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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
7f4e0805 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
8 | under the terms of the GNU Lesser General Public License as published by |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
7f4e0805 LP |
10 | (at your option) any later version. |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 15 | Lesser General Public License for more details. |
7f4e0805 | 16 | |
5430f7f2 | 17 | You should have received a copy of the GNU Lesser General Public License |
7f4e0805 LP |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
19 | ***/ | |
00843602 | 20 | |
7f4e0805 LP |
21 | #include <errno.h> |
22 | #include <fcntl.h> | |
a8fbdf54 TA |
23 | #include <inttypes.h> |
24 | #include <limits.h> | |
00843602 | 25 | #include <poll.h> |
a8fbdf54 | 26 | #include <signal.h> |
00843602 | 27 | #include <stdbool.h> |
7f4e0805 | 28 | #include <stddef.h> |
a8fbdf54 TA |
29 | #include <stdint.h> |
30 | #include <stdio.h> | |
31 | #include <stdlib.h> | |
00843602 LP |
32 | #include <string.h> |
33 | #include <sys/inotify.h> | |
7f4e0805 | 34 | #include <sys/signalfd.h> |
00843602 | 35 | #include <sys/socket.h> |
a8fbdf54 TA |
36 | #include <sys/stat.h> |
37 | #include <sys/time.h> | |
38 | #include <sys/uio.h> | |
00843602 LP |
39 | #include <sys/un.h> |
40 | #include <termios.h> | |
41 | #include <unistd.h> | |
7f4e0805 | 42 | |
b5efdb8a | 43 | #include "alloc-util.h" |
3ffd4af2 LP |
44 | #include "ask-password-api.h" |
45 | #include "fd-util.h" | |
0d39fa9c | 46 | #include "fileio.h" |
f97b34a6 | 47 | #include "format-util.h" |
c004493c | 48 | #include "io-util.h" |
a8fbdf54 TA |
49 | #include "log.h" |
50 | #include "macro.h" | |
e287086b | 51 | #include "missing.h" |
49e942b2 | 52 | #include "mkdir.h" |
df0ff127 | 53 | #include "process-util.h" |
3df3e884 | 54 | #include "random-util.h" |
24882e06 | 55 | #include "signal-util.h" |
00843602 | 56 | #include "socket-util.h" |
07630cea | 57 | #include "string-util.h" |
00843602 LP |
58 | #include "strv.h" |
59 | #include "terminal-util.h" | |
a8fbdf54 | 60 | #include "time-util.h" |
affb60b1 | 61 | #include "umask-util.h" |
f3149d57 | 62 | #include "utf8.h" |
00843602 | 63 | #include "util.h" |
7f4e0805 | 64 | |
e287086b LP |
65 | #define KEYRING_TIMEOUT_USEC ((5 * USEC_PER_MINUTE) / 2) |
66 | ||
67 | static int lookup_key(const char *keyname, key_serial_t *ret) { | |
68 | key_serial_t serial; | |
69 | ||
70 | assert(keyname); | |
71 | assert(ret); | |
72 | ||
73 | serial = request_key("user", keyname, NULL, 0); | |
74 | if (serial == -1) | |
9c4615fb | 75 | return negative_errno(); |
e287086b LP |
76 | |
77 | *ret = serial; | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static int retrieve_key(key_serial_t serial, char ***ret) { | |
82 | _cleanup_free_ char *p = NULL; | |
83 | long m = 100, n; | |
