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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> |
ac45f971 | 34 | #include <sys/personality.h> |
5cb5a6ff | 35 | |
5b6319dc LP |
36 | #ifdef HAVE_PAM |
37 | #include <security/pam_appl.h> | |
38 | #endif | |
39 | ||
7b52a628 MS |
40 | #ifdef HAVE_SELINUX |
41 | #include <selinux/selinux.h> | |
42 | #endif | |
43 | ||
17df7223 LP |
44 | #ifdef HAVE_SECCOMP |
45 | #include <seccomp.h> | |
46 | #endif | |
47 | ||
eef65bf3 MS |
48 | #ifdef HAVE_APPARMOR |
49 | #include <sys/apparmor.h> | |
50 | #endif | |
51 | ||
c6878637 | 52 | #include "rm-rf.h" |
5cb5a6ff LP |
53 | #include "execute.h" |
54 | #include "strv.h" | |
55 | #include "macro.h" | |
d7832d2c | 56 | #include "capability.h" |
5cb5a6ff | 57 | #include "util.h" |
acbb0225 | 58 | #include "log.h" |
20ad4cfd | 59 | #include "sd-messages.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" |
5cb5a6ff | 82 | |
2eec67ac TA |
83 | #ifdef HAVE_APPARMOR |
84 | #include "apparmor-util.h" | |
85 | #endif | |
86 | ||
57183d11 LP |
87 | #ifdef HAVE_SECCOMP |
88 | #include "seccomp-util.h" | |
89 | #endif | |
90 | ||
e056b01d | 91 | #define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC) |
31a7eb86 | 92 | #define IDLE_TIMEOUT2_USEC (1*USEC_PER_SEC) |
e6a26745 | 93 | |
02a51aba LP |
94 | /* This assumes there is a 'tty' group */ |
95 | #define TTY_MODE 0620 | |
96 | ||
531dca78 LP |
97 | #define SNDBUF_SIZE (8*1024*1024) |
98 | ||
034c6ed7 LP |
99 | static int shift_fds(int fds[], unsigned n_fds) { |
100 | int start, restart_from; | |
101 | ||
102 | if (n_fds <= 0) | |
103 | return 0; | |
104 | ||
a0d40ac5 LP |
105 | /* Modifies the fds array! (sorts it) */ |
106 | ||
034c6ed7 LP |
107 | assert(fds); |
108 | ||
109 | start = 0; | |
110 | for (;;) { | |
111 | int i; | |
112 | ||
113 | restart_from = -1; | |
114 | ||
115 | for (i = start; i < (int) n_fds; i++) { | |
116 | int nfd; | |
117 | ||
118 | /* Already at right index? */ | |
119 | if (fds[i] == i+3) | |
120 | continue; | |
121 | ||
122 | if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0) | |
123 | return -errno; | |
124 | ||
03e334a1 | 125 | safe_close(fds[i]); |
034c6ed7 LP |
126 | fds[i] = nfd; |
127 | ||
128 | /* Hmm, the fd we wanted isn't free? Then | |
ee33e53a | 129 | * let's remember that and try again from here */ |
034c6ed7 LP |
130 | if (nfd != i+3 && restart_from < 0) |
131 | restart_from = i; | |
132 | } | |
133 | ||
134 | if (restart_from < 0) | |
135 | break; | |
136 | ||
137 | start = restart_from; | |
138 | } | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
c2748801 | 143 | static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) { |
47a71eed | 144 | unsigned i; |
e2c76839 | 145 | int r; |
47a71eed LP |
146 | |
147 | if (n_fds <= 0) | |
148 | return 0; | |
149 | ||
150 | assert(fds); | |
151 | ||
451a074f | 152 | /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */ |
47a71eed LP |
153 | |
154 | for (i = 0; i < n_fds; i++) { | |
47a71eed | 155 | |
e2c76839 LP |
156 | if ((r = fd_nonblock(fds[i], nonblock)) < 0) |
157 | return r; | |
47a71eed | 158 | |
451a074f LP |
159 | /* We unconditionally drop FD_CLOEXEC from the fds, |
160 | * since after all we want to pass these fds to our | |
161 | * children */ | |
47a71eed | 162 | |
e2c76839 LP |
163 | if ((r = fd_cloexec(fds[i], false)) < 0) |
164 | return r; | |
47a71eed LP |
165 | } |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
44a6b1b6 | 170 | _pure_ static const char *tty_path(const ExecContext *context) { |
80876c20 LP |
171 | assert(context); |
172 | ||
173 | if (context->tty_path) | |
174 | return context->tty_path; | |
175 | ||
176 | return "/dev/console"; | |
177 | } | |
178 | ||
9588bc32 | 179 | static void exec_context_tty_reset(const ExecContext *context) { |
6ea832a2 LP |
180 | assert(context); |
181 | ||
182 | if (context->tty_vhangup) | |
183 | terminal_vhangup(tty_path(context)); | |
184 | ||
185 | if (context->tty_reset) | |
186 | reset_terminal(tty_path(context)); | |
187 | ||
188 | if (context->tty_vt_disallocate && context->tty_path) | |
189 | vt_disallocate(context->tty_path); | |
190 | } | |
191 | ||
3a1286b6 MS |
192 | static bool is_terminal_output(ExecOutput o) { |
193 | return | |
194 | o == EXEC_OUTPUT_TTY || | |
195 | o == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
196 | o == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
197 | o == EXEC_OUTPUT_JOURNAL_AND_CONSOLE; | |
198 | } | |
199 | ||
80876c20 LP |
200 | static int open_null_as(int flags, int nfd) { |
201 | int fd, r; | |
071830ff | 202 | |
80876c20 | 203 | assert(nfd >= 0); |
071830ff | 204 | |
613b411c LP |
205 | fd = open("/dev/null", flags|O_NOCTTY); |
206 | if (fd < 0) | |
071830ff LP |
207 | return -errno; |
208 | ||
80876c20 LP |
209 | if (fd != nfd) { |
210 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 211 | safe_close(fd); |
80876c20 LP |
212 | } else |
213 | r = nfd; | |
071830ff | 214 | |
80876c20 | 215 | return r; |
071830ff LP |
216 | } |
217 | ||
524daa8c | 218 | static int connect_journal_socket(int fd, uid_t uid, gid_t gid) { |
b92bea5d ZJS |
219 | union sockaddr_union sa = { |
220 | .un.sun_family = AF_UNIX, | |
221 | .un.sun_path = "/run/systemd/journal/stdout", | |
222 | }; | |
524daa8c ZJS |
223 | uid_t olduid = UID_INVALID; |
224 | gid_t oldgid = GID_INVALID; | |
225 | int r; | |
226 | ||
227 | if (gid != GID_INVALID) { | |
228 | oldgid = getgid(); | |
229 | ||
230 | r = setegid(gid); | |
231 | if (r < 0) | |
232 | return -errno; | |
233 | } | |
234 | ||
235 | if (uid != UID_INVALID) { | |
236 | olduid = getuid(); | |
237 | ||
238 | r = seteuid(uid); | |
239 | if (r < 0) { | |
240 | r = -errno; | |
241 | goto restore_gid; | |
242 | } | |
243 | } | |
244 | ||
245 | r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)); | |
246 | if (r < 0) | |
247 | r = -errno; | |
248 | ||
249 | /* If we fail to restore the uid or gid, things will likely | |
250 | fail later on. This should only happen if an LSM interferes. */ | |
251 | ||
252 | if (uid != UID_INVALID) | |
253 | (void) seteuid(olduid); | |
254 | ||
255 | restore_gid: | |
256 | if (gid != GID_INVALID) | |
257 | (void) setegid(oldgid); | |
258 | ||
259 | return r; | |
260 | } | |
261 | ||
262 | 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) { | |
263 | int fd, r; | |
071830ff LP |
264 | |
265 | assert(context); | |
80876c20 LP |
266 | assert(output < _EXEC_OUTPUT_MAX); |
267 | assert(ident); | |
268 | assert(nfd >= 0); | |
071830ff | 269 | |
54fe0cdb LP |
270 | fd = socket(AF_UNIX, SOCK_STREAM, 0); |
271 | if (fd < 0) | |
80876c20 | 272 | return -errno; |
071830ff | 273 | |
524daa8c ZJS |
274 | r = connect_journal_socket(fd, uid, gid); |
275 | if (r < 0) | |
276 | return r; | |
071830ff | 277 | |
80876c20 | 278 | if (shutdown(fd, SHUT_RD) < 0) { |
03e334a1 | 279 | safe_close(fd); |
80876c20 LP |
280 | return -errno; |
281 | } | |
071830ff | 282 | |
531dca78 LP |
283 | fd_inc_sndbuf(fd, SNDBUF_SIZE); |
284 | ||
80876c20 | 285 | dprintf(fd, |
62bca2c6 | 286 | "%s\n" |
80876c20 LP |
287 | "%s\n" |
288 | "%i\n" | |
54fe0cdb LP |
289 | "%i\n" |
290 | "%i\n" | |
291 | "%i\n" | |
4f4a1dbf | 292 | "%i\n", |
4f4a1dbf | 293 | context->syslog_identifier ? context->syslog_identifier : ident, |
62bca2c6 | 294 | unit_id, |
54fe0cdb LP |
295 | context->syslog_priority, |
296 | !!context->syslog_level_prefix, | |
297 | output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE, | |
298 | output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE, | |
3a1286b6 | 299 | is_terminal_output(output)); |
80876c20 LP |
300 | |
301 | if (fd != nfd) { | |
302 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 303 | safe_close(fd); |
80876c20 LP |
304 | } else |
305 | r = nfd; | |
071830ff | 306 | |
80876c20 LP |
307 | return r; |
308 | } | |
309 | static int open_terminal_as(const char *path, mode_t mode, int nfd) { | |
310 | int fd, r; | |
071830ff | 311 | |
80876c20 LP |
312 | assert(path); |
313 | assert(nfd >= 0); | |
071830ff | 314 | |
80876c20 LP |
315 | if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0) |
316 | return fd; | |
071830ff | 317 | |
80876c20 LP |
318 | if (fd != nfd) { |
319 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 320 | safe_close(fd); |
80876c20 LP |
321 | } else |
322 | r = nfd; | |
071830ff | 323 | |
80876c20 LP |
324 | return r; |
325 | } | |
071830ff | 326 | |
80876c20 LP |
327 | static bool is_terminal_input(ExecInput i) { |
328 | return | |
329 | i == EXEC_INPUT_TTY || | |
330 | i == EXEC_INPUT_TTY_FORCE || | |
331 | i == EXEC_INPUT_TTY_FAIL; | |
332 | } | |
071830ff | 333 | |
1e3ad081 LP |
334 | static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) { |
335 | ||
336 | if (is_terminal_input(std_input) && !apply_tty_stdin) | |
337 | return EXEC_INPUT_NULL; | |
071830ff | 338 | |
03fd9c49 | 339 | if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0) |
4f2d528d LP |
340 | return EXEC_INPUT_NULL; |
341 | ||
03fd9c49 | 342 | return std_input; |
4f2d528d LP |
343 | } |
344 | ||
03fd9c49 | 345 | static int fixup_output(ExecOutput std_output, int socket_fd) { |
4f2d528d | 346 | |
03fd9c49 | 347 | if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0) |
4f2d528d LP |
348 | return EXEC_OUTPUT_INHERIT; |
349 | ||
03fd9c49 | 350 | return std_output; |
4f2d528d LP |
351 | } |
352 | ||
1e3ad081 | 353 | static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) { |
4f2d528d LP |
354 | ExecInput i; |
355 | ||
356 | assert(context); | |
357 | ||
1e3ad081 | 358 | i = fixup_input(context->std_input, socket_fd, apply_tty_stdin); |
4f2d528d LP |
359 | |
360 | switch (i) { | |
071830ff | 361 | |
80876c20 LP |
362 | case EXEC_INPUT_NULL: |
363 | return open_null_as(O_RDONLY, STDIN_FILENO); | |
364 | ||
365 | case EXEC_INPUT_TTY: | |
366 | case EXEC_INPUT_TTY_FORCE: | |
367 | case EXEC_INPUT_TTY_FAIL: { | |
368 | int fd, r; | |
071830ff | 369 | |
970edce6 ZJS |
370 | fd = acquire_terminal(tty_path(context), |
371 | i == EXEC_INPUT_TTY_FAIL, | |
372 | i == EXEC_INPUT_TTY_FORCE, | |
373 | false, | |
3a43da28 | 374 | USEC_INFINITY); |
970edce6 | 375 | if (fd < 0) |
80876c20 LP |
376 | return fd; |
377 | ||
378 | if (fd != STDIN_FILENO) { | |
379 | r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
03e334a1 | 380 | safe_close(fd); |
80876c20 LP |
381 | } else |
382 | r = STDIN_FILENO; | |
383 | ||
384 | return r; | |
385 | } | |
386 | ||
4f2d528d LP |
387 | case EXEC_INPUT_SOCKET: |
388 | return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
389 | ||
80876c20 LP |
390 | default: |
391 | assert_not_reached("Unknown input type"); | |
392 | } | |
393 | } | |
394 | ||
f2341e0a | 395 | 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 |
396 | ExecOutput o; |
397 | ExecInput i; | |
47c1d80d | 398 | int r; |
4f2d528d | 399 | |
f2341e0a | 400 | assert(unit); |
80876c20 LP |
401 | assert(context); |
402 | assert(ident); | |
403 | ||
1e3ad081 | 404 | i = fixup_input(context->std_input, socket_fd, apply_tty_stdin); |
03fd9c49 | 405 | o = fixup_output(context->std_output, socket_fd); |
4f2d528d | 406 | |
eb17e935 MS |
407 | if (fileno == STDERR_FILENO) { |
408 | ExecOutput e; | |
409 | e = fixup_output(context->std_error, socket_fd); | |
80876c20 | 410 | |
eb17e935 MS |
411 | /* This expects the input and output are already set up */ |
412 | ||
413 | /* Don't change the stderr file descriptor if we inherit all | |
414 | * the way and are not on a tty */ | |
415 | if (e == EXEC_OUTPUT_INHERIT && | |
416 | o == EXEC_OUTPUT_INHERIT && | |
417 | i == EXEC_INPUT_NULL && | |
418 | !is_terminal_input(context->std_input) && | |
419 | getppid () != 1) | |
420 | return fileno; | |
421 | ||
422 | /* Duplicate from stdout if possible */ | |
423 | if (e == o || e == EXEC_OUTPUT_INHERIT) | |
424 | return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno; | |
071830ff | 425 | |
eb17e935 | 426 | o = e; |
80876c20 | 427 | |
eb17e935 | 428 | } else if (o == EXEC_OUTPUT_INHERIT) { |
21d21ea4 LP |
429 | /* If input got downgraded, inherit the original value */ |
430 | if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input)) | |
eb17e935 | 431 | return open_terminal_as(tty_path(context), O_WRONLY, fileno); |
21d21ea4 | 432 | |
acb591e4 | 433 | /* If the input is connected to anything that's not a /dev/null, inherit that... */ |
