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Aleksander Machniak 2018-11-19 13:28:23 +01:00
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GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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Single Sign On Authentication for Kolab
---------------------------------------
This plugin adds possibility to authenticate users via external authentication
services. Currently the only supported method of authentication is OpenID Connect.
Because Kolab backends do not support token authentication it is required
to use master user (sasl proxy) authentication, i.e. you have to put
master user credentials in plugin's config.
Plugin requires libkolab plugin and HTTP/Request2 library.
Plugin contains BSD-licensed https://github.com/firebase/php-jwt (v5.0.0) library.
Supported algorithms:
- HS256, HS385, HS512 (PHP hash extension required)
- RS256, RS384, RS512 (PHP openssl extension required).
INSTALLATION
------------
Enable plugin in Roundcube's main configuration file. Make sure it is first
on the list of plugins, especially before any authentication plugin, e.g. kolab_auth.
Default return URL for Auth Provider is https://host.roundcube?_task=login&_action=sso,
but not all providers support query params. To workaround this limitation you have to
define an alias URI or redirect. For example:
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/roundcubemail
RewriteRule "^sso" "/roundcubemail/?_task=login&_action=sso" [L,QSA]
For the above "alias" plugin configuration should include 'response_uri' = '/sso'
and on the provider side configured URI will be https://host/roundcubemail/sso.
TODO
----
- SMTP auth
- LDAP addressbook
- kolab_delegation (LDAP auth)
- Chwala auth (+Seafile, +WebDAV)
- Freebusy auth
- Mattermost auth
- Improved token validation

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plugins/kolab_sso/composer.json Normal file
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{
"name": "kolab/kolab_sso",
"type": "roundcube-plugin",
"description": "Single Sign On for Kolab",
"homepage": "https://git.kolab.org/diffusion/RPK/",
"license": "AGPLv3",
"version": "3.4.0",
"authors": [
{
"name": "Aleksander Machniak",
"email": "machniak@kolabsys.com",
"role": "Lead"
}
],
"repositories": [
{
"type": "composer",
"url": "http://plugins.roundcube.net"
}
],
"require": {
"php": ">=5.3.0",
"roundcube/plugin-installer": ">=0.1.3",
"kolab/libkolab": ">=3.4.0",
"pear/http_request2": "~2.3.0"
}
}

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plugins/kolab_sso/config.inc.php.dist Normal file
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<?php
// Enable debugging
$config['kolab_sso_debug'] = true;
// Proxy user
$config['kolab_sso_username'] = 'cyrus-admin';
// Proxy user password
$config['kolab_sso_password'] = 'password';
// Require SSO logon by removing possibility to logon with user/password
$config['kolab_sso_disable_login'] = false;
// SSO providers/configuration
$config['kolab_sso_options'] = array();
/* Example:
$config['kolab_sso_options'] = array(
'keycloak' => array(
// User-friendly name (will be displayed in the button label)
'name' => 'OpenIDC Test',
// Driver name
'driver' => 'openidc',
// Provider API URI
'uri' => 'https://kolab.eu.auth0.com',
// Client ID/Secret for the API
'client_id' => '20w6DXX69isNBaufCwyK24wkBHqPT2ht',
'client_secret' => 'd78McGW4UWfFyZprGd8BCKooll',
// Token URI, if different than <uri>/token
'token_uri' => 'https://kolab.eu.auth0.com/oauth/token',
// Authorize URI, if different than <uri>/authorize
'authorize_uri' => 'https://kolab.eu.auth0.com/authorize',
// Response URI, by default we use https://domain.tld/path?_task=login&_action=sso
// Define it if the Provider does not allow above
// to use https://domain.tld/path/<response_uri> instead
'response_uri' => '/sso',
// Public key for token validation when using RS256/RS385/RS512 method
'pubkey' => '-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
',
),
);
*/

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<?php
/**
* kolab_sso driver implementing OpenIDC Authorization Code Flow
* https://openid.net/specs/openid-connect-core-1_0.html#CodeFlowSteps
*
* TODO: Discovery: https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderConfigurationRequest
*
* @author Aleksander Machniak <machniak@kolabsys.com>
*
* Copyright (C) 2018, Kolab Systems AG <contact@kolabsys.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
