From 5381e56a3f153414b08f4e42a5cee88c3f6a71ad Mon Sep 17 00:00:00 2001
From: Benjamin Renard <brenard@easter-eggs.com>
Date: Sat, 9 Jul 2022 20:16:15 +0200
Subject: [PATCH] Initial version

---
 .gitignore          |   3 +
 README.md           |  36 ++++
 app.js              | 178 +++++++++++++++++++
 index.php           | 416 ++++++++++++++++++++++++++++++++++++++++++++
 jquery-3.6.0.min.js |   2 +
 logs/.gitignore     |   2 +
 6 files changed, 637 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 README.md
 create mode 100644 app.js
 create mode 100644 index.php
 create mode 100644 jquery-3.6.0.min.js
 create mode 100644 logs/.gitignore

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e3fa8e6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*~
+.*.swp
+*.log
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..438ea1f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,36 @@
+# Single page test CAS Client
+
+This single page application acting as CAS Client.
+
+Features :
+ * Login/Logout on CAS server
+ * Local logout
+ * Show authenticated user's informations (login and attributes)
+ * Show complete debug log of phpCAS library
+
+## Requirements
+
+ * phpCAS library (from php-cas Debian package for instance)
+ * CURL and Dom PHP modules (from php-curl and php-dom Debian packages for instance)
+ * Apache PHP support (using _mod_php_ or _PHP Fpm_, install _libapache2-mod-php_ Debian packages for instance)
+ * One directory writable by Apache user for logging
+
+## Installation
+
+  * Install the application and its requirements
+```
+apt install -y libapache2-mod-php php-cas php-curl php-dom git
+mkdir -p /var/www/connexion/public_html
+git clone https://gogs.zionetrix.net/bn8/test-cas-client-sp.git /var/www/connexion/test-cas-client-sp
+ln -s /var/www/connexion/test-cas-client-sp /var/www/connexion/public_html/test-sp
+chown www-data: /var/www/connexion/test-cas-client-sp/logs
+```
+
+  * Configure access to the application, for instance, in an existing Apache _VirtualHost_ definition by adding something like:
+```
+Alias /test-sp /var/www/connexion/public_html/test-sp
+ProxyPass /test-sp !
+<Directory /var/www/connexion/public_html/test-sp>
+        Require all granted
+</Directory>
+```
diff --git a/app.js b/app.js
new file mode 100644
index 0000000..a19d090
--- /dev/null
+++ b/app.js
@@ -0,0 +1,178 @@
+$(document).ready( function() {
+  // Lookup for UI components
+  var cas_server_selection = $('#cas_server_selection');
+  var select_server = $('#select_server');
+
+  var div_cas_config = $('#cas_config');
+  var ul_cas_config = div_cas_config.find('ul').first();
+
+  var div_user_info = $('#user_info');
+  var div_warnings = $('#warnings');
+
+  var div_cas_logs = $('#cas_logs');
+  var pre_cas_logs = div_cas_logs.find('pre').first();
+
+  var login_btn = $('#login_btn');
+  var caslogout_btn = $('#caslogout_btn');
+  var locallogout_btn = $('#locallogout_btn');
+  var truncatelog_btn = $('#truncatelog_btn');
+
+  // Configure CAS servers selection (from API return)
+  var configure_cas_server_selection = function(cas_servers, selected) {
+    select_server.html('');
+    if (!cas_servers || Object.keys(cas_servers).length <= 1) {
+      cas_server_selection.css('display', 'none');
+      return true;
+    }
+    for (var cas_host in cas_servers) {
+      var option = $('<option value="'+cas_host+'">'+cas_host+'</option>');
+      if (cas_host == selected)
+        option.attr('selected', 'selected');
+      select_server.append(option);
+    }
+    cas_server_selection.css('display', 'block');
+  };
+
+  // Show CAS configuration (from API return)
