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// Copyright 2016 Google LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tesseract
import (
"context"
"crypto/sha256"
"crypto/x509"
"encoding/csv"
"encoding/hex"
"encoding/pem"
"maps"
"net/http"
"net/http/httptest"
"slices"
"strings"
"sync"
"testing"
"time"
"github.com/transparency-dev/tesseract/internal/ccadb"
"github.com/transparency-dev/tesseract/internal/testdata"
"github.com/transparency-dev/tesseract/storage"
)
func TestNewCertValidationOpts(t *testing.T) {
t100 := time.Unix(100, 0)
t200 := time.Unix(200, 0)
for _, tc := range []struct {
desc string
wantErr string
cvCfg ChainValidationConfig
}{
{
desc: "empty-rootsPemFile",
wantErr: "empty rootsPemFile",
},
{
desc: "missing-root-cert",
wantErr: "failed to read trusted roots",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/bogus.cert",
},
},
{
desc: "rejecting-all",
wantErr: "configuration would reject all certificates",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
RejectExpired: true,
RejectUnexpired: true},
},
{
desc: "unknown-ext-key-usage-1",
wantErr: "unknown extended key usage",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
ExtKeyUsages: "wrong_usage"},
},
{
desc: "unknown-ext-key-usage-2",
wantErr: "unknown extended key usage",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
ExtKeyUsages: "ClientAuth,ServerAuth,TimeStomping",
},
},
{
desc: "unknown-ext-key-usage-3",
wantErr: "unknown extended key usage",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
ExtKeyUsages: "Any ",
},
},
{
desc: "unknown-reject-ext",
wantErr: "failed to parse RejectExtensions",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
RejectExtensions: "1.2.3.4,one.banana.two.bananas",
},
},
{
desc: "limit-before-start",
wantErr: "before start",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
NotAfterStart: &t200,
NotAfterLimit: &t100,
},
},
{
desc: "ok",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
},
},
{
desc: "ok-ext-key-usages",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
ExtKeyUsages: "ServerAuth,ClientAuth,OCSPSigning",
},
},
{
desc: "ok-reject-ext",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
RejectExtensions: "1.2.3.4,5.6.7.8",
},
},
{
desc: "ok-start-timestamp",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
NotAfterStart: &t100,
},
},
{
desc: "ok-limit-timestamp",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
NotAfterStart: &t200,
},
},
{
desc: "ok-range-timestamp",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
NotAfterStart: &t100,
NotAfterLimit: &t200,
},
},
{
desc: "invalid-reject-roots",
wantErr: "failed to create roots pool",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
RejectRoots: []string{"invalid-hex"},
},
},
{
desc: "invalid-reject-intermediates",
wantErr: "failed to validate rejected intermediates",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
RejectIntermediates: []string{"invalid-hex"},
},
},
} {
t.Run(tc.desc, func(t *testing.T) {
vc, err := newChainValidator(t.Context(), tc.cvCfg)
if len(tc.wantErr) == 0 && err != nil {
t.Errorf("ValidateLogConfig()=%v, want nil", err)
}
if len(tc.wantErr) > 0 && (err == nil || !strings.Contains(err.Error(), tc.wantErr)) {
t.Errorf("ValidateLogConfig()=%v, want err containing %q", err, tc.wantErr)
}
if err == nil && vc == nil {
t.Error("err and ValidatedLogConfig are both nil")
}
})
}
}
type ccadbRsp struct {
code int
crts []string
}
func newCCADBTestServer(t *testing.T, rsps []ccadbRsp) *httptest.Server {
t.Helper()
if len(rsps) == 0 {
rsps = append(rsps, ccadbRsp{code: 404})
}
i := 0
next := func() ccadbRsp {
idx := min(i, len(rsps)-1)
i++
return rsps[idx]
}
return httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
rsp := next()
w.WriteHeader(rsp.code)
if rsp.code != 200 {
return
}
cw := csv.NewWriter(w)
records := [][]string{