class kolab_sso_openidc
{
protected $id = 'openidc';
protected $config = array();
protected $plugin;
public function __construct($plugin, $config)
{
$this->plugin = $plugin;
$this->config = $config;
$this->plugin->require_plugin('libkolab');
}
/**
* Authentication request (redirect to SSO service)
*/
public function authorize()
{
$params = array(
'response_type' => 'code',
'scope' => 'openid email offline_access',
'client_id' => $this->config['client_id'],
'state' => $this->plugin->rc->get_request_token(),
'redirect_uri' => $this->redirect_uri(),
);
// TODO: Other params by config: display, prompt, max_age,
$url = $this->config['authorize_uri'] ?: (unslashify($this->config['uri']) . '/authorize');
$url .= '?' . http_build_query($params);
$this->plugin->debug("[{$this->id}][authorize] Redirecting to $url");
header("Location: $url");
die;
}
/**
* Authorization response validation
*/
public function response()
{
$this->plugin->debug("[{$this->id}][authorize] Response: " . $_SERVER['REQUEST_URI']);
$error = $this->response_error(
rcube_utils::get_input_value('error', rcube_utils::INPUT_GET),
rcube_utils::get_input_value('error_description', rcube_utils::INPUT_GET),
rcube_utils::get_input_value('error_uri', rcube_utils::INPUT_GET)
);
if ($error) {
// TODO: display error in UI
return;
}
$state = rcube_utils::get_input_value('state', rcube_utils::INPUT_GET);
$code = rcube_utils::get_input_value('code', rcube_utils::INPUT_GET);
if (!$state) {
$this->plugin->debug("[{$this->id}][response] State missing");
$error = $this->plugin->gettext('errorinvalidresponse');
return;
}
if ($state != $this->plugin->rc->get_request_token()) {
$this->plugin->debug("[{$this->id}][response] Invalid response state");
$error = $this->plugin->gettext('errorinvalidresponse');
return;
}
if (!$code) {
$this->plugin->debug("[{$this->id}][response] Code missing");
$error = $this->plugin->gettext('errorinvalidresponse');
return;
}
return $this->request_token($code);
}
/**
* Existing session validation
*/
public function validate_session($session)
{
$this->plugin->debug("[{$this->id}][validate] Session: " . json_encode($session));
// Sanity checks
if (empty($session) || empty($session['code']) || empty($session['validto']) || empty($session['email'])) {
$this->plugin->debug("[{$this->id}][validate] Session invalid");
return;
}
// Check expiration time
$now = new DateTime('now', new DateTimezone('UTC'));
$validto = new DateTime($session['validto'], new DateTimezone('UTC'));
if ($now >= $validto) {
$this->plugin->debug("[{$this->id}][validate] Token expired");
return;
}
// Don't refresh often than TTL/2
$validto->sub(new DateInterval(sprintf('PT%dS', $session['ttl']/2)));
if ($now < $validto) {
$this->plugin->debug("[{$this->id}][validate] Token valid, skipping refresh");
return $session;
}
// No refresh_token, not possible to refresh
if (empty($session['refresh_token'])) {
$this->plugin->debug("[{$this->id}][validate] Session cannot be refreshed");
return;
}
// Renew tokens
$info = $this->request_token($session['code'], $session['refresh_token']);
if (!empty($info)) {
// Make sure the email didn't change
if (!empty($info['email']) && $info['email'] != $session['email']) {
$this->plugin->debug("[{$this->id}][validate] Email address change");
return;
}
$session = array_merge($session, $info);
$this->plugin->debug("[{$this->id}][validate] Session valid: " . json_encode($session));
return $session;
}
}
/**
* Authentication Token request (or token refresh)
*/
protected function request_token($code, $refresh_token = null)
{
$mode = $refresh_token ? 'token-refresh' : 'token';
$url = $this->config['token_uri'] ?: ($this->config['uri'] . '/token');
$params = array(
'client_id' => $this->config['client_id'],
'client_secret' => $this->config['client_secret'],
'grant_type' => $refresh_token ? 'refresh_token' : 'authorization_code',
);
if ($refresh_token) {
$params['refresh_token'] = $refresh_token;
$params['scope'] = 'openid email offline_access';
}
else {
$params['code'] = $code;
$params['redirect_uri'] = $this->redirect_uri();
}
$post = http_build_query($params);
$this->plugin->debug("[{$this->id}][$mode] Requesting POST $url?$post");
try {
// TODO: HTTP Basic and JWT methods of client authentication
// https://openid.net/specs/openid-connect-core-1_0.html#rfc.section.9
$request = $this->get_request($url, 'POST');
