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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 "tcpwrap.h"
73#include "exit-status.h"
74#include "missing.h"
75#include "utmp-wtmp.h"
76#include "def.h"
77#include "path-util.h"
78#include "env-util.h"
79#include "fileio.h"
80#include "unit.h"
81#include "async.h"
82#include "selinux-util.h"
83#include "errno-list.h"
84#include "af-list.h"
85#include "apparmor-util.h"
86
87#ifdef HAVE_SECCOMP
88#include "seccomp-util.h"
89#endif
90
91#define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC)
92#define IDLE_TIMEOUT2_USEC (1*USEC_PER_SEC)
93
94/* This assumes there is a 'tty' group */
95#define TTY_MODE 0620
96
97#define SNDBUF_SIZE (8*1024*1024)
98
99static int shift_fds(int fds[], unsigned n_fds) {
100 int start, restart_from;
101
102 if (n_fds <= 0)
103 return 0;
104
105 /* Modifies the fds array! (sorts it) */
106
107 assert(fds);
108
109 start = 0;
110 for (;;) {
111 int i;
112
113 restart_from = -1;
114
115 for (i = start; i < (int) n_fds; i++) {
116 int nfd;
117
118 /* Already at right index? */
119 if (fds[i] == i+3)
120 continue;
121
122 if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
123 return -errno;
124
125 close_nointr_nofail(fds[i]);
126 fds[i] = nfd;
127
128 /* Hmm, the fd we wanted isn't free? Then
129 * let's remember that and try again from here*/
130 if (nfd != i+3 && restart_from < 0)
131 restart_from = i;
132 }
133
134 if (restart_from < 0)
135 break;
136
137 start = restart_from;
138 }
139
140 return 0;
141}
142
143static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) {
144 unsigned i;
145 int r;
146
147 if (n_fds <= 0)
148 return 0;
149
150 assert(fds);
151
152 /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
153
154 for (i = 0; i < n_fds; i++) {
155
156 if ((r = fd_nonblock(fds[i], nonblock)) < 0)
157 return r;
158
159 /* We unconditionally drop FD_CLOEXEC from the fds,
160 * since after all we want to pass these fds to our
161 * children */
162
163 if ((r = fd_cloexec(fds[i], false)) < 0)
164 return r;
165 }
166
167 return 0;
168}
169
170_pure_ static const char *tty_path(const ExecContext *context) {
171 assert(context);
172
173 if (context->tty_path)
174 return context->tty_path;
175
176 return "/dev/console";
177}
178
179static void exec_context_tty_reset(const ExecContext *context) {
180 assert(context);
181
182 if (context->tty_vhangup)
183 terminal_vhangup(tty_path(context));
184
185 if (context->tty_reset)
186 reset_terminal(tty_path(context));
187
188 if (context->tty_vt_disallocate && context->tty_path)
189 vt_disallocate(context->tty_path);
190}
191
192static bool is_terminal_output(ExecOutput o) {
193 return
194 o == EXEC_OUTPUT_TTY ||
195 o == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
196 o == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
197 o == EXEC_OUTPUT_JOURNAL_AND_CONSOLE;
198}
199
200static int open_null_as(int flags, int nfd) {
201 int fd, r;
202
203 assert(nfd >= 0);
204
205 fd = open("/dev/null", flags|O_NOCTTY);
206 if (fd < 0)
207 return -errno;
208
209 if (fd != nfd) {
210 r = dup2(fd, nfd) < 0 ? -errno : nfd;
211 close_nointr_nofail(fd);
212 } else
213 r = nfd;
214
215 return r;
216}
217
218static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, const char *unit_id, int nfd) {
219 int fd, r;
220 union sockaddr_union sa = {
221 .un.sun_family = AF_UNIX,
222 .un.sun_path = "/run/systemd/journal/stdout",
223 };
224
225 assert(context);
226 assert(output < _EXEC_OUTPUT_MAX);
227 assert(ident);
228 assert(nfd >= 0);
229
230 fd = socket(AF_UNIX, SOCK_STREAM, 0);
231 if (fd < 0)
232 return -errno;
233
234 r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
235 if (r < 0) {
236 close_nointr_nofail(fd);
237 return -errno;
238 }
239
240 if (shutdown(fd, SHUT_RD) < 0) {
241 close_nointr_nofail(fd);
242 return -errno;
243 }
244
245 fd_inc_sndbuf(fd, SNDBUF_SIZE);
246
247 dprintf(fd,
248 "%s\n"
249 "%s\n"
250 "%i\n"
251 "%i\n"
252 "%i\n"
253 "%i\n"
254 "%i\n",
255 context->syslog_identifier ? context->syslog_identifier : ident,
256 unit_id,
257 context->syslog_priority,
258 !!context->syslog_level_prefix,
259 output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE,
260 output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE,
261 is_terminal_output(output));
262
263 if (fd != nfd) {
264 r = dup2(fd, nfd) < 0 ? -errno : nfd;
265 close_nointr_nofail(fd);
266 } else
267 r = nfd;
268
269 return r;
270}
271static int open_terminal_as(const char *path, mode_t mode, int nfd) {
272 int fd, r;
273
274 assert(path);
275 assert(nfd >= 0);
276
277 if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
278 return fd;
279
280 if (fd != nfd) {
281 r = dup2(fd, nfd) < 0 ? -errno : nfd;
282 close_nointr_nofail(fd);
283 } else
284 r = nfd;
285
286 return r;
287}
288
289static bool is_terminal_input(ExecInput i) {
290 return
291 i == EXEC_INPUT_TTY ||
292 i == EXEC_INPUT_TTY_FORCE ||
293 i == EXEC_INPUT_TTY_FAIL;
294}
295
296static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) {
297
298 if (is_terminal_input(std_input) && !apply_tty_stdin)
299 return EXEC_INPUT_NULL;
300
301 if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
302 return EXEC_INPUT_NULL;
303
304 return std_input;
305}
306
307static int fixup_output(ExecOutput std_output, int socket_fd) {
308
309 if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
310 return EXEC_OUTPUT_INHERIT;
311
312 return std_output;
313}
314
315static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) {
316 ExecInput i;
317
318 assert(context);
319
320 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
321
322 switch (i) {
323
324 case EXEC_INPUT_NULL:
325 return open_null_as(O_RDONLY, STDIN_FILENO);
326
327 case EXEC_INPUT_TTY:
328 case EXEC_INPUT_TTY_FORCE:
329 case EXEC_INPUT_TTY_FAIL: {
330 int fd, r;
331
332 fd = acquire_terminal(tty_path(context),
333 i == EXEC_INPUT_TTY_FAIL,
334 i == EXEC_INPUT_TTY_FORCE,
335 false,
336 (usec_t) -1);
337 if (fd < 0)
338 return fd;
339
340 if (fd != STDIN_FILENO) {
341 r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
342 close_nointr_nofail(fd);
343 } else
344 r = STDIN_FILENO;
345
346 return r;
347 }
348
349 case EXEC_INPUT_SOCKET:
350 return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
351
352 default:
353 assert_not_reached("Unknown input type");
354 }
355}
356
357static int setup_output(const ExecContext *context, int fileno, int socket_fd, const char *ident, const char *unit_id, bool apply_tty_stdin) {
358 ExecOutput o;
359 ExecInput i;
360 int r;
361
362 assert(context);
363 assert(ident);
364
365 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
366 o = fixup_output(context->std_output, socket_fd);
367
368 if (fileno == STDERR_FILENO) {
369 ExecOutput e;
370 e = fixup_output(context->std_error, socket_fd);
371
372 /* This expects the input and output are already set up */
373
374 /* Don't change the stderr file descriptor if we inherit all
375 * the way and are not on a tty */
376 if (e == EXEC_OUTPUT_INHERIT &&
377 o == EXEC_OUTPUT_INHERIT &&
378 i == EXEC_INPUT_NULL &&
379 !is_terminal_input(context->std_input) &&
380 getppid () != 1)
381 return fileno;
382
383 /* Duplicate from stdout if possible */
384 if (e == o || e == EXEC_OUTPUT_INHERIT)
385 return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno;
386
387 o = e;
388
389 } else if (o == EXEC_OUTPUT_INHERIT) {
390 /* If input got downgraded, inherit the original value */
391 if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input))
392 return open_terminal_as(tty_path(context), O_WRONLY, fileno);
393
394 /* If the input is connected to anything that's not a /dev/null, inherit that... */
395 if (i != EXEC_INPUT_NULL)
396 return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
397
398 /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */
399 if (getppid() != 1)
400 return fileno;
401
402 /* We need to open /dev/null here anew, to get the right access mode. */
403 return open_null_as(O_WRONLY, fileno);
404 }
405
406 switch (o) {
407
408 case EXEC_OUTPUT_NULL:
409 return open_null_as(O_WRONLY, fileno);
410
411 case EXEC_OUTPUT_TTY:
412 if (is_terminal_input(i))
413 return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
414
415 /* We don't reset the terminal if this is just about output */
416 return open_terminal_as(tty_path(context), O_WRONLY, fileno);
417
418 case EXEC_OUTPUT_SYSLOG:
419 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
420 case EXEC_OUTPUT_KMSG:
421 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
422 case EXEC_OUTPUT_JOURNAL:
423 case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
424 r = connect_logger_as(context, o, ident, unit_id, fileno);
425 if (r < 0) {
426 log_struct_unit(LOG_CRIT, unit_id,
427 "MESSAGE=Failed to connect std%s of %s to the journal socket: %s",
428 fileno == STDOUT_FILENO ? "out" : "err",
429 unit_id, strerror(-r),
430 "ERRNO=%d", -r,
431 NULL);
432 r = open_null_as(O_WRONLY, fileno);
433 }
434 return r;
435
436 case EXEC_OUTPUT_SOCKET:
