xss防御相关更改策略，调整代码

framework/src/main/java/cn/lili/common/security/filter/XssAndSqlHttpServletRequestWrapper.java

@@ -1,46 +0,0 @@
-package cn.lili.common.security.filter;
-
-
-import org.apache.commons.lang3.StringUtils;
-import org.apache.commons.text.StringEscapeUtils;
-
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletRequestWrapper;
-
-/**
- * 防止Xss sql注入
- *
- * @author Chopper
- * @version v1.0
- * 2021-06-04 10:39
- */
-public class XssAndSqlHttpServletRequestWrapper extends HttpServletRequestWrapper {
-    private HttpServletRequest request;
-
-    public XssAndSqlHttpServletRequestWrapper(HttpServletRequest request) {
-        super(request);
-        this.request = request;
-    }
-
-    @Override
-    public String getParameter(String name) {
-        String value = request.getParameter(name);
-        if (!StringUtils.isEmpty(value)) {
-            value = StringEscapeUtils.escapeHtml4(value);
-        }
-        return value;
-    }
-
-    @Override
-    public String[] getParameterValues(String name) {
-        String[] parameterValues = super.getParameterValues(name);
-        if (parameterValues == null) {
-            return null;
-        }
-        for (int i = 0; i < parameterValues.length; i++) {
-            String value = parameterValues[i];
-            parameterValues[i] = StringEscapeUtils.escapeHtml4(value);
-        }
-        return parameterValues;
-    }
-}

framework/src/main/java/cn/lili/common/security/filter/XssFilter.java

@@ -1,11 +1,6 @@
 package cn.lili.common.security.filter;
 
 
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.module.SimpleModule;
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Primary;
-import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
 import org.springframework.stereotype.Component;
 
 import javax.servlet.*;
@@ -23,38 +18,22 @@ import java.io.IOException;
 @WebFilter
 @Component
 public class XssFilter implements Filter {
+    FilterConfig filterConfig = null;
+
     @Override
     public void init(FilterConfig filterConfig) throws ServletException {
+        this.filterConfig = filterConfig;
     }
 
     @Override
     public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
             throws IOException, ServletException {
-        HttpServletRequest req = (HttpServletRequest) request;
+        //对请求进行拦截,防xss处理
-        XssAndSqlHttpServletRequestWrapper xssRequestWrapper = new XssAndSqlHttpServletRequestWrapper(req);
+        chain.doFilter(new XssHttpServletRequestWrapper((HttpServletRequest) request), response);
-        chain.doFilter(xssRequestWrapper, response);
     }
 
     @Override
     public void destroy() {
-    }
+        this.filterConfig = null;
-
-    /**
-     * 过滤json类型的
-     *
-     * @param builder
-     * @return
-     */
-    @Bean
-    @Primary
-    public ObjectMapper xssObjectMapper(Jackson2ObjectMapperBuilder builder) {
-        //解析器
-        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
-        //注册xss解析器
-        SimpleModule xssModule = new SimpleModule("XssStringJsonSerializer");
-        xssModule.addSerializer(new XssStringJsonSerializer());
-        objectMapper.registerModule(xssModule);
-        //返回
-        return objectMapper;
     }
 }

framework/src/main/java/cn/lili/common/security/filter/XssHttpServletRequestWrapper.java

