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authentik/outpost/pkg/proxy/server.go

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package proxy
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import (
"context"
"crypto/tls"
"errors"
"net"
"net/http"
"strings"
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"time"
log "github.com/sirupsen/logrus"
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"goauthentik.io/outpost/pkg/ak"
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)
// Server represents an HTTP server
type Server struct {
Handlers map[string]*providerBundle
stop chan struct{} // channel for waiting shutdown
logger *log.Entry
ak *ak.APIController
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defaultCert tls.Certificate
}
// NewServer initialise a new HTTP Server
func NewServer(ac *ak.APIController) *Server {
defaultCert, err := ak.GenerateSelfSignedCert()
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if err != nil {
log.Warning(err)
}
return &Server{
Handlers: make(map[string]*providerBundle),
logger: log.WithField("logger", "authentik.outpost.proxy-http-server"),
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defaultCert: defaultCert,
ak: ac,
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}
}
func (s *Server) handler(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path == "/akprox/ping" {
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w.WriteHeader(204)
return
}
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handler, ok := s.Handlers[r.Host]
if !ok {
// If we only have one handler, host name switching doesn't matter
if len(s.Handlers) == 1 {
for k := range s.Handlers {
s.Handlers[k].ServeHTTP(w, r)
return
}
}
// Get a list of all host keys we know
hostKeys := make([]string, 0, len(s.Handlers))
for k := range s.Handlers {
hostKeys = append(hostKeys, k)
}
s.logger.WithField("host", r.Host).WithField("known-hosts", strings.Join(hostKeys, ", ")).Debug("Host header does not match any we know of")
w.WriteHeader(404)
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return
}
handler.ServeHTTP(w, r)
}
func (s *Server) serve(listener net.Listener) {
srv := &http.Server{Handler: http.HandlerFunc(s.handler)}
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// See https://golang.org/pkg/net/http/#Server.Shutdown
idleConnsClosed := make(chan struct{})
go func() {
<-s.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:
s.logger.Printf("HTTP server Shutdown: %v", err)
}
close(idleConnsClosed)
}()
err := srv.Serve(listener)
if err != nil && !errors.Is(err, http.ErrServerClosed) {
s.logger.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
}