437 assert(socket_fd >= 0);
438 return dup2(socket_fd, fileno) < 0 ? -errno : fileno;
439
440 default:
441 assert_not_reached("Unknown error type");
442 }
443}
444
445static int chown_terminal(int fd, uid_t uid) {
446 struct stat st;
447
448 assert(fd >= 0);
449
450 /* This might fail. What matters are the results. */
451 (void) fchown(fd, uid, -1);
452 (void) fchmod(fd, TTY_MODE);
453
454 if (fstat(fd, &st) < 0)
455 return -errno;
456
457 if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
458 return -EPERM;
459
460 return 0;
461}
462
463static int setup_confirm_stdio(int *_saved_stdin,
464 int *_saved_stdout) {
465 int fd = -1, saved_stdin, saved_stdout = -1, r;
466
467 assert(_saved_stdin);
468 assert(_saved_stdout);
469
470 saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3);
471 if (saved_stdin < 0)
472 return -errno;
473
474 saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3);
475 if (saved_stdout < 0) {
476 r = errno;
477 goto fail;
478 }
479
480 fd = acquire_terminal(
481 "/dev/console",
482 false,
483 false,
484 false,
485 DEFAULT_CONFIRM_USEC);
486 if (fd < 0) {
487 r = fd;
488 goto fail;
489 }
490
491 r = chown_terminal(fd, getuid());
492 if (r < 0)
493 goto fail;
494
495 if (dup2(fd, STDIN_FILENO) < 0) {
496 r = -errno;
497 goto fail;
498 }
499
500 if (dup2(fd, STDOUT_FILENO) < 0) {
501 r = -errno;
502 goto fail;
503 }
504
505 if (fd >= 2)
506 close_nointr_nofail(fd);
507
508 *_saved_stdin = saved_stdin;
509 *_saved_stdout = saved_stdout;
510
511 return 0;
512
513fail:
514 if (saved_stdout >= 0)
515 close_nointr_nofail(saved_stdout);
516
517 if (saved_stdin >= 0)
518 close_nointr_nofail(saved_stdin);
519
520 if (fd >= 0)
521 close_nointr_nofail(fd);
522
523 return r;
524}
525
526_printf_(1, 2) static int write_confirm_message(const char *format, ...) {
527 int fd;
528 va_list ap;
529
530 assert(format);
531
532 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
533 if (fd < 0)
534 return fd;
535
536 va_start(ap, format);
537 vdprintf(fd, format, ap);
538 va_end(ap);
539
540 close_nointr_nofail(fd);
541
542 return 0;
543}
544
545static int restore_confirm_stdio(int *saved_stdin,
546 int *saved_stdout) {
547
548 int r = 0;
549
550 assert(saved_stdin);
551 assert(saved_stdout);
552
553 release_terminal();
554
555 if (*saved_stdin >= 0)
556 if (dup2(*saved_stdin, STDIN_FILENO) < 0)
557 r = -errno;
558
559 if (*saved_stdout >= 0)
560 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
561 r = -errno;
562
563 if (*saved_stdin >= 0)
564 close_nointr_nofail(*saved_stdin);
565
566 if (*saved_stdout >= 0)
567 close_nointr_nofail(*saved_stdout);
568
569 return r;
570}
571
572static int ask_for_confirmation(char *response, char **argv) {
573 int saved_stdout = -1, saved_stdin = -1, r;
574 char *line;
575
576 r = setup_confirm_stdio(&saved_stdin, &saved_stdout);
577 if (r < 0)
578 return r;
579
580 line = exec_command_line(argv);
581 if (!line)
582 return -ENOMEM;
583
584 r = ask(response, "yns", "Execute %s? [Yes, No, Skip] ", line);
585 free(line);
586
587 restore_confirm_stdio(&saved_stdin, &saved_stdout);
588
589 return r;
590}
591
592static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
593 bool keep_groups = false;
594 int r;
595
596 assert(context);
597
598 /* Lookup and set GID and supplementary group list. Here too
599 * we avoid NSS lookups for gid=0. */
600
601 if (context->group || username) {
602
603 if (context->group) {
604 const char *g = context->group;
605
606 if ((r = get_group_creds(&g, &gid)) < 0)
607 return r;
608 }
609
610 /* First step, initialize groups from /etc/groups */
611 if (username && gid != 0) {
612 if (initgroups(username, gid) < 0)
613 return -errno;
614
615 keep_groups = true;
616 }
617
618 /* Second step, set our gids */
619 if (setresgid(gid, gid, gid) < 0)
620 return -errno;
621 }
622
623 if (context->supplementary_groups) {
624 int ngroups_max, k;
625 gid_t *gids;
626 char **i;
627
628 /* Final step, initialize any manually set supplementary groups */
629 assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0);
630
631 if (!(gids = new(gid_t, ngroups_max)))
632 return -ENOMEM;
633
634 if (keep_groups) {
635 if ((k = getgroups(ngroups_max, gids)) < 0) {
636 free(gids);
637 return -errno;
638 }
639 } else
640 k = 0;
641
642 STRV_FOREACH(i, context->supplementary_groups) {
643 const char *g;
644
645 if (k >= ngroups_max) {
646 free(gids);
647 return -E2BIG;
648 }
649
650 g = *i;
651 r = get_group_creds(&g, gids+k);
652 if (r < 0) {
653 free(gids);
654 return r;
655 }
656
657 k++;
658 }
659
660 if (setgroups(k, gids) < 0) {
661 free(gids);
662 return -errno;
663 }
664
665 free(gids);
666 }
667
668 return 0;
669}
670
671static int enforce_user(const ExecContext *context, uid_t uid) {
672 assert(context);
673
674 /* Sets (but doesn't lookup) the uid and make sure we keep the
675 * capabilities while doing so. */
676
677 if (context->capabilities) {
678 _cleanup_cap_free_ cap_t d = NULL;
679 static const cap_value_t bits[] = {
680 CAP_SETUID, /* Necessary so that we can run setresuid() below */
681 CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */
682 };
683
684 /* First step: If we need to keep capabilities but
685 * drop privileges we need to make sure we keep our
686 * caps, while we drop privileges. */
687 if (uid != 0) {
688 int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS;
689
690 if (prctl(PR_GET_SECUREBITS) != sb)
691 if (prctl(PR_SET_SECUREBITS, sb) < 0)
692 return -errno;
693 }
694
695 /* Second step: set the capabilities. This will reduce
696 * the capabilities to the minimum we need. */
697
698 d = cap_dup(context->capabilities);
699 if (!d)
700 return -errno;
701
702 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
703 cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0)
704 return -errno;
705
706 if (cap_set_proc(d) < 0)
707 return -errno;
708 }
709
710 /* Third step: actually set the uids */
711 if (setresuid(uid, uid, uid) < 0)
712 return -errno;
713
714 /* At this point we should have all necessary capabilities but
715 are otherwise a normal user. However, the caps might got
716 corrupted due to the setresuid() so we need clean them up
717 later. This is done outside of this call. */
718
719 return 0;
720}
721
722#ifdef HAVE_PAM
723
724static int null_conv(
725 int num_msg,
726 const struct pam_message **msg,
727 struct pam_response **resp,
728 void *appdata_ptr) {
729
730 /* We don't support conversations */
731
732 return PAM_CONV_ERR;
733}
734
735static int setup_pam(
736 const char *name,
737 const char *user,
738 uid_t uid,
739 const char *tty,
740 char ***pam_env,
741 int fds[], unsigned n_fds) {
742
743 static const struct pam_conv conv = {
744 .conv = null_conv,
745 .appdata_ptr = NULL
746 };
747
748 pam_handle_t *handle = NULL;
749 sigset_t ss, old_ss;
750 int pam_code = PAM_SUCCESS;
751 int err;
752 char **e = NULL;
753 bool close_session = false;
754 pid_t pam_pid = 0, parent_pid;
755 int flags = 0;
756
757 assert(name);
758 assert(user);
759 assert(pam_env);
760
761 /* We set up PAM in the parent process, then fork. The child
762 * will then stay around until killed via PR_GET_PDEATHSIG or
763 * systemd via the cgroup logic. It will then remove the PAM
764 * session again. The parent process will exec() the actual
765 * daemon. We do things this way to ensure that the main PID
766 * of the daemon is the one we initially fork()ed. */
767
768 if (log_get_max_level() < LOG_PRI(LOG_DEBUG))
769 flags |= PAM_SILENT;
770
771 pam_code = pam_start(name, user, &conv, &handle);
772 if (pam_code != PAM_SUCCESS) {
773 handle = NULL;
774 goto fail;
775 }
776
777 if (tty) {
778 pam_code = pam_set_item(handle, PAM_TTY, tty);
779 if (pam_code != PAM_SUCCESS)
780 goto fail;
781 }
782
783 pam_code = pam_acct_mgmt(handle, flags);
784 if (pam_code != PAM_SUCCESS)
785 goto fail;
786
787 pam_code = pam_open_session(handle, flags);
788 if (pam_code != PAM_SUCCESS)
789 goto fail;
790
791 close_session = true;
792
793 e = pam_getenvlist(handle);
794 if (!e) {
795 pam_code = PAM_BUF_ERR;
796 goto fail;
797 }
798
799 /* Block SIGTERM, so that we know that it won't get lost in
800 * the child */
801 if (sigemptyset(&ss) < 0 ||
802 sigaddset(&ss, SIGTERM) < 0 ||
803 sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0)
804 goto fail;
805
806 parent_pid = getpid();
807
808 pam_pid = fork();
809 if (pam_pid < 0)
810 goto fail;
811
812 if (pam_pid == 0) {
813 int sig;
814 int r = EXIT_PAM;
815
816 /* The child's job is to reset the PAM session on
817 * termination */
818
819 /* This string must fit in 10 chars (i.e. the length
820 * of "/sbin/init"), to look pretty in /bin/ps */
821 rename_process("(sd-pam)");
822
823 /* Make sure we don't keep open the passed fds in this
824 child. We assume that otherwise only those fds are
825 open here that have been opened by PAM. */
826 close_many(fds, n_fds);
827
828 /* Drop privileges - we don't need any to pam_close_session
829 * and this will make PR_SET_PDEATHSIG work in most cases.
