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d6c9574f 1/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
5cb5a6ff 2
a7334b09
LP		 3/***
4 This file is part of systemd.
5
6 Copyright 2010 Lennart Poettering
7
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20***/
21
5cb5a6ff 22#include <assert.h>
034c6ed7
LP		 23#include <dirent.h>
24#include <errno.h>
25#include <fcntl.h>
26#include <unistd.h>
44d8db9e 27#include <string.h>
309bff19 28#include <signal.h>
071830ff
LP		 29#include <sys/socket.h>
30#include <sys/un.h>
94f04347 31#include <sys/prctl.h>
66ee3769 32#include <linux/sched.h>
451a074f
LP		 33#include <sys/types.h>
34#include <sys/stat.h>
81a2b7ce
LP		 35#include <grp.h>
36#include <pwd.h>
15ae422b 37#include <sys/mount.h>
25e870b5 38#include <linux/fs.h>
dd6c17b1 39#include <linux/oom.h>
5cb5a6ff 40
5b6319dc
LP		 41#ifdef HAVE_PAM
42#include <security/pam_appl.h>
43#endif
44
5cb5a6ff
LP		 45#include "execute.h"
46#include "strv.h"
47#include "macro.h"
d7832d2c 48#include "capability.h"
5cb5a6ff 49#include "util.h"
acbb0225 50#include "log.h"
9eba9da4 51#include "ioprio.h"
94f04347 52#include "securebits.h"
8e274523 53#include "cgroup.h"
15ae422b 54#include "namespace.h"
df1f0afe 55#include "tcpwrap.h"
d06dacd0 56#include "exit-status.h"
dd6c17b1 57#include "missing.h"
169c1bda 58#include "utmp-wtmp.h"
f6a6225e 59#include "def.h"
ff01d048 60#include "loopback-setup.h"
5cb5a6ff 61
02a51aba
LP		 62/* This assumes there is a 'tty' group */
63#define TTY_MODE 0620
64
034c6ed7
LP		 65static int shift_fds(int fds[], unsigned n_fds) {
66 int start, restart_from;
67
68 if (n_fds <= 0)
69 return 0;
70
a0d40ac5
LP		 71 /* Modifies the fds array! (sorts it) */
72
034c6ed7
LP		 73 assert(fds);
74
75 start = 0;
76 for (;;) {
77 int i;
78
79 restart_from = -1;
80
81 for (i = start; i < (int) n_fds; i++) {
82 int nfd;
83
84 /* Already at right index? */
85 if (fds[i] == i+3)
86 continue;
87
88 if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
89 return -errno;
90
e1f5e051 91 close_nointr_nofail(fds[i]);
034c6ed7
LP		 92 fds[i] = nfd;
93
94 /* Hmm, the fd we wanted isn't free? Then
95 * let's remember that and try again from here*/
96 if (nfd != i+3 && restart_from < 0)
97 restart_from = i;
98 }
99
100 if (restart_from < 0)
101 break;
102
103 start = restart_from;
104 }
105
106 return 0;
107}
108
c2748801 109static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) {
47a71eed 110 unsigned i;
e2c76839 111 int r;
47a71eed
LP		 112
113 if (n_fds <= 0)
114 return 0;
115
116 assert(fds);
117
451a074f 118 /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
47a71eed
LP		 119
120 for (i = 0; i < n_fds; i++) {
47a71eed 121
e2c76839
LP		 122 if ((r = fd_nonblock(fds[i], nonblock)) < 0)
123 return r;
47a71eed 124
451a074f
LP		 125 /* We unconditionally drop FD_CLOEXEC from the fds,
126 * since after all we want to pass these fds to our
127 * children */
47a71eed 128
e2c76839
LP		 129 if ((r = fd_cloexec(fds[i], false)) < 0)
130 return r;
47a71eed
LP		 131 }
132
133 return 0;
134}
135
80876c20
LP		 136static const char *tty_path(const ExecContext *context) {
137 assert(context);
138
139 if (context->tty_path)
140 return context->tty_path;
141
142 return "/dev/console";
143}
144
6ea832a2
LP		 145void exec_context_tty_reset(const ExecContext *context) {
146 assert(context);
147
148 if (context->tty_vhangup)
149 terminal_vhangup(tty_path(context));
150
151 if (context->tty_reset)
152 reset_terminal(tty_path(context));
153
154 if (context->tty_vt_disallocate && context->tty_path)
155 vt_disallocate(context->tty_path);
156}
157
80876c20
LP		 158static int open_null_as(int flags, int nfd) {
159 int fd, r;
071830ff 160
80876c20 161 assert(nfd >= 0);
071830ff 162
80876c20 163 if ((fd = open("/dev/null", flags|O_NOCTTY)) < 0)
071830ff
LP		 164 return -errno;
165
80876c20
LP		 166 if (fd != nfd) {
167 r = dup2(fd, nfd) < 0 ? -errno : nfd;
e1f5e051 168 close_nointr_nofail(fd);
80876c20
LP		 169 } else
170 r = nfd;
071830ff 171
80876c20 172 return r;
071830ff
LP		 173}
174
80876c20
LP		 175static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, int nfd) {
176 int fd, r;
54fe0cdb 177 union sockaddr_union sa;
071830ff
LP		 178
179 assert(context);
80876c20
LP		 180 assert(output < _EXEC_OUTPUT_MAX);
181 assert(ident);
182 assert(nfd >= 0);
071830ff 183
54fe0cdb
LP		 184 fd = socket(AF_UNIX, SOCK_STREAM, 0);
185 if (fd < 0)
80876c20 186 return -errno;
071830ff 187
80876c20 188 zero(sa);
54fe0cdb
LP		 189 sa.un.sun_family = AF_UNIX;
190 strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path));
071830ff 191
54fe0cdb
LP		 192 r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
193 if (r < 0) {
80876c20
LP		 194 close_nointr_nofail(fd);
195 return -errno;
196 }
071830ff 197
80876c20
LP		 198 if (shutdown(fd, SHUT_RD) < 0) {
199 close_nointr_nofail(fd);
200 return -errno;
201 }
071830ff 202
80876c20
LP		 203 dprintf(fd,
204 "%s\n"
205 "%i\n"
54fe0cdb
LP		 206 "%i\n"
207 "%i\n"
208 "%i\n"
4f4a1dbf 209 "%i\n",
4f4a1dbf 210 context->syslog_identifier ? context->syslog_identifier : ident,
54fe0cdb
LP		 211 context->syslog_priority,
212 !!context->syslog_level_prefix,
213 output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE,
214 output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE,
706343f4 215 output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || output == EXEC_OUTPUT_KMSG_AND_CONSOLE || output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE);
80876c20
LP		 216
217 if (fd != nfd) {
218 r = dup2(fd, nfd) < 0 ? -errno : nfd;
e1f5e051 219 close_nointr_nofail(fd);
80876c20
LP		 220 } else
221 r = nfd;
071830ff 222
80876c20
LP		 223 return r;
224}
225static int open_terminal_as(const char *path, mode_t mode, int nfd) {
226 int fd, r;
071830ff 227
80876c20
LP		 228 assert(path);
229 assert(nfd >= 0);
071830ff 230
80876c20
LP		 231 if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
232 return fd;
071830ff 233
80876c20
LP		 234 if (fd != nfd) {
235 r = dup2(fd, nfd) < 0 ? -errno : nfd;
236 close_nointr_nofail(fd);
237 } else
238 r = nfd;
071830ff 239
80876c20
LP		 240 return r;
241}
071830ff 242
80876c20
LP		 243static bool is_terminal_input(ExecInput i) {
244 return
245 i == EXEC_INPUT_TTY ||
246 i == EXEC_INPUT_TTY_FORCE ||
247 i == EXEC_INPUT_TTY_FAIL;
248}
071830ff 249
1e3ad081
LP		 250static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) {
251
252 if (is_terminal_input(std_input) && !apply_tty_stdin)
253 return EXEC_INPUT_NULL;
071830ff 254
03fd9c49 255 if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 256 return EXEC_INPUT_NULL;
257
03fd9c49 258 return std_input;
4f2d528d
LP		 259}
260
03fd9c49 261static int fixup_output(ExecOutput std_output, int socket_fd) {
4f2d528d 262
03fd9c49 263 if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 264 return EXEC_OUTPUT_INHERIT;
265
03fd9c49 266 return std_output;
4f2d528d
LP		 267}
268
1e3ad081 269static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) {
4f2d528d
LP		 270 ExecInput i;
271
272 assert(context);
273
1e3ad081 274 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
4f2d528d
LP		 275
276 switch (i) {
071830ff 277
80876c20
LP		 278 case EXEC_INPUT_NULL:
279 return open_null_as(O_RDONLY, STDIN_FILENO);
280
281 case EXEC_INPUT_TTY:
282 case EXEC_INPUT_TTY_FORCE:
283 case EXEC_INPUT_TTY_FAIL: {
284 int fd, r;
071830ff 285
80876c20
LP		 286 if ((fd = acquire_terminal(
287 tty_path(context),
4f2d528d 288 i == EXEC_INPUT_TTY_FAIL,
21de3988
LP		 289 i == EXEC_INPUT_TTY_FORCE,
