config+lnd: Update Tor configuration for hybrid node mode

config.go

@@ -909,6 +909,7 @@ func ValidateConfig(cfg Config, usageMessage string,
 			SOCKS:             cfg.Tor.SOCKS,
 			DNS:               cfg.Tor.DNS,
 			StreamIsolation:   cfg.Tor.StreamIsolation,
+			DirectConnections: cfg.Tor.DirectConnections,
 		}
 	}
 
@@ -1316,7 +1317,7 @@ func ValidateConfig(cfg Config, usageMessage string,
 	// connections.
 	if len(cfg.RawListeners) == 0 {
 		addr := fmt.Sprintf(":%d", defaultPeerPort)
-		if cfg.Tor.Active {
+		if cfg.Tor.Active && !cfg.Tor.DirectConnections {
 			addr = fmt.Sprintf("localhost:%d", defaultPeerPort)
 		}
 		cfg.RawListeners = append(cfg.RawListeners, addr)

lncfg/tor.go

@@ -6,6 +6,7 @@ type Tor struct {
 	SOCKS             string `long:"socks" description:"The host:port that Tor's exposed SOCKS5 proxy is listening on"`
 	DNS               string `long:"dns" description:"The DNS server as host:port that Tor will use for SRV queries - NOTE must have TCP resolution enabled"`
 	StreamIsolation   bool   `long:"streamisolation" description:"Enable Tor stream isolation by randomizing user credentials for each connection."`
+	DirectConnections bool   `long:"directconnections" description:"Allow the node to establish direct connections to services not running behind Tor."`
 	Control           string `long:"control" description:"The host:port that Tor is listening on for Tor control connections"`
 	TargetIPAddress   string `long:"targetipaddress" description:"IP address that Tor should use as the target of the hidden service"`
 	Password          string `long:"password" description:"The password used to arrive at the HashedControlPassword for the control port. If provided, the HASHEDPASSWORD authentication method will be used instead of the SAFECOOKIE one."`

lnd.go

@@ -8,6 +8,7 @@ import (
 	"bytes"
 	"context"
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"net"
@@ -168,6 +169,10 @@ type ListenerCfg struct {
 	ExternalRestRegistrar RestRegistrar
 }
 
+var errStreamIsolationWithDirectConnections = errors.New(
+	"direct connections cannot be used while stream isolation is enabled",
+)
+
 // Main is the true entry point for lnd. It accepts a fully populated and
 // validated main configuration struct and an optional listener config struct.
 // This function starts all main system components then blocks until a signal
@@ -752,11 +757,20 @@ func Main(cfg *Config, lisCfg ListenerCfg, interceptor signal.Interceptor) error
 		return err
 	}
 
+	if cfg.Tor.StreamIsolation && cfg.Tor.DirectConnections {
+		return errStreamIsolationWithDirectConnections
+	}
+
 	if cfg.Tor.Active {
+		if cfg.Tor.DirectConnections {
+			srvrLog.Info("Onion services are accessible via Tor! NOTE: " +
+				"Traffic to clearnet services is not routed via Tor.")
+		} else {
 			srvrLog.Infof("Proxying all network traffic via Tor "+
 				"(stream_isolation=%v)! NOTE: Ensure the backend node "+
 				"is proxying over Tor as well", cfg.Tor.StreamIsolation)
 		}
+	}
 
 	// If the watchtower client should be active, open the client database.
 	// This is done here so that Close always executes when lndMain returns.