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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 | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
7f4e0805 LP |
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 | |
5430f7f2 | 16 | Lesser General Public License for more details. |
7f4e0805 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
7f4e0805 LP |
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" | |
49e942b2 | 35 | #include "mkdir.h" |
21bc923a | 36 | #include "strv.h" |
7f4e0805 LP |
37 | |
38 | #include "ask-password-api.h" | |
39 | ||
58fc840b LP |
40 | static void backspace_chars(int ttyfd, size_t p) { |
41 | ||
42 | if (ttyfd < 0) | |
43 | return; | |
44 | ||
45 | while (p > 0) { | |
46 | p--; | |
47 | ||
48 | loop_write(ttyfd, "\b \b", 3, false); | |
49 | } | |
50 | } | |
51 | ||
7f4e0805 LP |
52 | int ask_password_tty( |
53 | const char *message, | |
54 | usec_t until, | |
55 | const char *flag_file, | |
56 | char **_passphrase) { | |
57 | ||
58 | struct termios old_termios, new_termios; | |
59 | char passphrase[LINE_MAX]; | |
60 | size_t p = 0; | |
61 | int r, ttyfd = -1, notify = -1; | |
62 | struct pollfd pollfd[2]; | |
63 | bool reset_tty = false; | |
d1676230 | 64 | bool silent_mode = false; |
441dfe09 | 65 | bool dirty = false; |
7f4e0805 LP |
66 | enum { |
67 | POLL_TTY, | |
68 | POLL_INOTIFY | |
69 | }; | |
70 | ||
71 | assert(message); | |
72 | assert(_passphrase); | |
73 | ||
74 | if (flag_file) { | |
75 | if ((notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) { | |
76 | r = -errno; | |
77 | goto finish; | |
78 | } | |
79 | ||
80 | if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) { | |
81 | r = -errno; | |
82 | goto finish; | |
83 | } | |
84 | } | |
85 | ||
86 | if ((ttyfd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC)) >= 0) { | |
87 | ||
88 | if (tcgetattr(ttyfd, &old_termios) < 0) { | |
89 | r = -errno; | |
90 | goto finish; | |
91 | } | |
92 | ||
c1072ea0 | 93 | loop_write(ttyfd, ANSI_HIGHLIGHT_ON, sizeof(ANSI_HIGHLIGHT_ON)-1, false); |
7f4e0805 | 94 | loop_write(ttyfd, message, strlen(message), false); |
bd1db33f | 95 | loop_write(ttyfd, " ", 1, false); |
c1072ea0 | 96 | loop_write(ttyfd, ANSI_HIGHLIGHT_OFF, sizeof(ANSI_HIGHLIGHT_OFF)-1, false); |
7f4e0805 LP |
97 | |
98 | new_termios = old_termios; | |
99 | new_termios.c_lflag &= ~(ICANON|ECHO); | |
100 | new_termios.c_cc[VMIN] = 1; | |
101 | new_termios.c_cc[VTIME] = 0; | |
102 | ||
103 | if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) { | |
104 | r = -errno; | |
105 | goto finish; | |
106 | } | |
107 | ||
108 | reset_tty = true; | |
109 | } | |
110 | ||
111 | zero(pollfd); | |
112 | ||
113 | pollfd[POLL_TTY].fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO; | |
114 | pollfd[POLL_TTY].events = POLLIN; | |
115 | pollfd[POLL_INOTIFY].fd = notify; | |
116 | pollfd[POLL_INOTIFY].events = POLLIN; | |
117 | ||
118 | for (;;) { | |
119 | char c; | |
120 | int sleep_for = -1, k; | |
121 | ssize_t n; | |
122 | ||
123 | if (until > 0) { | |
124 | usec_t y; | |
125 | ||
126 | y = now(CLOCK_MONOTONIC); | |
127 | ||
128 | if (y > until) { | |
