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Commit | Line | Data |
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a7334b09 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
7 | under the terms of the GNU Lesser General Public License as published by |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
a7334b09 LP |
9 | (at your option) any later version. |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 14 | Lesser General Public License for more details. |
a7334b09 | 15 | |
5430f7f2 | 16 | You should have received a copy of the GNU Lesser General Public License |
a7334b09 LP |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
18 | ***/ | |
19 | ||
034c6ed7 LP |
20 | #include <errno.h> |
21 | #include <fcntl.h> | |
8dd4c05b LP |
22 | #include <glob.h> |
23 | #include <grp.h> | |
24 | #include <poll.h> | |
309bff19 | 25 | #include <signal.h> |
8dd4c05b | 26 | #include <string.h> |
19c0b0b9 | 27 | #include <sys/capability.h> |
f3e43635 | 28 | #include <sys/mman.h> |
8dd4c05b | 29 | #include <sys/personality.h> |
94f04347 | 30 | #include <sys/prctl.h> |
8dd4c05b | 31 | #include <sys/socket.h> |
451a074f | 32 | #include <sys/stat.h> |
8dd4c05b LP |
33 | #include <sys/un.h> |
34 | #include <unistd.h> | |
023a4f67 | 35 | #include <utmpx.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 | ||
24882e06 | 53 | #include "sd-messages.h" |
8dd4c05b LP |
54 | |
55 | #include "af-list.h" | |
b5efdb8a | 56 | #include "alloc-util.h" |
3ffd4af2 LP |
57 | #ifdef HAVE_APPARMOR |
58 | #include "apparmor-util.h" | |
59 | #endif | |
8dd4c05b LP |
60 | #include "async.h" |
61 | #include "barrier.h" | |
8dd4c05b | 62 | #include "cap-list.h" |
430f0182 | 63 | #include "capability-util.h" |
f6a6225e | 64 | #include "def.h" |
4d1a6904 | 65 | #include "env-util.h" |
17df7223 | 66 | #include "errno-list.h" |
3ffd4af2 | 67 | #include "execute.h" |
8dd4c05b | 68 | #include "exit-status.h" |
3ffd4af2 | 69 | #include "fd-util.h" |
8dd4c05b | 70 | #include "fileio.h" |
6482f626 | 71 | #include "formats-util.h" |
f4f15635 | 72 | #include "fs-util.h" |
7d50b32a | 73 | #include "glob-util.h" |
c004493c | 74 | #include "io-util.h" |
8dd4c05b LP |
75 | #include "ioprio.h" |
76 | #include "log.h" | |
77 | #include "macro.h" | |
78 | #include "missing.h" | |
79 | #include "mkdir.h" | |
80 | #include "namespace.h" | |
6bedfcbb | 81 | #include "parse-util.h" |
8dd4c05b | 82 | #include "path-util.h" |
0b452006 | 83 | #include "process-util.h" |
78f22b97 | 84 | #include "rlimit-util.h" |
8dd4c05b | 85 | #include "rm-rf.h" |
3ffd4af2 LP |
86 | #ifdef HAVE_SECCOMP |
87 | #include "seccomp-util.h" | |
88 | #endif | |
8dd4c05b LP |
89 | #include "securebits.h" |
90 | #include "selinux-util.h" | |
24882e06 | 91 | #include "signal-util.h" |
8dd4c05b | 92 | #include "smack-util.h" |
8b43440b | 93 | #include "string-table.h" |
07630cea | 94 | #include "string-util.h" |
8dd4c05b | 95 | #include "strv.h" |
7ccbd1ae | 96 | #include "syslog-util.h" |
8dd4c05b LP |
97 | #include "terminal-util.h" |
98 | #include "unit.h" | |
b1d4f8e1 | 99 | #include "user-util.h" |
8dd4c05b LP |
100 | #include "util.h" |
101 | #include "utmp-wtmp.h" | |
5cb5a6ff | 102 | |
e056b01d | 103 | #define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC) |
31a7eb86 | 104 | #define IDLE_TIMEOUT2_USEC (1*USEC_PER_SEC) |
e6a26745 | 105 | |
02a51aba LP |
106 | /* This assumes there is a 'tty' group */ |
107 | #define TTY_MODE 0620 | |
108 | ||
531dca78 LP |
109 | #define SNDBUF_SIZE (8*1024*1024) |
110 | ||
034c6ed7 LP |
111 | static int shift_fds(int fds[], unsigned n_fds) { |
112 | int start, restart_from; | |
113 | ||
114 | if (n_fds <= 0) | |
115 | return 0; | |
116 | ||
a0d40ac5 LP |
117 | /* Modifies the fds array! (sorts it) */ |
118 | ||
034c6ed7 LP |
119 | assert(fds); |
120 | ||
121 | start = 0; | |
122 | for (;;) { | |
123 | int i; | |
124 | ||
125 | restart_from = -1; | |
126 | ||
127 | for (i = start; i < (int) n_fds; i++) { | |
128 | int nfd; | |
129 | ||
130 | /* Already at right index? */ | |
131 | if (fds[i] == i+3) | |
132 | continue; | |
133 | ||
3cc2aff1 LP |
134 | nfd = fcntl(fds[i], F_DUPFD, i + 3); |
135 | if (nfd < 0) | |
034c6ed7 LP |
136 | return -errno; |
137 | ||
03e334a1 | 138 | safe_close(fds[i]); |
034c6ed7 LP |
139 | fds[i] = nfd; |
140 | ||
141 | /* Hmm, the fd we wanted isn't free? Then | |
ee33e53a | 142 | * let's remember that and try again from here */ |
034c6ed7 LP |
143 | if (nfd != i+3 && restart_from < 0) |
144 | restart_from = i; | |
145 | } | |
146 | ||
147 | if (restart_from < 0) | |
148 | break; | |
149 | ||
150 | start = restart_from; | |
151 | } | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
c2748801 | 156 | static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) { |
47a71eed | 157 | unsigned i; |
e2c76839 | 158 | int r; |
47a71eed LP |
159 | |
160 | if (n_fds <= 0) | |
161 | return 0; | |
162 | ||
163 | assert(fds); | |
164 | ||
451a074f | 165 | /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */ |
47a71eed LP |
166 | |
167 | for (i = 0; i < n_fds; i++) { | |
47a71eed | 168 | |
3cc2aff1 LP |
169 | r = fd_nonblock(fds[i], nonblock); |
170 | if (r < 0) | |
e2c76839 | 171 | return r; |
47a71eed | 172 | |
451a074f LP |
173 | /* We unconditionally drop FD_CLOEXEC from the fds, |
174 | * since after all we want to pass these fds to our | |
175 | * children */ | |
47a71eed | 176 | |
3cc2aff1 LP |
177 | r = fd_cloexec(fds[i], false); |
178 | if (r < 0) | |
e2c76839 | 179 | return r; |
47a71eed LP |
180 | } |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
1e22b5cd | 185 | static const char *exec_context_tty_path(const ExecContext *context) { |
80876c20 LP |
186 | assert(context); |
187 | ||
1e22b5cd LP |
188 | if (context->stdio_as_fds) |
189 | return NULL; | |
190 | ||
80876c20 LP |
191 | if (context->tty_path) |
192 | return context->tty_path; | |
193 | ||
194 | return "/dev/console"; | |
195 | } | |
196 | ||
1e22b5cd LP |
197 | static void exec_context_tty_reset(const ExecContext *context, const ExecParameters *p) { |
198 | const char *path; | |
199 | ||
6ea832a2 LP |
200 | assert(context); |
201 | ||
1e22b5cd | 202 | path = exec_context_tty_path(context); |
6ea832a2 | 203 | |
1e22b5cd LP |
204 | if (context->tty_vhangup) { |
205 | if (p && p->stdin_fd >= 0) | |
206 | (void) terminal_vhangup_fd(p->stdin_fd); | |
207 | else if (path) | |
208 | (void) terminal_vhangup(path); | |
209 | } | |
6ea832a2 | 210 | |
1e22b5cd LP |
211 | if (context->tty_reset) { |
212 | if (p && p->stdin_fd >= 0) | |
213 | (void) reset_terminal_fd(p->stdin_fd, true); | |
214 | else if (path) | |
215 | (void) reset_terminal(path); | |
216 | } | |
217 | ||
218 | if (context->tty_vt_disallocate && path) | |
219 | (void) vt_disallocate(path); | |
6ea832a2 LP |
220 | } |
221 | ||
6af760f3 LP |
222 | static bool is_terminal_input(ExecInput i) { |
223 | return IN_SET(i, | |
224 | EXEC_INPUT_TTY, | |
225 | EXEC_INPUT_TTY_FORCE, | |
226 | EXEC_INPUT_TTY_FAIL); | |
227 | } | |
228 | ||
3a1286b6 | 229 | static bool is_terminal_output(ExecOutput o) { |
6af760f3 LP |
230 | return IN_SET(o, |
231 | EXEC_OUTPUT_TTY, | |
232 | EXEC_OUTPUT_SYSLOG_AND_CONSOLE, | |
233 | EXEC_OUTPUT_KMSG_AND_CONSOLE, | |
234 | EXEC_OUTPUT_JOURNAL_AND_CONSOLE); | |
235 | } | |
236 | ||
237 | static bool exec_context_needs_term(const ExecContext *c) { | |
238 | assert(c); | |
239 | ||
240 | /* Return true if the execution context suggests we should set $TERM to something useful. */ | |
241 | ||
242 | if (is_terminal_input(c->std_input)) | |
243 | return true; | |
244 | ||
245 | if (is_terminal_output(c->std_output)) | |
246 | return true; | |
247 | ||
248 | if (is_terminal_output(c->std_error)) | |
249 | return true; | |
250 | ||
251 | return !!c->tty_path; | |
3a1286b6 MS |
252 | } |
253 | ||
80876c20 LP |
254 | static int open_null_as(int flags, int nfd) { |
255 | int fd, r; | |
071830ff | 256 | |
80876c20 | 257 | assert(nfd >= 0); |
071830ff | 258 | |
613b411c LP |
259 | fd = open("/dev/null", flags|O_NOCTTY); |
260 | if (fd < 0) | |
071830ff LP |
261 | return -errno; |
262 | ||
80876c20 LP |
263 | if (fd != nfd) { |
264 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 265 | safe_close(fd); |
80876c20 LP |
266 | } else |
267 | r = nfd; | |
071830ff | 268 | |
80876c20 | 269 | return r; |
071830ff LP |
270 | } |
271 | ||
524daa8c | 272 | static int connect_journal_socket(int fd, uid_t uid, gid_t gid) { |
b92bea5d ZJS |
273 | union sockaddr_union sa = { |
274 | .un.sun_family = AF_UNIX, | |
275 | .un.sun_path = "/run/systemd/journal/stdout", | |
276 | }; | |
524daa8c ZJS |
277 | uid_t olduid = UID_INVALID; |
278 | gid_t oldgid = GID_INVALID; | |
279 | int r; | |
280 | ||
281 | if (gid != GID_INVALID) { | |
282 | oldgid = getgid(); | |
283 | ||
284 | r = setegid(gid); | |
285 | if (r < 0) | |
286 | return -errno; | |
287 | } | |
288 | ||
289 | if (uid != UID_INVALID) { | |
290 | olduid = getuid(); | |
291 | ||
292 | r = seteuid(uid); | |
293 | if (r < 0) { | |
294 | r = -errno; | |
295 | goto restore_gid; | |
296 | } | |
297 | } | |
298 | ||
fc2fffe7 | 299 | r = connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)); |
524daa8c ZJS |
300 | if (r < 0) |
301 | r = -errno; | |
302 | ||
303 | /* If we fail to restore the uid or gid, things will likely | |
304 | fail later on. This should only happen if an LSM interferes. */ | |
305 | ||
306 | if (uid != UID_INVALID) | |
307 | (void) seteuid(olduid); | |
308 | ||
309 | restore_gid: | |
310 | if (gid != GID_INVALID) | |
311 | (void) setegid(oldgid); | |
312 | ||
313 | return r; | |
314 | } | |
315 | ||
fd1f9c89 | 316 | static int connect_logger_as( |
7a1ab780 | 317 | Unit *unit, |
fd1f9c89 LP |
318 | const ExecContext *context, |
319 | ExecOutput output, | |
320 | const char *ident, | |
fd1f9c89 LP |
321 | int nfd, |
322 | uid_t uid, | |
323 | gid_t gid) { | |
324 | ||
524daa8c | 325 | int fd, r; |
071830ff LP |
326 | |
327 | assert(context); | |
80876c20 LP |
328 | assert(output < _EXEC_OUTPUT_MAX); |
329 | assert(ident); | |
330 | assert(nfd >= 0); | |
071830ff | 331 | |
54fe0cdb LP |
332 | fd = socket(AF_UNIX, SOCK_STREAM, 0); |
333 | if (fd < 0) | |
80876c20 | 334 | return -errno; |
071830ff | 335 | |
524daa8c ZJS |
336 | r = connect_journal_socket(fd, uid, gid); |
337 | if (r < 0) | |
338 | return r; | |
071830ff | 339 | |
80876c20 | 340 | if (shutdown(fd, SHUT_RD) < 0) { |
03e334a1 | 341 | safe_close(fd); |
80876c20 LP |
342 | return -errno; |
343 | } | |
071830ff | 344 | |
fd1f9c89 | 345 | (void) fd_inc_sndbuf(fd, SNDBUF_SIZE); |
531dca78 | 346 | |
80876c20 | 347 | dprintf(fd, |
62bca2c6 | 348 | "%s\n" |
80876c20 LP |
349 | "%s\n" |
350 | "%i\n" | |
54fe0cdb LP |
351 | "%i\n" |
352 | "%i\n" | |
353 | "%i\n" | |
4f4a1dbf | 354 | "%i\n", |
4f4a1dbf | 355 | context->syslog_identifier ? context->syslog_identifier : ident, |
7a1ab780 | 356 | unit->id, |
54fe0cdb LP |
357 | context->syslog_priority, |
358 | !!context->syslog_level_prefix, | |
359 | output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE, | |
360 | output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE, | |
3a1286b6 | 361 | is_terminal_output(output)); |
80876c20 | 362 | |
fd1f9c89 LP |
363 | if (fd == nfd) |
364 | return nfd; | |
365 | ||
366 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
367 | safe_close(fd); | |
071830ff | 368 | |
80876c20 LP |
369 | return r; |
370 | } | |
371 | static int open_terminal_as(const char *path, mode_t mode, int nfd) { | |
372 | int fd, r; | |
071830ff | 373 | |
80876c20 LP |
374 | assert(path); |
375 | assert(nfd >= 0); | |
071830ff | 376 | |
3cc2aff1 LP |
377 | fd = open_terminal(path, mode | O_NOCTTY); |
378 | if (fd < 0) | |
80876c20 | 379 | return fd; |
071830ff | 380 | |
80876c20 LP |
381 | if (fd != nfd) { |
382 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 383 | safe_close(fd); |
80876c20 LP |
384 | } else |
385 | r = nfd; | |
071830ff | 386 | |
80876c20 LP |
387 | return r; |
388 | } | |
071830ff | 389 | |
1e3ad081 LP |
390 | static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) { |
391 | ||
392 | if (is_terminal_input(std_input) && !apply_tty_stdin) | |
393 | return EXEC_INPUT_NULL; | |
071830ff | 394 | |
03fd9c49 | 395 | if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0) |
4f2d528d LP |
396 | return EXEC_INPUT_NULL; |
397 | ||
03fd9c49 | 398 | return std_input; |
4f2d528d LP |
399 | } |
400 | ||
03fd9c49 | 401 | static int fixup_output(ExecOutput std_output, int socket_fd) { |
4f2d528d | 402 | |
03fd9c49 | 403 | if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0) |
4f2d528d LP |
404 | return EXEC_OUTPUT_INHERIT; |
405 | ||
03fd9c49 | 406 | return std_output; |
4f2d528d LP |
407 | } |
408 | ||
a34ceba6 LP |
409 | static int setup_input( |
410 | const ExecContext *context, | |
411 | const ExecParameters *params, | |
412 | int socket_fd) { | |
413 | ||
4f2d528d LP |
414 | ExecInput i; |
415 | ||
416 | assert(context); | |
a34ceba6 LP |
417 | assert(params); |
418 | ||
419 | if (params->stdin_fd >= 0) { | |
420 | if (dup2(params->stdin_fd, STDIN_FILENO) < 0) | |
421 | return -errno; | |
422 | ||
423 | /* Try to make this the controlling tty, if it is a tty, and reset it */ | |
424 | (void) ioctl(STDIN_FILENO, TIOCSCTTY, context->std_input == EXEC_INPUT_TTY_FORCE); | |
425 | (void) reset_terminal_fd(STDIN_FILENO, true); | |
426 | ||
427 | return STDIN_FILENO; | |
428 | } | |
4f2d528d | 429 | |
c39f1ce2 | 430 | i = fixup_input(context->std_input, socket_fd, params->flags & EXEC_APPLY_TTY_STDIN); |
4f2d528d LP |
431 | |
432 | switch (i) { | |
071830ff | 433 | |
80876c20 LP |
434 | case EXEC_INPUT_NULL: |
435 | return open_null_as(O_RDONLY, STDIN_FILENO); | |
436 | ||
437 | case EXEC_INPUT_TTY: | |
438 | case EXEC_INPUT_TTY_FORCE: | |
439 | case EXEC_INPUT_TTY_FAIL: { | |
440 | int fd, r; | |
071830ff | 441 | |
1e22b5cd | 442 | fd = acquire_terminal(exec_context_tty_path(context), |
970edce6 ZJS |
443 | i == EXEC_INPUT_TTY_FAIL, |
444 | i == EXEC_INPUT_TTY_FORCE, | |
445 | false, | |
3a43da28 | 446 | USEC_INFINITY); |
970edce6 | 447 | if (fd < 0) |
80876c20 LP |
448 | return fd; |
449 | ||
450 | if (fd != STDIN_FILENO) { | |
451 | r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
03e334a1 | 452 | safe_close(fd); |
80876c20 LP |
453 | } else |
454 | r = STDIN_FILENO; | |
455 | ||
456 | return r; | |
457 | } | |
458 | ||
4f2d528d LP |
459 | case EXEC_INPUT_SOCKET: |
460 | return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
461 | ||
80876c20 LP |
462 | default: |
463 | assert_not_reached("Unknown input type"); | |
464 | } | |
465 | } | |
466 | ||
a34ceba6 LP |
467 | static int setup_output( |
468 | Unit *unit, | |
469 | const ExecContext *context, | |
