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
37 RCSID("$Id: krb4encpwd.c,v 1.17 1998/07/09 23:16:29 assar Exp $");
41 * COPYRIGHT (C) 1990 DIGITAL EQUIPMENT CORPORATION
44 * "Digital Equipment Corporation authorizes the reproduction,
45 * distribution and modification of this software subject to the following
48 * 1. Any partial or whole copy of this software, or any modification
49 * thereof, must include this copyright notice in its entirety.
51 * 2. This software is supplied "as is" with no warranty of any kind,
52 * expressed or implied, for any purpose, including any warranty of fitness
53 * or merchantibility. DIGITAL assumes no responsibility for the use or
54 * reliability of this software, nor promises to provide any form of
55 * support for it on any basis.
57 * 3. Distribution of this software is authorized only if no profit or
58 * remuneration of any kind is received in exchange for such distribution.
60 * 4. This software produces public key authentication certificates
61 * bearing an expiration date established by DIGITAL and RSA Data
62 * Security, Inc. It may cease to generate certificates after the expiration
63 * date. Any modification of this software that changes or defeats
64 * the expiration date or its effect is unauthorized.
66 * 5. Software that will renew or extend the expiration date of
67 * authentication certificates produced by this software may be obtained
68 * from RSA Data Security, Inc., 10 Twin Dolphin Drive, Redwood City, CA
69 * 94065, (415)595-8782, or from DIGITAL"
73 #include <sys/types.h>
74 #include <arpa/telnet.h>
78 #include <openssl/des.h>
90 int krb_mk_encpwd_req (KTEXT, char *, char *, char *, char *, char *, char *);
91 int krb_rd_encpwd_req (KTEXT, char *, char *, u_long, AUTH_DAT *, char *, char *, char *, char *);
93 extern auth_debug_mode;
95 static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
96 AUTHTYPE_KRB4_ENCPWD, };
97 static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
100 #define KRB4_ENCPWD_AUTH 0 /* Authentication data follows */
101 #define KRB4_ENCPWD_REJECT 1 /* Rejected (reason might follow) */
102 #define KRB4_ENCPWD_ACCEPT 2 /* Accepted */
103 #define KRB4_ENCPWD_CHALLENGE 3 /* Challenge for mutual auth. */
104 #define KRB4_ENCPWD_ACK 4 /* Acknowledge */
106 #define KRB_SERVICE_NAME "rcmd"
108 static KTEXT_ST auth;
109 static char name[ANAME_SZ];
110 static char user_passwd[ANAME_SZ];
111 static AUTH_DAT adat = { 0 };
112 static des_key_schedule sched;
113 static char challenge[REALM_SZ];
122 unsigned char *p = str_data + 4;
123 unsigned char *cd = (unsigned char *)d;
129 printf("%s:%d: [%d] (%d)",
130 str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
140 if ((*p++ = *cd++) == IAC)
145 if (str_data[3] == TELQUAL_IS)
146 printsub('>', &str_data[2], p - (&str_data[2]));
147 return(telnet_net_write(str_data, p - str_data));
151 krb4encpwd_init(ap, server)
155 char hostname[80], *cp, *realm;
159 str_data[3] = TELQUAL_REPLY;
161 str_data[3] = TELQUAL_IS;
162 gethostname(hostname, sizeof(hostname));
163 realm = krb_realmofhost(hostname);
164 cp = strchr(hostname, '.');
165 if (*cp != NULL) *cp = NULL;
166 if (read_service_key(KRB_SERVICE_NAME, hostname, realm, 0,
167 KEYFILE, (char *)skey)) {
179 printf("[ Trying KRB4ENCPWD ... ]\r\n");
180 if (!UserNameRequested) {
183 if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
187 if (!Data(ap, KRB4_ENCPWD_ACK, NULL, 0)) {
195 krb4encpwd_is(ap, data, cnt)
201 des_cblock datablock;
202 char r_passwd[ANAME_SZ], r_user[ANAME_SZ];
203 char lhostname[ANAME_SZ], *cp;
210 case KRB4_ENCPWD_AUTH:
211 memmove(auth.dat, data, auth.length = cnt);
213 gethostname(lhostname, sizeof(lhostname));
214 if ((cp = strchr(lhostname, '.')) != 0) *cp = '\0';
216 if (r = krb_rd_encpwd_req(&auth, KRB_SERVICE_NAME, lhostname, 0, &adat, NULL, challenge, r_user, r_passwd)) {
217 Data(ap, KRB4_ENCPWD_REJECT, "Auth failed", -1);
218 auth_finished(ap, AUTH_REJECT);
221 auth_encrypt_userpwd(r_passwd);
222 if (passwdok(UserNameRequested, UserPassword) == 0) {
224 * illegal username and password
226 Data(ap, KRB4_ENCPWD_REJECT, "Illegal password", -1);
227 auth_finished(ap, AUTH_REJECT);
231 memmove(session_key, adat.session, sizeof(des_cblock));
232 Data(ap, KRB4_ENCPWD_ACCEPT, 0, 0);
233 auth_finished(ap, AUTH_USER);
236 case KRB4_ENCPWD_CHALLENGE:
238 * Take the received random challenge text and save
239 * for future authentication.
