pwd_mkdb.c revision 35286
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 "$Id: pwd_mkdb.c,v 1.24 1998/02/19 08:12:11 guido Exp $"; 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 Cflag; /* 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; 112 113 Cflag = 0; 114 strcpy(prefix, _PATH_PWD); 115 makeold = 0; 116 username = NULL; 117 while ((ch = getopt(argc, argv, "Cd:ps:u:v")) != -1) 118 switch(ch) { 119 case 'C': /* verify only */ 120 Cflag = 1; 121 break; 122 case 'd': 123 strncpy(prefix, optarg, sizeof prefix - 1); 124 break; 125 case 'p': /* create V7 "file.orig" */ 126 makeold = 1; 127 break; 128 case 's': /* change default cachesize */ 129 openinfo.cachesize = atoi(optarg) * 1024 * 1024; 130 break; 131 case 'u': /* only update this record */ 132 username = optarg; 133 break; 134 case 'v': /* backward compatible */ 135 break; 136 default: 137 usage(); 138 } 139 argc -= optind; 140 argv += optind; 141 142 if (argc != 1 || (username && (*username == '+' || *username == '-'))) 143 usage(); 144 145 /* 146 * This could be changed to allow the user to interrupt. 147 * Probably not worth the effort. 148 */ 149 sigemptyset(&set); 150 sigaddset(&set, SIGTSTP); 151 sigaddset(&set, SIGHUP); 152 sigaddset(&set, SIGINT); 153 sigaddset(&set, SIGQUIT); 154 sigaddset(&set, SIGTERM); 155 (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL); 156 157 /* We don't care what the user wants. */ 158 (void)umask(0); 159 160 pname = *argv; 161 /* Open the original password file */ 162 if (!(fp = fopen(pname, "r"))) 163 error(pname); 164 165 /* check only if password database is valid */ 166 if (Cflag) { 167 for (cnt = 1; scan(fp, &pwd); ++cnt); 168 exit(0); 169 } 170 171 /* Open the temporary insecure password database. */ 172 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 173 (void)snprintf(sbuf, sizeof(sbuf), "%s/%s.tmp", prefix, _SMP_DB); 174 if (username) { 175 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 176 (void)snprintf(sbuf2, sizeof(sbuf2), "%s/%s", prefix, _SMP_DB); 177 178 clean = FILE_INSECURE; 179 cp(buf2, buf, PERM_INSECURE); 180 dp = dbopen(buf, 181 O_RDWR|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 182 if (dp == NULL) 183 error(buf); 184 185 clean = FILE_SECURE; 186 cp(sbuf2, sbuf, PERM_SECURE); 187 sdp = dbopen(sbuf, 188 O_RDWR|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 189 if (sdp == NULL) 190 error(sbuf); 191 192 /* 193 * Do some trouble to check if we should store this users 194 * uid. Don't use getpwnam/getpwuid as that interferes 195 * with NIS. 196 */ 197 pw_db = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL); 198 if (!pw_db) 199 error(_MP_DB); 200 buf[0] = _PW_KEYBYNAME; 201 len = strlen(username); 202 203 /* Only check that username fits in buffer */ 204 memmove(buf + 1, username, MIN(len, sizeof(buf) - 1)); 205 key.data = (u_char *)buf; 206 key.size = len + 1; 207 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) { 208 p = (char *)data.data; 209 210 /* jump over pw_name and pw_passwd, to get to pw_uid */ 211 while (*p++) 212 ; 213 while (*p++) 214 ; 215 216 buf[0] = _PW_KEYBYUID; 217 memmove(buf + 1, p, sizeof(int)); 218 key.data = (u_char *)buf; 219 key.size = sizeof(int) + 1; 220 221 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) { 222 /* First field of data.data holds pw_pwname */ 223 if (!strcmp(data.data, username)) 224 methoduid = 0; 225 else 226 methoduid = R_NOOVERWRITE; 227 } else { 228 methoduid = R_NOOVERWRITE; 229 } 230 } else { 231 methoduid = R_NOOVERWRITE; 232 } 233 if ((pw_db->close)(pw_db)) 234 error("close pw_db"); 235 method = 0; 236 } else { 237 dp = dbopen(buf, 238 O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 239 if (dp == NULL) 240 error(buf); 241 clean = FILE_INSECURE; 242 243 sdp = dbopen(sbuf, 244 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 245 if (sdp == NULL) 246 error(sbuf); 247 clean = FILE_SECURE; 248 249 method = R_NOOVERWRITE; 250 methoduid = R_NOOVERWRITE; 251 } 252 253 /* 254 * Open file for old password file. Minor trickiness -- don't want to 255 * chance the file already existing, since someone (stupidly) might 256 * still be using this for permission checking. So, open it first and 257 * fdopen the resulting fd. The resulting file should be readable by 258 * everyone. 