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mac: rename apis with mac_{selinux/smack}_ prefix
[thirdparty/systemd.git] / src / core / 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
5430f7f2
LP		 9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
a7334b09
LP		 11 (at your option) any later version.
12
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
5430f7f2 16 Lesser General Public License for more details.
a7334b09 17
5430f7f2 18 You should have received a copy of the GNU Lesser General Public License
a7334b09
LP		 19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20***/
21
5cb5a6ff 22#include <assert.h>
034c6ed7
LP		 23#include <dirent.h>
24#include <errno.h>
25#include <fcntl.h>
26#include <unistd.h>
44d8db9e 27#include <string.h>
309bff19 28#include <signal.h>
071830ff
LP		 29#include <sys/socket.h>
30#include <sys/un.h>
94f04347 31#include <sys/prctl.h>
66ee3769 32#include <linux/sched.h>
451a074f
LP		 33#include <sys/types.h>
34#include <sys/stat.h>
81a2b7ce
LP		 35#include <grp.h>
36#include <pwd.h>
15ae422b 37#include <sys/mount.h>
25e870b5 38#include <linux/fs.h>
dd6c17b1 39#include <linux/oom.h>
f2b68789 40#include <sys/poll.h>
2bef10ab 41#include <glob.h>
ac45f971 42#include <sys/personality.h>
d34cd374 43#include <libgen.h>
2b6bf07d 44#undef basename
5cb5a6ff 45
5b6319dc
LP		 46#ifdef HAVE_PAM
47#include <security/pam_appl.h>
48#endif
49
7b52a628
MS		 50#ifdef HAVE_SELINUX
51#include <selinux/selinux.h>
52#endif
53
17df7223
LP		 54#ifdef HAVE_SECCOMP
55#include <seccomp.h>
56#endif
57
eef65bf3
MS		 58#ifdef HAVE_APPARMOR
59#include <sys/apparmor.h>
60#endif
61
5cb5a6ff
LP		 62#include "execute.h"
63#include "strv.h"
64#include "macro.h"
d7832d2c 65#include "capability.h"
5cb5a6ff 66#include "util.h"
acbb0225 67#include "log.h"
20ad4cfd 68#include "sd-messages.h"
9eba9da4 69#include "ioprio.h"
94f04347 70#include "securebits.h"
15ae422b 71#include "namespace.h"
d06dacd0 72#include "exit-status.h"
dd6c17b1 73#include "missing.h"
169c1bda 74#include "utmp-wtmp.h"
f6a6225e 75#include "def.h"
9eb977db 76#include "path-util.h"
4d1a6904 77#include "env-util.h"
a5c32cff 78#include "fileio.h"
4ad49000 79#include "unit.h"
f485606b 80#include "async.h"
0d3f7bb3 81#include "selinux-util.h"
17df7223 82#include "errno-list.h"
4298d0b5 83#include "af-list.h"
e66cf1a3 84#include "mkdir.h"
eef65bf3 85#include "apparmor-util.h"
e44da745 86#include "bus-kernel.h"
16115b0a 87#include "label.h"
5cb5a6ff 88
57183d11
LP		 89#ifdef HAVE_SECCOMP
90#include "seccomp-util.h"
91#endif
92
e056b01d 93#define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC)
31a7eb86 94#define IDLE_TIMEOUT2_USEC (1*USEC_PER_SEC)
e6a26745 95
02a51aba
LP		 96/* This assumes there is a 'tty' group */
97#define TTY_MODE 0620
98
531dca78
LP		 99#define SNDBUF_SIZE (8*1024*1024)
100
034c6ed7
LP		 101static int shift_fds(int fds[], unsigned n_fds) {
102 int start, restart_from;
103
104 if (n_fds <= 0)
105 return 0;
106
a0d40ac5
LP		 107 /* Modifies the fds array! (sorts it) */
108
034c6ed7
LP		 109 assert(fds);
110
111 start = 0;
112 for (;;) {
113 int i;
114
115 restart_from = -1;
116
117 for (i = start; i < (int) n_fds; i++) {
118 int nfd;
119
120 /* Already at right index? */
121 if (fds[i] == i+3)
122 continue;
123
124 if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
125 return -errno;
126
03e334a1 127 safe_close(fds[i]);
034c6ed7
LP		 128 fds[i] = nfd;
129
130 /* Hmm, the fd we wanted isn't free? Then
131 * let's remember that and try again from here*/
132 if (nfd != i+3 && restart_from < 0)
133 restart_from = i;
134 }
135
136 if (restart_from < 0)
137 break;
138
139 start = restart_from;
140 }
141
142 return 0;
143}
144
c2748801 145static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) {
47a71eed 146 unsigned i;
e2c76839 147 int r;
47a71eed
LP		 148
149 if (n_fds <= 0)
150 return 0;
151
152 assert(fds);
153
451a074f 154 /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
47a71eed
LP		 155
156 for (i = 0; i < n_fds; i++) {
47a71eed 157
e2c76839
LP		 158 if ((r = fd_nonblock(fds[i], nonblock)) < 0)
159 return r;
47a71eed 160
451a074f
LP		 161 /* We unconditionally drop FD_CLOEXEC from the fds,
162 * since after all we want to pass these fds to our
163 * children */
47a71eed 164
e2c76839
LP		 165 if ((r = fd_cloexec(fds[i], false)) < 0)
166 return r;
47a71eed
LP		 167 }
168
169 return 0;
170}
171
44a6b1b6 172_pure_ static const char *tty_path(const ExecContext *context) {
80876c20
LP		 173 assert(context);
174
175 if (context->tty_path)
176 return context->tty_path;
177
178 return "/dev/console";
179}
180
9588bc32 181static void exec_context_tty_reset(const ExecContext *context) {
6ea832a2
LP		 182 assert(context);
183
184 if (context->tty_vhangup)
185 terminal_vhangup(tty_path(context));
186
187 if (context->tty_reset)
188 reset_terminal(tty_path(context));
189
190 if (context->tty_vt_disallocate && context->tty_path)
191 vt_disallocate(context->tty_path);
192}
193
3a1286b6
MS		 194static bool is_terminal_output(ExecOutput o) {
195 return
196 o == EXEC_OUTPUT_TTY ||
197 o == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
198 o == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
199 o == EXEC_OUTPUT_JOURNAL_AND_CONSOLE;
200}
201
80876c20
LP		 202static int open_null_as(int flags, int nfd) {
203 int fd, r;
071830ff 204
80876c20 205 assert(nfd >= 0);
071830ff 206
613b411c
LP		 207 fd = open("/dev/null", flags|O_NOCTTY);
208 if (fd < 0)
071830ff
LP		 209 return -errno;
210
80876c20
LP		 211 if (fd != nfd) {
212 r = dup2(fd, nfd) < 0 ? -errno : nfd;
03e334a1 213 safe_close(fd);
80876c20
LP		 214 } else
215 r = nfd;
071830ff 216
80876c20 217 return r;
071830ff
LP		 218}
219
62bca2c6 220static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, const char *unit_id, int nfd) {
80876c20 221 int fd, r;
b92bea5d
ZJS		 222 union sockaddr_union sa = {
223 .un.sun_family = AF_UNIX,
224 .un.sun_path = "/run/systemd/journal/stdout",
225 };
071830ff
LP		 226
227 assert(context);
80876c20
LP		 228 assert(output < _EXEC_OUTPUT_MAX);
229 assert(ident);
230 assert(nfd >= 0);
071830ff 231
54fe0cdb
LP		 232 fd = socket(AF_UNIX, SOCK_STREAM, 0);
233 if (fd < 0)
80876c20 234 return -errno;
071830ff 235
54fe0cdb
LP		 236 r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
237 if (r < 0) {
03e334a1 238 safe_close(fd);
80876c20
LP		 239 return -errno;
240 }
071830ff 241
80876c20 242 if (shutdown(fd, SHUT_RD) < 0) {
03e334a1 243 safe_close(fd);
80876c20
LP		 244 return -errno;
245 }
071830ff 246
531dca78
LP		 247 fd_inc_sndbuf(fd, SNDBUF_SIZE);
248
80876c20 249 dprintf(fd,
62bca2c6 250 "%s\n"
80876c20
LP		 251 "%s\n"
252 "%i\n"
54fe0cdb
LP		 253 "%i\n"
254 "%i\n"
255 "%i\n"
4f4a1dbf 256 "%i\n",
4f4a1dbf 257 context->syslog_identifier ? context->syslog_identifier : ident,
62bca2c6 258 unit_id,
54fe0cdb
LP		 259 context->syslog_priority,
260 !!context->syslog_level_prefix,
261 output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE,
262 output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE,
3a1286b6 263 is_terminal_output(output));
80876c20
LP		 264
265 if (fd != nfd) {
266 r = dup2(fd, nfd) < 0 ? -errno : nfd;
03e334a1 267 safe_close(fd);
80876c20
LP		 268 } else
269 r = nfd;
071830ff 270
80876c20
LP		 271 return r;
272}
273static int open_terminal_as(const char *path, mode_t mode, int nfd) {
274 int fd, r;
071830ff 275
80876c20
LP		 276 assert(path);
277 assert(nfd >= 0);
071830ff 278
80876c20
LP		 279 if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
280 return fd;
071830ff 281
80876c20
LP		 282 if (fd != nfd) {
283 r = dup2(fd, nfd) < 0 ? -errno : nfd;
03e334a1 284 safe_close(fd);
80876c20
LP		 285 } else
286 r = nfd;
071830ff 287
80876c20
LP		 288 return r;
289}
071830ff 290
80876c20
LP		 291static bool is_terminal_input(ExecInput i) {
292 return
293 i == EXEC_INPUT_TTY ||
294 i == EXEC_INPUT_TTY_FORCE ||
295 i == EXEC_INPUT_TTY_FAIL;
296}
071830ff 297
1e3ad081
LP		 298static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) {
299
300 if (is_terminal_input(std_input) && !apply_tty_stdin)
301 return EXEC_INPUT_NULL;
071830ff 302
03fd9c49 303 if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 304 return EXEC_INPUT_NULL;
305
03fd9c49 306 return std_input;
4f2d528d
LP		 307}
308
03fd9c49 309static int fixup_output(ExecOutput std_output, int socket_fd) {
4f2d528d 310
03fd9c49 311 if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 312 return EXEC_OUTPUT_INHERIT;
313
03fd9c49 314 return std_output;
4f2d528d
LP		 315}
316
1e3ad081 317static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) {
4f2d528d
LP		 318 ExecInput i;
319
320 assert(context);
321
1e3ad081 322 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
4f2d528d
LP		 323
324 switch (i) {
071830ff 325
80876c20
LP		 326 case EXEC_INPUT_NULL:
327 return open_null_as(O_RDONLY, STDIN_FILENO);
328
329 case EXEC_INPUT_TTY:
330 case EXEC_INPUT_TTY_FORCE:
331 case EXEC_INPUT_TTY_FAIL: {
332 int fd, r;
071830ff 333
970edce6
ZJS		 334 fd = acquire_terminal(tty_path(context),
335 i == EXEC_INPUT_TTY_FAIL,
336 i == EXEC_INPUT_TTY_FORCE,
337 false,
3a43da28 338 USEC_INFINITY);
970edce6 339 if (fd < 0)
80876c20
LP		 340 return fd;
341
342 if (fd != STDIN_FILENO) {
343 r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
03e334a1 344 safe_close(fd);
80876c20
LP		 345 } else
346 r = STDIN_FILENO;
347
348 return r;
349 }
350
4f2d528d
LP		 351 case EXEC_INPUT_SOCKET:
352 return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
353
80876c20
LP		 354 default:
355 assert_not_reached("Unknown input type");
356 }
357}
358
eb17e935 359static int setup_output(const ExecContext *context, int fileno, int socket_fd, const char *ident, const char *unit_id, bool apply_tty_stdin) {
4f2d528d
LP		 360 ExecOutput o;
361 ExecInput i;
47c1d80d 362 int r;
4f2d528d 363
80876c20
LP		 364 assert(context);
365 assert(ident);
366
1e3ad081 367 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
03fd9c49 368 o = fixup_output(context->std_output, socket_fd);
4f2d528d 369
eb17e935
MS		 370 if (fileno == STDERR_FILENO) {
371 ExecOutput e;
372 e = fixup_output(context->std_error, socket_fd);
80876c20 373
eb17e935
MS		 374 /* This expects the input and output are already set up */
375
376 /* Don't change the stderr file descriptor if we inherit all
377 * the way and are not on a tty */
378 if (e == EXEC_OUTPUT_INHERIT &&
379 o == EXEC_OUTPUT_INHERIT &&
380 i == EXEC_INPUT_NULL &&
381 !is_terminal_input(context->std_input) &&
382 getppid () != 1)
383 return fileno;
384
385 /* Duplicate from stdout if possible */
386 if (e == o || e == EXEC_OUTPUT_INHERIT)
387 return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno;
071830ff 388
eb17e935 389 o = e;
80876c20 390
eb17e935 391 } else if (o == EXEC_OUTPUT_INHERIT) {
21d21ea4
LP		 392 /* If input got downgraded, inherit the original value */
393 if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input))
eb17e935 394 return open_terminal_as(tty_path(context), O_WRONLY, fileno);
21d21ea4 395
acb591e4 396 /* If the input is connected to anything that's not a /dev/null, inherit that... */
ff876e28 397 if (i != EXEC_INPUT_NULL)
eb17e935 398 return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
071830ff 399
acb591e4
LP		 400 /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */
401 if (getppid() != 1)
eb17e935 402 return fileno;
94f04347 403
eb17e935
MS		 404 /* We need to open /dev/null here anew, to get the right access mode. */
405 return open_null_as(O_WRONLY, fileno);
