7898fd456a
TLS 1.3 server: Send dummy change_cipher_spec records The internal CI PR-merge job ran successfully thus good to go.
1833 lines
59 KiB
C
1833 lines
59 KiB
C
/*
|
|
* TLS 1.3 server-side functions
|
|
*
|
|
* Copyright The Mbed TLS Contributors
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
* not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include "common.h"
|
|
|
|
#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_PROTO_TLS1_3)
|
|
|
|
#include "mbedtls/debug.h"
|
|
#include "mbedtls/error.h"
|
|
#include "mbedtls/platform.h"
|
|
|
|
#include "ssl_misc.h"
|
|
#include "ssl_tls13_keys.h"
|
|
#include "ssl_debug_helpers.h"
|
|
|
|
#if defined(MBEDTLS_ECP_C)
|
|
#include "mbedtls/ecp.h"
|
|
#endif /* MBEDTLS_ECP_C */
|
|
|
|
#if defined(MBEDTLS_PLATFORM_C)
|
|
#include "mbedtls/platform.h"
|
|
#else
|
|
#include <stdlib.h>
|
|
#define mbedtls_calloc calloc
|
|
#define mbedtls_free free
|
|
#endif /* MBEDTLS_PLATFORM_C */
|
|
|
|
#include "ssl_misc.h"
|
|
#include "ssl_tls13_keys.h"
|
|
#include "ssl_debug_helpers.h"
|
|
|
|
/* From RFC 8446:
|
|
* struct {
|
|
* ProtocolVersion versions<2..254>;
|
|
* } SupportedVersions;
|
|
*/
|
|
static int ssl_tls13_parse_supported_versions_ext( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf,
|
|
const unsigned char *end )
|
|
{
|
|
const unsigned char *p = buf;
|
|
size_t versions_len;
|
|
const unsigned char *versions_end;
|
|
uint16_t tls_version;
|
|
int tls13_supported = 0;
|
|
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 1 );
|
|
versions_len = p[0];
|
|
p += 1;
|
|
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, versions_len );
|
|
versions_end = p + versions_len;
|
|
while( p < versions_end )
|
|
{
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, versions_end, 2 );
|
|
tls_version = mbedtls_ssl_read_version( p, ssl->conf->transport );
|
|
p += 2;
|
|
|
|
/* In this implementation we only support TLS 1.3 and DTLS 1.3. */
|
|
if( tls_version == MBEDTLS_SSL_VERSION_TLS1_3 )
|
|
{
|
|
tls13_supported = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if( !tls13_supported )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLS 1.3 is not supported by the client" ) );
|
|
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION,
|
|
MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION );
|
|
return( MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Negotiated version. Supported is [%04x]",
|
|
(unsigned int)tls_version ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_ECDH_C)
|
|
/*
|
|
*
|
|
* From RFC 8446:
|
|
* enum {
|
|
* ... (0xFFFF)
|
|
* } NamedGroup;
|
|
* struct {
|
|
* NamedGroup named_group_list<2..2^16-1>;
|
|
* } NamedGroupList;
|
|
*/
|
|
static int ssl_tls13_parse_supported_groups_ext( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf,
|
|
const unsigned char *end )
|
|
{
|
|
const unsigned char *p = buf;
|
|
size_t named_group_list_len;
|
|
const unsigned char *named_group_list_end;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "supported_groups extension", p, end - buf );
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 );
|
|
named_group_list_len = MBEDTLS_GET_UINT16_BE( p, 0 );
|
|
p += 2;
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, named_group_list_len );
|
|
named_group_list_end = p + named_group_list_len;
|
|
ssl->handshake->hrr_selected_group = 0;
|
|
|
|
while( p < named_group_list_end )
|
|
{
|
|
uint16_t named_group;
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, named_group_list_end, 2 );
|
|
named_group = MBEDTLS_GET_UINT16_BE( p, 0 );
|
|
p += 2;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2,
|
|
( "got named group: %s(%04x)",
|
|
mbedtls_ssl_named_group_to_str( named_group ),
|
|
named_group ) );
|
|
|
|
if( ! mbedtls_ssl_named_group_is_offered( ssl, named_group ) ||
|
|
! mbedtls_ssl_named_group_is_supported( named_group ) ||
|
|
ssl->handshake->hrr_selected_group != 0 )
|
|
{
|
|
continue;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2,
|
|
( "add named group %s(%04x) into received list.",
|
|
mbedtls_ssl_named_group_to_str( named_group ),
|
|
named_group ) );
|
|
|
|
ssl->handshake->hrr_selected_group = named_group;
|
|
}
|
|
|
|
return( 0 );
|
|
|
|
}
|
|
#endif /* MBEDTLS_ECDH_C */
|
|
|
|
#define SSL_TLS1_3_PARSE_KEY_SHARES_EXT_NO_MATCH 1
|
|
|
|
#if defined(MBEDTLS_ECDH_C)
|
|
/*
|
|
* ssl_tls13_parse_key_shares_ext() verifies whether the information in the
|
|
* extension is correct and stores the first acceptable key share and its associated group.
|
|
*
|
|
* Possible return values are:
|
|
* - 0: Successful processing of the client provided key share extension.
|
|
* - SSL_TLS1_3_PARSE_KEY_SHARES_EXT_NO_MATCH: The key shares provided by the client
|
|
* does not match a group supported by the server. A HelloRetryRequest will
|
|
* be needed.
|
|
* - A negative value for fatal errors.
|
|
*/
|
|
static int ssl_tls13_parse_key_shares_ext( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf,
|
|
const unsigned char *end )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char const *p = buf;
|
|
unsigned char const *client_shares_end;
|
|
size_t client_shares_len;
|
|
|
|
/* From RFC 8446:
|
|
*
|
|
* struct {
|
|
* KeyShareEntry client_shares<0..2^16-1>;
|
|
* } KeyShareClientHello;
|
|
*
|
|
*/
|
|
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 );
|
|
client_shares_len = MBEDTLS_GET_UINT16_BE( p, 0 );
|
|
p += 2;
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, client_shares_len );
|
|
|
|
ssl->handshake->offered_group_id = 0;
|
|
client_shares_end = p + client_shares_len;
|
|
|
|
/* We try to find a suitable key share entry and copy it to the
|
|
* handshake context. Later, we have to find out whether we can do
|
|
* something with the provided key share or whether we have to
|
|
* dismiss it and send a HelloRetryRequest message.
|
|
*/
|
|
|
|
while( p < client_shares_end )
|
|
{
|
|
uint16_t group;
|
|
size_t key_exchange_len;
|
|
const unsigned char *key_exchange;
|
|
|
|
/*
|
|
* struct {
|
|
* NamedGroup group;
|
|
* opaque key_exchange<1..2^16-1>;
|
|
* } KeyShareEntry;
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, client_shares_end, 4 );
|
|
group = MBEDTLS_GET_UINT16_BE( p, 0 );
|
|
key_exchange_len = MBEDTLS_GET_UINT16_BE( p, 2 );
|
|
p += 4;
|
|
key_exchange = p;
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, client_shares_end, key_exchange_len );
|
|
p += key_exchange_len;
|
|
|
|
/* Continue parsing even if we have already found a match,
|
|
* for input validation purposes.
|
|
*/
|
|
if( ! mbedtls_ssl_named_group_is_offered( ssl, group ) ||
|
|
! mbedtls_ssl_named_group_is_supported( group ) ||
|
|
ssl->handshake->offered_group_id != 0 )
|
|
{
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* For now, we only support ECDHE groups.
