Remove auth_enc config option

As we didn't hear any voices requesting this feature, we removed the
option to disable it and always have peer connection auth encrypted.

closes #1518
follow-up #1325

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Changelog
 
+- [p2p] remove `auth_enc` config option, peer connections are always auth
+  encrypted
+
 ## 0.19.7
 
 BREAKING:

config/config.go

@@ -287,9 +287,6 @@ type P2PConfig struct {
 	// Does not work if the peer-exchange reactor is disabled.
 	SeedMode bool `mapstructure:"seed_mode"`
 
-	// Authenticated encryption
-	AuthEnc bool `mapstructure:"auth_enc"`
-
 	// Comma separated list of peer IDs to keep private (will not be gossiped to other peers)
 	PrivatePeerIDs string `mapstructure:"private_peer_ids"`
 
@@ -310,7 +307,6 @@ func DefaultP2PConfig() *P2PConfig {
 		RecvRate:                512000, // 500 kB/s
 		PexReactor:              true,
 		SeedMode:                false,
-		AuthEnc:                 true,
 		AllowDuplicateIP:        true, // so non-breaking yet
 	}
 }

config/toml.go

@@ -165,9 +165,6 @@ pex = {{ .P2P.PexReactor }}
 # Does not work if the peer-exchange reactor is disabled.
 seed_mode = {{ .P2P.SeedMode }}
 
-# Authenticated encryption
-auth_enc = {{ .P2P.AuthEnc }}
-
 # Comma separated list of peer IDs to keep private (will not be gossiped to other peers)
 private_peer_ids = "{{ .P2P.PrivatePeerIDs }}"
 

docs/examples/node0/config/config.toml

@@ -103,9 +103,6 @@ pex = true
 # Does not work if the peer-exchange reactor is disabled.
 seed_mode = false
 
-# Authenticated encryption
-auth_enc = true
-
 # Comma separated list of peer IDs to keep private (will not be gossiped to other peers)
 private_peer_ids = ""
 

docs/examples/node1/config/config.toml

@@ -103,9 +103,6 @@ pex = true
 # Does not work if the peer-exchange reactor is disabled.
 seed_mode = false
 
-# Authenticated encryption
-auth_enc = true
-
 # Comma separated list of peer IDs to keep private (will not be gossiped to other peers)
 private_peer_ids = ""
 

docs/examples/node2/config/config.toml

@@ -103,9 +103,6 @@ pex = true
 # Does not work if the peer-exchange reactor is disabled.
 seed_mode = false
 
-# Authenticated encryption
-auth_enc = true
-
 # Comma separated list of peer IDs to keep private (will not be gossiped to other peers)
 private_peer_ids = ""
 

docs/examples/node3/config/config.toml

@@ -103,9 +103,6 @@ pex = true
 # Does not work if the peer-exchange reactor is disabled.
 seed_mode = false
 
-# Authenticated encryption
-auth_enc = true
-
 # Comma separated list of peer IDs to keep private (will not be gossiped to other peers)
 private_peer_ids = ""
 

docs/spec/p2p/peer.md

@@ -17,9 +17,6 @@ We will attempt to connect to the peer at IP:PORT, and verify,
 via authenticated encryption, that it is in possession of the private key
 corresponding to `<ID>`. This prevents man-in-the-middle attacks on the peer layer.
 
-If `auth_enc = false`, peers can use an arbitrary ID, but they must always use
-one. Authentication can then happen out-of-band of Tendermint, for instance via VPN.
-
 ## Connections
 
 All p2p connections use TCP.

docs/specification/configuration.rst

@@ -122,9 +122,6 @@ like the file below, however, double check by inspecting the
     # Does not work if the peer-exchange reactor is disabled.
     seed_mode = false
 
-    # Authenticated encryption
-    auth_enc = true
-
     # Comma separated list of peer IDs to keep private (will not be gossiped to other peers)
     private_peer_ids = ""
 

docs/specification/secure-p2p.rst

@@ -65,9 +65,7 @@ are connected to at least one validator.
 Config
 ------
 
-Authenticated encryption is enabled by default. If you wish to use another
-authentication scheme or your peers are connected via VPN, you can turn it off
-by setting ``auth_enc`` to ``false`` in the config file.
+Authenticated encryption is enabled by default.
 
 Additional Reading
 ------------------

node/node.go

@@ -269,9 +269,6 @@ func NewNode(config *cfg.Config,
 	// but it would still be nice to have a clear list of the current "PersistentPeers"
 	// somewhere that we can return with net_info.
 	//
-	// Let's assume we always have IDs ... and we just dont authenticate them
-	// if auth_enc=false.
-	//
 	// If PEX is on, it should handle dialing the seeds. Otherwise the switch does it.
 	// Note we currently use the addrBook regardless at least for AddOurAddress
 	addrBook := pex.NewAddrBook(config.P2P.AddrBookFile(), config.P2P.AddrBookStrict)

p2p/peer.go

@@ -116,8 +116,6 @@ func newPeer(pc peerConn, nodeInfo NodeInfo,
 
 // PeerConfig is a Peer configuration.
 type PeerConfig struct {
-	AuthEnc bool `mapstructure:"auth_enc"` // authenticated encryption
-
 	// times are in seconds
 	HandshakeTimeout time.Duration `mapstructure:"handshake_timeout"`
 	DialTimeout      time.Duration `mapstructure:"dial_timeout"`
@@ -132,7 +130,6 @@ type PeerConfig struct {
 // DefaultPeerConfig returns the default config.
 func DefaultPeerConfig() *PeerConfig {
 	return &PeerConfig{
-		AuthEnc:          true,
 		HandshakeTimeout: 20, // * time.Second,
 		DialTimeout:      3,  // * time.Second,
 		MConfig:          tmconn.DefaultMConnConfig(),
@@ -159,7 +156,7 @@ func newOutboundPeerConn(addr *NetAddress, config *PeerConfig, persistent bool,
 	}
 