071830ff 406 }
94f04347 407
eb17e935 408 switch (o) {
80876c20
LP		 409
410 case EXEC_OUTPUT_NULL:
eb17e935 411 return open_null_as(O_WRONLY, fileno);
80876c20
LP		 412
413 case EXEC_OUTPUT_TTY:
4f2d528d 414 if (is_terminal_input(i))
eb17e935 415 return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
80876c20
LP		 416
417 /* We don't reset the terminal if this is just about output */
eb17e935 418 return open_terminal_as(tty_path(context), O_WRONLY, fileno);
80876c20
LP		 419
420 case EXEC_OUTPUT_SYSLOG:
28dbc1e8 421 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
9a6bca7a 422 case EXEC_OUTPUT_KMSG:
28dbc1e8 423 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
706343f4
LP		 424 case EXEC_OUTPUT_JOURNAL:
425 case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
eb17e935 426 r = connect_logger_as(context, o, ident, unit_id, fileno);
47c1d80d 427 if (r < 0) {
80cbda35
MS		 428 log_struct_unit(LOG_CRIT, unit_id,
429 "MESSAGE=Failed to connect std%s of %s to the journal socket: %s",
eb17e935 430 fileno == STDOUT_FILENO ? "out" : "err",
80cbda35
MS		 431 unit_id, strerror(-r),
432 "ERRNO=%d", -r,
433 NULL);
eb17e935 434 r = open_null_as(O_WRONLY, fileno);
47c1d80d
MS		 435 }
436 return r;
4f2d528d
LP		 437
438 case EXEC_OUTPUT_SOCKET:
439 assert(socket_fd >= 0);
eb17e935 440 return dup2(socket_fd, fileno) < 0 ? -errno : fileno;
94f04347
LP		 441
442 default:
80876c20 443 assert_not_reached("Unknown error type");
94f04347 444 }
071830ff
LP		 445}
446
02a51aba
LP		 447static int chown_terminal(int fd, uid_t uid) {
448 struct stat st;
449
450 assert(fd >= 0);
02a51aba
LP		 451
452 /* This might fail. What matters are the results. */
bab45044
LP		 453 (void) fchown(fd, uid, -1);
454 (void) fchmod(fd, TTY_MODE);
02a51aba
LP		 455
456 if (fstat(fd, &st) < 0)
457 return -errno;
458
d8b4e2e9 459 if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
02a51aba
LP		 460 return -EPERM;
461
462 return 0;
463}
464
af6da548 465static int setup_confirm_stdio(int *_saved_stdin,
80876c20
LP		 466 int *_saved_stdout) {
467 int fd = -1, saved_stdin, saved_stdout = -1, r;
468
80876c20
LP		 469 assert(_saved_stdin);
470 assert(_saved_stdout);
471
af6da548
LP		 472 saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3);
473 if (saved_stdin < 0)
474 return -errno;
80876c20 475
af6da548
LP		 476 saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3);
477 if (saved_stdout < 0) {
478 r = errno;
80876c20
LP		 479 goto fail;
480 }
481
af6da548
LP		 482 fd = acquire_terminal(
483 "/dev/console",
484 false,
485 false,
486 false,
487 DEFAULT_CONFIRM_USEC);
488 if (fd < 0) {
489 r = fd;
80876c20
LP		 490 goto fail;
491 }
492
af6da548
LP		 493 r = chown_terminal(fd, getuid());
494 if (r < 0)
02a51aba 495 goto fail;
02a51aba 496
80876c20 497 if (dup2(fd, STDIN_FILENO) < 0) {
af6da548 498 r = -errno;
80876c20
LP		 499 goto fail;
500 }
501
502 if (dup2(fd, STDOUT_FILENO) < 0) {
af6da548 503 r = -errno;
80876c20
LP		 504 goto fail;
505 }
506
507 if (fd >= 2)
03e334a1 508 safe_close(fd);
80876c20
LP		 509
510 *_saved_stdin = saved_stdin;
511 *_saved_stdout = saved_stdout;
512
513 return 0;
514
515fail:
03e334a1
LP		 516 safe_close(saved_stdout);
517 safe_close(saved_stdin);
518 safe_close(fd);
80876c20
LP		 519
520 return r;
521}
522
44b601bc 523_printf_(1, 2) static int write_confirm_message(const char *format, ...) {
03e334a1 524 _cleanup_close_ int fd = -1;
af6da548 525 va_list ap;
80876c20 526
af6da548 527 assert(format);
80876c20 528
af6da548
LP		 529 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
530 if (fd < 0)
531 return fd;
80876c20 532
af6da548
LP		 533 va_start(ap, format);
534 vdprintf(fd, format, ap);
535 va_end(ap);
80876c20 536
af6da548
LP		 537 return 0;
538}
80876c20 539
af6da548
LP		 540static int restore_confirm_stdio(int *saved_stdin,
541 int *saved_stdout) {
80876c20 542
af6da548 543 int r = 0;
80876c20 544
af6da548
LP		 545 assert(saved_stdin);
546 assert(saved_stdout);
547
548 release_terminal();
549
550 if (*saved_stdin >= 0)
80876c20 551 if (dup2(*saved_stdin, STDIN_FILENO) < 0)
af6da548 552 r = -errno;
80876c20 553
af6da548 554 if (*saved_stdout >= 0)
80876c20 555 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
af6da548 556 r = -errno;
80876c20 557
03e334a1
LP		 558 safe_close(*saved_stdin);
559 safe_close(*saved_stdout);
af6da548
LP		 560
561 return r;
562}
563
564static int ask_for_confirmation(char *response, char **argv) {
565 int saved_stdout = -1, saved_stdin = -1, r;
e1d75803 566 _cleanup_free_ char *line = NULL;
af6da548
LP		 567
568 r = setup_confirm_stdio(&saved_stdin, &saved_stdout);
569 if (r < 0)
570 return r;
571
572 line = exec_command_line(argv);
573 if (!line)
574 return -ENOMEM;
575
418b9be5 576 r = ask_char(response, "yns", "Execute %s? [Yes, No, Skip] ", line);
af6da548
LP		 577
578 restore_confirm_stdio(&saved_stdin, &saved_stdout);
579
580 return r;
80876c20
LP		 581}
582
81a2b7ce
LP		 583static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
584 bool keep_groups = false;
585 int r;
586
587 assert(context);
588
35b8ca3a 589 /* Lookup and set GID and supplementary group list. Here too
81a2b7ce
LP		 590 * we avoid NSS lookups for gid=0. */
591
592 if (context->group || username) {
593
4b67834e
LP		 594 if (context->group) {
595 const char *g = context->group;
596
597 if ((r = get_group_creds(&g, &gid)) < 0)
81a2b7ce 598 return r;
4b67834e 599 }
81a2b7ce
LP		 600
601 /* First step, initialize groups from /etc/groups */
602 if (username && gid != 0) {
603 if (initgroups(username, gid) < 0)
604 return -errno;
605
606 keep_groups = true;
607 }
608
609 /* Second step, set our gids */
610 if (setresgid(gid, gid, gid) < 0)
611 return -errno;
612 }
613
614 if (context->supplementary_groups) {
615 int ngroups_max, k;
616 gid_t *gids;
617 char **i;
618
619 /* Final step, initialize any manually set supplementary groups */
da19d5c1 620 assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0);
81a2b7ce
LP		 621
622 if (!(gids = new(gid_t, ngroups_max)))
623 return -ENOMEM;
624
625 if (keep_groups) {
626 if ((k = getgroups(ngroups_max, gids)) < 0) {
627 free(gids);
628 return -errno;
629 }
630 } else
631 k = 0;
632
633 STRV_FOREACH(i, context->supplementary_groups) {
4b67834e 634 const char *g;
81a2b7ce
LP		 635
636 if (k >= ngroups_max) {
637 free(gids);
638 return -E2BIG;
639 }
640
4b67834e
LP		 641 g = *i;
642 r = get_group_creds(&g, gids+k);
643 if (r < 0) {
81a2b7ce
LP		 644 free(gids);
645 return r;
646 }
647
648 k++;
649 }
650
651 if (setgroups(k, gids) < 0) {
652 free(gids);
653 return -errno;
654 }
655
656 free(gids);
657 }
658
659 return 0;
660}
661
662static int enforce_user(const ExecContext *context, uid_t uid) {
81a2b7ce
LP		 663 assert(context);
664
665 /* Sets (but doesn't lookup) the uid and make sure we keep the
666 * capabilities while doing so. */
667
668 if (context->capabilities) {
5ce70e5b 669 _cleanup_cap_free_ cap_t d = NULL;
81a2b7ce
LP		 670 static const cap_value_t bits[] = {
671 CAP_SETUID, /* Necessary so that we can run setresuid() below */
672 CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */
673 };
674
675 /* First step: If we need to keep capabilities but
676 * drop privileges we need to make sure we keep our
cbb21cca 677 * caps, while we drop privileges. */
693ced48 678 if (uid != 0) {
cbb21cca 679 int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS;
693ced48
LP		 680
681 if (prctl(PR_GET_SECUREBITS) != sb)
682 if (prctl(PR_SET_SECUREBITS, sb) < 0)
683 return -errno;
684 }
81a2b7ce 685
35b8ca3a 686 /* Second step: set the capabilities. This will reduce
81a2b7ce
LP		 687 * the capabilities to the minimum we need. */
688
5ce70e5b
ZJS		 689 d = cap_dup(context->capabilities);
690 if (!d)
81a2b7ce
LP		 691 return -errno;
692
693 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
5ce70e5b
ZJS		 694 cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0)
695 return -errno;
81a2b7ce 696
5ce70e5b
ZJS		 697 if (cap_set_proc(d) < 0)
698 return -errno;
81a2b7ce
LP		 699 }
700
701 /* Third step: actually set the uids */
702 if (setresuid(uid, uid, uid) < 0)
703 return -errno;
704
705 /* At this point we should have all necessary capabilities but
706 are otherwise a normal user. However, the caps might got
707 corrupted due to the setresuid() so we need clean them up
708 later. This is done outside of this call. */
709
710 return 0;
711}
712
5b6319dc
LP		 713#ifdef HAVE_PAM
714
715static int null_conv(
716 int num_msg,
717 const struct pam_message **msg,
718 struct pam_response **resp,
719 void *appdata_ptr) {
720
721 /* We don't support conversations */
722
723 return PAM_CONV_ERR;
724}
725
726static int setup_pam(
727 const char *name,
728 const char *user,
940c5210 729 uid_t uid,
5b6319dc
LP		 730 const char *tty,
731 char ***pam_env,
732 int fds[], unsigned n_fds) {
733
734 static const struct pam_conv conv = {
735 .conv = null_conv,
736 .appdata_ptr = NULL
737 };
738
739 pam_handle_t *handle = NULL;
740 sigset_t ss, old_ss;
741 int pam_code = PAM_SUCCESS;
9ba35398 742 int err;
5b6319dc
LP		 743 char **e = NULL;
744 bool close_session = false;
745 pid_t pam_pid = 0, parent_pid;
970edce6 746 int flags = 0;
5b6319dc
LP		 747
748 assert(name);
749 assert(user);
750 assert(pam_env);
751
752 /* We set up PAM in the parent process, then fork. The child
35b8ca3a 753 * will then stay around until killed via PR_GET_PDEATHSIG or
5b6319dc
LP		 754 * systemd via the cgroup logic. It will then remove the PAM
755 * session again. The parent process will exec() the actual
756 * daemon. We do things this way to ensure that the main PID
757 * of the daemon is the one we initially fork()ed. */
758
970edce6
ZJS		 759 if (log_get_max_level() < LOG_PRI(LOG_DEBUG))
760 flags |= PAM_SILENT;
761
f546241b
ZJS		 762 pam_code = pam_start(name, user, &conv, &handle);
763 if (pam_code != PAM_SUCCESS) {
5b6319dc
LP		 764 handle = NULL;
765 goto fail;
766 }
767
f546241b
ZJS		 768 if (tty) {
769 pam_code = pam_set_item(handle, PAM_TTY, tty);
770 if (pam_code != PAM_SUCCESS)
5b6319dc 771 goto fail;
f546241b 772 }
5b6319dc 773
970edce6 774 pam_code = pam_acct_mgmt(handle, flags);
f546241b 775 if (pam_code != PAM_SUCCESS)
5b6319dc
LP		 776 goto fail;
777
970edce6 778 pam_code = pam_open_session(handle, flags);
f546241b 779 if (pam_code != PAM_SUCCESS)
5b6319dc
LP		 780 goto fail;
781
782 close_session = true;
783
f546241b
ZJS		 784 e = pam_getenvlist(handle);
785 if (!e) {
5b6319dc
LP		 786 pam_code = PAM_BUF_ERR;
787 goto fail;
788 }
789
790 /* Block SIGTERM, so that we know that it won't get lost in
791 * the child */
792 if (sigemptyset(&ss) < 0 ||
793 sigaddset(&ss, SIGTERM) < 0 ||
794 sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0)
795 goto fail;
796
797 parent_pid = getpid();
798
f546241b
ZJS		 799 pam_pid = fork();
800 if (pam_pid < 0)
5b6319dc
LP		 801 goto fail;
802
803 if (pam_pid == 0) {
804 int sig;
805 int r = EXIT_PAM;
806
807 /* The child's job is to reset the PAM session on
808 * termination */
809
810 /* This string must fit in 10 chars (i.e. the length
5d6b1584
LP		 811 * of "/sbin/init"), to look pretty in /bin/ps */
812 rename_process("(sd-pam)");
5b6319dc
LP		 813
814 /* Make sure we don't keep open the passed fds in this
815 child. We assume that otherwise only those fds are
816 open here that have been opened by PAM. */
817 close_many(fds, n_fds);
818
940c5210
AK		 819 /* Drop privileges - we don't need any to pam_close_session
820 * and this will make PR_SET_PDEATHSIG work in most cases.