+  var show_cas_config = function(cas_config) {
+    ul_cas_config.html('');
+    if (!cas_config) {
+      div_cas_config.css('display', 'none');
+      return true;
+    }
+    for (var key in cas_config) {
+      var li = $('<li><strong>'+key+':</strong> <em>'+cas_config[key]+'</em></li>');
+      ul_cas_config.append(li);
+    }
+    div_cas_config.css('display', 'block');
+  };
+
+  // Show warning messages (from API return)
+  var show_warnings = function(warnings) {
+    div_warnings.html('<h2>Warning messages</h2>');
+    if (!warnings.length) {
+      div_warnings.css('display', 'none');
+      return true;
+    }
+    var ul = $('<ul>');
+    $(warnings).each(function(idx, warning) {
+      var li = $('<li>'+warning+'</li>');
+      ul.append(li);
+    });
+    div_warnings.append(ul);
+    div_warnings.css('display', 'block');
+  };
+
+  // Show phpCAS logs
+  var show_cas_logs = function(logs) {
+    pre_cas_logs.html('');
+    if (!logs) {
+      div_cas_logs.css('display', 'none');
+      return true;
+    }
+    pre_cas_logs.html(logs);
+    div_cas_logs.css('display', 'block');
+  };
+
+  // Show user information
+  var show_user_info = function(username, attributes) {
+    div_user_info.html('<h2>Connected user information</h2>');
+    div_user_info.css('display', 'block');
+    if (!username) {
+      div_user_info.append('<p>Not connected</p>');
+      return true;
+    }
+    var p_username = $('<p><strong>Username:</strong> <em>'+username+'</em></p>');
+    div_user_info.append(p_username);
+
+    div_user_info.append('<h3>Attributes</h3>');
+    var ul = $('<ul>');
+    if (attributes) {
+      for (var attr in attributes) {
+        var li = $('<li><strong>'+attr+':</strong> <em>'+attributes[attr]+':</em></li>');
+        ul.append(li);
+      }
+    }
+    else {
+      ul.append($('<li>No attribute.</li>'));
+    }
+    div_user_info.append(ul);
+
+  };
+
+  // Handle API AJAX call return
+  var handle_ajax_return = function(data) {
+    configure_cas_server_selection(data.cas_servers, data.cas_server);
+    show_warnings(data.warnings);
+    show_cas_logs(data.logs);
+    show_cas_config(data.config);
+    show_user_info(data.user, data.attributes);
+  };
+
+  // Handle API AJAX call fail
+  var handle_ajax_fail = function(jqXHR, textStatus, errorThrown) {
+    alert('An error occurred during AJAX request: '+textStatus);
+  };
+
+  // Make an API AJAX call
+  var make_ajax_call = function(action, data, callback) {
+    if (!data) data = {};
+    data['do'] = action;
+    $.ajax(
+      {type: "GET", url: 'index.php', data: data}
+    ).done(function(data) {
+      handle_ajax_return(data);
+      if (callback) callback(data);
+    }).fail(handle_ajax_fail);
+  };
+
+  // On select server change, make API call to change current server
+  select_server.on('change', function(event) {
+    make_ajax_call('change_server', {'server': select_server.val()});
+  });
+
+  // On local logout button click, make API call to trigger it
+  locallogout_btn.on('click', function(event) {
+    make_ajax_call('locallogout');
+  });
+
+  // On CAS logout button click, make API call to trigger it
+  caslogout_btn.on('click', function(event) {
+    make_ajax_call('logout', {}, function(data) {
+      if (data.data && data.data.logout_url)
+        window.location = data.data.logout_url;
+    });
+  });
+
+  // On login button click, make API call to trigger it
+  login_btn.on('click', function(event) {
+    make_ajax_call('login', {}, function(data) {
+      if (data.data && data.data.login_url)
+        window.location = data.data.login_url;
+    });
+  });
+
+  // On truncate log button click, make API call to trigger it
