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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"
#ifdef NX_SECURE_ENABLE_DTLS
#include "nx_secure_dtls.h"
#endif /* NX_SECURE_ENABLE_DTLS */
#if defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE) && !defined(NX_SECURE_TLS_CLIENT_DISABLED)
static UCHAR hash[64]; /* We concatenate MD5 and SHA-1 hashes into this buffer, OR SHA-256, SHA-384, SHA512. */
static UCHAR decrypted_signature[512];
#endif /* defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE) && !defined(NX_SECURE_TLS_CLIENT_DISABLED) */
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_tls_process_server_key_exchange PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes an incoming ServerKeyExchange message, */
/* which is sent by the remote TLS Server host when certain */
/* ciphersuites (e.g. those using Diffie-Hellman) are used. */
/* */
/* INPUT */
/* */
/* tls_session TLS control block */
/* packet_buffer Pointer to message data */
/* message_length Length of message data (bytes)*/
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_secure_tls_find_curve_method Find named curve used */
/* _nx_secure_x509_remote_endpoint_certificate_get */
/* Get remote host certificate */
/* _nx_secure_x509_find_certificate_methods */
/* Find certificate methods */
/* _nx_secure_x509_pkcs7_decode Decode the PKCS#7 signature */
/* [nx_crypto_init] Crypto initialization */
/* [nx_crypto_operation] Crypto operation */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_client_handshake DTLS client state machine */
/* _nx_secure_tls_client_handshake TLS client state machine */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), update */
/* ECC find curve method, */
/* verified memcpy use cases, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _nx_secure_tls_process_server_key_exchange(NX_SECURE_TLS_SESSION *tls_session,
UCHAR *packet_buffer, UINT message_length)
{
#if !defined(NX_SECURE_TLS_CLIENT_DISABLED)
#ifdef NX_SECURE_ENABLE_PSK_CIPHERSUITES
USHORT length;
#endif /* NX_SECURE_ENABLE_PSK_CIPHERSUITES */
#if defined(NX_SECURE_ENABLE_PSK_CIPHERSUITES) || defined(NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE) || \
(defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE))
UINT status;
const NX_SECURE_TLS_CIPHERSUITE_INFO *ciphersuite;
#endif /* defined(NX_SECURE_ENABLE_PSK_CIPHERSUITES) || defined(NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE) */
#if defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE)
const NX_CRYPTO_METHOD *curve_method;
const NX_CRYPTO_METHOD *curve_method_cert;
const NX_CRYPTO_METHOD *ecdhe_method;
const NX_CRYPTO_METHOD *hash_method;
const NX_CRYPTO_METHOD *auth_method;
VOID *handler = NX_NULL;
UCHAR pubkey_length;
UCHAR *pubkey;
USHORT signature_length;
NX_SECURE_X509_CERT *server_certificate;
NX_SECURE_X509_CRYPTO *crypto_methods;
UINT sig_oid_length;
const UCHAR *sig_oid;
UINT decrypted_hash_length;
const UCHAR *decrypted_hash;
UINT compare_result;
NX_SECURE_EC_PUBLIC_KEY *ec_pubkey;
NX_CRYPTO_EXTENDED_OUTPUT extended_output;
UCHAR *current_buffer;
UCHAR hash_algorithm;
UCHAR signature_algorithm;
USHORT signature_algorithm_id;
#if (NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED)
UINT i;
#endif /* NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED */
#endif /* defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE) */
NX_PARAMETER_NOT_USED(tls_session);
NX_PARAMETER_NOT_USED(packet_buffer);
NX_PARAMETER_NOT_USED(message_length);
#if defined(NX_SECURE_ENABLE_PSK_CIPHERSUITES) || defined(NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE) || \
(defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE))
/* Figure out which ciphersuite we are using. */
ciphersuite = tls_session -> nx_secure_tls_session_ciphersuite;
if (ciphersuite == NX_NULL)
{
/* Likely internal error since at this point ciphersuite negotiation was theoretically completed. */
