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Commit | Line | Data |
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ec863ba6 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
6af62124 | 5 | Copyright 2015 Werner Fink |
ec863ba6 LP |
6 | |
7 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
8 | under the terms of the GNU Lesser General Public License as published by |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
ec863ba6 LP |
10 | (at your option) any later version. |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 15 | Lesser General Public License for more details. |
ec863ba6 | 16 | |
5430f7f2 | 17 | You should have received a copy of the GNU Lesser General Public License |
ec863ba6 LP |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
19 | ***/ | |
20 | ||
ec863ba6 | 21 | #include <errno.h> |
3f6fd1ba LP |
22 | #include <fcntl.h> |
23 | #include <getopt.h> | |
24 | #include <poll.h> | |
6af62124 | 25 | #include <signal.h> |
3f6fd1ba LP |
26 | #include <stdbool.h> |
27 | #include <stddef.h> | |
ec863ba6 | 28 | #include <string.h> |
3f6fd1ba | 29 | #include <sys/inotify.h> |
6af62124 | 30 | #include <sys/prctl.h> |
3f6fd1ba | 31 | #include <sys/signalfd.h> |
ec863ba6 | 32 | #include <sys/socket.h> |
6af62124 | 33 | #include <sys/wait.h> |
ec863ba6 | 34 | #include <sys/un.h> |
ec863ba6 | 35 | #include <unistd.h> |
ec863ba6 | 36 | |
b5efdb8a | 37 | #include "alloc-util.h" |
3f6fd1ba LP |
38 | #include "ask-password-api.h" |
39 | #include "conf-parser.h" | |
40 | #include "def.h" | |
a0956174 | 41 | #include "dirent-util.h" |
6af62124 | 42 | #include "exit-status.h" |
3ffd4af2 | 43 | #include "fd-util.h" |
6af62124 WF |
44 | #include "fileio.h" |
45 | #include "hashmap.h" | |
c004493c | 46 | #include "io-util.h" |
6af62124 | 47 | #include "macro.h" |
49e942b2 | 48 | #include "mkdir.h" |
9eb977db | 49 | #include "path-util.h" |
3f6fd1ba LP |
50 | #include "process-util.h" |
51 | #include "signal-util.h" | |
e5ebf783 | 52 | #include "socket-util.h" |
07630cea | 53 | #include "string-util.h" |
21bc923a | 54 | #include "strv.h" |
288a74cc | 55 | #include "terminal-util.h" |
3f6fd1ba LP |
56 | #include "util.h" |
57 | #include "utmp-wtmp.h" | |
ec863ba6 LP |
58 | |
59 | static enum { | |
60 | ACTION_LIST, | |
61 | ACTION_QUERY, | |
62 | ACTION_WATCH, | |
63 | ACTION_WALL | |
64 | } arg_action = ACTION_QUERY; | |
65 | ||
e5ebf783 | 66 | static bool arg_plymouth = false; |
0cf84693 | 67 | static bool arg_console = false; |
6af62124 | 68 | static const char *arg_device = NULL; |
e5ebf783 | 69 | |
21bc923a LP |
70 | static int ask_password_plymouth( |
71 | const char *message, | |
72 | usec_t until, | |
e287086b | 73 | AskPasswordFlags flags, |
21bc923a | 74 | const char *flag_file, |
e287086b | 75 | char ***ret) { |
21bc923a | 76 | |
fc2fffe7 | 77 | static const union sockaddr_union sa = PLYMOUTH_SOCKET; |
1d749d04 | 78 | _cleanup_close_ int fd = -1, notify = -1; |
1d749d04 | 79 | _cleanup_free_ char *packet = NULL; |
e5ebf783 LP |
80 | ssize_t k; |
81 | int r, n; | |
b92bea5d | 82 | struct pollfd pollfd[2] = {}; |
e5ebf783 LP |
83 | char buffer[LINE_MAX]; |
84 | size_t p = 0; | |
85 | enum { | |
86 | POLL_SOCKET, | |
87 | POLL_INOTIFY | |
88 | }; | |
89 | ||
e287086b | 90 | assert(ret); |
21bc923a | 91 | |
e5ebf783 | 92 | if (flag_file) { |
1d749d04 ZJS |
93 | notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK); |
94 | if (notify < 0) | |
95 | return -errno; | |
e5ebf783 | 96 | |
1d749d04 ZJS |
97 | r = inotify_add_watch(notify, flag_file, IN_ATTRIB); /* for the link count */ |
98 | if (r < 0) | |
99 | return -errno; | |
e5ebf783 LP |
100 | } |
101 | ||
1d749d04 ZJS |
102 | fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
103 | if (fd < 0) | |
