[tac_plus] Nexus

Daniel Schmidt daniel.schmidt at wyo.gov
Thu May 24 22:44:30 UTC 2012 

As I recall, you ran a separate instance for your nexus.  Use do_auth &
you can use the same instance.  It's python; the code's pretty trivial.  I
look forward to seeing your patches.

-----Original Message-----
From: tac_plus-bounces at shrubbery.net
[mailto:tac_plus-bounces at shrubbery.net] On Behalf Of Alan McKinnon
Sent: Thursday, May 24, 2012 2:43 PM
To: tac_plus at shrubbery.net
Subject: Re: [tac_plus] Nexus

On Thu, 24 May 2012 08:54:12 -0600
Daniel Schmidt <daniel.schmidt at wyo.gov> wrote:

> Yeah... that is a bit of a surprise.  ;-)
>
> If you are worried, strip the long doc string & use do_auth.pyo.
> Should load slightly faster, when I did it, it was 23k before and 7.7k
> after.


Nice tip :-) thanks


> $ python -OO
> Python 2.4.3 (#1, Feb 22 2012, 16:05:45) [GCC 4.1.2 20080704 (Red Hat
> 4.1.2-52)] on linux2 Type "help", "copyright", "credits" or "license"
> for more information.
> >>> import py_compile
> >>> py_compile.compile("do_auth.py")
> >>>
> <hit ctrl-d>
>
> As for Juniper, I had Jathan test it and I believe he said it worked.
> However, there was some Juniper specific stuff I wanted to add.  I'll
> get around to someday soon. Jathan also had some great ideas for
> cleaning up my lazy variable names & logging that I wanted him to add
> if he can get around to it someday. Also, I changed my mind on Nexus
> roles - see tacacs.org for more on roles.

I expect I'll end up doing a fair amount of patching to do-auth (that
being the nature of the work we all do) so I'll be happy to share the
results.

Nexus roles - that's the easy part for me. We use RBAC for that and just
send back the role as an av-pair. The NetOps guys reckon this works best
for how we do our Nexus stuff.

My main driver for testing do_auth is to get the notion of multiple
groups, everything else is bonus.


