pwd_mkdb.c revision 15268
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 35static 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 41static 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 66HASHINFO openinfo = { 67 4096, /* bsize */ 68 32, /* ffactor */ 69 256, /* nelem */ 70 2048 * 1024, /* cachesize */ 71 NULL, /* hash() */ 72 0 /* lorder */ 73}; 74 75static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean; 76static struct passwd pwd; /* password structure */ 77static char *pname; /* password file name */ 78static char prefix[MAXPATHLEN]; 79 80void cleanup __P((void)); 81void error __P((char *)); 82void mv __P((char *, char *)); 83int scan __P((FILE *, struct passwd *)); 84void usage __P((void)); 85 86int 87main(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, ypcnt, 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 ypcnt = 1; 179 data.data = (u_char *)buf; 180 key.data = (u_char *)tbuf; 181 for (cnt = 1; scan(fp, &pwd); ++cnt) { 182 if(pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') 183 yp_enabled = 1; 184#define COMPACT(e) t = e; while (*p++ = *t++); 185 /* Create insecure data. */ 186 p = buf; 187 COMPACT(pwd.pw_name); 188 COMPACT("*"); 189 memmove(p, &pwd.pw_uid, sizeof(int)); 190 p += sizeof(int); 191 memmove(p, &pwd.pw_gid, sizeof(int)); 192 p += sizeof(int); 193 memmove(p, &pwd.pw_change, sizeof(time_t)); 194 p += sizeof(time_t); 195 COMPACT(pwd.pw_class); 196 COMPACT(pwd.pw_gecos); 197 COMPACT(pwd.pw_dir); 198 COMPACT(pwd.pw_shell); 199 memmove(p, &pwd.pw_expire, sizeof(time_t)); 200 p += sizeof(time_t); 201 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 202 p += sizeof pwd.pw_fields; 203 data.size = p - buf; 204 205 /* Store insecure by name. */ 206 tbuf[0] = _PW_KEYBYNAME; 207 len = strlen(pwd.pw_name); 208 memmove(tbuf + 1, pwd.pw_name, len); 209 key.size = len + 1; 210 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 211 error("put"); 212 213 /* Store insecure by number. */ 214 tbuf[0] = _PW_KEYBYNUM; 215 memmove(tbuf + 1, &cnt, sizeof(cnt)); 216 key.size = sizeof(cnt) + 1; 217 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 218 error("put"); 219 220 /* Store insecure by uid. */ 221 tbuf[0] = _PW_KEYBYUID; 222 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 223 key.size = sizeof(pwd.pw_uid) + 1; 224 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 225 error("put"); 226 227 /* Store insecure special plus and special minus */ 228 if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') { 229 tbuf[0] = _PW_KEYYPBYNUM; 230 memmove(tbuf + 1, &ypcnt, sizeof(cnt)); 231 ypcnt++; 232 key.size = sizeof(cnt) + 1; 233 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 234 error("put"); 235 } 236 237 /* Create original format password file entry */ 238 if (makeold) 239 (void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n", 240 pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos, 241 pwd.pw_dir, pwd.pw_shell); 242 } 243 /* If YP enabled, set flag. */ 244 if(yp_enabled) { 245 buf[0] = yp_enabled + 2; 246 data.size = 1; 247 tbuf[0] = _PW_KEYYPENABLED; 248 key.size = 1; 249 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 250 error("put"); 251 } 252 253 (void)(dp->close)(dp); 254 if (makeold) { 255 (void)fflush(oldfp); 256 (void)fclose(oldfp); 257 } 258 259 /* Open the temporary encrypted password database. */ 260 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 261 edp = dbopen(buf, 262 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 263 if (!edp) 264 error(buf); 265 clean = FILE_SECURE; 266 267 rewind(fp); 268 ypcnt = 1; 269 for (cnt = 1; scan(fp, &pwd); ++cnt) { 270 271 /* Create secure data. */ 272 p = buf; 273 COMPACT(pwd.pw_name); 274 COMPACT(pwd.pw_passwd); 275 memmove(p, &pwd.pw_uid, sizeof(int)); 276 p += sizeof(int); 277 memmove(p, &pwd.pw_gid, sizeof(int)); 278 p += sizeof(int); 279 memmove(p, &pwd.pw_change, sizeof(time_t)); 280 p += sizeof(time_t); 281 COMPACT(pwd.pw_class); 282 COMPACT(pwd.pw_gecos); 283 