Hi Cisco People
I'm using FreeRadius 2 and Cisco 2600 Terminal server to coordinate access to cisco routers based on time ranges.
Basically we are an education/training environment where we have some students accessing the routers and switches for practise, terminal server are used to consolidate the console access, and these terminal servers authenticate the users through a Radius server (as shown in the following figure). Additionally, the students are categorized into few groups. We want to implement policy on the radius server so that only a certain group can access the resources in a given duration of time (the user should be dropped from the terminal when the subscribed time is reached and cannot access thereafter .)
+++++++++++++++ +++++++++++++++++ +++++++++++++
+ User +++++++++++++++++++++++ Cisco 2600 +++++++++++++++++++++ Network +
+ + + Terminal Serv + + Devices +
+++++++++++++++ +++++++++++++++++ +++++++++++++
(NAS)
+
+
+++++++++++++++
+ FreeRadius +
+++++++++++++++
Right now I'm able to do the "hello-world" setup with the following users and clients.conf. On the terminal server side, aaa new-model is enabled on the cisco terminal server to communicate with this radius server.
users
=============
cisco Auth-Type := System
Service-Type = NAS-Prompt-User,
cisco-avpair = "shell:priv-lvl=15"
clients.conf
==============
client 192.168.1.1 {
secret = SECRET_KEY
shortname = termserver
nastype = cisco
}
A typical transaction would be :
Access-Request
=======
NAS-IP-Address = 192.168.1.1
NAS-Port = 35
NAS-Port-Type = Async
User-Name = "cisco"
Calling-Station-Id = "1.1.1.1"
User-Password = "cisco"
Service-Type = NAS-Prompt-User
Cisco-AVPair = "shell:priv-lvl=15"
This works fine but doesn't provide any timing limitations. So I have modified the FreeRadius config to be :
users
=============
cisco Auth-Type := System
Service-Type = NAS-Prompt-User,
cisco-avpair = "shell:priv-lvl=15",
Session-Timeout = 20
Cisco Terminal Server
==============
aaa new-model
aaa authentication login default group radius local none
aaa authorization exec default group radius if-authenticated
aaa accounting exec default start-stop group radius
aaa accounting network default start-stop group radius
aaa accounting connection default start-stop group radius
After this, I am able to see that the terminal server actually receives an Access-Accept including the Session-Timeout attributes like the following :
Service-Type = NAS-Prompt-User
Cisco-AVPair = "shell:priv-lvl=15"
Session-Timeout = 20
But the problem is that it doesn't really terminate the session after the 20 seconds are reached . My questions is that :
1. Is the terminal server really able to enforce such time limit after receiving the attribute ?
2. Is the 2600 terminal server with [IOS 12.1(3)T] compliant with RFC 2865?
3. What can I do so that the terminal server forces the user to be logged out after the session time limit is reached ?
Thanks
Frank