ff876e28 | 434 | if (i != EXEC_INPUT_NULL) |
eb17e935 | 435 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; |
071830ff | 436 | |
acb591e4 LP |
437 | /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */ |
438 | if (getppid() != 1) | |
eb17e935 | 439 | return fileno; |
94f04347 | 440 | |
eb17e935 MS |
441 | /* We need to open /dev/null here anew, to get the right access mode. */ |
442 | return open_null_as(O_WRONLY, fileno); | |
071830ff | 443 | } |
94f04347 | 444 | |
eb17e935 | 445 | switch (o) { |
80876c20 LP |
446 | |
447 | case EXEC_OUTPUT_NULL: | |
eb17e935 | 448 | return open_null_as(O_WRONLY, fileno); |
80876c20 LP |
449 | |
450 | case EXEC_OUTPUT_TTY: | |
4f2d528d | 451 | if (is_terminal_input(i)) |
eb17e935 | 452 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; |
80876c20 LP |
453 | |
454 | /* We don't reset the terminal if this is just about output */ | |
eb17e935 | 455 | return open_terminal_as(tty_path(context), O_WRONLY, fileno); |
80876c20 LP |
456 | |
457 | case EXEC_OUTPUT_SYSLOG: | |
28dbc1e8 | 458 | case EXEC_OUTPUT_SYSLOG_AND_CONSOLE: |
9a6bca7a | 459 | case EXEC_OUTPUT_KMSG: |
28dbc1e8 | 460 | case EXEC_OUTPUT_KMSG_AND_CONSOLE: |
706343f4 LP |
461 | case EXEC_OUTPUT_JOURNAL: |
462 | case EXEC_OUTPUT_JOURNAL_AND_CONSOLE: | |
f2341e0a | 463 | r = connect_logger_as(context, o, ident, unit->id, fileno, uid, gid); |
47c1d80d | 464 | if (r < 0) { |
f2341e0a | 465 | log_unit_error_errno(unit, r, "Failed to connect %s to the journal socket, ignoring: %m", fileno == STDOUT_FILENO ? "stdout" : "stderr"); |
eb17e935 | 466 | r = open_null_as(O_WRONLY, fileno); |
47c1d80d MS |
467 | } |
468 | return r; | |
4f2d528d LP |
469 | |
470 | case EXEC_OUTPUT_SOCKET: | |
471 | assert(socket_fd >= 0); | |
eb17e935 | 472 | return dup2(socket_fd, fileno) < 0 ? -errno : fileno; |
94f04347 LP |
473 | |
474 | default: | |
80876c20 | 475 | assert_not_reached("Unknown error type"); |
94f04347 | 476 | } |
071830ff LP |
477 | } |
478 | ||
02a51aba LP |
479 | static int chown_terminal(int fd, uid_t uid) { |
480 | struct stat st; | |
481 | ||
482 | assert(fd >= 0); | |
02a51aba LP |
483 | |
484 | /* This might fail. What matters are the results. */ | |
bab45044 LP |
485 | (void) fchown(fd, uid, -1); |
486 | (void) fchmod(fd, TTY_MODE); | |
02a51aba LP |
487 | |
488 | if (fstat(fd, &st) < 0) | |
489 | return -errno; | |
490 | ||
d8b4e2e9 | 491 | if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE) |
02a51aba LP |
492 | return -EPERM; |
493 | ||
494 | return 0; | |
495 | } | |
496 | ||
af6da548 | 497 | static int setup_confirm_stdio(int *_saved_stdin, |
80876c20 LP |
498 | int *_saved_stdout) { |
499 | int fd = -1, saved_stdin, saved_stdout = -1, r; | |
500 | ||
80876c20 LP |
501 | assert(_saved_stdin); |
502 | assert(_saved_stdout); | |
503 | ||
af6da548 LP |
504 | saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3); |
505 | if (saved_stdin < 0) | |
506 | return -errno; | |
80876c20 | 507 | |
af6da548 LP |
508 | saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3); |
509 | if (saved_stdout < 0) { | |
510 | r = errno; | |
80876c20 LP |
511 | goto fail; |
512 | } | |
513 | ||
af6da548 LP |
514 | fd = acquire_terminal( |
515 | "/dev/console", | |
516 | false, | |
517 | false, | |
518 | false, | |
519 | DEFAULT_CONFIRM_USEC); | |
520 | if (fd < 0) { | |
521 | r = fd; | |
80876c20 LP |
522 | goto fail; |
523 | } | |
524 | ||
af6da548 LP |
525 | r = chown_terminal(fd, getuid()); |
526 | if (r < 0) | |
02a51aba | 527 | goto fail; |
02a51aba | 528 | |
80876c20 | 529 | if (dup2(fd, STDIN_FILENO) < 0) { |
af6da548 | 530 | r = -errno; |
80876c20 LP |
531 | goto fail; |
532 | } | |
533 | ||
534 | if (dup2(fd, STDOUT_FILENO) < 0) { | |
af6da548 | 535 | r = -errno; |
80876c20 LP |
536 | goto fail; |
537 | } | |
538 | ||
539 | if (fd >= 2) | |
03e334a1 | 540 | safe_close(fd); |
80876c20 LP |
541 | |
542 | *_saved_stdin = saved_stdin; | |
543 | *_saved_stdout = saved_stdout; | |
544 | ||
545 | return 0; | |
546 | ||
547 | fail: | |
03e334a1 LP |
548 | safe_close(saved_stdout); |
549 | safe_close(saved_stdin); | |
550 | safe_close(fd); | |
80876c20 LP |
551 | |
552 | return r; | |
553 | } | |
554 | ||
44b601bc | 555 | _printf_(1, 2) static int write_confirm_message(const char *format, ...) { |
03e334a1 | 556 | _cleanup_close_ int fd = -1; |
af6da548 | 557 | va_list ap; |
80876c20 | 558 | |
af6da548 | 559 | assert(format); |
80876c20 | 560 | |
af6da548 LP |
561 | fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); |
562 | if (fd < 0) | |
563 | return fd; | |
80876c20 | 564 | |
af6da548 LP |
565 | va_start(ap, format); |
566 | vdprintf(fd, format, ap); | |
567 | va_end(ap); | |
80876c20 | 568 | |
af6da548 LP |
569 | return 0; |
570 | } | |
80876c20 | 571 | |
af6da548 LP |
572 | static int restore_confirm_stdio(int *saved_stdin, |
573 | int *saved_stdout) { | |
80876c20 | 574 | |
af6da548 | 575 | int r = 0; |
80876c20 | 576 | |
af6da548 LP |
577 | assert(saved_stdin); |
578 | assert(saved_stdout); | |
579 | ||
580 | release_terminal(); | |
581 | ||
582 | if (*saved_stdin >= 0) | |
80876c20 | 583 | if (dup2(*saved_stdin, STDIN_FILENO) < 0) |
af6da548 | 584 | r = -errno; |
80876c20 | 585 | |
af6da548 | 586 | if (*saved_stdout >= 0) |
80876c20 | 587 | if (dup2(*saved_stdout, STDOUT_FILENO) < 0) |
af6da548 | 588 | r = -errno; |
80876c20 | 589 | |
03e334a1 LP |
590 | safe_close(*saved_stdin); |
591 | safe_close(*saved_stdout); | |
af6da548 LP |
592 | |
593 | return r; | |
594 | } | |
595 | ||
596 | static int ask_for_confirmation(char *response, char **argv) { | |
597 | int saved_stdout = -1, saved_stdin = -1, r; | |
e1d75803 | 598 | _cleanup_free_ char *line = NULL; |
af6da548 LP |
599 | |
600 | r = setup_confirm_stdio(&saved_stdin, &saved_stdout); | |
601 | if (r < 0) | |
602 | return r; | |
603 | ||
604 | line = exec_command_line(argv); | |
605 | if (!line) | |
606 | return -ENOMEM; | |
607 | ||
418b9be5 | 608 | r = ask_char(response, "yns", "Execute %s? [Yes, No, Skip] ", line); |
af6da548 LP |
609 | |
610 | restore_confirm_stdio(&saved_stdin, &saved_stdout); | |
611 | ||
612 | return r; | |
80876c20 LP |
613 | } |
614 | ||
81a2b7ce LP |
615 | static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) { |
616 | bool keep_groups = false; | |
617 | int r; | |
618 | ||
619 | assert(context); | |
620 | ||
35b8ca3a | 621 | /* Lookup and set GID and supplementary group list. Here too |
81a2b7ce LP |
622 | * we avoid NSS lookups for gid=0. */ |
623 | ||
624 | if (context->group || username) { | |
625 | ||
4b67834e LP |
626 | if (context->group) { |
627 | const char *g = context->group; | |
628 | ||
629 | if ((r = get_group_creds(&g, &gid)) < 0) | |
81a2b7ce | 630 | return r; |
4b67834e | 631 | } |
81a2b7ce LP |
632 | |
633 | /* First step, initialize groups from /etc/groups */ | |
634 | if (username && gid != 0) { | |
635 | if (initgroups(username, gid) < 0) | |
636 | return -errno; | |
637 | ||
638 | keep_groups = true; | |
639 | } | |
640 | ||
641 | /* Second step, set our gids */ | |
642 | if (setresgid(gid, gid, gid) < 0) | |
643 | return -errno; | |
644 | } | |
645 | ||
646 | if (context->supplementary_groups) { | |
647 | int ngroups_max, k; | |
648 | gid_t *gids; | |
649 | char **i; | |
650 | ||
651 | /* Final step, initialize any manually set supplementary groups */ | |
da19d5c1 | 652 | assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0); |
81a2b7ce LP |
653 | |
654 | if (!(gids = new(gid_t, ngroups_max))) | |
655 | return -ENOMEM; | |
656 | ||
657 | if (keep_groups) { | |
658 | if ((k = getgroups(ngroups_max, gids)) < 0) { | |
659 | free(gids); | |
660 | return -errno; | |
661 | } | |
662 | } else | |
663 | k = 0; | |
664 | ||
665 | STRV_FOREACH(i, context->supplementary_groups) { | |
4b67834e | 666 | const char *g; |
81a2b7ce LP |
667 | |
668 | if (k >= ngroups_max) { | |
669 | free(gids); | |
670 | return -E2BIG; | |
671 | } | |
672 | ||
4b67834e LP |
673 | g = *i; |
674 | r = get_group_creds(&g, gids+k); | |
675 | if (r < 0) { | |
81a2b7ce LP |
676 | free(gids); |
677 | return r; | |
678 | } | |
679 | ||
680 | k++; | |
681 | } | |
682 | ||
683 | if (setgroups(k, gids) < 0) { | |
684 | free(gids); | |
685 | return -errno; | |
686 | } | |
687 | ||
688 | free(gids); | |
689 | } | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
694 | static int enforce_user(const ExecContext *context, uid_t uid) { | |
81a2b7ce LP |
695 | assert(context); |
696 | ||
697 | /* Sets (but doesn't lookup) the uid and make sure we keep the | |
698 | * capabilities while doing so. */ | |
699 | ||
700 | if (context->capabilities) { | |
5ce70e5b | 701 | _cleanup_cap_free_ cap_t d = NULL; |
81a2b7ce LP |
702 | static const cap_value_t bits[] = { |
703 | CAP_SETUID, /* Necessary so that we can run setresuid() below */ | |
704 | CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */ | |
705 | }; | |
706 | ||
707 | /* First step: If we need to keep capabilities but | |
708 | * drop privileges we need to make sure we keep our | |
cbb21cca | 709 | * caps, while we drop privileges. */ |
693ced48 | 710 | if (uid != 0) { |
cbb21cca | 711 | int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS; |
693ced48 LP |
712 | |
713 | if (prctl(PR_GET_SECUREBITS) != sb) | |
714 | if (prctl(PR_SET_SECUREBITS, sb) < 0) | |
715 | return -errno; | |
716 | } | |
81a2b7ce | 717 | |
35b8ca3a | 718 | /* Second step: set the capabilities. This will reduce |
81a2b7ce LP |
719 | * the capabilities to the minimum we need. */ |
720 | ||
5ce70e5b ZJS |
721 | d = cap_dup(context->capabilities); |
722 | if (!d) | |
81a2b7ce LP |
723 | return -errno; |
724 | ||
725 | if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 || | |
5ce70e5b ZJS |
726 | cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) |
727 | return -errno; | |
81a2b7ce | 728 | |
5ce70e5b ZJS |
729 | if (cap_set_proc(d) < 0) |
730 | return -errno; | |
81a2b7ce LP |
731 | } |
732 | ||
733 | /* Third step: actually set the uids */ | |
734 | if (setresuid(uid, uid, uid) < 0) | |
735 | return -errno; | |
736 | ||
737 | /* At this point we should have all necessary capabilities but | |
738 | are otherwise a normal user. However, the caps might got | |
739 | corrupted due to the setresuid() so we need clean them up | |
740 | later. This is done outside of this call. */ | |
741 | ||
742 | return 0; | |
743 | } | |
744 | ||
5b6319dc LP |
745 | #ifdef HAVE_PAM |
746 | ||
747 | static int null_conv( | |
748 | int num_msg, | |
749 | const struct pam_message **msg, | |
750 | struct pam_response **resp, | |
751 | void *appdata_ptr) { | |
752 | ||
753 | /* We don't support conversations */ | |
754 | ||
755 | return PAM_CONV_ERR; | |
756 | } | |
757 | ||
758 | static int setup_pam( | |
759 | const char *name, | |
760 | const char *user, | |
940c5210 | 761 | uid_t uid, |
5b6319dc LP |
762 | const char *tty, |
763 | char ***pam_env, | |
764 | int fds[], unsigned n_fds) { | |
765 | ||
766 | static const struct pam_conv conv = { | |
767 | .conv = null_conv, | |
768 | .appdata_ptr = NULL | |
769 | }; | |
770 | ||
771 | pam_handle_t *handle = NULL; | |
772 | sigset_t ss, old_ss; | |
773 | int pam_code = PAM_SUCCESS; | |
9ba35398 | 774 | int err; |
5b6319dc LP |
775 | char **e = NULL; |
776 | bool close_session = false; | |
777 | pid_t pam_pid = 0, parent_pid; | |
970edce6 | 778 | int flags = 0; |
5b6319dc LP |
779 | |
780 | assert(name); | |
781 | assert(user); | |
782 | assert(pam_env); | |
783 | ||
784 | /* We set up PAM in the parent process, then fork. The child | |
35b8ca3a | 785 | * will then stay around until killed via PR_GET_PDEATHSIG or |
5b6319dc LP |
786 | * systemd via the cgroup logic. It will then remove the PAM |
787 | * session again. The parent process will exec() the actual | |
788 | * daemon. We do things this way to ensure that the main PID | |
789 | * of the daemon is the one we initially fork()ed. */ | |
790 | ||
553d2243 | 791 | if (log_get_max_level() < LOG_DEBUG) |
970edce6 ZJS |
792 | flags |= PAM_SILENT; |
793 | ||
f546241b ZJS |
794 | pam_code = pam_start(name, user, &conv, &handle); |
795 | if (pam_code != PAM_SUCCESS) { | |
5b6319dc LP |
796 | handle = NULL; |
797 | goto fail; | |
798 | } | |
799 | ||
f546241b ZJS |
800 | if (tty) { |
801 | pam_code = pam_set_item(handle, PAM_TTY, tty); | |
