正儿八经

public abstract class ServletInputStream extends InputStream {
    protected ServletInputStream() {
    }

    public int readLine(byte[] b, int off, int len) throws IOException {
        if (len <= 0) {
            return 0;
        } else {
            int count = 0;

            int c;
            while((c = this.read()) != -1) {
                b[off++] = (byte)c;
                ++count;
                if (c == 10 || count == len) {
                    break;
                }
            }

            return count > 0 ? count : -1;
        }
    }

    public abstract boolean isFinished();

    public abstract boolean isReady();

    public abstract void setReadListener(ReadListener var1);
}

public abstract class InputStream implements Closeable {

    // MAX_SKIP_BUFFER_SIZE is used to determine the maximum buffer size to
    // use when skipping.
    private static final int MAX_SKIP_BUFFER_SIZE = 2048;

    /**
     * Reads the next byte of data from the input stream. The value byte is
     * returned as an <code>int</code> in the range <code>0</code> to
     * <code>255</code>. If no byte is available because the end of the stream
     * has been reached, the value <code>-1</code> is returned. This method
     * blocks until input data is available, the end of the stream is detected,
     * or an exception is thrown.
     *
     * <p> A subclass must provide an implementation of this method.
     *
     * @return     the next byte of data, or <code>-1</code> if the end of the
     *             stream is reached.
     * @exception  IOException  if an I/O error occurs.
     */
    public abstract int read() throws IOException;
    
    /**
     * Repositions this stream to the position at the time the
     * <code>mark</code> method was last called on this input stream.
     *
     * <p> The general contract of <code>reset</code> is:
     *
     * <ul>
     * <li> If the method <code>markSupported</code> returns
     * <code>true</code>, then:
     *
     *     <ul><li> If the method <code>mark</code> has not been called since
     *     the stream was created, or the number of bytes read from the stream
     *     since <code>mark</code> was last called is larger than the argument
     *     to <code>mark</code> at that last call, then an
     *     <code>IOException</code> might be thrown.
     *
     *     <li> If such an <code>IOException</code> is not thrown, then the
     *     stream is reset to a state such that all the bytes read since the
     *     most recent call to <code>mark</code> (or since the start of the
     *     file, if <code>mark</code> has not been called) will be resupplied
     *     to subsequent callers of the <code>read</code> method, followed by
     *     any bytes that otherwise would have been the next input data as of
     *     the time of the call to <code>reset</code>. </ul>
     *
     * <li> If the method <code>markSupported</code> returns
     * <code>false</code>, then:
     *
     *     <ul><li> The call to <code>reset</code> may throw an
     *     <code>IOException</code>.
     *
     *     <li> If an <code>IOException</code> is not thrown, then the stream
     *     is reset to a fixed state that depends on the particular type of the
     *     input stream and how it was created. The bytes that will be supplied
     *     to subsequent callers of the <code>read</code> method depend on the
     *     particular type of the input stream. </ul></ul>
     *
     * <p>The method <code>reset</code> for class <code>InputStream</code>
     * does nothing except throw an <code>IOException</code>.
     *
     * @exception  IOException  if this stream has not been marked or if the
     *               mark has been invalidated.
     * @see     java.io.InputStream#mark(int)
     * @see     java.io.IOException
     */
    public synchronized void reset() throws IOException {
        throw new IOException("mark/reset not supported");
    }

public
class ByteArrayInputStream extends InputStream {
    /**
     * The currently marked position in the stream.
     * ByteArrayInputStream objects are marked at position zero by
     * default when constructed.  They may be marked at another
     * position within the buffer by the <code>mark()</code> method.
     * The current buffer position is set to this point by the
     * <code>reset()</code> method.
     * <p>
     * If no mark has been set, then the value of mark is the offset
     * passed to the constructor (or 0 if the offset was not supplied).
     *
     * @since   JDK1.1
     */
    protected int mark = 0;
    
    /**
     * The index of the next character to read from the input stream buffer.
     * This value should always be nonnegative
     * and not larger than the value of <code>count</code>.
     * The next byte to be read from the input stream buffer
     * will be <code>buf[pos]</code>.
     */
    protected int pos;
    /**
     * Reads the next byte of data from this input stream. The value
     * byte is returned as an <code>int</code> in the range
     * <code>0</code> to <code>255</code>. If no byte is available
     * because the end of the stream has been reached, the value
     * <code>-1</code> is returned.
     * <p>
     * This <code>read</code> method
     * cannot block.
     *
     * @return  the next byte of data, or <code>-1</code> if the end of the
     *          stream has been reached.
     */
    public synchronized int read() {
        return (pos < count) ? (buf[pos++] & 0xff) : -1;
    }
    
