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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> |
ca78ad1d ZJS |
18 | #include <sys/stat.h> |
19 | #include <sys/types.h> | |
ec863ba6 | 20 | #include <sys/un.h> |
ca78ad1d | 21 | #include <sys/wait.h> |
ec863ba6 | 22 | #include <unistd.h> |
ec863ba6 | 23 | |
b5efdb8a | 24 | #include "alloc-util.h" |
3f6fd1ba LP |
25 | #include "ask-password-api.h" |
26 | #include "conf-parser.h" | |
27 | #include "def.h" | |
a0956174 | 28 | #include "dirent-util.h" |
6af62124 | 29 | #include "exit-status.h" |
3ffd4af2 | 30 | #include "fd-util.h" |
6af62124 WF |
31 | #include "fileio.h" |
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" |
e56f9ffe | 39 | #include "plymouth-util.h" |
294bf0c3 | 40 | #include "pretty-print.h" |
3f6fd1ba | 41 | #include "process-util.h" |
23d5dd16 | 42 | #include "set.h" |
3f6fd1ba | 43 | #include "signal-util.h" |
e5ebf783 | 44 | #include "socket-util.h" |
07630cea | 45 | #include "string-util.h" |
21bc923a | 46 | #include "strv.h" |
288a74cc | 47 | #include "terminal-util.h" |
3f6fd1ba | 48 | #include "utmp-wtmp.h" |
ec863ba6 LP |
49 | |
50 | static enum { | |
51 | ACTION_LIST, | |
52 | ACTION_QUERY, | |
53 | ACTION_WATCH, | |
54 | ACTION_WALL | |
55 | } arg_action = ACTION_QUERY; | |
56 | ||
e5ebf783 | 57 | static bool arg_plymouth = false; |
0cf84693 | 58 | static bool arg_console = false; |
6af62124 | 59 | static const char *arg_device = NULL; |
e5ebf783 | 60 | |
21bc923a LP |
61 | static int ask_password_plymouth( |
62 | const char *message, | |
63 | usec_t until, | |
e287086b | 64 | AskPasswordFlags flags, |
21bc923a | 65 | const char *flag_file, |
e287086b | 66 | char ***ret) { |
21bc923a | 67 | |
fc2fffe7 | 68 | static const union sockaddr_union sa = PLYMOUTH_SOCKET; |
1d749d04 | 69 | _cleanup_close_ int fd = -1, notify = -1; |
1d749d04 | 70 | _cleanup_free_ char *packet = NULL; |
e5ebf783 LP |
71 | ssize_t k; |
72 | int r, n; | |
b92bea5d | 73 | struct pollfd pollfd[2] = {}; |
e5ebf783 LP |
74 | char buffer[LINE_MAX]; |
75 | size_t p = 0; | |
76 | enum { | |
77 | POLL_SOCKET, | |
78 | POLL_INOTIFY | |
79 | }; | |
80 | ||
e287086b | 81 | assert(ret); |
21bc923a | 82 | |
e5ebf783 | 83 | if (flag_file) { |
1d749d04 ZJS |
84 | notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK); |
85 | if (notify < 0) | |
86 | return -errno; | |
e5ebf783 | 87 | |
1d749d04 ZJS |
88 | r = inotify_add_watch(notify, flag_file, IN_ATTRIB); /* for the link count */ |
89 | if (r < 0) | |
90 | return -errno; | |
e5ebf783 LP |
91 | } |
92 | ||
1d749d04 ZJS |
93 | fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
94 | if (fd < 0) | |
95 | return -errno; | |
e5ebf783 | 96 | |
fc2fffe7 | 97 | r = connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)); |
4a62c710 | 98 | if (r < 0) |
00843602 | 99 | return -errno; |
e5ebf783 | 100 | |
e287086b | 101 | if (flags & ASK_PASSWORD_ACCEPT_CACHED) { |
21bc923a LP |
102 | packet = strdup("c"); |
103 | n = 1; | |
00843602 | 104 | } else if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0) |
7de80bfe | 105 | packet = NULL; |
1d749d04 | 106 | if (!packet) |
00843602 | 107 | return -ENOMEM; |
e5ebf783 | 108 | |
553acb7b ZJS |
109 | r = loop_write(fd, packet, n + 1, true); |
110 | if (r < 0) | |
111 | return r; | |
e5ebf783 | 112 | |
e5ebf783 LP |
113 | pollfd[POLL_SOCKET].fd = fd; |
114 | pollfd[POLL_SOCKET].events = POLLIN; | |
115 | pollfd[POLL_INOTIFY].fd = notify; | |
116 | pollfd[POLL_INOTIFY].events = POLLIN; | |
