forked from TrueCloudLab/certificates
386 lines
12 KiB
Go
386 lines
12 KiB
Go
package cloudcas
|
|
|
|
import (
|
|
"crypto"
|
|
"crypto/ecdsa"
|
|
"crypto/rsa"
|
|
"crypto/x509"
|
|
"crypto/x509/pkix"
|
|
"encoding/asn1"
|
|
"encoding/pem"
|
|
"fmt"
|
|
|
|
"github.com/pkg/errors"
|
|
kmsapi "go.step.sm/crypto/kms/apiv1"
|
|
pb "google.golang.org/genproto/googleapis/cloud/security/privateca/v1"
|
|
)
|
|
|
|
var (
|
|
oidExtensionSubjectKeyID = []int{2, 5, 29, 14}
|
|
oidExtensionKeyUsage = []int{2, 5, 29, 15}
|
|
oidExtensionExtendedKeyUsage = []int{2, 5, 29, 37}
|
|
oidExtensionAuthorityKeyID = []int{2, 5, 29, 35}
|
|
oidExtensionBasicConstraints = []int{2, 5, 29, 19}
|
|
oidExtensionSubjectAltName = []int{2, 5, 29, 17}
|
|
oidExtensionCRLDistributionPoints = []int{2, 5, 29, 31}
|
|
oidExtensionCertificatePolicies = []int{2, 5, 29, 32}
|
|
oidExtensionAuthorityInfoAccess = []int{1, 3, 6, 1, 5, 5, 7, 1, 1}
|
|
)
|
|
|
|
var extraExtensions = [...]asn1.ObjectIdentifier{
|
|
oidExtensionSubjectKeyID, // Added by CAS
|
|
oidExtensionKeyUsage, // Added in CertificateConfig.ReusableConfig
|
|
oidExtensionExtendedKeyUsage, // Added in CertificateConfig.ReusableConfig
|
|
oidExtensionAuthorityKeyID, // Added by CAS
|
|
oidExtensionBasicConstraints, // Added in CertificateConfig.ReusableConfig
|
|
oidExtensionSubjectAltName, // Added in CertificateConfig.SubjectConfig.SubjectAltName
|
|
oidExtensionCRLDistributionPoints, // Added by CAS
|
|
oidExtensionCertificatePolicies, // Added in CertificateConfig.ReusableConfig
|
|
oidExtensionAuthorityInfoAccess, // Added in CertificateConfig.ReusableConfig and by CAS
|
|
}
|
|
|
|
var (
|
|
oidExtKeyUsageAny = asn1.ObjectIdentifier{2, 5, 29, 37, 0}
|
|
oidExtKeyUsageIPSECEndSystem = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 5}
|
|
oidExtKeyUsageIPSECTunnel = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 6}
|
|
oidExtKeyUsageIPSECUser = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 7}
|
|
oidExtKeyUsageMicrosoftServerGatedCrypto = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 311, 10, 3, 3}
|
|
oidExtKeyUsageNetscapeServerGatedCrypto = asn1.ObjectIdentifier{2, 16, 840, 1, 113730, 4, 1}
|
|
oidExtKeyUsageMicrosoftCommercialCodeSigning = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 311, 2, 1, 22}
|
|
oidExtKeyUsageMicrosoftKernelCodeSigning = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 311, 61, 1, 1}
|
|
)
|
|
|
|
const (
|
|
nameTypeEmail = 1
|
|
nameTypeDNS = 2
|
|
nameTypeURI = 6
|
|
nameTypeIP = 7
|
|
)
|
|
|
|
func createCertificateConfig(tpl *x509.Certificate) (*pb.Certificate_Config, error) {
|
|
pk, err := createPublicKey(tpl.PublicKey)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
config := &pb.CertificateConfig{
|
|
SubjectConfig: &pb.CertificateConfig_SubjectConfig{
|
|
Subject: createSubject(tpl),
|
|
SubjectAltName: createSubjectAlternativeNames(tpl),
|
|
},
|
|
X509Config: createX509Parameters(tpl),
|
|
PublicKey: pk,
|
|
}
|
|
return &pb.Certificate_Config{
|
|
Config: config,
|
|
}, nil
|
|
}
|
|
|
|
func createPublicKey(key crypto.PublicKey) (*pb.PublicKey, error) {
|
|
switch key := key.(type) {
|
|
case *ecdsa.PublicKey:
|
|
asn1Bytes, err := x509.MarshalPKIXPublicKey(key)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "error marshaling public key")
|
|
}
|
|
