dash/contrib/verify-commits
fanquake ffe950bbc7
partial merge #16327: scripts and tools: Update ShellCheck linter
1ac454a3844b9b8389de0f660fa9455c0efa7140 Enable ShellCheck rules (Hennadii Stepanov)

Pull request description:

  Enable some simple ShellCheck rules.

  Note for reviewers: `bash` and `shellcheck` on macOS are different from ones on Ubuntu.
  For local tests the latest `shellcheck` version 0.6.0 should be used (see #15166).

ACKs for top commit:
  practicalswift:
    utACK 1ac454a3844b9b8389de0f660fa9455c0efa7140
  dongcarl:
    utACK 1ac454a
  fanquake:
    ACK 1ac454a3844b9b8389de0f660fa9455c0efa7140

Tree-SHA512: 8d0a3a5c09fe1a0c22120178f5e6b80f81f746f8c3356b7701ff301c117acb2edea8fe08f08fb54ed73f94b1617515fb239fa28e7ab4121f74872e6494b6f20e
2021-12-03 18:13:01 +03:00
..
allow-incorrect-sha512-commits Merge #13066: Migrate verify-commits script to python, run in travis 2021-05-06 12:06:09 +03:00
allow-revsig-commits
allow-unclean-merge-commits Merge #13066: Migrate verify-commits script to python, run in travis 2021-05-06 12:06:09 +03:00
gpg.sh partial merge #16327: scripts and tools: Update ShellCheck linter 2021-12-03 18:13:01 +03:00
pre-push-hook.sh Merge #13066: Migrate verify-commits script to python, run in travis 2021-05-06 12:06:09 +03:00
README.md Merge #17637: script: Add Keyserver to verify-commits README 2021-09-14 14:30:21 -04:00
trusted-git-root
trusted-keys Merge #21615: script: Add trusted key for hebasto 2021-07-16 10:04:09 -05:00
trusted-sha512-root-commit
verify-commits.py Merge #15255: [tests] Remove travis_wait from lint script 2021-09-10 20:55:59 -04:00

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 Python 3 script to verify commits against a trusted keys list.

Using verify-commits.py safely

Remember that you can't use an untrusted script to verify itself. This means that checking out code, then running verify-commits.py against HEAD is not safe, because the version of verify-commits.py 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.py 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.

Import trusted keys

In order to check the commit signatures, you must add the trusted PGP keys to your machine. GnuPG may be used to import the trusted keys by running the following command:

gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys $(<contrib/verify-commits/trusted-keys)

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.py 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.