// $request->setAuth($this->config['client_id'], $this->config['client_secret']);
$request->setBody($post);
$response = $request->send();
$status = $response->getStatus();
$response = $response->getBody();
$this->plugin->debug("[{$this->id}][$mode] Response: $response");
$response = @json_decode($response, true);
if ($status != 200 || !is_array($response) || !empty($response['error'])) {
$err = $this->error_message(is_array($response) ? $response['error'] : null);
throw new Exception("OpenIDC request failed with error: $err");
}
}
catch (Exception $e) {
rcube::raise_error(array(
'line' => __LINE__, 'file' => __FILE__, 'message' => $e->getMessage()),
true, false);
return;
}
// Example response: {
// "access_token":"ACCESS_TOKEN",
// "token_type":"bearer",
// "expires_in":2592000,
// "refresh_token":"REFRESH_TOKEN",
// "scope":"read",
// "uid":100101,
// "info":{"name":"Mark E. Mark","email":"mark@example.com"}
// }
if (empty($response['access_token']) || empty($response['token_type'])
|| strtolower($response['token_type']) != 'bearer'
) {
$this->plugin->debug("[{$this->id}][$mode] Error: Invalid or unsupported response");
return;
}
$ttl = $response['expires_in'] ?: 600;
$validto = new DateTime(sprintf('+%d seconds', $ttl), new DateTimezone('UTC'));
$result = array(
'code' => $code,
'access_token' => $response['access_token'],
// 'token_type' => $response['token_type'],
'validto' => $validto->format(DateTime::ISO8601),
'ttl' => $ttl,
);
if (!empty($response['refresh_token'])) {
$result['refresh_token'] = $response['refresh_token'];
}
if (!empty($response['id_token'])) {
try {
$key = $this->config['client_secret'];
if (!empty($this->config['pubkey'])) {
$pubkey = trim(preg_replace('/\r?\n[\s\t]+/', "\n", $this->config['pubkey']));
if ($keyid = openssl_pkey_get_public($pubkey)) {
$key = $keyid;
}
else {
throw new Exception("Failed to extract public key");
}
}
$jwt = new Firebase\JWT\JWT;
$jwt::$leeway = 60;
$payload = $jwt->decode($response['id_token'], $key, array_keys(Firebase\JWT\JWT::$supported_algs));
$email = $this->config['debug_email'] ?: $payload->email;
if (empty($email)) {
throw new Exception("No email address in JWT token");
}
if (!in_array($this->config['client_id'], (array) $payload->aud)) {
throw new Exception("Token audience does not match");
}
// More extended token validation
// https://openid.net/specs/openid-connect-core-1_0.html#IDTokenValidation
$result['email'] = $email;
}
catch (Exception $e) {
rcube::raise_error(array(
'line' => __LINE__, 'file' => __FILE__, 'message' => $e->getMessage()),
true, false);
return;
}
}
return $result;
}
/**
* The URL to use when redirecting the user from SSO back to Roundcube
*/
protected function redirect_uri()
{
// response_uri is useful when the Provider does not allow
// URIs with parameters. In such case set response_uri = '/sso'
// and define a redirect in http server, example for Apache:
// RewriteRule "^sso" "/roundcubemail/?_task=login&_action=sso" [L,QSA]
$redirect_params = empty($this->config['response_uri']) ? array('_action' => 'sso') : array();
$url = $this->plugin->rc->url($redirect_params, false, true);
if (!empty($this->config['response_uri'])) {
$url = unslashify(preg_replace('/\?.*$/', '', $url)) . '/' . ltrim($this->config['response_uri'], '/');
}
return $url;
}
/**
* Get HTTP/Request2 object
*/
protected function get_request($url, $type)
{
$config = array_intersect_key($this->config, array_flip(array(
'ssl_verify_peer',
'ssl_verify_host',
'ssl_cafile',
'ssl_capath',
'ssl_local_cert',
'ssl_passphrase',
'follow_redirects',
)));
return libkolab::http_request($url, $type, $config);
}
/**
* Returns (localized) user-friendly error message
*/
protected function response_error($error, $description, $uri)
{
if (empty($error)) {
return;
}
$msg = $this->error_message($error);
$this->plugin->debug("[{$this->id}] Error: $msg");
// TODO: Add URI to the message
$label = 'error' . str_replace('_', '', $error);
if ($this->plugin->rc->text_exists($label, 'kolab_sso')) {
return $this->plugin->gettext($label);
}
return $this->plugin->gettext('responseerrorunknown');
}
/**
* Returns error message for specified OpenIDC error code
*/
protected function error_message($error)
{
switch ($error) {
// OAuth2 codes
case 'invalid_request':
return "Request malformed";
case 'unauthorized_client':
return "The client is not authorized";
case 'invalid_client':
return "Client authentication failed";
case 'access_denied':
