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Make systemctl --root look for files in the proper places
[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
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"
5cb5a6ff 86
57183d11
LP		 87#ifdef HAVE_SECCOMP
88#include "seccomp-util.h"
89#endif
90
e056b01d 91#define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC)
31a7eb86 92#define IDLE_TIMEOUT2_USEC (1*USEC_PER_SEC)
e6a26745 93
02a51aba
LP		 94/* This assumes there is a 'tty' group */
95#define TTY_MODE 0620
96
531dca78
LP		 97#define SNDBUF_SIZE (8*1024*1024)
98
034c6ed7
LP		 99static int shift_fds(int fds[], unsigned n_fds) {
100 int start, restart_from;
101
102 if (n_fds <= 0)
103 return 0;
104
a0d40ac5
LP		 105 /* Modifies the fds array! (sorts it) */
106
034c6ed7
LP		 107 assert(fds);
108
109 start = 0;
110 for (;;) {
111 int i;
112
113 restart_from = -1;
114
115 for (i = start; i < (int) n_fds; i++) {
116 int nfd;
117
118 /* Already at right index? */
119 if (fds[i] == i+3)
120 continue;
121
122 if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
123 return -errno;
124
03e334a1 125 safe_close(fds[i]);
034c6ed7
LP		 126 fds[i] = nfd;
127
128 /* Hmm, the fd we wanted isn't free? Then
129 * let's remember that and try again from here*/
130 if (nfd != i+3 && restart_from < 0)
131 restart_from = i;
132 }
133
134 if (restart_from < 0)
135 break;
136
137 start = restart_from;
138 }
139
140 return 0;
141}
142
c2748801 143static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) {
47a71eed 144 unsigned i;
e2c76839 145 int r;
47a71eed
LP		 146
147 if (n_fds <= 0)
148 return 0;
149
150 assert(fds);
151
451a074f 152 /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
47a71eed
LP		 153
154 for (i = 0; i < n_fds; i++) {
47a71eed 155
e2c76839
LP		 156 if ((r = fd_nonblock(fds[i], nonblock)) < 0)
157 return r;
47a71eed 158
451a074f
LP		 159 /* We unconditionally drop FD_CLOEXEC from the fds,
160 * since after all we want to pass these fds to our
161 * children */
47a71eed 162
e2c76839
LP		 163 if ((r = fd_cloexec(fds[i], false)) < 0)
164 return r;
47a71eed
LP		 165 }
166
167 return 0;
168}
169
44a6b1b6 170_pure_ static const char *tty_path(const ExecContext *context) {
80876c20
LP		 171 assert(context);
172
173 if (context->tty_path)
174 return context->tty_path;
175
176 return "/dev/console";
177}
178
9588bc32 179static void exec_context_tty_reset(const ExecContext *context) {
6ea832a2
LP		 180 assert(context);
181
182 if (context->tty_vhangup)
183 terminal_vhangup(tty_path(context));
184
185 if (context->tty_reset)
186 reset_terminal(tty_path(context));
187
188 if (context->tty_vt_disallocate && context->tty_path)
189 vt_disallocate(context->tty_path);
190}
191
3a1286b6
MS		 192static bool is_terminal_output(ExecOutput o) {
193 return
194 o == EXEC_OUTPUT_TTY ||
195 o == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
196 o == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
197 o == EXEC_OUTPUT_JOURNAL_AND_CONSOLE;
198}
199
80876c20
LP		 200static int open_null_as(int flags, int nfd) {
201 int fd, r;
071830ff 202
80876c20 203 assert(nfd >= 0);
071830ff 204
613b411c
LP		 205 fd = open("/dev/null", flags|O_NOCTTY);
206 if (fd < 0)
071830ff
LP		 207 return -errno;
208
80876c20
LP		 209 if (fd != nfd) {
210 r = dup2(fd, nfd) < 0 ? -errno : nfd;
03e334a1 211 safe_close(fd);
80876c20
LP		 212 } else
213 r = nfd;
071830ff 214
80876c20 215 return r;
071830ff
LP		 216}
217
62bca2c6 218static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, const char *unit_id, int nfd) {
80876c20 219 int fd, r;
b92bea5d
ZJS		 220 union sockaddr_union sa = {
221 .un.sun_family = AF_UNIX,
222 .un.sun_path = "/run/systemd/journal/stdout",
223 };
071830ff
LP		 224
225 assert(context);
80876c20
LP		 226 assert(output < _EXEC_OUTPUT_MAX);
227 assert(ident);
228 assert(nfd >= 0);
071830ff 229
54fe0cdb
LP		 230 fd = socket(AF_UNIX, SOCK_STREAM, 0);
231 if (fd < 0)
80876c20 232 return -errno;
071830ff 233
54fe0cdb
LP		 234 r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
235 if (r < 0) {
03e334a1 236 safe_close(fd);
80876c20
LP		 237 return -errno;
238 }
071830ff 239
80876c20 240 if (shutdown(fd, SHUT_RD) < 0) {
03e334a1 241 safe_close(fd);
80876c20
LP		 242 return -errno;
243 }
071830ff 244
531dca78
LP		 245 fd_inc_sndbuf(fd, SNDBUF_SIZE);
246
80876c20 247 dprintf(fd,
62bca2c6 248 "%s\n"
80876c20
LP		 249 "%s\n"
250 "%i\n"
54fe0cdb
LP		 251 "%i\n"
252 "%i\n"
253 "%i\n"
4f4a1dbf 254 "%i\n",
4f4a1dbf 255 context->syslog_identifier ? context->syslog_identifier : ident,
62bca2c6 256 unit_id,
54fe0cdb
LP		 257 context->syslog_priority,
258 !!context->syslog_level_prefix,
259 output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE,
260 output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE,
3a1286b6 261 is_terminal_output(output));
80876c20
LP		 262
263 if (fd != nfd) {
264 r = dup2(fd, nfd) < 0 ? -errno : nfd;
03e334a1 265 safe_close(fd);
80876c20
LP		 266 } else
267 r = nfd;
071830ff 268
80876c20
LP		 269 return r;
270}
271static int open_terminal_as(const char *path, mode_t mode, int nfd) {
272 int fd, r;
071830ff 273
80876c20
LP		 274 assert(path);
275 assert(nfd >= 0);
071830ff 276
80876c20
LP		 277 if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
278 return fd;
071830ff 279
80876c20
LP		 280 if (fd != nfd) {
281 r = dup2(fd, nfd) < 0 ? -errno : nfd;
03e334a1 282 safe_close(fd);
80876c20
LP		 283 } else
284 r = nfd;
071830ff 285
80876c20
LP		 286 return r;
287}
071830ff 288
80876c20
LP		 289static bool is_terminal_input(ExecInput i) {
290 return
291 i == EXEC_INPUT_TTY ||
292 i == EXEC_INPUT_TTY_FORCE ||
293 i == EXEC_INPUT_TTY_FAIL;
294}
071830ff 295
1e3ad081
LP		 296static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) {
297
298 if (is_terminal_input(std_input) && !apply_tty_stdin)
299 return EXEC_INPUT_NULL;
071830ff 300
03fd9c49 301 if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 302 return EXEC_INPUT_NULL;
303
03fd9c49 304 return std_input;
4f2d528d
LP		 305}
306
03fd9c49 307static int fixup_output(ExecOutput std_output, int socket_fd) {
4f2d528d 308
03fd9c49 309 if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0)
4f2d528d
LP		 310 return EXEC_OUTPUT_INHERIT;
311
03fd9c49 312 return std_output;
4f2d528d
LP		 313}
314
1e3ad081 315static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) {
4f2d528d
LP		 316 ExecInput i;
317
318 assert(context);
319
1e3ad081 320 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
4f2d528d
LP		 321
322 switch (i) {
071830ff 323
80876c20
LP		 324 case EXEC_INPUT_NULL:
325 return open_null_as(O_RDONLY, STDIN_FILENO);
326
327 case EXEC_INPUT_TTY:
328 case EXEC_INPUT_TTY_FORCE:
329 case EXEC_INPUT_TTY_FAIL: {
330 int fd, r;
071830ff 331
970edce6
ZJS		 332 fd = acquire_terminal(tty_path(context),
333 i == EXEC_INPUT_TTY_FAIL,
334 i == EXEC_INPUT_TTY_FORCE,
335 false,
336 (usec_t) -1);
337 if (fd < 0)
80876c20
LP		 338 return fd;
339
340 if (fd != STDIN_FILENO) {
341 r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
03e334a1 342 safe_close(fd);
80876c20
LP		 343 } else
344 r = STDIN_FILENO;
345
346 return r;
347 }
348
4f2d528d
LP		 349 case EXEC_INPUT_SOCKET:
350 return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
351
80876c20
LP		 352 default:
353 assert_not_reached("Unknown input type");
354 }
355}
356
eb17e935 357static int setup_output(const ExecContext *context, int fileno, int socket_fd, const char *ident, const char *unit_id, bool apply_tty_stdin) {
4f2d528d
LP		 358 ExecOutput o;
359 ExecInput i;
47c1d80d 360 int r;
4f2d528d 361
80876c20
LP		 362 assert(context);
363 assert(ident);
364
1e3ad081 365 i = fixup_input(context->std_input, socket_fd, apply_tty_stdin);
03fd9c49 366 o = fixup_output(context->std_output, socket_fd);
4f2d528d 367
eb17e935
MS		 368 if (fileno == STDERR_FILENO) {
369 ExecOutput e;
370 e = fixup_output(context->std_error, socket_fd);
80876c20 371
eb17e935
MS		 372 /* This expects the input and output are already set up */
373
374 /* Don't change the stderr file descriptor if we inherit all
375 * the way and are not on a tty */
376 if (e == EXEC_OUTPUT_INHERIT &&
377 o == EXEC_OUTPUT_INHERIT &&
378 i == EXEC_INPUT_NULL &&
379 !is_terminal_input(context->std_input) &&
380 getppid () != 1)
381 return fileno;
382
383 /* Duplicate from stdout if possible */
384 if (e == o || e == EXEC_OUTPUT_INHERIT)
385 return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno;
071830ff 386
eb17e935 387 o = e;
80876c20 388
eb17e935 389 } else if (o == EXEC_OUTPUT_INHERIT) {
21d21ea4
LP		 390 /* If input got downgraded, inherit the original value */
391 if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input))
eb17e935 392 return open_terminal_as(tty_path(context), O_WRONLY, fileno);
21d21ea4 393
acb591e4 394 /* If the input is connected to anything that's not a /dev/null, inherit that... */
ff876e28 395 if (i != EXEC_INPUT_NULL)
eb17e935 396 return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
071830ff 397
acb591e4
LP		 398 /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */
399 if (getppid() != 1)
eb17e935 400 return fileno;
94f04347 401
eb17e935
MS		 402 /* We need to open /dev/null here anew, to get the right access mode. */
403 return open_null_as(O_WRONLY, fileno);
071830ff 404 }
94f04347 405
eb17e935 406 switch (o) {
80876c20
LP		 407
408 case EXEC_OUTPUT_NULL:
eb17e935 409 return open_null_as(O_WRONLY, fileno);
80876c20
LP		 410
411 case EXEC_OUTPUT_TTY:
4f2d528d 412 if (is_terminal_input(i))
eb17e935 413 return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
80876c20
LP		 414
415 /* We don't reset the terminal if this is just about output */
eb17e935 416 return open_terminal_as(tty_path(context), O_WRONLY, fileno);
80876c20
LP		 417
418 case EXEC_OUTPUT_SYSLOG:
28dbc1e8 419 case EXEC_OUTPUT_SYSLOG_AND_CONSOLE:
9a6bca7a 420 case EXEC_OUTPUT_KMSG:
28dbc1e8 421 case EXEC_OUTPUT_KMSG_AND_CONSOLE:
706343f4
LP		 422 case EXEC_OUTPUT_JOURNAL:
423 case EXEC_OUTPUT_JOURNAL_AND_CONSOLE:
eb17e935 424 r = connect_logger_as(context, o, ident, unit_id, fileno);
47c1d80d 425 if (r < 0) {
80cbda35
MS		 426 log_struct_unit(LOG_CRIT, unit_id,
427 "MESSAGE=Failed to connect std%s of %s to the journal socket: %s",
eb17e935 428 fileno == STDOUT_FILENO ? "out" : "err",
80cbda35
MS		 429 unit_id, strerror(-r),
