pwd_mkdb.c revision 85572
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 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1991, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static char sccsid[] = "@(#)pwd_mkdb.c 8.5 (Berkeley) 4/20/94"; 43#endif 44static const char rcsid[] = 45 "$FreeBSD: head/usr.sbin/pwd_mkdb/pwd_mkdb.c 85572 2001-10-27 02:13:41Z peter $"; 46#endif /* not lint */ 47 48#include <sys/param.h> 49#include <sys/stat.h> 50 51#include <db.h> 52#include <err.h> 53#include <errno.h> 54#include <fcntl.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 70HASHINFO openinfo = { 71 4096, /* bsize */ 72 32, /* ffactor */ 73 256, /* nelem */ 74 2048 * 1024, /* cachesize */ 75 NULL, /* hash() */ 76 0 /* lorder */ 77}; 78 79static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean; 80static struct passwd pwd; /* password structure */ 81static char *pname; /* password file name */ 82static char prefix[MAXPATHLEN]; 83 84static int is_comment; /* flag for comments */ 85static char line[LINE_MAX]; 86 87void cleanup __P((void)); 88void error __P((char *)); 89void cp __P((char *, char *, mode_t mode)); 90void mv __P((char *, char *)); 91int scan __P((FILE *, struct passwd *)); 92static void usage __P((void)); 93 94int 95main(argc, argv) 96 int argc; 97 char *argv[]; 98{ 99 DB *dp, *sdp, *pw_db; 100 DBT data, sdata, key; 101 FILE *fp, *oldfp; 102 sigset_t set; 103 int ch, cnt, ypcnt, len, makeold, tfd, yp_enabled = 0; 104 int32_t pw_change, pw_expire; 105 char *p, *t; 106 char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024]; 107 char sbuf[MAX(MAXPATHLEN, LINE_MAX * 2)]; 108 char buf2[MAXPATHLEN]; 109 char sbuf2[MAXPATHLEN]; 110 char *username; 111 u_int method, methoduid; 112 int Cflag; 113 int nblock = 0; 114 115 Cflag = 0; 116 strcpy(prefix, _PATH_PWD); 117 makeold = 0; 118 username = NULL; 119 while ((ch = getopt(argc, argv, "Cd:ps:u:vN")) != -1) 120 switch(ch) { 121 case 'C': /* verify only */ 122 Cflag = 1; 123 break; 124 case 'd': 125 strncpy(prefix, optarg, sizeof prefix - 1); 126 break; 127 case 'p': /* create V7 "file.orig" */ 128 makeold = 1; 129 break; 130 case 's': /* change default cachesize */ 131 openinfo.cachesize = atoi(optarg) * 1024 * 1024; 132 break; 133 case 'u': /* only update this record */ 134 username = optarg; 135 break; 136 case 'v': /* backward compatible */ 137 break; 138 case 'N': /* do not wait for lock */ 139 nblock = LOCK_NB; 140 break; 141 default: 142 usage(); 143 } 144 argc -= optind; 145 argv += optind; 146 147 if (argc != 1 || (username && (*username == '+' || *username == '-'))) 148 usage(); 149 150 /* 151 * This could be changed to allow the user to interrupt. 152 * Probably not worth the effort. 153 */ 154 sigemptyset(&set); 155 sigaddset(&set, SIGTSTP); 156 sigaddset(&set, SIGHUP); 157 sigaddset(&set, SIGINT); 158 sigaddset(&set, SIGQUIT); 159 sigaddset(&set, SIGTERM); 160 (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL); 161 162 /* We don't care what the user wants. */ 163 (void)umask(0); 164 165 pname = *argv; 166 167 /* 168 * Open and lock the original password file. We have to check 169 * the hardlink count after we get the lock to handle any potential 170 * unlink/rename race. 171 * 172 * This lock is necessary when someone runs pwd_mkdb manually, directly 173 * on master.passwd, to handle the case where a user might try to 174 * change his password while pwd_mkdb is running. 175 */ 176 for (;;) { 177 struct stat st; 178 179 if (!