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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/chromeos/platform_keys/platform_keys_service.h"
#include "base/base64.h"
#include "base/callback.h"
#include "base/values.h"
#include "chrome/browser/chromeos/platform_keys/platform_keys.h"
#include "content/public/browser/browser_thread.h"
#include "extensions/browser/state_store.h"
using content::BrowserThread;
namespace chromeos {
namespace {
const char kErrorInternal[] = "Internal Error.";
const char kErrorKeyNotAllowedForSigning[] =
"This key is not allowed for signing. Either it was used for signing "
"before or it was not correctly generated.";
const char kStateStorePlatformKeys[] = "PlatformKeys";
scoped_ptr<base::StringValue> GetPublicKeyValue(
const std::string& public_key_spki_der) {
std::string public_key_spki_der_b64;
base::Base64Encode(public_key_spki_der, &public_key_spki_der_b64);
return make_scoped_ptr(new base::StringValue(public_key_spki_der_b64));
}
// Wraps |callback| into a void(bool) callback which forwards
// |public_key_spki_der| if |true| is passed to it.
void WrapGenerateKeyCallback(
const PlatformKeysService::GenerateKeyCallback& callback,
const std::string& public_key_spki_der,
bool success) {
if (success)
callback.Run(public_key_spki_der, std::string() /* no error */);
else
callback.Run(std::string() /* no public key */, kErrorInternal);
}
// Callback used by |PlatformKeysService::Sign|.
// Is called with the old validity of |public_key_spki_der| (or false if an
// error occurred during reading the StateStore). If allowed, starts the actual
// signing operation which will call back |callback|. If not allowed, calls
// |callback| with an error.
void CheckValidityAndSign(const std::string& token_id,
const std::string& public_key_spki_der,
platform_keys::HashAlgorithm hash_algorithm,
const std::string& data,
const PlatformKeysService::SignCallback& callback,
content::BrowserContext* browser_context,
bool key_is_valid) {
if (!key_is_valid) {
callback.Run(std::string() /* no signature */,
kErrorKeyNotAllowedForSigning);
return;
}
platform_keys::subtle::Sign(token_id,
public_key_spki_der,
hash_algorithm,
data,
callback,
browser_context);
}
} // namespace
PlatformKeysService::PlatformKeysService(
content::BrowserContext* browser_context,
extensions::StateStore* state_store)
: browser_context_(browser_context),
state_store_(state_store),
weak_factory_(this) {
DCHECK(state_store);
}
PlatformKeysService::~PlatformKeysService() {
}
void PlatformKeysService::GenerateRSAKey(const std::string& token_id,
unsigned int modulus_length,
const std::string& extension_id,
const GenerateKeyCallback& callback) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
platform_keys::subtle::GenerateRSAKey(
token_id,
modulus_length,
base::Bind(&PlatformKeysService::GenerateRSAKeyCallback,
weak_factory_.GetWeakPtr(),
extension_id,
callback),
browser_context_);
}
void PlatformKeysService::Sign(const std::string& token_id,
const std::string& public_key_spki_der,
platform_keys::HashAlgorithm hash_algorithm,
const std::string& data,
const std::string& extension_id,
const SignCallback& callback) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
ReadValidityAndInvalidateKey(extension_id,
public_key_spki_der,
base::Bind(&CheckValidityAndSign,
token_id,
public_key_spki_der,
hash_algorithm,
data,
callback,
browser_context_));
}
void PlatformKeysService::RegisterPublicKey(
const std::string& extension_id,
const std::string& public_key_spki_der,
const base::Callback<void(bool)>& callback) {
GetPlatformKeysOfExtension(
extension_id,
base::Bind(&PlatformKeysService::RegisterPublicKeyGotPlatformKeys,
weak_factory_.GetWeakPtr(),
extension_id,
public_key_spki_der,
callback));
}
void PlatformKeysService::ReadValidityAndInvalidateKey(
const std::string& extension_id,
const std::string& public_key_spki_der,
const base::Callback<void(bool)>& callback) {
GetPlatformKeysOfExtension(extension_id,
base::Bind(&PlatformKeysService::InvalidateKey,
weak_factory_.GetWeakPtr(),
extension_id,
public_key_spki_der,
callback));
}
void PlatformKeysService::GetPlatformKeysOfExtension(
const std::string& extension_id,
const GetPlatformKeysCallback& callback) {
state_store_->GetExtensionValue(
extension_id,
kStateStorePlatformKeys,
base::Bind(&PlatformKeysService::GotPlatformKeysOfExtension,
weak_factory_.GetWeakPtr(),
extension_id,
callback));
}
void PlatformKeysService::GenerateRSAKeyCallback(
const std::string& extension_id,
const GenerateKeyCallback& callback,
const std::string& public_key_spki_der,
const std::string& error_message) {
if (!error_message.empty()) {
callback.Run(std::string() /* no public key */, error_message);
return;
}
base::Callback<void(bool)> wrapped_callback(
base::Bind(&WrapGenerateKeyCallback, callback, public_key_spki_der));
RegisterPublicKey(extension_id, public_key_spki_der, wrapped_callback);
}
void PlatformKeysService::RegisterPublicKeyGotPlatformKeys(
const std::string& extension_id,
const std::string& public_key_spki_der,
const base::Callback<void(bool)>& callback,
scoped_ptr<base::ListValue> platform_keys) {
if (!platform_keys) {
LOG(ERROR) << "Error while reading the platform keys.";
callback.Run(false);
return;
}
scoped_ptr<base::StringValue> key_value(
GetPublicKeyValue(public_key_spki_der));
DCHECK(platform_keys->end() == platform_keys->Find(*key_value))
<< "Keys are assumed to be generated and not to be registered multiple "
"times.";
platform_keys->Append(key_value.release());
state_store_->SetExtensionValue(
extension_id, kStateStorePlatformKeys, platform_keys.Pass());
callback.Run(true);
}
void PlatformKeysService::InvalidateKey(
const std::string& extension_id,
const std::string& public_key_spki_der,
const base::Callback<void(bool)>& callback,
scoped_ptr<base::ListValue> platform_keys) {
scoped_ptr<base::StringValue> key_value(
GetPublicKeyValue(public_key_spki_der));
size_t index = 0;
if (!platform_keys->Remove(*key_value, &index)) {
// The key is not found, so it's not valid to use it for signing.
callback.Run(false);
return;
}
state_store_->SetExtensionValue(
extension_id, kStateStorePlatformKeys, platform_keys.Pass());
callback.Run(true);
}
void PlatformKeysService::GotPlatformKeysOfExtension(
const std::string& extension_id,
const GetPlatformKeysCallback& callback,
scoped_ptr<base::Value> value) {
if (!value)
value.reset(new base::ListValue);
base::ListValue* keys = NULL;
if (!value->GetAsList(&keys)) {
LOG(ERROR) << "Found a value of wrong type.";
value.reset();
}
ignore_result(value.release());
callback.Run(make_scoped_ptr(keys));
}
} // namespace chromeos
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