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//
// Copyright 2024 The Sigstore 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.
//go:build e2e
package test
import (
"crypto/x509"
"encoding/pem"
"log"
"os"
"testing"
)
func TestGenerateCertificateBundleFiles(t *testing.T) {
for _, tt := range []struct {
name string
genIntermediate bool
}{
{
name: "without intermediate",
genIntermediate: false,
},
{
name: "with intermediate",
genIntermediate: true,
},
} {
t.Run(tt.name, func(t *testing.T) {
td := t.TempDir()
suffix := "foo"
caCertFile, caPrivKeyFile, caIntermediateCertFile, caIntermediatePrivKeyFile,
certFile, certChainFile, err := generateCertificateBundleFiles(td, true, suffix)
if err != nil {
t.Fatalf("Error generating certificate bundle: %v", err)
}
verifyCertificate(t, caCertFile)
if tt.genIntermediate {
verifyCertificate(t, caIntermediateCertFile)
}
verifyCertificate(t, certFile)
verifyPrivateKey(t, caPrivKeyFile)
if tt.genIntermediate {
verifyPrivateKey(t, caIntermediatePrivKeyFile)
verifyCertificateChain(t, certChainFile)
}
})
}
}
func verifyCertificate(t *testing.T, certFile string) {
t.Helper()
// open and parse certFile, ensure it is a TLS certificate
data, err := os.ReadFile(certFile)
if err != nil {
t.Fatalf("Error reading certificate file %s: %v\n", certFile, err)
return
}
// Check if the file contents are a PEM-encoded TLS certificate
if !isPEMEncodedCert(data) {
t.Fatalf("file %s doesn't contain a valid PEM-encoded TLS certificate", certFile)
}
}
func verifyCertificateChain(t *testing.T, certChainFile string) {
t.Helper()
// open and parse certChainFile, ensure it is a TLS certificate chain
data, err := os.ReadFile(certChainFile)
if err != nil {
t.Fatalf("Error reading certificate file %s: %v\n", certChainFile, err)
}
// Check if the file contents are a PEM-encoded TLS certificate
if !isPEMEncodedCertChain(data) {
t.Fatalf("file %s doesn't contain a valid PEM-encoded TLS certificate chain", certChainFile)
}
}
// isPEMEncodedCert checks if the provided data is a PEM-encoded certificate
func isPEMEncodedCert(data []byte) bool {
// Decode the PEM data
block, _ := pem.Decode(data)
if block == nil || block.Type != "CERTIFICATE" {
return false
}
// Parse the certificate to ensure it is valid
_, err := x509.ParseCertificate(block.Bytes)
return err == nil
}
func verifyPrivateKey(t *testing.T, privKeyFile string) {
t.Helper()
// open and parse certFile, ensure it is a TLS certificate
data, err := os.ReadFile(privKeyFile)
if err != nil {
t.Fatalf("Error reading private key file %s: %v\n", privKeyFile, err)
return
}
// Check if the file contents are a PEM-encoded private key
if !isPEMEncodedPrivateKey(data) {
t.Fatalf("file %s doesn't contain a valid PEM-encoded private key", privKeyFile)
}
}
// isPEMEncodedPrivateKey checks if the provided data is a PEM-encoded private key
func isPEMEncodedPrivateKey(data []byte) bool {
// Decode the PEM data
block, _ := pem.Decode(data)
if block == nil {
return false
}
var err error
switch block.Type {
case "PRIVATE KEY":
_, err = x509.ParsePKCS8PrivateKey(block.Bytes)
case "RSA PRIVATE KEY":
_, err = x509.ParsePKCS1PrivateKey(block.Bytes)
case "EC PRIVATE KEY":
_, err = x509.ParseECPrivateKey(block.Bytes)
default:
return false
}
if err != nil {
log.Printf("isPEMEncodedPrivateKey: %v", err)
return false
}
return true
}
// isPEMEncodedCertChain checks if the provided data is a concatenation of a PEM-encoded
// intermediate certificate followed by a root certificate
func isPEMEncodedCertChain(data []byte) bool {
// Decode the PEM blocks one by one
blockCnt := 0
for len(data) > 0 {
var block *pem.Block
block, data = pem.Decode(data)
if block == nil {
break
}
if block.Type != "CERTIFICATE" {
return false
}
// Parse the certificate to ensure it is valid
_, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return false
}
blockCnt++
}
// we want exactly two blocks in the certificate chain - intermediate and root
return blockCnt == 2
}
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