(fp = fopen(pname, "r"))) 180 error(pname); 181 if (flock(fileno(fp), LOCK_EX|nblock) < 0) 182 error("flock"); 183 if (fstat(fileno(fp), &st) < 0) 184 error(pname); 185 if (st.st_nlink != 0) 186 break; 187 fclose(fp); 188 fp = NULL; 189 } 190 191 /* check only if password database is valid */ 192 if (Cflag) { 193 for (cnt = 1; scan(fp, &pwd); ++cnt); 194 exit(0); 195 } 196 197 /* Open the temporary insecure password database. */ 198 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 199 (void)snprintf(sbuf, sizeof(sbuf), "%s/%s.tmp", prefix, _SMP_DB); 200 if (username) { 201 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 202 (void)snprintf(sbuf2, sizeof(sbuf2), "%s/%s", prefix, _SMP_DB); 203 204 clean = FILE_INSECURE; 205 cp(buf2, buf, PERM_INSECURE); 206 dp = dbopen(buf, 207 O_RDWR|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 208 if (dp == NULL) 209 error(buf); 210 211 clean = FILE_SECURE; 212 cp(sbuf2, sbuf, PERM_SECURE); 213 sdp = dbopen(sbuf, 214 O_RDWR|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 215 if (sdp == NULL) 216 error(sbuf); 217 218 /* 219 * Do some trouble to check if we should store this users 220 * uid. Don't use getpwnam/getpwuid as that interferes 221 * with NIS. 222 */ 223 pw_db = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL); 224 if (!pw_db) 225 error(_MP_DB); 226 buf[0] = _PW_KEYBYNAME; 227 len = strlen(username); 228 229 /* Only check that username fits in buffer */ 230 memmove(buf + 1, username, MIN(len, sizeof(buf) - 1)); 231 key.data = (u_char *)buf; 232 key.size = len + 1; 233 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) { 234 p = (char *)data.data; 235 236 /* jump over pw_name and pw_passwd, to get to pw_uid */ 237 while (*p++) 238 ; 239 while (*p++) 240 ; 241 242 buf[0] = _PW_KEYBYUID; 243 memmove(buf + 1, p, sizeof(int)); 244 key.data = (u_char *)buf; 245 key.size = sizeof(int) + 1; 246 247 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) { 248 /* First field of data.data holds pw_pwname */ 249 if (!strcmp(data.data, username)) 250 methoduid = 0; 251 else 252 methoduid = R_NOOVERWRITE; 253 } else { 254 methoduid = R_NOOVERWRITE; 255 } 256 } else { 257 methoduid = R_NOOVERWRITE; 258 } 259 if ((pw_db->close)(pw_db)) 260 error("close pw_db"); 261 method = 0; 262 } else { 263 dp = dbopen(buf, 264 O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 265 if (dp == NULL) 266 error(buf); 267 clean = FILE_INSECURE; 268 269 sdp = dbopen(sbuf, 270 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 271 if (sdp == NULL) 272 error(sbuf); 273 clean = FILE_SECURE; 274 275 method = R_NOOVERWRITE; 276 methoduid = R_NOOVERWRITE; 277 } 278 279 /* 280 * Open file for old password file. Minor trickiness -- don't want to 281 * chance the file already existing, since someone (stupidly) might 282 * still be using this for permission checking. So, open it first and 283 * fdopen the resulting fd. The resulting file should be readable by 284 * everyone. 285 */ 286 if (makeold) { 287 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 288 if ((tfd = open(buf, 289 O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0) 290 error(buf); 291 if ((oldfp = fdopen(tfd, "w")) == NULL) 292 error(buf); 293 clean = FILE_ORIG; 294 } 295 296 /* 297 * The databases actually contain three copies of the original data. 298 * Each password file entry is converted into a rough approximation 299 * of a ``struct passwd'', with the strings placed inline. This 300 * object is then stored as the data for three separate keys. The 301 * first key * is the pw_name field prepended by the _PW_KEYBYNAME 302 * character. The second key is the pw_uid field prepended by the 303 * _PW_KEYBYUID character. The third key is the line number in the 304 * original file prepended by the _PW_KEYBYNUM character. (The special 305 * characters are prepended to ensure that the keys do not collide.) 