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mbedtls/library/ssl_cli.c
Paul Bakker c70b982056 OID functionality moved to a separate module. 
A new OID module has been created that contains the main OID searching
functionality based on type-dependent arrays. A base type is used to
contain the basic values (oid_descriptor_t) and that type is extended to
contain type specific information (like a pk_alg_t).

As a result the rsa sign and verify function prototypes have changed. They
now expect a md_type_t identifier instead of the removed RSA_SIG_XXX
defines.

All OID definitions have been moved to oid.h
All OID matching code is in the OID module.

The RSA PKCS#1 functions cleaned up as a result and adapted to use the
MD layer.

The SSL layer cleanup up as a result and adapted to use the MD layer.

The X509 parser cleaned up and matches OIDs in certificates with new
module and adapted to use the MD layer.

The X509 writer cleaned up and adapted to use the MD layer.

Apps and tests modified accordingly
2013-04-07 22:00:46 +02:00

1506 lines
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/*
* SSLv3/TLSv1 client-side functions
*
* Copyright (C) 2006-2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "polarssl/config.h"
#if defined(POLARSSL_SSL_CLI_C)
#include "polarssl/debug.h"
#include "polarssl/ssl.h"
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#if defined(POLARSSL_SHA4_C)
#include "polarssl/sha4.h"
#endif
static void ssl_write_hostname_ext( ssl_context *ssl,
unsigned char *buf,
size_t *olen )
{
unsigned char *p = buf;
*olen = 0;
if ( ssl->hostname == NULL )
return;
SSL_DEBUG_MSG( 3, ( "client hello, adding server name extension: %s",
ssl->hostname ) );
/*
* struct {
* NameType name_type;
* select (name_type) {
* case host_name: HostName;
* } name;
* } ServerName;
*
* enum {
* host_name(0), (255)
* } NameType;
*
* opaque HostName<1..2^16-1>;
*
* struct {
* ServerName server_name_list<1..2^16-1>
* } ServerNameList;
*/
*p++ = (unsigned char)( ( TLS_EXT_SERVERNAME >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( TLS_EXT_SERVERNAME ) & 0xFF );
*p++ = (unsigned char)( ( (ssl->hostname_len + 5) >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( (ssl->hostname_len + 5) ) & 0xFF );
*p++ = (unsigned char)( ( (ssl->hostname_len + 3) >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( (ssl->hostname_len + 3) ) & 0xFF );
*p++ = (unsigned char)( ( TLS_EXT_SERVERNAME_HOSTNAME ) & 0xFF );
*p++ = (unsigned char)( ( ssl->hostname_len >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( ssl->hostname_len ) & 0xFF );
memcpy( p, ssl->hostname, ssl->hostname_len );
*olen = ssl->hostname_len + 9;
}
static void ssl_write_renegotiation_ext( ssl_context *ssl,
unsigned char *buf,
size_t *olen )
{
unsigned char *p = buf;
*olen = 0;
if( ssl->renegotiation != SSL_RENEGOTIATION )
return;
SSL_DEBUG_MSG( 3, ( "client hello, adding renegotiation extension" ) );
/*
* Secure renegotiation
*/
*p++ = (unsigned char)( ( TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( TLS_EXT_RENEGOTIATION_INFO ) & 0xFF );
*p++ = 0x00;
*p++ = ( ssl->verify_data_len + 1 ) & 0xFF;
*p++ = ssl->verify_data_len & 0xFF;
memcpy( p, ssl->own_verify_data, ssl->verify_data_len );
*olen = 5 + ssl->verify_data_len;
}
static void ssl_write_signature_algorithms_ext( ssl_context *ssl,
unsigned char *buf,
size_t *olen )
{
unsigned char *p = buf;
unsigned char sig_alg_list[20];
size_t sig_alg_len = 0;
*olen = 0;
if( ssl->max_minor_ver != SSL_MINOR_VERSION_3 )
return;
SSL_DEBUG_MSG( 3, ( "client hello, adding signature_algorithms extension" ) );
/*
* Prepare signature_algorithms extension (TLS 1.2)
*/
#if defined(POLARSSL_SHA4_C)
sig_alg_list[sig_alg_len++] = SSL_HASH_SHA512;
sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
