SpringMVC防止XSS攻击

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XSS全称为跨站脚本攻击 , 具体见百度百科

最常见的是用Filter来预防 , 就是创建一个新的httpRequest类XsslHttpServletRequestWrapper，然后重写一些get方法（获取参数时对参数进行XSS判断预防）.

1 . 在web.xml中添加Filter

<filter>       <filter-name>XssFilter</filter-name>       <filter-class>com.xbz.filter.XssFilter</filter-class>    </filter>    <filter-mapping>       <filter-name>XssFilter</filter-name>       <url-pattern>/*</url-pattern>    </filter-mapping>

2 . 编写XssFilter类

package com.xbz.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 fc = null;public void destroy() {fc = null;}public void doFilter(ServletRequest req, ServletResponse resp,FilterChain fc) throws IOException, ServletException {fc.doFilter(new XssHttpServletRequestWrapper((HttpServletRequest)req), resp);}public void init(FilterConfig fc) throws ServletException {this.fc = fc;}}

3 . 编写XssHttpServletRequestWrapper类

package com.xbz.filter;import java.util.HashMap;import java.util.Map;import java.util.regex.Pattern;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {    public XssHttpServletRequestWrapper(HttpServletRequest request) {        super(request);    }    public String[] getParameterValues(String parameter) {        String[] values = super.getParameterValues(parameter);        if (values == null) {            return null;        }        int count = values.length;        String[] encodedValues = new String[count];        for (int i = 0; i < count; i++) {            encodedValues[i] = cleanXSS(values[i]);        }        return encodedValues;    }    public Map<String, String[]> getParameterMap() {        Map<String, String[]> map = super.getParameterMap();        Map<String, String[]> encodedMap = new HashMap<String, String[]>();        encodedMap.putAll(map);        for (Map.Entry<String, String[]> entry : encodedMap.entrySet()) {            String[] value = entry.getValue();            String[] encodedValues = new String[value.length];            for (int i = 0; i < value.length; i++) {                encodedValues[i] = cleanXSS(value[i]);            }            encodedMap.put(entry.getKey(), encodedValues);        }        return encodedMap;    }    public String getParameter(String parameter) {        String value = super.getParameter(parameter);        if (value == null) {            return null;        }        return cleanXSS(value);    }    public String getHeader(String name) {        String value = super.getHeader(name);        if (value == null)            return null;        return cleanXSS(value);    }    private String cleanXSS(String value) {        if (value != null) {            // 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="http://www.yihaomen.com/article/java/..." 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("");        }        return filter(value);    }    /**      * 过滤特殊字符      */    public static String filter(String value) {        if (value == null) {            return null;        }        StringBuffer result = new StringBuffer(value.length());        for (int i = 0; i < value.length(); ++i) {            switch (value.charAt(i)) {            case '<':                result.append("<");                break;            case '>':                result.append(">");                break;            case '"':                result.append("\"");                break;            case '\'':                result.append("'");                break;            case '%':                result.append("%");                break;            case ';':                result.append(";");                break;            case '(':                result.append("(");                break;            case ')':                result.append(")");                break;            case '&':                result.append("&");                break;            case '+':                result.append("+");                break;            default:                result.append(value.charAt(i));                break;            }        }        return result.toString();    }}

另外, SpringBoot的写法请参考另一篇文章SpringBoot防止XSS攻击

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