123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300 |
- /*
- * Copyright (C) 2011-2017 Intel Corporation. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * * Neither the name of Intel Corporation nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
- #include "Decryptor.h"
- #include "sgx_tseal.h"
- #include "sgx_tcrypto.h"
- #include "sgx_dh.h"
- #include "datatypes.h"
- #include "error_codes.h"
- ECDSASignatureBox Decryptor::signatureBox;
- HybridEncryptionBox Decryptor::hybridEncryptionBoxClient;
- SymmetricEncryptionBox Decryptor::symmetricEncryptionBoxApache;
- SymmetricEncryptionBox Decryptor::symmetricEncryptionBoxVerifier;
- uint8_t Decryptor::verifier_mr_enclave[32] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
- uint8_t Decryptor::apache_mr_signer[32] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
- uint32_t Decryptor::create_mitigator_token_M(uint8_t* token)
- {
- uint32_t internal_return_status;
- uint32_t counter;
- // create short-term ECDH key pair
- internal_return_status = hybridEncryptionBoxClient.generate_keypair();
- if(internal_return_status == NULL)
- return 0xff;
- hybridEncryptionBoxClient.get_public_key(token);
- // create token: concatenate short-term keypair with verifiers mrenclave.
- for(counter=0;counter<32;counter++)
- *(token + counter + ECDH_PUBLIC_KEY_SIZE) = verifier_mr_enclave[counter];
- return 0;
- }
- uint32_t Decryptor::create_mitigator_header_H(uint8_t* signature_data, uint8_t* signature)
- {
- uint32_t internal_return_status;
- uint8_t local_signature[64];
- uint8_t local_signature_data[ECDH_PUBLIC_KEY_SIZE + 32];
- uint32_t counter;
- // Otherwise: DoS or possible bypass (fake verifier does LA but real verifier mrenclave is given out by decryptor) - signature with junk verifier mrenclave or whatever is in the memory.
- if(LocalAttestationTrusted::get_one_successful_la_done() < 1)
- return 0xde; // This needs to be called at any point after the first local attestation is done - else, a junk verifier mrenclave will be included in the signature
- internal_return_status = Decryptor::create_mitigator_token_M(local_signature_data);
- if(internal_return_status != 0x0)
- return internal_return_status;
- internal_return_status = signatureBox.sign(local_signature_data, ECDH_PUBLIC_KEY_SIZE + 32, local_signature);
- if(internal_return_status != 0x0)
- return internal_return_status;
- for(counter=0;counter<ECDH_PUBLIC_KEY_SIZE + 32;counter++)
- signature_data[counter] = local_signature_data[counter];
- for(counter=0;counter<64;counter++)
- signature[counter] = local_signature[counter];
- return 0;
- }
- // done. But there might be one more return statement for the case when get_keypair returns sth (it is non void).
- uint32_t Decryptor::create_long_term_signing_keypair(uint8_t* private_public_key_string)
- {
- uint32_t internal_return_status;
- internal_return_status = signatureBox.generate_keypair();
- if(internal_return_status != 0)
- return internal_return_status;
- signatureBox.get_keypair(private_public_key_string);
- return 0;
- }
- uint32_t Decryptor::initialize_symmetric_key_decrypt_client_data(uint8_t* plaintext_client_public_key_plus_encrypted_data_plus_tag, uint32_t total_length, uint8_t* plaintext_client_data, uint32_t* plaintext_client_data_length)
- {
- uint8_t* ciphertext;
- uint32_t ciphertext_length;
- uint8_t* tag;
- uint32_t internal_return_status;
- // and now I will derive a shared key from the plaintext_client_public_key
- internal_return_status = hybridEncryptionBoxClient.initialize_symmetric_key(plaintext_client_public_key_plus_encrypted_data_plus_tag);
- if(internal_return_status != 0)
- return internal_return_status;
- // and then I will decrypt the rest of the client data with that key.
- ciphertext = plaintext_client_public_key_plus_encrypted_data_plus_tag + ECDH_PUBLIC_KEY_SIZE;
- ciphertext_length = total_length - ECDH_PUBLIC_KEY_SIZE - 16;
- tag = ciphertext + ciphertext_length;
- internal_return_status = hybridEncryptionBoxClient.encrypt_decrypt(0, ciphertext, ciphertext_length, plaintext_client_data, plaintext_client_data_length, tag);
- return internal_return_status;
- }
- // DONE.
