Centralize Ticket management of persistent stores (#682)

* Centralize Ticket management of persistent stores

persistence package with Manager & Ticket will handle
all the details about keys, secrets, ticket into cookies,
etc. Persistent stores just need to pass Save, Load &
Clear function handles to the persistent manager now.

* Shift to persistence.Manager wrapping a persistence.Store

* Break up the Redis client builder logic

* Move error messages to Store from Manager

* Convert ticket to private for Manager use only

* Add persistence Manager & ticket tests

* Make a custom MockStore that handles time FastForwards

CHANGELOG.md

@@ -11,6 +11,7 @@
 
 ## Changes since v6.0.0
 
+- [#682](https://github.com/oauth2-proxy/oauth2-proxy/pull/682) Refactor persistent session store session ticket management (@NickMeves)
 - [#688](https://github.com/oauth2-proxy/oauth2-proxy/pull/688) Refactor session loading to make use of middleware pattern (@JoelSpeed)
 - [#593](https://github.com/oauth2-proxy/oauth2-proxy/pull/593) Integrate upstream package with OAuth2 Proxy (@JoelSpeed)
 - [#687](https://github.com/oauth2-proxy/oauth2-proxy/pull/687) Refactor HTPasswd Validator (@JoelSpeed)

pkg/apis/sessions/legacy_v5_tester.go

@@ -9,6 +9,8 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+const LegacyV5TestSecret = "0123456789abcdefghijklmnopqrstuv"
+
 // LegacyV5TestCase provides V5 JSON based test cases for legacy fallback code
 type LegacyV5TestCase struct {
 	Input  string
@@ -22,8 +24,6 @@ type LegacyV5TestCase struct {
 //
 // TODO: Remove when this is deprecated (likely V7)
 func CreateLegacyV5TestCases(t *testing.T) (map[string]LegacyV5TestCase, encryption.Cipher, encryption.Cipher) {
-	const secret = "0123456789abcdefghijklmnopqrstuv"
-
 	created := time.Now()
 	createdJSON, err := created.MarshalJSON()
 	assert.NoError(t, err)
@@ -33,7 +33,7 @@ func CreateLegacyV5TestCases(t *testing.T) (map[string]LegacyV5TestCase, encrypt
 	assert.NoError(t, err)
 	eString := string(eJSON)
 
-	cfbCipher, err := encryption.NewCFBCipher([]byte(secret))
+	cfbCipher, err := encryption.NewCFBCipher([]byte(LegacyV5TestSecret))
 	assert.NoError(t, err)
 	legacyCipher := encryption.NewBase64Cipher(cfbCipher)
 

pkg/sessions/persistence/interfaces.go

@@ -0,0 +1,15 @@
+package persistence
+
+import (
+	"context"
+	"time"
+)
+
+// Store is used for persistent session stores (IE not Cookie)
+// Implementing this interface allows it to easily use the persistence.Manager
+// for session ticket + encryption details.
+type Store interface {
+	Save(context.Context, string, []byte, time.Duration) error
+	Load(context.Context, string) ([]byte, error)
+	Clear(context.Context, string) error
+}

pkg/sessions/persistence/manager.go

@@ -0,0 +1,91 @@
+package persistence
+
+import (
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/apis/options"
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/apis/sessions"
+)
+
+// Manager wraps a Store and handles the implementation details of the
+// sessions.SessionStore with its use of session tickets
+type Manager struct {
+	Store   Store
+	Options *options.Cookie
+}
+
+// NewManager creates a Manager that can wrap a Store and manage the
+// sessions.SessionStore implementation details
+func NewManager(store Store, cookieOpts *options.Cookie) *Manager {
+	return &Manager{
+		Store:   store,
+		Options: cookieOpts,
+	}
+}
+
+// Save saves a session in a persistent Store. Save will generate (or reuse an
+// existing) ticket which manages unique per session encryption & retrieval
+// from the persistent data store.
+func (m *Manager) Save(rw http.ResponseWriter, req *http.Request, s *sessions.SessionState) error {
+	if s.CreatedAt == nil || s.CreatedAt.IsZero() {
+		now := time.Now()
+		s.CreatedAt = &now
+	}
+
+	tckt, err := decodeTicketFromRequest(req, m.Options)
+	if err != nil {
+		tckt, err = newTicket(m.Options)
+		if err != nil {
+			return fmt.Errorf("error creating a session ticket: %v", err)
+		}
+	}
+
+	err = tckt.saveSession(s, func(key string, val []byte, exp time.Duration) error {
+		return m.Store.Save(req.Context(), key, val, exp)
+	})
+	if err != nil {
+		return err
+	}
+	tckt.setCookie(rw, req, s)
+
+	return nil
+}
+
+// Load reads sessions.SessionState information from a session store. It will
+// use the session ticket from the http.Request's cookie.
+func (m *Manager) Load(req *http.Request) (*sessions.SessionState, error) {
+	tckt, err := decodeTicketFromRequest(req, m.Options)
+	if err != nil {
+		return nil, err
+	}
+
+	return tckt.loadSession(func(key string) ([]byte, error) {
+		return m.Store.Load(req.Context(), key)
+	})
+}
+
+// Clear clears any saved session information for a given ticket cookie.
+// Then it clears all session data for that ticket in the Store.
+func (m *Manager) Clear(rw http.ResponseWriter, req *http.Request) error {
+	tckt, err := decodeTicketFromRequest(req, m.Options)
+	if err != nil {
+		// Always clear the cookie, even when we can't load a cookie from
+		// the request
+		tckt = &ticket{
+			options: m.Options,
+		}
+		tckt.clearCookie(rw, req)
+		// Don't raise an error if we didn't have a Cookie
+		if err == http.ErrNoCookie {
+			return nil
+		}
+		return fmt.Errorf("error decoding ticket to clear session: %v", err)
+	}
+
+	tckt.clearCookie(rw, req)
+	return tckt.clearSession(func(key string) error {
+		return m.Store.Clear(req.Context(), key)
+	})
+}

