Implement gnome-keyring for OSCrypt

components/os_crypt/key_storage_keyring.cc

+// Copyright 2016 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 "components/os_crypt/key_storage_keyring.h"
+
+#include <gnome-keyring.h>
+
+#include "base/base64.h"
+#include "base/bind.h"
+#include "base/rand_util.h"
+#include "base/single_thread_task_runner.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/synchronization/waitable_event.h"
+#include "base/threading/thread.h"
+#include "components/os_crypt/keyring_util_linux.h"
+
+namespace {
+
+#if defined(GOOGLE_CHROME_BUILD)
+const char kApplicationName[] = "chrome";
+#else
+const char kApplicationName[] = "chromium";
+#endif
+
+const GnomeKeyringPasswordSchema kSchema = {
+    GNOME_KEYRING_ITEM_GENERIC_SECRET,
+    {{"application", GNOME_KEYRING_ATTRIBUTE_TYPE_STRING}, {nullptr}}};
+
+}  // namespace
+
+KeyStorageKeyring::KeyStorageKeyring(
+    scoped_refptr<base::SingleThreadTaskRunner> main_thread_runner)
+    : main_thread_runner_(main_thread_runner) {}
+
+KeyStorageKeyring::~KeyStorageKeyring() {}
+
+bool KeyStorageKeyring::Init() {
+  return GnomeKeyringLoader::LoadGnomeKeyring();
+}
+
+std::string KeyStorageKeyring::GetKey() {
+  std::string password;
+
+  // Ensure GetKeyDelegate() is executed on the main thread.
+  if (main_thread_runner_->BelongsToCurrentThread()) {
+    GetKeyDelegate(&password, nullptr);
+  } else {
+    base::WaitableEvent password_loaded(
+        base::WaitableEvent::ResetPolicy::MANUAL,
+        base::WaitableEvent::InitialState::NOT_SIGNALED);
+    main_thread_runner_->PostTask(
+        FROM_HERE,
+        base::Bind(&KeyStorageKeyring::GetKeyDelegate, base::Unretained(this),
+                   &password, &password_loaded));
+    password_loaded.Wait();
+  }
+
+  return password;
+}
+
+void KeyStorageKeyring::GetKeyDelegate(
+    std::string* password_ptr,
+    base::WaitableEvent* password_loaded_ptr) {
+  gchar* password = nullptr;
+  GnomeKeyringResult result =
+      GnomeKeyringLoader::gnome_keyring_find_password_sync_ptr(
+          &kSchema, &password, "application", kApplicationName, nullptr);
+  if (result == GNOME_KEYRING_RESULT_OK) {
+    *password_ptr = password;
+    GnomeKeyringLoader::gnome_keyring_free_password_ptr(password);
+  } else if (result == GNOME_KEYRING_RESULT_NO_MATCH) {
+    *password_ptr = KeyStorageKeyring::AddRandomPasswordInKeyring();
+    VLOG(1) << "OSCrypt generated a new password";
+  } else {
+    password_ptr->clear();
+    VLOG(1) << "OSCrypt failed to use gnome-keyring";
+  }
+
+  if (password_loaded_ptr)
+    password_loaded_ptr->Signal();
+}
+
+std::string KeyStorageKeyring::AddRandomPasswordInKeyring() {
+  // Generate password
+  std::string password;
+  base::Base64Encode(base::RandBytesAsString(16), &password);
+
+  // Store generated password
+  GnomeKeyringResult result =
+      GnomeKeyringLoader::gnome_keyring_store_password_sync_ptr(
+          &kSchema, nullptr /* default keyring */, KeyStorageLinux::kKey,
+          password.c_str(), "application", kApplicationName, nullptr);
+  if (result != GNOME_KEYRING_RESULT_OK) {
+    VLOG(1) << "Failed to store generated password to gnome-keyring";
+    return std::string();
+  }
+
+  return password;
+}