290 false)) < 0)
80876c20
LP		 291 return fd;
292
293 if (fd != STDIN_FILENO) {
294 r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
071830ff 295 close_nointr_nofail(fd);
80876c20
LP		 296 } else
297 r = STDIN_FILENO;
298
299 return r;
300 }
301
4f2d528d
LP		 302 case EXEC_INPUT_SOCKET:
303 return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
304
80876c20
LP		 305 default:
306 assert_not_reached("Unknown input type");
307 }
308}
309
1e3ad081 310static int setup_output(const ExecContext *context, int socket_fd, const char *ident, bool apply_tty_stdin) {
4f2d528d
LP		 311 ExecOutput o;
312 ExecInput i;
313
80876c20
LP		 314 assert(context);
315 assert(ident);
316
1e3ad081 317 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
03fd9c49 318 o = fixup_output(context->std_output, socket_fd);
4f2d528d 319
80876c20
LP		 320 /* This expects the input is already set up */
321
4f2d528d 322 switch (o) {
071830ff 323
80876c20
LP		 324 case EXEC_OUTPUT_INHERIT:
325
21d21ea4
LP		 326 /* If input got downgraded, inherit the original value */
327 if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input))
328 return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
329
acb591e4 330 /* If the input is connected to anything that's not a /dev/null, inherit that... */
ff876e28 331 if (i != EXEC_INPUT_NULL)
80876c20 332 return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
071830ff 333
acb591e4
LP		 334 /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */
335 if (getppid() != 1)
336 return STDOUT_FILENO;
ff876e28 337
acb591e4
LP		 338 /* We need to open /dev/null here anew, to get the
339 * right access mode. So we fall through */
80876c20
LP		 340
341 case EXEC_OUTPUT_NULL:
342 return open_null_as(O_WRONLY, STDOUT_FILENO);
343
4f2d528d
LP		 344 case EXEC_OUTPUT_TTY:
345 if (is_terminal_input(i))
80876c20
LP		 346 return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
347
348 /* We don't reset the terminal if this is just about output */
349 return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
94f04347 350
80876c20 351 case EXEC_OUTPUT_SYSLOG:
28dbc1e8 352 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
9a6bca7a 353 case EXEC_OUTPUT_KMSG:
28dbc1e8 354 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
706343f4
LP		 355 case EXEC_OUTPUT_JOURNAL:
356 case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
4f2d528d
LP		 357 return connect_logger_as(context, o, ident, STDOUT_FILENO);
358
359 case EXEC_OUTPUT_SOCKET:
360 assert(socket_fd >= 0);
361 return dup2(socket_fd, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
80876c20 362
94f04347
LP		 363 default:
364 assert_not_reached("Unknown output type");
071830ff 365 }
94f04347
LP		 366}
367
1e3ad081 368static int setup_error(const ExecContext *context, int socket_fd, const char *ident, bool apply_tty_stdin) {
4f2d528d
LP		 369 ExecOutput o, e;
370 ExecInput i;
371
94f04347 372 assert(context);
02a51aba 373 assert(ident);
071830ff 374
1e3ad081 375 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
03fd9c49
LP		 376 o = fixup_output(context->std_output, socket_fd);
377 e = fixup_output(context->std_error, socket_fd);
4f2d528d 378
80876c20 379 /* This expects the input and output are already set up */
94f04347 380
80876c20
LP		 381 /* Don't change the stderr file descriptor if we inherit all
382 * the way and are not on a tty */
4f2d528d
LP		 383 if (e == EXEC_OUTPUT_INHERIT &&
384 o == EXEC_OUTPUT_INHERIT &&
acb591e4 385 i == EXEC_INPUT_NULL &&
21d21ea4 386 !is_terminal_input(context->std_input) &&
dec5d552 387 getppid () != 1)
80876c20 388 return STDERR_FILENO;
94f04347 389
21d21ea4 390 /* Duplicate from stdout if possible */
4f2d528d 391 if (e == o || e == EXEC_OUTPUT_INHERIT)
80876c20 392 return dup2(STDOUT_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
94f04347 393
4f2d528d 394 switch (e) {
80876c20
LP		 395
396 case EXEC_OUTPUT_NULL:
397 return open_null_as(O_WRONLY, STDERR_FILENO);
398
399 case EXEC_OUTPUT_TTY:
4f2d528d 400 if (is_terminal_input(i))
80876c20
LP		 401 return dup2(STDIN_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
402
403 /* We don't reset the terminal if this is just about output */
404 return open_terminal_as(tty_path(context), O_WRONLY, STDERR_FILENO);
405
406 case EXEC_OUTPUT_SYSLOG:
28dbc1e8 407 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
9a6bca7a 408 case EXEC_OUTPUT_KMSG:
28dbc1e8 409 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
706343f4
LP		 410 case EXEC_OUTPUT_JOURNAL:
411 case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
4f2d528d
LP		 412 return connect_logger_as(context, e, ident, STDERR_FILENO);
413
414 case EXEC_OUTPUT_SOCKET:
415 assert(socket_fd >= 0);
416 return dup2(socket_fd, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
94f04347
LP		 417
418 default:
80876c20 419 assert_not_reached("Unknown error type");
94f04347 420 }
071830ff
LP		 421}
422
02a51aba
LP		 423static int chown_terminal(int fd, uid_t uid) {
424 struct stat st;
425
426 assert(fd >= 0);
02a51aba
LP		 427
428 /* This might fail. What matters are the results. */
bab45044
LP		 429 (void) fchown(fd, uid, -1);
430 (void) fchmod(fd, TTY_MODE);
02a51aba
LP		 431
432 if (fstat(fd, &st) < 0)
433 return -errno;
434
d8b4e2e9 435 if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
02a51aba
LP		 436 return -EPERM;
437
438 return 0;
439}
440
80876c20
LP		 441static int setup_confirm_stdio(const ExecContext *context,
442 int *_saved_stdin,
443 int *_saved_stdout) {
444 int fd = -1, saved_stdin, saved_stdout = -1, r;
445
446 assert(context);
447 assert(_saved_stdin);
448 assert(_saved_stdout);
449
450 /* This returns positive EXIT_xxx return values instead of
451 * negative errno style values! */
452
453 if ((saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3)) < 0)
454 return EXIT_STDIN;
455
456 if ((saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3)) < 0) {
457 r = EXIT_STDOUT;
458 goto fail;
459 }
460
461 if ((fd = acquire_terminal(
462 tty_path(context),
463 context->std_input == EXEC_INPUT_TTY_FAIL,
21de3988
LP		 464 context->std_input == EXEC_INPUT_TTY_FORCE,
465 false)) < 0) {
80876c20
LP		 466 r = EXIT_STDIN;
467 goto fail;
468 }
469
02a51aba
LP		 470 if (chown_terminal(fd, getuid()) < 0) {
471 r = EXIT_STDIN;
472 goto fail;
473 }
474
80876c20
LP		 475 if (dup2(fd, STDIN_FILENO) < 0) {
476 r = EXIT_STDIN;
477 goto fail;
478 }
479
480 if (dup2(fd, STDOUT_FILENO) < 0) {
481 r = EXIT_STDOUT;
482 goto fail;
483 }
484
485 if (fd >= 2)
486 close_nointr_nofail(fd);
487
488 *_saved_stdin = saved_stdin;
489 *_saved_stdout = saved_stdout;
490
491 return 0;
492
493fail:
494 if (saved_stdout >= 0)
495 close_nointr_nofail(saved_stdout);
496
497 if (saved_stdin >= 0)
498 close_nointr_nofail(saved_stdin);
499
500 if (fd >= 0)
501 close_nointr_nofail(fd);
502
503 return r;
504}
505
2608882f 506static int restore_confirm_stdio(const ExecContext *context,
80876c20
LP		 507 int *saved_stdin,
508 int *saved_stdout,
509 bool *keep_stdin,
510 bool *keep_stdout) {
511
512 assert(context);
513 assert(saved_stdin);
514 assert(*saved_stdin >= 0);
515 assert(saved_stdout);
516 assert(*saved_stdout >= 0);
517
518 /* This returns positive EXIT_xxx return values instead of
519 * negative errno style values! */
520
521 if (is_terminal_input(context->std_input)) {
522
523 /* The service wants terminal input. */
524
525 *keep_stdin = true;
526 *keep_stdout =
527 context->std_output == EXEC_OUTPUT_INHERIT ||
528 context->std_output == EXEC_OUTPUT_TTY;
