mirror of
https://github.com/yuzu-emu/mbedtls.git
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1021 lines
29 KiB
C
1021 lines
29 KiB
C
/*
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* SSLv3/TLSv1 server-side functions
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*
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* Copyright (C) 2006-2010, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "polarssl/config.h"
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#if defined(POLARSSL_SSL_SRV_C)
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#include "polarssl/debug.h"
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#include "polarssl/ssl.h"
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#if defined(POLARSSL_PKCS11_C)
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#include "polarssl/pkcs11.h"
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#endif /* defined(POLARSSL_PKCS11_C) */
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#include <stdlib.h>
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#include <stdio.h>
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#include <time.h>
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static int ssl_parse_client_hello( ssl_context *ssl )
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{
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int ret;
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unsigned int i, j;
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size_t n;
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unsigned int ciph_len, sess_len;
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unsigned int chal_len, comp_len;
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unsigned char *buf, *p;
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SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) );
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if( ( ret = ssl_fetch_input( ssl, 5 ) ) != 0 )
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{
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SSL_DEBUG_RET( 1, "ssl_fetch_input", ret );
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return( ret );
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}
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buf = ssl->in_hdr;
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if( ( buf[0] & 0x80 ) != 0 )
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{
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SSL_DEBUG_BUF( 4, "record header", buf, 5 );
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SSL_DEBUG_MSG( 3, ( "client hello v2, message type: %d",
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buf[2] ) );
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SSL_DEBUG_MSG( 3, ( "client hello v2, message len.: %d",
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( ( buf[0] & 0x7F ) << 8 ) | buf[1] ) );
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SSL_DEBUG_MSG( 3, ( "client hello v2, max. version: [%d:%d]",
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buf[3], buf[4] ) );
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/*
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* SSLv2 Client Hello
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*
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* Record layer:
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* 0 . 1 message length
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*
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* SSL layer:
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* 2 . 2 message type
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* 3 . 4 protocol version
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*/
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if( buf[2] != SSL_HS_CLIENT_HELLO ||
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buf[3] != SSL_MAJOR_VERSION_3 )
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{
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SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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n = ( ( buf[0] << 8 ) | buf[1] ) & 0x7FFF;
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if( n < 17 || n > 512 )
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{
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SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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ssl->max_major_ver = buf[3];
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ssl->max_minor_ver = buf[4];
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ssl->major_ver = SSL_MAJOR_VERSION_3;
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ssl->minor_ver = ( buf[4] <= SSL_MINOR_VERSION_2 )
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? buf[4] : SSL_MINOR_VERSION_2;
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if( ( ret = ssl_fetch_input( ssl, 2 + n ) ) != 0 )
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{
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SSL_DEBUG_RET( 1, "ssl_fetch_input", ret );
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return( ret );
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}
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md5_update( &ssl->fin_md5 , buf + 2, n );
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sha1_update( &ssl->fin_sha1, buf + 2, n );
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buf = ssl->in_msg;
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n = ssl->in_left - 5;
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/*
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* 0 . 1 ciphersuitelist length
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* 2 . 3 session id length
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* 4 . 5 challenge length
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* 6 . .. ciphersuitelist
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* .. . .. session id
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* .. . .. challenge
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*/
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SSL_DEBUG_BUF( 4, "record contents", buf, n );
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ciph_len = ( buf[0] << 8 ) | buf[1];
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sess_len = ( buf[2] << 8 ) | buf[3];
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chal_len = ( buf[4] << 8 ) | buf[5];
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SSL_DEBUG_MSG( 3, ( "ciph_len: %d, sess_len: %d, chal_len: %d",
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ciph_len, sess_len, chal_len ) );
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/*
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* Make sure each parameter length is valid
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*/
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if( ciph_len < 3 || ( ciph_len % 3 ) != 0 )
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{
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SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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if( sess_len > 32 )
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{
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SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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if( chal_len < 8 || chal_len > 32 )
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{
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SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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if( n != 6 + ciph_len + sess_len + chal_len )
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{
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SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist",
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buf + 6, ciph_len );
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SSL_DEBUG_BUF( 3, "client hello, session id",
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buf + 6 + ciph_len, sess_len );
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SSL_DEBUG_BUF( 3, "client hello, challenge",
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buf + 6 + ciph_len + sess_len, chal_len );
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p = buf + 6 + ciph_len;
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ssl->session->length = sess_len;
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memset( ssl->session->id, 0, sizeof( ssl->session->id ) );
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memcpy( ssl->session->id, p, ssl->session->length );
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p += sess_len;
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memset( ssl->randbytes, 0, 64 );
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memcpy( ssl->randbytes + 32 - chal_len, p, chal_len );
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for( i = 0; ssl->ciphersuites[i] != 0; i++ )
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{
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for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 )
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{
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if( p[0] == 0 &&
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p[1] == 0 &&
