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- /*
- * 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 "sgx_trts.h"
- #include "sgx_utils.h"
- #include "EnclaveMessageExchange.h"
- #include "sgx_eid.h"
- #include "error_codes.h"
- #include "sgx_ecp_types.h"
- #include "sgx_thread.h"
- #include <map>
- #include "dh_session_protocol.h"
- #include "sgx_dh.h"
- #include "sgx_tcrypto.h"
- #include "LocalAttestationCode_t.h"
- #include "sgx_tseal.h"
- #ifdef __cplusplus
- extern "C" {
- #endif
- uint32_t verify_peer_enclave_trust(sgx_dh_session_enclave_identity_t* peer_enclave_identity, sgx_measurement_t* measurement);
- #ifdef __cplusplus
- }
- #endif
- uint32_t create_ecdsa_key_pair(sgx_ec256_public_t* pub_key, sgx_ec256_private_t* priv_key);
- void serialize_key_pair_to_string( sgx_ec256_public_t* pub_key, sgx_ec256_private_t* signing_priv_key, uint8_t* private_public_key_string);
- void deserialize_string_to_key_pair(uint8_t* private_public_key_string, sgx_ec256_public_t* pub_key, sgx_ec256_private_t* priv_key);
-
- #define MAX_SESSION_COUNT 16
- //number of open sessions
- // uint32_t g_session_count = 0;
- ATTESTATION_STATUS generate_session_id(uint32_t *session_id);
- ATTESTATION_STATUS end_session();
- sgx_ec256_private_t signing_priv_key;
- sgx_ec256_private_t short_term_priv_key;
- sgx_ec256_public_t short_term_pub_key; // for testing only: to test verification of signature
- uint32_t one_la_done;
- sgx_measurement_t verifier_mr_enclave;
- sgx_measurement_t apache_mr_signer;
- sgx_ecc_state_handle_t ecc_state;
- uint32_t session_ids[MAX_SESSION_COUNT];
- // Our enclave will not be doing LA with more than 1 decryptor enclave at a time.
- // We should not need this.
- //std::map<int, dh_session_t>g_dest_session_info_map;
- dh_session_t global_session_info;
- // TODO: May be we need to store all previously assigned session IDs instead of just the counter; to prevent replay attacks -
- uint32_t global_session_id=0;
- //Handle the request from Source Enclave for a session
- ATTESTATION_STATUS session_request(sgx_dh_msg1_t *dh_msg1,
- uint32_t *session_id )
- {
- // dh_session_t session_info;
- sgx_dh_session_t sgx_dh_session;
- sgx_status_t status = SGX_SUCCESS;
- if(!session_id || !dh_msg1)
- {
- return INVALID_PARAMETER_ERROR;
- }
- //Intialize the session as a session responder
- status = sgx_dh_init_session(SGX_DH_SESSION_RESPONDER, &sgx_dh_session);
- if(SGX_SUCCESS != status)
- {
- return status;
- }
- *session_id=1;
- global_session_info.status = IN_PROGRESS;
- //Generate Message1 that will be returned to Source Enclave
- status = sgx_dh_responder_gen_msg1((sgx_dh_msg1_t*)dh_msg1, &sgx_dh_session);
- if(SGX_SUCCESS != status)
- {
- global_session_id--;
- // SAFE_FREE(g_session_id_tracker[*session_id]);
- return status;
- }
- memcpy(&global_session_info.in_progress.dh_session, &sgx_dh_session, sizeof(sgx_dh_session_t));
- //return sgx_seal_data(0, NULL, 0, NULL, 0, NULL);
- //Store the session information under the correspoding source enlave id key
- // g_dest_session_info_map.insert(std::pair<sgx_enclave_id_t, dh_session_t>(src_enclave_id, session_info));
- return status;
- }
- //Verify Message 2, generate Message3 and exchange Message 3 with Source Enclave
- ATTESTATION_STATUS exchange_report(
- sgx_dh_msg2_t *dh_msg2,
- sgx_dh_msg3_t *dh_msg3,
- uint32_t* session_id)
- {
- sgx_key_128bit_t dh_aek; // Session key
- // dh_session_t session_info;
- ATTESTATION_STATUS status = SUCCESS;
- sgx_dh_session_t sgx_dh_session;
- sgx_dh_session_enclave_identity_t initiator_identity;
- if(!dh_msg2 || !dh_msg3)
- {
- return INVALID_PARAMETER_ERROR;
- }
- memset(&dh_aek,0, sizeof(sgx_key_128bit_t));
- // Why is there a do-while loop anyway? It seems like there is no successful exit ...
