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fix(ci): do not persist the job token in .git/config in the public-repo guard - #42

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fix/1870-persist-credentials-false
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fix(ci): do not persist the job token in .git/config in the public-repo guard#42
yakimoto wants to merge 1 commit into
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fix/1870-persist-credentials-false

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@yakimoto

@yakimoto yakimoto commented Aug 6, 2026

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Why

actions/checkout without persist-credentials: false writes the job's GITHUB_TOKEN into
.git/config, where any later step — or anything those steps execute — can read it. This is the
security gate that DOWNLOADS AND EXECUTES the gitleaks binary, and the workflow's own comment
already reasons about tampered downloads ("so a tampered or MITM'd download can never execute
inside the security gate"), so the threat model is written down and only the credential half of
the mitigation is missing. Found by zizmor as warning[artipacked]: credential persistence through GitHub Actions artifacts.

Safety

Verified this job only: checks out, installs gitleaks (pinned + checksum), runs
gitleaks detect --no-git, installs ripgrep, runs content-policy.sh. permissions: contents: read. Nothing pushes, calls gh, or reads GITHUB_TOKEN/GH_TOKEN, so the token was never needed
in .git/config in the first place.

Refs wave-av/claude-workstation#1870.


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Review in cubic

…po guard

actions/checkout without persist-credentials:false leaves GITHUB_TOKEN readable
in .git/config for every later step — including the one that downloads and
executes the gitleaks binary. Nothing in this job uses the credential
(contents:read, gitleaks runs --no-git, no gh/push steps). Refs #1870.
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cursor Bot commented Aug 6, 2026

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

Open in Devin Review

@macroscopeapp

macroscopeapp Bot commented Aug 6, 2026

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Approvability

Verdict: Approved dd2a0b7

This is a minor CI security hardening change that adds persist-credentials: false to the checkout action, preventing the job token from being stored in .git/config. The change follows security best practices and doesn't alter deployment targets or production behavior. The author owns this workflow file.

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PR Summary by Qodo

Harden public-repo guard checkout by disabling credential persistence

🐞 Bug fix ⚙️ Configuration changes 🕐 Less than 5 minutes

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AI Description

• Prevent actions/checkout from writing GITHUB_TOKEN into .git/config.
• Reduce token exposure in a job that downloads and executes external binaries.
Diagram

graph TD
  A["GitHub Actions job"] --> B["actions/checkout"] --> C["Workspace .git/config"] --> D{"Token persisted?"}
  D -->|"before"| E["GITHUB_TOKEN readable"]
  D -->|"after: persist-credentials:false"| F["No token stored"]
  A --> G["Later steps (gitleaks/install)"]
  G -. "cannot read token from .git/config" .-> F
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High-Level Assessment

Disabling credential persistence on checkout is the correct mitigation here: the job doesn’t need git auth after checkout, and it reduces the blast radius for any compromised/tampered tool executed later in the workflow. Alternatives (e.g., relying solely on permissions: contents: read or adding token-scrubbing steps) are weaker or more error-prone than preventing the token from being written in the first place.

Files changed (1) +2 / -0

Bug fix (1) +2 / -0
public-repo-guard.ymlDisable 'actions/checkout' credential persistence for the guard job +2/-0

Disable 'actions/checkout' credential persistence for the guard job

• Adds 'persist-credentials: false' to the checkout step so the workflow does not write the job token into '.git/config'. This reduces the chance that later steps (including downloaded/executed tools) can read and misuse 'GITHUB_TOKEN'.

.github/workflows/public-repo-guard.yml

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Reviewing files that changed from the base of the PR and between 6649096 and dd2a0b7.

📒 Files selected for processing (1)
  • .github/workflows/public-repo-guard.yml

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Code Review by Qodo

🐞 Bugs (0) 📘 Rule violations (0) 📎 Requirement gaps (0)

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Great, no issues found!

Qodo reviewed your code and found no material issues that require review

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No issues found across 1 file

Confidence score: 5/5

  • Automated review surfaced no issues in the provided summaries.
  • No files require special attention.

Re-trigger cubic

@yakimoto

yakimoto commented Aug 6, 2026

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This PR is redundant with #39 (chore/guard-canonical-sync), which is already open and already contains this exact change.

Evidence — #39's diff to .github/workflows/public-repo-guard.yml includes:

+          # tree. Nothing here pushes -- the scan is `--no-git` over the working tree --
+          # so no step needs authenticated Git; drop it. (zizmor: artipacked)
+          persist-credentials: false

#39 is also broader than this PR: it syncs the whole vendored public-repo-guard trio to
the canonical source (wave-foundation/scaffolder/public-repo-guard) byte-for-byte, verified by
git blob SHA, rather than adding this one line in isolation.

Closing as redundant. This duplicate exists because the fan-out that opened this PR
(refs claude-workstation#1870) did not check for in-flight PRs touching the same file before
going out — #39 was already open. Merge #39 instead.

@yakimoto yakimoto closed this Aug 6, 2026
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