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certificate.go
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certificate.go
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/*
* Copyright 2018 Venafi, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package certificate
import (
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"net"
"net/url"
"strings"
"time"
"github.com/Venafi/vcert/v4/pkg/verror"
)
// EllipticCurve represents the types of supported elliptic curves
type EllipticCurve int
func (ec *EllipticCurve) String() string {
switch *ec {
case EllipticCurveP521:
return "P521"
case EllipticCurveP384:
return "P384"
case EllipticCurveP256:
return "P256"
default:
return ""
}
}
// Set EllipticCurve value via a string
func (ec *EllipticCurve) Set(value string) error {
switch strings.ToLower(value) {
case "p521", "p-521":
*ec = EllipticCurveP521
case "p384", "p-384":
*ec = EllipticCurveP384
case "p256", "p-256":
*ec = EllipticCurveP256
default:
*ec = EllipticCurveDefault
}
return nil
}
const (
EllipticCurveNotSet EllipticCurve = iota
// EllipticCurveP521 represents the P521 curve
EllipticCurveP521
// EllipticCurveP256 represents the P256 curve
EllipticCurveP256
// EllipticCurveP384 represents the P384 curve
EllipticCurveP384
EllipticCurveDefault = EllipticCurveP256
defaultRSAlength int = 2048
)
func AllSupportedCurves() []EllipticCurve {
return []EllipticCurve{EllipticCurveP521, EllipticCurveP256, EllipticCurveP384}
}
func AllSupportedKeySizes() []int {
return []int{1024, 2048, 4096, 8192}
}
// KeyType represents the types of supported keys
type KeyType int
func (kt *KeyType) String() string {
switch *kt {
case KeyTypeRSA:
return "RSA"
case KeyTypeECDSA:
return "ECDSA"
default:
return ""
}
}
func (kt *KeyType) X509Type() x509.PublicKeyAlgorithm {
switch *kt {
case KeyTypeRSA:
return x509.RSA
case KeyTypeECDSA:
return x509.ECDSA
}
return x509.UnknownPublicKeyAlgorithm
}
// Set the key type via a string
func (kt *KeyType) Set(value string) error {
switch strings.ToLower(value) {
case "rsa":
*kt = KeyTypeRSA
return nil
case "ecdsa", "ec", "ecc":
*kt = KeyTypeECDSA
return nil
}
return fmt.Errorf("%w: unknown key type: %s", verror.VcertError, value) //todo: check all calls
}
const (
// KeyTypeRSA represents a key type of RSA
KeyTypeRSA KeyType = iota
// KeyTypeECDSA represents a key type of ECDSA
KeyTypeECDSA
)
type CSrOriginOption int
const (
// LocalGeneratedCSR - this vcert library generates CSR internally based on Request data
LocalGeneratedCSR CSrOriginOption = iota // local generation is default.
// ServiceGeneratedCSR - server generate CSR internally based on zone configuration and data from Request
ServiceGeneratedCSR
// UserProvidedCSR - client provides CSR from external resource and vcert library just check and send this CSR to server
UserProvidedCSR
)
type CustomFieldType int
const (
CustomFieldPlain CustomFieldType = 0 + iota
CustomFieldOrigin
)
// CustomField can be used for adding additional information to certificate. For example: custom fields or Origin.
// By default it's custom field. For adding Origin set Type: CustomFieldOrigin
// For adding custom field with one name and few values give to request:
// request.CustomFields = []CustomField{
// {Name: "name1", Value: "value1"}
// {Name: "name1", Value: "value2"}
// }
type CustomField struct {
Type CustomFieldType
Name string
Value string
}
type Location struct {
Instance, Workload, TLSAddress string
Replace bool
}
// Request contains data needed to generate a certificate request
// CSR is a PEM-encoded Certificate Signing Request
type Request struct {
CADN string
Subject pkix.Name
DNSNames []string
OmitSANs bool
EmailAddresses []string
IPAddresses []net.IP
URIs []*url.URL
UPNs []string
Attributes []pkix.AttributeTypeAndValueSET
SignatureAlgorithm x509.SignatureAlgorithm
FriendlyName string
KeyType KeyType
KeyLength int
KeyCurve EllipticCurve
csr []byte // should be a PEM-encoded CSR
PrivateKey crypto.Signer
CsrOrigin CSrOriginOption
PickupID string
//Cloud Certificate ID
CertID string
ChainOption ChainOption
KeyPassword string
FetchPrivateKey bool
/* Thumbprint is here because *Request is used in RetrieveCertificate().
