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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package main
import (
"context"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/sha256"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"math/big"
"net"
"net/http"
"os"
"path/filepath"
"testing"
"time"
"tailscale.com/derp/derphttp"
"tailscale.com/derp/derpserver"
"tailscale.com/net/netmon"
"tailscale.com/tailcfg"
"tailscale.com/types/key"
)
// Verify that in --certmode=manual mode, we can use a bare IP address
// as the --hostname and that GetCertificate will return it.
func TestCertIP(t *testing.T) {
dir := t.TempDir()
const hostname = "1.2.3.4"
priv, err := ecdsa.GenerateKey(elliptic.P224(), rand.Reader)
if err != nil {
t.Fatal(err)
}
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
t.Fatal(err)
}
ip := net.ParseIP(hostname)
if ip == nil {
t.Fatalf("invalid IP address %q", hostname)
}
template := &x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"Tailscale Test Corp"},
},
NotBefore: time.Now(),
NotAfter: time.Now().Add(30 * 24 * time.Hour),
KeyUsage: x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
IPAddresses: []net.IP{ip},
}
derBytes, err := x509.CreateCertificate(rand.Reader, template, template, &priv.PublicKey, priv)
if err != nil {
t.Fatal(err)
}
certOut, err := os.Create(filepath.Join(dir, hostname+".crt"))
if err != nil {
t.Fatal(err)
}
if err := pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
t.Fatalf("Failed to write data to cert.pem: %v", err)
}
if err := certOut.Close(); err != nil {
t.Fatalf("Error closing cert.pem: %v", err)
}
keyOut, err := os.OpenFile(filepath.Join(dir, hostname+".key"), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
t.Fatal(err)
}
privBytes, err := x509.MarshalPKCS8PrivateKey(priv)
if err != nil {
t.Fatalf("Unable to marshal private key: %v", err)
}
if err := pem.Encode(keyOut, &pem.Block{Type: "PRIVATE KEY", Bytes: privBytes}); err != nil {
t.Fatalf("Failed to write data to key.pem: %v", err)
}
if err := keyOut.Close(); err != nil {
t.Fatalf("Error closing key.pem: %v", err)
}
cp, err := certProviderByCertMode("manual", dir, hostname)
if err != nil {
t.Fatal(err)
}
back, err := cp.TLSConfig().GetCertificate(&tls.ClientHelloInfo{
ServerName: "", // no SNI
})
if err != nil {
t.Fatalf("GetCertificate: %v", err)
}
if back == nil {
t.Fatalf("GetCertificate returned nil")
}
}
// Test that we can dial a raw IP without using a hostname and without a WebPKI
// cert, validating the cert against the signature of the cert in the DERP map's
// DERPNode.
//
// See https://github.com/tailscale/tailscale/issues/11776.
func TestPinnedCertRawIP(t *testing.T) {
td := t.TempDir()
cp, err := NewManualCertManager(td, "127.0.0.1")
if err != nil {
t.Fatalf("NewManualCertManager: %v", err)
}
cert, err := cp.TLSConfig().GetCertificate(&tls.ClientHelloInfo{
ServerName: "127.0.0.1",
})
if err != nil {
t.Fatalf("GetCertificate: %v", err)
}
ln, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatalf("Listen: %v", err)
}
defer ln.Close()
ds := derpserver.New(key.NewNode(), t.Logf)
derpHandler := derpserver.Handler(ds)
mux := http.NewServeMux()
mux.Handle("/derp", derpHandler)
var hs http.Server
hs.Handler = mux
hs.TLSConfig = cp.TLSConfig()
ds.ModifyTLSConfigToAddMetaCert(hs.TLSConfig)
go hs.ServeTLS(ln, "", "")
lnPort := ln.Addr().(*net.TCPAddr).Port
reg := &tailcfg.DERPRegion{
RegionID: 900,
Nodes: []*tailcfg.DERPNode{
{
RegionID: 900,
HostName: "127.0.0.1",
CertName: fmt.Sprintf("sha256-raw:%-02x", sha256.Sum256(cert.Leaf.Raw)),
DERPPort: lnPort,
},
},
}
netMon := netmon.NewStatic()
dc := derphttp.NewRegionClient(key.NewNode(), t.Logf, netMon, func() *tailcfg.DERPRegion {
return reg
})
defer dc.Close()
_, connClose, _, err := dc.DialRegionTLS(context.Background(), reg)
if err != nil {
t.Fatalf("DialRegionTLS: %v", err)
}
defer connClose.Close()
}
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