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x509engine.go
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x509engine.go
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package x509engines
import (
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"crypto/sha512"
"crypto/x509"
"crypto/x509/pkix"
"encoding/asn1"
"errors"
"fmt"
"hash"
"math/big"
"slices"
"strings"
"time"
"github.com/lamassuiot/lamassuiot/v2/pkg/cryptoengines"
"github.com/lamassuiot/lamassuiot/v2/pkg/errs"
"github.com/lamassuiot/lamassuiot/v2/pkg/helpers"
"github.com/lamassuiot/lamassuiot/v2/pkg/models"
"github.com/sirupsen/logrus"
)
var lCEngine *logrus.Entry = logrus.WithField("", "")
func SetCryptoEngineLogger(lgr *logrus.Entry) {
lCEngine = lgr
}
type X509Engine struct {
cryptoEngine cryptoengines.CryptoEngine
validationAuthorityDomain string
}
func NewX509Engine(cryptoEngine *cryptoengines.CryptoEngine, validationAuthorityDomain string) X509Engine {
return X509Engine{
cryptoEngine: *cryptoEngine,
validationAuthorityDomain: validationAuthorityDomain,
}
}
func (engine X509Engine) GetEngineConfig() models.CryptoEngineInfo {
return engine.cryptoEngine.GetEngineConfig()
}
func (engine X509Engine) GetCACryptoSigner(caCertificate *x509.Certificate) (crypto.Signer, error) {
caSn := helpers.SerialNumberToString(caCertificate.SerialNumber)
return engine.cryptoEngine.GetPrivateKeyByID(caSn)
}
func (engine X509Engine) CreateRootCA(caID string, keyMetadata models.KeyMetadata, subject models.Subject, expirationTine time.Time) (*x509.Certificate, error) {
lCEngine.Debugf("starting root CA generation with key metadata [%v], subject [%v] and expiration time [%s]", keyMetadata, subject, expirationTine)
templateCA, signer, err := engine.genCertTemplateAndPrivateKey(keyMetadata, subject, expirationTine, caID, caID)
if err != nil {
lCEngine.Errorf("could not generate root CA Template and Key: %s", err)
return nil, err
}
lCEngine.Debugf("public-private key successfully generated")
templateCA.IsCA = true
var derBytes []byte
if models.KeyType(keyMetadata.Type) == models.KeyType(x509.RSA) {
rsaPub := signer.Public().(*rsa.PublicKey)
derBytes, err = x509.CreateCertificate(rand.Reader, templateCA, templateCA, rsaPub, signer)
if err != nil {
lCEngine.Errorf("could not sign root CA: %s", err)
return nil, err
}
} else {
ecdsaPub := signer.Public().(*ecdsa.PublicKey)
derBytes, err = x509.CreateCertificate(rand.Reader, templateCA, templateCA, ecdsaPub, signer)
if err != nil {
lCEngine.Errorf("could not sign root CA: %s", err)
return nil, err
}
}
cert, err := x509.ParseCertificate(derBytes)
if err != nil {
lCEngine.Errorf("could not parse root CA: %s", err)
return nil, err
}
lCEngine.Debugf("root CA successfully generated with serial number [%s]", helpers.SerialNumberToString(cert.SerialNumber))
return cert, nil
}
func (engine X509Engine) CreateSubordinateCA(aki string, caID string, parentCACertificate *x509.Certificate, keyMetadata models.KeyMetadata, subject models.Subject, expirationTine time.Time, parentEngine X509Engine) (*x509.Certificate, error) {
templateCA, signer, err := engine.genCertTemplateAndPrivateKey(keyMetadata, subject, expirationTine, aki, caID)
if err != nil {
lCEngine.Errorf("could not generate subordinate CA Template and Key: %s", err)
return nil, err
}
var pubKey interface{}
if models.KeyType(keyMetadata.Type) == models.KeyType(x509.RSA) {
