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
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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
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33 /* $FreeBSD: src/crypto/kerberosIV/appl/telnet/libtelnet/krb4encpwd.c,v 1.2.2.2 2003/02/13 21:34:35 nectar Exp $ */
37 RCSID("$Id: krb4encpwd.c,v 1.18 1999/09/16 20:41:34 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 #define OPENSSL_DES_LIBDES_COMPATIBILITY
79 #include <openssl/des.h>
91 int krb_mk_encpwd_req (KTEXT, char *, char *, char *, char *, char *, char *);
92 int krb_rd_encpwd_req (KTEXT, char *, char *, u_long, AUTH_DAT *, char *, char *, char *, char *);
94 extern auth_debug_mode;
96 static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
97 AUTHTYPE_KRB4_ENCPWD, };
98 static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
101 #define KRB4_ENCPWD_AUTH 0 /* Authentication data follows */
102 #define KRB4_ENCPWD_REJECT 1 /* Rejected (reason might follow) */
103 #define KRB4_ENCPWD_ACCEPT 2 /* Accepted */
104 #define KRB4_ENCPWD_CHALLENGE 3 /* Challenge for mutual auth. */
105 #define KRB4_ENCPWD_ACK 4 /* Acknowledge */
107 #define KRB_SERVICE_NAME "rcmd"
109 static KTEXT_ST auth;
110 static char name[ANAME_SZ];
111 static char user_passwd[ANAME_SZ];
112 static AUTH_DAT adat = { 0 };
113 static des_key_schedule sched;
114 static char challenge[REALM_SZ];
123 unsigned char *p = str_data + 4;
124 unsigned char *cd = (unsigned char *)d;
130 printf("%s:%d: [%d] (%d)",
131 str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
141 if ((*p++ = *cd++) == IAC)
146 if (str_data[3] == TELQUAL_IS)
147 printsub('>', &str_data[2], p - (&str_data[2]));
148 return(telnet_net_write(str_data, p - str_data));
152 krb4encpwd_init(ap, server)
156 char hostname[80], *cp, *realm;
160 str_data[3] = TELQUAL_REPLY;
162 str_data[3] = TELQUAL_IS;
163 gethostname(hostname, sizeof(hostname));
164 realm = krb_realmofhost(hostname);
165 cp = strchr(hostname, '.');
166 if (*cp != NULL) *cp = NULL;
167 if (read_service_key(KRB_SERVICE_NAME, hostname, realm, 0,
168 KEYFILE, (char *)skey)) {
180 printf("[ Trying KRB4ENCPWD ... ]\r\n");
181 if (!UserNameRequested) {
184 if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
188 if (!Data(ap, KRB4_ENCPWD_ACK, NULL, 0)) {
196 krb4encpwd_is(ap, data, cnt)
202 des_cblock datablock;
203 char r_passwd[ANAME_SZ], r_user[ANAME_SZ];
204 char lhostname[ANAME_SZ], *cp;
211 case KRB4_ENCPWD_AUTH:
212 memmove(auth.dat, data, auth.length = cnt);
214 gethostname(lhostname, sizeof(lhostname));
215 if ((cp = strchr(lhostname, '.')) != 0) *cp = '\0';
217 if (r = krb_rd_encpwd_req(&auth, KRB_SERVICE_NAME, lhostname, 0, &adat, NULL, challenge, r_user, r_passwd)) {
218 Data(ap, KRB4_ENCPWD_REJECT, "Auth failed", -1);
219 auth_finished(ap, AUTH_REJECT);
222 auth_encrypt_userpwd(r_passwd);
223 if (passwdok(UserNameRequested, UserPassword) == 0) {
225 * illegal username and password
227 Data(ap, KRB4_ENCPWD_REJECT, "Illegal password", -1);
228 auth_finished(ap, AUTH_REJECT);
232 memmove(session_key, adat.session, sizeof(des_cblock));
233 Data(ap, KRB4_ENCPWD_ACCEPT, 0, 0);
234 auth_finished(ap, AUTH_USER);
237 case KRB4_ENCPWD_CHALLENGE:
239 * Take the received random challenge text and save
240 * for future authentication.
