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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
5cb5a6ff | 2 | |
a7334b09 LP |
3 | /*** |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
a7334b09 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
a7334b09 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
a7334b09 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
034c6ed7 LP |
22 | #include <errno.h> |
23 | #include <fcntl.h> | |
24 | #include <unistd.h> | |
44d8db9e | 25 | #include <string.h> |
309bff19 | 26 | #include <signal.h> |
071830ff LP |
27 | #include <sys/socket.h> |
28 | #include <sys/un.h> | |
94f04347 | 29 | #include <sys/prctl.h> |
451a074f | 30 | #include <sys/stat.h> |
81a2b7ce | 31 | #include <grp.h> |
0a6f50c0 | 32 | #include <poll.h> |
2bef10ab | 33 | #include <glob.h> |
023a4f67 | 34 | #include <utmpx.h> |
ac45f971 | 35 | #include <sys/personality.h> |
5cb5a6ff | 36 | |
5b6319dc LP |
37 | #ifdef HAVE_PAM |
38 | #include <security/pam_appl.h> | |
39 | #endif | |
40 | ||
7b52a628 MS |
41 | #ifdef HAVE_SELINUX |
42 | #include <selinux/selinux.h> | |
43 | #endif | |
44 | ||
17df7223 LP |
45 | #ifdef HAVE_SECCOMP |
46 | #include <seccomp.h> | |
47 | #endif | |
48 | ||
eef65bf3 MS |
49 | #ifdef HAVE_APPARMOR |
50 | #include <sys/apparmor.h> | |
51 | #endif | |
52 | ||
24882e06 | 53 | #include "sd-messages.h" |
c6878637 | 54 | #include "rm-rf.h" |
5cb5a6ff LP |
55 | #include "strv.h" |
56 | #include "macro.h" | |
d7832d2c | 57 | #include "capability.h" |
5cb5a6ff | 58 | #include "util.h" |
acbb0225 | 59 | #include "log.h" |
9eba9da4 | 60 | #include "ioprio.h" |
94f04347 | 61 | #include "securebits.h" |
15ae422b | 62 | #include "namespace.h" |
d06dacd0 | 63 | #include "exit-status.h" |
dd6c17b1 | 64 | #include "missing.h" |
169c1bda | 65 | #include "utmp-wtmp.h" |
f6a6225e | 66 | #include "def.h" |
9eb977db | 67 | #include "path-util.h" |
4d1a6904 | 68 | #include "env-util.h" |
a5c32cff | 69 | #include "fileio.h" |
4ad49000 | 70 | #include "unit.h" |
f485606b | 71 | #include "async.h" |
0d3f7bb3 | 72 | #include "selinux-util.h" |
17df7223 | 73 | #include "errno-list.h" |
4298d0b5 | 74 | #include "af-list.h" |
e66cf1a3 | 75 | #include "mkdir.h" |
2ca620c4 | 76 | #include "smack-util.h" |
3c70e3bb | 77 | #include "bus-endpoint.h" |
2822da4f | 78 | #include "cap-list.h" |
6482f626 | 79 | #include "formats-util.h" |
0b452006 | 80 | #include "process-util.h" |
288a74cc | 81 | #include "terminal-util.h" |
24882e06 | 82 | #include "signal-util.h" |
5cb5a6ff | 83 | |
2eec67ac TA |
84 | #ifdef HAVE_APPARMOR |
85 | #include "apparmor-util.h" | |
86 | #endif | |
87 | ||
57183d11 LP |
88 | #ifdef HAVE_SECCOMP |
89 | #include "seccomp-util.h" | |
90 | #endif | |
91 | ||
24882e06 LP |
92 | #include "execute.h" |
93 | ||
e056b01d | 94 | #define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC) |
31a7eb86 | 95 | #define IDLE_TIMEOUT2_USEC (1*USEC_PER_SEC) |
e6a26745 | 96 | |
02a51aba LP |
97 | /* This assumes there is a 'tty' group */ |
98 | #define TTY_MODE 0620 | |
99 | ||
531dca78 LP |
100 | #define SNDBUF_SIZE (8*1024*1024) |
101 | ||
034c6ed7 LP |
102 | static int shift_fds(int fds[], unsigned n_fds) { |
103 | int start, restart_from; | |
104 | ||
105 | if (n_fds <= 0) | |
106 | return 0; | |
107 | ||
a0d40ac5 LP |
108 | /* Modifies the fds array! (sorts it) */ |
109 | ||
034c6ed7 LP |
110 | assert(fds); |
111 | ||
112 | start = 0; | |
113 | for (;;) { | |
114 | int i; | |
115 | ||
116 | restart_from = -1; | |
117 | ||
118 | for (i = start; i < (int) n_fds; i++) { | |
119 | int nfd; | |
120 | ||
121 | /* Already at right index? */ | |
122 | if (fds[i] == i+3) | |
123 | continue; | |
124 | ||
3cc2aff1 LP |
125 | nfd = fcntl(fds[i], F_DUPFD, i + 3); |
126 | if (nfd < 0) | |
034c6ed7 LP |
127 | return -errno; |
128 | ||
03e334a1 | 129 | safe_close(fds[i]); |
034c6ed7 LP |
130 | fds[i] = nfd; |
131 | ||
132 | /* Hmm, the fd we wanted isn't free? Then | |
ee33e53a | 133 | * let's remember that and try again from here */ |
034c6ed7 LP |
134 | if (nfd != i+3 && restart_from < 0) |
135 | restart_from = i; | |
136 | } | |
137 | ||
138 | if (restart_from < 0) | |
139 | break; | |
140 | ||
141 | start = restart_from; | |
142 | } | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
c2748801 | 147 | static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) { |
47a71eed | 148 | unsigned i; |
e2c76839 | 149 | int r; |
47a71eed LP |
150 | |
151 | if (n_fds <= 0) | |
152 | return 0; | |
153 | ||
154 | assert(fds); | |
155 | ||
451a074f | 156 | /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */ |
47a71eed LP |
157 | |
158 | for (i = 0; i < n_fds; i++) { | |
47a71eed | 159 | |
3cc2aff1 LP |
160 | r = fd_nonblock(fds[i], nonblock); |
161 | if (r < 0) | |
e2c76839 | 162 | return r; |
47a71eed | 163 | |
451a074f LP |
164 | /* We unconditionally drop FD_CLOEXEC from the fds, |
165 | * since after all we want to pass these fds to our | |
166 | * children */ | |
47a71eed | 167 | |
3cc2aff1 LP |
168 | r = fd_cloexec(fds[i], false); |
169 | if (r < 0) | |
e2c76839 | 170 | return r; |
47a71eed LP |
171 | } |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
44a6b1b6 | 176 | _pure_ static const char *tty_path(const ExecContext *context) { |
80876c20 LP |
177 | assert(context); |
178 | ||
179 | if (context->tty_path) | |
180 | return context->tty_path; | |
181 | ||
182 | return "/dev/console"; | |
183 | } | |
184 | ||
9588bc32 | 185 | static void exec_context_tty_reset(const ExecContext *context) { |
6ea832a2 LP |
186 | assert(context); |
187 | ||
188 | if (context->tty_vhangup) | |
189 | terminal_vhangup(tty_path(context)); | |
190 | ||
191 | if (context->tty_reset) | |
192 | reset_terminal(tty_path(context)); | |
193 | ||
194 | if (context->tty_vt_disallocate && context->tty_path) | |
195 | vt_disallocate(context->tty_path); | |
196 | } | |
197 | ||
3a1286b6 MS |
198 | static bool is_terminal_output(ExecOutput o) { |
199 | return | |
200 | o == EXEC_OUTPUT_TTY || | |
201 | o == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
202 | o == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
203 | o == EXEC_OUTPUT_JOURNAL_AND_CONSOLE; | |
204 | } | |
205 | ||
80876c20 LP |
206 | static int open_null_as(int flags, int nfd) { |
207 | int fd, r; | |
071830ff | 208 | |
80876c20 | 209 | assert(nfd >= 0); |
071830ff | 210 | |
613b411c LP |
211 | fd = open("/dev/null", flags|O_NOCTTY); |
212 | if (fd < 0) | |
071830ff LP |
213 | return -errno; |
214 | ||
80876c20 LP |
215 | if (fd != nfd) { |
216 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 217 | safe_close(fd); |
80876c20 LP |
218 | } else |
219 | r = nfd; | |
071830ff | 220 | |
80876c20 | 221 | return r; |
071830ff LP |
222 | } |
223 | ||
524daa8c | 224 | static int connect_journal_socket(int fd, uid_t uid, gid_t gid) { |
b92bea5d ZJS |
225 | union sockaddr_union sa = { |
226 | .un.sun_family = AF_UNIX, | |
227 | .un.sun_path = "/run/systemd/journal/stdout", | |
228 | }; | |
524daa8c ZJS |
229 | uid_t olduid = UID_INVALID; |
230 | gid_t oldgid = GID_INVALID; | |
231 | int r; | |
232 | ||
233 | if (gid != GID_INVALID) { | |
234 | oldgid = getgid(); | |
235 | ||
236 | r = setegid(gid); | |
237 | if (r < 0) | |
238 | return -errno; | |
239 | } | |
240 | ||
241 | if (uid != UID_INVALID) { | |
242 | olduid = getuid(); | |
243 | ||
244 | r = seteuid(uid); | |
245 | if (r < 0) { | |
246 | r = -errno; | |
247 | goto restore_gid; | |
248 | } | |
249 | } | |
250 | ||
251 | r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)); | |
252 | if (r < 0) | |
253 | r = -errno; | |
254 | ||
255 | /* If we fail to restore the uid or gid, things will likely | |
256 | fail later on. This should only happen if an LSM interferes. */ | |
257 | ||
258 | if (uid != UID_INVALID) | |
259 | (void) seteuid(olduid); | |
260 | ||
261 | restore_gid: | |
262 | if (gid != GID_INVALID) | |
263 | (void) setegid(oldgid); | |
264 | ||
265 | return r; | |
266 | } | |
267 | ||
268 | 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) { | |
269 | int fd, r; | |
071830ff LP |
270 | |
271 | assert(context); | |
80876c20 LP |
272 | assert(output < _EXEC_OUTPUT_MAX); |
273 | assert(ident); | |
274 | assert(nfd >= 0); | |
071830ff | 275 | |
54fe0cdb LP |
276 | fd = socket(AF_UNIX, SOCK_STREAM, 0); |
277 | if (fd < 0) | |
80876c20 | 278 | return -errno; |
071830ff | 279 | |
524daa8c ZJS |
280 | r = connect_journal_socket(fd, uid, gid); |
281 | if (r < 0) | |
282 | return r; | |
071830ff | 283 | |
80876c20 | 284 | if (shutdown(fd, SHUT_RD) < 0) { |
03e334a1 | 285 | safe_close(fd); |
80876c20 LP |
286 | return -errno; |
287 | } | |
071830ff | 288 | |
531dca78 LP |
289 | fd_inc_sndbuf(fd, SNDBUF_SIZE); |
290 | ||
80876c20 | 291 | dprintf(fd, |
62bca2c6 | 292 | "%s\n" |
80876c20 LP |
293 | "%s\n" |
294 | "%i\n" | |
54fe0cdb LP |
295 | "%i\n" |
296 | "%i\n" | |
297 | "%i\n" | |
4f4a1dbf | 298 | "%i\n", |
4f4a1dbf | 299 | context->syslog_identifier ? context->syslog_identifier : ident, |
62bca2c6 | 300 | unit_id, |
54fe0cdb LP |
301 | context->syslog_priority, |
302 | !!context->syslog_level_prefix, | |
303 | output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE, | |
304 | output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE, | |
3a1286b6 | 305 | is_terminal_output(output)); |
80876c20 LP |
306 | |
307 | if (fd != nfd) { | |
308 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 309 | safe_close(fd); |
80876c20 LP |
310 | } else |
311 | r = nfd; | |
071830ff | 312 | |
80876c20 LP |
313 | return r; |
314 | } | |
315 | static int open_terminal_as(const char *path, mode_t mode, int nfd) { | |
316 | int fd, r; | |
071830ff | 317 | |
80876c20 LP |
318 | assert(path); |
319 | assert(nfd >= 0); | |
071830ff | 320 | |
3cc2aff1 LP |
321 | fd = open_terminal(path, mode | O_NOCTTY); |
322 | if (fd < 0) | |
80876c20 | 323 | return fd; |
071830ff | 324 | |
80876c20 LP |
325 | if (fd != nfd) { |
326 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 327 | safe_close(fd); |
80876c20 LP |
328 | } else |
329 | r = nfd; | |
071830ff | 330 | |
80876c20 LP |
331 | return r; |
332 | } | |
071830ff | 333 | |
80876c20 LP |
334 | static bool is_terminal_input(ExecInput i) { |
335 | return | |
336 | i == EXEC_INPUT_TTY || | |
337 | i == EXEC_INPUT_TTY_FORCE || | |
338 | i == EXEC_INPUT_TTY_FAIL; | |
339 | } | |
071830ff | 340 | |
1e3ad081 LP |
341 | static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) { |
342 | ||
343 | if (is_terminal_input(std_input) && !apply_tty_stdin) | |
344 | return EXEC_INPUT_NULL; | |
071830ff | 345 | |
03fd9c49 | 346 | if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0) |
4f2d528d LP |
347 | return EXEC_INPUT_NULL; |
348 | ||
03fd9c49 | 349 | return std_input; |
4f2d528d LP |
350 | } |
351 | ||
03fd9c49 | 352 | static int fixup_output(ExecOutput std_output, int socket_fd) { |
4f2d528d | 353 | |
03fd9c49 | 354 | if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0) |
4f2d528d LP |
355 | return EXEC_OUTPUT_INHERIT; |
356 | ||
03fd9c49 | 357 | return std_output; |
4f2d528d LP |
358 | } |
359 | ||
1e3ad081 | 360 | static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) { |
4f2d528d LP |
361 | ExecInput i; |
362 | ||
363 | assert(context); | |
364 | ||
1e3ad081 | 365 | i = fixup_input(context->std_input, socket_fd, apply_tty_stdin); |
4f2d528d LP |
366 | |
367 | switch (i) { | |
071830ff | 368 | |
80876c20 LP |
369 | case EXEC_INPUT_NULL: |
370 | return open_null_as(O_RDONLY, STDIN_FILENO); | |
371 | ||
372 | case EXEC_INPUT_TTY: | |
373 | case EXEC_INPUT_TTY_FORCE: | |
374 | case EXEC_INPUT_TTY_FAIL: { | |
375 | int fd, r; | |
071830ff | 376 | |
970edce6 ZJS |
377 | fd = acquire_terminal(tty_path(context), |
378 | i == EXEC_INPUT_TTY_FAIL, | |
379 | i == EXEC_INPUT_TTY_FORCE, | |
380 | false, | |
3a43da28 | 381 | USEC_INFINITY); |
970edce6 | 382 | if (fd < 0) |
80876c20 LP |
383 | return fd; |
384 | ||
385 | if (fd != STDIN_FILENO) { | |
386 | r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
03e334a1 | 387 | safe_close(fd); |
80876c20 LP |
388 | } else |
389 | r = STDIN_FILENO; | |
390 | ||
391 | return r; | |
392 | } | |
393 | ||
4f2d528d LP |
394 | case EXEC_INPUT_SOCKET: |
395 | return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
396 | ||
80876c20 LP |
397 | default: |
398 | assert_not_reached("Unknown input type"); | |
399 | } | |
400 | } | |
401 | ||
f2341e0a | 402 | static int setup_output(Unit *unit, const ExecContext *context, int fileno, int socket_fd, const char *ident, bool apply_tty_stdin, uid_t uid, gid_t gid) { |
4f2d528d LP |
403 | ExecOutput o; |
404 | ExecInput i; | |
47c1d80d | 405 | int r; |
4f2d528d | 406 | |
f2341e0a | 407 | assert(unit); |
80876c20 LP |
408 | assert(context); |
409 | assert(ident); | |
410 | ||