84 | char **l; | |
85 | ||
86 | assert(ret); | |
87 | ||
88 | for (;;) { | |
89 | p = new(char, m); | |
90 | if (!p) | |
91 | return -ENOMEM; | |
92 | ||
93 | n = keyctl(KEYCTL_READ, (unsigned long) serial, (unsigned long) p, (unsigned long) m, 0); | |
94 | if (n < 0) | |
95 | return -errno; | |
96 | ||
97 | if (n < m) | |
98 | break; | |
99 | ||
2d26d8e0 | 100 | explicit_bzero(p, n); |
e287086b LP |
101 | free(p); |
102 | m *= 2; | |
103 | } | |
104 | ||
105 | l = strv_parse_nulstr(p, n); | |
106 | if (!l) | |
107 | return -ENOMEM; | |
108 | ||
2d26d8e0 | 109 | explicit_bzero(p, n); |
1602b008 | 110 | |
e287086b LP |
111 | *ret = l; |
112 | return 0; | |
113 | } | |
114 | ||
115 | static int add_to_keyring(const char *keyname, AskPasswordFlags flags, char **passwords) { | |
ab84f5b9 | 116 | _cleanup_strv_free_erase_ char **l = NULL; |
e287086b LP |
117 | _cleanup_free_ char *p = NULL; |
118 | key_serial_t serial; | |
119 | size_t n; | |
120 | int r; | |
121 | ||
122 | assert(keyname); | |
123 | assert(passwords); | |
124 | ||
125 | if (!(flags & ASK_PASSWORD_PUSH_CACHE)) | |
126 | return 0; | |
127 | ||
128 | r = lookup_key(keyname, &serial); | |
129 | if (r >= 0) { | |
130 | r = retrieve_key(serial, &l); | |
131 | if (r < 0) | |
132 | return r; | |
133 | } else if (r != -ENOKEY) | |
134 | return r; | |
135 | ||
136 | r = strv_extend_strv(&l, passwords, true); | |
137 | if (r <= 0) | |
138 | return r; | |
139 | ||
140 | r = strv_make_nulstr(l, &p, &n); | |
141 | if (r < 0) | |
142 | return r; | |
143 | ||
b60df13b | 144 | serial = add_key("user", keyname, p, n, KEY_SPEC_USER_KEYRING); |
2d26d8e0 | 145 | explicit_bzero(p, n); |
e287086b LP |
146 | if (serial == -1) |
147 | return -errno; | |
148 | ||
149 | if (keyctl(KEYCTL_SET_TIMEOUT, | |
150 | (unsigned long) serial, | |
151 | (unsigned long) DIV_ROUND_UP(KEYRING_TIMEOUT_USEC, USEC_PER_SEC), 0, 0) < 0) | |
152 | log_debug_errno(errno, "Failed to adjust timeout: %m"); | |
153 | ||
154 | log_debug("Added key to keyring as %" PRIi32 ".", serial); | |
155 | ||
156 | return 1; | |
157 | } | |
158 | ||
159 | static int add_to_keyring_and_log(const char *keyname, AskPasswordFlags flags, char **passwords) { | |
160 | int r; | |
161 | ||
162 | assert(keyname); | |
163 | assert(passwords); | |
164 | ||
165 | r = add_to_keyring(keyname, flags, passwords); | |
166 | if (r < 0) | |
167 | return log_debug_errno(r, "Failed to add password to keyring: %m"); | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | int ask_password_keyring(const char *keyname, AskPasswordFlags flags, char ***ret) { | |
173 | ||
174 | key_serial_t serial; | |
175 | int r; | |
176 | ||
177 | assert(keyname); | |
178 | assert(ret); | |
179 | ||
180 | if (!(flags & ASK_PASSWORD_ACCEPT_CACHED)) | |
181 | return -EUNATCH; | |
182 | ||
183 | r = lookup_key(keyname, &serial); | |
184 | if (r == -ENOSYS) /* when retrieving the distinction doesn't matter */ | |
