108 lines
2.6 KiB
Go
108 lines
2.6 KiB
Go
package issuance
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import (
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"crypto/rand"
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"crypto/x509"
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"fmt"
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"math/big"
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"time"
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"github.com/zmap/zlint/v3/lint"
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"github.com/letsencrypt/boulder/config"
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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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type CRLProfileConfig struct {
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ValidityInterval config.Duration
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MaxBackdate config.Duration
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}
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type CRLProfile struct {
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validityInterval time.Duration
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maxBackdate time.Duration
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lints lint.Registry
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}
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func NewCRLProfile(config CRLProfileConfig) (*CRLProfile, error) {
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lifetime := config.ValidityInterval.Duration
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if lifetime >= 10*24*time.Hour {
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return nil, fmt.Errorf("crl lifetime cannot be more than 10 days, got %q", lifetime)
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} else if lifetime <= 0*time.Hour {
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return nil, fmt.Errorf("crl lifetime must be positive, got %q", lifetime)
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}
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if config.MaxBackdate.Duration < 0 {
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return nil, fmt.Errorf("crl max backdate must be non-negative, got %q", config.MaxBackdate)
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}
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reg, err := linter.NewRegistry(nil)
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if err != nil {
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return nil, fmt.Errorf("creating lint registry: %w", err)
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}
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return &CRLProfile{
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validityInterval: config.ValidityInterval.Duration,
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maxBackdate: config.MaxBackdate.Duration,
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lints: reg,
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}, nil
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}
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type CRLRequest struct {
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Number *big.Int
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Shard int64
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ThisUpdate time.Time
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Entries []x509.RevocationListEntry
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}
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func (i *Issuer) IssueCRL(prof *CRLProfile, req *CRLRequest) ([]byte, error) {
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backdatedBy := i.clk.Now().Sub(req.ThisUpdate)
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if backdatedBy > prof.maxBackdate {
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return nil, fmt.Errorf("ThisUpdate is too far in the past (%s>%s)", backdatedBy, prof.maxBackdate)
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}
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if backdatedBy < 0 {
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return nil, fmt.Errorf("ThisUpdate is in the future (%s>%s)", req.ThisUpdate, i.clk.Now())
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}
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template := &x509.RevocationList{
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RevokedCertificateEntries: req.Entries,
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Number: req.Number,
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ThisUpdate: req.ThisUpdate,
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NextUpdate: req.ThisUpdate.Add(-time.Second).Add(prof.validityInterval),
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}
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if i.crlURLBase == "" {
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return nil, fmt.Errorf("CRL must contain an issuingDistributionPoint")
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}
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// Concat the base with the shard directly, since we require that the base
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// end with a single trailing slash.
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idp, err := idp.MakeUserCertsExt([]string{
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fmt.Sprintf("%s%d.crl", i.crlURLBase, req.Shard),
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})
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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 = i.Linter.CheckCRL(template, prof.lints)
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if err != nil {
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return nil, err
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}
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crlBytes, err := x509.CreateRevocationList(
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rand.Reader,
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template,
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i.Cert.Certificate,
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i.Signer,
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)
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if err != nil {
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return nil, err
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}
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return crlBytes, nil
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}
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