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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> |
3f6fd1ba | 14 | #include <sys/inotify.h> |
6af62124 | 15 | #include <sys/prctl.h> |
3f6fd1ba | 16 | #include <sys/signalfd.h> |
ec863ba6 | 17 | #include <sys/socket.h> |
6af62124 | 18 | #include <sys/wait.h> |
ec863ba6 | 19 | #include <sys/un.h> |
ec863ba6 | 20 | #include <unistd.h> |
ec863ba6 | 21 | |
b5efdb8a | 22 | #include "alloc-util.h" |
3f6fd1ba LP |
23 | #include "ask-password-api.h" |
24 | #include "conf-parser.h" | |
25 | #include "def.h" | |
a0956174 | 26 | #include "dirent-util.h" |
6af62124 | 27 | #include "exit-status.h" |
3ffd4af2 | 28 | #include "fd-util.h" |
6af62124 WF |
29 | #include "fileio.h" |
30 | #include "hashmap.h" | |
c004493c | 31 | #include "io-util.h" |
6af62124 | 32 | #include "macro.h" |
5e332028 | 33 | #include "main-func.h" |
49e942b2 | 34 | #include "mkdir.h" |
9eb977db | 35 | #include "path-util.h" |
294bf0c3 | 36 | #include "pretty-print.h" |
3f6fd1ba LP |
37 | #include "process-util.h" |
38 | #include "signal-util.h" | |
e5ebf783 | 39 | #include "socket-util.h" |
07630cea | 40 | #include "string-util.h" |
21bc923a | 41 | #include "strv.h" |
288a74cc | 42 | #include "terminal-util.h" |
3f6fd1ba LP |
43 | #include "util.h" |
44 | #include "utmp-wtmp.h" | |
ec863ba6 LP |
45 | |
46 | static enum { | |
47 | ACTION_LIST, | |
48 | ACTION_QUERY, | |
49 | ACTION_WATCH, | |
50 | ACTION_WALL | |
51 | } arg_action = ACTION_QUERY; | |
52 | ||
e5ebf783 | 53 | static bool arg_plymouth = false; |
0cf84693 | 54 | static bool arg_console = false; |
6af62124 | 55 | static const char *arg_device = NULL; |
e5ebf783 | 56 | |
21bc923a LP |
57 | static int ask_password_plymouth( |
58 | const char *message, | |
59 | usec_t until, | |
e287086b | 60 | AskPasswordFlags flags, |
21bc923a | 61 | const char *flag_file, |
e287086b | 62 | char ***ret) { |
21bc923a | 63 | |
fc2fffe7 | 64 | static const union sockaddr_union sa = PLYMOUTH_SOCKET; |
1d749d04 | 65 | _cleanup_close_ int fd = -1, notify = -1; |
1d749d04 | 66 | _cleanup_free_ char *packet = NULL; |
e5ebf783 LP |
67 | ssize_t k; |
68 | int r, n; | |
b92bea5d | 69 | struct pollfd pollfd[2] = {}; |
e5ebf783 LP |
70 | char buffer[LINE_MAX]; |
71 | size_t p = 0; | |
72 | enum { | |
73 | POLL_SOCKET, | |
74 | POLL_INOTIFY | |
75 | }; | |
76 | ||
e287086b | 77 | assert(ret); |
21bc923a | 78 | |
e5ebf783 | 79 | if (flag_file) { |
1d749d04 ZJS |
80 | notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK); |
81 | if (notify < 0) | |
82 | return -errno; | |
e5ebf783 | 83 | |
1d749d04 ZJS |
84 | r = inotify_add_watch(notify, flag_file, IN_ATTRIB); /* for the link count */ |
85 | if (r < 0) | |
86 | return -errno; | |
e5ebf783 LP |
87 | } |
88 | ||
1d749d04 ZJS |
89 | fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
90 | if (fd < 0) | |
91 | return -errno; | |
e5ebf783 | 92 | |
fc2fffe7 | 93 | r = connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)); |
4a62c710 | 94 | if (r < 0) |
00843602 | 95 | return -errno; |
e5ebf783 | 96 | |
e287086b | 97 | if (flags & ASK_PASSWORD_ACCEPT_CACHED) { |
21bc923a LP |
98 | packet = strdup("c"); |
99 | n = 1; | |
00843602 | 100 | } else if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0) |
7de80bfe | 101 | packet = NULL; |
1d749d04 | 102 | if (!packet) |
00843602 | 103 | return -ENOMEM; |
e5ebf783 | 104 | |
553acb7b ZJS |
105 | r = loop_write(fd, packet, n + 1, true); |
106 | if (r < 0) | |
107 | return r; | |
e5ebf783 | 108 | |
e5ebf783 LP |
109 | pollfd[POLL_SOCKET].fd = fd; |
110 | pollfd[POLL_SOCKET].events = POLLIN; | |
111 | pollfd[POLL_INOTIFY].fd = notify; | |
112 | pollfd[POLL_INOTIFY].events = POLLIN; | |
113 | ||
114 | for (;;) { | |
115 | int sleep_for = -1, j; | |
