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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_header PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes an NX_PACKET data structure, extracting */
/* and parsing a TLS header received from a remote host. */
/* */
/* INPUT */
/* */
/* tls_session Pointer to TLS control block */
/* packet_ptr Pointer to incoming packet */
/* record_offset Offset of current record */
/* message_type Return message type value */
/* length Return message length value */
/* header_data Pointer to header to parse */
/* header_length Length of header data (bytes) */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* nx_packet_data_extract_offset Extract data from NX_PACKET */
/* _nx_secure_tls_check_protocol_version Check incoming TLS version */
/* */
/* CALLED BY */
/* */
/* _nx_secure_tls_process_record Process TLS record */
/* */
/**************************************************************************/
UINT _nx_secure_tls_process_header(NX_SECURE_TLS_SESSION *tls_session, NX_PACKET *packet_ptr,
ULONG record_offset, USHORT *message_type, UINT *length,
UCHAR *header_data, USHORT *header_length)
{
ULONG bytes_copied;
UINT status;
USHORT protocol_version;
/* Check the packet. */
if (packet_ptr == NX_NULL)
{
/* There was an error in extracting the header from the supplied packet. */
return(NX_SECURE_TLS_INVALID_PACKET);
}
/* Process the TLS record header, which will set the state. */
status = nx_packet_data_extract_offset(packet_ptr, record_offset, header_data,
NX_SECURE_TLS_RECORD_HEADER_SIZE, &bytes_copied);
/* Make sure we actually got a header. */
if (status != NX_SUCCESS)
{
/* There was an error in extracting the header from the supplied packet. */
return(NX_SECURE_TLS_INVALID_PACKET);
}
if (bytes_copied != NX_SECURE_TLS_RECORD_HEADER_SIZE)
{
/* Wait more TCP packets for this one record. */
return(NX_CONTINUE);
}
/* Extract message type from packet/record. */
*message_type = header_data[0];
/* Extract the protocol version. */
protocol_version = (USHORT)(((USHORT)header_data[1] << 8) | header_data[2]);
/* Get the length of the TLS data. */
*length = (UINT)(((UINT)header_data[3] << 8) + header_data[4]);
/* Set header length. */
*header_length = NX_SECURE_TLS_RECORD_HEADER_SIZE;
/* Check the protocol version, except when we haven't established a version yet */
if (tls_session -> nx_secure_tls_protocol_version != 0)
{
/* Check the record's protocol version against the current session. */
status = _nx_secure_tls_check_protocol_version(tls_session, protocol_version, NX_SECURE_TLS);
return(status);
}
return(NX_SUCCESS);
}
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