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meshcentral

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Web based remote computer management server

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/** * @description Authenticode parsing * @author Ylian Saint-Hilaire & Bryan Roe * @copyright Intel Corporation 2018-2022 * @license Apache-2.0 * @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'); const pki = forge.pki; const p7 = require('./pkcs7-modified'); // Generate a test self-signed certificate with code signing extension function createSelfSignedCert(args) { var keys = pki.rsa.generateKeyPair(2048); var cert = pki.createCertificate(); cert.publicKey = keys.publicKey; cert.serialNumber = (typeof args.serial == 'string')?args.serial:'012345'; // Serial number must always have a single leading '0', otherwise toPEM/fromPEM will not work right. cert.validity.notBefore = new Date(); cert.validity.notAfter = new Date(); cert.validity.notAfter.setFullYear(cert.validity.notBefore.getFullYear() + 10); var attrs = []; if (typeof args.cn == 'string') { attrs.push({ name: 'commonName', value: args.cn }); } if (typeof args.country == 'string') { attrs.push({ name: 'countryName', value: args.country }); } if (typeof args.state == 'string') { attrs.push({ name: 'ST', value: args.state }); } if (typeof args.locality == 'string') { attrs.push({ name: 'localityName', value: args.locality }); } if (typeof args.org == 'string') { attrs.push({ name: 'organizationName', value: args.org }); } if (typeof args.orgunit == 'string') { attrs.push({ name: 'OU', value: args.orgunit }); } cert.setSubject(attrs); cert.setIssuer(attrs); cert.setExtensions([{ name: 'basicConstraints', cA: false }, { name: 'keyUsage', keyCertSign: false, digitalSignature: true, nonRepudiation: false, keyEncipherment: false, dataEncipherment: false }, { name: 'extKeyUsage', codeSigning: true }, { name: "subjectKeyIdentifier" }]); cert.sign(keys.privateKey, forge.md.sha384.create()); return { cert: cert, key: keys.privateKey, extraCerts: [] }; } // Create the output filename if not already specified function createOutFile(args, filename) { if (typeof args.out == 'string') return; var outputFileName = filename.split('.'); outputFileName[outputFileName.length - 2] += '-out'; args.out = outputFileName.join('.'); } // Hash an object function hashObject(obj) { if (obj == null) { return null; } const hash = crypto.createHash('sha384'); if (Buffer.isBuffer(obj)) { hash.update(obj); } else { hash.update(JSON.stringify(obj)); } return hash.digest().toString('hex'); } // Load a .bmp file. function loadBitmap(bitmapFile) { var bitmapData = null; try { bitmapData = fs.readFileSync(bitmapFile); } catch (ex) { } if ((bitmapData == null) || (bitmapData.length < 14) || (bitmapData[0] != 0x42) || (bitmapData[1] != 0x4D)) return null; return bitmapData.slice(14); } // Load a .ico file. This will load all icons in the file into a icon group object function loadIcon(iconFile) { var iconData = null; try { iconData = fs.readFileSync(iconFile); } catch (ex) { } if ((iconData == null) || (iconData.length < 6) || (iconData[0] != 0) || (iconData[1] != 0)) return null; const r = { resType: iconData.readUInt16LE(2), resCount: iconData.readUInt16LE(4), icons: {} }; if (r.resType != 1) return null; var ptr = 6; for (var i = 1; i <= r.resCount; i++) { var icon = {}; icon.width = iconData[ptr + 0]; icon.height = iconData[ptr + 1]; icon.colorCount = iconData[ptr + 2]; icon.planes = iconData.readUInt16LE(ptr + 4); icon.bitCount = iconData.readUInt16LE(ptr + 6); icon.bytesInRes = iconData.readUInt32LE(ptr + 8); icon.iconCursorId = i; const offset = iconData.readUInt32LE(ptr + 12); icon.icon = iconData.slice(offset, offset + icon.bytesInRes); r.icons[i] = icon; ptr += 16; } return r; } // Load certificates and private key from PEM files function loadCertificates(pemFileNames) { var certs = [], keys = []; if (pemFileNames == null) return; if (typeof pemFileNames == 'string') { pemFileNames = [pemFileNames]; } for (var i in pemFileNames) { try { // Read certificate var pem = fs.readFileSync(pemFileNames[i]).toString(); var pemCerts = pem.split('-----BEGIN CERTIFICATE-----'); for (var j in pemCerts) { var k = pemCerts[j].indexOf('-----END CERTIFICATE-----'); if (k >= 0) { certs.push(pki.certificateFromPem('-----BEGIN CERTIFICATE-----' + pemCerts[j].substring(0, k) + '-----END CERTIFICATE-----')); } } var PemKeys = pem.split('-----BEGIN RSA PRIVATE KEY-----'); for (var j in PemKeys) { var k = PemKeys[j].indexOf('-----END RSA PRIVATE KEY-----'); if (k >= 0) { keys.push(pki.privateKeyFromPem('-----BEGIN RSA PRIVATE KEY-----' + PemKeys[j].substring(0, k) + '-----END RSA PRIVATE KEY-----')); } } PemKeys = pem.split('-----BEGIN PRIVATE KEY-----'); for (var j in PemKeys) { var k = PemKeys[j].indexOf('-----END PRIVATE KEY-----'); if (k >= 0) { keys.push(pki.privateKeyFromPem('-----BEGIN PRIVATE KEY-----' + PemKeys[j].substring(0, k) + '-----END