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execute: invoke sigwait() in a loop when waiting for PAM parent, to avoid spurious...
[thirdparty/systemd.git] / src / execute.c
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d6c9574f 1/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
5cb5a6ff 2
a7334b09
LP		 3/***
4 This file is part of systemd.
5
6 Copyright 2010 Lennart Poettering
7
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20***/
21
5cb5a6ff 22#include <assert.h>
034c6ed7
LP		 23#include <dirent.h>
24#include <errno.h>
25#include <fcntl.h>
26#include <unistd.h>
44d8db9e 27#include <string.h>
309bff19 28#include <signal.h>
071830ff
LP		 29#include <sys/socket.h>
30#include <sys/un.h>
94f04347 31#include <sys/prctl.h>
66ee3769 32#include <linux/sched.h>
451a074f
LP		 33#include <sys/types.h>
34#include <sys/stat.h>
81a2b7ce
LP		 35#include <grp.h>
36#include <pwd.h>
15ae422b 37#include <sys/mount.h>
25e870b5 38#include <linux/fs.h>
dd6c17b1 39#include <linux/oom.h>
5cb5a6ff 40
5b6319dc
LP		 41#ifdef HAVE_PAM
42#include <security/pam_appl.h>
43#endif
44
5cb5a6ff
LP		 45#include "execute.h"
46#include "strv.h"
47#include "macro.h"
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"
5cb5a6ff 59
02a51aba
LP		 60/* This assumes there is a 'tty' group */
61#define TTY_MODE 0620
62
034c6ed7
LP		 63static int shift_fds(int fds[], unsigned n_fds) {
64 int start, restart_from;
65
66 if (n_fds <= 0)
67 return 0;
68
a0d40ac5
LP		 69 /* Modifies the fds array! (sorts it) */
70
034c6ed7
LP		 71 assert(fds);
72
73 start = 0;
74 for (;;) {
75 int i;
76
77 restart_from = -1;
78
79 for (i = start; i < (int) n_fds; i++) {
80 int nfd;
81
82 /* Already at right index? */
83 if (fds[i] == i+3)
84 continue;
85
86 if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
87 return -errno;
88
e1f5e051 89 close_nointr_nofail(fds[i]);
034c6ed7
LP		 90 fds[i] = nfd;
91
92 /* Hmm, the fd we wanted isn't free? Then
93 * let's remember that and try again from here*/
94 if (nfd != i+3 && restart_from < 0)
95 restart_from = i;
96 }
97
98 if (restart_from < 0)
99 break;
100
101 start = restart_from;
102 }
103
104 return 0;
105}
106
c2748801 107static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) {
47a71eed 108 unsigned i;
e2c76839 109 int r;
47a71eed
LP		 110
111 if (n_fds <= 0)
112 return 0;
113
114 assert(fds);
115
451a074f 116 /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
47a71eed
LP		 117
118 for (i = 0; i < n_fds; i++) {
47a71eed 119
e2c76839
LP		 120 if ((r = fd_nonblock(fds[i], nonblock)) < 0)
121 return r;
47a71eed 122
451a074f
LP		 123 /* We unconditionally drop FD_CLOEXEC from the fds,
124 * since after all we want to pass these fds to our
125 * children */
47a71eed 126
e2c76839
LP		 127 if ((r = fd_cloexec(fds[i], false)) < 0)
128 return r;
47a71eed
LP		 129 }
130
131 return 0;
132}
133
80876c20
LP		 134static const char *tty_path(const ExecContext *context) {
135 assert(context);
136
137 if (context->tty_path)
138 return context->tty_path;
139
140 return "/dev/console";
141}
142
6ea832a2
LP		 143void exec_context_tty_reset(const ExecContext *context) {
144 assert(context);
145
146 if (context->tty_vhangup)
147 terminal_vhangup(tty_path(context));
148
149 if (context->tty_reset)
150 reset_terminal(tty_path(context));
151
152 if (context->tty_vt_disallocate && context->tty_path)
153 vt_disallocate(context->tty_path);
154}
155
80876c20
LP		 156static int open_null_as(int flags, int nfd) {
157 int fd, r;
071830ff 158
80876c20 159 assert(nfd >= 0);
071830ff 160
80876c20 161 if ((fd = open("/dev/null", flags|O_NOCTTY)) < 0)
071830ff
LP		 162 return -errno;
163
80876c20
LP		 164 if (fd != nfd) {
165 r = dup2(fd, nfd) < 0 ? -errno : nfd;
e1f5e051 166 close_nointr_nofail(fd);
80876c20
LP		 167 } else
168 r = nfd;
071830ff 169
80876c20 170 return r;
071830ff
LP		 171}
172
80876c20
LP		 173static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, int nfd) {
174 int fd, r;
175 union {
176 struct sockaddr sa;
177 struct sockaddr_un un;
178 } sa;
071830ff
LP		 179
180 assert(context);
80876c20
LP		 181 assert(output < _EXEC_OUTPUT_MAX);
182 assert(ident);
183 assert(nfd >= 0);
071830ff 184
80876c20
LP		 185 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
186 return -errno;
071830ff 187
80876c20
LP		 188 zero(sa);
189 sa.sa.sa_family = AF_UNIX;
91b22f21 190 strncpy(sa.un.sun_path, LOGGER_SOCKET, sizeof(sa.un.sun_path));
071830ff 191
91b22f21 192 if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + sizeof(LOGGER_SOCKET) - 1) < 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 /* We speak a very simple protocol between log server
203 * and client: one line for the log destination (kmsg
204 * or syslog), followed by the priority field,
205 * followed by the process name. Since we replaced
206 * stdin/stderr we simple use stdio to write to
207 * it. Note that we use stderr, to minimize buffer
208 * flushing issues. */
209
210 dprintf(fd,
211 "%s\n"
212 "%i\n"
4f4a1dbf
LP		 213 "%s\n"
214 "%i\n",
28dbc1e8
LP		 215 output == EXEC_OUTPUT_KMSG ? "kmsg" :
216 output == EXEC_OUTPUT_KMSG_AND_CONSOLE ? "kmsg+console" :
217 output == EXEC_OUTPUT_SYSLOG ? "syslog" :
218 "syslog+console",
80876c20 219 context->syslog_priority,
4f4a1dbf 220 context->syslog_identifier ? context->syslog_identifier : ident,
74922904 221 context->syslog_level_prefix);
80876c20
LP		 222
223 if (fd != nfd) {
224 r = dup2(fd, nfd) < 0 ? -errno : nfd;
e1f5e051 225 close_nointr_nofail(fd);
80876c20
LP		 226 } else
227 r = nfd;
071830ff 228
80876c20
LP		 229 return r;
230}
231static int open_terminal_as(const char *path, mode_t mode, int nfd) {
232 int fd, r;
071830ff 233
80876c20
LP		 234 assert(path);
235 assert(nfd >= 0);
071830ff 236
80876c20
LP		 237 if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
238 return fd;
071830ff 239
80876c20
LP		 240 if (fd != nfd) {
241 r = dup2(fd, nfd) < 0 ? -errno : nfd;
242 close_nointr_nofail(fd);
243 } else
244 r = nfd;
071830ff 245
80876c20
LP		 246 return r;
247}
071830ff 248
80876c20
LP		 249static bool is_terminal_input(ExecInput i) {
250 return
251 i == EXEC_INPUT_TTY ||
252 i == EXEC_INPUT_TTY_FORCE ||
253 i == EXEC_INPUT_TTY_FAIL;
254}
071830ff 255
1e3ad081
LP		 256static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) {
257
258 if (is_terminal_input(std_input) && !apply_tty_stdin)
259 return EXEC_INPUT_NULL;
071830ff 260
03fd9c49 261 if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 262 return EXEC_INPUT_NULL;
263
03fd9c49 264 return std_input;
4f2d528d
LP		 265}
266
03fd9c49 267static int fixup_output(ExecOutput std_output, int socket_fd) {
4f2d528d 268
03fd9c49 269 if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 270 return EXEC_OUTPUT_INHERIT;
271
03fd9c49 272 return std_output;
4f2d528d
LP		 273}
274
1e3ad081 275static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) {
4f2d528d
LP		 276 ExecInput i;
277
278 assert(context);
279
1e3ad081 280 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
4f2d528d
LP		 281
282 switch (i) {
071830ff 283
80876c20
LP		 284 case EXEC_INPUT_NULL:
285 return open_null_as(O_RDONLY, STDIN_FILENO);
