netxduo
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Outline
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#define NX_SECURE_SOURCE_CODE
#include "nx_secure_tls.h"
#include "nx_secure_dtls.h"
handshake_hash
_nx_secure_decrypted_signature
_NX_SECURE_OID_SHA256
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_nx_secure_tls_process_certificate_verify(NX_SECURE_TLS_SESSION *, UCHAR *, UINT)
Files
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CodeScopeSTM32 Libraries and Samplesnetxduonx_secure/src/nx_secure_tls_process_certificate_verify.c
 
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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 */ static UCHAR handshake_hash[64 + 34 + 32]; /* We concatenate MD5 and SHA-1 hashes into this buffer, OR SHA-256. */ static UCHAR _nx_secure_decrypted_signature[600]; #if (NX_SECURE_TLS_TLS_1_2_ENABLED) static const UCHAR _NX_SECURE_OID_SHA256[] = {0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20}; #endif ... /**************************************************************************/ /* */ /* FUNCTION RELEASE */ /* */ /* _nx_secure_tls_process_certificate_verify PORTABLE C */ /* 6.1.8 */ /* AUTHOR */ /* */ /* Timothy Stapko, Microsoft Corporation */ /* */ /* DESCRIPTION */ /* */ /* This function processes an incoming CertificateVerify message, */ /* which is sent by the remote client as a response to a */ /* CertificateRequest message sent by this TLS server. */ /* */ /* 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_crypto_operation] Public-key operation (eg RSA) */ /* used to verify keys */ /* [nx_crypto_init] Initialize the public-key */ /* operation */ /* _nx_secure_x509_local_device_certificate_get */ /* Get the local certificate */ /* _nx_secure_tls_find_curve_method Find named curve used */ /* _nx_secure_x509_find_certificate_methods */ /* Find signature crypto methods */ /* */ /* CALLED BY */ /* */ /* None */ /* */ /* 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 */ /* 04-02-2021 Timothy Stapko Modified comment(s), */ /* updated X.509 return value, */ /* resulting in version 6.1.6 */ /* 08-02-2021 Timothy Stapko Modified comment(s), added */ /* hash clone and cleanup, */ /* resulting in version 6.1.8 */ /* */... /**************************************************************************/ UINT _nx_secure_tls_process_certificate_verify(NX_SECURE_TLS_SESSION *tls_session, UCHAR *packet_buffer, UINT message_length) { UINT length = 0; UINT data_size = 0; USHORT signature_algorithm; UINT signature_length = 0; UINT i; INT compare_value; UCHAR *received_signature = NX_NULL; UCHAR *working_ptr; NX_SECURE_X509_CRYPTO *crypto_methods; const NX_CRYPTO_METHOD *public_cipher_method; const NX_CRYPTO_METHOD *hash_method = NX_NULL; NX_SECURE_X509_CERT *client_certificate; UINT status; VOID *handler = NX_NULL; #if (NX_SECURE_TLS_TLS_1_3_ENABLED) UINT handshake_hash_length = 0; CHAR *metadata; ULONG metadata_size; const CHAR server_context[] = "TLS 1.3, server CertificateVerify\0"; /* Includes 0-byte separator. */ const CHAR client_context[] = "TLS 1.3, client CertificateVerify\0"; /* Includes 0-byte separator. *//* ... */ #endif #ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE const NX_CRYPTO_METHOD *curve_method_cert; NX_SECURE_EC_PUBLIC_KEY *ec_pubkey;/* ... */ #endif /* NX_SECURE_ENABLE_ECC_CIPHERSUITE */ /* ==== TLS 1.0/1.1 structure (hashes are of all handshake messages to this point) ==== struct { Signature