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More authenticode work, PKCS7 decode and encode.

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Ylian Saint-Hilaire 2022-05-27 00:26:01 -07:00
parent 30edbdb717
commit 549b67555f
1 changed files with 24 additions and 24 deletions
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48
authenticode.js
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@ -94,6 +94,8 @@ function createAuthenticodeHandler(path) {
var derlen = forge.asn1.getBerValueLength(forge.util.createBuffer(pkcs7raw.slice(1, 5))) + 4; var derlen = forge.asn1.getBerValueLength(forge.util.createBuffer(pkcs7raw.slice(1, 5))) + 4;
if (derlen != pkcs7raw.length) { pkcs7raw = pkcs7raw.slice(0, derlen); } if (derlen != pkcs7raw.length) { pkcs7raw = pkcs7raw.slice(0, derlen); }
//console.log('pkcs7raw', pkcs7raw.toString('base64'));
// Decode the signature block // Decode the signature block
var pkcs7der = forge.asn1.fromDer(forge.util.createBuffer(pkcs7raw)); var pkcs7der = forge.asn1.fromDer(forge.util.createBuffer(pkcs7raw));
@ -107,11 +109,12 @@ function createAuthenticodeHandler(path) {
pkcs7der.value[1].value[0].value[2].value[1].value[0] = { tagClass: 0, type: 4, constructed: false, composed: false, value: pkcs7content }; pkcs7der.value[1].value[0].value[2].value[1].value[0] = { tagClass: 0, type: 4, constructed: false, composed: false, value: pkcs7content };
// DEBUG: Print out the new DER // DEBUG: Print out the new DER
//console.log(Buffer.from(forge.asn1.toDer(pkcs7der).data, 'binary').toString('hex')); //console.log(Buffer.from(forge.asn1.toDer(pkcs7der).data, 'binary').toString('base64'));
// Decode the PKCS7 message // Decode the PKCS7 message
var pkcs7 = p7.messageFromAsn1(pkcs7der); var pkcs7 = p7.messageFromAsn1(pkcs7der);
var pkcs7content = forge.asn1.fromDer(pkcs7.rawCapture.content.value[0].value); var pkcs7content = forge.asn1.fromDer(pkcs7.rawCapture.content.value[0].value);
obj.rawSignedContent = pkcs7.rawCapture.content.value[0].value;
//console.log('p7content', JSON.stringify(pkcs7content)); //console.log('p7content', JSON.stringify(pkcs7content));
@ -183,8 +186,7 @@ function createAuthenticodeHandler(path) {
if ((cert == null) || (key == null)) { var c = obj.createSelfSignedCert(); cert = c.cert; key = c.key; } if ((cert == null) || (key == null)) { var c = obj.createSelfSignedCert(); cert = c.cert; key = c.key; }
var fileHash = getHash('sha384'); var fileHash = getHash('sha384');
var p7 = forge.pkcs7.createSignedData(); var p7 = forge.pkcs7.createSignedData();
p7.content = forge.util.createBuffer(fileHash, 'utf8'); // DEBUG: NOT CORRRECT p7.content = forge.asn1.toDer({ "tagClass": 0, "type": 16, "constructed": true, "composed": true, "value": [{ "tagClass": 0, "type": 16, "constructed": true, "composed": true, "value": [{ "tagClass": 0, "type": 6, "constructed": false, "composed": false, "value": forge.asn1.oidToDer("1.3.6.1.4.1.311.2.1.15").data }, { "tagClass": 0, "type": 16, "constructed": true, "composed": true, "value": [{ "tagClass": 0, "type": 3, "constructed": false, "composed": false, "value": "\u0000", "bitStringContents": "\u0000", "original": { "tagClass": 0, "type": 3, "constructed": false, "composed": false, "value": "\u0000" } }, { "tagClass": 128, "type": 0, "constructed": true, "composed": true, "value": [{ "tagClass": 128, "type": 2, "constructed": true, "composed": true, "value": [{ "tagClass": 128, "type": 0, "constructed": false, "composed": false, "value": "" }] }] }] }] }, { "tagClass": 0, "type": 16, "constructed": true, "composed": true, "value": [{ "tagClass": 0, "type": 16, "constructed": true, "composed": true, "value": [{ "tagClass": 0, "type": 6, "constructed": false, "composed": false, "value": forge.asn1.oidToDer(forge.pki.oids.sha384).data }, { "tagClass": 0, "type": 5, "constructed": false, "composed": false, "value": "" }] }, { "tagClass": 0, "type": 4, "constructed": false, "composed": false, "value": fileHash.toString('binary') }] }] });
