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core: remove tcpwrap support
[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
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
99 static 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 safe_close(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
143 static 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
179 static 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
192 static 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
200 static 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 safe_close(fd);
212 } else
213 r = nfd;
214
215 return r;
216 }
217
218 static 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 safe_close(fd);
237 return -errno;
238 }
239
240 if (shutdown(fd, SHUT_RD) < 0) {
241 safe_close(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 safe_close(fd);
266 } else
267 r = nfd;
268
269 return r;
270 }
271 static 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 safe_close(fd);
283 } else
284 r = nfd;
285
286 return r;
287 }
288
289 static 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
296 static 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
307 static 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
315 static 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 safe_close(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
357 static 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
445 static 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
463 static 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 safe_close(fd);
507
508 *_saved_stdin = saved_stdin;
509 *_saved_stdout = saved_stdout;
510
511 return 0;
512
513 fail:
514 safe_close(saved_stdout);
515 safe_close(saved_stdin);
516 safe_close(fd);
517
518 return r;
519 }
520
521 _printf_(1, 2) static int write_confirm_message(const char *format, ...) {
522 _cleanup_close_ int fd = -1;
523 va_list ap;
524
525 assert(format);
526
527 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
528 if (fd < 0)
529 return fd;
530
531 va_start(ap, format);
532 vdprintf(fd, format, ap);
533 va_end(ap);
534
535 return 0;
536 }
537
538 static int restore_confirm_stdio(int *saved_stdin,
539 int *saved_stdout) {
540
541 int r = 0;
542
543 assert(saved_stdin);
544 assert(saved_stdout);
545
546 release_terminal();
547
548 if (*saved_stdin >= 0)
549 if (dup2(*saved_stdin, STDIN_FILENO) < 0)
550 r = -errno;
551
552 if (*saved_stdout >= 0)
553 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
554 r = -errno;
555
556 safe_close(*saved_stdin);
557 safe_close(*saved_stdout);
558
559 return r;
560 }
561
562 static int ask_for_confirmation(char *response, char **argv) {
563 int saved_stdout = -1, saved_stdin = -1, r;
564 char *line;
565
566 r = setup_confirm_stdio(&saved_stdin, &saved_stdout);
567 if (r < 0)
568 return r;
569
570 line = exec_command_line(argv);
571 if (!line)
572 return -ENOMEM;
573
574 r = ask(response, "yns", "Execute %s? [Yes, No, Skip] ", line);
575 free(line);
576
577 restore_confirm_stdio(&saved_stdin, &saved_stdout);
578
579 return r;
580 }
581
582 static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
583 bool keep_groups = false;
584 int r;
585
586 assert(context);
587
588 /* Lookup and set GID and supplementary group list. Here too
589 * we avoid NSS lookups for gid=0. */
590
591 if (context->group || username) {
592
593 if (context->group) {
594 const char *g = context->group;
595
596 if ((r = get_group_creds(&g, &gid)) < 0)
597 return r;
598 }
599
600 /* First step, initialize groups from /etc/groups */
601 if (username && gid != 0) {
602 if (initgroups(username, gid) < 0)
603 return -errno;
604
605 keep_groups = true;
606 }
607
608 /* Second step, set our gids */
609 if (setresgid(gid, gid, gid) < 0)
610 return -errno;
611 }
612
613 if (context->supplementary_groups) {
614 int ngroups_max, k;
615 gid_t *gids;
616 char **i;
617
618 /* Final step, initialize any manually set supplementary groups */
619 assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0);
620
621 if (!(gids = new(gid_t, ngroups_max)))
622 return -ENOMEM;
623
624 if (keep_groups) {
625 if ((k = getgroups(ngroups_max, gids)) < 0) {
626 free(gids);
627 return -errno;
628 }
629 } else
630 k = 0;
631
632 STRV_FOREACH(i, context->supplementary_groups) {
633 const char *g;
634
635 if (k >= ngroups_max) {
636 free(gids);
637 return -E2BIG;
638 }
639
640 g = *i;
641 r = get_group_creds(&g, gids+k);
642 if (r < 0) {
643 free(gids);
644 return r;
645 }
646
647 k++;
648 }
649
650 if (setgroups(k, gids) < 0) {
651 free(gids);
652 return -errno;
653 }
654
655 free(gids);
656 }
657
658 return 0;
659 }
660
661 static int enforce_user(const ExecContext *context, uid_t uid) {
662 assert(context);
663
664 /* Sets (but doesn't lookup) the uid and make sure we keep the
665 * capabilities while doing so. */
666
667 if (context->capabilities) {
668 _cleanup_cap_free_ cap_t d = NULL;
669 static const cap_value_t bits[] = {
670 CAP_SETUID, /* Necessary so that we can run setresuid() below */
671 CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */
672 };
673
674 /* First step: If we need to keep capabilities but
675 * drop privileges we need to make sure we keep our
676 * caps, while we drop privileges. */
677 if (uid != 0) {
678 int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS;
679
680 if (prctl(PR_GET_SECUREBITS) != sb)
681 if (prctl(PR_SET_SECUREBITS, sb) < 0)
682 return -errno;
683 }
684
685 /* Second step: set the capabilities. This will reduce
686 * the capabilities to the minimum we need. */
687
688 d = cap_dup(context->capabilities);
689 if (!d)
690 return -errno;
691
692 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
693 cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0)
694 return -errno;
695
696 if (cap_set_proc(d) < 0)
697 return -errno;
698 }
699
700 /* Third step: actually set the uids */
701 if (setresuid(uid, uid, uid) < 0)
702 return -errno;
703
704 /* At this point we should have all necessary capabilities but
705 are otherwise a normal user. However, the caps might got
706 corrupted due to the setresuid() so we need clean them up
707 later. This is done outside of this call. */
708
709 return 0;
710 }
711
712 #ifdef HAVE_PAM
713
714 static int null_conv(
715 int num_msg,
716 const struct pam_message **msg,
717 struct pam_response **resp,
718 void *appdata_ptr) {
719
720 /* We don't support conversations */
721
722 return PAM_CONV_ERR;
723 }
724
725 static int setup_pam(
726 const char *name,
727 const char *user,
728 uid_t uid,
729 const char *tty,
730 char ***pam_env,
731 int fds[], unsigned n_fds) {
732
733 static const struct pam_conv conv = {
734 .conv = null_conv,
735 .appdata_ptr = NULL
736 };
737
738 pam_handle_t *handle = NULL;
739 sigset_t ss, old_ss;
740 int pam_code = PAM_SUCCESS;
741 int err;
742 char **e = NULL;
743 bool close_session = false;
744 pid_t pam_pid = 0, parent_pid;
745 int flags = 0;
746
747 assert(name);
748 assert(user);
749 assert(pam_env);
750
751 /* We set up PAM in the parent process, then fork. The child
752 * will then stay around until killed via PR_GET_PDEATHSIG or
753 * systemd via the cgroup logic. It will then remove the PAM
754 * session again. The parent process will exec() the actual
755 * daemon. We do things this way to ensure that the main PID
756 * of the daemon is the one we initially fork()ed. */
757
758 if (log_get_max_level() < LOG_PRI(LOG_DEBUG))
759 flags |= PAM_SILENT;
760
761 pam_code = pam_start(name, user, &conv, &handle);
762 if (pam_code != PAM_SUCCESS) {
763 handle = NULL;
764 goto fail;
765 }
766
767 if (tty) {
768 pam_code = pam_set_item(handle, PAM_TTY, tty);
769 if (pam_code != PAM_SUCCESS)
770 goto fail;
771 }
772
773 pam_code = pam_acct_mgmt(handle, flags);
774 if (pam_code != PAM_SUCCESS)
775 goto fail;
776
777 pam_code = pam_open_session(handle, flags);
778 if (pam_code != PAM_SUCCESS)
779 goto fail;
780
781 close_session = true;
782
783 e = pam_getenvlist(handle);
784 if (!e) {
785 pam_code = PAM_BUF_ERR;
786 goto fail;
787 }
788
789 /* Block SIGTERM, so that we know that it won't get lost in
790 * the child */
791 if (sigemptyset(&ss) < 0 ||
792 sigaddset(&ss, SIGTERM) < 0 ||
793 sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0)
794 goto fail;
795
796 parent_pid = getpid();
797
798 pam_pid = fork();
799 if (pam_pid < 0)
800 goto fail;
801
802 if (pam_pid == 0) {
803 int sig;
804 int r = EXIT_PAM;
805
806 /* The child's job is to reset the PAM session on
807 * termination */
808
809 /* This string must fit in 10 chars (i.e. the length
810 * of "/sbin/init"), to look pretty in /bin/ps */
811 rename_process("(sd-pam)");
812
813 /* Make sure we don't keep open the passed fds in this
814 child. We assume that otherwise only those fds are
815 open here that have been opened by PAM. */
816 close_many(fds, n_fds);
817
818 /* Drop privileges - we don't need any to pam_close_session
819 * and this will make PR_SET_PDEATHSIG work in most cases.
