| 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 <limits.h> |
| 9 |
#include <sys/stat.h> |
| 10 |
#include <fcntl.h> |
| 11 |
#include <time.h> |
| 12 |
|
| 13 |
#include "config.h" |
| 14 |
#include "imapfilter.h" |
| 15 |
#include "data.h" |
| 16 |
|
| 17 |
|
| 18 |
extern char logfile[PATH_MAX]; |
| 19 |
extern unsigned int options; |
| 20 |
extern unsigned int flags; |
| 21 |
extern unsigned int interval; |
| 22 |
extern long timeout; |
| 23 |
extern char *home; |
| 24 |
|
| 25 |
#ifdef ENCRYPTED_PASSWORDS |
| 26 |
char *passphr; /* Master password to access the passwords |
| 27 |
file. */ |
| 28 |
#endif |
| 29 |
|
| 30 |
|
| 31 |
/* |
| 32 |
* Find the path to configuration file, open it and call parse_config(). |
| 33 |
*/ |
| 34 |
int read_config(char *cfg) |
| 35 |
{ |
| 36 |
int r; |
| 37 |
FILE *fd; |
| 38 |
char *c = NULL; |
| 39 |
|
| 40 |
if (!cfg) { |
| 41 |
cfg = c = (char *)xmalloc(PATH_MAX * sizeof(char)); |
| 42 |
snprintf(cfg, PATH_MAX, "%s/%s", home, ".imapfilterrc"); |
| 43 |
} |
| 44 |
#ifdef DEBUG |
| 45 |
printf("debug: configuration file: '%s'\n", cfg); |
| 46 |
#endif |
| 47 |
#ifdef CHECK_PERMISSIONS |
| 48 |
check_file_perms(cfg, S_IRUSR | S_IWUSR); |
| 49 |
#endif |
| 50 |
fd = fopen(cfg, "r"); |
| 51 |
|
| 52 |
if (!fd) |
| 53 |
fatal(ERROR_FILE_OPEN, "imapfilter: opening config file %s; %s\n", |
| 54 |
cfg, strerror(errno)); |
| 55 |
|
| 56 |
if (c) |
| 57 |
xfree(c); |
| 58 |
|
| 59 |
if ((r = parse_config(fd))) |
| 60 |
fatal(ERROR_CONFIG_PARSE, |
| 61 |
"imapfilter: parse error in config file at row %d\n", r); |
| 62 |
|
| 63 |
fclose(fd); |
| 64 |
|
| 65 |
#ifdef DEBUG |
| 66 |
printf("debug: options: %0#10x\n", options); |
| 67 |
#endif |
| 68 |
|
| 69 |
return 0; |
| 70 |
} |
| 71 |
|
| 72 |
|
| 73 |
/* |
| 74 |
* Parse configuration file. |
| 75 |
*/ |
| 76 |
int parse_config(FILE * fd) |
| 77 |
{ |
| 78 |
int i, r = 0; |
| 79 |
unsigned int row = 0; |
| 80 |
char line[LINE_MAX]; |
| 81 |
regex_t creg[13]; |
| 82 |
regmatch_t match[9]; |
| 83 |
const char *reg[13] = { |
| 84 |
"^([[:blank:]]*\n|#.*\n)$", |
| 85 |
|
| 86 |
"^[[:blank:]]*ACCOUNT[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]+" |
| 87 |
"(([[:graph:]]+):([[:graph:]]*)|([[:graph:]]+))@([[:alnum:].-]+)" |
| 88 |
"(:[[:digit:]]+)?[[:blank:]]*([[:blank:]]SSL|[[:blank:]]SSL2|" |
| 89 |
"[[:blank:]]SSL3|[[:blank:]]TLS1)?[[:blank:]]*\n$", |
| 90 |
|
| 91 |
"^[[:blank:]]*FOLDER[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]+" |
| 92 |
"([[:print:]]+)[[:blank:]]*\n$", |
| 93 |
|
| 94 |
"^[[:blank:]]*FILTER[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]*" |
| 95 |
"([[:blank:]]OR|[[:blank:]]AND)?[[:blank:]]*\n$", |
| 96 |
|
| 97 |
"^[[:blank:]]*ACTION[[:blank:]]+(DELETE|" |
| 98 |
"COPY[[:blank:]]+(\"[[:print:]]*\"|[[:graph:]]+)|" |
| 99 |
"MOVE[[:blank:]]+(\"[[:print:]]*\"|[[:graph:]]+)|" |
| 100 |
"RCOPY[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]+" |
| 101 |
"(\"[[:print:]]*\"|[[:graph:]]+)|" |
