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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"
#include "nx_secure_x509.h"
#ifdef NX_SECURE_ENABLE_DTLS
#include "nx_secure_dtls.h"
#endif /* NX_SECURE_ENABLE_DTLS */
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_tls_send_certificate_request PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function populates an NX_PACKET with a CertificateRequest */
/* message which is used to indicate to the remote client that we wish */
/* to do a Client certificate verification. The Client should respond */
/* with an appropriate certificate and CertificateVerify message. */
/* */
/* INPUT */
/* */
/* tls_session TLS control block */
/* send_packet Packet to be filled */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_secure_tls_server_handshake TLS server state machine */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _nx_secure_tls_send_certificate_request(NX_SECURE_TLS_SESSION *tls_session,
NX_PACKET *send_packet)
{
UINT length;
UCHAR *packet_buffer;
#if (NX_SECURE_TLS_TLS_1_3_ENABLED)
UINT ext_len_pos = 0;
UINT sighash_len = 0;
UINT i;
UINT sign_alg;
#endif
/* Structure:
* | 1 | <Cert types count> | 2 | <Sig algs length> |
* | Cert types count | Cert types (1 byte each) | Sig Hash algorithms length | Algorithms (2 bytes each) |
*/
if (((ULONG)(send_packet -> nx_packet_data_end) - (ULONG)(send_packet -> nx_packet_append_ptr)) < 11u)
{
/* Packet buffer is too small. */
return(NX_SECURE_TLS_PACKET_BUFFER_TOO_SMALL);
}
packet_buffer = send_packet -> nx_packet_append_ptr;
/* Use our length as an index into the buffer. */
length = 0;
#if (NX_SECURE_TLS_TLS_1_3_ENABLED)
if (tls_session -> nx_secure_tls_1_3)
{
/* Put context here. */
packet_buffer[length] = 0;
length++;
/* Skip the extensions length. */
ext_len_pos = length;
length += 2;
/* Add signature_algorithms extension. */
packet_buffer[length] = (UCHAR)(NX_SECURE_TLS_EXTENSION_SIGNATURE_ALGORITHMS >> 8);
packet_buffer[length + 1] = (UCHAR)(NX_SECURE_TLS_EXTENSION_SIGNATURE_ALGORITHMS);
length += 2;
/* Skip signature_algorithm length. */
length += 2;
}
else
#endif
{
#ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE
if (tls_session -> nx_secure_tls_ecc.nx_secure_tls_ecc_supported_groups_count != 0)
{
/* If ECC is initialized, we support RSA and ECDSA signatures. */
packet_buffer[length] = 0x2;
length += 1;
packet_buffer[length] = NX_SECURE_TLS_CERT_TYPE_RSA_SIGN;
length += 1;
packet_buffer[length] = NX_SECURE_TLS_CERT_TYPE_ECDSA_SIGN;
length += 1;
}
else
#endif /* NX_SECURE_ENABLE_ECC_CIPHERSUITE */
{
/* ECC is not initialized, we only support RSA signatures for now... */
packet_buffer[length] = 0x1;
length += 1;
packet_buffer[length] = NX_SECURE_TLS_CERT_TYPE_RSA_SIGN;
length += 1;
}
}
#if (NX_SECURE_TLS_TLS_1_2_ENABLED)
/* TLS 1.2 CertificateRequest contains a list of signature algorithms that
is not included in earlier TLS versions. */
#ifdef NX_SECURE_ENABLE_DTLS
if (tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_2 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_DTLS_VERSION_1_2)
#else
if (tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_2)
#endif /* NX_SECURE_ENABLE_DTLS */
{
#ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE
if (tls_session -> nx_secure_tls_ecc.nx_secure_tls_ecc_supported_groups_count != 0)