820 * If this fails, ignore the error - but expect sd-pam threads
821 * to fail to exit normally */
822 if (setresuid(uid, uid, uid) < 0)
823 log_error("Error: Failed to setresuid() in sd-pam: %s", strerror(-r));
824
825 /* Wait until our parent died. This will only work if
826 * the above setresuid() succeeds, otherwise the kernel
827 * will not allow unprivileged parents kill their privileged
828 * children this way. We rely on the control groups kill logic
829 * to do the rest for us. */
830 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
831 goto child_finish;
832
833 /* Check if our parent process might already have
834 * died? */
835 if (getppid() == parent_pid) {
836 for (;;) {
837 if (sigwait(&ss, &sig) < 0) {
838 if (errno == EINTR)
839 continue;
840
841 goto child_finish;
842 }
843
844 assert(sig == SIGTERM);
845 break;
846 }
847 }
848
849 /* If our parent died we'll end the session */
850 if (getppid() != parent_pid) {
851 pam_code = pam_close_session(handle, flags);
852 if (pam_code != PAM_SUCCESS)
853 goto child_finish;
854 }
855
856 r = 0;
857
858 child_finish:
859 pam_end(handle, pam_code | flags);
860 _exit(r);
861 }
862
863 /* If the child was forked off successfully it will do all the
864 * cleanups, so forget about the handle here. */
865 handle = NULL;
866
867 /* Unblock SIGTERM again in the parent */
868 if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0)
869 goto fail;
870
871 /* We close the log explicitly here, since the PAM modules
872 * might have opened it, but we don't want this fd around. */
873 closelog();
874
875 *pam_env = e;
876 e = NULL;
877
878 return 0;
879
880 fail:
881 if (pam_code != PAM_SUCCESS) {
882 log_error("PAM failed: %s", pam_strerror(handle, pam_code));
883 err = -EPERM; /* PAM errors do not map to errno */
884 } else {
885 log_error("PAM failed: %m");
886 err = -errno;
887 }
888
889 if (handle) {
890 if (close_session)
891 pam_code = pam_close_session(handle, flags);
892
893 pam_end(handle, pam_code | flags);
894 }
895
896 strv_free(e);
897
898 closelog();
899
900 if (pam_pid > 1) {
901 kill(pam_pid, SIGTERM);
902 kill(pam_pid, SIGCONT);
903 }
904
905 return err;
906 }
907 #endif
908
909 static void rename_process_from_path(const char *path) {
910 char process_name[11];
911 const char *p;
912 size_t l;
913
914 /* This resulting string must fit in 10 chars (i.e. the length
915 * of "/sbin/init") to look pretty in /bin/ps */
916
917 p = basename(path);
918 if (isempty(p)) {
919 rename_process("(...)");
920 return;
921 }
922
923 l = strlen(p);
924 if (l > 8) {
925 /* The end of the process name is usually more
926 * interesting, since the first bit might just be
927 * "systemd-" */
928 p = p + l - 8;
929 l = 8;
930 }
931
932 process_name[0] = '(';
933 memcpy(process_name+1, p, l);
934 process_name[1+l] = ')';
935 process_name[1+l+1] = 0;
936
937 rename_process(process_name);
938 }
939
940 #ifdef HAVE_SECCOMP
941
942 static int apply_seccomp(ExecContext *c) {
943 uint32_t negative_action, action;
944 scmp_filter_ctx *seccomp;
945 Iterator i;
946 void *id;
947 int r;
948
949 assert(c);
950
951 negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno);
952
953 seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW);
954 if (!seccomp)
955 return -ENOMEM;
956
957 if (c->syscall_archs) {
958
959 SET_FOREACH(id, c->syscall_archs, i) {
960 r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1);
961 if (r == -EEXIST)
962 continue;
963 if (r < 0)
964 goto finish;
965 }
966
967 } else {
968 r = seccomp_add_secondary_archs(seccomp);
969 if (r < 0)
970 goto finish;
971 }
972
973 action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action;
974 SET_FOREACH(id, c->syscall_filter, i) {
975 r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0);
976 if (r < 0)
977 goto finish;
978 }
979
980 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
981 if (r < 0)
982 goto finish;
983
984 r = seccomp_load(seccomp);
985
986 finish:
987 seccomp_release(seccomp);
988 return r;
989 }
990
991 static int apply_address_families(ExecContext *c) {
992 scmp_filter_ctx *seccomp;
993 Iterator i;
994 int r;
995
996 assert(c);
997
998 seccomp = seccomp_init(SCMP_ACT_ALLOW);
999 if (!seccomp)
1000 return -ENOMEM;
1001
1002 r = seccomp_add_secondary_archs(seccomp);
1003 if (r < 0)
1004 goto finish;
1005
1006 if (c->address_families_whitelist) {
1007 int af, first = 0, last = 0;
1008 void *afp;
1009
1010 /* If this is a whitelist, we first block the address
1011 * families that are out of range and then everything
1012 * that is not in the set. First, we find the lowest
1013 * and highest address family in the set. */
1014
1015 SET_FOREACH(afp, c->address_families, i) {
1016 af = PTR_TO_INT(afp);
1017
1018 if (af <= 0 || af >= af_max())
1019 continue;
1020
1021 if (first == 0 || af < first)
1022 first = af;
1023
1024 if (last == 0 || af > last)
1025 last = af;
1026 }
1027
1028 assert((first == 0) == (last == 0));
1029
1030 if (first == 0) {
1031
1032 /* No entries in the valid range, block everything */
1033 r = seccomp_rule_add(
1034 seccomp,
1035 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1036 SCMP_SYS(socket),
1037 0);
1038 if (r < 0)
1039 goto finish;
1040
1041 } else {
1042
1043 /* Block everything below the first entry */
1044 r = seccomp_rule_add(
1045 seccomp,
1046 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1047 SCMP_SYS(socket),
1048 1,
1049 SCMP_A0(SCMP_CMP_LT, first));
1050 if (r < 0)
1051 goto finish;
1052
1053 /* Block everything above the last entry */
1054 r = seccomp_rule_add(
1055 seccomp,
1056 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1057 SCMP_SYS(socket),
1058 1,
1059 SCMP_A0(SCMP_CMP_GT, last));
1060 if (r < 0)
1061 goto finish;
1062
1063 /* Block everything between the first and last
1064 * entry */
1065 for (af = 1; af < af_max(); af++) {
1066
1067 if (set_contains(c->address_families, INT_TO_PTR(af)))
1068 continue;
1069
1070 r = seccomp_rule_add(
1071 seccomp,
1072 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1073 SCMP_SYS(socket),
1074 1,
1075 SCMP_A0(SCMP_CMP_EQ, af));
1076 if (r < 0)
1077 goto finish;
1078 }
1079 }
1080
1081 } else {
1082 void *af;
1083
1084 /* If this is a blacklist, then generate one rule for
1085 * each address family that are then combined in OR
1086 * checks. */
1087
1088 SET_FOREACH(af, c->address_families, i) {
1089
1090 r = seccomp_rule_add(
1091 seccomp,
1092 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1093 SCMP_SYS(socket),
1094 1,
1095 SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af)));
1096 if (r < 0)
1097 goto finish;
1098 }
1099 }
1100
1101 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
1102 if (r < 0)
1103 goto finish;
1104
1105 r = seccomp_load(seccomp);
1106
1107 finish:
1108 seccomp_release(seccomp);
1109 return r;
1110 }
1111
1112 #endif
1113
1114 static void do_idle_pipe_dance(int idle_pipe[4]) {
1115 assert(idle_pipe);
1116
1117
1118 safe_close(idle_pipe[1]);
1119 safe_close(idle_pipe[2]);
1120
1121 if (idle_pipe[0] >= 0) {
1122 int r;
1123
1124 r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC);
1125
1126 if (idle_pipe[3] >= 0 && r == 0 /* timeout */) {
1127 /* Signal systemd that we are bored and want to continue. */
1128 write(idle_pipe[3], "x", 1);
1129
1130 /* Wait for systemd to react to the signal above. */
1131 fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC);
1132 }
1133
1134 safe_close(idle_pipe[0]);
1135
1136 }
1137
1138 safe_close(idle_pipe[3]);
1139 }
1140
1141 static int build_environment(
1142 ExecContext *c,
