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
34 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
39 static char sccsid[] = "@(#)rsaencpwd.c 8.3 (Berkeley) 5/30/95";
45 * COPYRIGHT (C) 1990 DIGITAL EQUIPMENT CORPORATION
48 * "Digital Equipment Corporation authorizes the reproduction,
49 * distribution and modification of this software subject to the following
52 * 1. Any partial or whole copy of this software, or any modification
53 * thereof, must include this copyright notice in its entirety.
55 * 2. This software is supplied "as is" with no warranty of any kind,
56 * expressed or implied, for any purpose, including any warranty of fitness
57 * or merchantibility. DIGITAL assumes no responsibility for the use or
58 * reliability of this software, nor promises to provide any form of
59 * support for it on any basis.
61 * 3. Distribution of this software is authorized only if no profit or
62 * remuneration of any kind is received in exchange for such distribution.
64 * 4. This software produces public key authentication certificates
65 * bearing an expiration date established by DIGITAL and RSA Data
66 * Security, Inc. It may cease to generate certificates after the expiration
67 * date. Any modification of this software that changes or defeats
68 * the expiration date or its effect is unauthorized.
70 * 5. Software that will renew or extend the expiration date of
71 * authentication certificates produced by this software may be obtained
72 * from RSA Data Security, Inc., 10 Twin Dolphin Drive, Redwood City, CA
73 * 94065, (415)595-8782, or from DIGITAL"
77 #include <sys/types.h>
78 #include <arpa/telnet.h>
89 extern auth_debug_mode;
91 static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
92 AUTHTYPE_RSA_ENCPWD, };
93 static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
96 #define RSA_ENCPWD_AUTH 0 /* Authentication data follows */
97 #define RSA_ENCPWD_REJECT 1 /* Rejected (reason might follow) */
98 #define RSA_ENCPWD_ACCEPT 2 /* Accepted */
99 #define RSA_ENCPWD_CHALLENGEKEY 3 /* Challenge and public key */
105 static KTEXT_ST auth;
106 static char name[NAME_SZ];
107 static char user_passwd[PWD_SZ];
108 static char key_file[2*NAME_SZ];
109 static char lhostname[NAME_SZ];
110 static char challenge[CHAL_SZ];
111 static int challenge_len;
120 unsigned char *p = str_data + 4;
121 unsigned char *cd = (unsigned char *)d;
124 c = strlen((char *)cd);
127 printf("%s:%d: [%d] (%d)",
128 str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
136 if (type != NULL) *p++ = type;
138 if ((*p++ = *cd++) == IAC)
143 if (str_data[3] == TELQUAL_IS)
144 printsub('>', &str_data[2], p - (&str_data[2]));
145 return(net_write(str_data, p - str_data));
149 rsaencpwd_init(ap, server)
157 str_data[3] = TELQUAL_REPLY;
158 memset(key_file, 0, sizeof(key_file));
159 gethostname(lhostname, sizeof(lhostname));
160 if ((cp = strchr(lhostname, '.')) != 0) *cp = '\0';
161 strcpy(key_file, "/etc/.");
162 strcat(key_file, lhostname);
163 strcat(key_file, "_privkey");
164 if ((fp=fopen(key_file, "r"))==NULL) return(0);
167 str_data[3] = TELQUAL_IS;
177 printf("[ Trying RSAENCPWD ... ]\n");
178 if (!UserNameRequested) {
181 if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
184 if (!Data(ap, NULL, (void *)NULL, 0)) {
193 rsaencpwd_is(ap, data, cnt)
200 char r_passwd[PWD_SZ], r_user[NAME_SZ];
202 char chalkey[160], *ptr;
204 int r, i, j, chalkey_len, len;
209 case RSA_ENCPWD_AUTH:
210 memmove((void *)auth.dat, (void *)data, auth.length = cnt);
212 if ((fp=fopen(key_file, "r"))==NULL) {
213 Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
214 auth_finished(ap, AUTH_REJECT);
220 fscanf(fp, "%x;", &len);
221 for (i=0;i<len;i++) {
222 j = getc(fp); key[i]=j;
226 r = accept_rsa_encpwd(&auth, key, challenge,
227 challenge_len, r_passwd);
229 Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
230 auth_finished(ap, AUTH_REJECT);
233 auth_encrypt_userpwd(r_passwd);
234 if (rsaencpwd_passwdok(UserNameRequested, UserPassword) == 0) {
236 * illegal username and password
238 Data(ap, RSA_ENCPWD_REJECT, (void *)"Illegal password", -1);
239 auth_finished(ap, AUTH_REJECT);
243 Data(ap, RSA_ENCPWD_ACCEPT, (void *)0, 0);
244 auth_finished(ap, AUTH_USER);
251 * If we are doing mutual authentication, get set up to send
252 * the challenge, and verify it when the response comes back.
