Merge pull request #859 from jlhawn/ng_auth_package
Adds auth package with token auth backend
This commit is contained in:
Stephen Day
commit
3c0dbe2595
107
auth/auth.go
Normal file
107
auth/auth.go
Normal file
@ -0,0 +1,107 @@
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// Package auth defines a standard interface for request access controllers.
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//
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// An access controller has a simple interface with a single `Authorized`
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// method which checks that a given request is authorized to perform one or
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// more actions on one or more resources. This method should return a non-nil
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// error if the requset is not authorized.
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//
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// An implementation registers its access controller by name with a constructor
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// which accepts an options map for configuring the access controller.
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//
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// options := map[string]interface{}{"sillySecret": "whysosilly?"}
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// accessController, _ := auth.GetAccessController("silly", options)
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//
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// This `accessController` can then be used in a request handler like so:
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//
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// func updateOrder(w http.ResponseWriter, r *http.Request) {
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// orderNumber := r.FormValue("orderNumber")
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// resource := auth.Resource{Type: "customerOrder", Name: orderNumber}
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// access := auth.Access{Resource: resource, Action: "update"}
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//
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// if err := accessController.Authorized(r, access); err != nil {
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// if challenge, ok := err.(auth.Challenge) {
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// // Let the challenge write the response.
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// challenge.ServeHTTP(w, r)
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// } else {
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// // Some other error.
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// }
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// }
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// }
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//
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package auth
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import (
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"fmt"
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"net/http"
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)
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// Resource describes a resource by type and name.
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type Resource struct {
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Type string
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Name string
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}
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// Access describes a specific action that is
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// requested or allowed for a given recource.
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type Access struct {
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Resource
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Action string
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}
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// Challenge is a special error type which is used for HTTP 401 Unauthorized
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// responses and is able to write the response with WWW-Authenticate challenge
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// header values based on the error.
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type Challenge interface {
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error
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// ServeHTTP prepares the request to conduct the appropriate challenge
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// response. For most implementations, simply calling ServeHTTP should be
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// sufficient. Because no body is written, users may write a custom body after
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// calling ServeHTTP, but any headers must be written before the call and may
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// be overwritten.
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ServeHTTP(w http.ResponseWriter, r *http.Request)
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}
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// AccessController controls access to registry resources based on a request
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// and required access levels for a request. Implementations can support both
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// complete denial and http authorization challenges.
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type AccessController interface {
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// Authorized returns non-nil if the request is granted access. If one or
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// more Access structs are provided, the requested access will be compared
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// with what is available to the request. If the error is non-nil, access
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// should always be denied. The error may be of type Challenge, in which
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// case the caller may have the Challenge handle the request or choose
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// what action to take based on the Challenge header or response status.
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Authorized(req *http.Request, access ...Access) error
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}
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// InitFunc is the type of an AccessController factory function and is used
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// to register the contsructor for different AccesController backends.
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type InitFunc func(options map[string]interface{}) (AccessController, error)
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var accessControllers map[string]InitFunc
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func init() {
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accessControllers = make(map[string]InitFunc)
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}
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// Register is used to register an InitFunc for
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// an AccessController backend with the given name.
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func Register(name string, initFunc InitFunc) error {
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if _, exists := accessControllers[name]; exists {
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return fmt.Errorf("name already registered: %s", name)
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}
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accessControllers[name] = initFunc
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return nil
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}
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// GetAccessController constructs an AccessController
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// with the given options using the named backend.
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func GetAccessController(name string, options map[string]interface{}) (AccessController, error) {
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if initFunc, exists := accessControllers[name]; exists {
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return initFunc(options)
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}
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return nil, fmt.Errorf("no access controller registered with name: %s", name)
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}
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270
auth/token/accesscontroller.go
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270
auth/token/accesscontroller.go
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@ -0,0 +1,270 @@
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package token
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import (
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"crypto"
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"crypto/x509"
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"encoding/pem"
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"errors"
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"fmt"
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"io/ioutil"
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"net/http"
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"os"
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"strconv"
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"strings"
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"github.com/docker/libtrust"
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"github.com/docker/docker-registry/auth"
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"github.com/docker/docker-registry/common"
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)
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// accessSet maps a typed, named resource to
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// a set of actions requested or authorized.
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type accessSet map[auth.Resource]actionSet
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// newAccessSet constructs an accessSet from
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// a variable number of auth.Access items.
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func newAccessSet(accessItems ...auth.Access) accessSet {
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accessSet := make(accessSet, len(accessItems))
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for _, access := range accessItems {
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resource := auth.Resource{
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Type: access.Type,
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Name: access.Name,
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}
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set, exists := accessSet[resource]
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if !exists {
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set = newActionSet()
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accessSet[resource] = set
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}
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set.Add(access.Action)
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}
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return accessSet
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}
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// contains returns whether or not the given access is in this accessSet.
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func (s accessSet) contains(access auth.Access) bool {
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actionSet, ok := s[access.Resource]
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if ok {
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return actionSet.Contains(access.Action)
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}
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return false
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}
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// scopeParam returns a collection of scopes which can
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// be used for a WWW-Authenticate challenge parameter.
