[c-nsp] AAA on IOS-XR (NCS540)

[Eric Van Tol]

Ok, so it’s essentially adding in something like an iptables entry. Is there any need to use an ACL on the VTY lines anymore when using the peer config? I personally like the ACL instead because then I don’t need to define the peer addresses on every port I want access from, but maybe I’m doing it wrong.

BTW – I ended up deleting my AAA config and adding it back and now it magically works and I can log in via console as the local admin user:

aaa authorization exec CONSOLE local
aaa authorization exec default group TACACS local
aaa authentication login CONSOLE local line
aaa authentication login default group TACACS line
!
line console
secret 5 ******
authorization exec CONSOLE
login authentication CONSOLE
!

From: Scott Miller <fordlove at gmail.com>
Date: Thursday, December 3, 2020 at 5:11 PM
To: Eric Van Tol <eric at atlantech.net>
Cc: Aaron <dudepron at gmail.com>, "cisco-nsp at puck.nether.net" <cisco-nsp at puck.nether.net>
Subject: Re: [c-nsp] AAA on IOS-XR (NCS540)


EXTERNAL - Do not click links or open attachments from an unverified source/sender.
control-plane is like an access-list, only the specified IP's will be able to ssh to the box.

On Thu, Dec 3, 2020 at 12:32 PM Eric Van Tol <eric at atlantech.net<mailto:eric at atlantech.net>> wrote:
Yes, that was a copy-paste typo.

From: Aaron <dudepron at gmail.com<mailto:dudepron at gmail.com>>
Date: Thursday, December 3, 2020 at 2:18 PM
To: Eric Van Tol <eric at atlantech.net<mailto:eric at atlantech.net>>
Cc: Scott Miller <fordlove at gmail.com<mailto:fordlove at gmail.com>>, "cisco-nsp at puck.nether.net<mailto:cisco-nsp at puck.nether.net>" <cisco-nsp at puck.nether.net<mailto:cisco-nsp at puck.nether.net>>
Subject: Re: [c-nsp] AAA on IOS-XR (NCS540)


EXTERNAL - Do not click links or open attachments from an unverified source/sender.
This isn't at typo is it?

aaa authentication login default group TACACS line!

should it be
aaa authentication login default group TACACS line   <<< no !

On Thu, Dec 3, 2020 at 2:13 PM Eric Van Tol <eric at atlantech.net<mailto:eric at atlantech.net>> wrote:
No, all I have is:

control-plane
management-plane
  inband
   interface TenGigE0/0/0/27
    allow all
   !
   interface TenGigE0/0/0/23.1550
    allow all
   !
   interface TenGigE0/0/0/25.1550
    allow all
   !
  !

What exactly does this do? I mean, I have an inkling, but I wouldn’t expect TACACS to work at all if I was missing a config to allow it to respond to the router.

From: Scott Miller <fordlove at gmail.com<mailto:fordlove at gmail.com>>
Date: Thursday, December 3, 2020 at 1:52 PM
To: Eric Van Tol <eric at atlantech.net<mailto:eric at atlantech.net>>
Cc: "cisco-nsp at puck.nether.net<mailto:cisco-nsp at puck.nether.net>" <cisco-nsp at puck.nether.net<mailto:cisco-nsp at puck.nether.net>>
Subject: Re: [c-nsp] AAA on IOS-XR (NCS540)


EXTERNAL - Do not click links or open attachments from an unverified source/sender.
Do you have the control-plane set up?

tacacs source-interface Loopback100 vrf default
tacacs-server host 11.11.11.11 port 49
 key 7 xxxxxxxxxxxxxxxxxxxxxxxx
!
tacacs-server host 22.22.22.22 port 49
 key 7 xxxxxxxxxxxxxxxxxxxxxxxx
!

aaa accounting exec default start-stop group acs-tacacs
aaa accounting system default start-stop group acs-tacacs
aaa accounting commands default start-stop group acs-tacacs
aaa group server tacacs+ acs-tacacs
 server 11.11.11.11
 server 22.22.22.22
!
aaa authorization exec default group acs-tacacs local
aaa authorization commands default group acs-tacacs none
aaa authentication login default group acs-tacacs local

line console
 exec-timeout 10 0
!
line default
 password 7 xxxxxxxxxxxxxxxxxxxxxxxxxxxx
 exec-timeout 30 0
 session-timeout 30
 transport input ssh
!
vty-pool default 0 20

control-plane
 management-plane
  inband
   interface all
    allow all peer
     address ipv4 11.12.12.12
     address ipv4 11.13.13.13
     address ipv4 11.14.14.14



On Thu, Dec 3, 2020 at 11:33 AM Eric Van Tol <eric at atlantech.net<mailto:eric at atlantech.net><mailto:eric at atlantech.net<mailto:eric at atlantech.net>>> wrote:
Hi all,
I’m going nuts here trying to get my AAA set up on an NCS. The goal is to authenticate against TACACS on VTY lines but either use the local user database or line/enable for console access and I cannot get it right. Sometimes my VTY authentication fails the first time and it requires you to put in your password a second time, even though the TACACS servers are definitely available. I cannot get console access to work properly at all. I’m running XR 7.1.1. Here’s the aaa portion of the config:

tacacs source-interface Loopback1 vrf default
tacacs-server host 192.168.45.126 port 49
key 7 ******
single-connection
!
tacacs-server host 192.168.46.126 port 49
key 7 ******
timeout 3
single-connection
!
username admin
group root-lr
group cisco-support
secret 10  $secretpass
!
aaa group server tacacs+ TACACS
server 192.168.45.126
server 192.168.46.126
!
aaa authorization exec CONSOLE local
aaa authorization exec default group TACACS local
aaa authentication login CONSOLE local line
aaa authentication login default group TACACS line!
!
line console
password 7 ******
authorization exec CONSOLE
login authentication CONSOLE
!
line default
password 7 ******
timeout login response 30
authorization exec default
login authentication default
exec-timeout 0 0
access-class ingress access-protect
session-timeout 120
transport input ssh
!

I’ve tried different permutations of the line console config and can’t get the right combination. Can someone point me in the right direction here?

Thanks in advance,
evt

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