mirror of
https://github.com/Ylianst/MeshCentral.git
synced 2024-11-10 14:01:27 +03:00
311 lines
16 KiB
JavaScript
311 lines
16 KiB
JavaScript
/*
|
|
Copyright 2018-2022 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.
|
|
*/
|
|
|
|
/*xjslint node: true */
|
|
/*xjslint plusplus: true */
|
|
/*xjslint maxlen: 256 */
|
|
/*jshint node: true */
|
|
/*jshint strict: false */
|
|
/*jshint esversion: 6 */
|
|
"use strict";
|
|
|
|
const exeJavaScriptGuid = 'B996015880544A19B7F7E9BE44914C18';
|
|
const exeMeshPolicyGuid = 'B996015880544A19B7F7E9BE44914C19';
|
|
const exeNullPolicyGuid = 'B996015880544A19B7F7E9BE44914C20';
|
|
|
|
|
|
// Changes a Windows Executable to add JavaScript inside of it.
|
|
// This method will write to destination stream and close it.
|
|
//
|
|
// options = {
|
|
// platform: 'win32' or 'linux',
|
|
// sourceFileName: 'pathToBinary',
|
|
// destinationStream: 'outputStream'
|
|
// js: 'jsContent',
|
|
// peinfo {} // Optional, if PE header already parsed place it here.
|
|
// }
|
|
//
|
|
module.exports.streamExeWithJavaScript = function (options) {
|
|
// Check all inputs
|
|
if (!options.platform) { throw ('platform not specified'); }
|
|
if (!options.destinationStream) { throw ('destination stream was not specified'); }
|
|
if (!options.sourceFileName) { throw ('source file not specified'); }
|
|
if (!options.js) { throw ('js content not specified'); }
|
|
|
|
// If a Windows binary, parse it if not already parsed
|
|
if ((options.platform == 'win32') && (!options.peinfo)) { options.peinfo = module.exports.parseWindowsExecutable(options.sourceFileName); }
|
|
|
|
// If unsigned Windows or Linux, we merge at the end with the GUID and no padding.
|
|
if (((options.platform == 'win32') && (options.peinfo.CertificateTableAddress == 0)) || (options.platform != 'win32')) {
|
|
// This is not a signed binary, so we can just send over the EXE then the MSH
|
|
options.destinationStream.sourceStream = require('fs').createReadStream(options.sourceFileName, { flags: 'r' });
|
|
options.destinationStream.sourceStream.options = options;
|
|
options.destinationStream.sourceStream.on('end', function () {
|
|
// Once the binary is streamed, write the msh + length + guid in that order.
|
|
this.options.destinationStream.write(this.options.js); // JS content
|
|
var sz = Buffer.alloc(4);
|
|
sz.writeUInt32BE(this.options.js.length, 0);
|
|
this.options.destinationStream.write(sz); // Length in small endian
|
|
this.options.destinationStream.end(Buffer.from(exeJavaScriptGuid, 'hex')); // GUID
|
|
});
|
|
// Pipe the entire source binary without ending the stream.
|
|
options.destinationStream.sourceStream.pipe(options.destinationStream, { end: false });
|
|
} else {
|
|
throw ('streamExeWithJavaScript(): Cannot stream JavaScript with signed executable.');
|
|
}
|
|
};
|
|
|
|
|
|
// Changes a Windows Executable to add the MSH inside of it.
|
|
// This method will write to destination stream and close it.
|
|
//
|
|
// options = {
|
|
// platform: 'win32' or 'linux',
|
|
// sourceFileName: 'pathToBinary',
|
|
// destinationStream: 'outputStream'
|
|
// msh: 'mshContent',
|
|
// randomPolicy: true, // Set is the MSH contains random data
|
|
// peinfo {} // Optional, if PE header already parsed place it here.
|
|
// }
|
|
//
|
|
module.exports.streamExeWithMeshPolicy = function (options) {
|
|
// Check all inputs
|
|
if (!options.platform) { throw ('platform not specified'); }
|
|
if (!options.destinationStream) { throw ('destination stream was not specified'); }
|
|
if (!options.sourceFileName) { throw ('source file not specified'); }
|
|
if (!options.msh) { throw ('msh content not specified'); }
|
|
options.mshbuf = Buffer.from(options.msh, 'utf8');
|
|
|
|
// If a Windows binary, parse it if not already parsed
|
|
if ((options.platform == 'win32') && (!options.peinfo)) { options.peinfo = module.exports.parseWindowsExecutable(options.sourceFileName); }
|
|
|
|
// If unsigned Windows or Linux, we merge at the end with the GUID and no padding.
