前阵子做了几个项目，终于开发完毕，进入了测试阶段，信心满满将项目部署到测试环境，然后做了安全测评之后.....
(什么！你竟然说我代码不安全？？？)
然后测出了 Xss漏洞 安全的问题
解决方案场景：可以在页面输入框输入JS脚本， 攻击者可以利用此漏洞执行恶意的代码 ！
问题演示
所以我们要对于前端传输的参数做处理，做统一全局过滤处理
既然要过滤处理，我们首先需要实现一个自定义过滤器
总共包含以下四部分
- XssUtil
- XssFilterAutoConfig
- XssHttpServletRequestWrapper
- XssStringfJsonDeserializer
最后我们需要在全局过滤器中使用我们实现的Xss自定义过滤器
代码实现XssFilterAtuoConfig实现代码
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import net.greatsoft.overallbudget.filter.SimpleCORSFilter;
import org.springframework.boot.context.embedded.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
@Configuration
public class XssFilterAtuoConfig {
@Bean
public FilterRegistrationBean xssFiltrRegister() {
FilterRegistrationBean registration = new FilterRegistrationBean();
//设置系统过滤器 (setFilter就是你所定义的过滤器filter类)
registration.setFilter(new SimpleCORSFilter());
//过滤所有路径
registration.addUrlPatterns("
@Bean
@Primary
public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
SimpleModule module = new SimpleModule();
//自定义序列化过滤配置(XssStringJsonDeserializer), 对入参进行转译
module.addDeserializer(String.class, new XssStringJsonDeserializer());
// 注册解析器
ObjectMapper objectMapper = Jackson2ObjectMapperBuilder.json().build();
objectMapper.registerModule(module);
return new MappingJackson2HttpMessageConverter(objectMapper);
}
}
XssHttpServletRequestWrapper实现代码
public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {
public XssHttpServletRequestWrapper(HttpServletRequest request) {
super(request);
}
@Override
public String getHeader(String name) {
String value = super.getHeader(name);
return XssUtil.cleanXSS(value);
}
@Override
public String getParameter(String name) {
String value = super.getParameter(name);
return XssUtil.cleanXSS(value);
}
@Override
public String[] getParameterValues(String name) {
String[] values = super.getParameterValues(name);
if (values != null) {
int length = values.length;
String[] escapsevalues = new String[length];
for (int i = 0; i < length; i++) {
escapsevalues[i] = XssUtil.cleanXSS(values[i]);
}
return escapsevalues;
}
return super.getParameterValues(name);
}
@Override
public Object getAttribute(String name) {
// 获取pathvalue的值
if (HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE.equals(name)) {
Map uriTemplateVars = (Map) super.getAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE);
if (Objects.isNull(uriTemplateVars)) {
return uriTemplateVars;
}
Map newMap = new linkedHashMap<>();
uriTemplateVars.forEach((key, value) -> {
if (value instanceof String) {
newMap.put(key, XssUtil.cleanXSS((String) value));
} else {
newMap.put(key, value);
}
});
return newMap;
} else {
return super.getAttribute(name);
}
}
}
XssStringJsonDeserializer代码实现
public class XssStringJsonDeserializer extends JsonDeserializer{ @Override public Class handledType() { return String.class; } @Override public String deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException { return XssUtil.cleanXSS(jsonParser.getValueAsString()); } }
XssUtil代码实现
public class XssUtil {
public static String cleanXSS(String value) {
if (Objects.isNull(value)) {
return value;
}
//在这里自定义需要过滤的字符
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("