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.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=4.2.0
# Download package from Hackage
$ curl -O https://hackage.haskell.org/package/launchdarkly-server-sdk-${SDK_VERSION}/launchdarkly-server-sdk-${SDK_VERSION}.tar.gz
# Download provenance from Github release into same directory
$ curl --location -O \
https://github.com/launchdarkly/haskell-server-sdk/releases/download/${SDK_VERSION}/launchdarkly-server-sdk-${SDK_VERSION}.tar.gz.intoto.jsonl
# Run slsa-verifier to verify provenance against package artifacts
$ slsa-verifier verify-artifact \
--provenance-path launchdarkly-server-sdk-${SDK_VERSION}.tar.gz.intoto.jsonl \
--source-uri github.com/launchdarkly/haskell-server-sdk \
launchdarkly-server-sdk-${SDK_VERSION}.tar.gz
Below is a sample of expected output.
Verified signature against tlog entry index 76419919 at URL: https://rekor.sigstore.dev/api/v1/log/entries/24296fb24b8ad77a56491ff79d66537ddc16157d7ba7f31d59f0929cc6ce75ed98a0efed7fd3272a
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 dcf5e4be8e0c176c875919dcd5877193fac4f634
Verifying artifact launchdarkly-server-sdk-4.0.4.tar.gz: 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.