s3_srvr.c 37.8 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
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static SSL_METHOD *ssl3_get_server_method(int ver);
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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

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static SSL_METHOD *ssl3_get_server_method();
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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;
	int new_state,state,skip=0;

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	RAND_seed(&Time,sizeof(Time));
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	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:

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			s->server=1;
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			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->stats.sess_accept++;
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				}
			else
				{
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				s->ctx->stats.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:
			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 */
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			if (s->s3->tmp.use_rsa_tmp
			    || (l & (SSL_DH|SSL_kFZA))
			    || ((l & SSL_kRSA)
				&& (ct->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
				    || (SSL_IS_EXPORT(l)
					&& EVP_PKEY_size(ct->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_EXPORT_PKEYLENGTH(l)
					)
				    )
				)
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			    )
				{
				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 */
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			ssl_free_wbio_buffer(s);
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			s->new_session=0;
			s->init_num=0;

			ssl_update_cache(s,SSL_SESS_CACHE_SERVER);

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			s->ctx->stats.sess_accept_good++;
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			/* 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;
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	unsigned char *p,*d,*q;
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	SSL_CIPHER *c;
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	SSL_COMP *comp=NULL;
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	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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/*	s->client_version=(((int)p[0])<<8)|(int)p[1]; */
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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;
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		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;

643 644 645
#ifdef CIPHER_DEBUG
		printf("client sent %d ciphers\n",sk_num(ciphers));
#endif
646 647 648
		for (i=0; i<sk_num(ciphers); i++)
			{
			c=(SSL_CIPHER *)sk_value(ciphers,i);
649 650 651 652
#ifdef CIPHER_DEBUG
			printf("client [%2d of %2d]:%s\n",
				i,sk_num(ciphers),SSL_CIPHER_get_name(c));
#endif
653 654 655 656 657 658 659 660
			if (c->id == id)
				{
				j=1;
				break;
				}
			}
		if (j == 0)
			{
661
			if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_num(ciphers) == 1))
662 663 664 665 666 667 668 669 670
				{
				/* 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 */
671
				al=SSL_AD_ILLEGAL_PARAMETER;
672 673 674 675 676 677 678 679
				SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
				goto f_err;
				}
			}
		}

	/* compression */
	i= *(p++);
680
	q=p;
681
	for (j=0; j<i; j++)
682
		{
683
		if (p[j] == 0) break;
684
		}
685 686 687 688 689

	p+=i;
	if (j >= i)
		{
		/* no compress */
690
		al=SSL_AD_DECODE_ERROR;
691 692 693 694
		SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
		goto f_err;
		}

695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723
	/* Worst case, we will use the NULL compression, but if we have other
	 * options, we will now look for them.  We have i-1 compression
	 * algorithms from the client, starting at q. */
	s->s3->tmp.new_compression=NULL;
	if (s->ctx->comp_methods != NULL)
		{ /* See if we have a match */
		int m,nn,o,v,done=0;

		nn=sk_num(s->ctx->comp_methods);
		for (m=0; m<nn; m++)
			{
			comp=(SSL_COMP *)sk_value(s->ctx->comp_methods,m);
			v=comp->id;
			for (o=0; o<i; o++)
				{
				if (v == q[o])
					{
					done=1;
					break;
					}
				}
			if (done) break;
			}
		if (done)
			s->s3->tmp.new_compression=comp;
		else
			comp=NULL;
		}

724 725
	/* TLS does not mind if there is extra stuff */
	if (s->version == SSL3_VERSION)
726
		{
727 728 729 730 731 732 733 734
		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;
			}
735 736 737 738 739 740 741
		}

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

	if (!s->hit)
		{
742
		s->session->compress_meth=(comp == NULL)?0:comp->id;
743 744 745 746 747
		if (s->session->ciphers != NULL)
			sk_free(s->session->ciphers);
		s->session->ciphers=ciphers;
		if (ciphers == NULL)
			{
748
			al=SSL_AD_ILLEGAL_PARAMETER;
749 750 751 752 753 754 755 756 757
			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)
			{
758
			al=SSL_AD_HANDSHAKE_FAILURE;
759 760 761 762 763 764 765 766 767 768 769 770 771
			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;