- // do
- // {
- // TODO: Make sure that this works - pointers
- // session_info = global_session_info;
- if(global_session_info.status != IN_PROGRESS)
- {
- status = INVALID_SESSION;
- end_session();
- }
- memcpy(&sgx_dh_session, &global_session_info.in_progress.dh_session, sizeof(sgx_dh_session_t));
- dh_msg3->msg3_body.additional_prop_length = 0;
- //Process message 2 from source enclave and obtain message 3
- sgx_status_t se_ret = sgx_dh_responder_proc_msg2(dh_msg2,
- dh_msg3,
- &sgx_dh_session,
- &dh_aek,
- &initiator_identity);
- if(SGX_SUCCESS != se_ret)
- {
- status = se_ret;
- end_session();
- }
- uint32_t hash_count;
- // THIS IS WHERE THE DECRYPTOR VERIFIES THE APACHE'S MRSIGNER IS THE PUBLIC KEY GIVEN AFTER THE LOCAL ATTESTATION WITH THE VERIFIER.
- //Verify source enclave's trust
- if(one_la_done == 0)
- {
- one_la_done = 1;
- uint32_t ret = verify_peer_enclave_trust(&initiator_identity, NULL);
- if(ret != SUCCESS)
- {
- return ret; //INVALID_SESSION;
- }
- for(hash_count=0; hash_count<32; hash_count++)
- verifier_mr_enclave.m[hash_count] = initiator_identity.mr_signer.m[hash_count];
- }
- else
- {
- return 0xFFFFFFFF;
- /*
- uint32_t ret = verify_peer_enclave_trust(&initiator_identity, &apache_mrsigner);
- if(ret != SUCCESS)
- {
- return ret; //INVALID_SESSION;
- }
- */
- }
- // TODO: Verify that these changes will be lost on update.
- //save the session ID, status and initialize the session nonce
- global_session_info.session_id = *session_id;
- global_session_info.status = ACTIVE;
- global_session_info.active.counter = 0;
- memcpy(&global_session_info.active.AEK, &dh_aek, sizeof(sgx_key_128bit_t));
- memset(&dh_aek,0, sizeof(sgx_key_128bit_t));
- //g_session_count++;*/
- // }while(0);
- return status;
- }
- uint32_t create_ecdsa_key_pair(sgx_ec256_public_t* pub_key, sgx_ec256_private_t* priv_key)
- {
- sgx_status_t se_ret; sgx_status_t se_ret2;
- //create ECC context
- ecc_state = NULL;
- se_ret = sgx_ecc256_open_context(&ecc_state);
- if(SGX_SUCCESS != se_ret)
- return se_ret;
- // generate private key and public key
- se_ret = sgx_ecc256_create_key_pair(priv_key, pub_key, ecc_state);
- se_ret2 = sgx_ecc256_close_context(ecc_state);
- if(SGX_SUCCESS != se_ret || se_ret2!= SGX_SUCCESS) // something weird has happened - couldn't shut it down.
- return 0xFFFFFFFF;
- return SGX_SUCCESS;
- }
- // todo: set to private
- // todo: assumes that the length of the keystring is at least 3*SGX_ECP256_KEY_SIZE
- void serialize_key_pair_to_string(sgx_ec256_public_t* pub_key, sgx_ec256_private_t* signing_priv_key, uint8_t* private_public_key_string)
- {
- if(private_public_key_string != NULL) // nowhere to serialize to
- {
- uint32_t counter;
- if(pub_key != NULL) // public key to serialize
- {
- for(counter=0;counter<SGX_ECP256_KEY_SIZE; counter++)
- *(private_public_key_string+counter)=pub_key->gx[counter];
- for(counter=SGX_ECP256_KEY_SIZE;counter<2*SGX_ECP256_KEY_SIZE; counter++)
- *(private_public_key_string+counter)=pub_key->gy[counter-SGX_ECP256_KEY_SIZE];
- }
- if(signing_priv_key != NULL) // private key to serialize
- {
- for(counter=2*SGX_ECP256_KEY_SIZE;counter<3*SGX_ECP256_KEY_SIZE; counter++)
- *(private_public_key_string+counter)=signing_priv_key->r[counter - 2*SGX_ECP256_KEY_SIZE];
- }
- /*
- if(pub_key != NULL) // public key to serialize
- {
- for(counter=SGX_ECP256_KEY_SIZE;counter<2*SGX_ECP256_KEY_SIZE; counter++)
- *(private_public_key_string+counter)=pub_key->gx[counter-SGX_ECP256_KEY_SIZE];
- for(counter=2*SGX_ECP256_KEY_SIZE;counter<3*SGX_ECP256_KEY_SIZE; counter++)
- *(private_public_key_string+counter)=pub_key->gy[counter-2*SGX_ECP256_KEY_SIZE];
