1 /*- 2 * Copyright (c) 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if 0 31 #ifndef lint 32 static const char copyright[] = 33 "@(#) Copyright (c) 1991, 1993, 1994\n\ 34 The Regents of the University of California. All rights reserved.\n"; 35 #endif /* not lint */ 36 37 #ifndef lint 38 static char sccsid[] = "@(#)pwd_mkdb.c 8.5 (Berkeley) 4/20/94"; 39 #endif /* not lint */ 40 #endif 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <sys/param.h> 46 #include <sys/endian.h> 47 #include <sys/stat.h> 48 #include <arpa/inet.h> 49 50 #include <db.h> 51 #include <err.h> 52 #include <errno.h> 53 #include <fcntl.h> 54 #include <libgen.h> 55 #include <limits.h> 56 #include <pwd.h> 57 #include <signal.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <unistd.h> 62 63 #include "pw_scan.h" 64 65 #define INSECURE 1 66 #define SECURE 2 67 #define PERM_INSECURE (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) 68 #define PERM_SECURE (S_IRUSR|S_IWUSR) 69 #define LEGACY_VERSION(x) _PW_VERSIONED(x, 3) 70 #define CURRENT_VERSION(x) _PW_VERSIONED(x, 4) 71 72 static HASHINFO openinfo = { 73 4096, /* bsize */ 74 32, /* ffactor */ 75 256, /* nelem */ 76 2048 * 1024, /* cachesize */ 77 NULL, /* hash() */ 78 BYTE_ORDER /* lorder */ 79 }; 80 81 static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean; 82 static struct passwd pwd; /* password structure */ 83 static char *pname; /* password file name */ 84 static char prefix[MAXPATHLEN]; 85 86 static int is_comment; /* flag for comments */ 87 static char line[LINE_MAX]; 88 89 void cleanup(void); 90 void error(const char *); 91 void cp(char *, char *, mode_t mode); 92 void mv(char *, char *); 93 int scan(FILE *, struct passwd *); 94 static void usage(void); 95 96 int 97 main(int argc, char *argv[]) 98 { 99 static char verskey[] = _PWD_VERSION_KEY; 100 char version = _PWD_CURRENT_VERSION; 101 DB *dp, *sdp, *pw_db; 102 DBT data, sdata, key; 103 FILE *fp, *oldfp; 104 sigset_t set; 105 int ch, cnt, ypcnt, makeold, tfd, yp_enabled = 0; 106 unsigned int len; 107 uint32_t store; 108 const char *t; 109 char *p; 110 char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024]; 111 char sbuf[MAX(MAXPATHLEN, LINE_MAX * 2)]; 112 char buf2[MAXPATHLEN]; 113 char sbuf2[MAXPATHLEN]; 114 char *username; 115 u_int method, methoduid; 116 int Cflag, dflag, iflag, lflag; 117 int nblock = 0; 118 119 iflag = dflag = Cflag = lflag = 0; 120 strcpy(prefix, _PATH_PWD); 121 makeold = 0; 122 username = NULL; 123 oldfp = NULL; 124 while ((ch = getopt(argc, argv, "BCLlNd:ips:u:v")) != -1) 125 switch(ch) { 126 case 'B': /* big-endian output */ 127 openinfo.lorder = BIG_ENDIAN; 128 break; 129 case 'C': /* verify only */ 130 Cflag = 1; 131 break; 132 case 'l': /* generate legacy entries */ 133 lflag = 1; 134 break; 135 case 'L': /* little-endian output */ 136 openinfo.lorder = LITTLE_ENDIAN; 137 break; 138 case 'N': /* do not wait for lock */ 139 nblock = LOCK_NB; /* will fail if locked */ 140 break; 141 case 'd': 142 dflag++; 143 strlcpy(prefix, optarg, sizeof(prefix)); 144 break; 145 case 'i': 146 iflag++; 147 break; 148 case 'p': /* create V7 "file.orig" */ 149 makeold = 1; 150 break; 151 case 's': /* change default cachesize */ 152 openinfo.cachesize = atoi(optarg) * 1024 * 1024; 153 break; 154 case 'u': /* only update this record */ 155 username = optarg; 156 break; 157 case 'v': /* backward compatible */ 158 break; 159 default: 160 usage(); 161 } 162 argc -= optind; 163 argv += optind; 164 165 if (argc != 1 || (username && (*username == '+' || *username == '-'))) 166 usage(); 167 168 /* 169 * This could be changed to allow the user to interrupt. 