mirror of https://github.com/tailscale/tailscale/
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
484 lines
10 KiB
Go
484 lines
10 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package tstun
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/binary"
|
|
"fmt"
|
|
"strconv"
|
|
"strings"
|
|
"sync/atomic"
|
|
"testing"
|
|
"unsafe"
|
|
|
|
"github.com/tailscale/wireguard-go/tun/tuntest"
|
|
"inet.af/netaddr"
|
|
"tailscale.com/net/packet"
|
|
"tailscale.com/types/ipproto"
|
|
"tailscale.com/types/logger"
|
|
"tailscale.com/wgengine/filter"
|
|
)
|
|
|
|
func udp4(src, dst string, sport, dport uint16) []byte {
|
|
sip, err := netaddr.ParseIP(src)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
dip, err := netaddr.ParseIP(dst)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
header := &packet.UDP4Header{
|
|
IP4Header: packet.IP4Header{
|
|
Src: sip,
|
|
Dst: dip,
|
|
IPID: 0,
|
|
},
|
|
SrcPort: sport,
|
|
DstPort: dport,
|
|
}
|
|
return packet.Generate(header, []byte("udp_payload"))
|
|
}
|
|
|
|
func tcp4syn(src, dst string, sport, dport uint16) []byte {
|
|
sip, err := netaddr.ParseIP(src)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
dip, err := netaddr.ParseIP(dst)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
ipHeader := packet.IP4Header{
|
|
IPProto: ipproto.TCP,
|
|
Src: sip,
|
|
Dst: dip,
|
|
IPID: 0,
|
|
}
|
|
tcpHeader := make([]byte, 20)
|
|
binary.BigEndian.PutUint16(tcpHeader[0:], sport)
|
|
binary.BigEndian.PutUint16(tcpHeader[2:], dport)
|
|
tcpHeader[13] |= 2 // SYN
|
|
|
|
both := packet.Generate(ipHeader, tcpHeader)
|
|
|
|
// 20 byte IP4 + 20 byte TCP
|
|
binary.BigEndian.PutUint16(both[2:4], 40)
|
|
|
|
return both
|
|
}
|
|
|
|
func nets(nets ...string) (ret []netaddr.IPPrefix) {
|
|
for _, s := range nets {
|
|
if i := strings.IndexByte(s, '/'); i == -1 {
|
|
ip, err := netaddr.ParseIP(s)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
bits := uint8(32)
|
|
if ip.Is6() {
|
|
bits = 128
|
|
}
|
|
ret = append(ret, netaddr.IPPrefix{IP: ip, Bits: bits})
|
|
} else {
|
|
pfx, err := netaddr.ParseIPPrefix(s)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
ret = append(ret, pfx)
|
|
}
|
|
}
|
|
return ret
|
|
}
|
|
|
|
func ports(s string) filter.PortRange {
|
|
if s == "*" {
|
|
return filter.PortRange{First: 0, Last: 65535}
|
|
}
|
|
|
|
var fs, ls string
|
|
i := strings.IndexByte(s, '-')
|
|
if i == -1 {
|
|
fs = s
|
|
ls = fs
|
|
} else {
|
|
fs = s[:i]
|
|
ls = s[i+1:]
|
|
}
|
|
first, err := strconv.ParseInt(fs, 10, 16)
|
|
if err != nil {
|
|
panic(fmt.Sprintf("invalid NetPortRange %q", s))
|
|
}
|
|
last, err := strconv.ParseInt(ls, 10, 16)
|
|
if err != nil {
|
|
panic(fmt.Sprintf("invalid NetPortRange %q", s))
|
|
}
|
|
return filter.PortRange{First: uint16(first), Last: uint16(last)}
|
|
}
|
|
|
|
func netports(netPorts ...string) (ret []filter.NetPortRange) {
|
|
for _, s := range netPorts {
|
|
i := strings.LastIndexByte(s, ':')
|
|
if i == -1 {
|
|
panic(fmt.Sprintf("invalid NetPortRange %q", s))
|
|
}
|
|
|
|
npr := filter.NetPortRange{
|
|
Net: nets(s[:i])[0],
|
|
Ports: ports(s[i+1:]),
|
|
}
|
|
ret = append(ret, npr)
|
|
}
|
|
return ret
|
|
}
|
|
|
|