+  if (truncatelog_btn) {
+    truncatelog_btn.on('click', function(event) {
+      make_ajax_call('truncatelog');
+    });
+  }
+
+  // Check if CAS ticket is present in current URL
+  var check_ticket_is_present = new RegExp('[\?&]ticket=([^&]+)');
+  var ticket_data = check_ticket_is_present.exec(window.location);
+
+  // If CAS ticket present, make API call to validate it
+  if (ticket_data) {
+    make_ajax_call('validate_ticket', {'ticket': ticket_data[1]}, function(data) {
+      // If ticket is valid, clean current URI
+      if (data.success)
+        window.location = 'index.php';
+    });
+  }
+  else {
+    // if not CAS ticket present, make API call to get current status
+    make_ajax_call('status');
+  }
+});
diff --git a/index.php b/index.php
new file mode 100644
index 0000000..ca6fc5d
--- /dev/null
+++ b/index.php
@@ -0,0 +1,416 @@
+<?php
+
+/*
+
+ ************************************
+ *          Configuration           *
+ ************************************
+
+*/
+
+// PhpCAS library path
+$phpCAS_path = "CAS.php";
+
+// All valid CAS servers
+$cas_servers = array(
+	// CAS server hostname
+	$_SERVER['SERVER_NAME'] => array(
+		// Context of the CAS Server
+		'context' => '/idp/cas',
+		// CAS server port
+		'port' => 8443,
+		// If you running this application in HTTP only, uncomment following parameter
+		//'insecure' => true,
+		// Disable CAS server Validation
+		'ssl_validation' => false,
+		// If ssl_validation is enable you must define
+		'ssl_cacert_path' => '/etc/ssl/certs/ca-certificates.crt',
+		'ssl_cn_validation' => true,
+		// Extra CURL options (for phpCAS client)
+		'extra_curl_options' => array(
+			// Uncomment it in case of 'dh key too small' error
+			// 'CURLOPT_SSL_CIPHER_LIST' => 'DEFAULT@SECLEVEL=1',
+		),
+	),
+	$_SERVER['SERVER_NAME'].'2' => array(
+		// Context of the CAS Server
+		'context' => '/idp/cas',
+		// CAS server port
+		'port' => 8443,
+		// If you running this application in HTTP only, uncomment following parameter
+		//'insecure' => true,
+		// Disable CAS server Validation
+		'ssl_validation' => false,
+		// If ssl_validation is enable you must define
+		'ssl_cacert_path' => '/etc/ssl/certs/ca-certificates.crt',
+		'ssl_cn_validation' => true,
+		// Extra CURL options (for phpCAS client)
+		'extra_curl_options' => array(
+			// Uncomment it in case of 'dh key too small' error
+			// 'CURLOPT_SSL_CIPHER_LIST' => 'DEFAULT@SECLEVEL=1',
+		),
+	),
+);
+
+// FQDN of CAS server
+$default_cas_server = key($cas_servers);
+
+// PhpCAS debug logs
+
+// Log directory path
+$phpCAS_logdir = 'logs';
+
+// Log filename format
+// Compose with :
+//  - {cas_server} : the CAS server
+//  - {remote_addr} : connected user remote IP address
+//  - {session_id} : connected user session_id
+$phpCAS_logfile_format = '{session_id}-{cas_server}.log';
+
+// Local app URL (auto-detect on first acces if null)
+$service_url = null;
+
+/*
+
+ ************************************
+ *               Main               *
+ ************************************
+
+*/
+
+$warnings = array();
+
+session_start();
+require $phpCAS_path;
+CAS_GracefullTerminationException::throwInsteadOfExiting();
+
+// Initialize session variables
+if (isset($_SESSION['cas_server']) && array_key_exists($_SESSION['cas_server'], $cas_servers)) {
+	$cas_host = $_SESSION['cas_server'];
+}
+else {
+	$_SESSION['cas_server'] = $cas_host = $default_cas_server;
+}
+if (!isset($_SESSION['user'])) $_SESSION['user'] = null;
+if (!isset($_SESSION['attributes'])) $_SESSION['attributes'] = null;
+
+// Generate phpCAS debug log file path
+$phpCAS_logfile = "$phpCAS_logdir/$phpCAS_logfile_format";
