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Unverified Commit d0043aff authored by Tim van Dijen's avatar Tim van Dijen Committed by GitHub
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Externalize cas (#1114)

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bin/build-release.sh
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...@@ -53,6 +53,7 @@ php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp- ...@@ -53,6 +53,7 @@ php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp-
php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp-module-authtwitter php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp-module-authtwitter
php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp-module-authx509 php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp-module-authx509
php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp-module-authwindowslive php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp-module-authwindowslive
php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp-module-cas
php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp-module-cdc php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp-module-cdc
php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp-module-consent php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp-module-consent
php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp-module-consentadmin php "$TARGET/composer.phar" require --update-no-dev simplesamlphp/simplesamlphp-module-consentadmin
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modules/cas/default-disable deleted 100644 → 0
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This file indicates that the default state of this module
is disabled. To enable, create a file named enable in the
same directory as this file.
modules/cas/docs/cas.md deleted 100644 → 0
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Using the CAS authentication source with SimpleSAMLphp
==========================================================
This is completely based on the original cas authentication,
the only diffrence is this is authentication module and not a script.
Setting up the CAS authentication module
----------------------------------
The first thing you need to do is to enable the cas module:
touch modules/cas/enable
Adding a authentication source
example authsource.php
----------------------------------
'example-cas' => array(
'cas:CAS',
'cas' => array(
'login' => 'https://cas.example.com/login',
'validate' => 'https://cas.example.com/validate',
'logout' => 'https://cas.example.com/logout'
),
'ldap' => array(
'servers' => 'ldaps://ldaps.example.be:636/',
'enable_tls' => true,
'searchbase' => 'ou=people,dc=org,dc=com',
'searchattributes' => 'uid',
'attributes' => array('uid','cn'),
'priv_user_dn' => 'cn=simplesamlphp,ou=applications,dc=org,dc=com',
'priv_user_pw' => 'password',
),
),
modules/cas/lib/Auth/Source/CAS.php deleted 100644 → 0
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<?php
namespace SimpleSAML\Module\cas\Auth\Source;
/**
* Authenticate using CAS.
*
* Based on www/auth/login-cas.php by Mads Freek, RUC.
*
* @author Danny Bollaert, UGent.
* @package SimpleSAMLphp
*/
class CAS extends \SimpleSAML\Auth\Source
{
/**
* The string used to identify our states.
*/
const STAGE_INIT = '\SimpleSAML\Module\cas\Auth\Source\CAS.state';
/**
* The key of the AuthId field in the state.
*/
const AUTHID = '\SimpleSAML\Module\cas\Auth\Source\CAS.AuthId';
/**
* @var array with ldap configuration
*/
private $ldapConfig;
/**
* @var array cas configuration
*/
private $casConfig;
/**
* @var string cas chosen validation method
*/
private $validationMethod;
/**
* @var string cas login method
*/
private $loginMethod;
/**
* Constructor for this authentication source.
*
* @param array $info Information about this authentication source.
* @param array $config Configuration.
*/
public function __construct($info, $config)
{
assert(is_array($info));
assert(is_array($config));
// Call the parent constructor first, as required by the interface
parent::__construct($info, $config);
if (!array_key_exists('cas', $config)) {
throw new \Exception('cas authentication source is not properly configured: missing [cas]');
}
if (!array_key_exists('ldap', $config)) {
throw new \Exception('ldap authentication source is not properly configured: missing [ldap]');
}
$this->casConfig = $config['cas'];
$this->ldapConfig = $config['ldap'];
if (isset($this->casConfig['serviceValidate'])) {
$this->validationMethod = 'serviceValidate';
} elseif (isset($this->casConfig['validate'])) {
$this->validationMethod = 'validate';
} else {
throw new \Exception("validate or serviceValidate not specified");
}
if (isset($this->casConfig['login'])) {
$this->loginMethod = $this->casConfig['login'];
} else {
throw new \Exception("cas login URL not specified");
}
}
/**
* This the most simple version of validating, this provides only authentication validation
*
* @param string $ticket
* @param string $service
*
* @return array username and attributes
*/
private function casValidate($ticket, $service)
{
$url = \SimpleSAML\Utils\HTTP::addURLParameters($this->casConfig['validate'], [
'ticket' => $ticket,
'service' => $service,
]);
$result = \SimpleSAML\Utils\HTTP::fetch($url);
$res = preg_split("/\r?\n/", $result);
if (strcmp($res[0], "yes") == 0) {
return [$res[1], []];
} else {
throw new \Exception("Failed to validate CAS service ticket: $ticket");
}
}
/**
* Uses the cas service validate, this provides additional attributes
*
* @param string $ticket
* @param string $service
*
* @return array username and attributes
*/
private function casServiceValidate($ticket, $service)
{
$url = \SimpleSAML\Utils\HTTP::addURLParameters(
$this->casConfig['serviceValidate'],
[
'ticket' => $ticket,
'service' => $service,
]
);
$result = \SimpleSAML\Utils\HTTP::fetch($url);
$dom = \SAML2\DOMDocumentFactory::fromString($result);
$xPath = new \DOMXpath($dom);
$xPath->registerNamespace("cas", 'http://www.yale.edu/tp/cas');
$success = $xPath->query("/cas:serviceResponse/cas:authenticationSuccess/cas:user");
if ($success->length == 0) {
$failure = $xPath->evaluate("/cas:serviceResponse/cas:authenticationFailure");
throw new \Exception("Error when validating CAS service ticket: ".$failure->item(0)->textContent);
} else {
$attributes = [];
if ($casattributes = $this->casConfig['attributes']) {
// Some has attributes in the xml - attributes is a list of XPath expressions to get them
foreach ($casattributes as $name => $query) {
$attrs = $xPath->query($query);
foreach ($attrs as $attrvalue) {
$attributes[$name][] = $attrvalue->textContent;
}
}
}
$casusername = $success->item(0)->textContent;
return [$casusername, $attributes];
}
}
/**
* Main validation method, redirects to correct method
* (keeps finalStep clean)
*
* @param string $ticket
* @param string $service
* @return array username and attributes
*/
protected function casValidation($ticket, $service)
{
switch ($this->validationMethod) {
case 'validate':
return $this->casValidate($ticket, $service);
case 'serviceValidate':
return $this->casServiceValidate($ticket, $service);
default:
throw new \Exception("validate or serviceValidate not specified");
}
}
/**
* Called by linkback, to finish validate/ finish logging in.