sig_alg_list[sig_alg_len++] = SSL_HASH_SHA384;
sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
#endif
#if defined(POLARSSL_SHA2_C)
sig_alg_list[sig_alg_len++] = SSL_HASH_SHA256;
sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
sig_alg_list[sig_alg_len++] = SSL_HASH_SHA224;
sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
#endif
#if defined(POLARSSL_SHA1_C)
sig_alg_list[sig_alg_len++] = SSL_HASH_SHA1;
sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
#endif
#if defined(POLARSSL_MD5_C)
sig_alg_list[sig_alg_len++] = SSL_HASH_MD5;
sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
#endif
/*
* enum {
* none(0), md5(1), sha1(2), sha224(3), sha256(4), sha384(5),
* sha512(6), (255)
* } HashAlgorithm;
*
* enum { anonymous(0), rsa(1), dsa(2), ecdsa(3), (255) }
* SignatureAlgorithm;
*
* struct {
* HashAlgorithm hash;
* SignatureAlgorithm signature;
* } SignatureAndHashAlgorithm;
*
* SignatureAndHashAlgorithm
* supported_signature_algorithms<2..2^16-2>;
*/
*p++ = (unsigned char)( ( TLS_EXT_SIG_ALG >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( TLS_EXT_SIG_ALG ) & 0xFF );
*p++ = (unsigned char)( ( ( sig_alg_len + 2 ) >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( ( sig_alg_len + 2 ) ) & 0xFF );
*p++ = (unsigned char)( ( sig_alg_len >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( sig_alg_len ) & 0xFF );
memcpy( p, sig_alg_list, sig_alg_len );
*olen = 6 + sig_alg_len;
}
#if defined(POLARSSL_ECDH_C)
static void ssl_write_supported_elliptic_curves_ext( ssl_context *ssl,
unsigned char *buf,
size_t *olen )
{
unsigned char *p = buf;
unsigned char elliptic_curve_list[20];
size_t elliptic_curve_len = 0;
*olen = 0;
SSL_DEBUG_MSG( 3, ( "client hello, adding supported_elliptic_curves extension" ) );
elliptic_curve_list[elliptic_curve_len++] = 0x00;
elliptic_curve_list[elliptic_curve_len++] = POLARSSL_ECP_DP_SECP521R1;
elliptic_curve_list[elliptic_curve_len++] = 0x00;
elliptic_curve_list[elliptic_curve_len++] = POLARSSL_ECP_DP_SECP384R1;
elliptic_curve_list[elliptic_curve_len++] = 0x00;
elliptic_curve_list[elliptic_curve_len++] = POLARSSL_ECP_DP_SECP256R1;
elliptic_curve_list[elliptic_curve_len++] = 0x00;
elliptic_curve_list[elliptic_curve_len++] = POLARSSL_ECP_DP_SECP224R1;
elliptic_curve_list[elliptic_curve_len++] = 0x00;
elliptic_curve_list[elliptic_curve_len++] = POLARSSL_ECP_DP_SECP192R1;
*p++ = (unsigned char)( ( TLS_EXT_SUPPORTED_ELLIPTIC_CURVES >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( TLS_EXT_SUPPORTED_ELLIPTIC_CURVES ) & 0xFF );
*p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) ) & 0xFF );
*p++ = (unsigned char)( ( ( elliptic_curve_len ) >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( ( elliptic_curve_len ) ) & 0xFF );
memcpy( p, elliptic_curve_list, elliptic_curve_len );
*olen = 6 + elliptic_curve_len;
}
static void ssl_write_supported_point_formats_ext( ssl_context *ssl,
unsigned char *buf,
size_t *olen )
{
unsigned char *p = buf;
*olen = 0;
SSL_DEBUG_MSG( 3, ( "client hello, adding supported_point_formats extension" ) );
*p++ = (unsigned char)( ( TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF );
*p++ = 0x00;
*p++ = 3;
*p++ = 2;
*p++ = POLARSSL_ECP_PF_COMPRESSED;
*p++ = POLARSSL_ECP_PF_UNCOMPRESSED;
*olen = 7;
}
#endif
static int ssl_write_client_hello( ssl_context *ssl )
{
int ret;
size_t i, n, olen, ext_len = 0;
unsigned char *buf;
unsigned char *p;
time_t t;
SSL_DEBUG_MSG( 2, ( "=> write client hello" ) );
if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE )
{
ssl->major_ver = ssl->min_major_ver;
ssl->minor_ver = ssl->min_minor_ver;
}
if( ssl->max_major_ver == 0 && ssl->max_minor_ver == 0 )
{
ssl->max_major_ver = SSL_MAJOR_VERSION_3;
ssl->max_minor_ver = SSL_MINOR_VERSION_3;
