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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
5cb5a6ff | 2 | |
a7334b09 LP |
3 | /*** |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
a7334b09 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
a7334b09 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
a7334b09 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
034c6ed7 LP |
22 | #include <errno.h> |
23 | #include <fcntl.h> | |
8dd4c05b LP |
24 | #include <glob.h> |
25 | #include <grp.h> | |
26 | #include <poll.h> | |
309bff19 | 27 | #include <signal.h> |
8dd4c05b LP |
28 | #include <string.h> |
29 | #include <sys/personality.h> | |
94f04347 | 30 | #include <sys/prctl.h> |
8dd4c05b | 31 | #include <sys/socket.h> |
451a074f | 32 | #include <sys/stat.h> |
8dd4c05b LP |
33 | #include <sys/un.h> |
34 | #include <unistd.h> | |
023a4f67 | 35 | #include <utmpx.h> |
5cb5a6ff | 36 | |
5b6319dc LP |
37 | #ifdef HAVE_PAM |
38 | #include <security/pam_appl.h> | |
39 | #endif | |
40 | ||
7b52a628 MS |
41 | #ifdef HAVE_SELINUX |
42 | #include <selinux/selinux.h> | |
43 | #endif | |
44 | ||
17df7223 LP |
45 | #ifdef HAVE_SECCOMP |
46 | #include <seccomp.h> | |
47 | #endif | |
48 | ||
eef65bf3 MS |
49 | #ifdef HAVE_APPARMOR |
50 | #include <sys/apparmor.h> | |
51 | #endif | |
52 | ||
24882e06 | 53 | #include "sd-messages.h" |
8dd4c05b LP |
54 | |
55 | #include "af-list.h" | |
3ffd4af2 LP |
56 | #ifdef HAVE_APPARMOR |
57 | #include "apparmor-util.h" | |
58 | #endif | |
8dd4c05b LP |
59 | #include "async.h" |
60 | #include "barrier.h" | |
61 | #include "bus-endpoint.h" | |
62 | #include "cap-list.h" | |
d7832d2c | 63 | #include "capability.h" |
f6a6225e | 64 | #include "def.h" |
4d1a6904 | 65 | #include "env-util.h" |
17df7223 | 66 | #include "errno-list.h" |
3ffd4af2 | 67 | #include "execute.h" |
8dd4c05b | 68 | #include "exit-status.h" |
3ffd4af2 | 69 | #include "fd-util.h" |
8dd4c05b | 70 | #include "fileio.h" |
6482f626 | 71 | #include "formats-util.h" |
f4f15635 | 72 | #include "fs-util.h" |
c004493c | 73 | #include "io-util.h" |
8dd4c05b LP |
74 | #include "ioprio.h" |
75 | #include "log.h" | |
76 | #include "macro.h" | |
77 | #include "missing.h" | |
78 | #include "mkdir.h" | |
79 | #include "namespace.h" | |
6bedfcbb | 80 | #include "parse-util.h" |
8dd4c05b | 81 | #include "path-util.h" |
0b452006 | 82 | #include "process-util.h" |
78f22b97 | 83 | #include "rlimit-util.h" |
8dd4c05b | 84 | #include "rm-rf.h" |
3ffd4af2 LP |
85 | #ifdef HAVE_SECCOMP |
86 | #include "seccomp-util.h" | |
87 | #endif | |
8dd4c05b LP |
88 | #include "securebits.h" |
89 | #include "selinux-util.h" | |
24882e06 | 90 | #include "signal-util.h" |
8dd4c05b | 91 | #include "smack-util.h" |
07630cea | 92 | #include "string-util.h" |
8dd4c05b LP |
93 | #include "strv.h" |
94 | #include "terminal-util.h" | |
95 | #include "unit.h" | |
b1d4f8e1 | 96 | #include "user-util.h" |
8dd4c05b LP |
97 | #include "util.h" |
98 | #include "utmp-wtmp.h" | |
5cb5a6ff | 99 | |
e056b01d | 100 | #define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC) |
31a7eb86 | 101 | #define IDLE_TIMEOUT2_USEC (1*USEC_PER_SEC) |
e6a26745 | 102 | |
02a51aba LP |
103 | /* This assumes there is a 'tty' group */ |
104 | #define TTY_MODE 0620 | |
105 | ||
531dca78 LP |
106 | #define SNDBUF_SIZE (8*1024*1024) |
107 | ||
034c6ed7 LP |
108 | static int shift_fds(int fds[], unsigned n_fds) { |
109 | int start, restart_from; | |
110 | ||
111 | if (n_fds <= 0) | |
112 | return 0; | |
113 | ||
a0d40ac5 LP |
114 | /* Modifies the fds array! (sorts it) */ |
115 | ||
034c6ed7 LP |
116 | assert(fds); |
117 | ||
118 | start = 0; | |
119 | for (;;) { | |
120 | int i; | |
121 | ||
122 | restart_from = -1; | |
123 | ||
124 | for (i = start; i < (int) n_fds; i++) { | |
125 | int nfd; | |
126 | ||
127 | /* Already at right index? */ | |
128 | if (fds[i] == i+3) | |
129 | continue; | |
130 | ||
3cc2aff1 LP |
131 | nfd = fcntl(fds[i], F_DUPFD, i + 3); |
132 | if (nfd < 0) | |
034c6ed7 LP |
133 | return -errno; |
134 | ||
03e334a1 | 135 | safe_close(fds[i]); |
034c6ed7 LP |
136 | fds[i] = nfd; |
137 | ||
138 | /* Hmm, the fd we wanted isn't free? Then | |
ee33e53a | 139 | * let's remember that and try again from here */ |
034c6ed7 LP |
140 | if (nfd != i+3 && restart_from < 0) |
141 | restart_from = i; | |
142 | } | |
143 | ||
144 | if (restart_from < 0) | |
145 | break; | |
146 | ||
147 | start = restart_from; | |
148 | } | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
c2748801 | 153 | static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) { |
47a71eed | 154 | unsigned i; |
e2c76839 | 155 | int r; |
47a71eed LP |
156 | |
157 | if (n_fds <= 0) | |
158 | return 0; | |
159 | ||
160 | assert(fds); | |
161 | ||
451a074f | 162 | /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */ |
47a71eed LP |
163 | |
164 | for (i = 0; i < n_fds; i++) { | |
47a71eed | 165 | |
3cc2aff1 LP |
166 | r = fd_nonblock(fds[i], nonblock); |
167 | if (r < 0) | |
e2c76839 | 168 | return r; |
47a71eed | 169 | |
451a074f LP |
170 | /* We unconditionally drop FD_CLOEXEC from the fds, |
171 | * since after all we want to pass these fds to our | |
172 | * children */ | |
47a71eed | 173 | |
3cc2aff1 LP |
174 | r = fd_cloexec(fds[i], false); |
175 | if (r < 0) | |
e2c76839 | 176 | return r; |
47a71eed LP |
177 | } |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
44a6b1b6 | 182 | _pure_ static const char *tty_path(const ExecContext *context) { |
80876c20 LP |
183 | assert(context); |
184 | ||
185 | if (context->tty_path) | |
186 | return context->tty_path; | |
187 | ||
188 | return "/dev/console"; | |
189 | } | |
190 | ||
9588bc32 | 191 | static void exec_context_tty_reset(const ExecContext *context) { |
6ea832a2 LP |
192 | assert(context); |
193 | ||
194 | if (context->tty_vhangup) | |
195 | terminal_vhangup(tty_path(context)); | |
196 | ||
197 | if (context->tty_reset) | |
198 | reset_terminal(tty_path(context)); | |
199 | ||
200 | if (context->tty_vt_disallocate && context->tty_path) | |
201 | vt_disallocate(context->tty_path); | |
202 | } | |
203 | ||
3a1286b6 MS |
204 | static bool is_terminal_output(ExecOutput o) { |
205 | return | |
206 | o == EXEC_OUTPUT_TTY || | |
207 | o == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
208 | o == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
209 | o == EXEC_OUTPUT_JOURNAL_AND_CONSOLE; | |
210 | } | |
211 | ||
80876c20 LP |
212 | static int open_null_as(int flags, int nfd) { |
213 | int fd, r; | |
071830ff | 214 | |
80876c20 | 215 | assert(nfd >= 0); |
071830ff | 216 | |
613b411c LP |
217 | fd = open("/dev/null", flags|O_NOCTTY); |
218 | if (fd < 0) | |
071830ff LP |
219 | return -errno; |
220 | ||
80876c20 LP |
221 | if (fd != nfd) { |
222 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 223 | safe_close(fd); |
80876c20 LP |
224 | } else |
225 | r = nfd; | |
071830ff | 226 | |
80876c20 | 227 | return r; |
071830ff LP |
228 | } |
229 | ||
524daa8c | 230 | static int connect_journal_socket(int fd, uid_t uid, gid_t gid) { |
b92bea5d ZJS |
231 | union sockaddr_union sa = { |
232 | .un.sun_family = AF_UNIX, | |
233 | .un.sun_path = "/run/systemd/journal/stdout", | |
234 | }; | |
524daa8c ZJS |
235 | uid_t olduid = UID_INVALID; |
236 | gid_t oldgid = GID_INVALID; | |
237 | int r; | |
238 | ||
239 | if (gid != GID_INVALID) { | |
240 | oldgid = getgid(); | |
241 | ||
242 | r = setegid(gid); | |
243 | if (r < 0) | |
244 | return -errno; | |
245 | } | |
246 | ||
247 | if (uid != UID_INVALID) { | |
248 | olduid = getuid(); | |
249 | ||
250 | r = seteuid(uid); | |
251 | if (r < 0) { | |
252 | r = -errno; | |
253 | goto restore_gid; | |
254 | } | |
255 | } | |
256 | ||
257 | r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)); | |
258 | if (r < 0) | |
259 | r = -errno; | |
260 | ||
261 | /* If we fail to restore the uid or gid, things will likely | |
262 | fail later on. This should only happen if an LSM interferes. */ | |
263 | ||
264 | if (uid != UID_INVALID) | |
265 | (void) seteuid(olduid); | |
266 | ||
267 | restore_gid: | |
268 | if (gid != GID_INVALID) | |
269 | (void) setegid(oldgid); | |
270 | ||
271 | return r; | |
272 | } | |
273 | ||
274 | static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, const char *unit_id, int nfd, uid_t uid, gid_t gid) { | |
275 | int fd, r; | |
071830ff LP |
276 | |
277 | assert(context); | |
80876c20 LP |
278 | assert(output < _EXEC_OUTPUT_MAX); |
279 | assert(ident); | |
280 | assert(nfd >= 0); | |
071830ff | 281 | |
54fe0cdb LP |
282 | fd = socket(AF_UNIX, SOCK_STREAM, 0); |
283 | if (fd < 0) | |
80876c20 | 284 | return -errno; |
071830ff | 285 | |
524daa8c ZJS |
286 | r = connect_journal_socket(fd, uid, gid); |
287 | if (r < 0) | |
288 | return r; | |
071830ff | 289 | |
80876c20 | 290 | if (shutdown(fd, SHUT_RD) < 0) { |
03e334a1 | 291 | safe_close(fd); |
80876c20 LP |
292 | return -errno; |
293 | } | |
071830ff | 294 | |
531dca78 LP |
295 | fd_inc_sndbuf(fd, SNDBUF_SIZE); |
296 | ||
80876c20 | 297 | dprintf(fd, |
62bca2c6 | 298 | "%s\n" |
80876c20 LP |
299 | "%s\n" |
300 | "%i\n" | |
54fe0cdb LP |
301 | "%i\n" |
302 | "%i\n" | |
303 | "%i\n" | |
4f4a1dbf | 304 | "%i\n", |
4f4a1dbf | 305 | context->syslog_identifier ? context->syslog_identifier : ident, |
62bca2c6 | 306 | unit_id, |
54fe0cdb LP |
307 | context->syslog_priority, |
308 | !!context->syslog_level_prefix, | |
309 | output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE, | |
310 | output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE, | |
3a1286b6 | 311 | is_terminal_output(output)); |
80876c20 LP |
312 | |
313 | if (fd != nfd) { | |
314 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 315 | safe_close(fd); |
80876c20 LP |
316 | } else |
317 | r = nfd; | |
071830ff | 318 | |
80876c20 LP |
319 | return r; |
320 | } | |
321 | static int open_terminal_as(const char *path, mode_t mode, int nfd) { | |
322 | int fd, r; | |
071830ff | 323 | |
80876c20 LP |
324 | assert(path); |
325 | assert(nfd >= 0); | |
071830ff | 326 | |
3cc2aff1 LP |
327 | fd = open_terminal(path, mode | O_NOCTTY); |
328 | if (fd < 0) | |
80876c20 | 329 | return fd; |
071830ff | 330 | |
80876c20 LP |
331 | if (fd != nfd) { |
332 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 333 | safe_close(fd); |
80876c20 LP |
334 | } else |
335 | r = nfd; | |
071830ff | 336 | |
80876c20 LP |
337 | return r; |
338 | } | |
071830ff | 339 | |
80876c20 LP |
340 | static bool is_terminal_input(ExecInput i) { |
341 | return | |
342 | i == EXEC_INPUT_TTY || | |
343 | i == EXEC_INPUT_TTY_FORCE || | |
344 | i == EXEC_INPUT_TTY_FAIL; | |
345 | } | |
071830ff | 346 | |
1e3ad081 LP |
347 | static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) { |
348 | ||
349 | if (is_terminal_input(std_input) && !apply_tty_stdin) | |
350 | return EXEC_INPUT_NULL; | |
071830ff | 351 | |
03fd9c49 | 352 | if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0) |
4f2d528d LP |
353 | return EXEC_INPUT_NULL; |
354 | ||
03fd9c49 | 355 | return std_input; |
4f2d528d LP |
356 | } |
357 | ||
03fd9c49 | 358 | static int fixup_output(ExecOutput std_output, int socket_fd) { |
4f2d528d | 359 | |
03fd9c49 | 360 | if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0) |
4f2d528d LP |
361 | return EXEC_OUTPUT_INHERIT; |
362 | ||
03fd9c49 | 363 | return std_output; |
4f2d528d LP |
364 | } |
365 | ||
a34ceba6 LP |
366 | static int setup_input( |
367 | const ExecContext *context, | |
368 | const ExecParameters *params, | |
369 | int socket_fd) { | |
370 | ||
4f2d528d LP |
371 | ExecInput i; |
372 | ||
373 | assert(context); | |
a34ceba6 LP |
374 | assert(params); |
375 | ||
376 | if (params->stdin_fd >= 0) { | |
377 | if (dup2(params->stdin_fd, STDIN_FILENO) < 0) | |
378 | return -errno; | |
379 | ||
380 | /* Try to make this the controlling tty, if it is a tty, and reset it */ | |
381 | (void) ioctl(STDIN_FILENO, TIOCSCTTY, context->std_input == EXEC_INPUT_TTY_FORCE); | |
382 | (void) reset_terminal_fd(STDIN_FILENO, true); | |
383 | ||
384 | return STDIN_FILENO; | |
385 | } | |
4f2d528d | 386 | |
a34ceba6 | 387 | i = fixup_input(context->std_input, socket_fd, params->apply_tty_stdin); |
4f2d528d LP |
388 | |
389 | switch (i) { | |
071830ff | 390 | |
80876c20 LP |
391 | case EXEC_INPUT_NULL: |
392 | return open_null_as(O_RDONLY, STDIN_FILENO); | |
393 | ||
394 | case EXEC_INPUT_TTY: | |
395 | case EXEC_INPUT_TTY_FORCE: | |
396 | case EXEC_INPUT_TTY_FAIL: { | |
397 | int fd, r; | |
071830ff | 398 | |
970edce6 ZJS |
399 | fd = acquire_terminal(tty_path(context), |
400 | i == EXEC_INPUT_TTY_FAIL, | |
401 | i == EXEC_INPUT_TTY_FORCE, | |
402 | false, | |
3a43da28 | 403 | USEC_INFINITY); |
970edce6 | 404 | if (fd < 0) |
80876c20 LP |
405 | return fd; |
406 | ||
407 | if (fd != STDIN_FILENO) { | |
408 | r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
03e334a1 | 409 | safe_close(fd); |
80876c20 LP |
410 | } else |
411 | r = STDIN_FILENO; | |
412 | ||
413 | return r; | |
414 | } | |
415 | ||
4f2d528d LP |
416 | case EXEC_INPUT_SOCKET: |
417 | return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
418 | ||
80876c20 LP |
419 | default: |
420 | assert_not_reached("Unknown input type"); | |
421 | } | |
422 | } | |
423 | ||