| 102 |
"RMOVE[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]+" |
| 103 |
"(\"[[:print:]]*\"|[[:graph:]]+)|" |
| 104 |
"LIST)[[:blank:]]*([[:graph:]]*)[[:blank:]]*\n$", |
| 105 |
|
| 106 |
"^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|" |
| 107 |
"AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*" |
| 108 |
"(ANSWERED|DELETED|DRAFT|FLAGGED|NEW|OLD|RECENT|SEEN|UNANSWERED|" |
| 109 |
"UNDELETED|UNDRAFT|UNFLAGGED|UNSEEN)[[:blank:]]*\n$", |
| 110 |
|
| 111 |
"^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|" |
| 112 |
"AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*" |
| 113 |
"(BCC|BODY|CC|FROM|SUBJECT|TEXT|TO)[[:blank:]]+(\"[[:print:]]*\"|" |
| 114 |
"[[:graph:]]+)[[:blank:]]*\n$", |
| 115 |
|
| 116 |
"^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|" |
| 117 |
"AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*" |
| 118 |
"(HEADER)[[:blank:]]+(\"[[:print:]]*\"|[[:graph:]]+)[[:blank:]]+" |
| 119 |
"(\"[[:print:]]*\"|[[:graph:]]+)[[:blank:]]*\n$", |
| 120 |
|
| 121 |
"^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|" |
| 122 |
"AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*" |
| 123 |
"(LARGER|SMALLER|OLDER|NEWER)[[:blank:]]+([[:digit:]]+)" |
| 124 |
"[[:blank:]]*\n$", |
| 125 |
|
| 126 |
"^[[:blank:]]*JOB[[:blank:]]+([[:alnum:],_-]+)[[:blank:]]+" |
| 127 |
"([[:alnum:],_-]+)[[:blank:]]*\n$", |
| 128 |
|
| 129 |
"^[[:blank:]]*(SET[[:blank:]])?[[:blank:]]*(LOGFILE)" |
| 130 |
"[[:blank:]]*=[[:blank:]]*([[:print:]]+)\n$", |
| 131 |
|
| 132 |
"^[[:blank:]]*(SET[[:blank:]])?[[:blank:]]*(HEADERS|NAMESPACE|EXPUNGE)" |
| 133 |
"[[:blank:]]*=[[:blank:]]*(YES|NO)[[:blank:]]*\n$", |
| 134 |
|
| 135 |
"^[[:blank:]]*(SET[[:blank:]])?[[:blank:]]*(DAEMON|TIMEOUT)" |
| 136 |
"[[:blank:]]*=[[:blank:]]*([[:digit:]]+)\n$" |
| 137 |
}; |
| 138 |
|
| 139 |
for (i = 0; i < 13; i++) |
| 140 |
regcomp(&creg[i], reg[i], REG_EXTENDED | REG_ICASE); |
| 141 |
|
| 142 |
while (fgets(line, LINE_MAX - 1, fd)) { |
| 143 |
row++; |
| 144 |
if (!regexec(&creg[0], line, 0, match, 0)) |
| 145 |
continue; |
| 146 |
else if (!regexec(&creg[1], line, 9, match, 0)) |
| 147 |
set_account(line, match); |
| 148 |
else if (!regexec(&creg[2], line, 3, match, 0)) |
| 149 |
r = set_mboxgrp(line, match); |
| 150 |
else if (!regexec(&creg[3], line, 3, match, 0)) |
| 151 |
r = set_filter(line, match); |
| 152 |
else if (!regexec(&creg[4], line, 9, match, 0)) |
| 153 |
r = set_action(line, match); |
| 154 |
else if (!regexec(&creg[5], line, 7, match, 0) || |
| 155 |
!regexec(&creg[6], line, 7, match, 0) || |
| 156 |
!regexec(&creg[7], line, 7, match, 0) || |
| 157 |
!regexec(&creg[8], line, 7, match, 0)) |
| 158 |
r = set_mask(line, match); |
| 159 |
else if (!regexec(&creg[9], line, 3, match, 0)) |
| 160 |
r = set_job(line, match); |
| 161 |
else if (!regexec(&creg[10], line, 4, match, 0) || |
| 162 |
!regexec(&creg[11], line, 4, match, 0) || |
| 163 |
!regexec(&creg[12], line, 4, match, 0)) |
| 164 |
