From 7468c09aaef875d205152eb5bfc3efd103563d2b Mon Sep 17 00:00:00 2001
From: Aldo Lacuku <aldo@lacuku.eu>
Date: Tue, 28 Jun 2022 15:36:50 +0200
Subject: [PATCH] new(event-generator): initial commit

Signed-off-by: Aldo Lacuku <aldo@lacuku.eu>
---
 event-generator/.helmignore                | 23 +++++++
 event-generator/Chart.yaml                 | 24 +++++++
 event-generator/templates/_helpers.tpl     | 69 ++++++++++++++++++++
 event-generator/templates/deployment.yaml  | 15 +++++
 event-generator/templates/job.yaml         | 12 ++++
 event-generator/templates/pod-template.tpl | 66 +++++++++++++++++++
 event-generator/templates/rbac.yaml        | 76 ++++++++++++++++++++++
 event-generator/values.yaml                | 69 ++++++++++++++++++++
 8 files changed, 354 insertions(+)
 create mode 100644 event-generator/.helmignore
 create mode 100644 event-generator/Chart.yaml
 create mode 100644 event-generator/templates/_helpers.tpl
 create mode 100644 event-generator/templates/deployment.yaml
 create mode 100644 event-generator/templates/job.yaml
 create mode 100644 event-generator/templates/pod-template.tpl
 create mode 100644 event-generator/templates/rbac.yaml
 create mode 100644 event-generator/values.yaml

diff --git a/event-generator/.helmignore b/event-generator/.helmignore
new file mode 100644
index 000000000..0e8a0eb36
--- /dev/null
+++ b/event-generator/.helmignore
@@ -0,0 +1,23 @@
+# 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
+*.bak
+*.tmp
+*.orig
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/
diff --git a/event-generator/Chart.yaml b/event-generator/Chart.yaml
new file mode 100644
index 000000000..4fbff554b
--- /dev/null
+++ b/event-generator/Chart.yaml
@@ -0,0 +1,24 @@
+apiVersion: v2
+name: event-generator
+description: A Helm chart for Kubernetes
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "0.9.0"
diff --git a/event-generator/templates/_helpers.tpl b/event-generator/templates/_helpers.tpl
new file mode 100644
index 000000000..dcc11efa5
--- /dev/null
+++ b/event-generator/templates/_helpers.tpl
@@ -0,0 +1,69 @@
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "event-generator.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "event-generator.fullname" -}}
+{{- if .Values.fullnameOverride }}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- $name := default .Chart.Name .Values.nameOverride }}
+{{- if contains $name .Release.Name }}
+{{- .Release.Name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}
+{{- end }}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "event-generator.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "event-generator.labels" -}}
+helm.sh/chart: {{ include "event-generator.chart" . }}
+{{ include "event-generator.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service | quote }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "event-generator.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "event-generator.name" . | quote }}
+app.kubernetes.io/instance: {{ .Release.Name | quote }}
+app.kubernetes.io/part-of: {{ include "event-generator.name" . | quote }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "event-generator.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "event-generator.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}
+
+{{- define "grpc.unixSocketDir" -}}
+{{- if and .Values.config.grpc.enabled .Values.config.grpc.bindAddress (hasPrefix "unix://" .Values.config.grpc.bindAddress) -}}
+{{- .Values.config.grpc.bindAddress | trimPrefix "unix://" | dir -}}
+{{- end -}}
+{{- end -}}
\ No newline at end of file
diff --git a/event-generator/templates/deployment.yaml b/event-generator/templates/deployment.yaml
new file mode 100644
index 000000000..e56066c4d
--- /dev/null
+++ b/event-generator/templates/deployment.yaml
@@ -0,0 +1,15 @@
+{{- if .Values.config.loop -}}
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "event-generator.fullname" . }}
+  labels:
+    {{- include "event-generator.labels" . | nindent 4 }}
+spec:
+  replicas: {{ .Values.replicasCount }}
+  selector:
+    matchLabels:
+      {{- include "event-generator.selectorLabels" . | nindent 6 }}
+  template:
+    {{- include "event-generator.podTemplate" . | nindent 4 }}
+{{- end -}}
\ No newline at end of file
diff --git a/event-generator/templates/job.yaml b/event-generator/templates/job.yaml
new file mode 100644
index 000000000..fad404206
--- /dev/null
+++ b/event-generator/templates/job.yaml
@@ -0,0 +1,12 @@
+{{- if not .Values.config.loop -}}
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: {{ include "event-generator.fullname" . }}
+  labels:
+    {{- include "event-generator.labels" . | nindent 4 }}
+spec:
+  backoffLimit: 1
+  template:
+    {{- include "event-generator.podTemplate" . | nindent 4 }}
+{{- end -}}
\ No newline at end of file
diff --git a/event-generator/templates/pod-template.tpl b/event-generator/templates/pod-template.tpl
new file mode 100644
index 000000000..5c63b9b41
--- /dev/null
+++ b/event-generator/templates/pod-template.tpl
@@ -0,0 +1,66 @@
+{{- define "event-generator.podTemplate" -}}
+metadata:
+  {{- with .Values.podAnnotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  labels:
+    {{- include "event-generator.selectorLabels" . | nindent 4 }}
+spec:
+  {{- with .Values.imagePullSecrets }}
+  imagePullSecrets:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  serviceAccountName: {{ include "event-generator.fullname" . }}
+  securityContext:
+    {{- toYaml .Values.podSecurityContext | nindent 4 }}
+  containers:
+    - name: {{ .Chart.Name }}
+      securityContext:
