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Unrestricted web access

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Unrestricted web access - 2.Dec.2009 5:04:40 AM   
stuarta

 

Posts: 88
Joined: 4.Sep.2008
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In my policies, I have a rule called unrestricted web access, that does exactly as it says.  For users, it's set to All Users, which I would like to be able to restrict this, or at least have All authenticated users, in hope that I would start losing some of the 'anonymous' entries in the log.

Unfortunately, as soon as I remove All Users an put in All Authenticated and even System and Network, my email stops sending.  It looks as though it might be because my domain servers are failing on DNS query.

Surely shouldn't these servers come under the authenticated users?  Is it something else that my installers did wrong?

Thanks
Post #: 1
RE: Unrestricted web access - 2.Dec.2009 8:38:32 AM   
hrsanchez

 

Posts: 146
Joined: 30.Nov.2007
From: Argentina
Status: offline
Stuarta,

You have to make rules in order to publish and permit Smtp protocol to your email server and permit DNS protocol to your Dns servers.
In order to help you , Could you show me how are the Isa rules now ?; how is the rule unrestricted web access ?, permit all protocols to all users from internal to external ?
regards,

_____________________________

Eng.Hector Sanchez
MCSE + Security 2000/2003
MCTS Isa 2004/Isa 2006

(in reply to stuarta)
Post #: 2
RE: Unrestricted web access - 2.Dec.2009 8:47:06 AM   
stuarta

 

Posts: 88
Joined: 4.Sep.2008
Status: offline
Hi thanks for the reply.

The Unrestricted one is for all outbound traffic from internal/local host to external/local host.

I do however have a SMTP rule to allow DNS/SMTP/SMTP Server from External/Internal/Local Host to External/Internal/Local Host and that is for all users

(in reply to hrsanchez)
Post #: 3
RE: Unrestricted web access - 2.Dec.2009 9:08:28 AM   
stuarta

 

Posts: 88
Joined: 4.Sep.2008
Status: offline
The denied dns requests I have are for our dns redirectors, opendns and our isp dns servers.

(in reply to stuarta)
Post #: 4
RE: Unrestricted web access - 2.Dec.2009 10:24:54 AM   
hrsanchez

 

Posts: 146
Joined: 30.Nov.2007
From: Argentina
Status: offline
For example, you could do the following rules, in this order:

Name: Publish smtp server
Action: Allow
Protocol: Smtp server
From :External
to: IP host mail server

Name : Permit SMTP
Action: Allow
Protocol: Smtp server, Smtp
From : Ip host mailserver
to: External
Condition: All users

Name : Permit DNS
Action: Allow
Protocols: DNS
From: Ip hosts DNS servers
To: External
Condition: All users

Name: Web and ftp access
Action: Allow
Protocols: Ftp, Http, Https
From: Internal
To: External
Condition: All Authenticate users

Last default rule
Action: Deny
Protocols: All trafic
From: all netwaorks
To: all networks
Condition: All users

_____________________________

Eng.Hector Sanchez
MCSE + Security 2000/2003
MCTS Isa 2004/Isa 2006

(in reply to stuarta)
Post #: 5
RE: Unrestricted web access - 2.Dec.2009 10:34:45 AM   
stuarta

 

Posts: 88
Joined: 4.Sep.2008
Status: offline
That is effectively what I have

Name:  Blanket SMTP rule
Action: Allow
Protocol: SMTP, SMTP Server, DNS
From: External, Internal, Local Host
To: External, Internal, Local Host
Condition: All Users

(in reply to hrsanchez)
Post #: 6
RE: Unrestricted web access - 2.Dec.2009 10:58:14 AM   
stuarta

 

Posts: 88
Joined: 4.Sep.2008
Status: offline
Think I may have done it.  Created a new rule with

Name:  Publish DNS
Action:  Alow
Protocol:  DNS
From:  ip of dns server
To:  External
Condition:  All Users.

I managed to remove all users from web access and emails did send, although my ping stopped and web was a bit unstable

(in reply to stuarta)
Post #: 7
RE: Unrestricted web access - 2.Dec.2009 11:03:10 AM   
stuarta

 

Posts: 88
Joined: 4.Sep.2008
Status: offline
just tried again and seems to be ok, must have just been a blip with the internet anyway.