170 * Probably not worth the effort. 171 */ 172 sigemptyset(&set); 173 sigaddset(&set, SIGTSTP); 174 sigaddset(&set, SIGHUP); 175 sigaddset(&set, SIGINT); 176 sigaddset(&set, SIGQUIT); 177 sigaddset(&set, SIGTERM); 178 (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL); 179 180 /* We don't care what the user wants. */ 181 (void)umask(0); 182 183 pname = *argv; 184 185 /* 186 * Open and lock the original password file. We have to check 187 * the hardlink count after we get the lock to handle any potential 188 * unlink/rename race. 189 * 190 * This lock is necessary when someone runs pwd_mkdb manually, directly 191 * on master.passwd, to handle the case where a user might try to 192 * change his password while pwd_mkdb is running. 193 */ 194 for (;;) { 195 struct stat st; 196 197 if (!(fp = fopen(pname, "r"))) 198 error(pname); 199 if (flock(fileno(fp), LOCK_EX|nblock) < 0 && !(dflag && iflag)) 200 error("flock"); 201 if (fstat(fileno(fp), &st) < 0) 202 error(pname); 203 if (st.st_nlink != 0) 204 break; 205 fclose(fp); 206 fp = NULL; 207 } 208 209 /* check only if password database is valid */ 210 if (Cflag) { 211 while (scan(fp, &pwd)) 212 if (!is_comment && strlen(pwd.pw_name) >= MAXLOGNAME) { 213 warnx("%s: username too long", pwd.pw_name); 214 exit(1); 215 } 216 exit(0); 217 } 218 219 /* Open the temporary insecure password database. */ 220 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 221 (void)snprintf(sbuf, sizeof(sbuf), "%s/%s.tmp", prefix, _SMP_DB); 222 if (username) { 223 int use_version; 224 225 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 226 (void)snprintf(sbuf2, sizeof(sbuf2), "%s/%s", prefix, _SMP_DB); 227 228 clean = FILE_INSECURE; 229 cp(buf2, buf, PERM_INSECURE); 230 dp = dbopen(buf, 231 O_RDWR|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 232 if (dp == NULL) 233 error(buf); 234 235 clean = FILE_SECURE; 236 cp(sbuf2, sbuf, PERM_SECURE); 237 sdp = dbopen(sbuf, 238 O_RDWR|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 239 if (sdp == NULL) 240 error(sbuf); 241 242 /* 243 * Do some trouble to check if we should store this users 244 * uid. Don't use getpwnam/getpwuid as that interferes 245 * with NIS. 246 */ 247 pw_db = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL); 248 if (!pw_db) 249 error(_MP_DB); 250 251 key.data = verskey; 252 key.size = sizeof(verskey)-1; 253 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) 254 use_version = *(unsigned char *)data.data; 255 else 256 use_version = 3; 257 buf[0] = _PW_VERSIONED(_PW_KEYBYNAME, use_version); 258 len = strlen(username); 259 260 /* Only check that username fits in buffer */ 261 memmove(buf + 1, username, MIN(len, sizeof(buf) - 1)); 262 key.data = (u_char *)buf; 263 key.size = len + 1; 264 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) { 265 p = (char *)data.data; 266 267 /* jump over pw_name and pw_passwd, to get to pw_uid */ 268 while (*p++) 269 ; 270 while (*p++) 271 ; 272 273 buf[0] = _PW_VERSIONED(_PW_KEYBYUID, use_version); 274 memmove(buf + 1, p, sizeof(store)); 275 key.data = (u_char *)buf; 276 key.size = sizeof(store) + 1; 277 278 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) { 279 /* First field of data.data holds pw_pwname */ 280 if (!strcmp(data.data, username)) 281 methoduid = 0; 282 else 283 methoduid = R_NOOVERWRITE; 284 } else { 285 methoduid = R_NOOVERWRITE; 286 } 287 } else { 288 methoduid = R_NOOVERWRITE; 289 } 290 if ((pw_db->close)(pw_db)) 291 error("close pw_db"); 292 method = 0; 293 } else { 294 dp = dbopen(buf, 295 O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 296 if (dp == NULL) 297 error(buf); 298 clean = FILE_INSECURE; 299 300 sdp = dbopen(sbuf, 301 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 302 if (sdp == NULL) 303 error(sbuf); 304 clean = FILE_SECURE; 305 306 method = R_NOOVERWRITE; 307 methoduid = R_NOOVERWRITE; 308 } 309 310 /* 311 * Open file for old password file. Minor trickiness -- don't want to 312 * chance the file already existing, since someone (stupidly) might 313 * still be using this for permission checking. So, open it first and 314 * fdopen the resulting fd. The resulting file should be readable by 315 * everyone. 316 */ 317 if (makeold) { 318 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 319 if ((tfd = open(buf, 320 O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0) 321 error(buf); 322 if ((oldfp = fdopen(tfd, "w")) == NULL) 323 error(buf); 324 clean = FILE_ORIG; 325 } 326 327 /* 328 * The databases actually contain three copies of the original data. 329 * Each password file entry is converted into a rough approximation 330 * of a ``struct passwd'', with the strings placed inline. This 331 * object is then stored as the data for three separate keys. The 332 * first key * is the pw_name field prepended by the _PW_KEYBYNAME 333 * character. The second key is the pw_uid field prepended by the 334 * _PW_KEYBYUID character. The third key is the line number in the 335 * original file prepended by the _PW_KEYBYNUM character. (The special 336 * characters are prepended to ensure that the keys do not collide.) 337 */ 338 /* In order to transition this file into a machine-independent 339 * form, we have to change the format of entries. However, since 340 * older binaries will still expect the old MD format entries, we 341 * create those as usual and use versioned tags for the new entries. 342 */ 343 if (username == NULL) { 344 /* Do not add the VERSION tag when updating a single 345 * user. When operating on `old format' databases, this 346 * would result in applications `seeing' only the updated 347 * entries. 348 */ 349 key.data = verskey; 350 key.size = sizeof(verskey)-1; 351 data.data = &version; 352 data.size = 1; 353 if ((dp->put)(dp, &key, &data, 0) == -1) 354 error("put"); 355 if ((sdp->put)(sdp, &key, &data, 0) == -1) 356 error("put"); 357 } 358 ypcnt = 0; 359 data.data = (u_char *)buf; 360 sdata.data = (u_char *)sbuf; 361 key.data = (u_char *)tbuf; 362 for (cnt = 1; scan(fp, &pwd); ++cnt) { 363 if (!is_comment && 364 (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-')) { 365 yp_enabled = 1; 366 ypcnt++; 367 } 368 if (is_comment) 369 --cnt; 370 #define COMPACT(e) t = e; while ((*p++ = *t++)); 371 #define SCALAR(e) store = htonl((uint32_t)(e)); \ 372 memmove(p, &store, sizeof(store)); \ 373 p += sizeof(store); 374 #define LSCALAR(e) store = HTOL((uint32_t)(e)); \ 375 memmove(p, &store, sizeof(store)); \ 376 p += sizeof(store); 377 #define HTOL(e) (openinfo.lorder == BYTE_ORDER ? \ 378 (uint32_t)(e) : \ 379 bswap32((uint32_t)(e))) 380 if (!is_comment && 381 (!username || (strcmp(username, pwd.pw_name) == 0))) { 382 /* Create insecure data. */ 383 p = buf; 384 COMPACT(pwd.pw_name); 385 COMPACT("*"); 386 SCALAR(pwd.pw_uid); 387 SCALAR(pwd.pw_gid); 388 SCALAR(pwd.pw_change); 389 COMPACT(pwd.pw_class); 390 COMPACT(pwd.pw_gecos); 391 COMPACT(pwd.pw_dir); 392 COMPACT(pwd.pw_shell); 393 SCALAR(pwd.pw_expire); 394 SCALAR(pwd.pw_fields); 