1/* ssl/s23_clnt.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
59#include <stdio.h>
60#include "ssl_locl.h"
61#include <openssl/buffer.h>
62#include <openssl/rand.h>
63#include <openssl/objects.h>
64#include <openssl/evp.h>
65
66static SSL_METHOD *ssl23_get_client_method(int ver);
67static int ssl23_client_hello(SSL *s);
68static int ssl23_get_server_hello(SSL *s);
69static SSL_METHOD *ssl23_get_client_method(int ver)
70	{
71#ifndef OPENSSL_NO_SSL2
72	if (ver == SSL2_VERSION)
73		return(SSLv2_client_method());
74#endif
75	if (ver == SSL3_VERSION)
76		return(SSLv3_client_method());
77	else if (ver == TLS1_VERSION)
78		return(TLSv1_client_method());
79	else
80		return(NULL);
81	}
82
83SSL_METHOD *SSLv23_client_method(void)
84	{
85	static int init=1;
86	static SSL_METHOD SSLv23_client_data;
87
88	if (init)
89		{
90		CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
91
92		if (init)
93			{
94			memcpy((char *)&SSLv23_client_data,
95				(char *)sslv23_base_method(),sizeof(SSL_METHOD));
96			SSLv23_client_data.ssl_connect=ssl23_connect;
97			SSLv23_client_data.get_ssl_method=ssl23_get_client_method;
98			init=0;
99			}
100
101		CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
102		}
103	return(&SSLv23_client_data);
104	}
105
106int ssl23_connect(SSL *s)
107	{
108	BUF_MEM *buf=NULL;
109	unsigned long Time=time(NULL);
110	void (*cb)(const SSL *ssl,int type,int val)=NULL;
111	int ret= -1;
112	int new_state,state;
113
114	RAND_add(&Time,sizeof(Time),0);
115	ERR_clear_error();
116	clear_sys_error();
117
118	if (s->info_callback != NULL)
119		cb=s->info_callback;
120	else if (s->ctx->info_callback != NULL)
121		cb=s->ctx->info_callback;
122
123	s->in_handshake++;
124	if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
125
126	for (;;)
127		{
128		state=s->state;
129
130		switch(s->state)
131			{
132		case SSL_ST_BEFORE:
133		case SSL_ST_CONNECT:
134		case SSL_ST_BEFORE|SSL_ST_CONNECT:
135		case SSL_ST_OK|SSL_ST_CONNECT:
136
137			if (s->session != NULL)
138				{
139				SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
140				ret= -1;
141				goto end;
142				}
143			s->server=0;
144			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
145
146			/* s->version=TLS1_VERSION; */
147			s->type=SSL_ST_CONNECT;
148
149			if (s->init_buf == NULL)
150				{
151				if ((buf=BUF_MEM_new()) == NULL)
152					{
153					ret= -1;
154					goto end;
155					}
156				if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
157					{
158					ret= -1;
159					goto end;
160					}
161				s->init_buf=buf;
162				buf=NULL;
163				}
164
165			if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
166
167			ssl3_init_finished_mac(s);
168
169			s->state=SSL23_ST_CW_CLNT_HELLO_A;
170			s->ctx->stats.sess_connect++;
171			s->init_num=0;
172			break;
173
174		case SSL23_ST_CW_CLNT_HELLO_A:
175		case SSL23_ST_CW_CLNT_HELLO_B:
176
177			s->shutdown=0;
178			ret=ssl23_client_hello(s);
179			if (ret <= 0) goto end;
180			s->state=SSL23_ST_CR_SRVR_HELLO_A;
181			s->init_num=0;
182
183			break;
184
185		case SSL23_ST_CR_SRVR_HELLO_A:
186		case SSL23_ST_CR_SRVR_HELLO_B:
187			ret=ssl23_get_server_hello(s);
188			if (ret >= 0) cb=NULL;
189			goto end;
190			/* break; */
191
192		default:
193			SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
194			ret= -1;
195			goto end;
196			/* break; */
197			}
198
199		if (s->debug) { (void)BIO_flush(s->wbio); }
200
201		if ((cb != NULL) && (s->state != state))
202			{
203			new_state=s->state;
204			s->state=state;
205			cb(s,SSL_CB_CONNECT_LOOP,1);
206			s->state=new_state;
207			}
208		}
209end:
210	s->in_handshake--;
211	if (buf != NULL)
212		BUF_MEM_free(buf);
