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https://github.com/phpbb/phpbb.git
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Okay, that is pretty raw, but better to have it in place than trying to play catch-up. Introducing an early stage of CAPTCHA modules.
git-svn-id: file:///svn/phpbb/trunk@8889 89ea8834-ac86-4346-8a33-228a782c2dd0
This commit is contained in:
Henry Sudhof
301
phpBB/includes/captcha/plugins/captcha_abstract.php
Executable file
301
phpBB/includes/captcha/plugins/captcha_abstract.php
Executable file
@@ -0,0 +1,301 @@
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<?
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/**
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*
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* @package VC
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* @version $Id: $
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* @copyright (c) 2006 2008 phpBB Group
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* @license http://opensource.org/licenses/gpl-license.php GNU Public License
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*
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*/
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/**
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* @ignore
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*/
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if (!defined('IN_PHPBB'))
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{
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exit;
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}
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/**
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* This class holds the code shared by the two default 3.0 CAPTCHAs.
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*/
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abstract class phpbb_default_captcha implements phpbb_captcha_plugin
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{
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protected $confirm_id;
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protected $confirm_code;
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protected $code;
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protected $seed;
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protected $type;
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protected $solved = false;
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function init($type)
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{
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global $config, $db, $user;
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// read input
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$this->confirm_id = request_var('confirm_id', '');
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$this->confirm_code = request_var('confirm_code', '');
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$this->type = (int) $type;
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if (!strlen($this->confirm_id))
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{
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// we have no confirm ID, better get ready to display something
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$this->generate_code();
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}
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}
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function execute_demo()
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{
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global $user;
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$this->code = gen_rand_string(mt_rand(5, 8));
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$this->seed = hexdec(substr(unique_id(), 4, 10));
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// compute $seed % 0x7fffffff
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$this->seed -= 0x7fffffff * floor($this->seed / 0x7fffffff);
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captcha::execute($this->code, $this->seed);
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}
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function execute()
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{
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if (empty($this->code))
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{
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if (!$this->load_code())
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{
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// invalid request, bail out
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return false;
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}
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}
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captcha::execute($this->code, $this->seed);
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}
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function get_template()
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{
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global $config, $user, $template;
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$template->set_filenames(array(
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'captcha' => 'captcha_default.html')
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);
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$template->assign_vars(array(
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'CONFIRM_IMAGE' => append_sid('ucp', 'mode=confirm&confirm_id=' . $this->confirm_id . '&type=' . $this->type),
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'CONFIRM_ID' => $this->confirm_id,
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));
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return $template->assign_display('captcha');
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}
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function get_demo_template($id)
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{
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global $config, $user, $template;
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$template->set_filenames(array(
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'captcha_demo' => 'captcha_default_acp_demo.html')
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);
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// acp_captcha has a delivery function; let's use it
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$template->assign_vars(array(
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'CONFIRM_IMAGE' => append_sid(PHPBB_ADMIN_PATH . 'index.' . PHP_EXT, 'captcha_demo=1&mode=visual&i=' . $id . '&select_captcha=' . $this->get_class_name()),
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'CONFIRM_ID' => $this->confirm_id,
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));
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return $template->assign_display('captcha_demo');
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}
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function get_hidden_fields()
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{
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$hidden_fields = array();
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// this is required for postig.php - otherwise we would forget about the captcha being already solved
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if ($this->solved)
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{
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$hidden_fields['confirm_code'] = $this->confirm_code;
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}
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$hidden_fields['confirm_id'] = $this->confirm_id;
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return $hidden_fields;
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}
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static function garbage_collect($type)
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{
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global $db, $config;
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$sql = 'SELECT DISTINCT c.session_id
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FROM ' . CONFIRM_TABLE . ' c
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LEFT JOIN ' . SESSIONS_TABLE . ' s ON (c.session_id = s.session_id)
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WHERE s.session_id IS NULL' .