+        {{- toYaml .Values.securityContext | nindent 8 }}
+      image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
+      imagePullPolicy: {{ .Values.image.pullPolicy }}
+      command: 
+        - /bin/event-generator 
+        - {{ .Values.config.command }}
+        {{- if .Values.config.actions }}
+        - {{ .Values.config.actions }}
+        {{- end }}
+        {{- if .Values.config.loop }}
+        - --loop
+        {{- end }}
+        {{- if .Values.config.grpc.enabled }}
+        - --grpc-unix-socket={{- .Values.config.grpc.bindAddress }}
+        {{- end }}
+      env:
+      - name: FALCO_EVENT_GENERATOR_NAMESPACE
+        valueFrom:
+          fieldRef:
+            fieldPath: metadata.namespace
+      {{- if .Values.config.grpc.enabled }}
+      volumeMounts:
+      - mountPath: {{ include "grpc.unixSocketDir" . }} 
+        name: unix-socket-dir
+      {{- end }}
+  {{- if .Values.config.grpc.enabled }}
+  volumes:
+  - hostPath:
+      path: {{ include "grpc.unixSocketDir" . }} 
+    name: unix-socket-dir       
+  {{- end }}          
+  {{- with .Values.nodeSelector }}
+  nodeSelector:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  {{- with .Values.affinity }}
+  affinity:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  {{- with .Values.tolerations }}
+  tolerations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  {{- if not .Values.config.loop }}
+  restartPolicy: Never
+  {{- end }}
+{{- end -}}
diff --git a/event-generator/templates/rbac.yaml b/event-generator/templates/rbac.yaml
new file mode 100644
index 000000000..cf2b2596e
--- /dev/null
+++ b/event-generator/templates/rbac.yaml
@@ -0,0 +1,76 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: {{ include "event-generator.fullname" . }}
+  labels:
+    {{- include "event-generator.labels" . | nindent 4 }}
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: {{ include "event-generator.fullname" . }}
+  labels:
+    {{- include "event-generator.labels" . | nindent 4 }}
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - configmaps
+  - services
+  - serviceaccounts
+  - pods
+  verbs:
+  - list
+  - get
+  - create
+  - delete
+- apiGroups:
+  - apps
+  - extensions
+  resources:
+  - deployments
+  verbs:
+  - list
+  - get
+  - create
+  - delete
+- apiGroups:
+  - rbac.authorization.k8s.io
+  resources:
+  - roles
+  - rolebindings
+  verbs:
+  - get
+  - list
+  - create
+  - delete
+# These are only so the event generator can create roles that have these properties.
+# It will result in a falco alert for the rules "ClusterRole With Wildcard Created", "ClusterRole With Pod Exec Created"
+- apiGroups:
+  - ""
+  resources:
+  - pods/exec
+  verbs:
+  - get
+- apiGroups:
+  - ""
+  resources:
+  - '*'
+  verbs:
+  - get
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: {{ include "event-generator.fullname" . }}
+  labels:
+    {{- include "event-generator.labels" . | nindent 4 }}
+subjects:
+  - kind: ServiceAccount
+    name: {{ include "event-generator.fullname" . }}
+    namespace: {{ .Release.Namespace }}
+roleRef:
+  kind: ClusterRole
+  name: {{ include "event-generator.fullname" . }}
+  apiGroup: rbac.authorization.k8s.io
+---
diff --git a/event-generator/values.yaml b/event-generator/values.yaml
new file mode 100644
index 000000000..e7adb0cd6
--- /dev/null
+++ b/event-generator/values.yaml
@@ -0,0 +1,69 @@
+# Default values for event-generator.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+
+# -- Number of replicas of the event-generator (meaningful when installed as a deployment).
+replicasCount: 1
+
+image:
+  # -- Repository from where the image is pulled.
+  repository: falcosecurity/event-generator
+  # -- Pull policy for the event-generator image
+  pullPolicy: IfNotPresent
+  # -- Images' tag to select a development/custom version of event-generator instead of a release.
+  # Overrides the image tag whose default is the chart appVersion.
+  tag: ""
+
+# -- Secrets used to pull the image from a private repository.
+imagePullSecrets: []
+# -- Used to override the chart name.
+nameOverride: ""
+# -- Used to override the chart full name.
+fullnameOverride: ""
+
+# -- Annotations to be added to the pod.
+podAnnotations: {}
+
+# -- Security context for the pod.
+podSecurityContext: {}
+  # fsGroup: 2000
+
+# -- Security context for the containers.
+securityContext: {}
+  # capabilities:
+  #   drop:
+  #   - ALL
+  # readOnlyRootFilesystem: true
+  # runAsNonRoot: true
+  # runAsUser: 1000
+
+# -- Selectors to choose a given node where to run the pods.
+nodeSelector: {}
+
+# -- Tolerations to allow the pods to be scheduled on nodes whose taints the pod tolerates.
+tolerations: []
+
+# -- Affinity, like the nodeSelector but with more expressive syntax.
+affinity: {}
+
+config:
+  # -- The event-generator accepts two commands (run, test): 
+  # run: runs actions.
+  # test: runs and tests actions.
+  # For more info see: https://github.com/falcosecurity/event-generator
+  command: test
+  # -- Regular expression used to select the actions to be run.
+  actions: "^syscall"
+  # -- Runs in a loop the actions.
+  # If set to "true" the event-generator is deployed using a k8s deployment otherwise a k8s job.
+  loop: false
+  # -- The length of time to wait before running an action. Non-zero values should contain 
+  # a corresponding time unit (e.g. 1s, 2m, 3h). A value of zero means no sleep. (default 100ms)
+  sleep: ""
+  
+  grpc:
+    # -- Set it to true if you are deploying in "test" mode.
+    enabled: true
+    # -- Path to the Falco grpc socket.
+    bindAddress: "unix:///var/run/falco/falco.sock"
+