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package connection
import (
"bytes"
"context"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"encoding/pem"
"fmt"
"io"
"math/big"
"net"
"net/http"
"net/url"
"os"
"sync"
"testing"
"time"
"github.com/gobwas/ws/wsutil"
"github.com/google/uuid"
"github.com/lucas-clemente/quic-go"
"github.com/pkg/errors"
"github.com/rs/zerolog"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/cloudflare/cloudflared/datagramsession"
quicpogs "github.com/cloudflare/cloudflared/quic"
tunnelpogs "github.com/cloudflare/cloudflared/tunnelrpc/pogs"
)
var (
testTLSServerConfig = generateTLSConfig()
testQUICConfig = &quic.Config{
KeepAlive: true,
EnableDatagrams: true,
}
)
// TestQUICServer tests if a quic server accepts and responds to a quic client with the acceptance protocol.
// It also serves as a demonstration for communication with the QUIC connection started by a cloudflared.
func TestQUICServer(t *testing.T) {
// Start a UDP Listener for QUIC.
udpAddr, err := net.ResolveUDPAddr("udp", "127.0.0.1:0")
require.NoError(t, err)
udpListener, err := net.ListenUDP(udpAddr.Network(), udpAddr)
require.NoError(t, err)
defer udpListener.Close()
// This is simply a sample websocket frame message.
wsBuf := &bytes.Buffer{}
wsutil.WriteClientText(wsBuf, []byte("Hello"))
var tests = []struct {
desc string
dest string
connectionType quicpogs.ConnectionType
metadata []quicpogs.Metadata
message []byte
expectedResponse []byte
}{
{
desc: "test http proxy",
dest: "/ok",
connectionType: quicpogs.ConnectionTypeHTTP,
metadata: []quicpogs.Metadata{
{
Key: "HttpHeader:Cf-Ray",
Val: "123123123",
},
{
Key: "HttpHost",
Val: "cf.host",
},
{
Key: "HttpMethod",
Val: "GET",
},
},
expectedResponse: []byte("OK"),
},
{
desc: "test http body request streaming",
dest: "/echo_body",
connectionType: quicpogs.ConnectionTypeHTTP,
metadata: []quicpogs.Metadata{
{
Key: "HttpHeader:Cf-Ray",
Val: "123123123",
},
{
Key: "HttpHost",
Val: "cf.host",
},
{
Key: "HttpMethod",
Val: "POST",
},
{
Key: "HttpHeader:Content-Length",
Val: "24",
},
},
message: []byte("This is the message body"),
expectedResponse: []byte("This is the message body"),
},
{
desc: "test ws proxy",
dest: "/ok",
connectionType: quicpogs.ConnectionTypeWebsocket,
metadata: []quicpogs.Metadata{
{
Key: "HttpHeader:Cf-Cloudflared-Proxy-Connection-Upgrade",
Val: "Websocket",
},
{
Key: "HttpHeader:Another-Header",
Val: "Misc",
},
{
Key: "HttpHost",
Val: "cf.host",
},
{
Key: "HttpMethod",
Val: "get",
},
},
message: wsBuf.Bytes(),
expectedResponse: []byte{0x81, 0x5, 0x48, 0x65, 0x6c, 0x6c, 0x6f},
},
{
desc: "test tcp proxy",
connectionType: quicpogs.ConnectionTypeTCP,
metadata: []quicpogs.Metadata{},
message: []byte("Here is some tcp data"),
expectedResponse: []byte("Here is some tcp data"),
},
}
for _, test := range tests {
t.Run(test.desc, func(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
quicServer(
t, udpListener, testTLSServerConfig, testQUICConfig,
test.dest, test.connectionType, test.metadata, test.message, test.expectedResponse,
)
}()
qc := testQUICConnection(ctx, udpListener.LocalAddr(), t)
go qc.Serve(ctx)
wg.Wait()
cancel()
})
}
}
type fakeControlStream struct {
ControlStreamHandler
}
func (fakeControlStream) ServeControlStream(ctx context.Context, rw io.ReadWriteCloser, connOptions *tunnelpogs.ConnectionOptions, shouldWaitForUnregister bool) error {
return nil
}
func (fakeControlStream) IsStopped() bool {
return true
}
func quicServer(
t *testing.T,
conn net.PacketConn,
tlsConf *tls.Config,
config *quic.Config,
dest string,
connectionType quicpogs.ConnectionType,
metadata []quicpogs.Metadata,
message []byte,
expectedResponse []byte,
) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
earlyListener, err := quic.Listen(conn, tlsConf, config)
require.NoError(t, err)
session, err := earlyListener.Accept(ctx)
require.NoError(t, err)
stream, err := session.OpenStreamSync(context.Background())
require.NoError(t, err)
reqClientStream := quicpogs.RequestClientStream{ReadWriteCloser: stream}
err = reqClientStream.WriteConnectRequestData(dest, connectionType, metadata...)
require.NoError(t, err)
_, err = reqClientStream.ReadConnectResponseData()
require.NoError(t, err)
if message != nil {
// ALPN successful. Write data.
