1515 lines
44 KiB
C
1515 lines
44 KiB
C
/*
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* SSLv3/TLSv1 client-side functions
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*
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* Copyright (C) 2006-2013, 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_CLI_C)
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#include "polarssl/debug.h"
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#include "polarssl/ssl.h"
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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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#if defined(POLARSSL_SHA4_C)
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#include "polarssl/sha4.h"
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#endif
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static int ssl_write_client_hello( ssl_context *ssl )
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{
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int ret;
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size_t i, n, ext_len = 0;
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unsigned char *buf;
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unsigned char *p;
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time_t t;
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unsigned char sig_alg_list[20];
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size_t sig_alg_len = 0;
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#if defined(POLARSSL_ECDH_C)
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unsigned char elliptic_curve_list[20];
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size_t elliptic_curve_len = 0;
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#endif
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SSL_DEBUG_MSG( 2, ( "=> write client hello" ) );
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if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE )
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{
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ssl->major_ver = ssl->min_major_ver;
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ssl->minor_ver = ssl->min_minor_ver;
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}
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if( ssl->max_major_ver == 0 && ssl->max_minor_ver == 0 )
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{
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ssl->max_major_ver = SSL_MAJOR_VERSION_3;
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ssl->max_minor_ver = SSL_MINOR_VERSION_3;
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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 . 5 highest version supported
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* 6 . 9 current 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->max_major_ver;
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*p++ = (unsigned char) ssl->max_minor_ver;
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SSL_DEBUG_MSG( 3, ( "client hello, max 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, ( "client hello, current time: %lu", t ) );
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if( ( ret = ssl->f_rng( ssl->p_rng, p, 28 ) ) != 0 )
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return( ret );
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p += 28;
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memcpy( ssl->handshake->randbytes, buf + 6, 32 );
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SSL_DEBUG_BUF( 3, "client hello, random bytes", buf + 6, 32 );
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/*
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* 38 . 38 session id length
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* 39 . 39+n session id
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* 40+n . 41+n ciphersuitelist length
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* 42+n . .. ciphersuitelist
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* .. . .. compression methods length
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* .. . .. compression methods
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* .. . .. extensions length
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* .. . .. extensions
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*/
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n = ssl->session_negotiate->length;
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if( ssl->renegotiation != SSL_INITIAL_HANDSHAKE || n < 16 || n > 32 ||
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ssl->handshake->resume == 0 )
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n = 0;
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*p++ = (unsigned char) n;
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for( i = 0; i < n; i++ )
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*p++ = ssl->session_negotiate->id[i];
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SSL_DEBUG_MSG( 3, ( "client hello, session id len.: %d", n ) );
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SSL_DEBUG_BUF( 3, "client hello, session id", buf + 39, n );
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for( n = 0; ssl->ciphersuites[n] != 0; n++ );
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if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE ) n++;
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*p++ = (unsigned char)( n >> 7 );
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*p++ = (unsigned char)( n << 1 );
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/*
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* Add TLS_EMPTY_RENEGOTIATION_INFO_SCSV
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*/
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if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE )
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{
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*p++ = (unsigned char)( SSL_EMPTY_RENEGOTIATION_INFO >> 8 );
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*p++ = (unsigned char)( SSL_EMPTY_RENEGOTIATION_INFO );
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n--;
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}
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SSL_DEBUG_MSG( 3, ( "client hello, got %d ciphersuites", n ) );
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for( i = 0; i < n; i++ )
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{
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SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %2d",
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ssl->ciphersuites[i] ) );
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*p++ = (unsigned char)( ssl->ciphersuites[i] >> 8 );
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*p++ = (unsigned char)( ssl->ciphersuites[i] );
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}
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#if defined(POLARSSL_ZLIB_SUPPORT)
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SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 2 ) );
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SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d %d",
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SSL_COMPRESS_DEFLATE, SSL_COMPRESS_NULL ) );
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*p++ = 2;
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*p++ = SSL_COMPRESS_DEFLATE;
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*p++ = SSL_COMPRESS_NULL;
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#else
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SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 1 ) );
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SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d", SSL_COMPRESS_NULL ) );
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*p++ = 1;
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*p++ = SSL_COMPRESS_NULL;
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#endif
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if ( ssl->hostname != NULL )
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{
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SSL_DEBUG_MSG( 3, ( "client hello, prepping for server name extension: %s",
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ssl->hostname ) );
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ext_len += ssl->hostname_len + 9;
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}
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if( ssl->renegotiation == SSL_RENEGOTIATION )
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{
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SSL_DEBUG_MSG( 3, ( "client hello, prepping for renegotiation extension" ) );
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ext_len += 5 + ssl->verify_data_len;
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}
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/*
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* Prepare signature_algorithms extension (TLS 1.2)
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*/
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if( ssl->max_minor_ver == SSL_MINOR_VERSION_3 )
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{
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#if defined(POLARSSL_SHA4_C)
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sig_alg_list[sig_alg_len++] = SSL_HASH_SHA512;
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sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
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sig_alg_list[sig_alg_len++] = SSL_HASH_SHA384;
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sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
