GitHub Workflows security hardening #9440
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TimWolla
approved these changes
Aug 27, 2022
TimWolla
approved these changes
Aug 27, 2022
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Perfect, thanks. This likely should be merged by an organization owner, so that the default permissions for new workflows can also be restricted in the repository settings at: https://github.com/php/php-src/settings/actions (bottom most setting).
mvorisek
reviewed
Aug 28, 2022
Co-authored-by: Michael Voříšek <mvorisek@mvorisek.cz>
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This PR adds explicit permissions section to workflows. This is a security best practice because by default workflows run with extended set of permissions (except from
on: pull_requestfrom external forks). By specifying any permission explicitly all others are set to none. By using the principle of least privilege the damage a compromised workflow can do (because of an injection or compromised third party tool or action) is restricted.It is recommended to have most strict permissions on the top level and grant write permissions on job level case by case.