Firewall Wizards mailing list archives
Re: Application Proxy/L7 Firewall Recommendation?
From: John Adams <jna-dated-1031681827.333800 () retina net>
Date: Thu, 5 Sep 2002 11:17:05 -0700 (PDT)
On Thu, 5 Sep 2002, Balazs Scheidler wrote:
And yes SSL means that you can peek into decrypted SSL streams. (url filtering in HTTPS, anyone?) You can limit CONNECT, or stack in a decrypting HTTPS proxy within the CONNECT method to avoid instant messengers to go through your firewall.
How do they implement this? Consider this: I attempt to connect to a site via HTTPS, and the certificate presented by your decrypting proxy doesn't match the expected certificate of the site I'm connecting to. Therefore, I know that there's a man-in-the-middle attempting to decrypt my session. This is exactly the sort of action that SSL was designed to prevent. Note also that there's many other ways to tunnel illegitimate traffic inside of legtimate traffic; these sorts of L7 proxies only prevent people who don't know what they're doing from establishing a connection to where they want to go. -john _______________________________________________ firewall-wizards mailing list firewall-wizards () honor icsalabs com http://honor.icsalabs.com/mailman/listinfo/firewall-wizards
Current thread:
- Application Proxy/L7 Firewall Recommendation? Jeff Newton (Sep 05)
- Re: Application Proxy/L7 Firewall Recommendation? Balazs Scheidler (Sep 05)
- Re: Application Proxy/L7 Firewall Recommendation? John Adams (Sep 05)
- Re: Application Proxy/L7 Firewall Recommendation? Carson Gaspar (Sep 06)
- Re: Application Proxy/L7 Firewall Recommendation? Adam Shostack (Sep 06)
- Re: Application Proxy/L7 Firewall Recommendation? Carson Gaspar (Sep 06)
- Re: Application Proxy/L7 Firewall Recommendation? John Adams (Sep 05)
- Re: Application Proxy/L7 Firewall Recommendation? Balazs Scheidler (Sep 06)
- Re: Application Proxy/L7 Firewall Recommendation? Balazs Scheidler (Sep 05)
- Re: Application Proxy/L7 Firewall Recommendation? Carson Gaspar (Sep 05)
- <Possible follow-ups>
- RE: Application Proxy/L7 Firewall Recommendation? Dawes, Rogan (ZA - Johannesburg) (Sep 05)
- RE: Application Proxy/L7 Firewall Recommendation? Noonan, Wesley (Sep 06)
- RE: Application Proxy/L7 Firewall Recommendation? ark (Sep 09)
- RE: Application Proxy/L7 Firewall Recommendation? Paul D. Robertson (Sep 09)
- Re: Application Proxy/L7 Firewall Recommendation? ark (Sep 09)
- RE: Application Proxy/L7 Firewall Recommendation? Paul D. Robertson (Sep 09)