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tlstcp.go
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tlstcp.go
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// Copyright 2015 The Mangos Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use 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 tlstcp implements the TLS over TCP transport for mangos.
package tlstcp
import (
"crypto/tls"
"net"
"github.com/gdamore/mangos"
)
type options map[string]interface{}
func (o options) get(name string) (interface{}, error) {
if v, ok := o[name]; ok {
return v, nil
}
return nil, mangos.ErrBadOption
}
func (o options) set(name string, val interface{}) error {
switch name {
case mangos.OptionTlsConfig:
switch v := val.(type) {
case *tls.Config:
// Make a private copy
cfg := *v
// TLS versions prior to 1.2 are insecure/broken
cfg.MinVersion = tls.VersionTLS12
cfg.MaxVersion = tls.VersionTLS12
o[name] = &cfg
default:
return mangos.ErrBadValue
}
default:
return mangos.ErrBadOption
}
return nil
}
func (o options) configTCP(conn *net.TCPConn) error {
if v, ok := o[mangos.OptionNoDelay]; ok {
if err := conn.SetNoDelay(v.(bool)); err != nil {
return err
}
}
if v, ok := o[mangos.OptionKeepAlive]; ok {
if err := conn.SetKeepAlive(v.(bool)); err != nil {
return err
}
}
return nil
}
func newOptions(t *tlsTran) options {
o := make(map[string]interface{})
o[mangos.OptionTlsConfig] = t.config
return options(o)
}
type dialer struct {
addr *net.TCPAddr
proto mangos.Protocol
opts options
}
func (d *dialer) Dial() (mangos.Pipe, error) {
var config *tls.Config
tconn, err := net.DialTCP("tcp", nil, d.addr)
if err != nil {
return nil, err
}
if err = d.opts.configTCP(tconn); err != nil {
tconn.Close()
return nil, err
}
if v, ok := d.opts[mangos.OptionTlsConfig]; ok {
config = v.(*tls.Config)
}
conn := tls.Client(tconn, config)
return mangos.NewConnPipe(conn, d.proto,
mangos.PropTlsConnState, conn.ConnectionState())
}
func (d *dialer) SetOption(n string, v interface{}) error {
return d.opts.set(n, v)
}
func (d *dialer) GetOption(n string) (interface{}, error) {
return d.opts.get(n)
}
type listener struct {
proto mangos.Protocol
addr *net.TCPAddr
listener *net.TCPListener
opts options
config *tls.Config
}
func (l *listener) Listen() error {
var err error
if v, ok := l.opts[mangos.OptionTlsConfig]; !ok {
return mangos.ErrTlsNoConfig
} else {
l.config = v.(*tls.Config)
}
if l.config == nil {
return mangos.ErrTlsNoConfig
}
if l.config.Certificates == nil || len(l.config.Certificates) == 0 {
return mangos.ErrTlsNoCert
}
if l.listener, err = net.ListenTCP("tcp", l.addr); err != nil {
return err
}
return nil
}
func (l *listener) Accept() (mangos.Pipe, error) {
conn, err := l.listener.AcceptTCP()
if err != nil {
return nil, err
}
if err = l.opts.configTCP(conn); err != nil {
conn.Close()
return nil, err
}
return mangos.NewConnPipe(tls.Server(conn, l.config), l.proto)
}
func (l *listener) Close() error {
l.listener.Close()
return nil
}
func (l *listener) SetOption(n string, v interface{}) error {
return l.opts.set(n, v)
}
func (l *listener) GetOption(n string) (interface{}, error) {
return l.opts.get(n)
}
type tlsTran struct {
config *tls.Config
localAddr net.Addr
}
func (t *tlsTran) Scheme() string {
return "tls+tcp"
}
func (t *tlsTran) NewDialer(addr string, proto mangos.Protocol) (mangos.PipeDialer, error) {
var err error
if addr, err = mangos.StripScheme(t, addr); err != nil {
return nil, err
}
d := &dialer{proto: proto, opts: newOptions(t)}
if d.addr, err = net.ResolveTCPAddr("tcp", addr); err != nil {
return nil, err
}
return d, nil
}
// NewAccepter implements the Transport NewAccepter method.
func (t *tlsTran) NewListener(addr string, proto mangos.Protocol) (mangos.PipeListener, error) {
var err error
l := &listener{proto: proto, opts: newOptions(t)}
if addr, err = mangos.StripScheme(t, addr); err != nil {
return nil, err
}
if l.addr, err = net.ResolveTCPAddr("tcp", addr); err != nil {
return nil, err
}
return l, nil
}
// NewTransport allocates a new inproc transport.
func NewTransport() mangos.Transport {
return &tlsTran{}
}