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committer-verification.md

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Committer Verification

Gitsign can be optionally configured to verify that the committer user identity matches the git user configuration (i.e. user.name and user.email)

To enable committer verification, run git config gitsign.matchCommitter true.

Committer verification is done by matching the certificate Subject Alternative Name (SAN) against the issued Fulcio certificate in the following order:

  1. An EmailAddresses cert value matches the committer user.email. This should be used for most human committer verification.
  2. A URI cert value matches the committer user.name. This should be used for most automated user committer verification.

In the event that multiple SAN values are provided, verification will succeed if at least one value matches.

Configuring Automated Users

If running in an environment where the authenticated user does not have a user email to bind against (i.e. GitHub Actions, other workload identity workflows), users are expected to be identified by the SAN URI instead.

See https://github.com/sigstore/fulcio/blob/main/docs/oidc.md for more details

GitHub Actions

# This configures the SAN URI for the expected identity in the Fulcio cert.
$ git config user.name "https://myorg/myrepo/path/to/workflow"
# This configures GitHub UI to recognize the commit as coming from a GitHub Action.
$ git config user.email 1234567890+github-actions@users.noreply.github.com