a34ceba6 LP |
424 | static int setup_output( |
425 | Unit *unit, | |
426 | const ExecContext *context, | |
427 | const ExecParameters *params, | |
428 | int fileno, | |
429 | int socket_fd, | |
430 | const char *ident, | |
431 | uid_t uid, gid_t gid) { | |
432 | ||
4f2d528d LP |
433 | ExecOutput o; |
434 | ExecInput i; | |
47c1d80d | 435 | int r; |
4f2d528d | 436 | |
f2341e0a | 437 | assert(unit); |
80876c20 | 438 | assert(context); |
a34ceba6 | 439 | assert(params); |
80876c20 LP |
440 | assert(ident); |
441 | ||
a34ceba6 LP |
442 | if (fileno == STDOUT_FILENO && params->stdout_fd >= 0) { |
443 | ||
444 | if (dup2(params->stdout_fd, STDOUT_FILENO) < 0) | |
445 | return -errno; | |
446 | ||
447 | return STDOUT_FILENO; | |
448 | } | |
449 | ||
450 | if (fileno == STDERR_FILENO && params->stderr_fd >= 0) { | |
451 | if (dup2(params->stderr_fd, STDERR_FILENO) < 0) | |
452 | return -errno; | |
453 | ||
454 | return STDERR_FILENO; | |
455 | } | |
456 | ||
457 | i = fixup_input(context->std_input, socket_fd, params->apply_tty_stdin); | |
03fd9c49 | 458 | o = fixup_output(context->std_output, socket_fd); |
4f2d528d | 459 | |
eb17e935 MS |
460 | if (fileno == STDERR_FILENO) { |
461 | ExecOutput e; | |
462 | e = fixup_output(context->std_error, socket_fd); | |
80876c20 | 463 | |
eb17e935 MS |
464 | /* This expects the input and output are already set up */ |
465 | ||
466 | /* Don't change the stderr file descriptor if we inherit all | |
467 | * the way and are not on a tty */ | |
468 | if (e == EXEC_OUTPUT_INHERIT && | |
469 | o == EXEC_OUTPUT_INHERIT && | |
470 | i == EXEC_INPUT_NULL && | |
471 | !is_terminal_input(context->std_input) && | |
472 | getppid () != 1) | |
473 | return fileno; | |
474 | ||
475 | /* Duplicate from stdout if possible */ | |
476 | if (e == o || e == EXEC_OUTPUT_INHERIT) | |
477 | return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno; | |
071830ff | 478 | |
eb17e935 | 479 | o = e; |
80876c20 | 480 | |
eb17e935 | 481 | } else if (o == EXEC_OUTPUT_INHERIT) { |
21d21ea4 LP |
482 | /* If input got downgraded, inherit the original value */ |
483 | if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input)) | |
eb17e935 | 484 | return open_terminal_as(tty_path(context), O_WRONLY, fileno); |
21d21ea4 | 485 | |
acb591e4 | 486 | /* If the input is connected to anything that's not a /dev/null, inherit that... */ |
ff876e28 | 487 | if (i != EXEC_INPUT_NULL) |
eb17e935 | 488 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; |
071830ff | 489 | |
acb591e4 LP |
490 | /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */ |
491 | if (getppid() != 1) | |
eb17e935 | 492 | return fileno; |
94f04347 | 493 | |
eb17e935 MS |
494 | /* We need to open /dev/null here anew, to get the right access mode. */ |
495 | return open_null_as(O_WRONLY, fileno); | |
071830ff | 496 | } |
94f04347 | 497 | |
eb17e935 | 498 | switch (o) { |
80876c20 LP |
499 | |
500 | case EXEC_OUTPUT_NULL: | |
eb17e935 | 501 | return open_null_as(O_WRONLY, fileno); |
80876c20 LP |
502 | |
503 | case EXEC_OUTPUT_TTY: | |
4f2d528d | 504 | if (is_terminal_input(i)) |
eb17e935 | 505 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; |
80876c20 LP |
506 | |
507 | /* We don't reset the terminal if this is just about output */ | |
eb17e935 | 508 | return open_terminal_as(tty_path(context), O_WRONLY, fileno); |
80876c20 LP |
509 | |
510 | case EXEC_OUTPUT_SYSLOG: | |
28dbc1e8 | 511 | case EXEC_OUTPUT_SYSLOG_AND_CONSOLE: |
9a6bca7a | 512 | case EXEC_OUTPUT_KMSG: |
28dbc1e8 | 513 | case EXEC_OUTPUT_KMSG_AND_CONSOLE: |
706343f4 LP |
514 | case EXEC_OUTPUT_JOURNAL: |
515 | case EXEC_OUTPUT_JOURNAL_AND_CONSOLE: | |
f2341e0a | 516 | r = connect_logger_as(context, o, ident, unit->id, fileno, uid, gid); |
47c1d80d | 517 | if (r < 0) { |
f2341e0a | 518 | log_unit_error_errno(unit, r, "Failed to connect %s to the journal socket, ignoring: %m", fileno == STDOUT_FILENO ? "stdout" : "stderr"); |
eb17e935 | 519 | r = open_null_as(O_WRONLY, fileno); |
47c1d80d MS |
520 | } |
521 | return r; | |
4f2d528d LP |
522 | |
523 | case EXEC_OUTPUT_SOCKET: | |
524 | assert(socket_fd >= 0); | |
eb17e935 | 525 | return dup2(socket_fd, fileno) < 0 ? -errno : fileno; |
94f04347 LP |
526 | |
527 | default: | |
80876c20 | 528 | assert_not_reached("Unknown error type"); |
94f04347 | 529 | } |
071830ff LP |
530 | } |
531 | ||
02a51aba LP |
532 | static int chown_terminal(int fd, uid_t uid) { |
533 | struct stat st; | |
534 | ||
535 | assert(fd >= 0); | |
02a51aba LP |
536 | |
537 | /* This might fail. What matters are the results. */ | |
bab45044 LP |
538 | (void) fchown(fd, uid, -1); |
539 | (void) fchmod(fd, TTY_MODE); | |
02a51aba LP |
540 | |
541 | if (fstat(fd, &st) < 0) | |
542 | return -errno; | |
543 | ||
d8b4e2e9 | 544 | if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE) |
02a51aba LP |
545 | return -EPERM; |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
3d18b167 LP |
550 | static int setup_confirm_stdio(int *_saved_stdin, int *_saved_stdout) { |
551 | _cleanup_close_ int fd = -1, saved_stdin = -1, saved_stdout = -1; | |
552 | int r; | |
80876c20 | 553 | |
80876c20 LP |
554 | assert(_saved_stdin); |
555 | assert(_saved_stdout); | |
556 | ||
af6da548 LP |
557 | saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3); |
558 | if (saved_stdin < 0) | |
559 | return -errno; | |
80876c20 | 560 | |
af6da548 | 561 | saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3); |
3d18b167 LP |
562 | if (saved_stdout < 0) |
563 | return -errno; | |
80876c20 | 564 | |
af6da548 LP |
565 | fd = acquire_terminal( |
566 | "/dev/console", | |
567 | false, | |
568 | false, | |
569 | false, | |
570 | DEFAULT_CONFIRM_USEC); | |
3d18b167 LP |
571 | if (fd < 0) |
572 | return fd; | |
80876c20 | 573 | |
af6da548 LP |
574 | r = chown_terminal(fd, getuid()); |
575 | if (r < 0) | |
3d18b167 | 576 | return r; |
02a51aba | 577 | |
3d18b167 LP |
578 | r = reset_terminal_fd(fd, true); |
579 | if (r < 0) | |
580 | return r; | |
80876c20 | 581 | |
3d18b167 LP |
582 | if (dup2(fd, STDIN_FILENO) < 0) |
583 | return -errno; | |
584 | ||
585 | if (dup2(fd, STDOUT_FILENO) < 0) | |
586 | return -errno; | |
80876c20 LP |
587 | |
588 | if (fd >= 2) | |
03e334a1 | 589 | safe_close(fd); |
3d18b167 | 590 | fd = -1; |
80876c20 LP |
591 | |
592 | *_saved_stdin = saved_stdin; | |
593 | *_saved_stdout = saved_stdout; | |
594 | ||
3d18b167 | 595 | saved_stdin = saved_stdout = -1; |
80876c20 | 596 | |
3d18b167 | 597 | return 0; |
80876c20 LP |
598 | } |
599 | ||
44b601bc | 600 | _printf_(1, 2) static int write_confirm_message(const char *format, ...) { |
03e334a1 | 601 | _cleanup_close_ int fd = -1; |
af6da548 | 602 | va_list ap; |
80876c20 | 603 | |
af6da548 | 604 | assert(format); |
80876c20 | 605 | |
af6da548 LP |
606 | fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); |
607 | if (fd < 0) | |
608 | return fd; | |
80876c20 | 609 | |
af6da548 LP |
610 | va_start(ap, format); |
611 | vdprintf(fd, format, ap); | |
612 | va_end(ap); | |
80876c20 | 613 | |
af6da548 LP |
614 | return 0; |
615 | } | |
80876c20 | 616 | |
3d18b167 | 617 | static int restore_confirm_stdio(int *saved_stdin, int *saved_stdout) { |
af6da548 | 618 | int r = 0; |
80876c20 | 619 | |
af6da548 LP |
620 | assert(saved_stdin); |
621 | assert(saved_stdout); | |
622 | ||
623 | release_terminal(); | |
624 | ||
625 | if (*saved_stdin >= 0) | |
80876c20 | 626 | if (dup2(*saved_stdin, STDIN_FILENO) < 0) |
af6da548 | 627 | r = -errno; |
80876c20 | 628 | |
af6da548 | 629 | if (*saved_stdout >= 0) |
80876c20 | 630 | if (dup2(*saved_stdout, STDOUT_FILENO) < 0) |
af6da548 | 631 | r = -errno; |
80876c20 | 632 | |
3d18b167 LP |
633 | *saved_stdin = safe_close(*saved_stdin); |
634 | *saved_stdout = safe_close(*saved_stdout); | |
af6da548 LP |
635 | |
636 | return r; | |
637 | } | |
638 | ||
639 | static int ask_for_confirmation(char *response, char **argv) { | |
640 | int saved_stdout = -1, saved_stdin = -1, r; | |
e1d75803 | 641 | _cleanup_free_ char *line = NULL; |
af6da548 LP |
642 | |
643 | r = setup_confirm_stdio(&saved_stdin, &saved_stdout); | |
644 | if (r < 0) | |
645 | return r; | |
646 | ||
647 | line = exec_command_line(argv); | |
648 | if (!line) | |
649 | return -ENOMEM; | |
650 | ||
418b9be5 | 651 | r = ask_char(response, "yns", "Execute %s? [Yes, No, Skip] ", line); |
af6da548 LP |
652 | |
653 | restore_confirm_stdio(&saved_stdin, &saved_stdout); | |
654 | ||
655 | return r; | |
80876c20 LP |
656 | } |
657 | ||
81a2b7ce LP |
658 | static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) { |
659 | bool keep_groups = false; | |
660 | int r; | |
661 | ||
662 | assert(context); | |
663 | ||
35b8ca3a | 664 | /* Lookup and set GID and supplementary group list. Here too |
81a2b7ce LP |
665 | * we avoid NSS lookups for gid=0. */ |
666 | ||
667 | if (context->group || username) { | |
81a2b7ce LP |
668 | /* First step, initialize groups from /etc/groups */ |
669 | if (username && gid != 0) { | |
670 | if (initgroups(username, gid) < 0) | |
671 | return -errno; | |
672 | ||
673 | keep_groups = true; | |
674 | } | |
675 | ||
676 | /* Second step, set our gids */ | |
677 | if (setresgid(gid, gid, gid) < 0) | |
678 | return -errno; | |
679 | } | |
680 | ||
681 | if (context->supplementary_groups) { | |
682 | int ngroups_max, k; | |
683 | gid_t *gids; | |
684 | char **i; | |
685 | ||
686 | /* Final step, initialize any manually set supplementary groups */ | |
da19d5c1 | 687 | assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0); |
81a2b7ce LP |
688 | |
689 | if (!(gids = new(gid_t, ngroups_max))) | |
690 | return -ENOMEM; | |
691 | ||
692 | if (keep_groups) { | |
3cc2aff1 LP |
693 | k = getgroups(ngroups_max, gids); |
694 | if (k < 0) { | |
81a2b7ce LP |
695 | free(gids); |
696 | return -errno; | |
697 | } | |
698 | } else | |
699 | k = 0; | |
700 | ||
701 | STRV_FOREACH(i, context->supplementary_groups) { | |
4b67834e | 702 | const char *g; |
81a2b7ce LP |
703 | |
704 | if (k >= ngroups_max) { | |
705 | free(gids); | |
706 | return -E2BIG; | |
707 | } | |
708 | ||
4b67834e LP |
709 | g = *i; |
710 | r = get_group_creds(&g, gids+k); | |
711 | if (r < 0) { | |
81a2b7ce LP |
712 | free(gids); |
713 | return r; | |
714 | } | |
715 | ||
716 | k++; | |
717 | } | |
718 | ||
719 | if (setgroups(k, gids) < 0) { | |
720 | free(gids); | |
721 | return -errno; | |
722 | } | |
723 | ||
724 | free(gids); | |
725 | } | |
726 | ||
727 | return 0; | |
728 | } | |
729 | ||
730 | static int enforce_user(const ExecContext *context, uid_t uid) { | |
81a2b7ce LP |
731 | assert(context); |
732 | ||
733 | /* Sets (but doesn't lookup) the uid and make sure we keep the | |
734 | * capabilities while doing so. */ | |
735 | ||
736 | if (context->capabilities) { | |
5ce70e5b | 737 | _cleanup_cap_free_ cap_t d = NULL; |
81a2b7ce LP |
738 | static const cap_value_t bits[] = { |
739 | CAP_SETUID, /* Necessary so that we can run setresuid() below */ | |
740 | CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */ | |
741 | }; | |
742 | ||
743 | /* First step: If we need to keep capabilities but | |
744 | * drop privileges we need to make sure we keep our | |
cbb21cca | 745 | * caps, while we drop privileges. */ |
693ced48 | 746 | if (uid != 0) { |
cbb21cca | 747 | int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS; |
693ced48 LP |
748 | |
749 | if (prctl(PR_GET_SECUREBITS) != sb) | |
750 | if (prctl(PR_SET_SECUREBITS, sb) < 0) | |
751 | return -errno; | |
752 | } | |
81a2b7ce | 753 | |
35b8ca3a | 754 | /* Second step: set the capabilities. This will reduce |
81a2b7ce LP |
755 | * the capabilities to the minimum we need. */ |
756 | ||
5ce70e5b ZJS |
757 | d = cap_dup(context->capabilities); |
758 | if (!d) | |
81a2b7ce LP |
759 | return -errno; |
760 | ||
761 | if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 || | |
5ce70e5b ZJS |
762 | cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) |
763 | return -errno; | |
81a2b7ce | 764 | |
5ce70e5b ZJS |
765 | if (cap_set_proc(d) < 0) |
766 | return -errno; | |
81a2b7ce LP |
767 | } |
768 | ||
769 | /* Third step: actually set the uids */ | |
770 | if (setresuid(uid, uid, uid) < 0) | |
771 | return -errno; | |
772 | ||
773 | /* At this point we should have all necessary capabilities but | |
774 | are otherwise a normal user. However, the caps might got | |
775 | corrupted due to the setresuid() so we need clean them up | |
776 | later. This is done outside of this call. */ | |
777 | ||
778 | return 0; | |
779 | } | |
780 | ||
5b6319dc LP |
781 | #ifdef HAVE_PAM |
782 | ||
783 | static int null_conv( | |
784 | int num_msg, | |
785 | const struct pam_message **msg, | |
786 | struct pam_response **resp, | |
787 | void *appdata_ptr) { | |
788 | ||
789 | /* We don't support conversations */ | |
790 | ||
791 | return PAM_CONV_ERR; | |
792 | } | |
793 | ||
794 | static int setup_pam( | |
795 | const char *name, | |
796 | const char *user, | |
940c5210 | 797 | uid_t uid, |
5b6319dc LP |
798 | const char *tty, |
799 | char ***pam_env, | |
800 | int fds[], unsigned n_fds) { | |
801 | ||
802 | static const struct pam_conv conv = { | |
803 | .conv = null_conv, | |
804 | .appdata_ptr = NULL | |
805 | }; | |
806 | ||
