linux-sgx-trts-modified/psw/ae/aesm_service/source/network/network_encoding_wrapper.cpp

/*
 * 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 "network_encoding_wrapper.h"
#include "oal/oal.h"
#include "aesm_encode.h"

ae_error_t AESMNetworkEncoding::aesm_send_recv_msg(const char *url, const uint8_t * msg, uint32_t msg_size, uint8_t* &resp_msg, uint32_t& resp_size, http_methods_t type, bool is_ocsp)
{
    return ::aesm_network_send_receive(url, msg, msg_size, &resp_msg, &resp_size, type, is_ocsp);
}

ae_error_t AESMNetworkEncoding::aesm_send_recv_msg_encoding_internal(const char *url, const uint8_t * msg, uint32_t msg_size, uint8_t* &resp, uint32_t& resp_size)
{
    resp = NULL;
    resp_size = 0;

    ae_error_t ae_ret = AE_SUCCESS;
    uint8_t *encode_msg = NULL;
    uint32_t encoding_size = get_request_encoding_length(msg);
    uint8_t *recv_msg = NULL;
    uint32_t decode_buffer_size = 0;
    uint32_t recv_size = 0;
    if(encoding_size == 0){
        AESM_DBG_WARN("invalid msg_size 0 to send to url:%s", url);
        ae_ret = AE_FAILURE;
        goto ret_point;
    }
    encode_msg = reinterpret_cast<uint8_t *>(malloc(encoding_size));
    if(encode_msg == NULL){
        AESM_DBG_ERROR("malloc failed");
        ae_ret = AE_OUT_OF_MEMORY_ERROR;
        goto ret_point;
    }
#ifdef DBG_LOG
    char dbg_hex_string[256];
    aesm_dbg_format_hex(msg, msg_size, dbg_hex_string, 256);
    AESM_DBG_TRACE("send msg \"%s\" to server:%s",dbg_hex_string, url);
#endif
    memset(encode_msg, 0, encoding_size);
    if(!encode_request(msg, msg_size, encode_msg, &encoding_size)){
        AESM_DBG_ERROR("message encoding error, msg size %d",msg_size);
        ae_ret = PVE_UNEXPECTED_ERROR;
        goto ret_point;
    }
    AESM_DBG_TRACE("encoded msg %.*s",encoding_size, encode_msg);
    ae_ret = aesm_network_send_receive(url, encode_msg, encoding_size,
        &recv_msg, &recv_size, POST, false);
    if(ae_ret != AE_SUCCESS ){
        AESM_DBG_ERROR("fail to send encoded msg (size=%d) to url:%s",encoding_size, url);
        goto ret_point;
    }
    if(recv_msg == NULL){
        AESM_DBG_ERROR("recv NULL message from backend server");
        ae_ret = PVE_UNEXPECTED_ERROR;
        goto ret_point;
    }
    AESM_DBG_TRACE("response msg %.*s", recv_size, recv_msg);
    decode_buffer_size= get_response_decoding_length(recv_size);

    if(decode_buffer_size == 0){
        AESM_DBG_ERROR("response 0 length message from backend server:%s",url);
        ae_ret = PVE_UNEXPECTED_ERROR;
        goto ret_point;
    }
    AESM_DBG_TRACE("Succ recv msg:%.*s", recv_size, recv_msg);

    resp = reinterpret_cast<uint8_t *>(malloc(decode_buffer_size));
    if(resp == NULL){
        AESM_DBG_ERROR("malloc error");
        ae_ret = AE_OUT_OF_MEMORY_ERROR;
        goto ret_point;
    }
    memset(resp, 0, decode_buffer_size);
    if(!decode_response(recv_msg,recv_size, resp,  &decode_buffer_size)){
        AESM_DBG_WARN("fail to decode message from server");
        ae_ret = PVE_MSG_ERROR;
        goto ret_point;
    }
#ifdef DBG_LOG
    aesm_dbg_format_hex(resp, decode_buffer_size, dbg_hex_string, 256);
    AESM_DBG_TRACE("succ decode msg \"%s\" ",dbg_hex_string);
#endif
    resp_size = decode_buffer_size;
ret_point:
    aesm_free_network_response_buffer(recv_msg);
    if(ae_ret != AE_SUCCESS){
        if(resp!=NULL)free(resp);
        resp = NULL;
    }
    if(encode_msg!=NULL)free(encode_msg);
    return ae_ret;
}


void AESMNetworkEncoding::aesm_free_response_msg(uint8_t *resp)
{
    if(resp!=NULL){
        free(resp);
    }
}


ae_error_t AESMNetworkEncoding::aesm_send_recv_msg_encoding(const char *url, const uint8_t * msg, uint32_t msg_size, uint8_t* &resp, uint32_t& resp_size)
{
    resp = NULL;
    resp_size = 0;
    AESM_DBG_TRACE("send msg  to url %s",url);
    //call global function to encoding message, send/receive message via HTTP POST and decode response message
    return aesm_send_recv_msg_encoding_internal(url, msg, msg_size, resp, resp_size);
}