X2Go Bug report logs - #692
select_session offers offline servers to X2Go Client

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Message #5 received at submit@bugs.x2go.org (full text, mbox, reply):

From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

To: submit@bugs.x2go.org

Subject: select_session offers offline servers to X2Go Client

Date: Tue, 02 Dec 2014 12:33:41 +0000

[Message part 1 (text/plain, inline)]

Package: python-x2gobroker
Severity: important
Version: 0.0.3.0-preview

The X2Go Session Broker should be able to detect offline X2Go Servers.

It should not offer session via the select_session() method to X2Go  
Client, if a server is offline.

Mike

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Message #10 received at 684@bugs.x2go.org (full text, mbox, reply):

From: Sergey Savko <savko@tophouse.ru>

To: 684@bugs.x2go.org

Subject: select_session offers offline servers to X2Go Client

Date: Fri, 5 Dec 2014 20:14:51 +0400 (MSK)

[Message part 1 (text/plain, inline)]

This patch work after patch from http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=686

-- 
С уважением,
Сергей Савко,
начальник IT отдела.
+7-931-361-04-02

[0002-Gives-a-coefficient-of-1-for-the-server-if-the-serve.patch (text/x-patch, attachment)]

Message #15 received at 684@bugs.x2go.org (full text, mbox, reply):

From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

To: Sergey Savko <savko@tophouse.ru>, 684@bugs.x2go.org

Subject: Re: [X2Go-Dev] Bug#684: select_session offers offline servers to X2Go Client

Date: Sat, 06 Dec 2014 22:56:05 +0000

[Message part 1 (text/plain, inline)]

Control: clone -1 -2 -3
Control: reassign -2 x2goclient
Control: reassign -3 python-x2go
Control: retitle -1 add exclude-hosts parameter to selectsession task
Control: retitle -2 request another server from broker provided server is down
Control: retitle -3 request another server from broker provided server is down
Control: severity -1 wishlist
Control: severity -2 wishlist
Control: severity -3 wishlist
Control: block -2 by -1
Control: block -3 by -1
Control: tag -1 - patch

Hi Sergey,

On  Fr 05 Dez 2014 17:14:51 CET, Sergey Savko wrote:

> This patch work after patch from  
> http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=686

After thinking this through a little, I come to the conclusion that  
the broker cannot decide if a machine is down or not.

We have to think very generically. There may be a scenario where the  
broker machine may be on an network segment where it cannot ping/reach  
the X2Go Servers.

The X2Go Clients can reach the X2Go Broker. The broker provides an  
X2Go Server address on the "selectsession" broker task to the X2Go  
Client. Then the X2Go Client should test if that X2Go Server address  
works (via a simple ping6/ping command, machines should always be  
pingable!!!). If the ping fails, X2Go Client should go back to the  
broker and say: hey, that server failed for me, give me another one  
(but not the one you already gave me).

I fear we need to do four things for this bug to get fixed:

  1. extend broker/client communication protocol (second/third/...  
selectsession
     call with a list of hosts that did not work on previous attempts)
  2. extend X2Go Session Broker with an exclude-hosts (or so)  
parameter for the
     selectsession task
  3. Adapt X2Go Client: ping X2Go Server, go back to the broker if  
server is down
     and request another server
  4. Adapt Python X2Go: dito

Regards,
Mike

-- 

DAS-NETZWERKTEAM
mike gabriel, herweg 7, 24357 fleckeby
fon: +49 (1520) 1976 148

GnuPG Key ID 0x25771B31
mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de

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Message #30 received at 684@bugs.x2go.org (full text, mbox, reply):

From: Stefan Baur <X2Go-ML-1@baur-itcs.de>

To: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>, 684@bugs.x2go.org, Sergey Savko <savko@tophouse.ru>

Subject: Re: [X2Go-Dev] Bug#684: Bug#684: select_session offers offline servers to X2Go Client

Date: Sun, 07 Dec 2014 00:17:22 +0100

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Am 06.12.2014 um 23:56 schrieb Mike Gabriel:
> Then the X2Go Client should test if that X2Go Server address works
> (via a simple ping6/ping command, machines should always be
> pingable!!!)

Chiming in here:
Even if they aren't pingable - Port 22 (or whichever you've set in the
config as SSH port to be used) must be accepting connections.
You can test that on Linux with

nc -z ip.goes.he.re port_goes_here && echo "is reachable"

... and I'm sure there are ways to do that inside the client code, too.
Check if you can get a TCP handshake going within a set time frame (1
second? 2 seconds? 5 seconds?), then disconnect and proceed depending
on the result.

Actually ... simply lowering the timeout value for the currently
existing code that handles the connection, when called in broker
client mode, might already work.