|
|
if ((options.platform == 'win32' && options.peinfo.CertificateTableAddress == 0) || options.platform != 'win32') {
|
|
// This is not a signed binary, so we can just send over the EXE then the MSH
|
|
options.destinationStream.sourceStream = require('fs').createReadStream(options.sourceFileName, { flags: 'r' });
|
|
options.destinationStream.sourceStream.options = options;
|
|
options.destinationStream.sourceStream.on('end', function () {
|
|
// Once the binary is streamed, write the msh + length + guid in that order.
|
|
this.options.destinationStream.write(this.options.mshbuf); // MSH
|
|
var sz = Buffer.alloc(4);
|
|
sz.writeUInt32BE(this.options.mshbuf.length, 0);
|
|
this.options.destinationStream.write(sz); // Length in small endian
|
|
this.options.destinationStream.end(Buffer.from((this.options.randomPolicy === true) ? exeNullPolicyGuid : exeMeshPolicyGuid, 'hex')); // Guid
|
|
});
|
|
// Pipe the entire source binary without ending the stream.
|
|
options.destinationStream.sourceStream.pipe(options.destinationStream, { end: false });
|
|
} else if (options.platform == 'win32' && options.peinfo.CertificateTableAddress != 0) {
|
|
// Read up to the certificate table size and stream that out
|
|
options.destinationStream.sourceStream = require('fs').createReadStream(options.sourceFileName, { flags: 'r', start: 0, end: options.peinfo.CertificateTableSizePos - 1 });
|
|
options.destinationStream.sourceStream.mshPadding = (8 - ((options.peinfo.certificateDwLength + options.mshbuf.length + 20) % 8)) % 8; // Compute the padding with quad-align
|
|
options.destinationStream.sourceStream.CertificateTableSize = (options.peinfo.CertificateTableSize + options.mshbuf.length + 20 + options.destinationStream.sourceStream.mshPadding); // Add to the certificate table size
|
|
options.destinationStream.sourceStream.certificateDwLength = (options.peinfo.certificateDwLength + options.mshbuf.length + 20 + options.destinationStream.sourceStream.mshPadding); // Add to the certificate size
|
|
options.destinationStream.sourceStream.options = options;
|
|
|
|
options.destinationStream.sourceStream.on('end', function () {
|
|
// We sent up to the CertificateTableSize, now we need to send the updated certificate table size
|
|
var sz = Buffer.alloc(4);
|
|
sz.writeUInt32LE(this.CertificateTableSize, 0);
|
|
this.options.destinationStream.write(sz); // New cert table size
|
|
|
|
// Stream everything up to the start of the certificate table entry
|
|
var source2 = require('fs').createReadStream(options.sourceFileName, { flags: 'r', start: this.options.peinfo.CertificateTableSizePos + 4, end: this.options.peinfo.CertificateTableAddress - 1 });
|
|
source2.options = this.options;
|
|
source2.mshPadding = this.mshPadding;
|
|
source2.certificateDwLength = this.certificateDwLength;
|
|
source2.on('end', function () {
|
|
// We've sent up to the Certificate DWLength, which we need to update
|
|
var sz = Buffer.alloc(4);
|
|
sz.writeUInt32LE(this.certificateDwLength, 0);
|
|
this.options.destinationStream.write(sz); // New certificate length
|
|
|
|
// Stream the entire binary until the end
|
|
var source3 = require('fs').createReadStream(options.sourceFileName, { flags: 'r', start: this.options.peinfo.CertificateTableAddress + 4 });
|
|
source3.options = this.options;
|
|
source3.mshPadding = this.mshPadding;
|
|
source3.on('end', function () {
|
|
// We've sent the entire binary... Now send: Padding + MSH + MSHLength + GUID
|
|
if (this.mshPadding > 0) { this.options.destinationStream.write(Buffer.alloc(this.mshPadding)); } // Padding
|
|
this.options.destinationStream.write(this.options.mshbuf); // MSH content
|
|
var sz = Buffer.alloc(4);
|
|
sz.writeUInt32BE(this.options.mshbuf.length, 0);
|
|
this.options.destinationStream.write(sz); // MSH Length, small-endian
|
|
this.options.destinationStream.end(Buffer.from((this.options.randomPolicy === true) ? exeNullPolicyGuid : exeMeshPolicyGuid, 'hex')); // Guid
|
|
});
|
|
source3.pipe(this.options.destinationStream, { end: false });
|
|
this.options.sourceStream = source3;
|
|
});
|
|
source2.pipe(this.options.destinationStream, { end: false });
|
|
this.options.destinationStream.sourceStream = source2;
|
|
});
|
|
options.destinationStream.sourceStream.pipe(options.destinationStream, { end: false });
|
|
}
|
|
};
|
|
|
|
|
|
// Return information about this executable
|
|
// This works only on Windows binaries
|
|
module.exports.parseWindowsExecutable = function (exePath) {
|
|
var retVal = {};
|
|
var fs = require('fs');
|
|
var fd = fs.openSync(exePath, 'r');
|
|
var bytesRead;
|
|
var dosHeader = Buffer.alloc(64);
|
|
var ntHeader = Buffer.alloc(24);
|
|
var optHeader;
|
|
var numRVA;
|
|
|
|
// 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);
|
|
|
|
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());
|
|
}
|
|
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);
|
|
};
|
|
|
|
|
|
//
|
|
// Hash a executable file. Works on both Windows and Linux.
