156 lines
5 KiB
Go
156 lines
5 KiB
Go
package provisioner
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import (
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"context"
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"time"
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"github.com/pkg/errors"
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)
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// SCEP is the SCEP provisioner type, an entity that can authorize the
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// SCEP provisioning flow
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type SCEP struct {
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*base
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ID string `json:"-"`
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Type string `json:"type"`
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Name string `json:"name"`
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ForceCN bool `json:"forceCN,omitempty"`
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ChallengePassword string `json:"challenge,omitempty"`
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Capabilities []string `json:"capabilities,omitempty"`
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// IncludeRoot makes the provisioner return the CA root in addition to the
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// intermediate in the GetCACerts response
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IncludeRoot bool `json:"includeRoot,omitempty"`
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// MinimumPublicKeyLength is the minimum length for public keys in CSRs
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MinimumPublicKeyLength int `json:"minimumPublicKeyLength,omitempty"`
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// Numerical identifier for the ContentEncryptionAlgorithm as defined in github.com/mozilla-services/pkcs7
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// at https://github.com/mozilla-services/pkcs7/blob/33d05740a3526e382af6395d3513e73d4e66d1cb/encrypt.go#L63
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// Defaults to 0, being DES-CBC
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EncryptionAlgorithmIdentifier int `json:"encryptionAlgorithmIdentifier,omitempty"`
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Options *Options `json:"options,omitempty"`
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Claims *Claims `json:"claims,omitempty"`
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ctl *Controller
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secretChallengePassword string
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encryptionAlgorithm int
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}
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// GetID returns the provisioner unique identifier.
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func (s *SCEP) GetID() string {
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if s.ID != "" {
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return s.ID
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}
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return s.GetIDForToken()
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}
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// GetIDForToken returns an identifier that will be used to load the provisioner
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// from a token.
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func (s *SCEP) GetIDForToken() string {
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return "scep/" + s.Name
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}
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// GetName returns the name of the provisioner.
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func (s *SCEP) GetName() string {
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return s.Name
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}
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// GetType returns the type of provisioner.
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func (s *SCEP) GetType() Type {
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return TypeSCEP
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}
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// GetEncryptedKey returns the base provisioner encrypted key if it's defined.
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func (s *SCEP) GetEncryptedKey() (string, string, bool) {
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return "", "", false
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}
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// GetTokenID returns the identifier of the token.
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func (s *SCEP) GetTokenID(ott string) (string, error) {
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return "", errors.New("scep provisioner does not implement GetTokenID")
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}
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// GetOptions returns the configured provisioner options.
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func (s *SCEP) GetOptions() *Options {
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return s.Options
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}
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// DefaultTLSCertDuration returns the default TLS cert duration enforced by
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// the provisioner.
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func (s *SCEP) DefaultTLSCertDuration() time.Duration {
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return s.ctl.Claimer.DefaultTLSCertDuration()
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}
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// Init initializes and validates the fields of a SCEP type.
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func (s *SCEP) Init(config Config) (err error) {
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switch {
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case s.Type == "":
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return errors.New("provisioner type cannot be empty")
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case s.Name == "":
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return errors.New("provisioner name cannot be empty")
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}
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// Mask the actual challenge value, so it won't be marshaled
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s.secretChallengePassword = s.ChallengePassword
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s.ChallengePassword = "*** redacted ***"
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// Default to 2048 bits minimum public key length (for CSRs) if not set
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if s.MinimumPublicKeyLength == 0 {
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s.MinimumPublicKeyLength = 2048
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}
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if s.MinimumPublicKeyLength%8 != 0 {
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return errors.Errorf("%d bits is not exactly divisible by 8", s.MinimumPublicKeyLength)
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}
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s.encryptionAlgorithm = s.EncryptionAlgorithmIdentifier // TODO(hs): we might want to upgrade the default security to AES-CBC?
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if s.encryptionAlgorithm < 0 || s.encryptionAlgorithm > 4 {
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return errors.New("only encryption algorithm identifiers from 0 to 4 are valid")
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}
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// TODO: add other, SCEP specific, options?
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s.ctl, err = NewController(s, s.Claims, config, s.Options)
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return
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}
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// AuthorizeSign does not do any verification, because all verification is handled
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// in the SCEP protocol. This method returns a list of modifiers / constraints
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// on the resulting certificate.
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func (s *SCEP) AuthorizeSign(ctx context.Context, token string) ([]SignOption, error) {
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return []SignOption{
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s,
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// modifiers / withOptions
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newProvisionerExtensionOption(TypeSCEP, s.Name, ""),
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newForceCNOption(s.ForceCN),
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profileDefaultDuration(s.ctl.Claimer.DefaultTLSCertDuration()),
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// validators
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newPublicKeyMinimumLengthValidator(s.MinimumPublicKeyLength),
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newValidityValidator(s.ctl.Claimer.MinTLSCertDuration(), s.ctl.Claimer.MaxTLSCertDuration()),
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newX509NamePolicyValidator(s.ctl.GetPolicy().GetX509()),
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}, nil
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}
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// GetChallengePassword returns the challenge password
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func (s *SCEP) GetChallengePassword() string {
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return s.secretChallengePassword
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}
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// GetCapabilities returns the CA capabilities
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func (s *SCEP) GetCapabilities() []string {
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return s.Capabilities
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}
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// ShouldIncludeRootInChain indicates if the CA should
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// return its intermediate, which is currently used for
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// both signing and decryption, as well as the root in
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// its chain.
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func (s *SCEP) ShouldIncludeRootInChain() bool {
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return s.IncludeRoot
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}
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// GetContentEncryptionAlgorithm returns the numeric identifier
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// for the pkcs7 package encryption algorithm to use.
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func (s *SCEP) GetContentEncryptionAlgorithm() int {
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return s.encryptionAlgorithm
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}
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