     /**
     * Resets the buffer to the marked position.  The marked position
     * is 0 unless another position was marked or an offset was specified
     * in the constructor.
     */
    public synchronized void reset() {
        pos = mark;
    }

/**
 * @author Gamehu
 * @date 2019/5/9 18:32
 * @description sql注入问题，前置处理输入流，避免输入流获取一次以后失效导致系统异常
 */
public class xxxHttpServletRequestWrapper extends HttpServletRequestWrapper {
    private static final Logger LOGGER = LoggerFactory.getLogger(SqlInjectHttpServletRequestWrapper.class);
    /**
     * 存储请求输入流
     */
    private byte[] body;


    public SqlInjectHttpServletRequestWrapper(HttpServletRequest request) {
        super(request);
        try {
            body = inputStreamToByte(request.getInputStream());
        } catch (IOException e) {
            throw RiilExceptionUtils.bizException(e, BaseWebErrorCode.SecurityConstant.ERROR, BaseWebErrorMsg.SecurityConstant.ERROR_MSG);
        }
    }

    /**
     * 流转 字节数组
     *
     * @param is
     * @return
     * @throws IOException
     */
    private byte[] inputStreamToByte(InputStream is) throws IOException {
        ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int ch;
        while ((ch = is.read(buffer)) != -1) {
            byteStream.write(buffer, 0, ch);
        }
        byte[] data = byteStream.toByteArray();
        byteStream.close();
        return data;
    }

    @Override
    public BufferedReader getReader() {
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }

    /**
     * 重写方法用于多次获取流，防止读取用于校验过后，后面服务无法获取参数的情况
     *
     * @return
     */
    @Override
    public ServletInputStream getInputStream() {
        final ByteArrayInputStream bais = new ByteArrayInputStream(body);
        return new ServletInputStream() {

            @Override
            public boolean isFinished() {
                return false;
            }

            @Override
            public boolean isReady() {
                return false;
            }

            @Override
            public void setReadListener(ReadListener readListener) {
                LOGGER.info("setReadListener");
            }

            @Override
            public int read() {
                return bais.read();
            }
        };


    }

/**
 * @author Gamehu
 * @date 2018/12/20 15:18
 * @description  XSS、SQL注入校验
 */
@WebFilter(urlPatterns = "/*", filterName = "xxFilter")
public class xxFilter implements Filter {
   

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        ...
        //安全扫描问题（sql注入、xss）处理，对参数进行校验
        securityScanParamsValidate(filterChain, response, request);
    }
 

    /**
     * 安全扫描问题（sql注入、xss）处理，对参数进行校验
     *
     * @param filterChain
     * @param response
     * @param request
     * @throws IOException
     * @throws ServletException
     */
    private void securityScanParamsValidate(final FilterChain filterChain, final HttpServletResponse response, final HttpServletRequest request) throws IOException, ServletException {
        final  String paramsAndValues = SecurityScanUtil.extractPostRequestBody(request);
        if (StringUtils.isEmpty(paramsAndValues)) {
            filterChain.doFilter(request, response);
        } else {
            //根据参数是否能转换为json，执行不同的校验
            parseParamAndValidate(filterChain, response, request, paramsAndValues);
        }

    }

    private void parseParamAndValidate(final FilterChain filterChain, final HttpServletResponse response, final HttpServletRequest request, final String paramsAndValues) throws IOException, ServletException {
        try {
            final JSONObject paramsObj = JSONObject.parseObject(paramsAndValues);
            if (paramsObj.size() == 0) {
                filterChain.doFilter(request, response);
            } else {
                //对参数进行拆分校验，只校验每个参数值
                jsonParamValidate(filterChain, response, request, paramsAndValues);
            }

        } catch (JSONException ex) {
            LOGGER.error("isJSONValid，不是有效的JSON字符串,{}", ex.getMessage());
            //参数不是合法地json格式则进行整句校验（不进行任何拆分）
            notJsonParamValidate(filterChain, response, request, paramsAndValues);
        }
    }

    /**
     * 非json格式参数安全问题校验
     *
     * @param filterChain
     * @param response
     * @param request
     * @param paramsAndValues
     * @throws IOException
     * @throws ServletException
     */
    private void notJsonParamValidate(final FilterChain filterChain, final HttpServletResponse response, final HttpServletRequest request, final String paramsAndValues) throws IOException, ServletException {
        final String uri = request.getRequestURI();
        // sql注入校验
        if (SecurityScanUtil.execSqlInjectValidate(uri, NO_KEY, paramsAndValues)) {
            response.sendRedirect(SQL_INJECT_ERROR);
        } else if (XssUtil.xssMatcher(uri, NO_KEY, paramsAndValues)) {
            //xss校验
            response.sendRedirect(XSS_ERROR);
        } else {
            filterChain.doFilter(request, response);
        }
    }