1143 unsigned n_fds,
1144 usec_t watchdog_usec,
1145 const char *home,
1146 const char *username,
1147 const char *shell,
1148 char ***ret) {
1149
1150 _cleanup_strv_free_ char **our_env = NULL;
1151 unsigned n_env = 0;
1152 char *x;
1153
1154 assert(c);
1155 assert(ret);
1156
1157 our_env = new0(char*, 10);
1158 if (!our_env)
1159 return -ENOMEM;
1160
1161 if (n_fds > 0) {
1162 if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0)
1163 return -ENOMEM;
1164 our_env[n_env++] = x;
1165
1166 if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0)
1167 return -ENOMEM;
1168 our_env[n_env++] = x;
1169 }
1170
1171 if (watchdog_usec > 0) {
1172 if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0)
1173 return -ENOMEM;
1174 our_env[n_env++] = x;
1175
1176 if (asprintf(&x, "WATCHDOG_USEC=%llu", (unsigned long long) watchdog_usec) < 0)
1177 return -ENOMEM;
1178 our_env[n_env++] = x;
1179 }
1180
1181 if (home) {
1182 x = strappend("HOME=", home);
1183 if (!x)
1184 return -ENOMEM;
1185 our_env[n_env++] = x;
1186 }
1187
1188 if (username) {
1189 x = strappend("LOGNAME=", username);
1190 if (!x)
1191 return -ENOMEM;
1192 our_env[n_env++] = x;
1193
1194 x = strappend("USER=", username);
1195 if (!x)
1196 return -ENOMEM;
1197 our_env[n_env++] = x;
1198 }
1199
1200 if (shell) {
1201 x = strappend("SHELL=", shell);
1202 if (!x)
1203 return -ENOMEM;
1204 our_env[n_env++] = x;
1205 }
1206
1207 if (is_terminal_input(c->std_input) ||
1208 c->std_output == EXEC_OUTPUT_TTY ||
1209 c->std_error == EXEC_OUTPUT_TTY ||
1210 c->tty_path) {
1211
1212 x = strdup(default_term_for_tty(tty_path(c)));
1213 if (!x)
1214 return -ENOMEM;
1215 our_env[n_env++] = x;
1216 }
1217
1218 our_env[n_env++] = NULL;
1219 assert(n_env <= 10);
1220
1221 *ret = our_env;
1222 our_env = NULL;
1223
1224 return 0;
1225 }
1226
1227 int exec_spawn(ExecCommand *command,
1228 char **argv,
1229 ExecContext *context,
1230 int fds[], unsigned n_fds,
1231 char **environment,
1232 bool apply_permissions,
1233 bool apply_chroot,
1234 bool apply_tty_stdin,
1235 bool confirm_spawn,
1236 CGroupControllerMask cgroup_supported,
1237 const char *cgroup_path,
1238 const char *runtime_prefix,
1239 const char *unit_id,
1240 usec_t watchdog_usec,
1241 int idle_pipe[4],
1242 ExecRuntime *runtime,
1243 pid_t *ret) {
1244
1245 _cleanup_strv_free_ char **files_env = NULL;
1246 int socket_fd;
1247 char *line;
1248 pid_t pid;
1249 int r;
1250
1251 assert(command);
1252 assert(context);
1253 assert(ret);
1254 assert(fds || n_fds <= 0);
1255
1256 if (context->std_input == EXEC_INPUT_SOCKET ||
1257 context->std_output == EXEC_OUTPUT_SOCKET ||
1258 context->std_error == EXEC_OUTPUT_SOCKET) {
1259
1260 if (n_fds != 1)
1261 return -EINVAL;
1262
1263 socket_fd = fds[0];
1264
1265 fds = NULL;
1266 n_fds = 0;
1267 } else
1268 socket_fd = -1;
1269
1270 r = exec_context_load_environment(context, &files_env);
1271 if (r < 0) {
1272 log_struct_unit(LOG_ERR,
1273 unit_id,
1274 "MESSAGE=Failed to load environment files: %s", strerror(-r),
1275 "ERRNO=%d", -r,
1276 NULL);
1277 return r;
1278 }
1279
1280 if (!argv)
1281 argv = command->argv;
1282
1283 line = exec_command_line(argv);
1284 if (!line)
1285 return log_oom();
1286
1287 log_struct_unit(LOG_DEBUG,
1288 unit_id,
1289 "EXECUTABLE=%s", command->path,
1290 "MESSAGE=About to execute: %s", line,
1291 NULL);
1292 free(line);
1293
1294 pid = fork();
1295 if (pid < 0)
1296 return -errno;
1297
1298 if (pid == 0) {
1299 _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
1300 const char *username = NULL, *home = NULL, *shell = NULL;
1301 unsigned n_dont_close = 0;
1302 int dont_close[n_fds + 3];
1303 uid_t uid = (uid_t) -1;
1304 gid_t gid = (gid_t) -1;
1305 sigset_t ss;
1306 int i, err;
1307
1308 /* child */
1309
1310 rename_process_from_path(command->path);
1311
1312 /* We reset exactly these signals, since they are the
1313 * only ones we set to SIG_IGN in the main daemon. All
1314 * others we leave untouched because we set them to
1315 * SIG_DFL or a valid handler initially, both of which
1316 * will be demoted to SIG_DFL. */
1317 default_signals(SIGNALS_CRASH_HANDLER,
1318 SIGNALS_IGNORE, -1);
1319
1320 if (context->ignore_sigpipe)
1321 ignore_signals(SIGPIPE, -1);
1322
1323 assert_se(sigemptyset(&ss) == 0);
1324 if (sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
1325 err = -errno;
1326 r = EXIT_SIGNAL_MASK;
1327 goto fail_child;
1328 }
1329
1330 if (idle_pipe)
1331 do_idle_pipe_dance(idle_pipe);
1332
1333 /* Close sockets very early to make sure we don't
1334 * block init reexecution because it cannot bind its
1335 * sockets */
1336 log_forget_fds();
1337
1338 if (socket_fd >= 0)
1339 dont_close[n_dont_close++] = socket_fd;
1340 if (n_fds > 0) {
1341 memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds);
1342 n_dont_close += n_fds;
1343 }
1344 if (runtime) {
1345 if (runtime->netns_storage_socket[0] >= 0)
1346 dont_close[n_dont_close++] = runtime->netns_storage_socket[0];
1347 if (runtime->netns_storage_socket[1] >= 0)
1348 dont_close[n_dont_close++] = runtime->netns_storage_socket[1];
1349 }
1350
1351 err = close_all_fds(dont_close, n_dont_close);
1352 if (err < 0) {
1353 r = EXIT_FDS;
1354 goto fail_child;
1355 }
1356
1357 if (!context->same_pgrp)
1358 if (setsid() < 0) {
1359 err = -errno;
1360 r = EXIT_SETSID;
1361 goto fail_child;
1362 }
1363
1364 exec_context_tty_reset(context);
1365
1366 if (confirm_spawn) {
1367 char response;
1368
1369 err = ask_for_confirmation(&response, argv);
1370 if (err == -ETIMEDOUT)
1371 write_confirm_message("Confirmation question timed out, assuming positive response.\n");
1372 else if (err < 0)
1373 write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-err));
1374 else if (response == 's') {
1375 write_confirm_message("Skipping execution.\n");
1376 err = -ECANCELED;
1377 r = EXIT_CONFIRM;
1378 goto fail_child;
1379 } else if (response == 'n') {
1380 write_confirm_message("Failing execution.\n");
1381 err = r = 0;
1382 goto fail_child;
1383 }
1384 }
1385
1386 /* If a socket is connected to STDIN/STDOUT/STDERR, we
1387 * must sure to drop O_NONBLOCK */
1388 if (socket_fd >= 0)
1389 fd_nonblock(socket_fd, false);
1390
1391 err = setup_input(context, socket_fd, apply_tty_stdin);
1392 if (err < 0) {
1393 r = EXIT_STDIN;
1394 goto fail_child;
1395 }
1396
1397 err = setup_output(context, STDOUT_FILENO, socket_fd, basename(command->path), unit_id, apply_tty_stdin);
1398 if (err < 0) {
1399 r = EXIT_STDOUT;
1400 goto fail_child;
1401 }
1402
1403 err = setup_output(context, STDERR_FILENO, socket_fd, basename(command->path), unit_id, apply_tty_stdin);
1404 if (err < 0) {
1405 r = EXIT_STDERR;
1406 goto fail_child;
1407 }
1408
1409 if (cgroup_path) {
1410 err = cg_attach_everywhere(cgroup_supported, cgroup_path, 0);
1411 if (err < 0) {
1412 r = EXIT_CGROUP;
1413 goto fail_child;
1414 }
1415 }
1416
1417 if (context->oom_score_adjust_set) {
1418 char t[16];
1419
1420 snprintf(t, sizeof(t), "%i", context->oom_score_adjust);
1421 char_array_0(t);
1422
1423 if (write_string_file("/proc/self/oom_score_adj", t) < 0) {
1424 err = -errno;
1425 r = EXIT_OOM_ADJUST;
1426 goto fail_child;
1427 }
1428 }
1429
1430 if (context->nice_set)
1431 if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
1432 err = -errno;
1433 r = EXIT_NICE;
1434 goto fail_child;
1435 }
1436
1437 if (context->cpu_sched_set) {
1438 struct sched_param param = {
1439 .sched_priority = context->cpu_sched_priority,
1440 };
1441
1442 r = sched_setscheduler(0,
1443 context->cpu_sched_policy |
1444 (context->cpu_sched_reset_on_fork ?
