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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" |
49e942b2 | 33 | #include "mkdir.h" |
9eb977db | 34 | #include "path-util.h" |
3f6fd1ba LP |
35 | #include "process-util.h" |
36 | #include "signal-util.h" | |
e5ebf783 | 37 | #include "socket-util.h" |
07630cea | 38 | #include "string-util.h" |
21bc923a | 39 | #include "strv.h" |
288a74cc | 40 | #include "terminal-util.h" |
3f6fd1ba LP |
41 | #include "util.h" |
42 | #include "utmp-wtmp.h" | |
ec863ba6 LP |
43 | |
44 | static enum { | |
45 | ACTION_LIST, | |
46 | ACTION_QUERY, | |
47 | ACTION_WATCH, | |
48 | ACTION_WALL | |
49 | } arg_action = ACTION_QUERY; | |
50 | ||
e5ebf783 | 51 | static bool arg_plymouth = false; |
0cf84693 | 52 | static bool arg_console = false; |
6af62124 | 53 | static const char *arg_device = NULL; |
e5ebf783 | 54 | |
21bc923a LP |
55 | static int ask_password_plymouth( |
56 | const char *message, | |
57 | usec_t until, | |
e287086b | 58 | AskPasswordFlags flags, |
21bc923a | 59 | const char *flag_file, |
e287086b | 60 | char ***ret) { |
21bc923a | 61 | |
fc2fffe7 | 62 | static const union sockaddr_union sa = PLYMOUTH_SOCKET; |
1d749d04 | 63 | _cleanup_close_ int fd = -1, notify = -1; |
1d749d04 | 64 | _cleanup_free_ char *packet = NULL; |
e5ebf783 LP |
65 | ssize_t k; |
66 | int r, n; | |
b92bea5d | 67 | struct pollfd pollfd[2] = {}; |
e5ebf783 LP |
68 | char buffer[LINE_MAX]; |
69 | size_t p = 0; | |
70 | enum { | |
71 | POLL_SOCKET, | |
72 | POLL_INOTIFY | |
73 | }; | |
74 | ||
e287086b | 75 | assert(ret); |
21bc923a | 76 | |
e5ebf783 | 77 | if (flag_file) { |
1d749d04 ZJS |
78 | notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK); |
79 | if (notify < 0) | |
80 | return -errno; | |
e5ebf783 | 81 | |
1d749d04 ZJS |
82 | r = inotify_add_watch(notify, flag_file, IN_ATTRIB); /* for the link count */ |
83 | if (r < 0) | |
84 | return -errno; | |
e5ebf783 LP |
85 | } |
86 | ||
1d749d04 ZJS |
87 | fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
88 | if (fd < 0) | |
89 | return -errno; | |
e5ebf783 | 90 | |
fc2fffe7 | 91 | r = connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)); |
4a62c710 | 92 | if (r < 0) |
00843602 | 93 | return -errno; |
e5ebf783 | 94 | |
e287086b | 95 | if (flags & ASK_PASSWORD_ACCEPT_CACHED) { |
21bc923a LP |
96 | packet = strdup("c"); |
97 | n = 1; | |
00843602 | 98 | } else if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0) |
7de80bfe | 99 | packet = NULL; |
1d749d04 | 100 | if (!packet) |
00843602 | 101 | return -ENOMEM; |
e5ebf783 | 102 | |
553acb7b ZJS |
103 | r = loop_write(fd, packet, n + 1, true); |
104 | if (r < 0) | |
105 | return r; | |
e5ebf783 | 106 | |
e5ebf783 LP |
107 | pollfd[POLL_SOCKET].fd = fd; |
108 | pollfd[POLL_SOCKET].events = POLLIN; | |
109 | pollfd[POLL_INOTIFY].fd = notify; | |
110 | pollfd[POLL_INOTIFY].events = POLLIN; | |
111 | ||
112 | for (;;) { | |
113 | int sleep_for = -1, j; | |
114 | ||
115 | if (until > 0) { | |
116 | usec_t y; | |
117 | ||
118 | y = now(CLOCK_MONOTONIC); | |
119 | ||
1602b008 LP |
120 | if (y > until) { |
121 | r = -ETIME; | |