116 | ||
117 | if (until > 0) { | |
118 | usec_t y; | |
119 | ||
120 | y = now(CLOCK_MONOTONIC); | |
121 | ||
1602b008 LP |
122 | if (y > until) { |
123 | r = -ETIME; | |
124 | goto finish; | |
125 | } | |
e5ebf783 LP |
126 | |
127 | sleep_for = (int) ((until - y) / USEC_PER_MSEC); | |
128 | } | |
129 | ||
1602b008 LP |
130 | if (flag_file && access(flag_file, F_OK) < 0) { |
131 | r = -errno; | |
132 | goto finish; | |
133 | } | |
e5ebf783 | 134 | |
e287086b | 135 | j = poll(pollfd, notify >= 0 ? 2 : 1, sleep_for); |
1d749d04 | 136 | if (j < 0) { |
e5ebf783 LP |
137 | if (errno == EINTR) |
138 | continue; | |
139 | ||
1602b008 LP |
140 | r = -errno; |
141 | goto finish; | |
142 | } else if (j == 0) { | |
143 | r = -ETIME; | |
144 | goto finish; | |
145 | } | |
e5ebf783 | 146 | |
e287086b | 147 | if (notify >= 0 && pollfd[POLL_INOTIFY].revents != 0) |
665dfe93 | 148 | (void) flush_fd(notify); |
e5ebf783 LP |
149 | |
150 | if (pollfd[POLL_SOCKET].revents == 0) | |
151 | continue; | |
152 | ||
1d749d04 | 153 | k = read(fd, buffer + p, sizeof(buffer) - p); |
e287086b | 154 | if (k < 0) { |
3742095b | 155 | if (IN_SET(errno, EINTR, EAGAIN)) |
e287086b LP |
156 | continue; |
157 | ||
1602b008 LP |
158 | r = -errno; |
159 | goto finish; | |
160 | } else if (k == 0) { | |
161 | r = -EIO; | |
162 | goto finish; | |
163 | } | |
e5ebf783 LP |
164 | |
165 | p += k; | |
166 | ||
167 | if (p < 1) | |
168 | continue; | |
169 | ||
170 | if (buffer[0] == 5) { | |
21bc923a | 171 | |
e287086b | 172 | if (flags & ASK_PASSWORD_ACCEPT_CACHED) { |
21bc923a LP |
173 | /* Hmm, first try with cached |
174 | * passwords failed, so let's retry | |
175 | * with a normal password request */ | |
97b11eed | 176 | packet = mfree(packet); |
21bc923a | 177 | |
1602b008 LP |
178 | if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0) { |
179 | r = -ENOMEM; | |
180 | goto finish; | |
181 | } | |
21bc923a | 182 | |
553acb7b ZJS |
183 | r = loop_write(fd, packet, n+1, true); |
184 | if (r < 0) | |
1602b008 | 185 | goto finish; |
21bc923a | 186 | |
e287086b | 187 | flags &= ~ASK_PASSWORD_ACCEPT_CACHED; |
21bc923a LP |
188 | p = 0; |
189 | continue; | |
190 | } | |
191 | ||
e5ebf783 | 192 | /* No password, because UI not shown */ |
1602b008 LP |
193 | r = -ENOENT; |
194 | goto finish; | |
e5ebf783 | 195 | |
4c701096 | 196 | } else if (IN_SET(buffer[0], 2, 9)) { |
e5ebf783 | 197 | uint32_t size; |
21bc923a | 198 | char **l; |
e5ebf783 | 199 | |
4cf07da2 | 200 | /* One or more answers */ |
e5ebf783 LP |
201 | if (p < 5) |
202 | continue; | |
203 | ||
204 | memcpy(&size, buffer+1, sizeof(size)); | |
bb53abeb | 205 | size = le32toh(size); |
1602b008 LP |
206 | if (size + 5 > sizeof(buffer)) { |
207 | r = -EIO; | |
208 | goto finish; | |
209 | } | |
e5ebf783 LP |
210 | |
211 | if (p-5 < size) | |
212 | continue; | |
213 | ||
1d749d04 | 214 | l = strv_parse_nulstr(buffer + 5, size); |
1602b008 LP |
215 | if (!l) { |
216 | r = -ENOMEM; | |
217 | goto finish; | |
218 | } | |
e5ebf783 | 219 | |
e287086b | 220 | *ret = l; |
e5ebf783 | 221 | break; |
21bc923a | 222 | |
1602b008 | 223 | } else { |
e5ebf783 | 224 | /* Unknown packet */ |
1602b008 LP |
225 | r = -EIO; |
226 | goto finish; | |
227 | } | |
e5ebf783 LP |
228 | } |
229 | ||
1602b008 LP |
230 | r = 0; |
231 | ||
232 | finish: | |
87f54463 | 233 | explicit_bzero_safe(buffer, sizeof(buffer)); |
1602b008 | 234 | return r; |
e5ebf783 LP |
235 | } |
236 | ||
bbada6d7 JAS |
237 | static int send_passwords(const char *socket_name, char **passwords) { |
238 | _cleanup_free_ char *packet = NULL; | |
239 | _cleanup_close_ int socket_fd = -1; | |
15a3e96f | 240 | union sockaddr_union sa = {}; |
bbada6d7 JAS |
241 | size_t packet_length = 1; |
242 | char **p, *d; | |