802 | if (pam_code != PAM_SUCCESS) | |
5b6319dc | 803 | goto fail; |
f546241b | 804 | } |
5b6319dc | 805 | |
970edce6 | 806 | pam_code = pam_acct_mgmt(handle, flags); |
f546241b | 807 | if (pam_code != PAM_SUCCESS) |
5b6319dc LP |
808 | goto fail; |
809 | ||
970edce6 | 810 | pam_code = pam_open_session(handle, flags); |
f546241b | 811 | if (pam_code != PAM_SUCCESS) |
5b6319dc LP |
812 | goto fail; |
813 | ||
814 | close_session = true; | |
815 | ||
f546241b ZJS |
816 | e = pam_getenvlist(handle); |
817 | if (!e) { | |
5b6319dc LP |
818 | pam_code = PAM_BUF_ERR; |
819 | goto fail; | |
820 | } | |
821 | ||
822 | /* Block SIGTERM, so that we know that it won't get lost in | |
823 | * the child */ | |
824 | if (sigemptyset(&ss) < 0 || | |
825 | sigaddset(&ss, SIGTERM) < 0 || | |
826 | sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0) | |
827 | goto fail; | |
828 | ||
829 | parent_pid = getpid(); | |
830 | ||
f546241b ZJS |
831 | pam_pid = fork(); |
832 | if (pam_pid < 0) | |
5b6319dc LP |
833 | goto fail; |
834 | ||
835 | if (pam_pid == 0) { | |
836 | int sig; | |
837 | int r = EXIT_PAM; | |
838 | ||
839 | /* The child's job is to reset the PAM session on | |
840 | * termination */ | |
841 | ||
842 | /* This string must fit in 10 chars (i.e. the length | |
5d6b1584 LP |
843 | * of "/sbin/init"), to look pretty in /bin/ps */ |
844 | rename_process("(sd-pam)"); | |
5b6319dc LP |
845 | |
846 | /* Make sure we don't keep open the passed fds in this | |
847 | child. We assume that otherwise only those fds are | |
848 | open here that have been opened by PAM. */ | |
849 | close_many(fds, n_fds); | |
850 | ||
940c5210 AK |
851 | /* Drop privileges - we don't need any to pam_close_session |
852 | * and this will make PR_SET_PDEATHSIG work in most cases. | |
853 | * If this fails, ignore the error - but expect sd-pam threads | |
854 | * to fail to exit normally */ | |
855 | if (setresuid(uid, uid, uid) < 0) | |
da927ba9 | 856 | log_error_errno(r, "Error: Failed to setresuid() in sd-pam: %m"); |
940c5210 AK |
857 | |
858 | /* Wait until our parent died. This will only work if | |
859 | * the above setresuid() succeeds, otherwise the kernel | |
860 | * will not allow unprivileged parents kill their privileged | |
861 | * children this way. We rely on the control groups kill logic | |
5b6319dc LP |
862 | * to do the rest for us. */ |
863 | if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) | |
864 | goto child_finish; | |
865 | ||
866 | /* Check if our parent process might already have | |
867 | * died? */ | |
868 | if (getppid() == parent_pid) { | |
3dead8d9 LP |
869 | for (;;) { |
870 | if (sigwait(&ss, &sig) < 0) { | |
871 | if (errno == EINTR) | |
872 | continue; | |
873 | ||
874 | goto child_finish; | |
875 | } | |
5b6319dc | 876 | |
3dead8d9 LP |
877 | assert(sig == SIGTERM); |
878 | break; | |
879 | } | |
5b6319dc LP |
880 | } |
881 | ||
3dead8d9 | 882 | /* If our parent died we'll end the session */ |
f546241b | 883 | if (getppid() != parent_pid) { |
970edce6 | 884 | pam_code = pam_close_session(handle, flags); |
f546241b | 885 | if (pam_code != PAM_SUCCESS) |
5b6319dc | 886 | goto child_finish; |
f546241b | 887 | } |
5b6319dc LP |
888 | |
889 | r = 0; | |
890 | ||
891 | child_finish: | |
970edce6 | 892 | pam_end(handle, pam_code | flags); |
5b6319dc LP |
893 | _exit(r); |
894 | } | |
895 | ||
896 | /* If the child was forked off successfully it will do all the | |
897 | * cleanups, so forget about the handle here. */ | |
898 | handle = NULL; | |
899 | ||
3b8bddde | 900 | /* Unblock SIGTERM again in the parent */ |
5b6319dc LP |
901 | if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0) |
902 | goto fail; | |
903 | ||
904 | /* We close the log explicitly here, since the PAM modules | |
905 | * might have opened it, but we don't want this fd around. */ | |
906 | closelog(); | |
907 | ||
aa87e624 LP |
908 | *pam_env = e; |
909 | e = NULL; | |
910 | ||
5b6319dc LP |
911 | return 0; |
912 | ||
913 | fail: | |
970edce6 ZJS |
914 | if (pam_code != PAM_SUCCESS) { |
915 | log_error("PAM failed: %s", pam_strerror(handle, pam_code)); | |
9ba35398 | 916 | err = -EPERM; /* PAM errors do not map to errno */ |
970edce6 | 917 | } else { |
56f64d95 | 918 | log_error_errno(errno, "PAM failed: %m"); |
9ba35398 | 919 | err = -errno; |
970edce6 | 920 | } |
9ba35398 | 921 | |
5b6319dc LP |
922 | if (handle) { |
923 | if (close_session) | |
970edce6 | 924 | pam_code = pam_close_session(handle, flags); |
5b6319dc | 925 | |
970edce6 | 926 | pam_end(handle, pam_code | flags); |
5b6319dc LP |
927 | } |
928 | ||
929 | strv_free(e); | |
930 | ||
931 | closelog(); | |
932 | ||
430c18ed | 933 | if (pam_pid > 1) { |
5b6319dc | 934 | kill(pam_pid, SIGTERM); |
430c18ed LP |
935 | kill(pam_pid, SIGCONT); |
936 | } | |
5b6319dc | 937 | |
9ba35398 | 938 | return err; |
5b6319dc LP |
939 | } |
940 | #endif | |
941 | ||
5d6b1584 LP |
942 | static void rename_process_from_path(const char *path) { |
943 | char process_name[11]; | |
944 | const char *p; | |
945 | size_t l; | |
946 | ||
947 | /* This resulting string must fit in 10 chars (i.e. the length | |
948 | * of "/sbin/init") to look pretty in /bin/ps */ | |
949 | ||
2b6bf07d | 950 | p = basename(path); |
5d6b1584 LP |
951 | if (isempty(p)) { |
952 | rename_process("(...)"); | |
953 | return; | |
954 | } | |
955 | ||
956 | l = strlen(p); | |
957 | if (l > 8) { | |
958 | /* The end of the process name is usually more | |
959 | * interesting, since the first bit might just be | |
960 | * "systemd-" */ | |
961 | p = p + l - 8; | |
962 | l = 8; | |
963 | } | |
964 | ||
965 | process_name[0] = '('; | |
966 | memcpy(process_name+1, p, l); | |
967 | process_name[1+l] = ')'; | |
968 | process_name[1+l+1] = 0; | |
969 | ||
970 | rename_process(process_name); | |
971 | } | |
972 | ||
c0467cf3 | 973 | #ifdef HAVE_SECCOMP |
17df7223 | 974 | |
822a5960 | 975 | static int apply_seccomp(const ExecContext *c) { |
17df7223 LP |
976 | uint32_t negative_action, action; |
977 | scmp_filter_ctx *seccomp; | |
c0467cf3 RC |
978 | Iterator i; |
979 | void *id; | |
17df7223 | 980 | int r; |
8351ceae | 981 | |
c0467cf3 | 982 | assert(c); |
8351ceae | 983 | |
17df7223 LP |
984 | negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno); |
985 | ||
986 | seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW); | |
987 | if (!seccomp) | |
988 | return -ENOMEM; | |
8351ceae | 989 | |
e9642be2 LP |
990 | if (c->syscall_archs) { |
991 | ||
992 | SET_FOREACH(id, c->syscall_archs, i) { | |
993 | r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1); | |
994 | if (r == -EEXIST) | |
995 | continue; | |
7c66bae2 LP |
996 | if (r < 0) |
997 | goto finish; | |
e9642be2 | 998 | } |
e9642be2 | 999 | |
7c66bae2 | 1000 | } else { |
e9642be2 | 1001 | r = seccomp_add_secondary_archs(seccomp); |
7c66bae2 LP |
1002 | if (r < 0) |
1003 | goto finish; | |
57183d11 | 1004 | } |
8351ceae | 1005 | |
57183d11 | 1006 | action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action; |
17df7223 LP |
1007 | SET_FOREACH(id, c->syscall_filter, i) { |
1008 | r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0); | |
7c66bae2 LP |
1009 | if (r < 0) |
1010 | goto finish; | |
c0467cf3 | 1011 | } |
8351ceae | 1012 | |
7c66bae2 LP |
1013 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); |
1014 | if (r < 0) | |
1015 | goto finish; | |
1016 | ||
17df7223 | 1017 | r = seccomp_load(seccomp); |
7c66bae2 LP |
1018 | |
1019 | finish: | |
17df7223 | 1020 | seccomp_release(seccomp); |
4298d0b5 LP |
1021 | return r; |
1022 | } | |
1023 | ||
822a5960 | 1024 | static int apply_address_families(const ExecContext *c) { |
4298d0b5 LP |
1025 | scmp_filter_ctx *seccomp; |
1026 | Iterator i; | |
1027 | int r; | |
1028 | ||
1029 | assert(c); | |
1030 | ||
1031 | seccomp = seccomp_init(SCMP_ACT_ALLOW); | |
1032 | if (!seccomp) | |
1033 | return -ENOMEM; | |
1034 | ||
1035 | r = seccomp_add_secondary_archs(seccomp); | |
1036 | if (r < 0) | |
1037 | goto finish; | |
1038 | ||
1039 | if (c->address_families_whitelist) { | |
1040 | int af, first = 0, last = 0; | |
1041 | void *afp; | |
1042 | ||
1043 | /* If this is a whitelist, we first block the address | |
1044 | * families that are out of range and then everything | |
1045 | * that is not in the set. First, we find the lowest | |
1046 | * and highest address family in the set. */ | |
1047 | ||
1048 | SET_FOREACH(afp, c->address_families, i) { | |
1049 | af = PTR_TO_INT(afp); | |
17df7223 | 1050 | |
4298d0b5 LP |
1051 | if (af <= 0 || af >= af_max()) |
1052 | continue; | |
1053 | ||
1054 | if (first == 0 || af < first) | |
1055 | first = af; | |
1056 | ||
1057 | if (last == 0 || af > last) | |
1058 | last = af; | |
1059 | } | |
1060 | ||
1061 | assert((first == 0) == (last == 0)); | |
1062 | ||
1063 | if (first == 0) { | |
1064 | ||
1065 | /* No entries in the valid range, block everything */ | |
1066 | r = seccomp_rule_add( | |
1067 | seccomp, | |
1068 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1069 | SCMP_SYS(socket), | |
1070 | 0); | |
1071 | if (r < 0) | |
1072 | goto finish; | |
1073 | ||
1074 | } else { | |
1075 | ||
1076 | /* Block everything below the first entry */ | |
1077 | r = seccomp_rule_add( | |
1078 | seccomp, | |
1079 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1080 | SCMP_SYS(socket), | |
1081 | 1, | |
1082 | SCMP_A0(SCMP_CMP_LT, first)); | |
1083 | if (r < 0) | |
1084 | goto finish; | |
1085 | ||
1086 | /* Block everything above the last entry */ | |
1087 | r = seccomp_rule_add( | |
1088 | seccomp, | |
1089 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1090 | SCMP_SYS(socket), | |
1091 | 1, | |
1092 | SCMP_A0(SCMP_CMP_GT, last)); | |
1093 | if (r < 0) | |
1094 | goto finish; | |
1095 | ||
1096 | /* Block everything between the first and last | |
1097 | * entry */ | |
1098 | for (af = 1; af < af_max(); af++) { | |
1099 | ||
1100 | if (set_contains(c->address_families, INT_TO_PTR(af))) | |
1101 | continue; | |
1102 | ||
1103 | r = seccomp_rule_add( | |
1104 | seccomp, | |
1105 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1106 | SCMP_SYS(socket), | |
1107 | 1, | |
1108 | SCMP_A0(SCMP_CMP_EQ, af)); | |
1109 | if (r < 0) | |
1110 | goto finish; | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | } else { | |
1115 | void *af; | |
1116 | ||
1117 | /* If this is a blacklist, then generate one rule for | |
1118 | * each address family that are then combined in OR | |
1119 | * checks. */ | |
1120 | ||
1121 | SET_FOREACH(af, c->address_families, i) { | |
1122 | ||
1123 | r = seccomp_rule_add( | |
1124 | seccomp, | |
1125 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1126 | SCMP_SYS(socket), | |
1127 | 1, | |
1128 | SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af))); | |
1129 | if (r < 0) | |
1130 | goto finish; | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1135 | if (r < 0) | |
1136 | goto finish; | |
1137 | ||
1138 | r = seccomp_load(seccomp); | |
1139 | ||
1140 | finish: | |
1141 | seccomp_release(seccomp); | |
17df7223 | 1142 | return r; |
8351ceae | 1143 | } |
4298d0b5 | 1144 | |
c0467cf3 | 1145 | #endif |
8351ceae | 1146 | |
31a7eb86 ZJS |
1147 | static void do_idle_pipe_dance(int idle_pipe[4]) { |
1148 | assert(idle_pipe); | |
1149 | ||
03e334a1 LP |
1150 | |
1151 | safe_close(idle_pipe[1]); | |
1152 | safe_close(idle_pipe[2]); | |
31a7eb86 ZJS |
1153 | |
1154 | if (idle_pipe[0] >= 0) { | |
1155 | int r; | |
1156 | ||
1157 | r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC); | |
1158 | ||
1159 | if (idle_pipe[3] >= 0 && r == 0 /* timeout */) { | |
1160 | /* Signal systemd that we are bored and want to continue. */ | |
cd972d69 ZJS |
1161 | r = write(idle_pipe[3], "x", 1); |
1162 | if (r > 0) | |
1163 | /* Wait for systemd to react to the signal above. */ | |
1164 | fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC); | |
31a7eb86 ZJS |
1165 | } |
1166 | ||
03e334a1 | 1167 | safe_close(idle_pipe[0]); |
31a7eb86 ZJS |
1168 | |
1169 | } | |
1170 | ||
03e334a1 | 1171 | safe_close(idle_pipe[3]); |
31a7eb86 ZJS |
1172 | } |
1173 | ||
7cae38c4 | 1174 | static int build_environment( |
9fa95f85 | 1175 | const ExecContext *c, |
7cae38c4 | 1176 | unsigned n_fds, |
09812eb7 | 1177 | usec_t watchdog_usec, |
7cae38c4 LP |
1178 | const char *home, |