286
287 case EXEC_INPUT_TTY:
288 case EXEC_INPUT_TTY_FORCE:
289 case EXEC_INPUT_TTY_FAIL: {
290 int fd, r;
071830ff 291
80876c20
LP		 292 if ((fd = acquire_terminal(
293 tty_path(context),
4f2d528d 294 i == EXEC_INPUT_TTY_FAIL,
21de3988
LP		 295 i == EXEC_INPUT_TTY_FORCE,
296 false)) < 0)
80876c20
LP		 297 return fd;
298
299 if (fd != STDIN_FILENO) {
300 r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
071830ff 301 close_nointr_nofail(fd);
80876c20
LP		 302 } else
303 r = STDIN_FILENO;
304
305 return r;
306 }
307
4f2d528d
LP		 308 case EXEC_INPUT_SOCKET:
309 return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
310
80876c20
LP		 311 default:
312 assert_not_reached("Unknown input type");
313 }
314}
315
1e3ad081 316static int setup_output(const ExecContext *context, int socket_fd, const char *ident, bool apply_tty_stdin) {
4f2d528d
LP		 317 ExecOutput o;
318 ExecInput i;
319
80876c20
LP		 320 assert(context);
321 assert(ident);
322
1e3ad081 323 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
03fd9c49 324 o = fixup_output(context->std_output, socket_fd);
4f2d528d 325
80876c20
LP		 326 /* This expects the input is already set up */
327
4f2d528d 328 switch (o) {
071830ff 329
80876c20
LP		 330 case EXEC_OUTPUT_INHERIT:
331
21d21ea4
LP		 332 /* If input got downgraded, inherit the original value */
333 if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input))
334 return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
335
acb591e4 336 /* If the input is connected to anything that's not a /dev/null, inherit that... */
ff876e28 337 if (i != EXEC_INPUT_NULL)
80876c20 338 return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
071830ff 339
acb591e4
LP		 340 /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */
341 if (getppid() != 1)
342 return STDOUT_FILENO;
ff876e28 343
acb591e4
LP		 344 /* We need to open /dev/null here anew, to get the
345 * right access mode. So we fall through */
80876c20
LP		 346
347 case EXEC_OUTPUT_NULL:
348 return open_null_as(O_WRONLY, STDOUT_FILENO);
349
4f2d528d
LP		 350 case EXEC_OUTPUT_TTY:
351 if (is_terminal_input(i))
80876c20
LP		 352 return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
353
354 /* We don't reset the terminal if this is just about output */
355 return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
94f04347 356
80876c20 357 case EXEC_OUTPUT_SYSLOG:
28dbc1e8 358 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
9a6bca7a 359 case EXEC_OUTPUT_KMSG:
28dbc1e8 360 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
4f2d528d
LP		 361 return connect_logger_as(context, o, ident, STDOUT_FILENO);
362
363 case EXEC_OUTPUT_SOCKET:
364 assert(socket_fd >= 0);
365 return dup2(socket_fd, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
80876c20 366
94f04347
LP		 367 default:
368 assert_not_reached("Unknown output type");
071830ff 369 }
94f04347
LP		 370}
371
1e3ad081 372static int setup_error(const ExecContext *context, int socket_fd, const char *ident, bool apply_tty_stdin) {
4f2d528d
LP		 373 ExecOutput o, e;
374 ExecInput i;
375
94f04347 376 assert(context);
02a51aba 377 assert(ident);
071830ff 378
1e3ad081 379 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
03fd9c49
LP		 380 o = fixup_output(context->std_output, socket_fd);
381 e = fixup_output(context->std_error, socket_fd);
4f2d528d 382
80876c20 383 /* This expects the input and output are already set up */
94f04347 384
80876c20
LP		 385 /* Don't change the stderr file descriptor if we inherit all
386 * the way and are not on a tty */
4f2d528d
LP		 387 if (e == EXEC_OUTPUT_INHERIT &&
388 o == EXEC_OUTPUT_INHERIT &&
acb591e4 389 i == EXEC_INPUT_NULL &&
21d21ea4 390 !is_terminal_input(context->std_input) &&
dec5d552 391 getppid () != 1)
80876c20 392 return STDERR_FILENO;
94f04347 393
21d21ea4 394 /* Duplicate from stdout if possible */
4f2d528d 395 if (e == o || e == EXEC_OUTPUT_INHERIT)
80876c20 396 return dup2(STDOUT_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
94f04347 397
4f2d528d 398 switch (e) {
80876c20
LP		 399
400 case EXEC_OUTPUT_NULL:
401 return open_null_as(O_WRONLY, STDERR_FILENO);
402
403 case EXEC_OUTPUT_TTY:
4f2d528d 404 if (is_terminal_input(i))
80876c20
LP		 405 return dup2(STDIN_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
406
407 /* We don't reset the terminal if this is just about output */
408 return open_terminal_as(tty_path(context), O_WRONLY, STDERR_FILENO);
409
410 case EXEC_OUTPUT_SYSLOG:
28dbc1e8 411 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
9a6bca7a 412 case EXEC_OUTPUT_KMSG:
28dbc1e8 413 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
4f2d528d
LP		 414 return connect_logger_as(context, e, ident, STDERR_FILENO);
415
416 case EXEC_OUTPUT_SOCKET:
417 assert(socket_fd >= 0);
418 return dup2(socket_fd, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
94f04347
LP		 419
420 default:
80876c20 421 assert_not_reached("Unknown error type");
94f04347 422 }
071830ff
LP		 423}
424
02a51aba
LP		 425static int chown_terminal(int fd, uid_t uid) {
426 struct stat st;
427
428 assert(fd >= 0);
02a51aba
LP		 429
430 /* This might fail. What matters are the results. */
bab45044
LP		 431 (void) fchown(fd, uid, -1);
432 (void) fchmod(fd, TTY_MODE);
02a51aba
LP		 433
434 if (fstat(fd, &st) < 0)
435 return -errno;
436
d8b4e2e9 437 if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
02a51aba
LP		 438 return -EPERM;
439
440 return 0;
441}
442
80876c20
LP		 443static int setup_confirm_stdio(const ExecContext *context,
444 int *_saved_stdin,
445 int *_saved_stdout) {
446 int fd = -1, saved_stdin, saved_stdout = -1, r;
447
448 assert(context);
449 assert(_saved_stdin);
450 assert(_saved_stdout);
451
452 /* This returns positive EXIT_xxx return values instead of
453 * negative errno style values! */
454
455 if ((saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3)) < 0)
456 return EXIT_STDIN;
457
458 if ((saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3)) < 0) {
459 r = EXIT_STDOUT;
460 goto fail;
461 }
462
463 if ((fd = acquire_terminal(
464 tty_path(context),
465 context->std_input == EXEC_INPUT_TTY_FAIL,
21de3988
LP		 466 context->std_input == EXEC_INPUT_TTY_FORCE,
467 false)) < 0) {
80876c20
LP		 468 r = EXIT_STDIN;
469 goto fail;
470 }
471
02a51aba
LP		 472 if (chown_terminal(fd, getuid()) < 0) {
473 r = EXIT_STDIN;
474 goto fail;
475 }
476
80876c20
LP		 477 if (dup2(fd, STDIN_FILENO) < 0) {
478 r = EXIT_STDIN;
479 goto fail;
480 }
481
482 if (dup2(fd, STDOUT_FILENO) < 0) {
483 r = EXIT_STDOUT;
484 goto fail;
485 }
486
487 if (fd >= 2)
488 close_nointr_nofail(fd);
489
490 *_saved_stdin = saved_stdin;
491 *_saved_stdout = saved_stdout;
492
493 return 0;
494
495fail:
496 if (saved_stdout >= 0)
497 close_nointr_nofail(saved_stdout);
498
499 if (saved_stdin >= 0)
500 close_nointr_nofail(saved_stdin);
501
502 if (fd >= 0)
503 close_nointr_nofail(fd);
504
505 return r;
506}
507
2608882f 508static int restore_confirm_stdio(const ExecContext *context,
80876c20
LP		 509 int *saved_stdin,
510 int *saved_stdout,
511 bool *keep_stdin,
512 bool *keep_stdout) {
513
