Tooling for verification of PGP signed commits ---------------------------------------------- This is an incomplete work in progress, but currently includes a pre-push hook script (`pre-push-hook.sh`) for maintainers to ensure that their own commits are PGP signed (nearly always merge commits), as well as a script to verify commits against a trusted keys list. Using verify-commits.sh safely ------------------------------ Remember that you can't use an untrusted script to verify itself. This means that checking out code, then running `verify-commits.sh` against `HEAD` is _not_ safe, because the version of `verify-commits.sh` that you just ran could be backdoored. Instead, you need to use a trusted version of verify-commits prior to checkout to make sure you're checking out only code signed by trusted keys: git fetch origin && \ ./contrib/verify-commits/verify-commits.sh origin/master && \ git checkout origin/master Note that the above isn't a good UI/UX yet, and needs significant improvements to make it more convenient and reduce the chance of errors; pull-reqs improving this process would be much appreciated. Configuration files ------------------- * `trusted-git-root`: This file should contain a single git commit hash which is the first unsigned git commit (hence it is the "root of trust"). * `trusted-sha512-root-commit`: This file should contain a single git commit hash which is the first commit without a SHA512 root commitment. * `trusted-keys`: This file should contain a \n-delimited list of all PGP fingerprints of authorized commit signers (primary, not subkeys). * `allow-revsig-commits`: This file should contain a \n-delimited list of git commit hashes. See next section for more info. Key expiry/revocation --------------------- When a key (or subkey) which has signed old commits expires or is revoked, verify-commits will start failing to verify all commits which were signed by said key. In order to avoid bumping the root-of-trust `trusted-git-root` file, individual commits which were signed by such a key can be added to the `allow-revsig-commits` file. That way, the PGP signatures are still verified but no new commits can be signed by any expired/revoked key. To easily build a list of commits which need to be added, verify-commits.sh can be edited to test each commit with BITCOIN_VERIFY_COMMITS_ALLOW_REVSIG set to both 1 and 0, and those which need it set to 1 printed.