[unix-history] / usr / src / lib / libtelnet / rsaencpwd.c

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)rsaencpwd.c	8.1 (Berkeley) 6/4/93";
#endif /* not lint */


#ifdef	RSA_ENCPWD
/*
 * COPYRIGHT (C) 1990 DIGITAL EQUIPMENT CORPORATION
 * ALL RIGHTS RESERVED
 *
 * "Digital Equipment Corporation authorizes the reproduction,
 * distribution and modification of this software subject to the following
 * restrictions:
 *
 * 1.  Any partial or whole copy of this software, or any modification
 * thereof, must include this copyright notice in its entirety.
 *
 * 2.  This software is supplied "as is" with no warranty of any kind,
 * expressed or implied, for any purpose, including any warranty of fitness
 * or merchantibility.  DIGITAL assumes no responsibility for the use or
 * reliability of this software, nor promises to provide any form of
 * support for it on any basis.
 *
 * 3.  Distribution of this software is authorized only if no profit or
 * remuneration of any kind is received in exchange for such distribution.
 *
 * 4.  This software produces public key authentication certificates
 * bearing an expiration date established by DIGITAL and RSA Data
 * Security, Inc.  It may cease to generate certificates after the expiration
 * date.  Any modification of this software that changes or defeats
 * the expiration date or its effect is unauthorized.
 *
 * 5.  Software that will renew or extend the expiration date of
 * authentication certificates produced by this software may be obtained
 * from RSA Data Security, Inc., 10 Twin Dolphin Drive, Redwood City, CA
 * 94065, (415)595-8782, or from DIGITAL"
 *
 */

#include <sys/types.h>
#include <arpa/telnet.h>
#include <pwd.h>
#include <stdio.h>

#ifdef	__STDC__
#include <stdlib.h>
#endif
#ifdef	NO_STRING_H
#include <strings.h>
#else
#include <string.h>
#endif

#include "encrypt.h"
#include "auth.h"
#include "misc.h"
#include "cdc.h"

extern auth_debug_mode;

static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
			  		AUTHTYPE_RSA_ENCPWD, };
static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
					TELQUAL_NAME, };

#define	RSA_ENCPWD_AUTH	0	/* Authentication data follows */
#define	RSA_ENCPWD_REJECT	1	/* Rejected (reason might follow) */
#define RSA_ENCPWD_ACCEPT	2	/* Accepted */
#define	RSA_ENCPWD_CHALLENGEKEY	3	/* Challenge and public key */

#define NAME_SZ   40
#define CHAL_SZ   20
#define PWD_SZ    40

static	KTEXT_ST auth;
static	char name[NAME_SZ];
static	char user_passwd[PWD_SZ];
static  char key_file[2*NAME_SZ];
static  char lhostname[NAME_SZ];
static char  challenge[CHAL_SZ];
static int   challenge_len;

	static int
Data(ap, type, d, c)
	Authenticator *ap;
	int type;
	void *d;
	int c;
{
        unsigned char *p = str_data + 4;
	unsigned char *cd = (unsigned char *)d;

	if (c == -1)
		c = strlen((char *)cd);

        if (0) {
                printf("%s:%d: [%d] (%d)",
                        str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
                        str_data[3],
                        type, c);
                printd(d, c);
                printf("\r\n");
        }
	*p++ = ap->type;
	*p++ = ap->way;
	if (type != NULL) *p++ = type;
        while (c-- > 0) {
                if ((*p++ = *cd++) == IAC)
                        *p++ = IAC;
        }
        *p++ = IAC;
        *p++ = SE;
	if (str_data[3] == TELQUAL_IS)
		printsub('>', &str_data[2], p - (&str_data[2]));
        return(net_write(str_data, p - str_data));
}

	int
rsaencpwd_init(ap, server)
	Authenticator *ap;
	int server;
{
	char  *cp;
	FILE  *fp;

