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 *cryptpw; 77 char *arg = NULL; 78 uid_t uid; 79 #ifdef YP 80 struct ypclnt *ypclnt; 81 const char *yp_domain = NULL, *yp_host = NULL; 82 #endif 83 84 pw = old_pw = NULL; 85 op = EDITENTRY; 86 #ifdef YP 87 while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1) 88 #else 89 while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1) 90 #endif 91 switch (ch) { 92 case 'a': 93 op = LOADENTRY; 94 arg = optarg; 95 break; 96 case 's': 97 op = NEWSH; 98 arg = optarg; 99 break; 100 case 'p': 101 op = NEWPW; 102 arg = optarg; 103 break; 104 case 'e': 105 op = NEWEXP; 106 arg = optarg; 107 break; 108 #ifdef YP 109 case 'd': 110 yp_domain = optarg; 111 break; 112 case 'h': 113 yp_host = optarg; 114 break; 115 case 'l': 116 case 'o': 117 case 'y': 118 /* compatibility */ 119 break; 120 #endif 121 case '?': 122 default: 123 usage(); 124 } 125 126 argc -= optind; 127 argv += optind; 128 129 if (argc > 1) 130 usage(); 131 132 uid = getuid(); 133 134 if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) { 135 if (argc == 0) { 136 if ((pw = getpwuid(uid)) == NULL) 137 errx(1, "unknown user: uid %lu", 138 (unsigned long)uid); 139 } else { 140 if ((pw = getpwnam(*argv)) == NULL) 141 errx(1, "unknown user: %s", *argv); 142 if (uid != 0 && uid != pw->pw_uid) 143 baduser(); 144 } 145 146 /* Make a copy for later verification */ 147 if ((pw = pw_dup(pw)) == NULL || 148 (old_pw = pw_dup(pw)) == NULL) 149 err(1, "pw_dup"); 150 } 151 152 #ifdef YP 153 if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) { 154 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host); 155 master_mode = (ypclnt != NULL && 156 ypclnt_connect(ypclnt) != -1 && 157 ypclnt_havepasswdd(ypclnt) == 1); 158 ypclnt_free(ypclnt); 159 } else 160 #endif 161 master_mode = (uid == 0); 162 163 if (op == NEWSH) { 164 /* protect p_shell -- it thinks NULL is /bin/sh */ 165 if (!arg[0]) 166 usage(); 167 if (p_shell(arg, pw, NULL) == -1) 168 exit(1); 169 } 170 171 if (op == NEWEXP) { 172 if (uid) /* only root can change expire */ 173 baduser(); 174 if (p_expire(arg, pw, NULL) == -1) 175 exit(1); 176 } 177 178 if (op == LOADENTRY) { 179 if (uid) 180 baduser(); 181 pw = &lpw; 182 old_pw = NULL; 183 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER)) 184 exit(1); 185 } 186 187 if (op == NEWPW) { 188 if (uid) 189 baduser(); 190 191 if (strchr(arg, ':')) 192 errx(1, "invalid format for password"); 193 pw->pw_passwd = arg; 194 } 195 196 if (op == EDITENTRY) { 197 /* 198 * We don't really need pw_*() here, but pw_edit() (used 199 * by edit()) is just too useful... 200 */ 201 if (pw_init(NULL, NULL)) 202 err(1, "pw_init()"); 203 if ((tfd = pw_tmp(-1)) == -1) { 204 pw_fini(); 205 err(1, "pw_tmp()"); 206 } 207 free(pw); 208 pw = edit(pw_tempname(), old_pw); 209 pw_fini(); 210 if (pw == NULL) 211 err(1, "edit()"); 212 /* 213 * pw_equal does not check for crypted passwords, so we 214 * should do it explicitly 215 */ 216 if (pw_equal(old_pw, pw) && 217 strcmp(old_pw->pw_passwd, pw->pw_passwd) == 0) 218 errx(0, "user information unchanged"); 219 } 220 221 if (old_pw && !master_mode) { 222 password = getpass("Password: "); 223 cryptpw = crypt(password, old_pw->pw_passwd); 224 if (cryptpw == NULL || strcmp(cryptpw, old_pw->pw_passwd) != 0) 225 baduser(); 226 } else { 227 password = ""; 228 } 229 230 if (old_pw != NULL) 231 pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE); 232 switch (pw->pw_fields & _PWF_SOURCE) { 233 #ifdef YP 234 case _PWF_NIS: 235 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host); 236 if (ypclnt == NULL || 237 ypclnt_connect(ypclnt) == -1 || 238 ypclnt_passwd(ypclnt, pw, password) == -1) { 239 warnx("%s", ypclnt->error); 240 ypclnt_free(ypclnt); 241 exit(1); 242 } 243 ypclnt_free(ypclnt); 244 errx(0, "NIS user information updated"); 245 #endif /* YP */ 246 case 0: 247 case _PWF_FILES: 248 if (pw_init(NULL, NULL)) 249 err(1, "pw_init()"); 250 if ((pfd = pw_lock()) == -1) { 251 pw_fini(); 252 err(1, "pw_lock()"); 253 } 254 if ((tfd = pw_tmp(-1)) == -1) { 255 pw_fini(); 256 err(1, "pw_tmp()"); 257 } 258 if (pw_copy(pfd, tfd, pw, old_pw) == -1) { 259 pw_fini(); 260 err(1, "pw_copy"); 261 } 262 if (pw_mkdb(pw->pw_name) == -1) { 263 pw_fini(); 264 err(1, "pw_mkdb()"); 265 } 266 pw_fini(); 267 errx(0, "user information updated"); 268 break; 269 default: 270 errx(1, "unsupported passwd source"); 271 } 272 } 273 274 static void 275 baduser(void) 276 { 277 278 errx(1, "%s", strerror(EACCES)); 279 } 280 281 static void 282 usage(void) 283 { 284 285 fprintf(stderr, 286 "usage: chpass%s %s [user]\n", 287 #ifdef YP 288 " [-d domain] [-h host]", 289 #else 290 "", 291 #endif 292 "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]"); 293 exit(1); 294 } 295