>
> -----Original Message-----
> From: tac_plus-bounces at shrubbery.net
> [mailto:tac_plus-bounces at shrubbery.net] On Behalf Of Alan McKinnon
> Sent: Wednesday, May 23, 2012 6:01 PM
> To: tac_plus at shrubbery.net
> Subject: Re: [tac_plus] Nexus
>
> On Wed, 16 Nov 2011 10:28:28 -0700
> Daniel Schmidt <daniel.schmidt at wyo.gov> wrote:
>
> > Ok, I got it working, I also have it set so it can find/replace
> > pairs based on groups.  Slight change to do_auth - you DO have to
> > strip the first 2 pairs just like ios, but they are not identical.
> > (cmd* vs cmd=)  Will post that change soon.  This would solve all
> > Alan's problem, if Alan could be convinced to try do_auth.  ;-)
>
> Your wish has been granted and I am convinced to try do_auth.py :-)
>
> It know this one goes back a while but it deserves a reply - my tacacs
> setup has gotten so big, unwieldy and cumbersome that I just can't
> take it any more.
>
> I have the usual mixture so typical of a real-world ISP: at least one
> of everything Cisco have ever made, a bunch of Nexus, couple of XR
> switches, some Juniper and even a few weird firewalls that someone
> once bought because they were cheap. And every skill level amongst
> users from knows nothing to brilliant and it all needs to be
> contained. Sound familiar?
>
> Let's see how it goes. I do have one question though:
>
> Has anyone ever stress tested do_auth.py with lots of requests? On a
> busy day we can achieve 1,000,000 requests (12 a second). tac_plus can
> deal with that without breaking a sweat but I'd like to know if the
> .py script has been tested to that level. Gut feel tells me it should
> be fine.
>
> >
> > The only thing I don't understand is why none of the default roles
> > seem to be restricted.  I could conf t & change an int desc with
> > role-0 and network-operator.  Are all the default roles useless or
> > am I missing something?  The only place I could see a role being
> > "not cumbersome and useless" was if you defined one for a VDC giving
> > a user rights only to a specific VDC.  THAT is the only thing I
> > can't do easier with do_auth and authorization.
> >
> > [root at cwacs ~]# tail -n 11 log2.txt
> > service=shell
> > cmd=
> > shell:roles="network-operator"
> > idletime=3
> > timeout=15
> > Nexus pairs found
> > not len(the_command) > 0
> > Returning:shell:roles="priv-0"
> > Returning:idletime=3
> > Returning:timeout=15
> > 2011-11-16 09:35:31: User 'tester' granted access to <yada yada>
> >
> > 5k# show user- tester
> > user:tester
> >         roles:priv-0
> > account created through REMOTE authentication Credentials such as
> > ssh server key will be cached temporarily only for this user account
> > Local login not possible
> >
> > 5k# show role name priv-0
> >
> > Role: priv-0
> >   Description: This is a system defined privilege role.
> >   vsan policy: permit (default)
> >   Vlan policy: permit (default)
> >   Interface policy: permit (default)
> >   Vrf policy: permit (default)
> >   -------------------------------------------------------------------
> >   Rule    Perm    Type        Scope               Entity
> >   -------------------------------------------------------------------
> >   10      permit  command                         traceroute6 *
> >   9       permit  command                         traceroute *
> >   8       permit  command                         telnet6 *
> >   7       permit  command                         telnet *
> >   6       permit  command                         ping6 *
> >   5       permit  command                         ping *
> >   4       permit  command                         ssh6 *
> >   3       permit  command                         ssh *
> >   2       permit  command                         enable *
> >   1       permit  read
> >
> > -----Original Message-----
> > From: tac_plus-bounces at shrubbery.net
> > [mailto:tac_plus-bounces at shrubbery.net] On Behalf Of Alan McKinnon
> > Sent: Wednesday, November 02, 2011 3:46 PM
> > To: tac_plus at shrubbery.net
> > Subject: Re: [tac_plus] Nexus
> >
> > On Wed, 2 Nov 2011 12:55:21 -0600
> > Daniel Schmidt <daniel.schmidt at wyo.gov> wrote:
> >
> > > I have updated the do_auth.py authentication script to handle
> > > nexus, thus it can provide the same multiple group authentication
> > > it provides on other Cisco devices.   (or at least provide an
> > > example) I have not been able to pass a role tac_pair successfully
> > > - please post if you have any progress with this.
> >
> > tac_plus requires it in this form:
> >
> >                 shell:roles="\"level1\""
> >
> > Yes, you see it right. Two levels of double quotes, inner pair
> > escaped
> >
> > Many brain cells died in agony to discover that one :-)
> >
> > >
> > >
> > >
> > > I had success with the nexus with the following config: (Note that
> > > many of the commands you traditionally look for are available)
> > >
> > >
> > >
> > > !Command: show running-config aaa
> > >
> > > !Time: Wed Oct 26 18:28:46 2011
> > >
> > >
> > >
> > > version 5.0(3)N1(1c)
> > >
> > > aaa authentication login default group private
> > >
> > > aaa authorization config-commands default group private
> > >
> > > aaa authorization commands default group private
> > >
> > > aaa accounting default group private
> > >
> > >
> > >
> > > As was discussed previously, the nexus seems to authenticate pap.
> > > No clue why Cisco did this; putting pap user names in the
> > > tac_plus.conf fixes login issues.   Also, the resulting accounting
> > > file is different so if you have written cgi scripts to parse your
> > > accounting log, be prepared to rewrite them.
> >
> >
> > --
> > Alan McKinnnon
> > alan.mckinnon at gmail.com
> > _______________________________________________
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> > tac_plus at shrubbery.net
> > http://www.shrubbery.net/mailman/listinfo.cgi/tac_plus
> > E-Mail to and from me, in connection with the transaction of public
> > business,is subject to the Wyoming Public Records Act, and may be
> > disclosed to third parties.
> >
> > _______________________________________________
> > tac_plus mailing list
> > tac_plus at shrubbery.net
> > http://www.shrubbery.net/mailman/listinfo.cgi/tac_plus
>
>
>
> --
> Alan McKinnnon
> alan.mckinnon at gmail.com
>
> _______________________________________________
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> business, is subject to the Wyoming Public Records Act and may be
> disclosed to third parties.
>



--
Alan McKinnnon
alan.mckinnon at gmail.com

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