Setting up SSO with CAS and LDAP

This post provides a tutorial on how to set up SSO functionality by using CAS and LDAP authentication as a backend server. This setup aims on authenticating webservices via CAS which will provide Single Sign On using LDAP user credentials. We make use of the great Zentyal derivative of Ubuntu, which makes configuration really comfortable as it handles all major complex tasks (Squid hurts a little, bind hurts a lot) by configuring modules on a neat GUI accessible from any browser.

Well, maybe not any browser – we haven’t ever tested firing up the GUI on Internet Explorer but being able to configure complex server layouts and using IE is an oxymoron.

We love Ruby. We love CAS. A lot. We’ve examined many different SSO services, but CAS is one of the most mature solutions plus it is enterprise scalable. While CAS is enterprise ready, it is not yet doomed to be bloated or of heavy weight, as making use of RubyCAS still establishes a vital and light weight implementation.


The gateway system is a Zentyal 3.2 server based upon Ubuntu 12.04. We aren’t too fond of cutting edge systems which are most likely to break whenever possible, so the 3.2 release was our latest stable experience. We call this guy zentyal throughout this tutorial and assign the internal IP

The deployment system is an Ubuntu Server 14.04 which hosts different instances of webservices like ownCloud, Redmine, Github, Question2Answer, Drupal and many more. Slapd provides LDAP, RubyCAS (which we have forked ‘n’ fixed) provides CAS. The name of this big boy in this tutorial is devserver and lives at

For RubyCAS we of course need Ruby on our system, so we compiled 2.1.1 from source. Jump to the last paragraph to read what you have to do in order overcome the compile errors, it is a rather simple fix but hard to find on the internet. Just to mention, RubyCAS is a Rack application, not a Rails application. You’ll also need php-cas installed for many applications, we’ll post another entry which incorporates all the different readmes and config options, please be patient until we’re done. Meanwhile you could go to our GitHub Page for finding out more.

We chose PostgreSQL as our database as we always do. You can go with MySQL as well but we don’t recommend doing so. When you decide to implement an SSO solution you’ll most likely manage a larger user base which directly translate to lots of data sets. Use Postgres, elephants are much cooler than dolphins.


Installation and configuration

We have split our environment’s configuration apart into the configuration of the so called ‘devserver’ (CAS & Apache) and the Zentyal Gateway/DNS (Apache with ReverseProxy config).


Our configuration heavily differs from standards, as we run our webservices – including Apache – from the /srv directory. The /srv directory incorporates separate /etc and /var subdirectories so we can run different configuration sets for expirmental purpose. Not the config per se is experimental but what we do with our environment. Simply translate /srv/cas/var/www to /var/www so it fits to your environment.

Devserver CAS Configuration

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To install CAS clone the git repo into /srv/ directory (see paragraph above – use /var/www if you do not like to follow our structure).
# if the directory doesn't exist: create it
cd /srv/cas/var/www/
sudo git clone
sudo mv rubycas-server cas
cd cas
sudo cp config/config.example.yml config.yml

Of course you can clone our repository which you can find on our GitHub page.

Now we have to modify the config.yml to fit our needs for authenticating against LDAP. There is no need for creating an ssl_cert since the CAS-server is hosted in a trusted network. Connections are only allowed from our Zentyal-server.

The following config file summarises all the essential options:


server: webrick #RubyCAS comes with WebRICK but we'll provide a Passenger config later
port: 444
uri_path: /cas
  adapter: postgresql
  database: cas_server
  username: cas
  password: 'SWORDFISH'
  reconnect: true
  class: CASServer::Authenticators::LDAP
    port: 390 # could be 389 in your case
    base: 'ou=Users,dc=yourserver,dc=com'
    username_attribute: uid
    filter: '(memberof=cn=__USERS__,ou=Groups,dc=yourserver,dc=com)'
    auth_user: 'cn=zentyalro,dc=yourserver,dc=com'
    auth_password: 'somecrypto'
extra_attributes: cn, mail, givenName, sn, dn
theme: simple
infoline: Single-Sign-On by Leonis
organization: Leonis # your_org
  file: /var/log/casserver.log
  level: DEBUG

Our configuration stores live data into the postgres database cas_server. This database has to be created in the first place! Also be aware that in our case the database is provided by ( and has to be created there.