117 | ||
118 | for (;;) { | |
119 | int sleep_for = -1, j; | |
120 | ||
121 | if (until > 0) { | |
122 | usec_t y; | |
123 | ||
124 | y = now(CLOCK_MONOTONIC); | |
125 | ||
1602b008 LP |
126 | if (y > until) { |
127 | r = -ETIME; | |
128 | goto finish; | |
129 | } | |
e5ebf783 LP |
130 | |
131 | sleep_for = (int) ((until - y) / USEC_PER_MSEC); | |
132 | } | |
133 | ||
1602b008 LP |
134 | if (flag_file && access(flag_file, F_OK) < 0) { |
135 | r = -errno; | |
136 | goto finish; | |
137 | } | |
e5ebf783 | 138 | |
e287086b | 139 | j = poll(pollfd, notify >= 0 ? 2 : 1, sleep_for); |
1d749d04 | 140 | if (j < 0) { |
e5ebf783 LP |
141 | if (errno == EINTR) |
142 | continue; | |
143 | ||
1602b008 LP |
144 | r = -errno; |
145 | goto finish; | |
146 | } else if (j == 0) { | |
147 | r = -ETIME; | |
148 | goto finish; | |
149 | } | |
e5ebf783 | 150 | |
e287086b | 151 | if (notify >= 0 && pollfd[POLL_INOTIFY].revents != 0) |
665dfe93 | 152 | (void) flush_fd(notify); |
e5ebf783 LP |
153 | |
154 | if (pollfd[POLL_SOCKET].revents == 0) | |
155 | continue; | |
156 | ||
1d749d04 | 157 | k = read(fd, buffer + p, sizeof(buffer) - p); |
e287086b | 158 | if (k < 0) { |
3742095b | 159 | if (IN_SET(errno, EINTR, EAGAIN)) |
e287086b LP |
160 | continue; |
161 | ||
1602b008 LP |
162 | r = -errno; |
163 | goto finish; | |
164 | } else if (k == 0) { | |
165 | r = -EIO; | |
166 | goto finish; | |
167 | } | |
e5ebf783 LP |
168 | |
169 | p += k; | |
170 | ||
171 | if (p < 1) | |
172 | continue; | |
173 | ||
174 | if (buffer[0] == 5) { | |
21bc923a | 175 | |
e287086b | 176 | if (flags & ASK_PASSWORD_ACCEPT_CACHED) { |
21bc923a LP |
177 | /* Hmm, first try with cached |
178 | * passwords failed, so let's retry | |
179 | * with a normal password request */ | |
97b11eed | 180 | packet = mfree(packet); |
21bc923a | 181 | |
1602b008 LP |
182 | if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0) { |
183 | r = -ENOMEM; | |
184 | goto finish; | |
185 | } | |
21bc923a | 186 | |
553acb7b ZJS |
187 | r = loop_write(fd, packet, n+1, true); |
188 | if (r < 0) | |
1602b008 | 189 | goto finish; |
21bc923a | 190 | |
e287086b | 191 | flags &= ~ASK_PASSWORD_ACCEPT_CACHED; |
21bc923a LP |
192 | p = 0; |
193 | continue; | |
194 | } | |
195 | ||
e5ebf783 | 196 | /* No password, because UI not shown */ |
1602b008 LP |
197 | r = -ENOENT; |
198 | goto finish; | |
e5ebf783 | 199 | |
4c701096 | 200 | } else if (IN_SET(buffer[0], 2, 9)) { |
e5ebf783 | 201 | uint32_t size; |
21bc923a | 202 | char **l; |
e5ebf783 | 203 | |
4cf07da2 | 204 | /* One or more answers */ |
e5ebf783 LP |
205 | if (p < 5) |
206 | continue; | |
207 | ||
208 | memcpy(&size, buffer+1, sizeof(size)); | |
bb53abeb | 209 | size = le32toh(size); |
1602b008 LP |
210 | if (size + 5 > sizeof(buffer)) { |
211 | r = -EIO; | |
212 | goto finish; | |
213 | } | |
e5ebf783 LP |
214 | |
215 | if (p-5 < size) | |
216 | continue; | |
217 | ||
1d749d04 | 218 | l = strv_parse_nulstr(buffer + 5, size); |
1602b008 LP |
219 | if (!l) { |
220 | r = -ENOMEM; | |
221 | goto finish; | |
222 | } | |
e5ebf783 | 223 | |
e287086b | 224 | *ret = l; |
e5ebf783 | 225 | break; |
21bc923a | 226 | |
1602b008 | 227 | } else { |
e5ebf783 | 228 | /* Unknown packet */ |
1602b008 LP |
229 | r = -EIO; |
230 | goto finish; | |
231 | } | |
e5ebf783 LP |
232 | } |
233 | ||
1602b008 LP |
234 | r = 0; |
235 | ||
236 | finish: | |
87f54463 | 237 | explicit_bzero_safe(buffer, sizeof(buffer)); |
1602b008 | 238 | return r; |
