core: fix openshift security context

The MKNOD capability was missing and due to recent addition some pod now
only require this cap as well as privileged.
The cap must be explicitly exposed so it can be requested by a pod.

Closes: #9234
Signed-off-by: Sébastien Han <seb@redhat.com>
(cherry picked from commit b38f430)

# Conflicts:
#	cluster/examples/kubernetes/ceph/operator-openshift.yaml
#	pkg/apis/ceph.rook.io/v1/scc.go

cluster/examples/kubernetes/ceph/operator-openshift.yaml

@@ -14,9 +14,13 @@ allowPrivilegedContainer: true
 allowHostNetwork: true
 allowHostDirVolumePlugin: true
 priority:
+<<<<<<< HEAD
 allowedCapabilities: []
 allowHostPorts: true
 allowHostPID: true # remove this once we drop support for Nautilus
+=======
+allowedCapabilities: ["MKNOD"]
+>>>>>>> b38f430c2 (core: fix openshift security context)
 allowHostIPC: true
 readOnlyRootFilesystem: false
 requiredDropCapabilities: []

pkg/apis/ceph.rook.io/v1/scc.go

@@ -0,0 +1,76 @@
+/*
+Copyright 2021 The Rook Authors. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1
+
+import (
+	"fmt"
+
+	secv1 "github.com/openshift/api/security/v1"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// NewSecurityContextConstraints returns a new SecurityContextConstraints for Rook-Ceph to run on
+// OpenShift.
+func NewSecurityContextConstraints(name, namespace string) *secv1.SecurityContextConstraints {
+	return &secv1.SecurityContextConstraints{
+		TypeMeta: metav1.TypeMeta{
+			APIVersion: "security.openshift.io/v1",
+			Kind:       "SecurityContextConstraints",
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      name,
+			Namespace: namespace,
+		},
+		AllowPrivilegedContainer: true,
+		AllowHostDirVolumePlugin: true,
+		ReadOnlyRootFilesystem:   false,
+		AllowHostIPC:             true,
+		AllowHostNetwork:         false,
+		AllowHostPorts:           false,
+		AllowedCapabilities:      []corev1.Capability{"MKNOD"},
+		RequiredDropCapabilities: []corev1.Capability{},
+		DefaultAddCapabilities:   []corev1.Capability{},
+		RunAsUser: secv1.RunAsUserStrategyOptions{
+			Type: secv1.RunAsUserStrategyRunAsAny,
+		},
+		SELinuxContext: secv1.SELinuxContextStrategyOptions{
+			Type: secv1.SELinuxStrategyMustRunAs,
+		},
+		FSGroup: secv1.FSGroupStrategyOptions{
+			Type: secv1.FSGroupStrategyMustRunAs,
+		},
+		SupplementalGroups: secv1.SupplementalGroupsStrategyOptions{
+			Type: secv1.SupplementalGroupsStrategyRunAsAny,
+		},
+		Volumes: []secv1.FSType{
+			secv1.FSTypeConfigMap,
+			secv1.FSTypeDownwardAPI,
+			secv1.FSTypeEmptyDir,
+			secv1.FSTypeHostPath,
+			secv1.FSTypePersistentVolumeClaim,
+			secv1.FSProjected,
+			secv1.FSTypeSecret,
+		},
+		Users: []string{
+			fmt.Sprintf("system:serviceaccount:%s:rook-ceph-system", namespace),
+			fmt.Sprintf("system:serviceaccount:%s:default", namespace),
+			fmt.Sprintf("system:serviceaccount:%s:rook-ceph-mgr", namespace),
+			fmt.Sprintf("system:serviceaccount:%s:rook-ceph-osd", namespace),
+		},
+	}
+}