Add PodSecurityPolicy chart

This adds a chart that will generate arbitrary Kubernetes
PodSecurityPolicy objects, and ClusterRoles to provide access to them.
It will also set up one (or zero) default bindings for generic
"categories" of subjects, as desired:
- serviceaccounts
- authenticated users
- unauthenticated users

The default values specify a highly permissive security policy that is
bound by default to serviceaccounts and authenticated users.  The policy
is expected to be refined over time, and should be overridden by
operators per their workloads and security needs.

Change-Id: I69917217f85881b2627706abce66c7044b40a448

podsecuritypolicy/.helmignore

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+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.pyc
+*.bak
+*.tmp
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj

podsecuritypolicy/Chart.yaml

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+# Copyright 2018, AT&T Intellectual Property
+#
+# 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.
+
+apiVersion: v1
+description: OpenStack-Helm PodSecurityPolicy Chart
+name: podsecuritypolicy
+version: 0.1.0
+home: https://kubernetes.io/docs/concepts/policy/pod-security-policy/
+maintainers:
+  - name: OpenStack-Helm Authors

podsecuritypolicy/requirements.yaml

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+# Copyright 2018, AT&T Intellectual Property
+#
+# 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.
+
+dependencies:
+  - name: helm-toolkit
+    repository: http://localhost:8879/charts
+    version: 0.1.0

podsecuritypolicy/templates/podsecuritypolicy.yaml

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+{{/*
+Copyright 2018, AT&T Intellectual Property
+
+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.
+*/}}
+
+{{- if .Values.manifests.podsecuritypolicy }}
+{{- $envAll := . }}
+
+{{/* Create one ClusterRole and PSP per PSP definition in values */}}
+{{- range $pspName, $pspDetails := .Values.data }}
+---
+apiVersion: extensions/v1beta1
+kind: PodSecurityPolicy
+metadata:
+  name: {{ $pspName }}
+  labels:
+{{ tuple $envAll "podsecuritypolicy" "policy" | include "helm-toolkit.snippets.kubernetes_metadata_labels" | indent 4 }}
+spec:
+{{ toYaml $pspDetails | indent 2 }}
+---
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: {{ $pspName }}
+  labels:
+{{ tuple $envAll "podsecuritypolicy" "policy" | include "helm-toolkit.snippets.kubernetes_metadata_labels" | indent 4 }}
+rules:
+- apiGroups: ['policy']
+  resources: ['podsecuritypolicies']
+  verbs:     ['use']
+  resourceNames:
+  - {{ $pspName }}
+{{- end }}
+
+{{/* Configure ClusterRoles to bind to different subjects as defaults */}}
+{{- range $rbacSubject, $defaultRole := .Values.conf.defaults }}
+{{ if and $defaultRole (not (eq "nil" $defaultRole)) }}
+---
+kind: ClusterRoleBinding
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+{{/* NOTE: the role name is included in the name of the binding below
+     for the sake of chart upgrades.  The roleRef for a binding is immutable,
+     so if the the defaultRole changes, we need a different binding to
+     reflect that. This issue was only sporadic! */}}
+  name: psp-binding-for-{{- $rbacSubject -}}-{{- $defaultRole }}
+  labels:
+{{ tuple $envAll "podsecuritypolicy" "policy" | include "helm-toolkit.snippets.kubernetes_metadata_labels" | indent 4 }}
+roleRef:
+  kind: ClusterRole
+  name: {{ $defaultRole }}
+  apiGroup: rbac.authorization.k8s.io
+subjects:
+- kind: Group
+  name: system:{{- $rbacSubject }}
+  apiGroup: rbac.authorization.k8s.io
+{{- end }}
+{{- end }}
+{{- end }}

podsecuritypolicy/values.yaml

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+# Copyright 2018, AT&T Intellectual Property
+#
+# 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.
+
+conf:
+  # This defines creation of ClusterRoleBindings that configure
+  # default PodSecurityPolicies for the subjects below.
+  # `nil` avoids creation of a default binding for the subject.
+  #
+  defaults:
+    serviceaccounts: psp-default
+    authenticated: psp-default
+    unauthenticated: nil
+
+data:
+  # Each of these corresponds to the `spec` of a PodSecurityPolicy object.
+  # Note that this default PodSecurityPolicy is incredibly permissive.  It is
+  # intended to be tuned over time as a default, and to be overridden by
+  # operators as appropriate.
+  #
+  # A ClusterRole will be created for the PSP, with the same `metadata.name`.
+  #
+  # Note: you can define as many PSPs here as you need.
+  #
+  psp-default:  # This will be the `metadata.name` of the PodSecurityPolicy
+    privileged: true
+    allowPrivilegeEscalation: true
+    hostNetwork: true
+    hostPID: true
+    hostIPC: true
+    seLinux:
+      rule: RunAsAny
+    supplementalGroups:
+      rule: RunAsAny
+    runAsUser:
+      rule: RunAsAny
+    fsGroup:
+      rule: RunAsAny
+    volumes:
+    - '*'
+    allowedCapabilities:
+    - '*'
+    hostPorts:
+    - min: 1
+      max: 65536
+manifests:
+  podsecuritypolicy: true