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From Daniel Shahaf <...@daniel.shahaf.name>
Subject Re: Proposal: new fsfs.conf properties
Date Wed, 12 Jul 2017 13:37:07 GMT
Branko Čibej wrote on Wed, 12 Jul 2017 12:09 +0200:
> I wasn't really proposing to use libmagic on the server. My point is
> that instead of using file name suffixes (which the compression and
> deltification code don't know about), we'd do some sort of inspection
> instead. Detecting ZIP files, or gzip/bzip2/xz-compressed files, etc.,
> is fairly easy just from looking at a few bytes of headers. Same goes
> for most image and video formats.

That's an option, but it would mean re-solving the problem libmagic
solves.  Is there a way for us to use libmagic securely?

E.g., we could give to libmagic only the first 10 or 20 bytes of the
file (which is enough for it to recognise mpeg/jpeg/xz files, in my
testing), or we could ask libmagic to provide an API that only runs
'safe' magic file tests (e.g., strcmp/memcmp-based tests only)…

Cheers,

daniel

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