s3_srvr.c 36.6 KB
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/* ssl/s3_srvr.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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 cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#define REUSE_CIPHER_BUG

#include <stdio.h>
#include "buffer.h"
#include "rand.h"
#include "objects.h"
#include "evp.h"
#include "x509.h"
#include "ssl_locl.h"

#define BREAK	break
/* SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_MALLOC_FAILURE);
 * SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
 * SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
 * SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_MALLOC_FAILURE);
 * SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 */

#ifndef NOPROTO
static int ssl3_get_client_hello(SSL *s);
static int ssl3_send_server_hello(SSL *s);
static int ssl3_send_server_key_exchange(SSL *s);
static int ssl3_send_certificate_request(SSL *s);
static int ssl3_send_server_done(SSL *s);
static int ssl3_get_cert_verify(SSL *s);
static int ssl3_get_client_key_exchange(SSL *s);
static int ssl3_get_client_certificate(SSL *s);
static int ssl3_send_hello_request(SSL *s);

#else

static int ssl3_get_client_hello();
static int ssl3_send_server_hello();
static int ssl3_send_server_key_exchange();
static int ssl3_send_certificate_request();
static int ssl3_send_server_done();
static int ssl3_get_cert_verify();
static int ssl3_get_client_key_exchange();
static int ssl3_get_client_certificate();
static int ssl3_send_hello_request();

#endif

static SSL_METHOD *ssl3_get_server_method(ver)
int ver;
	{
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	if (ver == SSL3_VERSION)
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		return(SSLv3_server_method());
	else
		return(NULL);
	}

SSL_METHOD *SSLv3_server_method()
	{
	static int init=1;
	static SSL_METHOD SSLv3_server_data;

	if (init)
		{
		init=0;
		memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
			sizeof(SSL_METHOD));
		SSLv3_server_data.ssl_accept=ssl3_accept;
		SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
		}
	return(&SSLv3_server_data);
	}

int ssl3_accept(s)
SSL *s;
	{
	BUF_MEM *buf;
	unsigned long l,Time=time(NULL);
	void (*cb)()=NULL;
	long num1;
	int ret= -1;
	CERT *ct;
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	BIO *under;
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	int new_state,state,skip=0;

	RAND_seed((unsigned char *)&Time,sizeof(Time));
	ERR_clear_error();
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	clear_sys_error();
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	if (s->info_callback != NULL)
		cb=s->info_callback;
	else if (s->ctx->info_callback != NULL)
		cb=s->ctx->info_callback;

	/* init things to blank */
	if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
	s->in_handshake++;

#ifdef undef
	/* FIX THIS EAY EAY EAY */
	/* we don't actually need a cert, we just need a cert or a DH_tmp */
	if (((s->session == NULL) || (s->session->cert == NULL)) &&
		(s->cert == NULL))
		{
		SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
		ret= -1;
		goto end;
		}
#endif

	for (;;)
		{
		state=s->state;

		switch (s->state)
			{
		case SSL_ST_RENEGOTIATE:
			s->new_session=1;
			/* s->state=SSL_ST_ACCEPT; */

		case SSL_ST_BEFORE:
		case SSL_ST_ACCEPT:
		case SSL_ST_BEFORE|SSL_ST_ACCEPT:
		case SSL_ST_OK|SSL_ST_ACCEPT:

			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);

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			if ((s->version>>8) != 3)
				abort();
			/* s->version=SSL3_VERSION; */
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			s->type=SSL_ST_ACCEPT;

			if (s->init_buf == NULL)
				{
				if ((buf=BUF_MEM_new()) == NULL)
					{
					ret= -1;
					goto end;
					}
				if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
					{
					ret= -1;
					goto end;
					}
				s->init_buf=buf;
				}

			if (!ssl3_setup_buffers(s))
				{
				ret= -1;
				goto end;
				}

			/* Ok, we now need to push on a buffering BIO so that
			 * the output is sent in a way that TCP likes :-)
			 */
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			if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
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			s->init_num=0;

			if (s->state != SSL_ST_RENEGOTIATE)
				{
				s->state=SSL3_ST_SR_CLNT_HELLO_A;
				ssl3_init_finished_mac(s);
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				s->ctx->sess_accept++;
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				}
			else
				{
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				s->ctx->sess_accept_renegotiate++;
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				s->state=SSL3_ST_SW_HELLO_REQ_A;
				}
			break;

		case SSL3_ST_SW_HELLO_REQ_A:
		case SSL3_ST_SW_HELLO_REQ_B:

			s->shutdown=0;
			ret=ssl3_send_hello_request(s);
			if (ret <= 0) goto end;
			s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
			s->state=SSL3_ST_SW_FLUSH;
			s->init_num=0;

			ssl3_init_finished_mac(s);
			break;

		case SSL3_ST_SW_HELLO_REQ_C:
			/* remove buffering on output */
			under=BIO_pop(s->wbio);
			if (under != NULL)
				s->wbio=under;
			else
				abort(); /* ok */
			BIO_free(s->bbio);
			s->bbio=NULL;

			s->state=SSL_ST_OK;
			ret=1;
			goto end;
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			/* break; */
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		case SSL3_ST_SR_CLNT_HELLO_A:
		case SSL3_ST_SR_CLNT_HELLO_B:
		case SSL3_ST_SR_CLNT_HELLO_C:

			s->shutdown=0;
			ret=ssl3_get_client_hello(s);
			if (ret <= 0) goto end;
			s->state=SSL3_ST_SW_SRVR_HELLO_A;
			s->init_num=0;
			break;

