upgrade to latest dependencies (knative-extensions#1142)

bumping knative.dev/pkg bd99f2f...56bfe0d:
  > 56bfe0d [release-1.11] [CVE-2023-44487] Disable http2 for webhooks (# 2875)

Signed-off-by: Knative Automation <automation@knative.team>

go.mod

@@ -26,7 +26,7 @@ require (
 	k8s.io/code-generator v0.26.5
 	knative.dev/hack v0.0.0-20230712131415-ddae80293c43
 	knative.dev/networking v0.0.0-20231012062757-a5958051caf8
-	knative.dev/pkg v0.0.0-20231011193800-bd99f2f98be7
+	knative.dev/pkg v0.0.0-20231023150739-56bfe0dd9626
 )
 
 require (

go.sum

@@ -773,8 +773,8 @@ knative.dev/hack v0.0.0-20230712131415-ddae80293c43 h1:3SE06uNfSFGm/5XS+0trbyCUp
 knative.dev/hack v0.0.0-20230712131415-ddae80293c43/go.mod h1:yk2OjGDsbEnQjfxdm0/HJKS2WqTLEFg/N6nUs6Rqx3Q=
 knative.dev/networking v0.0.0-20231012062757-a5958051caf8 h1:oZMbAAXyiDZUYoQ4qEjL6uxXrL1xBVfEyQJx8sP0XEg=
 knative.dev/networking v0.0.0-20231012062757-a5958051caf8/go.mod h1:XwZwqJoLZR92N6F/sj8lHxttnry/Kiz+OgG8+uVuYn0=
-knative.dev/pkg v0.0.0-20231011193800-bd99f2f98be7 h1:y3qbfYX1SuSr/1ysXvKfpV8q/kCwWLWieCUgAhBUHmQ=
-knative.dev/pkg v0.0.0-20231011193800-bd99f2f98be7/go.mod h1:g+UCgSKQ2f15kHYu/V3CPtoKo5F1x/2Y1ot0NSK7gA0=
+knative.dev/pkg v0.0.0-20231023150739-56bfe0dd9626 h1:qFE+UDBRg6cpF5LbA0sv1XK4XZ36Z7aTRCa+HcuxnNQ=
+knative.dev/pkg v0.0.0-20231023150739-56bfe0dd9626/go.mod h1:g+UCgSKQ2f15kHYu/V3CPtoKo5F1x/2Y1ot0NSK7gA0=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=

vendor/knative.dev/pkg/webhook/webhook.go

@@ -74,6 +74,17 @@ type Options struct {
 	// ControllerOptions encapsulates options for creating a new controller,
 	// including throttling and stats behavior.
 	ControllerOptions *controller.ControllerOptions
+
+	// EnableHTTP2 enables HTTP2 for webhooks.
+	// Mitigate CVE-2023-44487 by disabling HTTP2 by default until the Go
+	// standard library and golang.org/x/net are fully fixed.
+	// Right now, it is possible for authenticated and unauthenticated users to
+	// hold open HTTP2 connections and consume huge amounts of memory.
+	// See:
+	// * https://github.com/kubernetes/kubernetes/pull/121120
+	// * https://github.com/kubernetes/kubernetes/issues/121197
+	// * https://github.com/golang/go/issues/63417#issuecomment-1758858612
+	EnableHTTP2 bool
 }
 
 // Operation is the verb being operated on
@@ -237,12 +248,19 @@ func (wh *Webhook) Run(stop <-chan struct{}) error {
 		QuietPeriod: wh.Options.GracePeriod,
 	}
 
+	// If TLSNextProto is not nil, HTTP/2 support is not enabled automatically.
+	nextProto := map[string]func(*http.Server, *tls.Conn, http.Handler){}
+	if wh.Options.EnableHTTP2 {
+		nextProto = nil
+	}
+
 	server := &http.Server{
 		ErrorLog:          log.New(&zapWrapper{logger}, "", 0),
 		Handler:           drainer,
 		Addr:              fmt.Sprint(":", wh.Options.Port),
 		TLSConfig:         wh.tlsConfig,
 		ReadHeaderTimeout: time.Minute, //https://medium.com/a-journey-with-go/go-understand-and-mitigate-slowloris-attack-711c1b1403f6
+		TLSNextProto:      nextProto,
 	}
 
 	var serve = server.ListenAndServe

vendor/modules.txt

@@ -1004,7 +1004,7 @@ knative.dev/networking/test/test_images/runtime/handlers
 knative.dev/networking/test/test_images/timeout
 knative.dev/networking/test/test_images/wsserver
 knative.dev/networking/test/types
-# knative.dev/pkg v0.0.0-20231011193800-bd99f2f98be7
+# knative.dev/pkg v0.0.0-20231023150739-56bfe0dd9626
 ## explicit; go 1.18
 knative.dev/pkg/apis
 knative.dev/pkg/apis/duck