signature; } CertificateVerify; struct { select (SignatureAlgorithm) { case anonymous: struct { }; case rsa: digitally-signed struct { opaque md5_hash[16]; opaque sha_hash[20]; }; case dsa: digitally-signed struct { opaque sha_hash[20]; }; }; }; } Signature; ==== TLS 1.2 structure (signature is generally PKCS#1 encoded) ==== struct { digitally-signed struct { opaque handshake_messages[handshake_messages_length]; } } CertificateVerify; struct { SignatureAndHashAlgorithm algorithm; opaque signature<0..2^16-1>; } DigitallySigned *//* ... */ /* Get reference to remote device 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, &client_certificate); if (status || client_certificate == NX_NULL) { /* No certificate found, error! */ return(NX_SECURE_TLS_CERTIFICATE_NOT_FOUND); }if (status || client_certificate == NX_NULL) { ... } #if (NX_SECURE_TLS_TLS_1_3_ENABLED) if (tls_session -> nx_secure_tls_1_3) { /* TLS1.3 uses RSASSA-PSS instead of RSASSA-PKCS. RSASSA-PSS is not supported now. */ switch ((UINT)((packet_buffer[0] << 8) + packet_buffer[1])) { case NX_SECURE_TLS_SIGNATURE_ECDSA_SHA256: signature_algorithm = NX_SECURE_TLS_X509_TYPE_ECDSA_SHA_256; break;case NX_SECURE_TLS_SIGNATURE_ECDSA_SHA256: case NX_SECURE_TLS_SIGNATURE_ECDSA_SHA384: signature_algorithm = NX_SECURE_TLS_X509_TYPE_ECDSA_SHA_384; break;case NX_SECURE_TLS_SIGNATURE_ECDSA_SHA384: case NX_SECURE_TLS_SIGNATURE_ECDSA_SHA512: signature_algorithm = NX_SECURE_TLS_X509_TYPE_ECDSA_SHA_512; break;case NX_SECURE_TLS_SIGNATURE_ECDSA_SHA512: default: return(NX_SECURE_TLS_UNSUPPORTED_CERT_SIGN_ALG);default }switch ((UINT)((packet_buffer[0] << 8) + packet_buffer[1])) { ... } }if (tls_session -> nx_secure_tls_1_3) { ... } else #endif { signature_algorithm = NX_SECURE_TLS_X509_TYPE_RSA_SHA_256; #ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE if (client_certificate -> nx_secure_x509_public_algorithm == NX_SECURE_TLS_X509_TYPE_EC) { signature_algorithm = NX_SECURE_TLS_X509_TYPE_ECDSA_SHA_256; }if (client_certificate -> nx_secure_x509_public_algorithm == NX_SECURE_TLS_X509_TYPE_EC) { ... } /* ... */#endif /* NX_SECURE_ENABLE_ECC_CIPHERSUITE */ }else { ... } /* Find certificate crypto methods for the local certificate. */ status = _nx_secure_x509_find_certificate_methods(client_certificate, signature_algorithm, &crypto_methods); if (status != NX_SUCCESS) { /* Translate some X.509 return values into TLS return values. */ if (status == NX_SECURE_X509_UNKNOWN_CERT_SIG_ALGORITHM) { return(NX_SECURE_TLS_UNKNOWN_CERT_SIG_ALGORITHM); }if (status == NX_SECURE_X509_UNKNOWN_CERT_SIG_ALGORITHM) { ... } return(status); }if (status != NX_SUCCESS) { ... } #if (NX_SECURE_TLS_TLS_1_3_ENABLED) if(tls_session -> nx_secure_tls_1_3) { /* TLS 1.3 certificate verify uses a different scheme. The signature is calculated over a concatenation of the following (RFC 8446): - A string that consists of octet 32 (0x20) repeated 64 times - The context string - A single 0 byte which serves as the separator - The content to be signed *//* ... */ UCHAR *transcript_hash = tls_session->nx_secure_tls_key_material.nx_secure_tls_transcript_hashes[NX_SECURE_TLS_TRANSCRIPT_IDX_CERTIFICATE]; /* Set octet padding bytes. */ NX_SECURE_MEMSET(&handshake_hash[0], 0x20, 64); if (tls_session -> nx_secure_tls_socket_type == NX_SECURE_TLS_SESSION_TYPE_CLIENT) { /* Copy in context string and 0-byte separator. */ NX_SECURE_MEMCPY(&handshake_hash[64], server_context, 34); /* Use case of memcpy