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// Copyright (C) 2017. See 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.
package openssl
import (
"errors"
"net"
"runtime"
)
type listener struct {
net.Listener
ctx *Ctx
}
func (l *listener) Accept() (c net.Conn, err error) {
c, err = l.Listener.Accept()
if err != nil {
return nil, err
}
ssl_c, err := Server(c, l.ctx)
runtime.KeepAlive(l.ctx)
if err != nil {
c.Close()
return nil, err
}
return ssl_c, nil
}
// NewListener wraps an existing net.Listener such that all accepted
// connections are wrapped as OpenSSL server connections using the provided
// context ctx.
func NewListener(inner net.Listener, ctx *Ctx) net.Listener {
return &listener{
Listener: inner,
ctx: ctx}
}
// Listen is a wrapper around net.Listen that wraps incoming connections with
// an OpenSSL server connection using the provided context ctx.
func Listen(network, laddr string, ctx *Ctx) (net.Listener, error) {
if ctx == nil {
return nil, errors.New("no ssl context provided")
}
l, err := net.Listen(network, laddr)
if err != nil {
return nil, err
}
return NewListener(l, ctx), nil
}
type DialFlags int
const (
InsecureSkipHostVerification DialFlags = 1 << iota
DisableSNI
)
// Dial will connect to network/address and then wrap the corresponding
// underlying connection with an OpenSSL client connection using context ctx.
// If flags includes InsecureSkipHostVerification, the server certificate's
// hostname will not be checked to match the hostname in addr. Otherwise, flags
// should be 0.
//
// Dial probably won't work for you unless you set a verify location or add
// some certs to the certificate store of the client context you're using.
// This library is not nice enough to use the system certificate store by
// default for you yet.
func Dial(network, addr string, ctx *Ctx, flags DialFlags) (*Conn, error) {
conn, err := DialSession(network, addr, ctx, flags, nil)
runtime.KeepAlive(ctx)
return conn, err
}
// DialSession will connect to network/address and then wrap the corresponding
// underlying connection with an OpenSSL client connection using context ctx.
// If flags includes InsecureSkipHostVerification, the server certificate's
// hostname will not be checked to match the hostname in addr. Otherwise, flags
// should be 0.
//
// Dial probably won't work for you unless you set a verify location or add
// some certs to the certificate store of the client context you're using.
// This library is not nice enough to use the system certificate store by
// default for you yet.
//
// If session is not nil it will be used to resume the tls state. The session
// can be retrieved from the GetSession method on the Conn.
func DialSession(network, addr string, ctx *Ctx, flags DialFlags,
session []byte) (*Conn, error) {
host, _, err := net.SplitHostPort(addr)
if err != nil {
return nil, err
}
if ctx == nil {
var err error
ctx, err = NewCtx()
if err != nil {
return nil, err
}
// TODO: use operating system default certificate chain?
}
c, err := net.Dial(network, addr)
if err != nil {
return nil, err
}
conn, err := Client(c, ctx)
if err != nil {
c.Close()
return nil, err
}
if session != nil {
err := conn.setSession(session)
if err != nil {
c.Close()
return nil, err
}
}
if flags&DisableSNI == 0 {
err = conn.SetTlsExtHostName(host)
if err != nil {
conn.Close()
return nil, err
}
}
err = conn.Handshake()
if err != nil {
conn.Close()
return nil, err
}
if flags&InsecureSkipHostVerification == 0 {
err = conn.VerifyHostname(host)
if err != nil {
conn.Close()
return nil, err
}
}
return conn, nil
}
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