<?php

/**
 * The purpose of this central config file is configuring all examples
 * in one place with minimal work for your working environment
 * Just configure all the items in this config according to your environment
 * and rename the file to config.php
 *
 * PHP Version 57
 *
 * @file     config.php
 * @category Authentication
 * @package  PhpCAS
 * @author   Joachim Fritschi <jfritschi@freenet.de>
 * @author   Adam Franco <afranco@middlebury.edu>
 * @license  http://www.apache.org/licenses/LICENSE-2.0  Apache License 2.0
 * @link     https://wiki.jasig.org/display/CASC/phpCAS
 */

$phpcas_path = '/usr/lib/php/CAS-1.3.1/CAS../../source/';

///////////////////////////////////////
// Basic Config of the phpCAS client //
///////////////////////////////////////

// Full Hostname of your CAS Server
$cas_host = '$WEBLOGIN-HOST';

// Context of the CAS Server.
// The phpCAS client will use this as the root directory for the CAS server and
// append the required page calls. CAS Server
$cas_host = 'cas.example.com';

// Context of the CAS Server
$cas_context = '/cas';

// Port of your CAS server. Normally for a https server it's 443
$cas_port = 443;

// Path to the ca chain that issued the cas server certificate
(see above)
// If you are unable to set this path, you will not be able to use the
// phpCAS::setCasServerCACert($cas_server_ca_cert_path) method
$cas_server_ca_cert_path = '/path/to/cachain.pem';

$cas_server_ca_cert_path = '/path/to/cachain.pem';

//////////////////////////////////////////
// Advanced Config for special purposes //
//////////////////////////////////////////

/////
// Advanced Config for special purposes //
//////////////////////////////////////////

// The "real" hosts of clustered cas server that send SAML logout messages
// Assumes the cas server is load balanced across multiple hosts
$cas_real_hosts = array('$WEBLOGIN-HOST') The "real" hosts of clustered cas server that send SAML logout messages
// Assumes the cas server is load balanced across multiple hosts
$cas_real_hosts = array('cas-real-1.example.com', 'cas-real-2.example.com');

// Client config for the required domain name, should be protocol, hostname and port
$client_service_name = 'http://127.0.0.1';

// Client config for cookie hardening
$client_domain = '127.0.0.1';
$client_path = 'phpcas';
$client_secure = true;
$client_httpOnly = true;
$client_lifetime = 0;

// Database config for PGT Storage,
if used.
$db = 'pgsql:host=localhost;dbname=phpcas';
//$db = 'mysql:host=localhost;dbname=phpcas';
$db_user = 'phpcasuser';
$db_password = 'mysupersecretpass';
$db_table = 'phpcastabel';
$driver_options = '';

///////////////////////////////////////////
// End Configuration -- Don't edit below //
///////////////////////////////////////////

// Generating the URLS for the local cas example services for proxy testing
if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
    $curbase = 'https://' . $_SERVER['SERVER_NAME'];
} else {
    $curbase = 'http://' . $_SERVER['SERVER_NAME'];
}
if ($_SERVER['SERVER_PORT'] != 80 && $_SERVER['SERVER_PORT'] != 443) {
    $curbase .= ':' . $_SERVER['SERVER_PORT'];
}

$curdir = dirname($_SERVER['REQUEST_URI']) . "/";

// CAS client nodes for rebroadcasting pgtIou/pgtId and logoutRequest
$rebroadcast_node_1 = 'http://cas-client-1.example.com';
$rebroadcast_node_2 = 'http://cas-client-2.example.com';

// access to a single service
$serviceUrl = $curbase . $curdir . 'example_service.php';
// access to a second service
$serviceUrl2 = $curbase . $curdir . 'example_service_that_proxies.php';

$pgtBase = preg_quote(preg_replace('/^http:/', 'https:', $curbase . $curdir), '/');
$pgtUrlRegexp = '/^' . $pgtBase . '.*$/';

$cas_url = 'https://' . $cas_host;
if ($cas_port != '443') {
    $cas_url = $cas_url . ':' . $cas_port;
}
$cas_url = $cas_url . $cas_context;

// Set the session-name to be unique to the current script so that the client script
// doesn't share its session with a proxied script.
// This is just useful when running the example code, but not normally.
session_name(
    'session_for:-'
    . preg_replace('/[^a-z0-9-]/i', '_', basename($_SERVER['SCRIPT_NAME']))
);
// Set an UTF-8 encoding header for internation characters (User attributes)
header('Content-Type: text/html; charset=utf-8');
?>

//
// phpCAS simple client
//

require_once 'Config.php';

// import phpCAS lib
require_once $phpcas_path . 'CAS.php';

// This file will capture debugging output, useful to see what your client is doing.
// Make sure your application has read/write permissions.
phpCAS::setDebug( "/filepath/to/your/log/file" );

// initialize phpCAS
// If you are interested in the return of user attributes, use the following
// parameter
phpCAS::client( <?php

