Удивительно, но нигде в интернете я не нашел примера конфигурации FreeRadius 2 c MS SQL. Пришлось написать.

Инсталляция ПО для CentOS

yum install freeradius2 freeradius2-unixODBC freetds unixODBC

Конфигурация FreeRadius2

Добавляем /etc/freetds.conf:

[server name]
host = ip/hostname
port = 1433
tds version = 8.0

Делаем файл - шаблон конфигурации драйвера:

[TDS]
        Description     = FreeTDS with protocol v8.0
        Driver          = /usr/lib64/libtdsodbc.so.0

Устанавливаем драйвер:

odbcinst -i -d -f шаблон_конфигурации_драйвера

Делаем файл - шаблон конфигурации источника данных:

[server name]
        Driver          = TDS
        Description     = Radius database
        Trace           = No
        Servername      = server_name
        Database        = database_name
        UID             = sql_login
        PWD             = sql_password

Устанавливаем его как системный (это важно!) источник данных:

odbcinst -i -s -l -f шаблон_конфигурации_источника_данных

Вот мой минимально работоспособный /etc/raddb/sql.conf:

##
## sql.conf -- SQL modules
##
## $Id$

sql {
 #
 #  Set the database to one of:
 #
 # mysql, mssql, oracle, postgresql
 #
 database = "mssql"

 #
 #  Which FreeRADIUS driver to use.
 #
 driver = "rlm_sql_unixodbc"

 # Connection info:
 server = "server_name"
 login = "sql_login"
 password = "sql_password"

 # Database table configuration for everything except Oracle
 radius_db = "database_name"

 # If you want both stop and start records logged to the
 # same SQL table, leave this as is.  If you want them in
 # different tables, put the start table in acct_table1
 # and stop table in acct_table2
 acct_table1 = "radacct"
 acct_table2 = "radacct"

 # Allow for storing data after authentication
 postauth_table = "radpostauth"

 authcheck_table = "radcheck"
 authreply_table = "radreply"

 groupcheck_table = "radgroupcheck"
 groupreply_table = "radgroupreply"

 # Table to keep group info
 usergroup_table = "radusergroup"

 # If set to 'yes' (default) we read the group tables
 # If set to 'no' the user MUST have Fall-Through = Yes in the radreply table
 # read_groups = yes

 # Remove stale session if checkrad does not see a double login
 deletestalesessions = yes

 # Print all SQL statements when in debug mode (-x)
 sqltrace = no
 sqltracefile = ${logdir}/sqltrace.sql

 # number of sql connections to make to server
 num_sql_socks = 5

 # number of seconds to dely retrying on a failed database
 # connection (per_socket)
 connect_failure_retry_delay = 60

 # lifetime of an SQL socket.  If you are having network issues
 # such as TCP sessions expiring, you may need to set the socket
 # lifetime.  If set to non-zero, any open connections will be
 # closed "lifetime" seconds after they were first opened.
 lifetime = 0

 # Maximum number of queries used by an SQL socket.  If you are
 # having issues with SQL sockets lasting "too long", you can
 # limit the number of queries performed over one socket.  After
 # "max_qeuries", the socket will be closed.  Use 0 for "no limit".
 max_queries = 0

 # Set to 'yes' to read radius clients from the database ('nas' table)
 # Clients will ONLY be read on server startup.  For performance
 # and security reasons, finding clients via SQL queries CANNOT
 # be done "live" while the server is running.
 # 
 #readclients = yes

