[AMaViS-user] Clamav amavisd-new and optional depackers

For 'all' of the depackers, if we are using Clamav and clamav can do ALL
the unpacking for us, would it be a memory saving device to undef ALL of
the unpackers in @decoders?

Are there any here that are needed by amavisd-new given that clamav
should be able unpack everything?
(or is clamv missing some things)

Would an EXTERNAL decoder be 'best for memory, worst for speed'?
Assuming an external decoder isn't called unless it needed, but would
require directory lookup, disk access (and then memory used anyway)

I also note 'doc' decoder repole is disabled.. Not needed? Unsafe?
Does this mean that amavisd-new won't 'decode' word doc 'spam' and pass
it to SA?


@decoders = (
['mail', \&do_mime_decode],
['asc', \&do_ascii],
['uue', \&do_ascii],
['hqx', \&do_ascii],
['ync', \&do_ascii],
['F', \&do_uncompress, ['unfreeze','freeze -d','melt','fcat'] ],
['Z', \&do_uncompress, ['uncompress','gzip -d','zcat'] ],
['gz', \&do_uncompress, 'gzip -d'],
['gz', \&do_gunzip],
['bz2', \&do_uncompress, 'bzip2 -d'],
['lzo', \&do_uncompress, 'lzop -d'],
['rpm', \&do_uncompress, ['rpm2cpio.pl','rpm2cpio'] ],
['cpio', \&do_pax_cpio, ['pax','gcpio','cpio'] ],
['tar', \&do_pax_cpio, ['pax','gcpio','cpio'] ],
['tar', \&do_tar],
['deb', \&do_ar, 'ar'],
# ['a', \&do_ar, 'ar'], # unpacking .a seems an overkill
['zip', \&do_unzip],
['rar', \&do_unrar, ['rar','unrar'] ],
['arj', \&do_unarj, ['arj','unarj'] ],
['arc', \&do_arc, ['nomarch','arc'] ],
['zoo', \&do_zoo, ['zoo','unzoo'] ],
['lha', \&do_lha, 'lha'],
# ['doc', \&do_ole, 'ripole'],
['cab', \&do_cabextract, 'cabextract'],
['tnef', \&do_tnef_ext, 'tnef'],
['tnef', \&do_tnef],
# ['sit', \&do_unstuff, 'unstuff'], # broken/unsafe decoder
['exe', \&do_executable, ['rar','unrar'], 'lha', ['arj','unarj'] ],
);


--
Michael Scheidell, CTO
SECNAP Network Security Corporation
Keep up to date with latest information on IT security: Real time
security alerts:
http://www.secnap.com/news


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