]>
Commit | Line | Data |
---|---|---|
663996b3 MS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
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 | |
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 | |
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 | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <assert.h> | |
23 | #include <dirent.h> | |
24 | #include <errno.h> | |
25 | #include <fcntl.h> | |
26 | #include <unistd.h> | |
27 | #include <string.h> | |
28 | #include <signal.h> | |
29 | #include <sys/socket.h> | |
30 | #include <sys/un.h> | |
31 | #include <sys/prctl.h> | |
32 | #include <linux/sched.h> | |
33 | #include <sys/types.h> | |
34 | #include <sys/stat.h> | |
35 | #include <grp.h> | |
36 | #include <pwd.h> | |
37 | #include <sys/mount.h> | |
38 | #include <linux/fs.h> | |
39 | #include <linux/oom.h> | |
40 | #include <sys/poll.h> | |
663996b3 | 41 | #include <glob.h> |
60f067b4 | 42 | #include <sys/personality.h> |
663996b3 | 43 | #include <libgen.h> |
60f067b4 | 44 | #undef basename |
663996b3 MS |
45 | |
46 | #ifdef HAVE_PAM | |
47 | #include <security/pam_appl.h> | |
48 | #endif | |
49 | ||
60f067b4 JS |
50 | #ifdef HAVE_SELINUX |
51 | #include <selinux/selinux.h> | |
52 | #endif | |
53 | ||
54 | #ifdef HAVE_SECCOMP | |
55 | #include <seccomp.h> | |
56 | #endif | |
57 | ||
58 | #ifdef HAVE_APPARMOR | |
59 | #include <sys/apparmor.h> | |
60 | #endif | |
61 | ||
663996b3 MS |
62 | #include "execute.h" |
63 | #include "strv.h" | |
64 | #include "macro.h" | |
65 | #include "capability.h" | |
66 | #include "util.h" | |
67 | #include "log.h" | |
68 | #include "sd-messages.h" | |
69 | #include "ioprio.h" | |
70 | #include "securebits.h" | |
663996b3 | 71 | #include "namespace.h" |
663996b3 MS |
72 | #include "exit-status.h" |
73 | #include "missing.h" | |
74 | #include "utmp-wtmp.h" | |
75 | #include "def.h" | |
663996b3 | 76 | #include "path-util.h" |
663996b3 MS |
77 | #include "env-util.h" |
78 | #include "fileio.h" | |
14228c0d MB |
79 | #include "unit.h" |
80 | #include "async.h" | |
60f067b4 JS |
81 | #include "selinux-util.h" |
82 | #include "errno-list.h" | |
83 | #include "af-list.h" | |
84 | #include "mkdir.h" | |
85 | #include "apparmor-util.h" | |
f47781d8 | 86 | #include "smack-util.h" |
5eef597e MP |
87 | #include "bus-kernel.h" |
88 | #include "label.h" | |
f47781d8 | 89 | #include "cap-list.h" |
60f067b4 JS |
90 | |
91 | #ifdef HAVE_SECCOMP | |
92 | #include "seccomp-util.h" | |
93 | #endif | |
663996b3 MS |
94 | |
95 | #define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC) | |
14228c0d | 96 | #define IDLE_TIMEOUT2_USEC (1*USEC_PER_SEC) |
663996b3 MS |
97 | |
98 | /* This assumes there is a 'tty' group */ | |
99 | #define TTY_MODE 0620 | |
100 | ||
60f067b4 JS |
101 | #define SNDBUF_SIZE (8*1024*1024) |
102 | ||
663996b3 MS |
103 | static int shift_fds(int fds[], unsigned n_fds) { |
104 | int start, restart_from; | |
105 | ||
106 | if (n_fds <= 0) | |
107 | return 0; | |
108 | ||
109 | /* Modifies the fds array! (sorts it) */ | |
110 | ||
111 | assert(fds); | |
112 | ||
113 | start = 0; | |
114 | for (;;) { | |
115 | int i; | |
116 | ||
117 | restart_from = -1; | |
118 | ||
119 | for (i = start; i < (int) n_fds; i++) { | |
120 | int nfd; | |
121 | ||
122 | /* Already at right index? */ | |
123 | if (fds[i] == i+3) | |
124 | continue; | |
125 | ||
126 | if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0) | |
127 | return -errno; | |
128 | ||
60f067b4 | 129 | safe_close(fds[i]); |
663996b3 MS |
130 | fds[i] = nfd; |
131 | ||
132 | /* Hmm, the fd we wanted isn't free? Then | |
133 | * let's remember that and try again from here*/ | |
134 | if (nfd != i+3 && restart_from < 0) | |
135 | restart_from = i; | |
136 | } | |
137 | ||
138 | if (restart_from < 0) | |
139 | break; | |
140 | ||
141 | start = restart_from; | |
142 | } | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) { | |
148 | unsigned i; | |
149 | int r; | |
150 | ||
151 | if (n_fds <= 0) | |
152 | return 0; | |
153 | ||
154 | assert(fds); | |
155 | ||
156 | /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */ | |
157 | ||
158 | for (i = 0; i < n_fds; i++) { | |
159 | ||
160 | if ((r = fd_nonblock(fds[i], nonblock)) < 0) | |
161 | return r; | |
162 | ||
163 | /* We unconditionally drop FD_CLOEXEC from the fds, | |
164 | * since after all we want to pass these fds to our | |
165 | * children */ | |
166 | ||
167 | if ((r = fd_cloexec(fds[i], false)) < 0) | |
168 | return r; | |
169 | } | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | _pure_ static const char *tty_path(const ExecContext *context) { | |
175 | assert(context); | |
176 | ||
177 | if (context->tty_path) | |
178 | return context->tty_path; | |
179 | ||
180 | return "/dev/console"; | |
181 | } | |
182 | ||
60f067b4 | 183 | static void exec_context_tty_reset(const ExecContext *context) { |
663996b3 MS |
184 | assert(context); |
185 | ||
186 | if (context->tty_vhangup) | |
187 | terminal_vhangup(tty_path(context)); | |
188 | ||
189 | if (context->tty_reset) | |
190 | reset_terminal(tty_path(context)); | |
191 | ||
192 | if (context->tty_vt_disallocate && context->tty_path) | |
193 | vt_disallocate(context->tty_path); | |
194 | } | |
195 | ||
196 | static bool is_terminal_output(ExecOutput o) { | |
197 | return | |
198 | o == EXEC_OUTPUT_TTY || | |
199 | o == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
200 | o == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
201 | o == EXEC_OUTPUT_JOURNAL_AND_CONSOLE; | |
202 | } | |
203 | ||
663996b3 MS |
204 | static int open_null_as(int flags, int nfd) { |
205 | int fd, r; | |
206 | ||
207 | assert(nfd >= 0); | |
208 | ||
60f067b4 JS |
209 | fd = open("/dev/null", flags|O_NOCTTY); |
210 | if (fd < 0) | |
663996b3 MS |
211 | return -errno; |
212 | ||
213 | if (fd != nfd) { | |
214 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
60f067b4 | 215 | safe_close(fd); |
663996b3 MS |
216 | } else |
217 | r = nfd; | |
218 | ||
219 | return r; | |
220 | } | |
221 | ||
222 | static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, const char *unit_id, int nfd) { | |
223 | int fd, r; | |
224 | union sockaddr_union sa = { | |
225 | .un.sun_family = AF_UNIX, | |
226 | .un.sun_path = "/run/systemd/journal/stdout", | |
227 | }; | |
228 | ||
229 | assert(context); | |
230 | assert(output < _EXEC_OUTPUT_MAX); | |
231 | assert(ident); | |
232 | assert(nfd >= 0); | |
233 | ||
234 | fd = socket(AF_UNIX, SOCK_STREAM, 0); | |
235 | if (fd < 0) | |
236 | return -errno; | |
237 | ||
238 | r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)); | |
239 | if (r < 0) { | |
60f067b4 | 240 | safe_close(fd); |
663996b3 MS |
241 | return -errno; |
242 | } | |
243 | ||
244 | if (shutdown(fd, SHUT_RD) < 0) { | |
60f067b4 | 245 | safe_close(fd); |
663996b3 MS |
246 | return -errno; |
247 | } | |
248 | ||
60f067b4 JS |
249 | fd_inc_sndbuf(fd, SNDBUF_SIZE); |
250 | ||
663996b3 MS |
251 | dprintf(fd, |
252 | "%s\n" | |
253 | "%s\n" | |
254 | "%i\n" | |
255 | "%i\n" | |
256 | "%i\n" | |
257 | "%i\n" | |
258 | "%i\n", | |
259 | context->syslog_identifier ? context->syslog_identifier : ident, | |
260 | unit_id, | |
261 | context->syslog_priority, | |
262 | !!context->syslog_level_prefix, | |
263 | output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE, | |
264 | output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE, | |
265 | is_terminal_output(output)); | |
266 | ||
267 | if (fd != nfd) { | |
268 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
60f067b4 | 269 | safe_close(fd); |
663996b3 MS |
270 | } else |
271 | r = nfd; | |
272 | ||
273 | return r; | |
274 | } | |
275 | static int open_terminal_as(const char *path, mode_t mode, int nfd) { | |
276 | int fd, r; | |
277 | ||
278 | assert(path); | |
279 | assert(nfd >= 0); | |
280 | ||
281 | if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0) | |
282 | return fd; | |
283 | ||
284 | if (fd != nfd) { | |
285 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
60f067b4 | 286 | safe_close(fd); |
663996b3 MS |
287 | } else |
288 | r = nfd; | |
289 | ||
290 | return r; | |
291 | } | |
292 | ||
293 | static bool is_terminal_input(ExecInput i) { | |
294 | return | |
295 | i == EXEC_INPUT_TTY || | |
296 | i == EXEC_INPUT_TTY_FORCE || | |
297 | i == EXEC_INPUT_TTY_FAIL; | |
298 | } | |
299 | ||
300 | static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) { | |
301 | ||
302 | if (is_terminal_input(std_input) && !apply_tty_stdin) | |
303 | return EXEC_INPUT_NULL; | |
304 | ||
305 | if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0) | |
306 | return EXEC_INPUT_NULL; | |
307 | ||
308 | return std_input; | |
309 | } | |
310 | ||
311 | static int fixup_output(ExecOutput std_output, int socket_fd) { | |
312 | ||
313 | if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0) | |
314 | return EXEC_OUTPUT_INHERIT; | |
315 | ||
316 | return std_output; | |
317 | } | |
318 | ||
319 | static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) { | |
320 | ExecInput i; | |
321 | ||
322 | assert(context); | |
323 | ||
324 | i = fixup_input(context->std_input, socket_fd, apply_tty_stdin); | |
325 | ||
326 | switch (i) { | |
327 | ||
328 | case EXEC_INPUT_NULL: | |
329 | return open_null_as(O_RDONLY, STDIN_FILENO); | |
330 | ||
331 | case EXEC_INPUT_TTY: | |
332 | case EXEC_INPUT_TTY_FORCE: | |
333 | case EXEC_INPUT_TTY_FAIL: { | |
334 | int fd, r; | |
335 | ||
60f067b4 JS |
336 | fd = acquire_terminal(tty_path(context), |
337 | i == EXEC_INPUT_TTY_FAIL, | |
338 | i == EXEC_INPUT_TTY_FORCE, | |
339 | false, | |
5eef597e | 340 | USEC_INFINITY); |
60f067b4 | 341 | if (fd < 0) |
663996b3 MS |
342 | return fd; |
343 | ||
344 | if (fd != STDIN_FILENO) { | |
345 | r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
60f067b4 | 346 | safe_close(fd); |
663996b3 MS |
347 | } else |
348 | r = STDIN_FILENO; | |
349 | ||
350 | return r; | |
351 | } | |
352 | ||
353 | case EXEC_INPUT_SOCKET: | |
354 | return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
355 | ||
356 | default: | |
357 | assert_not_reached("Unknown input type"); | |
358 | } | |
359 | } | |
360 | ||
361 | static int setup_output(const ExecContext *context, int fileno, int socket_fd, const char *ident, const char *unit_id, bool apply_tty_stdin) { | |
362 | ExecOutput o; | |
363 | ExecInput i; | |
364 | int r; | |
365 | ||
366 | assert(context); | |
367 | assert(ident); | |
368 | ||
369 | i = fixup_input(context->std_input, socket_fd, apply_tty_stdin); | |
370 | o = fixup_output(context->std_output, socket_fd); | |
371 | ||
372 | if (fileno == STDERR_FILENO) { | |
373 | ExecOutput e; | |
374 | e = fixup_output(context->std_error, socket_fd); | |
375 | ||
376 | /* This expects the input and output are already set up */ | |
377 | ||
378 | /* Don't change the stderr file descriptor if we inherit all | |
379 | * the way and are not on a tty */ | |
380 | if (e == EXEC_OUTPUT_INHERIT && | |
381 | o == EXEC_OUTPUT_INHERIT && | |
382 | i == EXEC_INPUT_NULL && | |
383 | !is_terminal_input(context->std_input) && | |
384 | getppid () != 1) | |
385 | return fileno; | |
386 | ||
387 | /* Duplicate from stdout if possible */ | |
388 | if (e == o || e == EXEC_OUTPUT_INHERIT) | |
389 | return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno; | |
390 | ||
391 | o = e; | |
392 | ||
393 | } else if (o == EXEC_OUTPUT_INHERIT) { | |