		case SSL3_ST_SW_SRVR_HELLO_A:
		case SSL3_ST_SW_SRVR_HELLO_B:
			ret=ssl3_send_server_hello(s);
			if (ret <= 0) goto end;

			if (s->hit)
				s->state=SSL3_ST_SW_CHANGE_A;
			else
				s->state=SSL3_ST_SW_CERT_A;
			s->init_num=0;
			break;

		case SSL3_ST_SW_CERT_A:
		case SSL3_ST_SW_CERT_B:
			/* Check if it is anon DH */
			if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
				{
				ret=ssl3_send_server_certificate(s);
				if (ret <= 0) goto end;
				}
			else
				skip=1;
			s->state=SSL3_ST_SW_KEY_EXCH_A;
			s->init_num=0;
			break;

		case SSL3_ST_SW_KEY_EXCH_A:
		case SSL3_ST_SW_KEY_EXCH_B:
			l=s->s3->tmp.new_cipher->algorithms;
			if (s->session->cert == NULL)
				{
				if (s->cert != NULL)
					{
					CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
					s->session->cert=s->cert;
					}
				else
					{
					CRYPTO_add(&s->ctx->default_cert->references,1,CRYPTO_LOCK_SSL_CERT);
					s->session->cert=s->ctx->default_cert;
					}
				}
			ct=s->session->cert;

			/* clear this, it may get reset by
			 * send_server_key_exchange */
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			if (s->options & SSL_OP_EPHEMERAL_RSA)
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				s->s3->tmp.use_rsa_tmp=1;
			else
				s->s3->tmp.use_rsa_tmp=0;

			/* only send if a DH key exchange, fortezza or
			 * RSA but we have a sign only certificate */
			if ( s->s3->tmp.use_rsa_tmp ||
			    (l & (SSL_DH|SSL_kFZA)) ||
			    ((l & SSL_kRSA) &&
			     ((ct->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)||
			      ((l & SSL_EXPORT) &&
			       (EVP_PKEY_size(ct->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > 512)
			      )
			     )
			    )
			   )
				{
				ret=ssl3_send_server_key_exchange(s);
				if (ret <= 0) goto end;
				}
			else
				skip=1;

			s->state=SSL3_ST_SW_CERT_REQ_A;
			s->init_num=0;
			break;

		case SSL3_ST_SW_CERT_REQ_A:
		case SSL3_ST_SW_CERT_REQ_B:
			if (!(s->verify_mode & SSL_VERIFY_PEER) ||
				((s->session->peer != NULL) &&
				 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
				{
				/* no cert request */
				skip=1;
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				s->s3->tmp.cert_request=0;
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				s->state=SSL3_ST_SW_SRVR_DONE_A;
				}
			else
				{
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				s->s3->tmp.cert_request=1;
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				ret=ssl3_send_certificate_request(s);
				if (ret <= 0) goto end;
				s->state=SSL3_ST_SW_SRVR_DONE_A;
				s->init_num=0;
				}
			break;

		case SSL3_ST_SW_SRVR_DONE_A:
		case SSL3_ST_SW_SRVR_DONE_B:
			ret=ssl3_send_server_done(s);
			if (ret <= 0) goto end;
			s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
			s->state=SSL3_ST_SW_FLUSH;
			s->init_num=0;
			break;
		
		case SSL3_ST_SW_FLUSH:
			/* number of bytes to be flushed */
			num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
			if (num1 > 0)
				{
				s->rwstate=SSL_WRITING;
				num1=BIO_flush(s->wbio);
				if (num1 <= 0) { ret= -1; goto end; }
				s->rwstate=SSL_NOTHING;
				}

			s->state=s->s3->tmp.next_state;
			break;

		case SSL3_ST_SR_CERT_A:
		case SSL3_ST_SR_CERT_B:
			/* could be sent for a DH cert, even if we
			 * have not asked for it :-) */
			ret=ssl3_get_client_certificate(s);
			if (ret <= 0) goto end;
			s->init_num=0;
			s->state=SSL3_ST_SR_KEY_EXCH_A;
			break;

		case SSL3_ST_SR_KEY_EXCH_A:
		case SSL3_ST_SR_KEY_EXCH_B:
			ret=ssl3_get_client_key_exchange(s);
			if (ret <= 0) goto end;
			s->state=SSL3_ST_SR_CERT_VRFY_A;
			s->init_num=0;

			/* We need to get hashes here so if there is
			 * a client cert, it can be verified */ 
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			s->method->ssl3_enc->cert_verify_mac(s,
				&(s->s3->finish_dgst1),
				&(s->s3->tmp.finish_md[0]));
			s->method->ssl3_enc->cert_verify_mac(s,
				&(s->s3->finish_dgst2),
				&(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]));
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			break;

		case SSL3_ST_SR_CERT_VRFY_A:
		case SSL3_ST_SR_CERT_VRFY_B:

			/* we should decide if we expected this one */
			ret=ssl3_get_cert_verify(s);
			if (ret <= 0) goto end;

			s->state=SSL3_ST_SR_FINISHED_A;
			s->init_num=0;
			break;

		case SSL3_ST_SR_FINISHED_A:
		case SSL3_ST_SR_FINISHED_B:
			ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
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				SSL3_ST_SR_FINISHED_B);
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			if (ret <= 0) goto end;
			if (s->hit)
				s->state=SSL_ST_OK;
			else
				s->state=SSL3_ST_SW_CHANGE_A;
			s->init_num=0;
			break;

		case SSL3_ST_SW_CHANGE_A:
		case SSL3_ST_SW_CHANGE_B:

			s->session->cipher=s->s3->tmp.new_cipher;
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			if (!s->method->ssl3_enc->setup_key_block(s))
				{ ret= -1; goto end; }
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			ret=ssl3_send_change_cipher_spec(s,
				SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);

			if (ret <= 0) goto end;
			s->state=SSL3_ST_SW_FINISHED_A;
			s->init_num=0;

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			if (!s->method->ssl3_enc->change_cipher_state(s,
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				SSL3_CHANGE_CIPHER_SERVER_WRITE))
				{
				ret= -1;
				goto end;
				}

			break;

		case SSL3_ST_SW_FINISHED_A:
		case SSL3_ST_SW_FINISHED_B:
			ret=ssl3_send_finished(s,
				SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
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				s->method->ssl3_enc->server_finished,
				s->method->ssl3_enc->server_finished_len);
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			if (ret <= 0) goto end;
			s->state=SSL3_ST_SW_FLUSH;
			if (s->hit)
				s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
			else
				s->s3->tmp.next_state=SSL_ST_OK;
			s->init_num=0;
			break;

		case SSL_ST_OK:
			/* clean a few things up */
			ssl3_cleanup_key_block(s);

			BUF_MEM_free(s->init_buf);
			s->init_buf=NULL;

			/* remove buffering on output */
			under=BIO_pop(s->wbio);
			if (under != NULL)
				s->wbio=under;
			else
				abort(); /* ok */
			BIO_free(s->bbio);
			s->bbio=NULL;

			s->new_session=0;
			s->init_num=0;

			ssl_update_cache(s,SSL_SESS_CACHE_SERVER);

			s->ctx->sess_accept_good++;
			/* s->server=1; */
			s->handshake_func=ssl3_accept;
			ret=1;

			if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);

			goto end;
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			/* break; */
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		default:
			SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
			ret= -1;
			goto end;
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			/* break; */
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			}
		
		if (!s->s3->tmp.reuse_message && !skip)
			{
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			if (s->debug)
				{
				if ((ret=BIO_flush(s->wbio)) <= 0)
					goto end;
				}

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			if ((cb != NULL) && (s->state != state))
				{
				new_state=s->state;
				s->state=state;
				cb(s,SSL_CB_ACCEPT_LOOP,1);
				s->state=new_state;
				}
			}
		skip=0;
		}
end:
	/* BIO_flush(s->wbio); */

	if (cb != NULL)
		cb(s,SSL_CB_ACCEPT_EXIT,ret);
	s->in_handshake--;
	return(ret);
	}

static int ssl3_send_hello_request(s)
SSL *s;
	{
	unsigned char *p;

	if (s->state == SSL3_ST_SW_HELLO_REQ_A)
		{
		p=(unsigned char *)s->init_buf->data;
		*(p++)=SSL3_MT_CLIENT_REQUEST;
		*(p++)=0;
		*(p++)=0;
		*(p++)=0;

		s->state=SSL3_ST_SW_HELLO_REQ_B;
		/* number of bytes to write */
		s->init_num=4;
		s->init_off=0;
		}

	/* SSL3_ST_SW_HELLO_REQ_B */
	return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
	}

static int ssl3_get_client_hello(s)
SSL *s;
	{
	int i,j,ok,al,ret= -1;
	long n;
	unsigned long id;
	unsigned char *p,*d;
	SSL_CIPHER *c;
	STACK *ciphers=NULL;

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	/* We do this so that we will respond with our native type.
	 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
	 * This down switching should be handled by a different method.
	 * If we are SSLv3, we will respond with SSLv3, even if prompted with
	 * TLSv1.
	 */
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	if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
		{
		s->first_packet=1;
		s->state=SSL3_ST_SR_CLNT_HELLO_B;
		}
	n=ssl3_get_message(s,
		SSL3_ST_SR_CLNT_HELLO_B,
		SSL3_ST_SR_CLNT_HELLO_C,
		SSL3_MT_CLIENT_HELLO,
		SSL3_RT_MAX_PLAIN_LENGTH,
		&ok);

	if (!ok) return((int)n);
	d=p=(unsigned char *)s->init_buf->data;

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	/* The version number has already been checked in ssl3_get_message.
	 * I a native TLSv1/SSLv3 method, the match must be correct except
	 * perhaps for the first message */
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	p+=2;

	/* load the client random */
	memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
	p+=SSL3_RANDOM_SIZE;

	/* get the session-id */
	j= *(p++);

	s->hit=0;
	if (j == 0)
		{
		if (!ssl_get_new_session(s,1))
			goto err;
		}
	else
		{
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		i=ssl_get_prev_session(s,p,j);
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		if (i == 1)
			{ /* previous session */
			s->hit=1;
			}
		else
			{
			if (!ssl_get_new_session(s,1))
				goto err;
			}
		}

	p+=j;
	n2s(p,i);
	if ((i == 0) && (j != 0))
		{
		/* we need a cipher if we are not resuming a session */
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		al=SSL_AD_ILLEGAL_PARAMETER;
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		SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
		goto f_err;
		}
	if ((i+p) > (d+n))
		{
		/* not enough data */
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		al=SSL_AD_DECODE_ERROR;
638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664
		SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
		goto f_err;
		}
	if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
		== NULL))
		{
		goto err;
		}
	p+=i;

	/* If it is a hit, check that the cipher is in the list */
	if ((s->hit) && (i > 0))
		{
		j=0;
		id=s->session->cipher->id;

		for (i=0; i<sk_num(ciphers); i++)
			{
			c=(SSL_CIPHER *)sk_value(ciphers,i);
			if (c->id == id)
				{
				j=1;
				break;
				}
			}
		if (j == 0)
			{
665
			if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_num(ciphers) == 1))
666 667 668 669 670 671 672 673 674
				{
				/* Very bad for multi-threading.... */
				s->session->cipher=
					(SSL_CIPHER *)sk_value(ciphers,0);
				}
			else
				{
				/* we need to have the cipher in the cipher
				 * list if we are asked to reuse it */
675
				al=SSL_AD_ILLEGAL_PARAMETER;
676 677 678 679 680 681 682 683 684 685 686 687 688 689 690
				SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
				goto f_err;
				}
			}
		}

	/* compression */
	i= *(p++);
	for (j=0; j<i; j++)
		if (p[j] == 0) break;

	p+=i;
	if (j >= i)
		{
		/* no compress */
691
		al=SSL_AD_DECODE_ERROR;
692 693 694 695
		SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
		goto f_err;
		}

696 697
	/* TLS does not mind if there is extra stuff */
	if (s->version == SSL3_VERSION)
698
		{
699 700 701 702 703 704 705 706
		if (p > (d+n))
			{
			/* wrong number of bytes,
			 * there could be more to follow */
			al=SSL_AD_DECODE_ERROR;
			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
			goto f_err;
			}
707 708 709 710 711 712 713 714 715 716 717 718 719 720
		}

	/* do nothing with compression */

	/* Given s->session->ciphers and ssl_get_ciphers_by_id(s), we must
	 * pick a cipher */

	if (!s->hit)
		{
		if (s->session->ciphers != NULL)
			sk_free(s->session->ciphers);
		s->session->ciphers=ciphers;
		if (ciphers == NULL)
			{
721
			al=SSL_AD_ILLEGAL_PARAMETER;
722 723 724 725 726 727 728 729 730
			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
			goto f_err;
			}
		ciphers=NULL;
		c=ssl3_choose_cipher(s,s->session->ciphers,
			ssl_get_ciphers_by_id(s));

		if (c == NULL)
			{
731
			al=SSL_AD_HANDSHAKE_FAILURE;
732 733 734 735 736 737 738 739 740 741 742 743 744
			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
			goto f_err;
			}
		s->s3->tmp.new_cipher=c;
		}
	else
		{
		/* Session-id reuse */
#ifdef REUSE_CIPHER_BUG
		STACK *sk;
		SSL_CIPHER *nc=NULL;
		SSL_CIPHER *ec=NULL;

745
		if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
			{
			sk=s->session->ciphers;
			for (i=0; i<sk_num(sk); i++)
				{
				c=(SSL_CIPHER *)sk_value(sk,i);
				if (c->algorithms & SSL_eNULL)
					nc=c;
				if (c->algorithms & SSL_EXP)
					ec=c;
				}
			if (nc != NULL)
				s->s3->tmp.new_cipher=nc;
			else if (ec != NULL)
				s->s3->tmp.new_cipher=ec;
			else
				s->s3->tmp.new_cipher=s->session->cipher;
			}
		else
#endif
		s->s3->tmp.new_cipher=s->session->cipher;
		}
	
	/* we now have the following setup. 
	 * client_random
	 * cipher_list 		- our prefered list of ciphers
	 * ciphers 		- the clients prefered list of ciphers
	 * compression		- basically ignored right now
	 * ssl version is set	- sslv3
	 * s->session		- The ssl session has been setup.
	 * s->hit		- sesson reuse flag
	 * s->tmp.new_cipher	- the new cipher to use.
	 */

	ret=1;
	if (0)
		{
f_err:
		ssl3_send_alert(s,SSL3_AL_FATAL,al);
		}
err:
	if (ciphers != NULL) sk_free(ciphers);
	return(ret);
	}

static int ssl3_send_server_hello(s)
SSL *s;
	{
	unsigned char *buf;
	unsigned char *p,*d;
	int i,sl;
	unsigned long l,Time;

	if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
		{
		buf=(unsigned char *)s->init_buf->data;
		p=s->s3->server_random;
		Time=time(NULL);			/* Time */
		l2n(Time,p);
		RAND_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
		/* Do the message type and length last */
		d=p= &(buf[4]);

808 809
		*(p++)=s->version>>8;
		*(p++)=s->version&0xff;
810 811 812 813 814 815 816 817 818 819 820

		/* Random stuff */
		memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
		p+=SSL3_RANDOM_SIZE;

		/* now in theory we have 3 options to sending back the
		 * session id.  If it is a re-use, we send back the
		 * old session-id, if it is a new session, we send
		 * back the new session-id or we send back a 0 length
		 * session-id if we want it to be single use.
		 * Currently I will not implement the '0' length session-id
821
		 * 12-Jan-98 - I'll now support the '0' length stuff.
822
		 */
823 824
		if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
			s->session->session_id_length=0;
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917

		sl=s->session->session_id_length;
		*(p++)=sl;
		memcpy(p,s->session->session_id,sl);
		p+=sl;

		/* put the cipher */
		i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
		p+=i;

		/* put the compression method */
		*(p++)=0;

