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Implement certificate compression (#95)

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Certificate compression is defined in RFC 8879:
https://datatracker.ietf.org/doc/html/rfc8879

This implementation is client-side only, for server certificates.

- Fixes #104.
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hwh33 2022-07-19 19:12:30 -06:00 • committed by GitHub
parent 9d36ce3658
commit 7344e34650
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11 changed files with 276 additions and 50 deletions
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17
u_fingerprinter.go
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@ -303,7 +303,22 @@ func (f *Fingerprinter) FingerprintClientHello(data []byte) (*ClientHelloSpec, e
case utlsExtensionPadding:
clientHelloSpec.Extensions = append(clientHelloSpec.Extensions, &UtlsPaddingExtension{GetPaddingLen: BoringPaddingStyle})
case fakeExtensionChannelID, fakeCertCompressionAlgs, fakeRecordSizeLimit:
case utlsExtensionCompressCertificate:
methods := []CertCompressionAlgo{}
methodsRaw := new(cryptobyte.String)
if !extData.ReadUint8LengthPrefixed(methodsRaw) {
return nil, errors.New("unable to read cert compression algorithms extension data")
}
for !methodsRaw.Empty() {
var method uint16
if !methodsRaw.ReadUint16(&method) {
return nil, errors.New("unable to read cert compression algorithms extension data")
}
methods = append(methods, CertCompressionAlgo(method))
}
clientHelloSpec.Extensions = append(clientHelloSpec.Extensions, &UtlsCompressCertExtension{methods})
case fakeExtensionChannelID, fakeRecordSizeLimit:
clientHelloSpec.Extensions = append(clientHelloSpec.Extensions, &GenericExtension{extension, extData})
case extensionPreSharedKey: