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#if 0
42#ifndef lint
43static const char copyright[] =
44"@(#) Copyright (c) 1988, 1993, 1994\n\
45	The Regents of the University of California.  All rights reserved.\n";
46#endif /* not lint */
47
48#ifndef lint
49static char sccsid[] = "@(#)chpass.c	8.4 (Berkeley) 4/2/94";
50#endif /* not lint */
51#endif
52#include <sys/cdefs.h>
53__FBSDID("$FreeBSD$");
54
55#include <sys/param.h>
56
57#include <err.h>
58#include <errno.h>
59#include <pwd.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63#include <unistd.h>
64#ifdef YP
65#include <ypclnt.h>
66#endif
67
68#include <pw_scan.h>
69#include <libutil.h>
70
71#include "chpass.h"
72
73int master_mode;
74
75static void	baduser(void);
76static void	usage(void);
77
78int
79main(int argc, char *argv[])
80{
81	enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op;
82	struct passwd lpw, *old_pw, *pw;
83	int ch, pfd, tfd;
84	const char *password;
85	char *arg = NULL;
86	uid_t uid;
87#ifdef YP
88	struct ypclnt *ypclnt;
89	const char *yp_domain = NULL, *yp_host = NULL;
90#endif
91
92	pw = old_pw = NULL;
93	op = EDITENTRY;
94#ifdef YP
95	while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1)
96#else
97	while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1)
98#endif
99		switch (ch) {
100		case 'a':
101			op = LOADENTRY;
102			arg = optarg;
103			break;
104		case 's':
105			op = NEWSH;
106			arg = optarg;
107			break;
108		case 'p':
109			op = NEWPW;
110			arg = optarg;
111			break;
112		case 'e':
113			op = NEWEXP;
114			arg = optarg;
115			break;
116#ifdef YP
117		case 'd':
118			yp_domain = optarg;
119			break;
120		case 'h':
121			yp_host = optarg;
122			break;
123		case 'l':
124		case 'o':
125		case 'y':
126			/* compatibility */
127			break;
128#endif
129		case '?':
130		default:
131			usage();
132		}
133
134	argc -= optind;
135	argv += optind;
136
137	if (argc > 1)
138		usage();
139
140	uid = getuid();
141
142	if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) {
143		if (argc == 0) {
144			if ((pw = getpwuid(uid)) == NULL)
145				errx(1, "unknown user: uid %lu",
146				    (unsigned long)uid);
147		} else {
148			if ((pw = getpwnam(*argv)) == NULL)
149				errx(1, "unknown user: %s", *argv);
150			if (uid != 0 && uid != pw->pw_uid)
151				baduser();
152		}
153
154		/* Make a copy for later verification */
155		if ((pw = pw_dup(pw)) == NULL ||
156		    (old_pw = pw_dup(pw)) == NULL)
157			err(1, "pw_dup");
158	}
159
160#ifdef YP
161	if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
162		ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
163		master_mode = (ypclnt != NULL &&
164		    ypclnt_connect(ypclnt) != -1 &&
165		    ypclnt_havepasswdd(ypclnt) == 1);
166		ypclnt_free(ypclnt);
167	} else
168#endif
169	master_mode = (uid == 0);
170
171	if (op == NEWSH) {
172		/* protect p_shell -- it thinks NULL is /bin/sh */
173		if (!arg[0])
174			usage();
175		if (p_shell(arg, pw, (ENTRY *)NULL) == -1)
176			exit(1);
177	}
178
179	if (op == NEWEXP) {
180		if (uid)	/* only root can change expire */
181			baduser();
182		if (p_expire(arg, pw, (ENTRY *)NULL) == -1)
183			exit(1);
184	}
185
186	if (op == LOADENTRY) {
187		if (uid)
188			baduser();
189		pw = &lpw;
190		old_pw = NULL;
191		if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER))
192			exit(1);
193	}
194
195	if (op == NEWPW) {
196		if (uid)
197			baduser();
198
199		if (strchr(arg, ':'))
200			errx(1, "invalid format for password");
201		pw->pw_passwd = arg;
202	}
203
204	if (op == EDITENTRY) {
205		/*
206		 * We don't really need pw_*() here, but pw_edit() (used
207		 * by edit()) is just too useful...
208		 */
209		if (pw_init(NULL, NULL))
210			err(1, "pw_init()");
211		if ((tfd = pw_tmp(-1)) == -1) {
212			pw_fini();
213			err(1, "pw_tmp()");
214		}
215		free(pw);
216		pw = edit(pw_tempname(), old_pw);
217		pw_fini();
218		if (pw == NULL)
219			err(1, "edit()");
220		/*
221		 * pw_equal does not check for crypted passwords, so we
222		 * should do it explicitly
223		 */
224		if (pw_equal(old_pw, pw) &&
225		    strcmp(old_pw->pw_passwd, pw->pw_passwd) == 0)
226			errx(0, "user information unchanged");
227	}
228
229	if (old_pw && !master_mode) {
230		password = getpass("Password: ");
231		if (strcmp(crypt(password, old_pw->pw_passwd),
232		    old_pw->pw_passwd) != 0)
233			baduser();
234	} else {
235		password = "";
236	}
237
238	if (old_pw != NULL)
239		pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE);
240	switch (pw->pw_fields & _PWF_SOURCE) {
241#ifdef YP
242	case _PWF_NIS:
243		ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
244		if (ypclnt == NULL) {
245			warnx("ypclnt_new failed");
246			exit(1);
247		}
248		if (ypclnt_connect(ypclnt) == -1 ||
249		    ypclnt_passwd(ypclnt, pw, password) == -1) {
250			warnx("%s", ypclnt->error);
251			ypclnt_free(ypclnt);
252			exit(1);
253		}
254		ypclnt_free(ypclnt);
255		errx(0, "NIS user information updated");
256#endif /* YP */
257	case 0:
258	case _PWF_FILES:
259		if (pw_init(NULL, NULL))
260			err(1, "pw_init()");
261		if ((pfd = pw_lock()) == -1) {
262			pw_fini();
263			err(1, "pw_lock()");
264		}
265		if ((tfd = pw_tmp(-1)) == -1) {
266			pw_fini();
267			err(1, "pw_tmp()");
268		}
269		if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
270			pw_fini();
271			err(1, "pw_copy");
272		}
273		if (pw_mkdb(pw->pw_name) == -1) {
274			pw_fini();
275			err(1, "pw_mkdb()");
276		}
277		pw_fini();
278		errx(0, "user information updated");
279		break;
280	default:
281		errx(1, "unsupported passwd source");
282	}
283}
284
285static void
286baduser(void)
287{
288
289	errx(1, "%s", strerror(EACCES));
290}
291
292static void
293usage(void)
294{
295
296	(void)fprintf(stderr,
297	    "usage: chpass%s %s [user]\n",
298#ifdef YP
299	    " [-d domain] [-h host]",
300#else
301	    "",
302#endif
303	    "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]");
304	exit(1);
305}
306