430 "ERRNO=%d", -r,
431 NULL);
eb17e935 432 r = open_null_as(O_WRONLY, fileno);
47c1d80d
MS		 433 }
434 return r;
4f2d528d
LP		 435
436 case EXEC_OUTPUT_SOCKET:
437 assert(socket_fd >= 0);
eb17e935 438 return dup2(socket_fd, fileno) < 0 ? -errno : fileno;
94f04347
LP		 439
440 default:
80876c20 441 assert_not_reached("Unknown error type");
94f04347 442 }
071830ff
LP		 443}
444
02a51aba
LP		 445static int chown_terminal(int fd, uid_t uid) {
446 struct stat st;
447
448 assert(fd >= 0);
02a51aba
LP		 449
450 /* This might fail. What matters are the results. */
bab45044
LP		 451 (void) fchown(fd, uid, -1);
452 (void) fchmod(fd, TTY_MODE);
02a51aba
LP		 453
454 if (fstat(fd, &st) < 0)
455 return -errno;
456
d8b4e2e9 457 if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE)
02a51aba
LP		 458 return -EPERM;
459
460 return 0;
461}
462
af6da548 463static int setup_confirm_stdio(int *_saved_stdin,
80876c20
LP		 464 int *_saved_stdout) {
465 int fd = -1, saved_stdin, saved_stdout = -1, r;
466
80876c20
LP		 467 assert(_saved_stdin);
468 assert(_saved_stdout);
469
af6da548
LP		 470 saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3);
471 if (saved_stdin < 0)
472 return -errno;
80876c20 473
af6da548
LP		 474 saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3);
475 if (saved_stdout < 0) {
476 r = errno;
80876c20
LP		 477 goto fail;
478 }
479
af6da548
LP		 480 fd = acquire_terminal(
481 "/dev/console",
482 false,
483 false,
484 false,
485 DEFAULT_CONFIRM_USEC);
486 if (fd < 0) {
487 r = fd;
80876c20
LP		 488 goto fail;
489 }
490
af6da548
LP		 491 r = chown_terminal(fd, getuid());
492 if (r < 0)
02a51aba 493 goto fail;
02a51aba 494
80876c20 495 if (dup2(fd, STDIN_FILENO) < 0) {
af6da548 496 r = -errno;
80876c20
LP		 497 goto fail;
498 }
499
500 if (dup2(fd, STDOUT_FILENO) < 0) {
af6da548 501 r = -errno;
80876c20
LP		 502 goto fail;
503 }
504
505 if (fd >= 2)
03e334a1 506 safe_close(fd);
80876c20
LP		 507
508 *_saved_stdin = saved_stdin;
509 *_saved_stdout = saved_stdout;
510
511 return 0;
512
513fail:
03e334a1
LP		 514 safe_close(saved_stdout);
515 safe_close(saved_stdin);
516 safe_close(fd);
80876c20
LP		 517
518 return r;
519}
520
44b601bc 521_printf_(1, 2) static int write_confirm_message(const char *format, ...) {
03e334a1 522 _cleanup_close_ int fd = -1;
af6da548 523 va_list ap;
80876c20 524
af6da548 525 assert(format);
80876c20 526
af6da548
LP		 527 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
528 if (fd < 0)
529 return fd;
80876c20 530
af6da548
LP		 531 va_start(ap, format);
532 vdprintf(fd, format, ap);
533 va_end(ap);
80876c20 534
af6da548
LP		 535 return 0;
536}
80876c20 537
af6da548
LP		 538static int restore_confirm_stdio(int *saved_stdin,
539 int *saved_stdout) {
80876c20 540
af6da548 541 int r = 0;
80876c20 542
af6da548
LP		 543 assert(saved_stdin);
544 assert(saved_stdout);
545
546 release_terminal();
547
548 if (*saved_stdin >= 0)
80876c20 549 if (dup2(*saved_stdin, STDIN_FILENO) < 0)
af6da548 550 r = -errno;
80876c20 551
af6da548 552 if (*saved_stdout >= 0)
80876c20 553 if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
af6da548 554 r = -errno;
80876c20 555
03e334a1
LP		 556 safe_close(*saved_stdin);
557 safe_close(*saved_stdout);
af6da548
LP		 558
559 return r;
560}
561
562static int ask_for_confirmation(char *response, char **argv) {
563 int saved_stdout = -1, saved_stdin = -1, r;
564 char *line;
565
566 r = setup_confirm_stdio(&saved_stdin, &saved_stdout);
567 if (r < 0)
568 return r;
569
570 line = exec_command_line(argv);
571 if (!line)
572 return -ENOMEM;
573
574 r = ask(response, "yns", "Execute %s? [Yes, No, Skip] ", line);
575 free(line);
576
577 restore_confirm_stdio(&saved_stdin, &saved_stdout);
578
579 return r;
80876c20
LP		 580}
581
81a2b7ce
LP		 582static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) {
583 bool keep_groups = false;
584 int r;
585
586 assert(context);
587
35b8ca3a 588 /* Lookup and set GID and supplementary group list. Here too
81a2b7ce
LP		 589 * we avoid NSS lookups for gid=0. */
590
591 if (context->group || username) {
592
4b67834e
LP		 593 if (context->group) {
594 const char *g = context->group;
595
596 if ((r = get_group_creds(&g, &gid)) < 0)
81a2b7ce 597 return r;
4b67834e 598 }
81a2b7ce
LP		 599
600 /* First step, initialize groups from /etc/groups */
601 if (username && gid != 0) {
602 if (initgroups(username, gid) < 0)
603 return -errno;
604
605 keep_groups = true;
606 }
607
608 /* Second step, set our gids */
609 if (setresgid(gid, gid, gid) < 0)
610 return -errno;
611 }
612
613 if (context->supplementary_groups) {
614 int ngroups_max, k;
615 gid_t *gids;
616 char **i;
617
618 /* Final step, initialize any manually set supplementary groups */
da19d5c1 619 assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0);
81a2b7ce
LP		 620
621 if (!(gids = new(gid_t, ngroups_max)))
622 return -ENOMEM;
623
624 if (keep_groups) {
625 if ((k = getgroups(ngroups_max, gids)) < 0) {
626 free(gids);
627 return -errno;
628 }
629 } else
630 k = 0;
631
632 STRV_FOREACH(i, context->supplementary_groups) {
4b67834e 633 const char *g;
81a2b7ce
LP		 634
635 if (k >= ngroups_max) {
636 free(gids);
637 return -E2BIG;
638 }
639
4b67834e
LP		 640 g = *i;
641 r = get_group_creds(&g, gids+k);
642 if (r < 0) {
81a2b7ce
LP		 643 free(gids);
644 return r;
645 }
646
647 k++;
648 }
649
650 if (setgroups(k, gids) < 0) {
651 free(gids);
652 return -errno;
653 }
654
655 free(gids);
656 }
657
658 return 0;
659}
660
661static int enforce_user(const ExecContext *context, uid_t uid) {
81a2b7ce
LP		 662 assert(context);
663
664 /* Sets (but doesn't lookup) the uid and make sure we keep the
665 * capabilities while doing so. */
666
667 if (context->capabilities) {
5ce70e5b 668 _cleanup_cap_free_ cap_t d = NULL;
81a2b7ce
LP		 669 static const cap_value_t bits[] = {
670 CAP_SETUID, /* Necessary so that we can run setresuid() below */
671 CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */
672 };
673
674 /* First step: If we need to keep capabilities but
675 * drop privileges we need to make sure we keep our
cbb21cca 676 * caps, while we drop privileges. */
693ced48 677 if (uid != 0) {
cbb21cca 678 int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS;
693ced48
LP		 679
680 if (prctl(PR_GET_SECUREBITS) != sb)
681 if (prctl(PR_SET_SECUREBITS, sb) < 0)
682 return -errno;
683 }
81a2b7ce 684
35b8ca3a 685 /* Second step: set the capabilities. This will reduce
81a2b7ce
LP		 686 * the capabilities to the minimum we need. */
687
5ce70e5b
ZJS		 688 d = cap_dup(context->capabilities);
689 if (!d)
81a2b7ce
LP		 690 return -errno;
691
692 if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 ||
5ce70e5b
ZJS		 693 cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0)
694 return -errno;
81a2b7ce 695
5ce70e5b
ZJS		 696 if (cap_set_proc(d) < 0)
697 return -errno;
81a2b7ce
LP		 698 }
699
700 /* Third step: actually set the uids */
701 if (setresuid(uid, uid, uid) < 0)
702 return -errno;
703
704 /* At this point we should have all necessary capabilities but
705 are otherwise a normal user. However, the caps might got
706 corrupted due to the setresuid() so we need clean them up
707 later. This is done outside of this call. */
708
709 return 0;
710}
711
5b6319dc
LP		 712#ifdef HAVE_PAM
713
714static int null_conv(
715 int num_msg,
716 const struct pam_message **msg,
717 struct pam_response **resp,
718 void *appdata_ptr) {
719
720 /* We don't support conversations */
721
722 return PAM_CONV_ERR;
723}
724
725static int setup_pam(
726 const char *name,
727 const char *user,
940c5210 728 uid_t uid,
5b6319dc
LP		 729 const char *tty,
730 char ***pam_env,
731 int fds[], unsigned n_fds) {
732
733 static const struct pam_conv conv = {
734 .conv = null_conv,
735 .appdata_ptr = NULL
736 };
737
738 pam_handle_t *handle = NULL;
739 sigset_t ss, old_ss;
740 int pam_code = PAM_SUCCESS;
9ba35398 741 int err;
5b6319dc
LP		 742 char **e = NULL;
743 bool close_session = false;
744 pid_t pam_pid = 0, parent_pid;
970edce6 745 int flags = 0;
5b6319dc
LP		 746
747 assert(name);
748 assert(user);
749 assert(pam_env);
750
751 /* We set up PAM in the parent process, then fork. The child
35b8ca3a 752 * will then stay around until killed via PR_GET_PDEATHSIG or
5b6319dc
LP		 753 * systemd via the cgroup logic. It will then remove the PAM
754 * session again. The parent process will exec() the actual
755 * daemon. We do things this way to ensure that the main PID
756 * of the daemon is the one we initially fork()ed. */
757
970edce6
ZJS		 758 if (log_get_max_level() < LOG_PRI(LOG_DEBUG))
759 flags |= PAM_SILENT;
760
f546241b
ZJS		 761 pam_code = pam_start(name, user, &conv, &handle);
762 if (pam_code != PAM_SUCCESS) {
5b6319dc
LP		 763 handle = NULL;
764 goto fail;
765 }
766
f546241b
ZJS		 767 if (tty) {
768 pam_code = pam_set_item(handle, PAM_TTY, tty);
769 if (pam_code != PAM_SUCCESS)
5b6319dc 770 goto fail;
f546241b 771 }
5b6319dc 772
970edce6 773 pam_code = pam_acct_mgmt(handle, flags);
f546241b 774 if (pam_code != PAM_SUCCESS)
5b6319dc
LP		 775 goto fail;
776
970edce6 777 pam_code = pam_open_session(handle, flags);
f546241b 778 if (pam_code != PAM_SUCCESS)
5b6319dc
LP		 779 goto fail;
780
781 close_session = true;
782
f546241b
ZJS		 783 e = pam_getenvlist(handle);
784 if (!e) {
5b6319dc
LP		 785 pam_code = PAM_BUF_ERR;
786 goto fail;
787 }
788
789 /* Block SIGTERM, so that we know that it won't get lost in
790 * the child */
791 if (sigemptyset(&ss) < 0 ||
792 sigaddset(&ss, SIGTERM) < 0 ||
793 sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0)
794 goto fail;
795
796 parent_pid = getpid();
797
f546241b
ZJS		 798 pam_pid = fork();
799 if (pam_pid < 0)
5b6319dc
LP		 800 goto fail;
801
802 if (pam_pid == 0) {
803 int sig;
804 int r = EXIT_PAM;
805
806 /* The child's job is to reset the PAM session on
807 * termination */
808
809 /* This string must fit in 10 chars (i.e. the length
5d6b1584
LP		 810 * of "/sbin/init"), to look pretty in /bin/ps */
811 rename_process("(sd-pam)");
5b6319dc
LP		 812
813 /* Make sure we don't keep open the passed fds in this
814 child. We assume that otherwise only those fds are
815 open here that have been opened by PAM. */
816 close_many(fds, n_fds);
817
940c5210
AK		 818 /* Drop privileges - we don't need any to pam_close_session
819 * and this will make PR_SET_PDEATHSIG work in most cases.
