cloudflared-mirror/tlsconfig/tlsconfig.go

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// Package tlsconfig provides convenience functions for configuring TLS connections from the
// command line.
package tlsconfig
import (
"crypto/tls"
"crypto/x509"
"io/ioutil"
"net"
"github.com/cloudflare/cloudflared/log"
"github.com/pkg/errors"
"gopkg.in/urfave/cli.v2"
)
var logger = log.CreateLogger()
// CLIFlags names the flags used to configure TLS for a command or subsystem.
// The nil value for a field means the flag is ignored.
type CLIFlags struct {
Cert string
Key string
ClientCert string
RootCA string
}
// GetConfig returns a TLS configuration according to the flags defined in f and
// set by the user.
func (f CLIFlags) GetConfig(c *cli.Context) *tls.Config {
config := &tls.Config{}
if c.IsSet(f.Cert) && c.IsSet(f.Key) {
cert, err := tls.LoadX509KeyPair(c.String(f.Cert), c.String(f.Key))
if err != nil {
logger.WithError(err).Fatal("Error parsing X509 key pair")
}
config.Certificates = []tls.Certificate{cert}
config.BuildNameToCertificate()
}
return f.finishGettingConfig(c, config)
}
func (f CLIFlags) GetConfigReloadableCert(c *cli.Context, cr *CertReloader) *tls.Config {
config := &tls.Config{
GetCertificate: cr.Cert,
}
config.BuildNameToCertificate()
return f.finishGettingConfig(c, config)
}
func (f CLIFlags) finishGettingConfig(c *cli.Context, config *tls.Config) *tls.Config {
if c.IsSet(f.ClientCert) {
// set of root certificate authorities that servers use if required to verify a client certificate
// by the policy in ClientAuth
config.ClientCAs = LoadCert(c.String(f.ClientCert))
// server's policy for TLS Client Authentication. Default is no client cert
config.ClientAuth = tls.RequireAndVerifyClientCert
}
// set of root certificate authorities that clients use when verifying server certificates
if c.IsSet(f.RootCA) {
config.RootCAs = LoadCert(c.String(f.RootCA))
}
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// we optimize CurveP256
config.CurvePreferences = []tls.CurveID{tls.CurveP256}
return config
}
// LoadCert creates a CertPool containing all certificates in a PEM-format file.
func LoadCert(certPath string) *x509.CertPool {
caCert, err := ioutil.ReadFile(certPath)
if err != nil {
logger.WithError(err).Fatalf("Error reading certificate %s", certPath)
}
ca := x509.NewCertPool()
if !ca.AppendCertsFromPEM(caCert) {
logger.WithError(err).Fatalf("Error parsing certificate %s", certPath)
}
return ca
}
func LoadGlobalCertPool() (*x509.CertPool, error) {
success := false
// First, obtain the system certificate pool
certPool, systemCertPoolErr := x509.SystemCertPool()
if systemCertPoolErr != nil {
logger.Warnf("error obtaining the system certificates: %s", systemCertPoolErr)
certPool = x509.NewCertPool()
} else {
success = true
}
// Next, append the Cloudflare CA pool into the system pool
if !certPool.AppendCertsFromPEM(cloudflareRootCA) {
logger.Warn("could not append the CF certificate to the cloudflared certificate pool")
} else {
success = true
}
if success != true { // Obtaining any of the CAs has failed; this is a fatal error
return nil, errors.New("error loading any of the CAs into the global certificate pool")
}
// Finally, add the Hello certificate into the pool (since it's self-signed)
helloCertificate, err := GetHelloCertificateX509()
if err != nil {
logger.Warn("error obtaining the Hello server certificate")
}
certPool.AddCert(helloCertificate)
return certPool, nil
}
func LoadOriginCertPool(originCAPoolPEM []byte) (*x509.CertPool, error) {
success := false
// Get the global pool
certPool, globalPoolErr := LoadGlobalCertPool()
if globalPoolErr != nil {
certPool = x509.NewCertPool()
} else {
success = true
}
// Then, add any custom origin CA pool the user may have passed
if originCAPoolPEM != nil {
if !certPool.AppendCertsFromPEM(originCAPoolPEM) {
logger.Warn("could not append the provided origin CA to the cloudflared certificate pool")
} else {
success = true
}
}
if success != true {
return nil, errors.New("error loading any of the CAs into the origin certificate pool")
}
return certPool, nil
}
func CreateTunnelConfig(c *cli.Context, addrs []string) *tls.Config {
tlsConfig := CLIFlags{RootCA: "cacert"}.GetConfig(c)
if tlsConfig.RootCAs == nil {
tlsConfig.RootCAs = GetCloudflareRootCA()
tlsConfig.ServerName = "cftunnel.com"
} else if len(addrs) > 0 {
// Set for development environments and for testing specific origintunneld instances
tlsConfig.ServerName, _, _ = net.SplitHostPort(addrs[0])
}
return tlsConfig
}