470 | const ExecParameters *params, | |
471 | int fileno, | |
472 | int socket_fd, | |
473 | const char *ident, | |
7bce046b LP |
474 | uid_t uid, |
475 | gid_t gid, | |
476 | dev_t *journal_stream_dev, | |
477 | ino_t *journal_stream_ino) { | |
a34ceba6 | 478 | |
4f2d528d LP |
479 | ExecOutput o; |
480 | ExecInput i; | |
47c1d80d | 481 | int r; |
4f2d528d | 482 | |
f2341e0a | 483 | assert(unit); |
80876c20 | 484 | assert(context); |
a34ceba6 | 485 | assert(params); |
80876c20 | 486 | assert(ident); |
7bce046b LP |
487 | assert(journal_stream_dev); |
488 | assert(journal_stream_ino); | |
80876c20 | 489 | |
a34ceba6 LP |
490 | if (fileno == STDOUT_FILENO && params->stdout_fd >= 0) { |
491 | ||
492 | if (dup2(params->stdout_fd, STDOUT_FILENO) < 0) | |
493 | return -errno; | |
494 | ||
495 | return STDOUT_FILENO; | |
496 | } | |
497 | ||
498 | if (fileno == STDERR_FILENO && params->stderr_fd >= 0) { | |
499 | if (dup2(params->stderr_fd, STDERR_FILENO) < 0) | |
500 | return -errno; | |
501 | ||
502 | return STDERR_FILENO; | |
503 | } | |
504 | ||
c39f1ce2 | 505 | i = fixup_input(context->std_input, socket_fd, params->flags & EXEC_APPLY_TTY_STDIN); |
03fd9c49 | 506 | o = fixup_output(context->std_output, socket_fd); |
4f2d528d | 507 | |
eb17e935 MS |
508 | if (fileno == STDERR_FILENO) { |
509 | ExecOutput e; | |
510 | e = fixup_output(context->std_error, socket_fd); | |
80876c20 | 511 | |
eb17e935 MS |
512 | /* This expects the input and output are already set up */ |
513 | ||
514 | /* Don't change the stderr file descriptor if we inherit all | |
515 | * the way and are not on a tty */ | |
516 | if (e == EXEC_OUTPUT_INHERIT && | |
517 | o == EXEC_OUTPUT_INHERIT && | |
518 | i == EXEC_INPUT_NULL && | |
519 | !is_terminal_input(context->std_input) && | |
520 | getppid () != 1) | |
521 | return fileno; | |
522 | ||
523 | /* Duplicate from stdout if possible */ | |
524 | if (e == o || e == EXEC_OUTPUT_INHERIT) | |
525 | return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno; | |
071830ff | 526 | |
eb17e935 | 527 | o = e; |
80876c20 | 528 | |
eb17e935 | 529 | } else if (o == EXEC_OUTPUT_INHERIT) { |
21d21ea4 LP |
530 | /* If input got downgraded, inherit the original value */ |
531 | if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input)) | |
1e22b5cd | 532 | return open_terminal_as(exec_context_tty_path(context), O_WRONLY, fileno); |
21d21ea4 | 533 | |
acb591e4 | 534 | /* If the input is connected to anything that's not a /dev/null, inherit that... */ |
ff876e28 | 535 | if (i != EXEC_INPUT_NULL) |
eb17e935 | 536 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; |
071830ff | 537 | |
acb591e4 LP |
538 | /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */ |
539 | if (getppid() != 1) | |
eb17e935 | 540 | return fileno; |
94f04347 | 541 | |
eb17e935 MS |
542 | /* We need to open /dev/null here anew, to get the right access mode. */ |
543 | return open_null_as(O_WRONLY, fileno); | |
071830ff | 544 | } |
94f04347 | 545 | |
eb17e935 | 546 | switch (o) { |
80876c20 LP |
547 | |
548 | case EXEC_OUTPUT_NULL: | |
eb17e935 | 549 | return open_null_as(O_WRONLY, fileno); |
80876c20 LP |
550 | |
551 | case EXEC_OUTPUT_TTY: | |
4f2d528d | 552 | if (is_terminal_input(i)) |
eb17e935 | 553 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; |
80876c20 LP |
554 | |
555 | /* We don't reset the terminal if this is just about output */ | |
1e22b5cd | 556 | return open_terminal_as(exec_context_tty_path(context), O_WRONLY, fileno); |
80876c20 LP |
557 | |
558 | case EXEC_OUTPUT_SYSLOG: | |
28dbc1e8 | 559 | case EXEC_OUTPUT_SYSLOG_AND_CONSOLE: |
9a6bca7a | 560 | case EXEC_OUTPUT_KMSG: |
28dbc1e8 | 561 | case EXEC_OUTPUT_KMSG_AND_CONSOLE: |
706343f4 LP |
562 | case EXEC_OUTPUT_JOURNAL: |
563 | case EXEC_OUTPUT_JOURNAL_AND_CONSOLE: | |
7a1ab780 | 564 | r = connect_logger_as(unit, context, o, ident, fileno, uid, gid); |
47c1d80d | 565 | if (r < 0) { |
f2341e0a | 566 | log_unit_error_errno(unit, r, "Failed to connect %s to the journal socket, ignoring: %m", fileno == STDOUT_FILENO ? "stdout" : "stderr"); |
eb17e935 | 567 | r = open_null_as(O_WRONLY, fileno); |
7bce046b LP |
568 | } else { |
569 | struct stat st; | |
570 | ||
571 | /* If we connected this fd to the journal via a stream, patch the device/inode into the passed | |
572 | * parameters, but only then. This is useful so that we can set $JOURNAL_STREAM that permits | |
573 | * services to detect whether they are connected to the journal or not. */ | |
574 | ||
575 | if (fstat(fileno, &st) >= 0) { | |
576 | *journal_stream_dev = st.st_dev; | |
577 | *journal_stream_ino = st.st_ino; | |
578 | } | |
47c1d80d MS |
579 | } |
580 | return r; | |
4f2d528d LP |
581 | |
582 | case EXEC_OUTPUT_SOCKET: | |
583 | assert(socket_fd >= 0); | |
eb17e935 | 584 | return dup2(socket_fd, fileno) < 0 ? -errno : fileno; |
94f04347 LP |
585 | |
586 | default: | |
80876c20 | 587 | assert_not_reached("Unknown error type"); |
94f04347 | 588 | } |
071830ff LP |
589 | } |
590 | ||
02a51aba LP |
591 | static int chown_terminal(int fd, uid_t uid) { |
592 | struct stat st; | |
593 | ||
594 | assert(fd >= 0); | |
02a51aba | 595 | |
1ff74fb6 LP |
596 | /* Before we chown/chmod the TTY, let's ensure this is actually a tty */ |
597 | if (isatty(fd) < 1) | |
598 | return 0; | |
599 | ||
02a51aba | 600 | /* This might fail. What matters are the results. */ |
bab45044 LP |
601 | (void) fchown(fd, uid, -1); |
602 | (void) fchmod(fd, TTY_MODE); | |
02a51aba LP |
603 | |
604 | if (fstat(fd, &st) < 0) | |
605 | return -errno; | |
606 | ||
d8b4e2e9 | 607 | if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE) |
02a51aba LP |
608 | return -EPERM; |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
3d18b167 LP |
613 | static int setup_confirm_stdio(int *_saved_stdin, int *_saved_stdout) { |
614 | _cleanup_close_ int fd = -1, saved_stdin = -1, saved_stdout = -1; | |
615 | int r; | |
80876c20 | 616 | |
80876c20 LP |
617 | assert(_saved_stdin); |
618 | assert(_saved_stdout); | |
619 | ||
af6da548 LP |
620 | saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3); |
621 | if (saved_stdin < 0) | |
622 | return -errno; | |
80876c20 | 623 | |
af6da548 | 624 | saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3); |
3d18b167 LP |
625 | if (saved_stdout < 0) |
626 | return -errno; | |
80876c20 | 627 | |
af6da548 LP |
628 | fd = acquire_terminal( |
629 | "/dev/console", | |
630 | false, | |
631 | false, | |
632 | false, | |
633 | DEFAULT_CONFIRM_USEC); | |
3d18b167 LP |
634 | if (fd < 0) |
635 | return fd; | |
80876c20 | 636 | |
af6da548 LP |
637 | r = chown_terminal(fd, getuid()); |
638 | if (r < 0) | |
3d18b167 | 639 | return r; |
02a51aba | 640 | |
3d18b167 LP |
641 | r = reset_terminal_fd(fd, true); |
642 | if (r < 0) | |
643 | return r; | |
80876c20 | 644 | |
3d18b167 LP |
645 | if (dup2(fd, STDIN_FILENO) < 0) |
646 | return -errno; | |
647 | ||
648 | if (dup2(fd, STDOUT_FILENO) < 0) | |
649 | return -errno; | |
80876c20 LP |
650 | |
651 | if (fd >= 2) | |
03e334a1 | 652 | safe_close(fd); |
3d18b167 | 653 | fd = -1; |
80876c20 LP |
654 | |
655 | *_saved_stdin = saved_stdin; | |
656 | *_saved_stdout = saved_stdout; | |
657 | ||
3d18b167 | 658 | saved_stdin = saved_stdout = -1; |
80876c20 | 659 | |
3d18b167 | 660 | return 0; |
80876c20 LP |
661 | } |
662 | ||
44b601bc | 663 | _printf_(1, 2) static int write_confirm_message(const char *format, ...) { |
03e334a1 | 664 | _cleanup_close_ int fd = -1; |
af6da548 | 665 | va_list ap; |
80876c20 | 666 | |
af6da548 | 667 | assert(format); |
80876c20 | 668 | |
af6da548 LP |
669 | fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); |
670 | if (fd < 0) | |
671 | return fd; | |
80876c20 | 672 | |
af6da548 LP |
673 | va_start(ap, format); |
674 | vdprintf(fd, format, ap); | |
675 | va_end(ap); | |
80876c20 | 676 | |
af6da548 LP |
677 | return 0; |
678 | } | |
80876c20 | 679 | |
3d18b167 | 680 | static int restore_confirm_stdio(int *saved_stdin, int *saved_stdout) { |
af6da548 | 681 | int r = 0; |
80876c20 | 682 | |
af6da548 LP |
683 | assert(saved_stdin); |
684 | assert(saved_stdout); | |
685 | ||
686 | release_terminal(); | |
687 | ||
688 | if (*saved_stdin >= 0) | |
80876c20 | 689 | if (dup2(*saved_stdin, STDIN_FILENO) < 0) |
af6da548 | 690 | r = -errno; |
80876c20 | 691 | |
af6da548 | 692 | if (*saved_stdout >= 0) |
80876c20 | 693 | if (dup2(*saved_stdout, STDOUT_FILENO) < 0) |
af6da548 | 694 | r = -errno; |
80876c20 | 695 | |
3d18b167 LP |
696 | *saved_stdin = safe_close(*saved_stdin); |
697 | *saved_stdout = safe_close(*saved_stdout); | |
af6da548 LP |
698 | |
699 | return r; | |
700 | } | |
701 | ||
702 | static int ask_for_confirmation(char *response, char **argv) { | |
703 | int saved_stdout = -1, saved_stdin = -1, r; | |
e1d75803 | 704 | _cleanup_free_ char *line = NULL; |
af6da548 LP |
705 | |
706 | r = setup_confirm_stdio(&saved_stdin, &saved_stdout); | |
707 | if (r < 0) | |
708 | return r; | |
709 | ||
710 | line = exec_command_line(argv); | |
711 | if (!line) | |
712 | return -ENOMEM; | |
713 | ||
418b9be5 | 714 | r = ask_char(response, "yns", "Execute %s? [Yes, No, Skip] ", line); |
af6da548 LP |
715 | |
716 | restore_confirm_stdio(&saved_stdin, &saved_stdout); | |
717 | ||
718 | return r; | |
80876c20 LP |
719 | } |
720 | ||
81a2b7ce LP |
721 | static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) { |
722 | bool keep_groups = false; | |
723 | int r; | |
724 | ||
725 | assert(context); | |
726 | ||
35b8ca3a | 727 | /* Lookup and set GID and supplementary group list. Here too |
81a2b7ce LP |
728 | * we avoid NSS lookups for gid=0. */ |
729 | ||
730 | if (context->group || username) { | |
81a2b7ce LP |
731 | /* First step, initialize groups from /etc/groups */ |
732 | if (username && gid != 0) { | |
733 | if (initgroups(username, gid) < 0) | |
734 | return -errno; | |
735 | ||
736 | keep_groups = true; | |
737 | } | |
738 | ||
739 | /* Second step, set our gids */ | |
740 | if (setresgid(gid, gid, gid) < 0) | |
741 | return -errno; | |
742 | } | |
743 | ||
744 | if (context->supplementary_groups) { | |
745 | int ngroups_max, k; | |
746 | gid_t *gids; | |
747 | char **i; | |
748 | ||
749 | /* Final step, initialize any manually set supplementary groups */ | |
da19d5c1 | 750 | assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0); |
81a2b7ce LP |
751 | |
752 | if (!(gids = new(gid_t, ngroups_max))) | |
753 | return -ENOMEM; | |
754 | ||
755 | if (keep_groups) { | |
3cc2aff1 LP |
756 | k = getgroups(ngroups_max, gids); |
757 | if (k < 0) { | |
81a2b7ce LP |
758 | free(gids); |
759 | return -errno; | |
760 | } | |
761 | } else | |
762 | k = 0; | |
763 | ||
764 | STRV_FOREACH(i, context->supplementary_groups) { | |
4b67834e | 765 | const char *g; |
81a2b7ce LP |
766 | |
767 | if (k >= ngroups_max) { | |
768 | free(gids); | |
769 | return -E2BIG; | |
770 | } | |
771 | ||
4b67834e LP |
772 | g = *i; |
773 | r = get_group_creds(&g, gids+k); | |
774 | if (r < 0) { | |
81a2b7ce LP |
775 | free(gids); |
776 | return r; | |
777 | } | |
778 | ||
779 | k++; | |
780 | } | |
781 | ||
782 | if (setgroups(k, gids) < 0) { | |
783 | free(gids); | |
784 | return -errno; | |
785 | } | |
786 | ||
787 | free(gids); | |
788 | } | |
789 | ||
790 | return 0; | |
791 | } | |
792 | ||
793 | static int enforce_user(const ExecContext *context, uid_t uid) { | |
81a2b7ce LP |
794 | assert(context); |
795 | ||
479050b3 | 796 | /* Sets (but doesn't look up) the uid and make sure we keep the |
81a2b7ce LP |
797 | * capabilities while doing so. */ |
798 | ||
479050b3 | 799 | if (context->capability_ambient_set != 0) { |
81a2b7ce LP |
800 | |
801 | /* First step: If we need to keep capabilities but | |
802 | * drop privileges we need to make sure we keep our | |
cbb21cca | 803 | * caps, while we drop privileges. */ |
693ced48 | 804 | if (uid != 0) { |
cbb21cca | 805 | int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS; |
693ced48 LP |
806 | |
807 | if (prctl(PR_GET_SECUREBITS) != sb) | |
808 | if (prctl(PR_SET_SECUREBITS, sb) < 0) | |
809 | return -errno; | |
810 | } | |
81a2b7ce LP |
811 | } |
812 | ||
479050b3 | 813 | /* Second step: actually set the uids */ |
81a2b7ce LP |
814 | if (setresuid(uid, uid, uid) < 0) |
815 | return -errno; | |
816 | ||
817 | /* At this point we should have all necessary capabilities but | |
818 | are otherwise a normal user. However, the caps might got | |
819 | corrupted due to the setresuid() so we need clean them up | |
820 | later. This is done outside of this call. */ | |
821 | ||
822 | return 0; | |
823 | } | |
824 | ||
5b6319dc LP |
825 | #ifdef HAVE_PAM |
826 | ||
827 | static int null_conv( | |
828 | int num_msg, | |
829 | const struct pam_message **msg, | |
830 | struct pam_response **resp, | |
831 | void *appdata_ptr) { | |
832 | ||
833 | /* We don't support conversations */ | |
834 | ||
835 | return PAM_CONV_ERR; | |
836 | } | |
837 | ||
838 | static int setup_pam( | |
839 | const char *name, | |
840 | const char *user, | |
940c5210 | 841 | uid_t uid, |
5b6319dc | 842 | const char *tty, |
2065ca69 | 843 | char ***env, |
5b6319dc LP |
844 | int fds[], unsigned n_fds) { |
845 | ||
846 | static const struct pam_conv conv = { | |
847 | .conv = null_conv, | |
848 | .appdata_ptr = NULL | |
849 | }; | |
850 | ||
2d7c6aa2 | 851 | _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL; |
5b6319dc | 852 | pam_handle_t *handle = NULL; |
d6e5f3ad | 853 | sigset_t old_ss; |
7bb70b6e | 854 | int pam_code = PAM_SUCCESS, r; |
84eada2f | 855 | char **nv, **e = NULL; |
5b6319dc LP |
856 | bool close_session = false; |
857 | pid_t pam_pid = 0, parent_pid; | |
970edce6 | 858 | int flags = 0; |
5b6319dc LP |
859 | |
860 | assert(name); | |
861 | assert(user); | |
2065ca69 | 862 | assert(env); |
5b6319dc LP |
863 | |
864 | /* We set up PAM in the parent process, then fork. The child | |
35b8ca3a | 865 | * will then stay around until killed via PR_GET_PDEATHSIG or |
5b6319dc LP |
866 | * systemd via the cgroup logic. It will then remove the PAM |
867 | * session again. The parent process will exec() the actual | |
868 | * daemon. We do things this way to ensure that the main PID | |
869 | * of the daemon is the one we initially fork()ed. */ | |
870 | ||
7bb70b6e LP |
871 | r = barrier_create(&barrier); |
872 | if (r < 0) | |
2d7c6aa2 DH |
873 | goto fail; |
874 | ||
553d2243 | 875 | if (log_get_max_level() < LOG_DEBUG) |
970edce6 ZJS |
876 | flags |= PAM_SILENT; |
877 | ||
f546241b ZJS |
878 | pam_code = pam_start(name, user, &conv, &handle); |
879 | if (pam_code != PAM_SUCCESS) { | |
5b6319dc LP |
880 | handle = NULL; |
881 | goto fail; | |
882 | } | |
883 | ||
f546241b ZJS |
884 | if (tty) { |
885 | pam_code = pam_set_item(handle, PAM_TTY, tty); | |
