SpringBoot 安全漏洞之SQL注入和XSS攻击

系统管理员 2023-10-10 13:27 61阅读 0赞

## 1、自定义HttpServletRequestWrapper类，实现SQL和XSS 过滤 ##

package com.zzg.sql.filter;
    
    import java.io.BufferedReader;
    import java.io.ByteArrayInputStream;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.util.Enumeration;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.Set;
    import java.util.Vector;
    import java.util.regex.Pattern;
    import javax.servlet.ReadListener;
    import javax.servlet.ServletInputStream;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletRequestWrapper;
    import org.springframework.util.StreamUtils;
    
    public class XssAndSqlHttpServletRequestWrapper extends HttpServletRequestWrapper {
    	 HttpServletRequest orgRequest = null;
    	    private Map<String, String[]> parameterMap;
    	    private final byte[] body; //用于保存读取body中数据
    
    	    public XssAndSqlHttpServletRequestWrapper(HttpServletRequest request) throws IOException{
    	        super(request);
    	        orgRequest = request;
    	        parameterMap = request.getParameterMap();
    	        body = StreamUtils.copyToByteArray(request.getInputStream());
    	    }
    
    	    // 重写几个HttpServletRequestWrapper中的方法
    	    /**
    	     * 获取所有参数名
    	     *
    	     * @return 返回所有参数名
    	     */
    	    @Override
    	    public Enumeration<String> getParameterNames() {
    	        Vector<String> vector = new Vector<String>(parameterMap.keySet());
    	        return vector.elements();
    	    }
    
    	    /**
    	     * 覆盖getParameter方法，将参数名和参数值都做xss & sql过滤。<br/>
    	     * 如果需要获得原始的值，则通过super.getParameterValues(name)来获取<br/>
    	     * getParameterNames,getParameterValues和getParameterMap也可能需要覆盖
    	     */
    	    @Override
    	    public String getParameter(String name) {
    	        String[] results = parameterMap.get(name);
    	        if (results == null || results.length <= 0)
    	            return null;
    	        else {
    	            String value = results[0];
    	            if (value != null) {
    	                value = xssEncode(value);
    	            }
    	            return value;
    	        }
    	    }
    
    	    /**
    	     * 获取指定参数名的所有值的数组，如：checkbox的所有数据 接收数组变量 ，如checkobx类型
    	     */
    	    @Override
    	    public String[] getParameterValues(String name) {
    	        String[] results = parameterMap.get(name);
    	        if (results == null || results.length <= 0)
    	            return null;
    	        else {
    	            int length = results.length;
    	            for (int i = 0; i < length; i++) {
    	                results[i] = xssEncode(results[i]);
    	            }
    	            return results;
    	        }
    	    }
    
    	    /**
    	     * 覆盖getHeader方法，将参数名和参数值都做xss & sql过滤。<br/>
    	     * 如果需要获得原始的值，则通过super.getHeaders(name)来获取<br/>
    	     * 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 & sql漏洞的半角字符直接替换成全角字符
    	     * 
    	     * @param s
    	     * @return
    	     */
    	    private static String xssEncode(String s) {
    	        if (s == null || s.isEmpty()) {
    	            return s;
    	        } else {
    	            s = stripXSSAndSql(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("＞");// 转义大于号
    	                break;
    	            case '<':
    	                sb.append("＜");// 转义小于号
    	                break;
    	            // case '\'':
    	            // sb.append("＇");// 转义单引号
    	            // break;
    	            // case '\"':
    	            // sb.append("＂");// 转义双引号
    	            // break;
    	            case '&':
    	                sb.append("＆");// 转义&
    	                break;
    	            case '#':
    	                sb.append("＃");// 转义#
    	                break;
    	            default:
    	                sb.append(c);
    	                break;
    	            }
    	        }
    	        return sb.toString();
    	    }
    