set_options(line, match); |
| 165 |
else |
| 166 |
return row; |
| 167 |
|
| 168 |
if (r == ERROR_CONFIG_PARSE) |
| 169 |
return row; |
| 170 |
} |
| 171 |
|
| 172 |
for (i = 0; i < 13; i++) |
| 173 |
regfree(&creg[i]); |
| 174 |
|
| 175 |
destroy_data(); |
| 176 |
|
| 177 |
return 0; |
| 178 |
} |
| 179 |
|
| 180 |
|
| 181 |
/* |
| 182 |
* Set other options found in config file. |
| 183 |
*/ |
| 184 |
void set_options(char *line, regmatch_t * match) |
| 185 |
{ |
| 186 |
if (!strncasecmp(line + match[2].rm_so, "logfile", 7)) { |
| 187 |
if (!*logfile) |
| 188 |
strncat(logfile, line + match[3].rm_so, |
| 189 |
min((match[3].rm_eo - match[3].rm_so), PATH_MAX - 1)); |
| 190 |
} else if (!strncasecmp(line + match[2].rm_so, "header", 6)) { |
| 191 |
if (!strncasecmp(line + match[3].rm_so, "yes", 3)) |
| 192 |
options |= OPTION_HEADERS; |
| 193 |
else |
| 194 |
options &= ~(OPTION_HEADERS); |
| 195 |
} else if (!strncasecmp(line + match[2].rm_so, "namespace", 9)) { |
| 196 |
if (!strncasecmp(line + match[3].rm_so, "yes", 3)) |
| 197 |
options |= OPTION_NAMESPACE; |
| 198 |
else |
| 199 |
options &= ~(OPTION_NAMESPACE); |
| 200 |
} else if (!strncasecmp(line + match[2].rm_so, "expunge", 7)) { |
| 201 |
if (!strncasecmp(line + match[3].rm_so, "yes", 3)) |
| 202 |
options |= OPTION_EXPUNGE; |
| 203 |
else |
| 204 |
options &= ~(OPTION_EXPUNGE); |
| 205 |
} else if (!strncasecmp(line + match[2].rm_so, "timeout", 7)) { |
| 206 |
errno = 0; |
| 207 |
timeout = strtol(line + match[3].rm_so, NULL, 10); |
| 208 |
if (errno) |
| 209 |
timeout = 0; |
| 210 |
} else if (!strncasecmp(line + match[2].rm_so, "daemon", 6) && |
| 211 |
!(options & OPTION_DAEMON_MODE)) { |
| 212 |
options |= OPTION_DAEMON_MODE; |
| 213 |
errno = 0; |
| 214 |
interval = strtoul(line + match[3].rm_so, NULL, 10); |
| 215 |
if (errno) |
| 216 |
interval = 0; |
| 217 |
} |
| 218 |
} |
| 219 |
|
| 220 |
|
| 221 |
#ifdef ENCRYPTED_PASSWORDS |
| 222 |
/* |
| 223 |
* Open password file and call parse_passwords(). |
| 224 |
*/ |
| 225 |
int read_passwords(void) |
| 226 |
{ |
| 227 |
FILE *fd; |
| 228 |
char pwfile[PATH_MAX]; |
| 229 |
|
| 230 |
if (!(flags & FLAG_BLANK_PASSWORD)) |
| 231 |
return ERROR_CONFIG_PARSE; |
| 232 |
|
| 233 |
passphr = (char *)smalloc(PASSPHRASE_LEN); |
| 234 |
*passphr = 0; |
| 235 |
|
| 236 |
snprintf(pwfile, PATH_MAX, "%s/%s", home, ".imapfilter/passwords"); |
| 237 |
#ifdef DEBUG |
| 238 |
printf("debug: passwords file: '%s'\n", pwfile); |
| 239 |
#endif |
| 240 |
|
| 241 |
if (!exists_file(pwfile)) |
| 242 |
return ERROR_FILE_OPEN; |
| 243 |
|
| 244 |
#ifdef CHECK_PERMISSIONS |
| 245 |
check_file_perms(pwfile, S_IRUSR | S_IWUSR); |
| 246 |
#endif |
| 247 |
|
| 248 |
fd = fopen(pwfile, "r"); |
| 249 |
|
| 250 |
if (!fd) |
| 251 |
fatal(ERROR_FILE_OPEN, "imapfilter: opening passwords file %s; %s\n", |
| 252 |
pwfile, strerror(errno)); |
| 253 |
|
| 254 |
parse_passwords(fd); |
| 255 |
|
| 256 |
fclose(fd); |
| 257 |
|
| 258 |
return 0; |
| 259 |
} |
| 260 |
|
| 261 |
|
| 262 |
/* |
| 263 |
* Parse unencrypted password file. |
| 264 |
*/ |
| 265 |
int parse_passwords(FILE * fd) |
| 266 |
{ |
| 267 |
int t = 3; |
| 268 |
char *pe = NULL; |
| 269 |
char user[USERNAME_LEN], serv[SERVER_LEN]; |
| 270 |
unsigned char *buf; |
| 271 |
char *c, *cp, *line; |
| 272 |
regex_t creg; |
| 273 |
regmatch_t match[4]; |
| 274 |
const char *reg = "([[:alnum:].-]+) ([[:graph:]]+) ([[:graph:]]+)"; |
| 275 |
int r; |
| 276 |
|
| 277 |
do { |
| 278 |
fseek(fd, 0L, SEEK_SET); |
| 279 |
printf("Enter master passphrase: "); |
| 280 |
get_password(passphr, PASSPHRASE_LEN); |
| 281 |
} while ((r = decrypt_passwords(&buf, fd)) && --t); |
| 282 |
|
| 283 |
if (!t) |
| 284 |
return ERROR_PASSPHRASE; |
| 285 |
|
| 286 |
c = cp = sstrdup(buf); |
| 287 |
|
| 288 |
regcomp(&creg, reg, REG_EXTENDED | REG_ICASE); |
| 289 |
|
| 290 |
while ((line = strsep(&c, "\n")) && |
| 291 |
!regexec(&creg, line, 4, match, 0)) { |
| 292 |
user[0] = serv[0] = 0; |
| 293 |
|
| 294 |
strncat(serv, line + match[1].rm_so, |
| 295 |
min(match[1].rm_eo - match[1].rm_so, SERVER_LEN - 1)); |
| 296 |
strncat(user, line + match[2].rm_so, |
| 297 |
min(match[2].rm_eo - match[2].rm_so, USERNAME_LEN - 1)); |
| 298 |
|
| 299 |
if ((pe = (char *)find_password(user, serv))) |
| 300 |
strncat(pe, line + match[3].rm_so, |
| 301 |
min(match[3].rm_eo - match[3].rm_so, PASSWORD_LEN - 1)); |
| 302 |
} |
| 303 |
|
| 304 |
regfree(&creg); |
| 305 |
sfree(cp); |
| 306 |
sfree(buf); |
| 307 |
|
| 308 |
return 0; |
| 309 |
} |
| 310 |
|
| 311 |
|
| 312 |
/* |
| 313 |
* Store encrypted passwords to file. |
| 314 |
*/ |
| 315 |
int store_passwords(account_t * accts[]) |
| 316 |
{ |
| 317 |
char pwfile[PATH_MAX]; |
| 318 |
FILE *fd; |
| 319 |
|
| 320 |
snprintf(pwfile, PATH_MAX, "%s/%s", home, ".imapfilter/passwords"); |
| 321 |
|
| 322 |
create_file(pwfile, S_IRUSR | S_IWUSR); |
| 323 |
|
| 324 |
fd = fopen(pwfile, "w"); |
| 325 |
|
| 326 |
if (!fd) |
| 327 |
fatal(ERROR_FILE_OPEN, "imapfilter: opening passwords file %s; %s\n", |
| 328 |
pwfile, strerror(errno)); |
| 329 |
|
| 330 |
encrypt_passwords(fd, accts); |
| 331 |
|
| 332 |
fclose(fd); |
| 333 |
|
| 334 |
return 0; |
| 335 |
} |
| 336 |
|
| 337 |
#endif |
| 338 |
|
| 339 |
|
| 340 |
/* |
| 341 |
* Create $HOME/.imapfilter directory. |
| 342 |
*/ |
| 343 |
int create_homedir(void) |
| 344 |
{ |
| 345 |
char *hdn = ".imapfilter"; |
| 346 |
|
| 347 |
if (home) |
| 348 |
if (chdir(home)) |
| 349 |
error("imapfilter: could not change directory; %s\n", |
| 350 |
strerror(errno)); |
| 351 |
|
| 352 |
if (!exists_dir(hdn)) |
| 353 |
if (mkdir(hdn, S_IRUSR | S_IWUSR | S_IXUSR)) |
| 354 |
error("imapfilter: could not create directory %s; %s\n", hdn, |
| 355 |
strerror(errno)); |
| 356 |
|
| 357 |
return 0; |
| 358 |
} |
| 359 |
|
| 360 |
|
| 361 |
/* |
| 362 |
* Check if a file exists. |
| 363 |
*/ |
| 364 |
int exists_file(char *fname) |
| 365 |
{ |
| 366 |
struct stat fs; |
| 367 |
|
| 368 |
if (access(fname, F_OK)) |