7ded2e28 | 129 | r = -ETIME; |
7f4e0805 LP |
130 | goto finish; |
131 | } | |
132 | ||
133 | sleep_for = (int) ((until - y) / USEC_PER_MSEC); | |
134 | } | |
135 | ||
136 | if (flag_file) | |
137 | if (access(flag_file, F_OK) < 0) { | |
138 | r = -errno; | |
139 | goto finish; | |
140 | } | |
141 | ||
142 | if ((k = poll(pollfd, notify > 0 ? 2 : 1, sleep_for)) < 0) { | |
143 | ||
144 | if (errno == EINTR) | |
145 | continue; | |
146 | ||
147 | r = -errno; | |
148 | goto finish; | |
149 | } else if (k == 0) { | |
ccc80078 | 150 | r = -ETIME; |
7f4e0805 LP |
151 | goto finish; |
152 | } | |
153 | ||
154 | if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0) | |
155 | flush_fd(notify); | |
156 | ||
157 | if (pollfd[POLL_TTY].revents == 0) | |
158 | continue; | |
159 | ||
160 | if ((n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1)) < 0) { | |
161 | ||
162 | if (errno == EINTR || errno == EAGAIN) | |
163 | continue; | |
164 | ||
165 | r = -errno; | |
166 | goto finish; | |
167 | ||
168 | } else if (n == 0) | |
169 | break; | |
170 | ||
171 | if (c == '\n') | |
172 | break; | |
58fc840b | 173 | else if (c == 21) { /* C-u */ |
7f4e0805 | 174 | |
58fc840b LP |
175 | if (!silent_mode) |
176 | backspace_chars(ttyfd, p); | |
177 | p = 0; | |
7f4e0805 LP |
178 | |
179 | } else if (c == '\b' || c == 127) { | |
58fc840b LP |
180 | |
181 | if (p > 0) { | |
182 | ||
183 | if (!silent_mode) | |
184 | backspace_chars(ttyfd, 1); | |
185 | ||
7f4e0805 | 186 | p--; |
441dfe09 LP |
187 | } else if (!dirty && !silent_mode) { |
188 | ||
189 | silent_mode = true; | |
190 | ||
191 | /* There are two ways to enter silent | |
192 | * mode. Either by pressing backspace | |
193 | * as first key (and only as first key), | |
194 | * or ... */ | |
195 | if (ttyfd >= 0) | |
196 | loop_write(ttyfd, "(no echo) ", 10, false); | |
197 | ||
58fc840b LP |
198 | } else if (ttyfd >= 0) |
199 | loop_write(ttyfd, "\a", 1, false); | |
7f4e0805 | 200 | |
58fc840b LP |
201 | } else if (c == '\t' && !silent_mode) { |
202 | ||
203 | backspace_chars(ttyfd, p); | |
204 | silent_mode = true; | |
205 | ||
441dfe09 LP |
206 | /* ... or by pressing TAB at any time. */ |
207 | ||
58fc840b LP |
208 | if (ttyfd >= 0) |
209 | loop_write(ttyfd, "(no echo) ", 10, false); | |
7f4e0805 LP |
210 | } else { |
211 | passphrase[p++] = c; | |
212 | ||
d1676230 | 213 | if (!silent_mode && ttyfd >= 0) |
7f4e0805 | 214 | loop_write(ttyfd, "*", 1, false); |
441dfe09 LP |
215 | |
216 | dirty = true; | |
7f4e0805 LP |
217 | } |
218 | } | |
219 | ||
7f4e0805 LP |
220 | passphrase[p] = 0; |
221 | ||
222 | if (!(*_passphrase = strdup(passphrase))) { | |
223 | r = -ENOMEM; | |
224 | goto finish; | |
225 | } | |
226 | ||
227 | r = 0; | |
228 | ||
229 | finish: | |
230 | if (notify >= 0) | |
231 | close_nointr_nofail(notify); | |
232 | ||
233 | if (ttyfd >= 0) { | |
c0f9c7da LP |
234 | |
235 | if (reset_tty) { | |
236 | loop_write(ttyfd, "\n", 1, false); | |
7f4e0805 | 237 | tcsetattr(ttyfd, TCSADRAIN, &old_termios); |
c0f9c7da | 238 | } |
7f4e0805 LP |
239 | |
240 | close_nointr_nofail(ttyfd); | |
241 | } | |
242 | ||
243 | return r; | |
244 | } | |