 	// ensure dialed ID matches connection ID
-	if config.AuthEnc && addr.ID != pc.ID() {
+	if addr.ID != pc.ID() {
 		if err2 := conn.Close(); err2 != nil {
 			return pc, cmn.ErrorWrap(err, err2.Error())
 		}
@@ -187,17 +184,15 @@ func newPeerConn(rawConn net.Conn,
 		conn = FuzzConnAfterFromConfig(conn, 10*time.Second, config.FuzzConfig)
 	}
 
-	if config.AuthEnc {
-		// Set deadline for secret handshake
-		if err := conn.SetDeadline(time.Now().Add(config.HandshakeTimeout * time.Second)); err != nil {
-			return pc, cmn.ErrorWrap(err, "Error setting deadline while encrypting connection")
-		}
+	// Set deadline for secret handshake
+	if err := conn.SetDeadline(time.Now().Add(config.HandshakeTimeout * time.Second)); err != nil {
+		return pc, cmn.ErrorWrap(err, "Error setting deadline while encrypting connection")
+	}
 
-		// Encrypt connection
-		conn, err = tmconn.MakeSecretConnection(conn, ourNodePrivKey)
-		if err != nil {
-			return pc, cmn.ErrorWrap(err, "Error creating peer")
-		}
+	// Encrypt connection
+	conn, err = tmconn.MakeSecretConnection(conn, ourNodePrivKey)
+	if err != nil {
+		return pc, cmn.ErrorWrap(err, "Error creating peer")
 	}
 
 	// Only the information we already have

p2p/peer_test.go

@@ -41,32 +41,10 @@ func TestPeerBasic(t *testing.T) {
 	assert.Equal(rp.ID(), p.ID())
 }
 
-func TestPeerWithoutAuthEnc(t *testing.T) {
-	assert, require := assert.New(t), require.New(t)
-
-	config := DefaultPeerConfig()
-	config.AuthEnc = false
-
-	// simulate remote peer
-	rp := &remotePeer{PrivKey: crypto.GenPrivKeyEd25519(), Config: config}
-	rp.Start()
-	defer rp.Stop()
-
-	p, err := createOutboundPeerAndPerformHandshake(rp.Addr(), config)
-	require.Nil(err)
-
-	err = p.Start()
-	require.Nil(err)
-	defer p.Stop()
-
-	assert.True(p.IsRunning())
-}
-
 func TestPeerSend(t *testing.T) {
 	assert, require := assert.New(t), require.New(t)
 
 	config := DefaultPeerConfig()
-	config.AuthEnc = false
 
 	// simulate remote peer
 	rp := &remotePeer{PrivKey: crypto.GenPrivKeyEd25519(), Config: config}

p2p/switch.go

@@ -95,7 +95,6 @@ func NewSwitch(config *cfg.P2PConfig) *Switch {
 	sw.peerConfig.MConfig.SendRate = config.SendRate
 	sw.peerConfig.MConfig.RecvRate = config.RecvRate
 	sw.peerConfig.MConfig.MaxPacketMsgPayloadSize = config.MaxPacketMsgPayloadSize
-	sw.peerConfig.AuthEnc = config.AuthEnc
 
 	sw.BaseService = *cmn.NewBaseService(nil, "P2P Switch", sw)
 	return sw
@@ -534,10 +533,6 @@ func (sw *Switch) addPeer(pc peerConn) error {
 		return err
 	}
 
-	// NOTE: if AuthEnc==false, we don't have a peerID until after the handshake.
-	// If AuthEnc==true then we already know the ID and could do the checks first before the handshake,
-	// but it's simple to just deal with both cases the same after the handshake.
-
 	// Exchange NodeInfo on the conn
 	peerNodeInfo, err := pc.HandshakeTimeout(sw.nodeInfo, time.Duration(sw.peerConfig.HandshakeTimeout*time.Second))
 	if err != nil {
@@ -547,13 +542,14 @@ func (sw *Switch) addPeer(pc peerConn) error {
 	peerID := peerNodeInfo.ID
 
 	// ensure connection key matches self reported key
-	if pc.config.AuthEnc {
-		connID := pc.ID()
+	connID := pc.ID()
 
-		if peerID != connID {
-			return fmt.Errorf("nodeInfo.ID() (%v) doesn't match conn.ID() (%v)",
-				peerID, connID)
-		}
+	if peerID != connID {
+		return fmt.Errorf(
+			"nodeInfo.ID() (%v) doesn't match conn.ID() (%v)",
+			peerID,
+			connID,
+		)
 	}
 
 	// Validate the peers nodeInfo