185 | return -ENOKEY; | |
186 | if (r < 0) | |
187 | return r; | |
188 | ||
189 | return retrieve_key(serial, ret); | |
190 | } | |
191 | ||
58fc840b LP |
192 | static void backspace_chars(int ttyfd, size_t p) { |
193 | ||
194 | if (ttyfd < 0) | |
195 | return; | |
196 | ||
197 | while (p > 0) { | |
198 | p--; | |
199 | ||
200 | loop_write(ttyfd, "\b \b", 3, false); | |
201 | } | |
202 | } | |
203 | ||
7f4e0805 LP |
204 | int ask_password_tty( |
205 | const char *message, | |
e287086b | 206 | const char *keyname, |
7f4e0805 | 207 | usec_t until, |
e287086b | 208 | AskPasswordFlags flags, |
7f4e0805 | 209 | const char *flag_file, |
e287086b | 210 | char **ret) { |
7f4e0805 | 211 | |
088dcd8e LP |
212 | enum { |
213 | POLL_TTY, | |
214 | POLL_INOTIFY, | |
215 | _POLL_MAX, | |
216 | }; | |
217 | ||
218 | _cleanup_close_ int ttyfd = -1, notify = -1; | |
7f4e0805 | 219 | struct termios old_termios, new_termios; |
f3149d57 | 220 | char passphrase[LINE_MAX + 1] = {}, *x; |
088dcd8e | 221 | struct pollfd pollfd[_POLL_MAX]; |
f3149d57 | 222 | size_t p = 0, codepoint = 0; |
7f4e0805 | 223 | bool reset_tty = false; |
441dfe09 | 224 | bool dirty = false; |
088dcd8e | 225 | int r; |
7f4e0805 | 226 | |
e287086b LP |
227 | assert(ret); |
228 | ||
229 | if (flags & ASK_PASSWORD_NO_TTY) | |
230 | return -EUNATCH; | |
231 | ||
232 | if (!message) | |
233 | message = "Password:"; | |
7f4e0805 LP |
234 | |
235 | if (flag_file) { | |
981e4cd3 | 236 | notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK); |
a497a296 LP |
237 | if (notify < 0) |
238 | return -errno; | |
239 | ||
240 | if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) | |
241 | return -errno; | |
7f4e0805 LP |
242 | } |
243 | ||
981e4cd3 LP |
244 | ttyfd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC); |
245 | if (ttyfd >= 0) { | |
7f4e0805 | 246 | |
a497a296 LP |
247 | if (tcgetattr(ttyfd, &old_termios) < 0) |
248 | return -errno; | |
7f4e0805 | 249 | |
7565bb98 | 250 | if (colors_enabled()) |
ac7a9674 LP |
251 | (void) loop_write(ttyfd, ANSI_HIGHLIGHT, STRLEN(ANSI_HIGHLIGHT), false); |
252 | ||
253 | (void) loop_write(ttyfd, message, strlen(message), false); | |
254 | (void) loop_write(ttyfd, " ", 1, false); | |
255 | ||
7565bb98 | 256 | if (colors_enabled()) |
ac7a9674 | 257 | (void) loop_write(ttyfd, ANSI_NORMAL, STRLEN(ANSI_NORMAL), false); |
7f4e0805 LP |
258 | |
259 | new_termios = old_termios; | |
260 | new_termios.c_lflag &= ~(ICANON|ECHO); | |
261 | new_termios.c_cc[VMIN] = 1; | |
262 | new_termios.c_cc[VTIME] = 0; | |
263 | ||
264 | if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) { | |
265 | r = -errno; | |
266 | goto finish; | |
267 | } | |
268 | ||
269 | reset_tty = true; | |
270 | } | |
271 | ||
70dee475 LP |
272 | pollfd[POLL_TTY] = (struct pollfd) { |
273 | .fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO, | |
274 | .events = POLLIN, | |
275 | }; | |