514 assert(context);
515 assert(saved_stdin);
516 assert(*saved_stdin >= 0);
517 assert(saved_stdout);
518 assert(*saved_stdout >= 0);
519
520 /* This returns positive EXIT_xxx return values instead of
521 * negative errno style values! */
522
523 if (is_terminal_input(context->std_input)) {
524
525 /* The service wants terminal input. */
526
527 *keep_stdin = true;
528 *keep_stdout =
529 context->std_output == EXEC_OUTPUT_INHERIT ||
530 context->std_output == EXEC_OUTPUT_TTY;
531
532 } else {
533 /* If the service doesn't want a controlling terminal,
534 * then we need to get rid entirely of what we have
535 * already. */
536
537 if (release_terminal() < 0)
538 return EXIT_STDIN;
539
540 if (dup2(*saved_stdin, STDIN_FILENO) < 0)
541 return EXIT_STDIN;
542
543 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
544 return EXIT_STDOUT;
545
546 *keep_stdout = *keep_stdin = false;
547 }
548
549 return 0;
550}
551
81a2b7ce
LP		 552static int get_group_creds(const char *groupname, gid_t *gid) {
553 struct group *g;
554 unsigned long lu;
555
556 assert(groupname);
557 assert(gid);
558
559 /* We enforce some special rules for gid=0: in order to avoid
560 * NSS lookups for root we hardcode its data. */
561
562 if (streq(groupname, "root") || streq(groupname, "0")) {
563 *gid = 0;
564 return 0;
565 }
566
567 if (safe_atolu(groupname, &lu) >= 0) {
568 errno = 0;
569 g = getgrgid((gid_t) lu);
570 } else {
571 errno = 0;
572 g = getgrnam(groupname);
573 }
574
575 if (!g)
576 return errno != 0 ? -errno : -ESRCH;
577
578 *gid = g->gr_gid;
579 return 0;
580}
581
582static int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) {
583 struct passwd *p;
584 unsigned long lu;
585
586 assert(username);
587 assert(*username);
588 assert(uid);
589 assert(gid);
590 assert(home);
591
592 /* We enforce some special rules for uid=0: in order to avoid
593 * NSS lookups for root we hardcode its data. */
594
595 if (streq(*username, "root") || streq(*username, "0")) {
596 *username = "root";
597 *uid = 0;
598 *gid = 0;
599 *home = "/root";
600 return 0;
601 }
602
603 if (safe_atolu(*username, &lu) >= 0) {
604 errno = 0;
605 p = getpwuid((uid_t) lu);
606
607 /* If there are multiple users with the same id, make
608 * sure to leave $USER to the configured value instead
35b8ca3a 609 * of the first occurrence in the database. However if
81a2b7ce
LP		 610 * the uid was configured by a numeric uid, then let's
611 * pick the real username from /etc/passwd. */
612 if (*username && p)
613 *username = p->pw_name;
614 } else {
615 errno = 0;
616 p = getpwnam(*username);
617 }
618
619 if (!p)
620 return errno != 0 ? -errno : -ESRCH;
621
622 *uid = p->pw_uid;
623 *gid = p->pw_gid;
624 *home = p->pw_dir;
625 return 0;
626}
627
628static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
629 bool keep_groups = false;
630 int r;
631
632 assert(context);
633
35b8ca3a 634 /* Lookup and set GID and supplementary group list. Here too
81a2b7ce
LP		 635 * we avoid NSS lookups for gid=0. */
636
637 if (context->group || username) {
638
639 if (context->group)
640 if ((r = get_group_creds(context->group, &gid)) < 0)
641 return r;
642
643 /* First step, initialize groups from /etc/groups */
644 if (username && gid != 0) {
645 if (initgroups(username, gid) < 0)
646 return -errno;
647
648 keep_groups = true;
649 }
650
651 /* Second step, set our gids */
652 if (setresgid(gid, gid, gid) < 0)
653 return -errno;
654 }
655
656 if (context->supplementary_groups) {
657 int ngroups_max, k;
658 gid_t *gids;
659 char **i;
660
661 /* Final step, initialize any manually set supplementary groups */
da19d5c1 662 assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0);
81a2b7ce
LP		 663
664 if (!(gids = new(gid_t, ngroups_max)))
665 return -ENOMEM;
666
667 if (keep_groups) {
668 if ((k = getgroups(ngroups_max, gids)) < 0) {
669 free(gids);
670 return -errno;
671 }
672 } else
673 k = 0;
674
675 STRV_FOREACH(i, context->supplementary_groups) {
676
677 if (k >= ngroups_max) {
678 free(gids);
679 return -E2BIG;
680 }
681
682 if ((r = get_group_creds(*i, gids+k)) < 0) {
683 free(gids);
684 return r;
685 }
686
687 k++;
688 }
689
690 if (setgroups(k, gids) < 0) {
691 free(gids);
692 return -errno;
693 }
694
695 free(gids);
696 }
697
698 return 0;
699}
700
701static int enforce_user(const ExecContext *context, uid_t uid) {
702 int r;
703 assert(context);
704
705 /* Sets (but doesn't lookup) the uid and make sure we keep the
706 * capabilities while doing so. */
707
708 if (context->capabilities) {
709 cap_t d;
710 static const cap_value_t bits[] = {
711 CAP_SETUID, /* Necessary so that we can run setresuid() below */
712 CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */
713 };
714
715 /* First step: If we need to keep capabilities but
716 * drop privileges we need to make sure we keep our
35b8ca3a 717 * caps, whiel we drop privileges. */
693ced48
LP		 718 if (uid != 0) {
719 int sb = context->secure_bits|SECURE_KEEP_CAPS;
720
721 if (prctl(PR_GET_SECUREBITS) != sb)
722 if (prctl(PR_SET_SECUREBITS, sb) < 0)
723 return -errno;
724 }
81a2b7ce 725
35b8ca3a 726 /* Second step: set the capabilities. This will reduce
81a2b7ce
LP		 727 * the capabilities to the minimum we need. */
728
729 if (!(d = cap_dup(context->capabilities)))
730 return -errno;
731
732 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
733 cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) {
734 r = -errno;
735 cap_free(d);
736 return r;
737 }
738
739 if (cap_set_proc(d) < 0) {
740 r = -errno;
741 cap_free(d);
742 return r;
743 }
744
745 cap_free(d);
746 }
747
748 /* Third step: actually set the uids */
749 if (setresuid(uid, uid, uid) < 0)
750 return -errno;
751
752 /* At this point we should have all necessary capabilities but
753 are otherwise a normal user. However, the caps might got
754 corrupted due to the setresuid() so we need clean them up
755 later. This is done outside of this call. */
756
757 return 0;
758}
759
5b6319dc
LP		 760#ifdef HAVE_PAM
761
762static int null_conv(
763 int num_msg,
764 const struct pam_message **msg,
765 struct pam_response **resp,
766 void *appdata_ptr) {
767
768 /* We don't support conversations */
769
770 return PAM_CONV_ERR;
771}
772
773static int setup_pam(
774 const char *name,
775 const char *user,
776 const char *tty,
777 char ***pam_env,
778 int fds[], unsigned n_fds) {
779
780 static const struct pam_conv conv = {
781 .conv = null_conv,
782 .appdata_ptr = NULL
783 };
784
785 pam_handle_t *handle = NULL;
786 sigset_t ss, old_ss;
787 int pam_code = PAM_SUCCESS;
788 char **e = NULL;
789 bool close_session = false;
790 pid_t pam_pid = 0, parent_pid;
791
792 assert(name);
793 assert(user);
794 assert(pam_env);
795
796 /* We set up PAM in the parent process, then fork. The child
35b8ca3a 797 * will then stay around until killed via PR_GET_PDEATHSIG or
5b6319dc
LP		 798 * systemd via the cgroup logic. It will then remove the PAM
799 * session again. The parent process will exec() the actual
800 * daemon. We do things this way to ensure that the main PID
801 * of the daemon is the one we initially fork()ed. */
802
