From 8e8f55458c849c63089fb2847b518940a16e748f Mon Sep 17 00:00:00 2001
From: Jacek Kowalski <jkowalsk@student.agh.edu.pl>
Date: Fri, 04 Sep 2015 23:37:06 +0000
Subject: [PATCH] Allow configuration of CAS response method and CA file location
---
uphpCAS.php | 219 ++++++++++++++++++++++++++++++++++++++++--------------
1 files changed, 160 insertions(+), 59 deletions(-)
diff --git a/uphpCAS.php b/uphpCAS.php
index bce5aab..955d204 100644
--- a/uphpCAS.php
+++ b/uphpCAS.php
@@ -1,7 +1,7 @@
<?php
// Thrown when internal error occurs
class JasigException extends Exception {}
-// Thrown when CAS server return authentication error
+// Thrown when CAS server returns authentication error
class JasigAuthException extends JasigException {}
class JasigUser {
@@ -13,8 +13,11 @@
const VERSION = '1.0';
protected $serverUrl = '';
protected $serviceUrl;
+ protected $sessionName = 'uphpCAS-user';
+ protected $method = 'POST';
+ protected $caFile = NULL;
- function __construct($serverUrl = NULL, $serviceUrl = NULL) {
+ function __construct($serverUrl = NULL, $serviceUrl = NULL, $sessionName = NULL) {
if($serverUrl != NULL) {
$this->serverUrl = rtrim($serverUrl, '/');
}
@@ -22,60 +25,117 @@
if($serviceUrl != NULL) {
$this->serviceUrl = $serviceUrl;
} else {
- $url = 'http://';
- $port = 0;
- if(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
- $url = 'https://';
- if(isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] != '443') {
- $port = $_SERVER['SERVER_PORT'];
- }
- } elseif(isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] != '80') {
- $port = $_SERVER['SERVER_PORT'];
- }
-
- $url .= $_SERVER['SERVER_NAME'];
-
- if($port != 0) {
- $url .= ':'.$port;
- }
- $url .= $_SERVER['REQUEST_URI'];
-
- $this->serviceUrl = $url;
+ $this->serviceUrl = $this->getCurrentUrl();
+ }
+
+ if($sessionName) {
+ $this->sessionName = $sessionName;
+ }
+
+ if(version_compare(PHP_VERSION, '5.6', '<')) {
+ $this->caFile = $this->findCaFile();
}
}
+ public function getCurrentUrl() {
+ $url = 'http://';
+ $port = 0;
+ if(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
+ $url = 'https://';
+ if(isset($_SERVER['SERVER_PORT'])
+ && $_SERVER['SERVER_PORT'] != '443') {
+ $port = $_SERVER['SERVER_PORT'];
+ }
+ } elseif(isset($_SERVER['SERVER_PORT'])
+ && $_SERVER['SERVER_PORT'] != '80') {
+ $port = $_SERVER['SERVER_PORT'];
+ }
+
+ $url .= $_SERVER['SERVER_NAME'];
+
+ if($port != 0) {
+ $url .= ':'.$port;
+ }
+ $url .= $_SERVER['REQUEST_URI'];
+
+ return $url;
+ }
+
+ public function getServerUrl() {
+ return $this->serverUrl;
+ }
public function setServerUrl($serverUrl) {
$this->serverUrl = $serverUrl;
}
+ public function getServiceUrl() {
+ return $this->serviceUrl;
+ }
public function setServiceUrl($serviceUrl) {
$this->serviceUrl = $serviceUrl;
}
- public function loginUrl() {
- return $this->serverUrl.'/login?service='.urlencode($this->serviceUrl);
+ public function getSessionName() {
+ return $this->sessionName;
+ }
+ public function setSessionName($sessionName) {
+ $this->sessionName = $sessionName;
}
- public function logoutUrl() {
- return $this->serverUrl.'/logout';
+ public function getMethod() {
+ return $this->method;
}
-
- public function logout() {
- session_start();
- if(isset($_SESSION['uphpCAS-user'])) {
- unset($_SESSION['uphpCAS-user']);
+ public function setMethod($method) {
+ if($method != 'GET' && $method != 'POST') {
+ throw new DomainException('Unsupported CAS response'
+ .' method: '.$method);
}
- header('Location: '.$this->logoutUrl());
- die();
+ $this->method = $method;
+ }
+
+ public function getCaFile() {
+ return $this->caFile;
+ }
+ public function setCaFile($caFile) {
+ if(!is_file($caFile)) {
+ throw new DomainException('Invalid CA file: '.$caFile);
+ }
+ $this->caFile = $caFile;
+ }
+
+ public function loginUrl() {
+ return $this->serverUrl.'/login?method='.$this->method
+ .'&service='.urlencode($this->serviceUrl);
+ }
+
+ public function logoutUrl($returnUrl = NULL) {
+ return $this->serverUrl.'/logout'
+ .($returnUrl ? '?service='.urlencode($returnUrl) : '');
+ }
+
+ public function logout($returnUrl = NULL) {
+ session_start();
+ if($this->isAuthenticated()) {
+ unset($_SESSION[$this->sessionName]);
+ header('Location: '.$this->logoutUrl($returnUrl));
+ die();
+ } elseif($returnUrl) {
+ header('Location: '.$returnUrl);
+ die();
+ }
+ }
+
+ public function isAuthenticated() {
+ return isset($_SESSION[$this->sessionName]);
}
public function authenticate() {
session_start();
- if(isset($_SESSION['uphpCAS-user'])) {
- return $_SESSION['uphpCAS-user'];
- } elseif(isset($_GET['ticket'])) {
- $user = $this->verifyTicket($_GET['ticket']);