		/* do the header */
		l=(p-d);
		d=buf;
		*(d++)=SSL3_MT_SERVER_HELLO;
		l2n3(l,d);

		s->state=SSL3_ST_CW_CLNT_HELLO_B;
		/* number of bytes to write */
		s->init_num=p-buf;
		s->init_off=0;
		}

	/* SSL3_ST_CW_CLNT_HELLO_B */
	return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
	}

static int ssl3_send_server_done(s)
SSL *s;
	{
	unsigned char *p;

	if (s->state == SSL3_ST_SW_SRVR_DONE_A)
		{
		p=(unsigned char *)s->init_buf->data;

		/* do the header */
		*(p++)=SSL3_MT_SERVER_DONE;
		*(p++)=0;
		*(p++)=0;
		*(p++)=0;

		s->state=SSL3_ST_SW_SRVR_DONE_B;
		/* number of bytes to write */
		s->init_num=4;
		s->init_off=0;
		}

	/* SSL3_ST_CW_CLNT_HELLO_B */
	return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
	}

static int ssl3_send_server_key_exchange(s)
SSL *s;
	{
#ifndef NO_RSA
	unsigned char *q;
	int j,num;
	RSA *rsa;
	unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
#endif
#ifndef NO_DH
	DH *dh,*dhp;
#endif
	EVP_PKEY *pkey;
	unsigned char *p,*d;
	int al,i;
	unsigned long type;
	int n;
	CERT *cert;
	BIGNUM *r[4];
	int nr[4],kn;
	BUF_MEM *buf;
	EVP_MD_CTX md_ctx;

	if (s->state == SSL3_ST_SW_KEY_EXCH_A)
		{
		type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
		cert=s->session->cert;

		buf=s->init_buf;

		r[0]=r[1]=r[2]=r[3]=NULL;
		n=0;
#ifndef NO_RSA
		if (type & SSL_kRSA)
			{
			rsa=cert->rsa_tmp;
			if ((rsa == NULL) && (s->ctx->default_cert->rsa_tmp_cb != NULL))
				{
				rsa=s->ctx->default_cert->rsa_tmp_cb(s,
B
Ben Laurie 已提交
918 919
					!(s->s3->tmp.new_cipher->algorithms
					  &SSL_NOT_EXP));
920 921 922 923 924
				CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
				cert->rsa_tmp=rsa;
				}
			if (rsa == NULL)
				{
925
				al=SSL_AD_HANDSHAKE_FAILURE;
926 927 928 929 930 931 932 933 934 935 936 937 938 939 940
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
				goto f_err;
				}
			r[0]=rsa->n;
			r[1]=rsa->e;
			s->s3->tmp.use_rsa_tmp=1;
			}
		else
#endif
#ifndef NO_DH
			if (type & SSL_kEDH)
			{
			dhp=cert->dh_tmp;
			if ((dhp == NULL) && (cert->dh_tmp_cb != NULL))
				dhp=cert->dh_tmp_cb(s,
B
Ben Laurie 已提交
941 942
					!(s->s3->tmp.new_cipher->algorithms
					  &SSL_NOT_EXP));
943 944
			if (dhp == NULL)
				{
945
				al=SSL_AD_HANDSHAKE_FAILURE;
946 947 948 949 950 951 952 953 954 955
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
				goto f_err;
				}
			if ((dh=DHparams_dup(dhp)) == NULL)
				{
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
				goto err;
				}

			s->s3->tmp.dh=dh;
B
Ben Laurie 已提交
956 957 958
			if ((dhp->pub_key == NULL ||
			     dhp->priv_key == NULL ||
			     (s->options & SSL_OP_SINGLE_DH_USE)))
959
				{
B
Ben Laurie 已提交
960 961 962 963 964 965
				if(!DH_generate_key(dh))
				    {
				    SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
					   ERR_R_DH_LIB);
				    goto err;
				    }
966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
				}
			else
				{
				dh->pub_key=BN_dup(dhp->pub_key);
				dh->priv_key=BN_dup(dhp->priv_key);
				if ((dh->pub_key == NULL) ||
					(dh->priv_key == NULL))
					{
					SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
					goto err;
					}
				}
			r[0]=dh->p;
			r[1]=dh->g;
			r[2]=dh->pub_key;
			}
		else 
#endif
			{
985
			al=SSL_AD_HANDSHAKE_FAILURE;
986 987 988 989 990 991 992 993 994 995 996 997 998 999
			SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
			goto f_err;
			}
		for (i=0; r[i] != NULL; i++)
			{
			nr[i]=BN_num_bytes(r[i]);
			n+=2+nr[i];
			}

		if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
			{
			if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
				== NULL)
				{
1000
				al=SSL_AD_DECODE_ERROR;
1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037
				goto f_err;
				}
			kn=EVP_PKEY_size(pkey);
			}
		else
			{
			pkey=NULL;
			kn=0;
			}

		if (!BUF_MEM_grow(buf,n+4+kn))
			{
			SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
			goto err;
			}
		d=(unsigned char *)s->init_buf->data;
		p= &(d[4]);

		for (i=0; r[i] != NULL; i++)
			{
			s2n(nr[i],p);
			BN_bn2bin(r[i],p);
			p+=nr[i];
			}

