/[imapfilter]/imapfilter/file.c
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Contents of /imapfilter/file.c

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Revision 1.51 - (show annotations)
Sat Mar 22 15:26:53 2003 UTC (21 years ago) by lefcha
Branch: MAIN
Changes since 1.50: +4 -2 lines
File MIME type: text/plain
Check if in daemon mode when checking the SSL/TLS certificate.

1 #include <stdio.h>
2 #include <unistd.h>
3 #include <errno.h>
4 #include <sys/types.h>
5 #include <regex.h>
6 #include <string.h>
7 #include <stdlib.h>
8 #include <ctype.h>
9 #include <limits.h>
10 #include <sys/stat.h>
11 #include <fcntl.h>
12 #include <time.h>
13
14 #include "config.h"
15 #include "imapfilter.h"
16 #include "data.h"
17
18 #ifdef SSL_TLS
19 #include <openssl/ssl.h>
20 #include <openssl/x509.h>
21 #include <openssl/pem.h>
22 #endif
23
24
25 extern char logfile[PATH_MAX];
26 extern unsigned int options;
27 extern char charset[CHARSET_LEN];
28 extern unsigned int flags;
29 extern unsigned int interval;
30 extern long timeout;
31 extern char *home;
32
33 #ifdef ENCRYPTED_PASSWORDS
34 char *passphr; /* Master password to access the passwords
35 * file. */
36
37 #endif
38
39
40 /*
41 * Find the path to configuration file, open it and call parse_config().
42 */
43 int
44 read_config(char *cfg)
45 {
46 int r;
47 FILE *fd;
48 char *c;
49
50 c = NULL;
51
52 if (cfg == NULL) {
53 cfg = c = (char *)xmalloc(PATH_MAX * sizeof(char));
54 snprintf(cfg, PATH_MAX, "%s/%s", home, ".imapfilterrc");
55 }
56 #ifdef DEBUG
57 fprintf(stderr, "debug: configuration file: '%s'\n", cfg);
58 #endif
59 #ifdef CHECK_PERMISSIONS
60 check_file_perms(cfg, S_IRUSR | S_IWUSR);
61 #endif
62 fd = fopen(cfg, "r");
63 if (fd == NULL)
64 fatal(ERROR_FILE_OPEN, "opening config file %s; %s\n", cfg,
65 strerror(errno));
66
67 if (c != NULL)
68 xfree(c);
69
70 if ((r = parse_config(fd)))
71 fatal(ERROR_CONFIG_PARSE,
72 "parse error in config file at row %d\n", r);
73
74 fclose(fd);
75
76 #ifdef DEBUG
77 fprintf(stderr, "debug: options: %0#10x '%s'\n", options, charset);
78 #endif
79
80 return 0;
81 }
82
83
84 /*
85 * Parse configuration file.
86 */
87 int
88 parse_config(FILE * fd)
89 {
90 int i, r;
91 unsigned int row;
92 char line[LINE_MAX];
93 regex_t creg[13];
94 regmatch_t match[11];
95 const char *reg[13] = {
96 "^([[:blank:]]*\n|#.*\n)$",
97
98 "^[[:blank:]]*ACCOUNT[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]+"
99 "(([[:graph:]]+):([[:graph:]]*)|([[:graph:]]+))@"
100 "([[:alnum:].-]+)(:[[:digit:]]+)?[[:blank:]]*"
101 "([[:blank:]]SSL|[[:blank:]]SSL2|[[:blank:]]SSL3|"
102 "[[:blank:]]TLS1)?[[:blank:]]*\n$",
103
104 "^[[:blank:]]*FOLDER[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]+"
105 "([[:print:]]+)[[:blank:]]*\n$",
106
107 "^[[:blank:]]*FILTER[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]*"
108 "([[:blank:]]OR|[[:blank:]]AND)?[[:blank:]]*\n$",
109
110 "^[[:blank:]]*ACTION[[:blank:]]+(DELETE|"
111 "COPY[[:blank:]]+(\"[[:print:]]*\"|[[:graph:]]+)|"
112 "MOVE[[:blank:]]+(\"[[:print:]]*\"|[[:graph:]]+)|"
113 "RCOPY[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]+"
114 "(\"[[:print:]]*\"|[[:graph:]]+)|"
115 "RMOVE[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]+"
116 "(\"[[:print:]]*\"|[[:graph:]]+)|"
117 "FLAG[[:blank:]]+(REPLACE|ADD|REMOVE)[[:blank:]]+"
118 "([[:alpha:],]+)|"
119 "LIST)[[:blank:]]*([[:graph:]]*)[[:blank:]]*\n$",
120