- -Stefan

- -- 
BAUR-ITCS UG (haftungsbeschränkt)
Geschäftsführer: Stefan Baur
Eichenäckerweg 10, 89081 Ulm | Registergericht Ulm, HRB 724364
Fon/Fax 0731 40 34 66-36/-35 | USt-IdNr.: DE268653243
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Message #35 received at 684@bugs.x2go.org (full text, mbox, reply):

From: Sergey Savko <savko@tophouse.ru>

To: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>, 684@bugs.x2go.org

Subject: Re: [X2Go-Dev] Bug#684: select_session offers offline servers to X2Go Client

Date: Sun, 7 Dec 2014 03:45:28 +0400 (MSK)

If the server will give the address to which it can not connect, there will be no load balancing works. 
Since the server is connected to receive the coefficient of loading.


----- Исходное сообщение -----
От: "Mike Gabriel" <mike.gabriel@das-netzwerkteam.de>
Кому: "Sergey Savko" <savko@tophouse.ru>, 684@bugs.x2go.org
Отправленные: Воскресенье, 7 Декабрь 2014 г 1:56:05
Тема: Re: [X2Go-Dev] Bug#684: select_session offers offline servers to X2Go Client

Control: clone -1 -2 -3
Control: reassign -2 x2goclient
Control: reassign -3 python-x2go
Control: retitle -1 add exclude-hosts parameter to selectsession task
Control: retitle -2 request another server from broker provided server is down
Control: retitle -3 request another server from broker provided server is down
Control: severity -1 wishlist
Control: severity -2 wishlist
Control: severity -3 wishlist
Control: block -2 by -1
Control: block -3 by -1
Control: tag -1 - patch

Hi Sergey,

On  Fr 05 Dez 2014 17:14:51 CET, Sergey Savko wrote:

> This patch work after patch from  
> http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=686

After thinking this through a little, I come to the conclusion that  
the broker cannot decide if a machine is down or not.

We have to think very generically. There may be a scenario where the  
broker machine may be on an network segment where it cannot ping/reach  
the X2Go Servers.

The X2Go Clients can reach the X2Go Broker. The broker provides an  
X2Go Server address on the "selectsession" broker task to the X2Go  
Client. Then the X2Go Client should test if that X2Go Server address  
works (via a simple ping6/ping command, machines should always be  
pingable!!!). If the ping fails, X2Go Client should go back to the  
broker and say: hey, that server failed for me, give me another one  
(but not the one you already gave me).

I fear we need to do four things for this bug to get fixed:

   1. extend broker/client communication protocol (second/third/...  
selectsession
      call with a list of hosts that did not work on previous attempts)
   2. extend X2Go Session Broker with an exclude-hosts (or so)  
parameter for the
      selectsession task
   3. Adapt X2Go Client: ping X2Go Server, go back to the broker if  
server is down
      and request another server
   4. Adapt Python X2Go: dito

Regards,
Mike

-- 

DAS-NETZWERKTEAM
mike gabriel, herweg 7, 24357 fleckeby
fon: +49 (1520) 1976 148

GnuPG Key ID 0x25771B31
mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de

freeBusy:
https://mail.das-netzwerkteam.de/freebusy/m.gabriel%40das-netzwerkteam.de.xfb

Message #40 received at 684@bugs.x2go.org (full text, mbox, reply):

From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

To: Sergey Savko <savko@tophouse.ru>

Cc: 684@bugs.x2go.org, control@bugs.x2go.org

Subject: Re: [X2Go-Dev] Bug#684: select_session offers offline servers to X2Go Client

Date: Mon, 08 Dec 2014 07:23:39 +0000

[Message part 1 (text/plain, inline)]

clone #684 -1
retitle -1 select_session offers offline servers to X2Go Client
thanks

Hi Sergey,

On  So 07 Dez 2014 00:45:28 CET, Sergey Savko wrote:

> If the server will give the address to which it can not connect,  
> there will be no load balancing works.
> Since the server is connected to receive the coefficient of loading.

Actually, after a third or fourth though: in cases where we use SSH to  
connected from broker server to broker agent, there we can evaluate  
the online status of the X2Go Server. So, in those cases we should  
filter out, if a server is down or not and exclude that server from  
the list of possible X2Go Servers.

Plus, I still think, that X2Go Client should request another machine,  
if the provided server was offline and more than one server is  
configured in the broker's session profile.

So, cloning this bug again...

