mirror of
https://github.com/smallstep/certificates.git
synced 2024-10-31 03:20:16 +00:00
661 lines
22 KiB
Go
661 lines
22 KiB
Go
package authority
|
|
|
|
import (
|
|
"context"
|
|
"crypto"
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
"crypto/x509/pkix"
|
|
"encoding/asn1"
|
|
"encoding/base64"
|
|
"encoding/pem"
|
|
"math/big"
|
|
"net/http"
|
|
"time"
|
|
|
|
"github.com/pkg/errors"
|
|
"github.com/smallstep/certificates/authority/config"
|
|
"github.com/smallstep/certificates/authority/provisioner"
|
|
casapi "github.com/smallstep/certificates/cas/apiv1"
|
|
"github.com/smallstep/certificates/db"
|
|
"github.com/smallstep/certificates/errs"
|
|
"go.step.sm/crypto/jose"
|
|
"go.step.sm/crypto/keyutil"
|
|
"go.step.sm/crypto/pemutil"
|
|
"go.step.sm/crypto/x509util"
|
|
"golang.org/x/crypto/ssh"
|
|
)
|
|
|
|
// GetTLSOptions returns the tls options configured.
|
|
func (a *Authority) GetTLSOptions() *config.TLSOptions {
|
|
return a.config.TLS
|
|
}
|
|
|
|
var oidAuthorityKeyIdentifier = asn1.ObjectIdentifier{2, 5, 29, 35}
|
|
var oidSubjectKeyIdentifier = asn1.ObjectIdentifier{2, 5, 29, 14}
|
|
|
|
func withDefaultASN1DN(def *config.ASN1DN) provisioner.CertificateModifierFunc {
|
|
return func(crt *x509.Certificate, opts provisioner.SignOptions) error {
|
|
if def == nil {
|
|
return errors.New("default ASN1DN template cannot be nil")
|
|
}
|
|
if len(crt.Subject.Country) == 0 && def.Country != "" {
|
|
crt.Subject.Country = append(crt.Subject.Country, def.Country)
|
|
}
|
|
if len(crt.Subject.Organization) == 0 && def.Organization != "" {
|
|
crt.Subject.Organization = append(crt.Subject.Organization, def.Organization)
|
|
}
|
|
if len(crt.Subject.OrganizationalUnit) == 0 && def.OrganizationalUnit != "" {
|
|
crt.Subject.OrganizationalUnit = append(crt.Subject.OrganizationalUnit, def.OrganizationalUnit)
|
|
}
|
|
if len(crt.Subject.Locality) == 0 && def.Locality != "" {
|
|
crt.Subject.Locality = append(crt.Subject.Locality, def.Locality)
|
|
}
|
|
if len(crt.Subject.Province) == 0 && def.Province != "" {
|
|
crt.Subject.Province = append(crt.Subject.Province, def.Province)
|
|
}
|
|
if len(crt.Subject.StreetAddress) == 0 && def.StreetAddress != "" {
|
|
crt.Subject.StreetAddress = append(crt.Subject.StreetAddress, def.StreetAddress)
|
|
}
|
|
if crt.Subject.SerialNumber == "" && def.SerialNumber != "" {
|
|
crt.Subject.SerialNumber = def.SerialNumber
|
|
}
|
|
if crt.Subject.CommonName == "" && def.CommonName != "" {
|
|
crt.Subject.CommonName = def.CommonName
|
|
}
|
|
return nil
|
|
}
|
|
}
|
|
|
|
// Sign creates a signed certificate from a certificate signing request.
