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SpringBoot通過Filter實(shí)現(xiàn)整個(gè)項(xiàng)目接口的SQL注入攔截詳解

更新時(shí)間：2023年12月04日 09:13:36 作者：w7h1te

這篇文章主要介紹了SpringBoot通過Filter實(shí)現(xiàn)整個(gè)項(xiàng)目接口的SQL注入攔截詳解,SQL注入是比較常見的網(wǎng)絡(luò)攻擊方式之一,在客戶端在向服務(wù)器發(fā)送請(qǐng)求的時(shí)候,sql命令通過表單提交或者url字符串拼接傳遞到后臺(tái)持久層,最終達(dá)到欺騙服務(wù)器執(zhí)行惡意的SQL命令,需要的朋友可以參考下

前言

業(yè)務(wù)背景：一般情況下，我們的項(xiàng)目是需要做SQL注入、XSS攔截等安全性問題，本來是打算在網(wǎng)關(guān)層面做全局過濾器或者自定義過濾器，但是苦于遇到依賴問題等實(shí)在短期內(nèi)無法解決，于是便在其下一層針對(duì)某個(gè)項(xiàng)目做SQL注入攔截。

一、直接上源碼

1.啟動(dòng)類路徑下，直接建一個(gè)filter包，

過濾器SqlInjectFilter

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.bc.base.log.BaseLog;
import com.bc.digitalmanage.entity.common.ResultMsg;
import org.apache.commons.lang3.StringUtils;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpStatus;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.*;
/**
 * @author w7h1te-ywq
 * @version 9月...
 * @date 2022/9/13 16:00
 */
@WebFilter(urlPatterns = "/",filterName = "SqlInjectionFilter")
@Configuration
public class SqlInjectionFilter implements Filter {
    private static BaseLog log = BaseLog.getInstance(SqlInjectionFilter.class.getName());
    private static final Set<String> ALLOWED_PATHS = Collections.unmodifiableSet(new HashSet<>(
            Arrays.asList("")));
    private static final String SQL_REG_EXP = ".*(\\b(select|insert|into|update|delete|from|where|trancate" +
            "|drop|execute|grant|use|union)\\b).*";
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        CustomRequestWrapper requestWrapper = new CustomRequestWrapper(request);
        Map<String, Object> parameterMap = new HashMap<>();
        String path = request.getRequestURI().substring(request.getContextPath().length()).replaceAll("[/]+$", "");
        boolean allowedPath = ALLOWED_PATHS.contains(path);
        if (!allowedPath) {
            parameterMap = getParameterMap(parameterMap, request, requestWrapper);
            // 正則校驗(yàn)是否有SQL關(guān)鍵字
            for (Object obj : parameterMap.entrySet()) {
                Map.Entry entry = (Map.Entry) obj;
                Object value = entry.getValue();
                if (value != null) {
                    boolean isValid = isSqlInject(value.toString(), servletResponse);
                    if (!isValid) {
                        return;
                    }
                }
            }
        }
        filterChain.doFilter(requestWrapper, servletResponse);
    }
    private Map<String, Object> getParameterMap(Map<String, Object> paramMap, HttpServletRequest request, CustomRequestWrapper requestWrapper) {
        // 1.POST請(qǐng)求獲取參數(shù)
        if ("POST".equals(request.getMethod().toUpperCase())) {
            String body = requestWrapper.getBody();
            if(StringUtils.isNotEmpty(body)){
                boolean jsonType = getJSONType(body);
                if(jsonType==true){
                    paramMap = JSONObject.parseObject(body, HashMap.class);
                }else {
                    String[] split = body.split("&");
                    for (int i = 0; i < split.length; i++) {
                        String[] split1;
                        split1 = split[i].split("=");
                        paramMap.put(split1[0],split1[1]);
                        split1 = null;
                    }
                }
            }else {
                Map<String, String[]> parameterMap = requestWrapper.getParameterMap();
                if (parameterMap != null && parameterMap.size() > 0) {
                    Set<Map.Entry<String, String[]>> entries = parameterMap.entrySet();
                    for (Map.Entry<String, String[]> next : entries) {
                        paramMap.put(next.getKey(), next.getValue()[0]);
                    }
                }
            }
        } else {
            Map<String, String[]> parameterMap = requestWrapper.getParameterMap();
            //普通的GET請(qǐng)求
            if (parameterMap != null && parameterMap.size() > 0) {
                Set<Map.Entry<String, String[]>> entries = parameterMap.entrySet();
                for (Map.Entry<String, String[]> next : entries) {
                    paramMap.put(next.getKey(), next.getValue()[0]);
                }
            } else {
                //GET請(qǐng)求,參數(shù)在URL路徑型式,比如server/{var1}/{var2}
                String afterDecodeUrl = null;
