CLAP-372 XSS 공격 방지 로직 구현

build.gradle

@@ -107,6 +107,8 @@ dependencies {
     implementation 'org.apache.tika:tika-core:2.9.0'
     implementation 'org.apache.tika:tika-parsers:2.9.0'
 
+    // Jsoup
+    implementation 'org.jsoup:jsoup:1.17.1'
 }
 
 tasks.named('test') {

src/main/java/clap/server/adapter/inbound/security/SecurityConfig.java

@@ -63,6 +63,19 @@ public SecurityFilterChain defaultFilterChain(HttpSecurity http) throws Exceptio
 
     private HttpSecurity defaultSecurity(HttpSecurity http) throws Exception {
         return http
+                .headers(headers -> headers
+                        .contentSecurityPolicy(csp ->
+                                csp.policyDirectives(
+                                        "default-src 'self'; " +
+                                                "script-src 'self' 'unsafe-inline' 'unsafe-eval'; " +
+                                                "style-src 'self' 'unsafe-inline'; " +
+                                                "img-src 'self' data: https:; " +
+                                                "font-src 'self' data: https:; " +
+                                                "object-src 'none'; " +
+                                                "base-uri 'self';"
+                                )
+                        )
+                )
                 .httpBasic(AbstractHttpConfigurer::disable)
                 .csrf(AbstractHttpConfigurer::disable)
                 .sessionManagement(

src/main/java/clap/server/adapter/inbound/web/xss/XssTestController.java

@@ -0,0 +1,54 @@
+package clap.server.adapter.inbound.web.xss;
+
+import clap.server.common.annotation.architecture.WebAdapter;
+import clap.server.common.annotation.swagger.DevelopOnlyApi;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@Slf4j
+@WebAdapter
+@RequestMapping("/api/xss-test")
+@Tag(name = "xss 공격 테스트 API", description = "아래와 같은 페이로드들에 대해 테스트합니다.\n" +
+        "1. 기본적인 스크립트 삽입: `<script>alert('xss')</script>`\n" +
+        "2. 이미지 태그를 이용한 XSS: `<img src=x onerror=alert('xss')>`\n" +
+        "3. JavaScript 프로토콜: `javascript:alert('xss')`\n" +
+        "4. HTML 이벤트 핸들러:` <div onmouseover=\"alert('xss')\">hover me</div>`\n" +
+        "5. SVG를 이용한 XSS: `<svg><script>alert('xss')</script></svg>`\n" +
+        "6. HTML5 태그를 이용한 XSS: `<video><source onerror=\"alert('xss')\">`")
+public class XssTestController {
+
+    @GetMapping
+    @DevelopOnlyApi
+    @Operation(summary = "단일 파라미터 test")
+    public ResponseEntity<String> testGetXss(@RequestParam String input) {
+        log.info("Received GET input: {}", input);
+        return ResponseEntity.ok("Processed GET input: " + input);
+    }
+
+    @PostMapping
+    @DevelopOnlyApi
+    @Operation(summary = "dto test")
+    public ResponseEntity<XssTestResponse> testPostXss(@RequestBody XssTestRequest request) {
+        log.info("Received POST input: {}", request);
+        return ResponseEntity.ok(new XssTestResponse(request.content()));
+    }
+
+    @GetMapping("/multi-params")
+    @Operation(summary = "다중 파라미터 테스트")
+    public ResponseEntity<String> testMultiParamXss(@RequestParam(value = "inputs", required = false) String[] inputs) {
+        if (inputs == null || inputs.length == 0) {
+            return ResponseEntity.badRequest().body("No inputs provided");
+        }
+
+        StringBuilder response = new StringBuilder("Processed inputs:\n");
+        for (int i = 0; i < inputs.length; i++) {
+            log.info("Received input {}: {}", i, inputs[i]);
+            response.append("Input ").append(i).append(": ").append(inputs[i]).append("\n");
+        }
+
+        return ResponseEntity.ok(response.toString());
+    }
+}

src/main/java/clap/server/adapter/inbound/web/xss/XssTestRequest.java

@@ -0,0 +1,8 @@
+package clap.server.adapter.inbound.web.xss;
+
+import jakarta.validation.constraints.NotNull;
+
+public record XssTestRequest(
+    @NotNull
+    String content
+) {}

src/main/java/clap/server/adapter/inbound/web/xss/XssTestResponse.java

@@ -0,0 +1,5 @@
+package clap.server.adapter.inbound.web.xss;
+
+public record XssTestResponse(
+    String sanitizedContent
+) {}

