pwd_mkdb.c revision 1.9
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 #ifndef lint 36 static char copyright[] = 37 "@(#) 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 /*static char sccsid[] = "from: @(#)pwd_mkdb.c 8.5 (Berkeley) 4/20/94";*/ 43 static char *rcsid = "$Id: pwd_mkdb.c,v 1.9 1996/11/24 21:13:27 thorpej Exp $"; 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/stat.h> 48 49 #include <db.h> 50 #include <err.h> 51 #include <errno.h> 52 #include <fcntl.h> 53 #include <limits.h> 54 #include <pwd.h> 55 #include <signal.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 #include <util.h> 61 62 #define INSECURE 1 63 #define SECURE 2 64 #define PERM_INSECURE (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) 65 #define PERM_SECURE (S_IRUSR|S_IWUSR) 66 67 /* pull this out of the C library. */ 68 extern const char __yp_token[]; 69 70 HASHINFO openinfo = { 71 4096, /* bsize */ 72 32, /* ffactor */ 73 256, /* nelem */ 74 2048 * 1024, /* cachesize */ 75 NULL, /* hash() */ 76 0 /* lorder */ 77 }; 78 79 static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean; 80 static struct passwd pwd; /* password structure */ 81 static char *pname; /* password file name */ 82 static char prefix[MAXPATHLEN]; 83 84 void cleanup __P((void)); 85 void error __P((char *)); 86 void mv __P((char *, char *)); 87 int scan __P((FILE *, struct passwd *, int *)); 88 void usage __P((void)); 89 90 int 91 main(argc, argv) 92 int argc; 93 char *argv[]; 94 { 95 DB *dp, *edp; 96 DBT data, key; 97 FILE *fp, *oldfp; 98 sigset_t set; 99 int ch, cnt, len, makeold, tfd, flags; 100 char *p, *t; 101 char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], buf2[MAXPATHLEN], tbuf[1024]; 102 int hasyp = 0; 103 DBT ypdata, ypkey; 104 105 strcpy(prefix, "/"); 106 makeold = 0; 107 while ((ch = getopt(argc, argv, "d:pv")) != EOF) 108 switch(ch) { 109 case 'd': 110 strncpy(prefix, optarg, sizeof(prefix)); 111 prefix[sizeof(prefix)-1] = '\0'; 112 break; 113 case 'p': /* create V7 "file.orig" */ 114 makeold = 1; 115 break; 116 case 'v': /* backward compatible */ 117 break; 118 case '?': 119 default: 120 usage(); 121 } 122 argc -= optind; 123 argv += optind; 124 125 if (argc != 1) 126 usage(); 127 128 /* 129 * This could be changed to allow the user to interrupt. 130 * Probably not worth the effort. 131 */ 132 sigemptyset(&set); 133 sigaddset(&set, SIGTSTP); 134 sigaddset(&set, SIGHUP); 135 sigaddset(&set, SIGINT); 136 sigaddset(&set, SIGQUIT); 137 sigaddset(&set, SIGTERM); 138 (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL); 139 140 /* We don't care what the user wants. */ 141 (void)umask(0); 142 143 pname = *argv; 144 /* Open the original password file */ 145 if (!(fp = fopen(pname, "r"))) 146 error(pname); 147 148 /* Open the temporary insecure password database. */ 149 (void)snprintf(buf, sizeof(buf), "%s%s.tmp", prefix, _PATH_MP_DB); 150 dp = dbopen(buf, 151 O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 152 if (dp == NULL) 153 error(buf); 154 clean = FILE_INSECURE; 155 156 /* 157 * Open file for old password file. Minor trickiness -- don't want to 158 * chance the file already existing, since someone (stupidly) might 159 * still be using this for permission checking. So, open it first and 160 * fdopen the resulting fd. The resulting file should be readable by 161 * everyone. 162 */ 163 if (makeold) { 164 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 165 if ((tfd = open(buf, 166 O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0) 167 error(buf); 168 if ((oldfp = fdopen(tfd, "w")) == NULL) 169 error(buf); 170 clean = FILE_ORIG; 171 } 172 173 /* 174 * The databases actually contain three copies of the original data. 175 * Each password file entry is converted into a rough approximation 176 * of a ``struct passwd'', with the strings placed inline. This 177 * object is then stored as the data for three separate keys. The 178 * first key * is the pw_name field prepended by the _PW_KEYBYNAME 179 * character. The second key is the pw_uid field prepended by the 180 * _PW_KEYBYUID character. The third key is the line number in the 181 * original file prepended by the _PW_KEYBYNUM character. (The special 182 * characters are prepended to ensure that the keys do not collide.) 