mirror of
https://github.com/tailscale/tailscale.git
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81 lines
2.1 KiB
Go
81 lines
2.1 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package main
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import (
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"context"
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"crypto/tls"
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"fmt"
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"log"
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"net"
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"net/http"
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"net/http/httputil"
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"net/url"
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"os"
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"strings"
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"tailscale.com/client/tailscale"
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"tailscale.com/client/tailscale/apitype"
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"tailscale.com/types/logger"
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)
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type whoIsKey struct{}
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// authProxy is an http.Handler that authenticates requests using the Tailscale
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// LocalAPI and then proxies them to the Kubernetes API.
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type authProxy struct {
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logf logger.Logf
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lc *tailscale.LocalClient
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rp *httputil.ReverseProxy
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}
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func (h *authProxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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who, err := h.lc.WhoIs(r.Context(), r.RemoteAddr)
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if err != nil {
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h.logf("failed to authenticate caller: %v", err)
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http.Error(w, "failed to authenticate caller", http.StatusInternalServerError)
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return
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}
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r = r.WithContext(context.WithValue(r.Context(), whoIsKey{}, who))
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h.rp.ServeHTTP(w, r)
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}
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func runAuthProxy(lc *tailscale.LocalClient, ls net.Listener, rt http.RoundTripper, logf logger.Logf) {
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u, err := url.Parse(fmt.Sprintf("https://%s:%s", os.Getenv("KUBERNETES_SERVICE_HOST"), os.Getenv("KUBERNETES_SERVICE_PORT_HTTPS")))
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if err != nil {
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log.Fatalf("runAuthProxy: failed to parse URL %v", err)
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}
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ap := &authProxy{
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logf: logf,
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lc: lc,
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rp: &httputil.ReverseProxy{
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Director: func(r *http.Request) {
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// Replace the request with the user's identity.
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who := r.Context().Value(whoIsKey{}).(*apitype.WhoIsResponse)
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r.Header.Set("Impersonate-User", who.UserProfile.LoginName)
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// Remove all authentication headers.
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r.Header.Del("Authorization")
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r.Header.Del("Impersonate-Group")
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r.Header.Del("Impersonate-Uid")
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for k := range r.Header {
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if strings.HasPrefix(k, "Impersonate-Extra-") {
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r.Header.Del(k)
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}
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}
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// Replace the URL with the Kubernetes APIServer.
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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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Transport: rt,
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},
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}
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if err := http.Serve(tls.NewListener(ls, &tls.Config{
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GetCertificate: lc.GetCertificate,
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}), ap); err != nil {
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log.Fatalf("runAuthProxy: failed to serve %v", err)
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}
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}
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