803 if ((pam_code = pam_start(name, user, &conv, &handle)) != PAM_SUCCESS) {
804 handle = NULL;
805 goto fail;
806 }
807
808 if (tty)
809 if ((pam_code = pam_set_item(handle, PAM_TTY, tty)) != PAM_SUCCESS)
810 goto fail;
811
812 if ((pam_code = pam_acct_mgmt(handle, PAM_SILENT)) != PAM_SUCCESS)
813 goto fail;
814
815 if ((pam_code = pam_open_session(handle, PAM_SILENT)) != PAM_SUCCESS)
816 goto fail;
817
818 close_session = true;
819
5b6319dc
LP		 820 if ((!(e = pam_getenvlist(handle)))) {
821 pam_code = PAM_BUF_ERR;
822 goto fail;
823 }
824
825 /* Block SIGTERM, so that we know that it won't get lost in
826 * the child */
827 if (sigemptyset(&ss) < 0 ||
828 sigaddset(&ss, SIGTERM) < 0 ||
829 sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0)
830 goto fail;
831
832 parent_pid = getpid();
833
834 if ((pam_pid = fork()) < 0)
835 goto fail;
836
837 if (pam_pid == 0) {
838 int sig;
839 int r = EXIT_PAM;
840
841 /* The child's job is to reset the PAM session on
842 * termination */
843
844 /* This string must fit in 10 chars (i.e. the length
845 * of "/sbin/init") */
3dead8d9 846 rename_process("sd(PAM)");
5b6319dc
LP		 847
848 /* Make sure we don't keep open the passed fds in this
849 child. We assume that otherwise only those fds are
850 open here that have been opened by PAM. */
851 close_many(fds, n_fds);
852
853 /* Wait until our parent died. This will most likely
854 * not work since the kernel does not allow
35b8ca3a 855 * unprivileged parents kill their privileged children
5b6319dc
LP		 856 * this way. We rely on the control groups kill logic
857 * to do the rest for us. */
858 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
859 goto child_finish;
860
861 /* Check if our parent process might already have
862 * died? */
863 if (getppid() == parent_pid) {
3dead8d9
LP		 864 for (;;) {
865 if (sigwait(&ss, &sig) < 0) {
866 if (errno == EINTR)
867 continue;
868
869 goto child_finish;
870 }
5b6319dc 871
3dead8d9
LP		 872 assert(sig == SIGTERM);
873 break;
874 }
5b6319dc
LP		 875 }
876
3dead8d9 877 /* If our parent died we'll end the session */
5b6319dc
LP		 878 if (getppid() != parent_pid)
879 if ((pam_code = pam_close_session(handle, PAM_DATA_SILENT)) != PAM_SUCCESS)
880 goto child_finish;
881
882 r = 0;
883
884 child_finish:
885 pam_end(handle, pam_code | PAM_DATA_SILENT);
886 _exit(r);
887 }
888
889 /* If the child was forked off successfully it will do all the
890 * cleanups, so forget about the handle here. */
891 handle = NULL;
892
3b8bddde 893 /* Unblock SIGTERM again in the parent */
5b6319dc
LP		 894 if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0)
895 goto fail;
896
897 /* We close the log explicitly here, since the PAM modules
898 * might have opened it, but we don't want this fd around. */
899 closelog();
900
901 return 0;
902
903fail:
904 if (handle) {
905 if (close_session)
906 pam_code = pam_close_session(handle, PAM_DATA_SILENT);
907
908 pam_end(handle, pam_code | PAM_DATA_SILENT);
909 }
910
911 strv_free(e);
912
913 closelog();
914
430c18ed 915 if (pam_pid > 1) {
5b6319dc 916 kill(pam_pid, SIGTERM);
430c18ed
LP		 917 kill(pam_pid, SIGCONT);
918 }
5b6319dc
LP		 919
920 return EXIT_PAM;
921}
922#endif
923
73090dc8
LP		 924static int do_capability_bounding_set_drop(uint64_t drop) {
925 unsigned long i;
926 cap_t old_cap = NULL, new_cap = NULL;
927 cap_flag_value_t fv;
928 int r;
929
930 /* If we are run as PID 1 we will lack CAP_SETPCAP by default
931 * in the effective set (yes, the kernel drops that when
932 * executing init!), so get it back temporarily so that we can
933 * call PR_CAPBSET_DROP. */
934
935 old_cap = cap_get_proc();
936 if (!old_cap)
937 return -errno;
938
939 if (cap_get_flag(old_cap, CAP_SETPCAP, CAP_EFFECTIVE, &fv) < 0) {
940 r = -errno;
941 goto finish;
942 }
943
944 if (fv != CAP_SET) {
945 static const cap_value_t v = CAP_SETPCAP;
946
947 new_cap = cap_dup(old_cap);
948 if (!new_cap) {
949 r = -errno;
950 goto finish;
951 }
952
953 if (cap_set_flag(new_cap, CAP_EFFECTIVE, 1, &v, CAP_SET) < 0) {
954 r = -errno;
955 goto finish;
956 }
957
958 if (cap_set_proc(new_cap) < 0) {
959 r = -errno;
960 goto finish;
961 }
962 }
963
ae556c21 964 for (i = 0; i <= MAX(63LU, (unsigned long) CAP_LAST_CAP); i++)
73090dc8
LP		 965 if (drop & ((uint64_t) 1ULL << (uint64_t) i)) {
966 if (prctl(PR_CAPBSET_DROP, i) < 0) {
ae556c21
LP		 967 if (errno == EINVAL)
968 break;
969
73090dc8
LP		 970 r = -errno;
971 goto finish;
972 }
973 }
974
975 r = 0;
976
977finish:
978 if (new_cap)
979 cap_free(new_cap);
980
981 if (old_cap) {
982 cap_set_proc(old_cap);
983 cap_free(old_cap);
984 }
985
986 return r;
987}
988
9fb86720 989int exec_spawn(ExecCommand *command,
9e2f7c11 990 char **argv,
81a2b7ce 991 const ExecContext *context,
c2748801 992 int fds[], unsigned n_fds,
1137a57c 993 char **environment,
81a2b7ce
LP		 994 bool apply_permissions,
995 bool apply_chroot,
1e3ad081 996 bool apply_tty_stdin,
80876c20 997 bool confirm_spawn,
8e274523 998 CGroupBonding *cgroup_bondings,
81a2b7ce
LP		 999 pid_t *ret) {
1000
034c6ed7 1001 pid_t pid;
8e274523 1002 int r;
1a63a750 1003 char *line;
4f2d528d 1004 int socket_fd;
8c7be95e 1005 char **files_env = NULL;
034c6ed7 1006
5cb5a6ff
LP		 1007 assert(command);
1008 assert(context);
1009 assert(ret);
034c6ed7
LP		 1010 assert(fds || n_fds <= 0);
1011
4f2d528d
LP		 1012 if (context->std_input == EXEC_INPUT_SOCKET ||
1013 context->std_output == EXEC_OUTPUT_SOCKET ||
1014 context->std_error == EXEC_OUTPUT_SOCKET) {
1015
1016 if (n_fds != 1)
1017 return -EINVAL;
1018
1019 socket_fd = fds[0];
1020
1021 fds = NULL;
1022 n_fds = 0;
1023 } else
1024 socket_fd = -1;
1025
8c7be95e
LP		 1026 if ((r = exec_context_load_environment(context, &files_env)) < 0) {
1027 log_error("Failed to load environment files: %s", strerror(-r));
1028 return r;
1029 }
1030
9e2f7c11
LP		 1031 if (!argv)
1032 argv = command->argv;
1033
8c7be95e
LP		 1034 if (!(line = exec_command_line(argv))) {
1035 r = -ENOMEM;
1036 goto fail_parent;
1037 }
1a63a750
LP		 1038
1039 log_debug("About to execute: %s", line);
1040 free(line);
acbb0225 1041
8e274523
LP		 1042 if (cgroup_bondings)
1043 if ((r = cgroup_bonding_realize_list(cgroup_bondings)))
8c7be95e 1044 goto fail_parent;
8e274523 1045
8c7be95e
LP		 1046 if ((pid = fork()) < 0) {
1047 r = -errno;
1048 goto fail_parent;
1049 }
034c6ed7
LP		 1050
1051 if (pid == 0) {
8e274523 1052 int i;
309bff19 1053 sigset_t ss;
81a2b7ce
LP		 1054 const char *username = NULL, *home = NULL;
1055 uid_t uid = (uid_t) -1;
1056 gid_t gid = (gid_t) -1;
fab56fc5 1057 char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
81a2b7ce 1058 unsigned n_env = 0;
80876c20
LP		 1059 int saved_stdout = -1, saved_stdin = -1;
1060 bool keep_stdout = false, keep_stdin = false;
309bff19 1061
034c6ed7 1062 /* child */
5cb5a6ff 1063
5b6319dc
LP		 1064 /* This string must fit in 10 chars (i.e. the length
1065 * of "/sbin/init") */
9c1b183c 1066 rename_process("sd.exec");
5b6319dc 1067
1b91d3e8
LP		 1068 /* We reset exactly these signals, since they are the
1069 * only ones we set to SIG_IGN in the main daemon. All
1070 * others we leave untouched because we set them to
