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

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package tunnel
import (
"crypto/tls"
"fmt"
"io/ioutil"
mathRand "math/rand"
"net"
"net/netip"
"os"
"path/filepath"
"strings"
"time"
"github.com/google/uuid"
homedir "github.com/mitchellh/go-homedir"
"github.com/pkg/errors"
"github.com/rs/zerolog"
"github.com/urfave/cli/v2"
"github.com/urfave/cli/v2/altsrc"
"golang.org/x/crypto/ssh/terminal"
"github.com/cloudflare/cloudflared/cmd/cloudflared/cliutil"
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"github.com/cloudflare/cloudflared/edgediscovery/allregions"
"github.com/cloudflare/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/orchestration"
"github.com/cloudflare/cloudflared/supervisor"
"github.com/cloudflare/cloudflared/tlsconfig"
tunnelpogs "github.com/cloudflare/cloudflared/tunnelrpc/pogs"
"github.com/cloudflare/cloudflared/validation"
)
const LogFieldOriginCertPath = "originCertPath"
const secretValue = "*****"
var (
developerPortal = "https://developers.cloudflare.com/argo-tunnel"
serviceUrl = developerPortal + "/reference/service/"
argumentsUrl = developerPortal + "/reference/arguments/"
LogFieldHostname = "hostname"
secretFlags = [2]*altsrc.StringFlag{credentialsContentsFlag, tunnelTokenFlag}
defaultFeatures = []string{supervisor.FeatureAllowRemoteConfig, supervisor.FeatureSerializedHeaders, supervisor.FeatureDatagramV2, supervisor.FeatureQUICSupportEOF}
configFlags = []string{"autoupdate-freq", "no-autoupdate", "retries", "protocol", "loglevel", "transport-loglevel", "origincert", "metrics", "metrics-update-freq", "edge-ip-version"}
)
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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(log *zerolog.Logger) (string, error) {
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u, err := uuid.NewRandom()
if err != nil {
log.Error().Msgf("couldn't create UUID for client ID %s", err)
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return "", err
}
return u.String(), nil
}
func logClientOptions(c *cli.Context, log *zerolog.Logger) {
flags := make(map[string]interface{})
for _, flag := range c.FlagNames() {
if isSecretFlag(flag) {
flags[flag] = secretValue
} else {
flags[flag] = c.Generic(flag)
}
}
if len(flags) > 0 {
log.Info().Msgf("Settings: %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 {
if isSecretEnvVar(vars[0]) {
envs[vars[0]] = secretValue
} else {
envs[vars[0]] = vars[1]
}
}
}
}
if len(envs) > 0 {
log.Info().Msgf("Environmental variables %v", envs)
}
}
func isSecretFlag(key string) bool {
for _, flag := range secretFlags {
if flag.Name == key {
return true
}
}
return false
}
func isSecretEnvVar(key string) bool {
for _, flag := range secretFlags {
for _, secretEnvVar := range flag.EnvVars {
if secretEnvVar == key {
return true
}
}
}
return false
}
func dnsProxyStandAlone(c *cli.Context, namedTunnel *connection.NamedTunnelProperties) bool {
return c.IsSet("proxy-dns") && (!c.IsSet("hostname") && !c.IsSet("tag") && !c.IsSet("hello-world") && namedTunnel == nil)
}
func findOriginCert(originCertPath string, log *zerolog.Logger) (string, error) {
if originCertPath == "" {
log.Info().Msgf("Cannot determine default origin certificate path. No file %s in %v", config.DefaultCredentialFile, config.DefaultConfigSearchDirectories())
if isRunningFromTerminal() {
log.Error().Msgf("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 {
log.Error().Msgf("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 {
log.Err(err).Msgf("Cannot resolve origin certificate path")
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 {
log.Error().Err(err).Msgf("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 {
log.Error().Msgf(`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) ([]byte, error) {
// Easier to send the certificate as []byte via RPC than decoding it at this point
originCert, err := ioutil.ReadFile(originCertPath)
if err != nil {
return nil, fmt.Errorf("cannot read %s to load origin certificate", originCertPath)