306 */ 307 ypcnt = 1; 308 data.data = (u_char *)buf; 309 sdata.data = (u_char *)sbuf; 310 key.data = (u_char *)tbuf; 311 for (cnt = 1; scan(fp, &pwd); ++cnt) { 312 if (!is_comment && 313 (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-')) 314 yp_enabled = 1; 315 if (is_comment) 316 --cnt; 317#define COMPACT(e) t = e; while ((*p++ = *t++)); 318 if (!is_comment && 319 (!username || (strcmp(username, pwd.pw_name) == 0))) { 320 pw_change = pwd.pw_change; 321 pw_expire = pwd.pw_expire; 322 /* Create insecure data. */ 323 p = buf; 324 COMPACT(pwd.pw_name); 325 COMPACT("*"); 326 memmove(p, &pwd.pw_uid, sizeof(pwd.pw_uid)); 327 p += sizeof(int); 328 memmove(p, &pwd.pw_gid, sizeof(pwd.pw_gid)); 329 p += sizeof(int); 330 memmove(p, &pw_change, sizeof(pw_change)); 331 p += sizeof(pw_change); 332 COMPACT(pwd.pw_class); 333 COMPACT(pwd.pw_gecos); 334 COMPACT(pwd.pw_dir); 335 COMPACT(pwd.pw_shell); 336 memmove(p, &pw_expire, sizeof(pw_expire)); 337 p += sizeof(pw_expire); 338 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 339 p += sizeof pwd.pw_fields; 340 data.size = p - buf; 341 342 /* Create secure data. */ 343 p = sbuf; 344 COMPACT(pwd.pw_name); 345 COMPACT(pwd.pw_passwd); 346 memmove(p, &pwd.pw_uid, sizeof(pwd.pw_uid)); 347 p += sizeof(int); 348 memmove(p, &pwd.pw_gid, sizeof(pwd.pw_gid)); 349 p += sizeof(int); 350 memmove(p, &pw_change, sizeof(pw_change)); 351 p += sizeof(pw_change); 352 COMPACT(pwd.pw_class); 353 COMPACT(pwd.pw_gecos); 354 COMPACT(pwd.pw_dir); 355 COMPACT(pwd.pw_shell); 356 memmove(p, &pw_expire, sizeof(pw_expire)); 357 p += sizeof(pw_expire); 358 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 359 p += sizeof pwd.pw_fields; 360 sdata.size = p - sbuf; 361 362 /* Store insecure by name. */ 363 tbuf[0] = _PW_KEYBYNAME; 364 len = strlen(pwd.pw_name); 365 memmove(tbuf + 1, pwd.pw_name, len); 366 key.size = len + 1; 367 if ((dp->put)(dp, &key, &data, method) == -1) 368 error("put"); 369 370 /* Store insecure by number. */ 371 tbuf[0] = _PW_KEYBYNUM; 372 memmove(tbuf + 1, &cnt, sizeof(cnt)); 373 key.size = sizeof(cnt) + 1; 374 if ((dp->put)(dp, &key, &data, method) == -1) 375 error("put"); 376 377 /* Store insecure by uid. */ 378 tbuf[0] = _PW_KEYBYUID; 379 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 380 key.size = sizeof(pwd.pw_uid) + 1; 381 if ((dp->put)(dp, &key, &data, methoduid) == -1) 382 error("put"); 383 384 /* Store secure by name. */ 385 tbuf[0] = _PW_KEYBYNAME; 386 len = strlen(pwd.pw_name); 387 memmove(tbuf + 1, pwd.pw_name, len); 388 key.size = len + 1; 389 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 390 error("put"); 391 392 /* Store secure by number. */ 393 tbuf[0] = _PW_KEYBYNUM; 394 memmove(tbuf + 1, &cnt, sizeof(cnt)); 395 key.size = sizeof(cnt) + 1; 396 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 397 error("put"); 398 399 /* Store secure by uid. */ 400 tbuf[0] = _PW_KEYBYUID; 401 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 402 key.size = sizeof(pwd.pw_uid) + 1; 403 if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1) 404 error("put"); 405 406 /* Store insecure and secure special plus and special minus */ 407 if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') { 408 tbuf[0] = _PW_KEYYPBYNUM; 409 memmove(tbuf + 1, &ypcnt, sizeof(cnt)); 410 ypcnt++; 411 key.size = sizeof(cnt) + 1; 412 if ((dp->put)(dp, &key, &data, method) == -1) 413 error("put"); 414 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 415 error("put"); 416 } 417 } 418 /* Create original format password file entry */ 419 if (is_comment && makeold){ /* copy comments */ 420 if (fprintf(oldfp, "%s\n", line) < 0) 421 error("write old"); 422 } else if (makeold) { 423 char uidstr[20]; 424 char gidstr[20]; 425 426 snprintf(uidstr, sizeof(uidstr), "%u", pwd.pw_uid); 427 snprintf(gidstr, sizeof(gidstr), "%u", pwd.pw_gid); 428 429 if (fprintf(oldfp, "%s:*:%s:%s:%s:%s:%s\n", 430 pwd.pw_name, pwd.pw_fields & _PWF_UID ? uidstr : "", 431 pwd.pw_fields & _PWF_GID ? gidstr : "", 432 pwd.pw_gecos, pwd.pw_dir, pwd.pw_shell) < 0) 433 error("write old"); 434 } 435 } 436 /* If YP enabled, set flag. */ 437 if (yp_enabled) { 438 buf[0] = yp_enabled + 2; 439 data.size = 1; 440 tbuf[0] = _PW_KEYYPENABLED; 441 key.size = 1; 442 if ((dp->put)(dp, &key, &data, method) == -1) 443 error("put"); 444 if ((sdp->put)(sdp, &key, &data, method) == -1) 445 error("put"); 446 } 447 448 if ((dp->close)(dp) == -1) 449 error("close"); 450 if ((sdp->close)(sdp) == -1) 451 error("close"); 452 if (makeold) { 453 (void)fflush(oldfp); 454 if (fclose(oldfp) == EOF) 455 error("close old"); 456 } 457 458 /* Set master.passwd permissions, in case caller forgot. */ 459 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 460 461 /* Install as the real password files. */ 462 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 463 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 464 mv(buf, buf2); 465 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 466 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB); 467 mv(buf, buf2); 468 if (makeold) { 469 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD); 470 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 471 mv(buf, buf2); 472 } 473 /* 474 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 475 * all use flock(2) on it to block other incarnations of themselves. 476 * The rename means that everything is unlocked, as the original file 477 * can no longer be accessed. 478 */ 479 (void)snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD); 480 mv(pname, buf); 481 482 /* 483 * Close locked password file after rename() 484 */ 485 if (fclose(fp) == EOF) 486 error("close fp"); 487 488 exit(0); 489} 490 491int 492scan(fp, pw) 493 FILE *fp; 494 struct passwd *pw; 495{ 496 static int lcnt; 497 char *p; 498 499 if (!fgets(line, sizeof(line), fp)) 500 return (0); 501 ++lcnt; 502 /* 503 * ``... if I swallow anything evil, put your fingers down my 504 * throat...'' 505 * -- The Who 506 */ 507 if (!(p = strchr(line, '\n'))) { 508 warnx("line too long"); 509 goto fmt; 510 511 } 512 *p = '\0'; 513 514 /* 515 * Ignore comments: ^[ \t]*# 516 */ 517 for (p = line; *p != '\0'; p++) 518 if (*p != ' ' && *p != '\t') 519 break; 520 if (*p == '#' || *p == '\0') { 521 is_comment = 1; 522 return(1); 523 } else 524 is_comment = 0; 525 526 if (!__pw_scan(line, pw, _PWSCAN_WARN|_PWSCAN_MASTER)) { 527 warnx("at line #%d", lcnt); 528fmt: errno = EFTYPE; /* XXX */ 529 error(pname); 530 } 531 532 return (1); 533} 534 535void 536cp(from, to, mode) 537 char *from, *to; 538 mode_t mode; 539{ 540 static char buf[MAXBSIZE]; 541 int from_fd, rcount, to_fd, wcount; 542 543 if ((from_fd = open(from, O_RDONLY, 0)) < 0) 544 error(from); 545 if ((to_fd = open(to, O_WRONLY|O_CREAT|O_EXCL, mode)) < 0) 546 error(to); 547 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 548 wcount = write(to_fd, buf, rcount); 549 if (rcount != wcount || wcount == -1) { 550 int sverrno = errno; 551 552 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 553 errno = sverrno; 554 error(buf); 555 } 556 } 557 if (rcount < 0) { 558 int sverrno = errno; 559 560 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 561 errno = sverrno; 562 error(buf); 563 } 564} 565 566 567void 568mv(from, to) 569 char *from, *to; 570{ 571 char buf[MAXPATHLEN]; 572 573 if (rename(from, to)) { 574 int sverrno = errno; 575 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 576 errno = sverrno; 577 error(buf); 578 } 579} 580 581void 582error(name) 583 char *name; 584{ 585 586 warn("%s", name); 587 cleanup(); 588 exit(1); 589} 590 591void 592cleanup() 593{ 594 char buf[MAXPATHLEN]; 595 596 switch(clean) { 597 case FILE_ORIG: 598 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 599 (void)unlink(buf); 600 /* FALLTHROUGH */ 601 case FILE_SECURE: 602 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 603 (void)unlink(buf); 604 /* FALLTHROUGH */ 605 case FILE_INSECURE: 606 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 607 (void)unlink(buf); 608 } 609} 610 611static void 612usage() 613{ 614 615 (void)fprintf(stderr, 616"usage: pwd_mkdb [-C] [-N] [-p] [-d <dest dir>] [-s <cachesize>] [-u <local username>] file\n"); 617 exit(1); 618} 619