s2_lib.c revision 55949 
1/* ssl/s2_lib.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 *
58 * $FreeBSD: head/crypto/openssl/ssl/s2_lib.c 55949 2000-01-14 05:24:08Z kris $
59 */
60
61#ifndef NO_SSL2
62#include <stdio.h>
63#include <openssl/rsa.h>
64#include <openssl/objects.h>
65#include <openssl/md5.h>
66#include "ssl_locl.h"
67
68static long ssl2_default_timeout(void );
69const char *ssl2_version_str="SSLv2" OPENSSL_VERSION_PTEXT;
70
71#define SSL2_NUM_CIPHERS (sizeof(ssl2_ciphers)/sizeof(SSL_CIPHER))
72
73OPENSSL_GLOBAL SSL_CIPHER ssl2_ciphers[]={
74/* NULL_WITH_MD5 v3 */
75#if 0
76	{
77	1,
78	SSL2_TXT_NULL_WITH_MD5,
79	SSL2_CK_NULL_WITH_MD5,
80	SSL_kRSA|SSL_aRSA|SSL_eNULL|SSL_MD5|SSL_EXP40|SSL_SSLV2,
81	0,
82	SSL_ALL_CIPHERS,
83	},
84#endif
85/* RC4_128_EXPORT40_WITH_MD5 */
86	{
87	1,
88	SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
89	SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
90	SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_EXP40|SSL_SSLV2,
91	SSL2_CF_5_BYTE_ENC,
92	SSL_ALL_CIPHERS,
93	},
94/* RC4_128_WITH_MD5 */
95	{
96	1,
97	SSL2_TXT_RC4_128_WITH_MD5,
98	SSL2_CK_RC4_128_WITH_MD5,
99	SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_NOT_EXP|SSL_SSLV2|SSL_MEDIUM,
100	0,
101	SSL_ALL_CIPHERS,
102	},
103/* RC2_128_CBC_EXPORT40_WITH_MD5 */
104	{
105	1,
106	SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
107	SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
108	SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_EXP40|SSL_SSLV2,
109	SSL2_CF_5_BYTE_ENC,
110	SSL_ALL_CIPHERS,
111	},
112/* RC2_128_CBC_WITH_MD5 */
113	{
114	1,
115	SSL2_TXT_RC2_128_CBC_WITH_MD5,
116	SSL2_CK_RC2_128_CBC_WITH_MD5,
117	SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_NOT_EXP|SSL_SSLV2|SSL_MEDIUM,
118	0,
119	SSL_ALL_CIPHERS,
120	},
121/* IDEA_128_CBC_WITH_MD5 */
122	{
123	1,
124	SSL2_TXT_IDEA_128_CBC_WITH_MD5,
125	SSL2_CK_IDEA_128_CBC_WITH_MD5,
126	SSL_kRSA|SSL_aRSA|SSL_IDEA|SSL_MD5|SSL_NOT_EXP|SSL_SSLV2|SSL_MEDIUM,
127	0,
128	SSL_ALL_CIPHERS,
129	},
130/* DES_64_CBC_WITH_MD5 */
131	{
132	1,
133	SSL2_TXT_DES_64_CBC_WITH_MD5,
134	SSL2_CK_DES_64_CBC_WITH_MD5,
135	SSL_kRSA|SSL_aRSA|SSL_DES|SSL_MD5|SSL_NOT_EXP|SSL_SSLV2|SSL_LOW,
136	0,
137	SSL_ALL_CIPHERS,
138	},
139/* DES_192_EDE3_CBC_WITH_MD5 */
140	{
141	1,
142	SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5,
143	SSL2_CK_DES_192_EDE3_CBC_WITH_MD5,
144	SSL_kRSA|SSL_aRSA|SSL_3DES|SSL_MD5|SSL_NOT_EXP|SSL_SSLV2|SSL_HIGH,
145	0,
146	SSL_ALL_CIPHERS,
147	},
148/* RC4_64_WITH_MD5 */
149#if 1
150	{
151	1,
152	SSL2_TXT_RC4_64_WITH_MD5,
153	SSL2_CK_RC4_64_WITH_MD5,
154	SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2|SSL_LOW,
155	SSL2_CF_8_BYTE_ENC,
156	SSL_ALL_CIPHERS,
157	},
158#endif
159/* NULL SSLeay (testing) */
160#if 0
161	{
162	0,
163	SSL2_TXT_NULL,
