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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
5cb5a6ff | 2 | |
a7334b09 LP |
3 | /*** |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
a7334b09 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
a7334b09 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
a7334b09 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
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> |
023a4f67 | 34 | #include <utmpx.h> |
ac45f971 | 35 | #include <sys/personality.h> |
5cb5a6ff | 36 | |
5b6319dc LP |
37 | #ifdef HAVE_PAM |
38 | #include <security/pam_appl.h> | |
39 | #endif | |
40 | ||
7b52a628 MS |
41 | #ifdef HAVE_SELINUX |
42 | #include <selinux/selinux.h> | |
43 | #endif | |
44 | ||
17df7223 LP |
45 | #ifdef HAVE_SECCOMP |
46 | #include <seccomp.h> | |
47 | #endif | |
48 | ||
eef65bf3 MS |
49 | #ifdef HAVE_APPARMOR |
50 | #include <sys/apparmor.h> | |
51 | #endif | |
52 | ||
2d7c6aa2 | 53 | #include "barrier.h" |
24882e06 | 54 | #include "sd-messages.h" |
c6878637 | 55 | #include "rm-rf.h" |
5cb5a6ff LP |
56 | #include "strv.h" |
57 | #include "macro.h" | |
d7832d2c | 58 | #include "capability.h" |
5cb5a6ff | 59 | #include "util.h" |
acbb0225 | 60 | #include "log.h" |
9eba9da4 | 61 | #include "ioprio.h" |
94f04347 | 62 | #include "securebits.h" |
15ae422b | 63 | #include "namespace.h" |
d06dacd0 | 64 | #include "exit-status.h" |
dd6c17b1 | 65 | #include "missing.h" |
169c1bda | 66 | #include "utmp-wtmp.h" |
f6a6225e | 67 | #include "def.h" |
9eb977db | 68 | #include "path-util.h" |
4d1a6904 | 69 | #include "env-util.h" |
a5c32cff | 70 | #include "fileio.h" |
4ad49000 | 71 | #include "unit.h" |
f485606b | 72 | #include "async.h" |
0d3f7bb3 | 73 | #include "selinux-util.h" |
17df7223 | 74 | #include "errno-list.h" |
4298d0b5 | 75 | #include "af-list.h" |
e66cf1a3 | 76 | #include "mkdir.h" |
2ca620c4 | 77 | #include "smack-util.h" |
3c70e3bb | 78 | #include "bus-endpoint.h" |
2822da4f | 79 | #include "cap-list.h" |
6482f626 | 80 | #include "formats-util.h" |
0b452006 | 81 | #include "process-util.h" |
288a74cc | 82 | #include "terminal-util.h" |
24882e06 | 83 | #include "signal-util.h" |
5cb5a6ff | 84 | |
2eec67ac TA |
85 | #ifdef HAVE_APPARMOR |
86 | #include "apparmor-util.h" | |
87 | #endif | |
88 | ||
57183d11 LP |
89 | #ifdef HAVE_SECCOMP |
90 | #include "seccomp-util.h" | |
91 | #endif | |
92 | ||
24882e06 LP |
93 | #include "execute.h" |
94 | ||
e056b01d | 95 | #define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC) |
31a7eb86 | 96 | #define IDLE_TIMEOUT2_USEC (1*USEC_PER_SEC) |
e6a26745 | 97 | |
02a51aba LP |
98 | /* This assumes there is a 'tty' group */ |
99 | #define TTY_MODE 0620 | |
100 | ||
531dca78 LP |
101 | #define SNDBUF_SIZE (8*1024*1024) |
102 | ||
034c6ed7 LP |
103 | static int shift_fds(int fds[], unsigned n_fds) { |
104 | int start, restart_from; | |
105 | ||
106 | if (n_fds <= 0) | |
107 | return 0; | |
108 | ||
a0d40ac5 LP |
109 | /* Modifies the fds array! (sorts it) */ |
110 | ||
034c6ed7 LP |
111 | assert(fds); |
112 | ||
113 | start = 0; | |
114 | for (;;) { | |
115 | int i; | |
116 | ||
117 | restart_from = -1; | |
118 | ||
119 | for (i = start; i < (int) n_fds; i++) { | |
120 | int nfd; | |
121 | ||
122 | /* Already at right index? */ | |
123 | if (fds[i] == i+3) | |
124 | continue; | |
125 | ||
3cc2aff1 LP |
126 | nfd = fcntl(fds[i], F_DUPFD, i + 3); |
127 | if (nfd < 0) | |
034c6ed7 LP |
128 | return -errno; |
129 | ||
03e334a1 | 130 | safe_close(fds[i]); |
034c6ed7 LP |
131 | fds[i] = nfd; |
132 | ||
133 | /* Hmm, the fd we wanted isn't free? Then | |
ee33e53a | 134 | * let's remember that and try again from here */ |
034c6ed7 LP |
135 | if (nfd != i+3 && restart_from < 0) |
136 | restart_from = i; | |
137 | } | |
138 | ||
139 | if (restart_from < 0) | |
140 | break; | |
141 | ||
142 | start = restart_from; | |
143 | } | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
c2748801 | 148 | static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) { |
47a71eed | 149 | unsigned i; |
e2c76839 | 150 | int r; |
47a71eed LP |
151 | |
152 | if (n_fds <= 0) | |
153 | return 0; | |
154 | ||
155 | assert(fds); | |
156 | ||
451a074f | 157 | /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */ |
47a71eed LP |
158 | |
159 | for (i = 0; i < n_fds; i++) { | |
47a71eed | 160 | |
3cc2aff1 LP |
161 | r = fd_nonblock(fds[i], nonblock); |
162 | if (r < 0) | |
e2c76839 | 163 | return r; |
47a71eed | 164 | |
451a074f LP |
165 | /* We unconditionally drop FD_CLOEXEC from the fds, |
166 | * since after all we want to pass these fds to our | |
167 | * children */ | |
47a71eed | 168 | |
3cc2aff1 LP |
169 | r = fd_cloexec(fds[i], false); |
170 | if (r < 0) | |
e2c76839 | 171 | return r; |
47a71eed LP |
172 | } |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
44a6b1b6 | 177 | _pure_ static const char *tty_path(const ExecContext *context) { |
80876c20 LP |
178 | assert(context); |
179 | ||
180 | if (context->tty_path) | |
181 | return context->tty_path; | |
182 | ||
183 | return "/dev/console"; | |
184 | } | |
185 | ||
9588bc32 | 186 | static void exec_context_tty_reset(const ExecContext *context) { |
6ea832a2 LP |
187 | assert(context); |
188 | ||
189 | if (context->tty_vhangup) | |
190 | terminal_vhangup(tty_path(context)); | |
191 | ||
192 | if (context->tty_reset) | |
193 | reset_terminal(tty_path(context)); | |
194 | ||
195 | if (context->tty_vt_disallocate && context->tty_path) | |
196 | vt_disallocate(context->tty_path); | |
197 | } | |
198 | ||
3a1286b6 MS |
199 | static bool is_terminal_output(ExecOutput o) { |
200 | return | |
201 | o == EXEC_OUTPUT_TTY || | |
202 | o == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
203 | o == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
204 | o == EXEC_OUTPUT_JOURNAL_AND_CONSOLE; | |
205 | } | |
206 | ||
80876c20 LP |
207 | static int open_null_as(int flags, int nfd) { |
208 | int fd, r; | |
071830ff | 209 | |
80876c20 | 210 | assert(nfd >= 0); |
071830ff | 211 | |
613b411c LP |
212 | fd = open("/dev/null", flags|O_NOCTTY); |
213 | if (fd < 0) | |
071830ff LP |
214 | return -errno; |
215 | ||
80876c20 LP |
216 | if (fd != nfd) { |
217 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 218 | safe_close(fd); |
80876c20 LP |
219 | } else |
220 | r = nfd; | |
071830ff | 221 | |
80876c20 | 222 | return r; |
071830ff LP |
223 | } |
224 | ||
524daa8c | 225 | static int connect_journal_socket(int fd, uid_t uid, gid_t gid) { |
b92bea5d ZJS |
226 | union sockaddr_union sa = { |
227 | .un.sun_family = AF_UNIX, | |
228 | .un.sun_path = "/run/systemd/journal/stdout", | |
229 | }; | |
524daa8c ZJS |
230 | uid_t olduid = UID_INVALID; |
231 | gid_t oldgid = GID_INVALID; | |
232 | int r; | |
233 | ||
234 | if (gid != GID_INVALID) { | |
235 | oldgid = getgid(); | |
236 | ||
237 | r = setegid(gid); | |
238 | if (r < 0) | |
239 | return -errno; | |
240 | } | |
241 | ||
242 | if (uid != UID_INVALID) { | |
243 | olduid = getuid(); | |
244 | ||
245 | r = seteuid(uid); | |
246 | if (r < 0) { | |
247 | r = -errno; | |
248 | goto restore_gid; | |
249 | } | |
250 | } | |
251 | ||
252 | r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)); | |
253 | if (r < 0) | |
254 | r = -errno; | |
255 | ||
256 | /* If we fail to restore the uid or gid, things will likely | |
257 | fail later on. This should only happen if an LSM interferes. */ | |
258 | ||
259 | if (uid != UID_INVALID) | |
260 | (void) seteuid(olduid); | |
261 | ||
262 | restore_gid: | |
263 | if (gid != GID_INVALID) | |
264 | (void) setegid(oldgid); | |
265 | ||
266 | return r; | |
267 | } | |
268 | ||
269 | static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, const char *unit_id, int nfd, uid_t uid, gid_t gid) { | |
270 | int fd, r; | |
071830ff LP |
271 | |
272 | assert(context); | |
80876c20 LP |
273 | assert(output < _EXEC_OUTPUT_MAX); |
274 | assert(ident); | |
275 | assert(nfd >= 0); | |
071830ff | 276 | |
54fe0cdb LP |
277 | fd = socket(AF_UNIX, SOCK_STREAM, 0); |
278 | if (fd < 0) | |
80876c20 | 279 | return -errno; |
071830ff | 280 | |
524daa8c ZJS |
281 | r = connect_journal_socket(fd, uid, gid); |
282 | if (r < 0) | |
283 | return r; | |
071830ff | 284 | |
80876c20 | 285 | if (shutdown(fd, SHUT_RD) < 0) { |
03e334a1 | 286 | safe_close(fd); |
80876c20 LP |
287 | return -errno; |
288 | } | |
071830ff | 289 | |
531dca78 LP |
290 | fd_inc_sndbuf(fd, SNDBUF_SIZE); |
291 | ||
80876c20 | 292 | dprintf(fd, |
62bca2c6 | 293 | "%s\n" |
80876c20 LP |
294 | "%s\n" |
295 | "%i\n" | |
54fe0cdb LP |
296 | "%i\n" |
297 | "%i\n" | |
298 | "%i\n" | |
4f4a1dbf | 299 | "%i\n", |
4f4a1dbf | 300 | context->syslog_identifier ? context->syslog_identifier : ident, |
62bca2c6 | 301 | unit_id, |
54fe0cdb LP |
302 | context->syslog_priority, |
303 | !!context->syslog_level_prefix, | |
304 | output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE, | |
305 | output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE, | |
3a1286b6 | 306 | is_terminal_output(output)); |
80876c20 LP |
307 | |
308 | if (fd != nfd) { | |
309 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 310 | safe_close(fd); |
80876c20 LP |
311 | } else |
312 | r = nfd; | |
071830ff | 313 | |
80876c20 LP |
314 | return r; |
315 | } | |
316 | static int open_terminal_as(const char *path, mode_t mode, int nfd) { | |
317 | int fd, r; | |
071830ff | 318 | |
80876c20 LP |
319 | assert(path); |
320 | assert(nfd >= 0); | |
071830ff | 321 | |
3cc2aff1 LP |
322 | fd = open_terminal(path, mode | O_NOCTTY); |
323 | if (fd < 0) | |
80876c20 | 324 | return fd; |
071830ff | 325 | |
80876c20 LP |
326 | if (fd != nfd) { |
327 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 328 | safe_close(fd); |
80876c20 LP |
329 | } else |
330 | r = nfd; | |
071830ff | 331 | |
80876c20 LP |
332 | return r; |
333 | } | |
071830ff | 334 | |
80876c20 LP |
335 | static bool is_terminal_input(ExecInput i) { |
336 | return | |
337 | i == EXEC_INPUT_TTY || | |
338 | i == EXEC_INPUT_TTY_FORCE || | |
339 | i == EXEC_INPUT_TTY_FAIL; | |
340 | } | |
071830ff | 341 | |
1e3ad081 LP |
342 | static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) { |
343 | ||
344 | if (is_terminal_input(std_input) && !apply_tty_stdin) | |
345 | return EXEC_INPUT_NULL; | |
071830ff | 346 | |
03fd9c49 | 347 | if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0) |
4f2d528d LP |
348 | return EXEC_INPUT_NULL; |
349 | ||
03fd9c49 | 350 | return std_input; |
4f2d528d LP |
351 | } |
352 | ||
03fd9c49 | 353 | static int fixup_output(ExecOutput std_output, int socket_fd) { |
4f2d528d | 354 | |
03fd9c49 | 355 | if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0) |
4f2d528d LP |
356 | return EXEC_OUTPUT_INHERIT; |
357 | ||
03fd9c49 | 358 | return std_output; |
4f2d528d LP |
359 | } |
360 | ||
1e3ad081 | 361 | static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) { |
4f2d528d LP |
362 | ExecInput i; |
363 | ||
364 | assert(context); | |
365 | ||
1e3ad081 | 366 | i = fixup_input(context->std_input, socket_fd, apply_tty_stdin); |
4f2d528d LP |
367 | |
368 | switch (i) { | |
071830ff | 369 | |
80876c20 LP |
370 | case EXEC_INPUT_NULL: |
371 | return open_null_as(O_RDONLY, STDIN_FILENO); | |
372 | ||
373 | case EXEC_INPUT_TTY: | |
374 | case EXEC_INPUT_TTY_FORCE: | |
375 | case EXEC_INPUT_TTY_FAIL: { | |
376 | int fd, r; | |
071830ff | 377 | |
970edce6 ZJS |
378 | fd = acquire_terminal(tty_path(context), |
379 | i == EXEC_INPUT_TTY_FAIL, | |
380 | i == EXEC_INPUT_TTY_FORCE, | |
381 | false, | |
3a43da28 | 382 | USEC_INFINITY); |
970edce6 | 383 | if (fd < 0) |
80876c20 LP |
384 | return fd; |
385 | ||
386 | if (fd != STDIN_FILENO) { | |
387 | r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
03e334a1 | 388 | safe_close(fd); |
80876c20 LP |
389 | } else |
390 | r = STDIN_FILENO; | |
391 | ||
392 | return r; | |
393 | } | |
394 | ||
4f2d528d LP |
395 | case EXEC_INPUT_SOCKET: |
396 | return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
397 | ||
80876c20 LP |
398 | default: |
399 | assert_not_reached("Unknown input type"); | |
400 | } | |
401 | } | |
402 | ||
f2341e0a | 403 | static 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 |
404 | ExecOutput o; |
405 | ExecInput i; | |
47c1d80d | 406 | int r; |
4f2d528d | 407 | |
f2341e0a | 408 | assert(unit); |
80876c20 LP |
409 | assert(context); |
410 | assert(ident); | |
411 | ||
1e3ad081 | 412 | i = fixup_input(context->std_input, socket_fd, apply_tty_stdin); |
03fd9c49 | 413 | o = fixup_output(context->std_output, socket_fd); |
4f2d528d | 414 | |
eb17e935 MS |
415 | if (fileno == STDERR_FILENO) { |
416 | ExecOutput e; | |
417 | e = fixup_output(context->std_error, socket_fd); | |
80876c20 | 418 | |
eb17e935 MS |
