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 * @(#)rsaencpwd.c 8.3 (Berkeley) 5/30/95
34 * $FreeBSD: src/crypto/telnet/libtelnet/rsaencpwd.c,v 1.1.1.1.8.1 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 <arpa/telnet.h>
83 extern auth_debug_mode;
85 static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
86 AUTHTYPE_RSA_ENCPWD, };
87 static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
90 #define RSA_ENCPWD_AUTH 0 /* Authentication data follows */
91 #define RSA_ENCPWD_REJECT 1 /* Rejected (reason might follow) */
92 #define RSA_ENCPWD_ACCEPT 2 /* Accepted */
93 #define RSA_ENCPWD_CHALLENGEKEY 3 /* Challenge and public key */
100 static char name[NAME_SZ];
101 static char user_passwd[PWD_SZ];
102 static char key_file[2*NAME_SZ];
103 static char lhostname[NAME_SZ];
104 static char challenge[CHAL_SZ];
105 static int challenge_len;
114 unsigned char *p = str_data + 4;
115 unsigned char *cd = (unsigned char *)d;
118 c = strlen((char *)cd);
121 printf("%s:%d: [%d] (%d)",
122 str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
130 if (type != NULL) *p++ = type;
132 if ((*p++ = *cd++) == IAC)
137 if (str_data[3] == TELQUAL_IS)
138 printsub('>', &str_data[2], p - (&str_data[2]));
139 return(net_write(str_data, p - str_data));
143 rsaencpwd_init(ap, server)
151 str_data[3] = TELQUAL_REPLY;
152 memset(key_file, 0, sizeof(key_file));
153 gethostname(lhostname, sizeof(lhostname));
154 if ((cp = strchr(lhostname, '.')) != NULL) *cp = '\0';
155 strcpy(key_file, "/etc/.");
156 strcat(key_file, lhostname);
157 strcat(key_file, "_privkey");
158 if ((fp=fopen(key_file, "r"))==NULL) return(0);
161 str_data[3] = TELQUAL_IS;
171 printf("[ Trying RSAENCPWD ... ]\n");
172 if (!UserNameRequested) {
175 if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
178 if (!Data(ap, NULL, (void *)NULL, 0)) {
187 rsaencpwd_is(ap, data, cnt)
194 char r_passwd[PWD_SZ], r_user[NAME_SZ];
196 char chalkey[160], *ptr;
198 int r, i, j, chalkey_len, len;
203 case RSA_ENCPWD_AUTH:
204 memmove((void *)auth.dat, (void *)data, auth.length = cnt);
206 if ((fp=fopen(key_file, "r"))==NULL) {
207 Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
208 auth_finished(ap, AUTH_REJECT);
214 fscanf(fp, "%x;", &len);
215 for (i=0;i<len;i++) {
216 j = getc(fp); key[i]=j;
220 r = accept_rsa_encpwd(&auth, key, challenge,
221 challenge_len, r_passwd);
223 Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
224 auth_finished(ap, AUTH_REJECT);
227 auth_encrypt_userpwd(r_passwd);
228 if (rsaencpwd_passwdok(UserNameRequested, UserPassword) == 0) {
230 * illegal username and password
232 Data(ap, RSA_ENCPWD_REJECT, (void *)"Illegal password", -1);
233 auth_finished(ap, AUTH_REJECT);
237 Data(ap, RSA_ENCPWD_ACCEPT, (void *)0, 0);
238 auth_finished(ap, AUTH_USER);
245 * If we are doing mutual authentication, get set up to send
246 * the challenge, and verify it when the response comes back.