|
|
func (a *Authority) Sign(csr *x509.CertificateRequest, signOpts provisioner.SignOptions, extraOpts ...provisioner.SignOption) ([]*x509.Certificate, error) {
|
|
var (
|
|
certOptions []x509util.Option
|
|
certValidators []provisioner.CertificateValidator
|
|
certModifiers []provisioner.CertificateModifier
|
|
certEnforcers []provisioner.CertificateEnforcer
|
|
)
|
|
|
|
opts := []interface{}{errs.WithKeyVal("csr", csr), errs.WithKeyVal("signOptions", signOpts)}
|
|
if err := csr.CheckSignature(); err != nil {
|
|
return nil, errs.Wrap(http.StatusBadRequest, err, "authority.Sign; invalid certificate request", opts...)
|
|
}
|
|
|
|
// Set backdate with the configured value
|
|
signOpts.Backdate = a.config.AuthorityConfig.Backdate.Duration
|
|
|
|
for _, op := range extraOpts {
|
|
switch k := op.(type) {
|
|
// Adds new options to NewCertificate
|
|
case provisioner.CertificateOptions:
|
|
certOptions = append(certOptions, k.Options(signOpts)...)
|
|
|
|
// Validate the given certificate request.
|
|
case provisioner.CertificateRequestValidator:
|
|
if err := k.Valid(csr); err != nil {
|
|
return nil, errs.Wrap(http.StatusUnauthorized, err, "authority.Sign", opts...)
|
|
}
|
|
|
|
// Validates the unsigned certificate template.
|
|
case provisioner.CertificateValidator:
|
|
certValidators = append(certValidators, k)
|
|
|
|
// Modifies a certificate before validating it.
|
|
case provisioner.CertificateModifier:
|
|
certModifiers = append(certModifiers, k)
|
|
|
|
// Modifies a certificate after validating it.
|
|
case provisioner.CertificateEnforcer:
|
|
certEnforcers = append(certEnforcers, k)
|
|
|
|
default:
|
|
return nil, errs.InternalServer("authority.Sign; invalid extra option type %T", append([]interface{}{k}, opts...)...)
|
|
}
|
|
}
|
|
|
|
cert, err := x509util.NewCertificate(csr, certOptions...)
|
|
if err != nil {
|
|
if _, ok := err.(*x509util.TemplateError); ok {
|
|
return nil, errs.NewErr(http.StatusBadRequest, err,
|
|
errs.WithMessage(err.Error()),
|
|
errs.WithKeyVal("csr", csr),
|
|
errs.WithKeyVal("signOptions", signOpts),
|
|
)
|
|
}
|
|
return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.Sign", opts...)
|
|
}
|
|
|
|
// Certificate modifiers before validation
|
|
leaf := cert.GetCertificate()
|
|
|
|
// Set default subject
|
|
if err := withDefaultASN1DN(a.config.AuthorityConfig.Template).Modify(leaf, signOpts); err != nil {
|
|
return nil, errs.Wrap(http.StatusUnauthorized, err, "authority.Sign", opts...)
|
|
}
|
|
|
|
for _, m := range certModifiers {
|
|
if err := m.Modify(leaf, signOpts); err != nil {
|
|
return nil, errs.Wrap(http.StatusUnauthorized, err, "authority.Sign", opts...)
|
|
}
|
|
}
|
|
|
|
// Certificate validation.
|
|
for _, v := range certValidators {
|
|
if err := v.Valid(leaf, signOpts); err != nil {
|
|
return nil, errs.Wrap(http.StatusUnauthorized, err, "authority.Sign", opts...)
|
|
}
|
|
}
|
|
|
|
// Certificate modifiers after validation
|
|
for _, m := range certEnforcers {
|
|
if err := m.Enforce(leaf); err != nil {
|
|
return nil, errs.Wrap(http.StatusUnauthorized, err, "authority.Sign", opts...)
|
|
}
|
|
}
|
|
|
|
lifetime := leaf.NotAfter.Sub(leaf.NotBefore.Add(signOpts.Backdate))
|
|
resp, err := a.x509CAService.CreateCertificate(&casapi.CreateCertificateRequest{
|
|
Template: leaf,
|
|
CSR: csr,
|
|
Lifetime: lifetime,
|
|
Backdate: signOpts.Backdate,
|
|
})
|
|
if err != nil {
|
|
return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.Sign; error creating certificate", opts...)
