Not allow access to supervision endpoints (#118)

Signed-off-by: achour94 <[email protected]>

src/main/java/org/gridsuite/gateway/filters/SupervisionAccessControlFilter.java

@@ -0,0 +1,65 @@
+/**
+ * Copyright (c) 2024, RTE (http://www.rte-france.com)
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+package org.gridsuite.gateway.filters;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.cloud.gateway.filter.GatewayFilterChain;
+import org.springframework.core.Ordered;
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Component;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+
+import java.util.regex.Pattern;
+
+/**
+ * A global pre-filter that controls access to supervision endpoints in the API gateway.
+ *
+ * This filter inspects the incoming request path and blocks access to specific supervision
+ * endpoints based on a predefined pattern. The filter is designed to enhance security by
+ * restricting access to potentially sensitive supervision functionalities.
+ *
+ * The filter blocks access to paths matching the following pattern:
+ * {@code /v<number>/supervision} or {@code /v<number>/supervision/<any-sub-path>}
+ * where {@code <number>} can be any positive integer representing the API version.
+ *
+ * Examples of blocked paths:
+ * - /v1/supervision
+ * - /v2/supervision/
+ * - /v10/supervision/health
+ * - /v999/supervision/metrics
+ *
+ * When a matching path is detected, the filter responds with a 403 Forbidden status.
+ *
+ * @author Achour BERRAHMA <achour.berrahma at rte-france.com>
+ */
+@Component
+public class SupervisionAccessControlFilter extends AbstractGlobalPreFilter {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(SupervisionAccessControlFilter.class);
+    private static final Pattern SUPERVISION_PATTERN = Pattern.compile("^/v\\d+/supervision(/.*)?$");
+    public static final String ACCESS_TO_SUPERVISION_ENDPOINT_IS_NOT_ALLOWED = "{}: 403 Forbidden, Access to supervision endpoint is not allowed";
+
+    @Override
+    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
+        String path = exchange.getRequest().getURI().getPath();
+        if (SUPERVISION_PATTERN.matcher(path).matches()) {
+            LOGGER.info(ACCESS_TO_SUPERVISION_ENDPOINT_IS_NOT_ALLOWED,
+                    exchange.getRequest().getPath());
+            return completeWithCode(exchange, HttpStatus.FORBIDDEN);
+        }
+
+        return chain.filter(exchange);
+    }
+
+    @Override
+    public int getOrder() {
+        // Execute after TokenValidatorGlobalPreFilter and UserAdminControlGlobalPreFilter
+        return Ordered.LOWEST_PRECEDENCE - 2;
+    }
+}

src/test/java/org/gridsuite/gateway/ElementAccessControlTest.java

@@ -552,6 +552,28 @@ public void testDeleteElements() {
             .expectStatus().isOk();
     }
 
+    @Test
+    public void testSupervisionEndpointsAccess() {
+        initStubForJwk();
+
+        // Test access to a supervision endpoint (should be forbidden)
+        webClient.get().uri("study/v1/supervision/studies")
+            .header("Authorization", "Bearer " + tokenUser1)
+            .exchange()
+            .expectStatus().isForbidden();
+
+        // Test access to an endpoint containing 'supervision' but not matching the blocked pattern
+        // This should pass through the filter
+        stubFor(get(urlEqualTo("/v1/studies/supervision-report"))
+                .withHeader("userId", equalTo("user1"))
+                .willReturn(aResponse().withStatus(200)));
+
+        webClient.get().uri("study/v1/studies/supervision-report")
+                .header("Authorization", "Bearer " + tokenUser1)
+                .exchange()
+                .expectStatus().isOk();
+    }
+
     @Test
     public void testAccessControlInfos() {
         List<UUID> emptyList = List.of();