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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_send_alert PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function populates an NX_PACKET with a TLS Alert message, */
/* which indicates an error (and possible security breach) has been */
/* detected. The alert notifies the remote host of the error. */
/* */
/* INPUT */
/* */
/* tls_session TLS control block */
/* send_packet Packet to be filled */
/* alert_number TLS alert number */
/* alert_level TLS alert severity */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_client_handshake DTLS client state machine */
/* _nx_secure_dtls_server_handshake DTLS server state machine */
/* _nx_secure_dtls_session_end End of a session */
/* _nx_secure_dtls_session_receive Receive DTLS data */
/* _nx_secure_tls_client_handshake TLS client state machine */
/* _nx_secure_tls_server_handshake TLS server state machine */
/* _nx_secure_tls_session_end End of a session */
/* _nx_secure_tls_session_receive_records */
/* Receive TLS records */
/* */
/**************************************************************************/
VOID _nx_secure_tls_send_alert(NX_SECURE_TLS_SESSION *tls_session, NX_PACKET *send_packet,
UCHAR alert_number, UCHAR alert_level)
{
#ifndef NX_SECURE_TLS_CLIENT_DISABLED
if (tls_session -> nx_secure_tls_socket_type == NX_SECURE_TLS_SESSION_TYPE_CLIENT)
{
tls_session -> nx_secure_tls_client_state = NX_SECURE_TLS_CLIENT_STATE_ALERT_SENT;
}
#endif
#ifndef NX_SECURE_TLS_SERVER_DISABLED
if (tls_session -> nx_secure_tls_socket_type == NX_SECURE_TLS_SESSION_TYPE_SERVER)
{
tls_session -> nx_secure_tls_server_state = NX_SECURE_TLS_SERVER_STATE_ALERT_SENT;
}
#endif
/* Populate the buffer with the alert level and alert number to send to the remote host. */
send_packet -> nx_packet_append_ptr[0] = alert_level;
send_packet -> nx_packet_append_ptr[1] = alert_number;
/* Make sure the caller has the right length of data to send. */
send_packet -> nx_packet_append_ptr = send_packet -> nx_packet_append_ptr + 2;
send_packet -> nx_packet_length = 2;
}
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