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Merge pull request #878 from poettering/network-dhcp-array-fix
[thirdparty/systemd.git] / src / core / execute.c
CommitLineData
d6c9574f 1/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
5cb5a6ff 2
a7334b09
LP		 3/***
4 This file is part of systemd.
5
6 Copyright 2010 Lennart Poettering
7
8 systemd is free software; you can redistribute it and/or modify it
5430f7f2
LP		 9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
a7334b09
LP		 11 (at your option) any later version.
12
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
5430f7f2 16 Lesser General Public License for more details.
a7334b09 17
5430f7f2 18 You should have received a copy of the GNU Lesser General Public License
a7334b09
LP		 19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20***/
21
034c6ed7
LP		 22#include <errno.h>
23#include <fcntl.h>
24#include <unistd.h>
44d8db9e 25#include <string.h>
309bff19 26#include <signal.h>
071830ff
LP		 27#include <sys/socket.h>
28#include <sys/un.h>
94f04347 29#include <sys/prctl.h>
451a074f 30#include <sys/stat.h>
81a2b7ce 31#include <grp.h>
0a6f50c0 32#include <poll.h>
2bef10ab 33#include <glob.h>
ac45f971 34#include <sys/personality.h>
5cb5a6ff 35
5b6319dc
LP		 36#ifdef HAVE_PAM
37#include <security/pam_appl.h>
38#endif
39
7b52a628
MS		 40#ifdef HAVE_SELINUX
41#include <selinux/selinux.h>
42#endif
43
17df7223
LP		 44#ifdef HAVE_SECCOMP
45#include <seccomp.h>
46#endif
47
eef65bf3
MS		 48#ifdef HAVE_APPARMOR
49#include <sys/apparmor.h>
50#endif
51
24882e06 52#include "sd-messages.h"
c6878637 53#include "rm-rf.h"
5cb5a6ff
LP		 54#include "strv.h"
55#include "macro.h"
d7832d2c 56#include "capability.h"
5cb5a6ff 57#include "util.h"
acbb0225 58#include "log.h"
9eba9da4 59#include "ioprio.h"
94f04347 60#include "securebits.h"
15ae422b 61#include "namespace.h"
d06dacd0 62#include "exit-status.h"
dd6c17b1 63#include "missing.h"
169c1bda 64#include "utmp-wtmp.h"
f6a6225e 65#include "def.h"
9eb977db 66#include "path-util.h"
4d1a6904 67#include "env-util.h"
a5c32cff 68#include "fileio.h"
4ad49000 69#include "unit.h"
f485606b 70#include "async.h"
0d3f7bb3 71#include "selinux-util.h"
17df7223 72#include "errno-list.h"
4298d0b5 73#include "af-list.h"
e66cf1a3 74#include "mkdir.h"
2ca620c4 75#include "smack-util.h"
3c70e3bb 76#include "bus-endpoint.h"
2822da4f 77#include "cap-list.h"
6482f626 78#include "formats-util.h"
0b452006 79#include "process-util.h"
288a74cc 80#include "terminal-util.h"
24882e06 81#include "signal-util.h"
5cb5a6ff 82
2eec67ac
TA		 83#ifdef HAVE_APPARMOR
84#include "apparmor-util.h"
85#endif
86
57183d11
LP		 87#ifdef HAVE_SECCOMP
88#include "seccomp-util.h"
89#endif
90
24882e06
LP		 91#include "execute.h"
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
ee33e53a 131 * let's remember that and try again from here */
034c6ed7
LP		 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
524daa8c 220static int connect_journal_socket(int fd, uid_t uid, gid_t gid) {
b92bea5d
ZJS		 221 union sockaddr_union sa = {
222 .un.sun_family = AF_UNIX,
223 .un.sun_path = "/run/systemd/journal/stdout",
224 };
524daa8c
ZJS		 225 uid_t olduid = UID_INVALID;
226 gid_t oldgid = GID_INVALID;
227 int r;
228
229 if (gid != GID_INVALID) {
230 oldgid = getgid();
231
232 r = setegid(gid);
233 if (r < 0)
234 return -errno;
235 }
236
237 if (uid != UID_INVALID) {
238 olduid = getuid();
239
240 r = seteuid(uid);
241 if (r < 0) {
242 r = -errno;
243 goto restore_gid;
244 }
245 }
246
247 r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
248 if (r < 0)
249 r = -errno;
250
251 /* If we fail to restore the uid or gid, things will likely
252 fail later on. This should only happen if an LSM interferes. */
253
254 if (uid != UID_INVALID)
255 (void) seteuid(olduid);
256
257 restore_gid:
258 if (gid != GID_INVALID)
259 (void) setegid(oldgid);
260
261 return r;
262}
263
264static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, const char *unit_id, int nfd, uid_t uid, gid_t gid) {
265 int fd, r;
071830ff
LP		 266
267 assert(context);
80876c20
LP		 268 assert(output < _EXEC_OUTPUT_MAX);
269 assert(ident);
270 assert(nfd >= 0);
071830ff 271
54fe0cdb
LP		 272 fd = socket(AF_UNIX, SOCK_STREAM, 0);
273 if (fd < 0)
80876c20 274 return -errno;
071830ff 275
524daa8c
ZJS		 276 r = connect_journal_socket(fd, uid, gid);
277 if (r < 0)
278 return r;
071830ff 279
80876c20 280 if (shutdown(fd, SHUT_RD) < 0) {
03e334a1 281 safe_close(fd);
80876c20
LP		 282 return -errno;
283 }
071830ff 284
531dca78
LP		 285 fd_inc_sndbuf(fd, SNDBUF_SIZE);
286
80876c20 287 dprintf(fd,
62bca2c6 288 "%s\n"
80876c20
LP		 289 "%s\n"
290 "%i\n"
54fe0cdb
LP		 291 "%i\n"
292 "%i\n"
293 "%i\n"
4f4a1dbf 294 "%i\n",
4f4a1dbf 295 context->syslog_identifier ? context->syslog_identifier : ident,
62bca2c6 296 unit_id,
54fe0cdb
LP		 297 context->syslog_priority,
298 !!context->syslog_level_prefix,
299 output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE,
300 output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE,
3a1286b6 301 is_terminal_output(output));
80876c20
LP		 302
303 if (fd != nfd) {
304 r = dup2(fd, nfd) < 0 ? -errno : nfd;
03e334a1 305 safe_close(fd);
80876c20
LP		 306 } else
307 r = nfd;
071830ff 308
80876c20
LP		 309 return r;
310}
311static int open_terminal_as(const char *path, mode_t mode, int nfd) {
312 int fd, r;
071830ff 313
80876c20
LP		 314 assert(path);
315 assert(nfd >= 0);
071830ff 316
80876c20
LP		 317 if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
318 return fd;
071830ff 319
80876c20
LP		 320 if (fd != nfd) {
321 r = dup2(fd, nfd) < 0 ? -errno : nfd;
03e334a1 322 safe_close(fd);
80876c20
LP		 323 } else
324 r = nfd;
071830ff 325
80876c20
LP		 326 return r;
327}
071830ff 328
80876c20
LP		 329static bool is_terminal_input(ExecInput i) {
330 return
331 i == EXEC_INPUT_TTY ||
332 i == EXEC_INPUT_TTY_FORCE ||
333 i == EXEC_INPUT_TTY_FAIL;
334}
071830ff 335
1e3ad081
LP		 336static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) {
337
338 if (is_terminal_input(std_input) && !apply_tty_stdin)
339 return EXEC_INPUT_NULL;
071830ff 340
03fd9c49 341 if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 342 return EXEC_INPUT_NULL;
343
03fd9c49 344 return std_input;
4f2d528d
LP		 345}
346
03fd9c49 347static int fixup_output(ExecOutput std_output, int socket_fd) {
4f2d528d 348
03fd9c49 349 if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 350 return EXEC_OUTPUT_INHERIT;
351
03fd9c49 352 return std_output;
4f2d528d
LP		 353}
354
1e3ad081 355static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) {
4f2d528d
LP		 356 ExecInput i;
357
358 assert(context);
359
1e3ad081 360 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
4f2d528d
LP		 361
362 switch (i) {
071830ff 363
80876c20
LP		 364 case EXEC_INPUT_NULL:
365 return open_null_as(O_RDONLY, STDIN_FILENO);
366
367 case EXEC_INPUT_TTY:
368 case EXEC_INPUT_TTY_FORCE:
369 case EXEC_INPUT_TTY_FAIL: {
370 int fd, r;
071830ff 371
970edce6
ZJS		 372 fd = acquire_terminal(tty_path(context),
373 i == EXEC_INPUT_TTY_FAIL,
374 i == EXEC_INPUT_TTY_FORCE,
375 false,
3a43da28 376 USEC_INFINITY);
970edce6 377 if (fd < 0)
80876c20
LP		 378 return fd;
379
380 if (fd != STDIN_FILENO) {
381 r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
03e334a1 382 safe_close(fd);
80876c20
LP		 383 } else
384 r = STDIN_FILENO;
385
386 return r;
387 }
388
4f2d528d
LP		 389 case EXEC_INPUT_SOCKET:
390 return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
391
80876c20
LP		 392 default:
393 assert_not_reached("Unknown input type");
394 }
395}
396
f2341e0a 397static int setup_output(Unit *unit, const ExecContext *context, int fileno, int socket_fd, const char *ident, bool apply_tty_stdin, uid_t uid, gid_t gid) {
4f2d528d
LP		 398 ExecOutput o;
399 ExecInput i;
47c1d80d 400 int r;
4f2d528d 401
f2341e0a 402 assert(unit);
80876c20
LP		 403 assert(context);
404 assert(ident);
405
1e3ad081 406 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
03fd9c49 407 o = fixup_output(context->std_output, socket_fd);
4f2d528d 408
eb17e935
MS		 409 if (fileno == STDERR_FILENO) {
410 ExecOutput e;
411 e = fixup_output(context->std_error, socket_fd);
80876c20 412
eb17e935
MS		 413 /* This expects the input and output are already set up */
414
415 /* Don't change the stderr file descriptor if we inherit all
416 * the way and are not on a tty */
417 if (e == EXEC_OUTPUT_INHERIT &&
418 o == EXEC_OUTPUT_INHERIT &&
419 i == EXEC_INPUT_NULL &&
420 !is_terminal_input(context->std_input) &&
421 getppid () != 1)
422 return fileno;
423
424 /* Duplicate from stdout if possible */
425 if (e == o || e == EXEC_OUTPUT_INHERIT)
426 return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno;
071830ff 427
eb17e935 428 o = e;
80876c20 429
eb17e935 430 } else if (o == EXEC_OUTPUT_INHERIT) {
21d21ea4
LP		 431 /* If input got downgraded, inherit the original value */
432 if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input))
eb17e935 433 return open_terminal_as(tty_path(context), O_WRONLY, fileno);
21d21ea4 434
acb591e4 435 /* If the input is connected to anything that's not a /dev/null, inherit that... */
ff876e28 436 if (i != EXEC_INPUT_NULL)
eb17e935 437 return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
071830ff 438
acb591e4
LP		 439 /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */
440 if (getppid() != 1)
eb17e935 441 return fileno;
94f04347 442
eb17e935
MS		 443 /* We need to open /dev/null here anew, to get the right access mode. */
444 return open_null_as(O_WRONLY, fileno);
071830ff 445 }
94f04347 446
eb17e935 447 switch (o) {
80876c20
LP		 448
449 case EXEC_OUTPUT_NULL:
eb17e935 450 return open_null_as(O_WRONLY, fileno);
80876c20
LP		 451
452 case EXEC_OUTPUT_TTY:
4f2d528d 453 if (is_terminal_input(i))
eb17e935 454 return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
80876c20
LP		 455
456 /* We don't reset the terminal if this is just about output */
eb17e935 457 return open_terminal_as(tty_path(context), O_WRONLY, fileno);
80876c20
LP		 458
459 case EXEC_OUTPUT_SYSLOG:
28dbc1e8 460 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
9a6bca7a 461 case EXEC_OUTPUT_KMSG:
28dbc1e8 462 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
706343f4
LP		 463 case EXEC_OUTPUT_JOURNAL:
464 case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
f2341e0a 465 r = connect_logger_as(context, o, ident, unit->id, fileno, uid, gid);
47c1d80d 466 if (r < 0) {
