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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> |
d251207d | 28 | #include <sys/eventfd.h> |
f3e43635 | 29 | #include <sys/mman.h> |
8dd4c05b | 30 | #include <sys/personality.h> |
94f04347 | 31 | #include <sys/prctl.h> |
8dd4c05b | 32 | #include <sys/socket.h> |
451a074f | 33 | #include <sys/stat.h> |
8dd4c05b LP |
34 | #include <sys/un.h> |
35 | #include <unistd.h> | |
023a4f67 | 36 | #include <utmpx.h> |
5cb5a6ff | 37 | |
5b6319dc LP |
38 | #ifdef HAVE_PAM |
39 | #include <security/pam_appl.h> | |
40 | #endif | |
41 | ||
7b52a628 MS |
42 | #ifdef HAVE_SELINUX |
43 | #include <selinux/selinux.h> | |
44 | #endif | |
45 | ||
17df7223 LP |
46 | #ifdef HAVE_SECCOMP |
47 | #include <seccomp.h> | |
48 | #endif | |
49 | ||
eef65bf3 MS |
50 | #ifdef HAVE_APPARMOR |
51 | #include <sys/apparmor.h> | |
52 | #endif | |
53 | ||
24882e06 | 54 | #include "sd-messages.h" |
8dd4c05b LP |
55 | |
56 | #include "af-list.h" | |
b5efdb8a | 57 | #include "alloc-util.h" |
3ffd4af2 LP |
58 | #ifdef HAVE_APPARMOR |
59 | #include "apparmor-util.h" | |
60 | #endif | |
8dd4c05b LP |
61 | #include "async.h" |
62 | #include "barrier.h" | |
8dd4c05b | 63 | #include "cap-list.h" |
430f0182 | 64 | #include "capability-util.h" |
f6a6225e | 65 | #include "def.h" |
4d1a6904 | 66 | #include "env-util.h" |
17df7223 | 67 | #include "errno-list.h" |
3ffd4af2 | 68 | #include "execute.h" |
8dd4c05b | 69 | #include "exit-status.h" |
3ffd4af2 | 70 | #include "fd-util.h" |
8dd4c05b | 71 | #include "fileio.h" |
6482f626 | 72 | #include "formats-util.h" |
f4f15635 | 73 | #include "fs-util.h" |
7d50b32a | 74 | #include "glob-util.h" |
c004493c | 75 | #include "io-util.h" |
8dd4c05b LP |
76 | #include "ioprio.h" |
77 | #include "log.h" | |
78 | #include "macro.h" | |
79 | #include "missing.h" | |
80 | #include "mkdir.h" | |
81 | #include "namespace.h" | |
6bedfcbb | 82 | #include "parse-util.h" |
8dd4c05b | 83 | #include "path-util.h" |
0b452006 | 84 | #include "process-util.h" |
78f22b97 | 85 | #include "rlimit-util.h" |
8dd4c05b | 86 | #include "rm-rf.h" |
3ffd4af2 LP |
87 | #ifdef HAVE_SECCOMP |
88 | #include "seccomp-util.h" | |
89 | #endif | |
8dd4c05b LP |
90 | #include "securebits.h" |
91 | #include "selinux-util.h" | |
24882e06 | 92 | #include "signal-util.h" |
8dd4c05b | 93 | #include "smack-util.h" |
fd63e712 | 94 | #include "special.h" |
8b43440b | 95 | #include "string-table.h" |
07630cea | 96 | #include "string-util.h" |
8dd4c05b | 97 | #include "strv.h" |
7ccbd1ae | 98 | #include "syslog-util.h" |
8dd4c05b LP |
99 | #include "terminal-util.h" |
100 | #include "unit.h" | |
b1d4f8e1 | 101 | #include "user-util.h" |
8dd4c05b LP |
102 | #include "util.h" |
103 | #include "utmp-wtmp.h" | |
5cb5a6ff | 104 | |
e056b01d | 105 | #define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC) |
31a7eb86 | 106 | #define IDLE_TIMEOUT2_USEC (1*USEC_PER_SEC) |
e6a26745 | 107 | |
02a51aba LP |
108 | /* This assumes there is a 'tty' group */ |
109 | #define TTY_MODE 0620 | |
110 | ||
531dca78 LP |
111 | #define SNDBUF_SIZE (8*1024*1024) |
112 | ||
034c6ed7 LP |
113 | static int shift_fds(int fds[], unsigned n_fds) { |
114 | int start, restart_from; | |
115 | ||
116 | if (n_fds <= 0) | |
117 | return 0; | |
118 | ||
a0d40ac5 LP |
119 | /* Modifies the fds array! (sorts it) */ |
120 | ||
034c6ed7 LP |
121 | assert(fds); |
122 | ||
123 | start = 0; | |
124 | for (;;) { | |
125 | int i; | |
126 | ||
127 | restart_from = -1; | |
128 | ||
129 | for (i = start; i < (int) n_fds; i++) { | |
130 | int nfd; | |
131 | ||
132 | /* Already at right index? */ | |
133 | if (fds[i] == i+3) | |
134 | continue; | |
135 | ||
3cc2aff1 LP |
136 | nfd = fcntl(fds[i], F_DUPFD, i + 3); |
137 | if (nfd < 0) | |
034c6ed7 LP |
138 | return -errno; |
139 | ||
03e334a1 | 140 | safe_close(fds[i]); |
034c6ed7 LP |
141 | fds[i] = nfd; |
142 | ||
143 | /* Hmm, the fd we wanted isn't free? Then | |
ee33e53a | 144 | * let's remember that and try again from here */ |
034c6ed7 LP |
145 | if (nfd != i+3 && restart_from < 0) |
146 | restart_from = i; | |
147 | } | |
148 | ||
149 | if (restart_from < 0) | |
150 | break; | |
151 | ||
152 | start = restart_from; | |
153 | } | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
c2748801 | 158 | static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) { |
47a71eed | 159 | unsigned i; |
e2c76839 | 160 | int r; |
47a71eed LP |
161 | |
162 | if (n_fds <= 0) | |
163 | return 0; | |
164 | ||
165 | assert(fds); | |
166 | ||
451a074f | 167 | /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */ |
47a71eed LP |
168 | |
169 | for (i = 0; i < n_fds; i++) { | |
47a71eed | 170 | |
3cc2aff1 LP |
171 | r = fd_nonblock(fds[i], nonblock); |
172 | if (r < 0) | |
e2c76839 | 173 | return r; |
47a71eed | 174 | |
451a074f LP |
175 | /* We unconditionally drop FD_CLOEXEC from the fds, |
176 | * since after all we want to pass these fds to our | |
177 | * children */ | |
47a71eed | 178 | |
3cc2aff1 LP |
179 | r = fd_cloexec(fds[i], false); |
180 | if (r < 0) | |
e2c76839 | 181 | return r; |
47a71eed LP |
182 | } |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
1e22b5cd | 187 | static const char *exec_context_tty_path(const ExecContext *context) { |
80876c20 LP |
188 | assert(context); |
189 | ||
1e22b5cd LP |
190 | if (context->stdio_as_fds) |
191 | return NULL; | |
192 | ||
80876c20 LP |
193 | if (context->tty_path) |
194 | return context->tty_path; | |
195 | ||
196 | return "/dev/console"; | |
197 | } | |
198 | ||
1e22b5cd LP |
199 | static void exec_context_tty_reset(const ExecContext *context, const ExecParameters *p) { |
200 | const char *path; | |
201 | ||
6ea832a2 LP |
202 | assert(context); |
203 | ||
1e22b5cd | 204 | path = exec_context_tty_path(context); |
6ea832a2 | 205 | |
1e22b5cd LP |
206 | if (context->tty_vhangup) { |
207 | if (p && p->stdin_fd >= 0) | |
208 | (void) terminal_vhangup_fd(p->stdin_fd); | |
209 | else if (path) | |
210 | (void) terminal_vhangup(path); | |
211 | } | |
6ea832a2 | 212 | |
1e22b5cd LP |
213 | if (context->tty_reset) { |
214 | if (p && p->stdin_fd >= 0) | |
215 | (void) reset_terminal_fd(p->stdin_fd, true); | |
216 | else if (path) | |
217 | (void) reset_terminal(path); | |
218 | } | |
219 | ||
220 | if (context->tty_vt_disallocate && path) | |
221 | (void) vt_disallocate(path); | |
6ea832a2 LP |
222 | } |
223 | ||
6af760f3 LP |
224 | static bool is_terminal_input(ExecInput i) { |
225 | return IN_SET(i, | |
226 | EXEC_INPUT_TTY, | |
227 | EXEC_INPUT_TTY_FORCE, | |
228 | EXEC_INPUT_TTY_FAIL); | |
229 | } | |
230 | ||
3a1286b6 | 231 | static bool is_terminal_output(ExecOutput o) { |
6af760f3 LP |
232 | return IN_SET(o, |
233 | EXEC_OUTPUT_TTY, | |
234 | EXEC_OUTPUT_SYSLOG_AND_CONSOLE, | |
235 | EXEC_OUTPUT_KMSG_AND_CONSOLE, | |
236 | EXEC_OUTPUT_JOURNAL_AND_CONSOLE); | |
237 | } | |
238 | ||
239 | static bool exec_context_needs_term(const ExecContext *c) { | |
240 | assert(c); | |
241 | ||
242 | /* Return true if the execution context suggests we should set $TERM to something useful. */ | |
243 | ||
244 | if (is_terminal_input(c->std_input)) | |
245 | return true; | |
246 | ||
247 | if (is_terminal_output(c->std_output)) | |
248 | return true; | |
249 | ||
250 | if (is_terminal_output(c->std_error)) | |
251 | return true; | |
252 | ||
253 | return !!c->tty_path; | |
3a1286b6 MS |
254 | } |
255 | ||
80876c20 LP |
256 | static int open_null_as(int flags, int nfd) { |
257 | int fd, r; | |
071830ff | 258 | |
80876c20 | 259 | assert(nfd >= 0); |
071830ff | 260 | |
613b411c LP |
261 | fd = open("/dev/null", flags|O_NOCTTY); |
262 | if (fd < 0) | |
071830ff LP |
263 | return -errno; |
264 | ||
80876c20 LP |
265 | if (fd != nfd) { |
266 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 267 | safe_close(fd); |
80876c20 LP |
268 | } else |
269 | r = nfd; | |
071830ff | 270 | |
80876c20 | 271 | return r; |
071830ff LP |
272 | } |
273 | ||
524daa8c | 274 | static int connect_journal_socket(int fd, uid_t uid, gid_t gid) { |
b92bea5d ZJS |
275 | union sockaddr_union sa = { |
276 | .un.sun_family = AF_UNIX, | |
277 | .un.sun_path = "/run/systemd/journal/stdout", | |
278 | }; | |
524daa8c ZJS |
279 | uid_t olduid = UID_INVALID; |
280 | gid_t oldgid = GID_INVALID; | |
281 | int r; | |
282 | ||
283 | if (gid != GID_INVALID) { | |
284 | oldgid = getgid(); | |
285 | ||
286 | r = setegid(gid); | |
287 | if (r < 0) | |
288 | return -errno; | |
289 | } | |
290 | ||
291 | if (uid != UID_INVALID) { | |
292 | olduid = getuid(); | |
293 | ||
294 | r = seteuid(uid); | |
295 | if (r < 0) { | |
296 | r = -errno; | |
297 | goto restore_gid; | |
298 | } | |
299 | } | |
300 | ||
fc2fffe7 | 301 | r = connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)); |
524daa8c ZJS |
302 | if (r < 0) |
303 | r = -errno; | |
304 | ||
305 | /* If we fail to restore the uid or gid, things will likely | |
306 | fail later on. This should only happen if an LSM interferes. */ | |
307 | ||
308 | if (uid != UID_INVALID) | |
309 | (void) seteuid(olduid); | |
310 | ||
311 | restore_gid: | |
312 | if (gid != GID_INVALID) | |
313 | (void) setegid(oldgid); | |
314 | ||
315 | return r; | |
316 | } | |
317 | ||
fd1f9c89 | 318 | static int connect_logger_as( |
7a1ab780 | 319 | Unit *unit, |
fd1f9c89 LP |
320 | const ExecContext *context, |
321 | ExecOutput output, | |
322 | const char *ident, | |
fd1f9c89 LP |
323 | int nfd, |
324 | uid_t uid, | |
325 | gid_t gid) { | |
326 | ||
524daa8c | 327 | int fd, r; |
071830ff LP |
328 | |
329 | assert(context); | |
80876c20 LP |
330 | assert(output < _EXEC_OUTPUT_MAX); |
331 | assert(ident); | |
332 | assert(nfd >= 0); | |
071830ff | 333 | |
54fe0cdb LP |
334 | fd = socket(AF_UNIX, SOCK_STREAM, 0); |
335 | if (fd < 0) | |
80876c20 | 336 | return -errno; |
071830ff | 337 | |
524daa8c ZJS |
338 | r = connect_journal_socket(fd, uid, gid); |
339 | if (r < 0) | |
340 | return r; | |
071830ff | 341 | |
80876c20 | 342 | if (shutdown(fd, SHUT_RD) < 0) { |
03e334a1 | 343 | safe_close(fd); |
80876c20 LP |
344 | return -errno; |
345 | } | |
071830ff | 346 | |
fd1f9c89 | 347 | (void) fd_inc_sndbuf(fd, SNDBUF_SIZE); |
531dca78 | 348 | |
80876c20 | 349 | dprintf(fd, |
62bca2c6 | 350 | "%s\n" |
80876c20 LP |
351 | "%s\n" |
352 | "%i\n" | |
54fe0cdb LP |
353 | "%i\n" |
354 | "%i\n" | |
355 | "%i\n" | |
4f4a1dbf | 356 | "%i\n", |
4f4a1dbf | 357 | context->syslog_identifier ? context->syslog_identifier : ident, |
7a1ab780 | 358 | unit->id, |
54fe0cdb LP |
359 | context->syslog_priority, |
360 | !!context->syslog_level_prefix, | |
361 | output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE, | |
362 | output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE, | |
3a1286b6 | 363 | is_terminal_output(output)); |
80876c20 | 364 | |
fd1f9c89 LP |
365 | if (fd == nfd) |
366 | return nfd; | |
367 | ||
368 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
369 | safe_close(fd); | |
071830ff | 370 | |
80876c20 LP |
371 | return r; |
372 | } | |
373 | static int open_terminal_as(const char *path, mode_t mode, int nfd) { | |
374 | int fd, r; | |
071830ff | 375 | |
80876c20 LP |
376 | assert(path); |
377 | assert(nfd >= 0); | |
071830ff | 378 | |
3cc2aff1 LP |
379 | fd = open_terminal(path, mode | O_NOCTTY); |
380 | if (fd < 0) | |
80876c20 | 381 | return fd; |
071830ff | 382 | |
80876c20 LP |
383 | if (fd != nfd) { |
384 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 385 | safe_close(fd); |
80876c20 LP |
386 | } else |
387 | r = nfd; | |
071830ff | 388 | |
80876c20 LP |
389 | return r; |
390 | } | |
071830ff | 391 | |
1e3ad081 LP |
392 | static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) { |
393 | ||
394 | if (is_terminal_input(std_input) && !apply_tty_stdin) | |
395 | return EXEC_INPUT_NULL; | |
071830ff | 396 | |
03fd9c49 | 397 | if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0) |
4f2d528d LP |
398 | return EXEC_INPUT_NULL; |
399 | ||
03fd9c49 | 400 | return std_input; |
4f2d528d LP |
401 | } |
402 | ||
03fd9c49 | 403 | static int fixup_output(ExecOutput std_output, int socket_fd) { |
4f2d528d | 404 | |
03fd9c49 | 405 | if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0) |
4f2d528d LP |
406 | return EXEC_OUTPUT_INHERIT; |
407 | ||
03fd9c49 | 408 | return std_output; |
4f2d528d LP |
409 | } |
410 | ||
a34ceba6 LP |
411 | static int setup_input( |
412 | const ExecContext *context, | |
413 | const ExecParameters *params, | |
414 | int socket_fd) { | |
415 | ||
4f2d528d LP |
416 | ExecInput i; |
417 | ||
418 | assert(context); | |
a34ceba6 LP |
419 | assert(params); |
420 | ||
421 | if (params->stdin_fd >= 0) { | |
422 | if (dup2(params->stdin_fd, STDIN_FILENO) < 0) | |
423 | return -errno; | |
424 | ||
425 | /* Try to make this the controlling tty, if it is a tty, and reset it */ | |
426 | (void) ioctl(STDIN_FILENO, TIOCSCTTY, context->std_input == EXEC_INPUT_TTY_FORCE); | |
427 | (void) reset_terminal_fd(STDIN_FILENO, true); | |
428 | ||
429 | return STDIN_FILENO; | |
430 | } | |
4f2d528d | 431 | |
c39f1ce2 | 432 | i = fixup_input(context->std_input, socket_fd, params->flags & EXEC_APPLY_TTY_STDIN); |
4f2d528d LP |
433 | |
434 | switch (i) { | |
071830ff | 435 | |
80876c20 LP |
436 | case EXEC_INPUT_NULL: |
437 | return open_null_as(O_RDONLY, STDIN_FILENO); | |
438 | ||
439 | case EXEC_INPUT_TTY: | |
440 | case EXEC_INPUT_TTY_FORCE: | |
441 | case EXEC_INPUT_TTY_FAIL: { | |
442 | int fd, r; | |
071830ff | 443 | |
1e22b5cd | 444 | fd = acquire_terminal(exec_context_tty_path(context), |
970edce6 ZJS |
445 | i == EXEC_INPUT_TTY_FAIL, |
446 | i == EXEC_INPUT_TTY_FORCE, | |
447 | false, | |
3a43da28 | 448 | USEC_INFINITY); |
970edce6 | 449 | if (fd < 0) |
80876c20 LP |
450 | return fd; |
451 | ||
452 | if (fd != STDIN_FILENO) { | |
453 | r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
03e334a1 | 454 | safe_close(fd); |
80876c20 LP |
455 | } else |
456 | r = STDIN_FILENO; | |
457 | ||
458 | return r; | |
459 | } | |
460 | ||
4f2d528d LP |
461 | case EXEC_INPUT_SOCKET: |
462 | return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
463 | ||
80876c20 LP |
464 | default: |
465 | assert_not_reached("Unknown input type"); | |
466 | } | |
467 | } | |
468 | ||
a34ceba6 LP |
469 | static int setup_output( |
470 | Unit *unit, | |
471 | const ExecContext *context, | |
472 | const ExecParameters *params, | |
473 | int fileno, | |
474 | int socket_fd, | |
475 | const char *ident, | |
7bce046b LP |
476 | uid_t uid, |
477 | gid_t gid, | |
478 | dev_t *journal_stream_dev, | |
479 | ino_t *journal_stream_ino) { | |
a34ceba6 | 480 | |
4f2d528d LP |
481 | ExecOutput o; |
482 | ExecInput i; | |
47c1d80d | 483 | int r; |
4f2d528d | 484 | |
f2341e0a | 485 | assert(unit); |
80876c20 | 486 | assert(context); |
a34ceba6 | 487 | assert(params); |
80876c20 | 488 | assert(ident); |
7bce046b LP |
489 | assert(journal_stream_dev); |
490 | assert(journal_stream_ino); | |
80876c20 | 491 | |
a34ceba6 LP |
492 | if (fileno == STDOUT_FILENO && params->stdout_fd >= 0) { |
493 | ||
494 | if (dup2(params->stdout_fd, STDOUT_FILENO) < 0) | |
495 | return -errno; | |
496 | ||
497 | return STDOUT_FILENO; | |
498 | } | |
499 | ||
500 | if (fileno == STDERR_FILENO && params->stderr_fd >= 0) { | |
501 | if (dup2(params->stderr_fd, STDERR_FILENO) < 0) | |
502 | return -errno; | |
503 | ||
504 | return STDERR_FILENO; | |
505 | } | |
506 | ||
c39f1ce2 | 507 | i = fixup_input(context->std_input, socket_fd, params->flags & EXEC_APPLY_TTY_STDIN); |
03fd9c49 | 508 | o = fixup_output(context->std_output, socket_fd); |
4f2d528d | 509 | |
eb17e935 MS |
510 | if (fileno == STDERR_FILENO) { |
511 | ExecOutput e; | |
512 | e = fixup_output(context->std_error, socket_fd); | |
80876c20 | 513 | |
eb17e935 MS |
514 | /* This expects the input and output are already set up */ |
515 | ||
516 | /* Don't change the stderr file descriptor if we inherit all | |
517 | * the way and are not on a tty */ | |
518 | if (e == EXEC_OUTPUT_INHERIT && | |
519 | o == EXEC_OUTPUT_INHERIT && | |
520 | i == EXEC_INPUT_NULL && | |
521 | !is_terminal_input(context->std_input) && | |
522 | getppid () != 1) | |
523 | return fileno; | |
524 | ||
525 | /* Duplicate from stdout if possible */ | |
526 | if (e == o || e == EXEC_OUTPUT_INHERIT) | |
527 | return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno; | |
071830ff | 528 | |
eb17e935 | 529 | o = e; |
80876c20 | 530 | |
eb17e935 | 531 | } else if (o == EXEC_OUTPUT_INHERIT) { |
21d21ea4 LP |
532 | /* If input got downgraded, inherit the original value */ |
533 | if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input)) | |
1e22b5cd | 534 | return open_terminal_as(exec_context_tty_path(context), O_WRONLY, fileno); |
21d21ea4 | 535 | |
acb591e4 | 536 | /* If the input is connected to anything that's not a /dev/null, inherit that... */ |
ff876e28 | 537 | if (i != EXEC_INPUT_NULL) |
eb17e935 | 538 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; |
071830ff | 539 | |
acb591e4 LP |
540 | /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */ |
541 | if (getppid() != 1) | |
eb17e935 | 542 | return fileno; |
94f04347 | 543 | |
eb17e935 MS |
544 | /* We need to open /dev/null here anew, to get the right access mode. */ |
545 | return open_null_as(O_WRONLY, fileno); | |
071830ff | 546 | } |
94f04347 | 547 | |
eb17e935 | 548 | switch (o) { |
80876c20 LP |
549 | |
550 | case EXEC_OUTPUT_NULL: | |
eb17e935 | 551 | return open_null_as(O_WRONLY, fileno); |
80876c20 LP |
552 | |
553 | case EXEC_OUTPUT_TTY: | |
4f2d528d | 554 | if (is_terminal_input(i)) |
eb17e935 | 555 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; |
80876c20 LP |
556 | |
557 | /* We don't reset the terminal if this is just about output */ | |
1e22b5cd | 558 | return open_terminal_as(exec_context_tty_path(context), O_WRONLY, fileno); |
80876c20 LP |
559 | |
560 | case EXEC_OUTPUT_SYSLOG: | |
28dbc1e8 | 561 | case EXEC_OUTPUT_SYSLOG_AND_CONSOLE: |
9a6bca7a | 562 | case EXEC_OUTPUT_KMSG: |
28dbc1e8 | 563 | case EXEC_OUTPUT_KMSG_AND_CONSOLE: |
706343f4 LP |
564 | case EXEC_OUTPUT_JOURNAL: |
565 | case EXEC_OUTPUT_JOURNAL_AND_CONSOLE: | |
7a1ab780 | 566 | r = connect_logger_as(unit, context, o, ident, fileno, uid, gid); |
47c1d80d | 567 | if (r < 0) { |
f2341e0a | 568 | log_unit_error_errno(unit, r, "Failed to connect %s to the journal socket, ignoring: %m", fileno == STDOUT_FILENO ? "stdout" : "stderr"); |
eb17e935 | 569 | r = open_null_as(O_WRONLY, fileno); |
7bce046b LP |
570 | } else { |
571 | struct stat st; | |
572 | ||
573 | /* If we connected this fd to the journal via a stream, patch the device/inode into the passed | |
574 | * parameters, but only then. This is useful so that we can set $JOURNAL_STREAM that permits | |
575 | * services to detect whether they are connected to the journal or not. */ | |
576 | ||
577 | if (fstat(fileno, &st) >= 0) { | |
578 | *journal_stream_dev = st.st_dev; | |
579 | *journal_stream_ino = st.st_ino; | |
580 | } | |
47c1d80d MS |
581 | } |
582 | return r; | |
4f2d528d LP |
583 | |
584 | case EXEC_OUTPUT_SOCKET: | |
585 | assert(socket_fd >= 0); | |
eb17e935 | 586 | return dup2(socket_fd, fileno) < 0 ? -errno : fileno; |
94f04347 LP |
587 | |
588 | default: | |
80876c20 | 589 | assert_not_reached("Unknown error type"); |
94f04347 | 590 | } |
071830ff LP |
591 | } |
592 | ||
02a51aba LP |
593 | static int chown_terminal(int fd, uid_t uid) { |
594 | struct stat st; | |
595 | ||
596 | assert(fd >= 0); | |
02a51aba | 597 | |
1ff74fb6 LP |
598 | /* Before we chown/chmod the TTY, let's ensure this is actually a tty */ |
599 | if (isatty(fd) < 1) | |
600 | return 0; | |
601 | ||
02a51aba | 602 | /* This might fail. What matters are the results. */ |
bab45044 LP |
603 | (void) fchown(fd, uid, -1); |
604 | (void) fchmod(fd, TTY_MODE); | |
02a51aba LP |
605 | |
606 | if (fstat(fd, &st) < 0) | |
607 | return -errno; | |
608 | ||
d8b4e2e9 | 609 | if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE) |
02a51aba LP |
610 | return -EPERM; |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
3d18b167 LP |
615 | static int setup_confirm_stdio(int *_saved_stdin, int *_saved_stdout) { |
616 | _cleanup_close_ int fd = -1, saved_stdin = -1, saved_stdout = -1; | |
617 | int r; | |
80876c20 | 618 | |
80876c20 LP |
619 | assert(_saved_stdin); |
620 | assert(_saved_stdout); | |
621 | ||
af6da548 LP |
622 | saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3); |
623 | if (saved_stdin < 0) | |
624 | return -errno; | |
80876c20 | 625 | |
af6da548 | 626 | saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3); |
3d18b167 LP |
627 | if (saved_stdout < 0) |
628 | return -errno; | |
80876c20 | 629 | |
af6da548 LP |
630 | fd = acquire_terminal( |
631 | "/dev/console", | |
632 | false, | |
633 | false, | |
634 | false, | |
635 | DEFAULT_CONFIRM_USEC); | |
3d18b167 LP |
636 | if (fd < 0) |
637 | return fd; | |
80876c20 | 638 | |
af6da548 LP |
639 | r = chown_terminal(fd, getuid()); |
640 | if (r < 0) | |
3d18b167 | 641 | return r; |
02a51aba | 642 | |
3d18b167 LP |
643 | r = reset_terminal_fd(fd, true); |
644 | if (r < 0) | |
645 | return r; | |
80876c20 | 646 | |
3d18b167 LP |
647 | if (dup2(fd, STDIN_FILENO) < 0) |
648 | return -errno; | |
649 | ||
650 | if (dup2(fd, STDOUT_FILENO) < 0) | |
651 | return -errno; | |
80876c20 LP |
652 | |
653 | if (fd >= 2) | |
03e334a1 | 654 | safe_close(fd); |
3d18b167 | 655 | fd = -1; |
80876c20 LP |
656 | |
657 | *_saved_stdin = saved_stdin; | |
658 | *_saved_stdout = saved_stdout; | |
659 | ||
3d18b167 | 660 | saved_stdin = saved_stdout = -1; |
80876c20 | 661 | |
3d18b167 | 662 | return 0; |
80876c20 LP |
663 | } |
664 | ||
44b601bc | 665 | _printf_(1, 2) static int write_confirm_message(const char *format, ...) { |
03e334a1 | 666 | _cleanup_close_ int fd = -1; |
af6da548 | 667 | va_list ap; |
80876c20 | 668 | |
af6da548 | 669 | assert(format); |
80876c20 | 670 | |
af6da548 LP |
671 | fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); |
672 | if (fd < 0) | |
673 | return fd; | |
80876c20 | 674 | |
af6da548 LP |
675 | va_start(ap, format); |
676 | vdprintf(fd, format, ap); | |
677 | va_end(ap); | |
80876c20 | 678 | |
af6da548 LP |
679 | return 0; |
680 | } | |
80876c20 | 681 | |
3d18b167 | 682 | static int restore_confirm_stdio(int *saved_stdin, int *saved_stdout) { |
af6da548 | 683 | int r = 0; |
80876c20 | 684 | |
af6da548 LP |
685 | assert(saved_stdin); |
686 | assert(saved_stdout); | |
687 | ||
688 | release_terminal(); | |
689 | ||
690 | if (*saved_stdin >= 0) | |
80876c20 | 691 | if (dup2(*saved_stdin, STDIN_FILENO) < 0) |
af6da548 | 692 | r = -errno; |
80876c20 | 693 | |
af6da548 | 694 | if (*saved_stdout >= 0) |
80876c20 | 695 | if (dup2(*saved_stdout, STDOUT_FILENO) < 0) |
af6da548 | 696 | r = -errno; |
80876c20 | 697 | |
3d18b167 LP |
698 | *saved_stdin = safe_close(*saved_stdin); |
699 | *saved_stdout = safe_close(*saved_stdout); | |
af6da548 LP |
700 | |
701 | return r; | |
702 | } | |
703 | ||
704 | static int ask_for_confirmation(char *response, char **argv) { | |
705 | int saved_stdout = -1, saved_stdin = -1, r; | |
e1d75803 | 706 | _cleanup_free_ char *line = NULL; |
af6da548 LP |
707 | |
708 | r = setup_confirm_stdio(&saved_stdin, &saved_stdout); | |
709 | if (r < 0) | |
710 | return r; | |
711 | ||
712 | line = exec_command_line(argv); | |
713 | if (!line) | |
714 | return -ENOMEM; | |
715 | ||
418b9be5 | 716 | r = ask_char(response, "yns", "Execute %s? [Yes, No, Skip] ", line); |
af6da548 LP |
717 | |
718 | restore_confirm_stdio(&saved_stdin, &saved_stdout); | |
719 | ||
720 | return r; | |
80876c20 LP |
721 | } |
722 | ||
81a2b7ce LP |
723 | static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) { |
724 | bool keep_groups = false; | |
725 | int r; | |
726 | ||
727 | assert(context); | |
728 | ||
35b8ca3a | 729 | /* Lookup and set GID and supplementary group list. Here too |
81a2b7ce LP |
730 | * we avoid NSS lookups for gid=0. */ |
731 | ||
732 | if (context->group || username) { | |
81a2b7ce LP |
733 | /* First step, initialize groups from /etc/groups */ |
734 | if (username && gid != 0) { | |
735 | if (initgroups(username, gid) < 0) | |
736 | return -errno; | |
737 | ||
738 | keep_groups = true; | |
739 | } | |
740 | ||
741 | /* Second step, set our gids */ | |
742 | if (setresgid(gid, gid, gid) < 0) | |
743 | return -errno; | |
744 | } | |
745 | ||
746 | if (context->supplementary_groups) { | |
747 | int ngroups_max, k; | |
748 | gid_t *gids; | |
749 | char **i; | |
750 | ||
751 | /* Final step, initialize any manually set supplementary groups */ | |
da19d5c1 | 752 | assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0); |
81a2b7ce LP |
753 | |
754 | if (!(gids = new(gid_t, ngroups_max))) | |
755 | return -ENOMEM; | |
756 | ||
757 | if (keep_groups) { | |
3cc2aff1 LP |
758 | k = getgroups(ngroups_max, gids); |
759 | if (k < 0) { | |
81a2b7ce LP |
760 | free(gids); |
761 | return -errno; | |
762 | } | |
763 | } else | |
764 | k = 0; | |
765 | ||
766 | STRV_FOREACH(i, context->supplementary_groups) { | |
4b67834e | 767 | const char *g; |
81a2b7ce LP |
768 | |
769 | if (k >= ngroups_max) { | |
770 | free(gids); | |
771 | return -E2BIG; | |
772 | } | |
773 | ||
4b67834e LP |
774 | g = *i; |
775 | r = get_group_creds(&g, gids+k); | |
776 | if (r < 0) { | |
81a2b7ce LP |
777 | free(gids); |
778 | return r; | |
779 | } | |
780 | ||
781 | k++; | |
782 | } | |
783 | ||
97f0e76f LP |
784 | r = maybe_setgroups(k, gids); |
785 | if (r < 0) { | |
81a2b7ce | 786 | free(gids); |
97f0e76f | 787 | return r; |
81a2b7ce LP |
788 | } |
789 | ||
790 | free(gids); | |
791 | } | |
792 | ||
793 | return 0; | |
794 | } | |
795 | ||
796 | static int enforce_user(const ExecContext *context, uid_t uid) { | |
81a2b7ce LP |
797 | assert(context); |
798 | ||
479050b3 | 799 | /* Sets (but doesn't look up) the uid and make sure we keep the |
81a2b7ce LP |
800 | * capabilities while doing so. */ |
801 | ||
479050b3 | 802 | if (context->capability_ambient_set != 0) { |
81a2b7ce LP |
803 | |
804 | /* First step: If we need to keep capabilities but | |
805 | * drop privileges we need to make sure we keep our | |
cbb21cca | 806 | * caps, while we drop privileges. */ |
693ced48 | 807 | if (uid != 0) { |
cbb21cca | 808 | int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS; |
693ced48 LP |
809 | |
810 | if (prctl(PR_GET_SECUREBITS) != sb) | |
811 | if (prctl(PR_SET_SECUREBITS, sb) < 0) | |
812 | return -errno; | |
813 | } | |
81a2b7ce LP |
814 | } |
815 | ||
479050b3 | 816 | /* Second step: actually set the uids */ |
81a2b7ce LP |
817 | if (setresuid(uid, uid, uid) < 0) |
818 | return -errno; | |
819 | ||
820 | /* At this point we should have all necessary capabilities but | |
821 | are otherwise a normal user. However, the caps might got | |
822 | corrupted due to the setresuid() so we need clean them up | |
823 | later. This is done outside of this call. */ | |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
5b6319dc LP |
828 | #ifdef HAVE_PAM |
829 | ||
830 | static int null_conv( | |
831 | int num_msg, | |
832 | const struct pam_message **msg, | |
833 | struct pam_response **resp, | |
834 | void *appdata_ptr) { | |
835 | ||
836 | /* We don't support conversations */ | |
837 | ||
838 | return PAM_CONV_ERR; | |
839 | } | |
840 | ||
cefc33ae LP |
841 | #endif |
842 | ||
5b6319dc LP |
843 | static int setup_pam( |
844 | const char *name, | |
845 | const char *user, | |
940c5210 | 846 | uid_t uid, |
2d6fce8d | 847 | gid_t gid, |
5b6319dc | 848 | const char *tty, |
2065ca69 | 849 | char ***env, |
5b6319dc LP |
850 | int fds[], unsigned n_fds) { |
851 | ||
cefc33ae LP |
852 | #ifdef HAVE_PAM |
853 | ||
5b6319dc LP |
854 | static const struct pam_conv conv = { |
855 | .conv = null_conv, | |
856 | .appdata_ptr = NULL | |
857 | }; | |
858 | ||
2d7c6aa2 | 859 | _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL; |
5b6319dc | 860 | pam_handle_t *handle = NULL; |
d6e5f3ad | 861 | sigset_t old_ss; |
7bb70b6e | 862 | int pam_code = PAM_SUCCESS, r; |
84eada2f | 863 | char **nv, **e = NULL; |
5b6319dc LP |
864 | bool close_session = false; |
865 | pid_t pam_pid = 0, parent_pid; | |
970edce6 | 866 | int flags = 0; |
5b6319dc LP |
867 | |
868 | assert(name); | |
869 | assert(user); | |
2065ca69 | 870 | assert(env); |
5b6319dc LP |
871 | |
872 | /* We set up PAM in the parent process, then fork. The child | |
35b8ca3a | 873 | * will then stay around until killed via PR_GET_PDEATHSIG or |
5b6319dc LP |
874 | * systemd via the cgroup logic. It will then remove the PAM |
875 | * session again. The parent process will exec() the actual | |
876 | * daemon. We do things this way to ensure that the main PID | |
877 | * of the daemon is the one we initially fork()ed. */ | |
878 | ||
7bb70b6e LP |
879 | r = barrier_create(&barrier); |
880 | if (r < 0) | |
2d7c6aa2 DH |
881 | goto fail; |
882 | ||
553d2243 | 883 | if (log_get_max_level() < LOG_DEBUG) |
970edce6 ZJS |
884 | flags |= PAM_SILENT; |
885 | ||
f546241b ZJS |
886 | pam_code = pam_start(name, user, &conv, &handle); |
887 | if (pam_code != PAM_SUCCESS) { | |
5b6319dc LP |
888 | handle = NULL; |
889 | goto fail; | |
890 | } | |
891 | ||
f546241b ZJS |
892 | if (tty) { |
893 | pam_code = pam_set_item(handle, PAM_TTY, tty); | |
894 | if (pam_code != PAM_SUCCESS) | |
5b6319dc | 895 | goto fail; |
f546241b | 896 | } |
5b6319dc | 897 | |
84eada2f JW |
898 | STRV_FOREACH(nv, *env) { |
899 | pam_code = pam_putenv(handle, *nv); | |
2065ca69 JW |
900 | if (pam_code != PAM_SUCCESS) |
901 | goto fail; | |
902 | } | |
903 | ||
970edce6 | 904 | pam_code = pam_acct_mgmt(handle, flags); |
f546241b | 905 | if (pam_code != PAM_SUCCESS) |
5b6319dc LP |
906 | goto fail; |
907 | ||
970edce6 | 908 | pam_code = pam_open_session(handle, flags); |
f546241b | 909 | if (pam_code != PAM_SUCCESS) |
5b6319dc LP |
910 | goto fail; |
911 | ||
912 | close_session = true; | |
913 | ||
f546241b ZJS |
914 | e = pam_getenvlist(handle); |
915 | if (!e) { | |
5b6319dc LP |
916 | pam_code = PAM_BUF_ERR; |
917 | goto fail; | |
918 | } | |
919 | ||
920 | /* Block SIGTERM, so that we know that it won't get lost in | |
921 | * the child */ | |
ce30c8dc | 922 | |
72c0a2c2 | 923 | assert_se(sigprocmask_many(SIG_BLOCK, &old_ss, SIGTERM, -1) >= 0); |
5b6319dc LP |
924 | |
925 | parent_pid = getpid(); | |
926 | ||
f546241b | 927 | pam_pid = fork(); |
7bb70b6e LP |
928 | if (pam_pid < 0) { |
929 | r = -errno; | |
5b6319dc | 930 | goto fail; |
7bb70b6e | 931 | } |
5b6319dc LP |
932 | |
933 | if (pam_pid == 0) { | |
7bb70b6e | 934 | int sig, ret = EXIT_PAM; |
5b6319dc LP |
935 | |
936 | /* The child's job is to reset the PAM session on | |
937 | * termination */ | |
2d7c6aa2 | 938 | barrier_set_role(&barrier, BARRIER_CHILD); |
5b6319dc LP |
939 | |
940 | /* This string must fit in 10 chars (i.e. the length | |
5d6b1584 LP |
941 | * of "/sbin/init"), to look pretty in /bin/ps */ |
942 | rename_process("(sd-pam)"); | |
5b6319dc LP |
943 | |
944 | /* Make sure we don't keep open the passed fds in this | |
945 | child. We assume that otherwise only those fds are | |
946 | open here that have been opened by PAM. */ | |
947 | close_many(fds, n_fds); | |
948 | ||
940c5210 AK |
949 | /* Drop privileges - we don't need any to pam_close_session |
950 | * and this will make PR_SET_PDEATHSIG work in most cases. | |
951 | * If this fails, ignore the error - but expect sd-pam threads | |
952 | * to fail to exit normally */ | |
2d6fce8d | 953 | |
97f0e76f LP |
954 | r = maybe_setgroups(0, NULL); |
955 | if (r < 0) | |
956 | log_warning_errno(r, "Failed to setgroups() in sd-pam: %m"); | |
2d6fce8d LP |
957 | if (setresgid(gid, gid, gid) < 0) |
958 | log_warning_errno(errno, "Failed to setresgid() in sd-pam: %m"); | |
940c5210 | 959 | if (setresuid(uid, uid, uid) < 0) |
2d6fce8d | 960 | log_warning_errno(errno, "Failed to setresuid() in sd-pam: %m"); |
940c5210 | 961 | |
ce30c8dc LP |
962 | (void) ignore_signals(SIGPIPE, -1); |
963 | ||
940c5210 AK |
964 | /* Wait until our parent died. This will only work if |
965 | * the above setresuid() succeeds, otherwise the kernel | |
966 | * will not allow unprivileged parents kill their privileged | |
967 | * children this way. We rely on the control groups kill logic | |
5b6319dc LP |
968 | * to do the rest for us. */ |
969 | if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) | |
970 | goto child_finish; | |
971 | ||
2d7c6aa2 DH |
972 | /* Tell the parent that our setup is done. This is especially |
973 | * important regarding dropping privileges. Otherwise, unit | |
974 | * setup might race against our setresuid(2) call. */ | |
975 | barrier_place(&barrier); | |
976 | ||
5b6319dc LP |
977 | /* Check if our parent process might already have |
978 | * died? */ | |
979 | if (getppid() == parent_pid) { | |
d6e5f3ad DM |
980 | sigset_t ss; |
981 | ||
982 | assert_se(sigemptyset(&ss) >= 0); | |
983 | assert_se(sigaddset(&ss, SIGTERM) >= 0); | |
984 | ||
3dead8d9 LP |
985 | for (;;) { |
986 | if (sigwait(&ss, &sig) < 0) { | |
987 | if (errno == EINTR) | |
988 | continue; | |
989 | ||
990 | goto child_finish; | |
991 | } | |
5b6319dc | 992 | |
3dead8d9 LP |
993 | assert(sig == SIGTERM); |
994 | break; | |
995 | } | |
5b6319dc LP |
996 | } |
997 | ||
3dead8d9 | 998 | /* If our parent died we'll end the session */ |
f546241b | 999 | if (getppid() != parent_pid) { |
970edce6 | 1000 | pam_code = pam_close_session(handle, flags); |
f546241b | 1001 | if (pam_code != PAM_SUCCESS) |
5b6319dc | 1002 | goto child_finish; |
f546241b | 1003 | } |
5b6319dc | 1004 | |
7bb70b6e | 1005 | ret = 0; |
5b6319dc LP |
1006 | |
1007 | child_finish: | |
970edce6 | 1008 | pam_end(handle, pam_code | flags); |
7bb70b6e | 1009 | _exit(ret); |
5b6319dc LP |
1010 | } |
1011 | ||
2d7c6aa2 DH |
1012 | barrier_set_role(&barrier, BARRIER_PARENT); |
1013 | ||
5b6319dc LP |
1014 | /* If the child was forked off successfully it will do all the |
1015 | * cleanups, so forget about the handle here. */ | |
1016 | handle = NULL; | |
1017 | ||
3b8bddde | 1018 | /* Unblock SIGTERM again in the parent */ |