- $_SESSION['uphpCAS-user'] = $user;
+ if($this->isAuthenticated()) {
+ return $_SESSION[$this->sessionName];
+ } elseif(isset($_REQUEST['ticket'])) {
+ $user = $this->verifyTicket($_REQUEST['ticket']);
+ $_SESSION[$this->sessionName] = $user;
return $user;
} else {
header('Location: '.$this->loginUrl());
@@ -83,7 +143,25 @@
}
}
- public function verifyTicket($ticket) {
+ protected function findCaFile() {
+ $cafiles = array(
+ '/etc/ssl/certs/ca-certificates.crt',
+ '/etc/ssl/certs/ca-bundle.crt',
+ '/etc/pki/tls/certs/ca-bundle.crt',
+ );
+
+ $cafile = NULL;
+ foreach($cafiles as $file) {
+ if(is_file($file)) {
+ $cafile = $file;
+ break;
+ }
+ }
+
+ return $cafile;
+ }
+
+ protected function createStreamContext($hostname) {
$context = array(
'http' => array(
'method' => 'GET',
@@ -92,14 +170,33 @@
),
'ssl' => array(
'verify_peer' => TRUE,
- 'allow_self_signed' => FALSE,
+ 'verify_peer_name' => TRUE,
'verify_depth' => 5,
- 'ciphers' => 'HIGH:-MD5:-aNULL:-DES',
+ 'allow_self_signed' => FALSE,
+ 'disable_compression' => TRUE,
),
);
- $data = file_get_contents($this->serverUrl.'/serviceValidate?service='.urlencode($this->serviceUrl).'&ticket='.urlencode($ticket),
- FALSE, stream_context_create($context));
+ if($this->caFile) {
+ $context['ssl']['cafile'] = $this->caFile;
+ }
+
+ if(version_compare(PHP_VERSION, '5.6', '<')) {
+ $context['ssl']['ciphers'] = 'ECDH:DH:AES:CAMELLIA:!SSLv2:!aNULL'
+ .':!eNULL:!EXPORT:!DES:!3DES:!MD5:!RC4:!ADH:!PSK:!SRP';
+ $context['ssl']['CN_match'] = $hostname;
+ }
+
+ return stream_context_create($context);
+ }
+
+ public function verifyTicket($ticket) {
+ $url = parse_url($this->serverUrl);
+ $context = $this->createStreamContext($url['host']);
+
+ $data = file_get_contents($this->serverUrl
+ .'/serviceValidate?service='.urlencode($this->serviceUrl)
+ .'&ticket='.urlencode($ticket), FALSE, $context);
if($data === FALSE) {
throw new JasigException('Authentication error: CAS server is unavailable');
}
@@ -111,19 +208,19 @@
$xml->loadXML($data);
foreach(libxml_get_errors() as $error) {
- $e = new ErrorException($error->message, $error->code, 1, $error->file, $error->line);
+ $e = new ErrorException($error->message, $error->code, 1,
+ $error->file, $error->line);
switch ($error->level) {
case LIBXML_ERR_ERROR:
- throw new Exception('Fatal error during XML parsing', 0, $e);
- break;
case LIBXML_ERR_FATAL:
- throw new Exception('Fatal error during XML parsing', 0, $e);
+ throw new Exception('Fatal error during XML parsing',
+ 0, $e);
break;
}
}
- }
- catch(Exception $e) {
- throw new JasigException('Authentication error: CAS server response invalid - parse error', 0, $e);
+ } catch(Exception $e) {
+ throw new JasigException('Authentication error: CAS server'
+ .' response invalid - parse error', 0, $e);
} finally {
libxml_clear_errors();
libxml_disable_entity_loader($xmlEntityLoader);
@@ -136,23 +233,28 @@
if($failure->length > 0) {
$failure = $failure->item(0);
if(!($failure instanceof DOMElement)) {
- throw new JasigException('Authentication error: CAS server response invalid - authenticationFailure');
+ throw new JasigException('Authentication error: CAS server'
+ .' response invalid - authenticationFailure');
}
- throw new JasigAuthException('Authentication error: '.$failure->textContent);
+ throw new JasigAuthException('Authentication error: '
+ .$failure->textContent);
} elseif($success->length > 0) {
$success = $success->item(0);
if(!($success instanceof DOMElement)) {
- throw new JasigException('Authentication error: CAS server response invalid - authenticationSuccess');
+ throw new JasigException('Authentication error: CAS server'
+ .' response invalid - authenticationSuccess');
}
$user = $success->getElementsByTagName('user');
if($user->length == 0) {
- throw new JasigException('Authentication error: CAS server response invalid - user');
+ throw new JasigException('Authentication error: CAS server'
+ .' response invalid - user');
}
$user = trim($user->item(0)->textContent);
- if(strlen($user)<1) {
- throw new JasigException('Authentication error: CAS server response invalid - user value');
+ if(strlen($user) < 1) {
+ throw new JasigException('Authentication error: CAS server'
+ .' response invalid - user value');
}
$jusr = new JasigUser();
@@ -167,10 +269,9 @@
}
return $jusr;
- }
- else
- {
- throw new JasigException('Authentication error: CAS server response invalid - required tag not found');
+ } else {
+ throw new JasigException('Authentication error: CAS server'
+ .' response invalid - required tag not found');
}
}
}
--
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