    	    /**
    	     * 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 XssAndSqlHttpServletRequestWrapper) {
    	            return ((XssAndSqlHttpServletRequestWrapper) req).getOrgRequest();
    	        }
    
    	        return req;
    	    }
    
    	    /**
    	     * 
    	     * 防止xss跨脚本攻击（替换，根据实际情况调整）
    	     */
    
    	    public static String stripXSSAndSql(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(
    	                    "<[\r\n| | ]*script[\r\n| | ]*>(.*?)</[\r\n| | ]*script[\r\n| | ]*>", Pattern.CASE_INSENSITIVE);
    	            value = scriptPattern.matcher(value).replaceAll("");
    	            // Avoid anything in a
    	            // src="http://www.yihaomen.com/article/java/..." type of
    	            // e-xpression
    	            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("</[\r\n| | ]*script[\r\n| | ]*>", Pattern.CASE_INSENSITIVE);
    	            value = scriptPattern.matcher(value).replaceAll("");
    	            // Remove any lonesome <script ...> tag
    	            scriptPattern = Pattern.compile("<[\r\n| | ]*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 e-xpression(...) expressions
    	            scriptPattern = Pattern.compile("e-xpression\\((.*?)\\)",
    	                    Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
    	            value = scriptPattern.matcher(value).replaceAll("");
    	            // Avoid javascript:... expressions
    	            scriptPattern = Pattern.compile("javascript[\r\n| | ]*:[\r\n| | ]*", Pattern.CASE_INSENSITIVE);
    	            value = scriptPattern.matcher(value).replaceAll("");
    	            // Avoid vbscript:... expressions
    	            scriptPattern = Pattern.compile("vbscript[\r\n| | ]*:[\r\n| | ]*", 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 value;
    	    }
    
    	    public static boolean checkXSSAndSql(String value) {
    	        boolean flag = false;
    	        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(
    	                    "<[\r\n| | ]*script[\r\n| | ]*>(.*?)</[\r\n| | ]*script[\r\n| | ]*>", Pattern.CASE_INSENSITIVE);
    	            flag = scriptPattern.matcher(value).find();
    	            if (flag) {
    	                return flag;
    	            }
    	            // Avoid anything in a
    	            // src="http://www.yihaomen.com/article/java/..." type of
    	            // e-xpression
    	            scriptPattern = Pattern.compile("src[\r\n| | ]*=[\r\n| | ]*[\\\"|\\\'](.*?)[\\\"|\\\']",
    	                    Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
    	            flag = scriptPattern.matcher(value).find();
    	            if (flag) {
    	                return flag;
    	            }
    	            // Remove any lonesome </script> tag
    	            scriptPattern = Pattern.compile("</[\r\n| | ]*script[\r\n| | ]*>", Pattern.CASE_INSENSITIVE);
    	            flag = scriptPattern.matcher(value).find();
    	            if (flag) {
    	                return flag;
    	            }
    	            // Remove any lonesome <script ...> tag
    	            scriptPattern = Pattern.compile("<[\r\n| | ]*script(.*?)>",
    	                    Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
    	            flag = scriptPattern.matcher(value).find();
    	            if (flag) {
    	                return flag;
    	            }
    	            // Avoid eval(...) expressions
    	            scriptPattern = Pattern.compile("eval\\((.*?)\\)",
    	                    Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
    	            flag = scriptPattern.matcher(value).find();
    	            if (flag) {
    	                return flag;
    	            }
    	            // Avoid e-xpression(...) expressions
    	            scriptPattern = Pattern.compile("e-xpression\\((.*?)\\)",
    	                    Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
    	            flag = scriptPattern.matcher(value).find();
    	            if (flag) {
    	                return flag;
    	            }
    	            // Avoid javascript:... expressions
    	            scriptPattern = Pattern.compile("javascript[\r\n| | ]*:[\r\n| | ]*", Pattern.CASE_INSENSITIVE);
    	            flag = scriptPattern.matcher(value).find();
    	            if (flag) {
    	                return flag;
    	            }
    	            // Avoid vbscript:... expressions
    	            scriptPattern = Pattern.compile("vbscript[\r\n| | ]*:[\r\n| | ]*", Pattern.CASE_INSENSITIVE);
    	            flag = scriptPattern.matcher(value).find();
    	            if (flag) {
    	                return flag;
    	            }
    	            // Avoid onload= expressions
    	            scriptPattern = Pattern.compile("onload(.*?)=",
    	                    Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
    	            flag = scriptPattern.matcher(value).find();
    	            if (flag) {
    	                return flag;
    	            }
    	        }
    	        return flag;
    	    }
    
    	    public final boolean checkParameter() {
    	        Map<String, String[]> submitParams = new HashMap(parameterMap);
    	        Set<String> submitNames = submitParams.keySet();
    	        for (String submitName : submitNames) {
    	            Object submitValues = submitParams.get(submitName);
    	            if ((submitValues instanceof String)) {
    	                if (checkXSSAndSql((String) submitValues)) {
    	                    return true;
    	                }
    	            } else if ((submitValues instanceof String[])) {
    	                for (String submitValue : (String[])submitValues){
    	                    if (checkXSSAndSql(submitValue)) {
    	                        return true;
    	                    }
    	                }
    	            }
    	        }
    	        return false;
    	    }
    	    
