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utils.go
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utils.go
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/*
Copyright 2023 The Dapr Authors
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 jwks
import (
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/json"
"encoding/pem"
"fmt"
"log"
"math/big"
"testing"
"time"
"github.com/lestrrat-go/jwx/v2/jwa"
"github.com/lestrrat-go/jwx/v2/jwk"
"github.com/lestrrat-go/jwx/v2/jwt"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
sentrypbv1 "github.com/dapr/dapr/pkg/proto/sentry/v1"
"github.com/dapr/dapr/pkg/sentry/server/ca"
)
const (
// Trust domain for Sentry
sentryTrustDomain = "localhost"
// Namespace for sentry
sentryNamespace = "default"
)
// Keys used to sign and verify JWTs
var (
jwtSigningKeyPriv jwk.Key
jwtSigningKeyPubJSON []byte
)
func init() {
// Generate a signing key
privK, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
log.Fatalf("failed to generate private key: %v", err)
}
jwtSigningKeyPriv, err = jwk.FromRaw(privK)
if err != nil {
log.Fatalf("failed to import private key as JWK: %v", err)
}
jwtSigningKeyPriv.Set("kid", "mykey")
jwtSigningKeyPriv.Set("alg", "ES256")
jwtSigningKeyPub, err := jwtSigningKeyPriv.PublicKey()
if err != nil {
log.Fatalf("failed to get public key from JWK: %v", err)
}
jwtSigningKeyPubJSON, err = json.Marshal(jwtSigningKeyPub)
if err != nil {
log.Fatalf("failed to marshal public key from JWK: %v", err)
}
}
// Generate a CSR given a private key.
func generateCSR(id string, privKey crypto.PrivateKey) ([]byte, error) {
csr := x509.CertificateRequest{
Subject: pkix.Name{CommonName: id},
DNSNames: []string{id},
}
csrDer, err := x509.CreateCertificateRequest(rand.Reader, &csr, privKey)
if err != nil {
return nil, fmt.Errorf("failed to create sidecar csr: %w", err)
}
csrPem := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE REQUEST", Bytes: csrDer})
return csrPem, nil
}
func generateJWT(sub string) *jwt.Builder {
now := time.Now()
return jwt.NewBuilder().
Audience([]string{fmt.Sprintf("spiffe://%s/ns/%s/dapr-sentry", sentryTrustDomain, sentryNamespace)}).
Expiration(now.Add(time.Hour)).
IssuedAt(now).
Subject(sub)
}
func signJWT(builder *jwt.Builder) ([]byte, error) {
token, err := builder.Build()
if err != nil {
return nil, err
}
return jwt.Sign(token, jwt.WithKey(jwa.ES256, jwtSigningKeyPriv))
}
func validateCertificateResponse(t *testing.T, res *sentrypbv1.SignCertificateResponse, sentryBundle ca.Bundle, expectSPIFFEID, expectDNSName string) {
t.Helper()
require.NotEmpty(t, res.GetWorkloadCertificate())
rest := res.GetWorkloadCertificate()
// First block should contain the issued workload certificate
{
var block *pem.Block
block, rest = pem.Decode(rest)
require.NotEmpty(t, block)
require.Equal(t, "CERTIFICATE", block.Type)
cert, err := x509.ParseCertificate(block.Bytes)
require.NoError(t, err)
certURIs := make([]string, len(cert.URIs))
for i, v := range cert.URIs {
certURIs[i] = v.String()
}
assert.Equal(t, []string{expectSPIFFEID}, certURIs)
assert.Equal(t, []string{expectDNSName}, cert.DNSNames)
assert.Contains(t, cert.ExtKeyUsage, x509.ExtKeyUsageServerAuth)
assert.Contains(t, cert.ExtKeyUsage, x509.ExtKeyUsageClientAuth)
}
// Second block should contain the Sentry CA certificate
{
var block *pem.Block
block, rest = pem.Decode(rest)
require.Empty(t, rest)
require.NotEmpty(t, block)
require.Equal(t, "CERTIFICATE", block.Type)
cert, err := x509.ParseCertificate(block.Bytes)
require.NoError(t, err)
assert.Equal(t, []string{"cluster.local"}, cert.DNSNames)
}
}
func generateCACertificate(t *testing.T) (caCert []byte, caKey []byte) {
// Generate a private key for the CA
caPrivateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
require.NoError(t, err)
// Create a self-signed CA certificate
caTemplate := &x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{CommonName: "CA"},
NotBefore: time.Now().Add(-1 * time.Hour),
NotAfter: time.Now().Add(24 * time.Hour),
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
IsCA: true,
}
caCertificateDER, err := x509.CreateCertificate(rand.Reader, caTemplate, caTemplate, caPrivateKey.Public(), caPrivateKey)
require.NoError(t, err)
caCert = pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: caCertificateDER})
caPrivateKeyDER, err := x509.MarshalPKCS8PrivateKey(caPrivateKey)
require.NoError(t, err)
caKey = pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: caPrivateKeyDER})
return caCert, caKey
}
func generateTLSCertificates(t *testing.T, caCert []byte, caKey []byte, dnsName string) (cert []byte, key []byte) {
// Load the CA certificate and key
caCertBlock, _ := pem.Decode(caCert)
caCertificate, err := x509.ParseCertificate(caCertBlock.Bytes)
require.NoError(t, err)
caKeyBlock, _ := pem.Decode(caKey)
caPrivateKey, err := x509.ParsePKCS8PrivateKey(caKeyBlock.Bytes)
require.NoError(t, err)
// Generate a private key for the new cert
privKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
require.NoError(t, err)
// Create a certificate
certData := &x509.Certificate{
SerialNumber: big.NewInt(10),
Subject: pkix.Name{Organization: []string{"localhost"}},
NotBefore: time.Now().Add(-1 * time.Hour),
NotAfter: time.Now().Add(24 * time.Hour),
DNSNames: []string{dnsName},
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature,
}
certDER, err := x509.CreateCertificate(rand.Reader, certData, caCertificate, privKey.Public(), caPrivateKey)
require.NoError(t, err)
cert = pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certDER})
require.NoError(t, err)
keyDER, err := x509.MarshalPKCS8PrivateKey(privKey)
require.NoError(t, err)
key = pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: keyDER})
return cert, key
}