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[email protected]:~$ sudo -u postgres createuser cas
[email protected]:~$ sudo -u postgres createdb -O cas cas_server # crate DB and assign to user

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bundle install # ignore the yellow warning for now

and fix any further missing dependencies (can vary from version to version).

Start the CAS server by using (or see Appendix for init-script)

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sudo bundle exec rubycas-server -c config.yml

Devserver (CAS-Server) Apache Configuration

Create /etc/apache2/sites-available/cas.conf


#<VirtualHost *:80> # you read right – uncomment this line
      PassengerMinInstances 3 # let Passenger do more than one instance
      <Directory /srv/shared/var/www/cas>
        AllowOverride all
        RailsBaseURI /cas
        PassengerAppRoot /srv/cas/var/www/casrails
        PassengerResolveSymlinksInDocumentRoot on
         # MultiViews must be turned off.
         Options -MultiViews
#</VirtualHost> # that one needs a sharp too

As our devserver runs Ubuntu 14.04 with Apache 2.4 we do not have to specify the suffix .conf for our vHost but we don’t want to confuse people. There are many, many servers out there running Ubuntu 12.04 – we are better safe than sorry.
Most important here: You do not want to create a separate vHost but only a separate file for a directory. There is no need to create any hassle, Passenger is sensitive so don’t hurt its feelings.

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sudo a2ensite cas.conf

Make sure to have set up all your directory entries in sites-available/default correctly and /cas/ is reachable.

Gateway / Webserver (Zentyal)

Configuring the reverse proxy is simply done by adding entries to your Apache configuration when mod_proxy is enabled. Let’s first enable these mods by applying:

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sudo a2enmod proxy
sudo a2enmod proxy_html
sudo a2enmod proxy_http

You need to reload and restart Apache after enabling the mods. Next we are going to add the necessary entries to our vHosts, first default (or 000-default):


ProxyPass /cas

As we prefer to take a walk on the SSL-side here goes default-ssl


ProxyPass /cas

and moreover these entries go to both:

ProxyRequests Off
ProxyPreserveHost On

<Proxy *>
      Order deny,allow
      Allow from all

For God’s sake do not miss that one. If you do forget about that we wish you happy times with not being able to reach Google since bot nets are going to heavily abuse your reverse proxy. We have a solid configuration for Fail2Ban and DenyHosts, please feel free to contact us.



During the setup of the environment we have found and eliminated some pitfalls.

Extra-attributes provided by LDAP

The „extra-attributes“ setting for rubycas seems to work fine, but the XML conversion was also a little bit buggy when trying to talk to RubyCAS using the phpCAS-Library. We achieved creating a workaround which solved the problem of leading “——” and whitespaces in the extra attributes by changing the XML builder method in lib/casserver/server.rb.
Instead of .to_yaml the CDATA is now converted into a string-(array with one element), which will now give you the exact clean value of the extra-attributes.



builder.cdata! value.to_yaml



builder.cdata! value.first.to_s

Use CAS’ extra-attributes instead of LDAP directly

CAS has a wonderful syntax and can provide LDAP attributes on its own to application servers. Instead of populating the user databases of the app-servers via LDAP directly, CAS can be used as an interface between them and provide additional data to users stored in the directory. The extra attributes can be used for creating users in the local databases. If application servers talk to LDAP and CAS simultaneously, unexpected results may occur.

SSL Certificate Issue for rubyCAS

In our environment a certificate for rubyCAS is not absolutely necessary since the connection between clients from the internet and Zentyal is already encrypted and CAS only communicates in a trusted LAN. Therefore – for now – no SSL encryption for providing (CAS-)tickets has been enabled.
It also seems like CAS may have some issues with the reverse proxy and the domain name when trying to use and validate the certificate. Further investigation will be necessary to use it productively. We will assign Jacques CacheFleau to dive deeper into this matter.

