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1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ | |
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 General Public License as published by | |
10 | the Free Software Foundation; either version 2 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 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU 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 | ||
40 | #include "execute.h" | |
41 | #include "strv.h" | |
42 | #include "macro.h" | |
43 | #include "util.h" | |
44 | #include "log.h" | |
45 | #include "ioprio.h" | |
46 | #include "securebits.h" | |
47 | #include "cgroup.h" | |
48 | #include "namespace.h" | |
49 | ||
50 | /* This assumes there is a 'tty' group */ | |
51 | #define TTY_MODE 0620 | |
52 | ||
53 | static int shift_fds(int fds[], unsigned n_fds) { | |
54 | int start, restart_from; | |
55 | ||
56 | if (n_fds <= 0) | |
57 | return 0; | |
58 | ||
59 | /* Modifies the fds array! (sorts it) */ | |
60 | ||
61 | assert(fds); | |
62 | ||
63 | start = 0; | |
64 | for (;;) { | |
65 | int i; | |
66 | ||
67 | restart_from = -1; | |
68 | ||
69 | for (i = start; i < (int) n_fds; i++) { | |
70 | int nfd; | |
71 | ||
72 | /* Already at right index? */ | |
73 | if (fds[i] == i+3) | |
74 | continue; | |
75 | ||
76 | if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0) | |
77 | return -errno; | |
78 | ||
79 | close_nointr_nofail(fds[i]); | |
80 | fds[i] = nfd; | |
81 | ||
82 | /* Hmm, the fd we wanted isn't free? Then | |
83 | * let's remember that and try again from here*/ | |
84 | if (nfd != i+3 && restart_from < 0) | |
85 | restart_from = i; | |
86 | } | |
87 | ||
88 | if (restart_from < 0) | |
89 | break; | |
90 | ||
91 | start = restart_from; | |
92 | } | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) { | |
98 | unsigned i; | |
99 | int r; | |
100 | ||
101 | if (n_fds <= 0) | |
102 | return 0; | |
103 | ||
104 | assert(fds); | |
105 | ||
106 | /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */ | |
107 | ||
108 | for (i = 0; i < n_fds; i++) { | |
109 | ||
110 | if ((r = fd_nonblock(fds[i], nonblock)) < 0) | |
111 | return r; | |
112 | ||
113 | /* We unconditionally drop FD_CLOEXEC from the fds, | |
114 | * since after all we want to pass these fds to our | |
115 | * children */ | |
116 | ||
117 | if ((r = fd_cloexec(fds[i], false)) < 0) | |
118 | return r; | |
119 | } | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | static const char *tty_path(const ExecContext *context) { | |
125 | assert(context); | |
126 | ||
127 | if (context->tty_path) | |
128 | return context->tty_path; | |
129 | ||
130 | return "/dev/console"; | |
131 | } | |
132 | ||
133 | static int open_null_as(int flags, int nfd) { | |
134 | int fd, r; | |
135 | ||
136 | assert(nfd >= 0); | |
137 | ||
138 | if ((fd = open("/dev/null", flags|O_NOCTTY)) < 0) | |
139 | return -errno; | |
140 | ||
141 | if (fd != nfd) { | |
142 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
143 | close_nointr_nofail(fd); | |
144 | } else | |
145 | r = nfd; | |
146 | ||
147 | return r; | |
148 | } | |
149 | ||
150 | static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, int nfd) { | |
151 | int fd, r; | |
152 | union { | |
153 | struct sockaddr sa; | |
154 | struct sockaddr_un un; | |
155 | } sa; | |
156 | ||
157 | assert(context); | |
158 | assert(output < _EXEC_OUTPUT_MAX); | |
159 | assert(ident); | |
160 | assert(nfd >= 0); | |
161 | ||
162 | if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) | |
163 | return -errno; | |
164 | ||
165 | zero(sa); | |
166 | sa.sa.sa_family = AF_UNIX; | |
167 | strncpy(sa.un.sun_path+1, LOGGER_SOCKET, sizeof(sa.un.sun_path)-1); | |
168 | ||
169 | if (connect(fd, &sa.sa, sizeof(sa)) < 0) { | |
170 | close_nointr_nofail(fd); | |
171 | return -errno; | |
172 | } | |
173 | ||
174 | if (shutdown(fd, SHUT_RD) < 0) { | |
175 | close_nointr_nofail(fd); | |
176 | return -errno; | |
177 | } | |
178 | ||
179 | /* We speak a very simple protocol between log server | |
180 | * and client: one line for the log destination (kmsg | |
181 | * or syslog), followed by the priority field, | |
182 | * followed by the process name. Since we replaced | |
183 | * stdin/stderr we simple use stdio to write to | |
184 | * it. Note that we use stderr, to minimize buffer | |
185 | * flushing issues. */ | |
186 | ||
187 | dprintf(fd, | |
188 | "%s\n" | |
189 | "%i\n" | |
190 | "%s\n", | |
191 | output == EXEC_OUTPUT_KERNEL ? "kmsg" : "syslog", | |
192 | context->syslog_priority, | |
193 | context->syslog_identifier ? context->syslog_identifier : ident); | |
194 | ||
195 | if (fd != nfd) { | |
196 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
197 | close_nointr_nofail(fd); | |
198 | } else | |
199 | r = nfd; | |
200 | ||
201 | return r; | |
202 | } | |
203 | static int open_terminal_as(const char *path, mode_t mode, int nfd) { | |
204 | int fd, r; | |
205 | ||
206 | assert(path); | |
207 | assert(nfd >= 0); | |
208 | ||
209 | if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0) | |
210 | return fd; | |
211 | ||
212 | if (fd != nfd) { | |
213 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
214 | close_nointr_nofail(fd); | |
215 | } else | |
216 | r = nfd; | |
217 | ||
218 | return r; | |
219 | } | |
220 | ||
221 | static bool is_terminal_input(ExecInput i) { | |
222 | return | |
223 | i == EXEC_INPUT_TTY || | |
224 | i == EXEC_INPUT_TTY_FORCE || | |
225 | i == EXEC_INPUT_TTY_FAIL; | |
226 | } | |
227 | ||
228 | static int fixup_input(const ExecContext *context, int socket_fd) { | |
229 | assert(context); | |
230 | ||
231 | if (socket_fd < 0 && context->std_input == EXEC_INPUT_SOCKET) | |
232 | return EXEC_INPUT_NULL; | |
233 | ||
234 | return context->std_input; | |
