Cisco AAA/Identity/Nac :: ACS 5.3 / Tacacs Authorization Restrictions
Nov 14, 2012
ACS 5.3 configured with two rules, 1 rule for standard level 15 access for the Network Engineers and a 2nd rule to allow some limited access to switches: The limited access account has enough command set access to change the vlan on a switchport, so Configure Terminal, Interface FAx/x and switchport access vlan x.
Switch configuration:
aaa authentication login default group tacacs+ local
aaa authentication enable default group tacacs+ enable
aaa authorization console
aaa authorization config-commands
aaa authorization exec default group tacacs+ local
aaa authorization commands 0 default group tacacs+ local
aaa authorization commands 1 default group tacacs+ local
aaa authorization commands 15 default group tacacs+ local
aaa session-id common
Everything works well and the limited access users can only perform the commands i've setup.
Problem:The problem i've encountered is when one of the network engineers makes a change that would stop the device from being able to see the ACS server it stops allowing any commands to be typed in the router/switch. Additionally if you then connect to the device and login with the local username and password the device then waits for it to hit the TACACS server timeout for every command you enter. This is obviously very slow and painful for the engineer.
Question:Is there a way to set this up so the engineer logging in with full Level 15 access doesn't have to have each command authorized by the ACS server but still allow the limited access accounts to be able to make interface changes?
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Sep 13, 2011
I tried to configure TACACS+ authentication / authorization for NCS via ACS 4.2. For that I followed the configuration guide:
1. Configured the service for NCS with HTTP (see attachment)
2. Added the tasks to the user (see attachment)
When I try to login on the NCS it fails, in the logs on the NCS I see the following lines:
09/14/11 16:53:03.333 TRACE [system] [http-443-7] [TACACS+ AAAModule] Creating authorization socket - To Server: 192.168.49.14 - For User: netadmin
09/14/11 16:53:03.335 TRACE [system] [http-443-7] [TACACS+ AAAModule] Sending authorization request packet - To Server: 192.168.49.14 - For User: netadmin
09/14/11 16:53:03.336 TRACE [system] [http-443-7] [TACACS+ AAAModule] Receiving authorization response packet - From Server: 192.168.49.14 - For User: netadmin
[code].....
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Mar 4, 2012
I can get it to authenticate. But I've read some posts on ACS 4.2 and authorization, but I don't find anything similar.I want to control down to what commands the authenticated user can run. I want the defintion to come from the ACS server, or at least control it from the ACS server. I want to minimize the changes on the JunOS side,but if it can't be easily done, I'll change the JunOS side.
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Jan 15, 2012
Noticed tacacs authorization logs when you change password for a user ?? in authorization logs I can see the new password but same I can not see in accounting logs ? is it a normal behaviour ?? or do we need to do something to hide the password in authorization logs ?
For example if i type command username xyz priv 15 secret cisco 123
I see this command in accounting logs as uername xyz oriv 15 secret *** where as in tacacs authorization logs it shows username xyz priv 15 secret cisco 123
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Feb 2, 2012
We have a group in TACACS ACS4.2. I configure it can do show command. When logged, it can do show command some parameters, like show ip interface, but it cannot do show running-config. it says "command authorization failed".
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Feb 2, 2013
I am trying to configure ACS 5.2 to do all authentication against Microsoft AD, but use local identity groups to determine TACACS+ authorization.
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Jan 3, 2012
I am having an issue with authorization on the Nexus 5548. Note: The tacacs configuration has and still works correctly with all non-Nexus gear.
Authentication succeeds, and initiatial authorization passes. However, all sh and config commands fail, though AAA Autho Config-Commands .... and Commands Default Group <Grp Name), are configured.
ACS generates the following error: 13025 Command failed to match a Permit rule. The Selected Command Set is DenyAllCommands. I created an AllowAll, but am unclear how to associate this with Access Policy.
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Nov 5, 2011
provide a sample configuration to use Cisco Secure ACS 4.2 to enable command authorization using TACACS.
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Jan 3, 2012
While working in a 3560 all of a sudden I received the message "command authorization failed" while trying to issue certain commands.
It appears I lost my priv 15 authorization. We have seen this before, we do not have access to the ACS to trouble shoot the issue.I tried logging in a 2nd and 3rd time using tacacs and received the same error whenever I issued a command such as dir flash: , copy tftp flash or show run. At the time I was trying to copy IOS to the switch, I had a co-worker log in and it was fine for him and he completed the copy.