 # Table to keep radius client info
 #nas_table = "nas"
 
 # Read driver-specific configuration
    $INCLUDE sql/${database}/queries.conf
}

Конфигурация БД MS SQL

-- структура БД
CREATE TABLE [dbo].[radacct] (
 [RadAcctId] BIGINT IDENTITY (1, 1) NOT NULL ,
 [AcctSessionId] VARCHAR (64) NOT NULL ,
 [AcctUniqueId] VARCHAR (32) NOT NULL ,
 [UserName] VARCHAR (253) ,
 [GroupName] VARCHAR (253) ,
 [Realm] VARCHAR (64) ,
 [NASIPAddress] VARCHAR (15) NOT NULL ,
 [NASPortId] VARCHAR (15) ,
 [NASPortType] VARCHAR (32) ,
 [AcctStartTime] DATETIME2 ,
 [AcctStopTime] DATETIME2 ,
 [AcctSessionTime] BIGINT ,
 [AcctAuthentic] VARCHAR (32) ,
 [ConnectInfo_start] VARCHAR (50) ,
 [ConnectInfo_stop] VARCHAR (50) ,
 [AcctInputOctets] BIGINT ,
 [AcctOutputOctets] BIGINT ,
 [CalledStationId] VARCHAR (50) ,
 [CallingStationId] VARCHAR (50) ,
 [AcctTerminateCause] VARCHAR (32) ,
 [ServiceType] VARCHAR (32) ,
 [XAscendSessionSvrKey] VARCHAR (10) ,
 [FramedProtocol] VARCHAR (32) ,
 [FramedIPAddress] VARCHAR (15) ,
 [AcctStartDelay] INT ,
 [AcctStopDelay] INT, 
 CONSTRAINT [PK_radacct] PRIMARY KEY CLUSTERED ( [RadAcctId] )
) ON [PRIMARY]
GO

CREATE  INDEX [IX_radacct_active_user] ON [dbo].[radacct] (UserName, NASIPAddress, AcctSessionId) WHERE AcctStopTime IS NULL ON [PRIMARY]
GO

CREATE  INDEX [IX_radacct_start_user] ON [dbo].[radacct] (AcctStartTime, UserName) ON [PRIMARY]
GO

CREATE TABLE [dbo].[radcheck] (
 [id] INT IDENTITY (1, 1) NOT NULL ,
 [UserName] VARCHAR (64) NOT NULL DEFAULT '',
 [Attribute] VARCHAR (64) NOT NULL DEFAULT '',
 [op] CHAR (2) NOT NULL DEFAULT '==',
 [Value] VARCHAR (253) NOT NULL DEFAULT '',
 CONSTRAINT [PK_radcheck] PRIMARY KEY  CLUSTERED ( [id] )
) ON [PRIMARY]
GO

CREATE  INDEX [IX_radcheck] ON [dbo].[radcheck]([UserName]) ON [PRIMARY]
GO

CREATE TABLE [dbo].[radgroupcheck] (
 [id] INT IDENTITY (1, 1) NOT NULL ,
 [GroupName] VARCHAR (64) NOT NULL DEFAULT '',
 [Attribute] VARCHAR (64) NOT NULL DEFAULT '',
 [op] CHAR (2) NOT NULL DEFAULT '==',
 [Value] VARCHAR (253) NOT NULL DEFAULT '',
 CONSTRAINT [PK_radgroupcheck] PRIMARY KEY  CLUSTERED ([id])
) ON [PRIMARY]
GO

CREATE  INDEX [IX_radgroupcheck] ON [dbo].[radgroupcheck]([GroupName]) ON [PRIMARY]
GO

CREATE TABLE [dbo].[radgroupreply] (
 [id] INT IDENTITY (1, 1) NOT NULL ,
 [GroupName] VARCHAR (64) NOT NULL DEFAULT '',
 [Attribute] VARCHAR (64) NOT NULL DEFAULT '',
 [op] CHAR (2) NOT NULL DEFAULT '=',
 [Value] VARCHAR (253) NOT NULL DEFAULT '',
 CONSTRAINT [PK_radgroupreply] PRIMARY KEY  CLUSTERED ([id]) 
) ON [PRIMARY]
GO

CREATE  INDEX [IX_radgroupreply] ON [dbo].[radgroupreply]([GroupName]) ON [PRIMARY]
GO

CREATE TABLE [dbo].[radreply] (
 [id] INT IDENTITY (1, 1) NOT NULL ,
 [UserName] VARCHAR (64) NOT NULL DEFAULT '',
 [Attribute] VARCHAR (64) NOT NULL DEFAULT '',
 [op] CHAR (2) NOT NULL DEFAULT '=',
 [Value] VARCHAR (253) NOT NULL DEFAULT '',
 CONSTRAINT [PK_radreply] PRIMARY KEY  CLUSTERED ([id]) 
) ON [PRIMARY]
GO

CREATE  INDEX [IX_radreply] ON [dbo].[radreply]([UserName]) ON [PRIMARY]
GO

CREATE TABLE [dbo].[radusergroup] (
 [UserName] VARCHAR (64) NOT NULL DEFAULT '',
 [GroupName] VARCHAR (64) NOT NULL DEFAULT ''
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[radpostauth] (
 [id] INT IDENTITY (1, 1) NOT NULL ,
 [username] VARCHAR (253) NOT NULL ,
 [pass] VARCHAR (128) ,
 reply VARCHAR (32) ,
 CalledStationId VARCHAR(50) ,
 CallingStationId VARCHAR(50) ,
 authdate DATETIME2 NOT NULL DEFAULT CURRENT_TIMESTAMP,
) ON [PRIMARY]
GO

