Systemsicherheit/Assignment 7 - SGX Hands-on/SGX101_sample_code-master/ProcessLocalAttestation/Enclave2/Untrusted_LocalAttestation/UntrustedEnclaveMessageExchange.cpp

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/*
* Copyright (C) 2011-2018 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_eid.h"
#include "error_codes.h"
#include "datatypes.h"
#include "sgx_urts.h"
#include "UntrustedEnclaveMessageExchange.h"
#include "sgx_dh.h"
#include <map>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
std::map<sgx_enclave_id_t, uint32_t>g_enclave_id_map;
extern sgx_enclave_id_t e1_enclave_id;
//Makes an sgx_ecall to the destination enclave to get session id and message1
ATTESTATION_STATUS session_request_ocall(sgx_enclave_id_t src_enclave_id, sgx_enclave_id_t dest_enclave_id, sgx_dh_msg1_t* dh_msg1, uint32_t* session_id)
{
uint32_t status = 0;
sgx_status_t ret = SGX_SUCCESS;
// printf("[OCALL IPC] Generating msg1 and session_id for Enclave1\n");
// for session_id
printf("[OCALL IPC] Passing SessionID to shared memory for Enclave1\n");
key_t key_session_id = ftok("../..", 3);
int shmid_session_id = shmget(key_session_id, sizeof(uint32_t), 0666|IPC_CREAT);
uint32_t* tmp_session_id = (uint32_t*)shmat(shmid_session_id, (void*)0, 0);
memcpy(tmp_session_id, session_id, sizeof(uint32_t));
// for msg1
printf("[OCALL IPC] Passing message1 to shared memory for Enclave1\n");
key_t key_msg1 = ftok("../..", 2);
int shmid_msg1 = shmget(key_msg1, sizeof(sgx_dh_msg1_t), 0666|IPC_CREAT);
sgx_dh_msg1_t* tmp_msg1 = (sgx_dh_msg1_t *)shmat(shmid_msg1, (void*)0, 0);
memcpy(tmp_msg1, dh_msg1, sizeof(sgx_dh_msg1_t));
shmdt(tmp_msg1);
shmdt(tmp_session_id);
// let enclave1 to receive msg1
printf("[OCALL IPC] Waiting for Enclave1 to process SessionID and message1...\n");
sleep(5);
if (ret == SGX_SUCCESS)
return (ATTESTATION_STATUS)status;
else
return INVALID_SESSION;
}
//Makes an sgx_ecall to the destination enclave sends message2 from the source enclave and gets message 3 from the destination enclave
ATTESTATION_STATUS exchange_report_ocall(sgx_enclave_id_t src_enclave_id, sgx_enclave_id_t dest_enclave_id, sgx_dh_msg2_t *dh_msg2, sgx_dh_msg3_t *dh_msg3, uint32_t session_id)
{
uint32_t status = 0;
sgx_status_t ret = SGX_SUCCESS;
if (dh_msg3 == NULL)
{
// get msg2 from Enclave1
printf("[OCALL IPC] Message2 should be ready\n");
printf("[OCALL IPC] Retrieving message2 from shared memory\n");
key_t key_msg2 = ftok("../..", 4);
int shmid_msg2 = shmget(key_msg2, sizeof(sgx_dh_msg2_t), 0666|IPC_CREAT);
sgx_dh_msg2_t* tmp_msg2 = (sgx_dh_msg2_t *)shmat(shmid_msg2, (void*)0, 0);
memcpy(dh_msg2, tmp_msg2, sizeof(sgx_dh_msg2_t));
shmdt(tmp_msg2);
}
// ret = Enclave1_exchange_report(src_enclave_id, &status, 0, dh_msg2, dh_msg3, session_id);
else
{
// pass msg3 to shm for Enclave
printf("[OCALL IPC] Passing message3 to shared memory for Enclave1\n");
key_t key_msg3 = ftok("../..", 5);
int shmid_msg3 = shmget(key_msg3, sizeof(sgx_dh_msg3_t), 0666|IPC_CREAT);
sgx_dh_msg3_t* tmp_msg3 = (sgx_dh_msg3_t *)shmat(shmid_msg3, (void*)0, 0);
memcpy(tmp_msg3, dh_msg3, sizeof(sgx_dh_msg3_t));
shmdt(tmp_msg3);
// wait for Enclave1 to process msg3
printf("[OCALL IPC] Waiting for Enclave1 to process message3...\n");
sleep(5);
}
if (ret == SGX_SUCCESS)
return (ATTESTATION_STATUS)status;
else
return INVALID_SESSION;
}
//Make an sgx_ecall to the destination enclave function that generates the actual response
ATTESTATION_STATUS send_request_ocall(sgx_enclave_id_t src_enclave_id, sgx_enclave_id_t dest_enclave_id,secure_message_t* req_message, size_t req_message_size, size_t max_payload_size, secure_message_t* resp_message, size_t resp_message_size)
{
uint32_t status = 0;
sgx_status_t ret = SGX_SUCCESS;
uint32_t temp_enclave_no;
std::map<sgx_enclave_id_t, uint32_t>::iterator it = g_enclave_id_map.find(dest_enclave_id);
if(it != g_enclave_id_map.end())
{
temp_enclave_no = it->second;
}
else
{
return INVALID_SESSION;
}
switch(temp_enclave_no)
{
case 1:
ret = Enclave1_generate_response(dest_enclave_id, &status, src_enclave_id, req_message, req_message_size, max_payload_size, resp_message, resp_message_size);
break;
case 2:
ret = Enclave2_generate_response(dest_enclave_id, &status, src_enclave_id, req_message, req_message_size, max_payload_size, resp_message, resp_message_size);
break;
case 3:
ret = Enclave3_generate_response(dest_enclave_id, &status, src_enclave_id, req_message, req_message_size, max_payload_size, resp_message, resp_message_size);
break;
}
if (ret == SGX_SUCCESS)
return (ATTESTATION_STATUS)status;
else
return INVALID_SESSION;
}
//Make an sgx_ecall to the destination enclave to close the session
ATTESTATION_STATUS end_session_ocall(sgx_enclave_id_t src_enclave_id, sgx_enclave_id_t dest_enclave_id)
{
uint32_t status = 0;
sgx_status_t ret = SGX_SUCCESS;
uint32_t temp_enclave_no;
std::map<sgx_enclave_id_t, uint32_t>::iterator it = g_enclave_id_map.find(dest_enclave_id);
if(it != g_enclave_id_map.end())
{
temp_enclave_no = it->second;
}
else
{
return INVALID_SESSION;
}
switch(temp_enclave_no)
{
case 1:
ret = Enclave1_end_session(dest_enclave_id, &status, src_enclave_id);
break;
case 2:
ret = Enclave2_end_session(dest_enclave_id, &status, src_enclave_id);
break;
case 3:
ret = Enclave3_end_session(dest_enclave_id, &status, src_enclave_id);
break;
}
if (ret == SGX_SUCCESS)
return (ATTESTATION_STATUS)status;
else
return INVALID_SESSION;
}
void ocall_print_string(const char *str)
{
printf("%s", str);
}