Decryptor/App/systemLA.cpp

// 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 "sgx_tcrypto.h"
#include <iostream>
#include "Openssl_crypto.h"

// TODO: Make these private functions
int apache_fd;
int decrypt_client_data_wrapper(unsigned char* op_plaintext , uint32_t own_enclave_id);


int 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;
}

// TODO: private functions
int 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 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;
}

int local_attestation_initiator(int port, uint32_t own_enclave_id)
{
  // declare msg1, msg2, msg3 protobuf objects
  protobuf_sgx_dh_msg1_t protobuf_msg1;
  protobuf_sgx_dh_msg2_t protobuf_msg2;
  protobuf_sgx_dh_msg3_t protobuf_msg3;
  protobuf_post_LA_encrypted_msg_t protobuf_encrypted_msg;
  uint32_t protobuf_sgx_ret; uint32_t sgx_ret;

  // For socket to listen to the Apache enclave.
  int server_fd=0; int accept_fd = 0;
  struct sockaddr_in own_addr;
  struct sockaddr_storage apache_addr; socklen_t apache_addr_size = sizeof(apache_addr);
  uint32_t session_id;  uint8_t read_or_write;
  size_t bytes_read_post_la; uint8_t encrypted_apache_mrsigner_and_tag[48];
  size_t bytes_written_post_la;
  //  int counter;
  server_fd=set_up_socket(port, &own_addr);
  if(server_fd==-1)
      return -1;
  printf("Successfully set up a socket to communicate with the Apache enclave.\n");
  fflush(stdout);

  protobuf_sgx_ret = generate_protobuf_dh_msg1(own_enclave_id, protobuf_msg1, &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;
  }


  accept_fd = accept(server_fd, (struct sockaddr *)&apache_addr,&apache_addr_size);
  if (accept_fd <0)
  {
        printf("Error in accepting %d", errno);
        return -1;
  }
  printf("Accepted fd\n"); fflush(stdout);

  if(write_protobuf_msg_to_fd(accept_fd, protobuf_msg1)!=0)
    return -1;

  if(read_protobuf_msg_from_fd(accept_fd, protobuf_msg2)!=0)
    return -1;

  protobuf_sgx_ret = process_protobuf_dh_msg2_generate_protobuf_dh_msg3(own_enclave_id, protobuf_msg2, protobuf_msg3, &session_id, &read_or_write);
  if(protobuf_sgx_ret != 0)
  {
      printf("Error in generate_protobuf_dh_msg2: 0x%x", protobuf_sgx_ret); fflush(stdout); return protobuf_sgx_ret;
  }

  if(write_protobuf_msg_to_fd(accept_fd, protobuf_msg3)!=0)
    return -1;
//  read_or_write=0;

  printf("Here\n"); fflush(stdout);
  if(read_or_write)
  {
  	bytes_read_post_la=read(accept_fd, encrypted_apache_mrsigner_and_tag, 32);
	  if(bytes_read_post_la!=32)
 	 {
       	printf("Not all of the encrypted apache's mrsigner was read from the verifier.\n"); fflush(stdout); return 0xfe;
 	 }
	  bytes_read_post_la=read(accept_fd, encrypted_apache_mrsigner_and_tag+32, 16);
	  if(bytes_read_post_la!=16)
	  {
       printf("Not all of the encrypted apache's mrsigner **tag** was read from the verifier.\n"); fflush(stdout); return 0xfe;
  	}
  	uint32_t count;
  	for(count=0;count<48;count++)
		printf("0x%02x ", encrypted_apache_mrsigner_and_tag[count]);
  	printf("\n");fflush(stdout);
//  sgx_ret=decrypt_wrapper(own_enclave_id, encrypted_apache_mrsigner_and_tag, 32, encrypted_apache_mrsigner_and_tag+32 , plaintext);
Decryptor_decrypt_verifiers_message_set_apache_mrsigner(own_enclave_id, &sgx_ret, encrypted_apache_mrsigner_and_tag, encrypted_apache_mrsigner_and_tag+32);
 	 if(sgx_ret!=0)
	  {
	printf("Error in decryption: 0x%x\n", sgx_ret); fflush(stdout); return sgx_ret;
	  }
	  printf("Successful decryption\n"); fflush(stdout);


  }
  else
  {

	apache_fd=accept_fd;
	uint8_t encrypted_sign_data_and_sign_and_tag[176];
	memset(encrypted_sign_data_and_sign_and_tag,0x0,176);
	uint8_t plaintext_sign_data_and_sign[160];
	uint8_t plaintext_priv_key[32];
	sgx_ec256_signature_t sig2;
	Decryptor_create_and_encrypt_mitigator_header_value(own_enclave_id, &sgx_ret, plaintext_sign_data_and_sign, encrypted_sign_data_and_sign_and_tag , encrypted_sign_data_and_sign_and_tag+160, plaintext_priv_key,&sig2);
	if(sgx_ret!=0)
	{
		printf("Error in generating encrypted mitigator header:0x%x\n", sgx_ret); fflush(stdout); return 0xf3;
	}
	uint32_t count;
	for(count=0;count<160;count++)
	{
		printf("0x%02x ", encrypted_sign_data_and_sign_and_tag[count]);
	}
	printf("\n"); fflush(stdout);
	printf("Plaintext Signature data:\n"); fflush(stdout);
        for(count=0;count<96;count++)
        {
                printf("0x%02x ", plaintext_sign_data_and_sign[count]);

