OCPBUGS-22350: address CVE-2023-44487

- bump controller-runtime v0.15.3
- bump operand image 0e095a3
- disable HTTP2 for kube-rbac-proxy container
- disable HTTP2 for webhook server

bundle/manifests/external-dns-operator.clusterserviceversion.yaml

@@ -436,13 +436,14 @@ spec:
                 - --externaldns-image=$(RELATED_IMAGE_EXTERNAL_DNS)
                 - --trusted-ca-configmap=$(TRUSTED_CA_CONFIGMAP_NAME)
                 - --leader-elect
+                - --webhook-disable-http2
                 env:
                 - name: OPERATOR_NAMESPACE
                   valueFrom:
                     fieldRef:
                       fieldPath: metadata.namespace
                 - name: RELATED_IMAGE_EXTERNAL_DNS
-                  value: quay.io/external-dns-operator/external-dns@sha256:a742a727d3a18ffb78c7d0a24fd2c5eebed01479163959169203427514d7aa89
+                  value: quay.io/external-dns-operator/external-dns@sha256:6fa3afebbc99926163d4c827a638473e106e6589e9f3d3d3accd3e426693f04f
                 - name: TRUSTED_CA_CONFIGMAP_NAME
                 image: quay.io/openshift/origin-external-dns-operator:latest
                 name: external-dns-operator
@@ -479,6 +480,7 @@ spec:
                 - --v=10
                 - --tls-cert-file=/var/run/secrets/serving-cert/tls.crt
                 - --tls-private-key-file=/var/run/secrets/serving-cert/tls.key
+                - --http2-disable
                 image: quay.io/openshift/origin-kube-rbac-proxy:latest
                 name: kube-rbac-proxy
                 ports:

config/default/manager_auth_proxy_patch.yaml

@@ -16,6 +16,7 @@ spec:
         - "--v=10"
         - "--tls-cert-file=/var/run/secrets/serving-cert/tls.crt"
         - "--tls-private-key-file=/var/run/secrets/serving-cert/tls.key"
+        - "--http2-disable"
         ports:
         - containerPort: 8443
           name: https

config/manager/manager.yaml

@@ -38,14 +38,15 @@ spec:
         - --externaldns-image=$(RELATED_IMAGE_EXTERNAL_DNS)
         - --trusted-ca-configmap=$(TRUSTED_CA_CONFIGMAP_NAME)
         - --leader-elect
+        - --webhook-disable-http2
         env:
         - name: OPERATOR_NAMESPACE
           valueFrom:
             fieldRef:
               fieldPath: metadata.namespace
         - name: RELATED_IMAGE_EXTERNAL_DNS
-          # openshift/external-dns commit: fe00b4b83c2263282a9068655e8e3fbbc167b653
-          value: quay.io/external-dns-operator/external-dns@sha256:a742a727d3a18ffb78c7d0a24fd2c5eebed01479163959169203427514d7aa89
+          # openshift/external-dns commit: 0e095a3db5ae9518a1744dd85d3f7ed2e359768d
+          value: quay.io/external-dns-operator/external-dns@sha256:6fa3afebbc99926163d4c827a638473e106e6589e9f3d3d3accd3e426693f04f
         - name: TRUSTED_CA_CONFIGMAP_NAME
         securityContext:
           capabilities:

go.mod

@@ -17,12 +17,12 @@ require (
 	github.com/openshift/cloud-credential-operator v0.0.0-20211118210017-9066dcc747fa
 	github.com/operator-framework/api v0.11.0
 	google.golang.org/api v0.58.0
-	k8s.io/api v0.27.4
-	k8s.io/apimachinery v0.27.4
-	k8s.io/apiserver v0.27.2
-	k8s.io/client-go v0.27.4
+	k8s.io/api v0.27.7
+	k8s.io/apimachinery v0.27.7
+	k8s.io/apiserver v0.27.7
+	k8s.io/client-go v0.27.7
 	k8s.io/utils v0.0.0-20230209194617-a36077c30491
-	sigs.k8s.io/controller-runtime v0.15.1
+	sigs.k8s.io/controller-runtime v0.15.3
 	sigs.k8s.io/controller-runtime/tools/setup-envtest v0.0.0-20220602164547-f46919744bee
 	sigs.k8s.io/controller-tools v0.6.2
 	sigs.k8s.io/kustomize/kustomize/v4 v4.5.7
@@ -92,13 +92,13 @@ require (
 	go.uber.org/atomic v1.7.0 // indirect
 	go.uber.org/multierr v1.6.0 // indirect
 	go.uber.org/zap v1.24.0 // indirect
-	golang.org/x/crypto v0.1.0 // indirect
+	golang.org/x/crypto v0.14.0 // indirect
 	golang.org/x/mod v0.10.0 // indirect
-	golang.org/x/net v0.10.0 // indirect
+	golang.org/x/net v0.17.0 // indirect
 	golang.org/x/oauth2 v0.5.0 // indirect
-	golang.org/x/sys v0.8.0 // indirect
-	golang.org/x/term v0.8.0 // indirect
-	golang.org/x/text v0.9.0 // indirect
+	golang.org/x/sys v0.13.0 // indirect
+	golang.org/x/term v0.13.0 // indirect
+	golang.org/x/text v0.13.0 // indirect
 	golang.org/x/time v0.3.0 // indirect
 	golang.org/x/tools v0.9.1 // indirect
 	gomodules.xyz/jsonpatch/v2 v2.3.0 // indirect
@@ -110,8 +110,8 @@ require (
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	k8s.io/apiextensions-apiserver v0.27.2 // indirect
-	k8s.io/component-base v0.27.2 // indirect
+	k8s.io/apiextensions-apiserver v0.27.7 // indirect
+	k8s.io/component-base v0.27.7 // indirect
 	k8s.io/klog/v2 v2.90.1 // indirect
 	k8s.io/kube-openapi v0.0.0-20230501164219-8b0f38b5fd1f // indirect
 	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect

go.sum

@@ -705,8 +705,8 @@ golang.org/x/crypto v0.0.0-20201002170205-7f63de1d35b0/go.mod h1:LzIPMQfyMNhhGPh
 golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/crypto v0.0.0-20211215153901-e495a2d5b3d3/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
-golang.org/x/crypto v0.1.0 h1:MDRAIl0xIo9Io2xV565hzXHw3zVseKrJKodhohM5CjU=
-golang.org/x/crypto v0.1.0/go.mod h1:RecgLatLF4+eUMCP1PoPZQb+cVrJcOPbHkTkbkB9sbw=
+golang.org/x/crypto v0.14.0 h1:wBqGXzWJW6m1XrIKlAH0Hs1JJ7+9KBwnIO8v66Q9cHc=
+golang.org/x/crypto v0.14.0/go.mod h1:MVFd36DqK4CsrnJYDkBA3VC4m2GkXAM0PvzMCn4JQf4=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
@@ -797,8 +797,8 @@ golang.org/x/net v0.0.0-20210520170846-37e1c6afe023/go.mod h1:9nx3DQGgdP8bBQD5qx
 golang.org/x/net v0.0.0-20210614182718-04defd469f4e/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20210825183410-e898025ed96a/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.10.0 h1:X2//UzNDwYmtCLn7To6G58Wr6f5ahEAQgKNzv9Y951M=
-golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
+golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
+golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -909,13 +909,13 @@ golang.org/x/sys v0.0.0-20210908233432-aa78b53d3365/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20210917161153-d61c044b1678/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220908164124-27713097b956/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.8.0 h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=
-golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
+golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210220032956-6a3ed077a48d/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.8.0 h1:n5xxQn2i3PC0yLAbjTpNT85q/Kgzcr2gIoX9OrJUols=
-golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
+golang.org/x/term v0.13.0 h1:bb+I9cTfFazGW51MZqBVmZy7+JEJMouUHTUSKVQLBek=
+golang.org/x/term v0.13.0/go.mod h1:LTmsnFJwVN6bCy1rVCoS+qHT1HhALEFxKncY3WNNh4U=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -925,8 +925,8 @@ golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/text v0.9.0 h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=
-golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
+golang.org/x/text v0.13.0 h1:ablQoSUd0tRdKxZewP80B+BaqeKJuVhuRxj/dkrun3k=
+golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -1203,30 +1203,30 @@ honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9
 honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 k8s.io/api v0.21.3/go.mod h1:hUgeYHUbBp23Ue4qdX9tR8/ANi/g3ehylAqDn9NWVOg=
 k8s.io/api v0.22.1/go.mod h1:bh13rkTp3F1XEaLGykbyRD2QaTTzPm0e/BMd8ptFONY=
-k8s.io/api v0.27.4 h1:0pCo/AN9hONazBKlNUdhQymmnfLRbSZjd5H5H3f0bSs=
-k8s.io/api v0.27.4/go.mod h1:O3smaaX15NfxjzILfiln1D8Z3+gEYpjEpiNA/1EVK1Y=
+k8s.io/api v0.27.7 h1:7yG4D3t/q4utJe2ptlRw9aPuxcSmroTsYxsofkQNl/A=
+k8s.io/api v0.27.7/go.mod h1:ZNExI/Lhrs9YrLgVWx6jjHZdoWCTXfBXuFjt1X6olro=
 k8s.io/apiextensions-apiserver v0.21.3/go.mod h1:kl6dap3Gd45+21Jnh6utCx8Z2xxLm8LGDkprcd+KbsE=
 k8s.io/apiextensions-apiserver v0.22.1/go.mod h1:HeGmorjtRmRLE+Q8dJu6AYRoZccvCMsghwS8XTUYb2c=
-k8s.io/apiextensions-apiserver v0.27.2 h1:iwhyoeS4xj9Y7v8YExhUwbVuBhMr3Q4bd/laClBV6Bo=
-k8s.io/apiextensions-apiserver v0.27.2/go.mod h1:Oz9UdvGguL3ULgRdY9QMUzL2RZImotgxvGjdWRq6ZXQ=
+k8s.io/apiextensions-apiserver v0.27.7 h1:YqIOwZAUokzxJIjunmUd4zS1v3JhK34EPXn+pP0/bsU=
+k8s.io/apiextensions-apiserver v0.27.7/go.mod h1:x0p+b5a955lfPz9gaDeBy43obM12s+N9dNHK6+dUL+g=
