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handshaker_test.go
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// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT
package dtls
import (
"bytes"
"context"
"crypto/tls"
"errors"
"sync"
"testing"
"time"
"github.com/pion/dtls/v3/pkg/crypto/selfsign"
"github.com/pion/dtls/v3/pkg/crypto/signaturehash"
"github.com/pion/dtls/v3/pkg/protocol/alert"
"github.com/pion/dtls/v3/pkg/protocol/handshake"
"github.com/pion/dtls/v3/pkg/protocol/recordlayer"
"github.com/pion/logging"
"github.com/pion/transport/v3/test"
)
const nonZeroRetransmitInterval = 100 * time.Millisecond
// Test that writes to the key log are in the correct format and only applies
// when a key log writer is given.
func TestWriteKeyLog(t *testing.T) {
var buf bytes.Buffer
cfg := handshakeConfig{
keyLogWriter: &buf,
}
cfg.writeKeyLog("LABEL", []byte{0xAA, 0xBB, 0xCC}, []byte{0xDD, 0xEE, 0xFF})
// Secrets follow the format <Label> <space> <ClientRandom> <space> <Secret>
// https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/Key_Log_Format
want := "LABEL aabbcc ddeeff\n"
if buf.String() != want {
t.Fatalf("Got %s want %s", buf.String(), want)
}
// no key log writer = no writes
cfg = handshakeConfig{}
cfg.writeKeyLog("LABEL", []byte{0xAA, 0xBB, 0xCC}, []byte{0xDD, 0xEE, 0xFF})
}
func TestHandshaker(t *testing.T) {
// Check for leaking routines
report := test.CheckRoutines(t)
defer report()
loggerFactory := logging.NewDefaultLoggerFactory()
logger := loggerFactory.NewLogger("dtls")
cipherSuites, err := parseCipherSuites(nil, nil, true, false)
if err != nil {
t.Fatal(err)
}
clientCert, err := selfsign.GenerateSelfSigned()
if err != nil {
t.Fatal(err)
}
genFilters := map[string]func() (TestEndpoint, TestEndpoint, func(t *testing.T)){
"PassThrough": func() (TestEndpoint, TestEndpoint, func(t *testing.T)) {
return TestEndpoint{}, TestEndpoint{}, nil
},
"HelloVerifyRequestLost": func() (TestEndpoint, TestEndpoint, func(t *testing.T)) {
var (
cntHelloVerifyRequest = 0
cntClientHelloNoCookie = 0
)
const helloVerifyDrop = 5
clientEndpoint := TestEndpoint{
Filter: func(p *packet) bool {
h, ok := p.record.Content.(*handshake.Handshake)
if !ok {
return true
}
if hmch, ok := h.Message.(*handshake.MessageClientHello); ok {
if len(hmch.Cookie) == 0 {
cntClientHelloNoCookie++
}
}
return true
},
}
serverEndpoint := TestEndpoint{
Filter: func(p *packet) bool {
h, ok := p.record.Content.(*handshake.Handshake)
if !ok {
return true
}
if _, ok := h.Message.(*handshake.MessageHelloVerifyRequest); ok {
cntHelloVerifyRequest++
return cntHelloVerifyRequest > helloVerifyDrop
}
return true
},
}
report := func(t *testing.T) {
if cntHelloVerifyRequest != helloVerifyDrop+1 {
t.Errorf("Number of HelloVerifyRequest retransmit is wrong, expected: %d times, got: %d times", helloVerifyDrop+1, cntHelloVerifyRequest)
}
if cntClientHelloNoCookie != cntHelloVerifyRequest {
t.Errorf(
"HelloVerifyRequest must be triggered only by ClientHello, but HelloVerifyRequest was sent %d times and ClientHello was sent %d times",
cntHelloVerifyRequest, cntClientHelloNoCookie,
)
}
}
return clientEndpoint, serverEndpoint, report
},
"NoLatencyTest": func() (TestEndpoint, TestEndpoint, func(t *testing.T)) {
var (
cntClientFinished = 0
cntServerFinished = 0
)
clientEndpoint := TestEndpoint{
Filter: func(p *packet) bool {
h, ok := p.record.Content.(*handshake.Handshake)
if !ok {
return true
}
if _, ok := h.Message.(*handshake.MessageFinished); ok {
cntClientFinished++
}
return true
},
}
serverEndpoint := TestEndpoint{
Filter: func(p *packet) bool {
h, ok := p.record.Content.(*handshake.Handshake)
if !ok {
