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// Copyright 2014 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 "chrome/browser/signin/easy_unlock_auth_attempt.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "build/build_config.h"
#include "chrome/browser/signin/easy_unlock_app_manager.h"
#include "components/proximity_auth/screenlock_bridge.h"
#include "components/proximity_auth/switches.h"
#include "crypto/encryptor.h"
#include "crypto/symmetric_key.h"
#if defined(OS_CHROMEOS)
#include "chrome/browser/chromeos/login/easy_unlock/easy_unlock_key_manager.h"
#endif
namespace {
// Decrypts the secret that should be used to login from |wrapped_secret| using
// raw AES key |raw_key|.
// In a case of error, an empty string is returned.
std::string UnwrapSecret(const std::string& wrapped_secret,
const std::string& raw_key) {
if (raw_key.empty())
return std::string();
// Import the key structure.
scoped_ptr<crypto::SymmetricKey> key(
crypto::SymmetricKey::Import(crypto::SymmetricKey::AES, raw_key));
if (!key)
return std::string();
std::string iv(raw_key.size(), ' ');
crypto::Encryptor encryptor;
if (!encryptor.Init(key.get(), crypto::Encryptor::CBC, iv))
return std::string();
std::string secret;
if (!encryptor.Decrypt(wrapped_secret, &secret))
return std::string();
return secret;
}
void DefaultAuthAttemptFinalizedHandler(
EasyUnlockAuthAttempt::Type auth_attempt_type,
bool success,
const AccountId& account_id,
const std::string& key_secret,
const std::string& key_label) {
if (!proximity_auth::ScreenlockBridge::Get()->IsLocked())
return;
switch (auth_attempt_type) {
case EasyUnlockAuthAttempt::TYPE_UNLOCK:
if (success) {
proximity_auth::ScreenlockBridge::Get()->lock_handler()->Unlock(
account_id);
} else {
proximity_auth::ScreenlockBridge::Get()->lock_handler()->EnableInput();
}
return;
case EasyUnlockAuthAttempt::TYPE_SIGNIN:
if (success) {
proximity_auth::ScreenlockBridge::Get()
->lock_handler()
->AttemptEasySignin(account_id, key_secret, key_label);
} else {
// Attempting signin with an empty secret is equivalent to canceling the
// attempt.
proximity_auth::ScreenlockBridge::Get()
->lock_handler()
->AttemptEasySignin(account_id, std::string(), std::string());
}
return;
}
}
} // namespace
EasyUnlockAuthAttempt::EasyUnlockAuthAttempt(
EasyUnlockAppManager* app_manager,
const AccountId& account_id,
Type type,
const FinalizedCallback& finalized_callback)
: app_manager_(app_manager),
state_(STATE_IDLE),
account_id_(account_id),
type_(type),
finalized_callback_(finalized_callback) {
if (finalized_callback_.is_null())
finalized_callback_ = base::Bind(&DefaultAuthAttemptFinalizedHandler);
}
EasyUnlockAuthAttempt::~EasyUnlockAuthAttempt() {
if (state_ == STATE_RUNNING)
Cancel(account_id_);
}
bool EasyUnlockAuthAttempt::Start() {
DCHECK_EQ(STATE_IDLE, state_);
if (!proximity_auth::ScreenlockBridge::Get()->IsLocked())
return false;
proximity_auth::ScreenlockBridge::LockHandler::AuthType auth_type =
proximity_auth::ScreenlockBridge::Get()->lock_handler()->GetAuthType(
account_id_);
if (auth_type != proximity_auth::ScreenlockBridge::LockHandler::USER_CLICK) {
Cancel(account_id_);
return false;
}
state_ = STATE_RUNNING;
// We need this workaround for ProximityAuthSystem, since we don't load the
// full background app anymore. The call to
// |app_manager_->SendAuthAttemptEvent()| returns false, as there is no
// observer registered for the |screenlock::OnAuthAttempted| event. As a
// result, the auth attempt will always fail.
// TODO(sacomoto): Clean this up when the background app is not needed
// anymore.
if (!app_manager_->SendAuthAttemptEvent() &&
!base::CommandLine::ForCurrentProcess()->HasSwitch(
proximity_auth::switches::kEnableBluetoothLowEnergyDiscovery)) {
Cancel(account_id_);
return false;
}
return true;
}
void EasyUnlockAuthAttempt::FinalizeUnlock(const AccountId& account_id,
bool success) {
if (state_ != STATE_RUNNING || account_id != account_id_)
return;
if (!proximity_auth::ScreenlockBridge::Get()->IsLocked())
return;
if (type_ != TYPE_UNLOCK) {
Cancel(account_id_);
return;
}
finalized_callback_.Run(type_, success, account_id, std::string(),
std::string());
state_ = STATE_DONE;
}
void EasyUnlockAuthAttempt::FinalizeSignin(const AccountId& account_id,
const std::string& wrapped_secret,
const std::string& raw_session_key) {
if (state_ != STATE_RUNNING || account_id != account_id_)
return;
if (!proximity_auth::ScreenlockBridge::Get()->IsLocked())
return;
if (type_ != TYPE_SIGNIN) {
Cancel(account_id_);
return;
}
if (wrapped_secret.empty()) {
Cancel(account_id_);
return;
}
std::string unwrapped_secret = UnwrapSecret(wrapped_secret, raw_session_key);
std::string key_label;
#if defined(OS_CHROMEOS)
key_label = chromeos::EasyUnlockKeyManager::GetKeyLabel(0u);
#endif // defined(OS_CHROMEOS)
const bool kSuccess = true;
finalized_callback_.Run(type_, kSuccess, account_id, unwrapped_secret,
key_label);
state_ = STATE_DONE;
}
void EasyUnlockAuthAttempt::Cancel(const AccountId& account_id) {
state_ = STATE_DONE;
const bool kFailure = false;
finalized_callback_.Run(type_, kFailure, account_id, std::string(),
std::string());
}
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