xref: /freebsd/usr.bin/chpass/chpass.c (revision 6780ab54325a71e7e70112b11657973edde8655e)
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