Decouple TokenToSession from OIDC & add a generic VerifyFunc

oauthproxy.go

@@ -269,14 +269,18 @@ func buildSessionChain(opts *options.Options, sessionStore sessionsapi.SessionSt
 		sessionLoaders := []middlewareapi.TokenToSessionLoader{}
 		if opts.GetOIDCVerifier() != nil {
 			sessionLoaders = append(sessionLoaders, middlewareapi.TokenToSessionLoader{
-				Verifier:       opts.GetOIDCVerifier(),
+				Verifier: func(ctx context.Context, token string) (interface{}, error) {
-				TokenToSession: opts.GetProvider().CreateSessionFromBearer,
+					return opts.GetOIDCVerifier().Verify(ctx, token)
+				},
+				TokenToSession: opts.GetProvider().CreateSessionFromToken,
 			})
 		}
 
 		for _, verifier := range opts.GetJWTBearerVerifiers() {
 			sessionLoaders = append(sessionLoaders, middlewareapi.TokenToSessionLoader{
-				Verifier: verifier,
+				Verifier: func(ctx context.Context, token string) (interface{}, error) {
+					return verifier.Verify(ctx, token)
+				},
 			})
 		}
 

pkg/apis/middleware/session.go

@@ -3,22 +3,24 @@ package middleware
 import (
 	"context"
 
-	"github.com/coreos/go-oidc"
 	sessionsapi "github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 )
 
 // TokenToSessionFunc takes a rawIDToken and an idToken and converts it into a
 // SessionState.
-type TokenToSessionFunc func(ctx context.Context, rawIDToken string, idToken *oidc.IDToken) (*sessionsapi.SessionState, error)
+type TokenToSessionFunc func(ctx context.Context, token string, verify VerifyFunc) (*sessionsapi.SessionState, error)
+
+// VerifyFunc takes a raw bearer token and verifies it
+type VerifyFunc func(ctx context.Context, token string) (interface{}, error)
 
 // TokenToSessionLoader pairs a token verifier with the correct converter function
 // to convert the ID Token to a SessionState.
 type TokenToSessionLoader struct {
-	// Verfier is used to verify that the ID Token was signed by the claimed issuer
+	// Verifier is used to verify that the ID Token was signed by the claimed issuer
 	// and that the token has not been tampered with.
-	Verifier *oidc.IDTokenVerifier
+	Verifier VerifyFunc
 
-	// TokenToSession converts a rawIDToken and an idToken to a SessionState.
+	// TokenToSession converts a raw bearer token to a SessionState.
 	// (Optional) If not set a default basic implementation is used.
 	TokenToSession TokenToSessionFunc
 }

pkg/middleware/jwt_session.go

@@ -13,14 +13,14 @@ import (
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/logger"
 )
 
-const jwtRegexFormat = `^eyJ[a-zA-Z0-9_-]*\.eyJ[a-zA-Z0-9_-]*\.[a-zA-Z0-9_-]+$`
+const jwtRegexFormat = `^ey[IJ][a-zA-Z0-9_-]*\.ey[IJ][a-zA-Z0-9_-]*\.[a-zA-Z0-9_-]+$`
 
 func NewJwtSessionLoader(sessionLoaders []middlewareapi.TokenToSessionLoader) alice.Constructor {
 	for i, loader := range sessionLoaders {
 		if loader.TokenToSession == nil {
 			sessionLoaders[i] = middlewareapi.TokenToSessionLoader{
 				Verifier:       loader.Verifier,
-				TokenToSession: createSessionStateFromBearerToken,
+				TokenToSession: createSessionFromToken,
 			}
 		}
 	}
@@ -75,24 +75,24 @@ func (j *jwtSessionLoader) getJwtSession(req *http.Request) (*sessionsapi.Sessio
 		return nil, nil
 	}
 
-	rawBearerToken, err := j.findBearerTokenFromHeader(auth)
+	token, err := j.findTokenFromHeader(auth)
 	if err != nil {
 		return nil, err
 	}
 
 	for _, loader := range j.sessionLoaders {
-		bearerToken, err := loader.Verifier.Verify(req.Context(), rawBearerToken)
+		session, err := loader.TokenToSession(req.Context(), token, loader.Verifier)
 		if err == nil {
-			// The token was verified, convert it to a session
+			return session, nil
-			return loader.TokenToSession(req.Context(), rawBearerToken, bearerToken)
 		}
 	}
 
