Use ErrNotImplemented in default refresh implementation

CHANGELOG.md

@@ -4,10 +4,16 @@
 
 ## Important Notes
 
+- [#1086](https://github.com/oauth2-proxy/oauth2-proxy/pull/1086) The extra validation to protect invalid session
+  deserialization from v6.0.0 (only) has been removed to improve performance. If you are on v6.0.0, either upgrade
+  to a version before this first and allow legacy sessions to expire gracefully or change your `cookie-secret`
+  value and force all sessions to reauthenticate.
+
 ## Breaking Changes
 
 ## Changes since v7.1.3
 
+- [#1086](https://github.com/oauth2-proxy/oauth2-proxy/pull/1086) Refresh sessions before token expiration if configured (@NickMeves)
 - [#1226](https://github.com/oauth2-proxy/oauth2-proxy/pull/1226) Move app redirection logic to its own package (@JoelSpeed)
 - [#1128](https://github.com/oauth2-proxy/oauth2-proxy/pull/1128) Use gorilla mux for OAuth Proxy routing (@JoelSpeed)
 - [#1238](https://github.com/oauth2-proxy/oauth2-proxy/pull/1238) Added ADFS provider (@samirachoadi)

pkg/middleware/stored_session.go

@@ -11,19 +11,20 @@ import (
 	middlewareapi "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/middleware"
 	sessionsapi "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/logger"
+	"github.com/oauth2-proxy/oauth2-proxy/v7/providers"
 )
 
-// StoredSessionLoaderOptions cotnains all of the requirements to construct
+// StoredSessionLoaderOptions contains all of the requirements to construct
 // a stored session loader.
 // All options must be provided.
 type StoredSessionLoaderOptions struct {
-	// Session storage basckend
+	// Session storage backend
 	SessionStore sessionsapi.SessionStore
 
 	// How often should sessions be refreshed
 	RefreshPeriod time.Duration
 
-	// Provider based sesssion refreshing
+	// Provider based session refreshing
 	RefreshSession func(context.Context, *sessionsapi.SessionState) (bool, error)
 
 	// Provider based session validation.
@@ -115,7 +116,7 @@ func (s *storedSessionLoader) refreshSessionIfNeeded(rw http.ResponseWriter, req
 		return nil
 	}
 
-	logger.Printf("Refreshing %s old session cookie for %s (refresh after %s)", session.Age(), session, s.refreshPeriod)
+	logger.Printf("Refreshing session - User: %s; SessionAge: %s", session.User, session.Age())
 	err := s.refreshSession(rw, req, session)
 	if err != nil {
 		// If a preemptive refresh fails, we still keep the session
@@ -131,21 +132,27 @@ func (s *storedSessionLoader) refreshSessionIfNeeded(rw http.ResponseWriter, req
 // and will save the session if it was updated.
 func (s *storedSessionLoader) refreshSession(rw http.ResponseWriter, req *http.Request, session *sessionsapi.SessionState) error {
 	refreshed, err := s.sessionRefresher(req.Context(), session)
-	if err != nil {
+	if err != nil && !errors.Is(err, providers.ErrNotImplemented) {
 		return fmt.Errorf("error refreshing tokens: %v", err)
 	}
 
+	// HACK:
+	// Providers that don't implement `RefreshSession` use the default
+	// implementation which returns `ErrNotImplemented`.
+	// Pretend it refreshed to reset the refresh timer so that `ValidateSession`
+	// isn't triggered every subsequent request and is only called once during
+	// this request.
+	if errors.Is(err, providers.ErrNotImplemented) {
+		refreshed = true
+	}
+
+	// Session not refreshed, nothing to persist.
 	if !refreshed {
 		return nil
 	}
 
 	// If we refreshed, update the `CreatedAt` time to reset the refresh timer
-	//
-	// HACK:
-	// Providers that don't implement `RefreshSession` use the default
-	// implementation. It always returns `refreshed == true`, so the
-	// `session.CreatedAt` is updated and doesn't trigger `ValidateSession`
-	// every subsequent request.
+	// (In case underlying provider implementations forget)
 	session.CreatedAtNow()
 
