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Add randomized clientHello generation in UTLSIdToSpec. (#155)

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Co-authored-by: f.gruzdev <f.gruzdev@sellematics.com>
This commit is contained in:
fedosgad 2023-02-04 08:58:25 +03:00 • committed by GitHub
parent 186c87f6cc
commit 5eb62ee120
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 21 additions and 11 deletions
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32
u_parrots.go
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@ -1844,6 +1844,9 @@ func utlsIdToSpec(id ClientHelloID) (ClientHelloSpec, error) {
},
},
}, nil
case HelloRandomized, HelloRandomizedALPN, HelloRandomizedNoALPN:
// Use empty values as they can be filled later by UConn.ApplyPreset or manually.
return generateRandomizedSpec(id, "", nil, nil)
default:
return ClientHelloSpec{}, errors.New("ClientHello ID " + id.Str() + " is unknown")
}
@ -2072,23 +2075,30 @@ func (uconn *UConn) ApplyPreset(p *ClientHelloSpec) error {
}
func (uconn *UConn) generateRandomizedSpec() (ClientHelloSpec, error) {
return generateRandomizedSpec(uconn.ClientHelloID, uconn.serverName, uconn.HandshakeState.Session, uconn.config.NextProtos)
}
func generateRandomizedSpec(
id ClientHelloID,
serverName string,
session *ClientSessionState,
nextProtos []string,
) (ClientHelloSpec, error) {
p := ClientHelloSpec{}
if uconn.ClientHelloID.Seed == nil {
if id.Seed == nil {
seed, err := NewPRNGSeed()
if err != nil {
return p, err
}
uconn.ClientHelloID.Seed = seed
id.Seed = seed
}
r, err := newPRNGWithSeed(uconn.ClientHelloID.Seed)
r, err := newPRNGWithSeed(id.Seed)
if err != nil {
return p, err
}
id := uconn.ClientHelloID
var WithALPN bool
switch id.Client {
case helloRandomizedALPN:
@ -2132,8 +2142,8 @@ func (uconn *UConn) generateRandomizedSpec() (ClientHelloSpec, error) {
p.CipherSuites = removeRandomCiphers(r, shuffledSuites, 0.4)
sni := SNIExtension{uconn.config.ServerName}
sessionTicket := SessionTicketExtension{Session: uconn.HandshakeState.Session}
sni := SNIExtension{serverName}
sessionTicket := SessionTicketExtension{Session: session}
sigAndHashAlgos := []SignatureScheme{
ECDSAWithP256AndSHA256,
@ -2193,11 +2203,11 @@ func (uconn *UConn) generateRandomizedSpec() (ClientHelloSpec, error) {
}
if WithALPN {
if len(uconn.config.NextProtos) == 0 {
if len(nextProtos) == 0 {
// if user didn't specify alpn yet, choose something popular
uconn.config.NextProtos = []string{"h2", "http/1.1"}
nextProtos = []string{"h2", "http/1.1"}
}
alpn := ALPNExtension{AlpnProtocols: uconn.config.NextProtos}
alpn := ALPNExtension{AlpnProtocols: nextProtos}
p.Extensions = append(p.Extensions, &alpn)
}
@ -2245,7 +2255,7 @@ func (uconn *UConn) generateRandomizedSpec() (ClientHelloSpec, error) {
// seed to create a new, independent PRNG, so that a seed used
// with the previous version of generateRandomizedSpec will
// produce the exact same spec as long as ALPS isn't selected.
r, err := newPRNGWithSaltedSeed(uconn.ClientHelloID.Seed, "ALPS")
r, err := newPRNGWithSaltedSeed(id.Seed, "ALPS")
if err != nil {
return p, err
}