830 * If this fails, ignore the error - but expect sd-pam threads
831 * to fail to exit normally */
832 if (setresuid(uid, uid, uid) < 0)
833 log_error("Error: Failed to setresuid() in sd-pam: %s", strerror(-r));
834
835 /* Wait until our parent died. This will only work if
836 * the above setresuid() succeeds, otherwise the kernel
837 * will not allow unprivileged parents kill their privileged
838 * children this way. We rely on the control groups kill logic
839 * to do the rest for us. */
840 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
841 goto child_finish;
842
843 /* Check if our parent process might already have
844 * died? */
845 if (getppid() == parent_pid) {
846 for (;;) {
847 if (sigwait(&ss, &sig) < 0) {
848 if (errno == EINTR)
849 continue;
850
851 goto child_finish;
852 }
853
854 assert(sig == SIGTERM);
855 break;
856 }
857 }
858
859 /* If our parent died we'll end the session */
860 if (getppid() != parent_pid) {
861 pam_code = pam_close_session(handle, flags);
862 if (pam_code != PAM_SUCCESS)
863 goto child_finish;
864 }
865
866 r = 0;
867
868 child_finish:
869 pam_end(handle, pam_code | flags);
870 _exit(r);
871 }
872
873 /* If the child was forked off successfully it will do all the
874 * cleanups, so forget about the handle here. */
875 handle = NULL;
876
877 /* Unblock SIGTERM again in the parent */
878 if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0)
879 goto fail;
880
881 /* We close the log explicitly here, since the PAM modules
882 * might have opened it, but we don't want this fd around. */
883 closelog();
884
885 *pam_env = e;
886 e = NULL;
887
888 return 0;
889
890fail:
891 if (pam_code != PAM_SUCCESS) {
892 log_error("PAM failed: %s", pam_strerror(handle, pam_code));
893 err = -EPERM; /* PAM errors do not map to errno */
894 } else {
895 log_error("PAM failed: %m");
896 err = -errno;
897 }
898
899 if (handle) {
900 if (close_session)
901 pam_code = pam_close_session(handle, flags);
902
903 pam_end(handle, pam_code | flags);
904 }
905
906 strv_free(e);
907
908 closelog();
909
910 if (pam_pid > 1) {
911 kill(pam_pid, SIGTERM);
912 kill(pam_pid, SIGCONT);
913 }
914
915 return err;
916}
917#endif
918
919static void rename_process_from_path(const char *path) {
920 char process_name[11];
921 const char *p;
922 size_t l;
923
924 /* This resulting string must fit in 10 chars (i.e. the length
925 * of "/sbin/init") to look pretty in /bin/ps */
926
927 p = basename(path);
928 if (isempty(p)) {
929 rename_process("(...)");
930 return;
931 }
932
933 l = strlen(p);
934 if (l > 8) {
935 /* The end of the process name is usually more
936 * interesting, since the first bit might just be
937 * "systemd-" */
938 p = p + l - 8;
939 l = 8;
940 }
941
942 process_name[0] = '(';
943 memcpy(process_name+1, p, l);
944 process_name[1+l] = ')';
945 process_name[1+l+1] = 0;
946
947 rename_process(process_name);
948}
949
950#ifdef HAVE_SECCOMP
951
952static int apply_seccomp(ExecContext *c) {
953 uint32_t negative_action, action;
954 scmp_filter_ctx *seccomp;
955 Iterator i;
956 void *id;
957 int r;
958
959 assert(c);
960
961 negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno);
962
963 seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW);
964 if (!seccomp)
965 return -ENOMEM;
966
967 if (c->syscall_archs) {
968
969 SET_FOREACH(id, c->syscall_archs, i) {
970 r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1);
971 if (r == -EEXIST)
972 continue;
973 if (r < 0)
974 goto finish;
975 }
976
977 } else {
978 r = seccomp_add_secondary_archs(seccomp);
979 if (r < 0)
980 goto finish;
981 }
982
983 action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action;
984 SET_FOREACH(id, c->syscall_filter, i) {
985 r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0);
986 if (r < 0)
987 goto finish;
988 }
989
990 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
991 if (r < 0)
992 goto finish;
993
994 r = seccomp_load(seccomp);
995
996finish:
997 seccomp_release(seccomp);
998 return r;
999}
1000
1001static int apply_address_families(ExecContext *c) {
1002 scmp_filter_ctx *seccomp;
1003 Iterator i;
1004 int r;
1005
1006 assert(c);
1007
1008 seccomp = seccomp_init(SCMP_ACT_ALLOW);
1009 if (!seccomp)
1010 return -ENOMEM;
1011
1012 r = seccomp_add_secondary_archs(seccomp);
1013 if (r < 0)
1014 goto finish;
1015
1016 if (c->address_families_whitelist) {
1017 int af, first = 0, last = 0;
1018 void *afp;
1019
1020 /* If this is a whitelist, we first block the address
1021 * families that are out of range and then everything
1022 * that is not in the set. First, we find the lowest
1023 * and highest address family in the set. */
1024
1025 SET_FOREACH(afp, c->address_families, i) {
1026 af = PTR_TO_INT(afp);
1027
1028 if (af <= 0 || af >= af_max())
1029 continue;
1030
1031 if (first == 0 || af < first)
1032 first = af;
1033
1034 if (last == 0 || af > last)
1035 last = af;
1036 }
1037
1038 assert((first == 0) == (last == 0));
1039
1040 if (first == 0) {
1041
1042 /* No entries in the valid range, block everything */
1043 r = seccomp_rule_add(
1044 seccomp,
1045 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1046 SCMP_SYS(socket),
1047 0);
1048 if (r < 0)
1049 goto finish;
1050
1051 } else {
1052
1053 /* Block everything below the first entry */
1054 r = seccomp_rule_add(
1055 seccomp,
1056 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1057 SCMP_SYS(socket),
1058 1,
1059 SCMP_A0(SCMP_CMP_LT, first));
1060 if (r < 0)
1061 goto finish;
1062
1063 /* Block everything above the last entry */
1064 r = seccomp_rule_add(
1065 seccomp,
1066 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1067 SCMP_SYS(socket),
1068 1,
1069 SCMP_A0(SCMP_CMP_GT, last));
1070 if (r < 0)
1071 goto finish;
1072
1073 /* Block everything between the first and last
1074 * entry */
1075 for (af = 1; af < af_max(); af++) {
1076
1077 if (set_contains(c->address_families, INT_TO_PTR(af)))
1078 continue;
1079
1080 r = seccomp_rule_add(
1081 seccomp,
1082 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1083 SCMP_SYS(socket),
1084 1,
1085 SCMP_A0(SCMP_CMP_EQ, af));
1086 if (r < 0)
1087 goto finish;
1088 }
1089 }
1090
1091 } else {
1092 void *af;
1093
1094 /* If this is a blacklist, then generate one rule for
1095 * each address family that are then combined in OR
1096 * checks. */
1097
1098 SET_FOREACH(af, c->address_families, i) {
1099
1100 r = seccomp_rule_add(
1101 seccomp,
1102 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1103 SCMP_SYS(socket),
1104 1,
1105 SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af)));
1106 if (r < 0)
1107 goto finish;
1108 }
1109 }
1110
1111 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
1112 if (r < 0)
1113 goto finish;
1114
1115 r = seccomp_load(seccomp);
1116
1117finish:
1118 seccomp_release(seccomp);
1119 return r;
1120}
1121
1122#endif
1123
1124static void do_idle_pipe_dance(int idle_pipe[4]) {
1125 assert(idle_pipe);
1126
1127 if (idle_pipe[1] >= 0)
1128 close_nointr_nofail(idle_pipe[1]);
1129 if (idle_pipe[2] >= 0)
1130 close_nointr_nofail(idle_pipe[2]);
1131
1132 if (idle_pipe[0] >= 0) {
1133 int r;
1134
1135 r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC);
1136
1137 if (idle_pipe[3] >= 0 && r == 0 /* timeout */) {
1138 /* Signal systemd that we are bored and want to continue. */
1139 write(idle_pipe[3], "x", 1);
1140
1141 /* Wait for systemd to react to the signal above. */
1142 fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC);
1143 }
1144
1145 close_nointr_nofail(idle_pipe[0]);
1146
1147 }
1148
1149 if (idle_pipe[3] >= 0)
1150 close_nointr_nofail(idle_pipe[3]);
1151}
1152
1153static int build_environment(
1154 ExecContext *c,
1155 unsigned n_fds,
1156 usec_t watchdog_usec,
1157 const char *home,
1158 const char *username,
1159 const char *shell,
