diff --git a/BUILD b/BUILD
index 109f79a..6aa6df5 100644
--- a/BUILD
+++ b/BUILD
@@ -1,5 +1,6 @@
 load("//tools/bzl:genrule2.bzl", "genrule2")
-load("//tools/bzl:plugin.bzl", "gerrit_plugin")
+load("//tools/bzl:plugin.bzl", "PLUGIN_DEPS", "PLUGIN_TEST_DEPS", "gerrit_plugin")
+load("//tools/bzl:junit.bzl", "junit_tests")
 
 gerrit_plugin(
     name = "gitiles",
@@ -41,3 +42,16 @@
         "zip -qr $$ROOT/$@ .",
     ]),
 )
+
+junit_tests(
+    name = "gitiles_tests",
+    srcs = glob(["src/test/java/**/*Test.java"]),
+    tags = ["gitiles"],
+    visibility = ["//visibility:public"],
+    runtime_deps = [":gitiles__plugin"],
+    deps = PLUGIN_TEST_DEPS + PLUGIN_DEPS + [
+        ":gitiles__plugin",
+        "//javatests/com/google/gerrit/util/http/testutil",
+        "//lib/gitiles",
+    ],
+)
diff --git a/src/main/java/com/googlesource/gerrit/plugins/gitiles/FilteredRepository.java b/src/main/java/com/googlesource/gerrit/plugins/gitiles/FilteredRepository.java
index 59c537a..29258f0 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/gitiles/FilteredRepository.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/gitiles/FilteredRepository.java
@@ -46,6 +46,7 @@
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.lib.RepositoryBuilder;
 import org.eclipse.jgit.lib.StoredConfig;
+import org.eclipse.jgit.transport.ServiceMayNotContinueException;
 
 class FilteredRepository extends Repository {
   static class Factory {
@@ -69,9 +70,16 @@
     FilteredRepository create(Project.NameKey name)
         throws NoSuchProjectException, IOException, PermissionBackendException {
       Optional<ProjectState> projectState = projectCache.get(name);
-      if (!projectState.get().statePermitsRead()) {
+      if (!projectState.isPresent() || !projectState.get().statePermitsRead()) {
         throw new NoSuchProjectException(name);
       }
+      try {
+        permissionBackend.currentUser().project(name).check(ProjectPermission.ACCESS);
+      } catch (AuthException e) {
+        throw new NoSuchProjectException(name, e);
+      } catch (PermissionBackendException e) {
+        throw new ServiceMayNotContinueException(e);
+      }
       return new FilteredRepository(
           projectState.get(),
           userProvider.get(),
diff --git a/src/main/java/com/googlesource/gerrit/plugins/gitiles/Resolver.java b/src/main/java/com/googlesource/gerrit/plugins/gitiles/Resolver.java
index 217dafc..71f604c 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/gitiles/Resolver.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/gitiles/Resolver.java
@@ -30,7 +30,7 @@
 import org.eclipse.jgit.transport.resolver.RepositoryResolver;
 import org.eclipse.jgit.transport.resolver.ServiceNotAuthorizedException;
 
-class Resolver implements RepositoryResolver<HttpServletRequest> {
+public class Resolver implements RepositoryResolver<HttpServletRequest> {
   private static final String NAME_KEY_ATTRIBUTE = Resolver.class.getName() + "/NameKey";
   private final Provider<CurrentUser> userProvider;
 
diff --git a/src/test/java/com/googlesource/gerrit/plugins/gitiles/ListProjectsAccessTest.java b/src/test/java/com/googlesource/gerrit/plugins/gitiles/ListProjectsAccessTest.java
new file mode 100644
index 0000000..4bdbca6
--- /dev/null
+++ b/src/test/java/com/googlesource/gerrit/plugins/gitiles/ListProjectsAccessTest.java
@@ -0,0 +1,101 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.googlesource.gerrit.plugins.gitiles;
+
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.gerrit.acceptance.testsuite.project.TestProjectUpdate.allow;
+import static com.google.gerrit.server.group.SystemGroupBackend.ANONYMOUS_USERS;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.gerrit.acceptance.LightweightPluginDaemonTest;
+import com.google.gerrit.acceptance.TestPlugin;
+import com.google.gerrit.acceptance.testsuite.project.ProjectOperations;
+import com.google.gerrit.acceptance.testsuite.request.RequestScopeOperations;
+import com.google.gerrit.common.data.Permission;
+import com.google.gerrit.entities.Project;
+import com.google.gerrit.extensions.api.projects.BranchInput;
+import com.google.gerrit.testing.ConfigSuite;
+import com.google.gerrit.util.http.testutil.FakeHttpServletRequest;
+import java.util.stream.Collectors;
+import javax.inject.Inject;
+import org.eclipse.jgit.lib.Config;
+import org.junit.After;
+import org.junit.Test;
+
+@TestPlugin(name = "gitiles", sysModule = "com.googlesource.gerrit.plugins.gitiles.Module")
+public class ListProjectsAccessTest extends LightweightPluginDaemonTest {
+  @ConfigSuite.Default
+  public static Config defaultConfig() {
+    // Required config parameters to run Gitiles.