242 memmove(challenge, data, sizeof(des_cblock));
246 case KRB4_ENCPWD_ACK:
248 * Receive ack, if mutual then send random challenge
252 * If we are doing mutual authentication, get set up to send
253 * the challenge, and verify it when the response comes back.
256 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
260 snprintf(challenge, sizeof(challenge), "%x", now);
261 Data(ap, KRB4_ENCPWD_CHALLENGE, challenge, strlen(challenge));
266 Data(ap, KRB4_ENCPWD_REJECT, 0, 0);
273 krb4encpwd_reply(ap, data, cnt)
283 char randchal[REALM_SZ], instance[ANAME_SZ], *cp;
284 char hostname[80], *realm;
289 case KRB4_ENCPWD_REJECT:
291 printf("[ KRB4_ENCPWD refuses authentication because %.*s ]\r\n",
294 printf("[ KRB4_ENCPWD refuses authentication ]\r\n");
297 case KRB4_ENCPWD_ACCEPT:
298 printf("[ KRB4_ENCPWD accepts you ]\r\n");
299 auth_finished(ap, AUTH_USER);
301 case KRB4_ENCPWD_CHALLENGE:
303 * Verify that the response to the challenge is correct.
306 gethostname(hostname, sizeof(hostname));
307 realm = krb_realmofhost(hostname);
308 memmove(challenge, data, cnt);
309 memset(user_passwd, 0, sizeof(user_passwd));
310 des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0);
311 UserPassword = user_passwd;
312 Challenge = challenge;
313 strlcpy(instance, RemoteHostName, sizeof(instance));
314 if ((cp = strchr(instance, '.')) != 0) *cp = '\0';
316 if (r = krb_mk_encpwd_req(&krb_token, KRB_SERVICE_NAME, instance, realm, Challenge, UserNameRequested, user_passwd)) {
317 krb_token.length = 0;
320 if (!Data(ap, KRB4_ENCPWD_AUTH, krb_token.dat, krb_token.length)) {
332 krb4encpwd_status(ap, name, name_sz, level)
339 if (level < AUTH_USER)
342 if (UserNameRequested && passwdok(UserNameRequested, UserPassword)) {
343 strlcpy(name, UserNameRequested, name_sz);
350 #define BUMP(buf, len) while (*(buf)) {++(buf), --(len);}
351 #define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}
354 krb4encpwd_printsub(data, cnt, buf, buflen)
355 unsigned char *data, *buf;
360 buf[buflen-1] = '\0'; /* make sure its NULL terminated */
364 case KRB4_ENCPWD_REJECT: /* Rejected (reason might follow) */
365 strlcpy((char *)buf, " REJECT ", buflen);
368 case KRB4_ENCPWD_ACCEPT: /* Accepted (name might follow) */
369 strlcpy((char *)buf, " ACCEPT ", buflen);
374 ADDC(buf, buflen, '"');
375 for (i = 4; i < cnt; i++)
376 ADDC(buf, buflen, data[i]);
377 ADDC(buf, buflen, '"');
378 ADDC(buf, buflen, '\0');
381 case KRB4_ENCPWD_AUTH: /* Authentication data follows */
382 strlcpy((char *)buf, " AUTH", buflen);
385 case KRB4_ENCPWD_CHALLENGE:
386 strlcpy((char *)buf, " CHALLENGE", buflen);
389 case KRB4_ENCPWD_ACK:
390 strlcpy((char *)buf, " ACK", buflen);
394 snprintf(buf, buflen, " %d (unknown)", data[3]);
397 for (i = 4; i < cnt; i++) {
398 snprintf(buf, buflen, " %d", data[i]);
405 int passwdok(name, passwd)
411 int passwdok_status = 0;
413 if (pwd = k_getpwnam(name))
414 salt = pwd->pw_passwd;
417 p = crypt(passwd, salt);
419 if (pwd && !strcmp(p, pwd->pw_passwd)) {
421 } else passwdok_status = 0;
422 return(passwdok_status);
435 for (i = 0; i < 8; i++)
436 printf(" %3d", key[i]);