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
83IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
84			ssl_undefined_function,
85			ssl23_connect,
86			ssl23_get_client_method)
87
88int ssl23_connect(SSL *s)
89	{
90	BUF_MEM *buf=NULL;
91	unsigned long Time=(unsigned long)time(NULL);
92	void (*cb)(const SSL *ssl,int type,int val)=NULL;
93	int ret= -1;
94	int new_state,state;
95
96	RAND_add(&Time,sizeof(Time),0);
97	ERR_clear_error();
98	clear_sys_error();
99
100	if (s->info_callback != NULL)
101		cb=s->info_callback;
102	else if (s->ctx->info_callback != NULL)
103		cb=s->ctx->info_callback;
104
105	s->in_handshake++;
106	if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
107
108	for (;;)
109		{
110		state=s->state;
111
112		switch(s->state)
113			{
114		case SSL_ST_BEFORE:
115		case SSL_ST_CONNECT:
116		case SSL_ST_BEFORE|SSL_ST_CONNECT:
117		case SSL_ST_OK|SSL_ST_CONNECT:
118
119			if (s->session != NULL)
120				{
121				SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
122				ret= -1;
123				goto end;
124				}
125			s->server=0;
126			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
127
128			/* s->version=TLS1_VERSION; */
129			s->type=SSL_ST_CONNECT;
130
131			if (s->init_buf == NULL)
132				{
133				if ((buf=BUF_MEM_new()) == NULL)
134					{
135					ret= -1;
136					goto end;
137					}
138				if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
139					{
140					ret= -1;
141					goto end;
142					}
143				s->init_buf=buf;
144				buf=NULL;
145				}
146
147			if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
148
149			ssl3_init_finished_mac(s);
150
151			s->state=SSL23_ST_CW_CLNT_HELLO_A;
152			s->ctx->stats.sess_connect++;
153			s->init_num=0;
154			break;
155
156		case SSL23_ST_CW_CLNT_HELLO_A:
157		case SSL23_ST_CW_CLNT_HELLO_B:
158
159			s->shutdown=0;
160			ret=ssl23_client_hello(s);
161			if (ret <= 0) goto end;
162			s->state=SSL23_ST_CR_SRVR_HELLO_A;
163			s->init_num=0;
164
165			break;
166
167		case SSL23_ST_CR_SRVR_HELLO_A:
168		case SSL23_ST_CR_SRVR_HELLO_B:
169			ret=ssl23_get_server_hello(s);
170			if (ret >= 0) cb=NULL;
171			goto end;
172			/* break; */
173
174		default:
175			SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
176			ret= -1;
177			goto end;
178			/* break; */
179			}
180
181		if (s->debug) { (void)BIO_flush(s->wbio); }
182
183		if ((cb != NULL) && (s->state != state))
184			{
185			new_state=s->state;
186			s->state=state;
187			cb(s,SSL_CB_CONNECT_LOOP,1);
188			s->state=new_state;
189			}
190		}
191end:
192	s->in_handshake--;
193	if (buf != NULL)
194		BUF_MEM_free(buf);
195	if (cb != NULL)
196		cb(s,SSL_CB_CONNECT_EXIT,ret);
197	return(ret);
198	}
199
200
201static int ssl23_client_hello(SSL *s)
202	{
203	unsigned char *buf;
204	unsigned char *p,*d;
205	int i,ch_len;
206	unsigned long Time,l;
207	int ssl2_compat;
208	int version = 0, version_major, version_minor;
209#ifndef OPENSSL_NO_COMP
210	int j;
211	SSL_COMP *comp;
212#endif
213	int ret;
214
215	ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1;
216
217	if (!(s->options & SSL_OP_NO_TLSv1))
218		{
219		version = TLS1_VERSION;
220		}
221	else if (!(s->options & SSL_OP_NO_SSLv3))
222		{
223		version = SSL3_VERSION;
224		}
225	else if (!(s->options & SSL_OP_NO_SSLv2))
226		{
227		version = SSL2_VERSION;
228		}
229#ifndef OPENSSL_NO_TLSEXT
230	if (version != SSL2_VERSION)
231		{
232		/* have to disable SSL 2.0 compatibility if we need TLS extensions */
233
234		if (s->tlsext_hostname != NULL)
235			ssl2_compat = 0;
236		if (s->tlsext_status_type != -1)
237			ssl2_compat = 0;
238		}
239#endif
240
241	buf=(unsigned char *)s->init_buf->data;
242	if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
243		{
244#if 0
245		/* don't reuse session-id's */
246		if (!ssl_get_new_session(s,0))
247			{
248			return(-1);
249			}
250#endif
251
252		p=s->s3->client_random;
253		Time=(unsigned long)time(NULL);		/* Time */
254		l2n(Time,p);
255		if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
256			return -1;
257
258		if (version == TLS1_VERSION)
259			{
260			version_major = TLS1_VERSION_MAJOR;
261			version_minor = TLS1_VERSION_MINOR;
262			}
263#ifdef OPENSSL_FIPS
264		else if(FIPS_mode())
265			{
266			SSLerr(SSL_F_SSL23_CLIENT_HELLO,
267					SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
268			return -1;
269			}
270#endif
271		else if (version == SSL3_VERSION)
272			{
273			version_major = SSL3_VERSION_MAJOR;
274			version_minor = SSL3_VERSION_MINOR;
