<!-- xss过滤器 -->
<filter>
<filter-name>XssFilter</filter-name>
<filter-class>com.zyyt.sipctask.common.filter.XssFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>XssFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
package com.zyyt.sipctask.common.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
public class XssFilter implements Filter {
FilterConfig filterConfig = null;
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}
public void destroy() {
this.filterConfig = null;
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
chain.doFilter(new XssHttpServletRequestWrapperNew(
(HttpServletRequest) request), response);
}
}
XssHttpServletRequestWrapperNew.java
package com.zyyt.sipctask.common.filter;
import java.text.CharacterIterator;
import java.text.StringCharacterIterator;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
public class XssHttpServletRequestWrapperNew extends HttpServletRequestWrapper {
HttpServletRequest orgRequest = null;
public XssHttpServletRequestWrapperNew(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 = xssEncode(value);
value = HTMLEncode(value);
}
return value;
}
/**
* spring是使用的getParameterValues方法
*/
@Override
public String[] getParameterValues(String name) {
String[] value = super.getParameterValues(name);
if (value == null) {
return null;
}
for (int i = 0;i < value.length;i++) {
value[i] = xssEncode(value[i]);
value[i] = HTMLEncode(value[i]);
}
return value;
}
/**
* 对一些特殊字符进行转义
*
*
*/
public static String HTMLEncode(String aText) {
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 {
// the char is not a special one
// add it to the result as is
result.append(character);
}
character = iterator.next();
}
return result.toString();
}
/**
* 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 = xssEncode(value);
}
return value;
}
/**
* 将容易引起xss漏洞的半角字符直接替换成全角字符
* 目前xssProject对注入代码要求是必须开始标签和结束标签(如<script></script>)正确匹配才能解析，否则报错；因此只能替换调xssProject换为自定义实现
*
* @param s
* @return
*/
private static String xssEncode(String s) {
//
// if (s == null || s.isEmpty()) {
// return s;
// }
//
// StringReader reader = new StringReader(s);
// StringWriter writer = new StringWriter();
// try {
// HTMLParser.process(reader, writer, new XSSFilter(), true);
//
// String result = writer.toString();
//
// System.out.println("xssEncode-------------------------" + s + " = "
// + result);
//
// return result;
// } catch (NullPointerException e) {
// return s;
// } catch (Exception ex) {
// ex.printStackTrace();
// }
//
// return null;
if (s == null || s.isEmpty()) {
return s;
}
String result = stripXSS(s);
if (null != result) {
result = escape(result);
}
return result;
}
public static 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();
}
private static 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("");
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;
}
/**
* 获取最原始的request
*
* @return
*/
public HttpServletRequest getOrgRequest() {
return orgRequest;
}
/**
* 获取最原始的request的静态方法
*
* @return
*/
public static HttpServletRequest getOrgRequest(HttpServletRequest req) {
if (req instanceof XssHttpServletRequestWrapperNew) {
return ((XssHttpServletRequestWrapperNew) req).getOrgRequest();
}
return req;
}
}