f2341e0a 467 log_unit_error_errno(unit, r, "Failed to connect %s to the journal socket, ignoring: %m", fileno == STDOUT_FILENO ? "stdout" : "stderr");
eb17e935 468 r = open_null_as(O_WRONLY, fileno);
47c1d80d
MS		 469 }
470 return r;
4f2d528d
LP		 471
472 case EXEC_OUTPUT_SOCKET:
473 assert(socket_fd >= 0);
eb17e935 474 return dup2(socket_fd, fileno) < 0 ? -errno : fileno;
94f04347
LP		 475
476 default:
80876c20 477 assert_not_reached("Unknown error type");
94f04347 478 }
071830ff
LP		 479}
480
02a51aba
LP		 481static int chown_terminal(int fd, uid_t uid) {
482 struct stat st;
483
484 assert(fd >= 0);
02a51aba
LP		 485
486 /* This might fail. What matters are the results. */
bab45044
LP		 487 (void) fchown(fd, uid, -1);
488 (void) fchmod(fd, TTY_MODE);
02a51aba
LP		 489
490 if (fstat(fd, &st) < 0)
491 return -errno;
492
d8b4e2e9 493 if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
02a51aba
LP		 494 return -EPERM;
495
496 return 0;
497}
498
af6da548 499static int setup_confirm_stdio(int *_saved_stdin,
80876c20
LP		 500 int *_saved_stdout) {
501 int fd = -1, saved_stdin, saved_stdout = -1, r;
502
80876c20
LP		 503 assert(_saved_stdin);
504 assert(_saved_stdout);
505
af6da548
LP		 506 saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3);
507 if (saved_stdin < 0)
508 return -errno;
80876c20 509
af6da548
LP		 510 saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3);
511 if (saved_stdout < 0) {
512 r = errno;
80876c20
LP		 513 goto fail;
514 }
515
af6da548
LP		 516 fd = acquire_terminal(
517 "/dev/console",
518 false,
519 false,
520 false,
521 DEFAULT_CONFIRM_USEC);
522 if (fd < 0) {
523 r = fd;
80876c20
LP		 524 goto fail;
525 }
526
af6da548
LP		 527 r = chown_terminal(fd, getuid());
528 if (r < 0)
02a51aba 529 goto fail;
02a51aba 530
80876c20 531 if (dup2(fd, STDIN_FILENO) < 0) {
af6da548 532 r = -errno;
80876c20
LP		 533 goto fail;
534 }
535
536 if (dup2(fd, STDOUT_FILENO) < 0) {
af6da548 537 r = -errno;
80876c20
LP		 538 goto fail;
539 }
540
541 if (fd >= 2)
03e334a1 542 safe_close(fd);
80876c20
LP		 543
544 *_saved_stdin = saved_stdin;
545 *_saved_stdout = saved_stdout;
546
547 return 0;
548
549fail:
03e334a1
LP		 550 safe_close(saved_stdout);
551 safe_close(saved_stdin);
552 safe_close(fd);
80876c20
LP		 553
554 return r;
555}
556
44b601bc 557_printf_(1, 2) static int write_confirm_message(const char *format, ...) {
03e334a1 558 _cleanup_close_ int fd = -1;
af6da548 559 va_list ap;
80876c20 560
af6da548 561 assert(format);
80876c20 562
af6da548
LP		 563 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
564 if (fd < 0)
565 return fd;
80876c20 566
af6da548
LP		 567 va_start(ap, format);
568 vdprintf(fd, format, ap);
569 va_end(ap);
80876c20 570
af6da548
LP		 571 return 0;
572}
80876c20 573
af6da548
LP		 574static int restore_confirm_stdio(int *saved_stdin,
575 int *saved_stdout) {
80876c20 576
af6da548 577 int r = 0;
80876c20 578
af6da548
LP		 579 assert(saved_stdin);
580 assert(saved_stdout);
581
582 release_terminal();
583
584 if (*saved_stdin >= 0)
80876c20 585 if (dup2(*saved_stdin, STDIN_FILENO) < 0)
af6da548 586 r = -errno;
80876c20 587
af6da548 588 if (*saved_stdout >= 0)
80876c20 589 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
af6da548 590 r = -errno;
80876c20 591
03e334a1
LP		 592 safe_close(*saved_stdin);
593 safe_close(*saved_stdout);
af6da548
LP		 594
595 return r;
596}
597
598static int ask_for_confirmation(char *response, char **argv) {
599 int saved_stdout = -1, saved_stdin = -1, r;
e1d75803 600 _cleanup_free_ char *line = NULL;
af6da548
LP		 601
602 r = setup_confirm_stdio(&saved_stdin, &saved_stdout);
603 if (r < 0)
604 return r;
605
606 line = exec_command_line(argv);
607 if (!line)
608 return -ENOMEM;
609
418b9be5 610 r = ask_char(response, "yns", "Execute %s? [Yes, No, Skip] ", line);
af6da548
LP		 611
612 restore_confirm_stdio(&saved_stdin, &saved_stdout);
613
614 return r;
80876c20
LP		 615}
616
81a2b7ce
LP		 617static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
618 bool keep_groups = false;
619 int r;
620
621 assert(context);
622
35b8ca3a 623 /* Lookup and set GID and supplementary group list. Here too
81a2b7ce
LP		 624 * we avoid NSS lookups for gid=0. */
625
626 if (context->group || username) {
627
4b67834e
LP		 628 if (context->group) {
629 const char *g = context->group;
630
631 if ((r = get_group_creds(&g, &gid)) < 0)
81a2b7ce 632 return r;
4b67834e 633 }
81a2b7ce
LP		 634
635 /* First step, initialize groups from /etc/groups */
636 if (username && gid != 0) {
637 if (initgroups(username, gid) < 0)
638 return -errno;
639
640 keep_groups = true;
641 }
642
643 /* Second step, set our gids */
644 if (setresgid(gid, gid, gid) < 0)
645 return -errno;
646 }
647
648 if (context->supplementary_groups) {
649 int ngroups_max, k;
650 gid_t *gids;
651 char **i;
652
653 /* Final step, initialize any manually set supplementary groups */
da19d5c1 654 assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0);
81a2b7ce
LP		 655
656 if (!(gids = new(gid_t, ngroups_max)))
657 return -ENOMEM;
658
659 if (keep_groups) {
660 if ((k = getgroups(ngroups_max, gids)) < 0) {
661 free(gids);
662 return -errno;
663 }
664 } else
665 k = 0;
666
667 STRV_FOREACH(i, context->supplementary_groups) {
4b67834e 668 const char *g;
81a2b7ce
LP		 669
670 if (k >= ngroups_max) {
671 free(gids);
672 return -E2BIG;
673 }
674
4b67834e
LP		 675 g = *i;
676 r = get_group_creds(&g, gids+k);
677 if (r < 0) {
81a2b7ce
LP		 678 free(gids);
679 return r;
680 }
681
682 k++;
683 }
684
685 if (setgroups(k, gids) < 0) {
686 free(gids);
687 return -errno;
688 }
689
690 free(gids);
691 }
692
693 return 0;
694}
695
696static int enforce_user(const ExecContext *context, uid_t uid) {
81a2b7ce
LP		 697 assert(context);
698
699 /* Sets (but doesn't lookup) the uid and make sure we keep the
700 * capabilities while doing so. */
701
702 if (context->capabilities) {
5ce70e5b 703 _cleanup_cap_free_ cap_t d = NULL;
81a2b7ce
LP		 704 static const cap_value_t bits[] = {
705 CAP_SETUID, /* Necessary so that we can run setresuid() below */
706 CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */
707 };
708
709 /* First step: If we need to keep capabilities but
710 * drop privileges we need to make sure we keep our
cbb21cca 711 * caps, while we drop privileges. */
693ced48 712 if (uid != 0) {
cbb21cca 713 int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS;
693ced48
LP		 714
715 if (prctl(PR_GET_SECUREBITS) != sb)
716 if (prctl(PR_SET_SECUREBITS, sb) < 0)
717 return -errno;
718 }
81a2b7ce 719
35b8ca3a 720 /* Second step: set the capabilities. This will reduce
81a2b7ce
LP		 721 * the capabilities to the minimum we need. */
722
5ce70e5b
ZJS		 723 d = cap_dup(context->capabilities);
724 if (!d)
81a2b7ce
LP		 725 return -errno;
726
727 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
5ce70e5b
ZJS		 728 cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0)
729 return -errno;
81a2b7ce 730
5ce70e5b
ZJS		 731 if (cap_set_proc(d) < 0)
732 return -errno;
81a2b7ce
LP		 733 }
734
735 /* Third step: actually set the uids */
736 if (setresuid(uid, uid, uid) < 0)
737 return -errno;
738
739 /* At this point we should have all necessary capabilities but
740 are otherwise a normal user. However, the caps might got
741 corrupted due to the setresuid() so we need clean them up
742 later. This is done outside of this call. */
743
744 return 0;
745}
746
5b6319dc
LP		 747#ifdef HAVE_PAM
748
749static int null_conv(
750 int num_msg,
751 const struct pam_message **msg,
752 struct pam_response **resp,
753 void *appdata_ptr) {
754
755 /* We don't support conversations */
756
757 return PAM_CONV_ERR;
758}
759
760static int setup_pam(
761 const char *name,
762 const char *user,
940c5210 763 uid_t uid,
5b6319dc
LP		 764 const char *tty,
765 char ***pam_env,
766 int fds[], unsigned n_fds) {
767
768 static const struct pam_conv conv = {
769 .conv = null_conv,
770 .appdata_ptr = NULL
771 };
772
773 pam_handle_t *handle = NULL;
d6e5f3ad 774 sigset_t old_ss;
5b6319dc 775 int pam_code = PAM_SUCCESS;
9ba35398 776 int err;
5b6319dc
LP		 777 char **e = NULL;
778 bool close_session = false;
779 pid_t pam_pid = 0, parent_pid;
970edce6 780 int flags = 0;
5b6319dc
LP		 781
782 assert(name);
783 assert(user);
784 assert(pam_env);
785
786 /* We set up PAM in the parent process, then fork. The child
35b8ca3a 787 * will then stay around until killed via PR_GET_PDEATHSIG or
5b6319dc
LP		 788 * systemd via the cgroup logic. It will then remove the PAM
789 * session again. The parent process will exec() the actual
790 * daemon. We do things this way to ensure that the main PID
791 * of the daemon is the one we initially fork()ed. */
792
553d2243 793 if (log_get_max_level() < LOG_DEBUG)
970edce6
ZJS		 794 flags |= PAM_SILENT;
795
f546241b
ZJS		 796 pam_code = pam_start(name, user, &conv, &handle);
797 if (pam_code != PAM_SUCCESS) {
5b6319dc
LP		 798 handle = NULL;
799 goto fail;
800 }
801
f546241b
ZJS		 802 if (tty) {
803 pam_code = pam_set_item(handle, PAM_TTY, tty);
804 if (pam_code != PAM_SUCCESS)
5b6319dc 805 goto fail;
f546241b 806 }
5b6319dc 807
970edce6 808 pam_code = pam_acct_mgmt(handle, flags);
f546241b 809 if (pam_code != PAM_SUCCESS)
5b6319dc
LP		 810 goto fail;
811
970edce6 812 pam_code = pam_open_session(handle, flags);
f546241b 813 if (pam_code != PAM_SUCCESS)
5b6319dc
LP		 814 goto fail;
815
816 close_session = true;
817
f546241b
ZJS		 818 e = pam_getenvlist(handle);
819 if (!e) {
5b6319dc
LP		 820 pam_code = PAM_BUF_ERR;
821 goto fail;
822 }
823
824 /* Block SIGTERM, so that we know that it won't get lost in
825 * the child */
ce30c8dc 826
72c0a2c2 827 assert_se(sigprocmask_many(SIG_BLOCK, &old_ss, SIGTERM, -1) >= 0);
5b6319dc
LP		 828
829 parent_pid = getpid();
830
f546241b
ZJS		 831 pam_pid = fork();
832 if (pam_pid < 0)
5b6319dc
LP		 833 goto fail;
834
835 if (pam_pid == 0) {
836 int sig;
837 int r = EXIT_PAM;
838
839 /* The child's job is to reset the PAM session on
840 * termination */
841
842 /* This string must fit in 10 chars (i.e. the length
5d6b1584
LP		 843 * of "/sbin/init"), to look pretty in /bin/ps */
844 rename_process("(sd-pam)");
5b6319dc
LP		 845
846 /* Make sure we don't keep open the passed fds in this
847 child. We assume that otherwise only those fds are
848 open here that have been opened by PAM. */
849 close_many(fds, n_fds);
850
940c5210
AK		 851 /* Drop privileges - we don't need any to pam_close_session
852 * and this will make PR_SET_PDEATHSIG work in most cases.
853 * If this fails, ignore the error - but expect sd-pam threads
854 * to fail to exit normally */
855 if (setresuid(uid, uid, uid) < 0)
da927ba9 856 log_error_errno(r, "Error: Failed to setresuid() in sd-pam: %m");
940c5210 857
ce30c8dc
LP		 858 (void) ignore_signals(SIGPIPE, -1);
859
940c5210
AK		 860 /* Wait until our parent died. This will only work if
861 * the above setresuid() succeeds, otherwise the kernel
862 * will not allow unprivileged parents kill their privileged
863 * children this way. We rely on the control groups kill logic
5b6319dc
LP		 864 * to do the rest for us. */
865 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
866 goto child_finish;
867
868 /* Check if our parent process might already have
869 * died? */
870 if (getppid() == parent_pid) {
d6e5f3ad
DM		 871 sigset_t ss;
872
873 assert_se(sigemptyset(&ss) >= 0);
874 assert_se(sigaddset(&ss, SIGTERM) >= 0);
875
3dead8d9
LP		 876 for (;;) {
877 if (sigwait(&ss, &sig) < 0) {
878 if (errno == EINTR)
879 continue;
880
881 goto child_finish;
882 }
5b6319dc 883
3dead8d9
LP		 884 assert(sig == SIGTERM);
885 break;
886 }
5b6319dc
LP		 887 }
888
3dead8d9 889 /* If our parent died we'll end the session */
f546241b 890 if (getppid() != parent_pid) {
970edce6 891 pam_code = pam_close_session(handle, flags);
f546241b 892 if (pam_code != PAM_SUCCESS)
5b6319dc 893 goto child_finish;
f546241b 894 }
5b6319dc
LP		 895
896 r = 0;
897
898 child_finish:
970edce6 899 pam_end(handle, pam_code | flags);
5b6319dc
LP		 900 _exit(r);
901 }
902
903 /* If the child was forked off successfully it will do all the
904 * cleanups, so forget about the handle here. */
905 handle = NULL;
906
3b8bddde 907 /* Unblock SIGTERM again in the parent */
72c0a2c2 908 assert_se(sigprocmask(SIG_SETMASK, &old_ss, NULL) >= 0);
5b6319dc
LP		 909
910 /* We close the log explicitly here, since the PAM modules
911 * might have opened it, but we don't want this fd around. */
912 closelog();
913
aa87e624
LP		 914 *pam_env = e;
915 e = NULL;
916
5b6319dc
LP		 917 return 0;
918
919fail:
970edce6
ZJS		 920 if (pam_code != PAM_SUCCESS) {
921 log_error("PAM failed: %s", pam_strerror(handle, pam_code));
9ba35398 922 err = -EPERM; /* PAM errors do not map to errno */
970edce6 923 } else {
56f64d95 924 log_error_errno(errno, "PAM failed: %m");
9ba35398 925 err = -errno;
970edce6 926 }
9ba35398 927
5b6319dc
LP		 928 if (handle) {
929 if (close_session)
970edce6 930 pam_code = pam_close_session(handle, flags);
5b6319dc 931
970edce6 932 pam_end(handle, pam_code | flags);
5b6319dc
LP		 933 }
934
935 strv_free(e);
936
937 closelog();
938
430c18ed 939 if (pam_pid > 1) {
5b6319dc 940 kill(pam_pid, SIGTERM);
430c18ed
LP		 941 kill(pam_pid, SIGCONT);
942 }
5b6319dc 943
9ba35398 944 return err;
5b6319dc
LP		 945}
946#endif
947
5d6b1584
LP		 948static void rename_process_from_path(const char *path) {
949 char process_name[11];
950 const char *p;
951 size_t l;
952
953 /* This resulting string must fit in 10 chars (i.e. the length
954 * of "/sbin/init") to look pretty in /bin/ps */
955
2b6bf07d 956 p = basename(path);
5d6b1584
LP		 957 if (isempty(p)) {
958 rename_process("(...)");
959 return;
960 }
961
962 l = strlen(p);
963 if (l > 8) {
964 /* The end of the process name is usually more
965 * interesting, since the first bit might just be
966 * "systemd-" */
967 p = p + l - 8;
968 l = 8;
969 }
970
971 process_name[0] = '(';
972 memcpy(process_name+1, p, l);
973 process_name[1+l] = ')';
974 process_name[1+l+1] = 0;
975
976 rename_process(process_name);
977}
978
c0467cf3 979#ifdef HAVE_SECCOMP
17df7223 980
822a5960 981static int apply_seccomp(const ExecContext *c) {
17df7223
LP		 982 uint32_t negative_action, action;
983 scmp_filter_ctx *seccomp;
c0467cf3
RC		 984 Iterator i;
985 void *id;
17df7223 986 int r;
8351ceae 987
c0467cf3 988 assert(c);
8351ceae 989
17df7223
LP		 990 negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno);
991
992 seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW);
993 if (!seccomp)
994 return -ENOMEM;
8351ceae 995
e9642be2
LP		 996 if (c->syscall_archs) {
997
998 SET_FOREACH(id, c->syscall_archs, i) {
999 r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1);
1000 if (r == -EEXIST)
1001 continue;
7c66bae2
LP		 1002 if (r < 0)
1003 goto finish;
e9642be2 1004 }
e9642be2 1005
7c66bae2 1006 } else {
e9642be2 1007 r = seccomp_add_secondary_archs(seccomp);
7c66bae2
LP		 1008 if (r < 0)
1009 goto finish;
57183d11 1010 }
8351ceae 1011
57183d11 1012 action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action;
17df7223
LP		 1013 SET_FOREACH(id, c->syscall_filter, i) {
1014 r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0);
7c66bae2
LP		 1015 if (r < 0)
1016 goto finish;
c0467cf3 1017 }
8351ceae 1018
7c66bae2
LP		 1019 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
1020 if (r < 0)
1021 goto finish;
1022
17df7223 1023 r = seccomp_load(seccomp);
7c66bae2
LP		 1024
1025finish:
17df7223 1026 seccomp_release(seccomp);
4298d0b5
LP		 1027 return r;
1028}
1029
822a5960 1030static int apply_address_families(const ExecContext *c) {
4298d0b5
LP		 1031 scmp_filter_ctx *seccomp;
1032 Iterator i;
1033 int r;
1034
1035 assert(c);
1036
1037 seccomp = seccomp_init(SCMP_ACT_ALLOW);
1038 if (!seccomp)
1039 return -ENOMEM;
1040
1041 r = seccomp_add_secondary_archs(seccomp);
1042 if (r < 0)
1043 goto finish;
1044
1045 if (c->address_families_whitelist) {
1046 int af, first = 0, last = 0;
1047 void *afp;
1048
1049 /* If this is a whitelist, we first block the address
1050 * families that are out of range and then everything
1051 * that is not in the set. First, we find the lowest
1052 * and highest address family in the set. */
1053
1054 SET_FOREACH(afp, c->address_families, i) {
1055 af = PTR_TO_INT(afp);
17df7223 1056
4298d0b5
LP		 1057 if (af <= 0 || af >= af_max())
1058 continue;
1059
1060 if (first == 0 || af < first)
1061 first = af;
1062
1063 if (last == 0 || af > last)
1064 last = af;
1065 }
1066
1067 assert((first == 0) == (last == 0));
1068
1069 if (first == 0) {
1070
1071 /* No entries in the valid range, block everything */
1072 r = seccomp_rule_add(
1073 seccomp,
1074 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1075 SCMP_SYS(socket),
1076 0);
1077 if (r < 0)
1078 goto finish;
1079
1080 } else {
1081
1082 /* Block everything below the first entry */
1083 r = seccomp_rule_add(
1084 seccomp,
1085 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1086 SCMP_SYS(socket),
1087 1,
1088 SCMP_A0(SCMP_CMP_LT, first));
1089 if (r < 0)
1090 goto finish;
1091
1092 /* Block everything above the last entry */
1093 r = seccomp_rule_add(
1094 seccomp,
1095 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1096 SCMP_SYS(socket),
1097 1,
1098 SCMP_A0(SCMP_CMP_GT, last));
1099 if (r < 0)
1100 goto finish;
1101
1102 /* Block everything between the first and last
1103 * entry */
1104 for (af = 1; af < af_max(); af++) {
1105
1106 if (set_contains(c->address_families, INT_TO_PTR(af)))
1107 continue;
1108
1109 r = seccomp_rule_add(
1110 seccomp,
1111 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1112 SCMP_SYS(socket),
1113 1,
1114 SCMP_A0(SCMP_CMP_EQ, af));
1115 if (r < 0)
1116 goto finish;
1117 }
1118 }
1119
1120 } else {
1121 void *af;
1122
1123 /* If this is a blacklist, then generate one rule for
1124 * each address family that are then combined in OR
1125 * checks. */
1126
1127 SET_FOREACH(af, c->address_families, i) {
1128
1129 r = seccomp_rule_add(
1130 seccomp,
1131 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1132 SCMP_SYS(socket),
1133 1,
1134 SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af)));
1135 if (r < 0)
1136 goto finish;
1137 }
1138 }
1139
1140 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
1141 if (r < 0)
1142 goto finish;
1143
1144 r = seccomp_load(seccomp);
1145
1146finish:
1147 seccomp_release(seccomp);
17df7223 1148 return r;
8351ceae 1149}
4298d0b5 1150
c0467cf3 1151#endif
8351ceae 1152
31a7eb86
ZJS		 1153static void do_idle_pipe_dance(int idle_pipe[4]) {
1154 assert(idle_pipe);
1155
03e334a1
LP		 1156
1157 safe_close(idle_pipe[1]);
1158 safe_close(idle_pipe[2]);
31a7eb86
ZJS		 1159
1160 if (idle_pipe[0] >= 0) {
1161 int r;
1162
1163 r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC);
1164
1165 if (idle_pipe[3] >= 0 && r == 0 /* timeout */) {
1166 /* Signal systemd that we are bored and want to continue. */
cd972d69
ZJS		 1167 r = write(idle_pipe[3], "x", 1);
1168 if (r > 0)
1169 /* Wait for systemd to react to the signal above. */
1170 fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC);
31a7eb86
ZJS		 1171 }
1172
03e334a1 1173 safe_close(idle_pipe[0]);
31a7eb86
ZJS		 1174
1175 }
1176
03e334a1 1177 safe_close(idle_pipe[3]);
31a7eb86
ZJS		 1178}
1179
7cae38c4 1180static int build_environment(
9fa95f85 1181 const ExecContext *c,
7cae38c4 1182 unsigned n_fds,
09812eb7 1183 usec_t watchdog_usec,
7cae38c4
LP		 1184 const char *home,
1185 const char *username,
1186 const char *shell,
1187 char ***ret) {
1188
1189 _cleanup_strv_free_ char **our_env = NULL;
1190 unsigned n_env = 0;
1191 char *x;
1192
1193 assert(c);
1194 assert(ret);
1195
09812eb7 1196 our_env = new0(char*, 10);
7cae38c4
LP		 1197 if (!our_env)
1198 return -ENOMEM;
1199
1200 if (n_fds > 0) {
ccd06097 1201 if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0)
7cae38c4
LP		 1202 return -ENOMEM;
1203 our_env[n_env++] = x;
1204
1205 if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0)
1206 return -ENOMEM;
1207 our_env[n_env++] = x;
1208 }
1209
09812eb7 1210 if (watchdog_usec > 0) {
ccd06097 1211 if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0)
09812eb7
LP		 1212 return -ENOMEM;
1213 our_env[n_env++] = x;
1214
de0671ee 1215 if (asprintf(&x, "WATCHDOG_USEC="USEC_FMT, watchdog_usec) < 0)
09812eb7
LP		 1216 return -ENOMEM;
1217 our_env[n_env++] = x;
1218 }
1219
7cae38c4
LP		 1220 if (home) {
1221 x = strappend("HOME=", home);
1222 if (!x)
1223 return -ENOMEM;
1224 our_env[n_env++] = x;
1225 }
1226
1227 if (username) {
1228 x = strappend("LOGNAME=", username);
1229 if (!x)
1230 return -ENOMEM;
1231 our_env[n_env++] = x;
1232
1233 x = strappend("USER=", username);
1234 if (!x)
1235 return -ENOMEM;
1236 our_env[n_env++] = x;
1237 }
1238
1239 if (shell) {
1240 x = strappend("SHELL=", shell);
1241 if (!x)
1242 return -ENOMEM;
1243 our_env[n_env++] = x;