820 * If this fails, ignore the error - but expect sd-pam threads
821 * to fail to exit normally */
822 if (setresuid(uid, uid, uid) < 0)
823 log_error("Error: Failed to setresuid() in sd-pam: %s", strerror(-r));
824
825 /* Wait until our parent died. This will only work if
826 * the above setresuid() succeeds, otherwise the kernel
827 * will not allow unprivileged parents kill their privileged
828 * children this way. We rely on the control groups kill logic
5b6319dc
LP		 829 * to do the rest for us. */
830 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
831 goto child_finish;
832
833 /* Check if our parent process might already have
834 * died? */
835 if (getppid() == parent_pid) {
3dead8d9
LP		 836 for (;;) {
837 if (sigwait(&ss, &sig) < 0) {
838 if (errno == EINTR)
839 continue;
840
841 goto child_finish;
842 }
5b6319dc 843
3dead8d9
LP		 844 assert(sig == SIGTERM);
845 break;
846 }
5b6319dc
LP		 847 }
848
3dead8d9 849 /* If our parent died we'll end the session */
f546241b 850 if (getppid() != parent_pid) {
970edce6 851 pam_code = pam_close_session(handle, flags);
f546241b 852 if (pam_code != PAM_SUCCESS)
5b6319dc 853 goto child_finish;
f546241b 854 }
5b6319dc
LP		 855
856 r = 0;
857
858 child_finish:
970edce6 859 pam_end(handle, pam_code | flags);
5b6319dc
LP		 860 _exit(r);
861 }
862
863 /* If the child was forked off successfully it will do all the
864 * cleanups, so forget about the handle here. */
865 handle = NULL;
866
3b8bddde 867 /* Unblock SIGTERM again in the parent */
5b6319dc
LP		 868 if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0)
869 goto fail;
870
871 /* We close the log explicitly here, since the PAM modules
872 * might have opened it, but we don't want this fd around. */
873 closelog();
874
aa87e624
LP		 875 *pam_env = e;
876 e = NULL;
877
5b6319dc
LP		 878 return 0;
879
880fail:
970edce6
ZJS		 881 if (pam_code != PAM_SUCCESS) {
882 log_error("PAM failed: %s", pam_strerror(handle, pam_code));
9ba35398 883 err = -EPERM; /* PAM errors do not map to errno */
970edce6
ZJS		 884 } else {
885 log_error("PAM failed: %m");
9ba35398 886 err = -errno;
970edce6 887 }
9ba35398 888
5b6319dc
LP		 889 if (handle) {
890 if (close_session)
970edce6 891 pam_code = pam_close_session(handle, flags);
5b6319dc 892
970edce6 893 pam_end(handle, pam_code | flags);
5b6319dc
LP		 894 }
895
896 strv_free(e);
897
898 closelog();
899
430c18ed 900 if (pam_pid > 1) {
5b6319dc 901 kill(pam_pid, SIGTERM);
430c18ed
LP		 902 kill(pam_pid, SIGCONT);
903 }
5b6319dc 904
9ba35398 905 return err;
5b6319dc
LP		 906}
907#endif
908
5d6b1584
LP		 909static void rename_process_from_path(const char *path) {
910 char process_name[11];
911 const char *p;
912 size_t l;
913
914 /* This resulting string must fit in 10 chars (i.e. the length
915 * of "/sbin/init") to look pretty in /bin/ps */
916
2b6bf07d 917 p = basename(path);
5d6b1584
LP		 918 if (isempty(p)) {
919 rename_process("(...)");
920 return;
921 }
922
923 l = strlen(p);
924 if (l > 8) {
925 /* The end of the process name is usually more
926 * interesting, since the first bit might just be
927 * "systemd-" */
928 p = p + l - 8;
929 l = 8;
930 }
931
932 process_name[0] = '(';
933 memcpy(process_name+1, p, l);
934 process_name[1+l] = ')';
935 process_name[1+l+1] = 0;
936
937 rename_process(process_name);
938}
939
c0467cf3 940#ifdef HAVE_SECCOMP
17df7223 941
c0467cf3 942static int apply_seccomp(ExecContext *c) {
17df7223
LP		 943 uint32_t negative_action, action;
944 scmp_filter_ctx *seccomp;
c0467cf3
RC		 945 Iterator i;
946 void *id;
17df7223 947 int r;
8351ceae 948
c0467cf3 949 assert(c);
8351ceae 950
17df7223
LP		 951 negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno);
952
953 seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW);
954 if (!seccomp)
955 return -ENOMEM;
8351ceae 956
e9642be2
LP		 957 if (c->syscall_archs) {
958
959 SET_FOREACH(id, c->syscall_archs, i) {
960 r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1);
961 if (r == -EEXIST)
962 continue;
7c66bae2
LP		 963 if (r < 0)
964 goto finish;
e9642be2 965 }
e9642be2 966
7c66bae2 967 } else {
e9642be2 968 r = seccomp_add_secondary_archs(seccomp);
7c66bae2
LP		 969 if (r < 0)
970 goto finish;
57183d11 971 }
8351ceae 972
57183d11 973 action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action;
17df7223
LP		 974 SET_FOREACH(id, c->syscall_filter, i) {
975 r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0);
7c66bae2
LP		 976 if (r < 0)
977 goto finish;
c0467cf3 978 }
8351ceae 979
7c66bae2
LP		 980 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
981 if (r < 0)
982 goto finish;
983
17df7223 984 r = seccomp_load(seccomp);
7c66bae2
LP		 985
986finish:
17df7223 987 seccomp_release(seccomp);
4298d0b5
LP		 988 return r;
989}
990
991static int apply_address_families(ExecContext *c) {
992 scmp_filter_ctx *seccomp;
993 Iterator i;
994 int r;
995
996 assert(c);
997
998 seccomp = seccomp_init(SCMP_ACT_ALLOW);
999 if (!seccomp)
1000 return -ENOMEM;
1001
1002 r = seccomp_add_secondary_archs(seccomp);
1003 if (r < 0)
1004 goto finish;
1005
1006 if (c->address_families_whitelist) {
1007 int af, first = 0, last = 0;
1008 void *afp;
1009
1010 /* If this is a whitelist, we first block the address
1011 * families that are out of range and then everything
1012 * that is not in the set. First, we find the lowest
1013 * and highest address family in the set. */
1014
1015 SET_FOREACH(afp, c->address_families, i) {
1016 af = PTR_TO_INT(afp);
17df7223 1017
4298d0b5
LP		 1018 if (af <= 0 || af >= af_max())
1019 continue;
1020
1021 if (first == 0 || af < first)
1022 first = af;
1023
1024 if (last == 0 || af > last)
1025 last = af;
1026 }
1027
1028 assert((first == 0) == (last == 0));
1029
1030 if (first == 0) {
1031
1032 /* No entries in the valid range, block everything */
1033 r = seccomp_rule_add(
1034 seccomp,
1035 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1036 SCMP_SYS(socket),
1037 0);
1038 if (r < 0)
1039 goto finish;
1040
1041 } else {
1042
1043 /* Block everything below the first entry */
1044 r = seccomp_rule_add(
1045 seccomp,
1046 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1047 SCMP_SYS(socket),
1048 1,
1049 SCMP_A0(SCMP_CMP_LT, first));
1050 if (r < 0)
1051 goto finish;
1052
1053 /* Block everything above the last entry */
1054 r = seccomp_rule_add(
1055 seccomp,
1056 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1057 SCMP_SYS(socket),
1058 1,
1059 SCMP_A0(SCMP_CMP_GT, last));
1060 if (r < 0)
1061 goto finish;
1062
1063 /* Block everything between the first and last
1064 * entry */
1065 for (af = 1; af < af_max(); af++) {
1066
1067 if (set_contains(c->address_families, INT_TO_PTR(af)))
1068 continue;
1069
1070 r = seccomp_rule_add(
1071 seccomp,
1072 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1073 SCMP_SYS(socket),
1074 1,
1075 SCMP_A0(SCMP_CMP_EQ, af));
1076 if (r < 0)
1077 goto finish;
1078 }
1079 }
1080
1081 } else {
1082 void *af;
1083
1084 /* If this is a blacklist, then generate one rule for
1085 * each address family that are then combined in OR
1086 * checks. */
1087
1088 SET_FOREACH(af, c->address_families, i) {
1089
1090 r = seccomp_rule_add(
1091 seccomp,
1092 SCMP_ACT_ERRNO(EPROTONOSUPPORT),
1093 SCMP_SYS(socket),
1094 1,
1095 SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af)));
1096 if (r < 0)
1097 goto finish;
1098 }
1099 }
1100
1101 r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
1102 if (r < 0)
1103 goto finish;
1104
1105 r = seccomp_load(seccomp);
1106
1107finish:
1108 seccomp_release(seccomp);
17df7223 1109 return r;
8351ceae 1110}
4298d0b5 1111
c0467cf3 1112#endif
8351ceae 1113
31a7eb86
ZJS		 1114static void do_idle_pipe_dance(int idle_pipe[4]) {
1115 assert(idle_pipe);
1116
03e334a1
LP		 1117
1118 safe_close(idle_pipe[1]);
1119 safe_close(idle_pipe[2]);
31a7eb86
ZJS		 1120
1121 if (idle_pipe[0] >= 0) {
1122 int r;
1123
1124 r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC);
1125
1126 if (idle_pipe[3] >= 0 && r == 0 /* timeout */) {
1127 /* Signal systemd that we are bored and want to continue. */
1128 write(idle_pipe[3], "x", 1);
1129
1130 /* Wait for systemd to react to the signal above. */
1131 fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC);
1132 }
1133
03e334a1 1134 safe_close(idle_pipe[0]);
31a7eb86
ZJS		 1135
1136 }
1137
03e334a1 1138 safe_close(idle_pipe[3]);
31a7eb86
ZJS		 1139}
1140
7cae38c4
LP		 1141static int build_environment(
1142 ExecContext *c,
1143 unsigned n_fds,
09812eb7 1144 usec_t watchdog_usec,
7cae38c4
LP		 1145 const char *home,
1146 const char *username,
1147 const char *shell,
1148 char ***ret) {
1149
1150 _cleanup_strv_free_ char **our_env = NULL;
1151 unsigned n_env = 0;
1152 char *x;
1153
1154 assert(c);
