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

/*-
 * Copyright (c) 1992 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)rsaencpwd.c	5.1 (Berkeley) %G%";
#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 DB	1	/*-
	2	* Copyright (c) 1992 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* %sccs.include.redist.c%
	6	*/
	7
	8	#ifndef lint
	9	static char sccsid[] = "@(#)rsaencpwd.c 5.1 (Berkeley) %G%";
	10	#endif /* not lint */
	11
	12
	13	#ifdef RSA_ENCPWD
	14	/*
	15	* COPYRIGHT (C) 1990 DIGITAL EQUIPMENT CORPORATION
	16	* ALL RIGHTS RESERVED
	17	*
	18	* "Digital Equipment Corporation authorizes the reproduction,
	19	* distribution and modification of this software subject to the following
	20	* restrictions:
	21	*
	22	* 1. Any partial or whole copy of this software, or any modification
	23	* thereof, must include this copyright notice in its entirety.
	24	*
	25	* 2. This software is supplied "as is" with no warranty of any kind,
	26	* expressed or implied, for any purpose, including any warranty of fitness
	27	* or merchantibility. DIGITAL assumes no responsibility for the use or
	28	* reliability of this software, nor promises to provide any form of
	29	* support for it on any basis.
	30	*
	31	* 3. Distribution of this software is authorized only if no profit or
	32	* remuneration of any kind is received in exchange for such distribution.
	33	*
	34	* 4. This software produces public key authentication certificates
	35	* bearing an expiration date established by DIGITAL and RSA Data
	36	* Security, Inc. It may cease to generate certificates after the expiration
	37	* date. Any modification of this software that changes or defeats
	38	* the expiration date or its effect is unauthorized.
	39	*
	40	* 5. Software that will renew or extend the expiration date of
	41	* authentication certificates produced by this software may be obtained
	42	* from RSA Data Security, Inc., 10 Twin Dolphin Drive, Redwood City, CA
	43	* 94065, (415)595-8782, or from DIGITAL"
	44	*
	45	*/
	46
	47	#include <sys/types.h>
	48	#include <arpa/telnet.h>
	49	#include <pwd.h>
	50	#include <stdio.h>
	51
	52	#ifdef __STDC__
	53	#include <stdlib.h>
	54	#endif
	55	#ifdef NO_STRING_H
	56	#include <strings.h>
	57	#else
	58	#include <string.h>
	59	#endif
	60
	61	#include "encrypt.h"
	62	#include "auth.h"
	63	#include "misc.h"
	64	#include "cdc.h"
65
66	extern auth_debug_mode;
67
68	static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
69	AUTHTYPE_RSA_ENCPWD, };
70	static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
71	TELQUAL_NAME, };
72
73	#define RSA_ENCPWD_AUTH 0 /* Authentication data follows */
74	#define RSA_ENCPWD_REJECT 1 /* Rejected (reason might follow) */
75	#define RSA_ENCPWD_ACCEPT 2 /* Accepted */
76	#define RSA_ENCPWD_CHALLENGEKEY 3 /* Challenge and public key */
77
78	#define NAME_SZ 40
79	#define CHAL_SZ 20
80	#define PWD_SZ 40
81
82	static KTEXT_ST auth;
83	static char name[NAME_SZ];
84	static char user_passwd[PWD_SZ];
85	static char key_file[2*NAME_SZ];
86	static char lhostname[NAME_SZ];
87	static char challenge[CHAL_SZ];
88	static int challenge_len;
89
90	static int
91	Data(ap, type, d, c)
92	Authenticator *ap;
93	int type;
94	void *d;
95	int c;
96	{
97	unsigned char *p = str_data + 4;
98	unsigned char cd = (unsigned char )d;
99
100	if (c == -1)
101	c = strlen((char *)cd);
102
103	if (0) {
104	printf("%s:%d: [%d] (%d)",
105	str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
106	str_data[3],
107	type, c);
108	printd(d, c);
109	printf("\r\n");
110	}
111	*p++ = ap->type;
112	*p++ = ap->way;
113	if (type != NULL) *p++ = type;
114	while (c-- > 0) {
115	if ((p++ = cd++) == IAC)
116	*p++ = IAC;
117	}
118	*p++ = IAC;
119	*p++ = SE;
120	if (str_data[3] == TELQUAL_IS)
121	printsub('>', &str_data[2], p - (&str_data[2]));
122	return(net_write(str_data, p - str_data));
123	}
124
125	int
126	rsaencpwd_init(ap, server)
127	Authenticator *ap;
128	int server;
129	{
130	char *cp;
131	FILE *fp;
132
133	if (server) {
134	str_data[3] = TELQUAL_REPLY;
135	bzero(key_file, sizeof(key_file));
136	gethostname(lhostname, sizeof(lhostname));
137	if ((cp = index(lhostname, '.')) != 0) *cp = '\0';
138	strcpy(key_file, "/etc/.");
139	strcat(key_file, lhostname);
