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[thirdparty/systemd.git] / src / execute.c
CommitLineData
5cb5a6ff
LP		 1/*-*- Mode: C; c-basic-offset: 8 -*-*/
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>
5cb5a6ff 39
5b6319dc
LP		 40#ifdef HAVE_PAM
41#include <security/pam_appl.h>
42#endif
43
5cb5a6ff
LP		 44#include "execute.h"
45#include "strv.h"
46#include "macro.h"
47#include "util.h"
acbb0225 48#include "log.h"
9eba9da4 49#include "ioprio.h"
94f04347 50#include "securebits.h"
8e274523 51#include "cgroup.h"
15ae422b 52#include "namespace.h"
df1f0afe 53#include "tcpwrap.h"
5cb5a6ff 54
02a51aba
LP		 55/* This assumes there is a 'tty' group */
56#define TTY_MODE 0620
57
034c6ed7
LP		 58static int shift_fds(int fds[], unsigned n_fds) {
59 int start, restart_from;
60
61 if (n_fds <= 0)
62 return 0;
63
a0d40ac5
LP		 64 /* Modifies the fds array! (sorts it) */
65
034c6ed7
LP		 66 assert(fds);
67
68 start = 0;
69 for (;;) {
70 int i;
71
72 restart_from = -1;
73
74 for (i = start; i < (int) n_fds; i++) {
75 int nfd;
76
77 /* Already at right index? */
78 if (fds[i] == i+3)
79 continue;
80
81 if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
82 return -errno;
83
e1f5e051 84 close_nointr_nofail(fds[i]);
034c6ed7
LP		 85 fds[i] = nfd;
86
87 /* Hmm, the fd we wanted isn't free? Then
88 * let's remember that and try again from here*/
89 if (nfd != i+3 && restart_from < 0)
90 restart_from = i;
91 }
92
93 if (restart_from < 0)
94 break;
95
96 start = restart_from;
97 }
98
99 return 0;
100}
101
c2748801 102static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) {
47a71eed 103 unsigned i;
e2c76839 104 int r;
47a71eed
LP		 105
106 if (n_fds <= 0)
107 return 0;
108
109 assert(fds);
110
451a074f 111 /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
47a71eed
LP		 112
113 for (i = 0; i < n_fds; i++) {
47a71eed 114
e2c76839
LP		 115 if ((r = fd_nonblock(fds[i], nonblock)) < 0)
116 return r;
47a71eed 117
451a074f
LP		 118 /* We unconditionally drop FD_CLOEXEC from the fds,
119 * since after all we want to pass these fds to our
120 * children */
47a71eed 121
e2c76839
LP		 122 if ((r = fd_cloexec(fds[i], false)) < 0)
123 return r;
47a71eed
LP		 124 }
125
126 return 0;
127}
128
80876c20
LP		 129static const char *tty_path(const ExecContext *context) {
130 assert(context);
131
132 if (context->tty_path)
133 return context->tty_path;
134
135 return "/dev/console";
136}
137
138static int open_null_as(int flags, int nfd) {
139 int fd, r;
071830ff 140
80876c20 141 assert(nfd >= 0);
071830ff 142
80876c20 143 if ((fd = open("/dev/null", flags|O_NOCTTY)) < 0)
071830ff
LP		 144 return -errno;
145
80876c20
LP		 146 if (fd != nfd) {
147 r = dup2(fd, nfd) < 0 ? -errno : nfd;
e1f5e051 148 close_nointr_nofail(fd);
80876c20
LP		 149 } else
150 r = nfd;
071830ff 151
80876c20 152 return r;
071830ff
LP		 153}
154
80876c20
LP		 155static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, int nfd) {
156 int fd, r;
157 union {
158 struct sockaddr sa;
159 struct sockaddr_un un;
160 } sa;
071830ff
LP		 161
162 assert(context);
80876c20
LP		 163 assert(output < _EXEC_OUTPUT_MAX);
164 assert(ident);
165 assert(nfd >= 0);
071830ff 166
80876c20
LP		 167 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
168 return -errno;
071830ff 169
80876c20
LP		 170 zero(sa);
171 sa.sa.sa_family = AF_UNIX;
172 strncpy(sa.un.sun_path+1, LOGGER_SOCKET, sizeof(sa.un.sun_path)-1);
071830ff 173
80876c20
LP		 174 if (connect(fd, &sa.sa, sizeof(sa)) < 0) {
175 close_nointr_nofail(fd);
176 return -errno;
177 }
071830ff 178
80876c20
LP		 179 if (shutdown(fd, SHUT_RD) < 0) {
180 close_nointr_nofail(fd);
181 return -errno;
182 }
071830ff 183
80876c20
LP		 184 /* We speak a very simple protocol between log server
185 * and client: one line for the log destination (kmsg
186 * or syslog), followed by the priority field,
187 * followed by the process name. Since we replaced
188 * stdin/stderr we simple use stdio to write to
189 * it. Note that we use stderr, to minimize buffer
190 * flushing issues. */
191
192 dprintf(fd,
193 "%s\n"
194 "%i\n"
4f4a1dbf
LP		 195 "%s\n"
196 "%i\n",
9a6bca7a 197 output == EXEC_OUTPUT_KMSG ? "kmsg" : "syslog",
80876c20 198 context->syslog_priority,
4f4a1dbf
LP		 199 context->syslog_identifier ? context->syslog_identifier : ident,
200 !context->syslog_no_prefix);
80876c20
LP		 201
202 if (fd != nfd) {
203 r = dup2(fd, nfd) < 0 ? -errno : nfd;
e1f5e051 204 close_nointr_nofail(fd);
80876c20
LP		 205 } else
206 r = nfd;
071830ff 207
80876c20
LP		 208 return r;
209}
210static int open_terminal_as(const char *path, mode_t mode, int nfd) {
211 int fd, r;
071830ff 212
80876c20
LP		 213 assert(path);
214 assert(nfd >= 0);
071830ff 215
80876c20
LP		 216 if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
217 return fd;
071830ff 218
80876c20
LP		 219 if (fd != nfd) {
220 r = dup2(fd, nfd) < 0 ? -errno : nfd;
221 close_nointr_nofail(fd);
222 } else
223 r = nfd;
071830ff 224
80876c20
LP		 225 return r;
226}
071830ff 227
80876c20
LP		 228static bool is_terminal_input(ExecInput i) {
229 return
230 i == EXEC_INPUT_TTY ||
231 i == EXEC_INPUT_TTY_FORCE ||
232 i == EXEC_INPUT_TTY_FAIL;
233}
071830ff 234
03fd9c49 235static int fixup_input(ExecInput std_input, int socket_fd) {
071830ff 236
03fd9c49 237 if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 238 return EXEC_INPUT_NULL;
239
03fd9c49 240 return std_input;
4f2d528d
LP		 241}
242
03fd9c49 243static int fixup_output(ExecOutput std_output, int socket_fd) {
4f2d528d 244
03fd9c49 245 if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 246 return EXEC_OUTPUT_INHERIT;
247
03fd9c49 248 return std_output;
4f2d528d
LP		 249}
250
251static int setup_input(const ExecContext *context, int socket_fd) {
252 ExecInput i;
253
254 assert(context);
255
03fd9c49 256 i = fixup_input(context->std_input, socket_fd);
4f2d528d
LP		 257
258 switch (i) {
071830ff 259
80876c20
LP		 260 case EXEC_INPUT_NULL:
261 return open_null_as(O_RDONLY, STDIN_FILENO);