1155 assert(ret);
1156
09812eb7 1157 our_env = new0(char*, 10);
7cae38c4
LP		 1158 if (!our_env)
1159 return -ENOMEM;
1160
1161 if (n_fds > 0) {
ccd06097 1162 if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0)
7cae38c4
LP		 1163 return -ENOMEM;
1164 our_env[n_env++] = x;
1165
1166 if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0)
1167 return -ENOMEM;
1168 our_env[n_env++] = x;
1169 }
1170
09812eb7 1171 if (watchdog_usec > 0) {
ccd06097 1172 if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0)
09812eb7
LP		 1173 return -ENOMEM;
1174 our_env[n_env++] = x;
1175
1176 if (asprintf(&x, "WATCHDOG_USEC=%llu", (unsigned long long) watchdog_usec) < 0)
1177 return -ENOMEM;
1178 our_env[n_env++] = x;
1179 }
1180
7cae38c4
LP		 1181 if (home) {
1182 x = strappend("HOME=", home);
1183 if (!x)
1184 return -ENOMEM;
1185 our_env[n_env++] = x;
1186 }
1187
1188 if (username) {
1189 x = strappend("LOGNAME=", username);
1190 if (!x)
1191 return -ENOMEM;
1192 our_env[n_env++] = x;
1193
1194 x = strappend("USER=", username);
1195 if (!x)
1196 return -ENOMEM;
1197 our_env[n_env++] = x;
1198 }
1199
1200 if (shell) {
1201 x = strappend("SHELL=", shell);
1202 if (!x)
1203 return -ENOMEM;
1204 our_env[n_env++] = x;
1205 }
1206
1207 if (is_terminal_input(c->std_input) ||
1208 c->std_output == EXEC_OUTPUT_TTY ||
1209 c->std_error == EXEC_OUTPUT_TTY ||
1210 c->tty_path) {
1211
1212 x = strdup(default_term_for_tty(tty_path(c)));
1213 if (!x)
1214 return -ENOMEM;
1215 our_env[n_env++] = x;
1216 }
1217
1218 our_env[n_env++] = NULL;
09812eb7 1219 assert(n_env <= 10);
7cae38c4
LP		 1220
1221 *ret = our_env;
1222 our_env = NULL;
1223
1224 return 0;
1225}
1226
9fb86720 1227int exec_spawn(ExecCommand *command,
9e2f7c11 1228 char **argv,
c17ec25e 1229 ExecContext *context,
c2748801 1230 int fds[], unsigned n_fds,
1137a57c 1231 char **environment,
81a2b7ce
LP		 1232 bool apply_permissions,
1233 bool apply_chroot,
1e3ad081 1234 bool apply_tty_stdin,
80876c20 1235 bool confirm_spawn,
13b84ec7 1236 CGroupControllerMask cgroup_supported,
4ad49000 1237 const char *cgroup_path,
e66cf1a3 1238 const char *runtime_prefix,
62bca2c6 1239 const char *unit_id,
09812eb7 1240 usec_t watchdog_usec,
31a7eb86 1241 int idle_pipe[4],
613b411c 1242 ExecRuntime *runtime,
81a2b7ce
LP		 1243 pid_t *ret) {
1244
4ad49000
LP		 1245 _cleanup_strv_free_ char **files_env = NULL;
1246 int socket_fd;
1247 char *line;
034c6ed7 1248 pid_t pid;
8e274523 1249 int r;
034c6ed7 1250
5cb5a6ff
LP		 1251 assert(command);
1252 assert(context);
1253 assert(ret);
034c6ed7
LP		 1254 assert(fds || n_fds <= 0);
1255
4f2d528d
LP		 1256 if (context->std_input == EXEC_INPUT_SOCKET ||
1257 context->std_output == EXEC_OUTPUT_SOCKET ||
1258 context->std_error == EXEC_OUTPUT_SOCKET) {
1259
1260 if (n_fds != 1)
1261 return -EINVAL;
1262
1263 socket_fd = fds[0];
1264
1265 fds = NULL;
1266 n_fds = 0;
1267 } else
1268 socket_fd = -1;
1269
b66871da
ZJS		 1270 r = exec_context_load_environment(context, &files_env);
1271 if (r < 0) {
bbc9006e
MT		 1272 log_struct_unit(LOG_ERR,
1273 unit_id,
23635a85
ZJS		 1274 "MESSAGE=Failed to load environment files: %s", strerror(-r),
1275 "ERRNO=%d", -r,
1276 NULL);
8c7be95e
LP		 1277 return r;
1278 }
1279
9e2f7c11
LP		 1280 if (!argv)
1281 argv = command->argv;
1282
af6da548 1283 line = exec_command_line(argv);
b66871da
ZJS		 1284 if (!line)
1285 return log_oom();
1a63a750 1286
bbc9006e 1287 log_struct_unit(LOG_DEBUG,
099a804b
LP		 1288 unit_id,
1289 "EXECUTABLE=%s", command->path,
1290 "MESSAGE=About to execute: %s", line,
1291 NULL);
1a63a750 1292 free(line);
acbb0225 1293
b66871da
ZJS		 1294 pid = fork();
1295 if (pid < 0)
1296 return -errno;
034c6ed7
LP		 1297
1298 if (pid == 0) {
613b411c 1299 _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
59fccd82 1300 const char *username = NULL, *home = NULL, *shell = NULL;
7cae38c4 1301 unsigned n_dont_close = 0;
613b411c 1302 int dont_close[n_fds + 3];
81a2b7ce
LP		 1303 uid_t uid = (uid_t) -1;
1304 gid_t gid = (gid_t) -1;
613b411c
LP		 1305 sigset_t ss;
1306 int i, err;
309bff19 1307
034c6ed7 1308 /* child */
5cb5a6ff 1309
5d6b1584 1310 rename_process_from_path(command->path);
5b6319dc 1311
1b91d3e8
LP		 1312 /* We reset exactly these signals, since they are the
1313 * only ones we set to SIG_IGN in the main daemon. All
1314 * others we leave untouched because we set them to
1315 * SIG_DFL or a valid handler initially, both of which
1316 * will be demoted to SIG_DFL. */
1317 default_signals(SIGNALS_CRASH_HANDLER,
9a34ec5f 1318 SIGNALS_IGNORE, -1);
7b683879 1319
353e12c2
LP		 1320 if (context->ignore_sigpipe)
1321 ignore_signals(SIGPIPE, -1);
1322
1323 assert_se(sigemptyset(&ss) == 0);
1324 if (sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
4c2630eb 1325 err = -errno;
309bff19 1326 r = EXIT_SIGNAL_MASK;
8c7be95e 1327 goto fail_child;
309bff19
LP		 1328 }
1329
31a7eb86
ZJS		 1330 if (idle_pipe)
1331 do_idle_pipe_dance(idle_pipe);
f2b68789 1332
85d73053
LP		 1333 /* Close sockets very early to make sure we don't
1334 * block init reexecution because it cannot bind its
1335 * sockets */
4d8a7798 1336 log_forget_fds();
613b411c
LP		 1337
1338 if (socket_fd >= 0)
1339 dont_close[n_dont_close++] = socket_fd;
1340 if (n_fds > 0) {
1341 memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds);
1342 n_dont_close += n_fds;
1343 }
1344 if (runtime) {
1345 if (runtime->netns_storage_socket[0] >= 0)
1346 dont_close[n_dont_close++] = runtime->netns_storage_socket[0];
1347 if (runtime->netns_storage_socket[1] >= 0)
1348 dont_close[n_dont_close++] = runtime->netns_storage_socket[1];
1349 }
1350
1351 err = close_all_fds(dont_close, n_dont_close);
4c2630eb 1352 if (err < 0) {
fc9b2a84 1353 r = EXIT_FDS;
8c7be95e 1354 goto fail_child;
fc9b2a84
LP		 1355 }
1356
74922904 1357 if (!context->same_pgrp)
8d567588 1358 if (setsid() < 0) {
4c2630eb 1359 err = -errno;
8d567588 1360 r = EXIT_SETSID;
8c7be95e 1361 goto fail_child;
8d567588 1362 }
80876c20 1363
6ea832a2
LP		 1364 exec_context_tty_reset(context);
1365
af6da548 1366 if (confirm_spawn) {
80876c20
LP		 1367 char response;
1368
af6da548
LP		 1369 err = ask_for_confirmation(&response, argv);
1370 if (err == -ETIMEDOUT)
1371 write_confirm_message("Confirmation question timed out, assuming positive response.\n");
1372 else if (err < 0)
1373 write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-err));
1374 else if (response == 's') {
1375 write_confirm_message("Skipping execution.\n");
4c2630eb 1376 err = -ECANCELED;
80876c20 1377 r = EXIT_CONFIRM;
8c7be95e 1378 goto fail_child;
af6da548
LP		 1379 } else if (response == 'n') {
1380 write_confirm_message("Failing execution.\n");
4c2630eb 1381 err = r = 0;
8c7be95e 1382 goto fail_child;
ee2b4894 1383 }
034c6ed7
LP		 1384 }
1385
da726a4d
LP		 1386 /* If a socket is connected to STDIN/STDOUT/STDERR, we
1387 * must sure to drop O_NONBLOCK */
1388 if (socket_fd >= 0)
1389 fd_nonblock(socket_fd, false);
1390
af6da548
LP		 1391 err = setup_input(context, socket_fd, apply_tty_stdin);
1392 if (err < 0) {
1393 r = EXIT_STDIN;
1394 goto fail_child;
4c2630eb 1395 }
9eba9da4 1396
2b6bf07d 1397 err = setup_output(context, STDOUT_FILENO, socket_fd, basename(command->path), unit_id, apply_tty_stdin);
af6da548
LP		 1398 if (err < 0) {
1399 r = EXIT_STDOUT;
1400 goto fail_child;
4c2630eb 1401 }
94f04347 1402
2b6bf07d 1403 err = setup_output(context, STDERR_FILENO, socket_fd, basename(command->path), unit_id, apply_tty_stdin);
4c2630eb 1404 if (err < 0) {
80876c20 1405 r = EXIT_STDERR;
8c7be95e 1406 goto fail_child;
071830ff
LP		 1407 }
1408
4ad49000 1409 if (cgroup_path) {
13b84ec7 1410 err = cg_attach_everywhere(cgroup_supported, cgroup_path, 0);
4c2630eb 1411 if (err < 0) {
8e274523 1412 r = EXIT_CGROUP;
8c7be95e 1413 goto fail_child;
8e274523 1414 }
4c2630eb 1415 }
8e274523 1416
dd6c17b1 1417 if (context->oom_score_adjust_set) {
fb33a393 1418 char t[16];
034c6ed7 1419
dd6c17b1 1420 snprintf(t, sizeof(t), "%i", context->oom_score_adjust);
fb33a393 1421 char_array_0(t);
034c6ed7 1422
574d5f2d 1423 if (write_string_file("/proc/self/oom_score_adj", t) < 0) {
8600c525
KS		 1424 err = -errno;
1425 r = EXIT_OOM_ADJUST;
1426 goto fail_child;
fb33a393 1427 }
034c6ed7
LP		 1428 }
1429
fb33a393
LP		 1430 if (context->nice_set)
1431 if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
4c2630eb 1432 err = -errno;
fb33a393 1433 r = EXIT_NICE;
8c7be95e 1434 goto fail_child;
fb33a393
LP		 1435 }
1436
94f04347 1437 if (context->cpu_sched_set) {
b92bea5d
ZJS		 1438 struct sched_param param = {
1439 .sched_priority = context->cpu_sched_priority,
1440 };
94f04347 1441
e62d8c39
ZJS		 1442 r = sched_setscheduler(0,
1443 context->cpu_sched_policy |
1444 (context->cpu_sched_reset_on_fork ?
