/
certificates.go
executable file
·148 lines (120 loc) · 4.86 KB
/
certificates.go
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package certificates
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"math/big"
"time"
"github.com/kyma-incubator/compass/components/connector/internal/apperrors"
)
//go:generate mockery --name=CertificateUtility --disable-version-string
type CertificateUtility interface {
LoadCert(encodedData []byte) (*x509.Certificate, apperrors.AppError)
LoadKey(encodedData []byte) (*rsa.PrivateKey, apperrors.AppError)
LoadCSR(encodedData []byte) (*x509.CertificateRequest, apperrors.AppError)
CheckCSRValues(csr *x509.CertificateRequest, subject CSRSubject) apperrors.AppError
SignCSR(caCrt *x509.Certificate, csr *x509.CertificateRequest, caKey *rsa.PrivateKey) ([]byte, apperrors.AppError)
AddCertificateHeaderAndFooter(crtRaw []byte) []byte
}
type certificateUtility struct {
certificateValidityTime time.Duration
}
func NewCertificateUtility(certificateValidityTime time.Duration) CertificateUtility {
return &certificateUtility{
certificateValidityTime: certificateValidityTime,
}
}
func (cu *certificateUtility) LoadCert(encodedData []byte) (*x509.Certificate, apperrors.AppError) {
pemBlock, _ := pem.Decode(encodedData)
if pemBlock == nil {
return nil, apperrors.Internal("Error while decoding pem block")
}
caCRT, err := x509.ParseCertificate(pemBlock.Bytes)
if err != nil {
return nil, apperrors.Internal("Error while parsing certificate: %s", err)
}
return caCRT, nil
}
func (cu *certificateUtility) LoadKey(encodedData []byte) (*rsa.PrivateKey, apperrors.AppError) {
pemBlock, _ := pem.Decode(encodedData)
if pemBlock == nil {
return nil, apperrors.Internal("Error while decoding pem block.")
}
if caPrivateKey, err := x509.ParsePKCS1PrivateKey(pemBlock.Bytes); err == nil {
return caPrivateKey, nil
}
caPrivateKey, err := x509.ParsePKCS8PrivateKey(pemBlock.Bytes)
if err != nil {
return nil, apperrors.Internal("Error while parsing private key: %s", err)
}
return caPrivateKey.(*rsa.PrivateKey), nil
}
func (cu *certificateUtility) LoadCSR(encodedData []byte) (*x509.CertificateRequest, apperrors.AppError) {
pemBlock, _ := pem.Decode(encodedData)
if pemBlock == nil {
return nil, apperrors.BadRequest("Error while decoding pem block.")
}
clientCSR, err := x509.ParseCertificateRequest(pemBlock.Bytes)
if err != nil {
return nil, apperrors.BadRequest("Error while parsing CSR: %s", err)
}
err = clientCSR.CheckSignature()
if err != nil {
return nil, apperrors.BadRequest("CSR signature invalid: %s", err)
}
return clientCSR, nil
}
func (cu *certificateUtility) CheckCSRValues(csr *x509.CertificateRequest, subject CSRSubject) apperrors.AppError {
if csr.Subject.CommonName != subject.CommonName {
return apperrors.WrongInput("CSR: Invalid common name provided.")
}
if csr.Subject.Country == nil {
return apperrors.WrongInput("CSR: No country provided.")
} else if csr.Subject.Country[0] != subject.Country {
return apperrors.WrongInput("CSR: Invalid country provided.")
}
if csr.Subject.Organization == nil {
return apperrors.WrongInput("CSR: No organization provided.")
} else if csr.Subject.Organization[0] != subject.Organization {
return apperrors.WrongInput("CSR: Invalid organization provided.")
}
if csr.Subject.OrganizationalUnit == nil {
return apperrors.WrongInput("CSR: No organizational unit provided.")
} else if csr.Subject.OrganizationalUnit[0] != subject.OrganizationalUnit {
return apperrors.WrongInput("CSR: Invalid organizational unit provided.")
}
if csr.Subject.Locality == nil {
return apperrors.WrongInput("CSR: No locality provided.")
} else if csr.Subject.Locality[0] != subject.Locality {
return apperrors.WrongInput("CSR: Invalid locality provided.")
}
if csr.Subject.Province == nil {
return apperrors.WrongInput("CSR: No province provided.")
} else if csr.Subject.Province[0] != subject.Province {
return apperrors.WrongInput("CSR: Invalid province provided.")
}
return nil
}
func (cu *certificateUtility) SignCSR(caCrt *x509.Certificate, csr *x509.CertificateRequest, caKey *rsa.PrivateKey) ([]byte, apperrors.AppError) {
clientCRTTemplate := cu.prepareCRTTemplate(csr)
clientCrtRaw, err := x509.CreateCertificate(rand.Reader, &clientCRTTemplate, caCrt, csr.PublicKey, caKey)
if err != nil {
return nil, apperrors.Internal("Error while creating certificate: %s", err)
}
return clientCrtRaw, nil
}
func (cu *certificateUtility) prepareCRTTemplate(csr *x509.CertificateRequest) x509.Certificate {
return x509.Certificate{
SignatureAlgorithm: csr.SignatureAlgorithm,
SerialNumber: big.NewInt(2),
Subject: csr.Subject,
NotBefore: time.Now(),
NotAfter: time.Now().Add(cu.certificateValidityTime),
KeyUsage: x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
}
}
func (cu *certificateUtility) AddCertificateHeaderAndFooter(crtRaw []byte) []byte {
return pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: crtRaw})
}