Flexible proxy configurations

cmd/commands/main.go

@@ -212,13 +212,14 @@ func getClientConn(ctx *cli.Context, skipMacaroons bool) *grpc.ClientConn {
 	// to connect to the grpc server.
 	if ctx.GlobalIsSet("socksproxy") {
 		socksProxy := ctx.GlobalString("socksproxy")
+		torNet := &tor.ClearNet{
+			SOCKS: socksProxy,
+		}
+
 		torDialer := func(_ context.Context, addr string) (net.Conn,
 			error) {
 
-			return tor.Dial(
-				addr, socksProxy, false, false,
-				tor.DefaultConnTimeout,
-			)
+			return torNet.Dial("tcp", addr, tor.DefaultConnTimeout)
 		}
 		opts = append(opts, grpc.WithContextDialer(torDialer))
 	} else {

config.go

@@ -44,6 +44,7 @@
 	"github.com/lightningnetwork/lnd/routing"
 	"github.com/lightningnetwork/lnd/signal"
 	"github.com/lightningnetwork/lnd/tor"
+	"golang.org/x/net/proxy"
 )
 
 const (
@@ -76,12 +77,16 @@
 	defaultLetsEncryptDirname            = "letsencrypt"
 	defaultLetsEncryptListen             = ":80"
 
+	defaultNetSOCKS          = ""
+	defaultNetNoProxyTargets = "localhost,::1/128,127.0.0.0/8"
+
 	defaultTorSOCKSPort            = 9050
 	defaultTorDNSHost              = "soa.nodes.lightning.directory"
 	defaultTorDNSPort              = 53
 	defaultTorControlPort          = 9051
 	defaultTorV2PrivateKeyFilename = "v2_onion_private_key"
 	defaultTorV3PrivateKeyFilename = "v3_onion_private_key"
+	defaultTorNoProxyTargets       = "localhost,::1/128,127.0.0.0/8"
 
 	// defaultZMQReadDeadline is the default read deadline to be used for
 	// both the block and tx ZMQ subscriptions.
@@ -356,6 +361,8 @@
 	MinBackoff        time.Duration `long:"minbackoff" description:"Shortest backoff when reconnecting to persistent peers. Valid time units are {s, m, h}."`
 	MaxBackoff        time.Duration `long:"maxbackoff" description:"Longest backoff when reconnecting to persistent peers. Valid time units are {s, m, h}."`
 	ConnectionTimeout time.Duration `long:"connectiontimeout" description:"The timeout value for network connections. Valid time units are {ms, s, m, h}."`
+	SOCKS             string        `long:"socks" description:"The SOCKS5 proxy to use for any outbound connections not going over Tor with format [user:pass]@host:port"`
+	NoProxyTargets    []string      `long:"no-proxy-targets" description:"Specify a target that should bypass the configured proxy. Each value is either an IP address, a CIDR range, a zone (*.example.com) or a hostname (localhost). A best effort is made to parse the string and errors are ignored. Can be specified multiple times. (default: localhost,127.0.0.0/8,::1/128)"`
 
 	DebugLevel string `short:"d" long:"debuglevel" description:"Logging level for all subsystems {trace, debug, info, warn, error, critical} -- You may also specify <global-level>,<subsystem>=<level>,<subsystem2>=<level>,... to set the log level for individual subsystems -- Use show to list available subsystems"`
 
@@ -655,11 +662,15 @@
 		NumGraphSyncPeers:             defaultMinPeers,
 		HistoricalSyncInterval:        discovery.DefaultHistoricalSyncInterval,
 		Tor: &lncfg.Tor{
-			SOCKS:   defaultTorSOCKS,
-			DNS:     defaultTorDNS,
-			Control: defaultTorControl,
+			SOCKS:          defaultTorSOCKS,
+			DNS:            defaultTorDNS,
+			Control:        defaultTorControl,
+			NoProxyTargets: strings.Split(defaultTorNoProxyTargets, ","),
+		},
+		net: &tor.ClearNet{
+			SOCKS:          defaultNetSOCKS,
+			NoProxyTargets: defaultNetNoProxyTargets,
 		},
-		net: &tor.ClearNet{},
 		Workers: &lncfg.Workers{
 			Read:  lncfg.DefaultReadWorkers,
 			Write: lncfg.DefaultWriteWorkers,
@@ -1113,15 +1124,35 @@
 			cfg.MaxCommitFeeRateAnchors)
 	}
 
