The Tomcat version I am using is 9.0.20. I will take a look at the changelog. 

This is the first time I have tried this, and I couldn't find much info, so I 
appreciate the feedback. I will look for info about "secret". 

I wasn't sure about the format on the Apache side for the 
ProxyPass/ProxyPassReverse - does what I posted look all right?

Also, when I was searching around for info, I saw some comments that seem to be 
saying that the "tomcatAuthentication" parameter on the Tomcat connection was 
no longer supported or something like that?

Also re. "secret" on the Tomcat side: If that is set to, for example, 
"mysecret", how do I pass that on the Apache side?

Thanks again,

     On Friday, May 15, 2020, 03:33:19 AM EDT, Olaf Kock <tom...@olafkock.de> 
On 15.05.20 09:06, oh...@yahoo.com.INVALID wrote:
> Hi,
> I am using an Apache proxy in front of Tomcat 9, and I am using AJP 
> connection to connect from the Apache to Tomcat, and I have the Apache 
> sending a username to the Tomcat in a REMOTE_USER header.
> In the Tomcat server.xml I have:
>  <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" 
> In the Apache httpd.conf, to test, this I have:
> <LocationMatch /myapp*>
> ProxyPass ajp://192.168.218.XX:8009
> ProxyPassReverse ajp://192.168.XX.224:8009
> </LocationMatch>
> But when I access the app via the Apache, it is not automatically logging me 
> into the app.
> Is there anything else that I have to do to get this to work besides what I 
> did above?  Is there something that I have to modify in the app itself to get 
> this to work?

Hi Jim,

which exact version of Tomcat 9 are you using? Note that there were
significant changes for the default and required configuration for the
AJP connector, in order to use it. Best to find all of them: Search for
AJP in the change log tomcat.apache.org/tomcat-9.0-doc/changelog.html

Notable among them: Everything to do with "secret", and the default bind
address, "localhost", for the AJP connector. i.e. I'd expect this
configuration to be insufficient for any of the latest releases.

I haven't ever used this REMOTE_USER authentication, but nothing in the
configuration that you've posted gives any clue about what you do and
what you send. I would expect Tomcat to *not* blindly accept any
REMOTE_USER header by default, unless it's whitelisted and explicitly
asked for - it otherwise would be a great way to exploit servers that
don't have a remote proxy (or one where the remote proxy is configured
to remove this header). Nothing in the configuration you post gives me a
hint about what you do to make tomcat accept and trust this header.


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