Good morning,
we have a problem with amavisd because mail including
pyhton files (in attachment or into the message body) are banned.
The system sends an alert to the recipient like this:
From: "Content-filter at postinat1.bo.infn.it" <[email protected]>
> Subject: BANNED contents (.exe,gfal_metadata.py) in mail TO YOU from
<.....................>
> Date: 21 Aug 2015 15:42:51 GMT+2
> To: < .......... >
>
> BANNED CONTENTS ALERT
>
> Our content checker found
> banned name: .exe,gfal_metadata.py
>
> in an email to you from:
> ..............
>
> Content type: Banned
We use amavisd-new-2.10.1-4.el7.noarch
The rules fixed in amavisd.conf are the following:
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### BLOCKED ANYWHERE
# qr'^UNDECIPHERABLE$', # is or contains any undecipherable components
qr'^\.(exe-ms|dll)$', # banned file(1) types,
rudimentary
qr'^\.(exe|lha|cab|dll)$', # banned file(1) types
### BLOCK THE FOLLOWING, EXCEPT WITHIN UNIX ARCHIVES:
# [ qr'^\.(gz|bz2)$' => 0 ], # allow any in gzip or bzip2
[ qr'^\.(rpm|cpio|tar)$' => 0 ], # allow any in Unix-type archives
qr'.\.(pif|scr)$'i, # banned extensions - rudimentary
# qr'^\.zip$', # block zip type
### BLOCK THE FOLLOWING, EXCEPT WITHIN ARCHIVES:
[ qr'^\.(zip|rar|arc|arj|zoo)$'=> 0 ], # allow any within these archives
# qr'^application/x-msdownload$'i, # block these MIME types
qr'^application/x-msdos-program$'i,
qr'^application/hta$'i,
# qr'^message/partial$'i, # rfc2046 MIME type
# qr'^message/external-body$'i, # rfc2046 MIME type
# qr'^(application/x-msmetafile|image/x-wmf)$'i, # Windows Metafile
MIME type
# qr'^\.wmf$', # Windows Metafile file(1) type
# block certain double extensions in filenames
qr'^(?!cid:).*\.[^./]*[A-Za-z][^./]*\.\s*(exe|vbs|pif|scr|bat|cmd|com|cpl|dll)[.\s]*$'i,
# qr'\{[0-9a-f]{8}(-[0-9a-f]{4}){3}-[0-9a-f]{12}\}?'i, # Class ID CLSID,
strict
# qr'\{[0-9a-z]{4,}(-[0-9a-z]{4,}){0,7}\}?'i, # Class ID extension
CLSID, loose
qr'.\.(exe|vbs|pif|scr|cpl)$'i, # banned extension - basic
# qr'.\.(exe|vbs|pif|scr|cpl|bat|cmd|com)$'i, # banned extension - basic+cmd
# qr'.\.(ade|adp|app|bas|bat|chm|cmd|com|cpl|crt|emf|exe|fxp|grp|hlp|hta|
# inf|ini|ins|isp|js|jse|lib|lnk|mda|mdb|mde|mdt|mdw|mdz|msc|msi|
# msp|mst|ocx|ops|pcd|pif|prg|reg|scr|sct|shb|shs|sys|vb|vbe|vbs|vxd|
# wmf|wsc|wsf|wsh)$'ix, # banned extensions - long
# qr'.\.(asd|asf|asx|url|vcs|wmd|wmz)$'i, # consider also
# qr'.\.(ani|cur|ico)$'i, # banned cursors and icons
filename
# qr'^\.ani$', # banned animated cursor
file(1) type
# qr'.\.(mim|b64|bhx|hqx|xxe|uu|uue)$'i, # banned extension - WinZip
vulnerab.
);
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Is it possible whitelist python scripts?
Can you help me?
Thanks a lot in advance.
Best regards
Daniela Bortolotti