return "Request denied";
case 'unsupported_response_type':
return "Unsupported response type";
case 'invalid_grant':
return "Invalid authorization grant";
case 'unsupported_grant_type':
return "Unsupported authorization grant";
case 'invalid_scope':
return "Invalid scope";
case 'server_error':
return "Server error";
case 'temporarily_unavailable':
return "Service temporarily unavailable";
// OpenIDC codes
case 'interaction_required':
return "End-User interaction required";
case 'login_required':
return "End-User authentication required";
case 'account_selection_required':
return "End-User account selection required";
case 'consent_required':
return "End-User consent required";
case 'invalid_request_uri':
return "Invalid request_uri";
case 'invalid_request_object':
return "Invalid Request Object";
case 'request_not_supported':
return "Request param not supported";
case 'request_uri_not_supported':
return "request_uri param not supported";
case 'registration_not_supported':
return "Registration parameter not supported";
}
return "Unknown error";
}
}

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<?php
/**
* Single Sign On Authentication for Kolab
*
* @author Aleksander Machniak <machniak@kolabsys.com>
*
* Copyright (C) 2018, Kolab Systems AG <contact@kolabsys.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
class kolab_sso extends rcube_plugin
{
public $rc;
private $data;
private $driver;
private $debug = false;
/**
* Plugin initialization
*/
public function init()
{
$this->rc = rcube::get_instance();
// Disable the plugin in Syncroton, iRony, etc.
if (!($this->rc instanceof rcmail)) {
return;
}
$this->add_hook('startup', array($this, 'startup'));
$this->add_hook('ready', array($this, 'ready'));
$this->add_hook('login_after', array($this, 'ready'));
$this->add_hook('authenticate', array($this, 'authenticate'));
}
/**
* Startup hook handler
*/
public function startup($args)
{
// On login or logout (or when the session expired)...
if ($args['task'] == 'login' || $args['task'] == 'logout') {
$mode = $args['action'] == 'sso' ? $_SESSION['sso_mode'] : rcube_utils::get_input_value('_sso', rcube_utils::INPUT_GP);
// Authorization
if ($mode) {
$driver = $this->get_driver($mode);
// This is where we handle redirections from the SSO provider
if ($args['action'] == 'sso') {
$this->data = $driver->response();
if (!empty($this->data)) {
$this->data['timezone'] = $_SESSION['sso_timezone'];
$this->data['url'] = $_SESSION['sso_url'];
$this->data['mode'] = $mode;
}
}
// This is where we handle clicking one of "Login by SSO" buttons
else if ($_SESSION['temp'] && $this->rc->check_request()) {
// Remember some logon params for use on SSO response above
$_SESSION['sso_timezone'] = rcube_utils::get_input_value('_timezone', rcube_utils::INPUT_POST);
$_SESSION['sso_url'] = rcube_utils::get_input_value('_url', rcube_utils::INPUT_POST);
$_SESSION['sso_mode'] = $mode;
$driver->authorize();
}
$args['action'] = 'login';
$args['task'] = 'login';
}
}
// On valid session...
else if (isset($_SESSION['user_id'])
&& ($data = $_SESSION['sso_data'])
&& ($data = json_decode($this->rc->decrypt($data), true))
&& ($mode = $data['mode'])
) {
$driver = $this->get_driver($mode);
// Session validation, token refresh, etc.
if ($this->data = $driver->validate_session($data)) {
// register storage connection hooks
$this->authenticate(array(), true);
}
else {
// Destroy the session
$this->rc->kill_session();
// TODO: error message beter explaining the reason
// $this->rc->output->show_message('sessionferror', 'error');
}
}
// Register login form modifications
$this->add_hook('template_object_loginform', array($this, 'login_form'));
return $args;
}
/**
* Authenticate hook handler
*/
public function authenticate($args, $internal = false)
{
if (!empty($this->data) && ($email = $this->data['email'])) {
if (!$internal) {
$args['user'] = $email;
$args['pass'] = 'fake-sso-password';
$args['valid'] = true;
$args['cookiecheck'] = false;
$_POST['_timezone'] = $this->data['timezone'];
$_POST['_url'] = $this->data['url'];
}
$this->add_hook('storage_connect', array($this, 'storage_connect'));
$this->add_hook('managesieve_connect', array($this, 'storage_connect'));
$this->add_hook('smtp_connect', array($this, 'smtp_connect'));
}
return $args;
}
/**
* Login_after hook handler
*/
public function login_after($args)
{
// Between startup and authenticate the session is destroyed.
