CI框架源码阅览-Security.php

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: 		 * Becomes: 		 */		$naughty = 'alert|applet|audio|basefont|base|behavior|bgsound|blink|body|embed|expression|form|frameset|frame|head|html|ilayer|iframe|input|isindex|layer|link|meta|object|plaintext|style|script|textarea|title|video|xml|xss';		$str = preg_replace_callback('#_do_never_allowed($str);		/*		 * Images are Handled in a Special Way		 * - Essentially, we want to know that after all of the character		 * conversion is done whether any unwanted, likely XSS, code was found.		 * If not, we return TRUE, as the image is clean.		 * However, if the string post-conversion does not matched the		 * string post-removal of XSS, then it fails, as there was unwanted XSS		 * code found and removed/changed during processing.		 */		if ($is_image === TRUE)		{			return ($str == $converted_string) ? TRUE: FALSE;		}		log_message('debug', "XSS Filtering completed");		return $str;	}	// --------------------------------	/**	 * Random Hash for protecting URLs	 * 随即生成一个_xss_hssh	 * @return	string	 */	public function xss_hash()	{		if ($this->_xss_hash == '')		{			mt_srand();			$this->_xss_hash = md5(time() + mt_rand(0, 1999999999));		}		return $this->_xss_hash;	}	// --------------------------------	/**	 * HTML Entities Decode	 * HTML 实体解码	 * This function is a replacement for html_entity_decode()	 * 这个函数用来替换 html_entity_decode()函数	 * The reason we are not using html_entity_decode() by itself is because	 * while it is not technically技术上 correct to leave out the semicolon	 * at the end of an entity most browsers will still interpret the entity	 * correctly.  html_entity_decode() does not convert entities without	 * semicolons, so we are left with our own little solution here. Bummer.	 * 当编码字符后没有写；时，大部分浏览器都能够正确的解释代码，但是，html_entity_decode将不会解释它	 * html_entity_decode()不会转换没有分号的实体，所以使用自己的解决方案	 * @param	string	 * @param	string	 * @return	string	 */	public function entity_decode($str, $charset='UTF-8')	{		if (stristr($str, '&') === FALSE)		{			return $str;		}		$str = html_entity_decode($str, ENT_COMPAT, $charset);		$str = preg_replace('~(0*[0-9a-f]{2,5})~ei', 'chr(hexdec("\\1"))', $str);		return preg_replace('~([0-9]{2,4})~e', 'chr(\\1)', $str);	}	// --------------------------------	/**	 * Filename Security	 * 文件名安全	 * @param	string	 * @param 	bool	 * @return	string	 */	public function sanitize_filename($str, $relative_path = FALSE)	{		$bad = array(			"../",			"",			"",			"'",			'"',			'&',			'$',			'#',			'{',			'}',			'[',			']',			'=',			';',			'?',			"%20",			"%22",			"%3c",		// 			"%0e",		// >			"%28",		// (			"%29",		// )			"%2528",	// (			"%26",		// &			"%24",		// $			"%3f",		// ?			"%3b",		// ;			"%3d"		// =		);		if ( ! $relative_path)		{			$bad[] = './';			$bad[] = '/';		}		$str = remove_invisible_characters($str, FALSE);		return stripslashes(str_replace($bad, '', $str));	}	// ----------------------------	/**	 * Compact Exploded Words	 * 压缩搜索到得单词	 * Callback function for xss_clean() to remove whitespace from	 * things like j a v a s c r i p t	 * 回调函数，用于xss_clean()，从类似于 j a v a s c r i p t中移除空格     * 	 *	 * @param	type	 * @return	type	 */	protected function _compact_exploded_words($matches)	{		return preg_replace('/\s+/s', '', $matches[1]).$matches[2];	}	// --------------------------------	/*	 * Remove Evil HTML Attributes (like evenhandlers and style)	 * 移除有害的html属性，（像事件处理和样式）	 * It removes the evil attribute and either:	 * 	- Everything up until a space	 *		For example, everything between the pipes:	 *			 * 	- Everything inside the quotes	 *		For example, everything between the pipes:	 *			 *	 * @param string $str The string to check	 * @param boolean $is_image TRUE if this is an image	 * @return string The string with the evil attributes removed	 */	protected function _remove_evil_attributes($str, $is_image)	{		// All javascript event handlers (e.g. onload, onclick, onmouseover), style, and xmlns		// 所有的havascript事件处理器		$evil_attributes = array('on\w*', 'style', 'xmlns', 'formaction');		if ($is_image === TRUE)		{			/*			 * Adobe Photoshop puts XML metadata into JFIF images, 			 * including namespacing, so we have to allow this for images.			 * Adobe Photoshop在JFIF图片中放入了XML元数据			 * 包含命名空间，所以我们必须对图片允许这些			 */			unset($evil_attributes[array_search('xmlns', $evil_attributes)]);		}		do {			$count = 0;			$attribs = array();			// find occurrences of illegal attribute strings without quotes			// 找出没有加引号的的不合法的属性			preg_match_all('/('.implode('|', $evil_attributes).')\s*=\s*([^\s>]*)/is', $str, $matches, PREG_SET_ORDER);			foreach ($matches as $attr)			{				$attribs[] = preg_quote($attr[0], '/');			}			// find occurrences of illegal 非法 attribute strings with quotes (042 and 047 are octal quotes)			// 找出没有引号的不合法属性（042，4,0是八进制引号）			preg_match_all("/(".implode('|', $evil_attributes).")\s*=\s*(\042|\047)([^\\2]*?)(\\2)/is",  $str, $matches, PREG_SET_ORDER);			foreach ($matches as $attr)			{				$attribs[] = preg_quote($attr[0], '/');			}			// replace illegal attribute strings that are inside an html tag			// 替换html标签中的非法属性			if (count($attribs) > 0)			{				$str = preg_replace("/\-])(.*?)(".implode('|', $attribs).")(.*?)([\s>', '', '_filter_attributes(str_replace(array(''), '', $match[1]))			),			$match[0]		);	}	// --------------------------------	/**	 * JS Image Removal	 * js图片清理	 * Callback function for xss_clean() to sanitize image tags	 * This limits the PCRE backtracks, making it more performance friendly	 * and prevents PREG_BACKTRACK_LIMIT_ERROR from being triggered in	 * PHP 5.2+ on image tag heavy strings	 *	 * @param	array	 * @return	string	 */	protected function _js_img_removal($match)	{		return str_replace(			$match[1],			preg_replace(				'#src=.*?(alert\(|alert&\#40;|javascript\:|livescript\:|mocha\:|charset\=|window\.|document\.|\.cookie|

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