122 | goto finish; | |
123 | } | |
e5ebf783 LP |
124 | |
125 | sleep_for = (int) ((until - y) / USEC_PER_MSEC); | |
126 | } | |
127 | ||
1602b008 LP |
128 | if (flag_file && access(flag_file, F_OK) < 0) { |
129 | r = -errno; | |
130 | goto finish; | |
131 | } | |
e5ebf783 | 132 | |
e287086b | 133 | j = poll(pollfd, notify >= 0 ? 2 : 1, sleep_for); |
1d749d04 | 134 | if (j < 0) { |
e5ebf783 LP |
135 | if (errno == EINTR) |
136 | continue; | |
137 | ||
1602b008 LP |
138 | r = -errno; |
139 | goto finish; | |
140 | } else if (j == 0) { | |
141 | r = -ETIME; | |
142 | goto finish; | |
143 | } | |
e5ebf783 | 144 | |
e287086b | 145 | if (notify >= 0 && pollfd[POLL_INOTIFY].revents != 0) |
665dfe93 | 146 | (void) flush_fd(notify); |
e5ebf783 LP |
147 | |
148 | if (pollfd[POLL_SOCKET].revents == 0) | |
149 | continue; | |
150 | ||
1d749d04 | 151 | k = read(fd, buffer + p, sizeof(buffer) - p); |
e287086b | 152 | if (k < 0) { |
3742095b | 153 | if (IN_SET(errno, EINTR, EAGAIN)) |
e287086b LP |
154 | continue; |
155 | ||
1602b008 LP |
156 | r = -errno; |
157 | goto finish; | |
158 | } else if (k == 0) { | |
159 | r = -EIO; | |
160 | goto finish; | |
161 | } | |
e5ebf783 LP |
162 | |
163 | p += k; | |
164 | ||
165 | if (p < 1) | |
166 | continue; | |
167 | ||
168 | if (buffer[0] == 5) { | |
21bc923a | 169 | |
e287086b | 170 | if (flags & ASK_PASSWORD_ACCEPT_CACHED) { |
21bc923a LP |
171 | /* Hmm, first try with cached |
172 | * passwords failed, so let's retry | |
173 | * with a normal password request */ | |
97b11eed | 174 | packet = mfree(packet); |
21bc923a | 175 | |
1602b008 LP |
176 | if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0) { |
177 | r = -ENOMEM; | |
178 | goto finish; | |
179 | } | |
21bc923a | 180 | |
553acb7b ZJS |
181 | r = loop_write(fd, packet, n+1, true); |
182 | if (r < 0) | |
1602b008 | 183 | goto finish; |
21bc923a | 184 | |
e287086b | 185 | flags &= ~ASK_PASSWORD_ACCEPT_CACHED; |
21bc923a LP |
186 | p = 0; |
187 | continue; | |
188 | } | |
189 | ||
e5ebf783 | 190 | /* No password, because UI not shown */ |
1602b008 LP |
191 | r = -ENOENT; |
192 | goto finish; | |
e5ebf783 | 193 | |
4c701096 | 194 | } else if (IN_SET(buffer[0], 2, 9)) { |
e5ebf783 | 195 | uint32_t size; |
21bc923a | 196 | char **l; |
e5ebf783 | 197 | |
4cf07da2 | 198 | /* One or more answers */ |
e5ebf783 LP |
199 | if (p < 5) |
200 | continue; | |
201 | ||
202 | memcpy(&size, buffer+1, sizeof(size)); | |
bb53abeb | 203 | size = le32toh(size); |
1602b008 LP |
204 | if (size + 5 > sizeof(buffer)) { |
205 | r = -EIO; | |
206 | goto finish; | |
207 | } | |
e5ebf783 LP |
208 | |
209 | if (p-5 < size) | |
210 | continue; | |
211 | ||
1d749d04 | 212 | l = strv_parse_nulstr(buffer + 5, size); |
1602b008 LP |
213 | if (!l) { |
214 | r = -ENOMEM; | |
215 | goto finish; | |
216 | } | |
e5ebf783 | 217 | |
e287086b | 218 | *ret = l; |
e5ebf783 | 219 | break; |
21bc923a | 220 | |
1602b008 | 221 | } else { |
e5ebf783 | 222 | /* Unknown packet */ |
1602b008 LP |
223 | r = -EIO; |
224 | goto finish; | |
225 | } | |
e5ebf783 LP |
226 | } |
227 | ||
1602b008 LP |
228 | r = 0; |
229 | ||
