| 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 = NULL; /* 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$", |
| 147 |
|
| 148 |
"^[[:blank:]]*(SET[[:blank:]])?[[:blank:]]*(ERRORS|EXPUNGE|" |
| 149 |
"HEADERS|NAMESPACE|SUBSCRIBE)[[:blank:]]*=[[:blank:]]*" |
| 150 |
"(YES|NO)[[:blank:]]*\n$", |
| 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_unneeded(); |
| 209 |
|
| 210 |
return 0; |
| 211 |
} |
| 212 |
|
| 213 |
|
| 214 |
/* |
| 215 |
* Signal SIGHUP received, destroy all data structures and reread the |
| 216 |
* configuration file. |
| 217 |
*/ |
| 218 |
void |
| 219 |
reread_config(char *cfg) |
| 220 |
{ |
| 221 |
destroy_all(); |
| 222 |
read_config(cfg); |
| 223 |
read_passwords(); |
| 224 |
|
| 225 |
flags &= ~(FLAG_SIGHUP_RECEIVED); |
| 226 |
} |
| 227 |
|
| 228 |
|
| 229 |
/* |
| 230 |
* Set other options found in config file. |
| 231 |
*/ |
| 232 |
void |
| 233 |
set_options(char *line, regmatch_t * m) |
| 234 |
{ |
| 235 |
if (!strncasecmp(line + m[2].rm_so, "logfile", 7)) { |
| 236 |
if (*logfile == '\0') { |
| 237 |
if (*(line + m[3].rm_so) == '"' && |
| 238 |
*(line + m[3].rm_eo - 1) == '"') |
| 239 |
strncat(logfile, line + m[3].rm_so + 1, |
| 240 |
min((m[3].rm_eo - m[3].rm_so - 2), |
| 241 |
PATH_MAX - 1)); |
| 242 |
else |
| 243 |
strncat(logfile, line + m[3].rm_so, |
| 244 |
min((m[3].rm_eo - m[3].rm_so), |
| 245 |
PATH_MAX - 1)); |
| 246 |
} |
| 247 |
} else if (!strncasecmp(line + m[2].rm_so, "charset", 7)) { |
| 248 |
if (*(line + m[3].rm_so) == '"' && |
| 249 |
*(line + m[3].rm_eo - 1) == '"') |
| 250 |
strncat(charset, line + m[3].rm_so + 1, |
| 251 |
min((m[3].rm_eo - m[3].rm_so - 2), |
| 252 |
CHARSET_LEN - 1)); |
| 253 |
else |
| 254 |
strncat(charset, line + m[3].rm_so, |
| 255 |
min((m[3].rm_eo - m[3].rm_so), CHARSET_LEN - 1)); |
| 256 |
} else if (!strncasecmp(line + m[2].rm_so, "errors", 6)) { |
| 257 |
if (!strncasecmp(line + m[3].rm_so, "yes", 3)) |
| 258 |
options |= OPTION_ERRORS; |
| 259 |
else |
| 260 |
options &= ~(OPTION_ERRORS); |
| 261 |
} else if (!strncasecmp(line + m[2].rm_so, "expunge", 7)) { |
| 262 |
if (!strncasecmp(line + m[3].rm_so, "yes", 3)) |
| 263 |
options |= OPTION_EXPUNGE; |
| 264 |
else |
| 265 |
options &= ~(OPTION_EXPUNGE); |
| 266 |
} else if (!strncasecmp(line + m[2].rm_so, "header", 6)) { |
| 267 |
if (!strncasecmp(line + m[3].rm_so, "yes", 3)) |
| 268 |
options |= OPTION_HEADERS; |
| 269 |
else |
| 270 |
options &= ~(OPTION_HEADERS); |
| 271 |
} else if (!strncasecmp(line + m[2].rm_so, "namespace", 9)) { |
| 272 |
if (!strncasecmp(line + m[3].rm_so, "yes", 3)) |
| 273 |
options |= OPTION_NAMESPACE; |
| 274 |
else |
| 275 |
