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 */ 40 41 #include <sys/param.h> 42 43 #include <err.h> 44 #include <errno.h> 45 #include <pwd.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 #ifdef YP 51 #include <ypclnt.h> 52 #endif 53 54 #include <pw_scan.h> 55 #include <libutil.h> 56 57 #include "chpass.h" 58 59 int master_mode; 60 61 static void baduser(void); 62 static void usage(void); 63 64 int 65 main(int argc, char **argv) 66 { 67 enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op; 68 struct passwd lpw, *old_pw, *pw; 69 int ch, pfd, tfd; 70 const char *password; 71 char *cryptpw; 72 char *arg = NULL; 73 uid_t uid; 74 #ifdef YP 75 struct ypclnt *ypclnt; 76 const char *yp_domain = NULL, *yp_host = NULL; 77 #endif 78 79 pw = old_pw = NULL; 80 op = EDITENTRY; 81 #ifdef YP 82 while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1) 83 #else 84 while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1) 85 #endif 86 switch (ch) { 87 case 'a': 88 op = LOADENTRY; 89 arg = optarg; 90 break; 91 case 's': 92 op = NEWSH; 93 arg = optarg; 94 break; 95 case 'p': 96 op = NEWPW; 97 arg = optarg; 98 break; 99 case 'e': 100 op = NEWEXP; 101 arg = optarg; 102 break; 103 #ifdef YP 104 case 'd': 105 yp_domain = optarg; 106 break; 107 case 'h': 108 yp_host = optarg; 109 break; 110 case 'l': 111 case 'o': 112 case 'y': 113 /* compatibility */ 114 break; 115 #endif 116 case '?': 117 default: 118 usage(); 119 } 120 121 argc -= optind; 122 argv += optind; 123 124 if (argc > 1) 125 usage(); 126 127 uid = getuid(); 128 129 if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) { 130 if (argc == 0) { 131 if ((pw = getpwuid(uid)) == NULL) 132 errx(1, "unknown user: uid %lu", 133 (unsigned long)uid); 134 } else { 135 if ((pw = getpwnam(*argv)) == NULL) 136 errx(1, "unknown user: %s", *argv); 137 if (uid != 0 && uid != pw->pw_uid) 138 baduser(); 139 } 140 141 /* Make a copy for later verification */ 142 if ((pw = pw_dup(pw)) == NULL || 143 (old_pw = pw_dup(pw)) == NULL) 144 err(1, "pw_dup"); 145 } 146 147 #ifdef YP 148 if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) { 149 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host); 150 master_mode = (ypclnt != NULL && 151 ypclnt_connect(ypclnt) != -1 && 152 ypclnt_havepasswdd(ypclnt) == 1); 153 ypclnt_free(ypclnt); 154 } else 155 #endif 156 master_mode = (uid == 0); 157 158 if (op == NEWSH) { 159 /* protect p_shell -- it thinks NULL is /bin/sh */ 160 if (!arg[0]) 161 usage(); 162 if (p_shell(arg, pw, NULL) == -1) 163 exit(1); 164 } 165 166 if (op == NEWEXP) { 167 if (uid) /* only root can change expire */ 168 baduser(); 169 if (p_expire(arg, pw, NULL) == -1) 170 exit(1); 171 } 172 173 if (op == LOADENTRY) { 174 if (uid) 175 baduser(); 176 pw = &lpw; 177 old_pw = NULL; 178 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER)) 179 exit(1); 180 } 181 182 if (op == NEWPW) { 183 if (uid) 184 baduser(); 185 186 if (strchr(arg, ':')) 187 errx(1, "invalid format for password"); 188 pw->pw_passwd = arg; 189 } 190 191 if (op == EDITENTRY) { 192 /* 193 * We don't really need pw_*() here, but pw_edit() (used 194 * by edit()) is just too useful... 195 */ 196 if (pw_init(NULL, NULL)) 197 err(1, "pw_init()"); 198 if ((tfd = pw_tmp(-1)) == -1) { 199 pw_fini(); 200 err(1, "pw_tmp()"); 201 } 202 free(pw); 203 pw = edit(pw_tempname(), old_pw); 204 pw_fini(); 205 if (pw == NULL) 206 err(1, "edit()"); 207 /* 208 * pw_equal does not check for crypted passwords, so we 209 * should do it explicitly 210 */ 211 if (pw_equal(old_pw, pw) && 212 strcmp(old_pw->pw_passwd, pw->pw_passwd) == 0) 213 errx(0, "user information unchanged"); 214 } 215 216 if (old_pw && !master_mode) { 217 password = getpass("Password: "); 218 cryptpw = crypt(password, old_pw->pw_passwd); 219 if (cryptpw == NULL || strcmp(cryptpw, old_pw->pw_passwd) != 0) 220 baduser(); 221 } else { 222 password = ""; 223 } 224 225 if (old_pw != NULL) 226 pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE); 227 switch (pw->pw_fields & _PWF_SOURCE) { 228 #ifdef YP 229 case _PWF_NIS: 230 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host); 231 if (ypclnt == NULL) { 232 warnx("ypclnt_new failed"); 233 exit(1); 234 } 235 if (ypclnt_connect(ypclnt) == -1 || 236 ypclnt_passwd(ypclnt, pw, password) == -1) { 237 warnx("%s", ypclnt->error); 238 ypclnt_free(ypclnt); 239 exit(1); 240 } 241 ypclnt_free(ypclnt); 242 errx(0, "NIS user information updated"); 243 #endif /* YP */ 244 case 0: 245 case _PWF_FILES: 246 if (pw_init(NULL, NULL)) 247 err(1, "pw_init()"); 248 if ((pfd = pw_lock()) == -1) { 249 pw_fini(); 250 err(1, "pw_lock()"); 251 } 252 if ((tfd = pw_tmp(-1)) == -1) { 253 pw_fini(); 254 err(1, "pw_tmp()"); 255 } 256 if (pw_copy(pfd, tfd, pw, old_pw) == -1) { 257 pw_fini(); 258 err(1, "pw_copy"); 259 } 260 if (pw_mkdb(pw->pw_name) == -1) { 261 pw_fini(); 262 err(1, "pw_mkdb()"); 263 } 264 pw_fini(); 265 errx(0, "user information updated"); 266 break; 267 default: 268 errx(1, "unsupported passwd source"); 269 } 270 } 271 272 static void 273 baduser(void) 274 { 275 276 errx(1, "%s", strerror(EACCES)); 277 } 278 279 static void 280 usage(void) 281 { 282 283 fprintf(stderr, 284 "usage: chpass%s %s [user]\n", 285 #ifdef YP 286 " [-d domain] [-h host]", 287 #else 288 "", 289 #endif 290 "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]"); 291 exit(1); 292 } 293