1244 }
1245
1246 if (is_terminal_input(c->std_input) ||
1247 c->std_output == EXEC_OUTPUT_TTY ||
1248 c->std_error == EXEC_OUTPUT_TTY ||
1249 c->tty_path) {
1250
1251 x = strdup(default_term_for_tty(tty_path(c)));
1252 if (!x)
1253 return -ENOMEM;
1254 our_env[n_env++] = x;
1255 }
1256
1257 our_env[n_env++] = NULL;
09812eb7 1258 assert(n_env <= 10);
7cae38c4
LP		 1259
1260 *ret = our_env;
1261 our_env = NULL;
1262
1263 return 0;
1264}
1265
8b44a3d2
LP		 1266static bool exec_needs_mount_namespace(
1267 const ExecContext *context,
1268 const ExecParameters *params,
1269 ExecRuntime *runtime) {
1270
1271 assert(context);
1272 assert(params);
1273
1274 if (!strv_isempty(context->read_write_dirs) ||
1275 !strv_isempty(context->read_only_dirs) ||
1276 !strv_isempty(context->inaccessible_dirs))
1277 return true;
1278
1279 if (context->mount_flags != 0)
1280 return true;
1281
1282 if (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir))
1283 return true;
1284
1285 if (params->bus_endpoint_path)
1286 return true;
1287
1288 if (context->private_devices ||
1289 context->protect_system != PROTECT_SYSTEM_NO ||
1290 context->protect_home != PROTECT_HOME_NO)
1291 return true;
1292
1293 return false;
1294}
1295
ff0af2a1 1296static int exec_child(
f2341e0a 1297 Unit *unit,
ff0af2a1
LP		 1298 ExecCommand *command,
1299 const ExecContext *context,
1300 const ExecParameters *params,
1301 ExecRuntime *runtime,
1302 char **argv,
1303 int socket_fd,
1304 int *fds, unsigned n_fds,
1305 char **files_env,
1306 int *exit_status) {
d35fbf6b
DM		 1307
1308 _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
9008e1ac 1309 _cleanup_free_ char *mac_selinux_context_net = NULL;
d35fbf6b
DM		 1310 const char *username = NULL, *home = NULL, *shell = NULL;
1311 unsigned n_dont_close = 0;
e44da745 1312 int dont_close[n_fds + 4];
fed1e721
LP		 1313 uid_t uid = UID_INVALID;
1314 gid_t gid = GID_INVALID;
ff0af2a1 1315 int i, r;
ee818b89 1316 bool needs_mount_namespace;
034c6ed7 1317
f2341e0a 1318 assert(unit);
5cb5a6ff
LP		 1319 assert(command);
1320 assert(context);
d35fbf6b 1321 assert(params);
ff0af2a1 1322 assert(exit_status);
d35fbf6b
DM		 1323
1324 rename_process_from_path(command->path);
1325
1326 /* We reset exactly these signals, since they are the
1327 * only ones we set to SIG_IGN in the main daemon. All
1328 * others we leave untouched because we set them to
1329 * SIG_DFL or a valid handler initially, both of which
1330 * will be demoted to SIG_DFL. */
ce30c8dc
LP		 1331 (void) default_signals(SIGNALS_CRASH_HANDLER,
1332 SIGNALS_IGNORE, -1);
d35fbf6b
DM		 1333
1334 if (context->ignore_sigpipe)
ce30c8dc 1335 (void) ignore_signals(SIGPIPE, -1);
d35fbf6b 1336
ff0af2a1
LP		 1337 r = reset_signal_mask();
1338 if (r < 0) {
1339 *exit_status = EXIT_SIGNAL_MASK;
1340 return r;
d35fbf6b 1341 }
034c6ed7 1342
d35fbf6b
DM		 1343 if (params->idle_pipe)
1344 do_idle_pipe_dance(params->idle_pipe);
4f2d528d 1345
d35fbf6b
DM		 1346 /* Close sockets very early to make sure we don't
1347 * block init reexecution because it cannot bind its
1348 * sockets */
ff0af2a1 1349
d35fbf6b 1350 log_forget_fds();
4f2d528d 1351
d35fbf6b
DM		 1352 if (socket_fd >= 0)
1353 dont_close[n_dont_close++] = socket_fd;
1354 if (n_fds > 0) {
1355 memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds);
1356 n_dont_close += n_fds;
1357 }
e44da745
DM		 1358 if (params->bus_endpoint_fd >= 0)
1359 dont_close[n_dont_close++] = params->bus_endpoint_fd;
d35fbf6b
DM		 1360 if (runtime) {
1361 if (runtime->netns_storage_socket[0] >= 0)
1362 dont_close[n_dont_close++] = runtime->netns_storage_socket[0];
1363 if (runtime->netns_storage_socket[1] >= 0)
1364 dont_close[n_dont_close++] = runtime->netns_storage_socket[1];
9fa95f85 1365 }
4f2d528d 1366
ff0af2a1
LP		 1367 r = close_all_fds(dont_close, n_dont_close);
1368 if (r < 0) {
1369 *exit_status = EXIT_FDS;
1370 return r;
8c7be95e
LP		 1371 }
1372
d35fbf6b
DM		 1373 if (!context->same_pgrp)
1374 if (setsid() < 0) {
ff0af2a1 1375 *exit_status = EXIT_SETSID;
d35fbf6b
DM		 1376 return -errno;
1377 }
9e2f7c11 1378
d35fbf6b
DM		 1379 exec_context_tty_reset(context);
1380
1381 if (params->confirm_spawn) {
1382 char response;
1383
ff0af2a1
LP		 1384 r = ask_for_confirmation(&response, argv);
1385 if (r == -ETIMEDOUT)
d35fbf6b 1386 write_confirm_message("Confirmation question timed out, assuming positive response.\n");
ff0af2a1
LP		 1387 else if (r < 0)
1388 write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-r));
d35fbf6b
DM		 1389 else if (response == 's') {
1390 write_confirm_message("Skipping execution.\n");
ff0af2a1 1391 *exit_status = EXIT_CONFIRM;
d35fbf6b
DM		 1392 return -ECANCELED;
1393 } else if (response == 'n') {
1394 write_confirm_message("Failing execution.\n");
ff0af2a1 1395 *exit_status = 0;
d35fbf6b
DM		 1396 return 0;
1397 }
1398 }
1a63a750 1399
524daa8c
ZJS		 1400 if (context->user) {
1401 username = context->user;
ff0af2a1
LP		 1402 r = get_user_creds(&username, &uid, &gid, &home, &shell);
1403 if (r < 0) {
1404 *exit_status = EXIT_USER;
1405 return r;
524daa8c
ZJS		 1406 }
1407 }
1408
d35fbf6b
DM		 1409 /* If a socket is connected to STDIN/STDOUT/STDERR, we
1410 * must sure to drop O_NONBLOCK */
1411 if (socket_fd >= 0)
1412 fd_nonblock(socket_fd, false);
acbb0225 1413
ff0af2a1
LP		 1414 r = setup_input(context, socket_fd, params->apply_tty_stdin);
1415 if (r < 0) {
1416 *exit_status = EXIT_STDIN;
1417 return r;
d35fbf6b 1418 }
034c6ed7 1419
f2341e0a 1420 r = setup_output(unit, context, STDOUT_FILENO, socket_fd, basename(command->path), params->apply_tty_stdin, uid, gid);
ff0af2a1
LP		 1421 if (r < 0) {
1422 *exit_status = EXIT_STDOUT;
1423 return r;
d35fbf6b
DM		 1424 }
1425
f2341e0a 1426 r = setup_output(unit, context, STDERR_FILENO, socket_fd, basename(command->path), params->apply_tty_stdin, uid, gid);
ff0af2a1
LP		 1427 if (r < 0) {
1428 *exit_status = EXIT_STDERR;
1429 return r;
d35fbf6b
DM		 1430 }
1431
1432 if (params->cgroup_path) {
ff0af2a1
LP		 1433 r = cg_attach_everywhere(params->cgroup_supported, params->cgroup_path, 0, NULL, NULL);
1434 if (r < 0) {
1435 *exit_status = EXIT_CGROUP;
1436 return r;
309bff19 1437 }
d35fbf6b 1438 }
309bff19 1439
d35fbf6b 1440 if (context->oom_score_adjust_set) {
d5243d62 1441 char t[DECIMAL_STR_MAX(context->oom_score_adjust)];
f2b68789 1442
d5243d62
LP		 1443 /* When we can't make this change due to EPERM, then
1444 * let's silently skip over it. User namespaces
1445 * prohibit write access to this file, and we
1446 * shouldn't trip up over that. */
613b411c 1447
d5243d62 1448 sprintf(t, "%i", context->oom_score_adjust);
ad118bda 1449 r = write_string_file("/proc/self/oom_score_adj", t, 0);
6cb7fa17 1450 if (r == -EPERM || r == -EACCES) {
ff0af2a1 1451 log_open();
f2341e0a 1452 log_unit_debug_errno(unit, r, "Failed to adjust OOM setting, assuming containerized execution, ignoring: %m");
ff0af2a1
LP		 1453 log_close();
1454 } else if (r < 0) {
1455 *exit_status = EXIT_OOM_ADJUST;
d35fbf6b 1456 return -errno;
613b411c 1457 }
d35fbf6b
DM		 1458 }
1459
1460 if (context->nice_set)
1461 if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
ff0af2a1 1462 *exit_status = EXIT_NICE;
d35fbf6b 1463 return -errno;
613b411c
LP		 1464 }
1465
d35fbf6b
DM		 1466 if (context->cpu_sched_set) {
1467 struct sched_param param = {
1468 .sched_priority = context->cpu_sched_priority,
1469 };
1470
ff0af2a1
LP		 1471 r = sched_setscheduler(0,
1472 context->cpu_sched_policy |
1473 (context->cpu_sched_reset_on_fork ?
1474 SCHED_RESET_ON_FORK : 0),
1475 &param);
1476 if (r < 0) {
1477 *exit_status = EXIT_SETSCHEDULER;
d35fbf6b 1478 return -errno;
fc9b2a84 1479 }
d35fbf6b 1480 }
fc9b2a84 1481
d35fbf6b
DM		 1482 if (context->cpuset)
1483 if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
ff0af2a1 1484 *exit_status = EXIT_CPUAFFINITY;
d35fbf6b 1485 return -errno;
034c6ed7
LP		 1486 }
1487
d35fbf6b
DM		 1488 if (context->ioprio_set)
1489 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
ff0af2a1 1490 *exit_status = EXIT_IOPRIO;
d35fbf6b
DM		 1491 return -errno;
1492 }
da726a4d 1493
d35fbf6b
DM		 1494 if (context->timer_slack_nsec != NSEC_INFINITY)
1495 if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
ff0af2a1 1496 *exit_status = EXIT_TIMERSLACK;
d35fbf6b 1497 return -errno;
4c2630eb 1498 }
9eba9da4 1499
050f7277 1500 if (context->personality != PERSONALITY_INVALID)
d35fbf6b 1501 if (personality(context->personality) < 0) {
ff0af2a1 1502 *exit_status = EXIT_PERSONALITY;
d35fbf6b 1503 return -errno;
4c2630eb 1504 }
94f04347 1505
d35fbf6b
DM		 1506 if (context->utmp_id)
1507 utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path);
1508
524daa8c 1509 if (context->user && is_terminal_input(context->std_input)) {
ff0af2a1
LP		 1510 r = chown_terminal(STDIN_FILENO, uid);
1511 if (r < 0) {
1512 *exit_status = EXIT_STDIN;
1513 return r;
071830ff 1514 }
d35fbf6b 1515 }
8e274523 1516
e44da745 1517 if (params->bus_endpoint_fd >= 0 && context->bus_endpoint) {
fed1e721 1518 uid_t ep_uid = (uid == UID_INVALID) ? 0 : uid;
e44da745 1519
ff0af2a1
LP		 1520 r = bus_kernel_set_endpoint_policy(params->bus_endpoint_fd, ep_uid, context->bus_endpoint);
1521 if (r < 0) {
1522 *exit_status = EXIT_BUS_ENDPOINT;
1523 return r;
e44da745
DM		 1524 }
1525 }
e44da745 1526
a931ad47
LP		 1527 /* If delegation is enabled we'll pass ownership of the cgroup
1528 * (but only in systemd's own controller hierarchy!) to the
1529 * user of the new process. */
1530 if (params->cgroup_path && context->user && params->cgroup_delegate) {
ff0af2a1
LP		 1531 r = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0644, uid, gid);
1532 if (r < 0) {
1533 *exit_status = EXIT_CGROUP;
1534 return r;
d35fbf6b 1535 }
034c6ed7 1536
034c6ed7 1537
ff0af2a1
LP		 1538 r = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0755, uid, gid);
1539 if (r < 0) {
1540 *exit_status = EXIT_CGROUP;
1541 return r;
034c6ed7 1542 }
d35fbf6b 1543 }
034c6ed7 1544
d35fbf6b
DM		 1545 if (!strv_isempty(context->runtime_directory) && params->runtime_prefix) {
1546 char **rt;
fb33a393 1547
d35fbf6b
DM		 1548 STRV_FOREACH(rt, context->runtime_directory) {
1549 _cleanup_free_ char *p;
94f04347 1550
d35fbf6b
DM		 1551 p = strjoin(params->runtime_prefix, "/", *rt, NULL);
1552 if (!p) {
ff0af2a1 1553 *exit_status = EXIT_RUNTIME_DIRECTORY;