+$phpCAS_logfile = str_replace('{cas_server}', $cas_host, $phpCAS_logfile);
+$phpCAS_logfile = str_replace('{remote_addr}', $_SERVER['REMOTE_ADDR'], $phpCAS_logfile);
+$phpCAS_logfile = str_replace('{session_id}', session_id(), $phpCAS_logfile);
+
+$phpCAS_config = array();
+
+function init_phpCAS() {
+	global $phpCAS_logfile, $phpCAS_config, $warnings, $cas_host, $cas_servers, $service_url;
+
+	// Make sure service URL is defined (otherwise, load it from session or auto-detect)
+	if (is_null($service_url)) {
+		if (isset($_SESSION['service_url'])) {
+			$service_url = $_SESSION['service_url'];
+		}
+		else {
+			$https = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off');
+			$request_uri = $_SERVER['REQUEST_URI'];
+			$request_uri = preg_replace('/\?.*$/', '', $request_uri);
+			$service_url = "http".($https?"s":"")."://".$_SERVER['SERVER_NAME'];
+			if (($_SERVER['SERVER_PORT'] != 443 && $https) || ($_SERVER['SERVER_PORT'] != 80 && !$https))
+				$service_url .= ":".$_SERVER['SERVER_PORT'];
+			$service_url .= $request_uri;
+			$_SESSION['service_url'] = $service_url;
+		}
+	}
+	// Compute phpCAS configuration
+	$phpCAS_config = array(
+		'CAS Hostname' => $cas_host,
+		'CAS server port' => $cas_servers[$cas_host]['port'],
+		'CAS server context' => $cas_servers[$cas_host]['context'],
+		'Service URL' => $service_url,
+	);
+
+	// Set phpCAS log file
+	if (is_writable($phpCAS_logfile) || (!is_file($phpCAS_logfile) && is_writable(dirname($phpCAS_logfile)))) {
+		$phpCAS_config['Debug file'] = $phpCAS_logfile;
+		phpCAS::setDebug($phpCAS_logfile);
+	}
+
+	try {
+		phpCAS::client(
+			CAS_VERSION_2_0,
+			$cas_host,
+			$cas_servers[$cas_host]['port'],
+			$cas_servers[$cas_host]['context']
+		);
+		phpCAS::setNoClearTicketsFromUrl();
+		phpCAS::setFixedServiceURL($service_url);
+
+		// Set extra CURL options
+		if (isset($cas_servers[$cas_host]['extra_curl_options']) && is_array($cas_servers[$cas_host]['extra_curl_options'])) {
+			foreach($cas_servers[$cas_host]['extra_curl_options'] as $opt => $value) {
+				if (is_string($opt) && substr($opt, 0, 7) == 'CURLOPT' && defined($opt))
+					$opt = constant($opt);
+				phpCAS::setExtraCurlOption($opt, $value);
+			}
+		}
+
+		if ($cas_servers[$cas_host]['insecure']) {
+			$phpCAS_config['Insecure'] = 'Yes';
+			$phpCAS_config['Base URL'] = 'http://'.$cas_host.($cas_servers[$cas_host]['port']?':'.$cas_servers[$cas_host]['port']:'').$cas_servers[$cas_host]['context'];
+			// Remove trailing slash if present
+			if (substr($phpCAS_config['Base URL'], -1)=='/')
+				$phpCAS_config['Base URL'] = substr($phpCAS_config['Base URL'], 0, -1);
+			$phpCAS_config['Login URL'] = $phpCAS_config['Base URL']."/login?service=".urlencode($service_url);
+			$phpCAS_config['Logout URL'] = $phpCAS_config['Base URL']."/logout";
+			$phpCAS_config['Service validate URL'] = $phpCAS_config['Base URL']."/serviceValidate";
+			phpCAS::setServerLoginURL($phpCAS_config['Login URL']);
+			phpCAS::setServerLogoutURL($phpCAS_config['Logout URL']);
+			phpCAS::setServerServiceValidateURL($phpCAS_config['Service validate URL']);
+			// Be sure SSL validation is disabled
+			$cas_servers[$cas_host]['ssl_validation'] = false;
+		}
+		else
+			$phpCAS_config['Insecure'] = 'No';
+
+		if ($cas_servers[$cas_host]['ssl_validation'] === true) {
+			if (is_readable($cas_servers[$cas_host]['ssl_cacert_path'])) {
+				$phpCAS_config['SSL Validation'] = 'Enabled';
+				$phpCAS_config['SSL CA Cert Validation File'] = $cas_servers[$cas_host]['ssl_cacert_path'];
+				$phpCAS_config['SSL CN Validation'] = (
+					$cas_servers[$cas_host]['ssl_cn_validation']?