Once completed I logged back in and all was fine again. We suspect an issue with ACS? possibly a timeout of our TACACS authorization ?
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Dec 5, 2011
I'm looking for Cisco ISE v1.1 to use the following licensing feature. url...Endpoint is dynamically profiled by Cisco ISE and assigned dynamically or statically to an endpoint identity group. Cisco ISE authorization rules do not use this endpoint identity group.
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Mar 13, 2013
In our scenario, easy vpn users are being authenticated by acs 5.3 successfully. We have created seperate user group for these users. The issue is, these users are also able to access our routers using their username/password. I want to restrict this particular group so that its not able to access any device.
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Apr 26, 2011
I'm trying to set a VPN connection to a router using group authorization with the ACS 5.2 but cannot make it work. I configured everything based on the procedure used for ACS 4.2. I created a user that corresponds to the group name, used the password cisco and used all the requiered Cisco AV pairs in an authorization profile. (Based on document: [URL]
While testing with ACS 4.2 this works fine, I can see that the ACS returns the group attibutes correctly (here is a debug output)
Apr 9 16:16:59.256: RADIUS: Received from id 1645/22 192.168.1.212:1645, Access-Accept, len 203Apr 9 16:16:59.256: RADIUS: authenticator 02 07 F5 E6 46 78 73 CA - 46 6D 47 90 FE 92 38 9AApr 9 16:16:59.256: RADIUS: Vendor, Cisco [26] 30 Apr 9
[Code].....
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May 9, 2011
Have a conceptual question bout CLI command authorization. We have ASC 5.2 up and running, providing AAA services for network devices. Now I need to make profiles for users in certain group to restrict dem CLI "rights" to show, clear counters and show running-config commands. I need to accomplish dis task.I should clrete separate privillege levele profile (let it be 2), specify commands at this level, assign Group this Authorization Prifile and make some additional changes in my devices.
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Aug 2, 2012
what's the ACS 5.3 common configuration for authorization profile for RAS authorization ?
I have an authorization error and the customer needs PPP, LCP, ip pool (configured on the ras).
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Feb 27, 2011
I am in the process of setting up an ACS evaluation that will authenticate against a Windows 2003 AD. I am currently testing this with AAA TACACS+ but will evenutally setup 802.1x authentication. My problem however seems to be between the ACS and AD.
I have the AD External Identity store configured and successfully tested for connectivity. I created a shell profile and a command set and also created an access ploicy for Device Admin. I added the AAA commands to my test switch and do get prompted for username and password. This is where my issue starts. Regardless of what username and passwword I enter, I always fail authentication. At least that is what is in the reports and I have 0 hits on my Access and Authorization policy rule. I am using as basic as a config as I can get with simply using a contains from one of the groups I am in for the policy rule. I had a non-AD admin account to start with thinking maybe a rights issue with the AD account but have moved to an AD admin account with no change in the results. I saw a post somewhere that the time stamps on the AD server and the ACS had to almost be perfect and recommended that NTP for ACS be the AD server as that could cause issues and I have done that as well with no change. I am wondering if there is something specific I needed to configure or something I missed between the ACS and the AD? Is there a way I can display what is passed back and forth between the ACS, or the switch, and AD to verify content? I put a call into my local SE and he is as puzzled as I am.
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Jul 24, 2012
i have create a one profile on PIX/ASA Command Authorization Sets & MAP with Group & Ldap with My AD. but authentication is not done as per the set parameter on command authorization in ACS.i am using Cisco ASA 5505 & ACS 4.2.
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Jun 8, 2011
I have IAS set up on my organization's AD domain controller. Multiple policies set up for various authorization scenarios, authenticating based on Windows user groups and client IP, authorizing by passing "shell:priv-lvl=#" where #=desired privilege level. On my IOS devices I have:[code]
This identical configuration operates correctly on a Cisco 3825 and a Catalyst 4506. On the 24 port Cat 3560G PoE running 12.2SE (do not recall exact IOS version, but I know it is in that release train) that I am currently working on, every attempt to login via ssh passes authentication but fails authorization, displaying %Authorization Failed on the terminal and a message stating that "No appropriate privilege level found for user" in the debug statement from RADIUS.I have verified correct server addresses, correct source-interfaces, and that configs between the three devices match exactly with regards to aaa.