+	socksAuth := &proxy.Auth{}
+	if cfg.SOCKS != "" {
+		socksAddress := cfg.SOCKS
+		if strings.Contains(socksAddress, "@") {
+			parts := strings.Split(socksAddress, "@")
+			socksAddress = parts[1]
+			creds := strings.Split(parts[0], ":")
+			socksAuth.User = creds[0]
+			socksAuth.Password = creds[1]
+		}
+		socks, err := lncfg.ParseAddressString(
+			socksAddress, "",
+			cfg.net.ResolveTCPAddr,
+		)
+		if err != nil {
+			return nil, err
+		}
+		cfg.SOCKS = socks.String()
+	}
+
 	// Validate the Tor config parameters.
-	socks, err := lncfg.ParseAddressString(
+	torSocks, err := lncfg.ParseAddressString(
 		cfg.Tor.SOCKS, strconv.Itoa(defaultTorSOCKSPort),
 		cfg.net.ResolveTCPAddr,
 	)
 	if err != nil {
 		return nil, err
 	}
-	cfg.Tor.SOCKS = socks.String()
+	cfg.Tor.SOCKS = torSocks.String()
 
 	// We'll only attempt to normalize and resolve the DNS host if it hasn't
 	// changed, as it doesn't need to be done for the default.
@@ -1172,7 +1203,7 @@
 			cfg.Tor.PrivateKeyPath = filepath.Join(
 				lndDir, defaultTorV3PrivateKeyFilename,
 			)
 		}
 	}
 
 	if cfg.Tor.WatchtowerKeyPath == "" {
@@ -1195,13 +1226,34 @@
 	// default. If we should be proxying all traffic through Tor, then
 	// we'll use the Tor proxy specific functions in order to avoid leaking
 	// our real information.
+
+	clearNet := &tor.ClearNet{
+		SOCKS:          cfg.SOCKS,
+		SOCKSAuth:      socksAuth,
+		NoProxyTargets: strings.Join(cfg.NoProxyTargets, ","),
+	}
 	if cfg.Tor.Active {
-		cfg.net = &tor.ProxyNet{
-			SOCKS:                       cfg.Tor.SOCKS,
-			DNS:                         cfg.Tor.DNS,
-			StreamIsolation:             cfg.Tor.StreamIsolation,
-			SkipProxyForClearNetTargets: cfg.Tor.SkipProxyForClearNetTargets,
+		torNet := &tor.ProxyNet{
+			SOCKS:           cfg.Tor.SOCKS,
+			DNS:             cfg.Tor.DNS,
+			StreamIsolation: cfg.Tor.StreamIsolation,
+			NoProxyTargets: strings.Join(
+				cfg.Tor.NoProxyTargets, ","),
+			ClearNet: clearNet,
 		}
+		if !cfg.Tor.SkipProxyForClearNetTargets {
+			torNet.ClearNet = &tor.ProxyNet{
+				SOCKS:           cfg.Tor.SOCKS,
+				DNS:             cfg.Tor.DNS,
+				StreamIsolation: cfg.Tor.StreamIsolation,
+				NoProxyTargets: strings.Join(
+					cfg.Tor.NoProxyTargets, ","),
+				ClearNet: clearNet,
+			}
+		}
+		cfg.net = torNet
+	} else {
+		cfg.net = clearNet
 	}
 
 	if cfg.DisableListen && cfg.NAT {

go.mod

@@ -181,7 +181,7 @@ require (
 	go.uber.org/multierr v1.6.0 // indirect
 	go.uber.org/zap v1.17.0 // indirect
 	golang.org/x/mod v0.17.0 // indirect
-	golang.org/x/net v0.39.0 // indirect
+	golang.org/x/net v0.39.0
 	golang.org/x/sys v0.32.0 // indirect
 	golang.org/x/text v0.24.0 // indirect
 	golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d // indirect
@@ -213,6 +213,12 @@ replace github.com/gogo/protobuf => github.com/gogo/protobuf v1.3.2
 // allows us to specify that as an option.
 replace google.golang.org/protobuf => github.com/lightninglabs/protobuf-go-hex-display v1.33.0-hex-display
 