}
/*
* 0 . 0 handshake type
* 1 . 3 handshake length
* 4 . 5 highest version supported
* 6 . 9 current UNIX time
* 10 . 37 random bytes
*/
buf = ssl->out_msg;
p = buf + 4;
*p++ = (unsigned char) ssl->max_major_ver;
*p++ = (unsigned char) ssl->max_minor_ver;
SSL_DEBUG_MSG( 3, ( "client hello, max version: [%d:%d]",
buf[4], buf[5] ) );
t = time( NULL );
*p++ = (unsigned char)( t >> 24 );
*p++ = (unsigned char)( t >> 16 );
*p++ = (unsigned char)( t >> 8 );
*p++ = (unsigned char)( t );
SSL_DEBUG_MSG( 3, ( "client hello, current time: %lu", t ) );
if( ( ret = ssl->f_rng( ssl->p_rng, p, 28 ) ) != 0 )
return( ret );
p += 28;
memcpy( ssl->handshake->randbytes, buf + 6, 32 );
SSL_DEBUG_BUF( 3, "client hello, random bytes", buf + 6, 32 );
/*
* 38 . 38 session id length
* 39 . 39+n session id
* 40+n . 41+n ciphersuitelist length
* 42+n . .. ciphersuitelist
* .. . .. compression methods length
* .. . .. compression methods
* .. . .. extensions length
* .. . .. extensions
*/
n = ssl->session_negotiate->length;
if( ssl->renegotiation != SSL_INITIAL_HANDSHAKE || n < 16 || n > 32 ||
ssl->handshake->resume == 0 )
n = 0;
*p++ = (unsigned char) n;
for( i = 0; i < n; i++ )
*p++ = ssl->session_negotiate->id[i];
SSL_DEBUG_MSG( 3, ( "client hello, session id len.: %d", n ) );
SSL_DEBUG_BUF( 3, "client hello, session id", buf + 39, n );
for( n = 0; ssl->ciphersuites[n] != 0; n++ );
if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE ) n++;
*p++ = (unsigned char)( n >> 7 );
*p++ = (unsigned char)( n << 1 );
/*
* Add TLS_EMPTY_RENEGOTIATION_INFO_SCSV
*/
if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE )
{
*p++ = (unsigned char)( SSL_EMPTY_RENEGOTIATION_INFO >> 8 );
*p++ = (unsigned char)( SSL_EMPTY_RENEGOTIATION_INFO );
n--;
}
SSL_DEBUG_MSG( 3, ( "client hello, got %d ciphersuites", n ) );
for( i = 0; i < n; i++ )
{
SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %2d",
ssl->ciphersuites[i] ) );
*p++ = (unsigned char)( ssl->ciphersuites[i] >> 8 );
*p++ = (unsigned char)( ssl->ciphersuites[i] );
}
#if defined(POLARSSL_ZLIB_SUPPORT)
SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 2 ) );
SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d %d",
SSL_COMPRESS_DEFLATE, SSL_COMPRESS_NULL ) );
*p++ = 2;
*p++ = SSL_COMPRESS_DEFLATE;
*p++ = SSL_COMPRESS_NULL;
#else
SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 1 ) );
SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d", SSL_COMPRESS_NULL ) );
*p++ = 1;
*p++ = SSL_COMPRESS_NULL;
#endif
// First write extensions, then the total length
//
ssl_write_hostname_ext( ssl, p + 2 + ext_len, &olen );
ext_len += olen;
ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen );
ext_len += olen;
ssl_write_signature_algorithms_ext( ssl, p + 2 + ext_len, &olen );
ext_len += olen;
#if defined(POLARSSL_ECDH_C)
ssl_write_supported_elliptic_curves_ext( ssl, p + 2 + ext_len, &olen );
ext_len += olen;
ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen );
ext_len += olen;
#endif
SSL_DEBUG_MSG( 3, ( "client hello, total extension length: %d",
ext_len ) );
*p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( ext_len ) & 0xFF );
p += ext_len;
ssl->out_msglen = p - buf;
ssl->out_msgtype = SSL_MSG_HANDSHAKE;
ssl->out_msg[0] = SSL_HS_CLIENT_HELLO;
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 hello" ) );
return( 0 );
}
static int ssl_parse_renegotiation_info( ssl_context *ssl,
unsigned char *buf,
size_t len )
{
int ret;
if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE )
{
if( len != 1 || buf[0] != 0x0 )
{
SSL_DEBUG_MSG( 1, ( "non-zero length renegotiated connection field" ) );
if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
return( ret );
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
}