183 * 184 * If we see something go by that looks like YP, we save a special 185 * pointer record, which if YP is enabled in the C lib, will speed 186 * things up. 187 */ 188 data.data = (u_char *)buf; 189 key.data = (u_char *)tbuf; 190 for (cnt = 1; scan(fp, &pwd, &flags); ++cnt) { 191 #define COMPACT(e) t = e; while ((*p++ = *t++)); 192 193 /* look like YP? */ 194 if((pwd.pw_name[0] == '+') || (pwd.pw_name[0] == '-')) 195 hasyp++; 196 197 /* 198 * Warn about potentially unsafe uid/gid overrides. 199 */ 200 if (pwd.pw_name[0] == '+') { 201 if ((flags & _PASSWORD_NOUID) == 0 && pwd.pw_uid == 0) 202 warnx("line %d: superuser override in YP inclusion", cnt); 203 if ((flags & _PASSWORD_NOGID) == 0 && pwd.pw_gid == 0) 204 warnx("line %d: wheel override in YP inclusion", cnt); 205 } 206 207 /* Create insecure data. */ 208 p = buf; 209 COMPACT(pwd.pw_name); 210 COMPACT("*"); 211 memmove(p, &pwd.pw_uid, sizeof(int)); 212 p += sizeof(int); 213 memmove(p, &pwd.pw_gid, sizeof(int)); 214 p += sizeof(int); 215 memmove(p, &pwd.pw_change, sizeof(time_t)); 216 p += sizeof(time_t); 217 COMPACT(pwd.pw_class); 218 COMPACT(pwd.pw_gecos); 219 COMPACT(pwd.pw_dir); 220 COMPACT(pwd.pw_shell); 221 memmove(p, &pwd.pw_expire, sizeof(time_t)); 222 p += sizeof(time_t); 223 memmove(p, &flags, sizeof(int)); 224 p += sizeof(int); 225 data.size = p - buf; 226 227 /* Store insecure by name. */ 228 tbuf[0] = _PW_KEYBYNAME; 229 len = strlen(pwd.pw_name); 230 memmove(tbuf + 1, pwd.pw_name, len); 231 key.size = len + 1; 232 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 233 error("put"); 234 235 /* Store insecure by number. */ 236 tbuf[0] = _PW_KEYBYNUM; 237 memmove(tbuf + 1, &cnt, sizeof(cnt)); 238 key.size = sizeof(cnt) + 1; 239 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 240 error("put"); 241 242 /* Store insecure by uid. */ 243 tbuf[0] = _PW_KEYBYUID; 244 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 245 key.size = sizeof(pwd.pw_uid) + 1; 246 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 247 error("put"); 248 249 /* Create original format password file entry */ 250 if (makeold) 251 (void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n", 252 pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos, 253 pwd.pw_dir, pwd.pw_shell); 254 } 255 256 /* Store YP token, if needed. */ 257 if(hasyp) { 258 ypkey.data = (u_char *)__yp_token; 259 ypkey.size = strlen(__yp_token); 260 ypdata.data = (u_char *)NULL; 261 ypdata.size = 0; 262 263 if ((dp->put)(dp, &ypkey, &ypdata, R_NOOVERWRITE) == -1) 264 error("put"); 265 } 266 267 (void)(dp->close)(dp); 268 if (makeold) { 269 (void)fflush(oldfp); 270 (void)fclose(oldfp); 271 } 272 273 /* Open the temporary encrypted password database. */ 274 (void)snprintf(buf, sizeof(buf), "%s%s.tmp", prefix, _PATH_SMP_DB); 275 edp = dbopen(buf, 276 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 277 if (!edp) 278 error(buf); 279 clean = FILE_SECURE; 280 281 rewind(fp); 282 for (cnt = 1; scan(fp, &pwd, &flags); ++cnt) { 283 284 /* Create secure data. */ 285 p = buf; 286 COMPACT(pwd.pw_name); 287 COMPACT(pwd.pw_passwd); 288 memmove(p, &pwd.pw_uid, sizeof(int)); 289 p += sizeof(int); 290 memmove(p, &pwd.pw_gid, sizeof(int)); 291 p += sizeof(int); 292 memmove(p, &pwd.pw_change, sizeof(time_t)); 293 p += sizeof(time_t); 294 COMPACT(pwd.pw_class); 295 COMPACT(pwd.pw_gecos); 296 COMPACT(pwd.pw_dir); 297 COMPACT(pwd.pw_shell); 