1179 | const char *username, | |
1180 | const char *shell, | |
1181 | char ***ret) { | |
1182 | ||
1183 | _cleanup_strv_free_ char **our_env = NULL; | |
1184 | unsigned n_env = 0; | |
1185 | char *x; | |
1186 | ||
1187 | assert(c); | |
1188 | assert(ret); | |
1189 | ||
09812eb7 | 1190 | our_env = new0(char*, 10); |
7cae38c4 LP |
1191 | if (!our_env) |
1192 | return -ENOMEM; | |
1193 | ||
1194 | if (n_fds > 0) { | |
ccd06097 | 1195 | if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0) |
7cae38c4 LP |
1196 | return -ENOMEM; |
1197 | our_env[n_env++] = x; | |
1198 | ||
1199 | if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0) | |
1200 | return -ENOMEM; | |
1201 | our_env[n_env++] = x; | |
1202 | } | |
1203 | ||
09812eb7 | 1204 | if (watchdog_usec > 0) { |
ccd06097 | 1205 | if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0) |
09812eb7 LP |
1206 | return -ENOMEM; |
1207 | our_env[n_env++] = x; | |
1208 | ||
de0671ee | 1209 | if (asprintf(&x, "WATCHDOG_USEC="USEC_FMT, watchdog_usec) < 0) |
09812eb7 LP |
1210 | return -ENOMEM; |
1211 | our_env[n_env++] = x; | |
1212 | } | |
1213 | ||
7cae38c4 LP |
1214 | if (home) { |
1215 | x = strappend("HOME=", home); | |
1216 | if (!x) | |
1217 | return -ENOMEM; | |
1218 | our_env[n_env++] = x; | |
1219 | } | |
1220 | ||
1221 | if (username) { | |
1222 | x = strappend("LOGNAME=", username); | |
1223 | if (!x) | |
1224 | return -ENOMEM; | |
1225 | our_env[n_env++] = x; | |
1226 | ||
1227 | x = strappend("USER=", username); | |
1228 | if (!x) | |
1229 | return -ENOMEM; | |
1230 | our_env[n_env++] = x; | |
1231 | } | |
1232 | ||
1233 | if (shell) { | |
1234 | x = strappend("SHELL=", shell); | |
1235 | if (!x) | |
1236 | return -ENOMEM; | |
1237 | our_env[n_env++] = x; | |
1238 | } | |
1239 | ||
1240 | if (is_terminal_input(c->std_input) || | |
1241 | c->std_output == EXEC_OUTPUT_TTY || | |
1242 | c->std_error == EXEC_OUTPUT_TTY || | |
1243 | c->tty_path) { | |
1244 | ||
1245 | x = strdup(default_term_for_tty(tty_path(c))); | |
1246 | if (!x) | |
1247 | return -ENOMEM; | |
1248 | our_env[n_env++] = x; | |
1249 | } | |
1250 | ||
1251 | our_env[n_env++] = NULL; | |
09812eb7 | 1252 | assert(n_env <= 10); |
7cae38c4 LP |
1253 | |
1254 | *ret = our_env; | |
1255 | our_env = NULL; | |
1256 | ||
1257 | return 0; | |
1258 | } | |
1259 | ||
ff0af2a1 | 1260 | static int exec_child( |
f2341e0a | 1261 | Unit *unit, |
ff0af2a1 LP |
1262 | ExecCommand *command, |
1263 | const ExecContext *context, | |
1264 | const ExecParameters *params, | |
1265 | ExecRuntime *runtime, | |
1266 | char **argv, | |
1267 | int socket_fd, | |
1268 | int *fds, unsigned n_fds, | |
1269 | char **files_env, | |
1270 | int *exit_status) { | |
d35fbf6b DM |
1271 | |
1272 | _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL; | |
9008e1ac | 1273 | _cleanup_free_ char *mac_selinux_context_net = NULL; |
d35fbf6b DM |
1274 | const char *username = NULL, *home = NULL, *shell = NULL; |
1275 | unsigned n_dont_close = 0; | |
e44da745 | 1276 | int dont_close[n_fds + 4]; |
fed1e721 LP |
1277 | uid_t uid = UID_INVALID; |
1278 | gid_t gid = GID_INVALID; | |
ff0af2a1 | 1279 | int i, r; |
034c6ed7 | 1280 | |
f2341e0a | 1281 | assert(unit); |
5cb5a6ff LP |
1282 | assert(command); |
1283 | assert(context); | |
d35fbf6b | 1284 | assert(params); |
ff0af2a1 | 1285 | assert(exit_status); |
d35fbf6b DM |
1286 | |
1287 | rename_process_from_path(command->path); | |
1288 | ||
1289 | /* We reset exactly these signals, since they are the | |
1290 | * only ones we set to SIG_IGN in the main daemon. All | |
1291 | * others we leave untouched because we set them to | |
1292 | * SIG_DFL or a valid handler initially, both of which | |
1293 | * will be demoted to SIG_DFL. */ | |
1294 | default_signals(SIGNALS_CRASH_HANDLER, | |
1295 | SIGNALS_IGNORE, -1); | |
1296 | ||
1297 | if (context->ignore_sigpipe) | |
1298 | ignore_signals(SIGPIPE, -1); | |
1299 | ||
ff0af2a1 LP |
1300 | r = reset_signal_mask(); |
1301 | if (r < 0) { | |
1302 | *exit_status = EXIT_SIGNAL_MASK; | |
1303 | return r; | |
d35fbf6b | 1304 | } |
034c6ed7 | 1305 | |
d35fbf6b DM |
1306 | if (params->idle_pipe) |
1307 | do_idle_pipe_dance(params->idle_pipe); | |
4f2d528d | 1308 | |
d35fbf6b DM |
1309 | /* Close sockets very early to make sure we don't |
1310 | * block init reexecution because it cannot bind its | |
1311 | * sockets */ | |
ff0af2a1 | 1312 | |
d35fbf6b | 1313 | log_forget_fds(); |
4f2d528d | 1314 | |
d35fbf6b DM |
1315 | if (socket_fd >= 0) |
1316 | dont_close[n_dont_close++] = socket_fd; | |
1317 | if (n_fds > 0) { | |
1318 | memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds); | |
1319 | n_dont_close += n_fds; | |
1320 | } | |
e44da745 DM |
1321 | if (params->bus_endpoint_fd >= 0) |
1322 | dont_close[n_dont_close++] = params->bus_endpoint_fd; | |
d35fbf6b DM |
1323 | if (runtime) { |
1324 | if (runtime->netns_storage_socket[0] >= 0) | |
1325 | dont_close[n_dont_close++] = runtime->netns_storage_socket[0]; | |
1326 | if (runtime->netns_storage_socket[1] >= 0) | |
1327 | dont_close[n_dont_close++] = runtime->netns_storage_socket[1]; | |
9fa95f85 | 1328 | } |
4f2d528d | 1329 | |
ff0af2a1 LP |
1330 | r = close_all_fds(dont_close, n_dont_close); |
1331 | if (r < 0) { | |
1332 | *exit_status = EXIT_FDS; | |
1333 | return r; | |
8c7be95e LP |
1334 | } |
1335 | ||
d35fbf6b DM |
1336 | if (!context->same_pgrp) |
1337 | if (setsid() < 0) { | |
ff0af2a1 | 1338 | *exit_status = EXIT_SETSID; |
d35fbf6b DM |
1339 | return -errno; |
1340 | } | |
9e2f7c11 | 1341 | |
d35fbf6b DM |
1342 | exec_context_tty_reset(context); |
1343 | ||
1344 | if (params->confirm_spawn) { | |
1345 | char response; | |
1346 | ||
ff0af2a1 LP |
1347 | r = ask_for_confirmation(&response, argv); |
1348 | if (r == -ETIMEDOUT) | |
d35fbf6b | 1349 | write_confirm_message("Confirmation question timed out, assuming positive response.\n"); |
ff0af2a1 LP |
1350 | else if (r < 0) |
1351 | write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-r)); | |
d35fbf6b DM |
1352 | else if (response == 's') { |
1353 | write_confirm_message("Skipping execution.\n"); | |
ff0af2a1 | 1354 | *exit_status = EXIT_CONFIRM; |
d35fbf6b DM |
1355 | return -ECANCELED; |
1356 | } else if (response == 'n') { | |
1357 | write_confirm_message("Failing execution.\n"); | |
ff0af2a1 | 1358 | *exit_status = 0; |
d35fbf6b DM |
1359 | return 0; |
1360 | } | |
1361 | } | |
1a63a750 | 1362 | |
524daa8c ZJS |
1363 | if (context->user) { |
1364 | username = context->user; | |
ff0af2a1 LP |
1365 | r = get_user_creds(&username, &uid, &gid, &home, &shell); |
1366 | if (r < 0) { | |
1367 | *exit_status = EXIT_USER; | |
1368 | return r; | |
524daa8c ZJS |
1369 | } |
1370 | } | |
1371 | ||
d35fbf6b DM |
1372 | /* If a socket is connected to STDIN/STDOUT/STDERR, we |
1373 | * must sure to drop O_NONBLOCK */ | |
1374 | if (socket_fd >= 0) | |
1375 | fd_nonblock(socket_fd, false); | |
acbb0225 | 1376 | |
ff0af2a1 LP |
1377 | r = setup_input(context, socket_fd, params->apply_tty_stdin); |
1378 | if (r < 0) { | |
1379 | *exit_status = EXIT_STDIN; | |
1380 | return r; | |
d35fbf6b | 1381 | } |
034c6ed7 | 1382 | |
f2341e0a | 1383 | r = setup_output(unit, context, STDOUT_FILENO, socket_fd, basename(command->path), params->apply_tty_stdin, uid, gid); |
ff0af2a1 LP |
1384 | if (r < 0) { |
1385 | *exit_status = EXIT_STDOUT; | |
1386 | return r; | |
d35fbf6b DM |
1387 | } |
1388 | ||
f2341e0a | 1389 | r = setup_output(unit, context, STDERR_FILENO, socket_fd, basename(command->path), params->apply_tty_stdin, uid, gid); |
ff0af2a1 LP |
1390 | if (r < 0) { |
1391 | *exit_status = EXIT_STDERR; | |
1392 | return r; | |
d35fbf6b DM |
1393 | } |
1394 | ||
1395 | if (params->cgroup_path) { | |
ff0af2a1 LP |
1396 | r = cg_attach_everywhere(params->cgroup_supported, params->cgroup_path, 0, NULL, NULL); |
1397 | if (r < 0) { | |
1398 | *exit_status = EXIT_CGROUP; | |
1399 | return r; | |
309bff19 | 1400 | } |
d35fbf6b | 1401 | } |
309bff19 | 1402 | |
d35fbf6b | 1403 | if (context->oom_score_adjust_set) { |
d5243d62 | 1404 | char t[DECIMAL_STR_MAX(context->oom_score_adjust)]; |
f2b68789 | 1405 | |
d5243d62 LP |
1406 | /* When we can't make this change due to EPERM, then |
1407 | * let's silently skip over it. User namespaces | |
1408 | * prohibit write access to this file, and we | |
1409 | * shouldn't trip up over that. */ | |
613b411c | 1410 | |
d5243d62 | 1411 | sprintf(t, "%i", context->oom_score_adjust); |
ff0af2a1 | 1412 | r = write_string_file("/proc/self/oom_score_adj", t); |
6cb7fa17 | 1413 | if (r == -EPERM || r == -EACCES) { |
ff0af2a1 | 1414 | log_open(); |
f2341e0a | 1415 | log_unit_debug_errno(unit, r, "Failed to adjust OOM setting, assuming containerized execution, ignoring: %m"); |
ff0af2a1 LP |
1416 | log_close(); |
1417 | } else if (r < 0) { | |
1418 | *exit_status = EXIT_OOM_ADJUST; | |
d35fbf6b | 1419 | return -errno; |
613b411c | 1420 | } |
d35fbf6b DM |
1421 | } |
1422 | ||
1423 | if (context->nice_set) | |
1424 | if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) { | |
ff0af2a1 | 1425 | *exit_status = EXIT_NICE; |
d35fbf6b | 1426 | return -errno; |
613b411c LP |
1427 | } |
1428 | ||
d35fbf6b DM |
1429 | if (context->cpu_sched_set) { |
1430 | struct sched_param param = { | |
1431 | .sched_priority = context->cpu_sched_priority, | |
1432 | }; | |
1433 | ||
ff0af2a1 LP |
1434 | r = sched_setscheduler(0, |
1435 | context->cpu_sched_policy | | |
1436 | (context->cpu_sched_reset_on_fork ? | |
1437 | SCHED_RESET_ON_FORK : 0), | |
1438 | ¶m); | |
1439 | if (r < 0) { | |
1440 | *exit_status = EXIT_SETSCHEDULER; | |
d35fbf6b | 1441 | return -errno; |
fc9b2a84 | 1442 | } |
d35fbf6b | 1443 | } |
fc9b2a84 | 1444 | |
d35fbf6b DM |
1445 | if (context->cpuset) |
1446 | if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) { | |
ff0af2a1 | 1447 | *exit_status = EXIT_CPUAFFINITY; |
d35fbf6b | 1448 | return -errno; |
034c6ed7 LP |
1449 | } |
1450 | ||
d35fbf6b DM |
1451 | if (context->ioprio_set) |
1452 | if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) { | |
ff0af2a1 | 1453 | *exit_status = EXIT_IOPRIO; |
d35fbf6b DM |
1454 | return -errno; |
1455 | } | |
da726a4d | 1456 | |
d35fbf6b DM |
1457 | if (context->timer_slack_nsec != NSEC_INFINITY) |
1458 | if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) { | |
ff0af2a1 | 1459 | *exit_status = EXIT_TIMERSLACK; |
d35fbf6b | 1460 | return -errno; |
4c2630eb | 1461 | } |
9eba9da4 | 1462 | |
d35fbf6b DM |
1463 | if (context->personality != 0xffffffffUL) |
1464 | if (personality(context->personality) < 0) { | |
ff0af2a1 | 1465 | *exit_status = EXIT_PERSONALITY; |
d35fbf6b | 1466 | return -errno; |
4c2630eb | 1467 | } |
94f04347 | 1468 | |
d35fbf6b DM |
1469 | if (context->utmp_id) |
1470 | utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path); | |
1471 | ||
524daa8c | 1472 | if (context->user && is_terminal_input(context->std_input)) { |
ff0af2a1 LP |
1473 | r = chown_terminal(STDIN_FILENO, uid); |
1474 | if (r < 0) { | |
1475 | *exit_status = EXIT_STDIN; | |
1476 | return r; | |
071830ff | 1477 | } |
d35fbf6b | 1478 | } |
8e274523 | 1479 | |
e44da745 DM |
1480 | #ifdef ENABLE_KDBUS |
1481 | if (params->bus_endpoint_fd >= 0 && context->bus_endpoint) { | |
fed1e721 | 1482 | uid_t ep_uid = (uid == UID_INVALID) ? 0 : uid; |
e44da745 | 1483 | |
ff0af2a1 LP |
1484 | r = bus_kernel_set_endpoint_policy(params->bus_endpoint_fd, ep_uid, context->bus_endpoint); |
1485 | if (r < 0) { | |
1486 | *exit_status = EXIT_BUS_ENDPOINT; | |
1487 | return r; | |
e44da745 DM |
1488 | } |
1489 | } | |
1490 | #endif | |
1491 | ||
a931ad47 LP |
1492 | /* If delegation is enabled we'll pass ownership of the cgroup |
1493 | * (but only in systemd's own controller hierarchy!) to the | |
1494 | * user of the new process. */ | |
1495 | if (params->cgroup_path && context->user && params->cgroup_delegate) { | |
ff0af2a1 LP |
1496 | r = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0644, uid, gid); |
1497 | if (r < 0) { | |
1498 | *exit_status = EXIT_CGROUP; | |
1499 | return r; | |
d35fbf6b | 1500 | } |
034c6ed7 | 1501 | |
034c6ed7 | 1502 | |
ff0af2a1 LP |
1503 | r = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0755, uid, gid); |
1504 | if (r < 0) { | |
1505 | *exit_status = EXIT_CGROUP; | |
1506 | return r; | |