|
|
*/
|
|
if( mbedtls_ssl_tls13_named_group_is_ecdhe( group ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDH group: %s (%04x)",
|
|
mbedtls_ssl_named_group_to_str( group ),
|
|
group ) );
|
|
ret = mbedtls_ssl_tls13_read_public_ecdhe_share(
|
|
ssl, key_exchange - 2, key_exchange_len + 2 );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
}
|
|
else
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 4, ( "Unrecognized NamedGroup %u",
|
|
(unsigned) group ) );
|
|
continue;
|
|
}
|
|
|
|
ssl->handshake->offered_group_id = group;
|
|
}
|
|
|
|
|
|
if( ssl->handshake->offered_group_id == 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "no matching key share" ) );
|
|
return( SSL_TLS1_3_PARSE_KEY_SHARES_EXT_NO_MATCH );
|
|
}
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_ECDH_C */
|
|
|
|
#if defined(MBEDTLS_DEBUG_C)
|
|
static void ssl_tls13_debug_print_client_hello_exts( mbedtls_ssl_context *ssl )
|
|
{
|
|
((void) ssl);
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "Supported Extensions:" ) );
|
|
MBEDTLS_SSL_DEBUG_MSG( 3,
|
|
( "- KEY_SHARE_EXTENSION ( %s )",
|
|
( ( ssl->handshake->extensions_present
|
|
& MBEDTLS_SSL_EXT_KEY_SHARE ) > 0 ) ? "TRUE" : "FALSE" ) );
|
|
MBEDTLS_SSL_DEBUG_MSG( 3,
|
|
( "- PSK_KEY_EXCHANGE_MODES_EXTENSION ( %s )",
|
|
( ( ssl->handshake->extensions_present
|
|
& MBEDTLS_SSL_EXT_PSK_KEY_EXCHANGE_MODES ) > 0 ) ?
|
|
"TRUE" : "FALSE" ) );
|
|
MBEDTLS_SSL_DEBUG_MSG( 3,
|
|
( "- PRE_SHARED_KEY_EXTENSION ( %s )",
|
|
( ( ssl->handshake->extensions_present
|
|
& MBEDTLS_SSL_EXT_PRE_SHARED_KEY ) > 0 ) ? "TRUE" : "FALSE" ) );
|
|
MBEDTLS_SSL_DEBUG_MSG( 3,
|
|
( "- SIGNATURE_ALGORITHM_EXTENSION ( %s )",
|
|
( ( ssl->handshake->extensions_present
|
|
& MBEDTLS_SSL_EXT_SIG_ALG ) > 0 ) ? "TRUE" : "FALSE" ) );
|
|
MBEDTLS_SSL_DEBUG_MSG( 3,
|
|
( "- SUPPORTED_GROUPS_EXTENSION ( %s )",
|
|
( ( ssl->handshake->extensions_present
|
|
& MBEDTLS_SSL_EXT_SUPPORTED_GROUPS ) >0 ) ?
|
|
"TRUE" : "FALSE" ) );
|
|
MBEDTLS_SSL_DEBUG_MSG( 3,
|
|
( "- SUPPORTED_VERSION_EXTENSION ( %s )",
|
|
( ( ssl->handshake->extensions_present
|
|
& MBEDTLS_SSL_EXT_SUPPORTED_VERSIONS ) > 0 ) ?
|
|
"TRUE" : "FALSE" ) );
|
|
#if defined ( MBEDTLS_SSL_SERVER_NAME_INDICATION )
|
|
MBEDTLS_SSL_DEBUG_MSG( 3,
|
|
( "- SERVERNAME_EXTENSION ( %s )",
|
|
( ( ssl->handshake->extensions_present
|
|
& MBEDTLS_SSL_EXT_SERVERNAME ) > 0 ) ?
|
|
"TRUE" : "FALSE" ) );
|
|
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
|
|
#if defined ( MBEDTLS_SSL_ALPN )
|
|
MBEDTLS_SSL_DEBUG_MSG( 3,
|
|
( "- ALPN_EXTENSION ( %s )",
|
|
( ( ssl->handshake->extensions_present
|
|
& MBEDTLS_SSL_EXT_ALPN ) > 0 ) ?
|
|
"TRUE" : "FALSE" ) );
|
|
#endif /* MBEDTLS_SSL_ALPN */
|
|
}
|
|
#endif /* MBEDTLS_DEBUG_C */
|
|
|
|
static int ssl_tls13_client_hello_has_exts( mbedtls_ssl_context *ssl,
|
|
int exts_mask )
|
|
{
|
|
int masked = ssl->handshake->extensions_present & exts_mask;
|
|
return( masked == exts_mask );
|
|
}
|
|
|
|
static int ssl_tls13_client_hello_has_exts_for_ephemeral_key_exchange(
|
|
mbedtls_ssl_context *ssl )
|
|
{
|
|
return( ssl_tls13_client_hello_has_exts( ssl,
|
|
MBEDTLS_SSL_EXT_SUPPORTED_GROUPS |
|
|
MBEDTLS_SSL_EXT_KEY_SHARE |
|
|
MBEDTLS_SSL_EXT_SIG_ALG ) );
|
|
}
|
|
|
|
static int ssl_tls13_check_ephemeral_key_exchange( mbedtls_ssl_context *ssl )
|
|
{
|
|
if( !mbedtls_ssl_conf_tls13_ephemeral_enabled( ssl ) )
|
|
return( 0 );
|
|
|
|
if( !ssl_tls13_client_hello_has_exts_for_ephemeral_key_exchange( ssl ) )
|
|
return( 0 );
|
|
|
|
ssl->handshake->tls13_kex_modes =
|
|
MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL;
|
|
return( 1 );
|
|
}
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
|
|
defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
|
|
/*
|
|
* Pick best ( private key, certificate chain ) pair based on the signature
|
|
* algorithms supported by the client.
|
|
*/
|
|
static int ssl_tls13_pick_key_cert( mbedtls_ssl_context *ssl )
|
|
{
|
|
mbedtls_ssl_key_cert *key_cert, *key_cert_list;
|
|
const uint16_t *sig_alg = ssl->handshake->received_sig_algs;
|
|
uint16_t key_sig_alg;
|
|
|
|
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
if( ssl->handshake->sni_key_cert != NULL )
|
|
key_cert_list = ssl->handshake->sni_key_cert;
|
|
else
|
|
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
|
|
key_cert_list = ssl->conf->key_cert;
|
|
|
|
if( key_cert_list == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server has no certificate" ) );
|
|
return( -1 );
|
|
}
|
|
|
|
for( ; *sig_alg != MBEDTLS_TLS1_3_SIG_NONE; sig_alg++ )
|
|
{
|
|
for( key_cert = key_cert_list; key_cert != NULL;
|
|
key_cert = key_cert->next )
|
|
{
|
|
int ret;
|
|
MBEDTLS_SSL_DEBUG_CRT( 3, "certificate (chain) candidate",
|
|
key_cert->cert );
|
|
|
|
/*
|
|
* This avoids sending the client a cert it'll reject based on
|
|
* keyUsage or other extensions.