529
530 } else {
531 /* If the service doesn't want a controlling terminal,
532 * then we need to get rid entirely of what we have
533 * already. */
534
535 if (release_terminal() < 0)
536 return EXIT_STDIN;
537
538 if (dup2(*saved_stdin, STDIN_FILENO) < 0)
539 return EXIT_STDIN;
540
541 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
542 return EXIT_STDOUT;
543
544 *keep_stdout = *keep_stdin = false;
545 }
546
547 return 0;
548}
549
81a2b7ce
LP		 550static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
551 bool keep_groups = false;
552 int r;
553
554 assert(context);
555
35b8ca3a 556 /* Lookup and set GID and supplementary group list. Here too
81a2b7ce
LP		 557 * we avoid NSS lookups for gid=0. */
558
559 if (context->group || username) {
560
4b67834e
LP		 561 if (context->group) {
562 const char *g = context->group;
563
564 if ((r = get_group_creds(&g, &gid)) < 0)
81a2b7ce 565 return r;
4b67834e 566 }
81a2b7ce
LP		 567
568 /* First step, initialize groups from /etc/groups */
569 if (username && gid != 0) {
570 if (initgroups(username, gid) < 0)
571 return -errno;
572
573 keep_groups = true;
574 }
575
576 /* Second step, set our gids */
577 if (setresgid(gid, gid, gid) < 0)
578 return -errno;
579 }
580
581 if (context->supplementary_groups) {
582 int ngroups_max, k;
583 gid_t *gids;
584 char **i;
585
586 /* Final step, initialize any manually set supplementary groups */
da19d5c1 587 assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0);
81a2b7ce
LP		 588
589 if (!(gids = new(gid_t, ngroups_max)))
590 return -ENOMEM;
591
592 if (keep_groups) {
593 if ((k = getgroups(ngroups_max, gids)) < 0) {
594 free(gids);
595 return -errno;
596 }
597 } else
598 k = 0;
599
600 STRV_FOREACH(i, context->supplementary_groups) {
4b67834e 601 const char *g;
81a2b7ce
LP		 602
603 if (k >= ngroups_max) {
604 free(gids);
605 return -E2BIG;
606 }
607
4b67834e
LP		 608 g = *i;
609 r = get_group_creds(&g, gids+k);
610 if (r < 0) {
81a2b7ce
LP		 611 free(gids);
612 return r;
613 }
614
615 k++;
616 }
617
618 if (setgroups(k, gids) < 0) {
619 free(gids);
620 return -errno;
621 }
622
623 free(gids);
624 }
625
626 return 0;
627}
628
629static int enforce_user(const ExecContext *context, uid_t uid) {
630 int r;
631 assert(context);
632
633 /* Sets (but doesn't lookup) the uid and make sure we keep the
634 * capabilities while doing so. */
635
636 if (context->capabilities) {
637 cap_t d;
638 static const cap_value_t bits[] = {
639 CAP_SETUID, /* Necessary so that we can run setresuid() below */
640 CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */
641 };
642
643 /* First step: If we need to keep capabilities but
644 * drop privileges we need to make sure we keep our
35b8ca3a 645 * caps, whiel we drop privileges. */
693ced48
LP		 646 if (uid != 0) {
647 int sb = context->secure_bits|SECURE_KEEP_CAPS;
648
649 if (prctl(PR_GET_SECUREBITS) != sb)
650 if (prctl(PR_SET_SECUREBITS, sb) < 0)
651 return -errno;
652 }
81a2b7ce 653
35b8ca3a 654 /* Second step: set the capabilities. This will reduce
81a2b7ce
LP		 655 * the capabilities to the minimum we need. */
656
657 if (!(d = cap_dup(context->capabilities)))
658 return -errno;
659
660 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
661 cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) {
662 r = -errno;
663 cap_free(d);
664 return r;
665 }
666
667 if (cap_set_proc(d) < 0) {
668 r = -errno;
669 cap_free(d);
670 return r;
671 }
672
673 cap_free(d);
674 }
675
676 /* Third step: actually set the uids */
677 if (setresuid(uid, uid, uid) < 0)
678 return -errno;
679
680 /* At this point we should have all necessary capabilities but
681 are otherwise a normal user. However, the caps might got
682 corrupted due to the setresuid() so we need clean them up
683 later. This is done outside of this call. */
684
685 return 0;
686}
687
5b6319dc
LP		 688#ifdef HAVE_PAM
689
690static int null_conv(
691 int num_msg,
692 const struct pam_message **msg,
693 struct pam_response **resp,
694 void *appdata_ptr) {
695
696 /* We don't support conversations */
697
698 return PAM_CONV_ERR;
699}
700
701static int setup_pam(
702 const char *name,
703 const char *user,
704 const char *tty,
705 char ***pam_env,
706 int fds[], unsigned n_fds) {
707
708 static const struct pam_conv conv = {
709 .conv = null_conv,
710 .appdata_ptr = NULL
711 };
712
713 pam_handle_t *handle = NULL;
714 sigset_t ss, old_ss;
715 int pam_code = PAM_SUCCESS;
9ba35398 716 int err;
5b6319dc
LP		 717 char **e = NULL;
718 bool close_session = false;
719 pid_t pam_pid = 0, parent_pid;
720
721 assert(name);
722 assert(user);
723 assert(pam_env);
724
725 /* We set up PAM in the parent process, then fork. The child
35b8ca3a 726 * will then stay around until killed via PR_GET_PDEATHSIG or
5b6319dc
LP		 727 * systemd via the cgroup logic. It will then remove the PAM
728 * session again. The parent process will exec() the actual
729 * daemon. We do things this way to ensure that the main PID
730 * of the daemon is the one we initially fork()ed. */
731
732 if ((pam_code = pam_start(name, user, &conv, &handle)) != PAM_SUCCESS) {
733 handle = NULL;
734 goto fail;
735 }
736
737 if (tty)
738 if ((pam_code = pam_set_item(handle, PAM_TTY, tty)) != PAM_SUCCESS)
739 goto fail;
740
741 if ((pam_code = pam_acct_mgmt(handle, PAM_SILENT)) != PAM_SUCCESS)
742 goto fail;
743
744 if ((pam_code = pam_open_session(handle, PAM_SILENT)) != PAM_SUCCESS)
745 goto fail;
746
747 close_session = true;
748
5b6319dc
LP		 749 if ((!(e = pam_getenvlist(handle)))) {
750 pam_code = PAM_BUF_ERR;
751 goto fail;
752 }
753
754 /* Block SIGTERM, so that we know that it won't get lost in
755 * the child */
756 if (sigemptyset(&ss) < 0 ||
757 sigaddset(&ss, SIGTERM) < 0 ||
758 sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0)
759 goto fail;
760
761 parent_pid = getpid();
762
763 if ((pam_pid = fork()) < 0)
764 goto fail;
765
766 if (pam_pid == 0) {
767 int sig;
768 int r = EXIT_PAM;
769
770 /* The child's job is to reset the PAM session on
771 * termination */
772
773 /* This string must fit in 10 chars (i.e. the length
5d6b1584
LP		 774 * of "/sbin/init"), to look pretty in /bin/ps */
775 rename_process("(sd-pam)");
5b6319dc
LP		 776
777 /* Make sure we don't keep open the passed fds in this
778 child. We assume that otherwise only those fds are
779 open here that have been opened by PAM. */
780 close_many(fds, n_fds);
781
782 /* Wait until our parent died. This will most likely
783 * not work since the kernel does not allow
35b8ca3a 784 * unprivileged parents kill their privileged children
5b6319dc
LP		 785 * this way. We rely on the control groups kill logic
786 * to do the rest for us. */
787 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
788 goto child_finish;
789
790 /* Check if our parent process might already have
791 * died? */
792 if (getppid() == parent_pid) {
3dead8d9
LP		 793 for (;;) {
794 if (sigwait(&ss, &sig) < 0) {
795 if (errno == EINTR)
796 continue;
797
798 goto child_finish;
799 }
5b6319dc 800
3dead8d9
LP		 801 assert(sig == SIGTERM);
802 break;
803 }
5b6319dc
LP		 804 }
805
3dead8d9 806 /* If our parent died we'll end the session */
5b6319dc
LP		 807 if (getppid() != parent_pid)
808 if ((pam_code = pam_close_session(handle, PAM_DATA_SILENT)) != PAM_SUCCESS)
809 goto child_finish;
810
811 r = 0;
812
813 child_finish:
814 pam_end(handle, pam_code | PAM_DATA_SILENT);
815 _exit(r);
816 }
817
818 /* If the child was forked off successfully it will do all the