return &pb.PublicKey{
|
|
Format: pb.PublicKey_PEM,
|
|
Key: pem.EncodeToMemory(&pem.Block{
|
|
Type: "PUBLIC KEY",
|
|
Bytes: asn1Bytes,
|
|
}),
|
|
}, nil
|
|
case *rsa.PublicKey:
|
|
return &pb.PublicKey{
|
|
Format: pb.PublicKey_PEM,
|
|
Key: pem.EncodeToMemory(&pem.Block{
|
|
Type: "RSA PUBLIC KEY",
|
|
Bytes: x509.MarshalPKCS1PublicKey(key),
|
|
}),
|
|
}, nil
|
|
default:
|
|
return nil, errors.Errorf("unsupported public key type: %T", key)
|
|
}
|
|
}
|
|
|
|
func createSubject(cert *x509.Certificate) *pb.Subject {
|
|
sub := cert.Subject
|
|
ret := &pb.Subject{
|
|
CommonName: sub.CommonName,
|
|
}
|
|
if len(sub.Country) > 0 {
|
|
ret.CountryCode = sub.Country[0]
|
|
}
|
|
if len(sub.Organization) > 0 {
|
|
ret.Organization = sub.Organization[0]
|
|
}
|
|
if len(sub.OrganizationalUnit) > 0 {
|
|
ret.OrganizationalUnit = sub.OrganizationalUnit[0]
|
|
}
|
|
if len(sub.Locality) > 0 {
|
|
ret.Locality = sub.Locality[0]
|
|
}
|
|
if len(sub.Province) > 0 {
|
|
ret.Province = sub.Province[0]
|
|
}
|
|
if len(sub.StreetAddress) > 0 {
|
|
ret.StreetAddress = sub.StreetAddress[0]
|
|
}
|
|
if len(sub.PostalCode) > 0 {
|
|
ret.PostalCode = sub.PostalCode[0]
|
|
}
|
|
return ret
|
|
}
|
|
|
|
func createSubjectAlternativeNames(cert *x509.Certificate) *pb.SubjectAltNames {
|
|
ret := new(pb.SubjectAltNames)
|
|
ret.DnsNames = cert.DNSNames
|
|
ret.EmailAddresses = cert.EmailAddresses
|
|
if n := len(cert.IPAddresses); n > 0 {
|
|
ret.IpAddresses = make([]string, n)
|
|
for i, ip := range cert.IPAddresses {
|
|
ret.IpAddresses[i] = ip.String()
|
|
}
|
|
}
|
|
if n := len(cert.URIs); n > 0 {
|
|
ret.Uris = make([]string, n)
|
|
for i, u := range cert.URIs {
|
|
ret.Uris[i] = u.String()
|
|
}
|
|
}
|
|
|
|
// Add extra SANs coming from the extensions
|
|
if ext, ok := findExtraExtension(cert, oidExtensionSubjectAltName); ok {
|
|
var rawValues []asn1.RawValue
|
|
if _, err := asn1.Unmarshal(ext.Value, &rawValues); err == nil {
|
|
var newValues []asn1.RawValue
|
|
|
|
for _, v := range rawValues {
|
|
if v.Class == asn1.ClassContextSpecific {
|
|
switch v.Tag {
|
|
case nameTypeDNS:
|
|
if len(ret.DnsNames) == 0 {
|
|
newValues = append(newValues, v)
|
|
}
|
|
case nameTypeEmail:
|
|
if len(ret.EmailAddresses) == 0 {
|
|
newValues = append(newValues, v)
|
|
}
|
|
case nameTypeIP:
|
|
if len(ret.IpAddresses) == 0 {
|
|
newValues = append(newValues, v)
|
|
}
|
|
case nameTypeURI:
|
|
if len(ret.Uris) == 0 {
|
|
newValues = append(newValues, v)
|
|
}
|
|
default:
|
|
newValues = append(newValues, v)
|
|
}
|
|
} else {
|
|
newValues = append(newValues, v)
|
|
}
|
|
}
|
|
if len(newValues) > 0 {
|
|
if b, err := asn1.Marshal(newValues); err == nil {
|
|
ret.CustomSans = []*pb.X509Extension{{
|
|
ObjectId: createObjectID(ext.Id),
|
|
Critical: ext.Critical,
|
|
Value: b,
|
|
}}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return ret
|
|
}
|
|
|
|
func createX509Parameters(cert *x509.Certificate) *pb.X509Parameters {
|
|
var unknownEKUs []*pb.ObjectId
|
|
var ekuOptions = &pb.KeyUsage_ExtendedKeyUsageOptions{}
|
|
for _, eku := range cert.ExtKeyUsage {
|
|
switch eku {
|
|
case x509.ExtKeyUsageAny:
|
|
unknownEKUs = append(unknownEKUs, createObjectID(oidExtKeyUsageAny))
|
|
case x509.ExtKeyUsageServerAuth:
|
|
ekuOptions.ServerAuth = true
|
|
case x509.ExtKeyUsageClientAuth:
|
|
