1 /*- 2 * Copyright (c) 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char copyright[] = 36 "@(#) Copyright (c) 1991, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)pwd_mkdb.c 8.5 (Berkeley) 4/20/94"; 42 #endif /* not lint */ 43 44 #include <sys/param.h> 45 #include <sys/stat.h> 46 47 #include <db.h> 48 #include <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <limits.h> 52 #include <pwd.h> 53 #include <signal.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 59 #include "pw_scan.h" 60 61 #define INSECURE 1 62 #define SECURE 2 63 #define PERM_INSECURE (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) 64 #define PERM_SECURE (S_IRUSR|S_IWUSR) 65 66 HASHINFO openinfo = { 67 4096, /* bsize */ 68 32, /* ffactor */ 69 256, /* nelem */ 70 2048 * 1024, /* cachesize */ 71 NULL, /* hash() */ 72 0 /* lorder */ 73 }; 74 75 static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean; 76 static struct passwd pwd; /* password structure */ 77 static char *pname; /* password file name */ 78 static char prefix[MAXPATHLEN]; 79 80 void cleanup __P((void)); 81 void error __P((char *)); 82 void mv __P((char *, char *)); 83 int scan __P((FILE *, struct passwd *)); 84 void usage __P((void)); 85 86 int 87 main(argc, argv) 88 int argc; 89 char *argv[]; 90 { 91 DB *dp, *edp; 92 DBT data, key; 93 FILE *fp, *oldfp; 94 sigset_t set; 95 int ch, cnt, len, makeold, tfd, yp_enabled = 0; 96 char *p, *t; 97 char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024]; 98 char buf2[MAXPATHLEN]; 99 100 strcpy(prefix, _PATH_PWD); 101 makeold = 0; 102 while ((ch = getopt(argc, argv, "d:pv")) != EOF) 103 switch(ch) { 104 case 'd': 105 strcpy(prefix, optarg); 106 break; 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/%s.tmp", prefix, _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 data.data = (u_char *)buf; 179 key.data = (u_char *)tbuf; 180 for (cnt = 1; scan(fp, &pwd); ++cnt) { 181 if(pwd.pw_name[0] == '+') { 182 if(pwd.pw_name[1] && !yp_enabled) { 183 yp_enabled = 1; 184 } else if(!pwd.pw_name[1]) { 185 yp_enabled = -1; 186 } 187 } 188 #define COMPACT(e) t = e; while (*p++ = *t++); 189 /* Create insecure data. */ 190 p = buf; 191 COMPACT(pwd.pw_name); 192 COMPACT("*"); 193 memmove(p, &pwd.pw_uid, sizeof(int)); 194 p += sizeof(int); 195 memmove(p, &pwd.pw_gid, sizeof(int)); 196 p += sizeof(int); 197 memmove(p, &pwd.pw_change, sizeof(time_t)); 198 p += sizeof(time_t); 199 COMPACT(pwd.pw_class); 200 COMPACT(pwd.pw_gecos); 201 COMPACT(pwd.pw_dir); 202 COMPACT(pwd.pw_shell); 203 memmove(p, &pwd.pw_expire, sizeof(time_t)); 204 p += sizeof(time_t); 205 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 206 p += sizeof pwd.pw_fields; 207 data.size = p - buf; 208 209 /* Store insecure by name. */ 210 tbuf[0] = _PW_KEYBYNAME; 211 len = strlen(pwd.pw_name); 212 memmove(tbuf + 1, pwd.pw_name, len); 213 key.size = len + 1; 214 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 215 error("put"); 216 217 /* Store insecure by number. */ 218 tbuf[0] = _PW_KEYBYNUM; 219 memmove(tbuf + 1, &cnt, sizeof(cnt)); 220 key.size = sizeof(cnt) + 1; 221 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 222 error("put"); 223 224 /* Store insecure by uid. */ 225 tbuf[0] = _PW_KEYBYUID; 226 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 227 key.size = sizeof(pwd.pw_uid) + 1; 228 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 229 error("put"); 230 231 /* Create original format password file entry */ 232 if (makeold) 233 (void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n", 234 pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos, 235 pwd.pw_dir, pwd.pw_shell); 236 } 237 /* If YP enabled, set flag. */ 238 if(yp_enabled) { 239 buf[0] = yp_enabled + 2; 240 data.size = 1; 241 tbuf[0] = _PW_KEYYPENABLED; 242 key.size = 1; 243 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 244 error("put"); 245 } 246 247 (void)(dp->close)(dp); 248 if (makeold) { 249 (void)fflush(oldfp); 250 (void)fclose(oldfp); 251 } 252 253 /* Open the temporary encrypted password database. */ 254 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 255 edp = dbopen(buf, 256 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 