callback_handler.go: simplify stored ID token claims

Fosite is gonna set these fields for us.

Signed-off-by: Ryan Richard <richardry@vmware.com>

internal/oidc/auth/auth_handler_test.go

@@ -125,7 +125,7 @@ func TestAuthorizationEndpoint(t *testing.T) {
 	oauthStore := oidc.NullStorage{}
 	hmacSecret := []byte("some secret - must have at least 32 bytes")
 	require.GreaterOrEqual(t, len(hmacSecret), 32, "fosite requires that hmac secrets have at least 32 bytes")
-	oauthHelper := oidc.FositeOauth2Helper(oauthStore, hmacSecret)
+	oauthHelper := oidc.FositeOauth2Helper(oauthStore, downstreamIssuer, hmacSecret)
 
 	happyCSRF := "test-csrf"
 	happyPKCE := "test-pkce"

internal/oidc/callback/callback_handler.go

@@ -36,13 +36,9 @@ const (
 	// downstreamGroupsClaim is what we will use to encode the groups in the downstream OIDC ID token
 	// information.
 	downstreamGroupsClaim = "groups"
-
-	// The lifetime of an issued downstream ID token.
-	downstreamIDTokenLifetime = time.Minute * 5
 )
 
 func NewHandler(
-	downstreamIssuer string,
 	idpListGetter oidc.IDPListGetter,
 	oauthHelper fosite.OAuth2Provider,
 	stateDecoder, cookieDecoder oidc.Decoder,
@@ -97,13 +93,7 @@ func NewHandler(
 			return err
 		}
 
-		openIDSession := makeDownstreamSession(
-			downstreamIssuer,
-			downstreamAuthParams.Get("client_id"),
-			downstreamAuthParams.Get("nonce"),
-			username,
-			groups,
-		)
+		openIDSession := makeDownstreamSession(username, groups)
 		authorizeResponder, err := oauthHelper.NewAuthorizeResponse(r.Context(), authorizeRequester, openIDSession)
 		if err != nil {
 			plog.WarningErr("error while generating and saving authcode", err, "upstreamName", upstreamIDPConfig.GetName())
@@ -297,16 +287,11 @@ func getGroupsFromUpstreamIDToken(
 	return groups, nil
 }
 
-func makeDownstreamSession(issuer, clientID, nonce, username string, groups []string) *openid.DefaultSession {
-	now := time.Now()
+func makeDownstreamSession(username string, groups []string) *openid.DefaultSession {
+	now := time.Now().UTC()
 	openIDSession := &openid.DefaultSession{
 		Claims: &jwt.IDTokenClaims{
-			Issuer:      issuer,
 			Subject:     username,
-			Audience:    []string{clientID},
-			Nonce:       nonce,
-			ExpiresAt:   now.Add(downstreamIDTokenLifetime),
-			IssuedAt:    now,
 			RequestedAt: now,
 			AuthTime:    now,
 		},

internal/oidc/callback/callback_handler_test.go

@@ -430,10 +430,10 @@ func TestCallbackEndpoint(t *testing.T) {
 			}
 			hmacSecret := []byte("some secret - must have at least 32 bytes")
 			require.GreaterOrEqual(t, len(hmacSecret), 32, "fosite requires that hmac secrets have at least 32 bytes")
-			oauthHelper := oidc.FositeOauth2Helper(oauthStore, hmacSecret)
+			oauthHelper := oidc.FositeOauth2Helper(oauthStore, downstreamIssuer, hmacSecret)
 
 			idpListGetter := oidctestutil.NewIDPListGetter(&test.idp)
-			subject := NewHandler(downstreamIssuer, idpListGetter, oauthHelper, happyStateCodec, happyCookieCodec)
+			subject := NewHandler(idpListGetter, oauthHelper, happyStateCodec, happyCookieCodec)
 			req := httptest.NewRequest(test.method, test.path, nil)
 			if test.csrfCookie != "" {
 				req.Header.Set("Cookie", test.csrfCookie)
@@ -480,7 +480,6 @@ func TestCallbackEndpoint(t *testing.T) {
 					test.wantDownstreamIDTokenSubject,
 					test.wantDownstreamIDTokenGroups,
 					test.wantDownstreamRequestedScopes,
-					test.wantDownstreamNonce,
 				)
 
 				validatePKCEStorage(
@@ -688,7 +687,6 @@ func validateAuthcodeStorage(
 	wantDownstreamIDTokenSubject string,
 	wantDownstreamIDTokenGroups []string,
 	wantDownstreamRequestedScopes []string,
-	wantDownstreamNonce string,
 ) (*fosite.Request, *openid.DefaultSession) {
 	t.Helper()
 