1445 SCHED_RESET_ON_FORK : 0),
1446 &param);
1447 if (r < 0) {
4c2630eb 1448 err = -errno;
94f04347 1449 r = EXIT_SETSCHEDULER;
8c7be95e 1450 goto fail_child;
94f04347
LP		 1451 }
1452 }
1453
82c121a4
LP		 1454 if (context->cpuset)
1455 if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) {
4c2630eb 1456 err = -errno;
94f04347 1457 r = EXIT_CPUAFFINITY;
8c7be95e 1458 goto fail_child;
94f04347
LP		 1459 }
1460
9eba9da4
LP		 1461 if (context->ioprio_set)
1462 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
4c2630eb 1463 err = -errno;
9eba9da4 1464 r = EXIT_IOPRIO;
8c7be95e 1465 goto fail_child;
9eba9da4
LP		 1466 }
1467
d88a251b 1468 if (context->timer_slack_nsec != (nsec_t) -1)
03fae018 1469 if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) {
4c2630eb 1470 err = -errno;
94f04347 1471 r = EXIT_TIMERSLACK;
8c7be95e 1472 goto fail_child;
94f04347
LP		 1473 }
1474
ac45f971
LP		 1475 if (context->personality != 0xffffffffUL)
1476 if (personality(context->personality) < 0) {
1477 err = -errno;
1478 r = EXIT_PERSONALITY;
1479 goto fail_child;
1480 }
1481
169c1bda 1482 if (context->utmp_id)
0ad26e09 1483 utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path);
169c1bda 1484
81a2b7ce
LP		 1485 if (context->user) {
1486 username = context->user;
59fccd82 1487 err = get_user_creds(&username, &uid, &gid, &home, &shell);
4c2630eb 1488 if (err < 0) {
81a2b7ce 1489 r = EXIT_USER;
8c7be95e 1490 goto fail_child;
81a2b7ce 1491 }
d8b4e2e9 1492
4c2630eb
MS		 1493 if (is_terminal_input(context->std_input)) {
1494 err = chown_terminal(STDIN_FILENO, uid);
1495 if (err < 0) {
d8b4e2e9 1496 r = EXIT_STDIN;
8c7be95e 1497 goto fail_child;
d8b4e2e9 1498 }
4c2630eb 1499 }
81a2b7ce
LP		 1500 }
1501
8aa75193
LP		 1502#ifdef HAVE_PAM
1503 if (cgroup_path && context->user && context->pam_name) {
1504 err = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, 0644, uid, gid);
1505 if (err < 0) {
1506 r = EXIT_CGROUP;
1507 goto fail_child;
1508 }
1509
1510
1511 err = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, 0755, uid, gid);
1512 if (err < 0) {
1513 r = EXIT_CGROUP;
1514 goto fail_child;
1515 }
1516 }
1517#endif
1518
e66cf1a3
LP		 1519 if (!strv_isempty(context->runtime_directory) && runtime_prefix) {
1520 char **rt;
1521
1522 STRV_FOREACH(rt, context->runtime_directory) {
1523 _cleanup_free_ char *p;
1524
1525 p = strjoin(runtime_prefix, "/", *rt, NULL);
1526 if (!p) {
1527 r = EXIT_RUNTIME_DIRECTORY;
1528 err = -ENOMEM;
1529 goto fail_child;
1530 }
1531
1532 err = mkdir_safe(p, context->runtime_directory_mode, uid, gid);
1533 if (err < 0) {
1534 r = EXIT_RUNTIME_DIRECTORY;
1535 goto fail_child;
1536 }
1537 }
1538 }
1539
4c2630eb
MS		 1540 if (apply_permissions) {
1541 err = enforce_groups(context, username, gid);
1542 if (err < 0) {
3b8bddde
LP		 1543 r = EXIT_GROUP;
1544 goto fail_child;
1545 }
4c2630eb 1546 }
3b8bddde
LP		 1547
1548 umask(context->umask);
1549
5b6319dc 1550#ifdef HAVE_PAM
b7848021 1551 if (apply_permissions && context->pam_name && username) {
940c5210 1552 err = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds);
4c2630eb 1553 if (err < 0) {
5b6319dc 1554 r = EXIT_PAM;
8c7be95e 1555 goto fail_child;
5b6319dc
LP		 1556 }
1557 }
1558#endif
613b411c
LP		 1559 if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) {
1560 err = setup_netns(runtime->netns_storage_socket);
1561 if (err < 0) {
ff01d048
LP		 1562 r = EXIT_NETWORK;
1563 goto fail_child;
1564 }
ff01d048 1565 }
5b6319dc 1566
613b411c
LP		 1567 if (!strv_isempty(context->read_write_dirs) ||
1568 !strv_isempty(context->read_only_dirs) ||
1569 !strv_isempty(context->inaccessible_dirs) ||
ac0930c8 1570 context->mount_flags != 0 ||
7f112f50
LP		 1571 (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) ||
1572 context->private_devices) {
613b411c
LP		 1573
1574 char *tmp = NULL, *var = NULL;
1575
1576 /* The runtime struct only contains the parent
1577 * of the private /tmp, which is
1578 * non-accessible to world users. Inside of it
1579 * there's a /tmp that is sticky, and that's
1580 * the one we want to use here. */
1581
1582 if (context->private_tmp && runtime) {
1583 if (runtime->tmp_dir)
1584 tmp = strappenda(runtime->tmp_dir, "/tmp");
1585 if (runtime->var_tmp_dir)
1586 var = strappenda(runtime->var_tmp_dir, "/tmp");
1587 }
1588
1589 err = setup_namespace(
1590 context->read_write_dirs,
1591 context->read_only_dirs,
1592 context->inaccessible_dirs,
1593 tmp,
1594 var,
7f112f50 1595 context->private_devices,
613b411c
LP		 1596 context->mount_flags);
1597
4c2630eb
MS		 1598 if (err < 0) {
1599 r = EXIT_NAMESPACE;
8c7be95e 1600 goto fail_child;
4c2630eb
MS		 1601 }
1602 }
04aa0cb9 1603
81a2b7ce
LP		 1604 if (apply_chroot) {
1605 if (context->root_directory)
1606 if (chroot(context->root_directory) < 0) {
4c2630eb 1607 err = -errno;
81a2b7ce 1608 r = EXIT_CHROOT;
8c7be95e 1609 goto fail_child;
81a2b7ce
LP		 1610 }
1611
1612 if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
4c2630eb 1613 err = -errno;
81a2b7ce 1614 r = EXIT_CHDIR;
8c7be95e 1615 goto fail_child;
81a2b7ce
LP		 1616 }
1617 } else {
7fd1b19b 1618 _cleanup_free_ char *d = NULL;
81a2b7ce
LP		 1619
1620 if (asprintf(&d, "%s/%s",
1621 context->root_directory ? context->root_directory : "",
1622 context->working_directory ? context->working_directory : "") < 0) {
4c2630eb 1623 err = -ENOMEM;
81a2b7ce 1624 r = EXIT_MEMORY;
8c7be95e 1625 goto fail_child;
81a2b7ce
LP		 1626 }
1627
1628 if (chdir(d) < 0) {
4c2630eb 1629 err = -errno;
81a2b7ce 1630 r = EXIT_CHDIR;
8c7be95e 1631 goto fail_child;
81a2b7ce 1632 }
81a2b7ce
LP		 1633 }
1634
fc9b2a84
LP		 1635 /* We repeat the fd closing here, to make sure that
1636 * nothing is leaked from the PAM modules */
4c2630eb
MS		 1637 err = close_all_fds(fds, n_fds);
1638 if (err >= 0)
1639 err = shift_fds(fds, n_fds);
1640 if (err >= 0)
1641 err = flags_fds(fds, n_fds, context->non_blocking);
1642 if (err < 0) {
034c6ed7 1643 r = EXIT_FDS;
8c7be95e 1644 goto fail_child;
034c6ed7
LP		 1645 }
1646
81a2b7ce 1647 if (apply_permissions) {
034c6ed7 1648
517d56b1 1649 for (i = 0; i < _RLIMIT_MAX; i++) {
81a2b7ce
LP		 1650 if (!context->rlimit[i])
1651 continue;
1652
68faf98c 1653 if (setrlimit_closest(i, context->rlimit[i]) < 0) {
4c2630eb 1654 err = -errno;
81a2b7ce 1655 r = EXIT_LIMITS;
8c7be95e 1656 goto fail_child;
81a2b7ce 1657 }
034c6ed7 1658 }
034c6ed7 1659
4c2630eb 1660 if (context->capability_bounding_set_drop) {
ec8927ca 1661 err = capability_bounding_set_drop(context->capability_bounding_set_drop, false);
4c2630eb 1662 if (err < 0) {
73090dc8
LP		 1663 r = EXIT_CAPABILITIES;
1664 goto fail_child;
1665 }
4c2630eb 1666 }
260abb78 1667
4c2630eb
MS		 1668 if (context->user) {
1669 err = enforce_user(context, uid);
1670 if (err < 0) {
81a2b7ce 1671 r = EXIT_USER;
8c7be95e 1672 goto fail_child;
81a2b7ce 1673 }
4c2630eb 1674 }
81a2b7ce 1675
35b8ca3a 1676 /* PR_GET_SECUREBITS is not privileged, while
693ced48
LP		 1677 * PR_SET_SECUREBITS is. So to suppress
1678 * potential EPERMs we'll try not to call
1679 * PR_SET_SECUREBITS unless necessary. */
1680 if (prctl(PR_GET_SECUREBITS) != context->secure_bits)
1681 if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
4c2630eb 1682 err = -errno;
693ced48 1683 r = EXIT_SECUREBITS;
8c7be95e 1684 goto fail_child;
693ced48 1685 }
81a2b7ce
LP		 1686
1687 if (context->capabilities)
1688 if (cap_set_proc(context->capabilities) < 0) {
4c2630eb 1689 err = -errno;
81a2b7ce 1690 r = EXIT_CAPABILITIES;
8c7be95e 1691 goto fail_child;
81a2b7ce 1692 }
8351ceae
LP		 1693
1694 if (context->no_new_privileges)
1695 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
1696 err = -errno;
1697 r = EXIT_NO_NEW_PRIVILEGES;
1698 goto fail_child;
1699 }
1700
c0467cf3 1701#ifdef HAVE_SECCOMP
f513e420
LP		 1702 if (context->address_families_whitelist ||
1703 !set_isempty(context->address_families)) {
4298d0b5
LP		 1704 err = apply_address_families(context);
1705 if (err < 0) {
1706 r = EXIT_ADDRESS_FAMILIES;
1707 goto fail_child;
1708 }
1709 }
1710
f513e420
LP		 1711 if (context->syscall_whitelist ||
1712 !set_isempty(context->syscall_filter) ||
1713 !set_isempty(context->syscall_archs)) {
c0467cf3 1714 err = apply_seccomp(context);
8351ceae
LP		 1715 if (err < 0) {
1716 r = EXIT_SECCOMP;
1717 goto fail_child;
1718 }
1719 }
c0467cf3 1720#endif
17df7223 1721
7b52a628 1722#ifdef HAVE_SELINUX
5c56a259 1723 if (context->selinux_context && use_selinux()) {
5f8640fb
LP		 1724 err = setexeccon(context->selinux_context);
1725 if (err < 0 && !context->selinux_context_ignore) {
7b52a628
MS		 1726 r = EXIT_SELINUX_CONTEXT;
1727 goto fail_child;
1728 }
1729 }
1730#endif
eef65bf3
MS		 1731
1732#ifdef HAVE_APPARMOR
1733 if (context->apparmor_profile && use_apparmor()) {
1734 err = aa_change_onexec(context->apparmor_profile);
1735 if (err < 0 && !context->apparmor_profile_ignore) {
1736 r = EXIT_APPARMOR_PROFILE;
1737 goto fail_child;
1738 }
1739 }
1740#endif
94f04347
LP		 1741 }
1742
09812eb7 1743 err = build_environment(context, n_fds, watchdog_usec, home, username, shell, &our_env);
7cae38c4 1744 if (r < 0) {
81a2b7ce 1745 r = EXIT_MEMORY;
8c7be95e 1746 goto fail_child;
81a2b7ce 1747 }
034c6ed7 1748
e62d8c39
ZJS		 1749 final_env = strv_env_merge(5,
1750 environment,
1751 our_env,
1752 context->environment,
1753 files_env,
1754 pam_env,
1755 NULL);
1756 if (!final_env) {
4c2630eb 1757 err = -ENOMEM;
81a2b7ce 1758 r = EXIT_MEMORY;
