pwd_mkdb.c revision 51025
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 51025 1999-09-06 17:30:03Z 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 char *p, *t; 105 char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024]; 106 char sbuf[MAX(MAXPATHLEN, LINE_MAX * 2)]; 107 char buf2[MAXPATHLEN]; 108 char sbuf2[MAXPATHLEN]; 109 char *username; 110 u_int method, methoduid; 111 int Cflag; 112 int nblock = 0; 113 114 Cflag = 0; 115 strcpy(prefix, _PATH_PWD); 116 makeold = 0; 117 username = NULL; 118 while ((ch = getopt(argc, argv, "Cd:ps:u:vN")) != -1) 119 switch(ch) { 120 case 'C': /* verify only */ 121 Cflag = 1; 122 break; 123 case 'd': 124 strncpy(prefix, optarg, sizeof prefix - 1); 125 break; 126 case 'p': /* create V7 "file.orig" */ 127 makeold = 1; 128 break; 129 case 's': /* change default cachesize */ 130 openinfo.cachesize = atoi(optarg) * 1024 * 1024; 131 break; 132 case 'u': /* only update this record */ 133 username = optarg; 134 break; 135 case 'v': /* backward compatible */ 136 break; 137 case 'N': /* do not wait for lock */ 138 nblock = LOCK_NB; 139 break; 140 default: 141 usage(); 142 } 143 argc -= optind; 144 argv += optind; 145 146 if (argc != 1 || (username && (*username == '+' || *username == '-'))) 147 usage(); 148 149 /* 150 * This could be changed to allow the user to interrupt. 151 * Probably not worth the effort. 152 */ 153 sigemptyset(&set); 154 sigaddset(&set, SIGTSTP); 155 sigaddset(&set, SIGHUP); 156 sigaddset(&set, SIGINT); 157 sigaddset(&set, SIGQUIT); 158 sigaddset(&set, SIGTERM); 159 (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL); 160 161 /* We don't care what the user wants. */ 162 (void)umask(0); 163 164 pname = *argv; 165 166 /* 167 * Open and lock the original password file. We have to check 168 * the hardlink count after we get the lock to handle any potential 169 * unlink/rename race. 170 * 171 * This lock is necessary when someone runs pwd_mkdb manually, directly 172 * on master.passwd, to handle the case where a user might try to 173 * change his password while pwd_mkdb is running. 174 */ 175 for (;;) { 176 struct stat st; 177 178 if (!(fp = fopen(pname, "r"))) 179 error(pname); 180 if (flock(fileno(fp), LOCK_EX|nblock) < 0) 181 error("flock"); 182 if (fstat(fileno(fp), &st) < 0) 183 error(pname); 184 if (st.st_nlink != 0) 185 break; 186 fclose(fp); 187 fp = NULL; 188 } 189 190 /* check only if password database is valid */ 191 if (Cflag) { 192 for (cnt = 1; scan(fp, &pwd); ++cnt); 193 exit(0); 194 } 195 196 /* Open the temporary insecure password database. */ 197 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 198 (void)snprintf(sbuf, sizeof(sbuf), "%s/%s.tmp", prefix, _SMP_DB); 199 if (username) { 200 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 201 (void)snprintf(sbuf2, sizeof(sbuf2), "%s/%s", prefix, _SMP_DB); 202 203 clean = FILE_INSECURE; 204 cp(buf2, buf, PERM_INSECURE); 205 dp = dbopen(buf, 206 O_RDWR|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 207 if (dp == NULL) 208 error(buf); 209 210 clean = FILE_SECURE; 211 cp(sbuf2, sbuf, PERM_SECURE); 212 sdp = dbopen(sbuf, 213 O_RDWR|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 214 if (sdp == NULL) 215 error(sbuf); 216 217 /* 218 * Do some trouble to check if we should store this users 219 * uid. Don't use getpwnam/getpwuid as that interferes 220 * with NIS. 221 */ 222 pw_db = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL); 223 if (!pw_db) 224 error(_MP_DB); 225 buf[0] = _PW_KEYBYNAME; 226 len = strlen(username); 