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tls.go
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tls.go
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// Copyright 2014 The Cockroach Authors.
//
// 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. See the AUTHORS file
// for names of contributors.
//
// Author: jqmp (jaqueramaphan@gmail.com)
package rpc
// TODO(jqmp): The use of TLS here is just a proof of concept; its security
// properties haven't been analyzed or audited.
import (
"bufio"
"crypto/tls"
"io"
"net"
"net/http"
"net/rpc"
"github.com/cockroachdb/cockroach/util"
"github.com/cockroachdb/cockroach/util/log"
)
// tlsListen wraps either net.Listen or crypto/tls.Listen, depending on the contents of
// the passed TLS Config.
func tlsListen(network, address string, config *tls.Config) (net.Listener, error) {
if config == nil {
if network != "unix" {
log.Warningf("listening via %s to %s without TLS", network, address)
}
return net.Listen(network, address)
}
return tls.Listen(network, address, config)
}
// tlsDial wraps either net.Dial or crypto/tls.Dial, depending on the contents of
// the passed TLS Config.
func tlsDial(network, address string, config *tls.Config) (net.Conn, error) {
if config == nil {
if network != "unix" {
log.Warningf("connecting via %s to %s without TLS", network, address)
}
return net.Dial(network, address)
}
return tls.Dial(network, address, config)
}
// tlsDialHTTP connects to an HTTP RPC server at the specified address.
func tlsDialHTTP(network, address string, config *tls.Config) (net.Conn, error) {
conn, err := tlsDial(network, address, config)
if err != nil {
return conn, err
}
// Note: this code was adapted from net/rpc.DialHTTPPath.
io.WriteString(conn, "CONNECT "+rpc.DefaultRPCPath+" HTTP/1.0\n\n")
// Require successful HTTP response before switching to RPC protocol.
resp, err := http.ReadResponse(bufio.NewReader(conn), &http.Request{Method: "CONNECT"})
if err == nil && resp.Status == connected {
return conn, nil
}
if err == nil {
err = util.Errorf("unexpected HTTP response: %s", resp.Status)
}
conn.Close()
return nil, err
}