Freeradius LDAP weird login issue

[cktan]

Hi Alan,

Previously the freeradius was installed using yum (Centos 4.0) and I'm 
just make a yum search for freeradius and no new update is available. If 
I'm going to get the latest RPM and install manually, will the currently 
configuration is able to work with the latest freeradius? I'm a bit 
worry to upgrade the RPM on the fly as this server currently is on 
production. Looking for your advice in this matter.

Regards

cktan wrote:
> Dear Alan,
>
> The freeradius version is Version 1.0.1. I will try to upgrade to the 
> latest version to see whether it fix. Thank for your suggestion.
>
> Regards
>
> Alan DeKok wrote:
>> cktan wrote:
>>   
>>> Hi all,
>>>
>>> I'm using freeradius+LDAP for the PPPoE dialup access control for a
>>> while. Lately I noticed there is weird issue whereby an user login with
>>> username as "user=5C=5C=5C=5Cuser at domain" and surprisingly freeradius
>>> allow it to login although the actual username should be "user at domain".
>>>     
>>
>>   FreeRADIUS receives the User-Name that the NAS sends it, and ask LDAP
>> if it's OK.
>>
>>   
>>> I've run radius in -X mode and capture the log for your reference as
>>> below. In radiusd -X, we noticed server received Access-Request with
>>> username "user=5C=5C=5C=5Cuser at domain" but when reach to radius_xlat,
>>> the uid will become "user" only and when it query my LDAP the account
>>> for "user" is available and it will accept the access request.
>>>     
>>
>>   The "radius_xlat" doesn't delete '=5C' from the User-Name.
>>
>>   
>>> The question is why "user=5C=5C=5C=5Cuser" = "user"?
>>>     
>>
>>  If the User-Name is that in the Access-Request, it's because that's
>> what the user typed.  The usual reason for the user typing this is
>> because that are trying to cheat you.
>>
>>   
>>> We try the username
>>> with xC (i.e. 1C, 2C, 3C and so on...) and all are able to login because
>>> radius will take as user at domain. 
>>>     
>>
>>    I'm not sure I agree.
>>
>>   
>>> After login, the username in radacct
>>> will become "user=5C=5C=5C=5Cuser at domain" instead of "user at domain". As
>>> the consequence, the smart user may have multiple logins (by using
>>> user=1C/2C/3C....) and the records in radacct is different and therefore
>>> we will out of control for multiple login with single account. Any idea
>>> to fix this?
>>>     
>>
>>   Which version of FreeRADIUS are you running?  I suspect that it's
>> older than 1.1.7, which means it's a bug that was fixed *many* years ago.
>>
>>   Upgrade to 2.1.6, and the problem will go away.
>>
>>   Alan DeKok.
>> -
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>>
>>   
>
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