227 228 /* Only check that username fits in buffer */ 229 memmove(buf + 1, username, MIN(len, sizeof(buf) - 1)); 230 key.data = (u_char *)buf; 231 key.size = len + 1; 232 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) { 233 p = (char *)data.data; 234 235 /* jump over pw_name and pw_passwd, to get to pw_uid */ 236 while (*p++) 237 ; 238 while (*p++) 239 ; 240 241 buf[0] = _PW_KEYBYUID; 242 memmove(buf + 1, p, sizeof(int)); 243 key.data = (u_char *)buf; 244 key.size = sizeof(int) + 1; 245 246 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) { 247 /* First field of data.data holds pw_pwname */ 248 if (!strcmp(data.data, username)) 249 methoduid = 0; 250 else 251 methoduid = R_NOOVERWRITE; 252 } else { 253 methoduid = R_NOOVERWRITE; 254 } 255 } else { 256 methoduid = R_NOOVERWRITE; 257 } 258 if ((pw_db->close)(pw_db)) 259 error("close pw_db"); 260 method = 0; 261 } else { 262 dp = dbopen(buf, 263 O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 264 if (dp == NULL) 265 error(buf); 266 clean = FILE_INSECURE; 267 268 sdp = dbopen(sbuf, 269 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 270 if (sdp == NULL) 271 error(sbuf); 272 clean = FILE_SECURE; 273 274 method = R_NOOVERWRITE; 275 methoduid = R_NOOVERWRITE; 276 } 277 278 /* 279 * Open file for old password file. Minor trickiness -- don't want to 280 * chance the file already existing, since someone (stupidly) might 281 * still be using this for permission checking. So, open it first and 282 * fdopen the resulting fd. The resulting file should be readable by 283 * everyone. 284 */ 285 if (makeold) { 286 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 287 if ((tfd = open(buf, 288 O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0) 289 error(buf); 290 if ((oldfp = fdopen(tfd, "w")) == NULL) 291 error(buf); 292 clean = FILE_ORIG; 293 } 294 295 /* 296 * The databases actually contain three copies of the original data. 297 * Each password file entry is converted into a rough approximation 298 * of a ``struct passwd'', with the strings placed inline. This 299 * object is then stored as the data for three separate keys. The 300 * first key * is the pw_name field prepended by the _PW_KEYBYNAME 301 * character. The second key is the pw_uid field prepended by the 302 * _PW_KEYBYUID character. The third key is the line number in the 303 * original file prepended by the _PW_KEYBYNUM character. (The special 304 * characters are prepended to ensure that the keys do not collide.) 305 */ 306 ypcnt = 1; 307 data.data = (u_char *)buf; 308 sdata.data = (u_char *)sbuf; 309 key.data = (u_char *)tbuf; 310 for (cnt = 1; scan(fp, &pwd); ++cnt) { 311 if (!is_comment && 312 (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-')) 313 yp_enabled = 1; 314 if (is_comment) 315 --cnt; 316#define COMPACT(e) t = e; while ((*p++ = *t++)); 317 if (!is_comment && 318 (!username || (strcmp(username, pwd.pw_name) == 0))) { 319 /* Create insecure data. */ 320 p = buf; 321 COMPACT(pwd.pw_name); 322 COMPACT("*"); 323 memmove(p, &pwd.pw_uid, sizeof(int)); 324 p += sizeof(int); 325 memmove(p, &pwd.pw_gid, sizeof(int)); 326 p += sizeof(int); 327 memmove(p, &pwd.pw_change, sizeof(time_t)); 328 p += sizeof(time_t); 329 COMPACT(pwd.pw_class); 330 COMPACT(pwd.pw_gecos); 331 COMPACT(pwd.pw_dir); 332 COMPACT(pwd.pw_shell); 333 memmove(p, &pwd.pw_expire, sizeof(time_t)); 334 p += sizeof(time_t); 335 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 336 p += sizeof pwd.pw_fields; 337 data.size = p - buf; 338 339 /* Create secure data. */ 340 p = sbuf; 341 COMPACT(pwd.pw_name); 342 COMPACT(pwd.pw_passwd); 343 memmove(p, &pwd.pw_uid, sizeof(int)); 344 p += sizeof(int); 345 memmove(p, &pwd.pw_gid, sizeof(int)); 346 p += sizeof(int); 347 memmove(p, &pwd.pw_change, sizeof(time_t)); 348 p += sizeof(time_t); 349 COMPACT(pwd.pw_class); 350 COMPACT(pwd.pw_gecos); 351 COMPACT(pwd.pw_dir); 352 COMPACT(pwd.pw_shell); 353 memmove(p, &pwd.pw_expire, sizeof(time_t)); 354 p += sizeof(time_t); 355 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 356 p += sizeof pwd.pw_fields; 357 sdata.size = p - sbuf; 358 359 /* Store insecure by name. */ 360 tbuf[0] = _PW_KEYBYNAME; 361 len = strlen(pwd.pw_name); 362 memmove(tbuf + 1, pwd.pw_name, len); 363 key.size = len + 1; 364 if ((dp->put)(dp, &key, &data, method) == -1) 365 error("put"); 366 367 /* Store insecure by number. */ 368 tbuf[0] = _PW_KEYBYNUM; 369 memmove(tbuf + 1, &cnt, sizeof(cnt)); 370 key.size = sizeof(cnt) + 1; 371 if ((dp->put)(dp, &key, &data, method) == -1) 372 error("put"); 373 374 /* Store insecure by uid. */ 375 tbuf[0] = _PW_KEYBYUID; 376 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 377 key.size = sizeof(pwd.pw_uid) + 1; 378 if ((dp->put)(dp, &key, &data, methoduid) == -1) 379 error("put"); 380 381 /* Store secure by name. */ 382 tbuf[0] = _PW_KEYBYNAME; 383 len = strlen(pwd.pw_name); 384 memmove(tbuf + 1, pwd.pw_name, len); 385 key.size = len + 1; 386 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 387 error("put"); 388 389 /* Store secure by number. */ 390 tbuf[0] = _PW_KEYBYNUM; 391 memmove(tbuf + 1, &cnt, sizeof(cnt)); 392 key.size = sizeof(cnt) + 1; 393 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 394 error("put"); 395 396 /* Store secure by uid. */ 397 tbuf[0] = _PW_KEYBYUID; 398 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 399 key.size = sizeof(pwd.pw_uid) + 1; 400 if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1) 401 error("put"); 402 403 /* Store insecure and secure special plus and special minus */ 404 if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') { 405 tbuf[0] = _PW_KEYYPBYNUM; 406 memmove(tbuf + 1, &ypcnt, sizeof(cnt)); 407 ypcnt++; 408 key.size = sizeof(cnt) + 1; 409 if ((dp->put)(dp, &key, &data, method) == -1) 410 error("put"); 411 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 412 error("put"); 413 } 414 } 415 /* Create original format password file entry */ 416 if (is_comment && makeold){ /* copy comments */ 417 if (fprintf(oldfp, "%s\n", line) < 0) 418 error("write old"); 419 } else if (makeold) { 420 char uidstr[20]; 421 char gidstr[20]; 422 423 snprintf(uidstr, sizeof(uidstr), "%d", pwd.pw_uid); 424 snprintf(gidstr, sizeof(gidstr), "%d", pwd.pw_gid); 425 426 if (fprintf(oldfp, "%s:*:%s:%s:%s:%s:%s\n", 427 pwd.pw_name, pwd.pw_fields & _PWF_UID ? uidstr : "", 428 pwd.pw_fields & _PWF_GID ? gidstr : "", 429 pwd.pw_gecos, pwd.pw_dir, pwd.pw_shell) < 0) 430 error("write old"); 431 } 432 } 433 /* If YP enabled, set flag. */ 434 if (yp_enabled) { 435 buf[0] = yp_enabled + 2; 436 data.size = 1; 437 tbuf[0] = _PW_KEYYPENABLED; 438 key.size = 1; 439 if ((dp->put)(dp, &key, &data, method) == -1) 440 error("put"); 441 if ((sdp->put)(sdp, &key, &data, method) == -1) 442 error("put"); 443 } 444 445 if ((dp->close)(dp) == -1) 446 error("close"); 447 if ((sdp->close)(sdp) == -1) 448 error("close"); 449 if (makeold) { 450 (void)fflush(oldfp); 451 if (fclose(oldfp) == EOF) 452 error("close old"); 453 } 454 455 /* Set master.passwd permissions, in case caller