Authen::CAS::Client(3pm)

NAME
Authen::CAS::Client - Provides an easy-to-use interface for authentication using JA-SIG's Central Authentication Service

SYNOPSIS
  use Authen::CAS::Client;

  my $cas = Authen::CAS::Client->new( 'https://example.com/cas' );

  # generate an HTTP redirect to the CAS login URL
  my $r = HTTP::Response->new( 302 );
  $r->header( Location => $cas->login_url );

  # generate an HTTP redirect to the CAS logout URL
  my $r = HTTP::Response->new( 302 );
  $r->header( Location => $cas->logout_url );

  # validate a service ticket (CAS v1.0)
  my $r = $cas->validate( $service, $ticket );
  if( $r->is_success ) {
    print "User authenticated as: ", $r->user, "\n";
  }

  # validate a service ticket (CAS v2.0)
  my $r = $cas->service_validate( $service, $ticket );
  if( $r->is_success ) {
    print "User authenticated as: ", $r->user, "\n";
  }

  # validate a service/proxy ticket (CAS v2.0)
  my $r = $cas->proxy_validate( $service, $ticket );
  if( $r->is_success ) {
    print "User authenticated as: ", $r->user, "\n";
    print "Proxied through:\n";
    print "  $_\n"
      for $r->proxies;
  }

  # validate a service ticket and request a proxy ticket (CAS v2.0)
  my $r = $cas->service_validate( $server, $ticket, pgtUrl => $url );
  if( $r->is_success ) {
    print "User authenticated as: ", $r->user, "\n";

    unless( defined $r->iou ) {
      print "Service validation for proxying failed\n";
    }
    else {
      print "Proxy granting ticket IOU: ", $r->iou, "\n";

      ...
      # map IOU to proxy granting ticket via request to pgtUrl
      ...

      $r = $cas->proxy( $pgt, $target_service );
      if( $r->is_success ) {
        print "Proxy ticket issued: ", $r->proxy_ticket, "\n";
      }
    }
  }

DESCRIPTION
The Authen::CAS::Client module provides a simple interface for authenticating users using JA-SIG's CAS protocol. Both CAS v1.0 and v2.0 are supported.

METHODS

  new $url [, %args]
"new()" creates an instance of an "Authen::CAS::Client" object. $url refers to the CAS server's base URL. %args may contain the following optional parameter:

fatal => $boolean

If this argument is true, the CAS client will "die()" when an error occurs and $@ will contain the error message. Otherwise an "Authen::CAS::Client::Response::Error" object will be returned. See Authen::CAS::Client::Response for more detail on response objects.

  login_url $service [, %args]
"login_url()" returns the CAS server's login URL which can be used to redirect users to start the authentication process. $service is the service identifier that will be used during validation requests. %args may contain the following optional parameters:

renew => $boolean

This causes the CAS server to force a user to re-authenticate even if an SSO session is already present for that user.

gateway => $boolean

This causes the CAS server to only rely on SSO sessions for authentication. If an SSO session is not available for the current user, validation will result in a failure.

  logout_url [%args]
"logout_url()" returns the CAS server's logout URL which can be used to redirect users to end authenticated sessions. %args may contain the following optional parameter:

url => $url

If present, the CAS server will present the user with a link to the given URL once the user has logged out.

  validate $service, $ticket [, %args]
"validate()" attempts to validate a service ticket using the CAS v1.0 protocol. $service is the service identifier that was passed to the CAS server during the login process. $ticket is the service ticket that was received after a successful authentication attempt. Returns an appropriate Authen::CAS::Client::Response object. %args may contain the following optional parameter:

renew => $boolean

This will cause the CAS server to respond with a failure if authentication validation was done via a CAS SSO session.

  service_validate $service, $ticket [, %args]
"service_validate()" attempts to validate a service ticket using the CAS v2.0 protocol. This is similar to "validate()", but allows for greater flexibility when there is a need for proxying authentication to back-end services. The $service and $ticket parameters are the same as above. Returns an appropriate Authen::CAS::Client::Response object. %args may contain the following optional parameters:

renew => $boolean

This will cause the CAS server to respond with a failure if authentication validation was done via a CAS SSO session.

pgtUrl => $url

This tells the CAS server that a proxy ticket needs to be issued for proxying authentication to a back-end service. $url corresponds to a callback URL that the CAS server will use to verify the service's identity. Per the CAS specification, this URL must be HTTPS. If this verification fails, normal validation will occur, but a proxy granting ticket IOU will not be issued.

Also note that this call will block until the CAS server completes its service verification attempt. The returned proxy granting ticket IOU can then be used to retrieve the proxy granting ticket that was passed as a parameter to the given URL.

  proxy_validate $service, $ticket [, %args]
"proxy_validate()" is almost identical in operation to "service_validate()" except that both service tickets and proxy tickets can be used for validation and a list of proxies will be provided if proxied authentication has been used. The $service and $ticket parameters are the same as above. Returns an appropriate Authen::CAS::Client::Response object. %args may contain the following optional parameters:

renew => $boolean

This is the same as described above.

pgtUrl => $url

This is the same as described above.

  proxy $pgt, $target
"proxy()" is used to retrieve a proxy ticket that can be passed to a back-end service for proxied authentication. $pgt is the proxy granting ticket that was passed as a parameter to the "pgtUrl" specified in either "service_validate()" or "proxy_validate()". $target is the service identifier for the back-end system that will be using the returned proxy ticket for validation. Returns an appropriate Authen::CAS::Client::Response object.

BUGS
None are known at this time, but if you find one, please feel free to submit a report to the author.

AUTHOR
jason hord <pravus@cpan.org>

SEE ALSO

Authen::CAS::Client::Response

More information about CAS can be found at JA-SIG's CAS homepage: <http://www.ja-sig.org/products/cas/>

COPYRIGHT
Copyright (c) 2007-2014, jason hord

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.