is verified. */ }if (tls_session -> nx_secure_tls_socket_type == NX_SECURE_TLS_SESSION_TYPE_CLIENT) { ... } else { /* Copy in context string and 0-byte separator. */ NX_SECURE_MEMCPY(&handshake_hash[64], client_context, 34); /* Use case of memcpy is verified. */ }else { ... } /* Copy in transcript hash. */ NX_SECURE_MEMCPY(&handshake_hash[64 + 34], transcript_hash, 32); /* Use case of memcpy is verified. */ handshake_hash_length = 130; /* Generate a hash of the data we just produced. */ /* Use SHA-256 for now... */ hash_method = crypto_methods -> nx_secure_x509_hash_method; metadata = tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch; metadata_size = tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_scratch_size; /* Hash the data using the chosen hash method. */ if (hash_method -> nx_crypto_init) { status = hash_method -> nx_crypto_init((NX_CRYPTO_METHOD*)hash_method, NX_NULL, 0, &handler, metadata, metadata_size); if(status != NX_CRYPTO_SUCCESS) { return(status); }if (status != NX_CRYPTO_SUCCESS) { ... } }if (hash_method -> nx_crypto_init) { ... } 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, metadata, metadata_size, NX_NULL, NX_NULL); if(status != NX_CRYPTO_SUCCESS) { return(status); }if (status != NX_CRYPTO_SUCCESS) { ... } }if (hash_method -> nx_crypto_operation != NX_NULL) { ... } if (hash_method -> nx_crypto_operation != NX_NULL) { status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_UPDATE, tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha256_handler, (NX_CRYPTO_METHOD*)hash_method, NX_NULL, 0, handshake_hash, handshake_hash_length, NX_NULL, NX_NULL, 0, metadata, metadata_size, NX_NULL, NX_NULL); if(status != NX_CRYPTO_SUCCESS) { return(status); }if (status != NX_CRYPTO_SUCCESS) { ... } }if (hash_method -> nx_crypto_operation != NX_NULL) { ... } if (hash_method -> nx_crypto_operation != NX_NULL) { status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_CALCULATE, tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha256_handler, (NX_CRYPTO_METHOD*)hash_method, NX_NULL, 0, NX_NULL, 0, NX_NULL, &handshake_hash[0], sizeof(handshake_hash), metadata, metadata_size, NX_NULL, NX_NULL); if(status != NX_CRYPTO_SUCCESS) { return(status); }if (status != NX_CRYPTO_SUCCESS) { ... } }if (hash_method -> nx_crypto_operation != NX_NULL) { ... } handshake_hash_length = (hash_method -> nx_crypto_ICV_size_in_bits) >> 3; }if (tls_session -> nx_secure_tls_1_3) { ... } else/* ... */ #endif /* Generate the handshake message hash that will need to match the received signature. */ #if (NX_SECURE_TLS_TLS_1_2_ENABLED) #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 */ { /* Calculate our final signature length for later offset calculations. */ signature_length = 19 + 32; /* DER encoding (19) + SHA-256 hash size (32) */ /* Generate a hash of all sent and received handshake messages to this point (not a Finished hash!). */ /* Copy over the handshake hash state into a local structure to do the intermediate calculation. */ NX_SECURE_HASH_METADATA_CLONE(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_sha256_metadata, tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha256_metadata_size); /* Use case of memcpy is verified. */ /* Use SHA-256 for now... */ hash_method = tls_session -> nx_secure_tls_crypto_table -> nx_secure_tls_handshake_hash_sha256_method; if (hash_method -> nx_crypto_operation != NX_NULL) { status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_CALCULATE, tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha256_handler, (NX_CRYPTO_METHOD*)hash_method, NX_NULL, 0, NX_NULL, 0, NX_NULL, &handshake_hash[0], sizeof(handshake_hash), 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_sha256_metadata_size, NX_NULL, NX_NULL); }if (hash_method -> nx_crypto_operation != NX_NULL) { ... } NX_SECURE_HASH_CLONE_CLEANUP(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_sha256_metadata_size); if (status != NX_CRYPTO_SUCCESS) { /* Something failed in the hash calculation. */ return(status); }if (status != NX_CRYPTO_SUCCESS) { ... } ...} /* ... */ #endif #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 */ { /* Signature size is the size of SHA-1 (20) + MD5 (16). */ signature_length = 36; /* Copy over the handshake hash metadata into scratch metadata area to do the intermediate calculation. */ NX_SECURE_HASH_METADATA_CLONE(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_sha1_metadata_size, tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_md5_metadata, tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_md5_metadata_size); /* Use case of memcpy is verified. */ /* Finalize the handshake message hashes that we started at the beginning of the handshake. */ hash_method = tls_session -> nx_secure_tls_crypto_table -> nx_secure_tls_handshake_hash_md5_method; if (hash_method -> nx_crypto_operation != NX_NULL) { status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_CALCULATE, tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_md5_handler, (NX_CRYPTO_METHOD*)hash_method, NX_NULL, 0, NX_NULL, 0, NX_NULL, &handshake_hash[0], 16, 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_sha1_metadata_size, tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_md5_metadata_size, NX_NULL, NX_NULL); }if (hash_method -> nx_crypto_operation != NX_NULL) { ... } NX_SECURE_HASH_CLONE_CLEANUP(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_sha1_metadata_size, tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_md5_metadata_size); if (status != NX_CRYPTO_SUCCESS) { /* Something failed in the hash calculation. */ return(status); }if (status != NX_CRYPTO_SUCCESS) { ... } NX_SECURE_HASH_METADATA_CLONE(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_sha1_metadata, tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha1_metadata_size); /* Use case of memcpy is verified. */ hash_method = tls_session -> nx_secure_tls_crypto_table -> nx_secure_tls_handshake_hash_sha1_method; if (hash_method -> nx_crypto_operation != NX_NULL) { status = hash_method -> nx_crypto_operation(NX_CRYPTO_HASH_CALCULATE, tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha1_handler, (NX_CRYPTO_METHOD*)hash_method, NX_NULL, 0, NX_NULL, 0, NX_NULL, &handshake_hash[16], sizeof(handshake_hash) - 16, 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_sha1_metadata_size, NX_NULL, NX_NULL); }if (hash_method -> nx_crypto_operation != NX_NULL) { ... } NX_SECURE_HASH_CLONE_CLEANUP(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_sha1_metadata_size); if (status != NX_CRYPTO_SUCCESS) { /* Something failed in the hash calculation. */ #ifdef NX_SECURE_KEY_CLEAR NX_SECURE_MEMSET(handshake_hash, 0, sizeof(handshake_hash)); #endif /* NX_SECURE_KEY_CLEAR */ return(status); }if (status != NX_CRYPTO_SUCCESS) { ... } ...