	if (server) {
		str_data[3] = TELQUAL_REPLY;
		bzero(key_file, sizeof(key_file));
		gethostname(lhostname, sizeof(lhostname));
		if ((cp = index(lhostname, '.')) != 0)  *cp = '\0';
		strcpy(key_file, "/etc/.");
		strcat(key_file, lhostname);
		strcat(key_file, "_privkey");
		if ((fp=fopen(key_file, "r"))==NULL) return(0);
		fclose(fp);
	} else {
		str_data[3] = TELQUAL_IS;
	}
	return(1);
}

	int
rsaencpwd_send(ap)
	Authenticator *ap;
{

	printf("[ Trying RSAENCPWD ... ]\n");
	if (!UserNameRequested) {
		return(0);
	}
	if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
		return(0);
	}
	if (!Data(ap, NULL, (void *)NULL, 0)) {
		return(0);
	}


	return(1);
}

	void
rsaencpwd_is(ap, data, cnt)
	Authenticator *ap;
	unsigned char *data;
	int cnt;
{
	Session_Key skey;
	Block datablock;
	char  r_passwd[PWD_SZ], r_user[NAME_SZ];
	char  *cp, key[160];
	char  chalkey[160], *ptr;
	FILE  *fp;
	int r, i, j, chalkey_len, len;
	time_t now;

	cnt--;
	switch (*data++) {
	case RSA_ENCPWD_AUTH:
		bcopy((void *)data, (void *)auth.dat, auth.length = cnt);

		if ((fp=fopen(key_file, "r"))==NULL) {
		  Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
		  auth_finished(ap, AUTH_REJECT);
		  return;
		}
		/*
		 *  get privkey
		 */
		fscanf(fp, "%x;", &len);
		for (i=0;i<len;i++) {
		  j = getc(fp);  key[i]=j;
		}
		fclose(fp);

		r = accept_rsa_encpwd(&auth, key, challenge,
				      challenge_len, r_passwd);
		if (r < 0) {
		  Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
		  auth_finished(ap, AUTH_REJECT);
		  return;
		}
		auth_encrypt_userpwd(r_passwd);
		if (rsaencpwd_passwdok(UserNameRequested, UserPassword) == 0) {
		  /*
		   *  illegal username and password
		   */
		  Data(ap, RSA_ENCPWD_REJECT, (void *)"Illegal password", -1);
		  auth_finished(ap, AUTH_REJECT);
		  return;
		}

		Data(ap, RSA_ENCPWD_ACCEPT, (void *)0, 0);
		auth_finished(ap, AUTH_USER);
		break;


	case IAC:

		/*
		 * If we are doing mutual authentication, get set up to send
		 * the challange, and verify it when the response comes back.
		 */
		if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_ONE_WAY) {
		  register int i;


		  time(&now);
		  if ((now % 2) == 0) {
		    sprintf(challenge, "%x", now);
		    challenge_len = strlen(challenge);
		  } else {
		    strcpy(challenge, "randchal");
		    challenge_len = 8;
		  }

		  if ((fp=fopen(key_file, "r"))==NULL) {
		    Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
		    auth_finished(ap, AUTH_REJECT);
		    return;
		  }
		  /*
		   *  skip privkey
		   */
		  fscanf(fp, "%x;", &len);
		  for (i=0;i<len;i++) {
		    j = getc(fp);
		  }
		  /*
		   * get pubkey
		   */
		  fscanf(fp, "%x;", &len);
		  for (i=0;i<len;i++) {
		    j = getc(fp);  key[i]=j;
		  }
		  fclose(fp);
		  chalkey[0] = 0x30;
		  ptr = (char *) &chalkey[1];
		  chalkey_len = 1+NumEncodeLengthOctets(i)+i+1+NumEncodeLengthOctets(challenge_len)+challenge_len;
		  EncodeLength(ptr, chalkey_len);
		  ptr +=NumEncodeLengthOctets(chalkey_len);
		  *ptr++ = 0x04;  /* OCTET STRING */
		  *ptr++ = challenge_len;
		  bcopy(challenge, ptr, challenge_len);
		  ptr += challenge_len;
		  *ptr++ = 0x04;  /* OCTET STRING */
		  EncodeLength(ptr, i);
		  ptr += NumEncodeLengthOctets(i);
		  bcopy(key, ptr, i);
		  chalkey_len = 1+NumEncodeLengthOctets(chalkey_len)+chalkey_len;
		  Data(ap, RSA_ENCPWD_CHALLENGEKEY, (void *)chalkey, chalkey_len);
		}
		break;
		
