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Commit | Line | Data |
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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
5cb5a6ff | 2 | |
a7334b09 LP |
3 | /*** |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
a7334b09 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
a7334b09 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
a7334b09 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
5cb5a6ff | 22 | #include <assert.h> |
034c6ed7 LP |
23 | #include <dirent.h> |
24 | #include <errno.h> | |
25 | #include <fcntl.h> | |
26 | #include <unistd.h> | |
44d8db9e | 27 | #include <string.h> |
309bff19 | 28 | #include <signal.h> |
071830ff LP |
29 | #include <sys/socket.h> |
30 | #include <sys/un.h> | |
94f04347 | 31 | #include <sys/prctl.h> |
66ee3769 | 32 | #include <linux/sched.h> |
451a074f LP |
33 | #include <sys/types.h> |
34 | #include <sys/stat.h> | |
81a2b7ce LP |
35 | #include <grp.h> |
36 | #include <pwd.h> | |
15ae422b | 37 | #include <sys/mount.h> |
25e870b5 | 38 | #include <linux/fs.h> |
dd6c17b1 | 39 | #include <linux/oom.h> |
f2b68789 | 40 | #include <sys/poll.h> |
2bef10ab | 41 | #include <glob.h> |
ac45f971 | 42 | #include <sys/personality.h> |
d34cd374 | 43 | #include <libgen.h> |
2b6bf07d | 44 | #undef basename |
5cb5a6ff | 45 | |
5b6319dc LP |
46 | #ifdef HAVE_PAM |
47 | #include <security/pam_appl.h> | |
48 | #endif | |
49 | ||
7b52a628 MS |
50 | #ifdef HAVE_SELINUX |
51 | #include <selinux/selinux.h> | |
52 | #endif | |
53 | ||
17df7223 LP |
54 | #ifdef HAVE_SECCOMP |
55 | #include <seccomp.h> | |
56 | #endif | |
57 | ||
eef65bf3 MS |
58 | #ifdef HAVE_APPARMOR |
59 | #include <sys/apparmor.h> | |
60 | #endif | |
61 | ||
5cb5a6ff LP |
62 | #include "execute.h" |
63 | #include "strv.h" | |
64 | #include "macro.h" | |
d7832d2c | 65 | #include "capability.h" |
5cb5a6ff | 66 | #include "util.h" |
acbb0225 | 67 | #include "log.h" |
20ad4cfd | 68 | #include "sd-messages.h" |
9eba9da4 | 69 | #include "ioprio.h" |
94f04347 | 70 | #include "securebits.h" |
15ae422b | 71 | #include "namespace.h" |
d06dacd0 | 72 | #include "exit-status.h" |
dd6c17b1 | 73 | #include "missing.h" |
169c1bda | 74 | #include "utmp-wtmp.h" |
f6a6225e | 75 | #include "def.h" |
9eb977db | 76 | #include "path-util.h" |
4d1a6904 | 77 | #include "env-util.h" |
a5c32cff | 78 | #include "fileio.h" |
4ad49000 | 79 | #include "unit.h" |
f485606b | 80 | #include "async.h" |
0d3f7bb3 | 81 | #include "selinux-util.h" |
17df7223 | 82 | #include "errno-list.h" |
4298d0b5 | 83 | #include "af-list.h" |
e66cf1a3 | 84 | #include "mkdir.h" |
eef65bf3 | 85 | #include "apparmor-util.h" |
e44da745 | 86 | #include "bus-kernel.h" |
16115b0a | 87 | #include "label.h" |
5cb5a6ff | 88 | |
57183d11 LP |
89 | #ifdef HAVE_SECCOMP |
90 | #include "seccomp-util.h" | |
91 | #endif | |
92 | ||
e056b01d | 93 | #define IDLE_TIMEOUT_USEC (5*USEC_PER_SEC) |
31a7eb86 | 94 | #define IDLE_TIMEOUT2_USEC (1*USEC_PER_SEC) |
e6a26745 | 95 | |
02a51aba LP |
96 | /* This assumes there is a 'tty' group */ |
97 | #define TTY_MODE 0620 | |
98 | ||
531dca78 LP |
99 | #define SNDBUF_SIZE (8*1024*1024) |
100 | ||
034c6ed7 LP |
101 | static int shift_fds(int fds[], unsigned n_fds) { |
102 | int start, restart_from; | |
103 | ||
104 | if (n_fds <= 0) | |
105 | return 0; | |
106 | ||
a0d40ac5 LP |
107 | /* Modifies the fds array! (sorts it) */ |
108 | ||
034c6ed7 LP |
109 | assert(fds); |
110 | ||
111 | start = 0; | |
112 | for (;;) { | |
113 | int i; | |
114 | ||
115 | restart_from = -1; | |
116 | ||
117 | for (i = start; i < (int) n_fds; i++) { | |
118 | int nfd; | |
119 | ||
120 | /* Already at right index? */ | |
121 | if (fds[i] == i+3) | |
122 | continue; | |
123 | ||
124 | if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0) | |
125 | return -errno; | |
126 | ||
03e334a1 | 127 | safe_close(fds[i]); |
034c6ed7 LP |
128 | fds[i] = nfd; |
129 | ||
130 | /* Hmm, the fd we wanted isn't free? Then | |
131 | * let's remember that and try again from here*/ | |
132 | if (nfd != i+3 && restart_from < 0) | |
133 | restart_from = i; | |
134 | } | |
135 | ||
136 | if (restart_from < 0) | |
137 | break; | |
138 | ||
139 | start = restart_from; | |
140 | } | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
c2748801 | 145 | static int flags_fds(const int fds[], unsigned n_fds, bool nonblock) { |
47a71eed | 146 | unsigned i; |
e2c76839 | 147 | int r; |
47a71eed LP |
148 | |
149 | if (n_fds <= 0) | |
150 | return 0; | |
151 | ||
152 | assert(fds); | |
153 | ||
451a074f | 154 | /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */ |
47a71eed LP |
155 | |
156 | for (i = 0; i < n_fds; i++) { | |
47a71eed | 157 | |
e2c76839 LP |
158 | if ((r = fd_nonblock(fds[i], nonblock)) < 0) |
159 | return r; | |
47a71eed | 160 | |
451a074f LP |
161 | /* We unconditionally drop FD_CLOEXEC from the fds, |
162 | * since after all we want to pass these fds to our | |
163 | * children */ | |
47a71eed | 164 | |
e2c76839 LP |
165 | if ((r = fd_cloexec(fds[i], false)) < 0) |
166 | return r; | |
47a71eed LP |
167 | } |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
44a6b1b6 | 172 | _pure_ static const char *tty_path(const ExecContext *context) { |
80876c20 LP |
173 | assert(context); |
174 | ||
175 | if (context->tty_path) | |
176 | return context->tty_path; | |
177 | ||
178 | return "/dev/console"; | |
179 | } | |
180 | ||
9588bc32 | 181 | static void exec_context_tty_reset(const ExecContext *context) { |
6ea832a2 LP |
182 | assert(context); |
183 | ||
184 | if (context->tty_vhangup) | |
185 | terminal_vhangup(tty_path(context)); | |
186 | ||
187 | if (context->tty_reset) | |
188 | reset_terminal(tty_path(context)); | |
189 | ||
190 | if (context->tty_vt_disallocate && context->tty_path) | |
191 | vt_disallocate(context->tty_path); | |
192 | } | |
193 | ||
3a1286b6 MS |
194 | static bool is_terminal_output(ExecOutput o) { |
195 | return | |
196 | o == EXEC_OUTPUT_TTY || | |
197 | o == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
198 | o == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
199 | o == EXEC_OUTPUT_JOURNAL_AND_CONSOLE; | |
200 | } | |
201 | ||
80876c20 LP |
202 | static int open_null_as(int flags, int nfd) { |
203 | int fd, r; | |
071830ff | 204 | |
80876c20 | 205 | assert(nfd >= 0); |
071830ff | 206 | |
613b411c LP |
207 | fd = open("/dev/null", flags|O_NOCTTY); |
208 | if (fd < 0) | |
071830ff LP |
209 | return -errno; |
210 | ||
80876c20 LP |
211 | if (fd != nfd) { |
212 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 213 | safe_close(fd); |
80876c20 LP |
214 | } else |
215 | r = nfd; | |
071830ff | 216 | |
80876c20 | 217 | return r; |
071830ff LP |
218 | } |
219 | ||
62bca2c6 | 220 | static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, const char *unit_id, int nfd) { |
80876c20 | 221 | int fd, r; |
b92bea5d ZJS |
222 | union sockaddr_union sa = { |
223 | .un.sun_family = AF_UNIX, | |
224 | .un.sun_path = "/run/systemd/journal/stdout", | |
225 | }; | |
071830ff LP |
226 | |
227 | assert(context); | |
80876c20 LP |
228 | assert(output < _EXEC_OUTPUT_MAX); |
229 | assert(ident); | |
230 | assert(nfd >= 0); | |
071830ff | 231 | |
54fe0cdb LP |
232 | fd = socket(AF_UNIX, SOCK_STREAM, 0); |
233 | if (fd < 0) | |
80876c20 | 234 | return -errno; |
071830ff | 235 | |
54fe0cdb LP |
236 | r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)); |
237 | if (r < 0) { | |
03e334a1 | 238 | safe_close(fd); |
80876c20 LP |
239 | return -errno; |
240 | } | |
071830ff | 241 | |
80876c20 | 242 | if (shutdown(fd, SHUT_RD) < 0) { |
03e334a1 | 243 | safe_close(fd); |
80876c20 LP |
244 | return -errno; |
245 | } | |
071830ff | 246 | |
531dca78 LP |
247 | fd_inc_sndbuf(fd, SNDBUF_SIZE); |
248 | ||
80876c20 | 249 | dprintf(fd, |
62bca2c6 | 250 | "%s\n" |
80876c20 LP |
251 | "%s\n" |
252 | "%i\n" | |
54fe0cdb LP |
253 | "%i\n" |
254 | "%i\n" | |
255 | "%i\n" | |
4f4a1dbf | 256 | "%i\n", |
4f4a1dbf | 257 | context->syslog_identifier ? context->syslog_identifier : ident, |
62bca2c6 | 258 | unit_id, |
54fe0cdb LP |
259 | context->syslog_priority, |
260 | !!context->syslog_level_prefix, | |
261 | output == EXEC_OUTPUT_SYSLOG || output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE, | |
262 | output == EXEC_OUTPUT_KMSG || output == EXEC_OUTPUT_KMSG_AND_CONSOLE, | |
3a1286b6 | 263 | is_terminal_output(output)); |
80876c20 LP |
264 | |
265 | if (fd != nfd) { | |
266 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 267 | safe_close(fd); |
80876c20 LP |
268 | } else |
269 | r = nfd; | |
071830ff | 270 | |
80876c20 LP |
271 | return r; |
272 | } | |
273 | static int open_terminal_as(const char *path, mode_t mode, int nfd) { | |
274 | int fd, r; | |
071830ff | 275 | |
80876c20 LP |
276 | assert(path); |
277 | assert(nfd >= 0); | |
071830ff | 278 | |
80876c20 LP |
279 | if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0) |
280 | return fd; | |
071830ff | 281 | |
80876c20 LP |
282 | if (fd != nfd) { |
283 | r = dup2(fd, nfd) < 0 ? -errno : nfd; | |
03e334a1 | 284 | safe_close(fd); |
80876c20 LP |
285 | } else |
286 | r = nfd; | |
071830ff | 287 | |
80876c20 LP |
288 | return r; |
289 | } | |
071830ff | 290 | |
80876c20 LP |
291 | static bool is_terminal_input(ExecInput i) { |
292 | return | |
293 | i == EXEC_INPUT_TTY || | |
294 | i == EXEC_INPUT_TTY_FORCE || | |
295 | i == EXEC_INPUT_TTY_FAIL; | |
296 | } | |
071830ff | 297 | |
1e3ad081 LP |
298 | static int fixup_input(ExecInput std_input, int socket_fd, bool apply_tty_stdin) { |
299 | ||
300 | if (is_terminal_input(std_input) && !apply_tty_stdin) | |
301 | return EXEC_INPUT_NULL; | |
071830ff | 302 | |
03fd9c49 | 303 | if (std_input == EXEC_INPUT_SOCKET && socket_fd < 0) |
4f2d528d LP |
304 | return EXEC_INPUT_NULL; |
305 | ||
03fd9c49 | 306 | return std_input; |
4f2d528d LP |
307 | } |
308 | ||
03fd9c49 | 309 | static int fixup_output(ExecOutput std_output, int socket_fd) { |
4f2d528d | 310 | |
03fd9c49 | 311 | if (std_output == EXEC_OUTPUT_SOCKET && socket_fd < 0) |
4f2d528d LP |
312 | return EXEC_OUTPUT_INHERIT; |
313 | ||
03fd9c49 | 314 | return std_output; |
4f2d528d LP |
315 | } |
316 | ||
1e3ad081 | 317 | static int setup_input(const ExecContext *context, int socket_fd, bool apply_tty_stdin) { |
4f2d528d LP |
318 | ExecInput i; |
319 | ||
320 | assert(context); | |
321 | ||
1e3ad081 | 322 | i = fixup_input(context->std_input, socket_fd, apply_tty_stdin); |
4f2d528d LP |
323 | |
324 | switch (i) { | |
071830ff | 325 | |
80876c20 LP |
326 | case EXEC_INPUT_NULL: |
327 | return open_null_as(O_RDONLY, STDIN_FILENO); | |
328 | ||
329 | case EXEC_INPUT_TTY: | |
330 | case EXEC_INPUT_TTY_FORCE: | |
331 | case EXEC_INPUT_TTY_FAIL: { | |
332 | int fd, r; | |
071830ff | 333 | |
970edce6 ZJS |
334 | fd = acquire_terminal(tty_path(context), |
335 | i == EXEC_INPUT_TTY_FAIL, | |
336 | i == EXEC_INPUT_TTY_FORCE, | |
337 | false, | |
3a43da28 | 338 | USEC_INFINITY); |
970edce6 | 339 | if (fd < 0) |
80876c20 LP |
340 | return fd; |
341 | ||
342 | if (fd != STDIN_FILENO) { | |
343 | r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
03e334a1 | 344 | safe_close(fd); |
80876c20 LP |
345 | } else |
346 | r = STDIN_FILENO; | |
347 | ||
348 | return r; | |
349 | } | |
350 | ||
4f2d528d LP |
351 | case EXEC_INPUT_SOCKET: |
352 | return dup2(socket_fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO; | |
353 | ||
80876c20 LP |
354 | default: |
355 | assert_not_reached("Unknown input type"); | |
356 | } | |
357 | } | |
358 | ||
eb17e935 | 359 | static int setup_output(const ExecContext *context, int fileno, int socket_fd, const char *ident, const char *unit_id, bool apply_tty_stdin) { |
4f2d528d LP |
360 | ExecOutput o; |
361 | ExecInput i; | |
47c1d80d | 362 | int r; |
4f2d528d | 363 | |
80876c20 LP |
364 | assert(context); |
365 | assert(ident); | |
366 | ||
1e3ad081 | 367 | i = fixup_input(context->std_input, socket_fd, apply_tty_stdin); |
03fd9c49 | 368 | o = fixup_output(context->std_output, socket_fd); |
4f2d528d | 369 | |
eb17e935 MS |
370 | if (fileno == STDERR_FILENO) { |
