package authority import ( "crypto/x509" "net/http" "net/url" "time" "github.com/pkg/errors" "github.com/smallstep/certificates/authority/provisioner" "github.com/smallstep/cli/jose" ) type idUsed struct { UsedAt int64 `json:"ua,omitempty"` Subject string `json:"sub,omitempty"` } // Claims extends jose.Claims with step attributes. type Claims struct { jose.Claims SANs []string `json:"sans,omitempty"` Email string `json:"email,omitempty"` Nonce string `json:"nonce,omitempty"` } // matchesAudience returns true if A and B share at least one element. func matchesAudience(as, bs []string) bool { if len(bs) == 0 || len(as) == 0 { return false } for _, b := range bs { for _, a := range as { if b == a || stripPort(a) == stripPort(b) { return true } } } return false } // stripPort attempts to strip the port from the given url. If parsing the url // produces errors it will just return the passed argument. func stripPort(rawurl string) string { u, err := url.Parse(rawurl) if err != nil { return rawurl } u.Host = u.Hostname() return u.String() } // Authorize authorizes a signature request by validating and authenticating // a OTT that must be sent w/ the request. // TODO(mariano): protection against reuse for oidc func (a *Authority) Authorize(ott string) ([]provisioner.SignOption, error) { var errContext = map[string]interface{}{"ott": ott} // Validate payload token, err := jose.ParseSigned(ott) if err != nil { return nil, &apiError{errors.Wrapf(err, "authorize: error parsing token"), http.StatusUnauthorized, errContext} } // Get claims w/out verification. We need to look up the provisioner // key in order to verify the claims and we need the issuer from the claims // before we can look up the provisioner. var claims Claims if err = token.UnsafeClaimsWithoutVerification(&claims); err != nil { return nil, &apiError{err, http.StatusUnauthorized, errContext} } // Do not accept tokens issued before the start of the ca. // This check is meant as a stopgap solution to the current lack of a persistence layer. if a.config.AuthorityConfig != nil && !a.config.AuthorityConfig.DisableIssuedAtCheck { if claims.IssuedAt > 0 && claims.IssuedAt.Time().Before(a.startTime) { return nil, &apiError{errors.New("token issued before the bootstrap of certificate authority"), http.StatusUnauthorized, errContext} } } // This method will also validate the audiences for JWK provisioners. p, ok := a.provisioners.LoadByToken(token, &claims.Claims) if !ok { return nil, &apiError{errors.Errorf("authorize: provisioner not found"), http.StatusUnauthorized, errContext} } // Store the token to protect against reuse. if p.GetType() == provisioner.TypeJWK && claims.ID != "" { if _, ok := a.ottMap.LoadOrStore(claims.ID, &idUsed{ UsedAt: time.Now().Unix(), Subject: claims.Subject, }); ok { return nil, &apiError{errors.Errorf("token already used"), http.StatusUnauthorized, errContext} } } return p.Authorize(ott) } // authorizeRenewal tries to locate the step provisioner extension, and checks // if for the configured provisioner, the renewal is enabled or not. If the // extra extension cannot be found, authorize the renewal by default. // // TODO(mariano): should we authorize by default? func (a *Authority) authorizeRenewal(crt *x509.Certificate) error { errContext := map[string]interface{}{"serialNumber": crt.SerialNumber.String()} p, ok := a.provisioners.LoadByCertificate(crt) if !ok { return &apiError{ err: errors.New("provisioner not found"), code: http.StatusUnauthorized, context: errContext, } } if err := p.AuthorizeRenewal(crt); err != nil { return &apiError{ err: err, code: http.StatusUnauthorized, context: errContext, } } return nil }