1071 * SIG_DFL or a valid handler initially, both of which
1072 * will be demoted to SIG_DFL. */
1073 default_signals(SIGNALS_CRASH_HANDLER,
9a34ec5f 1074 SIGNALS_IGNORE, -1);
7b683879 1075
309bff19
LP		 1076 if (sigemptyset(&ss) < 0 ||
1077 sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
1078 r = EXIT_SIGNAL_MASK;
8c7be95e 1079 goto fail_child;
309bff19
LP		 1080 }
1081
85d73053
LP		 1082 /* Close sockets very early to make sure we don't
1083 * block init reexecution because it cannot bind its
1084 * sockets */
73883adc
LP		 1085 if (close_all_fds(socket_fd >= 0 ? &socket_fd : fds,
1086 socket_fd >= 0 ? 1 : n_fds) < 0) {
fc9b2a84 1087 r = EXIT_FDS;
8c7be95e 1088 goto fail_child;
fc9b2a84
LP		 1089 }
1090
74922904 1091 if (!context->same_pgrp)
8d567588
LP		 1092 if (setsid() < 0) {
1093 r = EXIT_SETSID;
8c7be95e 1094 goto fail_child;
8d567588 1095 }
80876c20 1096
c5da34ef
LP		 1097 if (context->tcpwrap_name) {
1098 if (socket_fd >= 0)
1099 if (!socket_tcpwrap(socket_fd, context->tcpwrap_name)) {
1100 r = EXIT_TCPWRAP;
8c7be95e 1101 goto fail_child;
c5da34ef
LP		 1102 }
1103
1104 for (i = 0; i < (int) n_fds; i++) {
1105 if (!socket_tcpwrap(fds[i], context->tcpwrap_name)) {
1106 r = EXIT_TCPWRAP;
8c7be95e 1107 goto fail_child;
c5da34ef 1108 }
df1f0afe 1109 }
c5da34ef 1110 }
df1f0afe 1111
6ea832a2
LP		 1112 exec_context_tty_reset(context);
1113
1e3ad081
LP		 1114 /* We skip the confirmation step if we shall not apply the TTY */
1115 if (confirm_spawn &&
1116 (!is_terminal_input(context->std_input) || apply_tty_stdin)) {
80876c20
LP		 1117 char response;
1118
1119 /* Set up terminal for the question */
1120 if ((r = setup_confirm_stdio(context,
1121 &saved_stdin, &saved_stdout)))
8c7be95e 1122 goto fail_child;
80876c20
LP		 1123
1124 /* Now ask the question. */
9e2f7c11 1125 if (!(line = exec_command_line(argv))) {
80876c20 1126 r = EXIT_MEMORY;
8c7be95e 1127 goto fail_child;
ee2b4894 1128 }
80876c20
LP		 1129
1130 r = ask(&response, "yns", "Execute %s? [Yes, No, Skip] ", line);
1131 free(line);
1132
1133 if (r < 0 || response == 'n') {
1134 r = EXIT_CONFIRM;
8c7be95e 1135 goto fail_child;
80876c20
LP		 1136 } else if (response == 's') {
1137 r = 0;
8c7be95e 1138 goto fail_child;
ee2b4894 1139 }
80876c20
LP		 1140
1141 /* Release terminal for the question */
2608882f 1142 if ((r = restore_confirm_stdio(context,
80876c20
LP		 1143 &saved_stdin, &saved_stdout,
1144 &keep_stdin, &keep_stdout)))
8c7be95e 1145 goto fail_child;
034c6ed7
LP		 1146 }
1147
da726a4d
LP		 1148 /* If a socket is connected to STDIN/STDOUT/STDERR, we
1149 * must sure to drop O_NONBLOCK */
1150 if (socket_fd >= 0)
1151 fd_nonblock(socket_fd, false);
1152
80876c20 1153 if (!keep_stdin)
1e3ad081 1154 if (setup_input(context, socket_fd, apply_tty_stdin) < 0) {
80876c20 1155 r = EXIT_STDIN;
8c7be95e 1156 goto fail_child;
80876c20 1157 }
9eba9da4 1158
80876c20 1159 if (!keep_stdout)
1e3ad081 1160 if (setup_output(context, socket_fd, file_name_from_path(command->path), apply_tty_stdin) < 0) {
80876c20 1161 r = EXIT_STDOUT;
8c7be95e 1162 goto fail_child;
80876c20 1163 }
94f04347 1164
1e3ad081 1165 if (setup_error(context, socket_fd, file_name_from_path(command->path), apply_tty_stdin) < 0) {
80876c20 1166 r = EXIT_STDERR;
8c7be95e 1167 goto fail_child;
071830ff
LP		 1168 }
1169
8e274523 1170 if (cgroup_bondings)
e364ad06 1171 if (cgroup_bonding_install_list(cgroup_bondings, 0) < 0) {
8e274523 1172 r = EXIT_CGROUP;
8c7be95e 1173 goto fail_child;
8e274523
LP		 1174 }
1175
dd6c17b1 1176 if (context->oom_score_adjust_set) {
fb33a393 1177 char t[16];
034c6ed7 1178
dd6c17b1 1179 snprintf(t, sizeof(t), "%i", context->oom_score_adjust);
fb33a393 1180 char_array_0(t);
034c6ed7 1181
dd6c17b1
LP		 1182 if (write_one_line_file("/proc/self/oom_score_adj", t) < 0) {
1183 /* Compatibility with Linux <= 2.6.35 */
1184
1185 int adj;
1186
1187 adj = (context->oom_score_adjust * -OOM_DISABLE) / OOM_SCORE_ADJ_MAX;
1188 adj = CLAMP(adj, OOM_DISABLE, OOM_ADJUST_MAX);
1189
1190 snprintf(t, sizeof(t), "%i", adj);
1191 char_array_0(t);
1192
90a5f6e4
LP		 1193 if (write_one_line_file("/proc/self/oom_adj", t) < 0
1194 && errno != EACCES) {
dd6c17b1 1195 r = EXIT_OOM_ADJUST;
8c7be95e 1196 goto fail_child;
dd6c17b1 1197 }
fb33a393 1198 }
034c6ed7
LP		 1199 }
1200
fb33a393
LP		 1201 if (context->nice_set)
1202 if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
1203 r = EXIT_NICE;
8c7be95e 1204 goto fail_child;
fb33a393
LP		 1205 }
1206
94f04347
LP		 1207 if (context->cpu_sched_set) {
1208 struct sched_param param;
1209
1210 zero(param);
1211 param.sched_priority = context->cpu_sched_priority;
1212
38b48754
LP		 1213 if (sched_setscheduler(0, context->cpu_sched_policy |
1214 (context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), &param) < 0) {
94f04347 1215 r = EXIT_SETSCHEDULER;
8c7be95e 1216 goto fail_child;
94f04347
LP		 1217 }
1218 }
1219
82c121a4
LP		 1220 if (context->cpuset)
1221 if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
94f04347 1222 r = EXIT_CPUAFFINITY;
8c7be95e 1223 goto fail_child;
94f04347
LP		 1224 }
1225
9eba9da4
LP		 1226 if (context->ioprio_set)
1227 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
1228 r = EXIT_IOPRIO;
8c7be95e 1229 goto fail_child;
9eba9da4
LP		 1230 }
1231
03fae018
LP		 1232 if (context->timer_slack_nsec_set)
1233 if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
94f04347 1234 r = EXIT_TIMERSLACK;
8c7be95e 1235 goto fail_child;
94f04347
LP		 1236 }
1237
169c1bda
LP		 1238 if (context->utmp_id)
1239 utmp_put_init_process(0, context->utmp_id, getpid(), getsid(0), context->tty_path);
1240
81a2b7ce
LP		 1241 if (context->user) {
1242 username = context->user;
1243 if (get_user_creds(&username, &uid, &gid, &home) < 0) {
1244 r = EXIT_USER;
8c7be95e 1245 goto fail_child;
81a2b7ce 1246 }
d8b4e2e9
LP		 1247
1248 if (is_terminal_input(context->std_input))
1249 if (chown_terminal(STDIN_FILENO, uid) < 0) {
1250 r = EXIT_STDIN;
8c7be95e 1251 goto fail_child;
d8b4e2e9 1252 }
64747e2d
LP		 1253
1254 if (cgroup_bondings && context->control_group_modify)
1255 if (cgroup_bonding_set_group_access_list(cgroup_bondings, 0755, uid, gid) < 0 ||
1256 cgroup_bonding_set_task_access_list(cgroup_bondings, 0644, uid, gid) < 0) {
1257 r = EXIT_CGROUP;
1258 goto fail_child;
1259 }
81a2b7ce
LP		 1260 }
1261
3b8bddde
LP		 1262 if (apply_permissions)
1263 if (enforce_groups(context, username, uid) < 0) {
1264 r = EXIT_GROUP;
1265 goto fail_child;
1266 }
1267
1268 umask(context->umask);
1269
5b6319dc
LP		 1270#ifdef HAVE_PAM
1271 if (context->pam_name && username) {
5b6319dc
LP		 1272 if (setup_pam(context->pam_name, username, context->tty_path, &pam_env, fds, n_fds) < 0) {
1273 r = EXIT_PAM;
8c7be95e 1274 goto fail_child;
5b6319dc
LP		 1275 }
1276 }
1277#endif
1278
04aa0cb9
LP		 1279 if (strv_length(context->read_write_dirs) > 0 ||
1280 strv_length(context->read_only_dirs) > 0 ||
1281 strv_length(context->inaccessible_dirs) > 0 ||
1282 context->mount_flags != MS_SHARED ||
1283 context->private_tmp)
1284 if ((r = setup_namespace(
1285 context->read_write_dirs,
1286 context->read_only_dirs,