1160 char ***ret) {
1161
1162 _cleanup_strv_free_ char **our_env = NULL;
1163 unsigned n_env = 0;
1164 char *x;
1165
1166 assert(c);
1167 assert(ret);
1168
1169 our_env = new0(char*, 10);
1170 if (!our_env)
1171 return -ENOMEM;
1172
1173 if (n_fds > 0) {
1174 if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0)
1175 return -ENOMEM;
1176 our_env[n_env++] = x;
1177
1178 if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0)
1179 return -ENOMEM;
1180 our_env[n_env++] = x;
1181 }
1182
1183 if (watchdog_usec > 0) {
1184 if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0)
1185 return -ENOMEM;
1186 our_env[n_env++] = x;
1187
1188 if (asprintf(&x, "WATCHDOG_USEC=%llu", (unsigned long long) watchdog_usec) < 0)
1189 return -ENOMEM;
1190 our_env[n_env++] = x;
1191 }
1192
1193 if (home) {
1194 x = strappend("HOME=", home);
1195 if (!x)
1196 return -ENOMEM;
1197 our_env[n_env++] = x;
1198 }
1199
1200 if (username) {
1201 x = strappend("LOGNAME=", username);
1202 if (!x)
1203 return -ENOMEM;
1204 our_env[n_env++] = x;
1205
1206 x = strappend("USER=", username);
1207 if (!x)
1208 return -ENOMEM;
1209 our_env[n_env++] = x;
1210 }
1211
1212 if (shell) {
1213 x = strappend("SHELL=", shell);
1214 if (!x)
1215 return -ENOMEM;
1216 our_env[n_env++] = x;
1217 }
1218
1219 if (is_terminal_input(c->std_input) ||
1220 c->std_output == EXEC_OUTPUT_TTY ||
1221 c->std_error == EXEC_OUTPUT_TTY ||
1222 c->tty_path) {
1223
1224 x = strdup(default_term_for_tty(tty_path(c)));
1225 if (!x)
1226 return -ENOMEM;
1227 our_env[n_env++] = x;
1228 }
1229
1230 our_env[n_env++] = NULL;
1231 assert(n_env <= 10);
1232
1233 *ret = our_env;
1234 our_env = NULL;
1235
1236 return 0;
1237}
1238
1239int exec_spawn(ExecCommand *command,
1240 char **argv,
1241 ExecContext *context,
1242 int fds[], unsigned n_fds,
1243 char **environment,
1244 bool apply_permissions,
1245 bool apply_chroot,
1246 bool apply_tty_stdin,
1247 bool confirm_spawn,
1248 CGroupControllerMask cgroup_supported,
1249 const char *cgroup_path,
1250 const char *unit_id,
1251 usec_t watchdog_usec,
1252 int idle_pipe[4],
1253 ExecRuntime *runtime,
1254 pid_t *ret) {
1255
1256 _cleanup_strv_free_ char **files_env = NULL;
1257 int socket_fd;
1258 char *line;
1259 pid_t pid;
1260 int r;
1261
1262 assert(command);
1263 assert(context);
1264 assert(ret);
1265 assert(fds || n_fds <= 0);
1266
1267 if (context->std_input == EXEC_INPUT_SOCKET ||
1268 context->std_output == EXEC_OUTPUT_SOCKET ||
1269 context->std_error == EXEC_OUTPUT_SOCKET) {
1270
1271 if (n_fds != 1)
1272 return -EINVAL;
1273
1274 socket_fd = fds[0];
1275
1276 fds = NULL;
1277 n_fds = 0;
1278 } else
1279 socket_fd = -1;
1280
1281 r = exec_context_load_environment(context, &files_env);
1282 if (r < 0) {
1283 log_struct_unit(LOG_ERR,
1284 unit_id,
1285 "MESSAGE=Failed to load environment files: %s", strerror(-r),
1286 "ERRNO=%d", -r,
1287 NULL);
1288 return r;
1289 }
1290
1291 if (!argv)
1292 argv = command->argv;
1293
1294 line = exec_command_line(argv);
1295 if (!line)
1296 return log_oom();
1297
1298 log_struct_unit(LOG_DEBUG,
1299 unit_id,
1300 "EXECUTABLE=%s", command->path,
1301 "MESSAGE=About to execute: %s", line,
1302 NULL);
1303 free(line);
1304
1305 pid = fork();
1306 if (pid < 0)
1307 return -errno;
1308
1309 if (pid == 0) {
1310 _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
1311 const char *username = NULL, *home = NULL, *shell = NULL;
1312 unsigned n_dont_close = 0;
1313 int dont_close[n_fds + 3];
1314 uid_t uid = (uid_t) -1;
1315 gid_t gid = (gid_t) -1;
1316 sigset_t ss;
1317 int i, err;
1318
1319 /* child */
1320
1321 rename_process_from_path(command->path);
1322
1323 /* We reset exactly these signals, since they are the
1324 * only ones we set to SIG_IGN in the main daemon. All
1325 * others we leave untouched because we set them to
1326 * SIG_DFL or a valid handler initially, both of which
1327 * will be demoted to SIG_DFL. */
1328 default_signals(SIGNALS_CRASH_HANDLER,
1329 SIGNALS_IGNORE, -1);
1330
1331 if (context->ignore_sigpipe)
1332 ignore_signals(SIGPIPE, -1);
1333
1334 assert_se(sigemptyset(&ss) == 0);
1335 if (sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
1336 err = -errno;
1337 r = EXIT_SIGNAL_MASK;
1338 goto fail_child;
1339 }
1340
1341 if (idle_pipe)
1342 do_idle_pipe_dance(idle_pipe);
1343
1344 /* Close sockets very early to make sure we don't
1345 * block init reexecution because it cannot bind its
1346 * sockets */
1347 log_forget_fds();
1348
1349 if (socket_fd >= 0)
1350 dont_close[n_dont_close++] = socket_fd;
1351 if (n_fds > 0) {
1352 memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds);
1353 n_dont_close += n_fds;
1354 }
1355 if (runtime) {
1356 if (runtime->netns_storage_socket[0] >= 0)
1357 dont_close[n_dont_close++] = runtime->netns_storage_socket[0];
1358 if (runtime->netns_storage_socket[1] >= 0)
1359 dont_close[n_dont_close++] = runtime->netns_storage_socket[1];
1360 }
1361
1362 err = close_all_fds(dont_close, n_dont_close);
1363 if (err < 0) {
1364 r = EXIT_FDS;
1365 goto fail_child;
1366 }
1367
1368 if (!context->same_pgrp)
1369 if (setsid() < 0) {
1370 err = -errno;
1371 r = EXIT_SETSID;
1372 goto fail_child;
1373 }
1374
1375 if (context->tcpwrap_name) {
1376 if (socket_fd >= 0)
1377 if (!socket_tcpwrap(socket_fd, context->tcpwrap_name)) {
1378 err = -EACCES;
1379 r = EXIT_TCPWRAP;
1380 goto fail_child;
1381 }
1382
1383 for (i = 0; i < (int) n_fds; i++) {
1384 if (!socket_tcpwrap(fds[i], context->tcpwrap_name)) {
1385 err = -EACCES;
1386 r = EXIT_TCPWRAP;
1387 goto fail_child;
1388 }
1389 }
1390 }
1391
1392 exec_context_tty_reset(context);
1393
1394 if (confirm_spawn) {
1395 char response;
1396
1397 err = ask_for_confirmation(&response, argv);
1398 if (err == -ETIMEDOUT)
1399 write_confirm_message("Confirmation question timed out, assuming positive response.\n");
1400 else if (err < 0)
1401 write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-err));
1402 else if (response == 's') {
1403 write_confirm_message("Skipping execution.\n");
1404 err = -ECANCELED;
1405 r = EXIT_CONFIRM;
1406 goto fail_child;
1407 } else if (response == 'n') {
1408 write_confirm_message("Failing execution.\n");
1409 err = r = 0;
1410 goto fail_child;
1411 }
1412 }
1413
1414 /* If a socket is connected to STDIN/STDOUT/STDERR, we
1415 * must sure to drop O_NONBLOCK */
1416 if (socket_fd >= 0)
1417 fd_nonblock(socket_fd, false);
1418
1419 err = setup_input(context, socket_fd, apply_tty_stdin);
1420 if (err < 0) {
1421 r = EXIT_STDIN;
1422 goto fail_child;
1423 }
1424
1425 err = setup_output(context, STDOUT_FILENO, socket_fd, basename(command->path), unit_id, apply_tty_stdin);
1426 if (err < 0) {
1427 r = EXIT_STDOUT;
1428 goto fail_child;
1429 }
1430
1431 err = setup_output(context, STDERR_FILENO, socket_fd, basename(command->path), unit_id, apply_tty_stdin);
1432 if (err < 0) {
1433 r = EXIT_STDERR;
1434 goto fail_child;
1435 }
1436
1437 if (cgroup_path) {
1438 err = cg_attach_everywhere(cgroup_supported, cgroup_path, 0);
1439 if (err < 0) {
1440 r = EXIT_CGROUP;
1441 goto fail_child;
1442 }
1443 }
1444
1445 if (context->oom_score_adjust_set) {
1446 char t[16];
1447
1448 snprintf(t, sizeof(t), "%i", context->oom_score_adjust);
1449 char_array_0(t);
1450
1451 if (write_string_file("/proc/self/oom_score_adj", t) < 0) {
1452 err = -errno;
1453 r = EXIT_OOM_ADJUST;
1454 goto fail_child;
1455 }
1456 }
1457
1458 if (context->nice_set)
1459 if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
1460 err = -errno;
1461 r = EXIT_NICE;
1462 goto fail_child;
1463 }
1464
1465 if (context->cpu_sched_set) {
1466 struct sched_param param = {
1467 .sched_priority = context->cpu_sched_priority,
1468 };
1469
1470 r = sched_setscheduler(0,
1471 context->cpu_sched_policy |
1472 (context->cpu_sched_reset_on_fork ?