Code should be refactored so that RetrieveCertificate() uses some abstract search object, instead of *Request{PickupID} */
Thumbprint string
Timeout time.Duration
CustomFields []CustomField
Location *Location
ValidityHours int
IssuerHint string
}
//SSH Certificate structures
//This request is a standard one, it will hold data for tpp request
//and in the future it will hold VaS data.
type SshCertRequest struct {
Template string
PolicyDN string
ObjectName string
DestinationAddresses []string
KeyId string
Principals []string
ValidityPeriod string
PublicKeyData string
Extensions []string
ForceCommand string
SourceAddresses []string
PickupID string
Guid string
IncludePrivateKeyData bool
PrivateKeyPassphrase string
PrivateKeyFormat string
IncludeCertificateDetails bool
Timeout time.Duration
}
type TPPSshCertRequest struct {
CADN string `json:"CADN,omitempty"`
PolicyDN string `json:"PolicyDN,omitempty"`
ObjectName string `json:"ObjectName,omitempty"`
DestinationAddresses []string `json:"DestinationAddresses,omitempty"`
KeyId string `json:"KeyId,omitempty"`
Principals []string `json:"Principals,omitempty"`
ValidityPeriod string `json:"ValidityPeriod,omitempty"`
PublicKeyData string `json:"PublicKeyData,omitempty"`
Extensions map[string]interface{} `json:"Extensions,omitempty"`
ForceCommand string `json:"ForceCommand,omitempty"`
SourceAddresses []string `json:"SourceAddresses,omitempty"`
IncludePrivateKeyData bool `json:"IncludePrivateKeyData,omitempty"`
PrivateKeyPassphrase string `json:"PrivateKeyPassphrase,omitempty"`
IncludeCertificateDetails bool `json:"IncludeCertificateDetails,omitempty"`
ProcessingTimeout string `json:"ProcessingTimeout,omitempty"`
}
type TppSshCertResponseInfo struct {
ErrorCode int
ErrorMessage string
Success bool
}
type TppSshCertRetrieveRequest struct {
Guid string
DN string
IncludePrivateKeyData bool
PrivateKeyPassphrase string
PrivateKeyFormat string
IncludeCertificateDetails bool
}
type TppSshCertOperationResponse struct {
ProcessingDetails ProcessingDetails
Guid string
DN string
CertificateData string
PrivateKeyData string
PublicKeyData string
CAGuid string
CADN string
CertificateDetails SshCertificateDetails
Response TppSshCertResponseInfo
}
type SshCertificateObject struct {
Guid string
DN string
CAGuid string
CADN string
CertificateData string
PrivateKeyData string
PublicKeyData string
CertificateDetails SshCertificateDetails
ProcessingDetails ProcessingDetails
}
type SshCertificateDetails struct {
KeyType string `json:"KeyType,omitempty"`
CertificateType string `json:"CertificateType,omitempty"`
CertificateFingerprintSHA256 string `json:"CertificateFingerprintSHA256,omitempty"`
CAFingerprintSHA256 string `json:"CAFingerprintSHA256,omitempty"`
KeyID string `json:"KeyID,omitempty"`
SerialNumber string `json:"SerialNumber,omitempty"`
Principals []string `json:"Principals,omitempty"`
ValidFrom int64 `json:"ValidFrom,omitempty"`
ValidTo int64 `json:"ValidTo,omitempty"`
ForceCommand string `json:"ForceCommand,omitempty"`
SourceAddresses []string `json:"SourceAddresses,omitempty"`
PublicKeyFingerprintSHA256 string `json:"PublicKeyFingerprintSHA256,omitempty"`
Extensions map[string]interface{} `json:"Extensions,omitempty"`
}
type ProcessingDetails struct {
Status string `json:"Status,omitempty"`
StatusDescription string `json:"StatusDescription,omitempty"`
}
type RevocationRequest struct {
CertificateDN string
Thumbprint string
Reason string
Comments string
Disable bool
}
type RenewalRequest struct {