 k8s.io/apimachinery v0.21.3/go.mod h1:H/IM+5vH9kZRNJ4l3x/fXP/5bOPJaVP/guptnZPeCFI=
 k8s.io/apimachinery v0.22.1/go.mod h1:O3oNtNadZdeOMxHFVxOreoznohCpy0z6mocxbZr7oJ0=
-k8s.io/apimachinery v0.27.4 h1:CdxflD4AF61yewuid0fLl6bM4a3q04jWel0IlP+aYjs=
-k8s.io/apimachinery v0.27.4/go.mod h1:XNfZ6xklnMCOGGFNqXG7bUrQCoR04dh/E7FprV6pb+E=
+k8s.io/apimachinery v0.27.7 h1:Gxgtb7Y/Rsu8ymgmUEaiErkxa6RY4oTd8kNUI6SUR58=
+k8s.io/apimachinery v0.27.7/go.mod h1:jBGQgTjkw99ef6q5hv1YurDd3BqKDk9YRxmX0Ozo0i8=
 k8s.io/apiserver v0.21.3/go.mod h1:eDPWlZG6/cCCMj/JBcEpDoK+I+6i3r9GsChYBHSbAzU=
 k8s.io/apiserver v0.22.1/go.mod h1:2mcM6dzSt+XndzVQJX21Gx0/Klo7Aen7i0Ai6tIa400=
-k8s.io/apiserver v0.27.2 h1:p+tjwrcQEZDrEorCZV2/qE8osGTINPuS5ZNqWAvKm5E=
-k8s.io/apiserver v0.27.2/go.mod h1:EsOf39d75rMivgvvwjJ3OW/u9n1/BmUMK5otEOJrb1Y=
+k8s.io/apiserver v0.27.7 h1:E8sDHwfUug82YC1++qvE73QxihaXDqT4tr8XYBOEtc4=
+k8s.io/apiserver v0.27.7/go.mod h1:OrLG9RwCOerutAlo8QJW5EHzUG9Dad7k6rgcDUNSO/w=
 k8s.io/client-go v0.21.3/go.mod h1:+VPhCgTsaFmGILxR/7E1N0S+ryO010QBeNCv5JwRGYU=
 k8s.io/client-go v0.22.1/go.mod h1:BquC5A4UOo4qVDUtoc04/+Nxp1MeHcVc1HJm1KmG8kk=
-k8s.io/client-go v0.27.4 h1:vj2YTtSJ6J4KxaC88P4pMPEQECWMY8gqPqsTgUKzvjk=
-k8s.io/client-go v0.27.4/go.mod h1:ragcly7lUlN0SRPk5/ZkGnDjPknzb37TICq07WhI6Xc=
+k8s.io/client-go v0.27.7 h1:+Xgh9OOKv6A3qdD4Dnl/0VOI5EvAv+0s/OseDxVVTwQ=
+k8s.io/client-go v0.27.7/go.mod h1:dZ2kqcalYp5YZ2EV12XIMc77G6PxHWOJp/kclZr4+5Q=
 k8s.io/code-generator v0.21.3/go.mod h1:K3y0Bv9Cz2cOW2vXUrNZlFbflhuPvuadW6JdnN6gGKo=
 k8s.io/code-generator v0.22.1/go.mod h1:eV77Y09IopzeXOJzndrDyCI88UBok2h6WxAlBwpxa+o=
 k8s.io/component-base v0.21.3/go.mod h1:kkuhtfEHeZM6LkX0saqSK8PbdO7A0HigUngmhhrwfGQ=
 k8s.io/component-base v0.22.1/go.mod h1:0D+Bl8rrnsPN9v0dyYvkqFfBeAd4u7n77ze+p8CMiPo=
-k8s.io/component-base v0.27.2 h1:neju+7s/r5O4x4/txeUONNTS9r1HsPbyoPBAtHsDCpo=
-k8s.io/component-base v0.27.2/go.mod h1:5UPk7EjfgrfgRIuDBFtsEFAe4DAvP3U+M8RTzoSJkpo=
+k8s.io/component-base v0.27.7 h1:kngM58HR9W9Nqpv7e4rpdRyWnKl/ABpUhLAZ+HoliMs=
+k8s.io/component-base v0.27.7/go.mod h1:YGjlCVL1oeKvG3HSciyPHFh+LCjIEqsxz4BDR3cfHRs=
 k8s.io/gengo v0.0.0-20200413195148-3a45101e95ac/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
 k8s.io/gengo v0.0.0-20201214224949-b6c5ce23f027/go.mod h1:FiNAH4ZV3gBg2Kwh89tzAEV2be7d5xI0vBa/VySYy3E=
 k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=
@@ -1250,8 +1250,8 @@ rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.19/go.mod h1:LEScyzhFmoF5pso/YSeBstl57mOzx9xlU9n85RGrDQg=
 sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.22/go.mod h1:LEScyzhFmoF5pso/YSeBstl57mOzx9xlU9n85RGrDQg=
 sigs.k8s.io/controller-runtime v0.10.0/go.mod h1:GCdh6kqV6IY4LK0JLwX0Zm6g233RtVGdb/f0+KSfprg=
-sigs.k8s.io/controller-runtime v0.15.1 h1:9UvgKD4ZJGcj24vefUFgZFP3xej/3igL9BsOUTb/+4c=
-sigs.k8s.io/controller-runtime v0.15.1/go.mod h1:7ngYvp1MLT+9GeZ+6lH3LOlcHkp/+tzA/fmHa4iq9kk=
+sigs.k8s.io/controller-runtime v0.15.3 h1:L+t5heIaI3zeejoIyyvLQs5vTVu/67IU2FfisVzFlBc=
+sigs.k8s.io/controller-runtime v0.15.3/go.mod h1:kp4jckA4vTx281S/0Yk2LFEEQe67mjg+ev/yknv47Ds=
 sigs.k8s.io/controller-runtime/tools/setup-envtest v0.0.0-20220602164547-f46919744bee h1:TZhNgC8PBcVC1IjCDVl6hnvx0GaVfTuIN0NJLaeagyQ=
 sigs.k8s.io/controller-runtime/tools/setup-envtest v0.0.0-20220602164547-f46919744bee/go.mod h1:nLkMD2WB4Jcix1qfVuJeOF4j5y/VfyeOIlTxG5Wj9co=
 sigs.k8s.io/controller-tools v0.6.2 h1:+Y8L0UsAugDipGRw8lrkPoAi6XqlQVZuf1DQHME3PgU=