// So, we save the data later than that. Here, because of
// a redirect after successful login
if (!empty($this->data)) {
$_SESSION['sso_data'] = $this->rc->encrypt(json_encode($this->data));
}
return $args;
}
/**
* Ready hook handler
*/
public function ready($args)
{
// Between startup and authenticate the session is destroyed.
// So, we save the data later than that.
if (!empty($this->data)) {
$_SESSION['sso_data'] = $this->rc->encrypt(json_encode($this->data));
}
return $args;
}
/**
* Storage_connect/managesieve_connect hook handler
*/
public function storage_connect($args)
{
$user = $this->rc->config->get('kolab_sso_username');
$pass = $this->rc->config->get('kolab_sso_password');
if ($user && $pass) {
$args['auth_cid'] = $user;
$args['auth_pw'] = $pass;
$args['auth_type'] = 'PLAIN';
}
return $args;
}
/**
* Smtp_connect hook handler
*/
public function smtp_connect($args)
{
$user = $this->rc->config->get('kolab_sso_username');
$pass = $this->rc->config->get('kolab_sso_password');
if ($user && $pass) {
$args['smtp_auth_cid'] = $user;
$args['smtp_auth_pw'] = $pass;
$args['smtp_auth_type'] = 'PLAIN';
}
return $args;
}
/**
* Login form object
*/
public function login_form($args)
{
$this->load_config();
$options = (array) $this->rc->config->get('kolab_sso_options');
$disable_login = $this->rc->config->get('kolab_sso_disable_login');
if (empty($options)) {
return $args;
}
$doc = new DOMDocumentHelper('1.0');
$doc->loadHTML($args['content']);
$body = $doc->getElementsByTagName('body')->item(0);
if ($disable_login) {
// Remove login form inputs table
$table = $doc->getElementsByTagName('table')->item(0);
$table->parentNode->removeChild($table);
// Remove original Submit button
$submit = $doc->getElementsByTagName('button')->item(0);
$submit->parentNode->removeChild($submit);
}
if (!$this->driver) {
$this->add_texts('localization/');
}
// Add SSO form elements
$form = $doc->createNode('p', null, array('id' => 'sso-form', 'class' => 'formbuttons'), $body);
foreach ($options as $idx => $option) {
$label = array('name' => 'loginby', 'vars' => array('provider' => $option['name'] ?: $this->gettext('sso')));
$doc->createNode('button', $this->gettext($label), array(
'type' => 'button',
'value' => $idx,
'class' => 'button sso w-100',
'onclick' => 'kolab_sso_submit(this)',
), $form);
}
$doc->createNode('input', null, array('name' => '_sso', 'type' => 'hidden'), $form);
// Save the form content back
$args['content'] = preg_replace('|</?body>|', '', $doc->saveHTML($body));
// Add script
$args['content'] .= "<script>"
. "function kolab_sso_submit(button) {"
. "\$('[name=_sso]').val(button.value);"
. "\$('input[type=text],input[type=password]').attr('required', false);"
. "rcmail.gui_objects.loginform.submit();"
. "}"
. "</script>";
return $args;
}
/**
* Debug function for drivers
*/
public function debug($line)
{
if ($this->debug) {
rcube::write_log('sso', $line);
}
}
/**
* Initialize SSO driver object
*/
private function get_driver($name)
{
if ($this->driver) {
return $this->driver;
}
$this->load_config();
$this->add_texts('localization/');
$options = (array) $this->rc->config->get('kolab_sso_options');
$options = (array) $options[$name];
$driver = $options['driver'] ?: 'openidc';
$class = "kolab_sso_$driver";
if (empty($options) || !file_exists($this->home . "/drivers/$driver.php")) {
rcube::raise_error(array(
'line' => __LINE__, 'file' => __FILE__,
'message' => "Unable to find SSO driver"
), true, true);
}
// Add /lib to include_path
$include_path = $this->home . '/lib' . PATH_SEPARATOR;
$include_path .= ini_get('include_path');
set_include_path($include_path);
require_once $this->home . "/drivers/$driver.php";
$this->debug = $this->rc->config->get('kolab_sso_debug');
$this->driver = new $class($this, $options);
return $this->driver;
}
}
/**
* DOMDocument wrapper with some shortcut method
*/
class DOMDocumentHelper extends DOMDocument
{
public function createNode($name, $value = null, $args = array(), $parent = null, $prepend = false)
{
$node = parent::createElement($name);
if ($value) {
$node->appendChild(new DOMText(rcube::Q($value)));
}
foreach ($args as $attr_name => $attr_value) {
$node->setAttribute($attr_name, $attr_value);
}
if ($parent) {
if ($prepend && $parent->firstChild) {
$parent->insertBefore($node, $parent->firstChild);
}
else {
$parent->appendChild($node);
}
}
return $node;
}
}

7