1287 context->inaccessible_dirs,
1288 context->private_tmp,
1289 context->mount_flags)) < 0)
8c7be95e 1290 goto fail_child;
04aa0cb9 1291
81a2b7ce
LP		 1292 if (apply_chroot) {
1293 if (context->root_directory)
1294 if (chroot(context->root_directory) < 0) {
1295 r = EXIT_CHROOT;
8c7be95e 1296 goto fail_child;
81a2b7ce
LP		 1297 }
1298
1299 if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
1300 r = EXIT_CHDIR;
8c7be95e 1301 goto fail_child;
81a2b7ce
LP		 1302 }
1303 } else {
1304
1305 char *d;
1306
1307 if (asprintf(&d, "%s/%s",
1308 context->root_directory ? context->root_directory : "",
1309 context->working_directory ? context->working_directory : "") < 0) {
1310 r = EXIT_MEMORY;
8c7be95e 1311 goto fail_child;
81a2b7ce
LP		 1312 }
1313
1314 if (chdir(d) < 0) {
1315 free(d);
1316 r = EXIT_CHDIR;
8c7be95e 1317 goto fail_child;
81a2b7ce
LP		 1318 }
1319
1320 free(d);
1321 }
1322
fc9b2a84
LP		 1323 /* We repeat the fd closing here, to make sure that
1324 * nothing is leaked from the PAM modules */
a0d40ac5 1325 if (close_all_fds(fds, n_fds) < 0 ||
47a71eed 1326 shift_fds(fds, n_fds) < 0 ||
451a074f 1327 flags_fds(fds, n_fds, context->non_blocking) < 0) {
034c6ed7 1328 r = EXIT_FDS;
8c7be95e 1329 goto fail_child;
034c6ed7
LP		 1330 }
1331
81a2b7ce 1332 if (apply_permissions) {
034c6ed7 1333
81a2b7ce
LP		 1334 for (i = 0; i < RLIMIT_NLIMITS; i++) {
1335 if (!context->rlimit[i])
1336 continue;
1337
1338 if (setrlimit(i, context->rlimit[i]) < 0) {
1339 r = EXIT_LIMITS;
8c7be95e 1340 goto fail_child;
81a2b7ce 1341 }
034c6ed7 1342 }
034c6ed7 1343
260abb78 1344 if (context->capability_bounding_set_drop)
73090dc8
LP		 1345 if (do_capability_bounding_set_drop(context->capability_bounding_set_drop) < 0) {
1346 r = EXIT_CAPABILITIES;
1347 goto fail_child;
1348 }
260abb78 1349
81a2b7ce
LP		 1350 if (context->user)
1351 if (enforce_user(context, uid) < 0) {
1352 r = EXIT_USER;
8c7be95e 1353 goto fail_child;
81a2b7ce
LP		 1354 }
1355
35b8ca3a 1356 /* PR_GET_SECUREBITS is not privileged, while
693ced48
LP		 1357 * PR_SET_SECUREBITS is. So to suppress
1358 * potential EPERMs we'll try not to call
1359 * PR_SET_SECUREBITS unless necessary. */
1360 if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
1361 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
1362 r = EXIT_SECUREBITS;
8c7be95e 1363 goto fail_child;
693ced48 1364 }
81a2b7ce
LP		 1365
1366 if (context->capabilities)
1367 if (cap_set_proc(context->capabilities) < 0) {
1368 r = EXIT_CAPABILITIES;
8c7be95e 1369 goto fail_child;
81a2b7ce 1370 }
94f04347
LP		 1371 }
1372
e3aa71c3 1373 if (!(our_env = new0(char*, 7))) {
81a2b7ce 1374 r = EXIT_MEMORY;
8c7be95e 1375 goto fail_child;
81a2b7ce 1376 }
034c6ed7 1377
81a2b7ce 1378 if (n_fds > 0)
bb00e604 1379 if (asprintf(our_env + n_env++, "LISTEN_PID=%lu", (unsigned long) getpid()) < 0 ||
81a2b7ce
LP		 1380 asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0) {
1381 r = EXIT_MEMORY;
8c7be95e 1382 goto fail_child;
81a2b7ce 1383 }
034c6ed7 1384
81a2b7ce
LP		 1385 if (home)
1386 if (asprintf(our_env + n_env++, "HOME=%s", home) < 0) {
1387 r = EXIT_MEMORY;
8c7be95e 1388 goto fail_child;
81a2b7ce 1389 }
034c6ed7 1390
81a2b7ce
LP		 1391 if (username)
1392 if (asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 ||
1393 asprintf(our_env + n_env++, "USER=%s", username) < 0) {
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))))) {
1402 r = EXIT_MEMORY;
8c7be95e 1403 goto fail_child;
e3aa71c3
LP		 1404 }
1405
1406 assert(n_env <= 7);
4e85aff4 1407
5b6319dc 1408 if (!(final_env = strv_env_merge(
8c7be95e 1409 5,
5b6319dc
LP		 1410 environment,
1411 our_env,
1412 context->environment,
8c7be95e 1413 files_env,
5b6319dc
LP		 1414 pam_env,
1415 NULL))) {
81a2b7ce 1416 r = EXIT_MEMORY;
8c7be95e 1417 goto fail_child;
81a2b7ce 1418 }
034c6ed7 1419
fab56fc5
LP		 1420 if (!(final_argv = replace_env_argv(argv, final_env))) {
1421 r = EXIT_MEMORY;
8c7be95e 1422 goto fail_child;
fab56fc5
LP		 1423 }
1424
a6ff950e
LP		 1425 final_env = strv_env_clean(final_env);
1426
fab56fc5 1427 execve(command->path, final_argv, final_env);
034c6ed7
LP		 1428 r = EXIT_EXEC;
1429
8c7be95e 1430 fail_child:
81a2b7ce
LP		 1431 strv_free(our_env);
1432 strv_free(final_env);
5b6319dc 1433 strv_free(pam_env);
8c7be95e 1434 strv_free(files_env);
fab56fc5 1435 strv_free(final_argv);
81a2b7ce 1436
80876c20
LP		 1437 if (saved_stdin >= 0)
1438 close_nointr_nofail(saved_stdin);
1439
1440 if (saved_stdout >= 0)
1441 close_nointr_nofail(saved_stdout);
1442
034c6ed7
LP		 1443 _exit(r);
1444 }
1445
8c7be95e
LP		 1446 strv_free(files_env);
1447
80876c20
LP		 1448 /* We add the new process to the cgroup both in the child (so
1449 * that we can be sure that no user code is ever executed
1450 * outside of the cgroup) and in the parent (so that we can be
1451 * sure that when we kill the cgroup the process will be
1452 * killed too). */
1453 if (cgroup_bondings)
4e85aff4 1454 cgroup_bonding_install_list(cgroup_bondings, pid);
2da3263a 1455
bb00e604 1456 log_debug("Forked %s as %lu", command->path, (unsigned long) pid);
2da3263a 1457
b58b4116 1458 exec_status_start(&command->exec_status, pid);
9fb86720 1459
034c6ed7 1460 *ret = pid;
5cb5a6ff 1461 return 0;
8c7be95e
LP		 1462
1463fail_parent:
1464 strv_free(files_env);
1465
1466 return r;
5cb5a6ff
LP		 1467}
1468
034c6ed7
LP		 1469void exec_context_init(ExecContext *c) {
1470 assert(c);
1471
1472 c->umask = 0002;
9eba9da4 1473 c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
94f04347 1474 c->cpu_sched_policy = SCHED_OTHER;
071830ff 1475 c->syslog_priority = LOG_DAEMON|LOG_INFO;
74922904 1476 c->syslog_level_prefix = true;
15ae422b 1477 c->mount_flags = MS_SHARED;
2e22afe9 1478 c->kill_signal = SIGTERM;
ba035df2 1479 c->send_sigkill = true;
034c6ed7
LP		 1480}
1481
1482void exec_context_done(ExecContext *c) {
5cb5a6ff
LP		 1483 unsigned l;
1484
1485 assert(c);
1486
1487 strv_free(c->environment);
034c6ed7 1488 c->environment = NULL;
5cb5a6ff 1489
8c7be95e
LP		 1490 strv_free(c->environment_files);
1491 c->environment_files = NULL;
1492
034c6ed7 1493 for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
5cb5a6ff 1494 free(c->rlimit[l]);
034c6ed7
LP		 1495 c->rlimit[l] = NULL;
1496 }
1497
9eba9da4
LP		 1498 free(c->working_directory);
1499 c->working_directory = NULL;
1500 free(c->root_directory);
1501 c->root_directory = NULL;
5cb5a6ff 1502
80876c20
LP		 1503 free(c->tty_path);
1504 c->tty_path = NULL;
1505
df1f0afe
LP		 1506 free(c->tcpwrap_name);
1507 c->tcpwrap_name = NULL;
1508
071830ff
LP		 1509 free(c->syslog_identifier);
1510 c->syslog_identifier = NULL;
1511
5cb5a6ff 1512 free(c->user);
034c6ed7
LP		 1513 c->user = NULL;
1514
5cb5a6ff 1515 free(c->group);
034c6ed7
LP		 1516 c->group = NULL;
1517
1518 strv_free(c->supplementary_groups);
1519 c->supplementary_groups = NULL;
94f04347 1520
5b6319dc
LP		 1521 free(c->pam_name);
1522 c->pam_name = NULL;
1523
94f04347
LP		 1524 if (c->capabilities) {
1525 cap_free(c->capabilities);
1526 c->capabilities = NULL;
1527 }
15ae422b
LP		 1528
1529 strv_free(c->read_only_dirs);
1530 c->read_only_dirs = NULL;
1531