Now that I'm using just All Authenticated Users for web access, would I be right in thinking that this will alleviate some of the 'anonymous' in the logs and show the username?

Should they be running the ISA Firewall client on their machines?

(in reply to stuarta)
Post #: 8
RE: Unrestricted web access - 2.Dec.2009 11:08:10 AM   
hrsanchez

 

Posts: 146
Joined: 30.Nov.2007
From: Argentina
Status: offline
I recommend you to split the rule into several rules:

Two fo smtp, one to publish smtp server ( in order to do it you can use the wizard -> right click Firewall policies -> new -> mail server publishing rule ) and one smtp access rule .

One for Dns access rule.
One for Ftp, Http Https access rule
and other access rules that you could need.

_____________________________

Eng.Hector Sanchez
MCSE + Security 2000/2003
MCTS Isa 2004/Isa 2006

(in reply to stuarta)
Post #: 9
RE: Unrestricted web access - 2.Dec.2009 11:12:14 AM   
stuarta

 

Posts: 88
Joined: 4.Sep.2008
Status: offline
ok the only problem I appear to have at the moment is that with just that user group, only my ISA server is browsing/pinging outside world.  My laptop is, but a couple of my servers aren't.

I'm guessing therefore they aren't authenticating properly

(in reply to hrsanchez)
Post #: 10
RE: Unrestricted web access - 2.Dec.2009 11:14:54 AM   
hrsanchez

 

Posts: 146
Joined: 30.Nov.2007
From: Argentina
Status: offline
You could use Isa firewall client in order to identify users an control protocols other than ftp, http and https.
(web proxy client only works with ftp, http and https and secure nat client cannot identify users).

_____________________________

Eng.Hector Sanchez
MCSE + Security 2000/2003
MCTS Isa 2004/Isa 2006

(in reply to stuarta)
Post #: 11
RE: Unrestricted web access - 2.Dec.2009 11:20:04 AM   
stuarta

 

Posts: 88
Joined: 4.Sep.2008
Status: offline
ok, well to be honest it's only web traffic I'm interested in, a better log of what sites have been visited.

I've had to put all users back on for now in order for my servers to contact web

(in reply to hrsanchez)
Post #: 12
RE: Unrestricted web access - 2.Dec.2009 3:32:11 PM   
hrsanchez

 

Posts: 146
Joined: 30.Nov.2007
From: Argentina
Status: offline
You could make special rules , where you allow access traffic for protocols you need from specific computers to external network
First create the computer object for your servers( tools -> network object - > create computer object ).

for example:

Rule name: Access servers to internet
Action: Allow
Protocols: All outbound trafic
From: specific computers you create
to: External
condition: All users

_____________________________

Eng.Hector Sanchez
MCSE + Security 2000/2003
MCTS Isa 2004/Isa 2006

(in reply to stuarta)
Post #: 13
RE: Unrestricted web access - 3.Dec.2009 3:35:29 AM   
stuarta

 

Posts: 88
Joined: 4.Sep.2008
Status: offline
yep thought of that last night while sleeping 

Only issue now is that I can't ping from any machine apart from the ISA server.  Checked the protocols but they are set to All Outbound Traffic, but again only works if I enable All Users.

Just managed to get around it by creating yet another rule to enable ping for all users.  Getting messy though with these little ones, worried that I may have an authentication problem.

< Message edited by stuarta -- 3.Dec.2009 3:38:44 AM >

(in reply to stuarta)
Post #: 14
RE: Unrestricted web access - 3.Dec.2009 8:33:07 AM   
hrsanchez

 

Posts: 146
Joined: 30.Nov.2007
From: Argentina
Status: offline
In order to ping from any workstation from internal network to internet:

1- Configure Isa server as default gateway in the workstations.
2- Make a access rule for Ping protocol ( icmp )to all authenticate users.

Name: Ping to internet access
Action: Allow
Protocols: Ping
From: Internal
To: External
Condition: All Authenticate users

3- Install Isa firewall client in the workstation. ( you need to authenticate users )

_____________________________

Eng.Hector Sanchez
MCSE + Security 2000/2003
MCTS Isa 2004/Isa 2006

(in reply to stuarta)
Post #: 15

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