819 * cleanups, so forget about the handle here. */
820 handle = NULL;
821
3b8bddde 822 /* Unblock SIGTERM again in the parent */
5b6319dc
LP		 823 if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0)
824 goto fail;
825
826 /* We close the log explicitly here, since the PAM modules
827 * might have opened it, but we don't want this fd around. */
828 closelog();
829
aa87e624
LP		 830 *pam_env = e;
831 e = NULL;
832
5b6319dc
LP		 833 return 0;
834
835fail:
9ba35398
MS		 836 if (pam_code != PAM_SUCCESS)
837 err = -EPERM; /* PAM errors do not map to errno */
838 else
839 err = -errno;
840
5b6319dc
LP		 841 if (handle) {
842 if (close_session)
843 pam_code = pam_close_session(handle, PAM_DATA_SILENT);
844
845 pam_end(handle, pam_code | PAM_DATA_SILENT);
846 }
847
848 strv_free(e);
849
850 closelog();
851
430c18ed 852 if (pam_pid > 1) {
5b6319dc 853 kill(pam_pid, SIGTERM);
430c18ed
LP		 854 kill(pam_pid, SIGCONT);
855 }
5b6319dc 856
9ba35398 857 return err;
5b6319dc
LP		 858}
859#endif
860
73090dc8
LP		 861static int do_capability_bounding_set_drop(uint64_t drop) {
862 unsigned long i;
863 cap_t old_cap = NULL, new_cap = NULL;
864 cap_flag_value_t fv;
865 int r;
866
867 /* If we are run as PID 1 we will lack CAP_SETPCAP by default
868 * in the effective set (yes, the kernel drops that when
869 * executing init!), so get it back temporarily so that we can
870 * call PR_CAPBSET_DROP. */
871
872 old_cap = cap_get_proc();
873 if (!old_cap)
874 return -errno;
875
876 if (cap_get_flag(old_cap, CAP_SETPCAP, CAP_EFFECTIVE, &fv) < 0) {
877 r = -errno;
878 goto finish;
879 }
880
881 if (fv != CAP_SET) {
882 static const cap_value_t v = CAP_SETPCAP;
883
884 new_cap = cap_dup(old_cap);
885 if (!new_cap) {
886 r = -errno;
887 goto finish;
888 }
889
890 if (cap_set_flag(new_cap, CAP_EFFECTIVE, 1, &v, CAP_SET) < 0) {
891 r = -errno;
892 goto finish;
893 }
894
895 if (cap_set_proc(new_cap) < 0) {
896 r = -errno;
897 goto finish;
898 }
899 }
900
64685e0c 901 for (i = 0; i <= cap_last_cap(); i++)
73090dc8
LP		 902 if (drop & ((uint64_t) 1ULL << (uint64_t) i)) {
903 if (prctl(PR_CAPBSET_DROP, i) < 0) {
904 r = -errno;
905 goto finish;
906 }
907 }
908
909 r = 0;
910
911finish:
912 if (new_cap)
913 cap_free(new_cap);
914
915 if (old_cap) {
916 cap_set_proc(old_cap);
917 cap_free(old_cap);
918 }
919
920 return r;
921}
922
5d6b1584
LP		 923static void rename_process_from_path(const char *path) {
924 char process_name[11];
925 const char *p;
926 size_t l;
927
928 /* This resulting string must fit in 10 chars (i.e. the length
929 * of "/sbin/init") to look pretty in /bin/ps */
930
931 p = file_name_from_path(path);
932 if (isempty(p)) {
933 rename_process("(...)");
934 return;
935 }
936
937 l = strlen(p);
938 if (l > 8) {
939 /* The end of the process name is usually more
940 * interesting, since the first bit might just be
941 * "systemd-" */
942 p = p + l - 8;
943 l = 8;
944 }
945
946 process_name[0] = '(';
947 memcpy(process_name+1, p, l);
948 process_name[1+l] = ')';
949 process_name[1+l+1] = 0;
950
951 rename_process(process_name);
952}
953
9fb86720 954int exec_spawn(ExecCommand *command,
9e2f7c11 955 char **argv,
81a2b7ce 956 const ExecContext *context,
c2748801 957 int fds[], unsigned n_fds,
1137a57c 958 char **environment,
81a2b7ce
LP		 959 bool apply_permissions,
960 bool apply_chroot,
1e3ad081 961 bool apply_tty_stdin,
80876c20 962 bool confirm_spawn,
8e274523 963 CGroupBonding *cgroup_bondings,
ab1f0633 964 CGroupAttribute *cgroup_attributes,
81a2b7ce
LP		 965 pid_t *ret) {
966
034c6ed7 967 pid_t pid;
8e274523 968 int r;
1a63a750 969 char *line;
4f2d528d 970 int socket_fd;
8c7be95e 971 char **files_env = NULL;
034c6ed7 972
5cb5a6ff
LP		 973 assert(command);
974 assert(context);
975 assert(ret);
034c6ed7
LP		 976 assert(fds || n_fds <= 0);
977
4f2d528d
LP		 978 if (context->std_input == EXEC_INPUT_SOCKET ||
979 context->std_output == EXEC_OUTPUT_SOCKET ||
980 context->std_error == EXEC_OUTPUT_SOCKET) {
981
982 if (n_fds != 1)
983 return -EINVAL;
984
985 socket_fd = fds[0];
986
987 fds = NULL;
988 n_fds = 0;
989 } else
990 socket_fd = -1;
991
8c7be95e
LP		 992 if ((r = exec_context_load_environment(context, &files_env)) < 0) {
993 log_error("Failed to load environment files: %s", strerror(-r));
994 return r;
995 }
996
9e2f7c11
LP		 997 if (!argv)
998 argv = command->argv;
999
8c7be95e
LP		 1000 if (!(line = exec_command_line(argv))) {
1001 r = -ENOMEM;
1002 goto fail_parent;
1003 }
1a63a750
LP		 1004
1005 log_debug("About to execute: %s", line);
1006 free(line);
acbb0225 1007
ab1f0633
LP		 1008 r = cgroup_bonding_realize_list(cgroup_bondings);
1009 if (r < 0)
1010 goto fail_parent;
1011
1012 cgroup_attribute_apply_list(cgroup_attributes, cgroup_bondings);
8e274523 1013
8c7be95e
LP		 1014 if ((pid = fork()) < 0) {
1015 r = -errno;
1016 goto fail_parent;
1017 }
034c6ed7
LP		 1018
1019 if (pid == 0) {
4c2630eb 1020 int i, err;
309bff19 1021 sigset_t ss;
81a2b7ce
LP		 1022 const char *username = NULL, *home = NULL;
1023 uid_t uid = (uid_t) -1;
1024 gid_t gid = (gid_t) -1;
fab56fc5 1025 char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
81a2b7ce 1026 unsigned n_env = 0;
80876c20 1027 int saved_stdout = -1, saved_stdin = -1;
8d53b453 1028 bool keep_stdout = false, keep_stdin = false, set_access = false;
309bff19 1029
034c6ed7 1030 /* child */
5cb5a6ff 1031
5d6b1584 1032 rename_process_from_path(command->path);
5b6319dc 1033
1b91d3e8
LP		 1034 /* We reset exactly these signals, since they are the
1035 * only ones we set to SIG_IGN in the main daemon. All
1036 * others we leave untouched because we set them to
1037 * SIG_DFL or a valid handler initially, both of which
1038 * will be demoted to SIG_DFL. */
1039 default_signals(SIGNALS_CRASH_HANDLER,
9a34ec5f 1040 SIGNALS_IGNORE, -1);
7b683879 1041
353e12c2
LP		 1042 if (context->ignore_sigpipe)
1043 ignore_signals(SIGPIPE, -1);
1044
1045 assert_se(sigemptyset(&ss) == 0);
1046 if (sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
4c2630eb 1047 err = -errno;
309bff19 1048 r = EXIT_SIGNAL_MASK;
8c7be95e 1049 goto fail_child;
309bff19
LP		 1050 }
1051
85d73053
LP		 1052 /* Close sockets very early to make sure we don't
1053 * block init reexecution because it cannot bind its
1054 * sockets */
4d8a7798 1055 log_forget_fds();
4c2630eb
MS		 1056 err = close_all_fds(socket_fd >= 0 ? &socket_fd : fds,
1057 socket_fd >= 0 ? 1 : n_fds);
1058 if (err < 0) {
fc9b2a84 1059 r = EXIT_FDS;
8c7be95e 1060 goto fail_child;
fc9b2a84
LP		 1061 }
1062
74922904 1063 if (!context->same_pgrp)
8d567588 1064 if (setsid() < 0) {
4c2630eb 1065 err = -errno;
8d567588 1066 r = EXIT_SETSID;
8c7be95e 1067 goto fail_child;
8d567588 1068 }
80876c20 1069
c5da34ef
LP		 1070 if (context->tcpwrap_name) {
1071 if (socket_fd >= 0)
1072 if (!socket_tcpwrap(socket_fd, context->tcpwrap_name)) {
4c2630eb 1073 err = -EACCES;
c5da34ef 1074 r = EXIT_TCPWRAP;
8c7be95e 1075 goto fail_child;
c5da34ef
LP		 1076 }
1077
1078 for (i = 0; i < (int) n_fds; i++) {
1079 if (!socket_tcpwrap(fds[i], context->tcpwrap_name)) {
4c2630eb 1080 err = -EACCES;
c5da34ef 1081 r = EXIT_TCPWRAP;
8c7be95e 1082 goto fail_child;
c5da34ef 1083 }
df1f0afe 1084 }
c5da34ef 1085 }
df1f0afe 1086
6ea832a2
LP		 1087 exec_context_tty_reset(context);
1088
1e3ad081
LP		 1089 /* We skip the confirmation step if we shall not apply the TTY */
1090 if (confirm_spawn &&
1091 (!is_terminal_input(context->std_input) || apply_tty_stdin)) {
80876c20
LP		 1092 char response;
1093
1094 /* Set up terminal for the question */
