Commit | Line | Data |
---|---|---|
069c185c | 1 | /* -*-c-*- |
2 | * | |
069c185c | 3 | * Passphrase pixie for Catacomb |
4 | * | |
5 | * (c) 1999 Straylight/Edgeware | |
6 | */ | |
7 | ||
45c0fd36 | 8 | /*----- Licensing notice --------------------------------------------------* |
069c185c | 9 | * |
10 | * This file is part of Catacomb. | |
11 | * | |
12 | * Catacomb is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU Library General Public License as | |
14 | * published by the Free Software Foundation; either version 2 of the | |
15 | * License, or (at your option) any later version. | |
45c0fd36 | 16 | * |
069c185c | 17 | * Catacomb is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU Library General Public License for more details. | |
45c0fd36 | 21 | * |
069c185c | 22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with Catacomb; if not, write to the Free | |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
25 | * MA 02111-1307, USA. | |
26 | */ | |
27 | ||
069c185c | 28 | /*----- Header files ------------------------------------------------------*/ |
29 | ||
30 | #include "config.h" | |
31 | ||
32 | #include <assert.h> | |
33 | #include <ctype.h> | |
34 | #include <errno.h> | |
35 | #include <signal.h> | |
36 | #include <stdarg.h> | |
37 | #include <stddef.h> | |
38 | #include <stdio.h> | |
39 | #include <stdlib.h> | |
40 | #include <string.h> | |
41 | #include <time.h> | |
42 | ||
43 | #include <sys/types.h> | |
44 | #include <sys/time.h> | |
45 | #include <unistd.h> | |
46 | #include <sys/stat.h> | |
47 | #include <sys/wait.h> | |
48 | #include <pwd.h> | |
49 | #include <fcntl.h> | |
50 | #include <sys/ioctl.h> | |
51 | #include <termios.h> | |
52 | #include <syslog.h> | |
53 | ||
54 | #include <sys/socket.h> | |
55 | #include <sys/un.h> | |
56 | ||
57 | #include <mLib/alloc.h> | |
58 | #include <mLib/dstr.h> | |
59 | #include <mLib/fdflags.h> | |
141c1284 | 60 | #include <mLib/macros.h> |
069c185c | 61 | #include <mLib/mdwopt.h> |
62 | #include <mLib/quis.h> | |
63 | #include <mLib/report.h> | |
64 | #include <mLib/sel.h> | |
65 | #include <mLib/selbuf.h> | |
66 | #include <mLib/sig.h> | |
67 | #include <mLib/str.h> | |
68 | #include <mLib/sub.h> | |
69 | #include <mLib/tv.h> | |
70 | ||
6a2d21e4 | 71 | #include "arena.h" |
069c185c | 72 | #include "lmem.h" |
73 | #include "passphrase.h" | |
74 | #include "pixie.h" | |
75 | ||
76 | /*----- Static variables --------------------------------------------------*/ | |
77 | ||
4cb04adb | 78 | static unsigned long timeout = 900; |
069c185c | 79 | static sel_state sel; |
80 | static unsigned verbose = 1; | |
81 | static const char *command = 0; | |
82 | static lmem lm; | |
83 | static unsigned flags = 0; | |
84 | ||
16efd15b | 85 | #define F_SYSLOG 1u |
86 | #define F_FETCH 2u | |
902cbb33 | 87 | #define F_REPLACE 4u |
069c185c | 88 | |
89 | /*----- Event logging -----------------------------------------------------*/ | |
90 | ||
c725c20d | 91 | /* --- @pxlog@ --- * |
069c185c | 92 | * |
93 | * Arguments: @const char *p@ = @printf@-style format string | |
94 | * @...@ = extra arguments to fill in | |
95 | * | |
96 | * Returns: --- | |
97 | * | |
98 | * Use: Writes out a timestamped log message. | |
99 | */ | |
100 | ||
23bbea75 | 101 | static void PRINTF_LIKE(1, 2) pxlog(const char *p, ...) |
069c185c | 102 | { |
103 | dstr d = DSTR_INIT; | |
104 | va_list ap; | |
105 | ||
106 | if (!(flags & F_SYSLOG)) { | |
107 | time_t t = time(0); | |
108 | struct tm *tm = localtime(&t); | |
109 | DENSURE(&d, 64); | |
110 | d.len += strftime(d.buf, d.sz, "%Y-%m-%d %H:%M:%S ", tm); | |
111 | } | |
112 | va_start(ap, p); | |
5cf2e636 | 113 | dstr_vputf(&d, p, &ap); |
069c185c | 114 | va_end(ap); |
115 | ||
116 | if (flags & F_SYSLOG) | |
117 | syslog(LOG_NOTICE, "%s", d.buf); | |
118 | else { | |
119 | DPUTC(&d, '\n'); | |
120 | dstr_write(&d, stderr); | |
121 | } | |
122 | DDESTROY(&d); | |
123 | } | |
124 | ||
125 | /*----- Passphrase management ---------------------------------------------*/ | |
126 | ||
127 | /* --- Data structures --- */ | |
128 | ||
129 | typedef struct phrase { | |
35c0995d | 130 | struct phrase *next, *prev; |
069c185c | 131 | char *tag; |
132 | char *p; | |
133 | unsigned long t; | |
134 | sel_timer timer; | |
135 | unsigned f; | |
136 | } phrase; | |
137 | ||
138 | /* --- Variables --- */ | |
139 | ||
35c0995d MW |
140 | static phrase *p_head = 0, *p_tail = 0; |
141 | ||
142 | /* --- Utility macros --- */ | |
143 | ||
144 | #define P_LINKTAIL(p) do { \ | |
145 | (p)->next = 0; \ | |
146 | (p)->prev = p_tail; \ | |
147 | *(p_tail ? &p_tail->next : &p_head) = (p); \ | |
148 | p_tail = (p); \ | |
149 | } while (0) | |
150 | ||
151 | #define P_UNLINK(p) do { \ | |
152 | *((p)->next ? &(p)->next->prev : &p_tail) = (p)->prev; \ | |
153 | *((p)->prev ? &(p)->prev->next : &p_head) = (p)->next; \ | |
154 | } while (0) | |
069c185c | 155 | |
156 | /* --- @p_free@ --- * | |
157 | * | |
158 | * Arguments: @phrase *p@ = pointer to phrase block | |
159 | * | |
160 | * Returns: --- | |
161 | * | |
162 | * Use: Frees a phrase block. | |
163 | */ | |
164 | ||
165 | static void p_free(phrase *p) | |
166 | { | |
167 | if (p->t) | |
168 | sel_rmtimer(&p->timer); | |
12ed8a1f | 169 | xfree(p->tag); |
069c185c | 170 | l_free(&lm, p->p); |
35c0995d | 171 | P_UNLINK(p); |
069c185c | 172 | DESTROY(p); |
173 | } | |
174 | ||
175 | /* --- @p_timer@ --- * | |
176 | * | |
177 | * Arguments: @struct timeval *tv@ = current time | |
178 | * @void *p@ = pointer to phrase | |
179 | * | |
180 | * Returns: --- | |
181 | * | |
182 | * Use: Expires a passphrase. | |
183 | */ | |
184 | ||
185 | static void p_timer(struct timeval *tv, void *p) | |
186 | { | |
187 | phrase *pp = p; | |
188 | if (verbose) | |
c725c20d | 189 | pxlog("expiring passphrase `%s'", pp->tag); |
069c185c | 190 | p_free(pp); |
191 | } | |
192 | ||
193 | /* --- @p_alloc@ --- * | |