104 | return -errno; | |
e5ebf783 | 105 | |
fc2fffe7 | 106 | r = connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)); |
4a62c710 | 107 | if (r < 0) |
00843602 | 108 | return -errno; |
e5ebf783 | 109 | |
e287086b | 110 | if (flags & ASK_PASSWORD_ACCEPT_CACHED) { |
21bc923a LP |
111 | packet = strdup("c"); |
112 | n = 1; | |
00843602 | 113 | } else if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0) |
7de80bfe | 114 | packet = NULL; |
1d749d04 | 115 | if (!packet) |
00843602 | 116 | return -ENOMEM; |
e5ebf783 | 117 | |
553acb7b ZJS |
118 | r = loop_write(fd, packet, n + 1, true); |
119 | if (r < 0) | |
120 | return r; | |
e5ebf783 | 121 | |
e5ebf783 LP |
122 | pollfd[POLL_SOCKET].fd = fd; |
123 | pollfd[POLL_SOCKET].events = POLLIN; | |
124 | pollfd[POLL_INOTIFY].fd = notify; | |
125 | pollfd[POLL_INOTIFY].events = POLLIN; | |
126 | ||
127 | for (;;) { | |
128 | int sleep_for = -1, j; | |
129 | ||
130 | if (until > 0) { | |
131 | usec_t y; | |
132 | ||
133 | y = now(CLOCK_MONOTONIC); | |
134 | ||
1602b008 LP |
135 | if (y > until) { |
136 | r = -ETIME; | |
137 | goto finish; | |
138 | } | |
e5ebf783 LP |
139 | |
140 | sleep_for = (int) ((until - y) / USEC_PER_MSEC); | |
141 | } | |
142 | ||
1602b008 LP |
143 | if (flag_file && access(flag_file, F_OK) < 0) { |
144 | r = -errno; | |
145 | goto finish; | |
146 | } | |
e5ebf783 | 147 | |
e287086b | 148 | j = poll(pollfd, notify >= 0 ? 2 : 1, sleep_for); |
1d749d04 | 149 | if (j < 0) { |
e5ebf783 LP |
150 | if (errno == EINTR) |
151 | continue; | |
152 | ||
1602b008 LP |
153 | r = -errno; |
154 | goto finish; | |
155 | } else if (j == 0) { | |
156 | r = -ETIME; | |
157 | goto finish; | |
158 | } | |
e5ebf783 | 159 | |
e287086b | 160 | if (notify >= 0 && pollfd[POLL_INOTIFY].revents != 0) |
e5ebf783 LP |
161 | flush_fd(notify); |
162 | ||
163 | if (pollfd[POLL_SOCKET].revents == 0) | |
164 | continue; | |
165 | ||
1d749d04 | 166 | k = read(fd, buffer + p, sizeof(buffer) - p); |
e287086b LP |
167 | if (k < 0) { |
168 | if (errno == EINTR || errno == EAGAIN) | |
169 | continue; | |
170 | ||
1602b008 LP |
171 | r = -errno; |
172 | goto finish; | |
173 | } else if (k == 0) { | |
174 | r = -EIO; | |
175 | goto finish; | |
176 | } | |
e5ebf783 LP |
177 | |
178 | p += k; | |
179 | ||
180 | if (p < 1) | |
181 | continue; | |
182 | ||
183 | if (buffer[0] == 5) { | |
21bc923a | 184 | |
e287086b | 185 | if (flags & ASK_PASSWORD_ACCEPT_CACHED) { |
21bc923a LP |
186 | /* Hmm, first try with cached |
187 | * passwords failed, so let's retry | |
188 | * with a normal password request */ | |
97b11eed | 189 | packet = mfree(packet); |
21bc923a | 190 | |
1602b008 LP |
191 | if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0) { |
192 | r = -ENOMEM; | |
193 | goto finish; | |
194 | } | |
21bc923a | 195 | |
553acb7b ZJS |
196 | r = loop_write(fd, packet, n+1, true); |
197 | if (r < 0) | |
1602b008 | 198 | goto finish; |
21bc923a | 199 | |
e287086b | 200 | flags &= ~ASK_PASSWORD_ACCEPT_CACHED; |
21bc923a LP |
201 | p = 0; |
202 | continue; | |
203 | } | |
204 | ||
e5ebf783 | 205 | /* No password, because UI not shown */ |
1602b008 LP |
206 | r = -ENOENT; |
207 | goto finish; | |
e5ebf783 | 208 | |
21bc923a | 209 | } else if (buffer[0] == 2 || buffer[0] == 9) { |
e5ebf783 | 210 | uint32_t size; |
21bc923a | 211 | char **l; |
e5ebf783 | 212 | |
4cf07da2 | 213 | /* One or more answers */ |
e5ebf783 LP |
214 | if (p < 5) |
215 | continue; | |
216 | ||
217 | memcpy(&size, buffer+1, sizeof(size)); | |
bb53abeb | 218 | size = le32toh(size); |
1602b008 LP |
219 | if (size + 5 > sizeof(buffer)) { |
220 | r = -EIO; | |
221 | goto finish; | |
222 | } | |
e5ebf783 LP |
223 | |
224 | if (p-5 < size) | |
225 | continue; | |
226 | ||
1d749d04 | 227 | l = strv_parse_nulstr(buffer + 5, size); |