298 memmove(p, &pwd.pw_expire, sizeof(time_t)); 299 p += sizeof(time_t); 300 memmove(p, &flags, sizeof(int)); 301 p += sizeof(int); 302 data.size = p - buf; 303 304 /* Store secure by name. */ 305 tbuf[0] = _PW_KEYBYNAME; 306 len = strlen(pwd.pw_name); 307 memmove(tbuf + 1, pwd.pw_name, len); 308 key.size = len + 1; 309 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 310 error("put"); 311 312 /* Store secure by number. */ 313 tbuf[0] = _PW_KEYBYNUM; 314 memmove(tbuf + 1, &cnt, sizeof(cnt)); 315 key.size = sizeof(cnt) + 1; 316 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 317 error("put"); 318 319 /* Store secure by uid. */ 320 tbuf[0] = _PW_KEYBYUID; 321 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 322 key.size = sizeof(pwd.pw_uid) + 1; 323 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 324 error("put"); 325 } 326 327 /* Store YP token, if needed. */ 328 if(hasyp) { 329 ypkey.data = (u_char *)__yp_token; 330 ypkey.size = strlen(__yp_token); 331 ypdata.data = (u_char *)NULL; 332 ypdata.size = 0; 333 334 if((dp->put)(edp, &ypkey, &ypdata, R_NOOVERWRITE) == -1) 335 error("put"); 336 } 337 338 (void)(edp->close)(edp); 339 340 /* Set master.passwd permissions, in case caller forgot. */ 341 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 342 (void)fclose(fp); 343 344 /* Install as the real password files. */ 345 (void)snprintf(buf, sizeof(buf), "%s%s.tmp", prefix, _PATH_MP_DB); 346 (void)snprintf(buf2, sizeof(buf2), "%s%s", prefix, _PATH_MP_DB); 347 mv(buf, buf2); 348 (void)snprintf(buf, sizeof(buf), "%s%s.tmp", prefix, _PATH_SMP_DB); 349 (void)snprintf(buf2, sizeof(buf2), "%s%s", prefix, _PATH_SMP_DB); 350 mv(buf, buf2); 351 if (makeold) { 352 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 353 (void)snprintf(buf2, sizeof(buf2), "%s%s", prefix, 354 _PATH_PASSWD); 355 mv(buf, buf2); 356 } 357 /* 358 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 359 * all use flock(2) on it to block other incarnations of themselves. 360 * The rename means that everything is unlocked, as the original file 361 * can no longer be accessed. 362 */ 363 (void)snprintf(buf, sizeof(buf), "%s%s", prefix, _PATH_MASTERPASSWD); 364 mv(pname, buf); 365 exit(0); 366 } 367 368 int 369 scan(fp, pw, flags) 370 FILE *fp; 371 struct passwd *pw; 372 int *flags; 373 { 374 static int lcnt; 375 static char line[LINE_MAX]; 376 char *p; 377 378 if (!fgets(line, sizeof(line), fp)) 379 return (0); 380 ++lcnt; 381 /* 382 * ``... if I swallow anything evil, put your fingers down my 383 * throat...'' 384 * -- The Who 385 */ 386 if (!(p = strchr(line, '\n'))) { 387 warnx("line too long"); 388 goto fmt; 389 390 } 391 *p = '\0'; 392 if (!pw_scan(line, pw, flags)) { 393 warnx("at line #%d", lcnt); 394 fmt: errno = EFTYPE; /* XXX */ 395 error(pname); 396 } 397 398 return (1); 399 } 400 401 void 402 mv(from, to) 403 char *from, *to; 404 { 405 char buf[MAXPATHLEN]; 406 407 if (rename(from, to)) { 408 int sverrno = errno; 409 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 410 errno = sverrno; 411 error(buf); 412 } 413 } 414 415 void 416 error(name) 417 char *name; 418 { 419 420 warn(name); 421 cleanup(); 422 exit(1); 423 } 424 425 void 426 cleanup() 427 { 428 char buf[MAXPATHLEN]; 429 430 switch(clean) { 431 case FILE_ORIG: 432 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 433 (void)unlink(buf); 434 /* FALLTHROUGH */ 435 case FILE_SECURE: 436 (void)snprintf(buf, sizeof(buf), "%s%s.tmp", prefix, 437 _PATH_SMP_DB); 438 (void)unlink(buf); 439 /* FALLTHROUGH */ 440 case FILE_INSECURE: 441 (void)snprintf(buf, sizeof(buf), "%s%s.tmp", prefix, 442 _PATH_MP_DB); 443 (void)unlink(buf); 444 } 445 } 446 447 void 448 usage() 449 { 450 451 (void)fprintf(stderr, "usage: pwd_mkdb [-p] [-d directory] file\n"); 452 exit(1); 453 } 454
Indexes created Tue Sep 30 17:09:57 GMT 2025