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execute: unify setup_{output,error}
[thirdparty/systemd.git] / src / core / 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
5430f7f2
LP		 9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
a7334b09
LP		 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
5430f7f2 16 Lesser General Public License for more details.
a7334b09 17
5430f7f2 18 You should have received a copy of the GNU Lesser General Public License
a7334b09
LP		 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>
f2b68789 40#include <sys/poll.h>
8351ceae 41#include <linux/seccomp-bpf.h>
2bef10ab 42#include <glob.h>
5cb5a6ff 43
5b6319dc
LP		 44#ifdef HAVE_PAM
45#include <security/pam_appl.h>
46#endif
47
5cb5a6ff
LP		 48#include "execute.h"
49#include "strv.h"
50#include "macro.h"
d7832d2c 51#include "capability.h"
5cb5a6ff 52#include "util.h"
acbb0225 53#include "log.h"
20ad4cfd 54#include "sd-messages.h"
9eba9da4 55#include "ioprio.h"
94f04347 56#include "securebits.h"
8e274523 57#include "cgroup.h"
15ae422b 58#include "namespace.h"
df1f0afe 59#include "tcpwrap.h"
d06dacd0 60#include "exit-status.h"
dd6c17b1 61#include "missing.h"
169c1bda 62#include "utmp-wtmp.h"
f6a6225e 63#include "def.h"
ff01d048 64#include "loopback-setup.h"
9eb977db 65#include "path-util.h"
8351ceae 66#include "syscall-list.h"
4d1a6904 67#include "env-util.h"
a5c32cff 68#include "fileio.h"
5cb5a6ff 69
e056b01d 70#define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC)
e6a26745 71
02a51aba
LP		 72/* This assumes there is a 'tty' group */
73#define TTY_MODE 0620
74
034c6ed7
LP		 75static int shift_fds(int fds[], unsigned n_fds) {
76 int start, restart_from;
77
78 if (n_fds <= 0)
79 return 0;
80
a0d40ac5
LP		 81 /* Modifies the fds array! (sorts it) */
82
034c6ed7
LP		 83 assert(fds);
84
85 start = 0;
86 for (;;) {
87 int i;
88
89 restart_from = -1;
90
91 for (i = start; i < (int) n_fds; i++) {
92 int nfd;
93
94 /* Already at right index? */
95 if (fds[i] == i+3)
96 continue;
97
98 if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
99 return -errno;
100
e1f5e051 101 close_nointr_nofail(fds[i]);
034c6ed7
LP		 102 fds[i] = nfd;
103
104 /* Hmm, the fd we wanted isn't free? Then
105 * let's remember that and try again from here*/
106 if (nfd != i+3 && restart_from < 0)
107 restart_from = i;
108 }
109
110 if (restart_from < 0)
111 break;
112
113 start = restart_from;
114 }
115
116 return 0;
117}
118
c2748801 119static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) {
47a71eed 120 unsigned i;
e2c76839 121 int r;
47a71eed
LP		 122
123 if (n_fds <= 0)
124 return 0;
125
126 assert(fds);
127
451a074f 128 /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
47a71eed
LP		 129
130 for (i = 0; i < n_fds; i++) {
47a71eed 131
e2c76839
LP		 132 if ((r = fd_nonblock(fds[i], nonblock)) < 0)
133 return r;
47a71eed 134
451a074f
LP		 135 /* We unconditionally drop FD_CLOEXEC from the fds,
136 * since after all we want to pass these fds to our
137 * children */
47a71eed 138
e2c76839
LP		 139 if ((r = fd_cloexec(fds[i], false)) < 0)
140 return r;
47a71eed
LP		 141 }
142
143 return 0;
144}
145
80876c20
LP		 146static const char *tty_path(const ExecContext *context) {
147 assert(context);
148
149 if (context->tty_path)
150 return context->tty_path;
151
152 return "/dev/console";
153}
154
6ea832a2
LP		 155void exec_context_tty_reset(const ExecContext *context) {
156 assert(context);
157
158 if (context->tty_vhangup)
159 terminal_vhangup(tty_path(context));
160
161 if (context->tty_reset)
162 reset_terminal(tty_path(context));
163
164 if (context->tty_vt_disallocate && context->tty_path)
165 vt_disallocate(context->tty_path);
166}
167
80876c20
LP		 168static int open_null_as(int flags, int nfd) {
169 int fd, r;
071830ff 170
80876c20 171 assert(nfd >= 0);
071830ff 172
80876c20 173 if ((fd = open("/dev/null", flags|O_NOCTTY)) < 0)
071830ff
LP		 174 return -errno;
175
80876c20
LP		 176 if (fd != nfd) {
177 r = dup2(fd, nfd) < 0 ? -errno : nfd;
e1f5e051 178 close_nointr_nofail(fd);
80876c20
LP		 179 } else
180 r = nfd;
071830ff 181
80876c20 182 return r;
071830ff
LP		 183}
184
62bca2c6 185static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, const char *unit_id, int nfd) {
80876c20 186 int fd, r;
54fe0cdb 187 union sockaddr_union sa;
071830ff
LP		 188
189 assert(context);
80876c20
LP		 190 assert(output < _EXEC_OUTPUT_MAX);
191 assert(ident);
192 assert(nfd >= 0);
071830ff 193
54fe0cdb
LP		 194 fd = socket(AF_UNIX, SOCK_STREAM, 0);
195 if (fd < 0)
80876c20 196 return -errno;
071830ff 197
80876c20 198 zero(sa);
54fe0cdb
LP		 199 sa.un.sun_family = AF_UNIX;
200 strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path));
071830ff 201
54fe0cdb
LP		 202 r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
203 if (r < 0) {
80876c20
LP		 204 close_nointr_nofail(fd);
205 return -errno;
206 }
071830ff 207
80876c20
LP		 208 if (shutdown(fd, SHUT_RD) < 0) {
209 close_nointr_nofail(fd);
210 return -errno;
211 }
071830ff 212
80876c20 213 dprintf(fd,
62bca2c6 214 "%s\n"
80876c20
LP		 215 "%s\n"
216 "%i\n"
54fe0cdb
LP		 217 "%i\n"
218 "%i\n"
219 "%i\n"
4f4a1dbf 220 "%i\n",
4f4a1dbf 221 context->syslog_identifier ? context->syslog_identifier : ident,
62bca2c6 222 unit_id,
54fe0cdb
LP		 223 context->syslog_priority,
224 !!context->syslog_level_prefix,
225 output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE,
226 output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE,
706343f4 227 output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || output == EXEC_OUTPUT_KMSG_AND_CONSOLE || output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE);
80876c20
LP		 228
229 if (fd != nfd) {
230 r = dup2(fd, nfd) < 0 ? -errno : nfd;
e1f5e051 231 close_nointr_nofail(fd);
80876c20
LP		 232 } else
233 r = nfd;
071830ff 234
80876c20
LP		 235 return r;
236}
237static int open_terminal_as(const char *path, mode_t mode, int nfd) {
238 int fd, r;
071830ff 239
80876c20
LP		 240 assert(path);
241 assert(nfd >= 0);
071830ff 242
80876c20
LP		 243 if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
244 return fd;
071830ff 245
80876c20
LP		 246 if (fd != nfd) {
247 r = dup2(fd, nfd) < 0 ? -errno : nfd;
248 close_nointr_nofail(fd);
249 } else
250 r = nfd;
071830ff 251
80876c20
LP		 252 return r;
253}
071830ff 254
80876c20
LP		 255static bool is_terminal_input(ExecInput i) {
256 return
257 i == EXEC_INPUT_TTY ||
258 i == EXEC_INPUT_TTY_FORCE ||
259 i == EXEC_INPUT_TTY_FAIL;
260}
071830ff 261
1e3ad081
LP		 262static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) {
263
264 if (is_terminal_input(std_input) && !apply_tty_stdin)
265 return EXEC_INPUT_NULL;
071830ff 266
03fd9c49 267 if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 268 return EXEC_INPUT_NULL;
269
03fd9c49 270 return std_input;
4f2d528d
LP		 271}
272
03fd9c49 273static int fixup_output(ExecOutput std_output, int socket_fd) {
4f2d528d 274
03fd9c49 275 if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 276 return EXEC_OUTPUT_INHERIT;
277
03fd9c49 278 return std_output;
4f2d528d
LP		 279}
280
1e3ad081 281static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) {
4f2d528d
LP		 282 ExecInput i;
283
284 assert(context);
285
1e3ad081 286 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
4f2d528d
LP		 287
288 switch (i) {
071830ff 289
80876c20
LP		 290 case EXEC_INPUT_NULL:
291 return open_null_as(O_RDONLY, STDIN_FILENO);
292
293 case EXEC_INPUT_TTY:
294 case EXEC_INPUT_TTY_FORCE:
295 case EXEC_INPUT_TTY_FAIL: {
296 int fd, r;
071830ff 297
80876c20
LP		 298 if ((fd = acquire_terminal(
299 tty_path(context),