options &= ~(OPTION_NAMESPACE); |
| 276 |
} else if (!strncasecmp(line + m[2].rm_so, "subscribe", 9)) { |
| 277 |
if (!strncasecmp(line + m[3].rm_so, "yes", 3)) |
| 278 |
options |= OPTION_SUBSCRIBE; |
| 279 |
else |
| 280 |
options &= ~(OPTION_SUBSCRIBE); |
| 281 |
} else if (!strncasecmp(line + m[2].rm_so, "timeout", 7)) { |
| 282 |
errno = 0; |
| 283 |
timeout = strtol(line + m[3].rm_so, NULL, 10); |
| 284 |
if (errno) |
| 285 |
timeout = 0; |
| 286 |
} else if (!strncasecmp(line + m[2].rm_so, "daemon", 6) && |
| 287 |
!(options & OPTION_DAEMON_MODE)) { |
| 288 |
options |= OPTION_DAEMON_MODE; |
| 289 |
errno = 0; |
| 290 |
interval = strtoul(line + m[3].rm_so, NULL, 10); |
| 291 |
if (errno) |
| 292 |
interval = 0; |
| 293 |
} |
| 294 |
} |
| 295 |
|
| 296 |
|
| 297 |
#ifdef ENCRYPTED_PASSWORDS |
| 298 |
/* |
| 299 |
* Open password file and call parse_passwords(). |
| 300 |
*/ |
| 301 |
int |
| 302 |
read_passwords(void) |
| 303 |
{ |
| 304 |
FILE *fd; |
| 305 |
char pwfile[PATH_MAX]; |
| 306 |
|
| 307 |
if (!(flags & FLAG_BLANK_PASSWORD)) |
| 308 |
return ERROR_CONFIG_PARSE; |
| 309 |
|
| 310 |
snprintf(pwfile, PATH_MAX, "%s/%s", home, ".imapfilter/passwords"); |
| 311 |
#ifdef DEBUG |
| 312 |
fprintf(stderr, "debug: passwords file: '%s'\n", pwfile); |
| 313 |
#endif |
| 314 |
|
| 315 |
if (!exists_file(pwfile)) |
| 316 |
return ERROR_FILE_OPEN; |
| 317 |
|
| 318 |
#ifdef CHECK_PERMISSIONS |
| 319 |
check_file_perms(pwfile, S_IRUSR | S_IWUSR); |
| 320 |
#endif |
| 321 |
|
| 322 |
fd = fopen(pwfile, "r"); |
| 323 |
if (fd == NULL) |
| 324 |
fatal(ERROR_FILE_OPEN, "opening passwords file %s; %s\n", |
| 325 |
pwfile, strerror(errno)); |
| 326 |
|
| 327 |
parse_passwords(fd); |
| 328 |
|
| 329 |
fclose(fd); |
| 330 |
|
| 331 |
return 0; |
| 332 |
} |
| 333 |
|
| 334 |
|
| 335 |
/* |
| 336 |
* Parse unencrypted password file. |
| 337 |
*/ |
| 338 |
int |
| 339 |
parse_passwords(FILE * fd) |
| 340 |
{ |
| 341 |
int t; |
| 342 |
char *pe; |
| 343 |
char user[USERNAME_LEN], serv[SERVER_LEN]; |
| 344 |
unsigned char *buf; |
| 345 |
char *c, *cp, *line; |
| 346 |
regex_t creg; |
| 347 |
regmatch_t match[4]; |
| 348 |
const char *reg; |
| 349 |
int r; |
| 350 |
|
| 351 |
t = 3; |
| 352 |
pe = NULL; |
| 353 |
reg = "([[:alnum:].-]+) ([[:graph:]]+) ([[:graph:]]+)"; |
| 354 |
|
| 355 |
if (!passphr) { |
| 356 |
passphr = (char *)smalloc(PASSPHRASE_LEN); |
| 357 |
*passphr = '\0'; |
| 358 |
|
| 359 |
do { |
| 360 |
fseek(fd, 0L, SEEK_SET); |
| 361 |
printf("Enter master passphrase: "); |
| 362 |
get_password(passphr, PASSPHRASE_LEN); |
| 363 |
} while ((r = decrypt_passwords(&buf, fd)) && --t != 0); |
| 364 |
|
| 365 |
if (!t) |
| 366 |
