As far as NoAuth, I think that's pretty much a closed issue - there's not
really any support for that among the development community. You might try,
instead, using either SSO or LDAP and then using the ${GUAC_USERNAME} and
${GUAC_PASSWORD} tokens to pass through authentication such that you can avoid
the dual-login requirements. I do understand the frustration there - I've
lived the admin side of things for long enough that I recognize that you want
to make the experience as simple as possible for users, and asking them to
login twice can cause frustration. I also realize that use of SSO or LDAP
modules would require your destination SSH server to use the same
authentication that Guacamole does, and that that's not always possible, but
you can probably work something out, there.
Yeah, probably good to go ahead and log a JIRA issue for the IP issue you're
seeing.
-Nick
On Thursday, August 24, 2017, 11:45:40 AM EDT, Tjareson <[email protected]> wrote:
Yes, I saw some discussion about the no-auth as well. It's a bit of a pity
that it will be removed.
Even if off-topic here right now: I think in the end it will in fact make it
more confusing for the user. Today I can tell the user "You only ever type your
credentials into the login screen of the application, never anywhere else."
Which makes it clear and easy to remember and avoids fishing.
Without no-auth, the user has to login either at login screen of guacamole
and/or at the login screen of the application, in case he or she connects on
the internal network directly with a Putty client. So we are loosing that
unique point where to type in login data only.
Is that still under discussion, means is there a point where I can mention my
argument?
Back to the topic: if you could find something where the ip behaviour could be
changed that would be very helpful.
Would it make sense, if I log an issue for that?
I've also checked the option to track down the web ip of a ssh session with
lsof and netstat and all logs, to see who is talking to whom via which ports.
But it always stops where communication is aggregated in one single process and
connections becoming 1:n. (e.g. nginx)
kind regards
Tjareson
Am 24.08.2017 um 09:02 schrieb Nick Couchman:
A word of caution about no-auth: it is deprecated, no longer maintained or
supported, and will not be available in future releases.
As far as why it's not getting updated, I'm not sure off the top of my head,
except that there's likely a session somewhere in the Guacamole Servlet code
that has the data cached for a particular user login. I'll see if I can do
some debugging on this and figure out where it's happening and what needs to be
done to flush it out.
-Nick
== He has shown you, O man, what is good; And what does the LORD require of
you But to do justly, To love mercy, And to walk humbly with your God? --Micah
6:8-- ==
On Wednesday, August 23, 2017, 7:16:51 PM EDT, Tjareson <[email protected]>
wrote:
By the way: I see the same phenomenon when I'm using no-auth, where there is
no specific user anymore.
If it works proper with no-auth it would have been a solution in my case
already as the application does a proper authentication anyway. (so currently
I'm redirecting all users to a url containing a default user name and password,
so they do not need to authenticate twice.)
So the not changing ip address in ${GUAC_CLIENT_ADDRESS} remains kind of a
question mark.
Am 23.08.2017 um 17:38 schrieb Nick Couchman:
There may be some buffering done inside the Guacamole code somewhere - I'm
not sure about that. Maybe Mike or James can chime in and confirm or debunk
that?
-Nick
On Wednesday, August 23, 2017, 5:10:19 PM EDT, Tjareson <[email protected]>
wrote:
Hi Nick,
that did the trick.
Do you know if there is any setting stopping tomcat7 (or maybe guacd) from
buffering the ip?
Currently I have the odd situation that if I log in from a different ip
address with the same user I see this different ip address in catalina.out, but
the first ip it got after starting tomcat stays in ${GUAC_CLIENT_ADDRESS}, no
matter if I logout the user before or not.
It looks like that the user session for a particular username in guacamole
gets buffered somewhere.
Only if I restart tomcat then the ip gets updated.
The odd thing is: catalina.out shows always the correct ip and a restart of
guacd doesn't reset this link between username and ip of first login.
I'm not sure, if the connection between tomcat and guacamole gets really
terminated, when the user logs out, as the user is falling back on the
guacamole login screen only, which would probably explain that the ip from the
first session survives somehow, even if the same user logs in from a different
ip.
kind regards
Tjareson
Am 23.08.2017 um 14:46 schrieb Nick Couchman:
In addition to what you've set up there (which I believe is correct), you
also need to add the remote IP valve to your Tomcat configuration file. I did
this by adding this block of code just inside the closing </Host> tag in my
server.xml file:
<Valve className="org.apache.catalina.valves.RemoteIpValve"
internalProxies="127.0.0.1"
remoteIpHeader="x-forwarded-for"
remoteIpProxiesHeader="x-forwarded-by"
protocolHeader="x-forwarded-proto" />
Please note that you should research and consider the security implications
of enabling this. I dug into it when I added the functionality for the
GUAC_CLIENT_ADDRESS token, but it's been long enough that I don't recall
exactly what the risks are. I believe that you need to pay particular
attention to the value of "internalProxies" and make sure that you trust the
hosts listed as internal proxies - that is, that someone you don't trust does
not have access to those systems in a way that would allow them to use the
remote IP valve to do something malicious, deceptive, etc.
Obviously this is specific to Tomcat + Nginx - I can't remember what the
steps are for Tomcat + Apache and have never tried it with any other
application server (JBoss, Weblogic, etc.).
-Nick
On Wednesday, August 23, 2017, 2:29:16 PM EDT, Tjareson <[email protected]>
wrote:
Hi
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 127.0.0.1 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
Tjareson
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
functionality...but...it 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
<[email protected]> 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 <[email protected]>
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 application
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 127.0.0.1 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