e5ebf783 LP |
239 | } |
240 | ||
bbada6d7 | 241 | static int send_passwords(const char *socket_name, char **passwords) { |
e693a932 | 242 | _cleanup_(erase_and_freep) char *packet = NULL; |
bbada6d7 | 243 | _cleanup_close_ int socket_fd = -1; |
15a3e96f | 244 | union sockaddr_union sa = {}; |
bbada6d7 JAS |
245 | size_t packet_length = 1; |
246 | char **p, *d; | |
5439206b | 247 | ssize_t n; |
e693a932 | 248 | int salen; |
bbada6d7 JAS |
249 | |
250 | assert(socket_name); | |
251 | ||
15a3e96f LP |
252 | salen = sockaddr_un_set_path(&sa.un, socket_name); |
253 | if (salen < 0) | |
254 | return salen; | |
255 | ||
bbada6d7 JAS |
256 | STRV_FOREACH(p, passwords) |
257 | packet_length += strlen(*p) + 1; | |
258 | ||
259 | packet = new(char, packet_length); | |
260 | if (!packet) | |
261 | return -ENOMEM; | |
262 | ||
263 | packet[0] = '+'; | |
264 | ||
265 | d = packet + 1; | |
266 | STRV_FOREACH(p, passwords) | |
267 | d = stpcpy(d, *p) + 1; | |
268 | ||
269 | socket_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0); | |
e693a932 ZJS |
270 | if (socket_fd < 0) |
271 | return log_debug_errno(errno, "socket(): %m"); | |
bbada6d7 | 272 | |
15a3e96f | 273 | n = sendto(socket_fd, packet, packet_length, MSG_NOSIGNAL, &sa.sa, salen); |
e693a932 ZJS |
274 | if (n < 0) |
275 | return log_debug_errno(errno, "sendto(): %m"); | |
5439206b | 276 | |
e693a932 | 277 | return (int) n; |
bbada6d7 JAS |
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 | |
baaa35ad ZJS |
307 | if (!socket_name) |
308 | return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), | |
309 | "Invalid password file %s", filename); | |
ec863ba6 | 310 | |
e46eab86 ZJS |
311 | if (not_after > 0 && now(CLOCK_MONOTONIC) > not_after) |
312 | return 0; | |
ec863ba6 | 313 | |
e46eab86 ZJS |
314 | if (pid > 0 && !pid_is_alive(pid)) |
315 | return 0; | |
ded80335 | 316 | |
ec863ba6 LP |
317 | if (arg_action == ACTION_LIST) |
318 | printf("'%s' (PID %u)\n", message, pid); | |
e46eab86 | 319 | |
ec863ba6 | 320 | else if (arg_action == ACTION_WALL) { |
0ddf1d3a | 321 | char *_wall; |
ec863ba6 | 322 | |
0ddf1d3a LP |
323 | if (asprintf(&_wall, |
324 | "%s%sPassword entry required for \'%s\' (PID %u).\r\n" | |
a1c111c2 | 325 | "Please enter password with the systemd-tty-ask-password-agent tool:", |
5cfee414 | 326 | strempty(*wall), |
0ddf1d3a | 327 | *wall ? "\r\n\r\n" : "", |
ec863ba6 | 328 | message, |
e46eab86 ZJS |
329 | pid) < 0) |
330 | return log_oom(); | |
ec863ba6 | 331 | |
0ddf1d3a LP |
332 | free(*wall); |
333 | *wall = _wall; | |
e46eab86 | 334 | |
ec863ba6 | 335 | } else { |
bbada6d7 | 336 | _cleanup_strv_free_erase_ char **passwords = NULL; |
ec863ba6 | 337 | |
3742095b | 338 | assert(IN_SET(arg_action, ACTION_QUERY, ACTION_WATCH)); |
ec863ba6 LP |
339 | |
340 | if (access(socket_name, W_OK) < 0) { | |
ec863ba6 LP |
341 | if (arg_action == ACTION_QUERY) |
342 | log_info("Not querying '%s' (PID %u), lacking privileges.", message, pid); | |
343 | ||
e46eab86 | 344 | return 0; |
ec863ba6 LP |
345 | } |
346 | ||
bbada6d7 | 347 | if (arg_plymouth) |
e287086b | 348 | r = ask_password_plymouth(message, not_after, accept_cached ? ASK_PASSWORD_ACCEPT_CACHED : 0, filename, &passwords); |
bbada6d7 | 349 | else { |
00843602 | 350 | int tty_fd = -1; |
0cf84693 | 351 | |
e46eab86 | 352 | if (arg_console) { |
149bc84a | 353 | const char *con = arg_device ?: "/dev/console"; |
6af62124 | 354 | |
8854d795 | 355 | tty_fd = acquire_terminal(con, ACQUIRE_TERMINAL_WAIT, USEC_INFINITY); |
