d18b50bbf4
is not found. Fixes both PRs 4142 and 4557 (4558). Still fails properly if user is in YP and not in local database. Man page fixed to reflect current logic behind falling back, changed since YP was made default some time ago.
336 lines
8.4 KiB
C
336 lines
8.4 KiB
C
/* $NetBSD: yp_passwd.c,v 1.16 1997/11/21 20:28:35 tv Exp $ */
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/*
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* Copyright (c) 1988, 1990, 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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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "from: @(#)local_passwd.c 8.3 (Berkeley) 4/2/94";
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#else
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__RCSID("$NetBSD: yp_passwd.c,v 1.16 1997/11/21 20:28:35 tv Exp $");
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#endif
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#endif /* not lint */
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#ifdef YP
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <rpc/rpc.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.h>
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#include "extern.h"
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#define passwd yp_passwd_rec
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#include <rpcsvc/yppasswd.h>
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#undef passwd
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#ifndef _PASSWORD_LEN
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#define _PASSWORD_LEN PASS_MAX
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#endif
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extern char *__progname; /* from crt0.o */
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extern int yflag, yppwd;
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static char *getnewpasswd __P((struct passwd *, char **));
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static struct passwd *interpret __P((struct passwd *, char *));
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static struct passwd *ypgetpwnam __P((char *));
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static void pw_error __P((char *, int, int));
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static void test_local __P((char *));
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static uid_t uid;
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char *domain;
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static void
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pw_error(name, err, eval)
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char *name;
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int err, eval;
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{
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if (err)
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warn("%s", name ? name : "");
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errx(eval, "YP passwd database unchanged");
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}
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static void
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test_local(username)
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char *username;
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{
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/*
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* Something failed recoverably stating that the YP system couldn't
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* find this user. Look for a local passwd entry, and change that
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* if and only if we weren't run as yppasswd or with the -y option.
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* This function does not return if a local entry is found.
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*/
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if (yppwd == 0 && yflag == 0)
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if ((getpwnam(username) != NULL) && !local_passwd(username))
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exit(0);
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}
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int
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yp_passwd(username)
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char *username;
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{
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char *master;
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int r, rpcport, status;
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struct yppasswd yppasswd;
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struct passwd *pw;
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struct timeval tv;
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CLIENT *client;
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uid = getuid();
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/*
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* Get local domain
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*/
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if ((r = yp_get_default_domain(&domain)) != NULL)
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errx(1, "can't get local YP domain. Reason: %s",
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yperr_string(r));
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/*
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* Find the host for the passwd map; it should be running
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* the daemon.
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*/
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if ((r = yp_master(domain, "passwd.byname", &master)) != 0) {
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test_local(username);
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errx(1, "can't find the master YP server. Reason: %s",
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yperr_string(r));
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}
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/*
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* Ask the portmapper for the port of the daemon.
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*/
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if ((rpcport = getrpcport(master, YPPASSWDPROG,
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YPPASSWDPROC_UPDATE, IPPROTO_UDP)) == 0) {
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test_local(username);
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errx(1, "master YP server not running yppasswd daemon.\n\t%s\n",
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"Can't change password.");
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}
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/*
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* Be sure the port is priviledged
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*/
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if (rpcport >= IPPORT_RESERVED)
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errx(1, "yppasswd daemon is on an invalid port.");
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/* Get user's login identity */
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if (!(pw = ypgetpwnam(username))) {
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test_local(username);
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errx(1, "unknown user %s", username);
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}
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if (uid && uid != pw->pw_uid)
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errx(1, "you may only change your own password: %s",
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strerror(EACCES));
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/* prompt for new password */
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yppasswd.newpw.pw_passwd = getnewpasswd(pw, &yppasswd.oldpass);
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/* tell rpc.yppasswdd */
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yppasswd.newpw.pw_name = pw->pw_name;
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yppasswd.newpw.pw_uid = pw->pw_uid;
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yppasswd.newpw.pw_gid = pw->pw_gid;
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yppasswd.newpw.pw_gecos = pw->pw_gecos;
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yppasswd.newpw.pw_dir = pw->pw_dir;
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yppasswd.newpw.pw_shell = pw->pw_shell;
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client = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
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if (client==NULL) {
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warnx("cannot contact yppasswdd on %s: Reason: %s",
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master, yperr_string(YPERR_YPBIND));
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return(YPERR_YPBIND);
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}
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client->cl_auth = authunix_create_default();
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tv.tv_sec = 2;
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tv.tv_usec = 0;
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r = clnt_call(client, YPPASSWDPROC_UPDATE,
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xdr_yppasswd, &yppasswd, xdr_int, &status, tv);
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if (r)
