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Commit | Line | Data |
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7f4e0805 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
d1676230 | 21 | #include <stdbool.h> |
7f4e0805 LP |
22 | #include <termios.h> |
23 | #include <unistd.h> | |
24 | #include <sys/poll.h> | |
25 | #include <sys/inotify.h> | |
26 | #include <errno.h> | |
27 | #include <fcntl.h> | |
28 | #include <sys/socket.h> | |
29 | #include <string.h> | |
30 | #include <sys/un.h> | |
31 | #include <stddef.h> | |
32 | #include <sys/signalfd.h> | |
33 | ||
34 | #include "util.h" | |
21bc923a | 35 | #include "strv.h" |
7f4e0805 LP |
36 | |
37 | #include "ask-password-api.h" | |
38 | ||
58fc840b LP |
39 | static void backspace_chars(int ttyfd, size_t p) { |
40 | ||
41 | if (ttyfd < 0) | |
42 | return; | |
43 | ||
44 | while (p > 0) { | |
45 | p--; | |
46 | ||
47 | loop_write(ttyfd, "\b \b", 3, false); | |
48 | } | |
49 | } | |
50 | ||
7f4e0805 LP |
51 | int ask_password_tty( |
52 | const char *message, | |
53 | usec_t until, | |
54 | const char *flag_file, | |
55 | char **_passphrase) { | |
56 | ||
57 | struct termios old_termios, new_termios; | |
58 | char passphrase[LINE_MAX]; | |
59 | size_t p = 0; | |
60 | int r, ttyfd = -1, notify = -1; | |
61 | struct pollfd pollfd[2]; | |
62 | bool reset_tty = false; | |
d1676230 | 63 | bool silent_mode = false; |
441dfe09 | 64 | bool dirty = false; |
7f4e0805 LP |
65 | enum { |
66 | POLL_TTY, | |
67 | POLL_INOTIFY | |
68 | }; | |
69 | ||
70 | assert(message); | |
71 | assert(_passphrase); | |
72 | ||
73 | if (flag_file) { | |
74 | if ((notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) { | |
75 | r = -errno; | |
76 | goto finish; | |
77 | } | |
78 | ||
79 | if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) { | |
80 | r = -errno; | |
81 | goto finish; | |
82 | } | |
83 | } | |
84 | ||
85 | if ((ttyfd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC)) >= 0) { | |
86 | ||
87 | if (tcgetattr(ttyfd, &old_termios) < 0) { | |
88 | r = -errno; | |
89 | goto finish; | |
90 | } | |
91 | ||
92 | loop_write(ttyfd, "\x1B[1m", 4, false); | |
93 | loop_write(ttyfd, message, strlen(message), false); | |
bd1db33f | 94 | loop_write(ttyfd, " ", 1, false); |
7f4e0805 LP |
95 | loop_write(ttyfd, "\x1B[0m", 4, false); |
96 | ||
97 | new_termios = old_termios; | |
98 | new_termios.c_lflag &= ~(ICANON|ECHO); | |
99 | new_termios.c_cc[VMIN] = 1; | |
100 | new_termios.c_cc[VTIME] = 0; | |
101 | ||
102 | if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) { | |
103 | r = -errno; | |
104 | goto finish; | |
105 | } | |
106 | ||
107 | reset_tty = true; | |
108 | } | |
109 | ||
110 | zero(pollfd); | |
111 | ||
112 | pollfd[POLL_TTY].fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO; | |
113 | pollfd[POLL_TTY].events = POLLIN; | |
114 | pollfd[POLL_INOTIFY].fd = notify; | |
115 | pollfd[POLL_INOTIFY].events = POLLIN; | |
116 | ||
117 | for (;;) { | |
118 | char c; | |
119 | int sleep_for = -1, k; | |
120 | ssize_t n; | |
121 | ||
122 | if (until > 0) { | |
123 | usec_t y; | |
124 | ||
125 | y = now(CLOCK_MONOTONIC); | |
