exec_runtime_allocate(rt);
2624 if (r < 0)
2625 return r;
2626
2627 if (c->private_network && (*rt)->netns_storage_socket[0] < 0) {
2628 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, (*rt)->netns_storage_socket) < 0)
2629 return -errno;
2630 }
2631
2632 if (c->private_tmp && !(*rt)->tmp_dir) {
2633 r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir);
2634 if (r < 0)
2635 return r;
2636 }
2637
2638 return 1;
2639 }
2640
2641 ExecRuntime *exec_runtime_ref(ExecRuntime *r) {
2642 assert(r);
2643 assert(r->n_ref > 0);
2644
2645 r->n_ref++;
2646 return r;
2647 }
2648
2649 ExecRuntime *exec_runtime_unref(ExecRuntime *r) {
2650
2651 if (!r)
2652 return NULL;
2653
2654 assert(r->n_ref > 0);
2655
2656 r->n_ref--;
2657 if (r->n_ref <= 0) {
2658 free(r->tmp_dir);
2659 free(r->var_tmp_dir);
2660 safe_close_pair(r->netns_storage_socket);
2661 free(r);
2662 }
2663
2664 return NULL;
2665 }
2666
2667 int exec_runtime_serialize(ExecRuntime *rt, Unit *u, FILE *f, FDSet *fds) {
2668 assert(u);
2669 assert(f);
2670 assert(fds);
2671
2672 if (!rt)
2673 return 0;
2674
2675 if (rt->tmp_dir)
2676 unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir);
2677
2678 if (rt->var_tmp_dir)
2679 unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir);
2680
2681 if (rt->netns_storage_socket[0] >= 0) {
2682 int copy;
2683
2684 copy = fdset_put_dup(fds, rt->netns_storage_socket[0]);
2685 if (copy < 0)
2686 return copy;
2687
2688 unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy);
2689 }
2690
2691 if (rt->netns_storage_socket[1] >= 0) {
2692 int copy;
2693
2694 copy = fdset_put_dup(fds, rt->netns_storage_socket[1]);
2695 if (copy < 0)
2696 return copy;
2697
2698 unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy);
2699 }
2700
2701 return 0;
2702 }
2703
2704 int exec_runtime_deserialize_item(ExecRuntime **rt, Unit *u, const char *key, const char *value, FDSet *fds) {
2705 int r;
2706
2707 assert(rt);
2708 assert(key);
2709 assert(value);
2710
2711 if (streq(key, "tmp-dir")) {
2712 char *copy;
2713
2714 r = exec_runtime_allocate(rt);
2715 if (r < 0)
2716 return r;
2717
2718 copy = strdup(value);
2719 if (!copy)
2720 return log_oom();
2721
2722 free((*rt)->tmp_dir);
2723 (*rt)->tmp_dir = copy;
2724
2725 } else if (streq(key, "var-tmp-dir")) {
2726 char *copy;
2727
2728 r = exec_runtime_allocate(rt);
2729 if (r < 0)
2730 return r;
2731
2732 copy = strdup(value);
2733 if (!copy)
2734 return log_oom();
2735
2736 free((*rt)->var_tmp_dir);
2737 (*rt)->var_tmp_dir = copy;
2738
2739 } else if (streq(key, "netns-socket-0")) {
2740 int fd;
2741
2742 r = exec_runtime_allocate(rt);
2743 if (r < 0)
2744 return r;
2745
2746 if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
2747 log_debug_unit(u->id, "Failed to parse netns socket value %s", value);
2748 else {
2749 safe_close((*rt)->netns_storage_socket[0]);
2750 (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd);
2751 }
2752 } else if (streq(key, "netns-socket-1")) {
2753 int fd;
2754
2755 r = exec_runtime_allocate(rt);
2756 if (r < 0)
2757 return r;
2758
2759 if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
2760 log_debug_unit(u->id, "Failed to parse netns socket value %s", value);
2761 else {
2762 safe_close((*rt)->netns_storage_socket[1]);
2763 (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd);
2764 }
2765 } else
2766 return 0;
2767
2768 return 1;
2769 }
2770
2771 static void *remove_tmpdir_thread(void *p) {
2772 _cleanup_free_ char *path = p;
2773
2774 rm_rf_dangerous(path, false, true, false);
2775 return NULL;
2776 }
2777
2778 void exec_runtime_destroy(ExecRuntime *rt) {
2779 int r;
2780
2781 if (!rt)
2782 return;
2783
2784 /* If there are multiple users of this, let's leave the stuff around */
2785 if (rt->n_ref > 1)
2786 return;
2787
2788 if (rt->tmp_dir) {
2789 log_debug("Spawning thread to nuke %s", rt->tmp_dir);
2790
2791 r = asynchronous_job(remove_tmpdir_thread, rt->tmp_dir);
2792 if (r < 0) {
2793 log_warning("Failed to nuke %s: %s", rt->tmp_dir, strerror(-r));
2794 free(rt->tmp_dir);
2795 }
2796
2797 rt->tmp_dir = NULL;
2798 }
2799
2800 if (rt->var_tmp_dir) {
2801 log_debug("Spawning thread to nuke %s", rt->var_tmp_dir);
2802
2803 r = asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir);
2804 if (r < 0) {
2805 log_warning("Failed to nuke %s: %s", rt->var_tmp_dir, strerror(-r));
2806 free(rt->var_tmp_dir);
2807 }
2808
2809 rt->var_tmp_dir = NULL;
2810 }
2811
2812 safe_close_pair(rt->netns_storage_socket);
2813 }
2814
2815 static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
2816 [EXEC_INPUT_NULL] = "null",
2817 [EXEC_INPUT_TTY] = "tty",
2818 [EXEC_INPUT_TTY_FORCE] = "tty-force",
2819 [EXEC_INPUT_TTY_FAIL] = "tty-fail",
2820 [EXEC_INPUT_SOCKET] = "socket"
2821 };
2822
2823 DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
2824
2825 static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
2826 [EXEC_OUTPUT_INHERIT] = "inherit",
2827 [EXEC_OUTPUT_NULL] = "null",
2828 [EXEC_OUTPUT_TTY] = "tty",
2829 [EXEC_OUTPUT_SYSLOG] = "syslog",
2830 [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console",
2831 [EXEC_OUTPUT_KMSG] = "kmsg",
2832 [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console",
2833 [EXEC_OUTPUT_JOURNAL] = "journal",
2834 [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console",
2835 [EXEC_OUTPUT_SOCKET] = "socket"
2836 };
2837
2838 DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
Unnamed repository; edit this file 'description' to name the repository.