cloudflared-mirror/ingress/origin_service.go

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package ingress
import (
"context"
"crypto/tls"
"fmt"
"io"
"net"
"net/http"
"net/url"
"sync"
"time"
"github.com/cloudflare/cloudflared/hello"
"github.com/cloudflare/cloudflared/socks"
"github.com/cloudflare/cloudflared/tlsconfig"
"github.com/cloudflare/cloudflared/websocket"
gws "github.com/gorilla/websocket"
"github.com/pkg/errors"
"github.com/rs/zerolog"
)
// originService is something a tunnel can proxy traffic to.
type originService interface {
String() string
// Start the origin service if it's managed by cloudflared, e.g. proxy servers or Hello World.
// If it's not managed by cloudflared, this is a no-op because the user is responsible for
// starting the origin service.
start(wg *sync.WaitGroup, log *zerolog.Logger, shutdownC <-chan struct{}, errC chan error, cfg OriginRequestConfig) error
}
// unixSocketPath is an OriginService representing a unix socket (which accepts HTTP)
type unixSocketPath struct {
path string
transport *http.Transport
}
func (o *unixSocketPath) String() string {
return "unix socket: " + o.path
}
func (o *unixSocketPath) start(wg *sync.WaitGroup, log *zerolog.Logger, shutdownC <-chan struct{}, errC chan error, cfg OriginRequestConfig) error {
transport, err := newHTTPTransport(o, cfg, log)
if err != nil {
return err
}
o.transport = transport
return nil
}
func (o *unixSocketPath) Dial(reqURL *url.URL, headers http.Header) (*gws.Conn, *http.Response, error) {
d := &gws.Dialer{
NetDial: o.transport.Dial,
NetDialContext: o.transport.DialContext,
TLSClientConfig: o.transport.TLSClientConfig,
}
reqURL.Scheme = websocket.ChangeRequestScheme(reqURL)
return d.Dial(reqURL.String(), headers)
}
type httpService struct {
url *url.URL
transport *http.Transport
}
func (o *httpService) start(wg *sync.WaitGroup, log *zerolog.Logger, shutdownC <-chan struct{}, errC chan error, cfg OriginRequestConfig) error {
transport, err := newHTTPTransport(o, cfg, log)
if err != nil {
return err
}
o.transport = transport
return nil
}
func (o *httpService) String() string {
return o.url.String()
}
// bridgeService is like a jump host, the destination is specified by the client
type bridgeService struct {
client *tcpClient
}
// if streamHandler is nil, a default one is set.
func newBridgeService(streamHandler streamHandlerFunc) *bridgeService {
return &bridgeService{
client: &tcpClient{
streamHandler: streamHandler,
},
}
}
func (o *bridgeService) String() string {
return "bridge service"
}
func (o *bridgeService) start(wg *sync.WaitGroup, log *zerolog.Logger, shutdownC <-chan struct{}, errC chan error, cfg OriginRequestConfig) error {
// streamHandler is already set by the constructor.
if o.client.streamHandler != nil {
return nil
}
if cfg.ProxyType == socksProxy {
o.client.streamHandler = socks.StreamHandler
} else {
o.client.streamHandler = DefaultStreamHandler
}
return nil
}
type singleTCPService struct {
dest string
client *tcpClient
}
func newSingleTCPService(url *url.URL) *singleTCPService {
switch url.Scheme {
case "ssh":
addPortIfMissing(url, 22)
case "rdp":
addPortIfMissing(url, 3389)
case "smb":
addPortIfMissing(url, 445)
case "tcp":
addPortIfMissing(url, 7864) // just a random port since there isn't a default in this case
}
return &singleTCPService{
dest: url.Host,
client: &tcpClient{},
}
}
func addPortIfMissing(uri *url.URL, port int) {
if uri.Port() == "" {
uri.Host = fmt.Sprintf("%s:%d", uri.Hostname(), port)
}
}
func (o *singleTCPService) String() string {
return o.dest
}
func (o *singleTCPService) start(wg *sync.WaitGroup, log *zerolog.Logger, shutdownC <-chan struct{}, errC chan error, cfg OriginRequestConfig) error {
if cfg.ProxyType == socksProxy {
o.client.streamHandler = socks.StreamHandler
} else {
o.client.streamHandler = DefaultStreamHandler
}
return nil
}
// HelloWorld is an OriginService for the built-in Hello World server.