262
263 case EXEC_INPUT_TTY:
264 case EXEC_INPUT_TTY_FORCE:
265 case EXEC_INPUT_TTY_FAIL: {
266 int fd, r;
071830ff 267
80876c20
LP		 268 if ((fd = acquire_terminal(
269 tty_path(context),
4f2d528d 270 i == EXEC_INPUT_TTY_FAIL,
21de3988
LP		 271 i == EXEC_INPUT_TTY_FORCE,
272 false)) < 0)
80876c20
LP		 273 return fd;
274
275 if (fd != STDIN_FILENO) {
276 r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
071830ff 277 close_nointr_nofail(fd);
80876c20
LP		 278 } else
279 r = STDIN_FILENO;
280
281 return r;
282 }
283
4f2d528d
LP		 284 case EXEC_INPUT_SOCKET:
285 return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
286
80876c20
LP		 287 default:
288 assert_not_reached("Unknown input type");
289 }
290}
291
4f2d528d
LP		 292static int setup_output(const ExecContext *context, int socket_fd, const char *ident) {
293 ExecOutput o;
294 ExecInput i;
295
80876c20
LP		 296 assert(context);
297 assert(ident);
298
03fd9c49
LP		 299 i = fixup_input(context->std_input, socket_fd);
300 o = fixup_output(context->std_output, socket_fd);
4f2d528d 301
80876c20
LP		 302 /* This expects the input is already set up */
303
4f2d528d 304 switch (o) {
071830ff 305
80876c20
LP		 306 case EXEC_OUTPUT_INHERIT:
307
308 /* If the input is connected to a terminal, inherit that... */
ff876e28 309 if (i != EXEC_INPUT_NULL)
80876c20 310 return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
071830ff 311
ff876e28 312 /* For PID 1 stdout is always connected to /dev/null,
dec5d552
LP		 313 * hence reopen the console if out parent is PID1. */
314 if (getppid() == 1)
ff876e28
LP		 315 return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
316
317 return STDOUT_FILENO;
80876c20
LP		 318
319 case EXEC_OUTPUT_NULL:
320 return open_null_as(O_WRONLY, STDOUT_FILENO);
321
4f2d528d
LP		 322 case EXEC_OUTPUT_TTY:
323 if (is_terminal_input(i))
80876c20
LP		 324 return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
325
326 /* We don't reset the terminal if this is just about output */
327 return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
94f04347 328
80876c20 329 case EXEC_OUTPUT_SYSLOG:
9a6bca7a 330 case EXEC_OUTPUT_KMSG:
4f2d528d
LP		 331 return connect_logger_as(context, o, ident, STDOUT_FILENO);
332
333 case EXEC_OUTPUT_SOCKET:
334 assert(socket_fd >= 0);
335 return dup2(socket_fd, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
80876c20 336
94f04347
LP		 337 default:
338 assert_not_reached("Unknown output type");
071830ff 339 }
94f04347
LP		 340}
341
4f2d528d
LP		 342static int setup_error(const ExecContext *context, int socket_fd, const char *ident) {
343 ExecOutput o, e;
344 ExecInput i;
345
94f04347 346 assert(context);
02a51aba 347 assert(ident);
071830ff 348
03fd9c49
LP		 349 i = fixup_input(context->std_input, socket_fd);
350 o = fixup_output(context->std_output, socket_fd);
351 e = fixup_output(context->std_error, socket_fd);
4f2d528d 352
80876c20 353 /* This expects the input and output are already set up */
94f04347 354
80876c20
LP		 355 /* Don't change the stderr file descriptor if we inherit all
356 * the way and are not on a tty */
4f2d528d
LP		 357 if (e == EXEC_OUTPUT_INHERIT &&
358 o == EXEC_OUTPUT_INHERIT &&
ff876e28 359 i != EXEC_INPUT_NULL &&
dec5d552 360 getppid () != 1)
80876c20 361 return STDERR_FILENO;
94f04347 362
80876c20 363 /* Duplicate form stdout if possible */
4f2d528d 364 if (e == o || e == EXEC_OUTPUT_INHERIT)
80876c20 365 return dup2(STDOUT_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
94f04347 366
4f2d528d 367 switch (e) {
80876c20
LP		 368
369 case EXEC_OUTPUT_NULL:
370 return open_null_as(O_WRONLY, STDERR_FILENO);
371
372 case EXEC_OUTPUT_TTY:
4f2d528d 373 if (is_terminal_input(i))
80876c20
LP		 374 return dup2(STDIN_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
375
376 /* We don't reset the terminal if this is just about output */
377 return open_terminal_as(tty_path(context), O_WRONLY, STDERR_FILENO);
378
379 case EXEC_OUTPUT_SYSLOG:
9a6bca7a 380 case EXEC_OUTPUT_KMSG:
4f2d528d
LP		 381 return connect_logger_as(context, e, ident, STDERR_FILENO);
382
383 case EXEC_OUTPUT_SOCKET:
384 assert(socket_fd >= 0);
385 return dup2(socket_fd, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
94f04347
LP		 386
387 default:
80876c20 388 assert_not_reached("Unknown error type");
94f04347 389 }
071830ff
LP		 390}
391
02a51aba
LP		 392static int chown_terminal(int fd, uid_t uid) {
393 struct stat st;
394
395 assert(fd >= 0);
02a51aba
LP		 396
397 /* This might fail. What matters are the results. */
bab45044
LP		 398 (void) fchown(fd, uid, -1);
399 (void) fchmod(fd, TTY_MODE);
02a51aba
LP		 400
401 if (fstat(fd, &st) < 0)
402 return -errno;
403
d8b4e2e9 404 if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
02a51aba
LP		 405 return -EPERM;
406
407 return 0;
408}
409
80876c20
LP		 410static int setup_confirm_stdio(const ExecContext *context,
411 int *_saved_stdin,
412 int *_saved_stdout) {
413 int fd = -1, saved_stdin, saved_stdout = -1, r;
414
415 assert(context);
416 assert(_saved_stdin);
417 assert(_saved_stdout);
418
419 /* This returns positive EXIT_xxx return values instead of
420 * negative errno style values! */
421
422 if ((saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3)) < 0)
423 return EXIT_STDIN;
424
425 if ((saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3)) < 0) {
426 r = EXIT_STDOUT;
427 goto fail;
428 }
429
430 if ((fd = acquire_terminal(
431 tty_path(context),
432 context->std_input == EXEC_INPUT_TTY_FAIL,
21de3988
LP		 433 context->std_input == EXEC_INPUT_TTY_FORCE,
434 false)) < 0) {
80876c20
LP		 435 r = EXIT_STDIN;
436 goto fail;
437 }
438
02a51aba
LP		 439 if (chown_terminal(fd, getuid()) < 0) {
440 r = EXIT_STDIN;
441 goto fail;
442 }
443
80876c20
LP		 444 if (dup2(fd, STDIN_FILENO) < 0) {
445 r = EXIT_STDIN;
446 goto fail;
447 }
448
449 if (dup2(fd, STDOUT_FILENO) < 0) {
450 r = EXIT_STDOUT;
451 goto fail;
452 }
453
454 if (fd >= 2)
455 close_nointr_nofail(fd);
456
