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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
ec863ba6 | 2 | /*** |
96b2fb93 | 3 | Copyright © 2015 Werner Fink |
ec863ba6 LP |
4 | ***/ |
5 | ||
ec863ba6 | 6 | #include <errno.h> |
3f6fd1ba LP |
7 | #include <fcntl.h> |
8 | #include <getopt.h> | |
9 | #include <poll.h> | |
6af62124 | 10 | #include <signal.h> |
3f6fd1ba LP |
11 | #include <stdbool.h> |
12 | #include <stddef.h> | |
ec863ba6 | 13 | #include <string.h> |
6af62124 | 14 | #include <sys/prctl.h> |
3f6fd1ba | 15 | #include <sys/signalfd.h> |
ec863ba6 | 16 | #include <sys/socket.h> |
ca78ad1d ZJS |
17 | #include <sys/stat.h> |
18 | #include <sys/types.h> | |
ec863ba6 | 19 | #include <sys/un.h> |
ca78ad1d | 20 | #include <sys/wait.h> |
ec863ba6 | 21 | #include <unistd.h> |
ec863ba6 | 22 | |
b5efdb8a | 23 | #include "alloc-util.h" |
3f6fd1ba LP |
24 | #include "ask-password-api.h" |
25 | #include "conf-parser.h" | |
26 | #include "def.h" | |
a0956174 | 27 | #include "dirent-util.h" |
6af62124 | 28 | #include "exit-status.h" |
3ffd4af2 | 29 | #include "fd-util.h" |
6af62124 | 30 | #include "fileio.h" |
27c3112d | 31 | #include "fs-util.h" |
6af62124 | 32 | #include "hashmap.h" |
c004493c | 33 | #include "io-util.h" |
6af62124 | 34 | #include "macro.h" |
5e332028 | 35 | #include "main-func.h" |
0a970718 | 36 | #include "memory-util.h" |
49e942b2 | 37 | #include "mkdir.h" |
9eb977db | 38 | #include "path-util.h" |
294bf0c3 | 39 | #include "pretty-print.h" |
3f6fd1ba | 40 | #include "process-util.h" |
23d5dd16 | 41 | #include "set.h" |
3f6fd1ba | 42 | #include "signal-util.h" |
e5ebf783 | 43 | #include "socket-util.h" |
07630cea | 44 | #include "string-util.h" |
21bc923a | 45 | #include "strv.h" |
288a74cc | 46 | #include "terminal-util.h" |
3f6fd1ba | 47 | #include "utmp-wtmp.h" |
ec863ba6 LP |
48 | |
49 | static enum { | |
50 | ACTION_LIST, | |
51 | ACTION_QUERY, | |
52 | ACTION_WATCH, | |
53 | ACTION_WALL | |
54 | } arg_action = ACTION_QUERY; | |
55 | ||
e5ebf783 | 56 | static bool arg_plymouth = false; |
0cf84693 | 57 | static bool arg_console = false; |
6af62124 | 58 | static const char *arg_device = NULL; |
e5ebf783 | 59 | |
bbada6d7 | 60 | static int send_passwords(const char *socket_name, char **passwords) { |
e693a932 | 61 | _cleanup_(erase_and_freep) char *packet = NULL; |
bbada6d7 | 62 | _cleanup_close_ int socket_fd = -1; |
15a3e96f | 63 | union sockaddr_union sa = {}; |
bbada6d7 JAS |
64 | size_t packet_length = 1; |
65 | char **p, *d; | |
5439206b | 66 | ssize_t n; |
e693a932 | 67 | int salen; |
bbada6d7 JAS |
68 | |
69 | assert(socket_name); | |
70 | ||
15a3e96f LP |
71 | salen = sockaddr_un_set_path(&sa.un, socket_name); |
72 | if (salen < 0) | |
73 | return salen; | |
74 | ||
bbada6d7 JAS |
75 | STRV_FOREACH(p, passwords) |
76 | packet_length += strlen(*p) + 1; | |
77 | ||
78 | packet = new(char, packet_length); | |
79 | if (!packet) | |
80 | return -ENOMEM; | |
81 | ||
82 | packet[0] = '+'; | |
83 | ||
84 | d = packet + 1; | |
85 | STRV_FOREACH(p, passwords) | |
86 | d = stpcpy(d, *p) + 1; | |
87 | ||
88 | socket_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0); | |
e693a932 ZJS |