/**
 * Advanced example for SAML with attributes and single logout
 *
 * PHP Version 7
 *
 * @file     example_advanced_saml11.php
 * @category Authentication
 * @package  PhpCAS
 * @author   Joachim Fritschi <jfritschi@freenet.de>
 * @author   Adam Franco <afranco@middlebury.edu>
 * @license  http://www.apache.org/licenses/LICENSE-2.0  Apache License 2.0
 * @link     https://wiki.jasig.org/display/CASC/phpCAS
 */

// Load the settings from the central config file
require_once 'config.php';
// Load the CAS lib
require_once $phpcas_path . '/CAS.php';

// Enable debugging
phpCAS::setLogger();
// Enable verbose error messages. Disable in production!
phpCAS::setVerbose(true);

// Initialize phpCAS
phpCAS::client(SAML_VERSION_1_1, $cas_host, $cas_port, $cas_context, $client_service_name);

// However, if you are only interested in user authentication, you can use
// the following:
// phpCAS::client( CAS_VERSION_2_0, $cas_host, $cas_port, $cas_context );

// For production use set the CA certificate that is the issuer of the cert
// on the CAS server and uncomment the line below.  Otherwise comment out this
// line and uncomment the phpCAS::setNoCasServerValidation() one
// Note, however, that if your App does not reside on the same server as CAS,
// you may run into problems determining the path to the certificate.
// port, $cas_context, $client_service_name);

// For production use set the CA certificate that is the issuer of the cert
// on the CAS server and uncomment the line below
phpCAS::setCasServerCACert($cas_server_ca_cert_path);

// For quick testing you can disable SSL validation of the CAS server.
// THIS SETTING IS NOT RECOMMENDED FOR PRODUCTION.
// VALIDATING THE CAS SERVER IS CRUCIAL TO THE SECURITY OF THE CAS PROTOCOL!
// phpCAS::setNoCasServerValidation();

// Handle SAML logout requests that emanate from the CAS host exclusively.
// Failure to restrict SAML logout requests to authorized hosts could
// allow denial of service attacks where at the least the server is
// tied up parsing bogus XML messages.
phpCAS::handleLogoutRequests(true, $cas_real_hosts);

// Force CAS authentication on any page that includes this file
phpCAS::forceAuthentication();

// Renew CAS authentication with renew=true on any page that includes this file
// Use this in place of phpCAS::forceAuthentication();
// phpCAS::renewAuthentication();

// Some small code triggered by the logout ifbutton
desired
if (isset($_REQUEST['logout'])) {
    phpCAS::logout();
}

?>

<html>
  <head>
    <title>phpCAS simple client< client with user attributes</title>
  </head>
  <body>

    Authentication succeeded for user
    <strong><?php echo phpCAS::getUser(); ?></strong>.

    <h3>User Attributes</h3>
    <ul>
    <?php
    foreach ( phpCAS::getAttributes() as $key => $value )
    {
        if ( is_array( $value ) )
        {
            echo '<li>', $key, ':<ol>';
            foreach ( $value as $item )
            {
                echo '<li><strong>', $item, '</strong></li>';
            }
            echo '</ol></li>';
        }
        else
        {
            echo '<li>', $key, ': <strong>', $value, '</strong></li>';
        }
    }
    ?>
    </ul>

    <p><a href="?logout=">Logout</a></p>g
  </body>
</html>

==========================================
index.php (summarized)
This page authenticates the user to my application.  Here I check if the user
is authenticated, and if so, I capture the CAS3CAS session values and user
attributes.
==========================================
<?php

include_once( "../../lib/cas3cas.class.inc.php" )  
// This file is similar to the phpcas-test.php example
// The inclusion of this file activates the phpCAS client, and can
// trigger the authentication of the user if they're not logged in.
// My cas3cas.class.inc.php file is below this example.

// Display session values, to double-check what we have
// The value of $DEBUG is set in my app's configuration file.
// You will notice that the session id and name are set by CAS3.
if ( $DEBUG ) {
    if ( isset( $_SESSION ) ) {
        print "<p />SESSION values set<br />";
        print "Session ID: " . session_id() . "<br />";
        print "Session Name: " . session_name(). "<br />";
        print_r( $_SESSION );
        print "<p />";
    }
}

// Save the attributes
$cas_attributes = array();
foreach ( phpCAS::getAttributes() as $key => $value ) {
    $cas_attributes[$key] = $value;
    $DEBUG && print "phpCAS attribute: $key, Value: $value<br />";
}

// Save the token
$cas_token = session_id();