457 *_saved_stdin = saved_stdin;
458 *_saved_stdout = saved_stdout;
459
460 return 0;
461
462fail:
463 if (saved_stdout >= 0)
464 close_nointr_nofail(saved_stdout);
465
466 if (saved_stdin >= 0)
467 close_nointr_nofail(saved_stdin);
468
469 if (fd >= 0)
470 close_nointr_nofail(fd);
471
472 return r;
473}
474
2608882f 475static int restore_confirm_stdio(const ExecContext *context,
80876c20
LP		 476 int *saved_stdin,
477 int *saved_stdout,
478 bool *keep_stdin,
479 bool *keep_stdout) {
480
481 assert(context);
482 assert(saved_stdin);
483 assert(*saved_stdin >= 0);
484 assert(saved_stdout);
485 assert(*saved_stdout >= 0);
486
487 /* This returns positive EXIT_xxx return values instead of
488 * negative errno style values! */
489
490 if (is_terminal_input(context->std_input)) {
491
492 /* The service wants terminal input. */
493
494 *keep_stdin = true;
495 *keep_stdout =
496 context->std_output == EXEC_OUTPUT_INHERIT ||
497 context->std_output == EXEC_OUTPUT_TTY;
498
499 } else {
500 /* If the service doesn't want a controlling terminal,
501 * then we need to get rid entirely of what we have
502 * already. */
503
504 if (release_terminal() < 0)
505 return EXIT_STDIN;
506
507 if (dup2(*saved_stdin, STDIN_FILENO) < 0)
508 return EXIT_STDIN;
509
510 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
511 return EXIT_STDOUT;
512
513 *keep_stdout = *keep_stdin = false;
514 }
515
516 return 0;
517}
518
81a2b7ce
LP		 519static int get_group_creds(const char *groupname, gid_t *gid) {
520 struct group *g;
521 unsigned long lu;
522
523 assert(groupname);
524 assert(gid);
525
526 /* We enforce some special rules for gid=0: in order to avoid
527 * NSS lookups for root we hardcode its data. */
528
529 if (streq(groupname, "root") || streq(groupname, "0")) {
530 *gid = 0;
531 return 0;
532 }
533
534 if (safe_atolu(groupname, &lu) >= 0) {
535 errno = 0;
536 g = getgrgid((gid_t) lu);
537 } else {
538 errno = 0;
539 g = getgrnam(groupname);
540 }
541
542 if (!g)
543 return errno != 0 ? -errno : -ESRCH;
544
545 *gid = g->gr_gid;
546 return 0;
547}
548
549static int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) {
550 struct passwd *p;
551 unsigned long lu;
552
553 assert(username);
554 assert(*username);
555 assert(uid);
556 assert(gid);
557 assert(home);
558
559 /* We enforce some special rules for uid=0: in order to avoid
560 * NSS lookups for root we hardcode its data. */
561
562 if (streq(*username, "root") || streq(*username, "0")) {
563 *username = "root";
564 *uid = 0;
565 *gid = 0;
566 *home = "/root";
567 return 0;
568 }
569
570 if (safe_atolu(*username, &lu) >= 0) {
571 errno = 0;
572 p = getpwuid((uid_t) lu);
573
574 /* If there are multiple users with the same id, make
575 * sure to leave $USER to the configured value instead
576 * of the first occurence in the database. However if
577 * the uid was configured by a numeric uid, then let's
578 * pick the real username from /etc/passwd. */
579 if (*username && p)
580 *username = p->pw_name;
581 } else {
582 errno = 0;
583 p = getpwnam(*username);
584 }
585
586 if (!p)
587 return errno != 0 ? -errno : -ESRCH;
588
589 *uid = p->pw_uid;
590 *gid = p->pw_gid;
591 *home = p->pw_dir;
592 return 0;
593}
594
595static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
596 bool keep_groups = false;
597 int r;
598
599 assert(context);
600
601 /* Lookup and ser GID and supplementary group list. Here too
602 * we avoid NSS lookups for gid=0. */
603
604 if (context->group || username) {
605
606 if (context->group)
607 if ((r = get_group_creds(context->group, &gid)) < 0)
608 return r;
609
610 /* First step, initialize groups from /etc/groups */
611 if (username && gid != 0) {
612 if (initgroups(username, gid) < 0)
613 return -errno;
614
615 keep_groups = true;
616 }
617
618 /* Second step, set our gids */
619 if (setresgid(gid, gid, gid) < 0)
620 return -errno;
621 }
622
623 if (context->supplementary_groups) {
624 int ngroups_max, k;
625 gid_t *gids;
626 char **i;
627
628 /* Final step, initialize any manually set supplementary groups */
629 ngroups_max = (int) sysconf(_SC_NGROUPS_MAX);
630
631 if (!(gids = new(gid_t, ngroups_max)))
632 return -ENOMEM;
633
634 if (keep_groups) {
635 if ((k = getgroups(ngroups_max, gids)) < 0) {
636 free(gids);
637 return -errno;
638 }
639 } else
640 k = 0;
641
642 STRV_FOREACH(i, context->supplementary_groups) {
643
644 if (k >= ngroups_max) {
645 free(gids);
646 return -E2BIG;
647 }
648
649 if ((r = get_group_creds(*i, gids+k)) < 0) {
650 free(gids);
651 return r;
652 }
653
654 k++;
655 }
656
657 if (setgroups(k, gids) < 0) {
658 free(gids);
659 return -errno;
660 }
661
662 free(gids);
663 }
664
665 return 0;
666}
667
668static int enforce_user(const ExecContext *context, uid_t uid) {
669 int r;
670 assert(context);
671
672 /* Sets (but doesn't lookup) the uid and make sure we keep the
673 * capabilities while doing so. */
674
675 if (context->capabilities) {
676 cap_t d;
677 static const cap_value_t bits[] = {
678 CAP_SETUID, /* Necessary so that we can run setresuid() below */
679 CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */
680 };
681
682 /* First step: If we need to keep capabilities but
683 * drop privileges we need to make sure we keep our
684 * caps, whiel we drop priviliges. */
693ced48
LP		 685 if (uid != 0) {
686 int sb = context->secure_bits|SECURE_KEEP_CAPS;
687
688 if (prctl(PR_GET_SECUREBITS) != sb)
689 if (prctl(PR_SET_SECUREBITS, sb) < 0)
690 return -errno;
691 }
81a2b7ce
LP		 692
693 /* Second step: set the capabilites. This will reduce
694 * the capabilities to the minimum we need. */
695
696 if (!(d = cap_dup(context->capabilities)))
697 return -errno;
698
699 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
700 cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) {
701 r = -errno;
702 cap_free(d);
703 return r;
704 }
705
706 if (cap_set_proc(d) < 0) {
707 r = -errno;
708 cap_free(d);
709 return r;
710 }
711
712 cap_free(d);
713 }
714
715 /* Third step: actually set the uids */