d35fbf6b 1554 return -ENOMEM;
94f04347 1555 }
94f04347 1556
ca905b2f 1557 r = mkdir_safe_label(p, context->runtime_directory_mode, uid, gid);
ff0af2a1
LP		 1558 if (r < 0) {
1559 *exit_status = EXIT_RUNTIME_DIRECTORY;
1560 return r;
94f04347 1561 }
d35fbf6b
DM		 1562 }
1563 }
94f04347 1564
d35fbf6b 1565 if (params->apply_permissions) {
ff0af2a1
LP		 1566 r = enforce_groups(context, username, gid);
1567 if (r < 0) {
1568 *exit_status = EXIT_GROUP;
1569 return r;
d35fbf6b
DM		 1570 }
1571 }
9eba9da4 1572
d35fbf6b 1573 umask(context->umask);
94f04347 1574
d35fbf6b
DM		 1575#ifdef HAVE_PAM
1576 if (params->apply_permissions && context->pam_name && username) {
ff0af2a1
LP		 1577 r = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds);
1578 if (r < 0) {
1579 *exit_status = EXIT_PAM;
1580 return r;
d35fbf6b
DM		 1581 }
1582 }
1583#endif
ac45f971 1584
d35fbf6b 1585 if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) {
ff0af2a1
LP		 1586 r = setup_netns(runtime->netns_storage_socket);
1587 if (r < 0) {
1588 *exit_status = EXIT_NETWORK;
1589 return r;
d35fbf6b
DM		 1590 }
1591 }
169c1bda 1592
ee818b89
AC		 1593 needs_mount_namespace = exec_needs_mount_namespace(context, params, runtime);
1594
1595 if (needs_mount_namespace) {
d35fbf6b
DM		 1596 char *tmp = NULL, *var = NULL;
1597
1598 /* The runtime struct only contains the parent
1599 * of the private /tmp, which is
1600 * non-accessible to world users. Inside of it
1601 * there's a /tmp that is sticky, and that's
1602 * the one we want to use here. */
1603
1604 if (context->private_tmp && runtime) {
1605 if (runtime->tmp_dir)
63c372cb 1606 tmp = strjoina(runtime->tmp_dir, "/tmp");
d35fbf6b 1607 if (runtime->var_tmp_dir)
63c372cb 1608 var = strjoina(runtime->var_tmp_dir, "/tmp");
d35fbf6b 1609 }
d8b4e2e9 1610
ff0af2a1 1611 r = setup_namespace(
ee818b89 1612 params->apply_chroot ? context->root_directory : NULL,
d35fbf6b
DM		 1613 context->read_write_dirs,
1614 context->read_only_dirs,
1615 context->inaccessible_dirs,
1616 tmp,
1617 var,
e44da745 1618 params->bus_endpoint_path,
d35fbf6b
DM		 1619 context->private_devices,
1620 context->protect_home,
1621 context->protect_system,
1622 context->mount_flags);
0015ebf3 1623
ff0af2a1
LP		 1624 /* If we couldn't set up the namespace this is
1625 * probably due to a missing capability. In this case,
1626 * silently proceeed. */
1627 if (r == -EPERM || r == -EACCES) {
1628 log_open();
f2341e0a 1629 log_unit_debug_errno(unit, r, "Failed to set up namespace, assuming containerized execution, ignoring: %m");
ff0af2a1
LP		 1630 log_close();
1631 } else if (r < 0) {
1632 *exit_status = EXIT_NAMESPACE;
1633 return r;
81a2b7ce 1634 }
d35fbf6b 1635 }
81a2b7ce 1636
d35fbf6b 1637 if (params->apply_chroot) {
ee818b89 1638 if (!needs_mount_namespace && context->root_directory)
d35fbf6b 1639 if (chroot(context->root_directory) < 0) {
ff0af2a1 1640 *exit_status = EXIT_CHROOT;
d35fbf6b 1641 return -errno;
8aa75193
LP		 1642 }
1643
4c08c824
LP		 1644 if (chdir(context->working_directory ?: "/") < 0 &&
1645 !context->working_directory_missing_ok) {
ff0af2a1 1646 *exit_status = EXIT_CHDIR;
d35fbf6b
DM		 1647 return -errno;
1648 }
1649 } else {
1650 _cleanup_free_ char *d = NULL;
8aa75193 1651
d35fbf6b 1652 if (asprintf(&d, "%s/%s",
cf1d0302
LP		 1653 context->root_directory ?: "",
1654 context->working_directory ?: "") < 0) {
ff0af2a1 1655 *exit_status = EXIT_MEMORY;
d35fbf6b 1656 return -ENOMEM;
8aa75193 1657 }
8aa75193 1658
cf1d0302
LP		 1659 if (chdir(d) < 0 &&
1660 !context->working_directory_missing_ok) {
ff0af2a1 1661 *exit_status = EXIT_CHDIR;
d35fbf6b
DM		 1662 return -errno;
1663 }
1664 }
e66cf1a3 1665
9008e1ac
MS		 1666#ifdef HAVE_SELINUX
1667 if (params->apply_permissions && mac_selinux_use() && params->selinux_context_net && socket_fd >= 0) {
ff0af2a1
LP		 1668 r = mac_selinux_get_child_mls_label(socket_fd, command->path, context->selinux_context, &mac_selinux_context_net);
1669 if (r < 0) {
1670 *exit_status = EXIT_SELINUX_CONTEXT;
1671 return r;
9008e1ac
MS		 1672 }
1673 }
1674#endif
1675
d35fbf6b
DM		 1676 /* We repeat the fd closing here, to make sure that
1677 * nothing is leaked from the PAM modules. Note that
1678 * we are more aggressive this time since socket_fd
e44da745
DM		 1679 * and the netns fds we don't need anymore. The custom
1680 * endpoint fd was needed to upload the policy and can
1681 * now be closed as well. */
ff0af2a1
LP		 1682 r = close_all_fds(fds, n_fds);
1683 if (r >= 0)
1684 r = shift_fds(fds, n_fds);
1685 if (r >= 0)
1686 r = flags_fds(fds, n_fds, context->non_blocking);
1687 if (r < 0) {
1688 *exit_status = EXIT_FDS;
1689 return r;
d35fbf6b 1690 }
e66cf1a3 1691
d35fbf6b 1692 if (params->apply_permissions) {
e66cf1a3 1693
d35fbf6b
DM		 1694 for (i = 0; i < _RLIMIT_MAX; i++) {
1695 if (!context->rlimit[i])
1696 continue;
1697
1698 if (setrlimit_closest(i, context->rlimit[i]) < 0) {
ff0af2a1 1699 *exit_status = EXIT_LIMITS;
d35fbf6b 1700 return -errno;
e66cf1a3
LP		 1701 }
1702 }
1703
d35fbf6b 1704 if (context->capability_bounding_set_drop) {
ff0af2a1
LP		 1705 r = capability_bounding_set_drop(context->capability_bounding_set_drop, false);
1706 if (r < 0) {
1707 *exit_status = EXIT_CAPABILITIES;
1708 return r;
3b8bddde 1709 }
4c2630eb 1710 }
3b8bddde 1711
2ca620c4
WC		 1712#ifdef HAVE_SMACK
1713 if (context->smack_process_label) {
ff0af2a1
LP		 1714 r = mac_smack_apply_pid(0, context->smack_process_label);
1715 if (r < 0) {
1716 *exit_status = EXIT_SMACK_PROCESS_LABEL;
1717 return r;
2ca620c4
WC		 1718 }
1719 }
e174dce2
WC		 1720#ifdef SMACK_DEFAULT_PROCESS_LABEL
1721 else {
e419a0e3
WC		 1722 _cleanup_free_ char *exec_label = NULL;
1723
1724 r = mac_smack_read(command->path, SMACK_ATTR_EXEC, &exec_label);
1725 if (r < 0 && r != -ENODATA && r != -EOPNOTSUPP) {
1726 *exit_status = EXIT_SMACK_PROCESS_LABEL;
1727 return r;
1728 }
1729
1730 r = mac_smack_apply_pid(0, exec_label ? : SMACK_DEFAULT_PROCESS_LABEL);
e174dce2
WC		 1731 if (r < 0) {
1732 *exit_status = EXIT_SMACK_PROCESS_LABEL;
1733 return r;
1734 }
1735 }
1736#endif
2ca620c4
WC		 1737#endif
1738
d35fbf6b 1739 if (context->user) {
ff0af2a1
LP		 1740 r = enforce_user(context, uid);
1741 if (r < 0) {
1742 *exit_status = EXIT_USER;
1743 return r;
5b6319dc
LP		 1744 }
1745 }
d35fbf6b
DM		 1746
1747 /* PR_GET_SECUREBITS is not privileged, while
1748 * PR_SET_SECUREBITS is. So to suppress
1749 * potential EPERMs we'll try not to call
1750 * PR_SET_SECUREBITS unless necessary. */
1751 if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
1752 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
ff0af2a1 1753 *exit_status = EXIT_SECUREBITS;
d35fbf6b 1754 return -errno;
ff01d048 1755 }
5b6319dc 1756
d35fbf6b
DM		 1757 if (context->capabilities)
1758 if (cap_set_proc(context->capabilities) < 0) {
ff0af2a1 1759 *exit_status = EXIT_CAPABILITIES;
d35fbf6b 1760 return -errno;
613b411c
LP		 1761 }
1762
d35fbf6b
DM		 1763 if (context->no_new_privileges)
1764 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
ff0af2a1 1765 *exit_status = EXIT_NO_NEW_PRIVILEGES;
d35fbf6b
DM		 1766 return -errno;
1767 }
1768
1769#ifdef HAVE_SECCOMP
1770 if (context->address_families_whitelist ||
1771 !set_isempty(context->address_families)) {
ff0af2a1
LP		 1772 r = apply_address_families(context);
1773 if (r < 0) {
1774 *exit_status = EXIT_ADDRESS_FAMILIES;
1775 return r;
4c2630eb
MS		 1776 }
1777 }
04aa0cb9 1778
d35fbf6b
DM		 1779 if (context->syscall_whitelist ||
1780 !set_isempty(context->syscall_filter) ||
1781 !set_isempty(context->syscall_archs)) {
ff0af2a1
LP		 1782 r = apply_seccomp(context);
1783 if (r < 0) {
1784 *exit_status = EXIT_SECCOMP;
1785 return r;
81a2b7ce 1786 }
d35fbf6b
DM		 1787 }
1788#endif
81a2b7ce 1789
d35fbf6b 1790#ifdef HAVE_SELINUX
6baa7db0 1791 if (mac_selinux_use()) {
9008e1ac 1792 char *exec_context = mac_selinux_context_net ?: context->selinux_context;
16115b0a 1793
9008e1ac 1794 if (exec_context) {
ff0af2a1
LP		 1795 r = setexeccon(exec_context);
1796 if (r < 0) {
1797 *exit_status = EXIT_SELINUX_CONTEXT;
1798 return r;
16115b0a 1799 }
81a2b7ce 1800 }
81a2b7ce 1801 }
d35fbf6b 1802#endif
81a2b7ce 1803
d35fbf6b 1804#ifdef HAVE_APPARMOR
6baa7db0 1805 if (context->apparmor_profile && mac_apparmor_use()) {
ff0af2a1
LP		 1806 r = aa_change_onexec(context->apparmor_profile);
1807 if (r < 0 && !context->apparmor_profile_ignore) {
1808 *exit_status = EXIT_APPARMOR_PROFILE;
5482192e 1809 return -errno;
d35fbf6b 1810 }
034c6ed7 1811 }
d35fbf6b
DM		 1812#endif
1813 }
034c6ed7 1814
ff0af2a1
LP		 1815 r = build_environment(context, n_fds, params->watchdog_usec, home, username, shell, &our_env);
1816 if (r < 0) {
1817 *exit_status = EXIT_MEMORY;
1818 return r;
d35fbf6b 1819 }
034c6ed7 1820
d35fbf6b
DM		 1821 final_env = strv_env_merge(5,
1822 params->environment,
1823 our_env,
1824 context->environment,
1825 files_env,
1826 pam_env,
1827 NULL);
1828 if (!final_env) {
ff0af2a1 1829 *exit_status = EXIT_MEMORY;
d35fbf6b
DM		 1830 return -ENOMEM;
1831 }
81a2b7ce 1832
d35fbf6b
DM		 1833 final_argv = replace_env_argv(argv, final_env);
1834 if (!final_argv) {
ff0af2a1 1835 *exit_status = EXIT_MEMORY;
d35fbf6b
DM		 1836 return -ENOMEM;
1837 }
034c6ed7 1838
d35fbf6b 1839 final_env = strv_env_clean(final_env);
260abb78 1840
553d2243 1841 if (_unlikely_(log_get_max_level() >= LOG_DEBUG)) {
d35fbf6b 1842 _cleanup_free_ char *line;
81a2b7ce 1843
d35fbf6b
DM		 1844 line = exec_command_line(final_argv);
1845 if (line) {
1846 log_open();
f2341e0a
LP		 1847 log_struct(LOG_DEBUG,
1848 LOG_UNIT_ID(unit),
1849 "EXECUTABLE=%s", command->path,
1850 LOG_UNIT_MESSAGE(unit, "Executing: %s", line),
1851 NULL);
d35fbf6b
DM		 1852 log_close();
1853 }
1854 }
dd305ec9 1855
d35fbf6b 1856 execve(command->path, final_argv, final_env);
ff0af2a1 1857 *exit_status = EXIT_EXEC;
d35fbf6b
DM		 1858 return -errno;
1859}
81a2b7ce 1860
f2341e0a
LP		 1861int exec_spawn(Unit *unit,
1862 ExecCommand *command,
d35fbf6b
DM		 1863 const ExecContext *context,
1864 const ExecParameters *params,
1865 ExecRuntime *runtime,
1866 pid_t *ret) {
8351ceae 1867
d35fbf6b
DM		 1868 _cleanup_strv_free_ char **files_env = NULL;
1869 int *fds = NULL; unsigned n_fds = 0;
ff0af2a1
LP		 1870 _cleanup_free_ char *line = NULL;
1871 int socket_fd, r;
1872 char **argv;
d35fbf6b 1873 pid_t pid;
8351ceae 1874
f2341e0a 1875 assert(unit);