func setfilter(logf logger.Logf, tun *Wrapper) {
|
|
protos := []ipproto.Proto{
|
|
ipproto.TCP,
|
|
ipproto.UDP,
|
|
}
|
|
matches := []filter.Match{
|
|
{IPProto: protos, Srcs: nets("5.6.7.8"), Dsts: netports("1.2.3.4:89-90")},
|
|
{IPProto: protos, Srcs: nets("1.2.3.4"), Dsts: netports("5.6.7.8:98")},
|
|
}
|
|
var sb netaddr.IPSetBuilder
|
|
sb.AddPrefix(netaddr.MustParseIPPrefix("1.2.0.0/16"))
|
|
tun.SetFilter(filter.New(matches, sb.IPSet(), sb.IPSet(), nil, logf))
|
|
}
|
|
|
|
func newChannelTUN(logf logger.Logf, secure bool) (*tuntest.ChannelTUN, *Wrapper) {
|
|
chtun := tuntest.NewChannelTUN()
|
|
tun := Wrap(logf, chtun.TUN())
|
|
if secure {
|
|
setfilter(logf, tun)
|
|
} else {
|
|
tun.disableFilter = true
|
|
}
|
|
return chtun, tun
|
|
}
|
|
|
|
func newFakeTUN(logf logger.Logf, secure bool) (*fakeTUN, *Wrapper) {
|
|
ftun := NewFake()
|
|
tun := Wrap(logf, ftun)
|
|
if secure {
|
|
setfilter(logf, tun)
|
|
} else {
|
|
tun.disableFilter = true
|
|
}
|
|
return ftun.(*fakeTUN), tun
|
|
}
|
|
|
|
func TestReadAndInject(t *testing.T) {
|
|
chtun, tun := newChannelTUN(t.Logf, false)
|
|
defer tun.Close()
|
|
|
|
const size = 2 // all payloads have this size
|
|
written := []string{"w0", "w1"}
|
|
injected := []string{"i0", "i1"}
|
|
|
|
go func() {
|
|
for _, packet := range written {
|
|
payload := []byte(packet)
|
|
chtun.Outbound <- payload
|
|
}
|
|
}()
|
|
|
|
for _, packet := range injected {
|
|
go func(packet string) {
|
|
payload := []byte(packet)
|
|
err := tun.InjectOutbound(payload)
|
|
if err != nil {
|
|
t.Errorf("%s: error: %v", packet, err)
|
|
}
|
|
}(packet)
|
|
}
|
|
|
|
var buf [MaxPacketSize]byte
|
|
var seen = make(map[string]bool)
|
|
// We expect the same packets back, in no particular order.
|
|
for i := 0; i < len(written)+len(injected); i++ {
|
|
n, err := tun.Read(buf[:], 0)
|
|
if err != nil {
|
|
t.Errorf("read %d: error: %v", i, err)
|
|
}
|
|
if n != size {
|
|
t.Errorf("read %d: got size %d; want %d", i, n, size)
|
|
}
|
|
got := string(buf[:n])
|
|
t.Logf("read %d: got %s", i, got)
|
|
seen[got] = true
|
|
}
|
|
|
|
for _, packet := range written {
|
|
if !seen[packet] {
|
|
t.Errorf("%s not received", packet)
|
|
}
|
|
}
|
|
for _, packet := range injected {
|
|
if !seen[packet] {
|
|
t.Errorf("%s not received", packet)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestWriteAndInject(t *testing.T) {
|
|
chtun, tun := newChannelTUN(t.Logf, false)
|
|
defer tun.Close()
|
|
|
|
const size = 2 // all payloads have this size
|
|
written := []string{"w0", "w1"}
|
|
injected := []string{"i0", "i1"}
|
|
|
|
go func() {
|
|
for _, packet := range written {
|
|
payload := []byte(packet)
|
|
n, err := tun.Write(payload, 0)
|
|
if err != nil {
|
|
t.Errorf("%s: error: %v", packet, err)
|
|
}
|
|
if n != size {
|
|
t.Errorf("%s: got size %d; want %d", packet, n, size)
|
|
}
|
|
}
|
|
}()
|
|
|
|
for _, packet := range injected {
|
|
go func(packet string) {
|
|
payload := []byte(packet)
|
|
err := tun.InjectInboundCopy(payload)
|
|
if err != nil {
|
|
t.Errorf("%s: error: %v", packet, err)
|
|
}
|
|
}(packet)
|
|
}
|
|
|
|
seen := make(map[string]bool)
|
|
// We expect the same packets back, in no particular order.