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// See https://tools.ietf.org/html/rfc6750#section-3
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func (s accessSet) scopeParam() string {
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scopes := make([]string, 0, len(s))
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for resource, actionSet := range s {
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actions := strings.Join(actionSet.Keys(), ",")
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scopes = append(scopes, fmt.Sprintf("%s:%s:%s", resource.Type, resource.Name, actions))
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}
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return strings.Join(scopes, " ")
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}
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// Errors used and exported by this package.
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var (
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ErrInsufficientScope = errors.New("insufficient scope")
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ErrTokenRequired = errors.New("authorization token required")
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)
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// authChallenge implements the auth.Challenge interface.
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type authChallenge struct {
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err error
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realm string
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service string
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accessSet accessSet
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}
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// Error returns the internal error string for this authChallenge.
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func (ac *authChallenge) Error() string {
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return ac.err.Error()
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}
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// Status returns the HTTP Response Status Code for this authChallenge.
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func (ac *authChallenge) Status() int {
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return http.StatusUnauthorized
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}
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// challengeParams constructs the value to be used in
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// the WWW-Authenticate response challenge header.
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// See https://tools.ietf.org/html/rfc6750#section-3
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func (ac *authChallenge) challengeParams() string {
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str := fmt.Sprintf("Bearer realm=%s,service=%s", strconv.Quote(ac.realm), strconv.Quote(ac.service))
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if scope := ac.accessSet.scopeParam(); scope != "" {
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str = fmt.Sprintf("%s,scope=%s", str, strconv.Quote(scope))
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}
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if ac.err == ErrInvalidToken || ac.err == ErrMalformedToken {
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str = fmt.Sprintf("%s,error=%s", str, strconv.Quote("invalid_token"))
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} else if ac.err == ErrInsufficientScope {
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str = fmt.Sprintf("%s,error=%s", str, strconv.Quote("insufficient_scope"))
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}
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return str
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}
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// SetHeader sets the WWW-Authenticate value for the given header.
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func (ac *authChallenge) SetHeader(header http.Header) {
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header.Add("WWW-Authenticate", ac.challengeParams())
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}
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// ServeHttp handles writing the challenge response
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// by setting the challenge header and status code.
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func (ac *authChallenge) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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ac.SetHeader(w.Header())
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w.WriteHeader(ac.Status())
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}
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// accessController implements the auth.AccessController interface.
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type accessController struct {
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realm string
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issuer string
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service string
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rootCerts *x509.CertPool
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trustedKeys map[string]libtrust.PublicKey
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}
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// tokenAccessOptions is a convenience type for handling
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// options to the contstructor of an accessController.
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type tokenAccessOptions struct {
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realm string
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issuer string
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service string
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rootCertBundle string
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}
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// checkOptions gathers the necessary options
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// for an accessController from the given map.
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func checkOptions(options map[string]interface{}) (tokenAccessOptions, error) {
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var opts tokenAccessOptions
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keys := []string{"realm", "issuer", "service", "rootCertBundle"}
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vals := make([]string, 0, len(keys))
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for _, key := range keys {
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val, ok := options[key].(string)
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if !ok {
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return opts, fmt.Errorf("token auth requires a valid option string: %q", key)
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}
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vals = append(vals, val)
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}
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opts.realm, opts.issuer, opts.service, opts.rootCertBundle = vals[0], vals[1], vals[2], vals[3]
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return opts, nil
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}
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// newAccessController creates an accessController using the given options.
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func newAccessController(options map[string]interface{}) (auth.AccessController, error) {
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config, err := checkOptions(options)
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if err != nil {
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return nil, err
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}
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fp, err := os.Open(config.rootCertBundle)
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if err != nil {
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return nil, fmt.Errorf("unable to open token auth root certificate bundle file %q: %s", config.rootCertBundle, err)
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}
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defer fp.Close()
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rawCertBundle, err := ioutil.ReadAll(fp)
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if err != nil {
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return nil, fmt.Errorf("unable to read token auth root certificate bundle file %q: %s", config.rootCertBundle, err)
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}
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var rootCerts []*x509.Certificate
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pemBlock, rawCertBundle := pem.Decode(rawCertBundle)
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for pemBlock != nil {
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cert, err := x509.ParseCertificate(pemBlock.Bytes)
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if err != nil {
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return nil, fmt.Errorf("unable to parse token auth root certificate: %s", err)
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}
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rootCerts = append(rootCerts, cert)
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pemBlock, rawCertBundle = pem.Decode(rawCertBundle)
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}
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if len(rootCerts) == 0 {
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return nil, errors.New("token auth requires at least one token signing root certificate")
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}
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rootPool := x509.NewCertPool()
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trustedKeys := make(map[string]libtrust.PublicKey, len(rootCerts))
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for _, rootCert := range rootCerts {
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rootPool.AddCert(rootCert)
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pubKey, err := libtrust.FromCryptoPublicKey(crypto.PublicKey(rootCert.PublicKey))
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if err != nil {
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return nil, fmt.Errorf("unable to get public key from token auth root certificate: %s", err)
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}
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trustedKeys[pubKey.KeyID()] = pubKey
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}
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return &accessController{
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realm: config.realm,
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issuer: config.issuer,
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service: config.service,
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rootCerts: rootPool,
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trustedKeys: trustedKeys,
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}, nil
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}
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// Authorized handles checking whether the given request is authorized
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// for actions on resources described by the given access items.
