pwd_mkdb.c revision 1.5
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[] = "from: @(#)pwd_mkdb.c 8.5 (Berkeley) 4/20/94";*/ 42 static char *rcsid = "$Id: pwd_mkdb.c,v 1.5 1994/08/28 23:32:54 mycroft Exp $"; 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <sys/stat.h> 47 48 #include <db.h> 49 #include <err.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <limits.h> 53 #include <pwd.h> 54 #include <signal.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #include "pw_scan.h" 61 62 #define INSECURE 1 63 #define SECURE 2 64 #define PERM_INSECURE (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) 65 #define PERM_SECURE (S_IRUSR|S_IWUSR) 66 67 HASHINFO openinfo = { 68 4096, /* bsize */ 69 32, /* ffactor */ 70 256, /* nelem */ 71 2048 * 1024, /* cachesize */ 72 NULL, /* hash() */ 73 0 /* lorder */ 74 }; 75 76 static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean; 77 static struct passwd pwd; /* password structure */ 78 static char *pname; /* password file name */ 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; 96 char *p, *t; 97 char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024]; 98 99 makeold = 0; 100 while ((ch = getopt(argc, argv, "pv")) != EOF) 101 switch(ch) { 102 case 'p': /* create V7 "file.orig" */ 103 makeold = 1; 104 break; 105 case 'v': /* backward compatible */ 106 break; 107 case '?': 108 default: 109 usage(); 110 } 111 argc -= optind; 112 argv += optind; 113 114 if (argc != 1) 115 usage(); 116 117 /* 118 * This could be changed to allow the user to interrupt. 119 * Probably not worth the effort. 120 */ 121 sigemptyset(&set); 122 sigaddset(&set, SIGTSTP); 123 sigaddset(&set, SIGHUP); 124 sigaddset(&set, SIGINT); 125 sigaddset(&set, SIGQUIT); 126 sigaddset(&set, SIGTERM); 127 (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL); 128 129 /* We don't care what the user wants. */ 130 (void)umask(0); 131 132 pname = *argv; 133 /* Open the original password file */ 134 if (!(fp = fopen(pname, "r"))) 135 error(pname); 136 137 /* Open the temporary insecure password database. */ 138 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_MP_DB); 139 dp = dbopen(buf, 140 O_RDWR|O_CREAT|O_EXCL, PERM_INSECURE, DB_HASH, &openinfo); 141 if (dp == NULL) 142 error(buf); 143 clean = FILE_INSECURE; 144 145 /* 146 * Open file for old password file. Minor trickiness -- don't want to 147 * chance the file already existing, since someone (stupidly) might 148 * still be using this for permission checking. So, open it first and 149 * fdopen the resulting fd. The resulting file should be readable by 150 * everyone. 151 */ 152 if (makeold) { 153 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 154 if ((tfd = open(buf, 155 O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0) 156 error(buf); 157 if ((oldfp = fdopen(tfd, "w")) == NULL) 158 error(buf); 159 clean = FILE_ORIG; 160 } 161 162 /* 163 * The databases actually contain three copies of the original data. 164 * Each password file entry is converted into a rough approximation 165 * of a ``struct passwd'', with the strings placed inline. This 166 * object is then stored as the data for three separate keys. The 167 * first key * is the pw_name field prepended by the _PW_KEYBYNAME 168 * character. The second key is the pw_uid field prepended by the 169 * _PW_KEYBYUID character. The third key is the line number in the 170 * original file prepended by the _PW_KEYBYNUM character. (The special 171 * characters are prepended to ensure that the keys do not collide.) 172 */ 173 data.data = (u_char *)buf; 174 key.data = (u_char *)tbuf; 175 for (cnt = 1; scan(fp, &pwd); ++cnt) { 176 #define COMPACT(e) t = e; while (*p++ = *t++); 177 /* Create insecure data. */ 178 p = buf; 179 COMPACT(pwd.pw_name); 180 COMPACT("*"); 181 memmove(p, &pwd.pw_uid, sizeof(int)); 182 p += sizeof(int); 183 memmove(p, &pwd.pw_gid, sizeof(int)); 184 p += sizeof(int); 185 memmove(p, &pwd.pw_change, sizeof(time_t)); 186 p += sizeof(time_t); 187 COMPACT(pwd.pw_class); 188 COMPACT(pwd.pw_gecos); 189 COMPACT(pwd.pw_dir); 190 COMPACT(pwd.pw_shell); 191 memmove(p, &pwd.pw_expire, sizeof(time_t)); 192 p += sizeof(time_t); 193 data.size = p - buf; 194 195 /* Store insecure by name. */ 196 tbuf[0] = _PW_KEYBYNAME; 197 len = strlen(pwd.pw_name); 198 memmove(tbuf + 1, pwd.pw_name, len); 199 key.size = len + 1; 200 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 201 error("put"); 202 203 /* Store insecure by number. */ 204 tbuf[0] = _PW_KEYBYNUM; 205 memmove(tbuf + 1, &cnt, sizeof(cnt)); 206 key.size = sizeof(cnt) + 1; 207 