XssHttpServletRequestWrapper过滤器
XssHttpServletRequestWrapper过滤器 先定义需要过滤的变量如下：private static final String EVENTS = "((?i)onclick|oncontextmenu|ondblclick|onmousedown|onmouseenter|onmouseleave|" +"onmousemove|onmouse...
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XssHttpServletRequestWrapper过滤器 先定义需要过滤的变量如下：
private static final String EVENTS = "((?i)onclick|oncontextmenu|ondblclick|onmousedown|onmouseenter|onmouseleave|" +
"onmousemove|onmouseover|onmouseout|onmouseup|onkeydown|onkeypress|onkeyup|onabort|onbeforeunload|onerror|" +
"onhashchange|onload|onpageshow|onpagehide|onresize|onscroll|onunload|onblur|onchange|onfocus|onfocusin|" +
"onfocusout|oninput|onreset|onsearch|onselect|onsubmit|oncopy|oncut|onpaste|onafterprint|onbeforeprint|" +
"ondrag|ondragend|ondragenter|ondragleave|ondragover|ondragstart|ondrop|onabort|oncanplay|oncanplaythrough|" +
"ondurationchange|onemptied|onended|onerror|onloadeddata|onloadedmetadata|onloadstart|onpause|onplay|" +
"onplaying|onprogress|onratechange|onseeked|onseeking|onstalled|onsuspend|ontimeupdate|onvolumechange|" +
"onwaiting|animationend|animationiteration|animationstart|transitionend|onmessage|onmousewheel|ononline|" +
"onoffline|onpopstate|onshow|onstorage|ontoggle|onwheel|CAPTURING-PHASE|AT-TARGET|BUBBLING-PHASE|bubbles|" +
"cancelable|currentTarget|eventPhase|timeStamp|initEvent|preventDefault|stopPropagation|" +
"addEventListener|dispatchEvent|removeEventListener|handleEvent|createEvent|altKey|clientX|clientY|" +
"ctrlKey|charCode|keyCode|metaKey|relatedTarget|screenX|screenY|shiftKey|initMouseEvent|" +
"initKeyboardEvent)";
private static final String XSS_HTML_TAG = "(src=\"javascript:)|(%3c/frame)|(%3cframe)|(%3c/iframe)|(%3ciframe)|(%3c/script)|(%3cscript)|(set-cookie)|(</frame)|(<frame)|(</iframe)|(<iframe)|(</script)|(<script)|(/%3e)|(%3c/)|(%3e)|(%3c)|(/>)|(</)|(%3c/body)|(%3cbody)|(</body)|(<body)|(%3C)|(%3E)+";
private static final String XSS_INJECTION = "(('\">)|(%27\"><script>)|(%27\">)|(\"><script>)|(\"<)|(%22%20)|(%22\\s)|('%22)|(%22\\+))\\w.*|(\\s|%20)" + EVENTS
+ ".*|(%3D)|(%7C)";
private static final String XSS_REGEX = XSS_HTML_TAG + "|" + XSS_INJECTION;
private static final String SQL_REGEX = "('.+--)|(--)|(\\|)|(%7C)";涉及到的过滤方法
public XssHttpServletRequestWrapper(HttpServletRequest request) {
super(request);
orgRequest = request;
}
/**
* 覆盖getParameter方法，将参数名和参数值都做xss过滤。
* 如果需要获得原始的值，则通过super.getParameterValues(name)来获取
* getParameterNames,getParameterValues和getParameterMap也可能需要覆盖
*/
@Override
public String getParameter(String name) {
String value = super.getParameter(xssEncode(name));
if (value != null) {
value = URLDecoder.decode(value.replace("+", "%2B"));
value = HTMLEncode(value);
value = xssEncode(value);
}
return value;
} /**
* 覆盖getHeader方法，将参数名和参数值都做xss过滤。 如果需要获得原始的值，则通过super.getHeaders(name)来获取
* getHeaderNames 也可能需要覆盖
*/
@Override
public String getHeader(String name) {
String value = super.getHeader(xssEncode(name));
if (value != null) {
value = URLDecoder.decode(value.replace("+", "%2B"));
value = HTMLEncode(value);
value = xssEncode(value);
}
return value;
}
/**
* 获取request的属性时，做xss过滤
*/
@Override
public Object getAttribute(String name) {
Object value = super.getAttribute(name);
if (null != value && value instanceof String) {
value = URLDecoder.decode(String.valueOf(value).replace("+", "%2B"));
value = HTMLEncode((String) value);
value = xssEncode((String) value);
}
return value;
}
/**
* 对一些特殊字符进行转义
*/
public static String HTMLEncode(String aText) {
aText = aText.replaceAll(XSS_REGEX, "");
aText = aText.replaceAll(SQL_REGEX, "");
final StringBuilder result = new StringBuilder();
final StringCharacterIterator iterator = new StringCharacterIterator(aText);
char character = iterator.current();
while (character != CharacterIterator.DONE) {
if (character == '<') {
result.append("<");
} else if (character == '>') {
result.append(">");
} else if (character == '&') {
result.append("&");
} else if (character == '\"') {
result.append(""");
} else if (character == '\'') {
result.append("'");
} else {
result.append(character);
}
character = iterator.next();
}
return result.toString();
}
public String escape(String s) {
StringBuilder sb = new StringBuilder(s.length() + 16);
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
switch (c) {
case '>':
sb.append('＞');// 全角大于号
break;
case '<':
sb.append('＜');// 全角小于号
break;
case '\'':
sb.append('‘');// 全角单引号
break;
case '\"':
sb.append('“');// 全角双引号
break;
case '\\':
sb.append('＼');// 全角斜线
break;
case '%':
sb.append('％'); // 全角冒号
break;
default:
sb.append(c);
break;
}
}
return sb.toString();
}
/**
* 将容易引起xss漏洞的半角字符直接替换成全角字符
*
* @param s
* @return
*/
public String xssEncode(String s) {
if (s == null || s.isEmpty()) {
return s;
}
String result = stripXSS(s);
if (null != result) {
result = escape(result);
}
return result;
}
private String stripXSS(String value) {
if (value != null) {
// NOTE: It's highly recommended to use the ESAPI library and uncomment the following line to
// avoid encoded attacks.
// value = ESAPI.encoder().canonicalize(value);
// Avoid null characters
value = value.replaceAll("", "");
// Avoid anything between script tags
Pattern scriptPattern = Pattern.compile("<script>(.*?)</script>", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid anything in a src='...' type of expression
scriptPattern = Pattern.compile("src[\r\n]*=[\r\n]*\\\'(.*?)\\\'", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
scriptPattern = Pattern.compile("src[\r\n]*=[\r\n]*\\\"(.*?)\\\"", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
// Remove any lonesome </script> tag
scriptPattern = Pattern.compile("</script>", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Remove any lonesome <script ...> tag
scriptPattern = Pattern.compile("<script(.*?)>", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid eval(...) expressions
scriptPattern = Pattern.compile("eval\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid expression(...) expressions
scriptPattern = Pattern.compile("expression\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid javascript:... expressions
scriptPattern = Pattern.compile("javascript:", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid vbscript:... expressions
scriptPattern = Pattern.compile("vbscript:", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid onload= expressions
scriptPattern = Pattern.compile("onload(.*?)=", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
scriptPattern = Pattern.compile("<iframe>(.*?)</iframe>", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
scriptPattern = Pattern.compile("</iframe>", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Remove any lonesome <script ...> tag
scriptPattern = Pattern.compile("<iframe(.*?)>", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
}
return value;
}
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