pkg/sessions/persistence/manager_test.go

@@ -0,0 +1,34 @@
+package persistence
+
+import (
+	"testing"
+	"time"
+
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/apis/options"
+	sessionsapi "github.com/oauth2-proxy/oauth2-proxy/pkg/apis/sessions"
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/logger"
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/sessions/tests"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+func TestManager(t *testing.T) {
+	logger.SetOutput(GinkgoWriter)
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Persistence Manager SessionStore")
+}
+
+var _ = Describe("Persistence Manager SessionStore Tests", func() {
+	var ms *tests.MockStore
+	BeforeEach(func() {
+		ms = tests.NewMockStore()
+	})
+	tests.RunSessionStoreTests(
+		func(_ *options.SessionOptions, cookieOpts *options.Cookie) (sessionsapi.SessionStore, error) {
+			return NewManager(ms, cookieOpts), nil
+		},
+		func(d time.Duration) error {
+			ms.FastForward(d)
+			return nil
+		})
+})

pkg/sessions/persistence/ticket.go

@@ -0,0 +1,221 @@
+package persistence
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"encoding/base64"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/apis/options"
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/apis/sessions"
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/cookies"
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/encryption"
+)
+
+// saveFunc performs a persistent store's save functionality using
+// a key string, value []byte & (optional) expiration time.Duration
+type saveFunc func(string, []byte, time.Duration) error
+
+// loadFunc performs a load from a persistent store using a
+// string key and returning the stored value as []byte
+type loadFunc func(string) ([]byte, error)
+
+// clearFunc performs a persistent store's clear functionality using
+// a string key for the target of the deletion.
+type clearFunc func(string) error
+
+// ticket is a structure representing the ticket used in server based
+// session storage. It provides a unique per session decryption secret giving
+// more security than the shared CookieSecret.
+type ticket struct {
+	id      string
+	secret  []byte
+	options *options.Cookie
+}
+
+// newTicket creates a new ticket. The ID & secret will be randomly created
+// with 16 byte sizes. The ID will be prefixed & hex encoded.
+func newTicket(cookieOpts *options.Cookie) (*ticket, error) {
+	rawID := make([]byte, 16)
+	if _, err := io.ReadFull(rand.Reader, rawID); err != nil {
+		return nil, fmt.Errorf("failed to create new ticket ID: %v", err)
+	}
+	// ticketID is hex encoded
+	ticketID := fmt.Sprintf("%s-%s", cookieOpts.Name, hex.EncodeToString(rawID))
+
+	secret := make([]byte, aes.BlockSize)
+	if _, err := io.ReadFull(rand.Reader, secret); err != nil {
+		return nil, fmt.Errorf("failed to create encryption secret: %v", err)
+	}
+
+	return &ticket{
+		id:      ticketID,
+		secret:  secret,
+		options: cookieOpts,
+	}, nil
+}
+
+// encodeTicket encodes the Ticket to a string for usage in cookies
+func (t *ticket) encodeTicket() string {
+	return fmt.Sprintf("%s.%s", t.id, base64.RawURLEncoding.EncodeToString(t.secret))
+}
+
+// decodeTicket decodes an encoded ticket string
+func decodeTicket(encTicket string, cookieOpts *options.Cookie) (*ticket, error) {
+	ticketParts := strings.Split(encTicket, ".")
+	if len(ticketParts) != 2 {
+		return nil, errors.New("failed to decode ticket")
+	}
+	ticketID, secretBase64 := ticketParts[0], ticketParts[1]
+
+	secret, err := base64.RawURLEncoding.DecodeString(secretBase64)
+	if err != nil {
+		return nil, fmt.Errorf("failed to decode encryption secret: %v", err)
+	}
+
+	return &ticket{
+		id:      ticketID,
+		secret:  secret,
+		options: cookieOpts,
+	}, nil
+}
+
+// decodeTicketFromRequest retrieves a potential ticket cookie from a request
+// and decodes it to a ticket.
+func decodeTicketFromRequest(req *http.Request, cookieOpts *options.Cookie) (*ticket, error) {