230 | finish: | |
2d26d8e0 | 231 | explicit_bzero(buffer, sizeof(buffer)); |
1602b008 | 232 | return r; |
e5ebf783 LP |
233 | } |
234 | ||
bbada6d7 JAS |
235 | static int send_passwords(const char *socket_name, char **passwords) { |
236 | _cleanup_free_ char *packet = NULL; | |
237 | _cleanup_close_ int socket_fd = -1; | |
238 | union sockaddr_union sa = { .un.sun_family = AF_UNIX }; | |
239 | size_t packet_length = 1; | |
240 | char **p, *d; | |
5439206b | 241 | ssize_t n; |
bbada6d7 JAS |
242 | int r; |
243 | ||
244 | assert(socket_name); | |
245 | ||
246 | STRV_FOREACH(p, passwords) | |
247 | packet_length += strlen(*p) + 1; | |
248 | ||
249 | packet = new(char, packet_length); | |
250 | if (!packet) | |
251 | return -ENOMEM; | |
252 | ||
253 | packet[0] = '+'; | |
254 | ||
255 | d = packet + 1; | |
256 | STRV_FOREACH(p, passwords) | |
257 | d = stpcpy(d, *p) + 1; | |
258 | ||
259 | socket_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0); | |
260 | if (socket_fd < 0) { | |
261 | r = log_debug_errno(errno, "socket(): %m"); | |
262 | goto finish; | |
263 | } | |
264 | ||
265 | strncpy(sa.un.sun_path, socket_name, sizeof(sa.un.sun_path)); | |
266 | ||
5439206b LP |
267 | n = sendto(socket_fd, packet, packet_length, MSG_NOSIGNAL, &sa.sa, SOCKADDR_UN_LEN(sa.un)); |
268 | if (n < 0) { | |
bbada6d7 | 269 | r = log_debug_errno(errno, "sendto(): %m"); |
5439206b LP |
270 | goto finish; |
271 | } | |
272 | ||
273 | r = (int) n; | |
bbada6d7 JAS |
274 | |
275 | finish: | |
2d26d8e0 | 276 | explicit_bzero(packet, packet_length); |
bbada6d7 JAS |
277 | return r; |
278 | } | |
279 | ||
0ddf1d3a | 280 | static int parse_password(const char *filename, char **wall) { |
bbada6d7 | 281 | _cleanup_free_ char *socket_name = NULL, *message = NULL; |
1602b008 | 282 | bool accept_cached = false, echo = false; |
ec863ba6 LP |
283 | uint64_t not_after = 0; |
284 | unsigned pid = 0; | |
ec863ba6 | 285 | |
f975e971 LP |
286 | const ConfigTableItem items[] = { |
287 | { "Ask", "Socket", config_parse_string, 0, &socket_name }, | |
288 | { "Ask", "NotAfter", config_parse_uint64, 0, ¬_after }, | |
289 | { "Ask", "Message", config_parse_string, 0, &message }, | |
290 | { "Ask", "PID", config_parse_unsigned, 0, &pid }, | |
291 | { "Ask", "AcceptCached", config_parse_bool, 0, &accept_cached }, | |
64845bdc | 292 | { "Ask", "Echo", config_parse_bool, 0, &echo }, |
1d749d04 | 293 | {} |
ec863ba6 LP |
294 | }; |
295 | ||
ec863ba6 | 296 | int r; |
ec863ba6 LP |
297 | |
298 | assert(filename); | |
299 | ||
36f822c4 ZJS |
300 | r = config_parse(NULL, filename, NULL, |
301 | NULL, | |
302 | config_item_table_lookup, items, | |
bcde742e | 303 | CONFIG_PARSE_RELAXED|CONFIG_PARSE_WARN, NULL); |
36f822c4 ZJS |
304 | if (r < 0) |
305 | return r; | |
ec863ba6 | 306 | |
7dcda352 | 307 | if (!socket_name) { |
ec863ba6 | 308 | log_error("Invalid password file %s", filename); |
e46eab86 | 309 | return -EBADMSG; |
ec863ba6 LP |
310 | } |
311 | ||
e46eab86 ZJS |
312 | if (not_after > 0 && now(CLOCK_MONOTONIC) > not_after) |
313 | return 0; | |
ec863ba6 | 314 | |
e46eab86 ZJS |
315 | if (pid > 0 && !pid_is_alive(pid)) |