|
|
}
|
|
|
|
fullchain := append([]*x509.Certificate{resp.Certificate}, resp.CertificateChain...)
|
|
if err = a.storeCertificate(fullchain); err != nil {
|
|
if err != db.ErrNotImplemented {
|
|
return nil, errs.Wrap(http.StatusInternalServerError, err,
|
|
"authority.Sign; error storing certificate in db", opts...)
|
|
}
|
|
}
|
|
|
|
return fullchain, nil
|
|
}
|
|
|
|
// Renew creates a new Certificate identical to the old certificate, except
|
|
// with a validity window that begins 'now'.
|
|
func (a *Authority) Renew(oldCert *x509.Certificate) ([]*x509.Certificate, error) {
|
|
return a.Rekey(oldCert, nil)
|
|
}
|
|
|
|
// Rekey is used for rekeying and renewing based on the public key.
|
|
// If the public key is 'nil' then it's assumed that the cert should be renewed
|
|
// using the existing public key. If the public key is not 'nil' then it's
|
|
// assumed that the cert should be rekeyed.
|
|
// For both Rekey and Renew all other attributes of the new certificate should
|
|
// match the old certificate. The exceptions are 'AuthorityKeyId' (which may
|
|
// have changed), 'SubjectKeyId' (different in case of rekey), and
|
|
// 'NotBefore/NotAfter' (the validity duration of the new certificate should be
|
|
// equal to the old one, but starting 'now').
|
|
func (a *Authority) Rekey(oldCert *x509.Certificate, pk crypto.PublicKey) ([]*x509.Certificate, error) {
|
|
isRekey := (pk != nil)
|
|
opts := []interface{}{errs.WithKeyVal("serialNumber", oldCert.SerialNumber.String())}
|
|
|
|
// Check step provisioner extensions
|
|
if err := a.authorizeRenew(oldCert); err != nil {
|
|
return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.Rekey", opts...)
|
|
}
|
|
|
|
// Durations
|
|
backdate := a.config.AuthorityConfig.Backdate.Duration
|
|
duration := oldCert.NotAfter.Sub(oldCert.NotBefore)
|
|
lifetime := duration - backdate
|
|
|
|
// Create new certificate from previous values.
|
|
// Issuer, NotBefore, NotAfter and SubjectKeyId will be set by the CAS.
|
|
newCert := &x509.Certificate{
|
|
Subject: oldCert.Subject,
|
|
KeyUsage: oldCert.KeyUsage,
|
|
UnhandledCriticalExtensions: oldCert.UnhandledCriticalExtensions,
|
|
ExtKeyUsage: oldCert.ExtKeyUsage,
|
|
UnknownExtKeyUsage: oldCert.UnknownExtKeyUsage,
|
|
BasicConstraintsValid: oldCert.BasicConstraintsValid,
|
|
IsCA: oldCert.IsCA,
|
|
MaxPathLen: oldCert.MaxPathLen,
|
|
MaxPathLenZero: oldCert.MaxPathLenZero,
|
|
OCSPServer: oldCert.OCSPServer,
|
|
IssuingCertificateURL: oldCert.IssuingCertificateURL,
|
|
PermittedDNSDomainsCritical: oldCert.PermittedDNSDomainsCritical,
|
|
PermittedEmailAddresses: oldCert.PermittedEmailAddresses,
|
|
DNSNames: oldCert.DNSNames,
|
|
EmailAddresses: oldCert.EmailAddresses,
|
|
IPAddresses: oldCert.IPAddresses,
|
|
URIs: oldCert.URIs,
|
|
PermittedDNSDomains: oldCert.PermittedDNSDomains,
|
|
ExcludedDNSDomains: oldCert.ExcludedDNSDomains,
|
|
PermittedIPRanges: oldCert.PermittedIPRanges,
|
|
ExcludedIPRanges: oldCert.ExcludedIPRanges,
|
|
ExcludedEmailAddresses: oldCert.ExcludedEmailAddresses,
|
|
PermittedURIDomains: oldCert.PermittedURIDomains,
|
|
ExcludedURIDomains: oldCert.ExcludedURIDomains,
|
|
CRLDistributionPoints: oldCert.CRLDistributionPoints,
|
|
PolicyIdentifiers: oldCert.PolicyIdentifiers,
|
|
}
|
|
|
|
if isRekey {
|
|
newCert.PublicKey = pk
|
|
} else {
|
|
newCert.PublicKey = oldCert.PublicKey
|
|
}
|
|
|
|
// Copy all extensions except:
|
|
//
|
|
// 1. Authority Key Identifier - This one might be different if we rotate
|
|
// the intermediate certificate and it will cause a TLS bad certificate
|
|
// error.
