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From Tjareson <>
Subject Re: IP of web session for ssh connection
Date Wed, 23 Aug 2017 18:29:09 GMT

the approach as such works in principle, as I get the ip passed through 
the ssh connection by just setting ${GUAC_CLIENT_ADDRESS} as command 
parameter in the ssh connection settings.
Unfortunately the ip is again. (same with ...HOSTNAME) My 
guess is it might be because I'm using nginx as reverse proxy.

Which ip is guacamole using to provide ${GUAC_CLIENT_ADDRESS/HOSTNAME}?

In the proxy setup I have set

|proxy_set_header Host $host; proxy_buffering off; proxy_http_version 
1.1; proxy_set_header X-Real-IP $remote_addr; proxy_set_header 
X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header 
X-Forwarded-Proto $scheme; proxy_set_header Upgrade $http_upgrade; 
proxy_set_header Connection $http_connection; proxy_pass 
http://localhost:8080/; |

Is anyone using the client IP in a similar setup?

kind regards

Am 23.08.2017 um 11:56 schrieb Tjareson:
> Hi Nick,
> the execute command option sounds like a good idea.
> I saw the ${GUAC_CLIENT_ADDRESS} token but wasn't aware that guacd 
> supports the command parameter for ssh connections.
> Usually I start the application after ssh login directly via 
> /etc/passwd, but by ssh command should work as well, so I can process 
> the ip as parameter of the application then. I just need to check then 
> to what extent that would allow users that use ssh directly to start 
> other applications then.
> I'll give that a try, thanks for the hint!
> regards
> Tjareson
> Am 23.08.2017 um 10:36 schrieb Nick Couchman:
>> Took a look at the available SSH client options, and I do not see an 
>> obvious way to pass through the client hostname/IP/identity to the 
>> server.  Here are the two options I see:
>> - As mentioned before, you can use the Execute Command parameter to 
>> pass through the identity using the token.  You'd have to set up a 
>> startup script or something like that, or figure out the right way to 
>> use the execute command option to set a variable and then launch the 
>> shell or whatever application you want to launch with that variable. 
>>  This is the only way to do it currently, and probably the best bet.
>> - It is possible to set up SSH clients and servers to send 
>> environment variables between the client and server.  I would imagine 
>> Guacamole could be tweaked to add this seems 
>> like a little bit of a corner case to add, particularly given that 
>> you'd have to both configure Guacamole to have some map of arbitrary 
>> environment variables and values (and sanitize them for security 
>> purposes), and, in order for this to work, the SSH server has to be 
>> configured, not just to allow variables, but with the specific list 
>> of variables that you want to pass through.  That's a lot of extra 
>> configuration to allow this behavior - particularly given the fact 
>> that you can just do it on the command line.
>> -Nick
>> On Wednesday, August 23, 2017, 9:49:36 AM EDT, Nick Couchman 
>> <> wrote:
>> Tjareson,
>> While RDP currently has an option to pass through the client name, 
>> SSH does not.  I need to look and see if there's an easy way to 
>> enable this functionality in Guacamole, but the only thing I'd 
>> suggest today is that you might be able to find a way to use the 
>> "Execute Command" parameter for SSH connections to pass in that token.
>> -Nick
>> On Wednesday, August 23, 2017, 9:34:55 AM EDT, Tjareson 
>> <> wrote:
>> Hi,
>> I'm using an ncurses based database application, which makes use of the
>> IP address of the ssh session from which it got used to e.g. chose the
>> right printer, rfid reader etc.
>> This became web enabled now with guacamole and I was wondering if there
>> is any easy way to get hold of the IP address of the web session which
>> is used to connect via ssh to that application mentioned above.
>> The setup is like this:
>> user <-> nginx <-> tomcat <-> guacd <-> ssh <-> ncurses
>> All components from nginx to the ncurses application are on the same
>> server. But of course from the application side it looks always that the
>> connection is coming from where tomcat/guacd sits, so in this
>> case.
>> I could probably somehow browse through all logs,
>> /proc/<process-id>/status and netstat to somehow figure out, who is
>> talking with whom, but I hope there is a more convenient approach for
>> this? I found that there is ${GUAC_CLIENT_ADDRESS} but I'm not sure if
>> there is any way to hand that over via ssh session.
>> regards
>> Tjareson

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