On 12/03/2015 12:24 PM, Raymond Bakker wrote:
>>> Hello,
>>>
>>> ==Summary==
>>> We are experiencing different DLP behavior for complex RegEx between two
>>> installations.
>>>
>>>
>>> ==System==
>>> Version: ciphermail-virtual-appliance-2.10.0-3.
>>> 1. Ubuntu pre-made virtual appliance (on my laptop)
>>> 2. Red Hat & CentOS gateway package (on a test server)
>>>
>>>
>>> ==Configuration==
>>> DLP: several triggers with "Must Encrypt"
>>> Settings: Encrypt Mode "No Encryption"
>>> Settings: DLP Patterns added
>>>
>>>
>>> ==Example==
>>> We want to search a message for [any text][four numbers][any text]
>>> So we try this RegEx: *.\d{4}.*
>>>
>>> This works perfectly on the Ubuntu VA, but it encrypts EVERY message on
>>> CentOS.
>>> Everything is back to normal when we disable the complex RegEx on CentOS.
>>>
>>> We also tried to search for a little more simple like: [0-9][0-9][0-9][0-9]
>>> Ubuntu version is fine, CentOS version encrypts every message.
>>>
>>>
>>> ==DLP Trigger Comparison ==
>>> Ubuntu version:
>>> - Single words work as expected
>>> - Mail header works as expected
>>> - Complex *.\d{4}.* works as expected
>>>
>>> CentOS version:
>>> - Single words work as expected
>>> - Mail header works as expected
>>> - Complex *.\d{4}.* works DIFFERENT
>>>
>>>
>>> Does anyone have experience with this situation?
>>>
>>> Is our installation perhaps incorrect?
>>
>> It's quite likely that a message contains 4 digits. Could it be that the
>> mail sent via the CentOS gateway is sent with some other mail app than
>> the mail sent via the virtual appliance?
>>
>>>> We will look at this tomorrow, but I'm quite sure it is a default
>>>> intallation as described in the CipherMail guide.
>>
>> The DLP text extractor also extracts header values. So for example a
>> date header will also be extracted. Since almost all mails contain a
>> date header, almost any mail will contain 4 digits.
>>
> That's true. The original is 8 digits (simulate Dutch Personal Id)
> but I get the point. What I don't understand (yet) is that my testing
> method & messages are the same on Ubuntu and CentOS and that it works
> on the Ubuntu version.
Are you sure that the messages sent via the Ubuntu version are exactly
the same as the message sent via the CentOS version? If for example the
message sent via the Ubuntu system is sent by Zimbra but the message
sent via the CentOS version is sent via Exchange then it's kind of
comparing apples and oranges. It might be that one mail client (server?)
adds certain headers with 8 digits and the other mail client (server?) not.
Kind regards,
CipherMail support
--
CipherMail email encryption
Email encryption with support for S/MIME, OpenPGP, PDF encryption and
secure webmail pull.
https://www.ciphermail.com
Twitter: http://twitter.com/CipherMail
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