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361 lines
12 KiB
361 lines
12 KiB
// Copyright (c) Tailscale Inc & contributors
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// SPDX-License-Identifier: BSD-3-Clause
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package conn25
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import (
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"errors"
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"net/netip"
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"testing"
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"tailscale.com/net/packet"
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"tailscale.com/types/ipproto"
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"tailscale.com/wgengine/filter"
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)
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type testConn25 struct {
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clientTransitIPForMagicIPFn func(netip.Addr) (netip.Addr, error)
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connectorRealIPForTransitIPConnectionFn func(netip.Addr, netip.Addr) (netip.Addr, error)
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}
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func (tc *testConn25) ClientTransitIPForMagicIP(magicIP netip.Addr) (netip.Addr, error) {
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return tc.clientTransitIPForMagicIPFn(magicIP)
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}
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func (tc *testConn25) ConnectorRealIPForTransitIPConnection(srcIP netip.Addr, transitIP netip.Addr) (netip.Addr, error) {
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return tc.connectorRealIPForTransitIPConnectionFn(srcIP, transitIP)
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}
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func TestHandlePacketFromTunDevice(t *testing.T) {
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clientSrcIP := netip.MustParseAddr("100.70.0.1")
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magicIP := netip.MustParseAddr("10.64.0.1")
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unusedMagicIP := netip.MustParseAddr("10.64.0.2")
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transitIP := netip.MustParseAddr("169.254.0.1")
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realIP := netip.MustParseAddr("240.64.0.1")
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clientPort := uint16(1234)
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serverPort := uint16(80)
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tests := []struct {
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description string
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p *packet.Parsed
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throwMappingErr bool
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expectedSrc netip.AddrPort
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expectedDst netip.AddrPort
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expectedFilterResponse filter.Response
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}{
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{
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description: "accept-and-nat-new-client-flow-mapped-magic-ip",
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p: &packet.Parsed{
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Src: netip.AddrPortFrom(clientSrcIP, clientPort),
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Dst: netip.AddrPortFrom(magicIP, serverPort),
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},
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expectedSrc: netip.AddrPortFrom(clientSrcIP, clientPort),
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expectedDst: netip.AddrPortFrom(transitIP, serverPort),
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expectedFilterResponse: filter.Accept,
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},
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{
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description: "drop-unmapped-magic-ip",
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p: &packet.Parsed{
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Src: netip.AddrPortFrom(clientSrcIP, clientPort),
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Dst: netip.AddrPortFrom(unusedMagicIP, serverPort),
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},
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expectedSrc: netip.AddrPortFrom(clientSrcIP, clientPort),
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expectedDst: netip.AddrPortFrom(unusedMagicIP, serverPort),
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expectedFilterResponse: filter.Drop,
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},
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{
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description: "accept-dont-nat-other-mapping-error",
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p: &packet.Parsed{
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Src: netip.AddrPortFrom(clientSrcIP, clientPort),
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Dst: netip.AddrPortFrom(magicIP, serverPort),
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},
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throwMappingErr: true,
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expectedSrc: netip.AddrPortFrom(clientSrcIP, clientPort),
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expectedDst: netip.AddrPortFrom(magicIP, serverPort),
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expectedFilterResponse: filter.Accept,
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},
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{
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description: "accept-dont-nat-uninteresting-client-side",
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p: &packet.Parsed{
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Src: netip.AddrPortFrom(clientSrcIP, clientPort),
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Dst: netip.AddrPortFrom(realIP, serverPort),
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},
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expectedSrc: netip.AddrPortFrom(clientSrcIP, clientPort),
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expectedDst: netip.AddrPortFrom(realIP, serverPort),
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expectedFilterResponse: filter.Accept,
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},
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{
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description: "accept-dont-nat-uninteresting-connector-side",
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p: &packet.Parsed{
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Src: netip.AddrPortFrom(realIP, serverPort),
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Dst: netip.AddrPortFrom(clientSrcIP, clientPort),
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},
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expectedSrc: netip.AddrPortFrom(realIP, serverPort),
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expectedDst: netip.AddrPortFrom(clientSrcIP, clientPort),
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expectedFilterResponse: filter.Accept,
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},
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}
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for _, tt := range tests {
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t.Run(tt.description, func(t *testing.T) {
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mock := &testConn25{}
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mock.clientTransitIPForMagicIPFn = func(mip netip.Addr) (netip.Addr, error) {
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if tt.throwMappingErr {
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return netip.Addr{}, errors.New("synthetic mapping error")
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}
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if mip == magicIP {
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return transitIP, nil
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}
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if mip == unusedMagicIP {
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return netip.Addr{}, ErrUnmappedMagicIP
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}
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return netip.Addr{}, nil
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}
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dph := newDatapathHandler(mock, t.Logf)
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tt.p.IPProto = ipproto.UDP
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tt.p.IPVersion = 4
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tt.p.StuffForTesting(40)
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if want, got := tt.expectedFilterResponse, dph.HandlePacketFromTunDevice(tt.p); want != got {
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t.Errorf("unexpected filter response: want %v, got %v", want, got)
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}
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if want, got := tt.expectedSrc, tt.p.Src; want != got {
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t.Errorf("unexpected packet src: want %v, got %v", want, got)
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}
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if want, got := tt.expectedDst, tt.p.Dst; want != got {
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t.Errorf("unexpected packet dst: want %v, got %v", want, got)
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}
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})
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}
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}
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func TestHandlePacketFromWireGuard(t *testing.T) {
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clientSrcIP := netip.MustParseAddr("100.70.0.1")
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unknownSrcIP := netip.MustParseAddr("100.99.99.99")
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transitIP := netip.MustParseAddr("169.254.0.1")