5439206b | 243 | ssize_t n; |
15a3e96f | 244 | int r, salen; |
bbada6d7 JAS |
245 | |
246 | assert(socket_name); | |
247 | ||
15a3e96f LP |
248 | salen = sockaddr_un_set_path(&sa.un, socket_name); |
249 | if (salen < 0) | |
250 | return salen; | |
251 | ||
bbada6d7 JAS |
252 | STRV_FOREACH(p, passwords) |
253 | packet_length += strlen(*p) + 1; | |
254 | ||
255 | packet = new(char, packet_length); | |
256 | if (!packet) | |
257 | return -ENOMEM; | |
258 | ||
259 | packet[0] = '+'; | |
260 | ||
261 | d = packet + 1; | |
262 | STRV_FOREACH(p, passwords) | |
263 | d = stpcpy(d, *p) + 1; | |
264 | ||
265 | socket_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0); | |
266 | if (socket_fd < 0) { | |
267 | r = log_debug_errno(errno, "socket(): %m"); | |
268 | goto finish; | |
269 | } | |
270 | ||
15a3e96f | 271 | n = sendto(socket_fd, packet, packet_length, MSG_NOSIGNAL, &sa.sa, salen); |
5439206b | 272 | if (n < 0) { |
bbada6d7 | 273 | r = log_debug_errno(errno, "sendto(): %m"); |
5439206b LP |
274 | goto finish; |
275 | } | |
276 | ||
277 | r = (int) n; | |
bbada6d7 JAS |
278 | |
279 | finish: | |
87f54463 | 280 | explicit_bzero_safe(packet, packet_length); |
bbada6d7 JAS |
281 | return r; |
282 | } | |
283 | ||
0ddf1d3a | 284 | static int parse_password(const char *filename, char **wall) { |
bbada6d7 | 285 | _cleanup_free_ char *socket_name = NULL, *message = NULL; |
1602b008 | 286 | bool accept_cached = false, echo = false; |
ec863ba6 LP |
287 | uint64_t not_after = 0; |
288 | unsigned pid = 0; | |
ec863ba6 | 289 | |
f975e971 LP |
290 | const ConfigTableItem items[] = { |
291 | { "Ask", "Socket", config_parse_string, 0, &socket_name }, | |
292 | { "Ask", "NotAfter", config_parse_uint64, 0, ¬_after }, | |
293 | { "Ask", "Message", config_parse_string, 0, &message }, | |
294 | { "Ask", "PID", config_parse_unsigned, 0, &pid }, | |
295 | { "Ask", "AcceptCached", config_parse_bool, 0, &accept_cached }, | |
64845bdc | 296 | { "Ask", "Echo", config_parse_bool, 0, &echo }, |
1d749d04 | 297 | {} |
ec863ba6 LP |
298 | }; |
299 | ||
ec863ba6 | 300 | int r; |
ec863ba6 LP |
301 | |
302 | assert(filename); | |
303 | ||
36f822c4 ZJS |
304 | r = config_parse(NULL, filename, NULL, |
305 | NULL, | |
306 | config_item_table_lookup, items, | |
bcde742e | 307 | CONFIG_PARSE_RELAXED|CONFIG_PARSE_WARN, NULL); |
36f822c4 ZJS |
308 | if (r < 0) |
309 | return r; | |
ec863ba6 | 310 | |
baaa35ad ZJS |
311 | if (!socket_name) |
312 | return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), | |
313 | "Invalid password file %s", filename); | |
ec863ba6 | 314 | |
e46eab86 ZJS |
315 | if (not_after > 0 && now(CLOCK_MONOTONIC) > not_after) |
316 | return 0; | |
ec863ba6 | 317 | |
e46eab86 ZJS |
318 | if (pid > 0 && !pid_is_alive(pid)) |
319 | return 0; | |
ded80335 | 320 | |
ec863ba6 LP |
321 | if (arg_action == ACTION_LIST) |
322 | printf("'%s' (PID %u)\n", message, pid); | |
e46eab86 | 323 | |
ec863ba6 | 324 | else if (arg_action == ACTION_WALL) { |
0ddf1d3a | 325 | char *_wall; |
ec863ba6 | 326 | |
0ddf1d3a LP |
327 | if (asprintf(&_wall, |
328 | "%s%sPassword entry required for \'%s\' (PID %u).\r\n" | |
a1c111c2 | 329 | "Please enter password with the systemd-tty-ask-password-agent tool:", |
5cfee414 | 330 | strempty(*wall), |
0ddf1d3a | 331 | *wall ? "\r\n\r\n" : "", |
ec863ba6 | 332 | message, |
e46eab86 ZJS |
333 | pid) < 0) |
334 | return log_oom(); | |
ec863ba6 | 335 | |
0ddf1d3a LP |
336 | free(*wall); |
337 | *wall = _wall; | |
e46eab86 | 338 | |
ec863ba6 | 339 | } else { |
bbada6d7 | 340 | _cleanup_strv_free_erase_ char **passwords = NULL; |
ec863ba6 | 341 | |
3742095b | 342 | assert(IN_SET(arg_action, ACTION_QUERY, ACTION_WATCH)); |
ec863ba6 LP |
343 | |
344 | if (access(socket_name, W_OK) < 0) { | |
