Yggdrasil demo updates ("Bare QUIC")

Squashed commit of the following:

commit 86c2388e13ffdbabdd50cea205652dccc40e1860
Merge: b0a3ee6c f5e7e751
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Thu Jul 16 13:47:10 2020 +0100

    Merge branch 'master' into neilalexander/yggbarequic

commit b0a3ee6c5c063962384bb91c59ec753ddc8cfe5f
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Thu Jul 16 13:42:22 2020 +0100

    Add support for broadcasting wake-up EDUs to known hosts

commit 8a5c2020b3a4b705b5d5686a9e71990a49e6d471
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Thu Jul 16 13:42:10 2020 +0100

    Bare QUIC demo working

commit d3939b3d6568cf4262c0391486a5203873b68bfc
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Wed Jul 15 11:42:43 2020 +0100

    Support bare Yggdrasil sessions with encrypted QUIC

4 files changed, 60 insertions, 95 deletions

diff --git a/cmd/dendrite-demo-yggdrasil/main.go b/cmd/dendrite-demo-yggdrasil/main.go
index 33bcd102..7ab90000 100644
--- a/cmd/dendrite-demo-yggdrasil/main.go
+++ b/cmd/dendrite-demo-yggdrasil/main.go
@@ -17,7 +17,6 @@ package main
 import (
 	"context"
 	"crypto/tls"
-	"encoding/hex"
 	"flag"
 	"fmt"
 	"net"
@@ -42,7 +41,6 @@ import (
 	"github.com/matrix-org/dendrite/roomserver"
 	"github.com/matrix-org/dendrite/userapi"
 	"github.com/matrix-org/gomatrixserverlib"
-	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
 
 	"github.com/sirupsen/logrus"
 )
@@ -158,31 +156,6 @@ func main() {
 		base.UseHTTPAPIs,
 	)
 
-	ygg.NewSession = func(serverName gomatrixserverlib.ServerName) {
-		logrus.Infof("Found new session %q", serverName)
-		req := &api.PerformServersAliveRequest{
-			Servers: []gomatrixserverlib.ServerName{serverName},
-		}
-		res := &api.PerformServersAliveResponse{}
-		if err := fsAPI.PerformServersAlive(context.TODO(), req, res); err != nil {
-			logrus.WithError(err).Warn("Failed to notify server alive due to new session")
-		}
-	}
-
-	ygg.NotifyLinkNew(func(_ crypto.BoxPubKey, sigPubKey crypto.SigPubKey, linkType, remote string) {
-		serverName := hex.EncodeToString(sigPubKey[:])
-		logrus.Infof("Found new peer %q", serverName)
-		req := &api.PerformServersAliveRequest{
-			Servers: []gomatrixserverlib.ServerName{
-				gomatrixserverlib.ServerName(serverName),
-			},
-		}
-		res := &api.PerformServersAliveResponse{}
-		if err := fsAPI.PerformServersAlive(context.TODO(), req, res); err != nil {
-			logrus.WithError(err).Warn("Failed to notify server alive due to new session")
-		}
-	})
-
 	// Build both ends of a HTTP multiplex.
 	httpServer := &http.Server{
 		Addr:         ":0",
@@ -205,6 +178,14 @@ func main() {
 		logrus.Info("Listening on ", httpBindAddr)
 		logrus.Fatal(http.ListenAndServe(httpBindAddr, base.BaseMux))
 	}()
+	go func() {
+		logrus.Info("Sending wake-up message to known nodes")
+		req := &api.PerformBroadcastEDURequest{}
+		res := &api.PerformBroadcastEDUResponse{}
+		if err := fsAPI.PerformBroadcastEDU(context.TODO(), req, res); err != nil {
+			logrus.WithError(err).Error("Failed to send wake-up message to known nodes")
+		}
+	}()
 
 	select {}
 }
diff --git a/cmd/dendrite-demo-yggdrasil/yggconn/client.go b/cmd/dendrite-demo-yggdrasil/yggconn/client.go
index b74468db..c5b3eb72 100644
--- a/cmd/dendrite-demo-yggdrasil/yggconn/client.go
+++ b/cmd/dendrite-demo-yggdrasil/yggconn/client.go
@@ -1,35 +1,13 @@
 package yggconn
 
 import (
-	"context"
-	"crypto/ed25519"
-	"encoding/hex"
-	"fmt"
-	"net"
 	"net/http"
-	"strings"
 	"time"
 