    /**
     * json格式参数安全问题校验（sql注入、xss）
     *
     * @param filterChain
     * @param response
     * @param request
     * @param paramsAndValues
     * @throws IOException
     * @throws ServletException
     */
    private void jsonParamValidate(final FilterChain filterChain, final HttpServletResponse response, final HttpServletRequest request, final String paramsAndValues) throws IOException, ServletException {
        //防sql注入校验
        if (SecurityScanUtil.sqlInjectValidate(request.getRequestURI(), paramsAndValues)) {
            response.sendRedirect(SQL_INJECT_ERROR);
        } else if (SecurityScanUtil.xssValidate(request.getRequestURI(), paramsAndValues)) {
            //xss校验
            response.sendRedirect(XSS_ERROR);
        } else {
            filterChain.doFilter(request, response);
        }
    }

    @Override
    public void destroy() {
        LOGGER.info("destroy");
    }


}

/**
 * 
 * @author Gamehu
 * @description  Xss和Sql注入检查 工具类 
 * @date 2019/5/10 9:54
 */
public class SecurityScanUtil {
    private static final Logger LOGGER = LoggerFactory.getLogger(SecurityScanUtil.class);
    private static final String GRAPHQL = "graphql";

    private SecurityScanUtil() {
    }

    /**
     * 单个参数的sql注入校验
     *
     * @param paramName
     * @param value
     * @return
     */
    public static String sqlInjectionValidate(final HttpServletRequest request, final String paramName, final String value) {
        if (StringUtils.isEmpty(value)) {
            return null;
        }
        /*
         * 防sql注入，如果存在抛出校验异常
         */
        if (SqlInjectUtil.haveSqlInject(request.getRequestURI(), paramName, value)) {
            return "sqlError";
        }

        return value;
    }


    /**
     * 读取输入流中参数
     *
     * @param request
     * @return
     */

    public static String extractPostRequestBody(final HttpServletRequest request) {

        final Scanner s;
        try {
            s = new Scanner(request.getInputStream(), "UTF-8").useDelimiter("\\A");
        } catch (IOException e) {
            throw RiilExceptionUtils.bizException(e, BaseWebErrorCode.SecurityConstant.INPUTSTREAM_ERROR, BaseWebErrorMsg.SecurityConstant.INPUTSTREAM_ERROR_MSG);
        }
        return s.hasNext() ? s.next() : "";

    }


    /**
     * 效验sql注入问题
     * <h3>SQL注入的几种方式：</h3>
     * <pre>
     * 1) 使用 ' or 语句，将查询条件扩大，实现破坏性查询（操作）
     * 2) 使用 ; 将SQL分成两部分，在后面一部分实现破坏性操作
     * 3) 使用注释，将后面的条件取消掉，将查询条件扩大，注意MySQL有三种注释的方法，都需要处理
     *
     * 为了简化处理，这里只考虑字符串类型参数注入情况（整型等其它类型在应用内部类型转换会失败，所以基本可以忽略）
     * </pre>
     *
     * @return
     * @throws IOException
     */
    public static boolean sqlInjectValidate(final String uri, final String paramsAndValues) {
        //获取参数列表以及参数值
        final JSONObject paramsObj = JSONObject.parseObject(paramsAndValues);
        final Set<String> keys = paramsObj.keySet();
        return keys.stream().anyMatch(key -> haveSqlInjectCondition(uri, paramsObj, key));
    }
 
    /**
     * 判断是否存在sql注入的表达式
     *
     * @param uri
     * @param paramsObj
     * @param key
     * @return
     */
    private static Boolean haveSqlInjectCondition(final String uri, final JSONObject paramsObj, final String key) {
        //graphql 不进行校验
        if (key.equalsIgnoreCase(GRAPHQL)) {
            return false;
        }
        final String value = convertParamToString(paramsObj, key);
        return SqlInjectUtil.haveSqlInject(uri, key, value);
    }

    /**
     * 效验XSS问题
     *
     * @param uri
     * @param paramsAndValues
     * @return
     */
    public static boolean xssValidate(final String uri, final String paramsAndValues) {
        //获取参数列表以及参数值
        final JSONObject paramsObj = JSONObject.parseObject(paramsAndValues);
        final Set<String> keys = paramsObj.keySet();
        return keys.stream().anyMatch(key -> haveXssCondition(uri, paramsObj, key));
    }

    /**
     * 判断是否存在xss的表达式
     *
     * @param uri
     * @param paramsObj
     * @param key
     * @return
     */
    private static boolean haveXssCondition(final String uri, final JSONObject paramsObj, final String key) {
        final String value = convertParamToString(paramsObj, key);
        //判断是否存在xss攻击问题
        return XssUtil.haveXss(value, key, uri);
    }

