XSS vulnerability filtering with springboot

Kind little black brother 2021-01-22 15:53:01
xss vulnerability filtering springboot



background

I did a few projects a while ago , Finally, the development is complete , Into the testing phase , Deploy the project to the test environment with confidence , And then after the security evaluation .....

                 ​( what ! You said my code was unsafe ???)

And then we measured it Xss Loophole Security issues

Solution

scene : You can enter... In the page input box JS Script , An attacker can use this vulnerability to execute malicious code

Question presentation


So we have to deal with the parameters of the front-end transmission , Do unified global filtering

Since it's going to be filtered , We first need to implement a custom filter

It consists of four parts

XssUtil

XssFilterAutoConfig

XssHttpServletRequestWrapper

XssStringfJsonDeserializer

Finally, we need to use our implementation in the global filter Xss Custom filter

Code implementation

  • XssFilterAtuoConfig Implementation code
 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;
/**
* Created by wjy on 2020/11/5.
* xss Automatic configuration class
*/
@Configuration
public class XssFilterAtuoConfig {
/**
* Register a custom filter
* @return
*/
@Bean
public FilterRegistrationBean xssFiltrRegister() {
FilterRegistrationBean registration = new FilterRegistrationBean();
// Set up system filters (setFilter That's what you define as a filter filter class )
registration.setFilter(new SimpleCORSFilter());
// Filter all paths
registration.addUrlPatterns("/*");
// Filter name
registration.setName("XssFilter");
// priority
registration.setOrder(1);
return registration;
}
/**
* Filter JSON data
* @return
*/
@Bean
@Primary
public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
SimpleModule module = new SimpleModule();
// Custom serialization filter configuration (XssStringJsonDeserializer), Translate the input parameters
module.addDeserializer(String.class, new XssStringJsonDeserializer());
// Register parsers
ObjectMapper objectMapper = Jackson2ObjectMapperBuilder.json().build();
objectMapper.registerModule(module);
return new MappingJackson2HttpMessageConverter(objectMapper);
}
}

  • XssHttpServletRequestWrapper Implementation code
/**
* Created by wjy on 2020/11/5.
* xss packing
*/
public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {
public XssHttpServletRequestWrapper(HttpServletRequest request) {
super(request);
}
/**
* Yes header Handle
* @param name
* @return
*/
@Override
public String getHeader(String name) {
String value = super.getHeader(name);
return XssUtil.cleanXSS(value);
}
/**
* Processing of parameters
* @param name
* @return
*/
@Override
public String getParameter(String name) {
String value = super.getParameter(name);
return XssUtil.cleanXSS(value);
}
/**
* Deal with the value
* @param name
* @return
*/
@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);
}
/**
* Mainly aimed at HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE obtain pathvalue When I was young, I put the original pathvalue after xss To filter out
*/
@Override
public Object getAttribute(String name) {
// obtain pathvalue Value
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 Code implementation
 /**
* Created by wjy on 2020/11/5.
* be based on xss Of JsonDeserializer
*/
public class XssStringJsonDeserializer extends JsonDeserializer<String> {
@Override
public Class<String> handledType() {
return String.class;
}
@Override
public String deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
return XssUtil.cleanXSS(jsonParser.getValueAsString());
}
} 

  • XssUtil Code implementation
 /**
* Created by wjy on 2020/11/5.
* xss Tool class
*/
public class XssUtil {
public static String cleanXSS(String value) {
if (Objects.isNull(value)) {
return value;
}
// Here you can customize the characters you want to filter
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;
}
} 

Global filter implementation
 @Component
public class SimpleCORSFilter implements Filter {
@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
// ad locum , Using what we've achieved XSS filter
XssHttpServletRequestWrapper request =
new XssHttpServletRequestWrapper((HttpServletRequest) req);
HttpServletResponse response = (HttpServletResponse) res;
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods",
"POST, GET, PUT, OPTIONS, DELETE");
response.setHeader("Access-Control-Max-Age", "3600");
response.setHeader("Access-Control-Allow-Headers",
"Origin, X-Requested-With, Content-Type, Accept, token");
chain.doFilter(request, response);
}
public void init(FilterConfig filterConfig) {
}
public void destroy() {
}
} 

Okay , That's right Xss Handling of loopholes

If it helps you , See the one in the lower right corner “ One key, three links ” Did you? , That's right. Point it [ ha-ha ]

版权声明
本文为[Kind little black brother]所创,转载请带上原文链接,感谢
https://javamana.com/2021/01/20210122155005135D.html

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