chpass.c revision 96201 
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 96201 2002-05-08 00:54:29Z des $");
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
85char localhost[] = "localhost";
86
87int
88main(int argc, char *argv[])
89{
90	enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op;
91	struct passwd *pw = NULL, lpw, *old_pw;
92	int ch, pfd, tfd;
93	const char *password;
94	char *arg = NULL;
95	uid_t uid;
96#ifdef YP
97	struct ypclnt *ypclnt;
98	const char *yp_domain = NULL, *yp_host = NULL;
99#endif
100
101	op = EDITENTRY;
102#ifdef YP
103	while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1)
104#else
105	while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1)
106#endif
107		switch (ch) {
108		case 'a':
109			op = LOADENTRY;
110			arg = optarg;
111			break;
112		case 's':
113			op = NEWSH;
114			arg = optarg;
115			break;
116		case 'p':
117			op = NEWPW;
118			arg = optarg;
119			break;
120		case 'e':
121			op = NEWEXP;
122			arg = optarg;
123			break;
124#ifdef YP
125		case 'd':
126			yp_domain = optarg;
127			break;
128		case 'h':
129			yp_host = optarg;
130			break;
131		case 'l':
132		case 'o':
133		case 'y':
134			/* compatibility */
135			break;
136#endif
137		case '?':
138		default:
139			usage();
140		}
141
142	argc -= optind;
143	argv += optind;
144
145	if (argc > 1)
146		usage();
147
148	uid = getuid();
149
150	if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) {
151		if (argc == 0) {
152			if ((pw = getpwuid(uid)) == NULL)
153				errx(1, "unknown user: uid %lu",
154				    (unsigned long)uid);
155		} else {
156			if ((pw = getpwnam(*argv)) == NULL)
157				errx(1, "unknown user: %s", *argv);
158			if (uid != 0 && uid != pw->pw_uid)
159				baduser();
160		}
161
162		/* Make a copy for later verification */
163		if ((pw = pw_dup(pw)) == NULL ||
164		    (old_pw = pw_dup(pw)) == NULL)
165			err(1, "pw_dup");
166	}
167
168#ifdef YP
169	if ((pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
170		ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
171		master_mode = (ypclnt != NULL &&
172		    ypclnt_connect(ypclnt) != -1 &&
173		    ypclnt_havepasswdd(ypclnt) == 1);
174		ypclnt_free(ypclnt);
175	} else
176#endif
177	master_mode = (uid == 0);
178
179	if (op == NEWSH) {
180		/* protect p_shell -- it thinks NULL is /bin/sh */
181		if (!arg[0])
182			usage();
183		if (p_shell(arg, pw, (ENTRY *)NULL) == -1)
184			exit(1);
185	}
186
187	if (op == NEWEXP) {
188		if (uid)	/* only root can change expire */
189			baduser();
190		if (p_expire(arg, pw, (ENTRY *)NULL) == -1)
191			exit(1);
192	}
193
194	if (op == LOADENTRY) {
195		if (uid)
196			baduser();
197		pw = &lpw;
198		old_pw = NULL;
199		if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER))
200			exit(1);
201	}
202
203	if (op == NEWPW) {
204		if (uid)
205			baduser();
206
207		if (strchr(arg, ':'))
208			errx(1, "invalid format for password");
209		pw->pw_passwd = arg;
210	}
211
212	if (op == EDITENTRY) {
213		/*
214		 * We don't really need pw_*() here, but pw_edit() (used
215		 * by edit()) is just too useful...
216		 */
217		if (pw_init(NULL, NULL))
218			err(1, "pw_init()");
219		if ((tfd = pw_tmp(-1)) == -1) {
220			pw_fini();
221			err(1, "pw_tmp()");
222		}
223		free(pw);
224		pw = edit(pw_tempname(), old_pw);
225		pw_fini();
226		if (pw == NULL)
227			err(1, "edit()");
228		if (pw_equal(old_pw, pw))
229			errx(0, "user information unchanged");
230	}
231
232	if (old_pw && !master_mode) {
233		password = getpass("Password: ");
234		if (strcmp(crypt(password, old_pw->pw_passwd),
235		    old_pw->pw_passwd) != 0)
236			baduser();
237	} else {
238		password = "";
239	}
240
241	if (old_pw != NULL)
242		pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE);
243	switch (pw->pw_fields & _PWF_SOURCE) {
244#ifdef YP
245	case _PWF_NIS:
246		ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
247		if (ypclnt == NULL ||
248		    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