213	if (cb != NULL)
214		cb(s,SSL_CB_CONNECT_EXIT,ret);
215	return(ret);
216	}
217
218
219static int ssl23_client_hello(SSL *s)
220	{
221	unsigned char *buf;
222	unsigned char *p,*d;
223	int i,ch_len;
224	int ret;
225
226	buf=(unsigned char *)s->init_buf->data;
227	if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
228		{
229#if 0
230		/* don't reuse session-id's */
231		if (!ssl_get_new_session(s,0))
232			{
233			return(-1);
234			}
235#endif
236
237		p=s->s3->client_random;
238		if(RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE) <= 0)
239		    return -1;
240
241		/* Do the message type and length last */
242		d= &(buf[2]);
243		p=d+9;
244
245		*(d++)=SSL2_MT_CLIENT_HELLO;
246		if (!(s->options & SSL_OP_NO_TLSv1))
247			{
248			*(d++)=TLS1_VERSION_MAJOR;
249			*(d++)=TLS1_VERSION_MINOR;
250			s->client_version=TLS1_VERSION;
251			}
252#ifdef OPENSSL_FIPS
253		else if(FIPS_mode())
254			{
255			SSLerr(SSL_F_SSL23_CLIENT_HELLO,
256					SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
257			return -1;
258			}
259#endif
260		else if (!(s->options & SSL_OP_NO_SSLv3))
261			{
262			*(d++)=SSL3_VERSION_MAJOR;
263			*(d++)=SSL3_VERSION_MINOR;
264			s->client_version=SSL3_VERSION;
265			}
266		else if (!(s->options & SSL_OP_NO_SSLv2))
267			{
268			*(d++)=SSL2_VERSION_MAJOR;
269			*(d++)=SSL2_VERSION_MINOR;
270			s->client_version=SSL2_VERSION;
271			}
272		else
273			{
274			SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
275			return(-1);
276			}
277
278		/* Ciphers supported */
279		i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p);
280		if (i == 0)
281			{
282			/* no ciphers */
283			SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
284			return(-1);
285			}
286		s2n(i,d);
287		p+=i;
288
289		/* put in the session-id, zero since there is no
290		 * reuse. */
291#if 0
292		s->session->session_id_length=0;
293#endif
294		s2n(0,d);
295
296		if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
297			ch_len=SSL2_CHALLENGE_LENGTH;
298		else
299			ch_len=SSL2_MAX_CHALLENGE_LENGTH;
300
301		/* write out sslv2 challenge */
302		if (SSL3_RANDOM_SIZE < ch_len)
303			i=SSL3_RANDOM_SIZE;
304		else
305			i=ch_len;
306		s2n(i,d);
307		memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
308		if(RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
309			return -1;
310
311		memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
312		p+=i;
313
314		i= p- &(buf[2]);
315		buf[0]=((i>>8)&0xff)|0x80;
316		buf[1]=(i&0xff);
317
318		s->state=SSL23_ST_CW_CLNT_HELLO_B;
319		/* number of bytes to write */
320		s->init_num=i+2;
321		s->init_off=0;
322
323		ssl3_finish_mac(s,&(buf[2]),i);
324		}
325
326	/* SSL3_ST_CW_CLNT_HELLO_B */
327	ret = ssl23_write_bytes(s);
328	if (ret >= 2)
329		if (s->msg_callback)
330			s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
331	return ret;
332	}
333
334static int ssl23_get_server_hello(SSL *s)
335	{
336	char buf[8];
337	unsigned char *p;
338	int i;
339	int n;
340
341	n=ssl23_read_bytes(s,7);
342
343	if (n != 7) return(n);
344	p=s->packet;
345
346	memcpy(buf,p,n);
347
348	if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
349		(p[5] == 0x00) && (p[6] == 0x02))
350		{
351#ifdef OPENSSL_NO_SSL2
352		SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
353		goto err;
354#else
355		/* we are talking sslv2 */
356		/* we need to clean up the SSLv3 setup and put in the
357		 * sslv2 stuff. */
358		int ch_len;
359
360		if (s->options & SSL_OP_NO_SSLv2)
361			{
362			SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
363			goto err;
364			}
365		if (s->s2 == NULL)
366			{
367			if (!ssl2_new(s))
368				goto err;
369			}
