Aug 04, 2018 Our recent guide on FreeRADIUS was for how to Install FreeRADIUS and Daloradius on CentOS 7 and RHEL 7. FreeRADIUS is an open source, high-performance, modular, scalable and feature-rich RADIUS server. It ships with both server and radius client, development libraries and numerous additional RADIUS related utilities. Building from Source. Tar -zxvf freeradius.tar.gz./configure make sudo make install. Platform specific instructions are available for: Debian and Ubuntu. RHEL and Centos. Suse and OpenSuse.

In this post I will say something about FreeRadius config files, database connection, basic instruction how to insert user in database, etc. Before you step inside this post, I recommend reading part 1 and part 2.

I suppose you’re using RH based distros (Red Hat, CentOS, Fedora,.) and you already installed FreeRadius from source (config files are located in /usr/local/etc/raddb/). Now lets get back to FreeRadius source dir (the place where you extracted the tar.gz).

In that file, look for the line: 127.0.0.1 secret 1. Below that line, add the following: 192.168.1.216 PASSWORD 3. Make sure to change the IP address to match that of your FreeRADIUS server.

Inside redhat dir you can find freeradius-radiusd-init script which can be used for easy start/stop radiusd process. Copy this script to /etc/init.d/ dir

Now open /etc/init.d/radiusd script and change the next lines

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into

Save changes and exit from editor. (Notice above that we actually changed the path from / to /usr/local/)

Now you can easily start/stop radiusd process.

Also, you can exec chkconfig –level 235 radiusd on to start radiusd on boot.

Now lets get back to our setup.

I suppose you have at least one NAS (A Network Access Server (NAS) is a system that provides access to a network. In some cases also known as a Terminal Server or Remote Access Server (RAS).) NAS is a CLIENT for your radiusd server so please do not mess users and clients. Freeradius doesn’t interact with your users directly so “radius client” is another term for NAS.

The first step is to add your NAS to client list and to create a unique password. Inside clients.conf (/usr/local/etc/raddb/clients.conf) you can find the next lines

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Uncomment those lines and set up client IP address according to your addresses. In the example shown above, all IPs from 192.168.0.0/24 network will be able to use your radiusd server.

You can allow any IP with

which means all IPs in the world can use my radius server (which is not recommended)…

To allow only one IP (in this case 192.168.0.15),

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Free Radius For Linux Install Programs

Delete user Cleartext-Password := “password” line from users because we don’t need this any more.

Stop radiusd and start in debugging mode (radiusd -X).

You should see the similar lines

This means that radiusd will allow NAS with IP address 192.168.0.15 and secret mysecret. Ctrl+C to stop radiusd.

In case you want to use MySQL with freeradius, you should do the next steps. Before anything, you need to create a database for freeradius.

Connect as root to your mysql and exec next queries.

Another option is to use admin.sql script from raddb/sql/mysql dir.

This script will set a little bit safer permissions where radius will be able only to write radacct and radpostauth tables. (Do not forget to change default username/pass shown above).

The next step is to import default Freeradius tables (the sql files can be found inside raddb/sql/mysql dir). You should import nas.sql and schema.sql. The nas.sql will create a table for your NASes. It is much easier to maintain the NAS list inside database then inside clients.conf. Also, you can add more fields to nas table so you can do other operations with your NAS.

After this operations you should have something like:

Now we have a working database and we need to configure FreeRadius to use SQL.

Install Freeradius

radiusd.conf

Open radiusd.conf file (/usr/local/etc/raddb/radiusd.conf), and uncomment $INCLUDE sql.conf line inside modules section. Save changes and exit.

sql.conf

Open sql.conf and edit next lines

to fit your settings (database name, username and password).

dialup.conf

Then open /usr/local/etc/raddb/sql/mysql/dialup.conf and find the next lines (near the end)

Sometimes you will need to check users for simultaneous use and uncommenting sql in session section and uncommenting the query shown above will help you to do this.

default

Now open /usr/local/etc/raddb/sites-available/default and uncomment sql lines inside authorize, accounting and session sections. You can uncomment sql inside post-auth section too if you want to log login attempts (notice that this is not recommended for production servers. Your database can grow and eat up all free space in case someone tries to brute force your NAS.).

Then comment the next lines: files inside authorize section, detail, unix and radutmp inside accounting section and radutmp inside session section.

Please note that those lines we commented above are not important for now and commenting those lines can improve performance. Also, note that detail should remain uncommented in case you want to create ‘detail’ed log of the packets for accounting requests. You will need this in case you want to proxy accounting to another server.

Then save the file and check your config with radiusd -X (debugging mode).

After this you should see something like

which means your freeradius server successfully connected to MySQL database.

There are hundreds of options inside the files shown above and it is impossible to explain all of them. Read comments inside config files and try to figure yourself about them. If you’re using another database scheme, you will need to set up sql.conf and dialup.conf according to your tables. All parameters are editable and it is very easy to understand them. For example if you have a large number on users (1000-xxxx) open sql.conf and increase num_sql_socks from 5 to 15 or 20.

Free Radius For Linux Installation

You should not change/delete any other lines in the config file without reading and understanding the comments!

Populating tables and testing

This is the most important part. Before you continue, you need to know what actually do you want from FreeRadius. Which kind of connection do you expect, etc. Also, you need to know something about tables, attributes, operators, etc.

This is it for now…. Next time we will add some users inside database and see what we can do.

Stay tuned…

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