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readahead: disable collector automatically on read-only media
[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"
5cb5a6ff 58
02a51aba
LP		 59/* This assumes there is a 'tty' group */
60#define TTY_MODE 0620
61
034c6ed7
LP		 62static int shift_fds(int fds[], unsigned n_fds) {
63 int start, restart_from;
64
65 if (n_fds <= 0)
66 return 0;
67
a0d40ac5
LP		 68 /* Modifies the fds array! (sorts it) */
69
034c6ed7
LP		 70 assert(fds);
71
72 start = 0;
73 for (;;) {
74 int i;
75
76 restart_from = -1;
77
78 for (i = start; i < (int) n_fds; i++) {
79 int nfd;
80
81 /* Already at right index? */
82 if (fds[i] == i+3)
83 continue;
84
85 if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
86 return -errno;
87
e1f5e051 88 close_nointr_nofail(fds[i]);
034c6ed7
LP		 89 fds[i] = nfd;
90
91 /* Hmm, the fd we wanted isn't free? Then
92 * let's remember that and try again from here*/
93 if (nfd != i+3 && restart_from < 0)
94 restart_from = i;
95 }
96
97 if (restart_from < 0)
98 break;
99
100 start = restart_from;
101 }
102
103 return 0;
104}
105
c2748801 106static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) {
47a71eed 107 unsigned i;
e2c76839 108 int r;
47a71eed
LP		 109
110 if (n_fds <= 0)
111 return 0;
112
113 assert(fds);
114
451a074f 115 /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
47a71eed
LP		 116
117 for (i = 0; i < n_fds; i++) {
47a71eed 118
e2c76839
LP		 119 if ((r = fd_nonblock(fds[i], nonblock)) < 0)
120 return r;
47a71eed 121
451a074f
LP		 122 /* We unconditionally drop FD_CLOEXEC from the fds,
123 * since after all we want to pass these fds to our
124 * children */
47a71eed 125
e2c76839
LP		 126 if ((r = fd_cloexec(fds[i], false)) < 0)
127 return r;
47a71eed
LP		 128 }
129
130 return 0;
131}
132
80876c20
LP		 133static const char *tty_path(const ExecContext *context) {
134 assert(context);
135
136 if (context->tty_path)
137 return context->tty_path;
138
139 return "/dev/console";
140}
141
142static int open_null_as(int flags, int nfd) {
143 int fd, r;
071830ff 144
80876c20 145 assert(nfd >= 0);
071830ff 146
80876c20 147 if ((fd = open("/dev/null", flags|O_NOCTTY)) < 0)
071830ff
LP		 148 return -errno;
149
80876c20
LP		 150 if (fd != nfd) {
151 r = dup2(fd, nfd) < 0 ? -errno : nfd;
e1f5e051 152 close_nointr_nofail(fd);
80876c20
LP		 153 } else
154 r = nfd;
071830ff 155
80876c20 156 return r;
071830ff
LP		 157}
158
80876c20
LP		 159static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, int nfd) {
160 int fd, r;
161 union {
162 struct sockaddr sa;
163 struct sockaddr_un un;
164 } sa;
071830ff
LP		 165
166 assert(context);
80876c20
LP		 167 assert(output < _EXEC_OUTPUT_MAX);
168 assert(ident);
169 assert(nfd >= 0);
071830ff 170
80876c20
LP		 171 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
172 return -errno;
071830ff 173
80876c20
LP		 174 zero(sa);
175 sa.sa.sa_family = AF_UNIX;
176 strncpy(sa.un.sun_path+1, LOGGER_SOCKET, sizeof(sa.un.sun_path)-1);
071830ff 177
0e098b15 178 if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + sizeof(LOGGER_SOCKET) - 1) < 0) {
80876c20
LP		 179 close_nointr_nofail(fd);
180 return -errno;
181 }
071830ff 182
80876c20
LP		 183 if (shutdown(fd, SHUT_RD) < 0) {
184 close_nointr_nofail(fd);
185 return -errno;
186 }
071830ff 187
80876c20
LP		 188 /* We speak a very simple protocol between log server
189 * and client: one line for the log destination (kmsg
190 * or syslog), followed by the priority field,
191 * followed by the process name. Since we replaced
192 * stdin/stderr we simple use stdio to write to
193 * it. Note that we use stderr, to minimize buffer
194 * flushing issues. */
195
196 dprintf(fd,
197 "%s\n"
198 "%i\n"
4f4a1dbf
LP		 199 "%s\n"
200 "%i\n",
28dbc1e8
LP		 201 output == EXEC_OUTPUT_KMSG ? "kmsg" :
202 output == EXEC_OUTPUT_KMSG_AND_CONSOLE ? "kmsg+console" :
203 output == EXEC_OUTPUT_SYSLOG ? "syslog" :
204 "syslog+console",
80876c20 205 context->syslog_priority,
4f4a1dbf 206 context->syslog_identifier ? context->syslog_identifier : ident,
74922904 207 context->syslog_level_prefix);
80876c20
LP		 208
209 if (fd != nfd) {
210 r = dup2(fd, nfd) < 0 ? -errno : nfd;
e1f5e051 211 close_nointr_nofail(fd);
80876c20
LP		 212 } else
213 r = nfd;
071830ff 214
80876c20
LP		 215 return r;
216}
217static int open_terminal_as(const char *path, mode_t mode, int nfd) {
218 int fd, r;
071830ff 219
80876c20
LP		 220 assert(path);
221 assert(nfd >= 0);
071830ff 222
80876c20
LP		 223 if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
224 return fd;
071830ff 225
80876c20
LP		 226 if (fd != nfd) {
227 r = dup2(fd, nfd) < 0 ? -errno : nfd;
228 close_nointr_nofail(fd);
229 } else
230 r = nfd;
071830ff 231
80876c20
LP		 232 return r;
233}
071830ff 234
80876c20
LP		 235static bool is_terminal_input(ExecInput i) {
236 return
237 i == EXEC_INPUT_TTY ||
238 i == EXEC_INPUT_TTY_FORCE ||
239 i == EXEC_INPUT_TTY_FAIL;
240}
071830ff 241
1e3ad081
LP		 242static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) {
243
244 if (is_terminal_input(std_input) && !apply_tty_stdin)
245 return EXEC_INPUT_NULL;
071830ff 246
03fd9c49 247 if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 248 return EXEC_INPUT_NULL;
249
03fd9c49 250 return std_input;
4f2d528d
LP		 251}
252
03fd9c49 253static int fixup_output(ExecOutput std_output, int socket_fd) {
4f2d528d 254
03fd9c49 255 if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 256 return EXEC_OUTPUT_INHERIT;
257
03fd9c49 258 return std_output;
4f2d528d
LP		 259}
260
1e3ad081 261static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) {
4f2d528d
LP		 262 ExecInput i;
263
264 assert(context);
265
1e3ad081 266 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
4f2d528d
LP		 267
268 switch (i) {
071830ff 269
80876c20
LP		 270 case EXEC_INPUT_NULL:
271 return open_null_as(O_RDONLY, STDIN_FILENO);
272
273 case EXEC_INPUT_TTY:
274 case EXEC_INPUT_TTY_FORCE:
275 case EXEC_INPUT_TTY_FAIL: {
276 int fd, r;
071830ff 277
80876c20
LP		 278 if ((fd = acquire_terminal(
279 tty_path(context),
4f2d528d 280 i == EXEC_INPUT_TTY_FAIL,
21de3988
LP		 281 i == EXEC_INPUT_TTY_FORCE,
282 false)) < 0)
80876c20
LP		 283 return fd;
284
285 if (fd != STDIN_FILENO) {
286 r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
071830ff 287 close_nointr_nofail(fd);