forgot. */ 456 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 457 458 /* Install as the real password files. */ 459 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 460 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 461 mv(buf, buf2); 462 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 463 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB); 464 mv(buf, buf2); 465 if (makeold) { 466 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD); 467 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 468 mv(buf, buf2); 469 } 470 /* 471 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 472 * all use flock(2) on it to block other incarnations of themselves. 473 * The rename means that everything is unlocked, as the original file 474 * can no longer be accessed. 475 */ 476 (void)snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD); 477 mv(pname, buf); 478 479 /* 480 * Close locked password file after rename() 481 */ 482 if (fclose(fp) == EOF) 483 error("close fp"); 484 485 exit(0); 486} 487 488int 489scan(fp, pw) 490 FILE *fp; 491 struct passwd *pw; 492{ 493 static int lcnt; 494 char *p; 495 496 if (!fgets(line, sizeof(line), fp)) 497 return (0); 498 ++lcnt; 499 /* 500 * ``... if I swallow anything evil, put your fingers down my 501 * throat...'' 502 * -- The Who 503 */ 504 if (!(p = strchr(line, '\n'))) { 505 warnx("line too long"); 506 goto fmt; 507 508 } 509 *p = '\0'; 510 511 /* 512 * Ignore comments: ^[ \t]*# 513 */ 514 for (p = line; *p != '\0'; p++) 515 if (*p != ' ' && *p != '\t') 516 break; 517 if (*p == '#' || *p == '\0') { 518 is_comment = 1; 519 return(1); 520 } else 521 is_comment = 0; 522 523 if (!pw_scan(line, pw)) { 524 warnx("at line #%d", lcnt); 525fmt: errno = EFTYPE; /* XXX */ 526 error(pname); 527 } 528 529 return (1); 530} 531 532void 533cp(from, to, mode) 534 char *from, *to; 535 mode_t mode; 536{ 537 static char buf[MAXBSIZE]; 538 int from_fd, rcount, to_fd, wcount; 539 540 if ((from_fd = open(from, O_RDONLY, 0)) < 0) 541 error(from); 542 if ((to_fd = open(to, O_WRONLY|O_CREAT|O_EXCL, mode)) < 0) 543 error(to); 544 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 545 wcount = write(to_fd, buf, rcount); 546 if (rcount != wcount || wcount == -1) { 547 int sverrno = errno; 548 549 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 550 errno = sverrno; 551 error(buf); 552 } 553 } 554 if (rcount < 0) { 555 int sverrno = errno; 556 557 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 558 errno = sverrno; 559 error(buf); 560 } 561} 562 563 564void 565mv(from, to) 566 char *from, *to; 567{ 568 char buf[MAXPATHLEN]; 569 570 if (rename(from, to)) { 571 int sverrno = errno; 572 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 573 errno = sverrno; 574 error(buf); 575 } 576} 577 578void 579error(name) 580 char *name; 581{ 582 583 warn("%s", name); 584 cleanup(); 585 exit(1); 586} 587 588void 589cleanup() 590{ 591 char buf[MAXPATHLEN]; 592 593 switch(clean) { 594 case FILE_ORIG: 595 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 596 (void)unlink(buf); 597 /* FALLTHROUGH */ 598 case FILE_SECURE: 599 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 600 (void)unlink(buf); 601 /* FALLTHROUGH */ 602 case FILE_INSECURE: 603 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 604 (void)unlink(buf); 605 } 606} 607 608static void 609usage() 610{ 611 612 (void)fprintf(stderr, 613"usage: pwd_mkdb [-C] [-N] [-p] [-d <dest dir>] [-s <cachesize>] [-u <local username>] file\n"); 614 exit(1); 615} 616