pwd_mkdb.c revision 1.7
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 1.7 1996/05/15 23:19:16 jtc 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 83 void cleanup __P((void)); 84 void error __P((char *)); 85 void mv __P((char *, char *)); 86 int scan __P((FILE *, struct passwd *, int *)); 87 void usage __P((void)); 88 89 int 90 main(argc, argv) 91 int argc; 92 char *argv[]; 93 { 94 DB *dp, *edp; 95 DBT data, key; 96 FILE *fp, *oldfp; 97 sigset_t set; 98 int ch, cnt, len, makeold, tfd, flags; 99 char *p, *t; 100 char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024]; 101 int hasyp = 0; 102 DBT ypdata, ypkey; 103 104 makeold = 0; 105 while ((ch = getopt(argc, argv, "pv")) != EOF) 106 switch(ch) { 107 case 'p': /* create V7 "file.orig" */ 108 makeold = 1; 109 break; 110 case 'v': /* backward compatible */ 111 break; 112 case '?': 113 default: 114 usage(); 115 } 116 argc -= optind; 117 argv += optind; 118 119 if (argc != 1) 120 usage(); 121 122 /* 123 * This could be changed to allow the user to interrupt. 124 * Probably not worth the effort. 125 */ 126 sigemptyset(&set); 127 sigaddset(&set, SIGTSTP); 128 sigaddset(&set, SIGHUP); 129 sigaddset(&set, SIGINT); 130 sigaddset(&set, SIGQUIT); 131 sigaddset(&set, SIGTERM); 132 (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL); 133 134 /* We don't care what the user wants. */ 135 (void)umask(0); 136 137 pname = *argv; 138 /* Open the original password file */ 139 if (!(fp = fopen(pname, "r"))) 140 error(pname); 141 142 /* Open the temporary insecure password database. */ 143 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_MP_DB); 144 dp = dbopen(buf, 145 O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 146 if (dp == NULL) 147 error(buf); 148 clean = FILE_INSECURE; 149 150 /* 151 * Open file for old password file. Minor trickiness -- don't want to 152 * chance the file already existing, since someone (stupidly) might 153 * still be using this for permission checking. So, open it first and 154 * fdopen the resulting fd. The resulting file should be readable by 155 * everyone. 156 */ 157 if (makeold) { 158 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 159 if ((tfd = open(buf, 160 O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0) 161 error(buf); 162 if ((oldfp = fdopen(tfd, "w")) == NULL) 163 error(buf); 164 clean = FILE_ORIG; 165 } 166 167 /* 168 * The databases actually contain three copies of the original data. 169 * Each password file entry is converted into a rough approximation 170 * of a ``struct passwd'', with the strings placed inline. This 171 * object is then stored as the data for three separate keys. The 172 * first key * is the pw_name field prepended by the _PW_KEYBYNAME 173 * character. The second key is the pw_uid field prepended by the 174 * _PW_KEYBYUID character. The third key is the line number in the 175 * original file prepended by the _PW_KEYBYNUM character. (The special 176 * characters are prepended to ensure that the keys do not collide.) 177 * 178 * If we see something go by that looks like YP, we save a special 179 * pointer record, which if YP is enabled in the C lib, will speed 180 * things up. 181 */ 182 data.data = (u_char *)buf; 183 key.data = (u_char *)tbuf; 184 for (cnt = 1; scan(fp, &pwd, &flags); ++cnt) { 185 #define COMPACT(e) t = e; while (*p++ = *t++); 186 187 /* look like YP? */ 188 if((pwd.pw_name[0] == '+') || (pwd.pw_name[0] == '-')) 189 hasyp++; 190 191 /* Create insecure data. */ 192 p = buf; 193 COMPACT(pwd.pw_name); 194 COMPACT("*"); 195 memmove(p, &pwd.pw_uid, sizeof(int)); 196 p += sizeof(int); 197 memmove(p, &pwd.pw_gid, sizeof(int)); 198 p += sizeof(int); 199 memmove(p, &pwd.pw_change, sizeof(time_t)); 200 p += sizeof(time_t); 201 COMPACT(pwd.pw_class); 202 COMPACT(pwd.pw_gecos); 203 COMPACT(pwd.pw_dir); 204 COMPACT(pwd.pw_shell); 205 memmove(p, &pwd.pw_expire, sizeof(time_t)); 206 p += sizeof(time_t); 207 memmove(p, &flags, sizeof(int)); 208 p += sizeof(int); 209 data.size = p - buf; 210 211 /* Store insecure by name. */ 212 tbuf[0] = _PW_KEYBYNAME; 213 len = strlen(pwd.pw_name); 214 memmove(tbuf + 1, pwd.pw_name, len); 215 key.size = len + 1; 216 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 217 error("put"); 218 219 /* Store insecure by number. */ 220 tbuf[0] = _PW_KEYBYNUM; 221 memmove(tbuf + 1, &cnt, sizeof(cnt)); 222 key.size = sizeof(cnt) + 1; 223 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 224 error("put"); 225 226 /* Store insecure by uid. */ 227 tbuf[0] = _PW_KEYBYUID; 228 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 229 key.size = sizeof(pwd.pw_uid) + 1; 230 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 231 error("put"); 232 233 /* Create original format password file entry */ 234 if (makeold) 235 (void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n", 236 pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos, 237 pwd.pw_dir, pwd.pw_shell); 238 } 239 240 /* Store YP token, if needed. */ 241 if(hasyp) { 242 ypkey.data = (u_char *)__yp_token; 243 ypkey.size = strlen(__yp_token); 244 ypdata.data = (u_char *)NULL; 245 ypdata.size = 0; 246 247 if ((dp->put)(dp, &ypkey, &ypdata, R_NOOVERWRITE) == -1) 248 error("put"); 249 } 250 251 (void)(dp->close)(dp); 252 if (makeold) { 253 (void)fflush(oldfp); 254 (void)fclose(oldfp); 255 } 256 257 /* Open the temporary encrypted password database. */ 258 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_SMP_DB); 259 edp = dbopen(buf, 260 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 261 if (!edp) 262 error(buf); 263 clean = FILE_SECURE; 264 265 rewind(fp); 266 for (cnt = 1; scan(fp, &pwd, &flags); ++cnt) { 267 268 /* Create secure data. */ 269 p = buf; 270 COMPACT(pwd.pw_name); 271 COMPACT(pwd.pw_passwd); 272 memmove(p, &pwd.pw_uid, sizeof(int)); 273 p += sizeof(int); 274 memmove(p, &pwd.pw_gid, sizeof(int)); 275 p += sizeof(int); 276 memmove(p, &pwd.pw_change, sizeof(time_t)); 277 p += sizeof(time_t); 278 COMPACT(pwd.pw_class); 279 COMPACT(pwd.pw_gecos); 280 COMPACT(pwd.pw_dir); 281 COMPACT(pwd.pw_shell); 282 memmove(p, &pwd.pw_expire, sizeof(time_t)); 283 p += sizeof(time_t); 284 memmove(p, &flags, sizeof(int)); 285 p += sizeof(int); 286 data.size = p - buf; 287 288 /* Store secure by name. */ 289 tbuf[0] = _PW_KEYBYNAME; 290 len = strlen(pwd.pw_name); 291 memmove(tbuf + 1, pwd.pw_name, len); 292 key.size = len + 1; 293 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 294 error("put"); 295 296 /* Store secure by number. */ 297 tbuf[0] = _PW_KEYBYNUM; 298 memmove(tbuf + 1, &cnt, sizeof(cnt)); 299 key.size = sizeof(cnt) + 1; 300 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 301 error("put"); 302 303 /* Store secure by uid. */ 304 tbuf[0] = _PW_KEYBYUID; 305 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 306 key.size = sizeof(pwd.pw_uid) + 1; 307 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 308 error("put"); 309 } 310 311 /* Store YP token, if needed. */ 312 if(hasyp) { 313 ypkey.data = (u_char *)__yp_token; 314 ypkey.size = strlen(__yp_token); 315 ypdata.data = (u_char *)NULL; 316 ypdata.size = 0; 317 318 if((dp->put)(edp, &ypkey, &ypdata, R_NOOVERWRITE) == -1) 319 error("put"); 320 } 321 322 (void)(edp->close)(edp); 323 324 /* Set master.passwd permissions, in case caller forgot. */ 325 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 326 (void)fclose(fp); 327 328 /* Install as the real password files. */ 329 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_MP_DB); 330 mv(buf, _PATH_MP_DB); 331 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_SMP_DB); 332 mv(buf, _PATH_SMP_DB); 333 if (makeold) { 334 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 335 mv(buf, _PATH_PASSWD); 336 } 337 /* 338 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 339 * all use flock(2) on it to block other incarnations of themselves. 340 * The rename means that everything is unlocked, as the original file 341 * can no longer be accessed. 342 */ 343 mv(pname, _PATH_MASTERPASSWD); 344 exit(0); 345 } 346 347 int 348 scan(fp, pw, flags) 349 FILE *fp; 350 struct passwd *pw; 351 int *flags; 352 { 353 static int lcnt; 354 static char line[LINE_MAX]; 355 char *p; 356 357 if (!fgets(line, sizeof(line), fp)) 358 return (0); 359 ++lcnt; 360 /* 361 * ``... if I swallow anything evil, put your fingers down my 362 * throat...'' 363 * -- The Who 364 */ 365 if (!(p = strchr(line, '\n'))) { 366 warnx("line too long"); 367 goto fmt; 368 369 } 370 *p = '\0'; 371 if (!pw_scan(line, pw, flags)) { 372 warnx("at line #%d", lcnt); 373 fmt: errno = EFTYPE; /* XXX */ 374 error(pname); 375 } 376 377 return (1); 378 } 379 380 void 381 mv(from, to) 382 char *from, *to; 383 { 384 char buf[MAXPATHLEN]; 385 386 if (rename(from, to)) { 387 int sverrno = errno; 388 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 389 errno = sverrno; 390 error(buf); 391 } 392 } 393 394 void 395 error(name) 396 char *name; 397 { 398 399 warn(name); 400 cleanup(); 401 exit(1); 402 } 403 404 void 405 cleanup() 406 { 407 char buf[MAXPATHLEN]; 408 409 switch(clean) { 410 case FILE_ORIG: 411 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 412 (void)unlink(buf); 413 /* FALLTHROUGH */ 414 case FILE_SECURE: 415 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_SMP_DB); 416 (void)unlink(buf); 417 /* FALLTHROUGH */ 418 case FILE_INSECURE: 419 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_MP_DB); 420 (void)unlink(buf); 421 } 422 } 423 424 void 425 usage() 426 { 427 428 (void)fprintf(stderr, "usage: pwd_mkdb [-p] file\n"); 429 exit(1); 430 } 431
Indexes created Tue Sep 30 20:09:53 GMT 2025