_, err := stream.Write([]byte(message))
require.NoError(t, err)
}
response := make([]byte, len(expectedResponse))
stream.Read(response)
require.NoError(t, err)
// For now it is an echo server. Verify if the same data is returned.
assert.Equal(t, expectedResponse, response)
}
// Setup a bare-bones TLS config for the server
func generateTLSConfig() *tls.Config {
key, err := rsa.GenerateKey(rand.Reader, 1024)
if err != nil {
panic(err)
}
template := x509.Certificate{SerialNumber: big.NewInt(1)}
certDER, err := x509.CreateCertificate(rand.Reader, &template, &template, &key.PublicKey, key)
if err != nil {
panic(err)
}
keyPEM := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)})
certPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certDER})
tlsCert, err := tls.X509KeyPair(certPEM, keyPEM)
if err != nil {
panic(err)
}
return &tls.Config{
Certificates: []tls.Certificate{tlsCert},
NextProtos: []string{"argotunnel"},
}
}
type mockOriginProxyWithRequest struct{}
func (moc *mockOriginProxyWithRequest) ProxyHTTP(w ResponseWriter, r *http.Request, isWebsocket bool) error {
// These are a series of crude tests to ensure the headers and http related data is transferred from
// metadata.
if r.Method == "" {
return errors.New("method not sent")
}
if r.Host == "" {
return errors.New("host not sent")
}
if len(r.Header) == 0 {
return errors.New("headers not set")
}
if isWebsocket {
return wsEndpoint(w, r)
}
switch r.URL.Path {
case "/ok":
originRespEndpoint(w, http.StatusOK, []byte(http.StatusText(http.StatusOK)))
case "/echo_body":
resp := &http.Response{
StatusCode: http.StatusOK,
}
_ = w.WriteRespHeaders(resp.StatusCode, resp.Header)
io.Copy(w, r.Body)
case "/error":
return fmt.Errorf("Failed to proxy to origin")
default:
originRespEndpoint(w, http.StatusNotFound, []byte("page not found"))
}
return nil
}
func TestBuildHTTPRequest(t *testing.T) {
var tests = []struct {
name string
connectRequest *quicpogs.ConnectRequest
body io.ReadCloser
req *http.Request
}{
{
name: "check if http.Request is built correctly with content length",
connectRequest: &quicpogs.ConnectRequest{
Dest: "http://test.com",
Metadata: []quicpogs.Metadata{
{
Key: "HttpHeader:Cf-Cloudflared-Proxy-Connection-Upgrade",
Val: "Websocket",
},
{
Key: "HttpHeader:Content-Length",
Val: "514",
},
{
Key: "HttpHeader:Another-Header",
Val: "Misc",
},
{
Key: "HttpHost",
Val: "cf.host",
},
{
Key: "HttpMethod",
Val: "get",
},
},
},
req: &http.Request{
Method: "get",
URL: &url.URL{
Scheme: "http",
Host: "test.com",
},
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: http.Header{
"Another-Header": []string{"Misc"},
"Content-Length": []string{"514"},
},
ContentLength: 514,
Host: "cf.host",
Body: io.NopCloser(&bytes.Buffer{}),
},
body: io.NopCloser(&bytes.Buffer{}),
},
{
name: "if content length isn't part of request headers, then it's not set",
connectRequest: &quicpogs.ConnectRequest{
Dest: "http://test.com",
Metadata: []quicpogs.Metadata{
{
Key: "HttpHeader:Cf-Cloudflared-Proxy-Connection-Upgrade",
Val: "Websocket",