d35fbf6b
DM		 1876 assert(command);
1877 assert(context);
1878 assert(ret);
1879 assert(params);
1880 assert(params->fds || params->n_fds <= 0);
4298d0b5 1881
d35fbf6b
DM		 1882 if (context->std_input == EXEC_INPUT_SOCKET ||
1883 context->std_output == EXEC_OUTPUT_SOCKET ||
1884 context->std_error == EXEC_OUTPUT_SOCKET) {
17df7223 1885
ff0af2a1 1886 if (params->n_fds != 1) {
f2341e0a 1887 log_unit_error(unit, "Got more than one socket.");
d35fbf6b 1888 return -EINVAL;
ff0af2a1 1889 }
eef65bf3 1890
d35fbf6b
DM		 1891 socket_fd = params->fds[0];
1892 } else {
1893 socket_fd = -1;
1894 fds = params->fds;
1895 n_fds = params->n_fds;
1896 }
94f04347 1897
f2341e0a 1898 r = exec_context_load_environment(unit, context, &files_env);
ff0af2a1 1899 if (r < 0)
f2341e0a 1900 return log_unit_error_errno(unit, r, "Failed to load environment files: %m");
034c6ed7 1901
d35fbf6b 1902 argv = params->argv ?: command->argv;
d35fbf6b
DM		 1903 line = exec_command_line(argv);
1904 if (!line)
1905 return log_oom();
fab56fc5 1906
f2341e0a
LP		 1907 log_struct(LOG_DEBUG,
1908 LOG_UNIT_ID(unit),
1909 LOG_UNIT_MESSAGE(unit, "About to execute: %s", line),
1910 "EXECUTABLE=%s", command->path,
1911 NULL);
d35fbf6b
DM		 1912 pid = fork();
1913 if (pid < 0)
f2341e0a 1914 return log_unit_error_errno(unit, r, "Failed to fork: %m");
d35fbf6b
DM		 1915
1916 if (pid == 0) {
ff0af2a1
LP		 1917 int exit_status;
1918
f2341e0a
LP		 1919 r = exec_child(unit,
1920 command,
ff0af2a1
LP		 1921 context,
1922 params,
1923 runtime,
1924 argv,
1925 socket_fd,
1926 fds, n_fds,
1927 files_env,
1928 &exit_status);
1929 if (r < 0) {
4c2630eb 1930 log_open();
f2341e0a
LP		 1931 log_struct_errno(LOG_ERR, r,
1932 LOG_MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED),
1933 LOG_UNIT_ID(unit),
1934 LOG_UNIT_MESSAGE(unit, "Failed at step %s spawning %s: %m",
1935 exit_status_to_string(exit_status, EXIT_STATUS_SYSTEMD),
1936 command->path),
1937 "EXECUTABLE=%s", command->path,
1938 NULL);
4c2630eb
MS		 1939 }
1940
ff0af2a1 1941 _exit(exit_status);
034c6ed7
LP		 1942 }
1943
f2341e0a 1944 log_unit_debug(unit, "Forked %s as "PID_FMT, command->path, pid);
23635a85 1945
80876c20
LP		 1946 /* We add the new process to the cgroup both in the child (so
1947 * that we can be sure that no user code is ever executed
1948 * outside of the cgroup) and in the parent (so that we can be
1949 * sure that when we kill the cgroup the process will be
1950 * killed too). */
d35fbf6b 1951 if (params->cgroup_path)
dd305ec9 1952 (void) cg_attach(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, pid);
2da3263a 1953
b58b4116 1954 exec_status_start(&command->exec_status, pid);
9fb86720 1955
034c6ed7 1956 *ret = pid;
5cb5a6ff
LP		 1957 return 0;
1958}
1959
034c6ed7
LP		 1960void exec_context_init(ExecContext *c) {
1961 assert(c);
1962
4c12626c 1963 c->umask = 0022;
9eba9da4 1964 c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
94f04347 1965 c->cpu_sched_policy = SCHED_OTHER;
071830ff 1966 c->syslog_priority = LOG_DAEMON|LOG_INFO;
74922904 1967 c->syslog_level_prefix = true;
353e12c2 1968 c->ignore_sigpipe = true;
3a43da28 1969 c->timer_slack_nsec = NSEC_INFINITY;
050f7277 1970 c->personality = PERSONALITY_INVALID;
e66cf1a3 1971 c->runtime_directory_mode = 0755;
034c6ed7
LP		 1972}
1973
613b411c 1974void exec_context_done(ExecContext *c) {
5cb5a6ff
LP		 1975 unsigned l;
1976
1977 assert(c);
1978
1979 strv_free(c->environment);
034c6ed7 1980 c->environment = NULL;
5cb5a6ff 1981
8c7be95e
LP		 1982 strv_free(c->environment_files);
1983 c->environment_files = NULL;
1984
034c6ed7 1985 for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
5cb5a6ff 1986 free(c->rlimit[l]);
034c6ed7
LP		 1987 c->rlimit[l] = NULL;
1988 }
1989
9eba9da4
LP		 1990 free(c->working_directory);
1991 c->working_directory = NULL;
1992 free(c->root_directory);
1993 c->root_directory = NULL;
5cb5a6ff 1994
80876c20
LP		 1995 free(c->tty_path);
1996 c->tty_path = NULL;
1997
071830ff
LP		 1998 free(c->syslog_identifier);
1999 c->syslog_identifier = NULL;
2000
5cb5a6ff 2001 free(c->user);
034c6ed7
LP		 2002 c->user = NULL;
2003
5cb5a6ff 2004 free(c->group);
034c6ed7
LP		 2005 c->group = NULL;
2006
2007 strv_free(c->supplementary_groups);
2008 c->supplementary_groups = NULL;
94f04347 2009
5b6319dc
LP		 2010 free(c->pam_name);
2011 c->pam_name = NULL;
2012
94f04347
LP		 2013 if (c->capabilities) {
2014 cap_free(c->capabilities);
2015 c->capabilities = NULL;
2016 }
15ae422b
LP		 2017
2018 strv_free(c->read_only_dirs);
2019 c->read_only_dirs = NULL;
2020
2021 strv_free(c->read_write_dirs);
2022 c->read_write_dirs = NULL;
2023
2024 strv_free(c->inaccessible_dirs);
2025 c->inaccessible_dirs = NULL;
82c121a4
LP		 2026
2027 if (c->cpuset)
2028 CPU_FREE(c->cpuset);
86a3475b
LP		 2029
2030 free(c->utmp_id);
2031 c->utmp_id = NULL;
b9a0e010 2032
7b52a628
MS		 2033 free(c->selinux_context);
2034 c->selinux_context = NULL;
2035
eef65bf3
MS		 2036 free(c->apparmor_profile);
2037 c->apparmor_profile = NULL;
2038
17df7223
LP		 2039 set_free(c->syscall_filter);
2040 c->syscall_filter = NULL;
57183d11
LP		 2041
2042 set_free(c->syscall_archs);
2043 c->syscall_archs = NULL;
4298d0b5
LP		 2044
2045 set_free(c->address_families);
2046 c->address_families = NULL;
e66cf1a3
LP		 2047
2048 strv_free(c->runtime_directory);
2049 c->runtime_directory = NULL;
bb7dd0b0
DM		 2050
2051 bus_endpoint_free(c->bus_endpoint);
2052 c->bus_endpoint = NULL;
e66cf1a3
LP		 2053}
2054
2055int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) {
2056 char **i;
2057
2058 assert(c);
2059
2060 if (!runtime_prefix)
2061 return 0;
2062
2063 STRV_FOREACH(i, c->runtime_directory) {
2064 _cleanup_free_ char *p;
2065
2066 p = strjoin(runtime_prefix, "/", *i, NULL);
2067 if (!p)
2068 return -ENOMEM;
2069
2070 /* We execute this synchronously, since we need to be
2071 * sure this is gone when we start the service
2072 * next. */
c6878637 2073 (void) rm_rf(p, REMOVE_ROOT);
e66cf1a3
LP		 2074 }
2075
2076 return 0;
5cb5a6ff
LP		 2077}
2078
43d0fcbd
LP		 2079void exec_command_done(ExecCommand *c) {
2080 assert(c);
2081
2082 free(c->path);
2083 c->path = NULL;
2084
2085 strv_free(c->argv);
2086 c->argv = NULL;
2087}
2088
2089void exec_command_done_array(ExecCommand *c, unsigned n) {
2090 unsigned i;
2091
2092 for (i = 0; i < n; i++)
2093 exec_command_done(c+i);
2094}
2095
f1acf85a 2096ExecCommand* exec_command_free_list(ExecCommand *c) {
5cb5a6ff
LP		 2097 ExecCommand *i;
2098
2099 while ((i = c)) {
71fda00f 2100 LIST_REMOVE(command, c, i);
43d0fcbd 2101 exec_command_done(i);
5cb5a6ff
LP		 2102 free(i);
2103 }
f1acf85a
ZJS		 2104
2105 return NULL;
5cb5a6ff
LP		 2106}
2107
034c6ed7
LP		 2108void exec_command_free_array(ExecCommand **c, unsigned n) {
2109 unsigned i;
2110
f1acf85a
ZJS		 2111 for (i = 0; i < n; i++)
2112 c[i] = exec_command_free_list(c[i]);
034c6ed7
LP		 2113}
2114
039f0e70 2115typedef struct InvalidEnvInfo {
f2341e0a 2116 Unit *unit;
039f0e70
LP		 2117 const char *path;
2118} InvalidEnvInfo;
2119
2120static void invalid_env(const char *p, void *userdata) {
2121 InvalidEnvInfo *info = userdata;
2122
f2341e0a 2123 log_unit_error(info->unit, "Ignoring invalid environment assignment '%s': %s", p, info->path);
039f0e70
LP		 2124}
2125
f2341e0a 2126int exec_context_load_environment(Unit *unit, const ExecContext *c, char ***l) {
8c7be95e
LP		 2127 char **i, **r = NULL;
2128
2129 assert(c);
2130 assert(l);
2131
2132 STRV_FOREACH(i, c->environment_files) {
2133 char *fn;
2134 int k;
2135 bool ignore = false;
2136 char **p;
7fd1b19b 2137 _cleanup_globfree_ glob_t pglob = {};
2bef10ab 2138 int count, n;
8c7be95e
LP		 2139
2140 fn = *i;
2141
2142 if (fn[0] == '-') {
2143 ignore = true;
2144 fn ++;
2145 }
2146
2147 if (!path_is_absolute(fn)) {
8c7be95e
LP		 2148 if (ignore)
2149 continue;
2150
2151 strv_free(r);
2152 return -EINVAL;
2153 }
2154
2bef10ab 2155 /* Filename supports globbing, take all matching files */
2bef10ab
PL		 2156 errno = 0;
2157 if (glob(fn, 0, NULL, &pglob) != 0) {
2bef10ab
PL		 2158 if (ignore)
2159 continue;
8c7be95e 2160
2bef10ab
PL		 2161 strv_free(r);
2162 return errno ? -errno : -EINVAL;
2163 }
2164 count = pglob.gl_pathc;
2165 if (count == 0) {
8c7be95e
LP		 2166 if (ignore)
2167 continue;
2168
2169 strv_free(r);
2bef10ab 2170 return -EINVAL;
8c7be95e 2171 }
2bef10ab 2172 for (n = 0; n < count; n++) {
717603e3 2173 k = load_env_file(NULL, pglob.gl_pathv[n], NULL, &p);
2bef10ab
PL		 2174 if (k < 0) {
2175 if (ignore)
2176 continue;
8c7be95e 2177
2bef10ab 2178 strv_free(r);
2bef10ab 2179 return k;
e9c1ea9d 2180 }
ebc05a09 2181 /* Log invalid environment variables with filename */
039f0e70
LP		 2182 if (p) {
2183 InvalidEnvInfo info = {
f2341e0a 2184 .unit = unit,
039f0e70
LP		 2185 .path = pglob.gl_pathv[n]
2186 };
2187
2188 p = strv_env_clean_with_callback(p, invalid_env, &info);
2189 }
8c7be95e 2190
2bef10ab
PL		 2191 if (r == NULL)
2192 r = p;
2193 else {
2194 char **m;
8c7be95e 2195
2bef10ab
PL		 2196 m = strv_env_merge(2, r, p);
2197 strv_free(r);
2198 strv_free(p);
c84a9488 2199 if (!m)
2bef10ab 2200 return -ENOMEM;
2bef10ab
PL		 2201
2202 r = m;
2203 }
8c7be95e
LP		 2204 }
2205 }
2206
2207 *l = r;
2208
2209 return 0;
2210}
2211
6ac8fdc9 2212static bool tty_may_match_dev_console(const char *tty) {
e1d75803
RC		 2213 _cleanup_free_ char *active = NULL;
2214 char *console;
6ac8fdc9
MS		 2215
2216 if (startswith(tty, "/dev/"))
2217 tty += 5;
2218
2219 /* trivial identity? */
2220 if (streq(tty, "console"))
2221 return true;
2222
2223 console = resolve_dev_console(&active);
2224 /* if we could not resolve, assume it may */
2225 if (!console)
2226 return true;
2227
2228 /* "tty0" means the active VC, so it may be the same sometimes */
e1d75803 2229 return streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty));
6ac8fdc9
MS		 2230}
2231
2232bool exec_context_may_touch_console(ExecContext *ec) {
2233 return (ec->tty_reset || ec->tty_vhangup || ec->tty_vt_disallocate ||
2234 is_terminal_input(ec->std_input) ||
2235 is_terminal_output(ec->std_output) ||
2236 is_terminal_output(ec->std_error)) &&
2237 tty_may_match_dev_console(tty_path(ec));
2238}
2239
15ae422b
LP		 2240static void strv_fprintf(FILE *f, char **l) {
2241 char **g;
2242
2243 assert(f);
2244
2245 STRV_FOREACH(g, l)
2246 fprintf(f, " %s", *g);
2247}
2248