1445 SCHED_RESET_ON_FORK : 0),
1446 &param);
1447 if (r < 0) {
1448 err = -errno;
1449 r = EXIT_SETSCHEDULER;
1450 goto fail_child;
1451 }
1452 }
1453
1454 if (context->cpuset)
1455 if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
1456 err = -errno;
1457 r = EXIT_CPUAFFINITY;
1458 goto fail_child;
1459 }
1460
1461 if (context->ioprio_set)
1462 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
1463 err = -errno;
1464 r = EXIT_IOPRIO;
1465 goto fail_child;
1466 }
1467
1468 if (context->timer_slack_nsec != (nsec_t) -1)
1469 if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
1470 err = -errno;
1471 r = EXIT_TIMERSLACK;
1472 goto fail_child;
1473 }
1474
1475 if (context->personality != 0xffffffffUL)
1476 if (personality(context->personality) < 0) {
1477 err = -errno;
1478 r = EXIT_PERSONALITY;
1479 goto fail_child;
1480 }
1481
1482 if (context->utmp_id)
1483 utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path);
1484
1485 if (context->user) {
1486 username = context->user;
1487 err = get_user_creds(&username, &uid, &gid, &home, &shell);
1488 if (err < 0) {
1489 r = EXIT_USER;
1490 goto fail_child;
1491 }
1492
1493 if (is_terminal_input(context->std_input)) {
1494 err = chown_terminal(STDIN_FILENO, uid);
1495 if (err < 0) {
1496 r = EXIT_STDIN;
1497 goto fail_child;
1498 }
1499 }
1500 }
1501
1502 #ifdef HAVE_PAM
1503 if (cgroup_path && context->user && context->pam_name) {
1504 err = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, 0644, uid, gid);
1505 if (err < 0) {
1506 r = EXIT_CGROUP;
1507 goto fail_child;
1508 }
1509
1510
1511 err = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, 0755, uid, gid);
1512 if (err < 0) {
1513 r = EXIT_CGROUP;
1514 goto fail_child;
1515 }
1516 }
1517 #endif
1518
1519 if (!strv_isempty(context->runtime_directory) && runtime_prefix) {
1520 char **rt;
1521
1522 STRV_FOREACH(rt, context->runtime_directory) {
1523 _cleanup_free_ char *p;
1524
1525 p = strjoin(runtime_prefix, "/", *rt, NULL);
1526 if (!p) {
1527 r = EXIT_RUNTIME_DIRECTORY;
1528 err = -ENOMEM;
1529 goto fail_child;
1530 }
1531
1532 err = mkdir_safe(p, context->runtime_directory_mode, uid, gid);
1533 if (err < 0) {
1534 r = EXIT_RUNTIME_DIRECTORY;
1535 goto fail_child;
1536 }
1537 }
1538 }
1539
1540 if (apply_permissions) {
1541 err = enforce_groups(context, username, gid);
1542 if (err < 0) {
1543 r = EXIT_GROUP;
1544 goto fail_child;
1545 }
1546 }
1547
1548 umask(context->umask);
1549
1550 #ifdef HAVE_PAM
1551 if (apply_permissions && context->pam_name && username) {
1552 err = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds);
1553 if (err < 0) {
1554 r = EXIT_PAM;
1555 goto fail_child;
1556 }
1557 }
1558 #endif
1559 if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) {
1560 err = setup_netns(runtime->netns_storage_socket);
1561 if (err < 0) {
1562 r = EXIT_NETWORK;
1563 goto fail_child;
1564 }
1565 }
1566
1567 if (!strv_isempty(context->read_write_dirs) ||
1568 !strv_isempty(context->read_only_dirs) ||
1569 !strv_isempty(context->inaccessible_dirs) ||
1570 context->mount_flags != 0 ||
1571 (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) ||
1572 context->private_devices) {
1573
1574 char *tmp = NULL, *var = NULL;
1575
1576 /* The runtime struct only contains the parent
1577 * of the private /tmp, which is
1578 * non-accessible to world users. Inside of it
1579 * there's a /tmp that is sticky, and that's
1580 * the one we want to use here. */
1581
1582 if (context->private_tmp && runtime) {
1583 if (runtime->tmp_dir)
1584 tmp = strappenda(runtime->tmp_dir, "/tmp");
1585 if (runtime->var_tmp_dir)
1586 var = strappenda(runtime->var_tmp_dir, "/tmp");
1587 }
1588
1589 err = setup_namespace(
1590 context->read_write_dirs,
1591 context->read_only_dirs,
1592 context->inaccessible_dirs,
1593 tmp,
1594 var,
1595 context->private_devices,
1596 context->mount_flags);
1597
1598 if (err < 0) {
1599 r = EXIT_NAMESPACE;
1600 goto fail_child;
1601 }
1602 }
1603
1604 if (apply_chroot) {
1605 if (context->root_directory)
1606 if (chroot(context->root_directory) < 0) {
1607 err = -errno;
1608 r = EXIT_CHROOT;
1609 goto fail_child;
1610 }
1611
1612 if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
1613 err = -errno;
1614 r = EXIT_CHDIR;
1615 goto fail_child;
1616 }
1617 } else {
1618 _cleanup_free_ char *d = NULL;
1619
1620 if (asprintf(&d, "%s/%s",
1621 context->root_directory ? context->root_directory : "",
1622 context->working_directory ? context->working_directory : "") < 0) {
1623 err = -ENOMEM;
1624 r = EXIT_MEMORY;
1625 goto fail_child;
1626 }
1627
1628 if (chdir(d) < 0) {
1629 err = -errno;
1630 r = EXIT_CHDIR;
1631 goto fail_child;
1632 }
1633 }
1634
1635 /* We repeat the fd closing here, to make sure that
1636 * nothing is leaked from the PAM modules */
1637 err = close_all_fds(fds, n_fds);
1638 if (err >= 0)
1639 err = shift_fds(fds, n_fds);
1640 if (err >= 0)
1641 err = flags_fds(fds, n_fds, context->non_blocking);
1642 if (err < 0) {
1643 r = EXIT_FDS;
1644 goto fail_child;
1645 }
1646
1647 if (apply_permissions) {
1648
1649 for (i = 0; i < _RLIMIT_MAX; i++) {
1650 if (!context->rlimit[i])
1651 continue;
1652
1653 if (setrlimit_closest(i, context->rlimit[i]) < 0) {
1654 err = -errno;
1655 r = EXIT_LIMITS;
1656 goto fail_child;
1657 }
1658 }
1659
1660 if (context->capability_bounding_set_drop) {
1661 err = capability_bounding_set_drop(context->capability_bounding_set_drop, false);
1662 if (err < 0) {
1663 r = EXIT_CAPABILITIES;
1664 goto fail_child;
1665 }
1666 }
1667
1668 if (context->user) {
1669 err = enforce_user(context, uid);
1670 if (err < 0) {
1671 r = EXIT_USER;
1672 goto fail_child;
1673 }
1674 }
1675
1676 /* PR_GET_SECUREBITS is not privileged, while
1677 * PR_SET_SECUREBITS is. So to suppress
1678 * potential EPERMs we'll try not to call
1679 * PR_SET_SECUREBITS unless necessary. */
1680 if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
1681 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
1682 err = -errno;
1683 r = EXIT_SECUREBITS;
1684 goto fail_child;
1685 }
1686
1687 if (context->capabilities)
1688 if (cap_set_proc(context->capabilities) < 0) {
1689 err = -errno;
1690 r = EXIT_CAPABILITIES;
1691 goto fail_child;
1692 }
1693
1694 if (context->no_new_privileges)
1695 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
1696 err = -errno;
1697 r = EXIT_NO_NEW_PRIVILEGES;
1698 goto fail_child;
1699 }
1700
1701 #ifdef HAVE_SECCOMP
1702 if (context->address_families_whitelist ||
1703 !set_isempty(context->address_families)) {