164	SSL2_CK_NULL,
165	0,
166	SSL_ALL_CIPHERS,
167	},
168#endif
169
170/* end of list :-) */
171	};
172
173static SSL_METHOD SSLv2_data= {
174	SSL2_VERSION,
175	ssl2_new,	/* local */
176	ssl2_clear,	/* local */
177	ssl2_free,	/* local */
178	ssl_undefined_function,
179	ssl_undefined_function,
180	ssl2_read,
181	ssl2_peek,
182	ssl2_write,
183	ssl2_shutdown,
184	ssl_ok,	/* NULL - renegotiate */
185	ssl_ok,	/* NULL - check renegotiate */
186	ssl2_ctrl,	/* local */
187	ssl2_ctx_ctrl,	/* local */
188	ssl2_get_cipher_by_char,
189	ssl2_put_cipher_by_char,
190	ssl2_pending,
191	ssl2_num_ciphers,
192	ssl2_get_cipher,
193	ssl_bad_method,
194	ssl2_default_timeout,
195	&ssl3_undef_enc_method,
196	};
197
198static long ssl2_default_timeout(void)
199	{
200	return(300);
201	}
202
203SSL_METHOD *sslv2_base_method(void)
204	{
205	return(&SSLv2_data);
206	}
207
208int ssl2_num_ciphers(void)
209	{
210	return(SSL2_NUM_CIPHERS);
211	}
212
213SSL_CIPHER *ssl2_get_cipher(unsigned int u)
214	{
215	if (u < SSL2_NUM_CIPHERS)
216		return(&(ssl2_ciphers[SSL2_NUM_CIPHERS-1-u]));
217	else
218		return(NULL);
219	}
220
221int ssl2_pending(SSL *s)
222	{
223	return(s->s2->ract_data_length);
224	}
225
226int ssl2_new(SSL *s)
227	{
228	SSL2_CTX *s2;
229
230	if ((s2=(SSL2_CTX *)Malloc(sizeof(SSL2_CTX))) == NULL) goto err;
231	memset(s2,0,sizeof(SSL2_CTX));
232
233	if ((s2->rbuf=(unsigned char *)Malloc(
234		SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) == NULL) goto err;
235	if ((s2->wbuf=(unsigned char *)Malloc(
236		SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) == NULL) goto err;
237	s->s2=s2;
238
239	ssl2_clear(s);
240	return(1);
241err:
242	if (s2 != NULL)
243		{
244		if (s2->wbuf != NULL) Free(s2->wbuf);
245		if (s2->rbuf != NULL) Free(s2->rbuf);
246		Free(s2);
247		}
248	return(0);
249	}
250
251void ssl2_free(SSL *s)
252	{
253	SSL2_CTX *s2;
254
255	if(s == NULL)
256	    return;
257
258	s2=s->s2;
259	if (s2->rbuf != NULL) Free(s2->rbuf);
260	if (s2->wbuf != NULL) Free(s2->wbuf);
261	memset(s2,0,sizeof(SSL2_CTX));
262	Free(s2);
263	s->s2=NULL;
264	}
265
266void ssl2_clear(SSL *s)
267	{
268	SSL2_CTX *s2;
269	unsigned char *rbuf,*wbuf;
270
271	s2=s->s2;
272
273	rbuf=s2->rbuf;
274	wbuf=s2->wbuf;
275
276	memset(s2,0,sizeof(SSL2_CTX));
277
278	s2->rbuf=rbuf;
279	s2->wbuf=wbuf;
280	s2->clear_text=1;
281	s->packet=s2->rbuf;
282	s->version=SSL2_VERSION;
283	s->packet_length=0;
284	}
285
286long ssl2_ctrl(SSL *s, int cmd, long larg, char *parg)
287	{
288	int ret=0;
289
290	switch(cmd)
291		{
292	case SSL_CTRL_GET_SESSION_REUSED:
293		ret=s->hit;
294		break;
295	default:
296		break;
297		}
298	return(ret);
299	}
300
301long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, char *parg)
302	{
303	return(0);
304	}
305
306/* This function needs to check if the ciphers required are actually