  #684: for tracking the new feature of re-requesting a server address
  new bug: filter out offline servers on the broker side already

Greets,
Mike



-- 

DAS-NETZWERKTEAM
mike gabriel, herweg 7, 24357 fleckeby
fon: +49 (1520) 1976 148

GnuPG Key ID 0x25771B31
mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de

freeBusy:
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Message #53 received at 692@bugs.x2go.org (full text, mbox, reply):

From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

To: 692-submitter@bugs.x2go.org

Cc: control@bugs.x2go.org, 692@bugs.x2go.org

Subject: X2Go issue (in src:x2gobroker) has been marked as pending for release

Date: Tue, 9 Dec 2014 13:08:40 +0100 (CET)

tag #692 pending
fixed #692 0.0.3.0
thanks

Hello,

X2Go issue #692 (src:x2gobroker) reported by you has been
fixed in X2Go Git. You can see the changelog below, and you can
check the diff of the fix at:

    http://code.x2go.org/gitweb?p=x2gobroker.git;a=commitdiff;h=e4be2b0

The issue will most likely be fixed in src:x2gobroker (0.0.3.0).

light+love
X2Go Git Admin (on behalf of the sender of this mail)

---
commit e4be2b012706014d49a330c2a1058f85a5f9977d
Author: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
Date:   Tue Dec 9 13:08:25 2014 +0100

    Don't return X2Go Servers that are actually down, currently.
    
        The X2Go Servers get probed via a short portscan on the remote's SSH port. If
        that portscan fails, another remote X2Go Server is chosen from the
        list of available server (if any). This portscanning functionality
        can be switched off via "default-portscan-x2goservers" in x2gobroker.conf
        or via "broker-portscan-x2goservers" per session profile. (Fixes:
        #692).

diff --git a/debian/changelog b/debian/changelog
index 02ed4b3..94f5c22 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -29,7 +29,7 @@ x2gobroker (0.0.3.0-0x2go1) UNRELEASED; urgency=low
     - Provide a test function that checks if the basic broker agent setup
       (SSH private/public key pair) is available. If not, no SSH broker
       usage will be attempted.
-    - Let an ICMP ping request precede the SSH ping command. This notably
+    - Let a portscan preceed the SSH ping command. This notably
       reduces timeout duration if the host running the queried broker agent
       is down).
     - Catch RequestHandler errors and write them to the error log channel.
@@ -202,7 +202,15 @@ x2gobroker (0.0.3.0-0x2go1) UNRELEASED; urgency=low
     - Enable basic/random load-balancing for UCCS broker frontend. Make UCCS
       frontend aware of host session profile options of the form
       "host=<fqdn> (<ipaddr>:<port>).
-    - Do an ICMP ping before querying a remote agent via SSH.
+    - Do a portscan on the remote's SSH port before querying a remote agent
+      via SSH.
+    - Don't return X2Go Servers that are actually down, currently. The X2Go
+      Servers get probed via a short portscan on the remote's SSH port. If
+      that portscan fails, another remote X2Go Server is chosen from the
+      list of available server (if any). This portscanning functionality
+      can be switched off via "default-portscan-x2goservers" in x2gobroker.conf
+      or via "broker-portscan-x2goservers" per session profile. (Fixes:
+      #692).
   * debian/control:
     + Provide separate bin:package for SSH brokerage: x2gobroker-ssh.
     + Replace LDAP support with session brokerage support in LONG_DESCRIPTION.

Message #65 received at 692@bugs.x2go.org (full text, mbox, reply):

From: X2Go Release Manager <git-admin@x2go.org>

To: 692-submitter@bugs.x2go.org

Cc: control@bugs.x2go.org, 692@bugs.x2go.org

Subject: X2Go issue (in src:x2gobroker) has been marked as closed

Date: Sat, 20 Jun 2015 14:10:27 +0200 (CEST)

close #692
thanks

Hello,

we are very hopeful that X2Go issue #692 reported by you
has been resolved in the new release (0.0.3.0) of the
X2Go source project »src:x2gobroker«.

You can view the complete changelog entry of src:x2gobroker (0.0.3.0)
below, and you can use the following link to view all the code changes
between this and the last release of src:x2gobroker.

    http://code.x2go.org/gitweb?p=x2gobroker.git;a=commitdiff;h=30c316e66f4173d0e3577fe85817e73f822a479e;hp=81e28ea24b269fb24559d70c462b846cf2f56edd

If you feel that the issue has not been resolved satisfyingly, feel
free to reopen this bug report or submit a follow-up report with
further observations described based on the new released version
of src:x2gobroker.

