CI框架源码阅读---------Security.php
'[removed]', 'document.write' => '[removed]', '.parentNode' => '[removed]', '.innerHTML' => '[removed]', 'window.location' => '[removed]', '-moz-binding' => '[removed]', '' => '-->', ' '' => '' ); /* never allowed, regex replacement */ /** * List of never allowed regex replacement * 不允许的正则替换字符串列表 * @var array * @access protected */ protected $_never_allowed_regex = array( 'javascript\s*:', 'expression\s*(\(|&\#40;)', // CSS and IE 'vbscript\s*:', // IE, surprise! 'Redirect\s+302', "([\"'])?data\s*:[^\\1]*?base64[^\\1]*?,[^\\1]*?\\1?" ); /** * Constructor * * @return void */ public function __construct() { // Is CSRF protection enabled? // csrf 是否开启 if (config_item('csrf_protection') === TRUE) { // CSRF config 读取CSRF 配置并赋值给本类下的对应的属性 foreach (array('csrf_expire', 'csrf_token_name', 'csrf_cookie_name') as $key) { if (FALSE !== ($val = config_item($key))) { $this->{'_'.$key} = $val; } } // Append application specific cookie prefix // 添加应用指定的cookie前缀 if (config_item('cookie_prefix')) { $this->_csrf_cookie_name = config_item('cookie_prefix').$this->_csrf_cookie_name; } // Set the CSRF hash // 设置CSRF hash $this->_csrf_set_hash(); } log_message('debug', "Security Class Initialized"); } // -------------------------------- /** * Verify Cross Site Request Forgery Protection * 验证跨站请求伪造保护 * @return object */ public function csrf_verify() { // If it's not a POST request we will set the CSRF cookie // 如果不是post请求我们要设置 CSRF cookie if (strtoupper($_SERVER['REQUEST_METHOD']) !== 'POST') { return $this->csrf_set_cookie(); } // Do the tokens exist in both the _POST and _COOKIE arrays? // 如果请求令牌不存在，调用csrf_show_error 报错 if ( ! isset($_POST[$this->_csrf_token_name], $_COOKIE[$this->_csrf_cookie_name])) { $this->csrf_show_error(); } // Do the tokens match? // 如果令牌不对，报错。 if ($_POST[$this->_csrf_token_name] != $_COOKIE[$this->_csrf_cookie_name]) { $this->csrf_show_error(); } // We kill this since we're done and we don't want to // polute the _POST array // 销毁领牌子，因为我们不想污染_POST 数组 unset($_POST[$this->_csrf_token_name]); // Nothing should last forever // 销毁cookie名 并重新设置hash和cookie unset($_COOKIE[$this->_csrf_cookie_name]); $this->_csrf_set_hash(); $this->csrf_set_cookie(); log_message('debug', 'CSRF token verified'); return $this; } // -------------------------------- /** * Set Cross Site Request Forgery Protection Cookie * 设置伪造cookie保护跨站请求 * @return object */ public function csrf_set_cookie() { $expire = time() + $this->_csrf_expire; $secure_cookie = (config_item('cookie_secure') === TRUE) ? 1 : 0; // 当存在https时设置cookie if ($secure_cookie && (empty($_SERVER['HTTPS']) OR strtolower($_SERVER['HTTPS']) === 'off')) { return FALSE; } // 设置cookie setcookie($this->_csrf_cookie_name, $this->_csrf_hash, $expire, config_item('cookie_path'), config_item('cookie_domain'), $secure_cookie); log_message('debug', "CRSF cookie Set"); return $this; } // -------------------------------- /** * Show CSRF Error * 显示CSRF错误 * @return void */ public function csrf_show_error() { show_error('The action you have requested is not allowed.'); } // -------------------------------- /** * Get CSRF Hash * 获取CSRF hash * Getter Method * * @return string self::_csrf_hash */ public function get_csrf_hash() { return $this->_csrf_hash; } // -------------------------------- /** * Get CSRF Token Name * 获取CSRF 令排名 * Getter Method * * @return string self::csrf_token_name */ public function get_csrf_token_name() { return $this->_csrf_token_name; } // -------------------------------- /** * XSS Clean * * Sanitizes 清理 data so that Cross Site Scripting Hacks can be * prevented.