ssl->secure_renegotiation = SSL_SECURE_RENEGOTIATION;
}
else
{
if( len != 1 + ssl->verify_data_len * 2 ||
buf[0] != ssl->verify_data_len * 2 ||
memcmp( buf + 1, ssl->own_verify_data, ssl->verify_data_len ) != 0 ||
memcmp( buf + 1 + ssl->verify_data_len,
ssl->peer_verify_data, ssl->verify_data_len ) != 0 )
{
SSL_DEBUG_MSG( 1, ( "non-matching renegotiated connection field" ) );
if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
return( ret );
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
}
}
return( 0 );
}
static int ssl_parse_server_hello( ssl_context *ssl )
{
#if defined(POLARSSL_DEBUG_C)
time_t t;
#endif
int ret, i, comp;
size_t n;
size_t ext_len = 0;
unsigned char *buf, *ext;
int renegotiation_info_seen = 0;
int handshake_failure = 0;
SSL_DEBUG_MSG( 2, ( "=> parse server hello" ) );
/*
* 0 . 0 handshake type
* 1 . 3 handshake length
* 4 . 5 protocol version
* 6 . 9 UNIX time()
* 10 . 37 random bytes
*/
buf = ssl->in_msg;
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 message" ) );
return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
}
SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]",
buf[4], buf[5] ) );
if( ssl->in_hslen < 42 ||
buf[0] != SSL_HS_SERVER_HELLO ||
buf[4] != SSL_MAJOR_VERSION_3 )
{
SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
}
if( buf[5] > ssl->max_minor_ver )
{
SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
}
ssl->minor_ver = buf[5];
if( ssl->minor_ver < ssl->min_minor_ver )
{
SSL_DEBUG_MSG( 1, ( "server only supports ssl smaller than minimum"
" [%d:%d] < [%d:%d]", ssl->major_ver, ssl->minor_ver,
buf[4], buf[5] ) );
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];
md_type_t md_alg = POLARSSL_MD_NONE;
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 );
p = ssl->in_msg + 4;
end = ssl->in_msg + ssl->in_hslen;
#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;
*/
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 );
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:
md_alg = POLARSSL_MD_MD5;
break;
#endif
#if defined(POLARSSL_SHA1_C)
case SSL_HASH_SHA1:
md_alg = POLARSSL_MD_SHA1;
break;
#endif
#if defined(POLARSSL_SHA2_C)
case SSL_HASH_SHA224:
md_alg = POLARSSL_MD_SHA224;
break;
case SSL_HASH_SHA256:
md_alg = POLARSSL_MD_SHA256;
break;
#endif
#if defined(POLARSSL_SHA4_C)
case SSL_HASH_SHA384:
md_alg = POLARSSL_MD_SHA384;
break;
case SSL_HASH_SHA512:
md_alg = POLARSSL_MD_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 )
{
md5_context md5;
sha1_context sha1;
/*
* 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 );
md_alg = POLARSSL_MD_NONE;
hashlen = 36;
}
else
{
md_context_t ctx;
n = ssl->in_hslen - ( end - p ) - 8;
/*
* digitally-signed struct {
* opaque client_random[32];
* opaque server_random[32];
* ServerDHParams params;
* };
*/
if( ( ret = md_init_ctx( &ctx, md_info_from_type( md_alg ) ) ) != 0 )
{
SSL_DEBUG_RET( 1, "md_init_ctx", ret );
return( ret );
}
md_starts( &ctx );
md_update( &ctx, ssl->handshake->randbytes, 64 );
md_update( &ctx, ssl->in_msg + 4, n );
md_finish( &ctx, hash );
}
SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen );
if( ( ret = rsa_pkcs1_verify( &ssl->session_negotiate->peer_cert->rsa,
RSA_PUBLIC,
md_alg, 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];
md_type_t md_alg = POLARSSL_MD_NONE;
unsigned int hashlen = 0;
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;
md_alg = POLARSSL_MD_NONE;
}
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 )
{
md_alg = POLARSSL_MD_SHA384;
ssl->out_msg[4] = SSL_HASH_SHA384;
ssl->out_msg[5] = SSL_SIG_RSA;
}
else
{
md_alg = POLARSSL_MD_SHA256;
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, md_alg,
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
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