mirror of https://github.com/tailscale/tailscale/
net/tlsdial: bake in LetsEncrypt's ISRG Root X1 root
We still try the host's x509 roots first, but if that fails (like if the host is old), we fall back to using LetsEncrypt's root and retrying with that. tlsdial was used in the three main places: logs, control, DERP. But it was missing in dnsfallback. So added it there too, so we can run fine now on a machine with no DNS config and no root CAs configured. Also, move SSLKEYLOGFILE support out of DERP. tlsdial is the logical place for that support. Fixes #1609 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>pull/2978/head
Brad Fitzpatrick
3 years ago
committed by
Brad Fitzpatrick
parent
b10a55e4ed
commit
7cf8ec8108
@ -0,0 +1,131 @@
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// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package tlsdial
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import (
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"crypto/x509"
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"io"
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"net"
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"net/http"
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"os"
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"os/exec"
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"path/filepath"
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"reflect"
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"runtime"
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"sync/atomic"
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"testing"
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)
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func resetOnce() {
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rv := reflect.ValueOf(&bakedInRootsOnce).Elem()
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rv.Set(reflect.Zero(rv.Type()))
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}
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func TestBakedInRoots(t *testing.T) {
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resetOnce()
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p := bakedInRoots()
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got := p.Subjects()
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if len(got) != 1 {
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t.Errorf("subjects = %v; want 1", len(got))
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}
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}
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func TestFallbackRootWorks(t *testing.T) {
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defer resetOnce()
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const debug = false
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if runtime.GOOS != "linux" {
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t.Skip("test assumes Linux")
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}
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d := t.TempDir()
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crtFile := filepath.Join(d, "tlsdial.test.crt")
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keyFile := filepath.Join(d, "tlsdial.test.key")
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caFile := filepath.Join(d, "rootCA.pem")
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cmd := exec.Command(filepath.Join(runtime.GOROOT(), "bin", "go"),
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"run", "filippo.io/mkcert",
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"--cert-file="+crtFile,
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"--key-file="+keyFile,
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"tlsdial.test")
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cmd.Env = append(os.Environ(), "CAROOT="+d)
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out, err := cmd.CombinedOutput()
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if err != nil {
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t.Fatalf("mkcert: %v, %s", err, out)
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}
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if debug {
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t.Logf("Ran: %s", out)
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dents, err := os.ReadDir(d)
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if err != nil {
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t.Fatal(err)
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}
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for _, de := range dents {
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t.Logf(" - %v", de)
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}
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}
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caPEM, err := os.ReadFile(caFile)
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if err != nil {
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t.Fatal(err)
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}
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resetOnce()
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bakedInRootsOnce.Do(func() {
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p := x509.NewCertPool()
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if !p.AppendCertsFromPEM(caPEM) {
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t.Fatal("failed to add")
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}
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bakedInRootsOnce.p = p
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})
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ln, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Fatal(err)
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}
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defer ln.Close()
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if debug {
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t.Logf("listener running at %v", ln.Addr())
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}
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done := make(chan struct{})
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defer close(done)
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errc := make(chan error, 1)
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go func() {
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err := http.ServeTLS(ln, http.HandlerFunc(sayHi), crtFile, keyFile)
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select {
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case <-done:
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return
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default:
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t.Logf("ServeTLS: %v", err)
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errc <- err
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}
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}()
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tr := &http.Transport{
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Dial: func(network, addr string) (net.Conn, error) {
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return net.Dial("tcp", ln.Addr().String())
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},
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DisableKeepAlives: true, // for test cleanup ease
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}
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tr.TLSClientConfig = Config("tlsdial.test", tr.TLSClientConfig)
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c := &http.Client{Transport: tr}
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ctr0 := atomic.LoadInt32(&counterFallbackOK)
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res, err := c.Get("https://tlsdial.test/")
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if err != nil {
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t.Fatal(err)
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}
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defer res.Body.Close()
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if res.StatusCode != 200 {
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t.Fatal(res.Status)
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}
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ctrDelta := atomic.LoadInt32(&counterFallbackOK) - ctr0
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if ctrDelta != 1 {
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t.Errorf("fallback root success count = %d; want 1", ctrDelta)
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}
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}
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func sayHi(w http.ResponseWriter, r *http.Request) {
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io.WriteString(w, "hi")
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}
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