pwd_mkdb.c revision 33413
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 const 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#if 0 42static char sccsid[] = "@(#)pwd_mkdb.c 8.5 (Berkeley) 4/20/94"; 43#endif 44static const char rcsid[] = 45 "$Id: pwd_mkdb.c,v 1.21 1998/01/10 17:27:28 wosch Exp $"; 46#endif /* not lint */ 47 48#include <sys/param.h> 49#include <sys/stat.h> 50 51#include <db.h> 52#include <err.h> 53#include <errno.h> 54#include <fcntl.h> 55#include <limits.h> 56#include <pwd.h> 57#include <signal.h> 58#include <stdio.h> 59#include <stdlib.h> 60#include <string.h> 61#include <unistd.h> 62 63#include "pw_scan.h" 64 65#define INSECURE 1 66#define SECURE 2 67#define PERM_INSECURE (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) 68#define PERM_SECURE (S_IRUSR|S_IWUSR) 69 70HASHINFO openinfo = { 71 4096, /* bsize */ 72 32, /* ffactor */ 73 256, /* nelem */ 74 2048 * 1024, /* cachesize */ 75 NULL, /* hash() */ 76 0 /* lorder */ 77}; 78 79static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean; 80static struct passwd pwd; /* password structure */ 81static char *pname; /* password file name */ 82static char prefix[MAXPATHLEN]; 83 84static int Cflag; /* flag for comments */ 85static char line[LINE_MAX]; 86 87void cleanup __P((void)); 88void error __P((char *)); 89void cp __P((char *, char *, mode_t mode)); 90void mv __P((char *, char *)); 91int scan __P((FILE *, struct passwd *)); 92static void usage __P((void)); 93 94int 95main(argc, argv) 96 int argc; 97 char *argv[]; 98{ 99 DB *dp, *sdp, *pw_db; 100 DBT data, sdata, key; 101 FILE *fp, *oldfp; 102 sigset_t set; 103 int ch, cnt, ypcnt, len, makeold, tfd, yp_enabled = 0; 104 char *p, *t; 105 char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024]; 106 char sbuf[MAX(MAXPATHLEN, LINE_MAX * 2)]; 107 char buf2[MAXPATHLEN]; 108 char sbuf2[MAXPATHLEN]; 109 char *username; 110 u_int method, methoduid; 111 int Cflag; 112 113 Cflag = 0; 114 strcpy(prefix, _PATH_PWD); 115 makeold = 0; 116 username = NULL; 117 while ((ch = getopt(argc, argv, "Cd:pu:v")) != -1) 118 switch(ch) { 119 case 'C': /* verify only */ 120 Cflag = 1; 121 break; 122 case 'd': 123 strncpy(prefix, optarg, sizeof prefix - 1); 124 break; 125 case 'p': /* create V7 "file.orig" */ 126 makeold = 1; 127 break; 128 case 'u': /* only update this record */ 129 username = optarg; 130 break; 131 case 'v': /* backward compatible */ 132 break; 133 default: 134 usage(); 135 } 136 argc -= optind; 137 argv += optind; 138 139 if (argc != 1 || (username && (*username == '+' || *username == '-'))) 140 usage(); 141 142 /* 143 * This could be changed to allow the user to interrupt. 144 * Probably not worth the effort. 145 */ 146 sigemptyset(&set); 147 sigaddset(&set, SIGTSTP); 148 sigaddset(&set, SIGHUP); 149 sigaddset(&set, SIGINT); 150 sigaddset(&set, SIGQUIT); 151 sigaddset(&set, SIGTERM); 152 (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL); 153 154 /* We don't care what the user wants. */ 155 (void)umask(0); 156 157 pname = *argv; 158 /* Open the original password file */ 159 if (!(fp = fopen(pname, "r"))) 160 error(pname); 161 162 /* check only if password database is valid */ 163 if (Cflag) { 164 for (cnt = 1; scan(fp, &pwd); ++cnt); 165 exit(0); 166 } 167 168 /* Open the temporary insecure password database. */ 169 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 170 (void)snprintf(sbuf, sizeof(sbuf), "%s/%s.tmp", prefix, _SMP_DB); 171 if (username) { 172 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 173 (void)snprintf(sbuf2, sizeof(sbuf2), "%s/%s", prefix, _SMP_DB); 174 175 clean = FILE_INSECURE; 176 cp(buf2, buf, PERM_INSECURE); 177 dp = dbopen(buf, 178 