// Users only use this for testing and experimenting with cloudflared.
type helloWorld struct {
server net.Listener
transport *http.Transport
}
func (o *helloWorld) String() string {
return "Hello World test origin"
}
// Start starts a HelloWorld server and stores its address in the Service receiver.
func (o *helloWorld) start(
wg *sync.WaitGroup,
log *zerolog.Logger,
shutdownC <-chan struct{},
errC chan error,
cfg OriginRequestConfig,
) error {
transport, err := newHTTPTransport(o, cfg, log)
if err != nil {
return err
}
o.transport = transport
helloListener, err := hello.CreateTLSListener("127.0.0.1:")
if err != nil {
return errors.Wrap(err, "Cannot start Hello World Server")
}
wg.Add(1)
go func() {
defer wg.Done()
_ = hello.StartHelloWorldServer(log, helloListener, shutdownC)
}()
o.server = helloListener
return nil
}
// statusCode is an OriginService that just responds with a given HTTP status.
// Typical use-case is "user wants the catch-all rule to just respond 404".
type statusCode struct {
resp *http.Response
}
func newStatusCode(status int) statusCode {
resp := &http.Response{
StatusCode: status,
Status: fmt.Sprintf("%d %s", status, http.StatusText(status)),
Body: new(NopReadCloser),
}
return statusCode{resp: resp}
}
func (o *statusCode) String() string {
return fmt.Sprintf("HTTP %d", o.resp.StatusCode)
}
func (o *statusCode) start(
wg *sync.WaitGroup,
log *zerolog.Logger,
shutdownC <-chan struct{},
errC chan error,
cfg OriginRequestConfig,
) error {
return nil
}
type NopReadCloser struct{}
// Read always returns EOF to signal end of input
func (nrc *NopReadCloser) Read(buf []byte) (int, error) {
return 0, io.EOF
}
func (nrc *NopReadCloser) Close() error {
return nil
}
func newHTTPTransport(service originService, cfg OriginRequestConfig, log *zerolog.Logger) (*http.Transport, error) {
originCertPool, err := tlsconfig.LoadOriginCA(cfg.CAPool, log)
if err != nil {
return nil, errors.Wrap(err, "Error loading cert pool")
}
httpTransport := http.Transport{
Proxy: http.ProxyFromEnvironment,
MaxIdleConns: cfg.KeepAliveConnections,
MaxIdleConnsPerHost: cfg.KeepAliveConnections,
IdleConnTimeout: cfg.KeepAliveTimeout,
TLSHandshakeTimeout: cfg.TLSTimeout,
ExpectContinueTimeout: 1 * time.Second,
TLSClientConfig: &tls.Config{RootCAs: originCertPool, InsecureSkipVerify: cfg.NoTLSVerify},
}
if _, isHelloWorld := service.(*helloWorld); !isHelloWorld && cfg.OriginServerName != "" {
httpTransport.TLSClientConfig.ServerName = cfg.OriginServerName
}
dialer := &net.Dialer{
Timeout: cfg.ConnectTimeout,
KeepAlive: cfg.TCPKeepAlive,
}
if cfg.NoHappyEyeballs {
dialer.FallbackDelay = -1 // As of Golang 1.12, a negative delay disables "happy eyeballs"
}
// DialContext depends on which kind of origin is being used.
dialContext := dialer.DialContext
switch service := service.(type) {
// If this origin is a unix socket, enforce network type "unix".
case *unixSocketPath:
httpTransport.DialContext = func(ctx context.Context, _, _ string) (net.Conn, error) {
return dialContext(ctx, "unix", service.path)
}
// Otherwise, use the regular network config.
default:
httpTransport.DialContext = dialContext
}
return &httpTransport, nil
}
// MockOriginHTTPService should only be used by other packages to mock OriginService. Set Transport to configure desired RoundTripper behavior.
type MockOriginHTTPService struct {
Transport http.RoundTripper
}
func (mos MockOriginHTTPService) RoundTrip(req *http.Request) (*http.Response, error) {
return mos.Transport.RoundTrip(req)
}
func (mos MockOriginHTTPService) String() string {
return "MockOriginService"
}
func (mos MockOriginHTTPService) start(wg *sync.WaitGroup, log *zerolog.Logger, shutdownC <-chan struct{}, errC chan error, cfg OriginRequestConfig) error {
return nil
}