pubKey = signer.Public().(*rsa.PublicKey)
} else {
pubKey = signer.Public().(*ecdsa.PublicKey)
}
parentSN := helpers.SerialNumberToString(parentCACertificate.SerialNumber)
parentCASigner, err := parentEngine.cryptoEngine.GetPrivateKeyByID(CryptoAssetLRI(CertificateAuthority, parentSN))
if err != nil {
lCEngine.Errorf("could not get parent signer key '%s': %s", parentSN, err)
return nil, err
}
templateCA.IsCA = true
certificateBytes, err := x509.CreateCertificate(rand.Reader, templateCA, parentCACertificate, pubKey, parentCASigner)
if err != nil {
lCEngine.Errorf("could not sign subordinate CA: %s", err)
return nil, err
}
certificate, err := x509.ParseCertificate(certificateBytes)
if err != nil {
lCEngine.Errorf("could not parse subordinate CA: %s", err)
return nil, err
}
return certificate, nil
}
func (engine X509Engine) SignCertificateRequest(caCertificate *x509.Certificate, csr *x509.CertificateRequest, expirationDate time.Time) (*x509.Certificate, error) {
lCEngine.Debugf("starting csr signing with CA [%s]", caCertificate.Subject.CommonName)
lCEngine.Debugf("csr cn is [%s]", csr.Subject.CommonName)
caSn := helpers.SerialNumberToString(caCertificate.SerialNumber)
lCEngine.Debugf("requesting CA signer object to crypto engine instance")
privkey, err := engine.cryptoEngine.GetPrivateKeyByID(CryptoAssetLRI(CertificateAuthority, caSn))
if err != nil {
return nil, err
}
lCEngine.Debugf("successfully retrieved CA signer object")
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
sn, _ := rand.Int(rand.Reader, serialNumberLimit)
now := time.Now()
allowedExtOIDs := []asn1.ObjectIdentifier{
{2, 5, 29, 17}, //SAN OID
}
exts := []pkix.Extension{}
for _, csrExt := range csr.Extensions {
if slices.ContainsFunc(allowedExtOIDs, func(id asn1.ObjectIdentifier) bool {
for _, allowedExt := range allowedExtOIDs {
if allowedExt.Equal(csrExt.Id) {
return true
}
}
return false
}) {
exts = append(exts, csrExt)
}
}
certificateTemplate := x509.Certificate{
PublicKeyAlgorithm: csr.PublicKeyAlgorithm,
PublicKey: csr.PublicKey,
AuthorityKeyId: caCertificate.SubjectKeyId,
SerialNumber: sn,
Issuer: caCertificate.Subject,
Subject: csr.Subject,
NotBefore: now,
NotAfter: expirationDate,
KeyUsage: x509.KeyUsageDigitalSignature,
ExtraExtensions: exts,
OCSPServer: []string{
fmt.Sprintf("https://%s/api/va/ocsp", engine.validationAuthorityDomain),
},
CRLDistributionPoints: []string{
fmt.Sprintf("https://%s/api/va/crl/%s", engine.validationAuthorityDomain, string(caCertificate.SubjectKeyId)),
},
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
}
certificateBytes, err := x509.CreateCertificate(rand.Reader, &certificateTemplate, caCertificate, csr.PublicKey, privkey)
if err != nil {
lCEngine.Errorf("could not sign certificate: %s", err)
return nil, err
}
certificate, err := x509.ParseCertificate(certificateBytes)
if err != nil {
lCEngine.Errorf("could not parse signed certificate %s", err)
return nil, err
}
return certificate, nil
}
func (engine X509Engine) genCertTemplateAndPrivateKey(keyMetadata models.KeyMetadata, subject models.Subject, expirationTine time.Time, aki, ski string) (*x509.Certificate, crypto.Signer, error) {
var err error
var signer crypto.Signer
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
sn, _ := rand.Int(rand.Reader, serialNumberLimit)
lCEngine.Debugf("generates serial number for root CA is [%s]", helpers.SerialNumberToString(sn))