121 "^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|"
122 "AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*"
123 "(ANSWERED|DELETED|DRAFT|FLAGGED|NEW|OLD|RECENT|SEEN|"
124 "UNANSWERED|UNDELETED|UNDRAFT|UNFLAGGED|UNSEEN)[[:blank:]]*\n$",
125
126 "^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|"
127 "AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*"
128 "(BCC|BODY|CC|FROM|SUBJECT|TEXT|TO)[[:blank:]]+"
129 "(\"[[:print:]]*\"|[[:graph:]]+)[[:blank:]]*\n$",
130
131 "^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|"
132 "AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*"
133 "(HEADER)[[:blank:]]+(\"[[:print:]]*\"|[[:graph:]]+)"
134 "[[:blank:]]+(\"[[:print:]]*\"|[[:graph:]]+)[[:blank:]]*\n$",
135
136 "^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|"
137 "AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*"
138 "(LARGER|SMALLER|OLDER|NEWER)[[:blank:]]+([[:digit:]]+)"
139 "[[:blank:]]*\n$",
140
141 "^[[:blank:]]*JOB[[:blank:]]+([[:alnum:],_-]+)[[:blank:]]+"
142 "([[:alnum:],_-]+)[[:blank:]]*\n$",
143
144 "^[[:blank:]]*(SET[[:blank:]])?[[:blank:]]*(LOGFILE|CHARSET)"
145 "[[:blank:]]*=[[:blank:]]*(\"[[:print:]]*\"|[[:graph:]]+)"
146 "[[:blank:]]*\n$",
147
148 "^[[:blank:]]*(SET[[:blank:]])?[[:blank:]]*(ERRORS|EXPUNGE|"
149 "HEADERS|NAMESPACE|SUBSCRIBE|WARNING)[[:blank:]]*=[[:blank:]]*"
150 "(YES|NO)[[:blank:]]*\n$",
151
152 "^[[:blank:]]*(SET[[:blank:]])?[[:blank:]]*(DAEMON|TIMEOUT)"
153 "[[:blank:]]*=[[:blank:]]*([[:digit:]]+)\n$"
154 };
155
156 r = row = 0;
157
158 for (i = 0; i < 13; i++)
159 regcomp(&creg[i], reg[i], REG_EXTENDED | REG_ICASE);
160
161 /* First process all the variables. This is done because some
162 * variables' arguments are used before the other commands are
163 * processed. */
164 while (fgets(line, LINE_MAX - 1, fd))
165 if (!regexec(&creg[10], line, 4, match, 0) ||
166 !regexec(&creg[11], line, 4, match, 0) ||
167 !regexec(&creg[12], line, 4, match, 0))
168 set_options(line, match);
169
170 /* Then rewind and process everything else. */
171 fseek(fd, 0L, SEEK_SET);
172 while (fgets(line, LINE_MAX - 1, fd)) {
173 row++;
174 if (!regexec(&creg[0], line, 0, match, 0))
175 continue;
176 else if (!regexec(&creg[1], line, 9, match, 0))
177 set_account(line, match);
178 else if (!regexec(&creg[2], line, 3, match, 0))
179 r = set_mboxgrp(line, match);
180 else if (!regexec(&creg[3], line, 3, match, 0))
181 r = set_filter(line, match);
182 else if (!regexec(&creg[4], line, 11, match, 0))
183 r = set_action(line, match);
184 else if (!regexec(&creg[5], line, 5, match, 0))
185 r = set_mask(line, match, MASK_MATCH_1);
186 else if (!regexec(&creg[6], line, 6, match, 0))
187 r = set_mask(line, match, MASK_MATCH_2);
188 else if (!regexec(&creg[7], line, 7, match, 0))
189 r = set_mask(line, match, MASK_MATCH_3);
190 else if (!regexec(&creg[8], line, 6, match, 0))
191 r = set_mask(line, match, MASK_MATCH_4);
192 else if (!regexec(&creg[9], line, 3, match, 0))
193 r = set_job(line, match);
194 /* Skip variable processing. */
195 else if (!regexec(&creg[10], line, 4, match, 0) ||
196 !regexec(&creg[11], line, 4, match, 0) ||
197 !regexec(&creg[12], line, 4, match, 0));
198 else
199 return row;
200
201 if (r == ERROR_CONFIG_PARSE)
202 return row;
203 }
204
205 for (i = 0; i < 13; i++)
206 regfree(&creg[i]);
207
208 destroy_data();
209
210 return 0;
211 }
212
213
214 /*
215 * Set other options found in config file.