+	requestCookie, err := req.Cookie(cookieOpts.Name)
+	if err != nil {
+		// Don't wrap this error to allow `err == http.ErrNoCookie` checks
+		return nil, err
+	}
+
+	// An existing cookie exists, try to retrieve the ticket
+	val, _, ok := encryption.Validate(requestCookie, cookieOpts.Secret, cookieOpts.Expire)
+	if !ok {
+		return nil, fmt.Errorf("session ticket cookie failed validation: %v", err)
+	}
+
+	// Valid cookie, decode the ticket
+	return decodeTicket(string(val), cookieOpts)
+}
+
+// saveSession encodes the SessionState with the ticket's secret and persists
+// it to disk via the passed saveFunc.
+func (t *ticket) saveSession(s *sessions.SessionState, saver saveFunc) error {
+	c, err := t.makeCipher()
+	if err != nil {
+		return err
+	}
+	ciphertext, err := s.EncodeSessionState(c, false)
+	if err != nil {
+		return fmt.Errorf("failed to encode the session state with the ticket: %v", err)
+	}
+	return saver(t.id, ciphertext, t.options.Expire)
+}
+
+// loadSession loads a session from the disk store via the passed loadFunc
+// using the ticket.id as the key. It then decodes the SessionState using
+// ticket.secret to make the AES-GCM cipher.
+//
+// TODO (@NickMeves): Remove legacyV5LoadSession support in V7
+func (t *ticket) loadSession(loader loadFunc) (*sessions.SessionState, error) {
+	ciphertext, err := loader(t.id)
+	if err != nil {
+		return nil, fmt.Errorf("failed to load the session state with the ticket: %v", err)
+	}
+	c, err := t.makeCipher()
+	if err != nil {
+		return nil, err
+	}
+	ss, err := sessions.DecodeSessionState(ciphertext, c, false)
+	if err != nil {
+		return t.legacyV5LoadSession(ciphertext)
+	}
+	return ss, nil
+}
+
+// clearSession uses the passed clearFunc to delete a session stored with a
+// key of ticket.id
+func (t *ticket) clearSession(clearer clearFunc) error {
+	return clearer(t.id)
+}
+
+// setCookie sets the encoded ticket as a cookie
+func (t *ticket) setCookie(rw http.ResponseWriter, req *http.Request, s *sessions.SessionState) {
+	ticketCookie := t.makeCookie(
+		req,
+		t.encodeTicket(),
+		t.options.Expire,
+		*s.CreatedAt,
+	)
+
+	http.SetCookie(rw, ticketCookie)
+}
+
+// clearCookie removes any cookies that would be where this ticket
+// would set them
+func (t *ticket) clearCookie(rw http.ResponseWriter, req *http.Request) {
+	clearCookie := t.makeCookie(
+		req,
+		"",
+		time.Hour*-1,
+		time.Now(),
+	)
+	http.SetCookie(rw, clearCookie)
+}
+
+// makeCookie makes a cookie, signing the value if present
+func (t *ticket) makeCookie(req *http.Request, value string, expires time.Duration, now time.Time) *http.Cookie {
+	if value != "" {
+		value = encryption.SignedValue(t.options.Secret, t.options.Name, []byte(value), now)
+	}
+	return cookies.MakeCookieFromOptions(
+		req,
+		t.options.Name,
+		value,
+		t.options,
+		expires,
+		now,
+	)
+}
+
+// makeCipher makes a AES-GCM cipher out of the ticket's secret
+func (t *ticket) makeCipher() (encryption.Cipher, error) {
+	c, err := encryption.NewGCMCipher(t.secret)
+	if err != nil {
+		return nil, fmt.Errorf("failed to make an AES-GCM cipher from the ticket secret: %v", err)
+	}
+	return c, nil
+}
+
+// legacyV5LoadSession loads a Redis session created in V5 with historical logic
+//
+// TODO (@NickMeves): Remove in V7
+func (t *ticket) legacyV5LoadSession(resultBytes []byte) (*sessions.SessionState, error) {
+	block, err := aes.NewCipher(t.secret)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create a legacy AES-CFB cipher from the ticket secret: %v", err)
+	}
+
+	stream := cipher.NewCFBDecrypter(block, t.secret)
+	stream.XORKeyStream(resultBytes, resultBytes)
+
+	cfbCipher, err := encryption.NewCFBCipher(encryption.SecretBytes(t.options.Secret))
+	if err != nil {
+		return nil, err
+	}
+	legacyCipher := encryption.NewBase64Cipher(cfbCipher)
+
+	session, err := sessions.LegacyV5DecodeSessionState(string(resultBytes), legacyCipher)
+	if err != nil {
+		return nil, err
+	}
+	return session, nil
+}