1602b008 LP |
228 | if (!l) { |
229 | r = -ENOMEM; | |
230 | goto finish; | |
231 | } | |
e5ebf783 | 232 | |
e287086b | 233 | *ret = l; |
e5ebf783 | 234 | break; |
21bc923a | 235 | |
1602b008 | 236 | } else { |
e5ebf783 | 237 | /* Unknown packet */ |
1602b008 LP |
238 | r = -EIO; |
239 | goto finish; | |
240 | } | |
e5ebf783 LP |
241 | } |
242 | ||
1602b008 LP |
243 | r = 0; |
244 | ||
245 | finish: | |
2d26d8e0 | 246 | explicit_bzero(buffer, sizeof(buffer)); |
1602b008 | 247 | return r; |
e5ebf783 LP |
248 | } |
249 | ||
bbada6d7 JAS |
250 | static int send_passwords(const char *socket_name, char **passwords) { |
251 | _cleanup_free_ char *packet = NULL; | |
252 | _cleanup_close_ int socket_fd = -1; | |
253 | union sockaddr_union sa = { .un.sun_family = AF_UNIX }; | |
254 | size_t packet_length = 1; | |
255 | char **p, *d; | |
256 | int r; | |
257 | ||
258 | assert(socket_name); | |
259 | ||
260 | STRV_FOREACH(p, passwords) | |
261 | packet_length += strlen(*p) + 1; | |
262 | ||
263 | packet = new(char, packet_length); | |
264 | if (!packet) | |
265 | return -ENOMEM; | |
266 | ||
267 | packet[0] = '+'; | |
268 | ||
269 | d = packet + 1; | |
270 | STRV_FOREACH(p, passwords) | |
271 | d = stpcpy(d, *p) + 1; | |
272 | ||
273 | socket_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0); | |
274 | if (socket_fd < 0) { | |
275 | r = log_debug_errno(errno, "socket(): %m"); | |
276 | goto finish; | |
277 | } | |
278 | ||
279 | strncpy(sa.un.sun_path, socket_name, sizeof(sa.un.sun_path)); | |
280 | ||
fc2fffe7 | 281 | r = sendto(socket_fd, packet, packet_length, MSG_NOSIGNAL, &sa.sa, SOCKADDR_UN_LEN(sa.un)); |
bbada6d7 JAS |
282 | if (r < 0) |
283 | r = log_debug_errno(errno, "sendto(): %m"); | |
284 | ||
285 | finish: | |
2d26d8e0 | 286 | explicit_bzero(packet, packet_length); |
bbada6d7 JAS |
287 | return r; |
288 | } | |
289 | ||
0ddf1d3a | 290 | static int parse_password(const char *filename, char **wall) { |
bbada6d7 | 291 | _cleanup_free_ char *socket_name = NULL, *message = NULL; |
1602b008 | 292 | bool accept_cached = false, echo = false; |
ec863ba6 LP |
293 | uint64_t not_after = 0; |
294 | unsigned pid = 0; | |
ec863ba6 | 295 | |
f975e971 LP |
296 | const ConfigTableItem items[] = { |
297 | { "Ask", "Socket", config_parse_string, 0, &socket_name }, | |
298 | { "Ask", "NotAfter", config_parse_uint64, 0, ¬_after }, | |
299 | { "Ask", "Message", config_parse_string, 0, &message }, | |
300 | { "Ask", "PID", config_parse_unsigned, 0, &pid }, | |
301 | { "Ask", "AcceptCached", config_parse_bool, 0, &accept_cached }, | |
64845bdc | 302 | { "Ask", "Echo", config_parse_bool, 0, &echo }, |
1d749d04 | 303 | {} |
ec863ba6 LP |
304 | }; |
305 | ||
ec863ba6 | 306 | int r; |
ec863ba6 LP |
307 | |
308 | assert(filename); | |
309 | ||
36f822c4 ZJS |
310 | r = config_parse(NULL, filename, NULL, |
311 | NULL, | |
312 | config_item_table_lookup, items, | |
313 | true, false, true, NULL); | |
314 | if (r < 0) | |
315 | return r; | |
ec863ba6 | 316 | |
7dcda352 | 317 | if (!socket_name) { |
ec863ba6 | 318 | log_error("Invalid password file %s", filename); |
e46eab86 | 319 | return -EBADMSG; |
ec863ba6 LP |
320 | } |
321 | ||
e46eab86 ZJS |
322 | if (not_after > 0 && now(CLOCK_MONOTONIC) > not_after) |
323 | return 0; | |
ec863ba6 | 324 | |
e46eab86 ZJS |
325 | if (pid > 0 && !pid_is_alive(pid)) |
326 | return 0; | |
ded80335 | 327 | |
ec863ba6 LP |
328 | if (arg_action == ACTION_LIST) |
329 | printf("'%s' (PID %u)\n", message, pid); | |
e46eab86 | 330 | |
ec863ba6 | 331 | else if (arg_action == ACTION_WALL) { |
0ddf1d3a | 332 | char *_wall; |
ec863ba6 | 333 | |
0ddf1d3a LP |
334 | if (asprintf(&_wall, |
335 | "%s%sPassword entry required for \'%s\' (PID %u).\r\n" | |