ec863ba6 LP |
345 | if (arg_action == ACTION_QUERY) |
346 | log_info("Not querying '%s' (PID %u), lacking privileges.", message, pid); | |
347 | ||
e46eab86 | 348 | return 0; |
ec863ba6 LP |
349 | } |
350 | ||
bbada6d7 | 351 | if (arg_plymouth) |
e287086b | 352 | r = ask_password_plymouth(message, not_after, accept_cached ? ASK_PASSWORD_ACCEPT_CACHED : 0, filename, &passwords); |
bbada6d7 | 353 | else { |
00843602 | 354 | int tty_fd = -1; |
0cf84693 | 355 | |
e46eab86 | 356 | if (arg_console) { |
149bc84a | 357 | const char *con = arg_device ?: "/dev/console"; |
6af62124 | 358 | |
8854d795 | 359 | tty_fd = acquire_terminal(con, ACQUIRE_TERMINAL_WAIT, USEC_INFINITY); |
e46eab86 | 360 | if (tty_fd < 0) |
befd657b | 361 | return log_error_errno(tty_fd, "Failed to acquire %s: %m", con); |
3d18b167 LP |
362 | |
363 | r = reset_terminal_fd(tty_fd, true); | |
364 | if (r < 0) | |
365 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
e46eab86 | 366 | } |
0cf84693 | 367 | |
c2b32159 LP |
368 | r = ask_password_tty(tty_fd, message, NULL, not_after, |
369 | (echo ? ASK_PASSWORD_ECHO : 0) | | |
370 | (arg_console ? ASK_PASSWORD_CONSOLE_COLOR : 0), | |
c7b7d74e | 371 | filename, &passwords); |
e5ebf783 | 372 | |
0cf84693 | 373 | if (arg_console) { |
00843602 | 374 | tty_fd = safe_close(tty_fd); |
0cf84693 LP |
375 | release_terminal(); |
376 | } | |
1602b008 | 377 | } |
ec863ba6 | 378 | |
bbada6d7 JAS |
379 | /* If the query went away, that's OK */ |
380 | if (IN_SET(r, -ETIME, -ENOENT)) | |
381 | return 0; | |
ec863ba6 | 382 | |
bbada6d7 JAS |
383 | if (r < 0) |
384 | return log_error_errno(r, "Failed to query password: %m"); | |
ec863ba6 | 385 | |
bbada6d7 | 386 | r = send_passwords(socket_name, passwords); |
00843602 | 387 | if (r < 0) |
bbada6d7 | 388 | return log_error_errno(r, "Failed to send: %m"); |
ec863ba6 LP |
389 | } |
390 | ||
e46eab86 | 391 | return 0; |
ec863ba6 LP |
392 | } |
393 | ||
0cf84693 | 394 | static int wall_tty_block(void) { |
1d749d04 | 395 | _cleanup_free_ char *p = NULL; |
fc116c6a | 396 | dev_t devnr; |
00843602 | 397 | int fd, r; |
7af53310 | 398 | |
4d6d6518 | 399 | r = get_ctty_devnr(0, &devnr); |
e287086b LP |
400 | if (r == -ENXIO) /* We have no controlling tty */ |
401 | return -ENOTTY; | |
4d6d6518 | 402 | if (r < 0) |
00843602 | 403 | return log_error_errno(r, "Failed to get controlling TTY: %m"); |
7af53310 | 404 | |
2b583ce6 | 405 | if (asprintf(&p, "/run/systemd/ask-password-block/%u:%u", major(devnr), minor(devnr)) < 0) |
00843602 | 406 | return log_oom(); |
7af53310 | 407 | |
e3e2cf07 LP |
408 | (void) mkdir_parents_label(p, 0700); |
409 | (void) mkfifo(p, 0600); | |
7af53310 LP |
410 | |
411 | fd = open(p, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
7af53310 | 412 | if (fd < 0) |
2ee4e222 | 413 | return log_debug_errno(errno, "Failed to open %s: %m", p); |
7af53310 LP |
414 | |
415 | return fd; | |
416 | } | |
417 | ||
99f710dd | 418 | static bool wall_tty_match(const char *path, void *userdata) { |
1d749d04 | 419 | _cleanup_free_ char *p = NULL; |
00843602 LP |
420 | _cleanup_close_ int fd = -1; |
421 | struct stat st; | |
fc116c6a | 422 | |
1d749d04 | 423 | if (!path_is_absolute(path)) |
63c372cb | 424 | path = strjoina("/dev/", path); |
fc116c6a | 425 | |
00843602 LP |
426 | if (lstat(path, &st) < 0) { |
427 | log_debug_errno(errno, "Failed to stat %s: %m", path); | |
fc116c6a | 428 | return true; |
00843602 | 429 | } |
fc116c6a | 430 | |
00843602 LP |
431 | if (!S_ISCHR(st.st_mode)) { |
432 | log_debug("%s is not a character device.", path); | |
fc116c6a | 433 | return true; |
00843602 | 434 | } |
7af53310 LP |
435 | |
436 | /* We use named pipes to ensure that wall messages suggesting | |
437 | * password entry are not printed over password prompts | |
