> -----Original Message-----
> From: Brian Eller <bel...@guidehousefederal.com>
> Sent: Thursday, May 19, 2022 9:29 AM
> To: Tomcat Users List <users@tomcat.apache.org>
> Subject: RE: Encryption of Tomcat AJP
> 
> TRADING PARTNER
> 
> Thank you Mark,
> 
>         My vendor supports AJP but, I don't know if they support
> mod_http_proxy.  This is a embedded version of Tomcat 8.5 that is tightly
> coupled with the vendor's software and is an installed subcomponent from
> the vendor.
> 
> 
> Brian Eller  |  Senior System Administrator bel...@guidehouse.com
> 
> Ace Info Solutions (AceInfo), a Guidehouse company | aceinfosolutions.com
> 1200 South College Avenue, Suite 210 | Fort Collins, CO 80524 AceInfo is now
> a Guidehouse company
> 
> -----Original Message-----
> From: Mark H. Wood <mw...@iupui.edu>
> Sent: Thursday, May 19, 2022 6:12 AM
> To: users@tomcat.apache.org
> Subject: Re: Encryption of Tomcat AJP
> 
> On Thu, May 19, 2022 at 07:09:59AM +0000, Hiran CHAUDHURI wrote:
> > CONFIDENTIAL & RESTRICTED
> >
> > From: Mark Thomas <ma...@apache.org>
> > Subject: Re: Encryption of Tomcat AJP
> >
> > >On 19/05/2022 01:32, Brian Eller wrote:
> > >> TRADING PARTNER
> > >>
> > >> Hello,
> > >>
> > >>                  I am working on a Tomcat install embedded inside a 
> > >> vendor
> product that uses Apache to pass traffic to Tomcat.  My cyber security group
> is asking if we can encrypt all connections.  Does the mod_jk protocol, AJP
> can be encrypted?
> > >
> > >No, AJP does not support encryption.
> > >
> > >If you want to encrypt traffic between the reverse proxy and the
> embedded Tomcat instance I'd recommend using mod_proxy_http and
> proxy everything over HTTPS. This requires a little more configuration to get
> things working.
> > >
> > >The main thing to keep in mind is to make sure that the Tomcat instance
> correctly identifies whether the client connection to the reverse proxy was
> over HTTP or HTTPS.
> > >
> > >Mark
> >
> > I totally agree this is an existing and sufficient mechanism already 
> > available.
> And I see it popping up in more and more locations.
> > But as you point out there are some caveats that potentially open security
> risks. On the contrary AJP - maybe because it cannot be configured with
> encryption - looks simple and straightforward.
> >
> > Would it make sense to create a solution with less caveats and up to date
> security requirements?
> 
> If the OP's cyber security group insists, then maybe they would care to give
> him their requirements and suggestions for setting up IPSEC.
> 
> --
> Mark H. Wood
> Lead Technology Analyst
> 
> University Library
> Indiana University - Purdue University Indianapolis
> 755 W. Michigan Street
> Indianapolis, IN 46202
> 317-274-0749
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> 

Another thing to consider. If your Apache HTTPD server, or even IIS web server, 
are co-hosted on the same server, setup the AJP to listen and communicate on 
localhost (127.0.0.1) and you shouldn't have to even think about encryption at 
that point. Another possibility would be to port the traffic over a secure VPN 
between the servers, but that may be a costly alternative.

Otherwise, I agree with Mark and go with MOD-PROXY over HTTPS.

Just my .02 worth.



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