feat: perform permissions checks for the User and KSQL service principal

ksql-engine/src/main/java/io/confluent/ksql/security/KsqlAuthorizationValidatorImpl.java

@@ -19,6 +19,7 @@
 import io.confluent.ksql.metastore.MetaStore;
 import io.confluent.ksql.metastore.model.DataSource;
 import io.confluent.ksql.parser.tree.CreateAsSelect;
+import io.confluent.ksql.parser.tree.CreateSource;
 import io.confluent.ksql.parser.tree.InsertInto;
 import io.confluent.ksql.parser.tree.PrintTopic;
 import io.confluent.ksql.parser.tree.Query;
@@ -51,6 +52,8 @@ public void checkAuthorization(
       validateCreateAsSelect(serviceContext, metaStore, (CreateAsSelect)statement);
     } else if (statement instanceof PrintTopic) {
       validatePrintTopic(serviceContext, (PrintTopic)statement);
+    } else if (statement instanceof CreateSource) {
+      validateCreateSource(serviceContext, (CreateSource)statement);
     }
   }
 
@@ -111,6 +114,14 @@ private void validatePrintTopic(
     checkAccess(serviceContext, printTopic.getTopic().toString(), AclOperation.READ);
   }
 
+  private void validateCreateSource(
+      final ServiceContext serviceContext,
+      final CreateSource createSource
+  ) {
+    final String sourceTopic = createSource.getProperties().getKafkaTopic();
+    checkAccess(serviceContext, sourceTopic, AclOperation.READ);
+  }
+
   private String getSourceTopicName(final MetaStore metaStore, final String streamOrTable) {
     final DataSource<?> dataSource = metaStore.getSource(streamOrTable);
     if (dataSource == null) {

ksql-engine/src/test/java/io/confluent/ksql/security/KsqlAuthorizationImplTest.java

@@ -376,6 +376,39 @@ public void shouldThrowWhenThrowPrintTopicWithoutReadPermissionsDenied() {
     authorizationValidator.checkAuthorization(serviceContext, metaStore, statement);
   }
 
+  @Test
+  public void shouldCreateSourceWithReadPermissionsAllowed() {
+    // Given:
+    givenTopicPermissions(TOPIC_1, Collections.singleton(AclOperation.READ));
+    final Statement statement = givenStatement(String.format(
+        "CREATE STREAM s1 WITH (kafka_topic='%s', value_format='JSON');", TOPIC_NAME_1)
+    );
+
+    // When:
+    authorizationValidator.checkAuthorization(serviceContext, metaStore, statement);
+
+    // Then:
+    // Above command should not throw any exception
+  }
+
+  @Test
+  public void shouldThrowWhenCreateSourceWithoutReadPermissionsDenied() {
+    // Given:
+    givenTopicPermissions(TOPIC_1, Collections.singleton(AclOperation.WRITE));
+    final Statement statement = givenStatement(String.format(
+        "CREATE STREAM s1 WITH (kafka_topic='%s', value_format='JSON');", TOPIC_NAME_1)
+    );
+
+    // Then:
+    expectedException.expect(KsqlTopicAuthorizationException.class);
+    expectedException.expectMessage(String.format(
+        "Authorization denied to Read on topic(s): [%s]", TOPIC_1.name()
+    ));
+
+    // When:
+    authorizationValidator.checkAuthorization(serviceContext, metaStore, statement);
+  }
+
   @Test
   public void shouldThrowExceptionWhenTopicClientFails() {
     // Given:

ksql-rest-app/src/main/java/io/confluent/ksql/rest/server/computation/DistributingExecutor.java

@@ -15,11 +15,13 @@
 package io.confluent.ksql.rest.server.computation;
 
 import io.confluent.ksql.KsqlExecutionContext;
+import io.confluent.ksql.metastore.MetaStore;
 import io.confluent.ksql.parser.tree.Statement;
 import io.confluent.ksql.rest.entity.CommandStatus;
 import io.confluent.ksql.rest.entity.CommandStatusEntity;
 import io.confluent.ksql.rest.entity.KsqlEntity;
 import io.confluent.ksql.rest.server.execution.StatementExecutor;
+import io.confluent.ksql.security.KsqlAuthorizationValidator;
 import io.confluent.ksql.services.ServiceContext;
 import io.confluent.ksql.statement.ConfiguredStatement;
 import io.confluent.ksql.statement.Injector;
@@ -40,15 +42,20 @@ public class DistributingExecutor implements StatementExecutor<Statement> {
   private final CommandQueue commandQueue;
   private final Duration distributedCmdResponseTimeout;
   private final BiFunction<KsqlExecutionContext, ServiceContext, Injector> injectorFactory;
+  private final KsqlAuthorizationValidator authorizationValidator;
 