394 | /* If input got downgraded, inherit the original value */ | |
395 | if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input)) | |
396 | return open_terminal_as(tty_path(context), O_WRONLY, fileno); | |
397 | ||
398 | /* If the input is connected to anything that's not a /dev/null, inherit that... */ | |
399 | if (i != EXEC_INPUT_NULL) | |
400 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; | |
401 | ||
402 | /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */ | |
403 | if (getppid() != 1) | |
404 | return fileno; | |
405 | ||
406 | /* We need to open /dev/null here anew, to get the right access mode. */ | |
407 | return open_null_as(O_WRONLY, fileno); | |
408 | } | |
409 | ||
410 | switch (o) { | |
411 | ||
412 | case EXEC_OUTPUT_NULL: | |
413 | return open_null_as(O_WRONLY, fileno); | |
414 | ||
415 | case EXEC_OUTPUT_TTY: | |
416 | if (is_terminal_input(i)) | |
417 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; | |
418 | ||
419 | /* We don't reset the terminal if this is just about output */ | |
420 | return open_terminal_as(tty_path(context), O_WRONLY, fileno); | |
421 | ||
422 | case EXEC_OUTPUT_SYSLOG: | |
423 | case EXEC_OUTPUT_SYSLOG_AND_CONSOLE: | |
424 | case EXEC_OUTPUT_KMSG: | |
425 | case EXEC_OUTPUT_KMSG_AND_CONSOLE: | |
426 | case EXEC_OUTPUT_JOURNAL: | |
427 | case EXEC_OUTPUT_JOURNAL_AND_CONSOLE: | |
428 | r = connect_logger_as(context, o, ident, unit_id, fileno); | |
429 | if (r < 0) { | |
f47781d8 MP |
430 | log_unit_struct(unit_id, |
431 | LOG_CRIT, | |
432 | LOG_MESSAGE("Failed to connect %s of %s to the journal socket: %s", | |
433 | fileno == STDOUT_FILENO ? "stdout" : "stderr", | |
434 | unit_id, strerror(-r)), | |
435 | LOG_ERRNO(-r), | |
436 | NULL); | |
663996b3 MS |
437 | r = open_null_as(O_WRONLY, fileno); |
438 | } | |
439 | return r; | |
440 | ||
441 | case EXEC_OUTPUT_SOCKET: | |
442 | assert(socket_fd >= 0); | |
443 | return dup2(socket_fd, fileno) < 0 ? -errno : fileno; | |
444 | ||
445 | default: | |
446 | assert_not_reached("Unknown error type"); | |
447 | } | |
448 | } | |
449 | ||
450 | static int chown_terminal(int fd, uid_t uid) { | |
451 | struct stat st; | |
452 | ||
453 | assert(fd >= 0); | |
454 | ||
455 | /* This might fail. What matters are the results. */ | |
456 | (void) fchown(fd, uid, -1); | |
457 | (void) fchmod(fd, TTY_MODE); | |
458 | ||
459 | if (fstat(fd, &st) < 0) | |
460 | return -errno; | |
461 | ||
462 | if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE) | |
463 | return -EPERM; | |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
468 | static int setup_confirm_stdio(int *_saved_stdin, | |
469 | int *_saved_stdout) { | |
470 | int fd = -1, saved_stdin, saved_stdout = -1, r; | |
471 | ||
472 | assert(_saved_stdin); | |
473 | assert(_saved_stdout); | |
474 | ||
475 | saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3); | |
476 | if (saved_stdin < 0) | |
477 | return -errno; | |
478 | ||
479 | saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3); | |
480 | if (saved_stdout < 0) { | |
481 | r = errno; | |
482 | goto fail; | |
483 | } | |
484 | ||
485 | fd = acquire_terminal( | |
486 | "/dev/console", | |
487 | false, | |
488 | false, | |
489 | false, | |
490 | DEFAULT_CONFIRM_USEC); | |
491 | if (fd < 0) { | |
492 | r = fd; | |
493 | goto fail; | |
494 | } | |
495 | ||
496 | r = chown_terminal(fd, getuid()); | |
497 | if (r < 0) | |
498 | goto fail; | |
499 | ||
500 | if (dup2(fd, STDIN_FILENO) < 0) { | |
501 | r = -errno; | |
502 | goto fail; | |
503 | } | |
504 | ||
505 | if (dup2(fd, STDOUT_FILENO) < 0) { | |
506 | r = -errno; | |
507 | goto fail; | |
508 | } | |
509 | ||
510 | if (fd >= 2) | |
60f067b4 | 511 | safe_close(fd); |
663996b3 MS |
512 | |
513 | *_saved_stdin = saved_stdin; | |
514 | *_saved_stdout = saved_stdout; | |
515 | ||
516 | return 0; | |
517 | ||
518 | fail: | |
60f067b4 JS |
519 | safe_close(saved_stdout); |
520 | safe_close(saved_stdin); | |
521 | safe_close(fd); | |
663996b3 MS |
522 | |
523 | return r; | |
524 | } | |
525 | ||
60f067b4 JS |
526 | _printf_(1, 2) static int write_confirm_message(const char *format, ...) { |
527 | _cleanup_close_ int fd = -1; | |
663996b3 MS |
528 | va_list ap; |
529 | ||
530 | assert(format); | |
531 | ||
532 | fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); | |
533 | if (fd < 0) | |
534 | return fd; | |
535 | ||
536 | va_start(ap, format); | |
537 | vdprintf(fd, format, ap); | |
538 | va_end(ap); | |
539 | ||
663996b3 MS |
540 | return 0; |
541 | } | |
542 | ||
543 | static int restore_confirm_stdio(int *saved_stdin, | |
544 | int *saved_stdout) { | |
545 | ||
546 | int r = 0; | |
547 | ||
548 | assert(saved_stdin); | |
549 | assert(saved_stdout); | |
550 | ||
551 | release_terminal(); | |
552 | ||
553 | if (*saved_stdin >= 0) | |
554 | if (dup2(*saved_stdin, STDIN_FILENO) < 0) | |
555 | r = -errno; | |
556 | ||
557 | if (*saved_stdout >= 0) | |
558 | if (dup2(*saved_stdout, STDOUT_FILENO) < 0) | |
559 | r = -errno; | |
560 | ||
60f067b4 JS |
561 | safe_close(*saved_stdin); |
562 | safe_close(*saved_stdout); | |
663996b3 MS |
563 | |
564 | return r; | |
565 | } | |
566 | ||
567 | static int ask_for_confirmation(char *response, char **argv) { | |
568 | int saved_stdout = -1, saved_stdin = -1, r; | |
e842803a | 569 | _cleanup_free_ char *line = NULL; |
663996b3 MS |
570 | |
571 | r = setup_confirm_stdio(&saved_stdin, &saved_stdout); | |
572 | if (r < 0) | |
573 | return r; | |
574 | ||
575 | line = exec_command_line(argv); | |
576 | if (!line) | |
577 | return -ENOMEM; | |
578 | ||
5eef597e | 579 | r = ask_char(response, "yns", "Execute %s? [Yes, No, Skip] ", line); |
663996b3 MS |
580 | |
581 | restore_confirm_stdio(&saved_stdin, &saved_stdout); | |
582 | ||
583 | return r; | |
584 | } | |
585 | ||
586 | static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) { | |
587 | bool keep_groups = false; | |
588 | int r; | |
589 | ||
590 | assert(context); | |
591 | ||
592 | /* Lookup and set GID and supplementary group list. Here too | |
593 | * we avoid NSS lookups for gid=0. */ | |
594 | ||
595 | if (context->group || username) { | |
596 | ||
597 | if (context->group) { | |
598 | const char *g = context->group; | |
599 | ||
600 | if ((r = get_group_creds(&g, &gid)) < 0) | |
601 | return r; | |
602 | } | |
603 | ||
604 | /* First step, initialize groups from /etc/groups */ | |
605 | if (username && gid != 0) { | |
606 | if (initgroups(username, gid) < 0) | |
607 | return -errno; | |
608 | ||
609 | keep_groups = true; | |
610 | } | |
611 | ||
612 | /* Second step, set our gids */ | |
613 | if (setresgid(gid, gid, gid) < 0) | |
614 | return -errno; | |
615 | } | |
616 | ||
617 | if (context->supplementary_groups) { | |
618 | int ngroups_max, k; | |
619 | gid_t *gids; | |
620 | char **i; | |
621 | ||
622 | /* Final step, initialize any manually set supplementary groups */ | |
623 | assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0); | |
624 | ||
625 | if (!(gids = new(gid_t, ngroups_max))) | |
626 | return -ENOMEM; | |
627 | ||
628 | if (keep_groups) { | |
629 | if ((k = getgroups(ngroups_max, gids)) < 0) { | |
630 | free(gids); | |
631 | return -errno; | |
632 | } | |
633 | } else | |
634 | k = 0; | |
635 | ||
636 | STRV_FOREACH(i, context->supplementary_groups) { | |
637 | const char *g; | |
638 | ||
639 | if (k >= ngroups_max) { | |
640 | free(gids); | |
641 | return -E2BIG; | |
642 | } | |
643 | ||
644 | g = *i; | |
645 | r = get_group_creds(&g, gids+k); | |
646 | if (r < 0) { | |
647 | free(gids); | |
648 | return r; | |
649 | } | |
650 | ||
651 | k++; | |
652 | } | |
653 | ||
654 | if (setgroups(k, gids) < 0) { | |
655 | free(gids); | |
656 | return -errno; | |
657 | } | |
658 | ||
659 | free(gids); | |
660 | } | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
665 | static int enforce_user(const ExecContext *context, uid_t uid) { | |
663996b3 MS |
666 | assert(context); |
667 | ||
668 | /* Sets (but doesn't lookup) the uid and make sure we keep the | |
669 | * capabilities while doing so. */ | |
670 | ||
671 | if (context->capabilities) { | |
60f067b4 | 672 | _cleanup_cap_free_ cap_t d = NULL; |
663996b3 MS |
673 | static const cap_value_t bits[] = { |
674 | CAP_SETUID, /* Necessary so that we can run setresuid() below */ | |
675 | CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */ | |
676 | }; | |
677 | ||
678 | /* First step: If we need to keep capabilities but | |
679 | * drop privileges we need to make sure we keep our | |
680 | * caps, while we drop privileges. */ | |
681 | if (uid != 0) { | |
682 | int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS; | |
683 | ||
684 | if (prctl(PR_GET_SECUREBITS) != sb) | |
685 | if (prctl(PR_SET_SECUREBITS, sb) < 0) | |
686 | return -errno; | |
687 | } | |
688 | ||
689 | /* Second step: set the capabilities. This will reduce | |
690 | * the capabilities to the minimum we need. */ | |
691 | ||
60f067b4 JS |
692 | d = cap_dup(context->capabilities); |
693 | if (!d) | |
663996b3 MS |
694 | return -errno; |
695 | ||
696 | if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 || | |
60f067b4 JS |
697 | cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) |
698 | return -errno; | |
663996b3 | 699 | |
60f067b4 JS |
700 | if (cap_set_proc(d) < 0) |
701 | return -errno; | |
663996b3 MS |
702 | } |
703 | ||
704 | /* Third step: actually set the uids */ | |
705 | if (setresuid(uid, uid, uid) < 0) | |
706 | return -errno; | |
707 | ||
708 | /* At this point we should have all necessary capabilities but | |
709 | are otherwise a normal user. However, the caps might got | |
710 | corrupted due to the setresuid() so we need clean them up | |
711 | later. This is done outside of this call. */ | |
712 | ||
713 | return 0; | |
714 | } | |
715 | ||
716 | #ifdef HAVE_PAM | |
717 | ||
718 | static int null_conv( | |
719 | int num_msg, | |
720 | const struct pam_message **msg, | |
721 | struct pam_response **resp, | |
722 | void *appdata_ptr) { | |
723 | ||
724 | /* We don't support conversations */ | |
725 | ||
726 | return PAM_CONV_ERR; | |
727 | } | |
728 | ||
729 | static int setup_pam( | |
730 | const char *name, | |
731 | const char *user, | |
732 | uid_t uid, | |
733 | const char *tty, | |
734 | char ***pam_env, | |
735 | int fds[], unsigned n_fds) { | |
736 | ||
737 | static const struct pam_conv conv = { | |
738 | .conv = null_conv, | |
739 | .appdata_ptr = NULL | |
740 | }; | |
741 | ||
742 | pam_handle_t *handle = NULL; | |
743 | sigset_t ss, old_ss; | |
744 | int pam_code = PAM_SUCCESS; | |
745 | int err; | |
746 | char **e = NULL; | |
747 | bool close_session = false; | |
748 | pid_t pam_pid = 0, parent_pid; | |
60f067b4 | 749 | int flags = 0; |
663996b3 MS |
750 | |
751 | assert(name); | |
752 | assert(user); | |
753 | assert(pam_env); | |
754 | ||
755 | /* We set up PAM in the parent process, then fork. The child | |
756 | * will then stay around until killed via PR_GET_PDEATHSIG or | |
757 | * systemd via the cgroup logic. It will then remove the PAM | |
758 | * session again. The parent process will exec() the actual | |
759 | * daemon. We do things this way to ensure that the main PID | |
760 | * of the daemon is the one we initially fork()ed. */ | |
761 | ||
60f067b4 JS |
762 | if (log_get_max_level() < LOG_PRI(LOG_DEBUG)) |
763 | flags |= PAM_SILENT; | |
764 | ||
14228c0d MB |
