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 1.5 2005/12/05 02:40:27 swildner 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(int argc, char *argv[]) 87 { 88 DB *dp, *sdp, *pw_db; 89 DBT data, sdata, key; 90 FILE *fp, *oldfp; 91 sigset_t set; 92 int ch, cnt, ypcnt, len, makeold, tfd, yp_enabled = 0; 93 char *p, *t; 94 char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024]; 95 char sbuf[MAX(MAXPATHLEN, LINE_MAX * 2)]; 96 char buf2[MAXPATHLEN]; 97 char sbuf2[MAXPATHLEN]; 98 char *username; 99 u_int method, methoduid; 100 int Cflag; 101 int nblock = 0; 102 103 Cflag = 0; 104 strcpy(prefix, _PATH_PWD); 105 makeold = 0; 106 username = NULL; 107 while ((ch = getopt(argc, argv, "Cd:ps:u:vN")) != -1) 108 switch(ch) { 109 case 'C': /* verify only */ 110 Cflag = 1; 111 break; 112 case 'd': 113 strncpy(prefix, optarg, sizeof prefix - 1); 114 break; 115 case 'p': /* create V7 "file.orig" */ 116 makeold = 1; 117 break; 118 case 's': /* change default cachesize */ 119 openinfo.cachesize = atoi(optarg) * 1024 * 1024; 120 break; 121 case 'u': /* only update this record */ 122 username = optarg; 123 break; 124 case 'v': /* backward compatible */ 125 break; 126 case 'N': /* do not wait for lock */ 127 nblock = LOCK_NB; 128 break; 129 default: 130 usage(); 131 } 132 argc -= optind; 133 argv += optind; 134 135 if (argc != 1 || (username && (*username == '+' || *username == '-'))) 136 usage(); 137 138 /* 139 * This could be changed to allow the user to interrupt. 140 * Probably not worth the effort. 141 */ 142 sigemptyset(&set); 143 sigaddset(&set, SIGTSTP); 144 sigaddset(&set, SIGHUP); 145 sigaddset(&set, SIGINT); 146 sigaddset(&set, SIGQUIT); 147 sigaddset(&set, SIGTERM); 148 sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL); 149 150 /* We don't care what the user wants. */ 151 umask(0); 152 153 pname = *argv; 154 155 /* 156 * Open and lock the original password file. We have to check 157 * the hardlink count after we get the lock to handle any potential 158 * unlink/rename race. 159 * 160 * This lock is necessary when someone runs pwd_mkdb manually, directly 161 * on master.passwd, to handle the case where a user might try to 162 * change his password while pwd_mkdb is running. 163 */ 164 for (;;) { 165 struct stat st; 166 167 if (!(fp = fopen(pname, "r"))) 168 error(pname); 169 if (flock(fileno(fp), LOCK_EX|nblock) < 0) 170 error("flock"); 171 if (fstat(fileno(fp), &st) < 0) 172 error(pname); 173 if (st.st_nlink != 0) 174 break; 175 fclose(fp); 176 fp = NULL; 177 } 178 179 /* check only if password database is valid */ 180 if (Cflag) { 181 for (cnt = 1; scan(fp, &pwd); ++cnt); 182 exit(0); 183 } 184 185 /* Open the temporary insecure password database. */ 186 snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 187 snprintf(sbuf, sizeof(sbuf), "%s/%s.tmp", prefix, _SMP_DB); 188 if (username) { 189 snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 190 snprintf(sbuf2, sizeof(sbuf2), "%s/%s", prefix, _SMP_DB); 191 192 clean = FILE_INSECURE; 193 cp(buf2, buf, PERM_INSECURE); 194 dp = dbopen(buf, 195 O_RDWR|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 196 if (dp == NULL) 197 error(buf); 198 199 clean = FILE_SECURE; 200 cp(sbuf2, sbuf, PERM_SECURE); 201 sdp = dbopen(sbuf, 202 O_RDWR|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 203 if (sdp == NULL) 204 error(sbuf); 205 206 /* 207 * Do some trouble to check if we should store this users 208 * uid. Don't use getpwnam/getpwuid as that interferes 209 * with NIS. 210 */ 211 pw_db = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL); 212 if (!pw_db) 213 error(_MP_DB); 214 buf[0] = _PW_KEYBYNAME; 215 len = strlen(username); 216 217 /* Only check that username fits in buffer */ 218 memmove(buf + 1, username, MIN(len, sizeof(buf) - 1)); 219 key.data = (u_char *)buf; 220 key.size = len + 1; 221 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) { 222 p = (char *)data.data; 223 224 /* jump over pw_name and pw_passwd, to get to pw_uid */ 225 while (*p++) 226 ; 227 while (*p++) 228 ; 229 230 buf[0] = _PW_KEYBYUID; 231 memmove(buf + 1, p, sizeof(int)); 232 key.data = (u_char *)buf; 233 key.size = sizeof(int) + 1; 234 235 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) { 236 /* First field of data.data holds pw_pwname */ 237 if (!strcmp(data.data, username)) 238 methoduid = 0; 239 else 240 methoduid = R_NOOVERWRITE; 241 } else { 242 methoduid = R_NOOVERWRITE; 243 } 244 } else { 245 methoduid = R_NOOVERWRITE; 246 } 247 if ((pw_db->close)(pw_db)) 248 error("close pw_db"); 249 method = 0; 250 } else { 251 dp = dbopen(buf, 252 O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 253 if (dp == NULL) 254 error(buf); 255 clean = FILE_INSECURE; 256 257 sdp = dbopen(sbuf, 258 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 259 if (sdp == NULL) 260 error(sbuf); 261 clean = FILE_SECURE; 262 263 method = R_NOOVERWRITE; 264 methoduid = R_NOOVERWRITE; 265 } 266 267 /* 268 * Open file for old password file. Minor trickiness -- don't want to 269 * chance the file already existing, since someone (stupidly) might 270 * still be using this for permission checking. So, open it first and 271 * fdopen the resulting fd. The resulting file should be readable by 272 * everyone. 273 */ 274 if (makeold) { 275 snprintf(buf, sizeof(buf), "%s.orig", pname); 276 if ((tfd = open(buf, 277 O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0) 278 error(buf); 279 if ((oldfp = fdopen(tfd, "w")) == NULL) 280 error(buf); 281 clean = FILE_ORIG; 282 } 283 284 /* 285 * The databases actually contain three copies of the original data. 286 * Each password file entry is converted into a rough approximation 287 * of a ``struct passwd'', with the strings placed inline. This 288 * object is then stored as the data for three separate keys. The 289 * first key * is the pw_name field prepended by the _PW_KEYBYNAME 290 * character. The second key is the pw_uid field prepended by the 291 * _PW_KEYBYUID character. The third key is the line number in the 292 * original file prepended by the _PW_KEYBYNUM character. (The special 293 * characters are prepended to ensure that the keys do not collide.) 294 */ 295 ypcnt = 1; 296 data.data = (u_char *)buf; 297 sdata.data = (u_char *)sbuf; 298 key.data = (u_char *)tbuf; 299 for (cnt = 1; scan(fp, &pwd); ++cnt) { 300 if (!is_comment && 301 (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-')) 302 yp_enabled = 1; 303 if (is_comment) 304 --cnt; 305 #define COMPACT(e) t = e; while ((*p++ = *t++)); 306 if (!is_comment && 307 (!username || (strcmp(username, pwd.pw_name) == 0))) { 308 /* Create insecure data. */ 309 p = buf; 310 COMPACT(pwd.pw_name); 311 COMPACT("*"); 312 memmove(p, &pwd.pw_uid, sizeof(pwd.pw_uid)); 313 p += sizeof(int); 314 memmove(p, &pwd.pw_gid, sizeof(pwd.pw_gid)); 315 p += sizeof(int); 316 memmove(p, &pwd.pw_change, sizeof(time_t)); 317 p += sizeof(time_t); 318 COMPACT(pwd.pw_class); 319 COMPACT(pwd.pw_gecos); 320 COMPACT(pwd.pw_dir); 321 COMPACT(pwd.pw_shell); 322 memmove(p, &pwd.pw_expire, sizeof(time_t)); 323 p += sizeof(time_t); 324 