276 | pollfd[POLL_INOTIFY] = (struct pollfd) { | |
277 | .fd = notify, | |
278 | .events = POLLIN, | |
279 | }; | |
7f4e0805 LP |
280 | |
281 | for (;;) { | |
282 | char c; | |
283 | int sleep_for = -1, k; | |
284 | ssize_t n; | |
285 | ||
286 | if (until > 0) { | |
287 | usec_t y; | |
288 | ||
289 | y = now(CLOCK_MONOTONIC); | |
290 | ||
291 | if (y > until) { | |
7ded2e28 | 292 | r = -ETIME; |
7f4e0805 LP |
293 | goto finish; |
294 | } | |
295 | ||
c9eb4a00 | 296 | sleep_for = (int) DIV_ROUND_UP(until - y, USEC_PER_MSEC); |
7f4e0805 LP |
297 | } |
298 | ||
299 | if (flag_file) | |
300 | if (access(flag_file, F_OK) < 0) { | |
301 | r = -errno; | |
302 | goto finish; | |
303 | } | |
304 | ||
e287086b | 305 | k = poll(pollfd, notify >= 0 ? 2 : 1, sleep_for); |
981e4cd3 | 306 | if (k < 0) { |
7f4e0805 LP |
307 | if (errno == EINTR) |
308 | continue; | |
309 | ||
310 | r = -errno; | |
311 | goto finish; | |
312 | } else if (k == 0) { | |
ccc80078 | 313 | r = -ETIME; |
7f4e0805 LP |
314 | goto finish; |
315 | } | |
316 | ||
e287086b | 317 | if (notify >= 0 && pollfd[POLL_INOTIFY].revents != 0) |
665dfe93 | 318 | (void) flush_fd(notify); |
7f4e0805 LP |
319 | |
320 | if (pollfd[POLL_TTY].revents == 0) | |
321 | continue; | |
322 | ||
981e4cd3 LP |
323 | n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1); |
324 | if (n < 0) { | |
3742095b | 325 | if (IN_SET(errno, EINTR, EAGAIN)) |
7f4e0805 LP |
326 | continue; |
327 | ||
328 | r = -errno; | |
329 | goto finish; | |
330 | ||
331 | } else if (n == 0) | |
332 | break; | |
333 | ||
334 | if (c == '\n') | |
335 | break; | |
58fc840b | 336 | else if (c == 21) { /* C-u */ |
7f4e0805 | 337 | |
e287086b | 338 | if (!(flags & ASK_PASSWORD_SILENT)) |
58fc840b LP |
339 | backspace_chars(ttyfd, p); |
340 | p = 0; | |
7f4e0805 | 341 | |
4c701096 | 342 | } else if (IN_SET(c, '\b', 127)) { |
58fc840b LP |
343 | |
344 | if (p > 0) { | |
345 | ||
e287086b | 346 | if (!(flags & ASK_PASSWORD_SILENT)) |
58fc840b LP |
347 | backspace_chars(ttyfd, 1); |
348 | ||
7f4e0805 | 349 | p--; |
e287086b | 350 | } else if (!dirty && !(flags & ASK_PASSWORD_SILENT)) { |
441dfe09 | 351 | |
e287086b | 352 | flags |= ASK_PASSWORD_SILENT; |
441dfe09 LP |
353 | |
354 | /* There are two ways to enter silent | |
355 | * mode. Either by pressing backspace | |
e287086b LP |
356 | * as first key (and only as first |
357 | * key), or ... */ | |
441dfe09 | 358 | if (ttyfd >= 0) |
ac7a9674 | 359 | (void) loop_write(ttyfd, "(no echo) ", 10, false); |
441dfe09 | 360 | |
58fc840b | 361 | } else if (ttyfd >= 0) |
ac7a9674 | 362 | (void) loop_write(ttyfd, "\a", 1, false); |
7f4e0805 | 363 | |
e287086b | 364 | } else if (c == '\t' && !(flags & ASK_PASSWORD_SILENT)) { |
58fc840b LP |
365 | |
366 | backspace_chars(ttyfd, p); | |
e287086b | 367 | flags |= ASK_PASSWORD_SILENT; |
58fc840b | 368 | |
441dfe09 LP |
369 | /* ... or by pressing TAB at any time. */ |
370 | ||