                try {
                    //編碼過URL需解碼解碼還原字符
                    afterDecodeUrl = URLDecoder.decode(request.getRequestURI(), "UTF-8");
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
                paramMap.put("pathVar", afterDecodeUrl);
            }
        }
        return paramMap;
    }
    private boolean isSqlInject(String value, ServletResponse servletResponse) throws IOException {
        ResultMsg<Object> resultMsg = new ResultMsg<>();
        if (null != value && value.toLowerCase().matches(SQL_REG_EXP)) {
            log.info(" SqlInjectionFilter isSqlInject ：入?yún)⒅杏蟹欠ㄗ址? " + value);
            HttpServletResponse response = (HttpServletResponse) servletResponse;
//            Map<String, String> responseMap = new HashMap<>();
            // 匹配到非法字符,立即返回
//            responseMap.put("code", "999");
//            responseMap.put("message","入?yún)⒅杏蟹欠ㄗ址?);
            resultMsg.setResultMsg("輸入數(shù)據(jù)中存在非法字符！");
            resultMsg.setSuccess(false);
            resultMsg.setResultCode("999");
            resultMsg.setData("入?yún)⒅杏蟹欠ㄗ址猄QL注入攔截?。?！");
            response.setContentType("application/json;charset=UTF-8");
            response.setStatus(HttpStatus.OK.value());
            response.getWriter().write(JSON.toJSONString(resultMsg));
            response.getWriter().flush();
            response.getWriter().close();
            return false;
        }
        return true;
    }
    private boolean getJSONType(String str){
        boolean result = false;
        if (StringUtils.isNotBlank(str)) {
            str = str.trim();
            if (str.startsWith("{") && str.endsWith("}")) {
                result = true;
            } else if (str.startsWith("[") && str.endsWith("]")) {
                result = true;
            }
        }
        return result;
    }
    @Override
    public void destroy() {
    }
}

設(shè)置請(qǐng)求裝飾類CustomRequestWrapper

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.Enumeration;
import java.util.Map;
/**
 * @author w7h1te-ywq
 * @version 9月...
 * @date 2022/9/13 16:01
 */
public class CustomRequestWrapper extends HttpServletRequestWrapper {
    private final String body;
    public CustomRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        StringBuilder sb = new StringBuilder();
        BufferedReader bufferedReader = null;
        try {
            InputStream inputStream = request.getInputStream();
            if (inputStream != null) {
                bufferedReader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8));
                char[] charBuffer = new char[512];
                int bytesRead = -1;
                while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
                    sb.append(charBuffer, 0, bytesRead);
                }
            } else {
                sb.append("");
            }
        } catch (IOException e) {
            e.printStackTrace();
            throw e;
        } finally {
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    throw e;
                }
            }
        }
        body = sb.toString();
    }
    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream bais = new ByteArrayInputStream(body.getBytes("UTF-8"));
        return new ServletInputStream() {
            @Override
            public boolean isFinished() {
                return false;
            }
            @Override
            public boolean isReady() {
                return false;
            }
            @Override
            public void setReadListener(ReadListener readListener) {
            }
            @Override
            public int read() {
                return bais.read();
            }
        };
    }
    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(this.getInputStream(), StandardCharsets.UTF_8));
    }
    public String getBody() {
        return this.body;
    }
    @Override
    public String getParameter(String name) {
        return super.getParameter(name);
    }
    @Override
    public Map<String, String[]> getParameterMap() {
        return super.getParameterMap();
    }
    @Override
    public Enumeration<String> getParameterNames() {
        return super.getParameterNames();
    }
    @Override
    public String[] getParameterValues(String name) {
        return super.getParameterValues(name);
    }
}