O_RDWR|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 179 if (dp == NULL) 180 error(buf); 181 182 clean = FILE_SECURE; 183 cp(sbuf2, sbuf, PERM_SECURE); 184 sdp = dbopen(sbuf, 185 O_RDWR|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 186 if (sdp == NULL) 187 error(sbuf); 188 189 /* 190 * Do some trouble to check if we should store this users 191 * uid. Don't use getpwnam/getpwuid as that interferes 192 * with NIS. 193 */ 194 pw_db = dbopen(_PATH_MP_DB, O_RDONLY, 0, DB_HASH, NULL); 195 if (!pw_db) 196 error(_MP_DB); 197 buf[0] = _PW_KEYBYNAME; 198 len = strlen(username); 199 200 /* Only check that username fits in buffer */ 201 memmove(buf + 1, username, MIN(len, sizeof(buf) - 1)); 202 key.data = (u_char *)buf; 203 key.size = len + 1; 204 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) { 205 p = (char *)data.data; 206 207 /* jump over pw_name and pw_passwd, to get to pw_uid */ 208 while (*p++) 209 ; 210 while (*p++) 211 ; 212 213 buf[0] = _PW_KEYBYUID; 214 memmove(buf + 1, p, sizeof(int)); 215 key.data = (u_char *)buf; 216 key.size = sizeof(int) + 1; 217 218 if ((pw_db->get)(pw_db, &key, &data, 0) == 0) { 219 /* First field of data.data holds pw_pwname */ 220 if (!strcmp(data.data, username)) 221 methoduid = 0; 222 else 223 methoduid = R_NOOVERWRITE; 224 } else { 225 methoduid = R_NOOVERWRITE; 226 } 227 } else { 228 methoduid = R_NOOVERWRITE; 229 } 230 if ((pw_db->close)(pw_db)) 231 error("close pw_db"); 232 method = 0; 233 } else { 234 dp = dbopen(buf, 235 O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 236 if (dp == NULL) 237 error(buf); 238 clean = FILE_INSECURE; 239 240 sdp = dbopen(sbuf, 241 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 242 if (sdp == NULL) 243 error(sbuf); 244 clean = FILE_SECURE; 245 246 method = R_NOOVERWRITE; 247 methoduid = R_NOOVERWRITE; 248 } 249 250 /* 251 * Open file for old password file. Minor trickiness -- don't want to 252 * chance the file already existing, since someone (stupidly) might 253 * still be using this for permission checking. So, open it first and 254 * fdopen the resulting fd. The resulting file should be readable by 255 * everyone. 256 */ 257 if (makeold) { 258 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 259 if ((tfd = open(buf, 260 O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0) 261 error(buf); 262 if ((oldfp = fdopen(tfd, "w")) == NULL) 263 error(buf); 264 clean = FILE_ORIG; 265 } 266 267 /* 268 * The databases actually contain three copies of the original data. 269 * Each password file entry is converted into a rough approximation 270 * of a ``struct passwd'', with the strings placed inline. This 271 * object is then stored as the data for three separate keys. The 272 * first key * is the pw_name field prepended by the _PW_KEYBYNAME 273 * character. The second key is the pw_uid field prepended by the 274 * _PW_KEYBYUID character. The third key is the line number in the 275 * original file prepended by the _PW_KEYBYNUM character. (The special 276 * characters are prepended to ensure that the keys do not collide.) 277 */ 278 ypcnt = 1; 279 data.data = (u_char *)buf; 280 sdata.data = (u_char *)sbuf; 281 key.data = (u_char *)tbuf; 282 for (cnt = 1; scan(fp, &pwd); ++cnt) { 283 if (!Cflag && 284 (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-')) 285 yp_enabled = 1; 286#define COMPACT(e) t = e; while ((*p++ = *t++)); 287 if (!Cflag && 288 (!username || (strcmp(username, pwd.pw_name) == 0))) { 289 /* Create insecure data. */ 290 p = buf; 291 COMPACT(pwd.pw_name); 292 COMPACT("*"); 293 memmove(p, &pwd.pw_uid, sizeof(int)); 294 p += sizeof(int); 295 memmove(p, &pwd.pw_gid, sizeof(int)); 296 p += sizeof(int); 