+					'Enabled':'Disabled'
+				);
+				phpCAS::setCasServerCACert(
+					$cas_servers[$cas_host]['ssl_cacert_path'],
+					$cas_servers[$cas_host]['ssl_cn_validation']
+				);
+			}
+			else {
+				$warnings[] = 'SSL validation enable for this server but CA Cert file configured does not exists or is not readable';
+				$phpCAS_config['SSL Validation'] = 'Disabled';
+				phpCAS::setNoCasServerValidation();
+			}
+		}
+		else {
+			$phpCAS_config['SSL Validation'] = 'Disabled';
+			phpCAS::setNoCasServerValidation();
+		}
+
+		phpCAS::setCacheTimesForAuthRecheck(0);
+	}
+	catch (CAS_GracefullTerminationException $e) {
+		$warnings[] = 'PhpCAS return exception';
+		return false;
+	}
+	return true;
+}
+
+function local_logout() {
+	unset($_SESSION['session_url']);
+	unset($_SESSION['phpCAS']);
+	unset($_SESSION['user']);
+	unset($_SESSION['attributes']);
+	return !isset($_SESSION['phpCAS']);
+}
+
+function json_output($success=true, $data=null, $return_code=200, $exit=true) {
+	global $warnings, $phpCAS_config, $phpCAS_logfile, $cas_servers;
+
+	// Retreive phpCAS logs
+	$logs = false;
+	if (is_writable($phpCAS_logfile)) {
+		$lines = file($phpCAS_logfile);
+		if (is_array($lines)) {
+			$logs = implode('',$lines);
+		}
+		else {
+			$warnings[] = "Error reading PhpCAS debug log file ($phpCAS_logfile).";
+		}
+	}
+	else {
+		$warnings[] = "PhpCAS debug log file does not exists or is not writable ($phpCAS_logfile).";
+	}
+
+	// Compute return data
+	$return = array(
+		'success' => $success,
+		'data' => $data,
+		'logs' => $logs,
+		'warnings' => $warnings,
+		'config' => $phpCAS_config,
+		'cas_servers' => $cas_servers,
+		'cas_server' => $_SESSION['cas_server'],
+		'user' => $_SESSION['user'],
+		'attributes' => $_SESSION['attributes'],
+	);
+
+	// Handle JSON output
+  http_response_code($return_code);
+  header('Content-Type: application/json; charset=utf-8');
+  echo json_encode($return);
+  if ($exit) exit();
+}
+
+// Handle API call
+if (isset($_REQUEST['do'])) {
+	switch($_REQUEST['do']) {
+		case 'status':
+			json_output(init_phpCAS());
+			break;
+
+		case 'change_server':
+			if (!isset($_REQUEST['server'])) {
+				$warnings[] = "Invalid parameters: selected CAS server is missing.";
+				json_output(false);
+			}
+
+		  if (!isset($cas_servers[$_REQUEST['server']])) {
+				$warnings[] = "Invalid CAS server choiced";
+				json_output(false);
+			}
+			if ($_SESSION['cas_server'] != $_REQUEST['server']) {
+				local_logout();
+			}
+			$cas_host = $_SESSION['cas_server'] = $_REQUEST['server'];
+			json_output(init_phpCAS());
+			break;
+
+		case 'login':
+			if (!init_phpCAS()) json_output(false);
+			if (phpCAS::isAuthenticated()) {
+				$warnings[] = 'Already authenticated. Please logout (at least local logout) before.';
+				json_output(false);
+			}
+
+			json_output(true, array('login_url' => phpCAS::getServerLoginURL()));
+			break;
+
+		case 'validate_ticket':
+			if (!init_phpCAS()) json_output(false);
+
+			if (phpCAS::isAuthenticated()) {
+				$_SESSION['user'] = phpCAS::getUser();
