Verify package attestations and enforce provenance policies in pub get/upgrade - #4875
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Adds loadTrustedRoot() and loadTrustedRootJson() in package:pub to resolve the Sigstore root of trust from: 1. Explicit override paths passed to the loader. 2. The PUB_SIGSTORE_TRUST_ROOT environment variable. 3. The built Dart SDK distribution at lib/_internal/sigstore/trusted_root.json. 4. The Dart SDK repository checkout at third_party/sigstore/trusted_root.json.
…t/upgrade - Adds `package:sigstore` dependency from labs monorepo. - Implements `PubAttestationVerifier` wrapping Sigstore attestation verifier. - Fetches and cryptographically verifies Sigstore attestations during hosted downloads in `pub get` and `pub upgrade`. - Enforces lockfile downgrade protection, SLSA provenance, digest match, and certificate roots. - Adds comprehensive unit and integration tests.
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Client-side Ingestion & Cryptographic Verification on
pub get/upgradeWhen downloading packages in
HostedSource, queries the repository forGET /api/packages/<pkg>/versions/<ver>/attestationand runsPubAttestationVerifieragainst the cached or embedded Sigstoretrusted_root.json:ProvenancePolicy.enforcePolicy()blocks downgrades from signed to unsigned packages and detects repository switches across versions..tar.gzSHA-256 hash matches the in-toto subject digest in the attestation.<package>-<version>.tar.gz.trusted_root.jsonFulcio Root CAs.trusted_root.json.https://token.actions.githubusercontent.comissuer identity.pubspec.yaml's declared repository.Tests
test/get/hosted/attestation_verification_test.darttest/sigstore/verifier_test.darttest/sigstore/trusted_root_test.darttest/sigstore/lockfile_policy_test.dart