    	    @Override    
    	    public BufferedReader getReader() throws IOException {    
    	        return new BufferedReader(new InputStreamReader(getInputStream()));    
    	    }    
    	    
    	    @Override    
    	    public ServletInputStream getInputStream() throws IOException {    
    	        final ByteArrayInputStream bais = new ByteArrayInputStream(body);    
    	        return new ServletInputStream() {    
    	    
    	            @Override    
    	            public int read() throws IOException {    
    	                return bais.read();    
    	            }  
    
    	            @Override  
    	            public boolean isFinished() {  
    	                // TODO Auto-generated method stub  
    	                return false;  
    	            }  
    
    	            @Override  
    	            public boolean isReady() {  
    	                // TODO Auto-generated method stub  
    	                return false;  
    	            }  
    
    	            @Override  
    	            public void setReadListener(ReadListener arg0) {  
    	                // TODO Auto-generated method stub  
    	                  
    	            }    
    	        };    
    	    }
    }

## 2、自定义Filter ##

package com.zzg.sql.filter;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.PrintWriter;
    
    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;
    
    import org.apache.commons.lang3.StringUtils;
    
    import com.alibaba.fastjson.JSON;
    
    public class XssAndSqlFilter implements Filter {
    
        @Override
        public void destroy() {
            // TODO Auto-generated method stub
    
        }
    
        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
                throws IOException, ServletException {
            String method = "GET";
            String param = "";
            XssAndSqlHttpServletRequestWrapper xssRequest = null;
            if (request instanceof HttpServletRequest) {
                method = ((HttpServletRequest) request).getMethod();
                xssRequest = new XssAndSqlHttpServletRequestWrapper((HttpServletRequest) request);
            }
            if ("POST".equalsIgnoreCase(method)) {
                param = this.getBodyString(xssRequest.getReader());
                if(StringUtils.isNotBlank(param)){
                    if(xssRequest.checkXSSAndSql(param)){
                        response.setCharacterEncoding("UTF-8");
                        response.setContentType("application/json;charset=UTF-8");
                        PrintWriter out = response.getWriter();
                        out.write(JSON.toJSONString("您所访问的页面请求中有违反安全规则元素存在，拒绝访问!"));
                        return;
                    }
                }
            }
            if (xssRequest.checkParameter()) {
                response.setCharacterEncoding("UTF-8");
                response.setContentType("application/json;charset=UTF-8");
                PrintWriter out = response.getWriter();
                out.write(JSON.toJSONString("您所访问的页面请求中有违反安全规则元素存在，拒绝访问!"));
                return;
            }
            chain.doFilter(xssRequest, response);
        }
    
        @Override
        public void init(FilterConfig arg0) throws ServletException {
            // TODO Auto-generated method stub
    
        }
    
        // 获取request请求body中参数
        public static String getBodyString(BufferedReader br) {
            String inputLine;
            String str = "";
            try {
                while ((inputLine = br.readLine()) != null) {
                    str += inputLine;
                }
                br.close();
            } catch (IOException e) {
                System.out.println("IOException: " + e);
            }
            return str;
    
        }
    
    }

## 3、注册过滤器XssAndSqlFilter ##

@Configuration
    public class FilterConfig {
        @Bean
        public FilterRegistrationBean xssFilterRegistration() {
            FilterRegistrationBean registration = new FilterRegistrationBean();
            registration.setDispatcherTypes(DispatcherType.REQUEST);
            registration.setFilter(new XssAndSqlFilter());
            registration.addUrlPatterns("/*");
            registration.setName("xssAndSqlFilter");
            registration.setOrder(Integer.MAX_VALUE);
            Map<String, String> initParameters = Maps.newHashMap();
            //-excludes用于配置不需要参数过滤的请求url;
            initParameters.put("excludes", "/swagger-ui.html/**,/webjars/**,/v2/**,/swagger-resources/**");
            //-isIncludeRichText默认为true，主要用于设置富文本内容是否需要过滤。
            initParameters.put("isIncludeRichText", "false");
            return registration;
        }
    
    
    }