* @param array $state
* @return void
*/
public function finalStep(&$state)
{
$ticket = $state['cas:ticket'];
$stateID = \SimpleSAML\Auth\State::saveState($state, self::STAGE_INIT);
$service = \SimpleSAML\Module::getModuleURL('cas/linkback.php', ['stateID' => $stateID]);
list($username, $casattributes) = $this->casValidation($ticket, $service);
$ldapattributes = [];
$config = \SimpleSAML\Configuration::loadFromArray(
$this->ldapConfig,
'Authentication source '.var_export($this->authId, true)
);
if ($this->ldapConfig['servers']) {
$ldap = new \SimpleSAML\Auth\LDAP(
$config->getString('servers'),
$config->getBoolean('enable_tls', false),
$config->getBoolean('debug', false),
$config->getInteger('timeout', 0),
$config->getInteger('port', 389),
$config->getBoolean('referrals', true)
);
$ldapattributes = $ldap->validate($this->ldapConfig, $username);
}
$attributes = array_merge_recursive($casattributes, $ldapattributes);
$state['Attributes'] = $attributes;
\SimpleSAML\Auth\Source::completeAuth($state);
}
/**
* Log-in using cas
*
* @param array &$state Information about the current authentication.
* @return void
*/
public function authenticate(&$state)
{
assert(is_array($state));
// We are going to need the authId in order to retrieve this authentication source later
$state[self::AUTHID] = $this->authId;
$stateID = \SimpleSAML\Auth\State::saveState($state, self::STAGE_INIT);
$serviceUrl = \SimpleSAML\Module::getModuleURL('cas/linkback.php', ['stateID' => $stateID]);
\SimpleSAML\Utils\HTTP::redirectTrustedURL($this->loginMethod, ['service' => $serviceUrl]);
}
/**
* Log out from this authentication source.
*
* This function should be overridden if the authentication source requires special
* steps to complete a logout operation.
*
* If the logout process requires a redirect, the state should be saved. Once the
* logout operation is completed, the state should be restored, and completeLogout
* should be called with the state. If this operation can be completed without
* showing the user a page, or redirecting, this function should return.
*
* @param array &$state Information about the current logout operation.
* @return void
*/
public function logout(&$state)
{
assert(is_array($state));
$logoutUrl = $this->casConfig['logout'];
\SimpleSAML\Auth\State::deleteState($state);
// we want cas to log us out
\SimpleSAML\Utils\HTTP::redirectTrustedURL($logoutUrl);
}
}
modules/cas/www/linkback.php deleted 100644 → 0
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<?php
/**
* Handle linkback() response from CAS.
*/
if (!isset($_GET['stateID'])) {
throw new \SimpleSAML\Error\BadRequest('Missing stateID parameter.');
}
$state = \SimpleSAML\Auth\State::loadState($_GET['stateID'], \SimpleSAML\Module\cas\Auth\Source\CAS::STAGE_INIT);
if (!isset($_GET['ticket'])) {
throw new \SimpleSAML\Error\BadRequest('Missing ticket parameter.');
}
$state['cas:ticket'] = (string) $_GET['ticket'];
// Find authentication source
assert(array_key_exists(\SimpleSAML\Module\cas\Auth\Source\CAS::AUTHID, $state));
$sourceId = $state[\SimpleSAML\Module\cas\Auth\Source\CAS::AUTHID];
/** @var \SimpleSAML\Module\cas\Auth\Source\CAS|null $source */
$source = \SimpleSAML\Auth\Source::getById($sourceId);
if ($source === null) {
throw new \Exception('Could not find authentication source with id '.$sourceId);
}
$source->finalStep($state);
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