80876c20
LP		 288 } else
289 r = STDIN_FILENO;
290
291 return r;
292 }
293
4f2d528d
LP		 294 case EXEC_INPUT_SOCKET:
295 return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
296
80876c20
LP		 297 default:
298 assert_not_reached("Unknown input type");
299 }
300}
301
1e3ad081 302static int setup_output(const ExecContext *context, int socket_fd, const char *ident, bool apply_tty_stdin) {
4f2d528d
LP		 303 ExecOutput o;
304 ExecInput i;
305
80876c20
LP		 306 assert(context);
307 assert(ident);
308
1e3ad081 309 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
03fd9c49 310 o = fixup_output(context->std_output, socket_fd);
4f2d528d 311
80876c20
LP		 312 /* This expects the input is already set up */
313
4f2d528d 314 switch (o) {
071830ff 315
80876c20
LP		 316 case EXEC_OUTPUT_INHERIT:
317
21d21ea4
LP		 318 /* If input got downgraded, inherit the original value */
319 if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input))
320 return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
321
acb591e4 322 /* If the input is connected to anything that's not a /dev/null, inherit that... */
ff876e28 323 if (i != EXEC_INPUT_NULL)
80876c20 324 return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
071830ff 325
acb591e4
LP		 326 /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */
327 if (getppid() != 1)
328 return STDOUT_FILENO;
ff876e28 329
acb591e4
LP		 330 /* We need to open /dev/null here anew, to get the
331 * right access mode. So we fall through */
80876c20
LP		 332
333 case EXEC_OUTPUT_NULL:
334 return open_null_as(O_WRONLY, STDOUT_FILENO);
335
4f2d528d
LP		 336 case EXEC_OUTPUT_TTY:
337 if (is_terminal_input(i))
80876c20
LP		 338 return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
339
340 /* We don't reset the terminal if this is just about output */
341 return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
94f04347 342
80876c20 343 case EXEC_OUTPUT_SYSLOG:
28dbc1e8 344 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
9a6bca7a 345 case EXEC_OUTPUT_KMSG:
28dbc1e8 346 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
4f2d528d
LP		 347 return connect_logger_as(context, o, ident, STDOUT_FILENO);
348
349 case EXEC_OUTPUT_SOCKET:
350 assert(socket_fd >= 0);
351 return dup2(socket_fd, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
80876c20 352
94f04347
LP		 353 default:
354 assert_not_reached("Unknown output type");
071830ff 355 }
94f04347
LP		 356}
357
1e3ad081 358static int setup_error(const ExecContext *context, int socket_fd, const char *ident, bool apply_tty_stdin) {
4f2d528d
LP		 359 ExecOutput o, e;
360 ExecInput i;
361
94f04347 362 assert(context);
02a51aba 363 assert(ident);
071830ff 364
1e3ad081 365 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
03fd9c49
LP		 366 o = fixup_output(context->std_output, socket_fd);
367 e = fixup_output(context->std_error, socket_fd);
4f2d528d 368
80876c20 369 /* This expects the input and output are already set up */
94f04347 370
80876c20
LP		 371 /* Don't change the stderr file descriptor if we inherit all
372 * the way and are not on a tty */
4f2d528d
LP		 373 if (e == EXEC_OUTPUT_INHERIT &&
374 o == EXEC_OUTPUT_INHERIT &&
acb591e4 375 i == EXEC_INPUT_NULL &&
21d21ea4 376 !is_terminal_input(context->std_input) &&
dec5d552 377 getppid () != 1)
80876c20 378 return STDERR_FILENO;
94f04347 379
21d21ea4 380 /* Duplicate from stdout if possible */
4f2d528d 381 if (e == o || e == EXEC_OUTPUT_INHERIT)
80876c20 382 return dup2(STDOUT_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
94f04347 383
4f2d528d 384 switch (e) {
80876c20
LP		 385
386 case EXEC_OUTPUT_NULL:
387 return open_null_as(O_WRONLY, STDERR_FILENO);
388
389 case EXEC_OUTPUT_TTY:
4f2d528d 390 if (is_terminal_input(i))
80876c20
LP		 391 return dup2(STDIN_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
392
393 /* We don't reset the terminal if this is just about output */
394 return open_terminal_as(tty_path(context), O_WRONLY, STDERR_FILENO);
395
396 case EXEC_OUTPUT_SYSLOG:
28dbc1e8 397 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
9a6bca7a 398 case EXEC_OUTPUT_KMSG:
28dbc1e8 399 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
4f2d528d
LP		 400 return connect_logger_as(context, e, ident, STDERR_FILENO);
401
402 case EXEC_OUTPUT_SOCKET:
403 assert(socket_fd >= 0);
404 return dup2(socket_fd, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
94f04347
LP		 405
406 default:
80876c20 407 assert_not_reached("Unknown error type");
94f04347 408 }
071830ff
LP		 409}
410
02a51aba
LP		 411static int chown_terminal(int fd, uid_t uid) {
412 struct stat st;
413
414 assert(fd >= 0);
02a51aba
LP		 415
416 /* This might fail. What matters are the results. */
bab45044
LP		 417 (void) fchown(fd, uid, -1);
418 (void) fchmod(fd, TTY_MODE);
02a51aba
LP		 419
420 if (fstat(fd, &st) < 0)
421 return -errno;
422
d8b4e2e9 423 if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
02a51aba
LP		 424 return -EPERM;
425
426 return 0;
427}
428
80876c20
LP		 429static int setup_confirm_stdio(const ExecContext *context,
430 int *_saved_stdin,
431 int *_saved_stdout) {
432 int fd = -1, saved_stdin, saved_stdout = -1, r;
433
434 assert(context);
435 assert(_saved_stdin);
436 assert(_saved_stdout);
437
438 /* This returns positive EXIT_xxx return values instead of
439 * negative errno style values! */
440
441 if ((saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3)) < 0)
442 return EXIT_STDIN;
443
444 if ((saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3)) < 0) {
445 r = EXIT_STDOUT;
446 goto fail;
447 }
448
449 if ((fd = acquire_terminal(
450 tty_path(context),
451 context->std_input == EXEC_INPUT_TTY_FAIL,
21de3988
LP		 452 context->std_input == EXEC_INPUT_TTY_FORCE,
453 false)) < 0) {
80876c20
LP		 454 r = EXIT_STDIN;
455 goto fail;
456 }
457
02a51aba
LP		 458 if (chown_terminal(fd, getuid()) < 0) {
459 r = EXIT_STDIN;
460 goto fail;
461 }
462
80876c20
LP		 463 if (dup2(fd, STDIN_FILENO) < 0) {
464 r = EXIT_STDIN;
465 goto fail;
466 }
467
468 if (dup2(fd, STDOUT_FILENO) < 0) {
469 r = EXIT_STDOUT;
470 goto fail;
471 }
472
473 if (fd >= 2)
474 close_nointr_nofail(fd);
475
476 *_saved_stdin = saved_stdin;
477 *_saved_stdout = saved_stdout;
478
479 return 0;
480
481fail:
482 if (saved_stdout >= 0)