821 * If this fails, ignore the error - but expect sd-pam threads
822 * to fail to exit normally */
823 if (setresuid(uid, uid, uid) < 0)
824 log_error("Error: Failed to setresuid() in sd-pam: %s", strerror(-r));
825
826 /* Wait until our parent died. This will only work if
827 * the above setresuid() succeeds, otherwise the kernel
828 * will not allow unprivileged parents kill their privileged
829 * children this way. We rely on the control groups kill logic
5b6319dc
LP		 830 * to do the rest for us. */
831 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
832 goto child_finish;
833
834 /* Check if our parent process might already have
835 * died? */
836 if (getppid() == parent_pid) {
3dead8d9
LP		 837 for (;;) {
838 if (sigwait(&ss, &sig) < 0) {
839 if (errno == EINTR)
840 continue;
841
842 goto child_finish;
843 }
5b6319dc 844
3dead8d9
LP		 845 assert(sig == SIGTERM);
846 break;
847 }
5b6319dc
LP		 848 }
849
3dead8d9 850 /* If our parent died we'll end the session */
f546241b 851 if (getppid() != parent_pid) {
970edce6 852 pam_code = pam_close_session(handle, flags);
f546241b 853 if (pam_code != PAM_SUCCESS)
5b6319dc 854 goto child_finish;
f546241b 855 }
5b6319dc
LP		 856
857 r = 0;
858
859 child_finish:
970edce6 860 pam_end(handle, pam_code | flags);
5b6319dc
LP		 861 _exit(r);
862 }
863
864 /* If the child was forked off successfully it will do all the
865 * cleanups, so forget about the handle here. */
866 handle = NULL;
867
3b8bddde 868 /* Unblock SIGTERM again in the parent */
5b6319dc
LP		 869 if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0)
870 goto fail;
871
872 /* We close the log explicitly here, since the PAM modules
873 * might have opened it, but we don't want this fd around. */
874 closelog();
875
aa87e624
LP		 876 *pam_env = e;
877 e = NULL;
878
5b6319dc
LP		 879 return 0;
880
881fail:
970edce6
ZJS		 882 if (pam_code != PAM_SUCCESS) {
883 log_error("PAM failed: %s", pam_strerror(handle, pam_code));
9ba35398 884 err = -EPERM; /* PAM errors do not map to errno */
970edce6
ZJS		 885 } else {
886 log_error("PAM failed: %m");
9ba35398 887 err = -errno;
970edce6 888 }
9ba35398 889
5b6319dc
LP		 890 if (handle) {
891 if (close_session)
970edce6 892 pam_code = pam_close_session(handle, flags);
5b6319dc 893
970edce6 894 pam_end(handle, pam_code | flags);
5b6319dc
LP		 895 }
896
897 strv_free(e);
898
899 closelog();
900
430c18ed 901 if (pam_pid > 1) {
5b6319dc 902 kill(pam_pid, SIGTERM);
430c18ed
LP		 903 kill(pam_pid, SIGCONT);
904 }
5b6319dc 905
9ba35398 906 return err;
5b6319dc
LP		 907}
908#endif
909
5d6b1584
LP		 910static void rename_process_from_path(const char *path) {
911 char process_name[11];
912 const char *p;
913 size_t l;
914
915 /* This resulting string must fit in 10 chars (i.e. the length
916 * of "/sbin/init") to look pretty in /bin/ps */
917
2b6bf07d 918 p = basename(path);
5d6b1584
LP		 919 if (isempty(p)) {
920 rename_process("(...)");
921 return;
922 }
923
924 l = strlen(p);
925 if (l > 8) {
926 /* The end of the process name is usually more
927 * interesting, since the first bit might just be
928 * "systemd-" */
929 p = p + l - 8;
930 l = 8;
931 }
932
933 process_name[0] = '(';
934 memcpy(process_name+1, p, l);
935 process_name[1+l] = ')';
936 process_name[1+l+1] = 0;
937
938 rename_process(process_name);
939}
940
c0467cf3 941#ifdef HAVE_SECCOMP
17df7223 942
822a5960 943static int apply_seccomp(const ExecContext *c) {
17df7223
LP		 944 uint32_t negative_action, action;
945 scmp_filter_ctx *seccomp;
c0467cf3
RC		 946 Iterator i;
947 void *id;
17df7223 948 int r;
8351ceae 949
c0467cf3 950 assert(c);
8351ceae 951
17df7223
LP		 952 negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno);
953
954 seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW);
955 if (!seccomp)
956 return -ENOMEM;
8351ceae 957
e9642be2
LP		 958 if (c->syscall_archs) {
959
960 SET_FOREACH(id, c->syscall_archs, i) {
961 r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1);
962 if (r == -EEXIST)
963 continue;
7c66bae2
LP		 964 if (r < 0)
965 goto finish;
e9642be2 966 }
e9642be2 967
7c66bae2 968 } else {
e9642be2 969 r = seccomp_add_secondary_archs(seccomp);
7c66bae2
LP		 970 if (r < 0)
971 goto finish;
57183d11 972 }
8351ceae 973
57183d11 974 action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action;
17df7223
LP		 975 SET_FOREACH(id, c->syscall_filter, i) {
976 r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0);
7c66bae2
LP		 977 if (r < 0)
978 goto finish;
c0467cf3 979 }
8351ceae 980
7c66bae2
LP		 981 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
982 if (r < 0)
983 goto finish;
984
17df7223 985 r = seccomp_load(seccomp);
7c66bae2
LP		 986
987finish:
17df7223 988 seccomp_release(seccomp);
4298d0b5
LP		 989 return r;
990}
991
822a5960 992static int apply_address_families(const ExecContext *c) {
4298d0b5
LP		 993 scmp_filter_ctx *seccomp;
994 Iterator i;
995 int r;
996
997 assert(c);
998
999 seccomp = seccomp_init(SCMP_ACT_ALLOW);
1000 if (!seccomp)
1001 return -ENOMEM;
1002
1003 r = seccomp_add_secondary_archs(seccomp);
1004 if (r < 0)
1005 goto finish;
1006
1007 if (c->address_families_whitelist) {
1008 int af, first = 0, last = 0;
1009 void *afp;
1010
1011 /* If this is a whitelist, we first block the address
1012 * families that are out of range and then everything
1013 * that is not in the set. First, we find the lowest
1014 * and highest address family in the set. */
1015
1016 SET_FOREACH(afp, c->address_families, i) {
1017 af = PTR_TO_INT(afp);
17df7223 1018
4298d0b5
LP		 1019 if (af <= 0 || af >= af_max())
1020 continue;
1021
1022 if (first == 0 || af < first)
1023 first = af;
1024
1025 if (last == 0 || af > last)
1026 last = af;
1027 }
1028
1029 assert((first == 0) == (last == 0));
1030
1031 if (first == 0) {
1032
1033 /* No entries in the valid range, block everything */
1034 r = seccomp_rule_add(
1035 seccomp,
1036 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1037 SCMP_SYS(socket),
1038 0);
1039 if (r < 0)
1040 goto finish;
1041
1042 } else {
1043
1044 /* Block everything below the first entry */
1045 r = seccomp_rule_add(
1046 seccomp,
1047 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1048 SCMP_SYS(socket),
1049 1,
1050 SCMP_A0(SCMP_CMP_LT, first));
1051 if (r < 0)
1052 goto finish;
1053
1054 /* Block everything above the last entry */
1055 r = seccomp_rule_add(
1056 seccomp,
1057 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1058 SCMP_SYS(socket),
1059 1,
1060 SCMP_A0(SCMP_CMP_GT, last));
1061 if (r < 0)
1062 goto finish;
1063
1064 /* Block everything between the first and last
1065 * entry */
1066 for (af = 1; af < af_max(); af++) {
1067
1068 if (set_contains(c->address_families, INT_TO_PTR(af)))
1069 continue;
1070
1071 r = seccomp_rule_add(
1072 seccomp,
1073 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1074 SCMP_SYS(socket),
1075 1,
1076 SCMP_A0(SCMP_CMP_EQ, af));
1077 if (r < 0)
1078 goto finish;
1079 }
1080 }
1081
1082 } else {
1083 void *af;
1084
1085 /* If this is a blacklist, then generate one rule for
1086 * each address family that are then combined in OR
1087 * checks. */
1088
1089 SET_FOREACH(af, c->address_families, i) {
1090
1091 r = seccomp_rule_add(
1092 seccomp,
1093 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1094 SCMP_SYS(socket),
1095 1,
1096 SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af)));
1097 if (r < 0)
1098 goto finish;
1099 }
1100 }
1101
1102 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
1103 if (r < 0)
1104 goto finish;
1105
1106 r = seccomp_load(seccomp);
1107
1108finish:
1109 seccomp_release(seccomp);
17df7223 1110 return r;
8351ceae 1111}
4298d0b5 1112
c0467cf3 1113#endif
8351ceae 1114
31a7eb86