1532 strv_free(c->read_write_dirs);
1533 c->read_write_dirs = NULL;
1534
1535 strv_free(c->inaccessible_dirs);
1536 c->inaccessible_dirs = NULL;
82c121a4
LP		 1537
1538 if (c->cpuset)
1539 CPU_FREE(c->cpuset);
86a3475b
LP		 1540
1541 free(c->utmp_id);
1542 c->utmp_id = NULL;
5cb5a6ff
LP		 1543}
1544
43d0fcbd
LP		 1545void exec_command_done(ExecCommand *c) {
1546 assert(c);
1547
1548 free(c->path);
1549 c->path = NULL;
1550
1551 strv_free(c->argv);
1552 c->argv = NULL;
1553}
1554
1555void exec_command_done_array(ExecCommand *c, unsigned n) {
1556 unsigned i;
1557
1558 for (i = 0; i < n; i++)
1559 exec_command_done(c+i);
1560}
1561
5cb5a6ff
LP		 1562void exec_command_free_list(ExecCommand *c) {
1563 ExecCommand *i;
1564
1565 while ((i = c)) {
034c6ed7 1566 LIST_REMOVE(ExecCommand, command, c, i);
43d0fcbd 1567 exec_command_done(i);
5cb5a6ff
LP		 1568 free(i);
1569 }
1570}
1571
034c6ed7
LP		 1572void exec_command_free_array(ExecCommand **c, unsigned n) {
1573 unsigned i;
1574
1575 for (i = 0; i < n; i++) {
1576 exec_command_free_list(c[i]);
1577 c[i] = NULL;
1578 }
1579}
1580
8c7be95e
LP		 1581int exec_context_load_environment(const ExecContext *c, char ***l) {
1582 char **i, **r = NULL;
1583
1584 assert(c);
1585 assert(l);
1586
1587 STRV_FOREACH(i, c->environment_files) {
1588 char *fn;
1589 int k;
1590 bool ignore = false;
1591 char **p;
1592
1593 fn = *i;
1594
1595 if (fn[0] == '-') {
1596 ignore = true;
1597 fn ++;
1598 }
1599
1600 if (!path_is_absolute(fn)) {
1601
1602 if (ignore)
1603 continue;
1604
1605 strv_free(r);
1606 return -EINVAL;
1607 }
1608
1609 if ((k = load_env_file(fn, &p)) < 0) {
1610
1611 if (ignore)
1612 continue;
1613
1614 strv_free(r);
1615 return k;
1616 }
1617
1618 if (r == NULL)
1619 r = p;
1620 else {
1621 char **m;
1622
1623 m = strv_env_merge(2, r, p);
1624 strv_free(r);
1625 strv_free(p);
1626
1627 if (!m)
1628 return -ENOMEM;
1629
1630 r = m;
1631 }
1632 }
1633
1634 *l = r;
1635
1636 return 0;
1637}
1638
15ae422b
LP		 1639static void strv_fprintf(FILE *f, char **l) {
1640 char **g;
1641
1642 assert(f);
1643
1644 STRV_FOREACH(g, l)
1645 fprintf(f, " %s", *g);
1646}
1647
5cb5a6ff 1648void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
94f04347
LP		 1649 char ** e;
1650 unsigned i;
9eba9da4 1651
5cb5a6ff
LP		 1652 assert(c);
1653 assert(f);
1654
1655 if (!prefix)
1656 prefix = "";
1657
1658 fprintf(f,
94f04347
LP		 1659 "%sUMask: %04o\n"
1660 "%sWorkingDirectory: %s\n"
451a074f 1661 "%sRootDirectory: %s\n"
15ae422b 1662 "%sNonBlocking: %s\n"
64747e2d
LP		 1663 "%sPrivateTmp: %s\n"
1664 "%sControlGroupModify: %s\n",
5cb5a6ff 1665 prefix, c->umask,
9eba9da4 1666 prefix, c->working_directory ? c->working_directory : "/",
451a074f 1667 prefix, c->root_directory ? c->root_directory : "/",
15ae422b 1668 prefix, yes_no(c->non_blocking),
64747e2d
LP		 1669 prefix, yes_no(c->private_tmp),
1670 prefix, yes_no(c->control_group_modify));
fb33a393 1671
8c7be95e
LP		 1672 STRV_FOREACH(e, c->environment)
1673 fprintf(f, "%sEnvironment: %s\n", prefix, *e);
1674
1675 STRV_FOREACH(e, c->environment_files)
1676 fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e);
94f04347 1677
df1f0afe
LP		 1678 if (c->tcpwrap_name)
1679 fprintf(f,
1680 "%sTCPWrapName: %s\n",
1681 prefix, c->tcpwrap_name);
1682
fb33a393
LP		 1683 if (c->nice_set)
1684 fprintf(f,
1685 "%sNice: %i\n",
1686 prefix, c->nice);
1687
dd6c17b1 1688 if (c->oom_score_adjust_set)
fb33a393 1689 fprintf(f,
dd6c17b1
LP		 1690 "%sOOMScoreAdjust: %i\n",
1691 prefix, c->oom_score_adjust);
9eba9da4 1692
94f04347
LP		 1693 for (i = 0; i < RLIM_NLIMITS; i++)
1694 if (c->rlimit[i])
ea430986 1695 fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
94f04347 1696
9eba9da4
LP		 1697 if (c->ioprio_set)
1698 fprintf(f,
1699 "%sIOSchedulingClass: %s\n"
1700 "%sIOPriority: %i\n",
94f04347 1701 prefix, ioprio_class_to_string(IOPRIO_PRIO_CLASS(c->ioprio)),
9eba9da4 1702 prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
94f04347
LP		 1703
1704 if (c->cpu_sched_set)
1705 fprintf(f,
1706 "%sCPUSchedulingPolicy: %s\n"
38b48754
LP		 1707 "%sCPUSchedulingPriority: %i\n"
1708 "%sCPUSchedulingResetOnFork: %s\n",
94f04347 1709 prefix, sched_policy_to_string(c->cpu_sched_policy),
38b48754
LP		 1710 prefix, c->cpu_sched_priority,
1711 prefix, yes_no(c->cpu_sched_reset_on_fork));
94f04347 1712
82c121a4 1713 if (c->cpuset) {
94f04347 1714 fprintf(f, "%sCPUAffinity:", prefix);
82c121a4
LP		 1715 for (i = 0; i < c->cpuset_ncpus; i++)
1716 if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset))
94f04347
LP		 1717 fprintf(f, " %i", i);
1718 fputs("\n", f);
1719 }
1720
03fae018
LP		 1721 if (c->timer_slack_nsec_set)
1722 fprintf(f, "%sTimerSlackNSec: %lu\n", prefix, c->timer_slack_nsec);
94f04347
LP		 1723
1724 fprintf(f,
80876c20
LP		 1725 "%sStandardInput: %s\n"
1726 "%sStandardOutput: %s\n"
1727 "%sStandardError: %s\n",
1728 prefix, exec_input_to_string(c->std_input),
1729 prefix, exec_output_to_string(c->std_output),
1730 prefix, exec_output_to_string(c->std_error));
1731
1732 if (c->tty_path)
1733 fprintf(f,
6ea832a2
LP		 1734 "%sTTYPath: %s\n"
1735 "%sTTYReset: %s\n"
1736 "%sTTYVHangup: %s\n"
1737 "%sTTYVTDisallocate: %s\n",
1738 prefix, c->tty_path,
1739 prefix, yes_no(c->tty_reset),
1740 prefix, yes_no(c->tty_vhangup),
1741 prefix, yes_no(c->tty_vt_disallocate));
94f04347 1742
9a6bca7a 1743 if (c->std_output == EXEC_OUTPUT_SYSLOG || c->std_output == EXEC_OUTPUT_KMSG ||
28dbc1e8
LP		 1744 c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
1745 c->std_error == EXEC_OUTPUT_SYSLOG || c->std_error == EXEC_OUTPUT_KMSG ||
1746 c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE)
94f04347
LP		 1747 fprintf(f,
1748 "%sSyslogFacility: %s\n"
1749 "%sSyslogLevel: %s\n",
7d76f312 1750 prefix, log_facility_unshifted_to_string(c->syslog_priority >> 3),
94f04347
LP		 1751 prefix, log_level_to_string(LOG_PRI(c->syslog_priority)));
1752
1753 if (c->capabilities) {
1754 char *t;
1755 if ((t = cap_to_text(c->capabilities, NULL))) {
1756 fprintf(f, "%sCapabilities: %s\n",
1757 prefix, t);
1758 cap_free(t);
1759 }
1760 }
1761
1762 if (c->secure_bits)
1763 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
1764 prefix,
1765 (c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "",
1766 (c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
1767 (c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
1768 (c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
1769 (c->secure_bits & SECURE_NOROOT) ? " noroot" : "",
1770 (c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
1771
1772 if (c->capability_bounding_set_drop) {
ae556c21 1773 unsigned long l;
260abb78 1774 fprintf(f, "%sCapabilityBoundingSet:", prefix);
94f04347 1775
ae556c21
LP		 1776 for (l = 0; l <= (unsigned long) CAP_LAST_CAP; l++)
1777 if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) {
94f04347
LP		 1778 char *t;
1779
ae556c21 1780 if ((t = cap_to_name(l))) {
94f04347 1781 fprintf(f, " %s", t);
260abb78 1782 cap_free(t);
94f04347
LP		 1783 }
1784 }
1785
1786 fputs("\n", f);
1787 }
1788
1789 if (c->user)
f2d3769a 1790 fprintf(f, "%sUser: %s\n", prefix, c->user);
