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- // Knows only protobuf_sgx objects, protobuf header.
- // For socket programming
- #include <sys/socket.h>
- #include <stdlib.h>
- #include <netinet/in.h>
- #include <string.h>
- #include <errno.h>
- #include <unistd.h>
- #include <stdio.h>
- #include "ProtobufLAMessages.pb.h"
- #include <google/protobuf/io/coded_stream.h>
- #include <google/protobuf/io/zero_copy_stream_impl.h>
- using namespace google::protobuf::io;
- #include "protobufLAInitiator.h"
- #include "../Decryptor/Decryptor_u.h"
- #include <iostream>
- #include "LocalAttestationUntrusted.h"
- #include<sys/time.h>
- #include <fcntl.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- uint32_t LocalAttestationUntrusted::session_id=0;
- protobuf_sgx_dh_msg1_t LocalAttestationUntrusted::protobuf_msg1;
- uint8_t* LocalAttestationUntrusted::output_ciphertext_plus_tag=NULL;
- int LocalAttestationUntrusted::read_protobuf_msg_from_fd(int accept_fd, google::protobuf::MessageLite& message)
- {
- ZeroCopyInputStream* raw_input;
- CodedInputStream* coded_input;
- uint32_t size;
- CodedInputStream::Limit limit;
- raw_input = new FileInputStream(accept_fd);
- coded_input = new CodedInputStream(raw_input);
- if(!coded_input->ReadVarint32(&size))
- {
- printf("Error in reading size of msg");
- fflush(stdout);
- return -1;
- }
- //printf("size of msg was read to be %" PRIu32 " \n", size);
- fflush(stdout);
- limit = coded_input->PushLimit(size);
- if(!message.ParseFromCodedStream(coded_input))
- {
- printf("Error in parsing msg");
- fflush(stdout);
- return -1;
- }
- coded_input->PopLimit(limit);
- delete raw_input;
- delete coded_input;
- return 0;
- }
- int LocalAttestationUntrusted::write_protobuf_msg_to_fd(int accept_fd, google::protobuf::MessageLite& message)
- {
- ZeroCopyOutputStream* raw_output = new FileOutputStream(accept_fd);
- CodedOutputStream* coded_output = new CodedOutputStream(raw_output);
- coded_output->WriteVarint32(message.ByteSize());
- if(!message.SerializeToCodedStream(coded_output))
- {
- printf("SerializeToCodedStream failed");
- fflush(stdout);
- return -1;
- }
- // As per this - https://stackoverflow.com/questions/22881876/protocol-buffers-how-to-serialize-and-deserialize-multiple-messages-into-a-file?noredirect=1&lq=1
- // TODO: There may be a better way to do this - 1) this happens with every accept now and 2) make it happen on the stack vs heap - destructor will be called on return from this function (main) and the items will then be written out. (We probably don't want that, actually)
- delete coded_output;
- delete raw_output;
- fflush(stdout);
- return 0;
- }
- // Sets up a socket to bind and listen to the given port. Returns FD of the socket on success, -1 on failure (and prints a msg to stdout with the errno)
- int LocalAttestationUntrusted::set_up_socket(int port, sockaddr_in* address)
- {
- int server_fd = 0;
- // Creating socket file descriptor for listening for attestation requests.
- server_fd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);
- if (server_fd == -1)
- {
- printf("Error in creating a socket - %d", errno);
- return -1;
- }
- // Preparing the address struct for binding
- address->sin_family = AF_INET;
- address->sin_addr.s_addr = INADDR_ANY; // Todo: should this be localhost?
