Also, im not big on posting links, but here is a nice site with Win2003 and RADIUS with IAS.
http://crazyvlan.blogspot.
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Question
Radius Access Challenge Problem on ASA 5505
Hi All,
We have been using the PIX 501 for Remote Access VPN for a while.
For authentication we are using radius.
The radius server provided two factor authentication for us. It used radius challenge-response to achive this.
For example when I attempt to logon I would be prompted for username/password.
After I correctly enter this I then get prompted for my one time password which the radius server would prompt another server to generate and send via voice/sms. The radius server would sent some text back over the challenge response protocol to explain what it is doing. I enter the OTP and get access.
This all worked fine in PIX.
Now I am trying to implement this same thing on ASA.
I seem to be able to validate the Username/Password ok, but when the 1st message is sent back via challenge/response the VPN client terminates with "Reason 413: User authenticaion failed". I know the username/password is ok, and the VPN group password is ok.
I see in the VPN client logs: ""CM/0x63100018 User does not provide any authentication details"
If I try a manual test of the authentication on the ASA using:
test aaa-server authentication RadPxy1812 host 10.10.11.11 username user password Password
I get:
ERROR: Authentication Challenged: No error
Are any of you guys familiar with a similar problem?
My suspicion is around two areas:
1. Challenge Resonse is not supported/enabled on the ASA
2. The ASA somehow validates all challenge-response messages, and seeing as ours are propreitary, the ASA is throwing an error.
Can anybody shed any light?
Many thanks,
Shane
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Answers
Hi Bloodymalth5,
Thanks for the link, very useful.
It is actually a product we develop, it uses a radius proxy to deliver two factor authentication for Cisco VPN.It works fine with PIX but not ASA for some reason.
The logs on the IAS show the the user/password authentication was successful. (1st factor)
The logs on the OTP program show that they send the access-challenge message. (Begin 2nd factor)
The debug info on the ASA show that it received the access challenge.
But for some reason the VPN client gives back a "User not Authenticated" instead of displaying the access challenge message on screen. This PIX displayed the access challenge message no problem.
Do you know if you need to switch on Radius access-challenge on the ASA?
Or have you any other ideas?
Thanks again,
Shane
Hi lrmoore,
Thanks for the information but I really need to get this working for IPSec VPN on the earlier ASA versions also. Your solution could work as an alternative but is not a solution to my problem.
The radius product I use does the 2FA for me and then uses challenge response to generate the OTP for me. I put in some info, the Radius server replies with options etc etc.
I suspect that this is where the problem exists, and would still exist in 8.2.
Regards,
Shane
Hi All,
To follow up I discovered that this problem only exists with Cisco VPN Client Version 5.0.01.0600.
I upgraded to 5.0.05.0290. This resolved the problem.
It turns out the ASA was not the problem but the VPN software was.
It is strange how version 5.0.01.0600 would work with the PIX and not the ASA.
I have now verified that version 5.0.05.0290 works with both PIX and ASA.
Many thanks,
Shane
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by: bloodymalth5Posted on 2009-06-25 at 10:12:44ID: 24713591
Shane,
What type of OTP program are you using? We have clients that use safeword (secure computing) that messes up all of the time. It usually ends up being a problem with either Microsoft IAS, or the Safeword services running on the server. Usually what I see on the ASA side when IAS or Safeword messes up is that running the manual test on the ASA works fine. I have to look at the IAS log or Safeword log to see an error.
Anyway, please let me know what type of OTP software that you are using.
Thanks!