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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Secure Component */
/** */
/** Transport Layer Security (TLS) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SECURE_SOURCE_CODE
#include "nx_secure_tls.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_tls_session_reset PORTABLE C */
/* 6.1.9 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function resets a TLS session object, clearing out all data */
/* for initialization or re-use. */
/* */
/* INPUT */
/* */
/* tls_session TLS control block */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_secure_tls_key_material_init Clear TLS key material */
/* _nx_secure_tls_remote_certificate_free_all */
/* Free all remote certificates */
/* tx_mutex_get Get protection mutex */
/* tx_mutex_put Put protection mutex */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* _nx_secure_dtls_session_reset Clear out the session */
/* _nx_secure_tls_session_create Create the TLS session */
/* _nx_secure_tls_session_delete Delete the TLS session */
/* _nx_secure_tls_session_end End of a session */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* fixed renegotiation bug, */
/* resulting in version 6.1 */
/* 08-02-2021 Timothy Stapko Modified comment(s), added */
/* cleanup for session cipher, */
/* resulting in version 6.1.8 */
/* 10-15-2021 Timothy Stapko Modified comment(s), added */
/* option to disable client */
/* initiated renegotiation, */
/* resulting in version 6.1.9 */
/* */
/**************************************************************************/
UINT _nx_secure_tls_session_reset(NX_SECURE_TLS_SESSION *session_ptr)
{
UINT status;
UINT temp_status;
status = NX_SUCCESS;
/* Get the protection. */
tx_mutex_get(&_nx_secure_tls_protection, TX_WAIT_FOREVER);
/* Reset all state to bring the TLS socket back to an initial state, leaving
* it as it was when created, but leaving certain items alone:
* - packet pool
* - local and trusted certificates
* - callback functions
* - crypto table and metadata
*
* Remote certificates must be freed (placed back into free store)
*/
if (session_ptr -> nx_secure_tls_remote_session_active)
{
if (session_ptr -> nx_secure_tls_session_ciphersuite != NX_NULL)
{
if (session_ptr -> nx_secure_tls_session_ciphersuite -> nx_secure_tls_session_cipher -> nx_crypto_cleanup)
{
temp_status = session_ptr -> nx_secure_tls_session_ciphersuite -> nx_secure_tls_session_cipher -> nx_crypto_cleanup(session_ptr -> nx_secure_session_cipher_metadata_area_client);
if(temp_status != NX_CRYPTO_SUCCESS)
{
status = temp_status;
}
temp_status = session_ptr -> nx_secure_tls_session_ciphersuite -> nx_secure_tls_session_cipher -> nx_crypto_cleanup(session_ptr -> nx_secure_session_cipher_metadata_area_server);
if(temp_status != NX_CRYPTO_SUCCESS)
{
status = temp_status;
}
}
}
}
/* Reset socket type. */
session_ptr -> nx_secure_tls_socket_type = NX_SECURE_TLS_SESSION_TYPE_NONE;
/* Clear out the protocol version - assigned during the TLS handshake. */
session_ptr -> nx_secure_tls_protocol_version = 0;
/* Sessions are not active when we start the socket. */
session_ptr -> nx_secure_tls_remote_session_active = 0;
session_ptr -> nx_secure_tls_local_session_active = 0;
session_ptr -> nx_secure_tls_session_cipher_client_initialized = 0;
session_ptr -> nx_secure_tls_session_cipher_server_initialized = 0;
/* Set the current ciphersuite to TLS_NULL_WITH_NULL_NULL which is the
* specified ciphersuite for the handshake (pre-change cipher spec). */
session_ptr -> nx_secure_tls_session_ciphersuite = NX_NULL;
/* Initialize key material structure. */
_nx_secure_tls_key_material_init(&session_ptr -> nx_secure_tls_key_material);
/* Session ID length. Initialize to 0 - will be assigned during handshake. */
session_ptr -> nx_secure_tls_session_id_length = 0;
/* Clear out Session ID used for session re-negotiation. */
NX_SECURE_MEMSET(session_ptr -> nx_secure_tls_session_id, 0, NX_SECURE_TLS_SESSION_ID_SIZE);
/* Clear out sequence numbers for the current TLS session. */
NX_SECURE_MEMSET(session_ptr -> nx_secure_tls_local_sequence_number, 0, sizeof(session_ptr -> nx_secure_tls_local_sequence_number));
NX_SECURE_MEMSET(session_ptr -> nx_secure_tls_remote_sequence_number, 0, sizeof(session_ptr -> nx_secure_tls_remote_sequence_number));
/* Clear out all remote certificates. */
status = _nx_secure_tls_remote_certificate_free_all(session_ptr);
/* Clear out the active certificate so if the session is reused it will return to the default (local cert). */
session_ptr -> nx_secure_tls_credentials.nx_secure_tls_active_certificate = NX_NULL;
#ifndef NX_SECURE_TLS_DISABLE_SECURE_RENEGOTIATION
session_ptr -> nx_secure_tls_secure_renegotiation = NX_FALSE;
NX_SECURE_MEMSET(session_ptr -> nx_secure_tls_remote_verify_data, 0, NX_SECURE_TLS_FINISHED_HASH_SIZE);
NX_SECURE_MEMSET(session_ptr -> nx_secure_tls_local_verify_data, 0, NX_SECURE_TLS_FINISHED_HASH_SIZE);
/* Flag to indicate when a session renegotiation is taking place. */
session_ptr -> nx_secure_tls_renegotiation_handshake = NX_FALSE;
session_ptr -> nx_secure_tls_secure_renegotiation_verified = NX_FALSE;
session_ptr -> nx_secure_tls_server_renegotiation_requested = NX_FALSE;
#endif
/* Flag to indicate when credentials have been received from the remote host. */
session_ptr -> nx_secure_tls_received_remote_credentials = NX_FALSE;
#ifndef NX_SECURE_TLS_SERVER_DISABLED
/* The state of the server handshake if this is a server socket. */
session_ptr -> nx_secure_tls_server_state = NX_SECURE_TLS_SERVER_STATE_IDLE;
#endif
#ifndef NX_SECURE_TLS_CLIENT_DISABLED
/* The state of the client handshake if this is a client socket. */
session_ptr -> nx_secure_tls_client_state = NX_SECURE_TLS_CLIENT_STATE_IDLE;
#endif
/* Indicate no messages to be hashed. */
session_ptr -> nx_secure_tls_key_material.nx_secure_tls_handshake_cache_length = 0;
#if (NX_SECURE_TLS_TLS_1_3_ENABLED)
/* Reset TLS 1.3 state. */
session_ptr -> nx_secure_tls_1_3 = session_ptr -> nx_secure_tls_1_3_supported;
#endif
/* Release the protection. */
tx_mutex_put(&_nx_secure_tls_protection);
return(status);
}
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