AAA на примере FreeRadius

AAA на примере FreeRadius

AAA

A

A

A

local LDAP Kerberos RADIUS TACACS+ SSO

RADIUS-server <---> NAS <---> user

freeradius

apt-get install freeradius

NAS:

/etc/freeradius/clients.conf

client 10.13.0.2 {
    ipaddr = 10.13.0.2
    secret = testing123
}

Пользователи:

/etc/freeradius/users

cisco Cleartext-Password := "ciscocisco"

service freeradius stop
freeradius -X

Проверка:

root@model-net-ctrl-1:~# radtest cisco ciscocisco 127.0.0.1 0 testing123
Sending Access-Request of id 118 to 127.0.0.1 port 1812
        User-Name = "cisco"
        User-Password = "ciscocisco"
        NAS-IP-Address = 212.192.64.218
        NAS-Port = 0
        Message-Authenticator = 0x00000000000000000000000000000000
rad_recv: Access-Accept packet from host 127.0.0.1 port 1812, id=118, length=20

Cisco IOS

default config

Начальная конфигурация коммутатора для работы выглядит так

!
service timestamps log datetime msec localtime show-timezone year
!
enable secret 5 $1$eII1$tBNEV9R6Gzy2cr/9rAaxk1
!
username cisco1 secret 5 $1$d08J$pSSW3WfregkPKjYJAWjyX0
no aaa new-model
clock timezone GMT+6 6 0
!
vlan internal allocation policy ascending
!
vlan 88
!
interface range FastEthernet0/1 - 24
 switchport access vlan 88
 switchport mode access
 spanning-tree portfast
!
interface Vlan88
 ip address 212.192.88.150 255.255.255.0
 no shut
!
ip default-gateway 212.192.88.1
!
line vty 0 15
 logging synchronous
 login local
!
ntp server 212.192.64.2

AAA new-model

aaa new-model 
!
radius-server host 212.192.64.174 auth-port 1812 acct-port 1813 timeout 2 retransmit 1 key superciscosecret
!
aaa group server radius RAD-GROUP
 server 212.192.64.174 auth-port 1812 acct-port 1813
!         
aaa authentication login ADMINUSERS group RAD-GROUP local
! new login auth-list “ADMINUSERS” with local fallback
!
aaa authentication enable default enable
! use enable password to enter enable mode in default auth-list
!
!
line vty 0 15
  login authentication ADMINUSERS
!

freeradius

client switch150 {
    ipaddr = 212.192.88.150
    secret = superciscosecret
}

Диагностика

term mon
debug radius
test aaa group RAD-GROUP cisco ciscocisco port 1 new-code
un all
term no mon

При выключенном сервере коммутатор после 4 попыток перейдет на локальную аутентификацию. Т.е. без радиус-сервера мы по прежнему можем попасть на коммутатор под локальным пользователем.