+// Temporary replace until the next version of tor is tagged.
+replace (
+	github.com/lightningnetwork/lnd/tor v0.0.0-local => ./tor
+	github.com/lightningnetwork/lnd/tor v1.1.6 => ./tor
+)
+
 // If you change this please also update docs/INSTALL.md and GO_VERSION in
 // Makefile (then run `make lint` to see where else it needs to be updated as
 // well).

go.sum

@@ -388,8 +388,6 @@ github.com/lightningnetwork/lnd/ticker v1.1.1 h1:J/b6N2hibFtC7JLV77ULQp++QLtCwT6
 github.com/lightningnetwork/lnd/ticker v1.1.1/go.mod h1:waPTRAAcwtu7Ji3+3k+u/xH5GHovTsCoSVpho0KDvdA=
 github.com/lightningnetwork/lnd/tlv v1.3.2 h1:MO4FCk7F4k5xPMqVZF6Nb/kOpxlwPrUQpYjmyKny5s0=
 github.com/lightningnetwork/lnd/tlv v1.3.2/go.mod h1:pJuiBj1ecr1WWLOtcZ+2+hu9Ey25aJWFIsjmAoPPnmc=
-github.com/lightningnetwork/lnd/tor v1.1.6 h1:WHUumk7WgU6BUFsqHuqszI9P6nfhMeIG+rjJBlVE6OE=
-github.com/lightningnetwork/lnd/tor v1.1.6/go.mod h1:qSRB8llhAK+a6kaTPWOLLXSZc6Hg8ZC0mq1sUQ/8JfI=
 github.com/ltcsuite/ltcd v0.0.0-20190101042124-f37f8bf35796 h1:sjOGyegMIhvgfq5oaue6Td+hxZuf3tDC8lAPrFldqFw=
 github.com/ltcsuite/ltcd v0.0.0-20190101042124-f37f8bf35796/go.mod h1:3p7ZTf9V1sNPI5H8P3NkTFF4LuwMdPl2DodF60qAKqY=
 github.com/ltcsuite/ltcutil v0.0.0-20181217130922-17f3b04680b6/go.mod h1:8Vg/LTOO0KYa/vlHWJ6XZAevPQThGH5sufO0Hrou/lA=

lncfg/tor.go

@@ -4,17 +4,18 @@ package lncfg
 //
 //nolint:ll
 type Tor struct {
-	Active                      bool   `long:"active" description:"Allow outbound and inbound connections to be routed through Tor"`
-	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."`
-	SkipProxyForClearNetTargets bool   `long:"skip-proxy-for-clearnet-targets" 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."`
-	V2                          bool   `long:"v2" description:"DEPRECATED: Tor v2 onion services are obsolete and support will be removed in v0.21.0. Use v3 instead." hidden:"true"`
-	V3                          bool   `long:"v3" description:"Automatically set up a v3 onion service to listen for inbound connections"`
-	PrivateKeyPath              string `long:"privatekeypath" description:"The path to the private key of the onion service being created"`
-	EncryptKey                  bool   `long:"encryptkey" description:"Encrypts the Tor private key file on disk"`
-	WatchtowerKeyPath           string `long:"watchtowerkeypath" description:"The path to the private key of the watchtower onion service being created"`
+	Active                      bool     `long:"active" description:"Allow outbound and inbound connections to be routed through Tor"`
+	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."`
+	SkipProxyForClearNetTargets bool     `long:"skip-proxy-for-clearnet-targets" description:"Allow the node to establish direct connections to services not running behind Tor."`
+	NoProxyTargets              []string `long:"no-proxy-targets" description:"Specify a target that should bypass the configured proxy. Each value is either an IP address, a CIDR range, a zone (*.example.com) or a hostname (localhost). A best effort is made to parse the string and errors are ignored. Can be specified multiple times. (default: localhost,127.0.0.0/8,::1/128)"`
+	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."`
+	V2                          bool     `long:"v2" description:"DEPRECATED: Tor v2 onion services are obsolete and support will be removed in v0.21.0. Use v3 instead." hidden:"true"`
+	V3                          bool     `long:"v3" description:"Automatically set up a v3 onion service to listen for inbound connections"`
+	PrivateKeyPath              string   `long:"privatekeypath" description:"The path to the private key of the onion service being created"`
+	EncryptKey                  bool     `long:"encryptkey" description:"Encrypts the Tor private key file on disk"`
+	WatchtowerKeyPath           string   `long:"watchtowerkeypath" description:"The path to the private key of the watchtower onion service being created"`
 }

lnd.go

@@ -137,10 +137,6 @@ type ListenerCfg struct {
 	RPCListeners []*ListenerWithSignal
 }
 