Init-script for rubycas

Save this file to /etc/init.d/rubycas and do a

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sudo chmod +x /etc/init.d/rubycas

After that you can simply run

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sudo service rubycas start|stop|restart

to manage the server.



function isRunning {
  PID=`sudo netstat -pantlu | grep 444 | awk ' { print $7 } ' | cut -d"/" -f1 | head -n 1`
  if [ "$PID" != "-" ] && [ "$PID" != "" ]
    if [ "$PID" -gt "0" ]
      return 0
      return 1
    return 1

function shutdown_cas {
  if isRunning
    echo -n "Shutting down rubycas…"
    sudo kill $PID
    echo "done."
    echo "rubycas not running mumble mumble"

function start_cas {
  if isRunning
    echo "rubycas already running mumble mumble"
    echo -n "Starting rubycas…"
    cd /srv/cas/var/www/casrails
    bundle exec rubycas-server -c /srv/cas/var/www/casrails/config.yml &> /srv/cas/var/www/casrails/current_output.log &
    echo "done."

case "$1" in


    if isRunning
      echo "Detected running RubyCAS"
      sleep 3s

    echo $"Usage: $0 {start|stop|restart}"
    exit 1

Hint: Watch out for the proper directories! Replace /srv/cas/var/www with your configuration accordingly. Also when cloning rubycas do not miss to create a symlink to your /public directory inside the cas directory. In our case, we renamed the cas directory to casrails.

Compiling Ruby 2.1.1 properly

Hint: User a newer Ruby version now! This is outdated, yet you get the idea of what to do.

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sudo apt-get install autoconf automake bison build-essential curl git git-core libc6-dev libreadline6 libreadline6-dev libreadline6-dev libssl-dev libsqlite3-dev libtool libxml2-dev libxslt-dev libxslt1-dev libyaml-dev ncurses-dev openssl sqlite3 zlib1g zlib1g-dev

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tar -xzvf ruby-2.1.1.tar.gz
cd ruby-2.1.1/

If you continue compiling you will see:


# man, this truly sucks
readline.c: In function ‘Init_readline’:
readline.c:1977:26: error: ‘Function’ undeclared (first use in this function)
     rl_pre_input_hook = (Function *)readline_pre_input_hook;
readline.c:1977:26: note: each undeclared identifier is reported only once for each function it appears in
readline.c:1977:36: error: expected expression before ‘)’ token
     rl_pre_input_hook = (Function *)readline_pre_input_hook;
readline.c: At top level:
readline.c:634:1: warning: ‘readline_pre_input_hook’ defined but not used [-Wunused-function]

So we fix this quickly by replacing a line:

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cd ext/readline/
sudo nano readline.c

CTRL+W # search for rl_pre_input_hook = (Function *)readline_pre_input_hook;

# delete this line
CTRL+SHIFT+V # replace with rl_pre_input_hook = (rl_hook_func_t *)readline_pre_input_hook;

Save, exit and continue:

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sudo make install
ruby -v # Victory! All your gem is now belong to us.

Protip: Real men use checkinstall.


Since you are using Zentyal why not Kerberos?

Why not Zoidberg? Kerberos is kool but some webservices are just not capable of handling that beast.

Will it work with my webservices? And whom to complain to if it doesn’t work?

We are the maintainers of the ownCloud user_cas plugin and of the Question2Answer qa-external-cas plugin. You can file bug reports on GitHub or contact us here. We’re also working on the rubycas-server itself plus know how to work with the Redmine CAS plugin.
If you would like us to set up your environment simply let us know.

Seriously, why this /srv/cas thingy?

As already mentioned we have a special taste of unbreakable stuff, so we love to keep our applications separated from each other. Also we are great fans of keeping our configs tracked by Git. We have a GitLab instance up and running, also residing in /srv/ where’s no need to mess with directory permissions and keeping them secure so that Apache (…) and so on and so on.

Oh, this /srv thingy doesn’t sound stupid, can you tell me more about it?

Of course! We are working on an automatic installer for one-command installation with dependency check and live updates. For now we are hosting it at our GitLab but well publish it to GitHub and Launchpad (later on). We even have already agreed on the command which will be ‘leonis-install’. You read right, it’s because of the Lion’s Pride to call it that way. Funny pun, don’t you think?

