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MeshAgent/modules/PE_Parser.js
Ylian Saint-Hilaire 4b5c77b4fd Many improvements.
2018-02-11 21:11:58 -08:00

106 lines
3.8 KiB
JavaScript

/*
Copyright 2018 Intel Corporation
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// Return information about this executable
function parse(exePath)
{
var retVal = {};
var fs = require('fs');
var fd = fs.openSync(exePath, 'rb');
var bytesRead;
var dosHeader = Buffer.alloc(64);
var ntHeader = Buffer.alloc(24);
var optHeader;
// Read the DOS header
bytesRead = fs.readSync(fd, dosHeader, 0, 64, 0);
if (dosHeader.readUInt16LE(0).toString(16).toUpperCase() != '5A4D')
{
throw ('unrecognized binary format');
}
// Read the NT header
bytesRead = fs.readSync(fd, ntHeader, 0, ntHeader.length, dosHeader.readUInt32LE(60));
if (ntHeader.slice(0, 4).toString('hex') != '50450000')
{
throw ('not a PE file');
}
switch (ntHeader.readUInt16LE(4).toString(16))
{
case '14c': // 32 bit
retVal.format = 'x86';
break;
case '8664': // 64 bit
retVal.format = 'x64';
break;
default: // Unknown
retVal.format = undefined;
break;
}
retVal.optionalHeaderSize = ntHeader.readUInt16LE(20);
retVal.optionalHeaderSizeAddress = dosHeader.readUInt32LE(60) + 20;
// Read the optional header
optHeader = Buffer.alloc(ntHeader.readUInt16LE(20));
bytesRead = fs.readSync(fd, optHeader, 0, optHeader.length, dosHeader.readUInt32LE(60) + 24);
var numRVA = undefined;
retVal.CheckSumPos = dosHeader.readUInt32LE(60) + 24 + 64;
retVal.SizeOfCode = optHeader.readUInt32LE(4);
retVal.SizeOfInitializedData = optHeader.readUInt32LE(8);
retVal.SizeOfUnInitializedData = optHeader.readUInt32LE(12);
switch (optHeader.readUInt16LE(0).toString(16).toUpperCase())
{
case '10B': // 32 bit binary
numRVA = optHeader.readUInt32LE(92);
retVal.CertificateTableAddress = optHeader.readUInt32LE(128);
retVal.CertificateTableSize = optHeader.readUInt32LE(132);
retVal.CertificateTableSizePos = dosHeader.readUInt32LE(60) + 24 + 132;
retVal.rvaStartAddress = dosHeader.readUInt32LE(60) + 24 + 96;
break;
case '20B': // 64 bit binary
numRVA = optHeader.readUInt32LE(108);
retVal.CertificateTableAddress = optHeader.readUInt32LE(144);
retVal.CertificateTableSize = optHeader.readUInt32LE(148);
retVal.CertificateTableSizePos = dosHeader.readUInt32LE(60) + 24 + 148;
retVal.rvaStartAddress = dosHeader.readUInt32LE(60) + 24 + 112;
break;
default:
throw ('Unknown Value found for Optional Magic: ' + ntHeader.readUInt16LE(24).toString(16).toUpperCase());
break;
}
retVal.rvaCount = numRVA;
if (retVal.CertificateTableAddress)
{
// Read the authenticode certificate, only one cert (only the first entry)
var hdr = Buffer.alloc(8);
fs.readSync(fd, hdr, 0, hdr.length, retVal.CertificateTableAddress);
retVal.certificate = Buffer.alloc(hdr.readUInt32LE(0));
fs.readSync(fd, retVal.certificate, 0, retVal.certificate.length, retVal.CertificateTableAddress + hdr.length);
retVal.certificate = retVal.certificate.toString('base64');
retVal.certificateDwLength = hdr.readUInt32LE(0);
}
fs.closeSync(fd);
return (retVal);
}
module.exports = parse;