|
|
*/
|
|
if( mbedtls_x509_crt_check_key_usage(
|
|
key_cert->cert, MBEDTLS_X509_KU_DIGITAL_SIGNATURE ) != 0 ||
|
|
mbedtls_x509_crt_check_extended_key_usage(
|
|
key_cert->cert, MBEDTLS_OID_SERVER_AUTH,
|
|
MBEDTLS_OID_SIZE( MBEDTLS_OID_SERVER_AUTH ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: "
|
|
"(extended) key usage extension" ) );
|
|
continue;
|
|
}
|
|
|
|
ret = mbedtls_ssl_tls13_get_sig_alg_from_pk(
|
|
ssl, &key_cert->cert->pk, &key_sig_alg );
|
|
if( ret != 0 )
|
|
continue;
|
|
if( *sig_alg == key_sig_alg )
|
|
{
|
|
ssl->handshake->key_cert = key_cert;
|
|
MBEDTLS_SSL_DEBUG_CRT(
|
|
3, "selected certificate (chain)",
|
|
ssl->handshake->key_cert->cert );
|
|
return( 0 );
|
|
}
|
|
}
|
|
}
|
|
|
|
return( -1 );
|
|
}
|
|
#endif /* MBEDTLS_X509_CRT_PARSE_C &&
|
|
MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
|
|
|
|
/*
|
|
*
|
|
* STATE HANDLING: ClientHello
|
|
*
|
|
* There are three possible classes of outcomes when parsing the ClientHello:
|
|
*
|
|
* 1) The ClientHello was well-formed and matched the server's configuration.
|
|
*
|
|
* In this case, the server progresses to sending its ServerHello.
|
|
*
|
|
* 2) The ClientHello was well-formed but didn't match the server's
|
|
* configuration.
|
|
*
|
|
* For example, the client might not have offered a key share which
|
|
* the server supports, or the server might require a cookie.
|
|
*
|
|
* In this case, the server sends a HelloRetryRequest.
|
|
*
|
|
* 3) The ClientHello was ill-formed
|
|
*
|
|
* In this case, we abort the handshake.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Structure of this message:
|
|
*
|
|
* uint16 ProtocolVersion;
|
|
* opaque Random[32];
|
|
* uint8 CipherSuite[2]; // Cryptographic suite selector
|
|
*
|
|
* struct {
|
|
* ProtocolVersion legacy_version = 0x0303; // TLS v1.2
|
|
* Random random;
|
|
* opaque legacy_session_id<0..32>;
|
|
* CipherSuite cipher_suites<2..2^16-2>;
|
|
* opaque legacy_compression_methods<1..2^8-1>;
|
|
* Extension extensions<8..2^16-1>;
|
|
* } ClientHello;
|
|
*/
|
|
|
|
#define SSL_CLIENT_HELLO_OK 0
|
|
#define SSL_CLIENT_HELLO_HRR_REQUIRED 1
|
|
|
|
static int ssl_tls13_parse_client_hello( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf,
|
|
const unsigned char *end )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
const unsigned char *p = buf;
|
|
size_t legacy_session_id_len;
|
|
const unsigned char *cipher_suites;
|
|
size_t cipher_suites_len;
|
|
const unsigned char *cipher_suites_end;
|
|
size_t extensions_len;
|
|
const unsigned char *extensions_end;
|
|
int hrr_required = 0;
|
|
|
|
const mbedtls_ssl_ciphersuite_t* ciphersuite_info;
|
|
|
|
ssl->handshake->extensions_present = MBEDTLS_SSL_EXT_NONE;
|
|
|
|
/*
|
|
* ClientHello layout:
|
|
* 0 . 1 protocol version
|
|
* 2 . 33 random bytes
|
|
* 34 . 34 session id length ( 1 byte )
|
|
* 35 . 34+x session id
|
|
* .. . .. ciphersuite list length ( 2 bytes )
|
|
* .. . .. ciphersuite list
|
|
* .. . .. compression alg. list length ( 1 byte )
|
|
* .. . .. compression alg. list
|
|
* .. . .. extensions length ( 2 bytes, optional )
|
|
* .. . .. extensions ( optional )
|
|
*/
|
|
|
|
/*
|
|
* Minimal length ( with everything empty and extensions omitted ) is
|
|
* 2 + 32 + 1 + 2 + 1 = 38 bytes. Check that first, so that we can
|
|
* read at least up to session id length without worrying.
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 38 );
|
|
|
|
/* ...
|
|
* ProtocolVersion legacy_version = 0x0303; // TLS 1.2
|
|
* ...
|
|
* with ProtocolVersion defined as:
|
|
* uint16 ProtocolVersion;
|
|
*/
|
|
if( mbedtls_ssl_read_version( p, ssl->conf->transport ) !=
|
|
MBEDTLS_SSL_VERSION_TLS1_2 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Unsupported version of TLS." ) );
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION,
|
|
MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION );
|
|
return ( MBEDTLS_ERR_SSL_BAD_PROTOCOL_VERSION );
|
|
}
|
|
p += 2;
|
|
|
|
/*
|
|
* Only support TLS 1.3 currently, temporarily set the version.
|
|
*/
|
|
ssl->tls_version = MBEDTLS_SSL_VERSION_TLS1_3;
|
|
|
|
/* ...
|
|
* Random random;
|
|
* ...
|
|
* with Random defined as:
|
|
* opaque Random[32];
|
|
*/
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes",
|
|
p, MBEDTLS_CLIENT_HELLO_RANDOM_LEN );
|
|
|
|
memcpy( &ssl->handshake->randbytes[0], p, MBEDTLS_CLIENT_HELLO_RANDOM_LEN );
|
|
p += MBEDTLS_CLIENT_HELLO_RANDOM_LEN;
|
|
|
|
/* ...
|
|
* opaque legacy_session_id<0..32>;
|
|
* ...
|
|
*/
|
|
legacy_session_id_len = p[0];
|
|
p++;
|
|
|
|
if( legacy_session_id_len > sizeof( ssl->session_negotiate->id ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
|
|
return( MBEDTLS_ERR_SSL_DECODE_ERROR );
|
|
}
|
|
|
|
ssl->session_negotiate->id_len = legacy_session_id_len;
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id",
|
|
p, legacy_session_id_len );
|
|
/*
|
|
* Check we have enough data for the legacy session identifier
|
|
* and the ciphersuite list length.
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, legacy_session_id_len + 2 );
|
|
|
|
memcpy( &ssl->session_negotiate->id[0], p, legacy_session_id_len );
|
|
p += legacy_session_id_len;
|
|
|
|
cipher_suites_len = MBEDTLS_GET_UINT16_BE( p, 0 );
|
|
p += 2;
|
|
|
|
/* Check we have enough data for the ciphersuite list, the legacy
|
|
* compression methods and the length of the extensions.