|
|
//
|
|
// 2. Subject Key Identifier, if rekey - For rekey, SubjectKeyIdentifier
|
|
// extension will be calculated for the new public key by
|
|
// x509util.CreateCertificate()
|
|
for _, ext := range oldCert.Extensions {
|
|
if ext.Id.Equal(oidAuthorityKeyIdentifier) {
|
|
continue
|
|
}
|
|
if ext.Id.Equal(oidSubjectKeyIdentifier) && isRekey {
|
|
newCert.SubjectKeyId = nil
|
|
continue
|
|
}
|
|
newCert.ExtraExtensions = append(newCert.ExtraExtensions, ext)
|
|
}
|
|
|
|
resp, err := a.x509CAService.RenewCertificate(&casapi.RenewCertificateRequest{
|
|
Template: newCert,
|
|
Lifetime: lifetime,
|
|
Backdate: backdate,
|
|
})
|
|
if err != nil {
|
|
return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.Rekey", opts...)
|
|
}
|
|
|
|
fullchain := append([]*x509.Certificate{resp.Certificate}, resp.CertificateChain...)
|
|
if err = a.storeRenewedCertificate(oldCert, fullchain); err != nil {
|
|
if err != db.ErrNotImplemented {
|
|
return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.Rekey; error storing certificate in db", opts...)
|
|
}
|
|
}
|
|
|
|
return fullchain, nil
|
|
}
|
|
|
|
// storeCertificate allows to use an extension of the db.AuthDB interface that
|
|
// can log the full chain of certificates.
|
|
//
|
|
// TODO: at some point we should replace the db.AuthDB interface to implement
|
|
// `StoreCertificate(...*x509.Certificate) error` instead of just
|
|
// `StoreCertificate(*x509.Certificate) error`.
|
|
func (a *Authority) storeCertificate(fullchain []*x509.Certificate) error {
|
|
type certificateChainStorer interface {
|
|
StoreCertificateChain(...*x509.Certificate) error
|
|
}
|
|
// Store certificate in linkedca
|
|
if s, ok := a.adminDB.(certificateChainStorer); ok {
|
|
return s.StoreCertificateChain(fullchain...)
|
|
}
|
|
// Store certificate in local db
|
|
if s, ok := a.db.(certificateChainStorer); ok {
|
|
return s.StoreCertificateChain(fullchain...)
|
|
}
|
|
return a.db.StoreCertificate(fullchain[0])
|
|
}
|
|
|
|
// storeRenewedCertificate allows to use an extension of the db.AuthDB interface
|
|
// that can log if a certificate has been renewed or rekeyed.
|
|
//
|
|
// TODO: at some point we should implement this in the standard implementation.
|
|
func (a *Authority) storeRenewedCertificate(oldCert *x509.Certificate, fullchain []*x509.Certificate) error {
|
|
type renewedCertificateChainStorer interface {
|
|
StoreRenewedCertificate(*x509.Certificate, ...*x509.Certificate) error
|
|
}
|
|
// Store certificate in linkedca
|
|
if s, ok := a.adminDB.(renewedCertificateChainStorer); ok {
|
|
return s.StoreRenewedCertificate(oldCert, fullchain...)
