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Helm Security
Helm Security
Helm Security
Helm Security
Helm Security
Helm Security
Helm Security
Helm Security
Helm Security
Helm Security Challenges
Helm simplifies Kubernetes deployments but introduces security concerns: untrusted charts, unprotected secrets, and supply chain risks.
Chart Signing
Sign charts with GPG to verify authenticity:
Generate signing key
gpg --full-generate-key
gpg --list-secret-keys
Sign a chart
helm package mychart/
helm sign mychart-1.0.0.tgz --key "developer@example.com"
Verify a chart
helm verify mychart-1.0.0.tgz
With custom public key
gpg --export developer@example.com > pubkey.asc
helm verify mychart-1.0.0.tgz --keyring pubkey.asc
Provenance Files
Provenance files contain the chart hash and signature:
mychart-1.0.0.tgz.prov
apiVersion: v1
files:
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\- mychart-1.0.0.tgz
chart: |
sha256: a1b2c3d4...
signature: |
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\-----BEGIN PGP SIGNATURE-----
iQEzBAABCAAdFiEE...
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\-----END PGP SIGNATURE-----
Automated Verification in CI
CI pipeline chart verification
pipeline:
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\- name: verify-charts
commands:
Import trusted keys
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\- gpg --import trusted-keys.asc
Verify all charts
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\- for chart in charts/*.tgz; do
helm verify "$chart" --keyring trusted-keys.asc || exit 1
done
Scan for vulnerabilities
\\\\\
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