frp/pkg/util/vhost/https.go

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// Copyright 2016 fatedier, fatedier@gmail.com
//
// 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 vhost
import (
"crypto/tls"
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"io"
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"net"
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"time"
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libnet "github.com/fatedier/golib/net"
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)
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type HTTPSMuxer struct {
*Muxer
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}
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func NewHTTPSMuxer(listener net.Listener, timeout time.Duration) (*HTTPSMuxer, error) {
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mux, err := NewMuxer(listener, GetHTTPSHostname, timeout)
if err != nil {
return nil, err
}
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return &HTTPSMuxer{mux}, err
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}
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func GetHTTPSHostname(c net.Conn) (_ net.Conn, _ map[string]string, err error) {
reqInfoMap := make(map[string]string, 0)
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sc, rd := libnet.NewSharedConn(c)
clientHello, err := readClientHello(rd)
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if err != nil {
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return nil, reqInfoMap, err
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}
reqInfoMap["Host"] = clientHello.ServerName
reqInfoMap["Scheme"] = "https"
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return sc, reqInfoMap, nil
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}
func readClientHello(reader io.Reader) (*tls.ClientHelloInfo, error) {
var hello *tls.ClientHelloInfo
// Note that Handshake always fails because the readOnlyConn is not a real connection.
// As long as the Client Hello is successfully read, the failure should only happen after GetConfigForClient is called,
// so we only care about the error if hello was never set.
err := tls.Server(readOnlyConn{reader: reader}, &tls.Config{
GetConfigForClient: func(argHello *tls.ClientHelloInfo) (*tls.Config, error) {
hello = &tls.ClientHelloInfo{}
*hello = *argHello
return nil, nil
},
}).Handshake()
if hello == nil {
return nil, err
}
return hello, nil
}
type readOnlyConn struct {
reader io.Reader
}
func (conn readOnlyConn) Read(p []byte) (int, error) { return conn.reader.Read(p) }
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func (conn readOnlyConn) Write(_ []byte) (int, error) { return 0, io.ErrClosedPipe }
func (conn readOnlyConn) Close() error { return nil }
func (conn readOnlyConn) LocalAddr() net.Addr { return nil }
func (conn readOnlyConn) RemoteAddr() net.Addr { return nil }
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func (conn readOnlyConn) SetDeadline(_ time.Time) error { return nil }
func (conn readOnlyConn) SetReadDeadline(_ time.Time) error { return nil }
func (conn readOnlyConn) SetWriteDeadline(_ time.Time) error { return nil }