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p[2] == ssl->ciphersuites[i] )
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goto have_ciphersuite;
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}
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}
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}
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else
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{
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SSL_DEBUG_BUF( 4, "record header", buf, 5 );
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SSL_DEBUG_MSG( 3, ( "client hello v3, message type: %d",
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buf[0] ) );
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SSL_DEBUG_MSG( 3, ( "client hello v3, message len.: %d",
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( buf[3] << 8 ) | buf[4] ) );
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SSL_DEBUG_MSG( 3, ( "client hello v3, protocol ver: [%d:%d]",
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buf[1], buf[2] ) );
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/*
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* SSLv3 Client Hello
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*
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* Record layer:
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* 0 . 0 message type
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* 1 . 2 protocol version
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* 3 . 4 message length
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*/
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if( buf[0] != SSL_MSG_HANDSHAKE ||
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buf[1] != SSL_MAJOR_VERSION_3 )
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{
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SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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n = ( buf[3] << 8 ) | buf[4];
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if( n < 45 || n > 512 )
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{
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SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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if( ( ret = ssl_fetch_input( ssl, 5 + n ) ) != 0 )
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{
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SSL_DEBUG_RET( 1, "ssl_fetch_input", ret );
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return( ret );
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}
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buf = ssl->in_msg;
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n = ssl->in_left - 5;
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md5_update( &ssl->fin_md5 , buf, n );
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sha1_update( &ssl->fin_sha1, buf, n );
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/*
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* SSL layer:
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* 0 . 0 handshake type
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* 1 . 3 handshake length
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* 4 . 5 protocol version
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* 6 . 9 UNIX time()
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* 10 . 37 random bytes
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* 38 . 38 session id length
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* 39 . 38+x session id
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* 39+x . 40+x ciphersuitelist length
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* 41+x . .. ciphersuitelist
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* .. . .. compression alg.
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* .. . .. extensions
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*/
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SSL_DEBUG_BUF( 4, "record contents", buf, n );
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SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d",
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buf[0] ) );
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SSL_DEBUG_MSG( 3, ( "client hello v3, handshake len.: %d",
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( buf[1] << 16 ) | ( buf[2] << 8 ) | buf[3] ) );
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SSL_DEBUG_MSG( 3, ( "client hello v3, max. version: [%d:%d]",
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buf[4], buf[5] ) );
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/*
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* Check the handshake type and protocol version
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*/
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if( buf[0] != SSL_HS_CLIENT_HELLO ||
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buf[4] != SSL_MAJOR_VERSION_3 )
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{
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SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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ssl->major_ver = SSL_MAJOR_VERSION_3;
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ssl->minor_ver = ( buf[5] <= SSL_MINOR_VERSION_2 )
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? buf[5] : SSL_MINOR_VERSION_2;
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ssl->max_major_ver = buf[4];
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ssl->max_minor_ver = buf[5];
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memcpy( ssl->randbytes, buf + 6, 32 );
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/*
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* Check the handshake message length
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*/
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if( buf[1] != 0 || n != (unsigned int) 4 + ( ( buf[2] << 8 ) | buf[3] ) )
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{
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SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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/*
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* Check the session length
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*/
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sess_len = buf[38];
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if( sess_len > 32 )
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{
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SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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ssl->session->length = sess_len;
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memset( ssl->session->id, 0, sizeof( ssl->session->id ) );
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memcpy( ssl->session->id, buf + 39 , ssl->session->length );
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/*
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* Check the ciphersuitelist length
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*/
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ciph_len = ( buf[39 + sess_len] << 8 )
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| ( buf[40 + sess_len] );
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if( ciph_len < 2 || ciph_len > 256 || ( ciph_len % 2 ) != 0 )
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{
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SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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/*
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* Check the compression algorithms length
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*/
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comp_len = buf[41 + sess_len + ciph_len];
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if( comp_len < 1 || comp_len > 16 )
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{
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SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
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}
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SSL_DEBUG_BUF( 3, "client hello, random bytes",
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buf + 6, 32 );
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SSL_DEBUG_BUF( 3, "client hello, session id",
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buf + 38, sess_len );
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SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist",
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buf + 41 + sess_len, ciph_len );
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SSL_DEBUG_BUF( 3, "client hello, compression",
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buf + 42 + sess_len + ciph_len, comp_len );
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/*
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* Search for a matching ciphersuite
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*/
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for( i = 0; ssl->ciphersuites[i] != 0; i++ )
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{
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for( j = 0, p = buf + 41 + sess_len; j < ciph_len;
