[tac_plus] Cisco Nexus Authorization problem
Aaron Wasserott
aaron.wasserott at viawest.com
Wed Jul 22 19:28:20 UTC 2015
Kevin,
I just tested this and it works for me. User can run show commands, but not enter conf t mode.
Arista DCS-7050S-52-R running code 4.8.3. In production we run do_auth. It comes bundled with the latest version of tac_plus and makes tweaking authorization a lot easier. It’s more scalable, syntax is cleaner, and it has its own authorization logs which are easier to read.
# tac_plus.conf
group = tier1 {
default service = permit
login = PAM
pap = PAM
default command = deny
cmd = show {permit .*}
service = exec {
priv-lvl = 15
}
service = raccess {
priv-lvl = 0
}
}
user = first.last {
member = tier1
}
# switch AAA commands
aaa group server tacacs+ TacGroup
aaa authentication login default group TacGroup local
aaa authorization exec default group TacGroup none
aaa authorization commands 15 default group TacGroup none
aaa accounting exec default start-stop group TacGroup
aaa accounting commands 15 default start-stop group TacGroup
no aaa root
-Aaron
From: Kevin.Cruse at Instinet.com [mailto:Kevin.Cruse at Instinet.com]
Sent: Wednesday, July 22, 2015 12:44 PM
To: Aaron Wasserott
Cc: tac_plus at shrubbery.net
Subject: RE: [tac_plus] Cisco Nexus Authorization problem
Aaron
Do you have experience with Arista? It seems I am having similar problem with this device. Authentication works fine, but once i login and send enable password I can run any command i'd like. It's not restricting access to my preconfigured commands:
Arista1#sh run | i aaa
aaa group server tacacs+ CiscoACS
aaa authentication login default group CiscoACS local
aaa authorization exec default group CiscoACS local
aaa authorization commands all default group CiscoACS local
aaa accounting exec default start-stop group CiscoACS
aaa accounting commands all default start-stop group CiscoACS
no aaa root
-----
user = testuser {
login = clear "test123"
pap = clear "test123"
member = snm
}
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"
}
}
}
----
Arista1 login: testuser
Password:
Last login: Wed Jul 22 18:49:42 on ttyS0
Arista1>en
Password:
Arista1#conf t <--- This command should be restricted
Arista1(config)#interface eth 10 <--- This command should be restricted
Arista1(config-if-Et10)#shut <--- This command should be restricted
Arista1(config-if-Et10)#end
Arista1#exit
[Inactive hide details for Aaron Wasserott ---07/16/2015 09:26:32 PM---Try changing "service = shell" to "service = exec" and se]Aaron Wasserott ---07/16/2015 09:26:32 PM---Try changing "service = shell" to "service = exec" and see if that works. I have NX-OS working fine
From: Aaron Wasserott <aaron.wasserott at viawest.com<mailto:aaron.wasserott at viawest.com>>
To: "Kevin.Cruse at Instinet.com<mailto:Kevin.Cruse at Instinet.com>" <Kevin.Cruse at Instinet.com<mailto:Kevin.Cruse at Instinet.com>>, "tac_plus at shrubbery.net<mailto:tac_plus at shrubbery.net>" <tac_plus at shrubbery.net<mailto:tac_plus at shrubbery.net>>,
Date: 07/16/2015 09:26 PM
Subject: RE: [tac_plus] Cisco Nexus Authorization problem
________________________________
Try changing "service = shell" to "service = exec" and see if that works. I have NX-OS working fine using that. Also, I have never seen the shell service used in real-world examples for network devices. But reading the manpage it appears it should work to prevent them from entering configuration mode, as long as your AAA commands are set right.
service=shell
for exec startup, and also for command authorizations. Requires: aaa authorization exec tacacs+
Whether authorization happens, and at which prompt level, depends on the aaa authorization settings. It's possible to only restrict exec level commands, and prevent them from entering the 'conf t' command. But if you want them in conf t mode but restrict their commands at that level, you need to enable something like this:
aaa authorization config-commands default group myTacacsGroup local
If changing the service doesn't work, include the AAA commands on your NX-OS switches.
-----Original Message-----
From: tac_plus [mailto:tac_plus-bounces at shrubbery.net] On Behalf Of Kevin.Cruse at Instinet.com<mailto:Kevin.Cruse at Instinet.com>
Sent: Thursday, July 16, 2015 3:40 PM
To: tac_plus at shrubbery.net<mailto:tac_plus at shrubbery.net>
Subject: [tac_plus] Cisco Nexus Authorization problem
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.
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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