{ccadb.ColIssuer, ccadb.ColSHA, ccadb.ColSubject, ccadb.ColPEM, ccadb.ColUseCase},
}
for _, c := range rsp.crts {
cert := parsePEM(t, c)
records = append(records, []string{cert.Issuer.String(), "dum", cert.Subject.String(), c, ccadb.UseCaseServerAuth})
}
for _, record := range records {
if err := cw.Write(record); err != nil {
t.Fatalf("error writing record to csv: %v", err)
}
}
cw.Flush()
}))
}
func TestNewChainValidatorRootsRemoteFetch(t *testing.T) {
fetchInterval := 20 * time.Millisecond
for _, tc := range []struct {
desc string
cvCfg ChainValidationConfig
rsps []ccadbRsp
rsps2 []ccadbRsp
wantNRoots int
}{
{
desc: "ok-no-remote",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
},
wantNRoots: 1,
},
{
desc: "404",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
RootsRemoteFetchInterval: fetchInterval,
},
rsps: []ccadbRsp{
{
code: 404,
},
},
wantNRoots: 1,
},
{
desc: "404-then-200-new-root",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
RootsRemoteFetchInterval: fetchInterval,
},
rsps: []ccadbRsp{
{
code: 404,
},
{
code: 404,
},
{
code: 200,
crts: []string{
testdata.CACertPEM,
},
},
},
wantNRoots: 2,
},
{
desc: "new-root-on-start",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
RootsRemoteFetchInterval: fetchInterval,
},
rsps: []ccadbRsp{
{
code: 200,
crts: []string{
testdata.CACertPEM,
},
},
},
wantNRoots: 2,
},
{
desc: "no-new-root",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
RootsRemoteFetchInterval: fetchInterval,
},
rsps: []ccadbRsp{
{
code: 200,
crts: []string{
testdata.FakeRootCACertPEM,
},
},
},
wantNRoots: 1,
},
{
desc: "root-removed",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
RootsRemoteFetchInterval: fetchInterval,
},
rsps: []ccadbRsp{
{
code: 200,
crts: []string{
testdata.CACertPEM,
testdata.FakeRootCACertPEM,
},
},
{
code: 200,
crts: []string{
testdata.FakeRootCACertPEM,
},
},
},
wantNRoots: 2,
},
{
desc: "two-remote-endpoints",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
RootsRemoteFetchInterval: fetchInterval,
},
rsps: []ccadbRsp{
{
code: 200,
crts: []string{
testdata.CACertPEM,
},
},
},
rsps2: []ccadbRsp{
{
code: 200,
crts: []string{
testdata.CACertPEM, // Same root, shouldn't duplicate
testdata.FakeCACertPEM, // New root.
},
},
},
wantNRoots: 3, // one from file, one from server 1, one from server 2
},
} {
t.Run(tc.desc, func(t *testing.T) {
ts := newCCADBTestServer(t, tc.rsps)
ts.Start()
defer ts.Close()
urls := []string{ts.URL}
if len(tc.rsps2) > 0 {
ts2 := newCCADBTestServer(t, tc.rsps2)
ts2.Start()
defer ts2.Close()
urls = append(urls, ts2.URL)
}
tc.cvCfg.RootsRemoteFetchURLs = urls
cv, err := newChainValidator(t.Context(), tc.cvCfg)
if err == nil && cv == nil {
t.Error("err and ValidatedLogConfig are both nil")
}
time.Sleep(10 * fetchInterval)
if got := len(cv.Roots()); got != tc.wantNRoots {
t.Errorf("ChainValidator has %d roots, want %d", got, tc.wantNRoots)
}
})
}
}
func parsePEM(t *testing.T, pemCert string) *x509.Certificate {
var block *pem.Block
block, _ = pem.Decode([]byte(pemCert))
if block == nil || block.Type != "CERTIFICATE" || len(block.Headers) != 0 {
t.Fatal("No PEM data found")
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
t.Fatalf("Failed to parse PEM certificate: %v", err)
}
return cert
}
type memoryRootsStorage struct {
mu sync.RWMutex
m map[string][]byte
}
func (m *memoryRootsStorage) AddIfNotExist(ctx context.Context, kvs []storage.KV) error {
m.mu.Lock()
defer m.mu.Unlock()
for _, kv := range kvs {
m.m[string(kv.K)] = kv.V
}
return nil
}
func (m *memoryRootsStorage) LoadAll(ctx context.Context) ([]storage.KV, error) {
m.mu.RLock()
defer m.mu.RUnlock()
kvs := make([]storage.KV, 0, len(m.m))
for k, v := range m.m {
kvs = append(kvs, storage.KV{K: []byte(k), V: v})
}
return kvs, nil
}
func TestNewChainValidatorRootsFiltering(t *testing.T) {
fetchInterval := 20 * time.Millisecond
fakeRoot := parsePEM(t, testdata.FakeRootCACertPEM)
fakeRootDER := fakeRoot.Raw