阻止 This function does a fair amount of work but * it is extremely thorough, designed to prevent even the * most obscure XSS attempts 企图. Nothing is ever 100% foolproof, * of course, but I haven't been able to get anything passed * the filter. * 对数据进行过滤，从而可以防止跨站脚本攻击。这个函数做了一些工作，但是它是非常彻底的， * 甚至可以防止大多数模糊的XSS企图。当然，没有什么是100%安全的， * 但是我们在这个过滤器中已经做了所欲我们所能做想到的了。 * * Note: This function should only be used to deal with data * upon submission. It's not something that should * be used for general runtime processing. * 注意：这个函数只能用来处理已经提交的数据。 * 在通常的运行过程中，不应该使用该函数。 * * This function was based in part on some code and ideas I * got from Bitflux: http://channel.bitflux.ch/wiki/XSS_Prevention * * To help develop this script I used this great list of * vulnerabilities along with a few other hacks I've * harvested from examining vulnerabilities in other programs: * http://ha.ckers.org/xss.html * * @param mixed string or array * @param bool * @return string */ public function xss_clean($str, $is_image = FALSE) { /* * Is the string an array? * 需要过滤的字符串是数组吗？ * */ if (is_array($str)) { while (list($key) = each($str)) { $str[$key] = $this->xss_clean($str[$key]); } return $str; } /* * Remove Invisible Characters * 移除不可见字符 */ $str = remove_invisible_characters($str); // Validate Entities in URLs // 验证在URL中的字符实体 $str = $this->_validate_entities($str); /* * URL Decode * URL解码 * Just in case stuff like this is submitted: * 防止下面这样的东西提交 * Google * * Note: Use rawurldecode() so it does not remove plus signs * rawurldecode() 不会把加号（'+'）解码为空格，而 urldecode() 可以。 * */ $str = rawurldecode($str); /* * Convert character entities to ASCII * 把实体字符转换成ASCII码 * 这使得我们下面的测试是可靠的，我们仅仅转换实体内的标签，因为这些是会造成安全问题的实体 * This permits our tests below to work reliably. * We only convert entities that are within tags since * these are the ones that will pose security problems. * */ $str = preg_replace_callback("/[a-z]+=([\'\"]).*?\\1/si", array($this, '_convert_attribute'), $str); $str = preg_replace_callback("/|_do_never_allowed($str); /* * Makes PHP tags safe * 使PHP标签安全 * Note: XML tags are inadvertently replaced too: * 注意： XML标签也会被无意的替换 * '), array('', '?>'), $str); } /* * Compact any exploded words * 压缩所有分解了的单词 * This corrects words like: j a v a s c r i p t * These words are compacted back to their correct state. */ $words = array( 'javascript', 'expression', 'vbscript', 'script', 'base64', 'applet', 'alert', 'document', 'write', 'cookie', 'window' ); foreach ($words as $word) { $temp = ''; for ($i = 0, $wordlen = strlen($word); $i ]*?)(>|$)#si", array($this, '_js_link_removal'), $str); } if (preg_match("/ ]*?)(\s?/?>|$)#si", array($this, '_js_img_removal'), $str); } if (preg_match("/script/i", $str) OR preg_match("/xss/i", $str)) { $str = preg_replace("##si", '[removed]', $str); } } while($original != $str); unset($original); // Remove evil attributes such as style, onclick and xmlns // 移除有害的属性，比如style ， onclick ， xmlns $str = $this->_remove_evil_attributes($str, $is_image); /* * Sanitize naughty HTML elements * 清理不适当的HTML元素 * If a tag containing any of the words in the list * below is found, the tag gets converted to entities. * 如果一个标签包含任何一个下面列表中的单词，这个标签转换为一个字符实体 * So this:
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