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j += 2, p += 2 )
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{
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if( p[0] == 0 && p[1] == ssl->ciphersuites[i] )
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goto have_ciphersuite;
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}
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}
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}
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SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) );
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return( POLARSSL_ERR_SSL_NO_CIPHER_CHOSEN );
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have_ciphersuite:
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ssl->session->ciphersuite = ssl->ciphersuites[i];
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ssl->in_left = 0;
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ssl->state++;
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SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) );
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return( 0 );
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}
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static int ssl_write_server_hello( ssl_context *ssl )
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{
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time_t t;
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int ret, i, n;
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unsigned char *buf, *p;
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SSL_DEBUG_MSG( 2, ( "=> write server hello" ) );
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/*
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* 0 . 0 handshake type
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* 1 . 3 handshake length
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* 4 . 5 protocol version
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* 6 . 9 UNIX time()
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* 10 . 37 random bytes
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*/
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buf = ssl->out_msg;
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p = buf + 4;
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*p++ = (unsigned char) ssl->major_ver;
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*p++ = (unsigned char) ssl->minor_ver;
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SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]",
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buf[4], buf[5] ) );
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t = time( NULL );
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*p++ = (unsigned char)( t >> 24 );
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*p++ = (unsigned char)( t >> 16 );
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*p++ = (unsigned char)( t >> 8 );
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*p++ = (unsigned char)( t );
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SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) );
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for( i = 28; i > 0; i-- )
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*p++ = (unsigned char) ssl->f_rng( ssl->p_rng );
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memcpy( ssl->randbytes + 32, buf + 6, 32 );
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SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 );
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/*
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* 38 . 38 session id length
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* 39 . 38+n session id
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* 39+n . 40+n chosen ciphersuite
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* 41+n . 41+n chosen compression alg.
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*/
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ssl->session->length = n = 32;
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*p++ = (unsigned char) ssl->session->length;
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if( ssl->s_get == NULL ||
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ssl->s_get( ssl ) != 0 )
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{
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/*
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* Not found, create a new session id
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*/
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ssl->resume = 0;
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ssl->state++;
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for( i = 0; i < n; i++ )
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ssl->session->id[i] =
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(unsigned char) ssl->f_rng( ssl->p_rng );
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}
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else
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{
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/*
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* Found a matching session, resume it
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*/
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ssl->resume = 1;
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ssl->state = SSL_SERVER_CHANGE_CIPHER_SPEC;
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if( ( ret = ssl_derive_keys( ssl ) ) != 0 )
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{
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SSL_DEBUG_RET( 1, "ssl_derive_keys", ret );
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return( ret );
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}
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}
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memcpy( p, ssl->session->id, ssl->session->length );
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p += ssl->session->length;
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SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) );
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SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n );
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SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
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ssl->resume ? "a" : "no" ) );
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*p++ = (unsigned char)( ssl->session->ciphersuite >> 8 );
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*p++ = (unsigned char)( ssl->session->ciphersuite );
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*p++ = SSL_COMPRESS_NULL;
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SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %d",
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ssl->session->ciphersuite ) );
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SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", 0 ) );
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ssl->out_msglen = p - buf;
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ssl->out_msgtype = SSL_MSG_HANDSHAKE;
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ssl->out_msg[0] = SSL_HS_SERVER_HELLO;
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ret = ssl_write_record( ssl );
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SSL_DEBUG_MSG( 2, ( "<= write server hello" ) );
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return( ret );
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}
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static int ssl_write_certificate_request( ssl_context *ssl )
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{
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int ret;
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size_t n;
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unsigned char *buf, *p;
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const x509_cert *crt;
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SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
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ssl->state++;
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if( ssl->authmode == SSL_VERIFY_NONE )
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{
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SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
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return( 0 );
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}
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/*
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* 0 . 0 handshake type
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* 1 . 3 handshake length
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* 4 . 4 cert type count
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* 5 .. n-1 cert types
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* n .. n+1 length of all DNs
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* n+2 .. n+3 length of DN 1
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* n+4 .. ... Distinguished Name #1
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* ... .. ... length of DN 2, etc.