419 | /* This expects the input and output are already set up */ |
420 | ||
421 | /* Don't change the stderr file descriptor if we inherit all | |
422 | * the way and are not on a tty */ | |
423 | if (e == EXEC_OUTPUT_INHERIT && | |
424 | o == EXEC_OUTPUT_INHERIT && | |
425 | i == EXEC_INPUT_NULL && | |
426 | !is_terminal_input(context->std_input) && | |
427 | getppid () != 1) | |
428 | return fileno; | |
429 | ||
430 | /* Duplicate from stdout if possible */ | |
431 | if (e == o || e == EXEC_OUTPUT_INHERIT) | |
432 | return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno; | |
071830ff | 433 | |
eb17e935 | 434 | o = e; |
80876c20 | 435 | |
eb17e935 | 436 | } else if (o == EXEC_OUTPUT_INHERIT) { |
21d21ea4 LP |
437 | /* If input got downgraded, inherit the original value */ |
438 | if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input)) | |
eb17e935 | 439 | return open_terminal_as(tty_path(context), O_WRONLY, fileno); |
21d21ea4 | 440 | |
acb591e4 | 441 | /* If the input is connected to anything that's not a /dev/null, inherit that... */ |
ff876e28 | 442 | if (i != EXEC_INPUT_NULL) |
eb17e935 | 443 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; |
071830ff | 444 | |
acb591e4 LP |
445 | /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */ |
446 | if (getppid() != 1) | |
eb17e935 | 447 | return fileno; |
94f04347 | 448 | |
eb17e935 MS |
449 | /* We need to open /dev/null here anew, to get the right access mode. */ |
450 | return open_null_as(O_WRONLY, fileno); | |
071830ff | 451 | } |
94f04347 | 452 | |
eb17e935 | 453 | switch (o) { |
80876c20 LP |
454 | |
455 | case EXEC_OUTPUT_NULL: | |
eb17e935 | 456 | return open_null_as(O_WRONLY, fileno); |
80876c20 LP |
457 | |
458 | case EXEC_OUTPUT_TTY: | |
4f2d528d | 459 | if (is_terminal_input(i)) |
eb17e935 | 460 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; |
80876c20 LP |
461 | |
462 | /* We don't reset the terminal if this is just about output */ | |
eb17e935 | 463 | return open_terminal_as(tty_path(context), O_WRONLY, fileno); |
80876c20 LP |
464 | |
465 | case EXEC_OUTPUT_SYSLOG: | |
28dbc1e8 | 466 | case EXEC_OUTPUT_SYSLOG_AND_CONSOLE: |
9a6bca7a | 467 | case EXEC_OUTPUT_KMSG: |
28dbc1e8 | 468 | case EXEC_OUTPUT_KMSG_AND_CONSOLE: |
706343f4 LP |
469 | case EXEC_OUTPUT_JOURNAL: |
470 | case EXEC_OUTPUT_JOURNAL_AND_CONSOLE: | |
f2341e0a | 471 | r = connect_logger_as(context, o, ident, unit->id, fileno, uid, gid); |
47c1d80d | 472 | if (r < 0) { |
f2341e0a | 473 | log_unit_error_errno(unit, r, "Failed to connect %s to the journal socket, ignoring: %m", fileno == STDOUT_FILENO ? "stdout" : "stderr"); |
eb17e935 | 474 | r = open_null_as(O_WRONLY, fileno); |
47c1d80d MS |
475 | } |
476 | return r; | |
4f2d528d LP |
477 | |
478 | case EXEC_OUTPUT_SOCKET: | |
479 | assert(socket_fd >= 0); | |
eb17e935 | 480 | return dup2(socket_fd, fileno) < 0 ? -errno : fileno; |
94f04347 LP |
481 | |
482 | default: | |
80876c20 | 483 | assert_not_reached("Unknown error type"); |
94f04347 | 484 | } |
071830ff LP |
485 | } |
486 | ||
02a51aba LP |
487 | static int chown_terminal(int fd, uid_t uid) { |
488 | struct stat st; | |
489 | ||
490 | assert(fd >= 0); | |
02a51aba LP |
491 | |
492 | /* This might fail. What matters are the results. */ | |
bab45044 LP |
493 | (void) fchown(fd, uid, -1); |
494 | (void) fchmod(fd, TTY_MODE); | |
02a51aba LP |
495 | |
496 | if (fstat(fd, &st) < 0) | |
497 | return -errno; | |
498 | ||
d8b4e2e9 | 499 | if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE) |
02a51aba LP |
500 | return -EPERM; |
501 | ||
502 | return 0; | |
503 | } | |
504 | ||
af6da548 | 505 | static int setup_confirm_stdio(int *_saved_stdin, |
80876c20 LP |
506 | int *_saved_stdout) { |
507 | int fd = -1, saved_stdin, saved_stdout = -1, r; | |
508 | ||
80876c20 LP |
509 | assert(_saved_stdin); |
510 | assert(_saved_stdout); | |
511 | ||
af6da548 LP |
512 | saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3); |
513 | if (saved_stdin < 0) | |
514 | return -errno; | |
80876c20 | 515 | |
af6da548 LP |
516 | saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3); |
517 | if (saved_stdout < 0) { | |
518 | r = errno; | |
80876c20 LP |
519 | goto fail; |
520 | } | |
521 | ||
af6da548 LP |
522 | fd = acquire_terminal( |
523 | "/dev/console", | |
524 | false, | |
525 | false, | |
526 | false, | |
527 | DEFAULT_CONFIRM_USEC); | |
528 | if (fd < 0) { | |
529 | r = fd; | |
80876c20 LP |
530 | goto fail; |
531 | } | |
532 | ||
af6da548 LP |
533 | r = chown_terminal(fd, getuid()); |
534 | if (r < 0) | |
02a51aba | 535 | goto fail; |
02a51aba | 536 | |
80876c20 | 537 | if (dup2(fd, STDIN_FILENO) < 0) { |
af6da548 | 538 | r = -errno; |
80876c20 LP |
539 | goto fail; |
540 | } | |
541 | ||
542 | if (dup2(fd, STDOUT_FILENO) < 0) { | |
af6da548 | 543 | r = -errno; |
80876c20 LP |
544 | goto fail; |
545 | } | |
546 | ||
547 | if (fd >= 2) | |
03e334a1 | 548 | safe_close(fd); |
80876c20 LP |
549 | |
550 | *_saved_stdin = saved_stdin; | |
551 | *_saved_stdout = saved_stdout; | |
552 | ||
553 | return 0; | |
554 | ||
555 | fail: | |
03e334a1 LP |
556 | safe_close(saved_stdout); |
557 | safe_close(saved_stdin); | |
558 | safe_close(fd); | |
80876c20 LP |
559 | |
560 | return r; | |
561 | } | |
562 | ||
44b601bc | 563 | _printf_(1, 2) static int write_confirm_message(const char *format, ...) { |
03e334a1 | 564 | _cleanup_close_ int fd = -1; |
af6da548 | 565 | va_list ap; |
80876c20 | 566 | |
af6da548 | 567 | assert(format); |
80876c20 | 568 | |
af6da548 LP |
569 | fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); |
570 | if (fd < 0) | |
571 | return fd; | |
80876c20 | 572 | |
af6da548 LP |
573 | va_start(ap, format); |
574 | vdprintf(fd, format, ap); | |
575 | va_end(ap); | |
80876c20 | 576 | |
af6da548 LP |
577 | return 0; |
578 | } | |
80876c20 | 579 | |
af6da548 LP |
580 | static int restore_confirm_stdio(int *saved_stdin, |
581 | int *saved_stdout) { | |
80876c20 | 582 | |
af6da548 | 583 | int r = 0; |
80876c20 | 584 | |
af6da548 LP |
585 | assert(saved_stdin); |
586 | assert(saved_stdout); | |
587 | ||
588 | release_terminal(); | |
589 | ||
590 | if (*saved_stdin >= 0) | |
80876c20 | 591 | if (dup2(*saved_stdin, STDIN_FILENO) < 0) |
af6da548 | 592 | r = -errno; |
80876c20 | 593 | |
af6da548 | 594 | if (*saved_stdout >= 0) |
80876c20 | 595 | if (dup2(*saved_stdout, STDOUT_FILENO) < 0) |
af6da548 | 596 | r = -errno; |
80876c20 | 597 | |
03e334a1 LP |
598 | safe_close(*saved_stdin); |
599 | safe_close(*saved_stdout); | |
af6da548 LP |
600 | |
601 | return r; | |
602 | } | |
603 | ||
604 | static int ask_for_confirmation(char *response, char **argv) { | |
605 | int saved_stdout = -1, saved_stdin = -1, r; | |
e1d75803 | 606 | _cleanup_free_ char *line = NULL; |
af6da548 LP |
607 | |
608 | r = setup_confirm_stdio(&saved_stdin, &saved_stdout); | |
609 | if (r < 0) | |
610 | return r; | |
611 | ||
612 | line = exec_command_line(argv); | |
613 | if (!line) | |
614 | return -ENOMEM; | |
615 | ||
418b9be5 | 616 | r = ask_char(response, "yns", "Execute %s? [Yes, No, Skip] ", line); |
af6da548 LP |
617 | |
618 | restore_confirm_stdio(&saved_stdin, &saved_stdout); | |
619 | ||
620 | return r; | |
80876c20 LP |
621 | } |
622 | ||
81a2b7ce LP |
623 | static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) { |
624 | bool keep_groups = false; | |
625 | int r; | |
626 | ||
627 | assert(context); | |
628 | ||
35b8ca3a | 629 | /* Lookup and set GID and supplementary group list. Here too |
81a2b7ce LP |
630 | * we avoid NSS lookups for gid=0. */ |
631 | ||
632 | if (context->group || username) { | |
81a2b7ce LP |
633 | /* First step, initialize groups from /etc/groups */ |
634 | if (username && gid != 0) { | |
635 | if (initgroups(username, gid) < 0) | |
636 | return -errno; | |
637 | ||
638 | keep_groups = true; | |
639 | } | |
640 | ||
641 | /* Second step, set our gids */ | |
642 | if (setresgid(gid, gid, gid) < 0) | |
643 | return -errno; | |
644 | } | |
645 | ||
646 | if (context->supplementary_groups) { | |
647 | int ngroups_max, k; | |
648 | gid_t *gids; | |
649 | char **i; | |
650 | ||
651 | /* Final step, initialize any manually set supplementary groups */ | |
da19d5c1 | 652 | assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0); |
81a2b7ce LP |
653 | |
654 | if (!(gids = new(gid_t, ngroups_max))) | |
655 | return -ENOMEM; | |
656 | ||
657 | if (keep_groups) { | |
3cc2aff1 LP |
658 | k = getgroups(ngroups_max, gids); |
659 | if (k < 0) { | |
81a2b7ce LP |
660 | free(gids); |
661 | return -errno; | |
662 | } | |
663 | } else | |
664 | k = 0; | |
665 | ||
666 | STRV_FOREACH(i, context->supplementary_groups) { | |
4b67834e | 667 | const char *g; |
81a2b7ce LP |
668 | |
669 | if (k >= ngroups_max) { | |
670 | free(gids); | |
671 | return -E2BIG; | |
672 | } | |
673 | ||
4b67834e LP |
674 | g = *i; |
675 | r = get_group_creds(&g, gids+k); | |
676 | if (r < 0) { | |
81a2b7ce LP |
677 | free(gids); |
678 | return r; | |
679 | } | |
680 | ||
681 | k++; | |
682 | } | |
683 | ||
684 | if (setgroups(k, gids) < 0) { | |
685 | free(gids); | |
686 | return -errno; | |
687 | } | |
688 | ||
689 | free(gids); | |
690 | } | |
691 | ||
692 | return 0; | |
693 | } | |
694 | ||
695 | static int enforce_user(const ExecContext *context, uid_t uid) { | |
81a2b7ce LP |
696 | assert(context); |
697 | ||
698 | /* Sets (but doesn't lookup) the uid and make sure we keep the | |
699 | * capabilities while doing so. */ | |
700 | ||
701 | if (context->capabilities) { | |
5ce70e5b | 702 | _cleanup_cap_free_ cap_t d = NULL; |
81a2b7ce LP |
703 | static const cap_value_t bits[] = { |
704 | CAP_SETUID, /* Necessary so that we can run setresuid() below */ | |
705 | CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */ | |
706 | }; | |
707 | ||
708 | /* First step: If we need to keep capabilities but | |
709 | * drop privileges we need to make sure we keep our | |
cbb21cca | 710 | * caps, while we drop privileges. */ |
693ced48 | 711 | if (uid != 0) { |
cbb21cca | 712 | int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS; |
693ced48 LP |
713 | |
714 | if (prctl(PR_GET_SECUREBITS) != sb) | |
715 | if (prctl(PR_SET_SECUREBITS, sb) < 0) | |
716 | return -errno; | |
717 | } | |
81a2b7ce | 718 | |
35b8ca3a | 719 | /* Second step: set the capabilities. This will reduce |
81a2b7ce LP |
720 | * the capabilities to the minimum we need. */ |
721 | ||
5ce70e5b ZJS |
722 | d = cap_dup(context->capabilities); |
723 | if (!d) | |
81a2b7ce LP |
724 | return -errno; |
725 | ||
726 | if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 || | |
5ce70e5b ZJS |
727 | cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) |
728 | return -errno; | |
81a2b7ce | 729 | |
5ce70e5b ZJS |
730 | if (cap_set_proc(d) < 0) |
731 | return -errno; | |
81a2b7ce LP |
732 | } |
733 | ||
734 | /* Third step: actually set the uids */ | |
735 | if (setresuid(uid, uid, uid) < 0) | |
736 | return -errno; | |
737 | ||
738 | /* At this point we should have all necessary capabilities but | |
739 | are otherwise a normal user. However, the caps might got | |
740 | corrupted due to the setresuid() so we need clean them up | |
741 | later. This is done outside of this call. */ | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
5b6319dc LP |
746 | #ifdef HAVE_PAM |
747 | ||
748 | static int null_conv( | |
749 | int num_msg, | |
750 | const struct pam_message **msg, | |
751 | struct pam_response **resp, | |
752 | void *appdata_ptr) { | |
753 | ||
754 | /* We don't support conversations */ | |
755 | ||
756 | return PAM_CONV_ERR; | |
757 | } | |
758 | ||
759 | static int setup_pam( | |
760 | const char *name, | |
761 | const char *user, | |
940c5210 | 762 | uid_t uid, |
5b6319dc LP |
763 | const char *tty, |
764 | char ***pam_env, | |
765 | int fds[], unsigned n_fds) { | |
766 | ||
767 | static const struct pam_conv conv = { | |
768 | .conv = null_conv, | |
769 | .appdata_ptr = NULL | |
770 | }; | |
771 | ||
2d7c6aa2 | 772 | _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL; |
5b6319dc | 773 | pam_handle_t *handle = NULL; |
d6e5f3ad | 774 | sigset_t old_ss; |
5b6319dc | 775 | int pam_code = PAM_SUCCESS; |
2d7c6aa2 | 776 | int err = 0; |
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 | ||
2d7c6aa2 DH |
793 | err = barrier_create(&barrier); |
794 | if (err < 0) | |
795 | goto fail; | |
796 | ||
553d2243 | 797 | if (log_get_max_level() < LOG_DEBUG) |
970edce6 ZJS |
798 | flags |= PAM_SILENT; |
799 | ||
f546241b ZJS |
800 | pam_code = pam_start(name, user, &conv, &handle); |
801 | if (pam_code != PAM_SUCCESS) { | |
5b6319dc LP |
802 | handle = NULL; |
803 | goto fail; | |
804 | } | |
805 | ||
f546241b ZJS |
806 | if (tty) { |
807 | pam_code = pam_set_item(handle, PAM_TTY, tty); | |
808 | if (pam_code != PAM_SUCCESS) | |