| 369 |
return 0; |
| 370 |
|
| 371 |
stat(fname, &fs); |
| 372 |
if (!S_ISREG(fs.st_mode)) { |
| 373 |
error("imapfilter: file %s not a regular file\n", fname); |
| 374 |
return ERROR_FILE_OPEN; |
| 375 |
} |
| 376 |
return 1; |
| 377 |
} |
| 378 |
|
| 379 |
|
| 380 |
/* |
| 381 |
* Check if a directory exists. |
| 382 |
*/ |
| 383 |
int exists_dir(char *dname) |
| 384 |
{ |
| 385 |
struct stat ds; |
| 386 |
|
| 387 |
if (access(dname, F_OK)) |
| 388 |
return 0; |
| 389 |
|
| 390 |
stat(dname, &ds); |
| 391 |
if (!S_ISDIR(ds.st_mode)) { |
| 392 |
error("imapfilter: file %s not a directory\n", dname); |
| 393 |
return ERROR_FILE_OPEN; |
| 394 |
} |
| 395 |
return 1; |
| 396 |
} |
| 397 |
|
| 398 |
|
| 399 |
/* |
| 400 |
* Create a file with the specified permissions. |
| 401 |
*/ |
| 402 |
int create_file(char *fname, mode_t mode) |
| 403 |
{ |
| 404 |
int fd = 0; |
| 405 |
|
| 406 |
if (!exists_file(fname)) { |
| 407 |
fd = open(fname, O_CREAT | O_WRONLY | O_TRUNC, mode); |
| 408 |
if (fd == -1) { |
| 409 |
error("imapfilter: could not create file %s; %s\n", fname, |
| 410 |
strerror(errno)); |
| 411 |
return ERROR_FILE_OPEN; |
| 412 |
} |
| 413 |
close(fd); |
| 414 |
} |
| 415 |
return 0; |
| 416 |
} |
| 417 |
|
| 418 |
|
| 419 |
#ifdef CHECK_PERMISSIONS |
| 420 |
/* |
| 421 |
* Check the permissions of a file. |
| 422 |
*/ |
| 423 |
int check_file_perms(char *fname, mode_t mode) |
| 424 |
{ |
| 425 |
struct stat fs; |
| 426 |
|
| 427 |
if (stat(fname, &fs)) { |
| 428 |
error("imapfilter: getting file %s status; %s\n", fname, |
| 429 |
strerror(errno)); |
| 430 |
return ERROR_TRIVIAL; |
| 431 |
} |
| 432 |
if (!S_ISREG(fs.st_mode)) { |
| 433 |
error("imapfilter: file %s not a regular file\n", fname); |
| 434 |
return ERROR_TRIVIAL; |
| 435 |
} |
| 436 |
if ((fs.st_mode & 00777) != mode) { |
| 437 |
error("imapfilter: warning: improper file %s permissions\n" |
| 438 |
"imapfilter: warning: file's mode should be %o not %o\n", |
| 439 |
fname, mode, fs.st_mode & 00777); |
| 440 |
return ERROR_TRIVIAL; |
| 441 |
} |
| 442 |
return 0; |
| 443 |
} |
| 444 |
|
| 445 |
|
| 446 |
/* |
| 447 |
* Check the permissions of a directory. |
| 448 |
*/ |
| 449 |
int check_dir_perms(char *dname, mode_t mode) |
| 450 |
{ |
| 451 |
struct stat ds; |
| 452 |
|
| 453 |
if (stat(dname, &ds)) { |
| 454 |
error("imapfilter: getting file %s status; %s\n", dname, |
| 455 |
strerror(errno)); |
| 456 |
return ERROR_TRIVIAL; |
| 457 |
} |
| 458 |
if (!S_ISDIR(ds.st_mode)) { |
| 459 |
error("imapfilter: file %s not a directory\n", dname); |
| 460 |
return ERROR_TRIVIAL; |
| 461 |
} |
| 462 |
if ((ds.st_mode & 00777) != mode) { |
| 463 |
error("imapfilter: warning: improper dir %s permissions\n" |
| 464 |
"imapfilter: warning: file's mode should be %o not %o\n", |
| 465 |
dname, mode, ds.st_mode & 00777); |
| 466 |
return ERROR_TRIVIAL; |
| 467 |
} |
| 468 |
return 0; |
| 469 |
} |
| 470 |
|
| 471 |
#endif |
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