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*/
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buf = ssl->out_msg;
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p = buf + 4;
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/*
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* At the moment, only RSA certificates are supported
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*/
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*p++ = 1;
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*p++ = 1;
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p += 2;
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crt = ssl->ca_chain;
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while( crt != NULL )
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{
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if( p - buf > 4096 )
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break;
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n = crt->subject_raw.len;
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*p++ = (unsigned char)( n >> 8 );
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*p++ = (unsigned char)( n );
|
|
memcpy( p, crt->subject_raw.p, n );
|
|
|
|
SSL_DEBUG_BUF( 3, "requested DN", p, n );
|
|
p += n; crt = crt->next;
|
|
}
|
|
|
|
ssl->out_msglen = n = p - buf;
|
|
ssl->out_msgtype = SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = SSL_HS_CERTIFICATE_REQUEST;
|
|
ssl->out_msg[6] = (unsigned char)( ( n - 8 ) >> 8 );
|
|
ssl->out_msg[7] = (unsigned char)( ( n - 8 ) );
|
|
|
|
ret = ssl_write_record( ssl );
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
static int ssl_write_server_key_exchange( ssl_context *ssl )
|
|
{
|
|
#if defined(POLARSSL_DHM_C)
|
|
int ret;
|
|
size_t n, rsa_key_len = 0;
|
|
unsigned char hash[36];
|
|
md5_context md5;
|
|
sha1_context sha1;
|
|
#endif
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) );
|
|
|
|
if( ssl->session->ciphersuite != SSL_EDH_RSA_DES_168_SHA &&
|
|
ssl->session->ciphersuite != SSL_EDH_RSA_AES_128_SHA &&
|
|
ssl->session->ciphersuite != SSL_EDH_RSA_AES_256_SHA &&
|
|
ssl->session->ciphersuite != SSL_EDH_RSA_CAMELLIA_128_SHA &&
|
|
ssl->session->ciphersuite != SSL_EDH_RSA_CAMELLIA_256_SHA)
|
|
{
|
|
SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
#if !defined(POLARSSL_DHM_C)
|
|
SSL_DEBUG_MSG( 1, ( "support for dhm is not available" ) );
|
|
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
#else
|
|
|
|
if( ssl->rsa_key == NULL )
|
|
{
|
|
#if defined(POLARSSL_PKCS11_C)
|
|
if( ssl->pkcs11_key == NULL )
|
|
{
|
|
#endif /* defined(POLARSSL_PKCS11_C) */
|
|
SSL_DEBUG_MSG( 1, ( "got no private key" ) );
|
|
return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED );
|
|
#if defined(POLARSSL_PKCS11_C)
|
|
}
|
|
#endif /* defined(POLARSSL_PKCS11_C) */
|
|
}
|
|
|
|
/*
|
|
* Ephemeral DH parameters:
|
|
*
|
|
* struct {
|
|
* opaque dh_p<1..2^16-1>;
|
|
* opaque dh_g<1..2^16-1>;
|
|
* opaque dh_Ys<1..2^16-1>;
|
|
* } ServerDHParams;
|
|
*/
|
|
if( ( ret = dhm_make_params( &ssl->dhm_ctx, 256, ssl->out_msg + 4,
|
|
