Zentyal Desktop

Warning: please note that if you don't follow this how-to step by step or if something goes wrong you can lock yourself out. So please, use a virtual machine or a spare machine to try it

Introduction

zentyal-desktop is a Ubuntu package intended to be installed on the desktop clients (workstations) of a network managed by Zentyal Server.

It provides two main features:

• Authentication against Zentyal LDAP: The user database is stored only on the Zentyal server and if you have an account on it you can login from any machine on the network. This works exactly as the PDC feature for Windows clients, but in this case with Ubuntu clients.
• Auto-configuration of desktop clients for the services provided by Zentyal (mail, samba, Jabber, VoIP, ...): The first time the user logs in a machine it creates a home directory with the proper preconfigured settings.

Configured Applications

Here is a list of the applications included with Ubuntu Desktop that are automatically configured by zentyal-desktop:

• Evolution (Mail service): The mail account of the user is read from LDAP and added.
• Nautilus (File sharing): Links to the samba user share and all group shares for the user are added on the desktop.
• Ekiga (VoIP): The asterisk account for the user is added. A workaround is needed to ask the user for the password before start Ekiga the first time because it can't do it if it isn't specified in the configuration.
• Pidgin (Jabber service): The jabber account of the user (if it has one) is added. It also adds a conference to its buddy list for each group that the user belongs to.
• Firefox (Zarafa & User corner): Links to these two services are added to the bookmarks toolbar. Currently it only works if the user corner port is the default one (8888).

Required Scenario

• Zentyal Server 2.0.
• At least one client machine with either Ubuntu 10.04 (Lucid) or 10.10 (Maverick) installed.

Upcoming Features

• Roaming profiles

Changes on Server Side to Make it Work

General Changes

• Make sure that you have the Users and Groups module installed, if not you can install it by apt-get install ebox-usersandgorups or using the Software Management menu on the Zentyal interface.
• If you have the Firewall module enabled, go to Firewall --> Packet Filter --> Filtering rules from internal networks to Zentyal and change the decision for ldap service from DENY to ACCEPT.
• Set a valid shell like 'bash' in "Users and Groups -> LDAP Settings"
• The above change will only affect the users we create from now on.
• Enable Users and Groups Module and click on Save Changes.
• Create a user from the Users/Add? User menu on the Zentyal interface.

Jabber Service

• Make sure you have the SSL support option on the Zentyal Jabber configuration set to Allow SSL or Force SSL. That's because pidgin is configured by default to use SSL.
• Check the option Enable MUC (Multi User Chat) if you want to use conferences for the groups on your system.
• The Domain name must be set to the same value as your LDAP Base DN. You can check it at "Users and Groups -> LDAP Settings". For example, if your Base DN is "dc=example,dc=com" your Jabber Domain has to be "example.com". By default both LDAP Base DN and Jabber Domain has the same value (the hostname of your machine). So, if you haven't changed them, you don't have to do anything.

• The client needs also to be capable of resolve the Domain name to the Zentyal Server IP address. This won't be a problem if your clients get the DNS configuration from the Zentyal DHCP Server and you have added that domain.
• The users that you create must have enabled the Jabber Account section in the Users/Edit? User menu of Zentyal. You can see the image below.

Mail Service

• You need to have a virtual mail domain created (probably you already entered it in the initial configuration wizard).
• The users should have a mail account created (as shown in the last image of the Jabber service section).
• You can enable the mail retrieval services you want in the Mail/General? menu on eBox. But they have to be according to the /etc/zentyal-desktop/zentyal-desktop.conf file.
• The default values on that file are to use IMAP instead of POP and use SSL when available.

Client Side

Installation:

• A zentyal-desktop package is provided. Note that this is not yet a stable release, so you use it at your own risk. If you don't know what you are doing and you install it in your production machine it might lock you out.
• Add one of the following lines to your /etc/apt/sources.list file:
  • If you are using Ubuntu 10.04: deb  http://ppa.launchpad.net/zentyal/desktop/ubuntu lucid main
  • If you are using Ubuntu 10.10: deb  http://ppa.launchpad.net/zentyal/desktop/ubuntu maverick main
• apt-get update && apt-get install zentyal-desktop
• The installation process will ask for the address of the Zentyal Server. You can ignore all the previous questions about LDAP.
• Probably you will need to reboot the desktop machine after the installation to avoid some issues.
• Once the package is installed, you can change this address executing dpkg-reconfigure zentyal-desktop.

Usage:

• Login with any user created in the Zentyal Server after the setup and check that the desktop programs are configured for the Zentyal Services.

• After entering the username and a password you'll see a warning about recently created directories if this is the first time the user logs in.
• If you want to force a reconfiguration you can do it executing rm ~/.zentyal-desktop-configured and then login again.

Here is an example desktop after login and running pidgin. Pidgin asks directly for the password without needing to configure the account. You can also see a link on the desktop to the user's personal Samba Share.

Another example of the same user belonging to two new groups with Samba Share enabled and running firefox with the Zentyal user corner login screen.

How it Works

• It uses pam_ldap.so PAM module (libpam-ldap package) for the remote authentication.
• The configuration of the user home directory is done by a script located at /usr/share/zentyal-desktop/zentyal-setup-user that is ran after login has succeeded.
• There is a /usr/share/zentyal-desktop/skel directory that contains templates for some of the configured applications.
• The zentyal-setup-user script gets different needed values from LDAP (connecting to the Zentyal server) and replaces them on the templates.
• It creates a .zentyal-desktop-configured file on the user home to avoid repeating the process after each login.
• zentyal-setup-user is ran (using pam_exec.so) as root user, so it adds some actions to the ~/.profile in order to be ran as the login user (some of them are other auxiliary scripts located in /usr/share/zentyal-desktop).