ZJS		 1115static void do_idle_pipe_dance(int idle_pipe[4]) {
1116 assert(idle_pipe);
1117
03e334a1
LP		 1118
1119 safe_close(idle_pipe[1]);
1120 safe_close(idle_pipe[2]);
31a7eb86
ZJS		 1121
1122 if (idle_pipe[0] >= 0) {
1123 int r;
1124
1125 r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC);
1126
1127 if (idle_pipe[3] >= 0 && r == 0 /* timeout */) {
1128 /* Signal systemd that we are bored and want to continue. */
1129 write(idle_pipe[3], "x", 1);
1130
1131 /* Wait for systemd to react to the signal above. */
1132 fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC);
1133 }
1134
03e334a1 1135 safe_close(idle_pipe[0]);
31a7eb86
ZJS		 1136
1137 }
1138
03e334a1 1139 safe_close(idle_pipe[3]);
31a7eb86
ZJS		 1140}
1141
7cae38c4 1142static int build_environment(
9fa95f85 1143 const ExecContext *c,
7cae38c4 1144 unsigned n_fds,
09812eb7 1145 usec_t watchdog_usec,
7cae38c4
LP		 1146 const char *home,
1147 const char *username,
1148 const char *shell,
1149 char ***ret) {
1150
1151 _cleanup_strv_free_ char **our_env = NULL;
1152 unsigned n_env = 0;
1153 char *x;
1154
1155 assert(c);
1156 assert(ret);
1157
09812eb7 1158 our_env = new0(char*, 10);
7cae38c4
LP		 1159 if (!our_env)
1160 return -ENOMEM;
1161
1162 if (n_fds > 0) {
ccd06097 1163 if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0)
7cae38c4
LP		 1164 return -ENOMEM;
1165 our_env[n_env++] = x;
1166
1167 if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0)
1168 return -ENOMEM;
1169 our_env[n_env++] = x;
1170 }
1171
09812eb7 1172 if (watchdog_usec > 0) {
ccd06097 1173 if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0)
09812eb7
LP		 1174 return -ENOMEM;
1175 our_env[n_env++] = x;
1176
de0671ee 1177 if (asprintf(&x, "WATCHDOG_USEC="USEC_FMT, watchdog_usec) < 0)
09812eb7
LP		 1178 return -ENOMEM;
1179 our_env[n_env++] = x;
1180 }
1181
7cae38c4
LP		 1182 if (home) {
1183 x = strappend("HOME=", home);
1184 if (!x)
1185 return -ENOMEM;
1186 our_env[n_env++] = x;
1187 }
1188
1189 if (username) {
1190 x = strappend("LOGNAME=", username);
1191 if (!x)
1192 return -ENOMEM;
1193 our_env[n_env++] = x;
1194
1195 x = strappend("USER=", username);
1196 if (!x)
1197 return -ENOMEM;
1198 our_env[n_env++] = x;
1199 }
1200
1201 if (shell) {
1202 x = strappend("SHELL=", shell);
1203 if (!x)
1204 return -ENOMEM;
1205 our_env[n_env++] = x;
1206 }
1207
1208 if (is_terminal_input(c->std_input) ||
1209 c->std_output == EXEC_OUTPUT_TTY ||
1210 c->std_error == EXEC_OUTPUT_TTY ||
1211 c->tty_path) {
1212
1213 x = strdup(default_term_for_tty(tty_path(c)));
1214 if (!x)
1215 return -ENOMEM;
1216 our_env[n_env++] = x;
1217 }
1218
1219 our_env[n_env++] = NULL;
09812eb7 1220 assert(n_env <= 10);
7cae38c4
LP		 1221
1222 *ret = our_env;
1223 our_env = NULL;
1224
1225 return 0;
1226}
1227
d35fbf6b
DM		 1228static int exec_child(ExecCommand *command,
1229 const ExecContext *context,
1230 const ExecParameters *params,
1231 ExecRuntime *runtime,
1232 char **argv,
1233 int socket_fd,
1234 int *fds, unsigned n_fds,
1235 char **files_env,
1236 int *error) {
1237
1238 _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
1239 const char *username = NULL, *home = NULL, *shell = NULL;
1240 unsigned n_dont_close = 0;
e44da745 1241 int dont_close[n_fds + 4];
d35fbf6b
DM		 1242 uid_t uid = (uid_t) -1;
1243 gid_t gid = (gid_t) -1;
1244 int i, err;
034c6ed7 1245
5cb5a6ff
LP		 1246 assert(command);
1247 assert(context);
d35fbf6b
DM		 1248 assert(params);
1249 assert(error);
1250
1251 rename_process_from_path(command->path);
1252
1253 /* We reset exactly these signals, since they are the
1254 * only ones we set to SIG_IGN in the main daemon. All
1255 * others we leave untouched because we set them to
1256 * SIG_DFL or a valid handler initially, both of which
1257 * will be demoted to SIG_DFL. */
1258 default_signals(SIGNALS_CRASH_HANDLER,
1259 SIGNALS_IGNORE, -1);
1260
1261 if (context->ignore_sigpipe)
1262 ignore_signals(SIGPIPE, -1);
1263
1264 err = reset_signal_mask();
1265 if (err < 0) {
1266 *error = EXIT_SIGNAL_MASK;
1267 return err;
1268 }
034c6ed7 1269
d35fbf6b
DM		 1270 if (params->idle_pipe)
1271 do_idle_pipe_dance(params->idle_pipe);
4f2d528d 1272
d35fbf6b
DM		 1273 /* Close sockets very early to make sure we don't
1274 * block init reexecution because it cannot bind its
1275 * sockets */
1276 log_forget_fds();
4f2d528d 1277
d35fbf6b
DM		 1278 if (socket_fd >= 0)
1279 dont_close[n_dont_close++] = socket_fd;
1280 if (n_fds > 0) {
1281 memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds);
1282 n_dont_close += n_fds;
1283 }
e44da745
DM		 1284 if (params->bus_endpoint_fd >= 0)
1285 dont_close[n_dont_close++] = params->bus_endpoint_fd;
d35fbf6b
DM		 1286 if (runtime) {
1287 if (runtime->netns_storage_socket[0] >= 0)
1288 dont_close[n_dont_close++] = runtime->netns_storage_socket[0];
1289 if (runtime->netns_storage_socket[1] >= 0)
1290 dont_close[n_dont_close++] = runtime->netns_storage_socket[1];
9fa95f85 1291 }
4f2d528d 1292
d35fbf6b
DM		 1293 err = close_all_fds(dont_close, n_dont_close);
1294 if (err < 0) {
1295 *error = EXIT_FDS;
1296 return err;
8c7be95e
LP		 1297 }
1298
d35fbf6b
DM		 1299 if (!context->same_pgrp)
1300 if (setsid() < 0) {
1301 *error = EXIT_SETSID;
1302 return -errno;
1303 }
9e2f7c11 1304
d35fbf6b
DM		 1305 exec_context_tty_reset(context);
1306
1307 if (params->confirm_spawn) {
1308 char response;
1309
1310 err = ask_for_confirmation(&response, argv);
1311 if (err == -ETIMEDOUT)
1312 write_confirm_message("Confirmation question timed out, assuming positive response.\n");
1313 else if (err < 0)
1314 write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-err));
1315 else if (response == 's') {
1316 write_confirm_message("Skipping execution.\n");
1317 *error = EXIT_CONFIRM;
1318 return -ECANCELED;
1319 } else if (response == 'n') {
1320 write_confirm_message("Failing execution.\n");
1321 *error = 0;
1322 return 0;
1323 }
1324 }
1a63a750 1325
d35fbf6b
DM		 1326 /* If a socket is connected to STDIN/STDOUT/STDERR, we
1327 * must sure to drop O_NONBLOCK */
1328 if (socket_fd >= 0)
1329 fd_nonblock(socket_fd, false);
acbb0225 1330
d35fbf6b
DM		 1331 err = setup_input(context, socket_fd, params->apply_tty_stdin);
1332 if (err < 0) {
1333 *error = EXIT_STDIN;
1334 return err;
1335 }
034c6ed7 1336
d35fbf6b
DM		 1337 err = setup_output(context, STDOUT_FILENO, socket_fd, basename(command->path), params->unit_id, params->apply_tty_stdin);
1338 if (err < 0) {
1339 *error = EXIT_STDOUT;
1340 return err;
1341 }
1342
1343 err = setup_output(context, STDERR_FILENO, socket_fd, basename(command->path), params->unit_id, params->apply_tty_stdin);
1344 if (err < 0) {
1345 *error = EXIT_STDERR;
1346 return err;
1347 }
1348
1349 if (params->cgroup_path) {
1350 err = cg_attach_everywhere(params->cgroup_supported, params->cgroup_path, 0);
1b6d7fa7 1351 if (err < 0) {
d35fbf6b
DM		 1352 *error = EXIT_CGROUP;
1353 return err;
309bff19 1354 }
d35fbf6b 1355 }
309bff19 1356
d35fbf6b
DM		 1357 if (context->oom_score_adjust_set) {
1358 char t[16];
f2b68789 1359
d35fbf6b
DM		 1360 snprintf(t, sizeof(t), "%i", context->oom_score_adjust);
1361 char_array_0(t);
613b411c 1362
d35fbf6b
DM		 1363 if (write_string_file("/proc/self/oom_score_adj", t) < 0) {
1364 *error = EXIT_OOM_ADJUST;
1365 return -errno;
613b411c 1366 }
d35fbf6b
DM		 1367 }
1368
1369 if (context->nice_set)
1370 if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
1371 *error = EXIT_NICE;
1372 return -errno;
613b411c
LP		 1373 }
1374
d35fbf6b
DM		 1375 if (context->cpu_sched_set) {
1376 struct sched_param param = {
1377 .sched_priority = context->cpu_sched_priority,
1378 };
1379
1380 err = sched_setscheduler(0,
1381 context->cpu_sched_policy |
1382 (context->cpu_sched_reset_on_fork ?
