chpass.c revision 108434 
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
42static 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
49static 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: head/usr.bin/chpass/chpass.c 108434 2002-12-30 09:45:26Z obrien $");
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
80int master_mode;
81
82static void	baduser(void);
83static void	usage(void);
84
85int
86main(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
284static void
285baduser(void)
286{
287
288	errx(1, "%s", strerror(EACCES));
289}
290
291static void
292usage(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