@@ -0,0 +1,136 @@
+package cn.lili.common.security.filter;
+
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletRequestWrapper;
+import java.util.regex.Pattern;
+
+/**
+ * 防止Xss sql注入
+ *
+ * @author Chopper
+ * @version v1.0
+ * 2021-06-04 10:39
+ */
+public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {
+    private HttpServletRequest request;
+
+    public XssHttpServletRequestWrapper(HttpServletRequest request) {
+        super(request);
+        this.request = request;
+    }
+
+    /**
+     * 对数组参数进行特殊字符过滤
+     */
+    @Override
+    public String[] getParameterValues(String name) {
+        String[] values = super.getParameterValues(name);
+        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;
+    }
+
+    /**
+     * 对参数中特殊字符进行过滤
+     */
+    @Override
+    public String getParameter(String name) {
+        String value = super.getParameter(name);
+        if (value == null) {
+            return null;
+        }
+        return cleanXSS(value);
+    }
+
+    /**
+     * 获取attribute,特殊字符过滤
+     */
+    @Override
+    public Object getAttribute(String name) {
+        Object value = super.getAttribute(name);
+        if (value != null && value instanceof String) {
+            cleanXSS((String) value);
+        }
+        return value;
+    }
+
+    /**
+     * 对请求头部进行特殊字符过滤
+     */
+    @Override
+    public String getHeader(String name) {
+        String value = super.getHeader(name);
+        if (value == null) {
+            return null;
+        }
+        return cleanXSS(value);
+    }
+
+    /**
+     * 转义字符,使用该方法存在一定的弊端
+     *
+     * @param value
+     * @return
+     */
+    private String cleanXSS2(String value) {
+        // 移除特殊标签
+        value = value.replaceAll("<", "&lt;").replaceAll(">", "&gt;");
+        value = value.replaceAll("\\(", "&#40;").replaceAll("\\)", "&#41;");
+        value = value.replaceAll("'", "&#39;");
+        value = value.replaceAll("eval\\((.*)\\)", "");
+        value = value.replaceAll("[\\\"\\\'][\\s]*javascript:(.*)[\\\"\\\']", "\"\"");
+        value = value.replaceAll("script", "");
+        return value;
+    }
+
+    private String cleanXSS(String value) {
+        if (value != null) {
+            //推荐使用ESAPI库来避免脚本攻击,value = ESAPI.encoder().canonicalize(value);
+            // 避免空字符串
+            value = value.replaceAll(" ", "");
+            // 避免script 标签
+            Pattern scriptPattern = Pattern.compile("<script>(.*?)</script>", Pattern.CASE_INSENSITIVE);
+            value = scriptPattern.matcher(value).replaceAll("");
+            // 避免src形式的表达式
+            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("");
+            // 删除单个的 </script> 标签
+            scriptPattern = Pattern.compile("</script>", Pattern.CASE_INSENSITIVE);
+            value = scriptPattern.matcher(value).replaceAll("");
+            // 删除单个的<script ...> 标签
+            scriptPattern = Pattern.compile("<script(.*?)>",
+                    Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
+            value = scriptPattern.matcher(value).replaceAll("");
+            // 避免 eval(...) 形式表达式
+            scriptPattern = Pattern.compile("eval\\((.*?)\\)",
+                    Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
+            value = scriptPattern.matcher(value).replaceAll("");
+            // 避免 e­xpression(...) 表达式
+            scriptPattern = Pattern.compile("e­xpression\\((.*?)\\)",
+                    Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
+            value = scriptPattern.matcher(value).replaceAll("");
+            // 避免 javascript: 表达式
+            scriptPattern = Pattern.compile("javascript:", Pattern.CASE_INSENSITIVE);
+            value = scriptPattern.matcher(value).replaceAll("");
+            // 避免 vbscript:表达式
+            scriptPattern = Pattern.compile("vbscript:", Pattern.CASE_INSENSITIVE);
+            value = scriptPattern.matcher(value).replaceAll("");
+            // 避免 onload= 表达式
+            scriptPattern = Pattern.compile("onload(.*?)=",
+                    Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
+            value = scriptPattern.matcher(value).replaceAll("");
+        }
+        return value;
+    }
+}

framework/src/main/java/cn/lili/common/security/filter/XssStringJsonSerializer.java

@@ -1,32 +0,0 @@
-package cn.lili.common.security.filter;
-
-
-import com.fasterxml.jackson.core.JsonGenerator;
-import com.fasterxml.jackson.databind.JsonSerializer;
-import com.fasterxml.jackson.databind.SerializerProvider;
-import org.apache.commons.text.StringEscapeUtils;
-
-import java.io.IOException;
-
-/**
- * 防止xss攻击 过滤字符串解析
- *
- * @author Chopper
- * @version v1.0
- * 2021-06-04 10:40
- */
-public class XssStringJsonSerializer extends JsonSerializer<String> {
-    @Override
-    public Class<String> handledType() {
-        return String.class;
-    }
-
-    @Override
-    public void serialize(String value, JsonGenerator jsonGenerator,
-                          SerializerProvider serializerProvider) throws IOException {
-        if (value != null) {
-            String encodedValue = StringEscapeUtils.escapeHtml4(value);
-            jsonGenerator.writeString(encodedValue);
-        }
-    }
-}