194 | * | |
195 | * Arguments: @size_t sz@ = amount of memory required | |
196 | * | |
197 | * Returns: Pointer to allocated memory, or null. | |
198 | * | |
199 | * Use: Allocates some locked memory, flushing old passphrases if | |
200 | * there's not enough space. | |
201 | */ | |
202 | ||
203 | static void *p_alloc(size_t sz) | |
204 | { | |
205 | for (;;) { | |
206 | char *p; | |
207 | if ((p = l_alloc(&lm, sz)) != 0) | |
208 | return (p); | |
35c0995d | 209 | if (!p_head) |
069c185c | 210 | return (0); |
45c0fd36 | 211 | if (verbose) { |
c725c20d MW |
212 | pxlog("flushing passphrase `%s' to free up needed space", |
213 | p_head->tag); | |
069c185c | 214 | } |
35c0995d | 215 | p_free(p_head); |
069c185c | 216 | } |
217 | } | |
218 | ||
219 | /* --- @p_find@ --- * | |
220 | * | |
221 | * Arguments: @const char *tag@ = pointer to tag to find | |
222 | * | |
223 | * Returns: Pointer to passphrase block, or null. | |
224 | * | |
225 | * Use: Finds a passphrase with a given tag. | |
226 | */ | |
227 | ||
228 | static phrase *p_find(const char *tag) | |
229 | { | |
230 | phrase *p; | |
231 | ||
35c0995d | 232 | for (p = p_head; p; p = p->next) { |
141c1284 | 233 | if (STRCMP(p->tag, ==, tag)) { |
069c185c | 234 | if (p->t) { |
235 | struct timeval tv; | |
236 | sel_rmtimer(&p->timer); | |
237 | gettimeofday(&tv, 0); | |
238 | tv.tv_sec += p->t; | |
239 | sel_addtimer(&sel, &p->timer, &tv, p_timer, p); | |
240 | } | |
35c0995d MW |
241 | P_UNLINK(p); |
242 | P_LINKTAIL(p); | |
069c185c | 243 | return (p); |
244 | } | |
245 | } | |
246 | return (0); | |
247 | } | |
248 | ||
249 | /* --- @p_add@ --- * | |
250 | * | |
251 | * Arguments: @const char *tag@ = pointer to tag string | |
252 | * @const char *p@ = pointer to passphrase | |
253 | * @unsigned long t@ = expiry timeout | |
254 | * | |
255 | * Returns: Pointer to newly-added passphrase. | |
256 | * | |
257 | * Use: Adds a new passphrase. The tag must not already exist. | |
258 | */ | |
259 | ||
260 | static phrase *p_add(const char *tag, const char *p, unsigned long t) | |
261 | { | |
262 | size_t sz = strlen(p) + 1; | |
263 | char *l = p_alloc(sz); | |
264 | phrase *pp; | |
265 | ||
266 | /* --- Make sure the locked memory was allocated --- */ | |
267 | ||
268 | if (!l) | |
269 | return (0); | |
270 | ||
271 | /* --- Fill in some other bits of the block --- */ | |
272 | ||
273 | pp = CREATE(phrase); | |
274 | memcpy(l, p, sz); | |
275 | pp->p = l; | |
276 | pp->tag = xstrdup(tag); | |
277 | pp->f = 0; | |
278 | ||
279 | /* --- Set the timer --- */ | |
280 | ||
281 | pp->t = t; | |
282 | if (t) { | |
283 | struct timeval tv; | |
284 | gettimeofday(&tv, 0); | |
285 | tv.tv_sec += t; | |
286 | sel_addtimer(&sel, &pp->timer, &tv, p_timer, pp); | |
287 | } | |
288 | ||
289 | /* --- Link the block into the chain --- */ | |
290 | ||
35c0995d | 291 | P_LINKTAIL(pp); |
069c185c | 292 | return (pp); |
293 | } | |
294 | ||
295 | /* --- @p_flush@ --- * | |
296 | * | |
297 | * Arguments: @const char *tag@ = pointer to tag string, or zero for all | |
298 | * | |
299 | * Returns: --- | |
300 | * | |
301 | * Use: Immediately flushes either a single phrase or all of them. | |
302 | */ | |
303 | ||
304 | static void p_flush(const char *tag) | |
305 | { | |
306 | phrase *p; | |
307 | ||
308 | if (!tag && verbose > 1) | |
c725c20d | 309 | pxlog("flushing all passphrases"); |
35c0995d MW |
310 | p = p_head; |
311 | while (p) { | |
52b8f75d | 312 | phrase *pp = p->next; |
069c185c | 313 | if (!tag) |
314 | p_free(p); | |
141c1284 | 315 | else if (STRCMP(p->tag, ==, tag)) { |
069c185c | 316 | if (verbose > 1) |
c725c20d | 317 | pxlog("flushing passphrase `%s'", tag); |
069c185c | 318 | p_free(p); |
319 | break; | |
320 | } | |
52b8f75d | 321 | p = pp; |
069c185c | 322 | } |
323 | } | |
324 | ||
325 | /*----- Reading passphrases -----------------------------------------------*/ | |
326 | ||
327 | /* --- @p_request@ --- * | |
328 | * | |
329 | * Arguments: @const char *msg@ = message string | |
330 | * @const char *tag@ = pointer to tag string | |
331 | * @char *buf@ = pointer to (locked) buffer | |
332 | * @size_t sz@ = size of buffer | |
333 | * | |
334 | * Returns: Zero if all went well, nonzero otherwise. | |
335 | * | |
336 | * Use: Requests a passphrase from the user. | |
337 | */ | |
338 | ||
339 | static int p_request(const char *msg, const char *tag, char *buf, size_t sz) | |
340 | { | |
341 | /* --- If there's a passphrase-fetching command, run it --- */ | |
342 | ||
343 | if (command) { | |
344 | dstr d = DSTR_INIT; | |
345 | const char *p; | |
346 | int fd[2]; | |
347 | pid_t kid; | |
348 | int r; | |
4cb04adb | 349 | int rc; |
069c185c | 350 | |
351 | /* --- Substitute the prompt string into the command --- */ | |
352 | ||
353 | p = command; | |
354 | for (;;) { | |
355 | const char *q = strchr(p, '%'); | |
356 | if (!q || !q[1]) { | |
357 | DPUTS(&d, p); | |
358 | break; | |
359 | } | |
360 | DPUTM(&d, p, q - p); | |
361 | p = q + 1; | |
362 | switch (*p) { | |
363 | case 'm': | |
364 | DPUTS(&d, msg); | |
365 | break; | |
366 | case 't': | |
367 | DPUTS(&d, tag); | |
368 | break; | |
369 | default: | |
370 | DPUTC(&d, '%'); | |
371 | DPUTC(&d, *p); | |
372 | break; | |
373 | } | |
374 | p++; | |
375 | } | |
376 | DPUTZ(&d); | |
377 | ||
378 | /* --- Create a pipe and start a child process --- */ | |
379 | ||
380 | if (pipe(fd)) | |
381 | goto fail_1; | |
382 | if ((kid = fork()) < 0) | |
383 | goto fail_2; | |
384 | ||
385 | /* --- Child process --- */ | |
386 | ||
387 | fflush(0); | |
388 | if (kid == 0) { | |
389 | if (dup2(fd[1], STDOUT_FILENO) < 0) | |
390 | _exit(127); | |
391 | close(fd[0]); | |
113e872f | 392 | execl("/bin/sh", "sh", "-c", d.buf, (char *)0); |
069c185c | 393 | _exit(127); |
394 | } | |
395 | ||
396 | /* --- Read the data back into my buffer --- */ | |
397 | ||
398 | close(fd[1]); | |
399 | if ((r = read(fd[0], buf, sz - 1)) >= 0) { | |