58fc840b | 371 | if (ttyfd >= 0) |
ac7a9674 | 372 | (void) loop_write(ttyfd, "(no echo) ", 10, false); |
7f4e0805 | 373 | } else { |
036eeac5 | 374 | if (p >= sizeof(passphrase)-1) { |
0f133928 | 375 | if (ttyfd >= 0) |
ac7a9674 | 376 | (void) loop_write(ttyfd, "\a", 1, false); |
036eeac5 LP |
377 | continue; |
378 | } | |
379 | ||
7f4e0805 LP |
380 | passphrase[p++] = c; |
381 | ||
f3149d57 ZJS |
382 | if (!(flags & ASK_PASSWORD_SILENT) && ttyfd >= 0) { |
383 | n = utf8_encoded_valid_unichar(passphrase + codepoint); | |
384 | if (n >= 0) { | |
385 | codepoint = p; | |
ac7a9674 | 386 | (void) loop_write(ttyfd, (flags & ASK_PASSWORD_ECHO) ? &c : "*", 1, false); |
f3149d57 ZJS |
387 | } |
388 | } | |
441dfe09 LP |
389 | |
390 | dirty = true; | |
7f4e0805 | 391 | } |
1602b008 LP |
392 | |
393 | c = 'x'; | |
7f4e0805 LP |
394 | } |
395 | ||
981e4cd3 | 396 | x = strndup(passphrase, p); |
2d26d8e0 | 397 | explicit_bzero(passphrase, p); |
981e4cd3 | 398 | if (!x) { |
7f4e0805 LP |
399 | r = -ENOMEM; |
400 | goto finish; | |
401 | } | |
402 | ||
e287086b LP |
403 | if (keyname) |
404 | (void) add_to_keyring_and_log(keyname, flags, STRV_MAKE(x)); | |
405 | ||
406 | *ret = x; | |
7f4e0805 LP |
407 | r = 0; |
408 | ||
409 | finish: | |
981e4cd3 | 410 | if (ttyfd >= 0 && reset_tty) { |
ac7a9674 LP |
411 | (void) loop_write(ttyfd, "\n", 1, false); |
412 | (void) tcsetattr(ttyfd, TCSADRAIN, &old_termios); | |
7f4e0805 LP |
413 | } |
414 | ||
415 | return r; | |
416 | } | |
417 | ||
418 | static int create_socket(char **name) { | |
00843602 | 419 | union sockaddr_union sa = { |
b92bea5d ZJS |
420 | .un.sun_family = AF_UNIX, |
421 | }; | |
00843602 LP |
422 | _cleanup_close_ int fd = -1; |
423 | static const int one = 1; | |
7f4e0805 | 424 | char *c; |
00843602 | 425 | int r; |
7f4e0805 LP |
426 | |
427 | assert(name); | |
428 | ||
e62d8c39 | 429 | fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
4a62c710 | 430 | if (fd < 0) |
00843602 | 431 | return -errno; |
7f4e0805 | 432 | |
9bf3b535 | 433 | snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/run/systemd/ask-password/sck.%" PRIx64, random_u64()); |
7f4e0805 | 434 | |
5c0d398d | 435 | RUN_WITH_UMASK(0177) { |
fc2fffe7 | 436 | if (bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) |
00843602 | 437 | return -errno; |
5c0d398d | 438 | } |
1d6702e8 | 439 | |
00843602 LP |
440 | if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) |
441 | return -errno; | |
7f4e0805 | 442 | |
e62d8c39 | 443 | c = strdup(sa.un.sun_path); |
00843602 LP |
444 | if (!c) |
445 | return -ENOMEM; | |
7f4e0805 LP |
446 | |
447 | *name = c; | |
7f4e0805 | 448 | |
00843602 LP |
449 | r = fd; |
450 | fd = -1; | |
7f4e0805 LP |
451 | |
452 | return r; | |
453 | } | |
454 | ||
7f4e0805 LP |
455 | int ask_password_agent( |
456 | const char *message, | |
457 | const char *icon, | |
9fa1de96 | 458 | const char *id, |
e287086b | 459 | const char *keyname, |