|
|
}
|
|
// Store certificate in local db
|
|
if s, ok := a.db.(renewedCertificateChainStorer); ok {
|
|
return s.StoreRenewedCertificate(oldCert, fullchain...)
|
|
}
|
|
return a.db.StoreCertificate(fullchain[0])
|
|
}
|
|
|
|
// RevokeOptions are the options for the Revoke API.
|
|
type RevokeOptions struct {
|
|
Serial string
|
|
Reason string
|
|
ReasonCode int
|
|
PassiveOnly bool
|
|
MTLS bool
|
|
Crt *x509.Certificate
|
|
OTT string
|
|
}
|
|
|
|
// Revoke revokes a certificate.
|
|
//
|
|
// NOTE: Only supports passive revocation - prevent existing certificates from
|
|
// being renewed.
|
|
//
|
|
// TODO: Add OCSP and CRL support.
|
|
func (a *Authority) Revoke(ctx context.Context, revokeOpts *RevokeOptions) error {
|
|
opts := []interface{}{
|
|
errs.WithKeyVal("serialNumber", revokeOpts.Serial),
|
|
errs.WithKeyVal("reasonCode", revokeOpts.ReasonCode),
|
|
errs.WithKeyVal("reason", revokeOpts.Reason),
|
|
errs.WithKeyVal("passiveOnly", revokeOpts.PassiveOnly),
|
|
errs.WithKeyVal("MTLS", revokeOpts.MTLS),
|
|
errs.WithKeyVal("context", provisioner.MethodFromContext(ctx).String()),
|
|
}
|
|
if revokeOpts.MTLS {
|
|
opts = append(opts, errs.WithKeyVal("certificate", base64.StdEncoding.EncodeToString(revokeOpts.Crt.Raw)))
|
|
} else {
|
|
opts = append(opts, errs.WithKeyVal("token", revokeOpts.OTT))
|
|
}
|
|
|
|
rci := &db.RevokedCertificateInfo{
|
|
Serial: revokeOpts.Serial,
|
|
ReasonCode: revokeOpts.ReasonCode,
|
|
Reason: revokeOpts.Reason,
|
|
MTLS: revokeOpts.MTLS,
|
|
RevokedAt: time.Now().UTC(),
|
|
}
|
|
|
|
var (
|
|
p provisioner.Interface
|
|
err error
|
|
)
|
|
|
|
if revokeOpts.Crt == nil {
|
|
// Attempt to get the certificate expiry using the serial number.
|
|
cert, err := a.db.GetCertificate(revokeOpts.Serial)
|
|
|
|
// Revocation of a certificate not in the database may be requested, so fill in the expiry only
|
|
// if we can
|
|
if err == nil {
|
|
rci.ExpiresAt = cert.NotAfter
|
|
}
|
|
}
|
|
|
|
// If not mTLS then get the TokenID of the token.
|
|
if !revokeOpts.MTLS {
|
|
token, err := jose.ParseSigned(revokeOpts.OTT)
|
|
if err != nil {
|
|
return errs.Wrap(http.StatusUnauthorized, err,
|
|
"authority.Revoke; error parsing token", opts...)
|
|
}
|
|
|
|
// Get claims w/out verification.
|
|
var claims Claims
|
|
if err = token.UnsafeClaimsWithoutVerification(&claims); err != nil {
|
|
return errs.Wrap(http.StatusUnauthorized, err, "authority.Revoke", opts...)
|
|
}
|
|
|
|
// This method will also validate the audiences for JWK provisioners.