8c7be95e 1759 goto fail_child;
81a2b7ce 1760 }
034c6ed7 1761
e62d8c39
ZJS		 1762 final_argv = replace_env_argv(argv, final_env);
1763 if (!final_argv) {
4c2630eb 1764 err = -ENOMEM;
fab56fc5 1765 r = EXIT_MEMORY;
8c7be95e 1766 goto fail_child;
fab56fc5
LP		 1767 }
1768
a6ff950e
LP		 1769 final_env = strv_env_clean(final_env);
1770
03bb799e
HH		 1771 if (_unlikely_(log_get_max_level() >= LOG_PRI(LOG_DEBUG))) {
1772 line = exec_command_line(final_argv);
1773 if (line) {
1774 log_open();
1775 log_struct_unit(LOG_DEBUG,
1776 unit_id,
1777 "EXECUTABLE=%s", command->path,
099a804b
LP		 1778 "MESSAGE=Executing: %s", line,
1779 NULL);
03bb799e
HH		 1780 log_close();
1781 free(line);
1782 line = NULL;
1783 }
1784 }
fab56fc5 1785 execve(command->path, final_argv, final_env);
4c2630eb 1786 err = -errno;
034c6ed7
LP		 1787 r = EXIT_EXEC;
1788
8c7be95e 1789 fail_child:
4c2630eb
MS		 1790 if (r != 0) {
1791 log_open();
23635a85
ZJS		 1792 log_struct(LOG_ERR, MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED),
1793 "EXECUTABLE=%s", command->path,
1794 "MESSAGE=Failed at step %s spawning %s: %s",
1795 exit_status_to_string(r, EXIT_STATUS_SYSTEMD),
1796 command->path, strerror(-err),
1797 "ERRNO=%d", -err,
1798 NULL);
1799 log_close();
4c2630eb
MS		 1800 }
1801
034c6ed7
LP		 1802 _exit(r);
1803 }
1804
bbc9006e 1805 log_struct_unit(LOG_DEBUG,
e62d8c39 1806 unit_id,
ccd06097
ZJS		 1807 "MESSAGE=Forked %s as "PID_FMT,
1808 command->path, pid,
e62d8c39 1809 NULL);
23635a85 1810
80876c20
LP		 1811 /* We add the new process to the cgroup both in the child (so
1812 * that we can be sure that no user code is ever executed
1813 * outside of the cgroup) and in the parent (so that we can be
1814 * sure that when we kill the cgroup the process will be
1815 * killed too). */
4ad49000
LP		 1816 if (cgroup_path)
1817 cg_attach(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, pid);
2da3263a 1818
b58b4116 1819 exec_status_start(&command->exec_status, pid);
9fb86720 1820
034c6ed7 1821 *ret = pid;
5cb5a6ff
LP		 1822 return 0;
1823}
1824
034c6ed7
LP		 1825void exec_context_init(ExecContext *c) {
1826 assert(c);
1827
4c12626c 1828 c->umask = 0022;
9eba9da4 1829 c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
94f04347 1830 c->cpu_sched_policy = SCHED_OTHER;
071830ff 1831 c->syslog_priority = LOG_DAEMON|LOG_INFO;
74922904 1832 c->syslog_level_prefix = true;
353e12c2 1833 c->ignore_sigpipe = true;
d88a251b 1834 c->timer_slack_nsec = (nsec_t) -1;
ac45f971 1835 c->personality = 0xffffffffUL;
e66cf1a3 1836 c->runtime_directory_mode = 0755;
034c6ed7
LP		 1837}
1838
613b411c 1839void exec_context_done(ExecContext *c) {
5cb5a6ff
LP		 1840 unsigned l;
1841
1842 assert(c);
1843
1844 strv_free(c->environment);
034c6ed7 1845 c->environment = NULL;
5cb5a6ff 1846
8c7be95e
LP		 1847 strv_free(c->environment_files);
1848 c->environment_files = NULL;
1849
034c6ed7 1850 for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
5cb5a6ff 1851 free(c->rlimit[l]);
034c6ed7
LP		 1852 c->rlimit[l] = NULL;
1853 }
1854
9eba9da4
LP		 1855 free(c->working_directory);
1856 c->working_directory = NULL;
1857 free(c->root_directory);
1858 c->root_directory = NULL;
5cb5a6ff 1859
80876c20
LP		 1860 free(c->tty_path);
1861 c->tty_path = NULL;
1862
071830ff
LP		 1863 free(c->syslog_identifier);
1864 c->syslog_identifier = NULL;
1865
5cb5a6ff 1866 free(c->user);
034c6ed7
LP		 1867 c->user = NULL;
1868
5cb5a6ff 1869 free(c->group);
034c6ed7
LP		 1870 c->group = NULL;
1871
1872 strv_free(c->supplementary_groups);
1873 c->supplementary_groups = NULL;
94f04347 1874
5b6319dc
LP		 1875 free(c->pam_name);
1876 c->pam_name = NULL;
1877
94f04347
LP		 1878 if (c->capabilities) {
1879 cap_free(c->capabilities);
1880 c->capabilities = NULL;
1881 }
15ae422b
LP		 1882
1883 strv_free(c->read_only_dirs);
1884 c->read_only_dirs = NULL;
1885
1886 strv_free(c->read_write_dirs);
1887 c->read_write_dirs = NULL;
1888
1889 strv_free(c->inaccessible_dirs);
1890 c->inaccessible_dirs = NULL;
82c121a4
LP		 1891
1892 if (c->cpuset)
1893 CPU_FREE(c->cpuset);
86a3475b
LP		 1894
1895 free(c->utmp_id);
1896 c->utmp_id = NULL;
b9a0e010 1897
7b52a628
MS		 1898 free(c->selinux_context);
1899 c->selinux_context = NULL;
1900
eef65bf3
MS		 1901 free(c->apparmor_profile);
1902 c->apparmor_profile = NULL;
1903
17df7223
LP		 1904 set_free(c->syscall_filter);
1905 c->syscall_filter = NULL;
57183d11
LP		 1906
1907 set_free(c->syscall_archs);
1908 c->syscall_archs = NULL;
4298d0b5
LP		 1909
1910 set_free(c->address_families);
1911 c->address_families = NULL;
e66cf1a3
LP		 1912
1913 strv_free(c->runtime_directory);
1914 c->runtime_directory = NULL;
1915}
1916
1917int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) {
1918 char **i;
1919
1920 assert(c);
1921
1922 if (!runtime_prefix)
1923 return 0;
1924
1925 STRV_FOREACH(i, c->runtime_directory) {
1926 _cleanup_free_ char *p;
1927
1928 p = strjoin(runtime_prefix, "/", *i, NULL);
1929 if (!p)
1930 return -ENOMEM;
1931
1932 /* We execute this synchronously, since we need to be
1933 * sure this is gone when we start the service
1934 * next. */
1935 rm_rf_dangerous(p, false, true, false);
1936 }
1937
1938 return 0;
5cb5a6ff
LP		 1939}
1940
43d0fcbd
LP		 1941void exec_command_done(ExecCommand *c) {
1942 assert(c);
1943
1944 free(c->path);
1945 c->path = NULL;
1946
1947 strv_free(c->argv);
1948 c->argv = NULL;
1949}
1950
1951void exec_command_done_array(ExecCommand *c, unsigned n) {
1952 unsigned i;
1953
1954 for (i = 0; i < n; i++)
1955 exec_command_done(c+i);
1956}
1957
5cb5a6ff
LP		 1958void exec_command_free_list(ExecCommand *c) {
1959 ExecCommand *i;
1960
1961 while ((i = c)) {
71fda00f 1962 LIST_REMOVE(command, c, i);
43d0fcbd 1963 exec_command_done(i);
5cb5a6ff
LP		 1964 free(i);
1965 }
1966}
1967
034c6ed7
LP		 1968void exec_command_free_array(ExecCommand **c, unsigned n) {
1969 unsigned i;
1970
1971 for (i = 0; i < n; i++) {
1972 exec_command_free_list(c[i]);
1973 c[i] = NULL;
1974 }
1975}
1976
8c7be95e
LP		 1977int exec_context_load_environment(const ExecContext *c, char ***l) {
1978 char **i, **r = NULL;
1979
1980 assert(c);
1981 assert(l);
1982
1983 STRV_FOREACH(i, c->environment_files) {
1984 char *fn;
1985 int k;
1986 bool ignore = false;
1987 char **p;
7fd1b19b 1988 _cleanup_globfree_ glob_t pglob = {};
2bef10ab 1989 int count, n;
8c7be95e
LP		 1990
1991 fn = *i;
1992
1993 if (fn[0] == '-') {
1994 ignore = true;
1995 fn ++;
1996 }
1997
1998 if (!path_is_absolute(fn)) {
8c7be95e
LP		 1999 if (ignore)
2000 continue;
2001
2002 strv_free(r);
2003 return -EINVAL;
2004 }
2005
2bef10ab 2006 /* Filename supports globbing, take all matching files */
2bef10ab
PL		 2007 errno = 0;
2008 if (glob(fn, 0, NULL, &pglob) != 0) {
2bef10ab
PL		 2009 if (ignore)
2010 continue;
8c7be95e 2011
2bef10ab
PL		 2012 strv_free(r);
2013 return errno ? -errno : -EINVAL;
2014 }
2015 count = pglob.gl_pathc;
2016 if (count == 0) {
8c7be95e
LP		 2017 if (ignore)
2018 continue;
2019
2020 strv_free(r);
2bef10ab 2021 return -EINVAL;
8c7be95e 2022 }
2bef10ab 2023 for (n = 0; n < count; n++) {
f73141d7 2024 k = load_env_file(pglob.gl_pathv[n], NULL, &p);
2bef10ab
PL		 2025 if (k < 0) {
2026 if (ignore)
2027 continue;
8c7be95e 2028
2bef10ab 2029 strv_free(r);
2bef10ab 2030 return k;
e9c1ea9d 2031 }
ebc05a09 2032 /* Log invalid environment variables with filename */
e9c1ea9d
JSJ		 2033 if (p)
2034 p = strv_env_clean_log(p, pglob.gl_pathv[n]);
8c7be95e 2035
2bef10ab
PL		 2036 if (r == NULL)
2037 r = p;
2038 else {
2039 char **m;
8c7be95e 2040
2bef10ab
PL		 2041 m = strv_env_merge(2, r, p);
2042 strv_free(r);
2043 strv_free(p);
c84a9488 2044 if (!m)
2bef10ab 2045 return -ENOMEM;
2bef10ab
PL		 2046
2047 r = m;
2048 }
8c7be95e
LP		 2049 }
2050 }
2051
2052 *l = r;
2053
2054 return 0;
2055}
2056
6ac8fdc9
MS		 2057static bool tty_may_match_dev_console(const char *tty) {
2058 char *active = NULL, *console;
2059 bool b;
2060
2061 if (startswith(tty, "/dev/"))
2062 tty += 5;
2063
2064 /* trivial identity? */
2065 if (streq(tty, "console"))
2066 return true;
2067
2068 console = resolve_dev_console(&active);
2069 /* if we could not resolve, assume it may */
2070 if (!console)
2071 return true;
2072
2073 /* "tty0" means the active VC, so it may be the same sometimes */
2074 b = streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty));
2075 free(active);
2076
2077 return b;
2078}
2079
2080bool exec_context_may_touch_console(ExecContext *ec) {
2081 return (ec->tty_reset || ec->tty_vhangup || ec->tty_vt_disallocate ||
2082 is_terminal_input(ec->std_input) ||
2083 is_terminal_output(ec->std_output) ||
2084 is_terminal_output(ec->std_error)) &&
2085 tty_may_match_dev_console(tty_path(ec));
2086}
2087
15ae422b
LP		 2088static void strv_fprintf(FILE *f, char **l) {
2089 char **g;
2090
2091 assert(f);
2092
2093 STRV_FOREACH(g, l)
2094 fprintf(f, " %s", *g);
2095}
2096
5cb5a6ff 2097void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
507f22bd 2098 char **e;
94f04347 2099 unsigned i;
9eba9da4 2100
5cb5a6ff
LP		 2101 assert(c);
2102 assert(f);
2103
4ad49000 2104 prefix = strempty(prefix);
5cb5a6ff
LP		 2105
2106 fprintf(f,
94f04347
LP		 2107 "%sUMask: %04o\n"
2108 "%sWorkingDirectory: %s\n"
451a074f 2109 "%sRootDirectory: %s\n"
15ae422b 2110 "%sNonBlocking: %s\n"
64747e2d 2111 "%sPrivateTmp: %s\n"
4819ff03 2112 "%sPrivateNetwork: %s\n"
7f112f50 2113 "%sPrivateDevices: %s\n"
4819ff03 2114 "%sIgnoreSIGPIPE: %s\n",
5cb5a6ff 2115 prefix, c->umask,