fakeRootSHA256 := sha256.Sum256(fakeRootDER)
fakeRootFingerprint := hex.EncodeToString(fakeRootSHA256[:])
caRoot := parsePEM(t, testdata.CACertPEM)
caRootDER := caRoot.Raw
caRootSHA256 := sha256.Sum256(caRootDER)
caRootFingerprint := hex.EncodeToString(caRootSHA256[:])
for _, tc := range []struct {
desc string
cvCfg ChainValidationConfig
rsps []ccadbRsp
backupRoots []storage.KV
wantNRoots int
wantRootsFP []string // Fingerprints we expect to be present
wantBackupRootsFP []string // Fingerprints we expect to be present
}{
{
desc: "reject-local-root",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert", // Contains FakeRootCACertPEM
RejectRoots: []string{fakeRootFingerprint},
},
wantNRoots: 0,
wantRootsFP: nil,
wantBackupRootsFP: nil,
},
{
desc: "reject-remote-root",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
RootsRemoteFetchInterval: fetchInterval,
RejectRoots: []string{caRootFingerprint}, // Reject the remote one, accept local
},
rsps: []ccadbRsp{
{
code: 200,
crts: []string{
testdata.CACertPEM, // This is the remote one
},
},
},
wantNRoots: 1, // Only local FakeRootCACertPEM
wantRootsFP: []string{fakeRootFingerprint},
wantBackupRootsFP: []string{caRootFingerprint}, // remote roots are always backed up
},
{
desc: "reject-both-roots",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/fake-ca.cert",
RootsRemoteFetchInterval: fetchInterval,
RejectRoots: []string{fakeRootFingerprint, caRootFingerprint},
},
rsps: []ccadbRsp{
{
code: 200,
crts: []string{
testdata.CACertPEM,
},
},
},
wantNRoots: 0,
wantRootsFP: []string{},
wantBackupRootsFP: []string{caRootFingerprint}, // remote roots are always backed up
},
{
desc: "reject-backup-root",
cvCfg: ChainValidationConfig{
RootsPEMFile: "./internal/testdata/test_root_ca_cert.pem", // Just to satisfy non-empty check
RootsRemoteFetchInterval: fetchInterval,
RejectRoots: []string{fakeRootFingerprint},
},
backupRoots: []storage.KV{
{
K: []byte(fakeRootFingerprint),
V: []byte(testdata.FakeRootCACertPEM),
},
},
wantNRoots: 1, // Only CACertPEM from file
wantRootsFP: []string{caRootFingerprint}, // CACertPEM fingerprint
wantBackupRootsFP: []string{fakeRootFingerprint}, // remote roots are always backed up
},
} {
t.Run(tc.desc, func(t *testing.T) {
ts := newCCADBTestServer(t, tc.rsps)
ts.Start()
defer ts.Close()
tc.cvCfg.RootsRemoteFetchURLs = []string{ts.URL}
tc.cvCfg.RootsRemoteFetchBackup = &memoryRootsStorage{m: make(map[string][]byte)}
if err := tc.cvCfg.RootsRemoteFetchBackup.AddIfNotExist(t.Context(), tc.backupRoots); err != nil {
t.Fatalf("Can't initialize root backup storage: %v", err)
}
cv, err := newChainValidator(t.Context(), tc.cvCfg)
if err != nil {
t.Fatalf("newChainValidator()=%v", err)
}
time.Sleep(10 * fetchInterval)
roots := cv.Roots()
if got := len(roots); got != tc.wantNRoots {
t.Errorf("ChainValidator has %d roots, want %d", got, tc.wantNRoots)
}
// Verify presence of expected roots
for _, wantFP := range tc.wantRootsFP {
found := false
for _, r := range roots {
sha := sha256.Sum256(r.Raw)
if hex.EncodeToString(sha[:]) == wantFP {
found = true
break
}
}
if !found {
t.Errorf("ChainValidator missing root with fingerprint %s", wantFP)
}
}
// Verify presence of expected backed up roots
gotBackupRoots, err := tc.cvCfg.RootsRemoteFetchBackup.LoadAll(t.Context())
if err != nil {
t.Fatalf("Couldn't read backed up roots: %v", err)
}
gotBackupRootsByFP := make(map[string][]byte)
for _, root := range gotBackupRoots {
gotBackupRootsByFP[string(root.K)] = root.V
}
for _, wantFP := range tc.wantBackupRootsFP {
if _, exists := gotBackupRootsByFP[wantFP]; !exists {
t.Errorf("Backed up roots missing root with fingerprint %s", wantFP)
continue
}
delete(gotBackupRootsByFP, wantFP)
}
if len(gotBackupRootsByFP) > 0 {
extra := slices.Collect(maps.Keys(gotBackupRootsByFP))
t.Errorf("Backed up roots contains unexpected roots: %v", strings.Join(extra, ", "))
}
})
}
}