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authentik/internal/web/proxy.go

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package web
import (
"encoding/json"
"errors"
"fmt"
"net/http"
"net/http/httputil"
"time"
"github.com/prometheus/client_golang/prometheus"
"goauthentik.io/internal/utils/sentry"
)
func (ws *WebServer) configureProxy() {
// Reverse proxy to the application server
director := func(req *http.Request) {
req.URL.Scheme = ws.ul.Scheme
req.URL.Host = ws.ul.Host
if _, ok := req.Header["User-Agent"]; !ok {
// explicitly disable User-Agent so it's not set to default value
req.Header.Set("User-Agent", "")
}
if req.TLS != nil {
req.Header.Set("X-Forwarded-Proto", "https")
}
ws.log.WithField("url", req.URL.String()).WithField("headers", req.Header).Trace("tracing request to backend")
}
rp := &httputil.ReverseProxy{
Director: director,
Transport: ws.upstreamHttpClient().Transport,
}
rp.ErrorHandler = ws.proxyErrorHandler
rp.ModifyResponse = ws.proxyModifyResponse
ws.m.Path("/-/health/live/").HandlerFunc(sentry.SentryNoSample(func(rw http.ResponseWriter, r *http.Request) {
rw.WriteHeader(204)
}))
ws.m.PathPrefix("/").HandlerFunc(sentry.SentryNoSample(func(rw http.ResponseWriter, r *http.Request) {
if !ws.g.IsRunning() {
ws.proxyErrorHandler(rw, r, errors.New("authentik starting"))
return
}
before := time.Now()
if ws.ProxyServer != nil && ws.ProxyServer.HandleHost(rw, r) {
elapsed := time.Since(before)
Requests.With(prometheus.Labels{
"dest": "embedded_outpost",
}).Observe(float64(elapsed) / float64(time.Second))
return
}
elapsed := time.Since(before)
Requests.With(prometheus.Labels{
"dest": "core",
}).Observe(float64(elapsed) / float64(time.Second))
r.Body = http.MaxBytesReader(rw, r.Body, 32*1024*1024)
rp.ServeHTTP(rw, r)
}))
}
func (ws *WebServer) proxyErrorHandler(rw http.ResponseWriter, req *http.Request, err error) {
ws.log.WithError(err).Warning("failed to proxy to backend")
rw.WriteHeader(http.StatusBadGateway)
em := fmt.Sprintf("failed to connect to authentik backend: %v", err)
// return json if the client asks for json
if req.Header.Get("Accept") == "application/json" {
err = json.NewEncoder(rw).Encode(map[string]string{
"error": em,
})
} else {
_, err = rw.Write([]byte(em))
}
if err != nil {
ws.log.WithError(err).Warning("failed to write error message")
}
}
func (ws *WebServer) proxyModifyResponse(r *http.Response) error {
r.Header.Set("X-Powered-By", "authentik")
r.Header.Del("Server")
return nil
}