|
|
p, err = a.LoadProvisionerByToken(token, &claims.Claims)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
rci.ProvisionerID = p.GetID()
|
|
rci.TokenID, err = p.GetTokenID(revokeOpts.OTT)
|
|
if err != nil && !errors.Is(err, provisioner.ErrAllowTokenReuse) {
|
|
return errs.Wrap(http.StatusInternalServerError, err,
|
|
"authority.Revoke; could not get ID for token")
|
|
}
|
|
opts = append(opts,
|
|
errs.WithKeyVal("provisionerID", rci.ProvisionerID),
|
|
errs.WithKeyVal("tokenID", rci.TokenID),
|
|
)
|
|
} else if p, err = a.LoadProvisionerByCertificate(revokeOpts.Crt); err == nil {
|
|
// Load the Certificate provisioner if one exists.
|
|
rci.ProvisionerID = p.GetID()
|
|
opts = append(opts, errs.WithKeyVal("provisionerID", rci.ProvisionerID))
|
|
}
|
|
|
|
if provisioner.MethodFromContext(ctx) == provisioner.SSHRevokeMethod {
|
|
err = a.revokeSSH(nil, rci)
|
|
} else {
|
|
// Revoke an X.509 certificate using CAS. If the certificate is not
|
|
// provided we will try to read it from the db. If the read fails we
|
|
// won't throw an error as it will be responsibility of the CAS
|
|
// implementation to require a certificate.
|
|
var revokedCert *x509.Certificate
|
|
if revokeOpts.Crt != nil {
|
|
revokedCert = revokeOpts.Crt
|
|
} else if rci.Serial != "" {
|
|
revokedCert, _ = a.db.GetCertificate(rci.Serial)
|
|
}
|
|
|
|
// CAS operation, note that SoftCAS (default) is a noop.
|
|
// The revoke happens when this is stored in the db.
|
|
_, err = a.x509CAService.RevokeCertificate(&casapi.RevokeCertificateRequest{
|
|
Certificate: revokedCert,
|
|
SerialNumber: rci.Serial,
|
|
Reason: rci.Reason,
|
|
ReasonCode: rci.ReasonCode,
|
|
PassiveOnly: revokeOpts.PassiveOnly,
|
|
})
|
|
if err != nil {
|
|
return errs.Wrap(http.StatusInternalServerError, err, "authority.Revoke", opts...)
|
|
}
|
|
|
|
// Save as revoked in the Db.
|
|
err = a.revoke(revokedCert, rci)
|
|
|
|
// Generate a new CRL so CRL requesters will always get an up-to-date CRL whenever they request it
|
|
err = a.GenerateCertificateRevocationList()
|
|
if err != nil {
|
|
return errs.Wrap(http.StatusInternalServerError, err, "authority.Revoke", opts...)
|
|
}
|
|
}
|
|
switch err {
|
|
case nil:
|
|
return nil
|
|
case db.ErrNotImplemented:
|
|
return errs.NotImplemented("authority.Revoke; no persistence layer configured", opts...)
|
|
case db.ErrAlreadyExists:
|
|
return errs.BadRequest("authority.Revoke; certificate with serial "+
|
|
"number %s has already been revoked", append([]interface{}{rci.Serial}, opts...)...)
|
|
default:
|
|
return errs.Wrap(http.StatusInternalServerError, err, "authority.Revoke", opts...)