1473 SCHED_RESET_ON_FORK : 0),
1474 &param);
1475 if (r < 0) {
1476 err = -errno;
1477 r = EXIT_SETSCHEDULER;
1478 goto fail_child;
1479 }
1480 }
1481
1482 if (context->cpuset)
1483 if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
1484 err = -errno;
1485 r = EXIT_CPUAFFINITY;
1486 goto fail_child;
1487 }
1488
1489 if (context->ioprio_set)
1490 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
1491 err = -errno;
1492 r = EXIT_IOPRIO;
1493 goto fail_child;
1494 }
1495
1496 if (context->timer_slack_nsec != (nsec_t) -1)
1497 if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
1498 err = -errno;
1499 r = EXIT_TIMERSLACK;
1500 goto fail_child;
1501 }
1502
1503 if (context->personality != 0xffffffffUL)
1504 if (personality(context->personality) < 0) {
1505 err = -errno;
1506 r = EXIT_PERSONALITY;
1507 goto fail_child;
1508 }
1509
1510 if (context->utmp_id)
1511 utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path);
1512
1513 if (context->user) {
1514 username = context->user;
1515 err = get_user_creds(&username, &uid, &gid, &home, &shell);
1516 if (err < 0) {
1517 r = EXIT_USER;
1518 goto fail_child;
1519 }
1520
1521 if (is_terminal_input(context->std_input)) {
1522 err = chown_terminal(STDIN_FILENO, uid);
1523 if (err < 0) {
1524 r = EXIT_STDIN;
1525 goto fail_child;
1526 }
1527 }
1528 }
1529
1530#ifdef HAVE_PAM
1531 if (cgroup_path && context->user && context->pam_name) {
1532 err = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, 0644, uid, gid);
1533 if (err < 0) {
1534 r = EXIT_CGROUP;
1535 goto fail_child;
1536 }
1537
1538
1539 err = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, 0755, uid, gid);
1540 if (err < 0) {
1541 r = EXIT_CGROUP;
1542 goto fail_child;
1543 }
1544 }
1545#endif
1546
1547 if (apply_permissions) {
1548 err = enforce_groups(context, username, gid);
1549 if (err < 0) {
1550 r = EXIT_GROUP;
1551 goto fail_child;
1552 }
1553 }
1554
1555 umask(context->umask);
1556
1557#ifdef HAVE_PAM
1558 if (apply_permissions && context->pam_name && username) {
1559 err = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds);
1560 if (err < 0) {
1561 r = EXIT_PAM;
1562 goto fail_child;
1563 }
1564 }
1565#endif
1566 if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) {
1567 err = setup_netns(runtime->netns_storage_socket);
1568 if (err < 0) {
1569 r = EXIT_NETWORK;
1570 goto fail_child;
1571 }
1572 }
1573
1574 if (!strv_isempty(context->read_write_dirs) ||
1575 !strv_isempty(context->read_only_dirs) ||
1576 !strv_isempty(context->inaccessible_dirs) ||
1577 context->mount_flags != 0 ||
1578 (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) ||
1579 context->private_devices) {
1580
1581 char *tmp = NULL, *var = NULL;
1582
1583 /* The runtime struct only contains the parent
1584 * of the private /tmp, which is
1585 * non-accessible to world users. Inside of it
1586 * there's a /tmp that is sticky, and that's
1587 * the one we want to use here. */
1588
1589 if (context->private_tmp && runtime) {
1590 if (runtime->tmp_dir)
1591 tmp = strappenda(runtime->tmp_dir, "/tmp");
1592 if (runtime->var_tmp_dir)
1593 var = strappenda(runtime->var_tmp_dir, "/tmp");
1594 }
1595
1596 err = setup_namespace(
1597 context->read_write_dirs,
1598 context->read_only_dirs,
1599 context->inaccessible_dirs,
1600 tmp,
1601 var,
1602 context->private_devices,
1603 context->mount_flags);
1604
1605 if (err < 0) {
1606 r = EXIT_NAMESPACE;
1607 goto fail_child;
1608 }
1609 }
1610
1611 if (apply_chroot) {
1612 if (context->root_directory)
1613 if (chroot(context->root_directory) < 0) {
1614 err = -errno;
1615 r = EXIT_CHROOT;
1616 goto fail_child;
1617 }
1618
1619 if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
1620 err = -errno;
1621 r = EXIT_CHDIR;
1622 goto fail_child;
1623 }
1624 } else {
1625 _cleanup_free_ char *d = NULL;
1626
1627 if (asprintf(&d, "%s/%s",
1628 context->root_directory ? context->root_directory : "",
1629 context->working_directory ? context->working_directory : "") < 0) {
1630 err = -ENOMEM;
1631 r = EXIT_MEMORY;
1632 goto fail_child;
1633 }
1634
1635 if (chdir(d) < 0) {
1636 err = -errno;
1637 r = EXIT_CHDIR;
1638 goto fail_child;
1639 }
1640 }
1641
1642 /* We repeat the fd closing here, to make sure that
1643 * nothing is leaked from the PAM modules */
1644 err = close_all_fds(fds, n_fds);
1645 if (err >= 0)
1646 err = shift_fds(fds, n_fds);
1647 if (err >= 0)
1648 err = flags_fds(fds, n_fds, context->non_blocking);
1649 if (err < 0) {
1650 r = EXIT_FDS;
1651 goto fail_child;
1652 }
1653
1654 if (apply_permissions) {
1655
1656 for (i = 0; i < RLIMIT_NLIMITS; i++) {
1657 if (!context->rlimit[i])
1658 continue;
1659
1660 if (setrlimit_closest(i, context->rlimit[i]) < 0) {
1661 err = -errno;
1662 r = EXIT_LIMITS;
1663 goto fail_child;
1664 }
1665 }
1666
1667 if (context->capability_bounding_set_drop) {
1668 err = capability_bounding_set_drop(context->capability_bounding_set_drop, false);
1669 if (err < 0) {
1670 r = EXIT_CAPABILITIES;
1671 goto fail_child;
1672 }
1673 }
1674
1675 if (context->user) {
1676 err = enforce_user(context, uid);
1677 if (err < 0) {
1678 r = EXIT_USER;
1679 goto fail_child;
1680 }
1681 }
1682
1683 /* PR_GET_SECUREBITS is not privileged, while
1684 * PR_SET_SECUREBITS is. So to suppress
1685 * potential EPERMs we'll try not to call
1686 * PR_SET_SECUREBITS unless necessary. */
1687 if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
1688 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
1689 err = -errno;
1690 r = EXIT_SECUREBITS;
1691 goto fail_child;
1692 }
1693
1694 if (context->capabilities)
1695 if (cap_set_proc(context->capabilities) < 0) {
1696 err = -errno;
1697 r = EXIT_CAPABILITIES;
1698 goto fail_child;
1699 }
1700
1701 if (context->no_new_privileges)
1702 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
1703 err = -errno;
1704 r = EXIT_NO_NEW_PRIVILEGES;
1705 goto fail_child;
1706 }
1707
1708#ifdef HAVE_SECCOMP
1709 if (context->address_families_whitelist ||
1710 !set_isempty(context->address_families)) {
1711 err = apply_address_families(context);
1712 if (err < 0) {
1713 r = EXIT_ADDRESS_FAMILIES;
1714 goto fail_child;
1715 }
1716 }
1717
1718 if (context->syscall_whitelist ||
1719 !set_isempty(context->syscall_filter) ||
1720 !set_isempty(context->syscall_archs)) {
1721 err = apply_seccomp(context);
1722 if (err < 0) {
1723 r = EXIT_SECCOMP;
1724 goto fail_child;
1725 }
1726 }
1727#endif
1728
1729#ifdef HAVE_SELINUX
1730 if (context->selinux_context && use_selinux()) {
1731 err = setexeccon(context->selinux_context);
1732 if (err < 0 && !context->selinux_context_ignore) {
1733 r = EXIT_SELINUX_CONTEXT;
1734 goto fail_child;
1735 }
1736 }
1737#endif
1738
1739#ifdef HAVE_APPARMOR
1740 if (context->apparmor_profile && use_apparmor()) {
1741 err = aa_change_onexec(context->apparmor_profile);
1742 if (err < 0 && !context->apparmor_profile_ignore) {
1743 r = EXIT_APPARMOR_PROFILE;
1744 goto fail_child;
1745 }
1746 }
1747#endif
1748 }
1749
1750 err = build_environment(context, n_fds, watchdog_usec, home, username, shell, &our_env);
1751 if (r < 0) {
1752 r = EXIT_MEMORY;
1753 goto fail_child;
1754 }
1755
1756 final_env = strv_env_merge(5,
1757 environment,
1758 our_env,
1759 context->environment,
1760 files_env,
1761 pam_env,
1762 NULL);
1763 if (!final_env) {
1764 err = -ENOMEM;
1765 r = EXIT_MEMORY;
1766 goto fail_child;
1767 }
1768
1769 final_argv = replace_env_argv(argv, final_env);
1770 if (!final_argv) {
1771 err = -ENOMEM;
1772 r = EXIT_MEMORY;
1773 goto fail_child;
1774 }
1775
1776 final_env = strv_env_clean(final_env);
1777
1778 if (_unlikely_(log_get_max_level() >= LOG_PRI(LOG_DEBUG))) {
1779 line = exec_command_line(final_argv);
1780 if (line) {
1781 log_open();
1782 log_struct_unit(LOG_DEBUG,
1783 unit_id,
1784 "EXECUTABLE=%s", command->path,
1785 "MESSAGE=Executing: %s", line,