1383 SCHED_RESET_ON_FORK : 0),
1384 &param);
4c2630eb 1385 if (err < 0) {
d35fbf6b
DM		 1386 *error = EXIT_SETSCHEDULER;
1387 return -errno;
fc9b2a84 1388 }
d35fbf6b 1389 }
fc9b2a84 1390
d35fbf6b
DM		 1391 if (context->cpuset)
1392 if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
1393 *error = EXIT_CPUAFFINITY;
1394 return -errno;
034c6ed7
LP		 1395 }
1396
d35fbf6b
DM		 1397 if (context->ioprio_set)
1398 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
1399 *error = EXIT_IOPRIO;
1400 return -errno;
1401 }
da726a4d 1402
d35fbf6b
DM		 1403 if (context->timer_slack_nsec != NSEC_INFINITY)
1404 if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
1405 *error = EXIT_TIMERSLACK;
1406 return -errno;
4c2630eb 1407 }
9eba9da4 1408
d35fbf6b
DM		 1409 if (context->personality != 0xffffffffUL)
1410 if (personality(context->personality) < 0) {
1411 *error = EXIT_PERSONALITY;
1412 return -errno;
4c2630eb 1413 }
94f04347 1414
d35fbf6b
DM		 1415 if (context->utmp_id)
1416 utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path);
1417
1418 if (context->user) {
1419 username = context->user;
1420 err = get_user_creds(&username, &uid, &gid, &home, &shell);
4c2630eb 1421 if (err < 0) {
d35fbf6b
DM		 1422 *error = EXIT_USER;
1423 return err;
071830ff
LP		 1424 }
1425
d35fbf6b
DM		 1426 if (is_terminal_input(context->std_input)) {
1427 err = chown_terminal(STDIN_FILENO, uid);
4c2630eb 1428 if (err < 0) {
d35fbf6b
DM		 1429 *error = EXIT_STDIN;
1430 return err;
8e274523 1431 }
4c2630eb 1432 }
d35fbf6b 1433 }
8e274523 1434
e44da745
DM		 1435#ifdef ENABLE_KDBUS
1436 if (params->bus_endpoint_fd >= 0 && context->bus_endpoint) {
1437 uid_t ep_uid = (uid == (uid_t) -1) ? 0 : uid;
1438
1439 err = bus_kernel_set_endpoint_policy(params->bus_endpoint_fd, ep_uid, context->bus_endpoint);
1440 if (err < 0) {
1441 *error = EXIT_BUS_ENDPOINT;
1442 return err;
1443 }
1444 }
1445#endif
1446
d35fbf6b
DM		 1447#ifdef HAVE_PAM
1448 if (params->cgroup_path && context->user && context->pam_name) {
1449 err = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0644, uid, gid);
1450 if (err < 0) {
1451 *error = EXIT_CGROUP;
1452 return err;
1453 }
034c6ed7 1454
034c6ed7 1455
d35fbf6b
DM		 1456 err = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0755, uid, gid);
1457 if (err < 0) {
1458 *error = EXIT_CGROUP;
1459 return err;
034c6ed7 1460 }
d35fbf6b
DM		 1461 }
1462#endif
034c6ed7 1463
d35fbf6b
DM		 1464 if (!strv_isempty(context->runtime_directory) && params->runtime_prefix) {
1465 char **rt;
fb33a393 1466
d35fbf6b
DM		 1467 STRV_FOREACH(rt, context->runtime_directory) {
1468 _cleanup_free_ char *p;
94f04347 1469
d35fbf6b
DM		 1470 p = strjoin(params->runtime_prefix, "/", *rt, NULL);
1471 if (!p) {
1472 *error = EXIT_RUNTIME_DIRECTORY;
1473 return -ENOMEM;
94f04347 1474 }
94f04347 1475
d35fbf6b
DM		 1476 err = mkdir_safe(p, context->runtime_directory_mode, uid, gid);
1477 if (err < 0) {
1478 *error = EXIT_RUNTIME_DIRECTORY;
1479 return err;
94f04347 1480 }
d35fbf6b
DM		 1481 }
1482 }
94f04347 1483
d35fbf6b
DM		 1484 if (params->apply_permissions) {
1485 err = enforce_groups(context, username, gid);
1486 if (err < 0) {
1487 *error = EXIT_GROUP;
1488 return err;
1489 }
1490 }
9eba9da4 1491
d35fbf6b 1492 umask(context->umask);
94f04347 1493
d35fbf6b
DM		 1494#ifdef HAVE_PAM
1495 if (params->apply_permissions && context->pam_name && username) {
1496 err = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds);
1497 if (err < 0) {
1498 *error = EXIT_PAM;
1499 return err;
1500 }
1501 }
1502#endif
ac45f971 1503
d35fbf6b
DM		 1504 if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) {
1505 err = setup_netns(runtime->netns_storage_socket);
1506 if (err < 0) {
1507 *error = EXIT_NETWORK;
1508 return err;
1509 }
1510 }
169c1bda 1511
d35fbf6b
DM		 1512 if (!strv_isempty(context->read_write_dirs) ||
1513 !strv_isempty(context->read_only_dirs) ||
1514 !strv_isempty(context->inaccessible_dirs) ||
1515 context->mount_flags != 0 ||
1516 (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) ||
e44da745 1517 params->bus_endpoint_path ||
d35fbf6b
DM		 1518 context->private_devices ||
1519 context->protect_system != PROTECT_SYSTEM_NO ||
1520 context->protect_home != PROTECT_HOME_NO) {
1521
1522 char *tmp = NULL, *var = NULL;
1523
1524 /* The runtime struct only contains the parent
1525 * of the private /tmp, which is
1526 * non-accessible to world users. Inside of it
1527 * there's a /tmp that is sticky, and that's
1528 * the one we want to use here. */
1529
1530 if (context->private_tmp && runtime) {
1531 if (runtime->tmp_dir)
1532 tmp = strappenda(runtime->tmp_dir, "/tmp");
1533 if (runtime->var_tmp_dir)
1534 var = strappenda(runtime->var_tmp_dir, "/tmp");
1535 }
d8b4e2e9 1536
d35fbf6b
DM		 1537 err = setup_namespace(
1538 context->read_write_dirs,
1539 context->read_only_dirs,
1540 context->inaccessible_dirs,
1541 tmp,
1542 var,
e44da745 1543 params->bus_endpoint_path,
d35fbf6b
DM		 1544 context->private_devices,
1545 context->protect_home,
1546 context->protect_system,
1547 context->mount_flags);
0015ebf3
MS		 1548
1549 if (err == -EPERM)
8fa6cbe1 1550 log_warning_unit(params->unit_id, "Failed to set up file system namespace due to lack of privileges. Execution sandbox will not be in effect: %s", strerror(-err));
0015ebf3 1551 else if (err < 0) {
d35fbf6b
DM		 1552 *error = EXIT_NAMESPACE;
1553 return err;
81a2b7ce 1554 }
d35fbf6b 1555 }
81a2b7ce 1556
d35fbf6b
DM		 1557 if (params->apply_chroot) {
1558 if (context->root_directory)
1559 if (chroot(context->root_directory) < 0) {
1560 *error = EXIT_CHROOT;
1561 return -errno;
8aa75193
LP		 1562 }
1563
d35fbf6b
DM		 1564 if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
1565 *error = EXIT_CHDIR;
1566 return -errno;
1567 }
1568 } else {
1569 _cleanup_free_ char *d = NULL;
8aa75193 1570
d35fbf6b
DM		 1571 if (asprintf(&d, "%s/%s",
1572 context->root_directory ? context->root_directory : "",
1573 context->working_directory ? context->working_directory : "") < 0) {
1574 *error = EXIT_MEMORY;
1575 return -ENOMEM;
8aa75193 1576 }
8aa75193 1577
d35fbf6b
DM		 1578 if (chdir(d) < 0) {
1579 *error = EXIT_CHDIR;
1580 return -errno;
1581 }
1582 }
e66cf1a3 1583
d35fbf6b
DM		 1584 /* We repeat the fd closing here, to make sure that
1585 * nothing is leaked from the PAM modules. Note that
1586 * we are more aggressive this time since socket_fd
e44da745
DM		 1587 * and the netns fds we don't need anymore. The custom
1588 * endpoint fd was needed to upload the policy and can
1589 * now be closed as well. */
d35fbf6b
DM		 1590 err = close_all_fds(fds, n_fds);
1591 if (err >= 0)
1592 err = shift_fds(fds, n_fds);
1593 if (err >= 0)
1594 err = flags_fds(fds, n_fds, context->non_blocking);
1595 if (err < 0) {
1596 *error = EXIT_FDS;
1597 return err;
1598 }
e66cf1a3 1599
d35fbf6b 1600 if (params->apply_permissions) {
e66cf1a3 1601
d35fbf6b
DM		 1602 for (i = 0; i < _RLIMIT_MAX; i++) {
1603 if (!context->rlimit[i])
1604 continue;
1605
1606 if (setrlimit_closest(i, context->rlimit[i]) < 0) {
1607 *error = EXIT_LIMITS;
1608 return -errno;
e66cf1a3
LP		 1609 }
1610 }
1611
d35fbf6b
DM		 1612 if (context->capability_bounding_set_drop) {
1613 err = capability_bounding_set_drop(context->capability_bounding_set_drop, false);
4c2630eb 1614 if (err < 0) {
d35fbf6b
DM		 1615 *error = EXIT_CAPABILITIES;
1616 return err;
3b8bddde 1617 }
4c2630eb 1618 }
3b8bddde 1619
d35fbf6b
DM		 1620 if (context->user) {
1621 err = enforce_user(context, uid);
4c2630eb 1622 if (err < 0) {
d35fbf6b
DM		 1623 *error = EXIT_USER;
1624 return err;
5b6319dc
LP		 1625 }
1626 }
d35fbf6b
DM		 1627
1628 /* PR_GET_SECUREBITS is not privileged, while
1629 * PR_SET_SECUREBITS is. So to suppress
1630 * potential EPERMs we'll try not to call
1631 * PR_SET_SECUREBITS unless necessary. */
1632 if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
1633 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
1634 *error = EXIT_SECUREBITS;
1635 return -errno;
ff01d048 1636 }
5b6319dc 1637
d35fbf6b
DM		 1638 if (context->capabilities)
1639 if (cap_set_proc(context->capabilities) < 0) {
1640 *error = EXIT_CAPABILITIES;
1641 return -errno;
613b411c
LP		 1642 }
1643
d35fbf6b
DM		 1644 if (context->no_new_privileges)
1645 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
1646 *error = EXIT_NO_NEW_PRIVILEGES;
1647 return -errno;
1648 }
1649
1650#ifdef HAVE_SECCOMP
1651 if (context->address_families_whitelist ||
1652 !set_isempty(context->address_families)) {
1653 err = apply_address_families(context);
4c2630eb 1654 if (err < 0) {
d35fbf6b
DM		 1655 *error = EXIT_ADDRESS_FAMILIES;
1656 return err;
4c2630eb
MS		 1657 }
1658 }
04aa0cb9 1659
d35fbf6b
DM		 1660 if (context->syscall_whitelist ||
1661 !set_isempty(context->syscall_filter) ||
1662 !set_isempty(context->syscall_archs)) {
1663 err = apply_seccomp(context);
1664 if (err < 0) {
1665 *error = EXIT_SECCOMP;
1666 return err;
81a2b7ce 1667 }
d35fbf6b
DM		 1668 }
1669#endif
81a2b7ce 1670
d35fbf6b 1671#ifdef HAVE_SELINUX
16115b0a
MS		 1672 if (use_selinux()) {
1673 if (context->selinux_context) {
1674 err = setexeccon(context->selinux_context);
1675 if (err < 0 && !context->selinux_context_ignore) {
1676 *error = EXIT_SELINUX_CONTEXT;
1677 return err;
1678 }
1679 }
1680
1681 if (params->selinux_context_net && socket_fd >= 0) {
1682 _cleanup_free_ char *label = NULL;
1683
cc56fafe 1684 err = mac_selinux_get_child_mls_label(socket_fd, command->path, &label);
16115b0a
MS		 1685 if (err < 0) {
1686 *error = EXIT_SELINUX_CONTEXT;
1687 return err;
1688 }
1689
1690 err = setexeccon(label);
1691 if (err < 0) {
1692 *error = EXIT_SELINUX_CONTEXT;
1693 return err;
1694 }
81a2b7ce 1695 }
81a2b7ce 1696 }
d35fbf6b 1697#endif
81a2b7ce 1698
d35fbf6b
DM		 1699#ifdef HAVE_APPARMOR
1700 if (context->apparmor_profile && use_apparmor()) {
1701 err = aa_change_onexec(context->apparmor_profile);
1702 if (err < 0 && !context->apparmor_profile_ignore) {
1703 *error = EXIT_APPARMOR_PROFILE;
5482192e 1704 return -errno;
d35fbf6b 1705 }
034c6ed7 1706 }
d35fbf6b
DM		 1707#endif
1708 }
034c6ed7 1709
d35fbf6b
DM		 1710 err = build_environment(context, n_fds, params->watchdog_usec, home, username, shell, &our_env);
1711 if (err < 0) {
1712 *error = EXIT_MEMORY;
1713 return err;
1714 }
034c6ed7 1715
d35fbf6b
DM		 1716 final_env = strv_env_merge(5,
1717 params->environment,