371 | ExecOutput e; | |
372 | e = fixup_output(context->std_error, socket_fd); | |
80876c20 | 373 | |
eb17e935 MS |
374 | /* This expects the input and output are already set up */ |
375 | ||
376 | /* Don't change the stderr file descriptor if we inherit all | |
377 | * the way and are not on a tty */ | |
378 | if (e == EXEC_OUTPUT_INHERIT && | |
379 | o == EXEC_OUTPUT_INHERIT && | |
380 | i == EXEC_INPUT_NULL && | |
381 | !is_terminal_input(context->std_input) && | |
382 | getppid () != 1) | |
383 | return fileno; | |
384 | ||
385 | /* Duplicate from stdout if possible */ | |
386 | if (e == o || e == EXEC_OUTPUT_INHERIT) | |
387 | return dup2(STDOUT_FILENO, fileno) < 0 ? -errno : fileno; | |
071830ff | 388 | |
eb17e935 | 389 | o = e; |
80876c20 | 390 | |
eb17e935 | 391 | } else if (o == EXEC_OUTPUT_INHERIT) { |
21d21ea4 LP |
392 | /* If input got downgraded, inherit the original value */ |
393 | if (i == EXEC_INPUT_NULL && is_terminal_input(context->std_input)) | |
eb17e935 | 394 | return open_terminal_as(tty_path(context), O_WRONLY, fileno); |
21d21ea4 | 395 | |
acb591e4 | 396 | /* If the input is connected to anything that's not a /dev/null, inherit that... */ |
ff876e28 | 397 | if (i != EXEC_INPUT_NULL) |
eb17e935 | 398 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; |
071830ff | 399 | |
acb591e4 LP |
400 | /* If we are not started from PID 1 we just inherit STDOUT from our parent process. */ |
401 | if (getppid() != 1) | |
eb17e935 | 402 | return fileno; |
94f04347 | 403 | |
eb17e935 MS |
404 | /* We need to open /dev/null here anew, to get the right access mode. */ |
405 | return open_null_as(O_WRONLY, fileno); | |
071830ff | 406 | } |
94f04347 | 407 | |
eb17e935 | 408 | switch (o) { |
80876c20 LP |
409 | |
410 | case EXEC_OUTPUT_NULL: | |
eb17e935 | 411 | return open_null_as(O_WRONLY, fileno); |
80876c20 LP |
412 | |
413 | case EXEC_OUTPUT_TTY: | |
4f2d528d | 414 | if (is_terminal_input(i)) |
eb17e935 | 415 | return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno; |
80876c20 LP |
416 | |
417 | /* We don't reset the terminal if this is just about output */ | |
eb17e935 | 418 | return open_terminal_as(tty_path(context), O_WRONLY, fileno); |
80876c20 LP |
419 | |
420 | case EXEC_OUTPUT_SYSLOG: | |
28dbc1e8 | 421 | case EXEC_OUTPUT_SYSLOG_AND_CONSOLE: |
9a6bca7a | 422 | case EXEC_OUTPUT_KMSG: |
28dbc1e8 | 423 | case EXEC_OUTPUT_KMSG_AND_CONSOLE: |
706343f4 LP |
424 | case EXEC_OUTPUT_JOURNAL: |
425 | case EXEC_OUTPUT_JOURNAL_AND_CONSOLE: | |
eb17e935 | 426 | r = connect_logger_as(context, o, ident, unit_id, fileno); |
47c1d80d | 427 | if (r < 0) { |
80cbda35 MS |
428 | log_struct_unit(LOG_CRIT, unit_id, |
429 | "MESSAGE=Failed to connect std%s of %s to the journal socket: %s", | |
eb17e935 | 430 | fileno == STDOUT_FILENO ? "out" : "err", |
80cbda35 MS |
431 | unit_id, strerror(-r), |
432 | "ERRNO=%d", -r, | |
433 | NULL); | |
eb17e935 | 434 | r = open_null_as(O_WRONLY, fileno); |
47c1d80d MS |
435 | } |
436 | return r; | |
4f2d528d LP |
437 | |
438 | case EXEC_OUTPUT_SOCKET: | |
439 | assert(socket_fd >= 0); | |
eb17e935 | 440 | return dup2(socket_fd, fileno) < 0 ? -errno : fileno; |
94f04347 LP |
441 | |
442 | default: | |
80876c20 | 443 | assert_not_reached("Unknown error type"); |
94f04347 | 444 | } |
071830ff LP |
445 | } |
446 | ||
02a51aba LP |
447 | static int chown_terminal(int fd, uid_t uid) { |
448 | struct stat st; | |
449 | ||
450 | assert(fd >= 0); | |
02a51aba LP |
451 | |
452 | /* This might fail. What matters are the results. */ | |
bab45044 LP |
453 | (void) fchown(fd, uid, -1); |
454 | (void) fchmod(fd, TTY_MODE); | |
02a51aba LP |
455 | |
456 | if (fstat(fd, &st) < 0) | |
457 | return -errno; | |
458 | ||
d8b4e2e9 | 459 | if (st.st_uid != uid || (st.st_mode & 0777) != TTY_MODE) |
02a51aba LP |
460 | return -EPERM; |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
af6da548 | 465 | static int setup_confirm_stdio(int *_saved_stdin, |
80876c20 LP |
466 | int *_saved_stdout) { |
467 | int fd = -1, saved_stdin, saved_stdout = -1, r; | |
468 | ||
80876c20 LP |
469 | assert(_saved_stdin); |
470 | assert(_saved_stdout); | |
471 | ||
af6da548 LP |
472 | saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3); |
473 | if (saved_stdin < 0) | |
474 | return -errno; | |
80876c20 | 475 | |
af6da548 LP |
476 | saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3); |
477 | if (saved_stdout < 0) { | |
478 | r = errno; | |
80876c20 LP |
479 | goto fail; |
480 | } | |
481 | ||
af6da548 LP |
482 | fd = acquire_terminal( |
483 | "/dev/console", | |
484 | false, | |
485 | false, | |
486 | false, | |
487 | DEFAULT_CONFIRM_USEC); | |
488 | if (fd < 0) { | |
489 | r = fd; | |
80876c20 LP |
490 | goto fail; |
491 | } | |
492 | ||
af6da548 LP |
493 | r = chown_terminal(fd, getuid()); |
494 | if (r < 0) | |
02a51aba | 495 | goto fail; |
02a51aba | 496 | |
80876c20 | 497 | if (dup2(fd, STDIN_FILENO) < 0) { |
af6da548 | 498 | r = -errno; |
80876c20 LP |
499 | goto fail; |
500 | } | |
501 | ||
502 | if (dup2(fd, STDOUT_FILENO) < 0) { | |
af6da548 | 503 | r = -errno; |
80876c20 LP |
504 | goto fail; |
505 | } | |
506 | ||
507 | if (fd >= 2) | |
03e334a1 | 508 | safe_close(fd); |
80876c20 LP |
509 | |
510 | *_saved_stdin = saved_stdin; | |
511 | *_saved_stdout = saved_stdout; | |
512 | ||
513 | return 0; | |
514 | ||
515 | fail: | |
03e334a1 LP |
516 | safe_close(saved_stdout); |
517 | safe_close(saved_stdin); | |
518 | safe_close(fd); | |
80876c20 LP |
519 | |
520 | return r; | |
521 | } | |
522 | ||
44b601bc | 523 | _printf_(1, 2) static int write_confirm_message(const char *format, ...) { |
03e334a1 | 524 | _cleanup_close_ int fd = -1; |
af6da548 | 525 | va_list ap; |
80876c20 | 526 | |
af6da548 | 527 | assert(format); |
80876c20 | 528 | |
af6da548 LP |
529 | fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); |
530 | if (fd < 0) | |
531 | return fd; | |
80876c20 | 532 | |
af6da548 LP |
533 | va_start(ap, format); |
534 | vdprintf(fd, format, ap); | |
535 | va_end(ap); | |
80876c20 | 536 | |
af6da548 LP |
537 | return 0; |
538 | } | |
80876c20 | 539 | |
af6da548 LP |
540 | static int restore_confirm_stdio(int *saved_stdin, |
541 | int *saved_stdout) { | |
80876c20 | 542 | |
af6da548 | 543 | int r = 0; |
80876c20 | 544 | |
af6da548 LP |
545 | assert(saved_stdin); |
546 | assert(saved_stdout); | |
547 | ||
548 | release_terminal(); | |
549 | ||
550 | if (*saved_stdin >= 0) | |
80876c20 | 551 | if (dup2(*saved_stdin, STDIN_FILENO) < 0) |
af6da548 | 552 | r = -errno; |
80876c20 | 553 | |
af6da548 | 554 | if (*saved_stdout >= 0) |
80876c20 | 555 | if (dup2(*saved_stdout, STDOUT_FILENO) < 0) |
af6da548 | 556 | r = -errno; |
80876c20 | 557 | |
03e334a1 LP |
558 | safe_close(*saved_stdin); |
559 | safe_close(*saved_stdout); | |
af6da548 LP |
560 | |
561 | return r; | |
562 | } | |
563 | ||
564 | static int ask_for_confirmation(char *response, char **argv) { | |
565 | int saved_stdout = -1, saved_stdin = -1, r; | |
e1d75803 | 566 | _cleanup_free_ char *line = NULL; |
af6da548 LP |
567 | |
568 | r = setup_confirm_stdio(&saved_stdin, &saved_stdout); | |
569 | if (r < 0) | |
570 | return r; | |
571 | ||
572 | line = exec_command_line(argv); | |
573 | if (!line) | |
574 | return -ENOMEM; | |
575 | ||
418b9be5 | 576 | r = ask_char(response, "yns", "Execute %s? [Yes, No, Skip] ", line); |
af6da548 LP |
577 | |
578 | restore_confirm_stdio(&saved_stdin, &saved_stdout); | |
579 | ||
580 | return r; | |
80876c20 LP |
581 | } |
582 | ||
81a2b7ce LP |
583 | static int enforce_groups(const ExecContext *context, const char *username, gid_t gid) { |
584 | bool keep_groups = false; | |
585 | int r; | |
586 | ||
587 | assert(context); | |
588 | ||
35b8ca3a | 589 | /* Lookup and set GID and supplementary group list. Here too |
81a2b7ce LP |
590 | * we avoid NSS lookups for gid=0. */ |
591 | ||
592 | if (context->group || username) { | |
593 | ||
4b67834e LP |
594 | if (context->group) { |
595 | const char *g = context->group; | |
596 | ||
597 | if ((r = get_group_creds(&g, &gid)) < 0) | |
81a2b7ce | 598 | return r; |
4b67834e | 599 | } |
81a2b7ce LP |
600 | |
601 | /* First step, initialize groups from /etc/groups */ | |
602 | if (username && gid != 0) { | |
603 | if (initgroups(username, gid) < 0) | |
604 | return -errno; | |
605 | ||
606 | keep_groups = true; | |
607 | } | |
608 | ||
609 | /* Second step, set our gids */ | |
610 | if (setresgid(gid, gid, gid) < 0) | |
611 | return -errno; | |
612 | } | |
613 | ||
614 | if (context->supplementary_groups) { | |
615 | int ngroups_max, k; | |
616 | gid_t *gids; | |
617 | char **i; | |
618 | ||
619 | /* Final step, initialize any manually set supplementary groups */ | |
da19d5c1 | 620 | assert_se((ngroups_max = (int) sysconf(_SC_NGROUPS_MAX)) > 0); |
81a2b7ce LP |
621 | |
622 | if (!(gids = new(gid_t, ngroups_max))) | |
623 | return -ENOMEM; | |
624 | ||
625 | if (keep_groups) { | |
626 | if ((k = getgroups(ngroups_max, gids)) < 0) { | |
627 | free(gids); | |
628 | return -errno; | |
629 | } | |
630 | } else | |
631 | k = 0; | |
632 | ||
633 | STRV_FOREACH(i, context->supplementary_groups) { | |
4b67834e | 634 | const char *g; |
81a2b7ce LP |
635 | |
636 | if (k >= ngroups_max) { | |
637 | free(gids); | |
638 | return -E2BIG; | |
639 | } | |
640 | ||
4b67834e LP |
641 | g = *i; |
642 | r = get_group_creds(&g, gids+k); | |
643 | if (r < 0) { | |
81a2b7ce LP |
644 | free(gids); |
645 | return r; | |
646 | } | |
647 | ||
648 | k++; | |
649 | } | |
650 | ||
651 | if (setgroups(k, gids) < 0) { | |
652 | free(gids); | |
653 | return -errno; | |
654 | } | |
655 | ||
656 | free(gids); | |
657 | } | |
658 | ||
659 | return 0; | |
660 | } | |
661 | ||
662 | static int enforce_user(const ExecContext *context, uid_t uid) { | |
81a2b7ce LP |
663 | assert(context); |
664 | ||
665 | /* Sets (but doesn't lookup) the uid and make sure we keep the | |
666 | * capabilities while doing so. */ | |
667 | ||
668 | if (context->capabilities) { | |
5ce70e5b | 669 | _cleanup_cap_free_ cap_t d = NULL; |
81a2b7ce LP |
670 | static const cap_value_t bits[] = { |
671 | CAP_SETUID, /* Necessary so that we can run setresuid() below */ | |
672 | CAP_SETPCAP /* Necessary so that we can set PR_SET_SECUREBITS later on */ | |
673 | }; | |
674 | ||
675 | /* First step: If we need to keep capabilities but | |
676 | * drop privileges we need to make sure we keep our | |
cbb21cca | 677 | * caps, while we drop privileges. */ |
693ced48 | 678 | if (uid != 0) { |
cbb21cca | 679 | int sb = context->secure_bits | 1<<SECURE_KEEP_CAPS; |
693ced48 LP |
680 | |
681 | if (prctl(PR_GET_SECUREBITS) != sb) | |
682 | if (prctl(PR_SET_SECUREBITS, sb) < 0) | |
683 | return -errno; | |
684 | } | |
81a2b7ce | 685 | |
35b8ca3a | 686 | /* Second step: set the capabilities. This will reduce |
81a2b7ce LP |
687 | * the capabilities to the minimum we need. */ |
688 | ||
5ce70e5b ZJS |
689 | d = cap_dup(context->capabilities); |
690 | if (!d) | |
81a2b7ce LP |
691 | return -errno; |
692 | ||
693 | if (cap_set_flag(d, CAP_EFFECTIVE, ELEMENTSOF(bits), bits, CAP_SET) < 0 || | |
5ce70e5b ZJS |
694 | cap_set_flag(d, CAP_PERMITTED, ELEMENTSOF(bits), bits, CAP_SET) < 0) |
695 | return -errno; | |
81a2b7ce | 696 | |
5ce70e5b ZJS |
697 | if (cap_set_proc(d) < 0) |
698 | return -errno; | |
81a2b7ce LP |
699 | } |
700 | ||
701 | /* Third step: actually set the uids */ | |
702 | if (setresuid(uid, uid, uid) < 0) | |
703 | return -errno; | |
704 | ||
705 | /* At this point we should have all necessary capabilities but | |
706 | are otherwise a normal user. However, the caps might got | |
707 | corrupted due to the setresuid() so we need clean them up | |
708 | later. This is done outside of this call. */ | |
709 | ||
710 | return 0; | |
711 | } | |
712 | ||
5b6319dc LP |
713 | #ifdef HAVE_PAM |
714 | ||
715 | static int null_conv( | |
716 | int num_msg, | |
717 | const struct pam_message **msg, | |
718 | struct pam_response **resp, | |
719 | void *appdata_ptr) { | |
720 | ||
721 | /* We don't support conversations */ | |
722 | ||
723 | return PAM_CONV_ERR; | |
