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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 "chromeos/tpm/tpm_token_info_getter.h"
#include "base/bind.h"
#include "base/location.h"
#include "chromeos/dbus/cryptohome_client.h"
namespace {
const int64 kInitialRequestDelayMs = 100;
const int64 kMaxRequestDelayMs = 300000; // 5 minutes
// Calculates the delay before running next attempt to initiatialize the TPM
// token, if |last_delay| was the last or initial delay.
base::TimeDelta GetNextRequestDelayMs(base::TimeDelta last_delay) {
// This implements an exponential backoff, as we don't know in which order of
// magnitude the TPM token changes it's state.
base::TimeDelta next_delay = last_delay * 2;
// Cap the delay to prevent an overflow. This threshold is arbitrarily chosen.
const base::TimeDelta max_delay =
base::TimeDelta::FromMilliseconds(kMaxRequestDelayMs);
if (next_delay > max_delay)
next_delay = max_delay;
return next_delay;
}
} // namespace
namespace chromeos {
TPMTokenInfo::TPMTokenInfo()
: tpm_is_enabled(false),
token_slot_id(-1) {
}
TPMTokenInfo::~TPMTokenInfo() {}
// static
scoped_ptr<TPMTokenInfoGetter> TPMTokenInfoGetter::CreateForUserToken(
const std::string& user_id,
CryptohomeClient* cryptohome_client,
const scoped_refptr<base::TaskRunner>& delayed_task_runner) {
CHECK(!user_id.empty());
return scoped_ptr<TPMTokenInfoGetter>(
new TPMTokenInfoGetter(
TYPE_USER, user_id, cryptohome_client, delayed_task_runner));
}
// static
scoped_ptr<TPMTokenInfoGetter> TPMTokenInfoGetter::CreateForSystemToken(
CryptohomeClient* cryptohome_client,
const scoped_refptr<base::TaskRunner>& delayed_task_runner) {
return scoped_ptr<TPMTokenInfoGetter>(
new TPMTokenInfoGetter(
TYPE_SYSTEM, std::string(), cryptohome_client, delayed_task_runner));
}
TPMTokenInfoGetter::~TPMTokenInfoGetter() {}
void TPMTokenInfoGetter::Start(const TPMTokenInfoCallback& callback) {
CHECK(state_ == STATE_INITIAL);
CHECK(!callback.is_null());
callback_ = callback;
state_ = STATE_STARTED;
Continue();
}
TPMTokenInfoGetter::TPMTokenInfoGetter(
TPMTokenInfoGetter::Type type,
const std::string& user_id,
CryptohomeClient* cryptohome_client,
const scoped_refptr<base::TaskRunner>& delayed_task_runner)
: delayed_task_runner_(delayed_task_runner),
type_(type),
state_(TPMTokenInfoGetter::STATE_INITIAL),
user_id_(user_id),
tpm_request_delay_(
base::TimeDelta::FromMilliseconds(kInitialRequestDelayMs)),
cryptohome_client_(cryptohome_client),
weak_factory_(this) {
}
void TPMTokenInfoGetter::Continue() {
switch (state_) {
case STATE_INITIAL:
NOTREACHED();
break;
case STATE_STARTED:
cryptohome_client_->TpmIsEnabled(
base::Bind(&TPMTokenInfoGetter::OnTpmIsEnabled,
weak_factory_.GetWeakPtr()));
break;
case STATE_TPM_ENABLED:
if (type_ == TYPE_SYSTEM) {
cryptohome_client_->Pkcs11GetTpmTokenInfo(
base::Bind(&TPMTokenInfoGetter::OnPkcs11GetTpmTokenInfo,
weak_factory_.GetWeakPtr()));
} else { // if (type_ == TYPE_USER)
cryptohome_client_->Pkcs11GetTpmTokenInfoForUser(
user_id_,
base::Bind(&TPMTokenInfoGetter::OnPkcs11GetTpmTokenInfo,
weak_factory_.GetWeakPtr()));
}
break;
case STATE_DONE:
NOTREACHED();
}
}
void TPMTokenInfoGetter::RetryLater() {
delayed_task_runner_->PostDelayedTask(
FROM_HERE,
base::Bind(&TPMTokenInfoGetter::Continue, weak_factory_.GetWeakPtr()),
tpm_request_delay_);
tpm_request_delay_ = GetNextRequestDelayMs(tpm_request_delay_);
}
void TPMTokenInfoGetter::OnTpmIsEnabled(DBusMethodCallStatus call_status,
bool tpm_is_enabled) {
if (call_status != DBUS_METHOD_CALL_SUCCESS) {
RetryLater();
return;
}
if (!tpm_is_enabled) {
state_ = STATE_DONE;
callback_.Run(TPMTokenInfo());
return;
}
state_ = STATE_TPM_ENABLED;
Continue();
}
void TPMTokenInfoGetter::OnPkcs11GetTpmTokenInfo(
DBusMethodCallStatus call_status,
const std::string& token_name,
const std::string& user_pin,
int token_slot_id) {
if (call_status == DBUS_METHOD_CALL_FAILURE || token_slot_id == -1) {
RetryLater();
return;
}
state_ = STATE_DONE;
TPMTokenInfo token_info;
token_info.tpm_is_enabled = true;
token_info.token_name = token_name;
token_info.user_pin = user_pin;
token_info.token_slot_id = token_slot_id;
callback_.Run(token_info);
}
} // namespace chromeos
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