+	// TODO (@NickMeves) Aggregate error logs in the chain
 	return nil, fmt.Errorf("unable to verify jwt token: %q", req.Header.Get("Authorization"))
 }
 
-// findBearerTokenFromHeader finds a valid JWT token from the Authorization header of a given request.
+// findTokenFromHeader finds a valid JWT token from the Authorization header of a given request.
-func (j *jwtSessionLoader) findBearerTokenFromHeader(header string) (string, error) {
+func (j *jwtSessionLoader) findTokenFromHeader(header string) (string, error) {
 	tokenType, token, err := splitAuthHeader(header)
 	if err != nil {
 		return "", err
@@ -133,9 +133,9 @@ func (j *jwtSessionLoader) getBasicToken(token string) (string, error) {
 	return "", fmt.Errorf("invalid basic auth token found in authorization header")
 }
 
-// createSessionStateFromBearerToken is a default implementation for converting
+// createSessionFromToken is a default implementation for converting
 // a JWT into a session state.
-func createSessionStateFromBearerToken(ctx context.Context, rawIDToken string, idToken *oidc.IDToken) (*sessionsapi.SessionState, error) {
+func createSessionFromToken(ctx context.Context, token string, verify middlewareapi.VerifyFunc) (*sessionsapi.SessionState, error) {
 	var claims struct {
 		Subject           string `json:"sub"`
 		Email             string `json:"email"`
@@ -143,6 +143,16 @@ func createSessionStateFromBearerToken(ctx context.Context, rawIDToken string, i
 		PreferredUsername string `json:"preferred_username"`
 	}
 
+	verifiedToken, err := verify(ctx, token)
+	if err != nil {
+		return nil, err
+	}
+
+	idToken, ok := verifiedToken.(*oidc.IDToken)
+	if !ok {
+		return nil, fmt.Errorf("failed to create IDToken from bearer token: %s", token)
+	}
+
 	if err := idToken.Claims(&claims); err != nil {
 		return nil, fmt.Errorf("failed to parse bearer token claims: %v", err)
 	}
@@ -159,8 +169,8 @@ func createSessionStateFromBearerToken(ctx context.Context, rawIDToken string, i
 		Email:             claims.Email,
 		User:              claims.Subject,
 		PreferredUsername: claims.PreferredUsername,
-		AccessToken:       rawIDToken,
+		AccessToken:       token,
-		IDToken:           rawIDToken,
+		IDToken:           token,
 		RefreshToken:      "",
 		ExpiresOn:         &idToken.Expiry,
 	}

pkg/middleware/jwt_session_test.go

@@ -73,13 +73,20 @@ Nnc3a3lGVWFCNUMxQnNJcnJMTWxka1dFaHluYmI4Ongtb2F1dGgtYmFzaWM=`
 	const validToken = "eyJfoobar.eyJfoobar.12345asdf"
 
 	Context("JwtSessionLoader", func() {
-		var verifier *oidc.IDTokenVerifier
+		var verifier middlewareapi.VerifyFunc
 		const nonVerifiedToken = validToken
 
 		BeforeEach(func() {
-			keyset := noOpKeySet{}
+			verifier = func(ctx context.Context, token string) (interface{}, error) {
-			verifier = oidc.NewVerifier("https://issuer.example.com", keyset,
+				return oidc.NewVerifier(
-				&oidc.Config{ClientID: "https://test.myapp.com", SkipExpiryCheck: true})
+					"https://issuer.example.com",
+					noOpKeySet{},
+					&oidc.Config{
+						ClientID:        "https://test.myapp.com",
+						SkipExpiryCheck: true,
+					},
+				).Verify(ctx, token)
+			}
 		})
 
 		type jwtSessionLoaderTableInput struct {
@@ -167,16 +174,23 @@ Nnc3a3lGVWFCNUMxQnNJcnJMTWxka1dFaHluYmI4Ongtb2F1dGgtYmFzaWM=`
 		const nonVerifiedToken = validToken
 
