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Code Issues Releases Wiki Activity

Integration of agent code signing into MeshCentral.

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Ylian Saint-Hilaire 2022-05-28 22:34:48 -07:00
parent e37b511eb3
commit 82254b80ed
4 changed files with 198 additions and 134 deletions
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48
authenticode.js
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@ -6,6 +6,13 @@
* @version v0.0.1
*/
/*jslint node: true */
/*jshint node: true */
/*jshint strict:false */
/*jshint -W097 */
/*jshint esversion: 6 */
"use strict";
const fs = require('fs');
const crypto = require('crypto');
const forge = require('node-forge');
@ -109,29 +116,29 @@ function createAuthenticodeHandler(path) {
// Open the file and read header information
function openFile() {
if (obj.fd != null) return;
if (obj.fd != null) return true;
// Open the file descriptor
obj.path = path;
obj.fd = fs.openSync(path);
try { obj.fd = fs.openSync(path); } catch (ex) { return false; } // Unable to open file
obj.stats = fs.fstatSync(obj.fd);
obj.filesize = obj.stats.size;
if (obj.filesize < 64) { throw ('File too short.'); }
if (obj.filesize < 64) { obj.close(); return false; } // File too short.
// Read the PE header size
var buf = readFileSlice(60, 4);
obj.header.header_size = buf.readUInt32LE(0);
// Check file size and PE header
if (obj.filesize < (160 + obj.header.header_size)) { throw ('Invalid SizeOfHeaders.'); }
if (readFileSlice(obj.header.header_size, 4).toString('hex') != '50450000') { throw ('Invalid PE File.'); }
if (obj.filesize < (160 + obj.header.header_size)) { obj.close(); return false; } // Invalid SizeOfHeaders.
if (readFileSlice(obj.header.header_size, 4).toString('hex') != '50450000') { obj.close(); return false; } // Invalid PE File.
// Check header magic data
var magic = readFileSlice(obj.header.header_size + 24, 2).readUInt16LE(0);
switch (magic) {
case 0x20b: obj.header.pe32plus = 1; break;
case 0x10b: obj.header.pe32plus = 0; break;
default: throw ('Invalid Magic in PE');
default: { obj.close(); return false; } // Invalid Magic in PE
}
// Read PE header information
@ -146,7 +153,7 @@ function createAuthenticodeHandler(path) {
// Read signature block
// Check if the file size allows for the signature block
if (obj.filesize < (obj.header.sigpos + obj.header.siglen)) { throw ('Executable file too short to contain the signature block.'); }
if (obj.filesize < (obj.header.sigpos + obj.header.siglen)) { obj.close(); return false; } // Executable file too short to contain the signature block.
// Remove the padding if needed
var i, pkcs7raw = readFileSlice(obj.header.sigpos + 8, obj.header.siglen - 8);
@ -207,12 +214,13 @@ function createAuthenticodeHandler(path) {
obj.fileHashSigned = Buffer.from(pkcs7content.value[1].value[1].value, 'binary')
// Compute the actual file hash
if (obj.fileHashAlgo != null) { obj.fileHashActual = getHash(obj.fileHashAlgo); }
if (obj.fileHashAlgo != null) { obj.fileHashActual = obj.getHash(obj.fileHashAlgo); }
}
return true;
}
// Hash the file using the selected hashing system
function getHash(algo) {
obj.getHash = function(algo) {
var hash = crypto.createHash(algo);
runHash(hash, 0, obj.header.header_size + 88);
runHash(hash, obj.header.header_size + 88 + 4, obj.header.header_size + 152 + (obj.header.pe32plus * 16));
@ -229,7 +237,7 @@ function createAuthenticodeHandler(path) {
// Sign the file using the certificate and key. If none is specified, generate a dummy one
obj.sign = function (cert, args) {
if (cert == null) { cert = createSelfSignedCert({ cn: 'Test' }); }
var fileHash = getHash('sha384');
var fileHash = obj.getHash('sha384');
// Create the signature block
var p7 = forge.pkcs7.createSignedData();
@ -246,8 +254,12 @@ function createAuthenticodeHandler(path) {
{ type: forge.pki.oids.messageDigest } // This value will populated at signing time by node-forge
]
if ((typeof args.desc == 'string') || (typeof args.url == 'string')) {
var codeSigningAttributes = { 'tagClass': 0, 'type': 16, 'constructed': true, 'composed': true, 'value': [ ] };
if (args.desc != null) { codeSigningAttributes.value.push({ 'tagClass': 128, 'type': 0, 'constructed': true, 'composed': true, 'value': [{ 'tagClass': 128, 'type': 0, 'constructed': false, 'composed': false, 'value': Buffer.from(args.desc, 'ucs2').toString() }] }); }
var codeSigningAttributes = { 'tagClass': 0, 'type': 16, 'constructed': true, 'composed': true, 'value': [] };
if (args.desc != null) { // Encode description as big-endian unicode.
var desc = "", ucs = Buffer.from(args.desc, 'ucs2').toString()
for (var k = 0; k < ucs.length; k += 2) { desc += String.fromCharCode(ucs.charCodeAt(k + 1), ucs.charCodeAt(k)); }
codeSigningAttributes.value.push({ 'tagClass': 128, 'type': 0, 'constructed': true, 'composed': true, 'value': [{ 'tagClass': 128, 'type': 0, 'constructed': false, 'composed': false, 'value': desc }] });
}
if (args.url != null) { codeSigningAttributes.value.push({ 'tagClass': 128, 'type': 1, 'constructed': true, 'composed': true, 'value': [{ 'tagClass': 128, 'type': 0, 'constructed': false, 'composed': false, 'value': args.url }] }); }
authenticatedAttributes.push({ type: obj.Oids.SPC_SP_OPUS_INFO_OBJID, value: codeSigningAttributes });
}
@ -330,8 +342,8 @@ function createAuthenticodeHandler(path) {
fs.closeSync(output);
}
openFile();
return obj;
// Return null if we could not open the file
return (openFile() ? obj : null);
}
function start() {
@ -410,7 +422,7 @@ function start() {
if (typeof args.exe != 'string') { console.log("Missing --exe [filename]"); return; }
createOutFile(args, args.exe);
const cert = loadCertificates(args);
if (cert == null) { console.log("Unable to load certificate and/or private key, generating text certificate."); }
if (cert == null) { console.log("Unable to load certificate and/or private key, generating test certificate."); }
console.log("Signing to " + args.out); exe.sign(cert, args); console.log("Done.");
}
if (command == 'unsign') { // Unsign an executable
@ -433,4 +445,8 @@ function start() {
if (exe != null) { exe.close(); }
}
start();
// If this is the main module, run the command line version
if (require.main === module) { start(); }
// Exports
module.exports.createAuthenticodeHandler = createAuthenticodeHandler;