483 close_nointr_nofail(saved_stdout);
484
485 if (saved_stdin >= 0)
486 close_nointr_nofail(saved_stdin);
487
488 if (fd >= 0)
489 close_nointr_nofail(fd);
490
491 return r;
492}
493
2608882f 494static int restore_confirm_stdio(const ExecContext *context,
80876c20
LP		 495 int *saved_stdin,
496 int *saved_stdout,
497 bool *keep_stdin,
498 bool *keep_stdout) {
499
500 assert(context);
501 assert(saved_stdin);
502 assert(*saved_stdin >= 0);
503 assert(saved_stdout);
504 assert(*saved_stdout >= 0);
505
506 /* This returns positive EXIT_xxx return values instead of
507 * negative errno style values! */
508
509 if (is_terminal_input(context->std_input)) {
510
511 /* The service wants terminal input. */
512
513 *keep_stdin = true;
514 *keep_stdout =
515 context->std_output == EXEC_OUTPUT_INHERIT ||
516 context->std_output == EXEC_OUTPUT_TTY;
517
518 } else {
519 /* If the service doesn't want a controlling terminal,
520 * then we need to get rid entirely of what we have
521 * already. */
522
523 if (release_terminal() < 0)
524 return EXIT_STDIN;
525
526 if (dup2(*saved_stdin, STDIN_FILENO) < 0)
527 return EXIT_STDIN;
528
529 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
530 return EXIT_STDOUT;
531
532 *keep_stdout = *keep_stdin = false;
533 }
534
535 return 0;
536}
537
81a2b7ce
LP		 538static int get_group_creds(const char *groupname, gid_t *gid) {
539 struct group *g;
540 unsigned long lu;
541
542 assert(groupname);
543 assert(gid);
544
545 /* We enforce some special rules for gid=0: in order to avoid
546 * NSS lookups for root we hardcode its data. */
547
548 if (streq(groupname, "root") || streq(groupname, "0")) {
549 *gid = 0;
550 return 0;
551 }
552
553 if (safe_atolu(groupname, &lu) >= 0) {
554 errno = 0;
555 g = getgrgid((gid_t) lu);
556 } else {
557 errno = 0;
558 g = getgrnam(groupname);
559 }
560
561 if (!g)
562 return errno != 0 ? -errno : -ESRCH;
563
564 *gid = g->gr_gid;
565 return 0;
566}
567
568static int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) {
569 struct passwd *p;
570 unsigned long lu;
571
572 assert(username);
573 assert(*username);
574 assert(uid);
575 assert(gid);
576 assert(home);
577
578 /* We enforce some special rules for uid=0: in order to avoid
579 * NSS lookups for root we hardcode its data. */
580
581 if (streq(*username, "root") || streq(*username, "0")) {
582 *username = "root";
583 *uid = 0;
584 *gid = 0;
585 *home = "/root";
586 return 0;
587 }
588
589 if (safe_atolu(*username, &lu) >= 0) {
590 errno = 0;
591 p = getpwuid((uid_t) lu);
592
593 /* If there are multiple users with the same id, make
594 * sure to leave $USER to the configured value instead
35b8ca3a 595 * of the first occurrence in the database. However if
81a2b7ce
LP		 596 * the uid was configured by a numeric uid, then let's
597 * pick the real username from /etc/passwd. */
598 if (*username && p)
599 *username = p->pw_name;
600 } else {
601 errno = 0;
602 p = getpwnam(*username);
603 }
604
605 if (!p)
606 return errno != 0 ? -errno : -ESRCH;
607
608 *uid = p->pw_uid;
609 *gid = p->pw_gid;
610 *home = p->pw_dir;
611 return 0;
612}
613
614static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
615 bool keep_groups = false;
616 int r;
617
618 assert(context);
619
35b8ca3a 620 /* Lookup and set GID and supplementary group list. Here too
81a2b7ce
LP		 621 * we avoid NSS lookups for gid=0. */
622
623 if (context->group || username) {
624
625 if (context->group)
626 if ((r = get_group_creds(context->group, &gid)) < 0)
627 return r;
628
629 /* First step, initialize groups from /etc/groups */
630 if (username && gid != 0) {
631 if (initgroups(username, gid) < 0)
632 return -errno;
633
634 keep_groups = true;
635 }
636
637 /* Second step, set our gids */
638 if (setresgid(gid, gid, gid) < 0)
639 return -errno;
640 }
641
642 if (context->supplementary_groups) {
643 int ngroups_max, k;
644 gid_t *gids;
645 char **i;
646
647 /* Final step, initialize any manually set supplementary groups */
648 ngroups_max = (int) sysconf(_SC_NGROUPS_MAX);
649
650 if (!(gids = new(gid_t, ngroups_max)))
651 return -ENOMEM;
652
653 if (keep_groups) {
654 if ((k = getgroups(ngroups_max, gids)) < 0) {
655 free(gids);
656 return -errno;
657 }
658 } else
659 k = 0;
660
661 STRV_FOREACH(i, context->supplementary_groups) {
662
663 if (k >= ngroups_max) {
664 free(gids);
665 return -E2BIG;
666 }
667
668 if ((r = get_group_creds(*i, gids+k)) < 0) {
669 free(gids);
670 return r;
671 }
672
673 k++;
674 }
675
676 if (setgroups(k, gids) < 0) {
677 free(gids);
678 return -errno;
679 }
680
681 free(gids);
682 }
683
684 return 0;
685}
686
687static int enforce_user(const ExecContext *context, uid_t uid) {
688 int r;
689 assert(context);
690
691 /* Sets (but doesn't lookup) the uid and make sure we keep the
692 * capabilities while doing so. */
693
694 if (context->capabilities) {
695 cap_t d;
696 static const cap_value_t bits[] = {
697 CAP_SETUID, /* Necessary so that we can run setresuid() below */
698 CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */
699 };
700
701 /* First step: If we need to keep capabilities but
702 * drop privileges we need to make sure we keep our
35b8ca3a 703 * caps, whiel we drop privileges. */
693ced48
LP		 704 if (uid != 0) {
705 int sb = context->secure_bits|SECURE_KEEP_CAPS;
706
707 if (prctl(PR_GET_SECUREBITS) != sb)
708 if (prctl(PR_SET_SECUREBITS, sb) < 0)
709 return -errno;
710 }
81a2b7ce 711
35b8ca3a 712 /* Second step: set the capabilities. This will reduce
81a2b7ce
LP		 713 * the capabilities to the minimum we need. */
714
715 if (!(d = cap_dup(context->capabilities)))
716 return -errno;
717
718 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
719 cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) {
720 r = -errno;
721 cap_free(d);
722 return r;
723 }
724
725 if (cap_set_proc(d) < 0) {
726 r = -errno;
727 cap_free(d);
728 return r;
729 }
730
731 cap_free(d);
732 }
733
734 /* Third step: actually set the uids */
735 if (setresuid(uid, uid, uid) < 0)
736 return -errno;
737
738 /* At this point we should have all necessary capabilities but
739 are otherwise a normal user. However, the caps might got
740 corrupted due to the setresuid() so we need clean them up
741 later. This is done outside of this call. */
742
743 return 0;
744}
745
5b6319dc
LP		 746#ifdef HAVE_PAM