4f2d528d 300 i == EXEC_INPUT_TTY_FAIL,
21de3988 301 i == EXEC_INPUT_TTY_FORCE,
af6da548
LP		 302 false,
303 (usec_t) -1)) < 0)
80876c20
LP		 304 return fd;
305
306 if (fd != STDIN_FILENO) {
307 r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
071830ff 308 close_nointr_nofail(fd);
80876c20
LP		 309 } else
310 r = STDIN_FILENO;
311
312 return r;
313 }
314
4f2d528d
LP		 315 case EXEC_INPUT_SOCKET:
316 return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
317
80876c20
LP		 318 default:
319 assert_not_reached("Unknown input type");
320 }
321}
322
eb17e935 323static int setup_output(const ExecContext *context, int fileno, int socket_fd, const char *ident, const char *unit_id, bool apply_tty_stdin) {
4f2d528d
LP		 324 ExecOutput o;
325 ExecInput i;
47c1d80d 326 int r;
4f2d528d 327
80876c20
LP		 328 assert(context);
329 assert(ident);
330
1e3ad081 331 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
03fd9c49 332 o = fixup_output(context->std_output, socket_fd);
4f2d528d 333
eb17e935
MS		 334 if (fileno == STDERR_FILENO) {
335 ExecOutput e;
336 e = fixup_output(context->std_error, socket_fd);
80876c20 337
eb17e935
MS		 338 /* This expects the input and output are already set up */
339
340 /* Don't change the stderr file descriptor if we inherit all
341 * the way and are not on a tty */
342 if (e == EXEC_OUTPUT_INHERIT &&
343 o == EXEC_OUTPUT_INHERIT &&
344 i == EXEC_INPUT_NULL &&
345 !is_terminal_input(context->std_input) &&
346 getppid () != 1)
347 return fileno;
348
349 /* Duplicate from stdout if possible */
350 if (e == o || e == EXEC_OUTPUT_INHERIT)
351 return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno;
071830ff 352
eb17e935 353 o = e;
80876c20 354
eb17e935 355 } else if (o == EXEC_OUTPUT_INHERIT) {
21d21ea4
LP		 356 /* If input got downgraded, inherit the original value */
357 if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input))
eb17e935 358 return open_terminal_as(tty_path(context), O_WRONLY, fileno);
21d21ea4 359
acb591e4 360 /* If the input is connected to anything that's not a /dev/null, inherit that... */
ff876e28 361 if (i != EXEC_INPUT_NULL)
eb17e935 362 return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
071830ff 363
acb591e4
LP		 364 /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */
365 if (getppid() != 1)
eb17e935 366 return fileno;
94f04347 367
eb17e935
MS		 368 /* We need to open /dev/null here anew, to get the right access mode. */
369 return open_null_as(O_WRONLY, fileno);
071830ff 370 }
94f04347 371
eb17e935 372 switch (o) {
80876c20
LP		 373
374 case EXEC_OUTPUT_NULL:
eb17e935 375 return open_null_as(O_WRONLY, fileno);
80876c20
LP		 376
377 case EXEC_OUTPUT_TTY:
4f2d528d 378 if (is_terminal_input(i))
eb17e935 379 return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
80876c20
LP		 380
381 /* We don't reset the terminal if this is just about output */
eb17e935 382 return open_terminal_as(tty_path(context), O_WRONLY, fileno);
80876c20
LP		 383
384 case EXEC_OUTPUT_SYSLOG:
28dbc1e8 385 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
9a6bca7a 386 case EXEC_OUTPUT_KMSG:
28dbc1e8 387 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
706343f4
LP		 388 case EXEC_OUTPUT_JOURNAL:
389 case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
eb17e935 390 r = connect_logger_as(context, o, ident, unit_id, fileno);
47c1d80d 391 if (r < 0) {
eb17e935
MS		 392 log_error("Failed to connect std%s of %s to the journal socket: %s",
393 fileno == STDOUT_FILENO ? "out" : "err",
394 unit_id, strerror(-r));
395 r = open_null_as(O_WRONLY, fileno);
47c1d80d
MS		 396 }
397 return r;
4f2d528d
LP		 398
399 case EXEC_OUTPUT_SOCKET:
400 assert(socket_fd >= 0);
eb17e935 401 return dup2(socket_fd, fileno) < 0 ? -errno : fileno;
94f04347
LP		 402
403 default:
80876c20 404 assert_not_reached("Unknown error type");
94f04347 405 }
071830ff
LP		 406}
407
02a51aba
LP		 408static int chown_terminal(int fd, uid_t uid) {
409 struct stat st;
410
411 assert(fd >= 0);
02a51aba
LP		 412
413 /* This might fail. What matters are the results. */
bab45044
LP		 414 (void) fchown(fd, uid, -1);
415 (void) fchmod(fd, TTY_MODE);
02a51aba
LP		 416
417 if (fstat(fd, &st) < 0)
418 return -errno;
419
d8b4e2e9 420 if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
02a51aba
LP		 421 return -EPERM;
422
423 return 0;
424}
425
af6da548 426static int setup_confirm_stdio(int *_saved_stdin,
80876c20
LP		 427 int *_saved_stdout) {
428 int fd = -1, saved_stdin, saved_stdout = -1, r;
429
80876c20
LP		 430 assert(_saved_stdin);
431 assert(_saved_stdout);
432
af6da548
LP		 433 saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3);
434 if (saved_stdin < 0)
435 return -errno;
80876c20 436
af6da548
LP		 437 saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3);
438 if (saved_stdout < 0) {
439 r = errno;
80876c20
LP		 440 goto fail;
441 }
442
af6da548
LP		 443 fd = acquire_terminal(
444 "/dev/console",
445 false,
446 false,
447 false,
448 DEFAULT_CONFIRM_USEC);
449 if (fd < 0) {
450 r = fd;
80876c20
LP		 451 goto fail;
452 }
453
af6da548
LP		 454 r = chown_terminal(fd, getuid());
455 if (r < 0)
02a51aba 456 goto fail;
02a51aba 457
80876c20 458 if (dup2(fd, STDIN_FILENO) < 0) {
af6da548 459 r = -errno;
80876c20
LP		 460 goto fail;
461 }
462
463 if (dup2(fd, STDOUT_FILENO) < 0) {
af6da548 464 r = -errno;
80876c20
LP		 465 goto fail;
466 }
467
468 if (fd >= 2)
469 close_nointr_nofail(fd);
470
471 *_saved_stdin = saved_stdin;
472 *_saved_stdout = saved_stdout;
473
474 return 0;
475
476fail:
477 if (saved_stdout >= 0)
478 close_nointr_nofail(saved_stdout);
479
480 if (saved_stdin >= 0)
481 close_nointr_nofail(saved_stdin);
482
483 if (fd >= 0)
484 close_nointr_nofail(fd);
485
486 return r;
487}
488
af6da548
LP		 489static int write_confirm_message(const char *format, ...) {
490 int fd;
491 va_list ap;
80876c20 492
af6da548 493 assert(format);
80876c20 494
af6da548
LP		 495 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
496 if (fd < 0)
497 return fd;
80876c20 498
af6da548
LP		 499 va_start(ap, format);
500 vdprintf(fd, format, ap);
501 va_end(ap);
80876c20 502
af6da548 503 close_nointr_nofail(fd);
80876c20 504
af6da548
LP		 505 return 0;
506}
80876c20 507
af6da548
LP		 508static int restore_confirm_stdio(int *saved_stdin,
509 int *saved_stdout) {
80876c20 510
af6da548 511 int r = 0;
80876c20 512
af6da548
LP		 513 assert(saved_stdin);
514 assert(saved_stdout);
515
516 release_terminal();
517
518 if (*saved_stdin >= 0)
80876c20 519 if (dup2(*saved_stdin, STDIN_FILENO) < 0)
af6da548 520 r = -errno;
80876c20 521
af6da548 522 if (*saved_stdout >= 0)
80876c20 523 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
af6da548 524 r = -errno;
80876c20 525
af6da548
LP		 526 if (*saved_stdin >= 0)
527 close_nointr_nofail(*saved_stdin);
80876c20 528
af6da548
LP		 529 if (*saved_stdout >= 0)
530 close_nointr_nofail(*saved_stdout);
531
532 return r;
533}
534
535static int ask_for_confirmation(char *response, char **argv) {
536 int saved_stdout = -1, saved_stdin = -1, r;
537 char *line;
538
539 r = setup_confirm_stdio(&saved_stdin, &saved_stdout);
540 if (r < 0)
541 return r;
542
543 line = exec_command_line(argv);
544 if (!line)
545 return -ENOMEM;
546
547 r = ask(response, "yns", "Execute %s? [Yes, No, Skip] ", line);
548 free(line);
549
550 restore_confirm_stdio(&saved_stdin, &saved_stdout);
551
552 return r;
80876c20
LP		 553}
554
81a2b7ce
LP		 555static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
556 bool keep_groups = false;
557 int r;
558
559 assert(context);
560
35b8ca3a 561 /* Lookup and set GID and supplementary group list. Here too