pkg/sessions/persistence/ticket_test.go

@@ -0,0 +1,223 @@
+package persistence
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io"
+	"testing"
+	"time"
+
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/apis/options"
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/apis/sessions"
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/logger"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/extensions/table"
+	. "github.com/onsi/gomega"
+)
+
+func Test_ticket(t *testing.T) {
+	logger.SetOutput(GinkgoWriter)
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Session Ticket")
+}
+
+var _ = Describe("Session Ticket Tests", func() {
+	Context("encodeTicket & decodeTicket", func() {
+		type ticketTableInput struct {
+			ticket        *ticket
+			encodedTicket string
+			expectedError error
+		}
+
+		DescribeTable("encodeTicket should decodeTicket back when valid",
+			func(in ticketTableInput) {
+				if in.ticket != nil {
+					enc := in.ticket.encodeTicket()
+					Expect(enc).To(Equal(in.encodedTicket))
+
+					dec, err := decodeTicket(enc, in.ticket.options)
+					Expect(err).ToNot(HaveOccurred())
+					Expect(dec).To(Equal(in.ticket))
+				} else {
+					_, err := decodeTicket(in.encodedTicket, nil)
+					Expect(err).To(MatchError(in.expectedError))
+				}
+			},
+			Entry("with a valid ticket", ticketTableInput{
+				ticket: &ticket{
+					id:     "dummy-0123456789abcdef",
+					secret: []byte("0123456789abcdef"),
+					options: &options.Cookie{
+						Name: "dummy",
+					},
+				},
+				encodedTicket: fmt.Sprintf("%s.%s",
+					"dummy-0123456789abcdef",
+					base64.RawURLEncoding.EncodeToString([]byte("0123456789abcdef"))),
+				expectedError: nil,
+			}),
+			Entry("with an invalid encoded ticket with 1 part", ticketTableInput{
+				ticket:        nil,
+				encodedTicket: "dummy-0123456789abcdef",
+				expectedError: errors.New("failed to decode ticket"),
+			}),
+			Entry("with an invalid base64 encoded secret", ticketTableInput{
+				ticket:        nil,
+				encodedTicket: "dummy-0123456789abcdef.@)#($*@)#(*$@)#(*$",
+				expectedError: fmt.Errorf("failed to decode encryption secret: illegal base64 data at input byte 0"),
+			}),
+		)
+	})
+
+	Context("saveSession", func() {
+		It("uses the passed save function", func() {
+			t, err := newTicket(&options.Cookie{Name: "dummy"})
+			Expect(err).ToNot(HaveOccurred())
+
+			c, err := t.makeCipher()
+			Expect(err).ToNot(HaveOccurred())
+
+			ss := &sessions.SessionState{User: "foobar"}
+			store := map[string][]byte{}
+			err = t.saveSession(ss, func(k string, v []byte, e time.Duration) error {
+				store[k] = v
+				return nil
+			})
+			Expect(err).ToNot(HaveOccurred())
+
+			stored, err := sessions.DecodeSessionState(store[t.id], c, false)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(stored).To(Equal(ss))
+		})
+
+		It("errors when the saveFunc errors", func() {
+			t, err := newTicket(&options.Cookie{Name: "dummy"})
+			Expect(err).ToNot(HaveOccurred())
+
+			err = t.saveSession(
+				&sessions.SessionState{User: "foobar"},
+				func(k string, v []byte, e time.Duration) error {
+					return errors.New("save error")
+				})
+			Expect(err).To(MatchError(errors.New("save error")))
+		})
+	})
+
+	Context("loadSession", func() {
+		It("uses the passed load function", func() {
+			t, err := newTicket(&options.Cookie{Name: "dummy"})
+			Expect(err).ToNot(HaveOccurred())
+
+			c, err := t.makeCipher()
+			Expect(err).ToNot(HaveOccurred())
+
+			ss := &sessions.SessionState{User: "foobar"}
+			loadedSession, err := t.loadSession(func(k string) ([]byte, error) {
+				return ss.EncodeSessionState(c, false)
+			})
+			Expect(err).ToNot(HaveOccurred())
+			Expect(loadedSession).To(Equal(ss))
+		})
+
+		It("errors when the loadFunc errors", func() {
+			t, err := newTicket(&options.Cookie{Name: "dummy"})
+			Expect(err).ToNot(HaveOccurred())
+
+			data, err := t.loadSession(func(k string) ([]byte, error) {
+				return nil, errors.New("load error")
+			})
+			Expect(data).To(BeNil())
+			Expect(err).To(MatchError(errors.New("failed to load the session state with the ticket: load error")))
+		})
+	})
+
+	Context("clearSession", func() {
+		It("uses the passed clear function", func() {
+			t, err := newTicket(&options.Cookie{Name: "dummy"})
+			Expect(err).ToNot(HaveOccurred())
+
+			var tracker string
+			err = t.clearSession(func(k string) error {
+				tracker = k
+				return nil
+			})
+			Expect(err).ToNot(HaveOccurred())
+			Expect(tracker).To(Equal(t.id))
+		})
+
+		It("errors when the clearFunc errors", func() {
+			t, err := newTicket(&options.Cookie{Name: "dummy"})
+			Expect(err).ToNot(HaveOccurred())
+
+			err = t.clearSession(func(k string) error {
+				return errors.New("clear error")
+			})
+			Expect(err).To(MatchError(errors.New("clear error")))
+		})
+	})
+})
+
+// TestLegacyV5DecodeSession tests the fallback to LegacyV5DecodeSession
+// when a V5 encoded session is in Redis
+//
+// TODO (@NickMeves): Remove when this is deprecated (likely V7)
+func Test_legacyV5LoadSession(t *testing.T) {
+	testCases, _, _ := sessions.CreateLegacyV5TestCases(t)
+
+	for testName, tc := range testCases {
+		t.Run(testName, func(t *testing.T) {
+			g := NewWithT(t)
+
+			secret := make([]byte, aes.BlockSize)
+			_, err := io.ReadFull(rand.Reader, secret)
+			g.Expect(err).ToNot(HaveOccurred())
+			tckt := &ticket{
+				secret: secret,
+				options: &options.Cookie{
+					Secret: base64.RawURLEncoding.EncodeToString([]byte(sessions.LegacyV5TestSecret)),
+				},
+			}
+
+			encrypted, err := legacyStoreValue(tc.Input, tckt.secret)
+			g.Expect(err).ToNot(HaveOccurred())
+
+			ss, err := tckt.legacyV5LoadSession(encrypted)
+			if tc.Error {
+				g.Expect(err).To(HaveOccurred())
+				g.Expect(ss).To(BeNil())
+				return
+			}
+			g.Expect(err).ToNot(HaveOccurred())
+
+			// Compare sessions without *time.Time fields
+			exp := *tc.Output
+			exp.CreatedAt = nil
+			exp.ExpiresOn = nil
+			act := *ss
+			act.CreatedAt = nil
+			act.ExpiresOn = nil
+			g.Expect(exp).To(Equal(act))
+		})
+	}
+}
+
+// legacyStoreValue implements the legacy V5 Redis persistence AES-CFB value encryption
+//
+// TODO (@NickMeves): Remove when this is deprecated (likely V7)
+func legacyStoreValue(value string, ticketSecret []byte) ([]byte, error) {
+	ciphertext := make([]byte, len(value))
+	block, err := aes.NewCipher(ticketSecret)
+	if err != nil {
+		return nil, fmt.Errorf("error initiating cipher block: %v", err)
+	}
+
+	// Use secret as the Initialization Vector too, because each entry has it's own key
+	stream := cipher.NewCFBEncrypter(block, ticketSecret)
+	stream.XORKeyStream(ciphertext, []byte(value))
+
+	return ciphertext, nil
+}

pkg/sessions/redis/redis_store.go

@@ -2,91 +2,113 @@ package redis
 
 import (
 	"context"
-	"crypto/aes"
-	"crypto/cipher"
-	"crypto/rand"
 	"crypto/x509"
-	"encoding/base64"
-	"encoding/hex"
 	"fmt"
-	"io"
 	"io/ioutil"
-	"net/http"
-	"strings"
 	"time"
 