5cb5a6ff 2249void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
507f22bd 2250 char **e;
94f04347 2251 unsigned i;
9eba9da4 2252
5cb5a6ff
LP		 2253 assert(c);
2254 assert(f);
2255
4ad49000 2256 prefix = strempty(prefix);
5cb5a6ff
LP		 2257
2258 fprintf(f,
94f04347
LP		 2259 "%sUMask: %04o\n"
2260 "%sWorkingDirectory: %s\n"
451a074f 2261 "%sRootDirectory: %s\n"
15ae422b 2262 "%sNonBlocking: %s\n"
64747e2d 2263 "%sPrivateTmp: %s\n"
4819ff03 2264 "%sPrivateNetwork: %s\n"
7f112f50 2265 "%sPrivateDevices: %s\n"
1b8689f9
LP		 2266 "%sProtectHome: %s\n"
2267 "%sProtectSystem: %s\n"
3bb07b76 2268 "%sIgnoreSIGPIPE: %s\n",
5cb5a6ff 2269 prefix, c->umask,
9eba9da4 2270 prefix, c->working_directory ? c->working_directory : "/",
451a074f 2271 prefix, c->root_directory ? c->root_directory : "/",
15ae422b 2272 prefix, yes_no(c->non_blocking),
64747e2d 2273 prefix, yes_no(c->private_tmp),
4819ff03 2274 prefix, yes_no(c->private_network),
7f112f50 2275 prefix, yes_no(c->private_devices),
1b8689f9
LP		 2276 prefix, protect_home_to_string(c->protect_home),
2277 prefix, protect_system_to_string(c->protect_system),
3bb07b76 2278 prefix, yes_no(c->ignore_sigpipe));
fb33a393 2279
8c7be95e
LP		 2280 STRV_FOREACH(e, c->environment)
2281 fprintf(f, "%sEnvironment: %s\n", prefix, *e);
2282
2283 STRV_FOREACH(e, c->environment_files)
2284 fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e);
94f04347 2285
fb33a393
LP		 2286 if (c->nice_set)
2287 fprintf(f,
2288 "%sNice: %i\n",
2289 prefix, c->nice);
2290
dd6c17b1 2291 if (c->oom_score_adjust_set)
fb33a393 2292 fprintf(f,
dd6c17b1
LP		 2293 "%sOOMScoreAdjust: %i\n",
2294 prefix, c->oom_score_adjust);
9eba9da4 2295
94f04347
LP		 2296 for (i = 0; i < RLIM_NLIMITS; i++)
2297 if (c->rlimit[i])
de0671ee
ZJS		 2298 fprintf(f, "%s%s: "RLIM_FMT"\n",
2299 prefix, rlimit_to_string(i), c->rlimit[i]->rlim_max);
94f04347 2300
f8b69d1d 2301 if (c->ioprio_set) {
1756a011 2302 _cleanup_free_ char *class_str = NULL;
f8b69d1d 2303
1756a011 2304 ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str);
9eba9da4
LP		 2305 fprintf(f,
2306 "%sIOSchedulingClass: %s\n"
2307 "%sIOPriority: %i\n",
f8b69d1d 2308 prefix, strna(class_str),
9eba9da4 2309 prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
f8b69d1d 2310 }
94f04347 2311
f8b69d1d 2312 if (c->cpu_sched_set) {
1756a011 2313 _cleanup_free_ char *policy_str = NULL;
f8b69d1d 2314
1756a011 2315 sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str);
94f04347
LP		 2316 fprintf(f,
2317 "%sCPUSchedulingPolicy: %s\n"
38b48754
LP		 2318 "%sCPUSchedulingPriority: %i\n"
2319 "%sCPUSchedulingResetOnFork: %s\n",
f8b69d1d 2320 prefix, strna(policy_str),
38b48754
LP		 2321 prefix, c->cpu_sched_priority,
2322 prefix, yes_no(c->cpu_sched_reset_on_fork));
b929bf04 2323 }
94f04347 2324
82c121a4 2325 if (c->cpuset) {
94f04347 2326 fprintf(f, "%sCPUAffinity:", prefix);
82c121a4
LP		 2327 for (i = 0; i < c->cpuset_ncpus; i++)
2328 if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset))
43a99a7a 2329 fprintf(f, " %u", i);
94f04347
LP		 2330 fputs("\n", f);
2331 }
2332
3a43da28 2333 if (c->timer_slack_nsec != NSEC_INFINITY)
ccd06097 2334 fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec);
94f04347
LP		 2335
2336 fprintf(f,
80876c20
LP		 2337 "%sStandardInput: %s\n"
2338 "%sStandardOutput: %s\n"
2339 "%sStandardError: %s\n",
2340 prefix, exec_input_to_string(c->std_input),
2341 prefix, exec_output_to_string(c->std_output),
2342 prefix, exec_output_to_string(c->std_error));
2343
2344 if (c->tty_path)
2345 fprintf(f,
6ea832a2
LP		 2346 "%sTTYPath: %s\n"
2347 "%sTTYReset: %s\n"
2348 "%sTTYVHangup: %s\n"
2349 "%sTTYVTDisallocate: %s\n",
2350 prefix, c->tty_path,
2351 prefix, yes_no(c->tty_reset),
2352 prefix, yes_no(c->tty_vhangup),
2353 prefix, yes_no(c->tty_vt_disallocate));
94f04347 2354
5ce70e5b
ZJS		 2355 if (c->std_output == EXEC_OUTPUT_SYSLOG ||
2356 c->std_output == EXEC_OUTPUT_KMSG ||
2357 c->std_output == EXEC_OUTPUT_JOURNAL ||
2358 c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
2359 c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
2360 c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE ||
2361 c->std_error == EXEC_OUTPUT_SYSLOG ||
2362 c->std_error == EXEC_OUTPUT_KMSG ||
2363 c->std_error == EXEC_OUTPUT_JOURNAL ||
2364 c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
2365 c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
2366 c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) {
f8b69d1d 2367
5ce70e5b 2368 _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL;
f8b69d1d 2369
5ce70e5b
ZJS		 2370 log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str);
2371 log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str);
f8b69d1d 2372
94f04347
LP		 2373 fprintf(f,
2374 "%sSyslogFacility: %s\n"
2375 "%sSyslogLevel: %s\n",
f8b69d1d
MS		 2376 prefix, strna(fac_str),
2377 prefix, strna(lvl_str));
f8b69d1d 2378 }
94f04347
LP		 2379
2380 if (c->capabilities) {
5ce70e5b
ZJS		 2381 _cleanup_cap_free_charp_ char *t;
2382
2383 t = cap_to_text(c->capabilities, NULL);
2384 if (t)
2385 fprintf(f, "%sCapabilities: %s\n", prefix, t);
94f04347
LP		 2386 }
2387
2388 if (c->secure_bits)
2389 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
2390 prefix,
cbb21cca
ZJS		 2391 (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "",
2392 (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
2393 (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
2394 (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
2395 (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "",
2396 (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
94f04347
LP		 2397
2398 if (c->capability_bounding_set_drop) {
ae556c21 2399 unsigned long l;
260abb78 2400 fprintf(f, "%sCapabilityBoundingSet:", prefix);
94f04347 2401
64685e0c 2402 for (l = 0; l <= cap_last_cap(); l++)
2822da4f
LP		 2403 if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l)))
2404 fprintf(f, " %s", strna(capability_to_name(l)));
94f04347
LP		 2405
2406 fputs("\n", f);
2407 }
2408
2409 if (c->user)
f2d3769a 2410 fprintf(f, "%sUser: %s\n", prefix, c->user);
94f04347 2411 if (c->group)
f2d3769a 2412 fprintf(f, "%sGroup: %s\n", prefix, c->group);
94f04347 2413
15ae422b 2414 if (strv_length(c->supplementary_groups) > 0) {
94f04347 2415 fprintf(f, "%sSupplementaryGroups:", prefix);
15ae422b
LP		 2416 strv_fprintf(f, c->supplementary_groups);
2417 fputs("\n", f);
2418 }
94f04347 2419
5b6319dc 2420 if (c->pam_name)
f2d3769a 2421 fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name);
5b6319dc 2422
15ae422b
LP		 2423 if (strv_length(c->read_write_dirs) > 0) {
2424 fprintf(f, "%sReadWriteDirs:", prefix);
2425 strv_fprintf(f, c->read_write_dirs);
2426 fputs("\n", f);
2427 }
2428
2429 if (strv_length(c->read_only_dirs) > 0) {
2430 fprintf(f, "%sReadOnlyDirs:", prefix);
2431 strv_fprintf(f, c->read_only_dirs);
2432 fputs("\n", f);
2433 }
94f04347 2434
15ae422b
LP		 2435 if (strv_length(c->inaccessible_dirs) > 0) {
2436 fprintf(f, "%sInaccessibleDirs:", prefix);
2437 strv_fprintf(f, c->inaccessible_dirs);
94f04347
LP		 2438 fputs("\n", f);
2439 }
2e22afe9 2440
169c1bda
LP		 2441 if (c->utmp_id)
2442 fprintf(f,
2443 "%sUtmpIdentifier: %s\n",
2444 prefix, c->utmp_id);
7b52a628
MS		 2445
2446 if (c->selinux_context)
2447 fprintf(f,
5f8640fb
LP		 2448 "%sSELinuxContext: %s%s\n",
2449 prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context);
17df7223 2450
050f7277 2451 if (c->personality != PERSONALITY_INVALID)
ac45f971
LP		 2452 fprintf(f,
2453 "%sPersonality: %s\n",
2454 prefix, strna(personality_to_string(c->personality)));
2455
17df7223 2456 if (c->syscall_filter) {
351a19b1 2457#ifdef HAVE_SECCOMP
17df7223
LP		 2458 Iterator j;
2459 void *id;
2460 bool first = true;
351a19b1 2461#endif
17df7223
LP		 2462
2463 fprintf(f,
57183d11 2464 "%sSystemCallFilter: ",
17df7223
LP		 2465 prefix);
2466
2467 if (!c->syscall_whitelist)
2468 fputc('~', f);
2469
351a19b1 2470#ifdef HAVE_SECCOMP
17df7223
LP		 2471 SET_FOREACH(id, c->syscall_filter, j) {
2472 _cleanup_free_ char *name = NULL;
2473
2474 if (first)
2475 first = false;
2476 else
2477 fputc(' ', f);
2478
57183d11 2479 name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1);
17df7223
LP		 2480 fputs(strna(name), f);
2481 }
351a19b1 2482#endif
17df7223
LP		 2483
2484 fputc('\n', f);
2485 }
2486
57183d11
LP		 2487 if (c->syscall_archs) {
2488#ifdef HAVE_SECCOMP
2489 Iterator j;
2490 void *id;
2491#endif
2492
2493 fprintf(f,
2494 "%sSystemCallArchitectures:",
2495 prefix);
2496
2497#ifdef HAVE_SECCOMP
2498 SET_FOREACH(id, c->syscall_archs, j)
2499 fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1)));
2500#endif
2501 fputc('\n', f);
2502 }
2503
17df7223
LP		 2504 if (c->syscall_errno != 0)
2505 fprintf(f,
2506 "%sSystemCallErrorNumber: %s\n",
2507 prefix, strna(errno_to_name(c->syscall_errno)));
eef65bf3
MS		 2508
2509 if (c->apparmor_profile)
2510 fprintf(f,
2511 "%sAppArmorProfile: %s%s\n",
2512 prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile);
5cb5a6ff
LP		 2513}
2514
a931ad47
LP		 2515bool exec_context_maintains_privileges(ExecContext *c) {
2516 assert(c);
2517
2518 /* Returns true if the process forked off would run run under
2519 * an unchanged UID or as root. */
2520
2521 if (!c->user)
2522 return true;
2523
2524 if (streq(c->user, "root") || streq(c->user, "0"))
2525 return true;
2526
2527 return false;
2528}
2529
b58b4116 2530void exec_status_start(ExecStatus *s, pid_t pid) {
034c6ed7 2531 assert(s);
5cb5a6ff 2532
b58b4116
LP		 2533 zero(*s);
2534 s->pid = pid;
2535 dual_timestamp_get(&s->start_timestamp);
2536}
2537
6ea832a2 2538void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) {
b58b4116
LP		 2539 assert(s);
2540
0b1f4ae6 2541 if (s->pid && s->pid != pid)
b58b4116
LP		 2542 zero(*s);
2543
034c6ed7 2544 s->pid = pid;
63983207 2545 dual_timestamp_get(&s->exit_timestamp);
9fb86720 2546
034c6ed7
LP		 2547 s->code = code;
2548 s->status = status;
169c1bda 2549
6ea832a2
LP		 2550 if (context) {
2551 if (context->utmp_id)
2552 utmp_put_dead_process(context->utmp_id, pid, code, status);
2553
2554 exec_context_tty_reset(context);
2555 }
9fb86720
LP		 2556}
2557
2558void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
2559 char buf[FORMAT_TIMESTAMP_MAX];
2560
2561 assert(s);
2562 assert(f);
2563
9fb86720
LP		 2564 if (s->pid <= 0)