- address->sin_port = htons(port);
- // memset(address->sin_zero,0,sizeof(address->sin_zero));
- socklen_t addrlen = sizeof(*address);
- // Binding
- if (bind(server_fd, (sockaddr*)address, addrlen)<0)
- {
- printf("Error in binding %d - port was %d - ", errno, port);
- return -1;
- }
- // Listening
- if (listen(server_fd, 128) < 0)
- {
- printf("Error in listening %d", errno);
- return -1;
- }
- return server_fd;
- }
- uint32_t LocalAttestationUntrusted::local_attestation_msg2_msg3(uint32_t own_enclave_id, int accept_fd)
- {
- uint32_t protobuf_sgx_ret;
- protobuf_sgx_dh_msg2_t protobuf_msg2;
- protobuf_sgx_dh_msg3_t protobuf_msg3;
- printf("Writing message 1\n"); fflush(stdout);
- if(write_protobuf_msg_to_fd(accept_fd, protobuf_msg1)!=0)
- return 0x1;
- printf("Reading message 2\n"); fflush(stdout);
- if(read_protobuf_msg_from_fd(accept_fd, protobuf_msg2)!=0)
- return 0x2;
- protobuf_sgx_ret = process_protobuf_dh_msg2_generate_protobuf_dh_msg3(own_enclave_id, protobuf_msg2, protobuf_msg3, &LocalAttestationUntrusted::session_id);
- if(protobuf_sgx_ret != 0)
- {
- printf("Error in generate_protobuf_dh_msg2: 0x%x", protobuf_sgx_ret); fflush(stdout); return protobuf_sgx_ret;
- }
- printf("Writing message 3\n"); fflush(stdout);
- if(write_protobuf_msg_to_fd(accept_fd, protobuf_msg3)!=0)
- return 0x3;
- return 0;
- }
- int LocalAttestationUntrusted::decrypt_client_data(uint32_t own_enclave_id, int fd, uint8_t* output_ciphertext_plus_tag, uint8_t* input_ciphertext_plus_tag, int time_file_fd)
- {
- protobuf_post_LA_encrypted_msg_t protobuf_msg;
- protobuf_post_LA_encrypted_msg_t protobuf_msg_response;
- unsigned char* protobuf_msg_ptr;
- uint32_t sgx_ret_status=0;
- uint32_t input_ciphertext_plus_tag_length;
- uint32_t output_ciphertext_plus_tag_length;
- struct timeval tv1, tv2;
- char time_buf[60] = {0};
- size_t bytes_written;
- unsigned long int new_time, old_time;
- uint32_t count;
- if(read_protobuf_msg_from_fd(fd, protobuf_msg)!=0)
- return 0xfe;
- gettimeofday(&tv1, NULL);
- input_ciphertext_plus_tag_length = protobuf_msg.msg().length();
- protobuf_msg_ptr = (uint8_t*) protobuf_msg.msg().c_str();
- // Just so that the ciphertext - client data - is returned back to Apache in case this function fails.
- // client data is after public key (64 bytes)
- protobuf_msg_response.set_msg((void*) protobuf_msg_ptr + 64, input_ciphertext_plus_tag_length - 64);
-
- for(count=0;count<input_ciphertext_plus_tag_length;count++)
- {
- input_ciphertext_plus_tag[count]=protobuf_msg_ptr[count];
- }
- // We assume that the output is not changed unless it is successful throughout.
- Decryptor_process_apache_message_generate_response_wrapper(own_enclave_id, &sgx_ret_status, input_ciphertext_plus_tag, input_ciphertext_plus_tag_length, output_ciphertext_plus_tag, &output_ciphertext_plus_tag_length);
- if(sgx_ret_status==0)
- {
- protobuf_msg_response.set_msg((void*) output_ciphertext_plus_tag, output_ciphertext_plus_tag_length);
- }
- else
- {
- printf("\n Error in decryptors call to the process_apache wrapper : 0x%02x\n", sgx_ret_status);
- for(count=0;count<output_ciphertext_plus_tag_length;count++)
- printf("0x%02x ", output_ciphertext_plus_tag[count]);
- printf("\n"); fflush(stdout);
- }
- if(write_protobuf_msg_to_fd(fd, protobuf_msg_response)!=0)
- return 0xfc;
- gettimeofday(&tv2, NULL);
- new_time=tv2.tv_usec + tv2.tv_sec * 1000000;
- old_time=tv1.tv_usec + tv1.tv_sec * 1000000;
- bytes_written=sprintf(time_buf, "%lu %lu\n", old_time, new_time);
- write(time_file_fd, time_buf, bytes_written);
- return 0;
- }
-
- int LocalAttestationUntrusted::prepare_local_attestation_as_responder_msg1(uint32_t own_enclave_id) //, int port)
- {
- uint32_t protobuf_sgx_ret;
- protobuf_sgx_ret = generate_protobuf_dh_msg1(own_enclave_id, protobuf_msg1, &LocalAttestationUntrusted::session_id);
- if(protobuf_sgx_ret != 0)
- {
- printf("Error in generate_protobuf_dh_msg1: 0x%x", protobuf_sgx_ret); fflush(stdout); return protobuf_sgx_ret;
- }
- return 0;
- }
- int LocalAttestationUntrusted::setup_socket_for_local_attestation_requests(int port)
- {
- struct sockaddr_in own_addr;
- return set_up_socket(port, &own_addr);
- }
- // TODO: CHANGED SIGNATURE.