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, cipher_suites_len + 2 + 2 );
|
|
|
|
/* ...
|
|
* CipherSuite cipher_suites<2..2^16-2>;
|
|
* ...
|
|
* with CipherSuite defined as:
|
|
* uint8 CipherSuite[2];
|
|
*/
|
|
cipher_suites = p;
|
|
cipher_suites_end = p + cipher_suites_len;
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist",
|
|
p, cipher_suites_len );
|
|
/*
|
|
* Search for a matching ciphersuite
|
|
*/
|
|
int ciphersuite_match = 0;
|
|
for ( ; p < cipher_suites_end; p += 2 )
|
|
{
|
|
uint16_t cipher_suite;
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, cipher_suites_end, 2 );
|
|
cipher_suite = MBEDTLS_GET_UINT16_BE( p, 0 );
|
|
ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( cipher_suite );
|
|
/*
|
|
* Check whether this ciphersuite is valid and offered.
|
|
*/
|
|
if( ( mbedtls_ssl_validate_ciphersuite(
|
|
ssl, ciphersuite_info, ssl->tls_version,
|
|
ssl->tls_version ) != 0 ) ||
|
|
! mbedtls_ssl_tls13_cipher_suite_is_offered( ssl, cipher_suite ) )
|
|
{
|
|
continue;
|
|
}
|
|
|
|
ssl->session_negotiate->ciphersuite = cipher_suite;
|
|
ssl->handshake->ciphersuite_info = ciphersuite_info;
|
|
ciphersuite_match = 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if( ! ciphersuite_match )
|
|
{
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE,
|
|
MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
|
return ( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s",
|
|
ciphersuite_info->name ) );
|
|
|
|
p = cipher_suites + cipher_suites_len;
|
|
|
|
/* ...
|
|
* opaque legacy_compression_methods<1..2^8-1>;
|
|
* ...
|
|
*/
|
|
if( p[0] != 1 || p[1] != MBEDTLS_SSL_COMPRESS_NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad legacy compression method" ) );
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER,
|
|
MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
|
|
return ( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
|
|
}
|
|
p += 2;
|
|
|
|
/* ...
|
|
* Extension extensions<8..2^16-1>;
|
|
* ...
|
|
* with Extension defined as:
|
|
* struct {
|
|
* ExtensionType extension_type;
|
|
* opaque extension_data<0..2^16-1>;
|
|
* } Extension;
|
|
*/
|
|
extensions_len = MBEDTLS_GET_UINT16_BE( p, 0 );
|
|
p += 2;
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, extensions_len );
|
|
extensions_end = p + extensions_len;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "client hello extensions", p, extensions_len );
|
|
|
|
while( p < extensions_end )
|
|
{
|
|
unsigned int extension_type;
|
|
size_t extension_data_len;
|
|
const unsigned char *extension_data_end;
|
|
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, extensions_end, 4 );
|
|
extension_type = MBEDTLS_GET_UINT16_BE( p, 0 );
|
|
extension_data_len = MBEDTLS_GET_UINT16_BE( p, 2 );
|
|
p += 4;
|
|
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, extensions_end, extension_data_len );
|
|
extension_data_end = p + extension_data_len;
|
|
|
|
switch( extension_type )
|
|
{
|
|
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
case MBEDTLS_TLS_EXT_SERVERNAME:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ServerName extension" ) );
|
|
ret = mbedtls_ssl_parse_server_name_ext( ssl, p,
|
|
extension_data_end );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET(
|
|
1, "mbedtls_ssl_parse_servername_ext", ret );
|
|
return( ret );
|
|
}
|
|
ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SERVERNAME;
|
|
break;
|
|
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
|
|
|
|
#if defined(MBEDTLS_ECDH_C)
|
|
case MBEDTLS_TLS_EXT_SUPPORTED_GROUPS:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported group extension" ) );
|
|
|
|
/* Supported Groups Extension
|
|
*
|
|
* When sent by the client, the "supported_groups" extension
|
|
* indicates the named groups which the client supports,
|
|
* ordered from most preferred to least preferred.
|
|
*/
|
|
ret = ssl_tls13_parse_supported_groups_ext(
|
|
ssl, p, extension_data_end );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1,
|
|
"mbedtls_ssl_parse_supported_groups_ext", ret );
|
|
return( ret );
|
|
}
|
|
|
|
ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SUPPORTED_GROUPS;
|
|
break;
|
|
#endif /* MBEDTLS_ECDH_C */
|
|
|
|
#if defined(MBEDTLS_ECDH_C)
|
|
case MBEDTLS_TLS_EXT_KEY_SHARE:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found key share extension" ) );
|
|
|
|
/*
|
|
* Key Share Extension
|
|
*
|
|
* When sent by the client, the "key_share" extension
|
|
* contains the endpoint's cryptographic parameters for
|
|
* ECDHE/DHE key establishment methods.
|
|
*/
|
|
ret = ssl_tls13_parse_key_shares_ext(
|
|
ssl, p, extension_data_end );
|
|
if( ret == SSL_TLS1_3_PARSE_KEY_SHARES_EXT_NO_MATCH )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "HRR needed " ) );
|
|
hrr_required = 1;
|
|
}
|
|
|
|
if( ret < 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET(
|
|
1, "ssl_tls13_parse_key_shares_ext", ret );
|
|
return( ret );
|
|
}
|
|
|
|
ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_KEY_SHARE;
|
|
break;
|
|
#endif /* MBEDTLS_ECDH_C */
|
|
|
|
case MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported versions extension" ) );
|
|
|
|
ret = ssl_tls13_parse_supported_versions_ext(
|
|
ssl, p, extension_data_end );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1,
|
|
( "ssl_tls13_parse_supported_versions_ext" ), ret );
|
|
return( ret );
|
|
}
|
|
ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SUPPORTED_VERSIONS;
|
|
break;
|
|
|
|
#if defined(MBEDTLS_SSL_ALPN)
|
|
case MBEDTLS_TLS_EXT_ALPN:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) );
|
|
|
|
ret = mbedtls_ssl_parse_alpn_ext( ssl, p, extension_data_end );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET(
|
|
1, ( "mbedtls_ssl_parse_alpn_ext" ), ret );
|
|
return( ret );
|
|
}
|
|
ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_ALPN;
|
|
break;
|
|
#endif /* MBEDTLS_SSL_ALPN */
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
|
|
case MBEDTLS_TLS_EXT_SIG_ALG:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found signature_algorithms extension" ) );
|
|
|
|
ret = mbedtls_ssl_parse_sig_alg_ext(
|
|
ssl, p, extension_data_end );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1,
|
|
( "ssl_parse_supported_signature_algorithms_server_ext ( %d )",
|
|
ret ) );
|
|
return( ret );
|
|
}
|
|
ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SIG_ALG;
|
|
break;
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
|
|
|
|
default:
|
|
MBEDTLS_SSL_DEBUG_MSG( 3,
|
|
( "unknown extension found: %ud ( ignoring )",
|
|
extension_type ) );
|
|
}
|
|
|
|
p += extension_data_len;
|
|
}
|
|
|
|
/* Update checksum with either
|
|
* - The entire content of the CH message, if no PSK extension is present
|
|
* - The content up to but excluding the PSK extension, if present.
|
|
*/
|
|
mbedtls_ssl_add_hs_msg_to_checksum( ssl, MBEDTLS_SSL_HS_CLIENT_HELLO,
|
|
buf, p - buf );
|
|
|
|
/* List all the extensions we have received */
|
|
#if defined(MBEDTLS_DEBUG_C)
|
|
ssl_tls13_debug_print_client_hello_exts( ssl );
|
|
#endif /* MBEDTLS_DEBUG_C */
|
|
|
|
return( hrr_required ? SSL_CLIENT_HELLO_HRR_REQUIRED : SSL_CLIENT_HELLO_OK );
|
|
}
|
|
|
|
/* Update the handshake state machine */
|
|
|
|
static int ssl_tls13_postprocess_client_hello( mbedtls_ssl_context* ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
/*
|
|
* Here we only support the ephemeral or (EC)DHE key echange mode
|
|
*/
|
|
if( !ssl_tls13_check_ephemeral_key_exchange( ssl ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG(
|
|
1,
|
|
( "ClientHello message misses mandatory extensions." ) );
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_MISSING_EXTENSION ,
|
|
MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
|
|
return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
|
|
}
|
|
|
|
/*
|
|
* Server certificate selection
|
|
*/
|
|
if( ssl->conf->f_cert_cb && ( ret = ssl->conf->f_cert_cb( ssl ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "f_cert_cb", ret );
|
|
return( ret );
|
|
}
|
|
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
ssl->handshake->sni_name = NULL;
|
|
ssl->handshake->sni_name_len = 0;
|
|
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
|
|
|
|
ret = mbedtls_ssl_tls13_key_schedule_stage_early( ssl );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1,
|
|
"mbedtls_ssl_tls1_3_key_schedule_stage_early", ret );
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
|
|
}
|
|
|
|
/*
|
|
* Main entry point from the state machine; orchestrates the otherfunctions.
