http://freeradius.org/
https://github.com/FreeRADIUS/freeradius-server/tree/v3.0.x/doc/
1. INTRO All code in this server was written for this project. The server is mostly compatible with Livingston radiusd-2.01 (no menus or s/key support though) but with more features, such as: o Can limit the maximum number of simultaneous logins on a per-user basis! o Multiple DEFAULT entries, that can optionally fall-through. o In fact, every entry can fall-through o Deny/permit access based on huntgroup users dials into o Set certain parameters (such as static IP address) based on huntgroup o Extra "hints" file that can select SLIP/PPP/rlogin based on username pattern (Puser or user.ppp is PPP, plain "user" is rlogin etc). o Can execute an external program when user has authenticated (for example to run a sendmail queue). o Can use `$INCLUDE filename' in radiusd.conf, users, and dictionary files o Can act as a proxy server, relaying requests to a remote server o Supports Vendor-Specific attributes o Supports many different plug-in modules for authentication, authorization, and accounting. 2. INSTALLATION See the INSTALL file, in the parent directory. 3. CONFIGURATION FILES For every file there is a fully commented example file included, that explains what is does, and how to use it. Read those sample files too! Again, many of the configuration files are ONLY documented in the comments included in the files. Reading the configuration files is REQUIRED to fully understand how to create complex configurations of the server. 3a. CLIENTS Make sure the clients (portmasters, Linux with portslave etc) are set up to use the host radiusd is running on as authentication and accounting host. Configure these clients to use a "radius secret password". For every client, also enter this "secret password" into the file /etc/raddb/clients. See also the manual page for clients(5). 3b. NASLIST Every NAS (Network Access Server, also known as terminal server) should have an entry in this file with an abbreviated name and the type of NAS it is. Currently FreeRADIUS supports the following NAS types: Terminal Server Type in naslist 3Com/USR Hiper Arc Total Control usrhiper 3Com/USR NetServer netserver 3Com/USR TotalControl tc Ascend Max 4000 family max40xx Cisco Access Server family cisco Cistron PortSlave portslave Computone PowerRack computone Cyclades PathRAS pathras Livingston PortMaster livingston Multitech CommPlete Server multitech Patton 2800 family patton Usually this is the same list as in the "clients" file, but not every NAS is a client and not every client is a NAS (this will start to make sense if you use radius proxy servers). 3c. NASPASSWD If ``checkrad'' needs to login on your terminal server to check who is online on a certain port (i.e. it's not possible to use SNMP or finger) you need to define a loginname and password here. This is normally ONLY needed for USR/3Com Total Control, NetServer and Cyclades PathRAS terminal servers! 3d. HINTS Customize the /etc/raddb/mods-config/preprocess/hints file. This file is used to give users different login type based on a prefix/suffix of their loginname. For example, logging in as "user" may result in a rlogin session to a Unix system, and logging in as "Puser" could start a PPP session. 3e. HUNTGROUPS This is the /etc/raddb/mods-config/preprocess/huntgroups file. Here you can define different huntgroups. These can be used to: - restrict access to certain huntgroups to certain users/groups of users (define this in the huntgroups file itself) - match a loginname with a huntgroup in /etc/raddb/users. One use for this is to give a user a static IP address based on the huntgroup / Point of Presence (s)he dials in to. 3f. USERS With the original RADIUS server, every user had to be defined in this file. There could be one default entry, where you could for example define that a user not in the radius file would be checked agains the UNIX password file and on successful login would get a PPP connection. In the new style file, you can define multiple DEFAULT entries. All entries are processed in the order as they appear in the users file. If an entry matches the username, radiusd will stop scanning the users file unless the attribute "Fall-Through = Yes" is set. You can uses spaces in usernames by escaping them with \ or by using quotes. For example, "joe user" or joe\ user. The FreeRADIUS server does not trim any spaces from a username received from the portmaster (Livingston does, in perl notation, $user =~ s/\s+.*//;) 3g. NEW RADIUS ATTRIBUTES (to be used in the USERS file). Name Type Descr. ---- ---- ------ Simultaneous-Use integer Max. number of concurrent logins Fall-Through integer Yes/No Login-Time string Defines when user may login. Current-Time string Allows you to perform time-based checks when a request is received. Login-Time defines the time span a user may login to the system. The format of a so-called time string is like the format used by UUCP. A time string may be a list of simple time strings separated by "|" or ",". Each simple time string must begin with a day definition. That can be just one day, multiple days, or a range of days separated by a hyphen. A day is Mo, Tu, We, Th, Fr, Sa or Su, or Wk for Mo-Fr. "Any" or "Al" means all days. After that a range of hours follows in hhmm-hhmm format. For example, "Wk2305-0855,Sa,Su2305-1655". radiusd calculates the number of seconds left in the time span, and sets the Session-Timeout to that number of seconds. So if someones Login-Time is "Al0800-1800" and she logs in at 17:30, Session-Timeout is set to 1800 seconds so that she is kicked off at 18:00. 4. LOG FILES 4a. /var/log/radius/radutmp In this file the currently logged in users are held. The program "radwho" reads this file and gives you a summary. Rogue sessions can be deleted from this file with the "radzap" program. 4b. /var/log/radius/radwtmp This file is "wtmp" compatible and keeps a history of all radius logins/ logouts. This file can be read with the "last" program, and other Unix accounting programs (such as "ac" and "sac") can be used to produce a summary. 4c. /var/log/radius/radius.log All RADIUS informational, diagnostic and error messages are logged in this file, including all login attempts. 4d. /var/log/radius/radacct/<client_ip>/detail This is the original radius logfile, as written by all the Livingston radius servers. It's only created if the directory /var/log/radius/radacct exists. For more configuration options on the detail file please see raddb/mods-available/detail as it expands upon this greatly. 5. MORE INFO, SUPPORT The latest version of FreeRADIUS is always available from the git repository hosted on GitHub at https://github.com/FreeRADIUS/freeradius-server or see http://freeradius.org/git/ for more information. There are two mailing lists for users and developers. General user, administrator and configuration issues should be discussed on the users list at: http://lists.freeradius.org/mailman/listinfo/freeradius-users When asking for help on the users list, be sure the include a detailed and clear description of the problem, together with full debug output from FreeRADIUS, obtained by running radiusd -X Developers only discussion is to be had on the devel list: http://lists.freeradius.org/mailman/listinfo/freeradius-devel Please do not raise general configuration issues here. 6. OTHER INFORMATION The files in other directories are: debian/ Files to build a "freeradius" Debian Linux package. doc/ Various snippets of documentation doc/rfc/ Copies of the RFC's. If you have Perl, do a 'make' in that directory, and look at the HTML output. libltdl/ Libtool platform independent library system. man/ Unix Manual pages for the server, configuration files, and associated utilities. mibs/ SNMP Mibs for the server. raddb/ Sample configuration files for the server. redhat/ Additional files for a RedHat Linux system. scripts/ Sample scripts for startup and maintenance. src/ Source code src/main source code for the daemon and associated utilities src/lib source code for the RADIUS library src/include header files src/modules dynamic plug-in modules suse/ Aditional files for a SuSE (UnitedLinux) system. todo/ TODO list and assorted files. If you have ANY problems, concerns, or surprises when running the server, then run it in debugging mode, as root, from the command line: $ radiusd -X It will produce a large number of messages. The answers to many questions, and the solution to many problems, can usually be found in these messages. For further details, see: http://www.freeradius.org/faq/ and the 'bugs' file, in this directory. $Date$