e46eab86 | 356 | if (tty_fd < 0) |
befd657b | 357 | return log_error_errno(tty_fd, "Failed to acquire %s: %m", con); |
3d18b167 LP |
358 | |
359 | r = reset_terminal_fd(tty_fd, true); | |
360 | if (r < 0) | |
361 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
e46eab86 | 362 | } |
0cf84693 | 363 | |
c2b32159 LP |
364 | r = ask_password_tty(tty_fd, message, NULL, not_after, |
365 | (echo ? ASK_PASSWORD_ECHO : 0) | | |
366 | (arg_console ? ASK_PASSWORD_CONSOLE_COLOR : 0), | |
c7b7d74e | 367 | filename, &passwords); |
e5ebf783 | 368 | |
0cf84693 | 369 | if (arg_console) { |
00843602 | 370 | tty_fd = safe_close(tty_fd); |
0cf84693 LP |
371 | release_terminal(); |
372 | } | |
1602b008 | 373 | } |
ec863ba6 | 374 | |
bbada6d7 JAS |
375 | /* If the query went away, that's OK */ |
376 | if (IN_SET(r, -ETIME, -ENOENT)) | |
377 | return 0; | |
ec863ba6 | 378 | |
bbada6d7 JAS |
379 | if (r < 0) |
380 | return log_error_errno(r, "Failed to query password: %m"); | |
ec863ba6 | 381 | |
bbada6d7 | 382 | r = send_passwords(socket_name, passwords); |
00843602 | 383 | if (r < 0) |
bbada6d7 | 384 | return log_error_errno(r, "Failed to send: %m"); |
ec863ba6 LP |
385 | } |
386 | ||
e46eab86 | 387 | return 0; |
ec863ba6 LP |
388 | } |
389 | ||
0cf84693 | 390 | static int wall_tty_block(void) { |
1d749d04 | 391 | _cleanup_free_ char *p = NULL; |
fc116c6a | 392 | dev_t devnr; |
00843602 | 393 | int fd, r; |
7af53310 | 394 | |
4d6d6518 | 395 | r = get_ctty_devnr(0, &devnr); |
e287086b LP |
396 | if (r == -ENXIO) /* We have no controlling tty */ |
397 | return -ENOTTY; | |
4d6d6518 | 398 | if (r < 0) |
00843602 | 399 | return log_error_errno(r, "Failed to get controlling TTY: %m"); |
7af53310 | 400 | |
2b583ce6 | 401 | if (asprintf(&p, "/run/systemd/ask-password-block/%u:%u", major(devnr), minor(devnr)) < 0) |
00843602 | 402 | return log_oom(); |
7af53310 | 403 | |
e3e2cf07 LP |
404 | (void) mkdir_parents_label(p, 0700); |
405 | (void) mkfifo(p, 0600); | |
7af53310 LP |
406 | |
407 | fd = open(p, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
7af53310 | 408 | if (fd < 0) |
2ee4e222 | 409 | return log_debug_errno(errno, "Failed to open %s: %m", p); |
7af53310 LP |
410 | |
411 | return fd; | |
412 | } | |
413 | ||
99f710dd | 414 | static bool wall_tty_match(const char *path, void *userdata) { |
1d749d04 | 415 | _cleanup_free_ char *p = NULL; |
00843602 LP |
416 | _cleanup_close_ int fd = -1; |
417 | struct stat st; | |
fc116c6a | 418 | |
1d749d04 | 419 | if (!path_is_absolute(path)) |
63c372cb | 420 | path = strjoina("/dev/", path); |
fc116c6a | 421 | |
00843602 LP |
422 | if (lstat(path, &st) < 0) { |
423 | log_debug_errno(errno, "Failed to stat %s: %m", path); | |
fc116c6a | 424 | return true; |
00843602 | 425 | } |
fc116c6a | 426 | |
00843602 LP |
427 | if (!S_ISCHR(st.st_mode)) { |
428 | log_debug("%s is not a character device.", path); | |
fc116c6a | 429 | return true; |
00843602 | 430 | } |
7af53310 LP |
431 | |
432 | /* We use named pipes to ensure that wall messages suggesting | |
433 | * password entry are not printed over password prompts | |
434 | * already shown. We use the fact here that opening a pipe in | |
435 | * non-blocking mode for write-only will succeed only if | |
436 | * there's some writer behind it. Using pipes has the | |
437 | * advantage that the block will automatically go away if the | |
438 | * process dies. */ | |
439 | ||
00843602 LP |
