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