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realIP := netip.MustParseAddr("240.64.0.1")
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clientPort := uint16(1234)
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serverPort := uint16(80)
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tests := []struct {
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description string
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p *packet.Parsed
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throwMappingErr bool
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expectedSrc netip.AddrPort
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expectedDst netip.AddrPort
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expectedFilterResponse filter.Response
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}{
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{
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description: "accept-and-nat-new-connector-flow-mapped-src-and-transit-ip",
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p: &packet.Parsed{
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Src: netip.AddrPortFrom(clientSrcIP, clientPort),
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Dst: netip.AddrPortFrom(transitIP, serverPort),
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},
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expectedSrc: netip.AddrPortFrom(clientSrcIP, clientPort),
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expectedDst: netip.AddrPortFrom(realIP, serverPort),
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expectedFilterResponse: filter.Accept,
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},
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{
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description: "drop-unmapped-src-and-transit-ip",
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p: &packet.Parsed{
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Src: netip.AddrPortFrom(unknownSrcIP, clientPort),
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Dst: netip.AddrPortFrom(transitIP, serverPort),
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},
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expectedSrc: netip.AddrPortFrom(unknownSrcIP, clientPort),
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expectedDst: netip.AddrPortFrom(transitIP, serverPort),
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expectedFilterResponse: filter.Drop,
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},
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{
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description: "accept-dont-nat-other-mapping-error",
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p: &packet.Parsed{
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Src: netip.AddrPortFrom(clientSrcIP, clientPort),
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Dst: netip.AddrPortFrom(transitIP, serverPort),
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},
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throwMappingErr: true,
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expectedSrc: netip.AddrPortFrom(clientSrcIP, clientPort),
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expectedDst: netip.AddrPortFrom(transitIP, serverPort),
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expectedFilterResponse: filter.Accept,
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},
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{
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description: "accept-dont-nat-uninteresting-connector-side",
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p: &packet.Parsed{
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Src: netip.AddrPortFrom(clientSrcIP, clientPort),
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Dst: netip.AddrPortFrom(realIP, serverPort),
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},
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expectedSrc: netip.AddrPortFrom(clientSrcIP, clientPort),
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expectedDst: netip.AddrPortFrom(realIP, serverPort),
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expectedFilterResponse: filter.Accept,
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},
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{
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description: "accept-dont-nat-uninteresting-client-side",
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p: &packet.Parsed{
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Src: netip.AddrPortFrom(realIP, serverPort),
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Dst: netip.AddrPortFrom(clientSrcIP, clientPort),
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},
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expectedSrc: netip.AddrPortFrom(realIP, serverPort),
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expectedDst: netip.AddrPortFrom(clientSrcIP, clientPort),
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expectedFilterResponse: filter.Accept,
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},
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}
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for _, tt := range tests {
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t.Run(tt.description, func(t *testing.T) {
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mock := &testConn25{}
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mock.connectorRealIPForTransitIPConnectionFn = func(src, tip netip.Addr) (netip.Addr, error) {
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if tt.throwMappingErr {
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return netip.Addr{}, errors.New("synthetic mapping error")
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}
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if tip == transitIP {
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if src == clientSrcIP {
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return realIP, nil
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} else {
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return netip.Addr{}, ErrUnmappedSrcAndTransitIP
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}
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}
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return netip.Addr{}, nil
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}
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dph := newDatapathHandler(mock, t.Logf)
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tt.p.IPProto = ipproto.UDP
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tt.p.IPVersion = 4
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tt.p.StuffForTesting(40)
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if want, got := tt.expectedFilterResponse, dph.HandlePacketFromWireGuard(tt.p); want != got {
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t.Errorf("unexpected filter response: want %v, got %v", want, got)
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}
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if want, got := tt.expectedSrc, tt.p.Src; want != got {
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t.Errorf("unexpected packet src: want %v, got %v", want, got)
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}
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if want, got := tt.expectedDst, tt.p.Dst; want != got {
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t.Errorf("unexpected packet dst: want %v, got %v", want, got)
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}
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})
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}
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}
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func TestClientFlowCache(t *testing.T) {
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getTransitIPCalled := false
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clientSrcIP := netip.MustParseAddr("100.70.0.1")
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magicIP := netip.MustParseAddr("10.64.0.1")
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transitIP := netip.MustParseAddr("169.254.0.1")
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clientPort := uint16(1234)
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serverPort := uint16(80)
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mock := &testConn25{}
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mock.clientTransitIPForMagicIPFn = func(mip netip.Addr) (netip.Addr, error) {
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if getTransitIPCalled {
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t.Errorf("ClientGetTransitIPForMagicIP unexpectedly called more than once")
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}
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getTransitIPCalled = true
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return transitIP, nil
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}
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dph := newDatapathHandler(mock, t.Logf)
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outgoing := packet.Parsed{
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IPProto: ipproto.UDP,
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IPVersion: 4,
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Src: netip.AddrPortFrom(clientSrcIP, clientPort),
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Dst: netip.AddrPortFrom(magicIP, serverPort),
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}
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outgoing.StuffForTesting(40)
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o1 := outgoing
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if dph.HandlePacketFromTunDevice(&o1) != filter.Accept {
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t.Errorf("first call to HandlePacketFromTunDevice was not accepted")
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}
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if want, got := netip.AddrPortFrom(transitIP, serverPort), o1.Dst; want != got {
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t.Errorf("unexpected packet dst after first call: want %v, got %v", want, got)
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}
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// The second call should use the cache.