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func (ac *accessController) Authorized(req *http.Request, accessItems ...auth.Access) error {
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challenge := &authChallenge{
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realm: ac.realm,
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service: ac.service,
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accessSet: newAccessSet(accessItems...),
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}
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parts := strings.Split(req.Header.Get("Authorization"), " ")
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if len(parts) != 2 || strings.ToLower(parts[0]) != "bearer" {
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challenge.err = ErrTokenRequired
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return challenge
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}
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rawToken := parts[1]
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token, err := NewToken(rawToken)
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if err != nil {
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challenge.err = err
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return challenge
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}
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verifyOpts := VerifyOptions{
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TrustedIssuers: common.NewStringSet(ac.issuer),
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AcceptedAudiences: common.NewStringSet(ac.service),
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Roots: ac.rootCerts,
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TrustedKeys: ac.trustedKeys,
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}
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if err = token.Verify(verifyOpts); err != nil {
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challenge.err = err
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return challenge
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}
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accessSet := token.accessSet()
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for _, access := range accessItems {
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if !accessSet.contains(access) {
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challenge.err = ErrInsufficientScope
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return challenge
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}
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}
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return nil
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}
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// init handles registering the token auth backend.
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func init() {
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auth.Register("token", auth.InitFunc(newAccessController))
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}
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332
auth/token/token.go
Normal file
332
auth/token/token.go
Normal file
@ -0,0 +1,332 @@
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package token
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import (
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"crypto"
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"crypto/x509"
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"encoding/base64"
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"encoding/json"
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"errors"
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"fmt"
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"strings"
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"time"
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log "github.com/Sirupsen/logrus"
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"github.com/docker/libtrust"
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"github.com/docker/docker-registry/auth"
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"github.com/docker/docker-registry/common"
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)
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const (
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// TokenSeparator is the value which separates the header, claims, and
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// signature in the compact serialization of a JSON Web Token.
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TokenSeparator = "."
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)
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// Errors used by token parsing and verification.
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var (
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ErrMalformedToken = errors.New("malformed token")
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ErrInvalidToken = errors.New("invalid token")
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)
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// ResourceActions stores allowed actions on a named and typed resource.
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type ResourceActions struct {
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Type string `json:"type"`
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Name string `json:"name"`
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Actions []string `json:"actions"`
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}
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// ClaimSet describes the main section of a JSON Web Token.
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type ClaimSet struct {
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// Public claims
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Issuer string `json:"iss"`
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Subject string `json:"sub"`
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Audience string `json:"aud"`
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Expiration int64 `json:"exp"`
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NotBefore int64 `json:"nbf"`
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IssuedAt int64 `json:"iat"`
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JWTID string `json:"jti"`
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// Private claims
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Access []*ResourceActions
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}
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// Header describes the header section of a JSON Web Token.
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type Header struct {
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Type string `json:"typ"`
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SigningAlg string `json:"alg"`
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KeyID string `json:"kid,omitempty"`
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RawJWK json.RawMessage `json:"jwk"`
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SigningKey libtrust.PublicKey `json:"-"`
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}
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// CheckSigningKey parses the `jwk` field of a JOSE header and sets the
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// SigningKey field if it is valid.
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func (h *Header) CheckSigningKey() (err error) {
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if len(h.RawJWK) == 0 {
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// No signing key was specified.
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return
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}
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h.SigningKey, err = libtrust.UnmarshalPublicKeyJWK([]byte(h.RawJWK))
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h.RawJWK = nil // Don't need this anymore!
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return
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}
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// Token describes a JSON Web Token.
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type Token struct {
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Raw string
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Header *Header
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Claims *ClaimSet
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Signature []byte
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}
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|
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// VerifyOptions is used to specify
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// options when verifying a JSON Web Token.
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type VerifyOptions struct {
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TrustedIssuers common.StringSet
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AcceptedAudiences common.StringSet
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Roots *x509.CertPool
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TrustedKeys map[string]libtrust.PublicKey
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}
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// NewToken parses the given raw token string
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// and constructs an unverified JSON Web Token.