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#endif
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#if defined(POLARSSL_SHA2_C)
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sig_alg_list[sig_alg_len++] = SSL_HASH_SHA256;
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sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
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sig_alg_list[sig_alg_len++] = SSL_HASH_SHA224;
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sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
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#endif
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#if defined(POLARSSL_SHA1_C)
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sig_alg_list[sig_alg_len++] = SSL_HASH_SHA1;
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sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
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#endif
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#if defined(POLARSSL_MD5_C)
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sig_alg_list[sig_alg_len++] = SSL_HASH_MD5;
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sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
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#endif
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ext_len += 6 + sig_alg_len;
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}
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#if defined(POLARSSL_ECDH_C)
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SSL_DEBUG_MSG( 3, ( "client hello, prepping for supported elliptic curves extension" ) );
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elliptic_curve_list[elliptic_curve_len++] = 0x00;
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elliptic_curve_list[elliptic_curve_len++] = POLARSSL_ECP_DP_SECP521R1;
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elliptic_curve_list[elliptic_curve_len++] = 0x00;
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elliptic_curve_list[elliptic_curve_len++] = POLARSSL_ECP_DP_SECP384R1;
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elliptic_curve_list[elliptic_curve_len++] = 0x00;
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elliptic_curve_list[elliptic_curve_len++] = POLARSSL_ECP_DP_SECP256R1;
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elliptic_curve_list[elliptic_curve_len++] = 0x00;
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elliptic_curve_list[elliptic_curve_len++] = POLARSSL_ECP_DP_SECP224R1;
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elliptic_curve_list[elliptic_curve_len++] = 0x00;
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elliptic_curve_list[elliptic_curve_len++] = POLARSSL_ECP_DP_SECP192R1;
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ext_len += 6 + elliptic_curve_len;
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SSL_DEBUG_MSG( 3, ( "client hello, prepping for supported point formats extension" ) );
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ext_len += 7;
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#endif
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SSL_DEBUG_MSG( 3, ( "client hello, total extension length: %d",
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ext_len ) );
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*p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
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*p++ = (unsigned char)( ( ext_len ) & 0xFF );
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if ( ssl->hostname != NULL )
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{
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/*
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* struct {
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* NameType name_type;
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* select (name_type) {
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* case host_name: HostName;
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* } name;
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* } ServerName;
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*
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* enum {
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* host_name(0), (255)
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* } NameType;
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*
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* opaque HostName<1..2^16-1>;
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*
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* struct {
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* ServerName server_name_list<1..2^16-1>
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* } ServerNameList;
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*/
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SSL_DEBUG_MSG( 3, ( "client hello, adding server name extension: %s",
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ssl->hostname ) );
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*p++ = (unsigned char)( ( TLS_EXT_SERVERNAME >> 8 ) & 0xFF );
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*p++ = (unsigned char)( ( TLS_EXT_SERVERNAME ) & 0xFF );
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*p++ = (unsigned char)( ( (ssl->hostname_len + 5) >> 8 ) & 0xFF );
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*p++ = (unsigned char)( ( (ssl->hostname_len + 5) ) & 0xFF );
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*p++ = (unsigned char)( ( (ssl->hostname_len + 3) >> 8 ) & 0xFF );
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*p++ = (unsigned char)( ( (ssl->hostname_len + 3) ) & 0xFF );
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*p++ = (unsigned char)( ( TLS_EXT_SERVERNAME_HOSTNAME ) & 0xFF );
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*p++ = (unsigned char)( ( ssl->hostname_len >> 8 ) & 0xFF );
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*p++ = (unsigned char)( ( ssl->hostname_len ) & 0xFF );
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memcpy( p, ssl->hostname, ssl->hostname_len );
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p += ssl->hostname_len;
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}
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if( ssl->renegotiation == SSL_RENEGOTIATION )
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{
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/*
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* Secure renegotiation
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*/
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SSL_DEBUG_MSG( 3, ( "client hello, renegotiation info extension" ) );
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*p++ = (unsigned char)( ( TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF );
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*p++ = (unsigned char)( ( TLS_EXT_RENEGOTIATION_INFO ) & 0xFF );
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*p++ = 0x00;
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*p++ = ( ssl->verify_data_len + 1 ) & 0xFF;
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*p++ = ssl->verify_data_len & 0xFF;
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memcpy( p, ssl->own_verify_data, ssl->verify_data_len );
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p += ssl->verify_data_len;
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}
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if( ssl->max_minor_ver == SSL_MINOR_VERSION_3 )
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{
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/*
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* enum {
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* none(0), md5(1), sha1(2), sha224(3), sha256(4), sha384(5),
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* sha512(6), (255)
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* } HashAlgorithm;
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*
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* enum { anonymous(0), rsa(1), dsa(2), ecdsa(3), (255) }
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* SignatureAlgorithm;
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*
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* struct {
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* HashAlgorithm hash;
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* SignatureAlgorithm signature;
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* } SignatureAndHashAlgorithm;
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*
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* SignatureAndHashAlgorithm
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* supported_signature_algorithms<2..2^16-2>;
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*/
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SSL_DEBUG_MSG( 3, ( "client hello, adding signature_algorithms extension" ) );
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*p++ = (unsigned char)( ( TLS_EXT_SIG_ALG >> 8 ) & 0xFF );
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*p++ = (unsigned char)( ( TLS_EXT_SIG_ALG ) & 0xFF );
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*p++ = (unsigned char)( ( ( sig_alg_len + 2 ) >> 8 ) & 0xFF );
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*p++ = (unsigned char)( ( ( sig_alg_len + 2 ) ) & 0xFF );
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*p++ = (unsigned char)( ( sig_alg_len >> 8 ) & 0xFF );
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*p++ = (unsigned char)( ( sig_alg_len ) & 0xFF );
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memcpy( p, sig_alg_list, sig_alg_len );
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p += sig_alg_len;
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}