1718 our_env,
1719 context->environment,
1720 files_env,
1721 pam_env,
1722 NULL);
1723 if (!final_env) {
1724 *error = EXIT_MEMORY;
1725 return -ENOMEM;
1726 }
81a2b7ce 1727
d35fbf6b
DM		 1728 final_argv = replace_env_argv(argv, final_env);
1729 if (!final_argv) {
1730 *error = EXIT_MEMORY;
1731 return -ENOMEM;
1732 }
034c6ed7 1733
d35fbf6b 1734 final_env = strv_env_clean(final_env);
260abb78 1735
d35fbf6b
DM		 1736 if (_unlikely_(log_get_max_level() >= LOG_PRI(LOG_DEBUG))) {
1737 _cleanup_free_ char *line;
81a2b7ce 1738
d35fbf6b
DM		 1739 line = exec_command_line(final_argv);
1740 if (line) {
1741 log_open();
1742 log_struct_unit(LOG_DEBUG,
1743 params->unit_id,
1744 "EXECUTABLE=%s", command->path,
1745 "MESSAGE=Executing: %s", line,
1746 NULL);
1747 log_close();
1748 }
1749 }
1750 execve(command->path, final_argv, final_env);
1751 *error = EXIT_EXEC;
1752 return -errno;
1753}
81a2b7ce 1754
d35fbf6b
DM		 1755int exec_spawn(ExecCommand *command,
1756 const ExecContext *context,
1757 const ExecParameters *params,
1758 ExecRuntime *runtime,
1759 pid_t *ret) {
8351ceae 1760
d35fbf6b
DM		 1761 _cleanup_strv_free_ char **files_env = NULL;
1762 int *fds = NULL; unsigned n_fds = 0;
1763 char *line, **argv;
1764 int socket_fd;
1765 pid_t pid;
1766 int err;
8351ceae 1767
d35fbf6b
DM		 1768 assert(command);
1769 assert(context);
1770 assert(ret);
1771 assert(params);
1772 assert(params->fds || params->n_fds <= 0);
4298d0b5 1773
d35fbf6b
DM		 1774 if (context->std_input == EXEC_INPUT_SOCKET ||
1775 context->std_output == EXEC_OUTPUT_SOCKET ||
1776 context->std_error == EXEC_OUTPUT_SOCKET) {
17df7223 1777
d35fbf6b
DM		 1778 if (params->n_fds != 1)
1779 return -EINVAL;
eef65bf3 1780
d35fbf6b
DM		 1781 socket_fd = params->fds[0];
1782 } else {
1783 socket_fd = -1;
1784 fds = params->fds;
1785 n_fds = params->n_fds;
1786 }
94f04347 1787
7491ccf2 1788 err = exec_context_load_environment(context, params->unit_id, &files_env);
d35fbf6b
DM		 1789 if (err < 0) {
1790 log_struct_unit(LOG_ERR,
1791 params->unit_id,
1792 "MESSAGE=Failed to load environment files: %s", strerror(-err),
1793 "ERRNO=%d", -err,
1794 NULL);
1795 return err;
1796 }
034c6ed7 1797
d35fbf6b 1798 argv = params->argv ?: command->argv;
034c6ed7 1799
d35fbf6b
DM		 1800 line = exec_command_line(argv);
1801 if (!line)
1802 return log_oom();
fab56fc5 1803
d35fbf6b
DM		 1804 log_struct_unit(LOG_DEBUG,
1805 params->unit_id,
1806 "EXECUTABLE=%s", command->path,
1807 "MESSAGE=About to execute: %s", line,
1808 NULL);
1809 free(line);
1810
1811 pid = fork();
1812 if (pid < 0)
1813 return -errno;
1814
1815 if (pid == 0) {
1816 int r;
034c6ed7 1817
d35fbf6b
DM		 1818 err = exec_child(command,
1819 context,
1820 params,
1821 runtime,
1822 argv,
1823 socket_fd,
1824 fds, n_fds,
1825 files_env,
1826 &r);
4c2630eb
MS		 1827 if (r != 0) {
1828 log_open();
23635a85
ZJS		 1829 log_struct(LOG_ERR, MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED),
1830 "EXECUTABLE=%s", command->path,
1831 "MESSAGE=Failed at step %s spawning %s: %s",
1832 exit_status_to_string(r, EXIT_STATUS_SYSTEMD),
1833 command->path, strerror(-err),
1834 "ERRNO=%d", -err,
1835 NULL);
1836 log_close();
4c2630eb
MS		 1837 }
1838
034c6ed7
LP		 1839 _exit(r);
1840 }
1841
bbc9006e 1842 log_struct_unit(LOG_DEBUG,
d35fbf6b 1843 params->unit_id,
ccd06097
ZJS		 1844 "MESSAGE=Forked %s as "PID_FMT,
1845 command->path, pid,
e62d8c39 1846 NULL);
23635a85 1847
80876c20
LP		 1848 /* We add the new process to the cgroup both in the child (so
1849 * that we can be sure that no user code is ever executed
1850 * outside of the cgroup) and in the parent (so that we can be
1851 * sure that when we kill the cgroup the process will be
1852 * killed too). */
d35fbf6b
DM		 1853 if (params->cgroup_path)
1854 cg_attach(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, pid);
2da3263a 1855
b58b4116 1856 exec_status_start(&command->exec_status, pid);
9fb86720 1857
034c6ed7 1858 *ret = pid;
5cb5a6ff
LP		 1859 return 0;
1860}
1861
034c6ed7
LP		 1862void exec_context_init(ExecContext *c) {
1863 assert(c);
1864
4c12626c 1865 c->umask = 0022;
9eba9da4 1866 c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
94f04347 1867 c->cpu_sched_policy = SCHED_OTHER;
071830ff 1868 c->syslog_priority = LOG_DAEMON|LOG_INFO;
74922904 1869 c->syslog_level_prefix = true;
353e12c2 1870 c->ignore_sigpipe = true;
3a43da28 1871 c->timer_slack_nsec = NSEC_INFINITY;
ac45f971 1872 c->personality = 0xffffffffUL;
e66cf1a3 1873 c->runtime_directory_mode = 0755;
034c6ed7
LP		 1874}
1875
613b411c 1876void exec_context_done(ExecContext *c) {
5cb5a6ff
LP		 1877 unsigned l;
1878
1879 assert(c);
1880
1881 strv_free(c->environment);
034c6ed7 1882 c->environment = NULL;
5cb5a6ff 1883
8c7be95e
LP		 1884 strv_free(c->environment_files);
1885 c->environment_files = NULL;
1886
034c6ed7 1887 for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
5cb5a6ff 1888 free(c->rlimit[l]);
034c6ed7
LP		 1889 c->rlimit[l] = NULL;
1890 }
1891
9eba9da4
LP		 1892 free(c->working_directory);
1893 c->working_directory = NULL;
1894 free(c->root_directory);
1895 c->root_directory = NULL;
5cb5a6ff 1896
80876c20
LP		 1897 free(c->tty_path);
1898 c->tty_path = NULL;
1899
071830ff
LP		 1900 free(c->syslog_identifier);
1901 c->syslog_identifier = NULL;
1902
5cb5a6ff 1903 free(c->user);
034c6ed7
LP		 1904 c->user = NULL;
1905
5cb5a6ff 1906 free(c->group);
034c6ed7
LP		 1907 c->group = NULL;
1908
1909 strv_free(c->supplementary_groups);
1910 c->supplementary_groups = NULL;
94f04347 1911
5b6319dc
LP		 1912 free(c->pam_name);
1913 c->pam_name = NULL;
1914
94f04347
LP		 1915 if (c->capabilities) {
1916 cap_free(c->capabilities);
1917 c->capabilities = NULL;
1918 }
15ae422b
LP		 1919
1920 strv_free(c->read_only_dirs);
1921 c->read_only_dirs = NULL;
1922
1923 strv_free(c->read_write_dirs);
1924 c->read_write_dirs = NULL;
1925
1926 strv_free(c->inaccessible_dirs);
1927 c->inaccessible_dirs = NULL;
82c121a4
LP		 1928
1929 if (c->cpuset)
1930 CPU_FREE(c->cpuset);
86a3475b
LP		 1931
1932 free(c->utmp_id);
1933 c->utmp_id = NULL;
b9a0e010 1934
7b52a628
MS		 1935 free(c->selinux_context);
1936 c->selinux_context = NULL;
1937
eef65bf3
MS		 1938 free(c->apparmor_profile);
1939 c->apparmor_profile = NULL;
1940
17df7223
LP		 1941 set_free(c->syscall_filter);
1942 c->syscall_filter = NULL;
57183d11
LP		 1943
1944 set_free(c->syscall_archs);
1945 c->syscall_archs = NULL;
4298d0b5
LP		 1946
1947 set_free(c->address_families);
1948 c->address_families = NULL;
e66cf1a3
LP		 1949
1950 strv_free(c->runtime_directory);
1951 c->runtime_directory = NULL;
bb7dd0b0
DM		 1952
1953 bus_endpoint_free(c->bus_endpoint);
1954 c->bus_endpoint = NULL;
e66cf1a3
LP		 1955}
1956
1957int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) {
1958 char **i;
1959
1960 assert(c);
1961
1962 if (!runtime_prefix)
1963 return 0;
1964
1965 STRV_FOREACH(i, c->runtime_directory) {
1966 _cleanup_free_ char *p;
1967
1968 p = strjoin(runtime_prefix, "/", *i, NULL);
1969 if (!p)
1970 return -ENOMEM;
1971
1972 /* We execute this synchronously, since we need to be
1973 * sure this is gone when we start the service
1974 * next. */
1975 rm_rf_dangerous(p, false, true, false);
1976 }
1977
1978 return 0;
5cb5a6ff
LP		 1979}
1980
43d0fcbd
LP		 1981void exec_command_done(ExecCommand *c) {
1982 assert(c);
1983
1984 free(c->path);
1985 c->path = NULL;
1986
1987 strv_free(c->argv);
1988 c->argv = NULL;
1989}
1990
1991void exec_command_done_array(ExecCommand *c, unsigned n) {
1992 unsigned i;
1993
1994 for (i = 0; i < n; i++)
1995 exec_command_done(c+i);
1996}
1997
5cb5a6ff
LP		 1998void exec_command_free_list(ExecCommand *c) {
1999 ExecCommand *i;
2000
2001 while ((i = c)) {
71fda00f 2002 LIST_REMOVE(command, c, i);
43d0fcbd 2003 exec_command_done(i);
5cb5a6ff
LP		 2004 free(i);
2005 }
2006}
2007
034c6ed7
LP		 2008void exec_command_free_array(ExecCommand **c, unsigned n) {
2009 unsigned i;
2010
2011 for (i = 0; i < n; i++) {
2012 exec_command_free_list(c[i]);
2013 c[i] = NULL;
2014 }
2015}
2016
7491ccf2 2017int exec_context_load_environment(const ExecContext *c, const char *unit_id, char ***l) {
8c7be95e
LP		 2018 char **i, **r = NULL;
2019
2020 assert(c);
2021 assert(l);
2022
2023 STRV_FOREACH(i, c->environment_files) {
2024 char *fn;
2025 int k;
2026 bool ignore = false;
2027 char **p;
7fd1b19b 2028 _cleanup_globfree_ glob_t pglob = {};
2bef10ab 2029 int count, n;
8c7be95e
LP		 2030
2031 fn = *i;
2032
2033 if (fn[0] == '-') {
2034 ignore = true;
2035 fn ++;
2036 }
2037
2038 if (!path_is_absolute(fn)) {
8c7be95e
LP		 2039 if (ignore)
2040 continue;
2041
2042 strv_free(r);
2043 return -EINVAL;
2044 }
2045
2bef10ab 2046 /* Filename supports globbing, take all matching files */
2bef10ab
PL		 2047 errno = 0;
2048 if (glob(fn, 0, NULL, &pglob) != 0) {
2bef10ab
PL		 2049 if (ignore)
2050 continue;
8c7be95e 2051
2bef10ab
PL		 2052 strv_free(r);
2053 return errno ? -errno : -EINVAL;
2054 }
2055 count = pglob.gl_pathc;
2056 if (count == 0) {
8c7be95e
LP		 2057 if (ignore)
2058 continue;
2059
2060 strv_free(r);
2bef10ab 2061 return -EINVAL;
8c7be95e 2062 }
2bef10ab 2063 for (n = 0; n < count; n++) {
717603e3 2064 k = load_env_file(NULL, pglob.gl_pathv[n], NULL, &p);
2bef10ab
PL		 2065 if (k < 0) {
2066 if (ignore)
2067 continue;
8c7be95e 2068
2bef10ab 2069 strv_free(r);
2bef10ab 2070 return k;
e9c1ea9d 2071 }
ebc05a09 2072 /* Log invalid environment variables with filename */
e9c1ea9d 2073 if (p)
7491ccf2 2074 p = strv_env_clean_log(p, unit_id, pglob.gl_pathv[n]);
8c7be95e 2075
2bef10ab
PL		 2076 if (r == NULL)
2077 r = p;
2078 else {
2079 char **m;
8c7be95e 2080
2bef10ab
PL		 2081 m = strv_env_merge(2, r, p);
2082 strv_free(r);
2083 strv_free(p);
c84a9488 2084 if (!m)
2bef10ab 2085 return -ENOMEM;
2bef10ab
PL		 2086
2087 r = m;
2088 }
8c7be95e
LP		 2089 }
2090 }
2091
2092 *l = r;
2093
2094 return 0;
2095}
2096
6ac8fdc9 2097static bool tty_may_match_dev_console(const char *tty) {
e1d75803
RC		 2098 _cleanup_free_ char *active = NULL;
2099 char *console;
6ac8fdc9
MS		 2100
2101 if (startswith(tty, "/dev/"))
2102 tty += 5;
2103
2104 /* trivial identity? */
2105 if (streq(tty, "console"))
2106 return true;
2107
2108 console = resolve_dev_console(&active);
2109 /* if we could not resolve, assume it may */
2110 if (!console)
2111 return true;
2112
2113 /* "tty0" means the active VC, so it may be the same sometimes */
