AAA Authorization with ACS Shell-Sets

Question

Hi all,
I am using a cisco 871 router running Version 12.4(11)T advanced IP Services.
I am having trouble getting AAA Authorization to work correctly with ACS.
I am able to set the users up on ACS fine and assign them shell and priv level 7.
I then setup a Shell Auth Set, and enter in the commands show and configure.
When I log in as a user, I get an exec with a priv level of 7 no problems, but I never seem to be able
to access global config mode by typing in conf (or configure) terminal or t.
If I type con? the only command there is connect, configure is never an option...
The only way I can get this to work is by entering the command:
privilege exec level 7 configure terminal
I thought the whole purpose of the ACS Shell Set was to provide this information to the Router?
This is most frustrating
The ACS Server is set up with a Shell Command Authorization Set named Level_7
It is assigned to the relevant groups and I even have the "Unmatched Commands" option selected to "Permit"
The "Permit Unmatched Args" is also selected.
See an excerpt of my IOS config below:
aaa new-model
aaa group server tacacs+ ACS
server 10.90.0.11
aaa authentication login default group ACS local
aaa authorization exec default group ACS
aaa authorization commands 7 default group ACS local
tacacs-server host 10.90.0.11 key cisco
privilege exec level 7 configure terminal
privilege exec level 7 configure
privilege exec level 7 show running-config
privilege exec level 7 show
Hope you can help me with this one..
P.s I have tried it with the privilege commands on the router and removed from the router and just keep getting the same results!?

Answer 1

Hi,
So here it is,
You are actually using two different options and trying to couple then together. What I would suggest you is either use Shell command authorization set feature or play with privilege level. Not both mixed together.
Above scenario might work, if you move commands to privilege level 6 and give user privilege level 7. It might not sure. Give it a try and share the result.
This is what I suggest the commands back to normal level.
Below provided are steps to configure shell command authorization:
Follow the following steps over the router:
!--- is the desired username
!--- is the desired password
!--- we create a local username and password
!--- in case we are not able to get authenticated via
!--- our tacacs+ server. To provide a back door.
username password privilege 15
!--- To apply aaa model over the router
aaa new-model
!--- Following command is to specify our ACS
!--- server location, where is the
!--- ip-address of the ACS server. And
!--- is the key that should be same over the ACS and the router.
tacacs-server host key
!--- To get users authentication via ACS, when they try to log-in
!--- If our router is unable to contact to ACS, then we will use
!--- our local username & password that we created above. This
!--- prevents us from locking out.
aaa authentication login default group tacacs+ local
aaa authorization exec default group tacacs+ local
aaa authorization config-commands
aaa authorization commands 0 default group tacacs+ local
aaa authorization commands 1 default group tacacs+ local
aaa authorization commands 15 default group tacacs+ local
!--- Following commands are for accounting the user's activity,
!--- when user is logged into the device.
aaa accounting exec default start-stop group tacacs+
aaa accounting system default start-stop group tacacs+
aaa accounting commands 0 default start-stop group tacacs+
aaa accounting commands 1 default start-stop group tacacs+
aaa accounting commands 15 default start-stop group tacacs+
Configuration on ACS
[1] Goto 'Shared Profile Components' -> 'Shell Command Authorization Sets' -> 'Add'
Provide any name to the set.
provide the sufficent description (if required)
(a) For Full Access administrative set.
In Unmatched Commands, select 'Permit'
(b) For Limited Access set.
In Unmatched commands, select 'Deny'.
And in the box above 'Add Command' box type in the main command, and in box below 'Permit unmatched Args'. Provide with the sub command allow.
For example: If we want user to be only able to access the following commads:
login
logout
exit
enable
disable
show
Then the configuration should be:
------------------------Permit unmatched Args--
login permit
logout permit
exit permit
enable permit
disable permit
configure permit terminal
interface permit ethernet
permit 0
show permit running-config
in above example, user will be allowed to run only above commands. If user tries to execute 'interface ethernet 1', user will get 'Command authorization failed'.
[2] Press 'Submit'.
[3] Goto the group on which we want to apply these command authorization set. Select 'Edit Settings'.
(cont...)