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