89 | if (socket_fd < 0) |
90 | return log_debug_errno(errno, "socket(): %m"); | |
bbada6d7 | 91 | |
15a3e96f | 92 | n = sendto(socket_fd, packet, packet_length, MSG_NOSIGNAL, &sa.sa, salen); |
e693a932 ZJS |
93 | if (n < 0) |
94 | return log_debug_errno(errno, "sendto(): %m"); | |
5439206b | 95 | |
e693a932 | 96 | return (int) n; |
bbada6d7 JAS |
97 | } |
98 | ||
85c221eb FB |
99 | static bool wall_tty_match(const char *path, void *userdata) { |
100 | _cleanup_free_ char *p = NULL; | |
101 | _cleanup_close_ int fd = -1; | |
102 | struct stat st; | |
103 | ||
104 | if (!path_is_absolute(path)) | |
105 | path = strjoina("/dev/", path); | |
106 | ||
107 | if (lstat(path, &st) < 0) { | |
108 | log_debug_errno(errno, "Failed to stat %s: %m", path); | |
109 | return true; | |
110 | } | |
111 | ||
112 | if (!S_ISCHR(st.st_mode)) { | |
113 | log_debug("%s is not a character device.", path); | |
114 | return true; | |
115 | } | |
116 | ||
117 | /* We use named pipes to ensure that wall messages suggesting | |
118 | * password entry are not printed over password prompts | |
119 | * already shown. We use the fact here that opening a pipe in | |
120 | * non-blocking mode for write-only will succeed only if | |
121 | * there's some writer behind it. Using pipes has the | |
122 | * advantage that the block will automatically go away if the | |
123 | * process dies. */ | |
124 | ||
125 | if (asprintf(&p, "/run/systemd/ask-password-block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0) { | |
126 | log_oom(); | |
127 | return true; | |
128 | } | |
129 | ||
130 | fd = open(p, O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
131 | if (fd < 0) { | |
132 | log_debug_errno(errno, "Failed to open the wall pipe: %m"); | |
133 | return 1; | |
134 | } | |
135 | ||
136 | /* What, we managed to open the pipe? Then this tty is filtered. */ | |
137 | return 0; | |
138 | } | |
139 | ||
87c4444a FB |
140 | static int agent_ask_password_tty( |
141 | const char *message, | |
142 | usec_t until, | |
143 | AskPasswordFlags flags, | |
144 | const char *flag_file, | |
145 | char ***ret) { | |
146 | ||
147 | int tty_fd = -1; | |
148 | int r; | |
149 | ||
150 | if (arg_console) { | |
151 | const char *con = arg_device ?: "/dev/console"; | |
152 | ||
153 | tty_fd = acquire_terminal(con, ACQUIRE_TERMINAL_WAIT, USEC_INFINITY); | |
154 | if (tty_fd < 0) | |
155 | return log_error_errno(tty_fd, "Failed to acquire %s: %m", con); | |
156 | ||
157 | r = reset_terminal_fd(tty_fd, true); | |
158 | if (r < 0) | |
159 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
160 | ||
161 | } | |
162 | ||
163 | r = ask_password_tty(tty_fd, message, NULL, until, flags, flag_file, ret); | |
164 | ||
165 | if (arg_console) { | |
166 | tty_fd = safe_close(tty_fd); | |
167 | release_terminal(); | |
168 | } | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
5461cdeb | 173 | static int process_one_password_file(const char *filename) { |
bbada6d7 | 174 | _cleanup_free_ char *socket_name = NULL, *message = NULL; |
1602b008 | 175 | bool accept_cached = false, echo = false; |
ec863ba6 LP |
176 | uint64_t not_after = 0; |
177 | unsigned pid = 0; | |
ec863ba6 | 178 | |