140	strcat(key_file, "_privkey");
141	if ((fp=fopen(key_file, "r"))==NULL) return(0);
142	fclose(fp);
143	} else {
144	str_data[3] = TELQUAL_IS;
145	}
146	return(1);
147	}
148
149	int
150	rsaencpwd_send(ap)
151	Authenticator *ap;
152	{
153
154	printf("[ Trying RSAENCPWD ... ]\n");
155	if (!UserNameRequested) {
156	return(0);
157	}
158	if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
159	return(0);
160	}
161	if (!Data(ap, NULL, (void *)NULL, 0)) {
162	return(0);
163	}
164
165
166	return(1);
167	}
168
169	void
170	rsaencpwd_is(ap, data, cnt)
171	Authenticator *ap;
172	unsigned char *data;
173	int cnt;
174	{
175	Session_Key skey;
176	Block datablock;
177	char r_passwd[PWD_SZ], r_user[NAME_SZ];
178	char *cp, key[160];
179	char chalkey[160], *ptr;
180	FILE *fp;
181	int r, i, j, chalkey_len, len;
182	time_t now;
183
184	cnt--;
185	switch (*data++) {
186	case RSA_ENCPWD_AUTH:
187	bcopy((void )data, (void )auth.dat, auth.length = cnt);
188
189	if ((fp=fopen(key_file, "r"))==NULL) {
190	Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
191	auth_finished(ap, AUTH_REJECT);
192	return;
193	}
194	/*
195	* get privkey
196	*/
197	fscanf(fp, "%x;", &len);
198	for (i=0;i<len;i++) {
199	j = getc(fp); key[i]=j;
200	}
201	fclose(fp);
202
203	r = accept_rsa_encpwd(&auth, key, challenge,
204	challenge_len, r_passwd);
205	if (r < 0) {
206	Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
207	auth_finished(ap, AUTH_REJECT);
208	return;
209	}
210	auth_encrypt_userpwd(r_passwd);
211	if (rsaencpwd_passwdok(UserNameRequested, UserPassword) == 0) {
212	/*
213	* illegal username and password
214	*/
215	Data(ap, RSA_ENCPWD_REJECT, (void *)"Illegal password", -1);
216	auth_finished(ap, AUTH_REJECT);
217	return;
218	}
219
220	Data(ap, RSA_ENCPWD_ACCEPT, (void *)0, 0);
221	auth_finished(ap, AUTH_USER);
222	break;
223
224
225	case IAC:
226
227	/*
228	* If we are doing mutual authentication, get set up to send
229	* the challange, and verify it when the response comes back.
230	*/
231	if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_ONE_WAY) {
232	register int i;
233
234
235	time(&now);
236	if ((now % 2) == 0) {
237	sprintf(challenge, "%x", now);
238	challenge_len = strlen(challenge);
239	} else {
240	strcpy(challenge, "randchal");
241	challenge_len = 8;
242	}
243
244	if ((fp=fopen(key_file, "r"))==NULL) {
245	Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
246	auth_finished(ap, AUTH_REJECT);
247	return;
248	}
249	/*
250	* skip privkey
251	*/
252	fscanf(fp, "%x;", &len);
253	for (i=0;i<len;i++) {
254	j = getc(fp);
255	}
256	/*
257	* get pubkey
258	*/
259	fscanf(fp, "%x;", &len);
260	for (i=0;i<len;i++) {
261	j = getc(fp); key[i]=j;
262	}
263	fclose(fp);
264	chalkey[0] = 0x30;
265	ptr = (char *) &chalkey[1];
266	chalkey_len = 1+NumEncodeLengthOctets(i)+i+1+NumEncodeLengthOctets(challenge_len)+challenge_len;
267	EncodeLength(ptr, chalkey_len);
268	ptr +=NumEncodeLengthOctets(chalkey_len);
269	ptr++ = 0x04; / OCTET STRING */
270	*ptr++ = challenge_len;
271	bcopy(challenge, ptr, challenge_len);
272	ptr += challenge_len;
273	ptr++ = 0x04; / OCTET STRING */
274	EncodeLength(ptr, i);
275	ptr += NumEncodeLengthOctets(i);
276	bcopy(key, ptr, i);
277	chalkey_len = 1+NumEncodeLengthOctets(chalkey_len)+chalkey_len;
278	Data(ap, RSA_ENCPWD_CHALLENGEKEY, (void *)chalkey, chalkey_len);
279	}
280	break;
281
282	default:
283	Data(ap, RSA_ENCPWD_REJECT, 0, 0);
284	break;
285	}
286	}
287
288
289	void
290	rsaencpwd_reply(ap, data, cnt)
291	Authenticator *ap;
292	unsigned char *data;
293	int cnt;
294	{
295	Session_Key skey;
296	KTEXT_ST token;
297	Block enckey;
298	int r, pubkey_len;
299	char randchal[CHAL_SZ], *cp;
300	char chalkey[160], pubkey[128], *ptr;
301
302	if (cnt-- < 1)
303	return;
304	switch (*data++) {
305	case RSA_ENCPWD_REJECT:
306	if (cnt > 0) {
307	printf("[ RSA_ENCPWD refuses authentication because %.*s ]\r\n",
308	cnt, data);
309	} else
310	printf("[ RSA_ENCPWD refuses authentication ]\r\n");
311	auth_send_retry();
312	return;
313	case RSA_ENCPWD_ACCEPT:
314	printf("[ RSA_ENCPWD accepts you ]\n");
315	auth_finished(ap, AUTH_USER);
316	return;
317	case RSA_ENCPWD_CHALLENGEKEY:
318	/*
319	* Verify that the response to the challenge is correct.
