t4943: apply Gemini review wording to secret temp-file guidance#4952
t4943: apply Gemini review wording to secret temp-file guidance#4952marcusquinn wants to merge 2 commits intomainfrom
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Summary of ChangesHello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request refines the guidance for handling secrets that must be passed through temporary files. It incorporates feedback to enhance the clarity and security instructions, specifically detailing how to create temporary files securely and ensure their robust cleanup. Highlights
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Code Review
This pull request updates the guidance for handling secrets in temporary files. The change improves the previous advice by suggesting mktemp and trap for cleanup. However, the proposed mktemp and chmod sequence has a minor race condition vulnerability. My review includes a suggestion to use umask to create the temporary file with secure permissions from the start, which is a more robust approach.
| - SAFE: `SSH_AUTH_SOCK=... ssh ...` — env-based auth, no secret in argv | ||
| - The subprocess must read the value from its environment (`getenv()` in C/PHP, `process.env` in Node, `os.environ` in Python, `ENV[]` in Ruby), not from `$1`/`argv`. | ||
| - When the target program only accepts secrets as arguments (no env var support), write the secret to a temporary file (mode 0600), pass the file path as the argument, and delete the file immediately after. This is a last resort — prefer programs that support env var or stdin input. | ||
| - When the target program only accepts secrets as arguments (no env var support), write the secret to a temporary file (e.g., using `mktemp` to create it and `chmod 0600` to set permissions), pass the file path as the argument, and ensure robust cleanup on script exit (e.g., using a `trap` command on the `EXIT` signal). This is a last resort — prefer programs that support env var or stdin input. |
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The guidance to use mktemp and chmod is a good step towards security, but it introduces a brief time window between file creation and permission modification. During this window, the file exists with default permissions, creating a potential race condition. A more secure pattern is to set the umask to 077 before calling mktemp. This ensures the file is created with 0600 permissions atomically, eliminating the race condition. Using a subshell like (umask 077 && mktemp) can scope the umask change to just that command.
- When the target program only accepts secrets as arguments (no env var support), write the secret to a temporary file ensuring `0600` permissions at creation (e.g., by setting `umask 077` before calling `mktemp`), pass the file path as the argument, and ensure robust cleanup on script exit (e.g., using a `trap` command on the `EXIT` signal). This is a last resort — prefer programs that support env var or stdin input.
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Closing as superseded. PR #4951 already merged the mktemp/trap guidance to build.txt. The core improvement (mktemp + trap for cleanup) is now in main. The additional wording refinements (explicit chmod 0600, EXIT signal) are minor and can be addressed in a follow-up if needed. |
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Summary
.agents/prompts/build.txtfor the secret-as-argument fallback guidance.chmod 0600aftermktempcreation.trapon theEXITsignal for robust script-exit cleanup.Context
Closes #4943