2d7c6aa2 | 807 | _cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL; |
5b6319dc | 808 | pam_handle_t *handle = NULL; |
d6e5f3ad | 809 | sigset_t old_ss; |
5b6319dc | 810 | int pam_code = PAM_SUCCESS; |
2d7c6aa2 | 811 | int err = 0; |
5b6319dc LP |
812 | char **e = NULL; |
813 | bool close_session = false; | |
814 | pid_t pam_pid = 0, parent_pid; | |
970edce6 | 815 | int flags = 0; |
5b6319dc LP |
816 | |
817 | assert(name); | |
818 | assert(user); | |
819 | assert(pam_env); | |
820 | ||
821 | /* We set up PAM in the parent process, then fork. The child | |
35b8ca3a | 822 | * will then stay around until killed via PR_GET_PDEATHSIG or |
5b6319dc LP |
823 | * systemd via the cgroup logic. It will then remove the PAM |
824 | * session again. The parent process will exec() the actual | |
825 | * daemon. We do things this way to ensure that the main PID | |
826 | * of the daemon is the one we initially fork()ed. */ | |
827 | ||
2d7c6aa2 DH |
828 | err = barrier_create(&barrier); |
829 | if (err < 0) | |
830 | goto fail; | |
831 | ||
553d2243 | 832 | if (log_get_max_level() < LOG_DEBUG) |
970edce6 ZJS |
833 | flags |= PAM_SILENT; |
834 | ||
f546241b ZJS |
835 | pam_code = pam_start(name, user, &conv, &handle); |
836 | if (pam_code != PAM_SUCCESS) { | |
5b6319dc LP |
837 | handle = NULL; |
838 | goto fail; | |
839 | } | |
840 | ||
f546241b ZJS |
841 | if (tty) { |
842 | pam_code = pam_set_item(handle, PAM_TTY, tty); | |
843 | if (pam_code != PAM_SUCCESS) | |
5b6319dc | 844 | goto fail; |
f546241b | 845 | } |
5b6319dc | 846 | |
970edce6 | 847 | pam_code = pam_acct_mgmt(handle, flags); |
f546241b | 848 | if (pam_code != PAM_SUCCESS) |
5b6319dc LP |
849 | goto fail; |
850 | ||
970edce6 | 851 | pam_code = pam_open_session(handle, flags); |
f546241b | 852 | if (pam_code != PAM_SUCCESS) |
5b6319dc LP |
853 | goto fail; |
854 | ||
855 | close_session = true; | |
856 | ||
f546241b ZJS |
857 | e = pam_getenvlist(handle); |
858 | if (!e) { | |
5b6319dc LP |
859 | pam_code = PAM_BUF_ERR; |
860 | goto fail; | |
861 | } | |
862 | ||
863 | /* Block SIGTERM, so that we know that it won't get lost in | |
864 | * the child */ | |
ce30c8dc | 865 | |
72c0a2c2 | 866 | assert_se(sigprocmask_many(SIG_BLOCK, &old_ss, SIGTERM, -1) >= 0); |
5b6319dc LP |
867 | |
868 | parent_pid = getpid(); | |
869 | ||
f546241b ZJS |
870 | pam_pid = fork(); |
871 | if (pam_pid < 0) | |
5b6319dc LP |
872 | goto fail; |
873 | ||
874 | if (pam_pid == 0) { | |
875 | int sig; | |
876 | int r = EXIT_PAM; | |
877 | ||
878 | /* The child's job is to reset the PAM session on | |
879 | * termination */ | |
2d7c6aa2 | 880 | barrier_set_role(&barrier, BARRIER_CHILD); |
5b6319dc LP |
881 | |
882 | /* This string must fit in 10 chars (i.e. the length | |
5d6b1584 LP |
883 | * of "/sbin/init"), to look pretty in /bin/ps */ |
884 | rename_process("(sd-pam)"); | |
5b6319dc LP |
885 | |
886 | /* Make sure we don't keep open the passed fds in this | |
887 | child. We assume that otherwise only those fds are | |
888 | open here that have been opened by PAM. */ | |
889 | close_many(fds, n_fds); | |
890 | ||
940c5210 AK |
891 | /* Drop privileges - we don't need any to pam_close_session |
892 | * and this will make PR_SET_PDEATHSIG work in most cases. | |
893 | * If this fails, ignore the error - but expect sd-pam threads | |
894 | * to fail to exit normally */ | |
895 | if (setresuid(uid, uid, uid) < 0) | |
da927ba9 | 896 | log_error_errno(r, "Error: Failed to setresuid() in sd-pam: %m"); |
940c5210 | 897 | |
ce30c8dc LP |
898 | (void) ignore_signals(SIGPIPE, -1); |
899 | ||
940c5210 AK |
900 | /* Wait until our parent died. This will only work if |
901 | * the above setresuid() succeeds, otherwise the kernel | |
902 | * will not allow unprivileged parents kill their privileged | |
903 | * children this way. We rely on the control groups kill logic | |
5b6319dc LP |
904 | * to do the rest for us. */ |
905 | if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) | |
906 | goto child_finish; | |
907 | ||
2d7c6aa2 DH |
908 | /* Tell the parent that our setup is done. This is especially |
909 | * important regarding dropping privileges. Otherwise, unit | |
910 | * setup might race against our setresuid(2) call. */ | |
911 | barrier_place(&barrier); | |
912 | ||
5b6319dc LP |
913 | /* Check if our parent process might already have |
914 | * died? */ | |
915 | if (getppid() == parent_pid) { | |
d6e5f3ad DM |
916 | sigset_t ss; |
917 | ||
918 | assert_se(sigemptyset(&ss) >= 0); | |
919 | assert_se(sigaddset(&ss, SIGTERM) >= 0); | |
920 | ||
3dead8d9 LP |
921 | for (;;) { |
922 | if (sigwait(&ss, &sig) < 0) { | |
923 | if (errno == EINTR) | |
924 | continue; | |
925 | ||
926 | goto child_finish; | |
927 | } | |
5b6319dc | 928 | |
3dead8d9 LP |
929 | assert(sig == SIGTERM); |
930 | break; | |
931 | } | |
5b6319dc LP |
932 | } |
933 | ||
3dead8d9 | 934 | /* If our parent died we'll end the session */ |
f546241b | 935 | if (getppid() != parent_pid) { |
970edce6 | 936 | pam_code = pam_close_session(handle, flags); |
f546241b | 937 | if (pam_code != PAM_SUCCESS) |
5b6319dc | 938 | goto child_finish; |
f546241b | 939 | } |
5b6319dc LP |
940 | |
941 | r = 0; | |
942 | ||
943 | child_finish: | |
970edce6 | 944 | pam_end(handle, pam_code | flags); |
5b6319dc LP |
945 | _exit(r); |
946 | } | |
947 | ||
2d7c6aa2 DH |
948 | barrier_set_role(&barrier, BARRIER_PARENT); |
949 | ||
5b6319dc LP |
950 | /* If the child was forked off successfully it will do all the |
951 | * cleanups, so forget about the handle here. */ | |
952 | handle = NULL; | |
953 | ||
3b8bddde | 954 | /* Unblock SIGTERM again in the parent */ |
72c0a2c2 | 955 | assert_se(sigprocmask(SIG_SETMASK, &old_ss, NULL) >= 0); |
5b6319dc LP |
956 | |
957 | /* We close the log explicitly here, since the PAM modules | |
958 | * might have opened it, but we don't want this fd around. */ | |
959 | closelog(); | |
960 | ||
2d7c6aa2 DH |
961 | /* Synchronously wait for the child to initialize. We don't care for |
962 | * errors as we cannot recover. However, warn loudly if it happens. */ | |
963 | if (!barrier_place_and_sync(&barrier)) | |
964 | log_error("PAM initialization failed"); | |
965 | ||
aa87e624 LP |
966 | *pam_env = e; |
967 | e = NULL; | |
968 | ||
5b6319dc LP |
969 | return 0; |
970 | ||
971 | fail: | |
970edce6 ZJS |
972 | if (pam_code != PAM_SUCCESS) { |
973 | log_error("PAM failed: %s", pam_strerror(handle, pam_code)); | |
9ba35398 | 974 | err = -EPERM; /* PAM errors do not map to errno */ |
970edce6 | 975 | } else { |
2d7c6aa2 | 976 | err = log_error_errno(err < 0 ? err : errno, "PAM failed: %m"); |
970edce6 | 977 | } |
9ba35398 | 978 | |
5b6319dc LP |
979 | if (handle) { |
980 | if (close_session) | |
970edce6 | 981 | pam_code = pam_close_session(handle, flags); |
5b6319dc | 982 | |
970edce6 | 983 | pam_end(handle, pam_code | flags); |
5b6319dc LP |
984 | } |
985 | ||
986 | strv_free(e); | |
987 | ||
988 | closelog(); | |
989 | ||
430c18ed | 990 | if (pam_pid > 1) { |
5b6319dc | 991 | kill(pam_pid, SIGTERM); |
430c18ed LP |
992 | kill(pam_pid, SIGCONT); |
993 | } | |
5b6319dc | 994 | |
9ba35398 | 995 | return err; |
5b6319dc LP |
996 | } |
997 | #endif | |
998 | ||
5d6b1584 LP |
999 | static void rename_process_from_path(const char *path) { |
1000 | char process_name[11]; | |
1001 | const char *p; | |
1002 | size_t l; | |
1003 | ||
1004 | /* This resulting string must fit in 10 chars (i.e. the length | |
1005 | * of "/sbin/init") to look pretty in /bin/ps */ | |
1006 | ||
2b6bf07d | 1007 | p = basename(path); |
5d6b1584 LP |
1008 | if (isempty(p)) { |
1009 | rename_process("(...)"); | |
1010 | return; | |
1011 | } | |
1012 | ||
1013 | l = strlen(p); | |
1014 | if (l > 8) { | |
1015 | /* The end of the process name is usually more | |
1016 | * interesting, since the first bit might just be | |
1017 | * "systemd-" */ | |
1018 | p = p + l - 8; | |
1019 | l = 8; | |
1020 | } | |
1021 | ||
1022 | process_name[0] = '('; | |
1023 | memcpy(process_name+1, p, l); | |
1024 | process_name[1+l] = ')'; | |
1025 | process_name[1+l+1] = 0; | |
1026 | ||
1027 | rename_process(process_name); | |
1028 | } | |
1029 | ||
c0467cf3 | 1030 | #ifdef HAVE_SECCOMP |
17df7223 | 1031 | |
822a5960 | 1032 | static int apply_seccomp(const ExecContext *c) { |
17df7223 LP |
1033 | uint32_t negative_action, action; |
1034 | scmp_filter_ctx *seccomp; | |
c0467cf3 RC |
1035 | Iterator i; |
1036 | void *id; | |
17df7223 | 1037 | int r; |
8351ceae | 1038 | |
c0467cf3 | 1039 | assert(c); |
8351ceae | 1040 | |
17df7223 LP |
1041 | negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno); |
1042 | ||
1043 | seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW); | |
1044 | if (!seccomp) | |
1045 | return -ENOMEM; | |
8351ceae | 1046 | |
e9642be2 LP |
1047 | if (c->syscall_archs) { |
1048 | ||
1049 | SET_FOREACH(id, c->syscall_archs, i) { | |
1050 | r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1); | |
1051 | if (r == -EEXIST) | |
1052 | continue; | |
7c66bae2 LP |
1053 | if (r < 0) |
1054 | goto finish; | |
e9642be2 | 1055 | } |
e9642be2 | 1056 | |
7c66bae2 | 1057 | } else { |
e9642be2 | 1058 | r = seccomp_add_secondary_archs(seccomp); |
7c66bae2 LP |
1059 | if (r < 0) |
1060 | goto finish; | |
57183d11 | 1061 | } |
8351ceae | 1062 | |
57183d11 | 1063 | action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action; |
17df7223 LP |
1064 | SET_FOREACH(id, c->syscall_filter, i) { |
1065 | r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0); | |
7c66bae2 LP |
1066 | if (r < 0) |
1067 | goto finish; | |
c0467cf3 | 1068 | } |
8351ceae | 1069 | |
7c66bae2 LP |
1070 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); |
1071 | if (r < 0) | |
1072 | goto finish; | |
1073 | ||
17df7223 | 1074 | r = seccomp_load(seccomp); |
7c66bae2 LP |
1075 | |
1076 | finish: | |
17df7223 | 1077 | seccomp_release(seccomp); |
4298d0b5 LP |
1078 | return r; |
1079 | } | |
1080 | ||
822a5960 | 1081 | static int apply_address_families(const ExecContext *c) { |
4298d0b5 LP |
1082 | scmp_filter_ctx *seccomp; |
1083 | Iterator i; | |
1084 | int r; | |
1085 | ||
1086 | assert(c); | |
1087 | ||
1088 | seccomp = seccomp_init(SCMP_ACT_ALLOW); | |
1089 | if (!seccomp) | |
1090 | return -ENOMEM; | |
1091 | ||
1092 | r = seccomp_add_secondary_archs(seccomp); | |
1093 | if (r < 0) | |
1094 | goto finish; | |
1095 | ||
1096 | if (c->address_families_whitelist) { | |
1097 | int af, first = 0, last = 0; | |
1098 | void *afp; | |
1099 | ||
1100 | /* If this is a whitelist, we first block the address | |
1101 | * families that are out of range and then everything | |
1102 | * that is not in the set. First, we find the lowest | |
1103 | * and highest address family in the set. */ | |
1104 | ||
1105 | SET_FOREACH(afp, c->address_families, i) { | |
1106 | af = PTR_TO_INT(afp); | |
17df7223 | 1107 | |
4298d0b5 LP |
1108 | if (af <= 0 || af >= af_max()) |
1109 | continue; | |
1110 | ||
1111 | if (first == 0 || af < first) | |
1112 | first = af; | |
1113 | ||
1114 | if (last == 0 || af > last) | |
1115 | last = af; | |
1116 | } | |
1117 | ||
1118 | assert((first == 0) == (last == 0)); | |
1119 | ||
1120 | if (first == 0) { | |
1121 | ||
1122 | /* No entries in the valid range, block everything */ | |
1123 | r = seccomp_rule_add( | |
1124 | seccomp, | |
1125 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1126 | SCMP_SYS(socket), | |
1127 | 0); | |
1128 | if (r < 0) | |
1129 | goto finish; | |
1130 | ||
1131 | } else { | |
1132 | ||
1133 | /* Block everything below the first entry */ | |
1134 | r = seccomp_rule_add( | |
1135 | seccomp, | |
1136 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1137 | SCMP_SYS(socket), | |
1138 | 1, | |
1139 | SCMP_A0(SCMP_CMP_LT, first)); | |
1140 | if (r < 0) | |
1141 | goto finish; | |
1142 | ||
1143 | /* Block everything above the last entry */ | |
1144 | r = seccomp_rule_add( | |
1145 | seccomp, | |
1146 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1147 | SCMP_SYS(socket), | |
1148 | 1, | |
1149 | SCMP_A0(SCMP_CMP_GT, last)); | |
1150 | if (r < 0) | |
1151 | goto finish; | |
1152 | ||
1153 | /* Block everything between the first and last | |
1154 | * entry */ | |
1155 | for (af = 1; af < af_max(); af++) { | |
1156 | ||
1157 | if (set_contains(c->address_families, INT_TO_PTR(af))) | |
1158 | continue; | |
1159 | ||
1160 | r = seccomp_rule_add( | |
1161 | seccomp, | |
1162 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1163 | SCMP_SYS(socket), | |
1164 | 1, | |
1165 | SCMP_A0(SCMP_CMP_EQ, af)); | |
1166 | if (r < 0) | |
1167 | goto finish; | |
1168 | } | |
1169 | } | |
1170 | ||
1171 | } else { | |
1172 | void *af; | |
1173 | ||
1174 | /* If this is a blacklist, then generate one rule for | |
1175 | * each address family that are then combined in OR | |
1176 | * checks. */ | |
1177 | ||
1178 | SET_FOREACH(af, c->address_families, i) { | |
1179 | ||
1180 | r = seccomp_rule_add( | |
1181 | seccomp, | |
1182 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1183 | SCMP_SYS(socket), | |
1184 | 1, | |
1185 | SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af))); | |
1186 | if (r < 0) | |
1187 | goto finish; | |
1188 | } | |
1189 | } | |
1190 | ||
1191 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1192 | if (r < 0) | |
