pwd_mkdb.c revision 2916
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, 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] == '+') yp_enabled = 1; 182#define COMPACT(e) t = e; while (*p++ = *t++); 183 /* Create insecure data. */ 184 p = buf; 185 COMPACT(pwd.pw_name); 186 COMPACT("*"); 187 memmove(p, &pwd.pw_uid, sizeof(int)); 188 p += sizeof(int); 189 memmove(p, &pwd.pw_gid, sizeof(int)); 190 p += sizeof(int); 191 memmove(p, &pwd.pw_change, sizeof(time_t)); 192 p += sizeof(time_t); 193 COMPACT(pwd.pw_class); 194 COMPACT(pwd.pw_gecos); 195 COMPACT(pwd.pw_dir); 196 COMPACT(pwd.pw_shell); 197 memmove(p, &pwd.pw_expire, sizeof(time_t)); 198 p += sizeof(time_t); 199 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 200 p += sizeof pwd.pw_fields; 201 data.size = p - buf; 202 203 /* Store insecure by name. */ 204 tbuf[0] = _PW_KEYBYNAME; 205 len = strlen(pwd.pw_name); 206 memmove(tbuf + 1, pwd.pw_name, len); 207 key.size = len + 1; 208 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 209 error("put"); 210 211 /* Store insecure by number. */ 212 tbuf[0] = _PW_KEYBYNUM; 213 memmove(tbuf + 1, &cnt, sizeof(cnt)); 214 key.size = sizeof(cnt) + 1; 215 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 216 error("put"); 217 218 /* Store insecure by uid. */ 219 tbuf[0] = _PW_KEYBYUID; 220 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 221 key.size = sizeof(pwd.pw_uid) + 1; 222 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 223 error("put"); 224 225 /* Create original format password file entry */ 226 if (makeold) 227 (void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n", 228 pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos, 229 pwd.pw_dir, pwd.pw_shell); 230 } 231 /* If YP enabled, set flag. */ 232 if(yp_enabled) { 233 tbuf[0] = _PW_KEYYPENABLED; 234 key.size = 1; 235 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 236 error("put"); 237 } 238 239 (void)(dp->close)(dp); 240 if (makeold) { 241 (void)fflush(oldfp); 242 (void)fclose(oldfp); 243 } 244 245 /* Open the temporary encrypted password database. */ 246 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 247 edp = dbopen(buf, 248 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 249 if (!edp) 250 error(buf); 251 clean = FILE_SECURE; 252 253 rewind(fp); 254 for (cnt = 1; scan(fp, &pwd); ++cnt) { 255 256 /* Create secure data. */ 257 p = buf; 258 COMPACT(pwd.pw_name); 259 COMPACT(pwd.pw_passwd); 260 memmove(p, &pwd.pw_uid, sizeof(int)); 261 p += sizeof(int); 262 memmove(p, &pwd.pw_gid, sizeof(int)); 263 p += sizeof(int); 264 memmove(p, &pwd.pw_change, sizeof(time_t)); 265 p += sizeof(time_t); 266 COMPACT(pwd.pw_class); 267 COMPACT(pwd.pw_gecos); 268 COMPACT(pwd.pw_dir); 269 COMPACT(pwd.pw_shell); 270 memmove(p, &pwd.pw_expire, sizeof(time_t)); 271 p += sizeof(time_t); 272 memmove(p, &pwd.pw_fields, sizeof pwd.pw_fields); 273 p += sizeof pwd.pw_fields; 274 data.size = p - buf; 275 276 /* Store secure by name. */ 277 tbuf[0] = _PW_KEYBYNAME; 278 len = strlen(pwd.pw_name); 279 memmove(tbuf + 1, pwd.pw_name, len); 280 key.size = len + 1; 281 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 282 error("put"); 283 284 /* Store secure by number. */ 285 tbuf[0] = _PW_KEYBYNUM; 286 memmove(tbuf + 1, &cnt, sizeof(cnt)); 287 key.size = sizeof(cnt) + 1; 288 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 289 error("put"); 290 291 /* Store secure by uid. */ 292 tbuf[0] = _PW_KEYBYUID; 293 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 294 key.size = sizeof(pwd.pw_uid) + 1; 295 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 296 error("put"); 297 } 298 299 /* If YP enabled, set flag. */ 300 if(yp_enabled) { 301 tbuf[0] = _PW_KEYYPENABLED; 302 key.size = 1; 303 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 304 error("put"); 305 } 306 307 (void)(edp->close)(edp); 308 309 /* Set master.passwd permissions, in case caller forgot. */ 310 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 311 (void)fclose(fp); 312 313 /* Install as the real password files. */ 314 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 315 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _MP_DB); 316 mv(buf, buf2); 317 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 318 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _SMP_DB); 319 mv(buf, buf2); 320 if (makeold) { 321 (void)snprintf(buf2, sizeof(buf2), "%s/%s", prefix, _PASSWD); 322 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 323 mv(buf, buf2); 324 } 325 /* 326 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 327 * all use flock(2) on it to block other incarnations of themselves. 328 * The rename means that everything is unlocked, as the original file 329 * can no longer be accessed. 330 */ 331 (void)snprintf(buf, sizeof(buf), "%s/%s", prefix, _MASTERPASSWD); 332 mv(pname, buf); 333 exit(0); 334} 335 336int 337scan(fp, pw) 338 FILE *fp; 339 struct passwd *pw; 340{ 341 static int lcnt; 342 static char line[LINE_MAX]; 343 char *p; 344 345 if (!fgets(line, sizeof(line), fp)) 346 return (0); 347 ++lcnt; 348 /* 349 * ``... if I swallow anything evil, put your fingers down my 350 * throat...'' 351 * -- The Who 352 */ 353 if (!(p = strchr(line, '\n'))) { 354 warnx("line too long"); 355 goto fmt; 356 357 } 358 *p = '\0'; 359 if (!pw_scan(line, pw)) { 360 warnx("at line #%d", lcnt); 361fmt: errno = EFTYPE; /* XXX */ 362 error(pname); 363 } 364 365 return (1); 366} 367 368void 369mv(from, to) 370 char *from, *to; 371{ 372 char buf[MAXPATHLEN]; 373 374 if (rename(from, to)) { 375 int sverrno = errno; 376 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 377 errno = sverrno; 378 error(buf); 379 } 380} 381 382void 383error(name) 384 char *name; 385{ 386 387 warn(name); 388 cleanup(); 389 exit(1); 390} 391 392void 393cleanup() 394{ 395 char buf[MAXPATHLEN]; 396 397 switch(clean) { 398 case FILE_ORIG: 399 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 400 (void)unlink(buf); 401 /* FALLTHROUGH */ 402 case FILE_SECURE: 403 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _SMP_DB); 404 (void)unlink(buf); 405 /* FALLTHROUGH */ 406 case FILE_INSECURE: 407 (void)snprintf(buf, sizeof(buf), "%s/%s.tmp", prefix, _MP_DB); 408 (void)unlink(buf); 409 } 410} 411 412void 413usage() 414{ 415 416 (void)fprintf(stderr, "usage: pwd_mkdb [-p] [-d <dest dir>] file\n"); 417 exit(1); 418} 419