Re: Prividing Intranet Website Access To External Users

[<ben.smethurst () orange net>]

In-Reply-To: <25E5794BFEA11E4AAA83359BC2D0E28003F5A402 () LDNPSMEU002VEUA INTRANET BARCAPINT COM>

Ideally, I really wouldnt like to be having my company intranet on the 
dmz, or allowing access from the internet to a natted address of an 
internal server

I would probably integrate the ldap/dc as a security server on the 
firewall and have the remote users authenticate against the ldap/dc 
when they hit the firewall and then pass them through to the intranet 
server. You will probably somehow need to let the intranet server know 
that the user has been authenticated by the dc when they connected 
through the firewall, so that the user doesn't have to authenticate a 
second time when they hit the web server. I agree, its slightly less 
transparent than directly browsing to the webserver, but would 
probably be more secure

I think the ssl vpn.. could also be an option, 

If you've got checkpoint, you could buy the connectra ssl network 
extender product which will do the this kind of job very well, or you 
could look at the firepass ssl vpn solution.

Regards
Ben Smethurst









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> Subject: RE: Prividing Intranet Website Access To External Users
> Date: Thu, 10 Feb 2005 08:22:40 -0000
> Message-ID: 
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EUA.INTRANET.BARCAPINT.COM>
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> Thread-Topic: Prividing Intranet Website Access To External Users
> Thread-Index: AcUPQczM6h6Z+S26RsWekiEdCkdDSgAB9loQ
> From: <Steve.Cummings () barclayscapital com>
> To: <gabriel_orozco () mx sumida com>, <rustychiles () gmail com>,
>       <security-basics () securityfocus com>
> X-OriginalArrivalTime: 10 Feb 2005 08:22:40.0839 (UTC) 
>    FILETIME=[AFEB4D70:01C50F49]
>
> Stronghold from redhat would be a good fit
>
> Regards
>
> Steve Cummings=20
> Web Services
> Barclays Capital
> > *Direct:   +44 (0) 207 773 4245
> > * E-Mail: steve.cummings () barclayscapital com
>
>
> -----Original Message-----
> From: Gabriel Orozco [mailto:gabriel_orozco () mx sumida com]=20
> Sent: 07 February 2005 19:10
> To: rusty chiles; security-basics () securityfocus com
> Subject: Re: Prividing Intranet Website Access To External Users
>
>
> I would install a reverse proxy, like apache, just connect to the
> internal web server and the firewall filter every other traffic.
>
> ----- Original Message -----
> From: "rusty chiles" <rustychiles () gmail com>
> To: <security-basics () securityfocus com>
> Sent: Friday, February 04, 2005 6:16 PM
> Subject: Prividing Intranet Website Access To External Users
>
>
> > Greetings,
> >
> > I'm asking for reccomendations with the following Scenario:
> >
> > We have a internal intranet site. Users are authenticated using 
their=20
> > nt credentials.
> >
> > We need to provide the site externally, translate the internal 
links=20
> > to external links, and still pass their NT credentials to the website.
> >
> >  MGMT wants to do this without vpn, or any other 3rd party 
software on
> > the clients computer.
> >
> > The goal here is a single user sign on, so that the end user is=20
> > presented with the same experience at home as they are at work.
> >
> > We WILL use SSL to protect the transportation of the userid and=20
> > password.
> >
> > The web server is IIS on windows2003.
> >
> > The web server will be in the DMZ, and only port 443 will be 
allowed=20
> > from the outside world.
> >
> > The problem is that webserver in the dmz will need to have the 
ability
> > to talk to the domain controller, as well as a sql server.
> >
> > I prefer my resources be separated, and never have internal 
servers=20
> > traverse the dmz, but in this case that is not possible due to a=20
> > dependency on the website having tight integration with Active=20
> > directory resources.
> >
> > We could put a sql box in the dmz, but a domain controller....... 
I=20
> > don't feel comfortable doing that. One box in the dmz is 
compromised,=20
> > then the DC is open to direct attack.
> >
> > If the box talks from the dmz to the internal Domain controller, 
we=20
> > can acl the traffic so that it only talks over limited port numbers;
=20
> > however there is still some risk involved. (which we may have to
> > accept)
> >
> > What experience have members of this list had with publishing 
their=20
> > intranets to the internet in a secure manner.
> >
> > What has worked reliably, and still provided solid security.
> >
> > I've considered a SSL VPN type portal, ISA Server, and the like 
as=20
> > well as several forwarding proxies, but am not 100% comfortable 
with=20
> > any of the solutions I have seen thus far.
> >
> > Any reccomendations List members can make will be helpful to us.
>
>
>
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