Thanks a lot for contributing to X2Go!!!

light+love
X2Go Git Admin (on behalf of the sender of this mail)

---
X2Go Component: src:x2gobroker
Version: 0.0.3.0-0x2go1
Status: RELEASE
Date: Sat, 20 Jun 2015 13:58:49 +0200
Fixes: 153 217 275 306 360 379 380 447 449 450 469 470 484 491 493 494 544 545 553 562 665 666 685 686 692 706 716 784 834 835 836
Changes: 
 x2gobroker (0.0.3.0-0x2go1) RELEASED; urgency=low
 .
   [ Mike Gabriel ]
   * New upstream version (0.0.3.0):
     - Add SSH support to X2Go Session Broker. (Fixes: #153).
     - Move x2gobroker executable to /usr/bin.
     - Update x2gobroker man page.
     - SSH broker: Only allow context change to another user for the
       magic user (default: x2gobroker).
     - Fix logrotate script: x2gobroker-wsgi. (Fixes: #275).
     - Get the cookie based extra-authentication working for SSH mode.
     - Get the cookie based extra-authentication working for HTTP mode.
     - Fix output of HTTP based connectivity test.
     - Do not let the broker crash if an agent is not reachable. Capture
       X2GoBrokerAgentExceptions when pinging the remote agent. (Fixes: #306).
     - When calling the agent's suspend_session function, make sure to pass
       on the remote_agent dictionary.
     - Provide empty directory /etc/x2go/broker/ssl.
     - Re-order x2gobroker main file. Move logging further to the back to
       allow taking command-line options into account.
     - Modify default x2gobroker-sessionprofiles.conf and provide something
       that will work with every default setup.
     - New broker session profile parameter: broker-agent-query-mode. Define
       agent query methods per session profile.
     - Rename base broker's use_session_autologin to get_session_autologin.
     - Fix Python2'isms in three exceptions. Thanks to Mathias Ewald for
       spotting.
     - Make test_suite callable via setup.py.
     - Provide a test function that checks if the basic broker agent setup
       (SSH private/public key pair) is available. If not, no SSH broker
       usage will be attempted.
     - Let a portscan preceed the SSH ping command. This notably
       reduces timeout duration if the host running the queried broker agent
       is down).
     - Catch RequestHandler errors and write them to the error log channel.
     - Raised verbosity level to INFO for session broker utilities.
     - Add sanity checks to x2gobroker-pubkeyauthorizer.
     - Report stderr results to the broker log channel (broker.log). This
       allows debugging of X2Go Session Broker Agent via the X2Go Session
       Broker logging instance. (Fixes: #217).
     - Fix the ping task in x2gobroker-agent.pl, process it without checking the
       given username.
     - Fix remote agent detection in case of some agents being down.
     - Add utils function: matching_hostnames(): test hostname lists for
       matching hostnames (with/without domain name).
     - Add fuzzy tolerance when comparing host name lists as found in session
       profile configuration and as reported by broker agent.
     - In x2gobroker.conf: describe the manifold ways of providing a second
       authorized_keys file location in SSH server daemon. Thanks to Stefan
       Heitmüller for pointing out more recent SSH server's configuration
       style.
     - WSGI implementation: keep SCRIPT_NAME in environ, as removing it causes
       AssertionErrors whenever we trigger a tornado.web.HTTPError.
     - Add password prompt to x2gobroker-testauth. Password prompt is used
       if the --password option is not used.
     - New authentication mechanism: none. Always authenticate a user, even if
       password is not provided or wrong.
     - Ship python2.6 asyncore patch (Debian squeeze python2.6 version) in
       python-x2gobroker's docs folder.
     - Show correct environment variables in log file prelude when WSGI is used.
     - Fix check-credentials = false for UCCS web frontend.
     - Add a start page (,,It works'').
     - Use IP addresses in apache2 config rather than hostnames.
     - Add new helper tool: x2gobroker-daemon-debug.
     - Add man page for x2gobroker-daemon-debug.
     - WebUI "plain": throw explainative log errors for every 404 http error.
     - Fix man pages (layout issues on x2gobroker-authservice man page).
     - Adapt man page installation to moval of x2gobroker(-testauth) from
       an sbin to a bin directory (executable for any user).
     - Make the inifile broker backend the default backend. (Fixes: #360).
     - Support daemonizing of the http broker.
     - Default to http broker mode when daemonizing the broker.
     - Support daemonizing of the authservice.
     - Detect RUNDIR in x2gobroker-authservice and use it for the default
       location of the authservice socket file.
     - Detect RUNDIR in x2gobroker Python module and use it for the default
       location of the authservice socket file.
     - Let x2gobroker-authservice take care of tidying up its own socket file.
