pwd_mkdb.c revision 1.8
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 1.8 1996/11/22 05:37:30 lukem 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 /* Create insecure data. */ 198 p = buf; 199 COMPACT(pwd.pw_name); 200 COMPACT("*"); 201 memmove(p, &pwd.pw_uid, sizeof(int)); 202 p += sizeof(int); 203 memmove(p, &pwd.pw_gid, sizeof(int)); 204 p += sizeof(int); 205 memmove(p, &pwd.pw_change, sizeof(time_t)); 206 p += sizeof(time_t); 207 COMPACT(pwd.pw_class); 208 COMPACT(pwd.pw_gecos); 209 COMPACT(pwd.pw_dir); 210 COMPACT(pwd.pw_shell); 211 memmove(p, &pwd.pw_expire, sizeof(time_t)); 212 p += sizeof(time_t); 213 memmove(p, &flags, sizeof(int)); 214 p += sizeof(int); 215 data.size = p - buf; 216 217 /* Store insecure by name. */ 218 tbuf[0] = _PW_KEYBYNAME; 219 len = strlen(pwd.pw_name); 220 memmove(tbuf + 1, pwd.pw_name, len); 221 key.size = len + 1; 222 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 223 error("put"); 224 225 /* Store insecure by number. */ 226 tbuf[0] = _PW_KEYBYNUM; 227 memmove(tbuf + 1, &cnt, sizeof(cnt)); 228 key.size = sizeof(cnt) + 1; 229 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 230 error("put"); 231 232 /* Store insecure by uid. */ 233 tbuf[0] = _PW_KEYBYUID; 234 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 235 key.size = sizeof(pwd.pw_uid) + 1; 236 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 237 error("put"); 238 239 /* Create original format password file entry */ 240 if (makeold) 241 (void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n", 242 pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos, 243 pwd.pw_dir, pwd.pw_shell); 244 } 245 246 /* Store YP token, if needed. */ 247 if(hasyp) { 248 ypkey.data = (u_char *)__yp_token; 249 ypkey.size = strlen(__yp_token); 250 ypdata.data = (u_char *)NULL; 251 ypdata.size = 0; 252 253 if ((dp->put)(dp, &ypkey, &ypdata, R_NOOVERWRITE) == -1) 254 error("put"); 255 } 256 257 (void)(dp->close)(dp); 258 if (makeold) { 259 (void)fflush(oldfp); 260 (void)fclose(oldfp); 261 } 262 263 /* Open the temporary encrypted password database. */ 264 (void)snprintf(buf, sizeof(buf), "%s%s.tmp", prefix, _PATH_SMP_DB); 265 edp = dbopen(buf, 266 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 267 if (!edp) 268 error(buf); 269 clean = FILE_SECURE; 270 271 rewind(fp); 272 for (cnt = 1; scan(fp, &pwd, &flags); ++cnt) { 273 274 /* Create secure data. */ 275 p = buf; 276 COMPACT(pwd.pw_name); 277 COMPACT(pwd.pw_passwd); 278 memmove(p, &pwd.pw_uid, sizeof(int)); 279 p += sizeof(int); 280 memmove(p, &pwd.pw_gid, sizeof(int)); 281 p += sizeof(int); 282 memmove(p, &pwd.pw_change, sizeof(time_t)); 283 p += sizeof(time_t); 284 COMPACT(pwd.pw_class); 285 COMPACT(pwd.pw_gecos); 286 COMPACT(pwd.pw_dir); 287 COMPACT(pwd.pw_shell); 288 memmove(p, &pwd.pw_expire, sizeof(time_t)); 289 p += sizeof(time_t); 290 memmove(p, &flags, sizeof(int)); 291 p += sizeof(int); 292 data.size = p - buf; 293 294 /* Store secure by name. */ 295 tbuf[0] = _PW_KEYBYNAME; 296 len = strlen(pwd.pw_name); 297 memmove(tbuf + 1, pwd.pw_name, len); 298 key.size = len + 1; 299 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 300 error("put"); 301 302 /* Store secure by number. */ 303 tbuf[0] = _PW_KEYBYNUM; 304 memmove(tbuf + 1, &cnt, sizeof(cnt)); 305 key.size = sizeof(cnt) + 