- uint32_t Decryptor::create_and_seal_long_term_signing_key_pair(uint32_t* sealed_data_length, uint8_t* sealed_data)
- {
- uint32_t sgx_libcall_status;
- uint32_t internal_return_status;
- uint32_t temp_sealed_data_length;
- uint8_t* temp_sealed_data;
- uint8_t private_public_key_string[ECDH_PUBLIC_KEY_SIZE + ECDH_PRIVATE_KEY_SIZE];
- uint32_t counter;
- temp_sealed_data_length = sgx_calc_sealed_data_size(0, ECDH_PUBLIC_KEY_SIZE + ECDH_PRIVATE_KEY_SIZE);
- if(temp_sealed_data_length == 0xFFFFFFFF)
- return 0x01;
- internal_return_status = create_long_term_signing_keypair(private_public_key_string);
- temp_sealed_data = (uint8_t*) malloc(temp_sealed_data_length);
- sgx_libcall_status = sgx_seal_data(0, NULL, 3*SGX_ECP256_KEY_SIZE, private_public_key_string, temp_sealed_data_length, (sgx_sealed_data_t*) temp_sealed_data);
- if(sgx_libcall_status != SGX_SUCCESS)
- {
- free(temp_sealed_data);
- return sgx_libcall_status;
- }
- for(counter=0;counter<temp_sealed_data_length;counter++)
- *(sealed_data + counter)=*(temp_sealed_data + counter);
- *sealed_data_length = temp_sealed_data_length;
- free(temp_sealed_data);
- return 0;
- }
- // DONE.
- uint32_t Decryptor::create_and_encrypt_mitigator_header_H(uint8_t* ciphertext_token_H_plus_tag)
- {
- uint32_t counter;
- uint8_t sign_data_and_sign[ECDH_PUBLIC_KEY_SIZE + 32 + 64];
- uint8_t temp_ciphertext_token_H[ECDH_PUBLIC_KEY_SIZE + 32 + 64 + 10];
- uint8_t temp_tag[16];
- uint32_t temp_ciphertext_token_H_length;
- uint32_t internal_return_status;
- internal_return_status = create_mitigator_header_H(sign_data_and_sign, sign_data_and_sign + ECDH_PUBLIC_KEY_SIZE + 32);
- if(internal_return_status != 0)
- return internal_return_status;
- internal_return_status = symmetricEncryptionBoxApache.encrypt_decrypt(1, sign_data_and_sign, ECDH_PUBLIC_KEY_SIZE + 32 + 64, temp_ciphertext_token_H, &temp_ciphertext_token_H_length, temp_tag);
- if(internal_return_status != 0)
- return internal_return_status;
- if(temp_ciphertext_token_H_length != 160)
- return 0x45;
- for(counter=0; counter<160; counter++)
- {
- *(ciphertext_token_H_plus_tag + counter) = *(temp_ciphertext_token_H + counter);
- }
- for(counter=0; counter<16; counter++)
- {
- *(ciphertext_token_H_plus_tag + counter) = *(temp_tag + counter);
- }
- return 0;
- }
- // DONE.
- uint32_t Decryptor::unseal_and_restore_long_term_signing_key_pair(uint8_t* sealed_data, uint32_t* sgx_sealed_data_length)
- {
- uint32_t temp_plaintext_length;
- uint8_t* temp_plaintext;
- uint32_t counter;
- uint32_t ret_status;
- uint8_t* temp_sealed_data ;
- temp_sealed_data = (uint8_t*) malloc(*sgx_sealed_data_length);
- for(counter=0;counter<*sgx_sealed_data_length;counter++)
- *(temp_sealed_data+counter)=*(sealed_data+counter);
- temp_plaintext_length = sgx_get_encrypt_txt_len((sgx_sealed_data_t*)sealed_data);
- if(temp_plaintext_length == 0xffffffff)
- return 0xFFFFFFFF;
- temp_plaintext = (uint8_t*)malloc( temp_plaintext_length );
- ret_status = sgx_unseal_data((sgx_sealed_data_t*)temp_sealed_data, NULL, 0, temp_plaintext, &temp_plaintext_length);
- free(temp_sealed_data);
- if(ret_status != SGX_SUCCESS)
- {
- free(temp_plaintext);
- return ret_status;
- }
- signatureBox.set_private_public_key(temp_plaintext, temp_plaintext + ECDH_PRIVATE_KEY_SIZE);
- free(temp_plaintext);
- return 0;
- }
- // DONE.