1193 | goto finish; | |
1194 | ||
1195 | r = seccomp_load(seccomp); | |
1196 | ||
1197 | finish: | |
1198 | seccomp_release(seccomp); | |
17df7223 | 1199 | return r; |
8351ceae | 1200 | } |
4298d0b5 | 1201 | |
c0467cf3 | 1202 | #endif |
8351ceae | 1203 | |
31a7eb86 ZJS |
1204 | static void do_idle_pipe_dance(int idle_pipe[4]) { |
1205 | assert(idle_pipe); | |
1206 | ||
03e334a1 | 1207 | |
54eb2300 LP |
1208 | idle_pipe[1] = safe_close(idle_pipe[1]); |
1209 | idle_pipe[2] = safe_close(idle_pipe[2]); | |
31a7eb86 ZJS |
1210 | |
1211 | if (idle_pipe[0] >= 0) { | |
1212 | int r; | |
1213 | ||
1214 | r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC); | |
1215 | ||
1216 | if (idle_pipe[3] >= 0 && r == 0 /* timeout */) { | |
c7cc737f LP |
1217 | ssize_t n; |
1218 | ||
31a7eb86 | 1219 | /* Signal systemd that we are bored and want to continue. */ |
c7cc737f LP |
1220 | n = write(idle_pipe[3], "x", 1); |
1221 | if (n > 0) | |
cd972d69 ZJS |
1222 | /* Wait for systemd to react to the signal above. */ |
1223 | fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC); | |
31a7eb86 ZJS |
1224 | } |
1225 | ||
54eb2300 | 1226 | idle_pipe[0] = safe_close(idle_pipe[0]); |
31a7eb86 ZJS |
1227 | |
1228 | } | |
1229 | ||
54eb2300 | 1230 | idle_pipe[3] = safe_close(idle_pipe[3]); |
31a7eb86 ZJS |
1231 | } |
1232 | ||
7cae38c4 | 1233 | static int build_environment( |
9fa95f85 | 1234 | const ExecContext *c, |
7cae38c4 | 1235 | unsigned n_fds, |
8dd4c05b | 1236 | char ** fd_names, |
09812eb7 | 1237 | usec_t watchdog_usec, |
7cae38c4 LP |
1238 | const char *home, |
1239 | const char *username, | |
1240 | const char *shell, | |
1241 | char ***ret) { | |
1242 | ||
1243 | _cleanup_strv_free_ char **our_env = NULL; | |
1244 | unsigned n_env = 0; | |
1245 | char *x; | |
1246 | ||
1247 | assert(c); | |
1248 | assert(ret); | |
1249 | ||
8dd4c05b | 1250 | our_env = new0(char*, 11); |
7cae38c4 LP |
1251 | if (!our_env) |
1252 | return -ENOMEM; | |
1253 | ||
1254 | if (n_fds > 0) { | |
8dd4c05b LP |
1255 | _cleanup_free_ char *joined = NULL; |
1256 | ||
ccd06097 | 1257 | if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0) |
7cae38c4 LP |
1258 | return -ENOMEM; |
1259 | our_env[n_env++] = x; | |
1260 | ||
1261 | if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0) | |
1262 | return -ENOMEM; | |
1263 | our_env[n_env++] = x; | |
8dd4c05b LP |
1264 | |
1265 | joined = strv_join(fd_names, ":"); | |
1266 | if (!joined) | |
1267 | return -ENOMEM; | |
1268 | ||
1269 | x = strjoin("LISTEN_FDNAMES=", joined, NULL); | |
1270 | if (!x) | |
1271 | return -ENOMEM; | |
1272 | our_env[n_env++] = x; | |
7cae38c4 LP |
1273 | } |
1274 | ||
09812eb7 | 1275 | if (watchdog_usec > 0) { |
ccd06097 | 1276 | if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0) |
09812eb7 LP |
1277 | return -ENOMEM; |
1278 | our_env[n_env++] = x; | |
1279 | ||
de0671ee | 1280 | if (asprintf(&x, "WATCHDOG_USEC="USEC_FMT, watchdog_usec) < 0) |
09812eb7 LP |
1281 | return -ENOMEM; |
1282 | our_env[n_env++] = x; | |
1283 | } | |
1284 | ||
7cae38c4 LP |
1285 | if (home) { |
1286 | x = strappend("HOME=", home); | |
1287 | if (!x) | |
1288 | return -ENOMEM; | |
1289 | our_env[n_env++] = x; | |
1290 | } | |
1291 | ||
1292 | if (username) { | |
1293 | x = strappend("LOGNAME=", username); | |
1294 | if (!x) | |
1295 | return -ENOMEM; | |
1296 | our_env[n_env++] = x; | |
1297 | ||
1298 | x = strappend("USER=", username); | |
1299 | if (!x) | |
1300 | return -ENOMEM; | |
1301 | our_env[n_env++] = x; | |
1302 | } | |
1303 | ||
1304 | if (shell) { | |
1305 | x = strappend("SHELL=", shell); | |
1306 | if (!x) | |
1307 | return -ENOMEM; | |
1308 | our_env[n_env++] = x; | |
1309 | } | |
1310 | ||
1311 | if (is_terminal_input(c->std_input) || | |
1312 | c->std_output == EXEC_OUTPUT_TTY || | |
1313 | c->std_error == EXEC_OUTPUT_TTY || | |
1314 | c->tty_path) { | |
1315 | ||
1316 | x = strdup(default_term_for_tty(tty_path(c))); | |
1317 | if (!x) | |
1318 | return -ENOMEM; | |
1319 | our_env[n_env++] = x; | |
1320 | } | |
1321 | ||
1322 | our_env[n_env++] = NULL; | |
8dd4c05b | 1323 | assert(n_env <= 11); |
7cae38c4 LP |
1324 | |
1325 | *ret = our_env; | |
1326 | our_env = NULL; | |
1327 | ||
1328 | return 0; | |
1329 | } | |
1330 | ||
8b44a3d2 LP |
1331 | static bool exec_needs_mount_namespace( |
1332 | const ExecContext *context, | |
1333 | const ExecParameters *params, | |
1334 | ExecRuntime *runtime) { | |
1335 | ||
1336 | assert(context); | |
1337 | assert(params); | |
1338 | ||
1339 | if (!strv_isempty(context->read_write_dirs) || | |
1340 | !strv_isempty(context->read_only_dirs) || | |
1341 | !strv_isempty(context->inaccessible_dirs)) | |
1342 | return true; | |
1343 | ||
1344 | if (context->mount_flags != 0) | |
1345 | return true; | |
1346 | ||
1347 | if (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) | |
1348 | return true; | |
1349 | ||
1350 | if (params->bus_endpoint_path) | |
1351 | return true; | |
1352 | ||
1353 | if (context->private_devices || | |
1354 | context->protect_system != PROTECT_SYSTEM_NO || | |
1355 | context->protect_home != PROTECT_HOME_NO) | |
1356 | return true; | |
1357 | ||
1358 | return false; | |
1359 | } | |
1360 | ||
a34ceba6 LP |
1361 | static int close_remaining_fds( |
1362 | const ExecParameters *params, | |
1363 | ExecRuntime *runtime, | |
1364 | int socket_fd, | |
1365 | int *fds, unsigned n_fds) { | |
1366 | ||
1367 | unsigned n_dont_close = 0; | |
1368 | int dont_close[n_fds + 7]; | |
1369 | ||
1370 | assert(params); | |
1371 | ||
1372 | if (params->stdin_fd >= 0) | |
1373 | dont_close[n_dont_close++] = params->stdin_fd; | |
1374 | if (params->stdout_fd >= 0) | |
1375 | dont_close[n_dont_close++] = params->stdout_fd; | |
1376 | if (params->stderr_fd >= 0) | |
1377 | dont_close[n_dont_close++] = params->stderr_fd; | |
1378 | ||
1379 | if (socket_fd >= 0) | |
1380 | dont_close[n_dont_close++] = socket_fd; | |
1381 | if (n_fds > 0) { | |
1382 | memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds); | |
1383 | n_dont_close += n_fds; | |
1384 | } | |
1385 | ||
1386 | if (params->bus_endpoint_fd >= 0) | |
1387 | dont_close[n_dont_close++] = params->bus_endpoint_fd; | |
1388 | ||
1389 | if (runtime) { | |
1390 | if (runtime->netns_storage_socket[0] >= 0) | |
1391 | dont_close[n_dont_close++] = runtime->netns_storage_socket[0]; | |
1392 | if (runtime->netns_storage_socket[1] >= 0) | |
1393 | dont_close[n_dont_close++] = runtime->netns_storage_socket[1]; | |
1394 | } | |
1395 | ||
1396 | return close_all_fds(dont_close, n_dont_close); | |
1397 | } | |
1398 | ||
ff0af2a1 | 1399 | static int exec_child( |
f2341e0a | 1400 | Unit *unit, |
ff0af2a1 LP |
1401 | ExecCommand *command, |
1402 | const ExecContext *context, | |
1403 | const ExecParameters *params, | |
1404 | ExecRuntime *runtime, | |
1405 | char **argv, | |
1406 | int socket_fd, | |
1407 | int *fds, unsigned n_fds, | |
1408 | char **files_env, | |
1409 | int *exit_status) { | |
d35fbf6b DM |
1410 | |
1411 | _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL; | |
9008e1ac | 1412 | _cleanup_free_ char *mac_selinux_context_net = NULL; |
5f5d8eab | 1413 | const char *username = NULL, *home = NULL, *shell = NULL, *wd; |
fed1e721 LP |
1414 | uid_t uid = UID_INVALID; |
1415 | gid_t gid = GID_INVALID; | |
ff0af2a1 | 1416 | int i, r; |
ee818b89 | 1417 | bool needs_mount_namespace; |
034c6ed7 | 1418 | |
f2341e0a | 1419 | assert(unit); |
5cb5a6ff LP |
1420 | assert(command); |
1421 | assert(context); | |
d35fbf6b | 1422 | assert(params); |
ff0af2a1 | 1423 | assert(exit_status); |
d35fbf6b DM |
1424 | |
1425 | rename_process_from_path(command->path); | |
1426 | ||
1427 | /* We reset exactly these signals, since they are the | |
1428 | * only ones we set to SIG_IGN in the main daemon. All | |
1429 | * others we leave untouched because we set them to | |
1430 | * SIG_DFL or a valid handler initially, both of which | |
1431 | * will be demoted to SIG_DFL. */ | |
ce30c8dc LP |
1432 | (void) default_signals(SIGNALS_CRASH_HANDLER, |
1433 | SIGNALS_IGNORE, -1); | |
d35fbf6b DM |
1434 | |
1435 | if (context->ignore_sigpipe) | |
ce30c8dc | 1436 | (void) ignore_signals(SIGPIPE, -1); |
d35fbf6b | 1437 | |
ff0af2a1 LP |
1438 | r = reset_signal_mask(); |
1439 | if (r < 0) { | |
1440 | *exit_status = EXIT_SIGNAL_MASK; | |
1441 | return r; | |
d35fbf6b | 1442 | } |
034c6ed7 | 1443 | |
d35fbf6b DM |
1444 | if (params->idle_pipe) |
1445 | do_idle_pipe_dance(params->idle_pipe); | |
4f2d528d | 1446 | |
d35fbf6b DM |
1447 | /* Close sockets very early to make sure we don't |
1448 | * block init reexecution because it cannot bind its | |
1449 | * sockets */ | |
ff0af2a1 | 1450 | |
d35fbf6b | 1451 | log_forget_fds(); |
4f2d528d | 1452 | |
a34ceba6 | 1453 | r = close_remaining_fds(params, runtime, socket_fd, fds, n_fds); |
ff0af2a1 LP |
1454 | if (r < 0) { |
1455 | *exit_status = EXIT_FDS; | |
1456 | return r; | |
8c7be95e LP |
1457 | } |
1458 | ||
d35fbf6b DM |
1459 | if (!context->same_pgrp) |
1460 | if (setsid() < 0) { | |
ff0af2a1 | 1461 | *exit_status = EXIT_SETSID; |
d35fbf6b DM |
1462 | return -errno; |
1463 | } | |
9e2f7c11 | 1464 | |
d35fbf6b DM |
1465 | exec_context_tty_reset(context); |
1466 | ||
1467 | if (params->confirm_spawn) { | |
1468 | char response; | |
1469 | ||
ff0af2a1 LP |
1470 | r = ask_for_confirmation(&response, argv); |
1471 | if (r == -ETIMEDOUT) | |
d35fbf6b | 1472 | write_confirm_message("Confirmation question timed out, assuming positive response.\n"); |
ff0af2a1 LP |
1473 | else if (r < 0) |
1474 | write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-r)); | |
d35fbf6b DM |
1475 | else if (response == 's') { |
1476 | write_confirm_message("Skipping execution.\n"); | |
ff0af2a1 | 1477 | *exit_status = EXIT_CONFIRM; |
d35fbf6b DM |
1478 | return -ECANCELED; |
1479 | } else if (response == 'n') { | |
1480 | write_confirm_message("Failing execution.\n"); | |
ff0af2a1 | 1481 | *exit_status = 0; |
d35fbf6b DM |
1482 | return 0; |
1483 | } | |
1484 | } | |
1a63a750 | 1485 | |
524daa8c ZJS |
1486 | if (context->user) { |
1487 | username = context->user; | |
ff0af2a1 LP |
1488 | r = get_user_creds(&username, &uid, &gid, &home, &shell); |
1489 | if (r < 0) { | |
1490 | *exit_status = EXIT_USER; | |
1491 | return r; | |
524daa8c ZJS |
1492 | } |
1493 | } | |
1494 | ||
5bc7452b RC |
1495 | if (context->group) { |
1496 | const char *g = context->group; | |
1497 | ||
1498 | r = get_group_creds(&g, &gid); | |
1499 | if (r < 0) { | |
1500 | *exit_status = EXIT_GROUP; | |
1501 | return r; | |
1502 | } | |
1503 | } | |
1504 | ||
1505 | ||
d35fbf6b DM |
1506 | /* If a socket is connected to STDIN/STDOUT/STDERR, we |
1507 | * must sure to drop O_NONBLOCK */ | |
1508 | if (socket_fd >= 0) | |
a34ceba6 | 1509 | (void) fd_nonblock(socket_fd, false); |
acbb0225 | 1510 | |
a34ceba6 | 1511 | r = setup_input(context, params, socket_fd); |
ff0af2a1 LP |
1512 | if (r < 0) { |
1513 | *exit_status = EXIT_STDIN; | |
1514 | return r; | |
d35fbf6b | 1515 | } |
034c6ed7 | 1516 | |
a34ceba6 | 1517 | r = setup_output(unit, context, params, STDOUT_FILENO, socket_fd, basename(command->path), uid, gid); |
ff0af2a1 LP |
1518 | if (r < 0) { |
1519 | *exit_status = EXIT_STDOUT; | |
1520 | return r; | |
d35fbf6b DM |
1521 | } |
1522 | ||
a34ceba6 | 1523 | r = setup_output(unit, context, params, STDERR_FILENO, socket_fd, basename(command->path), uid, gid); |
ff0af2a1 LP |
1524 | if (r < 0) { |
1525 | *exit_status = EXIT_STDERR; | |
1526 | return r; | |
d35fbf6b DM |
1527 | } |
1528 | ||
1529 | if (params->cgroup_path) { | |
ff0af2a1 LP |
1530 | r = cg_attach_everywhere(params->cgroup_supported, params->cgroup_path, 0, NULL, NULL); |
1531 | if (r < 0) { | |
1532 | *exit_status = EXIT_CGROUP; | |
1533 | return r; | |
309bff19 | 1534 | } |
d35fbf6b | 1535 | } |
309bff19 | 1536 | |
d35fbf6b | 1537 | if (context->oom_score_adjust_set) { |
d5243d62 | 1538 | char t[DECIMAL_STR_MAX(context->oom_score_adjust)]; |
f2b68789 | 1539 | |
d5243d62 LP |
1540 | /* When we can't make this change due to EPERM, then |
1541 | * let's silently skip over it. User namespaces | |
1542 | * prohibit write access to this file, and we | |
1543 | * shouldn't trip up over that. */ | |
613b411c | 1544 | |
d5243d62 | 1545 | sprintf(t, "%i", context->oom_score_adjust); |
ad118bda | 1546 | r = write_string_file("/proc/self/oom_score_adj", t, 0); |
6cb7fa17 | 1547 | if (r == -EPERM || r == -EACCES) { |
ff0af2a1 | 1548 | log_open(); |
f2341e0a | 1549 | log_unit_debug_errno(unit, r, "Failed to adjust OOM setting, assuming containerized execution, ignoring: %m"); |
ff0af2a1 LP |
1550 | log_close(); |
1551 | } else if (r < 0) { | |
1552 | *exit_status = EXIT_OOM_ADJUST; | |
d35fbf6b | 1553 | return -errno; |
613b411c | 1554 | } |
d35fbf6b DM |
1555 | } |
1556 | ||
1557 | if (context->nice_set) | |
1558 | if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) { | |
ff0af2a1 | 1559 | *exit_status = EXIT_NICE; |
d35fbf6b | 1560 | return -errno; |
613b411c LP |
1561 | } |
1562 | ||
d35fbf6b DM |
1563 | if (context->cpu_sched_set) { |
1564 | struct sched_param param = { | |
1565 | .sched_priority = context->cpu_sched_priority, | |
1566 | }; | |
1567 | ||
