You actually has it right, it intercepts and re-signs the
certificate. The way you prevent this generating a warning to the
user is by creating a CA for your domain and ensuring all machines
have this set as a trusted CA. If you are using something like
Bluecoat, you then intercept and re-sign the certs with that CA or a
subsidiary of the CA. The users machine automatically trusts that re-
signed certificate because of these previous steps, and allows you to
inspect the SSL traffic.
Cheers,
Tremaine Lea
Network Security Consultant
On 13-Mar-07, at 9:20 AM, Hari Sekhon wrote:
does anyone understand how these products can inspect SSL?
Perhaps I could understand if it was just the bitorrent encypted
traffic... but surely SSL is designed to be encrypted end to end?
You'd have to intercept the certificate and replace it, prompting a
warning to the user.
The only other way I can think of would be something like a
cryptographic weakness in SSL or brute forcing it somehow, but this
seems like it would take a ridiculous amount of computing power and
just doesn't seem possible...
If SSL is truely decryptable on the fly in real-time in this way
(or even just from packet captures after some effort) it would
effectively render all e-business too dangerous to ever do again.
I'd never buy another book from Amazon ever again!
Anyone care to explain how these products are supposed to work and
if they really can decrypt SSL or if this is marketing speech for
noticing encrypted patterns which isn't the same thing?
-h
Hari Sekhon
Kevin Overcash wrote:
Breach Security has a product called BreachView SSL that passively
decrypts SSL traffic for an IDS without terminating the SSL
session. The product comes as either a software plug-in or an
appliance.
http://www.breach.com/products_breachviewssl.aspI can't (although
personally I haven't encrypted bitorrent so
ko
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Panayiotis
Psihoyios
Sent: Thursday, March 08, 2007 10:01 AM
To: 'Ove Dalgård Hansen'; [email protected]
Subject: RE: Bittorrent - utorrent
Since it is going through SSL (and no IDS can look into SSL), you
have two
options:
Plan A: Deny SSL traffic, but that usually this is not possible,
Plan B: Let your users out through a proxy server, which will
identify
non-browser traffic using http/s header inspection. Configure your
firewall
to permit HTTP/S out only from your proxy and not your clients.
Regards,
Panayiotis
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of Ove Dalgard Hansen
Sent: Wednesday, March 07, 2007 9:38 PM
To: [email protected]
Subject: Bittorrent - utorrent
Hello Everyone,
I am in a bit of trouble,
On a network where i am configuring IDS - using ASA5510 + SSM
module, we try
to deny access to Bittorrent downloads - it consumes quite a bit
of bandwith
and is not allowed by the company's policy.
We try to filter bittorrent which succedes - but the utorrent changes
protocol and goes by the SSL port 443 and thereby circumvent the
IDS, since
its not possible to see the encrypted traffic.
Does anyone out there have a good idea of how i am to solve the
issue?
Best Regards
Ove Hansen
IT-Quality A/S Banemarksvej 50F
Denmark - 2605
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