400 | char *q = memchr(buf, '\n', r); | |
401 | if (!q) | |
402 | q = buf + r; | |
403 | *q = 0; | |
404 | } | |
405 | close(fd[0]); | |
4cb04adb | 406 | waitpid(kid, &rc, 0); |
069c185c | 407 | dstr_destroy(&d); |
4cb04adb | 408 | if (r < 0 || rc != 0) |
069c185c | 409 | goto fail_0; |
6a2d21e4 | 410 | goto ok; |
069c185c | 411 | |
412 | /* --- Tidy up when things go wrong --- */ | |
413 | ||
414 | fail_2: | |
415 | close(fd[0]); | |
416 | close(fd[1]); | |
417 | fail_1: | |
418 | dstr_destroy(&d); | |
419 | fail_0: | |
420 | return (-1); | |
421 | } | |
422 | ||
423 | /* --- Read a passphrase from the terminal --- * | |
424 | * | |
425 | * Use the standard Catacomb passphrase-reading function, so it'll read the | |
426 | * passphrase from a file descriptor or something if the appropriate | |
427 | * environment variable is set. | |
428 | */ | |
429 | ||
430 | { | |
431 | dstr d = DSTR_INIT; | |
432 | int rc; | |
433 | dstr_putf(&d, "%s %s: ", msg, tag); | |
434 | rc = pixie_getpass(d.buf, buf, sz); | |
435 | dstr_destroy(&d); | |
6a2d21e4 | 436 | if (rc) |
437 | return (rc); | |
438 | goto ok; | |
069c185c | 439 | } |
6a2d21e4 | 440 | |
441 | /* --- Sort out the buffer --- * | |
442 | * | |
443 | * Strip leading spaces. | |
444 | */ | |
445 | ||
446 | ok: { | |
447 | char *p = buf; | |
448 | size_t len; | |
141c1284 | 449 | while (ISSPACE(*p)) |
6a2d21e4 | 450 | p++; |
451 | len = strlen(p); | |
452 | memmove(buf, p, len); | |
453 | p[len] = 0; | |
454 | } | |
455 | ||
456 | /* --- Done --- */ | |
457 | ||
458 | return (0); | |
069c185c | 459 | } |
460 | ||
461 | /* --- @p_get@ --- * | |
462 | * | |
6a2d21e4 | 463 | * Arguments: @const char **q@ = where to store the result |
464 | * @const char *tag@ = pointer to tag string | |
069c185c | 465 | * @unsigned mode@ = reading mode (verify?) |
466 | * @time_t exp@ = expiry time suggestion | |
467 | * | |
6a2d21e4 | 468 | * Returns: Zero if successful, @-1@ on a read failure, or @+1@ if the |
469 | * passphrase is missing and there is no fetcher. (This will | |
470 | * always happen if there is no fetcher and @mode@ is | |
471 | * @PMODE_VERIFY@. | |
069c185c | 472 | * |
473 | * Use: Reads a passphrase from somewhere. | |
474 | */ | |
475 | ||
6a2d21e4 | 476 | static int p_get(const char **q, const char *tag, unsigned mode, time_t exp) |
069c185c | 477 | { |
478 | #define LBUFSZ 1024 | |
479 | ||
480 | phrase *p; | |
481 | char *pp = 0; | |
482 | ||
483 | /* --- Write a log message --- */ | |
484 | ||
485 | if (verbose > 1) | |
c725c20d | 486 | pxlog("passphrase `%s' requested", tag); |
069c185c | 487 | |
6a2d21e4 | 488 | /* --- If there is no fetcher, life is simpler --- */ |
489 | ||
490 | if (!(flags & F_FETCH)) { | |
491 | if (mode == PMODE_VERIFY) | |
492 | return (+1); | |
493 | if ((p = p_find(tag)) == 0) | |
494 | return (+1); | |
495 | *q = p->p; | |
496 | return (0); | |
497 | } | |
498 | ||
069c185c | 499 | /* --- Try to find the phrase --- */ |
500 | ||
6a2d21e4 | 501 | if (mode == PMODE_VERIFY) |
502 | p_flush(tag); | |
503 | if (mode == PMODE_VERIFY || (p = p_find(tag)) == 0) { | |
069c185c | 504 | if ((pp = p_alloc(LBUFSZ)) == 0) |
505 | goto fail; | |
6a2d21e4 | 506 | if (p_request(mode == PMODE_READ ? "Passphrase" : "New passphrase", |
507 | tag, pp, LBUFSZ) < 0) | |
069c185c | 508 | goto fail; |
509 | p = p_add(tag, pp, exp); | |
510 | if (!p) | |
511 | goto fail; | |
512 | } | |
513 | ||
514 | /* --- If verification is requested, verify the passphrase --- */ | |
515 | ||
516 | if (mode == PMODE_VERIFY) { | |
517 | if (!pp && (pp = p_alloc(LBUFSZ)) == 0) | |
518 | goto fail; | |
519 | if (p_request("Verify passphrase", tag, pp, LBUFSZ) < 0) | |
520 | goto fail; | |
141c1284 | 521 | if (STRCMP(pp, !=, p->p)) { |
069c185c | 522 | if (verbose) |
c725c20d | 523 | pxlog("passphrases for `%s' don't match", tag); |
069c185c | 524 | p_free(p); |
525 | goto fail; | |
526 | } | |
527 | } | |
528 | ||
529 | /* --- Tidy up and return the passphrase --- */ | |
530 | ||
531 | if (pp) { | |
532 | memset(pp, 0, LBUFSZ); | |
533 | l_free(&lm, pp); | |
534 | } | |
6a2d21e4 | 535 | *q = p->p; |
536 | return (0); | |
069c185c | 537 | |
538 | /* --- Tidy up if things went wrong --- */ | |
539 | ||
540 | fail: | |
541 | if (pp) { | |
542 | memset(pp, 0, LBUFSZ); | |
543 | l_free(&lm, pp); | |
544 | } | |
4cb04adb | 545 | return (-1); |
069c185c | 546 | |
547 | #undef LBUFSZ | |
548 | } | |
549 | ||
550 | /*----- Server command parsing --------------------------------------------*/ | |
551 | ||
552 | /* --- Data structures --- */ | |
553 | ||
554 | typedef struct pixserv { | |
555 | selbuf b; | |
556 | int fd; | |
557 | sel_timer timer; | |
6a2d21e4 | 558 | unsigned f; |
069c185c | 559 | } pixserv; |
560 | ||
9d23d982 | 561 | #define px_stdin 1u |
6a2d21e4 | 562 | |
563 | #define PIXSERV_TIMEOUT 30 | |
069c185c | 564 | |
565 | /* --- @pixserv_expire@ --- * | |
566 | * | |
567 | * Arguments: @struct timeval *tv@ = pointer to current time | |
568 | * @void *p@ = pointer to server block | |
569 | * | |
570 | * Returns: --- | |
571 | * | |
572 | * Use: Expires a pixie connection if the remote end decides he's not | |
573 | * interested any more. | |
574 | */ | |
575 | ||
576 | static void pixserv_expire(struct timeval *tv, void *p) | |
577 | { | |
578 | pixserv *px = p; | |
579 | if (px->fd != px->b.reader.fd) | |
580 | close(px->fd); | |
6a2d21e4 | 581 | selbuf_destroy(&px->b); |
069c185c | 582 | close(px->b.reader.fd); |
583 | DESTROY(px); | |
584 | } | |
585 | ||
586 | /* --- @pixserv_write@ --- * | |
587 | * | |
588 | * Arguments: @pixserv *px@ = pointer to server block | |
589 | * @const char *p@ = pointer to skeleton string | |
590 | * @...@ = other arguments to fill in | |
591 | * | |
70a5dedf | 592 | * Returns: Zero on success, @-1@ on error. |
069c185c | 593 | * |
594 | * Use: Formats a string and emits it to the output file. | |