plugins/kolab_sso/lib/Firebase/JWT/BeforeValidException.php Normal file
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<?php
namespace Firebase\JWT;
class BeforeValidException extends \UnexpectedValueException
{
}

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plugins/kolab_sso/lib/Firebase/JWT/ExpiredException.php Normal file
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<?php
namespace Firebase\JWT;
class ExpiredException extends \UnexpectedValueException
{
}

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plugins/kolab_sso/lib/Firebase/JWT/JWT.php Normal file
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<?php
namespace Firebase\JWT;
use \DomainException;
use \InvalidArgumentException;
use \UnexpectedValueException;
use \DateTime;
/**
* JSON Web Token implementation, based on this spec:
* https://tools.ietf.org/html/rfc7519
*
* PHP version 5
*
* @category Authentication
* @package Authentication_JWT
* @author Neuman Vong <neuman@twilio.com>
* @author Anant Narayanan <anant@php.net>
* @license http://opensource.org/licenses/BSD-3-Clause 3-clause BSD
* @link https://github.com/firebase/php-jwt
*/
class JWT
{
/**
* When checking nbf, iat or expiration times,
* we want to provide some extra leeway time to
* account for clock skew.
*/
public static $leeway = 0;
/**
* Allow the current timestamp to be specified.
* Useful for fixing a value within unit testing.
*
* Will default to PHP time() value if null.
*/
public static $timestamp = null;
public static $supported_algs = array(
'HS256' => array('hash_hmac', 'SHA256'),
'HS512' => array('hash_hmac', 'SHA512'),
'HS384' => array('hash_hmac', 'SHA384'),
'RS256' => array('openssl', 'SHA256'),
'RS384' => array('openssl', 'SHA384'),
'RS512' => array('openssl', 'SHA512'),
);
/**
* Decodes a JWT string into a PHP object.
*
* @param string $jwt The JWT
* @param string|array $key The key, or map of keys.
* If the algorithm used is asymmetric, this is the public key
* @param array $allowed_algs List of supported verification algorithms
* Supported algorithms are 'HS256', 'HS384', 'HS512' and 'RS256'
*
* @return object The JWT's payload as a PHP object
*
* @throws UnexpectedValueException Provided JWT was invalid
* @throws SignatureInvalidException Provided JWT was invalid because the signature verification failed
* @throws BeforeValidException Provided JWT is trying to be used before it's eligible as defined by 'nbf'
* @throws BeforeValidException Provided JWT is trying to be used before it's been created as defined by 'iat'
* @throws ExpiredException Provided JWT has since expired, as defined by the 'exp' claim
*
* @uses jsonDecode
* @uses urlsafeB64Decode
*/
public static function decode($jwt, $key, array $allowed_algs = array())
{
$timestamp = is_null(static::$timestamp) ? time() : static::$timestamp;
if (empty($key)) {
throw new InvalidArgumentException('Key may not be empty');
}
$tks = explode('.', $jwt);
if (count($tks) != 3) {
throw new UnexpectedValueException('Wrong number of segments');
}
list($headb64, $bodyb64, $cryptob64) = $tks;
if (null === ($header = static::jsonDecode(static::urlsafeB64Decode($headb64)))) {
throw new UnexpectedValueException('Invalid header encoding');
}
if (null === $payload = static::jsonDecode(static::urlsafeB64Decode($bodyb64))) {
throw new UnexpectedValueException('Invalid claims encoding');
}
if (false === ($sig = static::urlsafeB64Decode($cryptob64))) {
throw new UnexpectedValueException('Invalid signature encoding');
}
if (empty($header->alg)) {
throw new UnexpectedValueException('Empty algorithm');
}
if (empty(static::$supported_algs[$header->alg])) {
throw new UnexpectedValueException('Algorithm not supported');
}
if (!in_array($header->alg, $allowed_algs)) {
throw new UnexpectedValueException('Algorithm not allowed');
}
if (is_array($key) || $key instanceof \ArrayAccess) {
if (isset($header->kid)) {
if (!isset($key[$header->kid])) {
throw new UnexpectedValueException('"kid" invalid, unable to lookup correct key');
}
$key = $key[$header->kid];
} else {
throw new UnexpectedValueException('"kid" empty, unable to lookup correct key');
}
}
// Check the signature
if (!static::verify("$headb64.$bodyb64", $sig, $key, $header->alg)) {
throw new SignatureInvalidException('Signature verification failed');
}
// Check if the nbf if it is defined. This is the time that the
// token can actually be used. If it's not yet that time, abort.
