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. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved. 37 * @(#)chpass.c 8.4 (Berkeley) 4/2/94 38 * $FreeBSD: src/usr.bin/chpass/chpass.c,v 1.28 2006/09/25 15:06:24 marck Exp $ 39 * $DragonFly: src/usr.bin/chpass/chpass.c,v 1.4 2003/11/03 19:31:28 eirikn Exp $ 40 */ 41 42 #include <sys/param.h> 43 44 #include <err.h> 45 #include <errno.h> 46 #include <pwd.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <unistd.h> 51 #ifdef YP 52 #include <ypclnt.h> 53 #endif 54 55 #include <pw_scan.h> 56 #include <libutil.h> 57 58 #include "chpass.h" 59 60 int master_mode; 61 62 static void baduser(void); 63 static void usage(void); 64 65 int 66 main(int argc, char **argv) 67 { 68 enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op; 69 struct passwd lpw, *old_pw, *pw; 70 int ch, pfd, tfd; 71 const char *password; 72 char *cryptpw; 73 char *arg = NULL; 74 uid_t uid; 75 #ifdef YP 76 struct ypclnt *ypclnt; 77 const char *yp_domain = NULL, *yp_host = NULL; 78 #endif 79 80 pw = old_pw = NULL; 81 op = EDITENTRY; 82 #ifdef YP 83 while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1) 84 #else 85 while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1) 86 #endif 87 switch (ch) { 88 case 'a': 89 op = LOADENTRY; 90 arg = optarg; 91 break; 92 case 's': 93 op = NEWSH; 94 arg = optarg; 95 break; 96 case 'p': 97 op = NEWPW; 98 arg = optarg; 99 break; 100 case 'e': 101 op = NEWEXP; 102 arg = optarg; 103 break; 104 #ifdef YP 105 case 'd': 106 yp_domain = optarg; 107 break; 108 case 'h': 109 yp_host = optarg; 110 break; 111 case 'l': 112 case 'o': 113 case 'y': 114 /* compatibility */ 115 break; 116 #endif 117 case '?': 118 default: 119 usage(); 120 } 121 122 argc -= optind; 123 argv += optind; 124 125 if (argc > 1) 126 usage(); 127 128 uid = getuid(); 129 130 if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) { 131 if (argc == 0) { 132 if ((pw = getpwuid(uid)) == NULL) 133 errx(1, "unknown user: uid %lu", 134 (unsigned long)uid); 135 } else { 136 if ((pw = getpwnam(*argv)) == NULL) 137 errx(1, "unknown user: %s", *argv); 138 if (uid != 0 && uid != pw->pw_uid) 139 baduser(); 140 } 141 142 /* Make a copy for later verification */ 143 if ((pw = pw_dup(pw)) == NULL || 144 (old_pw = pw_dup(pw)) == NULL) 145 err(1, "pw_dup"); 146 } 147 148 #ifdef YP 149 if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) { 150 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host); 151 master_mode = (ypclnt != NULL && 152 ypclnt_connect(ypclnt) != -1 && 153 ypclnt_havepasswdd(ypclnt) == 1); 154 ypclnt_free(ypclnt); 155 } else 156 #endif 157 master_mode = (uid == 0); 158 159 if (op == NEWSH) { 160 /* protect p_shell -- it thinks NULL is /bin/sh */ 161 if (!arg[0]) 162 usage(); 163 if (p_shell(arg, pw, NULL) == -1) 164 exit(1); 165 } 166 167 if (op == NEWEXP) { 168 if (uid) /* only root can change expire */ 169 baduser(); 170 if (p_expire(arg, pw, NULL) == -1) 171 exit(1); 172 } 173 174 if (op == LOADENTRY) { 175 if (uid) 176 baduser(); 177 pw = &lpw; 178 old_pw = NULL; 179 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER)) 180 exit(1); 181 } 182 183 if (op == NEWPW) { 184 if (uid) 185 baduser(); 186 187 if (strchr(arg, ':')) 188 errx(1, "invalid format for password"); 189 pw->pw_passwd = arg; 190 } 191 192 if (op == EDITENTRY) { 193 /* 194 * We don't really need pw_*() here, but pw_edit() (used 195 * by edit()) is just too useful... 196 */ 197 if (pw_init(NULL, NULL)) 198 err(1, "pw_init()"); 199 if ((tfd = pw_tmp(-1)) == -1) { 200 pw_fini(); 201 err(1, "pw_tmp()"); 202 } 203 free(pw); 204 pw = edit(pw_tempname(), old_pw); 205 pw_fini(); 206 if (pw == NULL) 207 err(1, "edit()"); 208 /* 209 * pw_equal does not check for crypted passwords, so we 210 * should do it explicitly 211 */ 212 if (pw_equal(old_pw, pw) && 213 strcmp(old_pw->pw_passwd, pw->pw_passwd) == 0) 214 errx(0, "user information unchanged"); 215 } 216 217 if (old_pw && !master_mode) { 218 password = getpass("Password: "); 219 cryptpw = crypt(password, old_pw->pw_passwd); 220 if (cryptpw == NULL || strcmp(cryptpw, old_pw->pw_passwd) != 0) 221 baduser(); 222 } else { 223 password = ""; 224 } 225 226 if (old_pw != NULL) 227 pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE); 228 switch (pw->pw_fields & _PWF_SOURCE) { 229 #ifdef YP 230 case _PWF_NIS: 231 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host); 232 if (ypclnt == NULL || 233 ypclnt_connect(ypclnt) == -1 || 234 ypclnt_passwd(ypclnt, pw, password) == -1) { 235 warnx("%s", ypclnt->error); 236 ypclnt_free(ypclnt); 237 exit(1); 238 } 239 ypclnt_free(ypclnt); 240 errx(0, "NIS user information updated"); 241 #endif /* YP */ 242 case 0: 243 case _PWF_FILES: 244 if (pw_init(NULL, NULL)) 245 err(1, "pw_init()"); 246 if ((pfd = pw_lock()) == -1) { 247 pw_fini(); 248 err(1, "pw_lock()"); 249 } 250 if ((tfd = pw_tmp(-1)) == -1) { 251 pw_fini(); 252 err(1, "pw_tmp()"); 253 } 254 if (pw_copy(pfd, tfd, pw, old_pw) == -1) { 255 pw_fini(); 256 err(1, "pw_copy"); 257 } 258 if (pw_mkdb(pw->pw_name) == -1) { 259 pw_fini(); 260 err(1, "pw_mkdb()"); 261 } 262 pw_fini(); 263 errx(0, "user information updated"); 264 break; 265 default: 266 errx(1, "unsupported passwd source"); 267 } 268 } 269 270 static void 271 baduser(void) 272 { 273 274 errx(1, "%s", strerror(EACCES)); 275 } 276 277 static void 278 usage(void) 279 { 280 281 fprintf(stderr, 282 "usage: chpass%s %s [user]\n", 283 #ifdef YP 284 " [-d domain] [-h host]", 285 #else 286 "", 287 #endif 288 "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]"); 289 exit(1); 290 } 291