pwd_mkdb.c revision 1.11
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 1.11 1998/04/13 23:12:45 fair 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("line %d: superuser override in YP inclusion", cnt); 215 if ((flags & _PASSWORD_NOGID) == 0 && pwd.pw_gid == 0) 216 warnx("line %d: wheel override in YP inclusion", cnt); 217 } 218 219 /* Create insecure data. */ 220 p = buf; 221 COMPACT(pwd.pw_name); 222 COMPACT("*"); 223 memmove(p, &pwd.pw_uid, sizeof(int)); 224 p += sizeof(int); 225 memmove(p, &pwd.pw_gid, sizeof(int)); 226 p += sizeof(int); 227 memmove(p, &pwd.pw_change, sizeof(time_t)); 228 p += sizeof(time_t); 229 COMPACT(pwd.pw_class); 230 COMPACT(pwd.pw_gecos); 231 COMPACT(pwd.pw_dir); 232 COMPACT(pwd.pw_shell); 233 memmove(p, &pwd.pw_expire, sizeof(time_t)); 234 p += sizeof(time_t); 235 memmove(p, &flags, sizeof(int)); 236 p += sizeof(int); 237 data.size = p - buf; 238 239 /* Store insecure by name. */ 240 tbuf[0] = _PW_KEYBYNAME; 241 len = strlen(pwd.pw_name); 242 memmove(tbuf + 1, pwd.pw_name, len); 243 key.size = len + 1; 244 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 245 wr_error(pwd_db_tmp); 246 247 /* Store insecure by number. */ 248 tbuf[0] = _PW_KEYBYNUM; 249 memmove(tbuf + 1, &cnt, sizeof(cnt)); 250 key.size = sizeof(cnt) + 1; 251 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 252 wr_error(pwd_db_tmp); 253 254 /* Store insecure by uid. */ 255 tbuf[0] = _PW_KEYBYUID; 256 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 257 key.size = sizeof(pwd.pw_uid) + 1; 258 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 259 wr_error(pwd_db_tmp); 260 261 /* Create original format password file entry */ 262 if (makeold) { 263 (void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n", 264 pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos, 265 pwd.pw_dir, pwd.pw_shell); 266 if (ferror(oldfp)) { 267 wr_error(oldpwdfile); 268 } 269 } 270 } 271 272 /* Store YP token, if needed. */ 273 if(hasyp) { 274 ypkey.data = (u_char *)__yp_token; 275 ypkey.size = strlen(__yp_token); 276 ypdata.data = (u_char *)NULL; 277 ypdata.size = 0; 278 279 if ((dp->put)(dp, &ypkey, &ypdata, R_NOOVERWRITE) == -1) 280 wr_error(pwd_db_tmp); 281 } 282 283 if ((dp->close)(dp) < 0) { 284 wr_error(pwd_db_tmp); 285 } 286 if (makeold) { 287 if (fflush(oldfp) == EOF) { 288 wr_error(oldpwdfile); 289 } 290 if (fclose(oldfp) == EOF) { 291 wr_error(oldpwdfile); 292 } 293 } 294 295 /* Open the temporary encrypted password database. */ 296 (void)snprintf(pwd_Sdb_tmp, sizeof(pwd_Sdb_tmp), "%s%s.tmp", prefix, 297 _PATH_SMP_DB); 298 edp = dbopen(pwd_Sdb_tmp, 299 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 300 if (!edp) 301 error(pwd_Sdb_tmp); 302 clean = FILE_SECURE; 303 304 rewind(fp); 305 for (cnt = 1; scan(fp, &pwd, &flags); ++cnt) { 306 307 /* Create secure data. */ 308 p = buf; 309 COMPACT(pwd.pw_name); 310 COMPACT(pwd.pw_passwd); 311 memmove(p, &pwd.pw_uid, sizeof(int)); 312 p += sizeof(int); 313 memmove(p, &pwd.pw_gid, sizeof(int)); 314 p += sizeof(int); 315 memmove(p, &pwd.pw_change, sizeof(time_t)); 316 p += sizeof(time_t); 317 COMPACT(pwd.pw_class); 318 COMPACT(pwd.pw_gecos); 319 COMPACT(pwd.pw_dir); 320 COMPACT(pwd.pw_shell); 321 memmove(p, &pwd.pw_expire, sizeof(time_t)); 322 p += sizeof(time_t); 323 memmove(p, &flags, sizeof(int)); 324 p += sizeof(int); 325 data.size = p - buf; 326 327 /* Store secure by name. */ 328 tbuf[0] = _PW_KEYBYNAME; 329 len = strlen(pwd.pw_name); 330 memmove(tbuf + 1, pwd.pw_name, len); 331 key.size = len + 1; 332 if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 333 error("put"); 334 335 /* Store secure by number. */ 336 tbuf[0] = _PW_KEYBYNUM; 337 memmove(tbuf + 1, &cnt, sizeof(cnt)); 338 key.size = sizeof(cnt) + 1; 