241 memmove(challenge, data, sizeof(des_cblock));
245 case KRB4_ENCPWD_ACK:
247 * Receive ack, if mutual then send random challenge
251 * If we are doing mutual authentication, get set up to send
252 * the challenge, and verify it when the response comes back.
255 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
259 snprintf(challenge, sizeof(challenge), "%x", now);
260 Data(ap, KRB4_ENCPWD_CHALLENGE, challenge, strlen(challenge));
265 Data(ap, KRB4_ENCPWD_REJECT, 0, 0);
272 krb4encpwd_reply(ap, data, cnt)
282 char randchal[REALM_SZ], instance[ANAME_SZ], *cp;
283 char hostname[80], *realm;
288 case KRB4_ENCPWD_REJECT:
290 printf("[ KRB4_ENCPWD refuses authentication because %.*s ]\r\n",
293 printf("[ KRB4_ENCPWD refuses authentication ]\r\n");
296 case KRB4_ENCPWD_ACCEPT:
297 printf("[ KRB4_ENCPWD accepts you ]\r\n");
298 auth_finished(ap, AUTH_USER);
300 case KRB4_ENCPWD_CHALLENGE:
302 * Verify that the response to the challenge is correct.
305 gethostname(hostname, sizeof(hostname));
306 realm = krb_realmofhost(hostname);
307 memmove(challenge, data, cnt);
308 memset(user_passwd, 0, sizeof(user_passwd));
309 des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0);
310 UserPassword = user_passwd;
311 Challenge = challenge;
312 strcpy_truncate(instance, RemoteHostName, sizeof(instance));
313 if ((cp = strchr(instance, '.')) != 0) *cp = '\0';
315 if (r = krb_mk_encpwd_req(&krb_token, KRB_SERVICE_NAME, instance, realm, Challenge, UserNameRequested, user_passwd)) {
316 krb_token.length = 0;
319 if (!Data(ap, KRB4_ENCPWD_AUTH, krb_token.dat, krb_token.length)) {
331 krb4encpwd_status(ap, name, name_sz, level)
338 if (level < AUTH_USER)
341 if (UserNameRequested && passwdok(UserNameRequested, UserPassword)) {
342 strcpy_truncate(name, UserNameRequested, name_sz);
349 #define BUMP(buf, len) while (*(buf)) {++(buf), --(len);}
350 #define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}
353 krb4encpwd_printsub(data, cnt, buf, buflen)
354 unsigned char *data, *buf;
359 buf[buflen-1] = '\0'; /* make sure its NULL terminated */
363 case KRB4_ENCPWD_REJECT: /* Rejected (reason might follow) */
364 strcpy_truncate((char *)buf, " REJECT ", buflen);
367 case KRB4_ENCPWD_ACCEPT: /* Accepted (name might follow) */
368 strcpy_truncate((char *)buf, " ACCEPT ", buflen);
373 ADDC(buf, buflen, '"');
374 for (i = 4; i < cnt; i++)
375 ADDC(buf, buflen, data[i]);
376 ADDC(buf, buflen, '"');
377 ADDC(buf, buflen, '\0');
380 case KRB4_ENCPWD_AUTH: /* Authentication data follows */
381 strcpy_truncate((char *)buf, " AUTH", buflen);
384 case KRB4_ENCPWD_CHALLENGE:
385 strcpy_truncate((char *)buf, " CHALLENGE", buflen);
388 case KRB4_ENCPWD_ACK:
389 strcpy_truncate((char *)buf, " ACK", buflen);
393 snprintf(buf, buflen, " %d (unknown)", data[3]);
396 for (i = 4; i < cnt; i++) {
397 snprintf(buf, buflen, " %d", data[i]);
404 int passwdok(name, passwd)
410 int passwdok_status = 0;
412 if (pwd = k_getpwnam(name))
413 salt = pwd->pw_passwd;
416 p = crypt(passwd, salt);
418 if (pwd && !strcmp(p, pwd->pw_passwd)) {
420 } else passwdok_status = 0;
421 return(passwdok_status);
434 for (i = 0; i < 8; i++)
435 printf(" %3d", key[i]);