1786 NULL);
1787 log_close();
1788 free(line);
1789 line = NULL;
1790 }
1791 }
1792 execve(command->path, final_argv, final_env);
1793 err = -errno;
1794 r = EXIT_EXEC;
1795
1796 fail_child:
1797 if (r != 0) {
1798 log_open();
1799 log_struct(LOG_ERR, MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED),
1800 "EXECUTABLE=%s", command->path,
1801 "MESSAGE=Failed at step %s spawning %s: %s",
1802 exit_status_to_string(r, EXIT_STATUS_SYSTEMD),
1803 command->path, strerror(-err),
1804 "ERRNO=%d", -err,
1805 NULL);
1806 log_close();
1807 }
1808
1809 _exit(r);
1810 }
1811
1812 log_struct_unit(LOG_DEBUG,
1813 unit_id,
1814 "MESSAGE=Forked %s as "PID_FMT,
1815 command->path, pid,
1816 NULL);
1817
1818 /* We add the new process to the cgroup both in the child (so
1819 * that we can be sure that no user code is ever executed
1820 * outside of the cgroup) and in the parent (so that we can be
1821 * sure that when we kill the cgroup the process will be
1822 * killed too). */
1823 if (cgroup_path)
1824 cg_attach(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, pid);
1825
1826 exec_status_start(&command->exec_status, pid);
1827
1828 *ret = pid;
1829 return 0;
1830}
1831
1832void exec_context_init(ExecContext *c) {
1833 assert(c);
1834
1835 c->umask = 0022;
1836 c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
1837 c->cpu_sched_policy = SCHED_OTHER;
1838 c->syslog_priority = LOG_DAEMON|LOG_INFO;
1839 c->syslog_level_prefix = true;
1840 c->ignore_sigpipe = true;
1841 c->timer_slack_nsec = (nsec_t) -1;
1842 c->personality = 0xffffffffUL;
1843}
1844
1845void exec_context_done(ExecContext *c) {
1846 unsigned l;
1847
1848 assert(c);
1849
1850 strv_free(c->environment);
1851 c->environment = NULL;
1852
1853 strv_free(c->environment_files);
1854 c->environment_files = NULL;
1855
1856 for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
1857 free(c->rlimit[l]);
1858 c->rlimit[l] = NULL;
1859 }
1860
1861 free(c->working_directory);
1862 c->working_directory = NULL;
1863 free(c->root_directory);
1864 c->root_directory = NULL;
1865
1866 free(c->tty_path);
1867 c->tty_path = NULL;
1868
1869 free(c->tcpwrap_name);
1870 c->tcpwrap_name = NULL;
1871
1872 free(c->syslog_identifier);
1873 c->syslog_identifier = NULL;
1874
1875 free(c->user);
1876 c->user = NULL;
1877
1878 free(c->group);
1879 c->group = NULL;
1880
1881 strv_free(c->supplementary_groups);
1882 c->supplementary_groups = NULL;
1883
1884 free(c->pam_name);
1885 c->pam_name = NULL;
1886
1887 if (c->capabilities) {
1888 cap_free(c->capabilities);
1889 c->capabilities = NULL;
1890 }
1891
1892 strv_free(c->read_only_dirs);
1893 c->read_only_dirs = NULL;
1894
1895 strv_free(c->read_write_dirs);
1896 c->read_write_dirs = NULL;
1897
1898 strv_free(c->inaccessible_dirs);
1899 c->inaccessible_dirs = NULL;
1900
1901 if (c->cpuset)
1902 CPU_FREE(c->cpuset);
1903
1904 free(c->utmp_id);
1905 c->utmp_id = NULL;
1906
1907 free(c->selinux_context);
1908 c->selinux_context = NULL;
1909
1910 free(c->apparmor_profile);
1911 c->apparmor_profile = NULL;
1912
1913 set_free(c->syscall_filter);
1914 c->syscall_filter = NULL;
1915
1916 set_free(c->syscall_archs);
1917 c->syscall_archs = NULL;
1918
1919 set_free(c->address_families);
1920 c->address_families = NULL;
1921}
1922
1923void exec_command_done(ExecCommand *c) {
1924 assert(c);
1925
1926 free(c->path);
1927 c->path = NULL;
1928
1929 strv_free(c->argv);
1930 c->argv = NULL;
1931}
1932
1933void exec_command_done_array(ExecCommand *c, unsigned n) {
1934 unsigned i;
1935
1936 for (i = 0; i < n; i++)
1937 exec_command_done(c+i);
1938}
1939
1940void exec_command_free_list(ExecCommand *c) {
1941 ExecCommand *i;
1942
1943 while ((i = c)) {
1944 LIST_REMOVE(command, c, i);
1945 exec_command_done(i);
1946 free(i);
1947 }
1948}
1949
1950void exec_command_free_array(ExecCommand **c, unsigned n) {
1951 unsigned i;
1952
1953 for (i = 0; i < n; i++) {
1954 exec_command_free_list(c[i]);
1955 c[i] = NULL;
1956 }
1957}
1958
1959int exec_context_load_environment(const ExecContext *c, char ***l) {
1960 char **i, **r = NULL;
1961
1962 assert(c);
1963 assert(l);
1964
1965 STRV_FOREACH(i, c->environment_files) {
1966 char *fn;
1967 int k;
1968 bool ignore = false;
1969 char **p;
1970 _cleanup_globfree_ glob_t pglob = {};
1971 int count, n;
1972
1973 fn = *i;
1974
1975 if (fn[0] == '-') {
1976 ignore = true;
1977 fn ++;
1978 }
1979
1980 if (!path_is_absolute(fn)) {
1981 if (ignore)
1982 continue;
1983
1984 strv_free(r);
1985 return -EINVAL;
1986 }
1987
1988 /* Filename supports globbing, take all matching files */
1989 errno = 0;
1990 if (glob(fn, 0, NULL, &pglob) != 0) {
1991 if (ignore)
1992 continue;
1993
1994 strv_free(r);
1995 return errno ? -errno : -EINVAL;
1996 }
1997 count = pglob.gl_pathc;
1998 if (count == 0) {
1999 if (ignore)
2000 continue;
2001
2002 strv_free(r);
2003 return -EINVAL;
2004 }
2005 for (n = 0; n < count; n++) {
2006 k = load_env_file(pglob.gl_pathv[n], NULL, &p);
2007 if (k < 0) {
2008 if (ignore)
2009 continue;
2010
2011 strv_free(r);
2012 return k;
2013 }
2014 /* Log invalid environment variables with filename */
2015 if (p)
2016 p = strv_env_clean_log(p, pglob.gl_pathv[n]);
2017
2018 if (r == NULL)
2019 r = p;
2020 else {
2021 char **m;
2022
2023 m = strv_env_merge(2, r, p);
2024 strv_free(r);
2025 strv_free(p);
2026 if (!m)
2027 return -ENOMEM;
2028
2029 r = m;
2030 }
2031 }
2032 }
2033
2034 *l = r;
2035
2036 return 0;
2037}
2038
2039static bool tty_may_match_dev_console(const char *tty) {
2040 char *active = NULL, *console;
2041 bool b;
2042
2043 if (startswith(tty, "/dev/"))
2044 tty += 5;
2045
2046 /* trivial identity? */
2047 if (streq(tty, "console"))
2048 return true;
2049
2050 console = resolve_dev_console(&active);
2051 /* if we could not resolve, assume it may */
2052 if (!console)
2053 return true;
2054
2055 /* "tty0" means the active VC, so it may be the same sometimes */
2056 b = streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty));
2057 free(active);
2058
2059 return b;
2060}
2061
2062bool exec_context_may_touch_console(ExecContext *ec) {
2063 return (ec->tty_reset || ec->tty_vhangup || ec->tty_vt_disallocate ||
2064 is_terminal_input(ec->std_input) ||
2065 is_terminal_output(ec->std_output) ||
2066 is_terminal_output(ec->std_error)) &&
2067 tty_may_match_dev_console(tty_path(ec));
2068}
2069
2070static void strv_fprintf(FILE *f, char **l) {
2071 char **g;
2072
2073 assert(f);
2074
2075 STRV_FOREACH(g, l)
2076 fprintf(f, " %s", *g);
2077}
2078
2079void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
2080 char **e;
2081 unsigned i;
2082
2083 assert(c);
2084 assert(f);
2085
2086 prefix = strempty(prefix);
2087
2088 fprintf(f,
2089 "%sUMask: %04o\n"
2090 "%sWorkingDirectory: %s\n"
2091 "%sRootDirectory: %s\n"
2092 "%sNonBlocking: %s\n"
2093 "%sPrivateTmp: %s\n"
2094 "%sPrivateNetwork: %s\n"
2095 "%sPrivateDevices: %s\n"
2096 "%sIgnoreSIGPIPE: %s\n",
2097 prefix, c->umask,
2098 prefix, c->working_directory ? c->working_directory : "/",
2099 prefix, c->root_directory ? c->root_directory : "/",
2100 prefix, yes_no(c->non_blocking),
2101 prefix, yes_no(c->private_tmp),
2102 prefix, yes_no(c->private_network),
2103 prefix, yes_no(c->private_devices),
2104 prefix, yes_no(c->ignore_sigpipe));
2105
2106 STRV_FOREACH(e, c->environment)
2107 fprintf(f, "%sEnvironment: %s\n", prefix, *e);
2108
2109 STRV_FOREACH(e, c->environment_files)
2110 fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e);
2111
2112 if (c->tcpwrap_name)
2113 fprintf(f,
2114 "%sTCPWrapName: %s\n",
2115 prefix, c->tcpwrap_name);
2116
2117 if (c->nice_set)
2118 fprintf(f,
2119 "%sNice: %i\n",
2120 prefix, c->nice);
2121
2122 if (c->oom_score_adjust_set)
2123 fprintf(f,
2124 "%sOOMScoreAdjust: %i\n",
2125 prefix, c->oom_score_adjust);
2126
2127 for (i = 0; i < RLIM_NLIMITS; i++)