747
748static int null_conv(
749 int num_msg,
750 const struct pam_message **msg,
751 struct pam_response **resp,
752 void *appdata_ptr) {
753
754 /* We don't support conversations */
755
756 return PAM_CONV_ERR;
757}
758
759static int setup_pam(
760 const char *name,
761 const char *user,
762 const char *tty,
763 char ***pam_env,
764 int fds[], unsigned n_fds) {
765
766 static const struct pam_conv conv = {
767 .conv = null_conv,
768 .appdata_ptr = NULL
769 };
770
771 pam_handle_t *handle = NULL;
772 sigset_t ss, old_ss;
773 int pam_code = PAM_SUCCESS;
774 char **e = NULL;
775 bool close_session = false;
776 pid_t pam_pid = 0, parent_pid;
777
778 assert(name);
779 assert(user);
780 assert(pam_env);
781
782 /* We set up PAM in the parent process, then fork. The child
35b8ca3a 783 * will then stay around until killed via PR_GET_PDEATHSIG or
5b6319dc
LP		 784 * systemd via the cgroup logic. It will then remove the PAM
785 * session again. The parent process will exec() the actual
786 * daemon. We do things this way to ensure that the main PID
787 * of the daemon is the one we initially fork()ed. */
788
789 if ((pam_code = pam_start(name, user, &conv, &handle)) != PAM_SUCCESS) {
790 handle = NULL;
791 goto fail;
792 }
793
794 if (tty)
795 if ((pam_code = pam_set_item(handle, PAM_TTY, tty)) != PAM_SUCCESS)
796 goto fail;
797
798 if ((pam_code = pam_acct_mgmt(handle, PAM_SILENT)) != PAM_SUCCESS)
799 goto fail;
800
801 if ((pam_code = pam_open_session(handle, PAM_SILENT)) != PAM_SUCCESS)
802 goto fail;
803
804 close_session = true;
805
806 if ((pam_code = pam_setcred(handle, PAM_ESTABLISH_CRED | PAM_SILENT)) != PAM_SUCCESS)
807 goto fail;
808
809 if ((!(e = pam_getenvlist(handle)))) {
810 pam_code = PAM_BUF_ERR;
811 goto fail;
812 }
813
814 /* Block SIGTERM, so that we know that it won't get lost in
815 * the child */
816 if (sigemptyset(&ss) < 0 ||
817 sigaddset(&ss, SIGTERM) < 0 ||
818 sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0)
819 goto fail;
820
821 parent_pid = getpid();
822
823 if ((pam_pid = fork()) < 0)
824 goto fail;
825
826 if (pam_pid == 0) {
827 int sig;
828 int r = EXIT_PAM;
829
830 /* The child's job is to reset the PAM session on
831 * termination */
832
833 /* This string must fit in 10 chars (i.e. the length
834 * of "/sbin/init") */
835 rename_process("sd:pam");
836
837 /* Make sure we don't keep open the passed fds in this
838 child. We assume that otherwise only those fds are
839 open here that have been opened by PAM. */
840 close_many(fds, n_fds);
841
842 /* Wait until our parent died. This will most likely
843 * not work since the kernel does not allow
35b8ca3a 844 * unprivileged parents kill their privileged children
5b6319dc
LP		 845 * this way. We rely on the control groups kill logic
846 * to do the rest for us. */
847 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
848 goto child_finish;
849
850 /* Check if our parent process might already have
851 * died? */
852 if (getppid() == parent_pid) {
853 if (sigwait(&ss, &sig) < 0)
854 goto child_finish;
855
856 assert(sig == SIGTERM);
857 }
858
859 /* Only if our parent died we'll end the session */
860 if (getppid() != parent_pid)
861 if ((pam_code = pam_close_session(handle, PAM_DATA_SILENT)) != PAM_SUCCESS)
862 goto child_finish;
863
864 r = 0;
865
866 child_finish:
867 pam_end(handle, pam_code | PAM_DATA_SILENT);
868 _exit(r);
869 }
870
871 /* If the child was forked off successfully it will do all the
872 * cleanups, so forget about the handle here. */
873 handle = NULL;
874
875 /* Unblock SIGSUR1 again in the parent */
876 if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0)
877 goto fail;
878
879 /* We close the log explicitly here, since the PAM modules
880 * might have opened it, but we don't want this fd around. */
881 closelog();
882
883 return 0;
884
885fail:
886 if (handle) {
887 if (close_session)
888 pam_code = pam_close_session(handle, PAM_DATA_SILENT);
889
890 pam_end(handle, pam_code | PAM_DATA_SILENT);
891 }
892
893 strv_free(e);
894
895 closelog();
896
897 if (pam_pid > 1)
898 kill(pam_pid, SIGTERM);
899
900 return EXIT_PAM;
901}
902#endif
903
9fb86720 904int exec_spawn(ExecCommand *command,
9e2f7c11 905 char **argv,
81a2b7ce 906 const ExecContext *context,
c2748801 907 int fds[], unsigned n_fds,
1137a57c 908 char **environment,
81a2b7ce
LP		 909 bool apply_permissions,
910 bool apply_chroot,
1e3ad081 911 bool apply_tty_stdin,
80876c20 912 bool confirm_spawn,
8e274523 913 CGroupBonding *cgroup_bondings,
81a2b7ce
LP		 914 pid_t *ret) {
915
034c6ed7 916 pid_t pid;
8e274523 917 int r;
1a63a750 918 char *line;
4f2d528d 919 int socket_fd;
034c6ed7 920
5cb5a6ff
LP		 921 assert(command);
922 assert(context);
923 assert(ret);
034c6ed7
LP		 924 assert(fds || n_fds <= 0);
925
4f2d528d
LP		 926 if (context->std_input == EXEC_INPUT_SOCKET ||
927 context->std_output == EXEC_OUTPUT_SOCKET ||
928 context->std_error == EXEC_OUTPUT_SOCKET) {
929
930 if (n_fds != 1)
931 return -EINVAL;
932
933 socket_fd = fds[0];
934
935 fds = NULL;
936 n_fds = 0;
937 } else
938 socket_fd = -1;
939
9e2f7c11
LP		 940 if (!argv)
941 argv = command->argv;
942
943 if (!(line = exec_command_line(argv)))
1a63a750
LP		 944 return -ENOMEM;
945
946 log_debug("About to execute: %s", line);
947 free(line);
acbb0225 948
8e274523
LP		 949 if (cgroup_bondings)
950 if ((r = cgroup_bonding_realize_list(cgroup_bondings)))
951 return r;
952
034c6ed7
LP		 953 if ((pid = fork()) < 0)
954 return -errno;
955
956 if (pid == 0) {
8e274523 957 int i;
309bff19 958 sigset_t ss;
81a2b7ce
LP		 959 const char *username = NULL, *home = NULL;
960 uid_t uid = (uid_t) -1;
961 gid_t gid = (gid_t) -1;
fab56fc5 962 char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
81a2b7ce 963 unsigned n_env = 0;
80876c20
LP		 964 int saved_stdout = -1, saved_stdin = -1;
965 bool keep_stdout = false, keep_stdin = false;
309bff19 966
034c6ed7 967 /* child */
5cb5a6ff 968
5b6319dc
LP		 969 /* This string must fit in 10 chars (i.e. the length
970 * of "/sbin/init") */
971 rename_process("sd:exec");
972
1b91d3e8
LP		 973 /* We reset exactly these signals, since they are the
974 * only ones we set to SIG_IGN in the main daemon. All
975 * others we leave untouched because we set them to
976 * SIG_DFL or a valid handler initially, both of which