return ERROR_PASSPHRASE; |
| 367 |
} else |
| 368 |
decrypt_passwords(&buf, fd); |
| 369 |
|
| 370 |
c = cp = sstrdup(buf); |
| 371 |
|
| 372 |
regcomp(&creg, reg, REG_EXTENDED | REG_ICASE); |
| 373 |
|
| 374 |
line = strtok_r(c, "\n", &c); |
| 375 |
while (line != NULL && !regexec(&creg, line, 4, match, 0)) { |
| 376 |
user[0] = serv[0] = '\0'; |
| 377 |
|
| 378 |
strncat(serv, line + match[1].rm_so, |
| 379 |
min(match[1].rm_eo - match[1].rm_so, SERVER_LEN - 1)); |
| 380 |
strncat(user, line + match[2].rm_so, |
| 381 |
min(match[2].rm_eo - match[2].rm_so, USERNAME_LEN - 1)); |
| 382 |
|
| 383 |
if ((pe = (char *)find_password(user, serv))) |
| 384 |
strncat(pe, line + match[3].rm_so, |
| 385 |
min(match[3].rm_eo - match[3].rm_so, |
| 386 |
PASSWORD_LEN - 1)); |
| 387 |
|
| 388 |
line = strtok_r(NULL, "\n", &c); |
| 389 |
} |
| 390 |
|
| 391 |
regfree(&creg); |
| 392 |
sfree(cp); |
| 393 |
sfree(buf); |
| 394 |
|
| 395 |
return 0; |
| 396 |
} |
| 397 |
|
| 398 |
|
| 399 |
/* |
| 400 |
* Store encrypted passwords to file. |
| 401 |
*/ |
| 402 |
int |
| 403 |
store_passwords(account_t * accts[]) |
| 404 |
{ |
| 405 |
char pwfile[PATH_MAX]; |
| 406 |
FILE *fd; |
| 407 |
|
| 408 |
snprintf(pwfile, PATH_MAX, "%s/%s", home, ".imapfilter/passwords"); |
| 409 |
|
| 410 |
create_file(pwfile, S_IRUSR | S_IWUSR); |
| 411 |
|
| 412 |
fd = fopen(pwfile, "w"); |
| 413 |
|
| 414 |
if (fd == NULL) |
| 415 |
fatal(ERROR_FILE_OPEN, "opening passwords file %s; %s\n", |
| 416 |
pwfile, strerror(errno)); |
| 417 |
|
| 418 |
encrypt_passwords(fd, accts); |
| 419 |
|
| 420 |
fclose(fd); |
| 421 |
|
| 422 |
return 0; |
| 423 |
} |
| 424 |
|
| 425 |
#endif /* ENCRYPTED_PASSWORDS */ |
| 426 |
|
| 427 |
|
| 428 |
/* |
| 429 |
* Create $HOME/.imapfilter directory. |
| 430 |
*/ |
| 431 |
int |
| 432 |
create_homedir(void) |
| 433 |
{ |
| 434 |
char *hdn; |
| 435 |
|
| 436 |
hdn = ".imapfilter"; |
| 437 |
|
| 438 |
if (home != NULL) |
| 439 |
if (chdir(home)) |
| 440 |
error("could not change directory; %s\n", |
| 441 |
strerror(errno)); |
| 442 |
|
| 443 |
if (!exists_dir(hdn)) { |
| 444 |
if (mkdir(hdn, S_IRUSR | S_IWUSR | S_IXUSR)) |
| 445 |
error("could not create directory %s; %s\n", hdn, |
| 446 |
strerror(errno)); |
| 447 |
} |
| 448 |
#ifdef CHECK_PERMISSIONS |
| 449 |
else { |
| 450 |
check_dir_perms(hdn, S_IRUSR | S_IWUSR | S_IXUSR); |
| 451 |
} |
| 452 |
#endif |
| 453 |
|
| 454 |
return 0; |
| 455 |
} |
| 456 |
|
| 457 |
|
| 458 |
/* |
| 459 |
* Check if a file exists. |
| 460 |
*/ |
| 461 |
int |
| 462 |
exists_file(char *fname) |
| 463 |
{ |
| 464 |
struct stat fs; |
| 465 |
|
| 466 |
if (access(fname, F_OK)) |
| 467 |
return 0; |
| 468 |
