certificates/authority/provisioner/acme.go

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package provisioner
import (
"context"
"crypto/x509"
"time"
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"github.com/pkg/errors"
"github.com/smallstep/certificates/errs"
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)
// ACME is the acme provisioner type, an entity that can authorize the ACME
// provisioning flow.
type ACME struct {
*base
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ID string `json:"-"`
Type string `json:"type"`
Name string `json:"name"`
ForceCN bool `json:"forceCN,omitempty"`
Claims *Claims `json:"claims,omitempty"`
Options *Options `json:"options,omitempty"`
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claimer *Claimer
}
// GetID returns the provisioner unique identifier.
func (p ACME) GetID() string {
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if p.ID != "" {
return p.ID
}
return p.GetIDForToken()
}
// GetIDForToken returns an identifier that will be used to load the provisioner
// from a token.
func (p *ACME) GetIDForToken() string {
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return "acme/" + p.Name
}
// GetTokenID returns the identifier of the token.
func (p *ACME) GetTokenID(ott string) (string, error) {
return "", errors.New("acme provisioner does not implement GetTokenID")
}
// GetName returns the name of the provisioner.
func (p *ACME) GetName() string {
return p.Name
}
// GetType returns the type of provisioner.
func (p *ACME) GetType() Type {
return TypeACME
}
// GetEncryptedKey returns the base provisioner encrypted key if it's defined.
func (p *ACME) GetEncryptedKey() (string, string, bool) {
return "", "", false
}
// GetOptions returns the configured provisioner options.
func (p *ACME) GetOptions() *Options {
return p.Options
}
// DefaultTLSCertDuration returns the default TLS cert duration enforced by
// the provisioner.
func (p *ACME) DefaultTLSCertDuration() time.Duration {
return p.claimer.DefaultTLSCertDuration()
}
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// Init initializes and validates the fields of a JWK type.
func (p *ACME) Init(config Config) (err error) {
switch {
case p.Type == "":
return errors.New("provisioner type cannot be empty")
case p.Name == "":
return errors.New("provisioner name cannot be empty")
}
// Update claims with global ones
if p.claimer, err = NewClaimer(p.Claims, config.Claims); err != nil {
return err
}
return err
}
// AuthorizeSign does not do any validation, because all validation is handled
// in the ACME protocol. This method returns a list of modifiers / constraints
// on the resulting certificate.
func (p *ACME) AuthorizeSign(ctx context.Context, token string) ([]SignOption, error) {
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return []SignOption{
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// modifiers / withOptions
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newProvisionerExtensionOption(TypeACME, p.Name, ""),
newForceCNOption(p.ForceCN),
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profileDefaultDuration(p.claimer.DefaultTLSCertDuration()),
// validators
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defaultPublicKeyValidator{},
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newValidityValidator(p.claimer.MinTLSCertDuration(), p.claimer.MaxTLSCertDuration()),
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}, nil
}
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// AuthorizeRevoke is called just before the certificate is to be revoked by
// the CA. It can be used to authorize revocation of a certificate. It
// currently is a no-op.
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// TODO(hs): add configuration option that toggles revocation? Or change function signature to make it more useful?
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// Or move certain logic out of the Revoke API to here? Would likely involve some more stuff in the ctx.
func (p *ACME) AuthorizeRevoke(ctx context.Context, token string) error {
return nil
}
// AuthorizeRenew returns an error if the renewal is disabled.
// NOTE: This method does not actually validate the certificate or check it's
// revocation status. Just confirms that the provisioner that created the
// certificate was configured to allow renewals.
func (p *ACME) AuthorizeRenew(ctx context.Context, cert *x509.Certificate) error {
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if p.claimer.IsDisableRenewal() {
return errs.Unauthorized("acme.AuthorizeRenew; renew is disabled for acme provisioner '%s'", p.GetName())
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}
return nil
}