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#if defined(POLARSSL_ECDH_C)
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SSL_DEBUG_MSG( 3, ( "client hello, adding supported_elliptic_curves extension" ) );
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*p++ = (unsigned char)( ( TLS_EXT_SUPPORTED_ELLIPTIC_CURVES >> 8 ) & 0xFF );
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*p++ = (unsigned char)( ( TLS_EXT_SUPPORTED_ELLIPTIC_CURVES ) & 0xFF );
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*p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) >> 8 ) & 0xFF );
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*p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) ) & 0xFF );
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*p++ = (unsigned char)( ( ( elliptic_curve_len ) >> 8 ) & 0xFF );
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*p++ = (unsigned char)( ( ( elliptic_curve_len ) ) & 0xFF );
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memcpy( p, elliptic_curve_list, elliptic_curve_len );
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p+= elliptic_curve_len;
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SSL_DEBUG_MSG( 3, ( "client hello, adding supported_point_formats extension" ) );
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*p++ = (unsigned char)( ( TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF );
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*p++ = (unsigned char)( ( TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF );
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*p++ = 0x00;
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*p++ = 3;
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*p++ = 2;
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*p++ = POLARSSL_ECP_PF_COMPRESSED;
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*p++ = POLARSSL_ECP_PF_UNCOMPRESSED;
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#endif
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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_CLIENT_HELLO;
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ssl->state++;
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if( ( ret = ssl_write_record( ssl ) ) != 0 )
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{
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SSL_DEBUG_RET( 1, "ssl_write_record", ret );
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return( ret );
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}
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SSL_DEBUG_MSG( 2, ( "<= write client hello" ) );
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return( 0 );
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}
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static int ssl_parse_renegotiation_info( ssl_context *ssl,
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unsigned char *buf,
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size_t len )
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{
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int ret;
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if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE )
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{
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if( len != 1 || buf[0] != 0x0 )
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{
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SSL_DEBUG_MSG( 1, ( "non-zero length renegotiated connection field" ) );
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if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
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return( ret );
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return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
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}
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ssl->secure_renegotiation = SSL_SECURE_RENEGOTIATION;
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}
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else
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{
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if( len != 1 + ssl->verify_data_len * 2 ||
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buf[0] != ssl->verify_data_len * 2 ||
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memcmp( buf + 1, ssl->own_verify_data, ssl->verify_data_len ) != 0 ||
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memcmp( buf + 1 + ssl->verify_data_len,
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ssl->peer_verify_data, ssl->verify_data_len ) != 0 )
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{
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SSL_DEBUG_MSG( 1, ( "non-matching renegotiated connection field" ) );
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if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
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return( ret );
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return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
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}
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}
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return( 0 );
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}
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static int ssl_parse_server_hello( ssl_context *ssl )
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{
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#if defined(POLARSSL_DEBUG_C)
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time_t t;
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#endif
|
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int ret, i, comp;
|
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size_t n;
|
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size_t ext_len = 0;
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unsigned char *buf, *ext;
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int renegotiation_info_seen = 0;
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int handshake_failure = 0;
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SSL_DEBUG_MSG( 2, ( "=> parse server hello" ) );
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|
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/*
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|
* 0 . 0 handshake type
|
|
* 1 . 3 handshake length
|
|
* 4 . 5 protocol version
|
|
* 6 . 9 UNIX time()
|
|
* 10 . 37 random bytes
|
|
*/
|
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buf = ssl->in_msg;
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if( ( ret = ssl_read_record( ssl ) ) != 0 )
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{
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SSL_DEBUG_RET( 1, "ssl_read_record", ret );
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return( ret );
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}
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|
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if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
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{
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SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
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return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
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}
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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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if( ssl->in_hslen < 42 ||
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buf[0] != SSL_HS_SERVER_HELLO ||
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buf[4] != SSL_MAJOR_VERSION_3 )
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{
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SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
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}
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if( buf[5] > ssl->max_minor_ver )
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{
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SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
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return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
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}
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|
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ssl->minor_ver = buf[5];
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|
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if( ssl->minor_ver < ssl->min_minor_ver )
|
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{
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SSL_DEBUG_MSG( 1, ( "server only supports ssl smaller than minimum"
|
|
" [%d:%d] < [%d:%d]", ssl->major_ver, ssl->minor_ver,
|
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buf[4], buf[5] ) );
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|
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ssl_send_alert_message( ssl, SSL_ALERT_LEVEL_FATAL,
|
|
SSL_ALERT_MSG_PROTOCOL_VERSION );
|
|
|
|
return( POLARSSL_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
|
|
}
|
|
|
|
#if defined(POLARSSL_DEBUG_C)
|
|
t = ( (time_t) buf[6] << 24 )
|
|
| ( (time_t) buf[7] << 16 )
|
|
| ( (time_t) buf[8] << 8 )
|
|
| ( (time_t) buf[9] );
|
|
#endif
|
|
|
|
memcpy( ssl->handshake->randbytes + 32, buf + 6, 32 );
|
|
|
|
n = buf[38];
|
|
|
|
SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) );
|
|
SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 );
|
|
|
|
if( n > 32 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
|
|
}
|
|
|
|
/*
|
|
* 38 . 38 session id length
|
|
* 39 . 38+n session id
|
|
* 39+n . 40+n chosen ciphersuite
|
|
* 41+n . 41+n chosen compression alg.
