4.4BSD/usr/src/usr.bin/passwd/krb_passwd.c
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. 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 the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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.
*/
#ifndef lint
static char sccsid[] = "@(#)krb_passwd.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#ifdef KERBEROS
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <netinet/in.h>
#include <kerberosIV/des.h>
#include <kerberosIV/krb.h>
#include <netdb.h>
#include <signal.h>
#include <pwd.h>
#include <errno.h>
#include <stdio.h>
#include "kpasswd_proto.h"
#include <string.h>
#include <stdlib.h>
#define PROTO "tcp"
static struct timeval timeout = { CLIENT_KRB_TIMEOUT, 0 };
static struct kpasswd_data proto_data;
static des_cblock okey;
static Key_schedule osched;
KTEXT_ST ticket;
Key_schedule random_schedule;
long authopts;
char realm[REALM_SZ], krbhst[MAX_HSTNM];
int sock;
krb_passwd()
{
struct servent *se;
struct hostent *host;
struct sockaddr_in sin;
CREDENTIALS cred;
fd_set readfds;
int rval;
char pass[_PASSWORD_LEN], password[_PASSWORD_LEN];
static void finish();
static struct rlimit rl = { 0, 0 };
(void)signal(SIGHUP, SIG_IGN);
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGTSTP, SIG_IGN);
if (setrlimit(RLIMIT_CORE, &rl) < 0) {
(void)fprintf(stderr,
"passwd: setrlimit: %s\n", strerror(errno));
return(1);
}
if ((se = getservbyname(SERVICE, PROTO)) == NULL) {
(void)fprintf(stderr,
"passwd: couldn't find entry for service %s/%s\n",
SERVICE, PROTO);
return(1);
}
if ((rval = krb_get_lrealm(realm,1)) != KSUCCESS) {
(void)fprintf(stderr,
"passwd: couldn't get local Kerberos realm: %s\n",
krb_err_txt[rval]);
return(1);
}
if ((rval = krb_get_krbhst(krbhst, realm, 1)) != KSUCCESS) {
(void)fprintf(stderr,
"passwd: couldn't get Kerberos host: %s\n",
krb_err_txt[rval]);
return(1);
}
if ((host = gethostbyname(krbhst)) == NULL) {
(void)fprintf(stderr,
"passwd: couldn't get host entry for krb host %s\n",
krbhst);
return(1);
}
sin.sin_family = host->h_addrtype;
bcopy(host->h_addr, (char *) &sin.sin_addr, host->h_length);
sin.sin_port = se->s_port;
if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
(void)fprintf(stderr, "passwd: socket: %s\n", strerror(errno));
return(1);
}
if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
(void)fprintf(stderr, "passwd: connect: %s\n", strerror(errno));
(void)close(sock);
return(1);
}
rval = krb_sendauth(
authopts, /* NOT mutual */
sock,
&ticket, /* (filled in) */
SERVICE,
krbhst, /* instance (krbhst) */
realm, /* dest realm */
(u_long) getpid(), /* checksum */
NULL, /* msg data */
NULL, /* credentials */
NULL, /* schedule */
NULL, /* local addr */
NULL, /* foreign addr */
"KPWDV0.1"
);
if (rval != KSUCCESS) {
(void)fprintf(stderr, "passwd: Kerberos sendauth error: %s\n",
krb_err_txt[rval]);
return(1);
}
krb_get_cred("krbtgt", realm, realm, &cred);
(void)printf("Changing Kerberos password for %s.%s@%s.\n",
cred.pname, cred.pinst, realm);
if (des_read_pw_string(pass,
sizeof(pass)-1, "Old Kerberos password:", 0)) {
(void)fprintf(stderr,
"passwd: error reading old Kerberos password\n");
return(1);
}
(void)des_string_to_key(pass, okey);
(void)des_key_sched(okey, osched);
(void)des_set_key(okey, osched);
/* wait on the verification string */
FD_ZERO(&readfds);
FD_SET(sock, &readfds);
rval =
select(sock + 1, &readfds, (fd_set *) 0, (fd_set *) 0, &timeout);
if ((rval < 1) || !FD_ISSET(sock, &readfds)) {
if(rval == 0) {
(void)fprintf(stderr, "passwd: timed out (aborted)\n");
cleanup();
return(1);
}
(void)fprintf(stderr, "passwd: select failed (aborted)\n");
cleanup();
return(1);
}
/* read verification string */
if (des_read(sock, &proto_data, sizeof(proto_data)) !=
sizeof(proto_data)) {
(void)fprintf(stderr,
"passwd: couldn't read verification string (aborted)\n");
cleanup();
return(1);
}
(void)signal(SIGHUP, finish);
(void)signal(SIGINT, finish);
if (strcmp(SECURE_STRING, proto_data.secure_msg) != 0) {
cleanup();
/* don't complain loud if user just hit return */
if (pass == NULL || (!*pass))
return(0);
(void)fprintf(stderr, "Sorry\n");
return(1);
}
(void)des_key_sched(proto_data.random_key, random_schedule);
(void)des_set_key(proto_data.random_key, random_schedule);
(void)bzero(pass, sizeof(pass));
if (des_read_pw_string(pass,
sizeof(pass)-1, "New Kerberos password:", 0)) {
(void)fprintf(stderr,
"passwd: error reading new Kerberos password (aborted)\n");
cleanup();
return(1);
}
if (des_read_pw_string(password,
sizeof(password)-1, "Retype new Kerberos password:", 0)) {
(void)fprintf(stderr,
"passwd: error reading new Kerberos password (aborted)\n");
cleanup();
return(1);
}
if (strcmp(password, pass) != 0) {
(void)fprintf(stderr,
"passwd: password mismatch (aborted)\n");
cleanup();
return(1);
}
if (strlen(pass) == 0)
(void)printf("using NULL password\n");
send_update(sock, password, SECURE_STRING);
/* wait for ACK */
FD_ZERO(&readfds);
FD_SET(sock, &readfds);
rval =
select(sock + 1, &readfds, (fd_set *) 0, (fd_set *) 0, &timeout);
if ((rval < 1) || !FD_ISSET(sock, &readfds)) {
if(rval == 0) {
(void)fprintf(stderr,
"passwd: timed out reading ACK (aborted)\n");
cleanup();
exit(1);
}
(void)fprintf(stderr, "passwd: select failed (aborted)\n");
cleanup();
exit(1);
}
recv_ack(sock);
cleanup();
exit(0);
}
send_update(dest, pwd, str)
int dest;
char *pwd, *str;
{
static struct update_data ud;
(void)strncpy(ud.secure_msg, str, _PASSWORD_LEN);
(void)strncpy(ud.pw, pwd, sizeof(ud.pw));
if (des_write(dest, &ud, sizeof(ud)) != sizeof(ud)) {
(void)fprintf(stderr,
"passwd: couldn't write pw update (abort)\n");
bzero((char *)&ud, sizeof(ud));
cleanup();
exit(1);
}
}
recv_ack(remote)
int remote;
{
int cc;
char buf[BUFSIZ];
cc = des_read(remote, buf, sizeof(buf));
if (cc <= 0) {
(void)fprintf(stderr,
"passwd: error reading acknowledgement (aborted)\n");
cleanup();
exit(1);
}
(void)printf("%s", buf);
}
cleanup()
{
(void)bzero((char *)&proto_data, sizeof(proto_data));
(void)bzero((char *)okey, sizeof(okey));
(void)bzero((char *)osched, sizeof(osched));
(void)bzero((char *)random_schedule, sizeof(random_schedule));
}
static void
finish()
{
(void)close(sock);
exit(1);
}
#endif /* KERBEROS */