440 | if (asprintf(&p, "/run/systemd/ask-password-block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0) { |
441 | log_oom(); | |
7af53310 | 442 | return true; |
00843602 | 443 | } |
7af53310 LP |
444 | |
445 | fd = open(p, O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
00843602 | 446 | if (fd < 0) { |
fe4a1d0f | 447 | log_debug_errno(errno, "Failed to open the wall pipe: %m"); |
00843602 LP |
448 | return 1; |
449 | } | |
7af53310 LP |
450 | |
451 | /* What, we managed to open the pipe? Then this tty is filtered. */ | |
00843602 | 452 | return 0; |
7af53310 LP |
453 | } |
454 | ||
ec863ba6 | 455 | static int show_passwords(void) { |
1d749d04 | 456 | _cleanup_closedir_ DIR *d; |
ec863ba6 LP |
457 | struct dirent *de; |
458 | int r = 0; | |
459 | ||
1d749d04 ZJS |
460 | d = opendir("/run/systemd/ask-password"); |
461 | if (!d) { | |
ec863ba6 LP |
462 | if (errno == ENOENT) |
463 | return 0; | |
464 | ||
ad71eee5 | 465 | return log_error_errno(errno, "Failed to open /run/systemd/ask-password: %m"); |
ec863ba6 LP |
466 | } |
467 | ||
00843602 | 468 | FOREACH_DIRENT_ALL(de, d, return log_error_errno(errno, "Failed to read directory: %m")) { |
1d749d04 | 469 | _cleanup_free_ char *p = NULL, *wall = NULL; |
ec863ba6 LP |
470 | int q; |
471 | ||
1a6f4df6 LP |
472 | /* We only support /dev on tmpfs, hence we can rely on |
473 | * d_type to be reliable */ | |
474 | ||
ec863ba6 LP |
475 | if (de->d_type != DT_REG) |
476 | continue; | |
477 | ||
55cdd057 | 478 | if (hidden_or_backup_file(de->d_name)) |
ec863ba6 LP |
479 | continue; |
480 | ||
481 | if (!startswith(de->d_name, "ask.")) | |
482 | continue; | |
483 | ||
b910cc72 | 484 | p = path_join("/run/systemd/ask-password", de->d_name); |
1d749d04 ZJS |
485 | if (!p) |
486 | return log_oom(); | |
ec863ba6 | 487 | |
1d749d04 ZJS |
488 | q = parse_password(p, &wall); |
489 | if (q < 0 && r == 0) | |
ec863ba6 LP |
490 | r = q; |
491 | ||
1d749d04 | 492 | if (wall) |
00843602 | 493 | (void) utmp_wall(wall, NULL, NULL, wall_tty_match, NULL); |
ec863ba6 LP |
494 | } |
495 | ||
ec863ba6 LP |
496 | return r; |
497 | } | |
498 | ||
499 | static int watch_passwords(void) { | |
b9ba604e LP |
500 | enum { |
501 | FD_INOTIFY, | |
502 | FD_SIGNAL, | |
503 | _FD_MAX | |
504 | }; | |
505 | ||
1d749d04 | 506 | _cleanup_close_ int notify = -1, signal_fd = -1, tty_block_fd = -1; |
b92bea5d | 507 | struct pollfd pollfd[_FD_MAX] = {}; |
b9ba604e | 508 | sigset_t mask; |
ec863ba6 LP |
509 | int r; |
510 | ||
0cf84693 | 511 | tty_block_fd = wall_tty_block(); |
7af53310 | 512 | |
00843602 | 513 | (void) mkdir_p_label("/run/systemd/ask-password", 0755); |
ec863ba6 | 514 | |
1d749d04 ZJS |
515 | notify = inotify_init1(IN_CLOEXEC); |
516 | if (notify < 0) | |
00843602 | 517 | return log_error_errno(errno, "Failed to allocate directory watch: %m"); |
ec863ba6 | 518 | |
1432d2db JS |
519 | if (inotify_add_watch(notify, "/run/systemd/ask-password", IN_CLOSE_WRITE|IN_MOVED_TO) < 0) { |
520 | if (errno == ENOSPC) | |
521 | return log_error_errno(errno, "Failed to add /run/systemd/ask-password to directory watch: inotify watch limit reached"); | |
522 | else | |
523 | return log_error_errno(errno, "Failed to add /run/systemd/ask-password to directory watch: %m"); | |
524 | } | |
ec863ba6 | 525 | |
72c0a2c2 LP |
526 | assert_se(sigemptyset(&mask) >= 0); |
527 | assert_se(sigset_add_many(&mask, SIGINT, SIGTERM, -1) >= 0); | |
528 | assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) >= 0); | |
b9ba604e | 529 | |
1d749d04 ZJS |