ff0af2a1 LP |
1568 | r = sched_setscheduler(0, |
1569 | context->cpu_sched_policy | | |
1570 | (context->cpu_sched_reset_on_fork ? | |
1571 | SCHED_RESET_ON_FORK : 0), | |
1572 | ¶m); | |
1573 | if (r < 0) { | |
1574 | *exit_status = EXIT_SETSCHEDULER; | |
d35fbf6b | 1575 | return -errno; |
fc9b2a84 | 1576 | } |
d35fbf6b | 1577 | } |
fc9b2a84 | 1578 | |
d35fbf6b DM |
1579 | if (context->cpuset) |
1580 | if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) { | |
ff0af2a1 | 1581 | *exit_status = EXIT_CPUAFFINITY; |
d35fbf6b | 1582 | return -errno; |
034c6ed7 LP |
1583 | } |
1584 | ||
d35fbf6b DM |
1585 | if (context->ioprio_set) |
1586 | if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) { | |
ff0af2a1 | 1587 | *exit_status = EXIT_IOPRIO; |
d35fbf6b DM |
1588 | return -errno; |
1589 | } | |
da726a4d | 1590 | |
d35fbf6b DM |
1591 | if (context->timer_slack_nsec != NSEC_INFINITY) |
1592 | if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) { | |
ff0af2a1 | 1593 | *exit_status = EXIT_TIMERSLACK; |
d35fbf6b | 1594 | return -errno; |
4c2630eb | 1595 | } |
9eba9da4 | 1596 | |
050f7277 | 1597 | if (context->personality != PERSONALITY_INVALID) |
d35fbf6b | 1598 | if (personality(context->personality) < 0) { |
ff0af2a1 | 1599 | *exit_status = EXIT_PERSONALITY; |
d35fbf6b | 1600 | return -errno; |
4c2630eb | 1601 | } |
94f04347 | 1602 | |
d35fbf6b | 1603 | if (context->utmp_id) |
023a4f67 LP |
1604 | utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path, |
1605 | context->utmp_mode == EXEC_UTMP_INIT ? INIT_PROCESS : | |
1606 | context->utmp_mode == EXEC_UTMP_LOGIN ? LOGIN_PROCESS : | |
1607 | USER_PROCESS, | |
1608 | username ? "root" : context->user); | |
d35fbf6b | 1609 | |
524daa8c | 1610 | if (context->user && is_terminal_input(context->std_input)) { |
ff0af2a1 LP |
1611 | r = chown_terminal(STDIN_FILENO, uid); |
1612 | if (r < 0) { | |
1613 | *exit_status = EXIT_STDIN; | |
1614 | return r; | |
071830ff | 1615 | } |
d35fbf6b | 1616 | } |
8e274523 | 1617 | |
e44da745 | 1618 | if (params->bus_endpoint_fd >= 0 && context->bus_endpoint) { |
fed1e721 | 1619 | uid_t ep_uid = (uid == UID_INVALID) ? 0 : uid; |
e44da745 | 1620 | |
ff0af2a1 LP |
1621 | r = bus_kernel_set_endpoint_policy(params->bus_endpoint_fd, ep_uid, context->bus_endpoint); |
1622 | if (r < 0) { | |
1623 | *exit_status = EXIT_BUS_ENDPOINT; | |
1624 | return r; | |
e44da745 DM |
1625 | } |
1626 | } | |
e44da745 | 1627 | |
a931ad47 LP |
1628 | /* If delegation is enabled we'll pass ownership of the cgroup |
1629 | * (but only in systemd's own controller hierarchy!) to the | |
1630 | * user of the new process. */ | |
1631 | if (params->cgroup_path && context->user && params->cgroup_delegate) { | |
ff0af2a1 LP |
1632 | r = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0644, uid, gid); |
1633 | if (r < 0) { | |
1634 | *exit_status = EXIT_CGROUP; | |
1635 | return r; | |
d35fbf6b | 1636 | } |
034c6ed7 | 1637 | |
034c6ed7 | 1638 | |
ff0af2a1 LP |
1639 | r = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0755, uid, gid); |
1640 | if (r < 0) { | |
1641 | *exit_status = EXIT_CGROUP; | |
1642 | return r; | |
034c6ed7 | 1643 | } |
d35fbf6b | 1644 | } |
034c6ed7 | 1645 | |
d35fbf6b DM |
1646 | if (!strv_isempty(context->runtime_directory) && params->runtime_prefix) { |
1647 | char **rt; | |
fb33a393 | 1648 | |
d35fbf6b DM |
1649 | STRV_FOREACH(rt, context->runtime_directory) { |
1650 | _cleanup_free_ char *p; | |
94f04347 | 1651 | |
d35fbf6b DM |
1652 | p = strjoin(params->runtime_prefix, "/", *rt, NULL); |
1653 | if (!p) { | |
ff0af2a1 | 1654 | *exit_status = EXIT_RUNTIME_DIRECTORY; |
d35fbf6b | 1655 | return -ENOMEM; |
94f04347 | 1656 | } |
94f04347 | 1657 | |
6bfe5c28 LP |
1658 | r = mkdir_p_label(p, context->runtime_directory_mode); |
1659 | if (r < 0) { | |
1660 | *exit_status = EXIT_RUNTIME_DIRECTORY; | |
1661 | return r; | |
1662 | } | |
1663 | ||
1664 | r = chmod_and_chown(p, context->runtime_directory_mode, uid, gid); | |
ff0af2a1 LP |
1665 | if (r < 0) { |
1666 | *exit_status = EXIT_RUNTIME_DIRECTORY; | |
1667 | return r; | |
94f04347 | 1668 | } |
d35fbf6b DM |
1669 | } |
1670 | } | |
94f04347 | 1671 | |
b213e1c1 SW |
1672 | umask(context->umask); |
1673 | ||
d35fbf6b | 1674 | if (params->apply_permissions) { |
ff0af2a1 LP |
1675 | r = enforce_groups(context, username, gid); |
1676 | if (r < 0) { | |
1677 | *exit_status = EXIT_GROUP; | |
1678 | return r; | |
d35fbf6b | 1679 | } |
6bf6e43e | 1680 | #ifdef HAVE_SMACK |
6bf6e43e SW |
1681 | if (context->smack_process_label) { |
1682 | r = mac_smack_apply_pid(0, context->smack_process_label); | |
1683 | if (r < 0) { | |
1684 | *exit_status = EXIT_SMACK_PROCESS_LABEL; | |
1685 | return r; | |
1686 | } | |
1687 | } | |
1688 | #ifdef SMACK_DEFAULT_PROCESS_LABEL | |
1689 | else { | |
1690 | _cleanup_free_ char *exec_label = NULL; | |
1691 | ||
1692 | r = mac_smack_read(command->path, SMACK_ATTR_EXEC, &exec_label); | |
1693 | if (r < 0 && r != -ENODATA && r != -EOPNOTSUPP) { | |
1694 | *exit_status = EXIT_SMACK_PROCESS_LABEL; | |
1695 | return r; | |
1696 | } | |
1697 | ||
1698 | r = mac_smack_apply_pid(0, exec_label ? : SMACK_DEFAULT_PROCESS_LABEL); | |
1699 | if (r < 0) { | |
1700 | *exit_status = EXIT_SMACK_PROCESS_LABEL; | |
1701 | return r; | |
1702 | } | |
1703 | } | |
6bf6e43e SW |
1704 | #endif |
1705 | #endif | |
d35fbf6b | 1706 | #ifdef HAVE_PAM |
b213e1c1 SW |
1707 | if (context->pam_name && username) { |
1708 | r = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds); | |
1709 | if (r < 0) { | |
1710 | *exit_status = EXIT_PAM; | |
1711 | return r; | |
1712 | } | |
d35fbf6b | 1713 | } |
d35fbf6b | 1714 | #endif |
b213e1c1 | 1715 | } |
ac45f971 | 1716 | |
d35fbf6b | 1717 | if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) { |
ff0af2a1 LP |
1718 | r = setup_netns(runtime->netns_storage_socket); |
1719 | if (r < 0) { | |
1720 | *exit_status = EXIT_NETWORK; | |
1721 | return r; | |
d35fbf6b DM |
1722 | } |
1723 | } | |
169c1bda | 1724 | |
ee818b89 AC |
1725 | needs_mount_namespace = exec_needs_mount_namespace(context, params, runtime); |
1726 | ||
1727 | if (needs_mount_namespace) { | |
d35fbf6b DM |
1728 | char *tmp = NULL, *var = NULL; |
1729 | ||
1730 | /* The runtime struct only contains the parent | |
1731 | * of the private /tmp, which is | |
1732 | * non-accessible to world users. Inside of it | |
1733 | * there's a /tmp that is sticky, and that's | |
1734 | * the one we want to use here. */ | |
1735 | ||
1736 | if (context->private_tmp && runtime) { | |
1737 | if (runtime->tmp_dir) | |
63c372cb | 1738 | tmp = strjoina(runtime->tmp_dir, "/tmp"); |
d35fbf6b | 1739 | if (runtime->var_tmp_dir) |
63c372cb | 1740 | var = strjoina(runtime->var_tmp_dir, "/tmp"); |
d35fbf6b | 1741 | } |
d8b4e2e9 | 1742 | |
ff0af2a1 | 1743 | r = setup_namespace( |
ee818b89 | 1744 | params->apply_chroot ? context->root_directory : NULL, |
d35fbf6b DM |
1745 | context->read_write_dirs, |
1746 | context->read_only_dirs, | |
1747 | context->inaccessible_dirs, | |
1748 | tmp, | |
1749 | var, | |
e44da745 | 1750 | params->bus_endpoint_path, |
d35fbf6b DM |
1751 | context->private_devices, |
1752 | context->protect_home, | |
1753 | context->protect_system, | |
1754 | context->mount_flags); | |
0015ebf3 | 1755 | |
ff0af2a1 LP |
1756 | /* If we couldn't set up the namespace this is |
1757 | * probably due to a missing capability. In this case, | |
1758 | * silently proceeed. */ | |
1759 | if (r == -EPERM || r == -EACCES) { | |
1760 | log_open(); | |
f2341e0a | 1761 | log_unit_debug_errno(unit, r, "Failed to set up namespace, assuming containerized execution, ignoring: %m"); |
ff0af2a1 LP |
1762 | log_close(); |
1763 | } else if (r < 0) { | |
1764 | *exit_status = EXIT_NAMESPACE; | |
1765 | return r; | |
81a2b7ce | 1766 | } |
d35fbf6b | 1767 | } |
81a2b7ce | 1768 | |
5f5d8eab LP |
1769 | if (context->working_directory_home) |
1770 | wd = home; | |
1771 | else if (context->working_directory) | |
1772 | wd = context->working_directory; | |
1773 | else | |
1774 | wd = "/"; | |
1775 | ||
d35fbf6b | 1776 | if (params->apply_chroot) { |
ee818b89 | 1777 | if (!needs_mount_namespace && context->root_directory) |
d35fbf6b | 1778 | if (chroot(context->root_directory) < 0) { |
ff0af2a1 | 1779 | *exit_status = EXIT_CHROOT; |
d35fbf6b | 1780 | return -errno; |
8aa75193 LP |
1781 | } |
1782 | ||
5f5d8eab | 1783 | if (chdir(wd) < 0 && |
4c08c824 | 1784 | !context->working_directory_missing_ok) { |
ff0af2a1 | 1785 | *exit_status = EXIT_CHDIR; |
d35fbf6b DM |
1786 | return -errno; |
1787 | } | |
1788 | } else { | |
5f5d8eab | 1789 | const char *d; |
8aa75193 | 1790 | |
5f5d8eab | 1791 | d = strjoina(strempty(context->root_directory), "/", strempty(wd)); |
cf1d0302 LP |
1792 | if (chdir(d) < 0 && |
1793 | !context->working_directory_missing_ok) { | |
ff0af2a1 | 1794 | *exit_status = EXIT_CHDIR; |
d35fbf6b DM |
1795 | return -errno; |
1796 | } | |
1797 | } | |
e66cf1a3 | 1798 | |
9008e1ac MS |
1799 | #ifdef HAVE_SELINUX |
1800 | if (params->apply_permissions && mac_selinux_use() && params->selinux_context_net && socket_fd >= 0) { | |
ff0af2a1 LP |
1801 | r = mac_selinux_get_child_mls_label(socket_fd, command->path, context->selinux_context, &mac_selinux_context_net); |
1802 | if (r < 0) { | |
1803 | *exit_status = EXIT_SELINUX_CONTEXT; | |
1804 | return r; | |
9008e1ac MS |
1805 | } |
1806 | } | |
1807 | #endif | |
1808 | ||
d35fbf6b DM |
1809 | /* We repeat the fd closing here, to make sure that |
1810 | * nothing is leaked from the PAM modules. Note that | |
1811 | * we are more aggressive this time since socket_fd | |
e44da745 DM |
1812 | * and the netns fds we don't need anymore. The custom |
1813 | * endpoint fd was needed to upload the policy and can | |
1814 | * now be closed as well. */ | |
ff0af2a1 LP |
1815 | r = close_all_fds(fds, n_fds); |
1816 | if (r >= 0) | |
1817 | r = shift_fds(fds, n_fds); | |
1818 | if (r >= 0) | |
1819 | r = flags_fds(fds, n_fds, context->non_blocking); | |
1820 | if (r < 0) { | |
1821 | *exit_status = EXIT_FDS; | |
1822 | return r; | |
d35fbf6b | 1823 | } |
e66cf1a3 | 1824 | |
d35fbf6b | 1825 | if (params->apply_permissions) { |
e66cf1a3 | 1826 | |
d35fbf6b DM |
1827 | for (i = 0; i < _RLIMIT_MAX; i++) { |
1828 | if (!context->rlimit[i]) | |
1829 | continue; | |
1830 | ||
1831 | if (setrlimit_closest(i, context->rlimit[i]) < 0) { | |
ff0af2a1 | 1832 | *exit_status = EXIT_LIMITS; |
d35fbf6b | 1833 | return -errno; |
e66cf1a3 LP |
1834 | } |
1835 | } | |
1836 | ||
d35fbf6b | 1837 | if (context->capability_bounding_set_drop) { |
ff0af2a1 LP |
1838 | r = capability_bounding_set_drop(context->capability_bounding_set_drop, false); |
1839 | if (r < 0) { | |
1840 | *exit_status = EXIT_CAPABILITIES; | |
1841 | return r; | |
3b8bddde | 1842 | } |
4c2630eb | 1843 | } |
3b8bddde | 1844 | |
d35fbf6b | 1845 | if (context->user) { |
ff0af2a1 LP |
1846 | r = enforce_user(context, uid); |
1847 | if (r < 0) { | |
1848 | *exit_status = EXIT_USER; | |
1849 | return r; | |
5b6319dc LP |
1850 | } |
1851 | } | |
d35fbf6b DM |
1852 | |
1853 | /* PR_GET_SECUREBITS is not privileged, while | |
1854 | * PR_SET_SECUREBITS is. So to suppress | |
1855 | * potential EPERMs we'll try not to call | |
1856 | * PR_SET_SECUREBITS unless necessary. */ | |
1857 | if (prctl(PR_GET_SECUREBITS) != context->secure_bits) | |
1858 | if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) { | |
ff0af2a1 | 1859 | *exit_status = EXIT_SECUREBITS; |
d35fbf6b | 1860 | return -errno; |
ff01d048 | 1861 | } |
5b6319dc | 1862 | |
d35fbf6b DM |
1863 | if (context->capabilities) |
1864 | if (cap_set_proc(context->capabilities) < 0) { | |
ff0af2a1 | 1865 | *exit_status = EXIT_CAPABILITIES; |
d35fbf6b | 1866 | return -errno; |
613b411c LP |
1867 | } |
1868 | ||
d35fbf6b DM |
1869 | if (context->no_new_privileges) |
1870 | if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) { | |
ff0af2a1 | 1871 | *exit_status = EXIT_NO_NEW_PRIVILEGES; |
d35fbf6b DM |
1872 | return -errno; |
1873 | } | |
1874 | ||
1875 | #ifdef HAVE_SECCOMP | |
1876 | if (context->address_families_whitelist || | |
1877 | !set_isempty(context->address_families)) { | |
ff0af2a1 LP |
1878 | r = apply_address_families(context); |
1879 | if (r < 0) { | |
1880 | *exit_status = EXIT_ADDRESS_FAMILIES; | |
1881 | return r; | |
4c2630eb MS |
1882 | } |
1883 | } | |
04aa0cb9 | 1884 | |
d35fbf6b DM |
1885 | if (context->syscall_whitelist || |
1886 | !set_isempty(context->syscall_filter) || | |
1887 | !set_isempty(context->syscall_archs)) { | |
ff0af2a1 LP |
1888 | r = apply_seccomp(context); |
1889 | if (r < 0) { | |
1890 | *exit_status = EXIT_SECCOMP; | |
1891 | return r; | |
81a2b7ce | 1892 | } |
d35fbf6b DM |
1893 | } |
1894 | #endif | |
81a2b7ce | 1895 | |
d35fbf6b | 1896 | #ifdef HAVE_SELINUX |
6baa7db0 | 1897 | if (mac_selinux_use()) { |
9008e1ac | 1898 | char *exec_context = mac_selinux_context_net ?: context->selinux_context; |
16115b0a | 1899 | |
9008e1ac | 1900 | if (exec_context) { |
ff0af2a1 LP |
1901 | r = setexeccon(exec_context); |
1902 | if (r < 0) { | |
1903 | *exit_status = EXIT_SELINUX_CONTEXT; | |
1904 | return r; | |
16115b0a | 1905 | } |
81a2b7ce | 1906 | } |
81a2b7ce | 1907 | } |
d35fbf6b | 1908 | #endif |