034c6ed7 | 1507 | } |
d35fbf6b | 1508 | } |
034c6ed7 | 1509 | |
d35fbf6b DM |
1510 | if (!strv_isempty(context->runtime_directory) && params->runtime_prefix) { |
1511 | char **rt; | |
fb33a393 | 1512 | |
d35fbf6b DM |
1513 | STRV_FOREACH(rt, context->runtime_directory) { |
1514 | _cleanup_free_ char *p; | |
94f04347 | 1515 | |
d35fbf6b DM |
1516 | p = strjoin(params->runtime_prefix, "/", *rt, NULL); |
1517 | if (!p) { | |
ff0af2a1 | 1518 | *exit_status = EXIT_RUNTIME_DIRECTORY; |
d35fbf6b | 1519 | return -ENOMEM; |
94f04347 | 1520 | } |
94f04347 | 1521 | |
ca905b2f | 1522 | r = mkdir_safe_label(p, context->runtime_directory_mode, uid, gid); |
ff0af2a1 LP |
1523 | if (r < 0) { |
1524 | *exit_status = EXIT_RUNTIME_DIRECTORY; | |
1525 | return r; | |
94f04347 | 1526 | } |
d35fbf6b DM |
1527 | } |
1528 | } | |
94f04347 | 1529 | |
d35fbf6b | 1530 | if (params->apply_permissions) { |
ff0af2a1 LP |
1531 | r = enforce_groups(context, username, gid); |
1532 | if (r < 0) { | |
1533 | *exit_status = EXIT_GROUP; | |
1534 | return r; | |
d35fbf6b DM |
1535 | } |
1536 | } | |
9eba9da4 | 1537 | |
d35fbf6b | 1538 | umask(context->umask); |
94f04347 | 1539 | |
d35fbf6b DM |
1540 | #ifdef HAVE_PAM |
1541 | if (params->apply_permissions && context->pam_name && username) { | |
ff0af2a1 LP |
1542 | r = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds); |
1543 | if (r < 0) { | |
1544 | *exit_status = EXIT_PAM; | |
1545 | return r; | |
d35fbf6b DM |
1546 | } |
1547 | } | |
1548 | #endif | |
ac45f971 | 1549 | |
d35fbf6b | 1550 | if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) { |
ff0af2a1 LP |
1551 | r = setup_netns(runtime->netns_storage_socket); |
1552 | if (r < 0) { | |
1553 | *exit_status = EXIT_NETWORK; | |
1554 | return r; | |
d35fbf6b DM |
1555 | } |
1556 | } | |
169c1bda | 1557 | |
d35fbf6b DM |
1558 | if (!strv_isempty(context->read_write_dirs) || |
1559 | !strv_isempty(context->read_only_dirs) || | |
1560 | !strv_isempty(context->inaccessible_dirs) || | |
1561 | context->mount_flags != 0 || | |
1562 | (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) || | |
e44da745 | 1563 | params->bus_endpoint_path || |
d35fbf6b DM |
1564 | context->private_devices || |
1565 | context->protect_system != PROTECT_SYSTEM_NO || | |
1566 | context->protect_home != PROTECT_HOME_NO) { | |
1567 | ||
1568 | char *tmp = NULL, *var = NULL; | |
1569 | ||
1570 | /* The runtime struct only contains the parent | |
1571 | * of the private /tmp, which is | |
1572 | * non-accessible to world users. Inside of it | |
1573 | * there's a /tmp that is sticky, and that's | |
1574 | * the one we want to use here. */ | |
1575 | ||
1576 | if (context->private_tmp && runtime) { | |
1577 | if (runtime->tmp_dir) | |
63c372cb | 1578 | tmp = strjoina(runtime->tmp_dir, "/tmp"); |
d35fbf6b | 1579 | if (runtime->var_tmp_dir) |
63c372cb | 1580 | var = strjoina(runtime->var_tmp_dir, "/tmp"); |
d35fbf6b | 1581 | } |
d8b4e2e9 | 1582 | |
ff0af2a1 | 1583 | r = setup_namespace( |
d35fbf6b DM |
1584 | context->read_write_dirs, |
1585 | context->read_only_dirs, | |
1586 | context->inaccessible_dirs, | |
1587 | tmp, | |
1588 | var, | |
e44da745 | 1589 | params->bus_endpoint_path, |
d35fbf6b DM |
1590 | context->private_devices, |
1591 | context->protect_home, | |
1592 | context->protect_system, | |
1593 | context->mount_flags); | |
0015ebf3 | 1594 | |
ff0af2a1 LP |
1595 | /* If we couldn't set up the namespace this is |
1596 | * probably due to a missing capability. In this case, | |
1597 | * silently proceeed. */ | |
1598 | if (r == -EPERM || r == -EACCES) { | |
1599 | log_open(); | |
f2341e0a | 1600 | log_unit_debug_errno(unit, r, "Failed to set up namespace, assuming containerized execution, ignoring: %m"); |
ff0af2a1 LP |
1601 | log_close(); |
1602 | } else if (r < 0) { | |
1603 | *exit_status = EXIT_NAMESPACE; | |
1604 | return r; | |
81a2b7ce | 1605 | } |
d35fbf6b | 1606 | } |
81a2b7ce | 1607 | |
d35fbf6b DM |
1608 | if (params->apply_chroot) { |
1609 | if (context->root_directory) | |
1610 | if (chroot(context->root_directory) < 0) { | |
ff0af2a1 | 1611 | *exit_status = EXIT_CHROOT; |
d35fbf6b | 1612 | return -errno; |
8aa75193 LP |
1613 | } |
1614 | ||
4c08c824 LP |
1615 | if (chdir(context->working_directory ?: "/") < 0 && |
1616 | !context->working_directory_missing_ok) { | |
ff0af2a1 | 1617 | *exit_status = EXIT_CHDIR; |
d35fbf6b DM |
1618 | return -errno; |
1619 | } | |
1620 | } else { | |
1621 | _cleanup_free_ char *d = NULL; | |
8aa75193 | 1622 | |
d35fbf6b | 1623 | if (asprintf(&d, "%s/%s", |
cf1d0302 LP |
1624 | context->root_directory ?: "", |
1625 | context->working_directory ?: "") < 0) { | |
ff0af2a1 | 1626 | *exit_status = EXIT_MEMORY; |
d35fbf6b | 1627 | return -ENOMEM; |
8aa75193 | 1628 | } |
8aa75193 | 1629 | |
cf1d0302 LP |
1630 | if (chdir(d) < 0 && |
1631 | !context->working_directory_missing_ok) { | |
ff0af2a1 | 1632 | *exit_status = EXIT_CHDIR; |
d35fbf6b DM |
1633 | return -errno; |
1634 | } | |
1635 | } | |
e66cf1a3 | 1636 | |
9008e1ac MS |
1637 | #ifdef HAVE_SELINUX |
1638 | if (params->apply_permissions && mac_selinux_use() && params->selinux_context_net && socket_fd >= 0) { | |
ff0af2a1 LP |
1639 | r = mac_selinux_get_child_mls_label(socket_fd, command->path, context->selinux_context, &mac_selinux_context_net); |
1640 | if (r < 0) { | |
1641 | *exit_status = EXIT_SELINUX_CONTEXT; | |
1642 | return r; | |
9008e1ac MS |
1643 | } |
1644 | } | |
1645 | #endif | |
1646 | ||
d35fbf6b DM |
1647 | /* We repeat the fd closing here, to make sure that |
1648 | * nothing is leaked from the PAM modules. Note that | |
1649 | * we are more aggressive this time since socket_fd | |
e44da745 DM |
1650 | * and the netns fds we don't need anymore. The custom |
1651 | * endpoint fd was needed to upload the policy and can | |
1652 | * now be closed as well. */ | |
ff0af2a1 LP |
1653 | r = close_all_fds(fds, n_fds); |
1654 | if (r >= 0) | |
1655 | r = shift_fds(fds, n_fds); | |
1656 | if (r >= 0) | |
1657 | r = flags_fds(fds, n_fds, context->non_blocking); | |
1658 | if (r < 0) { | |
1659 | *exit_status = EXIT_FDS; | |
1660 | return r; | |
d35fbf6b | 1661 | } |
e66cf1a3 | 1662 | |
d35fbf6b | 1663 | if (params->apply_permissions) { |
e66cf1a3 | 1664 | |
d35fbf6b DM |
1665 | for (i = 0; i < _RLIMIT_MAX; i++) { |
1666 | if (!context->rlimit[i]) | |
1667 | continue; | |
1668 | ||
1669 | if (setrlimit_closest(i, context->rlimit[i]) < 0) { | |
ff0af2a1 | 1670 | *exit_status = EXIT_LIMITS; |
d35fbf6b | 1671 | return -errno; |
e66cf1a3 LP |
1672 | } |
1673 | } | |
1674 | ||
d35fbf6b | 1675 | if (context->capability_bounding_set_drop) { |
ff0af2a1 LP |
1676 | r = capability_bounding_set_drop(context->capability_bounding_set_drop, false); |
1677 | if (r < 0) { | |
1678 | *exit_status = EXIT_CAPABILITIES; | |
1679 | return r; | |
3b8bddde | 1680 | } |
4c2630eb | 1681 | } |
3b8bddde | 1682 | |
2ca620c4 WC |
1683 | #ifdef HAVE_SMACK |
1684 | if (context->smack_process_label) { | |
ff0af2a1 LP |
1685 | r = mac_smack_apply_pid(0, context->smack_process_label); |
1686 | if (r < 0) { | |
1687 | *exit_status = EXIT_SMACK_PROCESS_LABEL; | |
1688 | return r; | |
2ca620c4 WC |
1689 | } |
1690 | } | |
1691 | #endif | |
1692 | ||
d35fbf6b | 1693 | if (context->user) { |
ff0af2a1 LP |
1694 | r = enforce_user(context, uid); |
1695 | if (r < 0) { | |
1696 | *exit_status = EXIT_USER; | |
1697 | return r; | |
5b6319dc LP |
1698 | } |
1699 | } | |
d35fbf6b DM |
1700 | |
1701 | /* PR_GET_SECUREBITS is not privileged, while | |
1702 | * PR_SET_SECUREBITS is. So to suppress | |
1703 | * potential EPERMs we'll try not to call | |
1704 | * PR_SET_SECUREBITS unless necessary. */ | |
1705 | if (prctl(PR_GET_SECUREBITS) != context->secure_bits) | |
1706 | if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) { | |
ff0af2a1 | 1707 | *exit_status = EXIT_SECUREBITS; |
d35fbf6b | 1708 | return -errno; |
ff01d048 | 1709 | } |
5b6319dc | 1710 | |
d35fbf6b DM |
1711 | if (context->capabilities) |
1712 | if (cap_set_proc(context->capabilities) < 0) { | |
ff0af2a1 | 1713 | *exit_status = EXIT_CAPABILITIES; |
d35fbf6b | 1714 | return -errno; |
613b411c LP |
1715 | } |
1716 | ||
d35fbf6b DM |
1717 | if (context->no_new_privileges) |
1718 | if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) { | |
ff0af2a1 | 1719 | *exit_status = EXIT_NO_NEW_PRIVILEGES; |
d35fbf6b DM |
1720 | return -errno; |
1721 | } | |
1722 | ||
1723 | #ifdef HAVE_SECCOMP | |
1724 | if (context->address_families_whitelist || | |
1725 | !set_isempty(context->address_families)) { | |
ff0af2a1 LP |
1726 | r = apply_address_families(context); |
1727 | if (r < 0) { | |
1728 | *exit_status = EXIT_ADDRESS_FAMILIES; | |
1729 | return r; | |
4c2630eb MS |
1730 | } |
1731 | } | |
04aa0cb9 | 1732 | |
d35fbf6b DM |
1733 | if (context->syscall_whitelist || |
1734 | !set_isempty(context->syscall_filter) || | |
1735 | !set_isempty(context->syscall_archs)) { | |
ff0af2a1 LP |
1736 | r = apply_seccomp(context); |
1737 | if (r < 0) { | |
1738 | *exit_status = EXIT_SECCOMP; | |
1739 | return r; | |
81a2b7ce | 1740 | } |
d35fbf6b DM |
1741 | } |
1742 | #endif | |
81a2b7ce | 1743 | |
d35fbf6b | 1744 | #ifdef HAVE_SELINUX |
6baa7db0 | 1745 | if (mac_selinux_use()) { |
9008e1ac | 1746 | char *exec_context = mac_selinux_context_net ?: context->selinux_context; |
16115b0a | 1747 | |
9008e1ac | 1748 | if (exec_context) { |
ff0af2a1 LP |
1749 | r = setexeccon(exec_context); |
1750 | if (r < 0) { | |
1751 | *exit_status = EXIT_SELINUX_CONTEXT; | |
1752 | return r; | |
16115b0a | 1753 | } |
81a2b7ce | 1754 | } |
81a2b7ce | 1755 | } |
d35fbf6b | 1756 | #endif |
81a2b7ce | 1757 | |
d35fbf6b | 1758 | #ifdef HAVE_APPARMOR |
6baa7db0 | 1759 | if (context->apparmor_profile && mac_apparmor_use()) { |
ff0af2a1 LP |
1760 | r = aa_change_onexec(context->apparmor_profile); |
1761 | if (r < 0 && !context->apparmor_profile_ignore) { | |
1762 | *exit_status = EXIT_APPARMOR_PROFILE; | |
5482192e | 1763 | return -errno; |
d35fbf6b | 1764 | } |
034c6ed7 | 1765 | } |
d35fbf6b DM |
1766 | #endif |
1767 | } | |
034c6ed7 | 1768 | |
ff0af2a1 LP |
1769 | r = build_environment(context, n_fds, params->watchdog_usec, home, username, shell, &our_env); |
1770 | if (r < 0) { | |
1771 | *exit_status = EXIT_MEMORY; | |
1772 | return r; | |
d35fbf6b | 1773 | } |
034c6ed7 | 1774 | |
d35fbf6b DM |
1775 | final_env = strv_env_merge(5, |
1776 | params->environment, | |
1777 | our_env, | |
1778 | context->environment, | |
1779 | files_env, | |
1780 | pam_env, | |
1781 | NULL); | |
1782 | if (!final_env) { | |
ff0af2a1 | 1783 | *exit_status = EXIT_MEMORY; |
d35fbf6b DM |
1784 | return -ENOMEM; |
1785 | } | |
81a2b7ce | 1786 | |
d35fbf6b DM |
1787 | final_argv = replace_env_argv(argv, final_env); |
1788 | if (!final_argv) { | |
ff0af2a1 | 1789 | *exit_status = EXIT_MEMORY; |
d35fbf6b DM |
1790 | return -ENOMEM; |
1791 | } | |
034c6ed7 | 1792 | |
d35fbf6b | 1793 | final_env = strv_env_clean(final_env); |
260abb78 | 1794 | |
553d2243 | 1795 | if (_unlikely_(log_get_max_level() >= LOG_DEBUG)) { |
d35fbf6b | 1796 | _cleanup_free_ char *line; |
81a2b7ce | 1797 | |
d35fbf6b DM |
1798 | line = exec_command_line(final_argv); |
1799 | if (line) { | |
1800 | log_open(); | |
f2341e0a LP |
1801 | log_struct(LOG_DEBUG, |
1802 | LOG_UNIT_ID(unit), | |
1803 | "EXECUTABLE=%s", command->path, | |
1804 | LOG_UNIT_MESSAGE(unit, "Executing: %s", line), | |
1805 | NULL); | |
d35fbf6b DM |
1806 | log_close(); |
1807 | } | |
1808 | } | |
dd305ec9 | 1809 | |
d35fbf6b | 1810 | execve(command->path, final_argv, final_env); |
ff0af2a1 | 1811 | *exit_status = EXIT_EXEC; |
d35fbf6b DM |
1812 | return -errno; |
1813 | } | |
81a2b7ce | 1814 | |
f2341e0a LP |
1815 | int exec_spawn(Unit *unit, |
1816 | ExecCommand *command, | |
d35fbf6b DM |
1817 | const ExecContext *context, |
1818 | const ExecParameters *params, | |
1819 | ExecRuntime *runtime, | |
1820 | pid_t *ret) { | |
8351ceae | 1821 | |
d35fbf6b DM |
1822 | _cleanup_strv_free_ char **files_env = NULL; |
1823 | int *fds = NULL; unsigned n_fds = 0; | |
ff0af2a1 LP |
1824 | _cleanup_free_ char *line = NULL; |
1825 | int socket_fd, r; | |
1826 | char **argv; | |
d35fbf6b | 1827 | pid_t pid; |
8351ceae | 1828 | |
f2341e0a | 1829 | assert(unit); |
d35fbf6b DM |
1830 | assert(command); |
1831 | assert(context); | |