977 * will be demoted to SIG_DFL. */
978 default_signals(SIGNALS_CRASH_HANDLER,
9a34ec5f 979 SIGNALS_IGNORE, -1);
7b683879 980
309bff19
LP		 981 if (sigemptyset(&ss) < 0 ||
982 sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
983 r = EXIT_SIGNAL_MASK;
984 goto fail;
985 }
986
85d73053
LP		 987 /* Close sockets very early to make sure we don't
988 * block init reexecution because it cannot bind its
989 * sockets */
73883adc
LP		 990 if (close_all_fds(socket_fd >= 0 ? &socket_fd : fds,
991 socket_fd >= 0 ? 1 : n_fds) < 0) {
fc9b2a84
LP		 992 r = EXIT_FDS;
993 goto fail;
994 }
995
74922904 996 if (!context->same_pgrp)
8d567588
LP		 997 if (setsid() < 0) {
998 r = EXIT_SETSID;
999 goto fail;
1000 }
80876c20 1001
c5da34ef
LP		 1002 if (context->tcpwrap_name) {
1003 if (socket_fd >= 0)
1004 if (!socket_tcpwrap(socket_fd, context->tcpwrap_name)) {
1005 r = EXIT_TCPWRAP;
1006 goto fail;
1007 }
1008
1009 for (i = 0; i < (int) n_fds; i++) {
1010 if (!socket_tcpwrap(fds[i], context->tcpwrap_name)) {
1011 r = EXIT_TCPWRAP;
1012 goto fail;
1013 }
df1f0afe 1014 }
c5da34ef 1015 }
df1f0afe 1016
1e3ad081
LP		 1017 /* We skip the confirmation step if we shall not apply the TTY */
1018 if (confirm_spawn &&
1019 (!is_terminal_input(context->std_input) || apply_tty_stdin)) {
80876c20
LP		 1020 char response;
1021
1022 /* Set up terminal for the question */
1023 if ((r = setup_confirm_stdio(context,
1024 &saved_stdin, &saved_stdout)))
1025 goto fail;
1026
1027 /* Now ask the question. */
9e2f7c11 1028 if (!(line = exec_command_line(argv))) {
80876c20 1029 r = EXIT_MEMORY;
ee2b4894
LP		 1030 goto fail;
1031 }
80876c20
LP		 1032
1033 r = ask(&response, "yns", "Execute %s? [Yes, No, Skip] ", line);
1034 free(line);
1035
1036 if (r < 0 || response == 'n') {
1037 r = EXIT_CONFIRM;
1038 goto fail;
1039 } else if (response == 's') {
1040 r = 0;
ee2b4894
LP		 1041 goto fail;
1042 }
80876c20
LP		 1043
1044 /* Release terminal for the question */
2608882f 1045 if ((r = restore_confirm_stdio(context,
80876c20
LP		 1046 &saved_stdin, &saved_stdout,
1047 &keep_stdin, &keep_stdout)))
1048 goto fail;
034c6ed7
LP		 1049 }
1050
da726a4d
LP		 1051 /* If a socket is connected to STDIN/STDOUT/STDERR, we
1052 * must sure to drop O_NONBLOCK */
1053 if (socket_fd >= 0)
1054 fd_nonblock(socket_fd, false);
1055
80876c20 1056 if (!keep_stdin)
1e3ad081 1057 if (setup_input(context, socket_fd, apply_tty_stdin) < 0) {
80876c20
LP		 1058 r = EXIT_STDIN;
1059 goto fail;
1060 }
9eba9da4 1061
80876c20 1062 if (!keep_stdout)
1e3ad081 1063 if (setup_output(context, socket_fd, file_name_from_path(command->path), apply_tty_stdin) < 0) {
80876c20
LP		 1064 r = EXIT_STDOUT;
1065 goto fail;
1066 }
94f04347 1067
1e3ad081 1068 if (setup_error(context, socket_fd, file_name_from_path(command->path), apply_tty_stdin) < 0) {
80876c20 1069 r = EXIT_STDERR;
071830ff
LP		 1070 goto fail;
1071 }
1072
8e274523 1073 if (cgroup_bondings)
e364ad06 1074 if (cgroup_bonding_install_list(cgroup_bondings, 0) < 0) {
8e274523
LP		 1075 r = EXIT_CGROUP;
1076 goto fail;
1077 }
1078
dd6c17b1 1079 if (context->oom_score_adjust_set) {
fb33a393 1080 char t[16];
034c6ed7 1081
dd6c17b1 1082 snprintf(t, sizeof(t), "%i", context->oom_score_adjust);
fb33a393 1083 char_array_0(t);
034c6ed7 1084
dd6c17b1
LP		 1085 if (write_one_line_file("/proc/self/oom_score_adj", t) < 0) {
1086 /* Compatibility with Linux <= 2.6.35 */
1087
1088 int adj;
1089
1090 adj = (context->oom_score_adjust * -OOM_DISABLE) / OOM_SCORE_ADJ_MAX;
1091 adj = CLAMP(adj, OOM_DISABLE, OOM_ADJUST_MAX);
1092
1093 snprintf(t, sizeof(t), "%i", adj);
1094 char_array_0(t);
1095
1096 if (write_one_line_file("/proc/self/oom_adj", t) < 0) {
1097 r = EXIT_OOM_ADJUST;
1098 goto fail;
1099 }
fb33a393 1100 }
034c6ed7
LP		 1101 }
1102
fb33a393
LP		 1103 if (context->nice_set)
1104 if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
1105 r = EXIT_NICE;
1106 goto fail;
1107 }
1108
94f04347
LP		 1109 if (context->cpu_sched_set) {
1110 struct sched_param param;
1111
1112 zero(param);
1113 param.sched_priority = context->cpu_sched_priority;
1114
38b48754
LP		 1115 if (sched_setscheduler(0, context->cpu_sched_policy |
1116 (context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), &param) < 0) {
94f04347
LP		 1117 r = EXIT_SETSCHEDULER;
1118 goto fail;
1119 }
1120 }
1121
82c121a4
LP		 1122 if (context->cpuset)
1123 if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
94f04347
LP		 1124 r = EXIT_CPUAFFINITY;
1125 goto fail;
1126 }
1127
9eba9da4
LP		 1128 if (context->ioprio_set)
1129 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
1130 r = EXIT_IOPRIO;
1131 goto fail;
1132 }
1133
03fae018
LP		 1134 if (context->timer_slack_nsec_set)
1135 if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
94f04347
LP		 1136 r = EXIT_TIMERSLACK;
1137 goto fail;
1138 }
1139
169c1bda
LP		 1140 if (context->utmp_id)
1141 utmp_put_init_process(0, context->utmp_id, getpid(), getsid(0), context->tty_path);
1142
81a2b7ce
LP		 1143 if (context->user) {
1144 username = context->user;
1145 if (get_user_creds(&username, &uid, &gid, &home) < 0) {
1146 r = EXIT_USER;
1147 goto fail;
1148 }
d8b4e2e9
LP		 1149
1150 if (is_terminal_input(context->std_input))
1151 if (chown_terminal(STDIN_FILENO, uid) < 0) {
1152 r = EXIT_STDIN;
1153 goto fail;
1154 }
81a2b7ce
LP		 1155 }
1156
5b6319dc
LP		 1157#ifdef HAVE_PAM
1158 if (context->pam_name && username) {
5b6319dc
LP		 1159 if (setup_pam(context->pam_name, username, context->tty_path, &pam_env, fds, n_fds) < 0) {
1160 r = EXIT_PAM;
1161 goto fail;
1162 }
1163 }
1164#endif
1165
81a2b7ce
LP		 1166 if (apply_permissions)
1167 if (enforce_groups(context, username, uid) < 0) {
1168 r = EXIT_GROUP;
1169 goto fail;
1170 }
1171
15ae422b
LP		 1172 umask(context->umask);
1173
04aa0cb9
LP		 1174 if (strv_length(context->read_write_dirs) > 0 ||
1175 strv_length(context->read_only_dirs) > 0 ||
1176 strv_length(context->inaccessible_dirs) > 0 ||
1177 context->mount_flags != MS_SHARED ||
1178 context->private_tmp)
1179 if ((r = setup_namespace(
1180 context->read_write_dirs,
1181 context->read_only_dirs,
1182 context->inaccessible_dirs,
1183 context->private_tmp,
1184 context->mount_flags)) < 0)
1185 goto fail;
1186
81a2b7ce
LP		 1187 if (apply_chroot) {
1188 if (context->root_directory)