   public DistributingExecutor(
       final CommandQueue commandQueue,
       final Duration distributedCmdResponseTimeout,
-      final BiFunction<KsqlExecutionContext, ServiceContext, Injector> injectorFactory) {
+      final BiFunction<KsqlExecutionContext, ServiceContext, Injector> injectorFactory,
+      final KsqlAuthorizationValidator authorizationValidator
+  ) {
     this.commandQueue = Objects.requireNonNull(commandQueue, "commandQueue");
     this.distributedCmdResponseTimeout =
         Objects.requireNonNull(distributedCmdResponseTimeout, "distributedCmdResponseTimeout");
     this.injectorFactory = Objects.requireNonNull(injectorFactory, "injectorFactory");
+    this.authorizationValidator =
+        Objects.requireNonNull(authorizationValidator, "authorizationValidator");
   }
 
   @Override
@@ -61,6 +68,8 @@ public Optional<KsqlEntity> execute(
         .apply(executionContext, serviceContext)
         .inject(statement);
 
+    checkAuthorization(injected, serviceContext, executionContext);
+
     try {
       final QueuedCommandStatus queuedCommandStatus = commandQueue.enqueueCommand(injected);
       final CommandStatus commandStatus = queuedCommandStatus
@@ -78,4 +87,27 @@ public Optional<KsqlEntity> execute(
           statement.getStatementText()), e);
     }
   }
+
+  private void checkAuthorization(
+      final ConfiguredStatement<?> configured,
+      final ServiceContext userServiceContext,
+      final KsqlExecutionContext serverExecutionContext
+  ) {
+    final Statement statement = configured.getStatement();
+    final MetaStore metaStore = serverExecutionContext.getMetaStore();
+
+    // Check the User will be permitted to execute this statement
+    authorizationValidator.checkAuthorization(userServiceContext, metaStore, statement);
+
+    try {
+      // Check the KSQL service principal will be permitted too
+      authorizationValidator.checkAuthorization(
+          serverExecutionContext.getServiceContext(),
+          metaStore,
+          statement
+      );
+    } catch (final Exception e) {
+      throw new KsqlServerException("The KSQL server is not permitted to execute the command", e);
+    }
+  }
 }

ksql-rest-app/src/main/java/io/confluent/ksql/rest/server/resources/KsqlResource.java

@@ -121,7 +121,9 @@ public KsqlResource(
         new DistributingExecutor(
             commandQueue,
             distributedCmdResponseTimeout,
-            injectorFactory),
+            injectorFactory,
+            authorizationValidator
+        ),
         ksqlEngine,
         ksqlConfig,
         new DefaultCommandQueueSync(

ksql-rest-app/src/test/java/io/confluent/ksql/rest/server/computation/DistributingExecutorTest.java

@@ -16,14 +16,20 @@
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.instanceOf;
 import static org.hamcrest.Matchers.is;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doThrow;
+import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
 import com.google.common.collect.ImmutableMap;
+import io.confluent.ksql.KsqlExecutionContext;
+import io.confluent.ksql.exception.KsqlTopicAuthorizationException;
+import io.confluent.ksql.metastore.MetaStore;
 import io.confluent.ksql.parser.KsqlParser.PreparedStatement;
 import io.confluent.ksql.parser.tree.ListProperties;
 import io.confluent.ksql.parser.tree.Statement;
@@ -32,6 +38,7 @@
 import io.confluent.ksql.rest.entity.CommandStatusEntity;
 import io.confluent.ksql.rest.server.computation.CommandId.Action;
 import io.confluent.ksql.rest.server.computation.CommandId.Type;
+import io.confluent.ksql.security.KsqlAuthorizationValidator;
 import io.confluent.ksql.services.ServiceContext;
 import io.confluent.ksql.statement.ConfiguredStatement;
 import io.confluent.ksql.statement.Injector;
@@ -73,6 +80,9 @@ public class DistributingExecutorTest {
   @Mock ServiceContext serviceContext;
   @Mock Injector schemaInjector;
   @Mock Injector topicInjector;
+  @Mock KsqlAuthorizationValidator authorizationValidator;
+  @Mock KsqlExecutionContext executionContext;
+  @Mock MetaStore metaStore;
 