81a2b7ce | 1909 | |
d35fbf6b | 1910 | #ifdef HAVE_APPARMOR |
6baa7db0 | 1911 | if (context->apparmor_profile && mac_apparmor_use()) { |
ff0af2a1 LP |
1912 | r = aa_change_onexec(context->apparmor_profile); |
1913 | if (r < 0 && !context->apparmor_profile_ignore) { | |
1914 | *exit_status = EXIT_APPARMOR_PROFILE; | |
5482192e | 1915 | return -errno; |
d35fbf6b | 1916 | } |
034c6ed7 | 1917 | } |
d35fbf6b DM |
1918 | #endif |
1919 | } | |
034c6ed7 | 1920 | |
8dd4c05b | 1921 | r = build_environment(context, n_fds, params->fd_names, params->watchdog_usec, home, username, shell, &our_env); |
ff0af2a1 LP |
1922 | if (r < 0) { |
1923 | *exit_status = EXIT_MEMORY; | |
1924 | return r; | |
d35fbf6b | 1925 | } |
034c6ed7 | 1926 | |
d35fbf6b DM |
1927 | final_env = strv_env_merge(5, |
1928 | params->environment, | |
1929 | our_env, | |
1930 | context->environment, | |
1931 | files_env, | |
1932 | pam_env, | |
1933 | NULL); | |
1934 | if (!final_env) { | |
ff0af2a1 | 1935 | *exit_status = EXIT_MEMORY; |
d35fbf6b DM |
1936 | return -ENOMEM; |
1937 | } | |
81a2b7ce | 1938 | |
d35fbf6b DM |
1939 | final_argv = replace_env_argv(argv, final_env); |
1940 | if (!final_argv) { | |
ff0af2a1 | 1941 | *exit_status = EXIT_MEMORY; |
d35fbf6b DM |
1942 | return -ENOMEM; |
1943 | } | |
034c6ed7 | 1944 | |
d35fbf6b | 1945 | final_env = strv_env_clean(final_env); |
260abb78 | 1946 | |
553d2243 | 1947 | if (_unlikely_(log_get_max_level() >= LOG_DEBUG)) { |
d35fbf6b | 1948 | _cleanup_free_ char *line; |
81a2b7ce | 1949 | |
d35fbf6b DM |
1950 | line = exec_command_line(final_argv); |
1951 | if (line) { | |
1952 | log_open(); | |
f2341e0a LP |
1953 | log_struct(LOG_DEBUG, |
1954 | LOG_UNIT_ID(unit), | |
1955 | "EXECUTABLE=%s", command->path, | |
1956 | LOG_UNIT_MESSAGE(unit, "Executing: %s", line), | |
1957 | NULL); | |
d35fbf6b DM |
1958 | log_close(); |
1959 | } | |
1960 | } | |
dd305ec9 | 1961 | |
d35fbf6b | 1962 | execve(command->path, final_argv, final_env); |
ff0af2a1 | 1963 | *exit_status = EXIT_EXEC; |
d35fbf6b DM |
1964 | return -errno; |
1965 | } | |
81a2b7ce | 1966 | |
f2341e0a LP |
1967 | int exec_spawn(Unit *unit, |
1968 | ExecCommand *command, | |
d35fbf6b DM |
1969 | const ExecContext *context, |
1970 | const ExecParameters *params, | |
1971 | ExecRuntime *runtime, | |
1972 | pid_t *ret) { | |
8351ceae | 1973 | |
d35fbf6b DM |
1974 | _cleanup_strv_free_ char **files_env = NULL; |
1975 | int *fds = NULL; unsigned n_fds = 0; | |
ff0af2a1 LP |
1976 | _cleanup_free_ char *line = NULL; |
1977 | int socket_fd, r; | |
1978 | char **argv; | |
d35fbf6b | 1979 | pid_t pid; |
8351ceae | 1980 | |
f2341e0a | 1981 | assert(unit); |
d35fbf6b DM |
1982 | assert(command); |
1983 | assert(context); | |
1984 | assert(ret); | |
1985 | assert(params); | |
1986 | assert(params->fds || params->n_fds <= 0); | |
4298d0b5 | 1987 | |
d35fbf6b DM |
1988 | if (context->std_input == EXEC_INPUT_SOCKET || |
1989 | context->std_output == EXEC_OUTPUT_SOCKET || | |
1990 | context->std_error == EXEC_OUTPUT_SOCKET) { | |
17df7223 | 1991 | |
ff0af2a1 | 1992 | if (params->n_fds != 1) { |
f2341e0a | 1993 | log_unit_error(unit, "Got more than one socket."); |
d35fbf6b | 1994 | return -EINVAL; |
ff0af2a1 | 1995 | } |
eef65bf3 | 1996 | |
d35fbf6b DM |
1997 | socket_fd = params->fds[0]; |
1998 | } else { | |
1999 | socket_fd = -1; | |
2000 | fds = params->fds; | |
2001 | n_fds = params->n_fds; | |
2002 | } | |
94f04347 | 2003 | |
f2341e0a | 2004 | r = exec_context_load_environment(unit, context, &files_env); |
ff0af2a1 | 2005 | if (r < 0) |
f2341e0a | 2006 | return log_unit_error_errno(unit, r, "Failed to load environment files: %m"); |
034c6ed7 | 2007 | |
d35fbf6b | 2008 | argv = params->argv ?: command->argv; |
d35fbf6b DM |
2009 | line = exec_command_line(argv); |
2010 | if (!line) | |
2011 | return log_oom(); | |
fab56fc5 | 2012 | |
f2341e0a LP |
2013 | log_struct(LOG_DEBUG, |
2014 | LOG_UNIT_ID(unit), | |
2015 | LOG_UNIT_MESSAGE(unit, "About to execute: %s", line), | |
2016 | "EXECUTABLE=%s", command->path, | |
2017 | NULL); | |
d35fbf6b DM |
2018 | pid = fork(); |
2019 | if (pid < 0) | |
f2341e0a | 2020 | return log_unit_error_errno(unit, r, "Failed to fork: %m"); |
d35fbf6b DM |
2021 | |
2022 | if (pid == 0) { | |
ff0af2a1 LP |
2023 | int exit_status; |
2024 | ||
f2341e0a LP |
2025 | r = exec_child(unit, |
2026 | command, | |
ff0af2a1 LP |
2027 | context, |
2028 | params, | |
2029 | runtime, | |
2030 | argv, | |
2031 | socket_fd, | |
2032 | fds, n_fds, | |
2033 | files_env, | |
2034 | &exit_status); | |
2035 | if (r < 0) { | |
4c2630eb | 2036 | log_open(); |
f2341e0a LP |
2037 | log_struct_errno(LOG_ERR, r, |
2038 | LOG_MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED), | |
2039 | LOG_UNIT_ID(unit), | |
2040 | LOG_UNIT_MESSAGE(unit, "Failed at step %s spawning %s: %m", | |
2041 | exit_status_to_string(exit_status, EXIT_STATUS_SYSTEMD), | |
2042 | command->path), | |
2043 | "EXECUTABLE=%s", command->path, | |
2044 | NULL); | |
4c2630eb MS |
2045 | } |
2046 | ||
ff0af2a1 | 2047 | _exit(exit_status); |
034c6ed7 LP |
2048 | } |
2049 | ||
f2341e0a | 2050 | log_unit_debug(unit, "Forked %s as "PID_FMT, command->path, pid); |
23635a85 | 2051 | |
80876c20 LP |
2052 | /* We add the new process to the cgroup both in the child (so |
2053 | * that we can be sure that no user code is ever executed | |
2054 | * outside of the cgroup) and in the parent (so that we can be | |
2055 | * sure that when we kill the cgroup the process will be | |
2056 | * killed too). */ | |
d35fbf6b | 2057 | if (params->cgroup_path) |
dd305ec9 | 2058 | (void) cg_attach(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, pid); |
2da3263a | 2059 | |
b58b4116 | 2060 | exec_status_start(&command->exec_status, pid); |
9fb86720 | 2061 | |
034c6ed7 | 2062 | *ret = pid; |
5cb5a6ff LP |
2063 | return 0; |
2064 | } | |
2065 | ||
034c6ed7 LP |
2066 | void exec_context_init(ExecContext *c) { |
2067 | assert(c); | |
2068 | ||
4c12626c | 2069 | c->umask = 0022; |
9eba9da4 | 2070 | c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0); |
94f04347 | 2071 | c->cpu_sched_policy = SCHED_OTHER; |
071830ff | 2072 | c->syslog_priority = LOG_DAEMON|LOG_INFO; |
74922904 | 2073 | c->syslog_level_prefix = true; |
353e12c2 | 2074 | c->ignore_sigpipe = true; |
3a43da28 | 2075 | c->timer_slack_nsec = NSEC_INFINITY; |
050f7277 | 2076 | c->personality = PERSONALITY_INVALID; |
e66cf1a3 | 2077 | c->runtime_directory_mode = 0755; |
034c6ed7 LP |
2078 | } |
2079 | ||
613b411c | 2080 | void exec_context_done(ExecContext *c) { |
5cb5a6ff LP |
2081 | unsigned l; |
2082 | ||
2083 | assert(c); | |
2084 | ||
6796073e LP |
2085 | c->environment = strv_free(c->environment); |
2086 | c->environment_files = strv_free(c->environment_files); | |
8c7be95e | 2087 | |
1f6b4113 | 2088 | for (l = 0; l < ELEMENTSOF(c->rlimit); l++) |
a1e58e8e | 2089 | c->rlimit[l] = mfree(c->rlimit[l]); |
034c6ed7 | 2090 | |
a1e58e8e LP |
2091 | c->working_directory = mfree(c->working_directory); |
2092 | c->root_directory = mfree(c->root_directory); | |
2093 | c->tty_path = mfree(c->tty_path); | |
2094 | c->syslog_identifier = mfree(c->syslog_identifier); | |
2095 | c->user = mfree(c->user); | |
2096 | c->group = mfree(c->group); | |
034c6ed7 | 2097 | |
6796073e | 2098 | c->supplementary_groups = strv_free(c->supplementary_groups); |
94f04347 | 2099 | |
a1e58e8e | 2100 | c->pam_name = mfree(c->pam_name); |
5b6319dc | 2101 | |
94f04347 LP |
2102 | if (c->capabilities) { |
2103 | cap_free(c->capabilities); | |
2104 | c->capabilities = NULL; | |
2105 | } | |
15ae422b | 2106 | |
6796073e LP |
2107 | c->read_only_dirs = strv_free(c->read_only_dirs); |
2108 | c->read_write_dirs = strv_free(c->read_write_dirs); | |
2109 | c->inaccessible_dirs = strv_free(c->inaccessible_dirs); | |
82c121a4 LP |
2110 | |
2111 | if (c->cpuset) | |
2112 | CPU_FREE(c->cpuset); | |
86a3475b | 2113 | |
a1e58e8e LP |
2114 | c->utmp_id = mfree(c->utmp_id); |
2115 | c->selinux_context = mfree(c->selinux_context); | |
2116 | c->apparmor_profile = mfree(c->apparmor_profile); | |
eef65bf3 | 2117 | |
525d3cc7 LP |
2118 | c->syscall_filter = set_free(c->syscall_filter); |
2119 | c->syscall_archs = set_free(c->syscall_archs); | |
2120 | c->address_families = set_free(c->address_families); | |
e66cf1a3 | 2121 | |
6796073e | 2122 | c->runtime_directory = strv_free(c->runtime_directory); |
bb7dd0b0 DM |
2123 | |
2124 | bus_endpoint_free(c->bus_endpoint); | |
2125 | c->bus_endpoint = NULL; | |
e66cf1a3 LP |
2126 | } |
2127 | ||
2128 | int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) { | |
2129 | char **i; | |
2130 | ||
2131 | assert(c); | |
2132 | ||
2133 | if (!runtime_prefix) | |
2134 | return 0; | |
2135 | ||
2136 | STRV_FOREACH(i, c->runtime_directory) { | |
2137 | _cleanup_free_ char *p; | |
2138 | ||
2139 | p = strjoin(runtime_prefix, "/", *i, NULL); | |
2140 | if (!p) | |
2141 | return -ENOMEM; | |
2142 | ||
2143 | /* We execute this synchronously, since we need to be | |
2144 | * sure this is gone when we start the service | |
2145 | * next. */ | |
c6878637 | 2146 | (void) rm_rf(p, REMOVE_ROOT); |
e66cf1a3 LP |
2147 | } |
2148 | ||
2149 | return 0; | |
5cb5a6ff LP |
2150 | } |
2151 | ||
43d0fcbd LP |
2152 | void exec_command_done(ExecCommand *c) { |
2153 | assert(c); | |
2154 | ||
a1e58e8e | 2155 | c->path = mfree(c->path); |
43d0fcbd | 2156 | |
6796073e | 2157 | c->argv = strv_free(c->argv); |
43d0fcbd LP |
2158 | } |
2159 | ||
2160 | void exec_command_done_array(ExecCommand *c, unsigned n) { | |
2161 | unsigned i; | |
2162 | ||
2163 | for (i = 0; i < n; i++) | |
2164 | exec_command_done(c+i); | |
2165 | } | |
2166 | ||
f1acf85a | 2167 | ExecCommand* exec_command_free_list(ExecCommand *c) { |
5cb5a6ff LP |
2168 | ExecCommand *i; |
2169 | ||
2170 | while ((i = c)) { | |
71fda00f | 2171 | LIST_REMOVE(command, c, i); |
43d0fcbd | 2172 | exec_command_done(i); |
5cb5a6ff LP |
2173 | free(i); |
2174 | } | |
f1acf85a ZJS |
2175 | |
2176 | return NULL; | |
5cb5a6ff LP |
2177 | } |
2178 | ||
034c6ed7 LP |
2179 | void exec_command_free_array(ExecCommand **c, unsigned n) { |
2180 | unsigned i; | |
2181 | ||
f1acf85a ZJS |
2182 | for (i = 0; i < n; i++) |
2183 | c[i] = exec_command_free_list(c[i]); | |
034c6ed7 LP |
2184 | } |
2185 | ||
039f0e70 | 2186 | typedef struct InvalidEnvInfo { |
f2341e0a | 2187 | Unit *unit; |
039f0e70 LP |
2188 | const char *path; |
2189 | } InvalidEnvInfo; | |
2190 | ||
2191 | static void invalid_env(const char *p, void *userdata) { | |
2192 | InvalidEnvInfo *info = userdata; | |
2193 | ||
f2341e0a | 2194 | log_unit_error(info->unit, "Ignoring invalid environment assignment '%s': %s", p, info->path); |
039f0e70 LP |
2195 | } |
2196 | ||
f2341e0a | 2197 | int exec_context_load_environment(Unit *unit, const ExecContext *c, char ***l) { |
8c7be95e LP |
2198 | char **i, **r = NULL; |
2199 | ||
2200 | assert(c); | |
2201 | assert(l); | |
2202 | ||
2203 | STRV_FOREACH(i, c->environment_files) { | |
2204 | char *fn; | |
2205 | int k; | |
2206 | bool ignore = false; | |
2207 | char **p; | |
7fd1b19b | 2208 | _cleanup_globfree_ glob_t pglob = {}; |
2bef10ab | 2209 | int count, n; |
8c7be95e LP |
2210 | |
2211 | fn = *i; | |
2212 | ||
2213 | if (fn[0] == '-') { | |
2214 | ignore = true; | |
2215 | fn ++; | |
2216 | } | |
2217 | ||
2218 | if (!path_is_absolute(fn)) { | |
8c7be95e LP |
2219 | if (ignore) |
2220 | continue; | |
2221 | ||
2222 | strv_free(r); | |
2223 | return -EINVAL; | |
2224 | } | |
2225 | ||
2bef10ab | 2226 | /* Filename supports globbing, take all matching files */ |
2bef10ab PL |
2227 | errno = 0; |
2228 | if (glob(fn, 0, NULL, &pglob) != 0) { | |
2bef10ab PL |
2229 | if (ignore) |
2230 | continue; | |
8c7be95e | 2231 | |
2bef10ab PL |
2232 | strv_free(r); |
2233 | return errno ? -errno : -EINVAL; | |
2234 | } | |
2235 | count = pglob.gl_pathc; | |
2236 | if (count == 0) { | |
8c7be95e LP |
2237 | if (ignore) |
2238 | continue; | |
2239 | ||
2240 | strv_free(r); | |
2bef10ab | 2241 | return -EINVAL; |
8c7be95e | 2242 | } |
2bef10ab | 2243 | for (n = 0; n < count; n++) { |
717603e3 | 2244 | k = load_env_file(NULL, pglob.gl_pathv[n], NULL, &p); |
2bef10ab PL |
2245 | if (k < 0) { |
2246 | if (ignore) | |
2247 | continue; | |
8c7be95e | 2248 | |
2bef10ab | 2249 | strv_free(r); |
2bef10ab | 2250 | return k; |
e9c1ea9d | 2251 | } |
ebc05a09 | 2252 | /* Log invalid environment variables with filename */ |
039f0e70 LP |
2253 | if (p) { |
2254 | InvalidEnvInfo info = { | |
f2341e0a | 2255 | .unit = unit, |
039f0e70 LP |
2256 | .path = pglob.gl_pathv[n] |
2257 | }; | |
2258 | ||
2259 | p = strv_env_clean_with_callback(p, invalid_env, &info); | |
2260 | } | |
8c7be95e | 2261 | |
2bef10ab PL |
2262 | if (r == NULL) |
2263 | r = p; | |
2264 | else { | |
2265 | char **m; | |
8c7be95e | 2266 | |
2bef10ab PL |
2267 | m = strv_env_merge(2, r, p); |
2268 | strv_free(r); | |
2269 | strv_free(p); | |
c84a9488 | 2270 | if (!m) |
2bef10ab | 2271 | return -ENOMEM; |
2bef10ab PL |
2272 | |
2273 | r = m; | |
2274 | } | |
8c7be95e LP |
2275 | } |
2276 | } | |
2277 | ||
2278 | *l = r; | |
2279 | ||
2280 | return 0; | |
2281 | } | |
2282 | ||
6ac8fdc9 | 2283 | static bool tty_may_match_dev_console(const char *tty) { |
