pwd_mkdb.c revision 1.16
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 1.16 1998/07/27 00:52:02 mycroft 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; 110 const char *t; 111 char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024]; 112 int hasyp = 0; 113 DBT ypdata, ypkey; 114 115 oldfp = NULL; 116 strcpy(prefix, "/"); 117 makeold = 0; 118 while ((ch = getopt(argc, argv, "d:pv")) != -1) 119 switch(ch) { 120 case 'd': 121 strncpy(prefix, optarg, sizeof(prefix)); 122 prefix[sizeof(prefix)-1] = '\0'; 123 break; 124 case 'p': /* create V7 "file.orig" */ 125 makeold = 1; 126 break; 127 case 'v': /* backward compatible */ 128 break; 129 case '?': 130 default: 131 usage(); 132 } 133 argc -= optind; 134 argv += optind; 135 136 if (argc != 1) 137 usage(); 138 139 /* 140 * This could be changed to allow the user to interrupt. 141 * Probably not worth the effort. 142 */ 143 sigemptyset(&set); 144 sigaddset(&set, SIGTSTP); 145 sigaddset(&set, SIGHUP); 146 sigaddset(&set, SIGINT); 147 sigaddset(&set, SIGQUIT); 148 sigaddset(&set, SIGTERM); 149 (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL); 150 151 /* We don't care what the user wants. */ 152 (void)umask(0); 153 154 pname = *argv; 155 /* Open the original password file */ 156 if (!(fp = fopen(pname, "r"))) 157 error(pname); 158 159 /* Open the temporary insecure password database. */ 160 (void)snprintf(pwd_db_tmp, sizeof(pwd_db_tmp), "%s%s.tmp", prefix, 161 _PATH_MP_DB); 162 dp = dbopen(pwd_db_tmp, 163 O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 164 if (dp == NULL) 165 error(pwd_db_tmp); 166 clean = FILE_INSECURE; 167 168 /* 169 * Open file for old password file. Minor trickiness -- don't want to 170 * chance the file already existing, since someone (stupidly) might 171 * still be using this for permission checking. So, open it first and 172 * fdopen the resulting fd. The resulting file should be readable by 173 * everyone. 174 */ 175 if (makeold) { 176 (void)snprintf(oldpwdfile, sizeof(oldpwdfile), "%s.orig", 177 pname); 178 if ((tfd = open(oldpwdfile, 179 O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0) 180 error(oldpwdfile); 181 if ((oldfp = fdopen(tfd, "w")) == NULL) 182 error(oldpwdfile); 183 clean = FILE_ORIG; 184 } 185 186 /* 187 * The databases actually contain three copies of the original data. 188 * Each password file entry is converted into a rough approximation 189 * of a ``struct passwd'', with the strings placed inline. This 190 * object is then stored as the data for three separate keys. The 191 * first key * is the pw_name field prepended by the _PW_KEYBYNAME 192 * character. The second key is the pw_uid field prepended by the 193 * _PW_KEYBYUID character. The third key is the line number in the 194 * original file prepended by the _PW_KEYBYNUM character. (The special 195 * characters are prepended to ensure that the keys do not collide.) 196 * 197 * If we see something go by that looks like YP, we save a special 198 * pointer record, which if YP is enabled in the C lib, will speed 199 * things up. 200 */ 201 data.data = (u_char *)buf; 202 key.data = (u_char *)tbuf; 203 for (cnt = 1; scan(fp, &pwd, &flags); ++cnt) { 204 #define COMPACT(e) t = e; while ((*p++ = *t++)); 205 206 /* look like YP? */ 207 if((pwd.pw_name[0] == '+') || (pwd.pw_name[0] == '-')) 208 hasyp++; 209 210 /* 211 * Warn about potentially unsafe uid/gid overrides. 