/* ssl/s3_both.c */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * 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.]

 */

/* ====================================================================

 * Copyright (c) 1998-2002 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

 *    openssl-core@openssl.org.

 *

 * 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

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

/* ====================================================================

 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.

 * ECC cipher suite support in OpenSSL originally developed by 

 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.

 */

#include <limits.h>

#include <string.h>

#include <stdio.h>

#include "ssl_locl.h"

#include <openssl/buffer.h>

#include <openssl/rand.h>

#include <openssl/objects.h>

#include <openssl/evp.h>

#include <openssl/x509.h>

/* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */

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)

		{

		if (s->msg_callback)

			s->msg_callback(1, s->version, type, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg);

		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 OPENSSL_SYS_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=s->method->ssl_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_msg;

	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;

	int no_chain;

	if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || s->ctx->extra_certs)

		no_chain = 1;

	else

		no_chain = 0;

	/* TLSv1 sends a chain with nothing in it, instead of an alert */

	buf=s->init_buf;

	if (!BUF_MEM_grow_clean(buf,10))

		{

		SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);

		return(0);

		}

	if (x != NULL)

		{

		if(!no_chain && !X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL))

			{

			SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB);

			return(0);

			}

		for (;;)

			{

			n=i2d_X509(x,NULL);

			if (!BUF_MEM_grow_clean(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 (no_chain)

				break;

			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;

			/* Count is one too high since the X509_STORE_get uped the

			 * ref count */

			X509_free(x);

			}

		if (!no_chain)

			X509_STORE_CTX_cleanup(&xs_ctx);

		}

	/* Thawte special :-) */

	if (s->ctx->extra_certs != NULL)

	for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)

		{

		x=sk_X509_value(s->ctx->extra_certs,i);

		n=i2d_X509(x,NULL);

		if (!BUF_MEM_grow_clean(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;

		}

	l-=7;

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

	l2n3(l,p);

	l+=3;

	p=(unsigned char *)&(buf->data[0]);

	*(p++)=SSL3_MT_CERTIFICATE;

	l2n3(l,p);

	l+=4;

	return(l);

	}

/* Obtain handshake message of message type 'mt' (any if mt == -1),

 * maximum acceptable body length 'max'.

 * The first four bytes (msg_type and length) are read in state 'st1',

 * the body is read in state 'stn'.

 */

long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)

	{

	unsigned char *p;

	unsigned long l;

	long n;

	int i,al;

	if (s->s3->tmp.reuse_message)

		{

		s->s3->tmp.reuse_message=0;

		if ((mt >= 0) && (s->s3->tmp.message_type != mt))

			{

			al=SSL_AD_UNEXPECTED_MESSAGE;

			SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);

			goto f_err;

			}

		*ok=1;

		s->init_msg = s->init_buf->data + 4;

		s->init_num = (int)s->s3->tmp.message_size;

		return s->init_num;

		}

	p=(unsigned char *)s->init_buf->data;

	if (s->state == st1) /* s->init_num < 4 */

		{

		int skip_message;

		do

			{

			while (s->init_num < 4)

				{

				i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,

					&p[s->init_num],4 - s->init_num, 0);

				if (i <= 0)

					{

					s->rwstate=SSL_READING;

					*ok = 0;

					return i;

					}

				s->init_num+=i;

				}

			skip_message = 0;

			if (!s->server)

				if (p[0] == SSL3_MT_HELLO_REQUEST)

					/* The server may always send 'Hello Request' messages --

					 * we are doing a handshake anyway now, so ignore them

					 * if their format is correct. Does not count for

					 * 'Finished' MAC. */

					if (p[1] == 0 && p[2] == 0 &&p[3] == 0)

						{

						s->init_num = 0;

						skip_message = 1;

						if (s->msg_callback)

							s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, p, 4, s, s->msg_callback_arg);

						}

			}

		while (skip_message);

		/* s->init_num == 4 */

		if ((mt >= 0) && (*p != mt))

			{

			al=SSL_AD_UNEXPECTED_MESSAGE;

			SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);

			goto f_err;

			}

		if ((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&

					(st1 == SSL3_ST_SR_CERT_A) &&

					(stn == SSL3_ST_SR_CERT_B))

			{

			/* At this point we have got an MS SGC second client

			 * hello (maybe we should always allow the client to

			 * start a new handshake?). We need to restart the mac.

			 * Don't increment {num,total}_renegotiations because

			 * we have not completed the handshake. */

			ssl3_init_finished_mac(s);

			}

		s->s3->tmp.message_type= *(p++);

		n2l3(p,l);

		if (l > (unsigned long)max)

			{

			al=SSL_AD_ILLEGAL_PARAMETER;

			SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);

			goto f_err;

			}

		if (l > (INT_MAX-4)) /* BUF_MEM_grow takes an 'int' parameter */

			{

			al=SSL_AD_ILLEGAL_PARAMETER;

			SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);

			goto f_err;

			}

		if (l && !BUF_MEM_grow_clean(s->init_buf,(int)l+4))

			{

			SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);

			goto err;

			}

		s->s3->tmp.message_size=l;

		s->state=stn;

		s->init_msg = s->init_buf->data + 4;

		s->init_num = 0;

		}

	/* next state (stn) */

	p = s->init_msg;

	n = s->s3->tmp.message_size - s->init_num;

	while (n > 0)

		{

		i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n,0);

		if (i <= 0)

			{

			s->rwstate=SSL_READING;

			*ok = 0;

			return i;

			}

		s->init_num += i;

		n -= i;

		}

	ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + 4);

	if (s->msg_callback)

		s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, (size_t)s->init_num + 4, s, s->msg_callback_arg);

	*ok=1;

	return s->init_num;

f_err:

	ssl3_send_alert(s,SSL3_AL_FATAL,al);

err:

	*ok=0;

	return(-1);

	}

int ssl_cert_type(X509 *x, EVP_PKEY *pkey)

	{

	EVP_PKEY *pk;

	int ret= -1,i;

	if (pkey == NULL)

		pk=X509_get_pubkey(x);

	else

		pk=pkey;

	if (pk == NULL) goto err;

	i=pk->type;

	if (i == EVP_PKEY_RSA)

		{

		ret=SSL_PKEY_RSA_ENC;

		}

	else if (i == EVP_PKEY_DSA)

		{

		ret=SSL_PKEY_DSA_SIGN;

		}

#ifndef OPENSSL_NO_EC

	else if (i == EVP_PKEY_EC)

		{

		ret = SSL_PKEY_ECC;

		}

#endif

err:

	if(!pkey) EVP_PKEY_free(pk);

	return(ret);

	}