&n, ssl->f_rng, ssl->p_rng ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "dhm_make_params", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->dhm_ctx.X );
|
|
SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->dhm_ctx.P );
|
|
SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->dhm_ctx.G );
|
|
SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->dhm_ctx.GX );
|
|
|
|
/*
|
|
* digitally-signed struct {
|
|
* opaque md5_hash[16];
|
|
* opaque sha_hash[20];
|
|
* };
|
|
*
|
|
* md5_hash
|
|
* MD5(ClientHello.random + ServerHello.random
|
|
* + ServerParams);
|
|
* sha_hash
|
|
* SHA(ClientHello.random + ServerHello.random
|
|
* + ServerParams);
|
|
*/
|
|
md5_starts( &md5 );
|
|
md5_update( &md5, ssl->randbytes, 64 );
|
|
md5_update( &md5, ssl->out_msg + 4, n );
|
|
md5_finish( &md5, hash );
|
|
|
|
sha1_starts( &sha1 );
|
|
sha1_update( &sha1, ssl->randbytes, 64 );
|
|
sha1_update( &sha1, ssl->out_msg + 4, n );
|
|
sha1_finish( &sha1, hash + 16 );
|
|
|
|
SSL_DEBUG_BUF( 3, "parameters hash", hash, 36 );
|
|
|
|
if ( ssl->rsa_key )
|
|
rsa_key_len = ssl->rsa_key->len;
|
|
#if defined(POLARSSL_PKCS11_C)
|
|
else
|
|
rsa_key_len = ssl->pkcs11_key->len;
|
|
#endif /* defined(POLARSSL_PKCS11_C) */
|
|
|
|
ssl->out_msg[4 + n] = (unsigned char)( rsa_key_len >> 8 );
|
|
ssl->out_msg[5 + n] = (unsigned char)( rsa_key_len );
|
|
|
|
if ( ssl->rsa_key )
|
|
{
|
|
ret = rsa_pkcs1_sign( ssl->rsa_key, ssl->f_rng, ssl->p_rng,
|
|
RSA_PRIVATE,
|
|
SIG_RSA_RAW, 36, hash, ssl->out_msg + 6 + n );
|
|
}
|
|
#if defined(POLARSSL_PKCS11_C)
|
|
else {
|
|
ret = pkcs11_sign( ssl->pkcs11_key, RSA_PRIVATE,
|
|
SIG_RSA_RAW, 36, hash, ssl->out_msg + 6 + n );
|
|
}
|
|
#endif /* defined(POLARSSL_PKCS11_C) */
|
|
|
|
if( ret != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "pkcs1_sign", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_BUF( 3, "my RSA sig", ssl->out_msg + 6 + n, rsa_key_len );
|
|
|
|
ssl->out_msglen = 6 + n + rsa_key_len;
|
|
ssl->out_msgtype = SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = SSL_HS_SERVER_KEY_EXCHANGE;
|
|
|
|
ssl->state++;
|
|
|
|
if( ( ret = ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= write server key exchange" ) );
|
|
|
|
return( 0 );
|
|
#endif
|
|
}
|
|
|
|
static int ssl_write_server_hello_done( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> write server hello done" ) );
|
|
|
|
ssl->out_msglen = 4;
|
|
ssl->out_msgtype = SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = SSL_HS_SERVER_HELLO_DONE;
|
|
|
|
ssl->state++;
|
|
|
|
if( ( ret = ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= write server hello done" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ssl_parse_client_key_exchange( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
size_t i, n = 0;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) );
|
|
|
|
if( ( ret = ssl_read_record( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_read_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
|
|
if( ssl->in_msg[0] != SSL_HS_CLIENT_KEY_EXCHANGE )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
|
|
