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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 necessary system files. */
#include "nx_secure_tls.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_tls_session_x509_client_verify_configure PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function enables Client Certificate Verification for TLS */
/* Server instances and accepts buffer space to hold incoming */
/* certificates sent by the remote host. If enabled, the TLS Server */
/* will request and verify a remote TLS Client Certificate using all */
/* available crypto signature routines. The provided buffer must have */
/* enough space allocated for the maximum size of a certificate that */
/* may be provided by a client times the expected size of the */
/* certificate chain that may be provided. The size needed can be */
/* calculated using the following formula: */
/* */
/* size = (<# of certs>) * (sizeof(NX_SECURE_X509_CERT) + */
/* <expected max cert size (~2KB)>) */
/* */
/* The space will be divided equally amongst the number of certificates*/
/* that can be carved from the provided buffer. */
/* */
/* The incoming certificate chain will be verified against the trusted */
/* certificate store built using nx_secure_tls_trusted_certificate_add.*/
/* Client X509 certificate verification in TLS Server proceeds in the */
/* same manner as the default TLS Client behavior in verifying server */
/* certificates. */
/* */
/* Note that this will only work for TLS Server sessions. Enabling */
/* Client Certificate Verification for TLS Client sessions will have */
/* no effect. */
/* */
/* As of 5.12, the certificate buffer may be set to NX_NULL to */
/* indicate that internal certificate buffering should be used. If the */
/* certificate_buffer parameter is NX_NULL, the buffer_size parameter */
/* should be set to 0. */
/* */
/* INPUT */
/* */
/* tls_session Pointer to TLS Session */
/* certs_number Number of client certs */
/* certificate_buffer Buffer allocated for certs */
/* buffer_size Buffer size in bytes */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_secure_tls_remote_certificate_buffer_allocate */
/* Allocate certificate buffers */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nx_secure_tls_session_x509_client_verify_configure(NX_SECURE_TLS_SESSION *tls_session, UINT certs_number, VOID *certificate_buffer, ULONG buffer_size)
{
#ifndef NX_SECURE_DISABLE_X509
UINT status = NX_SUCCESS;
/* Signal the TLS stack to request and verify remote Client certificates. */
tls_session -> nx_secure_tls_verify_client_certificate = NX_TRUE;
/* Allocate the certificate space. If buffer is NULL, then use internal in-place certificate buffering. */
if(certificate_buffer != NX_NULL && buffer_size != 0)
{
status = _nx_secure_tls_remote_certificate_buffer_allocate(tls_session, certs_number, certificate_buffer, buffer_size);
}
return(status);
#else
NX_PARAMETER_NOT_USED(tls_session);
NX_PARAMETER_NOT_USED(certs_number);
NX_PARAMETER_NOT_USED(certificate_buffer);
NX_PARAMETER_NOT_USED(buffer_size);
return(NX_NOT_SUPPORTED);
#endif
}
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