src/main/java/net/hostsharing/hsadminng/config/CasAuthenticationFilter.java

@@ -0,0 +1,35 @@
+package net.hostsharing.hsadminng.config;
+
+import jakarta.servlet.Filter;
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.ServletRequest;
+import jakarta.servlet.ServletResponse;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+import lombok.SneakyThrows;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class CasAuthenticationFilter implements Filter {
+
+    @Autowired
+    private CasServiceTicketValidator ticketValidator;
+
+    @Override
+    @SneakyThrows
+    public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain) {
+        final var httpRequest = (HttpServletRequest) request;
+        final var httpResponse = (HttpServletResponse) response;
+
+        final var ticket = httpRequest.getHeader("Authorization");
+
+        if (ticket == null || !ticketValidator.validateTicket(ticket)) {
+            httpResponse.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
+            return;
+        }
+
+        chain.doFilter(request, response);
+    }
+}

src/main/java/net/hostsharing/hsadminng/config/CasServiceTicketValidator.java

@@ -0,0 +1,40 @@
+package net.hostsharing.hsadminng.config;
+
+import lombok.SneakyThrows;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+import javax.xml.parsers.DocumentBuilderFactory;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
+
+@Service
+public class CasServiceTicketValidator {
+
+    @Value("${hsadminng.cas.server-url}")
+    private String casServerUrl;
+
+    @Value("${hsadminng.cas.service-url}")
+    private String serviceUrl;
+
+    private final RestTemplate restTemplate = new RestTemplate();
+
+    @SneakyThrows
+    public boolean validateTicket(final String ticket) {
+        if (casServerUrl.equals("fake") && ticket.equals("test")) {
+            return true;
+        }
+
+        final var url = casServerUrl + "/p3/serviceValidate" +
+                "?service=" + URLEncoder.encode(serviceUrl, StandardCharsets.UTF_8) +
+                "&ticket=" + URLEncoder.encode(ticket, StandardCharsets.UTF_8);
+
+        final var response = restTemplate.getForObject(url, String.class);
+
+        final var doc = DocumentBuilderFactory.newInstance().newDocumentBuilder()
+                .parse(new java.io.ByteArrayInputStream(response.getBytes()));
+
+        return doc.getElementsByTagName("cas:authenticationSuccess").getLength() > 0;
+    }
+}

src/main/resources/application.yml

@@ -36,6 +36,9 @@ liquibase:
 hsadminng:
     postgres:
         leakproof:
+    cas:
+        server-url: https://cas.example.com/cas
+        service-url: http://localhost:8080/api # TODO.conf: deployment target
 
 metrics:
     distribution:

src/test/java/net/hostsharing/hsadminng/config/CasAuthenticationFilterIntegrationTest.java

@@ -0,0 +1,31 @@
+package net.hostsharing.hsadminng.config;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.http.HttpStatus;
+import org.springframework.test.context.TestPropertySource;
+
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+@TestPropertySource(properties = {"server.port=0"})
+// IMPORTANT: To test prod config, do not use test profile!
+class CasAuthenticationFilterIntegrationTest {
+
+    @Value("${local.server.port}")
+    private int serverPort;
+
+    @Autowired
+    private TestRestTemplate restTemplate;
+
+    @Test
+    public void shouldRejectRequest() {
+        final var result = this.restTemplate.getForEntity(
+                "http://localhost:" + this.serverPort + "/api/ping", String.class);
+        assertThat(result.getStatusCode()).isEqualTo(HttpStatus.UNAUTHORIZED);
+    }
+}

src/test/java/net/hostsharing/hsadminng/config/WebSecurityConfigIntegrationTest.java

@@ -8,13 +8,16 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatus;
 import org.springframework.test.context.TestPropertySource;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
 @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
-@TestPropertySource(properties = {"management.port=0", "server.port=0"})
+@TestPropertySource(properties = {"management.port=0", "server.port=0", "hsadminng.cas.server-url=fake"})
 // IMPORTANT: To test prod config, do not use test profile!
 class WebSecurityConfigIntegrationTest {
 
@@ -29,8 +32,18 @@ class WebSecurityConfigIntegrationTest {
 
     @Test
     public void shouldSupportPingEndpoint() {
-        final var result = this.restTemplate.getForEntity(
-                "http://localhost:" + this.serverPort + "/api/ping", String.class);
+        // fake Authorization header
+        final var headers = new HttpHeaders();
+        headers.set("Authorization", "test");
+
+        // http request
+        final var result = restTemplate.exchange(
+                "http://localhost:" + this.serverPort + "/api/ping",
+                HttpMethod.GET,
+                new HttpEntity<Object>(null, headers),
+                String.class
+        );
+
         assertThat(result.getStatusCode()).isEqualTo(HttpStatus.OK);
         assertThat(result.getBody()).startsWith("pong");
     }

src/test/java/net/hostsharing/hsadminng/hs/scenarios/UseCase.java

@@ -160,6 +160,7 @@ public abstract class UseCase<T extends UseCase<?>> {
                 .GET()
                 .uri(new URI("http://localhost:" + testSuite.port + uriPath))
                 .header("current-subject", ScenarioTest.RUN_AS_USER)
+                .header("Authorization", "test")
                 .timeout(seconds(10))
                 .build();
         final var response = client.send(request, BodyHandlers.ofString());
@@ -175,6 +176,7 @@ public abstract class UseCase<T extends UseCase<?>> {
                 .uri(new URI("http://localhost:" + testSuite.port + uriPath))
                 .header("Content-Type", "application/json")
                 .header("current-subject", ScenarioTest.RUN_AS_USER)
+                .header("Authorization", "test")
                 .timeout(seconds(10))
                 .build();
         final var response = client.send(request, BodyHandlers.ofString());
@@ -190,6 +192,7 @@ public abstract class UseCase<T extends UseCase<?>> {
                 .uri(new URI("http://localhost:" + testSuite.port + uriPath))
                 .header("Content-Type", "application/json")
                 .header("current-subject", ScenarioTest.RUN_AS_USER)
+                .header("Authorization", "test")
                 .timeout(seconds(10))
                 .build();
         final var response = client.send(request, BodyHandlers.ofString());
@@ -204,6 +207,7 @@ public abstract class UseCase<T extends UseCase<?>> {
                 .uri(new URI("http://localhost:" + testSuite.port + uriPath))
                 .header("Content-Type", "application/json")
                 .header("current-subject", ScenarioTest.RUN_AS_USER)
+                .header("Authorization", "test")
                 .timeout(seconds(10))
                 .build();
         final var response = client.send(request, BodyHandlers.ofString());

src/test/resources/application.yml

@@ -51,3 +51,7 @@ testcontainers:
     network:
         mode: host
 
+hsadminng:
+    cas:
+        server-url: fake
+        service-url: http://localhost:8080/api # not really used in test config