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/*
* Copyright (c) 1995
* Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Bill Paul.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* NIS interface routines for chpass
*
* Written by Bill Paul <wpaul@ctr.columbia.edu>
* Center for Telecommunications Research
* Columbia University, New York City
*
* $Id$
*/
#ifdef YP
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <time.h>
#include <sys/types.h>
#include <pwd.h>
#include <errno.h>
#include <err.h>
#include <unistd.h>
#include <db.h>
#include <fcntl.h>
#include <utmp.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <limits.h>
#include <rpc/rpc.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#include <rpcsvc/yppasswd.h>
#include <pw_util.h>
#include "pw_yp.h"
#define PERM_SECURE (S_IRUSR|S_IWUSR)
HASHINFO openinfo = {
4096, /* bsize */
32, /* ffactor */
256, /* nelem */
2048 * 1024, /* cachesize */
NULL, /* hash */
0, /* lorder */
};
int _use_yp = 0;
/*
* Check if the user we're working with is local or in NIS.
*/
int use_yp (user)
char *user;
{
int yp_enabled = 0, user_not_local = 0, exists = 0;
DB *dbp;
DBT key,data;
char bf[UT_NAMESIZE + 2];
if ((dbp = dbopen(_PATH_MP_DB, O_RDONLY, PERM_SECURE,
DB_HASH, &openinfo)) == NULL)
errx(1, "error opening database: %s.", _PATH_MP_DB);
bf[0] = _PW_KEYYPENABLED;
key.data = (u_char *)bf;
key.size = 1;
if (!(dbp->get)(dbp,&key,&data,0))
yp_enabled = 1;
bf[0] = _PW_KEYBYNAME;
bcopy((char *)user, bf + 1, MIN(strlen(user), UT_NAMESIZE));
key.data = (u_char *)bf;
key.size = strlen(user) + 1;
if ((dbp->get)(dbp,&key,&data,0))
user_not_local = 1;
(dbp->close)(dbp);
if (getpwnam(user) != NULL)
exists = 1;
if (yp_enabled && user_not_local && exists)
return(1);
else
return(0);
}
/*
* Find the name of the NIS master server for this domain
* and make sure it's running yppasswdd.
*/
static char *get_yp_master(void)
{
char *domain, *mastername;
int rval;
/* Get default NIS domain. */
if ((rval = yp_get_default_domain(&domain))) {
warnx("can't get local NIS domain name: %s",yperr_string(rval));
pw_error(NULL, 0, 1);
}
/* Get master server of passwd map. */
if ((rval = yp_master(domain, "passwd.byname", &mastername))) {
warnx("can't get master NIS server: %s", yperr_string(rval));
pw_error(NULL, 0, 1);
}
/* Check if yppasswdd is out there. */
if ((rval = getrpcport(mastername, YPPASSWDPROG, YPPASSWDPROC_UPDATE,
IPPROTO_UDP)) == 0) {
warnx("yppasswdd not running on NIS master server");
pw_error(NULL, 0, 1);
}
/*
* Make sure it's on a reserved port.
* XXX Might break with yppasswdd servers running on Solaris 2.x.
*/
if (rval >= IPPORT_RESERVED) {
warnx("yppasswdd server not running on reserved port");
pw_error(NULL, 0, 1);
}
/* Everything checks out: return the name of the server. */
return (mastername);
}
/*
* Ask the user for his NIS password and submit the new information
* to yppasswdd. Note that yppasswdd requires password authentication
* and only allows changes to existing records rather than the addition
* of new records. (To do actual updates we would need something like
* secure RPC and ypupdated, which FreeBSD doesn't have yet.) This means
* that the superuser cannot use chpass(1) to add new users records to
* the NIS password database.
*/
void yp_submit(pw)
struct passwd *pw;
{
struct yppasswd yppasswd;
CLIENT *clnt;
char *master, *password, *encpass;
int rval, status = 0;
struct timeval tv;
/* Populate the yppasswd structure that gets handed to yppasswdd. */
/*
* XXX This is done first to work around what looks like a very
* strange memory corruption bug: the text fields pointed to
* by the members of the 'pw' structure appear to be clobbered
* after get_yp_master() returns (in particular, it happens
* during getrpcport()). I don't know exactly where the problem
* lies: I traced it all the way to gethostbyname(), then gave
* up.
*/
yppasswd.newpw.pw_passwd = strdup(pw->pw_passwd);
yppasswd.newpw.pw_name = strdup(pw->pw_name);
yppasswd.newpw.pw_uid = pw->pw_uid;
yppasswd.newpw.pw_gid = pw->pw_gid;
yppasswd.newpw.pw_gecos = strdup(pw->pw_gecos);
yppasswd.newpw.pw_dir = strdup(pw->pw_dir);
yppasswd.newpw.pw_shell = strdup(pw->pw_shell);
/* Get NIS master server name */
master = get_yp_master();
/* Get the user's password for authentication purposes. */
printf ("Changing NIS information for %s on %s\n",
yppasswd.newpw.pw_name, master);
encpass = (getpwnam(yppasswd.newpw.pw_name))->pw_passwd;
password = getpass("Please enter password: ");
if (strncmp(crypt(password, encpass), encpass, strlen(encpass))) {
warnx("Password incorrect.");
pw_error(NULL, 0, 1);
}
yppasswd.oldpass = password; /* XXX */
/* Create a handle to yppasswdd. */
clnt = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
clnt->cl_auth = authunix_create_default();
/* Set a timeout and make the RPC call. */
tv.tv_sec = 20;
tv.tv_usec = 0;
rval = clnt_call(clnt, YPPASSWDPROC_UPDATE, xdr_yppasswd,
(char *)&yppasswd, xdr_int, (char *)&status, &tv);
/* Call failed: signal the error. */
if (rval) {
warnx("NIS update failed: %s", clnt_sperrno(rval));
pw_error(NULL, 0, 1);
}
/* Success. */
auth_destroy(clnt->cl_auth);
clnt_destroy(clnt);
warnx("NIS information changed on host %s", master);
return;
}
#endif /* YP */
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