724 | } | |
725 | ||
726 | static int setup_pam( | |
727 | const char *name, | |
728 | const char *user, | |
940c5210 | 729 | uid_t uid, |
5b6319dc LP |
730 | const char *tty, |
731 | char ***pam_env, | |
732 | int fds[], unsigned n_fds) { | |
733 | ||
734 | static const struct pam_conv conv = { | |
735 | .conv = null_conv, | |
736 | .appdata_ptr = NULL | |
737 | }; | |
738 | ||
739 | pam_handle_t *handle = NULL; | |
740 | sigset_t ss, old_ss; | |
741 | int pam_code = PAM_SUCCESS; | |
9ba35398 | 742 | int err; |
5b6319dc LP |
743 | char **e = NULL; |
744 | bool close_session = false; | |
745 | pid_t pam_pid = 0, parent_pid; | |
970edce6 | 746 | int flags = 0; |
5b6319dc LP |
747 | |
748 | assert(name); | |
749 | assert(user); | |
750 | assert(pam_env); | |
751 | ||
752 | /* We set up PAM in the parent process, then fork. The child | |
35b8ca3a | 753 | * will then stay around until killed via PR_GET_PDEATHSIG or |
5b6319dc LP |
754 | * systemd via the cgroup logic. It will then remove the PAM |
755 | * session again. The parent process will exec() the actual | |
756 | * daemon. We do things this way to ensure that the main PID | |
757 | * of the daemon is the one we initially fork()ed. */ | |
758 | ||
970edce6 ZJS |
759 | if (log_get_max_level() < LOG_PRI(LOG_DEBUG)) |
760 | flags |= PAM_SILENT; | |
761 | ||
f546241b ZJS |
762 | pam_code = pam_start(name, user, &conv, &handle); |
763 | if (pam_code != PAM_SUCCESS) { | |
5b6319dc LP |
764 | handle = NULL; |
765 | goto fail; | |
766 | } | |
767 | ||
f546241b ZJS |
768 | if (tty) { |
769 | pam_code = pam_set_item(handle, PAM_TTY, tty); | |
770 | if (pam_code != PAM_SUCCESS) | |
5b6319dc | 771 | goto fail; |
f546241b | 772 | } |
5b6319dc | 773 | |
970edce6 | 774 | pam_code = pam_acct_mgmt(handle, flags); |
f546241b | 775 | if (pam_code != PAM_SUCCESS) |
5b6319dc LP |
776 | goto fail; |
777 | ||
970edce6 | 778 | pam_code = pam_open_session(handle, flags); |
f546241b | 779 | if (pam_code != PAM_SUCCESS) |
5b6319dc LP |
780 | goto fail; |
781 | ||
782 | close_session = true; | |
783 | ||
f546241b ZJS |
784 | e = pam_getenvlist(handle); |
785 | if (!e) { | |
5b6319dc LP |
786 | pam_code = PAM_BUF_ERR; |
787 | goto fail; | |
788 | } | |
789 | ||
790 | /* Block SIGTERM, so that we know that it won't get lost in | |
791 | * the child */ | |
792 | if (sigemptyset(&ss) < 0 || | |
793 | sigaddset(&ss, SIGTERM) < 0 || | |
794 | sigprocmask(SIG_BLOCK, &ss, &old_ss) < 0) | |
795 | goto fail; | |
796 | ||
797 | parent_pid = getpid(); | |
798 | ||
f546241b ZJS |
799 | pam_pid = fork(); |
800 | if (pam_pid < 0) | |
5b6319dc LP |
801 | goto fail; |
802 | ||
803 | if (pam_pid == 0) { | |
804 | int sig; | |
805 | int r = EXIT_PAM; | |
806 | ||
807 | /* The child's job is to reset the PAM session on | |
808 | * termination */ | |
809 | ||
810 | /* This string must fit in 10 chars (i.e. the length | |
5d6b1584 LP |
811 | * of "/sbin/init"), to look pretty in /bin/ps */ |
812 | rename_process("(sd-pam)"); | |
5b6319dc LP |
813 | |
814 | /* Make sure we don't keep open the passed fds in this | |
815 | child. We assume that otherwise only those fds are | |
816 | open here that have been opened by PAM. */ | |
817 | close_many(fds, n_fds); | |
818 | ||
940c5210 AK |
819 | /* Drop privileges - we don't need any to pam_close_session |
820 | * and this will make PR_SET_PDEATHSIG work in most cases. | |
821 | * If this fails, ignore the error - but expect sd-pam threads | |
822 | * to fail to exit normally */ | |
823 | if (setresuid(uid, uid, uid) < 0) | |
824 | log_error("Error: Failed to setresuid() in sd-pam: %s", strerror(-r)); | |
825 | ||
826 | /* Wait until our parent died. This will only work if | |
827 | * the above setresuid() succeeds, otherwise the kernel | |
828 | * will not allow unprivileged parents kill their privileged | |
829 | * children this way. We rely on the control groups kill logic | |
5b6319dc LP |
830 | * to do the rest for us. */ |
831 | if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) | |
832 | goto child_finish; | |
833 | ||
834 | /* Check if our parent process might already have | |
835 | * died? */ | |
836 | if (getppid() == parent_pid) { | |
3dead8d9 LP |
837 | for (;;) { |
838 | if (sigwait(&ss, &sig) < 0) { | |
839 | if (errno == EINTR) | |
840 | continue; | |
841 | ||
842 | goto child_finish; | |
843 | } | |
5b6319dc | 844 | |
3dead8d9 LP |
845 | assert(sig == SIGTERM); |
846 | break; | |
847 | } | |
5b6319dc LP |
848 | } |
849 | ||
3dead8d9 | 850 | /* If our parent died we'll end the session */ |
f546241b | 851 | if (getppid() != parent_pid) { |
970edce6 | 852 | pam_code = pam_close_session(handle, flags); |
f546241b | 853 | if (pam_code != PAM_SUCCESS) |
5b6319dc | 854 | goto child_finish; |
f546241b | 855 | } |
5b6319dc LP |
856 | |
857 | r = 0; | |
858 | ||
859 | child_finish: | |
970edce6 | 860 | pam_end(handle, pam_code | flags); |
5b6319dc LP |
861 | _exit(r); |
862 | } | |
863 | ||
864 | /* If the child was forked off successfully it will do all the | |
865 | * cleanups, so forget about the handle here. */ | |
866 | handle = NULL; | |
867 | ||
3b8bddde | 868 | /* Unblock SIGTERM again in the parent */ |
5b6319dc LP |
869 | if (sigprocmask(SIG_SETMASK, &old_ss, NULL) < 0) |
870 | goto fail; | |
871 | ||
872 | /* We close the log explicitly here, since the PAM modules | |
873 | * might have opened it, but we don't want this fd around. */ | |
874 | closelog(); | |
875 | ||
aa87e624 LP |
876 | *pam_env = e; |
877 | e = NULL; | |
878 | ||
5b6319dc LP |
879 | return 0; |
880 | ||
881 | fail: | |
970edce6 ZJS |
882 | if (pam_code != PAM_SUCCESS) { |
883 | log_error("PAM failed: %s", pam_strerror(handle, pam_code)); | |
9ba35398 | 884 | err = -EPERM; /* PAM errors do not map to errno */ |
970edce6 ZJS |
885 | } else { |
886 | log_error("PAM failed: %m"); | |
9ba35398 | 887 | err = -errno; |
970edce6 | 888 | } |
9ba35398 | 889 | |
5b6319dc LP |
890 | if (handle) { |
891 | if (close_session) | |
970edce6 | 892 | pam_code = pam_close_session(handle, flags); |
5b6319dc | 893 | |
970edce6 | 894 | pam_end(handle, pam_code | flags); |
5b6319dc LP |
895 | } |
896 | ||
897 | strv_free(e); | |
898 | ||
899 | closelog(); | |
900 | ||
430c18ed | 901 | if (pam_pid > 1) { |
5b6319dc | 902 | kill(pam_pid, SIGTERM); |
430c18ed LP |
903 | kill(pam_pid, SIGCONT); |
904 | } | |
5b6319dc | 905 | |
9ba35398 | 906 | return err; |
5b6319dc LP |
907 | } |
908 | #endif | |
909 | ||
5d6b1584 LP |
910 | static void rename_process_from_path(const char *path) { |
911 | char process_name[11]; | |
912 | const char *p; | |
913 | size_t l; | |
914 | ||
915 | /* This resulting string must fit in 10 chars (i.e. the length | |
916 | * of "/sbin/init") to look pretty in /bin/ps */ | |
917 | ||
2b6bf07d | 918 | p = basename(path); |
5d6b1584 LP |
919 | if (isempty(p)) { |
920 | rename_process("(...)"); | |
921 | return; | |
922 | } | |
923 | ||
924 | l = strlen(p); | |
925 | if (l > 8) { | |
926 | /* The end of the process name is usually more | |
927 | * interesting, since the first bit might just be | |
928 | * "systemd-" */ | |
929 | p = p + l - 8; | |
930 | l = 8; | |
931 | } | |
932 | ||
933 | process_name[0] = '('; | |
934 | memcpy(process_name+1, p, l); | |
935 | process_name[1+l] = ')'; | |
936 | process_name[1+l+1] = 0; | |
937 | ||
938 | rename_process(process_name); | |
939 | } | |
940 | ||
c0467cf3 | 941 | #ifdef HAVE_SECCOMP |
17df7223 | 942 | |
822a5960 | 943 | static int apply_seccomp(const ExecContext *c) { |
17df7223 LP |
944 | uint32_t negative_action, action; |
945 | scmp_filter_ctx *seccomp; | |
c0467cf3 RC |
946 | Iterator i; |
947 | void *id; | |
17df7223 | 948 | int r; |
8351ceae | 949 | |
c0467cf3 | 950 | assert(c); |
8351ceae | 951 | |
17df7223 LP |
952 | negative_action = c->syscall_errno == 0 ? SCMP_ACT_KILL : SCMP_ACT_ERRNO(c->syscall_errno); |
953 | ||
954 | seccomp = seccomp_init(c->syscall_whitelist ? negative_action : SCMP_ACT_ALLOW); | |
955 | if (!seccomp) | |
956 | return -ENOMEM; | |
8351ceae | 957 | |
e9642be2 LP |
958 | if (c->syscall_archs) { |
959 | ||
960 | SET_FOREACH(id, c->syscall_archs, i) { | |
961 | r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1); | |
962 | if (r == -EEXIST) | |
963 | continue; | |
7c66bae2 LP |
964 | if (r < 0) |
965 | goto finish; | |
e9642be2 | 966 | } |
e9642be2 | 967 | |
7c66bae2 | 968 | } else { |
e9642be2 | 969 | r = seccomp_add_secondary_archs(seccomp); |
7c66bae2 LP |
970 | if (r < 0) |
971 | goto finish; | |
57183d11 | 972 | } |
8351ceae | 973 | |
57183d11 | 974 | action = c->syscall_whitelist ? SCMP_ACT_ALLOW : negative_action; |
17df7223 LP |
975 | SET_FOREACH(id, c->syscall_filter, i) { |
976 | r = seccomp_rule_add(seccomp, action, PTR_TO_INT(id) - 1, 0); | |
7c66bae2 LP |
977 | if (r < 0) |
978 | goto finish; | |
c0467cf3 | 979 | } |
8351ceae | 980 | |
7c66bae2 LP |
981 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); |
982 | if (r < 0) | |
983 | goto finish; | |
984 | ||
17df7223 | 985 | r = seccomp_load(seccomp); |
7c66bae2 LP |
986 | |
987 | finish: | |
17df7223 | 988 | seccomp_release(seccomp); |
4298d0b5 LP |
989 | return r; |
990 | } | |
991 | ||
822a5960 | 992 | static int apply_address_families(const ExecContext *c) { |
4298d0b5 LP |
993 | scmp_filter_ctx *seccomp; |
994 | Iterator i; | |
995 | int r; | |
996 | ||
997 | assert(c); | |
998 | ||
999 | seccomp = seccomp_init(SCMP_ACT_ALLOW); | |
1000 | if (!seccomp) | |
1001 | return -ENOMEM; | |
1002 | ||
1003 | r = seccomp_add_secondary_archs(seccomp); | |
1004 | if (r < 0) | |
1005 | goto finish; | |
1006 | ||
1007 | if (c->address_families_whitelist) { | |
1008 | int af, first = 0, last = 0; | |
1009 | void *afp; | |
1010 | ||
1011 | /* If this is a whitelist, we first block the address | |
1012 | * families that are out of range and then everything | |
1013 | * that is not in the set. First, we find the lowest | |
1014 | * and highest address family in the set. */ | |
1015 | ||
1016 | SET_FOREACH(afp, c->address_families, i) { | |
1017 | af = PTR_TO_INT(afp); | |
17df7223 | 1018 | |
4298d0b5 LP |
1019 | if (af <= 0 || af >= af_max()) |
1020 | continue; | |
1021 | ||
1022 | if (first == 0 || af < first) | |
1023 | first = af; | |
1024 | ||
1025 | if (last == 0 || af > last) | |
1026 | last = af; | |
1027 | } | |
1028 | ||
1029 | assert((first == 0) == (last == 0)); | |
1030 | ||
1031 | if (first == 0) { | |
1032 | ||
1033 | /* No entries in the valid range, block everything */ | |
1034 | r = seccomp_rule_add( | |
1035 | seccomp, | |
1036 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1037 | SCMP_SYS(socket), | |
1038 | 0); | |
1039 | if (r < 0) | |
1040 | goto finish; | |
1041 | ||
1042 | } else { | |
1043 | ||
1044 | /* Block everything below the first entry */ | |
1045 | r = seccomp_rule_add( | |
1046 | seccomp, | |
1047 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1048 | SCMP_SYS(socket), | |
1049 | 1, | |
1050 | SCMP_A0(SCMP_CMP_LT, first)); | |
1051 | if (r < 0) | |
1052 | goto finish; | |
1053 | ||
1054 | /* Block everything above the last entry */ | |
1055 | r = seccomp_rule_add( | |
1056 | seccomp, | |
1057 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1058 | SCMP_SYS(socket), | |
1059 | 1, | |
1060 | SCMP_A0(SCMP_CMP_GT, last)); | |
1061 | if (r < 0) | |
1062 | goto finish; | |
1063 | ||
1064 | /* Block everything between the first and last | |
1065 | * entry */ | |
1066 | for (af = 1; af < af_max(); af++) { | |
1067 | ||
1068 | if (set_contains(c->address_families, INT_TO_PTR(af))) | |
1069 | continue; | |
1070 | ||
1071 | r = seccomp_rule_add( | |
1072 | seccomp, | |
1073 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1074 | SCMP_SYS(socket), | |
1075 | 1, | |
1076 | SCMP_A0(SCMP_CMP_EQ, af)); | |
1077 | if (r < 0) | |
1078 | goto finish; | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | } else { | |
1083 | void *af; | |
1084 | ||
1085 | /* If this is a blacklist, then generate one rule for | |
1086 | * each address family that are then combined in OR | |
1087 | * checks. */ | |
1088 | ||