-- тестовые данные
INSERT INTO radcheck VALUES ('test123', 'User-Password', ':=', '12345');

INSERT INTO radgroupcheck VALUES ('group', 'Auth-Type', '=', 'PAP');

INSERT INTO radgroupreply VALUES ('testgroup', 'Framed-IP-Address', '=', '10.0.1.0');
INSERT INTO radgroupreply VALUES ('testgroup', 'Framed-IP-Netmask', '=', '255.255.255.0');
INSERT INTO radgroupreply VALUES ('group', 'Framed-IP-Address', '=', '192.168.0.0');
--INSERT INTO radgroupreply VALUES ('group', 'Framed-Compression', '=', 'no');
INSERT INTO radgroupreply VALUES ('group', 'Session-Timeout', '=', '0');
INSERT INTO radgroupreply VALUES ('group', 'Idle-Timeout', '=', '0');
INSERT INTO radgroupreply VALUES ('group', 'Port-Limit', '=', '0');
INSERT INTO radgroupreply VALUES ('group', 'Framed-IP-Netmask', '=', '255.255.255.0');

INSERT INTO radreply VALUES ('test123', 'Framed-IP-Address', '=', '10.0.77.17');
--INSERT INTO radreply VALUES ('test123', 'Framed-Compression', '=', 'no');

INSERT INTO radusergroup VALUES ('test123', 'group');

Создаем папку /etc/raddb/sql/mssql и в ней файл queries.conf, в котором будут лежать все запросы к БД:

# Safe characters list for sql queries. Everything else is replaced
# with their mime-encoded equivalents.
# The default list should be ok
# safe-characters = "@abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-_: /"

#######################################################################
#  Query config:  Username
#######################################################################
# This is the username that will get substituted, escaped, and added
# as attribute 'SQL-User-Name'.  '%{SQL-User-Name}' should be used
# below everywhere a username substitution is needed so you you can
# be sure the username passed from the client is escaped properly.
#
# Uncomment the next line, if you want the sql_user_name to mean:
#
#    Use Stripped-User-Name, if it's there.
#    Else use User-Name, if it's there,
#    Else use hard-coded string "none" as the user name.
#
#sql_user_name = "%{%{Stripped-User-Name}:-%{%{User-Name}:-none}}"

sql_user_name = "%{User-Name}"

#######################################################################
#  Default profile
#######################################################################
# This is the default profile. It is found in SQL by group membership.
# That means that this profile must be a member of at least one group
# which will contain the corresponding check and reply items.
# This profile will be queried in the authorize section for every user.
# The point is to assign all users a default profile without having to
# manually add each one to a group that will contain the profile.
# The SQL module will also honor the User-Profile attribute. This
# attribute can be set anywhere in the authorize section (ie the users
# file). It is found exactly as the default profile is found.
# If it is set then it will *overwrite* the default profile setting.
# The idea is to select profiles based on checks on the incoming
# packets, not on user group membership. For example:
# -- users file --
# DEFAULT Service-Type == Outbound-User, User-Profile := "outbound"
# DEFAULT Service-Type == Framed-User, User-Profile := "framed"
#
# By default the default_user_profile is not set
#
# default_user_profile = "DEFAULT"

#######################################################################
#  NAS Query
#######################################################################
#  This query retrieves the radius clients
#
#  0. Row ID (currently unused)
#  1. Name (or IP address)
#  2. Shortname
#  3. Type
#  4. Secret
#######################################################################

#nas_query = "SELECT id, nasname, shortname, type, secret FROM ${nas_table}"

#######################################################################
#  Authorization Queries
#######################################################################
#  These queries compare the check items for the user
#  in ${authcheck_table} and setup the reply items in
#  ${authreply_table}.  You can use any query/tables
#  you want, but the return data for each row MUST
#  be in the  following order:
#
#  0. Row ID (currently unused)
#  1. UserName/GroupName
#  2. Item Attr Name
#  3. Item Attr Value
#  4. Item Attr Operation
#######################################################################

