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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
35 static char sccsid[] = "@(#)rsaencpwd.c 8.3 (Berkeley) 5/30/95";
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>
85 extern auth_debug_mode;
87 static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
88 AUTHTYPE_RSA_ENCPWD, };
89 static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
92 #define RSA_ENCPWD_AUTH 0 /* Authentication data follows */
93 #define RSA_ENCPWD_REJECT 1 /* Rejected (reason might follow) */
94 #define RSA_ENCPWD_ACCEPT 2 /* Accepted */
95 #define RSA_ENCPWD_CHALLENGEKEY 3 /* Challenge and public key */
101 static KTEXT_ST auth;
102 static char name[NAME_SZ];
103 static char user_passwd[PWD_SZ];
104 static char key_file[2*NAME_SZ];
105 static char lhostname[NAME_SZ];
106 static char challenge[CHAL_SZ];
107 static int challenge_len;
116 unsigned char *p = str_data + 4;
117 unsigned char *cd = (unsigned char *)d;
120 c = strlen((char *)cd);
123 printf("%s:%d: [%d] (%d)",
124 str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
132 if (type != NULL) *p++ = type;
134 if ((*p++ = *cd++) == IAC)
139 if (str_data[3] == TELQUAL_IS)
140 printsub('>', &str_data[2], p - (&str_data[2]));
141 return(net_write(str_data, p - str_data));
145 rsaencpwd_init(ap, server)
153 str_data[3] = TELQUAL_REPLY;
154 memset(key_file, 0, sizeof(key_file));
155 gethostname(lhostname, sizeof(lhostname));
156 if ((cp = strchr(lhostname, '.')) != 0) *cp = '\0';
157 strcpy(key_file, "/etc/.");
158 strcat(key_file, lhostname);
159 strcat(key_file, "_privkey");
160 if ((fp=fopen(key_file, "r"))==NULL) return(0);
163 str_data[3] = TELQUAL_IS;
173 printf("[ Trying RSAENCPWD ... ]\n");
174 if (!UserNameRequested) {
177 if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
180 if (!Data(ap, NULL, (void *)NULL, 0)) {
189 rsaencpwd_is(ap, data, cnt)
196 char r_passwd[PWD_SZ], r_user[NAME_SZ];
198 char chalkey[160], *ptr;
200 int r, i, j, chalkey_len, len;
205 case RSA_ENCPWD_AUTH:
206 memmove((void *)auth.dat, (void *)data, auth.length = cnt);
208 if ((fp=fopen(key_file, "r"))==NULL) {
209 Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
210 auth_finished(ap, AUTH_REJECT);
216 fscanf(fp, "%x;", &len);
217 for (i=0;i<len;i++) {
218 j = getc(fp); key[i]=j;
222 r = accept_rsa_encpwd(&auth, key, challenge,
223 challenge_len, r_passwd);
225 Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
226 auth_finished(ap, AUTH_REJECT);
229 auth_encrypt_userpwd(r_passwd);
230 if (rsaencpwd_passwdok(UserNameRequested, UserPassword) == 0) {
232 * illegal username and password
234 Data(ap, RSA_ENCPWD_REJECT, (void *)"Illegal password", -1);
235 auth_finished(ap, AUTH_REJECT);
239 Data(ap, RSA_ENCPWD_ACCEPT, (void *)0, 0);
240 auth_finished(ap, AUTH_USER);
247 * If we are doing mutual authentication, get set up to send
248 * the challenge, and verify it when the response comes back.
