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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1991, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)pwd_mkdb.c 8.5 (Berkeley) 4/20/94 35 * $FreeBSD: src/usr.sbin/pwd_mkdb/pwd_mkdb.c,v 1.35 2000/03/09 18:11:16 paul Exp $ 36 * $DragonFly: src/usr.sbin/pwd_mkdb/pwd_mkdb.c,v 1.3 2003/11/03 19:31:41 eirikn Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/stat.h> 41 42 #include <db.h> 43 #include <err.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <limits.h> 47 #include <pwd.h> 48 #include <signal.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 #include "pw_scan.h" 55 56 #define INSECURE 1 57 #define SECURE 2 58 #define PERM_INSECURE (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) 59 #define PERM_SECURE (S_IRUSR|S_IWUSR) 60 61 HASHINFO openinfo = { 62 4096, /* bsize */ 63 32, /* ffactor */ 64 256, /* nelem */ 65 2048 * 1024, /* cachesize */ 66 NULL, /* hash() */ 67 0 /* lorder */ 68 }; 69 70 static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean; 71 static struct passwd pwd; /* password structure */ 72 static char *pname; /* password file name */ 73 static char prefix[MAXPATHLEN]; 74 75 static int is_comment; /* flag for comments */ 76 static char line[LINE_MAX]; 77 78 void cleanup(void); 79 void error(char *); 80 void cp(char *, char *, mode_t mode); 81 void mv(char *, char *); 82 int scan(FILE *, struct passwd *); 83 static void usage(void); 84 85 int 86 main(argc, argv) 87 int argc; 88 char *argv[]; 89 { 90 DB *dp, *sdp, *pw_db; 91 DBT data, sdata, key; 92 FILE *fp, *oldfp; 93 sigset_t set; 94 int ch, cnt, ypcnt, len, makeold, tfd, yp_enabled = 0; 95 char *p, *t; 96 char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024]; 97 char sbuf[MAX(MAXPATHLEN, LINE_MAX * 2)]; 98 char buf2[MAXPATHLEN]; 99 char sbuf2[MAXPATHLEN]; 100 char *username; 101 u_int method, methoduid; 102 int Cflag; 103 int nblock = 0; 104 105 Cflag = 0; 106 strcpy(prefix, _PATH_PWD); 107 makeold = 0; 108 username = NULL; 109 while ((ch = getopt(argc, argv, "Cd:ps:u:vN")) != -1) 110 switch(ch) { 111 case 'C': /* verify only */ 112 Cflag = 1; 113 break; 114 case 'd': 115 strncpy(prefix, optarg, sizeof prefix - 1); 116 break; 117 case 'p': /* create V7 "file.orig" */ 118 makeold = 1; 119 break; 120 case 's': /* change default cachesize */ 121 openinfo.cachesize = atoi(optarg) * 1024 * 1024; 122 break; 123 case 'u': /* only update this record */ 124 username = optarg; 125 break; 126 case 'v': /* backward compatible */ 127 break; 128 case 'N': /* do not wait for lock */ 129 nblock = LOCK_NB; 130 break; 131 default: 132 usage(); 133 } 134 argc -= optind; 135 argv += optind; 136 137 if (argc != 1 || (username && (*username == '+' || *username == '-'))) 138 usage(); 139 140 /* 141 * This could be changed to allow the user to interrupt. 142 * Probably not worth the effort. 143 */ 144 sigemptyset(&set); 145 sigaddset(&set, SIGTSTP); 146 sigaddset(&set, SIGHUP); 147 sigaddset(&set, SIGINT); 148 sigaddset(&set, SIGQUIT); 149 sigaddset(&set, SIGTERM); 150 (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL); 151 152 /* We don't care what the user wants. */ 153 (void)umask(0); 154 155 pname = *argv; 156 157 /* 158 * Open and lock the original password file. We have to check 159 * the hardlink count after we get the lock to handle any potential 160 * unlink/rename race. 161 * 162 * This lock is necessary when someone runs pwd_mkdb manually, directly 163 * on master.passwd, to handle the case where a user might try to 164 * change his password while pwd_mkdb is running. 165 */ 166 for (;;) { 167 struct stat st; 168 169 if (!