- uint32_t Decryptor::decrypt_verifiers_message_set_apache_mrsigner(uint8_t* ciphertext_plus_tag)
- {
- uint8_t temp_apache_mrsigner[32+10];
- uint32_t temp_apache_mrsigner_length;
- uint32_t internal_return_status;
- uint32_t counter;
- uint8_t* tag;
- tag = ciphertext_plus_tag + 32;
- internal_return_status = symmetricEncryptionBoxVerifier.encrypt_decrypt(0, ciphertext_plus_tag, 32, temp_apache_mrsigner, &temp_apache_mrsigner_length, tag);
- if(internal_return_status != 0)
- return internal_return_status;
- if(temp_apache_mrsigner_length != 32)
- return 0x33;
- for(counter=0; counter<32; counter++)
- {
- apache_mr_signer[counter] = *(temp_apache_mrsigner + counter);
- }
- return 0;
- }
- // DONE.
- uint32_t Decryptor::process_apache_message_generate_response(uint8_t* input_ciphertext, uint32_t input_ciphertext_plus_tag_length, uint8_t* output_ciphertext_plus_tag, uint32_t* output_ciphertext_plus_tag_length)
- {
- uint8_t *first_decryption_output, *plaintext_client_data, *temp_output_ciphertext;
- uint32_t first_decryption_output_length, plaintext_client_data_length;
- uint32_t temp_output_ciphertext_length, internal_return_status;
- uint8_t temp_output_tag[16]; uint32_t counter;
- // TODO: May be have temporary variables for input ciphertext as they can't be passed directly to functions?
- first_decryption_output = (uint8_t*) malloc(input_ciphertext_plus_tag_length);
- internal_return_status = symmetricEncryptionBoxApache.encrypt_decrypt(0, input_ciphertext, input_ciphertext_plus_tag_length, first_decryption_output, &first_decryption_output_length, input_ciphertext + input_ciphertext_plus_tag_length - 16);
- if(internal_return_status != 0)
- {
- free(first_decryption_output);
- return internal_return_status;
- }
- plaintext_client_data = (uint8_t*) malloc(first_decryption_output_length); // you will need less than this coz public key size.
- internal_return_status = initialize_symmetric_key_decrypt_client_data(first_decryption_output, first_decryption_output_length, plaintext_client_data, &plaintext_client_data_length);
- free(first_decryption_output);
- if(internal_return_status != 0)
- return internal_return_status;
- temp_output_ciphertext = (uint8_t*) malloc(plaintext_client_data_length + 20);
- // then I will encrypt the resulting first_decryption_output to the apache enclave.
- internal_return_status = symmetricEncryptionBoxApache.encrypt_decrypt(1, plaintext_client_data, plaintext_client_data_length, temp_output_ciphertext, &temp_output_ciphertext_length, temp_output_tag);
- free(plaintext_client_data);
- if(internal_return_status != 0)
- {
- free(temp_output_ciphertext);
- return internal_return_status;
- }
- for(counter=0; counter<temp_output_ciphertext_length; counter++)
- output_ciphertext_plus_tag[counter] = temp_output_ciphertext[counter];
- free(temp_output_ciphertext);
- for(counter=0; counter<16;counter++)
- output_ciphertext_plus_tag[counter] = temp_output_tag[counter];
- *output_ciphertext_plus_tag_length = temp_output_ciphertext_length + 16;
- return 0;
- }
- uint32_t Decryptor::verify_peer_enclave_trust(uint8_t* given_mr_enclave, uint8_t* given_mr_signer, uint8_t* dhaek)
- {
- uint32_t count;
- if(LocalAttestationTrusted::get_one_successful_la_done() == 0)
- {
- for(count=0; count<SGX_HASH_SIZE; count++)
- verifier_mr_enclave[count] = given_mr_enclave[count];
- symmetricEncryptionBoxVerifier.set_symmetric_key(dhaek);
- }
- else // apache enclave
- {
- for(count=0; count<SGX_HASH_SIZE; count++)
- {
- if( given_mr_signer[count] != apache_mr_signer[count] )
- return ENCLAVE_TRUST_ERROR;
- }
- symmetricEncryptionBoxApache.set_symmetric_key(dhaek);
- }
- return SGX_SUCCESS;
- }
|