}/* ... */ #endif /* Make sure we found a supported version (essentially an assertion check). */ if (hash_method == NX_NULL) { /* No hash method means we don't need to clear "handshake_hash" buffer. */ return(NX_SECURE_TLS_UNSUPPORTED_TLS_VERSION); }if (hash_method == NX_NULL) { ... } /* Start with a clear buffer for our decrypted signature data. */ NX_SECURE_MEMSET(_nx_secure_decrypted_signature, 0x0, sizeof(_nx_secure_decrypted_signature)); length = 0; /* Get our public-key crypto method. */ public_cipher_method = crypto_methods -> nx_secure_x509_public_cipher_method; /* Use RSA? */ if (client_certificate -> nx_secure_x509_public_algorithm == NX_SECURE_TLS_X509_TYPE_RSA) { #if (NX_SECURE_TLS_TLS_1_2_ENABLED) #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 */ { /* Check the signature method. */ if (packet_buffer[0] != NX_SECURE_TLS_HASH_ALGORITHM_SHA256 || packet_buffer[1] != NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA) { return(NX_SECURE_TLS_UNKNOWN_CERT_SIG_ALGORITHM); }if (packet_buffer[0] != NX_SECURE_TLS_HASH_ALGORITHM_SHA256 || packet_buffer[1] != NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA) { ... } /* Get the length of the encrypted signature data. */ length = (UINT)((packet_buffer[2] << 8) + packet_buffer[3]); if (length != client_certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_modulus_length) { return(NX_SECURE_TLS_CERTIFICATE_SIG_CHECK_FAILED); }if (length != client_certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_modulus_length) { ... } /* Pointer to the received signature that we need to check. */ received_signature = &packet_buffer[4]; ...}/* ... */ #endif #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 */ { /* Get the length of the encrypted signature data. */ length = (UINT)((packet_buffer[0] << 8) + packet_buffer[1]); if (length != client_certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_modulus_length) { return(NX_SECURE_TLS_CERTIFICATE_SIG_CHECK_FAILED); }if (length != client_certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_modulus_length) { ... } /* Pointer to the received signature that we need to check. */ received_signature = &packet_buffer[2]; ...}/* ... */ #endif /* Length sanity check. */ if (length > message_length ) { /* Incoming message was too long! */ return(NX_SECURE_TLS_INCORRECT_MESSAGE_LENGTH); }if (length > message_length) { ... } /* If using RSA, the length is equal to the key size. */ data_size = client_certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_modulus_length; if (public_cipher_method -> nx_crypto_init != NX_NULL) { /* Initialize the crypto method with public key. */ status = public_cipher_method -> nx_crypto_init((NX_CRYPTO_METHOD*)public_cipher_method, (UCHAR *)client_certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_modulus, (NX_CRYPTO_KEY_SIZE)(client_certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_modulus_length << 3), &handler, client_certificate -> nx_secure_x509_public_cipher_metadata_area, client_certificate -> nx_secure_x509_public_cipher_metadata_size); if (status != NX_CRYPTO_SUCCESS) { /* Something failed in setting up the public cipher. */ #ifdef NX_SECURE_KEY_CLEAR NX_SECURE_MEMSET(handshake_hash, 0, sizeof(handshake_hash)); #endif /* NX_SECURE_KEY_CLEAR */ return(status); }if (status != NX_CRYPTO_SUCCESS) { ... } }if (public_cipher_method -> nx_crypto_init != NX_NULL) { ... } if (public_cipher_method -> nx_crypto_operation != NX_NULL) { /* Decrypt the hash we received using the remote host's public key. */ status = public_cipher_method -> nx_crypto_operation(NX_CRYPTO_DECRYPT, handler, (NX_CRYPTO_METHOD*)public_cipher_method, (UCHAR *)client_certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_exponent, (NX_CRYPTO_KEY_SIZE)(client_certificate -> nx_secure_x509_public_key.rsa_public_key.nx_secure_rsa_public_exponent_length << 3), received_signature, data_size, NX_NULL, _nx_secure_decrypted_signature, sizeof(_nx_secure_decrypted_signature), client_certificate -> nx_secure_x509_public_cipher_metadata_area, client_certificate -> nx_secure_x509_public_cipher_metadata_size, NX_NULL, NX_NULL); if (status != NX_CRYPTO_SUCCESS) { /* Something failed in the cipher operation. */ #ifdef NX_SECURE_KEY_CLEAR NX_SECURE_MEMSET(handshake_hash, 0, sizeof(handshake_hash)); #endif /* NX_SECURE_KEY_CLEAR */ return(status); }if (status != NX_CRYPTO_SUCCESS) { ... } }if (public_cipher_method -> nx_crypto_operation != NX_NULL) { ... } if (public_cipher_method -> nx_crypto_cleanup) { status = public_cipher_method -> nx_crypto_cleanup(client_certificate -> nx_secure_x509_public_cipher_metadata_area); if (status != NX_CRYPTO_SUCCESS) { /* Something failed in the cipher operation. */ #ifdef NX_SECURE_KEY_CLEAR NX_SECURE_MEMSET(handshake_hash, 0, sizeof(handshake_hash)); NX_SECURE_MEMSET(_nx_secure_decrypted_signature, 0, sizeof(_nx_secure_decrypted_signature));/* ... */ #endif /* NX_SECURE_KEY_CLEAR */ return(status); }if (status != NX_CRYPTO_SUCCESS) { ... } }if (public_cipher_method -> nx_crypto_cleanup) { ... } /* Check PKCS-1 Signature padding. The scheme is to start with the block type (0x00, 0x01 for signing) then pad with 0xFF bytes (for signing) followed with a single 0 byte right before the payload, which comes at the end of the RSA block. *//* ... */ /* Block type is 0x00, 0x01 for signatures */ if (_nx_secure_decrypted_signature[0] != 0x0 && _nx_secure_decrypted_signature[1] != 0x1) { #ifdef NX_SECURE_KEY_CLEAR NX_SECURE_MEMSET(handshake_hash, 0, sizeof(handshake_hash)); NX_SECURE_MEMSET(_nx_secure_decrypted_signature, 0, sizeof(_nx_secure_decrypted_signature));/* ... */ #endif /* NX_SECURE_KEY_CLEAR */ /* Unknown block type. */ return(NX_SECURE_TLS_PADDING_CHECK_FAILED); }if (_nx_secure_decrypted_signature[0] != 0x0 && _nx_secure_decrypted_signature[1] != 0x1) { ... } /* Check padding. */ for (i = 2; i < (data_size - signature_length - 1); ++i) { if (_nx_secure_decrypted_signature[i] != (UCHAR)0xFF) { #ifdef NX_SECURE_KEY_CLEAR NX_SECURE_MEMSET(handshake_hash, 0, sizeof(handshake_hash)); NX_SECURE_MEMSET(_nx_secure_decrypted_signature, 0, sizeof(_nx_secure_decrypted_signature));/* ... */ #endif /* NX_SECURE_KEY_CLEAR */ /* Bad padding value. */ return(NX_SECURE_TLS_PADDING_CHECK_FAILED); }if (_nx_secure_decrypted_signature[i] != (UCHAR)0xFF) { ... } }for (i = 2; i < (data_size - signature_length - 1); ++i) { ... } /* Check the received handshake hash against what we generated above. */ /* Assure that we fail if anything goes wrong with the comparison. */ compare_value = 1; #if (NX_SECURE_TLS_TLS_1_2_ENABLED) #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 */ { /* Get a working pointer into the padded signature buffer. All PKCS-1 encoded data comes at the end of the RSA encrypted block. *//* ... */ working_ptr = &_nx_secure_decrypted_signature[data_size - signature_length]; /* Check the DER encoding. */ compare_value = NX_SECURE_MEMCMP(&working_ptr[0], _NX_SECURE_OID_SHA256, 19); /* Check the handshake hash. */ compare_value += NX_SECURE_MEMCMP(&working_ptr[19], handshake_hash, 32); ...