     - Provide PAM config file for Debian and RHEL separately (as they differ).
     - Makefile: Clean up x2gobroker-agent binary.
     - Be more precise in Debian et al. init scripts when checking if the service
       is already running.
     - Add JSON WebUI backend for X2Go Session Broker.
     - JSON WebUI backend renders data of content type "text/json".
     - Provide configuration alternative to having /etc/defaults/* scripts parsed
       in by init scripts. Make X2Go Session Broker ready for being run via
       systemd.
     - Provide symlink x2gobroker-daemon.
     - Provide systemd service files for x2gobroker-daemon and
       x2gobroker-authservice. (Fixes: #379, #380).
     - Add --drop-privileges feature so that x2gobroker-daemon can drop root
       privileges when started via systemd. Only drop privileges if
       x2gobroker(-daemon) is run as uidNumber 0.
     - Implement dynamic authid for JSON WebUI frontend. Add a generic metadata
       top level to the JSON output tree.
     - Store cookies in /var/lib/x2gobroker (path is more appropriate than
       previously suggested path /var/log/x2gobroker).
     - Handle selectsessions calls with a non-existent profile ID gracefully.
     - Session profiles with marker user=BROKER_USER will now auto-fill-in the
       broker username into the session profile's 'user' option.
     - Provide tool: x2gobroker-testagent.
     - Allow for broker clients to send in public SSH keys that the client may
       use for authentication to X2Go Servers.
     - broker agent: avoid one option system() calls in Perl. (Fixes: #784).
     - For user context changes: set the HOME dir of the new user correctly.
     - Reduce Paramiko/SSH verbosity (logging.ERROR) when connecting to remote
       broker agents.
     - Support adding remote broker agent's host keys via the
       x2gobroker-testagent tool.
     - If we received an SSH public key from a broker client, mark it as
       ACCEPTED after we deployed it, so that the client knows that it can
       its corresponding private key.
     - Fix https brokerage in x2gobroker-daemon-debug.
     - Load X2GOBROKER_DAEMON_USER's known_hosts key file before doing
       remote agent calls.
     - Fully rewrite agent.py.
     - Fix broker crashes when no session status is available for certain
       session profiles.
     - JSON webUI: run pre and post auth scripts also via this backend.
     - x2gobroker-daemon: become wrapper script, enable --mode HTTP by default.
       Provide some intelligence when run as daemon (killing children processes
       on reception of a SIGTERM, SIGINT, SIGQUIT, EXIT signal).
     - Rename sections for broker backends in x2gobroker.conf
     - Make config object of x2gobroker.conf available in authentication
       mechanism backends.
     - Fix SSH based broker client.
     - Fix several failing tests, adapt tests to current code base.
     - Introduce new global parameter for x2gobroker.conf: my-cookie-file. Allow
       storing the initial authentication cookie/ID in a read-protected file.
     - Explicitly set detach_process to True when calling daemon.DaemonContext().
       Otherwise the daemons start but don't return to the cmdline prompt.
       (Fixes: #484).
     - Change agent API: all functions return a tuple where the first element
       denotes if the underlying agent call has been successful.
     - Correctly detect $HOME of the user that runs x2gobroker (including setuid
       calls via x2gobroker-ssh).
     - Enforce SSH agent query mode (instead of LOCAL mode) for SSH brokerage (as
       LOCAL query mode won't work due to a permission koan that has not yet been
       solved).
     - Fix interpretation of SSH_CLIENT env variable.
     - Make x2gobroker-agent usable/installable on non-X2Go server machines.
       (Fixes: #493).
     - Provide autologin support for session profiles that have an SSH proxy host
       configured. (Fixes: #494).
     - Fix IPv6 binding of the X2Go Session Broker daemon. If no bind port
       is given via the cmdline, obtain it from other means (via
       x2gobroker.defaults).
     - Rename LICENSE file to COPYING.
     - X2Go Broker Agent: Test if queried username exists on the system before
       performing the query.
     - Make sure bind_address and bind_port are correctly detected from
       /etc/default/x2gobroker-daemon and /etc/x2go/broker/defaults.cfg.
     - Move split_host_address() code into x2gobroker.utils.
     - Report to log what the broker agent replied to us.
     - Provide support for load-balancing to hosts that are all reachable
       over the same IP address, but different TCP/IP ports (e.g. docker
       instances or hosts behind a reverse NATed IPv4 gateway). This ended
       up in a rewrite of the complete selection_session() method of the
       base broker code.
     - Use physical host address and port (if provided) for contacting