257 if (!edp) 258 error(buf); 259 clean = FILE_SECURE; 260 261 rewind(fp); 262 for (cnt = 1; scan(fp, &pwd); ++cnt) { 263 264 /* Create secure data. */ 265 p = buf; 266 COMPACT(pwd.pw_name); 267 COMPACT(pwd.pw_passwd); 268 memmove(p, &pwd.pw_uid, sizeof(int)); 269 p += sizeof(int); 270 memmove(p, &pwd.pw_gid, sizeof(int)); 271 p += sizeof(int); 272 memmove(p, &pwd.pw_change, sizeof(time_t)); 273 p += sizeof(time_t); 274 COMPACT(pwd.pw_class); 275 COMPACT(pwd.pw_gecos); 276 COMPACT(pwd.pw_dir); 277 COMPACT(pwd.pw_shell); 278 memmove(p, &pwd.pw_expire, sizeof(time_t)); 279 p += sizeof(time_t); 280 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 281 p += sizeof pwd.pw_fields; 282 data.size = p - buf; 283 284 /* Store secure by name. */ 285 tbuf[0] = _PW_KEYBYNAME; 286 len = strlen(pwd.pw_name); 287 memmove(tbuf + 1, pwd.pw_name, len); 288 key.size = len + 1; 289 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 290 error("put"); 291 292 /* Store secure by number. */ 293 tbuf[0] = _PW_KEYBYNUM; 294 memmove(tbuf + 1, &cnt, sizeof(cnt)); 295 key.size = sizeof(cnt) + 1; 296 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 297 error("put"); 298 299 /* Store secure by uid. */ 300 tbuf[0] = _PW_KEYBYUID; 301 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 302 key.size = sizeof(pwd.pw_uid) + 1; 303 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 304 error("put"); 305 } 306 /* If YP enabled, set flag. */ 307 if(yp_enabled) { 308 buf[0] = yp_enabled + 2; 309 data.size = 1; 310 tbuf[0] = _PW_KEYYPENABLED; 311 key.size = 1; 312 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 313 error("put"); 314 } 315 316 (void)(edp->close)(edp); 317 318 /* Set master.passwd permissions, in case caller forgot. */ 319 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 320 (void)fclose(fp); 321 322 /* Install as the real password files. */ 323 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 324 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 325 mv(buf, buf2); 326 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 327 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB); 328 mv(buf, buf2); 329 if (makeold) { 330 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD); 331 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 332 mv(buf, buf2); 333 } 334 /* 335 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 336 * all use flock(2) on it to block other incarnations of themselves. 337 * The rename means that everything is unlocked, as the original file 338 * can no longer be accessed. 339 */ 340 (void)snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD); 341 mv(pname, buf); 342 exit(0); 343 } 344 345 int 346 scan(fp, pw) 347 FILE *fp; 348 struct passwd *pw; 349 { 350 static int lcnt; 351 static char line[LINE_MAX]; 352 char *p; 353 354 if (!fgets(line, sizeof(line), fp)) 355 return (0); 356 ++lcnt; 357 /* 358 * ``... if I swallow anything evil, put your fingers down my 359 * throat...'' 360 * -- The Who 361 */ 362 if (!(p = strchr(line, '\n'))) { 363 warnx("line too long"); 364 goto fmt; 365 366 } 367 *p = '\0'; 368 if (!pw_scan(line, pw)) { 369 warnx("at line #%d", lcnt); 370 fmt: errno = EFTYPE; /* XXX */ 371 error(pname); 372 } 373 374 return (1); 375 } 376 377 void 378 mv(from, to) 379 char *from, *to; 380 { 381 char buf[MAXPATHLEN]; 382 383 if (rename(from, to)) { 384 int sverrno = errno; 385 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 386 errno = sverrno; 387 error(buf); 388 } 389 } 390 391 void 392 error(name) 393 char *name; 394 { 395 396 warn(name); 397 cleanup(); 398 exit(1); 399 } 400 401 void 402 cleanup() 403 { 404 char buf[MAXPATHLEN]; 405 406 switch(clean) { 407 case FILE_ORIG: 408 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 409 (void)unlink(buf); 410 /* FALLTHROUGH */ 411 case FILE_SECURE: 412 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 413 (void)unlink(buf); 414 /* FALLTHROUGH */ 415 case FILE_INSECURE: 416 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 417 (void)unlink(buf); 418 } 419 } 420 421 void 422 usage() 423 { 424 425 (void)fprintf(stderr, "usage: pwd_mkdb [-p] [-d <dest dir>] file\n"); 426 exit(1); 427 } 428