/
route_service_server.go
211 lines (175 loc) · 5.45 KB
/
route_service_server.go
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package router
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"math/big"
"net"
"net/http"
"time"
"code.cloudfoundry.org/gorouter/config"
)
type CertType int
const (
isCA CertType = iota
isServer
isClient
)
type RouteServicesServer struct {
listener net.Listener
port string
rootCA *x509.CertPool
clientCert tls.Certificate
serverCert tls.Certificate
}
func NewRouteServicesServer(cfg *config.Config) (*RouteServicesServer, error) {
caCert, caPriv, err := createCA()
if err != nil {
return nil, fmt.Errorf("create ca: %s", err)
}
rootCertPool := x509.NewCertPool()
rootCertPool.AddCert(caCert)
clientCert, err := createCertificate(caCert, caPriv, isClient)
if err != nil {
return nil, fmt.Errorf("create client certificate: %s", err)
}
serverCert, err := createCertificate(caCert, caPriv, isServer)
if err != nil {
return nil, fmt.Errorf("create server certificate: %s", err)
}
l, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%d", cfg.RouteServicesServerPort))
if err != nil {
return nil, fmt.Errorf("starting local listener: %s", err)
}
_, port, err := net.SplitHostPort(l.Addr().String())
if err != nil {
return nil, fmt.Errorf("splitting host and port: %s", err)
}
return &RouteServicesServer{
listener: l,
port: port,
rootCA: rootCertPool,
clientCert: clientCert,
serverCert: serverCert,
}, nil
}
func (rs *RouteServicesServer) Serve(handler http.Handler, errChan chan error) error {
localServer := &http.Server{
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
handler.ServeHTTP(w, r)
}),
}
tlsConfig := &tls.Config{
ClientAuth: tls.RequireAndVerifyClientCert,
Certificates: []tls.Certificate{rs.serverCert},
ClientCAs: rs.rootCA,
}
go func() {
err := localServer.Serve(tls.NewListener(rs.listener, tlsConfig))
errChan <- err
}()
return nil
}
func (rs *RouteServicesServer) Stop() {
rs.listener.Close()
}
func (rs *RouteServicesServer) GetRoundTripper() RouteServiceRoundTripper {
return RouteServiceRoundTripper{
port: rs.port,
transport: &http.Transport{
TLSClientConfig: &tls.Config{
Certificates: []tls.Certificate{rs.clientCert},
RootCAs: rs.rootCA,
},
},
}
}
type RouteServiceRoundTripper struct {
port string
transport http.RoundTripper
}
func (rc RouteServiceRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
req.URL.Scheme = "https"
req.URL.Host = fmt.Sprintf("127.0.0.1:%s", rc.port)
return rc.transport.RoundTrip(req)
}
func createCA() (*x509.Certificate, *ecdsa.PrivateKey, error) {
caPriv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return nil, nil, fmt.Errorf("generate key: %s", err)
}
tmpl, err := createCertTemplate(isCA)
if err != nil {
return nil, nil, fmt.Errorf("create cert template: %s", err)
}
caDER, err := x509.CreateCertificate(rand.Reader, &tmpl, &tmpl, &caPriv.PublicKey, caPriv)
if err != nil {
return nil, nil, fmt.Errorf("creating certificate: %s", err)
}
caCert, err := x509.ParseCertificate(caDER)
if err != nil {
return nil, nil, fmt.Errorf("parsing ca cert: %s", err)
}
return caCert, caPriv, nil
}
func createCertificate(rootCert *x509.Certificate, caPriv *ecdsa.PrivateKey, certType CertType) (tls.Certificate, error) {
certPriv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return tls.Certificate{}, fmt.Errorf("generate key: %s", err)
}
certTemplate, err := createCertTemplate(certType)
if err != nil {
return tls.Certificate{}, fmt.Errorf("create cert template: %s", err)
}
certDER, err := x509.CreateCertificate(rand.Reader, &certTemplate, rootCert, &certPriv.PublicKey, caPriv)
if err != nil {
return tls.Certificate{}, fmt.Errorf("x509 create certificate: %s", err)
}
privBytes, err := x509.MarshalECPrivateKey(certPriv)
if err != nil {
return tls.Certificate{}, fmt.Errorf("marshal ec private key: %s", err)
}
keyPEM := pem.EncodeToMemory(&pem.Block{
Type: "EC PRIVATE KEY", Bytes: privBytes,
})
certPEM := pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE", Bytes: certDER,
})
x509KeyPair, err := tls.X509KeyPair(certPEM, keyPEM)
if err != nil {
return tls.Certificate{}, fmt.Errorf("making x509 key pair: %s", err)
}
return x509KeyPair, nil
}
func createCertTemplate(certType CertType) (x509.Certificate, error) {
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return x509.Certificate{}, fmt.Errorf("random int: %s", err)
}
tmpl := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{Organization: []string{"Route Services"}},
SignatureAlgorithm: x509.ECDSAWithSHA256,
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(10, 0, 0), // valid for ten years: hopefully no one tries to run a single gorouter for that long without restarting!
BasicConstraintsValid: true,
IPAddresses: []net.IP{net.ParseIP("127.0.0.1")},
}
switch certType {
case isCA:
tmpl.IsCA = true
tmpl.KeyUsage = x509.KeyUsageCertSign | x509.KeyUsageDigitalSignature
tmpl.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth}
case isServer:
tmpl.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}
case isClient:
tmpl.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth}
}
return tmpl, err
}