|
|
* 42+n . 43+n extensions length
|
|
* 44+n . 44+n+m extensions
|
|
*/
|
|
if( ssl->in_hslen > 42 + n )
|
|
{
|
|
ext_len = ( ( buf[42 + n] << 8 )
|
|
| ( buf[43 + n] ) );
|
|
|
|
if( ( ext_len > 0 && ext_len < 4 ) ||
|
|
ssl->in_hslen != 44 + n + ext_len )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
|
|
}
|
|
}
|
|
|
|
i = ( buf[39 + n] << 8 ) | buf[40 + n];
|
|
comp = buf[41 + n];
|
|
|
|
/*
|
|
* Initialize update checksum functions
|
|
*/
|
|
ssl->transform_negotiate->ciphersuite_info = ssl_ciphersuite_from_id( i );
|
|
ssl_optimize_checksum( ssl, ssl->transform_negotiate->ciphersuite_info );
|
|
|
|
if( ssl->transform_negotiate->ciphersuite_info == NULL )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "ciphersuite info for %02x not found",
|
|
ssl->ciphersuites[i] ) );
|
|
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) );
|
|
SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n );
|
|
|
|
/*
|
|
* Check if the session can be resumed
|
|
*/
|
|
if( ssl->renegotiation != SSL_INITIAL_HANDSHAKE ||
|
|
ssl->handshake->resume == 0 || n == 0 ||
|
|
ssl->session_negotiate->ciphersuite != i ||
|
|
ssl->session_negotiate->compression != comp ||
|
|
ssl->session_negotiate->length != n ||
|
|
memcmp( ssl->session_negotiate->id, buf + 39, n ) != 0 )
|
|
{
|
|
ssl->state++;
|
|
ssl->handshake->resume = 0;
|
|
ssl->session_negotiate->start = time( NULL );
|
|
ssl->session_negotiate->ciphersuite = i;
|
|
ssl->session_negotiate->compression = comp;
|
|
ssl->session_negotiate->length = n;
|
|
memcpy( ssl->session_negotiate->id, buf + 39, n );
|
|
}
|
|
else
|
|
{
|
|
ssl->state = SSL_SERVER_CHANGE_CIPHER_SPEC;
|
|
|
|
if( ( ret = ssl_derive_keys( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_derive_keys", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
|
|
ssl->handshake->resume ? "a" : "no" ) );
|
|
|
|
SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %d", i ) );
|
|
SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", buf[41 + n] ) );
|
|
|
|
i = 0;
|
|
while( 1 )
|
|
{
|
|
if( ssl->ciphersuites[i] == 0 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
|
|
}
|
|
|
|
if( ssl->ciphersuites[i++] == ssl->session_negotiate->ciphersuite )
|
|
break;
|
|
}
|
|
|
|
if( comp != SSL_COMPRESS_NULL
|
|
#if defined(POLARSSL_ZLIB_SUPPORT)
|
|
&& comp != SSL_COMPRESS_DEFLATE
|
|
#endif
|
|
)
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
|
|
}
|
|
ssl->session_negotiate->compression = comp;
|
|
|
|
ext = buf + 44 + n;
|
|
|
|
while( ext_len )
|
|
{
|
|
unsigned int ext_id = ( ( ext[0] << 8 )
|
|
| ( ext[1] ) );
|
|
unsigned int ext_size = ( ( ext[2] << 8 )
|
|
| ( ext[3] ) );
|
|
|
|
if( ext_size + 4 > ext_len )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
|
|
}
|
|
|
|
switch( ext_id )
|
|
{
|
|
case TLS_EXT_RENEGOTIATION_INFO:
|
|
SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) );
|
|
renegotiation_info_seen = 1;
|
|
|
|
if( ( ret = ssl_parse_renegotiation_info( ssl, ext + 4, ext_size ) ) != 0 )
|
|
return( ret );
|
|
|
|
break;
|
|
|
|
default:
|
|
SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)",
|
|
ext_id ) );
|
|
}
|
|
|
|
ext_len -= 4 + ext_size;
|
|
ext += 4 + ext_size;
|
|
|
|
if( ext_len > 0 && ext_len < 4 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Renegotiation security checks
|
|
*/
|
|
if( ssl->secure_renegotiation == SSL_LEGACY_RENEGOTIATION &&
|
|
ssl->allow_legacy_renegotiation == SSL_LEGACY_BREAK_HANDSHAKE )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) );
|
|
handshake_failure = 1;
|
|
}
|
|
else if( ssl->renegotiation == SSL_RENEGOTIATION &&
|
|
ssl->secure_renegotiation == SSL_SECURE_RENEGOTIATION &&
|
|
renegotiation_info_seen == 0 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "renegotiation_info extension missing (secure)" ) );
|
|
handshake_failure = 1;
|
|
}
|
|
else if( ssl->renegotiation == SSL_RENEGOTIATION &&
|
|
ssl->secure_renegotiation == SSL_LEGACY_RENEGOTIATION &&
|
|
ssl->allow_legacy_renegotiation == SSL_LEGACY_NO_RENEGOTIATION )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) );
|
|
handshake_failure = 1;
|
|
}
|
|
else if( ssl->renegotiation == SSL_RENEGOTIATION &&
|
|
ssl->secure_renegotiation == SSL_LEGACY_RENEGOTIATION &&
|
|
renegotiation_info_seen == 1 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "renegotiation_info extension present (legacy)" ) );
|
|
handshake_failure = 1;
|
|
}
|
|
|
|
if( handshake_failure == 1 )
|
|
{
|
|
if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
|
|
return( ret );
|
|
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#if !defined(POLARSSL_DHM_C) && !defined(POLARSSL_ECDH_C)
|
|
static int ssl_parse_server_key_exchange( ssl_context *ssl )
|
|
{
|
|
SSL_DEBUG_MSG( 2, ( "=> parse server key exchange" ) );
|
|
SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
#else
|
|
static int ssl_parse_server_key_exchange( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
size_t n;
|
|
unsigned char *p, *end;
|
|
unsigned char hash[64];
|
|
md5_context md5;
|
|
sha1_context sha1;
|
|
int hash_id = SIG_RSA_RAW;
|
|
unsigned int hashlen = 0;
|
