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 * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved. 41 * @(#)chpass.c 8.4 (Berkeley) 4/2/94 42 * $FreeBSD: src/usr.bin/chpass/chpass.c,v 1.28 2006/09/25 15:06:24 marck Exp $ 43 * $DragonFly: src/usr.bin/chpass/chpass.c,v 1.4 2003/11/03 19:31:28 eirikn Exp $ 44 */ 45 46 #include <sys/param.h> 47 48 #include <err.h> 49 #include <errno.h> 50 #include <pwd.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 #ifdef YP 56 #include <ypclnt.h> 57 #endif 58 59 #include <pw_scan.h> 60 #include <libutil.h> 61 62 #include "chpass.h" 63 64 int master_mode; 65 66 static void baduser(void); 67 static void usage(void); 68 69 int 70 main(int argc, char **argv) 71 { 72 enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op; 73 struct passwd lpw, *old_pw, *pw; 74 int ch, pfd, tfd; 75 const char *password; 76 char *arg = NULL; 77 uid_t uid; 78 #ifdef YP 79 struct ypclnt *ypclnt; 80 const char *yp_domain = NULL, *yp_host = NULL; 81 #endif 82 83 pw = old_pw = NULL; 84 op = EDITENTRY; 85 #ifdef YP 86 while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1) 87 #else 88 while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1) 89 #endif 90 switch (ch) { 91 case 'a': 92 op = LOADENTRY; 93 arg = optarg; 94 break; 95 case 's': 96 op = NEWSH; 97 arg = optarg; 98 break; 99 case 'p': 100 op = NEWPW; 101 arg = optarg; 102 break; 103 case 'e': 104 op = NEWEXP; 105 arg = optarg; 106 break; 107 #ifdef YP 108 case 'd': 109 yp_domain = optarg; 110 break; 111 case 'h': 112 yp_host = optarg; 113 break; 114 case 'l': 115 case 'o': 116 case 'y': 117 /* compatibility */ 118 break; 119 #endif 120 case '?': 121 default: 122 usage(); 123 } 124 125 argc -= optind; 126 argv += optind; 127 128 if (argc > 1) 129 usage(); 130 131 uid = getuid(); 132 133 if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) { 134 if (argc == 0) { 135 if ((pw = getpwuid(uid)) == NULL) 136 errx(1, "unknown user: uid %lu", 137 (unsigned long)uid); 138 } else { 139 if ((pw = getpwnam(*argv)) == NULL) 140 errx(1, "unknown user: %s", *argv); 141 if (uid != 0 && uid != pw->pw_uid) 142 baduser(); 143 } 144 145 /* Make a copy for later verification */ 146 if ((pw = pw_dup(pw)) == NULL || 147 (old_pw = pw_dup(pw)) == NULL) 148 err(1, "pw_dup"); 149 } 150 151 #ifdef YP 152 if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) { 153 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host); 154 master_mode = (ypclnt != NULL && 155 ypclnt_connect(ypclnt) != -1 && 156 ypclnt_havepasswdd(ypclnt) == 1); 157 ypclnt_free(ypclnt); 158 } else 159 #endif 160 master_mode = (uid == 0); 161 162 if (op == NEWSH) { 163 /* protect p_shell -- it thinks NULL is /bin/sh */ 164 if (!arg[0]) 165 usage(); 166 if (p_shell(arg, pw, NULL) == -1) 167 exit(1); 168 } 169 170 if (op == NEWEXP) { 171 if (uid) /* only root can change expire */ 172 baduser(); 173 if (p_expire(arg, pw, NULL) == -1) 174 exit(1); 175 } 176 177 if (op == LOADENTRY) { 178 if (uid) 179 baduser(); 180 pw = &lpw; 181 old_pw = NULL; 182 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER)) 183 exit(1); 184 } 185 186 if (op == NEWPW) { 187 if (uid) 188 baduser(); 189 190 if (strchr(arg, ':')) 191 errx(1, "invalid format for password"); 192 pw->pw_passwd = arg; 193 } 194 195 if (op == EDITENTRY) { 196 /* 197 * We don't really need pw_*() here, but pw_edit() (used 198 * by edit()) is just too useful... 199 */ 200 if (pw_init(NULL, NULL)) 201 err(1, "pw_init()"); 202 if ((tfd = pw_tmp(-1)) == -1) { 203 pw_fini(); 204 err(1, "pw_tmp()"); 205 } 206 free(pw); 207 pw = edit(pw_tempname(), old_pw); 208 pw_fini(); 209 if (pw == NULL) 210 err(1, "edit()"); 211 /* 212 * pw_equal does not check for crypted passwords, so we 213 * should do it explicitly 214 */ 215 if (pw_equal(old_pw, pw) && 216 strcmp(old_pw->pw_passwd, pw->pw_passwd) == 0) 217 errx(0, "user information unchanged"); 218 } 219 220 if (old_pw && !master_mode) { 221 password = getpass("Password: "); 222 if (strcmp(crypt(password, old_pw->pw_passwd), 223 old_pw->pw_passwd) != 0) 224 baduser(); 225 } else { 226 password = ""; 227 } 228 229 if (old_pw != NULL) 230 pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE); 231 switch (pw->pw_fields & _PWF_SOURCE) { 232 #ifdef YP 233 case _PWF_NIS: 234 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host); 235 if (ypclnt == NULL || 236 ypclnt_connect(ypclnt) == -1 || 237 ypclnt_passwd(ypclnt, pw, password) == -1) { 238 warnx("%s", ypclnt->error); 239 ypclnt_free(ypclnt); 240 exit(1); 241 } 242 ypclnt_free(ypclnt); 243 errx(0, "NIS user information updated"); 244 #endif /* YP */ 245 case 0: 246 case _PWF_FILES: 247 if (pw_init(NULL, NULL)) 248 err(1, "pw_init()"); 249 if ((pfd = pw_lock()) == -1) { 250 pw_fini(); 251 err(1, "pw_lock()"); 252 } 253 if ((tfd = pw_tmp(-1)) == -1) { 254 pw_fini(); 255 err(1, "pw_tmp()"); 256 } 257 if (pw_copy(pfd, tfd, pw, old_pw) == -1) { 258 pw_fini(); 259 err(1, "pw_copy"); 260 } 261 if (pw_mkdb(pw->pw_name) == -1) { 262 pw_fini(); 263 err(1, "pw_mkdb()"); 264 } 265 pw_fini(); 266 errx(0, "user information updated"); 267 break; 268 default: 269 errx(1, "unsupported passwd source"); 270 } 271 } 272 273 static void 274 baduser(void) 275 { 276 277 errx(1, "%s", strerror(EACCES)); 278 } 279 280 static void 281 usage(void) 282 { 283 284 fprintf(stderr, 285 "usage: chpass%s %s [user]\n", 286 #ifdef YP 287 " [-d domain] [-h host]", 288 #else 289 "", 290 #endif 291 "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]"); 292 exit(1); 293 } 294