250 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_ONE_WAY) {
255 if ((now % 2) == 0) {
256 sprintf(challenge, "%x", now);
257 challenge_len = strlen(challenge);
259 strcpy(challenge, "randchal");
263 if ((fp=fopen(key_file, "r"))==NULL) {
264 Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
265 auth_finished(ap, AUTH_REJECT);
271 fscanf(fp, "%x;", &len);
272 for (i=0;i<len;i++) {
278 fscanf(fp, "%x;", &len);
279 for (i=0;i<len;i++) {
280 j = getc(fp); key[i]=j;
284 ptr = (char *) &chalkey[1];
285 chalkey_len = 1+NumEncodeLengthOctets(i)+i+1+NumEncodeLengthOctets(challenge_len)+challenge_len;
286 EncodeLength(ptr, chalkey_len);
287 ptr +=NumEncodeLengthOctets(chalkey_len);
288 *ptr++ = 0x04; /* OCTET STRING */
289 *ptr++ = challenge_len;
290 memmove(ptr, challenge, challenge_len);
291 ptr += challenge_len;
292 *ptr++ = 0x04; /* OCTET STRING */
293 EncodeLength(ptr, i);
294 ptr += NumEncodeLengthOctets(i);
295 memmove(ptr, key, i);
296 chalkey_len = 1+NumEncodeLengthOctets(chalkey_len)+chalkey_len;
297 Data(ap, RSA_ENCPWD_CHALLENGEKEY, (void *)chalkey, chalkey_len);
302 Data(ap, RSA_ENCPWD_REJECT, 0, 0);
309 rsaencpwd_reply(ap, data, cnt)
318 char randchal[CHAL_SZ], *cp;
319 char chalkey[160], pubkey[128], *ptr;
324 case RSA_ENCPWD_REJECT:
326 printf("[ RSA_ENCPWD refuses authentication because %.*s ]\r\n",
329 printf("[ RSA_ENCPWD refuses authentication ]\r\n");
332 case RSA_ENCPWD_ACCEPT:
333 printf("[ RSA_ENCPWD accepts you ]\n");
334 auth_finished(ap, AUTH_USER);
336 case RSA_ENCPWD_CHALLENGEKEY:
338 * Verify that the response to the challenge is correct.
341 memmove((void *)chalkey, (void *)data, cnt);
342 ptr = (char *) &chalkey[0];
343 ptr += DecodeHeaderLength(chalkey);
348 challenge_len = DecodeValueLength(ptr);
349 ptr += NumEncodeLengthOctets(challenge_len);
350 memmove(challenge, ptr, challenge_len);
351 ptr += challenge_len;
356 pubkey_len = DecodeValueLength(ptr);
357 ptr += NumEncodeLengthOctets(pubkey_len);
358 memmove(pubkey, ptr, pubkey_len);
359 memset(user_passwd, 0, sizeof(user_passwd));
360 local_des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0);
361 UserPassword = user_passwd;
362 Challenge = challenge;
363 r = init_rsa_encpwd(&token, user_passwd, challenge, challenge_len, pubkey);
368 if (!Data(ap, RSA_ENCPWD_AUTH, (void *)token.dat, token.length)) {
380 rsaencpwd_status(ap, name, level)
386 if (level < AUTH_USER)
389 if (UserNameRequested && rsaencpwd_passwdok(UserNameRequested, UserPassword)) {
390 strcpy(name, UserNameRequested);
397 #define BUMP(buf, len) while (*(buf)) {++(buf), --(len);}
398 #define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}
401 rsaencpwd_printsub(data, cnt, buf, buflen)
402 unsigned char *data, *buf;
408 buf[buflen-1] = '\0'; /* make sure its NULL terminated */
412 case RSA_ENCPWD_REJECT: /* Rejected (reason might follow) */
413 strncpy((char *)buf, " REJECT ", buflen);
416 case RSA_ENCPWD_ACCEPT: /* Accepted (name might follow) */
417 strncpy((char *)buf, " ACCEPT ", buflen);
422 ADDC(buf, buflen, '"');
423 for (i = 4; i < cnt; i++)
424 ADDC(buf, buflen, data[i]);
425 ADDC(buf, buflen, '"');
426 ADDC(buf, buflen, '\0');
429 case RSA_ENCPWD_AUTH: /* Authentication data follows */
430 strncpy((char *)buf, " AUTH", buflen);
433 case RSA_ENCPWD_CHALLENGEKEY:
434 strncpy((char *)buf, " CHALLENGEKEY", buflen);
438 sprintf(lbuf, " %d (unknown)", data[3]);
439 strncpy((char *)buf, lbuf, buflen);
442 for (i = 4; i < cnt; i++) {
443 sprintf(lbuf, " %d", data[i]);
444 strncpy((char *)buf, lbuf, buflen);
451 int rsaencpwd_passwdok(name, passwd)
457 int passwdok_status = 0;
459 if (pwd = getpwnam(name))
460 salt = pwd->pw_passwd;
463 p = crypt(passwd, salt);
465 if (pwd && !strcmp(p, pwd->pw_passwd)) {
467 } else passwdok_status = 0;
468 return(passwdok_status);