 	"github.com/go-redis/redis/v7"
 	"github.com/oauth2-proxy/oauth2-proxy/pkg/apis/options"
 	"github.com/oauth2-proxy/oauth2-proxy/pkg/apis/sessions"
-	"github.com/oauth2-proxy/oauth2-proxy/pkg/cookies"
-	"github.com/oauth2-proxy/oauth2-proxy/pkg/encryption"
 	"github.com/oauth2-proxy/oauth2-proxy/pkg/logger"
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/sessions/persistence"
 )
 
-// TicketData is a structure representing the ticket used in server session storage
-type TicketData struct {
-	TicketID string
-	Secret   []byte
-}
-
-// SessionStore is an implementation of the sessions.SessionStore
+// SessionStore is an implementation of the persistence.Store
 // interface that stores sessions in redis
 type SessionStore struct {
-	CookieCipher encryption.Cipher
-	Cookie       *options.Cookie
-	Client       Client
+	Client Client
 }
 
-// NewRedisSessionStore initialises a new instance of the SessionStore from
-// the configuration given
+// NewRedisSessionStore initialises a new instance of the SessionStore and wraps
+// it in a persistence.Manager
 func NewRedisSessionStore(opts *options.SessionOptions, cookieOpts *options.Cookie) (sessions.SessionStore, error) {
-	cfbCipher, err := encryption.NewCFBCipher(encryption.SecretBytes(cookieOpts.Secret))
-	if err != nil {
-		return nil, fmt.Errorf("error initialising cipher: %v", err)
-	}
-
-	client, err := newRedisCmdable(opts.Redis)
+	client, err := newRedisClient(opts.Redis)
 	if err != nil {
 		return nil, fmt.Errorf("error constructing redis client: %v", err)
 	}
 
 	rs := &SessionStore{
-		Client:       client,
-		CookieCipher: cfbCipher,
-		Cookie:       cookieOpts,
+		Client: client,
 	}
-	return rs, nil
-
+	return persistence.NewManager(rs, cookieOpts), nil
 }
 
-func newRedisCmdable(opts options.RedisStoreOptions) (Client, error) {
+// Save takes a sessions.SessionState and stores the information from it
+// to redies, and adds a new persistence cookie on the HTTP response writer
+func (store *SessionStore) Save(ctx context.Context, key string, value []byte, exp time.Duration) error {
+	err := store.Client.Set(ctx, key, value, exp)
+	if err != nil {
+		return fmt.Errorf("error saving redis session: %v", err)
+	}
+	return nil
+}
+
+// Load reads sessions.SessionState information from a persistence
+// cookie within the HTTP request object
+func (store *SessionStore) Load(ctx context.Context, key string) ([]byte, error) {
+	value, err := store.Client.Get(ctx, key)
+	if err != nil {
+		return nil, fmt.Errorf("error loading redis session: %v", err)
+	}
+	return value, nil
+}
+
+// Clear clears any saved session information for a given persistence cookie
+// from redis, and then clears the session
+func (store *SessionStore) Clear(ctx context.Context, key string) error {
+	err := store.Client.Del(ctx, key)
+	if err != nil {
+		return fmt.Errorf("error clearing the session from redis: %v", err)
+	}
+	return nil
+}
+
+// newRedisClient makes a redis.Client (either standalone, sentinel aware, or
+// redis cluster)
+func newRedisClient(opts options.RedisStoreOptions) (Client, error) {
 	if opts.UseSentinel && opts.UseCluster {
 		return nil, fmt.Errorf("options redis-use-sentinel and redis-use-cluster are mutually exclusive")
 	}
-
 	if opts.UseSentinel {
-		addrs, err := parseRedisURLs(opts.SentinelConnectionURLs)
-		if err != nil {
-			return nil, fmt.Errorf("could not parse redis urls: %v", err)
-		}
-		client := redis.NewFailoverClient(&redis.FailoverOptions{
-			MasterName:    opts.SentinelMasterName,
-			SentinelAddrs: addrs,
-		})
-		return newClient(client), nil
+		return buildSentinelClient(opts)
 	}
-
 	if opts.UseCluster {
-		addrs, err := parseRedisURLs(opts.ClusterConnectionURLs)
-		if err != nil {
-			return nil, fmt.Errorf("could not parse redis urls: %v", err)
-		}
-		client := redis.NewClusterClient(&redis.ClusterOptions{
-			Addrs: addrs,
-		})
-		return newClusterClient(client), nil
+		return buildClusterClient(opts)
 	}
 
