I'm currently making tests with the CAS server 3.5.2 and I'm facing
problems with the logout.
My knowledge in these topics is limited and I don't manage to go further on
that point.
I installed a CAS server and I've got 2 instances of the same java
application that point to that CAS server (appologize if I don't use the
adecuates terms).
So, when I access to the protected resources of my client aplication, I'm
redirected to the CAS login page, I check in my DB if credentials are ok
and then I access the resource. Then, if I access to the same protected
resource from the second instance of the client application I'm not
redirected to login page. That's perfect.
The problem is situated in the logout. To do so, I first execute a
session.invalidate() and access to the CAS logout page. It's ok because,
from the application from which I logged out, I must login again to access
the protected resources. On the other side, the second application remains
connected and I can access the protected resources without login again.
Well, I know that the session.invalidate() is local to the first
application but I thought that CAS server would have "broadcasted" the
desconnexion to the other application but no.
Is there somebody who can give me experience feedback for the single sing
out topic ?
First make sure that SSO is enabled in the CAS properties file, if not make sure the SSO Listener is enabled in the clients.
If they are enabled then my guess would be the issue is in either the LogoutManagerImpl.java or SamlCompliantLogoutMessageCreator.java files.
The SSO in CAS is performed through the back-channel by transmitting a SAML XML message.
I had an issue with the SSO function last year only to find out that the XML message being broadcasted had an error that prevented it from being parsed.
Finally I solved...
In web.xml, the order of filters is important. Filters for Single-sign out must be placed at the begining.
See that section https://wiki.jasig.org/display/CASC/CAS+Client+for+Java+3.1#CASClientforJava3.1-OrderofRequiredFilters
Related
I have configured CAS(v4.0.0) on Apache Tomcat and have multiple clients based on Java, Python and PHP.
What I want to achieve is when I logout from any one application and gets redirected to cas/logout, I want a popup to be opened with all the applications that particular user is logged in with and asks whether you want to log out from every application or not.
I am following the official documentation
http://jasig.github.io/cas/4.2.x/installation/Logout-Single-Signout.html
and found out Single Logout Per Service which allows me to control single logout behavior individually and I can control whether to allow a particular service to use Back Channel or Front Channel or turned off for that application but what I want to achieve is this -
1.Logging out all applications both from CAS and from browser dynamically on button click
2.Logging out a single application from CAS dynamically on button click, with all other applications having their sessions maintained on CAS server and on browser too.
3.Configuration to be changed in PHP and Python clients to handle the logout callback from CAS server.
Any help would be highly appreciated.
Logging out all applications both from CAS and from browser dynamically on button click
invoke /cas/logout. If SLO is turned on, all applications will receive a notification to logout. CAS will logout as well.
Logging out a single application from CAS dynamically on button click, with all other applications having their sessions maintained on CAS server and on browser too.
Well, you go to your application and you log out from the application. Why do you want to involve CAS? CAS is not responsible for maintaining your app and how it works. /app/logout should do the job.
Configuration to be changed in PHP and Python clients to handle the logout callback from CAS server.
You'll need to figure out if your clients support CAS SLO. If they do, they will proceed the SLO notification and kill the app session.
I am beginner in using CAS and i'm using it in one of my project to use its Single Sign On services. Till now i have implemented Single sign on, I have one JAVA client and a PHP Client. But for using Single Sign Out functionality i configured my running CAS according to CAS documentation. I have done all the changes in the deployerConfigContext.xml of my working CAS. My CAS is up running, but on logging out it doesn't show any SAML logout request. I'm using Official PHP Client and Java Client made by me. I think it may be due to these lines which i'm not able to configure it in my Client side.
The way the notification is done (back or front channel) is configured at a service level through the logoutType property. This value is set to LogoutType.BACK_CHANNEL by default.
I'm not able to understand by this line where actually i had to set the Logouttype to BACK_CHANNEL, if its my Client then why is it that it is set to BACK_CHANNEL by default as a Client can be made by anyone.
Any help is highly appreciated.
Thanks in Advance.
Take a look at the jasig documentation: http://jasig.github.io/cas/development/installation/Logout-Single-Signout.html
When a CAS session ends, it notifies each of the services that the SSO
session is no longer valid, and that relying parties need to
invalidate their own session.
This can happen in two ways:
CAS sends an HTTP POST message directly to the service ( back channel communication): this is the traditional way of performing
notification to the service.
