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// Package htpasswd provides a simple authentication scheme that checks for the
// user credential hash in an htpasswd formatted file in a configuration-determined
// location.
//
// This authentication method MUST be used under TLS, as simple token-replay attack is possible.
package htpasswd
import (
"fmt"
"net/http"
"os"
"sync"
"time"
"github.com/docker/distribution/context"
"github.com/docker/distribution/registry/auth"
)
type accessController struct {
realm string
path string
modtime time.Time
mu sync.Mutex
htpasswd *htpasswd
}
var _ auth.AccessController = &accessController{}
func newAccessController(options map[string]interface{}) (auth.AccessController, error) {
realm, present := options["realm"]
if _, ok := realm.(string); !present || !ok {
return nil, fmt.Errorf(`"realm" must be set for htpasswd access controller`)
}
path, present := options["path"]
if _, ok := path.(string); !present || !ok {
return nil, fmt.Errorf(`"path" must be set for htpasswd access controller`)
}
return &accessController{realm: realm.(string), path: path.(string)}, nil
}
func (ac *accessController) Authorized(ctx context.Context, accessRecords ...auth.Access) (context.Context, error) {
req, err := context.GetRequest(ctx)
if err != nil {
return nil, err
}
username, password, ok := req.BasicAuth()
if !ok {
return nil, &challenge{
realm: ac.realm,
err: auth.ErrInvalidCredential,
}
}
// Dynamically parsing the latest account list
fstat, err := os.Stat(ac.path)
if err != nil {
return nil, err
}
lastModified := fstat.ModTime()
ac.mu.Lock()
if ac.htpasswd == nil || !ac.modtime.Equal(lastModified) {
ac.modtime = lastModified
f, err := os.Open(ac.path)
if err != nil {
ac.mu.Unlock()
return nil, err
}
defer f.Close()
h, err := newHTPasswd(f)
if err != nil {
ac.mu.Unlock()
return nil, err
}
ac.htpasswd = h
}
localHTPasswd := ac.htpasswd
ac.mu.Unlock()
if err := localHTPasswd.authenticateUser(username, password); err != nil {
context.GetLogger(ctx).Errorf("error authenticating user %q: %v", username, err)
return nil, &challenge{
realm: ac.realm,
err: auth.ErrAuthenticationFailure,
}
}
return auth.WithUser(ctx, auth.UserInfo{Name: username}), nil
}
// challenge implements the auth.Challenge interface.
type challenge struct {
realm string
err error
}
var _ auth.Challenge = challenge{}
// SetHeaders sets the basic challenge header on the response.
func (ch challenge) SetHeaders(w http.ResponseWriter) {
w.Header().Set("WWW-Authenticate", fmt.Sprintf("Basic realm=%q", ch.realm))
}
func (ch challenge) Error() string {
return fmt.Sprintf("basic authentication challenge for realm %q: %s", ch.realm, ch.err)
}
func init() {
auth.Register("htpasswd", auth.InitFunc(newAccessController))
}