1704 err = apply_address_families(context);
1705 if (err < 0) {
1706 r = EXIT_ADDRESS_FAMILIES;
1707 goto fail_child;
1708 }
1709 }
1710
1711 if (context->syscall_whitelist ||
1712 !set_isempty(context->syscall_filter) ||
1713 !set_isempty(context->syscall_archs)) {
1714 err = apply_seccomp(context);
1715 if (err < 0) {
1716 r = EXIT_SECCOMP;
1717 goto fail_child;
1718 }
1719 }
1720 #endif
1721
1722 #ifdef HAVE_SELINUX
1723 if (context->selinux_context && use_selinux()) {
1724 err = setexeccon(context->selinux_context);
1725 if (err < 0 && !context->selinux_context_ignore) {
1726 r = EXIT_SELINUX_CONTEXT;
1727 goto fail_child;
1728 }
1729 }
1730 #endif
1731
1732 #ifdef HAVE_APPARMOR
1733 if (context->apparmor_profile && use_apparmor()) {
1734 err = aa_change_onexec(context->apparmor_profile);
1735 if (err < 0 && !context->apparmor_profile_ignore) {
1736 r = EXIT_APPARMOR_PROFILE;
1737 goto fail_child;
1738 }
1739 }
1740 #endif
1741 }
1742
1743 err = build_environment(context, n_fds, watchdog_usec, home, username, shell, &our_env);
1744 if (r < 0) {
1745 r = EXIT_MEMORY;
1746 goto fail_child;
1747 }
1748
1749 final_env = strv_env_merge(5,
1750 environment,
1751 our_env,
1752 context->environment,
1753 files_env,
1754 pam_env,
1755 NULL);
1756 if (!final_env) {
1757 err = -ENOMEM;
1758 r = EXIT_MEMORY;
1759 goto fail_child;
1760 }
1761
1762 final_argv = replace_env_argv(argv, final_env);
1763 if (!final_argv) {
1764 err = -ENOMEM;
1765 r = EXIT_MEMORY;
1766 goto fail_child;
1767 }
1768
1769 final_env = strv_env_clean(final_env);
1770
1771 if (_unlikely_(log_get_max_level() >= LOG_PRI(LOG_DEBUG))) {
1772 line = exec_command_line(final_argv);
1773 if (line) {
1774 log_open();
1775 log_struct_unit(LOG_DEBUG,
1776 unit_id,
1777 "EXECUTABLE=%s", command->path,
1778 "MESSAGE=Executing: %s", line,
1779 NULL);
1780 log_close();
1781 free(line);
1782 line = NULL;
1783 }
1784 }
1785 execve(command->path, final_argv, final_env);
1786 err = -errno;
1787 r = EXIT_EXEC;
1788
1789 fail_child:
1790 if (r != 0) {
1791 log_open();
1792 log_struct(LOG_ERR, MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED),
1793 "EXECUTABLE=%s", command->path,
1794 "MESSAGE=Failed at step %s spawning %s: %s",
1795 exit_status_to_string(r, EXIT_STATUS_SYSTEMD),
1796 command->path, strerror(-err),
1797 "ERRNO=%d", -err,
1798 NULL);
1799 log_close();
1800 }
1801
1802 _exit(r);
1803 }
1804
1805 log_struct_unit(LOG_DEBUG,
1806 unit_id,
1807 "MESSAGE=Forked %s as "PID_FMT,
1808 command->path, pid,
1809 NULL);
1810
1811 /* We add the new process to the cgroup both in the child (so
1812 * that we can be sure that no user code is ever executed
1813 * outside of the cgroup) and in the parent (so that we can be
1814 * sure that when we kill the cgroup the process will be
1815 * killed too). */
1816 if (cgroup_path)
1817 cg_attach(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, pid);
1818
1819 exec_status_start(&command->exec_status, pid);
1820
1821 *ret = pid;
1822 return 0;
1823 }
1824
1825 void exec_context_init(ExecContext *c) {
1826 assert(c);
1827
1828 c->umask = 0022;
1829 c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
1830 c->cpu_sched_policy = SCHED_OTHER;
1831 c->syslog_priority = LOG_DAEMON|LOG_INFO;
1832 c->syslog_level_prefix = true;
1833 c->ignore_sigpipe = true;
1834 c->timer_slack_nsec = (nsec_t) -1;
1835 c->personality = 0xffffffffUL;
1836 c->runtime_directory_mode = 0755;
1837 }
1838
1839 void exec_context_done(ExecContext *c) {
1840 unsigned l;
1841
1842 assert(c);
1843
1844 strv_free(c->environment);
1845 c->environment = NULL;
1846
1847 strv_free(c->environment_files);
1848 c->environment_files = NULL;
1849
1850 for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
1851 free(c->rlimit[l]);
1852 c->rlimit[l] = NULL;
1853 }
1854
1855 free(c->working_directory);
1856 c->working_directory = NULL;
1857 free(c->root_directory);
1858 c->root_directory = NULL;
1859
1860 free(c->tty_path);
1861 c->tty_path = NULL;
1862
1863 free(c->syslog_identifier);
1864 c->syslog_identifier = NULL;
1865
1866 free(c->user);
1867 c->user = NULL;
1868
1869 free(c->group);
1870 c->group = NULL;
1871
1872 strv_free(c->supplementary_groups);
1873 c->supplementary_groups = NULL;
1874
1875 free(c->pam_name);
1876 c->pam_name = NULL;
1877
1878 if (c->capabilities) {
1879 cap_free(c->capabilities);
1880 c->capabilities = NULL;
1881 }
1882
1883 strv_free(c->read_only_dirs);
1884 c->read_only_dirs = NULL;
1885
1886 strv_free(c->read_write_dirs);
1887 c->read_write_dirs = NULL;
1888
1889 strv_free(c->inaccessible_dirs);
1890 c->inaccessible_dirs = NULL;
1891
1892 if (c->cpuset)
1893 CPU_FREE(c->cpuset);
1894
1895 free(c->utmp_id);
1896 c->utmp_id = NULL;
1897
1898 free(c->selinux_context);
1899 c->selinux_context = NULL;
1900
1901 free(c->apparmor_profile);
1902 c->apparmor_profile = NULL;
1903
1904 set_free(c->syscall_filter);
1905 c->syscall_filter = NULL;
1906
1907 set_free(c->syscall_archs);
1908 c->syscall_archs = NULL;
1909
1910 set_free(c->address_families);
1911 c->address_families = NULL;
1912
1913 strv_free(c->runtime_directory);
1914 c->runtime_directory = NULL;
1915 }
1916
1917 int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) {
1918 char **i;
1919
1920 assert(c);
1921
1922 if (!runtime_prefix)
1923 return 0;
1924
1925 STRV_FOREACH(i, c->runtime_directory) {
1926 _cleanup_free_ char *p;
1927
1928 p = strjoin(runtime_prefix, "/", *i, NULL);
1929 if (!p)
1930 return -ENOMEM;
1931
1932 /* We execute this synchronously, since we need to be
1933 * sure this is gone when we start the service
1934 * next. */
1935 rm_rf_dangerous(p, false, true, false);
1936 }
1937
1938 return 0;
1939 }
1940
1941 void exec_command_done(ExecCommand *c) {
1942 assert(c);
1943
1944 free(c->path);
1945 c->path = NULL;
1946
1947 strv_free(c->argv);
1948 c->argv = NULL;
1949 }
1950
1951 void exec_command_done_array(ExecCommand *c, unsigned n) {
1952 unsigned i;
1953
1954 for (i = 0; i < n; i++)
1955 exec_command_done(c+i);
1956 }
1957
1958 void exec_command_free_list(ExecCommand *c) {
1959 ExecCommand *i;
1960
1961 while ((i = c)) {
1962 LIST_REMOVE(command, c, i);
1963 exec_command_done(i);
1964 free(i);
1965 }
1966 }
1967
1968 void exec_command_free_array(ExecCommand **c, unsigned n) {
1969 unsigned i;
1970
1971 for (i = 0; i < n; i++) {
1972 exec_command_free_list(c[i]);
1973 c[i] = NULL;
1974 }
1975 }
1976
1977 int exec_context_load_environment(const ExecContext *c, char ***l) {
1978 char **i, **r = NULL;
