Extra support for some archive types

[korsar182 at gmail.com]

Ralph Seichter <abbot at monksofcool.net> писал(а) в своём письме Sat, 10 Aug  
2019 15:25:36 +0300:

> * korsar:
>
>> I mean 7zip supports 35 archive type, any of them may be used to hide
>> ransomware in the .rar or .zip file and opened by end user. So the
>> mail system is only half protected.
>
> Amavis' default settings are not meant to offer complete protection,
> just a reasonable basis to start from. Adding an unpacker for archive
> type X or banning a type Y can be achieved by changing amavisd.conf
> alone.
>
>> How I can make filetype-to-decoder mappings in amavisd.conf?
>
> Search https://gitlab.com/amavis/amavis/blob/master/amavisd.conf for the
> @decoders array if you need examples. The description used to read:
>
> "A list of pairs or n-tuples: [short-type, code_ref, optional-args...].
> Maps short types to a decoding routine, the first match wins. Arguments
> beyond the first two can be program path string (or a listref of paths
> to be searched) or a reference to a variable containing such a path,
> which allows for lazy evaluation, making possible to assign values to
> legacy configuration variables even after the assignment to @decoders."
>
> -Ralph
Thank you, guys!