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func NewToken(rawToken string) (*Token, error) {
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parts := strings.Split(rawToken, TokenSeparator)
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if len(parts) != 3 {
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return nil, ErrMalformedToken
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}
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|
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var (
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rawHeader, rawClaims = parts[0], parts[1]
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headerJSON, claimsJSON []byte
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err error
|
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)
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|
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defer func() {
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if err != nil {
|
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log.Errorf("error while unmarshalling raw token: %s", err)
|
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}
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}()
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if headerJSON, err = joseBase64UrlDecode(rawHeader); err != nil {
|
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err = fmt.Errorf("unable to decode header: %s", err)
|
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return nil, ErrMalformedToken
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}
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|
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if claimsJSON, err = joseBase64UrlDecode(rawClaims); err != nil {
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err = fmt.Errorf("unable to decode claims: %s", err)
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return nil, ErrMalformedToken
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}
|
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|
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token := new(Token)
|
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token.Header = new(Header)
|
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token.Claims = new(ClaimSet)
|
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|
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token.Raw = strings.Join(parts[:2], TokenSeparator)
|
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if token.Signature, err = joseBase64UrlDecode(parts[2]); err != nil {
|
||||
err = fmt.Errorf("unable to decode signature: %s", err)
|
||||
return nil, ErrMalformedToken
|
||||
}
|
||||
|
||||
if err = json.Unmarshal(headerJSON, token.Header); err != nil {
|
||||
return nil, ErrMalformedToken
|
||||
}
|
||||
|
||||
if err = token.Header.CheckSigningKey(); err != nil {
|
||||
return nil, ErrMalformedToken
|
||||
}
|
||||
|
||||
if err = json.Unmarshal(claimsJSON, token.Claims); err != nil {
|
||||
return nil, ErrMalformedToken
|
||||
}
|
||||
|
||||
return token, nil
|
||||
}
|
||||
|
||||
// Verify attempts to verify this token using the given options.
|
||||
// Returns a nil error if the token is valid.
|
||||
func (t *Token) Verify(verifyOpts VerifyOptions) error {
|
||||
// Verify that the Issuer claim is a trusted authority.
|
||||
if !verifyOpts.TrustedIssuers.Contains(t.Claims.Issuer) {
|
||||
log.Errorf("token from untrusted issuer: %q", t.Claims.Issuer)
|
||||
return ErrInvalidToken
|
||||
}
|
||||
|
||||
// Verify that the Audience claim is allowed.
|
||||
if !verifyOpts.AcceptedAudiences.Contains(t.Claims.Audience) {
|
||||
log.Errorf("token intended for another audience: %q", t.Claims.Audience)
|
||||
return ErrInvalidToken
|
||||
}
|
||||
|
||||
// Verify that the token is currently usable and not expired.
|
||||
currentUnixTime := time.Now().Unix()
|
||||
if !(t.Claims.NotBefore <= currentUnixTime && currentUnixTime <= t.Claims.Expiration) {
|
||||
log.Errorf("token not to be used before %d or after %d - currently %d", t.Claims.NotBefore, t.Claims.Expiration, currentUnixTime)
|
||||
return ErrInvalidToken
|
||||
}
|
||||
|
||||
// Verify the token signature.
|
||||
if len(t.Signature) == 0 {
|
||||
log.Error("token has no signature")
|
||||
return ErrInvalidToken
|
||||
}
|
||||
|
||||
// If the token header has a SigningKey field, verify the signature
|
||||
// using that key and its included x509 certificate chain if necessary.
|
||||
// If the Header's SigningKey field is nil, try using the KeyID field.
|
||||
signingKey := t.Header.SigningKey
|
||||
|
||||
if signingKey == nil {
|
||||
// Find the key in the given collection of trusted keys.
|
||||
trustedKey, ok := verifyOpts.TrustedKeys[t.Header.KeyID]
|
||||
if !ok {
|
||||
log.Errorf("token signed by untrusted key with ID: %q", t.Header.KeyID)
|
||||
return ErrInvalidToken
|
||||
}
|
||||
signingKey = trustedKey
|
||||
}
|
||||
|
||||
// First verify the signature of the token using the key which signed it.
|
||||
if err := signingKey.Verify(strings.NewReader(t.Raw), t.Header.SigningAlg, t.Signature); err != nil {
|
||||
log.Errorf("unable to verify token signature: %s", err)
|
||||
return ErrInvalidToken
|
||||
}
|
||||
|
||||
// Next, check if the signing key is one of the trusted keys.
|
||||
if _, isTrustedKey := verifyOpts.TrustedKeys[signingKey.KeyID()]; isTrustedKey {
|
||||
// We're done! The token was signed by
|
||||
// a trusted key and has been verified!
|
||||
return nil
|
||||
}
|
||||
|
||||
// Otherwise, we need to check the sigining keys included certificate chain.
|
||||
return t.verifyCertificateChain(signingKey, verifyOpts.Roots)
|
||||
}
|
||||
|
||||
// verifyCertificateChain attempts to verify the token using the "x5c" field
|
||||
// of the given leafKey which was used to sign it. Returns a nil error if
|
||||
// the key's certificate chain is valid and rooted an one of the given roots.
|
||||
func (t *Token) verifyCertificateChain(leafKey libtrust.PublicKey, roots *x509.CertPool) error {
|
||||
// In this case, the token signature is valid, but the key that signed it
|
||||
// is not in our set of trusted keys. So, we'll need to check if the
|
||||
// token's signing key included an x509 certificate chain that can be
|
||||
// verified up to one of our trusted roots.
|
||||
x5cVal, ok := leafKey.GetExtendedField("x5c").([]interface{})
|
||||
if !ok || x5cVal == nil {
|
||||
log.Error("unable to verify token signature: signed by untrusted key with no valid certificate chain")
|
||||
return ErrInvalidToken
|
||||
}
|
||||
|
||||
// Ensure each item is of the correct type.