return true
}
if _, ok := h.Message.(*handshake.MessageFinished); ok {
cntServerFinished++
}
return true
},
}
report := func(t *testing.T) {
if cntClientFinished != 1 {
t.Errorf("Number of client finished is wrong, expected: %d times, got: %d times", 1, cntClientFinished)
}
if cntServerFinished != 1 {
t.Errorf("Number of server finished is wrong, expected: %d times, got: %d times", 1, cntServerFinished)
}
}
return clientEndpoint, serverEndpoint, report
},
"SlowServerTest": func() (TestEndpoint, TestEndpoint, func(t *testing.T)) {
var (
cntClientFinished = 0
isClientFinished = false
cntClientFinishedLastRetransmit = 0
cntServerFinished = 0
isServerFinished = false
cntServerFinishedLastRetransmit = 0
)
clientEndpoint := TestEndpoint{
Filter: func(p *packet) bool {
h, ok := p.record.Content.(*handshake.Handshake)
if !ok {
return true
}
if _, ok := h.Message.(*handshake.MessageFinished); ok {
if isClientFinished {
cntClientFinishedLastRetransmit++
} else {
cntClientFinished++
}
}
return true
},
Delay: 0,
OnFinished: func() {
isClientFinished = true
},
FinishWait: 2000 * time.Millisecond,
}
serverEndpoint := TestEndpoint{
Filter: func(p *packet) bool {
h, ok := p.record.Content.(*handshake.Handshake)
if !ok {
return true
}
if _, ok := h.Message.(*handshake.MessageFinished); ok {
if isServerFinished {
cntServerFinishedLastRetransmit++
} else {
cntServerFinished++
}
}
return true
},
Delay: 1000 * time.Millisecond,
OnFinished: func() {
isServerFinished = true
},
FinishWait: 2000 * time.Millisecond,
}
report := func(t *testing.T) {
// with one second server delay and 100 ms retransmit (+ exponential backoff), there should be close to 4 `Finished` from client
// using a range of 3 - 5 for checking
if cntClientFinished < 3 || cntClientFinished > 5 {
t.Errorf("Number of client finished is wrong, expected: %d - %d times, got: %d times", 3, 5, cntClientFinished)
}
if !isClientFinished {
t.Errorf("Client is not finished")
}
// there should be no `Finished` last retransmit from client
if cntClientFinishedLastRetransmit != 0 {
t.Errorf("Number of client finished last retransmit is wrong, expected: %d times, got: %d times", 0, cntClientFinishedLastRetransmit)
}
if cntServerFinished < 1 {
t.Errorf("Number of server finished is wrong, expected: at least %d times, got: %d times", 1, cntServerFinished)
}
if !isServerFinished {
t.Errorf("Server is not finished")
}
// there should be `Finished` last retransmit from server. Because of slow server, client would have sent several `Finished`.
if cntServerFinishedLastRetransmit < 1 {
t.Errorf("Number of server finished last retransmit is wrong, expected: at least %d times, got: %d times", 1, cntServerFinishedLastRetransmit)
}
}
return clientEndpoint, serverEndpoint, report
},
}
for name, filters := range genFilters {
clientEndpoint, serverEndpoint, report := filters()
t.Run(name, func(t *testing.T) {
ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
defer cancel()
if report != nil {
defer report(t)
}
ca, cb := flightTestPipe(ctx, clientEndpoint, serverEndpoint)
ca.state.isClient = true
var wg sync.WaitGroup
wg.Add(2)
ctxCliFinished, cancelCli := context.WithCancel(ctx)
ctxSrvFinished, cancelSrv := context.WithCancel(ctx)
go func() {
defer wg.Done()
cfg := &handshakeConfig{
localCipherSuites: cipherSuites,
localCertificates: []tls.Certificate{clientCert},
ellipticCurves: defaultCurves,
localSignatureSchemes: signaturehash.Algorithms(),
insecureSkipVerify: true,
log: logger,
onFlightState: func(_ flightVal, s handshakeState) {
if s == handshakeFinished {
if clientEndpoint.OnFinished != nil {
clientEndpoint.OnFinished()
}
time.AfterFunc(clientEndpoint.FinishWait, func() {