1089 | SET_FOREACH(af, c->address_families, i) { | |
1090 | ||
1091 | r = seccomp_rule_add( | |
1092 | seccomp, | |
1093 | SCMP_ACT_ERRNO(EPROTONOSUPPORT), | |
1094 | SCMP_SYS(socket), | |
1095 | 1, | |
1096 | SCMP_A0(SCMP_CMP_EQ, PTR_TO_INT(af))); | |
1097 | if (r < 0) | |
1098 | goto finish; | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); | |
1103 | if (r < 0) | |
1104 | goto finish; | |
1105 | ||
1106 | r = seccomp_load(seccomp); | |
1107 | ||
1108 | finish: | |
1109 | seccomp_release(seccomp); | |
17df7223 | 1110 | return r; |
8351ceae | 1111 | } |
4298d0b5 | 1112 | |
c0467cf3 | 1113 | #endif |
8351ceae | 1114 | |
31a7eb86 ZJS |
1115 | static void do_idle_pipe_dance(int idle_pipe[4]) { |
1116 | assert(idle_pipe); | |
1117 | ||
03e334a1 LP |
1118 | |
1119 | safe_close(idle_pipe[1]); | |
1120 | safe_close(idle_pipe[2]); | |
31a7eb86 ZJS |
1121 | |
1122 | if (idle_pipe[0] >= 0) { | |
1123 | int r; | |
1124 | ||
1125 | r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC); | |
1126 | ||
1127 | if (idle_pipe[3] >= 0 && r == 0 /* timeout */) { | |
1128 | /* Signal systemd that we are bored and want to continue. */ | |
1129 | write(idle_pipe[3], "x", 1); | |
1130 | ||
1131 | /* Wait for systemd to react to the signal above. */ | |
1132 | fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC); | |
1133 | } | |
1134 | ||
03e334a1 | 1135 | safe_close(idle_pipe[0]); |
31a7eb86 ZJS |
1136 | |
1137 | } | |
1138 | ||
03e334a1 | 1139 | safe_close(idle_pipe[3]); |
31a7eb86 ZJS |
1140 | } |
1141 | ||
7cae38c4 | 1142 | static int build_environment( |
9fa95f85 | 1143 | const ExecContext *c, |
7cae38c4 | 1144 | unsigned n_fds, |
09812eb7 | 1145 | usec_t watchdog_usec, |
7cae38c4 LP |
1146 | const char *home, |
1147 | const char *username, | |
1148 | const char *shell, | |
1149 | char ***ret) { | |
1150 | ||
1151 | _cleanup_strv_free_ char **our_env = NULL; | |
1152 | unsigned n_env = 0; | |
1153 | char *x; | |
1154 | ||
1155 | assert(c); | |
1156 | assert(ret); | |
1157 | ||
09812eb7 | 1158 | our_env = new0(char*, 10); |
7cae38c4 LP |
1159 | if (!our_env) |
1160 | return -ENOMEM; | |
1161 | ||
1162 | if (n_fds > 0) { | |
ccd06097 | 1163 | if (asprintf(&x, "LISTEN_PID="PID_FMT, getpid()) < 0) |
7cae38c4 LP |
1164 | return -ENOMEM; |
1165 | our_env[n_env++] = x; | |
1166 | ||
1167 | if (asprintf(&x, "LISTEN_FDS=%u", n_fds) < 0) | |
1168 | return -ENOMEM; | |
1169 | our_env[n_env++] = x; | |
1170 | } | |
1171 | ||
09812eb7 | 1172 | if (watchdog_usec > 0) { |
ccd06097 | 1173 | if (asprintf(&x, "WATCHDOG_PID="PID_FMT, getpid()) < 0) |
09812eb7 LP |
1174 | return -ENOMEM; |
1175 | our_env[n_env++] = x; | |
1176 | ||
de0671ee | 1177 | if (asprintf(&x, "WATCHDOG_USEC="USEC_FMT, watchdog_usec) < 0) |
09812eb7 LP |
1178 | return -ENOMEM; |
1179 | our_env[n_env++] = x; | |
1180 | } | |
1181 | ||
7cae38c4 LP |
1182 | if (home) { |
1183 | x = strappend("HOME=", home); | |
1184 | if (!x) | |
1185 | return -ENOMEM; | |
1186 | our_env[n_env++] = x; | |
1187 | } | |
1188 | ||
1189 | if (username) { | |
1190 | x = strappend("LOGNAME=", username); | |
1191 | if (!x) | |
1192 | return -ENOMEM; | |
1193 | our_env[n_env++] = x; | |
1194 | ||
1195 | x = strappend("USER=", username); | |
1196 | if (!x) | |
1197 | return -ENOMEM; | |
1198 | our_env[n_env++] = x; | |
1199 | } | |
1200 | ||
1201 | if (shell) { | |
1202 | x = strappend("SHELL=", shell); | |
1203 | if (!x) | |
1204 | return -ENOMEM; | |
1205 | our_env[n_env++] = x; | |
1206 | } | |
1207 | ||
1208 | if (is_terminal_input(c->std_input) || | |
1209 | c->std_output == EXEC_OUTPUT_TTY || | |
1210 | c->std_error == EXEC_OUTPUT_TTY || | |
1211 | c->tty_path) { | |
1212 | ||
1213 | x = strdup(default_term_for_tty(tty_path(c))); | |
1214 | if (!x) | |
1215 | return -ENOMEM; | |
1216 | our_env[n_env++] = x; | |
1217 | } | |
1218 | ||
1219 | our_env[n_env++] = NULL; | |
09812eb7 | 1220 | assert(n_env <= 10); |
7cae38c4 LP |
1221 | |
1222 | *ret = our_env; | |
1223 | our_env = NULL; | |
1224 | ||
1225 | return 0; | |
1226 | } | |
1227 | ||
d35fbf6b DM |
1228 | static int exec_child(ExecCommand *command, |
1229 | const ExecContext *context, | |
1230 | const ExecParameters *params, | |
1231 | ExecRuntime *runtime, | |
1232 | char **argv, | |
1233 | int socket_fd, | |
1234 | int *fds, unsigned n_fds, | |
1235 | char **files_env, | |
1236 | int *error) { | |
1237 | ||
1238 | _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL; | |
1239 | const char *username = NULL, *home = NULL, *shell = NULL; | |
1240 | unsigned n_dont_close = 0; | |
e44da745 | 1241 | int dont_close[n_fds + 4]; |
d35fbf6b DM |
1242 | uid_t uid = (uid_t) -1; |
1243 | gid_t gid = (gid_t) -1; | |
1244 | int i, err; | |
034c6ed7 | 1245 | |
5cb5a6ff LP |
1246 | assert(command); |
1247 | assert(context); | |
d35fbf6b DM |
1248 | assert(params); |
1249 | assert(error); | |
1250 | ||
1251 | rename_process_from_path(command->path); | |
1252 | ||
1253 | /* We reset exactly these signals, since they are the | |
1254 | * only ones we set to SIG_IGN in the main daemon. All | |
1255 | * others we leave untouched because we set them to | |
1256 | * SIG_DFL or a valid handler initially, both of which | |
1257 | * will be demoted to SIG_DFL. */ | |
1258 | default_signals(SIGNALS_CRASH_HANDLER, | |
1259 | SIGNALS_IGNORE, -1); | |
1260 | ||
1261 | if (context->ignore_sigpipe) | |
1262 | ignore_signals(SIGPIPE, -1); | |
1263 | ||
1264 | err = reset_signal_mask(); | |
1265 | if (err < 0) { | |
1266 | *error = EXIT_SIGNAL_MASK; | |
1267 | return err; | |
1268 | } | |
034c6ed7 | 1269 | |
d35fbf6b DM |
1270 | if (params->idle_pipe) |
1271 | do_idle_pipe_dance(params->idle_pipe); | |
4f2d528d | 1272 | |
d35fbf6b DM |
1273 | /* Close sockets very early to make sure we don't |
1274 | * block init reexecution because it cannot bind its | |
1275 | * sockets */ | |
1276 | log_forget_fds(); | |
4f2d528d | 1277 | |
d35fbf6b DM |
1278 | if (socket_fd >= 0) |
1279 | dont_close[n_dont_close++] = socket_fd; | |
1280 | if (n_fds > 0) { | |
1281 | memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds); | |
1282 | n_dont_close += n_fds; | |
1283 | } | |
e44da745 DM |
1284 | if (params->bus_endpoint_fd >= 0) |
1285 | dont_close[n_dont_close++] = params->bus_endpoint_fd; | |
d35fbf6b DM |
1286 | if (runtime) { |
1287 | if (runtime->netns_storage_socket[0] >= 0) | |
1288 | dont_close[n_dont_close++] = runtime->netns_storage_socket[0]; | |
1289 | if (runtime->netns_storage_socket[1] >= 0) | |
1290 | dont_close[n_dont_close++] = runtime->netns_storage_socket[1]; | |
9fa95f85 | 1291 | } |
4f2d528d | 1292 | |
d35fbf6b DM |
1293 | err = close_all_fds(dont_close, n_dont_close); |
1294 | if (err < 0) { | |
1295 | *error = EXIT_FDS; | |
1296 | return err; | |
8c7be95e LP |
1297 | } |
1298 | ||
d35fbf6b DM |
1299 | if (!context->same_pgrp) |
1300 | if (setsid() < 0) { | |
1301 | *error = EXIT_SETSID; | |
1302 | return -errno; | |
1303 | } | |
9e2f7c11 | 1304 | |
d35fbf6b DM |
1305 | exec_context_tty_reset(context); |
1306 | ||
1307 | if (params->confirm_spawn) { | |
1308 | char response; | |
1309 | ||
1310 | err = ask_for_confirmation(&response, argv); | |
1311 | if (err == -ETIMEDOUT) | |
1312 | write_confirm_message("Confirmation question timed out, assuming positive response.\n"); | |
1313 | else if (err < 0) | |
1314 | write_confirm_message("Couldn't ask confirmation question, assuming positive response: %s\n", strerror(-err)); | |
1315 | else if (response == 's') { | |
1316 | write_confirm_message("Skipping execution.\n"); | |
1317 | *error = EXIT_CONFIRM; | |
1318 | return -ECANCELED; | |
1319 | } else if (response == 'n') { | |
1320 | write_confirm_message("Failing execution.\n"); | |
1321 | *error = 0; | |
1322 | return 0; | |
1323 | } | |
1324 | } | |
1a63a750 | 1325 | |
d35fbf6b DM |
1326 | /* If a socket is connected to STDIN/STDOUT/STDERR, we |
1327 | * must sure to drop O_NONBLOCK */ | |
1328 | if (socket_fd >= 0) | |
1329 | fd_nonblock(socket_fd, false); | |
acbb0225 | 1330 | |
d35fbf6b DM |
1331 | err = setup_input(context, socket_fd, params->apply_tty_stdin); |
1332 | if (err < 0) { | |
1333 | *error = EXIT_STDIN; | |
1334 | return err; | |
1335 | } | |
034c6ed7 | 1336 | |
d35fbf6b DM |
1337 | err = setup_output(context, STDOUT_FILENO, socket_fd, basename(command->path), params->unit_id, params->apply_tty_stdin); |
1338 | if (err < 0) { | |
1339 | *error = EXIT_STDOUT; | |
1340 | return err; | |
1341 | } | |
1342 | ||
1343 | err = setup_output(context, STDERR_FILENO, socket_fd, basename(command->path), params->unit_id, params->apply_tty_stdin); | |
1344 | if (err < 0) { | |
1345 | *error = EXIT_STDERR; | |
1346 | return err; | |
1347 | } | |
1348 | ||
1349 | if (params->cgroup_path) { | |
1350 | err = cg_attach_everywhere(params->cgroup_supported, params->cgroup_path, 0); | |
1b6d7fa7 | 1351 | if (err < 0) { |
d35fbf6b DM |
1352 | *error = EXIT_CGROUP; |
1353 | return err; | |
309bff19 | 1354 | } |
d35fbf6b | 1355 | } |
309bff19 | 1356 | |
d35fbf6b DM |
1357 | if (context->oom_score_adjust_set) { |
1358 | char t[16]; | |
f2b68789 | 1359 | |
d35fbf6b DM |
1360 | snprintf(t, sizeof(t), "%i", context->oom_score_adjust); |
1361 | char_array_0(t); | |
613b411c | 1362 | |
d35fbf6b DM |
1363 | if (write_string_file("/proc/self/oom_score_adj", t) < 0) { |
1364 | *error = EXIT_OOM_ADJUST; | |
1365 | return -errno; | |
613b411c | 1366 | } |
d35fbf6b DM |
1367 | } |
1368 | ||
1369 | if (context->nice_set) | |
1370 | if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) { | |
1371 | *error = EXIT_NICE; | |
1372 | return -errno; | |
613b411c LP |
1373 | } |
1374 | ||
d35fbf6b DM |
1375 | if (context->cpu_sched_set) { |
1376 | struct sched_param param = { | |
1377 | .sched_priority = context->cpu_sched_priority, | |
1378 | }; | |
1379 | ||
1380 | err = sched_setscheduler(0, | |
1381 | context->cpu_sched_policy | | |
1382 | (context->cpu_sched_reset_on_fork ? | |
1383 | SCHED_RESET_ON_FORK : 0), | |
1384 | ¶m); | |
4c2630eb | 1385 | if (err < 0) { |
d35fbf6b DM |
1386 | *error = EXIT_SETSCHEDULER; |
1387 | return -errno; | |
fc9b2a84 | 1388 | } |
d35fbf6b | 1389 | } |
fc9b2a84 | 1390 | |
d35fbf6b DM |
1391 | if (context->cpuset) |
1392 | if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) { | |
1393 | *error = EXIT_CPUAFFINITY; | |
1394 | return -errno; | |
034c6ed7 LP |
1395 | } |
1396 | ||
d35fbf6b DM |
1397 | if (context->ioprio_set) |
1398 | if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) { | |
1399 | *error = EXIT_IOPRIO; | |
1400 | return -errno; | |
1401 | } | |
da726a4d | 1402 | |
d35fbf6b DM |
1403 | if (context->timer_slack_nsec != NSEC_INFINITY) |
1404 | if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) { | |
1405 | *error = EXIT_TIMERSLACK; | |
1406 | return -errno; | |
4c2630eb | 1407 | } |
9eba9da4 | 1408 | |
d35fbf6b DM |
1409 | if (context->personality != 0xffffffffUL) |
1410 | if (personality(context->personality) < 0) { | |
1411 | *error = EXIT_PERSONALITY; | |
1412 | return -errno; | |
4c2630eb | 1413 | } |
94f04347 | 1414 | |
d35fbf6b DM |
1415 | if (context->utmp_id) |
1416 | utmp_put_init_process(context->utmp_id, getpid(), getsid(0), context->tty_path); | |
1417 | ||
1418 | if (context->user) { | |
1419 | username = context->user; | |
1420 | err = get_user_creds(&username, &uid, &gid, &home, &shell); | |
4c2630eb | 1421 | if (err < 0) { |
d35fbf6b DM |
1422 | *error = EXIT_USER; |
1423 | return err; | |
071830ff LP |
1424 | } |
1425 | ||
d35fbf6b DM |
1426 | if (is_terminal_input(context->std_input)) { |
1427 | err = chown_terminal(STDIN_FILENO, uid); | |
4c2630eb | 1428 | if (err < 0) { |
d35fbf6b DM |
1429 | *error = EXIT_STDIN; |
1430 | return err; | |
8e274523 | 1431 | } |
4c2630eb | 1432 | } |
d35fbf6b | 1433 | } |
8e274523 | 1434 | |
e44da745 DM |
1435 | #ifdef ENABLE_KDBUS |
1436 | if (params->bus_endpoint_fd >= 0 && context->bus_endpoint) { | |
1437 | uid_t ep_uid = (uid == (uid_t) -1) ? 0 : uid; | |
1438 | ||
1439 | err = bus_kernel_set_endpoint_policy(params->bus_endpoint_fd, ep_uid, context->bus_endpoint); | |