@@ -740,14 +738,22 @@ func validateAuthcodeStorage(
 		require.NotContains(t, actualClaims.Extra, "groups")
 	}
 
-	// Check the rest of the downstream ID token's claims.
-	require.Equal(t, downstreamIssuer, actualClaims.Issuer)
-	require.Equal(t, []string{downstreamClientID}, actualClaims.Audience)
-	require.Equal(t, wantDownstreamNonce, actualClaims.Nonce)
-	testutil.RequireTimeInDelta(t, time.Now().Add(time.Minute*5), actualClaims.ExpiresAt, timeComparisonFudgeFactor)
-	testutil.RequireTimeInDelta(t, time.Now(), actualClaims.IssuedAt, timeComparisonFudgeFactor)
-	testutil.RequireTimeInDelta(t, time.Now(), actualClaims.RequestedAt, timeComparisonFudgeFactor)
-	testutil.RequireTimeInDelta(t, time.Now(), actualClaims.AuthTime, timeComparisonFudgeFactor)
+	// Check the rest of the downstream ID token's claims. Fosite wants us to set these (in UTC time).
+	testutil.RequireTimeInDelta(t, time.Now().UTC(), actualClaims.RequestedAt, timeComparisonFudgeFactor)
+	testutil.RequireTimeInDelta(t, time.Now().UTC(), actualClaims.AuthTime, timeComparisonFudgeFactor)
+	requestedAtZone, _ := actualClaims.RequestedAt.Zone()
+	require.Equal(t, "UTC", requestedAtZone)
+	authTimeZone, _ := actualClaims.AuthTime.Zone()
+	require.Equal(t, "UTC", authTimeZone)
+
+	// Fosite will set these fields for us in the token endpoint based on the store session
+	// information. Therefore, we assert that they are empty because we want the library to do the
+	// lifting for us.
+	require.Empty(t, actualClaims.Issuer)
+	require.Nil(t, actualClaims.Audience)
+	require.Empty(t, actualClaims.Nonce)
+	require.Zero(t, actualClaims.ExpiresAt)
+	require.Zero(t, actualClaims.IssuedAt)
 
 	// These are not needed yet.
 	require.Empty(t, actualClaims.JTI)

internal/oidc/oidc.go

@@ -85,9 +85,10 @@ func PinnipedCLIOIDCClient() *fosite.DefaultOpenIDConnectClient {
 	}
 }
 
-func FositeOauth2Helper(oauthStore interface{}, hmacSecretOfLengthAtLeast32 []byte) fosite.OAuth2Provider {
+func FositeOauth2Helper(oauthStore interface{}, issuer string, hmacSecretOfLengthAtLeast32 []byte) fosite.OAuth2Provider {
 	oauthConfig := &compose.Config{
 		EnforcePKCEForPublicClients: true,
+		IDTokenIssuer:               issuer,
 	}
 
 	return compose.Compose(

internal/oidc/provider/manager/manager.go

@@ -71,7 +71,7 @@ func (m *Manager) SetProviders(oidcProviders ...*provider.OIDCProvider) {
 
 		// Use NullStorage for the authorize endpoint because we do not actually want to store anything until
 		// the upstream callback endpoint is called later.
-		oauthHelper := oidc.FositeOauth2Helper(oidc.NullStorage{}, []byte("some secret - must have at least 32 bytes")) // TODO replace this secret
+		oauthHelper := oidc.FositeOauth2Helper(oidc.NullStorage{}, incomingProvider.Issuer(), []byte("some secret - must have at least 32 bytes")) // TODO replace this secret
 
 		// TODO use different codecs for the state and the cookie, because:
 		//  1. we would like to state to have an embedded expiration date while the cookie does not need that
@@ -86,7 +86,7 @@ func (m *Manager) SetProviders(oidcProviders ...*provider.OIDCProvider) {
 		m.providerHandlers[authURL] = auth.NewHandler(incomingProvider.Issuer(), m.idpListGetter, oauthHelper, csrftoken.Generate, pkce.Generate, nonce.Generate, encoder, encoder)
 
 		callbackURL := strings.ToLower(incomingProvider.IssuerHost()) + "/" + incomingProvider.IssuerPath() + oidc.CallbackEndpointPath
-		m.providerHandlers[callbackURL] = callback.NewHandler(incomingProvider.Issuer(), m.idpListGetter, oauthHelper, encoder, encoder)
+		m.providerHandlers[callbackURL] = callback.NewHandler(m.idpListGetter, oauthHelper, encoder, encoder)
 
 		plog.Debug("oidc provider manager added or updated issuer", "issuer", incomingProvider.Issuer())
 	}