Cool Solution - LDAP search user / simple authentication account
From Univention Wiki
Note: Cool Solutions are articles documenting additional functionality based on Univention products.
Not all of the shown steps in the article are covered by Univention Support. For questions about your support coverage contact your contact person at Univention before you want to implement one of the shown steps.
For security reasons we recommend to create a simple authentication user, which can read LDAP entries but is not able to login to any service provided.
How to open the Users module
Open the Univention Management Console via a webbrowser of your choice with the FQDN or the ip address of your server, like ucs.example.com. After the login you should see the following overview site:
Click on the sector "Users" to get an overview of all modules in this category. Your site should be look like the following picture.
Click on the "Users"-module to get an overview of all your users and the option to create a new user.
Create a User with LDAP read permission
If you've installed UCS@school please make sure to select the right container (<LDAP Base>:users) for the LDAP search user.
First create a new user using the UMC by opening the Users module and then using the "Add" button. Click on Advanced in the new window.
Fill out all neccessary text fields (lastname, username and a safety password) and go to the "Option" tab. Untag all checkboxes except "simple authentication".
Test commands
With the following shell command you can check if the created user is able to read the LDAP entries:
ldapsearch -x -D uid=<LDAP user>,cn=users,$(/usr/sbin/ucr get ldap/base) -W uid=Administrator
and enter the password of the LDAP search user. If you can see the Administrator's user object the search user is configured correctly and can be used in services to query the LDAP.
LDAP attributes and values
| Attribute | Values | Explanation |
|---|---|---|
| LDAP hostname | <ip of the server> or <FQDN of the server> | To get the FQDN, run hostname -f on the UCS DC Master
|
| LDAP port | 7389, or 7636 for SSL | If the app Active Directory-compatible Domain Controller is installed, the ports 389 and 636 are reserverd for Samba/AD |
| LDAP method | plain | |
| LDAP base | To get the LDAP base from your domain, run ucr get ldap/base on any UCS system.
| |
| LDAP uid | uid | The attribute "uid" contains the username for the LDAP search user. |
| LDAP bind dn | DN of your LDAP search user | To get the DN, run univention-ldapsearch -D uid=Administrator,cn=users,$(/usr/sbin/ucr get ldap/base) uid=<username of your LDAP search user> dn on any UCS system.
|
| LDAP password | <password of your LDAP search user> | |
| LDAP filter | objectClass=organizationalPerson | Only users matching the filter are found using the LDAP filter. Can be expaneded. |
| User DN | cn=users,<LDAP base> | Default LDAP path to where the users are stored. |
| Group DN | cn=groups,<LDAP base> | Default LDAP path to where the groups are stored. |
| Group filter | objectClass=univentionGroup | Only groups matching the filter are found using the LDAP filter. Can be expaneded. |
| Group attribute | cn | Attribute the group name is stored in the LDAP. |
Troubleshooting
Possible error messages may appear:
> (ldap) Authentication failure! invalid_credentials encountered.
Solution: Check, with the following command, if your bind user (LDAP search user) has the needed access rights to search through the LDAP entries.
univention-ldapsearch -D <DN of your user> -W
If you receive no error message, re-check the configuration of the LDAP plugin. Otherwise, try to work through these wiki article again.
Another error message could be:
> (ldap) Authentication failure! ldap_error: Net::LDAP::Error, Connection reset by peer - SSL_connect
Solution: This error message can have several causes. One of the common reason is that the port number has been set incorrectly.
- LDAP Port: 7389
- LDAP Port (SSL): 7636