297 memmove(p, &pwd.pw_change, sizeof(time_t)); 298 p += sizeof(time_t); 299 COMPACT(pwd.pw_class); 300 COMPACT(pwd.pw_gecos); 301 COMPACT(pwd.pw_dir); 302 COMPACT(pwd.pw_shell); 303 memmove(p, &pwd.pw_expire, sizeof(time_t)); 304 p += sizeof(time_t); 305 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 306 p += sizeof pwd.pw_fields; 307 data.size = p - buf; 308 309 /* Create secure data. */ 310 p = sbuf; 311 COMPACT(pwd.pw_name); 312 COMPACT(pwd.pw_passwd); 313 memmove(p, &pwd.pw_uid, sizeof(int)); 314 p += sizeof(int); 315 memmove(p, &pwd.pw_gid, sizeof(int)); 316 p += sizeof(int); 317 memmove(p, &pwd.pw_change, sizeof(time_t)); 318 p += sizeof(time_t); 319 COMPACT(pwd.pw_class); 320 COMPACT(pwd.pw_gecos); 321 COMPACT(pwd.pw_dir); 322 COMPACT(pwd.pw_shell); 323 memmove(p, &pwd.pw_expire, sizeof(time_t)); 324 p += sizeof(time_t); 325 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 326 p += sizeof pwd.pw_fields; 327 sdata.size = p - sbuf; 328 329 /* Store insecure by name. */ 330 tbuf[0] = _PW_KEYBYNAME; 331 len = strlen(pwd.pw_name); 332 memmove(tbuf + 1, pwd.pw_name, len); 333 key.size = len + 1; 334 if ((dp->put)(dp, &key, &data, method) == -1) 335 error("put"); 336 337 /* Store insecure by number. */ 338 tbuf[0] = _PW_KEYBYNUM; 339 memmove(tbuf + 1, &cnt, sizeof(cnt)); 340 key.size = sizeof(cnt) + 1; 341 if ((dp->put)(dp, &key, &data, method) == -1) 342 error("put"); 343 344 /* Store insecure by uid. */ 345 tbuf[0] = _PW_KEYBYUID; 346 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 347 key.size = sizeof(pwd.pw_uid) + 1; 348 if ((dp->put)(dp, &key, &data, methoduid) == -1) 349 error("put"); 350 351 /* Store secure by name. */ 352 tbuf[0] = _PW_KEYBYNAME; 353 len = strlen(pwd.pw_name); 354 memmove(tbuf + 1, pwd.pw_name, len); 355 key.size = len + 1; 356 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 357 error("put"); 358 359 /* Store secure by number. */ 360 tbuf[0] = _PW_KEYBYNUM; 361 memmove(tbuf + 1, &cnt, sizeof(cnt)); 362 key.size = sizeof(cnt) + 1; 363 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 364 error("put"); 365 366 /* Store secure by uid. */ 367 tbuf[0] = _PW_KEYBYUID; 368 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 369 key.size = sizeof(pwd.pw_uid) + 1; 370 if ((sdp->put)(sdp, &key, &sdata, methoduid) == -1) 371 error("put"); 372 373 /* Store insecure and secure special plus and special minus */ 374 if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-') { 375 tbuf[0] = _PW_KEYYPBYNUM; 376 memmove(tbuf + 1, &ypcnt, sizeof(cnt)); 377 ypcnt++; 378 key.size = sizeof(cnt) + 1; 379 if ((dp->put)(dp, &key, &data, method) == -1) 380 error("put"); 381 if ((sdp->put)(sdp, &key, &sdata, method) == -1) 382 error("put"); 383 } 384 } 385 /* Create original format password file entry */ 386 if (Cflag && makeold) /* copy comments */ 387 if (fprintf(oldfp, "%s\n", line) == EOF) 388 error("write old"); 389 else if (makeold) { 390 char uidstr[20]; 391 char gidstr[20]; 392 393 snprintf(uidstr, sizeof(uidstr), "%d", pwd.pw_uid); 394 snprintf(gidstr, sizeof(gidstr), "%d", pwd.pw_gid); 395 396 if (fprintf(oldfp, "%s:*:%s:%s:%s:%s:%s\n", 397 pwd.pw_name, pwd.pw_fields & _PWF_UID ? uidstr : "", 398 pwd.pw_fields & _PWF_GID ? gidstr : "", 399 pwd.pw_gecos, pwd.pw_dir, pwd.pw_shell) == EOF) 400 error("write old"); 401 } 402 } 403 /* If YP enabled, set flag. */ 404 if (yp_enabled) { 405 buf[0] = yp_enabled + 2; 406 data.size = 1; 407 tbuf[0] = _PW_KEYYPENABLED; 408 key.size = 1; 409 if ((dp->put)(dp, &key, &data, method) == -1) 410 error("put"); 411 if ((sdp->put)(sdp, &key, &data, method) == -1) 412 error("put"); 413 } 414 415 if ((dp->close)(dp) == -1) 416 error("close"); 