	default:
		Data(ap, RSA_ENCPWD_REJECT, 0, 0);
		break;
	}
}


	void
rsaencpwd_reply(ap, data, cnt)
	Authenticator *ap;
	unsigned char *data;
	int cnt;
{
	Session_Key skey;
	KTEXT_ST token;
	Block enckey;
	int r, pubkey_len;
	char        randchal[CHAL_SZ], *cp;
	char        chalkey[160], pubkey[128], *ptr;

	if (cnt-- < 1)
		return;
	switch (*data++) {
	case RSA_ENCPWD_REJECT:
		if (cnt > 0) {
			printf("[ RSA_ENCPWD refuses authentication because %.*s ]\r\n",
				cnt, data);
		} else
			printf("[ RSA_ENCPWD refuses authentication ]\r\n");
		auth_send_retry();
		return;
	case RSA_ENCPWD_ACCEPT:
		printf("[ RSA_ENCPWD accepts you ]\n");
		auth_finished(ap, AUTH_USER);
		return;
	case RSA_ENCPWD_CHALLENGEKEY:
		/*
		 * Verify that the response to the challenge is correct.
		 */

		bcopy((void *)data, (void *)chalkey, cnt);
		ptr = (char *) &chalkey[0];
		ptr += DecodeHeaderLength(chalkey);
		if (*ptr != 0x04) {
                  return;
                }
		*ptr++;
		challenge_len = DecodeValueLength(ptr);
		ptr += NumEncodeLengthOctets(challenge_len);
		bcopy(ptr, challenge, challenge_len);
		ptr += challenge_len;
		if (*ptr != 0x04) {
                  return;
                }
                *ptr++;
		pubkey_len = DecodeValueLength(ptr);
		ptr += NumEncodeLengthOctets(pubkey_len);
		bcopy(ptr, pubkey, pubkey_len);
		bzero(user_passwd, sizeof(user_passwd));
		local_des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0);
		UserPassword = user_passwd;
		Challenge = challenge;
		r = init_rsa_encpwd(&token, user_passwd, challenge, challenge_len, pubkey);
		if (r < 0) {
		  token.length = 1;
		}

		if (!Data(ap, RSA_ENCPWD_AUTH, (void *)token.dat, token.length)) {
		  return;
		}

		break;

	default:
		return;
	}
}

	int
rsaencpwd_status(ap, name, level)
	Authenticator *ap;
	char *name;
	int level;
{

	if (level < AUTH_USER)
		return(level);

	if (UserNameRequested && rsaencpwd_passwdok(UserNameRequested, UserPassword)) {
		strcpy(name, UserNameRequested);
		return(AUTH_VALID);
	} else {
		return(AUTH_USER);
	}
}

#define	BUMP(buf, len)		while (*(buf)) {++(buf), --(len);}
#define	ADDC(buf, len, c)	if ((len) > 0) {*(buf)++ = (c); --(len);}

	void
rsaencpwd_printsub(data, cnt, buf, buflen)
	unsigned char *data, *buf;
	int cnt, buflen;
{
	char lbuf[32];
	register int i;

	buf[buflen-1] = '\0';		/* make sure its NULL terminated */
	buflen -= 1;

	switch(data[3]) {
	case RSA_ENCPWD_REJECT:	/* Rejected (reason might follow) */
		strncpy((char *)buf, " REJECT ", buflen);
		goto common;

	case RSA_ENCPWD_ACCEPT:	/* Accepted (name might follow) */
		strncpy((char *)buf, " ACCEPT ", buflen);
	common:
		BUMP(buf, buflen);
		if (cnt <= 4)
			break;
		ADDC(buf, buflen, '"');
		for (i = 4; i < cnt; i++)
			ADDC(buf, buflen, data[i]);
		ADDC(buf, buflen, '"');
		ADDC(buf, buflen, '\0');
		break;