1e3ad081 | 411 | i = fixup_input(context->std_input, socket_fd, apply_tty_stdin); |
03fd9c49 | 412 | o = fixup_output(context->std_output, socket_fd); |
4f2d528d | 413 | |
eb17e935 MS |
414 | if (fileno == STDERR_FILENO) { |
415 | ExecOutput e; | |
416 | e = fixup_output(context->std_error, socket_fd); | |
80876c20 | 417 | |
eb17e935 MS |
418 | /* This expects the input and output are already set up */ |
419 | ||
420 | /* Don't change the stderr file descriptor if we inherit all | |
421 | * the way and are not on a tty */ | |
422 | if (e == EXEC_OUTPUT_INHERIT && | |
423 | o == EXEC_OUTPUT_INHERIT && | |
424 | i == EXEC_INPUT_NULL && | |
425 | !is_terminal_input(context->std_input) && | |
426 | getppid () != 1) | |
427 | return fileno; | |
428 | ||
429 | /* Duplicate from stdout if possible */ | |
430 | if (e == o || e == EXEC_OUTPUT_INHERIT) | |
431 | return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno; | |
071830ff | 432 | |
eb17e935 | 433 | o = e; |
80876c20 | 434 | |
eb17e935 | 435 | } else if (o == EXEC_OUTPUT_INHERIT) { |
21d21ea4 LP |
436 | /* If input got downgraded, inherit the original value */ |
437 | if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input)) | |
eb17e935 | 438 | return open_terminal_as(tty_path(context), O_WRONLY, fileno); |
21d21ea4 | 439 | |
acb591e4 | 440 | /* If the input is connected to anything that's not a /dev/null, inherit that... */ |
ff876e28 | 441 | if (i != EXEC_INPUT_NULL) |
eb17e935 | 442 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; |
071830ff | 443 | |
acb591e4 LP |
444 | /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */ |
445 | if (getppid() != 1) | |
eb17e935 | 446 | return fileno; |
94f04347 | 447 | |
eb17e935 MS |
448 | /* We need to open /dev/null here anew, to get the right access mode. */ |
449 | return open_null_as(O_WRONLY, fileno); | |
071830ff | 450 | } |
94f04347 | 451 | |
eb17e935 | 452 | switch (o) { |
80876c20 LP |
453 | |
454 | case EXEC_OUTPUT_NULL: | |
eb17e935 | 455 | return open_null_as(O_WRONLY, fileno); |
80876c20 LP |
456 | |
457 | case EXEC_OUTPUT_TTY: | |
4f2d528d | 458 | if (is_terminal_input(i)) |
eb17e935 | 459 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; |
80876c20 LP |
460 | |
461 | /* We don't reset the terminal if this is just about output */ | |
eb17e935 | 462 | return open_terminal_as(tty_path(context), O_WRONLY, fileno); |
80876c20 LP |
463 | |
464 | case EXEC_OUTPUT_SYSLOG: | |
28dbc1e8 | 465 | case EXEC_OUTPUT_SYSLOG_AND_CONSOLE: |
9a6bca7a | 466 | case EXEC_OUTPUT_KMSG: |
28dbc1e8 | 467 | case EXEC_OUTPUT_KMSG_AND_CONSOLE: |
706343f4 LP |
468 | case EXEC_OUTPUT_JOURNAL: |
469 | case EXEC_OUTPUT_JOURNAL_AND_CONSOLE: | |
f2341e0a | 470 | r = connect_logger_as(context, o, ident, unit->id, fileno, uid, gid); |
47c1d80d | 471 | if (r < 0) { |
f2341e0a | 472 | log_unit_error_errno(unit, r, "Failed to connect %s to the journal socket, ignoring: %m", fileno == STDOUT_FILENO ? "stdout" : "stderr"); |
eb17e935 | 473 | r = open_null_as(O_WRONLY, fileno); |
47c1d80d MS |
474 | } |
475 | return r; | |
4f2d528d LP |
476 | |
477 | case EXEC_OUTPUT_SOCKET: | |
478 | assert(socket_fd >= 0); | |
eb17e935 | 479 | return dup2(socket_fd, fileno) < 0 ? -errno : fileno; |
94f04347 LP |
480 | |
481 | default: | |
80876c20 | 482 | assert_not_reached("Unknown error type"); |
94f04347 | 483 | } |
071830ff LP |
484 | } |
485 | ||
02a51aba LP |
486 | static int chown_terminal(int fd, uid_t uid) { |
487 | struct stat st; | |
488 | ||
489 | assert(fd >= 0); | |
02a51aba LP |
490 | |
491 | /* This might fail. What matters are the results. */ | |
bab45044 LP |
492 | (void) fchown(fd, uid, -1); |
493 | (void) fchmod(fd, TTY_MODE); | |
02a51aba LP |
494 | |
495 | if (fstat(fd, &st) < 0) | |
496 | return -errno; | |
497 | ||
d8b4e2e9 | 498 | if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE) |
02a51aba LP |
499 | return -EPERM; |
500 | ||
501 | return 0; | |
502 | } | |
503 | ||
af6da548 | 504 | static int setup_confirm_stdio(int *_saved_stdin, |
80876c20 LP |
505 | int *_saved_stdout) { |
506 | int fd = -1, saved_stdin, saved_stdout = -1, r; | |
507 | ||
80876c20 LP |
508 | assert(_saved_stdin); |
509 | assert(_saved_stdout); | |
510 | ||
af6da548 LP |
511 | saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3); |
512 | if (saved_stdin < 0) | |
513 | return -errno; | |
80876c20 | 514 | |
af6da548 LP |
515 | saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3); |
516 | if (saved_stdout < 0) { | |
517 | r = errno; | |
80876c20 LP |
518 | goto fail; |
519 | } | |
520 | ||
af6da548 LP |
521 | fd = acquire_terminal( |
522 | "/dev/console", | |
523 | false, | |
524 | false, | |
525 | false, | |
526 | DEFAULT_CONFIRM_USEC); | |
527 | if (fd < 0) { | |
528 | r = fd; | |
80876c20 LP |
529 | goto fail; |
530 | } | |
531 | ||
af6da548 LP |
532 | r = chown_terminal(fd, getuid()); |
533 | if (r < 0) | |
02a51aba | 534 | goto fail; |
02a51aba | 535 | |
80876c20 | 536 | if (dup2(fd, STDIN_FILENO) < 0) { |
af6da548 | 537 | r = -errno; |
80876c20 LP |
538 | goto fail; |
539 | } | |
540 | ||
541 | if (dup2(fd, STDOUT_FILENO) < 0) { | |
af6da548 | 542 | r = -errno; |
80876c20 LP |
543 | goto fail; |
544 | } | |
545 | ||
546 | if (fd >= 2) | |
03e334a1 | 547 | safe_close(fd); |
80876c20 LP |
548 | |
549 | *_saved_stdin = saved_stdin; | |
550 | *_saved_stdout = saved_stdout; | |
551 | ||
552 | return 0; | |
553 | ||
554 | fail: | |
03e334a1 LP |
555 | safe_close(saved_stdout); |
556 | safe_close(saved_stdin); | |
557 | safe_close(fd); | |
80876c20 LP |
558 | |
559 | return r; | |
560 | } | |
561 | ||
44b601bc | 562 | _printf_(1, 2) static int write_confirm_message(const char *format, ...) { |
03e334a1 | 563 | _cleanup_close_ int fd = -1; |
af6da548 | 564 | va_list ap; |
80876c20 | 565 | |
af6da548 | 566 | assert(format); |
80876c20 | 567 | |
af6da548 LP |
568 | fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); |
569 | if (fd < 0) | |
570 | return fd; | |
80876c20 | 571 | |
af6da548 LP |
572 | va_start(ap, format); |
573 | vdprintf(fd, format, ap); | |
574 | va_end(ap); | |
80876c20 | 575 | |
af6da548 LP |
576 | return 0; |
577 | } | |
80876c20 | 578 | |
af6da548 LP |
579 | static int restore_confirm_stdio(int *saved_stdin, |
580 | int *saved_stdout) { | |
80876c20 | 581 | |
af6da548 | 582 | int r = 0; |
80876c20 | 583 | |
af6da548 LP |
584 | assert(saved_stdin); |
585 | assert(saved_stdout); | |
586 | ||
587 | release_terminal(); | |
588 | ||
589 | if (*saved_stdin >= 0) | |
80876c20 | 590 | if (dup2(*saved_stdin, STDIN_FILENO) < 0) |
af6da548 | 591 | r = -errno; |
80876c20 | 592 | |
af6da548 | 593 | if (*saved_stdout >= 0) |
80876c20 | 594 | if (dup2(*saved_stdout, STDOUT_FILENO) < 0) |
af6da548 | 595 | r = -errno; |
80876c20 | 596 | |
03e334a1 LP |
597 | safe_close(*saved_stdin); |
598 | safe_close(*saved_stdout); | |
af6da548 LP |
599 | |
600 | return r; | |
601 | } | |
602 | ||
603 | static int ask_for_confirmation(char *response, char **argv) { | |
604 | int saved_stdout = -1, saved_stdin = -1, r; | |
e1d75803 | 605 | _cleanup_free_ char *line = NULL; |
af6da548 LP |
606 | |
607 | r = setup_confirm_stdio(&saved_stdin, &saved_stdout); | |
608 | if (r < 0) | |
609 | return r; | |
610 | ||
611 | line = exec_command_line(argv); | |
612 | if (!line) | |
613 | return -ENOMEM; | |
614 | ||
418b9be5 | 615 | r = ask_char(response, "yns", "Execute %s? [Yes, No, Skip] ", line); |
af6da548 LP |
616 | |
617 | restore_confirm_stdio(&saved_stdin, &saved_stdout); | |
618 | ||
619 | return r; | |
80876c20 LP |
620 | } |
621 | ||
81a2b7ce LP |
622 | static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) { |
623 | bool keep_groups = false; | |
624 | int r; | |
625 | ||
626 | assert(context); | |
627 | ||
35b8ca3a | 628 | /* Lookup and set GID and supplementary group list. Here too |
81a2b7ce LP |
629 | * we avoid NSS lookups for gid=0. */ |
630 | ||
631 | if (context->group || username) { | |
632 | ||
4b67834e LP |
633 | if (context->group) { |
634 | const char *g = context->group; | |
635 | ||
3cc2aff1 LP |
636 | r = get_group_creds(&g, &gid); |
637 | if (r < 0) | |
81a2b7ce | 638 | return r; |
4b67834e | 639 | } |
81a2b7ce LP |
640 | |
641 | /* First step, initialize groups from /etc/groups */ | |
642 | if (username && gid != 0) { | |
643 | if (initgroups(username, gid) < 0) | |
644 | return -errno; | |
645 | ||
646 | keep_groups = true; | |
647 | } | |
648 | ||
649 | /* Second step, set our gids */ | |
650 | if (setresgid(gid, gid, gid) < 0) | |
651 | return -errno; | |
652 | } | |
653 | ||
654 | if (context->supplementary_groups) { | |
655 | int ngroups_max, k; | |
656 | gid_t *gids; | |
657 | char **i; | |
658 | ||
659 | /* Final step, initialize any manually set supplementary groups */ | |
da19d5c1 | 660 | assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0); |
81a2b7ce LP |
661 | |
662 | if (!(gids = new(gid_t, ngroups_max))) | |
663 | return -ENOMEM; | |
664 | ||
665 | if (keep_groups) { | |
3cc2aff1 LP |
666 | k = getgroups(ngroups_max, gids); |
667 | if (k < 0) { | |
81a2b7ce LP |
668 | free(gids); |
669 | return -errno; | |
670 | } | |
671 | } else | |
672 | k = 0; | |
673 | ||
674 | STRV_FOREACH(i, context->supplementary_groups) { | |
4b67834e | 675 | const char *g; |
81a2b7ce LP |
676 | |
677 | if (k >= ngroups_max) { | |
678 | free(gids); | |
679 | return -E2BIG; | |
680 | } | |
681 | ||
4b67834e LP |
682 | g = *i; |
683 | r = get_group_creds(&g, gids+k); | |
684 | if (r < 0) { | |
81a2b7ce LP |
685 | free(gids); |
686 | return r; | |
687 | } | |
688 | ||
689 | k++; | |
690 | } | |
691 | ||
692 | if (setgroups(k, gids) < 0) { | |
693 | free(gids); | |
694 | return -errno; | |
695 | } | |
696 | ||
697 | free(gids); | |
698 | } | |
699 | ||
700 | return 0; | |
701 | } | |
702 | ||
703 | static int enforce_user(const ExecContext *context, uid_t uid) { | |
81a2b7ce LP |
704 | assert(context); |
705 | ||
706 | /* Sets (but doesn't lookup) the uid and make sure we keep the | |
707 | * capabilities while doing so. */ | |
708 | ||
709 | if (context->capabilities) { | |
5ce70e5b | 710 | _cleanup_cap_free_ cap_t d = NULL; |
81a2b7ce LP |
711 | static const cap_value_t bits[] = { |
712 | CAP_SETUID, /* Necessary so that we can run setresuid() below */ | |
713 | CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */ | |
714 | }; | |
715 | ||
716 | /* First step: If we need to keep capabilities but | |
717 | * drop privileges we need to make sure we keep our | |
cbb21cca | 718 | * caps, while we drop privileges. */ |
693ced48 | 719 | if (uid != 0) { |
cbb21cca | 720 | int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS; |
693ced48 LP |
721 | |
722 | if (prctl(PR_GET_SECUREBITS) != sb) | |
723 | if (prctl(PR_SET_SECUREBITS, sb) < 0) | |
724 | return -errno; | |
725 | } | |
81a2b7ce | 726 | |
35b8ca3a | 727 | /* Second step: set the capabilities. This will reduce |
81a2b7ce LP |
728 | * the capabilities to the minimum we need. */ |
729 | ||
5ce70e5b ZJS |
730 | d = cap_dup(context->capabilities); |
731 | if (!d) | |
81a2b7ce LP |
732 | return -errno; |
733 | ||
734 | if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 || | |
5ce70e5b ZJS |
735 | cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) |
736 | return -errno; | |
81a2b7ce | 737 | |
5ce70e5b ZJS |
738 | if (cap_set_proc(d) < 0) |
739 | return -errno; | |
81a2b7ce LP |
740 | } |
741 | ||
742 | /* Third step: actually set the uids */ | |
743 | if (setresuid(uid, uid, uid) < 0) | |
744 | return -errno; | |
745 | ||
746 | /* At this point we should have all necessary capabilities but | |
747 | are otherwise a normal user. However, the caps might got | |
748 | corrupted due to the setresuid() so we need clean them up | |
749 | later. This is done outside of this call. */ | |
750 | ||
751 | return 0; | |
752 | } | |
753 | ||
5b6319dc LP |
754 | #ifdef HAVE_PAM |
755 | ||
756 | static int null_conv( | |
757 | int num_msg, | |
758 | const struct pam_message **msg, | |
759 | struct pam_response **resp, | |
760 | void *appdata_ptr) { | |
761 | ||
762 | /* We don't support conversations */ | |
763 | ||
764 | return PAM_CONV_ERR; | |
765 | } | |
766 | ||
767 | static int setup_pam( | |
768 | const char *name, | |
769 | const char *user, | |
940c5210 | 770 | uid_t uid, |
5b6319dc LP |
771 | const char *tty, |
772 | char ***pam_env, | |
773 | int fds[], unsigned n_fds) { | |
774 | ||
775 | static const struct pam_conv conv = { | |
776 | .conv = null_conv, | |
777 | .appdata_ptr = NULL | |
778 | }; | |
779 | ||
780 | pam_handle_t *handle = NULL; | |
d6e5f3ad | 781 | sigset_t old_ss; |
5b6319dc | 782 | int pam_code = PAM_SUCCESS; |
9ba35398 | 783 | int err; |
5b6319dc LP |
784 | char **e = NULL; |
785 | bool close_session = false; | |
786 | pid_t pam_pid = 0, parent_pid; | |
970edce6 | 787 | int flags = 0; |