2128 if (c->rlimit[i])
2129 fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
2130
2131 if (c->ioprio_set) {
2132 _cleanup_free_ char *class_str = NULL;
2133
2134 ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str);
2135 fprintf(f,
2136 "%sIOSchedulingClass: %s\n"
2137 "%sIOPriority: %i\n",
2138 prefix, strna(class_str),
2139 prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
2140 }
2141
2142 if (c->cpu_sched_set) {
2143 _cleanup_free_ char *policy_str = NULL;
2144
2145 sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str);
2146 fprintf(f,
2147 "%sCPUSchedulingPolicy: %s\n"
2148 "%sCPUSchedulingPriority: %i\n"
2149 "%sCPUSchedulingResetOnFork: %s\n",
2150 prefix, strna(policy_str),
2151 prefix, c->cpu_sched_priority,
2152 prefix, yes_no(c->cpu_sched_reset_on_fork));
2153 }
2154
2155 if (c->cpuset) {
2156 fprintf(f, "%sCPUAffinity:", prefix);
2157 for (i = 0; i < c->cpuset_ncpus; i++)
2158 if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset))
2159 fprintf(f, " %u", i);
2160 fputs("\n", f);
2161 }
2162
2163 if (c->timer_slack_nsec != (nsec_t) -1)
2164 fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec);
2165
2166 fprintf(f,
2167 "%sStandardInput: %s\n"
2168 "%sStandardOutput: %s\n"
2169 "%sStandardError: %s\n",
2170 prefix, exec_input_to_string(c->std_input),
2171 prefix, exec_output_to_string(c->std_output),
2172 prefix, exec_output_to_string(c->std_error));
2173
2174 if (c->tty_path)
2175 fprintf(f,
2176 "%sTTYPath: %s\n"
2177 "%sTTYReset: %s\n"
2178 "%sTTYVHangup: %s\n"
2179 "%sTTYVTDisallocate: %s\n",
2180 prefix, c->tty_path,
2181 prefix, yes_no(c->tty_reset),
2182 prefix, yes_no(c->tty_vhangup),
2183 prefix, yes_no(c->tty_vt_disallocate));
2184
2185 if (c->std_output == EXEC_OUTPUT_SYSLOG ||
2186 c->std_output == EXEC_OUTPUT_KMSG ||
2187 c->std_output == EXEC_OUTPUT_JOURNAL ||
2188 c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
2189 c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
2190 c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE ||
2191 c->std_error == EXEC_OUTPUT_SYSLOG ||
2192 c->std_error == EXEC_OUTPUT_KMSG ||
2193 c->std_error == EXEC_OUTPUT_JOURNAL ||
2194 c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
2195 c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
2196 c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) {
2197
2198 _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL;
2199
2200 log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str);
2201 log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str);
2202
2203 fprintf(f,
2204 "%sSyslogFacility: %s\n"
2205 "%sSyslogLevel: %s\n",
2206 prefix, strna(fac_str),
2207 prefix, strna(lvl_str));
2208 }
2209
2210 if (c->capabilities) {
2211 _cleanup_cap_free_charp_ char *t;
2212
2213 t = cap_to_text(c->capabilities, NULL);
2214 if (t)
2215 fprintf(f, "%sCapabilities: %s\n", prefix, t);
2216 }
2217
2218 if (c->secure_bits)
2219 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
2220 prefix,
2221 (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "",
2222 (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
2223 (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
2224 (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
2225 (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "",
2226 (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
2227
2228 if (c->capability_bounding_set_drop) {
2229 unsigned long l;
2230 fprintf(f, "%sCapabilityBoundingSet:", prefix);
2231
2232 for (l = 0; l <= cap_last_cap(); l++)
2233 if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) {
2234 _cleanup_cap_free_charp_ char *t;
2235
2236 t = cap_to_name(l);
2237 if (t)
2238 fprintf(f, " %s", t);
2239 }
2240
2241 fputs("\n", f);
2242 }
2243
2244 if (c->user)
2245 fprintf(f, "%sUser: %s\n", prefix, c->user);
2246 if (c->group)
2247 fprintf(f, "%sGroup: %s\n", prefix, c->group);
2248
2249 if (strv_length(c->supplementary_groups) > 0) {
2250 fprintf(f, "%sSupplementaryGroups:", prefix);
2251 strv_fprintf(f, c->supplementary_groups);
2252 fputs("\n", f);
2253 }
2254
2255 if (c->pam_name)
2256 fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name);
2257
2258 if (strv_length(c->read_write_dirs) > 0) {
2259 fprintf(f, "%sReadWriteDirs:", prefix);
2260 strv_fprintf(f, c->read_write_dirs);
2261 fputs("\n", f);
2262 }
2263
2264 if (strv_length(c->read_only_dirs) > 0) {
2265 fprintf(f, "%sReadOnlyDirs:", prefix);
2266 strv_fprintf(f, c->read_only_dirs);
2267 fputs("\n", f);
2268 }
2269
2270 if (strv_length(c->inaccessible_dirs) > 0) {
2271 fprintf(f, "%sInaccessibleDirs:", prefix);
2272 strv_fprintf(f, c->inaccessible_dirs);
2273 fputs("\n", f);
2274 }
2275
2276 if (c->utmp_id)
2277 fprintf(f,
2278 "%sUtmpIdentifier: %s\n",
2279 prefix, c->utmp_id);
2280
2281 if (c->selinux_context)
2282 fprintf(f,
2283 "%sSELinuxContext: %s%s\n",
2284 prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context);
2285
2286 if (c->personality != 0xffffffffUL)
2287 fprintf(f,
2288 "%sPersonality: %s\n",
2289 prefix, strna(personality_to_string(c->personality)));
2290
2291 if (c->syscall_filter) {
2292#ifdef HAVE_SECCOMP
2293 Iterator j;
2294 void *id;
2295 bool first = true;
2296#endif
2297
2298 fprintf(f,
2299 "%sSystemCallFilter: ",
2300 prefix);
2301
2302 if (!c->syscall_whitelist)
2303 fputc('~', f);
2304
2305#ifdef HAVE_SECCOMP
2306 SET_FOREACH(id, c->syscall_filter, j) {
2307 _cleanup_free_ char *name = NULL;
2308
2309 if (first)
2310 first = false;
2311 else
2312 fputc(' ', f);
2313
2314 name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1);
2315 fputs(strna(name), f);
2316 }
2317#endif
2318
2319 fputc('\n', f);
2320 }
2321
2322 if (c->syscall_archs) {
2323#ifdef HAVE_SECCOMP
2324 Iterator j;
2325 void *id;
2326#endif
2327
2328 fprintf(f,
2329 "%sSystemCallArchitectures:",
2330 prefix);
2331
2332#ifdef HAVE_SECCOMP
2333 SET_FOREACH(id, c->syscall_archs, j)
2334 fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1)));
2335#endif
2336 fputc('\n', f);
2337 }
2338
2339 if (c->syscall_errno != 0)
2340 fprintf(f,
2341 "%sSystemCallErrorNumber: %s\n",
2342 prefix, strna(errno_to_name(c->syscall_errno)));
2343
2344 if (c->apparmor_profile)
2345 fprintf(f,
2346 "%sAppArmorProfile: %s%s\n",
2347 prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile);
2348}
2349
2350void exec_status_start(ExecStatus *s, pid_t pid) {
2351 assert(s);
2352
2353 zero(*s);
2354 s->pid = pid;
2355 dual_timestamp_get(&s->start_timestamp);
2356}
2357
2358void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) {
2359 assert(s);
2360
2361 if (s->pid && s->pid != pid)
2362 zero(*s);
2363
2364 s->pid = pid;
2365 dual_timestamp_get(&s->exit_timestamp);
2366
2367 s->code = code;
2368 s->status = status;
2369
2370 if (context) {
2371 if (context->utmp_id)
2372 utmp_put_dead_process(context->utmp_id, pid, code, status);
2373
2374 exec_context_tty_reset(context);
2375 }
2376}
2377
2378void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
2379 char buf[FORMAT_TIMESTAMP_MAX];
2380
2381 assert(s);
2382 assert(f);
2383
2384 if (!prefix)
2385 prefix = "";
2386
2387 if (s->pid <= 0)
2388 return;
2389
2390 fprintf(f,
2391 "%sPID: "PID_FMT"\n",
2392 prefix, s->pid);
2393
2394 if (s->start_timestamp.realtime > 0)
2395 fprintf(f,
2396 "%sStart Timestamp: %s\n",
2397 prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime));
2398
2399 if (s->exit_timestamp.realtime > 0)
2400 fprintf(f,
2401 "%sExit Timestamp: %s\n"
2402 "%sExit Code: %s\n"
2403 "%sExit Status: %i\n",
2404 prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime),
2405 prefix, sigchld_code_to_string(s->code),
2406 prefix, s->status);
2407}
2408
2409char *exec_command_line(char **argv) {
2410 size_t k;
2411 char *n, *p, **a;
2412 bool first = true;
2413
2414 assert(argv);
2415
2416 k = 1;
2417 STRV_FOREACH(a, argv)