216 */
217 void
218 set_options(char *line, regmatch_t * m)
219 {
220 if (!strncasecmp(line + m[2].rm_so, "logfile", 7)) {
221 if (*logfile == '\0') {
222 if (*(line + m[3].rm_so) == '"' &&
223 *(line + m[3].rm_eo - 1) == '"')
224 strncat(logfile, line + m[3].rm_so + 1,
225 min((m[3].rm_eo - m[3].rm_so - 2),
226 PATH_MAX - 1));
227 else
228 strncat(logfile, line + m[3].rm_so,
229 min((m[3].rm_eo - m[3].rm_so),
230 PATH_MAX - 1));
231 }
232 } else if (!strncasecmp(line + m[2].rm_so, "charset", 7)) {
233 if (*(line + m[3].rm_so) == '"' &&
234 *(line + m[3].rm_eo - 1) == '"')
235 strncat(charset, line + m[3].rm_so + 1,
236 min((m[3].rm_eo - m[3].rm_so - 2),
237 CHARSET_LEN - 1));
238 else
239 strncat(charset, line + m[3].rm_so,
240 min((m[3].rm_eo - m[3].rm_so), CHARSET_LEN - 1));
241 } else if (!strncasecmp(line + m[2].rm_so, "errors", 6)) {
242 if (!strncasecmp(line + m[3].rm_so, "yes", 3))
243 options |= OPTION_ERRORS;
244 else
245 options &= ~(OPTION_ERRORS);
246 } else if (!strncasecmp(line + m[2].rm_so, "expunge", 7)) {
247 if (!strncasecmp(line + m[3].rm_so, "yes", 3))
248 options |= OPTION_EXPUNGE;
249 else
250 options &= ~(OPTION_EXPUNGE);
251 } else if (!strncasecmp(line + m[2].rm_so, "header", 6)) {
252 if (!strncasecmp(line + m[3].rm_so, "yes", 3))
253 options |= OPTION_HEADERS;
254 else
255 options &= ~(OPTION_HEADERS);
256 } else if (!strncasecmp(line + m[2].rm_so, "namespace", 9)) {
257 if (!strncasecmp(line + m[3].rm_so, "yes", 3))
258 options |= OPTION_NAMESPACE;
259 else
260 options &= ~(OPTION_NAMESPACE);
261 } else if (!strncasecmp(line + m[2].rm_so, "subscribe", 9)) {
262 if (!strncasecmp(line + m[3].rm_so, "yes", 3))
263 options |= OPTION_SUBSCRIBE;
264 else
265 options &= ~(OPTION_SUBSCRIBE);
266 } else if (!strncasecmp(line + m[2].rm_so, "warning", 7)) {
267 if (!strncasecmp(line + m[3].rm_so, "yes", 3))
268 options |= OPTION_WARNING;
269 else
270 options &= ~(OPTION_WARNING);
271 } else if (!strncasecmp(line + m[2].rm_so, "timeout", 7)) {
272 errno = 0;
273 timeout = strtol(line + m[3].rm_so, NULL, 10);
274 if (errno)
275 timeout = 0;
276 } else if (!strncasecmp(line + m[2].rm_so, "daemon", 6) &&
277 !(options & OPTION_DAEMON_MODE)) {
278 options |= OPTION_DAEMON_MODE;
279 errno = 0;
280 interval = strtoul(line + m[3].rm_so, NULL, 10);
281 if (errno)
282 interval = 0;
283 }
284 }
285
286
287 #ifdef ENCRYPTED_PASSWORDS
288 /*
289 * Open password file and call parse_passwords().