return(NX_SECURE_TLS_UNKNOWN_CIPHERSUITE);
}
#endif /* defined(NX_SECURE_ENABLE_PSK_CIPHERSUITES) || defined(NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE) */
#ifdef NX_SECURE_ENABLE_PSK_CIPHERSUITES
/* Check for PSK ciphersuites. */
if (ciphersuite -> nx_secure_tls_public_auth -> nx_crypto_algorithm == NX_CRYPTO_KEY_EXCHANGE_PSK)
{
/* Get identity hint length. */
length = (USHORT)((packet_buffer[0] << 8) + (USHORT)packet_buffer[1]);
packet_buffer += 2;
if (length > message_length || length > NX_SECURE_TLS_MAX_PSK_ID_SIZE)
{
/* The payload is larger than the header indicated. */
return(NX_SECURE_TLS_INCORRECT_MESSAGE_LENGTH);
}
/* Extract the identity hint and save in the TLS Session. Then when pre-master is generated
in client_handshake, we can do the right thing... */
NX_SECURE_MEMCPY(tls_session -> nx_secure_tls_credentials.nx_secure_tls_remote_psk_id, &packet_buffer[0], length); /* Use case of memcpy is verified. */
tls_session -> nx_secure_tls_credentials.nx_secure_tls_remote_psk_id_size = length;
return(NX_SECURE_TLS_SUCCESS);
}
#endif
#ifdef NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE
/* Check for ECJ-PAKE ciphersuites. */
if (ciphersuite -> nx_secure_tls_public_auth -> nx_crypto_algorithm == NX_CRYPTO_KEY_EXCHANGE_ECJPAKE)
{
/* Make sure curve type is named_curve (3). */
if (packet_buffer[0] != 3)
{
return(NX_SECURE_TLS_UNSUPPORTED_ECC_FORMAT);
}
/* Only secp256r1 (23) is supported. */
if (packet_buffer[1] != 0 || packet_buffer[2] != 23)
{
return(NX_SECURE_TLS_UNSUPPORTED_ECC_CURVE);
}
packet_buffer += 3;
tls_session -> nx_secure_tls_key_material.nx_secure_tls_pre_master_secret_size = 32;
status = ciphersuite -> nx_secure_tls_public_auth -> nx_crypto_operation(NX_CRYPTO_ECJPAKE_SERVER_KEY_EXCHANGE_PROCESS,
tls_session -> nx_secure_public_auth_handler,
(NX_CRYPTO_METHOD*)ciphersuite -> nx_secure_tls_public_auth,
NX_NULL, 0,
packet_buffer,
message_length,
NX_NULL,
tls_session -> nx_secure_tls_key_material.nx_secure_tls_pre_master_secret,
tls_session -> nx_secure_tls_key_material.nx_secure_tls_pre_master_secret_size,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size,
NX_NULL, NX_NULL);
if (status)
{
return(status);
}
if (ciphersuite -> nx_secure_tls_public_auth -> nx_crypto_cleanup)
{
status = ciphersuite -> nx_secure_tls_public_auth -> nx_crypto_cleanup(tls_session -> nx_secure_public_auth_metadata_area);
}
return(status);
}
#endif
#if defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE)
if (ciphersuite -> nx_secure_tls_public_cipher -> nx_crypto_algorithm == NX_CRYPTO_KEY_EXCHANGE_ECDHE)
{
if (tls_session -> nx_secure_tls_client_state != NX_SECURE_TLS_CLIENT_STATE_SERVER_CERTIFICATE)
{
return(NX_SECURE_TLS_UNEXPECTED_MESSAGE);
}
tls_session -> nx_secure_tls_client_state = NX_SECURE_TLS_CLIENT_STATE_SERVER_KEY_EXCHANGE;
/* Make sure curve type is named_curve (3). */
if (packet_buffer[0] != 3)
{
return(NX_SECURE_TLS_UNSUPPORTED_ECC_FORMAT);
}
/* Find out which named curve the server is using. */
status = _nx_secure_tls_find_curve_method(tls_session, (USHORT)((packet_buffer[1] << 8) + packet_buffer[2]), &curve_method, NX_NULL);
if(status != NX_SUCCESS)
{
return(status);
}
if (curve_method == NX_NULL)
{
/* The remote server is using an unsupported curve. */
return(NX_SECURE_TLS_UNSUPPORTED_ECC_CURVE);
}
current_buffer = &packet_buffer[3];
/* Get reference to remote server certificate so we can get the public key for signature verification. */
status = _nx_secure_x509_remote_endpoint_certificate_get(&tls_session -> nx_secure_tls_credentials.nx_secure_tls_certificate_store,
&server_certificate);
if (status || server_certificate == NX_NULL)
{
/* No certificate found, error! */
return(NX_SECURE_TLS_CERTIFICATE_NOT_FOUND);
}
pubkey_length = current_buffer[0];
pubkey = ¤t_buffer[1];
current_buffer += pubkey_length + 1;
#if (NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED)
