9c88801a12
Back in the before time, the best practices surrounding usage of Context weren't quite worked out. We defined our own type to make usage easier. As this packaged was used elsewhere, it make it more and more challenging to integrate with the forked `Context` type. Now that it is available in the standard library, we can just use that one directly. To make usage more consistent, we now use `dcontext` when referring to the distribution context package. Signed-off-by: Stephen J Day <stephen.day@docker.com>
117 lines
2.8 KiB
Go
117 lines
2.8 KiB
Go
// Package htpasswd provides a simple authentication scheme that checks for the
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// user credential hash in an htpasswd formatted file in a configuration-determined
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// location.
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//
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// This authentication method MUST be used under TLS, as simple token-replay attack is possible.
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package htpasswd
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import (
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"context"
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"fmt"
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"net/http"
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"os"
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"sync"
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"time"
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dcontext "github.com/docker/distribution/context"
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"github.com/docker/distribution/registry/auth"
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)
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type accessController struct {
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realm string
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path string
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modtime time.Time
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mu sync.Mutex
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htpasswd *htpasswd
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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 htpasswd access controller`)
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}
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path, present := options["path"]
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if _, ok := path.(string); !present || !ok {
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return nil, fmt.Errorf(`"path" must be set for htpasswd access controller`)
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}
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return &accessController{realm: realm.(string), path: path.(string)}, nil
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}
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func (ac *accessController) Authorized(ctx context.Context, accessRecords ...auth.Access) (context.Context, error) {
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req, err := dcontext.GetRequest(ctx)
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if err != nil {
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return nil, err
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}
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username, password, ok := req.BasicAuth()
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if !ok {
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return nil, &challenge{
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realm: ac.realm,
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err: auth.ErrInvalidCredential,
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}
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}
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// Dynamically parsing the latest account list
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fstat, err := os.Stat(ac.path)
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if err != nil {
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return nil, err
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}
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lastModified := fstat.ModTime()
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ac.mu.Lock()
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if ac.htpasswd == nil || !ac.modtime.Equal(lastModified) {
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ac.modtime = lastModified
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f, err := os.Open(ac.path)
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if err != nil {
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ac.mu.Unlock()
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return nil, err
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}
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defer f.Close()
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h, err := newHTPasswd(f)
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if err != nil {
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ac.mu.Unlock()
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return nil, err
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}
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ac.htpasswd = h
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}
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localHTPasswd := ac.htpasswd
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ac.mu.Unlock()
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if err := localHTPasswd.authenticateUser(username, password); err != nil {
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dcontext.GetLogger(ctx).Errorf("error authenticating user %q: %v", username, err)
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return nil, &challenge{
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realm: ac.realm,
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err: auth.ErrAuthenticationFailure,
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}
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}
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return auth.WithUser(ctx, auth.UserInfo{Name: username}), nil
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}
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// challenge implements the auth.Challenge interface.
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type challenge struct {
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realm string
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err error
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}
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var _ auth.Challenge = challenge{}
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// SetHeaders sets the basic challenge header on the response.
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func (ch challenge) SetHeaders(w http.ResponseWriter) {
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w.Header().Set("WWW-Authenticate", fmt.Sprintf("Basic realm=%q", ch.realm))
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}
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func (ch challenge) Error() string {
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return fmt.Sprintf("basic authentication challenge for realm %q: %s", ch.realm, ch.err)
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}
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func init() {
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auth.Register("htpasswd", auth.InitFunc(newAccessController))
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}
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