Strange problem regarding PPTP and FreeRADIUS

[Alan DeKok]

Ali Majdzadeh wrote:
> Hello All
> I have configured PopTop server to work with FreeRADIUS. pptpd is
> configured to use mschap-v2 and mppe-128 and I have enabled the
> corresponding module in FreeRADIUS. When I turn on the debugging mode of
> FreeRADIUS, I get the following:
> 
> rad_recv: Access-Request packet from host 192.168.1.15 port 55483,
> id=227, length=153
>       Service-Type = Framed-User
>       Framed-Protocol = PPP
>       User-Name = "\000ila"

  That's wrong.

>       MS-CHAP-Challenge = 0x78b650db2a6af8bc8bc3435c7a385905
>       MS-CHAP2-Response =
> 0x6e009982bf378318ac706da61a063b70682d0000000000000000e3dbbe517ba9dc7a18dfe5660208bdc1f370b5d7836516f8
>       NAS-IP-Address = 0x0f01a8c0e85adab7e41be2bf081ce2bfb005dab7e41be2bf32

  That's *very* wrong.

> Please note those two highlighted lines, the User-Name is "\000ila"
> while what I have used as the username is "ali". Also, NAS-IP-Address is
> somehow encrypted.
> I searched a lot, but I could not find any similar problem. Any ideas?

  Whoever implemented the RADIUS client did it wrong.  Very, very, wrong.

  Alan DeKok.