f975e971 LP |
179 | const ConfigTableItem items[] = { |
180 | { "Ask", "Socket", config_parse_string, 0, &socket_name }, | |
181 | { "Ask", "NotAfter", config_parse_uint64, 0, ¬_after }, | |
182 | { "Ask", "Message", config_parse_string, 0, &message }, | |
183 | { "Ask", "PID", config_parse_unsigned, 0, &pid }, | |
184 | { "Ask", "AcceptCached", config_parse_bool, 0, &accept_cached }, | |
64845bdc | 185 | { "Ask", "Echo", config_parse_bool, 0, &echo }, |
1d749d04 | 186 | {} |
ec863ba6 LP |
187 | }; |
188 | ||
ec863ba6 | 189 | int r; |
ec863ba6 LP |
190 | |
191 | assert(filename); | |
192 | ||
36f822c4 ZJS |
193 | r = config_parse(NULL, filename, NULL, |
194 | NULL, | |
195 | config_item_table_lookup, items, | |
bcde742e | 196 | CONFIG_PARSE_RELAXED|CONFIG_PARSE_WARN, NULL); |
36f822c4 ZJS |
197 | if (r < 0) |
198 | return r; | |
ec863ba6 | 199 | |
baaa35ad ZJS |
200 | if (!socket_name) |
201 | return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), | |
202 | "Invalid password file %s", filename); | |
ec863ba6 | 203 | |
e46eab86 ZJS |
204 | if (not_after > 0 && now(CLOCK_MONOTONIC) > not_after) |
205 | return 0; | |
ec863ba6 | 206 | |
e46eab86 ZJS |
207 | if (pid > 0 && !pid_is_alive(pid)) |
208 | return 0; | |
ded80335 | 209 | |
87c4444a FB |
210 | switch (arg_action) { |
211 | case ACTION_LIST: | |
ec863ba6 | 212 | printf("'%s' (PID %u)\n", message, pid); |
87c4444a | 213 | return 0; |
e46eab86 | 214 | |
87c4444a FB |
215 | case ACTION_WALL: { |
216 | _cleanup_free_ char *wall = NULL; | |
ec863ba6 | 217 | |
87c4444a FB |
218 | if (asprintf(&wall, |
219 | "Password entry required for \'%s\' (PID %u).\r\n" | |
220 | "Please enter password with the systemd-tty-ask-password-agent tool.", | |
221 | message, | |
222 | pid) < 0) | |
223 | return log_oom(); | |
e46eab86 | 224 | |
87c4444a FB |
225 | (void) utmp_wall(wall, NULL, NULL, wall_tty_match, NULL); |
226 | return 0; | |
227 | } | |
228 | case ACTION_QUERY: | |
229 | case ACTION_WATCH: { | |
bbada6d7 | 230 | _cleanup_strv_free_erase_ char **passwords = NULL; |
87c4444a | 231 | AskPasswordFlags flags = 0; |
ec863ba6 LP |
232 | |
233 | if (access(socket_name, W_OK) < 0) { | |
ec863ba6 LP |
234 | if (arg_action == ACTION_QUERY) |
235 | log_info("Not querying '%s' (PID %u), lacking privileges.", message, pid); | |
236 | ||
e46eab86 | 237 | return 0; |
ec863ba6 LP |
238 | } |
239 | ||
87c4444a FB |
240 | SET_FLAG(flags, ASK_PASSWORD_ACCEPT_CACHED, accept_cached); |
241 | SET_FLAG(flags, ASK_PASSWORD_CONSOLE_COLOR, arg_console); | |
242 | SET_FLAG(flags, ASK_PASSWORD_ECHO, echo); | |
3d18b167 | 243 | |
87c4444a FB |
244 | if (arg_plymouth) |
245 | r = ask_password_plymouth(message, not_after, flags, filename, &passwords); | |
246 | else | |
247 | r = agent_ask_password_tty(message, not_after, flags, filename, &passwords); | |
0cf84693 | 248 | |
87c4444a FB |
249 | if (r < 0) { |
250 | /* If the query went away, that's OK */ | |
251 | if (IN_SET(r, -ETIME, -ENOENT)) | |
252 | return 0; | |
e5ebf783 | 253 | |
bbada6d7 | 254 | return log_error_errno(r, "Failed to query password: %m"); |
87c4444a | 255 | } |
ec863ba6 | 256 | |
d325f244 FB |
257 | if (strv_isempty(passwords)) |
