Security¶

Yohou-Optuna is built on a hardened, security-first release pipeline. This page explains the measures that protect you as a user of the package and what each one means in practice, so you can depend on it with confidence.

How releases reach you safely¶

Trusted publishing (OIDC). Releases are published to PyPI through GitHub's OpenID Connect trusted-publishing flow. No long-lived PyPI API token exists anywhere to be stolen and used to push a malicious release: a release can only originate from this project's own audited release workflow.

Signed artifacts (PEP 740 attestations). Every published distribution carries a cryptographic attestation, produced with Sigstore, binding the artifact to the exact workflow run that built it. You can verify that what you install is what this project actually released, not a tampered copy.

A software bill of materials (SBOM). Each release ships a CycloneDX SBOM enumerating every dependency it resolves. When a vulnerability is disclosed in a transitive dependency, you can tell in seconds whether a given release is affected.

Immutable, monitored dependencies. Third-party GitHub Actions and Python dependencies are pinned, and Renovate keeps them current as reviewable pull requests. A dependency cannot be swapped out from under a release, and updates arrive as visible changes rather than silent drift.

How the code is checked¶

Static security analysis. Every change is scanned with ruff's flake8-bandit (S) ruleset, which flags insecure patterns (unsafe subprocess use, weak hashing, hardcoded credentials, unsafe deserialization) before they can merge.

Deep analysis (CodeQL). GitHub's CodeQL runs data-flow analysis on every change and on a weekly schedule, catching vulnerability classes such as injection and path traversal that line-level linting cannot see.

Secret scanning. gitleaks runs both as a pre-commit hook and as a CI check that cannot be bypassed, so credentials and keys never enter the codebase or a release.

How the pipeline itself is hardened¶

Least privilege. Every automation workflow runs with a read-only token by default; only the specific jobs that must write are granted more. A compromised step cannot quietly rewrite the repository.

A single merge gate. No change lands on the main branch until the full test suite and the security checks above all pass, enforced as one required status check.

Scoped automation identity. Release automation authenticates with a short-lived, narrowly-scoped GitHub App token rather than a broad personal access token, so there is no long-lived automation credential to leak.

Transparency and disclosure¶

An independent security grade. This repository is scored weekly by the OpenSSF Scorecard, an external automated audit of its security practices (pinned dependencies, token permissions, branch protection, and more). The result is public, so the posture is verifiable rather than merely asserted.

Responsible disclosure. If you find a vulnerability, the security policy explains how to report it privately, before any public disclosure.

Reviewed changes. Code ownership is declared in CODEOWNERS, so changes are reviewed before they merge.