126 | ||
127 | if (y > until) { | |
7ded2e28 | 128 | r = -ETIME; |
7f4e0805 LP |
129 | goto finish; |
130 | } | |
131 | ||
132 | sleep_for = (int) ((until - y) / USEC_PER_MSEC); | |
133 | } | |
134 | ||
135 | if (flag_file) | |
136 | if (access(flag_file, F_OK) < 0) { | |
137 | r = -errno; | |
138 | goto finish; | |
139 | } | |
140 | ||
141 | if ((k = poll(pollfd, notify > 0 ? 2 : 1, sleep_for)) < 0) { | |
142 | ||
143 | if (errno == EINTR) | |
144 | continue; | |
145 | ||
146 | r = -errno; | |
147 | goto finish; | |
148 | } else if (k == 0) { | |
ccc80078 | 149 | r = -ETIME; |
7f4e0805 LP |
150 | goto finish; |
151 | } | |
152 | ||
153 | if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0) | |
154 | flush_fd(notify); | |
155 | ||
156 | if (pollfd[POLL_TTY].revents == 0) | |
157 | continue; | |
158 | ||
159 | if ((n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1)) < 0) { | |
160 | ||
161 | if (errno == EINTR || errno == EAGAIN) | |
162 | continue; | |
163 | ||
164 | r = -errno; | |
165 | goto finish; | |
166 | ||
167 | } else if (n == 0) | |
168 | break; | |
169 | ||
170 | if (c == '\n') | |
171 | break; | |
58fc840b | 172 | else if (c == 21) { /* C-u */ |
7f4e0805 | 173 | |
58fc840b LP |
174 | if (!silent_mode) |
175 | backspace_chars(ttyfd, p); | |
176 | p = 0; | |
7f4e0805 LP |
177 | |
178 | } else if (c == '\b' || c == 127) { | |
58fc840b LP |
179 | |
180 | if (p > 0) { | |
181 | ||
182 | if (!silent_mode) | |
183 | backspace_chars(ttyfd, 1); | |
184 | ||
7f4e0805 | 185 | p--; |
441dfe09 LP |
186 | } else if (!dirty && !silent_mode) { |
187 | ||
188 | silent_mode = true; | |
189 | ||
190 | /* There are two ways to enter silent | |
191 | * mode. Either by pressing backspace | |
192 | * as first key (and only as first key), | |
193 | * or ... */ | |
194 | if (ttyfd >= 0) | |
195 | loop_write(ttyfd, "(no echo) ", 10, false); | |
196 | ||
58fc840b LP |
197 | } else if (ttyfd >= 0) |
198 | loop_write(ttyfd, "\a", 1, false); | |
7f4e0805 | 199 | |
58fc840b LP |
200 | } else if (c == '\t' && !silent_mode) { |
201 | ||
202 | backspace_chars(ttyfd, p); | |
203 | silent_mode = true; | |
204 | ||
441dfe09 LP |
205 | /* ... or by pressing TAB at any time. */ |
206 | ||
58fc840b LP |
207 | if (ttyfd >= 0) |
208 | loop_write(ttyfd, "(no echo) ", 10, false); | |
7f4e0805 LP |
209 | } else { |
210 | passphrase[p++] = c; | |
211 | ||
d1676230 | 212 | if (!silent_mode && ttyfd >= 0) |
7f4e0805 | 213 | loop_write(ttyfd, "*", 1, false); |
441dfe09 LP |
214 | |
215 | dirty = true; | |
7f4e0805 LP |
216 | } |
217 | } | |
218 | ||
7f4e0805 LP |
219 | passphrase[p] = 0; |
220 | ||
221 | if (!(*_passphrase = strdup(passphrase))) { | |
222 | r = -ENOMEM; | |
223 | goto finish; | |
224 | } | |
225 | ||
226 | r = 0; | |
227 | ||
228 | finish: | |
229 | if (notify >= 0) | |
230 | close_nointr_nofail(notify); | |
231 | ||
232 | if (ttyfd >= 0) { | |
c0f9c7da LP |
233 | |
234 | if (reset_tty) { | |
235 | loop_write(ttyfd, "\n", 1, false); | |
7f4e0805 | 236 | tcsetattr(ttyfd, TCSADRAIN, &old_termios); |
c0f9c7da | 237 | } |
7f4e0805 LP |
238 | |
239 | close_nointr_nofail(ttyfd); | |
240 | } | |