5b6319dc LP |
788 | |
789 | assert(name); | |
790 | assert(user); | |
791 | assert(pam_env); | |
792 | ||
793 | /* We set up PAM in the parent process, then fork. The child | |
35b8ca3a | 794 | * will then stay around until killed via PR_GET_PDEATHSIG or |
5b6319dc LP |
795 | * systemd via the cgroup logic. It will then remove the PAM |
796 | * session again. The parent process will exec() the actual | |
797 | * daemon. We do things this way to ensure that the main PID | |
798 | * of the daemon is the one we initially fork()ed. */ | |
799 | ||
553d2243 | 800 | if (log_get_max_level() < LOG_DEBUG) |
970edce6 ZJS |
801 | flags |= PAM_SILENT; |
802 | ||
f546241b ZJS |
803 | pam_code = pam_start(name, user, &conv, &handle); |
804 | if (pam_code != PAM_SUCCESS) { | |
5b6319dc LP |
805 | handle = NULL; |
806 | goto fail; | |
807 | } | |
808 | ||
f546241b ZJS |
809 | if (tty) { |
810 | pam_code = pam_set_item(handle, PAM_TTY, tty); | |
811 | if (pam_code != PAM_SUCCESS) | |
5b6319dc | 812 | goto fail; |
f546241b | 813 | } |
5b6319dc | 814 | |
970edce6 | 815 | pam_code = pam_acct_mgmt(handle, flags); |
f546241b | 816 | if (pam_code != PAM_SUCCESS) |
5b6319dc LP |
817 | goto fail; |
818 | ||
970edce6 | 819 | pam_code = pam_open_session(handle, flags); |
f546241b | 820 | if (pam_code != PAM_SUCCESS) |
5b6319dc LP |
821 | goto fail; |
822 | ||
823 | close_session = true; | |
824 | ||
f546241b ZJS |
825 | e = pam_getenvlist(handle); |
826 | if (!e) { | |
5b6319dc LP |
827 | pam_code = PAM_BUF_ERR; |
828 | goto fail; | |
829 | } | |
830 | ||
831 | /* Block SIGTERM, so that we know that it won't get lost in | |
832 | * the child */ | |
ce30c8dc | 833 | |
72c0a2c2 | 834 | assert_se(sigprocmask_many(SIG_BLOCK, &old_ss, SIGTERM, -1) >= 0); |
5b6319dc LP |
835 | |
836 | parent_pid = getpid(); | |
837 | ||
f546241b ZJS |
838 | pam_pid = fork(); |
839 | if (pam_pid < 0) | |
5b6319dc LP |
840 | goto fail; |
841 | ||
842 | if (pam_pid == 0) { | |
843 | int sig; | |
844 | int r = EXIT_PAM; | |
845 | ||
846 | /* The child's job is to reset the PAM session on | |
847 | * termination */ | |
848 | ||
849 | /* This string must fit in 10 chars (i.e. the length | |
5d6b1584 LP |
850 | * of "/sbin/init"), to look pretty in /bin/ps */ |
851 | rename_process("(sd-pam)"); | |
5b6319dc LP |
852 | |
853 | /* Make sure we don't keep open the passed fds in this | |
854 | child. We assume that otherwise only those fds are | |
855 | open here that have been opened by PAM. */ | |
856 | close_many(fds, n_fds); | |
857 | ||
940c5210 AK |
858 | /* Drop privileges - we don't need any to pam_close_session |
859 | * and this will make PR_SET_PDEATHSIG work in most cases. | |
860 | * If this fails, ignore the error - but expect sd-pam threads | |
861 | * to fail to exit normally */ | |
862 | if (setresuid(uid, uid, uid) < 0) | |
da927ba9 | 863 | log_error_errno(r, "Error: Failed to setresuid() in sd-pam: %m"); |
940c5210 | 864 | |
ce30c8dc LP |
865 | (void) ignore_signals(SIGPIPE, -1); |
866 | ||
940c5210 AK |
867 | /* Wait until our parent died. This will only work if |
868 | * the above setresuid() succeeds, otherwise the kernel | |
869 | * will not allow unprivileged parents kill their privileged | |
870 | * children this way. We rely on the control groups kill logic | |
5b6319dc LP |
871 | * to do the rest for us. */ |
872 | if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) | |
873 | goto child_finish; | |
874 | ||
875 | /* Check if our parent process might already have | |
876 | * died? */ | |
877 | if (getppid() == parent_pid) { | |
d6e5f3ad DM |
878 | sigset_t ss; |
879 | ||
880 | assert_se(sigemptyset(&ss) >= 0); | |
881 | assert_se(sigaddset(&ss, SIGTERM) >= 0); | |
882 | ||
3dead8d9 LP |
883 | for (;;) { |
884 | if (sigwait(&ss, &sig) < 0) { | |
885 | if (errno == EINTR) | |
886 | continue; | |
887 | ||
888 | goto child_finish; | |
889 | } | |
5b6319dc | 890 | |
3dead8d9 LP |
891 | assert(sig == SIGTERM); |
892 | break; | |
893 | } | |
5b6319dc LP |
894 | } |
895 | ||
3dead8d9 | 896 | /* If our parent died we'll end the session */ |
f546241b | 897 | if (getppid() != parent_pid) { |
970edce6 | 898 | pam_code = pam_close_session(handle, flags); |
f546241b | 899 | if (pam_code != PAM_SUCCESS) |
5b6319dc | 900 | goto child_finish; |
f546241b | 901 | } |
5b6319dc LP |
902 | |
903 | r = 0; | |
904 | ||
905 | child_finish: | |
970edce6 | 906 | pam_end(handle, pam_code | flags); |
5b6319dc LP |
907 | _exit(r); |
908 | } | |
909 | ||
910 | /* If the child was forked off successfully it will do all the | |
911 | * cleanups, so forget about the handle here. */ | |
912 | handle = NULL; | |
913 | ||
3b8bddde | 914 | /* Unblock SIGTERM again in the parent */ |
72c0a2c2 | 915 | assert_se(sigprocmask(SIG_SETMASK, &old_ss, NULL) >= 0); |
5b6319dc LP |
916 | |
917 | /* We close the log explicitly here, since the PAM modules | |
918 | * might have opened it, but we don't want this fd around. */ | |
919 | closelog(); | |
920 | ||
aa87e624 LP |
921 | *pam_env = e; |
922 | e = NULL; | |
923 | ||
5b6319dc LP |
924 | return 0; |
925 | ||
926 | fail: | |
970edce6 ZJS |
927 | if (pam_code != PAM_SUCCESS) { |
928 | log_error("PAM failed: %s", pam_strerror(handle, pam_code)); | |
9ba35398 | 929 | err = -EPERM; /* PAM errors do not map to errno */ |
970edce6 | 930 | } else { |
56f64d95 | 931 | log_error_errno(errno, "PAM failed: %m"); |
9ba35398 | 932 | err = -errno; |
970edce6 | 933 | } |
9ba35398 | 934 | |
5b6319dc LP |
935 | if (handle) { |
936 | if (close_session) | |
970edce6 | 937 | pam_code = pam_close_session(handle, flags); |
5b6319dc | 938 | |
970edce6 | 939 | pam_end(handle, pam_code | flags); |
5b6319dc LP |
940 | } |
941 | ||
942 | strv_free(e); | |
943 | ||
944 | closelog(); | |
945 | ||
430c18ed | 946 | if (pam_pid > 1) { |
5b6319dc | 947 | kill(pam_pid, SIGTERM); |
430c18ed LP |
948 | kill(pam_pid, SIGCONT); |
949 | } | |
5b6319dc | 950 | |
9ba35398 | 951 | return err; |
5b6319dc LP |
952 | } |
953 | #endif | |
954 | ||
5d6b1584 LP |
955 | static void rename_process_from_path(const char *path) { |
956 | char process_name[11]; | |
957 | const char *p; | |
958 | size_t l; | |
959 | ||
960 | /* This resulting string must fit in 10 chars (i.e. the length | |
961 | * of "/sbin/init") to look pretty in /bin/ps */ | |
962 | ||
2b6bf07d | 963 | p = basename(path); |
5d6b1584 LP |
964 | if (isempty(p)) { |
965 | rename_process("(...)"); | |
966 | return; | |
967 | } | |
968 | ||
969 | l = strlen(p); | |
970 | if (l > 8) { | |
971 | /* The end of the process name is usually more | |
972 | * interesting, since the first bit might just be | |
973 | * "systemd-" */ | |
974 | p = p + l - 8; | |
975 | l = 8; | |
976 | } | |
977 | ||
978 | process_name[0] = '('; | |
979 | memcpy(process_name+1, p, l); | |
980 | process_name[1+l] = ')'; | |
981 | process_name[1+l+1] = 0; | |
982 | ||
983 | rename_process(process_name); | |
984 | } | |
985 | ||
c0467cf3 | 986 | #ifdef HAVE_SECCOMP |
17df7223 | 987 | |
822a5960 | 988 | static int apply_seccomp(const ExecContext *c) { |
17df7223 LP |
989 | uint32_t negative_action, action; |
990 | scmp_filter_ctx *seccomp; | |
c0467cf3 RC |
991 | Iterator i; |
992 | void *id; | |
17df7223 | 993 | int r; |
8351ceae | 994 | |
c0467cf3 | 995 | assert(c); |
8351ceae | 996 | |
17df7223 LP |
997 | negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno); |
998 | ||
999 | seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW); | |
1000 | if (!seccomp) | |
1001 | return -ENOMEM; | |
8351ceae | 1002 | |
e9642be2 LP |
1003 | if (c->syscall_archs) { |
1004 | ||
1005 | SET_FOREACH(id, c->syscall_archs, i) { | |
1006 | r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1); | |
1007 | if (r == -EEXIST) | |
1008 | continue; | |
7c66bae2 LP |
1009 | if (r < 0) |
1010 | goto finish; | |
e9642be2 | 1011 | } |
e9642be2 | 1012 | |
7c66bae2 | 1013 | } else { |
e9642be2 | 1014 | r = seccomp_add_secondary_archs(seccomp); |
7c66bae2 LP |
1015 | if (r < 0) |
1016 | goto finish; | |
57183d11 | 1017 | } |
8351ceae | 1018 | |
57183d11 | 1019 | action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action; |
17df7223 LP |
1020 | SET_FOREACH(id, c->syscall_filter, i) { |
1021 | r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0); | |
7c66bae2 LP |
1022 | if (r < 0) |
1023 | goto finish; | |
c0467cf3 | 1024 | } |
8351ceae | 1025 | |
7c66bae2 LP |
1026 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); |
1027 | if (r < 0) | |
1028 | goto finish; | |
1029 | ||
17df7223 | 1030 | r = seccomp_load(seccomp); |
7c66bae2 LP |
1031 | |
1032 | finish: | |
17df7223 | 1033 | seccomp_release(seccomp); |
4298d0b5 LP |
1034 | return r; |
1035 | } | |
1036 | ||
822a5960 | 1037 | static int apply_address_families(const ExecContext *c) { |
4298d0b5 LP |
1038 | scmp_filter_ctx *seccomp; |
1039 | Iterator i; | |
1040 | int r; | |
1041 | ||
1042 | assert(c); | |
1043 | ||
1044 | seccomp = seccomp_init(SCMP_ACT_ALLOW); | |
1045 | if (!seccomp) | |
1046 | return -ENOMEM; | |
1047 | ||
1048 | r = seccomp_add_secondary_archs(seccomp); | |
1049 | if (r < 0) | |
1050 | goto finish; | |
1051 | ||
1052 | if (c->address_families_whitelist) { | |
1053 | int af, first = 0, last = 0; | |
1054 | void *afp; | |
1055 | ||
1056 | /* If this is a whitelist, we first block the address | |
1057 | * families that are out of range and then everything | |
1058 | * that is not in the set. First, we find the lowest | |
1059 | * and highest address family in the set. */ | |
1060 | ||
1061 | SET_FOREACH(afp, c->address_families, i) { | |
1062 | af = PTR_TO_INT(afp); | |
17df7223 | 1063 | |
4298d0b5 LP |
1064 | if (af <= 0 || af >= af_max()) |
1065 | continue; | |
1066 | ||
1067 | if (first == 0 || af < first) | |
1068 | first = af; | |
1069 | ||
1070 | if (last == 0 || af > last) | |
1071 | last = af; | |
1072 | } | |
1073 | ||
1074 | assert((first == 0) == (last == 0)); | |
1075 | ||
1076 | if (first == 0) { | |
1077 | ||
1078 | /* No entries in the valid range, block everything */ | |
1079 | r = seccomp_rule_add( | |
1080 | seccomp, | |
1081 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1082 | SCMP_SYS(socket), | |
1083 | 0); | |
1084 | if (r < 0) | |
1085 | goto finish; | |
1086 | ||
1087 | } else { | |
1088 | ||
1089 | /* Block everything below the first entry */ | |
1090 | r = seccomp_rule_add( | |
1091 | seccomp, | |
1092 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1093 | SCMP_SYS(socket), | |
1094 | 1, | |
1095 | SCMP_A0(SCMP_CMP_LT, first)); | |
1096 | if (r < 0) | |
1097 | goto finish; | |
1098 | ||
1099 | /* Block everything above the last entry */ | |
1100 | r = seccomp_rule_add( | |
1101 | seccomp, | |
1102 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1103 | SCMP_SYS(socket), | |
1104 | 1, | |
1105 | SCMP_A0(SCMP_CMP_GT, last)); | |
1106 | if (r < 0) | |
1107 | goto finish; | |
1108 | ||
1109 | /* Block everything between the first and last | |
1110 | * entry */ | |
1111 | for (af = 1; af < af_max(); af++) { | |
1112 | ||
1113 | if (set_contains(c->address_families, INT_TO_PTR(af))) | |
1114 | continue; | |
1115 | ||
1116 | r = seccomp_rule_add( | |
1117 | seccomp, | |
1118 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1119 | SCMP_SYS(socket), | |
1120 | 1, | |
1121 | SCMP_A0(SCMP_CMP_EQ, af)); | |
1122 | if (r < 0) | |
1123 | goto finish; | |
1124 | } | |
1125 | } | |
1126 | ||
1127 | } else { | |
1128 | void *af; | |
1129 | ||
1130 | /* If this is a blacklist, then generate one rule for | |
1131 | * each address family that are then combined in OR | |
1132 | * checks. */ | |
1133 | ||
1134 | SET_FOREACH(af, c->address_families, i) { | |
1135 | ||
1136 | r = seccomp_rule_add( | |
1137 | seccomp, | |
1138 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1139 | SCMP_SYS(socket), | |
1140 | 1, | |
1141 | SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af))); | |
1142 | if (r < 0) | |
1143 | goto finish; | |
1144 | } | |
1145 | } | |
1146 | ||
1147 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1148 | if (r < 0) | |
1149 | goto finish; | |
1150 | ||
1151 | r = seccomp_load(seccomp); | |
1152 | ||
1153 | finish: | |
1154 | seccomp_release(seccomp); | |
17df7223 | 1155 | return r; |
8351ceae | 1156 | } |
4298d0b5 | 1157 | |
c0467cf3 | 1158 | #endif |
8351ceae | 1159 | |
31a7eb86 ZJS |
1160 | static void do_idle_pipe_dance(int idle_pipe[4]) { |
1161 | assert(idle_pipe); | |
1162 | ||
03e334a1 LP |
1163 | |
1164 | safe_close(idle_pipe[1]); | |
1165 | safe_close(idle_pipe[2]); | |
31a7eb86 ZJS |
1166 | |
1167 | if (idle_pipe[0] >= 0) { | |
1168 | int r; | |
1169 | ||
1170 | r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC); | |
1171 | ||
1172 | if (idle_pipe[3] >= 0 && r == 0 /* timeout */) { | |
1173 | /* Signal systemd that we are bored and want to continue. */ | |