9d3e691e | 336 | "Please enter password with the systemd-tty-ask-password-agent tool!", |
5cfee414 | 337 | strempty(*wall), |
0ddf1d3a | 338 | *wall ? "\r\n\r\n" : "", |
ec863ba6 | 339 | message, |
e46eab86 ZJS |
340 | pid) < 0) |
341 | return log_oom(); | |
ec863ba6 | 342 | |
0ddf1d3a LP |
343 | free(*wall); |
344 | *wall = _wall; | |
e46eab86 | 345 | |
ec863ba6 | 346 | } else { |
bbada6d7 | 347 | _cleanup_strv_free_erase_ char **passwords = NULL; |
ec863ba6 LP |
348 | |
349 | assert(arg_action == ACTION_QUERY || | |
350 | arg_action == ACTION_WATCH); | |
351 | ||
352 | if (access(socket_name, W_OK) < 0) { | |
ec863ba6 LP |
353 | if (arg_action == ACTION_QUERY) |
354 | log_info("Not querying '%s' (PID %u), lacking privileges.", message, pid); | |
355 | ||
e46eab86 | 356 | return 0; |
ec863ba6 LP |
357 | } |
358 | ||
bbada6d7 | 359 | if (arg_plymouth) |
e287086b | 360 | r = ask_password_plymouth(message, not_after, accept_cached ? ASK_PASSWORD_ACCEPT_CACHED : 0, filename, &passwords); |
bbada6d7 JAS |
361 | else { |
362 | char *password = NULL; | |
00843602 | 363 | int tty_fd = -1; |
0cf84693 | 364 | |
e46eab86 | 365 | if (arg_console) { |
6af62124 WF |
366 | const char *con = arg_device ? arg_device : "/dev/console"; |
367 | ||
368 | tty_fd = acquire_terminal(con, false, false, false, USEC_INFINITY); | |
e46eab86 | 369 | if (tty_fd < 0) |
00843602 | 370 | return log_error_errno(tty_fd, "Failed to acquire /dev/console: %m"); |
3d18b167 LP |
371 | |
372 | r = reset_terminal_fd(tty_fd, true); | |
373 | if (r < 0) | |
374 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
e46eab86 | 375 | } |
0cf84693 | 376 | |
e287086b | 377 | r = ask_password_tty(message, NULL, not_after, echo ? ASK_PASSWORD_ECHO : 0, filename, &password); |
e5ebf783 | 378 | |
0cf84693 | 379 | if (arg_console) { |
00843602 | 380 | tty_fd = safe_close(tty_fd); |
0cf84693 LP |
381 | release_terminal(); |
382 | } | |
21bc923a | 383 | |
bbada6d7 JAS |
384 | if (r >= 0) |
385 | r = strv_push(&passwords, password); | |
0cf84693 | 386 | |
bbada6d7 JAS |
387 | if (r < 0) |
388 | string_free_erase(password); | |
1602b008 | 389 | } |
ec863ba6 | 390 | |
bbada6d7 JAS |
391 | /* If the query went away, that's OK */ |
392 | if (IN_SET(r, -ETIME, -ENOENT)) | |
393 | return 0; | |
ec863ba6 | 394 | |
bbada6d7 JAS |
395 | if (r < 0) |
396 | return log_error_errno(r, "Failed to query password: %m"); | |
ec863ba6 | 397 | |
bbada6d7 | 398 | r = send_passwords(socket_name, passwords); |
00843602 | 399 | if (r < 0) |
bbada6d7 | 400 | return log_error_errno(r, "Failed to send: %m"); |
ec863ba6 LP |
401 | } |
402 | ||
e46eab86 | 403 | return 0; |
ec863ba6 LP |
404 | } |
405 | ||
0cf84693 | 406 | static int wall_tty_block(void) { |
1d749d04 | 407 | _cleanup_free_ char *p = NULL; |
fc116c6a | 408 | dev_t devnr; |
00843602 | 409 | int fd, r; |
7af53310 | 410 | |
4d6d6518 | 411 | r = get_ctty_devnr(0, &devnr); |
e287086b LP |
412 | if (r == -ENXIO) /* We have no controlling tty */ |
413 | return -ENOTTY; | |
4d6d6518 | 414 | if (r < 0) |
00843602 | 415 | return log_error_errno(r, "Failed to get controlling TTY: %m"); |
7af53310 | 416 | |
2b583ce6 | 417 | if (asprintf(&p, "/run/systemd/ask-password-block/%u:%u", major(devnr), minor(devnr)) < 0) |
00843602 | 418 | return log_oom(); |
7af53310 | 419 | |
d2e54fae | 420 | mkdir_parents_label(p, 0700); |
7af53310 LP |
421 | mkfifo(p, 0600); |
422 | ||
423 | fd = open(p, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
7af53310 | 424 | if (fd < 0) |
2ee4e222 | 425 | return log_debug_errno(errno, "Failed to open %s: %m", p); |
7af53310 LP |
426 | |
427 | return fd; | |
428 | } | |
429 | ||
99f710dd | 430 | static bool wall_tty_match(const char *path, void *userdata) { |
1d749d04 | 431 | _cleanup_free_ char *p = NULL; |