275			}
276		else if (version == SSL2_VERSION)
277			{
278			version_major = SSL2_VERSION_MAJOR;
279			version_minor = SSL2_VERSION_MINOR;
280			}
281		else
282			{
283			SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
284			return(-1);
285			}
286
287		s->client_version = version;
288
289		if (ssl2_compat)
290			{
291			/* create SSL 2.0 compatible Client Hello */
292
293			/* two byte record header will be written last */
294			d = &(buf[2]);
295			p = d + 9; /* leave space for message type, version, individual length fields */
296
297			*(d++) = SSL2_MT_CLIENT_HELLO;
298			*(d++) = version_major;
299			*(d++) = version_minor;
300
301			/* Ciphers supported */
302			i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
303			if (i == 0)
304				{
305				/* no ciphers */
306				SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
307				return -1;
308				}
309			s2n(i,d);
310			p+=i;
311
312			/* put in the session-id length (zero since there is no reuse) */
313#if 0
314			s->session->session_id_length=0;
315#endif
316			s2n(0,d);
317
318			if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
319				ch_len=SSL2_CHALLENGE_LENGTH;
320			else
321				ch_len=SSL2_MAX_CHALLENGE_LENGTH;
322
323			/* write out sslv2 challenge */
324			if (SSL3_RANDOM_SIZE < ch_len)
325				i=SSL3_RANDOM_SIZE;
326			else
327				i=ch_len;
328			s2n(i,d);
329			memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
330			if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
331				return -1;
332
333			memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
334			p+=i;
335
336			i= p- &(buf[2]);
337			buf[0]=((i>>8)&0xff)|0x80;
338			buf[1]=(i&0xff);
339
340			/* number of bytes to write */
341			s->init_num=i+2;
342			s->init_off=0;
343
344			ssl3_finish_mac(s,&(buf[2]),i);
345			}
346		else
347			{
348			/* create Client Hello in SSL 3.0/TLS 1.0 format */
349
350			/* do the record header (5 bytes) and handshake message header (4 bytes) last */
351			d = p = &(buf[9]);
352
353			*(p++) = version_major;
354			*(p++) = version_minor;
355
356			/* Random stuff */
357			memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
358			p += SSL3_RANDOM_SIZE;
359
360			/* Session ID (zero since there is no reuse) */
361			*(p++) = 0;
362
363			/* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
364			i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
365			if (i == 0)
366				{
367				SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
368				return -1;
369				}
370			s2n(i,p);
371			p+=i;
372#ifdef OPENSSL_NO_COMP
373			*(p++)=1;
374#else
375			/* COMPRESSION */
376			if (s->ctx->comp_methods == NULL)
377				j=0;
378			else
379				j=sk_SSL_COMP_num(s->ctx->comp_methods);
380			*(p++)=1+j;
381			for (i=0; i<j; i++)
382				{
383				comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
384				*(p++)=comp->id;
385				}
386#endif
387			*(p++)=0; /* Add the NULL method */
388#ifndef OPENSSL_NO_TLSEXT
389			if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
390				{
391				SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
392				return -1;
393				}
394#endif
395
396			l = p-d;
397			*p = 42;
398
399			/* fill in 4-byte handshake header */
400			d=&(buf[5]);
401			*(d++)=SSL3_MT_CLIENT_HELLO;
402			l2n3(l,d);
403
404			l += 4;
405
406			if (l > SSL3_RT_MAX_PLAIN_LENGTH)
407				{
408				SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
409				return -1;
410				}
411
412			/* fill in 5-byte record header */
413			d=buf;
414			*(d++) = SSL3_RT_HANDSHAKE;
415			*(d++) = version_major;
416			*(d++) = version_minor; /* arguably we should send the *lowest* suported version here
417			                         * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
418			s2n((int)l,d);
419
420			/* number of bytes to write */
421			s->init_num=p-buf;
422			s->init_off=0;
423
424			ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
425			}
426
427		s->state=SSL23_ST_CW_CLNT_HELLO_B;
428		s->init_off=0;
429		}
430
431	/* SSL3_ST_CW_CLNT_HELLO_B */
432	ret = ssl23_write_bytes(s);
433
434	if ((ret >= 2) && s->msg_callback)
435		{
436		/* Client Hello has been sent; tell msg_callback */
437
438		if (ssl2_compat)
439			s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
440		else
441			s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
442		}
443
444	return ret;
445	}
446
447static int ssl23_get_server_hello(SSL *s)
448	{
449	char buf[8];
450	unsigned char *p;
451	int i;
452	int n;
453