1440 | if (err < 0) { | |
1441 | *error = EXIT_BUS_ENDPOINT; | |
1442 | return err; | |
1443 | } | |
1444 | } | |
1445 | #endif | |
1446 | ||
a931ad47 LP |
1447 | /* If delegation is enabled we'll pass ownership of the cgroup |
1448 | * (but only in systemd's own controller hierarchy!) to the | |
1449 | * user of the new process. */ | |
1450 | if (params->cgroup_path && context->user && params->cgroup_delegate) { | |
d35fbf6b DM |
1451 | err = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0644, uid, gid); |
1452 | if (err < 0) { | |
1453 | *error = EXIT_CGROUP; | |
1454 | return err; | |
1455 | } | |
034c6ed7 | 1456 | |
034c6ed7 | 1457 | |
d35fbf6b DM |
1458 | err = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, 0755, uid, gid); |
1459 | if (err < 0) { | |
1460 | *error = EXIT_CGROUP; | |
1461 | return err; | |
034c6ed7 | 1462 | } |
d35fbf6b | 1463 | } |
034c6ed7 | 1464 | |
d35fbf6b DM |
1465 | if (!strv_isempty(context->runtime_directory) && params->runtime_prefix) { |
1466 | char **rt; | |
fb33a393 | 1467 | |
d35fbf6b DM |
1468 | STRV_FOREACH(rt, context->runtime_directory) { |
1469 | _cleanup_free_ char *p; | |
94f04347 | 1470 | |
d35fbf6b DM |
1471 | p = strjoin(params->runtime_prefix, "/", *rt, NULL); |
1472 | if (!p) { | |
1473 | *error = EXIT_RUNTIME_DIRECTORY; | |
1474 | return -ENOMEM; | |
94f04347 | 1475 | } |
94f04347 | 1476 | |
d35fbf6b DM |
1477 | err = mkdir_safe(p, context->runtime_directory_mode, uid, gid); |
1478 | if (err < 0) { | |
1479 | *error = EXIT_RUNTIME_DIRECTORY; | |
1480 | return err; | |
94f04347 | 1481 | } |
d35fbf6b DM |
1482 | } |
1483 | } | |
94f04347 | 1484 | |
d35fbf6b DM |
1485 | if (params->apply_permissions) { |
1486 | err = enforce_groups(context, username, gid); | |
1487 | if (err < 0) { | |
1488 | *error = EXIT_GROUP; | |
1489 | return err; | |
1490 | } | |
1491 | } | |
9eba9da4 | 1492 | |
d35fbf6b | 1493 | umask(context->umask); |
94f04347 | 1494 | |
d35fbf6b DM |
1495 | #ifdef HAVE_PAM |
1496 | if (params->apply_permissions && context->pam_name && username) { | |
1497 | err = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds); | |
1498 | if (err < 0) { | |
1499 | *error = EXIT_PAM; | |
1500 | return err; | |
1501 | } | |
1502 | } | |
1503 | #endif | |
ac45f971 | 1504 | |
d35fbf6b DM |
1505 | if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) { |
1506 | err = setup_netns(runtime->netns_storage_socket); | |
1507 | if (err < 0) { | |
1508 | *error = EXIT_NETWORK; | |
1509 | return err; | |
1510 | } | |
1511 | } | |
169c1bda | 1512 | |
d35fbf6b DM |
1513 | if (!strv_isempty(context->read_write_dirs) || |
1514 | !strv_isempty(context->read_only_dirs) || | |
1515 | !strv_isempty(context->inaccessible_dirs) || | |
1516 | context->mount_flags != 0 || | |
1517 | (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir)) || | |
e44da745 | 1518 | params->bus_endpoint_path || |
d35fbf6b DM |
1519 | context->private_devices || |
1520 | context->protect_system != PROTECT_SYSTEM_NO || | |
1521 | context->protect_home != PROTECT_HOME_NO) { | |
1522 | ||
1523 | char *tmp = NULL, *var = NULL; | |
1524 | ||
1525 | /* The runtime struct only contains the parent | |
1526 | * of the private /tmp, which is | |
1527 | * non-accessible to world users. Inside of it | |
1528 | * there's a /tmp that is sticky, and that's | |
1529 | * the one we want to use here. */ | |
1530 | ||
1531 | if (context->private_tmp && runtime) { | |
1532 | if (runtime->tmp_dir) | |
1533 | tmp = strappenda(runtime->tmp_dir, "/tmp"); | |
1534 | if (runtime->var_tmp_dir) | |
1535 | var = strappenda(runtime->var_tmp_dir, "/tmp"); | |
1536 | } | |
d8b4e2e9 | 1537 | |
d35fbf6b DM |
1538 | err = setup_namespace( |
1539 | context->read_write_dirs, | |
1540 | context->read_only_dirs, | |
1541 | context->inaccessible_dirs, | |
1542 | tmp, | |
1543 | var, | |
e44da745 | 1544 | params->bus_endpoint_path, |
d35fbf6b DM |
1545 | context->private_devices, |
1546 | context->protect_home, | |
1547 | context->protect_system, | |
1548 | context->mount_flags); | |
0015ebf3 MS |
1549 | |
1550 | if (err == -EPERM) | |
8fa6cbe1 | 1551 | log_warning_unit(params->unit_id, "Failed to set up file system namespace due to lack of privileges. Execution sandbox will not be in effect: %s", strerror(-err)); |
0015ebf3 | 1552 | else if (err < 0) { |
d35fbf6b DM |
1553 | *error = EXIT_NAMESPACE; |
1554 | return err; | |
81a2b7ce | 1555 | } |
d35fbf6b | 1556 | } |
81a2b7ce | 1557 | |
d35fbf6b DM |
1558 | if (params->apply_chroot) { |
1559 | if (context->root_directory) | |
1560 | if (chroot(context->root_directory) < 0) { | |
1561 | *error = EXIT_CHROOT; | |
1562 | return -errno; | |
8aa75193 LP |
1563 | } |
1564 | ||
d35fbf6b DM |
1565 | if (chdir(context->working_directory ? context->working_directory : "/") < 0) { |
1566 | *error = EXIT_CHDIR; | |
1567 | return -errno; | |
1568 | } | |
1569 | } else { | |
1570 | _cleanup_free_ char *d = NULL; | |
8aa75193 | 1571 | |
d35fbf6b DM |
1572 | if (asprintf(&d, "%s/%s", |
1573 | context->root_directory ? context->root_directory : "", | |
1574 | context->working_directory ? context->working_directory : "") < 0) { | |
1575 | *error = EXIT_MEMORY; | |
1576 | return -ENOMEM; | |
8aa75193 | 1577 | } |
8aa75193 | 1578 | |
d35fbf6b DM |
1579 | if (chdir(d) < 0) { |
1580 | *error = EXIT_CHDIR; | |
1581 | return -errno; | |
1582 | } | |
1583 | } | |
e66cf1a3 | 1584 | |
d35fbf6b DM |
1585 | /* We repeat the fd closing here, to make sure that |
1586 | * nothing is leaked from the PAM modules. Note that | |
1587 | * we are more aggressive this time since socket_fd | |
e44da745 DM |
1588 | * and the netns fds we don't need anymore. The custom |
1589 | * endpoint fd was needed to upload the policy and can | |
1590 | * now be closed as well. */ | |
d35fbf6b DM |
1591 | err = close_all_fds(fds, n_fds); |
1592 | if (err >= 0) | |
1593 | err = shift_fds(fds, n_fds); | |
1594 | if (err >= 0) | |
1595 | err = flags_fds(fds, n_fds, context->non_blocking); | |
1596 | if (err < 0) { | |
1597 | *error = EXIT_FDS; | |
1598 | return err; | |
1599 | } | |
e66cf1a3 | 1600 | |
d35fbf6b | 1601 | if (params->apply_permissions) { |
e66cf1a3 | 1602 | |
d35fbf6b DM |
1603 | for (i = 0; i < _RLIMIT_MAX; i++) { |
1604 | if (!context->rlimit[i]) | |
1605 | continue; | |
1606 | ||
1607 | if (setrlimit_closest(i, context->rlimit[i]) < 0) { | |
1608 | *error = EXIT_LIMITS; | |
1609 | return -errno; | |
e66cf1a3 LP |
1610 | } |
1611 | } | |
1612 | ||
d35fbf6b DM |
1613 | if (context->capability_bounding_set_drop) { |
1614 | err = capability_bounding_set_drop(context->capability_bounding_set_drop, false); | |
4c2630eb | 1615 | if (err < 0) { |
d35fbf6b DM |
1616 | *error = EXIT_CAPABILITIES; |
1617 | return err; | |
3b8bddde | 1618 | } |
4c2630eb | 1619 | } |
3b8bddde | 1620 | |
d35fbf6b DM |
1621 | if (context->user) { |
1622 | err = enforce_user(context, uid); | |
4c2630eb | 1623 | if (err < 0) { |
d35fbf6b DM |
1624 | *error = EXIT_USER; |
1625 | return err; | |
5b6319dc LP |
1626 | } |
1627 | } | |
d35fbf6b DM |
1628 | |
1629 | /* PR_GET_SECUREBITS is not privileged, while | |
1630 | * PR_SET_SECUREBITS is. So to suppress | |
1631 | * potential EPERMs we'll try not to call | |
1632 | * PR_SET_SECUREBITS unless necessary. */ | |
1633 | if (prctl(PR_GET_SECUREBITS) != context->secure_bits) | |
1634 | if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) { | |
1635 | *error = EXIT_SECUREBITS; | |
1636 | return -errno; | |
ff01d048 | 1637 | } |
5b6319dc | 1638 | |
d35fbf6b DM |
1639 | if (context->capabilities) |
1640 | if (cap_set_proc(context->capabilities) < 0) { | |
1641 | *error = EXIT_CAPABILITIES; | |
1642 | return -errno; | |
613b411c LP |
1643 | } |
1644 | ||
d35fbf6b DM |
1645 | if (context->no_new_privileges) |
1646 | if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) { | |
1647 | *error = EXIT_NO_NEW_PRIVILEGES; | |
1648 | return -errno; | |
1649 | } | |
1650 | ||
1651 | #ifdef HAVE_SECCOMP | |
1652 | if (context->address_families_whitelist || | |
1653 | !set_isempty(context->address_families)) { | |
1654 | err = apply_address_families(context); | |
4c2630eb | 1655 | if (err < 0) { |
d35fbf6b DM |
1656 | *error = EXIT_ADDRESS_FAMILIES; |
1657 | return err; | |
4c2630eb MS |
1658 | } |
1659 | } | |
04aa0cb9 | 1660 | |
d35fbf6b DM |
1661 | if (context->syscall_whitelist || |
1662 | !set_isempty(context->syscall_filter) || | |
1663 | !set_isempty(context->syscall_archs)) { | |
1664 | err = apply_seccomp(context); | |
1665 | if (err < 0) { | |
1666 | *error = EXIT_SECCOMP; | |
1667 | return err; | |
81a2b7ce | 1668 | } |
d35fbf6b DM |
1669 | } |
1670 | #endif | |
81a2b7ce | 1671 | |
d35fbf6b | 1672 | #ifdef HAVE_SELINUX |
6baa7db0 | 1673 | if (mac_selinux_use()) { |
16115b0a MS |
1674 | if (context->selinux_context) { |
1675 | err = setexeccon(context->selinux_context); | |
1676 | if (err < 0 && !context->selinux_context_ignore) { | |
1677 | *error = EXIT_SELINUX_CONTEXT; | |
1678 | return err; | |
1679 | } | |
1680 | } | |
1681 | ||
1682 | if (params->selinux_context_net && socket_fd >= 0) { | |
1683 | _cleanup_free_ char *label = NULL; | |
1684 | ||
cc56fafe | 1685 | err = mac_selinux_get_child_mls_label(socket_fd, command->path, &label); |
16115b0a MS |
1686 | if (err < 0) { |
1687 | *error = EXIT_SELINUX_CONTEXT; | |
1688 | return err; | |
1689 | } | |
1690 | ||
1691 | err = setexeccon(label); | |
1692 | if (err < 0) { | |
1693 | *error = EXIT_SELINUX_CONTEXT; | |
1694 | return err; | |
1695 | } | |
81a2b7ce | 1696 | } |
81a2b7ce | 1697 | } |
d35fbf6b | 1698 | #endif |
81a2b7ce | 1699 | |
d35fbf6b | 1700 | #ifdef HAVE_APPARMOR |
6baa7db0 | 1701 | if (context->apparmor_profile && mac_apparmor_use()) { |
d35fbf6b DM |
1702 | err = aa_change_onexec(context->apparmor_profile); |
1703 | if (err < 0 && !context->apparmor_profile_ignore) { | |
1704 | *error = EXIT_APPARMOR_PROFILE; | |
5482192e | 1705 | return -errno; |
d35fbf6b | 1706 | } |
034c6ed7 | 1707 | } |
d35fbf6b DM |
1708 | #endif |
1709 | } | |
034c6ed7 | 1710 | |
d35fbf6b DM |
1711 | err = build_environment(context, n_fds, params->watchdog_usec, home, username, shell, &our_env); |
1712 | if (err < 0) { | |
1713 | *error = EXIT_MEMORY; | |
1714 | return err; | |
1715 | } | |
034c6ed7 | 1716 | |
d35fbf6b DM |
1717 | final_env = strv_env_merge(5, |
1718 | params->environment, | |
1719 | our_env, | |
1720 | context->environment, | |
1721 | files_env, | |
1722 | pam_env, | |
1723 | NULL); | |
1724 | if (!final_env) { | |
1725 | *error = EXIT_MEMORY; | |
1726 | return -ENOMEM; | |
1727 | } | |
81a2b7ce | 1728 | |
d35fbf6b DM |
1729 | final_argv = replace_env_argv(argv, final_env); |
1730 | if (!final_argv) { | |
1731 | *error = EXIT_MEMORY; | |
1732 | return -ENOMEM; | |
1733 | } | |
034c6ed7 | 1734 | |
d35fbf6b | 1735 | final_env = strv_env_clean(final_env); |
260abb78 | 1736 | |
d35fbf6b DM |
1737 | if (_unlikely_(log_get_max_level() >= LOG_PRI(LOG_DEBUG))) { |
1738 | _cleanup_free_ char *line; | |
81a2b7ce | 1739 | |
d35fbf6b DM |
1740 | line = exec_command_line(final_argv); |
1741 | if (line) { | |
1742 | log_open(); | |
1743 | log_struct_unit(LOG_DEBUG, | |
1744 | params->unit_id, | |
1745 | "EXECUTABLE=%s", command->path, | |
1746 | "MESSAGE=Executing: %s", line, | |
1747 | NULL); | |
1748 | log_close(); | |
1749 | } | |
1750 | } | |
1751 | execve(command->path, final_argv, final_env); | |
1752 | *error = EXIT_EXEC; | |
1753 | return -errno; | |
1754 | } | |
81a2b7ce | 1755 | |
d35fbf6b DM |
1756 | int exec_spawn(ExecCommand *command, |
1757 | const ExecContext *context, | |
1758 | const ExecParameters *params, | |
1759 | ExecRuntime *runtime, | |
1760 | pid_t *ret) { | |
8351ceae | 1761 | |
d35fbf6b DM |
1762 | _cleanup_strv_free_ char **files_env = NULL; |
1763 | int *fds = NULL; unsigned n_fds = 0; | |
1764 | char *line, **argv; | |
1765 | int socket_fd; | |
1766 | pid_t pid; | |
1767 | int err; | |
8351ceae | 1768 | |
d35fbf6b DM |
1769 | assert(command); |
1770 | assert(context); | |
1771 | assert(ret); | |
1772 | assert(params); | |
1773 | assert(params->fds || params->n_fds <= 0); | |