886 | if (pam_code != PAM_SUCCESS) | |
5b6319dc | 887 | goto fail; |
f546241b | 888 | } |
5b6319dc | 889 | |
84eada2f JW |
890 | STRV_FOREACH(nv, *env) { |
891 | pam_code = pam_putenv(handle, *nv); | |
2065ca69 JW |
892 | if (pam_code != PAM_SUCCESS) |
893 | goto fail; | |
894 | } | |
895 | ||
970edce6 | 896 | pam_code = pam_acct_mgmt(handle, flags); |
f546241b | 897 | if (pam_code != PAM_SUCCESS) |
5b6319dc LP |
898 | goto fail; |
899 | ||
970edce6 | 900 | pam_code = pam_open_session(handle, flags); |
f546241b | 901 | if (pam_code != PAM_SUCCESS) |
5b6319dc LP |
902 | goto fail; |
903 | ||
904 | close_session = true; | |
905 | ||
f546241b ZJS |
906 | e = pam_getenvlist(handle); |
907 | if (!e) { | |
5b6319dc LP |
908 | pam_code = PAM_BUF_ERR; |
909 | goto fail; | |
910 | } | |
911 | ||
912 | /* Block SIGTERM, so that we know that it won't get lost in | |
913 | * the child */ | |
ce30c8dc | 914 | |
72c0a2c2 | 915 | assert_se(sigprocmask_many(SIG_BLOCK, &old_ss, SIGTERM, -1) >= 0); |
5b6319dc LP |
916 | |
917 | parent_pid = getpid(); | |
918 | ||
f546241b | 919 | pam_pid = fork(); |
7bb70b6e LP |
920 | if (pam_pid < 0) { |
921 | r = -errno; | |
5b6319dc | 922 | goto fail; |
7bb70b6e | 923 | } |
5b6319dc LP |
924 | |
925 | if (pam_pid == 0) { | |
7bb70b6e | 926 | int sig, ret = EXIT_PAM; |
5b6319dc LP |
927 | |
928 | /* The child's job is to reset the PAM session on | |
929 | * termination */ | |
2d7c6aa2 | 930 | barrier_set_role(&barrier, BARRIER_CHILD); |
5b6319dc LP |
931 | |
932 | /* This string must fit in 10 chars (i.e. the length | |
5d6b1584 LP |
933 | * of "/sbin/init"), to look pretty in /bin/ps */ |
934 | rename_process("(sd-pam)"); | |
5b6319dc LP |
935 | |
936 | /* Make sure we don't keep open the passed fds in this | |
937 | child. We assume that otherwise only those fds are | |
938 | open here that have been opened by PAM. */ | |
939 | close_many(fds, n_fds); | |
940 | ||
940c5210 AK |
941 | /* Drop privileges - we don't need any to pam_close_session |
942 | * and this will make PR_SET_PDEATHSIG work in most cases. | |
943 | * If this fails, ignore the error - but expect sd-pam threads | |
944 | * to fail to exit normally */ | |
945 | if (setresuid(uid, uid, uid) < 0) | |
da927ba9 | 946 | log_error_errno(r, "Error: Failed to setresuid() in sd-pam: %m"); |
940c5210 | 947 | |
ce30c8dc LP |
948 | (void) ignore_signals(SIGPIPE, -1); |
949 | ||
940c5210 AK |
950 | /* Wait until our parent died. This will only work if |
951 | * the above setresuid() succeeds, otherwise the kernel | |
952 | * will not allow unprivileged parents kill their privileged | |
953 | * children this way. We rely on the control groups kill logic | |
5b6319dc LP |
954 | * to do the rest for us. */ |
955 | if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) | |
956 | goto child_finish; | |
957 | ||
2d7c6aa2 DH |
958 | /* Tell the parent that our setup is done. This is especially |
959 | * important regarding dropping privileges. Otherwise, unit | |
960 | * setup might race against our setresuid(2) call. */ | |
961 | barrier_place(&barrier); | |
962 | ||
5b6319dc LP |
963 | /* Check if our parent process might already have |
964 | * died? */ | |
965 | if (getppid() == parent_pid) { | |
d6e5f3ad DM |
966 | sigset_t ss; |
967 | ||
968 | assert_se(sigemptyset(&ss) >= 0); | |
969 | assert_se(sigaddset(&ss, SIGTERM) >= 0); | |
970 | ||
3dead8d9 LP |
971 | for (;;) { |
972 | if (sigwait(&ss, &sig) < 0) { | |
973 | if (errno == EINTR) | |
974 | continue; | |
975 | ||
976 | goto child_finish; | |
977 | } | |
5b6319dc | 978 | |
3dead8d9 LP |
979 | assert(sig == SIGTERM); |
980 | break; | |
981 | } | |
5b6319dc LP |
982 | } |
983 | ||
3dead8d9 | 984 | /* If our parent died we'll end the session */ |
f546241b | 985 | if (getppid() != parent_pid) { |
970edce6 | 986 | pam_code = pam_close_session(handle, flags); |
f546241b | 987 | if (pam_code != PAM_SUCCESS) |
5b6319dc | 988 | goto child_finish; |
f546241b | 989 | } |
5b6319dc | 990 | |
7bb70b6e | 991 | ret = 0; |
5b6319dc LP |
992 | |
993 | child_finish: | |
970edce6 | 994 | pam_end(handle, pam_code | flags); |
7bb70b6e | 995 | _exit(ret); |
5b6319dc LP |
996 | } |
997 | ||
2d7c6aa2 DH |
998 | barrier_set_role(&barrier, BARRIER_PARENT); |
999 | ||
5b6319dc LP |
1000 | /* If the child was forked off successfully it will do all the |
1001 | * cleanups, so forget about the handle here. */ | |
1002 | handle = NULL; | |
1003 | ||
3b8bddde | 1004 | /* Unblock SIGTERM again in the parent */ |
72c0a2c2 | 1005 | assert_se(sigprocmask(SIG_SETMASK, &old_ss, NULL) >= 0); |
5b6319dc LP |
1006 | |
1007 | /* We close the log explicitly here, since the PAM modules | |
1008 | * might have opened it, but we don't want this fd around. */ | |
1009 | closelog(); | |
1010 | ||
2d7c6aa2 DH |
1011 | /* Synchronously wait for the child to initialize. We don't care for |
1012 | * errors as we cannot recover. However, warn loudly if it happens. */ | |
1013 | if (!barrier_place_and_sync(&barrier)) | |
1014 | log_error("PAM initialization failed"); | |
1015 | ||
2065ca69 JW |
1016 | strv_free(*env); |
1017 | *env = e; | |
aa87e624 | 1018 | |
5b6319dc LP |
1019 | return 0; |
1020 | ||
1021 | fail: | |
970edce6 ZJS |
1022 | if (pam_code != PAM_SUCCESS) { |
1023 | log_error("PAM failed: %s", pam_strerror(handle, pam_code)); | |
7bb70b6e LP |
1024 | r = -EPERM; /* PAM errors do not map to errno */ |
1025 | } else | |
1026 | log_error_errno(r, "PAM failed: %m"); | |
9ba35398 | 1027 | |
5b6319dc LP |
1028 | if (handle) { |
1029 | if (close_session) | |
970edce6 | 1030 | pam_code = pam_close_session(handle, flags); |
5b6319dc | 1031 | |
970edce6 | 1032 | pam_end(handle, pam_code | flags); |
5b6319dc LP |
1033 | } |
1034 | ||
1035 | strv_free(e); | |
5b6319dc LP |
1036 | closelog(); |
1037 | ||
7bb70b6e | 1038 | return r; |
5b6319dc LP |
1039 | } |
1040 | #endif | |
1041 | ||
5d6b1584 LP |
1042 | static void rename_process_from_path(const char *path) { |
1043 | char process_name[11]; | |
1044 | const char *p; | |
1045 | size_t l; | |
1046 | ||
1047 | /* This resulting string must fit in 10 chars (i.e. the length | |
1048 | * of "/sbin/init") to look pretty in /bin/ps */ | |
1049 | ||
2b6bf07d | 1050 | p = basename(path); |
5d6b1584 LP |
1051 | if (isempty(p)) { |
1052 | rename_process("(...)"); | |
1053 | return; | |
1054 | } | |
1055 | ||
1056 | l = strlen(p); | |
1057 | if (l > 8) { | |
1058 | /* The end of the process name is usually more | |
1059 | * interesting, since the first bit might just be | |
1060 | * "systemd-" */ | |
1061 | p = p + l - 8; | |
1062 | l = 8; | |
1063 | } | |
1064 | ||
1065 | process_name[0] = '('; | |
1066 | memcpy(process_name+1, p, l); | |
1067 | process_name[1+l] = ')'; | |
1068 | process_name[1+l+1] = 0; | |
1069 | ||
1070 | rename_process(process_name); | |
1071 | } | |
1072 | ||
c0467cf3 | 1073 | #ifdef HAVE_SECCOMP |
17df7223 | 1074 | |
822a5960 | 1075 | static int apply_seccomp(const ExecContext *c) { |
17df7223 LP |
1076 | uint32_t negative_action, action; |
1077 | scmp_filter_ctx *seccomp; | |
c0467cf3 RC |
1078 | Iterator i; |
1079 | void *id; | |
17df7223 | 1080 | int r; |
8351ceae | 1081 | |
c0467cf3 | 1082 | assert(c); |
8351ceae | 1083 | |
17df7223 LP |
1084 | negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno); |
1085 | ||
1086 | seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW); | |
1087 | if (!seccomp) | |
1088 | return -ENOMEM; | |
8351ceae | 1089 | |
e9642be2 LP |
1090 | if (c->syscall_archs) { |
1091 | ||
1092 | SET_FOREACH(id, c->syscall_archs, i) { | |
1093 | r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1); | |
1094 | if (r == -EEXIST) | |
1095 | continue; | |
7c66bae2 LP |
1096 | if (r < 0) |
1097 | goto finish; | |
e9642be2 | 1098 | } |
e9642be2 | 1099 | |
7c66bae2 | 1100 | } else { |
e9642be2 | 1101 | r = seccomp_add_secondary_archs(seccomp); |
7c66bae2 LP |
1102 | if (r < 0) |
1103 | goto finish; | |
57183d11 | 1104 | } |
8351ceae | 1105 | |
57183d11 | 1106 | action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action; |
17df7223 LP |
1107 | SET_FOREACH(id, c->syscall_filter, i) { |
1108 | r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0); | |
7c66bae2 LP |
1109 | if (r < 0) |
1110 | goto finish; | |
c0467cf3 | 1111 | } |
8351ceae | 1112 | |
7c66bae2 LP |
1113 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); |
1114 | if (r < 0) | |
1115 | goto finish; | |
1116 | ||
17df7223 | 1117 | r = seccomp_load(seccomp); |
7c66bae2 LP |
1118 | |
1119 | finish: | |
17df7223 | 1120 | seccomp_release(seccomp); |
4298d0b5 LP |
1121 | return r; |
1122 | } | |
1123 | ||
822a5960 | 1124 | static int apply_address_families(const ExecContext *c) { |
4298d0b5 LP |
1125 | scmp_filter_ctx *seccomp; |
1126 | Iterator i; | |
1127 | int r; | |
1128 | ||
1129 | assert(c); | |
1130 | ||
1131 | seccomp = seccomp_init(SCMP_ACT_ALLOW); | |
1132 | if (!seccomp) | |
1133 | return -ENOMEM; | |
1134 | ||
1135 | r = seccomp_add_secondary_archs(seccomp); | |
1136 | if (r < 0) | |
1137 | goto finish; | |
1138 | ||
1139 | if (c->address_families_whitelist) { | |
1140 | int af, first = 0, last = 0; | |
1141 | void *afp; | |
1142 | ||
1143 | /* If this is a whitelist, we first block the address | |
1144 | * families that are out of range and then everything | |
1145 | * that is not in the set. First, we find the lowest | |
1146 | * and highest address family in the set. */ | |
1147 | ||
1148 | SET_FOREACH(afp, c->address_families, i) { | |
1149 | af = PTR_TO_INT(afp); | |
17df7223 | 1150 | |
4298d0b5 LP |
1151 | if (af <= 0 || af >= af_max()) |
1152 | continue; | |
1153 | ||
1154 | if (first == 0 || af < first) | |
1155 | first = af; | |
1156 | ||
1157 | if (last == 0 || af > last) | |
1158 | last = af; | |
1159 | } | |
1160 | ||
1161 | assert((first == 0) == (last == 0)); | |
1162 | ||
1163 | if (first == 0) { | |
1164 | ||
1165 | /* No entries in the valid range, block everything */ | |
1166 | r = seccomp_rule_add( | |
1167 | seccomp, | |
1168 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1169 | SCMP_SYS(socket), | |
1170 | 0); | |
1171 | if (r < 0) | |
1172 | goto finish; | |
1173 | ||
1174 | } else { | |
1175 | ||
1176 | /* Block everything below the first entry */ | |
1177 | r = seccomp_rule_add( | |
1178 | seccomp, | |
1179 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1180 | SCMP_SYS(socket), | |
1181 | 1, | |
1182 | SCMP_A0(SCMP_CMP_LT, first)); | |
1183 | if (r < 0) | |
1184 | goto finish; | |
1185 | ||
1186 | /* Block everything above the last entry */ | |
1187 | r = seccomp_rule_add( | |
1188 | seccomp, | |
1189 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1190 | SCMP_SYS(socket), | |
1191 | 1, | |
1192 | SCMP_A0(SCMP_CMP_GT, last)); | |
1193 | if (r < 0) | |
1194 | goto finish; | |
1195 | ||
1196 | /* Block everything between the first and last | |
1197 | * entry */ | |
1198 | for (af = 1; af < af_max(); af++) { | |
1199 | ||
1200 | if (set_contains(c->address_families, INT_TO_PTR(af))) | |
1201 | continue; | |
1202 | ||
1203 | r = seccomp_rule_add( | |
1204 | seccomp, | |
1205 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1206 | SCMP_SYS(socket), | |
1207 | 1, | |
1208 | SCMP_A0(SCMP_CMP_EQ, af)); | |
1209 | if (r < 0) | |
1210 | goto finish; | |
1211 | } | |
1212 | } | |
1213 | ||
1214 | } else { | |
1215 | void *af; | |
1216 | ||
1217 | /* If this is a blacklist, then generate one rule for | |
1218 | * each address family that are then combined in OR | |
1219 | * checks. */ | |
1220 | ||
1221 | SET_FOREACH(af, c->address_families, i) { | |
1222 | ||
1223 | r = seccomp_rule_add( | |
1224 | seccomp, | |
1225 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1226 | SCMP_SYS(socket), | |
1227 | 1, | |
1228 | SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af))); | |
1229 | if (r < 0) | |
1230 | goto finish; | |
1231 | } | |
1232 | } | |
1233 | ||
1234 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1235 | if (r < 0) | |
1236 | goto finish; | |
1237 | ||
1238 | r = seccomp_load(seccomp); | |
1239 | ||
1240 | finish: | |
1241 | seccomp_release(seccomp); | |
17df7223 | 1242 | return r; |
8351ceae | 1243 | } |
4298d0b5 | 1244 | |
f3e43635 TM |
1245 | static int apply_memory_deny_write_execute(const ExecContext *c) { |
1246 | scmp_filter_ctx *seccomp; | |
1247 | int r; | |
1248 | ||
1249 | assert(c); | |
1250 | ||
1251 | seccomp = seccomp_init(SCMP_ACT_ALLOW); | |
1252 | if (!seccomp) | |
1253 | return -ENOMEM; | |
1254 | ||
1255 | r = seccomp_rule_add( | |
1256 | seccomp, | |
abd84d4d | 1257 | SCMP_ACT_ERRNO(EPERM), |
f3e43635 TM |
1258 | SCMP_SYS(mmap), |
1259 | 1, | |
1260 | SCMP_A2(SCMP_CMP_MASKED_EQ, PROT_EXEC|PROT_WRITE, PROT_EXEC|PROT_WRITE)); | |
1261 | if (r < 0) | |
1262 | goto finish; | |
1263 | ||
1264 | r = seccomp_rule_add( | |
1265 | seccomp, | |
abd84d4d | 1266 | SCMP_ACT_ERRNO(EPERM), |
f3e43635 TM |
1267 | SCMP_SYS(mprotect), |
1268 | 1, | |
1269 | SCMP_A2(SCMP_CMP_MASKED_EQ, PROT_EXEC, PROT_EXEC)); | |
1270 | if (r < 0) | |
1271 | goto finish; | |
1272 | ||
1273 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1274 | if (r < 0) | |
1275 | goto finish; | |
1276 | ||
1277 | r = seccomp_load(seccomp); | |
1278 | ||
1279 | finish: | |
1280 | seccomp_release(seccomp); | |
1281 | return r; | |
1282 | } | |
1283 | ||
f4170c67 LP |
1284 | static int apply_restrict_realtime(const ExecContext *c) { |
1285 | static const int permitted_policies[] = { | |
1286 | SCHED_OTHER, | |
1287 | SCHED_BATCH, | |
1288 | SCHED_IDLE, | |
1289 | }; | |
1290 | ||
1291 | scmp_filter_ctx *seccomp; | |
1292 | unsigned i; | |
1293 | int r, p, max_policy = 0; | |
1294 | ||
1295 | assert(c); | |
1296 | ||
1297 | seccomp = seccomp_init(SCMP_ACT_ALLOW); | |
1298 | if (!seccomp) | |
1299 | return -ENOMEM; | |
1300 | ||
1301 | /* Determine the highest policy constant we want to allow */ | |
1302 | for (i = 0; i < ELEMENTSOF(permitted_policies); i++) | |
1303 | if (permitted_policies[i] > max_policy) | |
1304 | max_policy = permitted_policies[i]; | |
1305 | ||
1306 | /* Go through all policies with lower values than that, and block them -- unless they appear in the | |
1307 | * whitelist. */ | |
1308 | for (p = 0; p < max_policy; p++) { | |
1309 | bool good = false; | |
1310 | ||
1311 | /* Check if this is in the whitelist. */ | |
1312 | for (i = 0; i < ELEMENTSOF(permitted_policies); i++) | |
1313 | if (permitted_policies[i] == p) { | |
1314 | good = true; | |
1315 | break; | |
1316 | } | |
1317 | ||
1318 | if (good) | |
1319 | continue; | |
1320 | ||
1321 | /* Deny this policy */ | |
1322 | r = seccomp_rule_add( | |
1323 | seccomp, | |
1324 | SCMP_ACT_ERRNO(EPERM), | |
1325 | SCMP_SYS(sched_setscheduler), | |
1326 | 1, | |