	case RSA_ENCPWD_AUTH:		/* Authentication data follows */
		strncpy((char *)buf, " AUTH", buflen);
		goto common2;

	case RSA_ENCPWD_CHALLENGEKEY:
		strncpy((char *)buf, " CHALLENGEKEY", buflen);
		goto common2;

	default:
		sprintf(lbuf, " %d (unknown)", data[3]);
		strncpy((char *)buf, lbuf, buflen);
	common2:
		BUMP(buf, buflen);
		for (i = 4; i < cnt; i++) {
			sprintf(lbuf, " %d", data[i]);
			strncpy((char *)buf, lbuf, buflen);
			BUMP(buf, buflen);
		}
		break;
	}
}

int rsaencpwd_passwdok(name, passwd)
char *name, *passwd;
{
  char *crypt();
  char *salt, *p;
  struct passwd *pwd;
  int   passwdok_status = 0;

  if (pwd = getpwnam(name))
    salt = pwd->pw_passwd;
  else salt = "xx";

  p = crypt(passwd, salt);

  if (pwd && !strcmp(p, pwd->pw_passwd)) {
    passwdok_status = 1;
  } else passwdok_status = 0;
  return(passwdok_status);
}

#endif

#ifdef notdef

prkey(msg, key)
	char *msg;
	unsigned char *key;
{
	register int i;
	printf("%s:", msg);
	for (i = 0; i < 8; i++)
		printf(" %3d", key[i]);
	printf("\r\n");
}
#endif
Commit	Line	Data
640d6f08	1	/*-
11794364 KB	2	* Copyright (c) 1992, 1993
11794364 KB	3	* The Regents of the University of California. All rights reserved.
640d6f08	4	*
ad787160 C	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	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.
	20	*
	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
	31	* SUCH DAMAGE.
640d6f08 DB	32	*/
	33
	34	#ifndef lint
ad787160	35	static char sccsid[] = "@(#)rsaencpwd.c 8.1 (Berkeley) 6/4/93";
640d6f08 DB	36	#endif /* not lint */
	37
	38
	39	#ifdef RSA_ENCPWD
	40	/*
	41	* COPYRIGHT (C) 1990 DIGITAL EQUIPMENT CORPORATION
	42	* ALL RIGHTS RESERVED
	43	*
	44	* "Digital Equipment Corporation authorizes the reproduction,
	45	* distribution and modification of this software subject to the following
	46	* restrictions:
	47	*
	48	* 1. Any partial or whole copy of this software, or any modification
	49	* thereof, must include this copyright notice in its entirety.
	50	*
	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.
	56	*
	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.
	59	*
	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.
	65	*
	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"
	70	*
	71	*/
	72
	73	#include <sys/types.h>
	74	#include <arpa/telnet.h>
	75	#include <pwd.h>
	76	#include <stdio.h>
	77
	78	#ifdef __STDC__
	79	#include <stdlib.h>
	80	#endif
	81	#ifdef NO_STRING_H
	82	#include <strings.h>
	83	#else
	84	#include <string.h>
	85	#endif
	86
	87	#include "encrypt.h"
	88	#include "auth.h"
	89	#include "misc.h"
	90	#include "cdc.h"
	91
	92	extern auth_debug_mode;
	93
	94	static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
	95	AUTHTYPE_RSA_ENCPWD, };
	96	static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
	97	TELQUAL_NAME, };
	98
	99	#define RSA_ENCPWD_AUTH 0 /* Authentication data follows */
100	#define RSA_ENCPWD_REJECT 1 /* Rejected (reason might follow) */
101	#define RSA_ENCPWD_ACCEPT 2 /* Accepted */