72c0a2c2 | 1019 | assert_se(sigprocmask(SIG_SETMASK, &old_ss, NULL) >= 0); |
5b6319dc LP |
1020 | |
1021 | /* We close the log explicitly here, since the PAM modules | |
1022 | * might have opened it, but we don't want this fd around. */ | |
1023 | closelog(); | |
1024 | ||
2d7c6aa2 DH |
1025 | /* Synchronously wait for the child to initialize. We don't care for |
1026 | * errors as we cannot recover. However, warn loudly if it happens. */ | |
1027 | if (!barrier_place_and_sync(&barrier)) | |
1028 | log_error("PAM initialization failed"); | |
1029 | ||
2065ca69 JW |
1030 | strv_free(*env); |
1031 | *env = e; | |
aa87e624 | 1032 | |
5b6319dc LP |
1033 | return 0; |
1034 | ||
1035 | fail: | |
970edce6 ZJS |
1036 | if (pam_code != PAM_SUCCESS) { |
1037 | log_error("PAM failed: %s", pam_strerror(handle, pam_code)); | |
7bb70b6e LP |
1038 | r = -EPERM; /* PAM errors do not map to errno */ |
1039 | } else | |
1040 | log_error_errno(r, "PAM failed: %m"); | |
9ba35398 | 1041 | |
5b6319dc LP |
1042 | if (handle) { |
1043 | if (close_session) | |
970edce6 | 1044 | pam_code = pam_close_session(handle, flags); |
5b6319dc | 1045 | |
970edce6 | 1046 | pam_end(handle, pam_code | flags); |
5b6319dc LP |
1047 | } |
1048 | ||
1049 | strv_free(e); | |
5b6319dc LP |
1050 | closelog(); |
1051 | ||
7bb70b6e | 1052 | return r; |
cefc33ae LP |
1053 | #else |
1054 | return 0; | |
5b6319dc | 1055 | #endif |
cefc33ae | 1056 | } |
5b6319dc | 1057 | |
5d6b1584 LP |
1058 | static void rename_process_from_path(const char *path) { |
1059 | char process_name[11]; | |
1060 | const char *p; | |
1061 | size_t l; | |
1062 | ||
1063 | /* This resulting string must fit in 10 chars (i.e. the length | |
1064 | * of "/sbin/init") to look pretty in /bin/ps */ | |
1065 | ||
2b6bf07d | 1066 | p = basename(path); |
5d6b1584 LP |
1067 | if (isempty(p)) { |
1068 | rename_process("(...)"); | |
1069 | return; | |
1070 | } | |
1071 | ||
1072 | l = strlen(p); | |
1073 | if (l > 8) { | |
1074 | /* The end of the process name is usually more | |
1075 | * interesting, since the first bit might just be | |
1076 | * "systemd-" */ | |
1077 | p = p + l - 8; | |
1078 | l = 8; | |
1079 | } | |
1080 | ||
1081 | process_name[0] = '('; | |
1082 | memcpy(process_name+1, p, l); | |
1083 | process_name[1+l] = ')'; | |
1084 | process_name[1+l+1] = 0; | |
1085 | ||
1086 | rename_process(process_name); | |
1087 | } | |
1088 | ||
c0467cf3 | 1089 | #ifdef HAVE_SECCOMP |
17df7223 | 1090 | |
83f12b27 FS |
1091 | static bool skip_seccomp_unavailable(const Unit* u, const char* msg) { |
1092 | if (!is_seccomp_available()) { | |
1093 | log_open(); | |
d347d902 | 1094 | log_unit_debug(u, "SECCOMP features not detected in the kernel, skipping %s", msg); |
83f12b27 FS |
1095 | log_close(); |
1096 | return true; | |
1097 | } | |
1098 | return false; | |
1099 | } | |
1100 | ||
1101 | static int apply_seccomp(const Unit* u, const ExecContext *c) { | |
17df7223 LP |
1102 | uint32_t negative_action, action; |
1103 | scmp_filter_ctx *seccomp; | |
c0467cf3 RC |
1104 | Iterator i; |
1105 | void *id; | |
17df7223 | 1106 | int r; |
8351ceae | 1107 | |
c0467cf3 | 1108 | assert(c); |
8351ceae | 1109 | |
83f12b27 FS |
1110 | if (skip_seccomp_unavailable(u, "syscall filtering")) |
1111 | return 0; | |
1112 | ||
17df7223 LP |
1113 | negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno); |
1114 | ||
1115 | seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW); | |
1116 | if (!seccomp) | |
1117 | return -ENOMEM; | |
8351ceae | 1118 | |
e9642be2 LP |
1119 | if (c->syscall_archs) { |
1120 | ||
1121 | SET_FOREACH(id, c->syscall_archs, i) { | |
1122 | r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1); | |
1123 | if (r == -EEXIST) | |
1124 | continue; | |
7c66bae2 LP |
1125 | if (r < 0) |
1126 | goto finish; | |
e9642be2 | 1127 | } |
e9642be2 | 1128 | |
7c66bae2 | 1129 | } else { |
e9642be2 | 1130 | r = seccomp_add_secondary_archs(seccomp); |
7c66bae2 LP |
1131 | if (r < 0) |
1132 | goto finish; | |
57183d11 | 1133 | } |
8351ceae | 1134 | |
57183d11 | 1135 | action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action; |
17df7223 LP |
1136 | SET_FOREACH(id, c->syscall_filter, i) { |
1137 | r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0); | |
7c66bae2 LP |
1138 | if (r < 0) |
1139 | goto finish; | |
c0467cf3 | 1140 | } |
8351ceae | 1141 | |
7c66bae2 LP |
1142 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); |
1143 | if (r < 0) | |
1144 | goto finish; | |
1145 | ||
17df7223 | 1146 | r = seccomp_load(seccomp); |
7c66bae2 LP |
1147 | |
1148 | finish: | |
17df7223 | 1149 | seccomp_release(seccomp); |
4298d0b5 LP |
1150 | return r; |
1151 | } | |
1152 | ||
83f12b27 | 1153 | static int apply_address_families(const Unit* u, const ExecContext *c) { |
4298d0b5 LP |
1154 | scmp_filter_ctx *seccomp; |
1155 | Iterator i; | |
1156 | int r; | |
1157 | ||
1158 | assert(c); | |
1159 | ||
83f12b27 FS |
1160 | if (skip_seccomp_unavailable(u, "RestrictAddressFamilies=")) |
1161 | return 0; | |
1162 | ||
4298d0b5 LP |
1163 | seccomp = seccomp_init(SCMP_ACT_ALLOW); |
1164 | if (!seccomp) | |
1165 | return -ENOMEM; | |
1166 | ||
1167 | r = seccomp_add_secondary_archs(seccomp); | |
1168 | if (r < 0) | |
1169 | goto finish; | |
1170 | ||
1171 | if (c->address_families_whitelist) { | |
1172 | int af, first = 0, last = 0; | |
1173 | void *afp; | |
1174 | ||
1175 | /* If this is a whitelist, we first block the address | |
1176 | * families that are out of range and then everything | |
1177 | * that is not in the set. First, we find the lowest | |
1178 | * and highest address family in the set. */ | |
1179 | ||
1180 | SET_FOREACH(afp, c->address_families, i) { | |
1181 | af = PTR_TO_INT(afp); | |
17df7223 | 1182 | |
4298d0b5 LP |
1183 | if (af <= 0 || af >= af_max()) |
1184 | continue; | |
1185 | ||
1186 | if (first == 0 || af < first) | |
1187 | first = af; | |
1188 | ||
1189 | if (last == 0 || af > last) | |
1190 | last = af; | |
1191 | } | |
1192 | ||
1193 | assert((first == 0) == (last == 0)); | |
1194 | ||
1195 | if (first == 0) { | |
1196 | ||
1197 | /* No entries in the valid range, block everything */ | |
1198 | r = seccomp_rule_add( | |
1199 | seccomp, | |
1200 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1201 | SCMP_SYS(socket), | |
1202 | 0); | |
1203 | if (r < 0) | |
1204 | goto finish; | |
1205 | ||
1206 | } else { | |
1207 | ||
1208 | /* Block everything below the first entry */ | |
1209 | r = seccomp_rule_add( | |
1210 | seccomp, | |
1211 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1212 | SCMP_SYS(socket), | |
1213 | 1, | |
1214 | SCMP_A0(SCMP_CMP_LT, first)); | |
1215 | if (r < 0) | |
1216 | goto finish; | |
1217 | ||
1218 | /* Block everything above the last entry */ | |
1219 | r = seccomp_rule_add( | |
1220 | seccomp, | |
1221 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1222 | SCMP_SYS(socket), | |
1223 | 1, | |
1224 | SCMP_A0(SCMP_CMP_GT, last)); | |
1225 | if (r < 0) | |
1226 | goto finish; | |
1227 | ||
1228 | /* Block everything between the first and last | |
1229 | * entry */ | |
1230 | for (af = 1; af < af_max(); af++) { | |
1231 | ||
1232 | if (set_contains(c->address_families, INT_TO_PTR(af))) | |
1233 | continue; | |
1234 | ||
1235 | r = seccomp_rule_add( | |
1236 | seccomp, | |
1237 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1238 | SCMP_SYS(socket), | |
1239 | 1, | |
1240 | SCMP_A0(SCMP_CMP_EQ, af)); | |
1241 | if (r < 0) | |
1242 | goto finish; | |
1243 | } | |
1244 | } | |
1245 | ||
1246 | } else { | |
1247 | void *af; | |
1248 | ||
1249 | /* If this is a blacklist, then generate one rule for | |
1250 | * each address family that are then combined in OR | |
1251 | * checks. */ | |
1252 | ||
1253 | SET_FOREACH(af, c->address_families, i) { | |
1254 | ||
1255 | r = seccomp_rule_add( | |
1256 | seccomp, | |
1257 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1258 | SCMP_SYS(socket), | |
1259 | 1, | |
1260 | SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af))); | |
1261 | if (r < 0) | |
1262 | goto finish; | |
1263 | } | |
1264 | } | |
1265 | ||
1266 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1267 | if (r < 0) | |
1268 | goto finish; | |
1269 | ||
1270 | r = seccomp_load(seccomp); | |
1271 | ||
1272 | finish: | |
1273 | seccomp_release(seccomp); | |
17df7223 | 1274 | return r; |
8351ceae | 1275 | } |
4298d0b5 | 1276 | |
83f12b27 | 1277 | static int apply_memory_deny_write_execute(const Unit* u, const ExecContext *c) { |
f3e43635 TM |
1278 | scmp_filter_ctx *seccomp; |
1279 | int r; | |
1280 | ||
1281 | assert(c); | |
1282 | ||
83f12b27 FS |
1283 | if (skip_seccomp_unavailable(u, "MemoryDenyWriteExecute=")) |
1284 | return 0; | |
1285 | ||
f3e43635 TM |
1286 | seccomp = seccomp_init(SCMP_ACT_ALLOW); |
1287 | if (!seccomp) | |
1288 | return -ENOMEM; | |
1289 | ||
72246c2a LP |
1290 | r = seccomp_add_secondary_archs(seccomp); |
1291 | if (r < 0) | |
1292 | goto finish; | |
1293 | ||
f3e43635 TM |
1294 | r = seccomp_rule_add( |
1295 | seccomp, | |
abd84d4d | 1296 | SCMP_ACT_ERRNO(EPERM), |
f3e43635 TM |
1297 | SCMP_SYS(mmap), |
1298 | 1, | |
1299 | SCMP_A2(SCMP_CMP_MASKED_EQ, PROT_EXEC|PROT_WRITE, PROT_EXEC|PROT_WRITE)); | |
1300 | if (r < 0) | |
1301 | goto finish; | |
1302 | ||
1303 | r = seccomp_rule_add( | |
1304 | seccomp, | |
abd84d4d | 1305 | SCMP_ACT_ERRNO(EPERM), |
f3e43635 TM |
1306 | SCMP_SYS(mprotect), |
1307 | 1, | |
1308 | SCMP_A2(SCMP_CMP_MASKED_EQ, PROT_EXEC, PROT_EXEC)); | |
1309 | if (r < 0) | |
1310 | goto finish; | |
1311 | ||
1312 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1313 | if (r < 0) | |
1314 | goto finish; | |
1315 | ||
1316 | r = seccomp_load(seccomp); | |
1317 | ||
1318 | finish: | |
1319 | seccomp_release(seccomp); | |
1320 | return r; | |
1321 | } | |
1322 | ||
83f12b27 | 1323 | static int apply_restrict_realtime(const Unit* u, const ExecContext *c) { |
f4170c67 LP |
1324 | static const int permitted_policies[] = { |
1325 | SCHED_OTHER, | |
1326 | SCHED_BATCH, | |
1327 | SCHED_IDLE, | |
1328 | }; | |
1329 | ||
1330 | scmp_filter_ctx *seccomp; | |
1331 | unsigned i; | |
1332 | int r, p, max_policy = 0; | |
1333 | ||
1334 | assert(c); | |
1335 | ||
83f12b27 FS |
1336 | if (skip_seccomp_unavailable(u, "RestrictRealtime=")) |
1337 | return 0; | |
1338 | ||
f4170c67 LP |
1339 | seccomp = seccomp_init(SCMP_ACT_ALLOW); |
1340 | if (!seccomp) | |
1341 | return -ENOMEM; | |
1342 | ||
72246c2a LP |
1343 | r = seccomp_add_secondary_archs(seccomp); |
1344 | if (r < 0) | |
1345 | goto finish; | |
1346 | ||
f4170c67 LP |
1347 | /* Determine the highest policy constant we want to allow */ |
1348 | for (i = 0; i < ELEMENTSOF(permitted_policies); i++) | |
1349 | if (permitted_policies[i] > max_policy) | |
1350 | max_policy = permitted_policies[i]; | |
1351 | ||
1352 | /* Go through all policies with lower values than that, and block them -- unless they appear in the | |
1353 | * whitelist. */ | |
1354 | for (p = 0; p < max_policy; p++) { | |
1355 | bool good = false; | |
1356 | ||
1357 | /* Check if this is in the whitelist. */ | |
1358 | for (i = 0; i < ELEMENTSOF(permitted_policies); i++) | |
1359 | if (permitted_policies[i] == p) { | |
1360 | good = true; | |
1361 | break; | |
1362 | } | |
1363 | ||
1364 | if (good) | |
1365 | continue; | |
1366 | ||
1367 | /* Deny this policy */ | |
1368 | r = seccomp_rule_add( | |
1369 | seccomp, | |
1370 | SCMP_ACT_ERRNO(EPERM), | |
1371 | SCMP_SYS(sched_setscheduler), | |
1372 | 1, | |
1373 | SCMP_A1(SCMP_CMP_EQ, p)); | |
1374 | if (r < 0) | |
1375 | goto finish; | |
1376 | } | |
1377 | ||
1378 | /* Blacklist all other policies, i.e. the ones with higher values. Note that all comparisons are unsigned here, | |
1379 | * hence no need no check for < 0 values. */ | |
1380 | r = seccomp_rule_add( | |
1381 | seccomp, | |
1382 | SCMP_ACT_ERRNO(EPERM), | |
1383 | SCMP_SYS(sched_setscheduler), | |
1384 | 1, | |
1385 | SCMP_A1(SCMP_CMP_GT, max_policy)); | |
1386 | if (r < 0) | |
1387 | goto finish; | |
1388 | ||
1389 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1390 | if (r < 0) | |
1391 | goto finish; | |
1392 | ||
1393 | r = seccomp_load(seccomp); | |
1394 | ||
1395 | finish: | |
1396 | seccomp_release(seccomp); | |
1397 | return r; | |
1398 | } | |
1399 | ||
59eeb84b LP |
1400 | static int apply_protect_sysctl(Unit *u, const ExecContext *c) { |
1401 | scmp_filter_ctx *seccomp; | |
1402 | int r; | |
1403 | ||
1404 | assert(c); | |
1405 | ||
1406 | /* Turn off the legacy sysctl() system call. Many distributions turn this off while building the kernel, but | |
1407 | * let's protect even those systems where this is left on in the kernel. */ | |
1408 | ||
1409 | if (skip_seccomp_unavailable(u, "ProtectKernelTunables=")) | |
1410 | return 0; | |
1411 | ||
1412 | seccomp = seccomp_init(SCMP_ACT_ALLOW); | |
1413 | if (!seccomp) | |
1414 | return -ENOMEM; | |
1415 | ||
1416 | r = seccomp_add_secondary_archs(seccomp); | |
1417 | if (r < 0) | |
1418 | goto finish; | |
1419 | ||
1420 | r = seccomp_rule_add( | |
1421 | seccomp, | |
1422 | SCMP_ACT_ERRNO(EPERM), | |
1423 | SCMP_SYS(_sysctl), | |
1424 | 0); | |
1425 | if (r < 0) | |
1426 | goto finish; | |
1427 | ||
1428 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1429 | if (r < 0) | |
1430 | goto finish; | |
1431 | ||
1432 | r = seccomp_load(seccomp); | |
1433 | ||
1434 | finish: | |
1435 | seccomp_release(seccomp); | |
1436 | return r; | |
1437 | } | |
1438 | ||
502d704e DH |
1439 | static int apply_protect_kernel_modules(Unit *u, const ExecContext *c) { |
1440 | static const int module_syscalls[] = { | |
1441 | SCMP_SYS(delete_module), | |
1442 | SCMP_SYS(finit_module), | |
1443 | SCMP_SYS(init_module), | |
1444 | }; | |
1445 | ||
1446 | scmp_filter_ctx *seccomp; | |
1447 | unsigned i; | |
1448 | int r; | |
1449 | ||
1450 | assert(c); | |
1451 | ||
1452 | /* Turn of module syscalls on ProtectKernelModules=yes */ | |
1453 | ||
1454 | if (skip_seccomp_unavailable(u, "ProtectKernelModules=")) | |
1455 | return 0; | |
1456 | ||
1457 | seccomp = seccomp_init(SCMP_ACT_ALLOW); | |
1458 | if (!seccomp) | |
1459 | return -ENOMEM; | |
1460 | ||
1461 | r = seccomp_add_secondary_archs(seccomp); | |
1462 | if (r < 0) | |
1463 | goto finish; | |
1464 | ||
1465 | for (i = 0; i < ELEMENTSOF(module_syscalls); i++) { | |
1466 | r = seccomp_rule_add(seccomp, SCMP_ACT_ERRNO(EPERM), | |
1467 | module_syscalls[i], 0); | |
1468 | if (r < 0) | |
1469 | goto finish; | |
1470 | } | |
1471 | ||
1472 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1473 | if (r < 0) | |
1474 | goto finish; | |
1475 | ||
1476 | r = seccomp_load(seccomp); | |
1477 | ||
1478 | finish: | |
1479 | seccomp_release(seccomp); | |
1480 | return r; | |
1481 | } | |
1482 | ||
ba128bb8 | 1483 | static int apply_private_devices(Unit *u, const ExecContext *c) { |
8f81a5f6 | 1484 | const SystemCallFilterSet *set; |
ba128bb8 | 1485 | scmp_filter_ctx *seccomp; |
8f81a5f6 DH |
1486 | const char *sys; |
1487 | bool syscalls_found = false; | |
ba128bb8 LP |
1488 | int r; |
1489 | ||
1490 | assert(c); | |
1491 | ||
8f81a5f6 | 1492 | /* If PrivateDevices= is set, also turn off iopl and all @raw-io syscalls. */ |
ba128bb8 LP |
1493 | |
1494 | if (skip_seccomp_unavailable(u, "PrivateDevices=")) | |
1495 | return 0; | |
1496 | ||
1497 | seccomp = seccomp_init(SCMP_ACT_ALLOW); | |
1498 | if (!seccomp) | |
1499 | return -ENOMEM; | |
1500 | ||
1501 | r = seccomp_add_secondary_archs(seccomp); | |
1502 | if (r < 0) | |
1503 | goto finish; | |
1504 | ||
8f81a5f6 DH |
1505 | for (set = syscall_filter_sets; set->set_name; set++) |
1506 | if (streq(set->set_name, "@raw-io")) { | |
1507 | syscalls_found = true; | |
1508 | break; | |
1509 | } | |
1510 | ||
1511 | /* We should never fail here */ | |
1512 | if (!syscalls_found) { | |
1513 | r = -EOPNOTSUPP; | |
1514 | goto finish; | |
1515 | } | |
1516 | ||
1517 | NULSTR_FOREACH(sys, set->value) { | |
1518 | int id; | |
1519 | bool add = true; | |
1520 | ||
1521 | #ifndef __NR_s390_pci_mmio_read | |
1522 | if (streq(sys, "s390_pci_mmio_read")) | |
1523 | add = false; | |
1524 | #endif | |
1525 | #ifndef __NR_s390_pci_mmio_write | |
1526 | if (streq(sys, "s390_pci_mmio_write")) | |
1527 | add = false; | |
1528 | #endif | |
1529 | ||
1530 | if (!add) | |
1531 | continue; | |
1532 | ||
1533 | id = seccomp_syscall_resolve_name(sys); | |
1534 | ||
ba128bb8 LP |
1535 | r = seccomp_rule_add( |
1536 | seccomp, | |
1537 | SCMP_ACT_ERRNO(EPERM), | |
8f81a5f6 | 1538 | id, 0); |
ba128bb8 LP |
1539 | if (r < 0) |
1540 | goto finish; | |
1541 | } | |
1542 | ||
1543 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1544 | if (r < 0) | |
1545 | goto finish; | |
1546 | ||
1547 | r = seccomp_load(seccomp); | |
1548 | ||
1549 | finish: | |
1550 | seccomp_release(seccomp); | |
1551 | return r; | |
1552 | } | |
1553 | ||
c0467cf3 | 1554 | #endif |
8351ceae | 1555 | |
31a7eb86 ZJS |
1556 | static void do_idle_pipe_dance(int idle_pipe[4]) { |
1557 | assert(idle_pipe); | |
1558 | ||
54eb2300 LP |
1559 | idle_pipe[1] = safe_close(idle_pipe[1]); |
1560 | idle_pipe[2] = safe_close(idle_pipe[2]); | |
31a7eb86 ZJS |
1561 | |
1562 | if (idle_pipe[0] >= 0) { | |
1563 | int r; | |
1564 | ||
1565 | r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC); | |
1566 | ||
1567 | if (idle_pipe[3] >= 0 && r == 0 /* timeout */) { | |
c7cc737f LP |
1568 | ssize_t n; |
1569 | ||
31a7eb86 | 1570 | /* Signal systemd that we are bored and want to continue. */ |
c7cc737f LP |
1571 | n = write(idle_pipe[3], "x", 1); |
1572 | if (n > 0) | |
cd972d69 ZJS |
1573 | /* Wait for systemd to react to the signal above. */ |
1574 | fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC); | |
31a7eb86 ZJS |
1575 | } |
1576 | ||
54eb2300 | 1577 | idle_pipe[0] = safe_close(idle_pipe[0]); |
31a7eb86 ZJS |
1578 | |
1579 | } | |
1580 | ||
54eb2300 | 1581 | idle_pipe[3] = safe_close(idle_pipe[3]); |
31a7eb86 ZJS |
1582 | } |
1583 | ||
7cae38c4 | 1584 | static int build_environment( |
fd63e712 | 1585 | Unit *u, |
9fa95f85 | 1586 | const ExecContext *c, |
1e22b5cd | 1587 | const ExecParameters *p, |
7cae38c4 LP |
1588 | unsigned n_fds, |
1589 | const char *home, | |
1590 | const char *username, | |
1591 | const char *shell, | |
7bce046b LP |
1592 | dev_t journal_stream_dev, |
1593 | ino_t journal_stream_ino, | |
7cae38c4 LP |
1594 | char ***ret) { |
1595 | ||
1596 | _cleanup_strv_free_ char **our_env = NULL; | |
1597 | unsigned n_env = 0; | |
1598 | char *x; | |
1599 | ||
4b58153d | 1600 | assert(u); |
7cae38c4 LP |
1601 | assert(c); |
1602 | assert(ret); | |
1603 | ||
4b58153d | 1604 | our_env = new0(char*, 14); |
7cae38c4 LP |
1605 | if (!our_env) |
1606 | return -ENOMEM; | |
1607 | ||
1608 | if (n_fds > 0) { | |
8dd4c05b LP |
1609 | _cleanup_free_ char *joined = NULL; |
1610 | ||
ccd06097 | 1611 | if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0) |
7cae38c4 LP |
1612 | return -ENOMEM; |
1613 | our_env[n_env++] = x; | |
1614 | ||
1615 | if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0) | |
1616 | return -ENOMEM; | |
1617 | our_env[n_env++] = x; | |
8dd4c05b | 1618 | |
1e22b5cd | 1619 | joined = strv_join(p->fd_names, ":"); |
8dd4c05b LP |
1620 | if (!joined) |
1621 | return -ENOMEM; | |
1622 | ||
1623 | x = strjoin("LISTEN_FDNAMES=", joined, NULL); | |
1624 | if (!x) | |
1625 | return -ENOMEM; | |
1626 | our_env[n_env++] = x; | |
7cae38c4 LP |
1627 | } |
1628 | ||
b08af3b1 | 1629 | if ((p->flags & EXEC_SET_WATCHDOG) && p->watchdog_usec > 0) { |
ccd06097 | 1630 | if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0) |
09812eb7 LP |
1631 | return -ENOMEM; |
1632 | our_env[n_env++] = x; | |
1633 | ||
1e22b5cd | 1634 | if (asprintf(&x, "WATCHDOG_USEC="USEC_FMT, p->watchdog_usec) < 0) |
09812eb7 LP |
1635 | return -ENOMEM; |
1636 | our_env[n_env++] = x; | |
1637 | } | |
1638 | ||
fd63e712 LP |
1639 | /* If this is D-Bus, tell the nss-systemd module, since it relies on being able to use D-Bus look up dynamic |
1640 | * users via PID 1, possibly dead-locking the dbus daemon. This way it will not use D-Bus to resolve names, but | |
1641 | * check the database directly. */ | |
1642 | if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) { | |
1643 | x = strdup("SYSTEMD_NSS_BYPASS_BUS=1"); | |
1644 | if (!x) | |
1645 | return -ENOMEM; | |
1646 | our_env[n_env++] = x; | |
1647 | } | |
1648 | ||
7cae38c4 LP |
1649 | if (home) { |
1650 | x = strappend("HOME=", home); | |
1651 | if (!x) | |
1652 | return -ENOMEM; | |
1653 | our_env[n_env++] = x; | |
1654 | } | |
1655 | ||
1656 | if (username) { | |
1657 | x = strappend("LOGNAME=", username); | |
1658 | if (!x) | |
1659 | return -ENOMEM; | |
1660 | our_env[n_env++] = x; | |
1661 | ||
1662 | x = strappend("USER=", username); | |
1663 | if (!x) | |
1664 | return -ENOMEM; | |
1665 | our_env[n_env++] = x; | |
1666 | } | |
1667 | ||
1668 | if (shell) { | |
1669 | x = strappend("SHELL=", shell); | |
1670 | if (!x) | |
1671 | return -ENOMEM; | |
1672 | our_env[n_env++] = x; | |
1673 | } | |
1674 | ||
4b58153d LP |
1675 | if (!sd_id128_is_null(u->invocation_id)) { |
1676 | if (asprintf(&x, "INVOCATION_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(u->invocation_id)) < 0) | |
1677 | return -ENOMEM; | |
1678 | ||
1679 | our_env[n_env++] = x; | |
1680 | } | |
1681 | ||
6af760f3 LP |
1682 | if (exec_context_needs_term(c)) { |
1683 | const char *tty_path, *term = NULL; | |
1684 | ||
1685 | tty_path = exec_context_tty_path(c); | |
1686 | ||
1687 | /* If we are forked off PID 1 and we are supposed to operate on /dev/console, then let's try to inherit | |
1688 | * the $TERM set for PID 1. This is useful for containers so that the $TERM the container manager | |
1689 | * passes to PID 1 ends up all the way in the console login shown. */ | |
1690 | ||
1691 | if (path_equal(tty_path, "/dev/console") && getppid() == 1) | |
1692 | term = getenv("TERM"); | |
1693 | if (!term) | |
1694 | term = default_term_for_tty(tty_path); | |
7cae38c4 | 1695 | |
6af760f3 | 1696 | x = strappend("TERM=", term); |
7cae38c4 LP |
1697 | if (!x) |
1698 | return -ENOMEM; | |
1699 | our_env[n_env++] = x; | |
1700 | } | |
1701 | ||
7bce046b LP |
1702 | if (journal_stream_dev != 0 && journal_stream_ino != 0) { |
1703 | if (asprintf(&x, "JOURNAL_STREAM=" DEV_FMT ":" INO_FMT, journal_stream_dev, journal_stream_ino) < 0) | |
1704 | return -ENOMEM; | |
1705 | ||
1706 | our_env[n_env++] = x; | |
1707 | } | |
1708 | ||
7cae38c4 | 1709 | our_env[n_env++] = NULL; |
7bce046b | 1710 | assert(n_env <= 12); |
7cae38c4 LP |
1711 | |
1712 | *ret = our_env; | |
1713 | our_env = NULL; | |
1714 | ||
1715 | return 0; | |
1716 | } | |
1717 | ||
b4c14404 FB |
1718 | static int build_pass_environment(const ExecContext *c, char ***ret) { |
1719 | _cleanup_strv_free_ char **pass_env = NULL; | |
1720 | size_t n_env = 0, n_bufsize = 0; | |
1721 | char **i; | |
1722 | ||
1723 | STRV_FOREACH(i, c->pass_environment) { | |
1724 | _cleanup_free_ char *x = NULL; | |
1725 | char *v; | |
1726 | ||
1727 | v = getenv(*i); | |
1728 | if (!v) | |
1729 | continue; | |
1730 | x = strjoin(*i, "=", v, NULL); | |
1731 | if (!x) | |
1732 | return -ENOMEM; | |
1733 | if (!GREEDY_REALLOC(pass_env, n_bufsize, n_env + 2)) | |
1734 | return -ENOMEM; | |
1735 | pass_env[n_env++] = x; | |
1736 | pass_env[n_env] = NULL; | |
1737 | x = NULL; | |
1738 | } | |
1739 | ||
1740 | *ret = pass_env; | |
1741 | pass_env = NULL; | |
1742 | ||
1743 | return 0; | |
1744 | } | |
1745 | ||
8b44a3d2 LP |
1746 | static bool exec_needs_mount_namespace( |
1747 | const ExecContext *context, | |
1748 | const ExecParameters *params, | |
1749 | ExecRuntime *runtime) { | |
1750 | ||
1751 | assert(context); | |
1752 | assert(params); | |
1753 | ||
2a624c36 AP |
1754 | if (!strv_isempty(context->read_write_paths) || |
1755 | !strv_isempty(context->read_only_paths) || | |
1756 | !strv_isempty(context->inaccessible_paths)) | |
8b44a3d2 LP |
1757 | return true; |
1758 | ||
1759 | if (context->mount_flags != 0) | |
1760 | return true; | |
1761 | ||
1762 | if (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) | |
1763 | return true; | |
1764 | ||
8b44a3d2 LP |
1765 | if (context->private_devices || |
1766 | context->protect_system != PROTECT_SYSTEM_NO || | |
59eeb84b LP |
1767 | context->protect_home != PROTECT_HOME_NO || |
1768 | context->protect_kernel_tunables || | |
c575770b | 1769 | context->protect_kernel_modules || |
59eeb84b | 1770 | context->protect_control_groups) |
8b44a3d2 LP |
1771 | return true; |
1772 | ||
1773 | return false; | |
1774 | } | |
1775 | ||
d251207d LP |
1776 | static int setup_private_users(uid_t uid, gid_t gid) { |
1777 | _cleanup_free_ char *uid_map = NULL, *gid_map = NULL; | |
1778 | _cleanup_close_pair_ int errno_pipe[2] = { -1, -1 }; | |
1779 | _cleanup_close_ int unshare_ready_fd = -1; | |
1780 | _cleanup_(sigkill_waitp) pid_t pid = 0; | |
1781 | uint64_t c = 1; | |
1782 | siginfo_t si; | |
1783 | ssize_t n; | |
1784 | int r; | |
1785 | ||
1786 | /* Set up a user namespace and map root to root, the selected UID/GID to itself, and everything else to | |
1787 | * nobody. In order to be able to write this mapping we need CAP_SETUID in the original user namespace, which | |
1788 | * we however lack after opening the user namespace. To work around this we fork() a temporary child process, | |
1789 | * which waits for the parent to create the new user namespace while staying in the original namespace. The | |
1790 | * child then writes the UID mapping, under full privileges. The parent waits for the child to finish and | |
1791 | * continues execution normally. */ | |
1792 | ||
1793 | if (uid != 0 && uid_is_valid(uid)) | |
1794 | asprintf(&uid_map, | |
1795 | "0 0 1\n" /* Map root → root */ | |
1796 | UID_FMT " " UID_FMT " 1\n", /* Map $UID → $UID */ | |
1797 | uid, uid); /* The case where the above is the same */ | |
1798 | else | |
1799 | uid_map = strdup("0 0 1\n"); | |
1800 | if (!uid_map) | |
1801 | return -ENOMEM; | |
1802 | ||
1803 | if (gid != 0 && gid_is_valid(gid)) | |
1804 | asprintf(&gid_map, | |
1805 | "0 0 1\n" /* Map root → root */ | |
1806 | GID_FMT " " GID_FMT " 1\n", /* Map $GID → $GID */ | |
1807 | gid, gid); | |
1808 | else | |
1809 | gid_map = strdup("0 0 1\n"); /* The case where the above is the same */ | |
1810 | if (!gid_map) | |
1811 | return -ENOMEM; | |
1812 | ||
1813 | /* Create a communication channel so that the parent can tell the child when it finished creating the user | |
1814 | * namespace. */ | |
1815 | unshare_ready_fd = eventfd(0, EFD_CLOEXEC); | |
1816 | if (unshare_ready_fd < 0) | |
1817 | return -errno; | |
1818 | ||
1819 | /* Create a communication channel so that the child can tell the parent a proper error code in case it | |
1820 | * failed. */ | |
1821 | if (pipe2(errno_pipe, O_CLOEXEC) < 0) | |
1822 | return -errno; | |
1823 | ||
1824 | pid = fork(); | |
1825 | if (pid < 0) | |
1826 | return -errno; | |
1827 | ||
1828 | if (pid == 0) { | |
1829 | _cleanup_close_ int fd = -1; | |
1830 | const char *a; | |
1831 | pid_t ppid; | |
1832 | ||
1833 | /* Child process, running in the original user namespace. Let's update the parent's UID/GID map from | |
1834 | * here, after the parent opened its own user namespace. */ | |
1835 | ||
1836 | ppid = getppid(); | |
1837 | errno_pipe[0] = safe_close(errno_pipe[0]); | |
1838 | ||
1839 | /* Wait until the parent unshared the user namespace */ | |
1840 | if (read(unshare_ready_fd, &c, sizeof(c)) < 0) { | |
1841 | r = -errno; | |
1842 | goto child_fail; | |
1843 | } | |
1844 | ||
1845 | /* Disable the setgroups() system call in the child user namespace, for good. */ | |
1846 | a = procfs_file_alloca(ppid, "setgroups"); | |
1847 | fd = open(a, O_WRONLY|O_CLOEXEC); | |
1848 | if (fd < 0) { | |
1849 | if (errno != ENOENT) { | |
1850 | r = -errno; | |
1851 | goto child_fail; | |
1852 | } | |
1853 | ||
1854 | /* If the file is missing the kernel is too old, let's continue anyway. */ | |
1855 | } else { | |
1856 | if (write(fd, "deny\n", 5) < 0) { | |
1857 | r = -errno; | |
1858 | goto child_fail; | |
1859 | } | |
1860 | ||
1861 | fd = safe_close(fd); | |
1862 | } | |
1863 | ||
1864 | /* First write the GID map */ | |
1865 | a = procfs_file_alloca(ppid, "gid_map"); | |
1866 | fd = open(a, O_WRONLY|O_CLOEXEC); | |
1867 | if (fd < 0) { | |
1868 | r = -errno; | |
1869 | goto child_fail; | |
1870 | } | |
1871 | if (write(fd, gid_map, strlen(gid_map)) < 0) { | |
1872 | r = -errno; | |
1873 | goto child_fail; | |
1874 | } | |
1875 | fd = safe_close(fd); | |
1876 | ||
1877 | /* The write the UID map */ | |
1878 | a = procfs_file_alloca(ppid, "uid_map"); | |
1879 | fd = open(a, O_WRONLY|O_CLOEXEC); | |
1880 | if (fd < 0) { | |
1881 | r = -errno; | |
1882 | goto child_fail; | |
1883 | } | |
1884 | if (write(fd, uid_map, strlen(uid_map)) < 0) { | |
1885 | r = -errno; | |
1886 | goto child_fail; | |
1887 | } | |
1888 | ||
1889 | _exit(EXIT_SUCCESS); | |
1890 | ||
1891 | child_fail: | |
1892 | (void) write(errno_pipe[1], &r, sizeof(r)); | |
1893 | _exit(EXIT_FAILURE); | |
1894 | } | |
1895 | ||
1896 | errno_pipe[1] = safe_close(errno_pipe[1]); | |
1897 | ||
1898 | if (unshare(CLONE_NEWUSER) < 0) | |
1899 | return -errno; | |
1900 | ||
1901 | /* Let the child know that the namespace is ready now */ | |
1902 | if (write(unshare_ready_fd, &c, sizeof(c)) < 0) | |
1903 | return -errno; | |
1904 | ||
1905 | /* Try to read an error code from the child */ | |
1906 | n = read(errno_pipe[0], &r, sizeof(r)); | |
1907 | if (n < 0) | |
1908 | return -errno; | |
1909 | if (n == sizeof(r)) { /* an error code was sent to us */ | |
1910 | if (r < 0) | |
1911 | return r; | |
1912 | return -EIO; | |
1913 | } | |
1914 | if (n != 0) /* on success we should have read 0 bytes */ | |
1915 | return -EIO; | |
1916 | ||
1917 | r = wait_for_terminate(pid, &si); | |
1918 | if (r < 0) | |
1919 | return r; | |
1920 | pid = 0; | |
1921 | ||
1922 | /* If something strange happened with the child, let's consider this fatal, too */ | |
1923 | if (si.si_code != CLD_EXITED || si.si_status != 0) | |
1924 | return -EIO; | |
1925 | ||
1926 | return 0; | |
1927 | } | |
1928 | ||
07689d5d LP |
1929 | static int setup_runtime_directory( |
1930 | const ExecContext *context, | |
1931 | const ExecParameters *params, | |
1932 | uid_t uid, | |
1933 | gid_t gid) { | |
1934 | ||
1935 | char **rt; | |
1936 | int r; | |
1937 | ||
1938 | assert(context); | |
1939 | assert(params); | |
1940 | ||
1941 | STRV_FOREACH(rt, context->runtime_directory) { | |
1942 | _cleanup_free_ char *p; | |
1943 | ||
1944 | p = strjoin(params->runtime_prefix, "/", *rt, NULL); | |
1945 | if (!p) | |
1946 | return -ENOMEM; | |
1947 | ||
1948 | r = mkdir_p_label(p, context->runtime_directory_mode); | |
1949 | if (r < 0) | |
1950 | return r; | |
1951 | ||
1952 | r = chmod_and_chown(p, context->runtime_directory_mode, uid, gid); | |
1953 | if (r < 0) | |
1954 | return r; | |
1955 | } | |
1956 | ||
1957 | return 0; | |
1958 | } | |
1959 | ||
cefc33ae LP |
1960 | static int setup_smack( |
1961 | const ExecContext *context, | |
1962 | const ExecCommand *command) { | |
1963 | ||
1964 | #ifdef HAVE_SMACK | |
1965 | int r; | |
1966 | ||
1967 | assert(context); | |
1968 | assert(command); | |
1969 | ||
1970 | if (!mac_smack_use()) | |
1971 | return 0; | |
1972 | ||
1973 | if (context->smack_process_label) { | |
1974 | r = mac_smack_apply_pid(0, context->smack_process_label); | |
1975 | if (r < 0) | |
1976 | return r; | |
1977 | } | |
1978 | #ifdef SMACK_DEFAULT_PROCESS_LABEL | |
1979 | else { | |
1980 | _cleanup_free_ char *exec_label = NULL; | |
1981 | ||
1982 | r = mac_smack_read(command->path, SMACK_ATTR_EXEC, &exec_label); | |
1983 | if (r < 0 && r != -ENODATA && r != -EOPNOTSUPP) | |
1984 | return r; | |
1985 | ||
1986 | r = mac_smack_apply_pid(0, exec_label ? : SMACK_DEFAULT_PROCESS_LABEL); | |
1987 | if (r < 0) | |
1988 | return r; | |
1989 | } | |
1990 | #endif | |
1991 | #endif | |
1992 | ||
1993 | return 0; | |
1994 | } | |
1995 | ||
3fbe8dbe LP |
1996 | static int compile_read_write_paths( |
1997 | const ExecContext *context, | |
1998 | const ExecParameters *params, | |
1999 | char ***ret) { | |
2000 | ||
2001 | _cleanup_strv_free_ char **l = NULL; | |
2002 | char **rt; | |
2003 | ||
2004 | /* Compile the list of writable paths. This is the combination of the explicitly configured paths, plus all | |
2005 | * runtime directories. */ | |
2006 | ||
2007 | if (strv_isempty(context->read_write_paths) && | |
2008 | strv_isempty(context->runtime_directory)) { | |
2009 | *ret = NULL; /* NOP if neither is set */ | |
2010 | return 0; | |
2011 | } | |
2012 | ||
2013 | l = strv_copy(context->read_write_paths); | |
2014 | if (!l) | |
2015 | return -ENOMEM; | |
2016 | ||
2017 | STRV_FOREACH(rt, context->runtime_directory) { | |
2018 | char *s; | |
2019 | ||
2020 | s = strjoin(params->runtime_prefix, "/", *rt, NULL); | |
2021 | if (!s) | |
2022 | return -ENOMEM; | |
2023 | ||
2024 | if (strv_consume(&l, s) < 0) | |
2025 | return -ENOMEM; | |
2026 | } | |
2027 | ||
2028 | *ret = l; | |
2029 | l = NULL; | |
2030 | ||
2031 | return 0; | |
2032 | } | |
2033 | ||
29206d46 LP |
2034 | static void append_socket_pair(int *array, unsigned *n, int pair[2]) { |
2035 | assert(array); | |
2036 | assert(n); | |
2037 | ||
2038 | if (!pair) | |
2039 | return; | |
2040 | ||
2041 | if (pair[0] >= 0) | |
2042 | array[(*n)++] = pair[0]; | |
2043 | if (pair[1] >= 0) | |
2044 | array[(*n)++] = pair[1]; | |
2045 | } | |
2046 | ||
a34ceba6 LP |
2047 | static int close_remaining_fds( |
2048 | const ExecParameters *params, | |
2049 | ExecRuntime *runtime, | |
29206d46 | 2050 | DynamicCreds *dcreds, |
00d9ef85 | 2051 | int user_lookup_fd, |
a34ceba6 LP |
2052 | int socket_fd, |
2053 | int *fds, unsigned n_fds) { | |
2054 | ||
2055 | unsigned n_dont_close = 0; | |
00d9ef85 | 2056 | int dont_close[n_fds + 12]; |
a34ceba6 LP |
2057 | |
2058 | assert(params); | |
2059 | ||
2060 | if (params->stdin_fd >= 0) | |
2061 | dont_close[n_dont_close++] = params->stdin_fd; | |
2062 | if (params->stdout_fd >= 0) | |
