securing-helm-chart-deployments

Secure Helm chart deployments by validating chart integrity, scanning templates for misconfigurations, and enforcing security contexts in Kubernetes releases. Use when working with securing helm chart deployments.

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Repository: oyi77/1ai-skills
Last source activity: July 31, 2026 at 15:22
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name	securing-helm-chart-deployments
description	Secure Helm chart deployments by validating chart integrity, scanning templates for misconfigurations, and enforcing security contexts in Kubernetes releases. Use when working with securing helm chart deployments.
domain	cybersecurity
subdomain	container-security
tags	["helm","kubernetes","chart-security","supply-chain","configuration-security","deployment"]
version	1.0
author	oyi77
license	Apache-2.0
nist_csf	["PR.PS-01","PR.IR-01","ID.AM-08","DE.CM-01"]

Securing Helm Chart Deployments

Overview

Helm is the Kubernetes package manager. Securing Helm deployments requires validating chart provenance, scanning templates for security misconfigurations, enforcing pod security contexts, managing secrets securely, and controlling RBAC for Helm operations.

When to Use

Trigger phrases:

"securing helm chart deployments"
"Secure Helm chart deployments by validating chart integrity, scanning templates "
When deploying or configuring securing helm chart deployments capabilities in your environment
When establishing security controls aligned to compliance requirements
When building or improving security architecture for this domain
When conducting security assessments that require this implementation

Prerequisites

Helm 3.12+ installed
kubectl with cluster access
GnuPG for chart signing/verification
kubesec or checkov for template scanning

Chart Provenance and Integrity

This section covers chart provenance and integrity for securing helm chart deployments.

Ensure all prerequisites are met before proceeding
Follow the documented workflow steps in sequence
Record results and any anomalies encountered during this phase

Sign a Helm Chart

# Generate GPG key for signing
gpg --full-generate-key

# Package and sign chart
helm package ./mychart --sign --key "helm-signing@example.com" --keyring ~/.gnupg/pubring.gpg

# Verify chart signature
helm verify mychart-0.1.0.tgz --keyring ~/.gnupg/pubring.gpg

Verify Chart Before Install

# Verify chart from repository
helm pull myrepo/mychart --verify --keyring /path/to/keyring.gpg

# Check chart provenance file
cat mychart-0.1.0.tgz.prov

Template Security Scanning

This section covers template security scanning for securing helm chart deployments.

Ensure all prerequisites are met before proceeding
Follow the documented workflow steps in sequence
Record results and any anomalies encountered during this phase

Render and Scan Templates

# Render templates without deploying
helm template myrelease ./mychart --values values-prod.yaml > rendered.yaml

# Scan with kubesec
kubesec scan rendered.yaml

# Scan with checkov
checkov -f rendered.yaml --framework kubernetes

# Scan with trivy
trivy config rendered.yaml

# Scan with kube-linter
kube-linter lint rendered.yaml

# Lint chart
helm lint ./mychart --values values-prod.yaml --strict

# Lint with debug output
helm lint ./mychart --debug

# values.yaml - Security hardened defaults
securityContext:
  runAsNonRoot: true
  runAsUser: 1000
  runAsGroup: 3000
  fsGroup: 2000
  readOnlyRootFilesystem: true
  allowPrivilegeEscalation: false
  capabilities:
    drop:
      - ALL

podSecurityContext:
  seccompProfile:
    type: RuntimeDefault

resources:
  limits:
    cpu: 500m
    memory: 512Mi
  requests:
    cpu: 100m
    memory: 128Mi

networkPolicy:
  enabled: true

serviceAccount:
  create: true
  automountServiceAccountToken: false

image:
  pullPolicy: Always
  # Use digest instead of tag for immutability
  # tag: "1.0.0"
  # digest: "sha256:abc123..."

# templates/deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: {{ include "mychart.fullname" . }}
spec:
  template:
    spec:
      automountServiceAccountToken: {{ .Values.serviceAccount.automountServiceAccountToken }}
      securityContext:
        {{- toYaml .Values.podSecurityContext | nindent 8 }}
      containers:
        - name: {{ .Chart.Name }}
          securityContext:
            {{- toYaml .Values.securityContext | nindent 12 }}
          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
          resources:
            {{- toYaml .Values.resources | nindent 12 }}

# templates/external-secret.yaml
apiVersion: external-secrets.io/v1beta1
kind: ExternalSecret
metadata:
  name: {{ include "mychart.fullname" . }}-secrets
spec:
  refreshInterval: 1h
  secretStoreRef:
    name: aws-secretsmanager
    kind: ClusterSecretStore
  target:
    name: {{ include "mychart.fullname" . }}-secrets
  data:
    - secretKey: db-password
      remoteRef:
        key: production/database
        property: password

# Install helm-secrets plugin
helm plugin install https://github.com/jkroepke/helm-secrets

# Encrypt values file
helm secrets encrypt values-secrets.yaml

# Deploy with encrypted secrets
helm secrets install myrelease ./mychart -f values.yaml -f values-secrets.yaml

# Decrypt for editing
helm secrets edit values-secrets.yaml

# helm-deployer-role.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: helm-deployer
  namespace: production
rules:
  - apiGroups: ["", "apps", "batch", "networking.k8s.io"]
    resources: ["deployments", "services", "configmaps", "secrets", "ingresses", "jobs"]
    verbs: ["get", "list", "create", "update", "patch", "delete"]
  - apiGroups: [""]
    resources: ["pods", "pods/log"]
    verbs: ["get", "list"]

---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: helm-deployer-binding
  namespace: production
subjects:
  - kind: ServiceAccount
    name: helm-deployer
    namespace: production
roleRef:
  kind: Role
  name: helm-deployer
  apiGroup: rbac.authorization.k8s.io

# .github/workflows/helm-security.yaml
name: Helm Chart Security
on:
  pull_request:
    paths: ['charts/**']

jobs:
  lint-and-scan:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Helm lint
        run: helm lint ./charts/mychart --strict

      - name: Render templates
        run: helm template test ./charts/mychart -f charts/mychart/values.yaml > rendered.yaml

      - name: Scan with kube-linter
        uses: stackrox/kube-linter-action@v1
        with:
          directory: rendered.yaml

      - name: Scan with trivy
        uses: aquasecurity/trivy-action@master
        with:
          scan-type: config
          scan-ref: rendered.yaml

      - name: Scan with checkov
        uses: bridgecrewio/checkov-action@master
        with:
          file: rendered.yaml
          framework: kubernetes

Rationalization	Reality
"We are too small to be targeted"	Automated attacks target everyone. Size does not matter.
"Security slows us down"	A breach slows you down 100x more. Build security in from the start.
"We will fix it after launch"	Vulnerabilities in production are exploited within hours. Fix before deploy.