2 * Copyright (c) 1988, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
35 static char copyright[] =
36 "@(#) Copyright (c) 1988, 1993, 1994\n\
37 The Regents of the University of California. All rights reserved.\n";
41 static char sccsid[] = "@(#)chpass.c 8.4 (Berkeley) 4/2/94";
44 #include <sys/param.h>
46 #include <sys/signal.h>
48 #include <sys/resource.h>
65 #include "pathnames.h"
67 char *progname = "chpass";
71 void baduser __P((void));
72 void usage __P((void));
79 enum { NEWSH, LOADENTRY, EDITENTRY } op;
80 struct passwd *pw, lpw;
85 while ((ch = getopt(argc, argv, "a:s:")) != EOF)
104 if (op == EDITENTRY || op == NEWSH)
107 if (!(pw = getpwuid(uid)))
108 errx(1, "unknown user: uid %u", uid);
111 if (!(pw = getpwnam(*argv)))
112 errx(1, "unknown user: %s", *argv);
113 if (uid && uid != pw->pw_uid)
121 /* protect p_shell -- it thinks NULL is /bin/sh */
124 if (p_shell(arg, pw, (ENTRY *)NULL))
125 pw_error((char *)NULL, 0, 1);
128 if (op == LOADENTRY) {
132 if (!pw_scan(arg, pw))
137 * The temporary file/file descriptor usage is a little tricky here.
138 * 1: We start off with two fd's, one for the master password
139 * file (used to lock everything), and one for a temporary file.
140 * 2: Display() gets an fp for the temporary file, and copies the
141 * user's information into it. It then gives the temporary file
142 * to the user and closes the fp, closing the underlying fd.
143 * 3: The user edits the temporary file some number of times.
144 * 4: Verify() gets an fp for the temporary file, and verifies the
145 * contents. It can't use an fp derived from the step #2 fd,
146 * because the user's editor may have created a new instance of
147 * the file. Once the file is verified, its contents are stored
148 * in a password structure. The verify routine closes the fp,
149 * closing the underlying fd.
150 * 5: Delete the temporary file.
151 * 6: Get a new temporary file/fd. Pw_copy() gets an fp for it
152 * file and copies the master password file into it, replacing
153 * the user record with a new one. We can't use the first
154 * temporary file for this because it was owned by the user.
155 * Pw_copy() closes its fp, flushing the data and closing the
156 * underlying file descriptor. We can't close the master
157 * password fp, or we'd lose the lock.
158 * 7: Call pw_mkdb() (which renames the temporary file) and exit.
159 * The exit closes the master passwd fp/fd.
165 if (op == EDITENTRY) {
168 (void)unlink(tempname);
172 pw_copy(pfd, tfd, pw);
175 pw_error((char *)NULL, 0, 1);
183 errx(1, "%s", strerror(EACCES));
190 (void)fprintf(stderr, "usage: chpass [-a list] [-s shell] [user]\n");