248 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_ONE_WAY) {
253 if ((now % 2) == 0) {
254 sprintf(challenge, "%x", now);
255 challenge_len = strlen(challenge);
257 strcpy(challenge, "randchal");
261 if ((fp=fopen(key_file, "r"))==NULL) {
262 Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
263 auth_finished(ap, AUTH_REJECT);
269 fscanf(fp, "%x;", &len);
270 for (i=0;i<len;i++) {
276 fscanf(fp, "%x;", &len);
277 for (i=0;i<len;i++) {
278 j = getc(fp); key[i]=j;
282 ptr = (char *) &chalkey[1];
283 chalkey_len = 1+NumEncodeLengthOctets(i)+i+1+NumEncodeLengthOctets(challenge_len)+challenge_len;
284 EncodeLength(ptr, chalkey_len);
285 ptr +=NumEncodeLengthOctets(chalkey_len);
286 *ptr++ = 0x04; /* OCTET STRING */
287 *ptr++ = challenge_len;
288 memmove(ptr, challenge, challenge_len);
289 ptr += challenge_len;
290 *ptr++ = 0x04; /* OCTET STRING */
291 EncodeLength(ptr, i);
292 ptr += NumEncodeLengthOctets(i);
293 memmove(ptr, key, i);
294 chalkey_len = 1+NumEncodeLengthOctets(chalkey_len)+chalkey_len;
295 Data(ap, RSA_ENCPWD_CHALLENGEKEY, (void *)chalkey, chalkey_len);
300 Data(ap, RSA_ENCPWD_REJECT, 0, 0);
307 rsaencpwd_reply(ap, data, cnt)
316 char randchal[CHAL_SZ], *cp;
317 char chalkey[160], pubkey[128], *ptr;
322 case RSA_ENCPWD_REJECT:
324 printf("[ RSA_ENCPWD refuses authentication because %.*s ]\r\n",
327 printf("[ RSA_ENCPWD refuses authentication ]\r\n");
330 case RSA_ENCPWD_ACCEPT:
331 printf("[ RSA_ENCPWD accepts you ]\n");
332 auth_finished(ap, AUTH_USER);
334 case RSA_ENCPWD_CHALLENGEKEY:
336 * Verify that the response to the challenge is correct.
339 memmove((void *)chalkey, (void *)data, cnt);
340 ptr = (char *) &chalkey[0];
341 ptr += DecodeHeaderLength(chalkey);
346 challenge_len = DecodeValueLength(ptr);
347 ptr += NumEncodeLengthOctets(challenge_len);
348 memmove(challenge, ptr, challenge_len);
349 ptr += challenge_len;
354 pubkey_len = DecodeValueLength(ptr);
355 ptr += NumEncodeLengthOctets(pubkey_len);
356 memmove(pubkey, ptr, pubkey_len);
357 memset(user_passwd, 0, sizeof(user_passwd));
358 local_des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0);
359 UserPassword = user_passwd;
360 Challenge = challenge;
361 r = init_rsa_encpwd(&token, user_passwd, challenge, challenge_len, pubkey);
366 if (!Data(ap, RSA_ENCPWD_AUTH, (void *)token.dat, token.length)) {
378 rsaencpwd_status(ap, name, level)
384 if (level < AUTH_USER)
387 if (UserNameRequested && rsaencpwd_passwdok(UserNameRequested, UserPassword)) {
388 strcpy(name, UserNameRequested);
395 #define BUMP(buf, len) while (*(buf)) {++(buf), --(len);}
396 #define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}
399 rsaencpwd_printsub(data, cnt, buf, buflen)
400 unsigned char *data, *buf;
406 buf[buflen-1] = '\0'; /* make sure its NULL terminated */
410 case RSA_ENCPWD_REJECT: /* Rejected (reason might follow) */
411 strncpy((char *)buf, " REJECT ", buflen);
414 case RSA_ENCPWD_ACCEPT: /* Accepted (name might follow) */
415 strncpy((char *)buf, " ACCEPT ", buflen);
420 ADDC(buf, buflen, '"');
421 for (i = 4; i < cnt; i++)
422 ADDC(buf, buflen, data[i]);
423 ADDC(buf, buflen, '"');
424 ADDC(buf, buflen, '\0');
427 case RSA_ENCPWD_AUTH: /* Authentication data follows */
428 strncpy((char *)buf, " AUTH", buflen);
431 case RSA_ENCPWD_CHALLENGEKEY:
432 strncpy((char *)buf, " CHALLENGEKEY", buflen);
436 sprintf(lbuf, " %d (unknown)", data[3]);
437 strncpy((char *)buf, lbuf, buflen);
440 for (i = 4; i < cnt; i++) {
441 sprintf(lbuf, " %d", data[i]);
442 strncpy((char *)buf, lbuf, buflen);
449 int rsaencpwd_passwdok(name, passwd)
455 int passwdok_status = 0;
457 if (pwd = getpwnam(name))
458 salt = pwd->pw_passwd;
461 p = crypt(passwd, salt);
463 if (pwd && !strcmp(p, pwd->pw_passwd)) {
465 } else passwdok_status = 0;
466 return(passwdok_status);