62 lines
2.1 KiB
Go
62 lines
2.1 KiB
Go
package main
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import (
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"crypto"
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"crypto/x509"
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"encoding/pem"
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"errors"
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"fmt"
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"math/big"
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"time"
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"github.com/letsencrypt/boulder/crl/idp"
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"github.com/letsencrypt/boulder/linter"
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)
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func generateCRL(signer crypto.Signer, issuer *x509.Certificate, thisUpdate, nextUpdate time.Time, number int64, revokedCertificates []x509.RevocationListEntry) ([]byte, error) {
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template := &x509.RevocationList{
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RevokedCertificateEntries: revokedCertificates,
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Number: big.NewInt(number),
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ThisUpdate: thisUpdate,
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NextUpdate: nextUpdate,
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}
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if nextUpdate.Before(thisUpdate) {
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return nil, errors.New("thisUpdate must be before nextUpdate")
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}
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if thisUpdate.Before(issuer.NotBefore) {
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return nil, errors.New("thisUpdate is before issuing certificate's notBefore")
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} else if nextUpdate.After(issuer.NotAfter) {
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return nil, errors.New("nextUpdate is after issuing certificate's notAfter")
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}
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// Verify that the CRL is not valid for more than 12 months as specified in
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// CABF BRs Section 4.9.7
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if nextUpdate.Sub(thisUpdate) > time.Hour*24*365 {
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return nil, errors.New("nextUpdate must be less than 12 months after thisUpdate")
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}
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// Add the Issuing Distribution Point extension.
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idp, err := idp.MakeCACertsExt()
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if err != nil {
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return nil, fmt.Errorf("creating IDP extension: %w", err)
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}
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template.ExtraExtensions = append(template.ExtraExtensions, *idp)
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err = linter.CheckCRL(template, issuer, signer, []string{})
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if err != nil {
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return nil, fmt.Errorf("crl failed pre-issuance lint: %w", err)
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}
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// x509.CreateRevocationList uses an io.Reader here for signing methods that require
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// a source of randomness. Since PKCS#11 based signing generates needed randomness
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// at the HSM we don't need to pass a real reader. Instead of passing a nil reader
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// we use one that always returns errors in case the internal usage of this reader
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// changes.
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crlBytes, err := x509.CreateRevocationList(&failReader{}, template, issuer, signer)
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if err != nil {
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return nil, err
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}
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return pem.EncodeToMemory(&pem.Block{Type: "X509 CRL", Bytes: crlBytes}), nil
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}
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