5b6319dc | 809 | goto fail; |
f546241b | 810 | } |
5b6319dc | 811 | |
970edce6 | 812 | pam_code = pam_acct_mgmt(handle, flags); |
f546241b | 813 | if (pam_code != PAM_SUCCESS) |
5b6319dc LP |
814 | goto fail; |
815 | ||
970edce6 | 816 | pam_code = pam_open_session(handle, flags); |
f546241b | 817 | if (pam_code != PAM_SUCCESS) |
5b6319dc LP |
818 | goto fail; |
819 | ||
820 | close_session = true; | |
821 | ||
f546241b ZJS |
822 | e = pam_getenvlist(handle); |
823 | if (!e) { | |
5b6319dc LP |
824 | pam_code = PAM_BUF_ERR; |
825 | goto fail; | |
826 | } | |
827 | ||
828 | /* Block SIGTERM, so that we know that it won't get lost in | |
829 | * the child */ | |
ce30c8dc | 830 | |
72c0a2c2 | 831 | assert_se(sigprocmask_many(SIG_BLOCK, &old_ss, SIGTERM, -1) >= 0); |
5b6319dc LP |
832 | |
833 | parent_pid = getpid(); | |
834 | ||
f546241b ZJS |
835 | pam_pid = fork(); |
836 | if (pam_pid < 0) | |
5b6319dc LP |
837 | goto fail; |
838 | ||
839 | if (pam_pid == 0) { | |
840 | int sig; | |
841 | int r = EXIT_PAM; | |
842 | ||
843 | /* The child's job is to reset the PAM session on | |
844 | * termination */ | |
2d7c6aa2 | 845 | barrier_set_role(&barrier, BARRIER_CHILD); |
5b6319dc LP |
846 | |
847 | /* This string must fit in 10 chars (i.e. the length | |
5d6b1584 LP |
848 | * of "/sbin/init"), to look pretty in /bin/ps */ |
849 | rename_process("(sd-pam)"); | |
5b6319dc LP |
850 | |
851 | /* Make sure we don't keep open the passed fds in this | |
852 | child. We assume that otherwise only those fds are | |
853 | open here that have been opened by PAM. */ | |
854 | close_many(fds, n_fds); | |
855 | ||
940c5210 AK |
856 | /* Drop privileges - we don't need any to pam_close_session |
857 | * and this will make PR_SET_PDEATHSIG work in most cases. | |
858 | * If this fails, ignore the error - but expect sd-pam threads | |
859 | * to fail to exit normally */ | |
860 | if (setresuid(uid, uid, uid) < 0) | |
da927ba9 | 861 | log_error_errno(r, "Error: Failed to setresuid() in sd-pam: %m"); |
940c5210 | 862 | |
ce30c8dc LP |
863 | (void) ignore_signals(SIGPIPE, -1); |
864 | ||
940c5210 AK |
865 | /* Wait until our parent died. This will only work if |
866 | * the above setresuid() succeeds, otherwise the kernel | |
867 | * will not allow unprivileged parents kill their privileged | |
868 | * children this way. We rely on the control groups kill logic | |
5b6319dc LP |
869 | * to do the rest for us. */ |
870 | if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) | |
871 | goto child_finish; | |
872 | ||
2d7c6aa2 DH |
873 | /* Tell the parent that our setup is done. This is especially |
874 | * important regarding dropping privileges. Otherwise, unit | |
875 | * setup might race against our setresuid(2) call. */ | |
876 | barrier_place(&barrier); | |
877 | ||
5b6319dc LP |
878 | /* Check if our parent process might already have |
879 | * died? */ | |
880 | if (getppid() == parent_pid) { | |
d6e5f3ad DM |
881 | sigset_t ss; |
882 | ||
883 | assert_se(sigemptyset(&ss) >= 0); | |
884 | assert_se(sigaddset(&ss, SIGTERM) >= 0); | |
885 | ||
3dead8d9 LP |
886 | for (;;) { |
887 | if (sigwait(&ss, &sig) < 0) { | |
888 | if (errno == EINTR) | |
889 | continue; | |
890 | ||
891 | goto child_finish; | |
892 | } | |
5b6319dc | 893 | |
3dead8d9 LP |
894 | assert(sig == SIGTERM); |
895 | break; | |
896 | } | |
5b6319dc LP |
897 | } |
898 | ||
3dead8d9 | 899 | /* If our parent died we'll end the session */ |
f546241b | 900 | if (getppid() != parent_pid) { |
970edce6 | 901 | pam_code = pam_close_session(handle, flags); |
f546241b | 902 | if (pam_code != PAM_SUCCESS) |
5b6319dc | 903 | goto child_finish; |
f546241b | 904 | } |
5b6319dc LP |
905 | |
906 | r = 0; | |
907 | ||
908 | child_finish: | |
970edce6 | 909 | pam_end(handle, pam_code | flags); |
5b6319dc LP |
910 | _exit(r); |
911 | } | |
912 | ||
2d7c6aa2 DH |
913 | barrier_set_role(&barrier, BARRIER_PARENT); |
914 | ||
5b6319dc LP |
915 | /* If the child was forked off successfully it will do all the |
916 | * cleanups, so forget about the handle here. */ | |
917 | handle = NULL; | |
918 | ||
3b8bddde | 919 | /* Unblock SIGTERM again in the parent */ |
72c0a2c2 | 920 | assert_se(sigprocmask(SIG_SETMASK, &old_ss, NULL) >= 0); |
5b6319dc LP |
921 | |
922 | /* We close the log explicitly here, since the PAM modules | |
923 | * might have opened it, but we don't want this fd around. */ | |
924 | closelog(); | |
925 | ||
2d7c6aa2 DH |
926 | /* Synchronously wait for the child to initialize. We don't care for |
927 | * errors as we cannot recover. However, warn loudly if it happens. */ | |
928 | if (!barrier_place_and_sync(&barrier)) | |
929 | log_error("PAM initialization failed"); | |
930 | ||
aa87e624 LP |
931 | *pam_env = e; |
932 | e = NULL; | |
933 | ||
5b6319dc LP |
934 | return 0; |
935 | ||
936 | fail: | |
970edce6 ZJS |
937 | if (pam_code != PAM_SUCCESS) { |
938 | log_error("PAM failed: %s", pam_strerror(handle, pam_code)); | |
9ba35398 | 939 | err = -EPERM; /* PAM errors do not map to errno */ |
970edce6 | 940 | } else { |
2d7c6aa2 | 941 | err = log_error_errno(err < 0 ? err : errno, "PAM failed: %m"); |
970edce6 | 942 | } |
9ba35398 | 943 | |
5b6319dc LP |
944 | if (handle) { |
945 | if (close_session) | |
970edce6 | 946 | pam_code = pam_close_session(handle, flags); |
5b6319dc | 947 | |
970edce6 | 948 | pam_end(handle, pam_code | flags); |
5b6319dc LP |
949 | } |
950 | ||
951 | strv_free(e); | |
952 | ||
953 | closelog(); | |
954 | ||
430c18ed | 955 | if (pam_pid > 1) { |
5b6319dc | 956 | kill(pam_pid, SIGTERM); |
430c18ed LP |
957 | kill(pam_pid, SIGCONT); |
958 | } | |
5b6319dc | 959 | |
9ba35398 | 960 | return err; |
5b6319dc LP |
961 | } |
962 | #endif | |
963 | ||
5d6b1584 LP |
964 | static void rename_process_from_path(const char *path) { |
965 | char process_name[11]; | |
966 | const char *p; | |
967 | size_t l; | |
968 | ||
969 | /* This resulting string must fit in 10 chars (i.e. the length | |
970 | * of "/sbin/init") to look pretty in /bin/ps */ | |
971 | ||
2b6bf07d | 972 | p = basename(path); |
5d6b1584 LP |
973 | if (isempty(p)) { |
974 | rename_process("(...)"); | |
975 | return; | |
976 | } | |
977 | ||
978 | l = strlen(p); | |
979 | if (l > 8) { | |
980 | /* The end of the process name is usually more | |
981 | * interesting, since the first bit might just be | |
982 | * "systemd-" */ | |
983 | p = p + l - 8; | |
984 | l = 8; | |
985 | } | |
986 | ||
987 | process_name[0] = '('; | |
988 | memcpy(process_name+1, p, l); | |
989 | process_name[1+l] = ')'; | |
990 | process_name[1+l+1] = 0; | |
991 | ||
992 | rename_process(process_name); | |
993 | } | |
994 | ||
c0467cf3 | 995 | #ifdef HAVE_SECCOMP |
17df7223 | 996 | |
822a5960 | 997 | static int apply_seccomp(const ExecContext *c) { |
17df7223 LP |
998 | uint32_t negative_action, action; |
999 | scmp_filter_ctx *seccomp; | |
c0467cf3 RC |
1000 | Iterator i; |
1001 | void *id; | |
17df7223 | 1002 | int r; |
8351ceae | 1003 | |
c0467cf3 | 1004 | assert(c); |
8351ceae | 1005 | |
17df7223 LP |
1006 | negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno); |
1007 | ||
1008 | seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW); | |
1009 | if (!seccomp) | |
1010 | return -ENOMEM; | |
8351ceae | 1011 | |
e9642be2 LP |
1012 | if (c->syscall_archs) { |
1013 | ||
1014 | SET_FOREACH(id, c->syscall_archs, i) { | |
1015 | r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1); | |
1016 | if (r == -EEXIST) | |
1017 | continue; | |
7c66bae2 LP |
1018 | if (r < 0) |
1019 | goto finish; | |
e9642be2 | 1020 | } |
e9642be2 | 1021 | |
7c66bae2 | 1022 | } else { |
e9642be2 | 1023 | r = seccomp_add_secondary_archs(seccomp); |
7c66bae2 LP |
1024 | if (r < 0) |
1025 | goto finish; | |
57183d11 | 1026 | } |
8351ceae | 1027 | |
57183d11 | 1028 | action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action; |
17df7223 LP |
1029 | SET_FOREACH(id, c->syscall_filter, i) { |
1030 | r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0); | |
7c66bae2 LP |
1031 | if (r < 0) |
1032 | goto finish; | |
c0467cf3 | 1033 | } |
8351ceae | 1034 | |
7c66bae2 LP |
1035 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); |
1036 | if (r < 0) | |
1037 | goto finish; | |
1038 | ||
17df7223 | 1039 | r = seccomp_load(seccomp); |
7c66bae2 LP |
1040 | |
1041 | finish: | |
17df7223 | 1042 | seccomp_release(seccomp); |
4298d0b5 LP |
1043 | return r; |
1044 | } | |
1045 | ||
822a5960 | 1046 | static int apply_address_families(const ExecContext *c) { |
4298d0b5 LP |
1047 | scmp_filter_ctx *seccomp; |
1048 | Iterator i; | |
1049 | int r; | |
1050 | ||
1051 | assert(c); | |
1052 | ||
1053 | seccomp = seccomp_init(SCMP_ACT_ALLOW); | |
1054 | if (!seccomp) | |
1055 | return -ENOMEM; | |
1056 | ||
1057 | r = seccomp_add_secondary_archs(seccomp); | |
1058 | if (r < 0) | |
1059 | goto finish; | |
1060 | ||
1061 | if (c->address_families_whitelist) { | |
1062 | int af, first = 0, last = 0; | |
1063 | void *afp; | |
1064 | ||
1065 | /* If this is a whitelist, we first block the address | |
1066 | * families that are out of range and then everything | |
1067 | * that is not in the set. First, we find the lowest | |
1068 | * and highest address family in the set. */ | |
1069 | ||
1070 | SET_FOREACH(afp, c->address_families, i) { | |
1071 | af = PTR_TO_INT(afp); | |
17df7223 | 1072 | |
4298d0b5 LP |
1073 | if (af <= 0 || af >= af_max()) |
1074 | continue; | |
1075 | ||
1076 | if (first == 0 || af < first) | |
1077 | first = af; | |
1078 | ||
1079 | if (last == 0 || af > last) | |
1080 | last = af; | |
1081 | } | |
1082 | ||
1083 | assert((first == 0) == (last == 0)); | |
1084 | ||
1085 | if (first == 0) { | |
1086 | ||
1087 | /* No entries in the valid range, block everything */ | |
1088 | r = seccomp_rule_add( | |
1089 | seccomp, | |
1090 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1091 | SCMP_SYS(socket), | |
1092 | 0); | |
1093 | if (r < 0) | |
1094 | goto finish; | |
1095 | ||
1096 | } else { | |
1097 | ||
1098 | /* Block everything below the first entry */ | |
1099 | r = seccomp_rule_add( | |
1100 | seccomp, | |
1101 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1102 | SCMP_SYS(socket), | |
1103 | 1, | |
1104 | SCMP_A0(SCMP_CMP_LT, first)); | |
1105 | if (r < 0) | |
1106 | goto finish; | |
1107 | ||
1108 | /* Block everything above the last entry */ | |
1109 | r = seccomp_rule_add( | |
1110 | seccomp, | |
1111 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1112 | SCMP_SYS(socket), | |
1113 | 1, | |
1114 | SCMP_A0(SCMP_CMP_GT, last)); | |
1115 | if (r < 0) | |
1116 | goto finish; | |
1117 | ||
1118 | /* Block everything between the first and last | |
1119 | * entry */ | |
1120 | for (af = 1; af < af_max(); af++) { | |
1121 | ||
1122 | if (set_contains(c->address_families, INT_TO_PTR(af))) | |
1123 | continue; | |
1124 | ||
1125 | r = seccomp_rule_add( | |
1126 | seccomp, | |
1127 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1128 | SCMP_SYS(socket), | |
1129 | 1, | |
1130 | SCMP_A0(SCMP_CMP_EQ, af)); | |
1131 | if (r < 0) | |
1132 | goto finish; | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | } else { | |
1137 | void *af; | |
1138 | ||
1139 | /* If this is a blacklist, then generate one rule for | |
1140 | * each address family that are then combined in OR | |
1141 | * checks. */ | |
1142 | ||
1143 | SET_FOREACH(af, c->address_families, i) { | |
1144 | ||
1145 | r = seccomp_rule_add( | |
1146 | seccomp, | |
1147 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1148 | SCMP_SYS(socket), | |
1149 | 1, | |
1150 | SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af))); | |
1151 | if (r < 0) | |
1152 | goto finish; | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1157 | if (r < 0) | |
1158 | goto finish; | |
1159 | ||
1160 | r = seccomp_load(seccomp); | |
1161 | ||
1162 | finish: | |
1163 | seccomp_release(seccomp); | |
17df7223 | 1164 | return r; |
8351ceae | 1165 | } |
4298d0b5 | 1166 | |
c0467cf3 | 1167 | #endif |
8351ceae | 1168 | |
31a7eb86 ZJS |
1169 | static void do_idle_pipe_dance(int idle_pipe[4]) { |
1170 | assert(idle_pipe); | |
1171 | ||
03e334a1 | 1172 | |
54eb2300 LP |
1173 | idle_pipe[1] = safe_close(idle_pipe[1]); |
1174 | idle_pipe[2] = safe_close(idle_pipe[2]); | |
31a7eb86 ZJS |
1175 | |
1176 | if (idle_pipe[0] >= 0) { | |
1177 | int r; | |
1178 | ||
1179 | r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC); | |
1180 | ||
1181 | if (idle_pipe[3] >= 0 && r == 0 /* timeout */) { | |
c7cc737f LP |
1182 | ssize_t n; |
1183 | ||
31a7eb86 | 1184 | /* Signal systemd that we are bored and want to continue. */ |
c7cc737f LP |
1185 | n = write(idle_pipe[3], "x", 1); |
1186 | if (n > 0) | |
cd972d69 ZJS |
1187 | /* Wait for systemd to react to the signal above. */ |