395 data.size = p - buf; 396 397 /* Create secure data. */ 398 p = sbuf; 399 COMPACT(pwd.pw_name); 400 COMPACT(pwd.pw_passwd); 401 SCALAR(pwd.pw_uid); 402 SCALAR(pwd.pw_gid); 403 SCALAR(pwd.pw_change); 404 COMPACT(pwd.pw_class); 405 COMPACT(pwd.pw_gecos); 406 COMPACT(pwd.pw_dir); 407 COMPACT(pwd.pw_shell); 408 SCALAR(pwd.pw_expire); 409 SCALAR(pwd.pw_fields); 410 sdata.size = p - sbuf; 411 412 /* Store insecure by name. */ 413 tbuf[0] = CURRENT_VERSION(_PW_KEYBYNAME); 414 len = strlen(pwd.pw_name); 415 memmove(tbuf + 1, pwd.pw_name, len); 416 key.size = len + 1; 417 if ((dp->put)(dp, &key, &data, method) == -1) 418 error("put"); 419 420 /* Store insecure by number. */ 421 tbuf[0] = CURRENT_VERSION(_PW_KEYBYNUM); 422 store = htonl(cnt); 423 memmove(tbuf + 1, &store, sizeof(store)); 424 key.size = sizeof(store) + 1; 425 if ((dp->put)(dp, &key, &data, method) == -1) 426 error("put"); 427 428 /* Store insecure by uid. */ 429 tbuf[0] = CURRENT_VERSION(_PW_KEYBYUID); 430 store = htonl(pwd.pw_uid); 431 memmove(tbuf + 1, &store, sizeof(store)); 432 key.size = sizeof(store) + 1; 433 if ((dp->put)(dp, &key, &data, methoduid) == -1) 434 error("put"); 435 436 /* Store secure by name. */ 437 tbuf[0] = CURRENT_VERSION(_PW_KEYBYNAME); 438 len = strlen(pwd.pw_name); 439 memmove(tbuf + 1, pwd.pw_name, len); 440 key.size = len + 1; 441 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 442 error("put"); 443 444 /* Store secure by number. */ 445 tbuf[0] = CURRENT_VERSION(_PW_KEYBYNUM); 446 store = htonl(cnt); 447 memmove(tbuf + 1, &store, sizeof(store)); 448 key.size = sizeof(store) + 1; 449 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 450 error("put"); 451 452 /* Store secure by uid. */ 453 tbuf[0] = CURRENT_VERSION(_PW_KEYBYUID); 454 store = htonl(pwd.pw_uid); 455 memmove(tbuf + 1, &store, sizeof(store)); 456 key.size = sizeof(store) + 1; 457 if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1) 458 error("put"); 459 460 /* Store insecure and secure special plus and special minus */ 461 if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') { 462 tbuf[0] = CURRENT_VERSION(_PW_KEYYPBYNUM); 463 store = htonl(ypcnt); 464 memmove(tbuf + 1, &store, sizeof(store)); 465 key.size = sizeof(store) + 1; 466 if ((dp->put)(dp, &key, &data, method) == -1) 467 error("put"); 468 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 469 error("put"); 470 } 471 472 if (lflag) { 473 /* Create insecure data. (legacy version) */ 474 p = buf; 475 COMPACT(pwd.pw_name); 476 COMPACT("*"); 477 LSCALAR(pwd.pw_uid); 478 LSCALAR(pwd.pw_gid); 479 LSCALAR(pwd.pw_change); 480 COMPACT(pwd.pw_class); 481 COMPACT(pwd.pw_gecos); 482 COMPACT(pwd.pw_dir); 483 COMPACT(pwd.pw_shell); 484 LSCALAR(pwd.pw_expire); 485 LSCALAR(pwd.pw_fields); 486 data.size = p - buf; 487 488 /* Create secure data. (legacy version) */ 489 p = sbuf; 490 COMPACT(pwd.pw_name); 491 COMPACT(pwd.pw_passwd); 492 LSCALAR(pwd.pw_uid); 493 LSCALAR(pwd.pw_gid); 494 LSCALAR(pwd.pw_change); 495 COMPACT(pwd.pw_class); 496 COMPACT(pwd.pw_gecos); 497 COMPACT(pwd.pw_dir); 498 COMPACT(pwd.pw_shell); 499 LSCALAR(pwd.pw_expire); 500 LSCALAR(pwd.pw_fields); 501 sdata.size = p - sbuf; 502 503 /* Store insecure by name. */ 504 tbuf[0] = LEGACY_VERSION(_PW_KEYBYNAME); 505 len = strlen(pwd.pw_name); 506 memmove(tbuf + 1, pwd.pw_name, len); 507 key.size = len + 1; 508 if ((dp->put)(dp, &key, &data, method) == -1) 509 error("put"); 510 511 /* Store insecure by number. */ 512 tbuf[0] = LEGACY_VERSION(_PW_KEYBYNUM); 513 store = HTOL(cnt); 514 memmove(tbuf + 1, &store, sizeof(store)); 515 key.size = sizeof(store) + 1; 516 if ((dp->put)(dp, &key, &data, method) == -1) 517 error("put"); 518 519 /* Store insecure by uid. */ 520 tbuf[0] = LEGACY_VERSION(_PW_KEYBYUID); 521 store = HTOL(pwd.pw_uid); 522 memmove(tbuf + 1, &store, sizeof(store)); 523 key.size = sizeof(store) + 1; 524 if ((dp->put)(dp, &key, &data, methoduid) == -1) 525 error("put"); 526 527 /* Store secure by name. */ 528 tbuf[0] = LEGACY_VERSION(_PW_KEYBYNAME); 529 len = strlen(pwd.pw_name); 530 memmove(tbuf + 1, pwd.pw_name, len); 531 key.size = len + 1; 532 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 533 error("put"); 534 535 /* Store secure by number. */ 536 tbuf[0] = LEGACY_VERSION(_PW_KEYBYNUM); 537 store = HTOL(cnt); 538 memmove(tbuf + 1, &store, sizeof(store)); 539 key.size = sizeof(store) + 1; 540 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 541 error("put"); 542 543 /* Store secure by uid. */ 544 tbuf[0] = LEGACY_VERSION(_PW_KEYBYUID); 545 store = HTOL(pwd.pw_uid); 546 memmove(tbuf + 1, &store, sizeof(store)); 547 key.size = sizeof(store) + 1; 548 if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1) 549 error("put"); 550 551 /* Store insecure and secure special plus and special minus */ 552 if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') { 553 tbuf[0] = LEGACY_VERSION(_PW_KEYYPBYNUM); 554 store = HTOL(ypcnt); 555 memmove(tbuf + 1, &store, sizeof(store)); 556 key.size = sizeof(store) + 1; 557 if ((dp->put)(dp, &key, &data, method) == -1) 558 error("put"); 559 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 560 error("put"); 561 } 562 } 563 } 564 /* Create original format password file entry */ 565 if (is_comment && makeold){ /* copy comments */ 566 if (fprintf(oldfp, "%s\n", line) < 0) 567 error("write old"); 568 } else if (makeold) { 569 char uidstr[20]; 570 char gidstr[20]; 571 572 snprintf(uidstr, sizeof(uidstr), "%u", pwd.pw_uid); 573 snprintf(gidstr, sizeof(gidstr), "%u", pwd.pw_gid); 574 575 if (fprintf(oldfp, "%s:*:%s:%s:%s:%s:%s\n", 576 pwd.pw_name, pwd.pw_fields & _PWF_UID ? uidstr : "", 577 pwd.pw_fields & _PWF_GID ? gidstr : "", 578 pwd.pw_gecos, pwd.pw_dir, pwd.pw_shell) < 0) 579 error("write old"); 580 } 581 } 582 /* If YP enabled, set flag. */ 583 if (yp_enabled) { 584 buf[0] = yp_enabled + 2; 585 data.size = 1; 586 key.size = 1; 587 tbuf[0] = CURRENT_VERSION(_PW_KEYYPENABLED); 588 if ((dp->put)(dp, &key, &data, method) == -1) 589 error("put"); 590 if ((sdp->put)(sdp, &key, &data, method) == -1) 591 error("put"); 592 if (lflag) { 593 tbuf[0] = LEGACY_VERSION(_PW_KEYYPENABLED); 594 key.size = 1; 595 if ((dp->put)(dp, &key, &data, method) == -1) 596 error("put"); 597 if ((sdp->put)(sdp, &key, &data, method) == -1) 598 error("put"); 599 } 600 } 601 602 if ((dp->close)(dp) == -1) 603 error("close"); 604 if ((sdp->close)(sdp) == -1) 605 error("close"); 606 if (makeold) { 607 (void)fflush(oldfp); 608 if (fclose(oldfp) == EOF) 609 error("close old"); 610 } 611 612 /* Set master.passwd permissions, in case caller forgot. */ 613 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 614 615 /* Install as the real password files. */ 616 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 617 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 618 mv(buf, buf2); 619 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 620 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB); 621 mv(buf, buf2); 622 if (makeold) { 623 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD); 624 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 625 mv(buf, buf2); 626 } 627 /* 628 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 629 * all use flock(2) on it to block other incarnations of themselves. 