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tsnet: add test for packet filter generation from netmap
This is an integration test that covers all the code in Direct, Auto, and LocalBackend that processes NetMaps and creates a Filter. The test uses tsnet as a convenient proxy for setting up all the client pieces correctly, but is not actually a test specific to tsnet. Updates tailscale/corp#20514 Signed-off-by: James Sanderson <jsanderson@tailscale.com>
This commit is contained in:
James Sanderson
parent
3a2c92f08e
commit
a3c265e9be
234
tsnet/packet_filter_test.go
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234
tsnet/packet_filter_test.go
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package tsnet
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import (
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"context"
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"fmt"
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"net/netip"
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"testing"
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"time"
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"tailscale.com/ipn"
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"tailscale.com/tailcfg"
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"tailscale.com/types/ipproto"
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"tailscale.com/types/key"
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"tailscale.com/types/netmap"
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"tailscale.com/util/must"
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"tailscale.com/wgengine/filter"
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)
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// waitFor blocks until a NetMap is seen on the IPN bus that satisfies the given
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// function f. Note: has no timeout, should be called with a ctx that has an
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// appropriate timeout set.
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func waitFor(t testing.TB, ctx context.Context, s *Server, f func(*netmap.NetworkMap) bool) error {
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t.Helper()
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t.Log("starting waitFor")
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watcher, err := s.localClient.WatchIPNBus(ctx, ipn.NotifyInitialNetMap)
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if err != nil {
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t.Fatalf("error watching IPN bus: %s", err)
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}
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defer watcher.Close()
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for {
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n, err := watcher.Next()
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if err != nil {
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return fmt.Errorf("getting next ipn.Notify from IPN bus: %w", err)
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}
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if n.NetMap != nil {
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if f(n.NetMap) {
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return nil
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}
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}
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}
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}
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// TestPacketFilterFromNetmap tests all of the client code for processing
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// netmaps and turning them into packet filters together. Only the control-plane
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// side is mocked out.
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func TestPacketFilterFromNetmap(t *testing.T) {
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t.Parallel()
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var key key.NodePublic
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must.Do(key.UnmarshalText([]byte("nodekey:5c8f86d5fc70d924e55f02446165a5dae8f822994ad26bcf4b08fd841f9bf261")))
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type check struct {
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src string
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dst string
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port uint16
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want filter.Response
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}
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tests := []struct {
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name string
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initialNetMap *tailcfg.MapResponse
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initialWaitTest func(*netmap.NetworkMap) bool
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incrementalNetMap *tailcfg.MapResponse // optional
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incrementalWaitTest func(*netmap.NetworkMap) bool // optional
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checks []check
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}{
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{
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name: "IP_based_peers",
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initialNetMap: &tailcfg.MapResponse{
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Node: &tailcfg.Node{
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Addresses: []netip.Prefix{netip.MustParsePrefix("1.1.1.1/32")},
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},
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Peers: []*tailcfg.Node{{
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ID: 2,
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Name: "foo",
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Key: key,
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Addresses: []netip.Prefix{netip.MustParsePrefix("2.2.2.2/32")},
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CapMap: nil,
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}},
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PacketFilter: []tailcfg.FilterRule{{
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SrcIPs: []string{"2.2.2.2/32"},
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DstPorts: []tailcfg.NetPortRange{{
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IP: "1.1.1.1/32",
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Ports: tailcfg.PortRange{
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First: 22,
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Last: 22,
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},
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}},
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IPProto: []int{int(ipproto.TCP)},
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}},
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},
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initialWaitTest: func(nm *netmap.NetworkMap) bool {
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return len(nm.Peers) > 0
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},
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checks: []check{
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{src: "2.2.2.2", dst: "1.1.1.1", port: 22, want: filter.Accept},
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{src: "2.2.2.2", dst: "1.1.1.1", port: 23, want: filter.Drop}, // different port
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{src: "3.3.3.3", dst: "1.1.1.1", port: 22, want: filter.Drop}, // different src
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{src: "2.2.2.2", dst: "1.1.1.2", port: 22, want: filter.Drop}, // different dst
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},
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},
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{
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name: "capmap_based_peers",
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initialNetMap: &tailcfg.MapResponse{
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Node: &tailcfg.Node{
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Addresses: []netip.Prefix{netip.MustParsePrefix("1.1.1.1/32")},
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},
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Peers: []*tailcfg.Node{{
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ID: 2,
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Name: "foo",
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Key: key,