1327 | SCMP_A1(SCMP_CMP_EQ, p)); | |
1328 | if (r < 0) | |
1329 | goto finish; | |
1330 | } | |
1331 | ||
1332 | /* Blacklist all other policies, i.e. the ones with higher values. Note that all comparisons are unsigned here, | |
1333 | * hence no need no check for < 0 values. */ | |
1334 | r = seccomp_rule_add( | |
1335 | seccomp, | |
1336 | SCMP_ACT_ERRNO(EPERM), | |
1337 | SCMP_SYS(sched_setscheduler), | |
1338 | 1, | |
1339 | SCMP_A1(SCMP_CMP_GT, max_policy)); | |
1340 | if (r < 0) | |
1341 | goto finish; | |
1342 | ||
1343 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1344 | if (r < 0) | |
1345 | goto finish; | |
1346 | ||
1347 | r = seccomp_load(seccomp); | |
1348 | ||
1349 | finish: | |
1350 | seccomp_release(seccomp); | |
1351 | return r; | |
1352 | } | |
1353 | ||
c0467cf3 | 1354 | #endif |
8351ceae | 1355 | |
31a7eb86 ZJS |
1356 | static void do_idle_pipe_dance(int idle_pipe[4]) { |
1357 | assert(idle_pipe); | |
1358 | ||
03e334a1 | 1359 | |
54eb2300 LP |
1360 | idle_pipe[1] = safe_close(idle_pipe[1]); |
1361 | idle_pipe[2] = safe_close(idle_pipe[2]); | |
31a7eb86 ZJS |
1362 | |
1363 | if (idle_pipe[0] >= 0) { | |
1364 | int r; | |
1365 | ||
1366 | r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC); | |
1367 | ||
1368 | if (idle_pipe[3] >= 0 && r == 0 /* timeout */) { | |
c7cc737f LP |
1369 | ssize_t n; |
1370 | ||
31a7eb86 | 1371 | /* Signal systemd that we are bored and want to continue. */ |
c7cc737f LP |
1372 | n = write(idle_pipe[3], "x", 1); |
1373 | if (n > 0) | |
cd972d69 ZJS |
1374 | /* Wait for systemd to react to the signal above. */ |
1375 | fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC); | |
31a7eb86 ZJS |
1376 | } |
1377 | ||
54eb2300 | 1378 | idle_pipe[0] = safe_close(idle_pipe[0]); |
31a7eb86 ZJS |
1379 | |
1380 | } | |
1381 | ||
54eb2300 | 1382 | idle_pipe[3] = safe_close(idle_pipe[3]); |
31a7eb86 ZJS |
1383 | } |
1384 | ||
7cae38c4 | 1385 | static int build_environment( |
9fa95f85 | 1386 | const ExecContext *c, |
1e22b5cd | 1387 | const ExecParameters *p, |
7cae38c4 LP |
1388 | unsigned n_fds, |
1389 | const char *home, | |
1390 | const char *username, | |
1391 | const char *shell, | |
7bce046b LP |
1392 | dev_t journal_stream_dev, |
1393 | ino_t journal_stream_ino, | |
7cae38c4 LP |
1394 | char ***ret) { |
1395 | ||
1396 | _cleanup_strv_free_ char **our_env = NULL; | |
1397 | unsigned n_env = 0; | |
1398 | char *x; | |
1399 | ||
1400 | assert(c); | |
1401 | assert(ret); | |
1402 | ||
7bce046b | 1403 | our_env = new0(char*, 12); |
7cae38c4 LP |
1404 | if (!our_env) |
1405 | return -ENOMEM; | |
1406 | ||
1407 | if (n_fds > 0) { | |
8dd4c05b LP |
1408 | _cleanup_free_ char *joined = NULL; |
1409 | ||
ccd06097 | 1410 | if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0) |
7cae38c4 LP |
1411 | return -ENOMEM; |
1412 | our_env[n_env++] = x; | |
1413 | ||
1414 | if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0) | |
1415 | return -ENOMEM; | |
1416 | our_env[n_env++] = x; | |
8dd4c05b | 1417 | |
1e22b5cd | 1418 | joined = strv_join(p->fd_names, ":"); |
8dd4c05b LP |
1419 | if (!joined) |
1420 | return -ENOMEM; | |
1421 | ||
1422 | x = strjoin("LISTEN_FDNAMES=", joined, NULL); | |
1423 | if (!x) | |
1424 | return -ENOMEM; | |
1425 | our_env[n_env++] = x; | |
7cae38c4 LP |
1426 | } |
1427 | ||
1e22b5cd | 1428 | if (p->watchdog_usec > 0) { |
ccd06097 | 1429 | if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0) |
09812eb7 LP |
1430 | return -ENOMEM; |
1431 | our_env[n_env++] = x; | |
1432 | ||
1e22b5cd | 1433 | if (asprintf(&x, "WATCHDOG_USEC="USEC_FMT, p->watchdog_usec) < 0) |
09812eb7 LP |
1434 | return -ENOMEM; |
1435 | our_env[n_env++] = x; | |
1436 | } | |
1437 | ||
7cae38c4 LP |
1438 | if (home) { |
1439 | x = strappend("HOME=", home); | |
1440 | if (!x) | |
1441 | return -ENOMEM; | |
1442 | our_env[n_env++] = x; | |
1443 | } | |
1444 | ||
1445 | if (username) { | |
1446 | x = strappend("LOGNAME=", username); | |
1447 | if (!x) | |
1448 | return -ENOMEM; | |
1449 | our_env[n_env++] = x; | |
1450 | ||
1451 | x = strappend("USER=", username); | |
1452 | if (!x) | |
1453 | return -ENOMEM; | |
1454 | our_env[n_env++] = x; | |
1455 | } | |
1456 | ||
1457 | if (shell) { | |
1458 | x = strappend("SHELL=", shell); | |
1459 | if (!x) | |
1460 | return -ENOMEM; | |
1461 | our_env[n_env++] = x; | |
1462 | } | |
1463 | ||
6af760f3 LP |
1464 | if (exec_context_needs_term(c)) { |
1465 | const char *tty_path, *term = NULL; | |
1466 | ||
1467 | tty_path = exec_context_tty_path(c); | |
1468 | ||
1469 | /* If we are forked off PID 1 and we are supposed to operate on /dev/console, then let's try to inherit | |
1470 | * the $TERM set for PID 1. This is useful for containers so that the $TERM the container manager | |
1471 | * passes to PID 1 ends up all the way in the console login shown. */ | |
1472 | ||
1473 | if (path_equal(tty_path, "/dev/console") && getppid() == 1) | |
1474 | term = getenv("TERM"); | |
1475 | if (!term) | |
1476 | term = default_term_for_tty(tty_path); | |
7cae38c4 | 1477 | |
6af760f3 | 1478 | x = strappend("TERM=", term); |
7cae38c4 LP |
1479 | if (!x) |
1480 | return -ENOMEM; | |
1481 | our_env[n_env++] = x; | |
1482 | } | |
1483 | ||
7bce046b LP |
1484 | if (journal_stream_dev != 0 && journal_stream_ino != 0) { |
1485 | if (asprintf(&x, "JOURNAL_STREAM=" DEV_FMT ":" INO_FMT, journal_stream_dev, journal_stream_ino) < 0) | |
1486 | return -ENOMEM; | |
1487 | ||
1488 | our_env[n_env++] = x; | |
1489 | } | |
1490 | ||
7cae38c4 | 1491 | our_env[n_env++] = NULL; |
7bce046b | 1492 | assert(n_env <= 12); |
7cae38c4 LP |
1493 | |
1494 | *ret = our_env; | |
1495 | our_env = NULL; | |
1496 | ||
1497 | return 0; | |
1498 | } | |
1499 | ||
b4c14404 FB |
1500 | static int build_pass_environment(const ExecContext *c, char ***ret) { |
1501 | _cleanup_strv_free_ char **pass_env = NULL; | |
1502 | size_t n_env = 0, n_bufsize = 0; | |
1503 | char **i; | |
1504 | ||
1505 | STRV_FOREACH(i, c->pass_environment) { | |
1506 | _cleanup_free_ char *x = NULL; | |
1507 | char *v; | |
1508 | ||
1509 | v = getenv(*i); | |
1510 | if (!v) | |
1511 | continue; | |
1512 | x = strjoin(*i, "=", v, NULL); | |
1513 | if (!x) | |
1514 | return -ENOMEM; | |
1515 | if (!GREEDY_REALLOC(pass_env, n_bufsize, n_env + 2)) | |
1516 | return -ENOMEM; | |
1517 | pass_env[n_env++] = x; | |
1518 | pass_env[n_env] = NULL; | |
1519 | x = NULL; | |
1520 | } | |
1521 | ||
1522 | *ret = pass_env; | |
1523 | pass_env = NULL; | |
1524 | ||
1525 | return 0; | |
1526 | } | |
1527 | ||
8b44a3d2 LP |
1528 | static bool exec_needs_mount_namespace( |
1529 | const ExecContext *context, | |
1530 | const ExecParameters *params, | |
1531 | ExecRuntime *runtime) { | |
1532 | ||
1533 | assert(context); | |
1534 | assert(params); | |
1535 | ||
2a624c36 AP |
1536 | if (!strv_isempty(context->read_write_paths) || |
1537 | !strv_isempty(context->read_only_paths) || | |
1538 | !strv_isempty(context->inaccessible_paths)) | |
8b44a3d2 LP |
1539 | return true; |
1540 | ||
1541 | if (context->mount_flags != 0) | |
1542 | return true; | |
1543 | ||
1544 | if (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) | |
1545 | return true; | |
1546 | ||
8b44a3d2 LP |
1547 | if (context->private_devices || |
1548 | context->protect_system != PROTECT_SYSTEM_NO || | |
1549 | context->protect_home != PROTECT_HOME_NO) | |
1550 | return true; | |
1551 | ||
1552 | return false; | |
1553 | } | |
1554 | ||
29206d46 LP |
1555 | static void append_socket_pair(int *array, unsigned *n, int pair[2]) { |
1556 | assert(array); | |
1557 | assert(n); | |
1558 | ||
1559 | if (!pair) | |
1560 | return; | |
1561 | ||
1562 | if (pair[0] >= 0) | |
1563 | array[(*n)++] = pair[0]; | |
1564 | if (pair[1] >= 0) | |
1565 | array[(*n)++] = pair[1]; | |
1566 | } | |
1567 | ||
a34ceba6 LP |
1568 | static int close_remaining_fds( |
1569 | const ExecParameters *params, | |
1570 | ExecRuntime *runtime, | |
29206d46 | 1571 | DynamicCreds *dcreds, |
a34ceba6 LP |
1572 | int socket_fd, |
1573 | int *fds, unsigned n_fds) { | |
1574 | ||
1575 | unsigned n_dont_close = 0; | |
29206d46 | 1576 | int dont_close[n_fds + 11]; |
a34ceba6 LP |
1577 | |
1578 | assert(params); | |
1579 | ||
1580 | if (params->stdin_fd >= 0) | |
1581 | dont_close[n_dont_close++] = params->stdin_fd; | |
1582 | if (params->stdout_fd >= 0) | |
1583 | dont_close[n_dont_close++] = params->stdout_fd; | |
1584 | if (params->stderr_fd >= 0) | |
1585 | dont_close[n_dont_close++] = params->stderr_fd; | |
1586 | ||
1587 | if (socket_fd >= 0) | |
1588 | dont_close[n_dont_close++] = socket_fd; | |
1589 | if (n_fds > 0) { | |
1590 | memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds); | |
1591 | n_dont_close += n_fds; | |
1592 | } | |
1593 | ||
29206d46 LP |
1594 | if (runtime) |
1595 | append_socket_pair(dont_close, &n_dont_close, runtime->netns_storage_socket); | |
1596 | ||
1597 | if (dcreds) { | |
1598 | if (dcreds->user) | |
1599 | append_socket_pair(dont_close, &n_dont_close, dcreds->user->storage_socket); | |
1600 | if (dcreds->group) | |
1601 | append_socket_pair(dont_close, &n_dont_close, dcreds->group->storage_socket); | |
a34ceba6 LP |
1602 | } |
1603 | ||
1604 | return close_all_fds(dont_close, n_dont_close); | |
1605 | } | |
1606 | ||
ff0af2a1 | 1607 | static int exec_child( |
f2341e0a | 1608 | Unit *unit, |
ff0af2a1 LP |
1609 | ExecCommand *command, |
1610 | const ExecContext *context, | |
1611 | const ExecParameters *params, | |
1612 | ExecRuntime *runtime, | |
29206d46 | 1613 | DynamicCreds *dcreds, |
ff0af2a1 LP |
1614 | char **argv, |
1615 | int socket_fd, | |
1616 | int *fds, unsigned n_fds, | |
1617 | char **files_env, | |
1618 | int *exit_status) { | |
d35fbf6b | 1619 | |
2065ca69 | 1620 | _cleanup_strv_free_ char **our_env = NULL, **pass_env = NULL, **accum_env = NULL, **final_argv = NULL; |
9008e1ac | 1621 | _cleanup_free_ char *mac_selinux_context_net = NULL; |
5f5d8eab | 1622 | const char *username = NULL, *home = NULL, *shell = NULL, *wd; |
7bce046b LP |
1623 | dev_t journal_stream_dev = 0; |
1624 | ino_t journal_stream_ino = 0; | |
1625 | bool needs_mount_namespace; | |
fed1e721 LP |
1626 | uid_t uid = UID_INVALID; |
1627 | gid_t gid = GID_INVALID; | |
ff0af2a1 | 1628 | int i, r; |
034c6ed7 | 1629 | |
f2341e0a | 1630 | assert(unit); |
5cb5a6ff LP |
1631 | assert(command); |
1632 | assert(context); | |
d35fbf6b | 1633 | assert(params); |
ff0af2a1 | 1634 | assert(exit_status); |
d35fbf6b DM |
1635 | |
1636 | rename_process_from_path(command->path); | |
1637 | ||
1638 | /* We reset exactly these signals, since they are the | |
1639 | * only ones we set to SIG_IGN in the main daemon. All | |
1640 | * others we leave untouched because we set them to | |
1641 | * SIG_DFL or a valid handler initially, both of which | |
1642 | * will be demoted to SIG_DFL. */ | |
ce30c8dc LP |
1643 | (void) default_signals(SIGNALS_CRASH_HANDLER, |
1644 | SIGNALS_IGNORE, -1); | |
d35fbf6b DM |
1645 | |
1646 | if (context->ignore_sigpipe) | |
ce30c8dc | 1647 | (void) ignore_signals(SIGPIPE, -1); |
d35fbf6b | 1648 | |
ff0af2a1 LP |
1649 | r = reset_signal_mask(); |
1650 | if (r < 0) { | |
1651 | *exit_status = EXIT_SIGNAL_MASK; | |
1652 | return r; | |
d35fbf6b | 1653 | } |
034c6ed7 | 1654 | |
d35fbf6b DM |
1655 | if (params->idle_pipe) |
1656 | do_idle_pipe_dance(params->idle_pipe); | |
4f2d528d | 1657 | |
d35fbf6b DM |
1658 | /* Close sockets very early to make sure we don't |
1659 | * block init reexecution because it cannot bind its | |
1660 | * sockets */ | |
ff0af2a1 | 1661 | |
d35fbf6b | 1662 | log_forget_fds(); |
4f2d528d | 1663 | |
29206d46 | 1664 | r = close_remaining_fds(params, runtime, dcreds, socket_fd, fds, n_fds); |
ff0af2a1 LP |
1665 | if (r < 0) { |
1666 | *exit_status = EXIT_FDS; | |
1667 | return r; | |
8c7be95e LP |
1668 | } |
1669 | ||
d35fbf6b DM |
1670 | if (!context->same_pgrp) |
1671 | if (setsid() < 0) { | |
ff0af2a1 | 1672 | *exit_status = EXIT_SETSID; |
d35fbf6b DM |
1673 | return -errno; |
1674 | } | |
9e2f7c11 | 1675 | |
1e22b5cd | 1676 | exec_context_tty_reset(context, params); |
d35fbf6b | 1677 | |
c39f1ce2 | 1678 | if (params->flags & EXEC_CONFIRM_SPAWN) { |
d35fbf6b DM |
1679 | char response; |
1680 | ||
ff0af2a1 LP |
1681 | r = ask_for_confirmation(&response, argv); |
1682 | if (r == -ETIMEDOUT) | |
d35fbf6b | 1683 | write_confirm_message("Confirmation question timed out, assuming positive response.\n"); |
ff0af2a1 LP |
1684 | else if (r < 0) |
1685 | write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-r)); | |
d35fbf6b DM |
1686 | else if (response == 's') { |
1687 | write_confirm_message("Skipping execution.\n"); | |
ff0af2a1 | 1688 | *exit_status = EXIT_CONFIRM; |
d35fbf6b DM |
1689 | return -ECANCELED; |
1690 | } else if (response == 'n') { | |
1691 | write_confirm_message("Failing execution.\n"); | |
ff0af2a1 | 1692 | *exit_status = 0; |
d35fbf6b DM |
1693 | return 0; |
1694 | } | |
1695 | } | |
1a63a750 | 1696 | |
29206d46 LP |
1697 | if (context->dynamic_user && dcreds) { |
1698 | ||
409093fe LP |
1699 | /* Make sure we bypass our own NSS module for any NSS checks */ |
1700 | if (putenv((char*) "SYSTEMD_NSS_DYNAMIC_BYPASS=1") != 0) { | |
1701 | *exit_status = EXIT_USER; | |
1702 | return -errno; | |
1703 | } | |
1704 | ||
29206d46 | 1705 | r = dynamic_creds_realize(dcreds, &uid, &gid); |
ff0af2a1 LP |
1706 | if (r < 0) { |
1707 | *exit_status = EXIT_USER; | |
1708 | return r; | |
524daa8c | 1709 | } |
524daa8c | 1710 | |
29206d46 LP |
1711 | if (uid == UID_INVALID || gid == GID_INVALID) { |
1712 | *exit_status = EXIT_USER; | |
1713 | return -ESRCH; | |
1714 | } | |
5bc7452b | 1715 | |
29206d46 LP |
1716 | if (dcreds->user) |
1717 | username = dcreds->user->name; | |
1718 | ||
1719 | } else { | |
1720 | if (context->user) { | |
1721 | username = context->user; | |
1722 | r = get_user_creds(&username, &uid, &gid, &home, &shell); | |
1723 | if (r < 0) { | |
1724 | *exit_status = EXIT_USER; | |
1725 | return r; | |
1726 | } | |
70493828 LP |
1727 | |
1728 | /* Don't set $HOME or $SHELL if they are are not particularly enlightening anyway. */ | |
1729 | if (isempty(home) || path_equal(home, "/")) | |
1730 | home = NULL; | |
1731 | ||
1732 | if (isempty(shell) || PATH_IN_SET(shell, | |
1733 | "/bin/nologin", | |
1734 | "/sbin/nologin", | |
1735 | "/usr/bin/nologin", | |
1736 | "/usr/sbin/nologin")) | |
1737 | shell = NULL; | |
5bc7452b | 1738 | } |
5bc7452b | 1739 | |
29206d46 LP |
1740 | if (context->group) { |
1741 | const char *g = context->group; | |
1742 | ||
1743 | r = get_group_creds(&g, &gid); | |
1744 | if (r < 0) { | |
1745 | *exit_status = EXIT_GROUP; | |
1746 | return r; | |
1747 | } | |
1748 | } | |
1749 | } | |
5bc7452b | 1750 | |
d35fbf6b DM |
