pwd_mkdb.c revision 7326
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, pluscnt, minuscnt, 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 minuscnt = pluscnt = 0; 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] = (pwd.pw_name[0] == '+') ? 230 _PW_KEYPLUSBYNUM : _PW_KEYMINUSBYNUM; 231 memmove(tbuf + 1, (pwd.pw_name[0] == '+') ? 232 &pluscnt : &minuscnt, sizeof(cnt)); 233 if (pwd.pw_name[0] == '+') 234 pluscnt++; 235 else 236 minuscnt++; 237 key.size = sizeof(cnt) + 1; 238 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 239 error("put"); 240 } 241 242 /* Create original format password file entry */ 243 if (makeold) 244 (void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n", 245 pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos, 246 pwd.pw_dir, pwd.pw_shell); 247 } 248 /* If YP enabled, set flag. */ 249 if(yp_enabled) { 250 buf[0] = yp_enabled + 2; 251 data.size = 1; 252 tbuf[0] = _PW_KEYYPENABLED; 253 key.size = 1; 254 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 255 error("put"); 256 } 257 /* If we have +@netgroup entries, store the plus counter */ 258 if(pluscnt) { 259 buf[0] = pluscnt; 260 data.size = sizeof(pluscnt); 261 tbuf[0] = _PW_KEYPLUSCNT; 262 key.size = 1; 263 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 264 error("put"); 265 } 266 /* If we have -@netgroup entries, store the minus counter */ 267 if(minuscnt) { 268 buf[0] = minuscnt; 269 data.size = sizeof(minuscnt); 270 tbuf[0] = _PW_KEYMINUSCNT; 271 key.size = 1; 272 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 273 error("put"); 274 } 275 276 (void)(dp->close)(dp); 277 if (makeold) { 278 (void)fflush(oldfp); 279 (void)fclose(oldfp); 280 } 281 282 /* Open the temporary encrypted password database. */ 283 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 284 edp = dbopen(buf, 285 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 286 if (!edp) 287 error(buf); 288 clean = FILE_SECURE; 289 290 rewind(fp); 291 minuscnt = pluscnt = 0; 292 for (cnt = 1; scan(fp, &pwd); ++cnt) { 293 294 /* Create secure data. */ 295 p = buf; 296 COMPACT(pwd.pw_name); 297 COMPACT(pwd.pw_passwd); 298 memmove(p, &pwd.pw_uid, sizeof(int)); 299 p += sizeof(int); 300 memmove(p, &pwd.pw_gid, sizeof(int)); 301 p += sizeof(int); 302 memmove(p, &pwd.pw_change, sizeof(time_t)); 303 p += sizeof(time_t); 304 COMPACT(pwd.pw_class); 305 COMPACT(pwd.pw_gecos); 306 COMPACT(pwd.pw_dir); 307 COMPACT(pwd.pw_shell); 308 memmove(p, &pwd.pw_expire, sizeof(time_t)); 309 p += sizeof(time_t); 310 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 311 p += sizeof pwd.pw_fields; 312 data.size = p - buf; 313 314 /* Store secure by name. */ 315 tbuf[0] = _PW_KEYBYNAME; 316 len = strlen(pwd.pw_name); 317 memmove(tbuf + 1, pwd.pw_name, len); 318 key.size = len + 1; 319 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 320 error("put"); 321 322 /* Store secure by number. */ 323 tbuf[0] = _PW_KEYBYNUM; 324 memmove(tbuf + 1, &cnt, sizeof(cnt)); 325 key.size = sizeof(cnt) + 1; 326 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 327 error("put"); 328 329 /* Store secure by uid. */ 330 tbuf[0] = _PW_KEYBYUID; 331 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 332 key.size = sizeof(pwd.pw_uid) + 1; 333 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 334 error("put"); 335 336 /* Store secure special plus and special minus */ 337 if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') { 338 tbuf[0] = (pwd.pw_name[0] == '+') ? 339 _PW_KEYPLUSBYNUM : _PW_KEYMINUSBYNUM; 340 memmove(tbuf + 1, (pwd.pw_name[0] == '+') ? 341 &pluscnt : &minuscnt, sizeof(cnt)); 342 if (pwd.pw_name[0] == '+') 343 pluscnt++; 344 else 345 minuscnt++; 346 key.size = sizeof(cnt) + 1; 347 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 348 error("put"); 349 } 350 } 351 /* If YP enabled, set flag. */ 352 if(yp_enabled) { 353 buf[0] = yp_enabled + 2; 354 data.size = 1; 355 tbuf[0] = _PW_KEYYPENABLED; 356 key.size = 1; 357 if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 358 error("put"); 359 } 360 /* If we have +@netgroup entries, store the plus counter */ 361 if(pluscnt) { 362 buf[0] = pluscnt; 363 data.size = sizeof(pluscnt); 364 tbuf[0] = _PW_KEYPLUSCNT; 365 key.size = 1; 366 if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 367 error("put"); 368 } 369 /* If we have -@netgroup entries, store the minus counter */ 370 if(minuscnt) { 371 buf[0] = minuscnt; 372 data.size = sizeof(minuscnt); 373 tbuf[0] = _PW_KEYMINUSCNT; 374 key.size = 1; 375 if ((edp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 376 error("put"); 377 } 378 (void)(edp->close)(edp); 379 380 /* Set master.passwd permissions, in case caller forgot. */ 381 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 382 (void)fclose(fp); 383 384 /* Install as the real password files. */ 385 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 386 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 387 mv(buf, buf2); 388 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 389 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB); 390 mv(buf, buf2); 391 if (makeold) { 392 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD); 393 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 394 mv(buf, buf2); 395 } 396 /* 397 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 398 * all use flock(2) on it to block other incarnations of themselves. 399 * The rename means that everything is unlocked, as the original file 400 * can no longer be accessed. 401 */ 402 (void)snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD); 403 mv(pname, buf); 404 exit(0); 405} 406 407int 408scan(fp, pw) 409 FILE *fp; 410 struct passwd *pw; 411{ 412 static int lcnt; 413 static char line[LINE_MAX]; 414 char *p; 415 416 if (!fgets(line, sizeof(line), fp)) 417 return (0); 418 ++lcnt; 419 /* 420 * ``... if I swallow anything evil, put your fingers down my 421 * throat...'' 422 * -- The Who 423 */ 424 if (!(p = strchr(line, '\n'))) { 425 warnx("line too long"); 426 goto fmt; 427 428 } 429 *p = '\0'; 430 if (!pw_scan(line, pw)) { 431 warnx("at line #%d", lcnt); 432fmt: errno = EFTYPE; /* XXX */ 433 error(pname); 434 } 435 436 return (1); 437} 438 439void 440mv(from, to) 441 char *from, *to; 442{ 443 char buf[MAXPATHLEN]; 444 445 if (rename(from, to)) { 446 int sverrno = errno; 447 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 448 errno = sverrno; 449 error(buf); 450 } 451} 452 453void 454error(name) 455 char *name; 456{ 457 458 warn(name); 459 cleanup(); 460 exit(1); 461} 462 463void 464cleanup() 465{ 466 char buf[MAXPATHLEN]; 467 468 switch(clean) { 469 case FILE_ORIG: 470 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 471 (void)unlink(buf); 472 /* FALLTHROUGH */ 473 case FILE_SECURE: 474 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 475 (void)unlink(buf); 476 /* FALLTHROUGH */ 477 case FILE_INSECURE: 478 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 479 (void)unlink(buf); 480 } 481} 482 483void 484usage() 485{ 486 487 (void)fprintf(stderr, "usage: pwd_mkdb [-p] [-d <dest dir>] file\n"); 488 exit(1); 489} 490