[tac_plus] Cisco Nexus Authorization problem
Kevin.Cruse at Instinet.com
Kevin.Cruse at Instinet.com
Mon Aug 17 16:21:41 UTC 2015
I am having a strange issue where cisco devices are being authorized by
do_auth properly, however, arista devices are not. The arista device is
sending command to tacplus but daemont does not send command to do_auth. I
can confirm since there is no update to do_auth log when sending commands
from arista. any ideas? Everything seems to be working fine except arista,
this is my last hurdle!
CISCO
connect from test.router.com [10.11.128.30]
Waiting for packet
Read ACCT size=137
validation request from test.router.com
PACKET: key=password
version 192 (0xc0), type 3, seq no 1, flags 0x1
session_id 677254324 (0x285e14b4), Data length 125 (0x7d)
End header
ACCT, flags=0x4 method=6 priv_lvl=1
type=1 svc=1
user_len=6 port_len=6 rem_addr_len=14
arg_cnt=6
User:
testuser
port:
tty130
rem_addr:
10.12.144.108
arg[0]: size=13
task_id=41325
arg[1]: size=12
timezone=EDT
arg[2]: size=13
service=shell
arg[3]: size=21
start_time=1439827839
arg[4]: size=10
priv-lvl=0
arg[5]: size=15
cmd=enable <cr>
End packet
Writing ACCT size=17
PACKET: key=password
version 192 (0xc0), type 3, seq no 2, flags 0x1
session_id 677254324 (0x285e14b4), Data length 5 (0x5)
End header
ACCT/REPLY status=1
msg_len=0 data_len=0
msg:
data:
End packet
test.router.com: disconnect
session request from test.router.com sock=5
connect from test.router.com [10.11.128.30]
Waiting for packet
Read AUTHOR size=104
validation request from test.router.com
PACKET: key=password
version 192 (0xc0), type 2, seq no 1, flags 0x1
session_id 4255328848 (0xfda32a50), Data length 92 (0x5c)
End header
type=AUTHOR, priv_lvl=15, authen=1
method=none
svc=0 user_len=6 port_len=6 rem_addr_len=14
arg_cnt=4
User:
testuser
port:
tty130
rem_addr:
10.12.144.108
arg[0]: size=13
service=shell
arg[1]: size=13
cmd=configure
arg[2]: size=16
cmd-arg=terminal
arg[3]: size=12
cmd-arg=<cr>
End packet
Writing AUTHOR/FAIL size=18
PACKET: key=password
version 192 (0xc0), type 2, seq no 2, flags 0x1
session_id 4255328848 (0xfda32a50), Data length 6 (0x6)
End header
type=AUTHOR/REPLY status=16 (AUTHOR/FAIL)
msg_len=0, data_len=0 arg_cnt=0
msg:
data:
End packet
authorization query for 'testuser' tty130 from test.router.com rejected
test.router.com: disconnect
ARISTA
connect from Aristalab-1.router.com [10.15.10.18]
Waiting for packet
Read ACCT size=119
validation request from Aristalab-1.router.com
PACKET: key=password
version 192 (0xc0), type 3, seq no 1, flags 0x1
session_id 1744489531 (0x67facc3b), Data length 107 (0x6b)
End header
ACCT, flags=0x4 method=6 priv_lvl=1
type=1 svc=1
user_len=6 port_len=5 rem_addr_len=0
arg_cnt=6
User:
testuser
port:
ttyS0
rem_addr:
arg[0]: size=10
task_id=22
arg[1]: size=13
service=shell
arg[2]: size=10
priv-lvl=1
arg[3]: size=21
start_time=1439828055
arg[4]: size=12
timezone=UTC
arg[5]: size=15
cmd=enable <cr>
End packet
Writing ACCT size=17
PACKET: key=password
version 192 (0xc0), type 3, seq no 2, flags 0x1
session_id 1744489531 (0x67facc3b), Data length 5 (0x5)
End header
ACCT/REPLY status=1
msg_len=0 data_len=0
msg:
data:
End packet
Aristalab-1.router.com: disconnect
session request from Aristalab-1.router.com sock=5
connect from Aristalab-1.router.com [10.15.10.18]
Waiting for packet
Read ACCT size=132