1751 | /* If a socket is connected to STDIN/STDOUT/STDERR, we |
1752 | * must sure to drop O_NONBLOCK */ | |
1753 | if (socket_fd >= 0) | |
a34ceba6 | 1754 | (void) fd_nonblock(socket_fd, false); |
acbb0225 | 1755 | |
a34ceba6 | 1756 | r = setup_input(context, params, socket_fd); |
ff0af2a1 LP |
1757 | if (r < 0) { |
1758 | *exit_status = EXIT_STDIN; | |
1759 | return r; | |
d35fbf6b | 1760 | } |
034c6ed7 | 1761 | |
7bce046b | 1762 | r = setup_output(unit, context, params, STDOUT_FILENO, socket_fd, basename(command->path), uid, gid, &journal_stream_dev, &journal_stream_ino); |
ff0af2a1 LP |
1763 | if (r < 0) { |
1764 | *exit_status = EXIT_STDOUT; | |
1765 | return r; | |
d35fbf6b DM |
1766 | } |
1767 | ||
7bce046b | 1768 | r = setup_output(unit, context, params, STDERR_FILENO, socket_fd, basename(command->path), uid, gid, &journal_stream_dev, &journal_stream_ino); |
ff0af2a1 LP |
1769 | if (r < 0) { |
1770 | *exit_status = EXIT_STDERR; | |
1771 | return r; | |
d35fbf6b DM |
1772 | } |
1773 | ||
1774 | if (params->cgroup_path) { | |
ff0af2a1 LP |
1775 | r = cg_attach_everywhere(params->cgroup_supported, params->cgroup_path, 0, NULL, NULL); |
1776 | if (r < 0) { | |
1777 | *exit_status = EXIT_CGROUP; | |
1778 | return r; | |
309bff19 | 1779 | } |
d35fbf6b | 1780 | } |
309bff19 | 1781 | |
d35fbf6b | 1782 | if (context->oom_score_adjust_set) { |
d5243d62 | 1783 | char t[DECIMAL_STR_MAX(context->oom_score_adjust)]; |
f2b68789 | 1784 | |
d5243d62 LP |
1785 | /* When we can't make this change due to EPERM, then |
1786 | * let's silently skip over it. User namespaces | |
1787 | * prohibit write access to this file, and we | |
1788 | * shouldn't trip up over that. */ | |
613b411c | 1789 | |
d5243d62 | 1790 | sprintf(t, "%i", context->oom_score_adjust); |
ad118bda | 1791 | r = write_string_file("/proc/self/oom_score_adj", t, 0); |
6cb7fa17 | 1792 | if (r == -EPERM || r == -EACCES) { |
ff0af2a1 | 1793 | log_open(); |
f2341e0a | 1794 | log_unit_debug_errno(unit, r, "Failed to adjust OOM setting, assuming containerized execution, ignoring: %m"); |
ff0af2a1 LP |
1795 | log_close(); |
1796 | } else if (r < 0) { | |
1797 | *exit_status = EXIT_OOM_ADJUST; | |
d35fbf6b | 1798 | return -errno; |
613b411c | 1799 | } |
d35fbf6b DM |
1800 | } |
1801 | ||
1802 | if (context->nice_set) | |
1803 | if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) { | |
ff0af2a1 | 1804 | *exit_status = EXIT_NICE; |
d35fbf6b | 1805 | return -errno; |
613b411c LP |
1806 | } |
1807 | ||
d35fbf6b DM |
1808 | if (context->cpu_sched_set) { |
1809 | struct sched_param param = { | |
1810 | .sched_priority = context->cpu_sched_priority, | |
1811 | }; | |
1812 | ||
ff0af2a1 LP |
1813 | r = sched_setscheduler(0, |
1814 | context->cpu_sched_policy | | |
1815 | (context->cpu_sched_reset_on_fork ? | |
1816 | SCHED_RESET_ON_FORK : 0), | |
1817 | ¶m); | |
1818 | if (r < 0) { | |
1819 | *exit_status = EXIT_SETSCHEDULER; | |
d35fbf6b | 1820 | return -errno; |
fc9b2a84 | 1821 | } |
d35fbf6b | 1822 | } |
fc9b2a84 | 1823 | |
d35fbf6b DM |
1824 | if (context->cpuset) |
1825 | if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) { | |
ff0af2a1 | 1826 | *exit_status = EXIT_CPUAFFINITY; |
d35fbf6b | 1827 | return -errno; |
034c6ed7 LP |
1828 | } |
1829 | ||
d35fbf6b DM |
1830 | if (context->ioprio_set) |
1831 | if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) { | |
ff0af2a1 | 1832 | *exit_status = EXIT_IOPRIO; |
d35fbf6b DM |
1833 | return -errno; |
1834 | } | |
da726a4d | 1835 | |
d35fbf6b DM |
1836 | if (context->timer_slack_nsec != NSEC_INFINITY) |
1837 | if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) { | |
ff0af2a1 | 1838 | *exit_status = EXIT_TIMERSLACK; |
d35fbf6b | 1839 | return -errno; |
4c2630eb | 1840 | } |
9eba9da4 | 1841 | |
050f7277 | 1842 | if (context->personality != PERSONALITY_INVALID) |
d35fbf6b | 1843 | if (personality(context->personality) < 0) { |
ff0af2a1 | 1844 | *exit_status = EXIT_PERSONALITY; |
d35fbf6b | 1845 | return -errno; |
4c2630eb | 1846 | } |
94f04347 | 1847 | |
d35fbf6b | 1848 | if (context->utmp_id) |
023a4f67 LP |
1849 | utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path, |
1850 | context->utmp_mode == EXEC_UTMP_INIT ? INIT_PROCESS : | |
1851 | context->utmp_mode == EXEC_UTMP_LOGIN ? LOGIN_PROCESS : | |
1852 | USER_PROCESS, | |
1853 | username ? "root" : context->user); | |
d35fbf6b | 1854 | |
524daa8c | 1855 | if (context->user && is_terminal_input(context->std_input)) { |
ff0af2a1 LP |
1856 | r = chown_terminal(STDIN_FILENO, uid); |
1857 | if (r < 0) { | |
1858 | *exit_status = EXIT_STDIN; | |
1859 | return r; | |
071830ff | 1860 | } |
d35fbf6b | 1861 | } |
8e274523 | 1862 | |
a931ad47 LP |
1863 | /* If delegation is enabled we'll pass ownership of the cgroup |
1864 | * (but only in systemd's own controller hierarchy!) to the | |
1865 | * user of the new process. */ | |
1866 | if (params->cgroup_path && context->user && params->cgroup_delegate) { | |
ff0af2a1 LP |
1867 | r = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0644, uid, gid); |
1868 | if (r < 0) { | |
1869 | *exit_status = EXIT_CGROUP; | |
1870 | return r; | |
d35fbf6b | 1871 | } |
034c6ed7 | 1872 | |
034c6ed7 | 1873 | |
ff0af2a1 LP |
1874 | r = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0755, uid, gid); |
1875 | if (r < 0) { | |
1876 | *exit_status = EXIT_CGROUP; | |
1877 | return r; | |
034c6ed7 | 1878 | } |
d35fbf6b | 1879 | } |
034c6ed7 | 1880 | |
d35fbf6b DM |
1881 | if (!strv_isempty(context->runtime_directory) && params->runtime_prefix) { |
1882 | char **rt; | |
fb33a393 | 1883 | |
d35fbf6b DM |
1884 | STRV_FOREACH(rt, context->runtime_directory) { |
1885 | _cleanup_free_ char *p; | |
94f04347 | 1886 | |
d35fbf6b DM |
1887 | p = strjoin(params->runtime_prefix, "/", *rt, NULL); |
1888 | if (!p) { | |
ff0af2a1 | 1889 | *exit_status = EXIT_RUNTIME_DIRECTORY; |
d35fbf6b | 1890 | return -ENOMEM; |
94f04347 | 1891 | } |
94f04347 | 1892 | |
6bfe5c28 LP |
1893 | r = mkdir_p_label(p, context->runtime_directory_mode); |
1894 | if (r < 0) { | |
1895 | *exit_status = EXIT_RUNTIME_DIRECTORY; | |
1896 | return r; | |
1897 | } | |
1898 | ||
1899 | r = chmod_and_chown(p, context->runtime_directory_mode, uid, gid); | |
ff0af2a1 LP |
1900 | if (r < 0) { |
1901 | *exit_status = EXIT_RUNTIME_DIRECTORY; | |
1902 | return r; | |
94f04347 | 1903 | } |
d35fbf6b DM |
1904 | } |
1905 | } | |
94f04347 | 1906 | |
7bce046b LP |
1907 | r = build_environment( |
1908 | context, | |
1909 | params, | |
1910 | n_fds, | |
1911 | home, | |
1912 | username, | |
1913 | shell, | |
1914 | journal_stream_dev, | |
1915 | journal_stream_ino, | |
1916 | &our_env); | |
2065ca69 JW |
1917 | if (r < 0) { |
1918 | *exit_status = EXIT_MEMORY; | |
1919 | return r; | |
1920 | } | |
1921 | ||
1922 | r = build_pass_environment(context, &pass_env); | |
1923 | if (r < 0) { | |
1924 | *exit_status = EXIT_MEMORY; | |
1925 | return r; | |
1926 | } | |
1927 | ||
1928 | accum_env = strv_env_merge(5, | |
1929 | params->environment, | |
1930 | our_env, | |
1931 | pass_env, | |
1932 | context->environment, | |
1933 | files_env, | |
1934 | NULL); | |
1935 | if (!accum_env) { | |
1936 | *exit_status = EXIT_MEMORY; | |
1937 | return -ENOMEM; | |
1938 | } | |
1280503b | 1939 | accum_env = strv_env_clean(accum_env); |
2065ca69 | 1940 | |
b213e1c1 SW |
1941 | umask(context->umask); |
1942 | ||
c39f1ce2 | 1943 | if ((params->flags & EXEC_APPLY_PERMISSIONS) && !command->privileged) { |
ff0af2a1 LP |
1944 | r = enforce_groups(context, username, gid); |
1945 | if (r < 0) { | |
1946 | *exit_status = EXIT_GROUP; | |
1947 | return r; | |
d35fbf6b | 1948 | } |
6bf6e43e | 1949 | #ifdef HAVE_SMACK |
6bf6e43e SW |
1950 | if (context->smack_process_label) { |
1951 | r = mac_smack_apply_pid(0, context->smack_process_label); | |
1952 | if (r < 0) { | |
1953 | *exit_status = EXIT_SMACK_PROCESS_LABEL; | |
1954 | return r; | |
1955 | } | |
1956 | } | |
1957 | #ifdef SMACK_DEFAULT_PROCESS_LABEL | |
1958 | else { | |
1959 | _cleanup_free_ char *exec_label = NULL; | |
1960 | ||
1961 | r = mac_smack_read(command->path, SMACK_ATTR_EXEC, &exec_label); | |
1962 | if (r < 0 && r != -ENODATA && r != -EOPNOTSUPP) { | |
1963 | *exit_status = EXIT_SMACK_PROCESS_LABEL; | |
1964 | return r; | |
1965 | } | |
1966 | ||
1967 | r = mac_smack_apply_pid(0, exec_label ? : SMACK_DEFAULT_PROCESS_LABEL); | |
1968 | if (r < 0) { | |
1969 | *exit_status = EXIT_SMACK_PROCESS_LABEL; | |
1970 | return r; | |
1971 | } | |
1972 | } | |
6bf6e43e SW |
1973 | #endif |
1974 | #endif | |
d35fbf6b | 1975 | #ifdef HAVE_PAM |
b213e1c1 | 1976 | if (context->pam_name && username) { |
2065ca69 | 1977 | r = setup_pam(context->pam_name, username, uid, context->tty_path, &accum_env, fds, n_fds); |
b213e1c1 SW |
1978 | if (r < 0) { |
1979 | *exit_status = EXIT_PAM; | |
1980 | return r; | |
1981 | } | |
d35fbf6b | 1982 | } |
d35fbf6b | 1983 | #endif |
b213e1c1 | 1984 | } |
ac45f971 | 1985 | |
d35fbf6b | 1986 | if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) { |
ff0af2a1 LP |
1987 | r = setup_netns(runtime->netns_storage_socket); |
1988 | if (r < 0) { | |
1989 | *exit_status = EXIT_NETWORK; | |
1990 | return r; | |
d35fbf6b DM |
1991 | } |
1992 | } | |
169c1bda | 1993 | |
ee818b89 AC |
1994 | needs_mount_namespace = exec_needs_mount_namespace(context, params, runtime); |
1995 | ||
1996 | if (needs_mount_namespace) { | |
d35fbf6b DM |
1997 | char *tmp = NULL, *var = NULL; |
1998 | ||
1999 | /* The runtime struct only contains the parent | |
2000 | * of the private /tmp, which is | |
2001 | * non-accessible to world users. Inside of it | |
2002 | * there's a /tmp that is sticky, and that's | |
2003 | * the one we want to use here. */ | |
2004 | ||
2005 | if (context->private_tmp && runtime) { | |
2006 | if (runtime->tmp_dir) | |
63c372cb | 2007 | tmp = strjoina(runtime->tmp_dir, "/tmp"); |
d35fbf6b | 2008 | if (runtime->var_tmp_dir) |
63c372cb | 2009 | var = strjoina(runtime->var_tmp_dir, "/tmp"); |
d35fbf6b | 2010 | } |
d8b4e2e9 | 2011 | |
ff0af2a1 | 2012 | r = setup_namespace( |
c39f1ce2 | 2013 | (params->flags & EXEC_APPLY_CHROOT) ? context->root_directory : NULL, |
2a624c36 AP |
2014 | context->read_write_paths, |
2015 | context->read_only_paths, | |
2016 | context->inaccessible_paths, | |
d35fbf6b DM |
2017 | tmp, |
2018 | var, | |
2019 | context->private_devices, | |
2020 | context->protect_home, | |
2021 | context->protect_system, | |
2022 | context->mount_flags); | |
0015ebf3 | 2023 | |
ff0af2a1 LP |
2024 | /* If we couldn't set up the namespace this is |
2025 | * probably due to a missing capability. In this case, | |
2026 | * silently proceeed. */ | |
2027 | if (r == -EPERM || r == -EACCES) { | |
2028 | log_open(); | |
f2341e0a | 2029 | log_unit_debug_errno(unit, r, "Failed to set up namespace, assuming containerized execution, ignoring: %m"); |
ff0af2a1 LP |
2030 | log_close(); |
2031 | } else if (r < 0) { | |
2032 | *exit_status = EXIT_NAMESPACE; | |
2033 | return r; | |
81a2b7ce | 2034 | } |
d35fbf6b | 2035 | } |
81a2b7ce | 2036 | |
5f5d8eab LP |
2037 | if (context->working_directory_home) |
2038 | wd = home; | |
2039 | else if (context->working_directory) | |
2040 | wd = context->working_directory; | |
2041 | else | |
2042 | wd = "/"; | |
2043 | ||
c39f1ce2 | 2044 | if (params->flags & EXEC_APPLY_CHROOT) { |
ee818b89 | 2045 | if (!needs_mount_namespace && context->root_directory) |
d35fbf6b | 2046 | if (chroot(context->root_directory) < 0) { |
ff0af2a1 | 2047 | *exit_status = EXIT_CHROOT; |
d35fbf6b | 2048 | return -errno; |
8aa75193 LP |
2049 | } |
2050 | ||
5f5d8eab | 2051 | if (chdir(wd) < 0 && |
4c08c824 | 2052 | !context->working_directory_missing_ok) { |
ff0af2a1 | 2053 | *exit_status = EXIT_CHDIR; |
d35fbf6b DM |
2054 | return -errno; |
2055 | } | |
2056 | } else { | |
5f5d8eab | 2057 | const char *d; |
8aa75193 | 2058 | |
5f5d8eab | 2059 | d = strjoina(strempty(context->root_directory), "/", strempty(wd)); |
cf1d0302 LP |
2060 | if (chdir(d) < 0 && |
2061 | !context->working_directory_missing_ok) { | |
ff0af2a1 | 2062 | *exit_status = EXIT_CHDIR; |
d35fbf6b DM |
2063 | return -errno; |
2064 | } | |
2065 | } | |
e66cf1a3 | 2066 | |
9008e1ac | 2067 | #ifdef HAVE_SELINUX |
c39f1ce2 LP |
2068 | if ((params->flags & EXEC_APPLY_PERMISSIONS) && |
2069 | mac_selinux_use() && | |
2070 | params->selinux_context_net && | |
2071 | socket_fd >= 0 && | |
2072 | !command->privileged) { | |
2073 | ||
ff0af2a1 LP |
2074 | r = mac_selinux_get_child_mls_label(socket_fd, command->path, context->selinux_context, &mac_selinux_context_net); |
2075 | if (r < 0) { | |
2076 | *exit_status = EXIT_SELINUX_CONTEXT; | |
2077 | return r; | |
9008e1ac MS |
2078 | } |
2079 | } | |
2080 | #endif | |
2081 | ||
d35fbf6b DM |
2082 | /* We repeat the fd closing here, to make sure that |
2083 | * nothing is leaked from the PAM modules. Note that | |
2084 | * we are more aggressive this time since socket_fd | |
e44da745 DM |
2085 | * and the netns fds we don't need anymore. The custom |
2086 | * endpoint fd was needed to upload the policy and can | |
2087 | * now be closed as well. */ | |
ff0af2a1 LP |
2088 | r = close_all_fds(fds, n_fds); |
2089 | if (r >= 0) | |
2090 | r = shift_fds(fds, n_fds); | |
2091 | if (r >= 0) | |
2092 | r = flags_fds(fds, n_fds, context->non_blocking); | |
2093 | if (r < 0) { | |
2094 | *exit_status = EXIT_FDS; | |
2095 | return r; | |
d35fbf6b | 2096 | } |
e66cf1a3 | 2097 | |
c39f1ce2 | 2098 | if ((params->flags & EXEC_APPLY_PERMISSIONS) && !command->privileged) { |
e66cf1a3 | 2099 | |
19c0b0b9 RC |
2100 | bool use_address_families = context->address_families_whitelist || |
2101 | !set_isempty(context->address_families); | |
2102 | bool use_syscall_filter = context->syscall_whitelist || | |
2103 | !set_isempty(context->syscall_filter) || | |
2104 | !set_isempty(context->syscall_archs); | |
755d4b67 IP |
2105 | int secure_bits = context->secure_bits; |
2106 | ||
d35fbf6b | 2107 | for (i = 0; i < _RLIMIT_MAX; i++) { |
03857c43 | 2108 | |
d35fbf6b DM |
2109 | if (!context->rlimit[i]) |
2110 | continue; | |
2111 | ||
03857c43 LP |
2112 | r = setrlimit_closest(i, context->rlimit[i]); |
2113 | if (r < 0) { | |
ff0af2a1 | 2114 | *exit_status = EXIT_LIMITS; |
03857c43 | 2115 | return r; |
e66cf1a3 LP |
2116 | } |
2117 | } | |
2118 | ||
f4170c67 LP |
2119 | /* Set the RTPRIO resource limit to 0, but only if nothing else was explicitly requested. */ |
2120 | if (context->restrict_realtime && !context->rlimit[RLIMIT_RTPRIO]) { | |
2121 | if (setrlimit(RLIMIT_RTPRIO, &RLIMIT_MAKE_CONST(0)) < 0) { | |
2122 | *exit_status = EXIT_LIMITS; | |
2123 | return -errno; | |
2124 | } | |
2125 | } | |
2126 | ||
a103496c IP |
2127 | if (!cap_test_all(context->capability_bounding_set)) { |