7f4e0805 | 460 | usec_t until, |
e287086b LP |
461 | AskPasswordFlags flags, |
462 | char ***ret) { | |
7f4e0805 LP |
463 | |
464 | enum { | |
465 | FD_SOCKET, | |
466 | FD_SIGNAL, | |
467 | _FD_MAX | |
468 | }; | |
469 | ||
e287086b | 470 | _cleanup_close_ int socket_fd = -1, signal_fd = -1, fd = -1; |
2b583ce6 | 471 | char temp[] = "/run/systemd/ask-password/tmp.XXXXXX"; |
7f4e0805 | 472 | char final[sizeof(temp)] = ""; |
981e4cd3 | 473 | _cleanup_free_ char *socket_name = NULL; |
e287086b LP |
474 | _cleanup_strv_free_ char **l = NULL; |
475 | _cleanup_fclose_ FILE *f = NULL; | |
7f4e0805 | 476 | struct pollfd pollfd[_FD_MAX]; |
e287086b | 477 | sigset_t mask, oldmask; |
981e4cd3 | 478 | int r; |
7f4e0805 | 479 | |
e287086b | 480 | assert(ret); |
21bc923a | 481 | |
e287086b LP |
482 | if (flags & ASK_PASSWORD_NO_AGENT) |
483 | return -EUNATCH; | |
00843602 | 484 | |
72c0a2c2 LP |
485 | assert_se(sigemptyset(&mask) >= 0); |
486 | assert_se(sigset_add_many(&mask, SIGINT, SIGTERM, -1) >= 0); | |
487 | assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) >= 0); | |
f9b72cd8 | 488 | |
00843602 | 489 | (void) mkdir_p_label("/run/systemd/ask-password", 0755); |
7f4e0805 | 490 | |
646853bd | 491 | fd = mkostemp_safe(temp); |
1d6702e8 | 492 | if (fd < 0) { |
709f6e46 | 493 | r = fd; |
7f4e0805 LP |
494 | goto finish; |
495 | } | |
496 | ||
00843602 | 497 | (void) fchmod(fd, 0644); |
7f4e0805 | 498 | |
981e4cd3 LP |
499 | f = fdopen(fd, "w"); |
500 | if (!f) { | |
00843602 | 501 | r = -errno; |
7f4e0805 LP |
502 | goto finish; |
503 | } | |
504 | ||
505 | fd = -1; | |
506 | ||
981e4cd3 LP |
507 | signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); |
508 | if (signal_fd < 0) { | |
00843602 | 509 | r = -errno; |
7f4e0805 LP |
510 | goto finish; |
511 | } | |
512 | ||
981e4cd3 LP |
513 | socket_fd = create_socket(&socket_name); |
514 | if (socket_fd < 0) { | |
7f4e0805 LP |
515 | r = socket_fd; |
516 | goto finish; | |
517 | } | |
518 | ||
519 | fprintf(f, | |
520 | "[Ask]\n" | |
de0671ee | 521 | "PID="PID_FMT"\n" |
7f4e0805 | 522 | "Socket=%s\n" |
21bc923a | 523 | "AcceptCached=%i\n" |
64845bdc | 524 | "Echo=%i\n" |
de0671ee | 525 | "NotAfter="USEC_FMT"\n", |
df0ff127 | 526 | getpid_cached(), |
7f4e0805 | 527 | socket_name, |
e287086b LP |
528 | (flags & ASK_PASSWORD_ACCEPT_CACHED) ? 1 : 0, |
529 | (flags & ASK_PASSWORD_ECHO) ? 1 : 0, | |
de0671ee | 530 | until); |
7f4e0805 LP |
531 | |
532 | if (message) | |
533 | fprintf(f, "Message=%s\n", message); | |
534 | ||
535 | if (icon) | |
536 | fprintf(f, "Icon=%s\n", icon); | |
537 | ||
9fa1de96 DH |
538 | if (id) |
539 | fprintf(f, "Id=%s\n", id); | |
540 | ||
dacd6cee | 541 | r = fflush_and_check(f); |
00843602 | 542 | if (r < 0) |
7f4e0805 | 543 | goto finish; |
7f4e0805 LP |
544 | |
545 | memcpy(final, temp, sizeof(temp)); | |
546 | ||
547 | final[sizeof(final)-11] = 'a'; | |