241 | ||
242 | return r; | |
243 | } | |
244 | ||
245 | static int create_socket(char **name) { | |
246 | int fd; | |
247 | union { | |
248 | struct sockaddr sa; | |
249 | struct sockaddr_un un; | |
250 | } sa; | |
251 | int one = 1, r; | |
252 | char *c; | |
1d6702e8 | 253 | mode_t u; |
7f4e0805 LP |
254 | |
255 | assert(name); | |
256 | ||
257 | if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) { | |
258 | log_error("socket() failed: %m"); | |
259 | return -errno; | |
260 | } | |
261 | ||
262 | zero(sa); | |
263 | sa.un.sun_family = AF_UNIX; | |
2b583ce6 | 264 | snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/run/systemd/ask-password/sck.%llu", random_ull()); |
7f4e0805 | 265 | |
1d6702e8 LP |
266 | u = umask(0177); |
267 | r = bind(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)); | |
268 | umask(u); | |
269 | ||
270 | if (r < 0) { | |
7f4e0805 LP |
271 | r = -errno; |
272 | log_error("bind() failed: %m"); | |
273 | goto fail; | |
274 | } | |
275 | ||
276 | if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) { | |
277 | r = -errno; | |
278 | log_error("SO_PASSCRED failed: %m"); | |
279 | goto fail; | |
280 | } | |
281 | ||
282 | if (!(c = strdup(sa.un.sun_path))) { | |
283 | r = -ENOMEM; | |
284 | log_error("Out of memory"); | |
285 | goto fail; | |
286 | } | |
287 | ||
288 | *name = c; | |
289 | return fd; | |
290 | ||
291 | fail: | |
292 | close_nointr_nofail(fd); | |
293 | ||
294 | return r; | |
295 | } | |
296 | ||
7f4e0805 LP |
297 | int ask_password_agent( |
298 | const char *message, | |
299 | const char *icon, | |
300 | usec_t until, | |
21bc923a LP |
301 | bool accept_cached, |
302 | char ***_passphrases) { | |
7f4e0805 LP |
303 | |
304 | enum { | |
305 | FD_SOCKET, | |
306 | FD_SIGNAL, | |
307 | _FD_MAX | |
308 | }; | |
309 | ||
2b583ce6 | 310 | char temp[] = "/run/systemd/ask-password/tmp.XXXXXX"; |
7f4e0805 LP |
311 | char final[sizeof(temp)] = ""; |
312 | int fd = -1, r; | |
313 | FILE *f = NULL; | |
314 | char *socket_name = NULL; | |
315 | int socket_fd = -1, signal_fd = -1; | |
f9b72cd8 | 316 | sigset_t mask, oldmask; |
7f4e0805 | 317 | struct pollfd pollfd[_FD_MAX]; |
1d6702e8 | 318 | mode_t u; |
7f4e0805 | 319 | |
21bc923a LP |
320 | assert(_passphrases); |
321 | ||
f9b72cd8 LP |
322 | assert_se(sigemptyset(&mask) == 0); |
323 | sigset_add_many(&mask, SIGINT, SIGTERM, -1); | |
324 | assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0); | |
325 | ||
2b583ce6 | 326 | mkdir_p("/run/systemd/ask-password", 0755); |
7f4e0805 | 327 | |
1d6702e8 LP |
328 | u = umask(0022); |
329 | fd = mkostemp(temp, O_CLOEXEC|O_CREAT|O_WRONLY); | |
330 | umask(u); | |
331 | ||
332 | if (fd < 0) { | |
7f4e0805 LP |
333 | log_error("Failed to create password file: %m"); |
334 | r = -errno; | |
335 | goto finish; | |
336 | } | |
337 | ||
338 | fchmod(fd, 0644); | |
339 | ||
340 | if (!(f = fdopen(fd, "w"))) { | |
341 | log_error("Failed to allocate FILE: %m"); | |
342 | r = -errno; | |
343 | goto finish; | |
344 | } | |
345 | ||
346 | fd = -1; | |
347 | ||
7f4e0805 LP |
348 | if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) { |
349 | log_error("signalfd(): %m"); | |