1832 | assert(ret); | |
1833 | assert(params); | |
1834 | assert(params->fds || params->n_fds <= 0); | |
4298d0b5 | 1835 | |
d35fbf6b DM |
1836 | if (context->std_input == EXEC_INPUT_SOCKET || |
1837 | context->std_output == EXEC_OUTPUT_SOCKET || | |
1838 | context->std_error == EXEC_OUTPUT_SOCKET) { | |
17df7223 | 1839 | |
ff0af2a1 | 1840 | if (params->n_fds != 1) { |
f2341e0a | 1841 | log_unit_error(unit, "Got more than one socket."); |
d35fbf6b | 1842 | return -EINVAL; |
ff0af2a1 | 1843 | } |
eef65bf3 | 1844 | |
d35fbf6b DM |
1845 | socket_fd = params->fds[0]; |
1846 | } else { | |
1847 | socket_fd = -1; | |
1848 | fds = params->fds; | |
1849 | n_fds = params->n_fds; | |
1850 | } | |
94f04347 | 1851 | |
f2341e0a | 1852 | r = exec_context_load_environment(unit, context, &files_env); |
ff0af2a1 | 1853 | if (r < 0) |
f2341e0a | 1854 | return log_unit_error_errno(unit, r, "Failed to load environment files: %m"); |
034c6ed7 | 1855 | |
d35fbf6b | 1856 | argv = params->argv ?: command->argv; |
d35fbf6b DM |
1857 | line = exec_command_line(argv); |
1858 | if (!line) | |
1859 | return log_oom(); | |
fab56fc5 | 1860 | |
f2341e0a LP |
1861 | log_struct(LOG_DEBUG, |
1862 | LOG_UNIT_ID(unit), | |
1863 | LOG_UNIT_MESSAGE(unit, "About to execute: %s", line), | |
1864 | "EXECUTABLE=%s", command->path, | |
1865 | NULL); | |
d35fbf6b DM |
1866 | pid = fork(); |
1867 | if (pid < 0) | |
f2341e0a | 1868 | return log_unit_error_errno(unit, r, "Failed to fork: %m"); |
d35fbf6b DM |
1869 | |
1870 | if (pid == 0) { | |
ff0af2a1 LP |
1871 | int exit_status; |
1872 | ||
f2341e0a LP |
1873 | r = exec_child(unit, |
1874 | command, | |
ff0af2a1 LP |
1875 | context, |
1876 | params, | |
1877 | runtime, | |
1878 | argv, | |
1879 | socket_fd, | |
1880 | fds, n_fds, | |
1881 | files_env, | |
1882 | &exit_status); | |
1883 | if (r < 0) { | |
4c2630eb | 1884 | log_open(); |
f2341e0a LP |
1885 | log_struct_errno(LOG_ERR, r, |
1886 | LOG_MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED), | |
1887 | LOG_UNIT_ID(unit), | |
1888 | LOG_UNIT_MESSAGE(unit, "Failed at step %s spawning %s: %m", | |
1889 | exit_status_to_string(exit_status, EXIT_STATUS_SYSTEMD), | |
1890 | command->path), | |
1891 | "EXECUTABLE=%s", command->path, | |
1892 | NULL); | |
4c2630eb MS |
1893 | } |
1894 | ||
ff0af2a1 | 1895 | _exit(exit_status); |
034c6ed7 LP |
1896 | } |
1897 | ||
f2341e0a | 1898 | log_unit_debug(unit, "Forked %s as "PID_FMT, command->path, pid); |
23635a85 | 1899 | |
80876c20 LP |
1900 | /* We add the new process to the cgroup both in the child (so |
1901 | * that we can be sure that no user code is ever executed | |
1902 | * outside of the cgroup) and in the parent (so that we can be | |
1903 | * sure that when we kill the cgroup the process will be | |
1904 | * killed too). */ | |
d35fbf6b | 1905 | if (params->cgroup_path) |
dd305ec9 | 1906 | (void) cg_attach(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, pid); |
2da3263a | 1907 | |
b58b4116 | 1908 | exec_status_start(&command->exec_status, pid); |
9fb86720 | 1909 | |
034c6ed7 | 1910 | *ret = pid; |
5cb5a6ff LP |
1911 | return 0; |
1912 | } | |
1913 | ||
034c6ed7 LP |
1914 | void exec_context_init(ExecContext *c) { |
1915 | assert(c); | |
1916 | ||
4c12626c | 1917 | c->umask = 0022; |
9eba9da4 | 1918 | c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0); |
94f04347 | 1919 | c->cpu_sched_policy = SCHED_OTHER; |
071830ff | 1920 | c->syslog_priority = LOG_DAEMON|LOG_INFO; |
74922904 | 1921 | c->syslog_level_prefix = true; |
353e12c2 | 1922 | c->ignore_sigpipe = true; |
3a43da28 | 1923 | c->timer_slack_nsec = NSEC_INFINITY; |
ac45f971 | 1924 | c->personality = 0xffffffffUL; |
e66cf1a3 | 1925 | c->runtime_directory_mode = 0755; |
034c6ed7 LP |
1926 | } |
1927 | ||
613b411c | 1928 | void exec_context_done(ExecContext *c) { |
5cb5a6ff LP |
1929 | unsigned l; |
1930 | ||
1931 | assert(c); | |
1932 | ||
1933 | strv_free(c->environment); | |
034c6ed7 | 1934 | c->environment = NULL; |
5cb5a6ff | 1935 | |
8c7be95e LP |
1936 | strv_free(c->environment_files); |
1937 | c->environment_files = NULL; | |
1938 | ||
034c6ed7 | 1939 | for (l = 0; l < ELEMENTSOF(c->rlimit); l++) { |
5cb5a6ff | 1940 | free(c->rlimit[l]); |
034c6ed7 LP |
1941 | c->rlimit[l] = NULL; |
1942 | } | |
1943 | ||
9eba9da4 LP |
1944 | free(c->working_directory); |
1945 | c->working_directory = NULL; | |
1946 | free(c->root_directory); | |
1947 | c->root_directory = NULL; | |
5cb5a6ff | 1948 | |
80876c20 LP |
1949 | free(c->tty_path); |
1950 | c->tty_path = NULL; | |
1951 | ||
071830ff LP |
1952 | free(c->syslog_identifier); |
1953 | c->syslog_identifier = NULL; | |
1954 | ||
5cb5a6ff | 1955 | free(c->user); |
034c6ed7 LP |
1956 | c->user = NULL; |
1957 | ||
5cb5a6ff | 1958 | free(c->group); |
034c6ed7 LP |
1959 | c->group = NULL; |
1960 | ||
1961 | strv_free(c->supplementary_groups); | |
1962 | c->supplementary_groups = NULL; | |
94f04347 | 1963 | |
5b6319dc LP |
1964 | free(c->pam_name); |
1965 | c->pam_name = NULL; | |
1966 | ||
94f04347 LP |
1967 | if (c->capabilities) { |
1968 | cap_free(c->capabilities); | |
1969 | c->capabilities = NULL; | |
1970 | } | |
15ae422b LP |
1971 | |
1972 | strv_free(c->read_only_dirs); | |
1973 | c->read_only_dirs = NULL; | |
1974 | ||
1975 | strv_free(c->read_write_dirs); | |
1976 | c->read_write_dirs = NULL; | |
1977 | ||
1978 | strv_free(c->inaccessible_dirs); | |
1979 | c->inaccessible_dirs = NULL; | |
82c121a4 LP |
1980 | |
1981 | if (c->cpuset) | |
1982 | CPU_FREE(c->cpuset); | |
86a3475b LP |
1983 | |
1984 | free(c->utmp_id); | |
1985 | c->utmp_id = NULL; | |
b9a0e010 | 1986 | |
7b52a628 MS |
1987 | free(c->selinux_context); |
1988 | c->selinux_context = NULL; | |
1989 | ||
eef65bf3 MS |
1990 | free(c->apparmor_profile); |
1991 | c->apparmor_profile = NULL; | |
1992 | ||
17df7223 LP |
1993 | set_free(c->syscall_filter); |
1994 | c->syscall_filter = NULL; | |
57183d11 LP |
1995 | |
1996 | set_free(c->syscall_archs); | |
1997 | c->syscall_archs = NULL; | |
4298d0b5 LP |
1998 | |
1999 | set_free(c->address_families); | |
2000 | c->address_families = NULL; | |
e66cf1a3 LP |
2001 | |
2002 | strv_free(c->runtime_directory); | |
2003 | c->runtime_directory = NULL; | |
bb7dd0b0 DM |
2004 | |
2005 | bus_endpoint_free(c->bus_endpoint); | |
2006 | c->bus_endpoint = NULL; | |
e66cf1a3 LP |
2007 | } |
2008 | ||
2009 | int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) { | |
2010 | char **i; | |
2011 | ||
2012 | assert(c); | |
2013 | ||
2014 | if (!runtime_prefix) | |
2015 | return 0; | |
2016 | ||
2017 | STRV_FOREACH(i, c->runtime_directory) { | |
2018 | _cleanup_free_ char *p; | |
2019 | ||
2020 | p = strjoin(runtime_prefix, "/", *i, NULL); | |
2021 | if (!p) | |
2022 | return -ENOMEM; | |
2023 | ||
2024 | /* We execute this synchronously, since we need to be | |
2025 | * sure this is gone when we start the service | |
2026 | * next. */ | |
c6878637 | 2027 | (void) rm_rf(p, REMOVE_ROOT); |
e66cf1a3 LP |
2028 | } |
2029 | ||
2030 | return 0; | |
5cb5a6ff LP |
2031 | } |
2032 | ||
43d0fcbd LP |
2033 | void exec_command_done(ExecCommand *c) { |
2034 | assert(c); | |
2035 | ||
2036 | free(c->path); | |
2037 | c->path = NULL; | |
2038 | ||
2039 | strv_free(c->argv); | |
2040 | c->argv = NULL; | |
2041 | } | |
2042 | ||
2043 | void exec_command_done_array(ExecCommand *c, unsigned n) { | |
2044 | unsigned i; | |
2045 | ||
2046 | for (i = 0; i < n; i++) | |
2047 | exec_command_done(c+i); | |
2048 | } | |
2049 | ||
f1acf85a | 2050 | ExecCommand* exec_command_free_list(ExecCommand *c) { |
5cb5a6ff LP |
2051 | ExecCommand *i; |
2052 | ||
2053 | while ((i = c)) { | |
71fda00f | 2054 | LIST_REMOVE(command, c, i); |
43d0fcbd | 2055 | exec_command_done(i); |
5cb5a6ff LP |
2056 | free(i); |
2057 | } | |
f1acf85a ZJS |
2058 | |
2059 | return NULL; | |
5cb5a6ff LP |
2060 | } |
2061 | ||
034c6ed7 LP |
2062 | void exec_command_free_array(ExecCommand **c, unsigned n) { |
2063 | unsigned i; | |
2064 | ||
f1acf85a ZJS |
2065 | for (i = 0; i < n; i++) |
2066 | c[i] = exec_command_free_list(c[i]); | |
034c6ed7 LP |
2067 | } |
2068 | ||
039f0e70 | 2069 | typedef struct InvalidEnvInfo { |
f2341e0a | 2070 | Unit *unit; |
039f0e70 LP |
2071 | const char *path; |
2072 | } InvalidEnvInfo; | |
2073 | ||
2074 | static void invalid_env(const char *p, void *userdata) { | |
2075 | InvalidEnvInfo *info = userdata; | |
2076 | ||
f2341e0a | 2077 | log_unit_error(info->unit, "Ignoring invalid environment assignment '%s': %s", p, info->path); |
039f0e70 LP |
2078 | } |
2079 | ||
f2341e0a | 2080 | int exec_context_load_environment(Unit *unit, const ExecContext *c, char ***l) { |
8c7be95e LP |
2081 | char **i, **r = NULL; |
2082 | ||
2083 | assert(c); | |
2084 | assert(l); | |
2085 | ||
2086 | STRV_FOREACH(i, c->environment_files) { | |
2087 | char *fn; | |
2088 | int k; | |
2089 | bool ignore = false; | |
2090 | char **p; | |
7fd1b19b | 2091 | _cleanup_globfree_ glob_t pglob = {}; |
2bef10ab | 2092 | int count, n; |
8c7be95e LP |
2093 | |
2094 | fn = *i; | |
2095 | ||
2096 | if (fn[0] == '-') { | |
2097 | ignore = true; | |
2098 | fn ++; | |
2099 | } | |
2100 | ||
2101 | if (!path_is_absolute(fn)) { | |
8c7be95e LP |
2102 | if (ignore) |
2103 | continue; | |
2104 | ||
2105 | strv_free(r); | |
2106 | return -EINVAL; | |
2107 | } | |
2108 | ||
2bef10ab | 2109 | /* Filename supports globbing, take all matching files */ |
2bef10ab PL |
2110 | errno = 0; |
2111 | if (glob(fn, 0, NULL, &pglob) != 0) { | |
2bef10ab PL |
2112 | if (ignore) |
2113 | continue; | |
8c7be95e | 2114 | |
2bef10ab PL |
2115 | strv_free(r); |
2116 | return errno ? -errno : -EINVAL; | |
2117 | } | |
2118 | count = pglob.gl_pathc; | |
2119 | if (count == 0) { | |
8c7be95e LP |
2120 | if (ignore) |
2121 | continue; | |
2122 | ||
2123 | strv_free(r); | |
2bef10ab | 2124 | return -EINVAL; |
8c7be95e | 2125 | } |
2bef10ab | 2126 | for (n = 0; n < count; n++) { |
717603e3 | 2127 | k = load_env_file(NULL, pglob.gl_pathv[n], NULL, &p); |
2bef10ab PL |
2128 | if (k < 0) { |
2129 | if (ignore) | |
2130 | continue; | |
8c7be95e | 2131 | |
2bef10ab | 2132 | strv_free(r); |
2bef10ab | 2133 | return k; |
e9c1ea9d | 2134 | } |
ebc05a09 | 2135 | /* Log invalid environment variables with filename */ |
039f0e70 LP |
2136 | if (p) { |
2137 | InvalidEnvInfo info = { | |
f2341e0a | 2138 | .unit = unit, |
039f0e70 LP |
2139 | .path = pglob.gl_pathv[n] |
2140 | }; | |
2141 | ||
2142 | p = strv_env_clean_with_callback(p, invalid_env, &info); | |
2143 | } | |
8c7be95e | 2144 | |
2bef10ab PL |
2145 | if (r == NULL) |
2146 | r = p; | |
2147 | else { | |
2148 | char **m; | |
8c7be95e | 2149 | |
2bef10ab PL |
2150 | m = strv_env_merge(2, r, p); |
2151 | strv_free(r); | |
2152 | strv_free(p); | |
c84a9488 | 2153 | if (!m) |
2bef10ab | 2154 | return -ENOMEM; |
2bef10ab PL |
2155 | |
2156 | r = m; | |
2157 | } | |
8c7be95e LP |
2158 | } |
2159 | } | |
2160 | ||
2161 | *l = r; | |
2162 | ||
2163 | return 0; | |
2164 | } | |
2165 | ||
6ac8fdc9 | 2166 | static bool tty_may_match_dev_console(const char *tty) { |
e1d75803 RC |
2167 | _cleanup_free_ char *active = NULL; |
2168 | char *console; | |
6ac8fdc9 MS |
2169 | |
2170 | if (startswith(tty, "/dev/")) | |
2171 | tty += 5; | |
2172 | ||
2173 | /* trivial identity? */ | |
2174 | if (streq(tty, "console")) | |
2175 | return true; | |
2176 | ||
2177 | console = resolve_dev_console(&active); | |
2178 | /* if we could not resolve, assume it may */ | |
2179 | if (!console) | |
2180 | return true; | |
2181 | ||
2182 | /* "tty0" means the active VC, so it may be the same sometimes */ | |
e1d75803 | 2183 | return streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty)); |
6ac8fdc9 MS |
2184 | } |
2185 | ||
2186 | bool exec_context_may_touch_console(ExecContext *ec) { | |
2187 | return (ec->tty_reset || ec->tty_vhangup || ec->tty_vt_disallocate || | |
2188 | is_terminal_input(ec->std_input) || | |
2189 | is_terminal_output(ec->std_output) || | |
2190 | is_terminal_output(ec->std_error)) && | |
2191 | tty_may_match_dev_console(tty_path(ec)); | |
2192 | } | |
2193 | ||
15ae422b LP |
2194 | static void strv_fprintf(FILE *f, char **l) { |
2195 | char **g; | |
2196 | ||
2197 | assert(f); | |
2198 | ||
2199 | STRV_FOREACH(g, l) | |
2200 | fprintf(f, " %s", *g); | |
2201 | } | |
2202 | ||