|
| 469 |
stat(fname, &fs); |
| 470 |
if (!S_ISREG(fs.st_mode)) { |
| 471 |
error("file %s not a regular file\n", fname); |
| 472 |
return ERROR_FILE_OPEN; |
| 473 |
} |
| 474 |
return 1; |
| 475 |
} |
| 476 |
|
| 477 |
|
| 478 |
/* |
| 479 |
* Check if a directory exists. |
| 480 |
*/ |
| 481 |
int |
| 482 |
exists_dir(char *dname) |
| 483 |
{ |
| 484 |
struct stat ds; |
| 485 |
|
| 486 |
if (access(dname, F_OK)) |
| 487 |
return 0; |
| 488 |
|
| 489 |
stat(dname, &ds); |
| 490 |
if (!S_ISDIR(ds.st_mode)) { |
| 491 |
error("file %s not a directory\n", dname); |
| 492 |
return ERROR_FILE_OPEN; |
| 493 |
} |
| 494 |
return 1; |
| 495 |
} |
| 496 |
|
| 497 |
|
| 498 |
/* |
| 499 |
* Create a file with the specified permissions. |
| 500 |
*/ |
| 501 |
int |
| 502 |
create_file(char *fname, mode_t mode) |
| 503 |
{ |
| 504 |
int fd; |
| 505 |
|
| 506 |
fd = 0; |
| 507 |
|
| 508 |
if (!exists_file(fname)) { |
| 509 |
fd = open(fname, O_CREAT | O_WRONLY | O_TRUNC, mode); |
| 510 |
if (fd == -1) { |
| 511 |
error("could not create file %s; %s\n", fname, |
| 512 |
strerror(errno)); |
| 513 |
return ERROR_FILE_OPEN; |
| 514 |
} |
| 515 |
close(fd); |
| 516 |
} |
| 517 |
return 0; |
| 518 |
} |
| 519 |
|
| 520 |
|
| 521 |
#ifdef CHECK_PERMISSIONS |
| 522 |
/* |
| 523 |
* Check the permissions of a file. |
| 524 |
*/ |
| 525 |
int |
| 526 |
check_file_perms(char *fname, mode_t mode) |
| 527 |
{ |
| 528 |
struct stat fs; |
| 529 |
|
| 530 |
if (stat(fname, &fs)) { |
| 531 |
error("getting file %s status; %s\n", fname, |
| 532 |
strerror(errno)); |
| 533 |
return ERROR_TRIVIAL; |
| 534 |
} |
| 535 |
if (!S_ISREG(fs.st_mode)) { |
| 536 |
error("file %s not a regular file\n", fname); |
| 537 |
return ERROR_TRIVIAL; |
| 538 |
} |
| 539 |
if ((fs.st_mode & 00777) != mode) { |
| 540 |
error("warning: improper file %s permissions\n", fname); |
| 541 |
error("warning: file's mode should be %o not %o\n", mode, |
| 542 |
fs.st_mode & 00777); |
| 543 |
return ERROR_TRIVIAL; |
| 544 |
} |
| 545 |
return 0; |
| 546 |
} |
| 547 |
|
| 548 |
|
| 549 |
/* |
| 550 |
* Check the permissions of a directory. |
| 551 |
*/ |
| 552 |
int |
| 553 |
check_dir_perms(char *dname, mode_t mode) |
| 554 |
{ |
| 555 |
struct stat ds; |
| 556 |
|
| 557 |
if (stat(dname, &ds)) { |
| 558 |
error("getting file %s status; %s\n", dname, |
| 559 |
strerror(errno)); |
| 560 |
return ERROR_TRIVIAL; |
| 561 |
} |
| 562 |
if (!S_ISDIR(ds.st_mode)) { |
| 563 |
error("file %s not a directory\n", dname); |
| 564 |
return ERROR_TRIVIAL; |
| 565 |
} |
| 566 |
if ((ds.st_mode & 00777) != mode) { |
| 567 |
error("warning: improper dir %s permissions\n", dname); |
| 568 |