1188 | fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC); | |
31a7eb86 ZJS |
1189 | } |
1190 | ||
54eb2300 | 1191 | idle_pipe[0] = safe_close(idle_pipe[0]); |
31a7eb86 ZJS |
1192 | |
1193 | } | |
1194 | ||
54eb2300 | 1195 | idle_pipe[3] = safe_close(idle_pipe[3]); |
31a7eb86 ZJS |
1196 | } |
1197 | ||
7cae38c4 | 1198 | static int build_environment( |
9fa95f85 | 1199 | const ExecContext *c, |
7cae38c4 | 1200 | unsigned n_fds, |
09812eb7 | 1201 | usec_t watchdog_usec, |
7cae38c4 LP |
1202 | const char *home, |
1203 | const char *username, | |
1204 | const char *shell, | |
1205 | char ***ret) { | |
1206 | ||
1207 | _cleanup_strv_free_ char **our_env = NULL; | |
1208 | unsigned n_env = 0; | |
1209 | char *x; | |
1210 | ||
1211 | assert(c); | |
1212 | assert(ret); | |
1213 | ||
09812eb7 | 1214 | our_env = new0(char*, 10); |
7cae38c4 LP |
1215 | if (!our_env) |
1216 | return -ENOMEM; | |
1217 | ||
1218 | if (n_fds > 0) { | |
ccd06097 | 1219 | if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0) |
7cae38c4 LP |
1220 | return -ENOMEM; |
1221 | our_env[n_env++] = x; | |
1222 | ||
1223 | if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0) | |
1224 | return -ENOMEM; | |
1225 | our_env[n_env++] = x; | |
1226 | } | |
1227 | ||
09812eb7 | 1228 | if (watchdog_usec > 0) { |
ccd06097 | 1229 | if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0) |
09812eb7 LP |
1230 | return -ENOMEM; |
1231 | our_env[n_env++] = x; | |
1232 | ||
de0671ee | 1233 | if (asprintf(&x, "WATCHDOG_USEC="USEC_FMT, watchdog_usec) < 0) |
09812eb7 LP |
1234 | return -ENOMEM; |
1235 | our_env[n_env++] = x; | |
1236 | } | |
1237 | ||
7cae38c4 LP |
1238 | if (home) { |
1239 | x = strappend("HOME=", home); | |
1240 | if (!x) | |
1241 | return -ENOMEM; | |
1242 | our_env[n_env++] = x; | |
1243 | } | |
1244 | ||
1245 | if (username) { | |
1246 | x = strappend("LOGNAME=", username); | |
1247 | if (!x) | |
1248 | return -ENOMEM; | |
1249 | our_env[n_env++] = x; | |
1250 | ||
1251 | x = strappend("USER=", username); | |
1252 | if (!x) | |
1253 | return -ENOMEM; | |
1254 | our_env[n_env++] = x; | |
1255 | } | |
1256 | ||
1257 | if (shell) { | |
1258 | x = strappend("SHELL=", shell); | |
1259 | if (!x) | |
1260 | return -ENOMEM; | |
1261 | our_env[n_env++] = x; | |
1262 | } | |
1263 | ||
1264 | if (is_terminal_input(c->std_input) || | |
1265 | c->std_output == EXEC_OUTPUT_TTY || | |
1266 | c->std_error == EXEC_OUTPUT_TTY || | |
1267 | c->tty_path) { | |
1268 | ||
1269 | x = strdup(default_term_for_tty(tty_path(c))); | |
1270 | if (!x) | |
1271 | return -ENOMEM; | |
1272 | our_env[n_env++] = x; | |
1273 | } | |
1274 | ||
1275 | our_env[n_env++] = NULL; | |
09812eb7 | 1276 | assert(n_env <= 10); |
7cae38c4 LP |
1277 | |
1278 | *ret = our_env; | |
1279 | our_env = NULL; | |
1280 | ||
1281 | return 0; | |
1282 | } | |
1283 | ||
8b44a3d2 LP |
1284 | static bool exec_needs_mount_namespace( |
1285 | const ExecContext *context, | |
1286 | const ExecParameters *params, | |
1287 | ExecRuntime *runtime) { | |
1288 | ||
1289 | assert(context); | |
1290 | assert(params); | |
1291 | ||
1292 | if (!strv_isempty(context->read_write_dirs) || | |
1293 | !strv_isempty(context->read_only_dirs) || | |
1294 | !strv_isempty(context->inaccessible_dirs)) | |
1295 | return true; | |
1296 | ||
1297 | if (context->mount_flags != 0) | |
1298 | return true; | |
1299 | ||
1300 | if (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) | |
1301 | return true; | |
1302 | ||
1303 | if (params->bus_endpoint_path) | |
1304 | return true; | |
1305 | ||
1306 | if (context->private_devices || | |
1307 | context->protect_system != PROTECT_SYSTEM_NO || | |
1308 | context->protect_home != PROTECT_HOME_NO) | |
1309 | return true; | |
1310 | ||
1311 | return false; | |
1312 | } | |
1313 | ||
ff0af2a1 | 1314 | static int exec_child( |
f2341e0a | 1315 | Unit *unit, |
ff0af2a1 LP |
1316 | ExecCommand *command, |
1317 | const ExecContext *context, | |
1318 | const ExecParameters *params, | |
1319 | ExecRuntime *runtime, | |
1320 | char **argv, | |
1321 | int socket_fd, | |
1322 | int *fds, unsigned n_fds, | |
1323 | char **files_env, | |
1324 | int *exit_status) { | |
d35fbf6b DM |
1325 | |
1326 | _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL; | |
9008e1ac | 1327 | _cleanup_free_ char *mac_selinux_context_net = NULL; |
d35fbf6b DM |
1328 | const char *username = NULL, *home = NULL, *shell = NULL; |
1329 | unsigned n_dont_close = 0; | |
e44da745 | 1330 | int dont_close[n_fds + 4]; |
fed1e721 LP |
1331 | uid_t uid = UID_INVALID; |
1332 | gid_t gid = GID_INVALID; | |
ff0af2a1 | 1333 | int i, r; |
ee818b89 | 1334 | bool needs_mount_namespace; |
034c6ed7 | 1335 | |
f2341e0a | 1336 | assert(unit); |
5cb5a6ff LP |
1337 | assert(command); |
1338 | assert(context); | |
d35fbf6b | 1339 | assert(params); |
ff0af2a1 | 1340 | assert(exit_status); |
d35fbf6b DM |
1341 | |
1342 | rename_process_from_path(command->path); | |
1343 | ||
1344 | /* We reset exactly these signals, since they are the | |
1345 | * only ones we set to SIG_IGN in the main daemon. All | |
1346 | * others we leave untouched because we set them to | |
1347 | * SIG_DFL or a valid handler initially, both of which | |
1348 | * will be demoted to SIG_DFL. */ | |
ce30c8dc LP |
1349 | (void) default_signals(SIGNALS_CRASH_HANDLER, |
1350 | SIGNALS_IGNORE, -1); | |
d35fbf6b DM |
1351 | |
1352 | if (context->ignore_sigpipe) | |
ce30c8dc | 1353 | (void) ignore_signals(SIGPIPE, -1); |
d35fbf6b | 1354 | |
ff0af2a1 LP |
1355 | r = reset_signal_mask(); |
1356 | if (r < 0) { | |
1357 | *exit_status = EXIT_SIGNAL_MASK; | |
1358 | return r; | |
d35fbf6b | 1359 | } |
034c6ed7 | 1360 | |
d35fbf6b DM |
1361 | if (params->idle_pipe) |
1362 | do_idle_pipe_dance(params->idle_pipe); | |
4f2d528d | 1363 | |
d35fbf6b DM |
1364 | /* Close sockets very early to make sure we don't |
1365 | * block init reexecution because it cannot bind its | |
1366 | * sockets */ | |
ff0af2a1 | 1367 | |
d35fbf6b | 1368 | log_forget_fds(); |
4f2d528d | 1369 | |
d35fbf6b DM |
1370 | if (socket_fd >= 0) |
1371 | dont_close[n_dont_close++] = socket_fd; | |
1372 | if (n_fds > 0) { | |
1373 | memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds); | |
1374 | n_dont_close += n_fds; | |
1375 | } | |
e44da745 DM |
1376 | if (params->bus_endpoint_fd >= 0) |
1377 | dont_close[n_dont_close++] = params->bus_endpoint_fd; | |
d35fbf6b DM |
1378 | if (runtime) { |
1379 | if (runtime->netns_storage_socket[0] >= 0) | |
1380 | dont_close[n_dont_close++] = runtime->netns_storage_socket[0]; | |
1381 | if (runtime->netns_storage_socket[1] >= 0) | |
1382 | dont_close[n_dont_close++] = runtime->netns_storage_socket[1]; | |
9fa95f85 | 1383 | } |
4f2d528d | 1384 | |
ff0af2a1 LP |
1385 | r = close_all_fds(dont_close, n_dont_close); |
1386 | if (r < 0) { | |
1387 | *exit_status = EXIT_FDS; | |
1388 | return r; | |
8c7be95e LP |
1389 | } |
1390 | ||
d35fbf6b DM |
1391 | if (!context->same_pgrp) |
1392 | if (setsid() < 0) { | |
ff0af2a1 | 1393 | *exit_status = EXIT_SETSID; |
d35fbf6b DM |
1394 | return -errno; |
1395 | } | |
9e2f7c11 | 1396 | |
d35fbf6b DM |
1397 | exec_context_tty_reset(context); |
1398 | ||
1399 | if (params->confirm_spawn) { | |
1400 | char response; | |
1401 | ||
ff0af2a1 LP |
1402 | r = ask_for_confirmation(&response, argv); |
1403 | if (r == -ETIMEDOUT) | |
d35fbf6b | 1404 | write_confirm_message("Confirmation question timed out, assuming positive response.\n"); |
ff0af2a1 LP |
1405 | else if (r < 0) |
1406 | write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-r)); | |
d35fbf6b DM |
1407 | else if (response == 's') { |
1408 | write_confirm_message("Skipping execution.\n"); | |
ff0af2a1 | 1409 | *exit_status = EXIT_CONFIRM; |
d35fbf6b DM |
1410 | return -ECANCELED; |
1411 | } else if (response == 'n') { | |
1412 | write_confirm_message("Failing execution.\n"); | |
ff0af2a1 | 1413 | *exit_status = 0; |
d35fbf6b DM |
1414 | return 0; |
1415 | } | |
1416 | } | |
1a63a750 | 1417 | |
524daa8c ZJS |
1418 | if (context->user) { |
1419 | username = context->user; | |
ff0af2a1 LP |
1420 | r = get_user_creds(&username, &uid, &gid, &home, &shell); |
1421 | if (r < 0) { | |
1422 | *exit_status = EXIT_USER; | |
1423 | return r; | |
524daa8c ZJS |
1424 | } |
1425 | } | |
1426 | ||
5bc7452b RC |
1427 | if (context->group) { |
1428 | const char *g = context->group; | |
1429 | ||
1430 | r = get_group_creds(&g, &gid); | |
1431 | if (r < 0) { | |
1432 | *exit_status = EXIT_GROUP; | |
1433 | return r; | |
1434 | } | |
1435 | } | |
1436 | ||
1437 | ||
d35fbf6b DM |
1438 | /* If a socket is connected to STDIN/STDOUT/STDERR, we |
1439 | * must sure to drop O_NONBLOCK */ | |
1440 | if (socket_fd >= 0) | |
1441 | fd_nonblock(socket_fd, false); | |
acbb0225 | 1442 | |
ff0af2a1 LP |
1443 | r = setup_input(context, socket_fd, params->apply_tty_stdin); |
1444 | if (r < 0) { | |
1445 | *exit_status = EXIT_STDIN; | |
1446 | return r; | |
d35fbf6b | 1447 | } |
034c6ed7 | 1448 | |
f2341e0a | 1449 | r = setup_output(unit, context, STDOUT_FILENO, socket_fd, basename(command->path), params->apply_tty_stdin, uid, gid); |
ff0af2a1 LP |
1450 | if (r < 0) { |
1451 | *exit_status = EXIT_STDOUT; | |
1452 | return r; | |
d35fbf6b DM |
1453 | } |
1454 | ||
f2341e0a | 1455 | r = setup_output(unit, context, STDERR_FILENO, socket_fd, basename(command->path), params->apply_tty_stdin, uid, gid); |
ff0af2a1 LP |
1456 | if (r < 0) { |
1457 | *exit_status = EXIT_STDERR; | |
1458 | return r; | |
d35fbf6b DM |
1459 | } |
1460 | ||
1461 | if (params->cgroup_path) { | |
ff0af2a1 LP |
1462 | r = cg_attach_everywhere(params->cgroup_supported, params->cgroup_path, 0, NULL, NULL); |
1463 | if (r < 0) { | |
1464 | *exit_status = EXIT_CGROUP; | |
1465 | return r; | |
309bff19 | 1466 | } |
d35fbf6b | 1467 | } |
309bff19 | 1468 | |
d35fbf6b | 1469 | if (context->oom_score_adjust_set) { |
d5243d62 | 1470 | char t[DECIMAL_STR_MAX(context->oom_score_adjust)]; |
f2b68789 | 1471 | |
d5243d62 LP |
1472 | /* When we can't make this change due to EPERM, then |
1473 | * let's silently skip over it. User namespaces | |
1474 | * prohibit write access to this file, and we | |
1475 | * shouldn't trip up over that. */ | |
613b411c | 1476 | |
d5243d62 | 1477 | sprintf(t, "%i", context->oom_score_adjust); |
ad118bda | 1478 | r = write_string_file("/proc/self/oom_score_adj", t, 0); |
6cb7fa17 | 1479 | if (r == -EPERM || r == -EACCES) { |
ff0af2a1 | 1480 | log_open(); |
f2341e0a | 1481 | log_unit_debug_errno(unit, r, "Failed to adjust OOM setting, assuming containerized execution, ignoring: %m"); |
ff0af2a1 LP |
1482 | log_close(); |
1483 | } else if (r < 0) { | |
1484 | *exit_status = EXIT_OOM_ADJUST; | |
d35fbf6b | 1485 | return -errno; |
613b411c | 1486 | } |
d35fbf6b DM |
1487 | } |
1488 | ||
1489 | if (context->nice_set) | |
1490 | if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) { | |
ff0af2a1 | 1491 | *exit_status = EXIT_NICE; |
d35fbf6b | 1492 | return -errno; |
613b411c LP |
1493 | } |
1494 | ||
d35fbf6b DM |
1495 | if (context->cpu_sched_set) { |
1496 | struct sched_param param = { | |
1497 | .sched_priority = context->cpu_sched_priority, | |
1498 | }; | |
1499 | ||
ff0af2a1 LP |
1500 | r = sched_setscheduler(0, |
1501 | context->cpu_sched_policy | | |
1502 | (context->cpu_sched_reset_on_fork ? | |
1503 | SCHED_RESET_ON_FORK : 0), | |
1504 | ¶m); | |
1505 | if (r < 0) { | |
1506 | *exit_status = EXIT_SETSCHEDULER; | |
d35fbf6b | 1507 | return -errno; |
fc9b2a84 | 1508 | } |
d35fbf6b | 1509 | } |
fc9b2a84 | 1510 | |
d35fbf6b DM |
1511 | if (context->cpuset) |
1512 | if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) { | |
ff0af2a1 | 1513 | *exit_status = EXIT_CPUAFFINITY; |
d35fbf6b | 1514 | return -errno; |
034c6ed7 LP |
1515 | } |
1516 | ||
d35fbf6b DM |
1517 | if (context->ioprio_set) |
1518 | if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) { | |
ff0af2a1 | 1519 | *exit_status = EXIT_IOPRIO; |
d35fbf6b DM |
1520 | return -errno; |
1521 | } | |
da726a4d | 1522 | |
d35fbf6b DM |
1523 | if (context->timer_slack_nsec != NSEC_INFINITY) |
1524 | if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) { | |
ff0af2a1 | 1525 | *exit_status = EXIT_TIMERSLACK; |
d35fbf6b | 1526 | return -errno; |
4c2630eb | 1527 | } |
9eba9da4 | 1528 | |
050f7277 | 1529 | if (context->personality != PERSONALITY_INVALID) |
d35fbf6b | 1530 | if (personality(context->personality) < 0) { |
ff0af2a1 | 1531 | *exit_status = EXIT_PERSONALITY; |
d35fbf6b | 1532 | return -errno; |
4c2630eb | 1533 | } |
94f04347 | 1534 | |
d35fbf6b | 1535 | if (context->utmp_id) |
023a4f67 LP |
1536 | utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path, |
1537 | context->utmp_mode == EXEC_UTMP_INIT ? INIT_PROCESS : | |
