Validate repository directory ownership #6266
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Provide individual file ownership checks for both the current user and the system user, as well as a combined current user and system user check.
Ensure that the repository directory is owned by the current user; this prevents us from opening configuration files that may have been created by an attacker.
Provide a mock for file ownership for testability.
Test that we prevent opening directories that are not owned by ourselves.
Pull the global configuration loader out of the symlink check so that it can be re-used.
Obey the `safe.directory` configuration variable if it is set in the global or system configuration. (Do not try to load this from the repository configuration - to avoid malicious repositories that then mark themselves as safe.)
Introduce the `GIT_OPT_SET_OWNER_VALIDATION` option, so that users can disable repository ownership validation.
This was referenced Apr 12, 2022
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Validate that the repository (the
.gitfolder for bare repositories, or its parent, the working directory, for non-bare repositories) is owned by the current user. This prevents a class of attacks where an attacker creates a.gitdirectory in a shared folder (eg/tmp) with a malicious configuration. Other users on the system who run git commands in/tmpwould then be vulnerable.