307 * available */
308SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
309	{
310	static int init=1;
311	static SSL_CIPHER *sorted[SSL2_NUM_CIPHERS];
312	SSL_CIPHER c,*cp= &c,**cpp;
313	unsigned long id;
314	int i;
315
316	if (init)
317		{
318		CRYPTO_w_lock(CRYPTO_LOCK_SSL);
319
320		for (i=0; i<SSL2_NUM_CIPHERS; i++)
321			sorted[i]= &(ssl2_ciphers[i]);
322
323		qsort(  (char *)sorted,
324			SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER *),
325			FP_ICC ssl_cipher_ptr_id_cmp);
326
327		CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
328		init=0;
329		}
330
331	id=0x02000000L|((unsigned long)p[0]<<16L)|
332		((unsigned long)p[1]<<8L)|(unsigned long)p[2];
333	c.id=id;
334	cpp=(SSL_CIPHER **)OBJ_bsearch((char *)&cp,
335		(char *)sorted,
336		SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER *),
337		(int (*)())ssl_cipher_ptr_id_cmp);
338	if ((cpp == NULL) || !(*cpp)->valid)
339		return(NULL);
340	else
341		return(*cpp);
342	}
343
344int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
345	{
346	long l;
347
348	if (p != NULL)
349		{
350		l=c->id;
351		if ((l & 0xff000000) != 0x02000000) return(0);
352		p[0]=((unsigned char)(l>>16L))&0xFF;
353		p[1]=((unsigned char)(l>> 8L))&0xFF;
354		p[2]=((unsigned char)(l     ))&0xFF;
355		}
356	return(3);
357	}
358
359void ssl2_generate_key_material(SSL *s)
360	{
361	unsigned int i;
362	MD5_CTX ctx;
363	unsigned char *km;
364	unsigned char c='0';
365
366#ifdef CHARSET_EBCDIC
367	c = os_toascii['0']; /* Must be an ASCII '0', not EBCDIC '0',
368				see SSLv2 docu */
369#endif
370
371	km=s->s2->key_material;
372	for (i=0; i<s->s2->key_material_length; i+=MD5_DIGEST_LENGTH)
373		{
374		MD5_Init(&ctx);
375
376		MD5_Update(&ctx,s->session->master_key,s->session->master_key_length);
377		MD5_Update(&ctx,(unsigned char *)&c,1);
378		c++;
379		MD5_Update(&ctx,s->s2->challenge,s->s2->challenge_length);
380		MD5_Update(&ctx,s->s2->conn_id,s->s2->conn_id_length);
381		MD5_Final(km,&ctx);
382		km+=MD5_DIGEST_LENGTH;
383		}
384	}
385
386void ssl2_return_error(SSL *s, int err)
387	{
388	if (!s->error)
389		{
390		s->error=3;
391		s->error_code=err;
392
393		ssl2_write_error(s);
394		}
395	}
396
397
398void ssl2_write_error(SSL *s)
399	{
400	unsigned char buf[3];
401	int i,error;
402
403	buf[0]=SSL2_MT_ERROR;
404	buf[1]=(s->error_code>>8)&0xff;
405	buf[2]=(s->error_code)&0xff;
406
407/*	state=s->rwstate;*/
408	error=s->error;
409	s->error=0;
410	i=ssl2_write(s,&(buf[3-error]),error);
411/*	if (i == error) s->rwstate=state; */
412
413	if (i < 0)
414		s->error=error;
415	else if (i != s->error)
416		s->error=error-i;
417	/* else
418		s->error=0; */
419	}
420
421int ssl2_shutdown(SSL *s)
422	{
423	s->shutdown=(SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
424	return(1);
425	}
426#endif
427