-	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/convert"
 	"github.com/matrix-org/dendrite/internal/setup"
 	"github.com/matrix-org/gomatrixserverlib"
 )
 
-func (n *Node) yggdialer(_, address string) (net.Conn, error) {
-	tokens := strings.Split(address, ":")
-	raw, err := hex.DecodeString(tokens[0])
-	if err != nil {
-		return nil, fmt.Errorf("hex.DecodeString: %w", err)
-	}
-	converted := convert.Ed25519PublicKeyToCurve25519(ed25519.PublicKey(raw))
-	convhex := hex.EncodeToString(converted)
-	return n.Dial("curve25519", convhex)
-}
-
-func (n *Node) yggdialerctx(ctx context.Context, network, address string) (net.Conn, error) {
-	return n.yggdialer(network, address)
-}
-
 type yggroundtripper struct {
 	inner *http.Transport
 }
@@ -49,7 +27,7 @@ func (n *Node) CreateClient(
 				TLSHandshakeTimeout:   20 * time.Second,
 				ResponseHeaderTimeout: 10 * time.Second,
 				IdleConnTimeout:       60 * time.Second,
-				DialContext:           n.yggdialerctx,
+				DialContext:           n.DialerContext,
 			},
 		},
 	)
@@ -66,7 +44,8 @@ func (n *Node) CreateFederationClient(
 				TLSHandshakeTimeout:   20 * time.Second,
 				ResponseHeaderTimeout: 10 * time.Second,
 				IdleConnTimeout:       60 * time.Second,
-				DialContext:           n.yggdialerctx,
+				DialContext:           n.DialerContext,
+				TLSClientConfig:       n.tlsConfig,
 			},
 		},
 	)
diff --git a/cmd/dendrite-demo-yggdrasil/yggconn/node.go b/cmd/dendrite-demo-yggdrasil/yggconn/node.go
index 2bc300c8..67aec050 100644
--- a/cmd/dendrite-demo-yggdrasil/yggconn/node.go
+++ b/cmd/dendrite-demo-yggdrasil/yggconn/node.go
@@ -20,6 +20,7 @@ import (
 	"crypto/tls"
 	"encoding/hex"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"log"
@@ -33,9 +34,7 @@ import (
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/convert"
 	"github.com/matrix-org/gomatrixserverlib"
 
-	yggdrasiladmin "github.com/yggdrasil-network/yggdrasil-go/src/admin"
 	yggdrasilconfig "github.com/yggdrasil-network/yggdrasil-go/src/config"
-	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
 	yggdrasilmulticast "github.com/yggdrasil-network/yggdrasil-go/src/multicast"
 	"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
 
@@ -46,10 +45,8 @@ type Node struct {
 	core       *yggdrasil.Core
 	config     *yggdrasilconfig.NodeConfig
 	state      *yggdrasilconfig.NodeState
-	admin      *yggdrasiladmin.AdminSocket
 	multicast  *yggdrasilmulticast.Multicast
 	log        *gologme.Logger
-	packetConn *yggdrasil.PacketConn
 	listener   quic.Listener
 	tlsConfig  *tls.Config
 	quicConfig *quic.Config
@@ -58,15 +55,10 @@ type Node struct {
 	NewSession func(remote gomatrixserverlib.ServerName)
 }
 
