90 lines
2.6 KiB
Go
90 lines
2.6 KiB
Go
package application
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import (
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"context"
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"crypto/tls"
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"net/http"
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"net/http/httputil"
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"net/url"
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"time"
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"github.com/getsentry/sentry-go"
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"github.com/prometheus/client_golang/prometheus"
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log "github.com/sirupsen/logrus"
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"goauthentik.io/internal/outpost/proxyv2/metrics"
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"goauthentik.io/internal/utils/web"
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)
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func (a *Application) getUpstreamTransport() http.RoundTripper {
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return &http.Transport{
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TLSClientConfig: &tls.Config{InsecureSkipVerify: !*a.proxyConfig.InternalHostSslValidation},
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}
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}
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func (a *Application) configureProxy() error {
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// Reverse proxy to the application server
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u, err := url.Parse(*a.proxyConfig.InternalHost)
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if err != nil {
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return err
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}
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rp := &httputil.ReverseProxy{Director: a.proxyModifyRequest(u)}
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rsp := sentry.StartSpan(context.TODO(), "authentik.outposts.proxy.application_transport")
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rp.Transport = web.NewTracingTransport(rsp.Context(), a.getUpstreamTransport())
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rp.ErrorHandler = a.newProxyErrorHandler()
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rp.ModifyResponse = a.proxyModifyResponse
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a.mux.PathPrefix("/").HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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claims, err := a.getClaims(r)
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if claims == nil && a.IsAllowlisted(r.URL) {
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a.log.Trace("path can be accessed without authentication")
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} else if claims == nil && err != nil {
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a.redirectToStart(rw, r)
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return
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} else {
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a.addHeaders(r.Header, claims)
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}
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before := time.Now()
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rp.ServeHTTP(rw, r)
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defer func() {
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err := recover()
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if err == nil || err == http.ErrAbortHandler {
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return
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}
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log.WithError(err.(error)).Error("recover in reverse proxy")
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}()
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after := time.Since(before)
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metrics.UpstreamTiming.With(prometheus.Labels{
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"outpost_name": a.outpostName,
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"upstream_host": r.URL.Host,
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"method": r.Method,
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"scheme": r.URL.Scheme,
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"host": web.GetHost(r),
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}).Observe(float64(after))
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})
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return nil
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}
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func (a *Application) proxyModifyRequest(ou *url.URL) func(req *http.Request) {
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return func(r *http.Request) {
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r.Header.Set("X-Forwarded-Host", r.Host)
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claims, _ := a.getClaims(r)
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r.URL.Scheme = ou.Scheme
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r.URL.Host = ou.Host
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if claims != nil && claims.Proxy != nil && claims.Proxy.BackendOverride != "" {
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u, err := url.Parse(claims.Proxy.BackendOverride)
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if err != nil {
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a.log.WithField("backend_override", claims.Proxy.BackendOverride).WithError(err).Warning("failed parse user backend override")
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} else {
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r.URL.Scheme = u.Scheme
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r.URL.Host = u.Host
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}
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}
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a.log.WithField("upstream_url", r.URL.String()).Trace("final upstream url")
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}
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}
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func (a *Application) proxyModifyResponse(res *http.Response) error {
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res.Header.Set("X-Powered-By", "authentik_proxy2")
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return nil
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}
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