235 | } | |
236 | ||
237 | static int fixup_output(const ExecContext *context, int socket_fd) { | |
238 | assert(context); | |
239 | ||
240 | if (socket_fd < 0 && context->std_output == EXEC_OUTPUT_SOCKET) | |
241 | return EXEC_OUTPUT_INHERIT; | |
242 | ||
243 | return context->std_output; | |
244 | } | |
245 | ||
246 | static int fixup_error(const ExecContext *context, int socket_fd) { | |
247 | assert(context); | |
248 | ||
249 | if (socket_fd < 0 && context->std_error == EXEC_OUTPUT_SOCKET) | |
250 | return EXEC_OUTPUT_INHERIT; | |
251 | ||
252 | return context->std_error; | |
253 | } | |
254 | ||
255 | static int setup_input(const ExecContext *context, int socket_fd) { | |
256 | ExecInput i; | |
257 | ||
258 | assert(context); | |
259 | ||
260 | i = fixup_input(context, socket_fd); | |
261 | ||
262 | switch (i) { | |
263 | ||
264 | case EXEC_INPUT_NULL: | |
265 | return open_null_as(O_RDONLY, STDIN_FILENO); | |
266 | ||
267 | case EXEC_INPUT_TTY: | |
268 | case EXEC_INPUT_TTY_FORCE: | |
269 | case EXEC_INPUT_TTY_FAIL: { | |
270 | int fd, r; | |
271 | ||
272 | if ((fd = acquire_terminal( | |
273 | tty_path(context), | |
274 | i == EXEC_INPUT_TTY_FAIL, | |
275 | i == EXEC_INPUT_TTY_FORCE)) < 0) | |
276 | return fd; | |
277 | ||
278 | if (fd != STDIN_FILENO) { | |
279 | r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
280 | close_nointr_nofail(fd); | |
281 | } else | |
282 | r = STDIN_FILENO; | |
283 | ||
284 | return r; | |
285 | } | |
286 | ||
287 | case EXEC_INPUT_SOCKET: | |
288 | return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
289 | ||
290 | default: | |
291 | assert_not_reached("Unknown input type"); | |
292 | } | |
293 | } | |
294 | ||
295 | static int setup_output(const ExecContext *context, int socket_fd, const char *ident) { | |
296 | ExecOutput o; | |
297 | ExecInput i; | |
298 | ||
299 | assert(context); | |
300 | assert(ident); | |
301 | ||
302 | i = fixup_input(context, socket_fd); | |
303 | o = fixup_output(context, socket_fd); | |
304 | ||
305 | /* This expects the input is already set up */ | |
306 | ||
307 | switch (o) { | |
308 | ||
309 | case EXEC_OUTPUT_INHERIT: | |
310 | ||
311 | /* If the input is connected to a terminal, inherit that... */ | |
312 | if (is_terminal_input(i) || i == EXEC_INPUT_SOCKET) | |
313 | return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO; | |
314 | ||
315 | return STDIN_FILENO; | |
316 | ||
317 | case EXEC_OUTPUT_NULL: | |
318 | return open_null_as(O_WRONLY, STDOUT_FILENO); | |
319 | ||
320 | case EXEC_OUTPUT_TTY: | |
321 | if (is_terminal_input(i)) | |
322 | return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO; | |
323 | ||
324 | /* We don't reset the terminal if this is just about output */ | |
325 | return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO); | |
326 | ||
327 | case EXEC_OUTPUT_SYSLOG: | |
328 | case EXEC_OUTPUT_KERNEL: | |
329 | return connect_logger_as(context, o, ident, STDOUT_FILENO); | |
330 | ||
331 | case EXEC_OUTPUT_SOCKET: | |
332 | assert(socket_fd >= 0); | |
333 | return dup2(socket_fd, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO; | |
334 | ||
335 | default: | |
336 | assert_not_reached("Unknown output type"); | |
337 | } | |
338 | } | |
339 | ||
340 | static int setup_error(const ExecContext *context, int socket_fd, const char *ident) { | |
341 | ExecOutput o, e; | |
342 | ExecInput i; | |
343 | ||
344 | assert(context); | |
345 | assert(ident); | |
346 | ||
347 | i = fixup_input(context, socket_fd); | |
348 | o = fixup_output(context, socket_fd); | |
349 | e = fixup_error(context, socket_fd); | |
350 | ||
351 | /* This expects the input and output are already set up */ | |
352 | ||
353 | /* Don't change the stderr file descriptor if we inherit all | |
354 | * the way and are not on a tty */ | |
355 | if (e == EXEC_OUTPUT_INHERIT && | |
356 | o == EXEC_OUTPUT_INHERIT && | |
357 | !is_terminal_input(i)) | |
358 | return STDERR_FILENO; | |
359 | ||
360 | /* Duplicate form stdout if possible */ | |
361 | if (e == o || e == EXEC_OUTPUT_INHERIT) | |
362 | return dup2(STDOUT_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO; | |
363 | ||
364 | switch (e) { | |
365 | ||
366 | case EXEC_OUTPUT_NULL: | |
367 | return open_null_as(O_WRONLY, STDERR_FILENO); | |
368 | ||
369 | case EXEC_OUTPUT_TTY: | |
370 | if (is_terminal_input(i)) | |
371 | return dup2(STDIN_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO; | |
372 | ||
373 | /* We don't reset the terminal if this is just about output */ | |
374 | return open_terminal_as(tty_path(context), O_WRONLY, STDERR_FILENO); | |
375 | ||
376 | case EXEC_OUTPUT_SYSLOG: | |
377 | case EXEC_OUTPUT_KERNEL: | |
378 | return connect_logger_as(context, e, ident, STDERR_FILENO); | |
379 | ||
380 | case EXEC_OUTPUT_SOCKET: | |
381 | assert(socket_fd >= 0); | |
382 | return dup2(socket_fd, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO; | |
383 | ||
384 | default: | |
385 | assert_not_reached("Unknown error type"); | |
386 | } | |
387 | } | |
388 | ||
389 | static int chown_terminal(int fd, uid_t uid) { | |
390 | struct stat st; | |
391 | ||
392 | assert(fd >= 0); | |
393 | ||
394 | /* This might fail. What matters are the results. */ | |
395 | fchown(fd, uid, -1); | |
396 | fchmod(fd, TTY_MODE); | |
397 | ||
398 | if (fstat(fd, &st) < 0) | |
399 | return -errno; | |
400 | ||
401 | if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE) | |
402 | return -EPERM; | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
407 | static int setup_confirm_stdio(const ExecContext *context, | |
408 | int *_saved_stdin, | |
409 | int *_saved_stdout) { | |
410 | int fd = -1, saved_stdin, saved_stdout = -1, r; | |
411 | ||
412 | assert(context); | |