716 if (setresuid(uid, uid, uid) < 0)
717 return -errno;
718
719 /* At this point we should have all necessary capabilities but
720 are otherwise a normal user. However, the caps might got
721 corrupted due to the setresuid() so we need clean them up
722 later. This is done outside of this call. */
723
724 return 0;
725}
726
5b6319dc
LP		 727#ifdef HAVE_PAM
728
729static int null_conv(
730 int num_msg,
731 const struct pam_message **msg,
732 struct pam_response **resp,
733 void *appdata_ptr) {
734
735 /* We don't support conversations */
736
737 return PAM_CONV_ERR;
738}
739
740static int setup_pam(
741 const char *name,
742 const char *user,
743 const char *tty,
744 char ***pam_env,
745 int fds[], unsigned n_fds) {
746
747 static const struct pam_conv conv = {
748 .conv = null_conv,
749 .appdata_ptr = NULL
750 };
751
752 pam_handle_t *handle = NULL;
753 sigset_t ss, old_ss;
754 int pam_code = PAM_SUCCESS;
755 char **e = NULL;
756 bool close_session = false;
757 pid_t pam_pid = 0, parent_pid;
758
759 assert(name);
760 assert(user);
761 assert(pam_env);
762
763 /* We set up PAM in the parent process, then fork. The child
764 * will then stay around untill killed via PR_GET_PDEATHSIG or
765 * systemd via the cgroup logic. It will then remove the PAM
766 * session again. The parent process will exec() the actual
767 * daemon. We do things this way to ensure that the main PID
768 * of the daemon is the one we initially fork()ed. */
769
770 if ((pam_code = pam_start(name, user, &conv, &handle)) != PAM_SUCCESS) {
771 handle = NULL;
772 goto fail;
773 }
774
775 if (tty)
776 if ((pam_code = pam_set_item(handle, PAM_TTY, tty)) != PAM_SUCCESS)
777 goto fail;
778
779 if ((pam_code = pam_acct_mgmt(handle, PAM_SILENT)) != PAM_SUCCESS)
780 goto fail;
781
782 if ((pam_code = pam_open_session(handle, PAM_SILENT)) != PAM_SUCCESS)
783 goto fail;
784
785 close_session = true;
786
787 if ((pam_code = pam_setcred(handle, PAM_ESTABLISH_CRED | PAM_SILENT)) != PAM_SUCCESS)
788 goto fail;
789
790 if ((!(e = pam_getenvlist(handle)))) {
791 pam_code = PAM_BUF_ERR;
792 goto fail;
793 }
794
795 /* Block SIGTERM, so that we know that it won't get lost in
796 * the child */
797 if (sigemptyset(&ss) < 0 ||
798 sigaddset(&ss, SIGTERM) < 0 ||
799 sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0)
800 goto fail;
801
802 parent_pid = getpid();
803
804 if ((pam_pid = fork()) < 0)
805 goto fail;
806
807 if (pam_pid == 0) {
808 int sig;
809 int r = EXIT_PAM;
810
811 /* The child's job is to reset the PAM session on
812 * termination */
813
814 /* This string must fit in 10 chars (i.e. the length
815 * of "/sbin/init") */
816 rename_process("sd:pam");
817
818 /* Make sure we don't keep open the passed fds in this
819 child. We assume that otherwise only those fds are
820 open here that have been opened by PAM. */
821 close_many(fds, n_fds);
822
823 /* Wait until our parent died. This will most likely
824 * not work since the kernel does not allow
825 * unpriviliged paretns kill their priviliged children
826 * this way. We rely on the control groups kill logic
827 * to do the rest for us. */
828 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
829 goto child_finish;
830
831 /* Check if our parent process might already have
832 * died? */
833 if (getppid() == parent_pid) {
834 if (sigwait(&ss, &sig) < 0)
835 goto child_finish;
836
837 assert(sig == SIGTERM);
838 }
839
840 /* Only if our parent died we'll end the session */
841 if (getppid() != parent_pid)
842 if ((pam_code = pam_close_session(handle, PAM_DATA_SILENT)) != PAM_SUCCESS)
843 goto child_finish;
844
845 r = 0;
846
847 child_finish:
848 pam_end(handle, pam_code | PAM_DATA_SILENT);
849 _exit(r);
850 }
851
852 /* If the child was forked off successfully it will do all the
853 * cleanups, so forget about the handle here. */
854 handle = NULL;
855
856 /* Unblock SIGSUR1 again in the parent */
857 if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0)
858 goto fail;
859
860 /* We close the log explicitly here, since the PAM modules
861 * might have opened it, but we don't want this fd around. */
862 closelog();
863
864 return 0;
865
866fail:
867 if (handle) {
868 if (close_session)
869 pam_code = pam_close_session(handle, PAM_DATA_SILENT);
870
871 pam_end(handle, pam_code | PAM_DATA_SILENT);
872 }
873
874 strv_free(e);
875
876 closelog();
877
878 if (pam_pid > 1)
879 kill(pam_pid, SIGTERM);
880
881 return EXIT_PAM;
882}
883#endif
884
9fb86720 885int exec_spawn(ExecCommand *command,
9e2f7c11 886 char **argv,
81a2b7ce 887 const ExecContext *context,
c2748801 888 int fds[], unsigned n_fds,
1137a57c 889 char **environment,
81a2b7ce
LP		 890 bool apply_permissions,
891 bool apply_chroot,
80876c20 892 bool confirm_spawn,
8e274523 893 CGroupBonding *cgroup_bondings,
81a2b7ce
LP		 894 pid_t *ret) {
895
034c6ed7 896 pid_t pid;
8e274523 897 int r;
1a63a750 898 char *line;
4f2d528d 899 int socket_fd;
034c6ed7 900
5cb5a6ff
LP		 901 assert(command);
902 assert(context);
903 assert(ret);
034c6ed7
LP		 904 assert(fds || n_fds <= 0);
905
4f2d528d
LP		 906 if (context->std_input == EXEC_INPUT_SOCKET ||
907 context->std_output == EXEC_OUTPUT_SOCKET ||
908 context->std_error == EXEC_OUTPUT_SOCKET) {
909
910 if (n_fds != 1)
911 return -EINVAL;
912
913 socket_fd = fds[0];
914
915 fds = NULL;
916 n_fds = 0;
917 } else
918 socket_fd = -1;
919
9e2f7c11
LP		 920 if (!argv)
921 argv = command->argv;
922
923 if (!(line = exec_command_line(argv)))
1a63a750
LP		 924 return -ENOMEM;
925
926 log_debug("About to execute: %s", line);
927 free(line);
acbb0225 928
8e274523
LP		 929 if (cgroup_bondings)
930 if ((r = cgroup_bonding_realize_list(cgroup_bondings)))
931 return r;
932
034c6ed7
LP		 933 if ((pid = fork()) < 0)
934 return -errno;
935
936 if (pid == 0) {
8e274523 937 int i;
309bff19 938 sigset_t ss;
81a2b7ce
LP		 939 const char *username = NULL, *home = NULL;
940 uid_t uid = (uid_t) -1;
941 gid_t gid = (gid_t) -1;
