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 int 86 main(int argc, char *argv[]) 87 { 88 enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op; 89 struct passwd lpw, *old_pw, *pw; 90 int ch, pfd, tfd; 91 const char *password; 92 char *arg = NULL; 93 uid_t uid; 94 #ifdef YP 95 struct ypclnt *ypclnt; 96 const char *yp_domain = NULL, *yp_host = NULL; 97 #endif 98 99 pw = old_pw = NULL; 100 op = EDITENTRY; 101 #ifdef YP 102 while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1) 103 #else 104 while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1) 105 #endif 106 switch (ch) { 107 case 'a': 108 op = LOADENTRY; 109 arg = optarg; 110 break; 111 case 's': 112 op = NEWSH; 113 arg = optarg; 114 break; 115 case 'p': 116 op = NEWPW; 117 arg = optarg; 118 break; 119 case 'e': 120 op = NEWEXP; 121 arg = optarg; 122 break; 123 #ifdef YP 124 case 'd': 125 yp_domain = optarg; 126 break; 127 case 'h': 128 yp_host = optarg; 129 break; 130 case 'l': 131 case 'o': 132 case 'y': 133 /* compatibility */ 134 break; 135 #endif 136 case '?': 137 default: 138 usage(); 139 } 140 141 argc -= optind; 142 argv += optind; 143 144 if (argc > 1) 145 usage(); 146 147 uid = getuid(); 148 149 if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) { 150 if (argc == 0) { 151 if ((pw = getpwuid(uid)) == NULL) 152 errx(1, "unknown user: uid %lu", 153 (unsigned long)uid); 154 } else { 155 if ((pw = getpwnam(*argv)) == NULL) 156 errx(1, "unknown user: %s", *argv); 157 if (uid != 0 && uid != pw->pw_uid) 158 baduser(); 159 } 160 161 /* Make a copy for later verification */ 162 if ((pw = pw_dup(pw)) == NULL || 163 (old_pw = pw_dup(pw)) == NULL) 164 err(1, "pw_dup"); 165 } 166 167 #ifdef YP 168 if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) { 169 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host); 170 master_mode = (ypclnt != NULL && 171 ypclnt_connect(ypclnt) != -1 && 172 ypclnt_havepasswdd(ypclnt) == 1); 173 ypclnt_free(ypclnt); 174 } else 175 #endif 176 master_mode = (uid == 0); 177 178 if (op == NEWSH) { 179 /* protect p_shell -- it thinks NULL is /bin/sh */ 180 if (!arg[0]) 181 usage(); 182 if (p_shell(arg, pw, (ENTRY *)NULL) == -1) 183 exit(1); 184 } 185 186 if (op == NEWEXP) { 187 if (uid) /* only root can change expire */ 188 baduser(); 189 if (p_expire(arg, pw, (ENTRY *)NULL) == -1) 190 exit(1); 191 } 192 193 if (op == LOADENTRY) { 194 if (uid) 195 baduser(); 196 pw = &lpw; 197 old_pw = NULL; 198 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER)) 199 exit(1); 200 } 201 202 if (op == NEWPW) { 203 if (uid) 204 baduser(); 205 206 if (strchr(arg, ':')) 207 errx(1, "invalid format for password"); 208 pw->pw_passwd = arg; 209 } 210 211 if (op == EDITENTRY) { 212 /* 213 * We don't really need pw_*() here, but pw_edit() (used 214 * by edit()) is just too useful... 215 */ 216 if (pw_init(NULL, NULL)) 217 err(1, "pw_init()"); 218 if ((tfd = pw_tmp(-1)) == -1) { 219 pw_fini(); 220 err(1, "pw_tmp()"); 221 } 222 free(pw); 223 pw = edit(pw_tempname(), old_pw); 224 pw_fini(); 225 if (pw == NULL) 226 err(1, "edit()"); 227 if (pw_equal(old_pw, pw)) 228 errx(0, "user information unchanged"); 229 } 230 231 if (old_pw && !master_mode) { 232 password = getpass("Password: "); 233 if (strcmp(crypt(password, old_pw->pw_passwd), 234 old_pw->pw_passwd) != 0) 235 baduser(); 236 } else { 237 password = ""; 238 } 239 240 if (old_pw != NULL) 241 pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE); 242 switch (pw->pw_fields & _PWF_SOURCE) { 243 #ifdef YP 244 case _PWF_NIS: 245 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host); 246 if (ypclnt == NULL || 247 ypclnt_connect(ypclnt) == -1 || 248 ypclnt_passwd(ypclnt, pw, password) == -1) { 249 warnx("%s", ypclnt->error); 250 ypclnt_free(ypclnt); 251 exit(1); 252 } 253 ypclnt_free(ypclnt); 254 errx(0, "NIS user information updated"); 255 #endif /* YP */ 256 case 0: 257 case _PWF_FILES: 258 if (pw_init(NULL, NULL)) 259 err(1, "pw_init()"); 260 if ((pfd = pw_lock()) == -1) { 261 pw_fini(); 262 err(1, "pw_lock()"); 263 } 264 if ((tfd = pw_tmp(-1)) == -1) { 265 pw_fini(); 266 err(1, "pw_tmp()"); 267 } 268 if (pw_copy(pfd, tfd, pw, old_pw) == -1) { 269 pw_fini(); 270 err(1, "pw_copy"); 271 } 272 if (pw_mkdb(pw->pw_name) == -1) { 273 pw_fini(); 274 err(1, "pw_mkdb()"); 275 } 276 pw_fini(); 277 errx(0, "user information updated"); 278 break; 279 default: 280 errx(1, "unsupported passwd source"); 281 } 282 } 283 284 static void 285 baduser(void) 286 { 287 288 errx(1, "%s", strerror(EACCES)); 289 } 290 291 static void 292 usage(void) 293 { 294 295 (void)fprintf(stderr, 296 "Usage: chpass%s %s [user]\n", 297 #ifdef YP 298 " [-d domain] [-h host]", 299 #else 300 "", 301 #endif 302 "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]"); 303 exit(1); 304 } 305