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- /*-
- * Copyright (c) 1990 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 5.4 (Berkeley) 3/1/91";
- #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 */
-