290 */
291 int
292 read_passwords(void)
293 {
294 FILE *fd;
295 char pwfile[PATH_MAX];
296
297 if (!(flags & FLAG_BLANK_PASSWORD))
298 return ERROR_CONFIG_PARSE;
299
300 passphr = (char *)smalloc(PASSPHRASE_LEN);
301 *passphr = '\0';
302
303 snprintf(pwfile, PATH_MAX, "%s/%s", home, ".imapfilter/passwords");
304 #ifdef DEBUG
305 fprintf(stderr, "debug: passwords file: '%s'\n", pwfile);
306 #endif
307
308 if (!exists_file(pwfile))
309 return ERROR_FILE_OPEN;
310
311 #ifdef CHECK_PERMISSIONS
312 check_file_perms(pwfile, S_IRUSR | S_IWUSR);
313 #endif
314
315 fd = fopen(pwfile, "r");
316 if (fd == NULL)
317 fatal(ERROR_FILE_OPEN, "opening passwords file %s; %s\n",
318 pwfile, strerror(errno));
319
320 parse_passwords(fd);
321
322 fclose(fd);
323
324 return 0;
325 }
326
327
328 /*
329 * Parse unencrypted password file.
330 */
331 int
332 parse_passwords(FILE * fd)
333 {
334 int t;
335 char *pe;
336 char user[USERNAME_LEN], serv[SERVER_LEN];
337 unsigned char *buf;
338 char *c, *cp, *line;
339 regex_t creg;
340 regmatch_t match[4];
341 const char *reg;
342 int r;
343
344 t = 3;
345 pe = NULL;
346 reg = "([[:alnum:].-]+) ([[:graph:]]+) ([[:graph:]]+)";
347
348
349 do {
350 fseek(fd, 0L, SEEK_SET);
351 printf("Enter master passphrase: ");
352 get_password(passphr, PASSPHRASE_LEN);
353 } while ((r = decrypt_passwords(&buf, fd)) && --t != 0);
354
355 if (!t)
356 return ERROR_PASSPHRASE;
357
358 c = cp = sstrdup(buf);
359
360 regcomp(&creg, reg, REG_EXTENDED | REG_ICASE);
361
362 line = strtok_r(c, "\n", &c);
363 while (line != NULL && !regexec(&creg, line, 4, match, 0)) {
364 user[0] = serv[0] = '\0';
365
366 strncat(serv, line + match[1].rm_so,
367 min(match[1].rm_eo - match[1].rm_so, SERVER_LEN - 1));
368 strncat(user, line + match[2].rm_so,
369 min(match[2].rm_eo - match[2].rm_so, USERNAME_LEN - 1));
370
371 if ((pe = (char *)find_password(user, serv)))
372 strncat(pe, line + match[3].rm_so,
373 min(match[3].rm_eo - match[3].rm_so,
374 PASSWORD_LEN - 1));
375
376 line = strtok_r(NULL, "\n", &c);
377 }
378
379 regfree(&creg);
380 sfree(cp);
381 sfree(buf);
382
383 return 0;
384 }
385
386
387 /*
388 * Store encrypted passwords to file.
389 */
390 int
391 store_passwords(account_t * accts[])
392 {
393 char pwfile[PATH_MAX];
394 FILE *fd;
395
396 snprintf(pwfile, PATH_MAX, "%s/%s", home, ".imapfilter/passwords");
397
398 create_file(pwfile, S_IRUSR | S_IWUSR);
399
400 fd = fopen(pwfile, "w");
401
402 if (fd == NULL)
403 fatal(ERROR_FILE_OPEN, "opening passwords file %s; %s\n",
404 pwfile, strerror(errno));
405
406 encrypt_passwords(fd, accts);
407
408 fclose(fd);
409
410 return 0;
411 }
412
413 #endif /* ENCRYPTED_PASSWORDS */
414
415
416 /*
417 * Create $HOME/.imapfilter directory.
418 */
419 int
420 create_homedir(void)
421 {
422 char *hdn;
423
424 hdn = ".imapfilter";
425
426 if (home != NULL)
427 if (chdir(home))
428 error("could not change directory; %s\n",
429 strerror(errno));
430
431 if (!exists_dir(hdn)) {
432 if (mkdir(hdn, S_IRUSR | S_IWUSR | S_IXUSR))
433 error("could not create directory %s; %s\n", hdn,
434 strerror(errno));
435 }
436 #ifdef CHECK_PERMISSIONS
437 else {
438 check_dir_perms(hdn, S_IRUSR | S_IWUSR | S_IXUSR);
439 }
440 #endif
441
442 return 0;
443 }
444
445
446 /*
447 * Check if a file exists.