9eba9da4 2116 prefix, c->working_directory ? c->working_directory : "/",
451a074f 2117 prefix, c->root_directory ? c->root_directory : "/",
15ae422b 2118 prefix, yes_no(c->non_blocking),
64747e2d 2119 prefix, yes_no(c->private_tmp),
4819ff03 2120 prefix, yes_no(c->private_network),
7f112f50 2121 prefix, yes_no(c->private_devices),
4819ff03 2122 prefix, yes_no(c->ignore_sigpipe));
fb33a393 2123
8c7be95e
LP		 2124 STRV_FOREACH(e, c->environment)
2125 fprintf(f, "%sEnvironment: %s\n", prefix, *e);
2126
2127 STRV_FOREACH(e, c->environment_files)
2128 fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e);
94f04347 2129
fb33a393
LP		 2130 if (c->nice_set)
2131 fprintf(f,
2132 "%sNice: %i\n",
2133 prefix, c->nice);
2134
dd6c17b1 2135 if (c->oom_score_adjust_set)
fb33a393 2136 fprintf(f,
dd6c17b1
LP		 2137 "%sOOMScoreAdjust: %i\n",
2138 prefix, c->oom_score_adjust);
9eba9da4 2139
94f04347
LP		 2140 for (i = 0; i < RLIM_NLIMITS; i++)
2141 if (c->rlimit[i])
ea430986 2142 fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
94f04347 2143
f8b69d1d 2144 if (c->ioprio_set) {
1756a011 2145 _cleanup_free_ char *class_str = NULL;
f8b69d1d 2146
1756a011 2147 ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str);
9eba9da4
LP		 2148 fprintf(f,
2149 "%sIOSchedulingClass: %s\n"
2150 "%sIOPriority: %i\n",
f8b69d1d 2151 prefix, strna(class_str),
9eba9da4 2152 prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
f8b69d1d 2153 }
94f04347 2154
f8b69d1d 2155 if (c->cpu_sched_set) {
1756a011 2156 _cleanup_free_ char *policy_str = NULL;
f8b69d1d 2157
1756a011 2158 sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str);
94f04347
LP		 2159 fprintf(f,
2160 "%sCPUSchedulingPolicy: %s\n"
38b48754
LP		 2161 "%sCPUSchedulingPriority: %i\n"
2162 "%sCPUSchedulingResetOnFork: %s\n",
f8b69d1d 2163 prefix, strna(policy_str),
38b48754
LP		 2164 prefix, c->cpu_sched_priority,
2165 prefix, yes_no(c->cpu_sched_reset_on_fork));
b929bf04 2166 }
94f04347 2167
82c121a4 2168 if (c->cpuset) {
94f04347 2169 fprintf(f, "%sCPUAffinity:", prefix);
82c121a4
LP		 2170 for (i = 0; i < c->cpuset_ncpus; i++)
2171 if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset))
43a99a7a 2172 fprintf(f, " %u", i);
94f04347
LP		 2173 fputs("\n", f);
2174 }
2175
d88a251b 2176 if (c->timer_slack_nsec != (nsec_t) -1)
ccd06097 2177 fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec);
94f04347
LP		 2178
2179 fprintf(f,
80876c20
LP		 2180 "%sStandardInput: %s\n"
2181 "%sStandardOutput: %s\n"
2182 "%sStandardError: %s\n",
2183 prefix, exec_input_to_string(c->std_input),
2184 prefix, exec_output_to_string(c->std_output),
2185 prefix, exec_output_to_string(c->std_error));
2186
2187 if (c->tty_path)
2188 fprintf(f,
6ea832a2
LP		 2189 "%sTTYPath: %s\n"
2190 "%sTTYReset: %s\n"
2191 "%sTTYVHangup: %s\n"
2192 "%sTTYVTDisallocate: %s\n",
2193 prefix, c->tty_path,
2194 prefix, yes_no(c->tty_reset),
2195 prefix, yes_no(c->tty_vhangup),
2196 prefix, yes_no(c->tty_vt_disallocate));
94f04347 2197
5ce70e5b
ZJS		 2198 if (c->std_output == EXEC_OUTPUT_SYSLOG ||
2199 c->std_output == EXEC_OUTPUT_KMSG ||
2200 c->std_output == EXEC_OUTPUT_JOURNAL ||
2201 c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
2202 c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
2203 c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE ||
2204 c->std_error == EXEC_OUTPUT_SYSLOG ||
2205 c->std_error == EXEC_OUTPUT_KMSG ||
2206 c->std_error == EXEC_OUTPUT_JOURNAL ||
2207 c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE ||
2208 c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE ||
2209 c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) {
f8b69d1d 2210
5ce70e5b 2211 _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL;
f8b69d1d 2212
5ce70e5b
ZJS		 2213 log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str);
2214 log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str);
f8b69d1d 2215
94f04347
LP		 2216 fprintf(f,
2217 "%sSyslogFacility: %s\n"
2218 "%sSyslogLevel: %s\n",
f8b69d1d
MS		 2219 prefix, strna(fac_str),
2220 prefix, strna(lvl_str));
f8b69d1d 2221 }
94f04347
LP		 2222
2223 if (c->capabilities) {
5ce70e5b
ZJS		 2224 _cleanup_cap_free_charp_ char *t;
2225
2226 t = cap_to_text(c->capabilities, NULL);
2227 if (t)
2228 fprintf(f, "%sCapabilities: %s\n", prefix, t);
94f04347
LP		 2229 }
2230
2231 if (c->secure_bits)
2232 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
2233 prefix,
cbb21cca
ZJS		 2234 (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "",
2235 (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
2236 (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
2237 (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
2238 (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "",
2239 (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
94f04347
LP		 2240
2241 if (c->capability_bounding_set_drop) {
ae556c21 2242 unsigned long l;
260abb78 2243 fprintf(f, "%sCapabilityBoundingSet:", prefix);
94f04347 2244
64685e0c 2245 for (l = 0; l <= cap_last_cap(); l++)
ae556c21 2246 if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) {
5ce70e5b 2247 _cleanup_cap_free_charp_ char *t;
94f04347 2248
5ce70e5b
ZJS		 2249 t = cap_to_name(l);
2250 if (t)
94f04347 2251 fprintf(f, " %s", t);
94f04347
LP		 2252 }
2253
2254 fputs("\n", f);
2255 }
2256
2257 if (c->user)
f2d3769a 2258 fprintf(f, "%sUser: %s\n", prefix, c->user);
94f04347 2259 if (c->group)
f2d3769a 2260 fprintf(f, "%sGroup: %s\n", prefix, c->group);
94f04347 2261
15ae422b 2262 if (strv_length(c->supplementary_groups) > 0) {
94f04347 2263 fprintf(f, "%sSupplementaryGroups:", prefix);
15ae422b
LP		 2264 strv_fprintf(f, c->supplementary_groups);
2265 fputs("\n", f);
2266 }
94f04347 2267
5b6319dc 2268 if (c->pam_name)
f2d3769a 2269 fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name);
5b6319dc 2270
15ae422b
LP		 2271 if (strv_length(c->read_write_dirs) > 0) {
2272 fprintf(f, "%sReadWriteDirs:", prefix);
2273 strv_fprintf(f, c->read_write_dirs);
2274 fputs("\n", f);
2275 }
2276
2277 if (strv_length(c->read_only_dirs) > 0) {
2278 fprintf(f, "%sReadOnlyDirs:", prefix);
2279 strv_fprintf(f, c->read_only_dirs);
2280 fputs("\n", f);
2281 }
94f04347 2282
15ae422b
LP		 2283 if (strv_length(c->inaccessible_dirs) > 0) {
2284 fprintf(f, "%sInaccessibleDirs:", prefix);
2285 strv_fprintf(f, c->inaccessible_dirs);
94f04347
LP		 2286 fputs("\n", f);
2287 }
2e22afe9 2288
169c1bda
LP		 2289 if (c->utmp_id)
2290 fprintf(f,
2291 "%sUtmpIdentifier: %s\n",
2292 prefix, c->utmp_id);
7b52a628
MS		 2293
2294 if (c->selinux_context)
2295 fprintf(f,
5f8640fb
LP		 2296 "%sSELinuxContext: %s%s\n",
2297 prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context);
17df7223 2298
ac45f971
LP		 2299 if (c->personality != 0xffffffffUL)
2300 fprintf(f,
2301 "%sPersonality: %s\n",
2302 prefix, strna(personality_to_string(c->personality)));
2303
17df7223 2304 if (c->syscall_filter) {
351a19b1 2305#ifdef HAVE_SECCOMP
17df7223
LP		 2306 Iterator j;
2307 void *id;
2308 bool first = true;
351a19b1 2309#endif
17df7223
LP		 2310
2311 fprintf(f,
57183d11 2312 "%sSystemCallFilter: ",
17df7223
LP		 2313 prefix);
2314
2315 if (!c->syscall_whitelist)
2316 fputc('~', f);
2317
351a19b1 2318#ifdef HAVE_SECCOMP
17df7223
LP		 2319 SET_FOREACH(id, c->syscall_filter, j) {
2320 _cleanup_free_ char *name = NULL;
2321
2322 if (first)
2323 first = false;
2324 else
2325 fputc(' ', f);
2326
57183d11 2327 name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1);
17df7223
LP		 2328 fputs(strna(name), f);
2329 }
351a19b1 2330#endif
17df7223
LP		 2331
2332 fputc('\n', f);
2333 }
2334
57183d11
LP		 2335 if (c->syscall_archs) {
2336#ifdef HAVE_SECCOMP
2337 Iterator j;
2338 void *id;
2339#endif
2340
2341 fprintf(f,
2342 "%sSystemCallArchitectures:",
2343 prefix);
2344
2345#ifdef HAVE_SECCOMP
2346 SET_FOREACH(id, c->syscall_archs, j)
2347 fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1)));
2348#endif
2349 fputc('\n', f);
2350 }
2351
17df7223
LP		 2352 if (c->syscall_errno != 0)
2353 fprintf(f,
2354 "%sSystemCallErrorNumber: %s\n",
2355 prefix, strna(errno_to_name(c->syscall_errno)));
eef65bf3
MS		 2356
2357 if (c->apparmor_profile)
2358 fprintf(f,
2359 "%sAppArmorProfile: %s%s\n",
2360 prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile);
5cb5a6ff
LP		 2361}
2362
b58b4116 2363void exec_status_start(ExecStatus *s, pid_t pid) {
034c6ed7 2364 assert(s);
5cb5a6ff 2365
b58b4116
LP		 2366 zero(*s);
2367 s->pid = pid;
2368 dual_timestamp_get(&s->start_timestamp);
2369}
2370
6ea832a2 2371void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) {
b58b4116
LP		 2372 assert(s);
2373
0b1f4ae6 2374 if (s->pid && s->pid != pid)
b58b4116
LP		 2375 zero(*s);
2376
034c6ed7 2377 s->pid = pid;
63983207 2378 dual_timestamp_get(&s->exit_timestamp);
9fb86720 2379
034c6ed7
LP		 2380 s->code = code;
2381 s->status = status;
169c1bda 2382
6ea832a2
LP		 2383 if (context) {
2384 if (context->utmp_id)
2385 utmp_put_dead_process(context->utmp_id, pid, code, status);
2386
2387 exec_context_tty_reset(context);
2388 }
9fb86720
LP		 2389}
2390
2391void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) {
2392 char buf[FORMAT_TIMESTAMP_MAX];
2393
2394 assert(s);
2395 assert(f);
2396
2397 if (!prefix)
2398 prefix = "";
2399
2400 if (s->pid <= 0)
2401 return;
2402
2403 fprintf(f,
ccd06097
ZJS		 2404 "%sPID: "PID_FMT"\n",
2405 prefix, s->pid);
9fb86720 2406
