How to Configure LDAP Authentication for Nagios on CentOS 5.5

This article assume that you already installed the nagios server on LAMP CentOS server and also installed 389 directory server. On the previous tutorial, the user that allowed to manage nagios is nagiosadmin which has been created using htpasswd. In this article, i will show you on how configure LDAP authentication for Nagios on CentOS 5.5.

Prerequisites
How to Install Apache Httpd Web Server on Linuxrel=”nofollow”
How to Install 389 Directory Server on CentOS/RHEL

1. Configure nagios.conf and change it to your LDAP environment. Assume the following info is valid on LDAP server:

    Server ip = 192.168.2.5
    Suffix = dc=intranet, dc=local
    LDAP user : user1 ( most of the time, this user is sytem administrator)
    
    [root@server ~]# vi /etc/httpd/conf.d/nagios.conf
    
    ScriptAlias /nagios/cgi-bin "/usr/lib/nagios/cgi"
    
    <Directory "/usr/lib/nagios/cgi">
       Options ExecCGI
       AllowOverride None
       Order allow,deny
       Allow from all
       AuthBasicProvider ldap
       AuthType Basic
       AuthzLDAPAuthoritative on
       AuthName " LDAP Authentication for Nagios Monitoring"
       AuthLDAPURL "ldap://192.168.2.5:389/DC=intranet,DC=local?uid?sub?(objectClass=*)" NONE
       Require user
    </Directory>
    
    Alias /nagios "/usr/share/nagios"
    
    <Directory "/usr/share/nagios">
       Options None
       AllowOverride None
       Order allow,deny
       Allow from all
       AuthBasicProvider ldap
       AuthType Basic
       AuthzLDAPAuthoritative on
       AuthName " LDAP Authentication for Nagios Monitoring"
       AuthLDAPURL "ldap://192.168.2.5:389/DC=intranet,DC=local?uid?sub?(objectClass=*)" NONE
       Require user
    </Directory>
    

2. Replace all of the “nagiosadmin” entries with “*” in /etc/nagios/cgi.cfg. This is to prevent the error message in CGI authentication.

    It appears as though you do not have permission to view information for any of the hosts you requested...
    
    If you believe this is an error, check the HTTP server authentication requirements for accessing this CGI
    and check the authorization options in your CGI configuration file.
    
    
    [root@server ~]# grep "nagiosadmin" /etc/nagios/cgi.cfg | grep -v "#"
    
    authorized_for_system_information=nagiosadmin
    authorized_for_configuration_information=nagiosadmin
    authorized_for_system_commands=nagiosadmin
    authorized_for_all_services=nagiosadmin
    authorized_for_all_hosts=nagiosadmin
    authorized_for_all_service_commands=nagiosadmin
    authorized_for_all_host_commands=nagiosadmin
    
    [root@server ~]# vi /etc/httpd/conf.d/nagios.conf
    

Replace nagiosadmin to * as below:

    authorized_for_system_information=*
    authorized_for_configuration_information=*
    authorized_for_system_commands=*
    authorized_for_all_services=*
    authorized_for_all_hosts=*
    authorized_for_all_service_commands=*
    authorized_for_all_host_commands=*
    
    [root@server ~]# grep "*" /etc/nagios/cgi.cfg | grep -v "#"
    authorized_for_system_information=*
    authorized_for_configuration_information=*
    authorized_for_system_commands=*
    authorized_for_all_services=*
    authorized_for_all_hosts=*
    authorized_for_all_service_commands=*
    authorized_for_all_host_commands=*
    

3. Restart the nagios service

    [root@server ~]# /etc/init.d/nagios restart
    Stopping nagios:                                           [  OK  ]
    Starting nagios:                                           [  OK  ]
    

4. Restart apache server

    [root@server ~]# /etc/init.d/httpd restart
    Stopping httpd:                                            [  OK  ]
    Starting httpd:                                            [  OK  ]
    

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2 Comments

  • Avatar for Srinivasa Nallapati Srinivasa Nallapati says:

    can you tell me service based authentications .

    Like follows :

    user 1:
    in host1
    service 1
    service 2 

    user 2:
    in host1
    service 3
    service 2 

  • Avatar for Amir Amir says:

    hi, is there any possible configuration in nagios or appache to login in nagios with via ldap with users name in lower and upper case?
    Thanks&Regards,
    Amir

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