pwd_mkdb.c revision 1.15
1 /* 2 * Copyright (c) 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * Portions Copyright(C) 1994, Jason Downs. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 __COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\n\ 38 The Regents of the University of California. All rights reserved.\n"); 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "from: @(#)pwd_mkdb.c 8.5 (Berkeley) 4/20/94"; 44 #else 45 __RCSID("$NetBSD: pwd_mkdb.c,v 1.15 1998/06/08 03:23:07 lukem Exp $"); 46 #endif 47 #endif /* not lint */ 48 49 #include <sys/param.h> 50 #include <sys/stat.h> 51 52 #include <db.h> 53 #include <err.h> 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <limits.h> 57 #include <pwd.h> 58 #include <signal.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 #include <util.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 70 /* pull this out of the C library. */ 71 extern const char __yp_token[]; 72 73 HASHINFO openinfo = { 74 4096, /* bsize */ 75 32, /* ffactor */ 76 256, /* nelem */ 77 2048 * 1024, /* cachesize */ 78 NULL, /* hash() */ 79 0 /* lorder */ 80 }; 81 82 static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean; 83 static struct passwd pwd; /* password structure */ 84 static char *pname; /* password file name */ 85 static char prefix[MAXPATHLEN]; 86 static char oldpwdfile[MAX(MAXPATHLEN, LINE_MAX * 2)]; 87 static char pwd_db_tmp[MAX(MAXPATHLEN, LINE_MAX * 2)]; 88 static char pwd_Sdb_tmp[MAX(MAXPATHLEN, LINE_MAX * 2)]; 89 90 void cleanup __P((void)); 91 void error __P((char *)); 92 void wr_error __P((char *)); 93 int main __P((int, char **)); 94 void mv __P((char *, char *)); 95 void rm __P((char *)); 96 int scan __P((FILE *, struct passwd *, int *)); 97 void usage __P((void)); 98 99 int 100 main(argc, argv) 101 int argc; 102 char *argv[]; 103 { 104 DB *dp, *edp; 105 DBT data, key; 106 FILE *fp, *oldfp; 107 sigset_t set; 108 int ch, cnt, len, makeold, tfd, flags; 109 char *p, *t; 110 char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024]; 111 int hasyp = 0; 112 DBT ypdata, ypkey; 113 114 oldfp = NULL; 115 strcpy(prefix, "/"); 116 makeold = 0; 117 while ((ch = getopt(argc, argv, "d:pv")) != -1) 118 switch(ch) { 119 case 'd': 120 strncpy(prefix, optarg, sizeof(prefix)); 121 prefix[sizeof(prefix)-1] = '\0'; 122 break; 123 case 'p': /* create V7 "file.orig" */ 124 makeold = 1; 125 break; 126 case 'v': /* backward compatible */ 127 break; 128 case '?': 129 default: 130 usage(); 131 } 132 argc -= optind; 133 argv += optind; 134 135 if (argc != 1) 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 (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL); 149 150 /* We don't care what the user wants. */ 151 (void)umask(0); 152 153 pname = *argv; 154 /* Open the original password file */ 155 if (!(fp = fopen(pname, "r"))) 156 error(pname); 157 158 /* Open the temporary insecure password database. */ 159 (void)snprintf(pwd_db_tmp, sizeof(pwd_db_tmp), "%s%s.tmp", prefix, 160 _PATH_MP_DB); 161 dp = dbopen(pwd_db_tmp, 162 O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 163 if (dp == NULL) 164 error(pwd_db_tmp); 165 clean = FILE_INSECURE; 166 167 /* 168 * Open file for old password file. Minor trickiness -- don't want to 169 * chance the file already existing, since someone (stupidly) might 170 * still be using this for permission checking. So, open it first and 171 * fdopen the resulting fd. The resulting file should be readable by 172 * everyone. 173 */ 174 if (makeold) { 175 (void)snprintf(oldpwdfile, sizeof(oldpwdfile), "%s.orig", 176 pname); 177 if ((tfd = open(oldpwdfile, 178 O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0) 179 error(oldpwdfile); 180 if ((oldfp = fdopen(tfd, "w")) == NULL) 181 error(oldpwdfile); 182 clean = FILE_ORIG; 183 } 184 185 /* 186 * The databases actually contain three copies of the original data. 187 * Each password file entry is converted into a rough approximation 188 * of a ``struct passwd'', with the strings placed inline. This 189 * object is then stored as the data for three separate keys. The 190 * first key * is the pw_name field prepended by the _PW_KEYBYNAME 191 * character. The second key is the pw_uid field prepended by the 192 * _PW_KEYBYUID character. The third key is the line number in the 193 * original file prepended by the _PW_KEYBYNUM character. (The special 194 * characters are prepended to ensure that the keys do not collide.) 