|
|
*/
|
|
|
|
static int ssl_tls13_process_client_hello( mbedtls_ssl_context *ssl )
|
|
{
|
|
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char* buf = NULL;
|
|
size_t buflen = 0;
|
|
int parse_client_hello_ret;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_tls13_fetch_handshake_msg(
|
|
ssl, MBEDTLS_SSL_HS_CLIENT_HELLO,
|
|
&buf, &buflen ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK_NEG( ssl_tls13_parse_client_hello( ssl, buf,
|
|
buf + buflen ) );
|
|
parse_client_hello_ret = ret; /* Store return value of parse_client_hello,
|
|
* only SSL_CLIENT_HELLO_OK or
|
|
* SSL_CLIENT_HELLO_HRR_REQUIRED at this
|
|
* stage as negative error codes are handled
|
|
* by MBEDTLS_SSL_PROC_CHK_NEG. */
|
|
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_postprocess_client_hello( ssl ) );
|
|
|
|
if( parse_client_hello_ret == SSL_CLIENT_HELLO_OK )
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_HELLO );
|
|
else
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HELLO_RETRY_REQUEST );
|
|
|
|
cleanup:
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) );
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* Handler for MBEDTLS_SSL_SERVER_HELLO
|
|
*/
|
|
static int ssl_tls13_prepare_server_hello( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char *server_randbytes =
|
|
ssl->handshake->randbytes + MBEDTLS_CLIENT_HELLO_RANDOM_LEN;
|
|
if( ssl->conf->f_rng == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided" ) );
|
|
return( MBEDTLS_ERR_SSL_NO_RNG );
|
|
}
|
|
|
|
if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, server_randbytes,
|
|
MBEDTLS_SERVER_HELLO_RANDOM_LEN ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "f_rng", ret );
|
|
return( ret );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", server_randbytes,
|
|
MBEDTLS_SERVER_HELLO_RANDOM_LEN );
|
|
|
|
#if defined(MBEDTLS_HAVE_TIME)
|
|
ssl->session_negotiate->start = time( NULL );
|
|
#endif /* MBEDTLS_HAVE_TIME */
|
|
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* ssl_tls13_write_server_hello_supported_versions_ext ():
|
|
*
|
|
* struct {
|
|
* ProtocolVersion selected_version;
|
|
* } SupportedVersions;
|
|
*/
|
|
static int ssl_tls13_write_server_hello_supported_versions_ext(
|
|
mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
unsigned char *end,
|
|
size_t *out_len )
|
|
{
|
|
*out_len = 0;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, write selected version" ) );
|
|
|
|
/* Check if we have space to write the extension:
|
|
* - extension_type (2 bytes)
|
|
* - extension_data_length (2 bytes)
|
|
* - selected_version (2 bytes)
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 6 );
|
|
|
|
MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS, buf, 0 );
|
|
|
|
MBEDTLS_PUT_UINT16_BE( 2, buf, 2 );
|
|
|
|
mbedtls_ssl_write_version( buf + 4,
|
|
ssl->conf->transport,
|
|
ssl->tls_version );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "supported version: [%04x]",
|
|
ssl->tls_version ) );
|
|
|
|
*out_len = 6;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
|
|
|
|
/* Generate and export a single key share. For hybrid KEMs, this can
|
|
* be called multiple times with the different components of the hybrid. */
|
|
static int ssl_tls13_generate_and_write_key_share( mbedtls_ssl_context *ssl,
|
|
uint16_t named_group,
|
|
unsigned char *buf,
|
|
unsigned char *end,
|
|
size_t *out_len )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
*out_len = 0;
|
|
|
|
#if defined(MBEDTLS_ECDH_C)
|
|
if( mbedtls_ssl_tls13_named_group_is_ecdhe( named_group ) )
|
|
{
|
|
ret = mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange(
|
|
ssl, named_group, buf, end, out_len );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET(
|
|
1, "mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange",
|
|
ret );
|
|
return( ret );
|
|
}
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_ECDH_C */
|
|
if( 0 /* Other kinds of KEMs */ )
|
|
{
|
|
}
|
|
else
|
|
{
|
|
((void) ssl);
|
|
((void) named_group);
|
|
((void) buf);
|
|
((void) end);
|
|
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
|
|
}
|
|
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* ssl_tls13_write_key_share_ext
|
|
*
|
|
* Structure of key_share extension in ServerHello:
|
|
*
|
|
* struct {
|
|
* NamedGroup group;
|
|
* opaque key_exchange<1..2^16-1>;
|
|
* } KeyShareEntry;
|
|
* struct {
|
|
* KeyShareEntry server_share;
|
|
* } KeyShareServerHello;
|
|
*/
|
|
static int ssl_tls13_write_key_share_ext( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
unsigned char *end,
|
|
size_t *out_len )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char *p = buf;
|
|
uint16_t group = ssl->handshake->offered_group_id;
|
|
unsigned char *server_share = buf + 4;
|
|
size_t key_exchange_length;
|
|
|
|
*out_len = 0;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding key share extension" ) );
|
|
|
|
/* Check if we have space for header and length fields:
|
|
* - extension_type (2 bytes)
|
|
* - extension_data_length (2 bytes)
|
|
* - group (2 bytes)
|
|
* - key_exchange_length (2 bytes)
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 8 );
|
|
MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_KEY_SHARE, p, 0 );
|
|
MBEDTLS_PUT_UINT16_BE( group, server_share, 0 );
|
|
p += 8;
|
|
|
|
/* When we introduce PQC-ECDHE hybrids, we'll want to call this
|
|
* function multiple times. */
|
|
ret = ssl_tls13_generate_and_write_key_share(
|
|
ssl, group, server_share + 4, end, &key_exchange_length );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
p += key_exchange_length;
|
|
|
|
MBEDTLS_PUT_UINT16_BE( key_exchange_length, server_share + 2, 0 );
|
|
|
|
MBEDTLS_PUT_UINT16_BE( p - server_share, buf, 2 );
|
|
|
|
*out_len = p - buf;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ssl_tls13_write_hrr_key_share_ext( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
unsigned char *end,
|
|
size_t *out_len )
|
|
{
|
|
uint16_t selected_group = ssl->handshake->hrr_selected_group;
|
|
/* key_share Extension
|
|
*
|
|
* struct {
|
|
* select (Handshake.msg_type) {
|
|
* ...
|
|
* case hello_retry_request:
|
|
* NamedGroup selected_group;
|
|
* ...
|
|
* };
|
|
* } KeyShare;
|
|
*/
|
|
|
|
*out_len = 0;
|
|
|
|
/*
|
|
* For a pure PSK key exchange, there is no group to agree upon. The purpose
|
|
* of the HRR is then to transmit a cookie to force the client to demonstrate
|
|
* reachability at their apparent network address (primarily useful for DTLS).
