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clienthello.go
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clienthello.go
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// Copyright 2020 Matthew Holt
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package l4tls
import (
"crypto/tls"
)
// ClientHelloInfo holds information about a TLS ClientHello.
// Our own parser collects a little more information than
// the standard library's struct holds.
type ClientHelloInfo struct {
tls.ClientHelloInfo
Version uint16
Random []byte
SessionID []byte
SecureRenegotiationSupported bool
SecureRenegotiation []byte
CompressionMethods []byte
Extensions []uint16
OCSPStapling bool
TicketSupported bool
SessionTicket []uint8
SupportedSchemesCert []tls.SignatureScheme
SCTs bool
Cookie []byte
KeyShares []KeyShare
EarlyData bool
PSKModes []uint8
PSKIdentities []PSKIdentity
PSKBinders [][]byte
}
// FillTLSClientConfig fills cfg (a client-side TLS config) with information
// from chi. It does not overwrite any fields in cfg that are already non-zero.
func (chi ClientHelloInfo) FillTLSClientConfig(cfg *tls.Config) {
if cfg.NextProtos == nil {
cfg.NextProtos = chi.ClientHelloInfo.SupportedProtos
}
if cfg.ServerName == "" {
cfg.ServerName = chi.ClientHelloInfo.ServerName
}
if cfg.CipherSuites == nil {
cfg.CipherSuites = chi.ClientHelloInfo.CipherSuites
}
if cfg.CurvePreferences == nil {
cfg.CurvePreferences = chi.ClientHelloInfo.SupportedCurves
}
var minVer, maxVer uint16
for _, ver := range chi.ClientHelloInfo.SupportedVersions {
if minVer == 0 || ver < minVer {
minVer = ver
}
if maxVer == 0 || ver > maxVer {
maxVer = ver
}
}
if cfg.MinVersion == 0 {
cfg.MinVersion = minVer
}
if cfg.MaxVersion == 0 {
cfg.MaxVersion = maxVer
}
}