2063 | dont_close[n_dont_close++] = params->stdout_fd; | |
2064 | if (params->stderr_fd >= 0) | |
2065 | dont_close[n_dont_close++] = params->stderr_fd; | |
2066 | ||
2067 | if (socket_fd >= 0) | |
2068 | dont_close[n_dont_close++] = socket_fd; | |
2069 | if (n_fds > 0) { | |
2070 | memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds); | |
2071 | n_dont_close += n_fds; | |
2072 | } | |
2073 | ||
29206d46 LP |
2074 | if (runtime) |
2075 | append_socket_pair(dont_close, &n_dont_close, runtime->netns_storage_socket); | |
2076 | ||
2077 | if (dcreds) { | |
2078 | if (dcreds->user) | |
2079 | append_socket_pair(dont_close, &n_dont_close, dcreds->user->storage_socket); | |
2080 | if (dcreds->group) | |
2081 | append_socket_pair(dont_close, &n_dont_close, dcreds->group->storage_socket); | |
a34ceba6 LP |
2082 | } |
2083 | ||
00d9ef85 LP |
2084 | if (user_lookup_fd >= 0) |
2085 | dont_close[n_dont_close++] = user_lookup_fd; | |
2086 | ||
a34ceba6 LP |
2087 | return close_all_fds(dont_close, n_dont_close); |
2088 | } | |
2089 | ||
59eeb84b LP |
2090 | static bool context_has_address_families(const ExecContext *c) { |
2091 | assert(c); | |
2092 | ||
2093 | return c->address_families_whitelist || | |
2094 | !set_isempty(c->address_families); | |
2095 | } | |
2096 | ||
2097 | static bool context_has_syscall_filters(const ExecContext *c) { | |
2098 | assert(c); | |
2099 | ||
2100 | return c->syscall_whitelist || | |
2101 | !set_isempty(c->syscall_filter) || | |
2102 | !set_isempty(c->syscall_archs); | |
2103 | } | |
2104 | ||
2105 | static bool context_has_no_new_privileges(const ExecContext *c) { | |
2106 | assert(c); | |
2107 | ||
2108 | if (c->no_new_privileges) | |
2109 | return true; | |
2110 | ||
2111 | if (have_effective_cap(CAP_SYS_ADMIN)) /* if we are privileged, we don't need NNP */ | |
2112 | return false; | |
2113 | ||
2114 | return context_has_address_families(c) || /* we need NNP if we have any form of seccomp and are unprivileged */ | |
2115 | c->memory_deny_write_execute || | |
2116 | c->restrict_realtime || | |
2117 | c->protect_kernel_tunables || | |
4084e8fc DH |
2118 | c->protect_kernel_modules || |
2119 | c->private_devices || | |
59eeb84b LP |
2120 | context_has_syscall_filters(c); |
2121 | } | |
2122 | ||
00d9ef85 LP |
2123 | static int send_user_lookup( |
2124 | Unit *unit, | |
2125 | int user_lookup_fd, | |
2126 | uid_t uid, | |
2127 | gid_t gid) { | |
2128 | ||
2129 | assert(unit); | |
2130 | ||
2131 | /* Send the resolved UID/GID to PID 1 after we learnt it. We send a single datagram, containing the UID/GID | |
2132 | * data as well as the unit name. Note that we suppress sending this if no user/group to resolve was | |
2133 | * specified. */ | |
2134 | ||
2135 | if (user_lookup_fd < 0) | |
2136 | return 0; | |
2137 | ||
2138 | if (!uid_is_valid(uid) && !gid_is_valid(gid)) | |
2139 | return 0; | |
2140 | ||
2141 | if (writev(user_lookup_fd, | |
2142 | (struct iovec[]) { | |
2143 | { .iov_base = &uid, .iov_len = sizeof(uid) }, | |
2144 | { .iov_base = &gid, .iov_len = sizeof(gid) }, | |
2145 | { .iov_base = unit->id, .iov_len = strlen(unit->id) }}, 3) < 0) | |
2146 | return -errno; | |
2147 | ||
2148 | return 0; | |
2149 | } | |
2150 | ||
ff0af2a1 | 2151 | static int exec_child( |
f2341e0a | 2152 | Unit *unit, |
ff0af2a1 LP |
2153 | ExecCommand *command, |
2154 | const ExecContext *context, | |
2155 | const ExecParameters *params, | |
2156 | ExecRuntime *runtime, | |
29206d46 | 2157 | DynamicCreds *dcreds, |
ff0af2a1 LP |
2158 | char **argv, |
2159 | int socket_fd, | |
2160 | int *fds, unsigned n_fds, | |
2161 | char **files_env, | |
00d9ef85 | 2162 | int user_lookup_fd, |
ff0af2a1 | 2163 | int *exit_status) { |
d35fbf6b | 2164 | |
2065ca69 | 2165 | _cleanup_strv_free_ char **our_env = NULL, **pass_env = NULL, **accum_env = NULL, **final_argv = NULL; |
9008e1ac | 2166 | _cleanup_free_ char *mac_selinux_context_net = NULL; |
5f5d8eab | 2167 | const char *username = NULL, *home = NULL, *shell = NULL, *wd; |
7bce046b LP |
2168 | dev_t journal_stream_dev = 0; |
2169 | ino_t journal_stream_ino = 0; | |
2170 | bool needs_mount_namespace; | |
fed1e721 LP |
2171 | uid_t uid = UID_INVALID; |
2172 | gid_t gid = GID_INVALID; | |
ff0af2a1 | 2173 | int i, r; |
034c6ed7 | 2174 | |
f2341e0a | 2175 | assert(unit); |
5cb5a6ff LP |
2176 | assert(command); |
2177 | assert(context); | |
d35fbf6b | 2178 | assert(params); |
ff0af2a1 | 2179 | assert(exit_status); |
d35fbf6b DM |
2180 | |
2181 | rename_process_from_path(command->path); | |
2182 | ||
2183 | /* We reset exactly these signals, since they are the | |
2184 | * only ones we set to SIG_IGN in the main daemon. All | |
2185 | * others we leave untouched because we set them to | |
2186 | * SIG_DFL or a valid handler initially, both of which | |
2187 | * will be demoted to SIG_DFL. */ | |
ce30c8dc LP |
2188 | (void) default_signals(SIGNALS_CRASH_HANDLER, |
2189 | SIGNALS_IGNORE, -1); | |
d35fbf6b DM |
2190 | |
2191 | if (context->ignore_sigpipe) | |
ce30c8dc | 2192 | (void) ignore_signals(SIGPIPE, -1); |
d35fbf6b | 2193 | |
ff0af2a1 LP |
2194 | r = reset_signal_mask(); |
2195 | if (r < 0) { | |
2196 | *exit_status = EXIT_SIGNAL_MASK; | |
2197 | return r; | |
d35fbf6b | 2198 | } |
034c6ed7 | 2199 | |
d35fbf6b DM |
2200 | if (params->idle_pipe) |
2201 | do_idle_pipe_dance(params->idle_pipe); | |
4f2d528d | 2202 | |
d35fbf6b DM |
2203 | /* Close sockets very early to make sure we don't |
2204 | * block init reexecution because it cannot bind its | |
2205 | * sockets */ | |
ff0af2a1 | 2206 | |
d35fbf6b | 2207 | log_forget_fds(); |
4f2d528d | 2208 | |
00d9ef85 | 2209 | r = close_remaining_fds(params, runtime, dcreds, user_lookup_fd, socket_fd, fds, n_fds); |
ff0af2a1 LP |
2210 | if (r < 0) { |
2211 | *exit_status = EXIT_FDS; | |
2212 | return r; | |
8c7be95e LP |
2213 | } |
2214 | ||
d35fbf6b DM |
2215 | if (!context->same_pgrp) |
2216 | if (setsid() < 0) { | |
ff0af2a1 | 2217 | *exit_status = EXIT_SETSID; |
d35fbf6b DM |
2218 | return -errno; |
2219 | } | |
9e2f7c11 | 2220 | |
1e22b5cd | 2221 | exec_context_tty_reset(context, params); |
d35fbf6b | 2222 | |
c39f1ce2 | 2223 | if (params->flags & EXEC_CONFIRM_SPAWN) { |
d35fbf6b DM |
2224 | char response; |
2225 | ||
ff0af2a1 LP |
2226 | r = ask_for_confirmation(&response, argv); |
2227 | if (r == -ETIMEDOUT) | |
d35fbf6b | 2228 | write_confirm_message("Confirmation question timed out, assuming positive response.\n"); |
ff0af2a1 LP |
2229 | else if (r < 0) |
2230 | write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-r)); | |
d35fbf6b DM |
2231 | else if (response == 's') { |
2232 | write_confirm_message("Skipping execution.\n"); | |
ff0af2a1 | 2233 | *exit_status = EXIT_CONFIRM; |
d35fbf6b DM |
2234 | return -ECANCELED; |
2235 | } else if (response == 'n') { | |
2236 | write_confirm_message("Failing execution.\n"); | |
ff0af2a1 | 2237 | *exit_status = 0; |
d35fbf6b DM |
2238 | return 0; |
2239 | } | |
2240 | } | |
1a63a750 | 2241 | |
29206d46 LP |
2242 | if (context->dynamic_user && dcreds) { |
2243 | ||
409093fe LP |
2244 | /* Make sure we bypass our own NSS module for any NSS checks */ |
2245 | if (putenv((char*) "SYSTEMD_NSS_DYNAMIC_BYPASS=1") != 0) { | |
2246 | *exit_status = EXIT_USER; | |
2247 | return -errno; | |
2248 | } | |
2249 | ||
29206d46 | 2250 | r = dynamic_creds_realize(dcreds, &uid, &gid); |
ff0af2a1 LP |
2251 | if (r < 0) { |
2252 | *exit_status = EXIT_USER; | |
2253 | return r; | |
524daa8c | 2254 | } |
524daa8c | 2255 | |
92b25bca | 2256 | if (!uid_is_valid(uid) || !gid_is_valid(gid)) { |
29206d46 LP |
2257 | *exit_status = EXIT_USER; |
2258 | return -ESRCH; | |
2259 | } | |
5bc7452b | 2260 | |
29206d46 LP |
2261 | if (dcreds->user) |
2262 | username = dcreds->user->name; | |
2263 | ||
2264 | } else { | |
2265 | if (context->user) { | |
2266 | username = context->user; | |
be39ccf3 | 2267 | r = get_user_creds_clean(&username, &uid, &gid, &home, &shell); |
29206d46 LP |
2268 | if (r < 0) { |
2269 | *exit_status = EXIT_USER; | |
2270 | return r; | |
2271 | } | |
70493828 | 2272 | |
629ff674 | 2273 | /* Note that we don't set $HOME or $SHELL if they are not particularly enlightening anyway |
be39ccf3 | 2274 | * (i.e. are "/" or "/bin/nologin"). */ |
5bc7452b | 2275 | } |
5bc7452b | 2276 | |
29206d46 LP |
2277 | if (context->group) { |
2278 | const char *g = context->group; | |
2279 | ||
2280 | r = get_group_creds(&g, &gid); | |
2281 | if (r < 0) { | |
2282 | *exit_status = EXIT_GROUP; | |
2283 | return r; | |
2284 | } | |
2285 | } | |
2286 | } | |
5bc7452b | 2287 | |
00d9ef85 LP |
2288 | r = send_user_lookup(unit, user_lookup_fd, uid, gid); |
2289 | if (r < 0) { | |
2290 | *exit_status = EXIT_USER; | |
2291 | return r; | |
2292 | } | |
2293 | ||
2294 | user_lookup_fd = safe_close(user_lookup_fd); | |
2295 | ||
d35fbf6b DM |
2296 | /* If a socket is connected to STDIN/STDOUT/STDERR, we |
2297 | * must sure to drop O_NONBLOCK */ | |
2298 | if (socket_fd >= 0) | |
a34ceba6 | 2299 | (void) fd_nonblock(socket_fd, false); |
acbb0225 | 2300 | |
a34ceba6 | 2301 | r = setup_input(context, params, socket_fd); |
ff0af2a1 LP |
2302 | if (r < 0) { |
2303 | *exit_status = EXIT_STDIN; | |
2304 | return r; | |
d35fbf6b | 2305 | } |
034c6ed7 | 2306 | |
7bce046b | 2307 | r = setup_output(unit, context, params, STDOUT_FILENO, socket_fd, basename(command->path), uid, gid, &journal_stream_dev, &journal_stream_ino); |
ff0af2a1 LP |
2308 | if (r < 0) { |
2309 | *exit_status = EXIT_STDOUT; | |
2310 | return r; | |
d35fbf6b DM |
2311 | } |
2312 | ||
7bce046b | 2313 | r = setup_output(unit, context, params, STDERR_FILENO, socket_fd, basename(command->path), uid, gid, &journal_stream_dev, &journal_stream_ino); |
ff0af2a1 LP |
2314 | if (r < 0) { |
2315 | *exit_status = EXIT_STDERR; | |
2316 | return r; | |
d35fbf6b DM |
2317 | } |
2318 | ||
2319 | if (params->cgroup_path) { | |
ff0af2a1 LP |
2320 | r = cg_attach_everywhere(params->cgroup_supported, params->cgroup_path, 0, NULL, NULL); |
2321 | if (r < 0) { | |
2322 | *exit_status = EXIT_CGROUP; | |
2323 | return r; | |
309bff19 | 2324 | } |
d35fbf6b | 2325 | } |
309bff19 | 2326 | |
d35fbf6b | 2327 | if (context->oom_score_adjust_set) { |
d5243d62 | 2328 | char t[DECIMAL_STR_MAX(context->oom_score_adjust)]; |
f2b68789 | 2329 | |
d5243d62 LP |
2330 | /* When we can't make this change due to EPERM, then |
2331 | * let's silently skip over it. User namespaces | |
2332 | * prohibit write access to this file, and we | |
2333 | * shouldn't trip up over that. */ | |
613b411c | 2334 | |
d5243d62 | 2335 | sprintf(t, "%i", context->oom_score_adjust); |
ad118bda | 2336 | r = write_string_file("/proc/self/oom_score_adj", t, 0); |
6cb7fa17 | 2337 | if (r == -EPERM || r == -EACCES) { |
ff0af2a1 | 2338 | log_open(); |
f2341e0a | 2339 | log_unit_debug_errno(unit, r, "Failed to adjust OOM setting, assuming containerized execution, ignoring: %m"); |
ff0af2a1 LP |
2340 | log_close(); |
2341 | } else if (r < 0) { | |
2342 | *exit_status = EXIT_OOM_ADJUST; | |
d35fbf6b | 2343 | return -errno; |
613b411c | 2344 | } |
d35fbf6b DM |
2345 | } |
2346 | ||
2347 | if (context->nice_set) | |
2348 | if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) { | |
ff0af2a1 | 2349 | *exit_status = EXIT_NICE; |
d35fbf6b | 2350 | return -errno; |
613b411c LP |
2351 | } |
2352 | ||
d35fbf6b DM |
2353 | if (context->cpu_sched_set) { |
2354 | struct sched_param param = { | |
2355 | .sched_priority = context->cpu_sched_priority, | |
2356 | }; | |
2357 | ||
ff0af2a1 LP |
2358 | r = sched_setscheduler(0, |
2359 | context->cpu_sched_policy | | |
2360 | (context->cpu_sched_reset_on_fork ? | |
2361 | SCHED_RESET_ON_FORK : 0), | |
2362 | ¶m); | |
2363 | if (r < 0) { | |
2364 | *exit_status = EXIT_SETSCHEDULER; | |
d35fbf6b | 2365 | return -errno; |
fc9b2a84 | 2366 | } |
d35fbf6b | 2367 | } |
fc9b2a84 | 2368 | |
d35fbf6b DM |
2369 | if (context->cpuset) |
2370 | if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) { | |
ff0af2a1 | 2371 | *exit_status = EXIT_CPUAFFINITY; |
d35fbf6b | 2372 | return -errno; |
034c6ed7 LP |
2373 | } |
2374 | ||
d35fbf6b DM |
2375 | if (context->ioprio_set) |
2376 | if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) { | |
ff0af2a1 | 2377 | *exit_status = EXIT_IOPRIO; |
d35fbf6b DM |
2378 | return -errno; |
2379 | } | |
da726a4d | 2380 | |
d35fbf6b DM |
2381 | if (context->timer_slack_nsec != NSEC_INFINITY) |
2382 | if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) { | |
ff0af2a1 | 2383 | *exit_status = EXIT_TIMERSLACK; |
d35fbf6b | 2384 | return -errno; |
4c2630eb | 2385 | } |
9eba9da4 | 2386 | |
050f7277 | 2387 | if (context->personality != PERSONALITY_INVALID) |
d35fbf6b | 2388 | if (personality(context->personality) < 0) { |
ff0af2a1 | 2389 | *exit_status = EXIT_PERSONALITY; |
d35fbf6b | 2390 | return -errno; |
4c2630eb | 2391 | } |
94f04347 | 2392 | |
d35fbf6b | 2393 | if (context->utmp_id) |
023a4f67 LP |
2394 | utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path, |
2395 | context->utmp_mode == EXEC_UTMP_INIT ? INIT_PROCESS : | |
2396 | context->utmp_mode == EXEC_UTMP_LOGIN ? LOGIN_PROCESS : | |
2397 | USER_PROCESS, | |
2398 | username ? "root" : context->user); | |
d35fbf6b | 2399 | |
e0d2adfd | 2400 | if (context->user) { |
ff0af2a1 LP |
2401 | r = chown_terminal(STDIN_FILENO, uid); |
2402 | if (r < 0) { | |
2403 | *exit_status = EXIT_STDIN; | |
2404 | return r; | |
071830ff | 2405 | } |
d35fbf6b | 2406 | } |
8e274523 | 2407 | |
a931ad47 LP |
2408 | /* If delegation is enabled we'll pass ownership of the cgroup |
2409 | * (but only in systemd's own controller hierarchy!) to the | |
2410 | * user of the new process. */ | |
2411 | if (params->cgroup_path && context->user && params->cgroup_delegate) { | |
ff0af2a1 LP |
2412 | r = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0644, uid, gid); |
2413 | if (r < 0) { | |
2414 | *exit_status = EXIT_CGROUP; | |
2415 | return r; | |
d35fbf6b | 2416 | } |
034c6ed7 | 2417 | |
034c6ed7 | 2418 | |
ff0af2a1 LP |
2419 | r = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0755, uid, gid); |
2420 | if (r < 0) { | |
2421 | *exit_status = EXIT_CGROUP; | |
2422 | return r; | |
034c6ed7 | 2423 | } |
d35fbf6b | 2424 | } |
034c6ed7 | 2425 | |
d35fbf6b | 2426 | if (!strv_isempty(context->runtime_directory) && params->runtime_prefix) { |
07689d5d LP |
2427 | r = setup_runtime_directory(context, params, uid, gid); |
2428 | if (r < 0) { | |
2429 | *exit_status = EXIT_RUNTIME_DIRECTORY; | |
2430 | return r; | |
d35fbf6b DM |
2431 | } |
2432 | } | |
94f04347 | 2433 | |
7bce046b | 2434 | r = build_environment( |
fd63e712 | 2435 | unit, |
7bce046b LP |
2436 | context, |
2437 | params, | |
2438 | n_fds, | |
2439 | home, | |
2440 | username, | |
2441 | shell, | |
2442 | journal_stream_dev, | |
2443 | journal_stream_ino, | |
2444 | &our_env); | |
2065ca69 JW |
2445 | if (r < 0) { |
2446 | *exit_status = EXIT_MEMORY; | |
2447 | return r; | |
2448 | } | |
2449 | ||
2450 | r = build_pass_environment(context, &pass_env); | |
2451 | if (r < 0) { | |
2452 | *exit_status = EXIT_MEMORY; | |
2453 | return r; | |
2454 | } | |
2455 | ||
2456 | accum_env = strv_env_merge(5, | |
2457 | params->environment, | |
2458 | our_env, | |
2459 | pass_env, | |
2460 | context->environment, | |
2461 | files_env, | |
2462 | NULL); | |
2463 | if (!accum_env) { | |
2464 | *exit_status = EXIT_MEMORY; | |
2465 | return -ENOMEM; | |
2466 | } | |
1280503b | 2467 | accum_env = strv_env_clean(accum_env); |
2065ca69 | 2468 | |
096424d1 | 2469 | (void) umask(context->umask); |
b213e1c1 | 2470 | |
c39f1ce2 | 2471 | if ((params->flags & EXEC_APPLY_PERMISSIONS) && !command->privileged) { |
cefc33ae LP |
2472 | r = setup_smack(context, command); |
2473 | if (r < 0) { | |
2474 | *exit_status = EXIT_SMACK_PROCESS_LABEL; | |
2475 | return r; | |
6bf6e43e | 2476 | } |
6bf6e43e | 2477 | |
b213e1c1 | 2478 | if (context->pam_name && username) { |
2d6fce8d | 2479 | r = setup_pam(context->pam_name, username, uid, gid, context->tty_path, &accum_env, fds, n_fds); |
b213e1c1 SW |
2480 | if (r < 0) { |
2481 | *exit_status = EXIT_PAM; | |
2482 | return r; | |
2483 | } | |
d35fbf6b | 2484 | } |
b213e1c1 | 2485 | } |
ac45f971 | 2486 | |
d35fbf6b | 2487 | if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) { |
ff0af2a1 LP |
2488 | r = setup_netns(runtime->netns_storage_socket); |
2489 | if (r < 0) { | |
2490 | *exit_status = EXIT_NETWORK; | |
2491 | return r; | |
d35fbf6b DM |
2492 | } |
2493 | } | |
169c1bda | 2494 | |
ee818b89 | 2495 | needs_mount_namespace = exec_needs_mount_namespace(context, params, runtime); |
ee818b89 | 2496 | if (needs_mount_namespace) { |
3fbe8dbe | 2497 | _cleanup_free_ char **rw = NULL; |
d35fbf6b | 2498 | char *tmp = NULL, *var = NULL; |
c575770b DH |
2499 | NameSpaceInfo ns_info = { |
2500 | .private_dev = context->private_devices, | |
2501 | .protect_control_groups = context->protect_control_groups, | |
2502 | .protect_kernel_tunables = context->protect_kernel_tunables, | |
2503 | .protect_kernel_modules = context->protect_kernel_modules, | |
