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authentik/internal/outpost/proxyv2/application/mode_proxy.go

90 lines
2.6 KiB
Go

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