s3_both.c

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/* ssl/s3_both.c */
/* Copyright (C) 1995-1998 Eric Young ([e-mail])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([e-mail]).
 * 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 ([e-mail]).
 * 
 * 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 ([e-mail])"
 *    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 ([e-mail])"
 * 
 * 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.]
 */
/* ====================================================================
 * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
 *
 * 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 above 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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    [e-mail].
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * ([e-mail]).  This product includes software written by Tim
 * Hudson ([e-mail]).
 *
 */

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

/* send s->init_buf in records of type 'type' */
int ssl3_do_write(SSL *s, int type)
	{
	int ret;

	ret=ssl3_write_bytes(s,type,&s->init_buf->data[s->init_off],
	                     s->init_num);
	if (ret < 0) return(-1);
	if (type == SSL3_RT_HANDSHAKE)
		/* should not be done for 'Hello Request's, but in that case
		 * we'll ignore the result anyway */
		ssl3_finish_mac(s,(unsigned char *)&s->init_buf->data[s->init_off],ret);
	
	if (ret == s->init_num)
		return(1);
	s->init_off+=ret;
	s->init_num-=ret;
	return(0);
	}

int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
	{
	unsigned char *p,*d;
	int i;
	unsigned long l;

	if (s->state == a)
		{
		d=(unsigned char *)s->init_buf->data;
		p= &(d[4]);

		i=s->method->ssl3_enc->final_finish_mac(s,
			&(s->s3->finish_dgst1),
			&(s->s3->finish_dgst2),
			sender,slen,s->s3->tmp.finish_md);
		s->s3->tmp.finish_md_len = i;
		memcpy(p, s->s3->tmp.finish_md, i);
		p+=i;
		l=i;

#ifdef WIN16
		/* MSVC 1.5 does not clear the top bytes of the word unless
		 * I do this.
		 */
		l&=0xffff;
#endif

		*(d++)=SSL3_MT_FINISHED;
		l2n3(l,d);
		s->init_num=(int)l+4;
		s->init_off=0;

		s->state=b;
		}

	/* SSL3_ST_SEND_xxxxxx_HELLO_B */
	return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
	}

int ssl3_get_finished(SSL *s, int a, int b)
	{
	int al,i,ok;
	long n;
	unsigned char *p;

	/* the mac has already been generated when we received the
	 * change cipher spec message and is in s->s3->tmp.peer_finish_md
	 */ 

	n=ssl3_get_message(s,
		a,
		b,
		SSL3_MT_FINISHED,
		64, /* should actually be 36+4 :-) */
		&ok);

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

	/* If this occurs, we have missed a message */
	if (!s->s3->change_cipher_spec)
		{
		al=SSL_AD_UNEXPECTED_MESSAGE;
		SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
		goto f_err;
		}
	s->s3->change_cipher_spec=0;

	p = (unsigned char *)s->init_buf->data;
	i = s->s3->tmp.peer_finish_md_len;

	if (i != n)
		{
		al=SSL_AD_DECODE_ERROR;
		SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
		goto f_err;
		}

	if (memcmp(p, s->s3->tmp.peer_finish_md, i) != 0)
		{
		al=SSL_AD_DECRYPT_ERROR;
		SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
		goto f_err;
		}

	return(1);
f_err:
	ssl3_send_alert(s,SSL3_AL_FATAL,al);
	return(0);
	}

/* for these 2 messages, we need to
 * ssl->enc_read_ctx			re-init
 * ssl->s3->read_sequence		zero
 * ssl->s3->read_mac_secret		re-init
 * ssl->session->read_sym_enc		assign
 * ssl->session->read_compression	assign
 * ssl->session->read_hash		assign
 */
int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
	{ 
	unsigned char *p;

	if (s->state == a)
		{
		p=(unsigned char *)s->init_buf->data;
		*p=SSL3_MT_CCS;
		s->init_num=1;
		s->init_off=0;

		s->state=b;
		}

	/* SSL3_ST_CW_CHANGE_B */
	return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
	}

unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
	{
	unsigned char *p;
	int n,i;
	unsigned long l=7;
	BUF_MEM *buf;
	X509_STORE_CTX xs_ctx;
	X509_OBJECT obj;

	/* TLSv1 sends a chain with nothing in it, instead of an alert */
	buf=s->init_buf;
	if (!BUF_MEM_grow(buf,(int)(10)))
		{
		SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
		return(0);
		}
	if (x != NULL)
		{
		X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL);

		for (;;)
			{
			n=i2d_X509(x,NULL);
			if (!BUF_MEM_grow(buf,(int)(n+l+3)))
				{
				SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
				return(0);
				}
			p=(unsigned char *)&(buf->data[l]);
			l2n3(n,p);
			i2d_X509(x,&p);
			l+=n+3;
			if (X509_NAME_cmp(X509_get_subject_name(x),
				X509_get_issuer_name(x)) == 0) break;

			i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
				X509_get_issuer_name(x),&obj);
			if (i <= 0) break;
			x=obj.data.x509;