413 | assert(_saved_stdin); | |
414 | assert(_saved_stdout); | |
415 | ||
416 | /* This returns positive EXIT_xxx return values instead of | |
417 | * negative errno style values! */ | |
418 | ||
419 | if ((saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3)) < 0) | |
420 | return EXIT_STDIN; | |
421 | ||
422 | if ((saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3)) < 0) { | |
423 | r = EXIT_STDOUT; | |
424 | goto fail; | |
425 | } | |
426 | ||
427 | if ((fd = acquire_terminal( | |
428 | tty_path(context), | |
429 | context->std_input == EXEC_INPUT_TTY_FAIL, | |
430 | context->std_input == EXEC_INPUT_TTY_FORCE)) < 0) { | |
431 | r = EXIT_STDIN; | |
432 | goto fail; | |
433 | } | |
434 | ||
435 | if (chown_terminal(fd, getuid()) < 0) { | |
436 | r = EXIT_STDIN; | |
437 | goto fail; | |
438 | } | |
439 | ||
440 | if (dup2(fd, STDIN_FILENO) < 0) { | |
441 | r = EXIT_STDIN; | |
442 | goto fail; | |
443 | } | |
444 | ||
445 | if (dup2(fd, STDOUT_FILENO) < 0) { | |
446 | r = EXIT_STDOUT; | |
447 | goto fail; | |
448 | } | |
449 | ||
450 | if (fd >= 2) | |
451 | close_nointr_nofail(fd); | |
452 | ||
453 | *_saved_stdin = saved_stdin; | |
454 | *_saved_stdout = saved_stdout; | |
455 | ||
456 | return 0; | |
457 | ||
458 | fail: | |
459 | if (saved_stdout >= 0) | |
460 | close_nointr_nofail(saved_stdout); | |
461 | ||
462 | if (saved_stdin >= 0) | |
463 | close_nointr_nofail(saved_stdin); | |
464 | ||
465 | if (fd >= 0) | |
466 | close_nointr_nofail(fd); | |
467 | ||
468 | return r; | |
469 | } | |
470 | ||
471 | static int restore_confirm_stdio(const ExecContext *context, | |
472 | int *saved_stdin, | |
473 | int *saved_stdout, | |
474 | bool *keep_stdin, | |
475 | bool *keep_stdout) { | |
476 | ||
477 | assert(context); | |
478 | assert(saved_stdin); | |
479 | assert(*saved_stdin >= 0); | |
480 | assert(saved_stdout); | |
481 | assert(*saved_stdout >= 0); | |
482 | ||
483 | /* This returns positive EXIT_xxx return values instead of | |
484 | * negative errno style values! */ | |
485 | ||
486 | if (is_terminal_input(context->std_input)) { | |
487 | ||
488 | /* The service wants terminal input. */ | |
489 | ||
490 | *keep_stdin = true; | |
491 | *keep_stdout = | |
492 | context->std_output == EXEC_OUTPUT_INHERIT || | |
493 | context->std_output == EXEC_OUTPUT_TTY; | |
494 | ||
495 | } else { | |
496 | /* If the service doesn't want a controlling terminal, | |
497 | * then we need to get rid entirely of what we have | |
498 | * already. */ | |
499 | ||
500 | if (release_terminal() < 0) | |
501 | return EXIT_STDIN; | |
502 | ||
503 | if (dup2(*saved_stdin, STDIN_FILENO) < 0) | |
504 | return EXIT_STDIN; | |
505 | ||
506 | if (dup2(*saved_stdout, STDOUT_FILENO) < 0) | |
507 | return EXIT_STDOUT; | |
508 | ||
509 | *keep_stdout = *keep_stdin = false; | |
510 | } | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
515 | static int get_group_creds(const char *groupname, gid_t *gid) { | |
516 | struct group *g; | |
517 | unsigned long lu; | |
518 | ||
519 | assert(groupname); | |
520 | assert(gid); | |
521 | ||
522 | /* We enforce some special rules for gid=0: in order to avoid | |
523 | * NSS lookups for root we hardcode its data. */ | |
524 | ||
525 | if (streq(groupname, "root") || streq(groupname, "0")) { | |
526 | *gid = 0; | |
527 | return 0; | |
528 | } | |
529 | ||
530 | if (safe_atolu(groupname, &lu) >= 0) { | |
531 | errno = 0; | |
532 | g = getgrgid((gid_t) lu); | |
533 | } else { | |
534 | errno = 0; | |
535 | g = getgrnam(groupname); | |
536 | } | |
537 | ||
538 | if (!g) | |
539 | return errno != 0 ? -errno : -ESRCH; | |
540 | ||
541 | *gid = g->gr_gid; | |
542 | return 0; | |
543 | } | |
544 | ||
545 | static int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) { | |
546 | struct passwd *p; | |
547 | unsigned long lu; | |
548 | ||
549 | assert(username); | |
550 | assert(*username); | |
551 | assert(uid); | |
552 | assert(gid); | |
553 | assert(home); | |
554 | ||
555 | /* We enforce some special rules for uid=0: in order to avoid | |
556 | * NSS lookups for root we hardcode its data. */ | |
557 | ||
558 | if (streq(*username, "root") || streq(*username, "0")) { | |
559 | *username = "root"; | |
560 | *uid = 0; | |
561 | *gid = 0; | |
562 | *home = "/root"; | |
563 | return 0; | |
564 | } | |
565 | ||
566 | if (safe_atolu(*username, &lu) >= 0) { | |
567 | errno = 0; | |
568 | p = getpwuid((uid_t) lu); | |
569 | ||
570 | /* If there are multiple users with the same id, make | |
571 | * sure to leave $USER to the configured value instead | |
572 | * of the first occurence in the database. However if | |
573 | * the uid was configured by a numeric uid, then let's | |
574 | * pick the real username from /etc/passwd. */ | |
575 | if (*username && p) | |
576 | *username = p->pw_name; | |
577 | } else { | |
578 | errno = 0; | |
579 | p = getpwnam(*username); | |
580 | } | |
581 | ||
582 | if (!p) | |
583 | return errno != 0 ? -errno : -ESRCH; | |
584 | ||
585 | *uid = p->pw_uid; | |
586 | *gid = p->pw_gid; | |
587 | *home = p->pw_dir; | |
588 | return 0; | |
589 | } | |
590 | ||
591 | static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) { | |
592 | bool keep_groups = false; | |
593 | int r; | |
594 | ||
595 | assert(context); | |
596 | ||
597 | /* Lookup and ser GID and supplementary group list. Here too | |
598 | * we avoid NSS lookups for gid=0. */ | |
599 | ||
600 | if (context->group || username) { | |
601 | ||
602 | if (context->group) | |
603 | if ((r = get_group_creds(context->group, &gid)) < 0) | |
604 | return r; | |
605 | ||
606 | /* First step, initialize groups from /etc/groups */ | |
607 | if (username && gid != 0) { | |
608 | if (initgroups(username, gid) < 0) | |
609 | return -errno; | |
610 | ||