|
|
*/
|
|
if( ! mbedtls_ssl_tls13_some_ephemeral_enabled( ssl ) )
|
|
return( 0 );
|
|
|
|
/* We should only send the key_share extension if the client's initial
|
|
* key share was not acceptable. */
|
|
if( ssl->handshake->offered_group_id != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 4, ( "Skip key_share extension in HRR" ) );
|
|
return( 0 );
|
|
}
|
|
|
|
if( selected_group == 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "no matching named group found" ) );
|
|
return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
|
}
|
|
|
|
/* Check if we have enough space:
|
|
* - extension_type (2 bytes)
|
|
* - extension_data_length (2 bytes)
|
|
* - selected_group (2 bytes)
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 6 );
|
|
|
|
MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_KEY_SHARE, buf, 0 );
|
|
MBEDTLS_PUT_UINT16_BE( 2, buf, 2 );
|
|
MBEDTLS_PUT_UINT16_BE( selected_group, buf, 4 );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3,
|
|
( "HRR selected_group: %s (%x)",
|
|
mbedtls_ssl_named_group_to_str( selected_group ),
|
|
selected_group ) );
|
|
|
|
*out_len = 6;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Structure of ServerHello message:
|
|
*
|
|
* struct {
|
|
* ProtocolVersion legacy_version = 0x0303; // TLS v1.2
|
|
* Random random;
|
|
* opaque legacy_session_id_echo<0..32>;
|
|
* CipherSuite cipher_suite;
|
|
* uint8 legacy_compression_method = 0;
|
|
* Extension extensions<6..2^16-1>;
|
|
* } ServerHello;
|
|
*/
|
|
static int ssl_tls13_write_server_hello_body( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
unsigned char *end,
|
|
size_t *out_len,
|
|
int is_hrr )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char *p = buf;
|
|
unsigned char *p_extensions_len;
|
|
size_t output_len;
|
|
|
|
*out_len = 0;
|
|
|
|
/* ...
|
|
* ProtocolVersion legacy_version = 0x0303; // TLS 1.2
|
|
* ...
|
|
* with ProtocolVersion defined as:
|
|
* uint16 ProtocolVersion;
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
|
|
MBEDTLS_PUT_UINT16_BE( 0x0303, p, 0 );
|
|
p += 2;
|
|
|
|
/* ...
|
|
* Random random;
|
|
* ...
|
|
* with Random defined as:
|
|
* opaque Random[MBEDTLS_SERVER_HELLO_RANDOM_LEN];
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_PTR( p, end, MBEDTLS_SERVER_HELLO_RANDOM_LEN );
|
|
if( is_hrr )
|
|
{
|
|
memcpy( p, mbedtls_ssl_tls13_hello_retry_request_magic,
|
|
MBEDTLS_SERVER_HELLO_RANDOM_LEN );
|
|
}
|
|
else
|
|
{
|
|
memcpy( p, &ssl->handshake->randbytes[MBEDTLS_CLIENT_HELLO_RANDOM_LEN],
|
|
MBEDTLS_SERVER_HELLO_RANDOM_LEN );
|
|
}
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes",
|
|
p, MBEDTLS_SERVER_HELLO_RANDOM_LEN );
|
|
p += MBEDTLS_SERVER_HELLO_RANDOM_LEN;
|
|
|
|
/* ...
|
|
* opaque legacy_session_id_echo<0..32>;
|
|
* ...
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 1 + ssl->session_negotiate->id_len );
|
|
*p++ = (unsigned char)ssl->session_negotiate->id_len;
|
|
if( ssl->session_negotiate->id_len > 0 )
|
|
{
|
|
memcpy( p, &ssl->session_negotiate->id[0],
|
|
ssl->session_negotiate->id_len );
|
|
p += ssl->session_negotiate->id_len;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "session id", ssl->session_negotiate->id,
|
|
ssl->session_negotiate->id_len );
|
|
}
|
|
|
|
/* ...
|
|
* CipherSuite cipher_suite;
|
|
* ...
|
|
* with CipherSuite defined as:
|
|
* uint8 CipherSuite[2];
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
|
|
MBEDTLS_PUT_UINT16_BE( ssl->session_negotiate->ciphersuite, p, 0 );
|
|
p += 2;
|
|
MBEDTLS_SSL_DEBUG_MSG( 3,
|
|
( "server hello, chosen ciphersuite: %s ( id=%d )",
|
|
mbedtls_ssl_get_ciphersuite_name(
|
|
ssl->session_negotiate->ciphersuite ),
|
|
ssl->session_negotiate->ciphersuite ) );
|
|
|
|
/* ...
|
|
* uint8 legacy_compression_method = 0;
|
|
* ...
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 1 );
|
|
*p++ = 0x0;
|
|
|
|
/* ...
|
|
* Extension extensions<6..2^16-1>;
|
|
* ...
|
|
* struct {
|
|
* ExtensionType extension_type; (2 bytes)
|
|
* opaque extension_data<0..2^16-1>;
|
|
* } Extension;
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
|
|
p_extensions_len = p;
|
|
p += 2;
|
|
|
|
if( ( ret = ssl_tls13_write_server_hello_supported_versions_ext(
|
|
ssl, p, end, &output_len ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET(
|
|
1, "ssl_tls13_write_server_hello_supported_versions_ext", ret );
|
|
return( ret );
|
|
}
|
|
p += output_len;
|
|
|
|
if( mbedtls_ssl_conf_tls13_some_ephemeral_enabled( ssl ) )
|
|
{
|
|
if( is_hrr )
|
|
ret = ssl_tls13_write_hrr_key_share_ext( ssl, p, end, &output_len );
|
|
else
|
|
ret = ssl_tls13_write_key_share_ext( ssl, p, end, &output_len );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
p += output_len;
|
|
}
|
|
|
|
MBEDTLS_PUT_UINT16_BE( p - p_extensions_len - 2, p_extensions_len, 0 );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "server hello extensions",
|
|
p_extensions_len, p - p_extensions_len );
|
|
|
|
*out_len = p - buf;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "server hello", buf, *out_len );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
static int ssl_tls13_finalize_write_server_hello( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
ret = mbedtls_ssl_tls13_compute_handshake_transform( ssl );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1,
|
|
"mbedtls_ssl_tls13_compute_handshake_transform",
|
|
ret );
|
|
return( ret );
|
|
}
|
|
|
|
return( ret );
|
|
}
|
|
|
|
static int ssl_tls13_write_server_hello( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char *buf;
|
|
size_t buf_len, msg_len;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello" ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_prepare_server_hello( ssl ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( ssl,
|
|
MBEDTLS_SSL_HS_SERVER_HELLO, &buf, &buf_len ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_server_hello_body( ssl, buf,
|
|
buf + buf_len,
|
|
&msg_len,
|
|
0 ) );
|
|
|
|
mbedtls_ssl_add_hs_msg_to_checksum(
|
|
ssl, MBEDTLS_SSL_HS_SERVER_HELLO, buf, msg_len );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg(
|
|
ssl, buf_len, msg_len ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_finalize_write_server_hello( ssl ) );
|
|
|
|
#if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE)
|
|
/* The server sends a dummy change_cipher_spec record immediately
|
|
* after its first handshake message. This may either be after
|
|
* a ServerHello or a HelloRetryRequest.