2565 return;
2566
4c940960
LP		 2567 prefix = strempty(prefix);
2568
9fb86720 2569 fprintf(f,
ccd06097
ZJS		 2570 "%sPID: "PID_FMT"\n",
2571 prefix, s->pid);
9fb86720 2572
63983207 2573 if (s->start_timestamp.realtime > 0)
9fb86720
LP		 2574 fprintf(f,
2575 "%sStart Timestamp: %s\n",
63983207 2576 prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime));
9fb86720 2577
63983207 2578 if (s->exit_timestamp.realtime > 0)
9fb86720
LP		 2579 fprintf(f,
2580 "%sExit Timestamp: %s\n"
2581 "%sExit Code: %s\n"
2582 "%sExit Status: %i\n",
63983207 2583 prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime),
9fb86720
LP		 2584 prefix, sigchld_code_to_string(s->code),
2585 prefix, s->status);
5cb5a6ff 2586}
44d8db9e 2587
9e2f7c11 2588char *exec_command_line(char **argv) {
44d8db9e
LP		 2589 size_t k;
2590 char *n, *p, **a;
2591 bool first = true;
2592
9e2f7c11 2593 assert(argv);
44d8db9e 2594
9164977d 2595 k = 1;
9e2f7c11 2596 STRV_FOREACH(a, argv)
44d8db9e
LP		 2597 k += strlen(*a)+3;
2598
2599 if (!(n = new(char, k)))
2600 return NULL;
2601
2602 p = n;
9e2f7c11 2603 STRV_FOREACH(a, argv) {
44d8db9e
LP		 2604
2605 if (!first)
2606 *(p++) = ' ';
2607 else
2608 first = false;
2609
2610 if (strpbrk(*a, WHITESPACE)) {
2611 *(p++) = '\'';
2612 p = stpcpy(p, *a);
2613 *(p++) = '\'';
2614 } else
2615 p = stpcpy(p, *a);
2616
2617 }
2618
9164977d
LP		 2619 *p = 0;
2620
44d8db9e
LP		 2621 /* FIXME: this doesn't really handle arguments that have
2622 * spaces and ticks in them */
2623
2624 return n;
2625}
2626
2627void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
e1d75803 2628 _cleanup_free_ char *cmd = NULL;
4c940960 2629 const char *prefix2;
44d8db9e
LP		 2630
2631 assert(c);
2632 assert(f);
2633
4c940960 2634 prefix = strempty(prefix);
63c372cb 2635 prefix2 = strjoina(prefix, "\t");
44d8db9e 2636
9e2f7c11 2637 cmd = exec_command_line(c->argv);
44d8db9e
LP		 2638 fprintf(f,
2639 "%sCommand Line: %s\n",
2640 prefix, cmd ? cmd : strerror(ENOMEM));
2641
9fb86720 2642 exec_status_dump(&c->exec_status, f, prefix2);
44d8db9e
LP		 2643}
2644
2645void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
2646 assert(f);
2647
4c940960 2648 prefix = strempty(prefix);
44d8db9e
LP		 2649
2650 LIST_FOREACH(command, c, c)
2651 exec_command_dump(c, f, prefix);
2652}
94f04347 2653
a6a80b4f
LP		 2654void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
2655 ExecCommand *end;
2656
2657 assert(l);
2658 assert(e);
2659
2660 if (*l) {
35b8ca3a 2661 /* It's kind of important, that we keep the order here */
71fda00f
LP		 2662 LIST_FIND_TAIL(command, *l, end);
2663 LIST_INSERT_AFTER(command, *l, end, e);
a6a80b4f
LP		 2664 } else
2665 *l = e;
2666}
2667
26fd040d
LP		 2668int exec_command_set(ExecCommand *c, const char *path, ...) {
2669 va_list ap;
2670 char **l, *p;
2671
2672 assert(c);
2673 assert(path);
2674
2675 va_start(ap, path);
2676 l = strv_new_ap(path, ap);
2677 va_end(ap);
2678
2679 if (!l)
2680 return -ENOMEM;
2681
250a918d
LP		 2682 p = strdup(path);
2683 if (!p) {
26fd040d
LP		 2684 strv_free(l);
2685 return -ENOMEM;
2686 }
2687
2688 free(c->path);
2689 c->path = p;
2690
2691 strv_free(c->argv);
2692 c->argv = l;
2693
2694 return 0;
2695}
2696
86b23b07 2697int exec_command_append(ExecCommand *c, const char *path, ...) {
e63ff941 2698 _cleanup_strv_free_ char **l = NULL;
86b23b07 2699 va_list ap;
86b23b07
JS		 2700 int r;
2701
2702 assert(c);
2703 assert(path);
2704
2705 va_start(ap, path);
2706 l = strv_new_ap(path, ap);
2707 va_end(ap);
2708
2709 if (!l)
2710 return -ENOMEM;
2711
2712 r = strv_extend_strv(&c->argv, l);
e63ff941 2713 if (r < 0)
86b23b07 2714 return r;
86b23b07
JS		 2715
2716 return 0;
2717}
2718
2719
613b411c
LP		 2720static int exec_runtime_allocate(ExecRuntime **rt) {
2721
2722 if (*rt)
2723 return 0;
2724
2725 *rt = new0(ExecRuntime, 1);
f146f5e1 2726 if (!*rt)
613b411c
LP		 2727 return -ENOMEM;
2728
2729 (*rt)->n_ref = 1;
2730 (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1;
2731
2732 return 0;
2733}
2734
2735int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) {
2736 int r;
2737
2738 assert(rt);
2739 assert(c);
2740 assert(id);
2741
2742 if (*rt)
2743 return 1;
2744
2745 if (!c->private_network && !c->private_tmp)
2746 return 0;
2747
2748 r = exec_runtime_allocate(rt);
2749 if (r < 0)
2750 return r;
2751
2752 if (c->private_network && (*rt)->netns_storage_socket[0] < 0) {
2753 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, (*rt)->netns_storage_socket) < 0)
2754 return -errno;
2755 }
2756
2757 if (c->private_tmp && !(*rt)->tmp_dir) {
2758 r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir);
2759 if (r < 0)
2760 return r;
2761 }
2762
2763 return 1;
2764}
2765
2766ExecRuntime *exec_runtime_ref(ExecRuntime *r) {
2767 assert(r);
2768 assert(r->n_ref > 0);
2769
2770 r->n_ref++;
2771 return r;
2772}
2773
2774ExecRuntime *exec_runtime_unref(ExecRuntime *r) {
2775
2776 if (!r)
2777 return NULL;
2778
2779 assert(r->n_ref > 0);
2780
2781 r->n_ref--;
f2341e0a
LP		 2782 if (r->n_ref > 0)
2783 return NULL;
2784
2785 free(r->tmp_dir);
2786 free(r->var_tmp_dir);
2787 safe_close_pair(r->netns_storage_socket);
2788 free(r);
613b411c
LP		 2789
2790 return NULL;
2791}
2792
f2341e0a 2793int exec_runtime_serialize(Unit *u, ExecRuntime *rt, FILE *f, FDSet *fds) {
613b411c
LP		 2794 assert(u);
2795 assert(f);
2796 assert(fds);
2797
2798 if (!rt)
2799 return 0;
2800
2801 if (rt->tmp_dir)
2802 unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir);
2803
2804 if (rt->var_tmp_dir)
2805 unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir);
2806
2807 if (rt->netns_storage_socket[0] >= 0) {
2808 int copy;
2809
2810 copy = fdset_put_dup(fds, rt->netns_storage_socket[0]);
2811 if (copy < 0)
2812 return copy;
2813
2814 unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy);
2815 }
2816
2817 if (rt->netns_storage_socket[1] >= 0) {
2818 int copy;
2819
2820 copy = fdset_put_dup(fds, rt->netns_storage_socket[1]);
2821 if (copy < 0)
2822 return copy;
2823
2824 unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy);
2825 }
2826
2827 return 0;
2828}
2829
f2341e0a 2830int exec_runtime_deserialize_item(Unit *u, ExecRuntime **rt, const char *key, const char *value, FDSet *fds) {
613b411c
LP		 2831 int r;
2832
2833 assert(rt);
2834 assert(key);
2835 assert(value);
2836
2837 if (streq(key, "tmp-dir")) {
2838 char *copy;
2839
2840 r = exec_runtime_allocate(rt);
2841 if (r < 0)
f2341e0a 2842 return log_oom();
613b411c
LP		 2843
2844 copy = strdup(value);
2845 if (!copy)
2846 return log_oom();
2847
2848 free((*rt)->tmp_dir);
2849 (*rt)->tmp_dir = copy;
2850
2851 } else if (streq(key, "var-tmp-dir")) {
2852 char *copy;
2853
2854 r = exec_runtime_allocate(rt);
2855 if (r < 0)
f2341e0a 2856 return log_oom();
613b411c
LP		 2857
2858 copy = strdup(value);
2859 if (!copy)
2860 return log_oom();
2861
2862 free((*rt)->var_tmp_dir);
2863 (*rt)->var_tmp_dir = copy;
2864
2865 } else if (streq(key, "netns-socket-0")) {
2866 int fd;
2867
2868 r = exec_runtime_allocate(rt);
2869 if (r < 0)
f2341e0a 2870 return log_oom();
613b411c
LP		 2871
2872 if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
f2341e0a 2873 log_unit_debug(u, "Failed to parse netns socket value: %s", value);
613b411c 2874 else {
03e334a1 2875 safe_close((*rt)->netns_storage_socket[0]);
613b411c
LP		 2876 (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd);
2877 }
2878 } else if (streq(key, "netns-socket-1")) {
2879 int fd;
2880
2881 r = exec_runtime_allocate(rt);
2882 if (r < 0)
f2341e0a 2883 return log_oom();
613b411c
LP		 2884
2885 if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
f2341e0a 2886 log_unit_debug(u, "Failed to parse netns socket value: %s", value);
613b411c 2887 else {
03e334a1 2888 safe_close((*rt)->netns_storage_socket[1]);
613b411c
LP		 2889 (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd);
2890 }
2891 } else
2892 return 0;
2893
2894 return 1;
2895}
2896
2897static void *remove_tmpdir_thread(void *p) {
2898 _cleanup_free_ char *path = p;
2899
c6878637 2900 (void) rm_rf(path, REMOVE_ROOT|REMOVE_PHYSICAL);
613b411c
LP		 2901 return NULL;
2902}
2903
2904void exec_runtime_destroy(ExecRuntime *rt) {
98b47d54
LP		 2905 int r;
2906
613b411c
LP		 2907 if (!rt)
2908 return;
2909
2910 /* If there are multiple users of this, let's leave the stuff around */
2911 if (rt->n_ref > 1)
2912 return;
2913
2914 if (rt->tmp_dir) {
2915 log_debug("Spawning thread to nuke %s", rt->tmp_dir);
98b47d54
LP		 2916
2917 r = asynchronous_job(remove_tmpdir_thread, rt->tmp_dir);
2918 if (r < 0) {
da927ba9 2919 log_warning_errno(r, "Failed to nuke %s: %m", rt->tmp_dir);
98b47d54
LP		 2920 free(rt->tmp_dir);
2921 }
2922
613b411c
LP		 2923 rt->tmp_dir = NULL;
2924 }
2925
2926 if (rt->var_tmp_dir) {
2927 log_debug("Spawning thread to nuke %s", rt->var_tmp_dir);
98b47d54
LP		 2928
2929 r = asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir);
2930 if (r < 0) {
da927ba9 2931 log_warning_errno(r, "Failed to nuke %s: %m", rt->var_tmp_dir);
98b47d54
LP		 2932 free(rt->var_tmp_dir);
2933 }
2934
613b411c
LP		 2935 rt->var_tmp_dir = NULL;
2936 }
2937
3d94f76c 2938 safe_close_pair(rt->netns_storage_socket);
613b411c
LP		 2939}
2940
80876c20
LP		 2941static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
2942 [EXEC_INPUT_NULL] = "null",
2943 [EXEC_INPUT_TTY] = "tty",
2944 [EXEC_INPUT_TTY_FORCE] = "tty-force",
4f2d528d
LP		 2945 [EXEC_INPUT_TTY_FAIL] = "tty-fail",
2946 [EXEC_INPUT_SOCKET] = "socket"
80876c20
LP		 2947};
2948
8a0867d6
LP		 2949DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
2950
94f04347 2951static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
80876c20 2952 [EXEC_OUTPUT_INHERIT] = "inherit",
94f04347 2953 [EXEC_OUTPUT_NULL] = "null",
80876c20 2954 [EXEC_OUTPUT_TTY] = "tty",
94f04347 2955 [EXEC_OUTPUT_SYSLOG] = "syslog",
28dbc1e8 2956 [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console",
9a6bca7a 2957 [EXEC_OUTPUT_KMSG] = "kmsg",
28dbc1e8 2958 [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console",
706343f4
LP		 2959 [EXEC_OUTPUT_JOURNAL] = "journal",
2960 [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console",
4f2d528d 2961 [EXEC_OUTPUT_SOCKET] = "socket"
94f04347
LP		 2962};
2963
2964DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
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