81a2b7ce
LP		 562 * we avoid NSS lookups for gid=0. */
563
564 if (context->group || username) {
565
4b67834e
LP		 566 if (context->group) {
567 const char *g = context->group;
568
569 if ((r = get_group_creds(&g, &gid)) < 0)
81a2b7ce 570 return r;
4b67834e 571 }
81a2b7ce
LP		 572
573 /* First step, initialize groups from /etc/groups */
574 if (username && gid != 0) {
575 if (initgroups(username, gid) < 0)
576 return -errno;
577
578 keep_groups = true;
579 }
580
581 /* Second step, set our gids */
582 if (setresgid(gid, gid, gid) < 0)
583 return -errno;
584 }
585
586 if (context->supplementary_groups) {
587 int ngroups_max, k;
588 gid_t *gids;
589 char **i;
590
591 /* Final step, initialize any manually set supplementary groups */
da19d5c1 592 assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0);
81a2b7ce
LP		 593
594 if (!(gids = new(gid_t, ngroups_max)))
595 return -ENOMEM;
596
597 if (keep_groups) {
598 if ((k = getgroups(ngroups_max, gids)) < 0) {
599 free(gids);
600 return -errno;
601 }
602 } else
603 k = 0;
604
605 STRV_FOREACH(i, context->supplementary_groups) {
4b67834e 606 const char *g;
81a2b7ce
LP		 607
608 if (k >= ngroups_max) {
609 free(gids);
610 return -E2BIG;
611 }
612
4b67834e
LP		 613 g = *i;
614 r = get_group_creds(&g, gids+k);
615 if (r < 0) {
81a2b7ce
LP		 616 free(gids);
617 return r;
618 }
619
620 k++;
621 }
622
623 if (setgroups(k, gids) < 0) {
624 free(gids);
625 return -errno;
626 }
627
628 free(gids);
629 }
630
631 return 0;
632}
633
634static int enforce_user(const ExecContext *context, uid_t uid) {
635 int r;
636 assert(context);
637
638 /* Sets (but doesn't lookup) the uid and make sure we keep the
639 * capabilities while doing so. */
640
641 if (context->capabilities) {
642 cap_t d;
643 static const cap_value_t bits[] = {
644 CAP_SETUID, /* Necessary so that we can run setresuid() below */
645 CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */
646 };
647
648 /* First step: If we need to keep capabilities but
649 * drop privileges we need to make sure we keep our
35b8ca3a 650 * caps, whiel we drop privileges. */
693ced48
LP		 651 if (uid != 0) {
652 int sb = context->secure_bits|SECURE_KEEP_CAPS;
653
654 if (prctl(PR_GET_SECUREBITS) != sb)
655 if (prctl(PR_SET_SECUREBITS, sb) < 0)
656 return -errno;
657 }
81a2b7ce 658
35b8ca3a 659 /* Second step: set the capabilities. This will reduce
81a2b7ce
LP		 660 * the capabilities to the minimum we need. */
661
662 if (!(d = cap_dup(context->capabilities)))
663 return -errno;
664
665 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
666 cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) {
667 r = -errno;
668 cap_free(d);
669 return r;
670 }
671
672 if (cap_set_proc(d) < 0) {
673 r = -errno;
674 cap_free(d);
675 return r;
676 }
677
678 cap_free(d);
679 }
680
681 /* Third step: actually set the uids */
682 if (setresuid(uid, uid, uid) < 0)
683 return -errno;
684
685 /* At this point we should have all necessary capabilities but
686 are otherwise a normal user. However, the caps might got
687 corrupted due to the setresuid() so we need clean them up
688 later. This is done outside of this call. */
689
690 return 0;
691}
692
5b6319dc
LP		 693#ifdef HAVE_PAM
694
695static int null_conv(
696 int num_msg,
697 const struct pam_message **msg,
698 struct pam_response **resp,
699 void *appdata_ptr) {
700
701 /* We don't support conversations */
702
703 return PAM_CONV_ERR;
704}
705
706static int setup_pam(
707 const char *name,
708 const char *user,
940c5210 709 uid_t uid,
5b6319dc
LP		 710 const char *tty,
711 char ***pam_env,
712 int fds[], unsigned n_fds) {
713
714 static const struct pam_conv conv = {
715 .conv = null_conv,
716 .appdata_ptr = NULL
717 };
718
719 pam_handle_t *handle = NULL;
720 sigset_t ss, old_ss;
721 int pam_code = PAM_SUCCESS;
9ba35398 722 int err;
5b6319dc
LP		 723 char **e = NULL;
724 bool close_session = false;
725 pid_t pam_pid = 0, parent_pid;
726
727 assert(name);
728 assert(user);
729 assert(pam_env);
730
731 /* We set up PAM in the parent process, then fork. The child
35b8ca3a 732 * will then stay around until killed via PR_GET_PDEATHSIG or
5b6319dc
LP		 733 * systemd via the cgroup logic. It will then remove the PAM
734 * session again. The parent process will exec() the actual
735 * daemon. We do things this way to ensure that the main PID
736 * of the daemon is the one we initially fork()ed. */
737
738 if ((pam_code = pam_start(name, user, &conv, &handle)) != PAM_SUCCESS) {
739 handle = NULL;
740 goto fail;
741 }
742
743 if (tty)
744 if ((pam_code = pam_set_item(handle, PAM_TTY, tty)) != PAM_SUCCESS)
745 goto fail;
746
747 if ((pam_code = pam_acct_mgmt(handle, PAM_SILENT)) != PAM_SUCCESS)
748 goto fail;
749
750 if ((pam_code = pam_open_session(handle, PAM_SILENT)) != PAM_SUCCESS)
751 goto fail;
752
753 close_session = true;
754
5b6319dc
LP		 755 if ((!(e = pam_getenvlist(handle)))) {
756 pam_code = PAM_BUF_ERR;
757 goto fail;
758 }
759
760 /* Block SIGTERM, so that we know that it won't get lost in
761 * the child */
762 if (sigemptyset(&ss) < 0 ||
763 sigaddset(&ss, SIGTERM) < 0 ||
764 sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0)
765 goto fail;
766
767 parent_pid = getpid();
768
769 if ((pam_pid = fork()) < 0)
770 goto fail;
771
772 if (pam_pid == 0) {
773 int sig;
774 int r = EXIT_PAM;
775
776 /* The child's job is to reset the PAM session on
777 * termination */
778
779 /* This string must fit in 10 chars (i.e. the length
5d6b1584
LP		 780 * of "/sbin/init"), to look pretty in /bin/ps */
781 rename_process("(sd-pam)");
5b6319dc
LP		 782
783 /* Make sure we don't keep open the passed fds in this
784 child. We assume that otherwise only those fds are
785 open here that have been opened by PAM. */
786 close_many(fds, n_fds);
787
940c5210
AK		 788 /* Drop privileges - we don't need any to pam_close_session
789 * and this will make PR_SET_PDEATHSIG work in most cases.
790 * If this fails, ignore the error - but expect sd-pam threads
791 * to fail to exit normally */
792 if (setresuid(uid, uid, uid) < 0)
793 log_error("Error: Failed to setresuid() in sd-pam: %s", strerror(-r));
794
795 /* Wait until our parent died. This will only work if
796 * the above setresuid() succeeds, otherwise the kernel
797 * will not allow unprivileged parents kill their privileged
798 * children this way. We rely on the control groups kill logic
5b6319dc
LP		 799 * to do the rest for us. */
800 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
801 goto child_finish;
802
803 /* Check if our parent process might already have
804 * died? */
805 if (getppid() == parent_pid) {
3dead8d9
LP		 806 for (;;) {
807 if (sigwait(&ss, &sig) < 0) {
808 if (errno == EINTR)
809 continue;
810
811 goto child_finish;
812 }
5b6319dc 813
3dead8d9
LP		 814 assert(sig == SIGTERM);
815 break;
816 }
5b6319dc
LP		 817 }
818
3dead8d9 819 /* If our parent died we'll end the session */
5b6319dc
LP		 820 if (getppid() != parent_pid)
821 if ((pam_code = pam_close_session(handle, PAM_DATA_SILENT)) != PAM_SUCCESS)
822 goto child_finish;
823
824 r = 0;
825
826 child_finish:
827 pam_end(handle, pam_code | PAM_DATA_SILENT);
828 _exit(r);
829 }
830
831 /* If the child was forked off successfully it will do all the
832 * cleanups, so forget about the handle here. */
833 handle = NULL;
834
3b8bddde 835 /* Unblock SIGTERM again in the parent */
5b6319dc
LP		 836 if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0)
837 goto fail;
838
839 /* We close the log explicitly here, since the PAM modules
840 * might have opened it, but we don't want this fd around. */