316 | return 0; | |
ded80335 | 317 | |
ec863ba6 LP |
318 | if (arg_action == ACTION_LIST) |
319 | printf("'%s' (PID %u)\n", message, pid); | |
e46eab86 | 320 | |
ec863ba6 | 321 | else if (arg_action == ACTION_WALL) { |
0ddf1d3a | 322 | char *_wall; |
ec863ba6 | 323 | |
0ddf1d3a LP |
324 | if (asprintf(&_wall, |
325 | "%s%sPassword entry required for \'%s\' (PID %u).\r\n" | |
a1c111c2 | 326 | "Please enter password with the systemd-tty-ask-password-agent tool:", |
5cfee414 | 327 | strempty(*wall), |
0ddf1d3a | 328 | *wall ? "\r\n\r\n" : "", |
ec863ba6 | 329 | message, |
e46eab86 ZJS |
330 | pid) < 0) |
331 | return log_oom(); | |
ec863ba6 | 332 | |
0ddf1d3a LP |
333 | free(*wall); |
334 | *wall = _wall; | |
e46eab86 | 335 | |
ec863ba6 | 336 | } else { |
bbada6d7 | 337 | _cleanup_strv_free_erase_ char **passwords = NULL; |
ec863ba6 | 338 | |
3742095b | 339 | assert(IN_SET(arg_action, ACTION_QUERY, ACTION_WATCH)); |
ec863ba6 LP |
340 | |
341 | if (access(socket_name, W_OK) < 0) { | |
ec863ba6 LP |
342 | if (arg_action == ACTION_QUERY) |
343 | log_info("Not querying '%s' (PID %u), lacking privileges.", message, pid); | |
344 | ||
e46eab86 | 345 | return 0; |
ec863ba6 LP |
346 | } |
347 | ||
bbada6d7 | 348 | if (arg_plymouth) |
e287086b | 349 | r = ask_password_plymouth(message, not_after, accept_cached ? ASK_PASSWORD_ACCEPT_CACHED : 0, filename, &passwords); |
bbada6d7 JAS |
350 | else { |
351 | char *password = NULL; | |
00843602 | 352 | int tty_fd = -1; |
0cf84693 | 353 | |
e46eab86 | 354 | if (arg_console) { |
149bc84a | 355 | const char *con = arg_device ?: "/dev/console"; |
6af62124 | 356 | |
8854d795 | 357 | tty_fd = acquire_terminal(con, ACQUIRE_TERMINAL_WAIT, USEC_INFINITY); |
e46eab86 | 358 | if (tty_fd < 0) |
befd657b | 359 | return log_error_errno(tty_fd, "Failed to acquire %s: %m", con); |
3d18b167 LP |
360 | |
361 | r = reset_terminal_fd(tty_fd, true); | |
362 | if (r < 0) | |
363 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
e46eab86 | 364 | } |
0cf84693 | 365 | |
c2b32159 LP |
366 | r = ask_password_tty(tty_fd, message, NULL, not_after, |
367 | (echo ? ASK_PASSWORD_ECHO : 0) | | |
368 | (arg_console ? ASK_PASSWORD_CONSOLE_COLOR : 0), | |
369 | filename, &password); | |
e5ebf783 | 370 | |
0cf84693 | 371 | if (arg_console) { |
00843602 | 372 | tty_fd = safe_close(tty_fd); |
0cf84693 LP |
373 | release_terminal(); |
374 | } | |
21bc923a | 375 | |
bbada6d7 JAS |
376 | if (r >= 0) |
377 | r = strv_push(&passwords, password); | |
0cf84693 | 378 | |
bbada6d7 JAS |
379 | if (r < 0) |
380 | string_free_erase(password); | |
1602b008 | 381 | } |
ec863ba6 | 382 | |
bbada6d7 JAS |
383 | /* If the query went away, that's OK */ |
384 | if (IN_SET(r, -ETIME, -ENOENT)) | |
385 | return 0; | |
ec863ba6 | 386 | |
bbada6d7 JAS |
387 | if (r < 0) |
388 | return log_error_errno(r, "Failed to query password: %m"); | |
ec863ba6 | 389 | |
bbada6d7 | 390 | r = send_passwords(socket_name, passwords); |
00843602 | 391 | if (r < 0) |
bbada6d7 | 392 | return log_error_errno(r, "Failed to send: %m"); |
ec863ba6 LP |
393 | } |
394 | ||
e46eab86 | 395 | return 0; |