CAS redirects (HTTP 302) to the service with a message and a RelayState parameter (front channel communication): This feature is
inspired by SAML SLO, and is needed if the client application is
composed of several servers and use session affinity. The expected
behaviour of the CAS client is to invalidate the application web
session and redirect back to the CAS server with the RelayState
parameter.
And the important part:
Usage Warning!
Front-channel SLO at this point is still experimental.
So your SSO server sends a request to the application directly. The authenticator recognizes that this request is a special one and logouts the referenced user.
Update:
Take a look at the following links:
https://wiki.jasig.org/display/casum/single+sign+out
https://github.com/Jasig/cas/blob/6c3df3a5f42d2d8b771ba773aeda3ba5a4c525e3/cas-server-webapp/src/main/webapp/WEB-INF/spring-configuration/applicationContext.xml
https://github.com/Jasig/cas/blob/6c3df3a5f42d2d8b771ba773aeda3ba5a4c525e3/cas-server-core/src/main/java/org/jasig/cas/logout/LogoutManagerImpl.java
Did you accidantly remove or overwrite your logoutManager declaration in your applicationContext? Is there an logoutManager bean in your running spring context?
I would start by setting break points in the handleLogoutForSloService, performBackChannelLogout and performLogout methods of LogoutManagerImpl.java.
Are they beeing called?
Can you step through them?
Is performBackChannelLogout called?
Is this.httpClient.sendMessageToEndPoint(msg) in performBackChannelLogout successful?
If you are logged on to 2 services, performBackChannelLogout should be called twice with both service urls.
We have ServiceNow among other applications configured in ADFS for SSO, ServiceNow is the only app using SP Initiated signon however.
Sometimes when you log out, it behaves as it should and goes to https://adfs.example.com.au/adfs/ls/?wa=wsignout1.0 and tells you that you are signed out but sometimes instead of going to the signed out page you just get redirected back to ServiceNow, (you can see another SAML request happening and it lets you in) and your session is still logged in. Obviously this represents a security issue! The User logs out then leaves the machine without looking and the session is still open!
Anyone come across this before? It seems SP Initiated Sign On is buggy and I need to fix these log out issues for security reasons.
The wa=wsignout1.0 is intended to use for wsfed applications. servicenow as a SAML2 app should be sending a properly constructed samlp:logoutrequest to the /adfs/ls endpoint to do a signout properly.
I am integrating against a CAS server. User logs into there, gets forwarded to a script which does the CAS validation, gets the User and logs them in. This all works fine.
Part of the spec for the integration is to ensure we ping the CAS server every 60 seconds, to ensure the user does not get logged out at the 'parent' CAS server, as they are still active.
Is there something built into the CAS setup for this purpose? I've been looking through the CAS documentation and the phpCAS client to no avail. There's a renewAuthentication method but it causes the user to have to login again when called. Perhaps this is just a configuraton issue at the server side though?
There is no way for you to ping the CAS server on behalf of the user as your application should not have access to the token identifying the user's session. The default policies automatically extend the user's single sign on session every time the user requests a new service ticket from the CAS server.
However, if you do have the TGT (which you really, really, really should avoid), you can basically request a service ticket for the user, and that would extend the life of the single sign on session (though if you did this, you would not need to do it every 60 seconds, as that's rather extreme).
I have seen a similar post but that was more related to ASP. I will explain my situation below.
I am developing a SP(Relying Party) and integrating with ADFS (IDP). Since I am in the integration phase, I want ADFS to forget that I have previously authenticated so that each time I hit the ADFS endpoint (/adfs/ls) with AuthnRequest, I want it to ask for my credentials.
I believe ADFS by default, remembers clients by their remote IP/host name so clearing cookies on client machine does not help. There was a post that gave a link to logout from IDP (https:///adfs/ls/?wa=wsignout1.0&wreply=https:///adfs/ls/?wa=wsignoutcleanup1.0). The ADFS says I have been logged out but when I hit ADFS endpoint, ADFS redirects back to SP with successful AuthResponse.
Can you please tell me how to force reauthenticate/logout on ADFS or point me to the right articles?
The FederatedPassiveSignInStatus control (which should be part of VS if you've installed all the WIF stuff) will help you. Add it to your app. and clicking it will log you out of everything.
Also AD FS: How to Invoke a WS-Federation Sign-Out
Add wfresh=0 as a URL parameter.
This parameter indicates "freshness requirements".
According to the spec:
If specified, this indicates the desired maximum age of authentication specified in minutes.