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((empty($type)) ? '' : ' AND c.confirm_type = ' . (int) $type);
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$result = $db->sql_query($sql);
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if ($row = $db->sql_fetchrow($result))
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{
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$sql_in = array();
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do
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{
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$sql_in[] = (string) $row['session_id'];
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}
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while ($row = $db->sql_fetchrow($result));
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if (sizeof($sql_in))
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{
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$sql = 'DELETE FROM ' . CONFIRM_TABLE . '
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WHERE ' . $db->sql_in_set('session_id', $sql_in);
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$db->sql_query($sql);
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}
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}
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$db->sql_freeresult($result);
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}
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function uninstall()
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{
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self::garbage_collect(0);
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}
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function install()
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{
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return;
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}
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function validate()
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{
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global $config, $db, $user;
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$this->confirm_code = request_var('confirm_code', '');
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if (!$this->confirm_id)
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{
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$error = $user->lang['CONFIRM_CODE_WRONG'];
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}
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else
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{
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if ($this->check_code())
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{
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// $this->delete_code(); commented out to allow posting.php to repeat the question
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$this->solved = true;
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}
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else
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{
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$error = $user->lang['CONFIRM_CODE_WRONG'];
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}
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}
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if (strlen($error))
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{
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// okay, inorect answer. Let's ask a new question
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$this->reset();
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return $error;
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}
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else
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{
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return false;
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}
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}
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/**
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* The old way to generate code, suitable for GD and non-GD. Resets the internal state.
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*/
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protected function generate_code()
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{
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global $db, $user;
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$this->code = gen_rand_string(mt_rand(5, 8));
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$this->confirm_id = md5(unique_id($user->ip));
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$this->seed = hexdec(substr(unique_id(), 4, 10));
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$this->solved = false;
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// compute $seed % 0x7fffffff
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$this->seed -= 0x7fffffff * floor($this->seed / 0x7fffffff);
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$sql = 'INSERT INTO ' . CONFIRM_TABLE . ' ' . $db->sql_build_array('INSERT', array(
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'confirm_id' => (string) $this->confirm_id,
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'session_id' => (string) $user->session_id,
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'confirm_type' => (int) $this->type,
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'code' => (string) $this->code,
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'seed' => (int) $this->seed)
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);
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$db->sql_query($sql);
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}
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/**
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* Look up everything we need for painting&checking.
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*/
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protected function load_code()
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{
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global $db, $user;
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$sql = 'SELECT code, seed
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FROM ' . CONFIRM_TABLE . "
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WHERE confirm_id = '" . $db->sql_escape($this->confirm_id) . "'
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AND session_id = '" . $db->sql_escape($user->session_id) . "'
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AND confirm_type = " . $this->type;
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$result = $db->sql_query($sql);
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$row = $db->sql_fetchrow($result);
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$db->sql_freeresult($result);
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if ($row)
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{
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$this->code = $row['code'];
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$this->seed = $row['seed'];
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return true;
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}
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return false;
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}
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protected function check_code()
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{
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global $db;
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if (empty($this->code))
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{
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if (!$this->load_code())
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{
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return false;
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}
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}
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return (strcasecmp($this->code, $this->confirm_code) === 0);
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}
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protected function delete_code()
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{
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global $db, $user;
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$sql = 'DELETE FROM ' . CONFIRM_TABLE . "
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WHERE confirm_id = '" . $db->sql_escape($confirm_id) . "'
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AND session_id = '" . $db->sql_escape($user->session_id) . "'
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AND confirm_type = " . $this->type;
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$db->sql_query($sql);
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}
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function get_attempt_count()
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{
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global $db, $user;
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$sql = 'SELECT COUNT(session_id) AS attempts
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FROM ' . CONFIRM_TABLE . "
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WHERE session_id = '" . $db->sql_escape($user->session_id) . "'
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AND confirm_type = " . $this->type;
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$result = $db->sql_query($sql);
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$attempts = (int) $db->sql_fetchfield('attempts');
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$db->sql_freeresult($result);
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return $attempts;
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}
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function reset()
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{
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global $db, $user;
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$sql = 'DELETE FROM ' . CONFIRM_TABLE . "
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WHERE session_id = '" . $db->sql_escape($user->session_id) . "'
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AND confirm_type = " . (int) $this->type;
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$db->sql_query($sql);
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// we leave the class usable by generating a new question
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$this->generate_code();
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}
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}
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