772
		if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
773 774 775 776 777 778 779
			{
			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;
780
				if (SSL_C_IS_EXPORT(c))
781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
					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]);

835 836
		*(p++)=s->version>>8;
		*(p++)=s->version&0xff;
837 838 839 840 841 842 843 844 845 846 847

		/* 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
848
		 * 12-Jan-98 - I'll now support the '0' length stuff.
849
		 */
850 851
		if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
			s->session->session_id_length=0;
852 853 854 855 856 857 858 859 860 861 862

		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 */
863 864 865 866
		if (s->s3->tmp.new_compression == NULL)
			*(p++)=0;
		else
			*(p++)=s->s3->tmp.new_compression->id;
867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947

		/* 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,
948 949
				      !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
				      SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
950 951 952 953 954
				CRYPTO_add(&rsa->references,1,CRYPTO_LOCK_RSA);
				cert->rsa_tmp=rsa;
				}
			if (rsa == NULL)
				{
955
				al=SSL_AD_HANDSHAKE_FAILURE;
956 957 958 959 960 961 962 963 964 965 966 967 968 969 970
				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,
971 972
				      !SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
				      SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
973 974
			if (dhp == NULL)
				{
975
				al=SSL_AD_HANDSHAKE_FAILURE;
976 977 978 979 980 981 982 983 984 985
				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
986 987 988
			if ((dhp->pub_key == NULL ||
			     dhp->priv_key == NULL ||
			     (s->options & SSL_OP_SINGLE_DH_USE)))
989
				{
B
Ben Laurie 已提交
990 991 992 993 994 995
				if(!DH_generate_key(dh))
				    {
				    SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
					   ERR_R_DH_LIB);
				    goto err;
				    }
996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
				}
			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
			{
1015
			al=SSL_AD_HANDSHAKE_FAILURE;
1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
			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)
				{
1030
				al=SSL_AD_DECODE_ERROR;
1031 1032 1033 1034 1035 1036 1037 1038 1039 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
				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--)
					{
1068 1069
					EVP_DigestInit(&md_ctx,(num == 2)
						?s->ctx->md5:s->ctx->sha1);
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 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
					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? */
1111
				al=SSL_AD_HANDSHAKE_FAILURE;
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 1144 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
				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]);
1174
				if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 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
					{
					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;
1221 1222
#ifndef NO_DH
	BIGNUM *pub=NULL;
1223
	DH *dh_srvr;
1224
#endif
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253

	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)
				{
1254
				al=SSL_AD_HANDSHAKE_FAILURE;
1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266
				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))
				{
1267
				al=SSL_AD_HANDSHAKE_FAILURE;
1268 1269 1270 1271 1272 1273
				SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
				goto f_err;
				}
			rsa=pkey->pkey.rsa;
			}

1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291
		/* 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;
			}

1292
		i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1293

1294
#if 1
1295
		/* If a bad decrypt, use a random master key */
1296
		if ((i != SSL_MAX_MASTER_KEY_LENGTH) ||
1297 1298
			((p[0] != (s->client_version>>8)) ||
			 (p[1] != (s->client_version & 0xff))))
1299
			{
1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316
			int bad=1;

			if ((i == SSL_MAX_MASTER_KEY_LENGTH) &&
				(p[0] == (s->version>>8)) &&
				(p[1] == 0))
				{
				if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
					bad=0;
				}
			if (bad)
				{
				p[0]=(s->version>>8);
				p[1]=(s->version & 0xff);
				RAND_bytes(&(p[2]),SSL_MAX_MASTER_KEY_LENGTH-2);
				i=SSL_MAX_MASTER_KEY_LENGTH;
				}
			/* else, an SSLeay bug, ssl only server, tls client */
1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334
			}
#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=
1335
			s->method->ssl3_enc->generate_master_secret(s,
1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347
				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)
			{
1348
			if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361
				{
				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 */
			{
1362
			al=SSL_AD_HANDSHAKE_FAILURE;
1363 1364 1365 1366 1367 1368 1369
			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)
				{
1370
				al=SSL_AD_HANDSHAKE_FAILURE;
1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
				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;
			}
1384