 	// Because the session was refreshed, make sure to save it

pkg/middleware/stored_session_test.go

@@ -11,6 +11,7 @@ import (
 	middlewareapi "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/middleware"
 	sessionsapi "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/clock"
+	"github.com/oauth2-proxy/oauth2-proxy/v7/providers"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/ginkgo/extensions/table"
 	. "github.com/onsi/gomega"
@@ -18,8 +19,9 @@ import (
 
 var _ = Describe("Stored Session Suite", func() {
 	const (
-		refresh   = "Refresh"
-		noRefresh = "NoRefresh"
+		refresh        = "Refresh"
+		noRefresh      = "NoRefresh"
+		notImplemented = "NotImplemented"
 	)
 
 	var ctx = context.Background()
@@ -293,6 +295,8 @@ var _ = Describe("Stored Session Suite", func() {
 							return true, nil
 						case noRefresh:
 							return false, nil
+						case notImplemented:
+							return false, providers.ErrNotImplemented
 						default:
 							return false, errors.New("error refreshing session")
 						}
@@ -364,6 +368,16 @@ var _ = Describe("Stored Session Suite", func() {
 				expectRefreshed: true,
 				expectValidated: true,
 			}),
+			Entry("when the provider doesn't implement refresh but validation succeeds", refreshSessionIfNeededTableInput{
+				refreshPeriod: 1 * time.Minute,
+				session: &sessionsapi.SessionState{
+					RefreshToken: notImplemented,
+					CreatedAt:    &createdPast,
+				},
+				expectedErr:     nil,
+				expectRefreshed: true,
+				expectValidated: true,
+			}),
 			Entry("when the provider refresh fails but validation succeeds", refreshSessionIfNeededTableInput{
 				refreshPeriod: 1 * time.Minute,
 				session: &sessionsapi.SessionState{
@@ -418,6 +432,8 @@ var _ = Describe("Stored Session Suite", func() {
 							return true, nil
 						case noRefresh:
 							return false, nil
+						case notImplemented:
+							return false, providers.ErrNotImplemented
 						default:
 							return false, errors.New("error refreshing session")
 						}
@@ -448,6 +464,13 @@ var _ = Describe("Stored Session Suite", func() {
 				expectedErr: nil,
 				expectSaved: true,
 			}),
+			Entry("when the provider doesn't implement refresh", refreshSessionWithProviderTableInput{
+				session: &sessionsapi.SessionState{
+					RefreshToken: notImplemented,
+				},
+				expectedErr: nil,
+				expectSaved: true,
+			}),
 			Entry("when the provider returns an error", refreshSessionWithProviderTableInput{
 				session: &sessionsapi.SessionState{
 					RefreshToken: "RefreshError",

providers/provider_default.go

@@ -130,19 +130,8 @@ func (p *ProviderData) ValidateSession(ctx context.Context, s *sessions.SessionS
 }
 
 // RefreshSession refreshes the user's session
-func (p *ProviderData) RefreshSession(_ context.Context, s *sessions.SessionState) (bool, error) {
-	if s == nil {
-		return false, nil
-	}
-
-	// HACK:
-	// Pretend `RefreshSession` occurred so `ValidateSession` isn't called
-	// on every request after any potential set refresh period elapses.
-	// See `middleware.refreshSession` for detailed logic & explanation.
-	//
-	// Intentionally doesn't use `ErrNotImplemented` since all providers will
-	// call this and we don't want to force them to implement this dummy logic.
-	return true, nil
+func (p *ProviderData) RefreshSession(_ context.Context, _ *sessions.SessionState) (bool, error) {
+	return false, ErrNotImplemented
 }
 
 // CreateSessionFromToken converts Bearer IDTokens into sessions

providers/provider_default_test.go

@@ -22,12 +22,12 @@ func TestRefresh(t *testing.T) {
 	ss.SetExpiresOn(expires)
 
 	refreshed, err := p.RefreshSession(context.Background(), ss)
-	assert.True(t, refreshed)
-	assert.NoError(t, err)
+	assert.False(t, refreshed)
+	assert.Equal(t, ErrNotImplemented, err)
 
 	refreshed, err = p.RefreshSession(context.Background(), nil)
 	assert.False(t, refreshed)
-	assert.NoError(t, err)
+	assert.Equal(t, ErrNotImplemented, err)
 }
 
 func TestAcrValuesNotConfigured(t *testing.T) {