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
36 RCSID("$Id: krb4encpwd.c 22071 2007-11-14 20:04:50Z lha $");
40 * COPYRIGHT (C) 1990 DIGITAL EQUIPMENT CORPORATION
43 * "Digital Equipment Corporation authorizes the reproduction,
44 * distribution and modification of this software subject to the following
47 * 1. Any partial or whole copy of this software, or any modification
48 * thereof, must include this copyright notice in its entirety.
50 * 2. This software is supplied "as is" with no warranty of any kind,
51 * expressed or implied, for any purpose, including any warranty of fitness
52 * or merchantibility. DIGITAL assumes no responsibility for the use or
53 * reliability of this software, nor promises to provide any form of
54 * support for it on any basis.
56 * 3. Distribution of this software is authorized only if no profit or
57 * remuneration of any kind is received in exchange for such distribution.
59 * 4. This software produces public key authentication certificates
60 * bearing an expiration date established by DIGITAL and RSA Data
61 * Security, Inc. It may cease to generate certificates after the expiration
62 * date. Any modification of this software that changes or defeats
63 * the expiration date or its effect is unauthorized.
65 * 5. Software that will renew or extend the expiration date of
66 * authentication certificates produced by this software may be obtained
67 * from RSA Data Security, Inc., 10 Twin Dolphin Drive, Redwood City, CA
68 * 94065, (415)595-8782, or from DIGITAL"
72 #include <sys/types.h>
73 #include <arpa/telnet.h>
88 int krb_mk_encpwd_req (KTEXT, char *, char *, char *, char *, char *, char *);
89 int krb_rd_encpwd_req (KTEXT, char *, char *, u_long, AUTH_DAT *, char *, char *, char *, char *);
91 extern auth_debug_mode;
93 static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
94 AUTHTYPE_KRB4_ENCPWD, };
95 static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
98 #define KRB4_ENCPWD_AUTH 0 /* Authentication data follows */
99 #define KRB4_ENCPWD_REJECT 1 /* Rejected (reason might follow) */
100 #define KRB4_ENCPWD_ACCEPT 2 /* Accepted */
101 #define KRB4_ENCPWD_CHALLENGE 3 /* Challenge for mutual auth. */
102 #define KRB4_ENCPWD_ACK 4 /* Acknowledge */
104 #define KRB_SERVICE_NAME "rcmd"
106 static KTEXT_ST auth;
107 static char name[ANAME_SZ];
108 static char user_passwd[ANAME_SZ];
109 static AUTH_DAT adat = { 0 };
110 static des_key_schedule sched;
111 static char challenge[REALM_SZ];
120 unsigned char *p = str_data + 4;
121 unsigned char *cd = (unsigned char *)d;
127 printf("%s:%d: [%d] (%d)",
128 str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
138 if ((*p++ = *cd++) == IAC)
143 if (str_data[3] == TELQUAL_IS)
144 printsub('>', &str_data[2], p - (&str_data[2]));
145 return(telnet_net_write(str_data, p - str_data));
149 krb4encpwd_init(ap, server)
153 char hostname[80], *cp, *realm;
157 str_data[3] = TELQUAL_REPLY;
159 str_data[3] = TELQUAL_IS;
160 gethostname(hostname, sizeof(hostname));
161 realm = krb_realmofhost(hostname);
162 cp = strchr(hostname, '.');
163 if (*cp != NULL) *cp = NULL;
164 if (read_service_key(KRB_SERVICE_NAME, hostname, realm, 0,
165 KEYFILE, (char *)skey)) {
177 printf("[ Trying KRB4ENCPWD ... ]\r\n");
178 if (!UserNameRequested) {
181 if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
185 if (!Data(ap, KRB4_ENCPWD_ACK, NULL, 0)) {
193 krb4encpwd_is(ap, data, cnt)
199 des_cblock datablock;
200 char r_passwd[ANAME_SZ], r_user[ANAME_SZ];
201 char lhostname[ANAME_SZ], *cp;
208 case KRB4_ENCPWD_AUTH:
209 memmove(auth.dat, data, auth.length = cnt);
211 gethostname(lhostname, sizeof(lhostname));
212 if ((cp = strchr(lhostname, '.')) != 0) *cp = '\0';
214 if (r = krb_rd_encpwd_req(&auth, KRB_SERVICE_NAME, lhostname, 0, &adat, NULL, challenge, r_user, r_passwd)) {
215 Data(ap, KRB4_ENCPWD_REJECT, "Auth failed", -1);
216 auth_finished(ap, AUTH_REJECT);
219 auth_encrypt_userpwd(r_passwd);
220 if (passwdok(UserNameRequested, UserPassword) == 0) {
222 * illegal username and password
224 Data(ap, KRB4_ENCPWD_REJECT, "Illegal password", -1);
225 auth_finished(ap, AUTH_REJECT);
229 memmove(session_key, adat.session, sizeof(des_cblock));
230 Data(ap, KRB4_ENCPWD_ACCEPT, 0, 0);
231 auth_finished(ap, AUTH_USER);
234 case KRB4_ENCPWD_CHALLENGE:
236 * Take the received random challenge text and save
237 * for future authentication.