195 * 196 * If we see something go by that looks like YP, we save a special 197 * pointer record, which if YP is enabled in the C lib, will speed 198 * things up. 199 */ 200 data.data = (u_char *)buf; 201 key.data = (u_char *)tbuf; 202 for (cnt = 1; scan(fp, &pwd, &flags); ++cnt) { 203 #define COMPACT(e) t = e; while ((*p++ = *t++)); 204 205 /* look like YP? */ 206 if((pwd.pw_name[0] == '+') || (pwd.pw_name[0] == '-')) 207 hasyp++; 208 209 /* 210 * Warn about potentially unsafe uid/gid overrides. 211 */ 212 if (pwd.pw_name[0] == '+') { 213 if ((flags & _PASSWORD_NOUID) == 0 && pwd.pw_uid == 0) 214 warnx( 215 "line %d: superuser override in YP inclusion", 216 cnt); 217 if ((flags & _PASSWORD_NOGID) == 0 && pwd.pw_gid == 0) 218 warnx("line %d: wheel override in YP inclusion", 219 cnt); 220 } 221 222 /* Create insecure data. */ 223 p = buf; 224 COMPACT(pwd.pw_name); 225 COMPACT("*"); 226 memmove(p, &pwd.pw_uid, sizeof(int)); 227 p += sizeof(int); 228 memmove(p, &pwd.pw_gid, sizeof(int)); 229 p += sizeof(int); 230 memmove(p, &pwd.pw_change, sizeof(time_t)); 231 p += sizeof(time_t); 232 COMPACT(pwd.pw_class); 233 COMPACT(pwd.pw_gecos); 234 COMPACT(pwd.pw_dir); 235 COMPACT(pwd.pw_shell); 236 memmove(p, &pwd.pw_expire, sizeof(time_t)); 237 p += sizeof(time_t); 238 memmove(p, &flags, sizeof(int)); 239 p += sizeof(int); 240 data.size = p - buf; 241 242 /* Store insecure by name. */ 243 tbuf[0] = _PW_KEYBYNAME; 244 len = strlen(pwd.pw_name); 245 memmove(tbuf + 1, pwd.pw_name, len); 246 key.size = len + 1; 247 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 248 wr_error(pwd_db_tmp); 249 250 /* Store insecure by number. */ 251 tbuf[0] = _PW_KEYBYNUM; 252 memmove(tbuf + 1, &cnt, sizeof(cnt)); 253 key.size = sizeof(cnt) + 1; 254 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 255 wr_error(pwd_db_tmp); 256 257 /* Store insecure by uid. */ 258 tbuf[0] = _PW_KEYBYUID; 259 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 260 key.size = sizeof(pwd.pw_uid) + 1; 261 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 262 wr_error(pwd_db_tmp); 263 264 /* Create original format password file entry */ 265 if (makeold) { 266 (void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n", 267 pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos, 268 pwd.pw_dir, pwd.pw_shell); 269 if (ferror(oldfp)) { 270 wr_error(oldpwdfile); 271 } 272 } 273 } 274 275 /* Store YP token, if needed. */ 276 if(hasyp) { 277 ypkey.data = (u_char *)__yp_token; 278 ypkey.size = strlen(__yp_token); 279 ypdata.data = (u_char *)NULL; 280 ypdata.size = 0; 281 282 if ((dp->put)(dp, &ypkey, &ypdata, R_NOOVERWRITE) == -1) 283 wr_error(pwd_db_tmp); 284 } 285 286 if ((dp->close)(dp) < 0) { 287 wr_error(pwd_db_tmp); 288 } 289 if (makeold) { 290 if (fflush(oldfp) == EOF) { 291 wr_error(oldpwdfile); 292 } 293 if (fclose(oldfp) == EOF) { 294 wr_error(oldpwdfile); 295 } 296 } 297 298 /* Open the temporary encrypted password database. */ 299 (void)snprintf(pwd_Sdb_tmp, sizeof(pwd_Sdb_tmp), "%s%s.tmp", prefix, 300 _PATH_SMP_DB); 301 edp = dbopen(pwd_Sdb_tmp, 302 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 303 if (!edp) 304 error(pwd_Sdb_tmp); 305 clean = FILE_SECURE; 306 307 rewind(fp); 308 for (cnt = 1; scan(fp, &pwd, &flags); ++cnt) { 309 310 /* Create secure data. */ 311 p = buf; 312 COMPACT(pwd.pw_name); 313 COMPACT(pwd.pw_passwd); 314 memmove(p, &pwd.pw_uid, sizeof(int)); 315 p += sizeof(int); 316 memmove(p, &pwd.pw_gid, sizeof(int)); 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, &flags, sizeof(int)); 327 p += sizeof(int); 328 data.size = p - buf; 329 330 /* Store secure by name. */ 331 tbuf[0] = _PW_KEYBYNAME; 332 len = strlen(pwd.pw_name); 333 memmove(tbuf + 1, pwd.pw_name, len); 334 key.size = len + 1; 335 if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 336 wr_error(pwd_Sdb_tmp); 337 338 /* Store secure by number. */ 339 tbuf[0] = _PW_KEYBYNUM; 340 memmove(tbuf + 1, &cnt, sizeof(cnt)); 341 key.size = sizeof(cnt) + 1; 342 if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 343 wr_error(pwd_Sdb_tmp); 344 345 /* Store secure by uid. */ 346 tbuf[0] = _PW_KEYBYUID; 347 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 348 key.size = sizeof(pwd.pw_uid) + 1; 349 if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 350 wr_error(pwd_Sdb_tmp); 351 } 352 353 /* Store YP token, if needed. */ 354 if(hasyp) { 355 ypkey.data = (u_char *)__yp_token; 356 ypkey.size = strlen(__yp_token); 357 ypdata.data = (u_char *)NULL; 358 ypdata.size = 0; 359 360 if((edp->put)(edp, &ypkey, &ypdata, R_NOOVERWRITE) == -1) 361 wr_error(pwd_Sdb_tmp); 362 } 363 364 if ((edp->close)(edp) < 0) { 365 wr_error(_PATH_SMP_DB); 366 } 367 368 /* Set master.passwd permissions, in case caller forgot. */ 369 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 370 if (fclose(fp) == EOF) { 371 wr_error(pname); 372 } 373 374 /* Install as the real password files. */ 375 { 376 char destination[MAXPATHLEN]; 377 378 (void)snprintf(destination, sizeof(destination), 379 "%s%s", prefix, _PATH_MP_DB); 380 mv(pwd_db_tmp, destination); 381 382 (void)snprintf(destination, sizeof(destination), 383 "%s%s", prefix, _PATH_SMP_DB); 384 mv(pwd_Sdb_tmp, destination); 385 386 if (makeold) { 387 (void)snprintf(destination, sizeof(destination), 388 "%s%s", prefix, _PATH_PASSWD); 389 mv(oldpwdfile, destination); 390 } 391 392 /* 393 * Move the master password LAST -- chpass(1), 394 * passwd(1) and vipw(8) all use flock(2) on it to 395 * block other incarnations of themselves. The rename 396 * means that everything is unlocked, as the original 397 * file can no longer be accessed. 398 */ 399 (void)snprintf(destination, sizeof(destination), 400 "%s%s", prefix, _PATH_MASTERPASSWD); 401 mv(pname, destination); 402 } 403 exit(0); 404 } 405 406 int 407 scan(fp, pw, flags) 408 FILE *fp; 409 struct passwd *pw; 410 int *flags; 411 { 412 static int lcnt; 413 static char line[LINE_MAX]; 414 char *p; 415 416 if (!fgets(line, sizeof(line), fp)) 417 return (0); 418 ++lcnt; 419 /* 420 * ``... if I swallow anything evil, put your fingers down my 421 * throat...'' 422 * -- The Who 423 */ 424 if (!(p = strchr(line, '\n'))) { 425 warnx("line too long"); 426 goto fmt; 427 428 } 429 *p = '\0'; 430 if (strcmp(line, "+") == 0) 431 strcpy(line, "+:::::::::"); /* pw_scan() can't handle "+" */ 432 *flags = 0; 433 if (!pw_scan(line, pw, flags)) { 434 warnx("at line #%d", lcnt); 435 fmt: errno = EFTYPE; /* XXX */ 436 error(pname); 437 } 438 439 return (1); 440 } 441 442 void 443 mv(from, to) 444 char *from, *to; 445 { 446 char buf[MAXPATHLEN]; 447 448 if (rename(from, to)) { 449 int sverrno = errno; 450 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 451 errno = sverrno; 452 error(buf); 453 } 454 } 455 456 void 457 wr_error(name) 458 char *name; 459 { 460 char errbuf[BUFSIZ]; 461 int sverrno = errno; 462 463 (void)snprintf(errbuf, sizeof(errbuf), 464 "attempt to write %s failed", name); 465 466 errno = sverrno; 467 error(errbuf); 468 } 469 470 void 471 error(name) 472 char *name; 473 { 474 475 warn(name); 476 cleanup(); 477 #ifdef think_about_this_a_while_longer 478 fputs("NOTE: possible inconsistencies between text files and databases\n", stderr); 479 fputs("re-run pwd_mkdb when you have fixed the problem.\n", stderr); 480 #endif 481 exit(1); 482 } 483 484 void 485 rm(victim) 486 char *victim; 487 { 488 if (unlink(victim) < 0) { 489 warn("unlink(%s)", victim); 490 } 491 } 492 493 void 494 cleanup() 495 { 496 switch(clean) { 497 case FILE_ORIG: 498 rm(oldpwdfile); 499 /* FALLTHROUGH */ 500 case FILE_SECURE: 501 rm(pwd_Sdb_tmp); 502 /* FALLTHROUGH */ 503 case FILE_INSECURE: 504 rm(pwd_db_tmp); 505 } 506 } 507 508 void 509 usage() 510 { 511 512 (void)fprintf(stderr, "usage: pwd_mkdb [-p] [-d directory] file\n"); 513 exit(1); 514 } 515
Indexes created Thu Oct 02 07:10:07 GMT 2025