Some months ago, I started to play around with OpenLDAP and Kerberos. At the beginning of my LDAP adventure, I often messed up my installation, so I ended up reinstalling everything and had to start again from scratch.

To make my life a little bit easier, I wrote a simple bash script to do the package installing in order to make the necessary changes to the config files only to the last ‘save’ point. Over the time, I added a lot of stuff and features and so the script started to accumulate. In retrospect, if I started again from the beginning, I would now use something more appropriated than bash.

Anyway, the script installs a “Multi-Master Kerberos Server with a LDAP Backend”.

Please follow the steps to try out the script on a current ubuntu or debian system (ubuntu 17.10 or debian 8). I would recommend to use a fresh system in a virtual machine.

There are some more things I will explain in further posts, once I will have the time which I do not have currently. Soooo, if you have specific questions about the script or ideas for improvement, please leave me a comment.

Disclaimer: Feel free to use this script at your own charge, I cannot be held responsible for what YOU do on YOUR administered system.

1. Download the two files:
   • LDAPX-0.18.4.tar.gz
   • LDAPX-0.18.4.tar.gz.md5
2. Use md5 to check the data integrity of the downloaded file:
   user@yourbox:~$ md5sum -c LDAPX-0.18.4.tar.gz.md5
3. Extract the file with tar:
   user@yourbox:~$ tar -zxvf LDAPX-0.18.4.tar.gz
4. Change in the directory LDAPX:
   user@yourbox:~$ cd LDAPX
5. Add the fully qualified domain name of the server(s) to the variable ‘LIST_OF_ALL_LDAP_MASTERS’ in ‘conf/ldapx.main.conf‘. (Only necessary if you want more then one master server.)
   • Optional step: Change the password of the ldap admin (_LDAP_ADMIN_PW), the gpg password file (_GPG_FILE_PW) and the gpg user password file (_GPG_FILE_PW_USER)
     (Leave it blank to enter them during the installation)
6. Optional step: In the file ‘conf/ldapx.tls.conf’ change the values of TLS_CA_LOCALITY/TLS_CA_STATE/TLS_CA_COUNTRYCODE/…
7. Become root with the command:
   user@yourbox:~$ sudo su
8. Important: Add the fully qualified domain name of the server(s) to ‘/etc/hosts‘.

   127.0.0.1       localhost
   #127.0.1.1       yourbox.domain.name yourbox
   10.0.0.1        yourbox.domain.name yourbox

9. Make the two scripts executable with:
   root@yourbox:/home/user/LDAPX# chmod +x installLDAPX.sh
   and
   root@yourbox:/home/user/LDAPX# chmod +x setupLDAPX.sh
10. Run the script:
    root@yourbox:/home/user/LDAPX# ./setupLDAPX.sh
11. Start the installation process with the menu item ‘Install first master server’
12. You can find some more information in the file: ‘backup/ldapx.info‘
13. Test the setup:
    • kinit
      1. Use kinit to request a kerberos ticket:
         root@yourbox:/home/user/LDAPX# kinit doejo
      2. The default password for user doejo is ‘winter2014#’
      3. Use klist to list your cached Kerberos ticket.
    • ssh
      1. ssh to yourbox with:
         ssh doejo@yourbox
      2. Use your new password or ‘winter2014#’ if you did not change it above.
      3. Use klist to list your cached Kerberos ticket.
      4. Try to become root with doejo@yourbox:~# sudo su –