Leon,

On 6/14/21 16:26, Leon Rosenberg wrote:
Thanks for the response Mark,

quick question, do I have to add all cloudflare ips? They kindof
distributed along the world... Can I mark the thrustworthlyness by a header
instead?
kr
Leon

On Mon, Jun 14, 2021 at 9:45 PM Mark Thomas <ma...@apache.org> wrote:

On 14/06/2021 17:01, Leon Rosenberg wrote:
hi,
I have a tomcat 8.5.15 behind an apache behind cloudflare. I am trying to
"see" the user's ip in my logs. When I print out the headers I see that I
have headers in the request
CF-Connecting-IP
and
X-Forwarded-For
with real user's up, say 93.72.251.122. But when I make a request to
request.getRemoteAddr() it returns 162.158.103.188 which is cloudflare's
ip address, not the real one.
I added to the server.xml the remoteipvalue in different configuration
und
"Host", i.e.:
   <Valve className="org.apache.catalina.valves.RemoteIpValve"
remoteIpHeader="x-forwarded-for"
protocolHeader="x-forwarded-proto"
/>

   <Valve className="org.apache.catalina.valves.RemoteIpValve"
remoteIpHeader="X-Forwarded-For"
protocolHeader="X-Forwarded-Proto"
/>

or assuming for defaults:
   <Valve className="org.apache.catalina.valves.RemoteIpValve"
/>

or even:
   <Valve className="org.apache.catalina.valves.RemoteIpValve"
remoteIpHeader="CF-Connecting-IP"
/>

but none of them give me the getRemoteAddr properly. Is there a trick to
this configuration?

You need to tell Tomcat that 162.158.103.188 is trusted. Setting
trustedProxies="162\.158.103\.188" should do the trick.

There is debug logging in that Valve so you can set

org.apache.catalina.valves.RemoteIpValve.level=FINE

in $CATALINA_BASE/conf/logging.properties to get debug logging which
should help you see what is going on.

Mark

trustedProxies=".*" ??

What happens if someone connects to your origin server directly? Would you trust an X-Forwarded-For header from them?

-chris

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