Spring防止Xss配置

web.xml配置

<!-- 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>

XssFilter.java

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;
	}

}