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o2 := outgoing
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if dph.HandlePacketFromTunDevice(&o2) != filter.Accept {
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t.Errorf("second call to HandlePacketFromTunDevice was not accepted")
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}
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if want, got := netip.AddrPortFrom(transitIP, serverPort), o2.Dst; want != got {
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t.Errorf("unexpected packet dst after second call: want %v, got %v", want, got)
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}
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// Return traffic should have the Transit IP as the source,
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// and be SNATed to the Magic IP.
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incoming := &packet.Parsed{
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IPProto: ipproto.UDP,
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IPVersion: 4,
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Src: netip.AddrPortFrom(transitIP, serverPort),
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Dst: netip.AddrPortFrom(clientSrcIP, clientPort),
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}
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incoming.StuffForTesting(40)
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if dph.HandlePacketFromWireGuard(incoming) != filter.Accept {
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t.Errorf("call to HandlePacketFromWireGuard was not accepted")
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}
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if want, got := netip.AddrPortFrom(magicIP, serverPort), incoming.Src; want != got {
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t.Errorf("unexpected packet src after second call: want %v, got %v", want, got)
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}
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}
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func TestConnectorFlowCache(t *testing.T) {
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getRealIPCalled := false
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clientSrcIP := netip.MustParseAddr("100.70.0.1")
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transitIP := netip.MustParseAddr("169.254.0.1")
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realIP := netip.MustParseAddr("240.64.0.1")
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clientPort := uint16(1234)
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serverPort := uint16(80)
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mock := &testConn25{}
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mock.connectorRealIPForTransitIPConnectionFn = func(src, tip netip.Addr) (netip.Addr, error) {
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if getRealIPCalled {
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t.Errorf("ConnectorRealIPForTransitIPConnection unexpectedly called more than once")
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}
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getRealIPCalled = true
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return realIP, nil
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}
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dph := newDatapathHandler(mock, t.Logf)
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outgoing := packet.Parsed{
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IPProto: ipproto.UDP,
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IPVersion: 4,
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Src: netip.AddrPortFrom(clientSrcIP, clientPort),
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Dst: netip.AddrPortFrom(transitIP, serverPort),
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}
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outgoing.StuffForTesting(40)
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o1 := outgoing
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if dph.HandlePacketFromWireGuard(&o1) != filter.Accept {
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t.Errorf("first call to HandlePacketFromWireGuard was not accepted")
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}
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if want, got := netip.AddrPortFrom(realIP, serverPort), o1.Dst; want != got {
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t.Errorf("unexpected packet dst after first call: want %v, got %v", want, got)
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}
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// The second call should use the cache.
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o2 := outgoing
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if dph.HandlePacketFromWireGuard(&o2) != filter.Accept {
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t.Errorf("second call to HandlePacketFromWireGuard was not accepted")
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}
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if want, got := netip.AddrPortFrom(realIP, serverPort), o2.Dst; want != got {
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t.Errorf("unexpected packet dst after second call: want %v, got %v", want, got)
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}
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// Return traffic should have the Real IP as the source,
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// and be SNATed to the Transit IP.
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incoming := &packet.Parsed{
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IPProto: ipproto.UDP,
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IPVersion: 4,
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Src: netip.AddrPortFrom(realIP, serverPort),
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Dst: netip.AddrPortFrom(clientSrcIP, clientPort),
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}
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incoming.StuffForTesting(40)
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if dph.HandlePacketFromTunDevice(incoming) != filter.Accept {
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t.Errorf("call to HandlePacketFromTunDevice was not accepted")
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}
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if want, got := netip.AddrPortFrom(transitIP, serverPort), incoming.Src; want != got {
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t.Errorf("unexpected packet src after second call: want %v, got %v", want, got)
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}
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}
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