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 $
35 * $DragonFly: src/crypto/telnet/libtelnet/rsaencpwd.c,v 1.2 2003/06/17 04:24:37 dillon Exp $
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>
84 extern auth_debug_mode;
86 static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
87 AUTHTYPE_RSA_ENCPWD, };
88 static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
91 #define RSA_ENCPWD_AUTH 0 /* Authentication data follows */
92 #define RSA_ENCPWD_REJECT 1 /* Rejected (reason might follow) */
93 #define RSA_ENCPWD_ACCEPT 2 /* Accepted */
94 #define RSA_ENCPWD_CHALLENGEKEY 3 /* Challenge and public key */
100 static KTEXT_ST auth;
101 static char name[NAME_SZ];
102 static char user_passwd[PWD_SZ];
103 static char key_file[2*NAME_SZ];
104 static char lhostname[NAME_SZ];
105 static char challenge[CHAL_SZ];
106 static int challenge_len;
115 unsigned char *p = str_data + 4;
116 unsigned char *cd = (unsigned char *)d;
119 c = strlen((char *)cd);
122 printf("%s:%d: [%d] (%d)",
123 str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
131 if (type != NULL) *p++ = type;
133 if ((*p++ = *cd++) == IAC)
138 if (str_data[3] == TELQUAL_IS)
139 printsub('>', &str_data[2], p - (&str_data[2]));
140 return(net_write(str_data, p - str_data));
144 rsaencpwd_init(ap, server)
152 str_data[3] = TELQUAL_REPLY;
153 memset(key_file, 0, sizeof(key_file));
154 gethostname(lhostname, sizeof(lhostname));
155 if ((cp = strchr(lhostname, '.')) != 0) *cp = '\0';
156 strcpy(key_file, "/etc/.");
157 strcat(key_file, lhostname);
158 strcat(key_file, "_privkey");
159 if ((fp=fopen(key_file, "r"))==NULL) return(0);
162 str_data[3] = TELQUAL_IS;
172 printf("[ Trying RSAENCPWD ... ]\n");
173 if (!UserNameRequested) {
176 if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
179 if (!Data(ap, NULL, (void *)NULL, 0)) {
188 rsaencpwd_is(ap, data, cnt)
195 char r_passwd[PWD_SZ], r_user[NAME_SZ];
197 char chalkey[160], *ptr;
199 int r, i, j, chalkey_len, len;
204 case RSA_ENCPWD_AUTH:
205 memmove((void *)auth.dat, (void *)data, auth.length = cnt);
207 if ((fp=fopen(key_file, "r"))==NULL) {
208 Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
209 auth_finished(ap, AUTH_REJECT);
215 fscanf(fp, "%x;", &len);
216 for (i=0;i<len;i++) {
217 j = getc(fp); key[i]=j;
221 r = accept_rsa_encpwd(&auth, key, challenge,
222 challenge_len, r_passwd);
224 Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
225 auth_finished(ap, AUTH_REJECT);
228 auth_encrypt_userpwd(r_passwd);
229 if (rsaencpwd_passwdok(UserNameRequested, UserPassword) == 0) {
231 * illegal username and password
233 Data(ap, RSA_ENCPWD_REJECT, (void *)"Illegal password", -1);
234 auth_finished(ap, AUTH_REJECT);
238 Data(ap, RSA_ENCPWD_ACCEPT, (void *)0, 0);
239 auth_finished(ap, AUTH_USER);
246 * If we are doing mutual authentication, get set up to send
247 * the challenge, and verify it when the response comes back.