245 | ||
246 | static int create_socket(char **name) { | |
247 | int fd; | |
248 | union { | |
249 | struct sockaddr sa; | |
250 | struct sockaddr_un un; | |
251 | } sa; | |
252 | int one = 1, r; | |
253 | char *c; | |
1d6702e8 | 254 | mode_t u; |
7f4e0805 LP |
255 | |
256 | assert(name); | |
257 | ||
258 | if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) { | |
259 | log_error("socket() failed: %m"); | |
260 | return -errno; | |
261 | } | |
262 | ||
263 | zero(sa); | |
264 | sa.un.sun_family = AF_UNIX; | |
2b583ce6 | 265 | snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/run/systemd/ask-password/sck.%llu", random_ull()); |
7f4e0805 | 266 | |
1d6702e8 LP |
267 | u = umask(0177); |
268 | r = bind(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)); | |
269 | umask(u); | |
270 | ||
271 | if (r < 0) { | |
7f4e0805 LP |
272 | r = -errno; |
273 | log_error("bind() failed: %m"); | |
274 | goto fail; | |
275 | } | |
276 | ||
277 | if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) { | |
278 | r = -errno; | |
279 | log_error("SO_PASSCRED failed: %m"); | |
280 | goto fail; | |
281 | } | |
282 | ||
283 | if (!(c = strdup(sa.un.sun_path))) { | |
284 | r = -ENOMEM; | |
669241a0 | 285 | log_error("Out of memory."); |
7f4e0805 LP |
286 | goto fail; |
287 | } | |
288 | ||
289 | *name = c; | |
290 | return fd; | |
291 | ||
292 | fail: | |
293 | close_nointr_nofail(fd); | |
294 | ||
295 | return r; | |
296 | } | |
297 | ||
7f4e0805 LP |
298 | int ask_password_agent( |
299 | const char *message, | |
300 | const char *icon, | |
301 | usec_t until, | |
21bc923a LP |
302 | bool accept_cached, |
303 | char ***_passphrases) { | |
7f4e0805 LP |
304 | |
305 | enum { | |
306 | FD_SOCKET, | |
307 | FD_SIGNAL, | |
308 | _FD_MAX | |
309 | }; | |
310 | ||
2b583ce6 | 311 | char temp[] = "/run/systemd/ask-password/tmp.XXXXXX"; |
7f4e0805 LP |
312 | char final[sizeof(temp)] = ""; |
313 | int fd = -1, r; | |
314 | FILE *f = NULL; | |
315 | char *socket_name = NULL; | |
316 | int socket_fd = -1, signal_fd = -1; | |
f9b72cd8 | 317 | sigset_t mask, oldmask; |
7f4e0805 | 318 | struct pollfd pollfd[_FD_MAX]; |
1d6702e8 | 319 | mode_t u; |
7f4e0805 | 320 | |
21bc923a LP |
321 | assert(_passphrases); |
322 | ||
f9b72cd8 LP |
323 | assert_se(sigemptyset(&mask) == 0); |
324 | sigset_add_many(&mask, SIGINT, SIGTERM, -1); | |
325 | assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0); | |
326 | ||
d2e54fae | 327 | mkdir_p_label("/run/systemd/ask-password", 0755); |
7f4e0805 | 328 | |
1d6702e8 LP |
329 | u = umask(0022); |
330 | fd = mkostemp(temp, O_CLOEXEC|O_CREAT|O_WRONLY); | |
331 | umask(u); | |
332 | ||
333 | if (fd < 0) { | |
7f4e0805 LP |
334 | log_error("Failed to create password file: %m"); |
335 | r = -errno; | |
336 | goto finish; | |
337 | } | |
338 | ||
339 | fchmod(fd, 0644); | |
340 | ||
341 | if (!(f = fdopen(fd, "w"))) { | |
342 | log_error("Failed to allocate FILE: %m"); | |
343 | r = -errno; | |
344 | goto finish; | |
345 | } | |
346 | ||
347 | fd = -1; | |
348 | ||
7f4e0805 LP |
349 | if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) { |
350 | log_error("signalfd(): %m"); | |