#ifdef NX_SECURE_ENABLE_DTLS
if (tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_0 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_1 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_DTLS_VERSION_1_0)
#else
if (tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_0 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_1)
#endif /* NX_SECURE_ENABLE_DTLS */
{
hash_algorithm = NX_SECURE_TLS_HASH_ALGORITHM_SHA1;
if (server_certificate -> nx_secure_x509_public_algorithm == NX_SECURE_TLS_X509_TYPE_EC)
{
signature_algorithm = NX_SECURE_TLS_SIGNATURE_ALGORITHM_ECDSA;
}
else
{
signature_algorithm = NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA;
}
}
else
#endif /* NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED */
{
hash_algorithm = current_buffer[0];
signature_algorithm = current_buffer[1];
current_buffer += 2;
}
/* Find out the hash algorithm used for the signature. */
/* Map signature algorithm to internal ID. */
_nx_secure_tls_get_signature_algorithm_id(((UINT)(hash_algorithm << 8) + signature_algorithm),
&signature_algorithm_id);
/* Get the cypto method. */
status = _nx_secure_x509_find_certificate_methods(server_certificate,
signature_algorithm_id,
&crypto_methods);
if (status)
{
return(NX_SECURE_TLS_UNSUPPORTED_SIGNATURE_ALGORITHM);
}
#if (NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED)
#ifdef NX_SECURE_ENABLE_DTLS
if (signature_algorithm == NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA &&
(tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_0 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_1 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_DTLS_VERSION_1_0))
#else
if (signature_algorithm == NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA &&
(tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_0 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_1))
#endif /* NX_SECURE_ENABLE_DTLS */
{
/* TLS 1.0 and TLS 1.1 use MD5 + SHA1 hash for RSA signatures. */
hash_method = tls_session -> nx_secure_tls_crypto_table -> nx_secure_tls_handshake_hash_md5_method;
}
else
#endif /* NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED */
{
hash_method = crypto_methods -> nx_secure_x509_hash_method;
}
/* Calculate the hash: SHA(ClientHello.random + ServerHello.random +
ServerKeyExchange.params); */
if (hash_method -> nx_crypto_init)
{
status = hash_method -> nx_crypto_init((NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
&handler,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
if (hash_method -> nx_crypto_operation != NX_NULL)
{
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_INITIALIZE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
NX_NULL,
0,
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
else
{
return(NX_SECURE_TLS_MISSING_CRYPTO_ROUTINE);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_UPDATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
tls_session -> nx_secure_tls_key_material.nx_secure_tls_client_random,
32,
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_UPDATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
tls_session -> nx_secure_tls_key_material.nx_secure_tls_server_random,
32,
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_UPDATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
packet_buffer,
(ULONG)(4 + pubkey_length),
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_CALCULATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
NX_NULL,
0,
NX_NULL,
hash,
hash_method -> nx_crypto_ICV_size_in_bits >> 3,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
if (hash_method -> nx_crypto_cleanup)
{
status = hash_method -> nx_crypto_cleanup(tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
handler = NX_NULL;
#if (NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED)
#ifdef NX_SECURE_ENABLE_DTLS
if (signature_algorithm == NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA &&
(tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_0 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_1 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_DTLS_VERSION_1_0))
#else
if (signature_algorithm == NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA &&
(tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_0 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_1))
#endif /* NX_SECURE_ENABLE_DTLS */
{
hash_method = tls_session -> nx_secure_tls_crypto_table -> nx_secure_tls_handshake_hash_sha1_method;;
/* Calculate the hash: SHA(ClientHello.random + ServerHello.random +
ServerKeyExchange.params); */
if (hash_method -> nx_crypto_init)
{
status = hash_method -> nx_crypto_init((NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
&handler,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
if (hash_method -> nx_crypto_operation != NX_NULL)
{
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_INITIALIZE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
NX_NULL,
0,
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
else
{
return(NX_SECURE_TLS_MISSING_CRYPTO_ROUTINE);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_UPDATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
tls_session -> nx_secure_tls_key_material.nx_secure_tls_client_random,
32,
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_UPDATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
tls_session -> nx_secure_tls_key_material.nx_secure_tls_server_random,
32,
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_UPDATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
packet_buffer,
(ULONG)(4 + pubkey_length),
NX_NULL,
NX_NULL,
0,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_CALCULATE,
handler,
(NX_CRYPTO_METHOD*)hash_method,
NX_NULL,
0,
NX_NULL,
0,
NX_NULL,
&hash[16],
hash_method -> nx_crypto_ICV_size_in_bits >> 3,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch,
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size,
NX_NULL,
NX_NULL);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
if (hash_method -> nx_crypto_cleanup)
{
status = hash_method -> nx_crypto_cleanup(tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
handler = NX_NULL;
}
#endif /* NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED */
signature_length = (USHORT)((current_buffer[0] << 8) + current_buffer[1]);
current_buffer += 2;
/* Verify the signature. */
auth_method = ciphersuite -> nx_secure_tls_public_auth;
if (signature_algorithm == NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA &&
(auth_method -> nx_crypto_algorithm == NX_CRYPTO_DIGITAL_SIGNATURE_RSA ||
auth_method -> nx_crypto_algorithm == NX_CRYPTO_KEY_EXCHANGE_RSA))
{
/* Verify the RSA signature. */
if (auth_method -> nx_crypto_init != NX_NULL)
{
/* Initialize the crypto method with public key. */
status = auth_method -> nx_crypto_init((NX_CRYPTO_METHOD*)auth_method,
(UCHAR *)server_certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_modulus,
(NX_CRYPTO_KEY_SIZE)(server_certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_modulus_length << 3),
&handler,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
if (auth_method -> nx_crypto_algorithm == NX_CRYPTO_KEY_EXCHANGE_RSA)
{
status = auth_method -> nx_crypto_operation(NX_CRYPTO_DECRYPT,
handler,
(NX_CRYPTO_METHOD*)auth_method,
(UCHAR *)server_certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_exponent,
(NX_CRYPTO_KEY_SIZE)(server_certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_exponent_length << 3),
current_buffer,
signature_length,
NX_NULL,
decrypted_signature,
sizeof(decrypted_signature),
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size,
NX_NULL, NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
if (auth_method -> nx_crypto_cleanup)
{
status = auth_method -> nx_crypto_cleanup(tls_session -> nx_secure_public_auth_metadata_area);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