|
||||
x5c := make([]string, len(x5cVal))
|
||||
for i, val := range x5cVal {
|
||||
certString, ok := val.(string)
|
||||
if !ok || len(certString) == 0 {
|
||||
log.Error("unable to verify token signature: signed by untrusted key with malformed certificate chain")
|
||||
return ErrInvalidToken
|
||||
}
|
||||
x5c[i] = certString
|
||||
}
|
||||
|
||||
// Ensure the first element is encoded correctly.
|
||||
leafCertDer, err := base64.StdEncoding.DecodeString(x5c[0])
|
||||
if err != nil {
|
||||
log.Errorf("unable to decode signing key leaf cert: %s", err)
|
||||
return ErrInvalidToken
|
||||
}
|
||||
|
||||
// And that it is a valid x509 certificate.
|
||||
leafCert, err := x509.ParseCertificate(leafCertDer)
|
||||
if err != nil {
|
||||
log.Errorf("unable to parse signing key leaf cert: %s", err)
|
||||
return ErrInvalidToken
|
||||
}
|
||||
|
||||
// Verify that the public key in the leaf cert *is* the signing key.
|
||||
leafCryptoKey, ok := leafCert.PublicKey.(crypto.PublicKey)
|
||||
if !ok {
|
||||
log.Error("unable to get signing key leaf cert public key value")
|
||||
return ErrInvalidToken
|
||||
}
|
||||
|
||||
leafPubKey, err := libtrust.FromCryptoPublicKey(leafCryptoKey)
|
||||
if err != nil {
|
||||
log.Errorf("unable to make libtrust public key from signing key leaf cert: %s", err)
|
||||
return ErrInvalidToken
|
||||
}
|
||||
|
||||
if leafPubKey.KeyID() != leafKey.KeyID() {
|
||||
log.Error("token signing key ID and leaf certificate public key ID do not match")
|
||||
return ErrInvalidToken
|
||||
}
|
||||
|
||||
// The rest of the x5c array are intermediate certificates.
|
||||
intermediates := x509.NewCertPool()
|
||||
for i := 1; i < len(x5c); i++ {
|
||||
intermediateCertDer, err := base64.StdEncoding.DecodeString(x5c[i])
|
||||
if err != nil {
|
||||
log.Errorf("unable to decode signing key intermediate cert: %s", err)
|
||||
return ErrInvalidToken
|
||||
}
|
||||
|
||||
intermediateCert, err := x509.ParseCertificate(intermediateCertDer)
|
||||
if err != nil {
|
||||
log.Errorf("unable to parse signing key intermediate cert: %s", err)
|
||||
return ErrInvalidToken
|
||||
}
|
||||
|
||||
intermediates.AddCert(intermediateCert)
|
||||
}
|
||||
|
||||
verifyOpts := x509.VerifyOptions{
|
||||
Intermediates: intermediates,
|
||||
Roots: roots,
|
||||
KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageAny},
|
||||
}
|
||||
|
||||
// TODO: this call returns certificate chains which we ignore for now, but
|
||||
// we should check them for revocations if we have the ability later.
|
||||
if _, err = leafCert.Verify(verifyOpts); err != nil {
|
||||
log.Errorf("unable to verify signing key certificate: %s", err)
|
||||
return ErrInvalidToken
|
||||
}
|
||||
|
||||
// The signing key's x509 chain is valid!
|
||||
return nil
|
||||
}
|
||||
|
||||
// accessSet returns a set of actions available for the resource
|
||||
// actions listed in the `access` section of this token.
|
||||
func (t *Token) accessSet() accessSet {
|
||||
if t.Claims == nil {
|
||||
return nil
|
||||
}
|
||||
|
||||
accessSet := make(accessSet, len(t.Claims.Access))
|
||||
|
||||
for _, resourceActions := range t.Claims.Access {
|
||||
resource := auth.Resource{
|
||||
Type: resourceActions.Type,
|
||||
Name: resourceActions.Name,
|
||||
}
|
||||
|
||||
set, exists := accessSet[resource]
|
||||
if !exists {
|
||||
set = newActionSet()
|
||||
accessSet[resource] = set
|
||||
}
|
||||
|
||||
for _, action := range resourceActions.Actions {
|
||||
set.Add(action)
|
||||
}
|
||||
}
|
||||
|
||||
return accessSet
|
||||
}
|
||||
|
||||
func (t *Token) compactRaw() string {
|
||||
return fmt.Sprintf("%s.%s", t.Raw, joseBase64UrlEncode(t.Signature))
|
||||
}
|
||||
364
auth/token/token_test.go
Normal file
364
auth/token/token_test.go
Normal file
@ -0,0 +1,364 @@
|
||||
package token
|
||||
|
||||
import (
|
||||
"crypto"
|
||||
"crypto/rand"
|
||||
"crypto/x509"
|
||||
"encoding/base64"
|
||||
"encoding/json"
|
||||
"encoding/pem"
|
||||
"fmt"
|
||||
"io/ioutil"
|
||||
"net/http"
|
||||
"os"
|
||||
"strings"
|
||||
"testing"
|
||||
"time"
|
||||
|
||||
"github.com/docker/libtrust"
|
||||
|
||||
"github.com/docker/docker-registry/auth"
|
||||
"github.com/docker/docker-registry/common"
|
||||
)
|
||||
|
||||
func makeRootKeys(numKeys int) ([]libtrust.PrivateKey, error) {
|
||||
keys := make([]libtrust.PrivateKey, 0, numKeys)
|
||||
|
||||
for i := 0; i < numKeys; i++ {
|
||||
key, err := libtrust.GenerateECP256PrivateKey()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
keys = append(keys, key)
|
||||
}
|
||||
|
||||
return keys, nil
|
||||
}
|
||||
|
||||
func makeSigningKeyWithChain(rootKey libtrust.PrivateKey, depth int) (libtrust.PrivateKey, error) {
|
||||
if depth == 0 {
|
||||
// Don't need to build a chain.