00843602 LP |
432 | _cleanup_close_ int fd = -1; |
433 | struct stat st; | |
fc116c6a | 434 | |
1d749d04 | 435 | if (!path_is_absolute(path)) |
63c372cb | 436 | path = strjoina("/dev/", path); |
fc116c6a | 437 | |
00843602 LP |
438 | if (lstat(path, &st) < 0) { |
439 | log_debug_errno(errno, "Failed to stat %s: %m", path); | |
fc116c6a | 440 | return true; |
00843602 | 441 | } |
fc116c6a | 442 | |
00843602 LP |
443 | if (!S_ISCHR(st.st_mode)) { |
444 | log_debug("%s is not a character device.", path); | |
fc116c6a | 445 | return true; |
00843602 | 446 | } |
7af53310 LP |
447 | |
448 | /* We use named pipes to ensure that wall messages suggesting | |
449 | * password entry are not printed over password prompts | |
450 | * already shown. We use the fact here that opening a pipe in | |
451 | * non-blocking mode for write-only will succeed only if | |
452 | * there's some writer behind it. Using pipes has the | |
453 | * advantage that the block will automatically go away if the | |
454 | * process dies. */ | |
455 | ||
00843602 LP |
456 | if (asprintf(&p, "/run/systemd/ask-password-block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0) { |
457 | log_oom(); | |
7af53310 | 458 | return true; |
00843602 | 459 | } |
7af53310 LP |
460 | |
461 | fd = open(p, O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
00843602 LP |
462 | if (fd < 0) { |
463 | log_debug_errno(errno, "Failed top open the wall pipe: %m"); | |
464 | return 1; | |
465 | } | |
7af53310 LP |
466 | |
467 | /* What, we managed to open the pipe? Then this tty is filtered. */ | |
00843602 | 468 | return 0; |
7af53310 LP |
469 | } |
470 | ||
ec863ba6 | 471 | static int show_passwords(void) { |
1d749d04 | 472 | _cleanup_closedir_ DIR *d; |
ec863ba6 LP |
473 | struct dirent *de; |
474 | int r = 0; | |
475 | ||
1d749d04 ZJS |
476 | d = opendir("/run/systemd/ask-password"); |
477 | if (!d) { | |
ec863ba6 LP |
478 | if (errno == ENOENT) |
479 | return 0; | |
480 | ||
ad71eee5 | 481 | return log_error_errno(errno, "Failed to open /run/systemd/ask-password: %m"); |
ec863ba6 LP |
482 | } |
483 | ||
00843602 | 484 | FOREACH_DIRENT_ALL(de, d, return log_error_errno(errno, "Failed to read directory: %m")) { |
1d749d04 | 485 | _cleanup_free_ char *p = NULL, *wall = NULL; |
ec863ba6 LP |
486 | int q; |
487 | ||
1a6f4df6 LP |
488 | /* We only support /dev on tmpfs, hence we can rely on |
489 | * d_type to be reliable */ | |
490 | ||
ec863ba6 LP |
491 | if (de->d_type != DT_REG) |
492 | continue; | |
493 | ||
55cdd057 | 494 | if (hidden_or_backup_file(de->d_name)) |
ec863ba6 LP |
495 | continue; |
496 | ||
497 | if (!startswith(de->d_name, "ask.")) | |
498 | continue; | |
499 | ||
1d749d04 ZJS |
500 | p = strappend("/run/systemd/ask-password/", de->d_name); |
501 | if (!p) | |
502 | return log_oom(); | |
ec863ba6 | 503 | |
1d749d04 ZJS |
504 | q = parse_password(p, &wall); |
505 | if (q < 0 && r == 0) | |
ec863ba6 LP |
506 | r = q; |
507 | ||
1d749d04 | 508 | if (wall) |
00843602 | 509 | (void) utmp_wall(wall, NULL, NULL, wall_tty_match, NULL); |
ec863ba6 LP |
510 | } |
511 | ||
ec863ba6 LP |
512 | return r; |
513 | } | |
514 | ||
515 | static int watch_passwords(void) { | |
b9ba604e LP |
516 | enum { |
517 | FD_INOTIFY, | |
518 | FD_SIGNAL, | |
519 | _FD_MAX | |
520 | }; | |
521 | ||
1d749d04 | 522 | _cleanup_close_ int notify = -1, signal_fd = -1, tty_block_fd = -1; |
b92bea5d | 523 | struct pollfd pollfd[_FD_MAX] = {}; |
b9ba604e | 524 | sigset_t mask; |
ec863ba6 LP |
525 | int r; |
526 | ||
0cf84693 | 527 | tty_block_fd = wall_tty_block(); |
7af53310 | 528 | |
00843602 | 529 | (void) mkdir_p_label("/run/systemd/ask-password", 0755); |
ec863ba6 | 530 | |
1d749d04 ZJS |
531 | notify = inotify_init1(IN_CLOEXEC); |