validation request from Aristalab-1.router.com
PACKET: key=password
version 192 (0xc0), type 3, seq no 1, flags 0x1
session_id 1288212585 (0x4cc89069), Data length 120 (0x78)
End header
ACCT, flags=0x4 method=6 priv_lvl=15
type=1 svc=1
user_len=6 port_len=5 rem_addr_len=0
arg_cnt=6
User:
testuser
port:
ttyS0
rem_addr:
arg[0]: size=10
task_id=23
arg[1]: size=13
service=shell
arg[2]: size=11
priv-lvl=15
arg[3]: size=21
start_time=1439828061
arg[4]: size=12
timezone=UTC
arg[5]: size=27
cmd=configure terminal <cr>
End packet
Writing ACCT size=17
PACKET: key=password
version 192 (0xc0), type 3, seq no 2, flags 0x1
session_id 1288212585 (0x4cc89069), Data length 5 (0x5)
End header
ACCT/REPLY status=1
msg_len=0 data_len=0
msg:
data:
End packet
Aristalab-1.router.com: disconnect
tac_plus.cfg:
group = snm {
default service = permit
service = exec {
priv-lvl = 15
}
after authorization
"/usr/bin/python /usr/local/sbin/tacplus/do_auth.py -i $address
-fix_crs_bug -u $user -d $name -l /var/log/tacacs/do_auth_log.txt
-f /usr/local/sbin/tacplus/do_auth.ini"
}
do_auth.ini:
[snm]
host_allow =
.*
device_permit =
.*
command_deny =
configure.*
show controllers vip.*
command_permit =
show ip.*
show interface.*
clear counters.*
clear qos stat.*
clear mls qos int.*
disable.*
enable.*
end.*
exit.*
logout.*
ping.*
set length.*
show.*
skip-page-display.*
write network.*
write terminal.*
write memory.*
terminal length.*
From: John Fraizer <john at op-sec.us>
To: "Kevin.Cruse at Instinet.com" <Kevin.Cruse at instinet.com>,
Cc: Daniel Schmidt <daniel.schmidt at wyo.gov>,
"tac_plus at shrubbery.net" <tac_plus at shrubbery.net>
Date: 08/07/2015 12:54 PM
Subject: Re: [tac_plus] Cisco Nexus Authorization problem
Here is one problem:
cmd exit does not exist, denied by default
It looks like you've got default service = deny in your tac_plus.conf. To
use do_auth, you need default service = permit.
Your after auth line doesn't look right either.
/usr/bin/python /usr/local/sbin/tacplus/do_auth.py -u $user
-l /var/log/tacacs/do_auth_log.txt -f /usr/local/sbin/tacplus/do_auth.ini
You're not giving it the device address or the address of the user
attempting to auth. Try changing the after authorization line in
tac_plus.conf to:
after authorization "/usr/bin/python /usr/local/sbin/tacplus/do_auth.py -i
$address -u $user -d $name -l /tmp/do_auth.log
-f /usr/local/sbin/tacplus/do_auth.ini"
Note that this will create a do_auth specific log in /tmp/do_auth.log but,
right now - we'll need that for debugging purposes.
Also remember, you'll need to restart tac_plus for this change to take
effect.
Here is an example tac_plus group that I know to work properly with
do_auth.py on CatOS, IOS, IOS-XR, NX-OS, EOS and JUNOS:
group = doauthaccess {
default service = permit
service = exec {
priv-lvl = 1
optional idletime = 30
optional acl = 2
shell:roles="\"network-operator vdc-operator\""
}
service = junos-exec {
bug-fix = "first pair is lost"
local-user-name = "remote"
allow-commands = "(.*exit)|(show cli auth.*)"
deny-commands = ".*"
allow-configuration = ""
deny-configuration = ""
}
after authorization "/usr/bin/python /usr/local/sbin/tacplus/do_auth.py -i
$address -u $user -d $name -l /tmp/do_auth.log
-f /usr/local/sbin/tacplus/do_auth.ini"
}
One more thing... Looking at your do_auth.ini, you seem to have a space
between the commands and ".*" which should not be there.