# Use these for case insensitive usernames. WARNING: Slower queries!
# authorize_check_query = "SELECT id, UserName, Attribute, Value, Op \
#   FROM ${authcheck_table} \
#   WHERE LOWER(UserName) = LOWER('%{SQL-User-Name}') \
#   ORDER BY id"
# authorize_reply_query = "SELECT id, UserName, Attribute, Value, Op \
#   FROM ${authreply_table} \
#   WHERE LOWER(UserName) = LOWER('%{SQL-User-Name}') \
#   ORDER BY id"

authorize_check_query = "SELECT id, UserName, Attribute, Value, Op \
  FROM ${authcheck_table} \
  WHERE Username = '%{SQL-User-Name}' \
  ORDER BY id"

authorize_reply_query = "SELECT id, UserName, Attribute, Value, Op \
  FROM ${authreply_table} \
  WHERE Username = '%{SQL-User-Name}' \
  ORDER BY id"

# Use these for case insensitive usernames. WARNING: Slower queries!
# authorize_group_check_query = "SELECT ${groupcheck_table}.id, ${groupcheck_table}.GroupName, \
#   ${groupcheck_table}.Attribute, ${groupcheck_table}.Value, ${groupcheck_table}.Op \
#   FROM ${groupcheck_table}, ${usergroup_table} \
#   WHERE LOWER(${usergroup_table}.UserName) = LOWER('%{SQL-User-Name}') AND ${usergroup_table}.GroupName = ${groupcheck_table}.GroupName \
#   ORDER BY ${groupcheck_table}.id"
# authorize_group_reply_query = "SELECT ${groupreply_table}.id, ${groupreply_table}.GroupName, \
#   ${groupreply_table}.Attribute, ${groupreply_table}.Value, ${groupreply_table}.Op \
#   FROM ${groupreply_table}, ${usergroup_table} \
#   WHERE LOWER(${usergroup_table}.UserName) = LOWER('%{SQL-User-Name}') AND ${usergroup_table}.GroupName = ${groupreply_table}.GroupName \
#   ORDER BY ${groupreply_table}.id"

authorize_group_check_query = "SELECT id, GroupName, Attribute, Value, op \
  FROM ${groupcheck_table} \
  WHERE GroupName = '%{Sql-Group}' \
  ORDER BY id"

authorize_group_reply_query = "SELECT id, GroupName, Attribute, Value, op \
  FROM ${groupreply_table} \
  WHERE GroupName = '%{Sql-Group}' \
  ORDER BY id"

#######################################################################
# Simultaneous Use Checking Queries
#######################################################################
# simul_count_query     - query for the number of current connections
#                       - If this is not defined, no simultaneous use checking
#                       - will be performed by this module instance
# simul_verify_query    - query to return details of current connections for verification
#                       - Leave blank or commented out to disable verification step
#                       - Note that the returned field order should not be changed.
#######################################################################

# Uncomment simul_count_query to enable simultaneous use checking
simul_count_query = "SELECT COUNT(*) FROM ${acct_table1} WHERE UserName='%{SQL-User-Name}' AND AcctStopTime IS NULL"
simul_verify_query = "SELECT RadAcctId, AcctSessionId, UserName, NASIPAddress, NASPortId, FramedIPAddress, CallingStationId, FramedProtocol FROM ${acct_table1} WHERE UserName='%{SQL-User-Name}' AND AcctStopTime IS NULL"



#######################################################################
#  Accounting Queries
#######################################################################
# accounting_onoff_query - query for Accounting On/Off packets
# accounting_update_query - query for Accounting update packets
# accounting_update_query_alt - query for Accounting update packets
#                               (alternate in case first query fails)
# accounting_start_query - query for Accounting start packets
# accounting_start_query_alt - query for Accounting start packets
#                               (alternate in case first query fails)
# accounting_stop_query  - query for Accounting stop packets
# accounting_stop_query_alt - query for Accounting start packets
#                               (alternate in case first query doesn't
#                                affect any existing rows in the table)
#######################################################################

accounting_onoff_query = "UPDATE ${acct_table1} \
  SET AcctStopTime = DATEADD(SECOND,-1*%{%{Acct-Delay-Time}:-0},CAST('%S' AS datetime2)), \
  AcctSessionTime = DATEDIFF(SECOND, AcctStartTime, DATEADD(SECOND,-1*%{%{Acct-Delay-Time}:-0},CAST('%S' AS datetime2))), \
  AcctTerminateCause = '%{Acct-Terminate-Cause}', \
  AcctStopDelay = 0 \
  WHERE AcctStopTime IS NULL \
  AND NASIPAddress= '%{NAS-IP-Address}' \
  AND AcctStartTime <= CAST('%S' AS datetime2)"