}
return originCert, nil
}
func getOriginCert(originCertPath string, log *zerolog.Logger) ([]byte, error) {
if originCertPath, err := findOriginCert(originCertPath, log); err != nil {
return nil, err
} else {
return readOriginCert(originCertPath)
}
}
func prepareTunnelConfig(
c *cli.Context,
info *cliutil.BuildInfo,
log, logTransport *zerolog.Logger,
observer *connection.Observer,
namedTunnel *connection.NamedTunnelProperties,
) (*supervisor.TunnelConfig, *orchestration.Config, error) {
isNamedTunnel := namedTunnel != nil
configHostname := c.String("hostname")
hostname, err := validation.ValidateHostname(configHostname)
if err != nil {
log.Err(err).Str(LogFieldHostname, configHostname).Msg("Invalid hostname")
return nil, nil, errors.Wrap(err, "Invalid hostname")
}
clientID := c.String("id")
if !c.IsSet("id") {
clientID, err = generateRandomClientID(log)
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if err != nil {
return nil, nil, err
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}
}
tags, err := NewTagSliceFromCLI(c.StringSlice("tag"))
if err != nil {
log.Err(err).Msg("Tag parse failure")
return nil, nil, errors.Wrap(err, "Tag parse failure")
}
tags = append(tags, tunnelpogs.Tag{Name: "ID", Value: clientID})
var (
ingressRules ingress.Ingress
classicTunnel *connection.ClassicTunnelProperties
)
transportProtocol := c.String("protocol")
needPQ := c.Bool("post-quantum")
if needPQ {
if FipsEnabled {
return nil, nil, fmt.Errorf("post-quantum not supported in FIPS mode")
}
// Error if the user tries to force a non-quic transport protocol
if transportProtocol != connection.AutoSelectFlag && transportProtocol != connection.QUIC.String() {
return nil, nil, fmt.Errorf("post-quantum is only supported with the quic transport")
}
transportProtocol = connection.QUIC.String()
}
protocolFetcher := edgediscovery.ProtocolPercentage
cfg := config.GetConfiguration()
if isNamedTunnel {
clientUUID, err := uuid.NewRandom()
if err != nil {
return nil, nil, errors.Wrap(err, "can't generate connector UUID")
}
log.Info().Msgf("Generated Connector ID: %s", clientUUID)
features := append(c.StringSlice("features"), defaultFeatures...)
if needPQ {
features = append(features, supervisor.FeaturePostQuantum)
}
if c.IsSet(TunnelTokenFlag) {
if transportProtocol == connection.AutoSelectFlag {
protocolFetcher = func() (edgediscovery.ProtocolPercents, error) {
// If the Tunnel is remotely managed and no protocol is set, we prefer QUIC, but still allow fall-back.
preferQuic := []edgediscovery.ProtocolPercent{
{
Protocol: connection.QUIC.String(),
Percentage: 100,
},
{
Protocol: connection.HTTP2.String(),
Percentage: 100,
},
}
return preferQuic, nil
}
}
log.Info().Msg("Will be fetching remotely managed configuration from Cloudflare API. Defaulting to protocol: quic")
}
namedTunnel.Client = tunnelpogs.ClientInfo{
ClientID: clientUUID[:],
Features: dedup(features),
Version: info.Version(),
Arch: info.OSArch(),
}
ingressRules, err = ingress.ParseIngress(cfg)
if err != nil && err != ingress.ErrNoIngressRules {
return nil, nil, err
}
if !ingressRules.IsEmpty() && c.IsSet("url") {
return nil, nil, ingress.ErrURLIncompatibleWithIngress
}
} else {
originCertPath := c.String("origincert")
originCertLog := log.With().
Str(LogFieldOriginCertPath, originCertPath).
Logger()
originCert, err := getOriginCert(originCertPath, &originCertLog)
if err != nil {
return nil, nil, errors.Wrap(err, "Error getting origin cert")
}
classicTunnel = &connection.ClassicTunnelProperties{
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)
if err != nil {
return nil, nil, err
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}
}
warpRoutingEnabled := isWarpRoutingEnabled(cfg.WarpRouting, isNamedTunnel)
protocolSelector, err := connection.NewProtocolSelector(transportProtocol, warpRoutingEnabled, namedTunnel, protocolFetcher, supervisor.ResolveTTL, log, c.Bool("post-quantum"))
if err != nil {
return nil, nil, err
}
log.Info().Msgf("Initial protocol %s", protocolSelector.Current())