if( ssl->session->ciphersuite == SSL_EDH_RSA_DES_168_SHA ||
|
|
ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_SHA ||
|
|
ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_SHA ||
|
|
ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_128_SHA ||
|
|
ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_256_SHA)
|
|
{
|
|
#if !defined(POLARSSL_DHM_C)
|
|
SSL_DEBUG_MSG( 1, ( "support for dhm is not available" ) );
|
|
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
#else
|
|
/*
|
|
* Receive G^Y mod P, premaster = (G^Y)^X mod P
|
|
*/
|
|
n = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
|
|
|
|
if( n < 1 || n > ssl->dhm_ctx.len ||
|
|
n + 6 != ssl->in_hslen )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
|
|
if( ( ret = dhm_read_public( &ssl->dhm_ctx,
|
|
ssl->in_msg + 6, n ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "dhm_read_public", ret );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_DHM_RP );
|
|
}
|
|
|
|
SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->dhm_ctx.GY );
|
|
|
|
ssl->pmslen = ssl->dhm_ctx.len;
|
|
|
|
if( ( ret = dhm_calc_secret( &ssl->dhm_ctx,
|
|
ssl->premaster, &ssl->pmslen ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "dhm_calc_secret", ret );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_DHM_CS );
|
|
}
|
|
|
|
SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->dhm_ctx.K );
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
if( ssl->rsa_key == NULL )
|
|
{
|
|
#if defined(POLARSSL_PKCS11_C)
|
|
if( ssl->pkcs11_key == NULL )
|
|
{
|
|
#endif
|
|
SSL_DEBUG_MSG( 1, ( "got no private key" ) );
|
|
return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED );
|
|
#if defined(POLARSSL_PKCS11_C)
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Decrypt the premaster using own private RSA key
|
|
*/
|
|
i = 4;
|
|
if( ssl->rsa_key )
|
|
n = ssl->rsa_key->len;
|
|
#if defined(POLARSSL_PKCS11_C)
|
|
else
|
|
n = ssl->pkcs11_key->len;
|
|
#endif
|
|
ssl->pmslen = 48;
|
|
|
|
if( ssl->minor_ver != SSL_MINOR_VERSION_0 )
|
|
{
|
|
i += 2;
|
|
if( ssl->in_msg[4] != ( ( n >> 8 ) & 0xFF ) ||
|
|
ssl->in_msg[5] != ( ( n ) & 0xFF ) )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
}
|
|
|
|
if( ssl->in_hslen != i + n )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
|
|
}
|
|
|
|
if( ssl->rsa_key ) {
|
|
ret = rsa_pkcs1_decrypt( ssl->rsa_key, RSA_PRIVATE, &ssl->pmslen,
|
|
ssl->in_msg + i, ssl->premaster,
|
|
sizeof(ssl->premaster) );
|
|
}
|
|
#if defined(POLARSSL_PKCS11_C)
|
|
else {
|
|
ret = pkcs11_decrypt( ssl->pkcs11_key, RSA_PRIVATE, &ssl->pmslen,
|
|
ssl->in_msg + i, ssl->premaster,
|
|
sizeof(ssl->premaster) );
|
|
}
|
|
#endif /* defined(POLARSSL_PKCS11_C) */
|
|
|
|
if( ret != 0 || ssl->pmslen != 48 ||
|
|
ssl->premaster[0] != ssl->max_major_ver ||
|
|
ssl->premaster[1] != ssl->max_minor_ver )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
|
|
|
|
/*
|
|
* Protection against Bleichenbacher's attack:
|
|
* invalid PKCS#1 v1.5 padding must not cause
|
|
* the connection to end immediately; instead,
|
|
* send a bad_record_mac later in the handshake.