e1d75803 | 2284 | _cleanup_free_ char *active = NULL; |
7d6884b6 | 2285 | char *console; |
6ac8fdc9 MS |
2286 | |
2287 | if (startswith(tty, "/dev/")) | |
2288 | tty += 5; | |
2289 | ||
2290 | /* trivial identity? */ | |
2291 | if (streq(tty, "console")) | |
2292 | return true; | |
2293 | ||
2294 | console = resolve_dev_console(&active); | |
2295 | /* if we could not resolve, assume it may */ | |
2296 | if (!console) | |
2297 | return true; | |
2298 | ||
2299 | /* "tty0" means the active VC, so it may be the same sometimes */ | |
e1d75803 | 2300 | return streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty)); |
6ac8fdc9 MS |
2301 | } |
2302 | ||
2303 | bool exec_context_may_touch_console(ExecContext *ec) { | |
2304 | return (ec->tty_reset || ec->tty_vhangup || ec->tty_vt_disallocate || | |
2305 | is_terminal_input(ec->std_input) || | |
2306 | is_terminal_output(ec->std_output) || | |
2307 | is_terminal_output(ec->std_error)) && | |
2308 | tty_may_match_dev_console(tty_path(ec)); | |
2309 | } | |
2310 | ||
15ae422b LP |
2311 | static void strv_fprintf(FILE *f, char **l) { |
2312 | char **g; | |
2313 | ||
2314 | assert(f); | |
2315 | ||
2316 | STRV_FOREACH(g, l) | |
2317 | fprintf(f, " %s", *g); | |
2318 | } | |
2319 | ||
5cb5a6ff | 2320 | void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { |
c2bbd90b | 2321 | char **e, **d; |
94f04347 | 2322 | unsigned i; |
9eba9da4 | 2323 | |
5cb5a6ff LP |
2324 | assert(c); |
2325 | assert(f); | |
2326 | ||
4ad49000 | 2327 | prefix = strempty(prefix); |
5cb5a6ff LP |
2328 | |
2329 | fprintf(f, | |
94f04347 LP |
2330 | "%sUMask: %04o\n" |
2331 | "%sWorkingDirectory: %s\n" | |
451a074f | 2332 | "%sRootDirectory: %s\n" |
15ae422b | 2333 | "%sNonBlocking: %s\n" |
64747e2d | 2334 | "%sPrivateTmp: %s\n" |
4819ff03 | 2335 | "%sPrivateNetwork: %s\n" |
7f112f50 | 2336 | "%sPrivateDevices: %s\n" |
1b8689f9 LP |
2337 | "%sProtectHome: %s\n" |
2338 | "%sProtectSystem: %s\n" | |
3bb07b76 | 2339 | "%sIgnoreSIGPIPE: %s\n", |
5cb5a6ff | 2340 | prefix, c->umask, |
9eba9da4 | 2341 | prefix, c->working_directory ? c->working_directory : "/", |
451a074f | 2342 | prefix, c->root_directory ? c->root_directory : "/", |
15ae422b | 2343 | prefix, yes_no(c->non_blocking), |
64747e2d | 2344 | prefix, yes_no(c->private_tmp), |
4819ff03 | 2345 | prefix, yes_no(c->private_network), |
7f112f50 | 2346 | prefix, yes_no(c->private_devices), |
1b8689f9 LP |
2347 | prefix, protect_home_to_string(c->protect_home), |
2348 | prefix, protect_system_to_string(c->protect_system), | |
3bb07b76 | 2349 | prefix, yes_no(c->ignore_sigpipe)); |
fb33a393 | 2350 | |
8c7be95e LP |
2351 | STRV_FOREACH(e, c->environment) |
2352 | fprintf(f, "%sEnvironment: %s\n", prefix, *e); | |
2353 | ||
2354 | STRV_FOREACH(e, c->environment_files) | |
2355 | fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e); | |
94f04347 | 2356 | |
c2bbd90b EV |
2357 | fprintf(f, "%sRuntimeDirectoryMode: %04o\n", prefix, c->runtime_directory_mode); |
2358 | ||
2359 | STRV_FOREACH(d, c->runtime_directory) | |
2360 | fprintf(f, "%sRuntimeDirectory: %s\n", prefix, *d); | |
2361 | ||
fb33a393 LP |
2362 | if (c->nice_set) |
2363 | fprintf(f, | |
2364 | "%sNice: %i\n", | |
2365 | prefix, c->nice); | |
2366 | ||
dd6c17b1 | 2367 | if (c->oom_score_adjust_set) |
fb33a393 | 2368 | fprintf(f, |
dd6c17b1 LP |
2369 | "%sOOMScoreAdjust: %i\n", |
2370 | prefix, c->oom_score_adjust); | |
9eba9da4 | 2371 | |
94f04347 LP |
2372 | for (i = 0; i < RLIM_NLIMITS; i++) |
2373 | if (c->rlimit[i]) | |
de0671ee ZJS |
2374 | fprintf(f, "%s%s: "RLIM_FMT"\n", |
2375 | prefix, rlimit_to_string(i), c->rlimit[i]->rlim_max); | |
94f04347 | 2376 | |
f8b69d1d | 2377 | if (c->ioprio_set) { |
1756a011 | 2378 | _cleanup_free_ char *class_str = NULL; |
f8b69d1d | 2379 | |
1756a011 | 2380 | ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str); |
9eba9da4 LP |
2381 | fprintf(f, |
2382 | "%sIOSchedulingClass: %s\n" | |
2383 | "%sIOPriority: %i\n", | |
f8b69d1d | 2384 | prefix, strna(class_str), |
9eba9da4 | 2385 | prefix, (int) IOPRIO_PRIO_DATA(c->ioprio)); |
f8b69d1d | 2386 | } |
94f04347 | 2387 | |
f8b69d1d | 2388 | if (c->cpu_sched_set) { |
1756a011 | 2389 | _cleanup_free_ char *policy_str = NULL; |
f8b69d1d | 2390 | |
1756a011 | 2391 | sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str); |
94f04347 LP |
2392 | fprintf(f, |
2393 | "%sCPUSchedulingPolicy: %s\n" | |
38b48754 LP |
2394 | "%sCPUSchedulingPriority: %i\n" |
2395 | "%sCPUSchedulingResetOnFork: %s\n", | |
f8b69d1d | 2396 | prefix, strna(policy_str), |
38b48754 LP |
2397 | prefix, c->cpu_sched_priority, |
2398 | prefix, yes_no(c->cpu_sched_reset_on_fork)); | |
b929bf04 | 2399 | } |
94f04347 | 2400 | |
82c121a4 | 2401 | if (c->cpuset) { |
94f04347 | 2402 | fprintf(f, "%sCPUAffinity:", prefix); |
82c121a4 LP |
2403 | for (i = 0; i < c->cpuset_ncpus; i++) |
2404 | if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset)) | |
43a99a7a | 2405 | fprintf(f, " %u", i); |
94f04347 LP |
2406 | fputs("\n", f); |
2407 | } | |
2408 | ||
3a43da28 | 2409 | if (c->timer_slack_nsec != NSEC_INFINITY) |
ccd06097 | 2410 | fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec); |
94f04347 LP |
2411 | |
2412 | fprintf(f, | |
80876c20 LP |
2413 | "%sStandardInput: %s\n" |
2414 | "%sStandardOutput: %s\n" | |
2415 | "%sStandardError: %s\n", | |
2416 | prefix, exec_input_to_string(c->std_input), | |
2417 | prefix, exec_output_to_string(c->std_output), | |
2418 | prefix, exec_output_to_string(c->std_error)); | |
2419 | ||
2420 | if (c->tty_path) | |
2421 | fprintf(f, | |
6ea832a2 LP |
2422 | "%sTTYPath: %s\n" |
2423 | "%sTTYReset: %s\n" | |
2424 | "%sTTYVHangup: %s\n" | |
2425 | "%sTTYVTDisallocate: %s\n", | |
2426 | prefix, c->tty_path, | |
2427 | prefix, yes_no(c->tty_reset), | |
2428 | prefix, yes_no(c->tty_vhangup), | |
2429 | prefix, yes_no(c->tty_vt_disallocate)); | |
94f04347 | 2430 | |
5ce70e5b ZJS |
2431 | if (c->std_output == EXEC_OUTPUT_SYSLOG || |
2432 | c->std_output == EXEC_OUTPUT_KMSG || | |
2433 | c->std_output == EXEC_OUTPUT_JOURNAL || | |
2434 | c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
2435 | c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
2436 | c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE || | |
2437 | c->std_error == EXEC_OUTPUT_SYSLOG || | |
2438 | c->std_error == EXEC_OUTPUT_KMSG || | |
2439 | c->std_error == EXEC_OUTPUT_JOURNAL || | |
2440 | c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
2441 | c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
2442 | c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) { | |
f8b69d1d | 2443 | |
5ce70e5b | 2444 | _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL; |
f8b69d1d | 2445 | |
5ce70e5b ZJS |
2446 | log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str); |
2447 | log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str); | |
f8b69d1d | 2448 | |
94f04347 LP |
2449 | fprintf(f, |
2450 | "%sSyslogFacility: %s\n" | |
2451 | "%sSyslogLevel: %s\n", | |
f8b69d1d MS |
2452 | prefix, strna(fac_str), |
2453 | prefix, strna(lvl_str)); | |
f8b69d1d | 2454 | } |
94f04347 LP |
2455 | |
2456 | if (c->capabilities) { | |
5ce70e5b ZJS |
2457 | _cleanup_cap_free_charp_ char *t; |
2458 | ||
2459 | t = cap_to_text(c->capabilities, NULL); | |
2460 | if (t) | |
2461 | fprintf(f, "%sCapabilities: %s\n", prefix, t); | |
94f04347 LP |
2462 | } |
2463 | ||
2464 | if (c->secure_bits) | |
2465 | fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n", | |
2466 | prefix, | |
cbb21cca ZJS |
2467 | (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "", |
2468 | (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "", | |
2469 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "", | |
2470 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "", | |
2471 | (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "", | |
2472 | (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : ""); | |
94f04347 LP |
2473 | |
2474 | if (c->capability_bounding_set_drop) { | |
ae556c21 | 2475 | unsigned long l; |
260abb78 | 2476 | fprintf(f, "%sCapabilityBoundingSet:", prefix); |
94f04347 | 2477 | |
64685e0c | 2478 | for (l = 0; l <= cap_last_cap(); l++) |
2822da4f LP |
2479 | if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) |
2480 | fprintf(f, " %s", strna(capability_to_name(l))); | |
94f04347 LP |
2481 | |
2482 | fputs("\n", f); | |
2483 | } | |
2484 | ||
2485 | if (c->user) | |
f2d3769a | 2486 | fprintf(f, "%sUser: %s\n", prefix, c->user); |
94f04347 | 2487 | if (c->group) |
f2d3769a | 2488 | fprintf(f, "%sGroup: %s\n", prefix, c->group); |
94f04347 | 2489 | |
15ae422b | 2490 | if (strv_length(c->supplementary_groups) > 0) { |
94f04347 | 2491 | fprintf(f, "%sSupplementaryGroups:", prefix); |
15ae422b LP |
2492 | strv_fprintf(f, c->supplementary_groups); |
2493 | fputs("\n", f); | |
2494 | } | |
94f04347 | 2495 | |
5b6319dc | 2496 | if (c->pam_name) |
f2d3769a | 2497 | fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name); |
5b6319dc | 2498 | |
15ae422b LP |
2499 | if (strv_length(c->read_write_dirs) > 0) { |
2500 | fprintf(f, "%sReadWriteDirs:", prefix); | |
2501 | strv_fprintf(f, c->read_write_dirs); | |
2502 | fputs("\n", f); | |
2503 | } | |
2504 | ||
2505 | if (strv_length(c->read_only_dirs) > 0) { | |
2506 | fprintf(f, "%sReadOnlyDirs:", prefix); | |
2507 | strv_fprintf(f, c->read_only_dirs); | |
2508 | fputs("\n", f); | |
2509 | } | |
94f04347 | 2510 | |
15ae422b LP |
2511 | if (strv_length(c->inaccessible_dirs) > 0) { |
2512 | fprintf(f, "%sInaccessibleDirs:", prefix); | |
2513 | strv_fprintf(f, c->inaccessible_dirs); | |
94f04347 LP |
2514 | fputs("\n", f); |
2515 | } | |
2e22afe9 | 2516 | |
169c1bda LP |
2517 | if (c->utmp_id) |
2518 | fprintf(f, | |
2519 | "%sUtmpIdentifier: %s\n", | |
2520 | prefix, c->utmp_id); | |
7b52a628 MS |
2521 | |
2522 | if (c->selinux_context) | |
2523 | fprintf(f, | |
5f8640fb LP |
2524 | "%sSELinuxContext: %s%s\n", |
2525 | prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context); | |
17df7223 | 2526 | |
050f7277 | 2527 | if (c->personality != PERSONALITY_INVALID) |
ac45f971 LP |
2528 | fprintf(f, |
2529 | "%sPersonality: %s\n", | |
2530 | prefix, strna(personality_to_string(c->personality))); | |
2531 | ||
17df7223 | 2532 | if (c->syscall_filter) { |
351a19b1 | 2533 | #ifdef HAVE_SECCOMP |
17df7223 LP |
2534 | Iterator j; |
2535 | void *id; | |
2536 | bool first = true; | |
351a19b1 | 2537 | #endif |
17df7223 LP |
2538 | |
2539 | fprintf(f, | |
57183d11 | 2540 | "%sSystemCallFilter: ", |
17df7223 LP |
2541 | prefix); |
2542 | ||
2543 | if (!c->syscall_whitelist) | |
2544 | fputc('~', f); | |
2545 | ||
351a19b1 | 2546 | #ifdef HAVE_SECCOMP |
17df7223 LP |
2547 | SET_FOREACH(id, c->syscall_filter, j) { |
2548 | _cleanup_free_ char *name = NULL; | |
2549 | ||
2550 | if (first) | |
2551 | first = false; | |
2552 | else | |
2553 | fputc(' ', f); | |
2554 | ||
57183d11 | 2555 | name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1); |
17df7223 LP |
2556 | fputs(strna(name), f); |
2557 | } | |
351a19b1 | 2558 | #endif |
17df7223 LP |
2559 | |
2560 | fputc('\n', f); | |
2561 | } | |
2562 | ||
57183d11 LP |
2563 | if (c->syscall_archs) { |
2564 | #ifdef HAVE_SECCOMP | |
2565 | Iterator j; | |
2566 | void *id; | |
2567 | #endif | |
2568 | ||
2569 | fprintf(f, | |
2570 | "%sSystemCallArchitectures:", | |
2571 | prefix); | |
2572 | ||
2573 | #ifdef HAVE_SECCOMP | |
2574 | SET_FOREACH(id, c->syscall_archs, j) | |
2575 | fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1))); | |
2576 | #endif | |
2577 | fputc('\n', f); | |
2578 | } | |
2579 | ||
17df7223 LP |
2580 | if (c->syscall_errno != 0) |
2581 | fprintf(f, | |
2582 | "%sSystemCallErrorNumber: %s\n", | |
2583 | prefix, strna(errno_to_name(c->syscall_errno))); | |
eef65bf3 MS |
2584 | |
2585 | if (c->apparmor_profile) | |
2586 | fprintf(f, | |
2587 | "%sAppArmorProfile: %s%s\n", | |
2588 | prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile); | |
5cb5a6ff LP |
2589 | } |
2590 | ||
a931ad47 LP |
2591 | bool exec_context_maintains_privileges(ExecContext *c) { |
2592 | assert(c); | |
2593 | ||
2594 | /* Returns true if the process forked off would run run under | |
2595 | * an unchanged UID or as root. */ | |
2596 | ||
2597 | if (!c->user) | |
2598 | return true; | |
2599 | ||
2600 | if (streq(c->user, "root") || streq(c->user, "0")) | |
2601 | return true; | |
2602 | ||
2603 | return false; | |
2604 | } | |
2605 | ||
b58b4116 | 2606 | void exec_status_start(ExecStatus *s, pid_t pid) { |
034c6ed7 | 2607 | assert(s); |
5cb5a6ff | 2608 | |
b58b4116 LP |
2609 | zero(*s); |
2610 | s->pid = pid; | |
2611 | dual_timestamp_get(&s->start_timestamp); | |
2612 | } | |
2613 | ||
6ea832a2 | 2614 | void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) { |
b58b4116 LP |
2615 | assert(s); |
2616 | ||
0b1f4ae6 | 2617 | if (s->pid && s->pid != pid) |
b58b4116 LP |
2618 | zero(*s); |
2619 | ||
034c6ed7 | 2620 | s->pid = pid; |
63983207 | 2621 | dual_timestamp_get(&s->exit_timestamp); |
9fb86720 | 2622 | |
034c6ed7 LP |
2623 | s->code = code; |
2624 | s->status = status; | |
169c1bda | 2625 | |
6ea832a2 LP |
2626 | if (context) { |
2627 | if (context->utmp_id) | |