841 closelog();
842
aa87e624
LP		 843 *pam_env = e;
844 e = NULL;
845
5b6319dc
LP		 846 return 0;
847
848fail:
9ba35398
MS		 849 if (pam_code != PAM_SUCCESS)
850 err = -EPERM; /* PAM errors do not map to errno */
851 else
852 err = -errno;
853
5b6319dc
LP		 854 if (handle) {
855 if (close_session)
856 pam_code = pam_close_session(handle, PAM_DATA_SILENT);
857
858 pam_end(handle, pam_code | PAM_DATA_SILENT);
859 }
860
861 strv_free(e);
862
863 closelog();
864
430c18ed 865 if (pam_pid > 1) {
5b6319dc 866 kill(pam_pid, SIGTERM);
430c18ed
LP		 867 kill(pam_pid, SIGCONT);
868 }
5b6319dc 869
9ba35398 870 return err;
5b6319dc
LP		 871}
872#endif
873
5d6b1584
LP		 874static void rename_process_from_path(const char *path) {
875 char process_name[11];
876 const char *p;
877 size_t l;
878
879 /* This resulting string must fit in 10 chars (i.e. the length
880 * of "/sbin/init") to look pretty in /bin/ps */
881
9eb977db 882 p = path_get_file_name(path);
5d6b1584
LP		 883 if (isempty(p)) {
884 rename_process("(...)");
885 return;
886 }
887
888 l = strlen(p);
889 if (l > 8) {
890 /* The end of the process name is usually more
891 * interesting, since the first bit might just be
892 * "systemd-" */
893 p = p + l - 8;
894 l = 8;
895 }
896
897 process_name[0] = '(';
898 memcpy(process_name+1, p, l);
899 process_name[1+l] = ')';
900 process_name[1+l+1] = 0;
901
902 rename_process(process_name);
903}
904
8351ceae
LP		 905static int apply_seccomp(uint32_t *syscall_filter) {
906 static const struct sock_filter header[] = {
907 VALIDATE_ARCHITECTURE,
908 EXAMINE_SYSCALL
909 };
910 static const struct sock_filter footer[] = {
911 _KILL_PROCESS
912 };
913
914 int i;
915 unsigned n;
916 struct sock_filter *f;
917 struct sock_fprog prog;
918
919 assert(syscall_filter);
920
921 /* First: count the syscalls to check for */
922 for (i = 0, n = 0; i < syscall_max(); i++)
923 if (syscall_filter[i >> 4] & (1 << (i & 31)))
924 n++;
925
926 /* Second: build the filter program from a header the syscall
927 * matches and the footer */
928 f = alloca(sizeof(struct sock_filter) * (ELEMENTSOF(header) + 2*n + ELEMENTSOF(footer)));
929 memcpy(f, header, sizeof(header));
930
931 for (i = 0, n = 0; i < syscall_max(); i++)
932 if (syscall_filter[i >> 4] & (1 << (i & 31))) {
933 struct sock_filter item[] = {
843fc7f7 934 BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, INDEX_TO_SYSCALL(i), 0, 1),
8351ceae
LP		 935 BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW)
936 };
937
938 assert_cc(ELEMENTSOF(item) == 2);
939
940 f[ELEMENTSOF(header) + 2*n] = item[0];
941 f[ELEMENTSOF(header) + 2*n+1] = item[1];
942
943 n++;
944 }
945
946 memcpy(f + (ELEMENTSOF(header) + 2*n), footer, sizeof(footer));
947
948 /* Third: install the filter */
949 zero(prog);
950 prog.len = ELEMENTSOF(header) + ELEMENTSOF(footer) + 2*n;
951 prog.filter = f;
952 if (prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog) < 0)
953 return -errno;
954
955 return 0;
956}
957
9fb86720 958int exec_spawn(ExecCommand *command,
9e2f7c11 959 char **argv,
81a2b7ce 960 const ExecContext *context,
c2748801 961 int fds[], unsigned n_fds,
1137a57c 962 char **environment,
81a2b7ce
LP		 963 bool apply_permissions,
964 bool apply_chroot,
1e3ad081 965 bool apply_tty_stdin,
80876c20 966 bool confirm_spawn,
8e274523 967 CGroupBonding *cgroup_bondings,
ab1f0633 968 CGroupAttribute *cgroup_attributes,
ecedd90f 969 const char *cgroup_suffix,
62bca2c6 970 const char *unit_id,
f2b68789 971 int idle_pipe[2],
81a2b7ce
LP		 972 pid_t *ret) {
973
034c6ed7 974 pid_t pid;
8e274523 975 int r;
1a63a750 976 char *line;
4f2d528d 977 int socket_fd;
b66871da 978 char _cleanup_strv_free_ **files_env = NULL;
034c6ed7 979
5cb5a6ff
LP		 980 assert(command);
981 assert(context);
982 assert(ret);
034c6ed7
LP		 983 assert(fds || n_fds <= 0);
984
4f2d528d
LP		 985 if (context->std_input == EXEC_INPUT_SOCKET ||
986 context->std_output == EXEC_OUTPUT_SOCKET ||
987 context->std_error == EXEC_OUTPUT_SOCKET) {
988
989 if (n_fds != 1)
990 return -EINVAL;
991
992 socket_fd = fds[0];
993
994 fds = NULL;
995 n_fds = 0;
996 } else
997 socket_fd = -1;
998
b66871da
ZJS		 999 r = exec_context_load_environment(context, &files_env);
1000 if (r < 0) {
bbc9006e
MT		 1001 log_struct_unit(LOG_ERR,
1002 unit_id,
23635a85
ZJS		 1003 "MESSAGE=Failed to load environment files: %s", strerror(-r),
1004 "ERRNO=%d", -r,
1005 NULL);
8c7be95e
LP		 1006 return r;
1007 }
1008
9e2f7c11
LP		 1009 if (!argv)
1010 argv = command->argv;
1011
af6da548 1012 line = exec_command_line(argv);
b66871da
ZJS		 1013 if (!line)
1014 return log_oom();
1a63a750 1015
bbc9006e
MT		 1016 log_struct_unit(LOG_DEBUG,
1017 unit_id,
23635a85
ZJS		 1018 "MESSAGE=About to execute %s", line,
1019 NULL);
1a63a750 1020 free(line);
acbb0225 1021
ab1f0633
LP		 1022 r = cgroup_bonding_realize_list(cgroup_bondings);
1023 if (r < 0)
b66871da 1024 return r;
ab1f0633
LP		 1025
1026 cgroup_attribute_apply_list(cgroup_attributes, cgroup_bondings);
8e274523 1027
b66871da
ZJS		 1028 pid = fork();
1029 if (pid < 0)
1030 return -errno;
034c6ed7
LP		 1031
1032 if (pid == 0) {
4c2630eb 1033 int i, err;
309bff19 1034 sigset_t ss;
81a2b7ce
LP		 1035 const char *username = NULL, *home = NULL;
1036 uid_t uid = (uid_t) -1;
1037 gid_t gid = (gid_t) -1;
b66871da
ZJS		 1038 char _cleanup_strv_free_ **our_env = NULL, **pam_env = NULL,
1039 **final_env = NULL, **final_argv = NULL;
81a2b7ce 1040 unsigned n_env = 0;
af6da548 1041 bool set_access = false;
309bff19 1042
034c6ed7 1043 /* child */
5cb5a6ff 1044
5d6b1584 1045 rename_process_from_path(command->path);
5b6319dc 1046
1b91d3e8
LP		 1047 /* We reset exactly these signals, since they are the
1048 * only ones we set to SIG_IGN in the main daemon. All
1049 * others we leave untouched because we set them to
1050 * SIG_DFL or a valid handler initially, both of which
1051 * will be demoted to SIG_DFL. */
1052 default_signals(SIGNALS_CRASH_HANDLER,
9a34ec5f 1053 SIGNALS_IGNORE, -1);
7b683879 1054
353e12c2
LP		 1055 if (context->ignore_sigpipe)
1056 ignore_signals(SIGPIPE, -1);
1057
1058 assert_se(sigemptyset(&ss) == 0);
1059 if (sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
4c2630eb 1060 err = -errno;
309bff19 1061 r = EXIT_SIGNAL_MASK;
8c7be95e 1062 goto fail_child;
309bff19
LP		 1063 }
1064
f2b68789
LP		 1065 if (idle_pipe) {
1066 if (idle_pipe[1] >= 0)
1067 close_nointr_nofail(idle_pipe[1]);
1068 if (idle_pipe[0] >= 0) {
e6a26745 1069 fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC);
f2b68789
LP		 1070 close_nointr_nofail(idle_pipe[0]);
1071 }
1072 }
1073
85d73053
LP		 1074 /* Close sockets very early to make sure we don't
1075 * block init reexecution because it cannot bind its
1076 * sockets */
4d8a7798 1077 log_forget_fds();
4c2630eb
MS		 1078 err = close_all_fds(socket_fd >= 0 ? &socket_fd : fds,
1079 socket_fd >= 0 ? 1 : n_fds);
1080 if (err < 0) {
fc9b2a84 1081 r = EXIT_FDS;
8c7be95e 1082 goto fail_child;
fc9b2a84
LP		 1083 }
1084
74922904 1085 if (!context->same_pgrp)
8d567588 1086 if (setsid() < 0) {
4c2630eb 1087 err = -errno;
8d567588 1088 r = EXIT_SETSID;
8c7be95e 1089 goto fail_child;
8d567588 1090 }
80876c20 1091
c5da34ef
LP		 1092 if (context->tcpwrap_name) {
1093 if (socket_fd >= 0)
1094 if (!socket_tcpwrap(socket_fd, context->tcpwrap_name)) {
4c2630eb 1095 err = -EACCES;
c5da34ef 1096 r = EXIT_TCPWRAP;
8c7be95e 1097 goto fail_child;
c5da34ef
LP		 1098 }
1099
1100 for (i = 0; i < (int) n_fds; i++) {
1101 if (!socket_tcpwrap(fds[i], context->tcpwrap_name)) {
4c2630eb 1102 err = -EACCES;
c5da34ef 1103 r = EXIT_TCPWRAP;
8c7be95e 1104 goto fail_child;