2128 | r = capability_bounding_set_drop(context->capability_bounding_set, false); | |
ff0af2a1 LP |
2129 | if (r < 0) { |
2130 | *exit_status = EXIT_CAPABILITIES; | |
2131 | return r; | |
3b8bddde | 2132 | } |
4c2630eb | 2133 | } |
3b8bddde | 2134 | |
755d4b67 IP |
2135 | /* This is done before enforce_user, but ambient set |
2136 | * does not survive over setresuid() if keep_caps is not set. */ | |
2137 | if (context->capability_ambient_set != 0) { | |
2138 | r = capability_ambient_set_apply(context->capability_ambient_set, true); | |
2139 | if (r < 0) { | |
2140 | *exit_status = EXIT_CAPABILITIES; | |
2141 | return r; | |
2142 | } | |
755d4b67 IP |
2143 | } |
2144 | ||
d35fbf6b | 2145 | if (context->user) { |
ff0af2a1 LP |
2146 | r = enforce_user(context, uid); |
2147 | if (r < 0) { | |
2148 | *exit_status = EXIT_USER; | |
2149 | return r; | |
5b6319dc | 2150 | } |
755d4b67 IP |
2151 | if (context->capability_ambient_set != 0) { |
2152 | ||
2153 | /* Fix the ambient capabilities after user change. */ | |
2154 | r = capability_ambient_set_apply(context->capability_ambient_set, false); | |
2155 | if (r < 0) { | |
2156 | *exit_status = EXIT_CAPABILITIES; | |
2157 | return r; | |
2158 | } | |
2159 | ||
2160 | /* If we were asked to change user and ambient capabilities | |
2161 | * were requested, we had to add keep-caps to the securebits | |
2162 | * so that we would maintain the inherited capability set | |
2163 | * through the setresuid(). Make sure that the bit is added | |
2164 | * also to the context secure_bits so that we don't try to | |
2165 | * drop the bit away next. */ | |
2166 | ||
7f508f2c | 2167 | secure_bits |= 1<<SECURE_KEEP_CAPS; |
755d4b67 | 2168 | } |
5b6319dc | 2169 | } |
d35fbf6b DM |
2170 | |
2171 | /* PR_GET_SECUREBITS is not privileged, while | |
2172 | * PR_SET_SECUREBITS is. So to suppress | |
2173 | * potential EPERMs we'll try not to call | |
2174 | * PR_SET_SECUREBITS unless necessary. */ | |
755d4b67 IP |
2175 | if (prctl(PR_GET_SECUREBITS) != secure_bits) |
2176 | if (prctl(PR_SET_SECUREBITS, secure_bits) < 0) { | |
ff0af2a1 | 2177 | *exit_status = EXIT_SECUREBITS; |
d35fbf6b | 2178 | return -errno; |
ff01d048 | 2179 | } |
5b6319dc | 2180 | |
19c0b0b9 | 2181 | if (context->no_new_privileges || |
f4170c67 | 2182 | (!have_effective_cap(CAP_SYS_ADMIN) && (use_address_families || context->memory_deny_write_execute || context->restrict_realtime || use_syscall_filter))) |
d35fbf6b | 2183 | if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) { |
ff0af2a1 | 2184 | *exit_status = EXIT_NO_NEW_PRIVILEGES; |
d35fbf6b DM |
2185 | return -errno; |
2186 | } | |
2187 | ||
2188 | #ifdef HAVE_SECCOMP | |
19c0b0b9 | 2189 | if (use_address_families) { |
ff0af2a1 LP |
2190 | r = apply_address_families(context); |
2191 | if (r < 0) { | |
2192 | *exit_status = EXIT_ADDRESS_FAMILIES; | |
2193 | return r; | |
4c2630eb MS |
2194 | } |
2195 | } | |
04aa0cb9 | 2196 | |
f3e43635 TM |
2197 | if (context->memory_deny_write_execute) { |
2198 | r = apply_memory_deny_write_execute(context); | |
2199 | if (r < 0) { | |
2200 | *exit_status = EXIT_SECCOMP; | |
2201 | return r; | |
2202 | } | |
2203 | } | |
f4170c67 LP |
2204 | |
2205 | if (context->restrict_realtime) { | |
2206 | r = apply_restrict_realtime(context); | |
2207 | if (r < 0) { | |
2208 | *exit_status = EXIT_SECCOMP; | |
2209 | return r; | |
2210 | } | |
2211 | } | |
2212 | ||
19c0b0b9 | 2213 | if (use_syscall_filter) { |
ff0af2a1 LP |
2214 | r = apply_seccomp(context); |
2215 | if (r < 0) { | |
2216 | *exit_status = EXIT_SECCOMP; | |
2217 | return r; | |
81a2b7ce | 2218 | } |
d35fbf6b DM |
2219 | } |
2220 | #endif | |
81a2b7ce | 2221 | |
d35fbf6b | 2222 | #ifdef HAVE_SELINUX |
6baa7db0 | 2223 | if (mac_selinux_use()) { |
9008e1ac | 2224 | char *exec_context = mac_selinux_context_net ?: context->selinux_context; |
16115b0a | 2225 | |
9008e1ac | 2226 | if (exec_context) { |
ff0af2a1 LP |
2227 | r = setexeccon(exec_context); |
2228 | if (r < 0) { | |
2229 | *exit_status = EXIT_SELINUX_CONTEXT; | |
2230 | return r; | |
16115b0a | 2231 | } |
81a2b7ce | 2232 | } |
81a2b7ce | 2233 | } |
d35fbf6b | 2234 | #endif |
81a2b7ce | 2235 | |
d35fbf6b | 2236 | #ifdef HAVE_APPARMOR |
6baa7db0 | 2237 | if (context->apparmor_profile && mac_apparmor_use()) { |
ff0af2a1 LP |
2238 | r = aa_change_onexec(context->apparmor_profile); |
2239 | if (r < 0 && !context->apparmor_profile_ignore) { | |
2240 | *exit_status = EXIT_APPARMOR_PROFILE; | |
5482192e | 2241 | return -errno; |
d35fbf6b | 2242 | } |
034c6ed7 | 2243 | } |
d35fbf6b DM |
2244 | #endif |
2245 | } | |
034c6ed7 | 2246 | |
2065ca69 | 2247 | final_argv = replace_env_argv(argv, accum_env); |
d35fbf6b | 2248 | if (!final_argv) { |
ff0af2a1 | 2249 | *exit_status = EXIT_MEMORY; |
d35fbf6b DM |
2250 | return -ENOMEM; |
2251 | } | |
034c6ed7 | 2252 | |
553d2243 | 2253 | if (_unlikely_(log_get_max_level() >= LOG_DEBUG)) { |
d35fbf6b | 2254 | _cleanup_free_ char *line; |
81a2b7ce | 2255 | |
d35fbf6b DM |
2256 | line = exec_command_line(final_argv); |
2257 | if (line) { | |
2258 | log_open(); | |
f2341e0a LP |
2259 | log_struct(LOG_DEBUG, |
2260 | LOG_UNIT_ID(unit), | |
2261 | "EXECUTABLE=%s", command->path, | |
2262 | LOG_UNIT_MESSAGE(unit, "Executing: %s", line), | |
2263 | NULL); | |
d35fbf6b DM |
2264 | log_close(); |
2265 | } | |
2266 | } | |
dd305ec9 | 2267 | |
2065ca69 | 2268 | execve(command->path, final_argv, accum_env); |
ff0af2a1 | 2269 | *exit_status = EXIT_EXEC; |
d35fbf6b DM |
2270 | return -errno; |
2271 | } | |
81a2b7ce | 2272 | |
f2341e0a LP |
2273 | int exec_spawn(Unit *unit, |
2274 | ExecCommand *command, | |
d35fbf6b DM |
2275 | const ExecContext *context, |
2276 | const ExecParameters *params, | |
2277 | ExecRuntime *runtime, | |
29206d46 | 2278 | DynamicCreds *dcreds, |
d35fbf6b | 2279 | pid_t *ret) { |
8351ceae | 2280 | |
d35fbf6b DM |
2281 | _cleanup_strv_free_ char **files_env = NULL; |
2282 | int *fds = NULL; unsigned n_fds = 0; | |
ff0af2a1 LP |
2283 | _cleanup_free_ char *line = NULL; |
2284 | int socket_fd, r; | |
2285 | char **argv; | |
d35fbf6b | 2286 | pid_t pid; |
8351ceae | 2287 | |
f2341e0a | 2288 | assert(unit); |
d35fbf6b DM |
2289 | assert(command); |
2290 | assert(context); | |
2291 | assert(ret); | |
2292 | assert(params); | |
2293 | assert(params->fds || params->n_fds <= 0); | |
4298d0b5 | 2294 | |
d35fbf6b DM |
2295 | if (context->std_input == EXEC_INPUT_SOCKET || |
2296 | context->std_output == EXEC_OUTPUT_SOCKET || | |
2297 | context->std_error == EXEC_OUTPUT_SOCKET) { | |
17df7223 | 2298 | |
ff0af2a1 | 2299 | if (params->n_fds != 1) { |
f2341e0a | 2300 | log_unit_error(unit, "Got more than one socket."); |
d35fbf6b | 2301 | return -EINVAL; |
ff0af2a1 | 2302 | } |
eef65bf3 | 2303 | |
d35fbf6b DM |
2304 | socket_fd = params->fds[0]; |
2305 | } else { | |
2306 | socket_fd = -1; | |
2307 | fds = params->fds; | |
2308 | n_fds = params->n_fds; | |
2309 | } | |
94f04347 | 2310 | |
f2341e0a | 2311 | r = exec_context_load_environment(unit, context, &files_env); |
ff0af2a1 | 2312 | if (r < 0) |
f2341e0a | 2313 | return log_unit_error_errno(unit, r, "Failed to load environment files: %m"); |
034c6ed7 | 2314 | |
d35fbf6b | 2315 | argv = params->argv ?: command->argv; |
d35fbf6b DM |
2316 | line = exec_command_line(argv); |
2317 | if (!line) | |
2318 | return log_oom(); | |
fab56fc5 | 2319 | |
f2341e0a LP |
2320 | log_struct(LOG_DEBUG, |
2321 | LOG_UNIT_ID(unit), | |
2322 | LOG_UNIT_MESSAGE(unit, "About to execute: %s", line), | |
2323 | "EXECUTABLE=%s", command->path, | |
2324 | NULL); | |
d35fbf6b DM |
2325 | pid = fork(); |
2326 | if (pid < 0) | |
74129a12 | 2327 | return log_unit_error_errno(unit, errno, "Failed to fork: %m"); |
d35fbf6b DM |
2328 | |
2329 | if (pid == 0) { | |
ff0af2a1 LP |
2330 | int exit_status; |
2331 | ||
f2341e0a LP |
2332 | r = exec_child(unit, |
2333 | command, | |
ff0af2a1 LP |
2334 | context, |
2335 | params, | |
2336 | runtime, | |
29206d46 | 2337 | dcreds, |
ff0af2a1 LP |
2338 | argv, |
2339 | socket_fd, | |
2340 | fds, n_fds, | |
2341 | files_env, | |
2342 | &exit_status); | |
2343 | if (r < 0) { | |
4c2630eb | 2344 | log_open(); |
f2341e0a LP |
2345 | log_struct_errno(LOG_ERR, r, |
2346 | LOG_MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED), | |
2347 | LOG_UNIT_ID(unit), | |
2348 | LOG_UNIT_MESSAGE(unit, "Failed at step %s spawning %s: %m", | |
2349 | exit_status_to_string(exit_status, EXIT_STATUS_SYSTEMD), | |
2350 | command->path), | |
2351 | "EXECUTABLE=%s", command->path, | |
2352 | NULL); | |
4c2630eb MS |
2353 | } |
2354 | ||
ff0af2a1 | 2355 | _exit(exit_status); |
034c6ed7 LP |
2356 | } |
2357 | ||
f2341e0a | 2358 | log_unit_debug(unit, "Forked %s as "PID_FMT, command->path, pid); |
23635a85 | 2359 | |
80876c20 LP |
2360 | /* We add the new process to the cgroup both in the child (so |
2361 | * that we can be sure that no user code is ever executed | |
2362 | * outside of the cgroup) and in the parent (so that we can be | |
2363 | * sure that when we kill the cgroup the process will be | |
2364 | * killed too). */ | |
d35fbf6b | 2365 | if (params->cgroup_path) |
dd305ec9 | 2366 | (void) cg_attach(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, pid); |
2da3263a | 2367 | |
b58b4116 | 2368 | exec_status_start(&command->exec_status, pid); |
9fb86720 | 2369 | |
034c6ed7 | 2370 | *ret = pid; |
5cb5a6ff LP |
2371 | return 0; |
2372 | } | |
2373 | ||
034c6ed7 LP |
2374 | void exec_context_init(ExecContext *c) { |
2375 | assert(c); | |
2376 | ||
4c12626c | 2377 | c->umask = 0022; |
9eba9da4 | 2378 | c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0); |
94f04347 | 2379 | c->cpu_sched_policy = SCHED_OTHER; |
071830ff | 2380 | c->syslog_priority = LOG_DAEMON|LOG_INFO; |
74922904 | 2381 | c->syslog_level_prefix = true; |
353e12c2 | 2382 | c->ignore_sigpipe = true; |
3a43da28 | 2383 | c->timer_slack_nsec = NSEC_INFINITY; |
050f7277 | 2384 | c->personality = PERSONALITY_INVALID; |
e66cf1a3 | 2385 | c->runtime_directory_mode = 0755; |
a103496c | 2386 | c->capability_bounding_set = CAP_ALL; |
034c6ed7 LP |
2387 | } |
2388 | ||
613b411c | 2389 | void exec_context_done(ExecContext *c) { |
5cb5a6ff LP |
2390 | unsigned l; |
2391 | ||
2392 | assert(c); | |
2393 | ||
6796073e LP |
2394 | c->environment = strv_free(c->environment); |
2395 | c->environment_files = strv_free(c->environment_files); | |
b4c14404 | 2396 | c->pass_environment = strv_free(c->pass_environment); |
8c7be95e | 2397 | |
1f6b4113 | 2398 | for (l = 0; l < ELEMENTSOF(c->rlimit); l++) |
a1e58e8e | 2399 | c->rlimit[l] = mfree(c->rlimit[l]); |
034c6ed7 | 2400 | |
a1e58e8e LP |
2401 | c->working_directory = mfree(c->working_directory); |
2402 | c->root_directory = mfree(c->root_directory); | |
2403 | c->tty_path = mfree(c->tty_path); | |
2404 | c->syslog_identifier = mfree(c->syslog_identifier); | |
2405 | c->user = mfree(c->user); | |
2406 | c->group = mfree(c->group); | |
034c6ed7 | 2407 | |
6796073e | 2408 | c->supplementary_groups = strv_free(c->supplementary_groups); |
94f04347 | 2409 | |
a1e58e8e | 2410 | c->pam_name = mfree(c->pam_name); |
5b6319dc | 2411 | |
2a624c36 AP |
2412 | c->read_only_paths = strv_free(c->read_only_paths); |
2413 | c->read_write_paths = strv_free(c->read_write_paths); | |
2414 | c->inaccessible_paths = strv_free(c->inaccessible_paths); | |
82c121a4 LP |
2415 | |
2416 | if (c->cpuset) | |
2417 | CPU_FREE(c->cpuset); | |
86a3475b | 2418 | |
a1e58e8e LP |
2419 | c->utmp_id = mfree(c->utmp_id); |
2420 | c->selinux_context = mfree(c->selinux_context); | |
2421 | c->apparmor_profile = mfree(c->apparmor_profile); | |
eef65bf3 | 2422 | |
525d3cc7 LP |
2423 | c->syscall_filter = set_free(c->syscall_filter); |
2424 | c->syscall_archs = set_free(c->syscall_archs); | |
2425 | c->address_families = set_free(c->address_families); | |
e66cf1a3 | 2426 | |
6796073e | 2427 | c->runtime_directory = strv_free(c->runtime_directory); |
e66cf1a3 LP |
2428 | } |
2429 | ||
2430 | int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) { | |
2431 | char **i; | |
2432 | ||
2433 | assert(c); | |
2434 | ||
2435 | if (!runtime_prefix) | |
2436 | return 0; | |
2437 | ||
2438 | STRV_FOREACH(i, c->runtime_directory) { | |
2439 | _cleanup_free_ char *p; | |
2440 | ||
2441 | p = strjoin(runtime_prefix, "/", *i, NULL); | |
2442 | if (!p) | |
2443 | return -ENOMEM; | |
2444 | ||
2445 | /* We execute this synchronously, since we need to be | |
2446 | * sure this is gone when we start the service | |
2447 | * next. */ | |
c6878637 | 2448 | (void) rm_rf(p, REMOVE_ROOT); |
e66cf1a3 LP |
2449 | } |
2450 | ||
2451 | return 0; | |
5cb5a6ff LP |
2452 | } |
2453 | ||
43d0fcbd LP |
2454 | void exec_command_done(ExecCommand *c) { |
2455 | assert(c); | |
2456 | ||
a1e58e8e | 2457 | c->path = mfree(c->path); |
43d0fcbd | 2458 | |
6796073e | 2459 | c->argv = strv_free(c->argv); |
43d0fcbd LP |
2460 | } |
2461 | ||
2462 | void exec_command_done_array(ExecCommand *c, unsigned n) { | |
2463 | unsigned i; | |
2464 | ||
2465 | for (i = 0; i < n; i++) | |
2466 | exec_command_done(c+i); | |
2467 | } | |
2468 | ||
f1acf85a | 2469 | ExecCommand* exec_command_free_list(ExecCommand *c) { |
5cb5a6ff LP |
2470 | ExecCommand *i; |
2471 | ||
2472 | while ((i = c)) { | |
71fda00f | 2473 | LIST_REMOVE(command, c, i); |
43d0fcbd | 2474 | exec_command_done(i); |
5cb5a6ff LP |
2475 | free(i); |
2476 | } | |
f1acf85a ZJS |
2477 | |
2478 | return NULL; | |
5cb5a6ff LP |
2479 | } |
2480 | ||
034c6ed7 LP |
2481 | void exec_command_free_array(ExecCommand **c, unsigned n) { |
2482 | unsigned i; | |
2483 | ||
f1acf85a ZJS |
2484 | for (i = 0; i < n; i++) |
2485 | c[i] = exec_command_free_list(c[i]); | |
034c6ed7 LP |
2486 | } |
2487 | ||
039f0e70 | 2488 | typedef struct InvalidEnvInfo { |
f2341e0a | 2489 | Unit *unit; |
039f0e70 LP |
2490 | const char *path; |
2491 | } InvalidEnvInfo; | |
2492 | ||
2493 | static void invalid_env(const char *p, void *userdata) { | |
2494 | InvalidEnvInfo *info = userdata; | |
2495 | ||
f2341e0a | 2496 | log_unit_error(info->unit, "Ignoring invalid environment assignment '%s': %s", p, info->path); |
039f0e70 LP |
2497 | } |
2498 | ||
f2341e0a | 2499 | int exec_context_load_environment(Unit *unit, const ExecContext *c, char ***l) { |
8c7be95e LP |
2500 | char **i, **r = NULL; |
2501 | ||
2502 | assert(c); | |
2503 | assert(l); | |
2504 | ||
2505 | STRV_FOREACH(i, c->environment_files) { | |
2506 | char *fn; | |
2507 | int k; | |
2508 | bool ignore = false; | |
2509 | char **p; | |
7fd1b19b | 2510 | _cleanup_globfree_ glob_t pglob = {}; |
2bef10ab | 2511 | int count, n; |
8c7be95e LP |
2512 | |
2513 | fn = *i; | |
2514 | ||
2515 | if (fn[0] == '-') { | |
2516 | ignore = true; | |
313cefa1 | 2517 | fn++; |