 		BeforeEach(func() {
-			keyset := noOpKeySet{}
+			verifier := func(ctx context.Context, token string) (interface{}, error) {
-			verifier := oidc.NewVerifier("https://issuer.example.com", keyset,
+				return oidc.NewVerifier(
-				&oidc.Config{ClientID: "https://test.myapp.com", SkipExpiryCheck: true})
+					"https://issuer.example.com",
+					noOpKeySet{},
+					&oidc.Config{
+						ClientID:        "https://test.myapp.com",
+						SkipExpiryCheck: true,
+					},
+				).Verify(ctx, token)
+			}
 
 			j = &jwtSessionLoader{
 				jwtRegex: regexp.MustCompile(jwtRegexFormat),
 				sessionLoaders: []middlewareapi.TokenToSessionLoader{
 					{
 						Verifier:       verifier,
-						TokenToSession: createSessionStateFromBearerToken,
+						TokenToSession: createSessionFromToken,
 					},
 				},
 			}
@@ -239,7 +253,7 @@ Nnc3a3lGVWFCNUMxQnNJcnJMTWxka1dFaHluYmI4Ongtb2F1dGgtYmFzaWM=`
 		)
 	})
 
-	Context("findBearerTokenFromHeader", func() {
+	Context("findTokenFromHeader", func() {
 		var j *jwtSessionLoader
 
 		BeforeEach(func() {
@@ -256,7 +270,7 @@ Nnc3a3lGVWFCNUMxQnNJcnJMTWxka1dFaHluYmI4Ongtb2F1dGgtYmFzaWM=`
 
 		DescribeTable("with a header",
 			func(in findBearerTokenFromHeaderTableInput) {
-				token, err := j.findBearerTokenFromHeader(in.header)
+				token, err := j.findTokenFromHeader(in.header)
 				if in.expectedErr != nil {
 					Expect(err).To(MatchError(in.expectedErr))
 				} else {
@@ -381,7 +395,7 @@ Nnc3a3lGVWFCNUMxQnNJcnJMTWxka1dFaHluYmI4Ongtb2F1dGgtYmFzaWM=`
 		)
 	})
 
-	Context("createSessionStateFromBearerToken", func() {
+	Context("createSessionFromToken", func() {
 		ctx := context.Background()
 		expiresFuture := time.Now().Add(time.Duration(5) * time.Minute)
 		verified := true
@@ -403,23 +417,26 @@ Nnc3a3lGVWFCNUMxQnNJcnJMTWxka1dFaHluYmI4Ongtb2F1dGgtYmFzaWM=`
 
 		DescribeTable("when creating a session from an IDToken",
 			func(in createSessionStateTableInput) {
-				verifier := oidc.NewVerifier(
+				verifier := func(ctx context.Context, token string) (interface{}, error) {
+					oidcVerifier := oidc.NewVerifier(
 						"https://issuer.example.com",
 						noOpKeySet{},
 						&oidc.Config{ClientID: "asdf1234"},
 					)
 
+					idToken, err := oidcVerifier.Verify(ctx, token)
+					Expect(err).ToNot(HaveOccurred())
+
+					return idToken, nil
+				}
+
 				key, err := rsa.GenerateKey(rand.Reader, 2048)
 				Expect(err).ToNot(HaveOccurred())
 
 				rawIDToken, err := jwt.NewWithClaims(jwt.SigningMethodRS256, in.idToken).SignedString(key)
 				Expect(err).ToNot(HaveOccurred())
 
-				// Pass to a dummy Verifier to get an oidc.IDToken from the rawIDToken for our actual test below
+				session, err := createSessionFromToken(ctx, rawIDToken, verifier)
-				idToken, err := verifier.Verify(context.Background(), rawIDToken)
-				Expect(err).ToNot(HaveOccurred())
-
-				session, err := createSessionStateFromBearerToken(ctx, rawIDToken, idToken)
 				if in.expectedErr != nil {
 					Expect(err).To(MatchError(in.expectedErr))
 					Expect(session).To(BeNil())

providers/oidc.go

@@ -11,6 +11,7 @@ import (
 	oidc "github.com/coreos/go-oidc"
 	"golang.org/x/oauth2"
 