    /**
     * 处理参数为字符串
     *
     * @param paramsObj
     * @param key
     * @return
     */
    private static String convertParamToString(final JSONObject paramsObj, final String key) {
        final Object obj = paramsObj.get(key);

        String value = null;

        if (obj instanceof JSONObject) {
            value = ((JSONObject) obj).toJSONString();
        }

        if (obj instanceof JSONArray) {
            value = ((JSONArray) obj).toJSONString();
        }

        if (obj instanceof String) {
            value = (String) obj;
        }
        return value;
    }
 
}

/**
 * @author Gamehu
 * @date 2019/9/26 12:12
 * @description XSS校验的工具类
 */
public class XssUtil {
    private static final Logger LOGGER = LoggerFactory.getLogger(XssUtil.class);
    private static final String GRAPHQL = "graphql";
    private static Pattern[] patterns = new Pattern[]{
            // Script fragments
            Pattern.compile("<script>(.*?)</script>", Pattern.CASE_INSENSITIVE),
            // src='...'
            Pattern.compile("src[\r\n]*=[\r\n]*\\\'(.*?)\\\'", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL),
            Pattern.compile("src[\r\n]*=[\r\n]*\\\"(.*?)\\\"", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL),
            // lonely script tags
            Pattern.compile("</script>", Pattern.CASE_INSENSITIVE),
            Pattern.compile("<script(.*?)>", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL),
            // eval(...)
            Pattern.compile("eval\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL),
            // expression(...)
            Pattern.compile("expression\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL),
            // javascript:...
            Pattern.compile("javascript:", Pattern.CASE_INSENSITIVE),
            // vbscript:...
            Pattern.compile("vbscript:", Pattern.CASE_INSENSITIVE),
            // onload(...)=...
            Pattern.compile("onload(.*?)=", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL)
    };


    /**
     * 判断是否存在xss攻击
     *
     * @param value
     * @param key
     * @param uri
     * @return true表示存在，false表示不存在
     */
    public static Boolean haveXss(final String value, final String key, final String uri) {
        if (key.equalsIgnoreCase(GRAPHQL)) {
            return false;
        }
        return xssMatcher(value, key, uri);
    }

    public static boolean xssMatcher(final String value, final String key, final String uri) {
        if (StringUtils.isNotBlank(value)) {
            Matcher matcher;
            for (Pattern pattern : patterns) {
                matcher = pattern.matcher(value);
                // 匹配
                if (matcher.find()) {
                    LOGGER.error("存在xss风险,URI：{}，参数：{},参数值：{}", uri, key, value);
                    return true;
                }
            }

        }
        return false;
    }
    
}

/**
 * @author Gamehu
 * @date 2019/9/26 12:12
 * @description SQL注入校验的工具类
 */
public class SqlInjectUtil {
    /**
     * SQL语法检查正则：只检查一个关键字可能存在误判情况，这里要求必须符合两个关键字（有先后顺序）才算匹配
     * 第一组关键字
     */
    final static String sqlInjectGroup = "select|update|and|or|delete|insert|trancate|char|into|substr|ascii|declare|exec|count|master|drop|execute";

    /**
     * 构造SQL语法检查正则
     * (?i)忽略字母的大小写，\s.*空白+字符
     */
    final static Pattern sqlSyntaxPattern = Pattern.compile("(?i)(.*)\\b(" + sqlInjectGroup + " )\\b\\s.*", Pattern.CASE_INSENSITIVE);


    /**
     * 读取输入流中参数
     *
     * @param request
     * @return
     */

    public static String extractPostRequestBody(final HttpServletRequest request) {

        final Scanner s;
        try {
            s = new Scanner(request.getInputStream(), "UTF-8").useDelimiter("\\A");
        } catch (IOException e) {
            throw RiilExceptionUtils.bizException(e, BaseWebErrorCode.SecurityConstant.INPUTSTREAM_ERROR, BaseWebErrorMsg.SecurityConstant.INPUTSTREAM_ERROR_MSG);
        }
        return s.hasNext() ? s.next() : "";

    }

    /**
     * 执行SQL注入校验
     *
     * @param uri
     * @param key
     * @param oldValue
     * @return
     */
    public static boolean haveSqlInject(final String uri, final String key, final String oldValue) {
        if (StringUtils.isNotBlank(oldValue)) {
            //统一转为小写
            final String newValue = oldValue.toLowerCase();
            final String logStr = "存在sql注入风险,URL：{}，参数：{},参数值：{}";
            // 检查是否包含SQL注入敏感字符
            if (sqlSyntaxPattern.matcher(newValue).find()) {
                LOGGER.error(logStr, uri, key, newValue);
                return true;
            }
        }
        return false;
    }
    
}