2504 | }; | |
d35fbf6b DM |
2505 | |
2506 | /* The runtime struct only contains the parent | |
2507 | * of the private /tmp, which is | |
2508 | * non-accessible to world users. Inside of it | |
2509 | * there's a /tmp that is sticky, and that's | |
2510 | * the one we want to use here. */ | |
2511 | ||
2512 | if (context->private_tmp && runtime) { | |
2513 | if (runtime->tmp_dir) | |
63c372cb | 2514 | tmp = strjoina(runtime->tmp_dir, "/tmp"); |
d35fbf6b | 2515 | if (runtime->var_tmp_dir) |
63c372cb | 2516 | var = strjoina(runtime->var_tmp_dir, "/tmp"); |
d35fbf6b | 2517 | } |
d8b4e2e9 | 2518 | |
3fbe8dbe LP |
2519 | r = compile_read_write_paths(context, params, &rw); |
2520 | if (r < 0) { | |
2521 | *exit_status = EXIT_NAMESPACE; | |
2522 | return r; | |
2523 | } | |
2524 | ||
ff0af2a1 | 2525 | r = setup_namespace( |
c39f1ce2 | 2526 | (params->flags & EXEC_APPLY_CHROOT) ? context->root_directory : NULL, |
c575770b | 2527 | &ns_info, |
3fbe8dbe | 2528 | rw, |
2a624c36 AP |
2529 | context->read_only_paths, |
2530 | context->inaccessible_paths, | |
d35fbf6b DM |
2531 | tmp, |
2532 | var, | |
d35fbf6b DM |
2533 | context->protect_home, |
2534 | context->protect_system, | |
2535 | context->mount_flags); | |
0015ebf3 | 2536 | |
ff0af2a1 LP |
2537 | /* If we couldn't set up the namespace this is |
2538 | * probably due to a missing capability. In this case, | |
2539 | * silently proceeed. */ | |
2540 | if (r == -EPERM || r == -EACCES) { | |
2541 | log_open(); | |
f2341e0a | 2542 | log_unit_debug_errno(unit, r, "Failed to set up namespace, assuming containerized execution, ignoring: %m"); |
ff0af2a1 LP |
2543 | log_close(); |
2544 | } else if (r < 0) { | |
2545 | *exit_status = EXIT_NAMESPACE; | |
2546 | return r; | |
81a2b7ce | 2547 | } |
d35fbf6b | 2548 | } |
81a2b7ce | 2549 | |
096424d1 LP |
2550 | if ((params->flags & EXEC_APPLY_PERMISSIONS) && !command->privileged) { |
2551 | r = enforce_groups(context, username, gid); | |
2552 | if (r < 0) { | |
2553 | *exit_status = EXIT_GROUP; | |
2554 | return r; | |
2555 | } | |
2556 | } | |
2557 | ||
5f5d8eab LP |
2558 | if (context->working_directory_home) |
2559 | wd = home; | |
2560 | else if (context->working_directory) | |
2561 | wd = context->working_directory; | |
2562 | else | |
2563 | wd = "/"; | |
2564 | ||
c39f1ce2 | 2565 | if (params->flags & EXEC_APPLY_CHROOT) { |
ee818b89 | 2566 | if (!needs_mount_namespace && context->root_directory) |
d35fbf6b | 2567 | if (chroot(context->root_directory) < 0) { |
ff0af2a1 | 2568 | *exit_status = EXIT_CHROOT; |
d35fbf6b | 2569 | return -errno; |
8aa75193 LP |
2570 | } |
2571 | ||
5f5d8eab | 2572 | if (chdir(wd) < 0 && |
4c08c824 | 2573 | !context->working_directory_missing_ok) { |
ff0af2a1 | 2574 | *exit_status = EXIT_CHDIR; |
d35fbf6b DM |
2575 | return -errno; |
2576 | } | |
2577 | } else { | |
5f5d8eab | 2578 | const char *d; |
8aa75193 | 2579 | |
5f5d8eab | 2580 | d = strjoina(strempty(context->root_directory), "/", strempty(wd)); |
cf1d0302 LP |
2581 | if (chdir(d) < 0 && |
2582 | !context->working_directory_missing_ok) { | |
ff0af2a1 | 2583 | *exit_status = EXIT_CHDIR; |
d35fbf6b DM |
2584 | return -errno; |
2585 | } | |
2586 | } | |
e66cf1a3 | 2587 | |
9008e1ac | 2588 | #ifdef HAVE_SELINUX |
c39f1ce2 LP |
2589 | if ((params->flags & EXEC_APPLY_PERMISSIONS) && |
2590 | mac_selinux_use() && | |
2591 | params->selinux_context_net && | |
2592 | socket_fd >= 0 && | |
2593 | !command->privileged) { | |
2594 | ||
ff0af2a1 LP |
2595 | r = mac_selinux_get_child_mls_label(socket_fd, command->path, context->selinux_context, &mac_selinux_context_net); |
2596 | if (r < 0) { | |
2597 | *exit_status = EXIT_SELINUX_CONTEXT; | |
2598 | return r; | |
9008e1ac MS |
2599 | } |
2600 | } | |
2601 | #endif | |
2602 | ||
d87a2ef7 | 2603 | if ((params->flags & EXEC_APPLY_PERMISSIONS) && context->private_users) { |
d251207d LP |
2604 | r = setup_private_users(uid, gid); |
2605 | if (r < 0) { | |
2606 | *exit_status = EXIT_USER; | |
2607 | return r; | |
2608 | } | |
2609 | } | |
2610 | ||
d35fbf6b DM |
2611 | /* We repeat the fd closing here, to make sure that |
2612 | * nothing is leaked from the PAM modules. Note that | |
2613 | * we are more aggressive this time since socket_fd | |
e44da745 DM |
2614 | * and the netns fds we don't need anymore. The custom |
2615 | * endpoint fd was needed to upload the policy and can | |
2616 | * now be closed as well. */ | |
ff0af2a1 LP |
2617 | r = close_all_fds(fds, n_fds); |
2618 | if (r >= 0) | |
2619 | r = shift_fds(fds, n_fds); | |
2620 | if (r >= 0) | |
2621 | r = flags_fds(fds, n_fds, context->non_blocking); | |
2622 | if (r < 0) { | |
2623 | *exit_status = EXIT_FDS; | |
2624 | return r; | |
d35fbf6b | 2625 | } |
e66cf1a3 | 2626 | |
c39f1ce2 | 2627 | if ((params->flags & EXEC_APPLY_PERMISSIONS) && !command->privileged) { |
e66cf1a3 | 2628 | |
755d4b67 IP |
2629 | int secure_bits = context->secure_bits; |
2630 | ||
d35fbf6b | 2631 | for (i = 0; i < _RLIMIT_MAX; i++) { |
03857c43 | 2632 | |
d35fbf6b DM |
2633 | if (!context->rlimit[i]) |
2634 | continue; | |
2635 | ||
03857c43 LP |
2636 | r = setrlimit_closest(i, context->rlimit[i]); |
2637 | if (r < 0) { | |
ff0af2a1 | 2638 | *exit_status = EXIT_LIMITS; |
03857c43 | 2639 | return r; |
e66cf1a3 LP |
2640 | } |
2641 | } | |
2642 | ||
f4170c67 LP |
2643 | /* Set the RTPRIO resource limit to 0, but only if nothing else was explicitly requested. */ |
2644 | if (context->restrict_realtime && !context->rlimit[RLIMIT_RTPRIO]) { | |
2645 | if (setrlimit(RLIMIT_RTPRIO, &RLIMIT_MAKE_CONST(0)) < 0) { | |
2646 | *exit_status = EXIT_LIMITS; | |
2647 | return -errno; | |
2648 | } | |
2649 | } | |
2650 | ||
a103496c IP |
2651 | if (!cap_test_all(context->capability_bounding_set)) { |
2652 | r = capability_bounding_set_drop(context->capability_bounding_set, false); | |
ff0af2a1 LP |
2653 | if (r < 0) { |
2654 | *exit_status = EXIT_CAPABILITIES; | |
2655 | return r; | |
3b8bddde | 2656 | } |
4c2630eb | 2657 | } |
3b8bddde | 2658 | |
755d4b67 IP |
2659 | /* This is done before enforce_user, but ambient set |
2660 | * does not survive over setresuid() if keep_caps is not set. */ | |
2661 | if (context->capability_ambient_set != 0) { | |
2662 | r = capability_ambient_set_apply(context->capability_ambient_set, true); | |
2663 | if (r < 0) { | |
2664 | *exit_status = EXIT_CAPABILITIES; | |
2665 | return r; | |
2666 | } | |
755d4b67 IP |
2667 | } |
2668 | ||
d35fbf6b | 2669 | if (context->user) { |
ff0af2a1 LP |
2670 | r = enforce_user(context, uid); |
2671 | if (r < 0) { | |
2672 | *exit_status = EXIT_USER; | |
2673 | return r; | |
5b6319dc | 2674 | } |
755d4b67 IP |
2675 | if (context->capability_ambient_set != 0) { |
2676 | ||
2677 | /* Fix the ambient capabilities after user change. */ | |
2678 | r = capability_ambient_set_apply(context->capability_ambient_set, false); | |
2679 | if (r < 0) { | |
2680 | *exit_status = EXIT_CAPABILITIES; | |
2681 | return r; | |
2682 | } | |
2683 | ||
2684 | /* If we were asked to change user and ambient capabilities | |
2685 | * were requested, we had to add keep-caps to the securebits | |
2686 | * so that we would maintain the inherited capability set | |
2687 | * through the setresuid(). Make sure that the bit is added | |
2688 | * also to the context secure_bits so that we don't try to | |
2689 | * drop the bit away next. */ | |
2690 | ||
7f508f2c | 2691 | secure_bits |= 1<<SECURE_KEEP_CAPS; |
755d4b67 | 2692 | } |
5b6319dc | 2693 | } |
d35fbf6b DM |
2694 | |
2695 | /* PR_GET_SECUREBITS is not privileged, while | |
2696 | * PR_SET_SECUREBITS is. So to suppress | |
2697 | * potential EPERMs we'll try not to call | |
2698 | * PR_SET_SECUREBITS unless necessary. */ | |
755d4b67 IP |
2699 | if (prctl(PR_GET_SECUREBITS) != secure_bits) |
2700 | if (prctl(PR_SET_SECUREBITS, secure_bits) < 0) { | |
ff0af2a1 | 2701 | *exit_status = EXIT_SECUREBITS; |
d35fbf6b | 2702 | return -errno; |
ff01d048 | 2703 | } |
5b6319dc | 2704 | |
59eeb84b | 2705 | if (context_has_no_new_privileges(context)) |
d35fbf6b | 2706 | if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) { |
ff0af2a1 | 2707 | *exit_status = EXIT_NO_NEW_PRIVILEGES; |
d35fbf6b DM |
2708 | return -errno; |
2709 | } | |
2710 | ||
2711 | #ifdef HAVE_SECCOMP | |
59eeb84b | 2712 | if (context_has_address_families(context)) { |
83f12b27 | 2713 | r = apply_address_families(unit, context); |
ff0af2a1 LP |
2714 | if (r < 0) { |
2715 | *exit_status = EXIT_ADDRESS_FAMILIES; | |
2716 | return r; | |
4c2630eb MS |
2717 | } |
2718 | } | |
04aa0cb9 | 2719 | |
f3e43635 | 2720 | if (context->memory_deny_write_execute) { |
83f12b27 | 2721 | r = apply_memory_deny_write_execute(unit, context); |
f3e43635 TM |
2722 | if (r < 0) { |
2723 | *exit_status = EXIT_SECCOMP; | |
2724 | return r; | |
2725 | } | |
2726 | } | |
f4170c67 LP |
2727 | |
2728 | if (context->restrict_realtime) { | |
83f12b27 | 2729 | r = apply_restrict_realtime(unit, context); |
f4170c67 LP |
2730 | if (r < 0) { |
2731 | *exit_status = EXIT_SECCOMP; | |
2732 | return r; | |
2733 | } | |
2734 | } | |
2735 | ||
59eeb84b LP |
2736 | if (context->protect_kernel_tunables) { |
2737 | r = apply_protect_sysctl(unit, context); | |
2738 | if (r < 0) { | |
2739 | *exit_status = EXIT_SECCOMP; | |
2740 | return r; | |
502d704e DH |
2741 | } |
2742 | } | |
2743 | ||
2744 | if (context->protect_kernel_modules) { | |
2745 | r = apply_protect_kernel_modules(unit, context); | |
2746 | if (r < 0) { | |
2747 | *exit_status = EXIT_SECCOMP; | |
2748 | return r; | |
59eeb84b LP |
2749 | } |
2750 | } | |
2751 | ||
ba128bb8 LP |
2752 | if (context->private_devices) { |
2753 | r = apply_private_devices(unit, context); | |
2754 | if (r < 0) { | |
2755 | *exit_status = EXIT_SECCOMP; | |
2756 | return r; | |
2757 | } | |
2758 | } | |
2759 | ||
59eeb84b | 2760 | if (context_has_syscall_filters(context)) { |
83f12b27 | 2761 | r = apply_seccomp(unit, context); |
ff0af2a1 LP |
2762 | if (r < 0) { |
2763 | *exit_status = EXIT_SECCOMP; | |
2764 | return r; | |
81a2b7ce | 2765 | } |
d35fbf6b DM |
2766 | } |
2767 | #endif | |
81a2b7ce | 2768 | |
d35fbf6b | 2769 | #ifdef HAVE_SELINUX |
6baa7db0 | 2770 | if (mac_selinux_use()) { |
9008e1ac | 2771 | char *exec_context = mac_selinux_context_net ?: context->selinux_context; |
16115b0a | 2772 | |
9008e1ac | 2773 | if (exec_context) { |
ff0af2a1 LP |
2774 | r = setexeccon(exec_context); |
2775 | if (r < 0) { | |
2776 | *exit_status = EXIT_SELINUX_CONTEXT; | |
2777 | return r; | |
16115b0a | 2778 | } |
81a2b7ce | 2779 | } |
81a2b7ce | 2780 | } |
d35fbf6b | 2781 | #endif |
81a2b7ce | 2782 | |
d35fbf6b | 2783 | #ifdef HAVE_APPARMOR |
6baa7db0 | 2784 | if (context->apparmor_profile && mac_apparmor_use()) { |
ff0af2a1 LP |
2785 | r = aa_change_onexec(context->apparmor_profile); |
2786 | if (r < 0 && !context->apparmor_profile_ignore) { | |
2787 | *exit_status = EXIT_APPARMOR_PROFILE; | |
5482192e | 2788 | return -errno; |
d35fbf6b | 2789 | } |
034c6ed7 | 2790 | } |
d35fbf6b DM |
2791 | #endif |
2792 | } | |
034c6ed7 | 2793 | |
2065ca69 | 2794 | final_argv = replace_env_argv(argv, accum_env); |
d35fbf6b | 2795 | if (!final_argv) { |
ff0af2a1 | 2796 | *exit_status = EXIT_MEMORY; |
d35fbf6b DM |
2797 | return -ENOMEM; |
2798 | } | |
034c6ed7 | 2799 | |
553d2243 | 2800 | if (_unlikely_(log_get_max_level() >= LOG_DEBUG)) { |
d35fbf6b | 2801 | _cleanup_free_ char *line; |
81a2b7ce | 2802 | |
d35fbf6b DM |
2803 | line = exec_command_line(final_argv); |
2804 | if (line) { | |
2805 | log_open(); | |
f2341e0a LP |
2806 | log_struct(LOG_DEBUG, |
2807 | LOG_UNIT_ID(unit), | |
2808 | "EXECUTABLE=%s", command->path, | |
2809 | LOG_UNIT_MESSAGE(unit, "Executing: %s", line), | |
2810 | NULL); | |
d35fbf6b DM |
2811 | log_close(); |
2812 | } | |
2813 | } | |
dd305ec9 | 2814 | |
2065ca69 | 2815 | execve(command->path, final_argv, accum_env); |
ff0af2a1 | 2816 | *exit_status = EXIT_EXEC; |
d35fbf6b DM |
2817 | return -errno; |
2818 | } | |
81a2b7ce | 2819 | |
f2341e0a LP |
2820 | int exec_spawn(Unit *unit, |
2821 | ExecCommand *command, | |
d35fbf6b DM |
2822 | const ExecContext *context, |
2823 | const ExecParameters *params, | |
2824 | ExecRuntime *runtime, | |
29206d46 | 2825 | DynamicCreds *dcreds, |
d35fbf6b | 2826 | pid_t *ret) { |
8351ceae | 2827 | |
d35fbf6b DM |
2828 | _cleanup_strv_free_ char **files_env = NULL; |
2829 | int *fds = NULL; unsigned n_fds = 0; | |
ff0af2a1 LP |
2830 | _cleanup_free_ char *line = NULL; |
2831 | int socket_fd, r; | |
2832 | char **argv; | |
d35fbf6b | 2833 | pid_t pid; |
8351ceae | 2834 | |
f2341e0a | 2835 | assert(unit); |
d35fbf6b DM |
2836 | assert(command); |
2837 | assert(context); | |
2838 | assert(ret); | |
2839 | assert(params); | |
2840 | assert(params->fds || params->n_fds <= 0); | |
4298d0b5 | 2841 | |
d35fbf6b DM |
2842 | if (context->std_input == EXEC_INPUT_SOCKET || |
2843 | context->std_output == EXEC_OUTPUT_SOCKET || | |
2844 | context->std_error == EXEC_OUTPUT_SOCKET) { | |
17df7223 | 2845 | |
ff0af2a1 | 2846 | if (params->n_fds != 1) { |
f2341e0a | 2847 | log_unit_error(unit, "Got more than one socket."); |
d35fbf6b | 2848 | return -EINVAL; |
ff0af2a1 | 2849 | } |
eef65bf3 | 2850 | |
d35fbf6b DM |
2851 | socket_fd = params->fds[0]; |
2852 | } else { | |
2853 | socket_fd = -1; | |
2854 | fds = params->fds; | |
2855 | n_fds = params->n_fds; | |
2856 | } | |
94f04347 | 2857 | |
f2341e0a | 2858 | r = exec_context_load_environment(unit, context, &files_env); |
ff0af2a1 | 2859 | if (r < 0) |
f2341e0a | 2860 | return log_unit_error_errno(unit, r, "Failed to load environment files: %m"); |
034c6ed7 | 2861 | |
d35fbf6b | 2862 | argv = params->argv ?: command->argv; |
d35fbf6b DM |
2863 | line = exec_command_line(argv); |
2864 | if (!line) | |
2865 | return log_oom(); | |
fab56fc5 | 2866 | |
f2341e0a LP |
2867 | log_struct(LOG_DEBUG, |
2868 | LOG_UNIT_ID(unit), | |
2869 | LOG_UNIT_MESSAGE(unit, "About to execute: %s", line), | |
2870 | "EXECUTABLE=%s", command->path, | |
2871 | NULL); | |
d35fbf6b DM |
2872 | pid = fork(); |
2873 | if (pid < 0) | |
74129a12 | 2874 | return log_unit_error_errno(unit, errno, "Failed to fork: %m"); |
d35fbf6b DM |
2875 | |
2876 | if (pid == 0) { | |
ff0af2a1 LP |
2877 | int exit_status; |
2878 | ||
f2341e0a LP |
2879 | r = exec_child(unit, |
2880 | command, | |
ff0af2a1 LP |
2881 | context, |
2882 | params, | |
2883 | runtime, | |
29206d46 | 2884 | dcreds, |
ff0af2a1 LP |
2885 | argv, |
2886 | socket_fd, | |
2887 | fds, n_fds, | |
2888 | files_env, | |
00d9ef85 | 2889 | unit->manager->user_lookup_fds[1], |
ff0af2a1 LP |
2890 | &exit_status); |
2891 | if (r < 0) { | |
4c2630eb | 2892 | log_open(); |
f2341e0a LP |
2893 | log_struct_errno(LOG_ERR, r, |
2894 | LOG_MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED), | |
2895 | LOG_UNIT_ID(unit), | |
2896 | LOG_UNIT_MESSAGE(unit, "Failed at step %s spawning %s: %m", | |
2897 | exit_status_to_string(exit_status, EXIT_STATUS_SYSTEMD), | |
2898 | command->path), | |
2899 | "EXECUTABLE=%s", command->path, | |
2900 | NULL); | |
4c2630eb MS |
2901 | } |
2902 | ||
ff0af2a1 | 2903 | _exit(exit_status); |
034c6ed7 LP |
2904 | } |
2905 | ||
f2341e0a | 2906 | log_unit_debug(unit, "Forked %s as "PID_FMT, command->path, pid); |
23635a85 | 2907 | |
80876c20 LP |
2908 | /* We add the new process to the cgroup both in the child (so |
2909 | * that we can be sure that no user code is ever executed | |
2910 | * outside of the cgroup) and in the parent (so that we can be | |
2911 | * sure that when we kill the cgroup the process will be | |
2912 | * killed too). */ | |
d35fbf6b | 2913 | if (params->cgroup_path) |
dd305ec9 | 2914 | (void) cg_attach(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, pid); |
2da3263a | 2915 | |
b58b4116 | 2916 | exec_status_start(&command->exec_status, pid); |
9fb86720 | 2917 | |
034c6ed7 | 2918 | *ret = pid; |
5cb5a6ff LP |
2919 | return 0; |
2920 | } | |
2921 | ||
034c6ed7 LP |
2922 | void exec_context_init(ExecContext *c) { |
2923 | assert(c); | |
2924 | ||
4c12626c | 2925 | c->umask = 0022; |
9eba9da4 | 2926 | c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0); |
94f04347 | 2927 | c->cpu_sched_policy = SCHED_OTHER; |
071830ff | 2928 | c->syslog_priority = LOG_DAEMON|LOG_INFO; |
74922904 | 2929 | c->syslog_level_prefix = true; |
353e12c2 | 2930 | c->ignore_sigpipe = true; |
3a43da28 | 2931 | c->timer_slack_nsec = NSEC_INFINITY; |
050f7277 | 2932 | c->personality = PERSONALITY_INVALID; |
e66cf1a3 | 2933 | c->runtime_directory_mode = 0755; |
a103496c | 2934 | c->capability_bounding_set = CAP_ALL; |
034c6ed7 LP |
2935 | } |
2936 | ||
613b411c | 2937 | void exec_context_done(ExecContext *c) { |
5cb5a6ff LP |
2938 | unsigned l; |
2939 | ||
2940 | assert(c); | |
2941 | ||
6796073e LP |
2942 | c->environment = strv_free(c->environment); |
2943 | c->environment_files = strv_free(c->environment_files); | |
b4c14404 | 2944 | c->pass_environment = strv_free(c->pass_environment); |
8c7be95e | 2945 | |
1f6b4113 | 2946 | for (l = 0; l < ELEMENTSOF(c->rlimit); l++) |
a1e58e8e | 2947 | c->rlimit[l] = mfree(c->rlimit[l]); |
034c6ed7 | 2948 | |
a1e58e8e LP |
2949 | c->working_directory = mfree(c->working_directory); |
2950 | c->root_directory = mfree(c->root_directory); | |
2951 | c->tty_path = mfree(c->tty_path); | |
2952 | c->syslog_identifier = mfree(c->syslog_identifier); | |
2953 | c->user = mfree(c->user); | |
2954 | c->group = mfree(c->group); | |
034c6ed7 | 2955 | |
6796073e | 2956 | c->supplementary_groups = strv_free(c->supplementary_groups); |
94f04347 | 2957 | |
a1e58e8e | 2958 | c->pam_name = mfree(c->pam_name); |
5b6319dc | 2959 | |
2a624c36 AP |
2960 | c->read_only_paths = strv_free(c->read_only_paths); |
2961 | c->read_write_paths = strv_free(c->read_write_paths); | |
2962 | c->inaccessible_paths = strv_free(c->inaccessible_paths); | |
82c121a4 LP |
2963 | |
2964 | if (c->cpuset) | |
2965 | CPU_FREE(c->cpuset); | |
86a3475b | 2966 | |
a1e58e8e LP |
2967 | c->utmp_id = mfree(c->utmp_id); |
2968 | c->selinux_context = mfree(c->selinux_context); | |
2969 | c->apparmor_profile = mfree(c->apparmor_profile); | |
eef65bf3 | 2970 | |
525d3cc7 LP |
2971 | c->syscall_filter = set_free(c->syscall_filter); |
2972 | c->syscall_archs = set_free(c->syscall_archs); | |
2973 | c->address_families = set_free(c->address_families); | |
e66cf1a3 | 2974 | |
6796073e | 2975 | c->runtime_directory = strv_free(c->runtime_directory); |
e66cf1a3 LP |
2976 | } |
2977 | ||
2978 | int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) { | |
2979 | char **i; | |
2980 | ||
2981 | assert(c); | |
2982 | ||
2983 | if (!runtime_prefix) | |
2984 | return 0; | |
2985 | ||
2986 | STRV_FOREACH(i, c->runtime_directory) { | |
2987 | _cleanup_free_ char *p; | |
2988 | ||
2989 | p = strjoin(runtime_prefix, "/", *i, NULL); | |
2990 | if (!p) | |
2991 | return -ENOMEM; | |
2992 | ||
2993 | /* We execute this synchronously, since we need to be | |
2994 | * sure this is gone when we start the service | |
2995 | * next. */ | |
c6878637 | 2996 | (void) rm_rf(p, REMOVE_ROOT); |
e66cf1a3 LP |
2997 | } |
2998 | ||
2999 | return 0; | |
5cb5a6ff LP |
3000 | } |
3001 | ||
43d0fcbd LP |
3002 | void exec_command_done(ExecCommand *c) { |
3003 | assert(c); | |
3004 | ||
a1e58e8e | 3005 | c->path = mfree(c->path); |
43d0fcbd | 3006 | |
6796073e | 3007 | c->argv = strv_free(c->argv); |
43d0fcbd LP |
3008 | } |
3009 | ||
3010 | void exec_command_done_array(ExecCommand *c, unsigned n) { | |
3011 | unsigned i; | |
3012 | ||
3013 | for (i = 0; i < n; i++) | |
3014 | exec_command_done(c+i); | |
3015 | } | |
3016 | ||
f1acf85a | 3017 | ExecCommand* exec_command_free_list(ExecCommand *c) { |
5cb5a6ff LP |
3018 | ExecCommand *i; |
3019 | ||
3020 | while ((i = c)) { | |
71fda00f | 3021 | LIST_REMOVE(command, c, i); |
43d0fcbd | 3022 | exec_command_done(i); |
5cb5a6ff LP |
3023 | free(i); |
3024 | } | |
f1acf85a ZJS |
3025 | |
3026 | return NULL; | |
5cb5a6ff LP |
3027 | } |
3028 | ||
034c6ed7 LP |
3029 | void exec_command_free_array(ExecCommand **c, unsigned n) { |
3030 | unsigned i; | |
3031 | ||
f1acf85a ZJS |
3032 | for (i = 0; i < n; i++) |
3033 | c[i] = exec_command_free_list(c[i]); | |
034c6ed7 LP |
3034 | } |
3035 | ||
039f0e70 | 3036 | typedef struct InvalidEnvInfo { |
f2341e0a | 3037 | Unit *unit; |
039f0e70 LP |
3038 | const char *path; |
3039 | } InvalidEnvInfo; | |
3040 | ||
3041 | static void invalid_env(const char *p, void *userdata) { | |
3042 | InvalidEnvInfo *info = userdata; | |
3043 | ||
f2341e0a | 3044 | log_unit_error(info->unit, "Ignoring invalid environment assignment '%s': %s", p, info->path); |
039f0e70 LP |
3045 | } |
3046 | ||
f2341e0a | 3047 | int exec_context_load_environment(Unit *unit, const ExecContext *c, char ***l) { |
8c7be95e LP |
3048 | char **i, **r = NULL; |
3049 | ||
3050 | assert(c); | |
3051 | assert(l); | |
3052 | ||
3053 | STRV_FOREACH(i, c->environment_files) { | |
3054 | char *fn; | |
3055 | int k; | |
3056 | bool ignore = false; | |
3057 | char **p; | |
7fd1b19b | 3058 | _cleanup_globfree_ glob_t pglob = {}; |
2bef10ab | 3059 | int count, n; |
8c7be95e LP |
3060 | |
3061 | fn = *i; | |
3062 | ||
3063 | if (fn[0] == '-') { | |
3064 | ignore = true; | |
313cefa1 | 3065 | fn++; |
8c7be95e LP |
3066 | } |
3067 | ||
3068 | if (!path_is_absolute(fn)) { | |
8c7be95e LP |
3069 | if (ignore) |
3070 | continue; | |
3071 | ||
3072 | strv_free(r); | |
3073 | return -EINVAL; | |
3074 | } | |
3075 | ||
2bef10ab | 3076 | /* Filename supports globbing, take all matching files */ |
2bef10ab PL |
3077 | errno = 0; |
3078 | if (glob(fn, 0, NULL, &pglob) != 0) { | |
2bef10ab PL |
3079 | if (ignore) |
3080 | continue; | |
8c7be95e | 3081 | |
2bef10ab | 3082 | strv_free(r); |
f5e5c28f | 3083 | return errno > 0 ? -errno : -EINVAL; |
2bef10ab PL |
3084 | } |
3085 | count = pglob.gl_pathc; | |
3086 | if (count == 0) { | |
8c7be95e LP |
3087 | if (ignore) |
3088 | continue; | |
3089 | ||
3090 | strv_free(r); | |
2bef10ab | 3091 | return -EINVAL; |
8c7be95e | 3092 | } |
2bef10ab | 3093 | for (n = 0; n < count; n++) { |
717603e3 | 3094 | k = load_env_file(NULL, pglob.gl_pathv[n], NULL, &p); |
2bef10ab PL |
3095 | if (k < 0) { |
3096 | if (ignore) | |
3097 | continue; | |
8c7be95e | 3098 | |
2bef10ab | 3099 | strv_free(r); |
2bef10ab | 3100 | return k; |
e9c1ea9d | 3101 | } |
ebc05a09 | 3102 | /* Log invalid environment variables with filename */ |
039f0e70 LP |
3103 | if (p) { |
3104 | InvalidEnvInfo info = { | |
f2341e0a | 3105 | .unit = unit, |
039f0e70 LP |
3106 | .path = pglob.gl_pathv[n] |
3107 | }; | |
3108 | ||
3109 | p = strv_env_clean_with_callback(p, invalid_env, &info); | |
3110 | } | |
8c7be95e | 3111 | |
2bef10ab PL |
3112 | if (r == NULL) |
3113 | r = p; | |
3114 | else { | |
3115 | char **m; | |
8c7be95e | 3116 | |
2bef10ab PL |
3117 | m = strv_env_merge(2, r, p); |
3118 | strv_free(r); | |
3119 | strv_free(p); | |
c84a9488 | 3120 | if (!m) |
2bef10ab | 3121 | return -ENOMEM; |
2bef10ab PL |
3122 | |
3123 | r = m; | |
3124 | } | |
8c7be95e LP |
3125 | } |
3126 | } | |
3127 | ||
3128 | *l = r; | |
3129 | ||
3130 | return 0; | |
3131 | } | |
3132 | ||
6ac8fdc9 | 3133 | static bool tty_may_match_dev_console(const char *tty) { |
e1d75803 | 3134 | _cleanup_free_ char *active = NULL; |
7d6884b6 | 3135 | char *console; |
6ac8fdc9 | 3136 | |
1e22b5cd LP |
3137 | if (!tty) |
3138 | return true; | |
3139 | ||
6ac8fdc9 MS |
3140 | if (startswith(tty, "/dev/")) |
3141 | tty += 5; | |
3142 | ||
3143 | /* trivial identity? */ | |
3144 | if (streq(tty, "console")) | |
3145 | return true; | |
3146 | ||
3147 | console = resolve_dev_console(&active); | |
3148 | /* if we could not resolve, assume it may */ | |
3149 | if (!console) | |
3150 | return true; | |
3151 | ||
3152 | /* "tty0" means the active VC, so it may be the same sometimes */ | |
e1d75803 | 3153 | return streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty)); |
6ac8fdc9 MS |
3154 | } |
3155 | ||
3156 | bool exec_context_may_touch_console(ExecContext *ec) { | |
1e22b5cd LP |
3157 | |
3158 | return (ec->tty_reset || | |
3159 | ec->tty_vhangup || | |
3160 | ec->tty_vt_disallocate || | |
6ac8fdc9 MS |
3161 | is_terminal_input(ec->std_input) || |
3162 | is_terminal_output(ec->std_output) || | |
3163 | is_terminal_output(ec->std_error)) && | |
1e22b5cd | 3164 | tty_may_match_dev_console(exec_context_tty_path(ec)); |
6ac8fdc9 MS |
3165 | } |
3166 | ||
15ae422b LP |
3167 | static void strv_fprintf(FILE *f, char **l) { |
3168 | char **g; | |
3169 | ||
3170 | assert(f); | |
3171 | ||
3172 | STRV_FOREACH(g, l) | |
3173 | fprintf(f, " %s", *g); | |
3174 | } | |
3175 | ||
5cb5a6ff | 3176 | void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { |
c2bbd90b | 3177 | char **e, **d; |
94f04347 | 3178 | unsigned i; |
9eba9da4 | 3179 | |
5cb5a6ff LP |
3180 | assert(c); |
3181 | assert(f); | |
3182 | ||
4ad49000 | 3183 | prefix = strempty(prefix); |
5cb5a6ff LP |
3184 | |
3185 | fprintf(f, | |
94f04347 LP |
3186 | "%sUMask: %04o\n" |
3187 | "%sWorkingDirectory: %s\n" | |
451a074f | 3188 | "%sRootDirectory: %s\n" |
15ae422b | 3189 | "%sNonBlocking: %s\n" |
64747e2d | 3190 | "%sPrivateTmp: %s\n" |
7f112f50 | 3191 | "%sPrivateDevices: %s\n" |
59eeb84b | 3192 | "%sProtectKernelTunables: %s\n" |
e66a2f65 | 3193 | "%sProtectKernelModules: %s\n" |
59eeb84b | 3194 | "%sProtectControlGroups: %s\n" |
d251207d LP |
3195 | "%sPrivateNetwork: %s\n" |
3196 | "%sPrivateUsers: %s\n" | |
1b8689f9 LP |
3197 | "%sProtectHome: %s\n" |
3198 | "%sProtectSystem: %s\n" | |
f3e43635 | 3199 | "%sIgnoreSIGPIPE: %s\n" |
f4170c67 LP |
3200 | "%sMemoryDenyWriteExecute: %s\n" |
3201 | "%sRestrictRealtime: %s\n", | |
5cb5a6ff | 3202 | prefix, c->umask, |
9eba9da4 | 3203 | prefix, c->working_directory ? c->working_directory : "/", |
451a074f | 3204 | prefix, c->root_directory ? c->root_directory : "/", |
15ae422b | 3205 | prefix, yes_no(c->non_blocking), |
64747e2d | 3206 | prefix, yes_no(c->private_tmp), |
7f112f50 | 3207 | prefix, yes_no(c->private_devices), |
59eeb84b | 3208 | prefix, yes_no(c->protect_kernel_tunables), |
e66a2f65 | 3209 | prefix, yes_no(c->protect_kernel_modules), |
59eeb84b | 3210 | prefix, yes_no(c->protect_control_groups), |
d251207d LP |
3211 | prefix, yes_no(c->private_network), |
3212 | prefix, yes_no(c->private_users), | |
1b8689f9 LP |
3213 | prefix, protect_home_to_string(c->protect_home), |
3214 | prefix, protect_system_to_string(c->protect_system), | |
f3e43635 | 3215 | prefix, yes_no(c->ignore_sigpipe), |
f4170c67 LP |
3216 | prefix, yes_no(c->memory_deny_write_execute), |
3217 | prefix, yes_no(c->restrict_realtime)); | |
fb33a393 | 3218 | |
8c7be95e LP |
3219 | STRV_FOREACH(e, c->environment) |
3220 | fprintf(f, "%sEnvironment: %s\n", prefix, *e); | |
3221 | ||
3222 | STRV_FOREACH(e, c->environment_files) | |
3223 | fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e); | |
94f04347 | 3224 | |
b4c14404 FB |
3225 | STRV_FOREACH(e, c->pass_environment) |
3226 | fprintf(f, "%sPassEnvironment: %s\n", prefix, *e); | |
3227 | ||
c2bbd90b EV |
3228 | fprintf(f, "%sRuntimeDirectoryMode: %04o\n", prefix, c->runtime_directory_mode); |
3229 | ||
3230 | STRV_FOREACH(d, c->runtime_directory) | |
3231 | fprintf(f, "%sRuntimeDirectory: %s\n", prefix, *d); | |
3232 | ||
fb33a393 LP |
3233 | if (c->nice_set) |
3234 | fprintf(f, | |
3235 | "%sNice: %i\n", | |
3236 | prefix, c->nice); | |
3237 | ||
dd6c17b1 | 3238 | if (c->oom_score_adjust_set) |
fb33a393 | 3239 | fprintf(f, |
dd6c17b1 LP |
3240 | "%sOOMScoreAdjust: %i\n", |
3241 | prefix, c->oom_score_adjust); | |
9eba9da4 | 3242 | |
94f04347 | 3243 | for (i = 0; i < RLIM_NLIMITS; i++) |
3c11da9d EV |
3244 | if (c->rlimit[i]) { |
3245 | fprintf(f, "%s%s: " RLIM_FMT "\n", | |
3246 | prefix, rlimit_to_string(i), c->rlimit[i]->rlim_max); | |
3247 | fprintf(f, "%s%sSoft: " RLIM_FMT "\n", | |
3248 | prefix, rlimit_to_string(i), c->rlimit[i]->rlim_cur); | |
3249 | } | |
94f04347 | 3250 | |
f8b69d1d | 3251 | if (c->ioprio_set) { |
1756a011 | 3252 | _cleanup_free_ char *class_str = NULL; |
f8b69d1d | 3253 | |
1756a011 | 3254 | ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str); |
9eba9da4 LP |
3255 | fprintf(f, |
3256 | "%sIOSchedulingClass: %s\n" | |
3257 | "%sIOPriority: %i\n", | |
f8b69d1d | 3258 | prefix, strna(class_str), |
9eba9da4 | 3259 | prefix, (int) IOPRIO_PRIO_DATA(c->ioprio)); |
f8b69d1d | 3260 | } |
94f04347 | 3261 | |
f8b69d1d | 3262 | if (c->cpu_sched_set) { |
1756a011 | 3263 | _cleanup_free_ char *policy_str = NULL; |
f8b69d1d | 3264 | |
1756a011 | 3265 | sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str); |
94f04347 LP |
3266 | fprintf(f, |
3267 | "%sCPUSchedulingPolicy: %s\n" | |
38b48754 LP |
3268 | "%sCPUSchedulingPriority: %i\n" |
3269 | "%sCPUSchedulingResetOnFork: %s\n", | |
f8b69d1d | 3270 | prefix, strna(policy_str), |
38b48754 LP |
3271 | prefix, c->cpu_sched_priority, |
3272 | prefix, yes_no(c->cpu_sched_reset_on_fork)); | |
b929bf04 | 3273 | } |
94f04347 | 3274 | |
82c121a4 | 3275 | if (c->cpuset) { |
94f04347 | 3276 | fprintf(f, "%sCPUAffinity:", prefix); |
82c121a4 LP |
3277 | for (i = 0; i < c->cpuset_ncpus; i++) |
3278 | if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset)) | |
43a99a7a | 3279 | fprintf(f, " %u", i); |
94f04347 LP |
3280 | fputs("\n", f); |
3281 | } | |
3282 | ||
3a43da28 | 3283 | if (c->timer_slack_nsec != NSEC_INFINITY) |
ccd06097 | 3284 | fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec); |
94f04347 LP |
3285 | |
3286 | fprintf(f, | |
80876c20 LP |
3287 | "%sStandardInput: %s\n" |
3288 | "%sStandardOutput: %s\n" | |
3289 | "%sStandardError: %s\n", | |
3290 | prefix, exec_input_to_string(c->std_input), | |
3291 | prefix, exec_output_to_string(c->std_output), | |
3292 | prefix, exec_output_to_string(c->std_error)); | |
3293 | ||
3294 | if (c->tty_path) | |
3295 | fprintf(f, | |
6ea832a2 LP |
3296 | "%sTTYPath: %s\n" |
3297 | "%sTTYReset: %s\n" | |
3298 | "%sTTYVHangup: %s\n" | |
3299 | "%sTTYVTDisallocate: %s\n", | |
3300 | prefix, c->tty_path, | |
3301 | prefix, yes_no(c->tty_reset), | |
3302 | prefix, yes_no(c->tty_vhangup), | |
3303 | prefix, yes_no(c->tty_vt_disallocate)); | |
94f04347 | 3304 | |
5ce70e5b ZJS |
3305 | if (c->std_output == EXEC_OUTPUT_SYSLOG || |
3306 | c->std_output == EXEC_OUTPUT_KMSG || | |
3307 | c->std_output == EXEC_OUTPUT_JOURNAL || | |
3308 | c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
3309 | c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
3310 | c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE || | |
3311 | c->std_error == EXEC_OUTPUT_SYSLOG || | |
3312 | c->std_error == EXEC_OUTPUT_KMSG || | |
3313 | c->std_error == EXEC_OUTPUT_JOURNAL || | |
3314 | c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
3315 | c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
3316 | c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) { | |
f8b69d1d | 3317 | |
5ce70e5b | 3318 | _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL; |
f8b69d1d | 3319 | |
5ce70e5b ZJS |
3320 | log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str); |
3321 | log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str); | |
f8b69d1d | 3322 | |
94f04347 LP |
3323 | fprintf(f, |
3324 | "%sSyslogFacility: %s\n" | |
3325 | "%sSyslogLevel: %s\n", | |
f8b69d1d MS |
3326 | prefix, strna(fac_str), |
3327 | prefix, strna(lvl_str)); | |
f8b69d1d | 3328 | } |
94f04347 | 3329 | |
94f04347 LP |
3330 | if (c->secure_bits) |
3331 | fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n", | |
3332 | prefix, | |
cbb21cca ZJS |
3333 | (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "", |
3334 | (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "", | |
3335 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "", | |
3336 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "", | |
3337 | (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "", | |
3338 | (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : ""); | |
94f04347 | 3339 | |
a103496c | 3340 | if (c->capability_bounding_set != CAP_ALL) { |
ae556c21 | 3341 | unsigned long l; |
260abb78 | 3342 | fprintf(f, "%sCapabilityBoundingSet:", prefix); |
94f04347 | 3343 | |
64685e0c | 3344 | for (l = 0; l <= cap_last_cap(); l++) |
a103496c | 3345 | if (c->capability_bounding_set & (UINT64_C(1) << l)) |
2822da4f | 3346 | fprintf(f, " %s", strna(capability_to_name(l))); |
94f04347 LP |
3347 | |
3348 | fputs("\n", f); | |
755d4b67 IP |
3349 | } |
3350 | ||
3351 | if (c->capability_ambient_set != 0) { | |
3352 | unsigned long l; | |
3353 | fprintf(f, "%sAmbientCapabilities:", prefix); | |
3354 | ||
3355 | for (l = 0; l <= cap_last_cap(); l++) | |
3356 | if (c->capability_ambient_set & (UINT64_C(1) << l)) | |
3357 | fprintf(f, " %s", strna(capability_to_name(l))); | |
3358 | ||
3359 | fputs("\n", f); | |
94f04347 LP |
3360 | } |
3361 | ||
3362 | if (c->user) | |
f2d3769a | 3363 | fprintf(f, "%sUser: %s\n", prefix, c->user); |
94f04347 | 3364 | if (c->group) |
f2d3769a | 3365 | fprintf(f, "%sGroup: %s\n", prefix, c->group); |
94f04347 | 3366 | |
29206d46 LP |
3367 | fprintf(f, "%sDynamicUser: %s\n", prefix, yes_no(c->dynamic_user)); |
3368 | ||
15ae422b | 3369 | if (strv_length(c->supplementary_groups) > 0) { |
94f04347 | 3370 | fprintf(f, "%sSupplementaryGroups:", prefix); |
15ae422b LP |
3371 | strv_fprintf(f, c->supplementary_groups); |
3372 | fputs("\n", f); | |
3373 | } | |
94f04347 | 3374 | |
5b6319dc | 3375 | if (c->pam_name) |
f2d3769a | 3376 | fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name); |
5b6319dc | 3377 | |
2a624c36 AP |
3378 | if (strv_length(c->read_write_paths) > 0) { |
3379 | fprintf(f, "%sReadWritePaths:", prefix); | |
3380 | strv_fprintf(f, c->read_write_paths); | |
15ae422b LP |
3381 | fputs("\n", f); |
3382 | } | |
3383 | ||
2a624c36 AP |
3384 | if (strv_length(c->read_only_paths) > 0) { |
3385 | fprintf(f, "%sReadOnlyPaths:", prefix); | |
3386 | strv_fprintf(f, c->read_only_paths); | |
15ae422b LP |
3387 | fputs("\n", f); |
3388 | } | |
94f04347 | 3389 | |
2a624c36 AP |
3390 | if (strv_length(c->inaccessible_paths) > 0) { |
