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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/logging.h"
#include "chrome/browser/extensions/api/screenlock_private/screenlock_private_api.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/signin/screenlock_bridge.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;
}
} // namespace
EasyUnlockAuthAttempt::EasyUnlockAuthAttempt(Profile* profile,
const std::string& user_id,
Type type)
: profile_(profile),
state_(STATE_IDLE),
user_id_(user_id),
type_(type) {
}
EasyUnlockAuthAttempt::~EasyUnlockAuthAttempt() {
if (state_ == STATE_RUNNING)
Cancel(user_id_);
}
bool EasyUnlockAuthAttempt::Start(const std::string& user_id) {
DCHECK(state_ == STATE_IDLE);
if (!ScreenlockBridge::Get()->IsLocked())
return false;
if (user_id != user_id_) {
Cancel(user_id);
return false;
}
ScreenlockBridge::LockHandler::AuthType auth_type =
ScreenlockBridge::Get()->lock_handler()->GetAuthType(user_id);
if (auth_type != ScreenlockBridge::LockHandler::USER_CLICK) {
Cancel(user_id);
return false;
}
state_ = STATE_RUNNING;
// TODO(tbarzic): Replace this with an easyUnlockPrivate event that will
// report more context to the app (e.g. user id, whether the attempt is for
// signin or unlock).
extensions::ScreenlockPrivateEventRouter* router =
extensions::ScreenlockPrivateEventRouter::GetFactoryInstance()->Get(
profile_);
return router->OnAuthAttempted(auth_type, "");
}
void EasyUnlockAuthAttempt::FinalizeUnlock(const std::string& user_id,
bool success) {
if (state_ != STATE_RUNNING || user_id != user_id_)
return;
if (type_ != TYPE_UNLOCK) {
Cancel(user_id_);
return;
}
if (!ScreenlockBridge::Get()->IsLocked())
return;
if (success) {
ScreenlockBridge::Get()->lock_handler()->Unlock(user_id_);
} else {
ScreenlockBridge::Get()->lock_handler()->EnableInput();
}
state_ = STATE_DONE;
}
void EasyUnlockAuthAttempt::FinalizeSignin(const std::string& user_id,
const std::string& wrapped_secret,
const std::string& raw_session_key) {
if (state_ != STATE_RUNNING || user_id != user_id_)
return;
if (type_ != TYPE_SIGNIN) {
Cancel(user_id_);
return;
}
if (!ScreenlockBridge::Get()->IsLocked())
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)
ScreenlockBridge::Get()->lock_handler()->AttemptEasySignin(
user_id,
unwrapped_secret,
key_label);
state_ = STATE_DONE;
}
void EasyUnlockAuthAttempt::Cancel(const std::string& user_id) {
if (type_ == TYPE_UNLOCK)
FinalizeUnlock(user_id, false);
else
FinalizeSignin(user_id, "", "");
state_ = STATE_DONE;
}
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