765 | pam_code = pam_start(name, user, &conv, &handle); |
766 | if (pam_code != PAM_SUCCESS) { | |
663996b3 MS |
767 | handle = NULL; |
768 | goto fail; | |
769 | } | |
770 | ||
14228c0d MB |
771 | if (tty) { |
772 | pam_code = pam_set_item(handle, PAM_TTY, tty); | |
773 | if (pam_code != PAM_SUCCESS) | |
663996b3 | 774 | goto fail; |
14228c0d | 775 | } |
663996b3 | 776 | |
60f067b4 | 777 | pam_code = pam_acct_mgmt(handle, flags); |
14228c0d | 778 | if (pam_code != PAM_SUCCESS) |
663996b3 MS |
779 | goto fail; |
780 | ||
60f067b4 | 781 | pam_code = pam_open_session(handle, flags); |
14228c0d | 782 | if (pam_code != PAM_SUCCESS) |
663996b3 MS |
783 | goto fail; |
784 | ||
785 | close_session = true; | |
786 | ||
14228c0d MB |
787 | e = pam_getenvlist(handle); |
788 | if (!e) { | |
663996b3 MS |
789 | pam_code = PAM_BUF_ERR; |
790 | goto fail; | |
791 | } | |
792 | ||
793 | /* Block SIGTERM, so that we know that it won't get lost in | |
794 | * the child */ | |
795 | if (sigemptyset(&ss) < 0 || | |
796 | sigaddset(&ss, SIGTERM) < 0 || | |
797 | sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0) | |
798 | goto fail; | |
799 | ||
800 | parent_pid = getpid(); | |
801 | ||
14228c0d MB |
802 | pam_pid = fork(); |
803 | if (pam_pid < 0) | |
663996b3 MS |
804 | goto fail; |
805 | ||
806 | if (pam_pid == 0) { | |
807 | int sig; | |
808 | int r = EXIT_PAM; | |
809 | ||
810 | /* The child's job is to reset the PAM session on | |
811 | * termination */ | |
812 | ||
813 | /* This string must fit in 10 chars (i.e. the length | |
814 | * of "/sbin/init"), to look pretty in /bin/ps */ | |
815 | rename_process("(sd-pam)"); | |
816 | ||
817 | /* Make sure we don't keep open the passed fds in this | |
818 | child. We assume that otherwise only those fds are | |
819 | open here that have been opened by PAM. */ | |
820 | close_many(fds, n_fds); | |
821 | ||
822 | /* Drop privileges - we don't need any to pam_close_session | |
823 | * and this will make PR_SET_PDEATHSIG work in most cases. | |
824 | * If this fails, ignore the error - but expect sd-pam threads | |
825 | * to fail to exit normally */ | |
826 | if (setresuid(uid, uid, uid) < 0) | |
f47781d8 | 827 | log_error_errno(r, "Error: Failed to setresuid() in sd-pam: %m"); |
663996b3 MS |
828 | |
829 | /* Wait until our parent died. This will only work if | |
830 | * the above setresuid() succeeds, otherwise the kernel | |
831 | * will not allow unprivileged parents kill their privileged | |
832 | * children this way. We rely on the control groups kill logic | |
833 | * to do the rest for us. */ | |
834 | if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) | |
835 | goto child_finish; | |
836 | ||
837 | /* Check if our parent process might already have | |
838 | * died? */ | |
839 | if (getppid() == parent_pid) { | |
840 | for (;;) { | |
841 | if (sigwait(&ss, &sig) < 0) { | |
842 | if (errno == EINTR) | |
843 | continue; | |
844 | ||
845 | goto child_finish; | |
846 | } | |
847 | ||
848 | assert(sig == SIGTERM); | |
849 | break; | |
850 | } | |
851 | } | |
852 | ||
853 | /* If our parent died we'll end the session */ | |
14228c0d | 854 | if (getppid() != parent_pid) { |
60f067b4 | 855 | pam_code = pam_close_session(handle, flags); |
14228c0d | 856 | if (pam_code != PAM_SUCCESS) |
663996b3 | 857 | goto child_finish; |
14228c0d | 858 | } |
663996b3 MS |
859 | |
860 | r = 0; | |
861 | ||
862 | child_finish: | |
60f067b4 | 863 | pam_end(handle, pam_code | flags); |
663996b3 MS |
864 | _exit(r); |
865 | } | |
866 | ||
867 | /* If the child was forked off successfully it will do all the | |
868 | * cleanups, so forget about the handle here. */ | |
869 | handle = NULL; | |
870 | ||
871 | /* Unblock SIGTERM again in the parent */ | |
872 | if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0) | |
873 | goto fail; | |
874 | ||
875 | /* We close the log explicitly here, since the PAM modules | |
876 | * might have opened it, but we don't want this fd around. */ | |
877 | closelog(); | |
878 | ||
879 | *pam_env = e; | |
880 | e = NULL; | |
881 | ||
882 | return 0; | |
883 | ||
884 | fail: | |
60f067b4 JS |
885 | if (pam_code != PAM_SUCCESS) { |
886 | log_error("PAM failed: %s", pam_strerror(handle, pam_code)); | |
663996b3 | 887 | err = -EPERM; /* PAM errors do not map to errno */ |
60f067b4 | 888 | } else { |
f47781d8 | 889 | log_error_errno(errno, "PAM failed: %m"); |
663996b3 | 890 | err = -errno; |
60f067b4 | 891 | } |
663996b3 MS |
892 | |
893 | if (handle) { | |
894 | if (close_session) | |
60f067b4 | 895 | pam_code = pam_close_session(handle, flags); |
663996b3 | 896 | |
60f067b4 | 897 | pam_end(handle, pam_code | flags); |
663996b3 MS |
898 | } |
899 | ||
900 | strv_free(e); | |
901 | ||
902 | closelog(); | |
903 | ||
904 | if (pam_pid > 1) { | |
905 | kill(pam_pid, SIGTERM); | |
906 | kill(pam_pid, SIGCONT); | |
907 | } | |
908 | ||
909 | return err; | |
910 | } | |
911 | #endif | |
912 | ||
913 | static void rename_process_from_path(const char *path) { | |
914 | char process_name[11]; | |
915 | const char *p; | |
916 | size_t l; | |
917 | ||
918 | /* This resulting string must fit in 10 chars (i.e. the length | |
919 | * of "/sbin/init") to look pretty in /bin/ps */ | |
920 | ||
60f067b4 | 921 | p = basename(path); |
663996b3 MS |
922 | if (isempty(p)) { |
923 | rename_process("(...)"); | |
924 | return; | |
925 | } | |
926 | ||
927 | l = strlen(p); | |
928 | if (l > 8) { | |
929 | /* The end of the process name is usually more | |
930 | * interesting, since the first bit might just be | |
931 | * "systemd-" */ | |
932 | p = p + l - 8; | |
933 | l = 8; | |
934 | } | |
935 | ||
936 | process_name[0] = '('; | |
937 | memcpy(process_name+1, p, l); | |
938 | process_name[1+l] = ')'; | |
939 | process_name[1+l+1] = 0; | |
940 | ||
941 | rename_process(process_name); | |
942 | } | |
943 | ||
60f067b4 JS |
944 | #ifdef HAVE_SECCOMP |
945 | ||
5eef597e | 946 | static int apply_seccomp(const ExecContext *c) { |
60f067b4 JS |
947 | uint32_t negative_action, action; |
948 | scmp_filter_ctx *seccomp; | |
949 | Iterator i; | |
950 | void *id; | |
951 | int r; | |
663996b3 | 952 | |
60f067b4 | 953 | assert(c); |
663996b3 | 954 | |
60f067b4 | 955 | negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno); |
663996b3 | 956 | |
60f067b4 JS |
957 | seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW); |
958 | if (!seccomp) | |
959 | return -ENOMEM; | |
663996b3 | 960 | |
60f067b4 | 961 | if (c->syscall_archs) { |
663996b3 | 962 | |
60f067b4 JS |
963 | SET_FOREACH(id, c->syscall_archs, i) { |
964 | r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1); | |
965 | if (r == -EEXIST) | |
966 | continue; | |
967 | if (r < 0) | |
968 | goto finish; | |
969 | } | |
663996b3 | 970 | |
60f067b4 JS |
971 | } else { |
972 | r = seccomp_add_secondary_archs(seccomp); | |
973 | if (r < 0) | |
974 | goto finish; | |
975 | } | |
663996b3 | 976 | |
60f067b4 JS |
977 | action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action; |
978 | SET_FOREACH(id, c->syscall_filter, i) { | |
979 | r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0); | |
980 | if (r < 0) | |
981 | goto finish; | |
982 | } | |
663996b3 | 983 | |
60f067b4 JS |
984 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); |
985 | if (r < 0) | |
986 | goto finish; | |
987 | ||
988 | r = seccomp_load(seccomp); | |
989 | ||
990 | finish: | |
991 | seccomp_release(seccomp); | |
992 | return r; | |
993 | } | |
994 | ||
5eef597e | 995 | static int apply_address_families(const ExecContext *c) { |
60f067b4 JS |
996 | scmp_filter_ctx *seccomp; |
997 | Iterator i; | |
998 | int r; | |
999 | ||
1000 | assert(c); | |
1001 | ||
1002 | seccomp = seccomp_init(SCMP_ACT_ALLOW); | |
1003 | if (!seccomp) | |
1004 | return -ENOMEM; | |
1005 | ||
1006 | r = seccomp_add_secondary_archs(seccomp); | |
1007 | if (r < 0) | |
1008 | goto finish; | |
1009 | ||
1010 | if (c->address_families_whitelist) { | |
1011 | int af, first = 0, last = 0; | |
1012 | void *afp; | |
1013 | ||
1014 | /* If this is a whitelist, we first block the address | |
1015 | * families that are out of range and then everything | |
1016 | * that is not in the set. First, we find the lowest | |
1017 | * and highest address family in the set. */ | |
1018 | ||
1019 | SET_FOREACH(afp, c->address_families, i) { | |
1020 | af = PTR_TO_INT(afp); | |
1021 | ||
1022 | if (af <= 0 || af >= af_max()) | |
1023 | continue; | |
1024 | ||
1025 | if (first == 0 || af < first) | |
1026 | first = af; | |
1027 | ||
1028 | if (last == 0 || af > last) | |
1029 | last = af; | |
663996b3 MS |
1030 | } |
1031 | ||
60f067b4 | 1032 | assert((first == 0) == (last == 0)); |
663996b3 | 1033 | |
60f067b4 | 1034 | if (first == 0) { |
663996b3 | 1035 | |
60f067b4 JS |
1036 | /* No entries in the valid range, block everything */ |
1037 | r = seccomp_rule_add( | |
1038 | seccomp, | |
1039 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1040 | SCMP_SYS(socket), | |
1041 | 0); | |
1042 | if (r < 0) | |
1043 | goto finish; | |
1044 | ||
1045 | } else { | |
1046 | ||
1047 | /* Block everything below the first entry */ | |
1048 | r = seccomp_rule_add( | |
1049 | seccomp, | |
1050 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1051 | SCMP_SYS(socket), | |
1052 | 1, | |
1053 | SCMP_A0(SCMP_CMP_LT, first)); | |
1054 | if (r < 0) | |
1055 | goto finish; | |
1056 | ||
1057 | /* Block everything above the last entry */ | |
1058 | r = seccomp_rule_add( | |
1059 | seccomp, | |
1060 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1061 | SCMP_SYS(socket), | |
1062 | 1, | |
1063 | SCMP_A0(SCMP_CMP_GT, last)); | |
1064 | if (r < 0) | |
1065 | goto finish; | |
1066 | ||
1067 | /* Block everything between the first and last | |
1068 | * entry */ | |
1069 | for (af = 1; af < af_max(); af++) { | |
1070 | ||
1071 | if (set_contains(c->address_families, INT_TO_PTR(af))) | |
1072 | continue; | |
1073 | ||
1074 | r = seccomp_rule_add( | |
1075 | seccomp, | |
1076 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1077 | SCMP_SYS(socket), | |
1078 | 1, | |
1079 | SCMP_A0(SCMP_CMP_EQ, af)); | |
1080 | if (r < 0) | |
1081 | goto finish; | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | } else { | |
1086 | void *af; | |
1087 | ||
1088 | /* If this is a blacklist, then generate one rule for | |
1089 | * each address family that are then combined in OR | |
1090 | * checks. */ | |
1091 | ||
1092 | SET_FOREACH(af, c->address_families, i) { | |
1093 | ||
1094 | r = seccomp_rule_add( | |
1095 | seccomp, | |
1096 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1097 | SCMP_SYS(socket), | |
1098 | 1, | |
1099 | SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af))); | |
1100 | if (r < 0) | |
1101 | goto finish; | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1106 | if (r < 0) | |
1107 | goto finish; | |
1108 | ||
1109 | r = seccomp_load(seccomp); | |
1110 | ||
1111 | finish: | |
1112 | seccomp_release(seccomp); | |
1113 | return r; | |
663996b3 MS |
1114 | } |
1115 | ||
60f067b4 JS |
1116 | #endif |
1117 | ||
14228c0d MB |
1118 | static void do_idle_pipe_dance(int idle_pipe[4]) { |
1119 | assert(idle_pipe); | |
1120 | ||
60f067b4 JS |
1121 | |
1122 | safe_close(idle_pipe[1]); | |
1123 | safe_close(idle_pipe[2]); | |
14228c0d MB |
1124 | |
1125 | if (idle_pipe[0] >= 0) { | |
1126 | int r; | |
1127 | ||
1128 | r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC); | |