accounting_update_query = "UPDATE ${acct_table1} \
  SET FramedIPAddress = NULLIF('%{Framed-IP-Address}', ''), \
  AcctSessionTime = '%{Acct-Session-Time}', \
  AcctInputOctets = ((%{%{Acct-Input-Gigawords}:-0} * POWER(2, 32)) + %{%{Acct-Input-Octets}:-0}), \
  AcctOutputOctets = ((%{%{Acct-Output-Gigawords}:-0} * POWER(2, 32)) + %{%{Acct-Output-Octets}:-0}) \
  WHERE AcctSessionId = '%{Acct-Session-Id}' AND UserName = '%{SQL-User-Name}' \
  AND NASIPAddress= '%{NAS-IP-Address}' AND AcctStopTime IS NULL"

accounting_update_query_alt = "INSERT INTO ${acct_table1} \
  (AcctSessionId, AcctUniqueId, UserName, Realm, NASIPAddress, \
  NASPortId, NASPortType, AcctStartTime, \
  AcctSessionTime, AcctAuthentic, AcctInputOctets, \
  AcctOutputOctets, CalledStationId, CallingStationId, \
  ServiceType, FramedProtocol, FramedIPAddress, XAscendSessionSvrKey) \
  VALUES('%{Acct-Session-Id}', '%{Acct-Unique-Session-Id}', \
  '%{SQL-User-Name}', NULLIF('%{Realm}', ''), '%{NAS-IP-Address}', \
  '%{%{NAS-Port}:-NULL}', '%{NAS-Port-Type}', \
  DATEADD(SECOND,-1*(%{%{Acct-Delay-Time}:-0}+%{%{Acct-Session-Time}:-0}),CAST('%S' AS datetime2)), \
  '%{Acct-Session-Time}', '%{Acct-Authentic}', \
  (('%{%{Acct-Input-Gigawords}:-0}' * POWER(2, 32)) + '%{%{Acct-Input-Octets}:-0}'), \
  (('%{%{Acct-Output-Gigawords}:-0}' * POWER(2, 32)) + '%{%{Acct-Output-Octets}:-0}'), \
  '%{Called-Station-Id}', \
  '%{Calling-Station-Id}', '%{Service-Type}', '%{Framed-Protocol}', \
  NULLIF('%{Framed-IP-Address}', ''), '%{X-Ascend-Session-Svr-Key}')"

accounting_start_query = "INSERT INTO ${acct_table1} \
  (AcctSessionId, AcctUniqueId, UserName, Realm, NASIPAddress, \
   NASPortId, NASPortType, AcctStartTime, AcctAuthentic, \
  ConnectInfo_start, CalledStationId, CallingStationId, ServiceType, \
  FramedProtocol, FramedIPAddress, AcctStartDelay, XAscendSessionSvrKey) \
  VALUES('%{Acct-Session-Id}', \
  '%{Acct-Unique-Session-Id}', \
  '%{SQL-User-Name}', \
  NULLIF('%{Realm}', ''), \
  '%{NAS-IP-Address}', \
  '%{%{NAS-Port}:-NULL}', \
  '%{NAS-Port-Type}', \
  DATEADD(SECOND,-1*%{%{Acct-Delay-Time}:-0},CAST('%S' AS datetime2)), \
  '%{Acct-Authentic}', \
  '%{Connect-Info}', \
  '%{Called-Station-Id}', \
  '%{Calling-Station-Id}', \
  '%{Service-Type}', \
  '%{Framed-Protocol}', \
  NULLIF('%{Framed-IP-Address}', ''), \
  0, \
  '%{X-Ascend-Session-Svr-Key}')"

accounting_start_query_alt  = "UPDATE ${acct_table1} \
  SET AcctStartTime = DATEADD(SECOND,-1*%{%{Acct-Delay-Time}:-0},CAST('%S' AS datetime2)), \
  AcctStartDelay = 0, \
  ConnectInfo_start = '%{Connect-Info}' \
  WHERE AcctSessionId = '%{Acct-Session-Id}' \
  AND UserName = '%{SQL-User-Name}' \
  AND NASIPAddress = '%{NAS-IP-Address}' \
  AND AcctStopTime IS NULL"