595 | */ | |
596 | ||
70a5dedf | 597 | static int PRINTF_LIKE(2, 3) pixserv_write(pixserv *px, const char *p, ...) |
069c185c | 598 | { |
599 | dstr d = DSTR_INIT; | |
600 | va_list ap; | |
70a5dedf | 601 | int rc; |
069c185c | 602 | |
603 | va_start(ap, p); | |
5cf2e636 | 604 | dstr_vputf(&d, p, &ap); |
70a5dedf | 605 | rc = write(px->fd, d.buf, d.len); |
069c185c | 606 | va_end(ap); |
607 | dstr_destroy(&d); | |
70a5dedf MW |
608 | if (rc < 0) { |
609 | pxlog("failed to write to client: %s (closing)", strerror(errno)); | |
610 | return (-1); | |
611 | } | |
612 | return (0); | |
069c185c | 613 | } |
614 | ||
615 | /* --- @pixserv_timeout@ --- * | |
616 | * | |
617 | * Arguments: @const char *p@ = pointer to timeout string | |
618 | * | |
619 | * Returns: Timeout in seconds. | |
620 | * | |
621 | * Use: Translates a string to a timeout value in seconds. | |
622 | */ | |
623 | ||
624 | static unsigned long pixserv_timeout(const char *p) | |
625 | { | |
626 | unsigned long t; | |
627 | char *q; | |
628 | ||
629 | if (!p) | |
630 | return (timeout); | |
631 | ||
632 | t = strtoul(p, &q, 0); | |
633 | switch (*q) { | |
634 | case 'd': t *= 24; | |
635 | case 'h': t *= 60; | |
636 | case 'm': t *= 60; | |
637 | case 's': if (q[1] != 0) | |
45c0fd36 | 638 | default: t = 0; |
069c185c | 639 | case 0: break; |
640 | } | |
641 | return (t); | |
642 | } | |
643 | ||
644 | /* --- @pixserv_line@ --- * | |
645 | * | |
646 | * Arguments: @char *s@ = pointer to the line read | |
5cf2e636 | 647 | * @size_t len@ = length of the line |
069c185c | 648 | * @void *p@ = pointer to server block |
649 | * | |
650 | * Returns: --- | |
651 | * | |
652 | * Use: Handles a line read from the client. | |
653 | */ | |
654 | ||
5cf2e636 | 655 | static void pixserv_line(char *s, size_t len, void *p) |
069c185c | 656 | { |
657 | pixserv *px = p; | |
658 | char *q, *qq; | |
659 | unsigned mode; | |
660 | ||
661 | /* --- Handle an end-of-file --- */ | |
662 | ||
6a2d21e4 | 663 | if (!(px->f & px_stdin)) |
664 | sel_rmtimer(&px->timer); | |
70a5dedf | 665 | if (!s) goto close; |
069c185c | 666 | |
667 | /* --- Fiddle the timeout --- */ | |
668 | ||
6a2d21e4 | 669 | if (!(px->f & px_stdin)) { |
069c185c | 670 | struct timeval tv; |
671 | gettimeofday(&tv, 0); | |
672 | tv.tv_sec += PIXSERV_TIMEOUT; | |
673 | sel_addtimer(&sel, &px->timer, &tv, pixserv_expire, px); | |
674 | } | |
675 | ||
676 | /* --- Scan out the first word --- */ | |
677 | ||
678 | if ((q = str_getword(&s)) == 0) | |
679 | return; | |
680 | for (qq = q; *qq; qq++) | |
141c1284 | 681 | *qq = TOLOWER(*qq); |
069c185c | 682 | |
683 | /* --- Handle a help request --- */ | |
684 | ||
141c1284 | 685 | if (STRCMP(q, ==, "help")) { |
70a5dedf | 686 | if (pixserv_write(px, "\ |
069c185c | 687 | INFO Commands supported:\n\ |
1a530ec2 MW |
688 | INFO flush [TAG]\n\ |
689 | INFO help\n\ | |
690 | INFO list\n\ | |
691 | INFO pass TAG [EXPIRE]\n\ | |
692 | INFO quit\n\ | |
693 | INFO set TAG [EXPIRE] -- PHRASE\n\ | |
694 | INFO verify TAG [EXPIRE]\n\ | |
069c185c | 695 | OK\n\ |
70a5dedf MW |
696 | ")) |
697 | goto close; | |
069c185c | 698 | } |
699 | ||
700 | /* --- List the passphrases --- */ | |
701 | ||
141c1284 | 702 | else if (STRCMP(q, ==, "list")) { |
069c185c | 703 | phrase *p; |
704 | ||
35c0995d | 705 | for (p = p_head; p; p = p->next) { |
70a5dedf MW |
706 | if (!p->t) { |
707 | if (pixserv_write(px, "ITEM %s no-expire\n", p->tag)) goto close; | |
708 | } else { | |
069c185c | 709 | struct timeval tv; |
710 | gettimeofday(&tv, 0); | |
711 | TV_SUB(&tv, &p->timer.tv, &tv); | |
70a5dedf MW |
712 | if (pixserv_write(px, "ITEM %s %lu\n", |
713 | p->tag, (unsigned long)tv.tv_sec)) | |
714 | goto close; | |
069c185c | 715 | } |
716 | } | |
70a5dedf | 717 | if (pixserv_write(px, "OK\n")) goto close; |
069c185c | 718 | } |
719 | ||
720 | /* --- Request a passphrase --- */ | |
721 | ||
141c1284 MW |
722 | else if ((mode = PMODE_READ, STRCMP(q, ==, "pass")) || |
723 | (mode = PMODE_VERIFY, STRCMP(q, ==, "verify"))) { | |
069c185c | 724 | unsigned long t; |
725 | const char *p; | |
6a2d21e4 | 726 | int rc; |
069c185c | 727 | |
728 | if ((q = str_getword(&s)) == 0) | |
729 | pixserv_write(px, "FAIL missing tag\n"); | |
730 | else if ((t = pixserv_timeout(s)) == 0) | |
731 | pixserv_write(px, "FAIL bad timeout\n"); | |
6a2d21e4 | 732 | else { |
733 | rc = p_get(&p, q, mode, t > timeout ? timeout : t); | |
734 | switch (rc) { | |
735 | case 0: | |
70a5dedf | 736 | if (pixserv_write(px, "OK %s\n", p)) goto close; |
6a2d21e4 | 737 | break; |
738 | case -1: | |
70a5dedf MW |
739 | if (pixserv_write(px, "FAIL error reading passphrase\n")) |
740 | goto close; | |
6a2d21e4 | 741 | break; |
742 | case +1: | |
70a5dedf | 743 | if (pixserv_write(px, "MISSING\n")) goto close; |
6a2d21e4 | 744 | break; |
745 | } | |
746 | } | |
069c185c | 747 | } |
748 | ||
749 | /* --- Flush existing passphrases --- */ | |
750 | ||
141c1284 | 751 | else if (STRCMP(q, ==, "flush")) { |
069c185c | 752 | q = str_getword(&s); |
753 | p_flush(q); | |
70a5dedf | 754 | if (pixserv_write(px, "OK\n")) goto close; |
069c185c | 755 | } |
756 | ||
6a2d21e4 | 757 | /* --- Set a passphrase --- */ |
758 | ||
141c1284 | 759 | else if (STRCMP(q, ==, "set")) { |
6a2d21e4 | 760 | char *tag; |
761 | unsigned long t; | |
70a5dedf MW |
762 | if ((tag = str_getword(&s)) == 0) { |
763 | if (pixserv_write(px, "FAIL missing tag\n")) goto close; | |
764 | } else if ((q = str_getword(&s)) == 0) { | |
765 | if (pixserv_write(px, "FAIL no passphrase\n")) goto close; | |
766 | } else { | |
141c1284 | 767 | if (STRCMP(q, !=, "--")) { |
6a2d21e4 | 768 | t = pixserv_timeout(q); |
769 | q = str_getword(&s); | |
770 | } else | |
771 | t = pixserv_timeout(0); | |
70a5dedf MW |
772 | if (!q) { |
773 | if (pixserv_write(px, "FAIL no passphrase\n")) goto close; | |
141c1284 | 774 | } else if (STRCMP(q, !=, "--")) { |