+	return buildStandaloneClient(opts)
+}
+
+// buildSentinelClient makes a redis.Client that connects to Redis Sentinel
+// for Primary/Replica Redis node coordination
+func buildSentinelClient(opts options.RedisStoreOptions) (Client, error) {
+	addrs, err := parseRedisURLs(opts.SentinelConnectionURLs)
+	if err != nil {
+		return nil, fmt.Errorf("could not parse redis urls: %v", err)
+	}
+	client := redis.NewFailoverClient(&redis.FailoverOptions{
+		MasterName:    opts.SentinelMasterName,
+		SentinelAddrs: addrs,
+	})
+	return newClient(client), nil
+}
+
+// buildClusterClient makes a redis.Client that is Redis Cluster aware
+func buildClusterClient(opts options.RedisStoreOptions) (Client, error) {
+	addrs, err := parseRedisURLs(opts.ClusterConnectionURLs)
+	if err != nil {
+		return nil, fmt.Errorf("could not parse redis urls: %v", err)
+	}
+	client := redis.NewClusterClient(&redis.ClusterOptions{
+		Addrs: addrs,
+	})
+	return newClusterClient(client), nil
+}
+
+// buildStandaloneClient makes a redis.Client that connects to a simple
+// Redis node
+func buildStandaloneClient(opts options.RedisStoreOptions) (Client, error) {
 	opt, err := redis.ParseURL(opts.ConnectionURL)
 	if err != nil {
 		return nil, fmt.Errorf("unable to parse redis url: %s", err)
@@ -134,261 +156,3 @@ func parseRedisURLs(urls []string) ([]string, error) {
 	}
 	return addrs, nil
 }
-
-// Save takes a sessions.SessionState and stores the information from it
-// to redies, and adds a new ticket cookie on the HTTP response writer
-func (store *SessionStore) Save(rw http.ResponseWriter, req *http.Request, s *sessions.SessionState) error {
-	if s.CreatedAt == nil || s.CreatedAt.IsZero() {
-		now := time.Now()
-		s.CreatedAt = &now
-	}
-
-	// Old sessions that we are refreshing would have a request cookie
-	// New sessions don't, so we ignore the error. storeValue will check requestCookie
-	requestCookie, _ := req.Cookie(store.Cookie.Name)
-	ctx := req.Context()
-	ticketString, err := store.saveSession(ctx, s, store.Cookie.Expire, requestCookie)
-	if err != nil {
-		return err
-	}
-
-	ticketCookie := store.makeCookie(
-		req,
-		ticketString,
-		store.Cookie.Expire,
-		*s.CreatedAt,
-	)
-
-	http.SetCookie(rw, ticketCookie)
-	return nil
-}
-
-// Load reads sessions.SessionState information from a ticket
-// cookie within the HTTP request object
-func (store *SessionStore) Load(req *http.Request) (*sessions.SessionState, error) {
-	requestCookie, err := req.Cookie(store.Cookie.Name)
-	if err != nil {
-		return nil, fmt.Errorf("error loading session: %s", err)
-	}
-
-	val, _, ok := encryption.Validate(requestCookie, store.Cookie.Secret, store.Cookie.Expire)
-	if !ok {
-		return nil, fmt.Errorf("cookie signature not valid")
-	}
-	ctx := req.Context()
-	session, err := store.loadSessionFromTicket(ctx, string(val))
-	if err != nil {
-		return nil, fmt.Errorf("error loading session: %s", err)
-	}
-	return session, nil
-}
-
-// Clear clears any saved session information for a given ticket cookie
-// from redis, and then clears the session
-func (store *SessionStore) Clear(rw http.ResponseWriter, req *http.Request) error {
-	// We go ahead and clear the cookie first, always.
-	clearCookie := store.makeCookie(
-		req,
-		"",
-		time.Hour*-1,
-		time.Now(),
-	)
-	http.SetCookie(rw, clearCookie)
-
-	// If there was an existing cookie we should clear the session in redis
-	requestCookie, err := req.Cookie(store.Cookie.Name)
-	if err != nil && err == http.ErrNoCookie {
-		// No existing cookie so can't clear redis
-		return nil
-	} else if err != nil {
-		return fmt.Errorf("error retrieving cookie: %v", err)
-	}
-
-	val, _, ok := encryption.Validate(requestCookie, store.Cookie.Secret, store.Cookie.Expire)
-	if !ok {
-		return fmt.Errorf("cookie signature not valid")
-	}
-
-	// We only return an error if we had an issue with redis
-	// If there's an issue decoding the ticket, ignore it
-	ticket, _ := decodeTicket(store.Cookie.Name, string(val))
-	if ticket != nil {
-		ctx := req.Context()
-		err := store.Client.Del(ctx, ticket.asHandle(store.Cookie.Name))
-		if err != nil {
-			return fmt.Errorf("error clearing cookie from redis: %s", err)
-		}
-	}
-	return nil
-}
-
-// saveSession encodes a session with a GCM cipher & saves the data into Redis
-func (store *SessionStore) saveSession(ctx context.Context, s *sessions.SessionState, expiration time.Duration, requestCookie *http.Cookie) (string, error) {
-	ticket, err := store.getTicket(requestCookie)
-	if err != nil {
-		return "", fmt.Errorf("error getting ticket: %v", err)
-	}
-
-	c, err := encryption.NewGCMCipher(ticket.Secret)
-	if err != nil {
-		return "", fmt.Errorf("error initiating cipher block %s", err)
-	}
-
-	// Use AES-GCM since it provides authenticated encryption
-	// AES-CFB used in cookies has the cookie signing SHA to get around the lack of
-	// authentication in AES-CFB