611 | keep_groups = true; | |
612 | } | |
613 | ||
614 | /* Second step, set our gids */ | |
615 | if (setresgid(gid, gid, gid) < 0) | |
616 | return -errno; | |
617 | } | |
618 | ||
619 | if (context->supplementary_groups) { | |
620 | int ngroups_max, k; | |
621 | gid_t *gids; | |
622 | char **i; | |
623 | ||
624 | /* Final step, initialize any manually set supplementary groups */ | |
625 | ngroups_max = (int) sysconf(_SC_NGROUPS_MAX); | |
626 | ||
627 | if (!(gids = new(gid_t, ngroups_max))) | |
628 | return -ENOMEM; | |
629 | ||
630 | if (keep_groups) { | |
631 | if ((k = getgroups(ngroups_max, gids)) < 0) { | |
632 | free(gids); | |
633 | return -errno; | |
634 | } | |
635 | } else | |
636 | k = 0; | |
637 | ||
638 | STRV_FOREACH(i, context->supplementary_groups) { | |
639 | ||
640 | if (k >= ngroups_max) { | |
641 | free(gids); | |
642 | return -E2BIG; | |
643 | } | |
644 | ||
645 | if ((r = get_group_creds(*i, gids+k)) < 0) { | |
646 | free(gids); | |
647 | return r; | |
648 | } | |
649 | ||
650 | k++; | |
651 | } | |
652 | ||
653 | if (setgroups(k, gids) < 0) { | |
654 | free(gids); | |
655 | return -errno; | |
656 | } | |
657 | ||
658 | free(gids); | |
659 | } | |
660 | ||
661 | return 0; | |
662 | } | |
663 | ||
664 | static int enforce_user(const ExecContext *context, uid_t uid) { | |
665 | int r; | |
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) { | |
672 | cap_t d; | |
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, whiel we drop priviliges. */ | |
681 | if (uid != 0) { | |
682 | int sb = context->secure_bits|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 capabilites. This will reduce | |
690 | * the capabilities to the minimum we need. */ | |
691 | ||
692 | if (!(d = cap_dup(context->capabilities))) | |
693 | return -errno; | |
694 | ||
695 | if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 || | |
696 | cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) { | |
697 | r = -errno; | |
698 | cap_free(d); | |
699 | return r; | |
700 | } | |
701 | ||
702 | if (cap_set_proc(d) < 0) { | |
703 | r = -errno; | |
704 | cap_free(d); | |
705 | return r; | |
706 | } | |
707 | ||
708 | cap_free(d); | |
709 | } | |
710 | ||
711 | /* Third step: actually set the uids */ | |
712 | if (setresuid(uid, uid, uid) < 0) | |
713 | return -errno; | |
714 | ||
715 | /* At this point we should have all necessary capabilities but | |
716 | are otherwise a normal user. However, the caps might got | |
717 | corrupted due to the setresuid() so we need clean them up | |
718 | later. This is done outside of this call. */ | |
719 | ||
720 | return 0; | |
721 | } | |
722 | ||
723 | int exec_spawn(ExecCommand *command, | |
724 | char **argv, | |
725 | const ExecContext *context, | |
726 | int fds[], unsigned n_fds, | |
727 | bool apply_permissions, | |
728 | bool apply_chroot, | |
729 | bool confirm_spawn, | |
730 | CGroupBonding *cgroup_bondings, | |
731 | pid_t *ret) { | |
732 | ||
733 | pid_t pid; | |
734 | int r; | |
735 | char *line; | |
736 | int socket_fd; | |
737 | ||
738 | assert(command); | |
739 | assert(context); | |
740 | assert(ret); | |
741 | assert(fds || n_fds <= 0); | |
742 | ||
743 | if (context->std_input == EXEC_INPUT_SOCKET || | |
744 | context->std_output == EXEC_OUTPUT_SOCKET || | |
745 | context->std_error == EXEC_OUTPUT_SOCKET) { | |
746 | ||
747 | if (n_fds != 1) | |
748 | return -EINVAL; | |
749 | ||
750 | socket_fd = fds[0]; | |
751 | ||
752 | fds = NULL; | |
753 | n_fds = 0; | |
754 | } else | |
755 | socket_fd = -1; | |
756 | ||
757 | if (!argv) | |
758 | argv = command->argv; | |
759 | ||
760 | if (!(line = exec_command_line(argv))) | |
761 | return -ENOMEM; | |
762 | ||
763 | log_debug("About to execute: %s", line); | |
764 | free(line); | |
765 | ||
766 | if (cgroup_bondings) | |
767 | if ((r = cgroup_bonding_realize_list(cgroup_bondings))) | |
768 | return r; | |
769 | ||
770 | if ((pid = fork()) < 0) | |
771 | return -errno; | |
772 | ||
773 | if (pid == 0) { | |
774 | int i; | |
775 | sigset_t ss; | |
776 | const char *username = NULL, *home = NULL; | |
777 | uid_t uid = (uid_t) -1; | |
778 | gid_t gid = (gid_t) -1; | |
779 | char **our_env = NULL, **final_env = NULL; | |
780 | unsigned n_env = 0; | |
781 | int saved_stdout = -1, saved_stdin = -1; | |
782 | bool keep_stdout = false, keep_stdin = false; | |
783 | ||
784 | /* child */ | |
785 | ||
786 | reset_all_signal_handlers(); | |
787 | ||
788 | if (sigemptyset(&ss) < 0 || | |
789 | sigprocmask(SIG_SETMASK, &ss, NULL) < 0) { | |
790 | r = EXIT_SIGNAL_MASK; | |
791 | goto fail; | |
792 | } | |
793 | ||
794 | if (!context->no_setsid) | |
795 | if (setsid() < 0) { | |
796 | r = EXIT_SETSID; | |
797 | goto fail; | |
798 | } | |
799 | ||
800 | if (confirm_spawn) { | |
801 | char response; | |
802 | ||
803 | /* Set up terminal for the question */ | |
804 | if ((r = setup_confirm_stdio(context, | |
805 | &saved_stdin, &saved_stdout))) | |
806 | goto fail; | |
807 | ||
808 | /* Now ask the question. */ | |
809 | if (!(line = exec_command_line(argv))) { | |
810 | r = EXIT_MEMORY; | |
811 | goto fail; | |
812 | } | |
813 | ||
814 | r = ask(&response, "yns", "Execute %s? [Yes, No, Skip] ", line); | |
815 | free(line); | |
816 | ||
817 | if (r < 0 || response == 'n') { | |
818 | r = EXIT_CONFIRM; | |
819 | goto fail; | |
820 | } else if (response == 's') { | |
821 | r = 0; | |
822 | goto fail; | |
823 | } | |
824 | ||
825 | /* Release terminal for the question */ | |
826 | if ((r = restore_confirm_stdio(context, | |
827 | &saved_stdin, &saved_stdout, | |
828 | &keep_stdin, &keep_stdout))) | |
829 | goto fail; | |
830 | } | |
831 | ||
832 | if (!keep_stdin) | |
833 | if (setup_input(context, socket_fd) < 0) { | |
834 | r = EXIT_STDIN; | |
