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identityProvider.go
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identityProvider.go
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package libp2p
import (
"context"
"encoding/hex"
"time"
"github.com/ElrondNetwork/elrond-go/core"
"github.com/ElrondNetwork/elrond-go/core/check"
"github.com/ElrondNetwork/elrond-go/p2p"
"github.com/ElrondNetwork/elrond-go/p2p/data"
"github.com/libp2p/go-libp2p-core/host"
"github.com/libp2p/go-libp2p-core/network"
"github.com/multiformats/go-multiaddr"
)
const authProtocolID = "elrond-node-auth/0.0.1"
const maxBytesToReceive = 1024
type identityProvider struct {
host host.Host
networkShardingCollector p2p.NetworkShardingCollector
signerVerifier p2p.SignerVerifier
marshalizer p2p.Marshalizer
receiveTimeout time.Duration
}
// NewIdentityProvider creates a wrapper over libp2p's network.Notifiee implementation
// that is able to do a supplemental authentication against each peer connected
func NewIdentityProvider(
host host.Host,
networkShardingCollector p2p.NetworkShardingCollector,
signerVerifier p2p.SignerVerifier,
marshalizer p2p.Marshalizer,
receiveTimeout time.Duration,
) (*identityProvider, error) {
if host == nil {
return nil, p2p.ErrNilHost
}
if check.IfNil(networkShardingCollector) {
return nil, p2p.ErrNilNetworkShardingCollector
}
if check.IfNil(signerVerifier) {
return nil, p2p.ErrNilSignerVerifier
}
if check.IfNil(marshalizer) {
return nil, p2p.ErrNilMarshalizer
}
ip := &identityProvider{
host: host,
networkShardingCollector: networkShardingCollector,
signerVerifier: signerVerifier,
marshalizer: marshalizer,
receiveTimeout: receiveTimeout,
}
ip.host.SetStreamHandler(authProtocolID, ip.handleStreams)
return ip, nil
}
// Listen is called when network starts listening on an addr
func (ip *identityProvider) Listen(network.Network, multiaddr.Multiaddr) {}
// ListenClose is called when network stops listening on an addr
func (ip *identityProvider) ListenClose(network.Network, multiaddr.Multiaddr) {}
// Connected is called when a connection opened
func (ip *identityProvider) Connected(_ network.Network, conn network.Conn) {
go func() {
ctx := context.Background()
s, err := ip.host.NewStream(ctx, conn.RemotePeer(), authProtocolID)
if err != nil {
log.Debug("identity provider handleStreams", "error", err.Error())
return
}
buff, err := ip.createPayload()
if err != nil {
log.Warn("identity provider can not create payload", "error", err.Error())
return
}
_, err = s.Write(buff)
if err != nil {
log.Debug("identity provider write", "error", err.Error())
return
}
log.Trace("message sent", "payload hex", hex.EncodeToString(buff))
}()
}
// Disconnected is called when a connection closed
func (ip *identityProvider) Disconnected(network.Network, network.Conn) {}
// OpenedStream is called when a stream opened
func (ip *identityProvider) OpenedStream(network.Network, network.Stream) {}
// ClosedStream is called when a stream closed
func (ip *identityProvider) ClosedStream(network.Network, network.Stream) {}
func (ip *identityProvider) createPayload() ([]byte, error) {
am := data.AuthMessage{}
am.Message = []byte(ip.host.ID())
am.Timestamp = time.Now().Unix()
am.Pubkey = ip.signerVerifier.PublicKey()
buffWithoutSig, err := ip.marshalizer.Marshal(&am)
if err != nil {
return nil, err
}
sig, err := ip.signerVerifier.Sign(buffWithoutSig)
if err != nil {
return nil, err
}
am.Sig = sig
payload, err := ip.marshalizer.Marshal(&am)
if err != nil {
return nil, err
}
return payload, err
}
func (ip *identityProvider) handleStreams(s network.Stream) {
chError := make(chan error)
chData := make(chan []byte)
go func() {
buff := make([]byte, maxBytesToReceive)
n, err := s.Read(buff)
if err != nil {
chError <- err
return
}
recvBuff := buff[:n]
chData <- recvBuff
}()
select {
case recvBuff := <-chData:
log.Trace("message received", "payload hex", hex.EncodeToString(recvBuff))
err := ip.processReceivedData(recvBuff)
if err != nil {
log.Debug("identity provider processReceivedData", "error", err)
}
case err := <-chError:
log.Debug("identity provider read", "error", err.Error())
_ = s.Close()
case <-time.After(ip.receiveTimeout):
log.Debug("identity provider read", "error", "timeout")
}
}
func (ip *identityProvider) processReceivedData(recvBuff []byte) error {
receivedAm := &data.AuthMessage{}
err := ip.marshalizer.Unmarshal(receivedAm, recvBuff)
if err != nil {
return err
}
copiedAm := *receivedAm
copiedAm.Sig = nil
bufWithoutSig, err := ip.marshalizer.Marshal(&copiedAm)
if err != nil {
return err
}
err = ip.signerVerifier.Verify(bufWithoutSig, receivedAm.Sig, receivedAm.Pubkey)
if err != nil {
return err
}
pid := core.PeerID(receivedAm.Message)
ip.networkShardingCollector.UpdatePeerIdPublicKey(pid, receivedAm.Pubkey)
log.Trace("received authentication", "from", pid.Pretty(), "pk", hex.EncodeToString(receivedAm.Pubkey))
return nil
}