For example:
exit .*
...should be:
exit.*
I posted a complete working tac_plus.conf and do_auth.ini along with the
AAA config I use on devices the other day. Take a look at that post as
well.
--
John Fraizer
LinkedIn profile: http://www.linkedin.com/in/johnfraizer/
On Fri, Aug 7, 2015 at 5:16 AM, <Kevin.Cruse at instinet.com> wrote:
I will try upgrading to 4.14.5F and see what happens! thanks
wondering if you are familiar with this error in do_auth execution, I am
permitting exit in do_auth.ini. seems to be some issue with do_auth
script:
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=23660848
connect from router1 [172.28.10.124]
Start authorization request
do_author: user='testuser'
user 'testuser' found
authorize_cmd: user=testuser, cmd=exit
cmd exit does not exist, denied by default
After authorization
call: /usr/bin/python /usr/local/sbin/tacplus/do_auth.py -u $user
-l /var/log/tacacs/do_auth_log.txt -f /usr/local/sbin/tacplus/do_auth.ini
substitute: /usr/bin/python /usr/local/sbin/tacplus/do_auth.py -u $user
-l /var/log/tacacs/do_auth_log.txt -f /usr/local/sbin/tacplus/do_auth.ini
Dollar substitution: /usr/bin/python /usr/local/sbin/tacplus/do_auth.py
-u testuser -l /var/log/tacacs/do_auth_log.txt
-f /usr/local/sbin/tacplus/do_auth.ini
pid 24672 child exited status 1
cmd /usr/bin/python /usr/local/sbin/tacplus/do_auth.py -u $user
-l /var/log/tacacs/do_auth_log.txt -f /usr/local/sbin/tacplus/do_auth.ini
returns 1 (unconditional deny)
authorization query for 'testuser' tty130 from router1 rejected
connect from router1 [1.1.1.1]
do_auth.ini:
[users]
testuser =
snm
[snm]
command_deny =
configure .*
show controllers vip .*
command_permit =
show ip .*
show interface .*
clear counters .*
clear qos stat .*
clear mls qos int .*
disable .*
enable .*
end .*
exit .*
logout .*
ping .*
set length .*
show .*
skip-page-display .*
write network .*
write terminal .*
write memory .*
Inactive hide details for John Fraizer ---08/06/2015 06:54:05 PM---I'm
not sure when this command became available in EOS but, John Fraizer
---08/06/2015 06:54:05 PM---I'm not sure when this command became
available in EOS but, at least in 4.14.5F, you will get what y
From: John Fraizer <john at op-sec.us>
To: "Kevin.Cruse at Instinet.com" <Kevin.Cruse at instinet.com>,
Cc: Daniel Schmidt <daniel.schmidt at wyo.gov>, "tac_plus at shrubbery.net" <
tac_plus at shrubbery.net>
Date: 08/06/2015 06:54 PM
Subject: Re: [tac_plus] Cisco Nexus Authorization problem
I'm not sure when this command became available in EOS but, at least in
4.14.5F, you will get what you want with:
aaa authorization commands all default group tacacs+ none
--
John Fraizer
LinkedIn profile: http://www.linkedin.com/in/johnfraizer/
On Thu, Aug 6, 2015 at 1:58 PM, <Kevin.Cruse at instinet.com> wrote:
tried that! arista only takes this command with no arguments:
aaa authorization config-commands
it still didn't work.
fyi - i just tried same config with cisco router and it works
perfectly,
running 4.13.11M of EOS.
From: Daniel Schmidt <daniel.schmidt at wyo.gov>
To: Kevin.Cruse at instinet.com,
Cc: Aaron Wasserott <aaron.wasserott at viawest.com>,
"tac_plus at shrubbery.net" <tac_plus at shrubbery.net>
Date: 08/06/2015 04:09 PM
Subject: Re: [tac_plus] Cisco Nexus Authorization problem
This part of the email looks interesting:
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
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