src/main/java/clap/server/adapter/inbound/xss/XssPreventionFilter.java

@@ -0,0 +1,22 @@
+package clap.server.adapter.inbound.xss;
+
+import jakarta.servlet.*;
+import jakarta.servlet.http.HttpServletRequest;
+import org.springframework.stereotype.Component;
+
+import java.io.IOException;
+
+@Component
+public class XssPreventionFilter implements Filter {
+
+    @Override
+    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
+            throws IOException, ServletException {
+        if (request instanceof HttpServletRequest) {
+            HttpServletRequest wrappedRequest = new XssRequestWrapper((HttpServletRequest) request);
+            chain.doFilter(wrappedRequest, response);
+        } else {
+            chain.doFilter(request, response);
+        }
+    }
+}

src/main/java/clap/server/adapter/inbound/xss/XssRequestWrapper.java

@@ -0,0 +1,56 @@
+package clap.server.adapter.inbound.xss;
+
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletRequestWrapper;
+import lombok.extern.slf4j.Slf4j;
+import org.jsoup.Jsoup;
+import org.jsoup.safety.Safelist;
+
+import java.util.Arrays;
+import java.util.Optional;
+
+@Slf4j
+public class XssRequestWrapper extends HttpServletRequestWrapper {
+
+    public XssRequestWrapper(HttpServletRequest request) {
+        super(request);
+    }
+
+    @Override
+    public String[] getParameterValues(String parameter) {
+        return Optional.ofNullable(super.getParameterValues(parameter))
+            .map(values -> Arrays.stream(values)
+                .map(this::sanitize)
+                .toArray(String[]::new))
+            .orElse(null);
+    }
+
+    @Override
+    public String getParameter(String parameter) {
+        String value = super.getParameter(parameter);
+        String sanitizedValue = Optional.ofNullable(value)
+                .map(this::sanitize)
+                .orElse(null);
+        log.info("Original parameter [{}]: {}", parameter, value);
+        log.info("Sanitized parameter [{}]: {}", parameter, sanitizedValue);
+        return sanitizedValue;
+    }
+
+    @Override
+    public String getHeader(String name) {
+        return Optional.ofNullable(super.getHeader(name))
+                .map(this::sanitize)
+                .orElse(null);
+    }
+
+
+    public String sanitize(String value) {
+        if (value == null) {
+            return null;
+        }
+        if (value.toLowerCase().startsWith("javascript:")) {
+            return "";
+        }
+        return Jsoup.clean(value, Safelist.basic());
+    }
+}

src/main/java/clap/server/config/jackson/JacksonConfig.java

@@ -0,0 +1,43 @@
+package clap.server.config.jackson;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import lombok.extern.slf4j.Slf4j;
+import org.jsoup.Jsoup;
+import org.jsoup.safety.Safelist;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import java.io.IOException;
+
+// XSS 방지를 위한 Jackson 설정
+@Slf4j
+@Configuration
+public class JacksonConfig {
+
+    @Bean
+    public ObjectMapper objectMapper() {
+        ObjectMapper mapper = new ObjectMapper();
+        SimpleModule module = new SimpleModule();
+        module.addDeserializer(String.class, new JsonHtmlXssDeserializer());
+        mapper.registerModule(module);
+        return mapper;
+    }
+
+    public static class JsonHtmlXssDeserializer extends JsonDeserializer<String> {
+        @Override
+        public String deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
+            String value = p.getText();
+            if (value == null) {
+                return null;
+            }
+            if (value.toLowerCase().startsWith("javascript:")) {
+                return "";
+            }
+            return Jsoup.clean(value, Safelist.basic());
+        }
+    }
+}

src/main/java/clap/server/config/web/WebConfig.java

@@ -0,0 +1,20 @@
+package clap.server.config.web;
+
+import clap.server.adapter.inbound.xss.XssPreventionFilter;
+import org.springframework.boot.web.servlet.FilterRegistrationBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.Ordered;
+
+@Configuration
+public class WebConfig {
+
+    @Bean
+    public FilterRegistrationBean<XssPreventionFilter> xssPreventionFilterRegistrationBean() {
+        FilterRegistrationBean<XssPreventionFilter> registrationBean = new FilterRegistrationBean<>();
+        registrationBean.setFilter(new XssPreventionFilter());
+        registrationBean.setOrder(Ordered.HIGHEST_PRECEDENCE);
+        registrationBean.addUrlPatterns("/*");
+        return registrationBean;
+    }
+}