8c7be95e LP |
2518 | } |
2519 | ||
2520 | if (!path_is_absolute(fn)) { | |
8c7be95e LP |
2521 | if (ignore) |
2522 | continue; | |
2523 | ||
2524 | strv_free(r); | |
2525 | return -EINVAL; | |
2526 | } | |
2527 | ||
2bef10ab | 2528 | /* Filename supports globbing, take all matching files */ |
2bef10ab PL |
2529 | errno = 0; |
2530 | if (glob(fn, 0, NULL, &pglob) != 0) { | |
2bef10ab PL |
2531 | if (ignore) |
2532 | continue; | |
8c7be95e | 2533 | |
2bef10ab | 2534 | strv_free(r); |
f5e5c28f | 2535 | return errno > 0 ? -errno : -EINVAL; |
2bef10ab PL |
2536 | } |
2537 | count = pglob.gl_pathc; | |
2538 | if (count == 0) { | |
8c7be95e LP |
2539 | if (ignore) |
2540 | continue; | |
2541 | ||
2542 | strv_free(r); | |
2bef10ab | 2543 | return -EINVAL; |
8c7be95e | 2544 | } |
2bef10ab | 2545 | for (n = 0; n < count; n++) { |
717603e3 | 2546 | k = load_env_file(NULL, pglob.gl_pathv[n], NULL, &p); |
2bef10ab PL |
2547 | if (k < 0) { |
2548 | if (ignore) | |
2549 | continue; | |
8c7be95e | 2550 | |
2bef10ab | 2551 | strv_free(r); |
2bef10ab | 2552 | return k; |
e9c1ea9d | 2553 | } |
ebc05a09 | 2554 | /* Log invalid environment variables with filename */ |
039f0e70 LP |
2555 | if (p) { |
2556 | InvalidEnvInfo info = { | |
f2341e0a | 2557 | .unit = unit, |
039f0e70 LP |
2558 | .path = pglob.gl_pathv[n] |
2559 | }; | |
2560 | ||
2561 | p = strv_env_clean_with_callback(p, invalid_env, &info); | |
2562 | } | |
8c7be95e | 2563 | |
2bef10ab PL |
2564 | if (r == NULL) |
2565 | r = p; | |
2566 | else { | |
2567 | char **m; | |
8c7be95e | 2568 | |
2bef10ab PL |
2569 | m = strv_env_merge(2, r, p); |
2570 | strv_free(r); | |
2571 | strv_free(p); | |
c84a9488 | 2572 | if (!m) |
2bef10ab | 2573 | return -ENOMEM; |
2bef10ab PL |
2574 | |
2575 | r = m; | |
2576 | } | |
8c7be95e LP |
2577 | } |
2578 | } | |
2579 | ||
2580 | *l = r; | |
2581 | ||
2582 | return 0; | |
2583 | } | |
2584 | ||
6ac8fdc9 | 2585 | static bool tty_may_match_dev_console(const char *tty) { |
e1d75803 | 2586 | _cleanup_free_ char *active = NULL; |
7d6884b6 | 2587 | char *console; |
6ac8fdc9 | 2588 | |
1e22b5cd LP |
2589 | if (!tty) |
2590 | return true; | |
2591 | ||
6ac8fdc9 MS |
2592 | if (startswith(tty, "/dev/")) |
2593 | tty += 5; | |
2594 | ||
2595 | /* trivial identity? */ | |
2596 | if (streq(tty, "console")) | |
2597 | return true; | |
2598 | ||
2599 | console = resolve_dev_console(&active); | |
2600 | /* if we could not resolve, assume it may */ | |
2601 | if (!console) | |
2602 | return true; | |
2603 | ||
2604 | /* "tty0" means the active VC, so it may be the same sometimes */ | |
e1d75803 | 2605 | return streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty)); |
6ac8fdc9 MS |
2606 | } |
2607 | ||
2608 | bool exec_context_may_touch_console(ExecContext *ec) { | |
1e22b5cd LP |
2609 | |
2610 | return (ec->tty_reset || | |
2611 | ec->tty_vhangup || | |
2612 | ec->tty_vt_disallocate || | |
6ac8fdc9 MS |
2613 | is_terminal_input(ec->std_input) || |
2614 | is_terminal_output(ec->std_output) || | |
2615 | is_terminal_output(ec->std_error)) && | |
1e22b5cd | 2616 | tty_may_match_dev_console(exec_context_tty_path(ec)); |
6ac8fdc9 MS |
2617 | } |
2618 | ||
15ae422b LP |
2619 | static void strv_fprintf(FILE *f, char **l) { |
2620 | char **g; | |
2621 | ||
2622 | assert(f); | |
2623 | ||
2624 | STRV_FOREACH(g, l) | |
2625 | fprintf(f, " %s", *g); | |
2626 | } | |
2627 | ||
5cb5a6ff | 2628 | void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { |
c2bbd90b | 2629 | char **e, **d; |
94f04347 | 2630 | unsigned i; |
9eba9da4 | 2631 | |
5cb5a6ff LP |
2632 | assert(c); |
2633 | assert(f); | |
2634 | ||
4ad49000 | 2635 | prefix = strempty(prefix); |
5cb5a6ff LP |
2636 | |
2637 | fprintf(f, | |
94f04347 LP |
2638 | "%sUMask: %04o\n" |
2639 | "%sWorkingDirectory: %s\n" | |
451a074f | 2640 | "%sRootDirectory: %s\n" |
15ae422b | 2641 | "%sNonBlocking: %s\n" |
64747e2d | 2642 | "%sPrivateTmp: %s\n" |
4819ff03 | 2643 | "%sPrivateNetwork: %s\n" |
7f112f50 | 2644 | "%sPrivateDevices: %s\n" |
1b8689f9 LP |
2645 | "%sProtectHome: %s\n" |
2646 | "%sProtectSystem: %s\n" | |
f3e43635 | 2647 | "%sIgnoreSIGPIPE: %s\n" |
f4170c67 LP |
2648 | "%sMemoryDenyWriteExecute: %s\n" |
2649 | "%sRestrictRealtime: %s\n", | |
5cb5a6ff | 2650 | prefix, c->umask, |
9eba9da4 | 2651 | prefix, c->working_directory ? c->working_directory : "/", |
451a074f | 2652 | prefix, c->root_directory ? c->root_directory : "/", |
15ae422b | 2653 | prefix, yes_no(c->non_blocking), |
64747e2d | 2654 | prefix, yes_no(c->private_tmp), |
4819ff03 | 2655 | prefix, yes_no(c->private_network), |
7f112f50 | 2656 | prefix, yes_no(c->private_devices), |
1b8689f9 LP |
2657 | prefix, protect_home_to_string(c->protect_home), |
2658 | prefix, protect_system_to_string(c->protect_system), | |
f3e43635 | 2659 | prefix, yes_no(c->ignore_sigpipe), |
f4170c67 LP |
2660 | prefix, yes_no(c->memory_deny_write_execute), |
2661 | prefix, yes_no(c->restrict_realtime)); | |
fb33a393 | 2662 | |
8c7be95e LP |
2663 | STRV_FOREACH(e, c->environment) |
2664 | fprintf(f, "%sEnvironment: %s\n", prefix, *e); | |
2665 | ||
2666 | STRV_FOREACH(e, c->environment_files) | |
2667 | fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e); | |
94f04347 | 2668 | |
b4c14404 FB |
2669 | STRV_FOREACH(e, c->pass_environment) |
2670 | fprintf(f, "%sPassEnvironment: %s\n", prefix, *e); | |
2671 | ||
c2bbd90b EV |
2672 | fprintf(f, "%sRuntimeDirectoryMode: %04o\n", prefix, c->runtime_directory_mode); |
2673 | ||
2674 | STRV_FOREACH(d, c->runtime_directory) | |
2675 | fprintf(f, "%sRuntimeDirectory: %s\n", prefix, *d); | |
2676 | ||
fb33a393 LP |
2677 | if (c->nice_set) |
2678 | fprintf(f, | |
2679 | "%sNice: %i\n", | |
2680 | prefix, c->nice); | |
2681 | ||
dd6c17b1 | 2682 | if (c->oom_score_adjust_set) |
fb33a393 | 2683 | fprintf(f, |
dd6c17b1 LP |
2684 | "%sOOMScoreAdjust: %i\n", |
2685 | prefix, c->oom_score_adjust); | |
9eba9da4 | 2686 | |
94f04347 | 2687 | for (i = 0; i < RLIM_NLIMITS; i++) |
3c11da9d EV |
2688 | if (c->rlimit[i]) { |
2689 | fprintf(f, "%s%s: " RLIM_FMT "\n", | |
2690 | prefix, rlimit_to_string(i), c->rlimit[i]->rlim_max); | |
2691 | fprintf(f, "%s%sSoft: " RLIM_FMT "\n", | |
2692 | prefix, rlimit_to_string(i), c->rlimit[i]->rlim_cur); | |
2693 | } | |
94f04347 | 2694 | |
f8b69d1d | 2695 | if (c->ioprio_set) { |
1756a011 | 2696 | _cleanup_free_ char *class_str = NULL; |
f8b69d1d | 2697 | |
1756a011 | 2698 | ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str); |
9eba9da4 LP |
2699 | fprintf(f, |
2700 | "%sIOSchedulingClass: %s\n" | |
2701 | "%sIOPriority: %i\n", | |
f8b69d1d | 2702 | prefix, strna(class_str), |
9eba9da4 | 2703 | prefix, (int) IOPRIO_PRIO_DATA(c->ioprio)); |
f8b69d1d | 2704 | } |
94f04347 | 2705 | |
f8b69d1d | 2706 | if (c->cpu_sched_set) { |
1756a011 | 2707 | _cleanup_free_ char *policy_str = NULL; |
f8b69d1d | 2708 | |
1756a011 | 2709 | sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str); |
94f04347 LP |
2710 | fprintf(f, |
2711 | "%sCPUSchedulingPolicy: %s\n" | |
38b48754 LP |
2712 | "%sCPUSchedulingPriority: %i\n" |
2713 | "%sCPUSchedulingResetOnFork: %s\n", | |
f8b69d1d | 2714 | prefix, strna(policy_str), |
38b48754 LP |
2715 | prefix, c->cpu_sched_priority, |
2716 | prefix, yes_no(c->cpu_sched_reset_on_fork)); | |
b929bf04 | 2717 | } |
94f04347 | 2718 | |
82c121a4 | 2719 | if (c->cpuset) { |
94f04347 | 2720 | fprintf(f, "%sCPUAffinity:", prefix); |
82c121a4 LP |
2721 | for (i = 0; i < c->cpuset_ncpus; i++) |
2722 | if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset)) | |
43a99a7a | 2723 | fprintf(f, " %u", i); |
94f04347 LP |
2724 | fputs("\n", f); |
2725 | } | |
2726 | ||
3a43da28 | 2727 | if (c->timer_slack_nsec != NSEC_INFINITY) |
ccd06097 | 2728 | fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec); |
94f04347 LP |
2729 | |
2730 | fprintf(f, | |
80876c20 LP |
2731 | "%sStandardInput: %s\n" |
2732 | "%sStandardOutput: %s\n" | |
2733 | "%sStandardError: %s\n", | |
2734 | prefix, exec_input_to_string(c->std_input), | |
2735 | prefix, exec_output_to_string(c->std_output), | |
2736 | prefix, exec_output_to_string(c->std_error)); | |
2737 | ||
2738 | if (c->tty_path) | |
2739 | fprintf(f, | |
6ea832a2 LP |
2740 | "%sTTYPath: %s\n" |
2741 | "%sTTYReset: %s\n" | |
2742 | "%sTTYVHangup: %s\n" | |
2743 | "%sTTYVTDisallocate: %s\n", | |
2744 | prefix, c->tty_path, | |
2745 | prefix, yes_no(c->tty_reset), | |
2746 | prefix, yes_no(c->tty_vhangup), | |
2747 | prefix, yes_no(c->tty_vt_disallocate)); | |
94f04347 | 2748 | |
5ce70e5b ZJS |
2749 | if (c->std_output == EXEC_OUTPUT_SYSLOG || |
2750 | c->std_output == EXEC_OUTPUT_KMSG || | |
2751 | c->std_output == EXEC_OUTPUT_JOURNAL || | |
2752 | c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
2753 | c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
2754 | c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE || | |
2755 | c->std_error == EXEC_OUTPUT_SYSLOG || | |
2756 | c->std_error == EXEC_OUTPUT_KMSG || | |
2757 | c->std_error == EXEC_OUTPUT_JOURNAL || | |
2758 | c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
2759 | c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
2760 | c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) { | |
f8b69d1d | 2761 | |
5ce70e5b | 2762 | _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL; |
f8b69d1d | 2763 | |
5ce70e5b ZJS |
2764 | log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str); |
2765 | log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str); | |
f8b69d1d | 2766 | |
94f04347 LP |
2767 | fprintf(f, |
2768 | "%sSyslogFacility: %s\n" | |
2769 | "%sSyslogLevel: %s\n", | |
f8b69d1d MS |
2770 | prefix, strna(fac_str), |
2771 | prefix, strna(lvl_str)); | |
f8b69d1d | 2772 | } |
94f04347 | 2773 | |
94f04347 LP |
2774 | if (c->secure_bits) |
2775 | fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n", | |
2776 | prefix, | |
cbb21cca ZJS |
2777 | (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "", |
2778 | (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "", | |
2779 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "", | |
2780 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "", | |
2781 | (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "", | |
2782 | (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : ""); | |
94f04347 | 2783 | |
a103496c | 2784 | if (c->capability_bounding_set != CAP_ALL) { |
ae556c21 | 2785 | unsigned long l; |
260abb78 | 2786 | fprintf(f, "%sCapabilityBoundingSet:", prefix); |
94f04347 | 2787 | |
64685e0c | 2788 | for (l = 0; l <= cap_last_cap(); l++) |
a103496c | 2789 | if (c->capability_bounding_set & (UINT64_C(1) << l)) |
2822da4f | 2790 | fprintf(f, " %s", strna(capability_to_name(l))); |
94f04347 LP |
2791 | |
2792 | fputs("\n", f); | |
755d4b67 IP |
2793 | } |
2794 | ||
2795 | if (c->capability_ambient_set != 0) { | |
2796 | unsigned long l; | |
2797 | fprintf(f, "%sAmbientCapabilities:", prefix); | |
2798 | ||
2799 | for (l = 0; l <= cap_last_cap(); l++) | |
2800 | if (c->capability_ambient_set & (UINT64_C(1) << l)) | |
2801 | fprintf(f, " %s", strna(capability_to_name(l))); | |
2802 | ||
2803 | fputs("\n", f); | |
94f04347 LP |
2804 | } |
2805 | ||
2806 | if (c->user) | |
f2d3769a | 2807 | fprintf(f, "%sUser: %s\n", prefix, c->user); |
94f04347 | 2808 | if (c->group) |
f2d3769a | 2809 | fprintf(f, "%sGroup: %s\n", prefix, c->group); |
94f04347 | 2810 | |
29206d46 LP |
2811 | fprintf(f, "%sDynamicUser: %s\n", prefix, yes_no(c->dynamic_user)); |
2812 | ||
15ae422b | 2813 | if (strv_length(c->supplementary_groups) > 0) { |
94f04347 | 2814 | fprintf(f, "%sSupplementaryGroups:", prefix); |
15ae422b LP |
2815 | strv_fprintf(f, c->supplementary_groups); |
2816 | fputs("\n", f); | |
2817 | } | |
94f04347 | 2818 | |
5b6319dc | 2819 | if (c->pam_name) |
f2d3769a | 2820 | fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name); |
5b6319dc | 2821 | |
2a624c36 AP |
2822 | if (strv_length(c->read_write_paths) > 0) { |
2823 | fprintf(f, "%sReadWritePaths:", prefix); | |
2824 | strv_fprintf(f, c->read_write_paths); | |
15ae422b LP |
2825 | fputs("\n", f); |
2826 | } | |
2827 | ||
2a624c36 AP |
2828 | if (strv_length(c->read_only_paths) > 0) { |
2829 | fprintf(f, "%sReadOnlyPaths:", prefix); | |
2830 | strv_fprintf(f, c->read_only_paths); | |
15ae422b LP |
2831 | fputs("\n", f); |
2832 | } | |
94f04347 | 2833 | |
2a624c36 AP |
2834 | if (strv_length(c->inaccessible_paths) > 0) { |
2835 | fprintf(f, "%sInaccessiblePaths:", prefix); | |
2836 | strv_fprintf(f, c->inaccessible_paths); | |
94f04347 LP |
2837 | fputs("\n", f); |
2838 | } | |
2e22afe9 | 2839 | |
169c1bda LP |
2840 | if (c->utmp_id) |
2841 | fprintf(f, | |
2842 | "%sUtmpIdentifier: %s\n", | |
2843 | prefix, c->utmp_id); | |
7b52a628 MS |
2844 | |
2845 | if (c->selinux_context) | |
2846 | fprintf(f, | |
5f8640fb LP |
2847 | "%sSELinuxContext: %s%s\n", |
2848 | prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context); | |
17df7223 | 2849 | |
050f7277 | 2850 | if (c->personality != PERSONALITY_INVALID) |
ac45f971 LP |
2851 | fprintf(f, |
2852 | "%sPersonality: %s\n", | |
2853 | prefix, strna(personality_to_string(c->personality))); | |
2854 | ||
17df7223 | 2855 | if (c->syscall_filter) { |
351a19b1 | 2856 | #ifdef HAVE_SECCOMP |
17df7223 LP |
2857 | Iterator j; |
2858 | void *id; | |
2859 | bool first = true; | |
351a19b1 | 2860 | #endif |
17df7223 LP |
2861 | |
2862 | fprintf(f, | |
57183d11 | 2863 | "%sSystemCallFilter: ", |
17df7223 LP |
2864 | prefix); |
2865 | ||
2866 | if (!c->syscall_whitelist) | |
2867 | fputc('~', f); | |
2868 | ||
351a19b1 | 2869 | #ifdef HAVE_SECCOMP |
17df7223 LP |
2870 | SET_FOREACH(id, c->syscall_filter, j) { |
2871 | _cleanup_free_ char *name = NULL; | |
2872 | ||
2873 | if (first) | |
2874 | first = false; | |
2875 | else | |
2876 | fputc(' ', f); | |
2877 | ||
57183d11 | 2878 | name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1); |
17df7223 LP |
2879 | fputs(strna(name), f); |
2880 | } | |
351a19b1 | 2881 | #endif |
17df7223 LP |
2882 | |
2883 | fputc('\n', f); | |
2884 | } | |
2885 | ||
57183d11 LP |
2886 | if (c->syscall_archs) { |
2887 | #ifdef HAVE_SECCOMP | |
2888 | Iterator j; | |
2889 | void *id; | |
2890 | #endif | |
2891 | ||
2892 | fprintf(f, | |
2893 | "%sSystemCallArchitectures:", | |
2894 | prefix); | |
2895 | ||
2896 | #ifdef HAVE_SECCOMP | |
2897 | SET_FOREACH(id, c->syscall_archs, j) | |
2898 | fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1))); | |
2899 | #endif | |
2900 | fputc('\n', f); | |
2901 | } | |
2902 | ||
b3267152 | 2903 | if (c->syscall_errno > 0) |
17df7223 LP |
2904 | fprintf(f, |
2905 | "%sSystemCallErrorNumber: %s\n", | |
2906 | prefix, strna(errno_to_name(c->syscall_errno))); | |