}/* ... */ #endif #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 */ { /* Get a working pointer into the padded signature buffer. All PKCS-1 encoded data comes at the end of the RSA encrypted block. *//* ... */ working_ptr = &_nx_secure_decrypted_signature[data_size - signature_length]; /* Now put the data into the padded buffer - must be at the end. */ compare_value = NX_SECURE_MEMCMP(working_ptr, handshake_hash, 36); ...}/* ... */ #endif }if (client_certificate -> nx_secure_x509_public_algorithm == NX_SECURE_TLS_X509_TYPE_RSA) { ... } #ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE else if (client_certificate -> nx_secure_x509_public_algorithm == NX_SECURE_TLS_X509_TYPE_EC) { /* Verify the ECDSA signature. */ #if (NX_SECURE_TLS_TLS_1_2_ENABLED) #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 */ { #if (NX_SECURE_TLS_TLS_1_3_ENABLED) if (tls_session -> nx_secure_tls_1_3) { data_size = handshake_hash_length; }if (tls_session -> nx_secure_tls_1_3) { ... } else #endif { /* Check the signature method. */ if(packet_buffer[0] != NX_SECURE_TLS_HASH_ALGORITHM_SHA256 || packet_buffer[1] != NX_SECURE_TLS_SIGNATURE_ALGORITHM_ECDSA) { #ifdef NX_SECURE_KEY_CLEAR NX_SECURE_MEMSET(handshake_hash, 0, sizeof(handshake_hash)); NX_SECURE_MEMSET(_nx_secure_decrypted_signature, 0, sizeof(_nx_secure_decrypted_signature));/* ... */ #endif /* NX_SECURE_KEY_CLEAR */ return(NX_SECURE_TLS_UNKNOWN_CERT_SIG_ALGORITHM); }if (packet_buffer[0] != NX_SECURE_TLS_HASH_ALGORITHM_SHA256 || packet_buffer[1] != NX_SECURE_TLS_SIGNATURE_ALGORITHM_ECDSA) { ... } /* Hash size is SHA-256 hash size (32). */ data_size = 32; }else { ... } /* Get the length of the ECDSA signature data. */ length = (UINT)((packet_buffer[2] << 8) + packet_buffer[3]); /* Pointer to the received signature that we need to check. */ received_signature = &packet_buffer[4]; ...}/* ... */ #endif #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 */ { /* Get the length of the ECDSA signature data. */ length = (UINT)((packet_buffer[0] << 8) + packet_buffer[1]); /* Pointer to the received signature that we need to check. */ received_signature = &packet_buffer[2]; /* Hash size is the size of SHA-1 (20) + MD5 (16). */ data_size = 36; ...}/* ... */ #endif ec_pubkey = &client_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); #ifdef NX_SECURE_KEY_CLEAR if(status != NX_SUCCESS || curve_method_cert == NX_NULL) { /* Clear secrets on errors. */ NX_SECURE_MEMSET(handshake_hash, 0, sizeof(handshake_hash)); NX_SECURE_MEMSET(_nx_secure_decrypted_signature, 0, sizeof(_nx_secure_decrypted_signature)); }if (status != NX_SUCCESS || curve_method_cert == NX_NULL) { ... } /* ... */#endif /* NX_SECURE_KEY_CLEAR */ if (status != NX_SUCCESS) { return(status); }if (status != NX_SUCCESS) { ... } if (curve_method_cert == NX_NULL) { /* The remote certificate is using an unsupported curve. */ return(NX_SECURE_TLS_UNSUPPORTED_ECC_CURVE); }if (curve_method_cert == NX_NULL) { ... } if (public_cipher_method -> nx_crypto_init != NX_NULL) { status = public_cipher_method -> nx_crypto_init((NX_CRYPTO_METHOD*)public_cipher_method, (UCHAR *)ec_pubkey -> nx_secure_ec_public_key, (NX_CRYPTO_KEY_SIZE)(ec_pubkey -> nx_secure_ec_public_key_length << 3), &handler, client_certificate -> nx_secure_x509_public_cipher_metadata_area, client_certificate -> nx_secure_x509_public_cipher_metadata_size); if (status != NX_CRYPTO_SUCCESS) { #ifdef NX_SECURE_KEY_CLEAR NX_SECURE_MEMSET(handshake_hash, 