cancelCli()
})
}
},
initialRetransmitInterval: nonZeroRetransmitInterval,
}
fsm := newHandshakeFSM(&ca.state, ca.handshakeCache, cfg, flight1)
err := fsm.Run(ctx, ca, handshakePreparing)
switch {
case errors.Is(err, context.Canceled):
case errors.Is(err, context.DeadlineExceeded):
t.Error("Timeout")
default:
t.Error(err)
}
}()
go func() {
defer wg.Done()
cfg := &handshakeConfig{
localCipherSuites: cipherSuites,
localCertificates: []tls.Certificate{clientCert},
ellipticCurves: defaultCurves,
localSignatureSchemes: signaturehash.Algorithms(),
insecureSkipVerify: true,
log: logger,
onFlightState: func(_ flightVal, s handshakeState) {
if s == handshakeFinished {
if serverEndpoint.OnFinished != nil {
serverEndpoint.OnFinished()
}
time.AfterFunc(serverEndpoint.FinishWait, func() {
cancelSrv()
})
}
},
initialRetransmitInterval: nonZeroRetransmitInterval,
}
fsm := newHandshakeFSM(&cb.state, cb.handshakeCache, cfg, flight0)
err := fsm.Run(ctx, cb, handshakePreparing)
switch {
case errors.Is(err, context.Canceled):
case errors.Is(err, context.DeadlineExceeded):
t.Error("Timeout")
default:
t.Error(err)
}
}()
<-ctxCliFinished.Done()
<-ctxSrvFinished.Done()
cancel()
wg.Wait()
})
}
}
type packetFilter func(p *packet) bool
type TestEndpoint struct {
Filter packetFilter
Delay time.Duration
OnFinished func()
FinishWait time.Duration
}
func flightTestPipe(ctx context.Context, clientEndpoint TestEndpoint, serverEndpoint TestEndpoint) (*flightTestConn, *flightTestConn) {
ca := newHandshakeCache()
cb := newHandshakeCache()
chA := make(chan recvHandshakeState)
chB := make(chan recvHandshakeState)
return &flightTestConn{
handshakeCache: ca,
otherEndCache: cb,
recv: chA,
otherEndRecv: chB,
done: ctx.Done(),
filter: clientEndpoint.Filter,
delay: clientEndpoint.Delay,
}, &flightTestConn{
handshakeCache: cb,
otherEndCache: ca,
recv: chB,
otherEndRecv: chA,
done: ctx.Done(),
filter: serverEndpoint.Filter,
delay: serverEndpoint.Delay,
}
}
type flightTestConn struct {
state State
handshakeCache *handshakeCache
recv chan recvHandshakeState
done <-chan struct{}
epoch uint16
filter packetFilter
delay time.Duration
otherEndCache *handshakeCache
otherEndRecv chan recvHandshakeState
}
func (c *flightTestConn) recvHandshake() <-chan recvHandshakeState {
return c.recv
}
func (c *flightTestConn) setLocalEpoch(epoch uint16) {
c.epoch = epoch
}
func (c *flightTestConn) notify(context.Context, alert.Level, alert.Description) error {
return nil
}
func (c *flightTestConn) writePackets(_ context.Context, pkts []*packet) error {
time.Sleep(c.delay)
for _, p := range pkts {
if c.filter != nil && !c.filter(p) {
continue
}
if h, ok := p.record.Content.(*handshake.Handshake); ok {
handshakeRaw, err := p.record.Marshal()
if err != nil {
return err
}
c.handshakeCache.push(handshakeRaw[recordlayer.FixedHeaderSize:], p.record.Header.Epoch, h.Header.MessageSequence, h.Header.Type, c.state.isClient)
content, err := h.Message.Marshal()
if err != nil {
return err
}
h.Header.Length = uint32(len(content))
h.Header.FragmentLength = uint32(len(content))
hdr, err := h.Header.Marshal()
if err != nil {
return err
}
c.otherEndCache.push(
append(hdr, content...), p.record.Header.Epoch, h.Header.MessageSequence, h.Header.Type, c.state.isClient)
}
}
go func() {
select {
case c.otherEndRecv <- recvHandshakeState{done: make(chan struct{})}:
case <-c.done:
}
}()
// Avoid deadlock on JS/WASM environment due to context switch problem.
time.Sleep(10 * time.Millisecond)
return nil
}
func (c *flightTestConn) handleQueuedPackets(context.Context) error {
return nil
}
func (c *flightTestConn) sessionKey() []byte {
return nil
}