259 */ 260 if (makeold) { 261 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 262 if ((tfd = open(buf, 263 O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0) 264 error(buf); 265 if ((oldfp = fdopen(tfd, "w")) == NULL) 266 error(buf); 267 clean = FILE_ORIG; 268 } 269 270 /* 271 * The databases actually contain three copies of the original data. 272 * Each password file entry is converted into a rough approximation 273 * of a ``struct passwd'', with the strings placed inline. This 274 * object is then stored as the data for three separate keys. The 275 * first key * is the pw_name field prepended by the _PW_KEYBYNAME 276 * character. The second key is the pw_uid field prepended by the 277 * _PW_KEYBYUID character. The third key is the line number in the 278 * original file prepended by the _PW_KEYBYNUM character. (The special 279 * characters are prepended to ensure that the keys do not collide.) 280 */ 281 ypcnt = 1; 282 data.data = (u_char *)buf; 283 sdata.data = (u_char *)sbuf; 284 key.data = (u_char *)tbuf; 285 for (cnt = 1; scan(fp, &pwd); ++cnt) { 286 if (!Cflag && 287 (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-')) 288 yp_enabled = 1; 289#define COMPACT(e) t = e; while ((*p++ = *t++)); 290 if (!Cflag && 291 (!username || (strcmp(username, pwd.pw_name) == 0))) { 292 /* Create insecure data. */ 293 p = buf; 294 COMPACT(pwd.pw_name); 295 COMPACT("*"); 296 memmove(p, &pwd.pw_uid, sizeof(int)); 297 p += sizeof(int); 298 memmove(p, &pwd.pw_gid, sizeof(int)); 299 p += sizeof(int); 300 memmove(p, &pwd.pw_change, sizeof(time_t)); 301 p += sizeof(time_t); 302 COMPACT(pwd.pw_class); 303 COMPACT(pwd.pw_gecos); 304 COMPACT(pwd.pw_dir); 305 COMPACT(pwd.pw_shell); 306 memmove(p, &pwd.pw_expire, sizeof(time_t)); 307 p += sizeof(time_t); 308 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 309 p += sizeof pwd.pw_fields; 310 data.size = p - buf; 311 312 /* Create secure data. */ 313 p = sbuf; 314 COMPACT(pwd.pw_name); 315 COMPACT(pwd.pw_passwd); 316 memmove(p, &pwd.pw_uid, sizeof(int)); 317 p += sizeof(int); 318 memmove(p, &pwd.pw_gid, sizeof(int)); 319 p += sizeof(int); 320 memmove(p, &pwd.pw_change, sizeof(time_t)); 321 p += sizeof(time_t); 322 COMPACT(pwd.pw_class); 323 COMPACT(pwd.pw_gecos); 324 COMPACT(pwd.pw_dir); 325 COMPACT(pwd.pw_shell); 326 memmove(p, &pwd.pw_expire, sizeof(time_t)); 327 p += sizeof(time_t); 328 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 329 p += sizeof pwd.pw_fields; 330 sdata.size = p - sbuf; 331 332 /* Store insecure by name. */ 333 tbuf[0] = _PW_KEYBYNAME; 334 len = strlen(pwd.pw_name); 335 memmove(tbuf + 1, pwd.pw_name, len); 336 key.size = len + 1; 337 if ((dp->put)(dp, &key, &data, method) == -1) 338 error("put"); 339 340 /* Store insecure by number. */ 341 tbuf[0] = _PW_KEYBYNUM; 342 memmove(tbuf + 1, &cnt, sizeof(cnt)); 343 key.size = sizeof(cnt) + 1; 344 if ((dp->put)(dp, &key, &data, method) == -1) 345 error("put"); 346 347 /* Store insecure by uid. */ 348 tbuf[0] = _PW_KEYBYUID; 349 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 350 key.size = sizeof(pwd.pw_uid) + 1; 351 if ((dp->put)(dp, &key, &data, methoduid) == -1) 352 error("put"); 353 354 /* Store secure by name. */ 355 tbuf[0] = _PW_KEYBYNAME; 356 len = strlen(pwd.pw_name); 357 memmove(tbuf + 1, pwd.pw_name, len); 358 key.size = len + 1; 359 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 360 error("put"); 361 362 /* Store secure by number. */ 363 tbuf[0] = _PW_KEYBYNUM; 364 memmove(tbuf + 1, &cnt, sizeof(cnt)); 365 key.size = sizeof(cnt) + 1; 366 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 367 error("put"); 368 369 /* Store secure by uid. */ 370 tbuf[0] = _PW_KEYBYUID; 371 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 372 key.size = sizeof(pwd.pw_uid) + 1; 373 if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1) 374 error("put"); 375 376 /* Store insecure and secure special plus and special minus */ 377 if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') { 378 tbuf[0] = _PW_KEYYPBYNUM; 379 memmove(tbuf + 1, &ypcnt, sizeof(cnt)); 380 ypcnt++; 381 key.size = sizeof(cnt) + 1; 382 if ((dp->put)(dp, &key, &data, method) == -1) 383 error("put"); 384 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 385 error("put"); 386 } 387 } 388 /* Create original format password file entry */ 389 if (Cflag && makeold){ /* copy comments */ 390 if (fprintf(oldfp, "%s\n", line) < 0) 391 error("write old"); 392 } else if (makeold) { 393 char uidstr[20]; 394 char