		/* not anonymous */
		if (pkey != NULL)
			{
			/* n is the length of the params, they start at &(d[4])
			 * and p points to the space at the end. */
#ifndef NO_RSA
			if (pkey->type == EVP_PKEY_RSA)
				{
				q=md_buf;
				j=0;
				for (num=2; num > 0; num--)
					{
1038 1039
					EVP_DigestInit(&md_ctx,(num == 2)
						?s->ctx->md5:s->ctx->sha1);
1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080
					EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
					EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
					EVP_DigestUpdate(&md_ctx,&(d[4]),n);
					EVP_DigestFinal(&md_ctx,q,
						(unsigned int *)&i);
					q+=i;
					j+=i;
					}
				i=RSA_private_encrypt(j,md_buf,&(p[2]),
					pkey->pkey.rsa,RSA_PKCS1_PADDING);
				if (i <= 0)
					{
					SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
					goto err;
					}
				s2n(i,p);
				n+=i+2;
				}
			else
#endif
#if !defined(NO_DSA)
				if (pkey->type == EVP_PKEY_DSA)
				{
				/* lets do DSS */
				EVP_SignInit(&md_ctx,EVP_dss1());
				EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
				EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
				EVP_SignUpdate(&md_ctx,&(d[4]),n);
				if (!EVP_SignFinal(&md_ctx,&(p[2]),
					(unsigned int *)&i,pkey))
					{
					SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
					goto err;
					}
				s2n(i,p);
				n+=i+2;
				}
			else
#endif
				{
				/* Is this error check actually needed? */
1081
				al=SSL_AD_HANDSHAKE_FAILURE;
1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143
				SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
				goto f_err;
				}
			}

		*(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
		l2n3(n,d);

		/* we should now have things packed up, so lets send
		 * it off */
		s->init_num=n+4;
		s->init_off=0;
		}

	/* SSL3_ST_SW_KEY_EXCH_B */
	return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
f_err:
	ssl3_send_alert(s,SSL3_AL_FATAL,al);
err:
	return(-1);
	}

static int ssl3_send_certificate_request(s)
SSL *s;
	{
	unsigned char *p,*d;
	int i,j,nl,off,n;
	STACK *sk=NULL;
	X509_NAME *name;
	BUF_MEM *buf;

	if (s->state == SSL3_ST_SW_CERT_REQ_A)
		{
		buf=s->init_buf;

		d=p=(unsigned char *)&(buf->data[4]);

		/* get the list of acceptable cert types */
		p++;
		n=ssl3_get_req_cert_type(s,p);
		d[0]=n;
		p+=n;
		n++;

		off=n;
		p+=2;
		n+=2;

		sk=SSL_get_client_CA_list(s);
		nl=0;
		if (sk != NULL)
			{
			for (i=0; i<sk_num(sk); i++)
				{
				name=(X509_NAME *)sk_value(sk,i);
				j=i2d_X509_NAME(name,NULL);
				if (!BUF_MEM_grow(buf,4+n+j+2))
					{
					SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
					goto err;
					}
				p=(unsigned char *)&(buf->data[4+n]);
1144
				if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190
					{
					s2n(j,p);
					i2d_X509_NAME(name,&p);
					n+=2+j;
					nl+=2+j;
					}
				else
					{
					d=p;
					i2d_X509_NAME(name,&p);
					j-=2; s2n(j,d); j+=2;
					n+=j;
					nl+=j;
					}
				}
			}
		/* else no CA names */
		p=(unsigned char *)&(buf->data[4+off]);
		s2n(nl,p);

		d=(unsigned char *)buf->data;
		*(d++)=SSL3_MT_CERTIFICATE_REQUEST;
		l2n3(n,d);

		/* we should now have things packed up, so lets send
		 * it off */

		s->init_num=n+4;
		s->init_off=0;
		}

	/* SSL3_ST_SW_CERT_REQ_B */
	return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
err:
	return(-1);
	}

static int ssl3_get_client_key_exchange(s)
SSL *s;
	{
	int i,al,ok;
	long n;
	unsigned long l;
	unsigned char *p;
	RSA *rsa=NULL;
	EVP_PKEY *pkey=NULL;
1191 1192
#ifndef NO_DH
	BIGNUM *pub=NULL;
1193
	DH *dh_srvr;
1194
#endif
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223

	n=ssl3_get_message(s,
		SSL3_ST_SR_KEY_EXCH_A,
		SSL3_ST_SR_KEY_EXCH_B,
		SSL3_MT_CLIENT_KEY_EXCHANGE,
		400, /* ???? */
		&ok);

	if (!ok) return((int)n);
	p=(unsigned char *)s->init_buf->data;

	l=s->s3->tmp.new_cipher->algorithms;

#ifndef NO_RSA
	if (l & SSL_kRSA)
		{
		/* FIX THIS UP EAY EAY EAY EAY */
		if (s->s3->tmp.use_rsa_tmp)
			{
			if ((s->session->cert != NULL) &&
				(s->session->cert->rsa_tmp != NULL))
				rsa=s->session->cert->rsa_tmp;
			else if ((s->ctx->default_cert != NULL) &&
				(s->ctx->default_cert->rsa_tmp != NULL))
				rsa=s->ctx->default_cert->rsa_tmp;
			/* Don't do a callback because rsa_tmp should
			 * be sent already */
			if (rsa == NULL)
				{
1224
				al=SSL_AD_HANDSHAKE_FAILURE;
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
				goto f_err;

				}
			}
		else
			{
			pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
			if (	(pkey == NULL) ||
				(pkey->type != EVP_PKEY_RSA) ||
				(pkey->pkey.rsa == NULL))
				{
1237
				al=SSL_AD_HANDSHAKE_FAILURE;
1238 1239 1240 1241 1242 1243
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
				goto f_err;
				}
			rsa=pkey->pkey.rsa;
			}