|
|
*/
|
|
mbedtls_ssl_handshake_set_state(
|
|
ssl, MBEDTLS_SSL_SERVER_CCS_AFTER_SERVER_HELLO );
|
|
#else
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_ENCRYPTED_EXTENSIONS );
|
|
#endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */
|
|
|
|
cleanup:
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) );
|
|
return( ret );
|
|
}
|
|
|
|
|
|
/*
|
|
* Handler for MBEDTLS_SSL_HELLO_RETRY_REQUEST
|
|
*/
|
|
static int ssl_tls13_prepare_hello_retry_request( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
if( ssl->handshake->hello_retry_request_count > 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Too many HRRs" ) );
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE,
|
|
MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
|
return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
|
}
|
|
|
|
/*
|
|
* Create stateless transcript hash for HRR
|
|
*/
|
|
MBEDTLS_SSL_DEBUG_MSG( 4, ( "Reset transcript for HRR" ) );
|
|
ret = mbedtls_ssl_reset_transcript_for_hrr( ssl );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_reset_transcript_for_hrr", ret );
|
|
return( ret );
|
|
}
|
|
mbedtls_ssl_session_reset_msg_layer( ssl, 0 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ssl_tls13_write_hello_retry_request( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char *buf;
|
|
size_t buf_len, msg_len;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello retry request" ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_prepare_hello_retry_request( ssl ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg(
|
|
ssl, MBEDTLS_SSL_HS_SERVER_HELLO,
|
|
&buf, &buf_len ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_server_hello_body( ssl, buf,
|
|
buf + buf_len,
|
|
&msg_len,
|
|
1 ) );
|
|
mbedtls_ssl_add_hs_msg_to_checksum(
|
|
ssl, MBEDTLS_SSL_HS_SERVER_HELLO, buf, msg_len );
|
|
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg( ssl, buf_len,
|
|
msg_len ) );
|
|
|
|
ssl->handshake->hello_retry_request_count++;
|
|
|
|
#if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE)
|
|
/* The server sends a dummy change_cipher_spec record immediately
|
|
* after its first handshake message. This may either be after
|
|
* a ServerHello or a HelloRetryRequest.
|
|
*/
|
|
mbedtls_ssl_handshake_set_state(
|
|
ssl, MBEDTLS_SSL_SERVER_CCS_AFTER_HELLO_RETRY_REQUEST );
|
|
#else
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_HELLO );
|
|
#endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */
|
|
|
|
cleanup:
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello retry request" ) );
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* Handler for MBEDTLS_SSL_ENCRYPTED_EXTENSIONS
|
|
*/
|
|
|
|
/*
|
|
* struct {
|
|
* Extension extensions<0..2 ^ 16 - 1>;
|
|
* } EncryptedExtensions;
|
|
*
|
|
*/
|
|
static int ssl_tls13_write_encrypted_extensions_body( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
unsigned char *end,
|
|
size_t *out_len )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char *p = buf;
|
|
size_t extensions_len = 0;
|
|
unsigned char *p_extensions_len;
|
|
size_t output_len;
|
|
|
|
*out_len = 0;
|
|
|
|
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
|
|
p_extensions_len = p;
|
|
p += 2;
|
|
|
|
((void) ssl);
|
|
((void) ret);
|
|
((void) output_len);
|
|
|
|
#if defined(MBEDTLS_SSL_ALPN)
|
|
ret = mbedtls_ssl_write_alpn_ext( ssl, p, end, &output_len );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
p += output_len;
|
|
#endif /* MBEDTLS_SSL_ALPN */
|
|
|
|
extensions_len = ( p - p_extensions_len ) - 2;
|
|
MBEDTLS_PUT_UINT16_BE( extensions_len, p_extensions_len, 0 );
|
|
|
|
*out_len = p - buf;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "encrypted extensions", buf, *out_len );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ssl_tls13_write_encrypted_extensions( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char *buf;
|
|
size_t buf_len, msg_len;
|
|
|
|
mbedtls_ssl_set_outbound_transform( ssl,
|
|
ssl->handshake->transform_handshake );
|
|
MBEDTLS_SSL_DEBUG_MSG(
|
|
3, ( "switching to handshake transform for outbound data" ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write encrypted extensions" ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( ssl,
|
|
MBEDTLS_SSL_HS_ENCRYPTED_EXTENSIONS, &buf, &buf_len ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_encrypted_extensions_body(
|
|
ssl, buf, buf + buf_len, &msg_len ) );
|
|
|
|
mbedtls_ssl_add_hs_msg_to_checksum(
|
|
ssl, MBEDTLS_SSL_HS_ENCRYPTED_EXTENSIONS, buf, msg_len );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg(
|
|
ssl, buf_len, msg_len ) );
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
|
|
if( mbedtls_ssl_tls13_some_psk_enabled( ssl ) )
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_FINISHED );
|
|
else
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CERTIFICATE_REQUEST );
|
|
#else
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_FINISHED );
|
|
#endif
|
|
|
|
cleanup:
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write encrypted extensions" ) );
|
|
return( ret );
|
|
}
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
|
|
#define SSL_CERTIFICATE_REQUEST_SEND_REQUEST 0
|
|
#define SSL_CERTIFICATE_REQUEST_SKIP 1
|
|
/* Coordination:
|
|
* Check whether a CertificateRequest message should be written.
|
|
* Returns a negative code on failure, or
|
|
* - SSL_CERTIFICATE_REQUEST_SEND_REQUEST
|
|
* - SSL_CERTIFICATE_REQUEST_SKIP
|
|
* indicating if the writing of the CertificateRequest
|
|
* should be skipped or not.
|
|
*/
|
|
static int ssl_tls13_certificate_request_coordinate( mbedtls_ssl_context *ssl )
|
|
{
|
|
int authmode;
|
|
|
|
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET )
|
|
authmode = ssl->handshake->sni_authmode;
|
|
else
|
|
#endif
|
|
authmode = ssl->conf->authmode;
|
|
|
|
if( authmode == MBEDTLS_SSL_VERIFY_NONE )
|
|
return( SSL_CERTIFICATE_REQUEST_SKIP );
|
|
|
|
ssl->handshake->certificate_request_sent = 1;
|
|
|
|
return( SSL_CERTIFICATE_REQUEST_SEND_REQUEST );
|
|
}
|
|
|
|
/*
|
|
* struct {
|
|
* opaque certificate_request_context<0..2^8-1>;
|
|
* Extension extensions<2..2^16-1>;
|
|
* } CertificateRequest;
|
|
*
|
|
*/
|
|
static int ssl_tls13_write_certificate_request_body( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
const unsigned char *end,
|
|
size_t *out_len )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char *p = buf;
|
|
size_t output_len = 0;
|
|
unsigned char *p_extensions_len;
|
|
|
|
*out_len = 0;
|
|
|
|
/* Check if we have enough space:
|
|
* - certificate_request_context (1 byte)
|
|
* - extensions length (2 bytes)
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 3 );
|
|
|
|
/*
|
|
* Write certificate_request_context
|
|
*/
|
|
/*
|
|
* We use a zero length context for the normal handshake
|
|
* messages. For post-authentication handshake messages
|
|
* this request context would be set to a non-zero value.