c5da34ef 1105 }
df1f0afe 1106 }
c5da34ef 1107 }
df1f0afe 1108
6ea832a2
LP		 1109 exec_context_tty_reset(context);
1110
af6da548 1111 if (confirm_spawn) {
80876c20
LP		 1112 char response;
1113
af6da548
LP		 1114 err = ask_for_confirmation(&response, argv);
1115 if (err == -ETIMEDOUT)
1116 write_confirm_message("Confirmation question timed out, assuming positive response.\n");
1117 else if (err < 0)
1118 write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-err));
1119 else if (response == 's') {
1120 write_confirm_message("Skipping execution.\n");
4c2630eb 1121 err = -ECANCELED;
80876c20 1122 r = EXIT_CONFIRM;
8c7be95e 1123 goto fail_child;
af6da548
LP		 1124 } else if (response == 'n') {
1125 write_confirm_message("Failing execution.\n");
4c2630eb 1126 err = r = 0;
8c7be95e 1127 goto fail_child;
ee2b4894 1128 }
034c6ed7
LP		 1129 }
1130
da726a4d
LP		 1131 /* If a socket is connected to STDIN/STDOUT/STDERR, we
1132 * must sure to drop O_NONBLOCK */
1133 if (socket_fd >= 0)
1134 fd_nonblock(socket_fd, false);
1135
af6da548
LP		 1136 err = setup_input(context, socket_fd, apply_tty_stdin);
1137 if (err < 0) {
1138 r = EXIT_STDIN;
1139 goto fail_child;
4c2630eb 1140 }
9eba9da4 1141
eb17e935 1142 err = setup_output(context, STDOUT_FILENO, socket_fd, path_get_file_name(command->path), unit_id, apply_tty_stdin);
af6da548
LP		 1143 if (err < 0) {
1144 r = EXIT_STDOUT;
1145 goto fail_child;
4c2630eb 1146 }
94f04347 1147
eb17e935 1148 err = setup_output(context, STDERR_FILENO, socket_fd, path_get_file_name(command->path), unit_id, apply_tty_stdin);
4c2630eb 1149 if (err < 0) {
80876c20 1150 r = EXIT_STDERR;
8c7be95e 1151 goto fail_child;
071830ff
LP		 1152 }
1153
4c2630eb 1154 if (cgroup_bondings) {
ecedd90f 1155 err = cgroup_bonding_install_list(cgroup_bondings, 0, cgroup_suffix);
4c2630eb 1156 if (err < 0) {
8e274523 1157 r = EXIT_CGROUP;
8c7be95e 1158 goto fail_child;
8e274523 1159 }
4c2630eb 1160 }
8e274523 1161
dd6c17b1 1162 if (context->oom_score_adjust_set) {
fb33a393 1163 char t[16];
034c6ed7 1164
dd6c17b1 1165 snprintf(t, sizeof(t), "%i", context->oom_score_adjust);
fb33a393 1166 char_array_0(t);
034c6ed7 1167
dd6c17b1 1168 if (write_one_line_file("/proc/self/oom_score_adj", t) < 0) {
8600c525
KS		 1169 err = -errno;
1170 r = EXIT_OOM_ADJUST;
1171 goto fail_child;
fb33a393 1172 }
034c6ed7
LP		 1173 }
1174
fb33a393
LP		 1175 if (context->nice_set)
1176 if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
4c2630eb 1177 err = -errno;
fb33a393 1178 r = EXIT_NICE;
8c7be95e 1179 goto fail_child;
fb33a393
LP		 1180 }
1181
94f04347
LP		 1182 if (context->cpu_sched_set) {
1183 struct sched_param param;
1184
1185 zero(param);
1186 param.sched_priority = context->cpu_sched_priority;
1187
38b48754
LP		 1188 if (sched_setscheduler(0, context->cpu_sched_policy |
1189 (context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), &param) < 0) {
4c2630eb 1190 err = -errno;
94f04347 1191 r = EXIT_SETSCHEDULER;
8c7be95e 1192 goto fail_child;
94f04347
LP		 1193 }
1194 }
1195
82c121a4
LP		 1196 if (context->cpuset)
1197 if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
4c2630eb 1198 err = -errno;
94f04347 1199 r = EXIT_CPUAFFINITY;
8c7be95e 1200 goto fail_child;
94f04347
LP		 1201 }
1202
9eba9da4
LP		 1203 if (context->ioprio_set)
1204 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
4c2630eb 1205 err = -errno;
9eba9da4 1206 r = EXIT_IOPRIO;
8c7be95e 1207 goto fail_child;
9eba9da4
LP		 1208 }
1209
d88a251b 1210 if (context->timer_slack_nsec != (nsec_t) -1)
03fae018 1211 if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
4c2630eb 1212 err = -errno;
94f04347 1213 r = EXIT_TIMERSLACK;
8c7be95e 1214 goto fail_child;
94f04347
LP		 1215 }
1216
169c1bda 1217 if (context->utmp_id)
0ad26e09 1218 utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path);
169c1bda 1219
81a2b7ce
LP		 1220 if (context->user) {
1221 username = context->user;
d05c5031 1222 err = get_user_creds(&username, &uid, &gid, &home, NULL);
4c2630eb 1223 if (err < 0) {
81a2b7ce 1224 r = EXIT_USER;
8c7be95e 1225 goto fail_child;
81a2b7ce 1226 }
d8b4e2e9 1227
4c2630eb
MS		 1228 if (is_terminal_input(context->std_input)) {
1229 err = chown_terminal(STDIN_FILENO, uid);
1230 if (err < 0) {
d8b4e2e9 1231 r = EXIT_STDIN;
8c7be95e 1232 goto fail_child;
d8b4e2e9 1233 }
4c2630eb 1234 }
64747e2d 1235
4c2630eb
MS		 1236 if (cgroup_bondings && context->control_group_modify) {
1237 err = cgroup_bonding_set_group_access_list(cgroup_bondings, 0755, uid, gid);
1238 if (err >= 0)
891703e1 1239 err = cgroup_bonding_set_task_access_list(cgroup_bondings, 0644, uid, gid, context->control_group_persistent);
4c2630eb 1240 if (err < 0) {
64747e2d
LP		 1241 r = EXIT_CGROUP;
1242 goto fail_child;
1243 }
8d53b453
LP		 1244
1245 set_access = true;
1246 }
1247 }
1248
891703e1
KS		 1249 if (cgroup_bondings && !set_access && context->control_group_persistent >= 0) {
1250 err = cgroup_bonding_set_task_access_list(cgroup_bondings, (mode_t) -1, (uid_t) -1, (uid_t) -1, context->control_group_persistent);
8d53b453
LP		 1251 if (err < 0) {
1252 r = EXIT_CGROUP;
1253 goto fail_child;
4c2630eb 1254 }
81a2b7ce
LP		 1255 }
1256
4c2630eb
MS		 1257 if (apply_permissions) {
1258 err = enforce_groups(context, username, gid);
1259 if (err < 0) {
3b8bddde
LP		 1260 r = EXIT_GROUP;
1261 goto fail_child;
1262 }
4c2630eb 1263 }
3b8bddde
LP		 1264
1265 umask(context->umask);
1266
5b6319dc 1267#ifdef HAVE_PAM
b7848021 1268 if (apply_permissions && context->pam_name && username) {
940c5210 1269 err = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds);
4c2630eb 1270 if (err < 0) {
5b6319dc 1271 r = EXIT_PAM;
8c7be95e 1272 goto fail_child;
5b6319dc
LP		 1273 }
1274 }
1275#endif
ff01d048
LP		 1276 if (context->private_network) {
1277 if (unshare(CLONE_NEWNET) < 0) {
4c2630eb 1278 err = -errno;
ff01d048
LP		 1279 r = EXIT_NETWORK;
1280 goto fail_child;
1281 }
1282
1283 loopback_setup();
1284 }
5b6319dc 1285
04aa0cb9
LP		 1286 if (strv_length(context->read_write_dirs) > 0 ||
1287 strv_length(context->read_only_dirs) > 0 ||
1288 strv_length(context->inaccessible_dirs) > 0 ||
ac0930c8 1289 context->mount_flags != 0 ||
4c2630eb
MS		 1290 context->private_tmp) {
1291 err = setup_namespace(context->read_write_dirs,
1292 context->read_only_dirs,
1293 context->inaccessible_dirs,
1294 context->private_tmp,
1295 context->mount_flags);
1296 if (err < 0) {
1297 r = EXIT_NAMESPACE;
8c7be95e 1298 goto fail_child;
4c2630eb
MS		 1299 }
1300 }
04aa0cb9 1301
81a2b7ce
LP		 1302 if (apply_chroot) {
1303 if (context->root_directory)
1304 if (chroot(context->root_directory) < 0) {
4c2630eb 1305 err = -errno;
81a2b7ce 1306 r = EXIT_CHROOT;
8c7be95e 1307 goto fail_child;
81a2b7ce
LP		 1308 }
1309
1310 if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
4c2630eb 1311 err = -errno;
81a2b7ce 1312 r = EXIT_CHDIR;
8c7be95e 1313 goto fail_child;
81a2b7ce
LP		 1314 }
1315 } else {
b66871da 1316 char _cleanup_free_ *d = NULL;
81a2b7ce
LP		 1317
1318 if (asprintf(&d, "%s/%s",
1319 context->root_directory ? context->root_directory : "",
1320 context->working_directory ? context->working_directory : "") < 0) {
4c2630eb 1321 err = -ENOMEM;
81a2b7ce 1322 r = EXIT_MEMORY;
8c7be95e 1323 goto fail_child;
81a2b7ce
LP		 1324 }
1325
1326 if (chdir(d) < 0) {
4c2630eb 1327 err = -errno;
81a2b7ce 1328 r = EXIT_CHDIR;
8c7be95e 1329 goto fail_child;
81a2b7ce 1330 }
81a2b7ce
LP		 1331 }
1332
fc9b2a84
LP		 1333 /* We repeat the fd closing here, to make sure that
1334 * nothing is leaked from the PAM modules */
4c2630eb
MS		 1335 err = close_all_fds(fds, n_fds);
1336 if (err >= 0)