1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
		/* TLS */
		if (s->version > SSL3_VERSION)
			{
			n2s(p,i);
			if (n != i+2)
				{
				if (!(s->options & SSL_OP_TLS_D5_BUG))
					{
					SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
					goto err;
					}
				else
					p-=2;
				}
			else
				n=i;
			}

1262
		i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1263

1264
#if 1
1265
		/* If a bad decrypt, use a random master key */
1266
		if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1267 1268
			((p[0] != (s->version>>8)) ||
			 (p[1] != (s->version & 0xff))))
1269
			{
1270 1271
			p[0]=(s->version>>8);
			p[1]=(s->version & 0xff);
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291
			RAND_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
			i=SSL_MAX_MASTER_KEY_LENGTH;
			}
#else
		if (i != SSL_MAX_MASTER_KEY_LENGTH)
			{
			al=SSL_AD_DECODE_ERROR;
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
			goto f_err;
			}

		if ((p[0] != (s->version>>8)) || (p[1] != (s->version & 0xff)))
			{
			al=SSL_AD_DECODE_ERROR;
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
			goto f_err;
			}
#endif

		s->session->master_key_length=
1292
			s->method->ssl3_enc->generate_master_secret(s,
1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304
				s->session->master_key,
				p,i);
		memset(p,0,i);
		}
	else
#endif
#ifndef NO_DH
		if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
		{
		n2s(p,i);
		if (n != i+2)
			{
1305
			if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318
				{
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
				goto err;
				}
			else
				{
				p-=2;
				i=(int)n;
				}
			}

		if (n == 0L) /* the parameters are in the cert */
			{
1319
			al=SSL_AD_HANDSHAKE_FAILURE;
1320 1321 1322 1323 1324 1325 1326
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
			goto f_err;
			}
		else
			{
			if (s->s3->tmp.dh == NULL)
				{
1327
				al=SSL_AD_HANDSHAKE_FAILURE;
1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
				goto f_err;
				}
			else
				dh_srvr=s->s3->tmp.dh;
			}

		pub=BN_bin2bn(p,i,NULL);
		if (pub == NULL)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
			goto err;
			}
1341

1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
		i=DH_compute_key(p,pub,dh_srvr);

		if (i <= 0)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
			goto err;
			}

		DH_free(s->s3->tmp.dh);
		s->s3->tmp.dh=NULL;

		BN_clear_free(pub);
		pub=NULL;
		s->session->master_key_length=
1356
			s->method->ssl3_enc->generate_master_secret(s,
1357 1358 1359 1360 1361
				s->session->master_key,p,i);
		}
	else
#endif
		{
1362
		al=SSL_AD_HANDSHAKE_FAILURE;
1363 1364 1365 1366 1367 1368 1369
		SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNKNOWN_CIPHER_TYPE);
		goto f_err;
		}

	return(1);
f_err:
	ssl3_send_alert(s,SSL3_AL_FATAL,al);
1370
#if !defined(NO_DH) || !defined(NO_RSA)
1371
err:
1372
#endif
1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411
	return(-1);
	}

static int ssl3_get_cert_verify(s)
SSL *s;
	{
	EVP_PKEY *pkey=NULL;
	unsigned char *p;
	int al,ok,ret=0;
	long n;
	int type=0,i,j;
	X509 *peer;

	n=ssl3_get_message(s,
		SSL3_ST_SR_CERT_VRFY_A,
		SSL3_ST_SR_CERT_VRFY_B,
		-1,
		512, /* 512? */
		&ok);

	if (!ok) return((int)n);

	if (s->session->peer != NULL)
		{
		peer=s->session->peer;
		pkey=X509_get_pubkey(peer);
		type=X509_certificate_type(peer,pkey);
		}
	else
		{
		peer=NULL;
		pkey=NULL;
		}

	if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
		{
		s->s3->tmp.reuse_message=1;
		if ((peer != NULL) && (type | EVP_PKT_SIGN))
			{
1412
			al=SSL_AD_UNEXPECTED_MESSAGE;
1413 1414 1415 1416 1417 1418 1419 1420 1421 1422
			SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
			goto f_err;
			}
		ret=1;
		goto end;
		}

	if (peer == NULL)
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
1423
		al=SSL_AD_UNEXPECTED_MESSAGE;
1424 1425 1426 1427 1428 1429
		goto f_err;
		}

	if (!(type & EVP_PKT_SIGN))
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1430
		al=SSL_AD_ILLEGAL_PARAMETER;
1431 1432 1433 1434 1435 1436
		goto f_err;
		}

	if (s->s3->change_cipher_spec)
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1437
		al=SSL_AD_UNEXPECTED_MESSAGE;
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
		goto f_err;
		}

	/* we now have a signature that we need to verify */
	p=(unsigned char *)s->init_buf->data;
	n2s(p,i);
	n-=2;
	if (i > n)
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
1448
		al=SSL_AD_DECODE_ERROR;
1449 1450 1451 1452 1453 1454 1455
		goto f_err;
		}

	j=EVP_PKEY_size(pkey);
	if ((i > j) || (n > j) || (n <= 0))
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
1456
		al=SSL_AD_DECODE_ERROR;
1457 1458 1459 1460 1461 1462 1463 1464 1465
		goto f_err;
		}