+    Config cfg = new Config();
+    cfg.setString("gerrit", null, "gitHttpUrl", "http://example.com/gitiles");
+    return cfg;
+  }
+
+  @Inject private RequestScopeOperations requestScopeOperations;
+  @Inject private ProjectOperations projectOperations;
+
+  @After
+  public void cleanUp() {
+    projectOperations.project(project).forUpdate().removeAllAccessSections().update();
+  }
+
+  @Test
+  public void listRepositories_repositoryVisibilityIsRespected() throws Exception {
+    projectOperations.allProjectsForUpdate().removeAllAccessSections().update();
+    projectOperations.newProject().name("visible").create();
+    projectOperations.newProject().name("invisible").create();
+    projectOperations
+        .project(Project.nameKey("visible"))
+        .forUpdate()
+        .add(allow(Permission.READ).ref("refs/heads/main").group(ANONYMOUS_USERS))
+        .update();
+    requestScopeOperations.setApiUserAnonymous();
+
+    assertThat(access().listRepositories(null, ImmutableSet.of()).keySet())
+        .containsExactly("visible");
+  }
+
+  @Test
+  public void listBranches_branchVisiblityIsRespected() throws Exception {
+    projectOperations.allProjectsForUpdate().removeAllAccessSections().update();
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(allow(Permission.READ).ref("refs/heads/visible").group(ANONYMOUS_USERS))
+        .add(allow(Permission.CREATE).ref("refs/*").group(ANONYMOUS_USERS))
+        .add(allow(Permission.PUSH).ref("refs/*").group(ANONYMOUS_USERS))
+        .update();
+    gApi.projects().name(project.get()).branch("refs/heads/visible").create(new BranchInput());
+    gApi.projects().name(project.get()).branch("refs/heads/invisible").create(new BranchInput());
+    requestScopeOperations.setApiUserAnonymous();
+
+    assertThat(
+            access()
+                .listRepositories(
+                    null, ImmutableSet.of("refs/heads/visible", "refs/heads/invisible"))
+                .values().stream()
+                .map(r -> r.branches.keySet())
+                .collect(Collectors.toList()))
+        .containsExactly(ImmutableSet.of("refs/heads/visible"));
+  }
+
+  private GerritGitilesAccess access() {
+    return plugin
+        .getSysInjector()
+        .getInstance(GerritGitilesAccess.Factory.class)
+        .forRequest(new FakeHttpServletRequest());
+  }
+}
diff --git a/src/test/java/com/googlesource/gerrit/plugins/gitiles/RepositoryResolverAccessTest.java b/src/test/java/com/googlesource/gerrit/plugins/gitiles/RepositoryResolverAccessTest.java
new file mode 100644
index 0000000..31e4b47
--- /dev/null
+++ b/src/test/java/com/googlesource/gerrit/plugins/gitiles/RepositoryResolverAccessTest.java
@@ -0,0 +1,97 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.googlesource.gerrit.plugins.gitiles;
+
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.gerrit.acceptance.testsuite.project.TestProjectUpdate.allow;
+import static com.google.gerrit.server.group.SystemGroupBackend.ANONYMOUS_USERS;
+import static com.google.gerrit.testing.GerritJUnit.assertThrows;
+
+import com.google.gerrit.acceptance.LightweightPluginDaemonTest;
+import com.google.gerrit.acceptance.TestPlugin;