   private DistributingExecutor distributor;
   private AtomicLong scnCounter;
@@ -86,17 +96,21 @@ public void setUp() throws InterruptedException {
     when(status.tryWaitForFinalStatus(any())).thenReturn(SUCCESS_STATUS);
     when(status.getCommandId()).thenReturn(CS_COMMAND);
     when(status.getCommandSequenceNumber()).thenAnswer(inv -> scnCounter.incrementAndGet());
+    when(executionContext.getMetaStore()).thenReturn(metaStore);
+    when(executionContext.getServiceContext()).thenReturn(serviceContext);
 
     distributor = new DistributingExecutor(
         queue,
         DURATION_10_MS,
-        (ec, sc) -> InjectorChain.of(schemaInjector, topicInjector));
+        (ec, sc) -> InjectorChain.of(schemaInjector, topicInjector),
+        authorizationValidator
+    );
   }
 
   @Test
   public void shouldEnqueueSuccessfulCommand() throws InterruptedException {
     // When:
-    distributor.execute(EMPTY_STATEMENT, null, serviceContext);
+    distributor.execute(EMPTY_STATEMENT, executionContext, serviceContext);
 
     // Then:
     verify(queue, times(1)).enqueueCommand(eq(EMPTY_STATEMENT));
@@ -105,7 +119,7 @@ public void shouldEnqueueSuccessfulCommand() throws InterruptedException {
   @Test
   public void shouldInferSchemas() {
     // When:
-    distributor.execute(EMPTY_STATEMENT, null, serviceContext);
+    distributor.execute(EMPTY_STATEMENT, executionContext, serviceContext);
 
     // Then:
     verify(schemaInjector, times(1)).inject(eq(EMPTY_STATEMENT));
@@ -117,7 +131,7 @@ public void shouldReturnCommandStatus() {
     final CommandStatusEntity commandStatusEntity =
         (CommandStatusEntity) distributor.execute(
             EMPTY_STATEMENT,
-            null,
+            executionContext,
             serviceContext
         )
             .orElseThrow(null);
@@ -150,7 +164,7 @@ public void shouldThrowExceptionOnFailureToEnqueue() {
     expectedException.expectCause(is(cause));
 
     // When:
-    distributor.execute(configured, null, serviceContext);
+    distributor.execute(configured, executionContext, serviceContext);
   }
 
   @Test
@@ -167,7 +181,43 @@ public void shouldThrowFailureIfCannotInferSchema() {
     expectedException.expectMessage("Could not infer!");
 
     // When:
-    distributor.execute(configured, null, serviceContext);
+    distributor.execute(configured, executionContext, serviceContext);
   }
 
+  @Test
+  public void shouldThrowExceptionIfUserServiceContextIsDeniedAuthorization() {
+    // Given:
+    final ServiceContext userServiceContext = mock(ServiceContext.class);
+    final PreparedStatement<Statement> preparedStatement =
+        PreparedStatement.of("", new ListProperties(Optional.empty()));
+    final ConfiguredStatement<Statement> configured =
+        ConfiguredStatement.of(preparedStatement, ImmutableMap.of(), KSQL_CONFIG);
+    doThrow(KsqlTopicAuthorizationException.class).when(authorizationValidator)
+        .checkAuthorization(eq(userServiceContext), any(), eq(configured.getStatement()));
+
+    // Expect:
+    expectedException.expect(KsqlTopicAuthorizationException.class);
+
+    // When:
+    distributor.execute(configured, executionContext, userServiceContext);
+  }
+
+  @Test
+  public void shouldThrowServerExceptionIfServerServiceContextIsDeniedAuthorization() {
+    // Given:
+    final ServiceContext userServiceContext = mock(ServiceContext.class);
+    final PreparedStatement<Statement> preparedStatement =
+        PreparedStatement.of("", new ListProperties(Optional.empty()));
+    final ConfiguredStatement<Statement> configured =
+        ConfiguredStatement.of(preparedStatement, ImmutableMap.of(), KSQL_CONFIG);
+    doThrow(KsqlTopicAuthorizationException.class).when(authorizationValidator)
+        .checkAuthorization(eq(serviceContext), any(), eq(configured.getStatement()));
+
+    // Expect:
+    expectedException.expect(KsqlServerException.class);
+    expectedException.expectCause(is(instanceOf(KsqlTopicAuthorizationException.class)));
+
+    // When:
+    distributor.execute(configured, executionContext, userServiceContext);
+  }
 }