eef65bf3 MS |
2907 | |
2908 | if (c->apparmor_profile) | |
2909 | fprintf(f, | |
2910 | "%sAppArmorProfile: %s%s\n", | |
2911 | prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile); | |
5cb5a6ff LP |
2912 | } |
2913 | ||
a931ad47 LP |
2914 | bool exec_context_maintains_privileges(ExecContext *c) { |
2915 | assert(c); | |
2916 | ||
61233823 | 2917 | /* Returns true if the process forked off would run under |
a931ad47 LP |
2918 | * an unchanged UID or as root. */ |
2919 | ||
2920 | if (!c->user) | |
2921 | return true; | |
2922 | ||
2923 | if (streq(c->user, "root") || streq(c->user, "0")) | |
2924 | return true; | |
2925 | ||
2926 | return false; | |
2927 | } | |
2928 | ||
b58b4116 | 2929 | void exec_status_start(ExecStatus *s, pid_t pid) { |
034c6ed7 | 2930 | assert(s); |
5cb5a6ff | 2931 | |
b58b4116 LP |
2932 | zero(*s); |
2933 | s->pid = pid; | |
2934 | dual_timestamp_get(&s->start_timestamp); | |
2935 | } | |
2936 | ||
6ea832a2 | 2937 | void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) { |
b58b4116 LP |
2938 | assert(s); |
2939 | ||
0b1f4ae6 | 2940 | if (s->pid && s->pid != pid) |
b58b4116 LP |
2941 | zero(*s); |
2942 | ||
034c6ed7 | 2943 | s->pid = pid; |
63983207 | 2944 | dual_timestamp_get(&s->exit_timestamp); |
9fb86720 | 2945 | |
034c6ed7 LP |
2946 | s->code = code; |
2947 | s->status = status; | |
169c1bda | 2948 | |
6ea832a2 LP |
2949 | if (context) { |
2950 | if (context->utmp_id) | |
2951 | utmp_put_dead_process(context->utmp_id, pid, code, status); | |
2952 | ||
1e22b5cd | 2953 | exec_context_tty_reset(context, NULL); |
6ea832a2 | 2954 | } |
9fb86720 LP |
2955 | } |
2956 | ||
2957 | void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) { | |
2958 | char buf[FORMAT_TIMESTAMP_MAX]; | |
2959 | ||
2960 | assert(s); | |
2961 | assert(f); | |
2962 | ||
9fb86720 LP |
2963 | if (s->pid <= 0) |
2964 | return; | |
2965 | ||
4c940960 LP |
2966 | prefix = strempty(prefix); |
2967 | ||
9fb86720 | 2968 | fprintf(f, |
ccd06097 ZJS |
2969 | "%sPID: "PID_FMT"\n", |
2970 | prefix, s->pid); | |
9fb86720 | 2971 | |
63983207 | 2972 | if (s->start_timestamp.realtime > 0) |
9fb86720 LP |
2973 | fprintf(f, |
2974 | "%sStart Timestamp: %s\n", | |
63983207 | 2975 | prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime)); |
9fb86720 | 2976 | |
63983207 | 2977 | if (s->exit_timestamp.realtime > 0) |
9fb86720 LP |
2978 | fprintf(f, |
2979 | "%sExit Timestamp: %s\n" | |
2980 | "%sExit Code: %s\n" | |
2981 | "%sExit Status: %i\n", | |
63983207 | 2982 | prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime), |
9fb86720 LP |
2983 | prefix, sigchld_code_to_string(s->code), |
2984 | prefix, s->status); | |
5cb5a6ff | 2985 | } |
44d8db9e | 2986 | |
9e2f7c11 | 2987 | char *exec_command_line(char **argv) { |
44d8db9e LP |
2988 | size_t k; |
2989 | char *n, *p, **a; | |
2990 | bool first = true; | |
2991 | ||
9e2f7c11 | 2992 | assert(argv); |
44d8db9e | 2993 | |
9164977d | 2994 | k = 1; |
9e2f7c11 | 2995 | STRV_FOREACH(a, argv) |
44d8db9e LP |
2996 | k += strlen(*a)+3; |
2997 | ||
2998 | if (!(n = new(char, k))) | |
2999 | return NULL; | |
3000 | ||
3001 | p = n; | |
9e2f7c11 | 3002 | STRV_FOREACH(a, argv) { |
44d8db9e LP |
3003 | |
3004 | if (!first) | |
3005 | *(p++) = ' '; | |
3006 | else | |
3007 | first = false; | |
3008 | ||
3009 | if (strpbrk(*a, WHITESPACE)) { | |
3010 | *(p++) = '\''; | |
3011 | p = stpcpy(p, *a); | |
3012 | *(p++) = '\''; | |
3013 | } else | |
3014 | p = stpcpy(p, *a); | |
3015 | ||
3016 | } | |
3017 | ||
9164977d LP |
3018 | *p = 0; |
3019 | ||
44d8db9e LP |
3020 | /* FIXME: this doesn't really handle arguments that have |
3021 | * spaces and ticks in them */ | |
3022 | ||
3023 | return n; | |
3024 | } | |
3025 | ||
3026 | void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) { | |
e1d75803 | 3027 | _cleanup_free_ char *cmd = NULL; |
4c940960 | 3028 | const char *prefix2; |
44d8db9e LP |
3029 | |
3030 | assert(c); | |
3031 | assert(f); | |
3032 | ||
4c940960 | 3033 | prefix = strempty(prefix); |
63c372cb | 3034 | prefix2 = strjoina(prefix, "\t"); |
44d8db9e | 3035 | |
9e2f7c11 | 3036 | cmd = exec_command_line(c->argv); |
44d8db9e LP |
3037 | fprintf(f, |
3038 | "%sCommand Line: %s\n", | |
3039 | prefix, cmd ? cmd : strerror(ENOMEM)); | |
3040 | ||
9fb86720 | 3041 | exec_status_dump(&c->exec_status, f, prefix2); |
44d8db9e LP |
3042 | } |
3043 | ||
3044 | void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) { | |
3045 | assert(f); | |
3046 | ||
4c940960 | 3047 | prefix = strempty(prefix); |
44d8db9e LP |
3048 | |
3049 | LIST_FOREACH(command, c, c) | |
3050 | exec_command_dump(c, f, prefix); | |
3051 | } | |
94f04347 | 3052 | |
a6a80b4f LP |
3053 | void exec_command_append_list(ExecCommand **l, ExecCommand *e) { |
3054 | ExecCommand *end; | |
3055 | ||
3056 | assert(l); | |
3057 | assert(e); | |
3058 | ||
3059 | if (*l) { | |
35b8ca3a | 3060 | /* It's kind of important, that we keep the order here */ |
71fda00f LP |
3061 | LIST_FIND_TAIL(command, *l, end); |
3062 | LIST_INSERT_AFTER(command, *l, end, e); | |
a6a80b4f LP |
3063 | } else |
3064 | *l = e; | |
3065 | } | |
3066 | ||
26fd040d LP |
3067 | int exec_command_set(ExecCommand *c, const char *path, ...) { |
3068 | va_list ap; | |
3069 | char **l, *p; | |
3070 | ||
3071 | assert(c); | |
3072 | assert(path); | |
3073 | ||
3074 | va_start(ap, path); | |
3075 | l = strv_new_ap(path, ap); | |
3076 | va_end(ap); | |
3077 | ||
3078 | if (!l) | |
3079 | return -ENOMEM; | |
3080 | ||
250a918d LP |
3081 | p = strdup(path); |
3082 | if (!p) { | |
26fd040d LP |
3083 | strv_free(l); |
3084 | return -ENOMEM; | |
3085 | } | |
3086 | ||
3087 | free(c->path); | |
3088 | c->path = p; | |
3089 | ||
3090 | strv_free(c->argv); | |
3091 | c->argv = l; | |
3092 | ||
3093 | return 0; | |
3094 | } | |
3095 | ||
86b23b07 | 3096 | int exec_command_append(ExecCommand *c, const char *path, ...) { |
e63ff941 | 3097 | _cleanup_strv_free_ char **l = NULL; |
86b23b07 | 3098 | va_list ap; |
86b23b07 JS |
3099 | int r; |
3100 | ||
3101 | assert(c); | |
3102 | assert(path); | |
3103 | ||
3104 | va_start(ap, path); | |
3105 | l = strv_new_ap(path, ap); | |
3106 | va_end(ap); | |
3107 | ||
3108 | if (!l) | |
3109 | return -ENOMEM; | |
3110 | ||
e287086b | 3111 | r = strv_extend_strv(&c->argv, l, false); |
e63ff941 | 3112 | if (r < 0) |
86b23b07 | 3113 | return r; |
86b23b07 JS |
3114 | |
3115 | return 0; | |
3116 | } | |
3117 | ||
3118 | ||
613b411c LP |
3119 | static int exec_runtime_allocate(ExecRuntime **rt) { |
3120 | ||
3121 | if (*rt) | |
3122 | return 0; | |
3123 | ||
3124 | *rt = new0(ExecRuntime, 1); | |
f146f5e1 | 3125 | if (!*rt) |
613b411c LP |
3126 | return -ENOMEM; |
3127 | ||
3128 | (*rt)->n_ref = 1; | |
3129 | (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1; | |
3130 | ||
3131 | return 0; | |
3132 | } | |
3133 | ||
3134 | int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) { | |
3135 | int r; | |
3136 | ||
3137 | assert(rt); | |
3138 | assert(c); | |
3139 | assert(id); | |
3140 | ||
3141 | if (*rt) | |
3142 | return 1; | |
3143 | ||
3144 | if (!c->private_network && !c->private_tmp) | |
3145 | return 0; | |
3146 | ||
3147 | r = exec_runtime_allocate(rt); | |
3148 | if (r < 0) | |
3149 | return r; | |
3150 | ||
3151 | if (c->private_network && (*rt)->netns_storage_socket[0] < 0) { | |
33df919d | 3152 | if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, (*rt)->netns_storage_socket) < 0) |
613b411c LP |
3153 | return -errno; |
3154 | } | |
3155 | ||
3156 | if (c->private_tmp && !(*rt)->tmp_dir) { | |
3157 | r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir); | |
3158 | if (r < 0) | |
3159 | return r; | |
3160 | } | |
3161 | ||
3162 | return 1; | |
3163 | } | |
3164 | ||
3165 | ExecRuntime *exec_runtime_ref(ExecRuntime *r) { | |
3166 | assert(r); | |
3167 | assert(r->n_ref > 0); | |
3168 | ||
3169 | r->n_ref++; | |
3170 | return r; | |
3171 | } | |
3172 | ||
3173 | ExecRuntime *exec_runtime_unref(ExecRuntime *r) { | |
3174 | ||
3175 | if (!r) | |
3176 | return NULL; | |
3177 | ||
3178 | assert(r->n_ref > 0); | |
3179 | ||
3180 | r->n_ref--; | |
f2341e0a LP |
3181 | if (r->n_ref > 0) |
3182 | return NULL; | |
3183 | ||
3184 | free(r->tmp_dir); | |
3185 | free(r->var_tmp_dir); | |
3186 | safe_close_pair(r->netns_storage_socket); | |
3187 | free(r); | |
613b411c LP |
3188 | |
3189 | return NULL; | |
3190 | } | |
3191 | ||
f2341e0a | 3192 | int exec_runtime_serialize(Unit *u, ExecRuntime *rt, FILE *f, FDSet *fds) { |
613b411c LP |
3193 | assert(u); |
3194 | assert(f); | |
3195 | assert(fds); | |
3196 | ||
3197 | if (!rt) | |
3198 | return 0; | |
3199 | ||
3200 | if (rt->tmp_dir) | |
3201 | unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir); | |
3202 | ||
3203 | if (rt->var_tmp_dir) | |
3204 | unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir); | |
3205 | ||
3206 | if (rt->netns_storage_socket[0] >= 0) { | |
3207 | int copy; | |
3208 | ||
3209 | copy = fdset_put_dup(fds, rt->netns_storage_socket[0]); | |
3210 | if (copy < 0) | |
3211 | return copy; | |
3212 | ||
3213 | unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy); | |
3214 | } | |
3215 | ||
3216 | if (rt->netns_storage_socket[1] >= 0) { | |
3217 | int copy; | |
3218 | ||
3219 | copy = fdset_put_dup(fds, rt->netns_storage_socket[1]); | |
3220 | if (copy < 0) | |
3221 | return copy; | |
3222 | ||
3223 | unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy); | |
3224 | } | |
3225 | ||
3226 | return 0; | |
3227 | } | |
3228 | ||
f2341e0a | 3229 | int exec_runtime_deserialize_item(Unit *u, ExecRuntime **rt, const char *key, const char *value, FDSet *fds) { |
613b411c LP |
3230 | int r; |
3231 | ||
3232 | assert(rt); | |
3233 | assert(key); | |
3234 | assert(value); | |
3235 | ||
3236 | if (streq(key, "tmp-dir")) { | |
3237 | char *copy; | |
3238 | ||
3239 | r = exec_runtime_allocate(rt); | |
3240 | if (r < 0) | |
f2341e0a | 3241 | return log_oom(); |
613b411c LP |
3242 | |
3243 | copy = strdup(value); | |
3244 | if (!copy) | |
3245 | return log_oom(); | |
3246 | ||
3247 | free((*rt)->tmp_dir); | |
3248 | (*rt)->tmp_dir = copy; | |
3249 | ||
3250 | } else if (streq(key, "var-tmp-dir")) { | |
3251 | char *copy; | |
3252 | ||
3253 | r = exec_runtime_allocate(rt); | |
3254 | if (r < 0) | |
f2341e0a | 3255 | return log_oom(); |
613b411c LP |
3256 | |
3257 | copy = strdup(value); | |
3258 | if (!copy) | |
3259 | return log_oom(); | |
3260 | ||
3261 | free((*rt)->var_tmp_dir); | |
3262 | (*rt)->var_tmp_dir = copy; | |
3263 | ||
3264 | } else if (streq(key, "netns-socket-0")) { | |
3265 | int fd; | |
3266 | ||
3267 | r = exec_runtime_allocate(rt); | |
3268 | if (r < 0) | |
f2341e0a | 3269 | return log_oom(); |
613b411c LP |
3270 | |
3271 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 3272 | log_unit_debug(u, "Failed to parse netns socket value: %s", value); |
613b411c | 3273 | else { |
03e334a1 | 3274 | safe_close((*rt)->netns_storage_socket[0]); |
613b411c LP |
3275 | (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd); |
3276 | } | |
3277 | } else if (streq(key, "netns-socket-1")) { | |
3278 | int fd; | |
3279 | ||
3280 | r = exec_runtime_allocate(rt); | |
3281 | if (r < 0) | |
f2341e0a | 3282 | return log_oom(); |
613b411c LP |
3283 | |
3284 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 3285 | log_unit_debug(u, "Failed to parse netns socket value: %s", value); |
613b411c | 3286 | else { |
03e334a1 | 3287 | safe_close((*rt)->netns_storage_socket[1]); |
613b411c LP |
3288 | (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd); |
3289 | } | |
3290 | } else | |
3291 | return 0; | |
3292 | ||
3293 | return 1; | |
3294 | } | |
3295 | ||
3296 | static void *remove_tmpdir_thread(void *p) { | |
3297 | _cleanup_free_ char *path = p; | |
3298 | ||
c6878637 | 3299 | (void) rm_rf(path, REMOVE_ROOT|REMOVE_PHYSICAL); |
613b411c LP |
3300 | return NULL; |
3301 | } | |
3302 | ||
3303 | void exec_runtime_destroy(ExecRuntime *rt) { | |
98b47d54 LP |
3304 | int r; |
3305 | ||
613b411c LP |
3306 | if (!rt) |
3307 | return; | |
3308 | ||
3309 | /* If there are multiple users of this, let's leave the stuff around */ | |
3310 | if (rt->n_ref > 1) | |
3311 | return; | |
3312 | ||
3313 | if (rt->tmp_dir) { | |
3314 | log_debug("Spawning thread to nuke %s", rt->tmp_dir); | |
98b47d54 LP |
3315 | |
3316 | r = asynchronous_job(remove_tmpdir_thread, rt->tmp_dir); | |
3317 | if (r < 0) { | |
da927ba9 | 3318 | log_warning_errno(r, "Failed to nuke %s: %m", rt->tmp_dir); |
98b47d54 LP |
3319 | free(rt->tmp_dir); |
3320 | } | |
3321 | ||
613b411c LP |
3322 | rt->tmp_dir = NULL; |
3323 | } | |
3324 | ||
3325 | if (rt->var_tmp_dir) { | |
3326 | log_debug("Spawning thread to nuke %s", rt->var_tmp_dir); | |
98b47d54 LP |
3327 | |
3328 | r = asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir); | |
3329 | if (r < 0) { | |
da927ba9 | 3330 | log_warning_errno(r, "Failed to nuke %s: %m", rt->var_tmp_dir); |
98b47d54 LP |
3331 | free(rt->var_tmp_dir); |
3332 | } | |
3333 | ||
613b411c LP |
3334 | rt->var_tmp_dir = NULL; |
3335 | } | |
3336 | ||
3d94f76c | 3337 | safe_close_pair(rt->netns_storage_socket); |
613b411c LP |
3338 | } |
3339 | ||
80876c20 LP |
3340 | static const char* const exec_input_table[_EXEC_INPUT_MAX] = { |
3341 | [EXEC_INPUT_NULL] = "null", | |
3342 | [EXEC_INPUT_TTY] = "tty", | |
3343 | [EXEC_INPUT_TTY_FORCE] = "tty-force", | |
4f2d528d LP |
3344 | [EXEC_INPUT_TTY_FAIL] = "tty-fail", |
3345 | [EXEC_INPUT_SOCKET] = "socket" | |
80876c20 LP |
3346 | }; |
3347 | ||
8a0867d6 LP |
3348 | DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput); |
3349 | ||
94f04347 | 3350 | static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = { |
80876c20 | 3351 | [EXEC_OUTPUT_INHERIT] = "inherit", |
94f04347 | 3352 | [EXEC_OUTPUT_NULL] = "null", |
80876c20 | 3353 | [EXEC_OUTPUT_TTY] = "tty", |
94f04347 | 3354 | [EXEC_OUTPUT_SYSLOG] = "syslog", |
28dbc1e8 | 3355 | [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console", |
9a6bca7a | 3356 | [EXEC_OUTPUT_KMSG] = "kmsg", |
28dbc1e8 | 3357 | [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console", |
706343f4 LP |
3358 | [EXEC_OUTPUT_JOURNAL] = "journal", |
3359 | [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console", | |
4f2d528d | 3360 | [EXEC_OUTPUT_SOCKET] = "socket" |
94f04347 LP |
3361 | }; |
3362 | ||
3363 | DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput); | |
023a4f67 LP |
3364 | |
3365 | static const char* const exec_utmp_mode_table[_EXEC_UTMP_MODE_MAX] = { | |
3366 | [EXEC_UTMP_INIT] = "init", | |
3367 | [EXEC_UTMP_LOGIN] = "login", | |
3368 | [EXEC_UTMP_USER] = "user", | |
3369 | }; | |
3370 | ||
3371 | DEFINE_STRING_TABLE_LOOKUP(exec_utmp_mode, ExecUtmpMode); |