835 | goto fail; | |
836 | } | |
837 | ||
838 | if (!keep_stdout) | |
839 | if (setup_output(context, socket_fd, file_name_from_path(command->path)) < 0) { | |
840 | r = EXIT_STDOUT; | |
841 | goto fail; | |
842 | } | |
843 | ||
844 | if (setup_error(context, socket_fd, file_name_from_path(command->path)) < 0) { | |
845 | r = EXIT_STDERR; | |
846 | goto fail; | |
847 | } | |
848 | ||
849 | if (cgroup_bondings) | |
850 | if ((r = cgroup_bonding_install_list(cgroup_bondings, 0)) < 0) { | |
851 | r = EXIT_CGROUP; | |
852 | goto fail; | |
853 | } | |
854 | ||
855 | if (context->oom_adjust_set) { | |
856 | char t[16]; | |
857 | ||
858 | snprintf(t, sizeof(t), "%i", context->oom_adjust); | |
859 | char_array_0(t); | |
860 | ||
861 | if (write_one_line_file("/proc/self/oom_adj", t) < 0) { | |
862 | r = EXIT_OOM_ADJUST; | |
863 | goto fail; | |
864 | } | |
865 | } | |
866 | ||
867 | if (context->nice_set) | |
868 | if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) { | |
869 | r = EXIT_NICE; | |
870 | goto fail; | |
871 | } | |
872 | ||
873 | if (context->cpu_sched_set) { | |
874 | struct sched_param param; | |
875 | ||
876 | zero(param); | |
877 | param.sched_priority = context->cpu_sched_priority; | |
878 | ||
879 | if (sched_setscheduler(0, context->cpu_sched_policy | | |
880 | (context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), ¶m) < 0) { | |
881 | r = EXIT_SETSCHEDULER; | |
882 | goto fail; | |
883 | } | |
884 | } | |
885 | ||
886 | if (context->cpu_affinity_set) | |
887 | if (sched_setaffinity(0, sizeof(context->cpu_affinity), &context->cpu_affinity) < 0) { | |
888 | r = EXIT_CPUAFFINITY; | |
889 | goto fail; | |
890 | } | |
891 | ||
892 | if (context->ioprio_set) | |
893 | if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) { | |
894 | r = EXIT_IOPRIO; | |
895 | goto fail; | |
896 | } | |
897 | ||
898 | if (context->timer_slack_ns_set) | |
899 | if (prctl(PR_SET_TIMERSLACK, context->timer_slack_ns_set) < 0) { | |
900 | r = EXIT_TIMERSLACK; | |
901 | goto fail; | |
902 | } | |
903 | ||
904 | if (strv_length(context->read_write_dirs) > 0 || | |
905 | strv_length(context->read_only_dirs) > 0 || | |
906 | strv_length(context->inaccessible_dirs) > 0 || | |
907 | context->mount_flags != MS_SHARED || | |
908 | context->private_tmp) | |
909 | if ((r = setup_namespace( | |
910 | context->read_write_dirs, | |
911 | context->read_only_dirs, | |
912 | context->inaccessible_dirs, | |
913 | context->private_tmp, | |
914 | context->mount_flags)) < 0) | |
915 | goto fail; | |
916 | ||
917 | if (context->user) { | |
918 | username = context->user; | |
919 | if (get_user_creds(&username, &uid, &gid, &home) < 0) { | |
920 | r = EXIT_USER; | |
921 | goto fail; | |
922 | } | |
923 | ||
924 | if (is_terminal_input(context->std_input)) | |
925 | if (chown_terminal(STDIN_FILENO, uid) < 0) { | |
926 | r = EXIT_STDIN; | |
927 | goto fail; | |
928 | } | |
929 | } | |
930 | ||
931 | if (apply_permissions) | |
932 | if (enforce_groups(context, username, uid) < 0) { | |
933 | r = EXIT_GROUP; | |
934 | goto fail; | |
935 | } | |
936 | ||
937 | umask(context->umask); | |
938 | ||
939 | if (apply_chroot) { | |
940 | if (context->root_directory) | |
941 | if (chroot(context->root_directory) < 0) { | |
942 | r = EXIT_CHROOT; | |
943 | goto fail; | |
944 | } | |
945 | ||
946 | if (chdir(context->working_directory ? context->working_directory : "/") < 0) { | |
947 | r = EXIT_CHDIR; | |
948 | goto fail; | |
949 | } | |
950 | } else { | |
951 | ||
952 | char *d; | |
953 | ||
954 | if (asprintf(&d, "%s/%s", | |
955 | context->root_directory ? context->root_directory : "", | |
956 | context->working_directory ? context->working_directory : "") < 0) { | |
957 | r = EXIT_MEMORY; | |
958 | goto fail; | |
959 | } | |
960 | ||
961 | if (chdir(d) < 0) { | |
962 | free(d); | |
963 | r = EXIT_CHDIR; | |
964 | goto fail; | |
965 | } | |
966 | ||
967 | free(d); | |
968 | } | |
969 | ||
970 | if (close_all_fds(fds, n_fds) < 0 || | |
971 | shift_fds(fds, n_fds) < 0 || | |
972 | flags_fds(fds, n_fds, context->non_blocking) < 0) { | |
973 | r = EXIT_FDS; | |
974 | goto fail; | |
975 | } | |
976 | ||
977 | if (apply_permissions) { | |
978 | ||
979 | for (i = 0; i < RLIMIT_NLIMITS; i++) { | |
980 | if (!context->rlimit[i]) | |
981 | continue; | |
982 | ||
983 | if (setrlimit(i, context->rlimit[i]) < 0) { | |
984 | r = EXIT_LIMITS; | |
985 | goto fail; | |
986 | } | |
987 | } | |
988 | ||
989 | if (context->user) | |
990 | if (enforce_user(context, uid) < 0) { | |
991 | r = EXIT_USER; | |
992 | goto fail; | |
993 | } | |
994 | ||
995 | /* PR_GET_SECUREBITS is not priviliged, while | |
996 | * PR_SET_SECUREBITS is. So to suppress | |
997 | * potential EPERMs we'll try not to call | |
998 | * PR_SET_SECUREBITS unless necessary. */ | |
999 | if (prctl(PR_GET_SECUREBITS) != context->secure_bits) | |
1000 | if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) { | |
1001 | r = EXIT_SECUREBITS; | |
1002 | goto fail; | |
1003 | } | |
1004 | ||
1005 | if (context->capabilities) | |
1006 | if (cap_set_proc(context->capabilities) < 0) { | |
1007 | r = EXIT_CAPABILITIES; | |
1008 | goto fail; | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | if (!(our_env = new0(char*, 6))) { | |
1013 | r = EXIT_MEMORY; | |
1014 | goto fail; | |
1015 | } | |
1016 | ||
1017 | if (n_fds > 0) | |
1018 | if (asprintf(our_env + n_env++, "LISTEN_PID=%llu", (unsigned long long) getpid()) < 0 || | |
1019 | asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0) { | |
1020 | r = EXIT_MEMORY; | |
1021 | goto fail; | |
1022 | } | |
1023 | ||
1024 | if (home) | |
1025 | if (asprintf(our_env + n_env++, "HOME=%s", home) < 0) { | |
1026 | r = EXIT_MEMORY; | |
1027 | goto fail; | |