1337 err = shift_fds(fds, n_fds);
1338 if (err >= 0)
1339 err = flags_fds(fds, n_fds, context->non_blocking);
1340 if (err < 0) {
034c6ed7 1341 r = EXIT_FDS;
8c7be95e 1342 goto fail_child;
034c6ed7
LP		 1343 }
1344
81a2b7ce 1345 if (apply_permissions) {
034c6ed7 1346
81a2b7ce
LP		 1347 for (i = 0; i < RLIMIT_NLIMITS; i++) {
1348 if (!context->rlimit[i])
1349 continue;
1350
68faf98c 1351 if (setrlimit_closest(i, context->rlimit[i]) < 0) {
4c2630eb 1352 err = -errno;
81a2b7ce 1353 r = EXIT_LIMITS;
8c7be95e 1354 goto fail_child;
81a2b7ce 1355 }
034c6ed7 1356 }
034c6ed7 1357
4c2630eb 1358 if (context->capability_bounding_set_drop) {
ec8927ca 1359 err = capability_bounding_set_drop(context->capability_bounding_set_drop, false);
4c2630eb 1360 if (err < 0) {
73090dc8
LP		 1361 r = EXIT_CAPABILITIES;
1362 goto fail_child;
1363 }
4c2630eb 1364 }
260abb78 1365
4c2630eb
MS		 1366 if (context->user) {
1367 err = enforce_user(context, uid);
1368 if (err < 0) {
81a2b7ce 1369 r = EXIT_USER;
8c7be95e 1370 goto fail_child;
81a2b7ce 1371 }
4c2630eb 1372 }
81a2b7ce 1373
35b8ca3a 1374 /* PR_GET_SECUREBITS is not privileged, while
693ced48
LP		 1375 * PR_SET_SECUREBITS is. So to suppress
1376 * potential EPERMs we'll try not to call
1377 * PR_SET_SECUREBITS unless necessary. */
1378 if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
1379 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
4c2630eb 1380 err = -errno;
693ced48 1381 r = EXIT_SECUREBITS;
8c7be95e 1382 goto fail_child;
693ced48 1383 }
81a2b7ce
LP		 1384
1385 if (context->capabilities)
1386 if (cap_set_proc(context->capabilities) < 0) {
4c2630eb 1387 err = -errno;
81a2b7ce 1388 r = EXIT_CAPABILITIES;
8c7be95e 1389 goto fail_child;
81a2b7ce 1390 }
8351ceae
LP		 1391
1392 if (context->no_new_privileges)
1393 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
1394 err = -errno;
1395 r = EXIT_NO_NEW_PRIVILEGES;
1396 goto fail_child;
1397 }
1398
1399 if (context->syscall_filter) {
1400 err = apply_seccomp(context->syscall_filter);
1401 if (err < 0) {
1402 r = EXIT_SECCOMP;
1403 goto fail_child;
1404 }
1405 }
94f04347
LP		 1406 }
1407
e3aa71c3 1408 if (!(our_env = new0(char*, 7))) {
4c2630eb 1409 err = -ENOMEM;
81a2b7ce 1410 r = EXIT_MEMORY;
8c7be95e 1411 goto fail_child;
81a2b7ce 1412 }
034c6ed7 1413
81a2b7ce 1414 if (n_fds > 0)
bb00e604 1415 if (asprintf(our_env + n_env++, "LISTEN_PID=%lu", (unsigned long) getpid()) < 0 ||
81a2b7ce 1416 asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0) {
4c2630eb 1417 err = -ENOMEM;
81a2b7ce 1418 r = EXIT_MEMORY;
8c7be95e 1419 goto fail_child;
81a2b7ce 1420 }
034c6ed7 1421
81a2b7ce
LP		 1422 if (home)
1423 if (asprintf(our_env + n_env++, "HOME=%s", home) < 0) {
4c2630eb 1424 err = -ENOMEM;
81a2b7ce 1425 r = EXIT_MEMORY;
8c7be95e 1426 goto fail_child;
81a2b7ce 1427 }
034c6ed7 1428
81a2b7ce
LP		 1429 if (username)
1430 if (asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 ||
1431 asprintf(our_env + n_env++, "USER=%s", username) < 0) {
4c2630eb 1432 err = -ENOMEM;
81a2b7ce 1433 r = EXIT_MEMORY;
8c7be95e 1434 goto fail_child;
81a2b7ce 1435 }
034c6ed7 1436
e3aa71c3
LP		 1437 if (is_terminal_input(context->std_input) ||
1438 context->std_output == EXEC_OUTPUT_TTY ||
1439 context->std_error == EXEC_OUTPUT_TTY)
1440 if (!(our_env[n_env++] = strdup(default_term_for_tty(tty_path(context))))) {
4c2630eb 1441 err = -ENOMEM;
e3aa71c3 1442 r = EXIT_MEMORY;
8c7be95e 1443 goto fail_child;
e3aa71c3
LP		 1444 }
1445
1446 assert(n_env <= 7);
4e85aff4 1447
5b6319dc 1448 if (!(final_env = strv_env_merge(
8c7be95e 1449 5,
5b6319dc
LP		 1450 environment,
1451 our_env,
1452 context->environment,
8c7be95e 1453 files_env,
5b6319dc
LP		 1454 pam_env,
1455 NULL))) {
4c2630eb 1456 err = -ENOMEM;
81a2b7ce 1457 r = EXIT_MEMORY;
8c7be95e 1458 goto fail_child;
81a2b7ce 1459 }
034c6ed7 1460
fab56fc5 1461 if (!(final_argv = replace_env_argv(argv, final_env))) {
4c2630eb 1462 err = -ENOMEM;
fab56fc5 1463 r = EXIT_MEMORY;
8c7be95e 1464 goto fail_child;
fab56fc5
LP		 1465 }
1466
a6ff950e
LP		 1467 final_env = strv_env_clean(final_env);
1468
fab56fc5 1469 execve(command->path, final_argv, final_env);
4c2630eb 1470 err = -errno;
034c6ed7
LP		 1471 r = EXIT_EXEC;
1472
8c7be95e 1473 fail_child:
4c2630eb
MS		 1474 if (r != 0) {
1475 log_open();
23635a85
ZJS		 1476 log_struct(LOG_ERR, MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED),
1477 "EXECUTABLE=%s", command->path,
1478 "MESSAGE=Failed at step %s spawning %s: %s",
1479 exit_status_to_string(r, EXIT_STATUS_SYSTEMD),
1480 command->path, strerror(-err),
1481 "ERRNO=%d", -err,
1482 NULL);
1483 log_close();
4c2630eb
MS		 1484 }
1485
034c6ed7
LP		 1486 _exit(r);
1487 }
1488
bbc9006e
MT		 1489 log_struct_unit(LOG_DEBUG,
1490 unit_id,
23635a85
ZJS		 1491 "MESSAGE=Forked %s as %lu",
1492 command->path, (unsigned long) pid,
1493 NULL);
1494
80876c20
LP		 1495 /* We add the new process to the cgroup both in the child (so
1496 * that we can be sure that no user code is ever executed
1497 * outside of the cgroup) and in the parent (so that we can be
1498 * sure that when we kill the cgroup the process will be
1499 * killed too). */
1500 if (cgroup_bondings)
ecedd90f 1501 cgroup_bonding_install_list(cgroup_bondings, pid, cgroup_suffix);
2da3263a 1502
b58b4116 1503 exec_status_start(&command->exec_status, pid);
9fb86720 1504
034c6ed7 1505 *ret = pid;
5cb5a6ff
LP		 1506 return 0;
1507}
1508
034c6ed7
LP		 1509void exec_context_init(ExecContext *c) {
1510 assert(c);
1511
4c12626c 1512 c->umask = 0022;
9eba9da4 1513 c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
94f04347 1514 c->cpu_sched_policy = SCHED_OTHER;
071830ff 1515 c->syslog_priority = LOG_DAEMON|LOG_INFO;
74922904 1516 c->syslog_level_prefix = true;
891703e1 1517 c->control_group_persistent = -1;
353e12c2 1518 c->ignore_sigpipe = true;
d88a251b 1519 c->timer_slack_nsec = (nsec_t) -1;
034c6ed7
LP		 1520}
1521
1522void exec_context_done(ExecContext *c) {
5cb5a6ff
LP		 1523 unsigned l;
1524
1525 assert(c);
1526
1527 strv_free(c->environment);
034c6ed7 1528 c->environment = NULL;
5cb5a6ff 1529
8c7be95e
LP		 1530 strv_free(c->environment_files);
1531 c->environment_files = NULL;
1532
034c6ed7 1533 for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
5cb5a6ff 1534 free(c->rlimit[l]);
034c6ed7
LP		 1535 c->rlimit[l] = NULL;
1536 }
1537
9eba9da4
LP		 1538 free(c->working_directory);
1539 c->working_directory = NULL;
1540 free(c->root_directory);
1541 c->root_directory = NULL;
5cb5a6ff 1542
80876c20
LP		 1543 free(c->tty_path);
1544 c->tty_path = NULL;
1545
df1f0afe
LP		 1546 free(c->tcpwrap_name);
1547 c->tcpwrap_name = NULL;
1548
071830ff
LP		 1549 free(c->syslog_identifier);
1550 c->syslog_identifier = NULL;
1551
5cb5a6ff 1552 free(c->user);
034c6ed7
LP		 1553 c->user = NULL;
1554
5cb5a6ff 1555 free(c->group);
034c6ed7
LP		 1556 c->group = NULL;
1557
1558 strv_free(c->supplementary_groups);
1559 c->supplementary_groups = NULL;
94f04347 1560
5b6319dc
LP		 1561 free(c->pam_name);
1562 c->pam_name = NULL;
1563
94f04347
LP		 1564 if (c->capabilities) {
1565 cap_free(c->capabilities);
1566 c->capabilities = NULL;
1567 }
15ae422b
LP		 1568
1569 strv_free(c->read_only_dirs);
1570 c->read_only_dirs = NULL;
1571
1572 strv_free(c->read_write_dirs);
1573 c->read_write_dirs = NULL;
1574
1575 strv_free(c->inaccessible_dirs);
1576 c->inaccessible_dirs = NULL;
82c121a4
LP		 1577
1578 if (c->cpuset)
1579 CPU_FREE(c->cpuset);
86a3475b
LP		 1580
1581 free(c->utmp_id);
1582 c->utmp_id = NULL;
b9a0e010
LP		 1583
1584 free(c->syscall_filter);
1585 c->syscall_filter = NULL;
5cb5a6ff
LP		 1586}
1587
43d0fcbd