|
|
for i := 0; i < len(written)+len(injected); i++ {
|
|
packet := <-chtun.Inbound
|
|
got := string(packet)
|
|
t.Logf("read %d: got %s", i, got)
|
|
seen[got] = true
|
|
}
|
|
|
|
for _, packet := range written {
|
|
if !seen[packet] {
|
|
t.Errorf("%s not received", packet)
|
|
}
|
|
}
|
|
for _, packet := range injected {
|
|
if !seen[packet] {
|
|
t.Errorf("%s not received", packet)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestFilter(t *testing.T) {
|
|
chtun, tun := newChannelTUN(t.Logf, true)
|
|
defer tun.Close()
|
|
|
|
type direction int
|
|
|
|
const (
|
|
in direction = iota
|
|
out
|
|
)
|
|
|
|
tests := []struct {
|
|
name string
|
|
dir direction
|
|
drop bool
|
|
data []byte
|
|
}{
|
|
{"junk_in", in, true, []byte("\x45not a valid IPv4 packet")},
|
|
{"junk_out", out, true, []byte("\x45not a valid IPv4 packet")},
|
|
{"bad_port_in", in, true, udp4("5.6.7.8", "1.2.3.4", 22, 22)},
|
|
{"bad_port_out", out, false, udp4("1.2.3.4", "5.6.7.8", 22, 22)},
|
|
{"bad_ip_in", in, true, udp4("8.1.1.1", "1.2.3.4", 89, 89)},
|
|
{"bad_ip_out", out, false, udp4("1.2.3.4", "8.1.1.1", 98, 98)},
|
|
{"good_packet_in", in, false, udp4("5.6.7.8", "1.2.3.4", 89, 89)},
|
|
{"good_packet_out", out, false, udp4("1.2.3.4", "5.6.7.8", 98, 98)},
|
|
}
|
|
|
|
// A reader on the other end of the tun.
|
|
go func() {
|
|
var recvbuf []byte
|
|
for {
|
|
select {
|
|
case <-tun.closed:
|
|
return
|
|
case recvbuf = <-chtun.Inbound:
|
|
// continue
|
|
}
|
|
for _, tt := range tests {
|
|
if tt.drop && bytes.Equal(recvbuf, tt.data) {
|
|
t.Errorf("did not drop %s", tt.name)
|
|
}
|
|
}
|
|
}
|
|
}()
|
|
|
|
var buf [MaxPacketSize]byte
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
var n int
|
|
var err error
|
|
var filtered bool
|
|
|
|
if tt.dir == in {
|
|
_, err = tun.Write(tt.data, 0)
|
|
if err == ErrFiltered {
|
|
filtered = true
|
|
err = nil
|
|
}
|
|
} else {
|
|
chtun.Outbound <- tt.data
|
|
n, err = tun.Read(buf[:], 0)
|
|
// In the read direction, errors are fatal, so we return n = 0 instead.