1129 | ||
1130 | if (idle_pipe[3] >= 0 && r == 0 /* timeout */) { | |
1131 | /* Signal systemd that we are bored and want to continue. */ | |
1132 | write(idle_pipe[3], "x", 1); | |
1133 | ||
1134 | /* Wait for systemd to react to the signal above. */ | |
1135 | fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC); | |
1136 | } | |
1137 | ||
60f067b4 JS |
1138 | safe_close(idle_pipe[0]); |
1139 | ||
1140 | } | |
1141 | ||
1142 | safe_close(idle_pipe[3]); | |
1143 | } | |
1144 | ||
1145 | static int build_environment( | |
5eef597e | 1146 | const ExecContext *c, |
60f067b4 JS |
1147 | unsigned n_fds, |
1148 | usec_t watchdog_usec, | |
1149 | const char *home, | |
1150 | const char *username, | |
1151 | const char *shell, | |
1152 | char ***ret) { | |
1153 | ||
1154 | _cleanup_strv_free_ char **our_env = NULL; | |
1155 | unsigned n_env = 0; | |
1156 | char *x; | |
14228c0d | 1157 | |
60f067b4 JS |
1158 | assert(c); |
1159 | assert(ret); | |
1160 | ||
1161 | our_env = new0(char*, 10); | |
1162 | if (!our_env) | |
1163 | return -ENOMEM; | |
1164 | ||
1165 | if (n_fds > 0) { | |
1166 | if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0) | |
1167 | return -ENOMEM; | |
1168 | our_env[n_env++] = x; | |
1169 | ||
1170 | if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0) | |
1171 | return -ENOMEM; | |
1172 | our_env[n_env++] = x; | |
1173 | } | |
1174 | ||
1175 | if (watchdog_usec > 0) { | |
1176 | if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0) | |
1177 | return -ENOMEM; | |
1178 | our_env[n_env++] = x; | |
1179 | ||
1180 | if (asprintf(&x, "WATCHDOG_USEC="USEC_FMT, watchdog_usec) < 0) | |
1181 | return -ENOMEM; | |
1182 | our_env[n_env++] = x; | |
1183 | } | |
1184 | ||
1185 | if (home) { | |
1186 | x = strappend("HOME=", home); | |
1187 | if (!x) | |
1188 | return -ENOMEM; | |
1189 | our_env[n_env++] = x; | |
1190 | } | |
1191 | ||
1192 | if (username) { | |
1193 | x = strappend("LOGNAME=", username); | |
1194 | if (!x) | |
1195 | return -ENOMEM; | |
1196 | our_env[n_env++] = x; | |
1197 | ||
1198 | x = strappend("USER=", username); | |
1199 | if (!x) | |
1200 | return -ENOMEM; | |
1201 | our_env[n_env++] = x; | |
1202 | } | |
1203 | ||
1204 | if (shell) { | |
1205 | x = strappend("SHELL=", shell); | |
1206 | if (!x) | |
1207 | return -ENOMEM; | |
1208 | our_env[n_env++] = x; | |
1209 | } | |
1210 | ||
1211 | if (is_terminal_input(c->std_input) || | |
1212 | c->std_output == EXEC_OUTPUT_TTY || | |
1213 | c->std_error == EXEC_OUTPUT_TTY || | |
1214 | c->tty_path) { | |
1215 | ||
1216 | x = strdup(default_term_for_tty(tty_path(c))); | |
1217 | if (!x) | |
1218 | return -ENOMEM; | |
1219 | our_env[n_env++] = x; | |
14228c0d MB |
1220 | } |
1221 | ||
60f067b4 JS |
1222 | our_env[n_env++] = NULL; |
1223 | assert(n_env <= 10); | |
1224 | ||
1225 | *ret = our_env; | |
1226 | our_env = NULL; | |
1227 | ||
1228 | return 0; | |
14228c0d MB |
1229 | } |
1230 | ||
5eef597e MP |
1231 | static int exec_child(ExecCommand *command, |
1232 | const ExecContext *context, | |
1233 | const ExecParameters *params, | |
1234 | ExecRuntime *runtime, | |
1235 | char **argv, | |
1236 | int socket_fd, | |
1237 | int *fds, unsigned n_fds, | |
1238 | char **files_env, | |
1239 | int *error) { | |
1240 | ||
1241 | _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL; | |
f47781d8 | 1242 | _cleanup_free_ char *mac_selinux_context_net = NULL; |
5eef597e MP |
1243 | const char *username = NULL, *home = NULL, *shell = NULL; |
1244 | unsigned n_dont_close = 0; | |
1245 | int dont_close[n_fds + 4]; | |
f47781d8 MP |
1246 | uid_t uid = UID_INVALID; |
1247 | gid_t gid = GID_INVALID; | |
5eef597e | 1248 | int i, err; |
663996b3 MS |
1249 | |
1250 | assert(command); | |
1251 | assert(context); | |
5eef597e MP |
1252 | assert(params); |
1253 | assert(error); | |
1254 | ||
1255 | rename_process_from_path(command->path); | |
1256 | ||
1257 | /* We reset exactly these signals, since they are the | |
1258 | * only ones we set to SIG_IGN in the main daemon. All | |
1259 | * others we leave untouched because we set them to | |
1260 | * SIG_DFL or a valid handler initially, both of which | |
1261 | * will be demoted to SIG_DFL. */ | |
1262 | default_signals(SIGNALS_CRASH_HANDLER, | |
1263 | SIGNALS_IGNORE, -1); | |
1264 | ||
1265 | if (context->ignore_sigpipe) | |
1266 | ignore_signals(SIGPIPE, -1); | |
1267 | ||
1268 | err = reset_signal_mask(); | |
1269 | if (err < 0) { | |
1270 | *error = EXIT_SIGNAL_MASK; | |
1271 | return err; | |
1272 | } | |
663996b3 | 1273 | |
5eef597e MP |
1274 | if (params->idle_pipe) |
1275 | do_idle_pipe_dance(params->idle_pipe); | |
663996b3 | 1276 | |
5eef597e MP |
1277 | /* Close sockets very early to make sure we don't |
1278 | * block init reexecution because it cannot bind its | |
1279 | * sockets */ | |
1280 | log_forget_fds(); | |
663996b3 | 1281 | |
5eef597e MP |
1282 | if (socket_fd >= 0) |
1283 | dont_close[n_dont_close++] = socket_fd; | |
1284 | if (n_fds > 0) { | |
1285 | memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds); | |
1286 | n_dont_close += n_fds; | |
1287 | } | |
1288 | if (params->bus_endpoint_fd >= 0) | |
1289 | dont_close[n_dont_close++] = params->bus_endpoint_fd; | |
1290 | if (runtime) { | |
1291 | if (runtime->netns_storage_socket[0] >= 0) | |
1292 | dont_close[n_dont_close++] = runtime->netns_storage_socket[0]; | |
1293 | if (runtime->netns_storage_socket[1] >= 0) | |
1294 | dont_close[n_dont_close++] = runtime->netns_storage_socket[1]; | |
1295 | } | |
663996b3 | 1296 | |
5eef597e MP |
1297 | err = close_all_fds(dont_close, n_dont_close); |
1298 | if (err < 0) { | |
1299 | *error = EXIT_FDS; | |
1300 | return err; | |
1301 | } | |
663996b3 | 1302 | |
5eef597e MP |
1303 | if (!context->same_pgrp) |
1304 | if (setsid() < 0) { | |
1305 | *error = EXIT_SETSID; | |
1306 | return -errno; | |
1307 | } | |
1308 | ||
1309 | exec_context_tty_reset(context); | |
1310 | ||
1311 | if (params->confirm_spawn) { | |
1312 | char response; | |
1313 | ||
1314 | err = ask_for_confirmation(&response, argv); | |
1315 | if (err == -ETIMEDOUT) | |
1316 | write_confirm_message("Confirmation question timed out, assuming positive response.\n"); | |
1317 | else if (err < 0) | |
1318 | write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-err)); | |
1319 | else if (response == 's') { | |
1320 | write_confirm_message("Skipping execution.\n"); | |
1321 | *error = EXIT_CONFIRM; | |
1322 | return -ECANCELED; | |
1323 | } else if (response == 'n') { | |
1324 | write_confirm_message("Failing execution.\n"); | |
1325 | *error = 0; | |
1326 | return 0; | |
1327 | } | |
663996b3 MS |
1328 | } |
1329 | ||
5eef597e MP |
1330 | /* If a socket is connected to STDIN/STDOUT/STDERR, we |
1331 | * must sure to drop O_NONBLOCK */ | |
1332 | if (socket_fd >= 0) | |
1333 | fd_nonblock(socket_fd, false); | |
663996b3 | 1334 | |
5eef597e MP |
1335 | err = setup_input(context, socket_fd, params->apply_tty_stdin); |
1336 | if (err < 0) { | |
1337 | *error = EXIT_STDIN; | |
1338 | return err; | |
1339 | } | |
663996b3 | 1340 | |
5eef597e MP |
1341 | err = setup_output(context, STDOUT_FILENO, socket_fd, basename(command->path), params->unit_id, params->apply_tty_stdin); |
1342 | if (err < 0) { | |
1343 | *error = EXIT_STDOUT; | |
1344 | return err; | |
1345 | } | |
663996b3 | 1346 | |
5eef597e MP |
1347 | err = setup_output(context, STDERR_FILENO, socket_fd, basename(command->path), params->unit_id, params->apply_tty_stdin); |
1348 | if (err < 0) { | |
1349 | *error = EXIT_STDERR; | |
1350 | return err; | |
1351 | } | |
663996b3 | 1352 | |
5eef597e | 1353 | if (params->cgroup_path) { |
f47781d8 | 1354 | err = cg_attach_everywhere(params->cgroup_supported, params->cgroup_path, 0, NULL, NULL); |
5eef597e MP |
1355 | if (err < 0) { |
1356 | *error = EXIT_CGROUP; | |
1357 | return err; | |
663996b3 | 1358 | } |
5eef597e | 1359 | } |
663996b3 | 1360 | |
5eef597e MP |
1361 | if (context->oom_score_adjust_set) { |
1362 | char t[16]; | |
663996b3 | 1363 | |
5eef597e MP |
1364 | snprintf(t, sizeof(t), "%i", context->oom_score_adjust); |
1365 | char_array_0(t); | |
60f067b4 | 1366 | |
5eef597e MP |
1367 | if (write_string_file("/proc/self/oom_score_adj", t) < 0) { |
1368 | *error = EXIT_OOM_ADJUST; | |
1369 | return -errno; | |
60f067b4 | 1370 | } |
5eef597e | 1371 | } |
60f067b4 | 1372 | |
5eef597e MP |
1373 | if (context->nice_set) |
1374 | if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) { | |
1375 | *error = EXIT_NICE; | |
1376 | return -errno; | |
663996b3 MS |
1377 | } |
1378 | ||
5eef597e MP |
1379 | if (context->cpu_sched_set) { |
1380 | struct sched_param param = { | |
1381 | .sched_priority = context->cpu_sched_priority, | |
1382 | }; | |
663996b3 | 1383 | |
5eef597e MP |
1384 | err = sched_setscheduler(0, |
1385 | context->cpu_sched_policy | | |
1386 | (context->cpu_sched_reset_on_fork ? | |
1387 | SCHED_RESET_ON_FORK : 0), | |
1388 | ¶m); | |
1389 | if (err < 0) { | |
1390 | *error = EXIT_SETSCHEDULER; | |
1391 | return -errno; | |
1392 | } | |
1393 | } | |
663996b3 | 1394 | |
5eef597e MP |
1395 | if (context->cpuset) |
1396 | if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) { | |
1397 | *error = EXIT_CPUAFFINITY; | |
1398 | return -errno; | |
663996b3 MS |
1399 | } |
1400 | ||
5eef597e MP |
1401 | if (context->ioprio_set) |
1402 | if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) { | |
1403 | *error = EXIT_IOPRIO; | |
1404 | return -errno; | |
1405 | } | |
663996b3 | 1406 | |
5eef597e MP |
1407 | if (context->timer_slack_nsec != NSEC_INFINITY) |
1408 | if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) { | |
1409 | *error = EXIT_TIMERSLACK; | |
1410 | return -errno; | |
663996b3 MS |
1411 | } |
1412 | ||
5eef597e MP |
1413 | if (context->personality != 0xffffffffUL) |
1414 | if (personality(context->personality) < 0) { | |
1415 | *error = EXIT_PERSONALITY; | |
1416 | return -errno; | |
663996b3 MS |
1417 | } |
1418 | ||
5eef597e MP |
1419 | if (context->utmp_id) |
1420 | utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path); | |
1421 | ||
1422 | if (context->user) { | |
1423 | username = context->user; | |
1424 | err = get_user_creds(&username, &uid, &gid, &home, &shell); | |
663996b3 | 1425 | if (err < 0) { |
5eef597e MP |
1426 | *error = EXIT_USER; |
1427 | return err; | |
663996b3 MS |
1428 | } |
1429 | ||
5eef597e MP |
1430 | if (is_terminal_input(context->std_input)) { |
1431 | err = chown_terminal(STDIN_FILENO, uid); | |
663996b3 | 1432 | if (err < 0) { |
5eef597e MP |
1433 | *error = EXIT_STDIN; |
1434 | return err; | |
663996b3 MS |
1435 | } |
1436 | } | |
5eef597e | 1437 | } |
663996b3 | 1438 | |
5eef597e MP |
1439 | #ifdef ENABLE_KDBUS |
1440 | if (params->bus_endpoint_fd >= 0 && context->bus_endpoint) { | |
f47781d8 | 1441 | uid_t ep_uid = (uid == UID_INVALID) ? 0 : uid; |
663996b3 | 1442 | |
5eef597e MP |
1443 | err = bus_kernel_set_endpoint_policy(params->bus_endpoint_fd, ep_uid, context->bus_endpoint); |
1444 | if (err < 0) { | |
1445 | *error = EXIT_BUS_ENDPOINT; | |
1446 | return err; | |
663996b3 | 1447 | } |
5eef597e MP |
1448 | } |
1449 | #endif | |
663996b3 | 1450 | |
f47781d8 MP |
1451 | /* If delegation is enabled we'll pass ownership of the cgroup |
1452 | * (but only in systemd's own controller hierarchy!) to the | |
1453 | * user of the new process. */ | |
