2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)krb4encpwd.c 8.3 (Berkeley) 5/30/95
34 * $FreeBSD: src/crypto/telnet/libtelnet/krb4encpwd.c,v 1.3.2.1 2002/04/13 10:59:07 markm Exp $
39 * COPYRIGHT (C) 1990 DIGITAL EQUIPMENT CORPORATION
42 * "Digital Equipment Corporation authorizes the reproduction,
43 * distribution and modification of this software subject to the following
46 * 1. Any partial or whole copy of this software, or any modification
47 * thereof, must include this copyright notice in its entirety.
49 * 2. This software is supplied "as is" with no warranty of any kind,
50 * expressed or implied, for any purpose, including any warranty of fitness
51 * or merchantibility. DIGITAL assumes no responsibility for the use or
52 * reliability of this software, nor promises to provide any form of
53 * support for it on any basis.
55 * 3. Distribution of this software is authorized only if no profit or
56 * remuneration of any kind is received in exchange for such distribution.
58 * 4. This software produces public key authentication certificates
59 * bearing an expiration date established by DIGITAL and RSA Data
60 * Security, Inc. It may cease to generate certificates after the expiration
61 * date. Any modification of this software that changes or defeats
62 * the expiration date or its effect is unauthorized.
64 * 5. Software that will renew or extend the expiration date of
65 * authentication certificates produced by this software may be obtained
66 * from RSA Data Security, Inc., 10 Twin Dolphin Drive, Redwood City, CA
67 * 94065, (415)595-8782, or from DIGITAL"
71 #include <sys/types.h>
72 #include <openssl/des.h>
73 #include <arpa/telnet.h>
84 int krb_mk_encpwd_req(KTEXT, char *, char *, char *, char *, char *, char *);
85 int krb_rd_encpwd_req(KTEXT, char *, char *, u_long, AUTH_DAT *, char *, char *, char *, char *);
87 extern auth_debug_mode;
89 static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
90 AUTHTYPE_KRB4_ENCPWD, };
91 static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
94 #define KRB4_ENCPWD_AUTH 0 /* Authentication data follows */
95 #define KRB4_ENCPWD_REJECT 1 /* Rejected (reason might follow) */
96 #define KRB4_ENCPWD_ACCEPT 2 /* Accepted */
97 #define KRB4_ENCPWD_CHALLENGE 3 /* Challenge for mutual auth. */
98 #define KRB4_ENCPWD_ACK 4 /* Acknowledge */
100 #define KRB_SERVICE_NAME "rcmd"
102 static KTEXT_ST auth;
103 static char name[ANAME_SZ];
104 static char user_passwd[ANAME_SZ];
105 static AUTH_DAT adat = { 0 };
107 static Block session_key = { 0 };
108 #endif /* ENCRYPTION */
109 static char challenge[REALM_SZ];
118 unsigned char *p = str_data + 4;
119 unsigned char *cd = (unsigned char *)d;
122 c = strlen((char *)cd);
125 printf("%s:%d: [%d] (%d)",
126 str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
136 if ((*p++ = *cd++) == IAC)
141 if (str_data[3] == TELQUAL_IS)
142 printsub('>', &str_data[2], p - (&str_data[2]));
143 return(net_write(str_data, p - str_data));
147 krb4encpwd_init(ap, server)
151 char hostname[80], *cp, *realm;
155 str_data[3] = TELQUAL_REPLY;
157 str_data[3] = TELQUAL_IS;
158 gethostname(hostname, sizeof(hostname));
159 realm = krb_realmofhost(hostname);
160 cp = strchr(hostname, '.');
161 if (*cp != NULL) *cp = NULL;
162 if (read_service_key(KRB_SERVICE_NAME, hostname, realm, 0,
163 KEYFILE, (char *)skey)) {
175 printf("[ Trying KRB4ENCPWD ... ]\n");
176 if (!UserNameRequested) {
179 if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
183 if (!Data(ap, KRB4_ENCPWD_ACK, (void *)NULL, 0)) {
191 krb4encpwd_is(ap, data, cnt)
198 char r_passwd[ANAME_SZ], r_user[ANAME_SZ];
199 char lhostname[ANAME_SZ], *cp;
206 case KRB4_ENCPWD_AUTH:
207 memmove((void *)auth.dat, (void *)data, auth.length = cnt);
209 gethostname(lhostname, sizeof(lhostname));
210 if ((cp = strchr(lhostname, '.')) != NULL) *cp = '\0';
212 if (r = krb_rd_encpwd_req(&auth, KRB_SERVICE_NAME, lhostname, 0, &adat, NULL, challenge, r_user, r_passwd)) {
213 Data(ap, KRB4_ENCPWD_REJECT, (void *)"Auth failed", -1);
214 auth_finished(ap, AUTH_REJECT);
217 auth_encrypt_userpwd(r_passwd);
218 if (passwdok(UserNameRequested, UserPassword) == 0) {
220 * illegal username and password
222 Data(ap, KRB4_ENCPWD_REJECT, (void *)"Illegal password", -1);
223 auth_finished(ap, AUTH_REJECT);
227 memmove((void *)session_key, (void *)adat.session, sizeof(Block));
228 Data(ap, KRB4_ENCPWD_ACCEPT, (void *)0, 0);
229 auth_finished(ap, AUTH_USER);
232 case KRB4_ENCPWD_CHALLENGE:
234 * Take the received random challenge text and save
235 * for future authentication.