error("warning: dir's mode should be %o not %o\n", mode, |
| 569 |
ds.st_mode & 00777); |
| 570 |
return ERROR_TRIVIAL; |
| 571 |
} |
| 572 |
return 0; |
| 573 |
} |
| 574 |
|
| 575 |
#endif /* CHECK_PERMISSIONS */ |
| 576 |
|
| 577 |
|
| 578 |
#ifdef SSL_TLS |
| 579 |
/* |
| 580 |
* Get SSL/TLS certificate check it, maybe ask user about it and act |
| 581 |
* accordingly. |
| 582 |
*/ |
| 583 |
int |
| 584 |
imf_ssl_cert(SSL * ssl) |
| 585 |
{ |
| 586 |
X509 *cert; |
| 587 |
unsigned char md[EVP_MAX_MD_SIZE]; |
| 588 |
unsigned int mdlen; |
| 589 |
|
| 590 |
mdlen = 0; |
| 591 |
|
| 592 |
if (!(cert = SSL_get_peer_certificate(ssl))) |
| 593 |
return ERROR_SSL; |
| 594 |
|
| 595 |
if (!(X509_digest(cert, EVP_md5(), md, &mdlen))) |
| 596 |
return ERROR_SSL; |
| 597 |
|
| 598 |
switch (imf_ssl_check_cert(cert, md, &mdlen)) { |
| 599 |
case SSL_CERT_NONEXISTENT: |
| 600 |
imf_ssl_print_cert(cert, md, &mdlen); |
| 601 |
if (flags & FLAG_DAEMON_MODE || |
| 602 |
imf_ssl_new_cert(cert) == SSL_CERT_ACTION_REJECT) |
| 603 |
goto abort; |
| 604 |
break; |
| 605 |
case SSL_CERT_MISMATCH: |
| 606 |
imf_ssl_print_cert(cert, md, &mdlen); |
| 607 |
if (flags & FLAG_DAEMON_MODE || |
| 608 |
imf_ssl_cert_mismatch() == SSL_CERT_ACTION_ABORT) |
| 609 |
goto abort; |
| 610 |
break; |
| 611 |
case SSL_CERT_OK: |
| 612 |
if (options & OPTION_DETAILS_VERBOSE) |
| 613 |
imf_ssl_print_cert(cert, md, &mdlen); |
| 614 |
} |
| 615 |
|
| 616 |
X509_free(cert); |
| 617 |
return 0; |
| 618 |
|
| 619 |
abort: |
| 620 |
X509_free(cert); |
| 621 |
return ERROR_SSL; |
| 622 |
} |
| 623 |
|
| 624 |
|
| 625 |
/* |
| 626 |
* Check if the SSL/TLS certificate exists in the certificates file. |
| 627 |
*/ |
| 628 |
int |
| 629 |
imf_ssl_check_cert(X509 * pcert, unsigned char *pmd, unsigned int *pmdlen) |
| 630 |
{ |
| 631 |
int r; |
| 632 |
FILE *fd; |
| 633 |
X509 *cert; |
| 634 |
unsigned char md[EVP_MAX_MD_SIZE]; |
| 635 |
unsigned int mdlen; |
| 636 |
char *cfn; |
| 637 |
|
| 638 |
r = SSL_CERT_NONEXISTENT; |
| 639 |
cert = NULL; |
| 640 |
cfn = ".imapfilter/certificates"; |
| 641 |
|
| 642 |
if (!exists_file(cfn)) |
| 643 |
return SSL_CERT_NONEXISTENT; |
| 644 |
|
| 645 |
fd = fopen(cfn, "r"); |
| 646 |
if (fd == NULL) |
| 647 |
return ERROR_FILE_OPEN; |
| 648 |
|
| 649 |
while ((cert = PEM_read_X509(fd, &cert, NULL, NULL)) != NULL) { |
| 650 |
if (X509_subject_name_cmp(cert, pcert) != 0 || |
| 651 |
X509_issuer_name_cmp(cert, pcert) != 0) |
| 652 |
continue; |
| 653 |
|
| 654 |
if (!X509_digest(cert, EVP_md5(), md, &mdlen) || |
| 655 |
*pmdlen != mdlen) |
| 656 |
continue; |
| 657 |
|
| 658 |
if (memcmp(pmd, md, mdlen) != 0) { |
| 659 |
r = SSL_CERT_MISMATCH; |