258 | return -ECANCELED; | |
259 | ||
bbada6d7 | 260 | r = send_passwords(socket_name, passwords); |
00843602 | 261 | if (r < 0) |
bbada6d7 | 262 | return log_error_errno(r, "Failed to send: %m"); |
87c4444a FB |
263 | break; |
264 | } | |
ec863ba6 LP |
265 | } |
266 | ||
e46eab86 | 267 | return 0; |
ec863ba6 LP |
268 | } |
269 | ||
0cf84693 | 270 | static int wall_tty_block(void) { |
1d749d04 | 271 | _cleanup_free_ char *p = NULL; |
fc116c6a | 272 | dev_t devnr; |
00843602 | 273 | int fd, r; |
7af53310 | 274 | |
4d6d6518 | 275 | r = get_ctty_devnr(0, &devnr); |
e287086b LP |
276 | if (r == -ENXIO) /* We have no controlling tty */ |
277 | return -ENOTTY; | |
4d6d6518 | 278 | if (r < 0) |
00843602 | 279 | return log_error_errno(r, "Failed to get controlling TTY: %m"); |
7af53310 | 280 | |
2b583ce6 | 281 | if (asprintf(&p, "/run/systemd/ask-password-block/%u:%u", major(devnr), minor(devnr)) < 0) |
00843602 | 282 | return log_oom(); |
7af53310 | 283 | |
e3e2cf07 LP |
284 | (void) mkdir_parents_label(p, 0700); |
285 | (void) mkfifo(p, 0600); | |
7af53310 LP |
286 | |
287 | fd = open(p, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
7af53310 | 288 | if (fd < 0) |
2ee4e222 | 289 | return log_debug_errno(errno, "Failed to open %s: %m", p); |
7af53310 LP |
290 | |
291 | return fd; | |
292 | } | |
293 | ||
5461cdeb | 294 | static int process_password_files(void) { |
1d749d04 | 295 | _cleanup_closedir_ DIR *d; |
ec863ba6 LP |
296 | struct dirent *de; |
297 | int r = 0; | |
298 | ||
1d749d04 ZJS |
299 | d = opendir("/run/systemd/ask-password"); |
300 | if (!d) { | |
ec863ba6 LP |
301 | if (errno == ENOENT) |
302 | return 0; | |
303 | ||
ad71eee5 | 304 | return log_error_errno(errno, "Failed to open /run/systemd/ask-password: %m"); |
ec863ba6 LP |
305 | } |
306 | ||
1503bcb1 | 307 | FOREACH_DIRENT(de, d, return log_error_errno(errno, "Failed to read directory: %m")) { |
85c221eb | 308 | _cleanup_free_ char *p = NULL; |
ec863ba6 LP |
309 | int q; |
310 | ||
85c221eb | 311 | /* We only support /run on tmpfs, hence we can rely on |
1a6f4df6 LP |
312 | * d_type to be reliable */ |
313 | ||
ec863ba6 LP |
314 | if (de->d_type != DT_REG) |
315 | continue; | |
316 | ||
ec863ba6 LP |
317 | if (!startswith(de->d_name, "ask.")) |
318 | continue; | |
319 | ||
b910cc72 | 320 | p = path_join("/run/systemd/ask-password", de->d_name); |
1d749d04 ZJS |
321 | if (!p) |
322 | return log_oom(); | |
ec863ba6 | 323 | |
5461cdeb | 324 | q = process_one_password_file(p); |
1d749d04 | 325 | if (q < 0 && r == 0) |
ec863ba6 | 326 | r = q; |
ec863ba6 LP |
327 | } |
328 | ||
ec863ba6 LP |
329 | return r; |
330 | } | |
331 | ||
13227570 | 332 | static int process_and_watch_password_files(bool watch) { |
b9ba604e | 333 | enum { |
b9ba604e | 334 | FD_SIGNAL, |
13227570 | 335 | FD_INOTIFY, |
b9ba604e LP |
336 | _FD_MAX |
337 | }; | |
338 | ||
1d749d04 | 339 | _cleanup_close_ int notify = -1, signal_fd = -1, tty_block_fd = -1; |
7d895205 | 340 | struct pollfd pollfd[_FD_MAX]; |
b9ba604e | 341 | sigset_t mask; |
ec863ba6 LP |
342 | int r; |
343 | ||
0cf84693 | 344 | tty_block_fd = wall_tty_block(); |
7af53310 | 345 | |