212 */ 213 if (pwd.pw_name[0] == '+') { 214 if ((flags & _PASSWORD_NOUID) == 0 && pwd.pw_uid == 0) 215 warnx( 216 "line %d: superuser override in YP inclusion", 217 cnt); 218 if ((flags & _PASSWORD_NOGID) == 0 && pwd.pw_gid == 0) 219 warnx("line %d: wheel override in YP inclusion", 220 cnt); 221 } 222 223 /* Create insecure data. */ 224 p = buf; 225 COMPACT(pwd.pw_name); 226 COMPACT("*"); 227 memmove(p, &pwd.pw_uid, sizeof(int)); 228 p += sizeof(int); 229 memmove(p, &pwd.pw_gid, sizeof(int)); 230 p += sizeof(int); 231 memmove(p, &pwd.pw_change, sizeof(time_t)); 232 p += sizeof(time_t); 233 COMPACT(pwd.pw_class); 234 COMPACT(pwd.pw_gecos); 235 COMPACT(pwd.pw_dir); 236 COMPACT(pwd.pw_shell); 237 memmove(p, &pwd.pw_expire, sizeof(time_t)); 238 p += sizeof(time_t); 239 memmove(p, &flags, sizeof(int)); 240 p += sizeof(int); 241 data.size = p - buf; 242 243 /* Store insecure by name. */ 244 tbuf[0] = _PW_KEYBYNAME; 245 len = strlen(pwd.pw_name); 246 memmove(tbuf + 1, pwd.pw_name, len); 247 key.size = len + 1; 248 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 249 wr_error(pwd_db_tmp); 250 251 /* Store insecure by number. */ 252 tbuf[0] = _PW_KEYBYNUM; 253 memmove(tbuf + 1, &cnt, sizeof(cnt)); 254 key.size = sizeof(cnt) + 1; 255 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 256 wr_error(pwd_db_tmp); 257 258 /* Store insecure by uid. */ 259 tbuf[0] = _PW_KEYBYUID; 260 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 261 key.size = sizeof(pwd.pw_uid) + 1; 262 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 263 wr_error(pwd_db_tmp); 264 265 /* Create original format password file entry */ 266 if (makeold) { 267 (void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n", 268 pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos, 269 pwd.pw_dir, pwd.pw_shell); 270 if (ferror(oldfp)) { 271 wr_error(oldpwdfile); 272 } 273 } 274 } 275 276 /* Store YP token, if needed. */ 277 if(hasyp) { 278 ypkey.data = (u_char *)__yp_token; 279 ypkey.size = strlen(__yp_token); 280 ypdata.data = (u_char *)NULL; 281 ypdata.size = 0; 282 283 if ((dp->put)(dp, &ypkey, &ypdata, R_NOOVERWRITE) == -1) 284 wr_error(pwd_db_tmp); 285 } 286 287 if ((dp->close)(dp) < 0) { 288 wr_error(pwd_db_tmp); 289 } 290 if (makeold) { 291 if (fflush(oldfp) == EOF) { 292 wr_error(oldpwdfile); 293 } 294 if (fclose(oldfp) == EOF) { 295 wr_error(oldpwdfile); 296 } 297 } 298 299 /* Open the temporary encrypted password database. */ 300 (void)snprintf(pwd_Sdb_tmp, sizeof(pwd_Sdb_tmp), "%s%s.tmp", prefix, 301 _PATH_SMP_DB); 302 edp = dbopen(pwd_Sdb_tmp, 303 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 304 if (!edp) 305 error(pwd_Sdb_tmp); 306 clean = FILE_SECURE; 307 308 rewind(fp); 309 for (cnt = 1; scan(fp, &pwd, &flags); ++cnt) { 310 311 /* Create secure data. */ 312 p = buf; 313 COMPACT(pwd.pw_name); 314 COMPACT(pwd.pw_passwd); 315 memmove(p, &pwd.pw_uid, sizeof(int)); 316 p += sizeof(int); 317 memmove(p, &pwd.pw_gid, sizeof(int)); 318 p += sizeof(int); 319 memmove(p, &pwd.pw_change, sizeof(time_t)); 320 p += sizeof(time_t); 321 COMPACT(pwd.pw_class); 322 COMPACT(pwd.pw_gecos); 323 COMPACT(pwd.pw_dir); 324 COMPACT(pwd.pw_shell); 325 memmove(p, &pwd.pw_expire, sizeof(time_t)); 326 p += sizeof(time_t); 327 memmove(p, &flags, sizeof(int)); 328 p += sizeof(int); 329 data.size = p - buf; 330 331 /* Store secure by name. */ 332 tbuf[0] = _PW_KEYBYNAME; 333 len = strlen(pwd.pw_name); 334 memmove(tbuf + 1, pwd.pw_name, len); 335 key.size = len + 1; 336 if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 337 wr_error(pwd_Sdb_tmp); 338 339 /* Store secure by number. */ 340 tbuf[0] = _PW_KEYBYNUM; 341 memmove(tbuf + 1, &cnt, sizeof(cnt)); 342 key.size = sizeof(cnt) + 1; 343 if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 344 wr_error(pwd_Sdb_tmp); 345 346 /* Store secure by uid. */ 347 tbuf[0] = _PW_KEYBYUID; 348 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 