532 | if (notify < 0) | |
00843602 | 533 | return log_error_errno(errno, "Failed to allocate directory watch: %m"); |
ec863ba6 | 534 | |
1d749d04 | 535 | if (inotify_add_watch(notify, "/run/systemd/ask-password", IN_CLOSE_WRITE|IN_MOVED_TO) < 0) |
00843602 | 536 | return log_error_errno(errno, "Failed to add /run/systemd/ask-password to directory watch: %m"); |
ec863ba6 | 537 | |
72c0a2c2 LP |
538 | assert_se(sigemptyset(&mask) >= 0); |
539 | assert_se(sigset_add_many(&mask, SIGINT, SIGTERM, -1) >= 0); | |
540 | assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) >= 0); | |
b9ba604e | 541 | |
1d749d04 ZJS |
542 | signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); |
543 | if (signal_fd < 0) | |
00843602 | 544 | return log_error_errno(errno, "Failed to allocate signal file descriptor: %m"); |
b9ba604e | 545 | |
b9ba604e LP |
546 | pollfd[FD_INOTIFY].fd = notify; |
547 | pollfd[FD_INOTIFY].events = POLLIN; | |
548 | pollfd[FD_SIGNAL].fd = signal_fd; | |
549 | pollfd[FD_SIGNAL].events = POLLIN; | |
ec863ba6 LP |
550 | |
551 | for (;;) { | |
1d749d04 ZJS |
552 | r = show_passwords(); |
553 | if (r < 0) | |
da927ba9 | 554 | log_error_errno(r, "Failed to show password: %m"); |
ec863ba6 | 555 | |
b9ba604e | 556 | if (poll(pollfd, _FD_MAX, -1) < 0) { |
ec863ba6 LP |
557 | if (errno == EINTR) |
558 | continue; | |
559 | ||
1d749d04 | 560 | return -errno; |
ec863ba6 LP |
561 | } |
562 | ||
b9ba604e | 563 | if (pollfd[FD_INOTIFY].revents != 0) |
00843602 | 564 | (void) flush_fd(notify); |
b9ba604e LP |
565 | |
566 | if (pollfd[FD_SIGNAL].revents != 0) | |
567 | break; | |
ec863ba6 LP |
568 | } |
569 | ||
1d749d04 | 570 | return 0; |
ec863ba6 LP |
571 | } |
572 | ||
601185b4 | 573 | static void help(void) { |
ec863ba6 LP |
574 | printf("%s [OPTIONS...]\n\n" |
575 | "Process system password requests.\n\n" | |
e5ebf783 | 576 | " -h --help Show this help\n" |
c52f663b | 577 | " --version Show package version\n" |
e5ebf783 LP |
578 | " --list Show pending password requests\n" |
579 | " --query Process pending password requests\n" | |
35b8ca3a HH |
580 | " --watch Continuously process password requests\n" |
581 | " --wall Continuously forward password requests to wall\n" | |
0cf84693 LP |
582 | " --plymouth Ask question with Plymouth instead of on TTY\n" |
583 | " --console Ask question on /dev/console instead of current TTY\n", | |
ec863ba6 | 584 | program_invocation_short_name); |
ec863ba6 LP |
585 | } |
586 | ||
587 | static int parse_argv(int argc, char *argv[]) { | |
588 | ||
589 | enum { | |
590 | ARG_LIST = 0x100, | |
591 | ARG_QUERY, | |
592 | ARG_WATCH, | |
593 | ARG_WALL, | |
0cf84693 | 594 | ARG_PLYMOUTH, |
c52f663b LP |
595 | ARG_CONSOLE, |
596 | ARG_VERSION | |
ec863ba6 LP |
597 | }; |
598 | ||
599 | static const struct option options[] = { | |
6af62124 WF |
600 | { "help", no_argument, NULL, 'h' }, |
601 | { "version", no_argument, NULL, ARG_VERSION }, | |
602 | { "list", no_argument, NULL, ARG_LIST }, | |
603 | { "query", no_argument, NULL, ARG_QUERY }, | |
604 | { "watch", no_argument, NULL, ARG_WATCH }, | |
605 | { "wall", no_argument, NULL, ARG_WALL }, | |
606 | { "plymouth", no_argument, NULL, ARG_PLYMOUTH }, | |
607 | { "console", optional_argument, NULL, ARG_CONSOLE }, | |
eb9da376 | 608 | {} |
ec863ba6 LP |
609 | }; |
610 | ||
611 | int c; | |
612 | ||
613 | assert(argc >= 0); | |
614 | assert(argv); | |
615 | ||
601185b4 | 616 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) |
ec863ba6 LP |
617 | |
618 | switch (c) { | |
619 | ||
620 | case 'h': | |
601185b4 ZJS |
621 | help(); |
622 | return 0; | |
ec863ba6 | 623 | |
c52f663b | 624 | case ARG_VERSION: |
3f6fd1ba | 625 | return version(); |
c52f663b | 626 | |
ec863ba6 LP |
627 | case ARG_LIST: |
628 | arg_action = ACTION_LIST; | |