1979
1980 assert(c);
1981 assert(l);
1982
1983 STRV_FOREACH(i, c->environment_files) {
1984 char *fn;
1985 int k;
1986 bool ignore = false;
1987 char **p;
1988 _cleanup_globfree_ glob_t pglob = {};
1989 int count, n;
1990
1991 fn = *i;
1992
1993 if (fn[0] == '-') {
1994 ignore = true;
1995 fn ++;
1996 }
1997
1998 if (!path_is_absolute(fn)) {
1999 if (ignore)
2000 continue;
2001
2002 strv_free(r);
2003 return -EINVAL;
2004 }
2005
2006 /* Filename supports globbing, take all matching files */
2007 errno = 0;
2008 if (glob(fn, 0, NULL, &pglob) != 0) {
2009 if (ignore)
2010 continue;
2011
2012 strv_free(r);
2013 return errno ? -errno : -EINVAL;
2014 }
2015 count = pglob.gl_pathc;
2016 if (count == 0) {
2017 if (ignore)
2018 continue;
2019
2020 strv_free(r);
2021 return -EINVAL;
2022 }
2023 for (n = 0; n < count; n++) {
2024 k = load_env_file(pglob.gl_pathv[n], NULL, &p);
2025 if (k < 0) {
2026 if (ignore)
2027 continue;
2028
2029 strv_free(r);
2030 return k;
2031 }
2032 /* Log invalid environment variables with filename */
2033 if (p)
2034 p = strv_env_clean_log(p, pglob.gl_pathv[n]);
2035
2036 if (r == NULL)
2037 r = p;
2038 else {
2039 char **m;
2040
2041 m = strv_env_merge(2, r, p);
2042 strv_free(r);
2043 strv_free(p);
2044 if (!m)
2045 return -ENOMEM;
2046
2047 r = m;
2048 }
2049 }
2050 }
2051
2052 *l = r;
2053
2054 return 0;
2055 }
2056
2057 static bool tty_may_match_dev_console(const char *tty) {
2058 char *active = NULL, *console;
2059 bool b;
2060
2061 if (startswith(tty, "/dev/"))
2062 tty += 5;
2063
2064 /* trivial identity? */
2065 if (streq(tty, "console"))
2066 return true;
2067
2068 console = resolve_dev_console(&active);
2069 /* if we could not resolve, assume it may */
2070 if (!console)
2071 return true;
2072
2073 /* "tty0" means the active VC, so it may be the same sometimes */
2074 b = streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty));
2075 free(active);
2076
2077 return b;
2078 }
2079
2080 bool exec_context_may_touch_console(ExecContext *ec) {
2081 return (ec->tty_reset || ec->tty_vhangup || ec->tty_vt_disallocate ||
2082 is_terminal_input(ec->std_input) ||
2083 is_terminal_output(ec->std_output) ||
2084 is_terminal_output(ec->std_error)) &&
2085 tty_may_match_dev_console(tty_path(ec));
2086 }
2087
2088 static void strv_fprintf(FILE *f, char **l) {
2089 char **g;
2090
2091 assert(f);
2092
2093 STRV_FOREACH(g, l)
2094 fprintf(f, " %s", *g);
2095 }
2096
2097 void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
2098 char **e;
2099 unsigned i;
2100
2101 assert(c);
2102 assert(f);
2103
2104 prefix = strempty(prefix);
2105
2106 fprintf(f,
2107 "%sUMask: %04o\n"
2108 "%sWorkingDirectory: %s\n"
2109 "%sRootDirectory: %s\n"
2110 "%sNonBlocking: %s\n"
2111 "%sPrivateTmp: %s\n"
2112 "%sPrivateNetwork: %s\n"
2113 "%sPrivateDevices: %s\n"
2114 "%sIgnoreSIGPIPE: %s\n",
2115 prefix, c->umask,
2116 prefix, c->working_directory ? c->working_directory : "/",
2117 prefix, c->root_directory ? c->root_directory : "/",
2118 prefix, yes_no(c->non_blocking),
2119 prefix, yes_no(c->private_tmp),
2120 prefix, yes_no(c->private_network),
2121 prefix, yes_no(c->private_devices),
2122 prefix, yes_no(c->ignore_sigpipe));
2123
2124 STRV_FOREACH(e, c->environment)
2125 fprintf(f, "%sEnvironment: %s\n", prefix, *e);
2126
2127 STRV_FOREACH(e, c->environment_files)
2128 fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e);
2129
2130 if (c->nice_set)
2131 fprintf(f,
2132 "%sNice: %i\n",
2133 prefix, c->nice);
2134
2135 if (c->oom_score_adjust_set)
2136 fprintf(f,
2137 "%sOOMScoreAdjust: %i\n",
2138 prefix, c->oom_score_adjust);
2139
2140 for (i = 0; i < RLIM_NLIMITS; i++)
2141 if (c->rlimit[i])
2142 fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
2143
2144 if (c->ioprio_set) {
2145 _cleanup_free_ char *class_str = NULL;
2146
2147 ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str);
2148 fprintf(f,
2149 "%sIOSchedulingClass: %s\n"
2150 "%sIOPriority: %i\n",
2151 prefix, strna(class_str),
2152 prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
2153 }
2154
2155 if (c->cpu_sched_set) {
2156 _cleanup_free_ char *policy_str = NULL;
2157
2158 sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str);
2159 fprintf(f,
2160 "%sCPUSchedulingPolicy: %s\n"
2161 "%sCPUSchedulingPriority: %i\n"
2162 "%sCPUSchedulingResetOnFork: %s\n",
2163 prefix, strna(policy_str),
2164 prefix, c->cpu_sched_priority,
2165 prefix, yes_no(c->cpu_sched_reset_on_fork));
2166 }
2167
2168 if (c->cpuset) {
2169 fprintf(f, "%sCPUAffinity:", prefix);
2170 for (i = 0; i < c->cpuset_ncpus; i++)
2171 if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset))
2172 fprintf(f, " %u", i);
2173 fputs("\n", f);
2174 }
2175
2176 if (c->timer_slack_nsec != (nsec_t) -1)
2177 fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec);
2178
2179 fprintf(f,
2180 "%sStandardInput: %s\n"
2181 "%sStandardOutput: %s\n"
2182 "%sStandardError: %s\n",
2183 prefix, exec_input_to_string(c->std_input),
2184 prefix, exec_output_to_string(c->std_output),
2185 prefix, exec_output_to_string(c->std_error));
2186
2187 if (c->tty_path)
2188 fprintf(f,
2189 "%sTTYPath: %s\n"
2190 "%sTTYReset: %s\n"
2191 "%sTTYVHangup: %s\n"
2192 "%sTTYVTDisallocate: %s\n",
2193 prefix, c->tty_path,
2194 prefix, yes_no(c->tty_reset),
2195 prefix, yes_no(c->tty_vhangup),
2196 prefix, yes_no(c->tty_vt_disallocate));
2197
2198 if (c->std_output == EXEC_OUTPUT_SYSLOG ||
2199 c->std_output == EXEC_OUTPUT_KMSG ||
2200 c->std_output == EXEC_OUTPUT_JOURNAL ||
2201 c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
2202 c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
2203 c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE ||
2204 c->std_error == EXEC_OUTPUT_SYSLOG ||
2205 c->std_error == EXEC_OUTPUT_KMSG ||
2206 c->std_error == EXEC_OUTPUT_JOURNAL ||
2207 c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
2208 c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
2209 c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) {
2210
2211 _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL;
2212
2213 log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str);
2214 log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str);
2215
2216 fprintf(f,
2217 "%sSyslogFacility: %s\n"
2218 "%sSyslogLevel: %s\n",
2219 prefix, strna(fac_str),
2220 prefix, strna(lvl_str));
2221 }
2222
2223 if (c->capabilities) {
2224 _cleanup_cap_free_charp_ char *t;
2225
2226 t = cap_to_text(c->capabilities, NULL);
2227 if (t)
2228 fprintf(f, "%sCapabilities: %s\n", prefix, t);
