policy: add builtin default source policy#3807
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tonistiigi wants to merge 2 commits intodocker:masterfrom
Open
policy: add builtin default source policy#3807tonistiigi wants to merge 2 commits intodocker:masterfrom
tonistiigi wants to merge 2 commits intodocker:masterfrom
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Embed an opt-in default source policy for Docker-managed frontend images. Load it ahead of user policies when enabled, and cover behavior with table- driven policy tests for signed, unsigned, floating, and labs tags. Makes sure if there is any attack against the docker/dockerfile releases, or they accidentally point to worng images, these are automatically detected. In a future release these should become opt-out. Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
Extends the builtin default policy to verify docker-github-builder signatures on docker/buildkit-syft-scanner images. Tags `latest` and 1.10+ require a signature from the docker/buildkit-syft-scanner source repository; older tags pass through unchanged. Factors the shared ref matching logic into sig_ref_matches for dockerfile and introduces a syft-scanner variant that uses the plain refs/tags/ prefix. Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
crazy-max
approved these changes
Apr 21, 2026
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Embed an opt-in default source policy for Docker-managed frontend images. Gated by
BUILDX_DEFAULT_POLICYenv.docker/dockerfiledocker/dockerfile-upstreamdocker/buildkit-syft-scannerLoad it ahead of user policies when enabled, and cover behavior with table-
driven policy tests for signed, unsigned, floating, and labs tags.
Makes sure if there is any attack against the docker/dockerfile or syft scanner releases
releases, or they accidentally point to worng images, these are automatically detected.
In a future release these should become opt-out.
related moby/buildkit#658