(fp = fopen(pname, "r"))) 170 error(pname); 171 if (flock(fileno(fp), LOCK_EX|nblock) < 0) 172 error("flock"); 173 if (fstat(fileno(fp), &st) < 0) 174 error(pname); 175 if (st.st_nlink != 0) 176 break; 177 fclose(fp); 178 fp = NULL; 179 } 180 181 /* check only if password database is valid */ 182 if (Cflag) { 183 for (cnt = 1; scan(fp, &pwd); ++cnt); 184 exit(0); 185 } 186 187 /* Open the temporary insecure password database. */ 188 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 189 (void)snprintf(sbuf, sizeof(sbuf), "%s/%s.tmp", prefix, _SMP_DB); 190 if (username) { 191 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 192 (void)snprintf(sbuf2, sizeof(sbuf2), "%s/%s", prefix, _SMP_DB); 193 194 clean = FILE_INSECURE; 195 cp(buf2, buf, PERM_INSECURE); 196 dp = dbopen(buf, 197 O_RDWR|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 198 if (dp == NULL) 199 error(buf); 200 201 clean = FILE_SECURE; 202 cp(sbuf2, sbuf, PERM_SECURE); 203 sdp = dbopen(sbuf, 204 O_RDWR|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 205 if (sdp == NULL) 206 error(sbuf); 207 208 /* 209 * Do some trouble to check if we should store this users 210 * uid. Don't use getpwnam/getpwuid as that interferes 211 * with NIS. 212 */ 213 pw_db = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL); 214 if (!pw_db) 215 error(_MP_DB); 216 buf[0] = _PW_KEYBYNAME; 217 len = strlen(username); 218 219 /* Only check that username fits in buffer */ 220 memmove(buf + 1, username, MIN(len, sizeof(buf) - 1)); 221 key.data = (u_char *)buf; 222 key.size = len + 1; 223 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) { 224 p = (char *)data.data; 225 226 /* jump over pw_name and pw_passwd, to get to pw_uid */ 227 while (*p++) 228 ; 229 while (*p++) 230 ; 231 232 buf[0] = _PW_KEYBYUID; 233 memmove(buf + 1, p, sizeof(int)); 234 key.data = (u_char *)buf; 235 key.size = sizeof(int) + 1; 236 237 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) { 238 /* First field of data.data holds pw_pwname */ 239 if (!strcmp(data.data, username)) 240 methoduid = 0; 241 else 242 methoduid = R_NOOVERWRITE; 243 } else { 244 methoduid = R_NOOVERWRITE; 245 } 246 } else { 247 methoduid = R_NOOVERWRITE; 248 } 249 if ((pw_db->close)(pw_db)) 250 error("close pw_db"); 251 method = 0; 252 } else { 253 dp = dbopen(buf, 254 O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 255 if (dp == NULL) 256 error(buf); 257 clean = FILE_INSECURE; 258 259 sdp = dbopen(sbuf, 260 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 261 if (sdp == NULL) 262 error(sbuf); 263 clean = FILE_SECURE; 264 265 method = R_NOOVERWRITE; 266 methoduid = R_NOOVERWRITE; 267 } 268 269 /* 270 * Open file for old password file. Minor trickiness -- don't want to 271 * chance the file already existing, since someone (stupidly) might 272 * still be using this for permission checking. So, open it first and 273 * fdopen the resulting fd. The resulting file should be readable by 274 * everyone. 275 */ 276 if (makeold) { 277 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 278 if ((tfd = open(buf, 279 O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0) 280 error(buf); 281 if ((oldfp = fdopen(tfd, "w")) == NULL) 282 error(buf); 283 clean = FILE_ORIG; 284 } 285 286 /* 287 * The databases actually contain three copies of the original data. 288 * Each password file entry is converted into a rough approximation 289 * of a ``struct passwd'', with the strings placed inline. This 290 * object is then stored as the data for three separate keys. The 291 * first key * is the pw_name field prepended by the _PW_KEYBYNAME 292 * character. The second key is the pw_uid field prepended by the 293 * _PW_KEYBYUID character. The third key is the line number in the 294 * original file prepended by the _PW_KEYBYNUM character. (The special 295 * characters are prepended to ensure that the keys do not collide.) 