530 | signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); |
531 | if (signal_fd < 0) | |
00843602 | 532 | return log_error_errno(errno, "Failed to allocate signal file descriptor: %m"); |
b9ba604e | 533 | |
b9ba604e LP |
534 | pollfd[FD_INOTIFY].fd = notify; |
535 | pollfd[FD_INOTIFY].events = POLLIN; | |
536 | pollfd[FD_SIGNAL].fd = signal_fd; | |
537 | pollfd[FD_SIGNAL].events = POLLIN; | |
ec863ba6 LP |
538 | |
539 | for (;;) { | |
1d749d04 ZJS |
540 | r = show_passwords(); |
541 | if (r < 0) | |
da927ba9 | 542 | log_error_errno(r, "Failed to show password: %m"); |
ec863ba6 | 543 | |
b9ba604e | 544 | if (poll(pollfd, _FD_MAX, -1) < 0) { |
ec863ba6 LP |
545 | if (errno == EINTR) |
546 | continue; | |
547 | ||
1d749d04 | 548 | return -errno; |
ec863ba6 LP |
549 | } |
550 | ||
b9ba604e | 551 | if (pollfd[FD_INOTIFY].revents != 0) |
00843602 | 552 | (void) flush_fd(notify); |
b9ba604e LP |
553 | |
554 | if (pollfd[FD_SIGNAL].revents != 0) | |
555 | break; | |
ec863ba6 LP |
556 | } |
557 | ||
1d749d04 | 558 | return 0; |
ec863ba6 LP |
559 | } |
560 | ||
37ec0fdd LP |
561 | static int help(void) { |
562 | _cleanup_free_ char *link = NULL; | |
563 | int r; | |
564 | ||
565 | r = terminal_urlify_man("systemd-tty-ask-password-agent", "1", &link); | |
566 | if (r < 0) | |
567 | return log_oom(); | |
568 | ||
ec863ba6 LP |
569 | printf("%s [OPTIONS...]\n\n" |
570 | "Process system password requests.\n\n" | |
e5ebf783 | 571 | " -h --help Show this help\n" |
c52f663b | 572 | " --version Show package version\n" |
e5ebf783 LP |
573 | " --list Show pending password requests\n" |
574 | " --query Process pending password requests\n" | |
35b8ca3a HH |
575 | " --watch Continuously process password requests\n" |
576 | " --wall Continuously forward password requests to wall\n" | |
0cf84693 | 577 | " --plymouth Ask question with Plymouth instead of on TTY\n" |
37ec0fdd LP |
578 | " --console Ask question on /dev/console instead of current TTY\n" |
579 | "\nSee the %s for details.\n" | |
580 | , program_invocation_short_name | |
581 | , link | |
582 | ); | |
583 | ||
584 | return 0; | |
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': | |
37ec0fdd | 621 | return help(); |
ec863ba6 | 622 | |
c52f663b | 623 | case ARG_VERSION: |
3f6fd1ba | 624 | return version(); |
c52f663b | 625 | |
ec863ba6 LP |
626 | case ARG_LIST: |
627 | arg_action = ACTION_LIST; | |
628 | break; | |
629 | ||
630 | case ARG_QUERY: | |
631 | arg_action = ACTION_QUERY; | |
632 | break; | |
633 | ||
634 | case ARG_WATCH: | |
635 | arg_action = ACTION_WATCH; | |
636 | break; | |
637 | ||
638 | case ARG_WALL: | |
639 | arg_action = ACTION_WALL; | |
640 | break; | |
641 | ||
e5ebf783 LP |
642 | case ARG_PLYMOUTH: |
643 | arg_plymouth = true; | |
644 | break; | |
645 | ||
0cf84693 LP |
646 | case ARG_CONSOLE: |
647 | arg_console = true; | |
6af62124 WF |
648 | if (optarg) { |
649 | ||
baaa35ad ZJS |
650 | if (isempty(optarg)) |
651 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
652 | "Empty console device path is not allowed."); | |
6af62124 WF |
653 | |
654 | arg_device = optarg; | |
655 | } | |
0cf84693 LP |
656 | break; |
657 | ||
ec863ba6 LP |
658 | case '?': |
659 | return -EINVAL; | |
660 | ||
661 | default: | |
eb9da376 | 662 | assert_not_reached("Unhandled option"); |
ec863ba6 | 663 | } |
ec863ba6 | 664 | |
baaa35ad ZJS |
665 | if (optind != argc) |
666 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
667 | "%s takes no arguments.", program_invocation_short_name); | |