CertificateDN string // these fields are for certificate lookup on remote
Thumbprint string
CertificateRequest *Request // here CSR should be filled
}
type ImportRequest struct {
PolicyDN string
ObjectName string
CertificateData string
PrivateKeyData string
Password string
Reconcile bool
CustomFields []CustomField
}
type ImportResponse struct {
CertificateDN string `json:",omitempty"`
CertId string `json:",omitempty"`
CertificateVaultId int `json:",omitempty"`
Guid string `json:",omitempty"`
PrivateKeyVaultId int `json:",omitempty"`
}
type CertificateInfo struct {
ID string
CN string
SANS struct {
DNS, Email, IP, URI, UPN []string
}
Serial string
Thumbprint string
ValidFrom time.Time
ValidTo time.Time
}
// SetCSR sets CSR from PEM or DER format
func (request *Request) SetCSR(csr []byte) error {
pemBlock, _ := pem.Decode(csr)
if pemBlock != nil {
if strings.HasSuffix(pemBlock.Type, "CERTIFICATE REQUEST") {
request.csr = csr
return nil
}
}
//Determine CSR type and use appropriate function
parsedCSR, err := x509.ParseCertificateRequest(csr)
if err != nil {
return err
}
if parsedCSR != nil {
request.csr = pem.EncodeToMemory(GetCertificateRequestPEMBlock(csr))
return nil
}
return fmt.Errorf("%w: can't determine CSR type for %s", verror.UserDataError, csr)
}
// GetCSR returns CSR in PEM format
func (request Request) GetCSR() []byte {
return request.csr
}
// GenerateRequest generates a certificate request
// Please use method Request.GenerateCSR()
// TODO: Remove usage from all libraries, deprecated
func GenerateRequest(request *Request, privateKey crypto.Signer) error {
pk := request.PrivateKey
request.PrivateKey = privateKey
err := request.GenerateCSR()
request.PrivateKey = pk
return err
}
// GenerateCSR creates CSR for sending to server based on data from Request fields. It rewrites CSR field if it`s already filled.
func (request *Request) GenerateCSR() error {
certificateRequest := x509.CertificateRequest{}
certificateRequest.Subject = request.Subject
if !request.OmitSANs {
certificateRequest.DNSNames = request.DNSNames
certificateRequest.EmailAddresses = request.EmailAddresses
certificateRequest.IPAddresses = request.IPAddresses
certificateRequest.URIs = request.URIs
if len(request.UPNs) > 0 {
addUserPrincipalNameSANs(&certificateRequest, request.UPNs)
}
}
certificateRequest.Attributes = request.Attributes
csr, err := x509.CreateCertificateRequest(rand.Reader, &certificateRequest, request.PrivateKey)
if err != nil {
csr = nil
}
err = request.SetCSR(csr)
//request.CSR = pem.EncodeToMemory(GetCertificateRequestPEMBlock(csr))
return err
}
// GeneratePrivateKey creates private key (if it doesn`t already exist) based on request.KeyType, request.KeyLength and request.KeyCurve fileds
func (request *Request) GeneratePrivateKey() error {
if request.PrivateKey != nil {
return nil
}
var err error
switch request.KeyType {
case KeyTypeECDSA:
request.PrivateKey, err = GenerateECDSAPrivateKey(request.KeyCurve)
case KeyTypeRSA:
if request.KeyLength == 0 {
request.KeyLength = defaultRSAlength
}
if request.KeyLength < AllSupportedKeySizes()[0] {
return fmt.Errorf("key Size must be %d or greater. But it is %d", AllSupportedKeySizes()[0], request.KeyLength)
}
request.PrivateKey, err = GenerateRSAPrivateKey(request.KeyLength)
default:
return fmt.Errorf("%w: unable to generate certificate request, key type %s is not supported", verror.VcertError, request.KeyType.String())
}
return err
}
// CheckCertificate validate that certificate returned by server matches data in request object. It can be used for control server.