70a5dedf MW |
775 | if (pixserv_write(px, "FAIL rubbish found before passphrase\n")) |
776 | goto close; | |
777 | } else { | |
6a2d21e4 | 778 | p_flush(tag); |
912ebbc5 | 779 | p_add(tag, s ? s : "", t); |
70a5dedf | 780 | if (pixserv_write(px, "OK\n")) goto close; |
6a2d21e4 | 781 | } |
782 | } | |
783 | } | |
784 | ||
069c185c | 785 | /* --- Shut the server down --- */ |
786 | ||
141c1284 | 787 | else if (STRCMP(q, ==, "quit")) { |
70a5dedf | 788 | if (verbose) { |
c725c20d MW |
789 | pxlog("%s client requested shutdown", |
790 | px->f & px_stdin ? "local" : "remote"); | |
70a5dedf MW |
791 | } |
792 | if (pixserv_write(px, "OK\n")) goto close; | |
069c185c | 793 | exit(0); |
794 | } | |
795 | ||
796 | /* --- Report an error for other commands --- */ | |
797 | ||
70a5dedf MW |
798 | else { |
799 | if (pixserv_write(px, "FAIL unknown command `%s'\n", q)) goto close; | |
800 | } | |
801 | return; | |
802 | ||
803 | close: | |
804 | if (px->fd != px->b.reader.fd) | |
805 | close(px->fd); | |
806 | selbuf_destroy(&px->b); | |
807 | close(px->b.reader.fd); | |
069c185c | 808 | } |
809 | ||
810 | /* --- @pixserv_create@ --- * | |
811 | * | |
812 | * Arguments: @int fd@ = file descriptor to read from | |
813 | * @int ofd@ = file descriptor to write to | |
814 | * | |
6a2d21e4 | 815 | * Returns: Pointer to the new connection. |
069c185c | 816 | * |
817 | * Use: Creates a new Pixie server instance for a new connection. | |
818 | */ | |
819 | ||
6a2d21e4 | 820 | static pixserv *pixserv_create(int fd, int ofd) |
069c185c | 821 | { |
822 | pixserv *px = CREATE(pixserv); | |
823 | struct timeval tv; | |
824 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); | |
825 | if (ofd != fd) | |
826 | fdflags(ofd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); | |
827 | px->fd = ofd; | |
828 | selbuf_init(&px->b, &sel, fd, pixserv_line, px); | |
6a2d21e4 | 829 | px->b.b.a = arena_secure; |
830 | selbuf_setsize(&px->b, 1024); | |
069c185c | 831 | gettimeofday(&tv, 0); |
832 | tv.tv_sec += PIXSERV_TIMEOUT; | |
833 | sel_addtimer(&sel, &px->timer, &tv, pixserv_expire, px); | |
6a2d21e4 | 834 | px->f = 0; |
835 | return (px); | |
069c185c | 836 | } |
837 | ||
838 | /* --- @pixserv_accept@ --- * | |
839 | * | |
840 | * Arguments: @int fd@ = file descriptor | |
841 | * @unsigned mode@ = what's happened | |
842 | * @void *p@ = an uninteresting argument | |
843 | * | |
844 | * Returns: --- | |
845 | * | |
846 | * Use: Accepts a new connection. | |
847 | */ | |
848 | ||
849 | static void pixserv_accept(int fd, unsigned mode, void *p) | |
850 | { | |
851 | int nfd; | |
852 | struct sockaddr_un sun; | |
67ea7285 | 853 | socklen_t sunsz = sizeof(sun); |
069c185c | 854 | |
855 | if (mode != SEL_READ) | |
856 | return; | |
857 | if ((nfd = accept(fd, (struct sockaddr *)&sun, &sunsz)) < 0) { | |
962dd332 | 858 | if (verbose && errno != EAGAIN && errno != EWOULDBLOCK && |
859 | errno != ECONNABORTED && errno != EPROTO && errno != EINTR) | |
c725c20d | 860 | pxlog("new connection failed: %s", strerror(errno)); |
069c185c | 861 | return; |
862 | } | |
863 | pixserv_create(nfd, nfd); | |
864 | } | |
865 | ||
866 | /*----- Setting up the server ---------------------------------------------*/ | |
867 | ||
868 | /* --- @unlinksocket@ --- * | |
869 | * | |
870 | * Arguments: --- | |
871 | * | |
872 | * Returns: --- | |
873 | * | |
874 | * Use: Tidies up the socket when it's finished with. | |
875 | */ | |
876 | ||
877 | static char *sockpath; | |
878 | ||
879 | static void unlinksocket(void) | |
880 | { | |
881 | unlink(sockpath); | |
882 | l_purge(&lm); | |
883 | } | |
884 | ||
885 | /* --- @pix_sigdie@ --- * | |
886 | * | |
887 | * Arguments: @int sig@ = signal number | |
888 | * @void *p@ = uninteresting argument | |
889 | * | |
890 | * Returns: --- | |
891 | * | |
892 | * Use: Shuts down the program after a fatal signal. | |
893 | */ | |
894 | ||
895 | static void pix_sigdie(int sig, void *p) | |
896 | { | |
897 | if (verbose) { | |
898 | char *p; | |
899 | char buf[20]; | |
900 | ||
901 | switch (sig) { | |
902 | case SIGTERM: p = "SIGTERM"; break; | |
903 | case SIGINT: p = "SIGINT"; break; | |
904 | default: | |
905 | sprintf(buf, "signal %i", sig); | |
906 | p = buf; | |
907 | break; | |
908 | } | |
c725c20d | 909 | pxlog("shutting down on %s", p); |
069c185c | 910 | } |
911 | exit(0); | |
912 | } | |
913 | ||
914 | /* --- @pix_sigflush@ --- * | |
915 | * | |
916 | * Arguments: @int sig@ = signal number | |
917 | * @void *p@ = uninteresting argument | |
918 | * | |
919 | * Returns: --- | |
920 | * | |
921 | * Use: Flushes the passphrase cache on receipt of a signal. | |
922 | */ | |
923 | ||
924 | static void pix_sigflush(int sig, void *p) | |
925 | { | |
926 | if (verbose) { | |
927 | char *p; | |
928 | char buf[20]; | |
929 | ||
930 | switch (sig) { | |
931 | case SIGHUP: p = "SIGHUP"; break; | |
932 | case SIGQUIT: p = "SIGQUIT"; break; | |
933 | default: | |
934 | sprintf(buf, "signal %i", sig); | |
935 | p = buf; | |
936 | break; | |
937 | } | |
c725c20d | 938 | pxlog("received %s; flushing passphrases", p); |
069c185c | 939 | } |
940 | p_flush(0); | |
941 | } | |
942 | ||
943 | /* --- @pix_setup@ --- * | |
944 | * | |
945 | * Arguments: @struct sockaddr_un *sun@ = pointer to address to use | |
946 | * @size_t sz@ = size of socket address | |
947 | * | |
948 | * Returns: --- | |
949 | * | |
950 | * Use: Sets up the pixie's Unix-domain socket. | |
951 | */ | |
952 | ||
953 | static void pix_setup(struct sockaddr_un *sun, size_t sz) | |
954 | { | |
955 | int fd; | |
956 | ||
957 | /* --- Set up the parent directory --- */ | |
958 | ||
959 | { | |
069c185c | 960 | char *p = sun->sun_path; |
961 | char *q = strrchr(p, '/'); | |
962 | ||
963 | if (q) { | |
4cb04adb | 964 | dstr d = DSTR_INIT; |
069c185c | 965 | struct stat st; |
966 | ||
967 | DPUTM(&d, p, q - p); | |
968 | DPUTZ(&d); | |
969 | ||