lri := CryptoAssetLRI(CertificateAuthority, helpers.SerialNumberToString(sn))
if models.KeyType(keyMetadata.Type) == models.KeyType(x509.RSA) {
lCEngine.Debugf("requesting cryptoengine instance for RSA key generation: %s", lri)
signer, err = engine.cryptoEngine.CreateRSAPrivateKey(keyMetadata.Bits, lri)
if err != nil {
lCEngine.Errorf("cryptoengine instance failed while generating RSA key: %s", err)
return nil, nil, err
}
lCEngine.Debugf("cryptoengine successfully generated RSA key")
} else {
var curve elliptic.Curve
switch keyMetadata.Bits {
case 224:
curve = elliptic.P224()
case 256:
curve = elliptic.P256()
case 384:
curve = elliptic.P384()
case 521:
curve = elliptic.P521()
default:
return nil, nil, errors.New("unsupported key size for ECDSA key")
}
lCEngine.Debugf("requesting cryptoengine instance for ECDSA key generation: %s", lri)
signer, err = engine.cryptoEngine.CreateECDSAPrivateKey(curve, lri)
if err != nil {
lCEngine.Errorf("cryptoengine instance failed while generating ECDSA key: %s", err)
return nil, nil, err
}
lCEngine.Debugf("cryptoengine successfully generated ECDSA key")
}
now := time.Now()
template := x509.Certificate{
SerialNumber: sn,
Subject: helpers.SubjectToPkixName(subject),
AuthorityKeyId: []byte(aki),
SubjectKeyId: []byte(ski),
OCSPServer: []string{
fmt.Sprintf("https://%s/ocsp", engine.validationAuthorityDomain),
},
CRLDistributionPoints: []string{
fmt.Sprintf("https://%s/crl/%s", engine.validationAuthorityDomain, ski),
},
NotBefore: now,
NotAfter: expirationTine,
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign | x509.KeyUsageCRLSign | x509.KeyUsage(x509.ExtKeyUsageOCSPSigning),
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
return &template, signer, nil
}
func (engine X509Engine) Sign(cAssetType CryptoAssetType, certificate *x509.Certificate, message []byte, messageType models.SignMessageType, signingAlgorithm string) ([]byte, error) {
lCEngine.Debugf("starting standard signing with certificate [%s]", certificate.Subject.CommonName)
sn := helpers.SerialNumberToString(certificate.SerialNumber)
lCEngine.Debugf("requesting signer object to crypto engine instance")
privkey, err := engine.cryptoEngine.GetPrivateKeyByID(CryptoAssetLRI(cAssetType, sn))
if err != nil {
return nil, err
}
lCEngine.Debugf("successfully retrieved certificate signer object")
if certificate.PublicKeyAlgorithm == x509.ECDSA {
var digest []byte
var hashFunc crypto.Hash
var h hash.Hash
if signingAlgorithm == "ECDSA_SHA_256" {
h = sha256.New()
hashFunc = crypto.SHA256
} else if signingAlgorithm == "ECDSA_SHA_384" {
h = sha512.New384()
hashFunc = crypto.SHA384
} else if signingAlgorithm == "ECDSA_SHA_512" {
h = sha512.New()
hashFunc = crypto.SHA512
} else {
return nil, errs.ErrEngineAlgNotSupported
}
if messageType == models.Raw {
h.Write(message)
digest = h.Sum(nil)
} else {
digest = message
}
signature, err := privkey.Sign(rand.Reader, digest, hashFunc)
if err != nil {
return nil, err
}
return signature, nil
} else if certificate.PublicKeyAlgorithm == x509.RSA {
var digest []byte
var hashFunc crypto.Hash
var h hash.Hash
if signingAlgorithm == "RSASSA_PSS_SHA_256" || signingAlgorithm == "RSASSA_PKCS1_V1_5_SHA_256" {
h = sha256.New()
hashFunc = crypto.SHA256
} else if signingAlgorithm == "RSASSA_PSS_SHA_384" || signingAlgorithm == "RSASSA_PKCS1_V1_5_SHA_384" {
h = sha512.New384()
hashFunc = crypto.SHA384
