t4943: Add mktemp and trap guidance to secret-as-argument fallback#4951
t4943: Add mktemp and trap guidance to secret-as-argument fallback#4951alex-solovyev merged 1 commit 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 improves the security guidelines for handling sensitive information within the system. It provides more explicit instructions on how to safely manage secrets when they must be passed via temporary files, ensuring proper creation and immediate deletion to mitigate potential exposure risks. Highlights
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Code Review
This pull request improves security guidance by recommending mktemp and trap for handling secrets in temporary files. The change is beneficial. I've suggested a minor clarification to the guidance on setting file permissions and using trap to ensure the recommended pattern is portable and accurately described.
| - 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`, 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. |
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This guidance can be made more precise for better security and portability.
- Explicitly mentioning
chmod 0600is more portable than relying onmktemp's mode-setting options, which differ between systems. - Clarifying that
trapensures cleanup on script exit (e.g., with theEXITsignal) is more accurate than 'immediately after', astrap's primary benefit is robustness against unexpected termination.
- 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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Dispatching worker to address review suggestions.
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Opened follow-up PR #4952 on |
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Summary
mktempandtrapguidance to the secret-as-argument fallback pattern inbuild.txt:267, making the temporary file pattern more specific and secure.Changes
Single prose edit to
.agents/prompts/build.txtline 267:mktemp, with mode 0600)... and ensure the file is deleted immediately after (e.g., using atrapcommand for cleanup on exit or error)"Closes #4943