-	ciphertext, err := s.EncodeSessionState(c, false)
-	if err != nil {
-		return "", err
-	}
-
-	handle := ticket.asHandle(store.Cookie.Name)
-	err = store.Client.Set(ctx, handle, ciphertext, expiration)
-	if err != nil {
-		return "", err
-	}
-	return ticket.encodeTicket(store.Cookie.Name), nil
-}
-
-// loadSessionFromTicket loads the session based on the ticket value
-func (store *SessionStore) loadSessionFromTicket(ctx context.Context, value string) (*sessions.SessionState, error) {
-	ticket, err := decodeTicket(store.Cookie.Name, value)
-	if err != nil {
-		return nil, err
-	}
-
-	resultBytes, err := store.Client.Get(ctx, ticket.asHandle(store.Cookie.Name))
-	if err != nil {
-		return nil, err
-	}
-
-	c, err := encryption.NewGCMCipher(ticket.Secret)
-	if err != nil {
-		return nil, err
-	}
-
-	session, err := sessions.DecodeSessionState(resultBytes, c, false)
-	if err != nil {
-		// The GCM cipher will error due to a legacy JSON payload not passing
-		// the authentication check part of AES GCM encryption.
-		// In that case, we can attempt to fallback to try a legacy load
-		legacyCipher := encryption.NewBase64Cipher(store.CookieCipher)
-		return legacyV5DecodeSession(resultBytes, ticket, legacyCipher)
-	}
-	return session, nil
-}
-
-// legacyV5DecodeSession loads the session based on the ticket value
-// This fallback uses V5 style encryption of Base64 + AES CFB
-func legacyV5DecodeSession(resultBytes []byte, ticket *TicketData, c encryption.Cipher) (*sessions.SessionState, error) {
-	block, err := aes.NewCipher(ticket.Secret)
-	if err != nil {
-		return nil, err
-	}
-	// Use secret as the IV too, because each entry has it's own key
-	stream := cipher.NewCFBDecrypter(block, ticket.Secret)
-	stream.XORKeyStream(resultBytes, resultBytes)
-
-	session, err := sessions.LegacyV5DecodeSessionState(string(resultBytes), c)
-	if err != nil {
-		return nil, err
-	}
-	return session, nil
-}
-
-// makeCookie makes a cookie, signing the value if present
-func (store *SessionStore) makeCookie(req *http.Request, value string, expires time.Duration, now time.Time) *http.Cookie {
-	if value != "" {
-		value = encryption.SignedValue(store.Cookie.Secret, store.Cookie.Name, []byte(value), now)
-	}
-	return cookies.MakeCookieFromOptions(
-		req,
-		store.Cookie.Name,
-		value,
-		store.Cookie,
-		expires,
-		now,
-	)
-}
-
-// getTicket retrieves an existing ticket from the cookie if present,
-// or creates a new ticket
-func (store *SessionStore) getTicket(requestCookie *http.Cookie) (*TicketData, error) {
-	if requestCookie == nil {
-		return newTicket()
-	}
-
-	// An existing cookie exists, try to retrieve the ticket
-	val, _, ok := encryption.Validate(requestCookie, store.Cookie.Secret, store.Cookie.Expire)
-	if !ok {
-		// Cookie is invalid, create a new ticket
-		return newTicket()
-	}
-
-	// Valid cookie, decode the ticket
-	ticket, err := decodeTicket(store.Cookie.Name, string(val))
-	if err != nil {
-		// If we can't decode the ticket we have to create a new one
-		return newTicket()
-	}
-	return ticket, nil
-}
-
-func newTicket() (*TicketData, error) {
-	rawID := make([]byte, 16)
-	if _, err := io.ReadFull(rand.Reader, rawID); err != nil {
-		return nil, fmt.Errorf("failed to create new ticket ID %s", err)
-	}
-	// ticketID is hex encoded
-	ticketID := hex.EncodeToString(rawID)
-
-	secret := make([]byte, aes.BlockSize)
-	if _, err := io.ReadFull(rand.Reader, secret); err != nil {
-		return nil, fmt.Errorf("failed to create initialization vector %s", err)
-	}
-	ticket := &TicketData{
-		TicketID: ticketID,
-		Secret:   secret,
-	}
-	return ticket, nil
-}
-
-func (ticket *TicketData) asHandle(prefix string) string {
-	return fmt.Sprintf("%s-%s", prefix, ticket.TicketID)
-}
-
-func decodeTicket(cookieName string, ticketString string) (*TicketData, error) {
-	prefix := cookieName + "-"
-	if !strings.HasPrefix(ticketString, prefix) {
-		return nil, fmt.Errorf("failed to decode ticket handle")
-	}
-	trimmedTicket := strings.TrimPrefix(ticketString, prefix)
-
-	ticketParts := strings.Split(trimmedTicket, ".")
-	if len(ticketParts) != 2 {
-		return nil, fmt.Errorf("failed to decode ticket")
-	}
-	ticketID, secretBase64 := ticketParts[0], ticketParts[1]
-
-	// ticketID must be a hexadecimal string
-	_, err := hex.DecodeString(ticketID)
-	if err != nil {
-		return nil, fmt.Errorf("server ticket failed sanity checks")
-	}
-
-	secret, err := base64.RawURLEncoding.DecodeString(secretBase64)
-	if err != nil {
-		return nil, fmt.Errorf("failed to decode initialization vector %s", err)
-	}
-	ticketData := &TicketData{
-		TicketID: ticketID,
-		Secret:   secret,
-	}
-	return ticketData, nil
-}
-
-func (ticket *TicketData) encodeTicket(prefix string) string {
-	handle := ticket.asHandle(prefix)
-	ticketString := handle + "." + base64.RawURLEncoding.EncodeToString(ticket.Secret)
-	return ticketString
-}