2229 }
2230
2231 if (c->secure_bits)
2232 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
2233 prefix,
2234 (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "",
2235 (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
2236 (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
2237 (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
2238 (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "",
2239 (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
2240
2241 if (c->capability_bounding_set_drop) {
2242 unsigned long l;
2243 fprintf(f, "%sCapabilityBoundingSet:", prefix);
2244
2245 for (l = 0; l <= cap_last_cap(); l++)
2246 if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) {
2247 _cleanup_cap_free_charp_ char *t;
2248
2249 t = cap_to_name(l);
2250 if (t)
2251 fprintf(f, " %s", t);
2252 }
2253
2254 fputs("\n", f);
2255 }
2256
2257 if (c->user)
2258 fprintf(f, "%sUser: %s\n", prefix, c->user);
2259 if (c->group)
2260 fprintf(f, "%sGroup: %s\n", prefix, c->group);
2261
2262 if (strv_length(c->supplementary_groups) > 0) {
2263 fprintf(f, "%sSupplementaryGroups:", prefix);
2264 strv_fprintf(f, c->supplementary_groups);
2265 fputs("\n", f);
2266 }
2267
2268 if (c->pam_name)
2269 fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name);
2270
2271 if (strv_length(c->read_write_dirs) > 0) {
2272 fprintf(f, "%sReadWriteDirs:", prefix);
2273 strv_fprintf(f, c->read_write_dirs);
2274 fputs("\n", f);
2275 }
2276
2277 if (strv_length(c->read_only_dirs) > 0) {
2278 fprintf(f, "%sReadOnlyDirs:", prefix);
2279 strv_fprintf(f, c->read_only_dirs);
2280 fputs("\n", f);
2281 }
2282
2283 if (strv_length(c->inaccessible_dirs) > 0) {
2284 fprintf(f, "%sInaccessibleDirs:", prefix);
2285 strv_fprintf(f, c->inaccessible_dirs);
2286 fputs("\n", f);
2287 }
2288
2289 if (c->utmp_id)
2290 fprintf(f,
2291 "%sUtmpIdentifier: %s\n",
2292 prefix, c->utmp_id);
2293
2294 if (c->selinux_context)
2295 fprintf(f,
2296 "%sSELinuxContext: %s%s\n",
2297 prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context);
2298
2299 if (c->personality != 0xffffffffUL)
2300 fprintf(f,
2301 "%sPersonality: %s\n",
2302 prefix, strna(personality_to_string(c->personality)));
2303
2304 if (c->syscall_filter) {
2305 #ifdef HAVE_SECCOMP
2306 Iterator j;
2307 void *id;
2308 bool first = true;
2309 #endif
2310
2311 fprintf(f,
2312 "%sSystemCallFilter: ",
2313 prefix);
2314
2315 if (!c->syscall_whitelist)
2316 fputc('~', f);
2317
2318 #ifdef HAVE_SECCOMP
2319 SET_FOREACH(id, c->syscall_filter, j) {
2320 _cleanup_free_ char *name = NULL;
2321
2322 if (first)
2323 first = false;
2324 else
2325 fputc(' ', f);
2326
2327 name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1);
2328 fputs(strna(name), f);
2329 }
2330 #endif
2331
2332 fputc('\n', f);
2333 }
2334
2335 if (c->syscall_archs) {
2336 #ifdef HAVE_SECCOMP
2337 Iterator j;
2338 void *id;
2339 #endif
2340
2341 fprintf(f,
2342 "%sSystemCallArchitectures:",
2343 prefix);
2344
2345 #ifdef HAVE_SECCOMP
2346 SET_FOREACH(id, c->syscall_archs, j)
2347 fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1)));
2348 #endif
2349 fputc('\n', f);
2350 }
2351
2352 if (c->syscall_errno != 0)
2353 fprintf(f,
2354 "%sSystemCallErrorNumber: %s\n",
2355 prefix, strna(errno_to_name(c->syscall_errno)));
2356
2357 if (c->apparmor_profile)
2358 fprintf(f,
2359 "%sAppArmorProfile: %s%s\n",
2360 prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile);
2361 }
2362
2363 void exec_status_start(ExecStatus *s, pid_t pid) {
2364 assert(s);
2365
2366 zero(*s);
2367 s->pid = pid;
2368 dual_timestamp_get(&s->start_timestamp);
2369 }
2370
2371 void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) {
2372 assert(s);
2373
2374 if (s->pid && s->pid != pid)
2375 zero(*s);
2376
2377 s->pid = pid;
2378 dual_timestamp_get(&s->exit_timestamp);
2379
2380 s->code = code;
2381 s->status = status;
2382
2383 if (context) {
2384 if (context->utmp_id)
2385 utmp_put_dead_process(context->utmp_id, pid, code, status);
2386
2387 exec_context_tty_reset(context);
2388 }
2389 }
2390
2391 void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
2392 char buf[FORMAT_TIMESTAMP_MAX];
2393
2394 assert(s);
2395 assert(f);
2396
2397 if (!prefix)
2398 prefix = "";
2399
2400 if (s->pid <= 0)
2401 return;
2402
2403 fprintf(f,
2404 "%sPID: "PID_FMT"\n",
2405 prefix, s->pid);
2406
2407 if (s->start_timestamp.realtime > 0)
2408 fprintf(f,
2409 "%sStart Timestamp: %s\n",
2410 prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime));
2411
2412 if (s->exit_timestamp.realtime > 0)
2413 fprintf(f,
2414 "%sExit Timestamp: %s\n"
2415 "%sExit Code: %s\n"
2416 "%sExit Status: %i\n",
2417 prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime),
2418 prefix, sigchld_code_to_string(s->code),
2419 prefix, s->status);
2420 }
2421
2422 char *exec_command_line(char **argv) {
2423 size_t k;
2424 char *n, *p, **a;
2425 bool first = true;
2426
2427 assert(argv);
2428
2429 k = 1;
2430 STRV_FOREACH(a, argv)
2431 k += strlen(*a)+3;
2432
2433 if (!(n = new(char, k)))
2434 return NULL;
2435
2436 p = n;
2437 STRV_FOREACH(a, argv) {
2438
2439 if (!first)
2440 *(p++) = ' ';
2441 else
2442 first = false;
2443
2444 if (strpbrk(*a, WHITESPACE)) {
2445 *(p++) = '\'';
2446 p = stpcpy(p, *a);
2447 *(p++) = '\'';
2448 } else
2449 p = stpcpy(p, *a);
2450
2451 }
2452
2453 *p = 0;
2454
2455 /* FIXME: this doesn't really handle arguments that have
2456 * spaces and ticks in them */
2457
2458 return n;
2459 }
2460
2461 void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
2462 char *p2;
2463 const char *prefix2;
2464
2465 char *cmd;
2466
2467 assert(c);
2468 assert(f);
2469
2470 if (!prefix)
2471 prefix = "";
2472 p2 = strappend(prefix, "\t");
2473 prefix2 = p2 ? p2 : prefix;
2474
2475 cmd = exec_command_line(c->argv);
2476
2477 fprintf(f,
2478 "%sCommand Line: %s\n",
2479 prefix, cmd ? cmd : strerror(ENOMEM));
2480
2481 free(cmd);
2482
2483 exec_status_dump(&c->exec_status, f, prefix2);
2484
2485 free(p2);
2486 }
2487
2488 void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
2489 assert(f);
2490
2491 if (!prefix)
2492 prefix = "";
2493
2494 LIST_FOREACH(command, c, c)
2495 exec_command_dump(c, f, prefix);
2496 }
2497
2498 void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
2499 ExecCommand *end;
2500
2501 assert(l);
2502 assert(e);
2503
2504 if (*l) {
2505 /* It's kind of important, that we keep the order here */
2506 LIST_FIND_TAIL(command, *l, end);
2507 LIST_INSERT_AFTER(command, *l, end, e);
2508 } else