438 | * already shown. We use the fact here that opening a pipe in | |
439 | * non-blocking mode for write-only will succeed only if | |
440 | * there's some writer behind it. Using pipes has the | |
441 | * advantage that the block will automatically go away if the | |
442 | * process dies. */ | |
443 | ||
00843602 LP |
444 | if (asprintf(&p, "/run/systemd/ask-password-block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0) { |
445 | log_oom(); | |
7af53310 | 446 | return true; |
00843602 | 447 | } |
7af53310 LP |
448 | |
449 | fd = open(p, O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
00843602 | 450 | if (fd < 0) { |
fe4a1d0f | 451 | log_debug_errno(errno, "Failed to open the wall pipe: %m"); |
00843602 LP |
452 | return 1; |
453 | } | |
7af53310 LP |
454 | |
455 | /* What, we managed to open the pipe? Then this tty is filtered. */ | |
00843602 | 456 | return 0; |
7af53310 LP |
457 | } |
458 | ||
ec863ba6 | 459 | static int show_passwords(void) { |
1d749d04 | 460 | _cleanup_closedir_ DIR *d; |
ec863ba6 LP |
461 | struct dirent *de; |
462 | int r = 0; | |
463 | ||
1d749d04 ZJS |
464 | d = opendir("/run/systemd/ask-password"); |
465 | if (!d) { | |
ec863ba6 LP |
466 | if (errno == ENOENT) |
467 | return 0; | |
468 | ||
ad71eee5 | 469 | return log_error_errno(errno, "Failed to open /run/systemd/ask-password: %m"); |
ec863ba6 LP |
470 | } |
471 | ||
00843602 | 472 | FOREACH_DIRENT_ALL(de, d, return log_error_errno(errno, "Failed to read directory: %m")) { |
1d749d04 | 473 | _cleanup_free_ char *p = NULL, *wall = NULL; |
ec863ba6 LP |
474 | int q; |
475 | ||
1a6f4df6 LP |
476 | /* We only support /dev on tmpfs, hence we can rely on |
477 | * d_type to be reliable */ | |
478 | ||
ec863ba6 LP |
479 | if (de->d_type != DT_REG) |
480 | continue; | |
481 | ||
55cdd057 | 482 | if (hidden_or_backup_file(de->d_name)) |
ec863ba6 LP |
483 | continue; |
484 | ||
485 | if (!startswith(de->d_name, "ask.")) | |
486 | continue; | |
487 | ||
1d749d04 ZJS |
488 | p = strappend("/run/systemd/ask-password/", de->d_name); |
489 | if (!p) | |
490 | return log_oom(); | |
ec863ba6 | 491 | |
1d749d04 ZJS |
492 | q = parse_password(p, &wall); |
493 | if (q < 0 && r == 0) | |
ec863ba6 LP |
494 | r = q; |
495 | ||
1d749d04 | 496 | if (wall) |
00843602 | 497 | (void) utmp_wall(wall, NULL, NULL, wall_tty_match, NULL); |
ec863ba6 LP |
498 | } |
499 | ||
ec863ba6 LP |
500 | return r; |
501 | } | |
502 | ||
503 | static int watch_passwords(void) { | |
b9ba604e LP |
504 | enum { |
505 | FD_INOTIFY, | |
506 | FD_SIGNAL, | |
507 | _FD_MAX | |
508 | }; | |
509 | ||
1d749d04 | 510 | _cleanup_close_ int notify = -1, signal_fd = -1, tty_block_fd = -1; |
b92bea5d | 511 | struct pollfd pollfd[_FD_MAX] = {}; |
b9ba604e | 512 | sigset_t mask; |
ec863ba6 LP |
513 | int r; |
514 | ||
0cf84693 | 515 | tty_block_fd = wall_tty_block(); |
7af53310 | 516 | |
00843602 | 517 | (void) mkdir_p_label("/run/systemd/ask-password", 0755); |
ec863ba6 | 518 | |
1d749d04 ZJS |
519 | notify = inotify_init1(IN_CLOEXEC); |
520 | if (notify < 0) | |
00843602 | 521 | return log_error_errno(errno, "Failed to allocate directory watch: %m"); |
ec863ba6 | 522 | |
1432d2db JS |
523 | if (inotify_add_watch(notify, "/run/systemd/ask-password", IN_CLOSE_WRITE|IN_MOVED_TO) < 0) { |
524 | if (errno == ENOSPC) | |
525 | return log_error_errno(errno, "Failed to add /run/systemd/ask-password to directory watch: inotify watch limit reached"); | |
526 | else | |
527 | return log_error_errno(errno, "Failed to add /run/systemd/ask-password to directory watch: %m"); | |
528 | } | |
ec863ba6 | 529 | |
72c0a2c2 LP |
530 | assert_se(sigemptyset(&mask) >= 0); |
531 | assert_se(sigset_add_many(&mask, SIGINT, SIGTERM, -1) >= 0); | |