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errx(1, "rpc to yppasswdd failed.");
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else if (status)
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printf("Couldn't change YP password.\n");
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else
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printf("The YP password has been changed on %s, %s\n",
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master, "the master YP passwd server.");
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exit(0);
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}
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static char *
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getnewpasswd(pw, old_pass)
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struct passwd *pw;
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char **old_pass;
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{
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int tries;
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char *p, *t;
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static char buf[_PASSWORD_LEN+1];
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char salt[9];
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(void)printf("Changing YP password for %s.\n", pw->pw_name);
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if (old_pass) {
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*old_pass = NULL;
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if (pw->pw_passwd[0]) {
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if (strcmp(crypt(p = getpass("Old password:"),
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pw->pw_passwd), pw->pw_passwd)) {
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errno = EACCES;
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pw_error(NULL, 1, 1);
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}
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} else {
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p = "";
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}
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*old_pass = strdup(p);
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}
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for (buf[0] = '\0', tries = 0;;) {
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p = getpass("New password:");
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if (!*p) {
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(void)printf("Password unchanged.\n");
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pw_error(NULL, 0, 0);
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}
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if (strlen(p) <= 5 && ++tries < 2) {
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(void)printf("Please enter a longer password.\n");
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continue;
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}
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for (t = p; *t && islower(*t); ++t);
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if (!*t && ++tries < 2) {
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(void)printf("Please don't use an all-lower case "
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"password.\nUnusual capitalization, "
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"control characters or digits are "
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"suggested.\n");
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continue;
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}
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(void)strncpy(buf, p, sizeof(buf) - 1);
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if (!strcmp(buf, getpass("Retype new password:")))
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break;
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(void)printf("Mismatch; try again, EOF to quit.\n");
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}
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/* grab a random printable character that isn't a colon */
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(void)srandom((int)time((time_t *)NULL));
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#ifdef NEWSALT
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salt[0] = _PASSWORD_EFMT1;
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to64(&salt[1], (long)(29 * 25), 4);
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to64(&salt[5], random(), 4);
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#else
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to64(&salt[0], random(), 2);
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#endif
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return(strdup(crypt(buf, salt)));
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}
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static char *
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pwskip(char *p)
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{
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while (*p && *p != ':' && *p != '\n')
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++p;
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if (*p)
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*p++ = 0;
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return (p);
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}
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static struct passwd *
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interpret(pwent, line)
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struct passwd *pwent;
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char *line;
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{
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char *p = line;
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pwent->pw_passwd = "*";
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pwent->pw_uid = 0;
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pwent->pw_gid = 0;
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pwent->pw_gecos = "";
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pwent->pw_dir = "";
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pwent->pw_shell = "";
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pwent->pw_change = 0;
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pwent->pw_expire = 0;
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pwent->pw_class = "";
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/* line without colon separators is no good, so ignore it */
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if(!strchr(p,':'))
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return(NULL);
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pwent->pw_name = p;
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p = pwskip(p);
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pwent->pw_passwd = p;
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p = pwskip(p);
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pwent->pw_uid = (uid_t)strtoul(p, NULL, 10);
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p = pwskip(p);
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pwent->pw_gid = (gid_t)strtoul(p, NULL, 10);
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p = pwskip(p);
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pwent->pw_gecos = p;
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p = pwskip(p);
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pwent->pw_dir = p;
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p = pwskip(p);
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pwent->pw_shell = p;
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while (*p && *p != '\n')
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p++;
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*p = '\0';
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return (pwent);
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}
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static struct passwd *
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ypgetpwnam(nam)
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char *nam;
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{
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static struct passwd pwent;
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static char line[1024];
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char *val;
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int reason, vallen;
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val = NULL;
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reason = yp_match(domain, "passwd.byname", nam, strlen(nam),
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&val, &vallen);
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if (reason != 0) {
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if (val != NULL)
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free(val);
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return (NULL);
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}
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val[vallen] = '\0';
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(void)strncpy(line, val, sizeof(line) - 1);
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free(val);
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return(interpret(&pwent, line));
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}
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#endif /* YP */
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