ekuOptions.ClientAuth = true
|
|
case x509.ExtKeyUsageCodeSigning:
|
|
ekuOptions.CodeSigning = true
|
|
case x509.ExtKeyUsageEmailProtection:
|
|
ekuOptions.EmailProtection = true
|
|
case x509.ExtKeyUsageIPSECEndSystem:
|
|
unknownEKUs = append(unknownEKUs, createObjectID(oidExtKeyUsageIPSECEndSystem))
|
|
case x509.ExtKeyUsageIPSECTunnel:
|
|
unknownEKUs = append(unknownEKUs, createObjectID(oidExtKeyUsageIPSECTunnel))
|
|
case x509.ExtKeyUsageIPSECUser:
|
|
unknownEKUs = append(unknownEKUs, createObjectID(oidExtKeyUsageIPSECUser))
|
|
case x509.ExtKeyUsageTimeStamping:
|
|
ekuOptions.TimeStamping = true
|
|
case x509.ExtKeyUsageOCSPSigning:
|
|
ekuOptions.OcspSigning = true
|
|
case x509.ExtKeyUsageMicrosoftServerGatedCrypto:
|
|
unknownEKUs = append(unknownEKUs, createObjectID(oidExtKeyUsageMicrosoftServerGatedCrypto))
|
|
case x509.ExtKeyUsageNetscapeServerGatedCrypto:
|
|
unknownEKUs = append(unknownEKUs, createObjectID(oidExtKeyUsageNetscapeServerGatedCrypto))
|
|
case x509.ExtKeyUsageMicrosoftCommercialCodeSigning:
|
|
unknownEKUs = append(unknownEKUs, createObjectID(oidExtKeyUsageMicrosoftCommercialCodeSigning))
|
|
case x509.ExtKeyUsageMicrosoftKernelCodeSigning:
|
|
unknownEKUs = append(unknownEKUs, createObjectID(oidExtKeyUsageMicrosoftKernelCodeSigning))
|
|
}
|
|
}
|
|
|
|
for _, oid := range cert.UnknownExtKeyUsage {
|
|
unknownEKUs = append(unknownEKUs, createObjectID(oid))
|
|
}
|
|
|
|
var policyIDs []*pb.ObjectId
|
|
for _, oid := range cert.PolicyIdentifiers {
|
|
policyIDs = append(policyIDs, createObjectID(oid))
|
|
}
|
|
|
|
var caOptions *pb.X509Parameters_CaOptions
|
|
if cert.BasicConstraintsValid {
|
|
caOptions = new(pb.X509Parameters_CaOptions)
|
|
var maxPathLength int32
|
|
switch {
|
|
case cert.MaxPathLenZero:
|
|
maxPathLength = 0
|
|
caOptions.MaxIssuerPathLength = &maxPathLength
|
|
case cert.MaxPathLen > 0:
|
|
maxPathLength = int32(cert.MaxPathLen)
|
|
caOptions.MaxIssuerPathLength = &maxPathLength
|
|
}
|
|
caOptions.IsCa = &cert.IsCA
|
|
}
|
|
|
|
var extraExtensions []*pb.X509Extension
|
|
for _, ext := range cert.ExtraExtensions {
|
|
if isExtraExtension(ext.Id) {
|
|
extraExtensions = append(extraExtensions, &pb.X509Extension{
|
|
ObjectId: createObjectID(ext.Id),
|
|
Critical: ext.Critical,
|
|
Value: ext.Value,
|
|
})
|
|
}
|
|
}
|
|
|
|
return &pb.X509Parameters{
|
|
KeyUsage: &pb.KeyUsage{
|
|
BaseKeyUsage: &pb.KeyUsage_KeyUsageOptions{
|
|
DigitalSignature: cert.KeyUsage&x509.KeyUsageDigitalSignature > 0,
|
|
ContentCommitment: cert.KeyUsage&x509.KeyUsageContentCommitment > 0,
|
|
KeyEncipherment: cert.KeyUsage&x509.KeyUsageKeyEncipherment > 0,
|
|
DataEncipherment: cert.KeyUsage&x509.KeyUsageDataEncipherment > 0,
|
|
KeyAgreement: cert.KeyUsage&x509.KeyUsageKeyAgreement > 0,
|
|
CertSign: cert.KeyUsage&x509.KeyUsageCertSign > 0,
|
|
CrlSign: cert.KeyUsage&x509.KeyUsageCRLSign > 0,
|
|
EncipherOnly: cert.KeyUsage&x509.KeyUsageEncipherOnly > 0,
|
|
DecipherOnly: cert.KeyUsage&x509.KeyUsageDecipherOnly > 0,
|
|
},
|
|
ExtendedKeyUsage: ekuOptions,
|
|
UnknownExtendedKeyUsages: unknownEKUs,
|
|
},
|
|
CaOptions: caOptions,
|
|
PolicyIds: policyIDs,
|
|
AiaOcspServers: cert.OCSPServer,
|
|
AdditionalExtensions: extraExtensions,
|
|
}
|
|
}
|
|
|
|
// isExtraExtension returns true if the extension oid is not managed in a
|
|
// different way.
