343 lines
8.5 KiB
C
343 lines
8.5 KiB
C
/* $NetBSD: yp_passwd.c,v 1.19 1998/07/26 22:15:38 mycroft 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 1.19 1998/07/26 22:15:38 mycroft 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);
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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 = strdup(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 = strdup(pw->pw_gecos);
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yppasswd.newpw.pw_dir = strdup(pw->pw_dir);
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yppasswd.newpw.pw_shell = strdup(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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(void)printf("Sorry.\n");
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pw_error(NULL, 0, 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 *pwskip __P((char *));
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static char *
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pwskip(p)
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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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line[sizeof(line) - 1] = '\0';
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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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