add a catch-all route if needed

internal/gatewayapi/testdata/securitypolicy-with-basic-auth.out.yaml

@@ -155,3 +155,14 @@ xdsIR:
           distinct: false
           name: ""
           prefix: /foo
+      - backendWeights:
+          invalid: 0
+          valid: 0
+        directResponse:
+          statusCode: 404
+        hostname: gateway.envoyproxy.io
+        name: catch-all
+        pathMatch:
+          distinct: false
+          name: ""
+          prefix: /

internal/gatewayapi/testdata/securitypolicy-with-extauth.out.yaml

@@ -272,3 +272,25 @@ xdsIR:
           distinct: false
           name: ""
           prefix: /bar
+      - backendWeights:
+          invalid: 0
+          valid: 0
+        directResponse:
+          statusCode: 404
+        hostname: www.foo.com
+        name: catch-all
+        pathMatch:
+          distinct: false
+          name: ""
+          prefix: /
+      - backendWeights:
+          invalid: 0
+          valid: 0
+        directResponse:
+          statusCode: 404
+        hostname: www.bar.com
+        name: catch-all
+        pathMatch:
+          distinct: false
+          name: ""
+          prefix: /

internal/gatewayapi/testdata/securitypolicy-with-oidc.out.yaml

@@ -193,9 +193,10 @@ securityPolicies:
   status:
     conditions:
     - lastTransitionTime: null
-      message: SecurityPolicy has been accepted.
-      reason: Accepted
-      status: "True"
+      message: 'Error fetching endpoints from issuer: Get "https://accounts.google.com/.well-known/openid-configuration":
+        net/http: TLS handshake timeout'
+      reason: Invalid
+      status: "False"
       type: Accepted
 xdsIR:
   envoy-gateway/gateway-1:
@@ -258,18 +259,18 @@ xdsIR:
             weight: 1
         hostname: www.example.com
         name: httproute/default/httproute-2/rule/0/match/0/www_example_com
-        oidc:
-          clientID: client1.apps.googleusercontent.com
-          clientSecret: Y2xpZW50MTpzZWNyZXQK
-          logoutPath: /bar/logout
-          provider:
-            authorizationEndpoint: https://accounts.google.com/o/oauth2/v2/auth
-            tokenEndpoint: https://oauth2.googleapis.com/token
-          redirectPath: /bar/oauth2/callback
-          redirectURL: https://www.example.com/bar/oauth2/callback
-          scopes:
-          - openid
         pathMatch:
           distinct: false
           name: ""
           prefix: /bar
+      - backendWeights:
+          invalid: 0
+          valid: 0
+        directResponse:
+          statusCode: 404
+        hostname: www.example.com
+        name: catch-all
+        pathMatch:
+          distinct: false
+          name: ""
+          prefix: /

internal/gatewayapi/translator.go

@@ -8,6 +8,7 @@
 import (
 	"golang.org/x/exp/maps"
 	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/utils/ptr"
 	gwapiv1 "sigs.k8s.io/gateway-api/apis/v1"
 
 	egv1a1 "github.com/envoyproxy/gateway/api/v1alpha1"
@@ -201,12 +202,60 @@
 	// Sort xdsIR based on the Gateway API spec
 	sortXdsIRMap(xdsIR)
 
+	// Add a catch-all route for each HTTP listener if needed
+	addCatchAllRoute(xdsIR)
+
 	return newTranslateResult(gateways, httpRoutes, grpcRoutes, tlsRoutes,
 		tcpRoutes, udpRoutes, clientTrafficPolicies, backendTrafficPolicies,
 		securityPolicies, xdsIR, infraIR)
 