},
{
Key: "HttpHeader:Another-Header",
Val: "Misc",
},
{
Key: "HttpHost",
Val: "cf.host",
},
{
Key: "HttpMethod",
Val: "get",
},
},
},
req: &http.Request{
Method: "get",
URL: &url.URL{
Scheme: "http",
Host: "test.com",
},
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: http.Header{
"Another-Header": []string{"Misc"},
},
ContentLength: 0,
Host: "cf.host",
Body: nil,
},
body: io.NopCloser(&bytes.Buffer{}),
},
{
name: "if content length is 0, but transfer-encoding is chunked, body is not nil",
connectRequest: &quicpogs.ConnectRequest{
Dest: "http://test.com",
Metadata: []quicpogs.Metadata{
{
Key: "HttpHeader:Another-Header",
Val: "Misc",
},
{
Key: "HttpHeader:Transfer-Encoding",
Val: "chunked",
},
{
Key: "HttpHost",
Val: "cf.host",
},
{
Key: "HttpMethod",
Val: "get",
},
},
},
req: &http.Request{
Method: "get",
URL: &url.URL{
Scheme: "http",
Host: "test.com",
},
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: http.Header{
"Another-Header": []string{"Misc"},
"Transfer-Encoding": []string{"chunked"},
},
ContentLength: 0,
Host: "cf.host",
Body: io.NopCloser(&bytes.Buffer{}),
},
body: io.NopCloser(&bytes.Buffer{}),
},
{
name: "if content length is 0, but transfer-encoding is gzip,chunked, body is not nil",
connectRequest: &quicpogs.ConnectRequest{
Dest: "http://test.com",
Metadata: []quicpogs.Metadata{
{
Key: "HttpHeader:Another-Header",
Val: "Misc",
},
{
Key: "HttpHeader:Transfer-Encoding",
Val: "gzip,chunked",
},
{
Key: "HttpHost",
Val: "cf.host",
},
{
Key: "HttpMethod",
Val: "get",
},
},
},
req: &http.Request{
Method: "get",
URL: &url.URL{
Scheme: "http",
Host: "test.com",
},
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: http.Header{
"Another-Header": []string{"Misc"},
"Transfer-Encoding": []string{"gzip,chunked"},
},
ContentLength: 0,
Host: "cf.host",
Body: io.NopCloser(&bytes.Buffer{}),
},
body: io.NopCloser(&bytes.Buffer{}),
},
{
name: "if content length is 0, and connect request is a websocket, body is not nil",
connectRequest: &quicpogs.ConnectRequest{
Type: quicpogs.ConnectionTypeWebsocket,
Dest: "http://test.com",
Metadata: []quicpogs.Metadata{
{
Key: "HttpHeader:Another-Header",
Val: "Misc",
},
{
Key: "HttpHost",
Val: "cf.host",
},
{
Key: "HttpMethod",
Val: "get",
},
},
},
req: &http.Request{
Method: "get",
URL: &url.URL{
Scheme: "http",
Host: "test.com",
},
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: http.Header{
"Another-Header": []string{"Misc"},
},
ContentLength: 0,
Host: "cf.host",
Body: io.NopCloser(&bytes.Buffer{}),
},
body: io.NopCloser(&bytes.Buffer{}),
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
req, err := buildHTTPRequest(test.connectRequest, test.body)
assert.NoError(t, err)
test.req = test.req.WithContext(req.Context())
assert.Equal(t, test.req, req)
})
}
}
func (moc *mockOriginProxyWithRequest) ProxyTCP(ctx context.Context, rwa ReadWriteAcker, tcpRequest *TCPRequest) error {
rwa.AckConnection()
io.Copy(rwa, rwa)
return nil
}
func TestServeUDPSession(t *testing.T) {
// Start a UDP Listener for QUIC.