630 * The rename means that everything is unlocked, as the original file 631 * can no longer be accessed. 632 */ 633 (void)snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD); 634 mv(pname, buf); 635 636 /* 637 * Close locked password file after rename() 638 */ 639 if (fclose(fp) == EOF) 640 error("close fp"); 641 642 exit(0); 643 } 644 645 int 646 scan(FILE *fp, struct passwd *pw) 647 { 648 static int lcnt; 649 size_t len; 650 char *p; 651 652 p = fgetln(fp, &len); 653 if (p == NULL) 654 return (0); 655 ++lcnt; 656 /* 657 * ``... if I swallow anything evil, put your fingers down my 658 * throat...'' 659 * -- The Who 660 */ 661 if (len > 0 && p[len - 1] == '\n') 662 len--; 663 if (len >= sizeof(line) - 1) { 664 warnx("line #%d too long", lcnt); 665 goto fmt; 666 } 667 memcpy(line, p, len); 668 line[len] = '\0'; 669 670 /* 671 * Ignore comments: ^[ \t]*# 672 */ 673 for (p = line; *p != '\0'; p++) 674 if (*p != ' ' && *p != '\t') 675 break; 676 if (*p == '#' || *p == '\0') { 677 is_comment = 1; 678 return(1); 679 } else 680 is_comment = 0; 681 682 if (!__pw_scan(line, pw, _PWSCAN_WARN|_PWSCAN_MASTER)) { 683 warnx("at line #%d", lcnt); 684 fmt: errno = EFTYPE; /* XXX */ 685 error(pname); 686 } 687 688 return (1); 689 } 690 691 void 692 cp(char *from, char *to, mode_t mode) 693 { 694 static char buf[MAXBSIZE]; 695 int from_fd, rcount, to_fd, wcount; 696 697 if ((from_fd = open(from, O_RDONLY, 0)) < 0) 698 error(from); 699 if ((to_fd = open(to, O_WRONLY|O_CREAT|O_EXCL, mode)) < 0) 700 error(to); 701 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 702 wcount = write(to_fd, buf, rcount); 703 if (rcount != wcount || wcount == -1) { 704 int sverrno = errno; 705 706 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 707 errno = sverrno; 708 error(buf); 709 } 710 } 711 if (rcount < 0) { 712 int sverrno = errno; 713 714 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 715 errno = sverrno; 716 error(buf); 717 } 718 } 719 720 721 void 722 mv(char *from, char *to) 723 { 724 char buf[MAXPATHLEN]; 725 char *to_dir; 726 int to_dir_fd = -1; 727 728 /* 729 * Make sure file is safe on disk. To improve performance we will call 730 * fsync() to the directory where file lies 731 */ 732 if (rename(from, to) != 0 || 733 (to_dir = dirname(to)) == NULL || 734 (to_dir_fd = open(to_dir, O_RDONLY|O_DIRECTORY)) == -1 || 735 fsync(to_dir_fd) != 0) { 736 int sverrno = errno; 737 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 738 errno = sverrno; 739 if (to_dir_fd != -1) 740 close(to_dir_fd); 741 error(buf); 742 } 743 744 if (to_dir_fd != -1) 745 close(to_dir_fd); 746 } 747 748 void 749 error(const char *name) 750 { 751 752 warn("%s", name); 753 cleanup(); 754 exit(1); 755 } 756 757 void 758 cleanup(void) 759 { 760 char buf[MAXPATHLEN]; 761 762 switch(clean) { 763 case FILE_ORIG: 764 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 765 (void)unlink(buf); 766 /* FALLTHROUGH */ 767 case FILE_SECURE: 768 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 769 (void)unlink(buf); 770 /* FALLTHROUGH */ 771 case FILE_INSECURE: 772 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 773 (void)unlink(buf); 774 } 775 } 776 777 static void 778 usage(void) 779 { 780 781 (void)fprintf(stderr, 782 "usage: pwd_mkdb [-BCiLNp] [-d directory] [-s cachesize] [-u username] file\n"); 783 exit(1); 784 } 785