dendrite/cmd/dendrite-demo-yggdrasil/yggconn/session.go

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// Copyright 2020 The Matrix.org Foundation C.I.C.
//
// 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 yggconn
import (
"context"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"encoding/hex"
"encoding/pem"
"errors"
"math/big"
"net"
"time"
"github.com/lucas-clemente/quic-go"
"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
)
func (n *Node) listenFromYgg() {
var err error
n.listener, err = quic.Listen(
n.packetConn, // yggdrasil.PacketConn
n.tlsConfig, // TLS config
n.quicConfig, // QUIC config
)
if err != nil {
panic(err)
}
for {
session, err := n.listener.Accept(context.TODO())
if err != nil {
n.log.Println("n.listener.Accept:", err)
return
}
go n.listenFromQUIC(session)
}
}
func (n *Node) listenFromQUIC(session quic.Session) {
n.sessions.Store(session.RemoteAddr().String(), session)
defer n.sessions.Delete(session.RemoteAddr())
for {
st, err := session.AcceptStream(context.TODO())
if err != nil {
n.log.Println("session.AcceptStream:", err)
return
}
n.incoming <- QUICStream{st, session}
}
}
// Implements net.Listener
func (n *Node) Accept() (net.Conn, error) {
return <-n.incoming, nil
}
// Implements net.Listener
func (n *Node) Close() error {
return n.listener.Close()
}
// Implements net.Listener
func (n *Node) Addr() net.Addr {
return n.listener.Addr()
}
// Implements http.Transport.Dial
func (n *Node) Dial(network, address string) (net.Conn, error) {
return n.DialContext(context.TODO(), network, address)
}
// Implements http.Transport.DialContext
func (n *Node) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
s, ok1 := n.sessions.Load(address)
session, ok2 := s.(quic.Session)
if !ok1 || !ok2 || (ok1 && ok2 && session.ConnectionState().HandshakeComplete) {
dest, err := hex.DecodeString(address)
if err != nil {
return nil, err
}
if len(dest) != crypto.BoxPubKeyLen {
return nil, errors.New("invalid key length supplied")
}
var pubKey crypto.BoxPubKey
copy(pubKey[:], dest)
session, err = quic.Dial(
n.packetConn, // yggdrasil.PacketConn
&pubKey, // dial address
address, // dial SNI
n.tlsConfig, // TLS config
n.quicConfig, // QUIC config
)
if err != nil {
n.log.Println("n.dialer.DialContext:", err)
return nil, err
}
go n.listenFromQUIC(session)
}
st, err := session.OpenStream()
if err != nil {
n.log.Println("session.OpenStream:", err)
return nil, err
}
return QUICStream{st, session}, nil
}
func (n *Node) generateTLSConfig() *tls.Config {
key, err := rsa.GenerateKey(rand.Reader, 1024)
if err != nil {
panic(err)
}
template := x509.Certificate{
SerialNumber: big.NewInt(1),
NotAfter: time.Now().Add(time.Hour * 24 * 365),
DNSNames: []string{n.DerivedSessionName()},
}
certDER, err := x509.CreateCertificate(rand.Reader, &template, &template, &key.PublicKey, key)
if err != nil {
panic(err)
}
keyPEM := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)})
certPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certDER})
tlsCert, err := tls.X509KeyPair(certPEM, keyPEM)
if err != nil {
panic(err)
}
return &tls.Config{
Certificates: []tls.Certificate{tlsCert},
NextProtos: []string{"quic-matrix-ygg"},
InsecureSkipVerify: true,
}
}