cd972d69 ZJS |
1174 | r = write(idle_pipe[3], "x", 1); |
1175 | if (r > 0) | |
1176 | /* Wait for systemd to react to the signal above. */ | |
1177 | fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC); | |
31a7eb86 ZJS |
1178 | } |
1179 | ||
03e334a1 | 1180 | safe_close(idle_pipe[0]); |
31a7eb86 ZJS |
1181 | |
1182 | } | |
1183 | ||
03e334a1 | 1184 | safe_close(idle_pipe[3]); |
31a7eb86 ZJS |
1185 | } |
1186 | ||
7cae38c4 | 1187 | static int build_environment( |
9fa95f85 | 1188 | const ExecContext *c, |
7cae38c4 | 1189 | unsigned n_fds, |
09812eb7 | 1190 | usec_t watchdog_usec, |
7cae38c4 LP |
1191 | const char *home, |
1192 | const char *username, | |
1193 | const char *shell, | |
1194 | char ***ret) { | |
1195 | ||
1196 | _cleanup_strv_free_ char **our_env = NULL; | |
1197 | unsigned n_env = 0; | |
1198 | char *x; | |
1199 | ||
1200 | assert(c); | |
1201 | assert(ret); | |
1202 | ||
09812eb7 | 1203 | our_env = new0(char*, 10); |
7cae38c4 LP |
1204 | if (!our_env) |
1205 | return -ENOMEM; | |
1206 | ||
1207 | if (n_fds > 0) { | |
ccd06097 | 1208 | if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0) |
7cae38c4 LP |
1209 | return -ENOMEM; |
1210 | our_env[n_env++] = x; | |
1211 | ||
1212 | if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0) | |
1213 | return -ENOMEM; | |
1214 | our_env[n_env++] = x; | |
1215 | } | |
1216 | ||
09812eb7 | 1217 | if (watchdog_usec > 0) { |
ccd06097 | 1218 | if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0) |
09812eb7 LP |
1219 | return -ENOMEM; |
1220 | our_env[n_env++] = x; | |
1221 | ||
de0671ee | 1222 | if (asprintf(&x, "WATCHDOG_USEC="USEC_FMT, watchdog_usec) < 0) |
09812eb7 LP |
1223 | return -ENOMEM; |
1224 | our_env[n_env++] = x; | |
1225 | } | |
1226 | ||
7cae38c4 LP |
1227 | if (home) { |
1228 | x = strappend("HOME=", home); | |
1229 | if (!x) | |
1230 | return -ENOMEM; | |
1231 | our_env[n_env++] = x; | |
1232 | } | |
1233 | ||
1234 | if (username) { | |
1235 | x = strappend("LOGNAME=", username); | |
1236 | if (!x) | |
1237 | return -ENOMEM; | |
1238 | our_env[n_env++] = x; | |
1239 | ||
1240 | x = strappend("USER=", username); | |
1241 | if (!x) | |
1242 | return -ENOMEM; | |
1243 | our_env[n_env++] = x; | |
1244 | } | |
1245 | ||
1246 | if (shell) { | |
1247 | x = strappend("SHELL=", shell); | |
1248 | if (!x) | |
1249 | return -ENOMEM; | |
1250 | our_env[n_env++] = x; | |
1251 | } | |
1252 | ||
1253 | if (is_terminal_input(c->std_input) || | |
1254 | c->std_output == EXEC_OUTPUT_TTY || | |
1255 | c->std_error == EXEC_OUTPUT_TTY || | |
1256 | c->tty_path) { | |
1257 | ||
1258 | x = strdup(default_term_for_tty(tty_path(c))); | |
1259 | if (!x) | |
1260 | return -ENOMEM; | |
1261 | our_env[n_env++] = x; | |
1262 | } | |
1263 | ||
1264 | our_env[n_env++] = NULL; | |
09812eb7 | 1265 | assert(n_env <= 10); |
7cae38c4 LP |
1266 | |
1267 | *ret = our_env; | |
1268 | our_env = NULL; | |
1269 | ||
1270 | return 0; | |
1271 | } | |
1272 | ||
8b44a3d2 LP |
1273 | static bool exec_needs_mount_namespace( |
1274 | const ExecContext *context, | |
1275 | const ExecParameters *params, | |
1276 | ExecRuntime *runtime) { | |
1277 | ||
1278 | assert(context); | |
1279 | assert(params); | |
1280 | ||
1281 | if (!strv_isempty(context->read_write_dirs) || | |
1282 | !strv_isempty(context->read_only_dirs) || | |
1283 | !strv_isempty(context->inaccessible_dirs)) | |
1284 | return true; | |
1285 | ||
1286 | if (context->mount_flags != 0) | |
1287 | return true; | |
1288 | ||
1289 | if (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) | |
1290 | return true; | |
1291 | ||
1292 | if (params->bus_endpoint_path) | |
1293 | return true; | |
1294 | ||
1295 | if (context->private_devices || | |
1296 | context->protect_system != PROTECT_SYSTEM_NO || | |
1297 | context->protect_home != PROTECT_HOME_NO) | |
1298 | return true; | |
1299 | ||
1300 | return false; | |
1301 | } | |
1302 | ||
ff0af2a1 | 1303 | static int exec_child( |
f2341e0a | 1304 | Unit *unit, |
ff0af2a1 LP |
1305 | ExecCommand *command, |
1306 | const ExecContext *context, | |
1307 | const ExecParameters *params, | |
1308 | ExecRuntime *runtime, | |
1309 | char **argv, | |
1310 | int socket_fd, | |
1311 | int *fds, unsigned n_fds, | |
1312 | char **files_env, | |
1313 | int *exit_status) { | |
d35fbf6b DM |
1314 | |
1315 | _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL; | |
9008e1ac | 1316 | _cleanup_free_ char *mac_selinux_context_net = NULL; |
d35fbf6b DM |
1317 | const char *username = NULL, *home = NULL, *shell = NULL; |
1318 | unsigned n_dont_close = 0; | |
e44da745 | 1319 | int dont_close[n_fds + 4]; |
fed1e721 LP |
1320 | uid_t uid = UID_INVALID; |
1321 | gid_t gid = GID_INVALID; | |
ff0af2a1 | 1322 | int i, r; |
ee818b89 | 1323 | bool needs_mount_namespace; |
034c6ed7 | 1324 | |
f2341e0a | 1325 | assert(unit); |
5cb5a6ff LP |
1326 | assert(command); |
1327 | assert(context); | |
d35fbf6b | 1328 | assert(params); |
ff0af2a1 | 1329 | assert(exit_status); |
d35fbf6b DM |
1330 | |
1331 | rename_process_from_path(command->path); | |
1332 | ||
1333 | /* We reset exactly these signals, since they are the | |
1334 | * only ones we set to SIG_IGN in the main daemon. All | |
1335 | * others we leave untouched because we set them to | |
1336 | * SIG_DFL or a valid handler initially, both of which | |
1337 | * will be demoted to SIG_DFL. */ | |
ce30c8dc LP |
1338 | (void) default_signals(SIGNALS_CRASH_HANDLER, |
1339 | SIGNALS_IGNORE, -1); | |
d35fbf6b DM |
1340 | |
1341 | if (context->ignore_sigpipe) | |
ce30c8dc | 1342 | (void) ignore_signals(SIGPIPE, -1); |
d35fbf6b | 1343 | |
ff0af2a1 LP |
1344 | r = reset_signal_mask(); |
1345 | if (r < 0) { | |
1346 | *exit_status = EXIT_SIGNAL_MASK; | |
1347 | return r; | |
d35fbf6b | 1348 | } |
034c6ed7 | 1349 | |
d35fbf6b DM |
1350 | if (params->idle_pipe) |
1351 | do_idle_pipe_dance(params->idle_pipe); | |
4f2d528d | 1352 | |
d35fbf6b DM |
1353 | /* Close sockets very early to make sure we don't |
1354 | * block init reexecution because it cannot bind its | |
1355 | * sockets */ | |
ff0af2a1 | 1356 | |
d35fbf6b | 1357 | log_forget_fds(); |
4f2d528d | 1358 | |
d35fbf6b DM |
1359 | if (socket_fd >= 0) |
1360 | dont_close[n_dont_close++] = socket_fd; | |
1361 | if (n_fds > 0) { | |
1362 | memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds); | |
1363 | n_dont_close += n_fds; | |
1364 | } | |
e44da745 DM |
1365 | if (params->bus_endpoint_fd >= 0) |
1366 | dont_close[n_dont_close++] = params->bus_endpoint_fd; | |
d35fbf6b DM |
1367 | if (runtime) { |
1368 | if (runtime->netns_storage_socket[0] >= 0) | |
1369 | dont_close[n_dont_close++] = runtime->netns_storage_socket[0]; | |
1370 | if (runtime->netns_storage_socket[1] >= 0) | |
1371 | dont_close[n_dont_close++] = runtime->netns_storage_socket[1]; | |
9fa95f85 | 1372 | } |
4f2d528d | 1373 | |
ff0af2a1 LP |
1374 | r = close_all_fds(dont_close, n_dont_close); |
1375 | if (r < 0) { | |
1376 | *exit_status = EXIT_FDS; | |
1377 | return r; | |
8c7be95e LP |
1378 | } |
1379 | ||
d35fbf6b DM |
1380 | if (!context->same_pgrp) |
1381 | if (setsid() < 0) { | |
ff0af2a1 | 1382 | *exit_status = EXIT_SETSID; |
d35fbf6b DM |
1383 | return -errno; |
1384 | } | |
9e2f7c11 | 1385 | |
d35fbf6b DM |
1386 | exec_context_tty_reset(context); |
1387 | ||
1388 | if (params->confirm_spawn) { | |
1389 | char response; | |
1390 | ||
ff0af2a1 LP |
1391 | r = ask_for_confirmation(&response, argv); |
1392 | if (r == -ETIMEDOUT) | |
d35fbf6b | 1393 | write_confirm_message("Confirmation question timed out, assuming positive response.\n"); |
ff0af2a1 LP |
1394 | else if (r < 0) |
1395 | write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-r)); | |
d35fbf6b DM |
1396 | else if (response == 's') { |
1397 | write_confirm_message("Skipping execution.\n"); | |
ff0af2a1 | 1398 | *exit_status = EXIT_CONFIRM; |
d35fbf6b DM |
1399 | return -ECANCELED; |
1400 | } else if (response == 'n') { | |
1401 | write_confirm_message("Failing execution.\n"); | |
ff0af2a1 | 1402 | *exit_status = 0; |
d35fbf6b DM |
1403 | return 0; |
1404 | } | |
1405 | } | |
1a63a750 | 1406 | |
524daa8c ZJS |
1407 | if (context->user) { |
1408 | username = context->user; | |
ff0af2a1 LP |
1409 | r = get_user_creds(&username, &uid, &gid, &home, &shell); |
1410 | if (r < 0) { | |
1411 | *exit_status = EXIT_USER; | |
1412 | return r; | |
524daa8c ZJS |
1413 | } |
1414 | } | |
1415 | ||
d35fbf6b DM |
1416 | /* If a socket is connected to STDIN/STDOUT/STDERR, we |
1417 | * must sure to drop O_NONBLOCK */ | |
1418 | if (socket_fd >= 0) | |
1419 | fd_nonblock(socket_fd, false); | |
acbb0225 | 1420 | |
ff0af2a1 LP |
1421 | r = setup_input(context, socket_fd, params->apply_tty_stdin); |
1422 | if (r < 0) { | |
1423 | *exit_status = EXIT_STDIN; | |
1424 | return r; | |
d35fbf6b | 1425 | } |
034c6ed7 | 1426 | |
f2341e0a | 1427 | r = setup_output(unit, context, STDOUT_FILENO, socket_fd, basename(command->path), params->apply_tty_stdin, uid, gid); |
ff0af2a1 LP |
1428 | if (r < 0) { |
1429 | *exit_status = EXIT_STDOUT; | |
1430 | return r; | |
d35fbf6b DM |
1431 | } |
1432 | ||
f2341e0a | 1433 | r = setup_output(unit, context, STDERR_FILENO, socket_fd, basename(command->path), params->apply_tty_stdin, uid, gid); |
ff0af2a1 LP |
1434 | if (r < 0) { |
1435 | *exit_status = EXIT_STDERR; | |
1436 | return r; | |
d35fbf6b DM |
1437 | } |
1438 | ||
1439 | if (params->cgroup_path) { | |
ff0af2a1 LP |
1440 | r = cg_attach_everywhere(params->cgroup_supported, params->cgroup_path, 0, NULL, NULL); |
1441 | if (r < 0) { | |
1442 | *exit_status = EXIT_CGROUP; | |
1443 | return r; | |
309bff19 | 1444 | } |
d35fbf6b | 1445 | } |
309bff19 | 1446 | |
d35fbf6b | 1447 | if (context->oom_score_adjust_set) { |
d5243d62 | 1448 | char t[DECIMAL_STR_MAX(context->oom_score_adjust)]; |
f2b68789 | 1449 | |
d5243d62 LP |
1450 | /* When we can't make this change due to EPERM, then |
1451 | * let's silently skip over it. User namespaces | |
1452 | * prohibit write access to this file, and we | |
1453 | * shouldn't trip up over that. */ | |
613b411c | 1454 | |
d5243d62 | 1455 | sprintf(t, "%i", context->oom_score_adjust); |
ad118bda | 1456 | r = write_string_file("/proc/self/oom_score_adj", t, 0); |
6cb7fa17 | 1457 | if (r == -EPERM || r == -EACCES) { |
ff0af2a1 | 1458 | log_open(); |
f2341e0a | 1459 | log_unit_debug_errno(unit, r, "Failed to adjust OOM setting, assuming containerized execution, ignoring: %m"); |
ff0af2a1 LP |
1460 | log_close(); |
1461 | } else if (r < 0) { | |
1462 | *exit_status = EXIT_OOM_ADJUST; | |
d35fbf6b | 1463 | return -errno; |
613b411c | 1464 | } |
d35fbf6b DM |
1465 | } |
1466 | ||
1467 | if (context->nice_set) | |
1468 | if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) { | |
ff0af2a1 | 1469 | *exit_status = EXIT_NICE; |
d35fbf6b | 1470 | return -errno; |
613b411c LP |
1471 | } |
1472 | ||
d35fbf6b DM |
1473 | if (context->cpu_sched_set) { |
1474 | struct sched_param param = { | |
1475 | .sched_priority = context->cpu_sched_priority, | |
1476 | }; | |
1477 | ||
ff0af2a1 LP |
1478 | r = sched_setscheduler(0, |
1479 | context->cpu_sched_policy | | |
1480 | (context->cpu_sched_reset_on_fork ? | |
1481 | SCHED_RESET_ON_FORK : 0), | |
1482 | ¶m); | |
1483 | if (r < 0) { | |
1484 | *exit_status = EXIT_SETSCHEDULER; | |
d35fbf6b | 1485 | return -errno; |
fc9b2a84 | 1486 | } |
d35fbf6b | 1487 | } |
fc9b2a84 | 1488 | |
d35fbf6b DM |
1489 | if (context->cpuset) |
1490 | if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) { | |
ff0af2a1 | 1491 | *exit_status = EXIT_CPUAFFINITY; |
d35fbf6b | 1492 | return -errno; |
034c6ed7 LP |
1493 | } |
1494 | ||
d35fbf6b DM |
1495 | if (context->ioprio_set) |
1496 | if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) { | |
ff0af2a1 | 1497 | *exit_status = EXIT_IOPRIO; |
d35fbf6b DM |
1498 | return -errno; |
1499 | } | |
da726a4d | 1500 | |
d35fbf6b DM |
1501 | if (context->timer_slack_nsec != NSEC_INFINITY) |
1502 | if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) { | |
ff0af2a1 | 1503 | *exit_status = EXIT_TIMERSLACK; |
d35fbf6b | 1504 | return -errno; |
4c2630eb | 1505 | } |
9eba9da4 | 1506 | |
050f7277 | 1507 | if (context->personality != PERSONALITY_INVALID) |
d35fbf6b | 1508 | if (personality(context->personality) < 0) { |
ff0af2a1 | 1509 | *exit_status = EXIT_PERSONALITY; |
d35fbf6b | 1510 | return -errno; |
4c2630eb | 1511 | } |
94f04347 | 1512 | |
d35fbf6b | 1513 | if (context->utmp_id) |
023a4f67 LP |
1514 | utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path, |
1515 | context->utmp_mode == EXEC_UTMP_INIT ? INIT_PROCESS : | |
1516 | context->utmp_mode == EXEC_UTMP_LOGIN ? LOGIN_PROCESS : | |
1517 | USER_PROCESS, | |
1518 | username ? "root" : context->user); | |
d35fbf6b | 1519 | |
524daa8c | 1520 | if (context->user && is_terminal_input(context->std_input)) { |