1189 if (chroot(context->root_directory) < 0) {
1190 r = EXIT_CHROOT;
1191 goto fail;
1192 }
1193
1194 if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
1195 r = EXIT_CHDIR;
1196 goto fail;
1197 }
1198 } else {
1199
1200 char *d;
1201
1202 if (asprintf(&d, "%s/%s",
1203 context->root_directory ? context->root_directory : "",
1204 context->working_directory ? context->working_directory : "") < 0) {
1205 r = EXIT_MEMORY;
1206 goto fail;
1207 }
1208
1209 if (chdir(d) < 0) {
1210 free(d);
1211 r = EXIT_CHDIR;
1212 goto fail;
1213 }
1214
1215 free(d);
1216 }
1217
fc9b2a84
LP		 1218 /* We repeat the fd closing here, to make sure that
1219 * nothing is leaked from the PAM modules */
a0d40ac5 1220 if (close_all_fds(fds, n_fds) < 0 ||
47a71eed 1221 shift_fds(fds, n_fds) < 0 ||
451a074f 1222 flags_fds(fds, n_fds, context->non_blocking) < 0) {
034c6ed7
LP		 1223 r = EXIT_FDS;
1224 goto fail;
1225 }
1226
81a2b7ce 1227 if (apply_permissions) {
034c6ed7 1228
81a2b7ce
LP		 1229 for (i = 0; i < RLIMIT_NLIMITS; i++) {
1230 if (!context->rlimit[i])
1231 continue;
1232
1233 if (setrlimit(i, context->rlimit[i]) < 0) {
1234 r = EXIT_LIMITS;
1235 goto fail;
1236 }
034c6ed7 1237 }
034c6ed7 1238
81a2b7ce
LP		 1239 if (context->user)
1240 if (enforce_user(context, uid) < 0) {
1241 r = EXIT_USER;
1242 goto fail;
1243 }
1244
35b8ca3a 1245 /* PR_GET_SECUREBITS is not privileged, while
693ced48
LP		 1246 * PR_SET_SECUREBITS is. So to suppress
1247 * potential EPERMs we'll try not to call
1248 * PR_SET_SECUREBITS unless necessary. */
1249 if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
1250 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
1251 r = EXIT_SECUREBITS;
1252 goto fail;
1253 }
81a2b7ce
LP		 1254
1255 if (context->capabilities)
1256 if (cap_set_proc(context->capabilities) < 0) {
1257 r = EXIT_CAPABILITIES;
1258 goto fail;
1259 }
94f04347
LP		 1260 }
1261
e3aa71c3 1262 if (!(our_env = new0(char*, 7))) {
81a2b7ce
LP		 1263 r = EXIT_MEMORY;
1264 goto fail;
1265 }
034c6ed7 1266
81a2b7ce 1267 if (n_fds > 0)
bb00e604 1268 if (asprintf(our_env + n_env++, "LISTEN_PID=%lu", (unsigned long) getpid()) < 0 ||
81a2b7ce
LP		 1269 asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0) {
1270 r = EXIT_MEMORY;
1271 goto fail;
1272 }
034c6ed7 1273
81a2b7ce
LP		 1274 if (home)
1275 if (asprintf(our_env + n_env++, "HOME=%s", home) < 0) {
1276 r = EXIT_MEMORY;
1277 goto fail;
1278 }
034c6ed7 1279
81a2b7ce
LP		 1280 if (username)
1281 if (asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 ||
1282 asprintf(our_env + n_env++, "USER=%s", username) < 0) {
1283 r = EXIT_MEMORY;
1284 goto fail;
1285 }
034c6ed7 1286
e3aa71c3
LP		 1287 if (is_terminal_input(context->std_input) ||
1288 context->std_output == EXEC_OUTPUT_TTY ||
1289 context->std_error == EXEC_OUTPUT_TTY)
1290 if (!(our_env[n_env++] = strdup(default_term_for_tty(tty_path(context))))) {
1291 r = EXIT_MEMORY;
1292 goto fail;
1293 }
1294
1295 assert(n_env <= 7);
4e85aff4 1296
5b6319dc
LP		 1297 if (!(final_env = strv_env_merge(
1298 4,
1299 environment,
1300 our_env,
1301 context->environment,
1302 pam_env,
1303 NULL))) {
81a2b7ce
LP		 1304 r = EXIT_MEMORY;
1305 goto fail;
1306 }
034c6ed7 1307
fab56fc5
LP		 1308 if (!(final_argv = replace_env_argv(argv, final_env))) {
1309 r = EXIT_MEMORY;
1310 goto fail;
1311 }
1312
a6ff950e
LP		 1313 final_env = strv_env_clean(final_env);
1314
fab56fc5 1315 execve(command->path, final_argv, final_env);
034c6ed7
LP		 1316 r = EXIT_EXEC;
1317
1318 fail:
81a2b7ce
LP		 1319 strv_free(our_env);
1320 strv_free(final_env);
5b6319dc 1321 strv_free(pam_env);
fab56fc5 1322 strv_free(final_argv);
81a2b7ce 1323
80876c20
LP		 1324 if (saved_stdin >= 0)
1325 close_nointr_nofail(saved_stdin);
1326
1327 if (saved_stdout >= 0)
1328 close_nointr_nofail(saved_stdout);
1329
034c6ed7
LP		 1330 _exit(r);
1331 }
1332
80876c20
LP		 1333 /* We add the new process to the cgroup both in the child (so
1334 * that we can be sure that no user code is ever executed
1335 * outside of the cgroup) and in the parent (so that we can be
1336 * sure that when we kill the cgroup the process will be
1337 * killed too). */
1338 if (cgroup_bondings)
4e85aff4 1339 cgroup_bonding_install_list(cgroup_bondings, pid);
2da3263a 1340
bb00e604 1341 log_debug("Forked %s as %lu", command->path, (unsigned long) pid);
2da3263a 1342
b58b4116 1343 exec_status_start(&command->exec_status, pid);
9fb86720 1344
034c6ed7 1345 *ret = pid;
5cb5a6ff
LP		 1346 return 0;
1347}
1348
034c6ed7
LP		 1349void exec_context_init(ExecContext *c) {
1350 assert(c);
1351
1352 c->umask = 0002;
9eba9da4 1353 c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
94f04347 1354 c->cpu_sched_policy = SCHED_OTHER;
071830ff 1355 c->syslog_priority = LOG_DAEMON|LOG_INFO;
74922904 1356 c->syslog_level_prefix = true;
15ae422b 1357 c->mount_flags = MS_SHARED;
2e22afe9 1358 c->kill_signal = SIGTERM;
ba035df2 1359 c->send_sigkill = true;
034c6ed7
LP		 1360}
1361
1362void exec_context_done(ExecContext *c) {
5cb5a6ff
LP		 1363 unsigned l;
1364
1365 assert(c);
1366
1367 strv_free(c->environment);
034c6ed7 1368 c->environment = NULL;
5cb5a6ff 1369
034c6ed7 1370 for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
5cb5a6ff 1371 free(c->rlimit[l]);
034c6ed7
LP		 1372 c->rlimit[l] = NULL;
1373 }
1374
9eba9da4
LP		 1375 free(c->working_directory);
1376 c->working_directory = NULL;
1377 free(c->root_directory);
1378 c->root_directory = NULL;
5cb5a6ff 1379
80876c20
LP		 1380 free(c->tty_path);
1381 c->tty_path = NULL;
1382
df1f0afe
LP		 1383 free(c->tcpwrap_name);
1384 c->tcpwrap_name = NULL;
1385
071830ff
LP		 1386 free(c->syslog_identifier);
1387 c->syslog_identifier = NULL;
1388
5cb5a6ff 1389 free(c->user);
034c6ed7
LP		 1390 c->user = NULL;
1391
5cb5a6ff 1392 free(c->group);
034c6ed7
LP		 1393 c->group = NULL;
1394
1395 strv_free(c->supplementary_groups);
1396 c->supplementary_groups = NULL;
94f04347 1397
5b6319dc
LP		 1398 free(c->pam_name);
1399 c->pam_name = NULL;
1400
94f04347
LP		 1401 if (c->capabilities) {
1402 cap_free(c->capabilities);
1403 c->capabilities = NULL;
1404 }
15ae422b
LP		 1405
1406 strv_free(c->read_only_dirs);
1407 c->read_only_dirs = NULL;
1408
1409 strv_free(c->read_write_dirs);
1410 c->read_write_dirs = NULL;
1411
1412 strv_free(c->inaccessible_dirs);
1413 c->inaccessible_dirs = NULL;