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/middleware"
 	"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/pkg/requests"
@@ -175,14 +176,24 @@ func (p *OIDCProvider) createSessionState(ctx context.Context, token *oauth2.Tok
 	return newSession, nil
 }
 
-func (p *OIDCProvider) CreateSessionFromBearer(ctx context.Context, rawIDToken string, idToken *oidc.IDToken) (*sessions.SessionState, error) {
+func (p *OIDCProvider) CreateSessionFromToken(ctx context.Context, token string, verify middleware.VerifyFunc) (*sessions.SessionState, error) {
+	verifiedToken, err := verify(ctx, token)
+	if err != nil {
+		return nil, err
+	}
+
+	idToken, ok := verifiedToken.(*oidc.IDToken)
+	if !ok {
+		return nil, fmt.Errorf("failed to create IDToken from bearer token: %s", token)
+	}
+
 	newSession, err := p.createSessionStateInternal(ctx, idToken, nil)
 	if err != nil {
 		return nil, err
 	}
 
-	newSession.AccessToken = rawIDToken
+	newSession.AccessToken = token
-	newSession.IDToken = rawIDToken
+	newSession.IDToken = token
 	newSession.RefreshToken = ""
 	newSession.ExpiresOn = &idToken.Expiry
 

providers/oidc_test.go

@@ -347,14 +347,18 @@ func TestCreateSessionStateFromBearerToken(t *testing.T) {
 			rawIDToken, err := newSignedTestIDToken(tc.IDToken)
 			assert.NoError(t, err)
 
+			verifyFunc := func(ctx context.Context, token string) (interface{}, error) {
 				keyset := fakeKeySetStub{}
 				verifier := oidc.NewVerifier("https://issuer.example.com", keyset,
 					&oidc.Config{ClientID: "https://test.myapp.com", SkipExpiryCheck: true})
 
-			idToken, err := verifier.Verify(context.Background(), rawIDToken)
+				idToken, err := verifier.Verify(ctx, token)
 				assert.NoError(t, err)
 
-			ss, err := provider.CreateSessionFromBearer(context.Background(), rawIDToken, idToken)
+				return idToken, nil
+			}
+
+			ss, err := provider.CreateSessionFromToken(context.Background(), rawIDToken, verifyFunc)
 			assert.NoError(t, err)
 
 			assert.Equal(t, tc.ExpectedUser, ss.User)

providers/provider_default.go

@@ -8,8 +8,7 @@ import (
 	"net/url"
 	"time"
 
-	"github.com/coreos/go-oidc"
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/middleware"
-
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/requests"
 )
@@ -127,6 +126,6 @@ func (p *ProviderData) RefreshSessionIfNeeded(_ context.Context, _ *sessions.Ses
 
 // CreateSessionStateFromBearerToken should be implemented to allow providers
 // to convert ID tokens into sessions
-func (p *ProviderData) CreateSessionFromBearer(_ context.Context, _ string, _ *oidc.IDToken) (*sessions.SessionState, error) {
+func (p *ProviderData) CreateSessionFromToken(_ context.Context, _ string, _ middleware.VerifyFunc) (*sessions.SessionState, error) {
 	return nil, ErrNotImplemented
 }

providers/providers.go

@@ -3,7 +3,7 @@ package providers
 import (
 	"context"
 
-	"github.com/coreos/go-oidc"
+	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/middleware"
 	"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/sessions"
 )
 
@@ -18,7 +18,7 @@ type Provider interface {
 	ValidateSession(ctx context.Context, s *sessions.SessionState) bool
 	GetLoginURL(redirectURI, finalRedirect string) string
 	RefreshSessionIfNeeded(ctx context.Context, s *sessions.SessionState) (bool, error)
-	CreateSessionFromBearer(ctx context.Context, rawIDToken string, idToken *oidc.IDToken) (*sessions.SessionState, error)
+	CreateSessionFromToken(ctx context.Context, token string, verify middleware.VerifyFunc) (*sessions.SessionState, error)
 }
 
 // New provides a new Provider based on the configured provider string