1538 | context->utmp_mode == EXEC_UTMP_LOGIN ? LOGIN_PROCESS : | |
1539 | USER_PROCESS, | |
1540 | username ? "root" : context->user); | |
d35fbf6b | 1541 | |
524daa8c | 1542 | if (context->user && is_terminal_input(context->std_input)) { |
ff0af2a1 LP |
1543 | r = chown_terminal(STDIN_FILENO, uid); |
1544 | if (r < 0) { | |
1545 | *exit_status = EXIT_STDIN; | |
1546 | return r; | |
071830ff | 1547 | } |
d35fbf6b | 1548 | } |
8e274523 | 1549 | |
e44da745 | 1550 | if (params->bus_endpoint_fd >= 0 && context->bus_endpoint) { |
fed1e721 | 1551 | uid_t ep_uid = (uid == UID_INVALID) ? 0 : uid; |
e44da745 | 1552 | |
ff0af2a1 LP |
1553 | r = bus_kernel_set_endpoint_policy(params->bus_endpoint_fd, ep_uid, context->bus_endpoint); |
1554 | if (r < 0) { | |
1555 | *exit_status = EXIT_BUS_ENDPOINT; | |
1556 | return r; | |
e44da745 DM |
1557 | } |
1558 | } | |
e44da745 | 1559 | |
a931ad47 LP |
1560 | /* If delegation is enabled we'll pass ownership of the cgroup |
1561 | * (but only in systemd's own controller hierarchy!) to the | |
1562 | * user of the new process. */ | |
1563 | if (params->cgroup_path && context->user && params->cgroup_delegate) { | |
ff0af2a1 LP |
1564 | r = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0644, uid, gid); |
1565 | if (r < 0) { | |
1566 | *exit_status = EXIT_CGROUP; | |
1567 | return r; | |
d35fbf6b | 1568 | } |
034c6ed7 | 1569 | |
034c6ed7 | 1570 | |
ff0af2a1 LP |
1571 | r = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0755, uid, gid); |
1572 | if (r < 0) { | |
1573 | *exit_status = EXIT_CGROUP; | |
1574 | return r; | |
034c6ed7 | 1575 | } |
d35fbf6b | 1576 | } |
034c6ed7 | 1577 | |
d35fbf6b DM |
1578 | if (!strv_isempty(context->runtime_directory) && params->runtime_prefix) { |
1579 | char **rt; | |
fb33a393 | 1580 | |
d35fbf6b DM |
1581 | STRV_FOREACH(rt, context->runtime_directory) { |
1582 | _cleanup_free_ char *p; | |
94f04347 | 1583 | |
d35fbf6b DM |
1584 | p = strjoin(params->runtime_prefix, "/", *rt, NULL); |
1585 | if (!p) { | |
ff0af2a1 | 1586 | *exit_status = EXIT_RUNTIME_DIRECTORY; |
d35fbf6b | 1587 | return -ENOMEM; |
94f04347 | 1588 | } |
94f04347 | 1589 | |
6bfe5c28 LP |
1590 | r = mkdir_p_label(p, context->runtime_directory_mode); |
1591 | if (r < 0) { | |
1592 | *exit_status = EXIT_RUNTIME_DIRECTORY; | |
1593 | return r; | |
1594 | } | |
1595 | ||
1596 | r = chmod_and_chown(p, context->runtime_directory_mode, uid, gid); | |
ff0af2a1 LP |
1597 | if (r < 0) { |
1598 | *exit_status = EXIT_RUNTIME_DIRECTORY; | |
1599 | return r; | |
94f04347 | 1600 | } |
d35fbf6b DM |
1601 | } |
1602 | } | |
94f04347 | 1603 | |
b213e1c1 SW |
1604 | umask(context->umask); |
1605 | ||
d35fbf6b | 1606 | if (params->apply_permissions) { |
ff0af2a1 LP |
1607 | r = enforce_groups(context, username, gid); |
1608 | if (r < 0) { | |
1609 | *exit_status = EXIT_GROUP; | |
1610 | return r; | |
d35fbf6b | 1611 | } |
6bf6e43e | 1612 | #ifdef HAVE_SMACK |
6bf6e43e SW |
1613 | if (context->smack_process_label) { |
1614 | r = mac_smack_apply_pid(0, context->smack_process_label); | |
1615 | if (r < 0) { | |
1616 | *exit_status = EXIT_SMACK_PROCESS_LABEL; | |
1617 | return r; | |
1618 | } | |
1619 | } | |
1620 | #ifdef SMACK_DEFAULT_PROCESS_LABEL | |
1621 | else { | |
1622 | _cleanup_free_ char *exec_label = NULL; | |
1623 | ||
1624 | r = mac_smack_read(command->path, SMACK_ATTR_EXEC, &exec_label); | |
1625 | if (r < 0 && r != -ENODATA && r != -EOPNOTSUPP) { | |
1626 | *exit_status = EXIT_SMACK_PROCESS_LABEL; | |
1627 | return r; | |
1628 | } | |
1629 | ||
1630 | r = mac_smack_apply_pid(0, exec_label ? : SMACK_DEFAULT_PROCESS_LABEL); | |
1631 | if (r < 0) { | |
1632 | *exit_status = EXIT_SMACK_PROCESS_LABEL; | |
1633 | return r; | |
1634 | } | |
1635 | } | |
6bf6e43e SW |
1636 | #endif |
1637 | #endif | |
d35fbf6b | 1638 | #ifdef HAVE_PAM |
b213e1c1 SW |
1639 | if (context->pam_name && username) { |
1640 | r = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds); | |
1641 | if (r < 0) { | |
1642 | *exit_status = EXIT_PAM; | |
1643 | return r; | |
1644 | } | |
d35fbf6b | 1645 | } |
d35fbf6b | 1646 | #endif |
b213e1c1 | 1647 | } |
ac45f971 | 1648 | |
d35fbf6b | 1649 | if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) { |
ff0af2a1 LP |
1650 | r = setup_netns(runtime->netns_storage_socket); |
1651 | if (r < 0) { | |
1652 | *exit_status = EXIT_NETWORK; | |
1653 | return r; | |
d35fbf6b DM |
1654 | } |
1655 | } | |
169c1bda | 1656 | |
ee818b89 AC |
1657 | needs_mount_namespace = exec_needs_mount_namespace(context, params, runtime); |
1658 | ||
1659 | if (needs_mount_namespace) { | |
d35fbf6b DM |
1660 | char *tmp = NULL, *var = NULL; |
1661 | ||
1662 | /* The runtime struct only contains the parent | |
1663 | * of the private /tmp, which is | |
1664 | * non-accessible to world users. Inside of it | |
1665 | * there's a /tmp that is sticky, and that's | |
1666 | * the one we want to use here. */ | |
1667 | ||
1668 | if (context->private_tmp && runtime) { | |
1669 | if (runtime->tmp_dir) | |
63c372cb | 1670 | tmp = strjoina(runtime->tmp_dir, "/tmp"); |
d35fbf6b | 1671 | if (runtime->var_tmp_dir) |
63c372cb | 1672 | var = strjoina(runtime->var_tmp_dir, "/tmp"); |
d35fbf6b | 1673 | } |
d8b4e2e9 | 1674 | |
ff0af2a1 | 1675 | r = setup_namespace( |
ee818b89 | 1676 | params->apply_chroot ? context->root_directory : NULL, |
d35fbf6b DM |
1677 | context->read_write_dirs, |
1678 | context->read_only_dirs, | |
1679 | context->inaccessible_dirs, | |
1680 | tmp, | |
1681 | var, | |
e44da745 | 1682 | params->bus_endpoint_path, |
d35fbf6b DM |
1683 | context->private_devices, |
1684 | context->protect_home, | |
1685 | context->protect_system, | |
1686 | context->mount_flags); | |
0015ebf3 | 1687 | |
ff0af2a1 LP |
1688 | /* If we couldn't set up the namespace this is |
1689 | * probably due to a missing capability. In this case, | |
1690 | * silently proceeed. */ | |
1691 | if (r == -EPERM || r == -EACCES) { | |
1692 | log_open(); | |
f2341e0a | 1693 | log_unit_debug_errno(unit, r, "Failed to set up namespace, assuming containerized execution, ignoring: %m"); |
ff0af2a1 LP |
1694 | log_close(); |
1695 | } else if (r < 0) { | |
1696 | *exit_status = EXIT_NAMESPACE; | |
1697 | return r; | |
81a2b7ce | 1698 | } |
d35fbf6b | 1699 | } |
81a2b7ce | 1700 | |
d35fbf6b | 1701 | if (params->apply_chroot) { |
ee818b89 | 1702 | if (!needs_mount_namespace && context->root_directory) |
d35fbf6b | 1703 | if (chroot(context->root_directory) < 0) { |
ff0af2a1 | 1704 | *exit_status = EXIT_CHROOT; |
d35fbf6b | 1705 | return -errno; |
8aa75193 LP |
1706 | } |
1707 | ||
4c08c824 LP |
1708 | if (chdir(context->working_directory ?: "/") < 0 && |
1709 | !context->working_directory_missing_ok) { | |
ff0af2a1 | 1710 | *exit_status = EXIT_CHDIR; |
d35fbf6b DM |
1711 | return -errno; |
1712 | } | |
1713 | } else { | |
1714 | _cleanup_free_ char *d = NULL; | |
8aa75193 | 1715 | |
d35fbf6b | 1716 | if (asprintf(&d, "%s/%s", |
cf1d0302 LP |
1717 | context->root_directory ?: "", |
1718 | context->working_directory ?: "") < 0) { | |
ff0af2a1 | 1719 | *exit_status = EXIT_MEMORY; |
d35fbf6b | 1720 | return -ENOMEM; |
8aa75193 | 1721 | } |
8aa75193 | 1722 | |
cf1d0302 LP |
1723 | if (chdir(d) < 0 && |
1724 | !context->working_directory_missing_ok) { | |
ff0af2a1 | 1725 | *exit_status = EXIT_CHDIR; |
d35fbf6b DM |
1726 | return -errno; |
1727 | } | |
1728 | } | |
e66cf1a3 | 1729 | |
9008e1ac MS |
1730 | #ifdef HAVE_SELINUX |
1731 | if (params->apply_permissions && mac_selinux_use() && params->selinux_context_net && socket_fd >= 0) { | |
ff0af2a1 LP |
1732 | r = mac_selinux_get_child_mls_label(socket_fd, command->path, context->selinux_context, &mac_selinux_context_net); |
1733 | if (r < 0) { | |
1734 | *exit_status = EXIT_SELINUX_CONTEXT; | |
1735 | return r; | |
9008e1ac MS |
1736 | } |
1737 | } | |
1738 | #endif | |
1739 | ||
d35fbf6b DM |
1740 | /* We repeat the fd closing here, to make sure that |
1741 | * nothing is leaked from the PAM modules. Note that | |
1742 | * we are more aggressive this time since socket_fd | |
e44da745 DM |
1743 | * and the netns fds we don't need anymore. The custom |
1744 | * endpoint fd was needed to upload the policy and can | |
1745 | * now be closed as well. */ | |
ff0af2a1 LP |
1746 | r = close_all_fds(fds, n_fds); |
1747 | if (r >= 0) | |
1748 | r = shift_fds(fds, n_fds); | |
1749 | if (r >= 0) | |
1750 | r = flags_fds(fds, n_fds, context->non_blocking); | |
1751 | if (r < 0) { | |
1752 | *exit_status = EXIT_FDS; | |
1753 | return r; | |
d35fbf6b | 1754 | } |
e66cf1a3 | 1755 | |
d35fbf6b | 1756 | if (params->apply_permissions) { |
e66cf1a3 | 1757 | |
d35fbf6b DM |
1758 | for (i = 0; i < _RLIMIT_MAX; i++) { |
1759 | if (!context->rlimit[i]) | |
1760 | continue; | |
1761 | ||
1762 | if (setrlimit_closest(i, context->rlimit[i]) < 0) { | |
ff0af2a1 | 1763 | *exit_status = EXIT_LIMITS; |
d35fbf6b | 1764 | return -errno; |
e66cf1a3 LP |
1765 | } |
1766 | } | |
1767 | ||
d35fbf6b | 1768 | if (context->capability_bounding_set_drop) { |
ff0af2a1 LP |
1769 | r = capability_bounding_set_drop(context->capability_bounding_set_drop, false); |
1770 | if (r < 0) { | |
1771 | *exit_status = EXIT_CAPABILITIES; | |
1772 | return r; | |
3b8bddde | 1773 | } |
4c2630eb | 1774 | } |
3b8bddde | 1775 | |
d35fbf6b | 1776 | if (context->user) { |
ff0af2a1 LP |
1777 | r = enforce_user(context, uid); |
1778 | if (r < 0) { | |
1779 | *exit_status = EXIT_USER; | |
1780 | return r; | |
5b6319dc LP |
1781 | } |
1782 | } | |
d35fbf6b DM |
1783 | |
1784 | /* PR_GET_SECUREBITS is not privileged, while | |
1785 | * PR_SET_SECUREBITS is. So to suppress | |
1786 | * potential EPERMs we'll try not to call | |
1787 | * PR_SET_SECUREBITS unless necessary. */ | |
1788 | if (prctl(PR_GET_SECUREBITS) != context->secure_bits) | |
1789 | if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) { | |
ff0af2a1 | 1790 | *exit_status = EXIT_SECUREBITS; |
d35fbf6b | 1791 | return -errno; |
ff01d048 | 1792 | } |
5b6319dc | 1793 | |
d35fbf6b DM |
1794 | if (context->capabilities) |
1795 | if (cap_set_proc(context->capabilities) < 0) { | |
ff0af2a1 | 1796 | *exit_status = EXIT_CAPABILITIES; |
d35fbf6b | 1797 | return -errno; |
613b411c LP |
1798 | } |
1799 | ||
d35fbf6b DM |
1800 | if (context->no_new_privileges) |
1801 | if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) { | |
ff0af2a1 | 1802 | *exit_status = EXIT_NO_NEW_PRIVILEGES; |
d35fbf6b DM |
1803 | return -errno; |
1804 | } | |
1805 | ||
1806 | #ifdef HAVE_SECCOMP | |
1807 | if (context->address_families_whitelist || | |
1808 | !set_isempty(context->address_families)) { | |
ff0af2a1 LP |
1809 | r = apply_address_families(context); |
1810 | if (r < 0) { | |
1811 | *exit_status = EXIT_ADDRESS_FAMILIES; | |
1812 | return r; | |
4c2630eb MS |
1813 | } |
1814 | } | |
04aa0cb9 | 1815 | |
d35fbf6b DM |
1816 | if (context->syscall_whitelist || |
1817 | !set_isempty(context->syscall_filter) || | |
1818 | !set_isempty(context->syscall_archs)) { | |
ff0af2a1 LP |
1819 | r = apply_seccomp(context); |
1820 | if (r < 0) { | |
1821 | *exit_status = EXIT_SECCOMP; | |
1822 | return r; | |
81a2b7ce | 1823 | } |
d35fbf6b DM |
1824 | } |
1825 | #endif | |
81a2b7ce | 1826 | |
d35fbf6b | 1827 | #ifdef HAVE_SELINUX |
6baa7db0 | 1828 | if (mac_selinux_use()) { |
9008e1ac | 1829 | char *exec_context = mac_selinux_context_net ?: context->selinux_context; |
16115b0a | 1830 | |
9008e1ac | 1831 | if (exec_context) { |
ff0af2a1 LP |
1832 | r = setexeccon(exec_context); |
1833 | if (r < 0) { | |
1834 | *exit_status = EXIT_SELINUX_CONTEXT; | |
1835 | return r; | |
16115b0a | 1836 | } |
81a2b7ce | 1837 | } |
81a2b7ce | 1838 | } |
d35fbf6b | 1839 | #endif |
81a2b7ce | 1840 | |
d35fbf6b | 1841 | #ifdef HAVE_APPARMOR |
6baa7db0 | 1842 | if (context->apparmor_profile && mac_apparmor_use()) { |
ff0af2a1 LP |
1843 | r = aa_change_onexec(context->apparmor_profile); |
1844 | if (r < 0 && !context->apparmor_profile_ignore) { | |
1845 | *exit_status = EXIT_APPARMOR_PROFILE; | |
5482192e | 1846 | return -errno; |
d35fbf6b | 1847 | } |
034c6ed7 | 1848 | } |
d35fbf6b DM |
1849 | #endif |
1850 | } | |
034c6ed7 | 1851 | |
ff0af2a1 LP |
1852 | r = build_environment(context, n_fds, params->watchdog_usec, home, username, shell, &our_env); |
1853 | if (r < 0) { | |
1854 | *exit_status = EXIT_MEMORY; | |
1855 | return r; | |
d35fbf6b | 1856 | } |
034c6ed7 | 1857 | |
d35fbf6b DM |
1858 | final_env = strv_env_merge(5, |
1859 | params->environment, | |
1860 | our_env, | |
1861 | context->environment, | |
1862 | files_env, | |
1863 | pam_env, | |
1864 | NULL); | |
1865 | if (!final_env) { | |
ff0af2a1 | 1866 | *exit_status = EXIT_MEMORY; |
d35fbf6b DM |
1867 | return -ENOMEM; |
1868 | } | |
81a2b7ce | 1869 | |
d35fbf6b DM |
1870 | final_argv = replace_env_argv(argv, final_env); |