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Addresses: []netip.Prefix{netip.MustParsePrefix("2.2.2.2/32")},
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CapMap: tailcfg.NodeCapMap{"X": nil},
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}},
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PacketFilter: []tailcfg.FilterRule{{
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SrcIPs: []string{"cap:X"},
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DstPorts: []tailcfg.NetPortRange{{
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IP: "1.1.1.1/32",
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Ports: tailcfg.PortRange{
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First: 22,
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Last: 22,
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},
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}},
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IPProto: []int{int(ipproto.TCP)},
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}},
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},
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initialWaitTest: func(nm *netmap.NetworkMap) bool {
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return len(nm.Peers) > 0
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},
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checks: []check{
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{src: "2.2.2.2", dst: "1.1.1.1", port: 22, want: filter.Accept},
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{src: "2.2.2.2", dst: "1.1.1.1", port: 23, want: filter.Drop}, // different port
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{src: "3.3.3.3", dst: "1.1.1.1", port: 22, want: filter.Drop}, // different src
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{src: "2.2.2.2", dst: "1.1.1.2", port: 22, want: filter.Drop}, // different dst
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},
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},
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{
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name: "capmap_based_peers_changed",
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initialNetMap: &tailcfg.MapResponse{
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Node: &tailcfg.Node{
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Addresses: []netip.Prefix{netip.MustParsePrefix("1.1.1.1/32")},
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CapMap: tailcfg.NodeCapMap{"X-sigil": nil},
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},
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PacketFilter: []tailcfg.FilterRule{{
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SrcIPs: []string{"cap:label-1"},
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DstPorts: []tailcfg.NetPortRange{{
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IP: "1.1.1.1/32",
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Ports: tailcfg.PortRange{
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First: 22,
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Last: 22,
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},
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}},
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IPProto: []int{int(ipproto.TCP)},
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}},
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},
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initialWaitTest: func(nm *netmap.NetworkMap) bool {
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return nm.SelfNode.HasCap("X-sigil")
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},
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incrementalNetMap: &tailcfg.MapResponse{
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PeersChanged: []*tailcfg.Node{{
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ID: 2,
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Name: "foo",
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Key: key,
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Addresses: []netip.Prefix{netip.MustParsePrefix("2.2.2.2/32")},
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CapMap: tailcfg.NodeCapMap{"label-1": nil},
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}},
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},
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incrementalWaitTest: func(nm *netmap.NetworkMap) bool {
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return len(nm.Peers) > 0
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},
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checks: []check{
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{src: "2.2.2.2", dst: "1.1.1.1", port: 22, want: filter.Accept},
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{src: "2.2.2.2", dst: "1.1.1.1", port: 23, want: filter.Drop}, // different port
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{src: "3.3.3.3", dst: "1.1.1.1", port: 22, want: filter.Drop}, // different src
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{src: "2.2.2.2", dst: "1.1.1.2", port: 22, want: filter.Drop}, // different dst
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},
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},
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}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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t.Parallel()
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ctx, cancel := context.WithTimeout(t.Context(), 30*time.Second)
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defer cancel()
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controlURL, c := startControl(t)
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s, _, pubKey := startServer(t, ctx, controlURL, "node")
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if test.initialWaitTest(s.lb.NetMap()) {
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t.Fatal("initialWaitTest already passes before sending initial netmap: this will be flaky")
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}
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if !c.AddRawMapResponse(pubKey, test.initialNetMap) {
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t.Fatalf("could not send map response to %s", pubKey)
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}
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if err := waitFor(t, ctx, s, test.initialWaitTest); err != nil {
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t.Fatalf("waitFor: %s", err)
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}
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if test.incrementalNetMap != nil {
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if test.incrementalWaitTest == nil {
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t.Fatal("incrementalWaitTest must be set if incrementalNetMap is set")
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}
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if test.incrementalWaitTest(s.lb.NetMap()) {
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t.Fatal("incrementalWaitTest already passes before sending incremental netmap: this will be flaky")
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}
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if !c.AddRawMapResponse(pubKey, test.incrementalNetMap) {
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t.Fatalf("could not send map response to %s", pubKey)
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}
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if err := waitFor(t, ctx, s, test.incrementalWaitTest); err != nil {
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t.Fatalf("waitFor: %s", err)
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}
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}
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pf := s.lb.GetFilterForTest()
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for _, check := range test.checks {
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got := pf.Check(netip.MustParseAddr(check.src), netip.MustParseAddr(check.dst), check.port, ipproto.TCP)
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if got != check.want {
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t.Errorf("check %s -> %s:%d, got: %s, want: %s", check.src, check.dst, check.port, got, check.want)
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}
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}
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})
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}
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}
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