3391 | fprintf(f, "%sInaccessiblePaths:", prefix); | |
3392 | strv_fprintf(f, c->inaccessible_paths); | |
94f04347 LP |
3393 | fputs("\n", f); |
3394 | } | |
2e22afe9 | 3395 | |
169c1bda LP |
3396 | if (c->utmp_id) |
3397 | fprintf(f, | |
3398 | "%sUtmpIdentifier: %s\n", | |
3399 | prefix, c->utmp_id); | |
7b52a628 MS |
3400 | |
3401 | if (c->selinux_context) | |
3402 | fprintf(f, | |
5f8640fb LP |
3403 | "%sSELinuxContext: %s%s\n", |
3404 | prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context); | |
17df7223 | 3405 | |
050f7277 | 3406 | if (c->personality != PERSONALITY_INVALID) |
ac45f971 LP |
3407 | fprintf(f, |
3408 | "%sPersonality: %s\n", | |
3409 | prefix, strna(personality_to_string(c->personality))); | |
3410 | ||
17df7223 | 3411 | if (c->syscall_filter) { |
351a19b1 | 3412 | #ifdef HAVE_SECCOMP |
17df7223 LP |
3413 | Iterator j; |
3414 | void *id; | |
3415 | bool first = true; | |
351a19b1 | 3416 | #endif |
17df7223 LP |
3417 | |
3418 | fprintf(f, | |
57183d11 | 3419 | "%sSystemCallFilter: ", |
17df7223 LP |
3420 | prefix); |
3421 | ||
3422 | if (!c->syscall_whitelist) | |
3423 | fputc('~', f); | |
3424 | ||
351a19b1 | 3425 | #ifdef HAVE_SECCOMP |
17df7223 LP |
3426 | SET_FOREACH(id, c->syscall_filter, j) { |
3427 | _cleanup_free_ char *name = NULL; | |
3428 | ||
3429 | if (first) | |
3430 | first = false; | |
3431 | else | |
3432 | fputc(' ', f); | |
3433 | ||
57183d11 | 3434 | name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1); |
17df7223 LP |
3435 | fputs(strna(name), f); |
3436 | } | |
351a19b1 | 3437 | #endif |
17df7223 LP |
3438 | |
3439 | fputc('\n', f); | |
3440 | } | |
3441 | ||
57183d11 LP |
3442 | if (c->syscall_archs) { |
3443 | #ifdef HAVE_SECCOMP | |
3444 | Iterator j; | |
3445 | void *id; | |
3446 | #endif | |
3447 | ||
3448 | fprintf(f, | |
3449 | "%sSystemCallArchitectures:", | |
3450 | prefix); | |
3451 | ||
3452 | #ifdef HAVE_SECCOMP | |
3453 | SET_FOREACH(id, c->syscall_archs, j) | |
3454 | fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1))); | |
3455 | #endif | |
3456 | fputc('\n', f); | |
3457 | } | |
3458 | ||
b3267152 | 3459 | if (c->syscall_errno > 0) |
17df7223 LP |
3460 | fprintf(f, |
3461 | "%sSystemCallErrorNumber: %s\n", | |
3462 | prefix, strna(errno_to_name(c->syscall_errno))); | |
eef65bf3 MS |
3463 | |
3464 | if (c->apparmor_profile) | |
3465 | fprintf(f, | |
3466 | "%sAppArmorProfile: %s%s\n", | |
3467 | prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile); | |
5cb5a6ff LP |
3468 | } |
3469 | ||
a931ad47 LP |
3470 | bool exec_context_maintains_privileges(ExecContext *c) { |
3471 | assert(c); | |
3472 | ||
61233823 | 3473 | /* Returns true if the process forked off would run under |
a931ad47 LP |
3474 | * an unchanged UID or as root. */ |
3475 | ||
3476 | if (!c->user) | |
3477 | return true; | |
3478 | ||
3479 | if (streq(c->user, "root") || streq(c->user, "0")) | |
3480 | return true; | |
3481 | ||
3482 | return false; | |
3483 | } | |
3484 | ||
b58b4116 | 3485 | void exec_status_start(ExecStatus *s, pid_t pid) { |
034c6ed7 | 3486 | assert(s); |
5cb5a6ff | 3487 | |
b58b4116 LP |
3488 | zero(*s); |
3489 | s->pid = pid; | |
3490 | dual_timestamp_get(&s->start_timestamp); | |
3491 | } | |
3492 | ||
6ea832a2 | 3493 | void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) { |
b58b4116 LP |
3494 | assert(s); |
3495 | ||
0b1f4ae6 | 3496 | if (s->pid && s->pid != pid) |
b58b4116 LP |
3497 | zero(*s); |
3498 | ||
034c6ed7 | 3499 | s->pid = pid; |
63983207 | 3500 | dual_timestamp_get(&s->exit_timestamp); |
9fb86720 | 3501 | |
034c6ed7 LP |
3502 | s->code = code; |
3503 | s->status = status; | |
169c1bda | 3504 | |
6ea832a2 LP |
3505 | if (context) { |
3506 | if (context->utmp_id) | |
3507 | utmp_put_dead_process(context->utmp_id, pid, code, status); | |
3508 | ||
1e22b5cd | 3509 | exec_context_tty_reset(context, NULL); |
6ea832a2 | 3510 | } |
9fb86720 LP |
3511 | } |
3512 | ||
3513 | void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) { | |
3514 | char buf[FORMAT_TIMESTAMP_MAX]; | |
3515 | ||
3516 | assert(s); | |
3517 | assert(f); | |
3518 | ||
9fb86720 LP |
3519 | if (s->pid <= 0) |
3520 | return; | |
3521 | ||
4c940960 LP |
3522 | prefix = strempty(prefix); |
3523 | ||
9fb86720 | 3524 | fprintf(f, |
ccd06097 ZJS |
3525 | "%sPID: "PID_FMT"\n", |
3526 | prefix, s->pid); | |
9fb86720 | 3527 | |
af9d16e1 | 3528 | if (dual_timestamp_is_set(&s->start_timestamp)) |
9fb86720 LP |
3529 | fprintf(f, |
3530 | "%sStart Timestamp: %s\n", | |
63983207 | 3531 | prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime)); |
9fb86720 | 3532 | |
af9d16e1 | 3533 | if (dual_timestamp_is_set(&s->exit_timestamp)) |
9fb86720 LP |
3534 | fprintf(f, |
3535 | "%sExit Timestamp: %s\n" | |
3536 | "%sExit Code: %s\n" | |
3537 | "%sExit Status: %i\n", | |
63983207 | 3538 | prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime), |
9fb86720 LP |
3539 | prefix, sigchld_code_to_string(s->code), |
3540 | prefix, s->status); | |
5cb5a6ff | 3541 | } |
44d8db9e | 3542 | |
9e2f7c11 | 3543 | char *exec_command_line(char **argv) { |
44d8db9e LP |
3544 | size_t k; |
3545 | char *n, *p, **a; | |
3546 | bool first = true; | |
3547 | ||
9e2f7c11 | 3548 | assert(argv); |
44d8db9e | 3549 | |
9164977d | 3550 | k = 1; |
9e2f7c11 | 3551 | STRV_FOREACH(a, argv) |
44d8db9e LP |
3552 | k += strlen(*a)+3; |
3553 | ||
3554 | if (!(n = new(char, k))) | |
3555 | return NULL; | |
3556 | ||
3557 | p = n; | |
9e2f7c11 | 3558 | STRV_FOREACH(a, argv) { |
44d8db9e LP |
3559 | |
3560 | if (!first) | |
3561 | *(p++) = ' '; | |
3562 | else | |
3563 | first = false; | |
3564 | ||
3565 | if (strpbrk(*a, WHITESPACE)) { | |
3566 | *(p++) = '\''; | |
3567 | p = stpcpy(p, *a); | |
3568 | *(p++) = '\''; | |
3569 | } else | |
3570 | p = stpcpy(p, *a); | |
3571 | ||
3572 | } | |
3573 | ||
9164977d LP |
3574 | *p = 0; |
3575 | ||
44d8db9e LP |
3576 | /* FIXME: this doesn't really handle arguments that have |
3577 | * spaces and ticks in them */ | |
3578 | ||
3579 | return n; | |
3580 | } | |
3581 | ||
3582 | void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) { | |
e1d75803 | 3583 | _cleanup_free_ char *cmd = NULL; |
4c940960 | 3584 | const char *prefix2; |
44d8db9e LP |
3585 | |
3586 | assert(c); | |
3587 | assert(f); | |
3588 | ||
4c940960 | 3589 | prefix = strempty(prefix); |
63c372cb | 3590 | prefix2 = strjoina(prefix, "\t"); |
44d8db9e | 3591 | |
9e2f7c11 | 3592 | cmd = exec_command_line(c->argv); |
44d8db9e LP |
3593 | fprintf(f, |
3594 | "%sCommand Line: %s\n", | |
3595 | prefix, cmd ? cmd : strerror(ENOMEM)); | |
3596 | ||
9fb86720 | 3597 | exec_status_dump(&c->exec_status, f, prefix2); |
44d8db9e LP |
3598 | } |
3599 | ||
3600 | void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) { | |
3601 | assert(f); | |
3602 | ||
4c940960 | 3603 | prefix = strempty(prefix); |
44d8db9e LP |
3604 | |
3605 | LIST_FOREACH(command, c, c) | |
3606 | exec_command_dump(c, f, prefix); | |
3607 | } | |
94f04347 | 3608 | |
a6a80b4f LP |
3609 | void exec_command_append_list(ExecCommand **l, ExecCommand *e) { |
3610 | ExecCommand *end; | |
3611 | ||
3612 | assert(l); | |
3613 | assert(e); | |
3614 | ||
3615 | if (*l) { | |
35b8ca3a | 3616 | /* It's kind of important, that we keep the order here */ |
71fda00f LP |
3617 | LIST_FIND_TAIL(command, *l, end); |
3618 | LIST_INSERT_AFTER(command, *l, end, e); | |
a6a80b4f LP |
3619 | } else |
3620 | *l = e; | |
3621 | } | |
3622 | ||
26fd040d LP |
3623 | int exec_command_set(ExecCommand *c, const char *path, ...) { |
3624 | va_list ap; | |
3625 | char **l, *p; | |
3626 | ||
3627 | assert(c); | |
3628 | assert(path); | |
3629 | ||
3630 | va_start(ap, path); | |
3631 | l = strv_new_ap(path, ap); | |
3632 | va_end(ap); | |
3633 | ||
3634 | if (!l) | |
3635 | return -ENOMEM; | |
3636 | ||
250a918d LP |
3637 | p = strdup(path); |
3638 | if (!p) { | |
26fd040d LP |
3639 | strv_free(l); |
3640 | return -ENOMEM; | |
3641 | } | |
3642 | ||
3643 | free(c->path); | |
3644 | c->path = p; | |
3645 | ||
3646 | strv_free(c->argv); | |
3647 | c->argv = l; | |
3648 | ||
3649 | return 0; | |
3650 | } | |
3651 | ||
86b23b07 | 3652 | int exec_command_append(ExecCommand *c, const char *path, ...) { |
e63ff941 | 3653 | _cleanup_strv_free_ char **l = NULL; |
86b23b07 | 3654 | va_list ap; |
86b23b07 JS |
3655 | int r; |
3656 | ||
3657 | assert(c); | |
3658 | assert(path); | |
3659 | ||
3660 | va_start(ap, path); | |
3661 | l = strv_new_ap(path, ap); | |
3662 | va_end(ap); | |
3663 | ||
3664 | if (!l) | |
3665 | return -ENOMEM; | |
3666 | ||
e287086b | 3667 | r = strv_extend_strv(&c->argv, l, false); |
e63ff941 | 3668 | if (r < 0) |
86b23b07 | 3669 | return r; |
86b23b07 JS |
3670 | |
3671 | return 0; | |
3672 | } | |
3673 | ||
3674 | ||
613b411c LP |
3675 | static int exec_runtime_allocate(ExecRuntime **rt) { |
3676 | ||
3677 | if (*rt) | |
3678 | return 0; | |
3679 | ||
3680 | *rt = new0(ExecRuntime, 1); | |
f146f5e1 | 3681 | if (!*rt) |
613b411c LP |
3682 | return -ENOMEM; |
3683 | ||
3684 | (*rt)->n_ref = 1; | |
3685 | (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1; | |
3686 | ||
3687 | return 0; | |
3688 | } | |
3689 | ||
3690 | int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) { | |
3691 | int r; | |
3692 | ||
3693 | assert(rt); | |
3694 | assert(c); | |
3695 | assert(id); | |
3696 | ||
3697 | if (*rt) | |
3698 | return 1; | |
3699 | ||
3700 | if (!c->private_network && !c->private_tmp) | |
3701 | return 0; | |
3702 | ||
3703 | r = exec_runtime_allocate(rt); | |
3704 | if (r < 0) | |
3705 | return r; | |
3706 | ||
3707 | if (c->private_network && (*rt)->netns_storage_socket[0] < 0) { | |
33df919d | 3708 | if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, (*rt)->netns_storage_socket) < 0) |
613b411c LP |
3709 | return -errno; |
3710 | } | |
3711 | ||
3712 | if (c->private_tmp && !(*rt)->tmp_dir) { | |
3713 | r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir); | |
3714 | if (r < 0) | |
3715 | return r; | |
3716 | } | |
3717 | ||
3718 | return 1; | |
3719 | } | |
3720 | ||
3721 | ExecRuntime *exec_runtime_ref(ExecRuntime *r) { | |
3722 | assert(r); | |
3723 | assert(r->n_ref > 0); | |
3724 | ||
3725 | r->n_ref++; | |
3726 | return r; | |
3727 | } | |
3728 | ||
3729 | ExecRuntime *exec_runtime_unref(ExecRuntime *r) { | |
3730 | ||
3731 | if (!r) | |
3732 | return NULL; | |
3733 | ||
3734 | assert(r->n_ref > 0); | |
3735 | ||
3736 | r->n_ref--; | |
f2341e0a LP |
3737 | if (r->n_ref > 0) |
3738 | return NULL; | |
3739 | ||
3740 | free(r->tmp_dir); | |
3741 | free(r->var_tmp_dir); | |
3742 | safe_close_pair(r->netns_storage_socket); | |
6b430fdb | 3743 | return mfree(r); |
613b411c LP |
3744 | } |
3745 | ||
f2341e0a | 3746 | int exec_runtime_serialize(Unit *u, ExecRuntime *rt, FILE *f, FDSet *fds) { |
613b411c LP |
3747 | assert(u); |
3748 | assert(f); | |
3749 | assert(fds); | |
3750 | ||
3751 | if (!rt) | |
3752 | return 0; | |
3753 | ||
3754 | if (rt->tmp_dir) | |
3755 | unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir); | |
3756 | ||
3757 | if (rt->var_tmp_dir) | |
3758 | unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir); | |
3759 | ||
3760 | if (rt->netns_storage_socket[0] >= 0) { | |
3761 | int copy; | |
3762 | ||
3763 | copy = fdset_put_dup(fds, rt->netns_storage_socket[0]); | |
3764 | if (copy < 0) | |
3765 | return copy; | |
3766 | ||
3767 | unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy); | |
3768 | } | |
3769 | ||
3770 | if (rt->netns_storage_socket[1] >= 0) { | |
3771 | int copy; | |
3772 | ||
3773 | copy = fdset_put_dup(fds, rt->netns_storage_socket[1]); | |
3774 | if (copy < 0) | |
3775 | return copy; | |
3776 | ||
3777 | unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy); | |
3778 | } | |
3779 | ||
3780 | return 0; | |
3781 | } | |
3782 | ||
f2341e0a | 3783 | int exec_runtime_deserialize_item(Unit *u, ExecRuntime **rt, const char *key, const char *value, FDSet *fds) { |
613b411c LP |
3784 | int r; |
3785 | ||
3786 | assert(rt); | |
3787 | assert(key); | |
3788 | assert(value); | |
3789 | ||
3790 | if (streq(key, "tmp-dir")) { | |
3791 | char *copy; | |
3792 | ||
3793 | r = exec_runtime_allocate(rt); | |
3794 | if (r < 0) | |
f2341e0a | 3795 | return log_oom(); |
613b411c LP |
3796 | |
3797 | copy = strdup(value); | |
3798 | if (!copy) | |
3799 | return log_oom(); | |
3800 | ||
3801 | free((*rt)->tmp_dir); | |
3802 | (*rt)->tmp_dir = copy; | |
3803 | ||
3804 | } else if (streq(key, "var-tmp-dir")) { | |
3805 | char *copy; | |
3806 | ||
3807 | r = exec_runtime_allocate(rt); | |
3808 | if (r < 0) | |
f2341e0a | 3809 | return log_oom(); |
613b411c LP |
3810 | |
3811 | copy = strdup(value); | |
3812 | if (!copy) | |
3813 | return log_oom(); | |
3814 | ||
3815 | free((*rt)->var_tmp_dir); | |
3816 | (*rt)->var_tmp_dir = copy; | |
3817 | ||
3818 | } else if (streq(key, "netns-socket-0")) { | |
3819 | int fd; | |
3820 | ||
3821 | r = exec_runtime_allocate(rt); | |
3822 | if (r < 0) | |
f2341e0a | 3823 | return log_oom(); |
613b411c LP |
3824 | |
3825 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 3826 | log_unit_debug(u, "Failed to parse netns socket value: %s", value); |
613b411c | 3827 | else { |
03e334a1 | 3828 | safe_close((*rt)->netns_storage_socket[0]); |
613b411c LP |
3829 | (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd); |
3830 | } | |
3831 | } else if (streq(key, "netns-socket-1")) { | |
3832 | int fd; | |
3833 | ||
3834 | r = exec_runtime_allocate(rt); | |
3835 | if (r < 0) | |
f2341e0a | 3836 | return log_oom(); |
613b411c LP |
3837 | |
3838 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 3839 | log_unit_debug(u, "Failed to parse netns socket value: %s", value); |
613b411c | 3840 | else { |
03e334a1 | 3841 | safe_close((*rt)->netns_storage_socket[1]); |
613b411c LP |
3842 | (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd); |
3843 | } | |
3844 | } else | |
3845 | return 0; | |
3846 | ||
3847 | return 1; | |
3848 | } | |
3849 | ||
3850 | static void *remove_tmpdir_thread(void *p) { | |
3851 | _cleanup_free_ char *path = p; | |
3852 | ||
c6878637 | 3853 | (void) rm_rf(path, REMOVE_ROOT|REMOVE_PHYSICAL); |
613b411c LP |
3854 | return NULL; |
3855 | } | |
3856 | ||
3857 | void exec_runtime_destroy(ExecRuntime *rt) { | |
98b47d54 LP |
3858 | int r; |
3859 | ||
613b411c LP |
3860 | if (!rt) |
3861 | return; | |
3862 | ||
3863 | /* If there are multiple users of this, let's leave the stuff around */ | |
3864 | if (rt->n_ref > 1) | |
3865 | return; | |
3866 | ||
3867 | if (rt->tmp_dir) { | |
3868 | log_debug("Spawning thread to nuke %s", rt->tmp_dir); | |
98b47d54 LP |
3869 | |
3870 | r = asynchronous_job(remove_tmpdir_thread, rt->tmp_dir); | |
3871 | if (r < 0) { | |
da927ba9 | 3872 | log_warning_errno(r, "Failed to nuke %s: %m", rt->tmp_dir); |
98b47d54 LP |
3873 | free(rt->tmp_dir); |
3874 | } | |
3875 | ||
613b411c LP |
3876 | rt->tmp_dir = NULL; |
3877 | } | |
3878 | ||
3879 | if (rt->var_tmp_dir) { | |
3880 | log_debug("Spawning thread to nuke %s", rt->var_tmp_dir); | |
98b47d54 LP |
3881 | |
3882 | r = asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir); | |
3883 | if (r < 0) { | |
da927ba9 | 3884 | log_warning_errno(r, "Failed to nuke %s: %m", rt->var_tmp_dir); |
98b47d54 LP |
3885 | free(rt->var_tmp_dir); |
3886 | } | |
3887 | ||
613b411c LP |
3888 | rt->var_tmp_dir = NULL; |
3889 | } | |
3890 | ||
3d94f76c | 3891 | safe_close_pair(rt->netns_storage_socket); |
613b411c LP |
3892 | } |
3893 | ||
80876c20 LP |
3894 | static const char* const exec_input_table[_EXEC_INPUT_MAX] = { |
3895 | [EXEC_INPUT_NULL] = "null", | |
3896 | [EXEC_INPUT_TTY] = "tty", | |
3897 | [EXEC_INPUT_TTY_FORCE] = "tty-force", | |
4f2d528d LP |
3898 | [EXEC_INPUT_TTY_FAIL] = "tty-fail", |
3899 | [EXEC_INPUT_SOCKET] = "socket" | |
80876c20 LP |
3900 | }; |
3901 | ||
8a0867d6 LP |
3902 | DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput); |
3903 | ||
94f04347 | 3904 | static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = { |
80876c20 | 3905 | [EXEC_OUTPUT_INHERIT] = "inherit", |
94f04347 | 3906 | [EXEC_OUTPUT_NULL] = "null", |
80876c20 | 3907 | [EXEC_OUTPUT_TTY] = "tty", |
94f04347 | 3908 | [EXEC_OUTPUT_SYSLOG] = "syslog", |
28dbc1e8 | 3909 | [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console", |
9a6bca7a | 3910 | [EXEC_OUTPUT_KMSG] = "kmsg", |
28dbc1e8 | 3911 | [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console", |
706343f4 LP |
3912 | [EXEC_OUTPUT_JOURNAL] = "journal", |
3913 | [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console", | |
4f2d528d | 3914 | [EXEC_OUTPUT_SOCKET] = "socket" |
94f04347 LP |
3915 | }; |
3916 | ||
3917 | DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput); | |
023a4f67 LP |
3918 | |
3919 | static const char* const exec_utmp_mode_table[_EXEC_UTMP_MODE_MAX] = { | |
3920 | [EXEC_UTMP_INIT] = "init", | |
3921 | [EXEC_UTMP_LOGIN] = "login", | |
3922 | [EXEC_UTMP_USER] = "user", | |
3923 | }; | |
3924 | ||
3925 | DEFINE_STRING_TABLE_LOOKUP(exec_utmp_mode, ExecUtmpMode); |