1871 | if (!final_argv) { | |
ff0af2a1 | 1872 | *exit_status = EXIT_MEMORY; |
d35fbf6b DM |
1873 | return -ENOMEM; |
1874 | } | |
034c6ed7 | 1875 | |
d35fbf6b | 1876 | final_env = strv_env_clean(final_env); |
260abb78 | 1877 | |
553d2243 | 1878 | if (_unlikely_(log_get_max_level() >= LOG_DEBUG)) { |
d35fbf6b | 1879 | _cleanup_free_ char *line; |
81a2b7ce | 1880 | |
d35fbf6b DM |
1881 | line = exec_command_line(final_argv); |
1882 | if (line) { | |
1883 | log_open(); | |
f2341e0a LP |
1884 | log_struct(LOG_DEBUG, |
1885 | LOG_UNIT_ID(unit), | |
1886 | "EXECUTABLE=%s", command->path, | |
1887 | LOG_UNIT_MESSAGE(unit, "Executing: %s", line), | |
1888 | NULL); | |
d35fbf6b DM |
1889 | log_close(); |
1890 | } | |
1891 | } | |
dd305ec9 | 1892 | |
d35fbf6b | 1893 | execve(command->path, final_argv, final_env); |
ff0af2a1 | 1894 | *exit_status = EXIT_EXEC; |
d35fbf6b DM |
1895 | return -errno; |
1896 | } | |
81a2b7ce | 1897 | |
f2341e0a LP |
1898 | int exec_spawn(Unit *unit, |
1899 | ExecCommand *command, | |
d35fbf6b DM |
1900 | const ExecContext *context, |
1901 | const ExecParameters *params, | |
1902 | ExecRuntime *runtime, | |
1903 | pid_t *ret) { | |
8351ceae | 1904 | |
d35fbf6b DM |
1905 | _cleanup_strv_free_ char **files_env = NULL; |
1906 | int *fds = NULL; unsigned n_fds = 0; | |
ff0af2a1 LP |
1907 | _cleanup_free_ char *line = NULL; |
1908 | int socket_fd, r; | |
1909 | char **argv; | |
d35fbf6b | 1910 | pid_t pid; |
8351ceae | 1911 | |
f2341e0a | 1912 | assert(unit); |
d35fbf6b DM |
1913 | assert(command); |
1914 | assert(context); | |
1915 | assert(ret); | |
1916 | assert(params); | |
1917 | assert(params->fds || params->n_fds <= 0); | |
4298d0b5 | 1918 | |
d35fbf6b DM |
1919 | if (context->std_input == EXEC_INPUT_SOCKET || |
1920 | context->std_output == EXEC_OUTPUT_SOCKET || | |
1921 | context->std_error == EXEC_OUTPUT_SOCKET) { | |
17df7223 | 1922 | |
ff0af2a1 | 1923 | if (params->n_fds != 1) { |
f2341e0a | 1924 | log_unit_error(unit, "Got more than one socket."); |
d35fbf6b | 1925 | return -EINVAL; |
ff0af2a1 | 1926 | } |
eef65bf3 | 1927 | |
d35fbf6b DM |
1928 | socket_fd = params->fds[0]; |
1929 | } else { | |
1930 | socket_fd = -1; | |
1931 | fds = params->fds; | |
1932 | n_fds = params->n_fds; | |
1933 | } | |
94f04347 | 1934 | |
f2341e0a | 1935 | r = exec_context_load_environment(unit, context, &files_env); |
ff0af2a1 | 1936 | if (r < 0) |
f2341e0a | 1937 | return log_unit_error_errno(unit, r, "Failed to load environment files: %m"); |
034c6ed7 | 1938 | |
d35fbf6b | 1939 | argv = params->argv ?: command->argv; |
d35fbf6b DM |
1940 | line = exec_command_line(argv); |
1941 | if (!line) | |
1942 | return log_oom(); | |
fab56fc5 | 1943 | |
f2341e0a LP |
1944 | log_struct(LOG_DEBUG, |
1945 | LOG_UNIT_ID(unit), | |
1946 | LOG_UNIT_MESSAGE(unit, "About to execute: %s", line), | |
1947 | "EXECUTABLE=%s", command->path, | |
1948 | NULL); | |
d35fbf6b DM |
1949 | pid = fork(); |
1950 | if (pid < 0) | |
f2341e0a | 1951 | return log_unit_error_errno(unit, r, "Failed to fork: %m"); |
d35fbf6b DM |
1952 | |
1953 | if (pid == 0) { | |
ff0af2a1 LP |
1954 | int exit_status; |
1955 | ||
f2341e0a LP |
1956 | r = exec_child(unit, |
1957 | command, | |
ff0af2a1 LP |
1958 | context, |
1959 | params, | |
1960 | runtime, | |
1961 | argv, | |
1962 | socket_fd, | |
1963 | fds, n_fds, | |
1964 | files_env, | |
1965 | &exit_status); | |
1966 | if (r < 0) { | |
4c2630eb | 1967 | log_open(); |
f2341e0a LP |
1968 | log_struct_errno(LOG_ERR, r, |
1969 | LOG_MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED), | |
1970 | LOG_UNIT_ID(unit), | |
1971 | LOG_UNIT_MESSAGE(unit, "Failed at step %s spawning %s: %m", | |
1972 | exit_status_to_string(exit_status, EXIT_STATUS_SYSTEMD), | |
1973 | command->path), | |
1974 | "EXECUTABLE=%s", command->path, | |
1975 | NULL); | |
4c2630eb MS |
1976 | } |
1977 | ||
ff0af2a1 | 1978 | _exit(exit_status); |
034c6ed7 LP |
1979 | } |
1980 | ||
f2341e0a | 1981 | log_unit_debug(unit, "Forked %s as "PID_FMT, command->path, pid); |
23635a85 | 1982 | |
80876c20 LP |
1983 | /* We add the new process to the cgroup both in the child (so |
1984 | * that we can be sure that no user code is ever executed | |
1985 | * outside of the cgroup) and in the parent (so that we can be | |
1986 | * sure that when we kill the cgroup the process will be | |
1987 | * killed too). */ | |
d35fbf6b | 1988 | if (params->cgroup_path) |
dd305ec9 | 1989 | (void) cg_attach(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, pid); |
2da3263a | 1990 | |
b58b4116 | 1991 | exec_status_start(&command->exec_status, pid); |
9fb86720 | 1992 | |
034c6ed7 | 1993 | *ret = pid; |
5cb5a6ff LP |
1994 | return 0; |
1995 | } | |
1996 | ||
034c6ed7 LP |
1997 | void exec_context_init(ExecContext *c) { |
1998 | assert(c); | |
1999 | ||
4c12626c | 2000 | c->umask = 0022; |
9eba9da4 | 2001 | c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0); |
94f04347 | 2002 | c->cpu_sched_policy = SCHED_OTHER; |
071830ff | 2003 | c->syslog_priority = LOG_DAEMON|LOG_INFO; |
74922904 | 2004 | c->syslog_level_prefix = true; |
353e12c2 | 2005 | c->ignore_sigpipe = true; |
3a43da28 | 2006 | c->timer_slack_nsec = NSEC_INFINITY; |
050f7277 | 2007 | c->personality = PERSONALITY_INVALID; |
e66cf1a3 | 2008 | c->runtime_directory_mode = 0755; |
034c6ed7 LP |
2009 | } |
2010 | ||
613b411c | 2011 | void exec_context_done(ExecContext *c) { |
5cb5a6ff LP |
2012 | unsigned l; |
2013 | ||
2014 | assert(c); | |
2015 | ||
6796073e LP |
2016 | c->environment = strv_free(c->environment); |
2017 | c->environment_files = strv_free(c->environment_files); | |
8c7be95e | 2018 | |
1f6b4113 | 2019 | for (l = 0; l < ELEMENTSOF(c->rlimit); l++) |
a1e58e8e | 2020 | c->rlimit[l] = mfree(c->rlimit[l]); |
034c6ed7 | 2021 | |
a1e58e8e LP |
2022 | c->working_directory = mfree(c->working_directory); |
2023 | c->root_directory = mfree(c->root_directory); | |
2024 | c->tty_path = mfree(c->tty_path); | |
2025 | c->syslog_identifier = mfree(c->syslog_identifier); | |
2026 | c->user = mfree(c->user); | |
2027 | c->group = mfree(c->group); | |
034c6ed7 | 2028 | |
6796073e | 2029 | c->supplementary_groups = strv_free(c->supplementary_groups); |
94f04347 | 2030 | |
a1e58e8e | 2031 | c->pam_name = mfree(c->pam_name); |
5b6319dc | 2032 | |
94f04347 LP |
2033 | if (c->capabilities) { |
2034 | cap_free(c->capabilities); | |
2035 | c->capabilities = NULL; | |
2036 | } | |
15ae422b | 2037 | |
6796073e LP |
2038 | c->read_only_dirs = strv_free(c->read_only_dirs); |
2039 | c->read_write_dirs = strv_free(c->read_write_dirs); | |
2040 | c->inaccessible_dirs = strv_free(c->inaccessible_dirs); | |
82c121a4 LP |
2041 | |
2042 | if (c->cpuset) | |
2043 | CPU_FREE(c->cpuset); | |
86a3475b | 2044 | |
a1e58e8e LP |
2045 | c->utmp_id = mfree(c->utmp_id); |
2046 | c->selinux_context = mfree(c->selinux_context); | |
2047 | c->apparmor_profile = mfree(c->apparmor_profile); | |
eef65bf3 | 2048 | |
525d3cc7 LP |
2049 | c->syscall_filter = set_free(c->syscall_filter); |
2050 | c->syscall_archs = set_free(c->syscall_archs); | |
2051 | c->address_families = set_free(c->address_families); | |
e66cf1a3 | 2052 | |
6796073e | 2053 | c->runtime_directory = strv_free(c->runtime_directory); |
bb7dd0b0 DM |
2054 | |
2055 | bus_endpoint_free(c->bus_endpoint); | |
2056 | c->bus_endpoint = NULL; | |
e66cf1a3 LP |
2057 | } |
2058 | ||
2059 | int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) { | |
2060 | char **i; | |
2061 | ||
2062 | assert(c); | |
2063 | ||
2064 | if (!runtime_prefix) | |
2065 | return 0; | |
2066 | ||
2067 | STRV_FOREACH(i, c->runtime_directory) { | |
2068 | _cleanup_free_ char *p; | |
2069 | ||
2070 | p = strjoin(runtime_prefix, "/", *i, NULL); | |
2071 | if (!p) | |
2072 | return -ENOMEM; | |
2073 | ||
2074 | /* We execute this synchronously, since we need to be | |
2075 | * sure this is gone when we start the service | |
2076 | * next. */ | |
c6878637 | 2077 | (void) rm_rf(p, REMOVE_ROOT); |
e66cf1a3 LP |
2078 | } |
2079 | ||
2080 | return 0; | |
5cb5a6ff LP |
2081 | } |
2082 | ||
43d0fcbd LP |
2083 | void exec_command_done(ExecCommand *c) { |
2084 | assert(c); | |
2085 | ||
a1e58e8e | 2086 | c->path = mfree(c->path); |
43d0fcbd | 2087 | |
6796073e | 2088 | c->argv = strv_free(c->argv); |
43d0fcbd LP |
2089 | } |
2090 | ||
2091 | void exec_command_done_array(ExecCommand *c, unsigned n) { | |
2092 | unsigned i; | |
2093 | ||
2094 | for (i = 0; i < n; i++) | |
2095 | exec_command_done(c+i); | |
2096 | } | |
2097 | ||
f1acf85a | 2098 | ExecCommand* exec_command_free_list(ExecCommand *c) { |
5cb5a6ff LP |
2099 | ExecCommand *i; |
2100 | ||
2101 | while ((i = c)) { | |
71fda00f | 2102 | LIST_REMOVE(command, c, i); |
43d0fcbd | 2103 | exec_command_done(i); |
5cb5a6ff LP |
2104 | free(i); |
2105 | } | |
f1acf85a ZJS |
2106 | |
2107 | return NULL; | |
5cb5a6ff LP |
2108 | } |
2109 | ||
034c6ed7 LP |
2110 | void exec_command_free_array(ExecCommand **c, unsigned n) { |
2111 | unsigned i; | |
2112 | ||
f1acf85a ZJS |
2113 | for (i = 0; i < n; i++) |
2114 | c[i] = exec_command_free_list(c[i]); | |
034c6ed7 LP |
2115 | } |
2116 | ||
039f0e70 | 2117 | typedef struct InvalidEnvInfo { |
f2341e0a | 2118 | Unit *unit; |
039f0e70 LP |
2119 | const char *path; |
2120 | } InvalidEnvInfo; | |
2121 | ||
2122 | static void invalid_env(const char *p, void *userdata) { | |
2123 | InvalidEnvInfo *info = userdata; | |
2124 | ||
f2341e0a | 2125 | log_unit_error(info->unit, "Ignoring invalid environment assignment '%s': %s", p, info->path); |
039f0e70 LP |
2126 | } |
2127 | ||
f2341e0a | 2128 | int exec_context_load_environment(Unit *unit, const ExecContext *c, char ***l) { |
8c7be95e LP |
2129 | char **i, **r = NULL; |
2130 | ||
2131 | assert(c); | |
2132 | assert(l); | |
2133 | ||
2134 | STRV_FOREACH(i, c->environment_files) { | |
2135 | char *fn; | |
2136 | int k; | |
2137 | bool ignore = false; | |
2138 | char **p; | |
7fd1b19b | 2139 | _cleanup_globfree_ glob_t pglob = {}; |
2bef10ab | 2140 | int count, n; |
8c7be95e LP |
2141 | |
2142 | fn = *i; | |
2143 | ||
2144 | if (fn[0] == '-') { | |
2145 | ignore = true; | |
2146 | fn ++; | |
2147 | } | |
2148 | ||
2149 | if (!path_is_absolute(fn)) { | |
8c7be95e LP |
2150 | if (ignore) |
2151 | continue; | |
2152 | ||
2153 | strv_free(r); | |
2154 | return -EINVAL; | |
2155 | } | |
2156 | ||
2bef10ab | 2157 | /* Filename supports globbing, take all matching files */ |
2bef10ab PL |
2158 | errno = 0; |
2159 | if (glob(fn, 0, NULL, &pglob) != 0) { | |
2bef10ab PL |
2160 | if (ignore) |
2161 | continue; | |
8c7be95e | 2162 | |
2bef10ab PL |
2163 | strv_free(r); |
2164 | return errno ? -errno : -EINVAL; | |
2165 | } | |
2166 | count = pglob.gl_pathc; | |
2167 | if (count == 0) { | |
8c7be95e LP |
2168 | if (ignore) |
2169 | continue; | |
2170 | ||
2171 | strv_free(r); | |
2bef10ab | 2172 | return -EINVAL; |
8c7be95e | 2173 | } |
2bef10ab | 2174 | for (n = 0; n < count; n++) { |
717603e3 | 2175 | k = load_env_file(NULL, pglob.gl_pathv[n], NULL, &p); |
2bef10ab PL |
2176 | if (k < 0) { |
2177 | if (ignore) | |
2178 | continue; | |
8c7be95e | 2179 | |
2bef10ab | 2180 | strv_free(r); |
2bef10ab | 2181 | return k; |
e9c1ea9d | 2182 | } |
ebc05a09 | 2183 | /* Log invalid environment variables with filename */ |
039f0e70 LP |
2184 | if (p) { |
2185 | InvalidEnvInfo info = { | |
f2341e0a | 2186 | .unit = unit, |
039f0e70 LP |
2187 | .path = pglob.gl_pathv[n] |
2188 | }; | |
2189 | ||
2190 | p = strv_env_clean_with_callback(p, invalid_env, &info); | |
2191 | } | |
8c7be95e | 2192 | |
2bef10ab PL |
2193 | if (r == NULL) |
2194 | r = p; | |
2195 | else { | |
2196 | char **m; | |
8c7be95e | 2197 | |
2bef10ab PL |
2198 | m = strv_env_merge(2, r, p); |
2199 | strv_free(r); | |
2200 | strv_free(p); | |
c84a9488 | 2201 | if (!m) |
2bef10ab | 2202 | return -ENOMEM; |
2bef10ab PL |
2203 | |
2204 | r = m; | |
2205 | } | |
8c7be95e LP |
2206 | } |
2207 | } | |
2208 | ||
2209 | *l = r; | |
2210 | ||
2211 | return 0; | |
2212 | } | |
2213 | ||
6ac8fdc9 | 2214 | static bool tty_may_match_dev_console(const char *tty) { |
e1d75803 | 2215 | _cleanup_free_ char *active = NULL; |
7d6884b6 | 2216 | char *console; |
6ac8fdc9 MS |
2217 | |
2218 | if (startswith(tty, "/dev/")) | |
2219 | tty += 5; | |
2220 | ||
2221 | /* trivial identity? */ | |
2222 | if (streq(tty, "console")) | |
2223 | return true; | |
2224 | ||
2225 | console = resolve_dev_console(&active); | |
2226 | /* if we could not resolve, assume it may */ | |
2227 | if (!console) | |
2228 | return true; | |
2229 | ||
2230 | /* "tty0" means the active VC, so it may be the same sometimes */ | |
e1d75803 | 2231 | return streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty)); |
6ac8fdc9 MS |
2232 | } |
2233 | ||