296 */ 297 ypcnt = 1; 298 data.data = (u_char *)buf; 299 sdata.data = (u_char *)sbuf; 300 key.data = (u_char *)tbuf; 301 for (cnt = 1; scan(fp, &pwd); ++cnt) { 302 if (!is_comment && 303 (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-')) 304 yp_enabled = 1; 305 if (is_comment) 306 --cnt; 307 #define COMPACT(e) t = e; while ((*p++ = *t++)); 308 if (!is_comment && 309 (!username || (strcmp(username, pwd.pw_name) == 0))) { 310 /* Create insecure data. */ 311 p = buf; 312 COMPACT(pwd.pw_name); 313 COMPACT("*"); 314 memmove(p, &pwd.pw_uid, sizeof(pwd.pw_uid)); 315 p += sizeof(int); 316 memmove(p, &pwd.pw_gid, sizeof(pwd.pw_gid)); 317 p += sizeof(int); 318 memmove(p, &pwd.pw_change, sizeof(time_t)); 319 p += sizeof(time_t); 320 COMPACT(pwd.pw_class); 321 COMPACT(pwd.pw_gecos); 322 COMPACT(pwd.pw_dir); 323 COMPACT(pwd.pw_shell); 324 memmove(p, &pwd.pw_expire, sizeof(time_t)); 325 p += sizeof(time_t); 326 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 327 p += sizeof pwd.pw_fields; 328 data.size = p - buf; 329 330 /* Create secure data. */ 331 p = sbuf; 332 COMPACT(pwd.pw_name); 333 COMPACT(pwd.pw_passwd); 334 memmove(p, &pwd.pw_uid, sizeof(pwd.pw_uid)); 335 p += sizeof(int); 336 memmove(p, &pwd.pw_gid, sizeof(pwd.pw_gid)); 337 p += sizeof(int); 338 memmove(p, &pwd.pw_change, sizeof(time_t)); 339 p += sizeof(time_t); 340 COMPACT(pwd.pw_class); 341 COMPACT(pwd.pw_gecos); 342 COMPACT(pwd.pw_dir); 343 COMPACT(pwd.pw_shell); 344 memmove(p, &pwd.pw_expire, sizeof(time_t)); 345 p += sizeof(time_t); 346 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 347 p += sizeof pwd.pw_fields; 348 sdata.size = p - sbuf; 349 350 /* Store insecure by name. */ 351 tbuf[0] = _PW_KEYBYNAME; 352 len = strlen(pwd.pw_name); 353 memmove(tbuf + 1, pwd.pw_name, len); 354 key.size = len + 1; 355 if ((dp->put)(dp, &key, &data, method) == -1) 356 error("put"); 357 358 /* Store insecure by number. */ 359 tbuf[0] = _PW_KEYBYNUM; 360 memmove(tbuf + 1, &cnt, sizeof(cnt)); 361 key.size = sizeof(cnt) + 1; 362 if ((dp->put)(dp, &key, &data, method) == -1) 363 error("put"); 364 365 /* Store insecure by uid. */ 366 tbuf[0] = _PW_KEYBYUID; 367 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 368 key.size = sizeof(pwd.pw_uid) + 1; 369 if ((dp->put)(dp, &key, &data, methoduid) == -1) 370 error("put"); 371 372 /* Store secure by name. */ 373 tbuf[0] = _PW_KEYBYNAME; 374 len = strlen(pwd.pw_name); 375 memmove(tbuf + 1, pwd.pw_name, len); 376 key.size = len + 1; 377 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 378 error("put"); 379 380 /* Store secure by number. */ 381 tbuf[0] = _PW_KEYBYNUM; 382 memmove(tbuf + 1, &cnt, sizeof(cnt)); 383 key.size = sizeof(cnt) + 1; 384 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 385 error("put"); 386 387 /* Store secure by uid. */ 388 tbuf[0] = _PW_KEYBYUID; 389 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 390 key.size = sizeof(pwd.pw_uid) + 1; 391 if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1) 392 error("put"); 393 394 /* Store insecure and secure special plus and special minus */ 395 if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') { 396 tbuf[0] = _PW_KEYYPBYNUM; 397 memmove(tbuf + 1, &ypcnt, sizeof(cnt)); 398 ypcnt++; 399 key.size = sizeof(cnt) + 1; 400 if ((dp->put)(dp, &key, &data, method) == -1) 401 error("put"); 402 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 403 error("put"); 404 } 405 } 406 /* Create original format password file entry */ 407 if (is_comment && makeold){ /* copy comments */ 408 if (fprintf(oldfp, "%s\n", line) < 0) 409 error("write old"); 410 } else if (makeold) { 411 char uidstr[20]; 412 char gidstr[20]; 413 414 snprintf(uidstr, sizeof(uidstr), "%u", pwd.pw_uid); 415 snprintf(gidstr, sizeof(gidstr), "%u", pwd.pw_gid); 416 417 if (fprintf(oldfp, "%s:*:%s:%s:%s:%s:%s\n", 418 pwd.pw_name, pwd.pw_fields & _PWF_UID ? uidstr : "", 419 pwd.pw_fields & _PWF_GID ? gidstr : "", 420 pwd.pw_gecos, pwd.pw_dir, pwd.pw_shell) < 0) 421 error("write old"); 422 } 423 } 424 /* If YP enabled, set flag. */ 425 if (yp_enabled) { 426 buf[0] = yp_enabled + 2; 427 data.size = 1; 428 tbuf[0] = _PW_KEYYPENABLED; 429 key.size = 1; 430 if ((dp->put)(dp, &key, &data, method) == -1) 