LP		 1588void exec_command_done(ExecCommand *c) {
1589 assert(c);
1590
1591 free(c->path);
1592 c->path = NULL;
1593
1594 strv_free(c->argv);
1595 c->argv = NULL;
1596}
1597
1598void exec_command_done_array(ExecCommand *c, unsigned n) {
1599 unsigned i;
1600
1601 for (i = 0; i < n; i++)
1602 exec_command_done(c+i);
1603}
1604
5cb5a6ff
LP		 1605void exec_command_free_list(ExecCommand *c) {
1606 ExecCommand *i;
1607
1608 while ((i = c)) {
034c6ed7 1609 LIST_REMOVE(ExecCommand, command, c, i);
43d0fcbd 1610 exec_command_done(i);
5cb5a6ff
LP		 1611 free(i);
1612 }
1613}
1614
034c6ed7
LP		 1615void exec_command_free_array(ExecCommand **c, unsigned n) {
1616 unsigned i;
1617
1618 for (i = 0; i < n; i++) {
1619 exec_command_free_list(c[i]);
1620 c[i] = NULL;
1621 }
1622}
1623
8c7be95e
LP		 1624int exec_context_load_environment(const ExecContext *c, char ***l) {
1625 char **i, **r = NULL;
1626
1627 assert(c);
1628 assert(l);
1629
1630 STRV_FOREACH(i, c->environment_files) {
1631 char *fn;
1632 int k;
1633 bool ignore = false;
1634 char **p;
2bef10ab
PL		 1635 glob_t pglob;
1636 int count, n;
8c7be95e
LP		 1637
1638 fn = *i;
1639
1640 if (fn[0] == '-') {
1641 ignore = true;
1642 fn ++;
1643 }
1644
1645 if (!path_is_absolute(fn)) {
1646
1647 if (ignore)
1648 continue;
1649
1650 strv_free(r);
1651 return -EINVAL;
1652 }
1653
2bef10ab
PL		 1654 /* Filename supports globbing, take all matching files */
1655 zero(pglob);
1656 errno = 0;
1657 if (glob(fn, 0, NULL, &pglob) != 0) {
1658 globfree(&pglob);
1659 if (ignore)
1660 continue;
8c7be95e 1661
2bef10ab
PL		 1662 strv_free(r);
1663 return errno ? -errno : -EINVAL;
1664 }
1665 count = pglob.gl_pathc;
1666 if (count == 0) {
1667 globfree(&pglob);
8c7be95e
LP		 1668 if (ignore)
1669 continue;
1670
1671 strv_free(r);
2bef10ab 1672 return -EINVAL;
8c7be95e 1673 }
2bef10ab
PL		 1674 for (n = 0; n < count; n++) {
1675 k = load_env_file(pglob.gl_pathv[n], &p);
1676 if (k < 0) {
1677 if (ignore)
1678 continue;
8c7be95e 1679
2bef10ab
PL		 1680 strv_free(r);
1681 globfree(&pglob);
1682 return k;
1683 }
8c7be95e 1684
2bef10ab
PL		 1685 if (r == NULL)
1686 r = p;
1687 else {
1688 char **m;
8c7be95e 1689
2bef10ab
PL		 1690 m = strv_env_merge(2, r, p);
1691 strv_free(r);
1692 strv_free(p);
8c7be95e 1693
2bef10ab
PL		 1694 if (!m) {
1695 globfree(&pglob);
1696 return -ENOMEM;
1697 }
1698
1699 r = m;
1700 }
8c7be95e 1701 }
2bef10ab 1702 globfree(&pglob);
8c7be95e
LP		 1703 }
1704
1705 *l = r;
1706
1707 return 0;
1708}
1709
15ae422b
LP		 1710static void strv_fprintf(FILE *f, char **l) {
1711 char **g;
1712
1713 assert(f);
1714
1715 STRV_FOREACH(g, l)
1716 fprintf(f, " %s", *g);
1717}
1718
5cb5a6ff 1719void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
94f04347
LP		 1720 char ** e;
1721 unsigned i;
9eba9da4 1722
5cb5a6ff
LP		 1723 assert(c);
1724 assert(f);
1725
1726 if (!prefix)
1727 prefix = "";
1728
1729 fprintf(f,
94f04347
LP		 1730 "%sUMask: %04o\n"
1731 "%sWorkingDirectory: %s\n"
451a074f 1732 "%sRootDirectory: %s\n"
15ae422b 1733 "%sNonBlocking: %s\n"
64747e2d 1734 "%sPrivateTmp: %s\n"
ff01d048 1735 "%sControlGroupModify: %s\n"
891703e1 1736 "%sControlGroupPersistent: %s\n"
4819ff03
LP		 1737 "%sPrivateNetwork: %s\n"
1738 "%sIgnoreSIGPIPE: %s\n",
5cb5a6ff 1739 prefix, c->umask,
9eba9da4 1740 prefix, c->working_directory ? c->working_directory : "/",
451a074f 1741 prefix, c->root_directory ? c->root_directory : "/",
15ae422b 1742 prefix, yes_no(c->non_blocking),
64747e2d 1743 prefix, yes_no(c->private_tmp),
ff01d048 1744 prefix, yes_no(c->control_group_modify),
891703e1 1745 prefix, yes_no(c->control_group_persistent),
4819ff03
LP		 1746 prefix, yes_no(c->private_network),
1747 prefix, yes_no(c->ignore_sigpipe));
fb33a393 1748
8c7be95e
LP		 1749 STRV_FOREACH(e, c->environment)
1750 fprintf(f, "%sEnvironment: %s\n", prefix, *e);
1751
1752 STRV_FOREACH(e, c->environment_files)
1753 fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e);
94f04347 1754
df1f0afe
LP		 1755 if (c->tcpwrap_name)
1756 fprintf(f,
1757 "%sTCPWrapName: %s\n",
1758 prefix, c->tcpwrap_name);
1759
fb33a393
LP		 1760 if (c->nice_set)
1761 fprintf(f,
1762 "%sNice: %i\n",
1763 prefix, c->nice);
1764
dd6c17b1 1765 if (c->oom_score_adjust_set)
fb33a393 1766 fprintf(f,
dd6c17b1
LP		 1767 "%sOOMScoreAdjust: %i\n",
1768 prefix, c->oom_score_adjust);
9eba9da4 1769
94f04347
LP		 1770 for (i = 0; i < RLIM_NLIMITS; i++)
1771 if (c->rlimit[i])
ea430986 1772 fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
94f04347 1773
f8b69d1d
MS		 1774 if (c->ioprio_set) {
1775 char *class_str;
1776 int r;
1777
1778 r = ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str);
1779 if (r < 0)
1780 class_str = NULL;
9eba9da4
LP		 1781 fprintf(f,
1782 "%sIOSchedulingClass: %s\n"
1783 "%sIOPriority: %i\n",
f8b69d1d 1784 prefix, strna(class_str),
9eba9da4 1785 prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
f8b69d1d
MS		 1786 free(class_str);
1787 }
94f04347 1788
f8b69d1d
MS		 1789 if (c->cpu_sched_set) {
1790 char *policy_str;
1791 int r;
1792
1793 r = sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str);
1794 if (r < 0)
1795 policy_str = NULL;
94f04347
LP		 1796 fprintf(f,
1797 "%sCPUSchedulingPolicy: %s\n"
38b48754
LP		 1798 "%sCPUSchedulingPriority: %i\n"
1799 "%sCPUSchedulingResetOnFork: %s\n",
f8b69d1d 1800 prefix, strna(policy_str),
38b48754
LP		 1801 prefix, c->cpu_sched_priority,
1802 prefix, yes_no(c->cpu_sched_reset_on_fork));
f8b69d1d 1803 free(policy_str);
b929bf04 1804 }
94f04347 1805
82c121a4 1806 if (c->cpuset) {
94f04347 1807 fprintf(f, "%sCPUAffinity:", prefix);
82c121a4
LP		 1808 for (i = 0; i < c->cpuset_ncpus; i++)
1809 if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset))
94f04347
LP		 1810 fprintf(f, " %i", i);
1811 fputs("\n", f);
1812 }
1813
d88a251b 1814 if (c->timer_slack_nsec != (nsec_t) -1)
f96096db 1815 fprintf(f, "%sTimerSlackNSec: %lu\n", prefix, (unsigned long)c->timer_slack_nsec);
94f04347
LP		 1816
1817 fprintf(f,
80876c20
LP		 1818 "%sStandardInput: %s\n"
1819 "%sStandardOutput: %s\n"
1820 "%sStandardError: %s\n",
1821 prefix, exec_input_to_string(c->std_input),
1822 prefix, exec_output_to_string(c->std_output),
1823 prefix, exec_output_to_string(c->std_error));
1824
1825 if (c->tty_path)
1826 fprintf(f,
6ea832a2
LP		 1827 "%sTTYPath: %s\n"
1828 "%sTTYReset: %s\n"
1829 "%sTTYVHangup: %s\n"
1830 "%sTTYVTDisallocate: %s\n",
1831 prefix, c->tty_path,
1832 prefix, yes_no(c->tty_reset),
1833 prefix, yes_no(c->tty_vhangup),
1834 prefix, yes_no(c->tty_vt_disallocate));
94f04347 1835
706343f4
LP		 1836 if (c->std_output == EXEC_OUTPUT_SYSLOG || c->std_output == EXEC_OUTPUT_KMSG || c->std_output == EXEC_OUTPUT_JOURNAL ||
1837 c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE || c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE ||
1838 c->std_error == EXEC_OUTPUT_SYSLOG || c->std_error == EXEC_OUTPUT_KMSG || c->std_error == EXEC_OUTPUT_JOURNAL ||
f8b69d1d
MS		 1839 c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE || c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) {
1840 char *fac_str, *lvl_str;
1841 int r;
1842
1843 r = log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str);
1844 if (r < 0)
1845 fac_str = NULL;
1846
1847 r = log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str);
1848 if (r < 0)
1849 lvl_str = NULL;
1850
94f04347
LP		 1851 fprintf(f,
1852 "%sSyslogFacility: %s\n"
1853 "%sSyslogLevel: %s\n",
f8b69d1d
MS		 1854 prefix, strna(fac_str),
1855 prefix, strna(lvl_str));
1856 free(lvl_str);
1857 free(fac_str);
1858 }
94f04347
LP		 1859
1860 if (c->capabilities) {
1861 char *t;
