AuthCAS - Client library for JA-SIG CAS 2.0 authentication server
AuthCAS aims at providing a Perl API to JA-SIG Central Authentication System (CAS). Only a basic Perl library is provided with CAS whereas AuthCAS is a full object-oriented library.
This script requires IO::Socket::SSL and LWP::UserAgent
A simple example with a direct CAS authentication use AuthCAS; my $cas = new AuthCAS(casUrl => 'https://cas.myserver, CAFile => '/etc/httpd/conf/ssl.crt/ca-bundle.crt', ); my $login_url = $cas->getServerLoginURL('http://myserver/app.cgi'); ## The user should be redirected to the $login_url ## When coming back from the CAS server a ticket is provided in the QUERY_STRING ## $ST should contain the receaved Service Ticket my $user = $cas->validateST('http://myserver/app.cgi', $ST); printf "User authenticated as %s\n", $user; In the following example a proxy is requesting a Proxy Ticket for the target application $cas->proxyMode(pgtFile => '/tmp/pgt.txt', pgtCallbackUrl => 'https://myserver/proxy.cgi?callback=1 ); ## Same as before but the URL is the proxy URL my $login_url = $cas->getServerLoginURL('http://myserver/proxy.cgi'); ## Like in the previous example we should receave a $ST my $user = $cas->validateST('http://myserver/proxy.cgi', $ST); ## Process errors printf STDERR "Error: %s\n", &AuthCAS::get_errors() unless (defined $user); ## Now we request a Proxy Ticket for the target application my $PT = $cas->retrievePT('http://myserver/app.cgi'); ## This piece of code is executed by the target application ## It received a Proxy Ticket from the proxy my ($user, @proxies) = $cas->validatePT('http://myserver/app.cgi', $PT); printf "User authenticated as %s via %s proxies\n", $user, join(',',@proxies);
Jasig CAS is Yale University's web authentication system, heavily inspired by Kerberos. Release 2.0 of CAS provides "proxied credential" feature that allows authentication tickets to be carried by intermediate applications (Portals for instance), they are called proxy.
This AuthCAS Perl module provides required subroutines to validate and retrieve CAS tickets.
my $cas = new AuthCAS( casUrl => 'https://cas.myserver', CAFile => '/etc/httpd/conf/ssl.crt/ca-bundle.crt', );
new constructor lets you create a new AuthCAS object.
Sets the version of the SSL protocol used to transmit data. If the default causes connection issues, setting it to 'SSLv3' may help. see the documentation for "METHODS" in IO::Socket::SSL for more information see http://www.perlmonks.org/?node_id=746493 for more details.
Returns a new AuthCAS or dies on error.
Return module errors
Use the CAS object as a proxy
Returns a URL that you can redirect the browser to, which includes the URL to return to
TODO: it escapes the return URL, but I've noticed some issues with more complicated URL's
Returns non-blocking login URL ie: if user is logged in, return the ticket, otherwise do not prompt for login
Return logout URL After logout user is redirected back to the application
Validate a Service Ticket Also used to get a PGT
Returns the login that created the ticket, if the ticket is valid for that $service URL
returns undef if the ticket is not valid.
Validate a Proxy Ticket
Returns the login that created the ticket, if the ticket is valid for that $service URL, and a list of Proxies used.
user returned == undef if its not a valid ticket
## Access a CAS URL and parses received XML
request a document using https, return status and content
Sven suspects this is intended to be private.
JA-SIG Central Authentication Service http://www.jasig.org/cas
was Yale Central Authentication Service http://www.yale.edu/tp/auth/
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
Olivier Salaun Sven Dowideit