5b6319dc 942 char **our_env = NULL, **pam_env = NULL, **final_env = NULL;
81a2b7ce 943 unsigned n_env = 0;
80876c20
LP		 944 int saved_stdout = -1, saved_stdin = -1;
945 bool keep_stdout = false, keep_stdin = false;
309bff19 946
034c6ed7 947 /* child */
5cb5a6ff 948
5b6319dc
LP		 949 /* This string must fit in 10 chars (i.e. the length
950 * of "/sbin/init") */
951 rename_process("sd:exec");
952
1b91d3e8
LP		 953 /* We reset exactly these signals, since they are the
954 * only ones we set to SIG_IGN in the main daemon. All
955 * others we leave untouched because we set them to
956 * SIG_DFL or a valid handler initially, both of which
957 * will be demoted to SIG_DFL. */
958 default_signals(SIGNALS_CRASH_HANDLER,
9a34ec5f 959 SIGNALS_IGNORE, -1);
7b683879 960
309bff19
LP		 961 if (sigemptyset(&ss) < 0 ||
962 sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
963 r = EXIT_SIGNAL_MASK;
964 goto fail;
965 }
966
8d567588
LP		 967 if (!context->no_setsid)
968 if (setsid() < 0) {
969 r = EXIT_SETSID;
970 goto fail;
971 }
80876c20 972
df1f0afe
LP		 973 if (socket_fd >= 0 && context->tcpwrap_name)
974 if (!socket_tcpwrap(socket_fd, context->tcpwrap_name)) {
975 r = EXIT_TCPWRAP;
976 goto fail;
977 }
978
80876c20
LP		 979 if (confirm_spawn) {
980 char response;
981
982 /* Set up terminal for the question */
983 if ((r = setup_confirm_stdio(context,
984 &saved_stdin, &saved_stdout)))
985 goto fail;
986
987 /* Now ask the question. */
9e2f7c11 988 if (!(line = exec_command_line(argv))) {
80876c20 989 r = EXIT_MEMORY;
ee2b4894
LP		 990 goto fail;
991 }
80876c20
LP		 992
993 r = ask(&response, "yns", "Execute %s? [Yes, No, Skip] ", line);
994 free(line);
995
996 if (r < 0 || response == 'n') {
997 r = EXIT_CONFIRM;
998 goto fail;
999 } else if (response == 's') {
1000 r = 0;
ee2b4894
LP		 1001 goto fail;
1002 }
80876c20
LP		 1003
1004 /* Release terminal for the question */
2608882f 1005 if ((r = restore_confirm_stdio(context,
80876c20
LP		 1006 &saved_stdin, &saved_stdout,
1007 &keep_stdin, &keep_stdout)))
1008 goto fail;
034c6ed7
LP		 1009 }
1010
80876c20 1011 if (!keep_stdin)
4f2d528d 1012 if (setup_input(context, socket_fd) < 0) {
80876c20
LP		 1013 r = EXIT_STDIN;
1014 goto fail;
1015 }
9eba9da4 1016
80876c20 1017 if (!keep_stdout)
4f2d528d 1018 if (setup_output(context, socket_fd, file_name_from_path(command->path)) < 0) {
80876c20
LP		 1019 r = EXIT_STDOUT;
1020 goto fail;
1021 }
94f04347 1022
4f2d528d 1023 if (setup_error(context, socket_fd, file_name_from_path(command->path)) < 0) {
80876c20 1024 r = EXIT_STDERR;
071830ff
LP		 1025 goto fail;
1026 }
1027
8e274523
LP		 1028 if (cgroup_bondings)
1029 if ((r = cgroup_bonding_install_list(cgroup_bondings, 0)) < 0) {
1030 r = EXIT_CGROUP;
1031 goto fail;
1032 }
1033
fb33a393
LP		 1034 if (context->oom_adjust_set) {
1035 char t[16];
034c6ed7 1036
fb33a393
LP		 1037 snprintf(t, sizeof(t), "%i", context->oom_adjust);
1038 char_array_0(t);
034c6ed7 1039
fb33a393
LP		 1040 if (write_one_line_file("/proc/self/oom_adj", t) < 0) {
1041 r = EXIT_OOM_ADJUST;
1042 goto fail;
1043 }
034c6ed7
LP		 1044 }
1045
fb33a393
LP		 1046 if (context->nice_set)
1047 if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
1048 r = EXIT_NICE;
1049 goto fail;
1050 }
1051
94f04347
LP		 1052 if (context->cpu_sched_set) {
1053 struct sched_param param;
1054
1055 zero(param);
1056 param.sched_priority = context->cpu_sched_priority;
1057
38b48754
LP		 1058 if (sched_setscheduler(0, context->cpu_sched_policy |
1059 (context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), &param) < 0) {
94f04347
LP		 1060 r = EXIT_SETSCHEDULER;
1061 goto fail;
1062 }
1063 }
1064
1065 if (context->cpu_affinity_set)
1066 if (sched_setaffinity(0, sizeof(context->cpu_affinity), &context->cpu_affinity) < 0) {
1067 r = EXIT_CPUAFFINITY;
1068 goto fail;
1069 }
1070
9eba9da4
LP		 1071 if (context->ioprio_set)
1072 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
1073 r = EXIT_IOPRIO;
1074 goto fail;
1075 }
1076
94f04347
LP		 1077 if (context->timer_slack_ns_set)
1078 if (prctl(PR_SET_TIMERSLACK, context->timer_slack_ns_set) < 0) {
1079 r = EXIT_TIMERSLACK;
1080 goto fail;
1081 }
1082
81a2b7ce
LP		 1083 if (context->user) {
1084 username = context->user;
1085 if (get_user_creds(&username, &uid, &gid, &home) < 0) {
1086 r = EXIT_USER;
1087 goto fail;
1088 }
d8b4e2e9
LP		 1089
1090 if (is_terminal_input(context->std_input))
1091 if (chown_terminal(STDIN_FILENO, uid) < 0) {
1092 r = EXIT_STDIN;
1093 goto fail;
1094 }
81a2b7ce
LP		 1095 }
1096
5b6319dc
LP		 1097#ifdef HAVE_PAM
1098 if (context->pam_name && username) {
1099 /* Make sure no fds leak into the PAM
1100 * supervisor process. We will call this later
1101 * on again to make sure that any fds leaked
1102 * by the PAM modules get closed before our
1103 * exec(). */
1104 if (close_all_fds(fds, n_fds) < 0) {
1105 r = EXIT_FDS;
1106 goto fail;
1107 }
1108
1109 if (setup_pam(context->pam_name, username, context->tty_path, &pam_env, fds, n_fds) < 0) {
1110 r = EXIT_PAM;
1111 goto fail;
1112 }
1113 }
1114#endif
1115
81a2b7ce
LP		 1116 if (apply_permissions)
1117 if (enforce_groups(context, username, uid) < 0) {
1118 r = EXIT_GROUP;
1119 goto fail;
1120 }
1121
15ae422b
LP		 1122 umask(context->umask);
1123
04aa0cb9
LP		 1124 if (strv_length(context->read_write_dirs) > 0 ||
1125 strv_length(context->read_only_dirs) > 0 ||
1126 strv_length(context->inaccessible_dirs) > 0 ||
1127 context->mount_flags != MS_SHARED ||
1128 context->private_tmp)
1129 if ((r = setup_namespace(
1130 context->read_write_dirs,
1131 context->read_only_dirs,
1132 context->inaccessible_dirs,
1133 context->private_tmp,
1134 context->mount_flags)) < 0)
1135 goto fail;
1136
81a2b7ce
LP		 1137 if (apply_chroot) {
1138 if (context->root_directory)
1139 if (chroot(context->root_directory) < 0) {
1140 r = EXIT_CHROOT;
1141 goto fail;
1142 }
1143
1144 if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
1145 r = EXIT_CHDIR;
1146 goto fail;
1147 }
1148 } else {
1149
1150 char *d;