-var errStreamIsolationWithProxySkip = errors.New(
-	"while stream isolation is enabled, the TOR proxy may not be skipped",
-)
-
 // 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
@@ -514,20 +510,19 @@ func Main(cfg *Config, lisCfg ListenerCfg, implCfg *ImplementationCfg,
 	}
 
 	if cfg.Tor.StreamIsolation && cfg.Tor.SkipProxyForClearNetTargets {
-		return errStreamIsolationWithProxySkip
+		srvrLog.Warn(
+			"Danger! Skipping Tor while Stream Isolation is on." +
+				"This has high risk of leaking your IP. " +
+				"Make sure this is what you want.")
 	}
 
 	if cfg.Tor.Active {
-		if cfg.Tor.SkipProxyForClearNetTargets {
-			srvrLog.InfoS(ctx, "Onion services are accessible "+
-				"via Tor! NOTE: Traffic to clearnet services "+
-				"is not routed via Tor.")
-		} else {
-			srvrLog.InfoS(ctx, "Proxying all network traffic "+
-				"via Tor! NOTE: Ensure the backend node is "+
-				"proxying over Tor as well",
-				"stream_isolation", cfg.Tor.StreamIsolation)
-		}
+		srvrLog.InfoS(ctx, "Proxying all network traffic "+
+			"via Tor! NOTE: Ensure the backend node is "+
+			"proxying over Tor as well",
+			"tor_no_proxy_targets", strings.Join(cfg.Tor.NoProxyTargets, ","),
+			"no_proxy_targets", strings.Join(cfg.NoProxyTargets, ","),
+			"stream_isolation", cfg.Tor.StreamIsolation)
 	}
 
 	// If tor is active and either v2 or v3 onion services have been

sample-lnd.conf

@@ -234,6 +234,24 @@
 ; support devices behind multiple NATs.
 ; nat=false
 
+; The host:port of SOCKS5 proxy to use for any outbound connections not
+; going over Tor.
+; Example:
+;   socks=proxyuser:proxypassword@127.0.0.1:8888
+; Default:
+;   socks=
+
+; Specify a target that should bypass the clearnet proxy.
+; Each value is either an IP address, a CIDR range, a zone (*.example.com) or a
+; host name (localhost). A best effort is made to parse the string and errors
+; are ignored.
+; Default:
+;   no-proxy-targets=localhost
+;   no-proxy-targets=127.0.0.0/8
+;   no-proxy-targets=::1/128
+; Example (option can be specified multiple times):
+;   no-proxy-targets=192.168.0.0/16
+
 ; Disable REST API.
 ; norest=false
 
@@ -959,6 +977,18 @@
 ; be used only if privacy is not a concern.
 ; tor.skip-proxy-for-clearnet-targets=false
 
+; Specify a target that should not be routed over Tor.
+; Each value is either an
+; IP address, a CIDR range, a zone (*.example.com) or a host name
+; (localhost). A best effort is made to parse the string and errors are
+; ignored.
+; Default:
+;   tor.no-proxy-targets=localhost
+;   tor.no-proxy-targets=127.0.0.0/8
+;   tor.no-proxy-targets=::1/128
+; Example (option can be specified multiple times):
+;   tor.no-proxy-targets=192.168.0.0/16
+
 ; The port that Tor's exposed SOCKS5 proxy is listening on. Using Tor allows
 ; outbound-only connections (listening will be disabled) -- NOTE port must be
 ; between 1024 and 65535.

scripts/check-sample-lnd-conf.sh

@@ -59,7 +59,7 @@ OPTIONS_NO_LND_DEFAULT_VALUE_CHECK="channel-max-fee-exposure adminmacaroonpath \
     backupfilepath maxchansize bitcoin.chaindir bitcoin.defaultchanconfs \
     bitcoin.defaultremotedelay bitcoin.dnsseed signrpc.signermacaroonpath \
     walletrpc.walletkitmacaroonpath chainrpc.notifiermacaroonpath \
-    routerrpc.routermacaroonpath" 
+    routerrpc.routermacaroonpath no-proxy-targets tor.no-proxy-targets"
 
 
 # EXITCODE is returned at the end after all checks are performed and set to 1