edgeTLSConfigs := make(map[connection.Protocol]*tls.Config, len(connection.ProtocolList))
for _, p := range connection.ProtocolList {
tlsSettings := p.TLSSettings()
if tlsSettings == nil {
return nil, nil, fmt.Errorf("%s has unknown TLS settings", p)
}
edgeTLSConfig, err := tlsconfig.CreateTunnelConfig(c, tlsSettings.ServerName)
if err != nil {
return nil, nil, errors.Wrap(err, "unable to create TLS config to connect with edge")
}
if len(tlsSettings.NextProtos) > 0 {
edgeTLSConfig.NextProtos = tlsSettings.NextProtos
}
edgeTLSConfigs[p] = edgeTLSConfig
}
gracePeriod, err := gracePeriod(c)
if err != nil {
return nil, nil, err
}
muxerConfig := &connection.MuxerConfig{
HeartbeatInterval: c.Duration("heartbeat-interval"),
// Note TUN-3758 , we use Int because UInt is not supported with altsrc
MaxHeartbeats: uint64(c.Int("heartbeat-count")),
// Note TUN-3758 , we use Int because UInt is not supported with altsrc
CompressionSetting: h2mux.CompressionSetting(uint64(c.Int("compression-quality"))),
MetricsUpdateFreq: c.Duration("metrics-update-freq"),
}
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edgeIPVersion, err := parseConfigIPVersion(c.String("edge-ip-version"))
if err != nil {
return nil, nil, err
}
var pqKexIdx int
if needPQ {
pqKexIdx = mathRand.Intn(len(supervisor.PQKexes))
log.Info().Msgf(
"Using experimental hybrid post-quantum key agreement %s",
supervisor.PQKexNames[supervisor.PQKexes[pqKexIdx]],
)
}
tunnelConfig := &supervisor.TunnelConfig{
GracePeriod: gracePeriod,
ReplaceExisting: c.Bool("force"),
OSArch: info.OSArch(),
ClientID: clientID,
EdgeAddrs: c.StringSlice("edge"),
Region: c.String("region"),
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EdgeIPVersion: edgeIPVersion,
HAConnections: c.Int("ha-connections"),
IncidentLookup: supervisor.NewIncidentLookup(),
IsAutoupdated: c.Bool("is-autoupdated"),
LBPool: c.String("lb-pool"),
Tags: tags,
Log: log,
LogTransport: logTransport,
Observer: observer,
ReportedVersion: info.Version(),
// Note TUN-3758 , we use Int because UInt is not supported with altsrc
Retries: uint(c.Int("retries")),
RunFromTerminal: isRunningFromTerminal(),
NamedTunnel: namedTunnel,
ClassicTunnel: classicTunnel,
MuxerConfig: muxerConfig,
ProtocolSelector: protocolSelector,
EdgeTLSConfigs: edgeTLSConfigs,
NeedPQ: needPQ,
PQKexIdx: pqKexIdx,
}
packetConfig, err := newPacketConfig(c, log)
if err != nil {
log.Warn().Err(err).Msg("ICMP proxy feature is disabled")
} else {
tunnelConfig.PacketConfig = packetConfig
}
orchestratorConfig := &orchestration.Config{
Ingress: &ingressRules,
WarpRouting: ingress.NewWarpRoutingConfig(&cfg.WarpRouting),
ConfigurationFlags: parseConfigFlags(c),
}
return tunnelConfig, orchestratorConfig, nil
}
func parseConfigFlags(c *cli.Context) map[string]string {
result := make(map[string]string)
for _, flag := range configFlags {
if v := c.String(flag); c.IsSet(flag) && v != "" {
result[flag] = v
}
}
return result
}
func gracePeriod(c *cli.Context) (time.Duration, error) {
period := c.Duration("grace-period")
if period > connection.MaxGracePeriod {
return time.Duration(0), fmt.Errorf("grace-period must be equal or less than %v", connection.MaxGracePeriod)
}
return period, nil
}
func isWarpRoutingEnabled(warpConfig config.WarpRoutingConfig, isNamedTunnel bool) bool {
return warpConfig.Enabled && isNamedTunnel
}
func isRunningFromTerminal() bool {
return terminal.IsTerminal(int(os.Stdout.Fd()))
}
// Remove any duplicates from the slice
func dedup(slice []string) []string {
// Convert the slice into a set
set := make(map[string]bool, 0)
for _, str := range slice {
set[str] = true
}
// Convert the set back into a slice
keys := make([]string, len(set))
i := 0
for str := range set {
keys[i] = str
i++
}
return keys
}
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// ParseConfigIPVersion returns the IP version from possible expected values from config
func parseConfigIPVersion(version string) (v allregions.ConfigIPVersion, err error) {
switch version {
case "4":
v = allregions.IPv4Only
case "6":
v = allregions.IPv6Only
