1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 char copyright[] = 10 "@(#) Copyright (c) 1991 The Regents of the University of California.\n\ 11 All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)pwd_mkdb.c 5.5 (Berkeley) 05/06/91"; 16 #endif /* not lint */ 17 18 #include <sys/param.h> 19 #include <sys/stat.h> 20 #include <signal.h> 21 #include <fcntl.h> 22 #include <db.h> 23 #include <pwd.h> 24 #include <errno.h> 25 #include <limits.h> 26 #include <stdio.h> 27 #include <string.h> 28 29 #define INSECURE 1 30 #define SECURE 2 31 #define PERM_INSECURE (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) 32 #define PERM_SECURE (S_IRUSR|S_IWUSR) 33 34 char *progname = "pwd_mkdb"; 35 36 static enum state { FILE_INSECURE, FILE_SECURE, FILE_ORIG } clean; 37 static struct passwd pwd; /* password structure */ 38 static char *pname; /* password file name */ 39 40 main(argc, argv) 41 int argc; 42 char **argv; 43 { 44 extern int optind; 45 register int len, makeold; 46 register char *p, *t; 47 FILE *fp, *oldfp; 48 DB *dp, *edp; 49 sigset_t set; 50 DBT data, key; 51 int ch, cnt, tfd; 52 char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024]; 53 54 makeold = 0; 55 while ((ch = getopt(argc, argv, "pv")) != EOF) 56 switch(ch) { 57 case 'p': /* create V7 "file.orig" */ 58 makeold = 1; 59 break; 60 case 'v': /* backward compatible */ 61 break; 62 case '?': 63 default: 64 usage(); 65 } 66 argc -= optind; 67 argv += optind; 68 69 if (argc != 1) 70 usage(); 71 72 /* 73 * This could be done to allow the user to interrupt. Probably 74 * not worth the effort. 75 */ 76 sigemptyset(&set); 77 sigaddset(&set, SIGTSTP); 78 sigaddset(&set, SIGHUP); 79 sigaddset(&set, SIGINT); 80 sigaddset(&set, SIGQUIT); 81 sigaddset(&set, SIGTERM); 82 (void)sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL); 83 84 pname = *argv; 85 /* Open the original password file */ 86 if (!(fp = fopen(pname, "r"))) 87 error(pname); 88 89 /* Open the temporary insecure password database. */ 90 (void)sprintf(buf, "%s.tmp", _PATH_MP_DB); 91 dp = hash_open(buf, O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE, NULL); 92 if (!dp) 93 error(buf); 94 clean = FILE_INSECURE; 95 96 /* Open the temporary encrypted password database. */ 97 (void)sprintf(buf, "%s.tmp", _PATH_SMP_DB); 98 edp = hash_open(buf, O_WRONLY|O_CREAT|O_EXCL, PERM_SECURE, NULL); 99 if (!edp) 100 error(buf); 101 clean = FILE_SECURE; 102 103 /* 104 * Open file for old password file. Minor trickiness -- don't want to 105 * chance the file already existing, since someone (stupidly) might 106 * still be using this for permission checking. So, open it first and 107 * fdopen the resulting fd. Don't really care who reads it. 108 */ 109 if (makeold) { 110 (void)sprintf(buf, "%s.orig", pname); 111 if ((tfd = open(buf, 112 O_WRONLY|O_CREAT|O_EXCL, PERM_INSECURE)) < 0) 113 error(buf); 114 if (!(oldfp = fdopen(tfd, "w"))) 115 error(buf); 116 clean = FILE_ORIG; 117 } 118 119 /* 120 * The databases actually contain three copies of the original data. 121 * Each password file entry is converted into a rough approximation 122 * of a ``struct passwd'', with the strings placed inline. This 123 * object is then stored as the data for three separate keys. The 124 * first key * is the pw_name field prepended by the _PW_KEYBYNAME 125 * character. The second key is the pw_uid field prepended by the 126 * _PW_KEYBYUID character. The third key is the line number in the 127 * original file prepended by the _PW_KEYBYNUM character. (The special 128 * characters are prepended to ensure that the keys do not collide.) 129 */ 130 data.data = (u_char *)buf; 131 key.data = (u_char *)tbuf; 132 for (cnt = 1; scan(fp, &pwd); ++cnt) { 133 #define COMPACT(e) t = e; while (*p++ = *t++); 134 /* Create insecure data. */ 135 p = buf; 136 COMPACT(pwd.pw_name); 137 COMPACT("*"); 138 bcopy((char *)&pwd.pw_uid, p, sizeof(int)); 139 p += sizeof(int); 140 bcopy((char *)&pwd.pw_gid, p, sizeof(int)); 141 p += sizeof(int); 142 bcopy((char *)&pwd.pw_change, p, sizeof(time_t)); 143 p += sizeof(time_t); 144 COMPACT(pwd.pw_class); 145 COMPACT(pwd.pw_gecos); 146 COMPACT(pwd.pw_dir); 147 COMPACT(pwd.pw_shell); 148 bcopy((char *)&pwd.pw_expire, p, sizeof(time_t)); 149 p += sizeof(time_t); 150 data.size = p - buf; 151 152 /* Store insecure by name. */ 153 tbuf[0] = _PW_KEYBYNAME; 154 len = strlen(pwd.pw_name); 155 bcopy(pwd.pw_name, tbuf + 1, len); 156 key.size = len + 1; 157 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 158 error("put"); 159 160 /* Store insecure by number. */ 161 tbuf[0] = _PW_KEYBYNUM; 162 bcopy((char *)&cnt, tbuf + 1, sizeof(cnt)); 163 key.size = sizeof(cnt) + 1; 164 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 165 error("put"); 166 167 /* Store insecure by uid. */ 168 tbuf[0] = _PW_KEYBYUID; 169 bcopy((char *)&pwd.pw_uid, tbuf + 1, sizeof(pwd.pw_uid)); 170 key.size = sizeof(pwd.pw_uid) + 1; 171 if ((dp->put)(dp, &key, &data, R_NOOVERWRITE) == -1) 172 error("put"); 173 174 /* Create secure data. */ 175 p = buf; 176 COMPACT(pwd.pw_name); 177 COMPACT(pwd.pw_passwd); 178 bcopy((char *)&pwd.pw_uid, p, sizeof(int)); 179 p += sizeof(int); 180 bcopy((char *)&pwd.pw_gid, p, sizeof(int)); 181 p += sizeof(int); 182 bcopy((char *)&pwd.pw_change, p, sizeof(time_t)); 183 p += sizeof(time_t); 184 COMPACT(pwd.pw_class); 185 COMPACT(pwd.pw_gecos); 186 COMPACT(pwd.pw_dir); 187 COMPACT(pwd.pw_shell); 188 bcopy((char *)&pwd.pw_expire, p, sizeof(time_t)); 189 p += sizeof(time_t); 190 data.size = p - buf; 191 192 /* Store secure by name. */ 193 tbuf[0] = _PW_KEYBYNAME; 194 len = strlen(pwd.pw_name); 195 bcopy(pwd.pw_name, tbuf + 1, len); 196 key.size = len + 1; 197 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 198 error("put"); 199 200 /* Store secure by number. */ 201 tbuf[0] = _PW_KEYBYNUM; 202 bcopy((char *)&cnt, tbuf + 1, sizeof(cnt)); 203 key.size = sizeof(cnt) + 1; 204 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 205 error("put"); 206 207 /* Store secure by uid. */ 208 tbuf[0] = _PW_KEYBYUID; 209 bcopy((char *)&pwd.pw_uid, tbuf + 1, sizeof(pwd.pw_uid)); 210 key.size = sizeof(pwd.pw_uid) + 1; 211 if ((dp->put)(edp, &key, &data, R_NOOVERWRITE) == -1) 212 error("put"); 213 214 /* Create original format password file entry */ 215 if (makeold) 216 (void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n", 217 pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos, 218 pwd.pw_dir, pwd.pw_shell); 219 } 220 (void)(dp->close)(dp); 221 (void)(edp->close)(edp); 222 if (makeold) { 223 (void)fsync(oldfp); 224 (void)fclose(oldfp); 225 } 226 227 /* Set master.passwd permissions, in case caller forgot. */ 228 (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR); 229 (void)fclose(fp); 230 231 /* Install as the real password files. */ 232 (void)sprintf(buf, "%s.tmp", _PATH_MP_DB); 233 mv(buf, _PATH_MP_DB); 234 (void)sprintf(buf, "%s.tmp", _PATH_SMP_DB); 235 mv(buf, _PATH_SMP_DB); 236 if (makeold) { 237 (void)sprintf(buf, "%s.orig", pname); 238 mv(buf, _PATH_PASSWD); 239 } 240 /* 241 * Move the master password LAST -- chpass(1), passwd(1) and vipw(8) 242 * all use flock(2) on it to block other incarnations of themselves. 243 * The rename means that everything is unlocked, as the original file 244 * can no longer be accessed. 245 */ 246 mv(pname, _PATH_MASTERPASSWD); 247 exit(0); 248 } 249 250 scan(fp, pw) 251 FILE *fp; 252 struct passwd *pw; 253 { 254 static int lcnt; 255 static char line[LINE_MAX]; 256 char *p; 257 258 if (!fgets(line, sizeof(line), fp)) 259 return(0); 260 ++lcnt; 261 /* 262 * ``... if I swallow anything evil, put your fingers down my 263 * throat...'' 264 * -- The Who 265 */ 266 if (!(p = index(line, '\n'))) { 267 (void)fprintf(stderr, "pwd_mkdb: line too long\n"); 268 goto fmt; 269 270 } 271 *p = '\0'; 272 if (!pw_scan(line, pw)) { 273 (void)fprintf(stderr, "pwd_mkdb: at line #%d.\n", lcnt); 274 fmt: errno = EFTYPE; 275 error(pname); 276 exit(1); 277 } 278 } 279 280 mv(from, to) 281 char *from, *to; 282 { 283 int sverrno; 284 char buf[MAXPATHLEN]; 285 286 if (rename(from, to)) { 287 sverrno = errno; 288 (void)sprintf(buf, "%s to %s", from, to); 289 errno = sverrno; 290 error(buf); 291 } 292 } 293 294 error(name) 295 char *name; 296 { 297 (void)fprintf(stderr, "pwd_mkdb: %s: %s\n", name, strerror(errno)); 298 cleanup(); 299 exit(1); 300 } 301 302 cleanup() 303 { 304 char buf[MAXPATHLEN]; 305 306 switch(clean) { 307 case FILE_ORIG: 308 (void)sprintf(buf, "%s.orig", pname); 309 (void)unlink(buf); 310 /* FALLTHROUGH */ 311 case FILE_SECURE: 312 (void)sprintf(buf, "%s.tmp", _PATH_SMP_DB); 313 (void)unlink(buf); 314 /* FALLTHROUGH */ 315 case FILE_INSECURE: 316 (void)sprintf(buf, "%s.tmp", _PATH_MP_DB); 317 (void)unlink(buf); 318 } 319 } 320 321 usage() 322 { 323 (void)fprintf(stderr, "usage: pwd_mkdb [-p] file\n"); 324 exit(1); 325 } 326