main.go

@@ -49,6 +49,7 @@ func main() {
 	flag.StringVar(&opCfg.HealthProbeBindAddress, "health-probe-bind-addr", operatorconfig.DefaultHealthProbeAddr, "The address the health endpoint binds to.")
 	flag.IntVar(&opCfg.RequeuePeriodSeconds, "requeue-period", operatorconfig.DefaultRequeuePeriodSeconds, "Requeue period for a failed reconciliation (in seconds).")
 	flag.BoolVar(&opCfg.EnableLeaderElection, "leader-elect", operatorconfig.DefaultEnableLeaderElection, "Enable leader election for controller manager to ensure there is only one active controller manager.")
+	flag.BoolVar(&opCfg.WebhookDisableHTTP2, "webhook-disable-http2", false, "Disable HTTP/2 for the webhook server.")
 	opts := zap.Options{
 		Development: true,
 	}

pkg/operator/config/config.go

@@ -96,6 +96,9 @@ type Config struct {
 
 	// EnableLeaderElection enables the controller runtime's leader election.
 	EnableLeaderElection bool
+
+	// WebhookDisableHTTP2 disables HTTP2 for the webhook server.
+	WebhookDisableHTTP2 bool
 }
 
 // DetectPlatform detects the underlying platform and fills corresponding config fields

pkg/operator/operator.go

@@ -18,14 +18,15 @@ package operator
 
 import (
 	"context"
-
+	"crypto/tls"
 	"fmt"
 
 	"k8s.io/client-go/rest"
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/cache"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/manager"
+	"sigs.k8s.io/controller-runtime/pkg/webhook"
 
 	operatorv1beta1 "github.com/openshift/external-dns-operator/api/v1beta1"
 	operatorconfig "github.com/openshift/external-dns-operator/pkg/operator/config"
@@ -54,6 +55,16 @@ type Operator struct {
 
 // New creates a new operator from cliCfg and opCfg.
 func New(cliCfg *rest.Config, opCfg *operatorconfig.Config) (*Operator, error) {
+	webhookSrv := webhook.NewServer(webhook.Options{
+		TLSOpts: []func(config *tls.Config){
+			func(config *tls.Config) {
+				if opCfg.WebhookDisableHTTP2 {
+					config.NextProtos = []string{"http/1.1"}
+				}
+			},
+		},
+	})
+
 	mgrOpts := manager.Options{
 		Scheme:                 GetOperatorScheme(),
 		MetricsBindAddress:     opCfg.MetricsBindAddress,
@@ -79,6 +90,7 @@ func New(cliCfg *rest.Config, opCfg *operatorconfig.Config) (*Operator, error) {
 		},
 		LeaderElection:   opCfg.EnableLeaderElection,
 		LeaderElectionID: "leaderelection.externaldns.olm.openshift.io",
+		WebhookServer:    webhookSrv,
 	}
 
 	mgr, err := ctrl.NewManager(cliCfg, mgrOpts)