1028 | } | |
1029 | ||
1030 | if (username) | |
1031 | if (asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 || | |
1032 | asprintf(our_env + n_env++, "USER=%s", username) < 0) { | |
1033 | r = EXIT_MEMORY; | |
1034 | goto fail; | |
1035 | } | |
1036 | ||
1037 | if (!(final_env = strv_env_merge(environ, our_env, context->environment, NULL))) { | |
1038 | r = EXIT_MEMORY; | |
1039 | goto fail; | |
1040 | } | |
1041 | ||
1042 | execve(command->path, argv, final_env); | |
1043 | r = EXIT_EXEC; | |
1044 | ||
1045 | fail: | |
1046 | strv_free(our_env); | |
1047 | strv_free(final_env); | |
1048 | ||
1049 | if (saved_stdin >= 0) | |
1050 | close_nointr_nofail(saved_stdin); | |
1051 | ||
1052 | if (saved_stdout >= 0) | |
1053 | close_nointr_nofail(saved_stdout); | |
1054 | ||
1055 | _exit(r); | |
1056 | } | |
1057 | ||
1058 | /* We add the new process to the cgroup both in the child (so | |
1059 | * that we can be sure that no user code is ever executed | |
1060 | * outside of the cgroup) and in the parent (so that we can be | |
1061 | * sure that when we kill the cgroup the process will be | |
1062 | * killed too). */ | |
1063 | if (cgroup_bondings) | |
1064 | if ((r = cgroup_bonding_install_list(cgroup_bondings, pid)) < 0) { | |
1065 | r = EXIT_CGROUP; | |
1066 | goto fail; | |
1067 | } | |
1068 | ||
1069 | log_debug("Forked %s as %llu", command->path, (unsigned long long) pid); | |
1070 | ||
1071 | command->exec_status.pid = pid; | |
1072 | command->exec_status.start_timestamp = now(CLOCK_REALTIME); | |
1073 | ||
1074 | *ret = pid; | |
1075 | return 0; | |
1076 | } | |
1077 | ||
1078 | void exec_context_init(ExecContext *c) { | |
1079 | assert(c); | |
1080 | ||
1081 | c->umask = 0002; | |
1082 | c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0); | |
1083 | c->cpu_sched_policy = SCHED_OTHER; | |
1084 | c->syslog_priority = LOG_DAEMON|LOG_INFO; | |
1085 | c->mount_flags = MS_SHARED; | |
1086 | } | |
1087 | ||
1088 | void exec_context_done(ExecContext *c) { | |
1089 | unsigned l; | |
1090 | ||
1091 | assert(c); | |
1092 | ||
1093 | strv_free(c->environment); | |
1094 | c->environment = NULL; | |
1095 | ||
1096 | for (l = 0; l < ELEMENTSOF(c->rlimit); l++) { | |
1097 | free(c->rlimit[l]); | |
1098 | c->rlimit[l] = NULL; | |
1099 | } | |
1100 | ||
1101 | free(c->working_directory); | |
1102 | c->working_directory = NULL; | |
1103 | free(c->root_directory); | |
1104 | c->root_directory = NULL; | |
1105 | ||
1106 | free(c->tty_path); | |
1107 | c->tty_path = NULL; | |
1108 | ||
1109 | free(c->syslog_identifier); | |
1110 | c->syslog_identifier = NULL; | |
1111 | ||
1112 | free(c->user); | |
1113 | c->user = NULL; | |
1114 | ||
1115 | free(c->group); | |
1116 | c->group = NULL; | |
1117 | ||
1118 | strv_free(c->supplementary_groups); | |
1119 | c->supplementary_groups = NULL; | |
1120 | ||
1121 | if (c->capabilities) { | |
1122 | cap_free(c->capabilities); | |
1123 | c->capabilities = NULL; | |
1124 | } | |
1125 | ||
1126 | strv_free(c->read_only_dirs); | |
1127 | c->read_only_dirs = NULL; | |
1128 | ||
1129 | strv_free(c->read_write_dirs); | |
1130 | c->read_write_dirs = NULL; | |
1131 | ||
1132 | strv_free(c->inaccessible_dirs); | |
1133 | c->inaccessible_dirs = NULL; | |
1134 | } | |
1135 | ||
1136 | void exec_command_done(ExecCommand *c) { | |
1137 | assert(c); | |
1138 | ||
1139 | free(c->path); | |
1140 | c->path = NULL; | |
1141 | ||
1142 | strv_free(c->argv); | |
1143 | c->argv = NULL; | |
1144 | } | |
1145 | ||
1146 | void exec_command_done_array(ExecCommand *c, unsigned n) { | |
1147 | unsigned i; | |
1148 | ||
1149 | for (i = 0; i < n; i++) | |
1150 | exec_command_done(c+i); | |
1151 | } | |
1152 | ||
1153 | void exec_command_free_list(ExecCommand *c) { | |
1154 | ExecCommand *i; | |
1155 | ||
1156 | while ((i = c)) { | |
1157 | LIST_REMOVE(ExecCommand, command, c, i); | |
1158 | exec_command_done(i); | |
1159 | free(i); | |
1160 | } | |
1161 | } | |
1162 | ||
1163 | void exec_command_free_array(ExecCommand **c, unsigned n) { | |
1164 | unsigned i; | |
1165 | ||
1166 | for (i = 0; i < n; i++) { | |
1167 | exec_command_free_list(c[i]); | |
1168 | c[i] = NULL; | |
1169 | } | |
1170 | } | |
1171 | ||
1172 | static void strv_fprintf(FILE *f, char **l) { | |
1173 | char **g; | |
1174 | ||
1175 | assert(f); | |
1176 | ||
1177 | STRV_FOREACH(g, l) | |
1178 | fprintf(f, " %s", *g); | |
1179 | } | |
1180 | ||
1181 | void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { | |
1182 | char ** e; | |
1183 | unsigned i; | |
1184 | ||
1185 | assert(c); | |
1186 | assert(f); | |
1187 | ||
1188 | if (!prefix) | |
1189 | prefix = ""; | |
1190 | ||
1191 | fprintf(f, | |
1192 | "%sUMask: %04o\n" | |
1193 | "%sWorkingDirectory: %s\n" | |
1194 | "%sRootDirectory: %s\n" | |
1195 | "%sNonBlocking: %s\n" | |
1196 | "%sPrivateTmp: %s\n", | |
1197 | prefix, c->umask, | |
1198 | prefix, c->working_directory ? c->working_directory : "/", | |
1199 | prefix, c->root_directory ? c->root_directory : "/", | |
1200 | prefix, yes_no(c->non_blocking), | |
1201 | prefix, yes_no(c->private_tmp)); | |
1202 | ||
1203 | if (c->environment) | |
1204 | for (e = c->environment; *e; e++) | |
1205 | fprintf(f, "%sEnvironment: %s\n", prefix, *e); | |
1206 | ||
1207 | if (c->nice_set) | |
1208 | fprintf(f, | |
1209 | "%sNice: %i\n", | |
1210 | prefix, c->nice); | |
1211 | ||
1212 | if (c->oom_adjust_set) | |
1213 | fprintf(f, | |
1214 | "%sOOMAdjust: %i\n", | |
1215 | prefix, c->oom_adjust); | |
1216 | ||
1217 | for (i = 0; i < RLIM_NLIMITS; i++) | |
1218 | if (c->rlimit[i]) | |
1219 | fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max); | |
1220 | ||
1221 | if (c->ioprio_set) | |
1222 | fprintf(f, | |
1223 | "%sIOSchedulingClass: %s\n" | |
1224 | "%sIOPriority: %i\n", | |