|
|
}
|
|
}
|
|
|
|
func (a *Authority) revoke(crt *x509.Certificate, rci *db.RevokedCertificateInfo) error {
|
|
if lca, ok := a.adminDB.(interface {
|
|
Revoke(*x509.Certificate, *db.RevokedCertificateInfo) error
|
|
}); ok {
|
|
return lca.Revoke(crt, rci)
|
|
}
|
|
return a.db.Revoke(rci)
|
|
}
|
|
|
|
func (a *Authority) revokeSSH(crt *ssh.Certificate, rci *db.RevokedCertificateInfo) error {
|
|
if lca, ok := a.adminDB.(interface {
|
|
RevokeSSH(*ssh.Certificate, *db.RevokedCertificateInfo) error
|
|
}); ok {
|
|
return lca.RevokeSSH(crt, rci)
|
|
}
|
|
return a.db.Revoke(rci)
|
|
}
|
|
|
|
// GetCertificateRevocationList will return the currently generated CRL from the DB, or a not implemented
|
|
// error if the underlying AuthDB does not support CRLs
|
|
func (a *Authority) GetCertificateRevocationList() ([]byte, error) {
|
|
if a.config.CRL == nil {
|
|
return nil, errs.Wrap(http.StatusNotFound, errors.Errorf("Certificate Revocation Lists are not enabled"), "authority.GetCertificateRevocationList")
|
|
}
|
|
|
|
crlDB, ok := a.db.(db.CertificateRevocationListDB)
|
|
if !ok {
|
|
return nil, errs.Wrap(http.StatusNotImplemented, errors.Errorf("Database does not support Certificate Revocation Lists"), "authority.GetCertificateRevocationList")
|
|
}
|
|
|
|
crlInfo, err := crlDB.GetCRL()
|
|
if err != nil {
|
|
return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.GetCertificateRevocationList")
|
|
|
|
}
|
|
|
|
if crlInfo == nil {
|
|
return nil, nil
|
|
}
|
|
|
|
return crlInfo.DER, nil
|
|
}
|
|
|
|
// GenerateCertificateRevocationList generates a DER representation of a signed CRL and stores it in the
|
|
// database. Returns nil if CRL generation has been disabled in the config
|
|
func (a *Authority) GenerateCertificateRevocationList() error {
|
|
|
|
if a.config.CRL == nil {
|
|
// CRL is disabled
|
|
return nil
|
|
}
|
|
|
|
crlDB, ok := a.db.(db.CertificateRevocationListDB)
|
|
if !ok {
|
|
return errors.Errorf("Database does not support CRL generation")
|
|
}
|
|
|
|
// some CAS may not implement the CRLGenerator interface, so check before we proceed
|
|
caCRLGenerator, ok := a.x509CAService.(casapi.CertificateAuthorityCRLGenerator)
|
|
if !ok {
|
|
return errors.Errorf("CA does not support CRL Generation")
|
|
}
|
|
|
|
crlInfo, err := crlDB.GetCRL()
|
|
if err != nil {
|
|
return errors.Wrap(err, "could not retrieve CRL from database")
|
|
}
|
|
|
|
revokedList, err := crlDB.GetRevokedCertificates()
|
|
if err != nil {
|
|
return errors.Wrap(err, "could not retrieve revoked certificates list from database")
|
|
}
|
|
|
|
// Number is a monotonically increasing integer (essentially the CRL version number) that we need to
|
|
// keep track of and increase every time we generate a new CRL
|
|
var n int64
|
|
var bn big.Int
|
|
|
|
if crlInfo != nil {
|
|
n = crlInfo.Number + 1
|
|
}
|
|
bn.SetInt64(n)
|
|
|
|
// Convert our database db.RevokedCertificateInfo types into the pkix representation ready for the
|
|
// CAS to sign it
|
|
var revokedCertificates []pkix.RevokedCertificate
|
|
|
|
for _, revokedCert := range *revokedList {
|
|
var sn big.Int
|
|
sn.SetString(revokedCert.Serial, 10)
|
|
revokedCertificates = append(revokedCertificates, pkix.RevokedCertificate{
|
|
SerialNumber: &sn,
|
|
RevocationTime: revokedCert.RevokedAt,
|
|
Extensions: nil,
|
|
})
|
|
}
|
|
|
|
// Create a RevocationList representation ready for the CAS to sign
|
|
// TODO: allow SignatureAlgorithm to be specified?