970 | mkdir(d.buf, 0700); | |
971 | if (stat(d.buf, &st)) | |
972 | die(1, "couldn't stat `%s': %s", d.buf, strerror(errno)); | |
4cb04adb | 973 | if (!S_ISDIR(st.st_mode)) |
974 | die(1, "object `%s' isn't a directory", d.buf); | |
069c185c | 975 | if (st.st_mode & 0077) |
976 | die(1, "parent directory `%s' has group or world access", d.buf); | |
4cb04adb | 977 | dstr_destroy(&d); |
069c185c | 978 | } |
979 | } | |
980 | ||
981 | /* --- Initialize the socket --- */ | |
982 | ||
983 | { | |
984 | int n = 5; | |
985 | int e; | |
986 | ||
987 | umask(0077); | |
988 | again: | |
989 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
990 | die(1, "couldn't create socket: %s", strerror(errno)); | |
991 | if (bind(fd, (struct sockaddr *)sun, sz) < 0) { | |
992 | e = errno; | |
993 | if (errno != EADDRINUSE) | |
994 | die(1, "couldn't bind to address: %s", strerror(e)); | |
995 | if (!n) | |
996 | die(1, "too many retries; giving up"); | |
997 | n--; | |
998 | if (connect(fd, (struct sockaddr *)sun, sz)) { | |
4cb04adb | 999 | struct stat st; |
069c185c | 1000 | if (errno != ECONNREFUSED) |
1001 | die(1, "couldn't bind to address: %s", strerror(e)); | |
4cb04adb | 1002 | if (stat(sun->sun_path, &st)) |
1003 | die(1, "couldn't stat `%s': %s", sun->sun_path, strerror(errno)); | |
1004 | if (!S_ISSOCK(st.st_mode)) | |
1005 | die(1, "object `%s' isn't a socket", sun->sun_path); | |
069c185c | 1006 | if (verbose) |
c725c20d | 1007 | pxlog("stale socket found; removing it"); |
069c185c | 1008 | unlink(sun->sun_path); |
1009 | close(fd); | |
902cbb33 | 1010 | } else if (flags & F_REPLACE) { |
069c185c | 1011 | if (verbose) |
c725c20d | 1012 | pxlog("server already running; shutting it down"); |
70a5dedf MW |
1013 | if (write(fd, "QUIT\n", 5) < 0) { |
1014 | die(EXIT_FAILURE, "failed to shut down old server: %s", | |
1015 | strerror(errno)); | |
1016 | } | |
069c185c | 1017 | sleep(1); |
1018 | close(fd); | |
902cbb33 MW |
1019 | } else |
1020 | die(EXIT_FAILURE, "pixie already running; not starting"); | |
069c185c | 1021 | goto again; |
1022 | } | |
1023 | chmod(sun->sun_path, 0600); | |
1024 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); | |
1025 | if (listen(fd, 5)) | |
1026 | die(1, "couldn't listen on socket: %s", strerror(errno)); | |
1027 | } | |
1028 | ||
1029 | /* --- Set up the rest of the server --- */ | |
1030 | ||
1031 | { | |
1032 | static sel_file serv; | |
1033 | sockpath = sun->sun_path; | |
1034 | atexit(unlinksocket); | |
1035 | sel_initfile(&sel, &serv, fd, SEL_READ, pixserv_accept, 0); | |
1036 | sel_addfile(&serv); | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | /*----- Client support code -----------------------------------------------*/ | |
1041 | ||
1042 | /* --- Variables --- */ | |
1043 | ||
6a2d21e4 | 1044 | static selbuf c_server, c_client; |
4933a180 | 1045 | static unsigned c_flags = 0; |
9d23d982 | 1046 | |
1047 | #define cf_uclose 1u | |
1048 | #define cf_sclose 2u | |
025c5f4a | 1049 | #define cf_cooked 4u |
069c185c | 1050 | |
1051 | /* --- Line handler functions --- */ | |
1052 | ||
5cf2e636 | 1053 | static void c_uline(char *s, size_t len, void *p) |
069c185c | 1054 | { |
6a2d21e4 | 1055 | if (!s) { |
1056 | selbuf_destroy(&c_client); | |
1057 | shutdown(c_server.reader.fd, 1); | |
1058 | c_flags |= cf_uclose; | |
1059 | } else { | |
5cf2e636 | 1060 | s[len++] = '\n'; |
70a5dedf MW |
1061 | if (write(c_server.reader.fd, s, len) < 0) |
1062 | die(EXIT_FAILURE, "failed to read from stdin: %s", strerror(errno)); | |
6a2d21e4 | 1063 | } |
069c185c | 1064 | } |
1065 | ||
5cf2e636 | 1066 | static void c_sline(char *s, size_t len, void *p) |
069c185c | 1067 | { |
1068 | if (!s) { | |
6a2d21e4 | 1069 | selbuf_destroy(&c_server); |
1070 | if (!(c_flags & cf_uclose)) { | |
069c185c | 1071 | moan("server closed the connection"); |
6a2d21e4 | 1072 | selbuf_destroy(&c_client); |
1073 | } | |
069c185c | 1074 | exit(0); |
81b5dd60 | 1075 | } |
025c5f4a | 1076 | if (!(c_flags & cf_cooked)) |
1077 | puts(s); | |
1078 | else { | |
1079 | char *q = str_getword(&s); | |
141c1284 | 1080 | if (STRCMP(q, ==, "FAIL")) |
599e2cbf | 1081 | die(1, "%s", s); |
141c1284 MW |
1082 | else if (STRCMP(q, ==, "INFO") || |
1083 | STRCMP(q, ==, "ITEM")) | |
025c5f4a | 1084 | puts(s); |
141c1284 | 1085 | else if (STRCMP(q, ==, "OK")) { |
025c5f4a | 1086 | if (s && *s) puts(s); |
141c1284 | 1087 | } else if (STRCMP(q, ==, "MISSING")) |
025c5f4a | 1088 | ; |
1089 | else | |
1090 | moan("unexpected output: %s %s", q, s); | |
1091 | } | |
069c185c | 1092 | } |
1093 | ||
1094 | /* --- @pix_client@ --- * | |
1095 | * | |
1096 | * Arguments: @struct sockaddr_un *sun@ = pointer to socket address | |
1097 | * @size_t sz@ = size of socket address | |
1098 | * @char *argv[]@ = pointer to arguments to send | |
1099 | * | |
1100 | * Returns: --- | |
1101 | * | |
1102 | * Use: Performs client-side actions for the passphrase pixie. | |
1103 | */ | |
1104 | ||
1105 | static void pix_client(struct sockaddr_un *sun, size_t sz, char *argv[]) | |
1106 | { | |
1107 | int fd; | |
1108 | ||
4cb04adb | 1109 | /* --- Dispose of locked memory --- */ |
1110 | ||
1111 | l_destroy(&lm); | |
1112 | ||
069c185c | 1113 | /* --- Open the socket --- */ |
1114 | ||
1115 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) | |
1116 | die(1, "couldn't create socket: %s", strerror(errno)); | |
1117 | if (connect(fd, (struct sockaddr *)sun, sz)) | |
1118 | die(1, "couldn't connect to server: %s", strerror(errno)); | |
1119 | selbuf_init(&c_server, &sel, fd, c_sline, 0); | |
1120 | ||
1121 | /* --- If there are any arguments, turn them into a string --- */ | |
1122 | ||
1123 | if (!*argv) | |
1124 | selbuf_init(&c_client, &sel, STDIN_FILENO, c_uline, 0); | |
1125 | else { | |
1126 | dstr d = DSTR_INIT; | |
1127 | DPUTS(&d, *argv++); | |
1128 | while (*argv) { | |
1129 | DPUTC(&d, ' '); | |
1130 | DPUTS(&d, *argv++); | |