ec863ba6 | 668 | |
6af62124 WF |
669 | if (arg_plymouth || arg_console) { |
670 | ||
baaa35ad ZJS |
671 | if (!IN_SET(arg_action, ACTION_QUERY, ACTION_WATCH)) |
672 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
673 | "Options --query and --watch conflict."); | |
6af62124 | 674 | |
baaa35ad ZJS |
675 | if (arg_plymouth && arg_console) |
676 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
677 | "Options --plymouth and --console conflict."); | |
6af62124 WF |
678 | } |
679 | ||
ec863ba6 LP |
680 | return 1; |
681 | } | |
682 | ||
6af62124 | 683 | /* |
189b0377 LP |
684 | * To be able to ask on all terminal devices of /dev/console the devices are collected. If more than one |
685 | * device is found, then on each of the terminals a inquiring task is forked. Every task has its own session | |
686 | * and its own controlling terminal. If one of the tasks does handle a password, the remaining tasks will be | |
687 | * terminated. | |
6af62124 | 688 | */ |
6e79d2b5 | 689 | static int ask_on_this_console(const char *tty, pid_t *ret_pid, char **arguments) { |
d8502964 | 690 | static const struct sigaction sigchld = { |
6af62124 WF |
691 | .sa_handler = nop_signal_handler, |
692 | .sa_flags = SA_NOCLDSTOP | SA_RESTART, | |
693 | }; | |
d8502964 LP |
694 | static const struct sigaction sighup = { |
695 | .sa_handler = SIG_DFL, | |
696 | .sa_flags = SA_RESTART, | |
697 | }; | |
4c253ed1 | 698 | int r; |
6af62124 | 699 | |
d8502964 LP |
700 | assert_se(sigaction(SIGCHLD, &sigchld, NULL) >= 0); |
701 | assert_se(sigaction(SIGHUP, &sighup, NULL) >= 0); | |
6af62124 WF |
702 | assert_se(sigprocmask_many(SIG_UNBLOCK, NULL, SIGHUP, SIGCHLD, -1) >= 0); |
703 | ||
4bec7f09 | 704 | r = safe_fork("(sd-passwd)", FORK_RESET_SIGNALS|FORK_LOG, ret_pid); |
4c253ed1 | 705 | if (r < 0) |
b6e1fff1 | 706 | return r; |
4c253ed1 | 707 | if (r == 0) { |
ed179fd7 | 708 | char **i; |
6af62124 WF |
709 | |
710 | assert_se(prctl(PR_SET_PDEATHSIG, SIGHUP) >= 0); | |
711 | ||
ed179fd7 LP |
712 | STRV_FOREACH(i, arguments) { |
713 | char *k; | |
714 | ||
715 | if (!streq(*i, "--console")) | |
716 | continue; | |
717 | ||
718 | k = strjoin("--console=", tty); | |
719 | if (!k) { | |
720 | log_oom(); | |
721 | _exit(EXIT_FAILURE); | |
6af62124 | 722 | } |
6af62124 | 723 | |
ed179fd7 LP |
724 | free_and_replace(*i, k); |
725 | } | |
6af62124 | 726 | |
65e5d693 | 727 | execv(SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, arguments); |
6af62124 WF |
728 | _exit(EXIT_FAILURE); |
729 | } | |
4c253ed1 | 730 | |
6af62124 WF |
731 | return 0; |
732 | } | |
733 | ||
734 | static void terminate_agents(Set *pids) { | |
735 | struct timespec ts; | |
736 | siginfo_t status = {}; | |
737 | sigset_t set; | |
738 | Iterator i; | |
739 | void *p; | |
740 | int r, signum; | |
741 | ||
742 | /* | |
743 | * Request termination of the remaining processes as those | |
744 | * are not required anymore. | |
745 | */ | |
746 | SET_FOREACH(p, pids, i) | |
747 | (void) kill(PTR_TO_PID(p), SIGTERM); | |
748 | ||
749 | /* | |
750 | * Collect the processes which have go away. | |
751 | */ | |
752 | assert_se(sigemptyset(&set) >= 0); | |
753 | assert_se(sigaddset(&set, SIGCHLD) >= 0); | |
754 | timespec_store(&ts, 50 * USEC_PER_MSEC); | |
755 | ||
756 | while (!set_isempty(pids)) { | |
757 | ||
758 | zero(status); | |
759 | r = waitid(P_ALL, 0, &status, WEXITED|WNOHANG); | |
760 | if (r < 0 && errno == EINTR) | |
761 | continue; | |
762 | ||