5cb5a6ff | 2203 | void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { |
507f22bd | 2204 | char **e; |
94f04347 | 2205 | unsigned i; |
9eba9da4 | 2206 | |
5cb5a6ff LP |
2207 | assert(c); |
2208 | assert(f); | |
2209 | ||
4ad49000 | 2210 | prefix = strempty(prefix); |
5cb5a6ff LP |
2211 | |
2212 | fprintf(f, | |
94f04347 LP |
2213 | "%sUMask: %04o\n" |
2214 | "%sWorkingDirectory: %s\n" | |
451a074f | 2215 | "%sRootDirectory: %s\n" |
15ae422b | 2216 | "%sNonBlocking: %s\n" |
64747e2d | 2217 | "%sPrivateTmp: %s\n" |
4819ff03 | 2218 | "%sPrivateNetwork: %s\n" |
7f112f50 | 2219 | "%sPrivateDevices: %s\n" |
1b8689f9 LP |
2220 | "%sProtectHome: %s\n" |
2221 | "%sProtectSystem: %s\n" | |
3bb07b76 | 2222 | "%sIgnoreSIGPIPE: %s\n", |
5cb5a6ff | 2223 | prefix, c->umask, |
9eba9da4 | 2224 | prefix, c->working_directory ? c->working_directory : "/", |
451a074f | 2225 | prefix, c->root_directory ? c->root_directory : "/", |
15ae422b | 2226 | prefix, yes_no(c->non_blocking), |
64747e2d | 2227 | prefix, yes_no(c->private_tmp), |
4819ff03 | 2228 | prefix, yes_no(c->private_network), |
7f112f50 | 2229 | prefix, yes_no(c->private_devices), |
1b8689f9 LP |
2230 | prefix, protect_home_to_string(c->protect_home), |
2231 | prefix, protect_system_to_string(c->protect_system), | |
3bb07b76 | 2232 | prefix, yes_no(c->ignore_sigpipe)); |
fb33a393 | 2233 | |
8c7be95e LP |
2234 | STRV_FOREACH(e, c->environment) |
2235 | fprintf(f, "%sEnvironment: %s\n", prefix, *e); | |
2236 | ||
2237 | STRV_FOREACH(e, c->environment_files) | |
2238 | fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e); | |
94f04347 | 2239 | |
fb33a393 LP |
2240 | if (c->nice_set) |
2241 | fprintf(f, | |
2242 | "%sNice: %i\n", | |
2243 | prefix, c->nice); | |
2244 | ||
dd6c17b1 | 2245 | if (c->oom_score_adjust_set) |
fb33a393 | 2246 | fprintf(f, |
dd6c17b1 LP |
2247 | "%sOOMScoreAdjust: %i\n", |
2248 | prefix, c->oom_score_adjust); | |
9eba9da4 | 2249 | |
94f04347 LP |
2250 | for (i = 0; i < RLIM_NLIMITS; i++) |
2251 | if (c->rlimit[i]) | |
de0671ee ZJS |
2252 | fprintf(f, "%s%s: "RLIM_FMT"\n", |
2253 | prefix, rlimit_to_string(i), c->rlimit[i]->rlim_max); | |
94f04347 | 2254 | |
f8b69d1d | 2255 | if (c->ioprio_set) { |
1756a011 | 2256 | _cleanup_free_ char *class_str = NULL; |
f8b69d1d | 2257 | |
1756a011 | 2258 | ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str); |
9eba9da4 LP |
2259 | fprintf(f, |
2260 | "%sIOSchedulingClass: %s\n" | |
2261 | "%sIOPriority: %i\n", | |
f8b69d1d | 2262 | prefix, strna(class_str), |
9eba9da4 | 2263 | prefix, (int) IOPRIO_PRIO_DATA(c->ioprio)); |
f8b69d1d | 2264 | } |
94f04347 | 2265 | |
f8b69d1d | 2266 | if (c->cpu_sched_set) { |
1756a011 | 2267 | _cleanup_free_ char *policy_str = NULL; |
f8b69d1d | 2268 | |
1756a011 | 2269 | sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str); |
94f04347 LP |
2270 | fprintf(f, |
2271 | "%sCPUSchedulingPolicy: %s\n" | |
38b48754 LP |
2272 | "%sCPUSchedulingPriority: %i\n" |
2273 | "%sCPUSchedulingResetOnFork: %s\n", | |
f8b69d1d | 2274 | prefix, strna(policy_str), |
38b48754 LP |
2275 | prefix, c->cpu_sched_priority, |
2276 | prefix, yes_no(c->cpu_sched_reset_on_fork)); | |
b929bf04 | 2277 | } |
94f04347 | 2278 | |
82c121a4 | 2279 | if (c->cpuset) { |
94f04347 | 2280 | fprintf(f, "%sCPUAffinity:", prefix); |
82c121a4 LP |
2281 | for (i = 0; i < c->cpuset_ncpus; i++) |
2282 | if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset)) | |
43a99a7a | 2283 | fprintf(f, " %u", i); |
94f04347 LP |
2284 | fputs("\n", f); |
2285 | } | |
2286 | ||
3a43da28 | 2287 | if (c->timer_slack_nsec != NSEC_INFINITY) |
ccd06097 | 2288 | fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec); |
94f04347 LP |
2289 | |
2290 | fprintf(f, | |
80876c20 LP |
2291 | "%sStandardInput: %s\n" |
2292 | "%sStandardOutput: %s\n" | |
2293 | "%sStandardError: %s\n", | |
2294 | prefix, exec_input_to_string(c->std_input), | |
2295 | prefix, exec_output_to_string(c->std_output), | |
2296 | prefix, exec_output_to_string(c->std_error)); | |
2297 | ||
2298 | if (c->tty_path) | |
2299 | fprintf(f, | |
6ea832a2 LP |
2300 | "%sTTYPath: %s\n" |
2301 | "%sTTYReset: %s\n" | |
2302 | "%sTTYVHangup: %s\n" | |
2303 | "%sTTYVTDisallocate: %s\n", | |
2304 | prefix, c->tty_path, | |
2305 | prefix, yes_no(c->tty_reset), | |
2306 | prefix, yes_no(c->tty_vhangup), | |
2307 | prefix, yes_no(c->tty_vt_disallocate)); | |
94f04347 | 2308 | |
5ce70e5b ZJS |
2309 | if (c->std_output == EXEC_OUTPUT_SYSLOG || |
2310 | c->std_output == EXEC_OUTPUT_KMSG || | |
2311 | c->std_output == EXEC_OUTPUT_JOURNAL || | |
2312 | c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
2313 | c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
2314 | c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE || | |
2315 | c->std_error == EXEC_OUTPUT_SYSLOG || | |
2316 | c->std_error == EXEC_OUTPUT_KMSG || | |
2317 | c->std_error == EXEC_OUTPUT_JOURNAL || | |
2318 | c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
2319 | c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
2320 | c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) { | |
f8b69d1d | 2321 | |
5ce70e5b | 2322 | _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL; |
f8b69d1d | 2323 | |
5ce70e5b ZJS |
2324 | log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str); |
2325 | log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str); | |
f8b69d1d | 2326 | |
94f04347 LP |
2327 | fprintf(f, |
2328 | "%sSyslogFacility: %s\n" | |
2329 | "%sSyslogLevel: %s\n", | |
f8b69d1d MS |
2330 | prefix, strna(fac_str), |
2331 | prefix, strna(lvl_str)); | |
f8b69d1d | 2332 | } |
94f04347 LP |
2333 | |
2334 | if (c->capabilities) { | |
5ce70e5b ZJS |
2335 | _cleanup_cap_free_charp_ char *t; |
2336 | ||
2337 | t = cap_to_text(c->capabilities, NULL); | |
2338 | if (t) | |
2339 | fprintf(f, "%sCapabilities: %s\n", prefix, t); | |
94f04347 LP |
2340 | } |
2341 | ||
2342 | if (c->secure_bits) | |
2343 | fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n", | |
2344 | prefix, | |
cbb21cca ZJS |
2345 | (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "", |
2346 | (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "", | |
2347 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "", | |
2348 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "", | |
2349 | (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "", | |
2350 | (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : ""); | |
94f04347 LP |
2351 | |
2352 | if (c->capability_bounding_set_drop) { | |
ae556c21 | 2353 | unsigned long l; |
260abb78 | 2354 | fprintf(f, "%sCapabilityBoundingSet:", prefix); |
94f04347 | 2355 | |
64685e0c | 2356 | for (l = 0; l <= cap_last_cap(); l++) |
2822da4f LP |
2357 | if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) |
2358 | fprintf(f, " %s", strna(capability_to_name(l))); | |
94f04347 LP |
2359 | |
2360 | fputs("\n", f); | |
2361 | } | |
2362 | ||
2363 | if (c->user) | |
f2d3769a | 2364 | fprintf(f, "%sUser: %s\n", prefix, c->user); |
94f04347 | 2365 | if (c->group) |
f2d3769a | 2366 | fprintf(f, "%sGroup: %s\n", prefix, c->group); |
94f04347 | 2367 | |
15ae422b | 2368 | if (strv_length(c->supplementary_groups) > 0) { |
94f04347 | 2369 | fprintf(f, "%sSupplementaryGroups:", prefix); |
15ae422b LP |
2370 | strv_fprintf(f, c->supplementary_groups); |
2371 | fputs("\n", f); | |
2372 | } | |
94f04347 | 2373 | |
5b6319dc | 2374 | if (c->pam_name) |
f2d3769a | 2375 | fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name); |
5b6319dc | 2376 | |
15ae422b LP |
2377 | if (strv_length(c->read_write_dirs) > 0) { |
2378 | fprintf(f, "%sReadWriteDirs:", prefix); | |
2379 | strv_fprintf(f, c->read_write_dirs); | |
2380 | fputs("\n", f); | |
2381 | } | |
2382 | ||
2383 | if (strv_length(c->read_only_dirs) > 0) { | |
2384 | fprintf(f, "%sReadOnlyDirs:", prefix); | |
2385 | strv_fprintf(f, c->read_only_dirs); | |
2386 | fputs("\n", f); | |
2387 | } | |
94f04347 | 2388 | |
15ae422b LP |
2389 | if (strv_length(c->inaccessible_dirs) > 0) { |
2390 | fprintf(f, "%sInaccessibleDirs:", prefix); | |
2391 | strv_fprintf(f, c->inaccessible_dirs); | |
94f04347 LP |
2392 | fputs("\n", f); |
2393 | } | |
2e22afe9 | 2394 | |
169c1bda LP |
2395 | if (c->utmp_id) |
2396 | fprintf(f, | |
2397 | "%sUtmpIdentifier: %s\n", | |
2398 | prefix, c->utmp_id); | |
7b52a628 MS |
2399 | |
2400 | if (c->selinux_context) | |
2401 | fprintf(f, | |
5f8640fb LP |
2402 | "%sSELinuxContext: %s%s\n", |
2403 | prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context); | |
17df7223 | 2404 | |
ac45f971 LP |
2405 | if (c->personality != 0xffffffffUL) |
2406 | fprintf(f, | |
2407 | "%sPersonality: %s\n", | |
2408 | prefix, strna(personality_to_string(c->personality))); | |
2409 | ||
17df7223 | 2410 | if (c->syscall_filter) { |
351a19b1 | 2411 | #ifdef HAVE_SECCOMP |
17df7223 LP |
2412 | Iterator j; |
2413 | void *id; | |
2414 | bool first = true; | |
351a19b1 | 2415 | #endif |
17df7223 LP |
2416 | |
2417 | fprintf(f, | |
57183d11 | 2418 | "%sSystemCallFilter: ", |
17df7223 LP |
2419 | prefix); |
2420 | ||
2421 | if (!c->syscall_whitelist) | |
2422 | fputc('~', f); | |
2423 | ||
351a19b1 | 2424 | #ifdef HAVE_SECCOMP |
17df7223 LP |
2425 | SET_FOREACH(id, c->syscall_filter, j) { |
2426 | _cleanup_free_ char *name = NULL; | |
2427 | ||
2428 | if (first) | |
2429 | first = false; | |
2430 | else | |
2431 | fputc(' ', f); | |
2432 | ||
57183d11 | 2433 | name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1); |
17df7223 LP |
2434 | fputs(strna(name), f); |
2435 | } | |
351a19b1 | 2436 | #endif |
17df7223 LP |
2437 | |
2438 | fputc('\n', f); | |
2439 | } | |
2440 | ||
57183d11 LP |
2441 | if (c->syscall_archs) { |
2442 | #ifdef HAVE_SECCOMP | |
2443 | Iterator j; | |
2444 | void *id; | |
2445 | #endif | |
2446 | ||
2447 | fprintf(f, | |
2448 | "%sSystemCallArchitectures:", | |
2449 | prefix); | |
2450 | ||
2451 | #ifdef HAVE_SECCOMP | |
2452 | SET_FOREACH(id, c->syscall_archs, j) | |
2453 | fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1))); | |
2454 | #endif | |
2455 | fputc('\n', f); | |
2456 | } | |
2457 | ||
17df7223 LP |
2458 | if (c->syscall_errno != 0) |
2459 | fprintf(f, | |
2460 | "%sSystemCallErrorNumber: %s\n", | |
2461 | prefix, strna(errno_to_name(c->syscall_errno))); | |
eef65bf3 MS |
2462 | |
2463 | if (c->apparmor_profile) | |
2464 | fprintf(f, | |
2465 | "%sAppArmorProfile: %s%s\n", | |
2466 | prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile); | |
5cb5a6ff LP |
2467 | } |
2468 | ||
a931ad47 LP |
2469 | bool exec_context_maintains_privileges(ExecContext *c) { |
2470 | assert(c); | |
2471 | ||
2472 | /* Returns true if the process forked off would run run under | |
2473 | * an unchanged UID or as root. */ | |
2474 | ||
2475 | if (!c->user) | |
2476 | return true; | |
2477 | ||
2478 | if (streq(c->user, "root") || streq(c->user, "0")) | |
2479 | return true; | |
2480 | ||
2481 | return false; | |
2482 | } | |
2483 | ||
b58b4116 | 2484 | void exec_status_start(ExecStatus *s, pid_t pid) { |
034c6ed7 | 2485 | assert(s); |
5cb5a6ff | 2486 | |
b58b4116 LP |
2487 | zero(*s); |
2488 | s->pid = pid; | |
2489 | dual_timestamp_get(&s->start_timestamp); | |
2490 | } | |
2491 | ||
6ea832a2 | 2492 | void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) { |
b58b4116 LP |
2493 | assert(s); |
2494 | ||
0b1f4ae6 | 2495 | if (s->pid && s->pid != pid) |
b58b4116 LP |
2496 | zero(*s); |
2497 | ||
034c6ed7 | 2498 | s->pid = pid; |
63983207 | 2499 | dual_timestamp_get(&s->exit_timestamp); |
9fb86720 | 2500 | |
034c6ed7 LP |
2501 | s->code = code; |
2502 | s->status = status; | |
169c1bda | 2503 | |
6ea832a2 LP |
2504 | if (context) { |
2505 | if (context->utmp_id) | |
2506 | utmp_put_dead_process(context->utmp_id, pid, code, status); | |
2507 | ||
2508 | exec_context_tty_reset(context); | |
2509 | } | |
9fb86720 LP |
2510 | } |
2511 | ||
2512 | void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) { | |
2513 | char buf[FORMAT_TIMESTAMP_MAX]; | |
2514 | ||
2515 | assert(s); | |
2516 | assert(f); | |
2517 | ||
9fb86720 LP |
2518 | if (s->pid <= 0) |
2519 | return; | |
2520 | ||
4c940960 LP |
2521 | prefix = strempty(prefix); |
2522 | ||
9fb86720 | 2523 | fprintf(f, |
ccd06097 ZJS |
2524 | "%sPID: "PID_FMT"\n", |
2525 | prefix, s->pid); | |
9fb86720 | 2526 | |