if (isset($payload->nbf) && $payload->nbf > ($timestamp + static::$leeway)) {
throw new BeforeValidException(
'Cannot handle token prior to ' . date(DateTime::ISO8601, $payload->nbf)
);
}
// Check that this token has been created before 'now'. This prevents
// using tokens that have been created for later use (and haven't
// correctly used the nbf claim).
if (isset($payload->iat) && $payload->iat > ($timestamp + static::$leeway)) {
throw new BeforeValidException(
'Cannot handle token prior to ' . date(DateTime::ISO8601, $payload->iat)
);
}
// Check if this token has expired.
if (isset($payload->exp) && ($timestamp - static::$leeway) >= $payload->exp) {
throw new ExpiredException('Expired token');
}
return $payload;
}
/**
* Converts and signs a PHP object or array into a JWT string.
*
* @param object|array $payload PHP object or array
* @param string $key The secret key.
* If the algorithm used is asymmetric, this is the private key
* @param string $alg The signing algorithm.
* Supported algorithms are 'HS256', 'HS384', 'HS512' and 'RS256'
* @param mixed $keyId
* @param array $head An array with header elements to attach
*
* @return string A signed JWT
*
* @uses jsonEncode
* @uses urlsafeB64Encode
*/
public static function encode($payload, $key, $alg = 'HS256', $keyId = null, $head = null)
{
$header = array('typ' => 'JWT', 'alg' => $alg);
if ($keyId !== null) {
$header['kid'] = $keyId;
}
if ( isset($head) && is_array($head) ) {
$header = array_merge($head, $header);
}
$segments = array();
$segments[] = static::urlsafeB64Encode(static::jsonEncode($header));
$segments[] = static::urlsafeB64Encode(static::jsonEncode($payload));
$signing_input = implode('.', $segments);
$signature = static::sign($signing_input, $key, $alg);
$segments[] = static::urlsafeB64Encode($signature);
return implode('.', $segments);
}
/**
* Sign a string with a given key and algorithm.
*
* @param string $msg The message to sign
* @param string|resource $key The secret key
* @param string $alg The signing algorithm.
* Supported algorithms are 'HS256', 'HS384', 'HS512' and 'RS256'
*
* @return string An encrypted message
*
* @throws DomainException Unsupported algorithm was specified
*/
public static function sign($msg, $key, $alg = 'HS256')
{
if (empty(static::$supported_algs[$alg])) {
throw new DomainException('Algorithm not supported');
}
list($function, $algorithm) = static::$supported_algs[$alg];
switch($function) {
case 'hash_hmac':
return hash_hmac($algorithm, $msg, $key, true);
case 'openssl':
$signature = '';
$success = openssl_sign($msg, $signature, $key, $algorithm);
if (!$success) {
throw new DomainException("OpenSSL unable to sign data");
} else {
return $signature;
}
}
}
/**
* Verify a signature with the message, key and method. Not all methods
* are symmetric, so we must have a separate verify and sign method.
*
* @param string $msg The original message (header and body)
* @param string $signature The original signature
* @param string|resource $key For HS*, a string key works. for RS*, must be a resource of an openssl public key
* @param string $alg The algorithm
*
* @return bool
*
* @throws DomainException Invalid Algorithm or OpenSSL failure
*/
private static function verify($msg, $signature, $key, $alg)
{
if (empty(static::$supported_algs[$alg])) {
throw new DomainException('Algorithm not supported');
}
list($function, $algorithm) = static::$supported_algs[$alg];
switch($function) {
case 'openssl':
$success = openssl_verify($msg, $signature, $key, $algorithm);
if ($success === 1) {
return true;
} elseif ($success === 0) {
return false;
}
// returns 1 on success, 0 on failure, -1 on error.
throw new DomainException(
'OpenSSL error: ' . openssl_error_string()
);
case 'hash_hmac':
default:
$hash = hash_hmac($algorithm, $msg, $key, true);
if (function_exists('hash_equals')) {
return hash_equals($signature, $hash);
}
$len = min(static::safeStrlen($signature), static::safeStrlen($hash));
$status = 0;
for ($i = 0; $i < $len; $i++) {
$status |= (ord($signature[$i]) ^ ord($hash[$i]));
}
$status |= (static::safeStrlen($signature) ^ static::safeStrlen($hash));
return ($status === 0);
}
}
/**
* Decode a JSON string into a PHP object.