370		else
371			ssl2_clear(s);
372
373		if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
374			ch_len=SSL2_CHALLENGE_LENGTH;
375		else
376			ch_len=SSL2_MAX_CHALLENGE_LENGTH;
377
378		/* write out sslv2 challenge */
379		i=(SSL3_RANDOM_SIZE < ch_len)
380			?SSL3_RANDOM_SIZE:ch_len;
381		s->s2->challenge_length=i;
382		memcpy(s->s2->challenge,
383			&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
384
385		if (s->s3 != NULL) ssl3_free(s);
386
387		if (!BUF_MEM_grow_clean(s->init_buf,
388			SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
389			{
390			SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
391			goto err;
392			}
393
394		s->state=SSL2_ST_GET_SERVER_HELLO_A;
395		if (!(s->client_version == SSL2_VERSION))
396			/* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
397			s->s2->ssl2_rollback=1;
398
399		/* setup the 5 bytes we have read so we get them from
400		 * the sslv2 buffer */
401		s->rstate=SSL_ST_READ_HEADER;
402		s->packet_length=n;
403		s->packet= &(s->s2->rbuf[0]);
404		memcpy(s->packet,buf,n);
405		s->s2->rbuf_left=n;
406		s->s2->rbuf_offs=0;
407
408		/* we have already written one */
409		s->s2->write_sequence=1;
410
411		s->method=SSLv2_client_method();
412		s->handshake_func=s->method->ssl_connect;
413#endif
414		}
415	else if ((p[0] == SSL3_RT_HANDSHAKE) &&
416		 (p[1] == SSL3_VERSION_MAJOR) &&
417		 ((p[2] == SSL3_VERSION_MINOR) ||
418		  (p[2] == TLS1_VERSION_MINOR)) &&
419		 (p[5] == SSL3_MT_SERVER_HELLO))
420		{
421		/* we have sslv3 or tls1 */
422
423		if (!ssl_init_wbio_buffer(s,1)) goto err;
424
425		/* we are in this state */
426		s->state=SSL3_ST_CR_SRVR_HELLO_A;
427
428		/* put the 5 bytes we have read into the input buffer
429		 * for SSLv3 */
430		s->rstate=SSL_ST_READ_HEADER;
431		s->packet_length=n;
432		s->packet= &(s->s3->rbuf.buf[0]);
433		memcpy(s->packet,buf,n);
434		s->s3->rbuf.left=n;
435		s->s3->rbuf.offset=0;
436
437		if ((p[2] == SSL3_VERSION_MINOR) &&
438			!(s->options & SSL_OP_NO_SSLv3))
439			{
440#ifdef OPENSSL_FIPS
441			if(FIPS_mode())
442				{
443				SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
444					SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
445				goto err;
446				}
447#endif
448			s->version=SSL3_VERSION;
449			s->method=SSLv3_client_method();
450			}
451		else if ((p[2] == TLS1_VERSION_MINOR) &&
452			!(s->options & SSL_OP_NO_TLSv1))
453			{
454			s->version=TLS1_VERSION;
455			s->method=TLSv1_client_method();
456			}
457		else
458			{
459			SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
460			goto err;
461			}
462
463		s->handshake_func=s->method->ssl_connect;
464		}
465	else if ((p[0] == SSL3_RT_ALERT) &&
466		 (p[1] == SSL3_VERSION_MAJOR) &&
467		 ((p[2] == SSL3_VERSION_MINOR) ||
468		  (p[2] == TLS1_VERSION_MINOR)) &&
469		 (p[3] == 0) &&
470		 (p[4] == 2))
471		{
472		void (*cb)(const SSL *ssl,int type,int val)=NULL;
473		int j;
474
475		/* An alert */
476		if (s->info_callback != NULL)
477			cb=s->info_callback;
478		else if (s->ctx->info_callback != NULL)
479			cb=s->ctx->info_callback;
480
481		i=p[5];
482		if (cb != NULL)
483			{
484			j=(i<<8)|p[6];
485			cb(s,SSL_CB_READ_ALERT,j);
486			}
487
488		s->rwstate=SSL_NOTHING;
489		SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
490		goto err;
491		}
492	else
493		{
494		SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
495		goto err;
496		}
497	s->init_num=0;
498
499	/* Since, if we are sending a ssl23 client hello, we are not
500	 * reusing a session-id */
501	if (!ssl_get_new_session(s,0))
502		goto err;
503
504	s->first_packet=1;
505	return(SSL_connect(s));
506err:
507	return(-1);
508	}
509
510