feat: integrate openID auth logic and user profile management (#1381)

This change introduces OpenID authn by using providers such as Github,
Gitlab, Google and Dex.
User sessions are now used for web clients to identify
and persist an authenticated users session, thus not requiring every request to
use credentials.
Another change is apikey feature, users can create/revoke their api keys and use them
to authenticate when using cli clients such as skopeo.

eg:
login:
/auth/login?provider=github
/auth/login?provider=gitlab
and so on

logout:
/auth/logout

redirectURL:
/auth/callback/github
/auth/callback/gitlab
and so on

If network policy doesn't allow inbound connections, this callback wont work!

for more info read documentation added in this commit.

Signed-off-by: Alex Stan <alexandrustan96@yahoo.ro>
Signed-off-by: Petu Eusebiu <peusebiu@cisco.com>
Co-authored-by: Alex Stan <alexandrustan96@yahoo.ro>

pkg/api/controller.go

@@ -16,6 +16,8 @@ import (
 
 	"github.com/gorilla/handlers"
 	"github.com/gorilla/mux"
+	"github.com/gorilla/sessions"
+	"github.com/zitadel/oidc/pkg/client/rp"
 
 	"zotregistry.io/zot/errors"
 	"zotregistry.io/zot/pkg/api/config"
@@ -31,6 +33,7 @@ import (
 const (
 	idleTimeout       = 120 * time.Second
 	readHeaderTimeout = 5 * time.Second
+	cookiesMaxAge     = 86400 // seconds
 )
 
 type Controller struct {
@@ -44,6 +47,8 @@ type Controller struct {
 	Metrics         monitoring.MetricServer
 	CveInfo         ext.CveInfo
 	SyncOnDemand    SyncOnDemand
+	RelyingParties  map[string]rp.RelyingParty
+	CookieStore     sessions.Store
 	// runtime params
 	chosenPort int // kernel-chosen port
 }
@@ -254,7 +259,9 @@ func (c *Controller) InitImageStore() error {
 }
 
 func (c *Controller) InitRepoDB(reloadCtx context.Context) error {
-	if c.Config.Extensions != nil && c.Config.Extensions.Search != nil && *c.Config.Extensions.Search.Enable {
+	// init repoDB if search is enabled or authn enabled (need to store user profiles) or apikey ext is enabled
+	if (c.Config.Extensions != nil && c.Config.Extensions.Search != nil && *c.Config.Extensions.Search.Enable) ||
+		isAuthnEnabled(c.Config) || isOpenIDAuthEnabled(c.Config) || isAPIKeyEnabled(c.Config) {
 		driver, err := repodbfactory.New(c.Config.Storage.StorageConfig, c.Log) //nolint:contextcheck
 		if err != nil {
 			return err