ff0af2a1 LP |
1521 | r = chown_terminal(STDIN_FILENO, uid); |
1522 | if (r < 0) { | |
1523 | *exit_status = EXIT_STDIN; | |
1524 | return r; | |
071830ff | 1525 | } |
d35fbf6b | 1526 | } |
8e274523 | 1527 | |
e44da745 | 1528 | if (params->bus_endpoint_fd >= 0 && context->bus_endpoint) { |
fed1e721 | 1529 | uid_t ep_uid = (uid == UID_INVALID) ? 0 : uid; |
e44da745 | 1530 | |
ff0af2a1 LP |
1531 | r = bus_kernel_set_endpoint_policy(params->bus_endpoint_fd, ep_uid, context->bus_endpoint); |
1532 | if (r < 0) { | |
1533 | *exit_status = EXIT_BUS_ENDPOINT; | |
1534 | return r; | |
e44da745 DM |
1535 | } |
1536 | } | |
e44da745 | 1537 | |
a931ad47 LP |
1538 | /* If delegation is enabled we'll pass ownership of the cgroup |
1539 | * (but only in systemd's own controller hierarchy!) to the | |
1540 | * user of the new process. */ | |
1541 | if (params->cgroup_path && context->user && params->cgroup_delegate) { | |
ff0af2a1 LP |
1542 | r = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0644, uid, gid); |
1543 | if (r < 0) { | |
1544 | *exit_status = EXIT_CGROUP; | |
1545 | return r; | |
d35fbf6b | 1546 | } |
034c6ed7 | 1547 | |
034c6ed7 | 1548 | |
ff0af2a1 LP |
1549 | r = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0755, uid, gid); |
1550 | if (r < 0) { | |
1551 | *exit_status = EXIT_CGROUP; | |
1552 | return r; | |
034c6ed7 | 1553 | } |
d35fbf6b | 1554 | } |
034c6ed7 | 1555 | |
d35fbf6b DM |
1556 | if (!strv_isempty(context->runtime_directory) && params->runtime_prefix) { |
1557 | char **rt; | |
fb33a393 | 1558 | |
d35fbf6b DM |
1559 | STRV_FOREACH(rt, context->runtime_directory) { |
1560 | _cleanup_free_ char *p; | |
94f04347 | 1561 | |
d35fbf6b DM |
1562 | p = strjoin(params->runtime_prefix, "/", *rt, NULL); |
1563 | if (!p) { | |
ff0af2a1 | 1564 | *exit_status = EXIT_RUNTIME_DIRECTORY; |
d35fbf6b | 1565 | return -ENOMEM; |
94f04347 | 1566 | } |
94f04347 | 1567 | |
6bfe5c28 LP |
1568 | r = mkdir_p_label(p, context->runtime_directory_mode); |
1569 | if (r < 0) { | |
1570 | *exit_status = EXIT_RUNTIME_DIRECTORY; | |
1571 | return r; | |
1572 | } | |
1573 | ||
1574 | r = chmod_and_chown(p, context->runtime_directory_mode, uid, gid); | |
ff0af2a1 LP |
1575 | if (r < 0) { |
1576 | *exit_status = EXIT_RUNTIME_DIRECTORY; | |
1577 | return r; | |
94f04347 | 1578 | } |
d35fbf6b DM |
1579 | } |
1580 | } | |
94f04347 | 1581 | |
d35fbf6b | 1582 | if (params->apply_permissions) { |
ff0af2a1 LP |
1583 | r = enforce_groups(context, username, gid); |
1584 | if (r < 0) { | |
1585 | *exit_status = EXIT_GROUP; | |
1586 | return r; | |
d35fbf6b DM |
1587 | } |
1588 | } | |
9eba9da4 | 1589 | |
d35fbf6b | 1590 | umask(context->umask); |
94f04347 | 1591 | |
d35fbf6b DM |
1592 | #ifdef HAVE_PAM |
1593 | if (params->apply_permissions && context->pam_name && username) { | |
ff0af2a1 LP |
1594 | r = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds); |
1595 | if (r < 0) { | |
1596 | *exit_status = EXIT_PAM; | |
1597 | return r; | |
d35fbf6b DM |
1598 | } |
1599 | } | |
1600 | #endif | |
ac45f971 | 1601 | |
d35fbf6b | 1602 | if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) { |
ff0af2a1 LP |
1603 | r = setup_netns(runtime->netns_storage_socket); |
1604 | if (r < 0) { | |
1605 | *exit_status = EXIT_NETWORK; | |
1606 | return r; | |
d35fbf6b DM |
1607 | } |
1608 | } | |
169c1bda | 1609 | |
ee818b89 AC |
1610 | needs_mount_namespace = exec_needs_mount_namespace(context, params, runtime); |
1611 | ||
1612 | if (needs_mount_namespace) { | |
d35fbf6b DM |
1613 | char *tmp = NULL, *var = NULL; |
1614 | ||
1615 | /* The runtime struct only contains the parent | |
1616 | * of the private /tmp, which is | |
1617 | * non-accessible to world users. Inside of it | |
1618 | * there's a /tmp that is sticky, and that's | |
1619 | * the one we want to use here. */ | |
1620 | ||
1621 | if (context->private_tmp && runtime) { | |
1622 | if (runtime->tmp_dir) | |
63c372cb | 1623 | tmp = strjoina(runtime->tmp_dir, "/tmp"); |
d35fbf6b | 1624 | if (runtime->var_tmp_dir) |
63c372cb | 1625 | var = strjoina(runtime->var_tmp_dir, "/tmp"); |
d35fbf6b | 1626 | } |
d8b4e2e9 | 1627 | |
ff0af2a1 | 1628 | r = setup_namespace( |
ee818b89 | 1629 | params->apply_chroot ? context->root_directory : NULL, |
d35fbf6b DM |
1630 | context->read_write_dirs, |
1631 | context->read_only_dirs, | |
1632 | context->inaccessible_dirs, | |
1633 | tmp, | |
1634 | var, | |
e44da745 | 1635 | params->bus_endpoint_path, |
d35fbf6b DM |
1636 | context->private_devices, |
1637 | context->protect_home, | |
1638 | context->protect_system, | |
1639 | context->mount_flags); | |
0015ebf3 | 1640 | |
ff0af2a1 LP |
1641 | /* If we couldn't set up the namespace this is |
1642 | * probably due to a missing capability. In this case, | |
1643 | * silently proceeed. */ | |
1644 | if (r == -EPERM || r == -EACCES) { | |
1645 | log_open(); | |
f2341e0a | 1646 | log_unit_debug_errno(unit, r, "Failed to set up namespace, assuming containerized execution, ignoring: %m"); |
ff0af2a1 LP |
1647 | log_close(); |
1648 | } else if (r < 0) { | |
1649 | *exit_status = EXIT_NAMESPACE; | |
1650 | return r; | |
81a2b7ce | 1651 | } |
d35fbf6b | 1652 | } |
81a2b7ce | 1653 | |
d35fbf6b | 1654 | if (params->apply_chroot) { |
ee818b89 | 1655 | if (!needs_mount_namespace && context->root_directory) |
d35fbf6b | 1656 | if (chroot(context->root_directory) < 0) { |
ff0af2a1 | 1657 | *exit_status = EXIT_CHROOT; |
d35fbf6b | 1658 | return -errno; |
8aa75193 LP |
1659 | } |
1660 | ||
4c08c824 LP |
1661 | if (chdir(context->working_directory ?: "/") < 0 && |
1662 | !context->working_directory_missing_ok) { | |
ff0af2a1 | 1663 | *exit_status = EXIT_CHDIR; |
d35fbf6b DM |
1664 | return -errno; |
1665 | } | |
1666 | } else { | |
1667 | _cleanup_free_ char *d = NULL; | |
8aa75193 | 1668 | |
d35fbf6b | 1669 | if (asprintf(&d, "%s/%s", |
cf1d0302 LP |
1670 | context->root_directory ?: "", |
1671 | context->working_directory ?: "") < 0) { | |
ff0af2a1 | 1672 | *exit_status = EXIT_MEMORY; |
d35fbf6b | 1673 | return -ENOMEM; |
8aa75193 | 1674 | } |
8aa75193 | 1675 | |
cf1d0302 LP |
1676 | if (chdir(d) < 0 && |
1677 | !context->working_directory_missing_ok) { | |
ff0af2a1 | 1678 | *exit_status = EXIT_CHDIR; |
d35fbf6b DM |
1679 | return -errno; |
1680 | } | |
1681 | } | |
e66cf1a3 | 1682 | |
9008e1ac MS |
1683 | #ifdef HAVE_SELINUX |
1684 | if (params->apply_permissions && mac_selinux_use() && params->selinux_context_net && socket_fd >= 0) { | |
ff0af2a1 LP |
1685 | r = mac_selinux_get_child_mls_label(socket_fd, command->path, context->selinux_context, &mac_selinux_context_net); |
1686 | if (r < 0) { | |
1687 | *exit_status = EXIT_SELINUX_CONTEXT; | |
1688 | return r; | |
9008e1ac MS |
1689 | } |
1690 | } | |
1691 | #endif | |
1692 | ||
d35fbf6b DM |
1693 | /* We repeat the fd closing here, to make sure that |
1694 | * nothing is leaked from the PAM modules. Note that | |
1695 | * we are more aggressive this time since socket_fd | |
e44da745 DM |
1696 | * and the netns fds we don't need anymore. The custom |
1697 | * endpoint fd was needed to upload the policy and can | |
1698 | * now be closed as well. */ | |
ff0af2a1 LP |
1699 | r = close_all_fds(fds, n_fds); |
1700 | if (r >= 0) | |
1701 | r = shift_fds(fds, n_fds); | |
1702 | if (r >= 0) | |
1703 | r = flags_fds(fds, n_fds, context->non_blocking); | |
1704 | if (r < 0) { | |
1705 | *exit_status = EXIT_FDS; | |
1706 | return r; | |
d35fbf6b | 1707 | } |
e66cf1a3 | 1708 | |
d35fbf6b | 1709 | if (params->apply_permissions) { |
e66cf1a3 | 1710 | |
d35fbf6b DM |
1711 | for (i = 0; i < _RLIMIT_MAX; i++) { |
1712 | if (!context->rlimit[i]) | |
1713 | continue; | |
1714 | ||
1715 | if (setrlimit_closest(i, context->rlimit[i]) < 0) { | |
ff0af2a1 | 1716 | *exit_status = EXIT_LIMITS; |
d35fbf6b | 1717 | return -errno; |
e66cf1a3 LP |
1718 | } |
1719 | } | |
1720 | ||
d35fbf6b | 1721 | if (context->capability_bounding_set_drop) { |
ff0af2a1 LP |
1722 | r = capability_bounding_set_drop(context->capability_bounding_set_drop, false); |
1723 | if (r < 0) { | |
1724 | *exit_status = EXIT_CAPABILITIES; | |
1725 | return r; | |
3b8bddde | 1726 | } |
4c2630eb | 1727 | } |
3b8bddde | 1728 | |
2ca620c4 WC |
1729 | #ifdef HAVE_SMACK |
1730 | if (context->smack_process_label) { | |
ff0af2a1 LP |
1731 | r = mac_smack_apply_pid(0, context->smack_process_label); |
1732 | if (r < 0) { | |
1733 | *exit_status = EXIT_SMACK_PROCESS_LABEL; | |
1734 | return r; | |
2ca620c4 WC |
1735 | } |
1736 | } | |
e174dce2 WC |
1737 | #ifdef SMACK_DEFAULT_PROCESS_LABEL |
1738 | else { | |
e419a0e3 WC |
1739 | _cleanup_free_ char *exec_label = NULL; |
1740 | ||
1741 | r = mac_smack_read(command->path, SMACK_ATTR_EXEC, &exec_label); | |
1742 | if (r < 0 && r != -ENODATA && r != -EOPNOTSUPP) { | |
1743 | *exit_status = EXIT_SMACK_PROCESS_LABEL; | |
1744 | return r; | |
1745 | } | |
1746 | ||
1747 | r = mac_smack_apply_pid(0, exec_label ? : SMACK_DEFAULT_PROCESS_LABEL); | |
e174dce2 WC |
1748 | if (r < 0) { |
1749 | *exit_status = EXIT_SMACK_PROCESS_LABEL; | |
1750 | return r; | |
1751 | } | |
1752 | } | |
1753 | #endif | |
2ca620c4 WC |
1754 | #endif |
1755 | ||
d35fbf6b | 1756 | if (context->user) { |
ff0af2a1 LP |
1757 | r = enforce_user(context, uid); |
1758 | if (r < 0) { | |
1759 | *exit_status = EXIT_USER; | |
1760 | return r; | |
5b6319dc LP |
1761 | } |
1762 | } | |
d35fbf6b DM |
1763 | |
1764 | /* PR_GET_SECUREBITS is not privileged, while | |
1765 | * PR_SET_SECUREBITS is. So to suppress | |
1766 | * potential EPERMs we'll try not to call | |
1767 | * PR_SET_SECUREBITS unless necessary. */ | |
1768 | if (prctl(PR_GET_SECUREBITS) != context->secure_bits) | |
1769 | if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) { | |
ff0af2a1 | 1770 | *exit_status = EXIT_SECUREBITS; |
d35fbf6b | 1771 | return -errno; |
ff01d048 | 1772 | } |
5b6319dc | 1773 | |
d35fbf6b DM |
1774 | if (context->capabilities) |
1775 | if (cap_set_proc(context->capabilities) < 0) { | |
ff0af2a1 | 1776 | *exit_status = EXIT_CAPABILITIES; |
d35fbf6b | 1777 | return -errno; |
613b411c LP |
1778 | } |
1779 | ||
d35fbf6b DM |
1780 | if (context->no_new_privileges) |
1781 | if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) { | |
ff0af2a1 | 1782 | *exit_status = EXIT_NO_NEW_PRIVILEGES; |
d35fbf6b DM |
1783 | return -errno; |
1784 | } | |
1785 | ||
1786 | #ifdef HAVE_SECCOMP | |
1787 | if (context->address_families_whitelist || | |
1788 | !set_isempty(context->address_families)) { | |
ff0af2a1 LP |
1789 | r = apply_address_families(context); |
1790 | if (r < 0) { | |
1791 | *exit_status = EXIT_ADDRESS_FAMILIES; | |
1792 | return r; | |
4c2630eb MS |
1793 | } |
1794 | } | |
04aa0cb9 | 1795 | |
d35fbf6b DM |
1796 | if (context->syscall_whitelist || |
1797 | !set_isempty(context->syscall_filter) || | |
1798 | !set_isempty(context->syscall_archs)) { | |
ff0af2a1 LP |
1799 | r = apply_seccomp(context); |
1800 | if (r < 0) { | |
1801 | *exit_status = EXIT_SECCOMP; | |
1802 | return r; | |
81a2b7ce | 1803 | } |
d35fbf6b DM |
1804 | } |
1805 | #endif | |
81a2b7ce | 1806 | |
d35fbf6b | 1807 | #ifdef HAVE_SELINUX |
6baa7db0 | 1808 | if (mac_selinux_use()) { |
9008e1ac | 1809 | char *exec_context = mac_selinux_context_net ?: context->selinux_context; |
16115b0a | 1810 | |
9008e1ac | 1811 | if (exec_context) { |
ff0af2a1 LP |
1812 | r = setexeccon(exec_context); |
1813 | if (r < 0) { | |
1814 | *exit_status = EXIT_SELINUX_CONTEXT; | |
1815 | return r; | |
16115b0a | 1816 | } |
81a2b7ce | 1817 | } |
81a2b7ce | 1818 | } |
d35fbf6b | 1819 | #endif |
81a2b7ce | 1820 | |
d35fbf6b | 1821 | #ifdef HAVE_APPARMOR |
6baa7db0 | 1822 | if (context->apparmor_profile && mac_apparmor_use()) { |
ff0af2a1 LP |
1823 | r = aa_change_onexec(context->apparmor_profile); |
1824 | if (r < 0 && !context->apparmor_profile_ignore) { | |
1825 | *exit_status = EXIT_APPARMOR_PROFILE; | |
5482192e | 1826 | return -errno; |
d35fbf6b | 1827 | } |
034c6ed7 | 1828 | } |
d35fbf6b DM |
1829 | #endif |
1830 | } | |
034c6ed7 | 1831 | |
ff0af2a1 LP |
1832 | r = build_environment(context, n_fds, params->watchdog_usec, home, username, shell, &our_env); |
1833 | if (r < 0) { | |
1834 | *exit_status = EXIT_MEMORY; | |
1835 | return r; | |
d35fbf6b | 1836 | } |
034c6ed7 | 1837 | |
d35fbf6b DM |
1838 | final_env = strv_env_merge(5, |
1839 | params->environment, | |
1840 | our_env, | |
1841 | context->environment, | |
1842 | files_env, | |
1843 | pam_env, | |
1844 | NULL); | |
1845 | if (!final_env) { | |
ff0af2a1 | 1846 | *exit_status = EXIT_MEMORY; |
d35fbf6b DM |
1847 | return -ENOMEM; |
1848 | } | |
81a2b7ce | 1849 | |
d35fbf6b DM |
1850 | final_argv = replace_env_argv(argv, final_env); |
1851 | if (!final_argv) { | |
ff0af2a1 | 1852 | *exit_status = EXIT_MEMORY; |
d35fbf6b DM |
