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Why scan before creating a commit?
The commit is a practical point to intervene: the developer can still see the change and replace a hardcoded credential with an approved secret-injection method before recording it in Git history. A pre-commit hook runs on the developer’s machine and can reject a commit when its scan detects a likely secret. Gitleaks documents a pre-commit integration and an example of a detected secret causing a commit to fail: Gitleaks documentation.
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This is useful because a credential in repository history can be copied and distributed. OWASP warns that once a secret reaches a Git repository, it must be considered compromised: repositories are cloned and forked, and automated bots scan public commits soon after they are pushed. Deleting the line later does not invalidate the credential or reliably erase every copy. OWASP Secrets Management guidance.
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Use the local scan for fast feedback, then add independent checks at later stages. OWASP recommends this layered approach, including CI, push protection, historical scans, and incident response. OWASP DevSecOps Secrets Management.
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1. Run a pre-commit hook locally
Configure a maintained scanner such as Gitleaks to inspect staged changes or commit content. Pin the hook revision in repository configuration and update it periodically rather than relying on a version copied from an old setup guide. Keep rules and exclusions under review: a broad allowlist may suppress real findings. Gitleaks documents how to install its pre-commit hook in its project README.
Make findings actionable without exposing the credential again. Report the file and location, identify the matching rule, and avoid printing the full secret in terminal output or logs. Provide a process for reporting false positives, and record and review hook bypasses.
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2. Repeat the check in CI
A developer can skip a local hook, intentionally or accidentally. Run an independent scan in continuous integration, including on pull-request changes, so a skipped local check does not become the only line of defense. CI can also scan repository history periodically, which may reveal credentials committed before scanning was introduced.
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Push protection can block recognized credentials as a push is sent to a hosting service. It runs later than a local hook, but may stop a detected secret from reaching the hosted repository. GitHub describes the feature as “designed to prevent hardcoded credentials, such as secrets or tokens, from ever being pushed to your repository.” GitHub Docs: About push protection.
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GitHub’s coverage depends on repository type, feature availability, and enablement. Its documentation says secret scanning is automatic for public repositories, while coverage for organization-owned private and internal repositories depends on GitHub Secret Protection. Repository push protection requires the feature and is disabled by default for repositories. Check the current GitHub documentation and plan eligibility for your organization before relying on it.
4. Scan history and prepare for response
Prevention only protects commits checked after the controls are in place. Run historical scans to look for earlier exposures, and make sure findings reach someone who can investigate and act. A clean current working tree does not establish that the repository’s history is clean.
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What each control can and cannot do
| Control | When it runs | What it can inspect | Key limitation |
|---|---|---|---|
| Local pre-commit hook | Before Git creates the local commit | Configured staged changes or commit content | Can be skipped; results depend on scanner patterns and configuration. |
| CI scan | During a build or pull-request check | Changes selected by the CI workflow; history if configured | Does not prevent every local commit and still depends on scan scope and detection rules. |
| Host-side push protection | When a developer pushes to the repository host | Credentials the host recognizes within its supported detection scope | Availability and coverage vary; supported patterns and operational limits mean some pushes may not be blocked. |
| Historical scan | On a schedule or during an investigation | Repository history within the scanner’s configured scope | Finds possible past exposure; it does not invalidate a credential or erase copies already made. |
These controls are complementary, not competing substitutes. A local hook shortens the gap between a mistake and feedback; CI and host controls add independent opportunities to catch it; history scans look further back. None proves that a repository contains no secrets.
Why push protection is not a guarantee
Push protection recognizes supported patterns; it is not a universal detector for every kind of credential. GitHub documents that protection may fail to block a push if scanning times out, skips scans for public-repository pushes larger than 50 MB, and has limitations involving previously alerted secrets and pattern versions. GitHub Docs: Secret scanning detection scope.
More generally, detection depends on the patterns and configuration in use. Custom rules and carefully reviewed exclusions can improve fit for a project, but every exception is a maintenance decision. Treat a passed scan as evidence that the configured checks found nothing—not proof that no secret is present.
What to do when a scan finds a real credential
- Confirm whether it is a real credential. If it is, treat it as exposed; do not rely on deleting the line or making the repository private.
- Rotate or revoke it promptly through the issuing service. This invalidates the exposed credential; rewriting Git history alone does not.
- Review relevant access logs and investigate possible use. Follow your organization’s incident-response process and any applicable privacy procedures.
- Clean up repository history when appropriate. Coordinate with collaborators who may have cloned the repository, since history cleanup cannot remove copies already distributed.
- Address the cause. Replace the hardcoded value with an approved secret-injection method, then review the scanner rule, workflow, and any bypass or exclusion that allowed it through.
OWASP’s guidance and GitHub’s documentation both emphasize prompt credential invalidation alongside investigation and appropriate repository cleanup: OWASP DevSecOps Secrets Management and GitHub Docs: About push protection.
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