|
|
func isExtraExtension(oid asn1.ObjectIdentifier) bool {
|
|
for _, id := range extraExtensions {
|
|
if id.Equal(oid) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func createObjectID(oid asn1.ObjectIdentifier) *pb.ObjectId {
|
|
ret := make([]int32, len(oid))
|
|
for i, v := range oid {
|
|
ret[i] = int32(v)
|
|
}
|
|
return &pb.ObjectId{
|
|
ObjectIdPath: ret,
|
|
}
|
|
}
|
|
|
|
func findExtraExtension(cert *x509.Certificate, oid asn1.ObjectIdentifier) (pkix.Extension, bool) {
|
|
for _, ext := range cert.ExtraExtensions {
|
|
if ext.Id.Equal(oid) {
|
|
return ext, true
|
|
}
|
|
}
|
|
return pkix.Extension{}, false
|
|
}
|
|
|
|
func createKeyVersionSpec(alg kmsapi.SignatureAlgorithm, bits int) (*pb.CertificateAuthority_KeyVersionSpec, error) {
|
|
switch alg {
|
|
case kmsapi.UnspecifiedSignAlgorithm, kmsapi.ECDSAWithSHA256:
|
|
return &pb.CertificateAuthority_KeyVersionSpec{
|
|
KeyVersion: &pb.CertificateAuthority_KeyVersionSpec_Algorithm{
|
|
Algorithm: pb.CertificateAuthority_EC_P256_SHA256,
|
|
},
|
|
}, nil
|
|
case kmsapi.ECDSAWithSHA384:
|
|
return &pb.CertificateAuthority_KeyVersionSpec{
|
|
KeyVersion: &pb.CertificateAuthority_KeyVersionSpec_Algorithm{
|
|
Algorithm: pb.CertificateAuthority_EC_P384_SHA384,
|
|
},
|
|
}, nil
|
|
case kmsapi.SHA256WithRSA:
|
|
algo, err := getRSAPKCS1Algorithm(bits)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &pb.CertificateAuthority_KeyVersionSpec{
|
|
KeyVersion: &pb.CertificateAuthority_KeyVersionSpec_Algorithm{
|
|
Algorithm: algo,
|
|
},
|
|
}, nil
|
|
case kmsapi.SHA256WithRSAPSS:
|
|
algo, err := getRSAPSSAlgorithm(bits)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &pb.CertificateAuthority_KeyVersionSpec{
|
|
KeyVersion: &pb.CertificateAuthority_KeyVersionSpec_Algorithm{
|
|
Algorithm: algo,
|
|
},
|
|
}, nil
|
|
default:
|
|
return nil, fmt.Errorf("unknown or unsupported signature algorithm '%s'", alg)
|
|
}
|
|
}
|
|
|
|
func getRSAPKCS1Algorithm(bits int) (pb.CertificateAuthority_SignHashAlgorithm, error) {
|
|
switch bits {
|
|
case 0, 3072:
|
|
return pb.CertificateAuthority_RSA_PKCS1_3072_SHA256, nil
|
|
case 2048:
|
|
return pb.CertificateAuthority_RSA_PKCS1_2048_SHA256, nil
|
|
case 4096:
|
|
return pb.CertificateAuthority_RSA_PKCS1_4096_SHA256, nil
|
|
default:
|
|
return 0, fmt.Errorf("unsupported RSA PKCS #1 key size '%d'", bits)
|
|
}
|
|
}
|
|
|
|
func getRSAPSSAlgorithm(bits int) (pb.CertificateAuthority_SignHashAlgorithm, error) {
|
|
switch bits {
|
|
case 0, 3072:
|
|
return pb.CertificateAuthority_RSA_PSS_3072_SHA256, nil
|
|
case 2048:
|
|
return pb.CertificateAuthority_RSA_PSS_2048_SHA256, nil
|
|
case 4096:
|
|
return pb.CertificateAuthority_RSA_PSS_4096_SHA256, nil
|
|
default:
|
|
return 0, fmt.Errorf("unsupported RSA-PSS key size '%d'", bits)
|
|
}
|
|
}
|