ec863ba6 LP |
396 | } |
397 | ||
0cf84693 | 398 | static int wall_tty_block(void) { |
1d749d04 | 399 | _cleanup_free_ char *p = NULL; |
fc116c6a | 400 | dev_t devnr; |
00843602 | 401 | int fd, r; |
7af53310 | 402 | |
4d6d6518 | 403 | r = get_ctty_devnr(0, &devnr); |
e287086b LP |
404 | if (r == -ENXIO) /* We have no controlling tty */ |
405 | return -ENOTTY; | |
4d6d6518 | 406 | if (r < 0) |
00843602 | 407 | return log_error_errno(r, "Failed to get controlling TTY: %m"); |
7af53310 | 408 | |
2b583ce6 | 409 | if (asprintf(&p, "/run/systemd/ask-password-block/%u:%u", major(devnr), minor(devnr)) < 0) |
00843602 | 410 | return log_oom(); |
7af53310 | 411 | |
e3e2cf07 LP |
412 | (void) mkdir_parents_label(p, 0700); |
413 | (void) mkfifo(p, 0600); | |
7af53310 LP |
414 | |
415 | fd = open(p, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
7af53310 | 416 | if (fd < 0) |
2ee4e222 | 417 | return log_debug_errno(errno, "Failed to open %s: %m", p); |
7af53310 LP |
418 | |
419 | return fd; | |
420 | } | |
421 | ||
99f710dd | 422 | static bool wall_tty_match(const char *path, void *userdata) { |
1d749d04 | 423 | _cleanup_free_ char *p = NULL; |
00843602 LP |
424 | _cleanup_close_ int fd = -1; |
425 | struct stat st; | |
fc116c6a | 426 | |
1d749d04 | 427 | if (!path_is_absolute(path)) |
63c372cb | 428 | path = strjoina("/dev/", path); |
fc116c6a | 429 | |
00843602 LP |
430 | if (lstat(path, &st) < 0) { |
431 | log_debug_errno(errno, "Failed to stat %s: %m", path); | |
fc116c6a | 432 | return true; |
00843602 | 433 | } |
fc116c6a | 434 | |
00843602 LP |
435 | if (!S_ISCHR(st.st_mode)) { |
436 | log_debug("%s is not a character device.", path); | |
fc116c6a | 437 | return true; |
00843602 | 438 | } |
7af53310 LP |
439 | |
440 | /* We use named pipes to ensure that wall messages suggesting | |
441 | * password entry are not printed over password prompts | |
442 | * already shown. We use the fact here that opening a pipe in | |
443 | * non-blocking mode for write-only will succeed only if | |
444 | * there's some writer behind it. Using pipes has the | |
445 | * advantage that the block will automatically go away if the | |
446 | * process dies. */ | |
447 | ||
00843602 LP |
448 | if (asprintf(&p, "/run/systemd/ask-password-block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0) { |
449 | log_oom(); | |
7af53310 | 450 | return true; |
00843602 | 451 | } |
7af53310 LP |
452 | |
453 | fd = open(p, O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
00843602 | 454 | if (fd < 0) { |
fe4a1d0f | 455 | log_debug_errno(errno, "Failed to open the wall pipe: %m"); |
00843602 LP |
456 | return 1; |
457 | } | |
7af53310 LP |
458 | |
459 | /* What, we managed to open the pipe? Then this tty is filtered. */ | |
00843602 | 460 | return 0; |
7af53310 LP |
461 | } |
462 | ||
ec863ba6 | 463 | static int show_passwords(void) { |
1d749d04 | 464 | _cleanup_closedir_ DIR *d; |
ec863ba6 LP |
465 | struct dirent *de; |
466 | int r = 0; | |
467 | ||
1d749d04 ZJS |
468 | d = opendir("/run/systemd/ask-password"); |
469 | if (!d) { | |
ec863ba6 LP |
470 | if (errno == ENOENT) |