1454 | if (params->cgroup_path && context->user && params->cgroup_delegate) { | |
5eef597e MP |
1455 | err = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0644, uid, gid); |
1456 | if (err < 0) { | |
1457 | *error = EXIT_CGROUP; | |
1458 | return err; | |
1459 | } | |
663996b3 | 1460 | |
663996b3 | 1461 | |
5eef597e MP |
1462 | err = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0755, uid, gid); |
1463 | if (err < 0) { | |
1464 | *error = EXIT_CGROUP; | |
1465 | return err; | |
663996b3 | 1466 | } |
5eef597e | 1467 | } |
663996b3 | 1468 | |
5eef597e MP |
1469 | if (!strv_isempty(context->runtime_directory) && params->runtime_prefix) { |
1470 | char **rt; | |
663996b3 | 1471 | |
5eef597e MP |
1472 | STRV_FOREACH(rt, context->runtime_directory) { |
1473 | _cleanup_free_ char *p; | |
663996b3 | 1474 | |
5eef597e MP |
1475 | p = strjoin(params->runtime_prefix, "/", *rt, NULL); |
1476 | if (!p) { | |
1477 | *error = EXIT_RUNTIME_DIRECTORY; | |
1478 | return -ENOMEM; | |
60f067b4 JS |
1479 | } |
1480 | ||
5eef597e | 1481 | err = mkdir_safe(p, context->runtime_directory_mode, uid, gid); |
663996b3 | 1482 | if (err < 0) { |
5eef597e MP |
1483 | *error = EXIT_RUNTIME_DIRECTORY; |
1484 | return err; | |
663996b3 | 1485 | } |
14228c0d | 1486 | } |
5eef597e | 1487 | } |
663996b3 | 1488 | |
5eef597e MP |
1489 | if (params->apply_permissions) { |
1490 | err = enforce_groups(context, username, gid); | |
1491 | if (err < 0) { | |
1492 | *error = EXIT_GROUP; | |
1493 | return err; | |
1494 | } | |
1495 | } | |
663996b3 | 1496 | |
5eef597e | 1497 | umask(context->umask); |
14228c0d | 1498 | |
5eef597e MP |
1499 | #ifdef HAVE_PAM |
1500 | if (params->apply_permissions && context->pam_name && username) { | |
1501 | err = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds); | |
1502 | if (err < 0) { | |
1503 | *error = EXIT_PAM; | |
1504 | return err; | |
663996b3 | 1505 | } |
5eef597e | 1506 | } |
14228c0d | 1507 | #endif |
663996b3 | 1508 | |
5eef597e MP |
1509 | if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) { |
1510 | err = setup_netns(runtime->netns_storage_socket); | |
1511 | if (err < 0) { | |
1512 | *error = EXIT_NETWORK; | |
1513 | return err; | |
1514 | } | |
1515 | } | |
60f067b4 | 1516 | |
5eef597e MP |
1517 | if (!strv_isempty(context->read_write_dirs) || |
1518 | !strv_isempty(context->read_only_dirs) || | |
1519 | !strv_isempty(context->inaccessible_dirs) || | |
1520 | context->mount_flags != 0 || | |
1521 | (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) || | |
1522 | params->bus_endpoint_path || | |
1523 | context->private_devices || | |
1524 | context->protect_system != PROTECT_SYSTEM_NO || | |
1525 | context->protect_home != PROTECT_HOME_NO) { | |
1526 | ||
1527 | char *tmp = NULL, *var = NULL; | |
1528 | ||
1529 | /* The runtime struct only contains the parent | |
1530 | * of the private /tmp, which is | |
1531 | * non-accessible to world users. Inside of it | |
1532 | * there's a /tmp that is sticky, and that's | |
1533 | * the one we want to use here. */ | |
1534 | ||
1535 | if (context->private_tmp && runtime) { | |
1536 | if (runtime->tmp_dir) | |
1537 | tmp = strappenda(runtime->tmp_dir, "/tmp"); | |
1538 | if (runtime->var_tmp_dir) | |
1539 | var = strappenda(runtime->var_tmp_dir, "/tmp"); | |
1540 | } | |
60f067b4 | 1541 | |
5eef597e MP |
1542 | err = setup_namespace( |
1543 | context->read_write_dirs, | |
1544 | context->read_only_dirs, | |
1545 | context->inaccessible_dirs, | |
1546 | tmp, | |
1547 | var, | |
1548 | params->bus_endpoint_path, | |
1549 | context->private_devices, | |
1550 | context->protect_home, | |
1551 | context->protect_system, | |
1552 | context->mount_flags); | |
1553 | ||
1554 | if (err == -EPERM) | |
f47781d8 | 1555 | log_unit_warning_errno(params->unit_id, err, "Failed to set up file system namespace due to lack of privileges. Execution sandbox will not be in effect: %m"); |
5eef597e MP |
1556 | else if (err < 0) { |
1557 | *error = EXIT_NAMESPACE; | |
1558 | return err; | |
1559 | } | |
1560 | } | |
60f067b4 | 1561 | |
5eef597e MP |
1562 | if (params->apply_chroot) { |
1563 | if (context->root_directory) | |
1564 | if (chroot(context->root_directory) < 0) { | |
1565 | *error = EXIT_CHROOT; | |
1566 | return -errno; | |
60f067b4 | 1567 | } |
5eef597e MP |
1568 | |
1569 | if (chdir(context->working_directory ? context->working_directory : "/") < 0) { | |
1570 | *error = EXIT_CHDIR; | |
1571 | return -errno; | |
60f067b4 | 1572 | } |
5eef597e MP |
1573 | } else { |
1574 | _cleanup_free_ char *d = NULL; | |
60f067b4 | 1575 | |
5eef597e MP |
1576 | if (asprintf(&d, "%s/%s", |
1577 | context->root_directory ? context->root_directory : "", | |
1578 | context->working_directory ? context->working_directory : "") < 0) { | |
1579 | *error = EXIT_MEMORY; | |
1580 | return -ENOMEM; | |
663996b3 MS |
1581 | } |
1582 | ||
5eef597e MP |
1583 | if (chdir(d) < 0) { |
1584 | *error = EXIT_CHDIR; | |
1585 | return -errno; | |
1586 | } | |
1587 | } | |
663996b3 | 1588 | |
f47781d8 MP |
1589 | #ifdef HAVE_SELINUX |
1590 | if (params->apply_permissions && mac_selinux_use() && params->selinux_context_net && socket_fd >= 0) { | |
1591 | err = mac_selinux_get_child_mls_label(socket_fd, command->path, context->selinux_context, &mac_selinux_context_net); | |
1592 | if (err < 0) { | |
1593 | *error = EXIT_SELINUX_CONTEXT; | |
1594 | return err; | |
1595 | } | |
1596 | } | |
1597 | #endif | |
1598 | ||
5eef597e MP |
1599 | /* We repeat the fd closing here, to make sure that |
1600 | * nothing is leaked from the PAM modules. Note that | |
1601 | * we are more aggressive this time since socket_fd | |
1602 | * and the netns fds we don't need anymore. The custom | |
1603 | * endpoint fd was needed to upload the policy and can | |
1604 | * now be closed as well. */ | |
1605 | err = close_all_fds(fds, n_fds); | |
1606 | if (err >= 0) | |
1607 | err = shift_fds(fds, n_fds); | |
1608 | if (err >= 0) | |
1609 | err = flags_fds(fds, n_fds, context->non_blocking); | |
1610 | if (err < 0) { | |
1611 | *error = EXIT_FDS; | |
1612 | return err; | |
1613 | } | |
1614 | ||
1615 | if (params->apply_permissions) { | |
1616 | ||
1617 | for (i = 0; i < _RLIMIT_MAX; i++) { | |
1618 | if (!context->rlimit[i]) | |
1619 | continue; | |
1620 | ||
1621 | if (setrlimit_closest(i, context->rlimit[i]) < 0) { | |
1622 | *error = EXIT_LIMITS; | |
1623 | return -errno; | |
663996b3 MS |
1624 | } |
1625 | } | |
5eef597e MP |
1626 | |
1627 | if (context->capability_bounding_set_drop) { | |
1628 | err = capability_bounding_set_drop(context->capability_bounding_set_drop, false); | |
60f067b4 | 1629 | if (err < 0) { |
5eef597e MP |
1630 | *error = EXIT_CAPABILITIES; |
1631 | return err; | |
663996b3 | 1632 | } |
663996b3 MS |
1633 | } |
1634 | ||
f47781d8 MP |
1635 | #ifdef HAVE_SMACK |
1636 | if (context->smack_process_label) { | |
1637 | err = mac_smack_apply_pid(0, context->smack_process_label); | |
1638 | if (err < 0) { | |
1639 | *error = EXIT_SMACK_PROCESS_LABEL; | |
1640 | return err; | |
1641 | } | |
1642 | } | |
1643 | #endif | |
1644 | ||
5eef597e MP |
1645 | if (context->user) { |
1646 | err = enforce_user(context, uid); | |
663996b3 | 1647 | if (err < 0) { |
5eef597e MP |
1648 | *error = EXIT_USER; |
1649 | return err; | |
663996b3 MS |
1650 | } |
1651 | } | |
1652 | ||
5eef597e MP |
1653 | /* PR_GET_SECUREBITS is not privileged, while |
1654 | * PR_SET_SECUREBITS is. So to suppress | |
1655 | * potential EPERMs we'll try not to call | |
1656 | * PR_SET_SECUREBITS unless necessary. */ | |
1657 | if (prctl(PR_GET_SECUREBITS) != context->secure_bits) | |
1658 | if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) { | |
1659 | *error = EXIT_SECUREBITS; | |
1660 | return -errno; | |
1661 | } | |
663996b3 | 1662 | |
5eef597e MP |
1663 | if (context->capabilities) |
1664 | if (cap_set_proc(context->capabilities) < 0) { | |
1665 | *error = EXIT_CAPABILITIES; | |
1666 | return -errno; | |
663996b3 | 1667 | } |
5eef597e MP |
1668 | |
1669 | if (context->no_new_privileges) | |
1670 | if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) { | |
1671 | *error = EXIT_NO_NEW_PRIVILEGES; | |
1672 | return -errno; | |
663996b3 MS |
1673 | } |
1674 | ||
5eef597e MP |
1675 | #ifdef HAVE_SECCOMP |
1676 | if (context->address_families_whitelist || | |
1677 | !set_isempty(context->address_families)) { | |
1678 | err = apply_address_families(context); | |
1679 | if (err < 0) { | |
1680 | *error = EXIT_ADDRESS_FAMILIES; | |
1681 | return err; | |
663996b3 MS |
1682 | } |
1683 | } | |
1684 | ||
5eef597e MP |
1685 | if (context->syscall_whitelist || |
1686 | !set_isempty(context->syscall_filter) || | |
1687 | !set_isempty(context->syscall_archs)) { | |
1688 | err = apply_seccomp(context); | |
1689 | if (err < 0) { | |
1690 | *error = EXIT_SECCOMP; | |
1691 | return err; | |
1692 | } | |
663996b3 | 1693 | } |
5eef597e | 1694 | #endif |
663996b3 | 1695 | |
5eef597e MP |
1696 | #ifdef HAVE_SELINUX |
1697 | if (mac_selinux_use()) { | |
f47781d8 | 1698 | char *exec_context = mac_selinux_context_net ?: context->selinux_context; |
663996b3 | 1699 | |
f47781d8 MP |
1700 | if (exec_context) { |
1701 | err = setexeccon(exec_context); | |
663996b3 | 1702 | if (err < 0) { |
5eef597e MP |
1703 | *error = EXIT_SELINUX_CONTEXT; |
1704 | return err; | |
663996b3 MS |
1705 | } |
1706 | } | |
5eef597e MP |
1707 | } |
1708 | #endif | |
663996b3 | 1709 | |
5eef597e MP |
1710 | #ifdef HAVE_APPARMOR |
1711 | if (context->apparmor_profile && mac_apparmor_use()) { | |
1712 | err = aa_change_onexec(context->apparmor_profile); | |
1713 | if (err < 0 && !context->apparmor_profile_ignore) { | |
1714 | *error = EXIT_APPARMOR_PROFILE; | |
1715 | return -errno; | |
1716 | } | |
1717 | } | |
1718 | #endif | |
1719 | } | |
663996b3 | 1720 | |
5eef597e MP |
1721 | err = build_environment(context, n_fds, params->watchdog_usec, home, username, shell, &our_env); |
1722 | if (err < 0) { | |
1723 | *error = EXIT_MEMORY; | |
1724 | return err; | |
1725 | } | |
663996b3 | 1726 | |
5eef597e MP |
1727 | final_env = strv_env_merge(5, |
1728 | params->environment, | |
1729 | our_env, | |
1730 | context->environment, | |
1731 | files_env, | |
1732 | pam_env, | |
1733 | NULL); | |
1734 | if (!final_env) { | |
1735 | *error = EXIT_MEMORY; | |
1736 | return -ENOMEM; | |
1737 | } | |
663996b3 | 1738 | |
5eef597e MP |
1739 | final_argv = replace_env_argv(argv, final_env); |
1740 | if (!final_argv) { | |
1741 | *error = EXIT_MEMORY; | |
1742 | return -ENOMEM; | |
1743 | } | |
663996b3 | 1744 | |
5eef597e | 1745 | final_env = strv_env_clean(final_env); |
663996b3 | 1746 | |
5eef597e MP |
1747 | if (_unlikely_(log_get_max_level() >= LOG_PRI(LOG_DEBUG))) { |
1748 | _cleanup_free_ char *line; | |
663996b3 | 1749 | |
5eef597e MP |
1750 | line = exec_command_line(final_argv); |
1751 | if (line) { | |
1752 | log_open(); | |
f47781d8 MP |
1753 | log_unit_struct(params->unit_id, |
1754 | LOG_DEBUG, | |
5eef597e | 1755 | "EXECUTABLE=%s", command->path, |
f47781d8 | 1756 | LOG_MESSAGE("Executing: %s", line), |
5eef597e MP |
1757 | NULL); |
1758 | log_close(); | |
60f067b4 | 1759 | } |
5eef597e MP |
1760 | } |
1761 | execve(command->path, final_argv, final_env); | |
1762 | *error = EXIT_EXEC; | |
1763 | return -errno; | |
1764 | } | |
663996b3 | 1765 | |
5eef597e MP |
1766 | int exec_spawn(ExecCommand *command, |
1767 | const ExecContext *context, | |
