[tac_plus] Cisco Nexus Authorization problem
Alan McKinnon
alan.mckinnon at gmail.com
Fri Jul 17 08:31:12 UTC 2015
On 16/07/2015 23:39, Kevin.Cruse at Instinet.com wrote:
>
>
> Hello
>
> I have configured TACPLUS to work with cisco nexus device. I am able to
> successfully authenticate, however, I am able to run all commands on
> router. It seems the router is not restricted to the commands specified in
> my group config. Has anyone gotten Cisco nexus to work properly with
> tacplus? I need to limit certain users and cannot get this working
> properly. Any help is greatly appreciated!!! Thanks.
I couldn't get command auth to work properly on Nexus either. Also, my
colleagues in NetOps assured me the command list was more complex and
more involved and trickier for NX-OS than plain ios.
Our solution was to implement the roles we needed on the Nexus itself
and send the role as an AV pair back from the tacacs server. The
architecture of the 5000 and 9000 we used made this simple to manage.
>
> Group Config:
>
> group = snm {
> default service = deny
> service = shell {
> set shell:roles="\"network-admin\""
> default command = deny
> default attribute = deny
> set priv-lvl = 15
> cmd = configure {deny .*}
> cmd = clear {
> permit "counters"
> permit "qos stat"
> permit "mls qos int"
> }
> cmd = disable {permit .*}
> cmd = enable {permit .*}
> cmd = end {permit .*}
> cmd = exit {permit .*}
> cmd = logout {permit .*}
> cmd = ping {permit .*}
> cmd = set {
> permit "length 0"
> }
> cmd = show {
> deny "controllers vip"
> permit .*
> }
> cmd = skip-page-display {permit .*}
> cmd = terminal {
> permit "length 0"
> }
> cmd = write {
> permit "network"
> permit "terminal"
> permit "memory"
> }
> }
> }
>
>
> user = testuser {
>
> member = snm
> }
>
>
> Session output from router:
>
> telnet labrouter
> Trying labrouter...
> Connected to labrouter.
> Escape character is '^]'.
> User Access Verification
> login: testuser
> Password:
> Cisco Nexus Operating System (NX-OS) Software
> TAC support: http://www.cisco.com/tac
> Copyright (c) 2002-2014, Cisco Systems, Inc. All rights reserved.
> The copyrights to certain works contained in this software are
> owned by other third parties and used and distributed under
> license. Certain components of this software are licensed under
> the GNU General Public License (GPL) version 2.0 or the GNU
> Lesser General Public License (LGPL) Version 2.1. A copy of each
> such license is available at
> http://www.opensource.org/licenses/gpl-2.0.php and
> http://www.opensource.org/licenses/lgpl-2.1.php
> LABROUTER# configure
> <------------------------------------------------------------ This should
> be denied
> Enter configuration commands, one per line. End with CNTL/Z.
> LABROUTER(config)# interface ethernet 1/1 configure
> <------------------------------------------------------------ This should
> be denied
> LABROUTER(config-if)# shut
> <------------------------------------------------------------ This should
> be denied
> LABROUTER(config-if)# no shut
> <------------------------------------------------------------ This should
> be denied
> LABROUTER(config-if)# end
> LABROUTER#
>
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--
Alan McKinnon
alan.mckinnon at gmail.com
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