471 | return 0; | |
472 | ||
ad71eee5 | 473 | return log_error_errno(errno, "Failed to open /run/systemd/ask-password: %m"); |
ec863ba6 LP |
474 | } |
475 | ||
00843602 | 476 | FOREACH_DIRENT_ALL(de, d, return log_error_errno(errno, "Failed to read directory: %m")) { |
1d749d04 | 477 | _cleanup_free_ char *p = NULL, *wall = NULL; |
ec863ba6 LP |
478 | int q; |
479 | ||
1a6f4df6 LP |
480 | /* We only support /dev on tmpfs, hence we can rely on |
481 | * d_type to be reliable */ | |
482 | ||
ec863ba6 LP |
483 | if (de->d_type != DT_REG) |
484 | continue; | |
485 | ||
55cdd057 | 486 | if (hidden_or_backup_file(de->d_name)) |
ec863ba6 LP |
487 | continue; |
488 | ||
489 | if (!startswith(de->d_name, "ask.")) | |
490 | continue; | |
491 | ||
1d749d04 ZJS |
492 | p = strappend("/run/systemd/ask-password/", de->d_name); |
493 | if (!p) | |
494 | return log_oom(); | |
ec863ba6 | 495 | |
1d749d04 ZJS |
496 | q = parse_password(p, &wall); |
497 | if (q < 0 && r == 0) | |
ec863ba6 LP |
498 | r = q; |
499 | ||
1d749d04 | 500 | if (wall) |
00843602 | 501 | (void) utmp_wall(wall, NULL, NULL, wall_tty_match, NULL); |
ec863ba6 LP |
502 | } |
503 | ||
ec863ba6 LP |
504 | return r; |
505 | } | |
506 | ||
507 | static int watch_passwords(void) { | |
b9ba604e LP |
508 | enum { |
509 | FD_INOTIFY, | |
510 | FD_SIGNAL, | |
511 | _FD_MAX | |
512 | }; | |
513 | ||
1d749d04 | 514 | _cleanup_close_ int notify = -1, signal_fd = -1, tty_block_fd = -1; |
b92bea5d | 515 | struct pollfd pollfd[_FD_MAX] = {}; |
b9ba604e | 516 | sigset_t mask; |
ec863ba6 LP |
517 | int r; |
518 | ||
0cf84693 | 519 | tty_block_fd = wall_tty_block(); |
7af53310 | 520 | |
00843602 | 521 | (void) mkdir_p_label("/run/systemd/ask-password", 0755); |
ec863ba6 | 522 | |
1d749d04 ZJS |
523 | notify = inotify_init1(IN_CLOEXEC); |
524 | if (notify < 0) | |
00843602 | 525 | return log_error_errno(errno, "Failed to allocate directory watch: %m"); |
ec863ba6 | 526 | |
1d749d04 | 527 | if (inotify_add_watch(notify, "/run/systemd/ask-password", IN_CLOSE_WRITE|IN_MOVED_TO) < 0) |
00843602 | 528 | return log_error_errno(errno, "Failed to add /run/systemd/ask-password to directory watch: %m"); |
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 | ||
654 | if (isempty(optarg)) { | |
655 | log_error("Empty console device path is not allowed."); | |
656 | return -EINVAL; | |
657 | } | |
658 | ||
659 | arg_device = optarg; | |
660 | } | |
0cf84693 LP |
661 | break; |
662 | ||
ec863ba6 LP |
663 | case '?': |
664 | return -EINVAL; | |
665 | ||
666 | default: | |
eb9da376 | 667 | assert_not_reached("Unhandled option"); |
ec863ba6 | 668 | } |
ec863ba6 LP |
669 | |
670 | if (optind != argc) { | |
601185b4 | 671 | log_error("%s takes no arguments.", program_invocation_short_name); |
ec863ba6 LP |
672 | return -EINVAL; |
673 | } | |
674 | ||
6af62124 WF |
675 | if (arg_plymouth || arg_console) { |
676 | ||
677 | if (!IN_SET(arg_action, ACTION_QUERY, ACTION_WATCH)) { | |
678 | log_error("Options --query and --watch conflict."); | |
679 | return -EINVAL; | |
680 | } | |
681 | ||
682 | if (arg_plymouth && arg_console) { | |