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May 5, 2013
In the process of migrating from ACS 4.1 to ACS 5.3. Authentication works fine, but having issues with authorization on the Juniper WXC-3400 devices. In ACS 4.1 we were passing TACACS+Shell (exec) Custom attributes Privilege level=15, which allowed a user to login with read/write privileges. In ACS 5.3 tried setting the Shell Profiles common task to 15 for both Default and Maximum (one at a time, and together), as well as setting the Custom Attributes for priv-lvl=15 (with and without Common Tasks set).
A capture shows Auth Status: 0x11 (ERROR).
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Nov 19, 2012
I am trying to move my ISDN dialup branches authentication/authorization from old ACS 4.1 to ISE appliance. Before it was through ACS 4.2 with TACACS protocol but now since we are moving to ISE we are moving them to ISE with radius.
Problem is that isdn client gets authenticated and authorized but calls get dropped and they dont able to communicate with HO. IP address is assigned by Head End router to all remote isdn dialing branches..
I have used default "PermitAccess" in authorization policy and authentication policy is also default. I dont understand where I am going wrong as authentication and authorization is sucessful.
aaa authentication ppp default group radius local
aaa authentication network default group radius
aaa accounting network default start-stop group radius
radius-server host 12.18.22.41
radius-server key *****
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Apr 5, 2011
1 ) : Is it possible to do authentication with one ACS server while authorization with another ACS? Use case is if the user authenticated to one ACS server and then switch loses the connectivity to this ACS. Now command authorization requests will go to another ACS server since switch is not able to communicate to the 1st ACS.
2): How can the local database sync be acheived in distributed ACS deployments?
3): Are the accounting records are sync between different ACS? In other words can accounting be centeralised with ACS4.2
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Mar 4, 2012
I have a Cisco ASA (8.2) setup with remote access for my users using Cisco VPN client. The authentication is passed off to my ACS 5.3 which then checks with AD. What I've done so far is create Access Policy rule where I define specifically the Location and NDG where the ASA is and then a DenyAllCommands command set. This should pass authentications just fine but this also gives those users the ability to remote connect directly into the ASA and login successfully. Even though there is a Deny Commands there I still would prefer they get Access Denied as a message. If I do a Deny Access on the ShellProfile then this stops the login authentication altogether.
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May 24, 2011
I think i've got everything set up to authenticate against AD for Tacacs+ device logins. When i check the logs, i see:"24408 User authentication against Active Directory failed since user has entered the wrong password". This leads me to believe that it is checking AD correctly, however if i enter the password correctly for the same AD user, there is no log at all...no pass, no fail.
If i look at the Tacacs debugs on the switch, i see the following:May 25 10:55:07.927 CDT: TAC+: ver=192 id=874699084 received AUTHEN status = ERRORMay 25 10:55:09.932 CDT: TAC+: send abort reason=Unknown
Obviously the switch is communicating to ACS, and ACS is passing info back to the switch. ACS also appears to be communicating effectively with AD since it knows when i put in an incorrect password for the specific user.
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Aug 23, 2012
A short background. Our corporate SSID is being migrated from using PEAPv0 to EAP-TLS. This restricts access only to company notebooks. Additionally we have barcode scanners which are used to inventory assets. Those devices are not able to use EAP-TLS as they cannot be integrated in the domain and being unable to do certificate based authentication.
As a workaround we planned to use another SSID with access to the same network but using PEAPv0 as authentication method, basically the same SSID but with a different name. As this naturally allows anyone to access the corporate network with a valid username/password I now wanted to add another step into the authentication process - the MAC of the device. I know I can do the filtering at the WLAN controller, but as it has a limited database as well as the fact that it is cumbersome to maintain the MAC list on all the controllers I thought I can do it over our ACS system.
I am now trying to accomplish the following: The user gets authenticated via the internal user store, which is succesful. Now I want to authorize the user via the MAC address, which is stored in the internal host store of the ACS, if access is granted or not.
For this I created the following policy:
Service Selection Policy -- (Rule based result selection)
-- (NDG:Device Type in All Device Types:Wireless And RADIUS-IETF:Called-Station-ID contains <SSID>) | Result: PEAP access
-- Default | Result: DenyAccess
Service PEAP access Identity: Internal Users -- (Single result selection) Authorization -- (Rule based result selection) -- Internal Hosts:HostIdentityGroup in All Groups:Valid_MACs
When I then try to access the wireless network I won't get authenticated. The error I get, when I look into the logs is: 15039 Selected Authorization Profile is DenyAccess
Is it not possible to use one identity store as "attribute database" for the other identity store?
