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validator.go
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validator.go
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package certs
import (
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"os"
"github.com/cloudfoundry/multierror"
)
type CertData struct {
Cert []byte
Key []byte
Chain []byte
}
type Validator struct{}
func NewValidator() Validator {
return Validator{}
}
func (v Validator) ReadAndValidate(certPath, keyPath, chainPath string) (CertData, error) {
certData, readErrors := v.Read(certPath, keyPath, chainPath)
if readErrors != nil {
return CertData{}, readErrors
}
validateErrors := v.Validate(certData.Cert, certData.Key, certData.Chain)
if validateErrors != nil {
return CertData{}, validateErrors
}
return certData, nil
}
func (v Validator) Read(certPath, keyPath, chainPath string) (CertData, error) {
var err error
var certBytes []byte
var keyBytes []byte
var chainBytes []byte
validateErrors := multierror.NewMultiError("")
if certBytes, err = readFile("certificate", "--cert", certPath); err != nil {
validateErrors.Add(err)
}
if keyBytes, err = readFile("key", "--key", keyPath); err != nil {
validateErrors.Add(err)
}
if chainPath != "" {
if chainBytes, err = readFile("chain", "--chain", chainPath); err != nil {
validateErrors.Add(err)
}
}
if validateErrors.Length() > 0 {
return CertData{}, validateErrors
}
return CertData{
Cert: certBytes,
Key: keyBytes,
Chain: chainBytes,
}, nil
}
func (v Validator) Validate(cert, key, chain []byte) error {
var err error
var certificate *x509.Certificate
var privateKey *rsa.PrivateKey
validateErrors := multierror.NewMultiError("")
err = validatePEM(cert)
if err != nil {
validateErrors.Add(fmt.Errorf("certificate %s: \"%s\"", err, cert))
}
err = validatePEM(key)
if err != nil {
validateErrors.Add(fmt.Errorf("key %s: \"%s\"", err, key))
}
if len(chain) > 0 {
err = validatePEM(chain)
if err != nil {
validateErrors.Add(fmt.Errorf("chain %s: \"%s\"", err, chain))
}
}
if validateErrors.Length() > 0 {
return validateErrors
}
tlsCertificateStruct, err := tls.X509KeyPair(cert, key)
if err != nil {
validateErrors.Add(err)
} else {
privateKey = tlsCertificateStruct.PrivateKey.(*rsa.PrivateKey)
}
if certificate == nil {
loadKeyPairError := err
certificate, err = parseCertificate(cert, loadKeyPairError)
if err != nil {
validateErrors.Add(err)
}
}
var certPool *x509.CertPool
if len(chain) > 0 {
certPool, err = parseChain(chain)
if err != nil {
validateErrors.Add(err)
}
}
if privateKey != nil && certificate != nil {
if err := validateCertAndKey(certificate, privateKey); err != nil {
validateErrors.Add(err)
}
}
if certPool != nil && certificate != nil {
if err := validateCertAndChain(certificate, certPool); err != nil {
validateErrors.Add(err)
}
}
if validateErrors.Length() > 0 {
return validateErrors
}
return nil
}
func validatePEM(data []byte) error {
p, _ := pem.Decode(data)
if p == nil {
return errors.New("is not PEM encoded")
}
return nil
}
func readFile(propertyName string, flagName string, filePath string) ([]byte, error) {
if filePath == "" {
return []byte{}, fmt.Errorf("%s is required", flagName)
}
file, err := os.Open(filePath)
if os.IsNotExist(err) {
return []byte{}, fmt.Errorf(`%s file not found: %q`, propertyName, filePath)
} else if err != nil {
return []byte{}, err
}
fileInfo, err := os.Stat(file.Name())
if err != nil {
return []byte{}, fmt.Errorf("%s: %s", err, filePath)
}
if !fileInfo.Mode().IsRegular() {
return []byte{}, fmt.Errorf(`%s is not a regular file: %q`, propertyName, filePath)
}
fileData, err := ioutil.ReadAll(file)
if err != nil {
return []byte{}, fmt.Errorf("%s: %s", err, filePath)
}
return fileData, nil
}
func validateCertAndKey(certificate *x509.Certificate, privateKey *rsa.PrivateKey) error {
publicKey := certificate.PublicKey.(*rsa.PublicKey)
if privateKey.PublicKey.N.Cmp(publicKey.N) != 0 || privateKey.PublicKey.E != publicKey.E {
return errors.New("certificate and key mismatch")
}
return nil
}
func validateCertAndChain(certificate *x509.Certificate, certPool *x509.CertPool) error {
opts := x509.VerifyOptions{
Roots: certPool,
}
if _, err := certificate.Verify(opts); err != nil {
return fmt.Errorf("certificate and chain mismatch: %s", err.Error())
}
return nil
}
func parseCertificate(certificateData []byte, loadKeyPairError error) (*x509.Certificate, error) {
pemCertData, _ := pem.Decode(certificateData)
cert, err := x509.ParseCertificate(pemCertData.Bytes)
if err != nil && err != loadKeyPairError {
return nil, fmt.Errorf("failed to parse certificate: %s", err)
}
return cert, nil
}
func parseChain(chainData []byte) (*x509.CertPool, error) {
roots := x509.NewCertPool()
ok := roots.AppendCertsFromPEM(chainData)
if !ok {
return nil, fmt.Errorf("failed to parse chain")
}
return roots, nil
}