532 | assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) >= 0); | |
b9ba604e | 533 | |
1d749d04 ZJS |
534 | signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); |
535 | if (signal_fd < 0) | |
00843602 | 536 | return log_error_errno(errno, "Failed to allocate signal file descriptor: %m"); |
b9ba604e | 537 | |
b9ba604e LP |
538 | pollfd[FD_INOTIFY].fd = notify; |
539 | pollfd[FD_INOTIFY].events = POLLIN; | |
540 | pollfd[FD_SIGNAL].fd = signal_fd; | |
541 | pollfd[FD_SIGNAL].events = POLLIN; | |
ec863ba6 LP |
542 | |
543 | for (;;) { | |
1d749d04 ZJS |
544 | r = show_passwords(); |
545 | if (r < 0) | |
da927ba9 | 546 | log_error_errno(r, "Failed to show password: %m"); |
ec863ba6 | 547 | |
b9ba604e | 548 | if (poll(pollfd, _FD_MAX, -1) < 0) { |
ec863ba6 LP |
549 | if (errno == EINTR) |
550 | continue; | |
551 | ||
1d749d04 | 552 | return -errno; |
ec863ba6 LP |
553 | } |
554 | ||
b9ba604e | 555 | if (pollfd[FD_INOTIFY].revents != 0) |
00843602 | 556 | (void) flush_fd(notify); |
b9ba604e LP |
557 | |
558 | if (pollfd[FD_SIGNAL].revents != 0) | |
559 | break; | |
ec863ba6 LP |
560 | } |
561 | ||
1d749d04 | 562 | return 0; |
ec863ba6 LP |
563 | } |
564 | ||
37ec0fdd LP |
565 | static int help(void) { |
566 | _cleanup_free_ char *link = NULL; | |
567 | int r; | |
568 | ||
569 | r = terminal_urlify_man("systemd-tty-ask-password-agent", "1", &link); | |
570 | if (r < 0) | |
571 | return log_oom(); | |
572 | ||
ec863ba6 LP |
573 | printf("%s [OPTIONS...]\n\n" |
574 | "Process system password requests.\n\n" | |
e5ebf783 | 575 | " -h --help Show this help\n" |
c52f663b | 576 | " --version Show package version\n" |
e5ebf783 LP |
577 | " --list Show pending password requests\n" |
578 | " --query Process pending password requests\n" | |
35b8ca3a HH |
579 | " --watch Continuously process password requests\n" |
580 | " --wall Continuously forward password requests to wall\n" | |
0cf84693 | 581 | " --plymouth Ask question with Plymouth instead of on TTY\n" |
37ec0fdd LP |
582 | " --console Ask question on /dev/console instead of current TTY\n" |
583 | "\nSee the %s for details.\n" | |
584 | , program_invocation_short_name | |
585 | , link | |
586 | ); | |
587 | ||
588 | return 0; | |
ec863ba6 LP |
589 | } |
590 | ||
591 | static int parse_argv(int argc, char *argv[]) { | |
592 | ||
593 | enum { | |
594 | ARG_LIST = 0x100, | |
595 | ARG_QUERY, | |
596 | ARG_WATCH, | |
597 | ARG_WALL, | |
0cf84693 | 598 | ARG_PLYMOUTH, |
c52f663b LP |
599 | ARG_CONSOLE, |
600 | ARG_VERSION | |
ec863ba6 LP |
601 | }; |
602 | ||
603 | static const struct option options[] = { | |
6af62124 WF |
604 | { "help", no_argument, NULL, 'h' }, |
605 | { "version", no_argument, NULL, ARG_VERSION }, | |
606 | { "list", no_argument, NULL, ARG_LIST }, | |
607 | { "query", no_argument, NULL, ARG_QUERY }, | |
608 | { "watch", no_argument, NULL, ARG_WATCH }, | |
609 | { "wall", no_argument, NULL, ARG_WALL }, | |
610 | { "plymouth", no_argument, NULL, ARG_PLYMOUTH }, | |
611 | { "console", optional_argument, NULL, ARG_CONSOLE }, | |
eb9da376 | 612 | {} |
ec863ba6 LP |
613 | }; |
614 | ||
615 | int c; | |
616 | ||
617 | assert(argc >= 0); | |
618 | assert(argv); | |
619 | ||
601185b4 | 620 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) |
ec863ba6 LP |
621 | |
622 | switch (c) { | |
623 | ||
624 | case 'h': | |
37ec0fdd | 625 | return help(); |
ec863ba6 | 626 | |
c52f663b | 627 | case ARG_VERSION: |
3f6fd1ba | 628 | return version(); |
c52f663b | 629 | |
ec863ba6 LP |
630 | case ARG_LIST: |
631 | arg_action = ACTION_LIST; | |
632 | break; | |
633 | ||
634 | case ARG_QUERY: | |
635 | arg_action = ACTION_QUERY; | |
636 | break; | |
637 | ||
638 | case ARG_WATCH: | |
639 | arg_action = ACTION_WATCH; | |
640 | break; | |