       remote broker agent via SSH.
     - Update README and TODO.
     - Update copyright holders. Copyright is held only by people who actually
       contributed to the current code base.
     - logrotate configs: Rotated logs via "su x2gobroker adm".
     - Use hostname as hard-coded in server_list (from session profile
       configuration),
       don't try to strip off the domain name.
     - Consolidate x2gobroker.utils.split_host_address() with a test and rewrite
       completely.
     - Make sure that without configuration files, the HTTP broker listens to
       port 8080.
     - Provide legacy support for deprecated x2gobroker.conf global parameter
       'check-credentials'.
     - Configure broker / authservice environment via .service files.
     - Load defaults.conf via authservices and for logger configuration, as well.
     - x2gobroker-authservice: Make sure socket file directory is created
       before trying to create the socket file itself.
     - Don't load defaults.conf twice. Only load it when initializing the
       loggers.
     - Provide a special PAM configuration file for SUSE systems
       (identical to the PAM configuration file for Debian).
     - defaults.conf: Mention X2GOBROKER_DEBUG not only in the global section,
       but also in the [daemon] and [authservice] section.
     - x2gobroker-testauth: Don't use hard-coded default backend. Obtain
       X2GOBROKER_DEFAULT_BACKEND from x2gobroker.defaults instead.
     - x2gobroker-testauth: Improve help text of --backend option. Display
       the current backend default.
     - x2gobroker-authservice: Restructure logging. Enable log messages
       for authentication requests.
     - Get several issues around select_session fixed via tests in the
       broker's backend base.py.
     - Add tests for broker agent queries.
     - Fix setting the remote agent's SSH port if the host option
       is of style "<hostname> (<ip-address>:<port>)".
     - During select_session: Re-add subdomain (if possible) to the hostname to
       make sure we can detect the host's <ip-address>:<port> further down in
       the code.
     - Properly set (/var)/run/x2gobroker directory permissions when started
       via systemd.
     - Fix privilege check for the broker daemon's log directory.
     - Enable basic/random load-balancing for UCCS broker frontend. Make UCCS
       frontend aware of host session profile options of the form
       "host=<fqdn> (<ipaddr>:<port>).
     - Do a portscan on the remote's SSH port before querying a remote agent
       via SSH.
     - Don't return X2Go Servers that are actually down, currently. The X2Go
       Servers get probed via a short portscan on the remote's SSH port. If
       that portscan fails, another remote X2Go Server is chosen from the
       list of available server (if any). This portscanning functionality
       can be switched off via "default-portscan-x2goservers" in x2gobroker.conf
       or via "broker-portscan-x2goservers" per session profile. (Fixes:
       #692).
     - When load-balancing, switch to chosen server as remote broker agent before
       deploying SSH keys.
     - Allow resuming sessions from servers even if one offline server has
       left bogus in the session DB (plus unit tests).
     - Fix remote agent detection if one ore more X2Go Servers are offline and
       hostname does not match host address (plus unit test).
     - Allow remote agent calls via hostname or host address when using the
       format "<hostname> (<hostaddr>)" in the session profile. This can be
       useful if the <hostname> is a valid address on the local network
       (broker <-> <server> communication), but the host address is valid for
       clients (client <-> server communication).
     - Don't check for running/suspended session if the session profile will
       request a shadowing session.
     - Disabled broker agent calls and load-balancing for session profiles that
       will request shadowing sessions.
     - Mention "usebrokerpass" session profile option in
       x2gobroker-sessionprofiles.conf.
     - Provide desktop sharing (shadow session) example in
       x2gobroker-sessionprofiles.conf.
     - Makefile: Add installation rules for x2gobroker-loadchecker.
     - x2gobroker.1: Since systemd there are not only init scripts. Rephrasing
       man page.
     - New feature: x2gobroker-loadchecker daemon. (Fixes: #686).
     - x2gobroker-agent.pl: Use var name server_usage instead of server_load.
       Reflects better what that var denotes.
     - agent.py: Completion of several __doc__ strings (missing @return:,
       @rtype: fields).
     - X2GoBroker.check_for_sessions(): Fix check for shadow / non-shadow
       sessions.
     - x2gobroker.1: Mention x2gobroker-ssh in its man page, differentiate
       between the different modes (http/ssh) of the x2gobroker application.
     - Pre-release pyflakes cleanup.
     - agent.py: Capture login failures in checkload() function.