00843602 | 346 | (void) mkdir_p_label("/run/systemd/ask-password", 0755); |
ec863ba6 | 347 | |
72c0a2c2 | 348 | assert_se(sigemptyset(&mask) >= 0); |
998c6da8 | 349 | assert_se(sigset_add_many(&mask, SIGTERM, -1) >= 0); |
72c0a2c2 | 350 | assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) >= 0); |
b9ba604e | 351 | |
13227570 FB |
352 | if (watch) { |
353 | signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); | |
354 | if (signal_fd < 0) | |
355 | return log_error_errno(errno, "Failed to allocate signal file descriptor: %m"); | |
b9ba604e | 356 | |
7d895205 | 357 | pollfd[FD_SIGNAL] = (struct pollfd) { .fd = signal_fd, .events = POLLIN }; |
13227570 FB |
358 | |
359 | notify = inotify_init1(IN_CLOEXEC); | |
360 | if (notify < 0) | |
361 | return log_error_errno(errno, "Failed to allocate directory watch: %m"); | |
362 | ||
363 | r = inotify_add_watch_and_warn(notify, "/run/systemd/ask-password", IN_CLOSE_WRITE|IN_MOVED_TO); | |
364 | if (r < 0) | |
365 | return r; | |
366 | ||
7d895205 | 367 | pollfd[FD_INOTIFY] = (struct pollfd) { .fd = notify, .events = POLLIN }; |
13227570 | 368 | } |
ec863ba6 LP |
369 | |
370 | for (;;) { | |
d325f244 FB |
371 | int timeout = -1; |
372 | ||
5461cdeb | 373 | r = process_password_files(); |
d325f244 FB |
374 | if (r < 0) { |
375 | if (r == -ECANCELED) | |
376 | /* Disable poll() timeout since at least one password has | |
377 | * been skipped and therefore one file remains and is | |
378 | * unlikely to trigger any events. */ | |
379 | timeout = 0; | |
380 | else | |
825721eb FB |
381 | /* FIXME: we should do something here since otherwise the service |
382 | * requesting the password won't notice the error and will wait | |
383 | * indefinitely. */ | |
d325f244 FB |
384 | log_error_errno(r, "Failed to process password: %m"); |
385 | } | |
ec863ba6 | 386 | |
13227570 FB |
387 | if (!watch) |
388 | break; | |
389 | ||
7d895205 | 390 | if (poll(pollfd, _FD_MAX, timeout) < 0) { |
ec863ba6 LP |
391 | if (errno == EINTR) |
392 | continue; | |
393 | ||
1d749d04 | 394 | return -errno; |
ec863ba6 LP |
395 | } |
396 | ||
b9ba604e | 397 | if (pollfd[FD_INOTIFY].revents != 0) |
00843602 | 398 | (void) flush_fd(notify); |
b9ba604e LP |
399 | |
400 | if (pollfd[FD_SIGNAL].revents != 0) | |
401 | break; | |
ec863ba6 LP |
402 | } |
403 | ||
1d749d04 | 404 | return 0; |
ec863ba6 LP |
405 | } |
406 | ||
37ec0fdd LP |
407 | static int help(void) { |
408 | _cleanup_free_ char *link = NULL; | |
409 | int r; | |
410 | ||
411 | r = terminal_urlify_man("systemd-tty-ask-password-agent", "1", &link); | |
412 | if (r < 0) | |
413 | return log_oom(); | |
414 | ||
ec863ba6 LP |
415 | printf("%s [OPTIONS...]\n\n" |
416 | "Process system password requests.\n\n" | |
e5ebf783 | 417 | " -h --help Show this help\n" |
c52f663b | 418 | " --version Show package version\n" |
e5ebf783 LP |
419 | " --list Show pending password requests\n" |
420 | " --query Process pending password requests\n" | |
35b8ca3a HH |
421 | " --watch Continuously process password requests\n" |
422 | " --wall Continuously forward password requests to wall\n" | |
0cf84693 | 423 | " --plymouth Ask question with Plymouth instead of on TTY\n" |
37ec0fdd LP |