PRIVATE KEY-----')); } } } catch (ex) { } } if ((certs.length == 0) || (keys.length != 1)) return; // No certificates or private keys var r = { cert: certs[0], key: keys[0], extraCerts: [] } if (certs.length > 1) { for (var i = 1; i < certs.length; i++) { r.extraCerts.push(certs[i]); } } return r; } function createAuthenticodeHandler(path) { const obj = {}; obj.header = { path: path } // Read a file slice function readFileSlice(start, length) { var buffer = Buffer.alloc(length); var len = fs.readSync(obj.fd, buffer, 0, buffer.length, start); if (len < buffer.length) { buffer = buffer.slice(0, len); } return buffer; } // Close the file obj.close = function () { if (obj.fd == null) return; fs.closeSync(obj.fd); delete obj.fd; } // Private OIDS obj.Oids = { SPC_INDIRECT_DATA_OBJID: '1.3.6.1.4.1.311.2.1.4', SPC_STATEMENT_TYPE_OBJID: '1.3.6.1.4.1.311.2.1.11', SPC_SP_OPUS_INFO_OBJID: '1.3.6.1.4.1.311.2.1.12', SPC_INDIVIDUAL_SP_KEY_PURPOSE_OBJID: '1.3.6.1.4.1.311.2.1.21', SPC_COMMERCIAL_SP_KEY_PURPOSE_OBJID: '1.3.6.1.4.1.311.2.1.22', SPC_MS_JAVA_SOMETHING: '1.3.6.1.4.1.311.15.1', SPC_PE_IMAGE_DATA_OBJID: '1.3.6.1.4.1.311.2.1.15', SPC_CAB_DATA_OBJID: '1.3.6.1.4.1.311.2.1.25', SPC_TIME_STAMP_REQUEST_OBJID: '1.3.6.1.4.1.311.3.2.1', SPC_SIPINFO_OBJID: '1.3.6.1.4.1.311.2.1.30', SPC_PE_IMAGE_PAGE_HASHES_V1: '1.3.6.1.4.1.311.2.3.1', SPC_PE_IMAGE_PAGE_HASHES_V2: '1.3.6.1.4.1.311.2.3.2', SPC_NESTED_SIGNATURE_OBJID: '1.3.6.1.4.1.311.2.4.1', SPC_RFC3161_OBJID: '1.3.6.1.4.1.311.3.3.1' } // Open the file and read header information function openFile() { if (obj.fd != null) return true; // Open the file descriptor obj.path = path; try { obj.fd = fs.openSync(path, 'r'); } catch (ex) { return false; } // Unable to open file obj.stats = fs.fstatSync(obj.fd); obj.filesize = obj.stats.size; if (obj.filesize < 64) { obj.close(); return false; } // File too short. // Read the DOS header (64 bytes) var buf = readFileSlice(60, 4); obj.header.peHeaderLocation = buf.readUInt32LE(0); // The DOS header is 64 bytes long, the last 4 bytes are a pointer to the PE header. obj.header.peOptionalHeaderLocation = obj.header.peHeaderLocation + 24; // The PE optional header is located just after the PE header which is 24 bytes long. // Check file size and signature if (obj.filesize < (160 + obj.header.peHeaderLocation)) { obj.close(); return false; } // Invalid SizeOfHeaders. if (readFileSlice(obj.header.peHeaderLocation, 4).toString('hex') != '50450000') { obj.close(); return false; } // Invalid PE header, must start with "PE" (HEX: 50 45 00 00). // Read the COFF header // https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#coff-file-header-object-and-image var coffHeader = readFileSlice(obj.header.peHeaderLocation + 4, 20) obj.header.coff = {}; obj.header.coff.machine = coffHeader.readUInt16LE(0); obj.header.coff.numberOfSections = coffHeader.readUInt16LE(2); obj.header.coff.timeDateStamp = coffHeader.readUInt32LE(4); obj.header.coff.pointerToSymbolTable = coffHeader.readUInt32LE(8); obj.header.coff.numberOfSymbols = coffHeader.readUInt32LE(12); obj.header.coff.sizeOfOptionalHeader = coffHeader.readUInt16LE(16); obj.header.coff.characteristics = coffHeader.readUInt16LE(18); // Read the entire PE optional header var optinalHeader = readFileSlice(obj.header.peOptionalHeaderLocation, obj.header.coff.sizeOfOptionalHeader); // Decode the PE optional header standard fields // https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#optional-header-standard-fields-image-only obj.header.peStandard = {}; obj.header.peStandard.magic = optinalHeader.readUInt16LE(0); switch (obj.header.peStandard.magic) { // Check magic value case 0x020B: obj.header.pe32plus = 1; break; case 0x010B: obj.header.pe32plus = 0; break; default: { obj.close(); return false; } // Invalid Magic in PE } obj.header.peStandard.majorLinkerVersion = optinalHeader[2]; obj.header.peStandard.minorLinkerVersion = optinalHeader[3]; obj.header.peStandard.sizeOfCode = optinalHeader.readUInt32LE(4); obj.header.peStandard.sizeOfInitializedData = optinalHeader.readUInt32LE(8); obj.header.peStandard.sizeOfUninitializedData = optinalHeader.readUInt32LE(12); obj.header.peStandard.addressOfEntryPoint = optinalHeader.readUInt32LE(16); obj.header.peStandard.baseOfCode = optinalHeader.readUInt32LE(20); if (obj.header.pe32plus == 0) { obj.header.peStandard.baseOfData = optinalHeader.readUInt32LE(24); } // Decode the PE optional header windows fields // https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#optional-header-windows-specific-fields-image-only obj.header.peWindows = {} if (obj.header.pe32plus == 0) { // 32bit header //obj.header.peWindows.imageBase = optinalHeader.readUInt32LE(28); obj.header.peWindows.sectionAlignment = optinalHeader.readUInt32LE(32); obj.header.peWindows.fileAlignment = optinalHeader.readUInt32LE(36); obj.header.peWindows.majorOperatingSystemVersion = optinalHeader.readUInt16LE(40); obj.header.peWindows.minorOperatingSystemVersion = optinalHeader.readUInt16LE(42); obj.header.peWindows.majorImageVersion = optinalHeader.readUInt16LE(44); obj.header.peWindows.minorImageVersion = optinalHeader.readUInt16LE(46); obj.header.peWindows.majorSubsystemVersion = optinalHeader.readUInt16LE(48); obj.header.peWindows.minorSubsystemVersion = optinalHeader.readUInt16LE(50); obj.header.peWindows.win32VersionValue = optinalHeader.readUInt32LE(52); obj.header.peWindows.sizeOfImage = optinalHeader.readUInt32LE(56); obj.header.peWindows.sizeOfHeaders = optinalHeader.readUInt32LE(60); obj.header.peWindows.checkSum = optinalHeader.readUInt32LE(64); obj.header.peWindows.subsystem = optinalHeader.readUInt16LE(68); obj.header.peWindows.dllCharacteristics = optinalHeader.readUInt16LE(70); //obj.header.peWindows.sizeOfStackReserve = optinalHeader.readUInt32LE(72); //obj.header.peWindows.sizeOfStackCommit = optinalHeader.readUInt32LE(76); //obj.header.peWindows.sizeOfHeapReserve = optinalHeader.readUInt32LE(80); //obj.header.peWindows.sizeOfHeapCommit = optinalHeader.readUInt32LE(84); obj.header.peWindows.loaderFlags = optinalHeader.readUInt32LE(88); obj.header.peWindows.numberOfRvaAndSizes = optinalHeader.readUInt32LE(92); } else { // 64bit header //obj.header.peWindows.imageBase = optinalHeader.readBigUInt64LE(24); // TODO: readBigUInt64LE is not supported in older NodeJS versions obj.header.peWindows.sectionAlignment = optinalHeader.readUInt32LE(32); obj.header.peWindows.fileAlignment = optinalHeader.readUInt32LE(36); obj.header.peWindows.majorOperatingSystemVersion = optinalHeader.readUInt16LE(40); obj.header.peWindows.minorOperatingSystemVersion = optinalHeader.readUInt16LE(42); obj.header.peWindows.majorImageVersion = optinalHeader.readUInt16LE(44); obj.header.peWindows.minorImageVersion = optinalHeader.readUInt16LE(46); obj.header.peWindows.majorSubsystemVersion = optinalHeader.readUInt16LE(48); obj.header.peWindows.minorSubsystemVersion = optinalHeader.readUInt16LE(50); obj.header.peWindows.win32VersionValue = optinalHeader.readUInt32LE(52); obj.header.peWindows.sizeOfImage = optinalHeader.readUInt32LE(56); obj.header.peWindows.sizeOfHeaders = optinalHeader.readUInt32LE(60); obj.header.peWindows.checkSum = optinalHeader.readUInt32LE(64); obj.header.peWindows.subsystem = optinalHeader.readUInt16LE(68); obj.header.peWindows.dllCharacteristics = optinalHeader.readUInt16LE(70); //obj.header.peWindows.sizeOfStackReserve = optinalHeader.readBigUInt64LE(72); //obj.header.peWindows.sizeOfStackCommit = optinalHeader.readBigUInt64LE(80); //obj.header.peWindows.sizeOfHeapReserve = optinalHeader.readBigUInt64LE(88); //obj.header.peWindows.sizeOfHeapCommit = optinalHeader.readBigUInt64LE(96); obj.header.peWindows.loaderFlags = optinalHeader.readUInt32LE(104); obj.header.peWindows.numberOfRvaAndSizes = optinalHeader.readUInt32LE(108); } // Decode the PE optional header data directories // https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#optional-header-data-directories-image-only obj.header.dataDirectories = {} const pePlusOffset = (obj.header.pe32plus == 0) ? 0 : 16; // This header is the same for 32 and 64 bit, but 64bit is offset by 16 bytes. obj.header.dataDirectories.exportTable = { addr: optinalHeader.readUInt32LE(96 + pePlusOffset), size: optinalHeader.readUInt32LE(100 + pePlusOffset) }; obj.header.dataDirectories.importTable = { addr: optinalHeader.readUInt32LE(104 + pePlusOffset), size: optinalHeader.readUInt32LE(108 + pePlusOffset) }; obj.header.dataDirectories.resourceTable = { addr: optinalHeader.readUInt32LE(112 + pePlusOffset), size: optinalHeader.readUInt32LE(116 + pePlusOffset) }; // Same as .rsrc virtual address & size obj.header.dataDirectories.exceptionTableAddr = { addr: optinalHeader.readUInt32LE(120 + pePlusOffset), size: optinalHeader.readUInt32LE(124 + pePlusOffset) }; // Same as .pdata virtual address & size obj.header.dataDirectories.certificateTable = { addr: optinalHeader.readUInt32LE(128 + pePlusOffset), size: optinalHeader.readUInt32LE(132 + pePlusOffset) }; obj.header.dataDirectories.baseRelocationTable = { addr: optinalHeader.readUInt32LE(136 + pePlusOffset), size: optinalHeader.readUInt32LE(140 + pePlusOffset) }; // Same as .reloc virtual address & size obj.header.dataDirectories.debug = { addr: optinalHeader.readUInt32LE(144 + pePlusOffset), size: optinalHeader.readUInt32LE(148 + pePlusOffset) }; // obj.header.dataDirectories.architecture = optinalHeader.readBigUInt64LE(152 + pePlusOffset); // Must be zero obj.header.dataDirectories.globalPtr = { addr: optinalHeader.readUInt32LE(160 + pePlusOffset), size: optinalHeader.readUInt32LE(164 + pePlusOffset) }; obj.header.dataDirectories.tLSTable = { addr: optinalHeader.readUInt32LE(168 + pePlusOffset), size: optinalHeader.readUInt32LE(172 + pePlusOffset) }; obj.header.dataDirectories.loadConfigTable = { addr: optinalHeader.readUInt32LE(176 + pePlusOffset), size: optinalHeader.readUInt32LE(180 + pePlusOffset) }; obj.header.dataDirectories.boundImport = { addr: optinalHeader.readUInt32LE(184 + pePlusOffset), size: optinalHeader.readUInt32LE(188 + pePlusOffset) }; obj.header.dataDirectories.iAT = { addr: optinalHeader.readUInt32LE(192 + pePlusOffset), size: optinalHeader.readUInt32LE(196 + pePlusOffset) }; obj.header.dataDirectories.delayImportDescriptor = { addr: optinalHeader.readUInt32LE(200 + pePlusOffset), size: optinalHeader.readUInt32LE(204 + pePlusOffset) }; obj.header.dataDirectories.clrRuntimeHeader = { addr: optinalHeader.readUInt32LE(208 + pePlusOffset), size: optinalHeader.readUInt32LE(212 + pePlusOffset) }; // obj.header.dataDirectories.reserved = optinalHeader.readBigUInt64LE(216 + pePlusOffset); // Must be zero // Get the certificate table location and size obj.header.sigpos = obj.header.dataDirectories.certificateTable.addr; obj.header.siglen = obj.header.dataDirectories.certificateTable.size obj.header.signed = ((obj.header.sigpos != 0) && (obj.header.siglen != 0)); // The section headers are located after the optional PE header obj.header.SectionHeadersPtr = obj.header.peOptionalHeaderLocation + obj.header.coff.sizeOfOptionalHeader; // Read the sections obj.header.sections = {}; for (var i = 0; i < obj.header.coff.numberOfSections; i++) { var section = {}; buf = readFileSlice(obj.header.SectionHeadersPtr + (i * 40), 40); if ((buf[0] != 46) && (buf[0] != 95)) { obj.close(); return false; }; // Name of the section must start with a dot or underscore. If not, something is wrong. var sectionName = buf.slice(0, 8).toString().trim('\0'); var j = sectionName.indexOf('\0'); if (j >= 0) { sectionName = sectionName.substring(0, j); } // Trim any trailing zeroes section.ptr = obj.header.SectionHeadersPtr + (i * 40); section.virtualSize = buf.readUInt32LE(8); section.virtualAddr = buf.readUInt32LE(12); section.rawSize = buf.readUInt32LE(16); section.rawAddr = buf.readUInt32LE(20); section.relocAddr = buf.readUInt32LE(24); section.lineNumbers = buf.readUInt32LE(28); section.relocNumber = buf.readUInt16LE(32); section.lineNumbersNumber = buf.readUInt16LE(34); section.characteristics = buf.readUInt32LE(36); obj.header.sections[sectionName] = section; } // Compute the checkSum value for this file obj.header.peWindows.checkSumActual = runChecksum(); // If there is a .rsrc section, read the resource information and locations if (obj.header.sections['.rsrc'] != null) { obj.resources = readResourceTable(obj.header.sections['.rsrc'].rawAddr, 0); // Read all resources recursively } if (obj.header.signed) { // Read signature block // Check if the file size allows for 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); var derlen = forge.asn1.getBerValueLength(forge.util.createBuffer(pkcs7raw.slice(1, 5))) + 4; if (derlen != pkcs7raw.length) { pkcs7raw = pkcs7raw.slice(0, derlen); } // Decode the signature block and check that it's valid var pkcs7der = null, valid = false; try { pkcs7der = forge.asn1.fromDer(forge.util.createBuffer(pkcs7raw)); } catch (ex) { } try { valid = ((pkcs7der != null) && (forge.asn1.derToOid(pkcs7der.value[1].value[0].value[2].value[0].value) == "1.3.6.1.4.1.311.2.1.4")); } catch (ex) { } if (pkcs7der == null) { // Can't decode the signature obj.header.sigpos = 0; obj.header.siglen = 0; obj.header.signed = false; } else { // To work around ForgeJS PKCS#7 limitation, this may break PKCS7 verify if ForgeJS adds support for it in the future // Switch content type from "1.3.6.1.4.1.311.2.1.4" to "1.2.840.113549.1.7.1" pkcs7der.value[1].value[0].value[2].value[0].value = forge.asn1.oidToDer(forge.pki.oids.data).data; // Decode the PKCS7 message var pkcs7 = null, pkcs7content = null; try { pkcs7 = p7.messageFromAsn1(pkcs7der); pkcs7content = pkcs7.rawCapture.content.value[0]; } catch (ex) { } if ((pkcs7 == null) || (pkcs7content == null)) { // Can't decode the signature obj.header.sigpos = 0; obj.header.siglen = 0; obj.header.signed = false; } else { // Verify a PKCS#7 signature // Verify is not currently supported in node-forge, but if implemented in the future, this code could work. //var caStore = forge.pki.createCaStore(); //for (var i in obj.certificates) { caStore.addCertificate(obj.certificates[i]); } // Return is true if all signatures are valid and chain up to a provided CA //if (!pkcs7.verify(caStore)) { throw ('Executable file has an invalid signature.'); } // Get the signing attributes obj.signingAttribs = []; try { for (var i in pkcs7.rawCapture.authenticatedAttributes) { if ( (pkcs7.rawCapture.authenticatedAttributes[i].value != null) && (pkcs7.rawCapture.authenticatedAttributes[i].value[0] != null) && (pkcs7.rawCapture.authenticatedAttributes[i].value[0].value != null) && (pkcs7.rawCapture.authenticatedAttributes[i].value[1] != null) && (pkcs7.rawCapture.authenticatedAttributes[i].value[1].value != null) && (pkcs7.rawCapture.authenticatedAttributes[i].value[1].value[0] != null) && (pkcs7.rawCapture.authenticatedAttributes[i].value[1].value[0].value != null) && (forge.asn1.derToOid(pkcs7.rawCapture.authenticatedAttributes[i].value[0].value) == obj.Oids.SPC_SP_OPUS_INFO_OBJID)) { for (var j in pkcs7.rawCapture.authenticatedAttributes[i].value[1].value[0].value) { if ( (pkcs7.rawCapture.authenticatedAttributes[i].value[1].value[0].value[j] != null) && (pkcs7.rawCapture.authenticatedAttributes[i].value[1].value[0].value[j].value != null) && (pkcs7.rawCapture.authenticatedAttributes[i].value[1].value[0].value[j].value[0] != null) && (pkcs7.rawCapture.authenticatedAttributes[i].value[1].value[0].value[j].value[0].value != null) ) { var v = pkcs7.rawCapture.authenticatedAttributes[i].value[1].value[0].value[j].value[0].value; if (v.startsWith('http://') || v.startsWith('https://') || ((v.length % 2) == 1)) { obj.signingAttribs.push(v); } else { var r = ''; // This string value is in UCS2 format, convert it to a normal string. for (var k = 0; k < v.length; k += 2) { r += String.fromCharCode((v.charCodeAt(k + 8) << 8) + v.charCodeAt(k + 1)); } obj.signingAttribs.push(r); } } } } } } catch (ex) { } // Set the certificate chain obj.certificates = pkcs7.certificates; // Set the signature obj.signature = Buffer.from(pkcs7.rawCapture.signature, 'binary'); // Get the file hashing algorithm var hashAlgoOid = forge.asn1.derToOid(pkcs7content.value[1].value[0].value[0].value); switch (hashAlgoOid) { case forge.pki.oids.sha256: { obj.fileHashAlgo = 'sha256'; break; } case forge.pki.oids.sha384: { obj.fileHashAlgo = 'sha384'; break; } case forge.pki.oids.sha512: { obj.fileHashAlgo = 'sha512'; break; } case forge.pki.oids.sha224: { obj.fileHashAlgo = 'sha224'; break; } case forge.pki.oids.md5: { obj.fileHashAlgo = 'md5'; break; } } // Get the signed file hash obj.fileHashSigned = Buffer.from(pkcs7content.value[1].value[1].value, 'binary') // Compute the actual file hash if (obj.fileHashAlgo != null) { obj.fileHashActual = obj.getHash(obj.fileHashAlgo); } } } } return true; } // Make a timestamp signature request obj.timeStampRequest = function (args, func) { // Create the timestamp request in DER format const asn1 = forge.asn1; const pkcs7dataOid = asn1.oidToDer('1.2.840.113549.1.7.1').data; const microsoftCodeSigningOid = asn1.oidToDer('1.3.6.1.4.1.311.3.2.1').data; const asn1obj = asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [ asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OID, false, microsoftCodeSigningOid), asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [ asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OID, false, pkcs7dataOid), asn1.create(asn1.Class.CONTEXT_SPECIFIC, 0, true, [ asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OCTETSTRING, false, obj.signature.toString('binary')) // Signature here ]) ]) ]); // Serialize an ASN.1 object to DER format in Base64 const requestBody = Buffer.from(asn1.toDer(asn1obj).data, 'binary').toString('base64'); // Make an HTTP request const options = { url: args.time, proxy: args.proxy }; // Make a request to the time server httpRequest(options, requestBody, function (err, data) { if (err != null) { func(err); return; } // Decode the timestamp signature block var timepkcs7der = null; try { timepkcs7der = forge.asn1.fromDer(forge.util.createBuffer(Buffer.from(data, 'base64').toString('binary'))); } catch (ex) { func("Unable to parse time-stamp response: " + ex); return; } // Decode the executable signature block var pkcs7der = null; try { var pkcs7der = forge.asn1.fromDer(forge.util.createBuffer(Buffer.from(obj.getRawSignatureBlock(), 'base64').toString('binary'))); // Get the ASN1 certificates used to sign the timestamp and add them to the certs in the PKCS7 of the executable // TODO: We could look to see if the certificate is already present in the executable const timeasn1Certs = timepkcs7der.value[1].value[0].value[3].value; for (var i in timeasn1Certs) { pkcs7der.value[1].value[0].value[3].value.push(timeasn1Certs[i]); } // Remove any existing time stamp signatures var newValues = []; for (var i in pkcs7der.value[1].value[0].value[4].value[0].value) { const j = pkcs7der.value[1].value[0].value[4].value[0].value[i]; if ((j.tagClass != 128) || (j.type != 1)) { newValues.push(j); } // If this is not a time stamp, add it to out new list. } pkcs7der.value[1].value[0].value[4].value[0].value = newValues; // Set the new list // Get the time signature and add it to the executables PKCS7 const timeasn1Signature = timepkcs7der.value[1].value[0].value[4]; const countersignatureOid = asn1.oidToDer('1.2.840.113549.1.9.6').data; const asn1obj2 = asn1.create(asn1.Class.CONTEXT_SPECIFIC, 1, true, [ asn1.create(asn1.Class.UNIVERSAL, asn1.Type.SEQUENCE, true, [ asn1.create(asn1.Class.UNIVERSAL, asn1.Type.OID, false, countersignatureOid), timeasn1Signature ]) ]); pkcs7der.value[1].value[0].value[4].value[0].value.push(asn1obj2); // Re-encode the executable signature block const p7signature = Buffer.from(forge.asn1.toDer(pkcs7der).data, 'binary'); // Open the output file var output = null; try { output = fs.openSync(args.out, 'w+'); } catch (ex) { } if (output == null) return false; var tmp, written = 0; var executableSize = obj.header.sigpos ? obj.header.sigpos : this.filesize; // Compute pre-header length and copy that to the new file var preHeaderLen = (obj.header.peHeaderLocation + 152 + (obj.header.pe32plus * 16)); var tmp = readFileSlice(written, preHeaderLen); fs.writeSync(output, tmp); written += tmp.length; // Quad Align the results, adding padding if necessary var len = executableSize + p7signature.length; var padding = (8 - ((len) % 8)) % 8; // Write the signature header var addresstable = Buffer.alloc(8); addresstable.writeUInt32LE(executableSize); addresstable.writeUInt32LE(8 + p7signature.length + padding, 4); fs.writeSync(output, addresstable); written += addresstable.length; // Copy the rest of the file until the start of the signature block while ((executableSize - written) > 0) { tmp = readFileSlice(written, Math.min(executableSize - written, 65536)); fs.writeSync(output, tmp); written += tmp.length; } // Write the signature block header and signature var win = Buffer.alloc(8); // WIN CERTIFICATE Structure win.writeUInt32LE(p7signature.length + padding + 8); // DWORD length win.writeUInt16LE(512, 4); // WORD revision win.writeUInt16LE(2, 6); // WORD type fs.writeSync(output, win); fs.writeSync(output, p7signature); if (padding > 0) { fs.writeSync(output, Buffer.alloc(padding, 0)); } written += (p7signature.length + padding + 8); // Compute the checksum and write it in the PE header checksum location var tmp = Buffer.alloc(4); tmp.writeUInt32LE(runChecksumOnFile(output, written, ((obj.header.peOptionalHeaderLocation + 64) / 4))); fs.writeSync(output, tmp, 0, 4, obj.header.peOptionalHeaderLocation + 64); // Close the file fs.closeSync(output); // Indicate we are done func(null); } catch (ex) { func('' + ex); return; } }); } // Read a resource table. // ptr: The pointer to the start of the resource section // offset: The offset start of the resource table to read function readResourceTable(ptr, offset) { var buf = readFileSlice(ptr + offset, 16); var r = {}; r.characteristics = buf.readUInt32LE(0); r.timeDateStamp = buf.readUInt32LE(4); r.majorVersion = buf.readUInt16LE(8); r.minorVersion = buf.readUInt16LE(10); var numberOfNamedEntries = buf.readUInt16LE(12); var numberOfIdEntries = buf.readUInt16LE(14); r.entries = []; var totalResources = numberOfNamedEntries + numberOfIdEntries; //console.log('readResourceTable', offset, 16 + (totalResources) * 8, offset + (16 + (totalResources) * 8)); for (var i = 0; i < totalResources; i++) { buf = readFileSlice(ptr + offset + 16 + (i * 8), 8); var resource = {}; resource.name = buf.readUInt32LE(0); var offsetToData = buf.readUInt32LE(4); if ((resource.name & 0x80000000) != 0) { var oname = resource.name; resource.name = readLenPrefixUnicodeString(ptr + (resource.name - 0x80000000)); //console.log('readResourceName', offset + (oname - 0x80000000), 2 + (resource.name.length * 2), offset + (oname - 0x80000000) + (2 + resource.name.length * 2), resource.name); } if ((offsetToData & 0x80000000) != 0) { resource.table = readResourceTable(ptr, offsetToData - 0x80000000); } else { resource.item = readResourceItem(ptr, offsetToData); } r.entries.push(resource); } return r; } // Read a resource item // ptr: The pointer to the start of the resource section // offset: The offset start of the resource item to read function readResourceItem(ptr, offset) { //console.log('readResourceItem', offset, 16, offset + 16); var buf = readFileSlice(ptr + offset, 16), r = {}; r.offsetToData = buf.readUInt32LE(0); r.size = buf.readUInt32LE(4); //console.log('readResourceData', r.offsetToData - obj.header.sections['.rsrc'].virtualAddr, r.size, r.offsetToData + r.size - obj.header.sections['.rsrc'].virtualAddr); r.codePage = buf.readUInt32LE(8); //r.reserved = buf.readUInt32LE(12); return r; } // Read a unicode stting that starts with the string length as the first byte. function readLenPrefixUnicodeString(ptr) { var nameLen = readFileSlice(ptr, 2).readUInt16LE(0); var buf = readFileSlice(ptr + 2, nameLen * 2), name = ''; for (var i = 0; i < nameLen; i++) { name += String.fromCharCode(buf.readUInt16LE(i * 2)); } return name; } // Generate a complete resource section and pad the section function generateResourceSection(resources) { // Call a resursive method the compute the size needed for each element const resSizes = { tables: 0, items: 0, names: 0, data: 0 }; getResourceSectionSize(resources, resSizes); // Pad the resource section & allocate the buffer const fileAlign = obj.header.peWindows.fileAlignment var resSizeTotal = resSizes.tables + resSizes.items + resSizes.names + resSizes.data; var resNoPadding = resSizeTotal + 4; // TODO: Not sure why this is off by 4 if ((resSizeTotal % fileAlign) != 0) { resSizeTotal += (fileAlign - (resSizeTotal % fileAlign)); } const resSectionBuffer = Buffer.alloc(resSizeTotal); // Write the