1 /*- 2 * Copyright (c) 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 2002 Networks Associates Technology, Inc. 5 * All rights reserved. 6 * 7 * Portions of this software were developed for the FreeBSD Project by 8 * ThinkSec AS and NAI Labs, the Security Research Division of Network 9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 10 * ("CBOSS"), as part of the DARPA CHATS research program. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 */ 40 41 #ifndef lint 42 static const char copyright[] = 43 "@(#) Copyright (c) 1988, 1993, 1994\n\ 44 The Regents of the University of California. All rights reserved.\n"; 45 #endif /* not lint */ 46 47 #if 0 48 #ifndef lint 49 static char sccsid[] = "@(#)chpass.c 8.4 (Berkeley) 4/2/94"; 50 #endif /* not lint */ 51 #endif 52 53 #include <sys/cdefs.h> 54 __FBSDID("$FreeBSD$"); 55 56 #include <sys/param.h> 57 #include <sys/stat.h> 58 #include <sys/signal.h> 59 #include <sys/time.h> 60 #include <sys/resource.h> 61 62 #include <ctype.h> 63 #include <err.h> 64 #include <errno.h> 65 #include <fcntl.h> 66 #include <pwd.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #include <unistd.h> 71 #ifdef YP 72 #include <ypclnt.h> 73 #endif 74 75 #include <pw_scan.h> 76 #include <libutil.h> 77 78 #include "chpass.h" 79 80 int master_mode; 81 82 static void baduser(void); 83 static void usage(void); 84 85 char localhost[] = "localhost"; 86 87 int 88 main(int argc, char *argv[]) 89 { 90 enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op; 91 struct passwd *pw = NULL, lpw, *old_pw; 92 int ch, pfd, tfd; 93 const char *password; 94 char *arg = NULL; 95 uid_t uid; 96 #ifdef YP 97 struct ypclnt *ypclnt; 98 const char *yp_domain = NULL, *yp_host = NULL; 99 #endif 100 101 op = EDITENTRY; 102 #ifdef YP 103 while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1) 104 #else 105 while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1) 106 #endif 107 switch (ch) { 108 case 'a': 109 op = LOADENTRY; 110 arg = optarg; 111 break; 112 case 's': 113 op = NEWSH; 114 arg = optarg; 115 break; 116 case 'p': 117 op = NEWPW; 118 arg = optarg; 119 break; 120 case 'e': 121 op = NEWEXP; 122 arg = optarg; 123 break; 124 #ifdef YP 125 case 'd': 126 yp_domain = optarg; 127 break; 128 case 'h': 129 yp_host = optarg; 130 break; 131 case 'l': 132 case 'o': 133 case 'y': 134 /* compatibility */ 135 break; 136 #endif 137 case '?': 138 default: 139 usage(); 140 } 141 142 argc -= optind; 143 argv += optind; 144 145 if (argc > 1) 146 usage(); 147 148 uid = getuid(); 149 150 if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) { 151 if (argc == 0) { 152 if ((pw = getpwuid(uid)) == NULL) 153 errx(1, "unknown user: uid %lu", 154 (unsigned long)uid); 155 } else { 156 if ((pw = getpwnam(*argv)) == NULL) 157 errx(1, "unknown user: %s", *argv); 158 if (uid != 0 && uid != pw->pw_uid) 159 baduser(); 160 } 161 162 /* Make a copy for later verification */ 163 if ((pw = pw_dup(pw)) == NULL || 164 (old_pw = pw_dup(pw)) == NULL) 165 err(1, "pw_dup"); 166 } 167 168 #ifdef YP 169 if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) { 170 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host); 171 master_mode = (ypclnt != NULL && 172 ypclnt_connect(ypclnt) != -1 && 173 ypclnt_havepasswdd(ypclnt) == 1); 174 ypclnt_free(ypclnt); 175 } else 176 #endif 177 master_mode = (uid == 0); 178 179 if (op == NEWSH) { 180 /* protect p_shell -- it thinks NULL is /bin/sh */ 181 if (!arg[0]) 182 usage(); 183 if (p_shell(arg, pw, (ENTRY *)NULL) == -1) 184 exit(1); 185 } 186 187 if (op == NEWEXP) { 188 if (uid) /* only root can change expire */ 189 baduser(); 190 if (p_expire(arg, pw, (ENTRY *)NULL) == -1) 191 exit(1); 192 } 193 194 if (op == LOADENTRY) { 195 if (uid) 196 baduser(); 197 pw = &lpw; 198 old_pw = NULL; 199 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER)) 200 exit(1); 201 } 202 203 if (op == NEWPW) { 204 if (uid) 205 baduser(); 206 207 if (strchr(arg, ':')) 208 errx(1, "invalid format for password"); 209 pw->pw_passwd = arg; 210 } 211 212 if (op == EDITENTRY) { 213 /* 214 * We don't really need pw_*() here, but pw_edit() (used 215 * by edit()) is just too useful... 216 */ 217 if (pw_init(NULL, NULL)) 218 err(1, "pw_init()"); 219 if ((tfd = pw_tmp(-1)) == -1) { 220 pw_fini(); 221 err(1, "pw_tmp()"); 222 } 223 free(pw); 224 pw = edit(pw_tempname(), old_pw); 225 pw_fini(); 226 if (pw == NULL) 227 err(1, "edit()"); 228 if (pw_equal(old_pw, pw)) 229 errx(0, "user information unchanged"); 230 } 231 232 if (old_pw && !master_mode) { 233 password = getpass("Password: "); 234 if (strcmp(crypt(password, old_pw->pw_passwd), 235 old_pw->pw_passwd) != 0) 236 baduser(); 237 } else { 238 password = ""; 239 } 240 241 if (old_pw != NULL) 242 pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE); 243 switch (pw->pw_fields & _PWF_SOURCE) { 244 #ifdef YP 245 case _PWF_NIS: 246 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host); 247 if (ypclnt == NULL || 248 ypclnt_connect(ypclnt) == -1 || 249 ypclnt_passwd(ypclnt, pw, password) == -1) { 250 warnx("%s", ypclnt->error); 251 ypclnt_free(ypclnt); 252 exit(1); 253 } 254 ypclnt_free(ypclnt); 255 errx(0, "NIS user information updated"); 256 #endif /* YP */ 257 case 0: 258 case _PWF_FILES: 259 if (pw_init(NULL, NULL)) 260 err(1, "pw_init()"); 261 if ((pfd = pw_lock()) == -1) { 262 pw_fini(); 263 err(1, "pw_lock()"); 264 } 265 if ((tfd = pw_tmp(-1)) == -1) { 266 pw_fini(); 267 err(1, "pw_tmp()"); 268 } 269 if (pw_copy(pfd, tfd, pw, old_pw) == -1) { 270 pw_fini(); 271 err(1, "pw_copy"); 272 } 273 if (pw_mkdb(pw->pw_name) == -1) { 274 pw_fini(); 275 err(1, "pw_mkdb()"); 276 } 277 pw_fini(); 278 errx(0, "user information updated"); 279 break; 280 default: 281 errx(1, "unsupported passwd source"); 282 } 283 } 284 285 static void 286 baduser(void) 287 { 288 289 errx(1, "%s", strerror(EACCES)); 290 } 291 292 static void 293 usage(void) 294 { 295 296 (void)fprintf(stderr, 297 "Usage: chpass%s %s [user]\n", 298 #ifdef YP 299 " [-d domain] [-h host]", 300 #else 301 "", 302 #endif 303 "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]"); 304 exit(1); 305 } 306