102	#define RSA_ENCPWD_CHALLENGEKEY 3 /* Challenge and public key */
103
104	#define NAME_SZ 40
105	#define CHAL_SZ 20
106	#define PWD_SZ 40
107
108	static KTEXT_ST auth;
109	static char name[NAME_SZ];
110	static char user_passwd[PWD_SZ];
111	static char key_file[2*NAME_SZ];
112	static char lhostname[NAME_SZ];
113	static char challenge[CHAL_SZ];
114	static int challenge_len;
115
116	static int
117	Data(ap, type, d, c)
118	Authenticator *ap;
119	int type;
120	void *d;
121	int c;
122	{
123	unsigned char *p = str_data + 4;
124	unsigned char cd = (unsigned char )d;
125
126	if (c == -1)
127	c = strlen((char *)cd);
128
129	if (0) {
130	printf("%s:%d: [%d] (%d)",
131	str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
132	str_data[3],
133	type, c);
134	printd(d, c);
135	printf("\r\n");
136	}
137	*p++ = ap->type;
138	*p++ = ap->way;
139	if (type != NULL) *p++ = type;
140	while (c-- > 0) {
141	if ((p++ = cd++) == IAC)
142	*p++ = IAC;
143	}
144	*p++ = IAC;
145	*p++ = SE;
146	if (str_data[3] == TELQUAL_IS)
147	printsub('>', &str_data[2], p - (&str_data[2]));
148	return(net_write(str_data, p - str_data));
149	}
150
151	int
152	rsaencpwd_init(ap, server)
153	Authenticator *ap;
154	int server;
155	{
156	char *cp;
157	FILE *fp;
158
159	if (server) {
160	str_data[3] = TELQUAL_REPLY;
161	bzero(key_file, sizeof(key_file));
162	gethostname(lhostname, sizeof(lhostname));
163	if ((cp = index(lhostname, '.')) != 0) *cp = '\0';
164	strcpy(key_file, "/etc/.");
165	strcat(key_file, lhostname);
166	strcat(key_file, "_privkey");
167	if ((fp=fopen(key_file, "r"))==NULL) return(0);
168	fclose(fp);
169	} else {
170	str_data[3] = TELQUAL_IS;
171	}
172	return(1);
173	}
174
175	int
176	rsaencpwd_send(ap)
177	Authenticator *ap;
178	{
179
180	printf("[ Trying RSAENCPWD ... ]\n");
181	if (!UserNameRequested) {
182	return(0);
183	}
184	if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
185	return(0);
186	}
187	if (!Data(ap, NULL, (void *)NULL, 0)) {
188	return(0);
189	}
190
191
192	return(1);
193	}
194
195	void
196	rsaencpwd_is(ap, data, cnt)
197	Authenticator *ap;
198	unsigned char *data;
199	int cnt;
200	{
201	Session_Key skey;
202	Block datablock;
203	char r_passwd[PWD_SZ], r_user[NAME_SZ];
204	char *cp, key[160];
205	char chalkey[160], *ptr;
206	FILE *fp;
207	int r, i, j, chalkey_len, len;
208	time_t now;
209
210	cnt--;
211	switch (*data++) {
212	case RSA_ENCPWD_AUTH:
213	bcopy((void )data, (void )auth.dat, auth.length = cnt);
214
215	if ((fp=fopen(key_file, "r"))==NULL) {
216	Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
217	auth_finished(ap, AUTH_REJECT);
218	return;
219	}
220	/*
221	* get privkey
222	*/
223	fscanf(fp, "%x;", &len);
224	for (i=0;i<len;i++) {
225	j = getc(fp); key[i]=j;
226	}
227	fclose(fp);
228
229	r = accept_rsa_encpwd(&auth, key, challenge,
230	challenge_len, r_passwd);
231	if (r < 0) {
232	Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
233	auth_finished(ap, AUTH_REJECT);
234	return;
235	}
236	auth_encrypt_userpwd(r_passwd);
237	if (rsaencpwd_passwdok(UserNameRequested, UserPassword) == 0) {
