ci: flip harden-runner to egress block mode with per-job allowlists (SLSA phase 5) - #41
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…SLSA phase 5) Every job moves from egress-policy: audit to block with an explicit allowed-endpoints list: the job's observed egress baseline (StepSecurity insights across the runs since phase 4 landed) plus GitHub/Go-infra cache-miss paths the same tools use. The release job has not yet run under harden-runner; its list adds the publish endpoints (release upload, Sigstore keyless signing) to the shared build baseline, and its attest step runs before gh release create, so a blocked endpoint fails the run before anything is published. This PR's own CI validates the block lists live for every pull_request-triggered job. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
serval-frenchie
marked this pull request as ready for review
July 5, 2026 07:48
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I will adjust these to block in the future, just want to make sure that we've captured all the endpoints over a couple of releases |
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What
Phase 5, mirroring threatcl's block-mode flip: every job's harden-runner moves from
egress-policy: audit(added in #35) toblockwith an explicit per-joballowed-endpointslist. Off-list outbound connections now fail at connect time, so a compromised action or dependency can't exfiltrate.Where the lists come from
uploads.github.com,fulcio/rekor/tuf-repo-cdn.sigstore.devfor the provenance attestation, syft'sget.anchore.io/toolbox-data.anchore.io). Note the attest step runs beforegh release createhere, so a blocked endpoint fails the run before anything is published — the safe ordering.Validation
Companion PR on the CLI repo: threatcl/threatcl (same branch name).
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