1151
1152 if (asprintf(&d, "%s/%s",
1153 context->root_directory ? context->root_directory : "",
1154 context->working_directory ? context->working_directory : "") < 0) {
1155 r = EXIT_MEMORY;
1156 goto fail;
1157 }
1158
1159 if (chdir(d) < 0) {
1160 free(d);
1161 r = EXIT_CHDIR;
1162 goto fail;
1163 }
1164
1165 free(d);
1166 }
1167
a0d40ac5 1168 if (close_all_fds(fds, n_fds) < 0 ||
47a71eed 1169 shift_fds(fds, n_fds) < 0 ||
451a074f 1170 flags_fds(fds, n_fds, context->non_blocking) < 0) {
034c6ed7
LP		 1171 r = EXIT_FDS;
1172 goto fail;
1173 }
1174
81a2b7ce 1175 if (apply_permissions) {
034c6ed7 1176
81a2b7ce
LP		 1177 for (i = 0; i < RLIMIT_NLIMITS; i++) {
1178 if (!context->rlimit[i])
1179 continue;
1180
1181 if (setrlimit(i, context->rlimit[i]) < 0) {
1182 r = EXIT_LIMITS;
1183 goto fail;
1184 }
034c6ed7 1185 }
034c6ed7 1186
81a2b7ce
LP		 1187 if (context->user)
1188 if (enforce_user(context, uid) < 0) {
1189 r = EXIT_USER;
1190 goto fail;
1191 }
1192
693ced48
LP		 1193 /* PR_GET_SECUREBITS is not priviliged, while
1194 * PR_SET_SECUREBITS is. So to suppress
1195 * potential EPERMs we'll try not to call
1196 * PR_SET_SECUREBITS unless necessary. */
1197 if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
1198 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
1199 r = EXIT_SECUREBITS;
1200 goto fail;
1201 }
81a2b7ce
LP		 1202
1203 if (context->capabilities)
1204 if (cap_set_proc(context->capabilities) < 0) {
1205 r = EXIT_CAPABILITIES;
1206 goto fail;
1207 }
94f04347
LP		 1208 }
1209
81a2b7ce
LP		 1210 if (!(our_env = new0(char*, 6))) {
1211 r = EXIT_MEMORY;
1212 goto fail;
1213 }
034c6ed7 1214
81a2b7ce
LP		 1215 if (n_fds > 0)
1216 if (asprintf(our_env + n_env++, "LISTEN_PID=%llu", (unsigned long long) getpid()) < 0 ||
1217 asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0) {
1218 r = EXIT_MEMORY;
1219 goto fail;
1220 }
034c6ed7 1221
81a2b7ce
LP		 1222 if (home)
1223 if (asprintf(our_env + n_env++, "HOME=%s", home) < 0) {
1224 r = EXIT_MEMORY;
1225 goto fail;
1226 }
034c6ed7 1227
81a2b7ce
LP		 1228 if (username)
1229 if (asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 ||
1230 asprintf(our_env + n_env++, "USER=%s", username) < 0) {
1231 r = EXIT_MEMORY;
1232 goto fail;
1233 }
034c6ed7 1234
4e85aff4
LP		 1235 assert(n_env <= 6);
1236
5b6319dc
LP		 1237 if (!(final_env = strv_env_merge(
1238 4,
1239 environment,
1240 our_env,
1241 context->environment,
1242 pam_env,
1243 NULL))) {
81a2b7ce
LP		 1244 r = EXIT_MEMORY;
1245 goto fail;
1246 }
034c6ed7 1247
9e2f7c11 1248 execve(command->path, argv, final_env);
034c6ed7
LP		 1249 r = EXIT_EXEC;
1250
1251 fail:
81a2b7ce
LP		 1252 strv_free(our_env);
1253 strv_free(final_env);
5b6319dc 1254 strv_free(pam_env);
81a2b7ce 1255
80876c20
LP		 1256 if (saved_stdin >= 0)
1257 close_nointr_nofail(saved_stdin);
1258
1259 if (saved_stdout >= 0)
1260 close_nointr_nofail(saved_stdout);
1261
034c6ed7
LP		 1262 _exit(r);
1263 }
1264
80876c20
LP		 1265 /* We add the new process to the cgroup both in the child (so
1266 * that we can be sure that no user code is ever executed
1267 * outside of the cgroup) and in the parent (so that we can be
1268 * sure that when we kill the cgroup the process will be
1269 * killed too). */
1270 if (cgroup_bondings)
4e85aff4 1271 cgroup_bonding_install_list(cgroup_bondings, pid);
2da3263a 1272
81a2b7ce 1273 log_debug("Forked %s as %llu", command->path, (unsigned long long) pid);
2da3263a 1274
9fb86720
LP		 1275 command->exec_status.pid = pid;
1276 command->exec_status.start_timestamp = now(CLOCK_REALTIME);
1277
034c6ed7 1278 *ret = pid;
5cb5a6ff
LP		 1279 return 0;
1280}
1281
034c6ed7
LP		 1282void exec_context_init(ExecContext *c) {
1283 assert(c);
1284
1285 c->umask = 0002;
9eba9da4 1286 c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
94f04347 1287 c->cpu_sched_policy = SCHED_OTHER;
071830ff 1288 c->syslog_priority = LOG_DAEMON|LOG_INFO;
15ae422b 1289 c->mount_flags = MS_SHARED;
034c6ed7
LP		 1290}
1291
1292void exec_context_done(ExecContext *c) {
5cb5a6ff
LP		 1293 unsigned l;
1294
1295 assert(c);
1296
1297 strv_free(c->environment);
034c6ed7 1298 c->environment = NULL;
5cb5a6ff 1299
034c6ed7 1300 for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
5cb5a6ff 1301 free(c->rlimit[l]);
034c6ed7
LP		 1302 c->rlimit[l] = NULL;
1303 }
1304
9eba9da4
LP		 1305 free(c->working_directory);
1306 c->working_directory = NULL;
1307 free(c->root_directory);
1308 c->root_directory = NULL;
5cb5a6ff 1309
80876c20
LP		 1310 free(c->tty_path);
1311 c->tty_path = NULL;
1312
df1f0afe
LP		 1313 free(c->tcpwrap_name);
1314 c->tcpwrap_name = NULL;
1315
071830ff
LP		 1316 free(c->syslog_identifier);
1317 c->syslog_identifier = NULL;
1318
5cb5a6ff 1319 free(c->user);
034c6ed7
LP		 1320 c->user = NULL;
1321
5cb5a6ff 1322 free(c->group);
034c6ed7
LP		 1323 c->group = NULL;
1324
1325 strv_free(c->supplementary_groups);
1326 c->supplementary_groups = NULL;
94f04347 1327
5b6319dc
LP		 1328 free(c->pam_name);
1329 c->pam_name = NULL;
1330
94f04347
LP		 1331 if (c->capabilities) {
1332 cap_free(c->capabilities);
1333 c->capabilities = NULL;
1334 }
15ae422b
LP		 1335
1336 strv_free(c->read_only_dirs);
1337 c->read_only_dirs = NULL;
1338
1339 strv_free(c->read_write_dirs);
1340 c->read_write_dirs = NULL;
1341
1342 strv_free(c->inaccessible_dirs);
1343 c->inaccessible_dirs = NULL;
5cb5a6ff
LP		 1344}
1345
43d0fcbd
LP		 1346void exec_command_done(ExecCommand *c) {
1347 assert(c);
1348
1349 free(c->path);
1350 c->path = NULL;
1351
1352 strv_free(c->argv);
1353 c->argv = NULL;
1354}
1355
1356void exec_command_done_array(ExecCommand *c, unsigned n) {
1357 unsigned i;
1358
1359 for (i = 0; i < n; i++)
1360 exec_command_done(c+i);
1361}
1362
5cb5a6ff
LP		 1363void exec_command_free_list(ExecCommand *c) {
1364 ExecCommand *i;
1365
1366 while ((i = c)) {
034c6ed7 1367 LIST_REMOVE(ExecCommand, command, c, i);
43d0fcbd 1368 exec_command_done(i);
5cb5a6ff
LP		 1369 free(i);
1370 }
1371}
1372
034c6ed7
