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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2025-present Eclipse ThreadX Contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Secure Component */
/** */
/** Transport Layer Security (TLS) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SECURE_SOURCE_CODE
#include "nx_secure_tls.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_tls_process_server_key_exchange PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes an incoming ServerKeyExchange message, */
/* which is sent by the remote TLS Server host when certain */
/* ciphersuites (e.g. those using Diffie-Hellman) are used. */
/* */
/* INPUT */
/* */
/* tls_session TLS control block */
/* packet_buffer Pointer to message data */
/* message_length Length of message data (bytes)*/
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_secure_tls_find_curve_method Find named curve used */
/* _nx_secure_x509_remote_endpoint_certificate_get */
/* Get remote host certificate */
/* _nx_secure_x509_find_certificate_methods */
/* Find certificate methods */
/* _nx_secure_x509_pkcs7_decode Decode the PKCS#7 signature */
/* [nx_crypto_init] Crypto initialization */
/* [nx_crypto_operation] Crypto operation */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_client_handshake DTLS client state machine */
/* _nx_secure_tls_client_handshake TLS client state machine */
/* */
/**************************************************************************/
UINT _nx_secure_tls_process_server_key_exchange(NX_SECURE_TLS_SESSION *tls_session,
UCHAR *packet_buffer, UINT message_length)
{
#if !defined(NX_SECURE_TLS_CLIENT_DISABLED)
UINT status;
#if defined(NX_SECURE_ENABLE_PSK_CIPHERSUITES) || defined(NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE) || \
(defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE))
const NX_SECURE_TLS_CIPHERSUITE_INFO *ciphersuite;
#if defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE)
#ifdef NX_SECURE_ENABLE_PSK_CIPHERSUITES
UINT auth_algorithm;
#endif
NX_SECURE_TLS_CLIENT_STATE client_state;
#endif /* defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE) */
#endif /* defined(NX_SECURE_ENABLE_PSK_CIPHERSUITES) || defined(NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE) || \
defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE) */
#if defined(NX_SECURE_ENABLE_PSK_CIPHERSUITES) || defined(NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE) || \
(defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE))
/* Figure out which ciphersuite we are using. */
ciphersuite = tls_session -> nx_secure_tls_session_ciphersuite;
if (ciphersuite == NX_NULL)
{
/* Likely internal error since at this point ciphersuite negotiation was theoretically completed. */
return(NX_SECURE_TLS_UNKNOWN_CIPHERSUITE);
}
#endif /* defined(NX_SECURE_ENABLE_PSK_CIPHERSUITES) || defined(NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE) */
#if defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE)
if (ciphersuite -> nx_secure_tls_public_cipher -> nx_crypto_algorithm == NX_CRYPTO_KEY_EXCHANGE_ECDHE)
{
#ifdef NX_SECURE_ENABLE_PSK_CIPHERSUITES
auth_algorithm = ciphersuite->nx_secure_tls_public_auth->nx_crypto_algorithm;
#endif
client_state = tls_session->nx_secure_tls_client_state;
if (
#ifdef NX_SECURE_ENABLE_PSK_CIPHERSUITES
auth_algorithm != NX_CRYPTO_KEY_EXCHANGE_PSK &&
#endif
client_state != NX_SECURE_TLS_CLIENT_STATE_SERVER_CERTIFICATE)
{
return(NX_SECURE_TLS_UNEXPECTED_MESSAGE);
}
tls_session -> nx_secure_tls_client_state = NX_SECURE_TLS_CLIENT_STATE_SERVER_KEY_EXCHANGE;
}
status = tls_session -> nx_secure_process_server_key_exchange(tls_session -> nx_secure_tls_session_ciphersuite, tls_session -> nx_secure_tls_crypto_table,
tls_session -> nx_secure_tls_protocol_version, packet_buffer, message_length,
&tls_session -> nx_secure_tls_key_material, &tls_session -> nx_secure_tls_credentials,
&tls_session -> nx_secure_tls_handshake_hash, tls_session -> nx_secure_public_cipher_metadata_area,
tls_session -> nx_secure_public_cipher_metadata_size,
tls_session -> nx_secure_public_auth_metadata_area, tls_session -> nx_secure_public_auth_metadata_size,
&tls_session -> nx_secure_tls_ecc);
#else
status = tls_session -> nx_secure_process_server_key_exchange(tls_session -> nx_secure_tls_session_ciphersuite, tls_session -> nx_secure_tls_crypto_table,
tls_session -> nx_secure_tls_protocol_version, packet_buffer, message_length,
&tls_session -> nx_secure_tls_key_material, &tls_session -> nx_secure_tls_credentials,
&tls_session -> nx_secure_tls_handshake_hash, tls_session -> nx_secure_public_cipher_metadata_area,
tls_session -> nx_secure_public_cipher_metadata_size,
tls_session -> nx_secure_public_auth_metadata_area, tls_session -> nx_secure_public_auth_metadata_size,
NX_NULL);
#endif /* defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE) */
return(status);
#else /* !define(NX_SECURE_TLS_CLIENT_DISABLED) */
/* If Client TLS is disabled and we recieve a server key exchange, error! */
NX_PARAMETER_NOT_USED(tls_session);
NX_PARAMETER_NOT_USED(packet_buffer);
NX_PARAMETER_NOT_USED(message_length);
return(NX_SECURE_TLS_UNEXPECTED_MESSAGE);
#endif
}
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