350 | r = -errno; | |
351 | goto finish; | |
352 | } | |
353 | ||
354 | if ((socket_fd = create_socket(&socket_name)) < 0) { | |
355 | r = socket_fd; | |
356 | goto finish; | |
357 | } | |
358 | ||
359 | fprintf(f, | |
360 | "[Ask]\n" | |
361 | "PID=%lu\n" | |
362 | "Socket=%s\n" | |
21bc923a | 363 | "AcceptCached=%i\n" |
7f4e0805 LP |
364 | "NotAfter=%llu\n", |
365 | (unsigned long) getpid(), | |
366 | socket_name, | |
21bc923a | 367 | accept_cached ? 1 : 0, |
7f4e0805 LP |
368 | (unsigned long long) until); |
369 | ||
370 | if (message) | |
371 | fprintf(f, "Message=%s\n", message); | |
372 | ||
373 | if (icon) | |
374 | fprintf(f, "Icon=%s\n", icon); | |
375 | ||
376 | fflush(f); | |
377 | ||
378 | if (ferror(f)) { | |
379 | log_error("Failed to write query file: %m"); | |
380 | r = -errno; | |
381 | goto finish; | |
382 | } | |
383 | ||
384 | memcpy(final, temp, sizeof(temp)); | |
385 | ||
386 | final[sizeof(final)-11] = 'a'; | |
387 | final[sizeof(final)-10] = 's'; | |
388 | final[sizeof(final)-9] = 'k'; | |
389 | ||
390 | if (rename(temp, final) < 0) { | |
391 | log_error("Failed to rename query file: %m"); | |
392 | r = -errno; | |
393 | goto finish; | |
394 | } | |
395 | ||
396 | zero(pollfd); | |
397 | pollfd[FD_SOCKET].fd = socket_fd; | |
398 | pollfd[FD_SOCKET].events = POLLIN; | |
399 | pollfd[FD_SIGNAL].fd = signal_fd; | |
400 | pollfd[FD_SIGNAL].events = POLLIN; | |
401 | ||
402 | for (;;) { | |
403 | char passphrase[LINE_MAX+1]; | |
404 | struct msghdr msghdr; | |
405 | struct iovec iovec; | |
406 | struct ucred *ucred; | |
407 | union { | |
408 | struct cmsghdr cmsghdr; | |
409 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
410 | } control; | |
411 | ssize_t n; | |
412 | int k; | |
413 | usec_t t; | |
414 | ||
415 | t = now(CLOCK_MONOTONIC); | |
416 | ||
7dcda352 | 417 | if (until > 0 && until <= t) { |
7f4e0805 LP |
418 | log_notice("Timed out"); |
419 | r = -ETIME; | |
420 | goto finish; | |
421 | } | |
422 | ||
7dcda352 | 423 | if ((k = poll(pollfd, _FD_MAX, until > 0 ? (int) ((until-t)/USEC_PER_MSEC) : -1)) < 0) { |
7f4e0805 LP |
424 | |
425 | if (errno == EINTR) | |
426 | continue; | |
427 | ||
428 | log_error("poll() failed: %m"); | |
429 | r = -errno; | |
430 | goto finish; | |
431 | } | |
432 | ||
433 | if (k <= 0) { | |
434 | log_notice("Timed out"); | |
435 | r = -ETIME; | |
436 | goto finish; | |
437 | } | |
438 | ||
21bc923a LP |
439 | if (pollfd[FD_SIGNAL].revents & POLLIN) { |
440 | r = -EINTR; | |
441 | goto finish; | |
442 | } | |
7f4e0805 LP |
443 | |
444 | if (pollfd[FD_SOCKET].revents != POLLIN) { | |
445 | log_error("Unexpected poll() event."); | |
446 | r = -EIO; | |
447 | goto finish; | |
448 | } | |
449 | ||
450 | zero(iovec); | |
451 | iovec.iov_base = passphrase; | |
21bc923a | 452 | iovec.iov_len = sizeof(passphrase); |
7f4e0805 LP |
453 | |
454 | zero(control); | |
455 | zero(msghdr); | |
456 | msghdr.msg_iov = &iovec; | |
457 | msghdr.msg_iovlen = 1; | |
458 | msghdr.msg_control = &control; | |
459 | msghdr.msg_controllen = sizeof(control); | |
460 | ||
461 | if ((n = recvmsg(socket_fd, &msghdr, 0)) < 0) { | |
462 | ||