82c121a4
LP		 1414
1415 if (c->cpuset)
1416 CPU_FREE(c->cpuset);
86a3475b
LP		 1417
1418 free(c->utmp_id);
1419 c->utmp_id = NULL;
5cb5a6ff
LP		 1420}
1421
43d0fcbd
LP		 1422void exec_command_done(ExecCommand *c) {
1423 assert(c);
1424
1425 free(c->path);
1426 c->path = NULL;
1427
1428 strv_free(c->argv);
1429 c->argv = NULL;
1430}
1431
1432void exec_command_done_array(ExecCommand *c, unsigned n) {
1433 unsigned i;
1434
1435 for (i = 0; i < n; i++)
1436 exec_command_done(c+i);
1437}
1438
5cb5a6ff
LP		 1439void exec_command_free_list(ExecCommand *c) {
1440 ExecCommand *i;
1441
1442 while ((i = c)) {
034c6ed7 1443 LIST_REMOVE(ExecCommand, command, c, i);
43d0fcbd 1444 exec_command_done(i);
5cb5a6ff
LP		 1445 free(i);
1446 }
1447}
1448
034c6ed7
LP		 1449void exec_command_free_array(ExecCommand **c, unsigned n) {
1450 unsigned i;
1451
1452 for (i = 0; i < n; i++) {
1453 exec_command_free_list(c[i]);
1454 c[i] = NULL;
1455 }
1456}
1457
15ae422b
LP		 1458static void strv_fprintf(FILE *f, char **l) {
1459 char **g;
1460
1461 assert(f);
1462
1463 STRV_FOREACH(g, l)
1464 fprintf(f, " %s", *g);
1465}
1466
5cb5a6ff 1467void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
94f04347
LP		 1468 char ** e;
1469 unsigned i;
9eba9da4 1470
5cb5a6ff
LP		 1471 assert(c);
1472 assert(f);
1473
1474 if (!prefix)
1475 prefix = "";
1476
1477 fprintf(f,
94f04347
LP		 1478 "%sUMask: %04o\n"
1479 "%sWorkingDirectory: %s\n"
451a074f 1480 "%sRootDirectory: %s\n"
15ae422b
LP		 1481 "%sNonBlocking: %s\n"
1482 "%sPrivateTmp: %s\n",
5cb5a6ff 1483 prefix, c->umask,
9eba9da4 1484 prefix, c->working_directory ? c->working_directory : "/",
451a074f 1485 prefix, c->root_directory ? c->root_directory : "/",
15ae422b
LP		 1486 prefix, yes_no(c->non_blocking),
1487 prefix, yes_no(c->private_tmp));
fb33a393 1488
94f04347
LP		 1489 if (c->environment)
1490 for (e = c->environment; *e; e++)
1491 fprintf(f, "%sEnvironment: %s\n", prefix, *e);
1492
df1f0afe
LP		 1493 if (c->tcpwrap_name)
1494 fprintf(f,
1495 "%sTCPWrapName: %s\n",
1496 prefix, c->tcpwrap_name);
1497
fb33a393
LP		 1498 if (c->nice_set)
1499 fprintf(f,
1500 "%sNice: %i\n",
1501 prefix, c->nice);
1502
dd6c17b1 1503 if (c->oom_score_adjust_set)
fb33a393 1504 fprintf(f,
dd6c17b1
LP		 1505 "%sOOMScoreAdjust: %i\n",
1506 prefix, c->oom_score_adjust);
9eba9da4 1507
94f04347
LP		 1508 for (i = 0; i < RLIM_NLIMITS; i++)
1509 if (c->rlimit[i])
ea430986 1510 fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
94f04347 1511
9eba9da4
LP		 1512 if (c->ioprio_set)
1513 fprintf(f,
1514 "%sIOSchedulingClass: %s\n"
1515 "%sIOPriority: %i\n",
94f04347 1516 prefix, ioprio_class_to_string(IOPRIO_PRIO_CLASS(c->ioprio)),
9eba9da4 1517 prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
94f04347
LP		 1518
1519 if (c->cpu_sched_set)
1520 fprintf(f,
1521 "%sCPUSchedulingPolicy: %s\n"
38b48754
LP		 1522 "%sCPUSchedulingPriority: %i\n"
1523 "%sCPUSchedulingResetOnFork: %s\n",
94f04347 1524 prefix, sched_policy_to_string(c->cpu_sched_policy),
38b48754
LP		 1525 prefix, c->cpu_sched_priority,
1526 prefix, yes_no(c->cpu_sched_reset_on_fork));
94f04347 1527
82c121a4 1528 if (c->cpuset) {
94f04347 1529 fprintf(f, "%sCPUAffinity:", prefix);
82c121a4
LP		 1530 for (i = 0; i < c->cpuset_ncpus; i++)
1531 if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset))
94f04347
LP		 1532 fprintf(f, " %i", i);
1533 fputs("\n", f);
1534 }
1535
03fae018
LP		 1536 if (c->timer_slack_nsec_set)
1537 fprintf(f, "%sTimerSlackNSec: %lu\n", prefix, c->timer_slack_nsec);
94f04347
LP		 1538
1539 fprintf(f,
80876c20
LP		 1540 "%sStandardInput: %s\n"
1541 "%sStandardOutput: %s\n"
1542 "%sStandardError: %s\n",
1543 prefix, exec_input_to_string(c->std_input),
1544 prefix, exec_output_to_string(c->std_output),
1545 prefix, exec_output_to_string(c->std_error));
1546
1547 if (c->tty_path)
1548 fprintf(f,
1549 "%sTTYPath: %s\n",
1550 prefix, c->tty_path);
94f04347 1551
9a6bca7a 1552 if (c->std_output == EXEC_OUTPUT_SYSLOG || c->std_output == EXEC_OUTPUT_KMSG ||
28dbc1e8
LP		 1553 c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
1554 c->std_error == EXEC_OUTPUT_SYSLOG || c->std_error == EXEC_OUTPUT_KMSG ||
1555 c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE)
94f04347
LP		 1556 fprintf(f,
1557 "%sSyslogFacility: %s\n"
1558 "%sSyslogLevel: %s\n",
1559 prefix, log_facility_to_string(LOG_FAC(c->syslog_priority)),
1560 prefix, log_level_to_string(LOG_PRI(c->syslog_priority)));
1561
1562 if (c->capabilities) {
1563 char *t;
1564 if ((t = cap_to_text(c->capabilities, NULL))) {
1565 fprintf(f, "%sCapabilities: %s\n",
1566 prefix, t);
1567 cap_free(t);
1568 }
1569 }
1570
1571 if (c->secure_bits)
1572 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
1573 prefix,
1574 (c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "",
1575 (c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
1576 (c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
1577 (c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
1578 (c->secure_bits & SECURE_NOROOT) ? " noroot" : "",
1579 (c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
1580
1581 if (c->capability_bounding_set_drop) {
1582 fprintf(f, "%sCapabilityBoundingSetDrop:", prefix);
1583
1584 for (i = 0; i <= CAP_LAST_CAP; i++)
1585 if (c->capability_bounding_set_drop & (1 << i)) {
1586 char *t;
1587
1588 if ((t = cap_to_name(i))) {
1589 fprintf(f, " %s", t);
1590 free(t);
1591 }
1592 }
1593
1594 fputs("\n", f);
1595 }
1596
1597 if (c->user)
f2d3769a 1598 fprintf(f, "%sUser: %s\n", prefix, c->user);
94f04347 1599 if (c->group)
f2d3769a 1600 fprintf(f, "%sGroup: %s\n", prefix, c->group);
94f04347 1601
15ae422b 1602 if (strv_length(c->supplementary_groups) > 0) {
94f04347 1603 fprintf(f, "%sSupplementaryGroups:", prefix);
15ae422b
LP		 1604 strv_fprintf(f, c->supplementary_groups);
1605 fputs("\n", f);
1606 }
94f04347 1607
5b6319dc 1608 if (c->pam_name)
f2d3769a 1609 fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name);
5b6319dc 1610
15ae422b
LP		 1611 if (strv_length(c->read_write_dirs) > 0) {
1612 fprintf(f, "%sReadWriteDirs:", prefix);
1613 strv_fprintf(f, c->read_write_dirs);
1614 fputs("\n", f);
1615 }
1616
1617 if (strv_length(c->read_only_dirs) > 0) {
1618 fprintf(f, "%sReadOnlyDirs:", prefix);
1619 strv_fprintf(f, c->read_only_dirs);
1620 fputs("\n", f);