249 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_ONE_WAY) {
254 if ((now % 2) == 0) {
255 sprintf(challenge, "%x", now);
256 challenge_len = strlen(challenge);
258 strcpy(challenge, "randchal");
262 if ((fp=fopen(key_file, "r"))==NULL) {
263 Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
264 auth_finished(ap, AUTH_REJECT);
270 fscanf(fp, "%x;", &len);
271 for (i=0;i<len;i++) {
277 fscanf(fp, "%x;", &len);
278 for (i=0;i<len;i++) {
279 j = getc(fp); key[i]=j;
283 ptr = (char *) &chalkey[1];
284 chalkey_len = 1+NumEncodeLengthOctets(i)+i+1+NumEncodeLengthOctets(challenge_len)+challenge_len;
285 EncodeLength(ptr, chalkey_len);
286 ptr +=NumEncodeLengthOctets(chalkey_len);
287 *ptr++ = 0x04; /* OCTET STRING */
288 *ptr++ = challenge_len;
289 memmove(ptr, challenge, challenge_len);
290 ptr += challenge_len;
291 *ptr++ = 0x04; /* OCTET STRING */
292 EncodeLength(ptr, i);
293 ptr += NumEncodeLengthOctets(i);
294 memmove(ptr, key, i);
295 chalkey_len = 1+NumEncodeLengthOctets(chalkey_len)+chalkey_len;
296 Data(ap, RSA_ENCPWD_CHALLENGEKEY, (void *)chalkey, chalkey_len);
301 Data(ap, RSA_ENCPWD_REJECT, 0, 0);
308 rsaencpwd_reply(ap, data, cnt)
317 char randchal[CHAL_SZ], *cp;
318 char chalkey[160], pubkey[128], *ptr;
323 case RSA_ENCPWD_REJECT:
325 printf("[ RSA_ENCPWD refuses authentication because %.*s ]\r\n",
328 printf("[ RSA_ENCPWD refuses authentication ]\r\n");
331 case RSA_ENCPWD_ACCEPT:
332 printf("[ RSA_ENCPWD accepts you ]\n");
333 auth_finished(ap, AUTH_USER);
335 case RSA_ENCPWD_CHALLENGEKEY:
337 * Verify that the response to the challenge is correct.
340 memmove((void *)chalkey, (void *)data, cnt);
341 ptr = (char *) &chalkey[0];
342 ptr += DecodeHeaderLength(chalkey);
347 challenge_len = DecodeValueLength(ptr);
348 ptr += NumEncodeLengthOctets(challenge_len);
349 memmove(challenge, ptr, challenge_len);
350 ptr += challenge_len;
355 pubkey_len = DecodeValueLength(ptr);
356 ptr += NumEncodeLengthOctets(pubkey_len);
357 memmove(pubkey, ptr, pubkey_len);
358 memset(user_passwd, 0, sizeof(user_passwd));
359 local_des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0);
360 UserPassword = user_passwd;
361 Challenge = challenge;
362 r = init_rsa_encpwd(&token, user_passwd, challenge, challenge_len, pubkey);
367 if (!Data(ap, RSA_ENCPWD_AUTH, (void *)token.dat, token.length)) {
379 rsaencpwd_status(ap, name, level)
385 if (level < AUTH_USER)
388 if (UserNameRequested && rsaencpwd_passwdok(UserNameRequested, UserPassword)) {
389 strcpy(name, UserNameRequested);
396 #define BUMP(buf, len) while (*(buf)) {++(buf), --(len);}
397 #define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}
400 rsaencpwd_printsub(data, cnt, buf, buflen)
401 unsigned char *data, *buf;
407 buf[buflen-1] = '\0'; /* make sure its NULL terminated */
411 case RSA_ENCPWD_REJECT: /* Rejected (reason might follow) */
412 strncpy((char *)buf, " REJECT ", buflen);
415 case RSA_ENCPWD_ACCEPT: /* Accepted (name might follow) */
416 strncpy((char *)buf, " ACCEPT ", buflen);
421 ADDC(buf, buflen, '"');
422 for (i = 4; i < cnt; i++)
423 ADDC(buf, buflen, data[i]);
424 ADDC(buf, buflen, '"');
425 ADDC(buf, buflen, '\0');
428 case RSA_ENCPWD_AUTH: /* Authentication data follows */
429 strncpy((char *)buf, " AUTH", buflen);
432 case RSA_ENCPWD_CHALLENGEKEY:
433 strncpy((char *)buf, " CHALLENGEKEY", buflen);
437 sprintf(lbuf, " %d (unknown)", data[3]);
438 strncpy((char *)buf, lbuf, buflen);
441 for (i = 4; i < cnt; i++) {
442 sprintf(lbuf, " %d", data[i]);
443 strncpy((char *)buf, lbuf, buflen);
450 int rsaencpwd_passwdok(name, passwd)
456 int passwdok_status = 0;
458 if (pwd = getpwnam(name))
459 salt = pwd->pw_passwd;
462 p = crypt(passwd, salt);
464 if (pwd && !strcmp(p, pwd->pw_passwd)) {
466 } else passwdok_status = 0;
467 return(passwdok_status);