 }
 
+// For filters without native per-route support, we need to add a catch-all route
+// to ensure that these filters are disabled for non-matching requests.
+// https://github.com/envoyproxy/gateway/issues/2507
+func addCatchAllRoute(xdsIR map[string]*ir.Xds) {
+	for _, i := range xdsIR {
+		for _, http := range i.HTTP {
+			var needCatchAllRoutePerHost = make(map[string]bool)
+			for _, r := range http.Routes {
+				if r.ExtAuth != nil || r.BasicAuth != nil || r.OIDC != nil {
+					needCatchAllRoutePerHost[r.Hostname] = true
+				}
+			}
+
+			// skip if there is already a catch-all route
+			for host, _ := range needCatchAllRoutePerHost {
+				for _, r := range http.Routes {
+					if (r.Hostname == host &&
+						r.PathMatch != nil &&
+						r.PathMatch.Prefix != nil &&
+						*r.PathMatch.Prefix == "/") &&
+						len(r.HeaderMatches) == 0 &&
+						len(r.QueryParamMatches) == 0 {
+						needCatchAllRoutePerHost[host] = false
+					}
+				}
+			}
+
+			for host, needCatchAllRoute := range needCatchAllRoutePerHost {
+				if needCatchAllRoute {
+					http.Routes = append(http.Routes, &ir.HTTPRoute{
+						Name: "catch-all",
+						PathMatch: &ir.StringMatch{
+							Prefix: ptr.To("/"),
+						},
+						DirectResponse: &ir.DirectResponse{
+							StatusCode: 404,
+						},
+						Hostname: host,
+					})
+				}
+			}
+		}
+	}
+}
+
 // GetRelevantGateways returns GatewayContexts, containing a copy of the original
 // Gateway with the Listener statuses reset.
 func (t *Translator) GetRelevantGateways(gateways []*gwapiv1.Gateway) []*GatewayContext {

site/content/en/latest/user/oidc.md

@@ -34,7 +34,11 @@ providers, including Auth0, Azure AD, Keycloak, Okta, OneLogin, Salesforce, UAA,
 
 Follow the steps in the [Google OIDC documentation][google-oidc] to register an OIDC application. Please make sure the
 redirect URL is set to the one you configured in the SecurityPolicy that you will create in the step below. If you don't
-specify a redirect URL in the SecurityPolicy, the default redirect URL is `https://<gateway-hostname>/oauth2/callback`.
+specify a redirect URL in the SecurityPolicy, the default redirect URL is `https://${GATEWAY_HOST}/oauth2/callback`.
+Please notice that the `redirectURL` and `logoutPath` must be caught by the target HTTPRoute. For example, if the 
+HTTPRoute is configured to match the host `www.example.com` and the path `/foo`, the `redirectURL` must
+be prefixed with `https://www.example.com/foo`, and `logoutPath` must be prefixed with`/foo`, for example,
+`https://www.example.com/foo/oauth2/callback` and `/foo/logout`, otherwise the OIDC authentication will fail.
 
 After registering the application, you should have the following information:
 * Client ID: The client ID of the OIDC application.
@@ -73,6 +77,8 @@ spec:
     clientID: "${CLIENT_ID}.apps.googleusercontent.com"
     clientSecret:
       name: "my-app-client-secret"
+    redirectURI: "https://www.example.com/oauth2/callback"
+    logoutPath: "/logout"
 EOF
 ```
 

test/e2e/tests/basic-auth.go

@@ -156,6 +156,35 @@ var BasicAuthTest = suite.ConformanceTest{
 				t.Errorf("failed to compare request and response: %v", err)
 			}
 		})
+
+		// https://github.com/envoyproxy/gateway/issues/2507
+		t.Run("request without matching routes ", func(t *testing.T) {
+			ns := "gateway-conformance-infra"
+			routeNN := types.NamespacedName{Name: "http-with-basic-auth-1", Namespace: ns}
+			gwNN := types.NamespacedName{Name: "same-namespace", Namespace: ns}
+			gwAddr := kubernetes.GatewayAndHTTPRoutesMustBeAccepted(t, suite.Client, suite.TimeoutConfig, suite.ControllerName, kubernetes.NewGatewayRef(gwNN), routeNN)
+			SecurityPolicyMustBeAccepted(t, suite.Client, types.NamespacedName{Name: "basic-auth-1", Namespace: ns})
+			// TODO: We should wait for the `programmed` condition to be true before sending traffic.
+			expectedResponse := http.ExpectedResponse{
+				Request: http.Request{
+					Path: "/not-matching-route",
+				},
+				Response: http.Response{
+					StatusCode: 404,
+				},
+				Namespace: ns,
+			}
+
+			req := http.MakeRequest(t, &expectedResponse, gwAddr, "HTTP", "http")
+			cReq, cResp, err := suite.RoundTripper.CaptureRoundTrip(req)
+			if err != nil {
+				t.Errorf("failed to get expected response: %v", err)
+			}
+
+			if err := http.CompareRequest(t, &req, cReq, cResp, expectedResponse); err != nil {
+				t.Errorf("failed to compare request and response: %v", err)
+			}
+		})
 	},
 }