683 | log_error("Options --plymouth and --console conflict."); | |
684 | return -EINVAL; | |
685 | } | |
686 | } | |
687 | ||
ec863ba6 LP |
688 | return 1; |
689 | } | |
690 | ||
6af62124 WF |
691 | /* |
692 | * To be able to ask on all terminal devices of /dev/console | |
693 | * the devices are collected. If more than one device is found, | |
694 | * then on each of the terminals a inquiring task is forked. | |
695 | * Every task has its own session and its own controlling terminal. | |
696 | * If one of the tasks does handle a password, the remaining tasks | |
697 | * will be terminated. | |
698 | */ | |
4c253ed1 | 699 | static int ask_on_this_console(const char *tty, pid_t *ret_pid, int argc, char *argv[]) { |
6af62124 WF |
700 | struct sigaction sig = { |
701 | .sa_handler = nop_signal_handler, | |
702 | .sa_flags = SA_NOCLDSTOP | SA_RESTART, | |
703 | }; | |
4c253ed1 LP |
704 | pid_t pid; |
705 | int r; | |
6af62124 WF |
706 | |
707 | assert_se(sigprocmask_many(SIG_UNBLOCK, NULL, SIGHUP, SIGCHLD, -1) >= 0); | |
708 | ||
709 | assert_se(sigemptyset(&sig.sa_mask) >= 0); | |
710 | assert_se(sigaction(SIGCHLD, &sig, NULL) >= 0); | |
711 | ||
712 | sig.sa_handler = SIG_DFL; | |
713 | assert_se(sigaction(SIGHUP, &sig, NULL) >= 0); | |
714 | ||
b6e1fff1 | 715 | r = safe_fork("(sd-passwd)", FORK_RESET_SIGNALS|FORK_LOG, &pid); |
4c253ed1 | 716 | if (r < 0) |
b6e1fff1 | 717 | return r; |
4c253ed1 | 718 | if (r == 0) { |
6af62124 WF |
719 | int ac; |
720 | ||
721 | assert_se(prctl(PR_SET_PDEATHSIG, SIGHUP) >= 0); | |
722 | ||
6af62124 WF |
723 | for (ac = 0; ac < argc; ac++) { |
724 | if (streq(argv[ac], "--console")) { | |
421eaea0 | 725 | argv[ac] = strjoina("--console=", tty); |
6af62124 WF |
726 | break; |
727 | } | |
728 | } | |
729 | ||
730 | assert(ac < argc); | |
731 | ||
732 | execv(SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, argv); | |
733 | _exit(EXIT_FAILURE); | |
734 | } | |
4c253ed1 LP |
735 | |
736 | *ret_pid = pid; | |
6af62124 WF |
737 | return 0; |
738 | } | |
739 | ||
740 | static void terminate_agents(Set *pids) { | |
741 | struct timespec ts; | |
742 | siginfo_t status = {}; | |
743 | sigset_t set; | |
744 | Iterator i; | |
745 | void *p; | |
746 | int r, signum; | |
747 | ||
748 | /* | |
749 | * Request termination of the remaining processes as those | |
750 | * are not required anymore. | |
751 | */ | |
752 | SET_FOREACH(p, pids, i) | |
753 | (void) kill(PTR_TO_PID(p), SIGTERM); | |
754 | ||
755 | /* | |
756 | * Collect the processes which have go away. | |
757 | */ | |
758 | assert_se(sigemptyset(&set) >= 0); | |
759 | assert_se(sigaddset(&set, SIGCHLD) >= 0); | |
760 | timespec_store(&ts, 50 * USEC_PER_MSEC); | |
761 | ||
762 | while (!set_isempty(pids)) { | |
763 | ||
764 | zero(status); | |
765 | r = waitid(P_ALL, 0, &status, WEXITED|WNOHANG); | |
766 | if (r < 0 && errno == EINTR) | |
767 | continue; | |
768 | ||
769 | if (r == 0 && status.si_pid > 0) { | |
770 | set_remove(pids, PID_TO_PTR(status.si_pid)); | |
771 | continue; | |
772 | } | |
773 | ||
774 | signum = sigtimedwait(&set, NULL, &ts); | |
775 | if (signum < 0) { | |