以bean注解來詮釋次配置文件相關(guān)代碼FilterConfiguration

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.Enumeration;
import java.util.Map;
/**
 * @author w7h1te-ywq
 * @version 9月...
 * @date 2022/9/13 16:01
 */
public class CustomRequestWrapper extends HttpServletRequestWrapper {
    private final String body;
    public CustomRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        StringBuilder sb = new StringBuilder();
        BufferedReader bufferedReader = null;
        try {
            InputStream inputStream = request.getInputStream();
            if (inputStream != null) {
                bufferedReader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8));
                char[] charBuffer = new char[512];
                int bytesRead = -1;
                while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
                    sb.append(charBuffer, 0, bytesRead);
                }
            } else {
                sb.append("");
            }
        } catch (IOException e) {
            e.printStackTrace();
            throw e;
        } finally {
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    throw e;
                }
            }
        }
        body = sb.toString();
    }
    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream bais = new ByteArrayInputStream(body.getBytes("UTF-8"));
        return new ServletInputStream() {
            @Override
            public boolean isFinished() {
                return false;
            }
            @Override
            public boolean isReady() {
                return false;
            }
            @Override
            public void setReadListener(ReadListener readListener) {
            }
            @Override
            public int read() {
                return bais.read();
            }
        };
    }
    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(this.getInputStream(), StandardCharsets.UTF_8));
    }
    public String getBody() {
        return this.body;
    }
    @Override
    public String getParameter(String name) {
        return super.getParameter(name);
    }
    @Override
    public Map<String, String[]> getParameterMap() {
        return super.getParameterMap();
    }
    @Override
    public Enumeration<String> getParameterNames() {
        return super.getParameterNames();
    }
    @Override
    public String[] getParameterValues(String name) {
        return super.getParameterValues(name);
    }
}

二、在springboot啟動(dòng)類上添加注解聲明過濾器

代碼：

@ServletComponentScan(basePackages = “com.bc.***.filter”)

三、什么是sql注入

SQL注入是比較常見的網(wǎng)絡(luò)攻擊方式之一，在客戶端在向服務(wù)器發(fā)送請(qǐng)求的時(shí)候，sql命令通過表單提交或者url字符串拼接傳遞到后臺(tái)持久層，最終達(dá)到欺騙服務(wù)器執(zhí)行惡意的SQL命令；

它不是利用操作系統(tǒng)的BUG來實(shí)現(xiàn)攻擊，而是針對(duì)程序員編程時(shí)的疏忽，通過SQL語句，實(shí)現(xiàn)無帳號(hào)登錄，甚至篡改數(shù)據(jù)庫。

sql注入可能產(chǎn)生的影響

惡意用戶可以未經(jīng)授權(quán)訪問您的應(yīng)用程序并竊取數(shù)據(jù)。

他們可以更改，刪除數(shù)據(jù)庫中的數(shù)據(jù)并關(guān)閉您的應(yīng)用程序。

黑客還可以通過執(zhí)行數(shù)據(jù)庫特定的系統(tǒng)命令來控制運(yùn)行數(shù)據(jù)庫服務(wù)器的系統(tǒng)。

到此這篇關(guān)于SpringBoot通過Filter實(shí)現(xiàn)整個(gè)項(xiàng)目接口的SQL注入攔截詳解的文章就介紹到這了,更多相關(guān)SpringBoot的SQL注入攔截內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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