e1d75803 2114 return streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty));
6ac8fdc9
MS		 2115}
2116
2117bool exec_context_may_touch_console(ExecContext *ec) {
2118 return (ec->tty_reset || ec->tty_vhangup || ec->tty_vt_disallocate ||
2119 is_terminal_input(ec->std_input) ||
2120 is_terminal_output(ec->std_output) ||
2121 is_terminal_output(ec->std_error)) &&
2122 tty_may_match_dev_console(tty_path(ec));
2123}
2124
15ae422b
LP		 2125static void strv_fprintf(FILE *f, char **l) {
2126 char **g;
2127
2128 assert(f);
2129
2130 STRV_FOREACH(g, l)
2131 fprintf(f, " %s", *g);
2132}
2133
5cb5a6ff 2134void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
507f22bd 2135 char **e;
94f04347 2136 unsigned i;
9eba9da4 2137
5cb5a6ff
LP		 2138 assert(c);
2139 assert(f);
2140
4ad49000 2141 prefix = strempty(prefix);
5cb5a6ff
LP		 2142
2143 fprintf(f,
94f04347
LP		 2144 "%sUMask: %04o\n"
2145 "%sWorkingDirectory: %s\n"
451a074f 2146 "%sRootDirectory: %s\n"
15ae422b 2147 "%sNonBlocking: %s\n"
64747e2d 2148 "%sPrivateTmp: %s\n"
4819ff03 2149 "%sPrivateNetwork: %s\n"
7f112f50 2150 "%sPrivateDevices: %s\n"
1b8689f9
LP		 2151 "%sProtectHome: %s\n"
2152 "%sProtectSystem: %s\n"
3bb07b76 2153 "%sIgnoreSIGPIPE: %s\n",
5cb5a6ff 2154 prefix, c->umask,
9eba9da4 2155 prefix, c->working_directory ? c->working_directory : "/",
451a074f 2156 prefix, c->root_directory ? c->root_directory : "/",
15ae422b 2157 prefix, yes_no(c->non_blocking),
64747e2d 2158 prefix, yes_no(c->private_tmp),
4819ff03 2159 prefix, yes_no(c->private_network),
7f112f50 2160 prefix, yes_no(c->private_devices),
1b8689f9
LP		 2161 prefix, protect_home_to_string(c->protect_home),
2162 prefix, protect_system_to_string(c->protect_system),
3bb07b76 2163 prefix, yes_no(c->ignore_sigpipe));
fb33a393 2164
8c7be95e
LP		 2165 STRV_FOREACH(e, c->environment)
2166 fprintf(f, "%sEnvironment: %s\n", prefix, *e);
2167
2168 STRV_FOREACH(e, c->environment_files)
2169 fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e);
94f04347 2170
fb33a393
LP		 2171 if (c->nice_set)
2172 fprintf(f,
2173 "%sNice: %i\n",
2174 prefix, c->nice);
2175
dd6c17b1 2176 if (c->oom_score_adjust_set)
fb33a393 2177 fprintf(f,
dd6c17b1
LP		 2178 "%sOOMScoreAdjust: %i\n",
2179 prefix, c->oom_score_adjust);
9eba9da4 2180
94f04347
LP		 2181 for (i = 0; i < RLIM_NLIMITS; i++)
2182 if (c->rlimit[i])
de0671ee
ZJS		 2183 fprintf(f, "%s%s: "RLIM_FMT"\n",
2184 prefix, rlimit_to_string(i), c->rlimit[i]->rlim_max);
94f04347 2185
f8b69d1d 2186 if (c->ioprio_set) {
1756a011 2187 _cleanup_free_ char *class_str = NULL;
f8b69d1d 2188
1756a011 2189 ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str);
9eba9da4
LP		 2190 fprintf(f,
2191 "%sIOSchedulingClass: %s\n"
2192 "%sIOPriority: %i\n",
f8b69d1d 2193 prefix, strna(class_str),
9eba9da4 2194 prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
f8b69d1d 2195 }
94f04347 2196
f8b69d1d 2197 if (c->cpu_sched_set) {
1756a011 2198 _cleanup_free_ char *policy_str = NULL;
f8b69d1d 2199
1756a011 2200 sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str);
94f04347
LP		 2201 fprintf(f,
2202 "%sCPUSchedulingPolicy: %s\n"
38b48754
LP		 2203 "%sCPUSchedulingPriority: %i\n"
2204 "%sCPUSchedulingResetOnFork: %s\n",
f8b69d1d 2205 prefix, strna(policy_str),
38b48754
LP		 2206 prefix, c->cpu_sched_priority,
2207 prefix, yes_no(c->cpu_sched_reset_on_fork));
b929bf04 2208 }
94f04347 2209
82c121a4 2210 if (c->cpuset) {
94f04347 2211 fprintf(f, "%sCPUAffinity:", prefix);
82c121a4
LP		 2212 for (i = 0; i < c->cpuset_ncpus; i++)
2213 if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset))
43a99a7a 2214 fprintf(f, " %u", i);
94f04347
LP		 2215 fputs("\n", f);
2216 }
2217
3a43da28 2218 if (c->timer_slack_nsec != NSEC_INFINITY)
ccd06097 2219 fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec);
94f04347
LP		 2220
2221 fprintf(f,
80876c20
LP		 2222 "%sStandardInput: %s\n"
2223 "%sStandardOutput: %s\n"
2224 "%sStandardError: %s\n",
2225 prefix, exec_input_to_string(c->std_input),
2226 prefix, exec_output_to_string(c->std_output),
2227 prefix, exec_output_to_string(c->std_error));
2228
2229 if (c->tty_path)
2230 fprintf(f,
6ea832a2
LP		 2231 "%sTTYPath: %s\n"
2232 "%sTTYReset: %s\n"
2233 "%sTTYVHangup: %s\n"
2234 "%sTTYVTDisallocate: %s\n",
2235 prefix, c->tty_path,
2236 prefix, yes_no(c->tty_reset),
2237 prefix, yes_no(c->tty_vhangup),
2238 prefix, yes_no(c->tty_vt_disallocate));
94f04347 2239
5ce70e5b
ZJS		 2240 if (c->std_output == EXEC_OUTPUT_SYSLOG ||
2241 c->std_output == EXEC_OUTPUT_KMSG ||
2242 c->std_output == EXEC_OUTPUT_JOURNAL ||
2243 c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
2244 c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
2245 c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE ||
2246 c->std_error == EXEC_OUTPUT_SYSLOG ||
2247 c->std_error == EXEC_OUTPUT_KMSG ||
2248 c->std_error == EXEC_OUTPUT_JOURNAL ||
2249 c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
2250 c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
2251 c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) {
f8b69d1d 2252
5ce70e5b 2253 _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL;
f8b69d1d 2254
5ce70e5b
ZJS		 2255 log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str);
2256 log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str);
f8b69d1d 2257
94f04347
LP		 2258 fprintf(f,
2259 "%sSyslogFacility: %s\n"
2260 "%sSyslogLevel: %s\n",
f8b69d1d
MS		 2261 prefix, strna(fac_str),
2262 prefix, strna(lvl_str));
f8b69d1d 2263 }
94f04347
LP		 2264
2265 if (c->capabilities) {
5ce70e5b
ZJS		 2266 _cleanup_cap_free_charp_ char *t;
2267
2268 t = cap_to_text(c->capabilities, NULL);
2269 if (t)
2270 fprintf(f, "%sCapabilities: %s\n", prefix, t);
94f04347
LP		 2271 }
2272
2273 if (c->secure_bits)
2274 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
2275 prefix,
cbb21cca
ZJS		 2276 (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "",
2277 (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
2278 (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
2279 (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
2280 (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "",
2281 (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
94f04347
LP		 2282
2283 if (c->capability_bounding_set_drop) {
ae556c21 2284 unsigned long l;
260abb78 2285 fprintf(f, "%sCapabilityBoundingSet:", prefix);
94f04347 2286
64685e0c 2287 for (l = 0; l <= cap_last_cap(); l++)
ae556c21 2288 if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) {
5ce70e5b 2289 _cleanup_cap_free_charp_ char *t;
94f04347 2290
5ce70e5b
ZJS		 2291 t = cap_to_name(l);
2292 if (t)
94f04347 2293 fprintf(f, " %s", t);
94f04347
LP		 2294 }
2295
2296 fputs("\n", f);
2297 }
2298
2299 if (c->user)
f2d3769a 2300 fprintf(f, "%sUser: %s\n", prefix, c->user);
94f04347 2301 if (c->group)
f2d3769a 2302 fprintf(f, "%sGroup: %s\n", prefix, c->group);
94f04347 2303
15ae422b 2304 if (strv_length(c->supplementary_groups) > 0) {
94f04347 2305 fprintf(f, "%sSupplementaryGroups:", prefix);
15ae422b
LP		 2306 strv_fprintf(f, c->supplementary_groups);
2307 fputs("\n", f);
2308 }
94f04347 2309
5b6319dc 2310 if (c->pam_name)
f2d3769a 2311 fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name);
5b6319dc 2312
15ae422b
LP		 2313 if (strv_length(c->read_write_dirs) > 0) {
2314 fprintf(f, "%sReadWriteDirs:", prefix);
2315 strv_fprintf(f, c->read_write_dirs);
2316 fputs("\n", f);
2317 }
2318
2319 if (strv_length(c->read_only_dirs) > 0) {
2320 fprintf(f, "%sReadOnlyDirs:", prefix);
2321 strv_fprintf(f, c->read_only_dirs);
2322 fputs("\n", f);
2323 }
94f04347 2324
15ae422b
LP		 2325 if (strv_length(c->inaccessible_dirs) > 0) {
2326 fprintf(f, "%sInaccessibleDirs:", prefix);
2327 strv_fprintf(f, c->inaccessible_dirs);
94f04347
LP		 2328 fputs("\n", f);
2329 }
2e22afe9 2330
169c1bda
LP		 2331 if (c->utmp_id)
2332 fprintf(f,
2333 "%sUtmpIdentifier: %s\n",
2334 prefix, c->utmp_id);
7b52a628
MS		 2335
2336 if (c->selinux_context)
2337 fprintf(f,
5f8640fb
LP		 2338 "%sSELinuxContext: %s%s\n",
2339 prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context);
17df7223 2340
ac45f971
LP		 2341 if (c->personality != 0xffffffffUL)
2342 fprintf(f,
2343 "%sPersonality: %s\n",
2344 prefix, strna(personality_to_string(c->personality)));
2345
17df7223 2346 if (c->syscall_filter) {
351a19b1 2347#ifdef HAVE_SECCOMP
17df7223
LP		 2348 Iterator j;
2349 void *id;
2350 bool first = true;
351a19b1 2351#endif
17df7223
LP		 2352
2353 fprintf(f,
57183d11 2354 "%sSystemCallFilter: ",
17df7223
LP		 2355 prefix);
2356
2357 if (!c->syscall_whitelist)
2358 fputc('~', f);
2359
351a19b1 2360#ifdef HAVE_SECCOMP
17df7223
LP		 2361 SET_FOREACH(id, c->syscall_filter, j) {
2362 _cleanup_free_ char *name = NULL;
2363
2364 if (first)
2365 first = false;
2366 else
2367 fputc(' ', f);
2368
57183d11 2369 name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1);
17df7223
LP		 2370 fputs(strna(name), f);
2371 }
351a19b1 2372#endif
17df7223
LP		 2373
2374 fputc('\n', f);
2375 }
2376
57183d11
LP		 2377 if (c->syscall_archs) {
2378#ifdef HAVE_SECCOMP
2379 Iterator j;
2380 void *id;
2381#endif
2382
2383 fprintf(f,
2384 "%sSystemCallArchitectures:",
2385 prefix);
2386
2387#ifdef HAVE_SECCOMP
2388 SET_FOREACH(id, c->syscall_archs, j)
2389 fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1)));
2390#endif
2391 fputc('\n', f);
2392 }
2393
17df7223
LP		 2394 if (c->syscall_errno != 0)
2395 fprintf(f,
2396 "%sSystemCallErrorNumber: %s\n",
2397 prefix, strna(errno_to_name(c->syscall_errno)));
eef65bf3
MS		 2398
2399 if (c->apparmor_profile)
2400 fprintf(f,
2401 "%sAppArmorProfile: %s%s\n",
2402 prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile);
5cb5a6ff
LP		 2403}
2404
b58b4116 2405void exec_status_start(ExecStatus *s, pid_t pid) {
034c6ed7 2406 assert(s);
5cb5a6ff 2407
b58b4116
LP		 2408 zero(*s);
2409 s->pid = pid;
2410 dual_timestamp_get(&s->start_timestamp);
2411}
2412
6ea832a2 2413void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) {
b58b4116
LP		 2414 assert(s);
2415
0b1f4ae6 2416 if (s->pid && s->pid != pid)
b58b4116
LP		 2417 zero(*s);
2418
034c6ed7 2419 s->pid = pid;
63983207 2420 dual_timestamp_get(&s->exit_timestamp);
9fb86720 2421
034c6ed7
LP		 2422 s->code = code;
2423 s->status = status;
169c1bda 2424
6ea832a2
LP		 2425 if (context) {
2426 if (context->utmp_id)
