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tailscale/ipn/ipnlocal/cert_test.go

203 lines
4.8 KiB
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
//go:build !ios && !android && !js
package ipnlocal
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"embed"
"encoding/pem"
"math/big"
"testing"
"time"
"github.com/google/go-cmp/cmp"
"golang.org/x/exp/maps"
"tailscale.com/ipn/store/mem"
)
func TestValidLookingCertDomain(t *testing.T) {
tests := []struct {
in string
want bool
}{
{"foo.com", true},
{"foo..com", false},
{"foo/com.com", false},
{"NUL", false},
{"", false},
{"foo\\bar.com", false},
{"foo\x00bar.com", false},
}
for _, tt := range tests {
if got := validLookingCertDomain(tt.in); got != tt.want {
t.Errorf("validLookingCertDomain(%q) = %v, want %v", tt.in, got, tt.want)
}
}
}
//go:embed testdata/*
var certTestFS embed.FS
func TestCertStoreRoundTrip(t *testing.T) {
const testDomain = "example.com"
// Use a fixed verification timestamp so validity doesn't fall off when the
// cert expires. If you update the test data below, this may also need to be
// updated.
testNow := time.Date(2023, time.February, 10, 0, 0, 0, 0, time.UTC)
// To re-generate a root certificate and domain certificate for testing,
// use:
//
// go run filippo.io/mkcert@latest example.com
//
// The content is not important except to be structurally valid so we can be
// sure the round-trip succeeds.
testRoot, err := certTestFS.ReadFile("testdata/rootCA.pem")
if err != nil {
t.Fatal(err)
}
roots := x509.NewCertPool()
if !roots.AppendCertsFromPEM(testRoot) {
t.Fatal("Unable to add test CA to the cert pool")
}
testCert, err := certTestFS.ReadFile("testdata/example.com.pem")
if err != nil {
t.Fatal(err)
}
testKey, err := certTestFS.ReadFile("testdata/example.com-key.pem")
if err != nil {
t.Fatal(err)
}
tests := []struct {
name string
store certStore
}{
{"FileStore", certFileStore{dir: t.TempDir(), testRoots: roots}},
{"StateStore", certStateStore{StateStore: new(mem.Store), testRoots: roots}},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
if err := test.store.WriteCert(testDomain, testCert); err != nil {
t.Fatalf("WriteCert: unexpected error: %v", err)
}
if err := test.store.WriteKey(testDomain, testKey); err != nil {
t.Fatalf("WriteKey: unexpected error: %v", err)
}
kp, err := test.store.Read(testDomain, testNow)
if err != nil {
t.Fatalf("Read: unexpected error: %v", err)
}
if diff := cmp.Diff(kp.CertPEM, testCert); diff != "" {
t.Errorf("Certificate (-got, +want):\n%s", diff)
}
if diff := cmp.Diff(kp.KeyPEM, testKey); diff != "" {
t.Errorf("Key (-got, +want):\n%s", diff)
}
})
}
}
func TestShouldStartDomainRenewal(t *testing.T) {
reset := func() {
renewMu.Lock()
defer renewMu.Unlock()
maps.Clear(renewCertAt)
}
mustMakePair := func(template *x509.Certificate) *TLSCertKeyPair {
priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
panic(err)
}
b, err := x509.CreateCertificate(rand.Reader, template, template, &priv.PublicKey, priv)
if err != nil {
panic(err)
}
certPEM := pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: b,
})
return &TLSCertKeyPair{
Cached: false,
CertPEM: certPEM,
KeyPEM: []byte("unused"),
}
}
now := time.Unix(1685714838, 0)
subject := pkix.Name{
Organization: []string{"Tailscale, Inc."},
Country: []string{"CA"},
Province: []string{"ON"},
Locality: []string{"Toronto"},
StreetAddress: []string{"290 Bremner Blvd"},
PostalCode: []string{"M5V 3L9"},
}
testCases := []struct {
name string
notBefore time.Time
lifetime time.Duration
want bool
wantErr string
}{
{
name: "should renew",
notBefore: now.AddDate(0, 0, -89),
lifetime: 90 * 24 * time.Hour,
want: true,
},
{
name: "short-lived renewal",
notBefore: now.AddDate(0, 0, -7),
lifetime: 10 * 24 * time.Hour,
want: true,
},
{
name: "no renew",
notBefore: now.AddDate(0, 0, -59), // 59 days ago == not 2/3rds of the way through 90 days yet
lifetime: 90 * 24 * time.Hour,
want: false,
},
}
b := new(LocalBackend)
for _, tt := range testCases {
t.Run(tt.name, func(t *testing.T) {
reset()
ret, err := b.domainRenewalTimeByExpiry(mustMakePair(&x509.Certificate{
SerialNumber: big.NewInt(2019),
Subject: subject,
NotBefore: tt.notBefore,
NotAfter: tt.notBefore.Add(tt.lifetime),
}))
if tt.wantErr != "" {
if err == nil {
t.Errorf("wanted error, got nil")
} else if err.Error() != tt.wantErr {
t.Errorf("got err=%q, want %q", err.Error(), tt.wantErr)
}
} else {
renew := now.After(ret)
if renew != tt.want {
t.Errorf("got renew=%v (ret=%v), want renew %v", renew, ret, tt.want)
}
}
})
}
}