238	/*
239	* illegal username and password
240	*/
241	Data(ap, RSA_ENCPWD_REJECT, (void *)"Illegal password", -1);
242	auth_finished(ap, AUTH_REJECT);
243	return;
244	}
245
246	Data(ap, RSA_ENCPWD_ACCEPT, (void *)0, 0);
247	auth_finished(ap, AUTH_USER);
248	break;
249
250
251	case IAC:
252
253	/*
254	* If we are doing mutual authentication, get set up to send
255	* the challange, and verify it when the response comes back.
256	*/
257	if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_ONE_WAY) {
258	register int i;
259
260
261	time(&now);
262	if ((now % 2) == 0) {
263	sprintf(challenge, "%x", now);
264	challenge_len = strlen(challenge);
265	} else {
266	strcpy(challenge, "randchal");
267	challenge_len = 8;
268	}
269
270	if ((fp=fopen(key_file, "r"))==NULL) {
271	Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
272	auth_finished(ap, AUTH_REJECT);
273	return;
274	}
275	/*
276	* skip privkey
277	*/
278	fscanf(fp, "%x;", &len);
279	for (i=0;i<len;i++) {
280	j = getc(fp);
281	}
282	/*
283	* get pubkey
284	*/
285	fscanf(fp, "%x;", &len);
286	for (i=0;i<len;i++) {
287	j = getc(fp); key[i]=j;
288	}
289	fclose(fp);
290	chalkey[0] = 0x30;
291	ptr = (char *) &chalkey[1];
292	chalkey_len = 1+NumEncodeLengthOctets(i)+i+1+NumEncodeLengthOctets(challenge_len)+challenge_len;
293	EncodeLength(ptr, chalkey_len);
294	ptr +=NumEncodeLengthOctets(chalkey_len);
295	ptr++ = 0x04; / OCTET STRING */
296	*ptr++ = challenge_len;
297	bcopy(challenge, ptr, challenge_len);
298	ptr += challenge_len;
299	ptr++ = 0x04; / OCTET STRING */
300	EncodeLength(ptr, i);
301	ptr += NumEncodeLengthOctets(i);
302	bcopy(key, ptr, i);
303	chalkey_len = 1+NumEncodeLengthOctets(chalkey_len)+chalkey_len;
304	Data(ap, RSA_ENCPWD_CHALLENGEKEY, (void *)chalkey, chalkey_len);
305	}
306	break;
307
308	default:
309	Data(ap, RSA_ENCPWD_REJECT, 0, 0);
310	break;
311	}
312	}
313
314
315	void
316	rsaencpwd_reply(ap, data, cnt)
317	Authenticator *ap;
318	unsigned char *data;
319	int cnt;
320	{
321	Session_Key skey;
322	KTEXT_ST token;
323	Block enckey;
324	int r, pubkey_len;
325	char randchal[CHAL_SZ], *cp;
326	char chalkey[160], pubkey[128], *ptr;
327
328	if (cnt-- < 1)
329	return;
330	switch (*data++) {
331	case RSA_ENCPWD_REJECT:
332	if (cnt > 0) {
333	printf("[ RSA_ENCPWD refuses authentication because %.*s ]\r\n",
334	cnt, data);
335	} else
336	printf("[ RSA_ENCPWD refuses authentication ]\r\n");
337	auth_send_retry();
338	return;
339	case RSA_ENCPWD_ACCEPT:
340	printf("[ RSA_ENCPWD accepts you ]\n");
341	auth_finished(ap, AUTH_USER);
342	return;
343	case RSA_ENCPWD_CHALLENGEKEY:
344	/*
345	* Verify that the response to the challenge is correct.
346	*/
347
348	bcopy((void )data, (void )chalkey, cnt);
349	ptr = (char *) &chalkey[0];
350	ptr += DecodeHeaderLength(chalkey);
351	if (*ptr != 0x04) {
352	return;
353	}
354	*ptr++;
355	challenge_len = DecodeValueLength(ptr);
356	ptr += NumEncodeLengthOctets(challenge_len);
357	bcopy(ptr, challenge, challenge_len);
358	ptr += challenge_len;