2628 | utmp_put_dead_process(context->utmp_id, pid, code, status); | |
2629 | ||
2630 | exec_context_tty_reset(context); | |
2631 | } | |
9fb86720 LP |
2632 | } |
2633 | ||
2634 | void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) { | |
2635 | char buf[FORMAT_TIMESTAMP_MAX]; | |
2636 | ||
2637 | assert(s); | |
2638 | assert(f); | |
2639 | ||
9fb86720 LP |
2640 | if (s->pid <= 0) |
2641 | return; | |
2642 | ||
4c940960 LP |
2643 | prefix = strempty(prefix); |
2644 | ||
9fb86720 | 2645 | fprintf(f, |
ccd06097 ZJS |
2646 | "%sPID: "PID_FMT"\n", |
2647 | prefix, s->pid); | |
9fb86720 | 2648 | |
63983207 | 2649 | if (s->start_timestamp.realtime > 0) |
9fb86720 LP |
2650 | fprintf(f, |
2651 | "%sStart Timestamp: %s\n", | |
63983207 | 2652 | prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime)); |
9fb86720 | 2653 | |
63983207 | 2654 | if (s->exit_timestamp.realtime > 0) |
9fb86720 LP |
2655 | fprintf(f, |
2656 | "%sExit Timestamp: %s\n" | |
2657 | "%sExit Code: %s\n" | |
2658 | "%sExit Status: %i\n", | |
63983207 | 2659 | prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime), |
9fb86720 LP |
2660 | prefix, sigchld_code_to_string(s->code), |
2661 | prefix, s->status); | |
5cb5a6ff | 2662 | } |
44d8db9e | 2663 | |
9e2f7c11 | 2664 | char *exec_command_line(char **argv) { |
44d8db9e LP |
2665 | size_t k; |
2666 | char *n, *p, **a; | |
2667 | bool first = true; | |
2668 | ||
9e2f7c11 | 2669 | assert(argv); |
44d8db9e | 2670 | |
9164977d | 2671 | k = 1; |
9e2f7c11 | 2672 | STRV_FOREACH(a, argv) |
44d8db9e LP |
2673 | k += strlen(*a)+3; |
2674 | ||
2675 | if (!(n = new(char, k))) | |
2676 | return NULL; | |
2677 | ||
2678 | p = n; | |
9e2f7c11 | 2679 | STRV_FOREACH(a, argv) { |
44d8db9e LP |
2680 | |
2681 | if (!first) | |
2682 | *(p++) = ' '; | |
2683 | else | |
2684 | first = false; | |
2685 | ||
2686 | if (strpbrk(*a, WHITESPACE)) { | |
2687 | *(p++) = '\''; | |
2688 | p = stpcpy(p, *a); | |
2689 | *(p++) = '\''; | |
2690 | } else | |
2691 | p = stpcpy(p, *a); | |
2692 | ||
2693 | } | |
2694 | ||
9164977d LP |
2695 | *p = 0; |
2696 | ||
44d8db9e LP |
2697 | /* FIXME: this doesn't really handle arguments that have |
2698 | * spaces and ticks in them */ | |
2699 | ||
2700 | return n; | |
2701 | } | |
2702 | ||
2703 | void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) { | |
e1d75803 | 2704 | _cleanup_free_ char *cmd = NULL; |
4c940960 | 2705 | const char *prefix2; |
44d8db9e LP |
2706 | |
2707 | assert(c); | |
2708 | assert(f); | |
2709 | ||
4c940960 | 2710 | prefix = strempty(prefix); |
63c372cb | 2711 | prefix2 = strjoina(prefix, "\t"); |
44d8db9e | 2712 | |
9e2f7c11 | 2713 | cmd = exec_command_line(c->argv); |
44d8db9e LP |
2714 | fprintf(f, |
2715 | "%sCommand Line: %s\n", | |
2716 | prefix, cmd ? cmd : strerror(ENOMEM)); | |
2717 | ||
9fb86720 | 2718 | exec_status_dump(&c->exec_status, f, prefix2); |
44d8db9e LP |
2719 | } |
2720 | ||
2721 | void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) { | |
2722 | assert(f); | |
2723 | ||
4c940960 | 2724 | prefix = strempty(prefix); |
44d8db9e LP |
2725 | |
2726 | LIST_FOREACH(command, c, c) | |
2727 | exec_command_dump(c, f, prefix); | |
2728 | } | |
94f04347 | 2729 | |
a6a80b4f LP |
2730 | void exec_command_append_list(ExecCommand **l, ExecCommand *e) { |
2731 | ExecCommand *end; | |
2732 | ||
2733 | assert(l); | |
2734 | assert(e); | |
2735 | ||
2736 | if (*l) { | |
35b8ca3a | 2737 | /* It's kind of important, that we keep the order here */ |
71fda00f LP |
2738 | LIST_FIND_TAIL(command, *l, end); |
2739 | LIST_INSERT_AFTER(command, *l, end, e); | |
a6a80b4f LP |
2740 | } else |
2741 | *l = e; | |
2742 | } | |
2743 | ||
26fd040d LP |
2744 | int exec_command_set(ExecCommand *c, const char *path, ...) { |
2745 | va_list ap; | |
2746 | char **l, *p; | |
2747 | ||
2748 | assert(c); | |
2749 | assert(path); | |
2750 | ||
2751 | va_start(ap, path); | |
2752 | l = strv_new_ap(path, ap); | |
2753 | va_end(ap); | |
2754 | ||
2755 | if (!l) | |
2756 | return -ENOMEM; | |
2757 | ||
250a918d LP |
2758 | p = strdup(path); |
2759 | if (!p) { | |
26fd040d LP |
2760 | strv_free(l); |
2761 | return -ENOMEM; | |
2762 | } | |
2763 | ||
2764 | free(c->path); | |
2765 | c->path = p; | |
2766 | ||
2767 | strv_free(c->argv); | |
2768 | c->argv = l; | |
2769 | ||
2770 | return 0; | |
2771 | } | |
2772 | ||
86b23b07 | 2773 | int exec_command_append(ExecCommand *c, const char *path, ...) { |
e63ff941 | 2774 | _cleanup_strv_free_ char **l = NULL; |
86b23b07 | 2775 | va_list ap; |
86b23b07 JS |
2776 | int r; |
2777 | ||
2778 | assert(c); | |
2779 | assert(path); | |
2780 | ||
2781 | va_start(ap, path); | |
2782 | l = strv_new_ap(path, ap); | |
2783 | va_end(ap); | |
2784 | ||
2785 | if (!l) | |
2786 | return -ENOMEM; | |
2787 | ||
e287086b | 2788 | r = strv_extend_strv(&c->argv, l, false); |
e63ff941 | 2789 | if (r < 0) |
86b23b07 | 2790 | return r; |
86b23b07 JS |
2791 | |
2792 | return 0; | |
2793 | } | |
2794 | ||
2795 | ||
613b411c LP |
2796 | static int exec_runtime_allocate(ExecRuntime **rt) { |
2797 | ||
2798 | if (*rt) | |
2799 | return 0; | |
2800 | ||
2801 | *rt = new0(ExecRuntime, 1); | |
f146f5e1 | 2802 | if (!*rt) |
613b411c LP |
2803 | return -ENOMEM; |
2804 | ||
2805 | (*rt)->n_ref = 1; | |
2806 | (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1; | |
2807 | ||
2808 | return 0; | |
2809 | } | |
2810 | ||
2811 | int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) { | |
2812 | int r; | |
2813 | ||
2814 | assert(rt); | |
2815 | assert(c); | |
2816 | assert(id); | |
2817 | ||
2818 | if (*rt) | |
2819 | return 1; | |
2820 | ||
2821 | if (!c->private_network && !c->private_tmp) | |
2822 | return 0; | |
2823 | ||
2824 | r = exec_runtime_allocate(rt); | |
2825 | if (r < 0) | |
2826 | return r; | |
2827 | ||
2828 | if (c->private_network && (*rt)->netns_storage_socket[0] < 0) { | |
2829 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, (*rt)->netns_storage_socket) < 0) | |
2830 | return -errno; | |
2831 | } | |
2832 | ||
2833 | if (c->private_tmp && !(*rt)->tmp_dir) { | |
2834 | r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir); | |
2835 | if (r < 0) | |
2836 | return r; | |
2837 | } | |
2838 | ||
2839 | return 1; | |
2840 | } | |
2841 | ||
2842 | ExecRuntime *exec_runtime_ref(ExecRuntime *r) { | |
2843 | assert(r); | |
2844 | assert(r->n_ref > 0); | |
2845 | ||
2846 | r->n_ref++; | |
2847 | return r; | |
2848 | } | |
2849 | ||
2850 | ExecRuntime *exec_runtime_unref(ExecRuntime *r) { | |
2851 | ||
2852 | if (!r) | |
2853 | return NULL; | |
2854 | ||
2855 | assert(r->n_ref > 0); | |
2856 | ||
2857 | r->n_ref--; | |
f2341e0a LP |
2858 | if (r->n_ref > 0) |
2859 | return NULL; | |
2860 | ||
2861 | free(r->tmp_dir); | |
2862 | free(r->var_tmp_dir); | |
2863 | safe_close_pair(r->netns_storage_socket); | |
2864 | free(r); | |
613b411c LP |
2865 | |
2866 | return NULL; | |
2867 | } | |
2868 | ||
f2341e0a | 2869 | int exec_runtime_serialize(Unit *u, ExecRuntime *rt, FILE *f, FDSet *fds) { |
613b411c LP |
2870 | assert(u); |
2871 | assert(f); | |
2872 | assert(fds); | |
2873 | ||
2874 | if (!rt) | |
2875 | return 0; | |
2876 | ||
2877 | if (rt->tmp_dir) | |
2878 | unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir); | |
2879 | ||
2880 | if (rt->var_tmp_dir) | |
2881 | unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir); | |
2882 | ||
2883 | if (rt->netns_storage_socket[0] >= 0) { | |
2884 | int copy; | |
2885 | ||
2886 | copy = fdset_put_dup(fds, rt->netns_storage_socket[0]); | |
2887 | if (copy < 0) | |
2888 | return copy; | |
2889 | ||
2890 | unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy); | |
2891 | } | |
2892 | ||
2893 | if (rt->netns_storage_socket[1] >= 0) { | |
2894 | int copy; | |
2895 | ||
2896 | copy = fdset_put_dup(fds, rt->netns_storage_socket[1]); | |
2897 | if (copy < 0) | |
2898 | return copy; | |
2899 | ||
2900 | unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy); | |
2901 | } | |
2902 | ||
2903 | return 0; | |
2904 | } | |
2905 | ||
f2341e0a | 2906 | int exec_runtime_deserialize_item(Unit *u, ExecRuntime **rt, const char *key, const char *value, FDSet *fds) { |
613b411c LP |
2907 | int r; |
2908 | ||
2909 | assert(rt); | |
2910 | assert(key); | |
2911 | assert(value); | |
2912 | ||
2913 | if (streq(key, "tmp-dir")) { | |
2914 | char *copy; | |
2915 | ||
2916 | r = exec_runtime_allocate(rt); | |
2917 | if (r < 0) | |
f2341e0a | 2918 | return log_oom(); |
613b411c LP |
2919 | |
2920 | copy = strdup(value); | |
2921 | if (!copy) | |
2922 | return log_oom(); | |
2923 | ||
2924 | free((*rt)->tmp_dir); | |
2925 | (*rt)->tmp_dir = copy; | |
2926 | ||
2927 | } else if (streq(key, "var-tmp-dir")) { | |
2928 | char *copy; | |
2929 | ||
2930 | r = exec_runtime_allocate(rt); | |
2931 | if (r < 0) | |
f2341e0a | 2932 | return log_oom(); |
613b411c LP |
2933 | |
2934 | copy = strdup(value); | |
2935 | if (!copy) | |
2936 | return log_oom(); | |
2937 | ||
2938 | free((*rt)->var_tmp_dir); | |
2939 | (*rt)->var_tmp_dir = copy; | |
2940 | ||
2941 | } else if (streq(key, "netns-socket-0")) { | |
2942 | int fd; | |
2943 | ||
2944 | r = exec_runtime_allocate(rt); | |
2945 | if (r < 0) | |
f2341e0a | 2946 | return log_oom(); |
613b411c LP |
2947 | |
2948 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 2949 | log_unit_debug(u, "Failed to parse netns socket value: %s", value); |
613b411c | 2950 | else { |
03e334a1 | 2951 | safe_close((*rt)->netns_storage_socket[0]); |
613b411c LP |
2952 | (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd); |
2953 | } | |
2954 | } else if (streq(key, "netns-socket-1")) { | |
2955 | int fd; | |
2956 | ||
2957 | r = exec_runtime_allocate(rt); | |
2958 | if (r < 0) | |
f2341e0a | 2959 | return log_oom(); |
613b411c LP |
2960 | |
2961 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 2962 | log_unit_debug(u, "Failed to parse netns socket value: %s", value); |
613b411c | 2963 | else { |
03e334a1 | 2964 | safe_close((*rt)->netns_storage_socket[1]); |
613b411c LP |
2965 | (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd); |
2966 | } | |
2967 | } else | |
2968 | return 0; | |
2969 | ||
2970 | return 1; | |
2971 | } | |
2972 | ||
2973 | static void *remove_tmpdir_thread(void *p) { | |
2974 | _cleanup_free_ char *path = p; | |
2975 | ||
c6878637 | 2976 | (void) rm_rf(path, REMOVE_ROOT|REMOVE_PHYSICAL); |
613b411c LP |
2977 | return NULL; |
2978 | } | |
2979 | ||
2980 | void exec_runtime_destroy(ExecRuntime *rt) { | |
98b47d54 LP |
2981 | int r; |
2982 | ||
613b411c LP |
2983 | if (!rt) |
2984 | return; | |
2985 | ||
2986 | /* If there are multiple users of this, let's leave the stuff around */ | |
2987 | if (rt->n_ref > 1) | |
2988 | return; | |
2989 | ||
2990 | if (rt->tmp_dir) { | |
2991 | log_debug("Spawning thread to nuke %s", rt->tmp_dir); | |
98b47d54 LP |
2992 | |
2993 | r = asynchronous_job(remove_tmpdir_thread, rt->tmp_dir); | |
2994 | if (r < 0) { | |
da927ba9 | 2995 | log_warning_errno(r, "Failed to nuke %s: %m", rt->tmp_dir); |
98b47d54 LP |
2996 | free(rt->tmp_dir); |
2997 | } | |
2998 | ||
613b411c LP |
2999 | rt->tmp_dir = NULL; |
3000 | } | |
3001 | ||
3002 | if (rt->var_tmp_dir) { | |
3003 | log_debug("Spawning thread to nuke %s", rt->var_tmp_dir); | |
98b47d54 LP |
3004 | |
3005 | r = asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir); | |
3006 | if (r < 0) { | |
da927ba9 | 3007 | log_warning_errno(r, "Failed to nuke %s: %m", rt->var_tmp_dir); |
98b47d54 LP |
3008 | free(rt->var_tmp_dir); |
3009 | } | |
3010 | ||
613b411c LP |
3011 | rt->var_tmp_dir = NULL; |
3012 | } | |
3013 | ||
3d94f76c | 3014 | safe_close_pair(rt->netns_storage_socket); |
613b411c LP |
3015 | } |
3016 | ||
80876c20 LP |
3017 | static const char* const exec_input_table[_EXEC_INPUT_MAX] = { |
3018 | [EXEC_INPUT_NULL] = "null", | |
3019 | [EXEC_INPUT_TTY] = "tty", | |
3020 | [EXEC_INPUT_TTY_FORCE] = "tty-force", | |
4f2d528d LP |
3021 | [EXEC_INPUT_TTY_FAIL] = "tty-fail", |
3022 | [EXEC_INPUT_SOCKET] = "socket" | |
80876c20 LP |
3023 | }; |
3024 | ||
8a0867d6 LP |
3025 | DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput); |
3026 | ||
94f04347 | 3027 | static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = { |
80876c20 | 3028 | [EXEC_OUTPUT_INHERIT] = "inherit", |
94f04347 | 3029 | [EXEC_OUTPUT_NULL] = "null", |
80876c20 | 3030 | [EXEC_OUTPUT_TTY] = "tty", |
94f04347 | 3031 | [EXEC_OUTPUT_SYSLOG] = "syslog", |
28dbc1e8 | 3032 | [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console", |
9a6bca7a | 3033 | [EXEC_OUTPUT_KMSG] = "kmsg", |
28dbc1e8 | 3034 | [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console", |
706343f4 LP |
3035 | [EXEC_OUTPUT_JOURNAL] = "journal", |
3036 | [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console", | |
4f2d528d | 3037 | [EXEC_OUTPUT_SOCKET] = "socket" |
94f04347 LP |
3038 | }; |
3039 | ||
3040 | DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput); | |
023a4f67 LP |
3041 | |
3042 | static const char* const exec_utmp_mode_table[_EXEC_UTMP_MODE_MAX] = { | |
3043 | [EXEC_UTMP_INIT] = "init", | |
3044 | [EXEC_UTMP_LOGIN] = "login", | |
3045 | [EXEC_UTMP_USER] = "user", | |
3046 | }; | |
3047 | ||
3048 | DEFINE_STRING_TABLE_LOOKUP(exec_utmp_mode, ExecUtmpMode); |