summaryrefslogtreecommitdiffstats
path: root/contrib/telnet/libtelnet/rsaencpwd.c
blob: fba0c6b61735af017beccd8bc093d5109eb23f54 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
/*-
 * 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.
 */

#include <sys/cdefs.h>

__FBSDID("$FreeBSD$");

#ifndef lint
static char sccsid[] = "@(#)rsaencpwd.c	8.3 (Berkeley) 5/30/95";
#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>
#include <stdlib.h>
#include <string.h>

#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;
		memset(key_file, 0, sizeof(key_file));
		gethostname(lhostname, sizeof(lhostname));
		if ((cp = strchr(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:
		memmove((void *)auth.dat, (void *)data, 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 challenge, 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;
		  memmove(ptr, challenge, challenge_len);
		  ptr += challenge_len;
		  *ptr++ = 0x04;  /* OCTET STRING */
		  EncodeLength(ptr, i);
		  ptr += NumEncodeLengthOctets(i);
		  memmove(ptr, key, 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.
		 */

		memmove((void *)chalkey, (void *)data, cnt);
		ptr = (char *) &chalkey[0];
		ptr += DecodeHeaderLength(chalkey);
		if (*ptr != 0x04) {
		  return;
		}
		*ptr++;
		challenge_len = DecodeValueLength(ptr);
		ptr += NumEncodeLengthOctets(challenge_len);
		memmove(challenge, ptr, challenge_len);
		ptr += challenge_len;
		if (*ptr != 0x04) {
		  return;
		}
		*ptr++;
		pubkey_len = DecodeValueLength(ptr);
		ptr += NumEncodeLengthOctets(pubkey_len);
		memmove(pubkey, ptr, pubkey_len);
		memset(user_passwd, 0, 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
OpenPOWER on IntegriCloud