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p2p: add trust check to handshake, test privileged connectivity

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Conflicts:
	p2p/server_test.go
This commit is contained in:
Péter Szilágyi 2015-04-30 12:41:27 +03:00
parent 14f32a0c3a
commit 1528dbc171
4 changed files with 88 additions and 15 deletions
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14
p2p/handshake.go
View File

@ -70,21 +70,21 @@ type protoHandshake struct {
// If dial is non-nil, the connection the local node is the initiator.
// If atcap is true, the connection will be disconnected with DiscTooManyPeers
// after the key exchange.
func setupConn(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, dial *discover.Node, atcap bool) (*conn, error) {
func setupConn(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, dial *discover.Node, atcap bool, trust map[discover.NodeID]bool) (*conn, error) {
if dial == nil {
return setupInboundConn(fd, prv, our, atcap)
return setupInboundConn(fd, prv, our, atcap, trust)
} else {
return setupOutboundConn(fd, prv, our, dial, atcap)
return setupOutboundConn(fd, prv, our, dial, atcap, trust)
}
}
func setupInboundConn(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, atcap bool) (*conn, error) {
func setupInboundConn(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, atcap bool, trust map[discover.NodeID]bool) (*conn, error) {
secrets, err := receiverEncHandshake(fd, prv, nil)
if err != nil {
return nil, fmt.Errorf("encryption handshake failed: %v", err)
}
rw := newRlpxFrameRW(fd, secrets)
if atcap {
if atcap && !trust[secrets.RemoteID] {
SendItems(rw, discMsg, DiscTooManyPeers)
return nil, errors.New("we have too many peers")
}
@ -99,13 +99,13 @@ func setupInboundConn(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, a
return &conn{rw, rhs}, nil
}
func setupOutboundConn(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, dial *discover.Node, atcap bool) (*conn, error) {
func setupOutboundConn(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, dial *discover.Node, atcap bool, trust map[discover.NodeID]bool) (*conn, error) {
secrets, err := initiatorEncHandshake(fd, prv, dial.ID, nil)
if err != nil {
return nil, fmt.Errorf("encryption handshake failed: %v", err)
}
rw := newRlpxFrameRW(fd, secrets)
if atcap {
if atcap && !trust[secrets.RemoteID] {
SendItems(rw, discMsg, DiscTooManyPeers)
return nil, errors.New("we have too many peers")
}

4
p2p/handshake_test.go
View File

@ -143,7 +143,7 @@ func TestSetupConn(t *testing.T) {
done := make(chan struct{})
go func() {
defer close(done)
conn0, err := setupConn(fd0, prv0, hs0, node1, false)
conn0, err := setupConn(fd0, prv0, hs0, node1, false, nil)
if err != nil {
t.Errorf("outbound side error: %v", err)
return
@ -156,7 +156,7 @@ func TestSetupConn(t *testing.T) {
}
}()
conn1, err := setupConn(fd1, prv1, hs1, nil, false)
conn1, err := setupConn(fd1, prv1, hs1, nil, false, nil)
if err != nil {
t.Fatalf("inbound side error: %v", err)
}

17
p2p/server.go
View File

@ -115,7 +115,7 @@ type Server struct {
peerWG sync.WaitGroup // active peer goroutines
}
type setupFunc func(net.Conn, *ecdsa.PrivateKey, *protoHandshake, *discover.Node, bool) (*conn, error)
type setupFunc func(net.Conn, *ecdsa.PrivateKey, *protoHandshake, *discover.Node, bool, map[discover.NodeID]bool) (*conn, error)
type newPeerHook func(*Peer)
// Peers returns all connected peers.
@ -140,7 +140,10 @@ func (srv *Server) PeerCount() int {
// TrustPeer inserts a node into the list of privileged nodes.
func (srv *Server) TrustPeer(node *discover.Node) {
srv.trustDial <- node
srv.lock.Lock()
defer srv.lock.Unlock()
srv.trusts[node.ID] = node
}
// Broadcast sends an RLP-encoded message to all connected peers.
@ -470,10 +473,18 @@ func (srv *Server) startPeer(fd net.Conn, dest *discover.Node) {
// returns during that exchange need to call peerWG.Done because
// the callers of startPeer added the peer to the wait group already.
fd.SetDeadline(time.Now().Add(handshakeTimeout))
// Check capacity and trust list
srv.lock.RLock()
atcap := len(srv.peers) == srv.MaxPeers
trust := make(map[discover.NodeID]bool)
for id, _ := range srv.trusts {
trust[id] = true
}
srv.lock.RUnlock()
conn, err := srv.setupFunc(fd, srv.PrivateKey, srv.ourHandshake, dest, atcap)
conn, err := srv.setupFunc(fd, srv.PrivateKey, srv.ourHandshake, dest, atcap, trust)
if err != nil {
fd.Close()
glog.V(logger.Debug).Infof("Handshake with %v failed: %v", fd.RemoteAddr(), err)

