feat: add more validation models about containers and services

Signed-off-by: peefy <xpf6677@163.com>

examples/mutation/readonly-root-fs/kcl.mod

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+[package]
+name = "readonly-root-fs"
+version = "0.0.1"

examples/mutation/readonly-root-fs/main.k

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+schema Params:
+
+params: Params = option("params")
+items = [item | {
+    if item.kind == "Pod":
+        spec.containers: [{
+            securityContext.readOnlyRootFilesystem = True
+        } for container in item.spec.containers]
+} for item in option("items") or []]

examples/mutation/readonly-root-fs/suite/good.yaml

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+apiVersion: krm.kcl.dev/v1alpha1
+kind: KCLRun
+metadata:
+  name: readonly-root-fs
+  annotations: 
+    krm.kcl.dev/version: 0.0.1
+    krm.kcl.dev/type: mutation
+    documentation: >-
+      Set read only root file system for containers
+spec:
+  source: ./examples/mutation/readonly-root-fs/main.k
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: nginx
+spec:
+  containers:
+  - name: nginx
+    image: nginx:1.14.2
+    ports:
+    - containerPort: 80

examples/validation/allowed-image-repos/kcl.mod

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+[package]
+name = "allowed-image-repos"
+version = "0.0.1"

examples/validation/allowed-image-repos/main.k

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+"""Requires container images to begin with a string from the specified list.
+
+Ref: https://github.com/open-policy-agent/gatekeeper-library/blob/master/src/general/allowedrepos/constraint.tmpl
+"""
+
+# The list of prefixes a container image is allowed to have.
+repos: [str] = option("params").repos or []
+
+# Define the validation function
+validate = lambda item {
+    containers = []
+    if item.kind == "Pod" and repos:
+        containers = (item.spec.containers or []) + (item.spec.phemeralContainers or []) + (item.spec.initContainers or [])
+    elif item.kind == "Deployment":
+        containers = (item.spec.template.spec.containers or []) + (item.spec.template.spec.phemeralContainers or []) + (item.spec.template.spec.initContainers or [])
+    images: [str] = [c.image for c in containers]
+    assert all image in images {
+        all repo in repos {
+            image.startswith(repo)
+        }
+    } if images and repos, """Use of image is disallowed for ${item.kind}: ${item.metadata.name}, valid repos ${repos}"""
+    item
+}
+# Validate All resource
+items = [validate(i) for i in option("items")]

examples/validation/allowed-image-repos/suite/bad.yaml

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+apiVersion: krm.kcl.dev/v1alpha1
+kind: KCLRun
+metadata:
+  name: allowed-image-repos
+  annotations: 
+    krm.kcl.dev/version: 0.0.1
+    krm.kcl.dev/type: validation
+    documentation: >-
+      Requires container images to begin with a string from the specified list.
+
+      Ref: https://github.com/open-policy-agent/gatekeeper-library/blob/master/src/general/allowedrepos/constraint.tmpl
+spec:
+  params:
+    repos:
+    - nginx
+  source: ./examples/validation/allowed-image-repos/main.k
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: my-deploy
+  labels:
+    app: kcl
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: kcl
+  template:
+    metadata:
+      labels:
+        app: kcl
+    spec:
+      containers:
+      - name: kcl
+        image: kcllang/kcl
+        ports:
+        - containerPort: 80

examples/validation/allowed-image-repos/suite/good.yaml

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+apiVersion: krm.kcl.dev/v1alpha1
+kind: KCLRun
+metadata:
+  name: allowed-image-repos
+  annotations: 
+    krm.kcl.dev/version: 0.0.1
+    krm.kcl.dev/type: validation
+    documentation: >-
+      Requires container images to begin with a string from the specified list.
+
+      Ref: https://github.com/open-policy-agent/gatekeeper-library/blob/master/src/general/allowedrepos/constraint.tmpl
+spec:
+  params:
+    repos:
+    - nginx
+  source: ./examples/validation/allowed-image-repos/main.k
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: my-deploy
+  labels:
+    app: nginx
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:1.14.2
+        ports:
+        - containerPort: 80

examples/validation/deny-all/kcl.mod

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+[package]
+name = "deny-all"
+version = "0.0.1"

examples/validation/deny-all/main.k

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+assert False if option("items"), "Deny all objects and the input object list is ${option('items')}"

examples/validation/deny-all/suite/bad.yaml

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+apiVersion: krm.kcl.dev/v1alpha1
+kind: KCLRun
+metadata:
+  name: deny-all
+  annotations: 
+    krm.kcl.dev/version: 0.0.1
+    krm.kcl.dev/type: validation
+    documentation: >-
+      Deny all objects if there are input objects.
+spec:
+  source: ./examples/validation/deny-all/main.k
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: nginx
+spec:
+  containers:
+  - name: nginx
+    image: nginx:1.14.2
+    ports:
+    - containerPort: 80
+    livenessProbe:
+      exec:
+        command:
+        - ps