#ifndef NO_RSA 
	if (pkey->type == EVP_PKEY_RSA)
		{
		i=RSA_public_decrypt(i,p,p,pkey->pkey.rsa,RSA_PKCS1_PADDING);
		if (i < 0)
			{
1466
			al=SSL_AD_DECRYPT_ERROR;
1467 1468 1469 1470
			SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
			goto f_err;
			}
		if ((i != (MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH)) ||
1471 1472
			memcmp(&(s->s3->tmp.finish_md[0]),p,
				MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH))
1473
			{
1474
			al=SSL_AD_DECRYPT_ERROR;
1475 1476 1477 1478 1479 1480 1481 1482 1483
			SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
			goto f_err;
			}
		}
	else
#endif
#ifndef NO_DSA
		if (pkey->type == EVP_PKEY_DSA)
		{
1484 1485
		j=DSA_verify(pkey->save_type,
			&(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]),
1486 1487 1488 1489
			SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
		if (j <= 0)
			{
			/* bad signature */
1490
			al=SSL_AD_DECRYPT_ERROR;
1491 1492 1493 1494 1495 1496 1497 1498
			SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
			goto f_err;
			}
		}
	else
#endif
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_INTERNAL_ERROR);
1499
		al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541
		goto f_err;
		}


	ret=1;
	if (0)
		{
f_err:
		ssl3_send_alert(s,SSL3_AL_FATAL,al);
		}
end:
	return(ret);
	}

static int ssl3_get_client_certificate(s)
SSL *s;
	{
	int i,ok,al,ret= -1;
	X509 *x=NULL;
	unsigned long l,nc,llen,n;
	unsigned char *p,*d,*q;
	STACK *sk=NULL;

	n=ssl3_get_message(s,
		SSL3_ST_SR_CERT_A,
		SSL3_ST_SR_CERT_B,
		-1,
#if defined(MSDOS) && !defined(WIN32)
		1024*30, /* 30k max cert list :-) */
#else
		1024*100, /* 100k max cert list :-) */
#endif
		&ok);

	if (!ok) return((int)n);

	if	(s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
		{
		if (	(s->verify_mode & SSL_VERIFY_PEER) &&
			(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
1542 1543 1544 1545 1546 1547 1548 1549
			al=SSL_AD_HANDSHAKE_FAILURE;
			goto f_err;
			}
		/* If tls asked for a client cert we must return a 0 list */
		if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
			al=SSL_AD_UNEXPECTED_MESSAGE;
1550 1551 1552 1553 1554 1555 1556 1557
			goto f_err;
			}
		s->s3->tmp.reuse_message=1;
		return(1);
		}

	if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
		{
1558
		al=SSL_AD_UNEXPECTED_MESSAGE;
1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572
		SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
		goto f_err;
		}
	d=p=(unsigned char *)s->init_buf->data;

	if ((sk=sk_new_null()) == NULL)
		{
		SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
		goto err;
		}

	n2l3(p,llen);
	if (llen+3 != n)
		{
1573
		al=SSL_AD_DECODE_ERROR;
1574 1575 1576 1577 1578 1579 1580 1581
		SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
		goto f_err;
		}
	for (nc=0; nc<llen; )
		{
		n2l3(p,l);
		if ((l+nc+3) > llen)
			{
1582
			al=SSL_AD_DECODE_ERROR;
1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
			goto f_err;
			}

		q=p;
		x=d2i_X509(NULL,&p,l);
		if (x == NULL)
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
			goto err;
			}
		if (p != (q+l))
			{
1596
			al=SSL_AD_DECODE_ERROR;
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
			goto f_err;
			}
		if (!sk_push(sk,(char *)x))
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
			goto err;
			}
		x=NULL;
		nc+=l+3;
		}

	if (sk_num(sk) <= 0)
		{
1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625
		/* TLS does not mind 0 certs returned */
		if (s->version == SSL3_VERSION)
			{
			al=SSL_AD_HANDSHAKE_FAILURE;
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
			goto f_err;
			}
		/* Fail for TLS only if we required a certificate */
		else if ((s->verify_mode & SSL_VERIFY_PEER) &&
			 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
			{
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
			al=SSL_AD_HANDSHAKE_FAILURE;
			goto f_err;
			}
1626
		}
1627
	else
1628
		{
1629 1630 1631 1632 1633 1634 1635
		i=ssl_verify_cert_chain(s,sk);
		if (!i)
			{
			al=ssl_verify_alarm_type(s->verify_result);
			SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
			goto f_err;
			}
1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678
		}

	/* This should not be needed */
	if (s->session->peer != NULL)
		X509_free(s->session->peer);
	s->session->peer=(X509 *)sk_shift(sk);

	ret=1;
	if (0)
		{
f_err:
		ssl3_send_alert(s,SSL3_AL_FATAL,al);
		}
err:
	if (x != NULL) X509_free(x);
	if (sk != NULL) sk_pop_free(sk,X509_free);
	return(ret);
	}

int ssl3_send_server_certificate(s)
SSL *s;
	{
	unsigned long l;
	X509 *x;

	if (s->state == SSL3_ST_SW_CERT_A)
		{
		x=ssl_get_server_send_cert(s);
		if (x == NULL)
			{
			SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,SSL_R_INTERNAL_ERROR);
			return(0);
			}

		l=ssl3_output_cert_chain(s,x);
		s->state=SSL3_ST_SW_CERT_B;
		s->init_num=(int)l;
		s->init_off=0;
		}

	/* SSL3_ST_SW_CERT_B */
	return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
	}