424 | " --console Ask question on /dev/console instead of current TTY\n" |
425 | "\nSee the %s for details.\n" | |
426 | , program_invocation_short_name | |
427 | , link | |
428 | ); | |
429 | ||
430 | return 0; | |
ec863ba6 LP |
431 | } |
432 | ||
433 | static int parse_argv(int argc, char *argv[]) { | |
434 | ||
435 | enum { | |
436 | ARG_LIST = 0x100, | |
437 | ARG_QUERY, | |
438 | ARG_WATCH, | |
439 | ARG_WALL, | |
0cf84693 | 440 | ARG_PLYMOUTH, |
c52f663b LP |
441 | ARG_CONSOLE, |
442 | ARG_VERSION | |
ec863ba6 LP |
443 | }; |
444 | ||
445 | static const struct option options[] = { | |
6af62124 WF |
446 | { "help", no_argument, NULL, 'h' }, |
447 | { "version", no_argument, NULL, ARG_VERSION }, | |
448 | { "list", no_argument, NULL, ARG_LIST }, | |
449 | { "query", no_argument, NULL, ARG_QUERY }, | |
450 | { "watch", no_argument, NULL, ARG_WATCH }, | |
451 | { "wall", no_argument, NULL, ARG_WALL }, | |
452 | { "plymouth", no_argument, NULL, ARG_PLYMOUTH }, | |
453 | { "console", optional_argument, NULL, ARG_CONSOLE }, | |
eb9da376 | 454 | {} |
ec863ba6 LP |
455 | }; |
456 | ||
457 | int c; | |
458 | ||
459 | assert(argc >= 0); | |
460 | assert(argv); | |
461 | ||
601185b4 | 462 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) |
ec863ba6 LP |
463 | |
464 | switch (c) { | |
465 | ||
466 | case 'h': | |
37ec0fdd | 467 | return help(); |
ec863ba6 | 468 | |
c52f663b | 469 | case ARG_VERSION: |
3f6fd1ba | 470 | return version(); |
c52f663b | 471 | |
ec863ba6 LP |
472 | case ARG_LIST: |
473 | arg_action = ACTION_LIST; | |
474 | break; | |
475 | ||
476 | case ARG_QUERY: | |
477 | arg_action = ACTION_QUERY; | |
478 | break; | |
479 | ||
480 | case ARG_WATCH: | |
481 | arg_action = ACTION_WATCH; | |
482 | break; | |
483 | ||
484 | case ARG_WALL: | |
485 | arg_action = ACTION_WALL; | |
486 | break; | |
487 | ||
e5ebf783 LP |
488 | case ARG_PLYMOUTH: |
489 | arg_plymouth = true; | |
490 | break; | |
491 | ||
0cf84693 LP |
492 | case ARG_CONSOLE: |
493 | arg_console = true; | |
6af62124 WF |
494 | if (optarg) { |
495 | ||
baaa35ad ZJS |
496 | if (isempty(optarg)) |
497 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
498 | "Empty console device path is not allowed."); | |
6af62124 WF |
499 | |
500 | arg_device = optarg; | |
501 | } | |
0cf84693 LP |
502 | break; |
503 | ||
ec863ba6 LP |
504 | case '?': |
505 | return -EINVAL; | |
506 | ||
507 | default: | |
eb9da376 | 508 | assert_not_reached("Unhandled option"); |
ec863ba6 | 509 | } |
ec863ba6 | 510 | |
baaa35ad ZJS |
511 | if (optind != argc) |
512 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
513 | "%s takes no arguments.", program_invocation_short_name); | |
ec863ba6 | 514 | |
6af62124 WF |
515 | if (arg_plymouth || arg_console) { |
516 | ||
baaa35ad ZJS |
517 | if (!IN_SET(arg_action, ACTION_QUERY, ACTION_WATCH)) |
518 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
519 | "Options --query and --watch conflict."); | |
6af62124 | 520 | |
baaa35ad ZJS |
521 | if (arg_plymouth && arg_console) |
522 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
523 | "Options --plymouth and --console conflict."); | |
6af62124 WF |
524 | } |
525 | ||
ec863ba6 LP |
526 | return 1; |
