ipn: use NodeCapMap in CheckFunnel

These were missed when adding NodeCapMap and resulted
in tsnet binaries not being able to turn on funnel.

Fixes #9566

Signed-off-by: Maisem Ali <maisem@tailscale.com>

cmd/derper/depaware.txt

@@ -270,7 +270,7 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
         runtime/metrics                                              from github.com/prometheus/client_golang/prometheus+
         runtime/pprof                                                from net/http/pprof
         runtime/trace                                                from net/http/pprof
-        slices                                                       from tailscale.com/ipn+
+        slices                                                       from tailscale.com/ipn/ipnstate+
         sort                                                         from compress/flate+
         strconv                                                      from compress/flate+
         strings                                                      from bufio+

cmd/tailscale/cli/funnel.go

@@ -164,12 +164,12 @@ func (e *serveEnv) verifyFunnelEnabled(ctx context.Context, st *ipnstate.Status,
 		// the feature flag on.
 		// TODO(sonia,tailscale/corp#10577): Remove this fallback once the
 		// control flag is turned on for all domains.
-		if err := ipn.CheckFunnelAccess(port, st.Self.Capabilities); err != nil {
+		if err := ipn.CheckFunnelAccess(port, st.Self); err != nil {
 			return err
 		}
 	default:
 		// Done with enablement, make sure the requested port is allowed.
-		if err := ipn.CheckFunnelPort(port, st.Self.Capabilities); err != nil {
+		if err := ipn.CheckFunnelPort(port, st.Self); err != nil {
 			return err
 		}
 	}

ipn/serve.go

@@ -9,10 +9,10 @@
 	"net"
 	"net/netip"
 	"net/url"
-	"slices"
 	"strconv"
 	"strings"
 
+	"tailscale.com/ipn/ipnstate"
 	"tailscale.com/tailcfg"
 )
 
@@ -237,23 +237,21 @@ func (sc *ServeConfig) IsFunnelOn() bool {
 //  2. the node has the "funnel" nodeAttr
 //  3. the port is allowed for Funnel
 //
-// The nodeAttrs arg should be the node's Self.Capabilities which should contain
-// the attribute we're checking for and possibly warning-capabilities for
-// Funnel.
-func CheckFunnelAccess(port uint16, nodeAttrs []tailcfg.NodeCapability) error {
-	if !slices.Contains(nodeAttrs, tailcfg.CapabilityHTTPS) {
+// The node arg should be the ipnstate.Status.Self node.
+func CheckFunnelAccess(port uint16, node *ipnstate.PeerStatus) error {
+	if !node.HasCap(tailcfg.CapabilityHTTPS) {
 		return errors.New("Funnel not available; HTTPS must be enabled. See https://tailscale.com/s/https.")
 	}
-	if !slices.Contains(nodeAttrs, tailcfg.NodeAttrFunnel) {
+	if !node.HasCap(tailcfg.NodeAttrFunnel) {
 		return errors.New("Funnel not available; \"funnel\" node attribute not set. See https://tailscale.com/s/no-funnel.")
 	}
-	return CheckFunnelPort(port, nodeAttrs)
+	return CheckFunnelPort(port, node)
 }
 
 // CheckFunnelPort checks whether the given port is allowed for Funnel.
 // It uses the tailcfg.CapabilityFunnelPorts nodeAttr to determine the allowed
 // ports.
-func CheckFunnelPort(wantedPort uint16, nodeAttrs []tailcfg.NodeCapability) error {
+func CheckFunnelPort(wantedPort uint16, node *ipnstate.PeerStatus) error {
 	deny := func(allowedPorts string) error {
 		if allowedPorts == "" {
 			return fmt.Errorf("port %d is not allowed for funnel", wantedPort)
@@ -261,24 +259,50 @@ func CheckFunnelPort(wantedPort uint16, nodeAttrs []tailcfg.NodeCapability) erro
 		return fmt.Errorf("port %d is not allowed for funnel; allowed ports are: %v", wantedPort, allowedPorts)
 	}
 	var portsStr string
-	for _, attr := range nodeAttrs {
+	parseAttr := func(attr string) (string, error) {
+		u, err := url.Parse(attr)
+		if err != nil {
+			return "", deny("")
+		}
+		portsStr := u.Query().Get("ports")
+		if portsStr == "" {
+			return "", deny("")
+		}
+		u.RawQuery = ""
+		if u.String() != string(tailcfg.CapabilityFunnelPorts) {
+			return "", deny("")
+		}
+		return portsStr, nil
+	}
+	for attr := range node.CapMap {
 		attr := string(attr)
 		if !strings.HasPrefix(attr, string(tailcfg.CapabilityFunnelPorts)) {
 			continue
 		}
-		u, err := url.Parse(attr)
+		var err error
+		portsStr, err = parseAttr(attr)
 		if err != nil {
-			return deny("")
+			return err
 		}
-		portsStr = u.Query().Get("ports")
-		if portsStr == "" {
-			return deny("")
-		}
-		u.RawQuery = ""
-		if u.String() != string(tailcfg.CapabilityFunnelPorts) {
-			return deny("")
+		break
+	}
+	if portsStr == "" {
+		for _, attr := range node.Capabilities {
+			attr := string(attr)
+			if !strings.HasPrefix(attr, string(tailcfg.CapabilityFunnelPorts)) {
+				continue
+			}
+			var err error
+			portsStr, err = parseAttr(attr)
+			if err != nil {
+				return err
+			}
+			break
 		}
 	}
+	if portsStr == "" {
+		return deny("")
+	}
 	wantedPortString := strconv.Itoa(int(wantedPort))
 	for _, ps := range strings.Split(portsStr, ",") {
 		if ps == "" {

ipn/serve_test.go

@@ -5,6 +5,7 @@
 import (
 	"testing"
 
+	"tailscale.com/ipn/ipnstate"
 	"tailscale.com/tailcfg"
 )
 
@@ -26,7 +27,11 @@ func TestCheckFunnelAccess(t *testing.T) {
 		{3000, caps(portAttr, tailcfg.CapabilityHTTPS, tailcfg.NodeAttrFunnel), true},
 	}
 	for _, tt := range tests {
-		err := CheckFunnelAccess(tt.port, tt.caps)
+		cm := tailcfg.NodeCapMap{}
+		for _, c := range tt.caps {
+			cm[c] = nil
+		}
+		err := CheckFunnelAccess(tt.port, &ipnstate.PeerStatus{CapMap: cm})
 		switch {
 		case err != nil && tt.wantErr,
 			err == nil && !tt.wantErr:

tsnet/tsnet.go

@@ -926,7 +926,7 @@ func (s *Server) ListenFunnel(network, addr string, opts ...FunnelOption) (net.L
 	// flow here instead of CheckFunnelAccess to allow the user to turn on Funnel
 	// if not already on. Specifically when running from a terminal.
 	// See cli.serveEnv.verifyFunnelEnabled.
-	if err := ipn.CheckFunnelAccess(uint16(port), st.Self.Capabilities); err != nil {
+	if err := ipn.CheckFunnelAccess(uint16(port), st.Self); err != nil {
 		return nil, err
 	}