[tac_plus] Tacacs host key and do_auth questions

Wed Mar 16 15:52:49 UTC 2016

Hi All

I have a few questions regarding host keys and do_auth.

First, I have a few routers i'd like to configure with a separate
'tacac-server key' than rest of our network.  These devices require
external users to access and therefore will need higher level of security.
In my tac_plus.cfg i have the global configuration of:

key = blahblahblah

and the individual routers which require different key, i've configured the
following in tac_plus.cfg:

host = 1.1.1.1 {
	key = differentkey
	}

The issue I have is when logging into router with separate key, it fails
authentication as server is expecting 'blahblahblah' but router is sending
'differentkey'. I thought by configuring the 'host' object it would
override the global key. Does anyone know how I may get this to work? I've
pasted the debug from server for your review

tac_plus.cfg

key = blahblahblah

host = 1.1.1.1 {
	key = differentkey
	}

Debug output:

!! ROUTER 1.1.1.1 is configured with "tacacs-server key differentkey" !!
Reading config
Version F4.0.4.28 Initialized 1
tac_plus server F4.0.4.28 starting
socket FD 4 AF 2
uid=0 euid=0 gid=0 egid=0 s=15505120
session request from 1.1.1.1 sock=5
connect from 1.1.1.1 [172.28.10.124]
Waiting for packet
Read AUTHEN/START size=40
validation request from 1.1.1.1
PACKET: key=blahblahblah
version 192 (0xc0), type 1, seq no 1, flags 0x1
session_id 2825152057 (0xa8646639), Data length 28 (0x1c)
End header
type=AUTHEN/START, priv_lvl = 72
action=UNKNOWN 132
authen_type=unknown 215
service=unknown 219
user_len=208 port_len=45 (0x2d), rem_addr_len=0 (0x0)
data_len=61
AUTHEN/START data length (314) exceeds packet length length 20
1.1.1.1 : Invalid AUTHEN/START packet (check keys)
Writing AUTHEN/ERROR size=87
PACKET: key=blahblahblah
version 192 (0xc0), type 1, seq no 2, flags 0x1
session_id 2825152057 (0xa8646639), Data length 75 (0x4b)
End header
type=AUTHEN status=7 (AUTHEN/ERROR) flags=0x0
msg_len=69, data_len=0
msg:
1.1.1.1 : Invalid AUTHEN/START packet (check keys)
data:
End packet
1.1.1.1: disconnect

Second, I have the following configured in do_auth.ini (this is a separate
issue from tacacs-server key and not related...when I normalize the key on
router to blahblahblah I get the following after successful
authentication):

[users]
test_support =
        support
[support]
host_allow =
    10.10.10.1
device_permit =
    1.1.1.1
command_permit =
    .*

2016-03-16 11:36:56: User 'test_support' not allowed access to device
'1.1.1.1' in 'support'->'device_permit'

I thought by adding the router IP address of 1.1.1.1 under device_permit it
should allow user to send commands. I am wondering if im hitting bug?

Any ideas, thoughts, suggestions greatly appreciated. Thanks.

Kevin

-----------------------------------------------------------------
Kevin Cruse
US Networks
Instinet LLC
309 West 49th Street
New York, NY 10019 US
kevin.cruse at instinet.com
212-310-4734

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