- }*/
- }
- }
- // todo: set to private
- void deserialize_string_to_key_pair(uint8_t* private_public_key_string, sgx_ec256_public_t* pub_key, sgx_ec256_private_t* signing_priv_key)
- {
- if(private_public_key_string != NULL) // nowhere to deserialize from
- {
- uint32_t counter;
- if(signing_priv_key != NULL)
- {
- for(counter=2*SGX_ECP256_KEY_SIZE;counter<3*SGX_ECP256_KEY_SIZE; counter++)
- signing_priv_key->r[counter-2*SGX_ECP256_KEY_SIZE]=*(private_public_key_string+counter);
- }
- if(pub_key != NULL)
- {
- for(counter=0;counter<SGX_ECP256_KEY_SIZE; counter++)
- pub_key->gx[counter]=*(private_public_key_string+counter);
- for(counter=SGX_ECP256_KEY_SIZE;counter<2*SGX_ECP256_KEY_SIZE; counter++)
- pub_key->gy[counter-SGX_ECP256_KEY_SIZE]=*(private_public_key_string+counter);
- }
- }
- }
- uint32_t create_and_seal_ecdsa_signing_key_pair(__attribute__((unused)) sgx_ec256_public_t* pub_key, __attribute__((unused)) uint32_t* sealed_data_length, __attribute__((unused)) uint8_t* sealed_data)
- {
- uint32_t ret_status; sgx_ec256_private_t private_key; uint32_t counter;
- ret_status=create_ecdsa_key_pair(pub_key, &private_key);
- if(ret_status!=SGX_SUCCESS)
- return ret_status;
- for(counter=0;counter<SGX_ECP256_KEY_SIZE; counter++)
- signing_priv_key.r[counter]=private_key.r[counter];
- // generating the entire string as there is no SGX function to generate the public key from the private one.
- uint8_t* private_public_key_string = (uint8_t*) malloc(3*SGX_ECP256_KEY_SIZE);
- uint8_t* sealed_data2 = (uint8_t*) malloc(*sealed_data_length);
- // serializing keypair to string
- serialize_key_pair_to_string(pub_key, &private_key, private_public_key_string);
- uint8_t* private_key_string = (uint8_t*) malloc(SGX_ECP256_KEY_SIZE);
- for(counter=0;counter<SGX_ECP256_KEY_SIZE;counter++)
- *(private_key_string+counter)=private_key.r[counter];
- // return *sealed_data_length;
- ret_status = sgx_seal_data(0, NULL, 3*SGX_ECP256_KEY_SIZE, private_public_key_string, *sealed_data_length, (sgx_sealed_data_t*) sealed_data2);
- for(counter=0;counter<*sealed_data_length;counter++)
- *(sealed_data+counter)=*(sealed_data2+counter);
- free(sealed_data2);
- free(private_key_string); //free(private_key);
- free(private_public_key_string);
- return ret_status; // SGX_SUCCESS;
- }
- /*
- uint32_t unseal_and_restore_sealed_signing_key_pair(__attribute__((unused)) sgx_ec256_public_t* pub_key, __attribute__((unused)) uint8_t* sealed_data, __attribute__((unused)) uint32_t* sgx_sealed_data_length)
- {
- return SGX_SUCCESS;
- }*/
- uint32_t unseal_and_restore_sealed_signing_key_pair(__attribute__((unused)) sgx_ec256_public_t* pub_key, uint8_t* sealed_data, size_t* sgx_sealed_data_length)
- {
- uint32_t expected_plaintext_msg_length; uint8_t* temp_plaintext; uint32_t counter; uint32_t ret_status;
- expected_plaintext_msg_length = sgx_get_encrypt_txt_len((sgx_sealed_data_t*)sealed_data);
- if(expected_plaintext_msg_length == 0xffffffff)
- return 0xFFFFFFFF;
- // uint32_t return_status;
- uint8_t* sealed_data2 = (uint8_t*) malloc(*sgx_sealed_data_length);
- for(counter=0;counter<*sgx_sealed_data_length;counter++)
- {
- *(sealed_data2+counter)=*(sealed_data+counter);
- }
- temp_plaintext = (uint8_t*)malloc( expected_plaintext_msg_length );
- ret_status = sgx_unseal_data((sgx_sealed_data_t*)sealed_data2, NULL, 0, temp_plaintext, &expected_plaintext_msg_length);
- if(ret_status != SGX_SUCCESS)
- {
- free(temp_plaintext);free(sealed_data2);
- switch(ret_status)
- {
- case SGX_ERROR_MAC_MISMATCH:
- // MAC of the sealed data is incorrect. The sealed data has been tampered.