|
||||
return rootKey, nil
|
||||
}
|
||||
|
||||
var (
|
||||
x5c = make([]string, depth)
|
||||
parentKey = rootKey
|
||||
key libtrust.PrivateKey
|
||||
cert *x509.Certificate
|
||||
err error
|
||||
)
|
||||
|
||||
for depth > 0 {
|
||||
if key, err = libtrust.GenerateECP256PrivateKey(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
if cert, err = libtrust.GenerateCACert(parentKey, key); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
depth--
|
||||
x5c[depth] = base64.StdEncoding.EncodeToString(cert.Raw)
|
||||
parentKey = key
|
||||
}
|
||||
|
||||
key.AddExtendedField("x5c", x5c)
|
||||
|
||||
return key, nil
|
||||
}
|
||||
|
||||
func makeRootCerts(rootKeys []libtrust.PrivateKey) ([]*x509.Certificate, error) {
|
||||
certs := make([]*x509.Certificate, 0, len(rootKeys))
|
||||
|
||||
for _, key := range rootKeys {
|
||||
cert, err := libtrust.GenerateCACert(key, key)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
certs = append(certs, cert)
|
||||
}
|
||||
|
||||
return certs, nil
|
||||
}
|
||||
|
||||
func makeTrustedKeyMap(rootKeys []libtrust.PrivateKey) map[string]libtrust.PublicKey {
|
||||
trustedKeys := make(map[string]libtrust.PublicKey, len(rootKeys))
|
||||
|
||||
for _, key := range rootKeys {
|
||||
trustedKeys[key.KeyID()] = key.PublicKey()
|
||||
}
|
||||
|
||||
return trustedKeys
|
||||
}
|
||||
|
||||
func makeTestToken(issuer, audience string, access []*ResourceActions, rootKey libtrust.PrivateKey, depth int) (*Token, error) {
|
||||
signingKey, err := makeSigningKeyWithChain(rootKey, depth)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("unable to amke signing key with chain: %s", err)
|
||||
}
|
||||
|
||||
rawJWK, err := signingKey.PublicKey().MarshalJSON()
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("unable to marshal signing key to JSON: %s", err)
|
||||
}
|
||||
|
||||
joseHeader := &Header{
|
||||
Type: "JWT",
|
||||
SigningAlg: "ES256",
|
||||
RawJWK: json.RawMessage(rawJWK),
|
||||
}
|
||||
|
||||
now := time.Now()
|
||||
|
||||
randomBytes := make([]byte, 15)
|
||||
if _, err = rand.Read(randomBytes); err != nil {
|
||||
return nil, fmt.Errorf("unable to read random bytes for jwt id: %s", err)
|
||||
}
|
||||
|
||||
claimSet := &ClaimSet{
|
||||
Issuer: issuer,
|
||||
Subject: "foo",
|
||||
Audience: audience,
|
||||
Expiration: now.Add(5 * time.Minute).Unix(),
|
||||
NotBefore: now.Unix(),
|
||||
IssuedAt: now.Unix(),
|
||||
JWTID: base64.URLEncoding.EncodeToString(randomBytes),
|
||||
Access: access,
|
||||
}
|
||||
|
||||
var joseHeaderBytes, claimSetBytes []byte
|
||||
|
||||
if joseHeaderBytes, err = json.Marshal(joseHeader); err != nil {
|
||||
return nil, fmt.Errorf("unable to marshal jose header: %s", err)
|
||||
}
|
||||
if claimSetBytes, err = json.Marshal(claimSet); err != nil {
|
||||
return nil, fmt.Errorf("unable to marshal claim set: %s", err)
|
||||
}
|
||||
|
||||
encodedJoseHeader := joseBase64UrlEncode(joseHeaderBytes)
|
||||
encodedClaimSet := joseBase64UrlEncode(claimSetBytes)
|
||||
encodingToSign := fmt.Sprintf("%s.%s", encodedJoseHeader, encodedClaimSet)
|
||||
|
||||
var signatureBytes []byte
|
||||
if signatureBytes, _, err = signingKey.Sign(strings.NewReader(encodingToSign), crypto.SHA256); err != nil {
|
||||
return nil, fmt.Errorf("unable to sign jwt payload: %s", err)
|
||||
}
|
||||
|
||||
signature := joseBase64UrlEncode(signatureBytes)
|
||||
tokenString := fmt.Sprintf("%s.%s", encodingToSign, signature)
|
||||
|
||||
return NewToken(tokenString)
|
||||
}
|
||||
|
||||
// This test makes 4 tokens with a varying number of intermediate
|
||||
// certificates ranging from no intermediate chain to a length of 3
|
||||
// intermediates.