417 if ((sdp->close)(sdp) == -1) 418 error("close"); 419 if (makeold) { 420 (void)fflush(oldfp); 421 if (fclose(oldfp) == EOF) 422 error("close old"); 423 } 424 425 /* Set master.passwd permissions, in case caller forgot. */ 426 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 427 if (fclose(fp) == EOF) 428 error("close fp"); 429 430 /* Install as the real password files. */ 431 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 432 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 433 mv(buf, buf2); 434 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 435 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB); 436 mv(buf, buf2); 437 if (makeold) { 438 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD); 439 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 440 mv(buf, buf2); 441 } 442 /* 443 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 444 * all use flock(2) on it to block other incarnations of themselves. 445 * The rename means that everything is unlocked, as the original file 446 * can no longer be accessed. 447 */ 448 (void)snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD); 449 mv(pname, buf); 450 exit(0); 451} 452 453int 454scan(fp, pw) 455 FILE *fp; 456 struct passwd *pw; 457{ 458 static int lcnt; 459 char *p; 460 461 if (!fgets(line, sizeof(line), fp)) 462 return (0); 463 ++lcnt; 464 /* 465 * ``... if I swallow anything evil, put your fingers down my 466 * throat...'' 467 * -- The Who 468 */ 469 if (!(p = strchr(line, '\n'))) { 470 warnx("line too long"); 471 goto fmt; 472 473 } 474 *p = '\0'; 475 476#ifdef PASSWD_IGNORE_COMMENTS 477 /* 478 * Ignore comments: ^[ \t]*# 479 */ 480 for (p = line; *p != '\0'; p++) 481 if (*p != ' ' && *p != '\t') 482 break; 483 if (*p == '#' || *p == '\0') { 484 Cflag = 1; 485 return(1); 486 } else 487 Cflag = 0; 488#endif 489 490 if (!pw_scan(line, pw)) { 491 warnx("at line #%d", lcnt); 492fmt: errno = EFTYPE; /* XXX */ 493 error(pname); 494 } 495 496 return (1); 497} 498 499void 500cp(from, to, mode) 501 char *from, *to; 502 mode_t mode; 503{ 504 static char buf[MAXBSIZE]; 505 int from_fd, rcount, to_fd, wcount; 506 507 if ((from_fd = open(from, O_RDONLY, 0)) < 0) 508 error(from); 509 if ((to_fd = open(to, O_WRONLY|O_CREAT|O_EXCL, mode)) < 0) 510 error(to); 511 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 512 wcount = write(to_fd, buf, rcount); 513 if (rcount != wcount || wcount == -1) { 514 int sverrno = errno; 515 516 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 517 errno = sverrno; 518 error(buf); 519 } 520 } 521 if (rcount < 0) { 522 int sverrno = errno; 523 524 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 525 errno = sverrno; 526 error(buf); 527 } 528} 529 530 531void 532mv(from, to) 533 char *from, *to; 534{ 535 char buf[MAXPATHLEN]; 536 537 if (rename(from, to)) { 538 int sverrno = errno; 539 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 540 errno = sverrno; 541 error(buf); 542 } 543} 544 545void 546error(name) 547 char *name; 548{ 549 550 warn("%s", name); 551 cleanup(); 552 exit(1); 553} 554 555void 556cleanup() 557{ 558 char buf[MAXPATHLEN]; 559 560 switch(clean) { 561 case FILE_ORIG: 562 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 563 (void)unlink(buf); 564 /* FALLTHROUGH */ 565 case FILE_SECURE: 566 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 567 (void)unlink(buf); 568 /* FALLTHROUGH */ 569 case FILE_INSECURE: 570 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 571 (void)unlink(buf); 572 } 573} 574 575static void 576usage() 577{ 578 579 (void)fprintf(stderr, 580"usage: pwd_mkdb [-c] [-p] [-d <dest dir>] [-u <local username>] file\n"); 581 exit(1); 582} 583