| 660 |
break; |
| 661 |
} |
| 662 |
r = SSL_CERT_OK; |
| 663 |
break; |
| 664 |
} |
| 665 |
|
| 666 |
fclose(fd); |
| 667 |
X509_free(cert); |
| 668 |
|
| 669 |
return r; |
| 670 |
} |
| 671 |
|
| 672 |
|
| 673 |
/* |
| 674 |
* Print information about the SSL/TLS certificate. |
| 675 |
*/ |
| 676 |
void |
| 677 |
imf_ssl_print_cert(X509 * cert, unsigned char *md, unsigned int *mdlen) |
| 678 |
{ |
| 679 |
unsigned int i; |
| 680 |
char *c; |
| 681 |
|
| 682 |
c = X509_NAME_oneline(X509_get_subject_name(cert), NULL, 0); |
| 683 |
printf("Server certificate subject: %s\n", c); |
| 684 |
xfree(c); |
| 685 |
|
| 686 |
c = X509_NAME_oneline(X509_get_issuer_name(cert), NULL, 0); |
| 687 |
printf("Server certificate issuer: %s\n", c); |
| 688 |
xfree(c); |
| 689 |
|
| 690 |
printf("Server key fingerprint: "); |
| 691 |
for (i = 0; i < *mdlen; i++) |
| 692 |
printf(i != *mdlen - 1 ? "%02X:" : "%02X\n", md[i]); |
| 693 |
} |
| 694 |
|
| 695 |
|
| 696 |
/* |
| 697 |
* Ask the user to reject/accept the SSL/TLS certificate. |
| 698 |
*/ |
| 699 |
int |
| 700 |
imf_ssl_new_cert(X509 * cert) |
| 701 |
{ |
| 702 |
FILE *fd; |
| 703 |
char c, *cfn, buf[LINE_MAX]; |
| 704 |
|
| 705 |
do { |
| 706 |
printf("(R)eject, accept (t)emporarily or " |
| 707 |
"accept (p)ermanently? "); |
| 708 |
fgets(buf, LINE_MAX, stdin); |
| 709 |
c = tolower(*buf); |
| 710 |
} while (c != 'r' && c != 't' && c != 'p'); |
| 711 |
|
| 712 |
if (c == 'r') |
| 713 |
return SSL_CERT_ACTION_REJECT; |
| 714 |
else if (c == 't') |
| 715 |
return SSL_CERT_ACTION_ACCEPT; |
| 716 |
|
| 717 |
cfn = ".imapfilter/certificates"; |
| 718 |
|
| 719 |
create_file(cfn, S_IRUSR | S_IWUSR); |
| 720 |
|
| 721 |
fd = fopen(cfn, "a"); |
| 722 |
if (fd == NULL) |
| 723 |
return SSL_CERT_ACTION_REJECT; |
| 724 |
|
| 725 |
PEM_write_X509(fd, cert); |
| 726 |
|
| 727 |
fclose(fd); |
| 728 |
|
| 729 |
return SSL_CERT_ACTION_ACCEPT; |
| 730 |
} |
| 731 |
|
| 732 |
|
| 733 |
/* |
| 734 |
* Ask user to proceed, while a fingerprint mismatch in the SSL/TLS |
| 735 |
* certificate was found. |
| 736 |
*/ |
| 737 |
int |
| 738 |
imf_ssl_cert_mismatch(void) |
| 739 |
{ |
| 740 |
char c, buf[LINE_MAX]; |
| 741 |
|
| 742 |
do { |
| 743 |
printf("WARNING: SSL/TLS certificate fingerprint mismatch.\n" |
| 744 |
"Proceed with the connection (y/n)? "); |
| 745 |
fgets(buf, LINE_MAX, stdin); |
| 746 |
c = tolower(*buf); |
| 747 |
} while (c != 'y' && c != 'n'); |
| 748 |
|
| 749 |
if (c == 'y') |
| 750 |
return SSL_CERT_ACTION_CONTINUE; |
| 751 |
else |
| 752 |
return SSL_CERT_ACTION_ABORT; |
| 753 |
} |
| 754 |
|
| 755 |
#endif /* SSL_TLS */ |
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