0, sizeof(handshake_hash)); NX_SECURE_MEMSET(_nx_secure_decrypted_signature, 0, sizeof(_nx_secure_decrypted_signature));/* ... */ #endif /* NX_SECURE_KEY_CLEAR */ return(status); }if (status != NX_CRYPTO_SUCCESS) { ... } }if (public_cipher_method -> nx_crypto_init != NX_NULL) { ... } if (public_cipher_method -> nx_crypto_operation == NX_NULL) { #ifdef NX_SECURE_KEY_CLEAR NX_SECURE_MEMSET(handshake_hash, 0, sizeof(handshake_hash)); NX_SECURE_MEMSET(_nx_secure_decrypted_signature, 0, sizeof(_nx_secure_decrypted_signature));/* ... */ #endif /* NX_SECURE_KEY_CLEAR */ return(NX_SECURE_TLS_MISSING_CRYPTO_ROUTINE); }if (public_cipher_method -> nx_crypto_operation == NX_NULL) { ... } status = public_cipher_method -> nx_crypto_operation(NX_CRYPTO_EC_CURVE_SET, handler, (NX_CRYPTO_METHOD*)public_cipher_method, NX_NULL, 0, (UCHAR *)curve_method_cert, sizeof(NX_CRYPTO_METHOD *), NX_NULL, NX_NULL, 0, client_certificate -> nx_secure_x509_public_cipher_metadata_area, client_certificate -> nx_secure_x509_public_cipher_metadata_size, NX_NULL, NX_NULL); if (status != NX_CRYPTO_SUCCESS) { #ifdef NX_SECURE_KEY_CLEAR NX_SECURE_MEMSET(handshake_hash, 0, sizeof(handshake_hash)); NX_SECURE_MEMSET(_nx_secure_decrypted_signature, 0, sizeof(_nx_secure_decrypted_signature));/* ... */ #endif /* NX_SECURE_KEY_CLEAR */ return(status); }if (status != NX_CRYPTO_SUCCESS) { ... } if (((ULONG)packet_buffer + message_length) < ((ULONG)received_signature + length)) { return(NX_SECURE_X509_ASN1_LENGTH_TOO_LONG); }if (((ULONG)packet_buffer + message_length) < ((ULONG)received_signature + length)) { ... } status = public_cipher_method -> nx_crypto_operation(NX_CRYPTO_VERIFY, handler, (NX_CRYPTO_METHOD*)public_cipher_method, (UCHAR *)ec_pubkey -> nx_secure_ec_public_key, (NX_CRYPTO_KEY_SIZE)(ec_pubkey -> nx_secure_ec_public_key_length << 3), handshake_hash, data_size, NX_NULL, received_signature, length, client_certificate -> nx_secure_x509_public_cipher_metadata_area, client_certificate -> nx_secure_x509_public_cipher_metadata_size, NX_NULL, NX_NULL); if (status == NX_CRYPTO_SUCCESS) { compare_value = 0; }if (status == NX_CRYPTO_SUCCESS) { ... } else { compare_value = 1; }else { ... } if (public_cipher_method -> nx_crypto_cleanup) { status = public_cipher_method -> nx_crypto_cleanup(client_certificate -> nx_secure_x509_public_cipher_metadata_area); if(status != NX_CRYPTO_SUCCESS) { #ifdef NX_SECURE_KEY_CLEAR NX_SECURE_MEMSET(handshake_hash, 0, sizeof(handshake_hash)); NX_SECURE_MEMSET(_nx_secure_decrypted_signature, 0, sizeof(_nx_secure_decrypted_signature));/* ... */ #endif /* NX_SECURE_KEY_CLEAR */ return(status); }if (status != NX_CRYPTO_SUCCESS) { ... } }if (public_cipher_method -> nx_crypto_cleanup) { ... } }else if (client_certificate -> nx_secure_x509_public_algorithm == NX_SECURE_TLS_X509_TYPE_EC) { ... } /* ... */#endif /* NX_SECURE_ENABLE_ECC_CIPHERSUITE */ else { /* Unknown or unsupported public-key operation. No secrets to clear. *//* ... */ return(NX_SECURE_TLS_UNSUPPORTED_PUBLIC_CIPHER); }else { ... } #ifdef NX_SECURE_KEY_CLEAR NX_SECURE_MEMSET(handshake_hash, 0, sizeof(handshake_hash)); NX_SECURE_MEMSET(_nx_secure_decrypted_signature, 0, sizeof(_nx_secure_decrypted_signature));/* ... */ #endif /* NX_SECURE_KEY_CLEAR */ if (compare_value) { /* The hash value did not compare, so something has gone wrong. */ return(NX_SECURE_TLS_CERTIFICATE_VERIFY_FAILURE); }if (compare_value) { ... } return(NX_SUCCESS); }{ ... }