|
|
|
const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> parse server key exchange" ) );
|
|
|
|
if( ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_DHE_RSA &&
|
|
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_ECDHE_RSA )
|
|
{
|
|
SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
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 server key exchange message" ) );
|
|
return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
|
|
if( ssl->in_msg[0] != SSL_HS_SERVER_KEY_EXCHANGE )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
|
|
}
|
|
|
|
SSL_DEBUG_BUF( 3, "server key exchange", ssl->in_msg + 4, ssl->in_hslen - 4 );
|
|
|
|
#if defined(POLARSSL_DHM_C)
|
|
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_RSA )
|
|
{
|
|
/*
|
|
* 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;
|
|
*/
|
|
p = ssl->in_msg + 4;
|
|
end = ssl->in_msg + ssl->in_hslen;
|
|
|
|
if( ( ret = dhm_read_params( &ssl->handshake->dhm_ctx, &p, end ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_MSG( 2, ( "DHM Read Params returned -0x%x", -ret ) );
|
|
SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
|
|
}
|
|
}
|
|
#endif /* POLARSSL_DHM_C */
|
|
|
|
#if defined(POLARSSL_ECDH_C)
|
|
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_RSA )
|
|
{
|
|
/*
|
|
* Ephemeral ECDH parameters:
|
|
*
|
|
* struct {
|
|
* ECParameters curve_params;
|
|
* ECPoint public;
|
|
* } ServerECDHParams;
|
|
*/
|
|
ecdh_init( &ssl->handshake->ecdh_ctx );
|
|
|
|
p = ssl->in_msg + 4;
|
|
end = ssl->in_msg + ssl->in_hslen;
|
|
|
|
if( ( ret = ecdh_read_params( &ssl->handshake->ecdh_ctx,
|
|
(const unsigned char **) &p, end ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_MSG( 2, ( "ECDH Read Params returned -0x%x", -ret ) );
|
|
SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
|
|
}
|
|
}
|
|
#endif /* POLARSSL_ECDH_C */
|
|
|
|
if( ssl->minor_ver == SSL_MINOR_VERSION_3 )
|
|
{
|
|
if( p[1] != SSL_SIG_RSA )
|
|
{
|
|
SSL_DEBUG_MSG( 2, ( "server used unsupported SignatureAlgorithm %d", p[1] ) );
|
|
SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
|
|
}
|
|
|
|
switch( p[0] )
|
|
{
|
|
#if defined(POLARSSL_MD5_C)
|
|
case SSL_HASH_MD5:
|
|
hash_id = SIG_RSA_MD5;
|
|
break;
|
|
#endif
|
|
#if defined(POLARSSL_SHA1_C)
|
|
case SSL_HASH_SHA1:
|
|
hash_id = SIG_RSA_SHA1;
|
|
break;
|
|
#endif
|
|
#if defined(POLARSSL_SHA2_C)
|
|
case SSL_HASH_SHA224:
|
|
hash_id = SIG_RSA_SHA224;
|
|
break;
|
|
case SSL_HASH_SHA256:
|
|
hash_id = SIG_RSA_SHA256;
|
|
break;
|
|
#endif
|
|
#if defined(POLARSSL_SHA4_C)
|
|
case SSL_HASH_SHA384:
|
|
hash_id = SIG_RSA_SHA384;
|
|
break;
|
|
case SSL_HASH_SHA512:
|
|
hash_id = SIG_RSA_SHA512;
|
|
break;
|
|
#endif
|
|
default:
|
|
SSL_DEBUG_MSG( 2, ( "Server used unsupported HashAlgorithm %d", p[0] ) );
|
|
SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "Server used SignatureAlgorithm %d", p[1] ) );
|
|
SSL_DEBUG_MSG( 2, ( "Server used HashAlgorithm %d", p[0] ) );
|
|
p += 2;
|
|
}
|
|
|
|
n = ( p[0] << 8 ) | p[1];
|
|
p += 2;
|
|
|
|
if( end != p + n )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
|
|
}
|
|
|
|
if( (unsigned int)( end - p ) !=
|
|
ssl->session_negotiate->peer_cert->rsa.len )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
|
|
}
|
|
|
|
#if defined(POLARSSL_DHM_C)
|
|
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_RSA )
|
|
{
|
|
if( ssl->handshake->dhm_ctx.len < 64 ||
|
|
ssl->handshake->dhm_ctx.len > 512 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad server key exchange message (DHM length)" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
|
|
}
|
|
|
|
SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P );
|
|
SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G );
|
|
SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY );
|
|
}
|
|
#endif
|
|
|
|
#if defined(POLARSSL_ECDH_C)
|
|
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_RSA )
|
|
{
|
|
if( ssl->handshake->ecdh_ctx.grp.nbits < 163 ||
|
|
ssl->handshake->ecdh_ctx.grp.nbits > 521 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad server key exchange message (ECDH length)" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
|
|
}
|
|
|
|
SSL_DEBUG_ECP( 3, "ECDH: Qp", &ssl->handshake->ecdh_ctx.Qp );
|
|
}
|
|
#endif
|
|
|
|
if( ssl->minor_ver != SSL_MINOR_VERSION_3 )
|
|
{
|
|
/*
|
|
* 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);
|
|
*/
|
|
n = ssl->in_hslen - ( end - p ) - 6;
|
|
|
|
md5_starts( &md5 );
|
|
md5_update( &md5, ssl->handshake->randbytes, 64 );
|
|
md5_update( &md5, ssl->in_msg + 4, n );
|
|
md5_finish( &md5, hash );
|
|
|
|
sha1_starts( &sha1 );
|
|
sha1_update( &sha1, ssl->handshake->randbytes, 64 );
|
|
sha1_update( &sha1, ssl->in_msg + 4, n );
|
|
sha1_finish( &sha1, hash + 16 );
|
|
|
|
hash_id = SIG_RSA_RAW;
|
|
hashlen = 36;
|
|
}
|
|
else
|
|
{
|
|
sha2_context sha2;
|
|
#if defined(POLARSSL_SHA4_C)
|
|
sha4_context sha4;
|
|
#endif
|
|
|
|
n = ssl->in_hslen - ( end - p ) - 8;
|
|
|
|
/*
|
|
* digitally-signed struct {
|
|
* opaque client_random[32];
|
|
* opaque server_random[32];
|
|