|
||||
func TestTokenVerify(t *testing.T) {
|
||||
var (
|
||||
numTokens = 4
|
||||
issuer = "test-issuer"
|
||||
audience = "test-audience"
|
||||
access = []*ResourceActions{
|
||||
{
|
||||
Type: "repository",
|
||||
Name: "foo/bar",
|
||||
Actions: []string{"pull", "push"},
|
||||
},
|
||||
}
|
||||
)
|
||||
|
||||
rootKeys, err := makeRootKeys(numTokens)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
rootCerts, err := makeRootCerts(rootKeys)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
rootPool := x509.NewCertPool()
|
||||
for _, rootCert := range rootCerts {
|
||||
rootPool.AddCert(rootCert)
|
||||
}
|
||||
|
||||
trustedKeys := makeTrustedKeyMap(rootKeys)
|
||||
|
||||
tokens := make([]*Token, 0, numTokens)
|
||||
|
||||
for i := 0; i < numTokens; i++ {
|
||||
token, err := makeTestToken(issuer, audience, access, rootKeys[i], i)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
tokens = append(tokens, token)
|
||||
}
|
||||
|
||||
verifyOps := VerifyOptions{
|
||||
TrustedIssuers: common.NewStringSet(issuer),
|
||||
AcceptedAudiences: common.NewStringSet(audience),
|
||||
Roots: rootPool,
|
||||
TrustedKeys: trustedKeys,
|
||||
}
|
||||
|
||||
for _, token := range tokens {
|
||||
if err := token.Verify(verifyOps); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func writeTempRootCerts(rootKeys []libtrust.PrivateKey) (filename string, err error) {
|
||||
rootCerts, err := makeRootCerts(rootKeys)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
tempFile, err := ioutil.TempFile("", "rootCertBundle")
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
defer tempFile.Close()
|
||||
|
||||
for _, cert := range rootCerts {
|
||||
if err = pem.Encode(tempFile, &pem.Block{
|
||||
Type: "CERTIFICATE",
|
||||
Bytes: cert.Raw,
|
||||
}); err != nil {
|
||||
os.Remove(tempFile.Name())
|
||||
return "", err
|
||||
}
|
||||
}
|
||||
|
||||
return tempFile.Name(), nil
|
||||
}
|
||||
|
||||
// TestAccessController tests complete integration of the token auth package.
|
||||
// It starts by mocking the options for a token auth accessController which
|
||||
// it creates. It then tries a few mock requests:
|
||||
// - don't supply a token; should error with challenge
|
||||
// - supply an invalid token; should error with challenge
|
||||
// - supply a token with insufficient access; should error with challenge
|
||||
// - supply a valid token; should not error
|
||||
func TestAccessController(t *testing.T) {
|
||||
// Make 2 keys; only the first is to be a trusted root key.
|
||||
rootKeys, err := makeRootKeys(2)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
rootCertBundleFilename, err := writeTempRootCerts(rootKeys[:1])
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
defer os.Remove(rootCertBundleFilename)
|
||||
|
||||
realm := "https://auth.example.com/token/"
|
||||
issuer := "test-issuer.example.com"
|
||||
service := "test-service.example.com"
|
||||
|
||||
options := map[string]interface{}{
|
||||
"realm": realm,
|
||||
"issuer": issuer,
|
||||
"service": service,
|
||||
"rootCertBundle": rootCertBundleFilename,
|
||||
}
|
||||
|
||||
accessController, err := newAccessController(options)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
// 1. Make a mock http.Request with no token.
|
||||
req, err := http.NewRequest("GET", "http://example.com/foo", nil)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
testAccess := auth.Access{
|
||||
Resource: auth.Resource{
|
||||
Type: "foo",
|
||||
Name: "bar",
|
||||
},
|
||||
Action: "baz",
|
||||
}
|
||||
|
||||
err = accessController.Authorized(req, testAccess)
|
||||
challenge, ok := err.(auth.Challenge)
|
||||
if !ok {
|
||||
t.Fatal("accessController did not return a challenge")
|
||||
}
|
||||
|
||||
if challenge.Error() != ErrTokenRequired.Error() {
|
||||
t.Fatalf("accessControler did not get expected error - got %s - expected %s", challenge, ErrTokenRequired)
|
||||
}
|
||||
|
||||
// 2. Supply an invalid token.
|
||||
token, err := makeTestToken(
|
||||
issuer, service,
|
||||
[]*ResourceActions{{
|
||||
Type: testAccess.Type,
|
||||
Name: testAccess.Name,
|
||||
Actions: []string{testAccess.Action},
|
||||
}},
|
||||
rootKeys[1], 1, // Everything is valid except the key which signed it.