1768 | const ExecParameters *params, | |
1769 | ExecRuntime *runtime, | |
1770 | pid_t *ret) { | |
663996b3 | 1771 | |
5eef597e MP |
1772 | _cleanup_strv_free_ char **files_env = NULL; |
1773 | int *fds = NULL; unsigned n_fds = 0; | |
1774 | char *line, **argv; | |
1775 | int socket_fd; | |
1776 | pid_t pid; | |
1777 | int err; | |
663996b3 | 1778 | |
5eef597e MP |
1779 | assert(command); |
1780 | assert(context); | |
1781 | assert(ret); | |
1782 | assert(params); | |
1783 | assert(params->fds || params->n_fds <= 0); | |
663996b3 | 1784 | |
5eef597e MP |
1785 | if (context->std_input == EXEC_INPUT_SOCKET || |
1786 | context->std_output == EXEC_OUTPUT_SOCKET || | |
1787 | context->std_error == EXEC_OUTPUT_SOCKET) { | |
1788 | ||
1789 | if (params->n_fds != 1) | |
1790 | return -EINVAL; | |
1791 | ||
1792 | socket_fd = params->fds[0]; | |
1793 | } else { | |
1794 | socket_fd = -1; | |
1795 | fds = params->fds; | |
1796 | n_fds = params->n_fds; | |
1797 | } | |
1798 | ||
1799 | err = exec_context_load_environment(context, params->unit_id, &files_env); | |
1800 | if (err < 0) { | |
f47781d8 MP |
1801 | log_unit_struct(params->unit_id, |
1802 | LOG_ERR, | |
1803 | LOG_MESSAGE("Failed to load environment files: %s", strerror(-err)), | |
1804 | LOG_ERRNO(-err), | |
1805 | NULL); | |
5eef597e MP |
1806 | return err; |
1807 | } | |
1808 | ||
1809 | argv = params->argv ?: command->argv; | |
1810 | ||
1811 | line = exec_command_line(argv); | |
1812 | if (!line) | |
1813 | return log_oom(); | |
1814 | ||
f47781d8 MP |
1815 | log_unit_struct(params->unit_id, |
1816 | LOG_DEBUG, | |
5eef597e | 1817 | "EXECUTABLE=%s", command->path, |
f47781d8 | 1818 | LOG_MESSAGE("About to execute: %s", line), |
5eef597e MP |
1819 | NULL); |
1820 | free(line); | |
1821 | ||
1822 | pid = fork(); | |
1823 | if (pid < 0) | |
1824 | return -errno; | |
663996b3 | 1825 | |
5eef597e MP |
1826 | if (pid == 0) { |
1827 | int r; | |
1828 | ||
1829 | err = exec_child(command, | |
1830 | context, | |
1831 | params, | |
1832 | runtime, | |
1833 | argv, | |
1834 | socket_fd, | |
1835 | fds, n_fds, | |
1836 | files_env, | |
1837 | &r); | |
663996b3 MS |
1838 | if (r != 0) { |
1839 | log_open(); | |
f47781d8 MP |
1840 | log_struct(LOG_ERR, |
1841 | LOG_MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED), | |
663996b3 | 1842 | "EXECUTABLE=%s", command->path, |
f47781d8 MP |
1843 | LOG_MESSAGE("Failed at step %s spawning %s: %s", |
1844 | exit_status_to_string(r, EXIT_STATUS_SYSTEMD), | |
1845 | command->path, strerror(-err)), | |
1846 | LOG_ERRNO(-err), | |
663996b3 MS |
1847 | NULL); |
1848 | log_close(); | |
1849 | } | |
1850 | ||
1851 | _exit(r); | |
1852 | } | |
1853 | ||
f47781d8 MP |
1854 | log_unit_struct(params->unit_id, |
1855 | LOG_DEBUG, | |
1856 | LOG_MESSAGE("Forked %s as "PID_FMT, | |
1857 | command->path, pid), | |
663996b3 MS |
1858 | NULL); |
1859 | ||
1860 | /* We add the new process to the cgroup both in the child (so | |
1861 | * that we can be sure that no user code is ever executed | |
1862 | * outside of the cgroup) and in the parent (so that we can be | |
1863 | * sure that when we kill the cgroup the process will be | |
1864 | * killed too). */ | |
5eef597e MP |
1865 | if (params->cgroup_path) |
1866 | cg_attach(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, pid); | |
663996b3 MS |
1867 | |
1868 | exec_status_start(&command->exec_status, pid); | |
1869 | ||
1870 | *ret = pid; | |
1871 | return 0; | |
1872 | } | |
1873 | ||
1874 | void exec_context_init(ExecContext *c) { | |
1875 | assert(c); | |
1876 | ||
1877 | c->umask = 0022; | |
1878 | c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0); | |
1879 | c->cpu_sched_policy = SCHED_OTHER; | |
1880 | c->syslog_priority = LOG_DAEMON|LOG_INFO; | |
1881 | c->syslog_level_prefix = true; | |
663996b3 | 1882 | c->ignore_sigpipe = true; |
5eef597e | 1883 | c->timer_slack_nsec = NSEC_INFINITY; |
60f067b4 JS |
1884 | c->personality = 0xffffffffUL; |
1885 | c->runtime_directory_mode = 0755; | |
663996b3 MS |
1886 | } |
1887 | ||
60f067b4 | 1888 | void exec_context_done(ExecContext *c) { |
663996b3 MS |
1889 | unsigned l; |
1890 | ||
1891 | assert(c); | |
1892 | ||
1893 | strv_free(c->environment); | |
1894 | c->environment = NULL; | |
1895 | ||
1896 | strv_free(c->environment_files); | |
1897 | c->environment_files = NULL; | |
1898 | ||
1899 | for (l = 0; l < ELEMENTSOF(c->rlimit); l++) { | |
1900 | free(c->rlimit[l]); | |
1901 | c->rlimit[l] = NULL; | |
1902 | } | |
1903 | ||
1904 | free(c->working_directory); | |
1905 | c->working_directory = NULL; | |
1906 | free(c->root_directory); | |
1907 | c->root_directory = NULL; | |
1908 | ||
1909 | free(c->tty_path); | |
1910 | c->tty_path = NULL; | |
1911 | ||
663996b3 MS |
1912 | free(c->syslog_identifier); |
1913 | c->syslog_identifier = NULL; | |
1914 | ||
1915 | free(c->user); | |
1916 | c->user = NULL; | |
1917 | ||
1918 | free(c->group); | |
1919 | c->group = NULL; | |
1920 | ||
1921 | strv_free(c->supplementary_groups); | |
1922 | c->supplementary_groups = NULL; | |
1923 | ||
1924 | free(c->pam_name); | |
1925 | c->pam_name = NULL; | |
1926 | ||
1927 | if (c->capabilities) { | |
1928 | cap_free(c->capabilities); | |
1929 | c->capabilities = NULL; | |
1930 | } | |
1931 | ||
1932 | strv_free(c->read_only_dirs); | |
1933 | c->read_only_dirs = NULL; | |
1934 | ||
1935 | strv_free(c->read_write_dirs); | |
1936 | c->read_write_dirs = NULL; | |
1937 | ||
1938 | strv_free(c->inaccessible_dirs); | |
1939 | c->inaccessible_dirs = NULL; | |
1940 | ||
1941 | if (c->cpuset) | |
1942 | CPU_FREE(c->cpuset); | |
1943 | ||
1944 | free(c->utmp_id); | |
1945 | c->utmp_id = NULL; | |
1946 | ||
60f067b4 JS |
1947 | free(c->selinux_context); |
1948 | c->selinux_context = NULL; | |
1949 | ||
1950 | free(c->apparmor_profile); | |
1951 | c->apparmor_profile = NULL; | |
1952 | ||
1953 | set_free(c->syscall_filter); | |
663996b3 MS |
1954 | c->syscall_filter = NULL; |
1955 | ||
60f067b4 JS |
1956 | set_free(c->syscall_archs); |
1957 | c->syscall_archs = NULL; | |
1958 | ||
1959 | set_free(c->address_families); | |
1960 | c->address_families = NULL; | |
1961 | ||
1962 | strv_free(c->runtime_directory); | |
1963 | c->runtime_directory = NULL; | |
5eef597e MP |
1964 | |
1965 | bus_endpoint_free(c->bus_endpoint); | |
1966 | c->bus_endpoint = NULL; | |
60f067b4 JS |
1967 | } |
1968 | ||
1969 | int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) { | |
1970 | char **i; | |
1971 | ||
1972 | assert(c); | |
1973 | ||
1974 | if (!runtime_prefix) | |
1975 | return 0; | |
1976 | ||
1977 | STRV_FOREACH(i, c->runtime_directory) { | |
1978 | _cleanup_free_ char *p; | |
1979 | ||
1980 | p = strjoin(runtime_prefix, "/", *i, NULL); | |
1981 | if (!p) | |
1982 | return -ENOMEM; | |
1983 | ||
1984 | /* We execute this synchronously, since we need to be | |
1985 | * sure this is gone when we start the service | |
1986 | * next. */ | |
1987 | rm_rf_dangerous(p, false, true, false); | |
1988 | } | |
1989 | ||
1990 | return 0; | |
663996b3 MS |
1991 | } |
1992 | ||
1993 | void exec_command_done(ExecCommand *c) { | |
1994 | assert(c); | |
1995 | ||
1996 | free(c->path); | |
1997 | c->path = NULL; | |
1998 | ||
1999 | strv_free(c->argv); | |
2000 | c->argv = NULL; | |
2001 | } | |
2002 | ||
2003 | void exec_command_done_array(ExecCommand *c, unsigned n) { | |
2004 | unsigned i; | |
2005 | ||
2006 | for (i = 0; i < n; i++) | |
2007 | exec_command_done(c+i); | |
2008 | } | |
2009 | ||
2010 | void exec_command_free_list(ExecCommand *c) { | |
2011 | ExecCommand *i; | |
2012 | ||
2013 | while ((i = c)) { | |
60f067b4 | 2014 | LIST_REMOVE(command, c, i); |
663996b3 MS |
2015 | exec_command_done(i); |
2016 | free(i); | |
2017 | } | |
2018 | } | |
2019 | ||
2020 | void exec_command_free_array(ExecCommand **c, unsigned n) { | |
2021 | unsigned i; | |
2022 | ||
2023 | for (i = 0; i < n; i++) { | |
2024 | exec_command_free_list(c[i]); | |
2025 | c[i] = NULL; | |
2026 | } | |
2027 | } | |
2028 | ||
5eef597e | 2029 | int exec_context_load_environment(const ExecContext *c, const char *unit_id, char ***l) { |
663996b3 MS |
2030 | char **i, **r = NULL; |
2031 | ||
2032 | assert(c); | |
2033 | assert(l); | |
2034 | ||
2035 | STRV_FOREACH(i, c->environment_files) { | |
2036 | char *fn; | |
2037 | int k; | |
2038 | bool ignore = false; | |
2039 | char **p; | |
2040 | _cleanup_globfree_ glob_t pglob = {}; | |
2041 | int count, n; | |
2042 | ||
2043 | fn = *i; | |
2044 | ||
2045 | if (fn[0] == '-') { | |
2046 | ignore = true; | |
2047 | fn ++; | |
2048 | } | |
2049 | ||
2050 | if (!path_is_absolute(fn)) { | |
2051 | if (ignore) | |
2052 | continue; | |
2053 | ||
2054 | strv_free(r); | |
2055 | return -EINVAL; | |
2056 | } | |
2057 | ||
2058 | /* Filename supports globbing, take all matching files */ | |
2059 | errno = 0; | |
2060 | if (glob(fn, 0, NULL, &pglob) != 0) { | |
2061 | if (ignore) | |
2062 | continue; | |
2063 | ||
2064 | strv_free(r); | |
2065 | return errno ? -errno : -EINVAL; | |
2066 | } | |
2067 | count = pglob.gl_pathc; | |
2068 | if (count == 0) { | |
2069 | if (ignore) | |
2070 | continue; | |
2071 | ||
2072 | strv_free(r); | |
2073 | return -EINVAL; | |
2074 | } | |
2075 | for (n = 0; n < count; n++) { | |
e842803a | 2076 | k = load_env_file(NULL, pglob.gl_pathv[n], NULL, &p); |
663996b3 MS |
2077 | if (k < 0) { |
2078 | if (ignore) | |
2079 | continue; | |
2080 | ||
2081 | strv_free(r); | |
2082 | return k; | |
14228c0d | 2083 | } |
663996b3 | 2084 | /* Log invalid environment variables with filename */ |
14228c0d | 2085 | if (p) |
5eef597e | 2086 | p = strv_env_clean_log(p, unit_id, pglob.gl_pathv[n]); |
663996b3 MS |
2087 | |
2088 | if (r == NULL) | |
2089 | r = p; | |
2090 | else { | |
2091 | char **m; | |
2092 | ||
2093 | m = strv_env_merge(2, r, p); | |
2094 | strv_free(r); | |
2095 | strv_free(p); | |
2096 | if (!m) | |
2097 | return -ENOMEM; | |
2098 | ||
2099 | r = m; | |
2100 | } | |
2101 | } | |
2102 | } | |
2103 | ||
2104 | *l = r; | |
2105 | ||
2106 | return 0; | |
2107 | } | |
2108 | ||
2109 | static bool tty_may_match_dev_console(const char *tty) { | |
e842803a MB |
2110 | _cleanup_free_ char *active = NULL; |
2111 | char *console; | |
663996b3 MS |
2112 | |
2113 | if (startswith(tty, "/dev/")) | |
2114 | tty += 5; | |
2115 | ||
2116 | /* trivial identity? */ | |
2117 | if (streq(tty, "console")) | |
2118 | return true; | |
2119 | ||
2120 | console = resolve_dev_console(&active); | |
2121 | /* if we could not resolve, assume it may */ | |
2122 | if (!console) | |
2123 | return true; | |
2124 | ||
2125 | /* "tty0" means the active VC, so it may be the same sometimes */ | |
e842803a | 2126 | return streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty)); |
663996b3 MS |
2127 | } |
2128 | ||
2129 | bool exec_context_may_touch_console(ExecContext *ec) { | |
2130 | return (ec->tty_reset || ec->tty_vhangup || ec->tty_vt_disallocate || | |
2131 | is_terminal_input(ec->std_input) || | |
2132 | is_terminal_output(ec->std_output) || | |
2133 | is_terminal_output(ec->std_error)) && | |
2134 | tty_may_match_dev_console(tty_path(ec)); | |
2135 | } | |
2136 | ||
2137 | static void strv_fprintf(FILE *f, char **l) { | |
2138 | char **g; | |
2139 | ||
2140 | assert(f); | |
2141 | ||
2142 | STRV_FOREACH(g, l) | |
2143 | fprintf(f, " %s", *g); | |
2144 | } | |
2145 | ||