1095 if ((r = setup_confirm_stdio(context,
4c2630eb
MS		 1096 &saved_stdin, &saved_stdout))) {
1097 err = -errno;
8c7be95e 1098 goto fail_child;
4c2630eb 1099 }
80876c20
LP		 1100
1101 /* Now ask the question. */
9e2f7c11 1102 if (!(line = exec_command_line(argv))) {
4c2630eb 1103 err = -ENOMEM;
80876c20 1104 r = EXIT_MEMORY;
8c7be95e 1105 goto fail_child;
ee2b4894 1106 }
80876c20
LP		 1107
1108 r = ask(&response, "yns", "Execute %s? [Yes, No, Skip] ", line);
1109 free(line);
1110
1111 if (r < 0 || response == 'n') {
4c2630eb 1112 err = -ECANCELED;
80876c20 1113 r = EXIT_CONFIRM;
8c7be95e 1114 goto fail_child;
80876c20 1115 } else if (response == 's') {
4c2630eb 1116 err = r = 0;
8c7be95e 1117 goto fail_child;
ee2b4894 1118 }
80876c20
LP		 1119
1120 /* Release terminal for the question */
2608882f 1121 if ((r = restore_confirm_stdio(context,
80876c20 1122 &saved_stdin, &saved_stdout,
4c2630eb
MS		 1123 &keep_stdin, &keep_stdout))) {
1124 err = -errno;
8c7be95e 1125 goto fail_child;
4c2630eb 1126 }
034c6ed7
LP		 1127 }
1128
da726a4d
LP		 1129 /* If a socket is connected to STDIN/STDOUT/STDERR, we
1130 * must sure to drop O_NONBLOCK */
1131 if (socket_fd >= 0)
1132 fd_nonblock(socket_fd, false);
1133
4c2630eb
MS		 1134 if (!keep_stdin) {
1135 err = setup_input(context, socket_fd, apply_tty_stdin);
1136 if (err < 0) {
80876c20 1137 r = EXIT_STDIN;
8c7be95e 1138 goto fail_child;
80876c20 1139 }
4c2630eb 1140 }
9eba9da4 1141
4c2630eb
MS		 1142 if (!keep_stdout) {
1143 err = setup_output(context, socket_fd, file_name_from_path(command->path), apply_tty_stdin);
1144 if (err < 0) {
80876c20 1145 r = EXIT_STDOUT;
8c7be95e 1146 goto fail_child;
80876c20 1147 }
4c2630eb 1148 }
94f04347 1149
4c2630eb
MS		 1150 err = setup_error(context, socket_fd, file_name_from_path(command->path), apply_tty_stdin);
1151 if (err < 0) {
80876c20 1152 r = EXIT_STDERR;
8c7be95e 1153 goto fail_child;
071830ff
LP		 1154 }
1155
4c2630eb
MS		 1156 if (cgroup_bondings) {
1157 err = cgroup_bonding_install_list(cgroup_bondings, 0);
1158 if (err < 0) {
8e274523 1159 r = EXIT_CGROUP;
8c7be95e 1160 goto fail_child;
8e274523 1161 }
4c2630eb 1162 }
8e274523 1163
dd6c17b1 1164 if (context->oom_score_adjust_set) {
fb33a393 1165 char t[16];
034c6ed7 1166
dd6c17b1 1167 snprintf(t, sizeof(t), "%i", context->oom_score_adjust);
fb33a393 1168 char_array_0(t);
034c6ed7 1169
dd6c17b1
LP		 1170 if (write_one_line_file("/proc/self/oom_score_adj", t) < 0) {
1171 /* Compatibility with Linux <= 2.6.35 */
1172
1173 int adj;
1174
1175 adj = (context->oom_score_adjust * -OOM_DISABLE) / OOM_SCORE_ADJ_MAX;
1176 adj = CLAMP(adj, OOM_DISABLE, OOM_ADJUST_MAX);
1177
1178 snprintf(t, sizeof(t), "%i", adj);
1179 char_array_0(t);
1180
90a5f6e4
LP		 1181 if (write_one_line_file("/proc/self/oom_adj", t) < 0
1182 && errno != EACCES) {
4c2630eb 1183 err = -errno;
dd6c17b1 1184 r = EXIT_OOM_ADJUST;
8c7be95e 1185 goto fail_child;
dd6c17b1 1186 }
fb33a393 1187 }
034c6ed7
LP		 1188 }
1189
fb33a393
LP		 1190 if (context->nice_set)
1191 if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
4c2630eb 1192 err = -errno;
fb33a393 1193 r = EXIT_NICE;
8c7be95e 1194 goto fail_child;
fb33a393
LP		 1195 }
1196
94f04347
LP		 1197 if (context->cpu_sched_set) {
1198 struct sched_param param;
1199
1200 zero(param);
1201 param.sched_priority = context->cpu_sched_priority;
1202
38b48754
LP		 1203 if (sched_setscheduler(0, context->cpu_sched_policy |
1204 (context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), &param) < 0) {
4c2630eb 1205 err = -errno;
94f04347 1206 r = EXIT_SETSCHEDULER;
8c7be95e 1207 goto fail_child;
94f04347
LP		 1208 }
1209 }
1210
82c121a4
LP		 1211 if (context->cpuset)
1212 if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
4c2630eb 1213 err = -errno;
94f04347 1214 r = EXIT_CPUAFFINITY;
8c7be95e 1215 goto fail_child;
94f04347
LP		 1216 }
1217
9eba9da4
LP		 1218 if (context->ioprio_set)
1219 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
4c2630eb 1220 err = -errno;
9eba9da4 1221 r = EXIT_IOPRIO;
8c7be95e 1222 goto fail_child;
9eba9da4
LP		 1223 }
1224
03fae018
LP		 1225 if (context->timer_slack_nsec_set)
1226 if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
4c2630eb 1227 err = -errno;
94f04347 1228 r = EXIT_TIMERSLACK;
8c7be95e 1229 goto fail_child;
94f04347
LP		 1230 }
1231
169c1bda 1232 if (context->utmp_id)
0ad26e09 1233 utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path);
169c1bda 1234
81a2b7ce
LP		 1235 if (context->user) {
1236 username = context->user;
4c2630eb
MS		 1237 err = get_user_creds(&username, &uid, &gid, &home);
1238 if (err < 0) {
81a2b7ce 1239 r = EXIT_USER;
8c7be95e 1240 goto fail_child;
81a2b7ce 1241 }
d8b4e2e9 1242
4c2630eb
MS		 1243 if (is_terminal_input(context->std_input)) {
1244 err = chown_terminal(STDIN_FILENO, uid);
1245 if (err < 0) {
d8b4e2e9 1246 r = EXIT_STDIN;
8c7be95e 1247 goto fail_child;
d8b4e2e9 1248 }
4c2630eb 1249 }
64747e2d 1250
4c2630eb
MS		 1251 if (cgroup_bondings && context->control_group_modify) {
1252 err = cgroup_bonding_set_group_access_list(cgroup_bondings, 0755, uid, gid);
1253 if (err >= 0)
891703e1 1254 err = cgroup_bonding_set_task_access_list(cgroup_bondings, 0644, uid, gid, context->control_group_persistent);
4c2630eb 1255 if (err < 0) {
64747e2d
LP		 1256 r = EXIT_CGROUP;
1257 goto fail_child;
1258 }
8d53b453
LP		 1259
1260 set_access = true;
1261 }
1262 }
1263
891703e1
KS		 1264 if (cgroup_bondings && !set_access && context->control_group_persistent >= 0) {
1265 err = cgroup_bonding_set_task_access_list(cgroup_bondings, (mode_t) -1, (uid_t) -1, (uid_t) -1, context->control_group_persistent);
8d53b453
LP		 1266 if (err < 0) {
1267 r = EXIT_CGROUP;
1268 goto fail_child;
4c2630eb 1269 }
81a2b7ce
LP		 1270 }
1271
4c2630eb
MS		 1272 if (apply_permissions) {
1273 err = enforce_groups(context, username, gid);
1274 if (err < 0) {
3b8bddde
LP		 1275 r = EXIT_GROUP;
1276 goto fail_child;
1277 }
4c2630eb 1278 }
3b8bddde
LP		 1279
1280 umask(context->umask);
1281
5b6319dc
LP		 1282#ifdef HAVE_PAM
1283 if (context->pam_name && username) {
4c2630eb
MS		 1284 err = setup_pam(context->pam_name, username, context->tty_path, &pam_env, fds, n_fds);
1285 if (err < 0) {
5b6319dc 1286 r = EXIT_PAM;
8c7be95e 1287 goto fail_child;
5b6319dc
LP		 1288 }
1289 }
1290#endif
ff01d048
LP		 1291 if (context->private_network) {
1292 if (unshare(CLONE_NEWNET) < 0) {
4c2630eb 1293 err = -errno;
ff01d048
LP		 1294 r = EXIT_NETWORK;
1295 goto fail_child;
1296 }
1297
1298 loopback_setup();
1299 }
5b6319dc 1300
04aa0cb9
LP		 1301 if (strv_length(context->read_write_dirs) > 0 ||
1302 strv_length(context->read_only_dirs) > 0 ||
1303 strv_length(context->inaccessible_dirs) > 0 ||
1304 context->mount_flags != MS_SHARED ||
4c2630eb
MS		 1305 context->private_tmp) {
1306 err = setup_namespace(context->read_write_dirs,
1307 context->read_only_dirs,
1308 context->inaccessible_dirs,
1309 context->private_tmp,
1310 context->mount_flags);
1311 if (err < 0) {
1312 r = EXIT_NAMESPACE;
8c7be95e 1313 goto fail_child;
4c2630eb
MS		 1314 }
1315 }
04aa0cb9 1316
81a2b7ce
LP		 1317 if (apply_chroot) {
1318 if (context->root_directory)
1319 if (chroot(context->root_directory) < 0) {
4c2630eb 1320 err = -errno;
81a2b7ce 1321 r = EXIT_CHROOT;
8c7be95e 1322 goto fail_child;
81a2b7ce
LP		 1323 }
1324
1325 if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
4c2630eb 1326 err = -errno;
81a2b7ce 1327 r = EXIT_CHDIR;
8c7be95e 1328 goto fail_child;
81a2b7ce
LP		 1329 }
1330 } else {
1331
1332 char *d;
1333