1; 306 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 307 error("put"); 308 309 /* Store secure by uid. */ 310 tbuf[0] = _PW_KEYBYUID; 311 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 312 key.size = sizeof(pwd.pw_uid) + 1; 313 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 314 error("put"); 315 } 316 317 /* Store YP token, if needed. */ 318 if(hasyp) { 319 ypkey.data = (u_char *)__yp_token; 320 ypkey.size = strlen(__yp_token); 321 ypdata.data = (u_char *)NULL; 322 ypdata.size = 0; 323 324 if((dp->put)(edp, &ypkey, &ypdata, R_NOOVERWRITE) == -1) 325 error("put"); 326 } 327 328 (void)(edp->close)(edp); 329 330 /* Set master.passwd permissions, in case caller forgot. */ 331 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 332 (void)fclose(fp); 333 334 /* Install as the real password files. */ 335 (void)snprintf(buf, sizeof(buf), "%s%s.tmp", prefix, _PATH_MP_DB); 336 (void)snprintf(buf2, sizeof(buf2), "%s%s", prefix, _PATH_MP_DB); 337 mv(buf, buf2); 338 (void)snprintf(buf, sizeof(buf), "%s%s.tmp", prefix, _PATH_SMP_DB); 339 (void)snprintf(buf2, sizeof(buf2), "%s%s", prefix, _PATH_SMP_DB); 340 mv(buf, buf2); 341 if (makeold) { 342 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 343 (void)snprintf(buf2, sizeof(buf2), "%s%s", prefix, 344 _PATH_PASSWD); 345 mv(buf, buf2); 346 } 347 /* 348 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 349 * all use flock(2) on it to block other incarnations of themselves. 350 * The rename means that everything is unlocked, as the original file 351 * can no longer be accessed. 352 */ 353 (void)snprintf(buf, sizeof(buf), "%s%s", prefix, _PATH_MASTERPASSWD); 354 mv(pname, buf); 355 exit(0); 356 } 357 358 int 359 scan(fp, pw, flags) 360 FILE *fp; 361 struct passwd *pw; 362 int *flags; 363 { 364 static int lcnt; 365 static char line[LINE_MAX]; 366 char *p; 367 368 if (!fgets(line, sizeof(line), fp)) 369 return (0); 370 ++lcnt; 371 /* 372 * ``... if I swallow anything evil, put your fingers down my 373 * throat...'' 374 * -- The Who 375 */ 376 if (!(p = strchr(line, '\n'))) { 377 warnx("line too long"); 378 goto fmt; 379 380 } 381 *p = '\0'; 382 if (!pw_scan(line, pw, flags)) { 383 warnx("at line #%d", lcnt); 384 fmt: errno = EFTYPE; /* XXX */ 385 error(pname); 386 } 387 388 return (1); 389 } 390 391 void 392 mv(from, to) 393 char *from, *to; 394 { 395 char buf[MAXPATHLEN]; 396 397 if (rename(from, to)) { 398 int sverrno = errno; 399 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 400 errno = sverrno; 401 error(buf); 402 } 403 } 404 405 void 406 error(name) 407 char *name; 408 { 409 410 warn(name); 411 cleanup(); 412 exit(1); 413 } 414 415 void 416 cleanup() 417 { 418 char buf[MAXPATHLEN]; 419 420 switch(clean) { 421 case FILE_ORIG: 422 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 423 (void)unlink(buf); 424 /* FALLTHROUGH */ 425 case FILE_SECURE: 426 (void)snprintf(buf, sizeof(buf), "%s%s.tmp", prefix, 427 _PATH_SMP_DB); 428 (void)unlink(buf); 429 /* FALLTHROUGH */ 430 case FILE_INSECURE: 431 (void)snprintf(buf, sizeof(buf), "%s%s.tmp", prefix, 432 _PATH_MP_DB); 433 (void)unlink(buf); 434 } 435 } 436 437 void 438 usage() 439 { 440 441 (void)fprintf(stderr, "usage: pwd_mkdb [-p] [-d directory] file\n"); 442 exit(1); 443 } 444
Indexes created Tue Sep 30 17:09:57 GMT 2025