1862 if ((t = cap_to_text(c->capabilities, NULL))) {
1863 fprintf(f, "%sCapabilities: %s\n",
1864 prefix, t);
1865 cap_free(t);
1866 }
1867 }
1868
1869 if (c->secure_bits)
1870 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
1871 prefix,
1872 (c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "",
1873 (c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
1874 (c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
1875 (c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
1876 (c->secure_bits & SECURE_NOROOT) ? " noroot" : "",
1877 (c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
1878
1879 if (c->capability_bounding_set_drop) {
ae556c21 1880 unsigned long l;
260abb78 1881 fprintf(f, "%sCapabilityBoundingSet:", prefix);
94f04347 1882
64685e0c 1883 for (l = 0; l <= cap_last_cap(); l++)
ae556c21 1884 if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) {
94f04347
LP		 1885 char *t;
1886
ae556c21 1887 if ((t = cap_to_name(l))) {
94f04347 1888 fprintf(f, " %s", t);
260abb78 1889 cap_free(t);
94f04347
LP		 1890 }
1891 }
1892
1893 fputs("\n", f);
1894 }
1895
1896 if (c->user)
f2d3769a 1897 fprintf(f, "%sUser: %s\n", prefix, c->user);
94f04347 1898 if (c->group)
f2d3769a 1899 fprintf(f, "%sGroup: %s\n", prefix, c->group);
94f04347 1900
15ae422b 1901 if (strv_length(c->supplementary_groups) > 0) {
94f04347 1902 fprintf(f, "%sSupplementaryGroups:", prefix);
15ae422b
LP		 1903 strv_fprintf(f, c->supplementary_groups);
1904 fputs("\n", f);
1905 }
94f04347 1906
5b6319dc 1907 if (c->pam_name)
f2d3769a 1908 fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name);
5b6319dc 1909
15ae422b
LP		 1910 if (strv_length(c->read_write_dirs) > 0) {
1911 fprintf(f, "%sReadWriteDirs:", prefix);
1912 strv_fprintf(f, c->read_write_dirs);
1913 fputs("\n", f);
1914 }
1915
1916 if (strv_length(c->read_only_dirs) > 0) {
1917 fprintf(f, "%sReadOnlyDirs:", prefix);
1918 strv_fprintf(f, c->read_only_dirs);
1919 fputs("\n", f);
1920 }
94f04347 1921
15ae422b
LP		 1922 if (strv_length(c->inaccessible_dirs) > 0) {
1923 fprintf(f, "%sInaccessibleDirs:", prefix);
1924 strv_fprintf(f, c->inaccessible_dirs);
94f04347
LP		 1925 fputs("\n", f);
1926 }
2e22afe9 1927
169c1bda
LP		 1928 if (c->utmp_id)
1929 fprintf(f,
1930 "%sUtmpIdentifier: %s\n",
1931 prefix, c->utmp_id);
5cb5a6ff
LP		 1932}
1933
b58b4116 1934void exec_status_start(ExecStatus *s, pid_t pid) {
034c6ed7 1935 assert(s);
5cb5a6ff 1936
b58b4116
LP		 1937 zero(*s);
1938 s->pid = pid;
1939 dual_timestamp_get(&s->start_timestamp);
1940}
1941
6ea832a2 1942void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) {
b58b4116
LP		 1943 assert(s);
1944
0b1f4ae6 1945 if (s->pid && s->pid != pid)
b58b4116
LP		 1946 zero(*s);
1947
034c6ed7 1948 s->pid = pid;
63983207 1949 dual_timestamp_get(&s->exit_timestamp);
9fb86720 1950
034c6ed7
LP		 1951 s->code = code;
1952 s->status = status;
169c1bda 1953
6ea832a2
LP		 1954 if (context) {
1955 if (context->utmp_id)
1956 utmp_put_dead_process(context->utmp_id, pid, code, status);
1957
1958 exec_context_tty_reset(context);
1959 }
9fb86720
LP		 1960}
1961
1962void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
1963 char buf[FORMAT_TIMESTAMP_MAX];
1964
1965 assert(s);
1966 assert(f);
1967
1968 if (!prefix)
1969 prefix = "";
1970
1971 if (s->pid <= 0)
1972 return;
1973
1974 fprintf(f,
bb00e604
LP		 1975 "%sPID: %lu\n",
1976 prefix, (unsigned long) s->pid);
9fb86720 1977
63983207 1978 if (s->start_timestamp.realtime > 0)
9fb86720
LP		 1979 fprintf(f,
1980 "%sStart Timestamp: %s\n",
63983207 1981 prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime));
9fb86720 1982
63983207 1983 if (s->exit_timestamp.realtime > 0)
9fb86720
LP		 1984 fprintf(f,
1985 "%sExit Timestamp: %s\n"
1986 "%sExit Code: %s\n"
1987 "%sExit Status: %i\n",
63983207 1988 prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime),
9fb86720
LP		 1989 prefix, sigchld_code_to_string(s->code),
1990 prefix, s->status);
5cb5a6ff 1991}
44d8db9e 1992
9e2f7c11 1993char *exec_command_line(char **argv) {
44d8db9e
LP		 1994 size_t k;
1995 char *n, *p, **a;
1996 bool first = true;
1997
9e2f7c11 1998 assert(argv);
44d8db9e 1999
9164977d 2000 k = 1;
9e2f7c11 2001 STRV_FOREACH(a, argv)
44d8db9e
LP		 2002 k += strlen(*a)+3;
2003
2004 if (!(n = new(char, k)))
2005 return NULL;
2006
2007 p = n;
9e2f7c11 2008 STRV_FOREACH(a, argv) {
44d8db9e
LP		 2009
2010 if (!first)
2011 *(p++) = ' ';
2012 else
2013 first = false;
2014
2015 if (strpbrk(*a, WHITESPACE)) {
2016 *(p++) = '\'';
2017 p = stpcpy(p, *a);
2018 *(p++) = '\'';
2019 } else
2020 p = stpcpy(p, *a);
2021
2022 }
2023
9164977d
LP		 2024 *p = 0;
2025
44d8db9e
LP		 2026 /* FIXME: this doesn't really handle arguments that have
2027 * spaces and ticks in them */
2028
2029 return n;
2030}
2031
2032void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
9fb86720
LP		 2033 char *p2;
2034 const char *prefix2;
2035
44d8db9e
LP		 2036 char *cmd;
2037
2038 assert(c);
2039 assert(f);
2040
2041 if (!prefix)
2042 prefix = "";
9fb86720
LP		 2043 p2 = strappend(prefix, "\t");
2044 prefix2 = p2 ? p2 : prefix;
44d8db9e 2045
9e2f7c11 2046 cmd = exec_command_line(c->argv);
44d8db9e
LP		 2047
2048 fprintf(f,
2049 "%sCommand Line: %s\n",
2050 prefix, cmd ? cmd : strerror(ENOMEM));
2051
2052 free(cmd);
9fb86720
LP		 2053
2054 exec_status_dump(&c->exec_status, f, prefix2);
2055
2056 free(p2);
44d8db9e
LP		 2057}
2058
2059void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
2060 assert(f);
2061
2062 if (!prefix)
2063 prefix = "";
2064
2065 LIST_FOREACH(command, c, c)
2066 exec_command_dump(c, f, prefix);
2067}
94f04347 2068
a6a80b4f
LP		 2069void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
2070 ExecCommand *end;
2071
2072 assert(l);
2073 assert(e);
2074
2075 if (*l) {
35b8ca3a 2076 /* It's kind of important, that we keep the order here */
a6a80b4f
LP		 2077 LIST_FIND_TAIL(ExecCommand, command, *l, end);
2078 LIST_INSERT_AFTER(ExecCommand, command, *l, end, e);
2079 } else
2080 *l = e;
2081}
2082
26fd040d
LP		 2083int exec_command_set(ExecCommand *c, const char *path, ...) {
2084 va_list ap;
2085 char **l, *p;
2086
2087 assert(c);
2088 assert(path);
2089
2090 va_start(ap, path);
2091 l = strv_new_ap(path, ap);
2092 va_end(ap);
2093
2094 if (!l)
2095 return -ENOMEM;
2096
2097 if (!(p = strdup(path))) {
2098 strv_free(l);
2099 return -ENOMEM;
2100 }
2101
2102 free(c->path);
2103 c->path = p;
2104
2105 strv_free(c->argv);
2106 c->argv = l;
2107
2108 return 0;
2109}
2110
80876c20
LP		 2111static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
2112 [EXEC_INPUT_NULL] = "null",
2113 [EXEC_INPUT_TTY] = "tty",
2114 [EXEC_INPUT_TTY_FORCE] = "tty-force",
4f2d528d
LP		 2115 [EXEC_INPUT_TTY_FAIL] = "tty-fail",
2116 [EXEC_INPUT_SOCKET] = "socket"
80876c20
LP		 2117};
2118
8a0867d6
LP		 2119DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
2120
94f04347 2121static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
80876c20 2122 [EXEC_OUTPUT_INHERIT] = "inherit",
94f04347 2123 [EXEC_OUTPUT_NULL] = "null",
80876c20 2124 [EXEC_OUTPUT_TTY] = "tty",
94f04347 2125 [EXEC_OUTPUT_SYSLOG] = "syslog",
28dbc1e8 2126 [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console",
9a6bca7a 2127 [EXEC_OUTPUT_KMSG] = "kmsg",
28dbc1e8 2128 [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console",
706343f4
LP		 2129 [EXEC_OUTPUT_JOURNAL] = "journal",
2130 [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console",
4f2d528d 2131 [EXEC_OUTPUT_SOCKET] = "socket"
94f04347
LP		 2132};
2133
2134DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
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