1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * Copyright (c) 2002 Networks Associates Technology, Inc. 7 * All rights reserved. 8 * 9 * Portions of this software were developed for the FreeBSD Project by 10 * ThinkSec AS and NAI Labs, the Security Research Division of Network 11 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 12 * ("CBOSS"), as part of the DARPA CHATS research program. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the University of 25 * California, Berkeley and its contributors. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 */ 42 43 #if 0 44 #ifndef lint 45 static const char copyright[] = 46 "@(#) Copyright (c) 1988, 1993, 1994\n\ 47 The Regents of the University of California. All rights reserved.\n"; 48 #endif /* not lint */ 49 50 #endif 51 #include <sys/cdefs.h> 52 #include <sys/param.h> 53 54 #include <err.h> 55 #include <errno.h> 56 #include <pwd.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 #ifdef YP 62 #include <ypclnt.h> 63 #endif 64 65 #include <pw_scan.h> 66 #include <libutil.h> 67 68 #include "chpass.h" 69 70 int master_mode; 71 72 static void baduser(void); 73 static void usage(void); 74 75 int 76 main(int argc, char *argv[]) 77 { 78 enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op; 79 struct passwd lpw, *old_pw, *pw; 80 int ch, pfd, tfd; 81 const char *password; 82 char *arg = NULL, *cryptpw; 83 uid_t uid; 84 #ifdef YP 85 struct ypclnt *ypclnt; 86 const char *yp_domain = NULL, *yp_host = NULL; 87 #endif 88 89 pw = old_pw = NULL; 90 op = EDITENTRY; 91 #ifdef YP 92 while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1) 93 #else 94 while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1) 95 #endif 96 switch (ch) { 97 case 'a': 98 op = LOADENTRY; 99 arg = optarg; 100 break; 101 case 's': 102 op = NEWSH; 103 arg = optarg; 104 break; 105 case 'p': 106 op = NEWPW; 107 arg = optarg; 108 break; 109 case 'e': 110 op = NEWEXP; 111 arg = optarg; 112 break; 113 #ifdef YP 114 case 'd': 115 yp_domain = optarg; 116 break; 117 case 'h': 118 yp_host = optarg; 119 break; 120 case 'l': 121 case 'o': 122 case 'y': 123 /* compatibility */ 124 break; 125 #endif 126 case '?': 127 default: 128 usage(); 129 } 130 131 argc -= optind; 132 argv += optind; 133 134 if (argc > 1) 135 usage(); 136 137 uid = getuid(); 138 139 if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) { 140 if (argc == 0) { 141 if ((pw = getpwuid(uid)) == NULL) 142 errx(1, "unknown user: uid %lu", 143 (unsigned long)uid); 144 } else { 145 if ((pw = getpwnam(*argv)) == NULL) 146 errx(1, "unknown user: %s", *argv); 147 if (uid != 0 && uid != pw->pw_uid) 148 baduser(); 149 } 150 151 /* Make a copy for later verification */ 152 if ((pw = pw_dup(pw)) == NULL || 153 (old_pw = pw_dup(pw)) == NULL) 154 err(1, "pw_dup"); 155 } 156 157 #ifdef YP 158 if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) { 159 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host); 160 master_mode = (ypclnt != NULL && 161 ypclnt_connect(ypclnt) != -1 && 162 ypclnt_havepasswdd(ypclnt) == 1); 163 ypclnt_free(ypclnt); 164 } else 165 #endif 166 master_mode = (uid == 0); 167 168 if (op == NEWSH) { 169 /* protect p_shell -- it thinks NULL is /bin/sh */ 170 if (!arg[0]) 171 usage(); 172 if (p_shell(arg, pw, (ENTRY *)NULL) == -1) 173 exit(1); 174 } 175 176 if (op == NEWEXP) { 177 if (uid) /* only root can change expire */ 178 baduser(); 179 if (p_expire(arg, pw, (ENTRY *)NULL) == -1) 180 exit(1); 181 } 182 183 if (op == LOADENTRY) { 184 if (uid) 185 baduser(); 186 pw = &lpw; 187 old_pw = NULL; 188 if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER)) 189 exit(1); 190 } 191 192 if (op == NEWPW) { 193 if (uid) 194 baduser(); 195 196 if (strchr(arg, ':')) 197 errx(1, "invalid format for password"); 198 pw->pw_passwd = arg; 199 } 200 201 if (op == EDITENTRY) { 202 /* 203 * We don't really need pw_*() here, but pw_edit() (used 204 * by edit()) is just too useful... 205 */ 206 if (pw_init(NULL, NULL)) 207 err(1, "pw_init()"); 208 if ((tfd = pw_tmp(-1)) == -1) { 209 pw_fini(); 210 err(1, "pw_tmp()"); 211 } 212 free(pw); 213 pw = edit(pw_tempname(), old_pw); 214 pw_fini(); 215 if (pw == NULL) 216 err(1, "edit()"); 217 /* 218 * pw_equal does not check for crypted passwords, so we 219 * should do it explicitly 220 */ 221 if (pw_equal(old_pw, pw) && 222 strcmp(old_pw->pw_passwd, pw->pw_passwd) == 0) 223 errx(0, "user information unchanged"); 224 } 225 226 if (old_pw && !master_mode) { 227 password = getpass("Password: "); 228 cryptpw = crypt(password, old_pw->pw_passwd); 229 if (cryptpw == NULL || strcmp(cryptpw, old_pw->pw_passwd) != 0) 230 baduser(); 231 } else { 232 password = ""; 233 } 234 235 if (old_pw != NULL) 236 pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE); 237 switch (pw->pw_fields & _PWF_SOURCE) { 238 #ifdef YP 239 case _PWF_NIS: 240 ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host); 241 if (ypclnt == NULL) { 242 warnx("ypclnt_new failed"); 243 exit(1); 244 } 245 if (ypclnt_connect(ypclnt) == -1 || 246 ypclnt_passwd(ypclnt, pw, password) == -1) { 247 warnx("%s", ypclnt->error); 248 ypclnt_free(ypclnt); 249 exit(1); 250 } 251 ypclnt_free(ypclnt); 252 errx(0, "NIS user information updated"); 253 #endif /* YP */ 254 case 0: 255 case _PWF_FILES: 256 if (pw_init(NULL, NULL)) 257 err(1, "pw_init()"); 258 if ((pfd = pw_lock()) == -1) { 259 pw_fini(); 260 err(1, "pw_lock()"); 261 } 262 if ((tfd = pw_tmp(-1)) == -1) { 263 pw_fini(); 264 err(1, "pw_tmp()"); 265 } 266 if (pw_copy(pfd, tfd, pw, old_pw) == -1) { 267 pw_fini(); 268 err(1, "pw_copy"); 269 } 270 if (pw_mkdb(pw->pw_name) == -1) { 271 pw_fini(); 272 err(1, "pw_mkdb()"); 273 } 274 pw_fini(); 275 errx(0, "user information updated"); 276 break; 277 default: 278 errx(1, "unsupported passwd source"); 279 } 280 } 281 282 static void 283 baduser(void) 284 { 285 286 errx(1, "%s", strerror(EACCES)); 287 } 288 289 static void 290 usage(void) 291 { 292 293 (void)fprintf(stderr, 294 "usage: chpass%s %s [user]\n", 295 #ifdef YP 296 " [-d domain] [-h host]", 297 #else 298 "", 299 #endif 300 "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]"); 301 exit(1); 302 } 303