548 | final[sizeof(final)-10] = 's'; | |
549 | final[sizeof(final)-9] = 'k'; | |
550 | ||
551 | if (rename(temp, final) < 0) { | |
00843602 | 552 | r = -errno; |
7f4e0805 LP |
553 | goto finish; |
554 | } | |
555 | ||
556 | zero(pollfd); | |
557 | pollfd[FD_SOCKET].fd = socket_fd; | |
558 | pollfd[FD_SOCKET].events = POLLIN; | |
559 | pollfd[FD_SIGNAL].fd = signal_fd; | |
560 | pollfd[FD_SIGNAL].events = POLLIN; | |
561 | ||
562 | for (;;) { | |
563 | char passphrase[LINE_MAX+1]; | |
564 | struct msghdr msghdr; | |
565 | struct iovec iovec; | |
566 | struct ucred *ucred; | |
567 | union { | |
568 | struct cmsghdr cmsghdr; | |
569 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
570 | } control; | |
571 | ssize_t n; | |
572 | int k; | |
573 | usec_t t; | |
574 | ||
575 | t = now(CLOCK_MONOTONIC); | |
576 | ||
7dcda352 | 577 | if (until > 0 && until <= t) { |
7f4e0805 LP |
578 | r = -ETIME; |
579 | goto finish; | |
580 | } | |
581 | ||
981e4cd3 LP |
582 | k = poll(pollfd, _FD_MAX, until > 0 ? (int) ((until-t)/USEC_PER_MSEC) : -1); |
583 | if (k < 0) { | |
7f4e0805 LP |
584 | if (errno == EINTR) |
585 | continue; | |
586 | ||
00843602 | 587 | r = -errno; |
7f4e0805 LP |
588 | goto finish; |
589 | } | |
590 | ||
591 | if (k <= 0) { | |
7f4e0805 LP |
592 | r = -ETIME; |
593 | goto finish; | |
594 | } | |
595 | ||
21bc923a LP |
596 | if (pollfd[FD_SIGNAL].revents & POLLIN) { |
597 | r = -EINTR; | |
598 | goto finish; | |
599 | } | |
7f4e0805 LP |
600 | |
601 | if (pollfd[FD_SOCKET].revents != POLLIN) { | |
7f4e0805 LP |
602 | r = -EIO; |
603 | goto finish; | |
604 | } | |
605 | ||
606 | zero(iovec); | |
607 | iovec.iov_base = passphrase; | |
21bc923a | 608 | iovec.iov_len = sizeof(passphrase); |
7f4e0805 LP |
609 | |
610 | zero(control); | |
611 | zero(msghdr); | |
612 | msghdr.msg_iov = &iovec; | |
613 | msghdr.msg_iovlen = 1; | |
614 | msghdr.msg_control = &control; | |
615 | msghdr.msg_controllen = sizeof(control); | |
616 | ||
981e4cd3 LP |
617 | n = recvmsg(socket_fd, &msghdr, 0); |
618 | if (n < 0) { | |
3742095b | 619 | if (IN_SET(errno, EAGAIN, EINTR)) |
7f4e0805 LP |
620 | continue; |
621 | ||
00843602 | 622 | r = -errno; |
7f4e0805 LP |
623 | goto finish; |
624 | } | |
625 | ||
1c8da044 LP |
626 | cmsg_close_all(&msghdr); |
627 | ||
7f4e0805 | 628 | if (n <= 0) { |
00843602 | 629 | log_debug("Message too short"); |
7f4e0805 LP |
630 | continue; |
631 | } | |
632 | ||
633 | if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) || | |
634 | control.cmsghdr.cmsg_level != SOL_SOCKET || | |
635 | control.cmsghdr.cmsg_type != SCM_CREDENTIALS || | |
636 | control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) { | |
00843602 | 637 | log_debug("Received message without credentials. Ignoring."); |
7f4e0805 LP |
638 | continue; |
639 | } | |
640 | ||
641 | ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr); | |
642 | if (ucred->uid != 0) { | |