|
|
*/
|
|
ssl->pmslen = 48;
|
|
|
|
for( i = 0; i < ssl->pmslen; i++ )
|
|
ssl->premaster[i] = (unsigned char) ssl->f_rng( ssl->p_rng );
|
|
}
|
|
}
|
|
|
|
if( ( ret = ssl_derive_keys( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_derive_keys", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ssl->s_set != NULL )
|
|
ssl->s_set( ssl );
|
|
|
|
ssl->state++;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= parse client key exchange" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ssl_parse_certificate_verify( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
size_t n1, n2;
|
|
unsigned char hash[36];
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
|
|
|
|
if( ssl->peer_cert == NULL )
|
|
{
|
|
SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
ssl_calc_verify( ssl, hash );
|
|
|
|
if( ( ret = ssl_read_record( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_read_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
ssl->state++;
|
|
|
|
if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
|
|
}
|
|
|
|
if( ssl->in_msg[0] != SSL_HS_CERTIFICATE_VERIFY )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
|
|
}
|
|
|
|
n1 = ssl->peer_cert->rsa.len;
|
|
n2 = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
|
|
|
|
if( n1 + 6 != ssl->in_hslen || n1 != n2 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
|
|
}
|
|
|
|
ret = rsa_pkcs1_verify( &ssl->peer_cert->rsa, RSA_PUBLIC,
|
|
SIG_RSA_RAW, 36, hash, ssl->in_msg + 6 );
|
|
if( ret != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "rsa_pkcs1_verify", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* SSL handshake -- server side
|
|
*/
|
|
int ssl_handshake_server( ssl_context *ssl )
|
|
{
|
|
int ret = 0;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> handshake server" ) );
|
|
|
|
while( ssl->state != SSL_HANDSHAKE_OVER )
|
|
{
|
|
SSL_DEBUG_MSG( 2, ( "server state: %d", ssl->state ) );
|
|
|
|
if( ( ret = ssl_flush_output( ssl ) ) != 0 )
|
|
break;
|
|
|
|
switch( ssl->state )
|
|
{
|
|
case SSL_HELLO_REQUEST:
|
|
ssl->state = SSL_CLIENT_HELLO;
|
|
break;
|
|
|
|
/*
|
|
* <== ClientHello
|
|
*/
|
|
case SSL_CLIENT_HELLO:
|
|
ret = ssl_parse_client_hello( ssl );
|
|
break;
|
|
|
|
/*
|
|
* ==> ServerHello
|
|
* Certificate
|
|
* ( ServerKeyExchange )
|
|
* ( CertificateRequest )
|
|
* ServerHelloDone
|
|
*/
|
|
case SSL_SERVER_HELLO:
|
|
ret = ssl_write_server_hello( ssl );
|
|
break;
|
|
|
|
case SSL_SERVER_CERTIFICATE:
|
|
ret = ssl_write_certificate( ssl );
|
|
break;
|
|
|
|
case SSL_SERVER_KEY_EXCHANGE:
|
|
ret = ssl_write_server_key_exchange( ssl );
|
|
break;
|
|
|
|
case SSL_CERTIFICATE_REQUEST:
|
|
ret = ssl_write_certificate_request( ssl );
|
|
break;
|
|
|
|
case SSL_SERVER_HELLO_DONE:
|
|
ret = ssl_write_server_hello_done( ssl );
|
|
break;
|
|
|
|
/*
|
|
* <== ( Certificate/Alert )
|
|
* ClientKeyExchange
|
|
* ( CertificateVerify )
|
|
* ChangeCipherSpec
|
|
* Finished
|
|
*/
|
|
case SSL_CLIENT_CERTIFICATE:
|
|
ret = ssl_parse_certificate( ssl );
|
|
break;
|
|
|
|
case SSL_CLIENT_KEY_EXCHANGE:
|
|
ret = ssl_parse_client_key_exchange( ssl );
|
|
break;
|
|
|
|
case SSL_CERTIFICATE_VERIFY:
|
|
ret = ssl_parse_certificate_verify( ssl );
|
|
break;
|
|
|
|
case SSL_CLIENT_CHANGE_CIPHER_SPEC:
|
|
ret = ssl_parse_change_cipher_spec( ssl );
|
|
break;
|
|
|
|
case SSL_CLIENT_FINISHED:
|
|
ret = ssl_parse_finished( ssl );
|
|
break;
|
|
|
|
/*
|
|
* ==> ChangeCipherSpec
|
|
* Finished
|
|
*/
|
|
case SSL_SERVER_CHANGE_CIPHER_SPEC:
|
|
ret = ssl_write_change_cipher_spec( ssl );
|
|
break;
|
|
|
|
case SSL_SERVER_FINISHED:
|
|
ret = ssl_write_finished( ssl );
|
|
break;
|
|
|
|
case SSL_FLUSH_BUFFERS:
|
|
SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
|
|
ssl->state = SSL_HANDSHAKE_OVER;
|
|
break;
|
|
|
|
default:
|
|
SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
|
|
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
if( ret != 0 )
|
|
break;
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= handshake server" ) );
|
|
|
|
return( ret );
|
|
}
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|
|
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#endif
|