forked from ghostunnel/ghostunnel
/
dialer.go
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/
dialer.go
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/*-
* Copyright 2018 Square Inc.
*
* 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 certloader
import (
"crypto/tls"
"net"
"time"
)
type timeoutError struct{}
func (timeoutError) Error() string { return "tls: DialWithDialer timed out" }
func (timeoutError) Timeout() bool { return true }
func (timeoutError) Temporary() bool { return true }
// Dialer is an interface for dialers. Can be a net.Dialer, http_dialer.HttpTunnel, or a dialer from this package.
type Dialer interface {
Dial(network, address string) (net.Conn, error)
}
type mtlsDialer struct {
cert Certificate
config *tls.Config
timeout time.Duration
dialer Dialer
}
// DialerWithCertificate creates a dialer that reloads its certificate (if set) before dialing new connections.
// If the certificate is nil, the dialer will still work, but it won't supply client certificates on connections.
func DialerWithCertificate(cert Certificate, config *tls.Config, timeout time.Duration, dialer Dialer) Dialer {
d := mtlsDialer{
cert: cert,
config: config,
timeout: timeout,
dialer: dialer,
}
if cert != nil && config.GetClientCertificate == nil {
config.GetClientCertificate = cert.GetClientCertificate
}
return &d
}
func (d *mtlsDialer) Dial(network, address string) (net.Conn, error) {
return dialWithDialer(d.dialer, d.timeout, network, address, d.config)
}
// Internal copy of tls.DialWithDialer, adapted so it can work with HTTP CONNECT dialers.
// See https://golang.org/pkg/crypto/tls/#DialWithDialer for original implementation.
func dialWithDialer(dialer Dialer, timeout time.Duration, network, addr string, config *tls.Config) (*tls.Conn, error) {
errChannel := make(chan error, 2)
time.AfterFunc(timeout, func() {
errChannel <- timeoutError{}
})
rawConn, err := dialer.Dial(network, addr)
if err != nil {
return nil, err
}
conn := tls.Client(rawConn, config)
go func() {
errChannel <- conn.Handshake()
}()
err = <-errChannel
if err != nil {
rawConn.Close()
return nil, err
}
return conn, nil
}