1 /* $OpenBSD: makemap.c,v 1.77 2024/05/07 12:10:06 op Exp $ */ 2 3 /* 4 * Copyright (c) 2008 Gilles Chehade <gilles@poolp.org> 5 * Copyright (c) 2008-2009 Jacek Masiulaniec <jacekm@dobremiasto.net> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/stat.h> 21 22 #include <ctype.h> 23 #include <db.h> 24 #include <err.h> 25 #include <errno.h> 26 #include <fcntl.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <syslog.h> 30 #include <unistd.h> 31 #include <util.h> 32 33 #include "smtpd.h" 34 #include "log.h" 35 36 #define PATH_ALIASES "/etc/mail/aliases" 37 38 static void usage(void); 39 static int parse_map(DB *, int *, char *); 40 static int add_mapentry(DB *, int *, char *, char *, size_t); 41 static int add_setentry(DB *, int *, char *, size_t); 42 static int make_plain(DBT *, char *); 43 static int make_aliases(DBT *, char *); 44 static char *conf_aliases(char *); 45 static int dump_db(const char *, DBTYPE); 46 47 char *source; 48 static int mode; 49 50 enum output_type { 51 T_PLAIN, 52 T_ALIASES, 53 T_SET 54 } type; 55 56 /* 57 * Stub functions so that makemap compiles using minimum object files. 58 */ 59 int 60 fork_proc_backend(const char *backend, const char *conf, const char *procname, 61 int do_stdout) 62 { 63 return (-1); 64 } 65 66 int 67 makemap(int prog_mode, int argc, char *argv[]) 68 { 69 struct stat sb; 70 char dbname[PATH_MAX]; 71 DB *db; 72 const char *opts; 73 char *conf, *oflag = NULL; 74 int ch, dbputs = 0, Uflag = 0; 75 DBTYPE dbtype = DB_HASH; 76 char *p; 77 gid_t gid; 78 int fd = -1; 79 80 gid = getgid(); 81 if (setresgid(gid, gid, gid) == -1) 82 err(1, "setresgid"); 83 84 if ((env = config_default()) == NULL) 85 err(1, NULL); 86 87 log_init(1, LOG_MAIL); 88 89 mode = prog_mode; 90 conf = CONF_FILE; 91 type = T_PLAIN; 92 opts = "b:C:d:ho:O:t:U"; 93 if (mode == P_NEWALIASES) 94 opts = "f:h"; 95 96 while ((ch = getopt(argc, argv, opts)) != -1) { 97 switch (ch) { 98 case 'b': 99 if (optarg && strcmp(optarg, "i") == 0) 100 mode = P_NEWALIASES; 101 break; 102 case 'C': 103 break; /* for compatibility */ 104 case 'd': 105 if (strcmp(optarg, "hash") == 0) 106 dbtype = DB_HASH; 107 else if (strcmp(optarg, "btree") == 0) 108 dbtype = DB_BTREE; 109 else 110 errx(1, "unsupported DB type '%s'", optarg); 111 break; 112 case 'f': 113 conf = optarg; 114 break; 115 case 'o': 116 oflag = optarg; 117 break; 118 case 'O': 119 if (strncmp(optarg, "AliasFile=", 10) != 0) 120 break; 121 type = T_ALIASES; 122 p = strchr(optarg, '='); 123 source = ++p; 124 break; 125 case 't': 126 if (strcmp(optarg, "aliases") == 0) 127 type = T_ALIASES; 128 else if (strcmp(optarg, "set") == 0) 129 type = T_SET; 130 else 131 errx(1, "unsupported type '%s'", optarg); 132 break; 133 case 'U': 134 Uflag = 1; 135 break; 136 default: 137 usage(); 138 } 139 } 140 argc -= optind; 141 argv += optind; 142 143 /* sendmail-compat makemap ... re-execute using proper interface */ 144 if (argc == 2) { 145 if (oflag) 146 usage(); 147 148 p = strstr(argv[1], ".db"); 149 if (p == NULL || strcmp(p, ".db") != 0) { 150 if (!bsnprintf(dbname, sizeof dbname, "%s.db", 151 argv[1])) 152 errx(1, "database name too long"); 153 } 154 else { 155 if (strlcpy(dbname, argv[1], sizeof dbname) 156 >= sizeof dbname) 157 errx(1, "database name too long"); 158 } 159 160 execl(PATH_MAKEMAP, "makemap", "-d", argv[0], "-o", dbname, 161 "-", (char *)NULL); 162 err(1, "execl"); 163 } 164 165 if (mode == P_NEWALIASES) { 166 if (geteuid()) 167 errx(1, "need root privileges"); 168 if (argc != 0) 169 usage(); 170 type = T_ALIASES; 171 if (source == NULL) 172 source = conf_aliases(conf); 173 } else { 174 if (argc != 1) 175 usage(); 176 source = argv[0]; 177 } 178 179 if (Uflag) 180 return dump_db(source, dbtype); 181 182 if (oflag == NULL && asprintf(&oflag, "%s.db", source) == -1) 183 err(1, "asprintf"); 184 185 if (strcmp(source, "-") != 0) 186 if (stat(source, &sb) == -1) 187 err(1, "stat: %s", source); 188 189 if (!bsnprintf(dbname, sizeof(dbname), "%s.XXXXXXXXXXX", oflag)) 190 errx(1, "path too long"); 191 if ((fd = mkstemp(dbname)) == -1) 192 err(1, "mkstemp"); 193 194 db = dbopen(dbname, O_TRUNC|O_RDWR, 0644, dbtype, NULL); 195 if (db == NULL) { 196 warn("dbopen: %s", dbname); 197 goto bad; 198 } 199 200 if (strcmp(source, "-") != 0) 201 if (fchmod(db->fd(db), sb.st_mode) == -1 || 202 fchown(db->fd(db), sb.st_uid, sb.st_gid) == -1) { 203 warn("couldn't carry ownership and perms to %s", 204 dbname); 205 goto bad; 206 } 207 208 if (!parse_map(db, &dbputs, source)) 209 goto bad; 210 211 if (db->close(db) == -1) { 212 warn("dbclose: %s", dbname); 213 goto bad; 214 } 215 216 /* force to disk before renaming over an existing file */ 217 if (fsync(fd) == -1) { 218 warn("fsync: %s", dbname); 219 goto bad; 220 } 221 if (close(fd) == -1) { 222 fd = -1; 223 warn("close: %s", dbname); 224 goto bad; 225 } 226 fd = -1; 227 228 if (rename(dbname, oflag) == -1) { 229 warn("rename"); 230 goto bad; 231 } 232 233 if (mode == P_NEWALIASES) 234 printf("%s: %d aliases\n", source, dbputs); 235 else if (dbputs == 0) 236 warnx("warning: empty map created: %s", oflag); 237 238 return 0; 239 bad: 240 if (fd != -1) 241 close(fd); 242 unlink(dbname); 243 return 1; 244 } 245 246 static int 247 parse_map(DB *db, int *dbputs, char *filename) 248 { 249 FILE *fp; 250 char *key, *val, *line = NULL; 251 size_t linesize = 0; 252 size_t lineno = 0; 253 int malformed, table_type, r; 254 255 if (strcmp(filename, "-") == 0) 256 fp = fdopen(0, "r"); 257 else 258 fp = fopen(filename, "r"); 259 if (fp == NULL) { 260 warn("%s", filename); 261 return 0; 262 } 263 264 if (!isatty(fileno(fp)) && flock(fileno(fp), LOCK_SH|LOCK_NB) == -1) { 265 if (errno == EWOULDBLOCK) 266 warnx("%s is locked", filename); 267 else 268 warn("%s: flock", filename); 269 fclose(fp); 270 return 0; 271 } 272 273 table_type = (type == T_SET) ? T_LIST : T_HASH; 274 while (parse_table_line(fp, &line, &linesize, &table_type, 275 &key, &val, &malformed) != -1) { 276 lineno++; 277 if (malformed) { 278 warnx("%s:%zd: invalid entry", source, lineno); 279 free(line); 280 fclose(fp); 281 return 0; 282 } 283 if (key == NULL) 284 continue; 285 286 switch (type) { 287 case T_PLAIN: 288 case T_ALIASES: 289 r = add_mapentry(db, dbputs, key, val, lineno); 290 break; 291 case T_SET: 292 r = add_setentry(db, dbputs, key, lineno); 293 break; 294 } 295 296 if (!r) { 297 free(line); 298 fclose(fp); 299 return 0; 300 } 301 } 302 303 free(line); 304 fclose(fp); 305 return 1; 306 } 307 308 static int 309 add_mapentry(DB *db, int *dbputs, char *keyp, char *valp, size_t lineno) 310 { 311 DBT key; 312 DBT val; 313 314 /* Check for dups. */ 315 key.data = keyp; 316 key.size = strlen(keyp) + 1; 317 318 xlowercase(key.data, key.data, strlen(key.data) + 