113 lines
3 KiB
Go
113 lines
3 KiB
Go
// Package basic 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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// The use of SHA hashes (htpasswd -s) is enforced since MD5 is insecure and simple
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// system crypt() may be as well.
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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 basic
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import (
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"encoding/base64"
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"errors"
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"fmt"
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"net/http"
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"strings"
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ctxu "github.com/docker/distribution/context"
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"github.com/docker/distribution/registry/auth"
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"golang.org/x/net/context"
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)
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type accessController struct {
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realm string
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htpasswd *HTPasswd
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}
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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.AccessController = &accessController{}
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var (
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// ErrPasswordRequired - returned when no auth token is given.
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ErrPasswordRequired = errors.New("authorization credential required")
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// ErrInvalidCredential - returned when the auth token does not authenticate correctly.
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ErrInvalidCredential = errors.New("invalid authorization credential")
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)
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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 basic 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 basic access controller`)
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}
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return &accessController{realm: realm.(string), htpasswd: NewHTPasswd(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 := ctxu.GetRequest(ctx)
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if err != nil {
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return nil, err
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}
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authHeader := req.Header.Get("Authorization")
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if authHeader == "" {
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challenge := challenge{
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realm: ac.realm,
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}
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return nil, &challenge
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}
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parts := strings.Split(req.Header.Get("Authorization"), " ")
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challenge := challenge{
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realm: ac.realm,
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}
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if len(parts) != 2 || strings.ToLower(parts[0]) != "basic" {
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challenge.err = ErrPasswordRequired
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return nil, &challenge
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}
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text, err := base64.StdEncoding.DecodeString(parts[1])
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if err != nil {
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challenge.err = ErrInvalidCredential
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return nil, &challenge
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}
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credential := strings.Split(string(text), ":")
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if len(credential) != 2 {
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challenge.err = ErrInvalidCredential
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return nil, &challenge
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}
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if res, _ := ac.htpasswd.AuthenticateUser(credential[0], credential[1]); !res {
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challenge.err = ErrInvalidCredential
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return nil, &challenge
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}
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return auth.WithUser(ctx, auth.UserInfo{Name: credential[0]}), nil
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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("Basic realm=%q", ch.realm)
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w.Header().Set("WWW-Authenticate", 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("basic authentication challenge: %#v", ch)
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}
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func init() {
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auth.Register("basic", auth.InitFunc(newAccessController))
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}
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