1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398
		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=
1399
			s->method->ssl3_enc->generate_master_secret(s,
1400 1401 1402 1403 1404
				s->session->master_key,p,i);
		}
	else
#endif
		{
1405
		al=SSL_AD_HANDSHAKE_FAILURE;
1406 1407 1408 1409 1410 1411 1412
		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);
1413
#if !defined(NO_DH) || !defined(NO_RSA)
1414
err:
1415
#endif
1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454
	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))
			{
1455
			al=SSL_AD_UNEXPECTED_MESSAGE;
1456 1457 1458 1459 1460 1461 1462 1463 1464 1465
			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);
1466
		al=SSL_AD_UNEXPECTED_MESSAGE;
1467 1468 1469 1470 1471 1472
		goto f_err;
		}

	if (!(type & EVP_PKT_SIGN))
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
1473
		al=SSL_AD_ILLEGAL_PARAMETER;
1474 1475 1476 1477 1478 1479
		goto f_err;
		}

	if (s->s3->change_cipher_spec)
		{
		SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
1480
		al=SSL_AD_UNEXPECTED_MESSAGE;
1481 1482 1483 1484 1485 1486 1487 1488 1489 1490
		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);
1491
		al=SSL_AD_DECODE_ERROR;
1492 1493 1494 1495 1496 1497 1498
		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);
1499
		al=SSL_AD_DECODE_ERROR;
1500 1501 1502 1503 1504 1505 1506 1507 1508
		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)
			{
1509
			al=SSL_AD_DECRYPT_ERROR;
1510 1511 1512 1513
			SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
			goto f_err;
			}
		if ((i != (MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH)) ||
1514 1515
			memcmp(&(s->s3->tmp.finish_md[0]),p,
				MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH))
1516
			{
1517
			al=SSL_AD_DECRYPT_ERROR;
1518 1519 1520 1521 1522 1523 1524 1525 1526
			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)
		{
1527 1528
		j=DSA_verify(pkey->save_type,
			&(s->s3->tmp.finish_md[MD5_DIGEST_LENGTH]),
1529 1530 1531 1532
			SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
		if (j <= 0)
			{
			/* bad signature */
1533
			al=SSL_AD_DECRYPT_ERROR;
1534 1535 1536 1537 1538 1539 1540 1541
			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);
1542
		al=SSL_AD_UNSUPPORTED_CERTIFICATE;
1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553
		goto f_err;
		}


	ret=1;
	if (0)
		{
f_err:
		ssl3_send_alert(s,SSL3_AL_FATAL,al);
		}
end:
1554
	EVP_PKEY_free(pkey);
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585
	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);
1586 1587 1588 1589 1590 1591 1592 1593
			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;
1594 1595 1596 1597 1598 1599 1600 1601
			goto f_err;
			}
		s->s3->tmp.reuse_message=1;
		return(1);
		}

	if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
		{
1602
		al=SSL_AD_UNEXPECTED_MESSAGE;
1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616
		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)
		{
1617
		al=SSL_AD_DECODE_ERROR;
1618 1619 1620 1621 1622 1623 1624 1625
		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)
			{
1626
			al=SSL_AD_DECODE_ERROR;
1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639
			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))
			{
1640
			al=SSL_AD_DECODE_ERROR;
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654
			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)
		{
1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669
		/* 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;
			}
1670
		}
1671
	else
1672
		{
1673 1674 1675 1676 1677 1678 1679
		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;
			}
1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722
		}

	/* 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));
	}