t4962: clarify temp-file secret handling guidance#4969
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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 in temporary files within the Highlights
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Code Review
This pull request improves the guidance on handling secrets in temporary files within the .agents/prompts/build.txt file. The clarification to use mktemp followed by chmod, and to use trap on EXIT for cleanup, is a positive step. I have provided one suggestion to further enhance the security of temporary file creation by using a subshell with a restrictive umask, which is a more robust pattern that avoids a potential race condition.
| - 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 (e.g., using `mktemp`, with mode 0600), pass the file path as the argument, and ensure the file is deleted immediately after (e.g., using a `trap` command for cleanup on exit or error). 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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While clarifying the use of mktemp and chmod is an improvement, there is a more secure and portable pattern. A race condition can exist between the file creation by mktemp and the permission change by chmod. In that small window, the file could be accessible with default permissions if the umask is permissive.
A more robust approach is to set a restrictive umask before creating the file, which can be done atomically within a subshell. This avoids the race condition.
- When the target program only accepts secrets as arguments (no env var support), write the secret to a temporary file (e.g., by using a subshell with a restrictive umask like `(umask 077 && 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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Summary
.agents/prompts/build.txtto match the remaining Gemini medium-severity review feedback from PR t4943: Add mktemp and trap guidance to secret-as-argument fallback #4951.mktempcreation pluschmod 0600permission hardening.traponEXITfor robust script-exit cleanup semantics.Closes #4962
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