320	*/
321
322	bcopy((void )data, (void )chalkey, cnt);
323	ptr = (char *) &chalkey[0];
324	ptr += DecodeHeaderLength(chalkey);
325	if (*ptr != 0x04) {
326	return;
327	}
328	*ptr++;
329	challenge_len = DecodeValueLength(ptr);
330	ptr += NumEncodeLengthOctets(challenge_len);
331	bcopy(ptr, challenge, challenge_len);
332	ptr += challenge_len;
333	if (*ptr != 0x04) {
334	return;
335	}
336	*ptr++;
337	pubkey_len = DecodeValueLength(ptr);
338	ptr += NumEncodeLengthOctets(pubkey_len);
339	bcopy(ptr, pubkey, pubkey_len);
340	bzero(user_passwd, sizeof(user_passwd));
341	local_des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0);
342	UserPassword = user_passwd;
343	Challenge = challenge;
344	r = init_rsa_encpwd(&token, user_passwd, challenge, challenge_len, pubkey);
345	if (r < 0) {
346	token.length = 1;
347	}
348
349	if (!Data(ap, RSA_ENCPWD_AUTH, (void *)token.dat, token.length)) {
350	return;
351	}
352
353	break;
354
355	default:
356	return;
357	}
358	}
359
360	int
361	rsaencpwd_status(ap, name, level)
362	Authenticator *ap;
363	char *name;
364	int level;
365	{
366
367	if (level < AUTH_USER)
368	return(level);
369
370	if (UserNameRequested && rsaencpwd_passwdok(UserNameRequested, UserPassword)) {
371	strcpy(name, UserNameRequested);
372	return(AUTH_VALID);
373	} else {
374	return(AUTH_USER);
375	}
376	}
377
378	#define BUMP(buf, len) while (*(buf)) {++(buf), --(len);}
379	#define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}
380
381	void
382	rsaencpwd_printsub(data, cnt, buf, buflen)
383	unsigned char data, buf;
384	int cnt, buflen;
385	{
386	char lbuf[32];
387	register int i;
388
389	buf[buflen-1] = '\0'; /* make sure its NULL terminated */
390	buflen -= 1;
391
392	switch(data[3]) {
393	case RSA_ENCPWD_REJECT: /* Rejected (reason might follow) */
394	strncpy((char *)buf, " REJECT ", buflen);
395	goto common;
396
397	case RSA_ENCPWD_ACCEPT: /* Accepted (name might follow) */
398	strncpy((char *)buf, " ACCEPT ", buflen);
399	common:
400	BUMP(buf, buflen);
401	if (cnt <= 4)
402	break;
403	ADDC(buf, buflen, '"');
404	for (i = 4; i < cnt; i++)
405	ADDC(buf, buflen, data[i]);
406	ADDC(buf, buflen, '"');
407	ADDC(buf, buflen, '\0');
408	break;
409
410	case RSA_ENCPWD_AUTH: /* Authentication data follows */
411	strncpy((char *)buf, " AUTH", buflen);
412	goto common2;
413
414	case RSA_ENCPWD_CHALLENGEKEY:
415	strncpy((char *)buf, " CHALLENGEKEY", buflen);
416	goto common2;
417
418	default:
419	sprintf(lbuf, " %d (unknown)", data[3]);
420	strncpy((char *)buf, lbuf, buflen);
421	common2:
422	BUMP(buf, buflen);
423	for (i = 4; i < cnt; i++) {
424	sprintf(lbuf, " %d", data[i]);
425	strncpy((char *)buf, lbuf, buflen);
426	BUMP(buf, buflen);
427	}
428	break;
429	}
430	}
431
432	int rsaencpwd_passwdok(name, passwd)
433	char name, passwd;
434	{
435	char *crypt();
436	char salt, p;
437	struct passwd *pwd;
438	int passwdok_status = 0;
439
440	if (pwd = getpwnam(name))
441	salt = pwd->pw_passwd;
442	else salt = "xx";
443
444	p = crypt(passwd, salt);
445
446	if (pwd && !strcmp(p, pwd->pw_passwd)) {
447	passwdok_status = 1;
448	} else passwdok_status = 0;
449	return(passwdok_status);
450	}
451
452	#endif
453
454	#ifdef notdef
455
456	prkey(msg, key)
457	char *msg;
458	unsigned char *key;
459	{
460	register int i;
461	printf("%s:", msg);
462	for (i = 0; i < 8; i++)
463	printf(" %3d", key[i]);
464	printf("\r\n");
465	}
466	#endif