*
* @param string $input JSON string
*
* @return object Object representation of JSON string
*
* @throws DomainException Provided string was invalid JSON
*/
public static function jsonDecode($input)
{
if (version_compare(PHP_VERSION, '5.4.0', '>=') && !(defined('JSON_C_VERSION') && PHP_INT_SIZE > 4)) {
/** In PHP >=5.4.0, json_decode() accepts an options parameter, that allows you
* to specify that large ints (like Steam Transaction IDs) should be treated as
* strings, rather than the PHP default behaviour of converting them to floats.
*/
$obj = json_decode($input, false, 512, JSON_BIGINT_AS_STRING);
} else {
/** Not all servers will support that, however, so for older versions we must
* manually detect large ints in the JSON string and quote them (thus converting
*them to strings) before decoding, hence the preg_replace() call.
*/
$max_int_length = strlen((string) PHP_INT_MAX) - 1;
$json_without_bigints = preg_replace('/:\s*(-?\d{'.$max_int_length.',})/', ': "$1"', $input);
$obj = json_decode($json_without_bigints);
}
if (function_exists('json_last_error') && $errno = json_last_error()) {
static::handleJsonError($errno);
} elseif ($obj === null && $input !== 'null') {
throw new DomainException('Null result with non-null input');
}
return $obj;
}
/**
* Encode a PHP object into a JSON string.
*
* @param object|array $input A PHP object or array
*
* @return string JSON representation of the PHP object or array
*
* @throws DomainException Provided object could not be encoded to valid JSON
*/
public static function jsonEncode($input)
{
$json = json_encode($input);
if (function_exists('json_last_error') && $errno = json_last_error()) {
static::handleJsonError($errno);
} elseif ($json === 'null' && $input !== null) {
throw new DomainException('Null result with non-null input');
}
return $json;
}
/**
* Decode a string with URL-safe Base64.
*
* @param string $input A Base64 encoded string
*
* @return string A decoded string
*/
public static function urlsafeB64Decode($input)
{
$remainder = strlen($input) % 4;
if ($remainder) {
$padlen = 4 - $remainder;
$input .= str_repeat('=', $padlen);
}
return base64_decode(strtr($input, '-_', '+/'));
}
/**
* Encode a string with URL-safe Base64.
*
* @param string $input The string you want encoded
*
* @return string The base64 encode of what you passed in
*/
public static function urlsafeB64Encode($input)
{
return str_replace('=', '', strtr(base64_encode($input), '+/', '-_'));
}
/**
* Helper method to create a JSON error.
*
* @param int $errno An error number from json_last_error()
*
* @return void
*/
private static function handleJsonError($errno)
{
$messages = array(
JSON_ERROR_DEPTH => 'Maximum stack depth exceeded',
JSON_ERROR_STATE_MISMATCH => 'Invalid or malformed JSON',
JSON_ERROR_CTRL_CHAR => 'Unexpected control character found',
JSON_ERROR_SYNTAX => 'Syntax error, malformed JSON',
JSON_ERROR_UTF8 => 'Malformed UTF-8 characters' //PHP >= 5.3.3
);
throw new DomainException(
isset($messages[$errno])
? $messages[$errno]
: 'Unknown JSON error: ' . $errno
);
}
/**
* Get the number of bytes in cryptographic strings.
*
* @param string
*
* @return int
*/
private static function safeStrlen($str)
{
if (function_exists('mb_strlen')) {
return mb_strlen($str, '8bit');
}
return strlen($str);
}
}

7
plugins/kolab_sso/lib/Firebase/JWT/SignatureInvalidException.php Normal file
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<?php
namespace Firebase\JWT;
class SignatureInvalidException extends \UnexpectedValueException
{
}

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plugins/kolab_sso/localization/en_US.inc Normal file
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<?php
$labels['loginby'] = 'Login by $provider';
$labels['sso'] = 'Single Sign On';