pam_radius

This is the PAM to RADIUS authentication module. It allows any Linux, OSX or Solaris machine to become a RADIUS client for authentication. 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 for RADIUS authentication on CentOS, RHEL and Rocky Linux versions 7 to 9, Debian, Ubuntu, many older Linux distributions such as RedHat 5.x and RedHat 6.x, as well as 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 its '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: https://www.freeradius.org/support/

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

• https://freeradius.org/pam_radius_auth/
• ftp://ftp.freeradius.org/pub/radius/

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 aland@freeradius.org

Debugging

When building under clang and some later versions of GCC with --enable-developer, you can add the following flags:

• --enable-address-sanitizer, enables address sanitizer (detects use after free issues, and out of bounds accesses).

• --enable-leak-sanitizer, enables leak sanitizer (detects memory leaks).

Packages

RPM (RedHat, CentOS, Rocky Linux etc)

$ ./configure
$ make rpm
$ rpm -ivh rpmbuild/RPMS/x86_64/pam*.rpm

Configuration example for sshd+PAM in redhat/pam_sshd_example

DEB (Debian, Ubuntu etc)

$ ./configure
$ make deb
$ dpkg -i ../libpam-radius-auth_*.deb

Configuration example for sshd+PAM in debian/pam_sshd_example