66
p2p/server_test.go
View File

@ -22,7 +22,7 @@ func startTestServer(t *testing.T, pf newPeerHook) *Server {
ListenAddr: "127.0.0.1:0",
PrivateKey: newkey(),
newPeerHook: pf,
setupFunc: func(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, dial *discover.Node, atcap bool) (*conn, error) {
setupFunc: func(fd net.Conn, prv *ecdsa.PrivateKey, our *protoHandshake, dial *discover.Node, atcap bool, trust map[discover.NodeID]bool) (*conn, error) {
id := randomID()
rw := newRlpxFrameRW(fd, secrets{
MAC: zero16,
@ -200,7 +200,7 @@ func TestServerDisconnectAtCap(t *testing.T) {
// Run the handshakes just like a real peer would.
key := newkey()
hs := &protoHandshake{Version: baseProtocolVersion, ID: discover.PubkeyID(&key.PublicKey)}
_, err = setupConn(conn, key, hs, srv.Self(), false)
_, err = setupConn(conn, key, hs, srv.Self(), false, nil)
if i == nconns-1 {
// When handling the last connection, the server should
// disconnect immediately instead of running the protocol
@ -219,6 +219,68 @@ func TestServerDisconnectAtCap(t *testing.T) {
}
}
// Tests that trusted peers and can connect above max peer caps.
func TestServerTrustedPeers(t *testing.T) {
defer testlog(t).detach()
// Create a test server with limited connection slots
started := make(chan *Peer)
server := &Server{
ListenAddr: "127.0.0.1:0",
PrivateKey: newkey(),
MaxPeers: 3,
NoDial: true,
newPeerHook: func(p *Peer) { started <- p },
}
if err := server.Start(); err != nil {
t.Fatal(err)
}
defer server.Stop()
// Fill up all the slots on the server
dialer := &net.Dialer{Deadline: time.Now().Add(3 * time.Second)}
for i := 0; i < server.MaxPeers; i++ {
// Establish a new connection
conn, err := dialer.Dial("tcp", server.ListenAddr)
if err != nil {
t.Fatalf("conn %d: dial error: %v", i, err)
}
defer conn.Close()
// Run the handshakes just like a real peer would, and wait for completion
key := newkey()
shake := &protoHandshake{Version: baseProtocolVersion, ID: discover.PubkeyID(&key.PublicKey)}
if _, err = setupConn(conn, key, shake, server.Self(), false, nil); err != nil {
t.Fatalf("conn %d: unexpected error: %v", i, err)
}
<-started
}
// Inject a trusted node and dial that (we'll connect from this end, don't need IP setup)
key := newkey()
trusted := &discover.Node{
ID: discover.PubkeyID(&key.PublicKey),
}
server.TrustPeer(trusted)
conn, err := dialer.Dial("tcp", server.ListenAddr)
if err != nil {
t.Fatalf("trusted node: dial error: %v", err)
}
defer conn.Close()
shake := &protoHandshake{Version: baseProtocolVersion, ID: trusted.ID}
if _, err = setupConn(conn, key, shake, server.Self(), false, nil); err != nil {
t.Fatalf("trusted node: unexpected error: %v", err)
}
select {
case <-started:
// Ok, trusted peer accepted
case <-time.After(100 * time.Millisecond):
t.Fatalf("trusted node timeout")
}
}
func newkey() *ecdsa.PrivateKey {
key, err := crypto.GenerateKey()
if err != nil {