2427 utmp_put_dead_process(context->utmp_id, pid, code, status);
2428
2429 exec_context_tty_reset(context);
2430 }
9fb86720
LP		 2431}
2432
2433void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
2434 char buf[FORMAT_TIMESTAMP_MAX];
2435
2436 assert(s);
2437 assert(f);
2438
9fb86720
LP		 2439 if (s->pid <= 0)
2440 return;
2441
4c940960
LP		 2442 prefix = strempty(prefix);
2443
9fb86720 2444 fprintf(f,
ccd06097
ZJS		 2445 "%sPID: "PID_FMT"\n",
2446 prefix, s->pid);
9fb86720 2447
63983207 2448 if (s->start_timestamp.realtime > 0)
9fb86720
LP		 2449 fprintf(f,
2450 "%sStart Timestamp: %s\n",
63983207 2451 prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime));
9fb86720 2452
63983207 2453 if (s->exit_timestamp.realtime > 0)
9fb86720
LP		 2454 fprintf(f,
2455 "%sExit Timestamp: %s\n"
2456 "%sExit Code: %s\n"
2457 "%sExit Status: %i\n",
63983207 2458 prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime),
9fb86720
LP		 2459 prefix, sigchld_code_to_string(s->code),
2460 prefix, s->status);
5cb5a6ff 2461}
44d8db9e 2462
9e2f7c11 2463char *exec_command_line(char **argv) {
44d8db9e
LP		 2464 size_t k;
2465 char *n, *p, **a;
2466 bool first = true;
2467
9e2f7c11 2468 assert(argv);
44d8db9e 2469
9164977d 2470 k = 1;
9e2f7c11 2471 STRV_FOREACH(a, argv)
44d8db9e
LP		 2472 k += strlen(*a)+3;
2473
2474 if (!(n = new(char, k)))
2475 return NULL;
2476
2477 p = n;
9e2f7c11 2478 STRV_FOREACH(a, argv) {
44d8db9e
LP		 2479
2480 if (!first)
2481 *(p++) = ' ';
2482 else
2483 first = false;
2484
2485 if (strpbrk(*a, WHITESPACE)) {
2486 *(p++) = '\'';
2487 p = stpcpy(p, *a);
2488 *(p++) = '\'';
2489 } else
2490 p = stpcpy(p, *a);
2491
2492 }
2493
9164977d
LP		 2494 *p = 0;
2495
44d8db9e
LP		 2496 /* FIXME: this doesn't really handle arguments that have
2497 * spaces and ticks in them */
2498
2499 return n;
2500}
2501
2502void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
e1d75803 2503 _cleanup_free_ char *cmd = NULL;
4c940960 2504 const char *prefix2;
44d8db9e
LP		 2505
2506 assert(c);
2507 assert(f);
2508
4c940960
LP		 2509 prefix = strempty(prefix);
2510 prefix2 = strappenda(prefix, "\t");
44d8db9e 2511
9e2f7c11 2512 cmd = exec_command_line(c->argv);
44d8db9e
LP		 2513 fprintf(f,
2514 "%sCommand Line: %s\n",
2515 prefix, cmd ? cmd : strerror(ENOMEM));
2516
9fb86720 2517 exec_status_dump(&c->exec_status, f, prefix2);
44d8db9e
LP		 2518}
2519
2520void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
2521 assert(f);
2522
4c940960 2523 prefix = strempty(prefix);
44d8db9e
LP		 2524
2525 LIST_FOREACH(command, c, c)
2526 exec_command_dump(c, f, prefix);
2527}
94f04347 2528
a6a80b4f
LP		 2529void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
2530 ExecCommand *end;
2531
2532 assert(l);
2533 assert(e);
2534
2535 if (*l) {
35b8ca3a 2536 /* It's kind of important, that we keep the order here */
71fda00f
LP		 2537 LIST_FIND_TAIL(command, *l, end);
2538 LIST_INSERT_AFTER(command, *l, end, e);
a6a80b4f
LP		 2539 } else
2540 *l = e;
2541}
2542
26fd040d
LP		 2543int exec_command_set(ExecCommand *c, const char *path, ...) {
2544 va_list ap;
2545 char **l, *p;
2546
2547 assert(c);
2548 assert(path);
2549
2550 va_start(ap, path);
2551 l = strv_new_ap(path, ap);
2552 va_end(ap);
2553
2554 if (!l)
2555 return -ENOMEM;
2556
250a918d
LP		 2557 p = strdup(path);
2558 if (!p) {
26fd040d
LP		 2559 strv_free(l);
2560 return -ENOMEM;
2561 }
2562
2563 free(c->path);
2564 c->path = p;
2565
2566 strv_free(c->argv);
2567 c->argv = l;
2568
2569 return 0;
2570}
2571
86b23b07 2572int exec_command_append(ExecCommand *c, const char *path, ...) {
e63ff941 2573 _cleanup_strv_free_ char **l = NULL;
86b23b07 2574 va_list ap;
86b23b07
JS		 2575 int r;
2576
2577 assert(c);
2578 assert(path);
2579
2580 va_start(ap, path);
2581 l = strv_new_ap(path, ap);
2582 va_end(ap);
2583
2584 if (!l)
2585 return -ENOMEM;
2586
2587 r = strv_extend_strv(&c->argv, l);
e63ff941 2588 if (r < 0)
86b23b07 2589 return r;
86b23b07
JS		 2590
2591 return 0;
2592}
2593
2594
613b411c
LP		 2595static int exec_runtime_allocate(ExecRuntime **rt) {
2596
2597 if (*rt)
2598 return 0;
2599
2600 *rt = new0(ExecRuntime, 1);
f146f5e1 2601 if (!*rt)
613b411c
LP		 2602 return -ENOMEM;
2603
2604 (*rt)->n_ref = 1;
2605 (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1;
2606
2607 return 0;
2608}
2609
2610int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) {
2611 int r;
2612
2613 assert(rt);
2614 assert(c);
2615 assert(id);
2616
2617 if (*rt)
2618 return 1;
2619
2620 if (!c->private_network && !c->private_tmp)
2621 return 0;
2622
2623 r = exec_runtime_allocate(rt);
2624 if (r < 0)
2625 return r;
2626
2627 if (c->private_network && (*rt)->netns_storage_socket[0] < 0) {
2628 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, (*rt)->netns_storage_socket) < 0)
2629 return -errno;
2630 }
2631
2632 if (c->private_tmp && !(*rt)->tmp_dir) {
2633 r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir);
2634 if (r < 0)
2635 return r;
2636 }
2637
2638 return 1;
2639}
2640
2641ExecRuntime *exec_runtime_ref(ExecRuntime *r) {
2642 assert(r);
2643 assert(r->n_ref > 0);
2644
2645 r->n_ref++;
2646 return r;
2647}
2648
2649ExecRuntime *exec_runtime_unref(ExecRuntime *r) {
2650
2651 if (!r)
2652 return NULL;
2653
2654 assert(r->n_ref > 0);
2655
2656 r->n_ref--;
2657 if (r->n_ref <= 0) {
2658 free(r->tmp_dir);
2659 free(r->var_tmp_dir);
3d94f76c 2660 safe_close_pair(r->netns_storage_socket);
613b411c
LP		 2661 free(r);
2662 }
2663
2664 return NULL;
2665}
2666
2667int exec_runtime_serialize(ExecRuntime *rt, Unit *u, FILE *f, FDSet *fds) {
2668 assert(u);
2669 assert(f);
2670 assert(fds);
2671
2672 if (!rt)
2673 return 0;
2674
2675 if (rt->tmp_dir)
2676 unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir);
2677
2678 if (rt->var_tmp_dir)
2679 unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir);
2680
2681 if (rt->netns_storage_socket[0] >= 0) {
2682 int copy;
2683
2684 copy = fdset_put_dup(fds, rt->netns_storage_socket[0]);
2685 if (copy < 0)
2686 return copy;
2687
2688 unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy);
2689 }
2690
2691 if (rt->netns_storage_socket[1] >= 0) {
2692 int copy;
2693
2694 copy = fdset_put_dup(fds, rt->netns_storage_socket[1]);
2695 if (copy < 0)
2696 return copy;
2697
2698 unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy);
2699 }
2700
2701 return 0;
2702}
2703
2704int exec_runtime_deserialize_item(ExecRuntime **rt, Unit *u, const char *key, const char *value, FDSet *fds) {
2705 int r;
2706
2707 assert(rt);
2708 assert(key);
2709 assert(value);
2710
2711 if (streq(key, "tmp-dir")) {
2712 char *copy;
2713
2714 r = exec_runtime_allocate(rt);
2715 if (r < 0)
2716 return r;
2717
2718 copy = strdup(value);
2719 if (!copy)
2720 return log_oom();
2721
2722 free((*rt)->tmp_dir);
2723 (*rt)->tmp_dir = copy;
2724
2725 } else if (streq(key, "var-tmp-dir")) {
2726 char *copy;
2727
2728 r = exec_runtime_allocate(rt);
2729 if (r < 0)
2730 return r;
2731
2732 copy = strdup(value);
2733 if (!copy)
2734 return log_oom();
2735
2736 free((*rt)->var_tmp_dir);
2737 (*rt)->var_tmp_dir = copy;
2738
2739 } else if (streq(key, "netns-socket-0")) {
2740 int fd;
2741
2742 r = exec_runtime_allocate(rt);
2743 if (r < 0)
2744 return r;
2745
2746 if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
2747 log_debug_unit(u->id, "Failed to parse netns socket value %s", value);
2748 else {
03e334a1 2749 safe_close((*rt)->netns_storage_socket[0]);
613b411c
LP		 2750 (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd);
2751 }
2752 } else if (streq(key, "netns-socket-1")) {
2753 int fd;
2754
2755 r = exec_runtime_allocate(rt);
2756 if (r < 0)
2757 return r;
2758
2759 if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
2760 log_debug_unit(u->id, "Failed to parse netns socket value %s", value);
2761 else {
03e334a1 2762 safe_close((*rt)->netns_storage_socket[1]);
613b411c
LP		 2763 (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd);
2764 }
2765 } else
2766 return 0;
2767
2768 return 1;
2769}
2770
2771static void *remove_tmpdir_thread(void *p) {
2772 _cleanup_free_ char *path = p;
2773
2774 rm_rf_dangerous(path, false, true, false);
2775 return NULL;
2776}
2777
2778void exec_runtime_destroy(ExecRuntime *rt) {
98b47d54
LP		 2779 int r;
2780
613b411c
LP		 2781 if (!rt)
2782 return;
2783
2784 /* If there are multiple users of this, let's leave the stuff around */
2785 if (rt->n_ref > 1)
2786 return;
2787
2788 if (rt->tmp_dir) {
2789 log_debug("Spawning thread to nuke %s", rt->tmp_dir);
98b47d54
LP		 2790
2791 r = asynchronous_job(remove_tmpdir_thread, rt->tmp_dir);
2792 if (r < 0) {
2793 log_warning("Failed to nuke %s: %s", rt->tmp_dir, strerror(-r));
2794 free(rt->tmp_dir);
2795 }
2796
613b411c
LP		 2797 rt->tmp_dir = NULL;
2798 }
2799
2800 if (rt->var_tmp_dir) {
2801 log_debug("Spawning thread to nuke %s", rt->var_tmp_dir);
98b47d54
LP		 2802
2803 r = asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir);
2804 if (r < 0) {
2805 log_warning("Failed to nuke %s: %s", rt->var_tmp_dir, strerror(-r));
2806 free(rt->var_tmp_dir);
2807 }
2808
613b411c
LP		 2809 rt->var_tmp_dir = NULL;
2810 }
2811
3d94f76c 2812 safe_close_pair(rt->netns_storage_socket);
613b411c
LP		 2813}
2814
80876c20
LP		 2815static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
2816 [EXEC_INPUT_NULL] = "null",
2817 [EXEC_INPUT_TTY] = "tty",
2818 [EXEC_INPUT_TTY_FORCE] = "tty-force",
4f2d528d
LP		 2819 [EXEC_INPUT_TTY_FAIL] = "tty-fail",
2820 [EXEC_INPUT_SOCKET] = "socket"
80876c20
LP		 2821};
2822
8a0867d6
LP		 2823DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
2824
94f04347 2825static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
80876c20 2826 [EXEC_OUTPUT_INHERIT] = "inherit",
94f04347 2827 [EXEC_OUTPUT_NULL] = "null",
80876c20 2828 [EXEC_OUTPUT_TTY] = "tty",
94f04347 2829 [EXEC_OUTPUT_SYSLOG] = "syslog",
28dbc1e8 2830 [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console",
9a6bca7a 2831 [EXEC_OUTPUT_KMSG] = "kmsg",
28dbc1e8 2832 [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console",
706343f4
LP		 2833 [EXEC_OUTPUT_JOURNAL] = "journal",
2834 [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console",
4f2d528d 2835 [EXEC_OUTPUT_SOCKET] = "socket"
94f04347
LP		 2836};
2837
2838DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
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