case "auto":
v = allregions.Auto
default: // unspecified or invalid
err = fmt.Errorf("invalid value for edge-ip-version: %s", version)
}
return
}
func newPacketConfig(c *cli.Context, logger *zerolog.Logger) (*ingress.GlobalRouterConfig, error) {
ipv4Src, err := determineICMPv4Src(c.String("icmpv4-src"), logger)
if err != nil {
return nil, errors.Wrap(err, "failed to determine IPv4 source address for ICMP proxy")
}
logger.Info().Msgf("ICMP proxy will use %s as source for IPv4", ipv4Src)
ipv6Src, zone, err := determineICMPv6Src(c.String("icmpv6-src"), logger, ipv4Src)
if err != nil {
return nil, errors.Wrap(err, "failed to determine IPv6 source address for ICMP proxy")
}
if zone != "" {
logger.Info().Msgf("ICMP proxy will use %s in zone %s as source for IPv6", ipv6Src, zone)
} else {
logger.Info().Msgf("ICMP proxy will use %s as source for IPv6", ipv6Src)
}
icmpRouter, err := ingress.NewICMPRouter(ipv4Src, ipv6Src, zone, logger)
if err != nil {
return nil, err
}
return &ingress.GlobalRouterConfig{
ICMPRouter: icmpRouter,
IPv4Src: ipv4Src,
IPv6Src: ipv6Src,
Zone: zone,
}, nil
}
func determineICMPv4Src(userDefinedSrc string, logger *zerolog.Logger) (netip.Addr, error) {
if userDefinedSrc != "" {
addr, err := netip.ParseAddr(userDefinedSrc)
if err != nil {
return netip.Addr{}, err
}
if addr.Is4() {
return addr, nil
}
return netip.Addr{}, fmt.Errorf("expect IPv4, but %s is IPv6", userDefinedSrc)
}
addr, err := findLocalAddr(net.ParseIP("192.168.0.1"), 53)
if err != nil {
addr = netip.IPv4Unspecified()
logger.Debug().Err(err).Msgf("Failed to determine the IPv4 for this machine. It will use %s to send/listen for ICMPv4 echo", addr)
}
return addr, nil
}
type interfaceIP struct {
name string
ip net.IP
}
func determineICMPv6Src(userDefinedSrc string, logger *zerolog.Logger, ipv4Src netip.Addr) (addr netip.Addr, zone string, err error) {
if userDefinedSrc != "" {
userDefinedIP, zone, _ := strings.Cut(userDefinedSrc, "%")
addr, err := netip.ParseAddr(userDefinedIP)
if err != nil {
return netip.Addr{}, "", err
}
if addr.Is6() {
return addr, zone, nil
}
return netip.Addr{}, "", fmt.Errorf("expect IPv6, but %s is IPv4", userDefinedSrc)
}
// Loop through all the interfaces, the preference is
// 1. The interface where ipv4Src is in
// 2. Interface with IPv6 address
// 3. Unspecified interface
interfaces, err := net.Interfaces()
if err != nil {
return netip.IPv6Unspecified(), "", nil
}
interfacesWithIPv6 := make([]interfaceIP, 0)
for _, interf := range interfaces {
interfaceAddrs, err := interf.Addrs()
if err != nil {
continue
}
foundIPv4SrcInterface := false
for _, interfaceAddr := range interfaceAddrs {
if ipnet, ok := interfaceAddr.(*net.IPNet); ok {
ip := ipnet.IP
if ip.Equal(ipv4Src.AsSlice()) {
foundIPv4SrcInterface = true
}
if ip.To4() == nil {
interfacesWithIPv6 = append(interfacesWithIPv6, interfaceIP{
name: interf.Name,
ip: ip,
})
}
}
}
// Found the interface of ipv4Src. Loop through the addresses to see if there is an IPv6
if foundIPv4SrcInterface {
for _, interfaceAddr := range interfaceAddrs {
if ipnet, ok := interfaceAddr.(*net.IPNet); ok {
ip := ipnet.IP
if ip.To4() == nil {
addr, err := netip.ParseAddr(ip.String())
if err == nil {
return addr, interf.Name, nil
}
}
}
}
}
}
for _, interf := range interfacesWithIPv6 {
addr, err := netip.ParseAddr(interf.ip.String())
if err == nil {
return addr, interf.name, nil
}
}
logger.Debug().Err(err).Msgf("Failed to determine the IPv6 for this machine. It will use %s to send/listen for ICMPv6 echo", netip.IPv6Unspecified())
return netip.IPv6Unspecified(), "", nil
}
// FindLocalAddr tries to dial UDP and returns the local address picked by the OS
func findLocalAddr(dst net.IP, port int) (netip.Addr, error) {
udpConn, err := net.DialUDP("udp", nil, &net.UDPAddr{
IP: dst,
Port: port,
})
if err != nil {
return netip.Addr{}, err
}
defer udpConn.Close()
localAddrPort, err := netip.ParseAddrPort(udpConn.LocalAddr().String())
if err != nil {
return netip.Addr{}, err
}
localAddr := localAddrPort.Addr()
return localAddr, nil
}