641 | ||
642 | case ARG_WALL: | |
643 | arg_action = ACTION_WALL; | |
644 | break; | |
645 | ||
e5ebf783 LP |
646 | case ARG_PLYMOUTH: |
647 | arg_plymouth = true; | |
648 | break; | |
649 | ||
0cf84693 LP |
650 | case ARG_CONSOLE: |
651 | arg_console = true; | |
6af62124 WF |
652 | if (optarg) { |
653 | ||
baaa35ad ZJS |
654 | if (isempty(optarg)) |
655 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
656 | "Empty console device path is not allowed."); | |
6af62124 WF |
657 | |
658 | arg_device = optarg; | |
659 | } | |
0cf84693 LP |
660 | break; |
661 | ||
ec863ba6 LP |
662 | case '?': |
663 | return -EINVAL; | |
664 | ||
665 | default: | |
eb9da376 | 666 | assert_not_reached("Unhandled option"); |
ec863ba6 | 667 | } |
ec863ba6 | 668 | |
baaa35ad ZJS |
669 | if (optind != argc) |
670 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
671 | "%s takes no arguments.", program_invocation_short_name); | |
ec863ba6 | 672 | |
6af62124 WF |
673 | if (arg_plymouth || arg_console) { |
674 | ||
baaa35ad ZJS |
675 | if (!IN_SET(arg_action, ACTION_QUERY, ACTION_WATCH)) |
676 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
677 | "Options --query and --watch conflict."); | |
6af62124 | 678 | |
baaa35ad ZJS |
679 | if (arg_plymouth && arg_console) |
680 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
681 | "Options --plymouth and --console conflict."); | |
6af62124 WF |
682 | } |
683 | ||
ec863ba6 LP |
684 | return 1; |
685 | } | |
686 | ||
6af62124 WF |
687 | /* |
688 | * To be able to ask on all terminal devices of /dev/console | |
689 | * the devices are collected. If more than one device is found, | |
690 | * then on each of the terminals a inquiring task is forked. | |
691 | * Every task has its own session and its own controlling terminal. | |
692 | * If one of the tasks does handle a password, the remaining tasks | |
693 | * will be terminated. | |
694 | */ | |
4c253ed1 | 695 | static int ask_on_this_console(const char *tty, pid_t *ret_pid, int argc, char *argv[]) { |
6af62124 WF |
696 | struct sigaction sig = { |
697 | .sa_handler = nop_signal_handler, | |
698 | .sa_flags = SA_NOCLDSTOP | SA_RESTART, | |
699 | }; | |
4c253ed1 LP |
700 | pid_t pid; |
701 | int r; | |
6af62124 WF |
702 | |
703 | assert_se(sigprocmask_many(SIG_UNBLOCK, NULL, SIGHUP, SIGCHLD, -1) >= 0); | |
704 | ||
705 | assert_se(sigemptyset(&sig.sa_mask) >= 0); | |
706 | assert_se(sigaction(SIGCHLD, &sig, NULL) >= 0); | |
707 | ||
708 | sig.sa_handler = SIG_DFL; | |
709 | assert_se(sigaction(SIGHUP, &sig, NULL) >= 0); | |
710 | ||
b6e1fff1 | 711 | r = safe_fork("(sd-passwd)", FORK_RESET_SIGNALS|FORK_LOG, &pid); |
4c253ed1 | 712 | if (r < 0) |
b6e1fff1 | 713 | return r; |
4c253ed1 | 714 | if (r == 0) { |
6af62124 WF |
715 | int ac; |
716 | ||
717 | assert_se(prctl(PR_SET_PDEATHSIG, SIGHUP) >= 0); | |
718 | ||
6af62124 WF |
719 | for (ac = 0; ac < argc; ac++) { |
720 | if (streq(argv[ac], "--console")) { | |
421eaea0 | 721 | argv[ac] = strjoina("--console=", tty); |
6af62124 WF |
722 | break; |
723 | } | |
724 | } | |
725 | ||
726 | assert(ac < argc); | |
727 | ||
728 | execv(SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, argv); | |
729 | _exit(EXIT_FAILURE); | |
730 | } | |
4c253ed1 LP |
731 | |
732 | *ret_pid = pid; | |
6af62124 WF |
733 | return 0; |
734 | } | |
735 | ||
736 | static void terminate_agents(Set *pids) { | |
737 | struct timespec ts; | |
738 | siginfo_t status = {}; | |
739 | sigset_t set; | |
740 | Iterator i; | |
741 | void *p; | |
742 | int r, signum; | |
743 | ||
744 | /* | |
745 | * Request termination of the remaining processes as those | |
746 | * are not required anymore. | |
747 | */ | |
748 | SET_FOREACH(p, pids, i) | |
749 | (void) kill(PTR_TO_PID(p), SIGTERM); | |