629 | break; | |
630 | ||
631 | case ARG_QUERY: | |
632 | arg_action = ACTION_QUERY; | |
633 | break; | |
634 | ||
635 | case ARG_WATCH: | |
636 | arg_action = ACTION_WATCH; | |
637 | break; | |
638 | ||
639 | case ARG_WALL: | |
640 | arg_action = ACTION_WALL; | |
641 | break; | |
642 | ||
e5ebf783 LP |
643 | case ARG_PLYMOUTH: |
644 | arg_plymouth = true; | |
645 | break; | |
646 | ||
0cf84693 LP |
647 | case ARG_CONSOLE: |
648 | arg_console = true; | |
6af62124 WF |
649 | if (optarg) { |
650 | ||
651 | if (isempty(optarg)) { | |
652 | log_error("Empty console device path is not allowed."); | |
653 | return -EINVAL; | |
654 | } | |
655 | ||
656 | arg_device = optarg; | |
657 | } | |
0cf84693 LP |
658 | break; |
659 | ||
ec863ba6 LP |
660 | case '?': |
661 | return -EINVAL; | |
662 | ||
663 | default: | |
eb9da376 | 664 | assert_not_reached("Unhandled option"); |
ec863ba6 | 665 | } |
ec863ba6 LP |
666 | |
667 | if (optind != argc) { | |
601185b4 | 668 | log_error("%s takes no arguments.", program_invocation_short_name); |
ec863ba6 LP |
669 | return -EINVAL; |
670 | } | |
671 | ||
6af62124 WF |
672 | if (arg_plymouth || arg_console) { |
673 | ||
674 | if (!IN_SET(arg_action, ACTION_QUERY, ACTION_WATCH)) { | |
675 | log_error("Options --query and --watch conflict."); | |
676 | return -EINVAL; | |
677 | } | |
678 | ||
679 | if (arg_plymouth && arg_console) { | |
680 | log_error("Options --plymouth and --console conflict."); | |
681 | return -EINVAL; | |
682 | } | |
683 | } | |
684 | ||
ec863ba6 LP |
685 | return 1; |
686 | } | |
687 | ||
6af62124 WF |
688 | /* |
689 | * To be able to ask on all terminal devices of /dev/console | |
690 | * the devices are collected. If more than one device is found, | |
691 | * then on each of the terminals a inquiring task is forked. | |
692 | * Every task has its own session and its own controlling terminal. | |
693 | * If one of the tasks does handle a password, the remaining tasks | |
694 | * will be terminated. | |
695 | */ | |
696 | static int ask_on_this_console(const char *tty, pid_t *pid, int argc, char *argv[]) { | |
697 | struct sigaction sig = { | |
698 | .sa_handler = nop_signal_handler, | |
699 | .sa_flags = SA_NOCLDSTOP | SA_RESTART, | |
700 | }; | |
701 | ||
702 | assert_se(sigprocmask_many(SIG_UNBLOCK, NULL, SIGHUP, SIGCHLD, -1) >= 0); | |
703 | ||
704 | assert_se(sigemptyset(&sig.sa_mask) >= 0); | |
705 | assert_se(sigaction(SIGCHLD, &sig, NULL) >= 0); | |
706 | ||
707 | sig.sa_handler = SIG_DFL; | |
708 | assert_se(sigaction(SIGHUP, &sig, NULL) >= 0); | |
709 | ||
710 | *pid = fork(); | |
711 | if (*pid < 0) | |
712 | return log_error_errno(errno, "Failed to fork process: %m"); | |
713 | ||
714 | if (*pid == 0) { | |
715 | int ac; | |
716 | ||
717 | assert_se(prctl(PR_SET_PDEATHSIG, SIGHUP) >= 0); | |
718 | ||
719 | reset_signal_mask(); | |
720 | reset_all_signal_handlers(); | |
721 | ||
722 | for (ac = 0; ac < argc; ac++) { | |
723 | if (streq(argv[ac], "--console")) { | |
724 | argv[ac] = strjoina("--console=", tty, NULL); | |
725 | break; | |
726 | } | |
727 | } | |
728 | ||
729 | assert(ac < argc); | |
730 | ||
731 | execv(SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, argv); | |
732 | _exit(EXIT_FAILURE); | |
733 | } | |
734 | return 0; | |
735 | } | |
736 | ||
737 | static void terminate_agents(Set *pids) { | |
738 | struct timespec ts; | |
739 | siginfo_t status = {}; | |
740 | sigset_t set; | |
741 | Iterator i; | |
742 | void *p; | |
743 | int r, signum; | |
744 | ||
745 | /* | |
746 | * Request termination of the remaining processes as those | |
747 | * are not required anymore. | |
748 | */ | |
749 | SET_FOREACH(p, pids, i) | |
750 | (void) kill(PTR_TO_PID(p), SIGTERM); | |
751 | ||
752 | /* | |