339 if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 340 error("put"); 341 342 /* Store secure by uid. */ 343 tbuf[0] = _PW_KEYBYUID; 344 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 345 key.size = sizeof(pwd.pw_uid) + 1; 346 if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 347 error("put"); 348 } 349 350 /* Store YP token, if needed. */ 351 if(hasyp) { 352 ypkey.data = (u_char *)__yp_token; 353 ypkey.size = strlen(__yp_token); 354 ypdata.data = (u_char *)NULL; 355 ypdata.size = 0; 356 357 if((edp->put)(edp, &ypkey, &ypdata, R_NOOVERWRITE) == -1) 358 error("put"); 359 } 360 361 if ((edp->close)(edp) < 0) { 362 wr_error(_PATH_SMP_DB); 363 } 364 365 /* Set master.passwd permissions, in case caller forgot. */ 366 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 367 if (fclose(fp) == EOF) { 368 wr_error(pname); 369 } 370 371 /* Install as the real password files. */ 372 { 373 char destination[MAXPATHLEN]; 374 375 (void)snprintf(destination, sizeof(destination), 376 "%s%s", prefix, _PATH_MP_DB); 377 mv(pwd_db_tmp, destination); 378 379 (void)snprintf(destination, sizeof(destination), 380 "%s%s", prefix, _PATH_SMP_DB); 381 mv(pwd_Sdb_tmp, destination); 382 383 if (makeold) { 384 (void)snprintf(destination, sizeof(destination), 385 "%s%s", prefix, _PATH_PASSWD); 386 mv(oldpwdfile, destination); 387 } 388 389 /* 390 * Move the master password LAST -- chpass(1), 391 * passwd(1) and vipw(8) all use flock(2) on it to 392 * block other incarnations of themselves. The rename 393 * means that everything is unlocked, as the original 394 * file can no longer be accessed. 395 */ 396 (void)snprintf(destination, sizeof(destination), 397 "%s%s", prefix, _PATH_MASTERPASSWD); 398 mv(pname, destination); 399 } 400 exit(0); 401 } 402 403 int 404 scan(fp, pw, flags) 405 FILE *fp; 406 struct passwd *pw; 407 int *flags; 408 { 409 static int lcnt; 410 static char line[LINE_MAX]; 411 char *p; 412 413 if (!fgets(line, sizeof(line), fp)) 414 return (0); 415 ++lcnt; 416 /* 417 * ``... if I swallow anything evil, put your fingers down my 418 * throat...'' 419 * -- The Who 420 */ 421 if (!(p = strchr(line, '\n'))) { 422 warnx("line too long"); 423 goto fmt; 424 425 } 426 *p = '\0'; 427 if (!pw_scan(line, pw, flags)) { 428 warnx("at line #%d", lcnt); 429 fmt: errno = EFTYPE; /* XXX */ 430 error(pname); 431 } 432 433 return (1); 434 } 435 436 void 437 mv(from, to) 438 char *from, *to; 439 { 440 char buf[MAXPATHLEN]; 441 442 if (rename(from, to)) { 443 int sverrno = errno; 444 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 445 errno = sverrno; 446 error(buf); 447 } 448 } 449 450 void 451 wr_error(name) 452 char *name; 453 { 454 char errbuf[BUFSIZ]; 455 int sverrno = errno; 456 457 (void)snprintf(errbuf, sizeof(errbuf), 458 "attempt to write %s failed", name); 459 460 errno = sverrno; 461 error(errbuf); 462 } 463 464 void 465 error(name) 466 char *name; 467 { 468 469 warn(name); 470 cleanup(); 471 #ifdef think_about_this_a_while_longer 472 fputs("NOTE: possible inconsistencies between text files and databases\n", stderr); 473 fputs("re-run pwd_mkdb when you have fixed the problem.\n", stderr); 474 #endif 475 exit(1); 476 } 477 478 void 479 rm(victim) 480 char *victim; 481 { 482 if (unlink(victim) < 0) { 483 warn("unlink(%s)", victim); 484 } 485 } 486 487 void 488 cleanup() 489 { 490 char buf[MAXPATHLEN]; 491 492 switch(clean) { 493 case FILE_ORIG: 494 rm(oldpwdfile); 495 /* FALLTHROUGH */ 496 case FILE_SECURE: 497 rm(pwd_Sdb_tmp); 498 /* FALLTHROUGH */ 499 case FILE_INSECURE: 500 rm(pwd_db_tmp); 501 } 502 } 503 504 void 505 usage() 506 { 507 508 (void)fprintf(stderr, "usage: pwd_mkdb [-p] [-d directory] file\n"); 509 exit(1); 510 } 511
Indexes created Wed Oct 01 13:09:50 GMT 2025