239 memmove(challenge, data, sizeof(des_cblock));
243 case KRB4_ENCPWD_ACK:
245 * Receive ack, if mutual then send random challenge
249 * If we are doing mutual authentication, get set up to send
250 * the challenge, and verify it when the response comes back.
253 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
257 snprintf(challenge, sizeof(challenge), "%x", now);
258 Data(ap, KRB4_ENCPWD_CHALLENGE, challenge, strlen(challenge));
263 Data(ap, KRB4_ENCPWD_REJECT, 0, 0);
270 krb4encpwd_reply(ap, data, cnt)
280 char randchal[REALM_SZ], instance[ANAME_SZ], *cp;
281 char hostname[80], *realm;
286 case KRB4_ENCPWD_REJECT:
288 printf("[ KRB4_ENCPWD refuses authentication because %.*s ]\r\n",
291 printf("[ KRB4_ENCPWD refuses authentication ]\r\n");
294 case KRB4_ENCPWD_ACCEPT:
295 printf("[ KRB4_ENCPWD accepts you ]\r\n");
296 auth_finished(ap, AUTH_USER);
298 case KRB4_ENCPWD_CHALLENGE:
300 * Verify that the response to the challenge is correct.
303 gethostname(hostname, sizeof(hostname));
304 realm = krb_realmofhost(hostname);
305 memmove(challenge, data, cnt);
306 memset(user_passwd, 0, sizeof(user_passwd));
307 des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0);
308 UserPassword = user_passwd;
309 Challenge = challenge;
310 strlcpy(instance, RemoteHostName, sizeof(instance));
311 if ((cp = strchr(instance, '.')) != 0) *cp = '\0';
313 if (r = krb_mk_encpwd_req(&krb_token, KRB_SERVICE_NAME, instance, realm, Challenge, UserNameRequested, user_passwd)) {
314 krb_token.length = 0;
317 if (!Data(ap, KRB4_ENCPWD_AUTH, krb_token.dat, krb_token.length)) {
329 krb4encpwd_status(ap, name, name_sz, level)
336 if (level < AUTH_USER)
339 if (UserNameRequested && passwdok(UserNameRequested, UserPassword)) {
340 strlcpy(name, UserNameRequested, name_sz);
347 #define BUMP(buf, len) while (*(buf)) {++(buf), --(len);}
348 #define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}
351 krb4encpwd_printsub(data, cnt, buf, buflen)
352 unsigned char *data, *buf;
357 buf[buflen-1] = '\0'; /* make sure it's NULL terminated */
361 case KRB4_ENCPWD_REJECT: /* Rejected (reason might follow) */
362 strlcpy((char *)buf, " REJECT ", buflen);
365 case KRB4_ENCPWD_ACCEPT: /* Accepted (name might follow) */
366 strlcpy((char *)buf, " ACCEPT ", buflen);
371 ADDC(buf, buflen, '"');
372 for (i = 4; i < cnt; i++)
373 ADDC(buf, buflen, data[i]);
374 ADDC(buf, buflen, '"');
375 ADDC(buf, buflen, '\0');
378 case KRB4_ENCPWD_AUTH: /* Authentication data follows */
379 strlcpy((char *)buf, " AUTH", buflen);
382 case KRB4_ENCPWD_CHALLENGE:
383 strlcpy((char *)buf, " CHALLENGE", buflen);
386 case KRB4_ENCPWD_ACK:
387 strlcpy((char *)buf, " ACK", buflen);
391 snprintf(buf, buflen, " %d (unknown)", data[3]);
394 for (i = 4; i < cnt; i++) {
395 snprintf(buf, buflen, " %d", data[i]);
402 int passwdok(name, passwd)
408 int passwdok_status = 0;
410 if (pwd = k_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);
432 for (i = 0; i < 8; i++)
433 printf(" %3d", key[i]);