pwd_mkdb.c revision 1.6
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 1.6 1995/07/28 07:13:52 phil 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 61 #include "pw_scan.h" 62 63 #define INSECURE 1 64 #define SECURE 2 65 #define PERM_INSECURE (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) 66 #define PERM_SECURE (S_IRUSR|S_IWUSR) 67 68 /* pull this out of the C library. */ 69 extern const char __yp_token[]; 70 71 HASHINFO openinfo = { 72 4096, /* bsize */ 73 32, /* ffactor */ 74 256, /* nelem */ 75 2048 * 1024, /* cachesize */ 76 NULL, /* hash() */ 77 0 /* lorder */ 78 }; 79 80 static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean; 81 static struct passwd pwd; /* password structure */ 82 static char *pname; /* password file name */ 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)], tbuf[1024]; 102 int hasyp = 0; 103 DBT ypdata, ypkey; 104 105 makeold = 0; 106 while ((ch = getopt(argc, argv, "pv")) != EOF) 107 switch(ch) { 108 case 'p': /* create V7 "file.orig" */ 109 makeold = 1; 110 break; 111 case 'v': /* backward compatible */ 112 break; 113 case '?': 114 default: 115 usage(); 116 } 117 argc -= optind; 118 argv += optind; 119 120 if (argc != 1) 121 usage(); 122 123 /* 124 * This could be changed to allow the user to interrupt. 125 * Probably not worth the effort. 126 */ 127 sigemptyset(&set); 128 sigaddset(&set, SIGTSTP); 129 sigaddset(&set, SIGHUP); 130 sigaddset(&set, SIGINT); 131 sigaddset(&set, SIGQUIT); 132 sigaddset(&set, SIGTERM); 133 (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL); 134 135 /* We don't care what the user wants. */ 136 (void)umask(0); 137 138 pname = *argv; 139 /* Open the original password file */ 140 if (!(fp = fopen(pname, "r"))) 141 error(pname); 142 143 /* Open the temporary insecure password database. */ 144 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_MP_DB); 145 dp = dbopen(buf, 146 O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 147 if (dp == NULL) 148 error(buf); 149 clean = FILE_INSECURE; 150 151 /* 152 * Open file for old password file. Minor trickiness -- don't want to 153 * chance the file already existing, since someone (stupidly) might 154 * still be using this for permission checking. So, open it first and 155 * fdopen the resulting fd. The resulting file should be readable by 156 * everyone. 157 */ 158 if (makeold) { 159 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 160 if ((tfd = open(buf, 161 O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0) 162 error(buf); 163 if ((oldfp = fdopen(tfd, "w")) == NULL) 164 error(buf); 165 clean = FILE_ORIG; 166 } 167 168 /* 169 * The databases actually contain three copies of the original data. 170 * Each password file entry is converted into a rough approximation 171 * of a ``struct passwd'', with the strings placed inline. This 172 * object is then stored as the data for three separate keys. The 173 * first key * is the pw_name field prepended by the _PW_KEYBYNAME 174 * character. The second key is the pw_uid field prepended by the 175 * _PW_KEYBYUID character. The third key is the line number in the 176 * original file prepended by the _PW_KEYBYNUM character. (The special 177 * characters are prepended to ensure that the keys do not collide.) 178 * 179 * If we see something go by that looks like YP, we save a special 180 * pointer record, which if YP is enabled in the C lib, will speed 181 * things up. 182 */ 183 data.data = (u_char *)buf; 184 key.data = (u_char *)tbuf; 185 for (cnt = 1; scan(fp, &pwd, &flags); ++cnt) { 186 #define COMPACT(e) t = e; while (*p++ = *t++); 187 188 /* look like YP? */ 189 if((pwd.pw_name[0] == '+') || (pwd.pw_name[0] == '-')) 190 hasyp++; 191 192 /* Create insecure data. */ 193 p = buf; 194 COMPACT(pwd.pw_name); 195 COMPACT("*"); 196 memmove(p, &pwd.pw_uid, sizeof(int)); 197 p += sizeof(int); 198 memmove(p, &pwd.pw_gid, sizeof(int)); 199 p += sizeof(int); 200 memmove(p, &pwd.pw_change, sizeof(time_t)); 201 p += sizeof(time_t); 202 COMPACT(pwd.pw_class); 203 COMPACT(pwd.pw_gecos); 204 COMPACT(pwd.pw_dir); 205 COMPACT(pwd.pw_shell); 206 memmove(p, &pwd.pw_expire, sizeof(time_t)); 207 p += sizeof(time_t); 208 memmove(p, &flags, sizeof(int)); 209 p += sizeof(int); 210 data.size = p - buf; 211 212 /* Store insecure by name. */ 213 tbuf[0] = _PW_KEYBYNAME; 214 len = strlen(pwd.pw_name); 215 memmove(tbuf + 1, pwd.pw_name, len); 216 key.size = len + 1; 217 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 218 error("put"); 219 220 /* Store insecure by number. */ 221 tbuf[0] = _PW_KEYBYNUM; 222 memmove(tbuf + 1, &cnt, sizeof(cnt)); 223 key.size = sizeof(cnt) + 1; 224 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 225 error("put"); 226 227 /* Store insecure by uid. */ 228 tbuf[0] = _PW_KEYBYUID; 229 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 230 key.size = sizeof(pwd.pw_uid) + 1; 231 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 