753 | * Collect the processes which have go away. | |
754 | */ | |
755 | assert_se(sigemptyset(&set) >= 0); | |
756 | assert_se(sigaddset(&set, SIGCHLD) >= 0); | |
757 | timespec_store(&ts, 50 * USEC_PER_MSEC); | |
758 | ||
759 | while (!set_isempty(pids)) { | |
760 | ||
761 | zero(status); | |
762 | r = waitid(P_ALL, 0, &status, WEXITED|WNOHANG); | |
763 | if (r < 0 && errno == EINTR) | |
764 | continue; | |
765 | ||
766 | if (r == 0 && status.si_pid > 0) { | |
767 | set_remove(pids, PID_TO_PTR(status.si_pid)); | |
768 | continue; | |
769 | } | |
770 | ||
771 | signum = sigtimedwait(&set, NULL, &ts); | |
772 | if (signum < 0) { | |
773 | if (errno != EAGAIN) | |
774 | log_error_errno(errno, "sigtimedwait() failed: %m"); | |
775 | break; | |
776 | } | |
777 | assert(signum == SIGCHLD); | |
778 | } | |
779 | ||
780 | /* | |
781 | * Kill hanging processes. | |
782 | */ | |
783 | SET_FOREACH(p, pids, i) { | |
784 | log_warning("Failed to terminate child %d, killing it", PTR_TO_PID(p)); | |
785 | (void) kill(PTR_TO_PID(p), SIGKILL); | |
786 | } | |
787 | } | |
788 | ||
789 | static int ask_on_consoles(int argc, char *argv[]) { | |
790 | _cleanup_set_free_ Set *pids = NULL; | |
791 | _cleanup_strv_free_ char **consoles = NULL; | |
792 | siginfo_t status = {}; | |
793 | char **tty; | |
794 | pid_t pid; | |
795 | int r; | |
796 | ||
797 | r = get_kernel_consoles(&consoles); | |
798 | if (r < 0) | |
799 | return log_error_errno(r, "Failed to determine devices of /dev/console: %m"); | |
800 | ||
801 | pids = set_new(NULL); | |
802 | if (!pids) | |
803 | return log_oom(); | |
804 | ||
805 | /* Start an agent on each console. */ | |
806 | STRV_FOREACH(tty, consoles) { | |
807 | r = ask_on_this_console(*tty, &pid, argc, argv); | |
808 | if (r < 0) | |
809 | return r; | |
810 | ||
811 | if (set_put(pids, PID_TO_PTR(pid)) < 0) | |
812 | return log_oom(); | |
813 | } | |
814 | ||
815 | /* Wait for an agent to exit. */ | |
816 | for (;;) { | |
817 | zero(status); | |
818 | ||
819 | if (waitid(P_ALL, 0, &status, WEXITED) < 0) { | |
820 | if (errno == EINTR) | |
821 | continue; | |
822 | ||
823 | return log_error_errno(errno, "waitid() failed: %m"); | |
824 | } | |
825 | ||
826 | set_remove(pids, PID_TO_PTR(status.si_pid)); | |
827 | break; | |
828 | } | |
829 | ||
1f0958f6 | 830 | if (!is_clean_exit(status.si_code, status.si_status, EXIT_CLEAN_DAEMON, NULL)) |
6af62124 WF |
831 | log_error("Password agent failed with: %d", status.si_status); |
832 | ||
833 | terminate_agents(pids); | |
834 | return 0; | |
835 | } | |
836 | ||
ec863ba6 LP |
837 | int main(int argc, char *argv[]) { |
838 | int r; | |
839 | ||
4b261568 | 840 | log_set_target(LOG_TARGET_AUTO); |
ec863ba6 LP |
841 | log_parse_environment(); |
842 | log_open(); | |
843 | ||
4c12626c LP |
844 | umask(0022); |
845 | ||
1d749d04 ZJS |
846 | r = parse_argv(argc, argv); |
847 | if (r <= 0) | |
ec863ba6 LP |
848 | goto finish; |
849 | ||
6af62124 WF |
850 | if (arg_console && !arg_device) |
851 | /* | |
852 | * Spawn for each console device a separate process. | |
853 | */ | |
854 | r = ask_on_consoles(argc, argv); | |
855 | else { | |
856 | ||
857 | if (arg_device) { | |
858 | /* | |
859 | * Later on, a controlling terminal will be acquired, | |
860 | * therefore the current process has to become a session | |
861 | * leader and should not have a controlling terminal already. | |
862 | */ | |
863 | (void) setsid(); | |
864 | (void) release_terminal(); | |
865 | } | |
0cf84693 | 866 | |
6af62124 WF |
867 | if (IN_SET(arg_action, ACTION_WATCH, ACTION_WALL)) |
868 | r = watch_passwords(); | |
869 | else | |
870 | r = show_passwords(); | |
871 | } | |
96707269 | 872 | |
ec863ba6 LP |
873 | finish: |
874 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
875 | } |