237 memmove((void *)challenge, (void *)data, sizeof(Block));
241 case KRB4_ENCPWD_ACK:
243 * Receive ack, if mutual then send random challenge
247 * If we are doing mutual authentication, get set up to send
248 * the challenge, and verify it when the response comes back.
251 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
255 sprintf(challenge, "%x", now);
256 Data(ap, KRB4_ENCPWD_CHALLENGE, (void *)challenge, strlen(challenge));
261 Data(ap, KRB4_ENCPWD_REJECT, 0, 0);
268 krb4encpwd_reply(ap, data, cnt)
278 char randchal[REALM_SZ], instance[ANAME_SZ], *cp;
279 char hostname[80], *realm;
284 case KRB4_ENCPWD_REJECT:
286 printf("[ KRB4_ENCPWD refuses authentication because %.*s ]\r\n",
289 printf("[ KRB4_ENCPWD refuses authentication ]\r\n");
292 case KRB4_ENCPWD_ACCEPT:
293 printf("[ KRB4_ENCPWD accepts you ]\n");
294 auth_finished(ap, AUTH_USER);
296 case KRB4_ENCPWD_CHALLENGE:
298 * Verify that the response to the challenge is correct.
301 gethostname(hostname, sizeof(hostname));
302 realm = krb_realmofhost(hostname);
303 memmove((void *)challenge, (void *)data, cnt);
304 memset(user_passwd, 0, sizeof(user_passwd));
305 local_des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0);
306 UserPassword = user_passwd;
307 Challenge = challenge;
308 strcpy(instance, RemoteHostName);
309 if ((cp = strchr(instance, '.')) != NULL) *cp = '\0';
311 if (r = krb_mk_encpwd_req(&krb_token, KRB_SERVICE_NAME, instance, realm, Challenge, UserNameRequested, user_passwd)) {
312 krb_token.length = 0;
315 if (!Data(ap, KRB4_ENCPWD_AUTH, (void *)krb_token.dat, krb_token.length)) {
327 krb4encpwd_status(ap, name, level)
333 if (level < AUTH_USER)
336 if (UserNameRequested && passwdok(UserNameRequested, UserPassword)) {
337 strcpy(name, UserNameRequested);
344 #define BUMP(buf, len) while (*(buf)) {++(buf), --(len);}
345 #define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}
348 krb4encpwd_printsub(data, cnt, buf, buflen)
349 unsigned char *data, *buf;
355 buf[buflen-1] = '\0'; /* make sure its NULL terminated */
359 case KRB4_ENCPWD_REJECT: /* Rejected (reason might follow) */
360 strncpy((char *)buf, " REJECT ", buflen);
363 case KRB4_ENCPWD_ACCEPT: /* Accepted (name might follow) */
364 strncpy((char *)buf, " ACCEPT ", buflen);
369 ADDC(buf, buflen, '"');
370 for (i = 4; i < cnt; i++)
371 ADDC(buf, buflen, data[i]);
372 ADDC(buf, buflen, '"');
373 ADDC(buf, buflen, '\0');
376 case KRB4_ENCPWD_AUTH: /* Authentication data follows */
377 strncpy((char *)buf, " AUTH", buflen);
380 case KRB4_ENCPWD_CHALLENGE:
381 strncpy((char *)buf, " CHALLENGE", buflen);
384 case KRB4_ENCPWD_ACK:
385 strncpy((char *)buf, " ACK", buflen);
389 sprintf(lbuf, " %d (unknown)", data[3]);
390 strncpy((char *)buf, lbuf, buflen);
393 for (i = 4; i < cnt; i++) {
394 sprintf(lbuf, " %d", data[i]);
395 strncpy((char *)buf, lbuf, buflen);
402 int passwdok(name, passwd)
408 int passwdok_status = 0;
410 if (pwd = getpwnam(name))
411 salt = pwd->pw_passwd;
414 p = crypt(passwd, salt);
416 if (pwd && !strcmp(p, pwd->pw_passwd)) {
418 } else passwdok_status = 0;
419 return(passwdok_status);