Sieve and bad file extensions?

[bobpullen]

Hi,

Does Rollernet's Sieve implementation offer a sensible method of refusing messages with known bad file extensions e.g. Office macros etc?
If not, is there any other sensible way of refusing messages containing certain types of attachment?

[bobpullen]

For the benefit of anybody else that stumbles across this, I don't believe Pigeonhole has many graceful methods of handling file attachments.

It's probably a bit dirty, but I eventually worked around the problem like this:

Code: Select all

if body :raw :regex  ["filename=.*\.docm","filename=.*\.dotm","filename=.*\.xlm","filename=.*\.xlsm","filename=.*\.xltm","filename=.*\.xla","filename=.*\.pptm","filename=.*\.potm","filename=.*\.ppsm","filename=.*\.sldm"]
{
	reject "Attachment contains a banned file extension.";
}

You'll need to require "reject","body" and "regex" when declaring the extensions for your script.

[bobpullen]

Can't edit the above post, but turns out that in some cases my regex was matching strings it shouldn't have. Fixed by adding word boundaries like this:

Code: Select all

if body :raw :regex  ["\bfilename=.*\.docm\b","\bfilename=.*\.dotm\b","\bfilename=.*\.pptm\b","\bfilename=.*\.potm\b","\bfilename=.*\.ppsm\b","\bfilename=.*\.sldm\b","\bfilename=.*\.xlsm\b","\bfilename=.*\.xltm\b","\bfilename=.\*.xla\b","\bfilename=.\*.xlm\b"]
{
         reject "Attachment contains a banned file extension.";
}

[Seth]

We did recently add a feature for this in the account control center with a predefined list:
https://acc.rollernet.us/mail/options.php