448 */
449 int
450 exists_file(char *fname)
451 {
452 struct stat fs;
453
454 if (access(fname, F_OK))
455 return 0;
456
457 stat(fname, &fs);
458 if (!S_ISREG(fs.st_mode)) {
459 error("file %s not a regular file\n", fname);
460 return ERROR_FILE_OPEN;
461 }
462 return 1;
463 }
464
465
466 /*
467 * Check if a directory exists.
468 */
469 int
470 exists_dir(char *dname)
471 {
472 struct stat ds;
473
474 if (access(dname, F_OK))
475 return 0;
476
477 stat(dname, &ds);
478 if (!S_ISDIR(ds.st_mode)) {
479 error("file %s not a directory\n", dname);
480 return ERROR_FILE_OPEN;
481 }
482 return 1;
483 }
484
485
486 /*
487 * Create a file with the specified permissions.
488 */
489 int
490 create_file(char *fname, mode_t mode)
491 {
492 int fd;
493
494 fd = 0;
495
496 if (!exists_file(fname)) {
497 fd = open(fname, O_CREAT | O_WRONLY | O_TRUNC, mode);
498 if (fd == -1) {
499 error("could not create file %s; %s\n", fname,
500 strerror(errno));
501 return ERROR_FILE_OPEN;
502 }
503 close(fd);
504 }
505 return 0;
506 }
507
508
509 #ifdef CHECK_PERMISSIONS
510 /*
511 * Check the permissions of a file.
512 */
513 int
514 check_file_perms(char *fname, mode_t mode)
515 {
516 struct stat fs;
517
518 if (stat(fname, &fs)) {
519 error("getting file %s status; %s\n", fname,
520 strerror(errno));
521 return ERROR_TRIVIAL;
522 }
523 if (!S_ISREG(fs.st_mode)) {
524 error("file %s not a regular file\n", fname);
525 return ERROR_TRIVIAL;
526 }
527 if ((fs.st_mode & 00777) != mode) {
528 error("warning: improper file %s permissions\n", fname);
529 error("warning: file's mode should be %o not %o\n", mode,
530 fs.st_mode & 00777);
531 return ERROR_TRIVIAL;
532 }
533 return 0;
534 }
535
536
537 /*
538 * Check the permissions of a directory.
539 */
540 int
541 check_dir_perms(char *dname, mode_t mode)
542 {
543 struct stat ds;
544
545 if (stat(dname, &ds)) {
546 error("getting file %s status; %s\n", dname,
547 strerror(errno));
548 return ERROR_TRIVIAL;
549 }
550 if (!S_ISDIR(ds.st_mode)) {
551 error("file %s not a directory\n", dname);
552 return ERROR_TRIVIAL;
553 }
554 if ((ds.st_mode & 00777) != mode) {
555 error("warning: improper dir %s permissions\n", dname);
556 error("warning: dir's mode should be %o not %o\n", mode,
557 ds.st_mode & 00777);
558 return ERROR_TRIVIAL;
559 }
560 return 0;
561 }
562
563 #endif /* CHECK_PERMISSIONS */
564
565
566 #ifdef SSL_TLS
567 /*
568 * Get SSL/TLS certificate check it, maybe ask user about it and act
569 * accordingly.
570 */
571 int
572 imf_ssl_cert(SSL * ssl)
573 {
574 X509 *cert;
575 unsigned char md[EVP_MAX_MD_SIZE];
576 unsigned int mdlen;
577
578 mdlen = 0;
579
580 if (!(cert = SSL_get_peer_certificate(ssl)))
581 return ERROR_SSL;
582
583 if (!(X509_digest(cert, EVP_md5(), md, &mdlen)))
584 return ERROR_SSL;
585
586 switch (imf_ssl_check_cert(cert, md, &mdlen)) {
587 case SSL_CERT_NONEXISTENT:
588 imf_ssl_print_cert(cert, md, &mdlen);
589 if (flags & FLAG_DAEMON_MODE ||
590 imf_ssl_new_cert(cert) == SSL_CERT_ACTION_REJECT)
591 goto abort;
592 break;
593 case SSL_CERT_MISMATCH:
594 imf_ssl_print_cert(cert, md, &mdlen);
595 if (flags & FLAG_DAEMON_MODE ||
596 imf_ssl_cert_mismatch() == SSL_CERT_ACTION_ABORT)
597 goto abort;
598 break;
599 case SSL_CERT_OK:
600 if (options & OPTION_DETAILS_VERBOSE)
601 imf_ssl_print_cert(cert, md, &mdlen);
602 }
603
604 X509_free(cert);
605 return 0;
606
607 abort:
608 X509_free(cert);
609 return ERROR_SSL;
610 }
611
612
613 /*
614 * Check if the SSL/TLS certificate exists in the certificates file.