349 key.size = sizeof(pwd.pw_uid) + 1; 350 if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 351 wr_error(pwd_Sdb_tmp); 352 } 353 354 /* Store YP token, if needed. */ 355 if(hasyp) { 356 ypkey.data = (u_char *)__yp_token; 357 ypkey.size = strlen(__yp_token); 358 ypdata.data = (u_char *)NULL; 359 ypdata.size = 0; 360 361 if((edp->put)(edp, &ypkey, &ypdata, R_NOOVERWRITE) == -1) 362 wr_error(pwd_Sdb_tmp); 363 } 364 365 if ((edp->close)(edp) < 0) { 366 wr_error(_PATH_SMP_DB); 367 } 368 369 /* Set master.passwd permissions, in case caller forgot. */ 370 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 371 if (fclose(fp) == EOF) { 372 wr_error(pname); 373 } 374 375 /* Install as the real password files. */ 376 { 377 char destination[MAXPATHLEN]; 378 379 (void)snprintf(destination, sizeof(destination), 380 "%s%s", prefix, _PATH_MP_DB); 381 mv(pwd_db_tmp, destination); 382 383 (void)snprintf(destination, sizeof(destination), 384 "%s%s", prefix, _PATH_SMP_DB); 385 mv(pwd_Sdb_tmp, destination); 386 387 if (makeold) { 388 (void)snprintf(destination, sizeof(destination), 389 "%s%s", prefix, _PATH_PASSWD); 390 mv(oldpwdfile, destination); 391 } 392 393 /* 394 * Move the master password LAST -- chpass(1), 395 * passwd(1) and vipw(8) all use flock(2) on it to 396 * block other incarnations of themselves. The rename 397 * means that everything is unlocked, as the original 398 * file can no longer be accessed. 399 */ 400 (void)snprintf(destination, sizeof(destination), 401 "%s%s", prefix, _PATH_MASTERPASSWD); 402 mv(pname, destination); 403 } 404 exit(0); 405 } 406 407 int 408 scan(fp, pw, flags) 409 FILE *fp; 410 struct passwd *pw; 411 int *flags; 412 { 413 static int lcnt; 414 static char line[LINE_MAX]; 415 char *p; 416 417 if (!fgets(line, sizeof(line), fp)) 418 return (0); 419 ++lcnt; 420 /* 421 * ``... if I swallow anything evil, put your fingers down my 422 * throat...'' 423 * -- The Who 424 */ 425 if (!(p = strchr(line, '\n'))) { 426 warnx("line too long"); 427 goto fmt; 428 429 } 430 *p = '\0'; 431 if (strcmp(line, "+") == 0) 432 strcpy(line, "+:::::::::"); /* pw_scan() can't handle "+" */ 433 *flags = 0; 434 if (!pw_scan(line, pw, flags)) { 435 warnx("at line #%d", lcnt); 436 fmt: errno = EFTYPE; /* XXX */ 437 error(pname); 438 } 439 440 return (1); 441 } 442 443 void 444 mv(from, to) 445 char *from, *to; 446 { 447 char buf[MAXPATHLEN]; 448 449 if (rename(from, to)) { 450 int sverrno = errno; 451 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 452 errno = sverrno; 453 error(buf); 454 } 455 } 456 457 void 458 wr_error(name) 459 char *name; 460 { 461 char errbuf[BUFSIZ]; 462 int sverrno = errno; 463 464 (void)snprintf(errbuf, sizeof(errbuf), 465 "attempt to write %s failed", name); 466 467 errno = sverrno; 468 error(errbuf); 469 } 470 471 void 472 error(name) 473 char *name; 474 { 475 476 warn(name); 477 cleanup(); 478 #ifdef think_about_this_a_while_longer 479 fputs("NOTE: possible inconsistencies between text files and databases\n", stderr); 480 fputs("re-run pwd_mkdb when you have fixed the problem.\n", stderr); 481 #endif 482 exit(1); 483 } 484 485 void 486 rm(victim) 487 char *victim; 488 { 489 if (unlink(victim) < 0) { 490 warn("unlink(%s)", victim); 491 } 492 } 493 494 void 495 cleanup() 496 { 497 switch(clean) { 498 case FILE_ORIG: 499 rm(oldpwdfile); 500 /* FALLTHROUGH */ 501 case FILE_SECURE: 502 rm(pwd_Sdb_tmp); 503 /* FALLTHROUGH */ 504 case FILE_INSECURE: 505 rm(pwd_db_tmp); 506 } 507 } 508 509 void 510 usage() 511 { 512 513 (void)fprintf(stderr, "usage: pwd_mkdb [-p] [-d directory] file\n"); 514 exit(1); 515 } 516
Indexes created Wed Oct 01 15:09:59 GMT 2025