+import com.google.gerrit.acceptance.testsuite.project.ProjectOperations;
+import com.google.gerrit.acceptance.testsuite.request.RequestScopeOperations;
+import com.google.gerrit.common.data.Permission;
+import com.google.gerrit.entities.Project;
+import com.google.gerrit.extensions.api.projects.BranchInput;
+import com.google.gerrit.testing.ConfigSuite;
+import com.google.gerrit.util.http.testutil.FakeHttpServletRequest;
+import javax.inject.Inject;
+import org.eclipse.jgit.errors.RepositoryNotFoundException;
+import org.eclipse.jgit.lib.Config;
+import org.eclipse.jgit.lib.Repository;
+import org.junit.After;
+import org.junit.Test;
+
+@TestPlugin(name = "gitiles", sysModule = "com.googlesource.gerrit.plugins.gitiles.Module")
+public class RepositoryResolverAccessTest extends LightweightPluginDaemonTest {
+  @ConfigSuite.Default
+  public static Config defaultConfig() {
+    // Required config parameters to run Gitiles.
+    Config cfg = new Config();
+    cfg.setString("gerrit", null, "gitHttpUrl", "http://example.com/gitiles");
+    return cfg;
+  }
+
+  @Inject private RequestScopeOperations requestScopeOperations;
+  @Inject private ProjectOperations projectOperations;
+
+  @After
+  public void cleanUp() {
+    projectOperations.project(project).forUpdate().removeAllAccessSections().update();
+  }
+
+  @Test
+  public void resolveRepository_branchVisibilityIsRespected() throws Exception {
+    projectOperations.allProjectsForUpdate().removeAllAccessSections().update();
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(allow(Permission.READ).ref("refs/heads/visible").group(ANONYMOUS_USERS))
+        .add(allow(Permission.CREATE).ref("refs/*").group(ANONYMOUS_USERS))
+        .add(allow(Permission.PUSH).ref("refs/*").group(ANONYMOUS_USERS))
+        .update();
+    gApi.projects().name(project.get()).branch("refs/heads/visible").create(new BranchInput());
+    gApi.projects().name(project.get()).branch("refs/heads/invisible").create(new BranchInput());
+
+    Repository repo = resolver().open(new FakeHttpServletRequest(), project.get());
+    assertThat(repo.exactRef("refs/heads/visible")).isNotNull();
+    assertThat(repo.exactRef("refs/heads/invisible")).isNull();
+  }
+
+  @Test
+  public void resolveRepository_repositoryVisibilityIsRespected() throws Exception {
+    projectOperations.allProjectsForUpdate().removeAllAccessSections().update();
+    projectOperations.newProject().name("visible").create();
+    projectOperations.newProject().name("invisible").create();
+    projectOperations
+        .project(Project.nameKey("visible"))
+        .forUpdate()
+        .add(allow(Permission.READ).ref("refs/heads/master").group(ANONYMOUS_USERS))
+        .update();
+
+    requestScopeOperations.setApiUser(user.id());
+    assertThat(resolver().open(new FakeHttpServletRequest(), "visible")).isNotNull();
+    RepositoryNotFoundException ex =
+        assertThrows(
+            RepositoryNotFoundException.class,
+            () -> resolver().open(new FakeHttpServletRequest(), "invisible"));
+    assertThat(ex).hasMessageThat().contains("repository not found: invisible");
+  }
+
+  private Resolver resolver() {
+    return plugin.getSysInjector().getInstance(Resolver.class);
+  }
+}