2146 | void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { | |
14228c0d | 2147 | char **e; |
663996b3 MS |
2148 | unsigned i; |
2149 | ||
2150 | assert(c); | |
2151 | assert(f); | |
2152 | ||
14228c0d | 2153 | prefix = strempty(prefix); |
663996b3 MS |
2154 | |
2155 | fprintf(f, | |
2156 | "%sUMask: %04o\n" | |
2157 | "%sWorkingDirectory: %s\n" | |
2158 | "%sRootDirectory: %s\n" | |
2159 | "%sNonBlocking: %s\n" | |
2160 | "%sPrivateTmp: %s\n" | |
663996b3 | 2161 | "%sPrivateNetwork: %s\n" |
60f067b4 JS |
2162 | "%sPrivateDevices: %s\n" |
2163 | "%sProtectHome: %s\n" | |
2164 | "%sProtectSystem: %s\n" | |
663996b3 MS |
2165 | "%sIgnoreSIGPIPE: %s\n", |
2166 | prefix, c->umask, | |
2167 | prefix, c->working_directory ? c->working_directory : "/", | |
2168 | prefix, c->root_directory ? c->root_directory : "/", | |
2169 | prefix, yes_no(c->non_blocking), | |
2170 | prefix, yes_no(c->private_tmp), | |
663996b3 | 2171 | prefix, yes_no(c->private_network), |
60f067b4 JS |
2172 | prefix, yes_no(c->private_devices), |
2173 | prefix, protect_home_to_string(c->protect_home), | |
2174 | prefix, protect_system_to_string(c->protect_system), | |
663996b3 MS |
2175 | prefix, yes_no(c->ignore_sigpipe)); |
2176 | ||
2177 | STRV_FOREACH(e, c->environment) | |
2178 | fprintf(f, "%sEnvironment: %s\n", prefix, *e); | |
2179 | ||
2180 | STRV_FOREACH(e, c->environment_files) | |
2181 | fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e); | |
2182 | ||
663996b3 MS |
2183 | if (c->nice_set) |
2184 | fprintf(f, | |
2185 | "%sNice: %i\n", | |
2186 | prefix, c->nice); | |
2187 | ||
2188 | if (c->oom_score_adjust_set) | |
2189 | fprintf(f, | |
2190 | "%sOOMScoreAdjust: %i\n", | |
2191 | prefix, c->oom_score_adjust); | |
2192 | ||
2193 | for (i = 0; i < RLIM_NLIMITS; i++) | |
2194 | if (c->rlimit[i]) | |
60f067b4 JS |
2195 | fprintf(f, "%s%s: "RLIM_FMT"\n", |
2196 | prefix, rlimit_to_string(i), c->rlimit[i]->rlim_max); | |
663996b3 MS |
2197 | |
2198 | if (c->ioprio_set) { | |
60f067b4 | 2199 | _cleanup_free_ char *class_str = NULL; |
663996b3 | 2200 | |
60f067b4 | 2201 | ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str); |
663996b3 MS |
2202 | fprintf(f, |
2203 | "%sIOSchedulingClass: %s\n" | |
2204 | "%sIOPriority: %i\n", | |
2205 | prefix, strna(class_str), | |
2206 | prefix, (int) IOPRIO_PRIO_DATA(c->ioprio)); | |
663996b3 MS |
2207 | } |
2208 | ||
2209 | if (c->cpu_sched_set) { | |
60f067b4 | 2210 | _cleanup_free_ char *policy_str = NULL; |
663996b3 | 2211 | |
60f067b4 | 2212 | sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str); |
663996b3 MS |
2213 | fprintf(f, |
2214 | "%sCPUSchedulingPolicy: %s\n" | |
2215 | "%sCPUSchedulingPriority: %i\n" | |
2216 | "%sCPUSchedulingResetOnFork: %s\n", | |
2217 | prefix, strna(policy_str), | |
2218 | prefix, c->cpu_sched_priority, | |
2219 | prefix, yes_no(c->cpu_sched_reset_on_fork)); | |
663996b3 MS |
2220 | } |
2221 | ||
2222 | if (c->cpuset) { | |
2223 | fprintf(f, "%sCPUAffinity:", prefix); | |
2224 | for (i = 0; i < c->cpuset_ncpus; i++) | |
2225 | if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset)) | |
60f067b4 | 2226 | fprintf(f, " %u", i); |
663996b3 MS |
2227 | fputs("\n", f); |
2228 | } | |
2229 | ||
5eef597e | 2230 | if (c->timer_slack_nsec != NSEC_INFINITY) |
60f067b4 | 2231 | fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec); |
663996b3 MS |
2232 | |
2233 | fprintf(f, | |
2234 | "%sStandardInput: %s\n" | |
2235 | "%sStandardOutput: %s\n" | |
2236 | "%sStandardError: %s\n", | |
2237 | prefix, exec_input_to_string(c->std_input), | |
2238 | prefix, exec_output_to_string(c->std_output), | |
2239 | prefix, exec_output_to_string(c->std_error)); | |
2240 | ||
2241 | if (c->tty_path) | |
2242 | fprintf(f, | |
2243 | "%sTTYPath: %s\n" | |
2244 | "%sTTYReset: %s\n" | |
2245 | "%sTTYVHangup: %s\n" | |
2246 | "%sTTYVTDisallocate: %s\n", | |
2247 | prefix, c->tty_path, | |
2248 | prefix, yes_no(c->tty_reset), | |
2249 | prefix, yes_no(c->tty_vhangup), | |
2250 | prefix, yes_no(c->tty_vt_disallocate)); | |
2251 | ||
60f067b4 JS |
2252 | if (c->std_output == EXEC_OUTPUT_SYSLOG || |
2253 | c->std_output == EXEC_OUTPUT_KMSG || | |
2254 | c->std_output == EXEC_OUTPUT_JOURNAL || | |
2255 | c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
2256 | c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
2257 | c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE || | |
2258 | c->std_error == EXEC_OUTPUT_SYSLOG || | |
2259 | c->std_error == EXEC_OUTPUT_KMSG || | |
2260 | c->std_error == EXEC_OUTPUT_JOURNAL || | |
2261 | c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
2262 | c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
2263 | c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) { | |
663996b3 | 2264 | |
60f067b4 | 2265 | _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL; |
663996b3 | 2266 | |
60f067b4 JS |
2267 | log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str); |
2268 | log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str); | |
663996b3 MS |
2269 | |
2270 | fprintf(f, | |
2271 | "%sSyslogFacility: %s\n" | |
2272 | "%sSyslogLevel: %s\n", | |
2273 | prefix, strna(fac_str), | |
2274 | prefix, strna(lvl_str)); | |
663996b3 MS |
2275 | } |
2276 | ||
2277 | if (c->capabilities) { | |
60f067b4 JS |
2278 | _cleanup_cap_free_charp_ char *t; |
2279 | ||
2280 | t = cap_to_text(c->capabilities, NULL); | |
2281 | if (t) | |
2282 | fprintf(f, "%sCapabilities: %s\n", prefix, t); | |
663996b3 MS |
2283 | } |
2284 | ||
2285 | if (c->secure_bits) | |
2286 | fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n", | |
2287 | prefix, | |
2288 | (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "", | |
2289 | (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "", | |
2290 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "", | |
2291 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "", | |
2292 | (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "", | |
2293 | (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : ""); | |
2294 | ||
2295 | if (c->capability_bounding_set_drop) { | |
2296 | unsigned long l; | |
2297 | fprintf(f, "%sCapabilityBoundingSet:", prefix); | |
2298 | ||
2299 | for (l = 0; l <= cap_last_cap(); l++) | |
f47781d8 MP |
2300 | if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) |
2301 | fprintf(f, " %s", strna(capability_to_name(l))); | |
663996b3 MS |
2302 | |
2303 | fputs("\n", f); | |
2304 | } | |
2305 | ||
2306 | if (c->user) | |
2307 | fprintf(f, "%sUser: %s\n", prefix, c->user); | |
2308 | if (c->group) | |
2309 | fprintf(f, "%sGroup: %s\n", prefix, c->group); | |
2310 | ||
2311 | if (strv_length(c->supplementary_groups) > 0) { | |
2312 | fprintf(f, "%sSupplementaryGroups:", prefix); | |
2313 | strv_fprintf(f, c->supplementary_groups); | |
2314 | fputs("\n", f); | |
2315 | } | |
2316 | ||
2317 | if (c->pam_name) | |
2318 | fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name); | |
2319 | ||
2320 | if (strv_length(c->read_write_dirs) > 0) { | |
2321 | fprintf(f, "%sReadWriteDirs:", prefix); | |
2322 | strv_fprintf(f, c->read_write_dirs); | |
2323 | fputs("\n", f); | |
2324 | } | |
2325 | ||
2326 | if (strv_length(c->read_only_dirs) > 0) { | |
2327 | fprintf(f, "%sReadOnlyDirs:", prefix); | |
2328 | strv_fprintf(f, c->read_only_dirs); | |
2329 | fputs("\n", f); | |
2330 | } | |
2331 | ||
2332 | if (strv_length(c->inaccessible_dirs) > 0) { | |
2333 | fprintf(f, "%sInaccessibleDirs:", prefix); | |
2334 | strv_fprintf(f, c->inaccessible_dirs); | |
2335 | fputs("\n", f); | |
2336 | } | |
2337 | ||
2338 | if (c->utmp_id) | |
2339 | fprintf(f, | |
2340 | "%sUtmpIdentifier: %s\n", | |
2341 | prefix, c->utmp_id); | |
60f067b4 JS |
2342 | |
2343 | if (c->selinux_context) | |
2344 | fprintf(f, | |
2345 | "%sSELinuxContext: %s%s\n", | |
2346 | prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context); | |
2347 | ||
2348 | if (c->personality != 0xffffffffUL) | |
2349 | fprintf(f, | |
2350 | "%sPersonality: %s\n", | |
2351 | prefix, strna(personality_to_string(c->personality))); | |
2352 | ||
2353 | if (c->syscall_filter) { | |
2354 | #ifdef HAVE_SECCOMP | |
2355 | Iterator j; | |
2356 | void *id; | |
2357 | bool first = true; | |
2358 | #endif | |
2359 | ||
2360 | fprintf(f, | |
2361 | "%sSystemCallFilter: ", | |
2362 | prefix); | |
2363 | ||
2364 | if (!c->syscall_whitelist) | |
2365 | fputc('~', f); | |
2366 | ||
2367 | #ifdef HAVE_SECCOMP | |
2368 | SET_FOREACH(id, c->syscall_filter, j) { | |
2369 | _cleanup_free_ char *name = NULL; | |
2370 | ||
2371 | if (first) | |
2372 | first = false; | |
2373 | else | |
2374 | fputc(' ', f); | |
2375 | ||
2376 | name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1); | |
2377 | fputs(strna(name), f); | |
2378 | } | |
2379 | #endif | |
2380 | ||
2381 | fputc('\n', f); | |
2382 | } | |
2383 | ||
2384 | if (c->syscall_archs) { | |
2385 | #ifdef HAVE_SECCOMP | |
2386 | Iterator j; | |
2387 | void *id; | |
2388 | #endif | |
2389 | ||
2390 | fprintf(f, | |
2391 | "%sSystemCallArchitectures:", | |
2392 | prefix); | |
2393 | ||
2394 | #ifdef HAVE_SECCOMP | |
2395 | SET_FOREACH(id, c->syscall_archs, j) | |
2396 | fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1))); | |
2397 | #endif | |
2398 | fputc('\n', f); | |
2399 | } | |
2400 | ||
2401 | if (c->syscall_errno != 0) | |
2402 | fprintf(f, | |
2403 | "%sSystemCallErrorNumber: %s\n", | |
2404 | prefix, strna(errno_to_name(c->syscall_errno))); | |
2405 | ||
2406 | if (c->apparmor_profile) | |
2407 | fprintf(f, | |
2408 | "%sAppArmorProfile: %s%s\n", | |
2409 | prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile); | |
663996b3 MS |
2410 | } |
2411 | ||
f47781d8 MP |
2412 | bool exec_context_maintains_privileges(ExecContext *c) { |
2413 | assert(c); | |
2414 | ||
2415 | /* Returns true if the process forked off would run run under | |
2416 | * an unchanged UID or as root. */ | |
2417 | ||
2418 | if (!c->user) | |
2419 | return true; | |
2420 | ||
2421 | if (streq(c->user, "root") || streq(c->user, "0")) | |
2422 | return true; | |
2423 | ||
2424 | return false; | |
2425 | } | |
2426 | ||
663996b3 MS |
2427 | void exec_status_start(ExecStatus *s, pid_t pid) { |
2428 | assert(s); | |
2429 | ||
2430 | zero(*s); | |
2431 | s->pid = pid; | |
2432 | dual_timestamp_get(&s->start_timestamp); | |
2433 | } | |
2434 | ||
2435 | void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) { | |
2436 | assert(s); | |
2437 | ||
2438 | if (s->pid && s->pid != pid) | |
2439 | zero(*s); | |
2440 | ||
2441 | s->pid = pid; | |
2442 | dual_timestamp_get(&s->exit_timestamp); | |
2443 | ||
2444 | s->code = code; | |
2445 | s->status = status; | |
2446 | ||
2447 | if (context) { | |
2448 | if (context->utmp_id) | |
2449 | utmp_put_dead_process(context->utmp_id, pid, code, status); | |
2450 | ||
2451 | exec_context_tty_reset(context); | |
2452 | } | |
2453 | } | |
2454 | ||
2455 | void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) { | |
2456 | char buf[FORMAT_TIMESTAMP_MAX]; | |
2457 | ||
2458 | assert(s); | |
2459 | assert(f); | |
2460 | ||
663996b3 MS |
2461 | if (s->pid <= 0) |
2462 | return; | |
2463 | ||
5eef597e MP |
2464 | prefix = strempty(prefix); |
2465 | ||
663996b3 | 2466 | fprintf(f, |
60f067b4 JS |
2467 | "%sPID: "PID_FMT"\n", |
2468 | prefix, s->pid); | |
663996b3 MS |
2469 | |
2470 | if (s->start_timestamp.realtime > 0) | |
2471 | fprintf(f, | |