4298d0b5 | 1774 | |
d35fbf6b DM |
1775 | if (context->std_input == EXEC_INPUT_SOCKET || |
1776 | context->std_output == EXEC_OUTPUT_SOCKET || | |
1777 | context->std_error == EXEC_OUTPUT_SOCKET) { | |
17df7223 | 1778 | |
d35fbf6b DM |
1779 | if (params->n_fds != 1) |
1780 | return -EINVAL; | |
eef65bf3 | 1781 | |
d35fbf6b DM |
1782 | socket_fd = params->fds[0]; |
1783 | } else { | |
1784 | socket_fd = -1; | |
1785 | fds = params->fds; | |
1786 | n_fds = params->n_fds; | |
1787 | } | |
94f04347 | 1788 | |
7491ccf2 | 1789 | err = exec_context_load_environment(context, params->unit_id, &files_env); |
d35fbf6b DM |
1790 | if (err < 0) { |
1791 | log_struct_unit(LOG_ERR, | |
1792 | params->unit_id, | |
1793 | "MESSAGE=Failed to load environment files: %s", strerror(-err), | |
1794 | "ERRNO=%d", -err, | |
1795 | NULL); | |
1796 | return err; | |
1797 | } | |
034c6ed7 | 1798 | |
d35fbf6b | 1799 | argv = params->argv ?: command->argv; |
034c6ed7 | 1800 | |
d35fbf6b DM |
1801 | line = exec_command_line(argv); |
1802 | if (!line) | |
1803 | return log_oom(); | |
fab56fc5 | 1804 | |
d35fbf6b DM |
1805 | log_struct_unit(LOG_DEBUG, |
1806 | params->unit_id, | |
1807 | "EXECUTABLE=%s", command->path, | |
1808 | "MESSAGE=About to execute: %s", line, | |
1809 | NULL); | |
1810 | free(line); | |
1811 | ||
1812 | pid = fork(); | |
1813 | if (pid < 0) | |
1814 | return -errno; | |
1815 | ||
1816 | if (pid == 0) { | |
1817 | int r; | |
034c6ed7 | 1818 | |
d35fbf6b DM |
1819 | err = exec_child(command, |
1820 | context, | |
1821 | params, | |
1822 | runtime, | |
1823 | argv, | |
1824 | socket_fd, | |
1825 | fds, n_fds, | |
1826 | files_env, | |
1827 | &r); | |
4c2630eb MS |
1828 | if (r != 0) { |
1829 | log_open(); | |
23635a85 ZJS |
1830 | log_struct(LOG_ERR, MESSAGE_ID(SD_MESSAGE_SPAWN_FAILED), |
1831 | "EXECUTABLE=%s", command->path, | |
1832 | "MESSAGE=Failed at step %s spawning %s: %s", | |
1833 | exit_status_to_string(r, EXIT_STATUS_SYSTEMD), | |
1834 | command->path, strerror(-err), | |
1835 | "ERRNO=%d", -err, | |
1836 | NULL); | |
1837 | log_close(); | |
4c2630eb MS |
1838 | } |
1839 | ||
034c6ed7 LP |
1840 | _exit(r); |
1841 | } | |
1842 | ||
bbc9006e | 1843 | log_struct_unit(LOG_DEBUG, |
d35fbf6b | 1844 | params->unit_id, |
ccd06097 ZJS |
1845 | "MESSAGE=Forked %s as "PID_FMT, |
1846 | command->path, pid, | |
e62d8c39 | 1847 | NULL); |
23635a85 | 1848 | |
80876c20 LP |
1849 | /* We add the new process to the cgroup both in the child (so |
1850 | * that we can be sure that no user code is ever executed | |
1851 | * outside of the cgroup) and in the parent (so that we can be | |
1852 | * sure that when we kill the cgroup the process will be | |
1853 | * killed too). */ | |
d35fbf6b DM |
1854 | if (params->cgroup_path) |
1855 | cg_attach(SYSTEMD_CGROUP_CONTROLLER, params->cgroup_path, pid); | |
2da3263a | 1856 | |
b58b4116 | 1857 | exec_status_start(&command->exec_status, pid); |
9fb86720 | 1858 | |
034c6ed7 | 1859 | *ret = pid; |
5cb5a6ff LP |
1860 | return 0; |
1861 | } | |
1862 | ||
034c6ed7 LP |
1863 | void exec_context_init(ExecContext *c) { |
1864 | assert(c); | |
1865 | ||
4c12626c | 1866 | c->umask = 0022; |
9eba9da4 | 1867 | c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0); |
94f04347 | 1868 | c->cpu_sched_policy = SCHED_OTHER; |
071830ff | 1869 | c->syslog_priority = LOG_DAEMON|LOG_INFO; |
74922904 | 1870 | c->syslog_level_prefix = true; |
353e12c2 | 1871 | c->ignore_sigpipe = true; |
3a43da28 | 1872 | c->timer_slack_nsec = NSEC_INFINITY; |
ac45f971 | 1873 | c->personality = 0xffffffffUL; |
e66cf1a3 | 1874 | c->runtime_directory_mode = 0755; |
034c6ed7 LP |
1875 | } |
1876 | ||
613b411c | 1877 | void exec_context_done(ExecContext *c) { |
5cb5a6ff LP |
1878 | unsigned l; |
1879 | ||
1880 | assert(c); | |
1881 | ||
1882 | strv_free(c->environment); | |
034c6ed7 | 1883 | c->environment = NULL; |
5cb5a6ff | 1884 | |
8c7be95e LP |
1885 | strv_free(c->environment_files); |
1886 | c->environment_files = NULL; | |
1887 | ||
034c6ed7 | 1888 | for (l = 0; l < ELEMENTSOF(c->rlimit); l++) { |
5cb5a6ff | 1889 | free(c->rlimit[l]); |
034c6ed7 LP |
1890 | c->rlimit[l] = NULL; |
1891 | } | |
1892 | ||
9eba9da4 LP |
1893 | free(c->working_directory); |
1894 | c->working_directory = NULL; | |
1895 | free(c->root_directory); | |
1896 | c->root_directory = NULL; | |
5cb5a6ff | 1897 | |
80876c20 LP |
1898 | free(c->tty_path); |
1899 | c->tty_path = NULL; | |
1900 | ||
071830ff LP |
1901 | free(c->syslog_identifier); |
1902 | c->syslog_identifier = NULL; | |
1903 | ||
5cb5a6ff | 1904 | free(c->user); |
034c6ed7 LP |
1905 | c->user = NULL; |
1906 | ||
5cb5a6ff | 1907 | free(c->group); |
034c6ed7 LP |
1908 | c->group = NULL; |
1909 | ||
1910 | strv_free(c->supplementary_groups); | |
1911 | c->supplementary_groups = NULL; | |
94f04347 | 1912 | |
5b6319dc LP |
1913 | free(c->pam_name); |
1914 | c->pam_name = NULL; | |
1915 | ||
94f04347 LP |
1916 | if (c->capabilities) { |
1917 | cap_free(c->capabilities); | |
1918 | c->capabilities = NULL; | |
1919 | } | |
15ae422b LP |
1920 | |
1921 | strv_free(c->read_only_dirs); | |
1922 | c->read_only_dirs = NULL; | |
1923 | ||
1924 | strv_free(c->read_write_dirs); | |
1925 | c->read_write_dirs = NULL; | |
1926 | ||
1927 | strv_free(c->inaccessible_dirs); | |
1928 | c->inaccessible_dirs = NULL; | |
82c121a4 LP |
1929 | |
1930 | if (c->cpuset) | |
1931 | CPU_FREE(c->cpuset); | |
86a3475b LP |
1932 | |
1933 | free(c->utmp_id); | |
1934 | c->utmp_id = NULL; | |
b9a0e010 | 1935 | |
7b52a628 MS |
1936 | free(c->selinux_context); |
1937 | c->selinux_context = NULL; | |
1938 | ||
eef65bf3 MS |
1939 | free(c->apparmor_profile); |
1940 | c->apparmor_profile = NULL; | |
1941 | ||
17df7223 LP |
1942 | set_free(c->syscall_filter); |
1943 | c->syscall_filter = NULL; | |
57183d11 LP |
1944 | |
1945 | set_free(c->syscall_archs); | |
1946 | c->syscall_archs = NULL; | |
4298d0b5 LP |
1947 | |
1948 | set_free(c->address_families); | |
1949 | c->address_families = NULL; | |
e66cf1a3 LP |
1950 | |
1951 | strv_free(c->runtime_directory); | |
1952 | c->runtime_directory = NULL; | |
bb7dd0b0 DM |
1953 | |
1954 | bus_endpoint_free(c->bus_endpoint); | |
1955 | c->bus_endpoint = NULL; | |
e66cf1a3 LP |
1956 | } |
1957 | ||
1958 | int exec_context_destroy_runtime_directory(ExecContext *c, const char *runtime_prefix) { | |
1959 | char **i; | |
1960 | ||
1961 | assert(c); | |
1962 | ||
1963 | if (!runtime_prefix) | |
1964 | return 0; | |
1965 | ||
1966 | STRV_FOREACH(i, c->runtime_directory) { | |
1967 | _cleanup_free_ char *p; | |
1968 | ||
1969 | p = strjoin(runtime_prefix, "/", *i, NULL); | |
1970 | if (!p) | |
1971 | return -ENOMEM; | |
1972 | ||
1973 | /* We execute this synchronously, since we need to be | |
1974 | * sure this is gone when we start the service | |
1975 | * next. */ | |
1976 | rm_rf_dangerous(p, false, true, false); | |
1977 | } | |
1978 | ||
1979 | return 0; | |
5cb5a6ff LP |
1980 | } |
1981 | ||
43d0fcbd LP |
1982 | void exec_command_done(ExecCommand *c) { |
1983 | assert(c); | |
1984 | ||
1985 | free(c->path); | |
1986 | c->path = NULL; | |
1987 | ||
1988 | strv_free(c->argv); | |
1989 | c->argv = NULL; | |
1990 | } | |
1991 | ||
1992 | void exec_command_done_array(ExecCommand *c, unsigned n) { | |
1993 | unsigned i; | |
1994 | ||
1995 | for (i = 0; i < n; i++) | |
1996 | exec_command_done(c+i); | |
1997 | } | |
1998 | ||
5cb5a6ff LP |
1999 | void exec_command_free_list(ExecCommand *c) { |
2000 | ExecCommand *i; | |
2001 | ||
2002 | while ((i = c)) { | |
71fda00f | 2003 | LIST_REMOVE(command, c, i); |
43d0fcbd | 2004 | exec_command_done(i); |
5cb5a6ff LP |
2005 | free(i); |
2006 | } | |
2007 | } | |
2008 | ||
034c6ed7 LP |
2009 | void exec_command_free_array(ExecCommand **c, unsigned n) { |
2010 | unsigned i; | |
2011 | ||
2012 | for (i = 0; i < n; i++) { | |
2013 | exec_command_free_list(c[i]); | |
2014 | c[i] = NULL; | |
2015 | } | |
2016 | } | |
2017 | ||
7491ccf2 | 2018 | int exec_context_load_environment(const ExecContext *c, const char *unit_id, char ***l) { |
8c7be95e LP |
2019 | char **i, **r = NULL; |
2020 | ||
2021 | assert(c); | |
2022 | assert(l); | |
2023 | ||
2024 | STRV_FOREACH(i, c->environment_files) { | |
2025 | char *fn; | |
2026 | int k; | |
2027 | bool ignore = false; | |
2028 | char **p; | |
7fd1b19b | 2029 | _cleanup_globfree_ glob_t pglob = {}; |
2bef10ab | 2030 | int count, n; |
8c7be95e LP |
2031 | |
2032 | fn = *i; | |
2033 | ||
2034 | if (fn[0] == '-') { | |
2035 | ignore = true; | |
2036 | fn ++; | |
2037 | } | |
2038 | ||
2039 | if (!path_is_absolute(fn)) { | |
8c7be95e LP |
2040 | if (ignore) |
2041 | continue; | |
2042 | ||
2043 | strv_free(r); | |
2044 | return -EINVAL; | |
2045 | } | |
2046 | ||
2bef10ab | 2047 | /* Filename supports globbing, take all matching files */ |
2bef10ab PL |
2048 | errno = 0; |
2049 | if (glob(fn, 0, NULL, &pglob) != 0) { | |
2bef10ab PL |
2050 | if (ignore) |
2051 | continue; | |
8c7be95e | 2052 | |
2bef10ab PL |
2053 | strv_free(r); |
2054 | return errno ? -errno : -EINVAL; | |
2055 | } | |
2056 | count = pglob.gl_pathc; | |
2057 | if (count == 0) { | |
8c7be95e LP |
2058 | if (ignore) |
2059 | continue; | |
2060 | ||
2061 | strv_free(r); | |
2bef10ab | 2062 | return -EINVAL; |
8c7be95e | 2063 | } |
2bef10ab | 2064 | for (n = 0; n < count; n++) { |
717603e3 | 2065 | k = load_env_file(NULL, pglob.gl_pathv[n], NULL, &p); |
2bef10ab PL |
2066 | if (k < 0) { |
2067 | if (ignore) | |
2068 | continue; | |
8c7be95e | 2069 | |
2bef10ab | 2070 | strv_free(r); |
2bef10ab | 2071 | return k; |
e9c1ea9d | 2072 | } |
ebc05a09 | 2073 | /* Log invalid environment variables with filename */ |
e9c1ea9d | 2074 | if (p) |
7491ccf2 | 2075 | p = strv_env_clean_log(p, unit_id, pglob.gl_pathv[n]); |
8c7be95e | 2076 | |
2bef10ab PL |
2077 | if (r == NULL) |
2078 | r = p; | |
2079 | else { | |
2080 | char **m; | |
8c7be95e | 2081 | |
2bef10ab PL |
2082 | m = strv_env_merge(2, r, p); |
2083 | strv_free(r); | |
2084 | strv_free(p); | |
c84a9488 | 2085 | if (!m) |
2bef10ab | 2086 | return -ENOMEM; |
2bef10ab PL |
2087 | |
2088 | r = m; | |
2089 | } | |
8c7be95e LP |
2090 | } |
2091 | } | |
2092 | ||
2093 | *l = r; | |
2094 | ||
2095 | return 0; | |
2096 | } | |
2097 | ||
6ac8fdc9 | 2098 | static bool tty_may_match_dev_console(const char *tty) { |
e1d75803 RC |
2099 | _cleanup_free_ char *active = NULL; |
2100 | char *console; | |
6ac8fdc9 MS |
2101 | |
2102 | if (startswith(tty, "/dev/")) | |
2103 | tty += 5; | |
2104 | ||
2105 | /* trivial identity? */ | |
2106 | if (streq(tty, "console")) | |
2107 | return true; | |
2108 | ||
2109 | console = resolve_dev_console(&active); | |
2110 | /* if we could not resolve, assume it may */ | |
2111 | if (!console) | |
2112 | return true; | |
2113 | ||
2114 | /* "tty0" means the active VC, so it may be the same sometimes */ | |
e1d75803 | 2115 | return streq(console, tty) || (streq(console, "tty0") && tty_is_vc(tty)); |
6ac8fdc9 MS |
2116 | } |
2117 | ||
2118 | bool exec_context_may_touch_console(ExecContext *ec) { | |
2119 | return (ec->tty_reset || ec->tty_vhangup || ec->tty_vt_disallocate || | |
2120 | is_terminal_input(ec->std_input) || | |
2121 | is_terminal_output(ec->std_output) || | |
2122 | is_terminal_output(ec->std_error)) && | |
2123 | tty_may_match_dev_console(tty_path(ec)); | |
2124 | } | |
2125 | ||
15ae422b LP |
2126 | static void strv_fprintf(FILE *f, char **l) { |
2127 | char **g; | |
2128 | ||
2129 | assert(f); | |
2130 | ||
2131 | STRV_FOREACH(g, l) | |
2132 | fprintf(f, " %s", *g); | |
2133 | } | |
2134 | ||
5cb5a6ff | 2135 | void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { |
507f22bd | 2136 | char **e; |
94f04347 | 2137 | unsigned i; |
9eba9da4 | 2138 | |
5cb5a6ff LP |
2139 | assert(c); |
2140 | assert(f); | |
2141 | ||
4ad49000 | 2142 | prefix = strempty(prefix); |
5cb5a6ff LP |
2143 | |
2144 | fprintf(f, | |
94f04347 LP |
2145 | "%sUMask: %04o\n" |
2146 | "%sWorkingDirectory: %s\n" | |
451a074f | 2147 | "%sRootDirectory: %s\n" |
15ae422b | 2148 | "%sNonBlocking: %s\n" |