351 | r = -errno; | |
352 | goto finish; | |
353 | } | |
354 | ||
355 | if ((socket_fd = create_socket(&socket_name)) < 0) { | |
356 | r = socket_fd; | |
357 | goto finish; | |
358 | } | |
359 | ||
360 | fprintf(f, | |
361 | "[Ask]\n" | |
362 | "PID=%lu\n" | |
363 | "Socket=%s\n" | |
21bc923a | 364 | "AcceptCached=%i\n" |
7f4e0805 LP |
365 | "NotAfter=%llu\n", |
366 | (unsigned long) getpid(), | |
367 | socket_name, | |
21bc923a | 368 | accept_cached ? 1 : 0, |
7f4e0805 LP |
369 | (unsigned long long) until); |
370 | ||
371 | if (message) | |
372 | fprintf(f, "Message=%s\n", message); | |
373 | ||
374 | if (icon) | |
375 | fprintf(f, "Icon=%s\n", icon); | |
376 | ||
377 | fflush(f); | |
378 | ||
379 | if (ferror(f)) { | |
380 | log_error("Failed to write query file: %m"); | |
381 | r = -errno; | |
382 | goto finish; | |
383 | } | |
384 | ||
385 | memcpy(final, temp, sizeof(temp)); | |
386 | ||
387 | final[sizeof(final)-11] = 'a'; | |
388 | final[sizeof(final)-10] = 's'; | |
389 | final[sizeof(final)-9] = 'k'; | |
390 | ||
391 | if (rename(temp, final) < 0) { | |
392 | log_error("Failed to rename query file: %m"); | |
393 | r = -errno; | |
394 | goto finish; | |
395 | } | |
396 | ||
397 | zero(pollfd); | |
398 | pollfd[FD_SOCKET].fd = socket_fd; | |
399 | pollfd[FD_SOCKET].events = POLLIN; | |
400 | pollfd[FD_SIGNAL].fd = signal_fd; | |
401 | pollfd[FD_SIGNAL].events = POLLIN; | |
402 | ||
403 | for (;;) { | |
404 | char passphrase[LINE_MAX+1]; | |
405 | struct msghdr msghdr; | |
406 | struct iovec iovec; | |
407 | struct ucred *ucred; | |
408 | union { | |
409 | struct cmsghdr cmsghdr; | |
410 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
411 | } control; | |
412 | ssize_t n; | |
413 | int k; | |
414 | usec_t t; | |
415 | ||
416 | t = now(CLOCK_MONOTONIC); | |
417 | ||
7dcda352 | 418 | if (until > 0 && until <= t) { |
7f4e0805 LP |
419 | log_notice("Timed out"); |
420 | r = -ETIME; | |
421 | goto finish; | |
422 | } | |
423 | ||
7dcda352 | 424 | if ((k = poll(pollfd, _FD_MAX, until > 0 ? (int) ((until-t)/USEC_PER_MSEC) : -1)) < 0) { |
7f4e0805 LP |
425 | |
426 | if (errno == EINTR) | |
427 | continue; | |
428 | ||
429 | log_error("poll() failed: %m"); | |
430 | r = -errno; | |
431 | goto finish; | |
432 | } | |
433 | ||
434 | if (k <= 0) { | |
435 | log_notice("Timed out"); | |
436 | r = -ETIME; | |
437 | goto finish; | |
438 | } | |
439 | ||
21bc923a LP |
440 | if (pollfd[FD_SIGNAL].revents & POLLIN) { |
441 | r = -EINTR; | |
442 | goto finish; | |
443 | } | |
7f4e0805 LP |
444 | |
445 | if (pollfd[FD_SOCKET].revents != POLLIN) { | |
446 | log_error("Unexpected poll() event."); | |
447 | r = -EIO; | |
448 | goto finish; | |
449 | } | |
450 | ||
451 | zero(iovec); | |
452 | iovec.iov_base = passphrase; | |
21bc923a | 453 | iovec.iov_len = sizeof(passphrase); |
7f4e0805 LP |
454 | |
455 | zero(control); | |
456 | zero(msghdr); | |
457 | msghdr.msg_iov = &iovec; | |
458 | msghdr.msg_iovlen = 1; | |
459 | msghdr.msg_control = &control; | |
460 | msghdr.msg_controllen = sizeof(control); | |
461 | ||
462 | if ((n = recvmsg(socket_fd, &msghdr, 0)) < 0) { | |
463 | ||
