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Code Issues Releases Wiki Activity

Fixed authenticode padding.

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This commit is contained in:
Ylian Saint-Hilaire 2022-05-26 10:32:50 -07:00
parent 21b3566214
commit c76aa4dd03
1 changed files with 16 additions and 19 deletions
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33
authenticode.js
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@ -83,20 +83,15 @@ function createAuthenticodeHandler(path) {
obj.header.siglen = buf.readUInt32LE(4);
obj.header.signed = ((obj.header.sigpos != 0) && (obj.header.siglen != 0));
if (obj.header.signed)
{
if (obj.header.signed) {
// Read signature block
// Check the last 8 bytes for padding (Quad-Aligned), and remove it
var pkcs7raw = readFileSlice(obj.header.sigpos + 8, obj.header.siglen - 8);
var i;
for (i = 0; i < 8 && pkcs7raw[pkcs7raw.length - 1 - i] == 0; ++i)
{
}
if (i > 0)
{
pkcs7raw = pkcs7raw.slice(0, pkcs7raw.length - i);
}
// 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
var pkcs7der = forge.asn1.fromDer(forge.util.createBuffer(pkcs7raw));
// To work around ForgeJS PKCS#7 limitation
@ -161,8 +156,8 @@ function createAuthenticodeHandler(path) {
cert.validity.notAfter = new Date();
cert.validity.notAfter.setFullYear(cert.validity.notBefore.getFullYear() + 3);
var attrs = [
{ name: 'commonName', value: 'example.org' },
{ name: 'countryName', value: 'US' },
{ name: 'commonName', value: 'example.org' },
{ name: 'countryName', value: 'US' },
{ shortName: 'ST', value: 'California' },
{ name: 'localityName', value: 'Santa Clara' },
{ name: 'organizationName', value: 'Test' },
@ -210,9 +205,9 @@ function createAuthenticodeHandler(path) {
var p7signature = Buffer.from(forge.pkcs7.messageToPem(p7).split('-----BEGIN PKCS7-----')[1].split('-----END PKCS7-----')[0], 'base64');
console.log('p7signature', p7signature.toString('base64'));
// Quad Align the results, adding padding if necessary
var len = this.filesize + p7signature.length;
var padding = (8 - ((len) % 8)) % 8; // Quad Align the results, adding padding if necessary
var padding = (8 - ((len) % 8)) % 8;
var addresstable = Buffer.alloc(8);
addresstable.writeUInt32LE(this.filesize);
@ -226,13 +221,15 @@ function createAuthenticodeHandler(path) {
var bytesLeft = this.filesize;
var tmp;
while ((this.filesize - written) > 0)
{
// TODO: This copies the entire file including the old signature block.
// Need to be fixed to only copy the file without the signature block
while ((this.filesize - written) > 0) {
tmp = readFileSlice(written, (this.filesize - written) > 65535 ? 65535 : this.filesize - written);
fs.writeSync(output, tmp);
written += tmp.length;
}
// Write the signature block
var win = Buffer.alloc(8); // WIN CERTIFICATE Structure
win.writeUInt32LE(p7signature.length + padding + 8); // DWORD length
win.writeUInt16LE(512, 4); // WORD revision