examples/validation/deny-all/suite/good.yaml

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+apiVersion: krm.kcl.dev/v1alpha1
+kind: KCLRun
+metadata:
+  name: deny-all
+  annotations: 
+    krm.kcl.dev/version: 0.0.1
+    krm.kcl.dev/type: validation
+    documentation: >-
+      Deny all objects if there are input objects.
+spec:
+  source: ./examples/validation/deny-all/main.k

examples/validation/deny-endpoint-edit-default-role/kcl.mod

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+[package]
+name = "deny-endpoint-edit-default-role"
+version = "0.0.1"

examples/validation/deny-endpoint-edit-default-role/main.k

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+"""Many Kubernetes installations by default have a system:aggregate-to-edit
+ClusterRole which does not properly restrict access to editing Endpoints.
+This ConstraintTemplate forbids the system:aggregate-to-edit ClusterRole
+from granting permission to create/patch/update Endpoints.
+
+ClusterRole/system:aggregate-to-edit should not allow
+Endpoint edit permissions due to CVE-2021-25740, Endpoint & EndpointSlice
+permissions allow cross-Namespace forwarding,
+https://github.com/kubernetes/kubernetes/issues/103675
+
+Reference: https://github.com/open-policy-agent/gatekeeper-library/blob/master/library/general/block-endpoint-edit-default-role/template.yaml
+"""
+
+# Define the validation function
+validate = lambda item {
+    if (item?.metadata?.name or "") == "system:aggregate-to-edit":
+        rules = item.rules or []
+        # Check all rules if rules exist
+        assert all rule in rules {
+            # Check evrey rule verbs if rule resources exist "endpoints"
+            all res in rule.resources {
+                # Check every verbs
+                all verb in rule.verbs {
+                    verb not in ["create", "patch", "update"]
+                } if rule.verbs and res == "endpoints"
+            } if rule.resources
+        } if rules, "ClusterRole system:aggregate-to-edit should not allow endpoint edit permissions. For k8s version < 1.22, the Cluster Role should be annotated with rbac.authorization.kubernetes.io/autoupdate=false to prevent autoreconciliation back to default permissions for this role."
+    item
+}
+
+# Validate All resource
+items = [validate(i) for i in option("items")]

examples/validation/deny-endpoint-edit-default-role/suite/bad.yaml

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+apiVersion: krm.kcl.dev/v1alpha1
+kind: KCLRun
+metadata:
+  name: deny-endpoint-edit-default-role
+  annotations: 
+    krm.kcl.dev/version: 0.0.1
+    krm.kcl.dev/type: validation
+    documentation: >-
+      Many Kubernetes installations by default have a system:aggregate-to-edit
+      ClusterRole which does not properly restrict access to editing Endpoints.
+      This ConstraintTemplate forbids the system:aggregate-to-edit ClusterRole
+      from granting permission to create/patch/update Endpoints.
+
+      ClusterRole/system:aggregate-to-edit should not allow
+      Endpoint edit permissions due to CVE-2021-25740, Endpoint & EndpointSlice
+      permissions allow cross-Namespace forwarding,
+      https://github.com/kubernetes/kubernetes/issues/103675
+
+      Reference: https://github.com/open-policy-agent/gatekeeper-library/blob/master/library/general/block-endpoint-edit-default-role/template.yaml
+spec:
+  source: ./examples/validation/deny-endpoint-edit-default-role/main.k
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: nginx
+spec:
+  containers:
+  - name: nginx
+    image: nginx:1.14.2
+    ports:
+    - containerPort: 80
+    livenessProbe:
+      exec:
+        command:
+        - ps
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  annotations:
+    rbac.authorization.kubernetes.io/autoupdate: "true"
+  creationTimestamp: null
+  labels:
+    kubernetes.io/bootstrapping: rbac-defaults
+    rbac.authorization.k8s.io/aggregate-to-edit: "true"
+  name: system:aggregate-to-edit
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - pods/attach
+  - pods/exec
+  - pods/portforward
+  - pods/proxy
+  - secrets
+  - services/proxy
+  verbs:
+  - get
+  - list
+  - watch
+- apiGroups:
+  - ""
+  resources:
+  - serviceaccounts
+  verbs:
+  - impersonate
+- apiGroups:
+  - ""
+  resources:
+  - pods
+  - pods/attach
+  - pods/exec
+  - pods/portforward
+  - pods/proxy
+  verbs:
+  - create
+  - delete
+  - deletecollection
+  - patch
+  - update
+- apiGroups:
+  - ""
+  resources:
+  - configmaps
+  - persistentvolumeclaims
+  - replicationcontrollers
+  - replicationcontrollers/scale
+  - secrets
+  - serviceaccounts
+  - services
+  - services/proxy
+  verbs:
+  - create
+  - delete
+  - deletecollection
+  - patch
+  - update
+- apiGroups:
+  - apps
+  resources:
+  - daemonsets
+  - deployments
+  - deployments/rollback
+  - deployments/scale
+  - endpoints
+  - replicasets
+  - replicasets/scale
+  - statefulsets
+  - statefulsets/scale
+  verbs:
+  - create
+  - delete
+  - deletecollection
+  - patch
+  - update