        }
	printf("\n"); fflush(stdout);

	printf("Plaintext signature: \n"); fflush(stdout);
        for(count=0;count<32;count++)
        {
                printf("%02x", plaintext_sign_data_and_sign[count+96]);
        }
	printf("\n"); fflush(stdout);
        for(count=32;count<64;count++)
        {
                printf("%02x", plaintext_sign_data_and_sign[count+96]);

        }

        printf("\n"); fflush(stdout);
	printf("Heres the private key used to sign this \n"); // TODO: Remove this printf and the private key parts to the ecall
	for(count=0;count<32;count++)
		printf("%02x", plaintext_priv_key[31-count]);
        printf("\n"); fflush(stdout);
	for(count=0;count<8;count++)
	{
		printf("%02x ", sig2.x[count]);
	}
	printf("\n"); fflush(stdout);

        for(count=0;count<8;count++)
        {
                printf("%02x ", sig2.y[count]);
        }
        printf("\n"); fflush(stdout);

	protobuf_encrypted_msg.set_msg((void*)encrypted_sign_data_and_sign_and_tag, 176);
	if(write_protobuf_msg_to_fd(apache_fd, protobuf_encrypted_msg) != 0)
         {
        printf("Not all of the decryptor's signature was written to the Apache.\n"); fflush(stdout); return 0xfe;
         }
	unsigned char op_plaintext[160];
	do {
//	sleep(100);
	decrypt_client_data_wrapper(op_plaintext, own_enclave_id);
//	sleep(100);
	} while(true);


  }

        printf("Successfully done Local attestation\n");
        fflush(stdout);
        return 0;

}


// decrypt_client_data function that does a read-then-write loop
// say msg length amount of bytes are read
////// TODO: first need to decrypt all data received with the aes-gcm apache_iv
////// Decryptor.cpp function gets the first 64 bytes as first arg and the rest of ciphertext as 2nd arg.
// then need to call the sgx's compute_shared_key fn for ECDH key - on first 64 bytes.
// print this key
// call sha256 on it
// TODO: decrypt rest of msglength - 64 bytes using this key. (set IV in crypto function)
////// TODO: then encrypt all user data with apache's key
////// return here
/// write data.
int decrypt_client_data_wrapper(unsigned char* op_plaintext , uint32_t own_enclave_id)
{
  protobuf_post_LA_encrypted_msg_t protobuf_msg_from_apache;
  unsigned char* msg_from_apache;
  unsigned int protobuf_msg_from_apache_length;
  uint32_t sgx_ret_status;
  unsigned char client_keys_and_data_encrypted_to_enclave[160+64];
  unsigned int client_data_encrypted_to_enclave_length;
	unsigned char client_data_encrypted_to_apache[160+64];
  unsigned int client_data_encrypted_to_apache_length;

  printf("Reading msg from apache"); fflush(stdout);
  if(read_protobuf_msg_from_fd(apache_fd, protobuf_msg_from_apache)!=0)
  {
    printf("Not all of the Apache's message was read\n"); fflush(stdout); return 0xfe;
  }
  protobuf_msg_from_apache_length = protobuf_msg_from_apache.msg().length();
  msg_from_apache = (unsigned char*) protobuf_msg_from_apache.msg().c_str();

  std::string protobuf_encrypted_msg_string(protobuf_msg_from_apache.msg());
	int counter;

  memset(client_keys_and_data_encrypted_to_enclave, 0, 160+64);
  for(counter=0;counter<protobuf_msg_from_apache_length;counter++)
  {
  	client_keys_and_data_encrypted_to_enclave[counter]=*(msg_from_apache+counter);
		printf("%d ",msg_from_apache[counter]);
  }
	printf("\n"); fflush(stdout);

	client_data_encrypted_to_enclave_length = protobuf_msg_from_apache_length-64; // TODO: we hope it's greater than 0
  // Just so that the ciphertext is returned back to Apache in case decrypt_client_data fails.
	for(counter=0;counter<client_data_encrypted_to_enclave_length;counter++)
		client_data_encrypted_to_apache[counter]=client_keys_and_data_encrypted_to_enclave[counter+64];

  printf("Key in big endian form:\n"); fflush(stdout);
  for(counter=0; counter<64; counter++)
    printf("0x%02x ", *(client_keys_and_data_encrypted_to_enclave + counter));
  printf("\n"); fflush(stdout);

	client_data_encrypted_to_apache_length = client_data_encrypted_to_enclave_length;
	uint8_t clen; 
	Decryptor_decrypt_client_data(own_enclave_id, &sgx_ret_status, client_keys_and_data_encrypted_to_enclave, client_data_encrypted_to_enclave_length, client_data_encrypted_to_apache, &clen);
	if(sgx_ret_status != 0)
	{
		printf("decrypt_client_data returned :0x%x\n", sgx_ret_status); fflush(stdout); //return sgx_ret_status;
	}
	if(clen != 0)
		client_data_encrypted_to_apache_length = clen; 

	printf("About to write the following bytes to the apache\n"); fflush(stdout);
	for(counter=0;counter<client_data_encrypted_to_apache_length;counter++)
		printf("%d,", client_data_encrypted_to_apache[counter]);
	printf("\n"); fflush(stdout);
  protobuf_msg_from_apache.set_msg((void*)  client_data_encrypted_to_apache, client_data_encrypted_to_apache_length);// Is this message set tho?
	if(write_protobuf_msg_to_fd(apache_fd, protobuf_msg_from_apache)!=0)
	{
		printf("Not all of the protobuf message was written to Apache.\n"); fflush(stdout); return 0xfe;
	}
	printf("Wrote data to Apache of length %d \n", protobuf_msg_from_apache.ByteSize());fflush(stdout);
	return 0;
}