file header analysis vs file extension

[Kevin Spicer]

> You'd haveto have something actually reading parts of every attachment
(like
>a virus scanner) to determine its "real" extension.


> I can imagine some company policies not allowing .mp3 files, and users
> figuring out they can just rename to to .txt getting it through


I imagine it wouldn't be hugely difficult to knock up a custom config
module that used something like the 'file' command to check the (real)
mime type of a file using magic numbers, perhaps using the perl
File::MMagic module?







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