func (request *Request) CheckCertificate(certPEM string) error {
pemBlock, _ := pem.Decode([]byte(certPEM))
if pemBlock == nil {
return fmt.Errorf("%w: invalid pem format certificate %s", verror.CertificateCheckError, certPEM)
}
if pemBlock.Type != "CERTIFICATE" {
return fmt.Errorf("%w: invalid pem type %s (expect CERTIFICATE)", verror.CertificateCheckError, pemBlock.Type)
}
cert, err := x509.ParseCertificate(pemBlock.Bytes)
if err != nil {
return err
}
if request.PrivateKey != nil {
if request.KeyType.X509Type() != cert.PublicKeyAlgorithm {
return fmt.Errorf("%w: unmatched key type: %s, %s", verror.CertificateCheckError, request.KeyType.X509Type(), cert.PublicKeyAlgorithm)
}
switch cert.PublicKeyAlgorithm {
case x509.RSA:
certPubKey := cert.PublicKey.(*rsa.PublicKey)
reqPubkey, ok := request.PrivateKey.Public().(*rsa.PublicKey)
if !ok {
return fmt.Errorf("%w: request KeyType not matched with real PrivateKey type", verror.CertificateCheckError)
}
if certPubKey.N.Cmp(reqPubkey.N) != 0 {
return fmt.Errorf("%w: unmatched key modulus", verror.CertificateCheckError)
}
case x509.ECDSA:
certPubkey := cert.PublicKey.(*ecdsa.PublicKey)
reqPubkey, ok := request.PrivateKey.Public().(*ecdsa.PublicKey)
if !ok {
return fmt.Errorf("%w: request KeyType not matched with real PrivateKey type", verror.CertificateCheckError)
}
if certPubkey.X.Cmp(reqPubkey.X) != 0 {
return fmt.Errorf("%w: unmatched X for elliptic keys", verror.CertificateCheckError)
}
default:
return fmt.Errorf("%w: unknown key algorythm %d", verror.CertificateCheckError, cert.PublicKeyAlgorithm)
}
} else if len(request.csr) != 0 {
pemBlock, _ := pem.Decode(request.csr)
if pemBlock == nil {
return fmt.Errorf("%w: bad CSR: %s", verror.CertificateCheckError, string(request.csr))
}
csr, err := x509.ParseCertificateRequest(pemBlock.Bytes)
if err != nil {
return err
}
if cert.PublicKeyAlgorithm != csr.PublicKeyAlgorithm {
return fmt.Errorf("%w: unmatched key type: %s, %s", verror.CertificateCheckError, cert.PublicKeyAlgorithm, csr.PublicKeyAlgorithm)
}
switch csr.PublicKeyAlgorithm {
case x509.RSA:
certPubKey := cert.PublicKey.(*rsa.PublicKey)
reqPubKey := csr.PublicKey.(*rsa.PublicKey)
if certPubKey.N.Cmp(reqPubKey.N) != 0 {
return fmt.Errorf("%w: unmatched key modulus", verror.CertificateCheckError)
}
case x509.ECDSA:
certPubKey := cert.PublicKey.(*ecdsa.PublicKey)
reqPubKey := csr.PublicKey.(*ecdsa.PublicKey)
if certPubKey.X.Cmp(reqPubKey.X) != 0 {
return fmt.Errorf("%w: unmatched X for elliptic keys", verror.CertificateCheckError)
}
}
}
return nil
}
func publicKey(priv crypto.Signer) crypto.PublicKey {
if priv != nil {
return priv.Public()
}
return nil
}
func PublicKey(priv crypto.Signer) crypto.PublicKey {
return publicKey(priv)
}
// GetPrivateKeyPEMBock gets the private key as a PEM data block
func GetPrivateKeyPEMBock(key crypto.Signer) (*pem.Block, error) {
switch k := key.(type) {
case *rsa.PrivateKey:
return &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}, nil
case *ecdsa.PrivateKey:
b, err := x509.MarshalECPrivateKey(k)
if err != nil {
return nil, err
}
return &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}, nil
default:
return nil, fmt.Errorf("%w: unable to format Key", verror.VcertError)
}
}
//nolint
// GetEncryptedPrivateKeyPEMBock gets the private key as an encrypted PEM data block
func GetEncryptedPrivateKeyPEMBock(key crypto.Signer, password []byte) (*pem.Block, error) {
switch k := key.(type) {
case *rsa.PrivateKey:
return x509.EncryptPEMBlock(rand.Reader, "RSA PRIVATE KEY", x509.MarshalPKCS1PrivateKey(k), password, x509.PEMCipherAES256)
case *ecdsa.PrivateKey:
b, err := x509.MarshalECPrivateKey(k)
if err != nil {
return nil, err
}
return x509.EncryptPEMBlock(rand.Reader, "EC PRIVATE KEY", b, password, x509.PEMCipherAES256)
default:
return nil, fmt.Errorf("%w: unable to format Key", verror.VcertError)
}
}
// GetCertificatePEMBlock gets the certificate as a PEM data block
func GetCertificatePEMBlock(cert []byte) *pem.Block {
return &pem.Block{Type: "CERTIFICATE", Bytes: cert}
}
// GetCertificateRequestPEMBlock gets the certificate request as a PEM data block
func GetCertificateRequestPEMBlock(request []byte) *pem.Block {
return &pem.Block{Type: "CERTIFICATE REQUEST", Bytes: request}
}
// GenerateECDSAPrivateKey generates a new ecdsa private key using the curve specified
func GenerateECDSAPrivateKey(curve EllipticCurve) (*ecdsa.PrivateKey, error) {
var priv *ecdsa.PrivateKey
var c elliptic.Curve
var err error
if curve == EllipticCurveNotSet {
curve = EllipticCurveDefault
}
switch curve {
case EllipticCurveP521:
c = elliptic.P521()
case EllipticCurveP384:
c = elliptic.P384()
case EllipticCurveP256:
c = elliptic.P256()
}
priv, err = ecdsa.GenerateKey(c, rand.Reader)
if err != nil {
return nil, err
}
return priv, nil
}
// GenerateRSAPrivateKey generates a new rsa private key using the size specified
func GenerateRSAPrivateKey(size int) (*rsa.PrivateKey, error) {
priv, err := rsa.GenerateKey(rand.Reader, size)
if err != nil {
return nil, err
}
return priv, nil
}
// NewRequest duplicates new Request object based on issued certificate
func NewRequest(cert *x509.Certificate) *Request {
req := &Request{}
// First populate with *cert content
req.Subject = cert.Subject
req.DNSNames = cert.DNSNames
req.EmailAddresses = cert.EmailAddresses
req.IPAddresses = cert.IPAddresses
req.URIs = cert.URIs
req.UPNs, _ = getUserPrincipalNameSANs(cert)
req.SignatureAlgorithm = cert.SignatureAlgorithm
switch pub := cert.PublicKey.(type) {
case *rsa.PublicKey:
req.KeyType = KeyTypeRSA
req.KeyLength = pub.N.BitLen()
case *ecdsa.PublicKey:
req.KeyType = KeyTypeECDSA
req.KeyLength = pub.Curve.Params().BitSize
// TODO: req.KeyCurve = pub.Curve.Params().Name ...
default: // case *dsa.PublicKey
// vcert only works with RSA & ECDSA
}
return req
}