1334 if (asprintf(&d, "%s/%s",
1335 context->root_directory ? context->root_directory : "",
1336 context->working_directory ? context->working_directory : "") < 0) {
4c2630eb 1337 err = -ENOMEM;
81a2b7ce 1338 r = EXIT_MEMORY;
8c7be95e 1339 goto fail_child;
81a2b7ce
LP		 1340 }
1341
1342 if (chdir(d) < 0) {
4c2630eb 1343 err = -errno;
81a2b7ce
LP		 1344 free(d);
1345 r = EXIT_CHDIR;
8c7be95e 1346 goto fail_child;
81a2b7ce
LP		 1347 }
1348
1349 free(d);
1350 }
1351
fc9b2a84
LP		 1352 /* We repeat the fd closing here, to make sure that
1353 * nothing is leaked from the PAM modules */
4c2630eb
MS		 1354 err = close_all_fds(fds, n_fds);
1355 if (err >= 0)
1356 err = shift_fds(fds, n_fds);
1357 if (err >= 0)
1358 err = flags_fds(fds, n_fds, context->non_blocking);
1359 if (err < 0) {
034c6ed7 1360 r = EXIT_FDS;
8c7be95e 1361 goto fail_child;
034c6ed7
LP		 1362 }
1363
81a2b7ce 1364 if (apply_permissions) {
034c6ed7 1365
81a2b7ce
LP		 1366 for (i = 0; i < RLIMIT_NLIMITS; i++) {
1367 if (!context->rlimit[i])
1368 continue;
1369
1370 if (setrlimit(i, context->rlimit[i]) < 0) {
4c2630eb 1371 err = -errno;
81a2b7ce 1372 r = EXIT_LIMITS;
8c7be95e 1373 goto fail_child;
81a2b7ce 1374 }
034c6ed7 1375 }
034c6ed7 1376
4c2630eb
MS		 1377 if (context->capability_bounding_set_drop) {
1378 err = do_capability_bounding_set_drop(context->capability_bounding_set_drop);
1379 if (err < 0) {
73090dc8
LP		 1380 r = EXIT_CAPABILITIES;
1381 goto fail_child;
1382 }
4c2630eb 1383 }
260abb78 1384
4c2630eb
MS		 1385 if (context->user) {
1386 err = enforce_user(context, uid);
1387 if (err < 0) {
81a2b7ce 1388 r = EXIT_USER;
8c7be95e 1389 goto fail_child;
81a2b7ce 1390 }
4c2630eb 1391 }
81a2b7ce 1392
35b8ca3a 1393 /* PR_GET_SECUREBITS is not privileged, while
693ced48
LP		 1394 * PR_SET_SECUREBITS is. So to suppress
1395 * potential EPERMs we'll try not to call
1396 * PR_SET_SECUREBITS unless necessary. */
1397 if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
1398 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
4c2630eb 1399 err = -errno;
693ced48 1400 r = EXIT_SECUREBITS;
8c7be95e 1401 goto fail_child;
693ced48 1402 }
81a2b7ce
LP		 1403
1404 if (context->capabilities)
1405 if (cap_set_proc(context->capabilities) < 0) {
4c2630eb 1406 err = -errno;
81a2b7ce 1407 r = EXIT_CAPABILITIES;
8c7be95e 1408 goto fail_child;
81a2b7ce 1409 }
94f04347
LP		 1410 }
1411
e3aa71c3 1412 if (!(our_env = new0(char*, 7))) {
4c2630eb 1413 err = -ENOMEM;
81a2b7ce 1414 r = EXIT_MEMORY;
8c7be95e 1415 goto fail_child;
81a2b7ce 1416 }
034c6ed7 1417
81a2b7ce 1418 if (n_fds > 0)
bb00e604 1419 if (asprintf(our_env + n_env++, "LISTEN_PID=%lu", (unsigned long) getpid()) < 0 ||
81a2b7ce 1420 asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0) {
4c2630eb 1421 err = -ENOMEM;
81a2b7ce 1422 r = EXIT_MEMORY;
8c7be95e 1423 goto fail_child;
81a2b7ce 1424 }
034c6ed7 1425
81a2b7ce
LP		 1426 if (home)
1427 if (asprintf(our_env + n_env++, "HOME=%s", home) < 0) {
4c2630eb 1428 err = -ENOMEM;
81a2b7ce 1429 r = EXIT_MEMORY;
8c7be95e 1430 goto fail_child;
81a2b7ce 1431 }
034c6ed7 1432
81a2b7ce
LP		 1433 if (username)
1434 if (asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 ||
1435 asprintf(our_env + n_env++, "USER=%s", username) < 0) {
4c2630eb 1436 err = -ENOMEM;
81a2b7ce 1437 r = EXIT_MEMORY;
8c7be95e 1438 goto fail_child;
81a2b7ce 1439 }
034c6ed7 1440
e3aa71c3
LP		 1441 if (is_terminal_input(context->std_input) ||
1442 context->std_output == EXEC_OUTPUT_TTY ||
1443 context->std_error == EXEC_OUTPUT_TTY)
1444 if (!(our_env[n_env++] = strdup(default_term_for_tty(tty_path(context))))) {
4c2630eb 1445 err = -ENOMEM;
e3aa71c3 1446 r = EXIT_MEMORY;
8c7be95e 1447 goto fail_child;
e3aa71c3
LP		 1448 }
1449
1450 assert(n_env <= 7);
4e85aff4 1451
5b6319dc 1452 if (!(final_env = strv_env_merge(
8c7be95e 1453 5,
5b6319dc
LP		 1454 environment,
1455 our_env,
1456 context->environment,
8c7be95e 1457 files_env,
5b6319dc
LP		 1458 pam_env,
1459 NULL))) {
4c2630eb 1460 err = -ENOMEM;
81a2b7ce 1461 r = EXIT_MEMORY;
8c7be95e 1462 goto fail_child;
81a2b7ce 1463 }
034c6ed7 1464
fab56fc5 1465 if (!(final_argv = replace_env_argv(argv, final_env))) {
4c2630eb 1466 err = -ENOMEM;
fab56fc5 1467 r = EXIT_MEMORY;
8c7be95e 1468 goto fail_child;
fab56fc5
LP		 1469 }
1470
a6ff950e
LP		 1471 final_env = strv_env_clean(final_env);
1472
fab56fc5 1473 execve(command->path, final_argv, final_env);
4c2630eb 1474 err = -errno;
034c6ed7
LP		 1475 r = EXIT_EXEC;
1476
8c7be95e 1477 fail_child:
4c2630eb
MS		 1478 if (r != 0) {
1479 log_open();
1480 log_warning("Failed at step %s spawning %s: %s",
1481 exit_status_to_string(r, EXIT_STATUS_SYSTEMD),
1482 command->path, strerror(-err));
1483 }
1484
81a2b7ce
LP		 1485 strv_free(our_env);
1486 strv_free(final_env);
5b6319dc 1487 strv_free(pam_env);
8c7be95e 1488 strv_free(files_env);
fab56fc5 1489 strv_free(final_argv);
81a2b7ce 1490
80876c20
LP		 1491 if (saved_stdin >= 0)
1492 close_nointr_nofail(saved_stdin);
1493
1494 if (saved_stdout >= 0)
1495 close_nointr_nofail(saved_stdout);
1496
034c6ed7
LP		 1497 _exit(r);
1498 }
1499
8c7be95e
LP		 1500 strv_free(files_env);
1501
80876c20
LP		 1502 /* We add the new process to the cgroup both in the child (so
1503 * that we can be sure that no user code is ever executed
1504 * outside of the cgroup) and in the parent (so that we can be
1505 * sure that when we kill the cgroup the process will be
1506 * killed too). */
1507 if (cgroup_bondings)
4e85aff4 1508 cgroup_bonding_install_list(cgroup_bondings, pid);
2da3263a 1509
bb00e604 1510 log_debug("Forked %s as %lu", command->path, (unsigned long) pid);
2da3263a 1511
b58b4116 1512 exec_status_start(&command->exec_status, pid);
9fb86720 1513
034c6ed7 1514 *ret = pid;
5cb5a6ff 1515 return 0;
8c7be95e
LP		 1516
1517fail_parent:
1518 strv_free(files_env);
1519
1520 return r;
5cb5a6ff
LP		 1521}
1522
034c6ed7
LP		 1523void exec_context_init(ExecContext *c) {
1524 assert(c);
1525
4c12626c 1526 c->umask = 0022;
9eba9da4 1527 c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
94f04347 1528 c->cpu_sched_policy = SCHED_OTHER;
071830ff 1529 c->syslog_priority = LOG_DAEMON|LOG_INFO;
74922904 1530 c->syslog_level_prefix = true;
15ae422b 1531 c->mount_flags = MS_SHARED;
2e22afe9 1532 c->kill_signal = SIGTERM;
ba035df2 1533 c->send_sigkill = true;
891703e1 1534 c->control_group_persistent = -1;
353e12c2 1535 c->ignore_sigpipe = true;
034c6ed7
LP		 1536}
1537
1538void exec_context_done(ExecContext *c) {
5cb5a6ff
LP		 1539 unsigned l;
1540
1541 assert(c);
1542
1543 strv_free(c->environment);
034c6ed7 1544 c->environment = NULL;
5cb5a6ff 1545
8c7be95e
LP		 1546 strv_free(c->environment_files);
1547 c->environment_files = NULL;
1548
034c6ed7 1549 for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
5cb5a6ff 1550 free(c->rlimit[l]);
034c6ed7
LP		 1551 c->rlimit[l] = NULL;
1552 }
1553
9eba9da4
LP		 1554 free(c->working_directory);
1555 c->working_directory = NULL;
1556 free(c->root_directory);
1557 c->root_directory = NULL;
5cb5a6ff 1558
80876c20
LP		 1559 free(c->tty_path);
1560 c->tty_path = NULL;
1561
df1f0afe
LP		 1562 free(c->tcpwrap_name);
1563 c->tcpwrap_name = NULL;
1564
071830ff
LP		 1565 free(c->syslog_identifier);
1566 c->syslog_identifier = NULL;
1567
5cb5a6ff 1568 free(c->user);
034c6ed7
LP		 1569 c->user = NULL;
1570
5cb5a6ff 1571 free(c->group);
034c6ed7
LP		 1572 c->group = NULL;
1573
1574 strv_free(c->supplementary_groups);
1575 c->supplementary_groups = NULL;
94f04347 1576
5b6319dc
LP		 1577 free(c->pam_name);
1578 c->pam_name = NULL;