|
||||
)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.compactRaw()))
|
||||
|
||||
err = accessController.Authorized(req, testAccess)
|
||||
challenge, ok = err.(auth.Challenge)
|
||||
if !ok {
|
||||
t.Fatal("accessController did not return a challenge")
|
||||
}
|
||||
|
||||
if challenge.Error() != ErrInvalidToken.Error() {
|
||||
t.Fatalf("accessControler did not get expected error - got %s - expected %s", challenge, ErrTokenRequired)
|
||||
}
|
||||
|
||||
// 3. Supply a token with insufficient access.
|
||||
token, err = makeTestToken(
|
||||
issuer, service,
|
||||
[]*ResourceActions{}, // No access specified.
|
||||
rootKeys[0], 1,
|
||||
)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.compactRaw()))
|
||||
|
||||
err = accessController.Authorized(req, testAccess)
|
||||
challenge, ok = err.(auth.Challenge)
|
||||
if !ok {
|
||||
t.Fatal("accessController did not return a challenge")
|
||||
}
|
||||
|
||||
if challenge.Error() != ErrInsufficientScope.Error() {
|
||||
t.Fatalf("accessControler did not get expected error - got %s - expected %s", challenge, ErrInsufficientScope)
|
||||
}
|
||||
|
||||
// 4. Supply the token we need, or deserve, or whatever.
|
||||
token, err = makeTestToken(
|
||||
issuer, service,
|
||||
[]*ResourceActions{{
|
||||
Type: testAccess.Type,
|
||||
Name: testAccess.Name,
|
||||
Actions: []string{testAccess.Action},
|
||||
}},
|
||||
rootKeys[0], 1, // Everything is valid except the key which signed it.
|
||||
)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token.compactRaw()))
|
||||
|
||||
if err = accessController.Authorized(req, testAccess); err != nil {
|
||||
t.Fatalf("accessController returned unexpected error: %s", err)
|
||||
}
|
||||
}
|
||||
49
auth/token/util.go
Normal file
49
auth/token/util.go
Normal file
@ -0,0 +1,49 @@
|
||||
package token
|
||||
|
||||
import (
|
||||
"encoding/base64"
|
||||
"errors"
|
||||
"strings"
|
||||
|
||||
"github.com/docker/docker-registry/common"
|
||||
)
|
||||
|
||||
// joseBase64UrlEncode encodes the given data using the standard base64 url
|
||||
// encoding format but with all trailing '=' characters ommitted in accordance
|
||||
// with the jose specification.
|
||||
// http://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31#section-2
|
||||
func joseBase64UrlEncode(b []byte) string {
|
||||
return strings.TrimRight(base64.URLEncoding.EncodeToString(b), "=")
|
||||
}
|
||||
|
||||
// joseBase64UrlDecode decodes the given string using the standard base64 url
|
||||
// decoder but first adds the appropriate number of trailing '=' characters in
|
||||
// accordance with the jose specification.
|
||||
// http://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31#section-2
|
||||
func joseBase64UrlDecode(s string) ([]byte, error) {
|
||||
switch len(s) % 4 {
|
||||
case 0:
|
||||
case 2:
|
||||
s += "=="
|
||||
case 3:
|
||||
s += "="
|
||||
default:
|
||||
return nil, errors.New("illegal base64url string")
|
||||
}
|
||||
return base64.URLEncoding.DecodeString(s)
|
||||
}
|
||||
|
||||
// actionSet is a special type of stringSet.
|
||||
type actionSet struct {
|
||||
common.StringSet
|
||||
}
|
||||
|
||||
func newActionSet(actions ...string) actionSet {
|
||||
return actionSet{common.NewStringSet(actions...)}
|
||||
}
|
||||
|
||||
// Contains calls StringSet.Contains() for
|
||||
// either "*" or the given action string.
|
||||
func (s actionSet) Contains(action string) bool {
|
||||
return s.StringSet.Contains("*") || s.StringSet.Contains(action)
|
||||
}
|
||||
35
common/stringset.go
Normal file
35
common/stringset.go
Normal file
@ -0,0 +1,35 @@
|
||||
package common
|
||||
|
||||
// StringSet is a useful type for looking up strings.
|
||||
type StringSet map[string]struct{}
|
||||
|
||||
// NewStringSet creates a new StringSet with the given strings.
|
||||
func NewStringSet(keys ...string) StringSet {
|
||||
ss := make(StringSet, len(keys))
|
||||
ss.Add(keys...)
|
||||
return ss
|
||||
}
|
||||
|
||||
// Add inserts the given keys into this StringSet.
|
||||
func (ss StringSet) Add(keys ...string) {
|
||||
for _, key := range keys {
|
||||
ss[key] = struct{}{}
|
||||
}
|
||||
}
|
||||
|
||||
// Contains returns whether the given key is in this StringSet.
|
||||
func (ss StringSet) Contains(key string) bool {
|
||||
_, ok := ss[key]
|
||||
return ok
|
||||
}
|
||||
|
||||
// Keys returns a slice of all keys in this StringSet.
|
||||
func (ss StringSet) Keys() []string {
|
||||
keys := make([]string, 0, len(ss))
|
||||
|
||||
for key := range ss {
|
||||
keys = append(keys, key)
|
||||
}
|
||||
|
||||
return keys
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user