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 208 error("put"); 209 210 /* Store insecure by uid. */ 211 tbuf[0] = _PW_KEYBYUID; 212 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 213 key.size = sizeof(pwd.pw_uid) + 1; 214 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 215 error("put"); 216 217 /* Create original format password file entry */ 218 if (makeold) 219 (void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n", 220 pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos, 221 pwd.pw_dir, pwd.pw_shell); 222 } 223 (void)(dp->close)(dp); 224 if (makeold) { 225 (void)fflush(oldfp); 226 (void)fclose(oldfp); 227 } 228 229 /* Open the temporary encrypted password database. */ 230 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_SMP_DB); 231 edp = dbopen(buf, 232 O_RDWR|O_CREAT|O_EXCL, PERM_SECURE, DB_HASH, &openinfo); 233 if (!edp) 234 error(buf); 235 clean = FILE_SECURE; 236 237 rewind(fp); 238 for (cnt = 1; scan(fp, &pwd); ++cnt) { 239 240 /* Create secure data. */ 241 p = buf; 242 COMPACT(pwd.pw_name); 243 COMPACT(pwd.pw_passwd); 244 memmove(p, &pwd.pw_uid, sizeof(int)); 245 p += sizeof(int); 246 memmove(p, &pwd.pw_gid, sizeof(int)); 247 p += sizeof(int); 248 memmove(p, &pwd.pw_change, sizeof(time_t)); 249 p += sizeof(time_t); 250 COMPACT(pwd.pw_class); 251 COMPACT(pwd.pw_gecos); 252 COMPACT(pwd.pw_dir); 253 COMPACT(pwd.pw_shell); 254 memmove(p, &pwd.pw_expire, sizeof(time_t)); 255 p += sizeof(time_t); 256 data.size = p - buf; 257 258 /* Store secure by name. */ 259 tbuf[0] = _PW_KEYBYNAME; 260 len = strlen(pwd.pw_name); 261 memmove(tbuf + 1, pwd.pw_name, len); 262 key.size = len + 1; 263 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 264 error("put"); 265 266 /* Store secure by number. */ 267 tbuf[0] = _PW_KEYBYNUM; 268 memmove(tbuf + 1, &cnt, sizeof(cnt)); 269 key.size = sizeof(cnt) + 1; 270 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 271 error("put"); 272 273 /* Store secure by uid. */ 274 tbuf[0] = _PW_KEYBYUID; 275 memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid)); 276 key.size = sizeof(pwd.pw_uid) + 1; 277 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 278 error("put"); 279 } 280 281 (void)(edp->close)(edp); 282 283 /* Set master.passwd permissions, in case caller forgot. */ 284 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 285 (void)fclose(fp); 286 287 /* Install as the real password files. */ 288 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_MP_DB); 289 mv(buf, _PATH_MP_DB); 290 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_SMP_DB); 291 mv(buf, _PATH_SMP_DB); 292 if (makeold) { 293 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 294 mv(buf, _PATH_PASSWD); 295 } 296 /* 297 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 298 * all use flock(2) on it to block other incarnations of themselves. 299 * The rename means that everything is unlocked, as the original file 300 * can no longer be accessed. 301 */ 302 mv(pname, _PATH_MASTERPASSWD); 303 exit(0); 304 } 305 306 int 307 scan(fp, pw) 308 FILE *fp; 309 struct passwd *pw; 310 { 311 static int lcnt; 312 static char line[LINE_MAX]; 313 char *p; 314 315 if (!fgets(line, sizeof(line), fp)) 316 return (0); 317 ++lcnt; 318 /* 319 * ``... if I swallow anything evil, put your fingers down my 320 * throat...'' 321 * -- The Who 322 */ 323 if (!(p = strchr(line, '\n'))) { 324 warnx("line too long"); 325 goto fmt; 326 327 } 328 *p = '\0'; 329 if (!pw_scan(line, pw)) { 330 warnx("at line #%d", lcnt); 331 fmt: errno = EFTYPE; /* XXX */ 332 error(pname); 333 } 334 335 return (1); 336 } 337 338 void 339 mv(from, to) 340 char *from, *to; 341 { 342 char buf[MAXPATHLEN]; 343 344 if (rename(from, to)) { 345 int sverrno = errno; 346 (void)snprintf(buf, sizeof(buf), "%s to %s", from, to); 347 errno = sverrno; 348 error(buf); 349 } 350 } 351 352 void 353 error(name) 354 char *name; 355 { 356 357 warn(name); 358 cleanup(); 359 exit(1); 360 } 361 362 void 363 cleanup() 364 { 365 char buf[MAXPATHLEN]; 366 367 switch(clean) { 368 case FILE_ORIG: 369 (void)snprintf(buf, sizeof(buf), "%s.orig", pname); 370 (void)unlink(buf); 371 /* FALLTHROUGH */ 372 case FILE_SECURE: 373 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_SMP_DB); 374 (void)unlink(buf); 375 /* FALLTHROUGH */ 376 case FILE_INSECURE: 377 (void)snprintf(buf, sizeof(buf), "%s.tmp", _PATH_MP_DB); 378 (void)unlink(buf); 379 } 380 } 381 382 void 383 usage() 384 { 385 386 (void)fprintf(stderr, "usage: pwd_mkdb [-p] file\n"); 387 exit(1); 388 } 389
Indexes created Tue Sep 30 20:09:53 GMT 2025