96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
// Package silly provides a simple authentication scheme that checks for the
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// existence of an Authorization header and issues access if is present and
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// non-empty.
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//
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// This package is present as an example implementation of a minimal
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// auth.AccessController and for testing. This is not suitable for any kind of
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// production security.
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package silly
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import (
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"fmt"
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"net/http"
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"strings"
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"github.com/docker/distribution/auth"
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"golang.org/x/net/context"
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)
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// accessController provides a simple implementation of auth.AccessController
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// that simply checks for a non-empty Authorization header. It is useful for
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// demonstration and testing.
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type accessController struct {
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realm string
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service string
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}
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var _ auth.AccessController = &accessController{}
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func newAccessController(options map[string]interface{}) (auth.AccessController, error) {
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realm, present := options["realm"]
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if _, ok := realm.(string); !present || !ok {
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return nil, fmt.Errorf(`"realm" must be set for silly access controller`)
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}
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service, present := options["service"]
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if _, ok := service.(string); !present || !ok {
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return nil, fmt.Errorf(`"service" must be set for silly access controller`)
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}
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return &accessController{realm: realm.(string), service: service.(string)}, nil
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}
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// Authorized simply checks for the existence of the authorization header,
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// responding with a bearer challenge if it doesn't exist.
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func (ac *accessController) Authorized(ctx context.Context, accessRecords ...auth.Access) (context.Context, error) {
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req, err := auth.RequestFromContext(ctx)
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if err != nil {
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return nil, err
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}
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if req.Header.Get("Authorization") == "" {
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challenge := challenge{
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realm: ac.realm,
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service: ac.service,
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}
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if len(accessRecords) > 0 {
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var scopes []string
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for _, access := range accessRecords {
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scopes = append(scopes, fmt.Sprintf("%s:%s:%s", access.Type, access.Resource.Name, access.Action))
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}
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challenge.scope = strings.Join(scopes, " ")
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}
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return nil, &challenge
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}
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return context.WithValue(ctx, "auth.user", auth.UserInfo{Name: "silly"}), nil
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}
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type challenge struct {
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realm string
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service string
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scope string
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}
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func (ch *challenge) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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header := fmt.Sprintf("Bearer realm=%q,service=%q", ch.realm, ch.service)
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if ch.scope != "" {
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header = fmt.Sprintf("%s,scope=%q", header, ch.scope)
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}
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w.Header().Set("Authorization", header)
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w.WriteHeader(http.StatusUnauthorized)
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}
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func (ch *challenge) Error() string {
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return fmt.Sprintf("silly authentication challenge: %#v", ch)
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}
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// init registers the silly auth backend.
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func init() {
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auth.Register("silly", auth.InitFunc(newAccessController))
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}
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