1853 | return -ENOMEM; |
1854 | } | |
034c6ed7 | 1855 | |
d35fbf6b | 1856 | final_env = strv_env_clean(final_env); |
260abb78 | 1857 | |
553d2243 | 1858 | if (_unlikely_(log_get_max_level() >= LOG_DEBUG)) { |
d35fbf6b | 1859 | _cleanup_free_ char *line; |
81a2b7ce | 1860 | |
d35fbf6b DM |
1861 | line = exec_command_line(final_argv); |
1862 | if (line) { | |
1863 | log_open(); | |
f2341e0a LP |
1864 | log_struct(LOG_DEBUG, |
1865 | LOG_UNIT_ID(unit), | |
1866 | "EXECUTABLE=%s", command->path, | |
1867 | LOG_UNIT_MESSAGE(unit, "Executing: %s", line), | |
1868 | NULL); | |
d35fbf6b DM |
1869 | log_close(); |
1870 | } | |
1871 | } | |
dd305ec9 | 1872 | |
d35fbf6b | 1873 | execve(command->path, final_argv, final_env); |
ff0af2a1 | 1874 | *exit_status = EXIT_EXEC; |
d35fbf6b DM |
1875 | return -errno; |
1876 | } | |
81a2b7ce | 1877 | |
f2341e0a LP |
1878 | int exec_spawn(Unit *unit, |
1879 | ExecCommand *command, | |
d35fbf6b DM |
1880 | const ExecContext *context, |
1881 | const ExecParameters *params, | |
1882 | ExecRuntime *runtime, | |
1883 | pid_t *ret) { | |
8351ceae | 1884 | |
d35fbf6b DM |
1885 | _cleanup_strv_free_ char **files_env = NULL; |
1886 | int *fds = NULL; unsigned n_fds = 0; | |
ff0af2a1 LP |
1887 | _cleanup_free_ char *line = NULL; |
1888 | int socket_fd, r; | |
1889 | char **argv; | |
d35fbf6b | 1890 | pid_t pid; |
8351ceae | 1891 | |
f2341e0a | 1892 | assert(unit); |
d35fbf6b DM |
1893 | assert(command); |
1894 | assert(context); | |
1895 | assert(ret); | |
1896 | assert(params); | |
1897 | assert(params->fds || params->n_fds <= 0); | |
4298d0b5 | 1898 | |
d35fbf6b DM |
1899 | if (context->std_input == EXEC_INPUT_SOCKET || |
1900 | context->std_output == EXEC_OUTPUT_SOCKET || | |
1901 | context->std_error == EXEC_OUTPUT_SOCKET) { | |
17df7223 | 1902 | |
ff0af2a1 | 1903 | if (params->n_fds != 1) { |
f2341e0a | 1904 | log_unit_error(unit, "Got more than one socket."); |
d35fbf6b | 1905 | return -EINVAL; |
ff0af2a1 | 1906 | } |
eef65bf3 | 1907 | |
d35fbf6b DM |
1908 | socket_fd = params->fds[0]; |
1909 | } else { | |
1910 | socket_fd = -1; | |
1911 | fds = params->fds; | |
1912 | n_fds = params->n_fds; | |
1913 | } | |
94f04347 | 1914 | |
f2341e0a | 1915 | r = exec_context_load_environment(unit, context, &files_env); |
ff0af2a1 | 1916 | if (r < 0) |
f2341e0a | 1917 | return log_unit_error_errno(unit, r, "Failed to load environment files: %m"); |
034c6ed7 | 1918 | |
d35fbf6b | 1919 | argv = params->argv ?: command->argv; |
d35fbf6b DM |
1920 | line = exec_command_line(argv); |
1921 | if (!line) | |
1922 | return log_oom(); | |
fab56fc5 | 1923 | |
f2341e0a LP |
1924 | log_struct(LOG_DEBUG, |
1925 | LOG_UNIT_ID(unit), | |
1926 | LOG_UNIT_MESSAGE(unit, "About to execute: %s", line), | |
1927 | "EXECUTABLE=%s", command->path, | |
1928 | NULL); | |
d35fbf6b DM |
1929 | pid = fork(); |
1930 | if (pid < 0) | |
f2341e0a | 1931 | return log_unit_error_errno(unit, r, "Failed to fork: %m"); |
d35fbf6b DM |
1932 | |
1933 | if (pid == 0) { | |
ff0af2a1 LP |
1934 | int exit_status; |
1935 | ||
f2341e0a LP |
1936 | r = exec_child(unit, |
1937 | command, | |
ff0af2a1 LP |
1938 | context, |
1939 | params, | |
1940 | runtime, | |
1941 | argv, | |
1942 | socket_fd, | |
1943 | fds, n_fds, | |
1944 | files_env, | |
1945 | &exit_status); | |
1946 | if (r < 0) { | |
4c2630eb | 1947 | log_open(); |
f2341e0a LP |
1948 | log_struct_errno(LOG_ERR, r, |
1949 | LOG_MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED), | |
1950 | LOG_UNIT_ID(unit), | |
1951 | LOG_UNIT_MESSAGE(unit, "Failed at step %s spawning %s: %m", | |
1952 | exit_status_to_string(exit_status, EXIT_STATUS_SYSTEMD), | |
1953 | command->path), | |
1954 | "EXECUTABLE=%s", command->path, | |
1955 | NULL); | |
4c2630eb MS |
1956 | } |
1957 | ||
ff0af2a1 | 1958 | _exit(exit_status); |
034c6ed7 LP |
1959 | } |
1960 | ||
f2341e0a | 1961 | log_unit_debug(unit, "Forked %s as "PID_FMT, command->path, pid); |
23635a85 | 1962 | |
80876c20 LP |
1963 | /* We add the new process to the cgroup both in the child (so |
1964 | * that we can be sure that no user code is ever executed | |
1965 | * outside of the cgroup) and in the parent (so that we can be | |
1966 | * sure that when we kill the cgroup the process will be | |
1967 | * killed too). */ | |
d35fbf6b | 1968 | if (params->cgroup_path) |
dd305ec9 | 1969 | (void) cg_attach(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, pid); |
2da3263a | 1970 | |
b58b4116 | 1971 | exec_status_start(&command->exec_status, pid); |
9fb86720 | 1972 | |
034c6ed7 | 1973 | *ret = pid; |
5cb5a6ff LP |
1974 | return 0; |
1975 | } | |
1976 | ||
034c6ed7 LP |
1977 | void exec_context_init(ExecContext *c) { |
1978 | assert(c); | |
1979 | ||
4c12626c | 1980 | c->umask = 0022; |
9eba9da4 | 1981 | c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0); |
94f04347 | 1982 | c->cpu_sched_policy = SCHED_OTHER; |
071830ff | 1983 | c->syslog_priority = LOG_DAEMON|LOG_INFO; |
74922904 | 1984 | c->syslog_level_prefix = true; |
353e12c2 | 1985 | c->ignore_sigpipe = true; |
3a43da28 | 1986 | c->timer_slack_nsec = NSEC_INFINITY; |
050f7277 | 1987 | c->personality = PERSONALITY_INVALID; |
e66cf1a3 | 1988 | c->runtime_directory_mode = 0755; |
034c6ed7 LP |
1989 | } |
1990 | ||
613b411c | 1991 | void exec_context_done(ExecContext *c) { |
5cb5a6ff LP |
1992 | unsigned l; |
1993 | ||
1994 | assert(c); | |
1995 | ||
1996 | strv_free(c->environment); | |
034c6ed7 | 1997 | c->environment = NULL; |
5cb5a6ff | 1998 | |
8c7be95e LP |
1999 | strv_free(c->environment_files); |
2000 | c->environment_files = NULL; | |
2001 | ||
034c6ed7 | 2002 | for (l = 0; l < ELEMENTSOF(c->rlimit); l++) { |
a1e58e8e | 2003 | c->rlimit[l] = mfree(c->rlimit[l]); |
034c6ed7 LP |
2004 | } |
2005 | ||
a1e58e8e LP |
2006 | c->working_directory = mfree(c->working_directory); |
2007 | c->root_directory = mfree(c->root_directory); | |
2008 | c->tty_path = mfree(c->tty_path); | |
2009 | c->syslog_identifier = mfree(c->syslog_identifier); | |
2010 | c->user = mfree(c->user); | |
2011 | c->group = mfree(c->group); | |
034c6ed7 LP |
2012 | |
2013 | strv_free(c->supplementary_groups); | |
2014 | c->supplementary_groups = NULL; | |
94f04347 | 2015 | |
a1e58e8e | 2016 | c->pam_name = mfree(c->pam_name); |
5b6319dc | 2017 | |
94f04347 LP |
2018 | if (c->capabilities) { |
2019 | cap_free(c->capabilities); | |
2020 | c->capabilities = NULL; | |
2021 | } | |
15ae422b LP |
2022 | |
2023 | strv_free(c->read_only_dirs); | |
2024 | c->read_only_dirs = NULL; | |
2025 | ||
2026 | strv_free(c->read_write_dirs); | |
2027 | c->read_write_dirs = NULL; | |
2028 | ||
2029 | strv_free(c->inaccessible_dirs); | |
2030 | c->inaccessible_dirs = NULL; | |
82c121a4 LP |
2031 | |
2032 | if (c->cpuset) | |
2033 | CPU_FREE(c->cpuset); | |
86a3475b | 2034 | |
a1e58e8e LP |
2035 | c->utmp_id = mfree(c->utmp_id); |
2036 | c->selinux_context = mfree(c->selinux_context); | |
2037 | c->apparmor_profile = mfree(c->apparmor_profile); | |
eef65bf3 | 2038 | |
17df7223 LP |
2039 | set_free(c->syscall_filter); |
2040 | c->syscall_filter = NULL; | |
57183d11 LP |
2041 | |
2042 | set_free(c->syscall_archs); | |
2043 | c->syscall_archs = NULL; | |
4298d0b5 LP |
2044 | |
2045 | set_free(c->address_families); | |
2046 | c->address_families = NULL; | |
e66cf1a3 LP |
2047 | |
2048 | strv_free(c->runtime_directory); | |
2049 | c->runtime_directory = NULL; | |
bb7dd0b0 DM |
2050 | |
2051 | bus_endpoint_free(c->bus_endpoint); | |
2052 | c->bus_endpoint = NULL; | |
e66cf1a3 LP |
2053 | } |
2054 | ||
2055 | int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) { | |
2056 | char **i; | |
2057 | ||
2058 | assert(c); | |
2059 | ||
2060 | if (!runtime_prefix) | |
2061 | return 0; | |
2062 | ||
2063 | STRV_FOREACH(i, c->runtime_directory) { | |
2064 | _cleanup_free_ char *p; | |
2065 | ||
2066 | p = strjoin(runtime_prefix, "/", *i, NULL); | |
2067 | if (!p) | |
2068 | return -ENOMEM; | |
2069 | ||
2070 | /* We execute this synchronously, since we need to be | |
2071 | * sure this is gone when we start the service | |
2072 | * next. */ | |
c6878637 | 2073 | (void) rm_rf(p, REMOVE_ROOT); |
e66cf1a3 LP |
2074 | } |
2075 | ||
2076 | return 0; | |
5cb5a6ff LP |
2077 | } |
2078 | ||
43d0fcbd LP |
2079 | void exec_command_done(ExecCommand *c) { |
2080 | assert(c); | |
2081 | ||
a1e58e8e | 2082 | c->path = mfree(c->path); |
43d0fcbd LP |
2083 | |
2084 | strv_free(c->argv); | |
2085 | c->argv = NULL; | |
2086 | } | |
2087 | ||
2088 | void exec_command_done_array(ExecCommand *c, unsigned n) { | |
2089 | unsigned i; | |
2090 | ||
2091 | for (i = 0; i < n; i++) | |
2092 | exec_command_done(c+i); | |
2093 | } | |
2094 | ||
f1acf85a | 2095 | ExecCommand* exec_command_free_list(ExecCommand *c) { |
5cb5a6ff LP |
2096 | ExecCommand *i; |
2097 | ||
2098 | while ((i = c)) { | |
71fda00f | 2099 | LIST_REMOVE(command, c, i); |
43d0fcbd | 2100 | exec_command_done(i); |
5cb5a6ff LP |
2101 | free(i); |
2102 | } | |
f1acf85a ZJS |
2103 | |
2104 | return NULL; | |
5cb5a6ff LP |
2105 | } |
2106 | ||
034c6ed7 LP |
2107 | void exec_command_free_array(ExecCommand **c, unsigned n) { |
2108 | unsigned i; | |
2109 | ||
f1acf85a ZJS |
2110 | for (i = 0; i < n; i++) |
2111 | c[i] = exec_command_free_list(c[i]); | |
034c6ed7 LP |
2112 | } |
2113 | ||
039f0e70 | 2114 | typedef struct InvalidEnvInfo { |
f2341e0a | 2115 | Unit *unit; |
039f0e70 LP |
2116 | const char *path; |
2117 | } InvalidEnvInfo; | |
2118 | ||
2119 | static void invalid_env(const char *p, void *userdata) { | |
2120 | InvalidEnvInfo *info = userdata; | |
2121 | ||
f2341e0a | 2122 | log_unit_error(info->unit, "Ignoring invalid environment assignment '%s': %s", p, info->path); |
039f0e70 LP |
2123 | } |
2124 | ||
f2341e0a | 2125 | int exec_context_load_environment(Unit *unit, const ExecContext *c, char ***l) { |
8c7be95e LP |
2126 | char **i, **r = NULL; |
2127 | ||
2128 | assert(c); | |
2129 | assert(l); | |
2130 | ||
2131 | STRV_FOREACH(i, c->environment_files) { | |
2132 | char *fn; | |
2133 | int k; | |
2134 | bool ignore = false; | |
2135 | char **p; | |
7fd1b19b | 2136 | _cleanup_globfree_ glob_t pglob = {}; |
2bef10ab | 2137 | int count, n; |
8c7be95e LP |
2138 | |
2139 | fn = *i; | |
2140 | ||
2141 | if (fn[0] == '-') { | |
2142 | ignore = true; | |
2143 | fn ++; | |
2144 | } | |
2145 | ||
2146 | if (!path_is_absolute(fn)) { | |
8c7be95e LP |
2147 | if (ignore) |
2148 | continue; | |
2149 | ||
2150 | strv_free(r); | |
2151 | return -EINVAL; | |
2152 | } | |
2153 | ||
2bef10ab | 2154 | /* Filename supports globbing, take all matching files */ |
2bef10ab PL |
2155 | errno = 0; |
2156 | if (glob(fn, 0, NULL, &pglob) != 0) { | |
2bef10ab PL |
2157 | if (ignore) |
2158 | continue; | |
8c7be95e | 2159 | |
2bef10ab PL |
2160 | strv_free(r); |
2161 | return errno ? -errno : -EINVAL; | |
2162 | } | |
2163 | count = pglob.gl_pathc; | |
2164 | if (count == 0) { | |
8c7be95e LP |
2165 | if (ignore) |
2166 | continue; | |
2167 | ||
2168 | strv_free(r); | |
2bef10ab | 2169 | return -EINVAL; |
8c7be95e | 2170 | } |
2bef10ab | 2171 | for (n = 0; n < count; n++) { |
717603e3 | 2172 | k = load_env_file(NULL, pglob.gl_pathv[n], NULL, &p); |
2bef10ab PL |
2173 | if (k < 0) { |
2174 | if (ignore) | |
2175 | continue; | |
8c7be95e | 2176 | |
2bef10ab | 2177 | strv_free(r); |
2bef10ab | 2178 | return k; |
e9c1ea9d | 2179 | } |
ebc05a09 | 2180 | /* Log invalid environment variables with filename */ |
039f0e70 LP |
2181 | if (p) { |
2182 | InvalidEnvInfo info = { | |
f2341e0a | 2183 | .unit = unit, |
039f0e70 LP |
2184 | .path = pglob.gl_pathv[n] |
2185 | }; | |
2186 | ||
2187 | p = strv_env_clean_with_callback(p, invalid_env, &info); | |
2188 | } | |
8c7be95e | 2189 | |
2bef10ab PL |
2190 | if (r == NULL) |
2191 | r = p; | |
2192 | else { | |
2193 | char **m; | |
8c7be95e | 2194 | |
2bef10ab PL |
2195 | m = strv_env_merge(2, r, p); |
2196 | strv_free(r); | |
2197 | strv_free(p); | |
c84a9488 | 2198 | if (!m) |
2bef10ab | 2199 | return -ENOMEM; |
2bef10ab PL |
2200 | |
2201 | r = m; | |
2202 | } | |
8c7be95e LP |
2203 | } |
2204 | } | |
2205 | ||
2206 | *l = r; | |
2207 | ||
2208 | return 0; | |
2209 | } | |
2210 | ||
6ac8fdc9 | 2211 | static bool tty_may_match_dev_console(const char *tty) { |
e1d75803 | 2212 | _cleanup_free_ char *active = NULL; |
7d6884b6 | 2213 | char *console; |
6ac8fdc9 MS |
2214 | |
2215 | if (startswith(tty, "/dev/")) | |
2216 | tty += 5; | |
2217 | ||
2218 | /* trivial identity? */ | |
2219 | if (streq(tty, "console")) | |
2220 | return true; | |
2221 | ||
2222 | console = resolve_dev_console(&active); | |
2223 | /* if we could not resolve, assume it may */ | |
2224 | if (!console) | |
2225 | return true; | |
2226 | ||
2227 | /* "tty0" means the active VC, so it may be the same sometimes */ | |