359	if (*ptr != 0x04) {
360	return;
361	}
362	*ptr++;
363	pubkey_len = DecodeValueLength(ptr);
364	ptr += NumEncodeLengthOctets(pubkey_len);
365	bcopy(ptr, pubkey, pubkey_len);
366	bzero(user_passwd, sizeof(user_passwd));
367	local_des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0);
368	UserPassword = user_passwd;
369	Challenge = challenge;
370	r = init_rsa_encpwd(&token, user_passwd, challenge, challenge_len, pubkey);
371	if (r < 0) {
372	token.length = 1;
373	}
374
375	if (!Data(ap, RSA_ENCPWD_AUTH, (void *)token.dat, token.length)) {
376	return;
377	}
378
379	break;
380
381	default:
382	return;
383	}
384	}
385
386	int
387	rsaencpwd_status(ap, name, level)
388	Authenticator *ap;
389	char *name;
390	int level;
391	{
392
393	if (level < AUTH_USER)
394	return(level);
395
396	if (UserNameRequested && rsaencpwd_passwdok(UserNameRequested, UserPassword)) {
397	strcpy(name, UserNameRequested);
398	return(AUTH_VALID);
399	} else {
400	return(AUTH_USER);
401	}
402	}
403
404	#define BUMP(buf, len) while (*(buf)) {++(buf), --(len);}
405	#define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}
406
407	void
408	rsaencpwd_printsub(data, cnt, buf, buflen)
409	unsigned char data, buf;
410	int cnt, buflen;
411	{
412	char lbuf[32];
413	register int i;
414
415	buf[buflen-1] = '\0'; /* make sure its NULL terminated */
416	buflen -= 1;
417
418	switch(data[3]) {
419	case RSA_ENCPWD_REJECT: /* Rejected (reason might follow) */
420	strncpy((char *)buf, " REJECT ", buflen);
421	goto common;
422
423	case RSA_ENCPWD_ACCEPT: /* Accepted (name might follow) */
424	strncpy((char *)buf, " ACCEPT ", buflen);
425	common:
426	BUMP(buf, buflen);
427	if (cnt <= 4)
428	break;
429	ADDC(buf, buflen, '"');
430	for (i = 4; i < cnt; i++)
431	ADDC(buf, buflen, data[i]);
432	ADDC(buf, buflen, '"');
433	ADDC(buf, buflen, '\0');
434	break;
435
436	case RSA_ENCPWD_AUTH: /* Authentication data follows */
437	strncpy((char *)buf, " AUTH", buflen);
438	goto common2;
439
440	case RSA_ENCPWD_CHALLENGEKEY:
441	strncpy((char *)buf, " CHALLENGEKEY", buflen);
442	goto common2;
443
444	default:
445	sprintf(lbuf, " %d (unknown)", data[3]);
446	strncpy((char *)buf, lbuf, buflen);
447	common2:
448	BUMP(buf, buflen);
449	for (i = 4; i < cnt; i++) {
450	sprintf(lbuf, " %d", data[i]);
451	strncpy((char *)buf, lbuf, buflen);
452	BUMP(buf, buflen);
453	}
454	break;
455	}
456	}
457
458	int rsaencpwd_passwdok(name, passwd)
459	char name, passwd;
460	{
461	char *crypt();
462	char salt, p;
463	struct passwd *pwd;
464	int passwdok_status = 0;
465
466	if (pwd = getpwnam(name))
467	salt = pwd->pw_passwd;
468	else salt = "xx";
469
470	p = crypt(passwd, salt);
471
472	if (pwd && !strcmp(p, pwd->pw_passwd)) {
473	passwdok_status = 1;
474	} else passwdok_status = 0;
475	return(passwdok_status);
476	}
477
478	#endif
479
480	#ifdef notdef
481
482	prkey(msg, key)
483	char *msg;
484	unsigned char *key;
485	{
486	register int i;
487	printf("%s:", msg);
488	for (i = 0; i < 8; i++)
489	printf(" %3d", key[i]);
490	printf("\r\n");
491	}
492	#endif