Do not complain if C:\ProgramData\Git\config is owned by a specific administrator
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Let's refactor the `validate_system_file_ownership()` a bit, not only to clarify what is done, but also to prepare for maybe adding a slighty more expensive check: it is possible that the file `C:\ProgramData\Git\config` is owned by the local administrator (who has a different SID than the `Administrators` group). Signed-off-by: Johannes Schindelin <[email protected]>
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We recently hardened Git for Windows by ignoring `C:\ProgramData\Git\config` files unless they are owned by the system account, by the administrators group, or by the account under which Git is running. Turns out that there are situations when that config file is owned by _an_ administrator, not by the entire administrators group, and that still is okay. This can happen very easily e.g. in Docker Containers. Let's add a fall back when the owner is none of the three currently expected ones, enumerating the members of the administrators group and comparing them to the file's owner. If a match is found, the owner is not dubious. Enumerating groups' members on Windows is not exactly a cheap operation, and it requires linking to the `netapi32.dll`. Since this is rarely needed, and since this is done at most a handful of times during any Git process' life cycle, it is okay that it is a bit expensive. To avoid the startup cost of linking to yet another DLL, we do this lazily instead: that way, the vast majority of Git for Windows' users will not feel any impact by this patch. This fixes git-for-windows#2304. Signed-off-by: Johannes Schindelin <[email protected]>
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Recently, we hardened the ProgramData support by ignoring the config file when it is owned by a "dubious" user, i.e. by an account other than the local administrators group, the system account or the current user.
Turns out, there is at least one scenario where that config file can be legitimately owned by a specific administrator rather than the administrators group, and that still should not be treated as "dubious". Let's implement code to handle this situation gracefully.
This fixes #2304.