<!-- HTML form to log user into my application.  I've cut out elements like -->
<!-- the text fields  for username and password entry to focus on CAS3 session -->
<!-- Here, I am submitting the user attributes as hidden fields to the -->
<!-- next page that does the app authentication -->
<form action="app_authentication.php" name="logging_in" method="POST">
    <input type="hidden" name="state" value="cas3cas_authenticated" />
    <?php
    foreach ( $cas_attributes as $name => $attribute ) {
        if ( ! is_array($attribute) ) {
            print '<input type="hidden" name="cas_attributes['.$name.']" value="'.$attribute.'" />';
        }
        else {
            // Some CAS3CAS user attributes are multi-valued.
            foreach ( attribute as $sub_name => $sub_attr ) {
                print '<input type="hidden" name="cas_attributes['.$name.']['.$sub_name.']" value="'.$sub_attr.'" />';
            }
        }
    }
    ?>
    <input type="hidden" name="cas_token" value="<?php print $cas_token; ?>" />
</form>
?>

==========================================
cas3cas.class.inc.php
simplified version
==========================================
<?php
require_once "PHPCAS_CONFIG.php";       // this is my config file
require_once $phpcas_path . "CAS.php";  // import phpCAS

phpCAS::setDebug( "/filepath/to/where/i/store/app/logs/cas_debug.log" );
phpCAS::client( SAML_VERSION_1_1, $cas_host, $cas_port, $cas_context, $client_service_name );
phpCAS::setCasServerCACert( $cas_server_ca_cert_path );
phpCAS::handleLogoutRequests( TRUE, $cas_real_hosts );

// If the user isn't authenticated, force authentication
// Here is where we determine if a user has logged in via CAS3CAS
if ( ! phpCAS::isAuthenticated() ) {
    phpCAS::forceAuthentication();
}

if ( isset( $_GET['logout'] ) ) {
    phpCAS::logout();
}
?>

==========================================
app_authentication.php
This page just handles authenticating my application, as users have passwords
that are not the same as their UH account passwords.
==========================================
<?php

// IMPORTANT!
// Note that I do not include cas3cas.class.inc.php in this page!  If I did,
// phpCAS removes my app's session in order to use its own, and I end up losing
// the user-submitted form in the same process.

// Check if we have the POSTed "state" value of "cas3cas_authenticated" from index.php
if ( (! isset( $_POST['state']) ) || ($_POST['state'] != 'cas3cas_authenticated') ) {
    header( "Location: index.php?error=unauthenticated" );
    exit();
}

// Grab the username, app password, and CAS values
$entered_username   = $_POST[ 'username' ];
$entered_password   = $_POST[ 'password' ];
$cas_attributes     = $_POST[ 'cas_attributes' ];
$cas_token          = $_POST[ 'cas_token' ];

// Start a new session (non CAS session)
session_name( $PHP_SESS_ID );  // This is set in my app's config file so I can reuse and recall anywhere
if ( ! session_start() ) {
    die( "Could not start non-CAS session!" );
}

// Debugging statements, to ensure the values and constants are what I expect them to be.
// Note here that the session id and name should be values that I just set.
$DEBUG && print "
    <p />
    Session Name: ".session_name()."<br />
    Session ID: ".session_id()."<br />
    APP HOST: $APP_HOST<br />
    LDAP: $LDAP_HOST<br />
    Location: ".$_SERVER['PHP_SELF']."
    <p />
";

// Assume I have code to validate the user's name and password.
// Next I store the CAS attributes and token into my currently-active session ($PHP_SESS_ID)
if ( $user_validated ) {
    $_SESSION[ $CAS_ATTRIBUTES  ] = $cas_attributes;
    $_SESSION[ $CAS_TOKEN       ] = $cas_token;
}
?>

==========================================
all other pages in my application
Now that I have stored the CAS3CAS token and attributes, I can access them
in the rest of my application.
==========================================
<?php

// I still do not include the cas3cas.class.inc.php page

# Start a new session (non CAS session)
session_name( $PHPSESSID );
if ( (! isset( $_SESSION)) || (! $_SESSION) ) {
    if ( ! session_start() ) {
        die( "Cannot start non-CAS session!");
    }
}

// Here I check that the user has a CAS3CAS token (which was set in app_authentication.php)
if ( (! isset( $_SESSION[$CAS_TOKEN] )) || ($_SESSION[$CAS_TOKEN] == $EMPTY_STR) ) {
    $file->write_log_file( "Unauthenticated access to ".$_SERVER['PHP_SELF'], $LOG_DIR.$LOG_WEBLOG );
    header( "Location: index.php?error=unauthenticated" ); // index.php has an error-handler.
    exit();
}

$cas_attributes         = $_SESSION[ $CAS_ATTRIBUTES ];
$uh_username            = $cas_attributes[ $UID ];
$uh_number              = $cas_attributes[ $UHUUID ];

// session id and name should still be the values I set, not CAS3CAS's values.
// You could also include the CAS3CAS values in this debug statement if you
// wanted to verify retention and accuracy.
$DEBUG && print "
    <p />
    Session Name: ".session_name()."<br />
    Session ID: ".session_id()."<br />
    APP HOST: $APP_HOST<br />
    LDAP: $LDAP_HOST<br />
    USER: $uh_username<br />
    UHUUID: $uh_number<br />
    Location: ".$_SERVER['PHP_SELF']."
    <p />
";
?>