431 error("put"); 432 if ((sdp->put)(sdp, &key, &data, method) == -1) 433 error("put"); 434 } 435 436 if ((dp->close)(dp) == -1) 437 error("close"); 438 if ((sdp->close)(sdp) == -1) 439 error("close"); 440 if (makeold) { 441 (void)fflush(oldfp); 442 if (fclose(oldfp) == EOF) 443 error("close old"); 444 } 445 446 /* Set master.passwd permissions, in case caller forgot. */ 447 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 448 449 /* Install as the real password files. */ 450 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 451 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 452 mv(buf, buf2); 453 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 454 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB); 455 mv(buf, buf2); 456 if (makeold) { 457 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD); 458 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 459 mv(buf, buf2); 460 } 461 /* 462 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 463 * all use flock(2) on it to block other incarnations of themselves. 464 * The rename means that everything is unlocked, as the original file 465 * can no longer be accessed. 466 */ 467 (void)snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD); 468 mv(pname, buf); 469 470 /* 471 * Close locked password file after rename() 472 */ 473 if (fclose(fp) == EOF) 474 error("close fp"); 475 476 exit(0); 477 } 478 479 int 480 scan(fp, pw) 481 FILE *fp; 482 struct passwd *pw; 483 { 484 static int lcnt; 485 char *p; 486 487 if (!fgets(line, sizeof(line), fp)) 488 return (0); 489 ++lcnt; 490 /* 491 * ``... if I swallow anything evil, put your fingers down my 492 * throat...'' 493 * -- The Who 494 */ 495 if (!(p = strchr(line, '\n'))) { 496 warnx("line too long"); 497 goto fmt; 498 499 } 500 *p = '\0'; 501 502 /* 503 * Ignore comments: ^[ \t]*# 504 */ 505 for (p = line; *p != '\0'; p++) 506 if (*p != ' ' && *p != '\t') 507 break; 508 if (*p == '#' || *p == '\0') { 509 is_comment = 1; 510 return(1); 511 } else 512 is_comment = 0; 513 514 if (!pw_scan(line, pw)) { 515 warnx("at line #%d", lcnt); 516 fmt: errno = EFTYPE; /* XXX */ 517 error(pname); 518 } 519 520 return (1); 521 } 522 523 void 524 cp(from, to, mode) 525 char *from, *to; 526 mode_t mode; 527 { 528 static char buf[MAXBSIZE]; 529 int from_fd, rcount, to_fd, wcount; 530 531 if ((from_fd = open(from, O_RDONLY, 0)) < 0) 532 error(from); 533 if ((to_fd = open(to, O_WRONLY|O_CREAT|O_EXCL, mode)) < 0) 534 error(to); 535 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 536 wcount = write(to_fd, buf, rcount); 537 if (rcount != wcount || wcount == -1) { 538 int sverrno = errno; 539 540 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 541 errno = sverrno; 542 error(buf); 543 } 544 } 545 if (rcount < 0) { 546 int sverrno = errno; 547 548 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 549 errno = sverrno; 550 error(buf); 551 } 552 } 553 554 555 void 556 mv(from, to) 557 char *from, *to; 558 { 559 char buf[MAXPATHLEN]; 560 561 if (rename(from, to)) { 562 int sverrno = errno; 563 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 564 errno = sverrno; 565 error(buf); 566 } 567 } 568 569 void 570 error(name) 571 char *name; 572 { 573 574 warn("%s", name); 575 cleanup(); 576 exit(1); 577 } 578 579 void 580 cleanup() 581 { 582 char buf[MAXPATHLEN]; 583 584 switch(clean) { 585 case FILE_ORIG: 586 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 587 (void)unlink(buf); 588 /* FALLTHROUGH */ 589 case FILE_SECURE: 590 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 591 (void)unlink(buf); 592 /* FALLTHROUGH */ 593 case FILE_INSECURE: 594 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 595 (void)unlink(buf); 596 } 597 } 598 599 static void 600 usage() 601 { 602 603 (void)fprintf(stderr, 604 "usage: pwd_mkdb [-C] [-N] [-p] [-d <dest dir>] [-s <cachesize>] [-u <local username>] file\n"); 605 exit(1); 606 } 607