- break;
- case SGX_ERROR_INVALID_ATTRIBUTE:
- // Indicates attribute field of the sealed data is incorrect.
- break;
- case SGX_ERROR_INVALID_ISVSVN:
- // Indicates isv_svn field of the sealed data is greater than the enclave�s ISVSVN. This is a downgraded enclave.
- break;
- case SGX_ERROR_INVALID_CPUSVN:
- // Indicates cpu_svn field of the sealed data is greater than the platform�s cpu_svn. enclave is on a downgraded platform.
- break;
- case SGX_ERROR_INVALID_KEYNAME:
- // Indicates key_name field of the sealed data is incorrect.
- break;
- default:
- // other errors
- break;
- }
- return ret_status;
- }
-
- deserialize_string_to_key_pair(temp_plaintext, pub_key, &signing_priv_key);
- free(temp_plaintext); free(sealed_data2);
- return SGX_SUCCESS;
- }
- uint32_t create_and_sign_client_side_pub_key(sgx_measurement_t* mr_enclave, sgx_ec256_public_t* generated_pub_key, sgx_ec256_signature_t* generated_signature)
- {
- // create key pair
- uint32_t ret_status = create_ecdsa_key_pair(&short_term_pub_key, &short_term_priv_key); uint32_t counter;
- uint32_t ret_status2;
- if(ret_status!=SGX_SUCCESS)
- return ret_status;
- // serialize public key, append mr_enclave
- uint8_t* public_key_string = (uint8_t*) malloc(3*SGX_ECP256_KEY_SIZE); // for .edl file - size parameter for serialize is 96 and this fits coz we need to append the mr_enclave to the pub key
- serialize_key_pair_to_string(&short_term_pub_key, NULL, public_key_string);
- for(counter=32*2; counter<32*3; counter++) // appending mr_enclave
- *(public_key_string+counter)=mr_enclave->m[counter];
- // retrieve long-term private key from global variable - apparently, need to create a local copy or it crashes
- sgx_ec256_private_t long_term_priv_key;
- for(counter=0; counter<SGX_ECP256_KEY_SIZE; counter++)
- long_term_priv_key.r[counter] = signing_priv_key.r[counter];
- // sign public key with long-term private key
- sgx_ec256_signature_t local_signature; sgx_ecc_state_handle_t ecc_handle;
- //// opening context for signature
- ret_status = sgx_ecc256_open_context(&ecc_handle);
- if(ret_status != SGX_SUCCESS)
- return ret_status;
- ret_status = sgx_ecdsa_sign(public_key_string,2*SGX_ECP256_KEY_SIZE, &long_term_priv_key, &local_signature, ecc_handle);
- ret_status2 = sgx_ecc256_close_context(ecc_handle);
- free(public_key_string);
- if(ret_status == SGX_SUCCESS)
- {
- for(counter=0; counter<SGX_ECP256_KEY_SIZE; counter++)
- generated_pub_key->gx[counter] = short_term_pub_key.gx[counter];
- for(counter=0;counter<SGX_NISTP_ECP256_KEY_SIZE ; counter++)
- {
- generated_signature->x[counter] = local_signature.x[counter];
- generated_signature->y[counter] = local_signature.y[counter];
- }
- }
- if(ret_status != SGX_SUCCESS || ret_status2 != SGX_SUCCESS)
- return 0xFFFFFFFF;
- return 0;
- }
- uint32_t calculate_sealed_data_size( uint32_t input_size)
- {
- // *op_size=sgx_calc_sealed_data_size(0, input_size);
- return sgx_calc_sealed_data_size(0, input_size);
- }
- // TODO: Fix this.
- //Respond to the request from the Source Enclave to close the session
- ATTESTATION_STATUS end_session(/**/)
- {
- return SUCCESS;
- }
- /*
- // Session_id is set to the first index of the pointer array that is non-null.(Not sure how it is ensured that all of them point to NULL at the start)
- // Why can't it just keep a counter that is incremented? What are the values of g_session_id_tracker array?
- //Returns a new sessionID for the source destination session
- ATTESTATION_STATUS generate_session_id(uint32_t *session_id)
- {
- ATTESTATION_STATUS status = SUCCESS;
- if(!session_id)
- {
- return INVALID_PARAMETER_ERROR;
- }
- //if the session structure is untintialized, set that as the next session ID
- for (int i = 0; i < MAX_SESSION_COUNT; i++)
- {
- if (g_session_id_tracker[i] == NULL)
- {
- *session_id = i;
- return status;
- }
- }
- status = NO_AVAILABLE_SESSION_ERROR;
- return status;
- */
- // *session_id=++global_session_id;
- //}
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