|
|
// On Windows, will hash so that signature or .msh addition will not change the hash. Adding a .js on un-signed executable will change the hash.
|
|
//
|
|
// options = {
|
|
// sourcePath: <string> Executable Path
|
|
// targetStream: <stream.writeable> Hashing Stream
|
|
// platform: <string> Optional. Same value as process.platform ('win32' | 'linux' | 'darwin')
|
|
// }
|
|
//
|
|
module.exports.hashExecutableFile = function (options) {
|
|
if (!options.sourcePath || !options.targetStream) { throw ('Please specify sourcePath and targetStream'); }
|
|
var fs = require('fs');
|
|
|
|
// If not specified, try to determine platform type
|
|
if (!options.platform) {
|
|
try {
|
|
// If we can parse the executable, we know it's windows.
|
|
options.peinfo = module.exports.parseWindowsExecutable(options.sourcePath);
|
|
options.platform = 'win32';
|
|
} catch (e) {
|
|
options.platform = 'other';
|
|
}
|
|
}
|
|
|
|
// Setup initial state
|
|
options.state = { endIndex: 0, checkSumIndex: 0, tableIndex: 0, stats: fs.statSync(options.sourcePath) };
|
|
|
|
if (options.platform == 'win32') {
|
|
if (options.peinfo.CertificateTableAddress != 0) { options.state.endIndex = options.peinfo.CertificateTableAddress; }
|
|
options.state.tableIndex = options.peinfo.CertificateTableSizePos - 4;
|
|
options.state.checkSumIndex = options.peinfo.CheckSumPos;
|
|
}
|
|
|
|
if (options.state.endIndex == 0) {
|
|
// We just need to check for Embedded MSH file
|
|
var fd = fs.openSync(options.sourcePath, 'r');
|
|
var guid = Buffer.alloc(16);
|
|
var bytesRead;
|
|
|
|
bytesRead = fs.readSync(fd, guid, 0, guid.length, options.state.stats.size - 16);
|
|
if (guid.toString('hex') == exeMeshPolicyGuid) {
|
|
bytesRead = fs.readSync(fd, guid, 0, 4, options.state.stats.size - 20);
|
|
options.state.endIndex = options.state.stats.size - 20 - guid.readUInt32LE(0);
|
|
} else {
|
|
options.state.endIndex = options.state.stats.size;
|
|
}
|
|
fs.closeSync(fd);
|
|
}
|
|
|
|
// Linux does not have a checksum
|
|
if (options.state.checkSumIndex != 0) {
|
|
// Windows
|
|
options.state.source = fs.createReadStream(options.sourcePath, { flags: 'r', start: 0, end: options.state.checkSumIndex - 1 });
|
|
options.state.source.on('end', function () {
|
|
options.targetStream.write(Buffer.alloc(4));
|
|
var source = fs.createReadStream(options.sourcePath, { flags: 'r', start: options.state.checkSumIndex + 4, end: options.state.tableIndex - 1 });
|
|
source.on('end', function () {
|
|
options.targetStream.write(Buffer.alloc(8));
|
|
var source = fs.createReadStream(options.sourcePath, { flags: 'r', start: options.state.tableIndex + 8, end: options.state.endIndex - 1 });
|
|
options.state.source = source;
|
|
options.state.source.pipe(options.targetStream);
|
|
});
|
|
options.state.source = source;
|
|
options.state.source.pipe(options.targetStream, { end: false });
|
|
});
|
|
options.state.source.pipe(options.targetStream, { end: false });
|
|
} else {
|
|
// Linux
|
|
options.state.source = fs.createReadStream(options.sourcePath, { flags: 'r', start: 0, end: options.state.endIndex - 1 });
|
|
options.state.source.pipe(options.targetStream);
|
|
}
|
|
};
|