pkg/sessions/redis/redis_store_test.go

@@ -1,11 +1,6 @@
 package redis
 
 import (
-	"crypto/aes"
-	"crypto/cipher"
-	"crypto/rand"
-	"fmt"
-	"io"
 	"log"
 	"os"
 	"testing"
@@ -17,70 +12,12 @@ import (
 	"github.com/oauth2-proxy/oauth2-proxy/pkg/apis/options"
 	sessionsapi "github.com/oauth2-proxy/oauth2-proxy/pkg/apis/sessions"
 	"github.com/oauth2-proxy/oauth2-proxy/pkg/logger"
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/sessions/persistence"
 	"github.com/oauth2-proxy/oauth2-proxy/pkg/sessions/tests"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 )
 
-// TestLegacyV5DecodeSession tests the fallback to LegacyV5DecodeSession
-// when a V5 encoded session is in Redis
-//
-// TODO: Remove when this is deprecated (likely V7)
-func Test_legacyV5DecodeSession(t *testing.T) {
-	testCases, _, legacyCipher := sessionsapi.CreateLegacyV5TestCases(t)
-
-	for testName, tc := range testCases {
-		t.Run(testName, func(t *testing.T) {
-			g := NewWithT(t)
-
-			secret := make([]byte, aes.BlockSize)
-			_, err := io.ReadFull(rand.Reader, secret)
-			g.Expect(err).ToNot(HaveOccurred())
-			ticket := &TicketData{
-				TicketID: "",
-				Secret:   secret,
-			}
-
-			encrypted, err := legacyStoreValue(tc.Input, ticket.Secret)
-			g.Expect(err).ToNot(HaveOccurred())
-
-			ss, err := legacyV5DecodeSession(encrypted, ticket, legacyCipher)
-			if tc.Error {
-				g.Expect(err).To(HaveOccurred())
-				g.Expect(ss).To(BeNil())
-				return
-			}
-			g.Expect(err).ToNot(HaveOccurred())
-
-			// Compare sessions without *time.Time fields
-			exp := *tc.Output
-			exp.CreatedAt = nil
-			exp.ExpiresOn = nil
-			act := *ss
-			act.CreatedAt = nil
-			act.ExpiresOn = nil
-			g.Expect(exp).To(Equal(act))
-		})
-	}
-}
-
-// legacyStoreValue implements the legacy V5 Redis store AES-CFB value encryption
-//
-// TODO: Remove when this is deprecated (likely V7)
-func legacyStoreValue(value string, ticketSecret []byte) ([]byte, error) {
-	ciphertext := make([]byte, len(value))
-	block, err := aes.NewCipher(ticketSecret)
-	if err != nil {
-		return nil, fmt.Errorf("error initiating cipher block: %v", err)
-	}
-
-	// Use secret as the Initialization Vector too, because each entry has it's own key
-	stream := cipher.NewCFBEncrypter(block, ticketSecret)
-	stream.XORKeyStream(ciphertext, []byte(value))
-
-	return ciphertext, nil
-}
-
 func TestSessionStore(t *testing.T) {
 	logger.SetOutput(GinkgoWriter)
 
@@ -114,9 +51,9 @@ var _ = Describe("Redis SessionStore Tests", func() {
 
 	JustAfterEach(func() {
 		// Release any connections immediately after the test ends
-		if redisStore, ok := ss.(*SessionStore); ok {
-			if redisStore.Client != nil {
-				Expect(redisStore.Client.(closer).Close()).To(Succeed())
+		if redisManager, ok := ss.(*persistence.Manager); ok {
+			if redisManager.Store.(*SessionStore).Client != nil {
+				Expect(redisManager.Store.(*SessionStore).Client.(closer).Close()).To(Succeed())
 			}
 		}
 	})

pkg/sessions/session_store_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/oauth2-proxy/oauth2-proxy/pkg/logger"
 	"github.com/oauth2-proxy/oauth2-proxy/pkg/sessions"
 	sessionscookie "github.com/oauth2-proxy/oauth2-proxy/pkg/sessions/cookie"
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/sessions/persistence"
 	"github.com/oauth2-proxy/oauth2-proxy/pkg/sessions/redis"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -66,10 +67,11 @@ var _ = Describe("NewSessionStore", func() {
 			opts.Redis.ConnectionURL = "redis://"
 		})
 
-		It("creates a redis.SessionStore", func() {
+		It("creates a persistence.Manager that wraps a redis.SessionStore", func() {
 			ss, err := sessions.NewSessionStore(opts, cookieOpts)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(ss).To(BeAssignableToTypeOf(&redis.SessionStore{}))
+			Expect(ss).To(BeAssignableToTypeOf(&persistence.Manager{}))
+			Expect(ss.(*persistence.Manager).Store).To(BeAssignableToTypeOf(&redis.SessionStore{}))
 		})
 	})
 

pkg/sessions/tests/mock_store.go

@@ -0,0 +1,58 @@
+package tests
+
+import (
+	"context"
+	"fmt"
+	"time"
+)
+
+// entry is a MockStore cache entry with an expiration
+type entry struct {
+	data       []byte
+	expiration time.Duration
+}
+
+// MockStore is a generic in-memory implementation of persistence.Store
+// for mocking in tests
+type MockStore struct {
+	cache   map[string]entry
+	elapsed time.Duration
+}
+
+// NewMockStore creates a MockStore
+func NewMockStore() *MockStore {
+	return &MockStore{
+		cache:   map[string]entry{},
+		elapsed: 0 * time.Second,
+	}
+}
+
+// Save sets a key to the data to the memory cache
+func (s *MockStore) Save(_ context.Context, key string, value []byte, exp time.Duration) error {
+	s.cache[key] = entry{
+		data:       value,
+		expiration: exp,
+	}
+	return nil
+}
+
+// Load gets data from the memory cache via a key
+func (s *MockStore) Load(_ context.Context, key string) ([]byte, error) {
+	entry, ok := s.cache[key]
+	if !ok || entry.expiration <= s.elapsed {
+		delete(s.cache, key)
+		return nil, fmt.Errorf("key not found: %s", key)
+	}
+	return entry.data, nil
+}
+
+// Clear deletes an entry from the memory cache
+func (s *MockStore) Clear(_ context.Context, key string) error {
+	delete(s.cache, key)
+	return nil
+}
+
+// FastForward simulates the flow of time to test expirations
+func (s *MockStore) FastForward(duration time.Duration) {
+	s.elapsed += duration
+}

pkg/sessions/tests/session_store_tests.go

@@ -133,18 +133,6 @@ func RunSessionStoreTests(newSS NewSessionStoreFunc, persistentFastForward Persi
 				PersistentSessionStoreInterfaceTests(&input)
 			}
 		})
-
-		Context("with an invalid cookie secret", func() {
-			BeforeEach(func() {
-				input.cookieOpts.Secret = "invalid"
-			})
-
-			It("returns an error when initialising the session store", func() {
-				ss, err := newSS(opts, input.cookieOpts)
-				Expect(err).To(MatchError("error initialising cipher: crypto/aes: invalid key size 7"))
-				Expect(ss).To(BeNil())
-			})
-		})
 	})
 }