2472 | "%sStart Timestamp: %s\n", | |
2473 | prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime)); | |
2474 | ||
2475 | if (s->exit_timestamp.realtime > 0) | |
2476 | fprintf(f, | |
2477 | "%sExit Timestamp: %s\n" | |
2478 | "%sExit Code: %s\n" | |
2479 | "%sExit Status: %i\n", | |
2480 | prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime), | |
2481 | prefix, sigchld_code_to_string(s->code), | |
2482 | prefix, s->status); | |
2483 | } | |
2484 | ||
2485 | char *exec_command_line(char **argv) { | |
2486 | size_t k; | |
2487 | char *n, *p, **a; | |
2488 | bool first = true; | |
2489 | ||
2490 | assert(argv); | |
2491 | ||
2492 | k = 1; | |
2493 | STRV_FOREACH(a, argv) | |
2494 | k += strlen(*a)+3; | |
2495 | ||
2496 | if (!(n = new(char, k))) | |
2497 | return NULL; | |
2498 | ||
2499 | p = n; | |
2500 | STRV_FOREACH(a, argv) { | |
2501 | ||
2502 | if (!first) | |
2503 | *(p++) = ' '; | |
2504 | else | |
2505 | first = false; | |
2506 | ||
2507 | if (strpbrk(*a, WHITESPACE)) { | |
2508 | *(p++) = '\''; | |
2509 | p = stpcpy(p, *a); | |
2510 | *(p++) = '\''; | |
2511 | } else | |
2512 | p = stpcpy(p, *a); | |
2513 | ||
2514 | } | |
2515 | ||
2516 | *p = 0; | |
2517 | ||
2518 | /* FIXME: this doesn't really handle arguments that have | |
2519 | * spaces and ticks in them */ | |
2520 | ||
2521 | return n; | |
2522 | } | |
2523 | ||
2524 | void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) { | |
e842803a | 2525 | _cleanup_free_ char *cmd = NULL; |
5eef597e | 2526 | const char *prefix2; |
663996b3 MS |
2527 | |
2528 | assert(c); | |
2529 | assert(f); | |
2530 | ||
5eef597e MP |
2531 | prefix = strempty(prefix); |
2532 | prefix2 = strappenda(prefix, "\t"); | |
663996b3 MS |
2533 | |
2534 | cmd = exec_command_line(c->argv); | |
663996b3 MS |
2535 | fprintf(f, |
2536 | "%sCommand Line: %s\n", | |
2537 | prefix, cmd ? cmd : strerror(ENOMEM)); | |
2538 | ||
663996b3 | 2539 | exec_status_dump(&c->exec_status, f, prefix2); |
663996b3 MS |
2540 | } |
2541 | ||
2542 | void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) { | |
2543 | assert(f); | |
2544 | ||
5eef597e | 2545 | prefix = strempty(prefix); |
663996b3 MS |
2546 | |
2547 | LIST_FOREACH(command, c, c) | |
2548 | exec_command_dump(c, f, prefix); | |
2549 | } | |
2550 | ||
2551 | void exec_command_append_list(ExecCommand **l, ExecCommand *e) { | |
2552 | ExecCommand *end; | |
2553 | ||
2554 | assert(l); | |
2555 | assert(e); | |
2556 | ||
2557 | if (*l) { | |
2558 | /* It's kind of important, that we keep the order here */ | |
60f067b4 JS |
2559 | LIST_FIND_TAIL(command, *l, end); |
2560 | LIST_INSERT_AFTER(command, *l, end, e); | |
663996b3 MS |
2561 | } else |
2562 | *l = e; | |
2563 | } | |
2564 | ||
2565 | int exec_command_set(ExecCommand *c, const char *path, ...) { | |
2566 | va_list ap; | |
2567 | char **l, *p; | |
2568 | ||
2569 | assert(c); | |
2570 | assert(path); | |
2571 | ||
2572 | va_start(ap, path); | |
2573 | l = strv_new_ap(path, ap); | |
2574 | va_end(ap); | |
2575 | ||
2576 | if (!l) | |
2577 | return -ENOMEM; | |
2578 | ||
60f067b4 JS |
2579 | p = strdup(path); |
2580 | if (!p) { | |
663996b3 MS |
2581 | strv_free(l); |
2582 | return -ENOMEM; | |
2583 | } | |
2584 | ||
2585 | free(c->path); | |
2586 | c->path = p; | |
2587 | ||
2588 | strv_free(c->argv); | |
2589 | c->argv = l; | |
2590 | ||
2591 | return 0; | |
2592 | } | |
2593 | ||
5eef597e MP |
2594 | int exec_command_append(ExecCommand *c, const char *path, ...) { |
2595 | _cleanup_strv_free_ char **l = NULL; | |
2596 | va_list ap; | |
2597 | int r; | |
2598 | ||
2599 | assert(c); | |
2600 | assert(path); | |
2601 | ||
2602 | va_start(ap, path); | |
2603 | l = strv_new_ap(path, ap); | |
2604 | va_end(ap); | |
2605 | ||
2606 | if (!l) | |
2607 | return -ENOMEM; | |
2608 | ||
2609 | r = strv_extend_strv(&c->argv, l); | |
2610 | if (r < 0) | |
2611 | return r; | |
2612 | ||
2613 | return 0; | |
2614 | } | |
2615 | ||
2616 | ||
60f067b4 JS |
2617 | static int exec_runtime_allocate(ExecRuntime **rt) { |
2618 | ||
2619 | if (*rt) | |
2620 | return 0; | |
2621 | ||
2622 | *rt = new0(ExecRuntime, 1); | |
2623 | if (!*rt) | |
2624 | return -ENOMEM; | |
2625 | ||
2626 | (*rt)->n_ref = 1; | |
2627 | (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1; | |
2628 | ||
2629 | return 0; | |
2630 | } | |
2631 | ||
2632 | int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) { | |
2633 | int r; | |
2634 | ||
2635 | assert(rt); | |
2636 | assert(c); | |
2637 | assert(id); | |
2638 | ||
2639 | if (*rt) | |
2640 | return 1; | |
2641 | ||
2642 | if (!c->private_network && !c->private_tmp) | |
2643 | return 0; | |
2644 | ||
2645 | r = exec_runtime_allocate(rt); | |
2646 | if (r < 0) | |
2647 | return r; | |
2648 | ||
2649 | if (c->private_network && (*rt)->netns_storage_socket[0] < 0) { | |
2650 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, (*rt)->netns_storage_socket) < 0) | |
2651 | return -errno; | |
2652 | } | |
2653 | ||
2654 | if (c->private_tmp && !(*rt)->tmp_dir) { | |
2655 | r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir); | |
2656 | if (r < 0) | |
2657 | return r; | |
2658 | } | |
2659 | ||
2660 | return 1; | |
2661 | } | |
2662 | ||
2663 | ExecRuntime *exec_runtime_ref(ExecRuntime *r) { | |
2664 | assert(r); | |
2665 | assert(r->n_ref > 0); | |
2666 | ||
2667 | r->n_ref++; | |
2668 | return r; | |
2669 | } | |
2670 | ||
2671 | ExecRuntime *exec_runtime_unref(ExecRuntime *r) { | |
2672 | ||
2673 | if (!r) | |
2674 | return NULL; | |
2675 | ||
2676 | assert(r->n_ref > 0); | |
2677 | ||
2678 | r->n_ref--; | |
2679 | if (r->n_ref <= 0) { | |
2680 | free(r->tmp_dir); | |
2681 | free(r->var_tmp_dir); | |
2682 | safe_close_pair(r->netns_storage_socket); | |
2683 | free(r); | |
2684 | } | |
2685 | ||
2686 | return NULL; | |
2687 | } | |
2688 | ||
2689 | int exec_runtime_serialize(ExecRuntime *rt, Unit *u, FILE *f, FDSet *fds) { | |
2690 | assert(u); | |
2691 | assert(f); | |
2692 | assert(fds); | |
2693 | ||
2694 | if (!rt) | |
2695 | return 0; | |
2696 | ||
2697 | if (rt->tmp_dir) | |
2698 | unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir); | |
2699 | ||
2700 | if (rt->var_tmp_dir) | |
2701 | unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir); | |
2702 | ||
2703 | if (rt->netns_storage_socket[0] >= 0) { | |
2704 | int copy; | |
2705 | ||
2706 | copy = fdset_put_dup(fds, rt->netns_storage_socket[0]); | |
2707 | if (copy < 0) | |
2708 | return copy; | |
2709 | ||
2710 | unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy); | |
2711 | } | |
2712 | ||
2713 | if (rt->netns_storage_socket[1] >= 0) { | |
2714 | int copy; | |
2715 | ||
2716 | copy = fdset_put_dup(fds, rt->netns_storage_socket[1]); | |
2717 | if (copy < 0) | |
2718 | return copy; | |
2719 | ||
2720 | unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy); | |
2721 | } | |
2722 | ||
2723 | return 0; | |
2724 | } | |
2725 | ||
2726 | int exec_runtime_deserialize_item(ExecRuntime **rt, Unit *u, const char *key, const char *value, FDSet *fds) { | |
2727 | int r; | |
2728 | ||
2729 | assert(rt); | |
2730 | assert(key); | |
2731 | assert(value); | |
2732 | ||
2733 | if (streq(key, "tmp-dir")) { | |
2734 | char *copy; | |
2735 | ||
2736 | r = exec_runtime_allocate(rt); | |
2737 | if (r < 0) | |
2738 | return r; | |
2739 | ||
2740 | copy = strdup(value); | |
2741 | if (!copy) | |
2742 | return log_oom(); | |
2743 | ||
2744 | free((*rt)->tmp_dir); | |
2745 | (*rt)->tmp_dir = copy; | |
2746 | ||
2747 | } else if (streq(key, "var-tmp-dir")) { | |
2748 | char *copy; | |
2749 | ||
2750 | r = exec_runtime_allocate(rt); | |
2751 | if (r < 0) | |
2752 | return r; | |
2753 | ||
2754 | copy = strdup(value); | |
2755 | if (!copy) | |
2756 | return log_oom(); | |
2757 | ||
2758 | free((*rt)->var_tmp_dir); | |
2759 | (*rt)->var_tmp_dir = copy; | |
2760 | ||
2761 | } else if (streq(key, "netns-socket-0")) { | |
2762 | int fd; | |
2763 | ||
2764 | r = exec_runtime_allocate(rt); | |
2765 | if (r < 0) | |
2766 | return r; | |
2767 | ||
2768 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
f47781d8 | 2769 | log_unit_debug(u->id, "Failed to parse netns socket value %s", value); |
60f067b4 JS |
2770 | else { |
2771 | safe_close((*rt)->netns_storage_socket[0]); | |
2772 | (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd); | |
2773 | } | |
2774 | } else if (streq(key, "netns-socket-1")) { | |
2775 | int fd; | |
2776 | ||
2777 | r = exec_runtime_allocate(rt); | |
2778 | if (r < 0) | |
2779 | return r; | |
2780 | ||
2781 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
f47781d8 | 2782 | log_unit_debug(u->id, "Failed to parse netns socket value %s", value); |
60f067b4 JS |
2783 | else { |
2784 | safe_close((*rt)->netns_storage_socket[1]); | |
2785 | (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd); | |
2786 | } | |
2787 | } else | |
2788 | return 0; | |
2789 | ||
2790 | return 1; | |
2791 | } | |
2792 | ||
2793 | static void *remove_tmpdir_thread(void *p) { | |
2794 | _cleanup_free_ char *path = p; | |
2795 | ||
2796 | rm_rf_dangerous(path, false, true, false); | |
2797 | return NULL; | |
2798 | } | |
2799 | ||
2800 | void exec_runtime_destroy(ExecRuntime *rt) { | |
2801 | int r; | |
2802 | ||
2803 | if (!rt) | |
2804 | return; | |
2805 | ||
2806 | /* If there are multiple users of this, let's leave the stuff around */ | |
2807 | if (rt->n_ref > 1) | |
2808 | return; | |
2809 | ||
2810 | if (rt->tmp_dir) { | |
2811 | log_debug("Spawning thread to nuke %s", rt->tmp_dir); | |
2812 | ||
2813 | r = asynchronous_job(remove_tmpdir_thread, rt->tmp_dir); | |
2814 | if (r < 0) { | |
f47781d8 | 2815 | log_warning_errno(r, "Failed to nuke %s: %m", rt->tmp_dir); |
60f067b4 JS |
2816 | free(rt->tmp_dir); |
2817 | } | |
2818 | ||
2819 | rt->tmp_dir = NULL; | |
2820 | } | |
2821 | ||
2822 | if (rt->var_tmp_dir) { | |
2823 | log_debug("Spawning thread to nuke %s", rt->var_tmp_dir); | |
2824 | ||
2825 | r = asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir); | |
2826 | if (r < 0) { | |
f47781d8 | 2827 | log_warning_errno(r, "Failed to nuke %s: %m", rt->var_tmp_dir); |
60f067b4 JS |
2828 | free(rt->var_tmp_dir); |
2829 | } | |
2830 | ||
2831 | rt->var_tmp_dir = NULL; | |
2832 | } | |
2833 | ||
2834 | safe_close_pair(rt->netns_storage_socket); | |
2835 | } | |
2836 | ||
663996b3 MS |
2837 | static const char* const exec_input_table[_EXEC_INPUT_MAX] = { |
2838 | [EXEC_INPUT_NULL] = "null", | |
2839 | [EXEC_INPUT_TTY] = "tty", | |
2840 | [EXEC_INPUT_TTY_FORCE] = "tty-force", | |
2841 | [EXEC_INPUT_TTY_FAIL] = "tty-fail", | |
2842 | [EXEC_INPUT_SOCKET] = "socket" | |
2843 | }; | |
2844 | ||
2845 | DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput); | |
2846 | ||
2847 | static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = { | |
2848 | [EXEC_OUTPUT_INHERIT] = "inherit", | |
2849 | [EXEC_OUTPUT_NULL] = "null", | |
2850 | [EXEC_OUTPUT_TTY] = "tty", | |
2851 | [EXEC_OUTPUT_SYSLOG] = "syslog", | |
2852 | [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console", | |
2853 | [EXEC_OUTPUT_KMSG] = "kmsg", | |
2854 | [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console", | |
2855 | [EXEC_OUTPUT_JOURNAL] = "journal", | |
2856 | [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console", | |
2857 | [EXEC_OUTPUT_SOCKET] = "socket" | |
2858 | }; | |
2859 | ||
2860 | DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput); |