{
#if (NX_SECURE_TLS_TLS_1_3_ENABLED)
if (tls_session -> nx_secure_tls_1_3)
{
/* Skip length field. */
length = length + 2;
/* Add supported signature algorithms. */
for (i = 0; i < tls_session -> nx_secure_tls_ecc.nx_secure_tls_ecc_supported_groups_count; i++)
{
switch (tls_session -> nx_secure_tls_ecc.nx_secure_tls_ecc_supported_groups[i])
{
case (NX_CRYPTO_EC_SECP256R1 & 0x00FF):
sign_alg = NX_SECURE_TLS_SIGNATURE_ECDSA_SHA256;
break;
case (NX_CRYPTO_EC_SECP384R1 & 0x00FF):
sign_alg = NX_SECURE_TLS_SIGNATURE_ECDSA_SHA384;
break;
case (NX_CRYPTO_EC_SECP521R1 & 0x00FF):
sign_alg = NX_SECURE_TLS_SIGNATURE_ECDSA_SHA512;
break;
default:
continue;
}
if (((ULONG)(send_packet -> nx_packet_data_end) - (ULONG)(send_packet -> nx_packet_append_ptr)) < (length + 2u))
{
/* Packet buffer is too small. */
return(NX_SECURE_TLS_PACKET_BUFFER_TOO_SMALL);
}
packet_buffer[length] = (UCHAR)(sign_alg >> 8);
packet_buffer[length + 1] = (UCHAR)(sign_alg);
length = length + 2;
sighash_len = sighash_len + 2;
}
}
else
#endif
{
/* ECC is initialized. */
/* Length of supported signature algorithms - each entry is 2 bytes so length
is number of entries * 2. */
packet_buffer[length] = (UCHAR)0x0;
packet_buffer[length + 1] = (UCHAR)0x4;
length = length + 2;
/* Extract the signature algorithms. */
packet_buffer[length] = (UCHAR)(NX_SECURE_TLS_SIGNATURE_RSA_SHA256 >> 8);
packet_buffer[length + 1] = (UCHAR)(NX_SECURE_TLS_SIGNATURE_RSA_SHA256);
length = length + 2;
packet_buffer[length] = (UCHAR)(NX_SECURE_TLS_SIGNATURE_ECDSA_SHA256 >> 8);
packet_buffer[length + 1] = (UCHAR)(NX_SECURE_TLS_SIGNATURE_ECDSA_SHA256);
length = length + 2;
}
}
else
#endif /* NX_SECURE_ENABLE_ECC_CIPHERSUITE */
{
/* Length of supported signature algorithms - each entry is 2 bytes so length
is number of entries * 2. */
/* Note: We only support 1 one signature algorithm for now... */
packet_buffer[length] = (UCHAR)0x0;
packet_buffer[length + 1] = (UCHAR)0x2;
length = length + 2;
/* Extract the signature algorithms. */
packet_buffer[length] = (UCHAR)(NX_SECURE_TLS_SIGNATURE_RSA_SHA256 >> 8);
packet_buffer[length + 1] = (UCHAR)(NX_SECURE_TLS_SIGNATURE_RSA_SHA256);
length = length + 2;
}
}
#endif
#if (NX_SECURE_TLS_TLS_1_3_ENABLED)
if (tls_session -> nx_secure_tls_1_3)
{
/* Set extensions length and signature algorithm length. */
packet_buffer[ext_len_pos] = (UCHAR)((sighash_len + 6) >> 8);
packet_buffer[ext_len_pos + 1] = (UCHAR)(sighash_len + 6);
packet_buffer[ext_len_pos + 4] = (UCHAR)((sighash_len + 2) >> 8);
packet_buffer[ext_len_pos + 5] = (UCHAR)(sighash_len + 2);
packet_buffer[ext_len_pos + 6] = (UCHAR)(sighash_len >> 8);
packet_buffer[ext_len_pos + 7] = (UCHAR)(sighash_len);
}
else
#endif
{
/* Distinguished names length - right now we do not support this. */
packet_buffer[length] = (UCHAR)0x0;
packet_buffer[length + 1] = (UCHAR)0x0;
length = length + 2;
}
/* The remainder of the message is the Certificate Authorities list. It can be used
to select a certificate in a particular authorization chain. */
/* Let the caller know how many bytes we wrote. */
send_packet -> nx_packet_append_ptr = send_packet -> nx_packet_append_ptr + (length);
send_packet -> nx_packet_length = send_packet -> nx_packet_length + (length);
return(NX_SUCCESS);
}
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