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Old 01-20-2008, 03:48 AM   #1
Registered: Dec 2006
Distribution: Debian,Slackware,FreeBSD,CentOS,Red Hat,Windows Server 2008
Posts: 133

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Https Shorewall Problem

I configured shorewall and squid, and created two zones, and rules to bind http connections to squid, but i got a problem with https connections port 443 and here is my rules config file:

# This is for squid and is working well
REDIRECT loc 3128 tcp - !
# for https
ACCEPT loc net tcp https
ACCEPT net loc tcp https
ACCEPT net $FW tcp https
Old 01-21-2008, 02:53 AM   #2
Registered: Oct 2006
Location: High Wycombe, Bucks, UK.
Distribution: Debian and Fedora Core in equal measure
Posts: 264

Rep: Reputation: 33
Hmmm...think about what https is trying to wants to set up an encrypted session between client and server, but you are trying to interpose a proxy between them....looks a bit like a "man-in-the-middle" attack to the https devices, so the session is not established. You need to tunnel the https, but beware, once tunnelled through squid, squid can't interpret any of the traffic or act on it, 'cos it can't see it "inside" the tunnel.

From the FAQ:

"As of version 2.5, Squid can terminate SSL connections. This is perhaps only useful in a surrogate (http accelerator) configuration. You must run configure with --enable-ssl. See https_port in squid.conf for more information.

Squid also supports these encrypted protocols by ``tunelling'' traffic between clients and servers. In this case, Squid can relay the encrypted bits between a client and a server.

Normally, when your browser comes across an https URL, it does one of two things:

The browser opens an SSL connection directly to the origin server.
The browser tunnels the request through Squid with the CONNECT request method.

The CONNECT method is a way to tunnel any kind of connection through an HTTP proxy. The proxy doesn't understand or interpret the contents. It just passes bytes back and forth between the client and server. For the gory details on tunnelling and the CONNECT method, please see RFC 2817 and Tunneling TCP based protocols through Web proxy servers (expired)."

RTFM. Google is your friend.


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