1131 | } | |
1132 | DPUTC(&d, '\n'); | |
70a5dedf MW |
1133 | if (write(fd, d.buf, d.len) < 0 || shutdown(fd, 1)) |
1134 | die(EXIT_FAILURE, "failed to write command: %s", strerror(errno)); | |
025c5f4a | 1135 | c_flags |= cf_uclose | cf_cooked; |
069c185c | 1136 | dstr_destroy(&d); |
45c0fd36 | 1137 | } |
069c185c | 1138 | |
1139 | /* --- And repeat --- */ | |
1140 | ||
81b5dd60 | 1141 | for (;;) { |
1142 | if (sel_select(&sel)) | |
1143 | die(EXIT_FAILURE, "select error: %s", strerror(errno)); | |
1144 | } | |
069c185c | 1145 | } |
1146 | ||
1147 | /*----- Main code ---------------------------------------------------------*/ | |
1148 | ||
1149 | /* --- @help@, @version@, @usage@ --- * | |
1150 | * | |
1151 | * Arguments: @FILE *fp@ = stream to write on | |
1152 | * | |
1153 | * Returns: --- | |
1154 | * | |
1155 | * Use: Emit helpful messages. | |
1156 | */ | |
1157 | ||
1158 | static void usage(FILE *fp) | |
1159 | { | |
1160 | pquis(fp, "\ | |
1161 | Usage:\n\ | |
a88abbcd | 1162 | $ [-qvfidl] [-c COMMAND] [-t TIMEOUT] [-s SOCKET]\n\ |
1163 | $ [-s SOCKET] -C [COMMAND ARGS...]\n\ | |
025c5f4a | 1164 | $ [-s SOCKET] -P[P] TAG\n\ |
069c185c | 1165 | "); |
1166 | } | |
1167 | ||
1168 | static void version(FILE *fp) | |
1169 | { | |
1170 | pquis(fp, "$, Catacomb version " VERSION "\n"); | |
1171 | } | |
1172 | ||
1173 | static void help(FILE *fp) | |
1174 | { | |
1175 | version(fp); | |
1176 | fputc('\n', fp); | |
1177 | usage(fp); | |
1178 | pquis(fp, "\n\ | |
1179 | The Catacomb passphrase pixie collects and caches passphrases used to\n\ | |
1180 | protect important keys. Options provided:\n\ | |
1181 | \n\ | |
1182 | -h, --help Show this help text.\n\ | |
1183 | -V, --version Show the program's version number.\n\ | |
1184 | -u, --usage Show a (very) terse usage summary.\n\ | |
1185 | \n\ | |
1186 | -C, --client Connect to a running pixie as a client.\n\ | |
025c5f4a | 1187 | -P, --passphrase Request passphrase TAG and print to stdout.\n\ |
1188 | -PP, --verify-passphrase\n\ | |
1189 | Verify passphrase TAG and print to stdout.\n\ | |
069c185c | 1190 | \n\ |
1191 | -q, --quiet Emit fewer log messages.\n\ | |
1192 | -v, --version Emit more log messages.\n\ | |
1193 | -s, --socket=FILE Name the pixie's socket.\n\ | |
902cbb33 | 1194 | -r, --replace Replace existing pixie, if one is running.\n\ |
069c185c | 1195 | -c, --command=COMMAND Shell command to read a passphrase.\n\ |
6a2d21e4 | 1196 | -f, --fetch Fetch passphrases from the terminal.\n\ |
069c185c | 1197 | -t, --timeout=TIMEOUT Length of time to retain a passphrase in memory.\n\ |
1198 | -i, --interactive Allow commands to be typed interactively.\n\ | |
6a2d21e4 | 1199 | -d, --daemon Fork into the background after initialization.\n\ |
069c185c | 1200 | -l, --syslog Emit log messages to the system log.\n\ |
1201 | \n\ | |
1202 | The COMMAND may contain `%m' and `%t' markers which are replaced by a\n\ | |
1203 | prompt message and the passphrase tag respectively. The TIMEOUT is an\n\ | |
1204 | integer, optionally followed by `d', `h', `m' or `s' to specify units of\n\ | |
1205 | days, hours, minutes or seconds respectively.\n\ | |
1206 | \n\ | |
1207 | In client mode, if a command is specified on the command line, it is sent\n\ | |
1208 | to the running server; otherwise the program reads requests from stdin.\n\ | |
1209 | Responses from the pixie are written to stdout. Send a HELP request for\n\ | |
1210 | a quick summary of the pixie communication protocol.\n\ | |
1211 | "); | |
1212 | } | |
1213 | ||
1214 | /* --- @main@ --- * | |
1215 | * | |
1216 | * Arguments: @int argc@ = number of arguments | |
1217 | * @char *argv[]@ = vector of argument values | |
1218 | * | |
1219 | * Returns: Zero if OK. | |
1220 | * | |
1221 | * Use: Main program. Listens on a socket and responds with a PGP | |
1222 | * passphrase when asked. | |
1223 | */ | |
1224 | ||
1225 | int main(int argc, char *argv[]) | |
1226 | { | |
1227 | char *path = 0; | |
1228 | struct sockaddr_un *sun; | |
1229 | size_t sz; | |
1230 | unsigned f = 0; | |
1231 | ||
16efd15b | 1232 | #define f_bogus 1u |
1233 | #define f_client 2u | |
1234 | #define f_stdin 4u | |
1235 | #define f_daemon 8u | |
1236 | #define f_syslog 16u | |
025c5f4a | 1237 | #define f_fetch 32u |
1238 | #define f_verify 64u | |
069c185c | 1239 | |
1240 | /* --- Initialize libraries --- */ | |
1241 | ||
1242 | ego(argv[0]); | |
1243 | sub_init(); | |
1244 | ||
1245 | /* --- Set up the locked memory area --- */ | |
1246 | ||
6a2d21e4 | 1247 | l_init(&lm, 16384); |
ffb29736 | 1248 | if (setuid(getuid())) _exit(125); |
069c185c | 1249 | |
1250 | /* --- Parse command line arguments --- */ | |
1251 | ||
1252 | for (;;) { | |
1253 | static struct option opts[] = { | |
1254 | ||
1255 | /* --- Standard GNUy help options --- */ | |
1256 | ||
1257 | { "help", 0, 0, 'h' }, | |
1258 | { "version", 0, 0, 'V' }, | |
1259 | { "usage", 0, 0, 'u' }, | |
1260 | ||
1261 | /* --- Other options --- */ | |
1262 | ||
1263 | { "quiet", 0, 0, 'q' }, | |
1264 | { "verbose", 0, 0, 'v' }, | |
1265 | { "client", 0, 0, 'C' }, | |
025c5f4a | 1266 | { "passphrase", 0, 0, 'P' }, |
1267 | { "verify-passphrase", 0, 0, '+' }, | |
069c185c | 1268 | { "socket", OPTF_ARGREQ, 0, 's' }, |
902cbb33 | 1269 | { "replace", 0, 0, 'r' }, |
069c185c | 1270 | { "command", OPTF_ARGREQ, 0, 'c' }, |
6a2d21e4 | 1271 | { "fetch", 0, 0, 'f' }, |
069c185c | 1272 | { "timeout", OPTF_ARGREQ, 0, 't' }, |
1273 | { "interactive", 0, 0, 'i' }, | |
1274 | { "stdin", 0, 0, 'i' }, | |
1275 | { "daemon", 0, 0, 'd' }, | |
1276 | { "log", 0, 0, 'l' }, | |
1277 | { "syslog", 0, 0, 'l' }, | |
1278 | ||
1279 | /* --- Magic terminator --- */ | |
1280 | ||
45c0fd36 | 1281 | { 0, 0, 0, 0 } |
069c185c | 1282 | }; |
1283 | ||
902cbb33 | 1284 | int i = mdwopt(argc, argv, "hVuqvCPs:rc:ft:idl", opts, 0, 0, 0); |
069c185c | 1285 | if (i < 0) |
1286 | break; | |
1287 | ||