776 | if (errno != EAGAIN) | |
777 | log_error_errno(errno, "sigtimedwait() failed: %m"); | |
778 | break; | |
779 | } | |
780 | assert(signum == SIGCHLD); | |
781 | } | |
782 | ||
783 | /* | |
784 | * Kill hanging processes. | |
785 | */ | |
786 | SET_FOREACH(p, pids, i) { | |
787 | log_warning("Failed to terminate child %d, killing it", PTR_TO_PID(p)); | |
788 | (void) kill(PTR_TO_PID(p), SIGKILL); | |
789 | } | |
790 | } | |
791 | ||
792 | static int ask_on_consoles(int argc, char *argv[]) { | |
793 | _cleanup_set_free_ Set *pids = NULL; | |
794 | _cleanup_strv_free_ char **consoles = NULL; | |
795 | siginfo_t status = {}; | |
796 | char **tty; | |
797 | pid_t pid; | |
798 | int r; | |
799 | ||
800 | r = get_kernel_consoles(&consoles); | |
801 | if (r < 0) | |
802 | return log_error_errno(r, "Failed to determine devices of /dev/console: %m"); | |
803 | ||
804 | pids = set_new(NULL); | |
805 | if (!pids) | |
806 | return log_oom(); | |
807 | ||
808 | /* Start an agent on each console. */ | |
809 | STRV_FOREACH(tty, consoles) { | |
810 | r = ask_on_this_console(*tty, &pid, argc, argv); | |
811 | if (r < 0) | |
812 | return r; | |
813 | ||
814 | if (set_put(pids, PID_TO_PTR(pid)) < 0) | |
815 | return log_oom(); | |
816 | } | |
817 | ||
818 | /* Wait for an agent to exit. */ | |
819 | for (;;) { | |
820 | zero(status); | |
821 | ||
822 | if (waitid(P_ALL, 0, &status, WEXITED) < 0) { | |
823 | if (errno == EINTR) | |
824 | continue; | |
825 | ||
826 | return log_error_errno(errno, "waitid() failed: %m"); | |
827 | } | |
828 | ||
829 | set_remove(pids, PID_TO_PTR(status.si_pid)); | |
830 | break; | |
831 | } | |
832 | ||
1f0958f6 | 833 | if (!is_clean_exit(status.si_code, status.si_status, EXIT_CLEAN_DAEMON, NULL)) |
6af62124 WF |
834 | log_error("Password agent failed with: %d", status.si_status); |
835 | ||
836 | terminate_agents(pids); | |
837 | return 0; | |
838 | } | |
839 | ||
ec863ba6 LP |
840 | int main(int argc, char *argv[]) { |
841 | int r; | |
842 | ||
4b261568 | 843 | log_set_target(LOG_TARGET_AUTO); |
ec863ba6 LP |
844 | log_parse_environment(); |
845 | log_open(); | |
846 | ||
4c12626c LP |
847 | umask(0022); |
848 | ||
1d749d04 ZJS |
849 | r = parse_argv(argc, argv); |
850 | if (r <= 0) | |
ec863ba6 LP |
851 | goto finish; |
852 | ||
6af62124 WF |
853 | if (arg_console && !arg_device) |
854 | /* | |
855 | * Spawn for each console device a separate process. | |
856 | */ | |
857 | r = ask_on_consoles(argc, argv); | |
858 | else { | |
859 | ||
860 | if (arg_device) { | |
861 | /* | |
862 | * Later on, a controlling terminal will be acquired, | |
863 | * therefore the current process has to become a session | |
864 | * leader and should not have a controlling terminal already. | |
865 | */ | |
866 | (void) setsid(); | |
867 | (void) release_terminal(); | |
868 | } | |
0cf84693 | 869 | |
6af62124 WF |
870 | if (IN_SET(arg_action, ACTION_WATCH, ACTION_WALL)) |
871 | r = watch_passwords(); | |
872 | else | |
873 | r = show_passwords(); | |
874 | } | |
96707269 | 875 | |
ec863ba6 LP |
876 | finish: |
877 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
878 | } |