Antwort: Re: web browsing in production environment - a journey through comfort and security

[info () hitcon de]

fortunately it is someone elses corporate network (whoever and wherever) 
and besides theres nothing special in here.....



Von:
Robin Wood <dninja () gmail com>
An:
info () hitcon de
Kopie:
security-basics () securityfocus com
Datum:
06.07.2009 21:50
Betreff:
Re: web browsing in production environment - a journey through  comfort 
and security



2009/7/6  <info () hitcon de>:
> today we have a environment which is arranged as follows:
>
> - a windows 2003 domain
> - a citrix terminal server farm ( 6 servers, 120 employees )
> - a astaro firewall appliance ( with web security - it uses its own 
proxy
> service (astaro engineered) and anti virus modules - clam & avira )
> - a squid proxy server (3.x) (it does authentication against domino 
ldap)
> with trend micro web security suite and squidguard for some url 
filtering
> (mainly pron) - the blacklists are updated once a day
>
> * web browsing is only possible via the citrix sessions of the users ( 
no
> local access from desktop or from somewhere else). unfortunately we need 
to
> use internet explorer (7) because most of the sites, which users reach 
work
> only with IE :-(
> ( i already tried to migrate firefox without success )
>
> * we limit the active content of websites via microsoft group policies.
> only websites which are registered as trusted sites in group policies 
can
> show its active content ( java, active x, javascript etc)
>
> * we have a chain of proxy servers. (see list of environment).
>
> so if a user start its internet explorer in it's citrix session, the IE
> passes its way through the proxy servers:
>
> 1. checks if the website is a trusted site in group policy or not and
> starts active content or not
>
> 2. squid proxy server (located in demilitarised zone) -> authentication
> against LDAP (and logs all requests with username, ip, etc.)
>
> 3. Checks SquidGuard if website is on  blacklist
>
> 4. passes traffic to trend micro web security suite ( anti virus engine 
for
> http(s) and ftp )
>
> 5. passes the traffic to the astaro (which is the parent proxy) which 
uses
> its own scanners (clam and avira)

I don't know an answer to your question but I would suggest that
putting out this much information about your corporate network is not
a good idea.

Robin

------------------------------------------------------------------------
Securing Apache Web Server with thawte Digital Certificate
In this guide we examine the importance of Apache-SSL and who needs an SSL 
certificate.  We look at how SSL works, how it benefits your company and 
how your customers can tell if a site is secure. You will find out how to 
test, purchase, install and use a thawte Digital Certificate on your 
Apache web server. Throughout, best practices for set-up are highlighted 
to help you ensure efficient ongoing management of your encryption keys 
and digital certificates.

http://www.dinclinx.com/Redirect.aspx?36;4175;25;1371;0;5;946;e13b6be442f727d1

------------------------------------------------------------------------







HITCON AG
Maik Linnemann
Gartenstraße 208
48143 Münster
+49 (251) 2801-205 (Phone)
+49 (251) 2801-280 (Fax)
+49 (170) 6364-205 (Mobil)
mailto:info () hitcon de
http://www.hitcon.de

Mitglieder des Vorstandes: Helmut Holtstiege, Tobias Helling
Vorsitzender des Aufsichtsrats: Hans-Hermann Schumacher
 
Sitz der Gesellschaft: Münster
Registergericht: Amtsgericht Münster, HRB 5177

member of http://www.grouplink.de
·

------------------------------------------------------------------------
Securing Apache Web Server with thawte Digital Certificate
In this guide we examine the importance of Apache-SSL and who needs an SSL certificate.  We look at how SSL works, how 
it benefits your company and how your customers can tell if a site is secure. You will find out how to test, purchase, 
install and use a thawte Digital Certificate on your Apache web server. Throughout, best practices for set-up are 
highlighted to help you ensure efficient ongoing management of your encryption keys and digital certificates.

http://www.dinclinx.com/Redirect.aspx?36;4175;25;1371;0;5;946;e13b6be442f727d1
------------------------------------------------------------------------