1225 | prefix, ioprio_class_to_string(IOPRIO_PRIO_CLASS(c->ioprio)), | |
1226 | prefix, (int) IOPRIO_PRIO_DATA(c->ioprio)); | |
1227 | ||
1228 | if (c->cpu_sched_set) | |
1229 | fprintf(f, | |
1230 | "%sCPUSchedulingPolicy: %s\n" | |
1231 | "%sCPUSchedulingPriority: %i\n" | |
1232 | "%sCPUSchedulingResetOnFork: %s\n", | |
1233 | prefix, sched_policy_to_string(c->cpu_sched_policy), | |
1234 | prefix, c->cpu_sched_priority, | |
1235 | prefix, yes_no(c->cpu_sched_reset_on_fork)); | |
1236 | ||
1237 | if (c->cpu_affinity_set) { | |
1238 | fprintf(f, "%sCPUAffinity:", prefix); | |
1239 | for (i = 0; i < CPU_SETSIZE; i++) | |
1240 | if (CPU_ISSET(i, &c->cpu_affinity)) | |
1241 | fprintf(f, " %i", i); | |
1242 | fputs("\n", f); | |
1243 | } | |
1244 | ||
1245 | if (c->timer_slack_ns_set) | |
1246 | fprintf(f, "%sTimerSlackNS: %lu\n", prefix, c->timer_slack_ns); | |
1247 | ||
1248 | fprintf(f, | |
1249 | "%sStandardInput: %s\n" | |
1250 | "%sStandardOutput: %s\n" | |
1251 | "%sStandardError: %s\n", | |
1252 | prefix, exec_input_to_string(c->std_input), | |
1253 | prefix, exec_output_to_string(c->std_output), | |
1254 | prefix, exec_output_to_string(c->std_error)); | |
1255 | ||
1256 | if (c->tty_path) | |
1257 | fprintf(f, | |
1258 | "%sTTYPath: %s\n", | |
1259 | prefix, c->tty_path); | |
1260 | ||
1261 | if (c->std_output == EXEC_OUTPUT_SYSLOG || c->std_output == EXEC_OUTPUT_KERNEL || | |
1262 | c->std_error == EXEC_OUTPUT_SYSLOG || c->std_error == EXEC_OUTPUT_KERNEL) | |
1263 | fprintf(f, | |
1264 | "%sSyslogFacility: %s\n" | |
1265 | "%sSyslogLevel: %s\n", | |
1266 | prefix, log_facility_to_string(LOG_FAC(c->syslog_priority)), | |
1267 | prefix, log_level_to_string(LOG_PRI(c->syslog_priority))); | |
1268 | ||
1269 | if (c->capabilities) { | |
1270 | char *t; | |
1271 | if ((t = cap_to_text(c->capabilities, NULL))) { | |
1272 | fprintf(f, "%sCapabilities: %s\n", | |
1273 | prefix, t); | |
1274 | cap_free(t); | |
1275 | } | |
1276 | } | |
1277 | ||
1278 | if (c->secure_bits) | |
1279 | fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n", | |
1280 | prefix, | |
1281 | (c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "", | |
1282 | (c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "", | |
1283 | (c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "", | |
1284 | (c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "", | |
1285 | (c->secure_bits & SECURE_NOROOT) ? " noroot" : "", | |
1286 | (c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : ""); | |
1287 | ||
1288 | if (c->capability_bounding_set_drop) { | |
1289 | fprintf(f, "%sCapabilityBoundingSetDrop:", prefix); | |
1290 | ||
1291 | for (i = 0; i <= CAP_LAST_CAP; i++) | |
1292 | if (c->capability_bounding_set_drop & (1 << i)) { | |
1293 | char *t; | |
1294 | ||
1295 | if ((t = cap_to_name(i))) { | |
1296 | fprintf(f, " %s", t); | |
1297 | free(t); | |
1298 | } | |
1299 | } | |
1300 | ||
1301 | fputs("\n", f); | |
1302 | } | |
1303 | ||
1304 | if (c->user) | |
1305 | fprintf(f, "%sUser: %s", prefix, c->user); | |
1306 | if (c->group) | |
1307 | fprintf(f, "%sGroup: %s", prefix, c->group); | |
1308 | ||
1309 | if (strv_length(c->supplementary_groups) > 0) { | |
1310 | fprintf(f, "%sSupplementaryGroups:", prefix); | |
1311 | strv_fprintf(f, c->supplementary_groups); | |
1312 | fputs("\n", f); | |
1313 | } | |
1314 | ||
1315 | if (strv_length(c->read_write_dirs) > 0) { | |
1316 | fprintf(f, "%sReadWriteDirs:", prefix); | |
1317 | strv_fprintf(f, c->read_write_dirs); | |
1318 | fputs("\n", f); | |
1319 | } | |
1320 | ||
1321 | if (strv_length(c->read_only_dirs) > 0) { | |
1322 | fprintf(f, "%sReadOnlyDirs:", prefix); | |
1323 | strv_fprintf(f, c->read_only_dirs); | |
1324 | fputs("\n", f); | |
1325 | } | |
1326 | ||
1327 | if (strv_length(c->inaccessible_dirs) > 0) { | |
1328 | fprintf(f, "%sInaccessibleDirs:", prefix); | |
1329 | strv_fprintf(f, c->inaccessible_dirs); | |
1330 | fputs("\n", f); | |
1331 | } | |
1332 | } | |
1333 | ||
1334 | void exec_status_fill(ExecStatus *s, pid_t pid, int code, int status) { | |
1335 | assert(s); | |
1336 | ||
1337 | s->pid = pid; | |
1338 | s->exit_timestamp = now(CLOCK_REALTIME); | |
1339 | ||
1340 | s->code = code; | |
1341 | s->status = status; | |
1342 | } | |
1343 | ||
1344 | void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) { | |
1345 | char buf[FORMAT_TIMESTAMP_MAX]; | |
1346 | ||
1347 | assert(s); | |
1348 | assert(f); | |
1349 | ||
1350 | if (!prefix) | |
1351 | prefix = ""; | |
1352 | ||
1353 | if (s->pid <= 0) | |
1354 | return; | |
1355 | ||
1356 | fprintf(f, | |
1357 | "%sPID: %llu\n", | |
1358 | prefix, (unsigned long long) s->pid); | |
1359 | ||
1360 | if (s->start_timestamp > 0) | |
1361 | fprintf(f, | |
1362 | "%sStart Timestamp: %s\n", | |
1363 | prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp)); | |
1364 | ||
1365 | if (s->exit_timestamp > 0) | |
1366 | fprintf(f, | |
1367 | "%sExit Timestamp: %s\n" | |
1368 | "%sExit Code: %s\n" | |
1369 | "%sExit Status: %i\n", | |
1370 | prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp), | |
1371 | prefix, sigchld_code_to_string(s->code), | |
1372 | prefix, s->status); | |
1373 | } | |
1374 | ||
1375 | char *exec_command_line(char **argv) { | |
1376 | size_t k; | |
1377 | char *n, *p, **a; | |
1378 | bool first = true; | |
1379 | ||
1380 | assert(argv); | |
1381 | ||
1382 | k = 1; | |
1383 | STRV_FOREACH(a, argv) | |
1384 | k += strlen(*a)+3; | |
1385 | ||
1386 | if (!(n = new(char, k))) | |
1387 | return NULL; | |
1388 | ||
1389 | p = n; | |
1390 | STRV_FOREACH(a, argv) { | |
1391 | ||
1392 | if (!first) | |
1393 | *(p++) = ' '; | |
1394 | else | |
1395 | first = false; | |
1396 | ||
1397 | if (strpbrk(*a, WHITESPACE)) { | |
