May 09, 2013  Share This. Windows BSD Linux. Mod_auth_kerb is a module that provides Kerberos user authentication to the Apache web server. It allows to retrieve the username/password pair, and also supports full Kerberos authentication (also known as Negotiate or SPNEGO based authentication).

Kerberos Module for Apache Configuration This page describes configuration of module version 5.0. Configuration guide for the older module 4.x can be found. Before starting configuring the module make sure your Kerberos enviroment is properly configured (i.e.

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KDC, /etc/krb5.conf, etc.). The easiest way to check is using the kinit command from the apache machine to get a ticket for some known principal (preferably that one who will be used to test the module).

Now you have to create an service key for the module, which is needed to perform client authentication. Verification of the kerberos password has two steps. In the first one the KDC is contacted using the password trying to receive a ticket for the client. After this ticket is sucessfuly acquired, the module must also verify that KDC hasn't been deliberately faked and the ticket just received can be trusted. If this check would haven't been done any attacker capable of spoofing the KDC could impersonate any principal registered with the KDC.

In order to do this check the apache module must verify that the KDC knows its service key, which the apache shares with the KDC. This service key must be created during configuration the module. This service key is also needed when the Negotiate method is used.

In this case the module acts as a standard kerberos service (similarly to e.g. Kerberized ssh or ftp servers). Default name of the service key is HTTP/@REALM, another name of the first instance can be set using the KrbServiceName option. The key must be stored in a keytab on a local disk, the Krb5Keytab and Krb4Srvtab options are used to specify the filename with the keytab. This file should be only readable for the apache process and contain only the key used for www authentication.

In order to get the module loaded on start of apache add following line to your httpd.conf: LoadModule auth_kerb_module libexec/mod_auth_kerb.so AuthType type For Kerberos authentication to work, AuthType must be set to • Kerberos For the reasons of backwards compatibility the values KerberosV4 and KerberosV5 are also supported. Their use is not recommended though, for finer setting use following three options. KrbMethodNegotiate on off (set to on by default) To enable or disable the use of the Negotiate method. You need a special support on the browser side to support this mechanism. KrbMethodK5Passwd on off (set to on by default) To enable or disable the use of password based authentication for Kerberos v5. KrbMethodK4Passwd on off (set to on by default) To enable or disable the use of password based authentication for Kerberos v4. Adobe photoshop cc 2014 serial number. KrbAuthoritative on off (set to on by default) If set to off this directive allow authentication controls to be pass on to another modules.