750 | ||
751 | /* | |
752 | * Collect the processes which have go away. | |
753 | */ | |
754 | assert_se(sigemptyset(&set) >= 0); | |
755 | assert_se(sigaddset(&set, SIGCHLD) >= 0); | |
756 | timespec_store(&ts, 50 * USEC_PER_MSEC); | |
757 | ||
758 | while (!set_isempty(pids)) { | |
759 | ||
760 | zero(status); | |
761 | r = waitid(P_ALL, 0, &status, WEXITED|WNOHANG); | |
762 | if (r < 0 && errno == EINTR) | |
763 | continue; | |
764 | ||
765 | if (r == 0 && status.si_pid > 0) { | |
766 | set_remove(pids, PID_TO_PTR(status.si_pid)); | |
767 | continue; | |
768 | } | |
769 | ||
770 | signum = sigtimedwait(&set, NULL, &ts); | |
771 | if (signum < 0) { | |
772 | if (errno != EAGAIN) | |
773 | log_error_errno(errno, "sigtimedwait() failed: %m"); | |
774 | break; | |
775 | } | |
776 | assert(signum == SIGCHLD); | |
777 | } | |
778 | ||
779 | /* | |
780 | * Kill hanging processes. | |
781 | */ | |
782 | SET_FOREACH(p, pids, i) { | |
783 | log_warning("Failed to terminate child %d, killing it", PTR_TO_PID(p)); | |
784 | (void) kill(PTR_TO_PID(p), SIGKILL); | |
785 | } | |
786 | } | |
787 | ||
788 | static int ask_on_consoles(int argc, char *argv[]) { | |
789 | _cleanup_set_free_ Set *pids = NULL; | |
790 | _cleanup_strv_free_ char **consoles = NULL; | |
791 | siginfo_t status = {}; | |
792 | char **tty; | |
793 | pid_t pid; | |
794 | int r; | |
795 | ||
796 | r = get_kernel_consoles(&consoles); | |
797 | if (r < 0) | |
798 | return log_error_errno(r, "Failed to determine devices of /dev/console: %m"); | |
799 | ||
800 | pids = set_new(NULL); | |
801 | if (!pids) | |
802 | return log_oom(); | |
803 | ||
804 | /* Start an agent on each console. */ | |
805 | STRV_FOREACH(tty, consoles) { | |
806 | r = ask_on_this_console(*tty, &pid, argc, argv); | |
807 | if (r < 0) | |
808 | return r; | |
809 | ||
810 | if (set_put(pids, PID_TO_PTR(pid)) < 0) | |
811 | return log_oom(); | |
812 | } | |
813 | ||
814 | /* Wait for an agent to exit. */ | |
815 | for (;;) { | |
816 | zero(status); | |
817 | ||
818 | if (waitid(P_ALL, 0, &status, WEXITED) < 0) { | |
819 | if (errno == EINTR) | |
820 | continue; | |
821 | ||
822 | return log_error_errno(errno, "waitid() failed: %m"); | |
823 | } | |
824 | ||
825 | set_remove(pids, PID_TO_PTR(status.si_pid)); | |
826 | break; | |
827 | } | |
828 | ||
1f0958f6 | 829 | if (!is_clean_exit(status.si_code, status.si_status, EXIT_CLEAN_DAEMON, NULL)) |
6af62124 WF |
830 | log_error("Password agent failed with: %d", status.si_status); |
831 | ||
832 | terminate_agents(pids); | |
833 | return 0; | |
834 | } | |
835 | ||
0420d20d | 836 | static int run(int argc, char *argv[]) { |
ec863ba6 LP |
837 | int r; |
838 | ||
6bf3c61c | 839 | log_setup_service(); |
ec863ba6 | 840 | |
4c12626c LP |
841 | umask(0022); |
842 | ||
1d749d04 ZJS |
843 | r = parse_argv(argc, argv); |
844 | if (r <= 0) | |
0420d20d | 845 | return r; |
ec863ba6 | 846 | |
6af62124 WF |
847 | if (arg_console && !arg_device) |
848 | /* | |
0420d20d | 849 | * Spawn a separate process for each console device. |
6af62124 | 850 | */ |
0420d20d | 851 | return ask_on_consoles(argc, argv); |
0cf84693 | 852 | |
0420d20d ZJS |
853 | if (arg_device) { |
854 | /* | |
855 | * Later on, a controlling terminal will be acquired, | |
856 | * therefore the current process has to become a session | |
857 | * leader and should not have a controlling terminal already. | |
858 | */ | |
859 | (void) setsid(); | |
860 | (void) release_terminal(); | |
6af62124 | 861 | } |
96707269 | 862 | |
0420d20d ZJS |
863 | if (IN_SET(arg_action, ACTION_WATCH, ACTION_WALL)) |
864 | return watch_passwords(); | |
865 | else | |
866 | return show_passwords(); | |
ec863ba6 | 867 | } |
0420d20d ZJS |
868 | |
869 | DEFINE_MAIN_FUNCTION(run); |