udpAddr, err := net.ResolveUDPAddr("udp", "127.0.0.1:0")
require.NoError(t, err)
udpListener, err := net.ListenUDP(udpAddr.Network(), udpAddr)
require.NoError(t, err)
defer udpListener.Close()
ctx, cancel := context.WithCancel(context.Background())
// Establish QUIC connection with edge
edgeQUICSessionChan := make(chan quic.Session)
go func() {
earlyListener, err := quic.Listen(udpListener, testTLSServerConfig, testQUICConfig)
require.NoError(t, err)
edgeQUICSession, err := earlyListener.Accept(ctx)
require.NoError(t, err)
edgeQUICSessionChan <- edgeQUICSession
}()
qc := testQUICConnection(ctx, udpListener.LocalAddr(), t)
go qc.Serve(ctx)
edgeQUICSession := <-edgeQUICSessionChan
serveSession(ctx, qc, edgeQUICSession, closedByOrigin, io.EOF.Error(), t)
serveSession(ctx, qc, edgeQUICSession, closedByTimeout, datagramsession.SessionIdleErr(time.Millisecond*50).Error(), t)
serveSession(ctx, qc, edgeQUICSession, closedByRemote, "eyeball closed connection", t)
cancel()
}
func serveSession(ctx context.Context, qc *QUICConnection, edgeQUICSession quic.Session, closeType closeReason, expectedReason string, t *testing.T) {
var (
payload = []byte(t.Name())
)
sessionID := uuid.New()
cfdConn, originConn := net.Pipe()
// Registers and run a new session
session, err := qc.sessionManager.RegisterSession(ctx, sessionID, cfdConn)
require.NoError(t, err)
sessionDone := make(chan struct{})
go func() {
qc.serveUDPSession(session, time.Millisecond*50)
close(sessionDone)
}()
// Send a message to the quic session on edge side, it should be deumx to this datagram session
muxedPayload, err := quicpogs.SuffixSessionID(sessionID, payload)
require.NoError(t, err)
err = edgeQUICSession.SendMessage(muxedPayload)
require.NoError(t, err)
readBuffer := make([]byte, len(payload)+1)
n, err := originConn.Read(readBuffer)
require.NoError(t, err)
require.Equal(t, len(payload), n)
require.True(t, bytes.Equal(payload, readBuffer[:n]))
// Close connection to terminate session
switch closeType {
case closedByOrigin:
originConn.Close()
case closedByRemote:
err = qc.UnregisterUdpSession(ctx, sessionID, expectedReason)
require.NoError(t, err)
case closedByTimeout:
}
if closeType != closedByRemote {
// Session was not closed by remote, so closeUDPSession should be invoked to unregister from remote
unregisterFromEdgeChan := make(chan struct{})
rpcServer := &mockSessionRPCServer{
sessionID: sessionID,
unregisterReason: expectedReason,
calledUnregisterChan: unregisterFromEdgeChan,
}
go runMockSessionRPCServer(ctx, edgeQUICSession, rpcServer, t)
<-unregisterFromEdgeChan
}
<-sessionDone
}
type closeReason uint8
const (
closedByOrigin closeReason = iota
closedByRemote
closedByTimeout
)
func runMockSessionRPCServer(ctx context.Context, session quic.Session, rpcServer *mockSessionRPCServer, t *testing.T) {
stream, err := session.AcceptStream(ctx)
require.NoError(t, err)
if stream.StreamID() == 0 {
// Skip the first stream, it's the control stream of the QUIC connection
stream, err = session.AcceptStream(ctx)
require.NoError(t, err)
}
protocol, err := quicpogs.DetermineProtocol(stream)
assert.NoError(t, err)
rpcServerStream, err := quicpogs.NewRPCServerStream(stream, protocol)
assert.NoError(t, err)
log := zerolog.New(os.Stdout)
err = rpcServerStream.Serve(rpcServer, &log)
assert.NoError(t, err)
}
type mockSessionRPCServer struct {
sessionID uuid.UUID
unregisterReason string
calledUnregisterChan chan struct{}
}
func (s mockSessionRPCServer) RegisterUdpSession(ctx context.Context, sessionID uuid.UUID, dstIP net.IP, dstPort uint16, closeIdleAfter time.Duration) error {
return fmt.Errorf("mockSessionRPCServer doesn't implement RegisterUdpSession")
}
func (s mockSessionRPCServer) UnregisterUdpSession(ctx context.Context, sessionID uuid.UUID, reason string) error {
if s.sessionID != sessionID {
return fmt.Errorf("expect session ID %s, got %s", s.sessionID, sessionID)
}
if s.unregisterReason != reason {
return fmt.Errorf("expect unregister reason %s, got %s", s.unregisterReason, reason)
}
close(s.calledUnregisterChan)
fmt.Println("unregister from edge")
return nil
}
func testQUICConnection(ctx context.Context, udpListenerAddr net.Addr, t *testing.T) *QUICConnection {
tlsClientConfig := &tls.Config{
InsecureSkipVerify: true,
NextProtos: []string{"argotunnel"},
}
// Start a mock httpProxy
originProxy := &mockOriginProxyWithRequest{}
log := zerolog.New(os.Stdout)
qc, err := NewQUICConnection(
ctx,
testQUICConfig,
udpListenerAddr,
tlsClientConfig,
originProxy,
&tunnelpogs.ConnectionOptions{},
fakeControlStream{},
NewObserver(&log, &log, false),
)
require.NoError(t, err)
return qc
}