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mount: docs: document the new FileSecurity option in WinFsp 2021 (#5002)

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22
cmd/mountlib/mount.go
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@ -321,10 +321,24 @@ Note that the mapping of permissions is not always trivial, and the result
you see in Windows Explorer may not be exactly like you expected.
For example, when setting a value that includes write access, this will be
mapped to individual permissions "write attributes", "write data" and "append data",
but not "write extended attributes" (WinFsp does not support extended attributes,
see [this](https://github.com/billziss-gh/winfsp/wiki/NTFS-Compatibility)).
Windows will then show this as basic permission "Special" instead of "Write",
because "Write" includes the "write extended attributes" permission.
but not "write extended attributes". Windows will then show this as basic
permission "Special" instead of "Write", because "Write" includes the
"write extended attributes" permission.
If you set POSIX permissions for only allowing access to the owner, using
|--file-perms 0600 --dir-perms 0700|, the user group and the built-in "Everyone"
group will still be given some special permissions, such as "read attributes"
and "read permissions", in Windows. This is done for compatibility reasons,
e.g. to allow users without additional permissions to be able to read basic
metadata about files like in UNIX. One case that may arise is that other programs
(incorrectly) interprets this as the file being accessible by everyone. For example
an SSH client may warn about "unprotected private key file".
WinFsp 2021 (version 1.9, still in beta) introduces a new FUSE option "FileSecurity",
that allows the complete specification of file security descriptors using
[SDDL](https://docs.microsoft.com/en-us/windows/win32/secauthz/security-descriptor-string-format).
With this you can work around issues such as the mentioned "unprotected private key file"
by specifying |-o FileSecurity="D:P(A;;FA;;;OW)"|, for file all access (FA) to the owner (OW).
#### Windows caveats