254 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_ONE_WAY) {
259 if ((now % 2) == 0) {
260 sprintf(challenge, "%x", now);
261 challenge_len = strlen(challenge);
263 strcpy(challenge, "randchal");
267 if ((fp=fopen(key_file, "r"))==NULL) {
268 Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
269 auth_finished(ap, AUTH_REJECT);
275 fscanf(fp, "%x;", &len);
276 for (i=0;i<len;i++) {
282 fscanf(fp, "%x;", &len);
283 for (i=0;i<len;i++) {
284 j = getc(fp); key[i]=j;
288 ptr = (char *) &chalkey[1];
289 chalkey_len = 1+NumEncodeLengthOctets(i)+i+1+NumEncodeLengthOctets(challenge_len)+challenge_len;
290 EncodeLength(ptr, chalkey_len);
291 ptr +=NumEncodeLengthOctets(chalkey_len);
292 *ptr++ = 0x04; /* OCTET STRING */
293 *ptr++ = challenge_len;
294 memmove(ptr, challenge, challenge_len);
295 ptr += challenge_len;
296 *ptr++ = 0x04; /* OCTET STRING */
297 EncodeLength(ptr, i);
298 ptr += NumEncodeLengthOctets(i);
299 memmove(ptr, key, i);
300 chalkey_len = 1+NumEncodeLengthOctets(chalkey_len)+chalkey_len;
301 Data(ap, RSA_ENCPWD_CHALLENGEKEY, (void *)chalkey, chalkey_len);
306 Data(ap, RSA_ENCPWD_REJECT, 0, 0);
313 rsaencpwd_reply(ap, data, cnt)
322 char randchal[CHAL_SZ], *cp;
323 char chalkey[160], pubkey[128], *ptr;
328 case RSA_ENCPWD_REJECT:
330 printf("[ RSA_ENCPWD refuses authentication because %.*s ]\r\n",
333 printf("[ RSA_ENCPWD refuses authentication ]\r\n");
336 case RSA_ENCPWD_ACCEPT:
337 printf("[ RSA_ENCPWD accepts you ]\n");
338 auth_finished(ap, AUTH_USER);
340 case RSA_ENCPWD_CHALLENGEKEY:
342 * Verify that the response to the challenge is correct.
345 memmove((void *)chalkey, (void *)data, cnt);
346 ptr = (char *) &chalkey[0];
347 ptr += DecodeHeaderLength(chalkey);
352 challenge_len = DecodeValueLength(ptr);
353 ptr += NumEncodeLengthOctets(challenge_len);
354 memmove(challenge, ptr, challenge_len);
355 ptr += challenge_len;
360 pubkey_len = DecodeValueLength(ptr);
361 ptr += NumEncodeLengthOctets(pubkey_len);
362 memmove(pubkey, ptr, pubkey_len);
363 memset(user_passwd, 0, sizeof(user_passwd));
364 local_des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0);
365 UserPassword = user_passwd;
366 Challenge = challenge;
367 r = init_rsa_encpwd(&token, user_passwd, challenge, challenge_len, pubkey);
372 if (!Data(ap, RSA_ENCPWD_AUTH, (void *)token.dat, token.length)) {
384 rsaencpwd_status(ap, name, level)
390 if (level < AUTH_USER)
393 if (UserNameRequested && rsaencpwd_passwdok(UserNameRequested, UserPassword)) {
394 strcpy(name, UserNameRequested);
401 #define BUMP(buf, len) while (*(buf)) {++(buf), --(len);}
402 #define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}
405 rsaencpwd_printsub(data, cnt, buf, buflen)
406 unsigned char *data, *buf;
412 buf[buflen-1] = '\0'; /* make sure its NULL terminated */
416 case RSA_ENCPWD_REJECT: /* Rejected (reason might follow) */
417 strncpy((char *)buf, " REJECT ", buflen);
420 case RSA_ENCPWD_ACCEPT: /* Accepted (name might follow) */
421 strncpy((char *)buf, " ACCEPT ", buflen);
426 ADDC(buf, buflen, '"');
427 for (i = 4; i < cnt; i++)
428 ADDC(buf, buflen, data[i]);
429 ADDC(buf, buflen, '"');
430 ADDC(buf, buflen, '\0');
433 case RSA_ENCPWD_AUTH: /* Authentication data follows */
434 strncpy((char *)buf, " AUTH", buflen);
437 case RSA_ENCPWD_CHALLENGEKEY:
438 strncpy((char *)buf, " CHALLENGEKEY", buflen);
442 sprintf(lbuf, " %d (unknown)", data[3]);
443 strncpy((char *)buf, lbuf, buflen);
446 for (i = 4; i < cnt; i++) {
447 sprintf(lbuf, " %d", data[i]);
448 strncpy((char *)buf, lbuf, buflen);
455 int rsaencpwd_passwdok(name, passwd)
461 int passwdok_status = 0;
463 if (pwd = getpwnam(name))
464 salt = pwd->pw_passwd;
467 p = crypt(passwd, salt);
469 if (pwd && !strcmp(p, pwd->pw_passwd)) {
471 } else passwdok_status = 0;
472 return(passwdok_status);