OK, never mind.

If you have any questions feel free to contact us anytime. If you find it was a good read you are very welcome to hit one of these sharing buttons below the text. We appreciate that a lot!

Christopher Semmler's picture

Christopher Semmler

Christopher Semmler is our CEO and works in our IT and Finance Division. Apart from Business Development he makes technology decisions, works on platforms and Digital Marketing. He holds a Magister degree in Corporate Finance and Information Systems, loves to play with new tech and is specialised in the low level area.


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  1. شركة نقل عفش بتبوك's picture
    شركة نقل عفش بتبوك (not verified)

    دار السلام اهم شركة نقل عفش بالطائف وكذلك اهم شركة نقل عفش بمكة وجدة والمدينة المنورة تقوم الشركة بنقل العفش بحفر الباطن وتبوك وجازان وتقوم بنقل الاثاث بالقصيم شركة نقل عفش بالطائف شركة نقل عفش بالمدينة المنورة شركة نقل عفش بجازان وابها شركة نقل عفش بجدة شركة نقل عفش بالقصيم شركة نقل عفش بتبوك شركة نقل عفش بحفر الباطن افضل شركة نقل عفش بجدة شركة الاطلال شركة نقل اثاث بجدة شركة متخصصة فى نقل اثاث بجدة على اعلى مستوى من نقل العفش بجدة شركة نقل عفش بجدة

  1. شركة نقل اثاث بالدمام's picture
    شركة نقل اثاث ب... (not verified)

    الشرق الاوسط افضل شركة نقل عفش بالدمام شركة نقل عفش بالخبر شركة نقل عفش بالجبيل شركة نقل عفش بالقطيف تنظيف كنب بالدمام تنظيف كنب بالخبر شركة نقل اثاث بالدمام نقل عفش بالدمام شركة نقل عفش بالخبر شركة نقل العفش بالخبر نقل العفش بالدمام شركة نقل عفش بالجبيل شركات نقل العفش بالدمام والخبر

  1. نقل اثاث بالرياض's picture
    نقل اثاث بالرياض (not verified) شركات نقل العفش اهم شركات كشف تسربات المياه بالدمام كذلك معرض اهم شركة مكافحة حشرات بالدمام والخبر والجبيل والخبر والاحساء والقطيف كذكل شركة تنظيف خزانات بجدة وتنظيف بجدة ومكافحة الحشرات بالخبر وكشف تسربات المياه بالجبيل والقطيف والخبر والدمام شركة تنظيف خزانات بجدة شركة كشف تسربات المياه بالدمام شركة مكافحة حشرات بالدمام شركة تنظيف خزانات بجدة شركة نقل عفش واثاث شركة نقل اثاث بالرياض شركة نقل عفش بجدة شركة نقل عفش بالدمام شركة نقل عفش بالمدينة المنورة شركة نقل عفش بالطائف شركة نقل عفش بمكة اهم شركات نقل العفش والاثاث بالدمام والخبر والجبيل اولقطيف والاحساء والرياض وجدة ومكة المدينة المنورة والخرج والطائف وخميس مشيط وبجدة افضل شركة نقل عفش بجدة نعرضها مجموعة الفا لنقل العفش بمكة والخرج والقصيم والطائف وتبوك وخميس مشيط ونجران وجيزان وبريدة والمدينة المنورة وينبع افضل شركات نقل الاثاث بالجبيل والطائف وخميس مشيط وبريدة وعنيزو وابها ونجران المدينة وينبع تبوك والقصيم الخرج حفر الباطن والظهران شركة نقل عفش بينبع شركة نقل عفش ببريدة شركة نقل عفش بالخرج شركة نقل عفش بالقصيم شركة نقل عفش بخميس مشيط شركة نقل عفش بتبوك شركة نقل عفش بابها شركة نقل عفش بنجران شركة نقل عفش بحائل شركة نقل عفش بالظهران شركة نقل عفش بالكويت