- int LocalAttestationUntrusted::local_attestation_as_responder_msg2_msg3(uint32_t own_enclave_id, int server_fd, int* accept_fd)
- {
- uint32_t protobuf_sgx_ret;
- struct sockaddr_storage apache_addr;
- socklen_t apache_addr_size = sizeof(apache_addr);
- int temp_accept_fd;
- temp_accept_fd = accept(server_fd, (struct sockaddr *)&apache_addr,&apache_addr_size);
- if (temp_accept_fd <0)
- {
- printf("Error in accepting %d", errno); fflush(stdout);
- return temp_accept_fd;
- }
- *accept_fd=temp_accept_fd;
- protobuf_sgx_ret = local_attestation_msg2_msg3(own_enclave_id, temp_accept_fd);
- return protobuf_sgx_ret;
- }
- int LocalAttestationUntrusted::post_local_attestation_with_verifier(uint32_t own_enclave_id, int accept_fd)
- {
- uint32_t protobuf_sgx_ret;
- uint8_t encrypted_apache_mrsigner_and_tag[150];
- size_t bytes_read;
- int count;
- printf("Here\n"); fflush(stdout);
- bytes_read=read(accept_fd, encrypted_apache_mrsigner_and_tag, 60);
- if(bytes_read!=60)
- {
- printf("Not all of the encrypted apache's mrsigner was read from the verifier.\n"); fflush(stdout);
- close(accept_fd);
- return 0xfe;
- }
- for(count=0;count<60;count++)
- printf("0x%02x ", encrypted_apache_mrsigner_and_tag[count]);
- printf("\n");fflush(stdout);
- Decryptor_process_verifiers_message_wrapper(own_enclave_id, &protobuf_sgx_ret, encrypted_apache_mrsigner_and_tag, 60);
- if(protobuf_sgx_ret!=0)
- {
- printf("Error in decryption: 0x%x\n", protobuf_sgx_ret); fflush(stdout);
- close(accept_fd);
- return protobuf_sgx_ret;
- }
- printf("Successful decryption\n"); fflush(stdout);
- close(accept_fd);
- uint8_t output[64];
- Decryptor_get_verifier_mrenclave_apache_mrsigner_wrapper(own_enclave_id, output);
- uint32_t counter;
- for(counter=0; counter<32; counter++)
- printf("0x%x ", output[counter]);
- printf("/n");
- for(counter=32; counter<64; counter++)
- printf("0x%x ", output[counter]);
- printf("/n");
- fflush(stdout);
- return 0;
- }
- int LocalAttestationUntrusted::post_local_attestation_with_apache(uint32_t own_enclave_id, int accept_fd)
- {
- protobuf_post_LA_encrypted_msg_t protobuf_encrypted_msg;
- uint8_t encrypted_sign_data_and_sign_and_tag[200]; // 176+12 for IV = 188
- uint32_t op_length;
- memset(encrypted_sign_data_and_sign_and_tag,0x0,200);
- uint32_t internal_return_status;
- uint32_t count;
- uint32_t sgx_ret;
- Decryptor_create_and_encrypt_mitigator_header_H_wrapper(own_enclave_id, &sgx_ret, encrypted_sign_data_and_sign_and_tag, &op_length);
- if(sgx_ret!=0)
- {
- printf("Error in generating encrypted mitigator header:0x%x\n", sgx_ret); fflush(stdout);
- close(accept_fd);
- return 0xf3;
- }
- for(count=0;count<op_length;count++)
- {
- printf("0x%02x ", encrypted_sign_data_and_sign_and_tag[count]);
- }
- printf("\n"); fflush(stdout);
- protobuf_encrypted_msg.set_msg((void*)encrypted_sign_data_and_sign_and_tag, op_length);
- if(write_protobuf_msg_to_fd(accept_fd, protobuf_encrypted_msg) != 0)
- {
- printf("Not all of the mitigator token H was written to the Apache.\n"); fflush(stdout);
- close(accept_fd);
- return 0xfe;
- }
- uint8_t public_key[64];
- Decryptor_get_short_term_public_key_wrapper(own_enclave_id, public_key);
- for(count=0;count<64;count++)
- printf("%02x ",public_key[count]);
- printf("\n"); fflush(stdout);
-
- uint8_t* output_ciphertext_plus_tag = (uint8_t*) malloc(4100); // 12 bytes for ciphertext iv + 16 bytes for ciphertext tag = 28 byte
- uint8_t* input_ciphertext_plus_tag = (uint8_t*) malloc(4100);
- int time_file_fd=open("decryptor_time.txt", O_APPEND | O_WRONLY);
- do {
- internal_return_status = decrypt_client_data(own_enclave_id, accept_fd, output_ciphertext_plus_tag, input_ciphertext_plus_tag, time_file_fd);
- } while(internal_return_status==0);
- close(accept_fd);
- free(output_ciphertext_plus_tag);
- free(input_ciphertext_plus_tag);
- return internal_return_status;
- }
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