527 | } | |
528 | ||
6af62124 | 529 | /* |
189b0377 LP |
530 | * To be able to ask on all terminal devices of /dev/console the devices are collected. If more than one |
531 | * device is found, then on each of the terminals a inquiring task is forked. Every task has its own session | |
532 | * and its own controlling terminal. If one of the tasks does handle a password, the remaining tasks will be | |
533 | * terminated. | |
6af62124 | 534 | */ |
6e79d2b5 | 535 | static int ask_on_this_console(const char *tty, pid_t *ret_pid, char **arguments) { |
d8502964 | 536 | static const struct sigaction sigchld = { |
6af62124 WF |
537 | .sa_handler = nop_signal_handler, |
538 | .sa_flags = SA_NOCLDSTOP | SA_RESTART, | |
539 | }; | |
d8502964 LP |
540 | static const struct sigaction sighup = { |
541 | .sa_handler = SIG_DFL, | |
542 | .sa_flags = SA_RESTART, | |
543 | }; | |
4c253ed1 | 544 | int r; |
6af62124 | 545 | |
d8502964 LP |
546 | assert_se(sigaction(SIGCHLD, &sigchld, NULL) >= 0); |
547 | assert_se(sigaction(SIGHUP, &sighup, NULL) >= 0); | |
6af62124 WF |
548 | assert_se(sigprocmask_many(SIG_UNBLOCK, NULL, SIGHUP, SIGCHLD, -1) >= 0); |
549 | ||
4bec7f09 | 550 | r = safe_fork("(sd-passwd)", FORK_RESET_SIGNALS|FORK_LOG, ret_pid); |
4c253ed1 | 551 | if (r < 0) |
b6e1fff1 | 552 | return r; |
4c253ed1 | 553 | if (r == 0) { |
ed179fd7 | 554 | char **i; |
6af62124 WF |
555 | |
556 | assert_se(prctl(PR_SET_PDEATHSIG, SIGHUP) >= 0); | |
557 | ||
ed179fd7 LP |
558 | STRV_FOREACH(i, arguments) { |
559 | char *k; | |
560 | ||
561 | if (!streq(*i, "--console")) | |
562 | continue; | |
563 | ||
564 | k = strjoin("--console=", tty); | |
565 | if (!k) { | |
566 | log_oom(); | |
567 | _exit(EXIT_FAILURE); | |
6af62124 | 568 | } |
6af62124 | 569 | |
ed179fd7 LP |
570 | free_and_replace(*i, k); |
571 | } | |
6af62124 | 572 | |
65e5d693 | 573 | execv(SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, arguments); |
6af62124 WF |
574 | _exit(EXIT_FAILURE); |
575 | } | |
4c253ed1 | 576 | |
6af62124 WF |
577 | return 0; |
578 | } | |
579 | ||
580 | static void terminate_agents(Set *pids) { | |
581 | struct timespec ts; | |
582 | siginfo_t status = {}; | |
583 | sigset_t set; | |
584 | Iterator i; | |
585 | void *p; | |
586 | int r, signum; | |
587 | ||
588 | /* | |
589 | * Request termination of the remaining processes as those | |
590 | * are not required anymore. | |
591 | */ | |
592 | SET_FOREACH(p, pids, i) | |
593 | (void) kill(PTR_TO_PID(p), SIGTERM); | |
594 | ||
595 | /* | |
596 | * Collect the processes which have go away. | |
597 | */ | |
598 | assert_se(sigemptyset(&set) >= 0); | |
599 | assert_se(sigaddset(&set, SIGCHLD) >= 0); | |
600 | timespec_store(&ts, 50 * USEC_PER_MSEC); | |
601 | ||
602 | while (!set_isempty(pids)) { | |
603 | ||
604 | zero(status); | |
605 | r = waitid(P_ALL, 0, &status, WEXITED|WNOHANG); | |
606 | if (r < 0 && errno == EINTR) | |
607 | continue; | |
608 | ||
609 | if (r == 0 && status.si_pid > 0) { | |
610 | set_remove(pids, PID_TO_PTR(status.si_pid)); | |
611 | continue; | |
612 | } | |
613 | ||
614 | signum = sigtimedwait(&set, NULL, &ts); | |
615 | if (signum < 0) { | |
616 | if (errno != EAGAIN) | |