63983207 | 2527 | if (s->start_timestamp.realtime > 0) |
9fb86720 LP |
2528 | fprintf(f, |
2529 | "%sStart Timestamp: %s\n", | |
63983207 | 2530 | prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime)); |
9fb86720 | 2531 | |
63983207 | 2532 | if (s->exit_timestamp.realtime > 0) |
9fb86720 LP |
2533 | fprintf(f, |
2534 | "%sExit Timestamp: %s\n" | |
2535 | "%sExit Code: %s\n" | |
2536 | "%sExit Status: %i\n", | |
63983207 | 2537 | prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime), |
9fb86720 LP |
2538 | prefix, sigchld_code_to_string(s->code), |
2539 | prefix, s->status); | |
5cb5a6ff | 2540 | } |
44d8db9e | 2541 | |
9e2f7c11 | 2542 | char *exec_command_line(char **argv) { |
44d8db9e LP |
2543 | size_t k; |
2544 | char *n, *p, **a; | |
2545 | bool first = true; | |
2546 | ||
9e2f7c11 | 2547 | assert(argv); |
44d8db9e | 2548 | |
9164977d | 2549 | k = 1; |
9e2f7c11 | 2550 | STRV_FOREACH(a, argv) |
44d8db9e LP |
2551 | k += strlen(*a)+3; |
2552 | ||
2553 | if (!(n = new(char, k))) | |
2554 | return NULL; | |
2555 | ||
2556 | p = n; | |
9e2f7c11 | 2557 | STRV_FOREACH(a, argv) { |
44d8db9e LP |
2558 | |
2559 | if (!first) | |
2560 | *(p++) = ' '; | |
2561 | else | |
2562 | first = false; | |
2563 | ||
2564 | if (strpbrk(*a, WHITESPACE)) { | |
2565 | *(p++) = '\''; | |
2566 | p = stpcpy(p, *a); | |
2567 | *(p++) = '\''; | |
2568 | } else | |
2569 | p = stpcpy(p, *a); | |
2570 | ||
2571 | } | |
2572 | ||
9164977d LP |
2573 | *p = 0; |
2574 | ||
44d8db9e LP |
2575 | /* FIXME: this doesn't really handle arguments that have |
2576 | * spaces and ticks in them */ | |
2577 | ||
2578 | return n; | |
2579 | } | |
2580 | ||
2581 | void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) { | |
e1d75803 | 2582 | _cleanup_free_ char *cmd = NULL; |
4c940960 | 2583 | const char *prefix2; |
44d8db9e LP |
2584 | |
2585 | assert(c); | |
2586 | assert(f); | |
2587 | ||
4c940960 | 2588 | prefix = strempty(prefix); |
63c372cb | 2589 | prefix2 = strjoina(prefix, "\t"); |
44d8db9e | 2590 | |
9e2f7c11 | 2591 | cmd = exec_command_line(c->argv); |
44d8db9e LP |
2592 | fprintf(f, |
2593 | "%sCommand Line: %s\n", | |
2594 | prefix, cmd ? cmd : strerror(ENOMEM)); | |
2595 | ||
9fb86720 | 2596 | exec_status_dump(&c->exec_status, f, prefix2); |
44d8db9e LP |
2597 | } |
2598 | ||
2599 | void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) { | |
2600 | assert(f); | |
2601 | ||
4c940960 | 2602 | prefix = strempty(prefix); |
44d8db9e LP |
2603 | |
2604 | LIST_FOREACH(command, c, c) | |
2605 | exec_command_dump(c, f, prefix); | |
2606 | } | |
94f04347 | 2607 | |
a6a80b4f LP |
2608 | void exec_command_append_list(ExecCommand **l, ExecCommand *e) { |
2609 | ExecCommand *end; | |
2610 | ||
2611 | assert(l); | |
2612 | assert(e); | |
2613 | ||
2614 | if (*l) { | |
35b8ca3a | 2615 | /* It's kind of important, that we keep the order here */ |
71fda00f LP |
2616 | LIST_FIND_TAIL(command, *l, end); |
2617 | LIST_INSERT_AFTER(command, *l, end, e); | |
a6a80b4f LP |
2618 | } else |
2619 | *l = e; | |
2620 | } | |
2621 | ||
26fd040d LP |
2622 | int exec_command_set(ExecCommand *c, const char *path, ...) { |
2623 | va_list ap; | |
2624 | char **l, *p; | |
2625 | ||
2626 | assert(c); | |
2627 | assert(path); | |
2628 | ||
2629 | va_start(ap, path); | |
2630 | l = strv_new_ap(path, ap); | |
2631 | va_end(ap); | |
2632 | ||
2633 | if (!l) | |
2634 | return -ENOMEM; | |
2635 | ||
250a918d LP |
2636 | p = strdup(path); |
2637 | if (!p) { | |
26fd040d LP |
2638 | strv_free(l); |
2639 | return -ENOMEM; | |
2640 | } | |
2641 | ||
2642 | free(c->path); | |
2643 | c->path = p; | |
2644 | ||
2645 | strv_free(c->argv); | |
2646 | c->argv = l; | |
2647 | ||
2648 | return 0; | |
2649 | } | |
2650 | ||
86b23b07 | 2651 | int exec_command_append(ExecCommand *c, const char *path, ...) { |
e63ff941 | 2652 | _cleanup_strv_free_ char **l = NULL; |
86b23b07 | 2653 | va_list ap; |
86b23b07 JS |
2654 | int r; |
2655 | ||
2656 | assert(c); | |
2657 | assert(path); | |
2658 | ||
2659 | va_start(ap, path); | |
2660 | l = strv_new_ap(path, ap); | |
2661 | va_end(ap); | |
2662 | ||
2663 | if (!l) | |
2664 | return -ENOMEM; | |
2665 | ||
2666 | r = strv_extend_strv(&c->argv, l); | |
e63ff941 | 2667 | if (r < 0) |
86b23b07 | 2668 | return r; |
86b23b07 JS |
2669 | |
2670 | return 0; | |
2671 | } | |
2672 | ||
2673 | ||
613b411c LP |
2674 | static int exec_runtime_allocate(ExecRuntime **rt) { |
2675 | ||
2676 | if (*rt) | |
2677 | return 0; | |
2678 | ||
2679 | *rt = new0(ExecRuntime, 1); | |
f146f5e1 | 2680 | if (!*rt) |
613b411c LP |
2681 | return -ENOMEM; |
2682 | ||
2683 | (*rt)->n_ref = 1; | |
2684 | (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1; | |
2685 | ||
2686 | return 0; | |
2687 | } | |
2688 | ||
2689 | int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) { | |
2690 | int r; | |
2691 | ||
2692 | assert(rt); | |
2693 | assert(c); | |
2694 | assert(id); | |
2695 | ||
2696 | if (*rt) | |
2697 | return 1; | |
2698 | ||
2699 | if (!c->private_network && !c->private_tmp) | |
2700 | return 0; | |
2701 | ||
2702 | r = exec_runtime_allocate(rt); | |
2703 | if (r < 0) | |
2704 | return r; | |
2705 | ||
2706 | if (c->private_network && (*rt)->netns_storage_socket[0] < 0) { | |
2707 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, (*rt)->netns_storage_socket) < 0) | |
2708 | return -errno; | |
2709 | } | |
2710 | ||
2711 | if (c->private_tmp && !(*rt)->tmp_dir) { | |
2712 | r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir); | |
2713 | if (r < 0) | |
2714 | return r; | |
2715 | } | |
2716 | ||
2717 | return 1; | |
2718 | } | |
2719 | ||
2720 | ExecRuntime *exec_runtime_ref(ExecRuntime *r) { | |
2721 | assert(r); | |
2722 | assert(r->n_ref > 0); | |
2723 | ||
2724 | r->n_ref++; | |
2725 | return r; | |
2726 | } | |
2727 | ||
2728 | ExecRuntime *exec_runtime_unref(ExecRuntime *r) { | |
2729 | ||
2730 | if (!r) | |
2731 | return NULL; | |
2732 | ||
2733 | assert(r->n_ref > 0); | |
2734 | ||
2735 | r->n_ref--; | |
f2341e0a LP |
2736 | if (r->n_ref > 0) |
2737 | return NULL; | |
2738 | ||
2739 | free(r->tmp_dir); | |
2740 | free(r->var_tmp_dir); | |
2741 | safe_close_pair(r->netns_storage_socket); | |
2742 | free(r); | |
613b411c LP |
2743 | |
2744 | return NULL; | |
2745 | } | |
2746 | ||
f2341e0a | 2747 | int exec_runtime_serialize(Unit *u, ExecRuntime *rt, FILE *f, FDSet *fds) { |
613b411c LP |
2748 | assert(u); |
2749 | assert(f); | |
2750 | assert(fds); | |
2751 | ||
2752 | if (!rt) | |
2753 | return 0; | |
2754 | ||
2755 | if (rt->tmp_dir) | |
2756 | unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir); | |
2757 | ||
2758 | if (rt->var_tmp_dir) | |
2759 | unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir); | |
2760 | ||
2761 | if (rt->netns_storage_socket[0] >= 0) { | |
2762 | int copy; | |
2763 | ||
2764 | copy = fdset_put_dup(fds, rt->netns_storage_socket[0]); | |
2765 | if (copy < 0) | |
2766 | return copy; | |
2767 | ||
2768 | unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy); | |
2769 | } | |
2770 | ||
2771 | if (rt->netns_storage_socket[1] >= 0) { | |
2772 | int copy; | |
2773 | ||
2774 | copy = fdset_put_dup(fds, rt->netns_storage_socket[1]); | |
2775 | if (copy < 0) | |
2776 | return copy; | |
2777 | ||
2778 | unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy); | |
2779 | } | |
2780 | ||
2781 | return 0; | |
2782 | } | |
2783 | ||
f2341e0a | 2784 | int exec_runtime_deserialize_item(Unit *u, ExecRuntime **rt, const char *key, const char *value, FDSet *fds) { |
613b411c LP |
2785 | int r; |
2786 | ||
2787 | assert(rt); | |
2788 | assert(key); | |
2789 | assert(value); | |
2790 | ||
2791 | if (streq(key, "tmp-dir")) { | |
2792 | char *copy; | |
2793 | ||
2794 | r = exec_runtime_allocate(rt); | |
2795 | if (r < 0) | |
f2341e0a | 2796 | return log_oom(); |
613b411c LP |
2797 | |
2798 | copy = strdup(value); | |
2799 | if (!copy) | |
2800 | return log_oom(); | |
2801 | ||
2802 | free((*rt)->tmp_dir); | |
2803 | (*rt)->tmp_dir = copy; | |
2804 | ||
2805 | } else if (streq(key, "var-tmp-dir")) { | |
2806 | char *copy; | |
2807 | ||
2808 | r = exec_runtime_allocate(rt); | |
2809 | if (r < 0) | |
f2341e0a | 2810 | return log_oom(); |
613b411c LP |
2811 | |
2812 | copy = strdup(value); | |
2813 | if (!copy) | |
2814 | return log_oom(); | |
2815 | ||
2816 | free((*rt)->var_tmp_dir); | |
2817 | (*rt)->var_tmp_dir = copy; | |
2818 | ||
2819 | } else if (streq(key, "netns-socket-0")) { | |
2820 | int fd; | |
2821 | ||
2822 | r = exec_runtime_allocate(rt); | |
2823 | if (r < 0) | |
f2341e0a | 2824 | return log_oom(); |
613b411c LP |
2825 | |
2826 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 2827 | log_unit_debug(u, "Failed to parse netns socket value: %s", value); |
613b411c | 2828 | else { |
03e334a1 | 2829 | safe_close((*rt)->netns_storage_socket[0]); |
613b411c LP |
2830 | (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd); |
2831 | } | |
2832 | } else if (streq(key, "netns-socket-1")) { | |
2833 | int fd; | |
2834 | ||
2835 | r = exec_runtime_allocate(rt); | |
2836 | if (r < 0) | |
f2341e0a | 2837 | return log_oom(); |
613b411c LP |
2838 | |
2839 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 2840 | log_unit_debug(u, "Failed to parse netns socket value: %s", value); |
613b411c | 2841 | else { |
03e334a1 | 2842 | safe_close((*rt)->netns_storage_socket[1]); |
613b411c LP |
2843 | (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd); |
2844 | } | |
2845 | } else | |
2846 | return 0; | |
2847 | ||
2848 | return 1; | |
2849 | } | |
2850 | ||
2851 | static void *remove_tmpdir_thread(void *p) { | |
2852 | _cleanup_free_ char *path = p; | |
2853 | ||
c6878637 | 2854 | (void) rm_rf(path, REMOVE_ROOT|REMOVE_PHYSICAL); |
613b411c LP |
2855 | return NULL; |
2856 | } | |
2857 | ||
2858 | void exec_runtime_destroy(ExecRuntime *rt) { | |
98b47d54 LP |
2859 | int r; |
2860 | ||
613b411c LP |
2861 | if (!rt) |
2862 | return; | |
2863 | ||
2864 | /* If there are multiple users of this, let's leave the stuff around */ | |
2865 | if (rt->n_ref > 1) | |
2866 | return; | |
2867 | ||
2868 | if (rt->tmp_dir) { | |
2869 | log_debug("Spawning thread to nuke %s", rt->tmp_dir); | |
98b47d54 LP |
2870 | |
2871 | r = asynchronous_job(remove_tmpdir_thread, rt->tmp_dir); | |
2872 | if (r < 0) { | |
da927ba9 | 2873 | log_warning_errno(r, "Failed to nuke %s: %m", rt->tmp_dir); |
98b47d54 LP |
2874 | free(rt->tmp_dir); |
2875 | } | |
2876 | ||
613b411c LP |
2877 | rt->tmp_dir = NULL; |
2878 | } | |
2879 | ||
2880 | if (rt->var_tmp_dir) { | |
2881 | log_debug("Spawning thread to nuke %s", rt->var_tmp_dir); | |
98b47d54 LP |
2882 | |
2883 | r = asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir); | |
2884 | if (r < 0) { | |
da927ba9 | 2885 | log_warning_errno(r, "Failed to nuke %s: %m", rt->var_tmp_dir); |
98b47d54 LP |
2886 | free(rt->var_tmp_dir); |
2887 | } | |
2888 | ||
613b411c LP |
2889 | rt->var_tmp_dir = NULL; |
2890 | } | |
2891 | ||
3d94f76c | 2892 | safe_close_pair(rt->netns_storage_socket); |
613b411c LP |
2893 | } |
2894 | ||
80876c20 LP |
2895 | static const char* const exec_input_table[_EXEC_INPUT_MAX] = { |
2896 | [EXEC_INPUT_NULL] = "null", | |
2897 | [EXEC_INPUT_TTY] = "tty", | |
2898 | [EXEC_INPUT_TTY_FORCE] = "tty-force", | |
4f2d528d LP |
2899 | [EXEC_INPUT_TTY_FAIL] = "tty-fail", |
2900 | [EXEC_INPUT_SOCKET] = "socket" | |
80876c20 LP |
2901 | }; |
2902 | ||
8a0867d6 LP |
2903 | DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput); |
2904 | ||
94f04347 | 2905 | static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = { |
80876c20 | 2906 | [EXEC_OUTPUT_INHERIT] = "inherit", |
94f04347 | 2907 | [EXEC_OUTPUT_NULL] = "null", |
80876c20 | 2908 | [EXEC_OUTPUT_TTY] = "tty", |
94f04347 | 2909 | [EXEC_OUTPUT_SYSLOG] = "syslog", |
28dbc1e8 | 2910 | [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console", |
9a6bca7a | 2911 | [EXEC_OUTPUT_KMSG] = "kmsg", |
28dbc1e8 | 2912 | [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console", |
706343f4 LP |
2913 | [EXEC_OUTPUT_JOURNAL] = "journal", |
2914 | [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console", | |
4f2d528d | 2915 | [EXEC_OUTPUT_SOCKET] = "socket" |
94f04347 LP |
2916 | }; |
2917 | ||
2918 | DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput); |