|
|
*/
|
|
*p++ = 0x0;
|
|
|
|
/*
|
|
* Write extensions
|
|
*/
|
|
/* The extensions must contain the signature_algorithms. */
|
|
p_extensions_len = p;
|
|
p += 2;
|
|
ret = mbedtls_ssl_write_sig_alg_ext( ssl, p, end, &output_len );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
p += output_len;
|
|
MBEDTLS_PUT_UINT16_BE( p - p_extensions_len - 2, p_extensions_len, 0 );
|
|
|
|
*out_len = p - buf;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ssl_tls13_write_certificate_request( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK_NEG( ssl_tls13_certificate_request_coordinate( ssl ) );
|
|
|
|
if( ret == SSL_CERTIFICATE_REQUEST_SEND_REQUEST )
|
|
{
|
|
unsigned char *buf;
|
|
size_t buf_len, msg_len;
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( ssl,
|
|
MBEDTLS_SSL_HS_CERTIFICATE_REQUEST, &buf, &buf_len ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_certificate_request_body(
|
|
ssl, buf, buf + buf_len, &msg_len ) );
|
|
|
|
mbedtls_ssl_add_hs_msg_to_checksum(
|
|
ssl, MBEDTLS_SSL_HS_CERTIFICATE_REQUEST, buf, msg_len );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg(
|
|
ssl, buf_len, msg_len ) );
|
|
}
|
|
else if( ret == SSL_CERTIFICATE_REQUEST_SKIP )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
|
|
ret = 0;
|
|
}
|
|
else
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
|
|
goto cleanup;
|
|
}
|
|
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_CERTIFICATE );
|
|
cleanup:
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) );
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* Handler for MBEDTLS_SSL_SERVER_CERTIFICATE
|
|
*/
|
|
static int ssl_tls13_write_server_certificate( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
#if defined(MBEDTLS_X509_CRT_PARSE_C)
|
|
if( ( ssl_tls13_pick_key_cert( ssl ) != 0 ) ||
|
|
mbedtls_ssl_own_cert( ssl ) == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "No certificate available." ) );
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE,
|
|
MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE);
|
|
return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
|
}
|
|
#endif /* MBEDTLS_X509_CRT_PARSE_C */
|
|
|
|
ret = mbedtls_ssl_tls13_write_certificate( ssl );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CERTIFICATE_VERIFY );
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Handler for MBEDTLS_SSL_CERTIFICATE_VERIFY
|
|
*/
|
|
static int ssl_tls13_write_certificate_verify( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = mbedtls_ssl_tls13_write_certificate_verify( ssl );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_SERVER_FINISHED );
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
|
|
|
|
/*
|
|
* Handler for MBEDTLS_SSL_SERVER_FINISHED
|
|
*/
|
|
static int ssl_tls13_write_server_finished( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
ret = mbedtls_ssl_tls13_write_finished_message( ssl );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
ret = mbedtls_ssl_tls13_compute_application_transform( ssl );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT(
|
|
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE,
|
|
MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
|
return( ret );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Switch to handshake keys for inbound traffic" ) );
|
|
mbedtls_ssl_set_inbound_transform( ssl, ssl->handshake->transform_handshake );
|
|
|
|
if( ssl->handshake->certificate_request_sent )
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_CERTIFICATE );
|
|
else
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "skip parse certificate" ) );
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "skip parse certificate verify" ) );
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_FINISHED );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Handler for MBEDTLS_SSL_CLIENT_FINISHED
|
|
*/
|
|
static int ssl_tls13_process_client_finished( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
ret = mbedtls_ssl_tls13_process_finished_message( ssl );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
ret = mbedtls_ssl_tls13_generate_resumption_master_secret( ssl );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1,
|
|
"mbedtls_ssl_tls13_generate_resumption_master_secret ", ret );
|
|
}
|
|
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HANDSHAKE_WRAPUP );
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Handler for MBEDTLS_SSL_HANDSHAKE_WRAPUP
|
|
*/
|
|
static int ssl_tls13_handshake_wrapup( mbedtls_ssl_context *ssl )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
|
|
|
|
mbedtls_ssl_tls13_handshake_wrapup( ssl );
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HANDSHAKE_OVER );
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* TLS 1.3 State Machine -- server side
|
|
*/
|
|
int mbedtls_ssl_tls13_handshake_server_step( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "tls13 server state: %s(%d)",
|
|
mbedtls_ssl_states_str( ssl->state ),
|
|
ssl->state ) );
|
|
|
|
switch( ssl->state )
|
|
{
|
|
/* start state */
|
|
case MBEDTLS_SSL_HELLO_REQUEST:
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_HELLO );
|
|
ret = 0;
|
|
break;
|
|
|
|
case MBEDTLS_SSL_CLIENT_HELLO:
|
|
ret = ssl_tls13_process_client_hello( ssl );
|
|
if( ret != 0 )
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_tls13_process_client_hello", ret );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_HELLO_RETRY_REQUEST:
|
|
ret = ssl_tls13_write_hello_retry_request( ssl );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_tls13_write_hello_retry_request", ret );
|
|
return( ret );
|
|
}
|
|
break;
|
|
|
|
case MBEDTLS_SSL_SERVER_HELLO:
|
|
ret = ssl_tls13_write_server_hello( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_ENCRYPTED_EXTENSIONS:
|
|
ret = ssl_tls13_write_encrypted_extensions( ssl );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_tls13_write_encrypted_extensions", ret );
|
|
return( ret );
|
|
}
|
|
break;
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
|
|
case MBEDTLS_SSL_CERTIFICATE_REQUEST:
|
|
ret = ssl_tls13_write_certificate_request( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_SERVER_CERTIFICATE:
|
|
ret = ssl_tls13_write_server_certificate( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_CERTIFICATE_VERIFY:
|
|
ret = ssl_tls13_write_certificate_verify( ssl );
|
|
break;
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
|
|
|
|
/*
|
|
* Injection of dummy-CCS's for middlebox compatibility
|
|
*/
|
|
#if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE)
|
|
case MBEDTLS_SSL_SERVER_CCS_AFTER_HELLO_RETRY_REQUEST:
|
|
ret = mbedtls_ssl_tls13_write_change_cipher_spec( ssl );
|
|
if( ret == 0 )
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_HELLO );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_SERVER_CCS_AFTER_SERVER_HELLO:
|
|
ret = mbedtls_ssl_tls13_write_change_cipher_spec( ssl );
|
|
if( ret == 0 )
|
|
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_ENCRYPTED_EXTENSIONS );
|
|
break;
|
|
#endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */
|
|
|
|
case MBEDTLS_SSL_SERVER_FINISHED:
|
|
ret = ssl_tls13_write_server_finished( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_CLIENT_FINISHED:
|
|
ret = ssl_tls13_process_client_finished( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_HANDSHAKE_WRAPUP:
|
|
ret = ssl_tls13_handshake_wrapup( ssl );
|
|
break;
|
|
|
|
case MBEDTLS_SSL_CLIENT_CERTIFICATE:
|
|
ret = mbedtls_ssl_tls13_process_certificate( ssl );
|
|
if( ret == 0 )
|
|
{
|
|
if( ssl->session_negotiate->peer_cert != NULL )
|
|
{
|
|
mbedtls_ssl_handshake_set_state(
|
|
ssl, MBEDTLS_SSL_CLIENT_CERTIFICATE_VERIFY );
|
|
}
|
|
else
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "skip parse certificate verify" ) );
|
|
mbedtls_ssl_handshake_set_state(
|
|
ssl, MBEDTLS_SSL_CLIENT_FINISHED );
|
|
}
|
|
}
|
|
break;
|
|
|
|
case MBEDTLS_SSL_CLIENT_CERTIFICATE_VERIFY:
|
|
ret = mbedtls_ssl_tls13_process_certificate_verify( ssl );
|
|
if( ret == 0 )
|
|
{
|
|
mbedtls_ssl_handshake_set_state(
|
|
ssl, MBEDTLS_SSL_CLIENT_FINISHED );
|
|
}
|
|
break;
|
|
|
|
default:
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
|
|
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
}
|
|
|
|
return( ret );
|
|
}
|
|
|
|
#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_PROTO_TLS1_3 */
|