* ServerDHParams params;
|
|
* };
|
|
*/
|
|
switch( hash_id )
|
|
{
|
|
#if defined(POLARSSL_MD5_C)
|
|
case SIG_RSA_MD5:
|
|
md5_starts( &md5 );
|
|
md5_update( &md5, ssl->handshake->randbytes, 64 );
|
|
md5_update( &md5, ssl->in_msg + 4, n );
|
|
md5_finish( &md5, hash );
|
|
hashlen = 16;
|
|
break;
|
|
#endif
|
|
#if defined(POLARSSL_SHA1_C)
|
|
case SIG_RSA_SHA1:
|
|
sha1_starts( &sha1 );
|
|
sha1_update( &sha1, ssl->handshake->randbytes, 64 );
|
|
sha1_update( &sha1, ssl->in_msg + 4, n );
|
|
sha1_finish( &sha1, hash );
|
|
hashlen = 20;
|
|
break;
|
|
#endif
|
|
#if defined(POLARSSL_SHA2_C)
|
|
case SIG_RSA_SHA224:
|
|
sha2_starts( &sha2, 1 );
|
|
sha2_update( &sha2, ssl->handshake->randbytes, 64 );
|
|
sha2_update( &sha2, ssl->in_msg + 4, n );
|
|
sha2_finish( &sha2, hash );
|
|
hashlen = 28;
|
|
break;
|
|
case SIG_RSA_SHA256:
|
|
sha2_starts( &sha2, 0 );
|
|
sha2_update( &sha2, ssl->handshake->randbytes, 64 );
|
|
sha2_update( &sha2, ssl->in_msg + 4, n );
|
|
sha2_finish( &sha2, hash );
|
|
hashlen = 32;
|
|
break;
|
|
#endif
|
|
#if defined(POLARSSL_SHA4_C)
|
|
case SIG_RSA_SHA384:
|
|
sha4_starts( &sha4, 1 );
|
|
sha4_update( &sha4, ssl->handshake->randbytes, 64 );
|
|
sha4_update( &sha4, ssl->in_msg + 4, n );
|
|
sha4_finish( &sha4, hash );
|
|
hashlen = 48;
|
|
break;
|
|
case SIG_RSA_SHA512:
|
|
sha4_starts( &sha4, 0 );
|
|
sha4_update( &sha4, ssl->handshake->randbytes, 64 );
|
|
sha4_update( &sha4, ssl->in_msg + 4, n );
|
|
sha4_finish( &sha4, hash );
|
|
hashlen = 64;
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen );
|
|
|
|
if( ( ret = rsa_pkcs1_verify( &ssl->session_negotiate->peer_cert->rsa,
|
|
RSA_PUBLIC,
|
|
hash_id, hashlen, hash, p ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "rsa_pkcs1_verify", ret );
|
|
return( ret );
|
|
}
|
|
|
|
ssl->state++;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= parse server key exchange" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* POLARSSL_DHM_C || POLARSSL_ECDH_C */
|
|
|
|
static int ssl_parse_certificate_request( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
unsigned char *buf, *p;
|
|
size_t n = 0, m = 0;
|
|
size_t cert_type_len = 0, sig_alg_len = 0, dn_len = 0;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) );
|
|
|
|
/*
|
|
* 0 . 0 handshake type
|
|
* 1 . 3 handshake length
|
|
* 4 . 4 cert type count
|
|
* 5 .. m-1 cert types
|
|
* m .. m+1 sig alg length (TLS 1.2 only)
|
|
* m+1 .. n-1 SignatureAndHashAlgorithms (TLS 1.2 only)
|
|
* n .. n+1 length of all DNs
|
|
* n+2 .. n+3 length of DN 1
|
|
* n+4 .. ... Distinguished Name #1
|
|
* ... .. ... length of DN 2, etc.
|
|
*/
|
|
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 certificate request message" ) );
|
|
return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
|
|
ssl->client_auth = 0;
|
|
ssl->state++;
|
|
|
|
if( ssl->in_msg[0] == SSL_HS_CERTIFICATE_REQUEST )
|
|
ssl->client_auth++;
|
|
|
|
SSL_DEBUG_MSG( 3, ( "got %s certificate request",
|
|
ssl->client_auth ? "a" : "no" ) );
|
|
|
|
if( ssl->client_auth == 0 )
|
|
goto exit;
|
|
|
|
// TODO: handshake_failure alert for an anonymous server to request
|
|
// client authentication
|
|
|
|
buf = ssl->in_msg;
|
|
|
|
// Retrieve cert types
|
|
//
|
|
cert_type_len = buf[4];
|
|
n = cert_type_len;
|
|
|
|
if( ssl->in_hslen < 6 + n )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
|
|
}
|
|
|
|
p = buf + 4;
|
|
while( cert_type_len > 0 )
|
|
{
|
|
if( *p == SSL_CERT_TYPE_RSA_SIGN )
|
|
{
|
|
ssl->handshake->cert_type = SSL_CERT_TYPE_RSA_SIGN;
|
|
break;
|
|
}
|
|
|
|
cert_type_len--;
|
|
p++;
|
|
}
|
|
|
|
if( ssl->handshake->cert_type == 0 )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "no known cert_type provided" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
|
|
}
|
|
|
|
if( ssl->minor_ver == SSL_MINOR_VERSION_3 )
|
|
{
|
|
sig_alg_len = ( ( buf[5 + n] << 8 )
|
|
| ( buf[6 + n] ) );
|
|
|
|
p = buf + 7 + n;
|
|
m += 2;
|
|
n += sig_alg_len;
|
|
|
|
if( ssl->in_hslen < 6 + n )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
|
|
}
|
|
}
|
|
|
|
dn_len = ( ( buf[5 + m + n] << 8 )
|
|
| ( buf[6 + m + n] ) );
|
|
|
|
n += dn_len;
|
|
if( ssl->in_hslen != 7 + m + n )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
|
|
}
|
|
|
|
exit:
|
|
SSL_DEBUG_MSG( 2, ( "<= parse certificate request" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ssl_parse_server_hello_done( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> parse server hello done" ) );
|
|
|
|
if( ssl->client_auth != 0 )
|
|
{
|
|
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 server hello done message" ) );
|
|
return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
|
|
}
|
|
}
|
|
|
|
if( ssl->in_hslen != 4 ||
|
|
ssl->in_msg[0] != SSL_HS_SERVER_HELLO_DONE )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) );
|
|
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO_DONE );
|
|
}
|
|
|
|
ssl->state++;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= parse server hello done" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ssl_write_client_key_exchange( ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