handler = NX_NULL;
#if (NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED)
#ifdef NX_SECURE_ENABLE_DTLS
if (tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_0 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_1 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_DTLS_VERSION_1_0)
#else
if (tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_0 ||
tls_session -> nx_secure_tls_protocol_version == NX_SECURE_TLS_VERSION_TLS_1_1)
#endif /* NX_SECURE_ENABLE_DTLS */
{
if (signature_length < 39)
{
return(NX_SECURE_TLS_SIGNATURE_VERIFICATION_ERROR);
}
/* Block type is 0x00, 0x01 for signatures */
if (decrypted_signature[0] != 0x0 && decrypted_signature[1] != 0x1)
{
/* Unknown block type. */
return(NX_SECURE_TLS_PADDING_CHECK_FAILED);
}
/* Check padding. */
for (i = 2; i < (UINT)(signature_length - 37); ++i)
{
if (decrypted_signature[i] != (UCHAR)0xFF)
{
/* Bad padding value. */
return(NX_SECURE_TLS_PADDING_CHECK_FAILED);
}
}
/* Make sure we actually saw a NULL byte. */
if (decrypted_signature[i] != 0x00)
{
return(NX_SECURE_TLS_PADDING_CHECK_FAILED);
}
decrypted_hash = &decrypted_signature[i + 1];
decrypted_hash_length = 36;
}
else
#endif /* NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED */
{
/* Decode the decrypted signature. */
status = _nx_secure_x509_pkcs7_decode(decrypted_signature, signature_length, &sig_oid, &sig_oid_length,
&decrypted_hash, &decrypted_hash_length);
if (status != NX_SUCCESS)
{
return(NX_SECURE_TLS_SIGNATURE_VERIFICATION_ERROR);
}
if (decrypted_hash_length != (hash_method -> nx_crypto_ICV_size_in_bits >> 3))
{
return(NX_SECURE_TLS_SIGNATURE_VERIFICATION_ERROR);
}
}
/* Compare generated hash with decrypted hash. */
compare_result = (UINT)NX_SECURE_MEMCMP(hash, decrypted_hash, decrypted_hash_length);
#ifdef NX_SECURE_KEY_CLEAR
NX_SECURE_MEMSET(hash, 0, sizeof(hash));
NX_SECURE_MEMSET(decrypted_signature, 0, sizeof(decrypted_signature));
#endif /* NX_SECURE_KEY_CLEAR */
if (compare_result != 0)
{
return(NX_SECURE_TLS_SIGNATURE_VERIFICATION_ERROR);
}
}
else if (signature_algorithm == NX_SECURE_TLS_SIGNATURE_ALGORITHM_ECDSA &&
auth_method -> nx_crypto_algorithm == NX_CRYPTO_DIGITAL_SIGNATURE_ECDSA)
{
/* Verify the ECDSA signature. */
ec_pubkey = &server_certificate -> nx_secure_x509_public_key.ec_public_key;
/* Find out which named curve the remote certificate is using. */
status = _nx_secure_tls_find_curve_method(tls_session, (USHORT)(ec_pubkey -> nx_secure_ec_named_curve), &curve_method_cert, NX_NULL);
if(status != NX_SUCCESS)
{
return(status);
}
if (curve_method_cert == NX_NULL)
{
/* The remote certificate is using an unsupported curve. */
return(NX_SECURE_TLS_UNSUPPORTED_ECC_CURVE);
}
if (auth_method -> nx_crypto_init != NX_NULL)
{
status = auth_method -> nx_crypto_init((NX_CRYPTO_METHOD*)auth_method,
(UCHAR *)ec_pubkey -> nx_secure_ec_public_key,
(NX_CRYPTO_KEY_SIZE)(ec_pubkey -> nx_secure_ec_public_key_length << 3),
&handler,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
if (auth_method -> nx_crypto_operation == NX_NULL)
{
return(NX_SECURE_TLS_MISSING_CRYPTO_ROUTINE);
}
status = auth_method -> nx_crypto_operation(NX_CRYPTO_EC_CURVE_SET, handler,
(NX_CRYPTO_METHOD*)auth_method, NX_NULL, 0,
(UCHAR *)curve_method_cert, sizeof(NX_CRYPTO_METHOD *), NX_NULL,
NX_NULL, 0,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size,
NX_NULL, NX_NULL);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
if (packet_buffer + message_length < current_buffer + signature_length)
{
return(NX_SECURE_TLS_SIGNATURE_VERIFICATION_ERROR);
}
status = auth_method -> nx_crypto_operation(NX_CRYPTO_VERIFY, handler,
(NX_CRYPTO_METHOD*)auth_method,
(UCHAR *)ec_pubkey -> nx_secure_ec_public_key,
(NX_CRYPTO_KEY_SIZE)(ec_pubkey -> nx_secure_ec_public_key_length << 3),
hash,
hash_method -> nx_crypto_ICV_size_in_bits >> 3,
NX_NULL,
current_buffer,
