LaunchDarkly uses the SLSA framework (Supply-chain Levels for Software Artifacts) to help developers make their supply chain more secure by ensuring the authenticity and build integrity of our published SDK packages.
As part of SLSA requirements for level 3 compliance, LaunchDarkly publishes provenance about our SDK package builds using GitHub's generic SLSA3 provenance generator for distribution alongside our packages. These attestations are available for download from the GitHub release page for the release version under Assets > multiple-provenance.intoto.jsonl.
To verify SLSA provenance attestations, we recommend using slsa-verifier. Example usage for verifying SDK packages is included below:
# Set the version of the SDK to verify
SDK_VERSION=8.8.1
# Download gem
$ gem fetch launchdarkly-server-sdk -v $SDK_VERSION
# Download provenance from Github release
$ curl --location -O \
https://github.com/launchdarkly/ruby-server-sdk/releases/download/${SDK_VERSION}/launchdarkly-server-sdk-${SDK_VERSION}.gem.intoto.jsonl
# Run slsa-verifier to verify provenance against package artifacts
$ slsa-verifier verify-artifact \
--provenance-path launchdarkly-server-sdk-${SDK_VERSION}.gem.intoto.jsonl \
--source-uri github.com/launchdarkly/ruby-server-sdk \
launchdarkly-server-sdk-${SDK_VERSION}.gem
Below is a sample of expected output.
Verified signature against tlog entry index 78214752 at URL: https://rekor.sigstore.dev/api/v1/log/entries/24296fb24b8ad77ab941c118ef7e0b2d656b962a0d670c6ac91cfa37d07b7b121ae560b00a978ecf
Verified build using builder "https://github.com/slsa-framework/slsa-github-generator/.github/workflows/generator_generic_slsa3.yml@refs/tags/v1.7.0" at commit f43b3ad834103fdc282652efbfe4963e8dfa737b
Verifying artifact launchdarkly-server-sdk-8.3.0.gem: PASSED
PASSED: Verified SLSA provenance
Alternatively, to verify the provenance manually, the SLSA framework specifies recommendations for verifying build artifacts in their documentation.
Note: These instructions do not apply when building our SDKs from source.