Add namespace sandbox class.

sandbox/linux/services/namespace_sandbox_unittest.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "sandbox/linux/services/namespace_sandbox.h"
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include <string>
+
+#include "base/command_line.h"
+#include "base/files/file_enumerator.h"
+#include "base/files/file_path.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/process/launch.h"
+#include "base/process/process.h"
+#include "base/test/multiprocess_test.h"
+#include "sandbox/linux/services/credentials.h"
+#include "sandbox/linux/services/namespace_utils.h"
+#include "sandbox/linux/tests/unit_tests.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/multiprocess_func_list.h"
+
+namespace sandbox {
+
+namespace {
+
+bool RootDirectoryIsEmpty() {
+  base::FilePath root("/");
+  int file_type =
+      base::FileEnumerator::DIRECTORIES | base::FileEnumerator::FILES;
+  base::FileEnumerator enumerator_before(root, false, file_type);
+  return enumerator_before.Next().empty();
+}
+
+class NamespaceSandboxTest : public base::MultiProcessTest {
+ public:
+  void TestProc(const std::string& procname) {
+    if (!Credentials::CanCreateProcessInNewUserNS()) {
+      return;
+    }
+
+    NamespaceSandbox namespace_sandbox;
+    namespace_sandbox.AddFdMapping(STDOUT_FILENO, STDOUT_FILENO);
+    namespace_sandbox.AddFdMapping(STDERR_FILENO, STDERR_FILENO);
+    base::Process process = namespace_sandbox.Launch(MakeCmdLine(procname));
+    ASSERT_TRUE(process.IsValid());
+
+    const int kDummyExitCode = 42;
+    int exit_code = kDummyExitCode;
+    EXPECT_TRUE(process.WaitForExit(&exit_code));
+    EXPECT_EQ(0, exit_code);
+  }
+};
+
+MULTIPROCESS_TEST_MAIN(SimpleChildProcess) {
+  scoped_ptr<base::Environment> env(base::Environment::Create());
+  bool in_user_ns = NamespaceSandbox::InNewUserNamespace();
+  bool in_pid_ns = NamespaceSandbox::InNewPidNamespace();
+  bool in_net_ns = NamespaceSandbox::InNewNetNamespace();
+  CHECK(in_user_ns);
+  CHECK_EQ(in_pid_ns,
+           NamespaceUtils::KernelSupportsUnprivilegedNamespace(CLONE_NEWPID));
+  CHECK_EQ(in_net_ns,
+           NamespaceUtils::KernelSupportsUnprivilegedNamespace(CLONE_NEWNET));
+  if (in_pid_ns) {
+    CHECK_EQ(1, getpid());
+  }
+  return 0;
+}
+
+TEST_F(NamespaceSandboxTest, BasicUsage) {
+  TestProc("SimpleChildProcess");
+}
+
+MULTIPROCESS_TEST_MAIN(ChrootMe) {
+  CHECK(!RootDirectoryIsEmpty());
+  CHECK(sandbox::Credentials::MoveToNewUserNS());
+  CHECK(sandbox::Credentials::DropFileSystemAccess());
+  CHECK(RootDirectoryIsEmpty());
+  return 0;
+}
+
+TEST_F(NamespaceSandboxTest, ChrootAndDropCapabilities) {
+  TestProc("ChrootMe");
+}
+
+}  // namespace
+
+}  // namespace sandbox