//p7.content = { "tagClass": 0, "type": 16, "constructed": true, "composed": true, "value": [{ "tagClass": 0, "type": 16, "constructed": true, "composed": true, "value": [{ "tagClass": 0, "type": 6, "constructed": false, "composed": false, "value": forge.asn1.oidToDer("1.3.6.1.4.1.311.2.1.15") }, { "tagClass": 0, "type": 16, "constructed": true, "composed": true, "value": [{ "tagClass": 0, "type": 3, "constructed": false, "composed": false, "value": "\u0000", "bitStringContents": "\u0000", "original": { "tagClass": 0, "type": 3, "constructed": false, "composed": false, "value": "\u0000" } }, { "tagClass": 128, "type": 0, "constructed": true, "composed": true, "value": [{ "tagClass": 128, "type": 2, "constructed": true, "composed": true, "value": [{ "tagClass": 128, "type": 0, "constructed": false, "composed": false, "value": "" }] }] }] }] }, { "tagClass": 0, "type": 16, "constructed": true, "composed": true, "value": [{ "tagClass": 0, "type": 16, "constructed": true, "composed": true, "value": [{ "tagClass": 0, "type": 6, "constructed": false, "composed": false, "value": forge.asn1.oidToDer(forge.pki.oids.sha384).data }, { "tagClass": 0, "type": 5, "constructed": false, "composed": false, "value": "" }] }, { "tagClass": 0, "type": 4, "constructed": false, "composed": false, "value": fileHash.toString('binary') }] }] };
p7.addCertificate(cert); p7.addCertificate(cert);
p7.addSigner({ p7.addSigner({
key: key, key: key,
@ -192,27 +194,27 @@ function createAuthenticodeHandler(path) {
digestAlgorithm: forge.pki.oids.sha384, digestAlgorithm: forge.pki.oids.sha384,
authenticatedAttributes: authenticatedAttributes:
[ [
{ { type: obj.Oids.SPC_INDIRECT_DATA_OBJID, },
type: obj.Oids.SPC_INDIRECT_DATA_OBJID, { type: forge.pki.oids.contentType, value: forge.pki.oids.data },
}, { type: forge.pki.oids.messageDigest }, // value will be auto-populated at signing time
{ { type: forge.pki.oids.signingTime, value: new Date() } // value can also be auto-populated at signing time
type: forge.pki.oids.contentType,
value: forge.pki.oids.data
},
{
type: forge.pki.oids.messageDigest
// value will be auto-populated at signing time
},
{
type: forge.pki.oids.signingTime,
// value can also be auto-populated at signing time
value: new Date()
}
] ]
}); });
p7.sign(); p7.sign();
var p7signature = Buffer.from(forge.pkcs7.messageToPem(p7).split('-----BEGIN PKCS7-----')[1].split('-----END PKCS7-----')[0], 'base64'); var p7signature = Buffer.from(forge.pkcs7.messageToPem(p7).split('-----BEGIN PKCS7-----')[1].split('-----END PKCS7-----')[0], 'base64');
console.log('p7signature', p7signature.toString('base64'));
// Correct the signed data type
// Decode the signature block
var pkcs7der = forge.asn1.fromDer(forge.util.createBuffer(p7signature.toString('binary')));
// To work around ForgeJS PKCS#7 limitation
// Switch content type from 1.2.840.113549.1.7.1 to forge.pki.oids.data (1.3.6.1.4.1.311.2.1.4)
pkcs7der.value[1].value[0].value[2].value[0].value = forge.asn1.oidToDer('1.3.6.1.4.1.311.2.1.4').data;
// Convert the ASN1 content data into binary and place back
var pkcs7content = forge.asn1.fromDer(forge.util.createBuffer(Buffer.from(pkcs7der.value[1].value[0].value[2].value[1].value[0].value, 'binary').toString('binary')));
pkcs7der.value[1].value[0].value[2].value[1].value = [ pkcs7content ];
p7signature = Buffer.from(forge.asn1.toDer(pkcs7der).data, 'binary');
// Create the output filename // Create the output filename
var outputFileName = this.path.split('.'); var outputFileName = this.path.split('.');
@ -236,8 +238,6 @@ function createAuthenticodeHandler(path) {
// Write the signature header // Write the signature header
var addresstable = Buffer.alloc(8); var addresstable = Buffer.alloc(8);
console.log('executableSize', executableSize);
console.log('signLength', p7signature.length, padding);
addresstable.writeUInt32LE(executableSize); addresstable.writeUInt32LE(executableSize);
addresstable.writeUInt32LE(8 + p7signature.length + padding, 4); addresstable.writeUInt32LE(8 + p7signature.length + padding, 4);
fs.writeSync(output, addresstable); fs.writeSync(output, addresstable);
@ -338,10 +338,10 @@ function start() {
console.log('FileLen: ' + exe.filesize); console.log('FileLen: ' + exe.filesize);
} }
if (command == 'sign') { if (command == 'sign') {
console.log('Signing...'); exe.sign(); console.log('Signing...'); exe.sign(); console.log('Done.');
} }
if (command == 'unsign') { if (command == 'unsign') {
if (exe.header.signed) { console.log('Unsigning...'); exe.unsign(); } else { console.log('Executable is not signed.'); } if (exe.header.signed) { console.log('Unsigning...'); exe.unsign(); console.log('Done.'); } else { console.log('Executable is not signed.'); }
} }
// Close the file // Close the file