1fbf1a4630
after I installed the last SNAP :). Because of the way the 'use NIS or local?' logic is set up here, it was possible to force the use of the NIS password changer even though the specified user didn't exist in NIS (i.e. # passwd foo, where foo is a local-only user). In this case, we fall intp yp_passwd() without the corresponding yp_password structure being filled in, which leads to an NULL pointer dereference. Also fixed the logic like I just did with chpass so that if the user is both in NIS and the local password database, the program makes a more sensible guess as to which one to use (if NIS is turned on in /etc/master.passwd, then use NIS, else default to local).
244 lines
5.6 KiB
C
244 lines
5.6 KiB
C
/*
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* Copyright (c) 1988, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $id$
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*
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1988, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static const char sccsid[] = "From: @(#)passwd.c 8.3 (Berkeley) 4/2/94";
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static const char rcsid[] =
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"$Id: passwd.c,v 1.8 1996/02/23 16:08:26 wpaul Exp $";
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#endif /* not lint */
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#ifdef YP
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#include <pwd.h>
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#include <pw_yp.h>
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#include <rpcsvc/yp.h>
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int __use_yp = 0;
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int yp_errno = YP_TRUE;
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extern int yp_passwd __P(( char * ));
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#endif
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#ifdef KERBEROS
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#include "krb.h"
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#endif
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#include "extern.h"
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void usage __P((void));
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int use_local_passwd = 0;
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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int ch;
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char *uname;
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char *iflag = 0, *rflag = 0, *uflag = 0;
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#ifdef YP
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#ifdef KERBEROS
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char realm[REALM_SZ];
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#define OPTIONS "d:h:lysfoi:r:u:"
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#else
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#define OPTIONS "d:h:lysfo"
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#endif
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#else
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#ifdef KERBEROS
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char realm[REALM_SZ];
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#define OPTIONS "li:r:u:"
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#else
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#define OPTIONS "l"
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#endif
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#endif
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#ifdef YP
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int res = 0;
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if (strstr(argv[0], "yppasswd")) __use_yp = 1;
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#endif
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while ((ch = getopt(argc, argv, OPTIONS)) != EOF) {
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switch (ch) {
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case 'l': /* change local password file */
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use_local_passwd = 1;
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break;
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#ifdef KERBEROS
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case 'i':
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iflag = optarg;
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break;
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case 'r':
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rflag = optarg;
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break;
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case 'u':
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uflag = optarg;
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break;
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#endif /* KERBEROS */
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#ifdef YP
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case 'y': /* Change NIS password */
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__use_yp = 1;
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break;
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case 'd': /* Specify NIS domain. */
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#ifdef PARANOID
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if (!getuid()) {
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#endif
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yp_domain = optarg;
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if (yp_server == NULL)
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yp_server = "localhost";
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#ifdef PARANOID
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} else {
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warnx("Only the super-user may use the -d flag.");
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}
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#endif
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break;
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case 'h': /* Specify NIS server. */
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#ifdef PARANOID
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if (!getuid()) {
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#endif
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yp_server = optarg;
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#ifdef PARANOID
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} else {
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warnx("Only the super-user may use the -h flag.");
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}
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#endif
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break;
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case 'o':
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force_old++;
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break;
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#endif
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default:
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case '?':
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if ((uname = getlogin()) == NULL)
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err(1, "getlogin");
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switch(argc) {
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case 0:
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break;
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case 1:
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uname = argv[0];
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break;
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default:
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usage();
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}
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#ifdef YP
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/*
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* If NIS is turned on in the password database, use it, else punt.
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*/
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#ifdef KERBEROS
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if (__use_yp || (iflag == NULL && rflag == NULL && uflag == NULL)) {
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#endif
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res = use_yp(uname, 0, 0);
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if (res == USER_YP_ONLY) {
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if (!use_local_passwd) {
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exit(yp_passwd(uname));
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} else {
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/*
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* Reject -l flag if NIS is turned on and the user
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* doesn't exist in the local password database.
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*/
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errx(1, "unknown local user: %s.", uname);
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}
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} else if (res == USER_LOCAL_ONLY) {
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/*
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* Reject -y flag if user only exists locally.
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*/
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if (__use_yp)
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errx(1, "unknown NIS user: %s.", uname);
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} else if (res == USER_YP_AND_LOCAL) {
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if (!use_local_passwd && (yp_in_pw_file || __use_yp))
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exit(yp_passwd(uname));
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}
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#ifdef KERBEROS
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}
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#endif
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#endif
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if (!use_local_passwd) {
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#ifdef KERBEROS
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if(krb_get_lrealm(realm, 0) == KSUCCESS) {
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fprintf(stderr, "realm %s\n", realm);
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exit(krb_passwd(argv[0], iflag, rflag, uflag));
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}
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#endif
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}
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exit(local_passwd(uname));
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}
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void
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usage()
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{
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#ifdef YP
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#ifdef KERBEROS
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fprintf(stderr,
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"usage: passwd [-l] [-i instance] [-r realm] [-u fullname]\n");
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fprintf(stderr,
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" [-l] [-y] [-o] [-d domain [-h host]] [user]\n");
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#else
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(void)fprintf(stderr, "usage: passwd [-l] [-y] [-o] [-d domain \
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[-h host]] [user] \n");
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#endif
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#else
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#ifdef KERBEROS
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fprintf(stderr,
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"usage: passwd [-l] [-i instance] [-r realm] [-u fullname] [user]\n");
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#else
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(void)fprintf(stderr, "usage: passwd user\n");
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#endif
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#endif
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exit(1);
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}
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