|
|
revocationList := x509.RevocationList{
|
|
SignatureAlgorithm: 0,
|
|
RevokedCertificates: revokedCertificates,
|
|
Number: &bn,
|
|
ThisUpdate: time.Now().UTC(),
|
|
NextUpdate: time.Now().UTC().Add(a.config.CRL.CacheDuration.Duration),
|
|
ExtraExtensions: nil,
|
|
}
|
|
|
|
certificateRevocationList, err := caCRLGenerator.CreateCRL(&casapi.CreateCRLRequest{RevocationList: &revocationList})
|
|
if err != nil {
|
|
return errors.Wrap(err, "could not create CRL")
|
|
}
|
|
|
|
// Create a new db.CertificateRevocationListInfo, which stores the new Number we just generated, the
|
|
// expiry time, and the DER-encoded CRL
|
|
newCRLInfo := db.CertificateRevocationListInfo{
|
|
Number: n,
|
|
ExpiresAt: revocationList.NextUpdate,
|
|
DER: certificateRevocationList.CRL,
|
|
}
|
|
|
|
// Store the CRL in the database ready for retrieval by api endpoints
|
|
err = crlDB.StoreCRL(&newCRLInfo)
|
|
if err != nil {
|
|
return errors.Wrap(err, "could not store CRL in database")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// GetTLSCertificate creates a new leaf certificate to be used by the CA HTTPS server.
|
|
func (a *Authority) GetTLSCertificate() (*tls.Certificate, error) {
|
|
fatal := func(err error) (*tls.Certificate, error) {
|
|
return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.GetTLSCertificate")
|
|
}
|
|
|
|
// Generate default key.
|
|
priv, err := keyutil.GenerateDefaultKey()
|
|
if err != nil {
|
|
return fatal(err)
|
|
}
|
|
signer, ok := priv.(crypto.Signer)
|
|
if !ok {
|
|
return fatal(errors.New("private key is not a crypto.Signer"))
|
|
}
|
|
|
|
// Create initial certificate request.
|
|
cr, err := x509util.CreateCertificateRequest("Step Online CA", a.config.DNSNames, signer)
|
|
if err != nil {
|
|
return fatal(err)
|
|
}
|
|
|
|
// Generate certificate template directly from the certificate request.
|
|
template, err := x509util.NewCertificate(cr)
|
|
if err != nil {
|
|
return fatal(err)
|
|
}
|
|
|
|
// Get x509 certificate template, set validity and sign it.
|
|
now := time.Now()
|
|
certTpl := template.GetCertificate()
|
|
certTpl.NotBefore = now.Add(-1 * time.Minute)
|
|
certTpl.NotAfter = now.Add(24 * time.Hour)
|
|
|
|
resp, err := a.x509CAService.CreateCertificate(&casapi.CreateCertificateRequest{
|
|
Template: certTpl,
|
|
CSR: cr,
|
|
Lifetime: 24 * time.Hour,
|
|
Backdate: 1 * time.Minute,
|
|
})
|
|
if err != nil {
|
|
return fatal(err)
|
|
}
|
|
|
|
// Generate PEM blocks to create tls.Certificate
|
|
pemBlocks := pem.EncodeToMemory(&pem.Block{
|
|
Type: "CERTIFICATE",
|
|
Bytes: resp.Certificate.Raw,
|
|
})
|
|
for _, crt := range resp.CertificateChain {
|
|
pemBlocks = append(pemBlocks, pem.EncodeToMemory(&pem.Block{
|
|
Type: "CERTIFICATE",
|
|
Bytes: crt.Raw,
|
|
})...)
|
|
}
|
|
keyPEM, err := pemutil.Serialize(priv)
|
|
if err != nil {
|
|
return fatal(err)
|
|
}
|
|
|
|
tlsCrt, err := tls.X509KeyPair(pemBlocks, pem.EncodeToMemory(keyPEM))
|
|
if err != nil {
|
|
return fatal(err)
|
|
}
|
|
// Set leaf certificate
|
|
tlsCrt.Leaf = resp.Certificate
|
|
return &tlsCrt, nil
|
|
}
|