2234 | bool exec_context_may_touch_console(ExecContext *ec) { | |
2235 | return (ec->tty_reset || ec->tty_vhangup || ec->tty_vt_disallocate || | |
2236 | is_terminal_input(ec->std_input) || | |
2237 | is_terminal_output(ec->std_output) || | |
2238 | is_terminal_output(ec->std_error)) && | |
2239 | tty_may_match_dev_console(tty_path(ec)); | |
2240 | } | |
2241 | ||
15ae422b LP |
2242 | static void strv_fprintf(FILE *f, char **l) { |
2243 | char **g; | |
2244 | ||
2245 | assert(f); | |
2246 | ||
2247 | STRV_FOREACH(g, l) | |
2248 | fprintf(f, " %s", *g); | |
2249 | } | |
2250 | ||
5cb5a6ff | 2251 | void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { |
507f22bd | 2252 | char **e; |
94f04347 | 2253 | unsigned i; |
9eba9da4 | 2254 | |
5cb5a6ff LP |
2255 | assert(c); |
2256 | assert(f); | |
2257 | ||
4ad49000 | 2258 | prefix = strempty(prefix); |
5cb5a6ff LP |
2259 | |
2260 | fprintf(f, | |
94f04347 LP |
2261 | "%sUMask: %04o\n" |
2262 | "%sWorkingDirectory: %s\n" | |
451a074f | 2263 | "%sRootDirectory: %s\n" |
15ae422b | 2264 | "%sNonBlocking: %s\n" |
64747e2d | 2265 | "%sPrivateTmp: %s\n" |
4819ff03 | 2266 | "%sPrivateNetwork: %s\n" |
7f112f50 | 2267 | "%sPrivateDevices: %s\n" |
1b8689f9 LP |
2268 | "%sProtectHome: %s\n" |
2269 | "%sProtectSystem: %s\n" | |
3bb07b76 | 2270 | "%sIgnoreSIGPIPE: %s\n", |
5cb5a6ff | 2271 | prefix, c->umask, |
9eba9da4 | 2272 | prefix, c->working_directory ? c->working_directory : "/", |
451a074f | 2273 | prefix, c->root_directory ? c->root_directory : "/", |
15ae422b | 2274 | prefix, yes_no(c->non_blocking), |
64747e2d | 2275 | prefix, yes_no(c->private_tmp), |
4819ff03 | 2276 | prefix, yes_no(c->private_network), |
7f112f50 | 2277 | prefix, yes_no(c->private_devices), |
1b8689f9 LP |
2278 | prefix, protect_home_to_string(c->protect_home), |
2279 | prefix, protect_system_to_string(c->protect_system), | |
3bb07b76 | 2280 | prefix, yes_no(c->ignore_sigpipe)); |
fb33a393 | 2281 | |
8c7be95e LP |
2282 | STRV_FOREACH(e, c->environment) |
2283 | fprintf(f, "%sEnvironment: %s\n", prefix, *e); | |
2284 | ||
2285 | STRV_FOREACH(e, c->environment_files) | |
2286 | fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e); | |
94f04347 | 2287 | |
fb33a393 LP |
2288 | if (c->nice_set) |
2289 | fprintf(f, | |
2290 | "%sNice: %i\n", | |
2291 | prefix, c->nice); | |
2292 | ||
dd6c17b1 | 2293 | if (c->oom_score_adjust_set) |
fb33a393 | 2294 | fprintf(f, |
dd6c17b1 LP |
2295 | "%sOOMScoreAdjust: %i\n", |
2296 | prefix, c->oom_score_adjust); | |
9eba9da4 | 2297 | |
94f04347 LP |
2298 | for (i = 0; i < RLIM_NLIMITS; i++) |
2299 | if (c->rlimit[i]) | |
de0671ee ZJS |
2300 | fprintf(f, "%s%s: "RLIM_FMT"\n", |
2301 | prefix, rlimit_to_string(i), c->rlimit[i]->rlim_max); | |
94f04347 | 2302 | |
f8b69d1d | 2303 | if (c->ioprio_set) { |
1756a011 | 2304 | _cleanup_free_ char *class_str = NULL; |
f8b69d1d | 2305 | |
1756a011 | 2306 | ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str); |
9eba9da4 LP |
2307 | fprintf(f, |
2308 | "%sIOSchedulingClass: %s\n" | |
2309 | "%sIOPriority: %i\n", | |
f8b69d1d | 2310 | prefix, strna(class_str), |
9eba9da4 | 2311 | prefix, (int) IOPRIO_PRIO_DATA(c->ioprio)); |
f8b69d1d | 2312 | } |
94f04347 | 2313 | |
f8b69d1d | 2314 | if (c->cpu_sched_set) { |
1756a011 | 2315 | _cleanup_free_ char *policy_str = NULL; |
f8b69d1d | 2316 | |
1756a011 | 2317 | sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str); |
94f04347 LP |
2318 | fprintf(f, |
2319 | "%sCPUSchedulingPolicy: %s\n" | |
38b48754 LP |
2320 | "%sCPUSchedulingPriority: %i\n" |
2321 | "%sCPUSchedulingResetOnFork: %s\n", | |
f8b69d1d | 2322 | prefix, strna(policy_str), |
38b48754 LP |
2323 | prefix, c->cpu_sched_priority, |
2324 | prefix, yes_no(c->cpu_sched_reset_on_fork)); | |
b929bf04 | 2325 | } |
94f04347 | 2326 | |
82c121a4 | 2327 | if (c->cpuset) { |
94f04347 | 2328 | fprintf(f, "%sCPUAffinity:", prefix); |
82c121a4 LP |
2329 | for (i = 0; i < c->cpuset_ncpus; i++) |
2330 | if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset)) | |
43a99a7a | 2331 | fprintf(f, " %u", i); |
94f04347 LP |
2332 | fputs("\n", f); |
2333 | } | |
2334 | ||
3a43da28 | 2335 | if (c->timer_slack_nsec != NSEC_INFINITY) |
ccd06097 | 2336 | fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec); |
94f04347 LP |
2337 | |
2338 | fprintf(f, | |
80876c20 LP |
2339 | "%sStandardInput: %s\n" |
2340 | "%sStandardOutput: %s\n" | |
2341 | "%sStandardError: %s\n", | |
2342 | prefix, exec_input_to_string(c->std_input), | |
2343 | prefix, exec_output_to_string(c->std_output), | |
2344 | prefix, exec_output_to_string(c->std_error)); | |
2345 | ||
2346 | if (c->tty_path) | |
2347 | fprintf(f, | |
6ea832a2 LP |
2348 | "%sTTYPath: %s\n" |
2349 | "%sTTYReset: %s\n" | |
2350 | "%sTTYVHangup: %s\n" | |
2351 | "%sTTYVTDisallocate: %s\n", | |
2352 | prefix, c->tty_path, | |
2353 | prefix, yes_no(c->tty_reset), | |
2354 | prefix, yes_no(c->tty_vhangup), | |
2355 | prefix, yes_no(c->tty_vt_disallocate)); | |
94f04347 | 2356 | |
5ce70e5b ZJS |
2357 | if (c->std_output == EXEC_OUTPUT_SYSLOG || |
2358 | c->std_output == EXEC_OUTPUT_KMSG || | |
2359 | c->std_output == EXEC_OUTPUT_JOURNAL || | |
2360 | c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
2361 | c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
2362 | c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE || | |
2363 | c->std_error == EXEC_OUTPUT_SYSLOG || | |
2364 | c->std_error == EXEC_OUTPUT_KMSG || | |
2365 | c->std_error == EXEC_OUTPUT_JOURNAL || | |
2366 | c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
2367 | c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
2368 | c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) { | |
f8b69d1d | 2369 | |
5ce70e5b | 2370 | _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL; |
f8b69d1d | 2371 | |
5ce70e5b ZJS |
2372 | log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str); |
2373 | log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str); | |
f8b69d1d | 2374 | |
94f04347 LP |
2375 | fprintf(f, |
2376 | "%sSyslogFacility: %s\n" | |
2377 | "%sSyslogLevel: %s\n", | |
f8b69d1d MS |
2378 | prefix, strna(fac_str), |
2379 | prefix, strna(lvl_str)); | |
f8b69d1d | 2380 | } |
94f04347 LP |
2381 | |
2382 | if (c->capabilities) { | |
5ce70e5b ZJS |
2383 | _cleanup_cap_free_charp_ char *t; |
2384 | ||
2385 | t = cap_to_text(c->capabilities, NULL); | |
2386 | if (t) | |
2387 | fprintf(f, "%sCapabilities: %s\n", prefix, t); | |
94f04347 LP |
2388 | } |
2389 | ||
2390 | if (c->secure_bits) | |
2391 | fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n", | |
2392 | prefix, | |
cbb21cca ZJS |
2393 | (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "", |
2394 | (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "", | |
2395 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "", | |
2396 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "", | |
2397 | (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "", | |
2398 | (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : ""); | |
94f04347 LP |
2399 | |
2400 | if (c->capability_bounding_set_drop) { | |
ae556c21 | 2401 | unsigned long l; |
260abb78 | 2402 | fprintf(f, "%sCapabilityBoundingSet:", prefix); |
94f04347 | 2403 | |
64685e0c | 2404 | for (l = 0; l <= cap_last_cap(); l++) |
2822da4f LP |
2405 | if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) |
2406 | fprintf(f, " %s", strna(capability_to_name(l))); | |
94f04347 LP |
2407 | |
2408 | fputs("\n", f); | |
2409 | } | |
2410 | ||
2411 | if (c->user) | |
f2d3769a | 2412 | fprintf(f, "%sUser: %s\n", prefix, c->user); |
94f04347 | 2413 | if (c->group) |
f2d3769a | 2414 | fprintf(f, "%sGroup: %s\n", prefix, c->group); |
94f04347 | 2415 | |
15ae422b | 2416 | if (strv_length(c->supplementary_groups) > 0) { |
94f04347 | 2417 | fprintf(f, "%sSupplementaryGroups:", prefix); |
15ae422b LP |
2418 | strv_fprintf(f, c->supplementary_groups); |
2419 | fputs("\n", f); | |
2420 | } | |
94f04347 | 2421 | |
5b6319dc | 2422 | if (c->pam_name) |
f2d3769a | 2423 | fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name); |
5b6319dc | 2424 | |
15ae422b LP |
2425 | if (strv_length(c->read_write_dirs) > 0) { |
2426 | fprintf(f, "%sReadWriteDirs:", prefix); | |
2427 | strv_fprintf(f, c->read_write_dirs); | |
2428 | fputs("\n", f); | |
2429 | } | |
2430 | ||
2431 | if (strv_length(c->read_only_dirs) > 0) { | |
2432 | fprintf(f, "%sReadOnlyDirs:", prefix); | |
2433 | strv_fprintf(f, c->read_only_dirs); | |
2434 | fputs("\n", f); | |
2435 | } | |
94f04347 | 2436 | |
15ae422b LP |
2437 | if (strv_length(c->inaccessible_dirs) > 0) { |
2438 | fprintf(f, "%sInaccessibleDirs:", prefix); | |
2439 | strv_fprintf(f, c->inaccessible_dirs); | |
94f04347 LP |
2440 | fputs("\n", f); |
2441 | } | |
2e22afe9 | 2442 | |
169c1bda LP |
2443 | if (c->utmp_id) |
2444 | fprintf(f, | |
2445 | "%sUtmpIdentifier: %s\n", | |
2446 | prefix, c->utmp_id); | |
7b52a628 MS |
2447 | |
2448 | if (c->selinux_context) | |
2449 | fprintf(f, | |
5f8640fb LP |
2450 | "%sSELinuxContext: %s%s\n", |
2451 | prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context); | |
17df7223 | 2452 | |
050f7277 | 2453 | if (c->personality != PERSONALITY_INVALID) |
ac45f971 LP |
2454 | fprintf(f, |
2455 | "%sPersonality: %s\n", | |
2456 | prefix, strna(personality_to_string(c->personality))); | |
2457 | ||
17df7223 | 2458 | if (c->syscall_filter) { |
351a19b1 | 2459 | #ifdef HAVE_SECCOMP |
17df7223 LP |
2460 | Iterator j; |
2461 | void *id; | |
2462 | bool first = true; | |
351a19b1 | 2463 | #endif |
17df7223 LP |
2464 | |
2465 | fprintf(f, | |
57183d11 | 2466 | "%sSystemCallFilter: ", |
17df7223 LP |
2467 | prefix); |
2468 | ||
2469 | if (!c->syscall_whitelist) | |
2470 | fputc('~', f); | |
2471 | ||
351a19b1 | 2472 | #ifdef HAVE_SECCOMP |
17df7223 LP |
2473 | SET_FOREACH(id, c->syscall_filter, j) { |
2474 | _cleanup_free_ char *name = NULL; | |
2475 | ||
2476 | if (first) | |
2477 | first = false; | |
2478 | else | |
2479 | fputc(' ', f); | |
2480 | ||
57183d11 | 2481 | name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1); |
17df7223 LP |
2482 | fputs(strna(name), f); |
2483 | } | |
351a19b1 | 2484 | #endif |
17df7223 LP |
2485 | |
2486 | fputc('\n', f); | |
2487 | } | |
2488 | ||
57183d11 LP |
2489 | if (c->syscall_archs) { |
2490 | #ifdef HAVE_SECCOMP | |
2491 | Iterator j; | |
2492 | void *id; | |
2493 | #endif | |
2494 | ||
2495 | fprintf(f, | |
2496 | "%sSystemCallArchitectures:", | |
2497 | prefix); | |
2498 | ||
2499 | #ifdef HAVE_SECCOMP | |
2500 | SET_FOREACH(id, c->syscall_archs, j) | |
2501 | fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1))); | |
2502 | #endif | |
2503 | fputc('\n', f); | |
2504 | } | |
2505 | ||
17df7223 LP |
2506 | if (c->syscall_errno != 0) |
2507 | fprintf(f, | |
2508 | "%sSystemCallErrorNumber: %s\n", | |
2509 | prefix, strna(errno_to_name(c->syscall_errno))); | |
eef65bf3 MS |
2510 | |
2511 | if (c->apparmor_profile) | |
2512 | fprintf(f, | |
2513 | "%sAppArmorProfile: %s%s\n", | |
2514 | prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile); | |
5cb5a6ff LP |
2515 | } |
2516 | ||
a931ad47 LP |
2517 | bool exec_context_maintains_privileges(ExecContext *c) { |
2518 | assert(c); | |
2519 | ||
2520 | /* Returns true if the process forked off would run run under | |
2521 | * an unchanged UID or as root. */ | |
2522 | ||
2523 | if (!c->user) | |
2524 | return true; | |
2525 | ||
2526 | if (streq(c->user, "root") || streq(c->user, "0")) | |
2527 | return true; | |
2528 | ||
2529 | return false; | |
2530 | } | |
2531 | ||
b58b4116 | 2532 | void exec_status_start(ExecStatus *s, pid_t pid) { |
034c6ed7 | 2533 | assert(s); |
5cb5a6ff | 2534 | |
b58b4116 LP |
2535 | zero(*s); |
2536 | s->pid = pid; | |
2537 | dual_timestamp_get(&s->start_timestamp); | |
2538 | } | |
2539 | ||
6ea832a2 | 2540 | void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) { |
b58b4116 LP |
2541 | assert(s); |
2542 | ||
0b1f4ae6 | 2543 | if (s->pid && s->pid != pid) |
b58b4116 LP |
2544 | zero(*s); |
2545 | ||
034c6ed7 | 2546 | s->pid = pid; |
63983207 | 2547 | dual_timestamp_get(&s->exit_timestamp); |
9fb86720 | 2548 | |
034c6ed7 LP |
2549 | s->code = code; |
2550 | s->status = status; | |
169c1bda | 2551 | |
6ea832a2 LP |
2552 | if (context) { |
2553 | if (context->utmp_id) | |
2554 | utmp_put_dead_process(context->utmp_id, pid, code, status); | |
2555 | ||
2556 | exec_context_tty_reset(context); | |
2557 | } | |
9fb86720 LP |
2558 | } |
2559 | ||
2560 | void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) { | |
2561 | char buf[FORMAT_TIMESTAMP_MAX]; | |
2562 | ||
2563 | assert(s); | |
2564 | assert(f); | |
2565 | ||
9fb86720 LP |
2566 | if (s->pid <= 0) |
2567 | return; | |
2568 | ||
4c940960 LP |
2569 | prefix = strempty(prefix); |