COMPACT(pwd.pw_dir); 284 COMPACT(pwd.pw_shell); 285 memmove(p, &pwd.pw_expire, sizeof(time_t)); 286 p += sizeof(time_t); 287 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 288 p += sizeof pwd.pw_fields; 289 data.size = p - buf; 290 291 /* Store secure by name. */ 292 tbuf[0] = _PW_KEYBYNAME; 293 len = strlen(pwd.pw_name); 294 memmove(tbuf + 1, pwd.pw_name, len); 295 key.size = len + 1; 296 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 297 error("put"); 298 299 /* Store secure by number. */ 300 tbuf[0] = _PW_KEYBYNUM; 301 memmove(tbuf + 1, &cnt, sizeof(cnt)); 302 key.size = sizeof(cnt) + 1; 303 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 304 error("put"); 305 306 /* Store secure by uid. */ 307 tbuf[0] = _PW_KEYBYUID; 308 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 309 key.size = sizeof(pwd.pw_uid) + 1; 310 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 311 error("put"); 312 313 /* Store secure special plus and special minus */ 314 if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') { 315 tbuf[0] = _PW_KEYYPBYNUM; 316 memmove(tbuf + 1, &ypcnt, sizeof(ypcnt)); 317 ypcnt++; 318 key.size = sizeof(ypcnt) + 1; 319 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 320 error("put"); 321 } 322 } 323 /* If YP enabled, set flag. */ 324 if(yp_enabled) { 325 buf[0] = yp_enabled + 2; 326 data.size = 1; 327 tbuf[0] = _PW_KEYYPENABLED; 328 key.size = 1; 329 if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 330 error("put"); 331 } 332 333 (void)(edp->close)(edp); 334 335 /* Set master.passwd permissions, in case caller forgot. */ 336 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 337 (void)fclose(fp); 338 339 /* Install as the real password files. */ 340 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 341 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 342 mv(buf, buf2); 343 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 344 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB); 345 mv(buf, buf2); 346 if (makeold) { 347 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD); 348 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 349 mv(buf, buf2); 350 } 351 /* 352 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 353 * all use flock(2) on it to block other incarnations of themselves. 354 * The rename means that everything is unlocked, as the original file 355 * can no longer be accessed. 356 */ 357 (void)snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD); 358 mv(pname, buf); 359 exit(0); 360} 361 362int 363scan(fp, pw) 364 FILE *fp; 365 struct passwd *pw; 366{ 367 static int lcnt; 368 static char line[LINE_MAX]; 369 char *p; 370 371 if (!fgets(line, sizeof(line), fp)) 372 return (0); 373 ++lcnt; 374 /* 375 * ``... if I swallow anything evil, put your fingers down my 376 * throat...'' 377 * -- The Who 378 */ 379 if (!(p = strchr(line, '\n'))) { 380 warnx("line too long"); 381 goto fmt; 382 383 } 384 *p = '\0'; 385 if (!pw_scan(line, pw)) { 386 warnx("at line #%d", lcnt); 387fmt: errno = EFTYPE; /* XXX */ 388 error(pname); 389 } 390 391 return (1); 392} 393 394void 395mv(from, to) 396 char *from, *to; 397{ 398 char buf[MAXPATHLEN]; 399 400 if (rename(from, to)) { 401 int sverrno = errno; 402 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 403 errno = sverrno; 404 error(buf); 405 } 406} 407 408void 409error(name) 410 char *name; 411{ 412 413 warn(name); 414 cleanup(); 415 exit(1); 416} 417 418void 419cleanup() 420{ 421 char buf[MAXPATHLEN]; 422 423 switch(clean) { 424 case FILE_ORIG: 425 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 426 (void)unlink(buf); 427 /* FALLTHROUGH */ 428 case FILE_SECURE: 429 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 430 (void)unlink(buf); 431 /* FALLTHROUGH */ 432 case FILE_INSECURE: 433 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 434 (void)unlink(buf); 435 } 436} 437 438void 439usage() 440{ 441 442 (void)fprintf(stderr, "usage: pwd_mkdb [-p] [-d <dest dir>] file\n"); 443 exit(1); 444} 445