2509 *l = e;
2510 }
2511
2512 int exec_command_set(ExecCommand *c, const char *path, ...) {
2513 va_list ap;
2514 char **l, *p;
2515
2516 assert(c);
2517 assert(path);
2518
2519 va_start(ap, path);
2520 l = strv_new_ap(path, ap);
2521 va_end(ap);
2522
2523 if (!l)
2524 return -ENOMEM;
2525
2526 p = strdup(path);
2527 if (!p) {
2528 strv_free(l);
2529 return -ENOMEM;
2530 }
2531
2532 free(c->path);
2533 c->path = p;
2534
2535 strv_free(c->argv);
2536 c->argv = l;
2537
2538 return 0;
2539 }
2540
2541 static int exec_runtime_allocate(ExecRuntime **rt) {
2542
2543 if (*rt)
2544 return 0;
2545
2546 *rt = new0(ExecRuntime, 1);
2547 if (!*rt)
2548 return -ENOMEM;
2549
2550 (*rt)->n_ref = 1;
2551 (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1;
2552
2553 return 0;
2554 }
2555
2556 int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) {
2557 int r;
2558
2559 assert(rt);
2560 assert(c);
2561 assert(id);
2562
2563 if (*rt)
2564 return 1;
2565
2566 if (!c->private_network && !c->private_tmp)
2567 return 0;
2568
2569 r = exec_runtime_allocate(rt);
2570 if (r < 0)
2571 return r;
2572
2573 if (c->private_network && (*rt)->netns_storage_socket[0] < 0) {
2574 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, (*rt)->netns_storage_socket) < 0)
2575 return -errno;
2576 }
2577
2578 if (c->private_tmp && !(*rt)->tmp_dir) {
2579 r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir);
2580 if (r < 0)
2581 return r;
2582 }
2583
2584 return 1;
2585 }
2586
2587 ExecRuntime *exec_runtime_ref(ExecRuntime *r) {
2588 assert(r);
2589 assert(r->n_ref > 0);
2590
2591 r->n_ref++;
2592 return r;
2593 }
2594
2595 ExecRuntime *exec_runtime_unref(ExecRuntime *r) {
2596
2597 if (!r)
2598 return NULL;
2599
2600 assert(r->n_ref > 0);
2601
2602 r->n_ref--;
2603 if (r->n_ref <= 0) {
2604 free(r->tmp_dir);
2605 free(r->var_tmp_dir);
2606 safe_close_pair(r->netns_storage_socket);
2607 free(r);
2608 }
2609
2610 return NULL;
2611 }
2612
2613 int exec_runtime_serialize(ExecRuntime *rt, Unit *u, FILE *f, FDSet *fds) {
2614 assert(u);
2615 assert(f);
2616 assert(fds);
2617
2618 if (!rt)
2619 return 0;
2620
2621 if (rt->tmp_dir)
2622 unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir);
2623
2624 if (rt->var_tmp_dir)
2625 unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir);
2626
2627 if (rt->netns_storage_socket[0] >= 0) {
2628 int copy;
2629
2630 copy = fdset_put_dup(fds, rt->netns_storage_socket[0]);
2631 if (copy < 0)
2632 return copy;
2633
2634 unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy);
2635 }
2636
2637 if (rt->netns_storage_socket[1] >= 0) {
2638 int copy;
2639
2640 copy = fdset_put_dup(fds, rt->netns_storage_socket[1]);
2641 if (copy < 0)
2642 return copy;
2643
2644 unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy);
2645 }
2646
2647 return 0;
2648 }
2649
2650 int exec_runtime_deserialize_item(ExecRuntime **rt, Unit *u, const char *key, const char *value, FDSet *fds) {
2651 int r;
2652
2653 assert(rt);
2654 assert(key);
2655 assert(value);
2656
2657 if (streq(key, "tmp-dir")) {
2658 char *copy;
2659
2660 r = exec_runtime_allocate(rt);
2661 if (r < 0)
2662 return r;
2663
2664 copy = strdup(value);
2665 if (!copy)
2666 return log_oom();
2667
2668 free((*rt)->tmp_dir);
2669 (*rt)->tmp_dir = copy;
2670
2671 } else if (streq(key, "var-tmp-dir")) {
2672 char *copy;
2673
2674 r = exec_runtime_allocate(rt);
2675 if (r < 0)
2676 return r;
2677
2678 copy = strdup(value);
2679 if (!copy)
2680 return log_oom();
2681
2682 free((*rt)->var_tmp_dir);
2683 (*rt)->var_tmp_dir = copy;
2684
2685 } else if (streq(key, "netns-socket-0")) {
2686 int fd;
2687
2688 r = exec_runtime_allocate(rt);
2689 if (r < 0)
2690 return r;
2691
2692 if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
2693 log_debug_unit(u->id, "Failed to parse netns socket value %s", value);
2694 else {
2695 safe_close((*rt)->netns_storage_socket[0]);
2696 (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd);
2697 }
2698 } else if (streq(key, "netns-socket-1")) {
2699 int fd;
2700
2701 r = exec_runtime_allocate(rt);
2702 if (r < 0)
2703 return r;
2704
2705 if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
2706 log_debug_unit(u->id, "Failed to parse netns socket value %s", value);
2707 else {
2708 safe_close((*rt)->netns_storage_socket[1]);
2709 (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd);
2710 }
2711 } else
2712 return 0;
2713
2714 return 1;
2715 }
2716
2717 static void *remove_tmpdir_thread(void *p) {
2718 _cleanup_free_ char *path = p;
2719
2720 rm_rf_dangerous(path, false, true, false);
2721 return NULL;
2722 }
2723
2724 void exec_runtime_destroy(ExecRuntime *rt) {
2725 int r;
2726
2727 if (!rt)
2728 return;
2729
2730 /* If there are multiple users of this, let's leave the stuff around */
2731 if (rt->n_ref > 1)
2732 return;
2733
2734 if (rt->tmp_dir) {
2735 log_debug("Spawning thread to nuke %s", rt->tmp_dir);
2736
2737 r = asynchronous_job(remove_tmpdir_thread, rt->tmp_dir);
2738 if (r < 0) {
2739 log_warning("Failed to nuke %s: %s", rt->tmp_dir, strerror(-r));
2740 free(rt->tmp_dir);
2741 }
2742
2743 rt->tmp_dir = NULL;
2744 }
2745
2746 if (rt->var_tmp_dir) {
2747 log_debug("Spawning thread to nuke %s", rt->var_tmp_dir);
2748
2749 r = asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir);
2750 if (r < 0) {
2751 log_warning("Failed to nuke %s: %s", rt->var_tmp_dir, strerror(-r));
2752 free(rt->var_tmp_dir);
2753 }
2754
2755 rt->var_tmp_dir = NULL;
2756 }
2757
2758 safe_close_pair(rt->netns_storage_socket);
2759 }
2760
2761 static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
2762 [EXEC_INPUT_NULL] = "null",
2763 [EXEC_INPUT_TTY] = "tty",
2764 [EXEC_INPUT_TTY_FORCE] = "tty-force",
2765 [EXEC_INPUT_TTY_FAIL] = "tty-fail",
2766 [EXEC_INPUT_SOCKET] = "socket"
2767 };
2768
2769 DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
2770
2771 static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
2772 [EXEC_OUTPUT_INHERIT] = "inherit",
2773 [EXEC_OUTPUT_NULL] = "null",
2774 [EXEC_OUTPUT_TTY] = "tty",
2775 [EXEC_OUTPUT_SYSLOG] = "syslog",
2776 [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console",
2777 [EXEC_OUTPUT_KMSG] = "kmsg",
2778 [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console",
2779 [EXEC_OUTPUT_JOURNAL] = "journal",
2780 [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console",
2781 [EXEC_OUTPUT_SOCKET] = "socket"
2782 };
2783
2784 DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
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