93 lines
3.0 KiB
Go
93 lines
3.0 KiB
Go
package application
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import (
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"fmt"
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"net/http"
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"net/url"
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"goauthentik.io/api"
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"goauthentik.io/internal/outpost/proxyv2/constants"
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"goauthentik.io/internal/utils/web"
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)
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func (a *Application) configureForward() error {
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a.mux.HandleFunc("/akprox/auth", func(rw http.ResponseWriter, r *http.Request) {
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if _, ok := r.URL.Query()["traefik"]; ok {
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a.forwardHandleTraefik(rw, r)
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return
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}
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a.forwardHandleNginx(rw, r)
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})
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a.mux.HandleFunc("/akprox/auth/traefik", a.forwardHandleTraefik)
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a.mux.HandleFunc("/akprox/auth/nginx", a.forwardHandleNginx)
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return nil
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}
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func (a *Application) forwardHandleTraefik(rw http.ResponseWriter, r *http.Request) {
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claims, err := a.getClaims(r)
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if claims != nil && err == nil {
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a.addHeaders(rw.Header(), claims)
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rw.Header().Set("User-Agent", r.Header.Get("User-Agent"))
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a.log.WithField("headers", rw.Header()).Trace("headers written to forward_auth")
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return
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} else if claims == nil && a.IsAllowlisted(r) {
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a.log.Trace("path can be accessed without authentication")
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return
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}
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host := ""
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s, _ := a.sessions.Get(r, constants.SeesionName)
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// Optional suffix, which is appended to the URL
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if *a.proxyConfig.Mode == api.PROXYMODE_FORWARD_SINGLE {
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host = web.GetHost(r)
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} else if *a.proxyConfig.Mode == api.PROXYMODE_FORWARD_DOMAIN {
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eh, _ := url.Parse(a.proxyConfig.ExternalHost)
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host = eh.Host
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}
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// set the redirect flag to the current URL we have, since we redirect
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// to a (possibly) different domain, but we want to be redirected back
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// to the application
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// see https://doc.traefik.io/traefik/middlewares/forwardauth/
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// X-Forwarded-Uri is only the path, so we need to build the entire URL
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s.Values[constants.SessionRedirect] = fmt.Sprintf(
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"%s://%s%s",
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r.Header.Get("X-Forwarded-Proto"),
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r.Header.Get("X-Forwarded-Host"),
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r.Header.Get("X-Forwarded-Uri"),
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)
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if r.Header.Get("X-Forwarded-Uri") == "/akprox/start" {
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a.log.Info("Detected potential redirect loop")
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if val, ok := s.Values[constants.SessionLoopDetection]; !ok {
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s.Values[constants.SessionLoopDetection] = 1
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} else {
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s.Values[constants.SessionLoopDetection] = val.(int) + 1
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}
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}
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err = s.Save(r, rw)
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if err != nil {
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a.log.WithError(err).Warning("failed to save session before redirect")
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}
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proto := r.Header.Get("X-Forwarded-Proto")
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if proto != "" {
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proto = proto + ":"
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}
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rdFinal := fmt.Sprintf("%s//%s%s", proto, host, "/akprox/start")
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a.log.WithField("url", rdFinal).Debug("Redirecting to login")
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http.Redirect(rw, r, rdFinal, http.StatusTemporaryRedirect)
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}
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func (a *Application) forwardHandleNginx(rw http.ResponseWriter, r *http.Request) {
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claims, err := a.getClaims(r)
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if claims != nil && err == nil {
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a.addHeaders(rw.Header(), claims)
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rw.Header().Set("User-Agent", r.Header.Get("User-Agent"))
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rw.WriteHeader(200)
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a.log.WithField("headers", rw.Header()).Trace("headers written to forward_auth")
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return
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} else if claims == nil && a.IsAllowlisted(r) {
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a.log.Trace("path can be accessed without authentication")
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return
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}
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http.Error(rw, "unauthorized request", http.StatusUnauthorized)
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}
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