615 */
616 int
617 imf_ssl_check_cert(X509 * pcert, unsigned char *pmd, unsigned int *pmdlen)
618 {
619 int r;
620 FILE *fd;
621 X509 *cert;
622 unsigned char md[EVP_MAX_MD_SIZE];
623 unsigned int mdlen;
624 char *cfn;
625
626 r = SSL_CERT_NONEXISTENT;
627 cert = NULL;
628 cfn = ".imapfilter/certificates";
629
630 if (!exists_file(cfn))
631 return SSL_CERT_NONEXISTENT;
632
633 fd = fopen(cfn, "r");
634 if (fd == NULL)
635 return ERROR_FILE_OPEN;
636
637 while ((cert = PEM_read_X509(fd, &cert, NULL, NULL)) != NULL) {
638 if (X509_subject_name_cmp(cert, pcert) != 0 ||
639 X509_issuer_name_cmp(cert, pcert) != 0)
640 continue;
641
642 if (!X509_digest(cert, EVP_md5(), md, &mdlen) ||
643 *pmdlen != mdlen)
644 continue;
645
646 if (memcmp(pmd, md, mdlen) != 0) {
647 r = SSL_CERT_MISMATCH;
648 break;
649 }
650 r = SSL_CERT_OK;
651 break;
652 }
653
654 fclose(fd);
655 X509_free(cert);
656
657 return r;
658 }
659
660
661 /*
662 * Print information about the SSL/TLS certificate.
663 */
664 void
665 imf_ssl_print_cert(X509 * cert, unsigned char *md, unsigned int *mdlen)
666 {
667 unsigned int i;
668 char *c;
669
670 c = X509_NAME_oneline(X509_get_subject_name(cert), NULL, 0);
671 printf("Server certificate subject: %s\n", c);
672 xfree(c);
673
674 c = X509_NAME_oneline(X509_get_issuer_name(cert), NULL, 0);
675 printf("Server certificate issuer: %s\n", c);
676 xfree(c);
677
678 printf("Server key fingerprint: ");
679 for (i = 0; i < *mdlen; i++)
680 printf(i != *mdlen - 1 ? "%02X:" : "%02X\n", md[i]);
681 }
682
683
684 /*
685 * Ask the user to reject/accept the SSL/TLS certificate.
686 */
687 int
688 imf_ssl_new_cert(X509 * cert)
689 {
690 FILE *fd;
691 char c, *cfn, buf[LINE_MAX];
692
693 do {
694 printf("(R)eject, accept (t)emporarily or "
695 "accept (p)ermanently? ");
696 fgets(buf, LINE_MAX, stdin);
697 c = tolower(*buf);
698 } while (c != 'r' && c != 't' && c != 'p');
699
700 if (c == 'r')
701 return SSL_CERT_ACTION_REJECT;
702 else if (c == 't')
703 return SSL_CERT_ACTION_ACCEPT;
704
705 cfn = ".imapfilter/certificates";
706
707 create_file(cfn, S_IRUSR | S_IWUSR);
708
709 fd = fopen(cfn, "a");
710 if (fd == NULL)
711 return SSL_CERT_ACTION_REJECT;
712
713 PEM_write_X509(fd, cert);
714
715 fclose(fd);
716
717 return SSL_CERT_ACTION_ACCEPT;
718 }
719
720
721 /*
722 * Ask user to proceed, while a fingerprint mismatch in the SSL/TLS
723 * certificate was found.
724 */
725 int
726 imf_ssl_cert_mismatch(void)
727 {
728 char c, buf[LINE_MAX];
729
730 do {
731 printf("WARNING: SSL/TLS certificate fingerprint mismatch.\n"
732 "Proceed with the connection (y/n)? ");
733 fgets(buf, LINE_MAX, stdin);
734 c = tolower(*buf);
735 } while (c != 'y' && c != 'n');
736
737 if (c == 'y')
738 return SSL_CERT_ACTION_CONTINUE;
739 else
740 return SSL_CERT_ACTION_ABORT;
741 }
742
743 #endif /* SSL_TLS */

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