gidstr[20]; 395 396 snprintf(uidstr, sizeof(uidstr), "%d", pwd.pw_uid); 397 snprintf(gidstr, sizeof(gidstr), "%d", pwd.pw_gid); 398 399 if (fprintf(oldfp, "%s:*:%s:%s:%s:%s:%s\n", 400 pwd.pw_name, pwd.pw_fields & _PWF_UID ? uidstr : "", 401 pwd.pw_fields & _PWF_GID ? gidstr : "", 402 pwd.pw_gecos, pwd.pw_dir, pwd.pw_shell) < 0) 403 error("write old"); 404 } 405 } 406 /* If YP enabled, set flag. */ 407 if (yp_enabled) { 408 buf[0] = yp_enabled + 2; 409 data.size = 1; 410 tbuf[0] = _PW_KEYYPENABLED; 411 key.size = 1; 412 if ((dp->put)(dp, &key, &data, method) == -1) 413 error("put"); 414 if ((sdp->put)(sdp, &key, &data, method) == -1) 415 error("put"); 416 } 417 418 if ((dp->close)(dp) == -1) 419 error("close"); 420 if ((sdp->close)(sdp) == -1) 421 error("close"); 422 if (makeold) { 423 (void)fflush(oldfp); 424 if (fclose(oldfp) == EOF) 425 error("close old"); 426 } 427 428 /* Set master.passwd permissions, in case caller forgot. */ 429 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 430 if (fclose(fp) == EOF) 431 error("close fp"); 432 433 /* Install as the real password files. */ 434 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 435 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 436 mv(buf, buf2); 437 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 438 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB); 439 mv(buf, buf2); 440 if (makeold) { 441 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD); 442 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 443 mv(buf, buf2); 444 } 445 /* 446 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 447 * all use flock(2) on it to block other incarnations of themselves. 448 * The rename means that everything is unlocked, as the original file 449 * can no longer be accessed. 450 */ 451 (void)snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD); 452 mv(pname, buf); 453 exit(0); 454} 455 456int 457scan(fp, pw) 458 FILE *fp; 459 struct passwd *pw; 460{ 461 static int lcnt; 462 char *p; 463 464 if (!fgets(line, sizeof(line), fp)) 465 return (0); 466 ++lcnt; 467 /* 468 * ``... if I swallow anything evil, put your fingers down my 469 * throat...'' 470 * -- The Who 471 */ 472 if (!(p = strchr(line, '\n'))) { 473 warnx("line too long"); 474 goto fmt; 475 476 } 477 *p = '\0'; 478 479#ifdef PASSWD_IGNORE_COMMENTS 480 /* 481 * Ignore comments: ^[ \t]*# 482 */ 483 for (p = line; *p != '\0'; p++) 484 if (*p != ' ' && *p != '\t') 485 break; 486 if (*p == '#' || *p == '\0') { 487 Cflag = 1; 488 return(1); 489 } else 490 Cflag = 0; 491#endif 492 493 if (!pw_scan(line, pw)) { 494 warnx("at line #%d", lcnt); 495fmt: errno = EFTYPE; /* XXX */ 496 error(pname); 497 } 498 499 return (1); 500} 501 502void 503cp(from, to, mode) 504 char *from, *to; 505 mode_t mode; 506{ 507 static char buf[MAXBSIZE]; 508 int from_fd, rcount, to_fd, wcount; 509 510 if ((from_fd = open(from, O_RDONLY, 0)) < 0) 511 error(from); 512 if ((to_fd = open(to, O_WRONLY|O_CREAT|O_EXCL, mode)) < 0) 513 error(to); 514 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 515 wcount = write(to_fd, buf, rcount); 516 if (rcount != wcount || wcount == -1) { 517 int sverrno = errno; 518 519 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 520 errno = sverrno; 521 error(buf); 522 } 523 } 524 if (rcount < 0) { 525 int sverrno = errno; 526 527 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 528 errno = sverrno; 529 error(buf); 530 } 531} 532 533 534void 535mv(from, to) 536 char *from, *to; 537{ 538 char buf[MAXPATHLEN]; 539 540 if (rename(from, to)) { 541 int sverrno = errno; 542 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 543 errno = sverrno; 544 error(buf); 545 } 546} 547 548void 549error(name) 550 char *name; 551{ 552 553 warn("%s", name); 554 cleanup(); 555 exit(1); 556} 557 558void 559cleanup() 560{ 561 char buf[MAXPATHLEN]; 562 563 switch(clean) { 564 case FILE_ORIG: 565 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 566 (void)unlink(buf); 567 /* FALLTHROUGH */ 568 case FILE_SECURE: 569 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 570 (void)unlink(buf); 571 /* FALLTHROUGH */ 572 case FILE_INSECURE: 573 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 574 (void)unlink(buf); 575 } 576} 577 578static void 579usage() 580{ 581 582 (void)fprintf(stderr, 583"usage: pwd_mkdb [-c] [-p] [-d <dest dir>] [-u <local username>] file\n"); 584 exit(1); 585} 586