232 error("put"); 233 234 /* Create original format password file entry */ 235 if (makeold) 236 (void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n", 237 pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos, 238 pwd.pw_dir, pwd.pw_shell); 239 } 240 241 /* Store YP token, if needed. */ 242 if(hasyp) { 243 ypkey.data = (u_char *)__yp_token; 244 ypkey.size = strlen(__yp_token); 245 ypdata.data = (u_char *)NULL; 246 ypdata.size = 0; 247 248 if ((dp->put)(dp, &ypkey, &ypdata, R_NOOVERWRITE) == -1) 249 error("put"); 250 } 251 252 (void)(dp->close)(dp); 253 if (makeold) { 254 (void)fflush(oldfp); 255 (void)fclose(oldfp); 256 } 257 258 /* Open the temporary encrypted password database. */ 259 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_SMP_DB); 260 edp = dbopen(buf, 261 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 262 if (!edp) 263 error(buf); 264 clean = FILE_SECURE; 265 266 rewind(fp); 267 for (cnt = 1; scan(fp, &pwd, &flags); ++cnt) { 268 269 /* Create secure data. */ 270 p = buf; 271 COMPACT(pwd.pw_name); 272 COMPACT(pwd.pw_passwd); 273 memmove(p, &pwd.pw_uid, sizeof(int)); 274 p += sizeof(int); 275 memmove(p, &pwd.pw_gid, sizeof(int)); 276 p += sizeof(int); 277 memmove(p, &pwd.pw_change, sizeof(time_t)); 278 p += sizeof(time_t); 279 COMPACT(pwd.pw_class); 280 COMPACT(pwd.pw_gecos); 281 COMPACT(pwd.pw_dir); 282 COMPACT(pwd.pw_shell); 283 memmove(p, &pwd.pw_expire, sizeof(time_t)); 284 p += sizeof(time_t); 285 memmove(p, &flags, sizeof(int)); 286 p += sizeof(int); 287 data.size = p - buf; 288 289 /* Store secure by name. */ 290 tbuf[0] = _PW_KEYBYNAME; 291 len = strlen(pwd.pw_name); 292 memmove(tbuf + 1, pwd.pw_name, len); 293 key.size = len + 1; 294 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 295 error("put"); 296 297 /* Store secure by number. */ 298 tbuf[0] = _PW_KEYBYNUM; 299 memmove(tbuf + 1, &cnt, sizeof(cnt)); 300 key.size = sizeof(cnt) + 1; 301 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 302 error("put"); 303 304 /* Store secure by uid. */ 305 tbuf[0] = _PW_KEYBYUID; 306 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 307 key.size = sizeof(pwd.pw_uid) + 1; 308 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 309 error("put"); 310 } 311 312 /* Store YP token, if needed. */ 313 if(hasyp) { 314 ypkey.data = (u_char *)__yp_token; 315 ypkey.size = strlen(__yp_token); 316 ypdata.data = (u_char *)NULL; 317 ypdata.size = 0; 318 319 if((dp->put)(edp, &ypkey, &ypdata, R_NOOVERWRITE) == -1) 320 error("put"); 321 } 322 323 (void)(edp->close)(edp); 324 325 /* Set master.passwd permissions, in case caller forgot. */ 326 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 327 (void)fclose(fp); 328 329 /* Install as the real password files. */ 330 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_MP_DB); 331 mv(buf, _PATH_MP_DB); 332 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_SMP_DB); 333 mv(buf, _PATH_SMP_DB); 334 if (makeold) { 335 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 336 mv(buf, _PATH_PASSWD); 337 } 338 /* 339 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 340 * all use flock(2) on it to block other incarnations of themselves. 341 * The rename means that everything is unlocked, as the original file 342 * can no longer be accessed. 343 */ 344 mv(pname, _PATH_MASTERPASSWD); 345 exit(0); 346 } 347 348 int 349 scan(fp, pw, flags) 350 FILE *fp; 351 struct passwd *pw; 352 int *flags; 353 { 354 static int lcnt; 355 static char line[LINE_MAX]; 356 char *p; 357 358 if (!fgets(line, sizeof(line), fp)) 359 return (0); 360 ++lcnt; 361 /* 362 * ``... if I swallow anything evil, put your fingers down my 363 * throat...'' 364 * -- The Who 365 */ 366 if (!(p = strchr(line, '\n'))) { 367 warnx("line too long"); 368 goto fmt; 369 370 } 371 *p = '\0'; 372 if (!pw_scan(line, pw, flags)) { 373 warnx("at line #%d", lcnt); 374 fmt: errno = EFTYPE; /* XXX */ 375 error(pname); 376 } 377 378 return (1); 379 } 380 381 void 382 mv(from, to) 383 char *from, *to; 384 { 385 char buf[MAXPATHLEN]; 386 387 if (rename(from, to)) { 388 int sverrno = errno; 389 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 390 errno = sverrno; 391 error(buf); 392 } 393 } 394 395 void 396 error(name) 397 char *name; 398 { 399 400 warn(name); 401 cleanup(); 402 exit(1); 403 } 404 405 void 406 cleanup() 407 { 408 char buf[MAXPATHLEN]; 409 410 switch(clean) { 411 case FILE_ORIG: 412 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 413 (void)unlink(buf); 414 /* FALLTHROUGH */ 415 case FILE_SECURE: 416 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_SMP_DB); 417 (void)unlink(buf); 418 /* FALLTHROUGH */ 419 case FILE_INSECURE: 420 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_MP_DB); 421 (void)unlink(buf); 422 } 423 } 424 425 void 426 usage() 427 { 428 429 (void)fprintf(stderr, "usage: pwd_mkdb [-p] file\n"); 430 exit(1); 431 } 432
Indexes created Tue Sep 30 17:09:57 GMT 2025