-func (n *Node) BuildName() string {
-	return "dendrite"
-}
-
-func (n *Node) BuildVersion() string {
-	return "dev"
-}
-
 func (n *Node) Dialer(_, address string) (net.Conn, error) {
+	if len(n.core.GetSwitchPeers()) == 0 {
+		return nil, errors.New("no peer connections available")
+	}
 	tokens := strings.Split(address, ":")
 	raw, err := hex.DecodeString(tokens[0])
 	if err != nil {
@@ -86,12 +78,10 @@ func Setup(instanceName, storageDirectory string) (*Node, error) {
 	n := &Node{
 		core:      &yggdrasil.Core{},
 		config:    yggdrasilconfig.GenerateConfig(),
-		admin:     &yggdrasiladmin.AdminSocket{},
 		multicast: &yggdrasilmulticast.Multicast{},
 		log:       gologme.New(os.Stdout, "YGG ", log.Flags()),
 		incoming:  make(chan QUICStream),
 	}
-	n.core.SetBuildInfo(n)
 
 	yggfile := fmt.Sprintf("%s/%s-yggdrasil.conf", storageDirectory, instanceName)
 	if _, err := os.Stat(yggfile); !os.IsNotExist(err) {
@@ -132,20 +122,22 @@ func Setup(instanceName, storageDirectory string) (*Node, error) {
 		panic(err)
 	}
 
-	n.packetConn = n.core.PacketConn()
 	n.tlsConfig = n.generateTLSConfig()
 	n.quicConfig = &quic.Config{
 		MaxIncomingStreams:    0,
 		MaxIncomingUniStreams: 0,
 		KeepAlive:             true,
-		MaxIdleTimeout:        time.Minute * 15,
-		HandshakeTimeout:      time.Second * 15,
+		MaxIdleTimeout:        time.Minute * 30,
+		HandshakeTimeout:      time.Second * 30,
 	}
 
 	n.log.Println("Public curve25519:", n.core.EncryptionPublicKey())
 	n.log.Println("Public ed25519:", n.core.SigningPublicKey())
 
-	go n.listenFromYgg()
+	go func() {
+		time.Sleep(time.Second)
+		n.listenFromYgg()
+	}()
 
 	return n, nil
 }
@@ -193,9 +185,11 @@ func (n *Node) KnownNodes() []gomatrixserverlib.ServerName {
 	nodemap := map[string]struct{}{
 		"b5ae50589e50991dd9dd7d59c5c5f7a4521e8da5b603b7f57076272abc58b374": struct{}{},
 	}
-	for _, peer := range n.core.GetSwitchPeers() {
-		nodemap[hex.EncodeToString(peer.SigningKey[:])] = struct{}{}
-	}
+	/*
+		for _, peer := range n.core.GetSwitchPeers() {
+			nodemap[hex.EncodeToString(peer.SigningKey[:])] = struct{}{}
+		}
+	*/
 	n.sessions.Range(func(_, v interface{}) bool {
 		session, ok := v.(quic.Session)
 		if !ok {
@@ -266,11 +260,3 @@ func (n *Node) SetStaticPeer(uri string) error {
 	}
 	return nil
 }
-
-func (n *Node) NotifyLinkNew(f func(boxPubKey crypto.BoxPubKey, sigPubKey crypto.SigPubKey, linkType, remote string)) {
-	n.core.NotifyLinkNew(f)
-}
-
-func (n *Node) NotifyLinkGone(f func(boxPubKey crypto.BoxPubKey, sigPubKey crypto.SigPubKey, linkType, remote string)) {
-	n.core.NotifyLinkGone(f)
-}
diff --git a/cmd/dendrite-demo-yggdrasil/yggconn/session.go b/cmd/dendrite-demo-yggdrasil/yggconn/session.go
index ff77e64f..0d231f6d 100644
--- a/cmd/dendrite-demo-yggdrasil/yggconn/session.go
+++ b/cmd/dendrite-demo-yggdrasil/yggconn/session.go
@@ -24,19 +24,19 @@ import (
 	"encoding/hex"
 	"encoding/pem"
 	"errors"
+	"fmt"
 	"math/big"
 	"net"
 	"time"
 
