Does mono supports this file txs on Linux?

Cheers,
Henry Conceição



On Fri, Feb 19, 2010 at 10:48 AM, Henrik Feldt <[email protected]> wrote:
> Hello,
>
>
>
> I’m finishing the last parts of the security features of the transactional
> system, the access control based on current directory. As I’m writing I’ve
> come to the point where I need to check if the path given is a child node of
> a parent path which I’m constrained to.
>
>
>
> The code looks something like this:
>
>
>
> public bool IsParentOf(PathInfo child)
>
> {
>
>            if (Root == string.Empty || child.Root == string.Empty)
>
>                       throw new NotSupportedException("Non-rooted paths are
> not supported.");
>
>
>
>            var OK = FolderAndFiles == child.FolderAndFiles;
>
>
>
>            switch (Type)
>
>            {
>
>                       case PathType.Device:
>
>                                  OK &= child.DeviceName.ToLowerInvariant()
> == DeviceName.ToLowerInvariant();
>
>                                  break;
>
>                       case PathType.Server:
>
>                                  OK &= child.ServerName.ToLowerInvariant()
> == ServerName.ToLowerInvariant();
>
>                                  break;
>
>                       case PathType.IPv4:
>
>                                  OK &=
> IPAddress.Parse(child.IPv4).Equals(IPAddress.Parse(IPv4));
>
>                                  break;
>
>                       case PathType.IPv6:
>
>                                  OK &=
> (IPAddress.Parse(child.IPv6).Equals(IPAddress.Parse(IPv6)))
>
>                                  break;
>
>                       ...
>
>            }
>
>
>
>            return OK;
>
> }
>
>
>
> As you can see I’m keeping track of a few different combinations. On Mono
> paths are case sensitive, on .Net they aren’t. Not that it’s very common,
> but this done wrong without further checks from the programmer’s part would
> be possible to use for privilege escalation attacks, if the admin has put
> the application in a folder and another in a verbatim folder with different
> casing in the path.
>
>
>
> At some places, like in brail’s view engine the absolute path isn’t used and
> as far as I remember, it’s all lowercase, but it might matter…
>
>
>
> What’s the official line on this from the project’s perspective?
>
>
>
> Cheers,
>
> Henrik
>
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