LP		 1373void exec_command_free_array(ExecCommand **c, unsigned n) {
1374 unsigned i;
1375
1376 for (i = 0; i < n; i++) {
1377 exec_command_free_list(c[i]);
1378 c[i] = NULL;
1379 }
1380}
1381
15ae422b
LP		 1382static void strv_fprintf(FILE *f, char **l) {
1383 char **g;
1384
1385 assert(f);
1386
1387 STRV_FOREACH(g, l)
1388 fprintf(f, " %s", *g);
1389}
1390
5cb5a6ff 1391void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
94f04347
LP		 1392 char ** e;
1393 unsigned i;
9eba9da4 1394
5cb5a6ff
LP		 1395 assert(c);
1396 assert(f);
1397
1398 if (!prefix)
1399 prefix = "";
1400
1401 fprintf(f,
94f04347
LP		 1402 "%sUMask: %04o\n"
1403 "%sWorkingDirectory: %s\n"
451a074f 1404 "%sRootDirectory: %s\n"
15ae422b
LP		 1405 "%sNonBlocking: %s\n"
1406 "%sPrivateTmp: %s\n",
5cb5a6ff 1407 prefix, c->umask,
9eba9da4 1408 prefix, c->working_directory ? c->working_directory : "/",
451a074f 1409 prefix, c->root_directory ? c->root_directory : "/",
15ae422b
LP		 1410 prefix, yes_no(c->non_blocking),
1411 prefix, yes_no(c->private_tmp));
fb33a393 1412
94f04347
LP		 1413 if (c->environment)
1414 for (e = c->environment; *e; e++)
1415 fprintf(f, "%sEnvironment: %s\n", prefix, *e);
1416
df1f0afe
LP		 1417 if (c->tcpwrap_name)
1418 fprintf(f,
1419 "%sTCPWrapName: %s\n",
1420 prefix, c->tcpwrap_name);
1421
fb33a393
LP		 1422 if (c->nice_set)
1423 fprintf(f,
1424 "%sNice: %i\n",
1425 prefix, c->nice);
1426
1427 if (c->oom_adjust_set)
1428 fprintf(f,
1429 "%sOOMAdjust: %i\n",
1430 prefix, c->oom_adjust);
9eba9da4 1431
94f04347
LP		 1432 for (i = 0; i < RLIM_NLIMITS; i++)
1433 if (c->rlimit[i])
ea430986 1434 fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
94f04347 1435
9eba9da4
LP		 1436 if (c->ioprio_set)
1437 fprintf(f,
1438 "%sIOSchedulingClass: %s\n"
1439 "%sIOPriority: %i\n",
94f04347 1440 prefix, ioprio_class_to_string(IOPRIO_PRIO_CLASS(c->ioprio)),
9eba9da4 1441 prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
94f04347
LP		 1442
1443 if (c->cpu_sched_set)
1444 fprintf(f,
1445 "%sCPUSchedulingPolicy: %s\n"
38b48754
LP		 1446 "%sCPUSchedulingPriority: %i\n"
1447 "%sCPUSchedulingResetOnFork: %s\n",
94f04347 1448 prefix, sched_policy_to_string(c->cpu_sched_policy),
38b48754
LP		 1449 prefix, c->cpu_sched_priority,
1450 prefix, yes_no(c->cpu_sched_reset_on_fork));
94f04347
LP		 1451
1452 if (c->cpu_affinity_set) {
1453 fprintf(f, "%sCPUAffinity:", prefix);
1454 for (i = 0; i < CPU_SETSIZE; i++)
1455 if (CPU_ISSET(i, &c->cpu_affinity))
1456 fprintf(f, " %i", i);
1457 fputs("\n", f);
1458 }
1459
1460 if (c->timer_slack_ns_set)
1461 fprintf(f, "%sTimerSlackNS: %lu\n", prefix, c->timer_slack_ns);
1462
1463 fprintf(f,
80876c20
LP		 1464 "%sStandardInput: %s\n"
1465 "%sStandardOutput: %s\n"
1466 "%sStandardError: %s\n",
1467 prefix, exec_input_to_string(c->std_input),
1468 prefix, exec_output_to_string(c->std_output),
1469 prefix, exec_output_to_string(c->std_error));
1470
1471 if (c->tty_path)
1472 fprintf(f,
1473 "%sTTYPath: %s\n",
1474 prefix, c->tty_path);
94f04347 1475
9a6bca7a
LP		 1476 if (c->std_output == EXEC_OUTPUT_SYSLOG || c->std_output == EXEC_OUTPUT_KMSG ||
1477 c->std_error == EXEC_OUTPUT_SYSLOG || c->std_error == EXEC_OUTPUT_KMSG)
94f04347
LP		 1478 fprintf(f,
1479 "%sSyslogFacility: %s\n"
1480 "%sSyslogLevel: %s\n",
1481 prefix, log_facility_to_string(LOG_FAC(c->syslog_priority)),
1482 prefix, log_level_to_string(LOG_PRI(c->syslog_priority)));
1483
1484 if (c->capabilities) {
1485 char *t;
1486 if ((t = cap_to_text(c->capabilities, NULL))) {
1487 fprintf(f, "%sCapabilities: %s\n",
1488 prefix, t);
1489 cap_free(t);
1490 }
1491 }
1492
1493 if (c->secure_bits)
1494 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
1495 prefix,
1496 (c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "",
1497 (c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
1498 (c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
1499 (c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
1500 (c->secure_bits & SECURE_NOROOT) ? " noroot" : "",
1501 (c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
1502
1503 if (c->capability_bounding_set_drop) {
1504 fprintf(f, "%sCapabilityBoundingSetDrop:", prefix);
1505
1506 for (i = 0; i <= CAP_LAST_CAP; i++)
1507 if (c->capability_bounding_set_drop & (1 << i)) {
1508 char *t;
1509
1510 if ((t = cap_to_name(i))) {
1511 fprintf(f, " %s", t);
1512 free(t);
1513 }
1514 }
1515
1516 fputs("\n", f);
1517 }
1518
1519 if (c->user)
1520 fprintf(f, "%sUser: %s", prefix, c->user);
1521 if (c->group)
1522 fprintf(f, "%sGroup: %s", prefix, c->group);
1523
15ae422b 1524 if (strv_length(c->supplementary_groups) > 0) {
94f04347 1525 fprintf(f, "%sSupplementaryGroups:", prefix);
15ae422b
LP		 1526 strv_fprintf(f, c->supplementary_groups);
1527 fputs("\n", f);
1528 }
94f04347 1529
5b6319dc
LP		 1530 if (c->pam_name)
1531 fprintf(f, "%sPAMName: %s", prefix, c->pam_name);
1532
15ae422b
LP		 1533 if (strv_length(c->read_write_dirs) > 0) {
1534 fprintf(f, "%sReadWriteDirs:", prefix);
1535 strv_fprintf(f, c->read_write_dirs);
1536 fputs("\n", f);
1537 }
1538
1539 if (strv_length(c->read_only_dirs) > 0) {
1540 fprintf(f, "%sReadOnlyDirs:", prefix);
1541 strv_fprintf(f, c->read_only_dirs);
1542 fputs("\n", f);
1543 }
94f04347 1544
15ae422b
LP		 1545 if (strv_length(c->inaccessible_dirs) > 0) {
1546 fprintf(f, "%sInaccessibleDirs:", prefix);
1547 strv_fprintf(f, c->inaccessible_dirs);
94f04347
LP		 1548 fputs("\n", f);
1549 }
5cb5a6ff
LP		 1550}
1551
034c6ed7
LP		 1552void exec_status_fill(ExecStatus *s, pid_t pid, int code, int status) {
1553 assert(s);
5cb5a6ff 1554
034c6ed7 1555 s->pid = pid;
9fb86720
LP		 1556 s->exit_timestamp = now(CLOCK_REALTIME);
1557
034c6ed7
LP		 1558 s->code = code;
1559 s->status = status;
9fb86720
LP		 1560}
1561
1562void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
1563 char buf[FORMAT_TIMESTAMP_MAX];
1564
1565 assert(s);
1566 assert(f);
1567
1568 if (!prefix)
1569 prefix = "";
1570
1571 if (s->pid <= 0)
1572 return;
1573
