Yan,

If I understand correctly, you have deployed App A and App B. You are
not able nor willing to change CAS config on App B because it breaches
PCI compliance.
It seems odd that PCI compliance would allow any user access but not
allow a proxy.
Did you create app A or are both apps from third party vendors?

If app B needs to know the user that is sending the request, then you
will have to use clearpass,
https://apereo.github.io/cas/4.0.x/integration/ClearPass.html.
If app B only needs to have an authenticated user, then perhaps App A
can perform the log in on behalf of all users. The Ajax calls would go
from App A UI to App A service that makes the REST calls.

What do the creators of App B suggest for authentication?

Ray

On 2016-11-02 13:12, Yan Zhou wrote:
> thanks for the feedback.
>
> Unfortunately, we cannot use Proxy Authentication, due to PCI
> implication. A non PCI-compliant App proxy a PCI (credit card)
> service, that would not be allowed by PCI standards.
>
> The reason we run into problem with CAS protected REST services (App
> B, no UI), is that Ajax somehow does not handle redirect (even after I
> enable CORS). Browser does it fine, but fails when Ajax tries to
> access the REST endpoint without an application session in place, thus
> triggers CAS login flow with all the redirect.
>
> I do not see how OAuth solve that problem. Does that requires a Login
> page UI to redirect to and back, would not that run into the same
> problem with Ajax?
>
> Can you elaborate on JSONP? Would app. B now have to know user's
> password?  CAS is nice because the application does not see user's
> password, only CAS server does.
>
> Thx,
> Yan
>
> On Wed, Nov 2, 2016 at 5:41 AM, Pascal Rigaux
> <pascal.rig...@univ-paris1.fr <mailto:pascal.rig...@univ-paris1.fr>>
> wrote:
>
>     Hi,
>
>     Solutions:
>     - proxy CAS: As the proxy ticket can only be validated once, you
>     will need to cache the ticket, or create your own session
>     - JWT: create a JWT and check it on app B.
>     - oauth
>     - JSONP login on app B. We are using this quite a lot. Simple and
>     works great.
>       Commits implementing this on angular-seed :
>     https://github.com/prigaux/angular-seed/commits/master
>     <https://github.com/prigaux/angular-seed/commits/master>
>       and especially the first one:
>     
> https://github.com/prigaux/angular-seed/commit/27eae718ff6fd3206f60926317c7a24ddfd79b68
>     
> <https://github.com/prigaux/angular-seed/commit/27eae718ff6fd3206f60926317c7a24ddfd79b68>
>       I wrote some doc on this, alas in french:
>     http://prigaux.github.io/presentation-web-widgets-cas-jsonp/index.html#/7
>     
> <http://prigaux.github.io/presentation-web-widgets-cas-jsonp/index.html#/7>
>
>     Happy CAS,
>     cu
>
>     On 01/11/2016 20:22, Yan Zhou wrote:
>
>         Hello,
>
>         CAS protocol does not let the apps (CAS client) get TGT
>         ticket. We have a need for that.
>
>         We have two web apps, both are casified in CAS 4.1.X. One web
>         app has AngularJS (Javascript) front end, and, the other
>         webapp is UI-Less, it just offers REST services.
>
>         Javascript code in App A wants to call REST API in App B.  We
>         run into problem with CORS, etc. But, even after CORS are
>         enabled, still run into trouble.
>
>         So, the thought is, if Javascript code can get hold of TGT
>         after user login to the app. A, then, JS code call use CAS
>         REST API to authenticate against the 2nd app (the UI-less REST
>         Services).
>
>         Is that a bad idea, and how is that possible?
>
>         Yan
>
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>     -- 
>     Pascal Rigaux
>
>     Expert en développement et déploiement d'applications
>     DSIUN-SAS (service applications et services numériques)
>     Université Paris 1 Panthéon-Sorbonne  -  Centre Pierre Mendès
>     France (PMF)
>     B 402 - 90, rue de Tolbiac -  75634 PARIS CEDEX 13 - FRANCE
>     Tél : 01 44 07 86 59
>
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-- 
Ray Bon
Programmer Analyst
Development Services, University Systems
2507218831 | CLE C023 | r...@uvic.ca

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