63983207 2407 if (s->start_timestamp.realtime > 0)
9fb86720
LP		 2408 fprintf(f,
2409 "%sStart Timestamp: %s\n",
63983207 2410 prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime));
9fb86720 2411
63983207 2412 if (s->exit_timestamp.realtime > 0)
9fb86720
LP		 2413 fprintf(f,
2414 "%sExit Timestamp: %s\n"
2415 "%sExit Code: %s\n"
2416 "%sExit Status: %i\n",
63983207 2417 prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime),
9fb86720
LP		 2418 prefix, sigchld_code_to_string(s->code),
2419 prefix, s->status);
5cb5a6ff 2420}
44d8db9e 2421
9e2f7c11 2422char *exec_command_line(char **argv) {
44d8db9e
LP		 2423 size_t k;
2424 char *n, *p, **a;
2425 bool first = true;
2426
9e2f7c11 2427 assert(argv);
44d8db9e 2428
9164977d 2429 k = 1;
9e2f7c11 2430 STRV_FOREACH(a, argv)
44d8db9e
LP		 2431 k += strlen(*a)+3;
2432
2433 if (!(n = new(char, k)))
2434 return NULL;
2435
2436 p = n;
9e2f7c11 2437 STRV_FOREACH(a, argv) {
44d8db9e
LP		 2438
2439 if (!first)
2440 *(p++) = ' ';
2441 else
2442 first = false;
2443
2444 if (strpbrk(*a, WHITESPACE)) {
2445 *(p++) = '\'';
2446 p = stpcpy(p, *a);
2447 *(p++) = '\'';
2448 } else
2449 p = stpcpy(p, *a);
2450
2451 }
2452
9164977d
LP		 2453 *p = 0;
2454
44d8db9e
LP		 2455 /* FIXME: this doesn't really handle arguments that have
2456 * spaces and ticks in them */
2457
2458 return n;
2459}
2460
2461void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
9fb86720
LP		 2462 char *p2;
2463 const char *prefix2;
2464
44d8db9e
LP		 2465 char *cmd;
2466
2467 assert(c);
2468 assert(f);
2469
2470 if (!prefix)
2471 prefix = "";
9fb86720
LP		 2472 p2 = strappend(prefix, "\t");
2473 prefix2 = p2 ? p2 : prefix;
44d8db9e 2474
9e2f7c11 2475 cmd = exec_command_line(c->argv);
44d8db9e
LP		 2476
2477 fprintf(f,
2478 "%sCommand Line: %s\n",
2479 prefix, cmd ? cmd : strerror(ENOMEM));
2480
2481 free(cmd);
9fb86720
LP		 2482
2483 exec_status_dump(&c->exec_status, f, prefix2);
2484
2485 free(p2);
44d8db9e
LP		 2486}
2487
2488void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
2489 assert(f);
2490
2491 if (!prefix)
2492 prefix = "";
2493
2494 LIST_FOREACH(command, c, c)
2495 exec_command_dump(c, f, prefix);
2496}
94f04347 2497
a6a80b4f
LP		 2498void exec_command_append_list(ExecCommand **l, ExecCommand *e) {
2499 ExecCommand *end;
2500
2501 assert(l);
2502 assert(e);
2503
2504 if (*l) {
35b8ca3a 2505 /* It's kind of important, that we keep the order here */
71fda00f
LP		 2506 LIST_FIND_TAIL(command, *l, end);
2507 LIST_INSERT_AFTER(command, *l, end, e);
a6a80b4f
LP		 2508 } else
2509 *l = e;
2510}
2511
26fd040d
LP		 2512int exec_command_set(ExecCommand *c, const char *path, ...) {
2513 va_list ap;
2514 char **l, *p;
2515
2516 assert(c);
2517 assert(path);
2518
2519 va_start(ap, path);
2520 l = strv_new_ap(path, ap);
2521 va_end(ap);
2522
2523 if (!l)
2524 return -ENOMEM;
2525
250a918d
LP		 2526 p = strdup(path);
2527 if (!p) {
26fd040d
LP		 2528 strv_free(l);
2529 return -ENOMEM;
2530 }
2531
2532 free(c->path);
2533 c->path = p;
2534
2535 strv_free(c->argv);
2536 c->argv = l;
2537
2538 return 0;
2539}
2540
613b411c
LP		 2541static int exec_runtime_allocate(ExecRuntime **rt) {
2542
2543 if (*rt)
2544 return 0;
2545
2546 *rt = new0(ExecRuntime, 1);
f146f5e1 2547 if (!*rt)
613b411c
LP		 2548 return -ENOMEM;
2549
2550 (*rt)->n_ref = 1;
2551 (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1;
2552
2553 return 0;
2554}
2555
2556int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) {
2557 int r;
2558
2559 assert(rt);
2560 assert(c);
2561 assert(id);
2562
2563 if (*rt)
2564 return 1;
2565
2566 if (!c->private_network && !c->private_tmp)
2567 return 0;
2568
2569 r = exec_runtime_allocate(rt);
2570 if (r < 0)
2571 return r;
2572
2573 if (c->private_network && (*rt)->netns_storage_socket[0] < 0) {
2574 if (socketpair(AF_UNIX, SOCK_DGRAM, 0, (*rt)->netns_storage_socket) < 0)
2575 return -errno;
2576 }
2577
2578 if (c->private_tmp && !(*rt)->tmp_dir) {
2579 r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir);
2580 if (r < 0)
2581 return r;
2582 }
2583
2584 return 1;
2585}
2586
2587ExecRuntime *exec_runtime_ref(ExecRuntime *r) {
2588 assert(r);
2589 assert(r->n_ref > 0);
2590
2591 r->n_ref++;
2592 return r;
2593}
2594
2595ExecRuntime *exec_runtime_unref(ExecRuntime *r) {
2596
2597 if (!r)
2598 return NULL;
2599
2600 assert(r->n_ref > 0);
2601
2602 r->n_ref--;
2603 if (r->n_ref <= 0) {
2604 free(r->tmp_dir);
2605 free(r->var_tmp_dir);
3d94f76c 2606 safe_close_pair(r->netns_storage_socket);
613b411c
LP		 2607 free(r);
2608 }
2609
2610 return NULL;
2611}
2612
2613int exec_runtime_serialize(ExecRuntime *rt, Unit *u, FILE *f, FDSet *fds) {
2614 assert(u);
2615 assert(f);
2616 assert(fds);
2617
2618 if (!rt)
2619 return 0;
2620
2621 if (rt->tmp_dir)
2622 unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir);
2623
2624 if (rt->var_tmp_dir)
2625 unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir);
2626
2627 if (rt->netns_storage_socket[0] >= 0) {
2628 int copy;
2629
2630 copy = fdset_put_dup(fds, rt->netns_storage_socket[0]);
2631 if (copy < 0)
2632 return copy;
2633
2634 unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy);
2635 }
2636
2637 if (rt->netns_storage_socket[1] >= 0) {
2638 int copy;
2639
2640 copy = fdset_put_dup(fds, rt->netns_storage_socket[1]);
2641 if (copy < 0)
2642 return copy;
2643
2644 unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy);
2645 }
2646
2647 return 0;
2648}
2649
2650int exec_runtime_deserialize_item(ExecRuntime **rt, Unit *u, const char *key, const char *value, FDSet *fds) {
2651 int r;
2652
2653 assert(rt);
2654 assert(key);
2655 assert(value);
2656
2657 if (streq(key, "tmp-dir")) {
2658 char *copy;
2659
2660 r = exec_runtime_allocate(rt);
2661 if (r < 0)
2662 return r;
2663
2664 copy = strdup(value);
2665 if (!copy)
2666 return log_oom();
2667
2668 free((*rt)->tmp_dir);
2669 (*rt)->tmp_dir = copy;
2670
2671 } else if (streq(key, "var-tmp-dir")) {
2672 char *copy;
2673
2674 r = exec_runtime_allocate(rt);
2675 if (r < 0)
2676 return r;
2677
2678 copy = strdup(value);
2679 if (!copy)
2680 return log_oom();
2681
2682 free((*rt)->var_tmp_dir);
2683 (*rt)->var_tmp_dir = copy;
2684
2685 } else if (streq(key, "netns-socket-0")) {
2686 int fd;
2687
2688 r = exec_runtime_allocate(rt);
2689 if (r < 0)
2690 return r;
2691
2692 if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
2693 log_debug_unit(u->id, "Failed to parse netns socket value %s", value);
2694 else {
03e334a1 2695 safe_close((*rt)->netns_storage_socket[0]);
613b411c
LP		 2696 (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd);
2697 }
2698 } else if (streq(key, "netns-socket-1")) {
2699 int fd;
2700
2701 r = exec_runtime_allocate(rt);
2702 if (r < 0)
2703 return r;
2704
2705 if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
2706 log_debug_unit(u->id, "Failed to parse netns socket value %s", value);
2707 else {
03e334a1 2708 safe_close((*rt)->netns_storage_socket[1]);
613b411c
LP		 2709 (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd);
2710 }
2711 } else
2712 return 0;
2713
2714 return 1;
2715}
2716
2717static void *remove_tmpdir_thread(void *p) {
2718 _cleanup_free_ char *path = p;
2719
2720 rm_rf_dangerous(path, false, true, false);
2721 return NULL;
2722}
2723
2724void exec_runtime_destroy(ExecRuntime *rt) {
98b47d54
LP		 2725 int r;
2726
613b411c
LP		 2727 if (!rt)
2728 return;
2729
2730 /* If there are multiple users of this, let's leave the stuff around */
2731 if (rt->n_ref > 1)
2732 return;
2733
2734 if (rt->tmp_dir) {
2735 log_debug("Spawning thread to nuke %s", rt->tmp_dir);
98b47d54
LP		 2736
2737 r = asynchronous_job(remove_tmpdir_thread, rt->tmp_dir);
2738 if (r < 0) {
2739 log_warning("Failed to nuke %s: %s", rt->tmp_dir, strerror(-r));
2740 free(rt->tmp_dir);
2741 }
2742
613b411c
LP		 2743 rt->tmp_dir = NULL;
2744 }
2745
2746 if (rt->var_tmp_dir) {
2747 log_debug("Spawning thread to nuke %s", rt->var_tmp_dir);
98b47d54
LP		 2748
2749 r = asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir);
2750 if (r < 0) {
2751 log_warning("Failed to nuke %s: %s", rt->var_tmp_dir, strerror(-r));
2752 free(rt->var_tmp_dir);
2753 }
2754
613b411c
LP		 2755 rt->var_tmp_dir = NULL;
2756 }
2757
3d94f76c 2758 safe_close_pair(rt->netns_storage_socket);
613b411c
LP		 2759}
2760
80876c20
LP		 2761static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
2762 [EXEC_INPUT_NULL] = "null",
2763 [EXEC_INPUT_TTY] = "tty",
2764 [EXEC_INPUT_TTY_FORCE] = "tty-force",
4f2d528d
LP		 2765 [EXEC_INPUT_TTY_FAIL] = "tty-fail",
2766 [EXEC_INPUT_SOCKET] = "socket"
80876c20
LP		 2767};
2768
8a0867d6
LP		 2769DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);
2770
94f04347 2771static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
80876c20 2772 [EXEC_OUTPUT_INHERIT] = "inherit",
94f04347 2773 [EXEC_OUTPUT_NULL] = "null",
80876c20 2774 [EXEC_OUTPUT_TTY] = "tty",
94f04347 2775 [EXEC_OUTPUT_SYSLOG] = "syslog",
28dbc1e8 2776 [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console",
9a6bca7a 2777 [EXEC_OUTPUT_KMSG] = "kmsg",
28dbc1e8 2778 [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console",
706343f4
LP		 2779 [EXEC_OUTPUT_JOURNAL] = "journal",
2780 [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console",
4f2d528d 2781 [EXEC_OUTPUT_SOCKET] = "socket"
94f04347
LP		 2782};
2783
2784DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
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