1); 319 if (db->get(db, &key, &val, 0) == 0) { 320 warnx("%s:%zd: duplicate entry for %s", source, lineno, keyp); 321 return 0; 322 } 323 324 if (type == T_PLAIN) { 325 if (!make_plain(&val, valp)) 326 goto bad; 327 } 328 else if (type == T_ALIASES) { 329 if (!make_aliases(&val, valp)) 330 goto bad; 331 } 332 333 if (db->put(db, &key, &val, 0) == -1) { 334 warn("dbput"); 335 return 0; 336 } 337 338 (*dbputs)++; 339 340 free(val.data); 341 342 return 1; 343 344 bad: 345 warnx("%s:%zd: invalid entry", source, lineno); 346 return 0; 347 } 348 349 static int 350 add_setentry(DB *db, int *dbputs, char *keyp, size_t lineno) 351 { 352 DBT key; 353 DBT val; 354 355 val.data = "<set>"; 356 val.size = strlen(val.data) + 1; 357 358 /* Check for dups. */ 359 key.data = keyp; 360 key.size = strlen(keyp) + 1; 361 xlowercase(key.data, key.data, strlen(key.data) + 1); 362 if (db->get(db, &key, &val, 0) == 0) { 363 warnx("%s:%zd: duplicate entry for %s", source, lineno, keyp); 364 return 0; 365 } 366 367 if (db->put(db, &key, &val, 0) == -1) { 368 warn("dbput"); 369 return 0; 370 } 371 372 (*dbputs)++; 373 374 return 1; 375 } 376 377 static int 378 make_plain(DBT *val, char *text) 379 { 380 val->data = xstrdup(text); 381 val->size = strlen(text) + 1; 382 383 return (val->size); 384 } 385 386 static int 387 make_aliases(DBT *val, char *text) 388 { 389 struct expandnode xn; 390 char *subrcpt; 391 char *origtext; 392 393 val->data = NULL; 394 val->size = 0; 395 396 origtext = xstrdup(text); 397 398 while ((subrcpt = strsep(&text, ",")) != NULL) { 399 /* subrcpt: strip initial and trailing whitespace. */ 400 subrcpt = strip(subrcpt); 401 if (*subrcpt == '\0') 402 goto error; 403 404 if (!text_to_expandnode(&xn, subrcpt)) 405 goto error; 406 } 407 408 val->data = origtext; 409 val->size = strlen(origtext) + 1; 410 return (val->size); 411 412 error: 413 free(origtext); 414 415 return 0; 416 } 417 418 static char * 419 conf_aliases(char *cfgpath) 420 { 421 struct table *table; 422 char *path; 423 char *p; 424 425 if (parse_config(env, cfgpath, 0)) 426 exit(1); 427 428 table = table_find(env, "aliases"); 429 if (table == NULL) 430 return (PATH_ALIASES); 431 432 path = xstrdup(table->t_config); 433 p = strstr(path, ".db"); 434 if (p == NULL || strcmp(p, ".db") != 0) { 435 return (path); 436 } 437 *p = '\0'; 438 return (path); 439 } 440 441 static int 442 dump_db(const char *dbname, DBTYPE dbtype) 443 { 444 DB *db; 445 DBT key, val; 446 char *keystr, *valstr; 447 int r; 448 449 db = dbopen(dbname, O_RDONLY, 0644, dbtype, NULL); 450 if (db == NULL) 451 err(1, "dbopen: %s", dbname); 452 453 for (r = db->seq(db, &key, &val, R_FIRST); r == 0; 454 r = db->seq(db, &key, &val, R_NEXT)) { 455 keystr = key.data; 456 valstr = val.data; 457 if (keystr[key.size - 1] == '\0') 458 key.size--; 459 if (valstr[val.size - 1] == '\0') 460 val.size--; 461 printf("%.*s\t%.*s\n", (int)key.size, keystr, 462 (int)val.size, valstr); 463 } 464 if (r == -1) 465 err(1, "db->seq: %s", dbname); 466 467 if (db->close(db) == -1) 468 err(1, "dbclose: %s", dbname); 469 470 return 0; 471 } 472 473 static void 474 usage(void) 475 { 476 if (mode == P_NEWALIASES) 477 fprintf(stderr, "usage: newaliases [-f file]\n"); 478 else 479 fprintf(stderr, "usage: makemap [-U] [-d dbtype] [-o dbfile] " 480 "[-t type] file\n"); 481 exit(1); 482 } 483