cloudflared-mirror/cmd/cloudflared/tunnel/configuration.go

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package tunnel
import (
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"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"
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"github.com/google/uuid"
"github.com/mitchellh/go-homedir"
"github.com/pkg/errors"
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"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) {
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u, err := uuid.NewRandom()
if err != nil {
logger.Errorf("couldn't create UUID for client ID %s", err)
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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") {
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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{
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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{
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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
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if c.IsSet("unix-socket") {
unixSocket, err := config.ValidateUnixSocket(c)
if err != nil {
logger.Errorf("Error validating --unix-socket: %s", err)
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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")
}
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// 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)
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}
}
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()))
}