1621 }
94f04347 1622
15ae422b
LP		 1623 if (strv_length(c->inaccessible_dirs) > 0) {
1624 fprintf(f, "%sInaccessibleDirs:", prefix);
1625 strv_fprintf(f, c->inaccessible_dirs);
94f04347
LP		 1626 fputs("\n", f);
1627 }
2e22afe9
LP		 1628
1629 fprintf(f,
1630 "%sKillMode: %s\n"
ba035df2
LP		 1631 "%sKillSignal: SIG%s\n"
1632 "%sSendSIGKILL: %s\n",
2e22afe9 1633 prefix, kill_mode_to_string(c->kill_mode),
ba035df2
LP		 1634 prefix, signal_to_string(c->kill_signal),
1635 prefix, yes_no(c->send_sigkill));
169c1bda
LP		 1636
1637 if (c->utmp_id)
1638 fprintf(f,
1639 "%sUtmpIdentifier: %s\n",
1640 prefix, c->utmp_id);
5cb5a6ff
LP		 1641}
1642
b58b4116 1643void exec_status_start(ExecStatus *s, pid_t pid) {
034c6ed7 1644 assert(s);
5cb5a6ff 1645
b58b4116
LP		 1646 zero(*s);
1647 s->pid = pid;
1648 dual_timestamp_get(&s->start_timestamp);
1649}
1650
169c1bda 1651void exec_status_exit(ExecStatus *s, pid_t pid, int code, int status, const char *utmp_id) {
b58b4116
LP		 1652 assert(s);
1653
1654 if ((s->pid && s->pid != pid) ||
1655 !s->start_timestamp.realtime <= 0)
1656 zero(*s);
1657
034c6ed7 1658 s->pid = pid;
63983207 1659 dual_timestamp_get(&s->exit_timestamp);
9fb86720 1660
034c6ed7
LP		 1661 s->code = code;
1662 s->status = status;
169c1bda
LP		 1663
1664 if (utmp_id)
1665 utmp_put_dead_process(utmp_id, pid, code, status);
9fb86720
LP		 1666}
1667
1668void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
1669 char buf[FORMAT_TIMESTAMP_MAX];
1670
1671 assert(s);
1672 assert(f);
1673
1674 if (!prefix)
1675 prefix = "";
1676
1677 if (s->pid <= 0)
1678 return;
1679
1680 fprintf(f,
bb00e604
LP		 1681 "%sPID: %lu\n",
1682 prefix, (unsigned long) s->pid);
9fb86720 1683
63983207 1684 if (s->start_timestamp.realtime > 0)
9fb86720
LP		 1685 fprintf(f,
1686 "%sStart Timestamp: %s\n",
63983207 1687 prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime));
9fb86720 1688
63983207 1689 if (s->exit_timestamp.realtime > 0)
9fb86720
LP		 1690 fprintf(f,
1691 "%sExit Timestamp: %s\n"
1692 "%sExit Code: %s\n"
1693 "%sExit Status: %i\n",
63983207 1694 prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime),
9fb86720
LP		 1695 prefix, sigchld_code_to_string(s->code),
1696 prefix, s->status);
5cb5a6ff 1697}
44d8db9e 1698
9e2f7c11 1699char *exec_command_line(char **argv) {
44d8db9e
LP		 1700 size_t k;
1701 char *n, *p, **a;
1702 bool first = true;
1703
9e2f7c11 1704 assert(argv);
44d8db9e 1705
9164977d 1706 k = 1;
9e2f7c11 1707 STRV_FOREACH(a, argv)
44d8db9e
LP		 1708 k += strlen(*a)+3;
1709
1710 if (!(n = new(char, k)))
1711 return NULL;
1712
1713 p = n;
9e2f7c11 1714 STRV_FOREACH(a, argv) {
44d8db9e
LP		 1715
1716 if (!first)
1717 *(p++) = ' ';
1718 else
1719 first = false;
1720
1721 if (strpbrk(*a, WHITESPACE)) {
1722 *(p++) = '\'';
1723 p = stpcpy(p, *a);
1724 *(p++) = '\'';
1725 } else
1726 p = stpcpy(p, *a);
1727
1728 }
1729
9164977d
LP		 1730 *p = 0;
1731
44d8db9e
LP		 1732 /* FIXME: this doesn't really handle arguments that have
1733 * spaces and ticks in them */
1734
1735 return n;
1736}
1737
1738void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
9fb86720
LP		 1739 char *p2;
1740 const char *prefix2;
1741
44d8db9e
LP		 1742 char *cmd;
1743
1744 assert(c);
1745 assert(f);
1746
1747 if (!prefix)
1748 prefix = "";
9fb86720
LP		 1749 p2 = strappend(prefix, "\t");
1750 prefix2 = p2 ? p2 : prefix;
44d8db9e 1751
9e2f7c11 1752 cmd = exec_command_line(c->argv);
44d8db9e
LP		 1753
1754 fprintf(f,
1755 "%sCommand Line: %s\n",
1756 prefix, cmd ? cmd : strerror(ENOMEM));
1757
1758 free(cmd);
9fb86720
LP		 1759
1760 exec_status_dump(&c->exec_status, f, prefix2);
1761
1762 free(p2);
44d8db9e
LP		 1763}
1764
1765void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
1766 assert(f);
1767
1768 if (!prefix)
1769 prefix = "";
1770
1771 LIST_FOREACH(command, c, c)
1772 exec_command_dump(c, f, prefix);
1773}
94f04347 1774
a6a80b4f
LP		 1775void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
1776 ExecCommand *end;
1777
1778 assert(l);
1779 assert(e);
1780
1781 if (*l) {
35b8ca3a 1782 /* It's kind of important, that we keep the order here */
a6a80b4f
LP		 1783 LIST_FIND_TAIL(ExecCommand, command, *l, end);
1784 LIST_INSERT_AFTER(ExecCommand, command, *l, end, e);
1785 } else
1786 *l = e;
1787}
1788
26fd040d
LP		 1789int exec_command_set(ExecCommand *c, const char *path, ...) {
1790 va_list ap;
1791 char **l, *p;
1792
1793 assert(c);
1794 assert(path);
1795
1796 va_start(ap, path);
1797 l = strv_new_ap(path, ap);
1798 va_end(ap);
1799
1800 if (!l)
1801 return -ENOMEM;
1802
1803 if (!(p = strdup(path))) {
1804 strv_free(l);
1805 return -ENOMEM;
1806 }
1807
1808 free(c->path);
1809 c->path = p;
1810
1811 strv_free(c->argv);
1812 c->argv = l;
1813
1814 return 0;
1815}
1816
80876c20
LP		 1817static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
1818 [EXEC_INPUT_NULL] = "null",
1819 [EXEC_INPUT_TTY] = "tty",
1820 [EXEC_INPUT_TTY_FORCE] = "tty-force",
4f2d528d
LP		 1821 [EXEC_INPUT_TTY_FAIL] = "tty-fail",
1822 [EXEC_INPUT_SOCKET] = "socket"
80876c20
LP		 1823};
1824
8a0867d6
LP		 1825DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
1826
94f04347 1827static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
80876c20 1828 [EXEC_OUTPUT_INHERIT] = "inherit",
94f04347 1829 [EXEC_OUTPUT_NULL] = "null",
80876c20 1830 [EXEC_OUTPUT_TTY] = "tty",
94f04347 1831 [EXEC_OUTPUT_SYSLOG] = "syslog",
28dbc1e8 1832 [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console",
9a6bca7a 1833 [EXEC_OUTPUT_KMSG] = "kmsg",
28dbc1e8 1834 [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console",
4f2d528d 1835 [EXEC_OUTPUT_SOCKET] = "socket"
94f04347
LP		 1836};
1837
1838DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
1839
8a0867d6
LP		 1840static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1841 [KILL_CONTROL_GROUP] = "control-group",
1842 [KILL_PROCESS_GROUP] = "process-group",
1843 [KILL_PROCESS] = "process",
1844 [KILL_NONE] = "none"
1845};
1846
1847DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);
1848
1849static const char* const kill_who_table[_KILL_WHO_MAX] = {
1850 [KILL_MAIN] = "main",
1851 [KILL_CONTROL] = "control",
1852 [KILL_ALL] = "all"
1853};
1854
1855DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);
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