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

[Robin Wood <dninja () gmail com>]

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

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