1398 | *(p++) = '\''; | |
1399 | p = stpcpy(p, *a); | |
1400 | *(p++) = '\''; | |
1401 | } else | |
1402 | p = stpcpy(p, *a); | |
1403 | ||
1404 | } | |
1405 | ||
1406 | *p = 0; | |
1407 | ||
1408 | /* FIXME: this doesn't really handle arguments that have | |
1409 | * spaces and ticks in them */ | |
1410 | ||
1411 | return n; | |
1412 | } | |
1413 | ||
1414 | void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) { | |
1415 | char *p2; | |
1416 | const char *prefix2; | |
1417 | ||
1418 | char *cmd; | |
1419 | ||
1420 | assert(c); | |
1421 | assert(f); | |
1422 | ||
1423 | if (!prefix) | |
1424 | prefix = ""; | |
1425 | p2 = strappend(prefix, "\t"); | |
1426 | prefix2 = p2 ? p2 : prefix; | |
1427 | ||
1428 | cmd = exec_command_line(c->argv); | |
1429 | ||
1430 | fprintf(f, | |
1431 | "%sCommand Line: %s\n", | |
1432 | prefix, cmd ? cmd : strerror(ENOMEM)); | |
1433 | ||
1434 | free(cmd); | |
1435 | ||
1436 | exec_status_dump(&c->exec_status, f, prefix2); | |
1437 | ||
1438 | free(p2); | |
1439 | } | |
1440 | ||
1441 | void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) { | |
1442 | assert(f); | |
1443 | ||
1444 | if (!prefix) | |
1445 | prefix = ""; | |
1446 | ||
1447 | LIST_FOREACH(command, c, c) | |
1448 | exec_command_dump(c, f, prefix); | |
1449 | } | |
1450 | ||
1451 | void exec_command_append_list(ExecCommand **l, ExecCommand *e) { | |
1452 | ExecCommand *end; | |
1453 | ||
1454 | assert(l); | |
1455 | assert(e); | |
1456 | ||
1457 | if (*l) { | |
1458 | /* It's kinda important that we keep the order here */ | |
1459 | LIST_FIND_TAIL(ExecCommand, command, *l, end); | |
1460 | LIST_INSERT_AFTER(ExecCommand, command, *l, end, e); | |
1461 | } else | |
1462 | *l = e; | |
1463 | } | |
1464 | ||
1465 | int exec_command_set(ExecCommand *c, const char *path, ...) { | |
1466 | va_list ap; | |
1467 | char **l, *p; | |
1468 | ||
1469 | assert(c); | |
1470 | assert(path); | |
1471 | ||
1472 | va_start(ap, path); | |
1473 | l = strv_new_ap(path, ap); | |
1474 | va_end(ap); | |
1475 | ||
1476 | if (!l) | |
1477 | return -ENOMEM; | |
1478 | ||
1479 | if (!(p = strdup(path))) { | |
1480 | strv_free(l); | |
1481 | return -ENOMEM; | |
1482 | } | |
1483 | ||
1484 | free(c->path); | |
1485 | c->path = p; | |
1486 | ||
1487 | strv_free(c->argv); | |
1488 | c->argv = l; | |
1489 | ||
1490 | return 0; | |
1491 | } | |
1492 | ||
1493 | const char* exit_status_to_string(ExitStatus status) { | |
1494 | ||
1495 | /* We cast to int here, so that -Wenum doesn't complain that | |
1496 | * EXIT_SUCCESS/EXIT_FAILURE aren't in the enum */ | |
1497 | ||
1498 | switch ((int) status) { | |
1499 | ||
1500 | case EXIT_SUCCESS: | |
1501 | return "SUCCESS"; | |
1502 | ||
1503 | case EXIT_FAILURE: | |
1504 | return "FAILURE"; | |
1505 | ||
1506 | case EXIT_INVALIDARGUMENT: | |
1507 | return "INVALIDARGUMENT"; | |
1508 | ||
1509 | case EXIT_NOTIMPLEMENTED: | |
1510 | return "NOTIMPLEMENTED"; | |
1511 | ||
1512 | case EXIT_NOPERMISSION: | |
1513 | return "NOPERMISSION"; | |
1514 | ||
1515 | case EXIT_NOTINSTALLED: | |
1516 | return "NOTINSSTALLED"; | |
1517 | ||
1518 | case EXIT_NOTCONFIGURED: | |
1519 | return "NOTCONFIGURED"; | |
1520 | ||
1521 | case EXIT_NOTRUNNING: | |
1522 | return "NOTRUNNING"; | |
1523 | ||
1524 | case EXIT_CHDIR: | |
1525 | return "CHDIR"; | |
1526 | ||
1527 | case EXIT_NICE: | |
1528 | return "NICE"; | |
1529 | ||
1530 | case EXIT_FDS: | |
1531 | return "FDS"; | |
1532 | ||
1533 | case EXIT_EXEC: | |
1534 | return "EXEC"; | |
1535 | ||
1536 | case EXIT_MEMORY: | |
1537 | return "MEMORY"; | |
1538 | ||
1539 | case EXIT_LIMITS: | |
1540 | return "LIMITS"; | |
1541 | ||
1542 | case EXIT_OOM_ADJUST: | |
1543 | return "OOM_ADJUST"; | |
1544 | ||
1545 | case EXIT_SIGNAL_MASK: | |
1546 | return "SIGNAL_MASK"; | |
1547 | ||
1548 | case EXIT_STDIN: | |
1549 | return "STDIN"; | |
1550 | ||
1551 | case EXIT_STDOUT: | |
1552 | return "STDOUT"; | |
1553 | ||
1554 | case EXIT_CHROOT: | |
1555 | return "CHROOT"; | |
1556 | ||
1557 | case EXIT_IOPRIO: | |
1558 | return "IOPRIO"; | |
1559 | ||
1560 | case EXIT_TIMERSLACK: | |
1561 | return "TIMERSLACK"; | |
1562 | ||
1563 | case EXIT_SECUREBITS: | |
1564 | return "SECUREBITS"; | |
1565 | ||
1566 | case EXIT_SETSCHEDULER: | |
1567 | return "SETSCHEDULER"; | |
1568 | ||
1569 | case EXIT_CPUAFFINITY: | |
1570 | return "CPUAFFINITY"; | |
1571 | ||
1572 | case EXIT_GROUP: | |
1573 | return "GROUP"; | |
1574 | ||
1575 | case EXIT_USER: | |
1576 | return "USER"; | |
1577 | ||
1578 | case EXIT_CAPABILITIES: | |
1579 | return "CAPABILITIES"; | |
1580 | ||
1581 | case EXIT_CGROUP: | |
1582 | return "CGROUP"; | |
1583 | ||
1584 | case EXIT_SETSID: | |
1585 | return "SETSID"; | |
1586 | ||
1587 | case EXIT_CONFIRM: | |
1588 | return "CONFIRM"; | |
1589 | ||
1590 | case EXIT_STDERR: | |
1591 | return "STDERR"; | |
1592 | ||
1593 | default: | |
1594 | return NULL; | |
1595 | } | |
1596 | } | |
1597 | ||
1598 | static const char* const exec_input_table[_EXEC_INPUT_MAX] = { | |
1599 | [EXEC_INPUT_NULL] = "null", | |
1600 | [EXEC_INPUT_TTY] = "tty", | |
1601 | [EXEC_INPUT_TTY_FORCE] = "tty-force", | |
1602 | [EXEC_INPUT_TTY_FAIL] = "tty-fail", | |
1603 | [EXEC_INPUT_SOCKET] = "socket" | |
1604 | }; | |
1605 | ||
1606 | static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = { | |
1607 | [EXEC_OUTPUT_INHERIT] = "inherit", | |
1608 | [EXEC_OUTPUT_NULL] = "null", | |
1609 | [EXEC_OUTPUT_TTY] = "tty", | |
1610 | [EXEC_OUTPUT_SYSLOG] = "syslog", | |
1611 | [EXEC_OUTPUT_KERNEL] = "kernel", | |
1612 | [EXEC_OUTPUT_SOCKET] = "socket" | |
1613 | }; | |
1614 | ||
1615 | DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput); | |
1616 | ||
1617 | DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput); |