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Apr 17, 2013
For ACS 5.4: In Network Access -> Authorization Profiles there is a Permit Access profile. If you try to edit it a message pop's up that says: "The profile you have selected is reserved and cannot be deleted or modified". What this profile contains in its rule base? If I wanted to create a similar profile what Common Tasks, or Radius Attributes would I need to use? The same would go for a Deny Access profile. I have looked at the Common Tasks and Radius Attributes for a new profile and it doesn't seem very intuitive.
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Dec 5, 2012
I am gettning warning messages in ISE saying
Cause:Dynamic Authorization Failed for Device: 0002SWC003 (switch)Details:Dynamic Authorization Failed
It is not only on that switch but on all switches I have configured. I am using 3560 IPBase 12.2(55)SE6. I have configured them according to Trustsec 2.1. My end devices are none-802.1x. I can't figure out what is causing this error.
The thing is that I have not experienced any problem. In Live Authentications there are some 'Unknown' and 'Profiled' devices hitting the DenyAccess rule, but other then that everying is beeing Authorized fine.
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Jan 6, 2013
Using ISE 1.1.1 and Switch 3650 12.2(55)SE6. I have a client (computer) that should be authenticated with MAB and then the switch port should be asigned a DACL and VLAN 90. I do get "Authorization succeeded" but directly after it fails and I can't figure out why. ISE only shows the successful authentication under "Live Authentications".
As you can se from the log below 802.1x fails, as it should, and then MAB succeed, asigns the VLAN and then fails:
0002SWC002(config)#int fa0/13
0002SWC002(config-if)#shut
0002SWC002(config-if)#
[Code]....
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Jun 1, 2011
I am setting up Radius AAA for cat6K switch.For authentication its work and user can login to switch. But for the privilege level assignment, it does not work. After loging in, I always get privilege 1. I need your guide on how to configure on ACS 5.1, RADIUS Attribute.I follow the document to configure the cisco-av-pair for assign Privilege 15 and Privilege 5 , but it does not work.This attribute format was shown in document is to set Privilege 15, "shell:privlvl=15" it is correct way of configure it on ACS 5.1
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Sep 10, 2012
I have an ASA 5520 8.2(5) with ACS 5.1, I made the configutation of Authentication and is working well, now how I can configure the authorization and get into the privileged level 15 mode directly.
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Nov 22, 2012
I have defined Radius proxy on csg2 to external radius server, but pdp fails with Authorization failure message on GGSN and on Csg2 debut log I see “SAMI 3/3: Nov 23 15:11:43.937: RADIUS: Dropping the unsolicited RADIUS packet”
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Nov 25, 2011
I am trying to solve this problem without success so far. I have fresh ACS 4.2.15 patch 5 ACS installation and I am tryng to deploy it to our environment. So I have configured one 2960S to be my test client and everything works fine. Problem is when I try to create fine grained policies using network device groups and shell authorization sets.
I have created shell authorization sets called ReadOnly and FullAccess. I have also created NDG called FloorSwitches and added my 2960. I have 2 user groups called FloorSwitchesReadOnly and FloorSwithcesFullAccess. Now, if I configure group FloorSwitchesFullAccess and assign Shell command authorization set per NDG and then log into the switch, all of my commands are refused as unauthorized.
One thing that I have noticed is that if I assign shell command authorization set to any device ( in user group settings ) it works fine. Or if I create association with DEFAULT NDG in user group it also works. So my conclusion is that ACS for some reason does not associate my switch with correct group but rather puts it to DEFAULT group for some reason.
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Feb 27, 2011
I found that TACACS should be available for network access with ACS 5.2:(url) But when I'm trying to create Rule tu allow PPP authentication against TACACS server I get error.
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Sep 20, 2011
I am running ACS 4.1.1.23 on a Microsoft server and I am trying to get TACACS to work with two Linux servers. The servers are capable of TACACS, are using port 49 and have the correct shared secret. I believe I do not have the devices configured properly on the ACS side. These 2 servers currently are using RADIUS and we are getting bit by the bug where the ACS application will start rejecting RADIUS authentication requests but still accept TACACS requests.
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May 14, 2013
I am setting up reports for tacacs accounting on ACS 5.3. However, accounting only seems to work after entering enable mode on the switch. I would like to see all commands, even the enable command when in privlage 1 mode.
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