(RADIATOR) SnmpgetProg and DefaultRealms

[Jeremy Hinton]

Hugh,

         I had to postpone work on this for a bit, and am just now getting 
back to it. Maybe i'm missing something, but i don't see how modifying the 
session database would help with this. The session database part is fine, 
its the NAS query that has the issue. From reviewing the perl code, the 
username value sent to the NAS query function is derived from the current 
request, not the active session in the session database. If my terminal 
servers SNMP table shows user 'bob' connected, and i attempt a login as 
'bob at visi.net' (my default realm),  the NAS query will fail when it looks 
for 'bob at visi.net', delete the old session from the session database and 
let me in. I can handle this scenario if i decide to rewrite the username 
and strip the realm out. But then, what about if the terminal server SNMP 
table has a current login as 'bob at visi.net' and i try to log in as just 
'bob'. Stripping the realm wont work in this scenario, i'd need to add the 
realm instead. This only would look to be an issue with the default realm, 
since its the one case where a single entity can log in correctly one of 
two ways (with or without the realm). Your second suggestion of passing the 
rewritten user-name back to the ts in the reply looked promising, that way 
i could force the ts to use %U@%R in its snmp session tables, but it looks 
like my Bay's just ignore any User-Name attributes in the response packet 
:(. The only solution i've found is is to alter the NAS query code to 
equalize both the search for name and the result by adding the default 
realm to both if no realm is specified. I apologize if the above is not 
very clear, it gets my mind in knots sometimes trying to understand it myself.

- jeremy

  04:36 PM 2/27/2003, Hugh Irvine wrote:

>Hello Jeremy -
>
>The way to deal with this situation is to add a column to the session 
>database to contain the rewritten username in addition to the original 
>username. Then you can do your session limit checking on the rewritten 
>username, and the NAS query can continue to use the original username.
>
>BTW - some NAS's will accept the rewritten username in a User-Name 
>attribute in the access accept, or you could also use the Class attribute 
>for the same purpose.
>
>regards
>
>Hugh
>
>
>On Friday, Feb 28, 2003, at 08:23 Australia/Melbourne, Jeremy Hinton wrote:
>
>>Hugh & Mike,
>>
>>         While working on locking down multiple logins recently, i 
>> noticed an interesting situation. I have a default realm of visi.net, so 
>> logging in as bob and bob at visi.net are treated the same. I log into the 
>> server as bob. i then try to log in to the server as bob at visi.net. Now, 
>> i can tailor my SQL lookups to catch this multiple login no problem. 
>> *However*, when the NAS itself gets queried with the SnmpgetProg, it 
>> only checks against what the term server responds with, which may or may 
>> not include the realm. Now, i made a quick hack to the Bay.pm module to 
>> auto add my default realm to both the result and the username if no 
>> realm is specified, but it was a quick and dirty hack hard-coding my 
>> realm.  Maybe i'm missing some way to do this already, but i couldn't 
>> find it. I suppose this would be a feature request then :).  At any 
>> rate, heres my quick patch:
>>
>>bash-2.05# diff -C1 Bay.pm Bay.pm.old
>>*** Bay.pm      Thu Feb 27 16:01:28 2003
>>--- Bay.pm.old      Sun Mar 24 18:10:51 2002
>>***************
>>*** 28,34 ****
>>       {
>>!         my $match = $1;
>>!         $match .= "\@visi.net" unless ($match =~ /\@/);
>>!         $name .= "\@visi.net" unless ($name =~ /\@/);
>>!
>>!         return $match eq $name;
>>       }
>>--- 28,30 ----
>>       {
>>!       return $1 eq $name;
>>       }
>>
>>- jeremy
>>
>>===
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>
>NB: have you included a copy of your configuration file (no secrets),
>together with a trace 4 debug showing what is happening?
>
>--
>Radiator: the most portable, flexible and configurable RADIUS server
>anywhere. Available on *NIX, *BSD, Windows 95/98/2000, NT, MacOS X.
>-
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