|
|
filtered = (n == 0)
|
|
}
|
|
|
|
if err != nil {
|
|
t.Errorf("got err %v; want nil", err)
|
|
}
|
|
|
|
if filtered {
|
|
if !tt.drop {
|
|
t.Errorf("got drop; want accept")
|
|
}
|
|
} else {
|
|
if tt.drop {
|
|
t.Errorf("got accept; want drop")
|
|
}
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestAllocs(t *testing.T) {
|
|
ftun, tun := newFakeTUN(t.Logf, false)
|
|
defer tun.Close()
|
|
|
|
buf := []byte{0x00}
|
|
allocs := testing.AllocsPerRun(100, func() {
|
|
_, err := ftun.Write(buf, 0)
|
|
if err != nil {
|
|
t.Errorf("write: error: %v", err)
|
|
return
|
|
}
|
|
})
|
|
|
|
if allocs > 0 {
|
|
t.Errorf("read allocs = %v; want 0", allocs)
|
|
}
|
|
}
|
|
|
|
func TestClose(t *testing.T) {
|
|
ftun, tun := newFakeTUN(t.Logf, false)
|
|
|
|
data := udp4("1.2.3.4", "5.6.7.8", 98, 98)
|
|
_, err := ftun.Write(data, 0)
|
|
if err != nil {
|
|
t.Error(err)
|
|
}
|
|
|
|
tun.Close()
|
|
_, err = ftun.Write(data, 0)
|
|
if err == nil {
|
|
t.Error("Expected error from ftun.Write() after Close()")
|
|
}
|
|
}
|
|
|
|
func BenchmarkWrite(b *testing.B) {
|
|
ftun, tun := newFakeTUN(b.Logf, true)
|
|
defer tun.Close()
|
|
|
|
packet := udp4("5.6.7.8", "1.2.3.4", 89, 89)
|
|
for i := 0; i < b.N; i++ {
|
|
_, err := ftun.Write(packet, 0)
|
|
if err != nil {
|
|
b.Errorf("err = %v; want nil", err)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestAtomic64Alignment(t *testing.T) {
|
|
off := unsafe.Offsetof(Wrapper{}.lastActivityAtomic)
|
|
if off%8 != 0 {
|
|
t.Errorf("offset %v not 8-byte aligned", off)
|
|
}
|
|
|
|
c := new(Wrapper)
|
|
atomic.StoreInt64(&c.lastActivityAtomic, 123)
|
|
}
|
|
|
|
func TestPeerAPIBypass(t *testing.T) {
|
|
wrapperWithPeerAPI := &Wrapper{
|
|
PeerAPIPort: func(ip netaddr.IP) (port uint16, ok bool) {
|
|
if ip == netaddr.MustParseIP("100.64.1.2") {
|
|
return 60000, true
|
|
}
|
|
return
|
|
},
|
|
}
|
|
|
|
tests := []struct {
|
|
name string
|
|
w *Wrapper
|
|
filter *filter.Filter
|
|
pkt []byte
|
|
want filter.Response
|
|
}{
|
|
{
|
|
name: "reject_nil_filter",
|
|
w: &Wrapper{
|
|
PeerAPIPort: func(netaddr.IP) (port uint16, ok bool) {
|
|
return 60000, true
|
|
},
|
|
},
|
|
pkt: tcp4syn("1.2.3.4", "100.64.1.2", 1234, 60000),
|
|
want: filter.Drop,
|
|
},
|
|
{
|
|
name: "reject_with_filter",
|
|
w: &Wrapper{},
|
|
filter: filter.NewAllowNone(logger.Discard, new(netaddr.IPSet)),
|
|
pkt: tcp4syn("1.2.3.4", "100.64.1.2", 1234, 60000),
|
|
want: filter.Drop,
|
|
},
|
|
{
|
|
name: "peerapi_bypass_filter",
|
|
w: wrapperWithPeerAPI,
|
|
filter: filter.NewAllowNone(logger.Discard, new(netaddr.IPSet)),
|
|
pkt: tcp4syn("1.2.3.4", "100.64.1.2", 1234, 60000),
|
|
want: filter.Accept,
|
|
},
|
|
{
|
|
name: "peerapi_dont_bypass_filter_wrong_port",
|
|
w: wrapperWithPeerAPI,
|
|
filter: filter.NewAllowNone(logger.Discard, new(netaddr.IPSet)),
|
|
pkt: tcp4syn("1.2.3.4", "100.64.1.2", 1234, 60001),
|
|
want: filter.Drop,
|
|
},
|
|
{
|
|
name: "peerapi_dont_bypass_filter_wrong_dst_ip",
|
|
w: wrapperWithPeerAPI,
|
|
filter: filter.NewAllowNone(logger.Discard, new(netaddr.IPSet)),
|
|
pkt: tcp4syn("1.2.3.4", "100.64.1.3", 1234, 60000),
|
|
want: filter.Drop,
|
|
},
|
|
}
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
tt.w.SetFilter(tt.filter)
|
|
tt.w.disableTSMPRejected = true
|
|
if got := tt.w.filterIn(tt.pkt); got != tt.want {
|
|
t.Errorf("got = %v; want %v", got, tt.want)
|
|
}
|
|
})
|
|
}
|
|
}
|