} else if signingAlgorithm == "RSASSA_PSS_SHA_512" || signingAlgorithm == "RSASSA_PKCS1_V1_5_SHA_512" {
h = sha512.New()
hashFunc = crypto.SHA512
} else {
return nil, errs.ErrEngineAlgNotSupported
}
if messageType == models.Raw {
h.Write(message)
digest = h.Sum(nil)
} else {
digest = message
}
sigAlg := strings.Split(signingAlgorithm, "_")
if sigAlg[1] == "PSS" {
var saltLength int
switch hashFunc {
case crypto.SHA256:
saltLength = 32
case crypto.SHA384:
saltLength = 48
case crypto.SHA512:
saltLength = 64
}
signature, err := privkey.Sign(rand.Reader, digest, &rsa.PSSOptions{
SaltLength: saltLength,
Hash: hashFunc,
})
if err != nil {
return nil, errs.ErrEngineHashAlgInconsistency
}
return signature, nil
} else {
signature, err := privkey.Sign(rand.Reader, digest, hashFunc)
if err != nil {
return nil, err
}
return signature, nil
}
} else {
return nil, fmt.Errorf("certificate has unsupported public key algorithm: %s", certificate.PublicKeyAlgorithm)
}
}
func (engine X509Engine) Verify(caCertificate *x509.Certificate, signature []byte, message []byte, messageType models.SignMessageType, signingAlgorithm string) (bool, error) {
var err error
if caCertificate.PublicKeyAlgorithm == x509.ECDSA {
var hasher []byte
var h hash.Hash
if signingAlgorithm == "ECDSA_SHA_256" {
h = sha256.New()
} else if signingAlgorithm == "ECDSA_SHA_384" {
h = sha512.New384()
} else if signingAlgorithm == "ECDSA_SHA_512" {
h = sha512.New()
} else {
return false, errs.ErrEngineAlgNotSupported
}
if messageType == models.Raw {
h.Write(message)
hasher = h.Sum(nil)
} else {
hasher = message
}
pubK := caCertificate.PublicKey
ecdsaKey, _ := pubK.(*ecdsa.PublicKey)
return ecdsa.VerifyASN1(ecdsaKey, hasher, signature), nil
} else if caCertificate.PublicKeyAlgorithm == x509.RSA {
var hasher []byte
var hashFunc crypto.Hash
var h hash.Hash
if signingAlgorithm == "RSASSA_PSS_SHA_256" || signingAlgorithm == "RSASSA_PKCS1_V1_5_SHA_256" {
h = sha256.New()
hashFunc = crypto.SHA256
} else if signingAlgorithm == "RSASSA_PSS_SHA_384" || signingAlgorithm == "RSASSA_PKCS1_V1_5_SHA_384" {
h = sha512.New384()
hashFunc = crypto.SHA384
} else if signingAlgorithm == "RSASSA_PSS_SHA_512" || signingAlgorithm == "RSASSA_PKCS1_V1_5_SHA_512" {
h = sha512.New()
hashFunc = crypto.SHA512
} else {
return false, errs.ErrEngineAlgNotSupported
}
if messageType == models.Raw {
h.Write(message)
hasher = h.Sum(nil)
} else {
hasher = message
}
pubK := caCertificate.PublicKey
rsaKey, _ := pubK.(*rsa.PublicKey)
sigAlg := strings.Split(signingAlgorithm, "_")
if sigAlg[1] == "PSS" {
var saltLength int
switch hashFunc {
case crypto.SHA256:
saltLength = 32
case crypto.SHA384:
saltLength = 48
case crypto.SHA512:
saltLength = 64
}
err = rsa.VerifyPSS(rsaKey, hashFunc, hasher, signature, &rsa.PSSOptions{
SaltLength: saltLength,
Hash: hashFunc,
})
if err != nil {
return false, err
}
return true, nil
} else {
err = rsa.VerifyPKCS1v15(rsaKey, hashFunc, hasher, signature)
if err != nil {
return false, err
}
return true, nil
}
} else {
return false, fmt.Errorf("CA has unsupported public key algorithm: %s", caCertificate.PublicKeyAlgorithm)
}
}
type CryptoAssetType string
const (
CertificateAuthority CryptoAssetType = "certauth"
Certificate CryptoAssetType = "cert"
)
func CryptoAssetLRI(cryptoAssetType CryptoAssetType, keyID string) string {
return fmt.Sprintf("lms-caservice-%s-keyid-%s", cryptoAssetType, keyID)
}