1579
94f04347
LP		 1580 if (c->capabilities) {
1581 cap_free(c->capabilities);
1582 c->capabilities = NULL;
1583 }
15ae422b
LP		 1584
1585 strv_free(c->read_only_dirs);
1586 c->read_only_dirs = NULL;
1587
1588 strv_free(c->read_write_dirs);
1589 c->read_write_dirs = NULL;
1590
1591 strv_free(c->inaccessible_dirs);
1592 c->inaccessible_dirs = NULL;
82c121a4
LP		 1593
1594 if (c->cpuset)
1595 CPU_FREE(c->cpuset);
86a3475b
LP		 1596
1597 free(c->utmp_id);
1598 c->utmp_id = NULL;
5cb5a6ff
LP		 1599}
1600
43d0fcbd
LP		 1601void exec_command_done(ExecCommand *c) {
1602 assert(c);
1603
1604 free(c->path);
1605 c->path = NULL;
1606
1607 strv_free(c->argv);
1608 c->argv = NULL;
1609}
1610
1611void exec_command_done_array(ExecCommand *c, unsigned n) {
1612 unsigned i;
1613
1614 for (i = 0; i < n; i++)
1615 exec_command_done(c+i);
1616}
1617
5cb5a6ff
LP		 1618void exec_command_free_list(ExecCommand *c) {
1619 ExecCommand *i;
1620
1621 while ((i = c)) {
034c6ed7 1622 LIST_REMOVE(ExecCommand, command, c, i);
43d0fcbd 1623 exec_command_done(i);
5cb5a6ff
LP		 1624 free(i);
1625 }
1626}
1627
034c6ed7
LP		 1628void exec_command_free_array(ExecCommand **c, unsigned n) {
1629 unsigned i;
1630
1631 for (i = 0; i < n; i++) {
1632 exec_command_free_list(c[i]);
1633 c[i] = NULL;
1634 }
1635}
1636
8c7be95e
LP		 1637int exec_context_load_environment(const ExecContext *c, char ***l) {
1638 char **i, **r = NULL;
1639
1640 assert(c);
1641 assert(l);
1642
1643 STRV_FOREACH(i, c->environment_files) {
1644 char *fn;
1645 int k;
1646 bool ignore = false;
1647 char **p;
1648
1649 fn = *i;
1650
1651 if (fn[0] == '-') {
1652 ignore = true;
1653 fn ++;
1654 }
1655
1656 if (!path_is_absolute(fn)) {
1657
1658 if (ignore)
1659 continue;
1660
1661 strv_free(r);
1662 return -EINVAL;
1663 }
1664
1665 if ((k = load_env_file(fn, &p)) < 0) {
1666
1667 if (ignore)
1668 continue;
1669
1670 strv_free(r);
1671 return k;
1672 }
1673
1674 if (r == NULL)
1675 r = p;
1676 else {
1677 char **m;
1678
1679 m = strv_env_merge(2, r, p);
1680 strv_free(r);
1681 strv_free(p);
1682
1683 if (!m)
1684 return -ENOMEM;
1685
1686 r = m;
1687 }
1688 }
1689
1690 *l = r;
1691
1692 return 0;
1693}
1694
15ae422b
LP		 1695static void strv_fprintf(FILE *f, char **l) {
1696 char **g;
1697
1698 assert(f);
1699
1700 STRV_FOREACH(g, l)
1701 fprintf(f, " %s", *g);
1702}
1703
5cb5a6ff 1704void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
94f04347
LP		 1705 char ** e;
1706 unsigned i;
9eba9da4 1707
5cb5a6ff
LP		 1708 assert(c);
1709 assert(f);
1710
1711 if (!prefix)
1712 prefix = "";
1713
1714 fprintf(f,
94f04347
LP		 1715 "%sUMask: %04o\n"
1716 "%sWorkingDirectory: %s\n"
451a074f 1717 "%sRootDirectory: %s\n"
15ae422b 1718 "%sNonBlocking: %s\n"
64747e2d 1719 "%sPrivateTmp: %s\n"
ff01d048 1720 "%sControlGroupModify: %s\n"
891703e1 1721 "%sControlGroupPersistent: %s\n"
ff01d048 1722 "%sPrivateNetwork: %s\n",
5cb5a6ff 1723 prefix, c->umask,
9eba9da4 1724 prefix, c->working_directory ? c->working_directory : "/",
451a074f 1725 prefix, c->root_directory ? c->root_directory : "/",
15ae422b 1726 prefix, yes_no(c->non_blocking),
64747e2d 1727 prefix, yes_no(c->private_tmp),
ff01d048 1728 prefix, yes_no(c->control_group_modify),
891703e1 1729 prefix, yes_no(c->control_group_persistent),
ff01d048 1730 prefix, yes_no(c->private_network));
fb33a393 1731
8c7be95e
LP		 1732 STRV_FOREACH(e, c->environment)
1733 fprintf(f, "%sEnvironment: %s\n", prefix, *e);
1734
1735 STRV_FOREACH(e, c->environment_files)
1736 fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e);
94f04347 1737
df1f0afe
LP		 1738 if (c->tcpwrap_name)
1739 fprintf(f,
1740 "%sTCPWrapName: %s\n",
1741 prefix, c->tcpwrap_name);
1742
fb33a393
LP		 1743 if (c->nice_set)
1744 fprintf(f,
1745 "%sNice: %i\n",
1746 prefix, c->nice);
1747
dd6c17b1 1748 if (c->oom_score_adjust_set)
fb33a393 1749 fprintf(f,
dd6c17b1
LP		 1750 "%sOOMScoreAdjust: %i\n",
1751 prefix, c->oom_score_adjust);
9eba9da4 1752
94f04347
LP		 1753 for (i = 0; i < RLIM_NLIMITS; i++)
1754 if (c->rlimit[i])
ea430986 1755 fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
94f04347 1756
9eba9da4
LP		 1757 if (c->ioprio_set)
1758 fprintf(f,
1759 "%sIOSchedulingClass: %s\n"
1760 "%sIOPriority: %i\n",
94f04347 1761 prefix, ioprio_class_to_string(IOPRIO_PRIO_CLASS(c->ioprio)),
9eba9da4 1762 prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
94f04347
LP		 1763
1764 if (c->cpu_sched_set)
1765 fprintf(f,
1766 "%sCPUSchedulingPolicy: %s\n"
38b48754
LP		 1767 "%sCPUSchedulingPriority: %i\n"
1768 "%sCPUSchedulingResetOnFork: %s\n",
94f04347 1769 prefix, sched_policy_to_string(c->cpu_sched_policy),
38b48754
LP		 1770 prefix, c->cpu_sched_priority,
1771 prefix, yes_no(c->cpu_sched_reset_on_fork));
94f04347 1772
82c121a4 1773 if (c->cpuset) {
94f04347 1774 fprintf(f, "%sCPUAffinity:", prefix);
82c121a4
LP		 1775 for (i = 0; i < c->cpuset_ncpus; i++)
1776 if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset))
94f04347
LP		 1777 fprintf(f, " %i", i);
1778 fputs("\n", f);
1779 }
1780
03fae018
LP		 1781 if (c->timer_slack_nsec_set)
1782 fprintf(f, "%sTimerSlackNSec: %lu\n", prefix, c->timer_slack_nsec);
94f04347
LP		 1783
1784 fprintf(f,
80876c20
LP		 1785 "%sStandardInput: %s\n"
1786 "%sStandardOutput: %s\n"
1787 "%sStandardError: %s\n",
1788 prefix, exec_input_to_string(c->std_input),
1789 prefix, exec_output_to_string(c->std_output),
1790 prefix, exec_output_to_string(c->std_error));
1791
1792 if (c->tty_path)
1793 fprintf(f,
6ea832a2
LP		 1794 "%sTTYPath: %s\n"
1795 "%sTTYReset: %s\n"
1796 "%sTTYVHangup: %s\n"
1797 "%sTTYVTDisallocate: %s\n",
1798 prefix, c->tty_path,
1799 prefix, yes_no(c->tty_reset),
1800 prefix, yes_no(c->tty_vhangup),
1801 prefix, yes_no(c->tty_vt_disallocate));
94f04347 1802
706343f4
LP		 1803 if (c->std_output == EXEC_OUTPUT_SYSLOG || c->std_output == EXEC_OUTPUT_KMSG || c->std_output == EXEC_OUTPUT_JOURNAL ||
1804 c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE || c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE ||
1805 c->std_error == EXEC_OUTPUT_SYSLOG || c->std_error == EXEC_OUTPUT_KMSG || c->std_error == EXEC_OUTPUT_JOURNAL ||
1806 c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE || c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE)
94f04347
LP		 1807 fprintf(f,
1808 "%sSyslogFacility: %s\n"
1809 "%sSyslogLevel: %s\n",
7d76f312 1810 prefix, log_facility_unshifted_to_string(c->syslog_priority >> 3),
94f04347
LP		 1811 prefix, log_level_to_string(LOG_PRI(c->syslog_priority)));
1812
1813 if (c->capabilities) {
1814 char *t;
1815 if ((t = cap_to_text(c->capabilities, NULL))) {
1816 fprintf(f, "%sCapabilities: %s\n",
1817 prefix, t);
1818 cap_free(t);
1819 }
1820 }
1821
1822 if (c->secure_bits)
1823 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
1824 prefix,
1825 (c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "",
1826 (c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
1827 (c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
1828 (c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
1829 (c->secure_bits & SECURE_NOROOT) ? " noroot" : "",
1830 (c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
1831
1832 if (c->capability_bounding_set_drop) {
ae556c21 1833 unsigned long l;
260abb78 1834 fprintf(f, "%sCapabilityBoundingSet:", prefix);
94f04347 1835
64685e0c 1836 for (l = 0; l <= cap_last_cap(); l++)
ae556c21 1837 if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) {
94f04347
LP		 1838 char *t;
1839
ae556c21 1840 if ((t = cap_to_name(l))) {