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 325 p += sizeof pwd.pw_fields; 326 data.size = p - buf; 327 328 /* Create secure data. */ 329 p = sbuf; 330 COMPACT(pwd.pw_name); 331 COMPACT(pwd.pw_passwd); 332 memmove(p, &pwd.pw_uid, sizeof(pwd.pw_uid)); 333 p += sizeof(int); 334 memmove(p, &pwd.pw_gid, sizeof(pwd.pw_gid)); 335 p += sizeof(int); 336 memmove(p, &pwd.pw_change, sizeof(time_t)); 337 p += sizeof(time_t); 338 COMPACT(pwd.pw_class); 339 COMPACT(pwd.pw_gecos); 340 COMPACT(pwd.pw_dir); 341 COMPACT(pwd.pw_shell); 342 memmove(p, &pwd.pw_expire, sizeof(time_t)); 343 p += sizeof(time_t); 344 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 345 p += sizeof pwd.pw_fields; 346 sdata.size = p - sbuf; 347 348 /* Store insecure by name. */ 349 tbuf[0] = _PW_KEYBYNAME; 350 len = strlen(pwd.pw_name); 351 memmove(tbuf + 1, pwd.pw_name, len); 352 key.size = len + 1; 353 if ((dp->put)(dp, &key, &data, method) == -1) 354 error("put"); 355 356 /* Store insecure by number. */ 357 tbuf[0] = _PW_KEYBYNUM; 358 memmove(tbuf + 1, &cnt, sizeof(cnt)); 359 key.size = sizeof(cnt) + 1; 360 if ((dp->put)(dp, &key, &data, method) == -1) 361 error("put"); 362 363 /* Store insecure by uid. */ 364 tbuf[0] = _PW_KEYBYUID; 365 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 366 key.size = sizeof(pwd.pw_uid) + 1; 367 if ((dp->put)(dp, &key, &data, methoduid) == -1) 368 error("put"); 369 370 /* Store secure by name. */ 371 tbuf[0] = _PW_KEYBYNAME; 372 len = strlen(pwd.pw_name); 373 memmove(tbuf + 1, pwd.pw_name, len); 374 key.size = len + 1; 375 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 376 error("put"); 377 378 /* Store secure by number. */ 379 tbuf[0] = _PW_KEYBYNUM; 380 memmove(tbuf + 1, &cnt, sizeof(cnt)); 381 key.size = sizeof(cnt) + 1; 382 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 383 error("put"); 384 385 /* Store secure by uid. */ 386 tbuf[0] = _PW_KEYBYUID; 387 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 388 key.size = sizeof(pwd.pw_uid) + 1; 389 if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1) 390 error("put"); 391 392 /* Store insecure and secure special plus and special minus */ 393 if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') { 394 tbuf[0] = _PW_KEYYPBYNUM; 395 memmove(tbuf + 1, &ypcnt, sizeof(cnt)); 396 ypcnt++; 397 key.size = sizeof(cnt) + 1; 398 if ((dp->put)(dp, &key, &data, method) == -1) 399 error("put"); 400 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 401 error("put"); 402 } 403 } 404 /* Create original format password file entry */ 405 if (is_comment && makeold){ /* copy comments */ 406 if (fprintf(oldfp, "%s\n", line) < 0) 407 error("write old"); 408 } else if (makeold) { 409 char uidstr[20]; 410 char gidstr[20]; 411 412 snprintf(uidstr, sizeof(uidstr), "%u", pwd.pw_uid); 413 snprintf(gidstr, sizeof(gidstr), "%u", pwd.pw_gid); 414 415 if (fprintf(oldfp, "%s:*:%s:%s:%s:%s:%s\n", 416 pwd.pw_name, pwd.pw_fields & _PWF_UID ? uidstr : "", 417 pwd.pw_fields & _PWF_GID ? gidstr : "", 418 pwd.pw_gecos, pwd.pw_dir, pwd.pw_shell) < 0) 419 error("write old"); 420 } 421 } 422 /* If YP enabled, set flag. */ 423 if (yp_enabled) { 424 buf[0] = yp_enabled + 2; 425 data.size = 1; 426 tbuf[0] = _PW_KEYYPENABLED; 427 key.size = 1; 428 if ((dp->put)(dp, &key, &data, method) == -1) 429 error("put"); 430 if ((sdp->put)(sdp, &key, &data, method) == -1) 431 error("put"); 432 } 433 434 if ((dp->close)(dp) == -1) 435 error("close"); 436 if ((sdp->close)(sdp) == -1) 437 error("close"); 438 if (makeold) { 439 fflush(oldfp); 440 if (fclose(oldfp) == EOF) 441 error("close old"); 442 } 443 444 /* Set master.passwd permissions, in case caller forgot. */ 445 fchmod(fileno(fp), S_IRUSR|S_IWUSR); 446 447 /* Install as the real password files. */ 448 snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 449 snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 450 mv(buf, buf2); 451 snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 452 snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB); 453 mv(buf, buf2); 454 if (makeold) { 455 snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD); 456 snprintf(buf, sizeof(buf), "%s.orig", pname); 457 mv(buf, buf2); 458 } 459 /* 460 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 461 * all use flock(2) on it to block other incarnations of themselves. 462 * The rename means that everything is unlocked, as the original file 463 * can no longer be accessed. 464 */ 465 snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD); 466 mv(pname, buf); 467 468 /* 469 * Close locked password file after rename() 470 */ 471 if (fclose(fp) == EOF) 472 error("close fp"); 473 474 exit(0); 475 } 476 477 int 478 scan(FILE *fp, struct passwd *pw) 479 { 480 static int lcnt; 481 char *p; 482 483 if (!fgets(line, sizeof(line), fp)) 484 return (0); 485 ++lcnt; 486 /* 487 * ``... if I swallow anything evil, put your fingers down my 488 * throat...'' 489 * -- The Who 490 */ 491 if (!(p = strchr(line, '\n'))) { 492 warnx("line too long"); 493 goto fmt; 494 495 } 496 *p = '\0'; 497 498 /* 499 * Ignore comments: ^[ \t]*# 500 */ 501 for (p = line; *p != '\0'; p++) 502 if (*p != ' ' && *p != '\t') 503 break; 504 if (*p == '#' || *p == '\0') { 505 is_comment = 1; 506 return(1); 507 } else 508 is_comment = 0; 509 510 if (!pw_scan(line, pw)) { 511 warnx("at line #%d", lcnt); 512 fmt: errno = EFTYPE; /* XXX */ 513 error(pname); 514 } 515 516 return (1); 517 } 518 519 void 520 cp(char *from, char *to, mode_t mode) 521 { 522 static char buf[MAXBSIZE]; 523 int from_fd, rcount, to_fd, wcount; 524 525 if ((from_fd = open(from, O_RDONLY, 0)) < 0) 526 error(from); 527 if ((to_fd = open(to, O_WRONLY|O_CREAT|O_EXCL, mode)) < 0) 528 error(to); 529 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 530 wcount = write(to_fd, buf, rcount); 531 if (rcount != wcount || wcount == -1) { 532 int sverrno = errno; 533 534 snprintf(buf, sizeof(buf), "%s to %s", from, to); 535 errno = sverrno; 536 error(buf); 537 } 538 } 539 if (rcount < 0) { 540 int sverrno = errno; 541 542 snprintf(buf, sizeof(buf), "%s to %s", from, to); 543 errno = sverrno; 544 error(buf); 545 } 546 } 547 548 549 void 550 mv(char *from, char *to) 551 { 552 char buf[MAXPATHLEN]; 553 554 if (rename(from, to)) { 555 int sverrno = errno; 556 snprintf(buf, sizeof(buf), "%s to %s", from, to); 557 errno = sverrno; 558 error(buf); 559 } 560 } 561 562 void 563 error(char *name) 564 { 565 warn("%s", name); 566 cleanup(); 567 exit(1); 568 } 569 570 void 571 cleanup(void) 572 { 573 char buf[MAXPATHLEN]; 574 575 switch(clean) { 576 case FILE_ORIG: 577 snprintf(buf, sizeof(buf), "%s.orig", pname); 578 unlink(buf); 579 /* FALLTHROUGH */ 580 case FILE_SECURE: 581 snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 582 unlink(buf); 583 /* FALLTHROUGH */ 584 case FILE_INSECURE: 585 snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 586 unlink(buf); 587 } 588 } 589 590 static void 591 usage(void) 592 { 593 594 fprintf(stderr, 595 "usage: pwd_mkdb [-C] [-N] [-p] [-d <dest dir>] [-s <cachesize>] [-u <local username>] file\n"); 596 exit(1); 597 } 598