size_t i, n;
|
|
#if defined(POLARSSL_DHM_C) || defined(POLARSSL_ECDH_C)
|
|
const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
|
|
#endif
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> write client key exchange" ) );
|
|
|
|
#if defined(POLARSSL_DHM_C)
|
|
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_RSA )
|
|
{
|
|
/*
|
|
* DHM key exchange -- send G^X mod P
|
|
*/
|
|
n = ssl->handshake->dhm_ctx.len;
|
|
|
|
ssl->out_msg[4] = (unsigned char)( n >> 8 );
|
|
ssl->out_msg[5] = (unsigned char)( n );
|
|
i = 6;
|
|
|
|
ret = dhm_make_public( &ssl->handshake->dhm_ctx,
|
|
mpi_size( &ssl->handshake->dhm_ctx.P ),
|
|
&ssl->out_msg[i], n,
|
|
ssl->f_rng, ssl->p_rng );
|
|
if( ret != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "dhm_make_public", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X );
|
|
SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX );
|
|
|
|
ssl->handshake->pmslen = ssl->handshake->dhm_ctx.len;
|
|
|
|
if( ( ret = dhm_calc_secret( &ssl->handshake->dhm_ctx,
|
|
ssl->handshake->premaster,
|
|
&ssl->handshake->pmslen ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "dhm_calc_secret", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
|
|
}
|
|
else
|
|
#endif /* POLARSSL_DHM_C */
|
|
#if defined(POLARSSL_ECDH_C)
|
|
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_RSA )
|
|
{
|
|
/*
|
|
* ECDH key exchange -- send client public value
|
|
*/
|
|
i = 4;
|
|
|
|
ret = ecdh_make_public( &ssl->handshake->ecdh_ctx,
|
|
&n,
|
|
&ssl->out_msg[i], 1000,
|
|
ssl->f_rng, ssl->p_rng );
|
|
if( ret != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ecdh_make_public", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_ECP( 3, "ECDH: Q", &ssl->handshake->ecdh_ctx.Q );
|
|
|
|
if( ( ret = ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
|
|
&ssl->handshake->pmslen,
|
|
ssl->handshake->premaster,
|
|
POLARSSL_MPI_MAX_SIZE ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ecdh_calc_secret", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
|
|
}
|
|
else
|
|
#endif /* POLARSSL_ECDH_C */
|
|
{
|
|
/*
|
|
* RSA key exchange -- send rsa_public(pkcs1 v1.5(premaster))
|
|
*/
|
|
ssl->handshake->premaster[0] = (unsigned char) ssl->max_major_ver;
|
|
ssl->handshake->premaster[1] = (unsigned char) ssl->max_minor_ver;
|
|
ssl->handshake->pmslen = 48;
|
|
|
|
ret = ssl->f_rng( ssl->p_rng, ssl->handshake->premaster + 2,
|
|
ssl->handshake->pmslen - 2 );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
i = 4;
|
|
n = ssl->session_negotiate->peer_cert->rsa.len;
|
|
|
|
if( ssl->minor_ver != SSL_MINOR_VERSION_0 )
|
|
{
|
|
i += 2;
|
|
ssl->out_msg[4] = (unsigned char)( n >> 8 );
|
|
ssl->out_msg[5] = (unsigned char)( n );
|
|
}
|
|
|
|
ret = rsa_pkcs1_encrypt( &ssl->session_negotiate->peer_cert->rsa,
|
|
ssl->f_rng, ssl->p_rng,
|
|
RSA_PUBLIC,
|
|
ssl->handshake->pmslen,
|
|
ssl->handshake->premaster,
|
|
ssl->out_msg + i );
|
|
if( ret != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "rsa_pkcs1_encrypt", ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
|
|
if( ( ret = ssl_derive_keys( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_derive_keys", ret );
|
|
return( ret );
|
|
}
|
|
|
|
ssl->out_msglen = i + n;
|
|
ssl->out_msgtype = SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = SSL_HS_CLIENT_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 client key exchange" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ssl_write_certificate_verify( ssl_context *ssl )
|
|
{
|
|
int ret = 0;
|
|
size_t n = 0, offset = 0;
|
|
unsigned char hash[48];
|
|
int hash_id = SIG_RSA_RAW;
|
|
unsigned int hashlen = 36;
|
|
|
|
SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
|
|
|
|
if( ssl->client_auth == 0 || ssl->own_cert == NULL )
|
|
{
|
|
SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
|
|
ssl->state++;
|
|
return( 0 );
|
|
}
|
|
|
|
if( ssl->rsa_key == NULL )
|
|
{
|
|
SSL_DEBUG_MSG( 1, ( "got no private key" ) );
|
|
return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED );
|
|
}
|
|
|
|
/*
|
|
* Make an RSA signature of the handshake digests
|
|
*/
|
|
ssl->handshake->calc_verify( ssl, hash );
|
|
|
|
if( ssl->minor_ver != SSL_MINOR_VERSION_3 )
|
|
{
|
|
/*
|
|
* digitally-signed struct {
|
|
* opaque md5_hash[16];
|
|
* opaque sha_hash[20];
|
|
* };
|
|
*
|
|
* md5_hash
|
|
* MD5(handshake_messages);
|
|
*
|
|
* sha_hash
|
|
* SHA(handshake_messages);
|
|
*/
|
|
hashlen = 36;
|
|
hash_id = SIG_RSA_RAW;
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* digitally-signed struct {
|
|
* opaque handshake_messages[handshake_messages_length];
|
|
* };
|
|
*
|
|
* Taking shortcut here. We assume that the server always allows the
|
|
* PRF Hash function and has sent it in the allowed signature
|
|
* algorithms list received in the Certificate Request message.
|
|
*
|
|
* Until we encounter a server that does not, we will take this
|
|
* shortcut.
|
|
*
|
|
* Reason: Otherwise we should have running hashes for SHA512 and SHA224
|
|
* in order to satisfy 'weird' needs from the server side.
