forked from TrueCloudLab/certificates
172 lines
5.7 KiB
Go
172 lines
5.7 KiB
Go
package authority
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import (
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"crypto/x509"
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"net/http"
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"strings"
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"github.com/pkg/errors"
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"github.com/smallstep/certificates/authority/provisioner"
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"github.com/smallstep/cli/jose"
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)
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// Claims extends jose.Claims with step attributes.
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type Claims struct {
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jose.Claims
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SANs []string `json:"sans,omitempty"`
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Email string `json:"email,omitempty"`
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Nonce string `json:"nonce,omitempty"`
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}
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// authorizeToken parses the token and returns the provisioner used to generate
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// the token. This method enforces the One-Time use policy (tokens can only be
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// used once).
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func (a *Authority) authorizeToken(ott string) (provisioner.Interface, error) {
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var errContext = map[string]interface{}{"ott": ott}
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// Validate payload
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token, err := jose.ParseSigned(ott)
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if err != nil {
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return nil, &apiError{errors.Wrapf(err, "authorizeToken: error parsing token"),
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http.StatusUnauthorized, errContext}
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}
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// Get claims w/out verification. We need to look up the provisioner
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// key in order to verify the claims and we need the issuer from the claims
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// before we can look up the provisioner.
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var claims Claims
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if err = token.UnsafeClaimsWithoutVerification(&claims); err != nil {
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return nil, &apiError{errors.Wrap(err, "authorizeToken"), http.StatusUnauthorized, errContext}
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}
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// TODO: use new persistence layer abstraction.
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// Do not accept tokens issued before the start of the ca.
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// This check is meant as a stopgap solution to the current lack of a persistence layer.
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if a.config.AuthorityConfig != nil && !a.config.AuthorityConfig.DisableIssuedAtCheck {
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if claims.IssuedAt != nil && claims.IssuedAt.Time().Before(a.startTime) {
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return nil, &apiError{errors.New("authorizeToken: token issued before the bootstrap of certificate authority"),
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http.StatusUnauthorized, errContext}
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}
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}
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// This method will also validate the audiences for JWK provisioners.
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p, ok := a.provisioners.LoadByToken(token, &claims.Claims)
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if !ok {
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return nil, &apiError{
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errors.Errorf("authorizeToken: provisioner not found or invalid audience (%s)", strings.Join(claims.Audience, ", ")),
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http.StatusUnauthorized, errContext}
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}
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// Store the token to protect against reuse.
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if reuseKey, err := p.GetTokenID(ott); err == nil {
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ok, err := a.db.UseToken(reuseKey, ott)
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if err != nil {
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return nil, &apiError{errors.Wrap(err, "authorizeToken: failed when checking if token already used"),
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http.StatusInternalServerError, errContext}
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}
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if !ok {
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return nil, &apiError{errors.Errorf("authorizeToken: token already used"), http.StatusUnauthorized, errContext}
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}
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}
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return p, nil
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}
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// Authorize is a passthrough to AuthorizeSign.
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// NOTE: Authorize will be deprecated in a future release. Please use the
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// context specific Authorize[Sign|Revoke|etc.] going forwards.
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func (a *Authority) Authorize(ott string) ([]provisioner.SignOption, error) {
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return a.AuthorizeSign(ott)
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}
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// AuthorizeSign authorizes a signature request by validating and authenticating
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// a OTT that must be sent w/ the request.
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func (a *Authority) AuthorizeSign(ott string) ([]provisioner.SignOption, error) {
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var errContext = context{"ott": ott}
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p, err := a.authorizeToken(ott)
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if err != nil {
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return nil, &apiError{errors.Wrap(err, "authorizeSign"), http.StatusUnauthorized, errContext}
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}
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// Call the provisioner AuthorizeSign method to apply provisioner specific
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// auth claims and get the signing options.
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opts, err := p.AuthorizeSign(ott)
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if err != nil {
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return nil, &apiError{errors.Wrap(err, "authorizeSign"), http.StatusUnauthorized, errContext}
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}
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return opts, nil
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}
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// authorizeRevoke authorizes a revocation request by validating and authenticating
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// the RevokeOptions POSTed with the request.
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// Returns a tuple of the provisioner ID and error, if one occurred.
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func (a *Authority) authorizeRevoke(opts *RevokeOptions) (p provisioner.Interface, err error) {
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if opts.MTLS {
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if opts.Crt.SerialNumber.String() != opts.Serial {
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return nil, errors.New("authorizeRevoke: serial number in certificate different than body")
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}
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// Load the Certificate provisioner if one exists.
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p, err = a.LoadProvisionerByCertificate(opts.Crt)
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if err != nil {
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return nil, errors.Wrap(err, "authorizeRevoke")
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}
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} else {
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// Gets the token provisioner and validates common token fields.
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p, err = a.authorizeToken(opts.OTT)
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if err != nil {
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return nil, errors.Wrap(err, "authorizeRevoke")
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}
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// Call the provisioner AuthorizeRevoke to apply provisioner specific auth claims.
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err = p.AuthorizeRevoke(opts.OTT)
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if err != nil {
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return nil, errors.Wrap(err, "authorizeRevoke")
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}
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}
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return
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}
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// authorizeRenewal tries to locate the step provisioner extension, and checks
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// if for the configured provisioner, the renewal is enabled or not. If the
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// extra extension cannot be found, authorize the renewal by default.
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//
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// TODO(mariano): should we authorize by default?
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func (a *Authority) authorizeRenewal(crt *x509.Certificate) error {
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errContext := map[string]interface{}{"serialNumber": crt.SerialNumber.String()}
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// Check the passive revocation table.
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isRevoked, err := a.db.IsRevoked(crt.SerialNumber.String())
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if err != nil {
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return &apiError{
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err: errors.Wrap(err, "renew"),
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code: http.StatusInternalServerError,
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context: errContext,
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}
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}
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if isRevoked {
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return &apiError{
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err: errors.New("renew: certificate has been revoked"),
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code: http.StatusUnauthorized,
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context: errContext,
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}
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}
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p, ok := a.provisioners.LoadByCertificate(crt)
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if !ok {
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return &apiError{
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err: errors.New("renew: provisioner not found"),
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code: http.StatusUnauthorized,
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context: errContext,
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}
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}
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if err := p.AuthorizeRenewal(crt); err != nil {
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return &apiError{
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err: errors.Wrap(err, "renew"),
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code: http.StatusUnauthorized,
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context: errContext,
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}
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}
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return nil
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}
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