00843602 | 643 | log_debug("Got request from unprivileged user. Ignoring."); |
7f4e0805 LP |
644 | continue; |
645 | } | |
646 | ||
647 | if (passphrase[0] == '+') { | |
e287086b | 648 | /* An empty message refers to the empty password */ |
8254a475 LP |
649 | if (n == 1) |
650 | l = strv_new("", NULL); | |
651 | else | |
652 | l = strv_parse_nulstr(passphrase+1, n-1); | |
2d26d8e0 | 653 | explicit_bzero(passphrase, n); |
8254a475 | 654 | if (!l) { |
7f4e0805 LP |
655 | r = -ENOMEM; |
656 | goto finish; | |
657 | } | |
658 | ||
58629001 | 659 | if (strv_isempty(l)) { |
e287086b | 660 | l = strv_free(l); |
00843602 | 661 | log_debug("Invalid packet"); |
21bc923a LP |
662 | continue; |
663 | } | |
664 | ||
e287086b LP |
665 | break; |
666 | } | |
21bc923a | 667 | |
e287086b | 668 | if (passphrase[0] == '-') { |
7f4e0805 LP |
669 | r = -ECANCELED; |
670 | goto finish; | |
7f4e0805 LP |
671 | } |
672 | ||
e287086b | 673 | log_debug("Invalid packet"); |
7f4e0805 LP |
674 | } |
675 | ||
e287086b LP |
676 | if (keyname) |
677 | (void) add_to_keyring_and_log(keyname, flags, l); | |
678 | ||
679 | *ret = l; | |
680 | l = NULL; | |
7f4e0805 LP |
681 | r = 0; |
682 | ||
683 | finish: | |
981e4cd3 | 684 | if (socket_name) |
00843602 | 685 | (void) unlink(socket_name); |
7f4e0805 | 686 | |
00843602 | 687 | (void) unlink(temp); |
7f4e0805 LP |
688 | |
689 | if (final[0]) | |
00843602 | 690 | (void) unlink(final); |
7f4e0805 | 691 | |
f9b72cd8 | 692 | assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0); |
7f4e0805 LP |
693 | return r; |
694 | } | |
260ab287 | 695 | |
00843602 LP |
696 | int ask_password_auto( |
697 | const char *message, | |
698 | const char *icon, | |
699 | const char *id, | |
e287086b | 700 | const char *keyname, |
00843602 | 701 | usec_t until, |
e287086b LP |
702 | AskPasswordFlags flags, |
703 | char ***ret) { | |
00843602 LP |
704 | |
705 | int r; | |
706 | ||
e287086b | 707 | assert(ret); |
21bc923a | 708 | |
e287086b LP |
709 | if ((flags & ASK_PASSWORD_ACCEPT_CACHED) && keyname) { |
710 | r = ask_password_keyring(keyname, flags, ret); | |
711 | if (r != -ENOKEY) | |
712 | return r; | |
713 | } | |
714 | ||
715 | if (!(flags & ASK_PASSWORD_NO_TTY) && isatty(STDIN_FILENO)) { | |
21bc923a LP |
716 | char *s = NULL, **l = NULL; |
717 | ||
e287086b | 718 | r = ask_password_tty(message, keyname, until, flags, NULL, &s); |
981e4cd3 | 719 | if (r < 0) |
21bc923a LP |
720 | return r; |
721 | ||
1602b008 LP |
722 | r = strv_push(&l, s); |
723 | if (r < 0) { | |
724 | string_erase(s); | |
725 | free(s); | |
00843602 | 726 | return -ENOMEM; |
1602b008 | 727 | } |
21bc923a | 728 | |
e287086b | 729 | *ret = l; |
00843602 LP |
730 | return 0; |
731 | } | |
732 | ||
e287086b LP |
733 | if (!(flags & ASK_PASSWORD_NO_AGENT)) |
734 | return ask_password_agent(message, icon, id, keyname, until, flags, ret); | |
735 | ||
736 | return -EUNATCH; | |
260ab287 | 737 | } |