chpass.c revision 13274 
1/*-
2 * Copyright (c) 1988, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char copyright[] =
36"@(#) Copyright (c) 1988, 1993, 1994\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "From: @(#)chpass.c	8.4 (Berkeley) 4/2/94";
42static char rcsid[] =
43	"$Id: chpass.c,v 1.5 1995/09/02 03:56:17 wpaul Exp $";
44#endif /* not lint */
45
46#include <sys/param.h>
47#include <sys/stat.h>
48#include <sys/signal.h>
49#include <sys/time.h>
50#include <sys/resource.h>
51
52#include <ctype.h>
53#include <err.h>
54#include <errno.h>
55#include <fcntl.h>
56#include <pwd.h>
57#include <stdio.h>
58#include <stdlib.h>
59#include <string.h>
60#include <unistd.h>
61
62#include <pw_scan.h>
63#include <pw_util.h>
64#include "pw_copy.h"
65#ifdef YP
66#include "pw_yp.h"
67#endif
68
69#include "chpass.h"
70#include "pathnames.h"
71
72char *progname = "chpass";
73char *tempname;
74uid_t uid;
75
76void	baduser __P((void));
77void	usage __P((void));
78
79int
80main(argc, argv)
81	int argc;
82	char **argv;
83{
84	enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW } op;
85	struct passwd *pw, lpw;
86	int ch, pfd, tfd;
87	char *arg;
88#ifdef YP
89	int force_local = 0;
90	int force_yp = 0;
91#endif
92
93	op = EDITENTRY;
94#ifdef YP
95	while ((ch = getopt(argc, argv, "a:p:s:ly")) != EOF)
96#else
97	while ((ch = getopt(argc, argv, "a:p:s:")) != EOF)
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#ifdef YP
113		case 'l':
114			force_local = 1;
115			break;
116		case 'y':
117			force_yp = 1;
118			break;
119#endif
120		case '?':
121		default:
122			usage();
123		}
124	argc -= optind;
125	argv += optind;
126
127	uid = getuid();
128
129	if (op == EDITENTRY || op == NEWSH || op == NEWPW)
130		switch(argc) {
131		case 0:
132			if (!(pw = getpwuid(uid)))
133				errx(1, "unknown user: uid %u", uid);
134			break;
135		case 1:
136			if (!(pw = getpwnam(*argv)))
137				errx(1, "unknown user: %s", *argv);
138			if (uid && uid != pw->pw_uid)
139				baduser();
140			break;
141		default:
142			usage();
143		}
144
145#ifdef YP
146	pw->pw_name = strdup(pw->pw_name);
147	_use_yp = use_yp(pw->pw_name);
148	if (_use_yp == USER_YP_ONLY) {
149		if (!force_local) {
150			_use_yp = 1;
151			pw = (struct passwd *)&yp_password;
152		} else
153			errx(1, "unknown local user: %s.", pw->pw_name);
154	} else if (_use_yp == USER_LOCAL_ONLY) {
155		if (!force_yp) {
156			_use_yp = 0;
157			pw = (struct passwd *)&local_password;
158		} else
159			errx(1, "unknown NIS user: %s.", pw->pw_name);
160	} else if (_use_yp == USER_YP_AND_LOCAL) {
161		if (!force_local) {
162			_use_yp = 1;
163			pw = (struct passwd *)&yp_password;
164		} else {
165			_use_yp = 0;
166			pw = (struct passwd *)&local_password;
167		}
168	}
169#endif /* YP */
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))
176			pw_error((char *)NULL, 0, 1);
177	}
178
179	if (op == LOADENTRY) {
180		if (uid)
181			baduser();
182		pw = &lpw;
183		if (!pw_scan(arg, pw))
184			exit(1);
185	}
186
187	if (op == NEWPW) {
188		if (uid)
189			baduser();
190
191		if(strchr(arg, ':')) {
192			errx(1, "invalid format for password");
193		}
194		pw->pw_passwd = arg;
195	}
196
197	/*
198	 * The temporary file/file descriptor usage is a little tricky here.
199	 * 1:	We start off with two fd's, one for the master password
200	 *	file (used to lock everything), and one for a temporary file.
201	 * 2:	Display() gets an fp for the temporary file, and copies the
202	 *	user's information into it.  It then gives the temporary file
203	 *	to the user and closes the fp, closing the underlying fd.
204	 * 3:	The user edits the temporary file some number of times.
205	 * 4:	Verify() gets an fp for the temporary file, and verifies the
206	 *	contents.  It can't use an fp derived from the step #2 fd,
207	 *	because the user's editor may have created a new instance of
208	 *	the file.  Once the file is verified, its contents are stored
209	 *	in a password structure.  The verify routine closes the fp,
210	 *	closing the underlying fd.
211	 * 5:	Delete the temporary file.
212	 * 6:	Get a new temporary file/fd.  Pw_copy() gets an fp for it
213	 *	file and copies the master password file into it, replacing
214	 *	the user record with a new one.  We can't use the first
215	 *	temporary file for this because it was owned by the user.
216	 *	Pw_copy() closes its fp, flushing the data and closing the
217	 *	underlying file descriptor.  We can't close the master
218	 *	password fp, or we'd lose the lock.
219	 * 7:	Call pw_mkdb() (which renames the temporary file) and exit.
220	 *	The exit closes the master passwd fp/fd.
221	 */
222	pw_init();
223	pfd = pw_lock();
224	tfd = pw_tmp();
225
226	if (op == EDITENTRY) {
227		display(tfd, pw);
228		edit(pw);
229		(void)unlink(tempname);
230		tfd = pw_tmp();
231	}
232
233#ifdef YP
234	if (_use_yp) {
235		yp_submit(pw);
236		(void)unlink(tempname);
237	} else {
238#endif /* YP */
239	pw_copy(pfd, tfd, pw);
240
241	if (!pw_mkdb())
242		pw_error((char *)NULL, 0, 1);
243#ifdef YP
244	}
245#endif /* YP */
246	exit(0);
247}
248
249void
250baduser()
251{
252	errx(1, "%s", strerror(EACCES));
253}
254
255void
256usage()
257{
258
259	(void)fprintf(stderr,
260#ifdef YP
261		"usage: chpass [-l] [-y] [-a list] [-p encpass] [-s shell] [user]\n");
262#else
263		"usage: chpass [-a list] [-p encpass] [-s shell] [user]\n");
264#endif
265	exit(1);
266}
267