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