64747e2d | 2149 | "%sPrivateTmp: %s\n" |
4819ff03 | 2150 | "%sPrivateNetwork: %s\n" |
7f112f50 | 2151 | "%sPrivateDevices: %s\n" |
1b8689f9 LP |
2152 | "%sProtectHome: %s\n" |
2153 | "%sProtectSystem: %s\n" | |
3bb07b76 | 2154 | "%sIgnoreSIGPIPE: %s\n", |
5cb5a6ff | 2155 | prefix, c->umask, |
9eba9da4 | 2156 | prefix, c->working_directory ? c->working_directory : "/", |
451a074f | 2157 | prefix, c->root_directory ? c->root_directory : "/", |
15ae422b | 2158 | prefix, yes_no(c->non_blocking), |
64747e2d | 2159 | prefix, yes_no(c->private_tmp), |
4819ff03 | 2160 | prefix, yes_no(c->private_network), |
7f112f50 | 2161 | prefix, yes_no(c->private_devices), |
1b8689f9 LP |
2162 | prefix, protect_home_to_string(c->protect_home), |
2163 | prefix, protect_system_to_string(c->protect_system), | |
3bb07b76 | 2164 | prefix, yes_no(c->ignore_sigpipe)); |
fb33a393 | 2165 | |
8c7be95e LP |
2166 | STRV_FOREACH(e, c->environment) |
2167 | fprintf(f, "%sEnvironment: %s\n", prefix, *e); | |
2168 | ||
2169 | STRV_FOREACH(e, c->environment_files) | |
2170 | fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e); | |
94f04347 | 2171 | |
fb33a393 LP |
2172 | if (c->nice_set) |
2173 | fprintf(f, | |
2174 | "%sNice: %i\n", | |
2175 | prefix, c->nice); | |
2176 | ||
dd6c17b1 | 2177 | if (c->oom_score_adjust_set) |
fb33a393 | 2178 | fprintf(f, |
dd6c17b1 LP |
2179 | "%sOOMScoreAdjust: %i\n", |
2180 | prefix, c->oom_score_adjust); | |
9eba9da4 | 2181 | |
94f04347 LP |
2182 | for (i = 0; i < RLIM_NLIMITS; i++) |
2183 | if (c->rlimit[i]) | |
de0671ee ZJS |
2184 | fprintf(f, "%s%s: "RLIM_FMT"\n", |
2185 | prefix, rlimit_to_string(i), c->rlimit[i]->rlim_max); | |
94f04347 | 2186 | |
f8b69d1d | 2187 | if (c->ioprio_set) { |
1756a011 | 2188 | _cleanup_free_ char *class_str = NULL; |
f8b69d1d | 2189 | |
1756a011 | 2190 | ioprio_class_to_string_alloc(IOPRIO_PRIO_CLASS(c->ioprio), &class_str); |
9eba9da4 LP |
2191 | fprintf(f, |
2192 | "%sIOSchedulingClass: %s\n" | |
2193 | "%sIOPriority: %i\n", | |
f8b69d1d | 2194 | prefix, strna(class_str), |
9eba9da4 | 2195 | prefix, (int) IOPRIO_PRIO_DATA(c->ioprio)); |
f8b69d1d | 2196 | } |
94f04347 | 2197 | |
f8b69d1d | 2198 | if (c->cpu_sched_set) { |
1756a011 | 2199 | _cleanup_free_ char *policy_str = NULL; |
f8b69d1d | 2200 | |
1756a011 | 2201 | sched_policy_to_string_alloc(c->cpu_sched_policy, &policy_str); |
94f04347 LP |
2202 | fprintf(f, |
2203 | "%sCPUSchedulingPolicy: %s\n" | |
38b48754 LP |
2204 | "%sCPUSchedulingPriority: %i\n" |
2205 | "%sCPUSchedulingResetOnFork: %s\n", | |
f8b69d1d | 2206 | prefix, strna(policy_str), |
38b48754 LP |
2207 | prefix, c->cpu_sched_priority, |
2208 | prefix, yes_no(c->cpu_sched_reset_on_fork)); | |
b929bf04 | 2209 | } |
94f04347 | 2210 | |
82c121a4 | 2211 | if (c->cpuset) { |
94f04347 | 2212 | fprintf(f, "%sCPUAffinity:", prefix); |
82c121a4 LP |
2213 | for (i = 0; i < c->cpuset_ncpus; i++) |
2214 | if (CPU_ISSET_S(i, CPU_ALLOC_SIZE(c->cpuset_ncpus), c->cpuset)) | |
43a99a7a | 2215 | fprintf(f, " %u", i); |
94f04347 LP |
2216 | fputs("\n", f); |
2217 | } | |
2218 | ||
3a43da28 | 2219 | if (c->timer_slack_nsec != NSEC_INFINITY) |
ccd06097 | 2220 | fprintf(f, "%sTimerSlackNSec: "NSEC_FMT "\n", prefix, c->timer_slack_nsec); |
94f04347 LP |
2221 | |
2222 | fprintf(f, | |
80876c20 LP |
2223 | "%sStandardInput: %s\n" |
2224 | "%sStandardOutput: %s\n" | |
2225 | "%sStandardError: %s\n", | |
2226 | prefix, exec_input_to_string(c->std_input), | |
2227 | prefix, exec_output_to_string(c->std_output), | |
2228 | prefix, exec_output_to_string(c->std_error)); | |
2229 | ||
2230 | if (c->tty_path) | |
2231 | fprintf(f, | |
6ea832a2 LP |
2232 | "%sTTYPath: %s\n" |
2233 | "%sTTYReset: %s\n" | |
2234 | "%sTTYVHangup: %s\n" | |
2235 | "%sTTYVTDisallocate: %s\n", | |
2236 | prefix, c->tty_path, | |
2237 | prefix, yes_no(c->tty_reset), | |
2238 | prefix, yes_no(c->tty_vhangup), | |
2239 | prefix, yes_no(c->tty_vt_disallocate)); | |
94f04347 | 2240 | |
5ce70e5b ZJS |
2241 | if (c->std_output == EXEC_OUTPUT_SYSLOG || |
2242 | c->std_output == EXEC_OUTPUT_KMSG || | |
2243 | c->std_output == EXEC_OUTPUT_JOURNAL || | |
2244 | c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
2245 | c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
2246 | c->std_output == EXEC_OUTPUT_JOURNAL_AND_CONSOLE || | |
2247 | c->std_error == EXEC_OUTPUT_SYSLOG || | |
2248 | c->std_error == EXEC_OUTPUT_KMSG || | |
2249 | c->std_error == EXEC_OUTPUT_JOURNAL || | |
2250 | c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || | |
2251 | c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE || | |
2252 | c->std_error == EXEC_OUTPUT_JOURNAL_AND_CONSOLE) { | |
f8b69d1d | 2253 | |
5ce70e5b | 2254 | _cleanup_free_ char *fac_str = NULL, *lvl_str = NULL; |
f8b69d1d | 2255 | |
5ce70e5b ZJS |
2256 | log_facility_unshifted_to_string_alloc(c->syslog_priority >> 3, &fac_str); |
2257 | log_level_to_string_alloc(LOG_PRI(c->syslog_priority), &lvl_str); | |
f8b69d1d | 2258 | |
94f04347 LP |
2259 | fprintf(f, |
2260 | "%sSyslogFacility: %s\n" | |
2261 | "%sSyslogLevel: %s\n", | |
f8b69d1d MS |
2262 | prefix, strna(fac_str), |
2263 | prefix, strna(lvl_str)); | |
f8b69d1d | 2264 | } |
94f04347 LP |
2265 | |
2266 | if (c->capabilities) { | |
5ce70e5b ZJS |
2267 | _cleanup_cap_free_charp_ char *t; |
2268 | ||
2269 | t = cap_to_text(c->capabilities, NULL); | |
2270 | if (t) | |
2271 | fprintf(f, "%sCapabilities: %s\n", prefix, t); | |
94f04347 LP |
2272 | } |
2273 | ||
2274 | if (c->secure_bits) | |
2275 | fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n", | |
2276 | prefix, | |
cbb21cca ZJS |
2277 | (c->secure_bits & 1<<SECURE_KEEP_CAPS) ? " keep-caps" : "", |
2278 | (c->secure_bits & 1<<SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "", | |
2279 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "", | |
2280 | (c->secure_bits & 1<<SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "", | |
2281 | (c->secure_bits & 1<<SECURE_NOROOT) ? " noroot" : "", | |
2282 | (c->secure_bits & 1<<SECURE_NOROOT_LOCKED) ? "noroot-locked" : ""); | |
94f04347 LP |
2283 | |
2284 | if (c->capability_bounding_set_drop) { | |
ae556c21 | 2285 | unsigned long l; |
260abb78 | 2286 | fprintf(f, "%sCapabilityBoundingSet:", prefix); |
94f04347 | 2287 | |
64685e0c | 2288 | for (l = 0; l <= cap_last_cap(); l++) |
ae556c21 | 2289 | if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) { |
5ce70e5b | 2290 | _cleanup_cap_free_charp_ char *t; |
94f04347 | 2291 | |
5ce70e5b ZJS |
2292 | t = cap_to_name(l); |
2293 | if (t) | |
94f04347 | 2294 | fprintf(f, " %s", t); |
94f04347 LP |
2295 | } |
2296 | ||
2297 | fputs("\n", f); | |
2298 | } | |
2299 | ||
2300 | if (c->user) | |
f2d3769a | 2301 | fprintf(f, "%sUser: %s\n", prefix, c->user); |
94f04347 | 2302 | if (c->group) |
f2d3769a | 2303 | fprintf(f, "%sGroup: %s\n", prefix, c->group); |
94f04347 | 2304 | |
15ae422b | 2305 | if (strv_length(c->supplementary_groups) > 0) { |
94f04347 | 2306 | fprintf(f, "%sSupplementaryGroups:", prefix); |
15ae422b LP |
2307 | strv_fprintf(f, c->supplementary_groups); |
2308 | fputs("\n", f); | |
2309 | } | |
94f04347 | 2310 | |
5b6319dc | 2311 | if (c->pam_name) |
f2d3769a | 2312 | fprintf(f, "%sPAMName: %s\n", prefix, c->pam_name); |
5b6319dc | 2313 | |
15ae422b LP |
2314 | if (strv_length(c->read_write_dirs) > 0) { |
2315 | fprintf(f, "%sReadWriteDirs:", prefix); | |
2316 | strv_fprintf(f, c->read_write_dirs); | |
2317 | fputs("\n", f); | |
2318 | } | |
2319 | ||
2320 | if (strv_length(c->read_only_dirs) > 0) { | |
2321 | fprintf(f, "%sReadOnlyDirs:", prefix); | |
2322 | strv_fprintf(f, c->read_only_dirs); | |
2323 | fputs("\n", f); | |
2324 | } | |
94f04347 | 2325 | |
15ae422b LP |
2326 | if (strv_length(c->inaccessible_dirs) > 0) { |
2327 | fprintf(f, "%sInaccessibleDirs:", prefix); | |
2328 | strv_fprintf(f, c->inaccessible_dirs); | |
94f04347 LP |
2329 | fputs("\n", f); |
2330 | } | |
2e22afe9 | 2331 | |
169c1bda LP |
2332 | if (c->utmp_id) |
2333 | fprintf(f, | |
2334 | "%sUtmpIdentifier: %s\n", | |
2335 | prefix, c->utmp_id); | |
7b52a628 MS |
2336 | |
2337 | if (c->selinux_context) | |
2338 | fprintf(f, | |
5f8640fb LP |
2339 | "%sSELinuxContext: %s%s\n", |
2340 | prefix, c->selinux_context_ignore ? "-" : "", c->selinux_context); | |
17df7223 | 2341 | |
ac45f971 LP |
2342 | if (c->personality != 0xffffffffUL) |
2343 | fprintf(f, | |
2344 | "%sPersonality: %s\n", | |
2345 | prefix, strna(personality_to_string(c->personality))); | |
2346 | ||
17df7223 | 2347 | if (c->syscall_filter) { |
351a19b1 | 2348 | #ifdef HAVE_SECCOMP |
17df7223 LP |
2349 | Iterator j; |
2350 | void *id; | |
2351 | bool first = true; | |
351a19b1 | 2352 | #endif |
17df7223 LP |
2353 | |
2354 | fprintf(f, | |
57183d11 | 2355 | "%sSystemCallFilter: ", |
17df7223 LP |
2356 | prefix); |
2357 | ||
2358 | if (!c->syscall_whitelist) | |
2359 | fputc('~', f); | |
2360 | ||
351a19b1 | 2361 | #ifdef HAVE_SECCOMP |
17df7223 LP |
2362 | SET_FOREACH(id, c->syscall_filter, j) { |
2363 | _cleanup_free_ char *name = NULL; | |
2364 | ||
2365 | if (first) | |
2366 | first = false; | |
2367 | else | |
2368 | fputc(' ', f); | |
2369 | ||
57183d11 | 2370 | name = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE, PTR_TO_INT(id) - 1); |
17df7223 LP |
2371 | fputs(strna(name), f); |
2372 | } | |
351a19b1 | 2373 | #endif |
17df7223 LP |
2374 | |
2375 | fputc('\n', f); | |
2376 | } | |
2377 | ||
57183d11 LP |
2378 | if (c->syscall_archs) { |
2379 | #ifdef HAVE_SECCOMP | |
2380 | Iterator j; | |
2381 | void *id; | |
2382 | #endif | |
2383 | ||
2384 | fprintf(f, | |
2385 | "%sSystemCallArchitectures:", | |
2386 | prefix); | |
2387 | ||
2388 | #ifdef HAVE_SECCOMP | |
2389 | SET_FOREACH(id, c->syscall_archs, j) | |
2390 | fprintf(f, " %s", strna(seccomp_arch_to_string(PTR_TO_UINT32(id) - 1))); | |
2391 | #endif | |
2392 | fputc('\n', f); | |
2393 | } | |
2394 | ||
17df7223 LP |
2395 | if (c->syscall_errno != 0) |
2396 | fprintf(f, | |
2397 | "%sSystemCallErrorNumber: %s\n", | |
2398 | prefix, strna(errno_to_name(c->syscall_errno))); | |
eef65bf3 MS |
2399 | |
2400 | if (c->apparmor_profile) | |
2401 | fprintf(f, | |
2402 | "%sAppArmorProfile: %s%s\n", | |
2403 | prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile); | |
5cb5a6ff LP |
2404 | } |
2405 | ||
a931ad47 LP |
2406 | bool exec_context_maintains_privileges(ExecContext *c) { |
2407 | assert(c); | |
2408 | ||
2409 | /* Returns true if the process forked off would run run under | |
2410 | * an unchanged UID or as root. */ | |
2411 | ||
2412 | if (!c->user) | |
2413 | return true; | |
2414 | ||
2415 | if (streq(c->user, "root") || streq(c->user, "0")) | |
2416 | return true; | |
2417 | ||
2418 | return false; | |
2419 | } | |
2420 | ||
b58b4116 | 2421 | void exec_status_start(ExecStatus *s, pid_t pid) { |
034c6ed7 | 2422 | assert(s); |
5cb5a6ff | 2423 | |
b58b4116 LP |
2424 | zero(*s); |
2425 | s->pid = pid; | |
2426 | dual_timestamp_get(&s->start_timestamp); | |
2427 | } | |
2428 | ||
6ea832a2 | 2429 | void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status) { |
b58b4116 LP |
2430 | assert(s); |
2431 | ||
0b1f4ae6 | 2432 | if (s->pid && s->pid != pid) |
b58b4116 LP |
2433 | zero(*s); |
2434 | ||
034c6ed7 | 2435 | s->pid = pid; |
63983207 | 2436 | dual_timestamp_get(&s->exit_timestamp); |
9fb86720 | 2437 | |
034c6ed7 LP |
2438 | s->code = code; |
2439 | s->status = status; | |
169c1bda | 2440 | |
6ea832a2 LP |
2441 | if (context) { |
2442 | if (context->utmp_id) | |
2443 | utmp_put_dead_process(context->utmp_id, pid, code, status); | |
2444 | ||
2445 | exec_context_tty_reset(context); | |
2446 | } | |
9fb86720 LP |
2447 | } |
2448 | ||
2449 | void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) { | |
2450 | char buf[FORMAT_TIMESTAMP_MAX]; | |
2451 | ||
2452 | assert(s); | |
2453 | assert(f); | |
2454 | ||
9fb86720 LP |
2455 | if (s->pid <= 0) |
2456 | return; | |
2457 | ||
4c940960 LP |
2458 | prefix = strempty(prefix); |
2459 | ||
9fb86720 | 2460 | fprintf(f, |
ccd06097 ZJS |
2461 | "%sPID: "PID_FMT"\n", |
2462 | prefix, s->pid); | |
9fb86720 | 2463 | |