signature_length,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size,
NX_NULL, NX_NULL);
if (status == NX_CRYPTO_AUTHENTICATION_FAILED)
{
return(NX_SECURE_TLS_SIGNATURE_VERIFICATION_ERROR);
}
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
if (auth_method -> nx_crypto_cleanup)
{
status = auth_method -> nx_crypto_cleanup(tls_session -> nx_secure_public_auth_metadata_area);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
}
else
{
/* The signature hash algorithm used by the server is not supported. */
return(NX_SECURE_TLS_UNSUPPORTED_SIGNATURE_ALGORITHM);
}
ecdhe_method = ciphersuite -> nx_secure_tls_public_cipher;
if (ecdhe_method -> nx_crypto_operation == NX_NULL)
{
return(NX_SECURE_TLS_MISSING_CRYPTO_ROUTINE);
}
if (ecdhe_method -> nx_crypto_init != NX_NULL)
{
status = ecdhe_method -> nx_crypto_init((NX_CRYPTO_METHOD*)ecdhe_method,
NX_NULL,
0,
&handler,
tls_session -> nx_secure_public_cipher_metadata_area,
tls_session -> nx_secure_public_cipher_metadata_size);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
status = ecdhe_method -> nx_crypto_operation(NX_CRYPTO_EC_CURVE_SET, handler,
(NX_CRYPTO_METHOD*)ecdhe_method, NX_NULL, 0,
(UCHAR *)curve_method, sizeof(NX_CRYPTO_METHOD *), NX_NULL,
NX_NULL, 0,
tls_session -> nx_secure_public_cipher_metadata_area,
tls_session -> nx_secure_public_cipher_metadata_size,
NX_NULL, NX_NULL);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
/* Store public key in the nx_secure_tls_new_key_material_data. */
extended_output.nx_crypto_extended_output_data = &tls_session -> nx_secure_tls_key_material.nx_secure_tls_new_key_material_data[1];
extended_output.nx_crypto_extended_output_length_in_byte = sizeof(tls_session -> nx_secure_tls_key_material.nx_secure_tls_new_key_material_data) - 1;
extended_output.nx_crypto_extended_output_actual_size = 0;
status = ecdhe_method -> nx_crypto_operation(NX_CRYPTO_DH_SETUP, handler,
(NX_CRYPTO_METHOD*)ecdhe_method, NX_NULL, 0,
NX_NULL, 0, NX_NULL,
(UCHAR *)&extended_output,
sizeof(extended_output),
tls_session -> nx_secure_public_cipher_metadata_area,
tls_session -> nx_secure_public_cipher_metadata_size,
NX_NULL, NX_NULL);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
/* Store the length in the first octet. */
tls_session -> nx_secure_tls_key_material.nx_secure_tls_new_key_material_data[0] = (UCHAR)extended_output.nx_crypto_extended_output_actual_size;
extended_output.nx_crypto_extended_output_data = tls_session -> nx_secure_tls_key_material.nx_secure_tls_pre_master_secret;
extended_output.nx_crypto_extended_output_length_in_byte = sizeof(tls_session -> nx_secure_tls_key_material.nx_secure_tls_pre_master_secret);
extended_output.nx_crypto_extended_output_actual_size = 0;
status = ecdhe_method -> nx_crypto_operation(NX_CRYPTO_DH_CALCULATE, handler,
(NX_CRYPTO_METHOD*)ecdhe_method, NX_NULL, 0,
pubkey, pubkey_length, NX_NULL,
(UCHAR *)&extended_output,
sizeof(extended_output),
tls_session -> nx_secure_public_cipher_metadata_area,
tls_session -> nx_secure_public_cipher_metadata_size,
NX_NULL, NX_NULL);
if (status != NX_CRYPTO_SUCCESS)
{
return(status);
}
tls_session -> nx_secure_tls_key_material.nx_secure_tls_pre_master_secret_size = extended_output.nx_crypto_extended_output_actual_size;
if (ecdhe_method -> nx_crypto_cleanup)
{
status = ecdhe_method -> nx_crypto_cleanup(tls_session -> nx_secure_public_cipher_metadata_area);
}
return(status);
}
#endif /* defined(NX_SECURE_ENABLE_ECC_CIPHERSUITE) */
/* No server key exchange should be received by the current cipher suite. */
return(NX_SECURE_TLS_UNEXPECTED_MESSAGE);
#else /* !define(NX_SECURE_TLS_CLIENT_DISABLED) */
/* If Client TLS is disabled and we recieve a server key exchange, error! */
NX_PARAMETER_NOT_USED(tls_session);
NX_PARAMETER_NOT_USED(packet_buffer);
NX_PARAMETER_NOT_USED(message_length);
return(NX_SECURE_TLS_UNEXPECTED_MESSAGE);
#endif
}
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