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This is the PAM to RADIUS authentication module. It allows any Linux, OSX or Solaris machine to become a RADIUS client for authentication and password change requests. You will need to supply your own RADIUS server to perform the actual authentication.

The latest version has a simple merger of the original pam_radius session accounting code which will work only on Linux.

See INSTALL for instructions on building and installing this module. It has been successfully used it for RADIUS authentication on RedHat 4.2, RedHat 5.x, RedHat 6.x, Solaris 2.6 and OSX 10.9.1.

A number of options are supported by this module. See USAGE for more details.

Care should be taken when configuring RADIUS authentication. Your RADIUS server should have a minimal set of machines in it's 'clients' file. The server should NOT be visible to the world at large, but should be contained behind a firewall. If your RADIUS server is visible from the Internet, a number of attacks become possible.

Any additional questions can be directed to the FreeRADIUS user's mailing list

For the latest version and updates, see the main web or ftp site:

The pam_radius_auth module based on an old version of Cristian Gafton's pam_radius.c, and on the RADIUS Apache module.

The source contains a full suite of RADIUS functions, instead of using libpwdb. It makes sense, because we want it to compile out of the box on Linux and Solaris 2.6.

There are minimal restrictions on using the code, as set out in the disclaimer and copyright notice in pam_radius_auth.c.

Building it is straightforward: use GNU make, and type ./configure, followed by make. If you've got some other weird make, you'll have to edit the Makefile to remove the GNU make directives.

Alan DeKok <>