package tunnel import ( "context" "crypto/tls" "fmt" "io/ioutil" "net" "net/http" "os" "path/filepath" "strings" "time" "github.com/cloudflare/cloudflared/cmd/cloudflared/buildinfo" "github.com/cloudflare/cloudflared/cmd/cloudflared/config" "github.com/cloudflare/cloudflared/edgediscovery" "github.com/cloudflare/cloudflared/logger" "github.com/cloudflare/cloudflared/origin" "github.com/cloudflare/cloudflared/tlsconfig" tunnelpogs "github.com/cloudflare/cloudflared/tunnelrpc/pogs" "github.com/cloudflare/cloudflared/validation" "github.com/google/uuid" "github.com/mitchellh/go-homedir" "github.com/pkg/errors" "golang.org/x/crypto/ssh/terminal" "gopkg.in/urfave/cli.v2" ) var ( developerPortal = "https://developers.cloudflare.com/argo-tunnel" quickStartUrl = developerPortal + "/quickstart/quickstart/" serviceUrl = developerPortal + "/reference/service/" argumentsUrl = developerPortal + "/reference/arguments/" ) // returns the first path that contains a cert.pem file. If none of the DefaultConfigDirs // contains a cert.pem file, return empty string func findDefaultOriginCertPath() string { for _, defaultConfigDir := range config.DefaultConfigDirs { originCertPath, _ := homedir.Expand(filepath.Join(defaultConfigDir, config.DefaultCredentialFile)) if ok, _ := config.FileExists(originCertPath); ok { return originCertPath } } return "" } func generateRandomClientID(logger logger.Service) (string, error) { u, err := uuid.NewRandom() if err != nil { logger.Errorf("couldn't create UUID for client ID %s", err) return "", err } return u.String(), nil } func logClientOptions(c *cli.Context, logger logger.Service) { flags := make(map[string]interface{}) for _, flag := range c.LocalFlagNames() { flags[flag] = c.Generic(flag) } sliceFlags := []string{"header", "tag", "proxy-dns-upstream", "upstream", "edge"} for _, sliceFlag := range sliceFlags { if len(c.StringSlice(sliceFlag)) > 0 { flags[sliceFlag] = strings.Join(c.StringSlice(sliceFlag), ", ") } } if len(flags) > 0 { logger.Infof("Environment variables %v", flags) } envs := make(map[string]string) // Find env variables for Argo Tunnel for _, env := range os.Environ() { // All Argo Tunnel env variables start with TUNNEL_ if strings.Contains(env, "TUNNEL_") { vars := strings.Split(env, "=") if len(vars) == 2 { envs[vars[0]] = vars[1] } } } if len(envs) > 0 { logger.Infof("Environmental variables %v", envs) } } func dnsProxyStandAlone(c *cli.Context) bool { return c.IsSet("proxy-dns") && (!c.IsSet("hostname") && !c.IsSet("tag") && !c.IsSet("hello-world")) } func findOriginCert(c *cli.Context, logger logger.Service) (string, error) { originCertPath := c.String("origincert") if originCertPath == "" { logger.Infof("Cannot determine default origin certificate path. No file %s in %v", config.DefaultCredentialFile, config.DefaultConfigDirs) if isRunningFromTerminal() { logger.Errorf("You need to specify the origin certificate path with --origincert option, or set TUNNEL_ORIGIN_CERT environment variable. See %s for more information.", argumentsUrl) return "", fmt.Errorf("Client didn't specify origincert path when running from terminal") } else { logger.Errorf("You need to specify the origin certificate path by specifying the origincert option in the configuration file, or set TUNNEL_ORIGIN_CERT environment variable. See %s for more information.", serviceUrl) return "", fmt.Errorf("Client didn't specify origincert path") } } var err error originCertPath, err = homedir.Expand(originCertPath) if err != nil { logger.Errorf("Cannot resolve path %s: %s", originCertPath, err) return "", fmt.Errorf("Cannot resolve path %s", originCertPath) } // Check that the user has acquired a certificate using the login command ok, err := config.FileExists(originCertPath) if err != nil { logger.Errorf("Cannot check if origin cert exists at path %s", originCertPath) return "", fmt.Errorf("Cannot check if origin cert exists at path %s", originCertPath) } if !ok { logger.Errorf(`Cannot find a valid certificate for your origin at the path: %s If the path above is wrong, specify the path with the -origincert option. If you don't have a certificate signed by Cloudflare, run the command: %s login `, originCertPath, os.Args[0]) return "", fmt.Errorf("Cannot find a valid certificate at the path %s", originCertPath) } return originCertPath, nil } func readOriginCert(originCertPath string, logger logger.Service) ([]byte, error) { logger.Debugf("Reading origin cert from %s", originCertPath) // Easier to send the certificate as []byte via RPC than decoding it at this point originCert, err := ioutil.ReadFile(originCertPath) if err != nil { logger.Errorf("Cannot read %s to load origin certificate: %s", originCertPath, err) return nil, fmt.Errorf("Cannot read %s to load origin certificate", originCertPath) } return originCert, nil } func getOriginCert(c *cli.Context, logger logger.Service) ([]byte, error) { if originCertPath, err := findOriginCert(c, logger); err != nil { return nil, err } else { return readOriginCert(originCertPath, logger) } } func prepareTunnelConfig( c *cli.Context, buildInfo *buildinfo.BuildInfo, version string, logger logger.Service, transportLogger logger.Service, ) (*origin.TunnelConfig, error) { hostname, err := validation.ValidateHostname(c.String("hostname")) if err != nil { logger.Errorf("Invalid hostname: %s", err) return nil, errors.Wrap(err, "Invalid hostname") } isFreeTunnel := hostname == "" clientID := c.String("id") if !c.IsSet("id") { clientID, err = generateRandomClientID(logger) if err != nil { return nil, err } } tags, err := NewTagSliceFromCLI(c.StringSlice("tag")) if err != nil { logger.Errorf("Tag parse failure: %s", err) return nil, errors.Wrap(err, "Tag parse failure") } tags = append(tags, tunnelpogs.Tag{Name: "ID", Value: clientID}) originURL, err := config.ValidateUrl(c) if err != nil { logger.Errorf("Error validating origin URL: %s", err) return nil, errors.Wrap(err, "Error validating origin URL") } var originCert []byte if !isFreeTunnel { originCert, err = getOriginCert(c, logger) if err != nil { return nil, errors.Wrap(err, "Error getting origin cert") } } originCertPool, err := tlsconfig.LoadOriginCA(c, logger) if err != nil { logger.Errorf("Error loading cert pool: %s", err) return nil, errors.Wrap(err, "Error loading cert pool") } tunnelMetrics := origin.NewTunnelMetrics() httpTransport := &http.Transport{ Proxy: http.ProxyFromEnvironment, MaxIdleConns: c.Int("proxy-keepalive-connections"), MaxIdleConnsPerHost: c.Int("proxy-keepalive-connections"), IdleConnTimeout: c.Duration("proxy-keepalive-timeout"), TLSHandshakeTimeout: c.Duration("proxy-tls-timeout"), ExpectContinueTimeout: 1 * time.Second, TLSClientConfig: &tls.Config{RootCAs: originCertPool, InsecureSkipVerify: c.IsSet("no-tls-verify")}, } dialer := &net.Dialer{ Timeout: c.Duration("proxy-connect-timeout"), KeepAlive: c.Duration("proxy-tcp-keepalive"), } if c.Bool("proxy-no-happy-eyeballs") { dialer.FallbackDelay = -1 // As of Golang 1.12, a negative delay disables "happy eyeballs" } dialContext := dialer.DialContext if c.IsSet("unix-socket") { unixSocket, err := config.ValidateUnixSocket(c) if err != nil { logger.Errorf("Error validating --unix-socket: %s", err) return nil, errors.Wrap(err, "Error validating --unix-socket") } logger.Infof("Proxying tunnel requests to unix:%s", unixSocket) httpTransport.DialContext = func(ctx context.Context, _, _ string) (net.Conn, error) { // if --unix-socket specified, enforce network type "unix" return dialContext(ctx, "unix", unixSocket) } } else { logger.Infof("Proxying tunnel requests to %s", originURL) httpTransport.DialContext = dialContext } if !c.IsSet("hello-world") && c.IsSet("origin-server-name") { httpTransport.TLSClientConfig.ServerName = c.String("origin-server-name") } // If tunnel running in bastion mode, a connection to origin will not exist until initiated by the client. if !c.IsSet(bastionFlag) { if err = validation.ValidateHTTPService(originURL, hostname, httpTransport); err != nil { logger.Errorf("unable to connect to the origin: %s", err) } } toEdgeTLSConfig, err := tlsconfig.CreateTunnelConfig(c) if err != nil { logger.Errorf("unable to create TLS config to connect with edge: %s", err) return nil, errors.Wrap(err, "unable to create TLS config to connect with edge") } return &origin.TunnelConfig{ BuildInfo: buildInfo, ClientID: clientID, ClientTlsConfig: httpTransport.TLSClientConfig, CompressionQuality: c.Uint64("compression-quality"), EdgeAddrs: c.StringSlice("edge"), GracePeriod: c.Duration("grace-period"), HAConnections: c.Int("ha-connections"), HTTPTransport: httpTransport, HeartbeatInterval: c.Duration("heartbeat-interval"), Hostname: hostname, HTTPHostHeader: c.String("http-host-header"), IncidentLookup: origin.NewIncidentLookup(), IsAutoupdated: c.Bool("is-autoupdated"), IsFreeTunnel: isFreeTunnel, LBPool: c.String("lb-pool"), Logger: logger, TransportLogger: transportLogger, MaxHeartbeats: c.Uint64("heartbeat-count"), Metrics: tunnelMetrics, MetricsUpdateFreq: c.Duration("metrics-update-freq"), NoChunkedEncoding: c.Bool("no-chunked-encoding"), OriginCert: originCert, OriginUrl: originURL, ReportedVersion: version, Retries: c.Uint("retries"), RunFromTerminal: isRunningFromTerminal(), Tags: tags, TlsConfig: toEdgeTLSConfig, UseDeclarativeTunnel: c.Bool("use-declarative-tunnels"), UseReconnectToken: c.Bool("use-reconnect-token"), UseQuickReconnects: c.Bool("use-quick-reconnects"), }, nil } func serviceDiscoverer(c *cli.Context, logger logger.Service) (*edgediscovery.Edge, error) { // If --edge is specfied, resolve edge server addresses if len(c.StringSlice("edge")) > 0 { return edgediscovery.StaticEdge(logger, c.StringSlice("edge")) } // Otherwise lookup edge server addresses through service discovery return edgediscovery.ResolveEdge(logger) } func isRunningFromTerminal() bool { return terminal.IsTerminal(int(os.Stdout.Fd())) }