464 | if (errno == EAGAIN || | |
465 | errno == EINTR) | |
466 | continue; | |
467 | ||
468 | log_error("recvmsg() failed: %m"); | |
469 | r = -errno; | |
470 | goto finish; | |
471 | } | |
472 | ||
473 | if (n <= 0) { | |
474 | log_error("Message too short"); | |
475 | continue; | |
476 | } | |
477 | ||
478 | if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) || | |
479 | control.cmsghdr.cmsg_level != SOL_SOCKET || | |
480 | control.cmsghdr.cmsg_type != SCM_CREDENTIALS || | |
481 | control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) { | |
482 | log_warning("Received message without credentials. Ignoring."); | |
483 | continue; | |
484 | } | |
485 | ||
486 | ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr); | |
487 | if (ucred->uid != 0) { | |
488 | log_warning("Got request from unprivileged user. Ignoring."); | |
489 | continue; | |
490 | } | |
491 | ||
492 | if (passphrase[0] == '+') { | |
21bc923a | 493 | char **l; |
7f4e0805 | 494 | |
8254a475 LP |
495 | if (n == 1) |
496 | l = strv_new("", NULL); | |
497 | else | |
498 | l = strv_parse_nulstr(passphrase+1, n-1); | |
499 | /* An empty message refers to the empty password */ | |
500 | ||
501 | if (!l) { | |
7f4e0805 LP |
502 | r = -ENOMEM; |
503 | goto finish; | |
504 | } | |
505 | ||
21bc923a LP |
506 | if (strv_length(l) <= 0) { |
507 | strv_free(l); | |
508 | log_error("Invalid packet"); | |
509 | continue; | |
510 | } | |
511 | ||
512 | *_passphrases = l; | |
513 | ||
7f4e0805 LP |
514 | } else if (passphrase[0] == '-') { |
515 | r = -ECANCELED; | |
516 | goto finish; | |
517 | } else { | |
518 | log_error("Invalid packet"); | |
519 | continue; | |
520 | } | |
521 | ||
522 | break; | |
523 | } | |
524 | ||
525 | r = 0; | |
526 | ||
527 | finish: | |
528 | if (fd >= 0) | |
529 | close_nointr_nofail(fd); | |
530 | ||
531 | if (socket_name) { | |
532 | unlink(socket_name); | |
533 | free(socket_name); | |
534 | } | |
535 | ||
536 | if (socket_fd >= 0) | |
537 | close_nointr_nofail(socket_fd); | |
538 | ||
539 | if (signal_fd >= 0) | |
540 | close_nointr_nofail(signal_fd); | |
541 | ||
542 | if (f) | |
543 | fclose(f); | |
544 | ||
545 | unlink(temp); | |
546 | ||
547 | if (final[0]) | |
548 | unlink(final); | |
549 | ||
f9b72cd8 LP |
550 | assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0); |
551 | ||
7f4e0805 LP |
552 | return r; |
553 | } | |
260ab287 | 554 | |
21bc923a | 555 | int ask_password_auto(const char *message, const char *icon, usec_t until, bool accept_cached, char ***_passphrases) { |
260ab287 | 556 | assert(message); |
21bc923a LP |
557 | assert(_passphrases); |
558 | ||
559 | if (isatty(STDIN_FILENO)) { | |
560 | int r; | |
561 | char *s = NULL, **l = NULL; | |
562 | ||
563 | if ((r = ask_password_tty(message, until, NULL, &s)) < 0) | |
564 | return r; | |
565 | ||
566 | l = strv_new(s, NULL); | |
567 | free(s); | |
568 | ||
569 | if (!l) | |
570 | return -ENOMEM; | |
571 | ||
572 | *_passphrases = l; | |
573 | return r; | |
260ab287 | 574 | |
21bc923a LP |
575 | } else |
576 | return ask_password_agent(message, icon, until, accept_cached, _passphrases); | |
260ab287 | 577 | } |