|
|
*/
|
|
if( ssl->transform_negotiate->ciphersuite_info->mac ==
|
|
POLARSSL_MD_SHA384 )
|
|
{
|
|
hash_id = SIG_RSA_SHA384;
|
|
hashlen = 48;
|
|
ssl->out_msg[4] = SSL_HASH_SHA384;
|
|
ssl->out_msg[5] = SSL_SIG_RSA;
|
|
}
|
|
else
|
|
{
|
|
hash_id = SIG_RSA_SHA256;
|
|
hashlen = 32;
|
|
ssl->out_msg[4] = SSL_HASH_SHA256;
|
|
ssl->out_msg[5] = SSL_SIG_RSA;
|
|
}
|
|
|
|
offset = 2;
|
|
}
|
|
|
|
if ( ssl->rsa_key )
|
|
n = ssl->rsa_key_len ( ssl->rsa_key );
|
|
|
|
ssl->out_msg[4 + offset] = (unsigned char)( n >> 8 );
|
|
ssl->out_msg[5 + offset] = (unsigned char)( n );
|
|
|
|
if( ssl->rsa_key )
|
|
{
|
|
ret = ssl->rsa_sign( ssl->rsa_key, ssl->f_rng, ssl->p_rng,
|
|
RSA_PRIVATE, hash_id,
|
|
hashlen, hash, ssl->out_msg + 6 + offset );
|
|
}
|
|
|
|
if (ret != 0)
|
|
{
|
|
SSL_DEBUG_RET( 1, "pkcs1_sign", ret );
|
|
return( ret );
|
|
}
|
|
|
|
ssl->out_msglen = 6 + n + offset;
|
|
ssl->out_msgtype = SSL_MSG_HANDSHAKE;
|
|
ssl->out_msg[0] = SSL_HS_CERTIFICATE_VERIFY;
|
|
|
|
ssl->state++;
|
|
|
|
if( ( ret = ssl_write_record( ssl ) ) != 0 )
|
|
{
|
|
SSL_DEBUG_RET( 1, "ssl_write_record", ret );
|
|
return( ret );
|
|
}
|
|
|
|
SSL_DEBUG_MSG( 2, ( "<= write certificate verify" ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* SSL handshake -- client side -- single step
|
|
*/
|
|
int ssl_handshake_client_step( ssl_context *ssl )
|
|
{
|
|
int ret = 0;
|
|
|
|
if( ssl->state == SSL_HANDSHAKE_OVER )
|
|
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
SSL_DEBUG_MSG( 2, ( "client state: %d", ssl->state ) );
|
|
|
|
if( ( ret = ssl_flush_output( ssl ) ) != 0 )
|
|
return( ret );
|
|
|
|
switch( ssl->state )
|
|
{
|
|
case SSL_HELLO_REQUEST:
|
|
ssl->state = SSL_CLIENT_HELLO;
|
|
break;
|
|
|
|
/*
|
|
* ==> ClientHello
|
|
*/
|
|
case SSL_CLIENT_HELLO:
|
|
ret = ssl_write_client_hello( ssl );
|
|
break;
|
|
|
|
/*
|
|
* <== ServerHello
|
|
* Certificate
|
|
* ( ServerKeyExchange )
|
|
* ( CertificateRequest )
|
|
* ServerHelloDone
|
|
*/
|
|
case SSL_SERVER_HELLO:
|
|
ret = ssl_parse_server_hello( ssl );
|
|
break;
|
|
|
|
case SSL_SERVER_CERTIFICATE:
|
|
ret = ssl_parse_certificate( ssl );
|
|
break;
|
|
|
|
case SSL_SERVER_KEY_EXCHANGE:
|
|
ret = ssl_parse_server_key_exchange( ssl );
|
|
break;
|
|
|
|
case SSL_CERTIFICATE_REQUEST:
|
|
ret = ssl_parse_certificate_request( ssl );
|
|
break;
|
|
|
|
case SSL_SERVER_HELLO_DONE:
|
|
ret = ssl_parse_server_hello_done( ssl );
|
|
break;
|
|
|
|
/*
|
|
* ==> ( Certificate/Alert )
|
|
* ClientKeyExchange
|
|
* ( CertificateVerify )
|
|
* ChangeCipherSpec
|
|
* Finished
|
|
*/
|
|
case SSL_CLIENT_CERTIFICATE:
|
|
ret = ssl_write_certificate( ssl );
|
|
break;
|
|
|
|
case SSL_CLIENT_KEY_EXCHANGE:
|
|
ret = ssl_write_client_key_exchange( ssl );
|
|
break;
|
|
|
|
case SSL_CERTIFICATE_VERIFY:
|
|
ret = ssl_write_certificate_verify( ssl );
|
|
break;
|
|
|
|
case SSL_CLIENT_CHANGE_CIPHER_SPEC:
|
|
ret = ssl_write_change_cipher_spec( ssl );
|
|
break;
|
|
|
|
case SSL_CLIENT_FINISHED:
|
|
ret = ssl_write_finished( ssl );
|
|
break;
|
|
|
|
/*
|
|
* <== ChangeCipherSpec
|
|
* Finished
|
|
*/
|
|
case SSL_SERVER_CHANGE_CIPHER_SPEC:
|
|
ret = ssl_parse_change_cipher_spec( ssl );
|
|
break;
|
|
|
|
case SSL_SERVER_FINISHED:
|
|
ret = ssl_parse_finished( ssl );
|
|
break;
|
|
|
|
case SSL_FLUSH_BUFFERS:
|
|
SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
|
|
ssl->state = SSL_HANDSHAKE_WRAPUP;
|
|
break;
|
|
|
|
case SSL_HANDSHAKE_WRAPUP:
|
|
ssl_handshake_wrapup( ssl );
|
|
break;
|
|
|
|
default:
|
|
SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
|
|
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
return( ret );
|
|
}
|
|
#endif
|