2570 | ||
9fb86720 | 2571 | fprintf(f, |
ccd06097 ZJS |
2572 | "%sPID: "PID_FMT"\n", |
2573 | prefix, s->pid); | |
9fb86720 | 2574 | |
63983207 | 2575 | if (s->start_timestamp.realtime > 0) |
9fb86720 LP |
2576 | fprintf(f, |
2577 | "%sStart Timestamp: %s\n", | |
63983207 | 2578 | prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime)); |
9fb86720 | 2579 | |
63983207 | 2580 | if (s->exit_timestamp.realtime > 0) |
9fb86720 LP |
2581 | fprintf(f, |
2582 | "%sExit Timestamp: %s\n" | |
2583 | "%sExit Code: %s\n" | |
2584 | "%sExit Status: %i\n", | |
63983207 | 2585 | prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime), |
9fb86720 LP |
2586 | prefix, sigchld_code_to_string(s->code), |
2587 | prefix, s->status); | |
5cb5a6ff | 2588 | } |
44d8db9e | 2589 | |
9e2f7c11 | 2590 | char *exec_command_line(char **argv) { |
44d8db9e LP |
2591 | size_t k; |
2592 | char *n, *p, **a; | |
2593 | bool first = true; | |
2594 | ||
9e2f7c11 | 2595 | assert(argv); |
44d8db9e | 2596 | |
9164977d | 2597 | k = 1; |
9e2f7c11 | 2598 | STRV_FOREACH(a, argv) |
44d8db9e LP |
2599 | k += strlen(*a)+3; |
2600 | ||
2601 | if (!(n = new(char, k))) | |
2602 | return NULL; | |
2603 | ||
2604 | p = n; | |
9e2f7c11 | 2605 | STRV_FOREACH(a, argv) { |
44d8db9e LP |
2606 | |
2607 | if (!first) | |
2608 | *(p++) = ' '; | |
2609 | else | |
2610 | first = false; | |
2611 | ||
2612 | if (strpbrk(*a, WHITESPACE)) { | |
2613 | *(p++) = '\''; | |
2614 | p = stpcpy(p, *a); | |
2615 | *(p++) = '\''; | |
2616 | } else | |
2617 | p = stpcpy(p, *a); | |
2618 | ||
2619 | } | |
2620 | ||
9164977d LP |
2621 | *p = 0; |
2622 | ||
44d8db9e LP |
2623 | /* FIXME: this doesn't really handle arguments that have |
2624 | * spaces and ticks in them */ | |
2625 | ||
2626 | return n; | |
2627 | } | |
2628 | ||
2629 | void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) { | |
e1d75803 | 2630 | _cleanup_free_ char *cmd = NULL; |
4c940960 | 2631 | const char *prefix2; |
44d8db9e LP |
2632 | |
2633 | assert(c); | |
2634 | assert(f); | |
2635 | ||
4c940960 | 2636 | prefix = strempty(prefix); |
63c372cb | 2637 | prefix2 = strjoina(prefix, "\t"); |
44d8db9e | 2638 | |
9e2f7c11 | 2639 | cmd = exec_command_line(c->argv); |
44d8db9e LP |
2640 | fprintf(f, |
2641 | "%sCommand Line: %s\n", | |
2642 | prefix, cmd ? cmd : strerror(ENOMEM)); | |
2643 | ||
9fb86720 | 2644 | exec_status_dump(&c->exec_status, f, prefix2); |
44d8db9e LP |
2645 | } |
2646 | ||
2647 | void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) { | |
2648 | assert(f); | |
2649 | ||
4c940960 | 2650 | prefix = strempty(prefix); |
44d8db9e LP |
2651 | |
2652 | LIST_FOREACH(command, c, c) | |
2653 | exec_command_dump(c, f, prefix); | |
2654 | } | |
94f04347 | 2655 | |
a6a80b4f LP |
2656 | void exec_command_append_list(ExecCommand **l, ExecCommand *e) { |
2657 | ExecCommand *end; | |
2658 | ||
2659 | assert(l); | |
2660 | assert(e); | |
2661 | ||
2662 | if (*l) { | |
35b8ca3a | 2663 | /* It's kind of important, that we keep the order here */ |
71fda00f LP |
2664 | LIST_FIND_TAIL(command, *l, end); |
2665 | LIST_INSERT_AFTER(command, *l, end, e); | |
a6a80b4f LP |
2666 | } else |
2667 | *l = e; | |
2668 | } | |
2669 | ||
26fd040d LP |
2670 | int exec_command_set(ExecCommand *c, const char *path, ...) { |
2671 | va_list ap; | |
2672 | char **l, *p; | |
2673 | ||
2674 | assert(c); | |
2675 | assert(path); | |
2676 | ||
2677 | va_start(ap, path); | |
2678 | l = strv_new_ap(path, ap); | |
2679 | va_end(ap); | |
2680 | ||
2681 | if (!l) | |
2682 | return -ENOMEM; | |
2683 | ||
250a918d LP |
2684 | p = strdup(path); |
2685 | if (!p) { | |
26fd040d LP |
2686 | strv_free(l); |
2687 | return -ENOMEM; | |
2688 | } | |
2689 | ||
2690 | free(c->path); | |
2691 | c->path = p; | |
2692 | ||
2693 | strv_free(c->argv); | |
2694 | c->argv = l; | |
2695 | ||
2696 | return 0; | |
2697 | } | |
2698 | ||
86b23b07 | 2699 | int exec_command_append(ExecCommand *c, const char *path, ...) { |
e63ff941 | 2700 | _cleanup_strv_free_ char **l = NULL; |
86b23b07 | 2701 | va_list ap; |
86b23b07 JS |
2702 | int r; |
2703 | ||
2704 | assert(c); | |
2705 | assert(path); | |
2706 | ||
2707 | va_start(ap, path); | |
2708 | l = strv_new_ap(path, ap); | |
2709 | va_end(ap); | |
2710 | ||
2711 | if (!l) | |
2712 | return -ENOMEM; | |
2713 | ||
2714 | r = strv_extend_strv(&c->argv, l); | |
e63ff941 | 2715 | if (r < 0) |
86b23b07 | 2716 | return r; |
86b23b07 JS |
2717 | |
2718 | return 0; | |
2719 | } | |
2720 | ||
2721 | ||
613b411c LP |
2722 | static int exec_runtime_allocate(ExecRuntime **rt) { |
2723 | ||
2724 | if (*rt) | |
2725 | return 0; | |
2726 | ||
2727 | *rt = new0(ExecRuntime, 1); | |
f146f5e1 | 2728 | if (!*rt) |
613b411c LP |
2729 | return -ENOMEM; |
2730 | ||
2731 | (*rt)->n_ref = 1; | |
2732 | (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1; | |
2733 | ||
2734 | return 0; | |
2735 | } | |
2736 | ||
2737 | int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) { | |
2738 | int r; | |
2739 | ||
2740 | assert(rt); | |
2741 | assert(c); | |
2742 | assert(id); | |
2743 | ||
2744 | if (*rt) | |
2745 | return 1; | |
2746 | ||
2747 | if (!c->private_network && !c->private_tmp) | |
2748 | return 0; | |
2749 | ||
2750 | r = exec_runtime_allocate(rt); | |
2751 | if (r < 0) | |
2752 | return r; | |
2753 | ||
2754 | if (c->private_network && (*rt)->netns_storage_socket[0] < 0) { | |
2755 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, (*rt)->netns_storage_socket) < 0) | |
2756 | return -errno; | |
2757 | } | |
2758 | ||
2759 | if (c->private_tmp && !(*rt)->tmp_dir) { | |
2760 | r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir); | |
2761 | if (r < 0) | |
2762 | return r; | |
2763 | } | |
2764 | ||
2765 | return 1; | |
2766 | } | |
2767 | ||
2768 | ExecRuntime *exec_runtime_ref(ExecRuntime *r) { | |
2769 | assert(r); | |
2770 | assert(r->n_ref > 0); | |
2771 | ||
2772 | r->n_ref++; | |
2773 | return r; | |
2774 | } | |
2775 | ||
2776 | ExecRuntime *exec_runtime_unref(ExecRuntime *r) { | |
2777 | ||
2778 | if (!r) | |
2779 | return NULL; | |
2780 | ||
2781 | assert(r->n_ref > 0); | |
2782 | ||
2783 | r->n_ref--; | |
f2341e0a LP |
2784 | if (r->n_ref > 0) |
2785 | return NULL; | |
2786 | ||
2787 | free(r->tmp_dir); | |
2788 | free(r->var_tmp_dir); | |
2789 | safe_close_pair(r->netns_storage_socket); | |
2790 | free(r); | |
613b411c LP |
2791 | |
2792 | return NULL; | |
2793 | } | |
2794 | ||
f2341e0a | 2795 | int exec_runtime_serialize(Unit *u, ExecRuntime *rt, FILE *f, FDSet *fds) { |
613b411c LP |
2796 | assert(u); |
2797 | assert(f); | |
2798 | assert(fds); | |
2799 | ||
2800 | if (!rt) | |
2801 | return 0; | |
2802 | ||
2803 | if (rt->tmp_dir) | |
2804 | unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir); | |
2805 | ||
2806 | if (rt->var_tmp_dir) | |
2807 | unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir); | |
2808 | ||
2809 | if (rt->netns_storage_socket[0] >= 0) { | |
2810 | int copy; | |
2811 | ||
2812 | copy = fdset_put_dup(fds, rt->netns_storage_socket[0]); | |
2813 | if (copy < 0) | |
2814 | return copy; | |
2815 | ||
2816 | unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy); | |
2817 | } | |
2818 | ||
2819 | if (rt->netns_storage_socket[1] >= 0) { | |
2820 | int copy; | |
2821 | ||
2822 | copy = fdset_put_dup(fds, rt->netns_storage_socket[1]); | |
2823 | if (copy < 0) | |
2824 | return copy; | |
2825 | ||
2826 | unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy); | |
2827 | } | |
2828 | ||
2829 | return 0; | |
2830 | } | |
2831 | ||
f2341e0a | 2832 | int exec_runtime_deserialize_item(Unit *u, ExecRuntime **rt, const char *key, const char *value, FDSet *fds) { |
613b411c LP |
2833 | int r; |
2834 | ||
2835 | assert(rt); | |
2836 | assert(key); | |
2837 | assert(value); | |
2838 | ||
2839 | if (streq(key, "tmp-dir")) { | |
2840 | char *copy; | |
2841 | ||
2842 | r = exec_runtime_allocate(rt); | |
2843 | if (r < 0) | |
f2341e0a | 2844 | return log_oom(); |
613b411c LP |
2845 | |
2846 | copy = strdup(value); | |
2847 | if (!copy) | |
2848 | return log_oom(); | |
2849 | ||
2850 | free((*rt)->tmp_dir); | |
2851 | (*rt)->tmp_dir = copy; | |
2852 | ||
2853 | } else if (streq(key, "var-tmp-dir")) { | |
2854 | char *copy; | |
2855 | ||
2856 | r = exec_runtime_allocate(rt); | |
2857 | if (r < 0) | |
f2341e0a | 2858 | return log_oom(); |
613b411c LP |
2859 | |
2860 | copy = strdup(value); | |
2861 | if (!copy) | |
2862 | return log_oom(); | |
2863 | ||
2864 | free((*rt)->var_tmp_dir); | |
2865 | (*rt)->var_tmp_dir = copy; | |
2866 | ||
2867 | } else if (streq(key, "netns-socket-0")) { | |
2868 | int fd; | |
2869 | ||
2870 | r = exec_runtime_allocate(rt); | |
2871 | if (r < 0) | |
f2341e0a | 2872 | return log_oom(); |
613b411c LP |
2873 | |
2874 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 2875 | log_unit_debug(u, "Failed to parse netns socket value: %s", value); |
613b411c | 2876 | else { |
03e334a1 | 2877 | safe_close((*rt)->netns_storage_socket[0]); |
613b411c LP |
2878 | (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd); |
2879 | } | |
2880 | } else if (streq(key, "netns-socket-1")) { | |
2881 | int fd; | |
2882 | ||
2883 | r = exec_runtime_allocate(rt); | |
2884 | if (r < 0) | |
f2341e0a | 2885 | return log_oom(); |
613b411c LP |
2886 | |
2887 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 2888 | log_unit_debug(u, "Failed to parse netns socket value: %s", value); |
613b411c | 2889 | else { |
03e334a1 | 2890 | safe_close((*rt)->netns_storage_socket[1]); |
613b411c LP |
2891 | (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd); |
2892 | } | |
2893 | } else | |
2894 | return 0; | |
2895 | ||
2896 | return 1; | |
2897 | } | |
2898 | ||
2899 | static void *remove_tmpdir_thread(void *p) { | |
2900 | _cleanup_free_ char *path = p; | |
2901 | ||
c6878637 | 2902 | (void) rm_rf(path, REMOVE_ROOT|REMOVE_PHYSICAL); |
613b411c LP |
2903 | return NULL; |
2904 | } | |
2905 | ||
2906 | void exec_runtime_destroy(ExecRuntime *rt) { | |
98b47d54 LP |
2907 | int r; |
2908 | ||
613b411c LP |
2909 | if (!rt) |
2910 | return; | |
2911 | ||
2912 | /* If there are multiple users of this, let's leave the stuff around */ | |
2913 | if (rt->n_ref > 1) | |
2914 | return; | |
2915 | ||
2916 | if (rt->tmp_dir) { | |
2917 | log_debug("Spawning thread to nuke %s", rt->tmp_dir); | |
98b47d54 LP |
2918 | |
2919 | r = asynchronous_job(remove_tmpdir_thread, rt->tmp_dir); | |
2920 | if (r < 0) { | |
da927ba9 | 2921 | log_warning_errno(r, "Failed to nuke %s: %m", rt->tmp_dir); |
98b47d54 LP |
2922 | free(rt->tmp_dir); |
2923 | } | |
2924 | ||
613b411c LP |
2925 | rt->tmp_dir = NULL; |
2926 | } | |
2927 | ||
2928 | if (rt->var_tmp_dir) { | |
2929 | log_debug("Spawning thread to nuke %s", rt->var_tmp_dir); | |
98b47d54 LP |
2930 | |
2931 | r = asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir); | |
2932 | if (r < 0) { | |
da927ba9 | 2933 | log_warning_errno(r, "Failed to nuke %s: %m", rt->var_tmp_dir); |
98b47d54 LP |
2934 | free(rt->var_tmp_dir); |
2935 | } | |
2936 | ||
613b411c LP |
2937 | rt->var_tmp_dir = NULL; |
2938 | } | |
2939 | ||
3d94f76c | 2940 | safe_close_pair(rt->netns_storage_socket); |
613b411c LP |
2941 | } |
2942 | ||
80876c20 LP |
2943 | static const char* const exec_input_table[_EXEC_INPUT_MAX] = { |
2944 | [EXEC_INPUT_NULL] = "null", | |
2945 | [EXEC_INPUT_TTY] = "tty", | |
2946 | [EXEC_INPUT_TTY_FORCE] = "tty-force", | |
4f2d528d LP |
2947 | [EXEC_INPUT_TTY_FAIL] = "tty-fail", |
2948 | [EXEC_INPUT_SOCKET] = "socket" | |
80876c20 LP |
2949 | }; |
2950 | ||
8a0867d6 LP |
2951 | DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput); |
2952 | ||
94f04347 | 2953 | static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = { |
80876c20 | 2954 | [EXEC_OUTPUT_INHERIT] = "inherit", |
94f04347 | 2955 | [EXEC_OUTPUT_NULL] = "null", |
80876c20 | 2956 | [EXEC_OUTPUT_TTY] = "tty", |
94f04347 | 2957 | [EXEC_OUTPUT_SYSLOG] = "syslog", |
28dbc1e8 | 2958 | [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console", |
9a6bca7a | 2959 | [EXEC_OUTPUT_KMSG] = "kmsg", |
28dbc1e8 | 2960 | [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console", |
706343f4 LP |
2961 | [EXEC_OUTPUT_JOURNAL] = "journal", |
2962 | [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console", | |
4f2d528d | 2963 | [EXEC_OUTPUT_SOCKET] = "socket" |
94f04347 LP |
2964 | }; |
2965 | ||
2966 | DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput); | |
023a4f67 LP |
2967 | |
2968 | static const char* const exec_utmp_mode_table[_EXEC_UTMP_MODE_MAX] = { | |
2969 | [EXEC_UTMP_INIT] = "init", | |
2970 | [EXEC_UTMP_LOGIN] = "login", | |
2971 | [EXEC_UTMP_USER] = "user", | |
2972 | }; | |
2973 | ||
2974 | DEFINE_STRING_TABLE_LOOKUP(exec_utmp_mode, ExecUtmpMode); |