 	"github.com/lucas-clemente/quic-go"
-	"github.com/matrix-org/gomatrixserverlib"
 	"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.core,       // yggdrasil.PacketConn
 		n.tlsConfig,  // TLS config
 		n.quicConfig, // QUIC config
 	)
@@ -45,24 +45,25 @@ func (n *Node) listenFromYgg() {
 	}
 
 	for {
+		n.log.Infoln("Waiting to accept QUIC sessions")
 		session, err := n.listener.Accept(context.TODO())
 		if err != nil {
 			n.log.Println("n.listener.Accept:", err)
 			return
 		}
-		go n.listenFromQUIC(session)
+		if len(session.ConnectionState().PeerCertificates) != 1 {
+			_ = session.CloseWithError(0, "expected a peer certificate")
+			continue
+		}
+		address := session.ConnectionState().PeerCertificates[0].Subject.CommonName
+		n.log.Infoln("Accepted connection from", address)
+		go n.listenFromQUIC(session, address)
 	}
 }
 
-func (n *Node) listenFromQUIC(session quic.Session) {
-	n.sessions.Store(session.RemoteAddr().String(), session)
-	defer n.sessions.Delete(session.RemoteAddr())
-	if n.NewSession != nil {
-		if len(session.ConnectionState().PeerCertificates) == 1 {
-			subjectName := session.ConnectionState().PeerCertificates[0].Subject.CommonName
-			go n.NewSession(gomatrixserverlib.ServerName(subjectName))
-		}
-	}
+func (n *Node) listenFromQUIC(session quic.Session, address string) {
+	n.sessions.Store(address, session)
+	defer n.sessions.Delete(address)
 	for {
 		st, err := session.AcceptStream(context.TODO())
 		if err != nil {
@@ -107,10 +108,23 @@ func (n *Node) DialContext(ctx context.Context, network, address string) (net.Co
 		}
 		var pubKey crypto.BoxPubKey
 		copy(pubKey[:], dest)
+		nodeID := crypto.GetNodeID(&pubKey)
+		nodeMask := &crypto.NodeID{}
+		for i := range nodeMask {
+			nodeMask[i] = 0xFF
+		}
+
+		fmt.Println("Resolving coords")
+		coords, err := n.core.Resolve(nodeID, nodeMask)
+		if err != nil {
+			return nil, fmt.Errorf("n.core.Resolve: %w", err)
+		}
+		fmt.Println("Found coords:", coords)
+		fmt.Println("Dialling")
 
 		session, err = quic.Dial(
-			n.packetConn, // yggdrasil.PacketConn
-			&pubKey,      // dial address
+			n.core,       // yggdrasil.PacketConn
+			coords,       // dial address
 			address,      // dial SNI
 			n.tlsConfig,  // TLS config
 			n.quicConfig, // QUIC config
@@ -119,7 +133,8 @@ func (n *Node) DialContext(ctx context.Context, network, address string) (net.Co
 			n.log.Println("n.dialer.DialContext:", err)
 			return nil, err
 		}
-		go n.listenFromQUIC(session)
+		fmt.Println("Dial OK")
+		go n.listenFromQUIC(session, address)
 	}
 	st, err := session.OpenStream()
 	if err != nil {
@@ -157,5 +172,9 @@ func (n *Node) generateTLSConfig() *tls.Config {
 		Certificates:       []tls.Certificate{tlsCert},
 		NextProtos:         []string{"quic-matrix-ygg"},
 		InsecureSkipVerify: true,
+		ClientAuth:         tls.RequireAnyClientCert,
+		GetClientCertificate: func(info *tls.CertificateRequestInfo) (*tls.Certificate, error) {
+			return &tlsCert, nil
+		},
 	}
 }