e1d75803 | 2228 | return streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty)); |
6ac8fdc9 MS |
2229 | } |
2230 | ||
2231 | bool exec_context_may_touch_console(ExecContext *ec) { | |
2232 | return (ec->tty_reset || ec->tty_vhangup || ec->tty_vt_disallocate || | |
2233 | is_terminal_input(ec->std_input) || | |
2234 | is_terminal_output(ec->std_output) || | |
2235 | is_terminal_output(ec->std_error)) && | |
2236 | tty_may_match_dev_console(tty_path(ec)); | |
2237 | } | |
2238 | ||
15ae422b LP |
2239 | static void strv_fprintf(FILE *f, char **l) { |
2240 | char **g; | |
2241 | ||
2242 | assert(f); | |
2243 | ||
2244 | STRV_FOREACH(g, l) | |
2245 | fprintf(f, " %s", *g); | |
2246 | } | |
2247 | ||
5cb5a6ff | 2248 | void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { |
507f22bd | 2249 | char **e; |
94f04347 | 2250 | unsigned i; |
9eba9da4 | 2251 | |
5cb5a6ff LP |
2252 | assert(c); |
2253 | assert(f); | |
2254 | ||
4ad49000 | 2255 | prefix = strempty(prefix); |
5cb5a6ff LP |
2256 | |
2257 | fprintf(f, | |
94f04347 LP |
2258 | "%sUMask: %04o\n" |
2259 | "%sWorkingDirectory: %s\n" | |
451a074f | 2260 | "%sRootDirectory: %s\n" |
15ae422b | 2261 | "%sNonBlocking: %s\n" |
64747e2d | 2262 | "%sPrivateTmp: %s\n" |
4819ff03 | 2263 | "%sPrivateNetwork: %s\n" |
7f112f50 | 2264 | "%sPrivateDevices: %s\n" |
1b8689f9 LP |
2265 | "%sProtectHome: %s\n" |
2266 | "%sProtectSystem: %s\n" | |
3bb07b76 | 2267 | "%sIgnoreSIGPIPE: %s\n", |
5cb5a6ff | 2268 | prefix, c->umask, |
9eba9da4 | 2269 | prefix, c->working_directory ? c->working_directory : "/", |
451a074f | 2270 | prefix, c->root_directory ? c->root_directory : "/", |
15ae422b | 2271 | prefix, yes_no(c->non_blocking), |
64747e2d | 2272 | prefix, yes_no(c->private_tmp), |
4819ff03 | 2273 | prefix, yes_no(c->private_network), |
7f112f50 | 2274 | prefix, yes_no(c->private_devices), |
1b8689f9 LP |
2275 | prefix, protect_home_to_string(c->protect_home), |
2276 | prefix, protect_system_to_string(c->protect_system), | |
3bb07b76 | 2277 | prefix, yes_no(c->ignore_sigpipe)); |
fb33a393 | 2278 | |
8c7be95e LP |
2279 | STRV_FOREACH(e, c->environment) |
2280 | fprintf(f, "%sEnvironment: %s\n", prefix, *e); | |
2281 | ||
2282 | STRV_FOREACH(e, c->environment_files) | |
2283 | fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e); | |
94f04347 | 2284 | |
fb33a393 LP |
2285 | if (c->nice_set) |
2286 | fprintf(f, | |
2287 | "%sNice: %i\n", | |
2288 | prefix, c->nice); | |
2289 | ||
dd6c17b1 | 2290 | if (c->oom_score_adjust_set) |
fb33a393 | 2291 | fprintf(f, |
dd6c17b1 LP |
2292 | "%sOOMScoreAdjust: %i\n", |
2293 | prefix, c->oom_score_adjust); | |
9eba9da4 | 2294 | |
94f04347 LP |
2295 | for (i = 0; i < RLIM_NLIMITS; i++) |
2296 | if (c->rlimit[i]) | |
de0671ee ZJS |
2297 | fprintf(f, "%s%s: "RLIM_FMT"\n", |
2298 | prefix, rlimit_to_string(i), c->rlimit[i]->rlim_max); | |
94f04347 | 2299 | |
f8b69d1d | 2300 | if (c->ioprio_set) { |
1756a011 | 2301 | _cleanup_free_ char *class_str = NULL; |
f8b69d1d | 2302 | |
1756a011 | 2303 | ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str); |
9eba9da4 LP |
2304 | fprintf(f, |
2305 | "%sIOSchedulingClass: %s\n" | |
2306 | "%sIOPriority: %i\n", | |
f8b69d1d | 2307 | prefix, strna(class_str), |
9eba9da4 | 2308 | prefix, (int) IOPRIO_PRIO_DATA(c->ioprio)); |
f8b69d1d | 2309 | } |
94f04347 | 2310 | |
f8b69d1d | 2311 | if (c->cpu_sched_set) { |
1756a011 | 2312 | _cleanup_free_ char *policy_str = NULL; |
f8b69d1d | 2313 | |
1756a011 | 2314 | sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str); |
94f04347 LP |
2315 | fprintf(f, |
2316 | "%sCPUSchedulingPolicy: %s\n" | |
38b48754 LP |
2317 | "%sCPUSchedulingPriority: %i\n" |
2318 | "%sCPUSchedulingResetOnFork: %s\n", | |
f8b69d1d | 2319 | prefix, strna(policy_str), |
38b48754 LP |
2320 | prefix, c->cpu_sched_priority, |
2321 | prefix, yes_no(c->cpu_sched_reset_on_fork)); | |
b929bf04 | 2322 | } |
94f04347 | 2323 | |
82c121a4 | 2324 | if (c->cpuset) { |
94f04347 | 2325 | fprintf(f, "%sCPUAffinity:", prefix); |
82c121a4 LP |
2326 | for (i = 0; i < c->cpuset_ncpus; i++) |
2327 | if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset)) | |
43a99a7a | 2328 | fprintf(f, " %u", i); |
94f04347 LP |
2329 | fputs("\n", f); |
2330 | } | |
2331 | ||
3a43da28 | 2332 | if (c->timer_slack_nsec != NSEC_INFINITY) |
ccd06097 | 2333 | fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec); |
94f04347 LP |
2334 | |
2335 | fprintf(f, | |
80876c20 LP |
2336 | "%sStandardInput: %s\n" |
2337 | "%sStandardOutput: %s\n" | |
2338 | "%sStandardError: %s\n", | |
2339 | prefix, exec_input_to_string(c->std_input), | |
2340 | prefix, exec_output_to_string(c->std_output), | |
2341 | prefix, exec_output_to_string(c->std_error)); | |
2342 | ||
2343 | if (c->tty_path) | |
2344 | fprintf(f, | |
6ea832a2 LP |
2345 | "%sTTYPath: %s\n" |
2346 | "%sTTYReset: %s\n" | |
2347 | "%sTTYVHangup: %s\n" | |
2348 | "%sTTYVTDisallocate: %s\n", | |
2349 | prefix, c->tty_path, | |
2350 | prefix, yes_no(c->tty_reset), | |
2351 | prefix, yes_no(c->tty_vhangup), | |
2352 | prefix, yes_no(c->tty_vt_disallocate)); | |
94f04347 | 2353 | |
5ce70e5b ZJS |
2354 | if (c->std_output == EXEC_OUTPUT_SYSLOG || |
2355 | c->std_output == EXEC_OUTPUT_KMSG || | |
2356 | c->std_output == EXEC_OUTPUT_JOURNAL || | |
2357 | c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
2358 | c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
2359 | c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE || | |
2360 | c->std_error == EXEC_OUTPUT_SYSLOG || | |
2361 | c->std_error == EXEC_OUTPUT_KMSG || | |
2362 | c->std_error == EXEC_OUTPUT_JOURNAL || | |
2363 | c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
2364 | c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
2365 | c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) { | |
f8b69d1d | 2366 | |
5ce70e5b | 2367 | _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL; |
f8b69d1d | 2368 | |
5ce70e5b ZJS |
2369 | log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str); |
2370 | log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str); | |
f8b69d1d | 2371 | |
94f04347 LP |
2372 | fprintf(f, |
2373 | "%sSyslogFacility: %s\n" | |
2374 | "%sSyslogLevel: %s\n", | |
f8b69d1d MS |
2375 | prefix, strna(fac_str), |
2376 | prefix, strna(lvl_str)); | |
f8b69d1d | 2377 | } |
94f04347 LP |
2378 | |
2379 | if (c->capabilities) { | |
5ce70e5b ZJS |
2380 | _cleanup_cap_free_charp_ char *t; |
2381 | ||
2382 | t = cap_to_text(c->capabilities, NULL); | |
2383 | if (t) | |
2384 | fprintf(f, "%sCapabilities: %s\n", prefix, t); | |
94f04347 LP |
2385 | } |
2386 | ||
2387 | if (c->secure_bits) | |
2388 | fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n", | |
2389 | prefix, | |
cbb21cca ZJS |
2390 | (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "", |
2391 | (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "", | |
2392 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "", | |
2393 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "", | |
2394 | (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "", | |
2395 | (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : ""); | |
94f04347 LP |
2396 | |
2397 | if (c->capability_bounding_set_drop) { | |
ae556c21 | 2398 | unsigned long l; |
260abb78 | 2399 | fprintf(f, "%sCapabilityBoundingSet:", prefix); |
94f04347 | 2400 | |
64685e0c | 2401 | for (l = 0; l <= cap_last_cap(); l++) |
2822da4f LP |
2402 | if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) |
2403 | fprintf(f, " %s", strna(capability_to_name(l))); | |
94f04347 LP |
2404 | |
2405 | fputs("\n", f); | |
2406 | } | |
2407 | ||
2408 | if (c->user) | |
f2d3769a | 2409 | fprintf(f, "%sUser: %s\n", prefix, c->user); |
94f04347 | 2410 | if (c->group) |
f2d3769a | 2411 | fprintf(f, "%sGroup: %s\n", prefix, c->group); |
94f04347 | 2412 | |
15ae422b | 2413 | if (strv_length(c->supplementary_groups) > 0) { |
94f04347 | 2414 | fprintf(f, "%sSupplementaryGroups:", prefix); |
15ae422b LP |
2415 | strv_fprintf(f, c->supplementary_groups); |
2416 | fputs("\n", f); | |
2417 | } | |
94f04347 | 2418 | |
5b6319dc | 2419 | if (c->pam_name) |
f2d3769a | 2420 | fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name); |
5b6319dc | 2421 | |
15ae422b LP |
2422 | if (strv_length(c->read_write_dirs) > 0) { |
2423 | fprintf(f, "%sReadWriteDirs:", prefix); | |
2424 | strv_fprintf(f, c->read_write_dirs); | |
2425 | fputs("\n", f); | |
2426 | } | |
2427 | ||
2428 | if (strv_length(c->read_only_dirs) > 0) { | |
2429 | fprintf(f, "%sReadOnlyDirs:", prefix); | |
2430 | strv_fprintf(f, c->read_only_dirs); | |
2431 | fputs("\n", f); | |
2432 | } | |
94f04347 | 2433 | |
15ae422b LP |
2434 | if (strv_length(c->inaccessible_dirs) > 0) { |
2435 | fprintf(f, "%sInaccessibleDirs:", prefix); | |
2436 | strv_fprintf(f, c->inaccessible_dirs); | |
94f04347 LP |
2437 | fputs("\n", f); |
2438 | } | |
2e22afe9 | 2439 | |
169c1bda LP |
2440 | if (c->utmp_id) |
2441 | fprintf(f, | |
2442 | "%sUtmpIdentifier: %s\n", | |
2443 | prefix, c->utmp_id); | |
7b52a628 MS |
2444 | |
2445 | if (c->selinux_context) | |
2446 | fprintf(f, | |
5f8640fb LP |
2447 | "%sSELinuxContext: %s%s\n", |
2448 | prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context); | |
17df7223 | 2449 | |
050f7277 | 2450 | if (c->personality != PERSONALITY_INVALID) |
ac45f971 LP |
2451 | fprintf(f, |
2452 | "%sPersonality: %s\n", | |
2453 | prefix, strna(personality_to_string(c->personality))); | |
2454 | ||
17df7223 | 2455 | if (c->syscall_filter) { |
351a19b1 | 2456 | #ifdef HAVE_SECCOMP |
17df7223 LP |
2457 | Iterator j; |
2458 | void *id; | |
2459 | bool first = true; | |
351a19b1 | 2460 | #endif |
17df7223 LP |
2461 | |
2462 | fprintf(f, | |
57183d11 | 2463 | "%sSystemCallFilter: ", |
17df7223 LP |
2464 | prefix); |
2465 | ||
2466 | if (!c->syscall_whitelist) | |
2467 | fputc('~', f); | |
2468 | ||
351a19b1 | 2469 | #ifdef HAVE_SECCOMP |
17df7223 LP |
2470 | SET_FOREACH(id, c->syscall_filter, j) { |
2471 | _cleanup_free_ char *name = NULL; | |
2472 | ||
2473 | if (first) | |
2474 | first = false; | |
2475 | else | |
2476 | fputc(' ', f); | |
2477 | ||
57183d11 | 2478 | name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1); |
17df7223 LP |
2479 | fputs(strna(name), f); |
2480 | } | |
351a19b1 | 2481 | #endif |
17df7223 LP |
2482 | |
2483 | fputc('\n', f); | |
2484 | } | |
2485 | ||
57183d11 LP |
2486 | if (c->syscall_archs) { |
2487 | #ifdef HAVE_SECCOMP | |
2488 | Iterator j; | |
2489 | void *id; | |
2490 | #endif | |
2491 | ||
2492 | fprintf(f, | |
2493 | "%sSystemCallArchitectures:", | |
2494 | prefix); | |
2495 | ||
2496 | #ifdef HAVE_SECCOMP | |
2497 | SET_FOREACH(id, c->syscall_archs, j) | |
2498 | fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1))); | |
2499 | #endif | |
2500 | fputc('\n', f); | |
2501 | } | |
2502 | ||
17df7223 LP |
2503 | if (c->syscall_errno != 0) |
2504 | fprintf(f, | |
2505 | "%sSystemCallErrorNumber: %s\n", | |
2506 | prefix, strna(errno_to_name(c->syscall_errno))); | |
eef65bf3 MS |
2507 | |
2508 | if (c->apparmor_profile) | |
2509 | fprintf(f, | |
2510 | "%sAppArmorProfile: %s%s\n", | |
2511 | prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile); | |
5cb5a6ff LP |
2512 | } |
2513 | ||
a931ad47 LP |
2514 | bool exec_context_maintains_privileges(ExecContext *c) { |
2515 | assert(c); | |
2516 | ||
2517 | /* Returns true if the process forked off would run run under | |
2518 | * an unchanged UID or as root. */ | |
2519 | ||
2520 | if (!c->user) | |
2521 | return true; | |
2522 | ||
2523 | if (streq(c->user, "root") || streq(c->user, "0")) | |
2524 | return true; | |
2525 | ||
2526 | return false; | |
2527 | } | |
2528 | ||
b58b4116 | 2529 | void exec_status_start(ExecStatus *s, pid_t pid) { |
034c6ed7 | 2530 | assert(s); |
5cb5a6ff | 2531 | |
b58b4116 LP |
2532 | zero(*s); |
2533 | s->pid = pid; | |
2534 | dual_timestamp_get(&s->start_timestamp); | |
2535 | } | |
2536 | ||
6ea832a2 | 2537 | void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) { |
b58b4116 LP |
2538 | assert(s); |
2539 | ||
0b1f4ae6 | 2540 | if (s->pid && s->pid != pid) |
b58b4116 LP |
2541 | zero(*s); |
2542 | ||
034c6ed7 | 2543 | s->pid = pid; |
63983207 | 2544 | dual_timestamp_get(&s->exit_timestamp); |
9fb86720 | 2545 | |
034c6ed7 LP |
2546 | s->code = code; |
2547 | s->status = status; | |
169c1bda | 2548 | |
6ea832a2 LP |
2549 | if (context) { |
2550 | if (context->utmp_id) | |
2551 | utmp_put_dead_process(context->utmp_id, pid, code, status); | |
2552 | ||
2553 | exec_context_tty_reset(context); | |
2554 | } | |
9fb86720 LP |
2555 | } |
2556 | ||
2557 | void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) { | |
2558 | char buf[FORMAT_TIMESTAMP_MAX]; | |
2559 | ||
2560 | assert(s); | |
2561 | assert(f); | |
2562 | ||
9fb86720 LP |
2563 | if (s->pid <= 0) |
2564 | return; | |