resource section, calling a recursive method const resPointers = { tables: 0, items: resSizes.tables, names: resSizes.tables + resSizes.items, data: resSizes.tables + resSizes.items + resSizes.names }; createResourceSection(resources, resSectionBuffer, resPointers); //console.log('generateResourceSection', resPointers); // Done, return the result return { size: resNoPadding, data: resSectionBuffer }; } // Return the total size of a resource header, this is a recursive method function getResourceSectionSize(resources, sizes) { sizes.tables += (16 + (resources.entries.length * 8)); for (var i in resources.entries) { if (typeof resources.entries[i].name == 'string') { var dataSize = (2 + (resources.entries[i].name.length * 2)); if ((dataSize % 8) != 0) { dataSize += (8 - (dataSize % 8)); } sizes.names += dataSize; } if (resources.entries[i].table) { getResourceSectionSize(resources.entries[i].table, sizes); } else if (resources.entries[i].item) { sizes.items += 16; if (resources.entries[i].item.buffer) { sizes.data += resources.entries[i].item.buffer.length; } else { var dataSize = resources.entries[i].item.size; if ((dataSize % 8) != 0) { dataSize += (8 - (dataSize % 8)); } sizes.data += dataSize; } } } } // Write the resource section in the buffer, this is a recursive method function createResourceSection(resources, buf, resPointers) { var numberOfNamedEntries = 0, numberOfIdEntries = 0, ptr = resPointers.tables; //console.log('createResourceSection', resPointers, ptr); // Figure out how many items we have to save for (var i in resources.entries) { if (typeof resources.entries[i].name == 'string') { numberOfNamedEntries++; } else { numberOfIdEntries++; } } // Move the table pointer forward resPointers.tables += (16 + (8 * numberOfNamedEntries) + (8 * numberOfIdEntries)); // Write the table header buf.writeUInt32LE(resources.characteristics, ptr); buf.writeUInt32LE(resources.timeDateStamp, ptr + 4); buf.writeUInt16LE(resources.majorVersion, ptr + 8); buf.writeUInt16LE(resources.minorVersion, ptr + 10); buf.writeUInt16LE(numberOfNamedEntries, ptr + 12); buf.writeUInt16LE(numberOfIdEntries, ptr + 14); // For each table entry, write the entry for it for (var i in resources.entries) { // Write the name var name = resources.entries[i].name; if (typeof resources.entries[i].name == 'string') { // Set the pointer to the name name = resPointers.names + 0x80000000; // Write the name length, followed by the name string in unicode buf.writeUInt16LE(resources.entries[i].name.length, resPointers.names); for (var j = 0; j < resources.entries[i].name.length; j++) { buf.writeUInt16LE(resources.entries[i].name.charCodeAt(j), 2 + resPointers.names + (j * 2)); } // Move the names pointer forward, 8 byte align var dataSize = (2 + (resources.entries[i].name.length * 2)); if ((dataSize % 8) != 0) { dataSize += (8 - (dataSize % 8)); } resPointers.names += dataSize; } buf.writeUInt32LE(name, ptr + 16 + (i * 8)); // Write the data var data; if (resources.entries[i].table) { // This is a pointer to a table entry data = resPointers.tables + 0x80000000; createResourceSection(resources.entries[i].table, buf, resPointers); } else if (resources.entries[i].item) { // This is a pointer to a data entry data = resPointers.items; // Write the data var entrySize = 0; if (resources.entries[i].item.buffer) { // Write the data from given buffer resources.entries[i].item.buffer.copy(buf, resPointers.data, 0, resources.entries[i].item.buffer.length); entrySize = resources.entries[i].item.buffer.length; } else { // Write the data from original file const actualPtr = (resources.entries[i].item.offsetToData - obj.header.sections['.rsrc'].virtualAddr) + obj.header.sections['.rsrc'].rawAddr; const tmp = readFileSlice(actualPtr, resources.entries[i].item.size); tmp.copy(buf, resPointers.data, 0, tmp.length); entrySize = resources.entries[i].item.size;; } // Write the item entry buf.writeUInt32LE(resPointers.data + obj.header.sections['.rsrc'].virtualAddr, resPointers.items); // Write the pointer relative to the virtual address buf.writeUInt32LE(entrySize, resPointers.items + 4); buf.writeUInt32LE(resources.entries[i].item.codePage, resPointers.items + 8); buf.writeUInt32LE(resources.entries[i].item.reserved, resPointers.items + 12); // Move items pointers forward resPointers.items += 16; var dataSize = entrySize; if ((dataSize % 8) != 0) { dataSize += (8 - (dataSize % 8)); } resPointers.data += dataSize; } buf.writeUInt32LE(data, ptr + 20 + (i * 8)); } } // Convert a unicode buffer to a string function unicodeToString(buf) { var r = '', c; for (var i = 0; i < (buf.length / 2) ; i++) { c = buf.readUInt16LE(i * 2); if (c != 0) { r += String.fromCharCode(c); } else { return r; } } return r; } // Convert a string to a unicode buffer // Input is a string, a buffer to write to and the offset in the buffer (0 is default). function stringToUnicode(str, buf, offset) { if (offset == null) { offset = 0; } for (var i = 0; i < str.length; i++) { buf.writeInt16LE(str.charCodeAt(i), offset + (i * 2)); } } var resourceDefaultNames = { 'bitmaps': 2, 'icon': 3, 'dialogs': 5, 'iconGroups': 14, 'versionInfo': 16, 'configurationFiles': 24 } // Return the raw signature block buffer with padding removed obj.getRawSignatureBlock = function () { if ((obj.header.sigpos == 0) || (obj.header.siglen == 0)) return null; var pkcs7raw = readFileSlice(obj.header.sigpos + 8, obj.header.siglen - 8); var derlen = forge.asn1.getBerValueLength(forge.util.createBuffer(pkcs7raw.slice(1, 5))) + 4; if (derlen != pkcs7raw.length) { pkcs7raw = pkcs7raw.slice(0, derlen); } return pkcs7raw; } // Get bitmaps information from resource obj.getBitmapInfo = function () { const r = {}, ptr = obj.header.sections['.rsrc'].rawAddr; // Find and parse each icon const bitmaps = {} for (var i = 0; i < obj.resources.entries.length; i++) { if (obj.resources.entries[i].name == resourceDefaultNames.bitmaps) { for (var j = 0; j < obj.resources.entries[i].table.entries.length; j++) { const bitmapName = obj.resources.entries[i].table.entries[j].name; const offsetToData = obj.resources.entries[i].table.entries[j].table.entries[0].item.offsetToData; const size = obj.resources.entries[i].table.entries[j].table.entries[0].item.size; const actualPtr = (offsetToData - obj.header.sections['.rsrc'].virtualAddr) + ptr; bitmaps[bitmapName] = readFileSlice(actualPtr, size); } } } return bitmaps; } // Get icon information from resource obj.getIconInfo = function () { const r = {}, ptr = obj.header.sections['.rsrc'].rawAddr; // Find and parse each icon const icons = {} for (var i = 0; i < obj.resources.entries.length; i++) { if (obj.resources.entries[i].name == resourceDefaultNames.icon) { for (var j = 0; j < obj.resources.entries[i].table.entries.length; j++) { const iconName = obj.resources.entries[i].table.entries[j].name; const offsetToData = obj.resources.entries[i].table.entries[j].table.entries[0].item.offsetToData; const size = obj.resources.entries[i].table.entries[j].table.entries[0].item.size; const actualPtr = (offsetToData - obj.header.sections['.rsrc'].virtualAddr) + ptr; icons[iconName] = readFileSlice(actualPtr, size); } } } // Find and parse each icon group for (var i = 0; i < obj.resources.entries.length; i++) { if (obj.resources.entries[i].name == resourceDefaultNames.iconGroups) { for (var j = 0; j < obj.resources.entries[i].table.entries.length; j++) { const groupName = obj.resources.entries[i].table.entries[j].name; const offsetToData = obj.resources.entries[i].table.entries[j].table.entries[0].item.offsetToData; const size = obj.resources.entries[i].table.entries[j].table.entries[0].item.size; const actualPtr = (offsetToData - obj.header.sections['.rsrc'].virtualAddr) + ptr; const group = {}; const groupData = readFileSlice(actualPtr, size); // Parse NEWHEADER structure: https://docs.microsoft.com/en-us/windows/win32/menurc/newheader group.resType = groupData.readUInt16LE(2); group.resCount = groupData.readUInt16LE(4); // Parse many RESDIR structure: https://docs.microsoft.com/en-us/windows/win32/menurc/resdir group.icons = {}; for (var p = 6; p < size; p += 14) { var icon = {} icon.width = groupData[p]; icon.height = groupData[p + 1]; icon.colorCount = groupData[p + 2]; icon.planes = groupData.readUInt16LE(p + 4); icon.bitCount = groupData.readUInt16LE(p + 6); icon.bytesInRes = groupData.readUInt32LE(p + 8); icon.iconCursorId = groupData.readUInt16LE(p + 12); icon.icon = icons[icon.iconCursorId]; group.icons[icon.iconCursorId] = icon; } // Add an icon group r[groupName] = group; } } } return r; } // Set bitmap information obj.setBitmapInfo = function (bitmapInfo) { // Delete all bitmaps resources var resourcesEntries = []; for (var i = 0; i < obj.resources.entries.length; i++) { if (obj.resources.entries[i].name != resourceDefaultNames.bitmaps) { resourcesEntries.push(obj.resources.entries[i]); } } obj.resources.entries = resourcesEntries; // Add all bitmap entries const bitmapEntry = { name: resourceDefaultNames.bitmaps, table: { characteristics: 0, timeDateStamp: 0, majorVersion: 0, minorVersion: 0, entries: [] } }; for (var i in bitmapInfo) { var name = i; if (parseInt(i) == name) { name = parseInt(i); } const bitmapItemEntry = { name: name, table: { characteristics: 0, timeDateStamp: 0, majorVersion: 0, minorVersion: 0, entries: [{ name: 1033, item: { buffer: bitmapInfo[i], codePage: 0 } }] } } bitmapEntry.table.entries.push(bitmapItemEntry); } obj.resources.entries.push(bitmapEntry); // Sort the resources by name. This is required. function resSort(a, b) { if ((typeof a == 'string') && (typeof b == 'string')) { if (a < b) return -1; if (a > b) return 1; return 0; } if ((typeof a == 'number') && (typeof b == 'number')) { return a - b; } if ((typeof a == 'string') && (typeof b == 'number')) { return -1; } return 1; } const names = []; for (var i = 0; i < obj.resources.entries.length; i++) { names.push(obj.resources.entries[i].name); }