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certificate_validator.go
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certificate_validator.go
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package iam
import (
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"github.com/cloudfoundry/multierror"
)
var readAll func(r io.Reader) ([]byte, error) = ioutil.ReadAll
var stat func(name string) (os.FileInfo, error) = os.Stat
type CertificateValidator struct{}
func NewCertificateValidator() CertificateValidator {
return CertificateValidator{}
}
func (c CertificateValidator) Validate(command, certPath, keyPath, chainPath string) error {
var err error
var certificateData []byte
var keyData []byte
var chainData []byte
validateErrors := multierror.NewMultiError(command)
if certificateData, err = c.validateFileAndFormat("certificate", "--cert", certPath); err != nil {
validateErrors.Add(err)
}
if keyData, err = c.validateFileAndFormat("key", "--key", keyPath); err != nil {
validateErrors.Add(err)
}
if chainPath != "" {
if chainData, err = c.validateFileAndFormat("chain", "--chain", chainPath); err != nil {
validateErrors.Add(err)
}
}
if validateErrors.Length() > 0 {
return validateErrors
}
privateKey, err := c.parsePrivateKey(keyData)
if err != nil {
validateErrors.Add(err)
}
certificate, err := c.parseCertificate(certificateData)
if err != nil {
validateErrors.Add(err)
}
var certPool *x509.CertPool
if chainPath != "" {
certPool, err = c.parseChain(chainData)
if err != nil {
validateErrors.Add(err)
}
}
if privateKey != nil && certificate != nil {
if err := c.validateCertAndKey(certificate, privateKey); err != nil {
validateErrors.Add(err)
}
}
if certPool != nil && certificate != nil {
if err := c.validateCertAndChain(certificate, certPool); err != nil {
validateErrors.Add(err)
}
}
if validateErrors.Length() > 0 {
return validateErrors
}
return nil
}
func (CertificateValidator) validateFileAndFormat(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 := 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 := readAll(file)
if err != nil {
return []byte{}, fmt.Errorf("%s: %s", err, filePath)
}
p, _ := pem.Decode(fileData)
if p == nil {
return []byte{}, fmt.Errorf("%s is not PEM encoded: %q", propertyName, filePath)
}
return fileData, nil
}
func (c CertificateValidator) 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 (CertificateValidator) 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 (CertificateValidator) parsePrivateKey(keyData []byte) (*rsa.PrivateKey, error) {
pemKeyData, _ := pem.Decode(keyData)
privateKey, err := x509.ParsePKCS1PrivateKey(pemKeyData.Bytes)
if err != nil {
return nil, fmt.Errorf("failed to parse private key: %s", err)
}
return privateKey, nil
}
func (CertificateValidator) parseCertificate(certificateData []byte) (*x509.Certificate, error) {
pemCertData, _ := pem.Decode(certificateData)
cert, err := x509.ParseCertificate(pemCertData.Bytes)
if err != nil {
return nil, fmt.Errorf("failed to parse certificate: %s", err)
}
return cert, nil
}
func (CertificateValidator) 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
}