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Implement FingerprintClientHello to generate ClientHelloSpec from ClientHello raw bytes (#67)

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maxb 2020-12-09 21:37:06 -08:00 • committed by GitHub
parent f7e7360167
commit 2179f28668
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10 changed files with 1652 additions and 159 deletions
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10
u_parrots.go
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@ -617,6 +617,9 @@ func (uconn *UConn) ApplyPreset(p *ClientHelloSpec) error {
uconn.Extensions = make([]TLSExtension, len(p.Extensions))
copy(uconn.Extensions, p.Extensions)
// Check whether NPN extension actually exists
var haveNPN bool
// reGrease, and point things to each other
for _, e := range uconn.Extensions {
switch ext := e.(type) {
@ -681,8 +684,15 @@ func (uconn *UConn) ApplyPreset(p *ClientHelloSpec) error {
ext.Versions[i] = GetBoringGREASEValue(uconn.greaseSeed, ssl_grease_version)
}
}
case *NPNExtension:
haveNPN = true
}
}
// The default golang behavior in makeClientHello always sets NextProtoNeg if NextProtos is set,
// but NextProtos is also used by ALPN and our spec nmay not actually have a NPN extension
hello.NextProtoNeg = haveNPN
return nil
}