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

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package tunnel
import (
"crypto/tls"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/cloudflare/cloudflared/cmd/cloudflared/buildinfo"
"github.com/cloudflare/cloudflared/cmd/cloudflared/config"
"github.com/cloudflare/cloudflared/connection"
"github.com/cloudflare/cloudflared/edgediscovery"
"github.com/cloudflare/cloudflared/h2mux"
"github.com/cloudflare/cloudflared/ingress"
"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"
"github.com/urfave/cli/v2"
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"golang.org/x/crypto/ssh/terminal"
)
var (
developerPortal = "https://developers.cloudflare.com/argo-tunnel"
quickStartUrl = developerPortal + "/quickstart/quickstart/"
serviceUrl = developerPortal + "/reference/service/"
argumentsUrl = developerPortal + "/reference/arguments/"
)
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// returns the first path that contains a cert.pem file. If none of the DefaultConfigSearchDirectories
// contains a cert.pem file, return empty string
func findDefaultOriginCertPath() string {
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for _, defaultConfigDir := range config.DefaultConfigSearchDirectories() {
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.DefaultConfigSearchDirectories())
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,
namedTunnel *connection.NamedTunnelConfig,
isUIEnabled bool,
eventChans []chan connection.Event,
) (*origin.TunnelConfig, ingress.Ingress, error) {
isNamedTunnel := namedTunnel != nil
hostname, err := validation.ValidateHostname(c.String("hostname"))
if err != nil {
logger.Errorf("Invalid hostname: %s", err)
return nil, ingress.Ingress{}, 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, ingress.Ingress{}, err
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}
}
tags, err := NewTagSliceFromCLI(c.StringSlice("tag"))
if err != nil {
logger.Errorf("Tag parse failure: %s", err)
return nil, ingress.Ingress{}, errors.Wrap(err, "Tag parse failure")
}
tags = append(tags, tunnelpogs.Tag{Name: "ID", Value: clientID})
var originCert []byte
if !isFreeTunnel {
originCert, err = getOriginCert(c, logger)
if err != nil {
return nil, ingress.Ingress{}, errors.Wrap(err, "Error getting origin cert")
}
}
var (
ingressRules ingress.Ingress
classicTunnel *connection.ClassicTunnelConfig
)
if isNamedTunnel {
clientUUID, err := uuid.NewRandom()
if err != nil {
return nil, ingress.Ingress{}, errors.Wrap(err, "can't generate clientUUID")
}
namedTunnel.Client = tunnelpogs.ClientInfo{
ClientID: clientUUID[:],
Features: []string{origin.FeatureSerializedHeaders},
Version: version,
Arch: fmt.Sprintf("%s_%s", buildInfo.GoOS, buildInfo.GoArch),
}
ingressRules, err = ingress.ParseIngress(config.GetConfiguration())
if err != nil && err != ingress.ErrNoIngressRules {
return nil, ingress.Ingress{}, err
}
if !ingressRules.IsEmpty() && c.IsSet("url") {
return nil, ingress.Ingress{}, ingress.ErrURLIncompatibleWithIngress
}
} else {
classicTunnel = &connection.ClassicTunnelConfig{
Hostname: hostname,
OriginCert: originCert,
// turn off use of reconnect token and auth refresh when using named tunnels
UseReconnectToken: !isNamedTunnel && c.Bool("use-reconnect-token"),
}
}
// Convert single-origin configuration into multi-origin configuration.
if ingressRules.IsEmpty() {
ingressRules, err = ingress.NewSingleOrigin(c, !isNamedTunnel, logger)
if err != nil {
return nil, ingress.Ingress{}, err
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}
}
protocolSelector, err := connection.NewProtocolSelector(c.String("protocol"), namedTunnel, edgediscovery.HTTP2Percentage, origin.ResolveTTL, logger)
if err != nil {
return nil, ingress.Ingress{}, err
}
logger.Infof("Initial protocol %s", protocolSelector.Current())
edgeTLSConfigs := make(map[connection.Protocol]*tls.Config, len(connection.ProtocolList))
for _, p := range connection.ProtocolList {
edgeTLSConfig, err := tlsconfig.CreateTunnelConfig(c, p.ServerName())
if err != nil {
return nil, ingress.Ingress{}, errors.Wrap(err, "unable to create TLS config to connect with edge")
}
edgeTLSConfigs[p] = edgeTLSConfig
}
originClient := origin.NewClient(ingressRules, tags, logger)
connectionConfig := &connection.Config{
OriginClient: originClient,
GracePeriod: c.Duration("grace-period"),
ReplaceExisting: c.Bool("force"),
}
muxerConfig := &connection.MuxerConfig{
HeartbeatInterval: c.Duration("heartbeat-interval"),
MaxHeartbeats: c.Uint64("heartbeat-count"),
CompressionSetting: h2mux.CompressionSetting(c.Uint64("compression-quality")),
MetricsUpdateFreq: c.Duration("metrics-update-freq"),
}
return &origin.TunnelConfig{
ConnectionConfig: connectionConfig,
BuildInfo: buildInfo,
ClientID: clientID,
EdgeAddrs: c.StringSlice("edge"),
HAConnections: c.Int("ha-connections"),
IncidentLookup: origin.NewIncidentLookup(),
IsAutoupdated: c.Bool("is-autoupdated"),
IsFreeTunnel: isFreeTunnel,
LBPool: c.String("lb-pool"),
Tags: tags,
Logger: logger,
Observer: connection.NewObserver(transportLogger, eventChans, isUIEnabled),
ReportedVersion: version,
Retries: c.Uint("retries"),
RunFromTerminal: isRunningFromTerminal(),
NamedTunnel: namedTunnel,
ClassicTunnel: classicTunnel,
MuxerConfig: muxerConfig,
TunnelEventChans: eventChans,
ProtocolSelector: protocolSelector,
EdgeTLSConfigs: edgeTLSConfigs,
}, ingressRules, nil
}
func isRunningFromTerminal() bool {
return terminal.IsTerminal(int(os.Stdout.Fd()))
}