can CAS handle 3-strike scenario?

Fri Jan 23 17:02:53 EST 2009

Hi, all,

it would make more sense to allow the user to change password (with some kind of rule, such as password Complexity) in CAS. Otherwise, SSO is still not single in some sense. Is it possible this can be implemented in a fast fashion?

The current version definitely will turn off a lots of potential users who has any special requirements (like the locked-out and expired things our system needed).

regards,

Lu

--- On Fri, 1/23/09, Chris Roffler <croffler at earthlink.net> wrote:
From: Chris Roffler <croffler at earthlink.net>
Subject: Re: can CAS handle 3-strike scenario?
To: "Scott Battaglia" <scott.battaglia at gmail.com>, "Yale CAS mailing list" <cas at tp.its.yale.edu>
Date: Friday, January 23, 2009, 3:02 PM

Scott,

This issue has been on the plate for a long time ( perhaps you embmer me harping on this some time back :)

What's it going to take to convince you ? :-)

Chris

----- Original Message ----- 
From: Scott Battaglia 
To: croffler at earthlink.net;Yale CAS mailing list
Sent: 1/23/2009 8:42:29 PM 
Subject: Re: can CAS handle 3-strike scenario?

At the moment all I'm saying is that we'll be supporting relaying messages from backend systems (i.e. your password expired, account locked, etc.).  Integration with other systems to change passwords would be a complimentary but probably separate system.

That's just my 3 second thought on the matter.  I can probably be convinced otherwise :-)

-Scott

-Scott Battaglia
PGP Public Key Id: 0x383733AA
LinkedIn: http://www.linkedin.com/in/scottbattaglia

On Fri, Jan 23, 2009 at 1:07 PM, Chris Roffler <croffler at earthlink.net> wrote:

Sorry to jump in here ....

Scott, are you saying that CAS4 will support back end change of password when back end reports expiration ( like LDAP) ?

Chris

----- Original Message ----- 
From: Scott Battaglia 
To: sirhualu at yahoo.com;Yale CAS mailing list
Sent: 1/23/2009 8:00:03 PM 
Subject: Re: can CAS handle 3-strike scenario?

If I had to guess,I'd have to say closer to 3 months.

Sent from my iPod

On Jan 23, 2009, at 10:23 AM, hua lu <sirhualu at yahoo.com> wrote:

Scott,

thanks for the info.

When do you think that CS4 will be ready? any possibility in the next month or two?

regards,

Lu

--- On Thu, 1/22/09, Scott Battaglia <scott.battaglia at gmail.com> wrote:

From: Scott Battaglia <scott.battaglia at gmail.com>
Subject: Re: can CAS handle 3-strike scenario?
To: "Yale CAS mailing list" <cas at tp.its.yale.edu>
Date: Thursday, January 22, 2009, 5:05 PM

We're looking at that for CAS 4 (in fact, its actually in the CAS4 source code) though CAS4 clearly isn't ready for production :-)

-Scott

-Scott Battaglia
PGP Public Key Id: 0x383733AA
LinkedIn: http://www.linkedin.com/in/scottbattaglia

On Thu, Jan 22, 2009 at 3:15 PM, Dale Ogilvie <Dale.Ogilvie at trimble.co.nz> wrote:

I haven't tried to implement displaying a message from the backend authenticator to the user. Perhaps someone else can suggest something?

I think that password expiry is also a policy that should be handled by your backend identity system. CAS does not manage the users identity today.

From: cas-bounces at tp.its.yale.edu [mailto:cas-bounces at tp.its.yale.edu] On Behalf Of hua lu
Sent: Friday, 23 January 2009 4:01 a.m. 

To: Yale CAS mailing list
Subject: RE: can CAS handle 3-strike scenario?

Dale,

thanks for the helpful answer.

So say if we want to implement the 3 strike rule (the DB side to handle the logic), and to display some specific message (this message is independent from the regular "your password is incorrect" one) when the user login incorrectly for more than three times, is it easy to do in CAS? Have you or somebody have tried to looked at this implementation? which part of the CAS code should I tackle?

Actually we have one more scenario: the password will be expired for every 3 month. Does CAS has any build-in mechanism to handle it? If modification is needed, what necessary steps need to be done? Any example?

regards,

Lu

--- On Wed, 1/21/09, Dale Ogilvie <Dale.Ogilvie at trimble.co.nz> wrote:

From: Dale Ogilvie <Dale.Ogilvie at trimble.co.nz>
Subject: RE: can CAS handle 3-strike scenario?
To: "Yale CAS mailing list" <cas at tp.its.yale.edu>
Date: Wednesday, January 21, 2009, 5:18 PM

Regarding point 2.

I believe CAS does not provide this lockout feature. It must be implemented in the backend authentication system. This makes sense, as any recovery from lockout would best be done at your backend credential store. Any login attempt count and locked out flag should be stored alongside your valid credentials.

Instead of lockout we use an increasing response delay every time a user gets the password wrong. This makes brute force attacks impractical, while still allowing someone who knows the password to get in. This delay is enforced by the backend authenticator, not by CAS.

Dale 

From: cas-bounces at tp.its.yale.edu [mailto:cas-bounces at tp.its.yale.edu] On Behalf Of hua lu
Sent: Thursday, 22 January 2009 10:22 a.m.
To: cas at tp.its.yale.edu
Subject: can CAS handle 3-strike scenario?

Hi, all,

I am new to CAS. Here is my question:
1. We have a customized encoding java class to encode the password (and this encrypted password is stored in database). Is there anybody can provide a concrete example on how to make it happen in configure this encoder?

2. Can CAS handle 3-strike rule? if a user logged in (with good username, but wrong password) unsuccessfully for more than 3 times, the user shall be displayed with a specific message saying that the account is locked out. Is there any generally mechanism already built in CAS to handle this scenario? What kind of code/configuration change is needed? 

Any help on the above topic is greatly appreciated!

LU

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