763 | if (r == 0 && status.si_pid > 0) { | |
764 | set_remove(pids, PID_TO_PTR(status.si_pid)); | |
765 | continue; | |
766 | } | |
767 | ||
768 | signum = sigtimedwait(&set, NULL, &ts); | |
769 | if (signum < 0) { | |
770 | if (errno != EAGAIN) | |
771 | log_error_errno(errno, "sigtimedwait() failed: %m"); | |
772 | break; | |
773 | } | |
774 | assert(signum == SIGCHLD); | |
775 | } | |
776 | ||
777 | /* | |
778 | * Kill hanging processes. | |
779 | */ | |
780 | SET_FOREACH(p, pids, i) { | |
781 | log_warning("Failed to terminate child %d, killing it", PTR_TO_PID(p)); | |
782 | (void) kill(PTR_TO_PID(p), SIGKILL); | |
783 | } | |
784 | } | |
785 | ||
ed179fd7 | 786 | static int ask_on_consoles(char *argv[]) { |
6af62124 | 787 | _cleanup_set_free_ Set *pids = NULL; |
6e79d2b5 | 788 | _cleanup_strv_free_ char **consoles = NULL, **arguments = NULL; |
6af62124 WF |
789 | siginfo_t status = {}; |
790 | char **tty; | |
791 | pid_t pid; | |
792 | int r; | |
793 | ||
794 | r = get_kernel_consoles(&consoles); | |
795 | if (r < 0) | |
796 | return log_error_errno(r, "Failed to determine devices of /dev/console: %m"); | |
797 | ||
798 | pids = set_new(NULL); | |
799 | if (!pids) | |
800 | return log_oom(); | |
801 | ||
6e79d2b5 YW |
802 | arguments = strv_copy(argv); |
803 | if (!arguments) | |
804 | return log_oom(); | |
805 | ||
6af62124 WF |
806 | /* Start an agent on each console. */ |
807 | STRV_FOREACH(tty, consoles) { | |
6e79d2b5 | 808 | r = ask_on_this_console(*tty, &pid, arguments); |
6af62124 WF |
809 | if (r < 0) |
810 | return r; | |
811 | ||
812 | if (set_put(pids, PID_TO_PTR(pid)) < 0) | |
813 | return log_oom(); | |
814 | } | |
815 | ||
816 | /* Wait for an agent to exit. */ | |
817 | for (;;) { | |
818 | zero(status); | |
819 | ||
820 | if (waitid(P_ALL, 0, &status, WEXITED) < 0) { | |
821 | if (errno == EINTR) | |
822 | continue; | |
823 | ||
824 | return log_error_errno(errno, "waitid() failed: %m"); | |
825 | } | |
826 | ||
827 | set_remove(pids, PID_TO_PTR(status.si_pid)); | |
828 | break; | |
829 | } | |
830 | ||
1f0958f6 | 831 | if (!is_clean_exit(status.si_code, status.si_status, EXIT_CLEAN_DAEMON, NULL)) |
6af62124 WF |
832 | log_error("Password agent failed with: %d", status.si_status); |
833 | ||
834 | terminate_agents(pids); | |
835 | return 0; | |
836 | } | |
837 | ||
0420d20d | 838 | static int run(int argc, char *argv[]) { |
ec863ba6 LP |
839 | int r; |
840 | ||
6bf3c61c | 841 | log_setup_service(); |
ec863ba6 | 842 | |
4c12626c LP |
843 | umask(0022); |
844 | ||
1d749d04 ZJS |
845 | r = parse_argv(argc, argv); |
846 | if (r <= 0) | |
0420d20d | 847 | return r; |
ec863ba6 | 848 | |
6af62124 WF |
849 | if (arg_console && !arg_device) |
850 | /* | |
0420d20d | 851 | * Spawn a separate process for each console device. |
6af62124 | 852 | */ |
ed179fd7 | 853 | return ask_on_consoles(argv); |
0cf84693 | 854 | |
0420d20d ZJS |
855 | if (arg_device) { |
856 | /* | |
857 | * Later on, a controlling terminal will be acquired, | |
858 | * therefore the current process has to become a session | |
859 | * leader and should not have a controlling terminal already. | |
860 | */ | |
861 | (void) setsid(); | |
862 | (void) release_terminal(); | |
6af62124 | 863 | } |
96707269 | 864 | |
0420d20d ZJS |
865 | if (IN_SET(arg_action, ACTION_WATCH, ACTION_WALL)) |
866 | return watch_passwords(); | |
867 | else | |
868 | return show_passwords(); | |
ec863ba6 | 869 | } |
0420d20d ZJS |
870 | |
871 | DEFINE_MAIN_FUNCTION(run); |