63983207 | 2464 | if (s->start_timestamp.realtime > 0) |
9fb86720 LP |
2465 | fprintf(f, |
2466 | "%sStart Timestamp: %s\n", | |
63983207 | 2467 | prefix, format_timestamp(buf, sizeof(buf), s->start_timestamp.realtime)); |
9fb86720 | 2468 | |
63983207 | 2469 | if (s->exit_timestamp.realtime > 0) |
9fb86720 LP |
2470 | fprintf(f, |
2471 | "%sExit Timestamp: %s\n" | |
2472 | "%sExit Code: %s\n" | |
2473 | "%sExit Status: %i\n", | |
63983207 | 2474 | prefix, format_timestamp(buf, sizeof(buf), s->exit_timestamp.realtime), |
9fb86720 LP |
2475 | prefix, sigchld_code_to_string(s->code), |
2476 | prefix, s->status); | |
5cb5a6ff | 2477 | } |
44d8db9e | 2478 | |
9e2f7c11 | 2479 | char *exec_command_line(char **argv) { |
44d8db9e LP |
2480 | size_t k; |
2481 | char *n, *p, **a; | |
2482 | bool first = true; | |
2483 | ||
9e2f7c11 | 2484 | assert(argv); |
44d8db9e | 2485 | |
9164977d | 2486 | k = 1; |
9e2f7c11 | 2487 | STRV_FOREACH(a, argv) |
44d8db9e LP |
2488 | k += strlen(*a)+3; |
2489 | ||
2490 | if (!(n = new(char, k))) | |
2491 | return NULL; | |
2492 | ||
2493 | p = n; | |
9e2f7c11 | 2494 | STRV_FOREACH(a, argv) { |
44d8db9e LP |
2495 | |
2496 | if (!first) | |
2497 | *(p++) = ' '; | |
2498 | else | |
2499 | first = false; | |
2500 | ||
2501 | if (strpbrk(*a, WHITESPACE)) { | |
2502 | *(p++) = '\''; | |
2503 | p = stpcpy(p, *a); | |
2504 | *(p++) = '\''; | |
2505 | } else | |
2506 | p = stpcpy(p, *a); | |
2507 | ||
2508 | } | |
2509 | ||
9164977d LP |
2510 | *p = 0; |
2511 | ||
44d8db9e LP |
2512 | /* FIXME: this doesn't really handle arguments that have |
2513 | * spaces and ticks in them */ | |
2514 | ||
2515 | return n; | |
2516 | } | |
2517 | ||
2518 | void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) { | |
e1d75803 | 2519 | _cleanup_free_ char *cmd = NULL; |
4c940960 | 2520 | const char *prefix2; |
44d8db9e LP |
2521 | |
2522 | assert(c); | |
2523 | assert(f); | |
2524 | ||
4c940960 LP |
2525 | prefix = strempty(prefix); |
2526 | prefix2 = strappenda(prefix, "\t"); | |
44d8db9e | 2527 | |
9e2f7c11 | 2528 | cmd = exec_command_line(c->argv); |
44d8db9e LP |
2529 | fprintf(f, |
2530 | "%sCommand Line: %s\n", | |
2531 | prefix, cmd ? cmd : strerror(ENOMEM)); | |
2532 | ||
9fb86720 | 2533 | exec_status_dump(&c->exec_status, f, prefix2); |
44d8db9e LP |
2534 | } |
2535 | ||
2536 | void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) { | |
2537 | assert(f); | |
2538 | ||
4c940960 | 2539 | prefix = strempty(prefix); |
44d8db9e LP |
2540 | |
2541 | LIST_FOREACH(command, c, c) | |
2542 | exec_command_dump(c, f, prefix); | |
2543 | } | |
94f04347 | 2544 | |
a6a80b4f LP |
2545 | void exec_command_append_list(ExecCommand **l, ExecCommand *e) { |
2546 | ExecCommand *end; | |
2547 | ||
2548 | assert(l); | |
2549 | assert(e); | |
2550 | ||
2551 | if (*l) { | |
35b8ca3a | 2552 | /* It's kind of important, that we keep the order here */ |
71fda00f LP |
2553 | LIST_FIND_TAIL(command, *l, end); |
2554 | LIST_INSERT_AFTER(command, *l, end, e); | |
a6a80b4f LP |
2555 | } else |
2556 | *l = e; | |
2557 | } | |
2558 | ||
26fd040d LP |
2559 | int exec_command_set(ExecCommand *c, const char *path, ...) { |
2560 | va_list ap; | |
2561 | char **l, *p; | |
2562 | ||
2563 | assert(c); | |
2564 | assert(path); | |
2565 | ||
2566 | va_start(ap, path); | |
2567 | l = strv_new_ap(path, ap); | |
2568 | va_end(ap); | |
2569 | ||
2570 | if (!l) | |
2571 | return -ENOMEM; | |
2572 | ||
250a918d LP |
2573 | p = strdup(path); |
2574 | if (!p) { | |
26fd040d LP |
2575 | strv_free(l); |
2576 | return -ENOMEM; | |
2577 | } | |
2578 | ||
2579 | free(c->path); | |
2580 | c->path = p; | |
2581 | ||
2582 | strv_free(c->argv); | |
2583 | c->argv = l; | |
2584 | ||
2585 | return 0; | |
2586 | } | |
2587 | ||
86b23b07 | 2588 | int exec_command_append(ExecCommand *c, const char *path, ...) { |
e63ff941 | 2589 | _cleanup_strv_free_ char **l = NULL; |
86b23b07 | 2590 | va_list ap; |
86b23b07 JS |
2591 | int r; |
2592 | ||
2593 | assert(c); | |
2594 | assert(path); | |
2595 | ||
2596 | va_start(ap, path); | |
2597 | l = strv_new_ap(path, ap); | |
2598 | va_end(ap); | |
2599 | ||
2600 | if (!l) | |
2601 | return -ENOMEM; | |
2602 | ||
2603 | r = strv_extend_strv(&c->argv, l); | |
e63ff941 | 2604 | if (r < 0) |
86b23b07 | 2605 | return r; |
86b23b07 JS |
2606 | |
2607 | return 0; | |
2608 | } | |
2609 | ||
2610 | ||
613b411c LP |
2611 | static int exec_runtime_allocate(ExecRuntime **rt) { |
2612 | ||
2613 | if (*rt) | |
2614 | return 0; | |
2615 | ||
2616 | *rt = new0(ExecRuntime, 1); | |
f146f5e1 | 2617 | if (!*rt) |
613b411c LP |
2618 | return -ENOMEM; |
2619 | ||
2620 | (*rt)->n_ref = 1; | |
2621 | (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1; | |
2622 | ||
2623 | return 0; | |
2624 | } | |
2625 | ||
2626 | int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) { | |
2627 | int r; | |
2628 | ||
2629 | assert(rt); | |
2630 | assert(c); | |
2631 | assert(id); | |
2632 | ||
2633 | if (*rt) | |
2634 | return 1; | |
2635 | ||
2636 | if (!c->private_network && !c->private_tmp) | |
2637 | return 0; | |
2638 | ||
2639 | r = exec_runtime_allocate(rt); | |
2640 | if (r < 0) | |
2641 | return r; | |
2642 | ||
2643 | if (c->private_network && (*rt)->netns_storage_socket[0] < 0) { | |
2644 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, (*rt)->netns_storage_socket) < 0) | |
2645 | return -errno; | |
2646 | } | |
2647 | ||
2648 | if (c->private_tmp && !(*rt)->tmp_dir) { | |
2649 | r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir); | |
2650 | if (r < 0) | |
2651 | return r; | |
2652 | } | |
2653 | ||
2654 | return 1; | |
2655 | } | |
2656 | ||
2657 | ExecRuntime *exec_runtime_ref(ExecRuntime *r) { | |
2658 | assert(r); | |
2659 | assert(r->n_ref > 0); | |
2660 | ||
2661 | r->n_ref++; | |
2662 | return r; | |
2663 | } | |
2664 | ||
2665 | ExecRuntime *exec_runtime_unref(ExecRuntime *r) { | |
2666 | ||
2667 | if (!r) | |
2668 | return NULL; | |
2669 | ||
2670 | assert(r->n_ref > 0); | |
2671 | ||
2672 | r->n_ref--; | |
2673 | if (r->n_ref <= 0) { | |
2674 | free(r->tmp_dir); | |
2675 | free(r->var_tmp_dir); | |
3d94f76c | 2676 | safe_close_pair(r->netns_storage_socket); |
613b411c LP |
2677 | free(r); |
2678 | } | |
2679 | ||
2680 | return NULL; | |
2681 | } | |
2682 | ||
2683 | int exec_runtime_serialize(ExecRuntime *rt, Unit *u, FILE *f, FDSet *fds) { | |
2684 | assert(u); | |
2685 | assert(f); | |
2686 | assert(fds); | |
2687 | ||
2688 | if (!rt) | |
2689 | return 0; | |
2690 | ||
2691 | if (rt->tmp_dir) | |
2692 | unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir); | |
2693 | ||
2694 | if (rt->var_tmp_dir) | |
2695 | unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir); | |
2696 | ||
2697 | if (rt->netns_storage_socket[0] >= 0) { | |
2698 | int copy; | |
2699 | ||
2700 | copy = fdset_put_dup(fds, rt->netns_storage_socket[0]); | |
2701 | if (copy < 0) | |
2702 | return copy; | |
2703 | ||
2704 | unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy); | |
2705 | } | |
2706 | ||
2707 | if (rt->netns_storage_socket[1] >= 0) { | |
2708 | int copy; | |
2709 | ||
2710 | copy = fdset_put_dup(fds, rt->netns_storage_socket[1]); | |
2711 | if (copy < 0) | |
2712 | return copy; | |
2713 | ||
2714 | unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy); | |
2715 | } | |
2716 | ||
2717 | return 0; | |
2718 | } | |
2719 | ||
2720 | int exec_runtime_deserialize_item(ExecRuntime **rt, Unit *u, const char *key, const char *value, FDSet *fds) { | |
2721 | int r; | |
2722 | ||
2723 | assert(rt); | |
2724 | assert(key); | |
2725 | assert(value); | |
2726 | ||
2727 | if (streq(key, "tmp-dir")) { | |
2728 | char *copy; | |
2729 | ||
2730 | r = exec_runtime_allocate(rt); | |
2731 | if (r < 0) | |
2732 | return r; | |
2733 | ||
2734 | copy = strdup(value); | |
2735 | if (!copy) | |
2736 | return log_oom(); | |
2737 | ||
2738 | free((*rt)->tmp_dir); | |
2739 | (*rt)->tmp_dir = copy; | |
2740 | ||
2741 | } else if (streq(key, "var-tmp-dir")) { | |
2742 | char *copy; | |
2743 | ||
2744 | r = exec_runtime_allocate(rt); | |
2745 | if (r < 0) | |
2746 | return r; | |
2747 | ||
2748 | copy = strdup(value); | |
2749 | if (!copy) | |
2750 | return log_oom(); | |
2751 | ||
2752 | free((*rt)->var_tmp_dir); | |
2753 | (*rt)->var_tmp_dir = copy; | |
2754 | ||
2755 | } else if (streq(key, "netns-socket-0")) { | |
2756 | int fd; | |
2757 | ||
2758 | r = exec_runtime_allocate(rt); | |
2759 | if (r < 0) | |
2760 | return r; | |
2761 | ||
2762 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
2763 | log_debug_unit(u->id, "Failed to parse netns socket value %s", value); | |
2764 | else { | |
03e334a1 | 2765 | safe_close((*rt)->netns_storage_socket[0]); |
613b411c LP |
2766 | (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd); |
2767 | } | |
2768 | } else if (streq(key, "netns-socket-1")) { | |
2769 | int fd; | |
2770 | ||
2771 | r = exec_runtime_allocate(rt); | |
2772 | if (r < 0) | |
2773 | return r; | |
2774 | ||
2775 | if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd)) | |
2776 | log_debug_unit(u->id, "Failed to parse netns socket value %s", value); | |
2777 | else { | |
03e334a1 | 2778 | safe_close((*rt)->netns_storage_socket[1]); |
613b411c LP |
2779 | (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd); |
2780 | } | |
2781 | } else | |
2782 | return 0; | |
2783 | ||
2784 | return 1; | |
2785 | } | |
2786 | ||
2787 | static void *remove_tmpdir_thread(void *p) { | |
2788 | _cleanup_free_ char *path = p; | |
2789 | ||
2790 | rm_rf_dangerous(path, false, true, false); | |
2791 | return NULL; | |
2792 | } | |
2793 | ||
2794 | void exec_runtime_destroy(ExecRuntime *rt) { | |
98b47d54 LP |
2795 | int r; |
2796 | ||
613b411c LP |
2797 | if (!rt) |
2798 | return; | |
2799 | ||
2800 | /* If there are multiple users of this, let's leave the stuff around */ | |
2801 | if (rt->n_ref > 1) | |
2802 | return; | |
2803 | ||
2804 | if (rt->tmp_dir) { | |
2805 | log_debug("Spawning thread to nuke %s", rt->tmp_dir); | |
98b47d54 LP |
2806 | |
2807 | r = asynchronous_job(remove_tmpdir_thread, rt->tmp_dir); | |
2808 | if (r < 0) { | |
2809 | log_warning("Failed to nuke %s: %s", rt->tmp_dir, strerror(-r)); | |
2810 | free(rt->tmp_dir); | |
2811 | } | |
2812 | ||
613b411c LP |
2813 | rt->tmp_dir = NULL; |
2814 | } | |
2815 | ||
2816 | if (rt->var_tmp_dir) { | |
2817 | log_debug("Spawning thread to nuke %s", rt->var_tmp_dir); | |
98b47d54 LP |
2818 | |
2819 | r = asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir); | |
2820 | if (r < 0) { | |
2821 | log_warning("Failed to nuke %s: %s", rt->var_tmp_dir, strerror(-r)); | |
2822 | free(rt->var_tmp_dir); | |
2823 | } | |
2824 | ||
613b411c LP |
2825 | rt->var_tmp_dir = NULL; |
2826 | } | |
2827 | ||
3d94f76c | 2828 | safe_close_pair(rt->netns_storage_socket); |
613b411c LP |
2829 | } |
2830 | ||
80876c20 LP |
2831 | static const char* const exec_input_table[_EXEC_INPUT_MAX] = { |
2832 | [EXEC_INPUT_NULL] = "null", | |
2833 | [EXEC_INPUT_TTY] = "tty", | |
2834 | [EXEC_INPUT_TTY_FORCE] = "tty-force", | |
4f2d528d LP |
2835 | [EXEC_INPUT_TTY_FAIL] = "tty-fail", |
2836 | [EXEC_INPUT_SOCKET] = "socket" | |
80876c20 LP |
2837 | }; |
2838 | ||
8a0867d6 LP |
2839 | DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput); |
2840 | ||
94f04347 | 2841 | static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = { |
80876c20 | 2842 | [EXEC_OUTPUT_INHERIT] = "inherit", |
94f04347 | 2843 | [EXEC_OUTPUT_NULL] = "null", |
80876c20 | 2844 | [EXEC_OUTPUT_TTY] = "tty", |
94f04347 | 2845 | [EXEC_OUTPUT_SYSLOG] = "syslog", |
28dbc1e8 | 2846 | [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console", |
9a6bca7a | 2847 | [EXEC_OUTPUT_KMSG] = "kmsg", |
28dbc1e8 | 2848 | [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console", |
706343f4 LP |
2849 | [EXEC_OUTPUT_JOURNAL] = "journal", |
2850 | [EXEC_OUTPUT_JOURNAL_AND_CONSOLE] = "journal+console", | |
4f2d528d | 2851 | [EXEC_OUTPUT_SOCKET] = "socket" |
94f04347 LP |
2852 | }; |
2853 | ||
2854 | DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput); |