2418 k += strlen(*a)+3;
2419
2420 if (!(n = new(char, k)))
2421 return NULL;
2422
2423 p = n;
2424 STRV_FOREACH(a, argv) {
2425
2426 if (!first)
2427 *(p++) = ' ';
2428 else
2429 first = false;
2430
2431 if (strpbrk(*a, WHITESPACE)) {
2432 *(p++) = '\'';
2433 p = stpcpy(p, *a);
2434 *(p++) = '\'';
2435 } else
2436 p = stpcpy(p, *a);
2437
2438 }
2439
2440 *p = 0;
2441
2442 /* FIXME: this doesn't really handle arguments that have
2443 * spaces and ticks in them */
2444
2445 return n;
2446}
2447
2448void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
2449 char *p2;
2450 const char *prefix2;
2451
2452 char *cmd;
2453
2454 assert(c);
2455 assert(f);
2456
2457 if (!prefix)
2458 prefix = "";
2459 p2 = strappend(prefix, "\t");
2460 prefix2 = p2 ? p2 : prefix;
2461
2462 cmd = exec_command_line(c->argv);
2463
2464 fprintf(f,
2465 "%sCommand Line: %s\n",
2466 prefix, cmd ? cmd : strerror(ENOMEM));
2467
2468 free(cmd);
2469
2470 exec_status_dump(&c->exec_status, f, prefix2);
2471
2472 free(p2);
2473}
2474
2475void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
2476 assert(f);
2477
2478 if (!prefix)
2479 prefix = "";
2480
2481 LIST_FOREACH(command, c, c)
2482 exec_command_dump(c, f, prefix);
2483}
2484
2485void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
2486 ExecCommand *end;
2487
2488 assert(l);
2489 assert(e);
2490
2491 if (*l) {
2492 /* It's kind of important, that we keep the order here */
2493 LIST_FIND_TAIL(command, *l, end);
2494 LIST_INSERT_AFTER(command, *l, end, e);
2495 } else
2496 *l = e;
2497}
2498
2499int exec_command_set(ExecCommand *c, const char *path, ...) {
2500 va_list ap;
2501 char **l, *p;
2502
2503 assert(c);
2504 assert(path);
2505
2506 va_start(ap, path);
2507 l = strv_new_ap(path, ap);
2508 va_end(ap);
2509
2510 if (!l)
2511 return -ENOMEM;
2512
2513 p = strdup(path);
2514 if (!p) {
2515 strv_free(l);
2516 return -ENOMEM;
2517 }
2518
2519 free(c->path);
2520 c->path = p;
2521
2522 strv_free(c->argv);
2523 c->argv = l;
2524
2525 return 0;
2526}
2527
2528static int exec_runtime_allocate(ExecRuntime **rt) {
2529
2530 if (*rt)
2531 return 0;
2532
2533 *rt = new0(ExecRuntime, 1);
2534 if (!*rt)
2535 return -ENOMEM;
2536
2537 (*rt)->n_ref = 1;
2538 (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1;
2539
2540 return 0;
2541}
2542
2543int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) {
2544 int r;
2545
2546 assert(rt);
2547 assert(c);
2548 assert(id);
2549
2550 if (*rt)
2551 return 1;
2552
2553 if (!c->private_network && !c->private_tmp)
2554 return 0;
2555
2556 r = exec_runtime_allocate(rt);
2557 if (r < 0)
2558 return r;
2559
2560 if (c->private_network && (*rt)->netns_storage_socket[0] < 0) {
2561 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, (*rt)->netns_storage_socket) < 0)
2562 return -errno;
2563 }
2564
2565 if (c->private_tmp && !(*rt)->tmp_dir) {
2566 r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir);
2567 if (r < 0)
2568 return r;
2569 }
2570
2571 return 1;
2572}
2573
2574ExecRuntime *exec_runtime_ref(ExecRuntime *r) {
2575 assert(r);
2576 assert(r->n_ref > 0);
2577
2578 r->n_ref++;
2579 return r;
2580}
2581
2582ExecRuntime *exec_runtime_unref(ExecRuntime *r) {
2583
2584 if (!r)
2585 return NULL;
2586
2587 assert(r->n_ref > 0);
2588
2589 r->n_ref--;
2590 if (r->n_ref <= 0) {
2591 free(r->tmp_dir);
2592 free(r->var_tmp_dir);
2593 close_pipe(r->netns_storage_socket);
2594 free(r);
2595 }
2596
2597 return NULL;
2598}
2599
2600int exec_runtime_serialize(ExecRuntime *rt, Unit *u, FILE *f, FDSet *fds) {
2601 assert(u);
2602 assert(f);
2603 assert(fds);
2604
2605 if (!rt)
2606 return 0;
2607
2608 if (rt->tmp_dir)
2609 unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir);
2610
2611 if (rt->var_tmp_dir)
2612 unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir);
2613
2614 if (rt->netns_storage_socket[0] >= 0) {
2615 int copy;
2616
2617 copy = fdset_put_dup(fds, rt->netns_storage_socket[0]);
2618 if (copy < 0)
2619 return copy;
2620
2621 unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy);
2622 }
2623
2624 if (rt->netns_storage_socket[1] >= 0) {
2625 int copy;
2626
2627 copy = fdset_put_dup(fds, rt->netns_storage_socket[1]);
2628 if (copy < 0)
2629 return copy;
2630
2631 unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy);
2632 }
2633
2634 return 0;
2635}
2636
2637int exec_runtime_deserialize_item(ExecRuntime **rt, Unit *u, const char *key, const char *value, FDSet *fds) {
2638 int r;
2639
2640 assert(rt);
2641 assert(key);
2642 assert(value);
2643
2644 if (streq(key, "tmp-dir")) {
2645 char *copy;
2646
2647 r = exec_runtime_allocate(rt);
2648 if (r < 0)
2649 return r;
2650
2651 copy = strdup(value);
2652 if (!copy)
2653 return log_oom();
2654
2655 free((*rt)->tmp_dir);
2656 (*rt)->tmp_dir = copy;
2657
2658 } else if (streq(key, "var-tmp-dir")) {
2659 char *copy;
2660
2661 r = exec_runtime_allocate(rt);
2662 if (r < 0)
2663 return r;
2664
2665 copy = strdup(value);
2666 if (!copy)
2667 return log_oom();
2668
2669 free((*rt)->var_tmp_dir);
2670 (*rt)->var_tmp_dir = copy;
2671
2672 } else if (streq(key, "netns-socket-0")) {
2673 int fd;
2674
2675 r = exec_runtime_allocate(rt);
2676 if (r < 0)
2677 return r;
2678
2679 if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
2680 log_debug_unit(u->id, "Failed to parse netns socket value %s", value);
2681 else {
2682 if ((*rt)->netns_storage_socket[0] >= 0)
2683 close_nointr_nofail((*rt)->netns_storage_socket[0]);
2684
2685 (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd);
2686 }
2687 } else if (streq(key, "netns-socket-1")) {
2688 int fd;
2689
2690 r = exec_runtime_allocate(rt);
2691 if (r < 0)
2692 return r;
2693
2694 if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
2695 log_debug_unit(u->id, "Failed to parse netns socket value %s", value);
2696 else {
2697 if ((*rt)->netns_storage_socket[1] >= 0)
2698 close_nointr_nofail((*rt)->netns_storage_socket[1]);
2699
2700 (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd);
2701 }
2702 } else
2703 return 0;
2704
2705 return 1;
2706}
2707
2708static void *remove_tmpdir_thread(void *p) {
2709 _cleanup_free_ char *path = p;
2710
2711 rm_rf_dangerous(path, false, true, false);
2712 return NULL;
2713}
2714
2715void exec_runtime_destroy(ExecRuntime *rt) {
2716 if (!rt)
2717 return;
2718
2719 /* If there are multiple users of this, let's leave the stuff around */
2720 if (rt->n_ref > 1)
2721 return;
2722
2723 if (rt->tmp_dir) {
2724 log_debug("Spawning thread to nuke %s", rt->tmp_dir);
2725 asynchronous_job(remove_tmpdir_thread, rt->tmp_dir);
2726 rt->tmp_dir = NULL;
2727 }
2728
2729 if (rt->var_tmp_dir) {
2730 log_debug("Spawning thread to nuke %s", rt->var_tmp_dir);
2731 asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir);
2732 rt->var_tmp_dir = NULL;
2733 }
2734
2735 close_pipe(rt->netns_storage_socket);
2736}
2737
2738static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
2739 [EXEC_INPUT_NULL] = "null",
2740 [EXEC_INPUT_TTY] = "tty",
2741 [EXEC_INPUT_TTY_FORCE] = "tty-force",
2742 [EXEC_INPUT_TTY_FAIL] = "tty-fail",
2743 [EXEC_INPUT_SOCKET] = "socket"
2744};
2745
2746DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
2747
2748static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
2749 [EXEC_OUTPUT_INHERIT] = "inherit",
2750 [EXEC_OUTPUT_NULL] = "null",
2751 [EXEC_OUTPUT_TTY] = "tty",
2752 [EXEC_OUTPUT_SYSLOG] = "syslog",
2753 [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console",
2754 [EXEC_OUTPUT_KMSG] = "kmsg",
2755 [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console",
2756 [EXEC_OUTPUT_JOURNAL] = "journal",
2757 [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console",
2758 [EXEC_OUTPUT_SOCKET] = "socket"
2759};
2760
2761DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
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