2565 | ||
4c940960 LP |
2566 | prefix = strempty(prefix); |
2567 | ||
9fb86720 | 2568 | fprintf(f, |
ccd06097 ZJS |
2569 | "%sPID: "PID_FMT"\n", |
2570 | prefix, s->pid); | |
9fb86720 | 2571 | |
63983207 | 2572 | if (s->start_timestamp.realtime > 0) |
9fb86720 LP |
2573 | fprintf(f, |
2574 | "%sStart Timestamp: %s\n", | |
63983207 | 2575 | prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime)); |
9fb86720 | 2576 | |
63983207 | 2577 | if (s->exit_timestamp.realtime > 0) |
9fb86720 LP |
2578 | fprintf(f, |
2579 | "%sExit Timestamp: %s\n" | |
2580 | "%sExit Code: %s\n" | |
2581 | "%sExit Status: %i\n", | |
63983207 | 2582 | prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime), |
9fb86720 LP |
2583 | prefix, sigchld_code_to_string(s->code), |
2584 | prefix, s->status); | |
5cb5a6ff | 2585 | } |
44d8db9e | 2586 | |
9e2f7c11 | 2587 | char *exec_command_line(char **argv) { |
44d8db9e LP |
2588 | size_t k; |
2589 | char *n, *p, **a; | |
2590 | bool first = true; | |
2591 | ||
9e2f7c11 | 2592 | assert(argv); |
44d8db9e | 2593 | |
9164977d | 2594 | k = 1; |
9e2f7c11 | 2595 | STRV_FOREACH(a, argv) |
44d8db9e LP |
2596 | k += strlen(*a)+3; |
2597 | ||
2598 | if (!(n = new(char, k))) | |
2599 | return NULL; | |
2600 | ||
2601 | p = n; | |
9e2f7c11 | 2602 | STRV_FOREACH(a, argv) { |
44d8db9e LP |
2603 | |
2604 | if (!first) | |
2605 | *(p++) = ' '; | |
2606 | else | |
2607 | first = false; | |
2608 | ||
2609 | if (strpbrk(*a, WHITESPACE)) { | |
2610 | *(p++) = '\''; | |
2611 | p = stpcpy(p, *a); | |
2612 | *(p++) = '\''; | |
2613 | } else | |
2614 | p = stpcpy(p, *a); | |
2615 | ||
2616 | } | |
2617 | ||
9164977d LP |
2618 | *p = 0; |
2619 | ||
44d8db9e LP |
2620 | /* FIXME: this doesn't really handle arguments that have |
2621 | * spaces and ticks in them */ | |
2622 | ||
2623 | return n; | |
2624 | } | |
2625 | ||
2626 | void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) { | |
e1d75803 | 2627 | _cleanup_free_ char *cmd = NULL; |
4c940960 | 2628 | const char *prefix2; |
44d8db9e LP |
2629 | |
2630 | assert(c); | |
2631 | assert(f); | |
2632 | ||
4c940960 | 2633 | prefix = strempty(prefix); |
63c372cb | 2634 | prefix2 = strjoina(prefix, "\t"); |
44d8db9e | 2635 | |
9e2f7c11 | 2636 | cmd = exec_command_line(c->argv); |
44d8db9e LP |
2637 | fprintf(f, |
2638 | "%sCommand Line: %s\n", | |
2639 | prefix, cmd ? cmd : strerror(ENOMEM)); | |
2640 | ||
9fb86720 | 2641 | exec_status_dump(&c->exec_status, f, prefix2); |
44d8db9e LP |
2642 | } |
2643 | ||
2644 | void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) { | |
2645 | assert(f); | |
2646 | ||
4c940960 | 2647 | prefix = strempty(prefix); |
44d8db9e LP |
2648 | |
2649 | LIST_FOREACH(command, c, c) | |
2650 | exec_command_dump(c, f, prefix); | |
2651 | } | |
94f04347 | 2652 | |
a6a80b4f LP |
2653 | void exec_command_append_list(ExecCommand **l, ExecCommand *e) { |
2654 | ExecCommand *end; | |
2655 | ||
2656 | assert(l); | |
2657 | assert(e); | |
2658 | ||
2659 | if (*l) { | |
35b8ca3a | 2660 | /* It's kind of important, that we keep the order here */ |
71fda00f LP |
2661 | LIST_FIND_TAIL(command, *l, end); |
2662 | LIST_INSERT_AFTER(command, *l, end, e); | |
a6a80b4f LP |
2663 | } else |
2664 | *l = e; | |
2665 | } | |
2666 | ||
26fd040d LP |
2667 | int exec_command_set(ExecCommand *c, const char *path, ...) { |
2668 | va_list ap; | |
2669 | char **l, *p; | |
2670 | ||
2671 | assert(c); | |
2672 | assert(path); | |
2673 | ||
2674 | va_start(ap, path); | |
2675 | l = strv_new_ap(path, ap); | |
2676 | va_end(ap); | |
2677 | ||
2678 | if (!l) | |
2679 | return -ENOMEM; | |
2680 | ||
250a918d LP |
2681 | p = strdup(path); |
2682 | if (!p) { | |
26fd040d LP |
2683 | strv_free(l); |
2684 | return -ENOMEM; | |
2685 | } | |
2686 | ||
2687 | free(c->path); | |
2688 | c->path = p; | |
2689 | ||
2690 | strv_free(c->argv); | |
2691 | c->argv = l; | |
2692 | ||
2693 | return 0; | |
2694 | } | |
2695 | ||
86b23b07 | 2696 | int exec_command_append(ExecCommand *c, const char *path, ...) { |
e63ff941 | 2697 | _cleanup_strv_free_ char **l = NULL; |
86b23b07 | 2698 | va_list ap; |
86b23b07 JS |
2699 | int r; |
2700 | ||
2701 | assert(c); | |
2702 | assert(path); | |
2703 | ||
2704 | va_start(ap, path); | |
2705 | l = strv_new_ap(path, ap); | |
2706 | va_end(ap); | |
2707 | ||
2708 | if (!l) | |
2709 | return -ENOMEM; | |
2710 | ||
2711 | r = strv_extend_strv(&c->argv, l); | |
e63ff941 | 2712 | if (r < 0) |
86b23b07 | 2713 | return r; |
86b23b07 JS |
2714 | |
2715 | return 0; | |
2716 | } | |
2717 | ||
2718 | ||
613b411c LP |
2719 | static int exec_runtime_allocate(ExecRuntime **rt) { |
2720 | ||
2721 | if (*rt) | |
2722 | return 0; | |
2723 | ||
2724 | *rt = new0(ExecRuntime, 1); | |
f146f5e1 | 2725 | if (!*rt) |
613b411c LP |
2726 | return -ENOMEM; |
2727 | ||
2728 | (*rt)->n_ref = 1; | |
2729 | (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1; | |
2730 | ||
2731 | return 0; | |
2732 | } | |
2733 | ||
2734 | int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) { | |
2735 | int r; | |
2736 | ||
2737 | assert(rt); | |
2738 | assert(c); | |
2739 | assert(id); | |
2740 | ||
2741 | if (*rt) | |
2742 | return 1; | |
2743 | ||
2744 | if (!c->private_network && !c->private_tmp) | |
2745 | return 0; | |
2746 | ||
2747 | r = exec_runtime_allocate(rt); | |
2748 | if (r < 0) | |
2749 | return r; | |
2750 | ||
2751 | if (c->private_network && (*rt)->netns_storage_socket[0] < 0) { | |
2752 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, (*rt)->netns_storage_socket) < 0) | |
2753 | return -errno; | |
2754 | } | |
2755 | ||
2756 | if (c->private_tmp && !(*rt)->tmp_dir) { | |
2757 | r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir); | |
2758 | if (r < 0) | |
2759 | return r; | |
2760 | } | |
2761 | ||
2762 | return 1; | |
2763 | } | |
2764 | ||
2765 | ExecRuntime *exec_runtime_ref(ExecRuntime *r) { | |
2766 | assert(r); | |
2767 | assert(r->n_ref > 0); | |
2768 | ||
2769 | r->n_ref++; | |
2770 | return r; | |
2771 | } | |
2772 | ||
2773 | ExecRuntime *exec_runtime_unref(ExecRuntime *r) { | |
2774 | ||
2775 | if (!r) | |
2776 | return NULL; | |
2777 | ||
2778 | assert(r->n_ref > 0); | |
2779 | ||
2780 | r->n_ref--; | |
f2341e0a LP |
2781 | if (r->n_ref > 0) |
2782 | return NULL; | |
2783 | ||
2784 | free(r->tmp_dir); | |
2785 | free(r->var_tmp_dir); | |
2786 | safe_close_pair(r->netns_storage_socket); | |
2787 | free(r); | |
613b411c LP |
2788 | |
2789 | return NULL; | |
2790 | } | |
2791 | ||
f2341e0a | 2792 | int exec_runtime_serialize(Unit *u, ExecRuntime *rt, FILE *f, FDSet *fds) { |
613b411c LP |
2793 | assert(u); |
2794 | assert(f); | |
2795 | assert(fds); | |
2796 | ||
2797 | if (!rt) | |
2798 | return 0; | |
2799 | ||
2800 | if (rt->tmp_dir) | |
2801 | unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir); | |
2802 | ||
2803 | if (rt->var_tmp_dir) | |
2804 | unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir); | |
2805 | ||
2806 | if (rt->netns_storage_socket[0] >= 0) { | |
2807 | int copy; | |
2808 | ||
2809 | copy = fdset_put_dup(fds, rt->netns_storage_socket[0]); | |
2810 | if (copy < 0) | |
2811 | return copy; | |
2812 | ||
2813 | unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy); | |
2814 | } | |
2815 | ||
2816 | if (rt->netns_storage_socket[1] >= 0) { | |
2817 | int copy; | |
2818 | ||
2819 | copy = fdset_put_dup(fds, rt->netns_storage_socket[1]); | |
2820 | if (copy < 0) | |
2821 | return copy; | |
2822 | ||
2823 | unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy); | |
2824 | } | |
2825 | ||
2826 | return 0; | |
2827 | } | |
2828 | ||
f2341e0a | 2829 | int exec_runtime_deserialize_item(Unit *u, ExecRuntime **rt, const char *key, const char *value, FDSet *fds) { |
613b411c LP |
2830 | int r; |
2831 | ||
2832 | assert(rt); | |
2833 | assert(key); | |
2834 | assert(value); | |
2835 | ||
2836 | if (streq(key, "tmp-dir")) { | |
2837 | char *copy; | |
2838 | ||
2839 | r = exec_runtime_allocate(rt); | |
2840 | if (r < 0) | |
f2341e0a | 2841 | return log_oom(); |
613b411c LP |
2842 | |
2843 | copy = strdup(value); | |
2844 | if (!copy) | |
2845 | return log_oom(); | |
2846 | ||
2847 | free((*rt)->tmp_dir); | |
2848 | (*rt)->tmp_dir = copy; | |
2849 | ||
2850 | } else if (streq(key, "var-tmp-dir")) { | |
2851 | char *copy; | |
2852 | ||
2853 | r = exec_runtime_allocate(rt); | |
2854 | if (r < 0) | |
f2341e0a | 2855 | return log_oom(); |
613b411c LP |
2856 | |
2857 | copy = strdup(value); | |
2858 | if (!copy) | |
2859 | return log_oom(); | |
2860 | ||
2861 | free((*rt)->var_tmp_dir); | |
2862 | (*rt)->var_tmp_dir = copy; | |
2863 | ||
2864 | } else if (streq(key, "netns-socket-0")) { | |
2865 | int fd; | |
2866 | ||
2867 | r = exec_runtime_allocate(rt); | |
2868 | if (r < 0) | |
f2341e0a | 2869 | return log_oom(); |
613b411c LP |
2870 | |
2871 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 2872 | log_unit_debug(u, "Failed to parse netns socket value: %s", value); |
613b411c | 2873 | else { |
03e334a1 | 2874 | safe_close((*rt)->netns_storage_socket[0]); |
613b411c LP |
2875 | (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd); |
2876 | } | |
2877 | } else if (streq(key, "netns-socket-1")) { | |
2878 | int fd; | |
2879 | ||
2880 | r = exec_runtime_allocate(rt); | |
2881 | if (r < 0) | |
f2341e0a | 2882 | return log_oom(); |
613b411c LP |
2883 | |
2884 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 2885 | log_unit_debug(u, "Failed to parse netns socket value: %s", value); |
613b411c | 2886 | else { |
03e334a1 | 2887 | safe_close((*rt)->netns_storage_socket[1]); |
613b411c LP |
2888 | (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd); |
2889 | } | |
2890 | } else | |
2891 | return 0; | |
2892 | ||
2893 | return 1; | |
2894 | } | |
2895 | ||
2896 | static void *remove_tmpdir_thread(void *p) { | |
2897 | _cleanup_free_ char *path = p; | |
2898 | ||
c6878637 | 2899 | (void) rm_rf(path, REMOVE_ROOT|REMOVE_PHYSICAL); |
613b411c LP |
2900 | return NULL; |
2901 | } | |
2902 | ||
2903 | void exec_runtime_destroy(ExecRuntime *rt) { | |
98b47d54 LP |
2904 | int r; |
2905 | ||
613b411c LP |
2906 | if (!rt) |
2907 | return; | |
2908 | ||
2909 | /* If there are multiple users of this, let's leave the stuff around */ | |
2910 | if (rt->n_ref > 1) | |
2911 | return; | |
2912 | ||
2913 | if (rt->tmp_dir) { | |
2914 | log_debug("Spawning thread to nuke %s", rt->tmp_dir); | |
98b47d54 LP |
2915 | |
2916 | r = asynchronous_job(remove_tmpdir_thread, rt->tmp_dir); | |
2917 | if (r < 0) { | |
da927ba9 | 2918 | log_warning_errno(r, "Failed to nuke %s: %m", rt->tmp_dir); |
98b47d54 LP |
2919 | free(rt->tmp_dir); |
2920 | } | |
2921 | ||
613b411c LP |
2922 | rt->tmp_dir = NULL; |
2923 | } | |
2924 | ||
2925 | if (rt->var_tmp_dir) { | |
2926 | log_debug("Spawning thread to nuke %s", rt->var_tmp_dir); | |
98b47d54 LP |
2927 | |
2928 | r = asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir); | |
2929 | if (r < 0) { | |
da927ba9 | 2930 | log_warning_errno(r, "Failed to nuke %s: %m", rt->var_tmp_dir); |
98b47d54 LP |
2931 | free(rt->var_tmp_dir); |
2932 | } | |
2933 | ||
613b411c LP |
2934 | rt->var_tmp_dir = NULL; |
2935 | } | |
2936 | ||
3d94f76c | 2937 | safe_close_pair(rt->netns_storage_socket); |
613b411c LP |
2938 | } |
2939 | ||
80876c20 LP |
2940 | static const char* const exec_input_table[_EXEC_INPUT_MAX] = { |
2941 | [EXEC_INPUT_NULL] = "null", | |
2942 | [EXEC_INPUT_TTY] = "tty", | |
2943 | [EXEC_INPUT_TTY_FORCE] = "tty-force", | |
4f2d528d LP |
2944 | [EXEC_INPUT_TTY_FAIL] = "tty-fail", |
2945 | [EXEC_INPUT_SOCKET] = "socket" | |
80876c20 LP |
2946 | }; |
2947 | ||
8a0867d6 LP |
2948 | DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput); |
2949 | ||
94f04347 | 2950 | static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = { |
80876c20 | 2951 | [EXEC_OUTPUT_INHERIT] = "inherit", |
94f04347 | 2952 | [EXEC_OUTPUT_NULL] = "null", |
80876c20 | 2953 | [EXEC_OUTPUT_TTY] = "tty", |
94f04347 | 2954 | [EXEC_OUTPUT_SYSLOG] = "syslog", |
28dbc1e8 | 2955 | [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console", |
9a6bca7a | 2956 | [EXEC_OUTPUT_KMSG] = "kmsg", |
28dbc1e8 | 2957 | [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console", |
706343f4 LP |
2958 | [EXEC_OUTPUT_JOURNAL] = "journal", |
2959 | [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console", | |
4f2d528d | 2960 | [EXEC_OUTPUT_SOCKET] = "socket" |
94f04347 LP |
2961 | }; |
2962 | ||
2963 | DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput); | |
023a4f67 LP |
2964 | |
2965 | static const char* const exec_utmp_mode_table[_EXEC_UTMP_MODE_MAX] = { | |
2966 | [EXEC_UTMP_INIT] = "init", | |
2967 | [EXEC_UTMP_LOGIN] = "login", | |
2968 | [EXEC_UTMP_USER] = "user", | |
2969 | }; | |
2970 | ||
2971 | DEFINE_STRING_TABLE_LOOKUP(exec_utmp_mode, ExecUtmpMode); |