1574 fprintf(f,
1575 "%sPID: %llu\n",
1576 prefix, (unsigned long long) s->pid);
1577
1578 if (s->start_timestamp > 0)
1579 fprintf(f,
1580 "%sStart Timestamp: %s\n",
1581 prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp));
1582
1583 if (s->exit_timestamp > 0)
1584 fprintf(f,
1585 "%sExit Timestamp: %s\n"
1586 "%sExit Code: %s\n"
1587 "%sExit Status: %i\n",
1588 prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp),
1589 prefix, sigchld_code_to_string(s->code),
1590 prefix, s->status);
5cb5a6ff 1591}
44d8db9e 1592
9e2f7c11 1593char *exec_command_line(char **argv) {
44d8db9e
LP		 1594 size_t k;
1595 char *n, *p, **a;
1596 bool first = true;
1597
9e2f7c11 1598 assert(argv);
44d8db9e 1599
9164977d 1600 k = 1;
9e2f7c11 1601 STRV_FOREACH(a, argv)
44d8db9e
LP		 1602 k += strlen(*a)+3;
1603
1604 if (!(n = new(char, k)))
1605 return NULL;
1606
1607 p = n;
9e2f7c11 1608 STRV_FOREACH(a, argv) {
44d8db9e
LP		 1609
1610 if (!first)
1611 *(p++) = ' ';
1612 else
1613 first = false;
1614
1615 if (strpbrk(*a, WHITESPACE)) {
1616 *(p++) = '\'';
1617 p = stpcpy(p, *a);
1618 *(p++) = '\'';
1619 } else
1620 p = stpcpy(p, *a);
1621
1622 }
1623
9164977d
LP		 1624 *p = 0;
1625
44d8db9e
LP		 1626 /* FIXME: this doesn't really handle arguments that have
1627 * spaces and ticks in them */
1628
1629 return n;
1630}
1631
1632void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
9fb86720
LP		 1633 char *p2;
1634 const char *prefix2;
1635
44d8db9e
LP		 1636 char *cmd;
1637
1638 assert(c);
1639 assert(f);
1640
1641 if (!prefix)
1642 prefix = "";
9fb86720
LP		 1643 p2 = strappend(prefix, "\t");
1644 prefix2 = p2 ? p2 : prefix;
44d8db9e 1645
9e2f7c11 1646 cmd = exec_command_line(c->argv);
44d8db9e
LP		 1647
1648 fprintf(f,
1649 "%sCommand Line: %s\n",
1650 prefix, cmd ? cmd : strerror(ENOMEM));
1651
1652 free(cmd);
9fb86720
LP		 1653
1654 exec_status_dump(&c->exec_status, f, prefix2);
1655
1656 free(p2);
44d8db9e
LP		 1657}
1658
1659void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
1660 assert(f);
1661
1662 if (!prefix)
1663 prefix = "";
1664
1665 LIST_FOREACH(command, c, c)
1666 exec_command_dump(c, f, prefix);
1667}
94f04347 1668
a6a80b4f
LP		 1669void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
1670 ExecCommand *end;
1671
1672 assert(l);
1673 assert(e);
1674
1675 if (*l) {
1676 /* It's kinda important that we keep the order here */
1677 LIST_FIND_TAIL(ExecCommand, command, *l, end);
1678 LIST_INSERT_AFTER(ExecCommand, command, *l, end, e);
1679 } else
1680 *l = e;
1681}
1682
26fd040d
LP		 1683int exec_command_set(ExecCommand *c, const char *path, ...) {
1684 va_list ap;
1685 char **l, *p;
1686
1687 assert(c);
1688 assert(path);
1689
1690 va_start(ap, path);
1691 l = strv_new_ap(path, ap);
1692 va_end(ap);
1693
1694 if (!l)
1695 return -ENOMEM;
1696
1697 if (!(p = strdup(path))) {
1698 strv_free(l);
1699 return -ENOMEM;
1700 }
1701
1702 free(c->path);
1703 c->path = p;
1704
1705 strv_free(c->argv);
1706 c->argv = l;
1707
1708 return 0;
1709}
1710
80876c20 1711const char* exit_status_to_string(ExitStatus status) {
b8d3418f
LP		 1712
1713 /* We cast to int here, so that -Wenum doesn't complain that
1714 * EXIT_SUCCESS/EXIT_FAILURE aren't in the enum */
1715
1716 switch ((int) status) {
80876c20
LP		 1717
1718 case EXIT_SUCCESS:
1719 return "SUCCESS";
1720
1721 case EXIT_FAILURE:
1722 return "FAILURE";
1723
1724 case EXIT_INVALIDARGUMENT:
1725 return "INVALIDARGUMENT";
1726
1727 case EXIT_NOTIMPLEMENTED:
1728 return "NOTIMPLEMENTED";
1729
1730 case EXIT_NOPERMISSION:
1731 return "NOPERMISSION";
1732
1733 case EXIT_NOTINSTALLED:
1734 return "NOTINSSTALLED";
1735
1736 case EXIT_NOTCONFIGURED:
1737 return "NOTCONFIGURED";
1738
1739 case EXIT_NOTRUNNING:
1740 return "NOTRUNNING";
1741
1742 case EXIT_CHDIR:
1743 return "CHDIR";
1744
1745 case EXIT_NICE:
1746 return "NICE";
1747
1748 case EXIT_FDS:
1749 return "FDS";
1750
1751 case EXIT_EXEC:
1752 return "EXEC";
1753
1754 case EXIT_MEMORY:
1755 return "MEMORY";
1756
1757 case EXIT_LIMITS:
1758 return "LIMITS";
1759
1760 case EXIT_OOM_ADJUST:
1761 return "OOM_ADJUST";
1762
1763 case EXIT_SIGNAL_MASK:
1764 return "SIGNAL_MASK";
1765
1766 case EXIT_STDIN:
1767 return "STDIN";
1768
1769 case EXIT_STDOUT:
1770 return "STDOUT";
1771
1772 case EXIT_CHROOT:
1773 return "CHROOT";
1774
1775 case EXIT_IOPRIO:
1776 return "IOPRIO";
1777
1778 case EXIT_TIMERSLACK:
1779 return "TIMERSLACK";
1780
1781 case EXIT_SECUREBITS:
1782 return "SECUREBITS";
1783
1784 case EXIT_SETSCHEDULER:
1785 return "SETSCHEDULER";
1786
1787 case EXIT_CPUAFFINITY:
1788 return "CPUAFFINITY";
1789
1790 case EXIT_GROUP:
1791 return "GROUP";
1792
1793 case EXIT_USER:
1794 return "USER";
1795
1796 case EXIT_CAPABILITIES:
1797 return "CAPABILITIES";
1798
1799 case EXIT_CGROUP:
1800 return "CGROUP";
1801
1802 case EXIT_SETSID:
1803 return "SETSID";
1804
1805 case EXIT_CONFIRM:
1806 return "CONFIRM";
1807
1808 case EXIT_STDERR:
1809 return "STDERR";
1810
df1f0afe
LP		 1811 case EXIT_TCPWRAP:
1812 return "TCPWRAP";
1813
5b6319dc
LP		 1814 case EXIT_PAM:
1815 return "PAM";
1816
80876c20
LP		 1817 default:
1818 return NULL;
1819 }
1820}
1821
1822static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
1823 [EXEC_INPUT_NULL] = "null",
1824 [EXEC_INPUT_TTY] = "tty",
1825 [EXEC_INPUT_TTY_FORCE] = "tty-force",
4f2d528d
LP		 1826 [EXEC_INPUT_TTY_FAIL] = "tty-fail",
1827 [EXEC_INPUT_SOCKET] = "socket"
80876c20
LP		 1828};
1829
94f04347 1830static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
80876c20 1831 [EXEC_OUTPUT_INHERIT] = "inherit",
94f04347 1832 [EXEC_OUTPUT_NULL] = "null",
80876c20 1833 [EXEC_OUTPUT_TTY] = "tty",
94f04347 1834 [EXEC_OUTPUT_SYSLOG] = "syslog",
9a6bca7a 1835 [EXEC_OUTPUT_KMSG] = "kmsg",
4f2d528d 1836 [EXEC_OUTPUT_SOCKET] = "socket"
94f04347
LP		 1837};
1838
1839DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
1840
94f04347 1841DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
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