463 | if (errno == EAGAIN || | |
464 | errno == EINTR) | |
465 | continue; | |
466 | ||
467 | log_error("recvmsg() failed: %m"); | |
468 | r = -errno; | |
469 | goto finish; | |
470 | } | |
471 | ||
472 | if (n <= 0) { | |
473 | log_error("Message too short"); | |
474 | continue; | |
475 | } | |
476 | ||
477 | if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) || | |
478 | control.cmsghdr.cmsg_level != SOL_SOCKET || | |
479 | control.cmsghdr.cmsg_type != SCM_CREDENTIALS || | |
480 | control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) { | |
481 | log_warning("Received message without credentials. Ignoring."); | |
482 | continue; | |
483 | } | |
484 | ||
485 | ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr); | |
486 | if (ucred->uid != 0) { | |
487 | log_warning("Got request from unprivileged user. Ignoring."); | |
488 | continue; | |
489 | } | |
490 | ||
491 | if (passphrase[0] == '+') { | |
21bc923a | 492 | char **l; |
7f4e0805 | 493 | |
8254a475 LP |
494 | if (n == 1) |
495 | l = strv_new("", NULL); | |
496 | else | |
497 | l = strv_parse_nulstr(passphrase+1, n-1); | |
498 | /* An empty message refers to the empty password */ | |
499 | ||
500 | if (!l) { | |
7f4e0805 LP |
501 | r = -ENOMEM; |
502 | goto finish; | |
503 | } | |
504 | ||
21bc923a LP |
505 | if (strv_length(l) <= 0) { |
506 | strv_free(l); | |
507 | log_error("Invalid packet"); | |
508 | continue; | |
509 | } | |
510 | ||
511 | *_passphrases = l; | |
512 | ||
7f4e0805 LP |
513 | } else if (passphrase[0] == '-') { |
514 | r = -ECANCELED; | |
515 | goto finish; | |
516 | } else { | |
517 | log_error("Invalid packet"); | |
518 | continue; | |
519 | } | |
520 | ||
521 | break; | |
522 | } | |
523 | ||
524 | r = 0; | |
525 | ||
526 | finish: | |
527 | if (fd >= 0) | |
528 | close_nointr_nofail(fd); | |
529 | ||
530 | if (socket_name) { | |
531 | unlink(socket_name); | |
532 | free(socket_name); | |
533 | } | |
534 | ||
535 | if (socket_fd >= 0) | |
536 | close_nointr_nofail(socket_fd); | |
537 | ||
538 | if (signal_fd >= 0) | |
539 | close_nointr_nofail(signal_fd); | |
540 | ||
541 | if (f) | |
542 | fclose(f); | |
543 | ||
544 | unlink(temp); | |
545 | ||
546 | if (final[0]) | |
547 | unlink(final); | |
548 | ||
f9b72cd8 LP |
549 | assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0); |
550 | ||
7f4e0805 LP |
551 | return r; |
552 | } | |
260ab287 | 553 | |
21bc923a | 554 | int ask_password_auto(const char *message, const char *icon, usec_t until, bool accept_cached, char ***_passphrases) { |
260ab287 | 555 | assert(message); |
21bc923a LP |
556 | assert(_passphrases); |
557 | ||
558 | if (isatty(STDIN_FILENO)) { | |
559 | int r; | |
560 | char *s = NULL, **l = NULL; | |
561 | ||
562 | if ((r = ask_password_tty(message, until, NULL, &s)) < 0) | |
563 | return r; | |
564 | ||
565 | l = strv_new(s, NULL); | |
566 | free(s); | |
567 | ||
568 | if (!l) | |
569 | return -ENOMEM; | |
570 | ||
571 | *_passphrases = l; | |
572 | return r; | |
260ab287 | 573 | |
21bc923a LP |
574 | } else |
575 | return ask_password_agent(message, icon, until, accept_cached, _passphrases); | |
260ab287 | 576 | } |