454	n=ssl23_read_bytes(s,7);
455
456	if (n != 7) return(n);
457	p=s->packet;
458
459	memcpy(buf,p,n);
460
461	if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
462		(p[5] == 0x00) && (p[6] == 0x02))
463		{
464#ifdef OPENSSL_NO_SSL2
465		SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
466		goto err;
467#else
468		/* we are talking sslv2 */
469		/* we need to clean up the SSLv3 setup and put in the
470		 * sslv2 stuff. */
471		int ch_len;
472
473		if (s->options & SSL_OP_NO_SSLv2)
474			{
475			SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
476			goto err;
477			}
478		if (s->s2 == NULL)
479			{
480			if (!ssl2_new(s))
481				goto err;
482			}
483		else
484			ssl2_clear(s);
485
486		if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
487			ch_len=SSL2_CHALLENGE_LENGTH;
488		else
489			ch_len=SSL2_MAX_CHALLENGE_LENGTH;
490
491		/* write out sslv2 challenge */
492		i=(SSL3_RANDOM_SIZE < ch_len)
493			?SSL3_RANDOM_SIZE:ch_len;
494		s->s2->challenge_length=i;
495		memcpy(s->s2->challenge,
496			&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
497
498		if (s->s3 != NULL) ssl3_free(s);
499
500		if (!BUF_MEM_grow_clean(s->init_buf,
501			SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
502			{
503			SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
504			goto err;
505			}
506
507		s->state=SSL2_ST_GET_SERVER_HELLO_A;
508		if (!(s->client_version == SSL2_VERSION))
509			/* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
510			s->s2->ssl2_rollback=1;
511
512		/* setup the 7 bytes we have read so we get them from
513		 * the sslv2 buffer */
514		s->rstate=SSL_ST_READ_HEADER;
515		s->packet_length=n;
516		s->packet= &(s->s2->rbuf[0]);
517		memcpy(s->packet,buf,n);
518		s->s2->rbuf_left=n;
519		s->s2->rbuf_offs=0;
520
521		/* we have already written one */
522		s->s2->write_sequence=1;
523
524		s->method=SSLv2_client_method();
525		s->handshake_func=s->method->ssl_connect;
526#endif
527		}
528	else if (p[1] == SSL3_VERSION_MAJOR &&
529	         ((p[2] == SSL3_VERSION_MINOR) ||
530                  (p[2] == TLS1_VERSION_MINOR)) &&
531	         ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
532	          (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2)))
533		{
534		/* we have sslv3 or tls1 (server hello or alert) */
535
536		if ((p[2] == SSL3_VERSION_MINOR) &&
537			!(s->options & SSL_OP_NO_SSLv3))
538			{
539#ifdef OPENSSL_FIPS
540			if(FIPS_mode())
541				{
542				SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
543					SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
544				goto err;
545				}
546#endif
547			s->version=SSL3_VERSION;
548			s->method=SSLv3_client_method();
549			}
550		else if ((p[2] == TLS1_VERSION_MINOR) &&
551			!(s->options & SSL_OP_NO_TLSv1))
552			{
553			s->version=TLS1_VERSION;
554			s->method=TLSv1_client_method();
555			}
556		else
557			{
558			SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
559			goto err;
560			}
561
562		if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING)
563			{
564			/* fatal alert */
565
566			void (*cb)(const SSL *ssl,int type,int val)=NULL;
567			int j;
568
569			if (s->info_callback != NULL)
570				cb=s->info_callback;
571			else if (s->ctx->info_callback != NULL)
572				cb=s->ctx->info_callback;
573
574			i=p[5];
575			if (cb != NULL)
576				{
577				j=(i<<8)|p[6];
578				cb(s,SSL_CB_READ_ALERT,j);
579				}
580
581			if (s->msg_callback)
582				s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg);
583
584			s->rwstate=SSL_NOTHING;
585			SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
586			goto err;
587			}
588
589		if (!ssl_init_wbio_buffer(s,1)) goto err;
590
591		/* we are in this state */
592		s->state=SSL3_ST_CR_SRVR_HELLO_A;
593
594		/* put the 7 bytes we have read into the input buffer
595		 * for SSLv3 */
596		s->rstate=SSL_ST_READ_HEADER;
597		s->packet_length=n;
598		if (s->s3->rbuf.buf == NULL)
599			if (!ssl3_setup_buffers(s))
600				goto err;
601		s->packet= &(s->s3->rbuf.buf[0]);
602		memcpy(s->packet,buf,n);
603		s->s3->rbuf.left=n;
604		s->s3->rbuf.offset=0;
605
606		s->handshake_func=s->method->ssl_connect;
607		}
608	else
609		{
610		SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL);
611		goto err;
612		}
613	s->init_num=0;
614
615	/* Since, if we are sending a ssl23 client hello, we are not
616	 * reusing a session-id */
617	if (!ssl_get_new_session(s,0))
618		goto err;
619
620	return(SSL_connect(s));
621err:
622	return(-1);
623	}
624
625