94f04347 1791 if (c->group)
f2d3769a 1792 fprintf(f, "%sGroup: %s\n", prefix, c->group);
94f04347 1793
15ae422b 1794 if (strv_length(c->supplementary_groups) > 0) {
94f04347 1795 fprintf(f, "%sSupplementaryGroups:", prefix);
15ae422b
LP		 1796 strv_fprintf(f, c->supplementary_groups);
1797 fputs("\n", f);
1798 }
94f04347 1799
5b6319dc 1800 if (c->pam_name)
f2d3769a 1801 fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name);
5b6319dc 1802
15ae422b
LP		 1803 if (strv_length(c->read_write_dirs) > 0) {
1804 fprintf(f, "%sReadWriteDirs:", prefix);
1805 strv_fprintf(f, c->read_write_dirs);
1806 fputs("\n", f);
1807 }
1808
1809 if (strv_length(c->read_only_dirs) > 0) {
1810 fprintf(f, "%sReadOnlyDirs:", prefix);
1811 strv_fprintf(f, c->read_only_dirs);
1812 fputs("\n", f);
1813 }
94f04347 1814
15ae422b
LP		 1815 if (strv_length(c->inaccessible_dirs) > 0) {
1816 fprintf(f, "%sInaccessibleDirs:", prefix);
1817 strv_fprintf(f, c->inaccessible_dirs);
94f04347
LP		 1818 fputs("\n", f);
1819 }
2e22afe9
LP		 1820
1821 fprintf(f,
1822 "%sKillMode: %s\n"
ba035df2
LP		 1823 "%sKillSignal: SIG%s\n"
1824 "%sSendSIGKILL: %s\n",
2e22afe9 1825 prefix, kill_mode_to_string(c->kill_mode),
ba035df2
LP		 1826 prefix, signal_to_string(c->kill_signal),
1827 prefix, yes_no(c->send_sigkill));
169c1bda
LP		 1828
1829 if (c->utmp_id)
1830 fprintf(f,
1831 "%sUtmpIdentifier: %s\n",
1832 prefix, c->utmp_id);
5cb5a6ff
LP		 1833}
1834
b58b4116 1835void exec_status_start(ExecStatus *s, pid_t pid) {
034c6ed7 1836 assert(s);
5cb5a6ff 1837
b58b4116
LP		 1838 zero(*s);
1839 s->pid = pid;
1840 dual_timestamp_get(&s->start_timestamp);
1841}
1842
6ea832a2 1843void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) {
b58b4116
LP		 1844 assert(s);
1845
1846 if ((s->pid && s->pid != pid) ||
1847 !s->start_timestamp.realtime <= 0)
1848 zero(*s);
1849
034c6ed7 1850 s->pid = pid;
63983207 1851 dual_timestamp_get(&s->exit_timestamp);
9fb86720 1852
034c6ed7
LP		 1853 s->code = code;
1854 s->status = status;
169c1bda 1855
6ea832a2
LP		 1856 if (context) {
1857 if (context->utmp_id)
1858 utmp_put_dead_process(context->utmp_id, pid, code, status);
1859
1860 exec_context_tty_reset(context);
1861 }
9fb86720
LP		 1862}
1863
1864void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
1865 char buf[FORMAT_TIMESTAMP_MAX];
1866
1867 assert(s);
1868 assert(f);
1869
1870 if (!prefix)
1871 prefix = "";
1872
1873 if (s->pid <= 0)
1874 return;
1875
1876 fprintf(f,
bb00e604
LP		 1877 "%sPID: %lu\n",
1878 prefix, (unsigned long) s->pid);
9fb86720 1879
63983207 1880 if (s->start_timestamp.realtime > 0)
9fb86720
LP		 1881 fprintf(f,
1882 "%sStart Timestamp: %s\n",
63983207 1883 prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime));
9fb86720 1884
63983207 1885 if (s->exit_timestamp.realtime > 0)
9fb86720
LP		 1886 fprintf(f,
1887 "%sExit Timestamp: %s\n"
1888 "%sExit Code: %s\n"
1889 "%sExit Status: %i\n",
63983207 1890 prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime),
9fb86720
LP		 1891 prefix, sigchld_code_to_string(s->code),
1892 prefix, s->status);
5cb5a6ff 1893}
44d8db9e 1894
9e2f7c11 1895char *exec_command_line(char **argv) {
44d8db9e
LP		 1896 size_t k;
1897 char *n, *p, **a;
1898 bool first = true;
1899
9e2f7c11 1900 assert(argv);
44d8db9e 1901
9164977d 1902 k = 1;
9e2f7c11 1903 STRV_FOREACH(a, argv)
44d8db9e
LP		 1904 k += strlen(*a)+3;
1905
1906 if (!(n = new(char, k)))
1907 return NULL;
1908
1909 p = n;
9e2f7c11 1910 STRV_FOREACH(a, argv) {
44d8db9e
LP		 1911
1912 if (!first)
1913 *(p++) = ' ';
1914 else
1915 first = false;
1916
1917 if (strpbrk(*a, WHITESPACE)) {
1918 *(p++) = '\'';
1919 p = stpcpy(p, *a);
1920 *(p++) = '\'';
1921 } else
1922 p = stpcpy(p, *a);
1923
1924 }
1925
9164977d
LP		 1926 *p = 0;
1927
44d8db9e
LP		 1928 /* FIXME: this doesn't really handle arguments that have
1929 * spaces and ticks in them */
1930
1931 return n;
1932}
1933
1934void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
9fb86720
LP		 1935 char *p2;
1936 const char *prefix2;
1937
44d8db9e
LP		 1938 char *cmd;
1939
1940 assert(c);
1941 assert(f);
1942
1943 if (!prefix)
1944 prefix = "";
9fb86720
LP		 1945 p2 = strappend(prefix, "\t");
1946 prefix2 = p2 ? p2 : prefix;
44d8db9e 1947
9e2f7c11 1948 cmd = exec_command_line(c->argv);
44d8db9e
LP		 1949
1950 fprintf(f,
1951 "%sCommand Line: %s\n",
1952 prefix, cmd ? cmd : strerror(ENOMEM));
1953
1954 free(cmd);
9fb86720
LP		 1955
1956 exec_status_dump(&c->exec_status, f, prefix2);
1957
1958 free(p2);
44d8db9e
LP		 1959}
1960
1961void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
1962 assert(f);
1963
1964 if (!prefix)
1965 prefix = "";
1966
1967 LIST_FOREACH(command, c, c)
1968 exec_command_dump(c, f, prefix);
1969}
94f04347 1970
a6a80b4f
LP		 1971void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
1972 ExecCommand *end;
1973
1974 assert(l);
1975 assert(e);
1976
1977 if (*l) {
35b8ca3a 1978 /* It's kind of important, that we keep the order here */
a6a80b4f
LP		 1979 LIST_FIND_TAIL(ExecCommand, command, *l, end);
1980 LIST_INSERT_AFTER(ExecCommand, command, *l, end, e);
1981 } else
1982 *l = e;
1983}
1984
26fd040d
LP		 1985int exec_command_set(ExecCommand *c, const char *path, ...) {
1986 va_list ap;
1987 char **l, *p;
1988
1989 assert(c);
1990 assert(path);
1991
1992 va_start(ap, path);
1993 l = strv_new_ap(path, ap);
1994 va_end(ap);
1995
1996 if (!l)
1997 return -ENOMEM;
1998
1999 if (!(p = strdup(path))) {
2000 strv_free(l);
2001 return -ENOMEM;
2002 }
2003
2004 free(c->path);
2005 c->path = p;
2006
2007 strv_free(c->argv);
2008 c->argv = l;
2009
2010 return 0;
2011}
2012
80876c20
LP		 2013static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
2014 [EXEC_INPUT_NULL] = "null",
2015 [EXEC_INPUT_TTY] = "tty",
2016 [EXEC_INPUT_TTY_FORCE] = "tty-force",
4f2d528d
LP		 2017 [EXEC_INPUT_TTY_FAIL] = "tty-fail",
2018 [EXEC_INPUT_SOCKET] = "socket"
80876c20
LP		 2019};
2020
8a0867d6
LP		 2021DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
2022
94f04347 2023static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
80876c20 2024 [EXEC_OUTPUT_INHERIT] = "inherit",
94f04347 2025 [EXEC_OUTPUT_NULL] = "null",
80876c20 2026 [EXEC_OUTPUT_TTY] = "tty",
94f04347 2027 [EXEC_OUTPUT_SYSLOG] = "syslog",
28dbc1e8 2028 [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console",
9a6bca7a 2029 [EXEC_OUTPUT_KMSG] = "kmsg",
28dbc1e8 2030 [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console",
4f2d528d 2031 [EXEC_OUTPUT_SOCKET] = "socket"
94f04347
LP		 2032};
2033
2034DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
2035
8a0867d6
LP		 2036static const char* const kill_mode_table[_KILL_MODE_MAX] = {
2037 [KILL_CONTROL_GROUP] = "control-group",
8a0867d6
LP		 2038 [KILL_PROCESS] = "process",
2039 [KILL_NONE] = "none"
2040};
2041
2042DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);
2043
2044static const char* const kill_who_table[_KILL_WHO_MAX] = {
2045 [KILL_MAIN] = "main",
2046 [KILL_CONTROL] = "control",
2047 [KILL_ALL] = "all"
2048};
2049
2050DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);
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