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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_psk_find PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function finds a pre-shared key (PSK) in a TLS session for use */
/* with a TLS 1.3 PSK extension. The PSK is found using an "identity" */
/* that should match a field in the PSK structure in the TLS session. */
/* */
/* INPUT */
/* */
/* tls_session Pointer to TLS Session */
/* psk_data Pointer to PSK data */
/* psk_length Length of PSK data */
/* psk_identity PSK identity data */
/* identity_length Length of identity data */
/* psk_store_index Index of found PSK in store */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* tx_mutex_get Get protection mutex */
/* tx_mutex_put Put protection mutex */
/* */
/* CALLED BY */
/* */
/* _nx_secure_tls_process_clienthello_psk_extension */
/* Process an incoming TLS 1.3 */
/* PSK extension */
/* */
/**************************************************************************/
#if (NX_SECURE_TLS_TLS_1_3_ENABLED) && defined(NX_SECURE_ENABLE_PSK_CIPHERSUITES)
UINT _nx_secure_tls_psk_identity_find(NX_SECURE_TLS_SESSION *tls_session, UCHAR **psk_data, UINT *psk_length,
UCHAR *psk_identity, UINT identity_length, UINT *psk_store_index)
{
UINT psk_list_size;
UINT compare_val;
UINT i;
/* Get the protection. */
tx_mutex_get(&_nx_secure_tls_protection, TX_WAIT_FOREVER);
psk_list_size = tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_count;
/* Loop through all PSKs, looking for a matching identity string. */
for (i = 0; i < psk_list_size; ++i)
{
/* GHSA-8h38-qjhh-mf2h */
/* PSK length must be equal */
if (identity_length != tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_store[i].nx_secure_tls_psk_id_size) {
continue;
}
/* compare the PSK using stored psk length */
compare_val = (UINT)NX_SECURE_MEMCMP(tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_store[i].nx_secure_tls_psk_id, psk_identity,
tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_store[i].nx_secure_tls_psk_id_size);
/* See if the identity matched */
if (compare_val == 0)
{
/* Found a matching identity, return the associated PSK. */
*psk_data = tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_store[i].nx_secure_tls_psk_data;
*psk_length = tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_store[i].nx_secure_tls_psk_data_size;
if(psk_store_index != NX_NULL)
{
*psk_store_index = i;
}
/* Release the protection. */
tx_mutex_put(&_nx_secure_tls_protection);
return(NX_SUCCESS);
}
}
/* Release the protection. */
tx_mutex_put(&_nx_secure_tls_protection);
return(NX_SECURE_TLS_NO_MATCHING_PSK);
}
#endif
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