+				$_SESSION['attributes'] = phpCAS::getAttributes();
+				json_output(true);
+			}
+			else {
+				$warnings[] = 'Fail to validate ticket, please check logs.';
+				json_output(false);
+			}
+			break;
+
+		case 'logout':
+			if (!init_phpCAS()) json_output(false);
+			if (!phpCAS::isAuthenticated()) {
+				$warnings[] = 'Not currently authenticated.';
+				json_output(false);
+			}
+			if (!local_logout()) {
+				$warnings[] = 'Fail to purge local session.';
+				json_output(false);
+			}
+			$logout_url = phpCAS::getServerLogoutURL().'?<se></se>rvice='.$service_url;
+			json_output(true, array('logout_url' => $logout_url));
+			break;
+
+		case 'locallogout':
+			unset($_SESSION['session_url']);
+			unset($_SESSION['phpCAS']);
+			unset($_SESSION['user']);
+			unset($_SESSION['attributes']);
+			json_output();
+			break;
+
+		case 'truncatelog':
+			$success = false;
+			if (is_file($phpCAS_logfile)) {
+				if (!is_writable(dirname($phpCAS_logfile))) {
+					$warnings[] = 'Logs directory is not writable ('.dirname($phpCAS_logfile).').';
+					json_output(false);
+				}
+				$fh = fopen($phpCAS_logfile, 'w');
+				fclose($fh);
+			}
+			json_output(true);
+			break;
+
+		default:
+			$warnings[] = 'Invalid request';
+			json_output(false);
+	}
+}
+
+?>
+<html>
+<head>
+	<title>Test CAS</title>
+	<script src="jquery-3.6.0.min.js"></script>
+	<script src="app.js"></script>
+	<style>
+	h2 {
+		border-bottom: 1px solid;
+	}
+
+	strong {
+		font-size: 0.9em;
+	}
+
+	em {
+		font-size: 0.8em;
+	}
+
+	#warnings {
+		color: #fff;
+		background-color: #C56E6E;
+	}
+
+	pre {
+		margin-left: 1em;
+		padding: 1em;
+		border-left: 1px solid;
+		background-color: #eee;
+		font-size: 0.9em;
+	}
+
+	/* Defaulty hide UI components (expect menu) */
+	#cas_server_selection, #cas_config, #user_info, #warnings, #cas_logs {
+		display: none;
+	}
+	</style>
+
+</style>
+<body>
+<h1>Test CAS Application</h1>
+
+<div id='cas_server_selection'>
+	<h2>CAS server selection</h2>
+	<form action='index.php' method='POST'>
+		<label for='server'>CAS server</label> :
+		<select name='server' id='select_server'></select>
+	</form>
+</div>
+
+<div id='cas_config'>
+	<h2>PhpCAS configuration</h2>
+	<ul></ul>
+</div>
+
+<h2>Menu</h2>
+<ul>
+ <li><button id='login_btn'>Login</button></li>
+ <li><button id='caslogout_btn'>Logout on CAS server</button></li>
+ <li><button id='locallogout_btn'>Logout on local application</button></li>
+ <li><button id='truncatelog_btn'>Truncate Debug log file content</button></li>
+</ul>
+
+<div id='user_info'></div>
+
+<div id='warnings'></div>
+
+<div id='cas_logs'>
+	<h2>PhpCAS Debug logs</h2>
+	<pre></pre>
+</div
+
+</body>
+</html>
diff --git a/jquery-3.6.0.min.js b/jquery-3.6.0.min.js
new file mode 100644
index 0000000..c4c6022
--- /dev/null
+++ b/jquery-3.6.0.min.js
@@ -0,0 +1,2 @@
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diff --git a/logs/.gitignore b/logs/.gitignore
new file mode 100644
index 0000000..87b94e4
--- /dev/null
+++ b/logs/.gitignore
@@ -0,0 +1,2 @@
+*.log
+*.log.*