accounting_stop_query = "UPDATE ${acct_table2} \
  SET AcctStopTime = DATEADD(SECOND,-1*%{%{Acct-Delay-Time}:-0},CAST('%S' AS datetime2)), \
  AcctSessionTime = CASE WHEN '%{Acct-Session-Time}' = '' THEN \
  DATEDIFF(SECOND, AcctStartTime, DATEADD(SECOND,-1*%{%{Acct-Delay-Time}:-0},CAST('%S' AS datetime2)))\
  ELSE '%{Acct-Session-Time}' END, \
  AcctInputOctets = ((%{%{Acct-Input-Gigawords}:-0} * POWER(2, 32)) + %{%{Acct-Input-Octets}:-0}), \
  AcctOutputOctets = ((%{%{Acct-Output-Gigawords}:-0} * POWER(2, 32)) + %{%{Acct-Output-Octets}:-0}), \
  AcctTerminateCause = '%{Acct-Terminate-Cause}', \
  AcctStopDelay = 0, \
  FramedIPAddress = NULLIF('%{Framed-IP-Address}', ''), \
  ConnectInfo_stop = '%{Connect-Info}' \
  WHERE AcctSessionId = '%{Acct-Session-Id}' \
  AND UserName = '%{SQL-User-Name}' \
  AND NASIPAddress = '%{NAS-IP-Address}' \
  AND AcctStopTime IS NULL"

accounting_stop_query_alt = "INSERT INTO ${acct_table2} \
  (AcctSessionId, AcctUniqueId, UserName, Realm, NASIPAddress, NASPortId, NASPortType, AcctStartTime, AcctStopTime, \
  AcctSessionTime, AcctAuthentic, ConnectInfo_stop, AcctInputOctets, AcctOutputOctets, CalledStationId, \
  CallingStationId, AcctTerminateCause, ServiceType, FramedProtocol, FramedIPAddress, AcctStopDelay) \
  values('%{Acct-Session-Id}', \
  '%{Acct-Unique-Session-Id}', \
  '%{SQL-User-Name}', \
  NULLIF('%{Realm}', ''), \
  '%{NAS-IP-Address}', \
  %{%{NAS-Port}:-NULL}, \
  '%{NAS-Port-Type}', \
  DATEADD(SECOND,-1*(%{%{Acct-Delay-Time}:-0}+%{%{Acct-Session-Time}:-0}),CAST('%S' AS datetime2)), \
  DATEADD(SECOND,-1*%{%{Acct-Delay-Time}:-0},CAST('%S' AS datetime2)), \
  NULLIF('%{Acct-Session-Time}', NULL), '%{Acct-Authentic}', \
  '%{Connect-Info}', \
  ((%{%{Acct-Input-Gigawords}:-0} * POWER(2, 32)) + %{%{Acct-Input-Octets}:-0}), \
  ((%{%{Acct-Output-Gigawords}:-0} * POWER(2, 32)) + %{%{Acct-Output-Octets}:-0}), \
  '%{Called-Station-Id}', \
  '%{Calling-Station-Id}', \
  '%{Acct-Terminate-Cause}', \
  '%{Service-Type}', \
  '%{Framed-Protocol}', \
  NULLIF('%{Framed-IP-Address}', ''), 0)"

#######################################################################
# Group Membership Queries
#######################################################################
# group_membership_query        - Check user group membership
#######################################################################

# Use these for case insensitive usernames. WARNING: Slower queries!
# group_membership_query = "SELECT GroupName FROM ${usergroup_table} WHERE LOWER(UserName) = LOWER('%{SQL-User-Name}')"

group_membership_query = "SELECT GroupName FROM ${usergroup_table} WHERE UserName='%{SQL-User-Name}'"

#######################################################################
# Authentication Logging Queries
#######################################################################
# postauth_query                - Insert some info after authentication
#######################################################################
postauth_query = "INSERT INTO ${postauth_table} (username, pass, reply, authdate) \
  VALUES ('%{User-Name}', '%{%{User-Password}:-Chap-Password}', '%{reply:Packet-Type}', CURRENT_TIMESTAMP)"

Пробный запуск

Не забудьте поправить clients.conf, чтоб разрешить доступ к RADIUS-у со своей машины или NAS-а, и поправить radius.conf, где раскомментировать $INCLUDE sql.conf.

Запускаем radiusd -X и находим строки, где выполняется подключение SQL, убеждаемся, что нет ошибок с подключением. Иначе, используем tsql и isql для диагностики конфигурации FreeTDS и unixODBC.

Когда с подключением все в порядке, можете использовать какую-нибудь утилиту для тестирования RADIUS сервера, например NTRadPing. Пользователь для пробы - test123, пароль 12345.