  1. نقل عفش بمكة's picture
    نقل عفش بمكة (not verified) نقل الاثاث شركة نقل عفش بالرياض شركة نقل عفش بجدة شركة نقل عفش بالدمام شركة نقل عفش بالمدينة المنورة شركة نقل عفش بالطائف شركة نقل عفش بمكة شركة نقل عفش بينبع شركة نقل عفش بنجران شركة نقل عفش بخميس مشيط شركة نقل عفش بابها شركة نقل عفش ببريدة شركة نقل عفش بالقصيم شركة نقل عفش بتبوك شركة نقل عفش بحائل شركة نقل عفش بالخبر شركة نقل عفش بالاحساء شركة نقل عفش بالقطيف شركة نقل عفش بالجبيل نقل عفش بحفر الباطن اسعار شركات نقل العفش بمكة نقل اثاث بمكة 2017 كيفية نقل العفش بمكة اهم شركات نقل العفش بمكة افضل شركة نقل عفش بمكة اسعار شركات نقل العفش بجدة نقل اثاث بجدة 2017 كيفية نقل العفش بجدة اهم شركات نقل العفش بجدة افضل شركة نقل عفش بجدة اسعار شركات نقل العفش بينبع نقل اثاث بينبع 2017 كيفية نقل العفش بينبع اهم شركات نقل العفش بينبع افضل شركة نقل عفش بينبع اسعار شركات نقل العفش بالمدينة المنورة نقل اثاث بالمدينة المنورة 2017 كيفية نقل العفش بالمدينة المنورة اهم شركات نقل العفش بالمدينة المنورة افضل شركة نقل عفش بالمدينة المنورة اسعار شركات نقل العفش بالرياض نقل اثاث بالرياض 2017 كيفية نقل العفش بالرياض اهم شركات نقل العفش بالرياض افضل شركة نقل عفش بالرياض

  1. نقل عفش بجدة's picture
    نقل عفش بجدة (not verified) اسعار شركات نقل العفش بالطائف نقل اثاث بالطائف 2017 كيفية نقل العفش بالطائف اهم شركات نقل العفش بالطائف افضل شركة نقل عفش بالطائف اسعار شركات نقل العفش بالدمام نقل اثاث بالدمام 2017 كيفية نقل العفش بالدمام اهم شركات نقل العفش بالدمام افضل شركة نقل عفش بالدمام اسعار شركات نقل العفش بالقصيم نقل اثاث بالقصيم 2017 كيفية نقل العفش بالقصيم اهم شركات نقل العفش بالقصيم افضل شركة نقل عفش بالقصيم اسعار شركات نقل العفش بابها نقل اثاث بابها 2017 كيفية نقل العفش بابها اهم شركات نقل العفش بابها افضل شركة نقل عفش بابها شركة تنظيف خزانات بالمدينة المنورة كيف يتم تنظيف الخزانات بالمدينة المنورة اسعار يتم تنظيف خزانات بالمدينة المنورة شركات تنظيف خزانات بالمدينة المنورة 2017 اهم شركات تنظيف خزانات بالمدينة المنورة

  1. مكافحة حشرات بينبع's picture
    مكافحة حشرات بينبع (not verified)

    شركة مكافحة حشرات بينبع وكذلك شركة كشف تسربات المياه بينبع وتنظيف خزانات وتنظيف الموكيت والسجاد والكنب والشقق والمنازل بينبع وتنظيف الخزانات بينبع وتنظيف المساجد بينبع شركة تنظيف بينبع تنظيف المسابح بينبع شركة مكافحة حشرات بينبع شركة كشف تسربات بينبع شركة عزل اسطح بينبع شركة تسليك مجاري بينبع شركة تنظيف كنب بينبع شركة تنظيف مساجد بينبع شركة تنظيف سجاد بينبع شركة تنظيف خزانات بينبع شركة تنظيف وصيانة مسابح بينبع شركة تنظيف الاثاث بينبع شركة تنظيف شقق بينبع شركة تنظيف موكيت بينبع شركة تنظيف مجالس بينبع شركة تنظيف منازل بينبع شركة تنظيف فلل بينبع شركة تنظيف ستائر بينبع شركة جلي بلاط بينبع

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