94f04347 1841 fprintf(f, " %s", t);
260abb78 1842 cap_free(t);
94f04347
LP		 1843 }
1844 }
1845
1846 fputs("\n", f);
1847 }
1848
1849 if (c->user)
f2d3769a 1850 fprintf(f, "%sUser: %s\n", prefix, c->user);
94f04347 1851 if (c->group)
f2d3769a 1852 fprintf(f, "%sGroup: %s\n", prefix, c->group);
94f04347 1853
15ae422b 1854 if (strv_length(c->supplementary_groups) > 0) {
94f04347 1855 fprintf(f, "%sSupplementaryGroups:", prefix);
15ae422b
LP		 1856 strv_fprintf(f, c->supplementary_groups);
1857 fputs("\n", f);
1858 }
94f04347 1859
5b6319dc 1860 if (c->pam_name)
f2d3769a 1861 fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name);
5b6319dc 1862
15ae422b
LP		 1863 if (strv_length(c->read_write_dirs) > 0) {
1864 fprintf(f, "%sReadWriteDirs:", prefix);
1865 strv_fprintf(f, c->read_write_dirs);
1866 fputs("\n", f);
1867 }
1868
1869 if (strv_length(c->read_only_dirs) > 0) {
1870 fprintf(f, "%sReadOnlyDirs:", prefix);
1871 strv_fprintf(f, c->read_only_dirs);
1872 fputs("\n", f);
1873 }
94f04347 1874
15ae422b
LP		 1875 if (strv_length(c->inaccessible_dirs) > 0) {
1876 fprintf(f, "%sInaccessibleDirs:", prefix);
1877 strv_fprintf(f, c->inaccessible_dirs);
94f04347
LP		 1878 fputs("\n", f);
1879 }
2e22afe9
LP		 1880
1881 fprintf(f,
1882 "%sKillMode: %s\n"
ba035df2 1883 "%sKillSignal: SIG%s\n"
353e12c2
LP		 1884 "%sSendSIGKILL: %s\n"
1885 "%sIgnoreSIGPIPE: %s\n",
2e22afe9 1886 prefix, kill_mode_to_string(c->kill_mode),
ba035df2 1887 prefix, signal_to_string(c->kill_signal),
353e12c2
LP		 1888 prefix, yes_no(c->send_sigkill),
1889 prefix, yes_no(c->ignore_sigpipe));
169c1bda
LP		 1890
1891 if (c->utmp_id)
1892 fprintf(f,
1893 "%sUtmpIdentifier: %s\n",
1894 prefix, c->utmp_id);
5cb5a6ff
LP		 1895}
1896
b58b4116 1897void exec_status_start(ExecStatus *s, pid_t pid) {
034c6ed7 1898 assert(s);
5cb5a6ff 1899
b58b4116
LP		 1900 zero(*s);
1901 s->pid = pid;
1902 dual_timestamp_get(&s->start_timestamp);
1903}
1904
6ea832a2 1905void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) {
b58b4116
LP		 1906 assert(s);
1907
0b1f4ae6 1908 if (s->pid && s->pid != pid)
b58b4116
LP		 1909 zero(*s);
1910
034c6ed7 1911 s->pid = pid;
63983207 1912 dual_timestamp_get(&s->exit_timestamp);
9fb86720 1913
034c6ed7
LP		 1914 s->code = code;
1915 s->status = status;
169c1bda 1916
6ea832a2
LP		 1917 if (context) {
1918 if (context->utmp_id)
1919 utmp_put_dead_process(context->utmp_id, pid, code, status);
1920
1921 exec_context_tty_reset(context);
1922 }
9fb86720
LP		 1923}
1924
1925void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
1926 char buf[FORMAT_TIMESTAMP_MAX];
1927
1928 assert(s);
1929 assert(f);
1930
1931 if (!prefix)
1932 prefix = "";
1933
1934 if (s->pid <= 0)
1935 return;
1936
1937 fprintf(f,
bb00e604
LP		 1938 "%sPID: %lu\n",
1939 prefix, (unsigned long) s->pid);
9fb86720 1940
63983207 1941 if (s->start_timestamp.realtime > 0)
9fb86720
LP		 1942 fprintf(f,
1943 "%sStart Timestamp: %s\n",
63983207 1944 prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime));
9fb86720 1945
63983207 1946 if (s->exit_timestamp.realtime > 0)
9fb86720
LP		 1947 fprintf(f,
1948 "%sExit Timestamp: %s\n"
1949 "%sExit Code: %s\n"
1950 "%sExit Status: %i\n",
63983207 1951 prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime),
9fb86720
LP		 1952 prefix, sigchld_code_to_string(s->code),
1953 prefix, s->status);
5cb5a6ff 1954}
44d8db9e 1955
9e2f7c11 1956char *exec_command_line(char **argv) {
44d8db9e
LP		 1957 size_t k;
1958 char *n, *p, **a;
1959 bool first = true;
1960
9e2f7c11 1961 assert(argv);
44d8db9e 1962
9164977d 1963 k = 1;
9e2f7c11 1964 STRV_FOREACH(a, argv)
44d8db9e
LP		 1965 k += strlen(*a)+3;
1966
1967 if (!(n = new(char, k)))
1968 return NULL;
1969
1970 p = n;
9e2f7c11 1971 STRV_FOREACH(a, argv) {
44d8db9e
LP		 1972
1973 if (!first)
1974 *(p++) = ' ';
1975 else
1976 first = false;
1977
1978 if (strpbrk(*a, WHITESPACE)) {
1979 *(p++) = '\'';
1980 p = stpcpy(p, *a);
1981 *(p++) = '\'';
1982 } else
1983 p = stpcpy(p, *a);
1984
1985 }
1986
9164977d
LP		 1987 *p = 0;
1988
44d8db9e
LP		 1989 /* FIXME: this doesn't really handle arguments that have
1990 * spaces and ticks in them */
1991
1992 return n;
1993}
1994
1995void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
9fb86720
LP		 1996 char *p2;
1997 const char *prefix2;
1998
44d8db9e
LP		 1999 char *cmd;
2000
2001 assert(c);
2002 assert(f);
2003
2004 if (!prefix)
2005 prefix = "";
9fb86720
LP		 2006 p2 = strappend(prefix, "\t");
2007 prefix2 = p2 ? p2 : prefix;
44d8db9e 2008
9e2f7c11 2009 cmd = exec_command_line(c->argv);
44d8db9e
LP		 2010
2011 fprintf(f,
2012 "%sCommand Line: %s\n",
2013 prefix, cmd ? cmd : strerror(ENOMEM));
2014
2015 free(cmd);
9fb86720
LP		 2016
2017 exec_status_dump(&c->exec_status, f, prefix2);
2018
2019 free(p2);
44d8db9e
LP		 2020}
2021
2022void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
2023 assert(f);
2024
2025 if (!prefix)
2026 prefix = "";
2027
2028 LIST_FOREACH(command, c, c)
2029 exec_command_dump(c, f, prefix);
2030}
94f04347 2031
a6a80b4f
LP		 2032void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
2033 ExecCommand *end;
2034
2035 assert(l);
2036 assert(e);
2037
2038 if (*l) {
35b8ca3a 2039 /* It's kind of important, that we keep the order here */
a6a80b4f
LP		 2040 LIST_FIND_TAIL(ExecCommand, command, *l, end);
2041 LIST_INSERT_AFTER(ExecCommand, command, *l, end, e);
2042 } else
2043 *l = e;
2044}
2045
26fd040d
LP		 2046int exec_command_set(ExecCommand *c, const char *path, ...) {
2047 va_list ap;
2048 char **l, *p;
2049
2050 assert(c);
2051 assert(path);
2052
2053 va_start(ap, path);
2054 l = strv_new_ap(path, ap);
2055 va_end(ap);
2056
2057 if (!l)
2058 return -ENOMEM;
2059
2060 if (!(p = strdup(path))) {
2061 strv_free(l);
2062 return -ENOMEM;
2063 }
2064
2065 free(c->path);
2066 c->path = p;
2067
2068 strv_free(c->argv);
2069 c->argv = l;
2070
2071 return 0;
2072}
2073
80876c20
LP		 2074static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
2075 [EXEC_INPUT_NULL] = "null",
2076 [EXEC_INPUT_TTY] = "tty",
2077 [EXEC_INPUT_TTY_FORCE] = "tty-force",
4f2d528d
LP		 2078 [EXEC_INPUT_TTY_FAIL] = "tty-fail",
2079 [EXEC_INPUT_SOCKET] = "socket"
80876c20
LP		 2080};
2081
8a0867d6
LP		 2082DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
2083
94f04347 2084static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
80876c20 2085 [EXEC_OUTPUT_INHERIT] = "inherit",
94f04347 2086 [EXEC_OUTPUT_NULL] = "null",
80876c20 2087 [EXEC_OUTPUT_TTY] = "tty",
94f04347 2088 [EXEC_OUTPUT_SYSLOG] = "syslog",
28dbc1e8 2089 [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console",
9a6bca7a 2090 [EXEC_OUTPUT_KMSG] = "kmsg",
28dbc1e8 2091 [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console",
706343f4
LP		 2092 [EXEC_OUTPUT_JOURNAL] = "journal",
2093 [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console",
4f2d528d 2094 [EXEC_OUTPUT_SOCKET] = "socket"
94f04347
LP		 2095};
2096
2097DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
2098
8a0867d6
LP		 2099static const char* const kill_mode_table[_KILL_MODE_MAX] = {
2100 [KILL_CONTROL_GROUP] = "control-group",
8a0867d6
LP		 2101 [KILL_PROCESS] = "process",
2102 [KILL_NONE] = "none"
2103};
2104
2105DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);
2106
2107static const char* const kill_who_table[_KILL_WHO_MAX] = {
2108 [KILL_MAIN] = "main",
2109 [KILL_CONTROL] = "control",
2110 [KILL_ALL] = "all"
2111};
2112
2113DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);
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