1288 | switch (i) { | |
1289 | ||
1290 | /* --- GNUy help options --- */ | |
1291 | ||
1292 | case 'h': | |
1293 | help(stdout); | |
1294 | exit(0); | |
1295 | case 'V': | |
1296 | version(stdout); | |
1297 | exit(0); | |
1298 | case 'u': | |
1299 | usage(stdout); | |
1300 | exit(0); | |
1301 | ||
1302 | /* --- Other interesting things --- */ | |
1303 | ||
1304 | case 'q': | |
1305 | if (verbose) | |
1306 | verbose--; | |
1307 | break; | |
1308 | case 'v': | |
1309 | verbose++; | |
1310 | break; | |
1311 | case 'C': | |
1312 | f |= f_client; | |
025c5f4a | 1313 | f &= ~f_fetch; |
1314 | break; | |
1315 | case 'P': | |
1316 | if (!(f & f_fetch)) | |
1317 | f |= f_fetch; | |
1318 | else | |
1319 | f |= f_verify; | |
1320 | break; | |
1321 | case '+': | |
1322 | f |= f_fetch | f_verify; | |
1323 | f &= ~f_client; | |
069c185c | 1324 | break; |
1325 | case 's': | |
1326 | path = optarg; | |
1327 | break; | |
902cbb33 MW |
1328 | case 'r': |
1329 | flags |= F_REPLACE; | |
1330 | break; | |
069c185c | 1331 | case 't': |
1332 | if ((timeout = pixserv_timeout(optarg)) == 0) | |
1333 | die(1, "bad timeout `%s'", optarg); | |
1334 | break; | |
1335 | case 'c': | |
1336 | command = optarg; | |
6a2d21e4 | 1337 | flags |= F_FETCH; |
1338 | break; | |
1339 | case 'f': | |
1340 | flags |= F_FETCH; | |
069c185c | 1341 | break; |
1342 | case 'i': | |
1343 | f |= f_stdin; | |
1344 | break; | |
1345 | case 'd': | |
1346 | f |= f_daemon; | |
1347 | break; | |
1348 | case 'l': | |
1349 | f |= f_syslog; | |
1350 | break; | |
1351 | ||
1352 | /* --- Something else --- */ | |
1353 | ||
1354 | default: | |
1355 | f |= f_bogus; | |
1356 | break; | |
1357 | } | |
1358 | } | |
1359 | ||
025c5f4a | 1360 | if (f & f_bogus || |
1361 | (optind < argc && !(f & (f_client|f_fetch))) || | |
1362 | ((f & f_fetch) && optind != argc - 1)) { | |
069c185c | 1363 | usage(stderr); |
1364 | exit(1); | |
1365 | } | |
1366 | ||
025c5f4a | 1367 | /* --- Handle request for a passphrase --- */ |
1368 | ||
1369 | if (f & f_fetch) { | |
1370 | char *buf = l_alloc(&lm, 1024); | |
1371 | passphrase_connect(path); | |
1372 | if (passphrase_read(argv[optind], | |
1373 | (f & f_verify) ? PMODE_VERIFY : PMODE_READ, | |
1374 | buf, 1024)) | |
1375 | die(1, "failed to read passphrase: %s", strerror(errno)); | |
1376 | puts(buf); | |
1377 | return (0); | |
1378 | } | |
1379 | ||
069c185c | 1380 | /* --- Set up the socket address --- */ |
1381 | ||
1382 | sun = pixie_address(path, &sz); | |
1383 | ||
1384 | /* --- Initialize selectory --- */ | |
1385 | ||
1386 | sel_init(&sel); | |
1387 | signal(SIGPIPE, SIG_IGN); | |
1388 | ||
1389 | /* --- Be a client if a client's wanted --- */ | |
1390 | ||
1391 | if (f & f_client) | |
1392 | pix_client(sun, sz, argv + optind); | |
1393 | ||
1394 | /* --- Open the syslog if requested --- */ | |
1395 | ||
1396 | if (f & f_syslog) { | |
1397 | flags |= F_SYSLOG; | |
1398 | openlog(QUIS, 0, LOG_DAEMON); | |
1399 | } | |
1400 | ||
1401 | /* --- Check on the locked memory area --- */ | |
1402 | ||
1403 | { | |
1404 | dstr d = DSTR_INIT; | |
1405 | int rc = l_report(&lm, &d); | |
1406 | if (rc < 0) | |
2da1e58e | 1407 | die(EXIT_FAILURE, "%s", d.buf); |
069c185c | 1408 | else if (rc && verbose) { |
2da1e58e | 1409 | pxlog("%s", d.buf); |
c725c20d | 1410 | pxlog("couldn't lock passphrase buffer"); |
069c185c | 1411 | } |
1412 | dstr_destroy(&d); | |
6a2d21e4 | 1413 | arena_setsecure(&lm.a); |
069c185c | 1414 | } |
1415 | ||
1416 | /* --- Set signal behaviours --- */ | |
1417 | ||
1418 | { | |
1419 | static sig sigint, sigterm, sigquit, sighup; | |
2c41d513 | 1420 | struct sigaction sa; |
069c185c | 1421 | sig_init(&sel); |
2c41d513 | 1422 | sigaction(SIGINT, 0, &sa); |
1423 | if (sa.sa_handler != SIG_IGN) | |
1424 | sig_add(&sigint, SIGINT, pix_sigdie, 0); | |
069c185c | 1425 | sig_add(&sigterm, SIGTERM, pix_sigdie, 0); |
1426 | sig_add(&sigquit, SIGQUIT, pix_sigflush, 0); | |
1427 | sig_add(&sighup, SIGHUP, pix_sigflush, 0); | |
1428 | } | |
1429 | ||
1430 | /* --- Set up the server --- */ | |
1431 | ||
1432 | pix_setup(sun, sz); | |
6a2d21e4 | 1433 | if (f & f_stdin) { |
1434 | pixserv *px = pixserv_create(STDIN_FILENO, STDOUT_FILENO); | |
1435 | sel_rmtimer(&px->timer); | |
1436 | px->f |= px_stdin; | |
1437 | } | |
069c185c | 1438 | |
1439 | /* --- Fork into the background if requested --- */ | |
1440 | ||
45c0fd36 | 1441 | if (f & f_daemon) { |
069c185c | 1442 | pid_t kid; |
1443 | ||
1444 | if (((f & f_stdin) && | |
1445 | (isatty(STDIN_FILENO) || isatty(STDOUT_FILENO))) || | |
6a2d21e4 | 1446 | (!command && (flags & F_FETCH))) |
069c185c | 1447 | die(1, "can't become a daemon if terminal required"); |
1448 | ||
1449 | if ((kid = fork()) < 0) | |
1450 | die(1, "fork failed: %s", strerror(errno)); | |
1451 | if (kid) | |
1452 | _exit(0); | |
1453 | #ifdef TIOCNOTTY | |
1454 | { | |
1455 | int fd; | |
1456 | if ((fd = open("/dev/tty", O_RDONLY)) >= 0) { | |
1457 | ioctl(fd, TIOCNOTTY); | |
1458 | close(fd); | |
1459 | } | |
1460 | } | |
1461 | #endif | |
70a5dedf | 1462 | DISCARD(chdir("/")); |
069c185c | 1463 | setsid(); |
1464 | ||
3884054b | 1465 | if (fork() != 0) |
069c185c | 1466 | _exit(0); |
1467 | } | |
1468 | ||
2b2d07ca | 1469 | if (verbose) |
c725c20d | 1470 | pxlog("initialized ok"); |
2c41d513 | 1471 | |
1472 | { | |
1473 | int selerr = 0; | |
1474 | for (;;) { | |
1475 | if (!sel_select(&sel)) | |
1476 | selerr = 0; | |
1477 | else if (errno != EINTR && errno != EAGAIN) { | |
c725c20d | 1478 | pxlog("error from select: %s", strerror(errno)); |
2c41d513 | 1479 | selerr++; |
1480 | if (selerr > 8) { | |
c725c20d | 1481 | pxlog("too many consecutive select errors: bailing out"); |
2c41d513 | 1482 | exit(EXIT_FAILURE); |
1483 | } | |
1484 | } | |
1485 | } | |
1486 | } | |
069c185c | 1487 | return (0); |
1488 | } | |
1489 | ||
1490 | /*----- That's all, folks -------------------------------------------------*/ |