     - agent.py: Allow providing a custom logger instance in all functions.
     - LoadChecker.loadchecker(): Use load checker daemon's logger instance
       for logging actions taken place in agent.py.
     - agent.py: Make agent query mode LOCAL behave similar to agent query mode
       SSH if things go wrong.
     - agent.py: Set result to None, if SSH connection to broker agent fails.
     - Calculate our own MemAvailable value in x2gobroker-agent.pl. Only
       kernels newer than v3.14 offer the MemAvailable: field in /proc/meminfo.
     - x2gobroker-agent.pl: Fix regexp for detecting number of CPUs and CPU
       frequency.
     - x2gobroker-agent.pl: Fall-back CPU detection for virtualized systems (e.g.
       QEMU hosts).
     - LoadChecker.loadchecker(): Report about query failures, as well, in query
       cycle summary.
     - LoadCheckerServiceHandler(): Add line breaks in per-profile output.
       Return nothing if the load checker service is unreachable.
     - agent.py: Let get_servers() return a dictionary with hostnames as keys
       and number of sessions as values.
     - Fix X2GoBroker.use_load_checker(): Obtain broker-* option via
       X2GoBroker.get_profile_broker(), not via X2GoBroker.get_profile().
     - Various improvements / fixes for session selection via the load checker
       daemon.
     - Adapt tests to new load checker service feature.
     - Only check for 'load_factors' key in remote_agent dict, if agent query
       mode is SSH.
     - Fix detection of running x2gobroker-daemon process in Debian's SystemV
       init script.
     - Set default log level to "WARNING", not "DEBUG".
     - defaults/x2gobroker-logchecker.default: Fix copy+paste errors.
     - doc/README.x2goclient+broker.getting-started: Mention how to launch
        PyHoca-GUI in broker mode.
     - etc/broker/defaults.conf: Fix copy+paste errors.
     - etc/x2gobroker-wsgi.*.conf: Make host ACLs Apache2.4 compliant.
     - logrotate/x2gobroker-loadchecker: The loadchecker.log file needs to be
       owned by user x2gobroker.
     - rpm/x2gobroker-*.init: Fix copy+paste errors.
     - man pages: Update date.
     - If non-load-balanced session profiles reference a non-reachable host,
       hand-back the system's hostname to X2Go Client / Python X2Go.
     - Add security notice / disclaimer to x2gbroker.1 man page as suggested
       by Stefan Baur. (Fixes: #666).
     - Provide x2gobroker system user public keys to broker agents with SSH
       options--strongly restricting the key usage--now. Modify x2gobroker-
       pubkeyauthorizer in a way that it replaces non-option keys with the
       newly provided optionized/restricted pubkeys. (Fixes: #685).
     - etc/x2gobroker.conf: Switch over to using dynamic auth cookies by default.
     - X2GoBroker.get_agent_query_mode(): Immediately return overridden query
       mode. Avoid logging of the configured query mode. Write the overridden
       query mode to the logger instance instead.
     - Don't enforce agent query mode "SSH" for x2gobroker-ssh anymore.
     - If a single-host is unreachable, return the host address, not the hostname
       and let X2Go Client release itself, that the host is unreachable.
     - x2gobroker-loadchecker: Don't freeze if load information for a complete
       load-balanced server farm is unavailable.
     - x2gobroker-pubkeyauthorizer: Handle replacement of SSH pubkeys with wrong/
       old SSH options.
     - x2gobroker-agent.pl: Add %U (uidNumber) and %G (primary gidNumber) as
       further possible substitutions for deriving the full path of the
       authorized_keys file where X2Go Broker Agent's deploys public SSH user
       keys to. (Fixes: #665).
     - agent.py: Use os.fork() instead of threading.Thread() to handle
       delayed executions of broker agent tasks. This assures that SSH pub keys
       are removed via the delauthkey broker agent task, if the SSH broker
       is used. (Fixes: #491).
     - Add run-optional-script support to SSH broker.
     - x2gobroker-ssh: When agent query mode is set to LOCAL, Execute
       x2gobroker-agent via sudo as group "X2GOBROKER_DAEMON_GROUP". (Fixes:
       #835).
     - When the x2gobroker-agent command call is shipped via
       $SSH_ORIGINAL_COMMAND environment var, make sure to strip-off
       "sh -c" from the command's beginning.
     - x2gobroker-agent.pl: Fix detection of X2Go's library path (x2gopath lib).
     - Implement "not-set" value for X2Go Client parameters. If a parameter
       is set to "not-set", the parameter won't be handed over to X2Go Client.
       (Fixes: #834, #836).
     - agent.py: Fix missing "task" parameter for task "ping" against a local
       broker agent.
     - Fix task ping when tested via the x2gobroker-testagent script.
     - Transliterate commands in session profiles to uppercase when checking if
       the command is supposed to launch a desktop session.
   * debian/control:
     + Provide separate bin:package for SSH brokerage: x2gobroker-ssh.
     + Replace LDAP support with session brokerage support in LONG_DESCRIPTION.
     + Fix SYNOPSIS texts.
     + Recommend apache2 and libapache2-mod-wsgi for x2gobroker-wsgi.
     + Fix position of XS-Python-Version: field.
     + Rework LONG_DESCRIPTION of bin:package x2gobroker-agent. Imporve line
       breaks, so that we now have lines that are close to 80 chars long.
     + Make x2gobroker-daemon a symlink and recognize HTTP mode by the
       executable's name.
     + Bump Standards: to 3.9.6. No changes needed.
     + Add to D (python-x2gobroker): python-urllib3.
   * debian/copyright:
     + Update file to match current status quo of upstream source files.
   * debian/x2gobroker-agent.dirs:
     + Provide empty log file directory.
   * debian/x2gobroker-wsgi postinst/postrm:
     + Make bin:package x2gobroker-wsgi compliant Debian's packaging style of
       Apache2.4 / Apache2.2.
     + On package purgal: Disable Apache2 config first and then attempt the
       removal of the x2gobroker user/group.
     + Pass $@ to our apacheconf_configure, apacheconf_remove functions to not
       break apache2-maintscript-helper.
   * debian/x2gobroker-ssh.postinst:
     + Assure proper file permissions, owner and group settings for
       x2gobroker-ssh.
   * debian/x2gobroker-ssh.prerm:
     + Drop dpkg-statoverride of /usr/bin/x2gobroker-ssh before package
       removal.
   * debian/*.postinst:
     + Assure that the log directory always exists (no matter what combination
       of packages got installed).
   * debian/python-x2gobroker.install:
     + Install defaults.conf into bin:package python-x2gobroker.
   * debian/source/format:
     + Switch to format 1.0.
   * rpm/*.init:
     + Provide initscripts that are likely to work on RHEL plus derivatives.
   * x2gobroker.spec:
     + Provide x2gobroker.spec file for building RPM packages. Inspired by
       the packaging work in OpenSuSE.
     + Split out python-x2gobroker sub-package.
     + Install Apache2 config symlinks to /etc/httpd (not /etc/apache2).
     + Make sure x2gobroker-agent wrapper gets installed into x2gobroker-agent
       sub-package.
     + Builds for EPEL-7 also have to systemd aware.
     + Provide separate bin:package for SSH brokerage: x2gobroker-ssh.
     + Adapt to building on openSUSE/SLES.
     + Rework Description: of bin:package x2gobroker-agent. Imporve line
       breaks, so that we now have lines that are close to 80 chars long.
     + Add x2gobroker-rpmlintrc file.
     + Don't package x2gobroker-daemon.1 nor x2gobroker-ssh.1 man pages
       twice.
     + On SUSE, we have /etc/apache2, not /etc/httpd.
     + On SUSE, we have to provide our own python-pampy package (and depend on
       that). In Fedora and RHEL, the same (upstream) software is named
       python-pam. (Fixes: #562).
     + For distro versions with systemd, provide /etc/x2go/broker/defaults.conf.
       For SysV distro versions, use /etc/defaults/* and source them via the
       init scripts.
     + No adm group on non-Debian systems by default. Using root instead on RPM
       based systems.
     + For Fedora 22 and beyond explicitly call python2 in all shebangs.
     + Add to BR: sudo (to have /etc/sudoers.d owned by some package).
 .
   [ Josh Lukens ]
   * New upstream version (0.0.3.0):
     - Add support for dynamic cookie based auth after initial password auth.
       (Fixes: #447).
     - Add support to run pre and post authentication scripts. (Fixes: #449).
     - Add auth mechanism https_get. (Fixes: #450).
     - Change pre and post scripts to use common codebase across frontends.
       (Fixes: #469).
     - Add ability to have script run in select session after server is
       selected.
     - Add basic support for pulling https_get authmech config from
       configuration file. (Fixes: #470).
     - Fix typos and host/port mixups in the remote_sshproxy logic. (Fixes:
       #544).
     - Make sure find_busy_servers in agent.py returns a tuple (recent API
       change) to not break profiles with multiple servers. (Fixes: #545).
     - On session resumption take profile's host list into account. Don't resume
       sessions the profile has not been configured for. (Fixes: #553).
 .
   [ Jason Alavaliant ]
   * New upstream version (0.0.3.0):
     - Handle spaces in broker login passwords when authservice is used. (Fixes:
       #706).
     - Don't strip off spaces from password strings. (Fixes: #716).
 .
   [ Mihai Moldovan ]
   * x2gobroker.spec:
     + Change all python-pampy references to python-pam on non-SUSE systems.
     + Fix %build scriptlet: add missing "done" in while; do; done shell script
       part.
     + Don't do a weird escape slash dance in sed's replace command. Simply use
       another separator.
   * debian/rules:
     + Try to call common-binary-indep from common-binary-arch.

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