617 | log_error_errno(errno, "sigtimedwait() failed: %m"); | |
618 | break; | |
619 | } | |
620 | assert(signum == SIGCHLD); | |
621 | } | |
622 | ||
623 | /* | |
624 | * Kill hanging processes. | |
625 | */ | |
626 | SET_FOREACH(p, pids, i) { | |
627 | log_warning("Failed to terminate child %d, killing it", PTR_TO_PID(p)); | |
628 | (void) kill(PTR_TO_PID(p), SIGKILL); | |
629 | } | |
630 | } | |
631 | ||
ed179fd7 | 632 | static int ask_on_consoles(char *argv[]) { |
6af62124 | 633 | _cleanup_set_free_ Set *pids = NULL; |
6e79d2b5 | 634 | _cleanup_strv_free_ char **consoles = NULL, **arguments = NULL; |
6af62124 WF |
635 | siginfo_t status = {}; |
636 | char **tty; | |
637 | pid_t pid; | |
638 | int r; | |
639 | ||
640 | r = get_kernel_consoles(&consoles); | |
641 | if (r < 0) | |
642 | return log_error_errno(r, "Failed to determine devices of /dev/console: %m"); | |
643 | ||
644 | pids = set_new(NULL); | |
645 | if (!pids) | |
646 | return log_oom(); | |
647 | ||
6e79d2b5 YW |
648 | arguments = strv_copy(argv); |
649 | if (!arguments) | |
650 | return log_oom(); | |
651 | ||
6af62124 WF |
652 | /* Start an agent on each console. */ |
653 | STRV_FOREACH(tty, consoles) { | |
6e79d2b5 | 654 | r = ask_on_this_console(*tty, &pid, arguments); |
6af62124 WF |
655 | if (r < 0) |
656 | return r; | |
657 | ||
658 | if (set_put(pids, PID_TO_PTR(pid)) < 0) | |
659 | return log_oom(); | |
660 | } | |
661 | ||
662 | /* Wait for an agent to exit. */ | |
663 | for (;;) { | |
664 | zero(status); | |
665 | ||
666 | if (waitid(P_ALL, 0, &status, WEXITED) < 0) { | |
667 | if (errno == EINTR) | |
668 | continue; | |
669 | ||
670 | return log_error_errno(errno, "waitid() failed: %m"); | |
671 | } | |
672 | ||
673 | set_remove(pids, PID_TO_PTR(status.si_pid)); | |
674 | break; | |
675 | } | |
676 | ||
1f0958f6 | 677 | if (!is_clean_exit(status.si_code, status.si_status, EXIT_CLEAN_DAEMON, NULL)) |
6af62124 WF |
678 | log_error("Password agent failed with: %d", status.si_status); |
679 | ||
680 | terminate_agents(pids); | |
681 | return 0; | |
682 | } | |
683 | ||
0420d20d | 684 | static int run(int argc, char *argv[]) { |
ec863ba6 LP |
685 | int r; |
686 | ||
6bf3c61c | 687 | log_setup_service(); |
ec863ba6 | 688 | |
4c12626c LP |
689 | umask(0022); |
690 | ||
1d749d04 ZJS |
691 | r = parse_argv(argc, argv); |
692 | if (r <= 0) | |
0420d20d | 693 | return r; |
ec863ba6 | 694 | |
6af62124 WF |
695 | if (arg_console && !arg_device) |
696 | /* | |
0420d20d | 697 | * Spawn a separate process for each console device. |
6af62124 | 698 | */ |
ed179fd7 | 699 | return ask_on_consoles(argv); |
0cf84693 | 700 | |
0420d20d ZJS |
701 | if (arg_device) { |
702 | /* | |
703 | * Later on, a controlling terminal will be acquired, | |
704 | * therefore the current process has to become a session | |
705 | * leader and should not have a controlling terminal already. | |
706 | */ | |
707 | (void) setsid(); | |
708 | (void) release_terminal(); | |
6af62124 | 709 | } |
96707269 | 710 | |
13227570 | 711 | return process_and_watch_password_files(arg_action != ACTION_QUERY); |
ec863ba6 | 712 | } |
0420d20d ZJS |
713 | |
714 | DEFINE_MAIN_FUNCTION(run); |