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authentik/internal/outpost/proxyv2/proxyv2.go

202 lines
5.4 KiB
Go

package proxyv2
import (
"context"
"crypto/tls"
"errors"
"fmt"
"net"
"net/http"
"sync"
"time"
"github.com/gorilla/mux"
"github.com/pires/go-proxyproto"
log "github.com/sirupsen/logrus"
"goauthentik.io/api"
"goauthentik.io/internal/crypto"
"goauthentik.io/internal/outpost/ak"
"goauthentik.io/internal/outpost/proxyv2/application"
"goauthentik.io/internal/outpost/proxyv2/metrics"
"goauthentik.io/internal/utils/web"
)
type ProxyServer struct {
Listen string
PortOffset int
defaultCert tls.Certificate
stop chan struct{} // channel for waiting shutdown
cryptoStore *ak.CryptoStore
apps map[string]*application.Application
log *log.Entry
mux *mux.Router
akAPI *ak.APIController
}
func NewProxyServer(ac *ak.APIController, portOffset int) *ProxyServer {
l := log.WithField("logger", "authentik.outpost.proxyv2")
defaultCert, err := crypto.GenerateSelfSignedCert()
if err != nil {
l.Fatal(err)
}
rootMux := mux.NewRouter()
rootMux.Use(func(h http.Handler) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
h.ServeHTTP(rw, r)
rw.Header().Set("Server", "authentik_proxy2")
})
})
globalMux := rootMux.NewRoute().Subrouter()
globalMux.Use(web.NewLoggingHandler(l.WithField("logger", "authentik.outpost.proxyv2.http"), nil))
s := &ProxyServer{
Listen: "0.0.0.0:%d",
PortOffset: portOffset,
cryptoStore: ak.NewCryptoStore(ac.Client.CryptoApi),
apps: make(map[string]*application.Application),
log: l,
mux: rootMux,
akAPI: ac,
defaultCert: defaultCert,
}
globalMux.PathPrefix("/akprox/static").HandlerFunc(s.HandleStatic)
rootMux.PathPrefix("/").HandlerFunc(s.Handle)
return s
}
func (ps *ProxyServer) HandleHost(host string, rw http.ResponseWriter, r *http.Request) bool {
if app, ok := ps.apps[host]; ok {
if app.Mode() == api.PROXYMODE_PROXY {
ps.log.WithField("host", host).Trace("routing to proxy outpost")
app.ServeHTTP(rw, r)
return true
}
}
return false
}
func (ps *ProxyServer) TimerFlowCacheExpiry() {}
func (ps *ProxyServer) getCertificates(info *tls.ClientHelloInfo) (*tls.Certificate, error) {
app, ok := ps.apps[info.ServerName]
if !ok {
ps.log.WithField("server-name", info.ServerName).Debug("app does not exist")
return &ps.defaultCert, nil
}
if app.Cert == nil {
ps.log.WithField("server-name", info.ServerName).Debug("app does not have a certificate")
return &ps.defaultCert, nil
}
return app.Cert, nil
}
// ServeHTTP constructs a net.Listener and starts handling HTTP requests
func (ps *ProxyServer) ServeHTTP() {
listenAddress := fmt.Sprintf(ps.Listen, 9000+ps.PortOffset)
listener, err := net.Listen("tcp", listenAddress)
if err != nil {
ps.log.Fatalf("FATAL: listen (%s) failed - %s", listenAddress, err)
}
proxyListener := &proxyproto.Listener{Listener: listener}
defer proxyListener.Close()
ps.log.Printf("listening on %s", listener.Addr())
ps.serve(proxyListener)
ps.log.Printf("closing %s", listener.Addr())
}
// ServeHTTPS constructs a net.Listener and starts handling HTTPS requests
func (ps *ProxyServer) ServeHTTPS() {
listenAddress := fmt.Sprintf(ps.Listen, 9443+ps.PortOffset)
config := &tls.Config{
MinVersion: tls.VersionTLS12,
MaxVersion: tls.VersionTLS12,
GetCertificate: ps.getCertificates,
}
ln, err := net.Listen("tcp", listenAddress)
if err != nil {
ps.log.Fatalf("listen (%s) failed - %s", listenAddress, err)
}
ps.log.Printf("listening on %s", ln.Addr())
proxyListener := &proxyproto.Listener{Listener: tcpKeepAliveListener{ln.(*net.TCPListener)}}
defer proxyListener.Close()
tlsListener := tls.NewListener(proxyListener, config)
ps.serve(tlsListener)
ps.log.Printf("closing %s", tlsListener.Addr())
}
func (ps *ProxyServer) Start() error {
wg := sync.WaitGroup{}
wg.Add(3)
go func() {
defer wg.Done()
ps.log.Debug("Starting HTTP Server...")
ps.ServeHTTP()
}()
go func() {
defer wg.Done()
ps.log.Debug("Starting HTTPs Server...")
ps.ServeHTTPS()
}()
go func() {
defer wg.Done()
ps.log.Debug("Starting Metrics Server...")
metrics.RunServer()
}()
return nil
}
func (ps *ProxyServer) serve(listener net.Listener) {
srv := &http.Server{Handler: ps.mux}
// See https://golang.org/pkg/net/http/#Server.Shutdown
idleConnsClosed := make(chan struct{})
go func() {
<-ps.stop // wait notification for stopping server
// We received an interrupt signal, shut down.
if err := srv.Shutdown(context.Background()); err != nil {
// Error from closing listeners, or context timeout:
ps.log.Printf("HTTP server Shutdown: %v", err)
}
close(idleConnsClosed)
}()
err := srv.Serve(listener)
if err != nil && !errors.Is(err, http.ErrServerClosed) {
ps.log.Errorf("ERROR: http.Serve() - %s", err)
}
<-idleConnsClosed
}
// tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
// connections. It's used by ListenAndServe and ListenAndServeTLS so
// dead TCP connections (e.g. closing laptop mid-download) eventually
// go away.
type tcpKeepAliveListener struct {
*net.TCPListener
}
func (ln tcpKeepAliveListener) Accept() (net.Conn, error) {
tc, err := ln.AcceptTCP()
if err != nil {
return nil, err
}
err = tc.SetKeepAlive(true)
if err != nil {
log.Printf("Error setting Keep-Alive: %v", err)
}
err = tc.SetKeepAlivePeriod(3 * time.Minute)
if err != nil {
log.Printf("Error setting Keep-Alive period: %v", err)
}
return tc, nil
}