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// Copyright (c) 2011 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/sync/syncable/nigori_util.h"
#include <queue>
#include <string>
#include <vector>
#include "chrome/browser/sync/engine/syncer_util.h"
#include "chrome/browser/sync/syncable/syncable.h"
#include "chrome/browser/sync/util/cryptographer.h"
namespace syncable {
ModelTypeSet GetEncryptedDataTypes(BaseTransaction* const trans) {
std::string nigori_tag = ModelTypeToRootTag(syncable::NIGORI);
Entry entry(trans, GET_BY_SERVER_TAG, nigori_tag);
if (!entry.good()) {
VLOG(1) << "Nigori node not found, assuming no encrypted datatypes.";
return ModelTypeSet();
}
if (NIGORI != entry.GetModelType()) {
// Can happen if we fail to apply the nigori node due to a conflict.
VLOG(1) << "Nigori node does not have nigori extension. Assuming no"
<< " encrypted datatypes.";
return ModelTypeSet();
}
const sync_pb::EntitySpecifics& specifics = entry.Get(SPECIFICS);
return GetEncryptedDataTypesFromNigori(
specifics.GetExtension(sync_pb::nigori));
}
ModelTypeSet GetEncryptedDataTypesFromNigori(
const sync_pb::NigoriSpecifics& nigori) {
// We don't check NIGORI datatype, it uses its own encryption scheme.
ModelTypeSet encrypted_types;
if (nigori.encrypt_bookmarks())
encrypted_types.insert(BOOKMARKS);
if (nigori.encrypt_preferences())
encrypted_types.insert(PREFERENCES);
if (nigori.encrypt_autofill_profile())
encrypted_types.insert(AUTOFILL_PROFILE);
if (nigori.encrypt_autofill())
encrypted_types.insert(AUTOFILL);
if (nigori.encrypt_themes())
encrypted_types.insert(THEMES);
if (nigori.encrypt_typed_urls())
encrypted_types.insert(TYPED_URLS);
if (nigori.encrypt_extensions())
encrypted_types.insert(EXTENSIONS);
if (nigori.encrypt_sessions())
encrypted_types.insert(SESSIONS);
if (nigori.encrypt_apps())
encrypted_types.insert(APPS);
return encrypted_types;
}
void FillNigoriEncryptedTypes(const ModelTypeSet& types,
sync_pb::NigoriSpecifics* nigori) {
DCHECK(nigori);
nigori->set_encrypt_bookmarks(types.count(BOOKMARKS) > 0);
nigori->set_encrypt_preferences(types.count(PREFERENCES) > 0);
nigori->set_encrypt_autofill_profile(types.count(AUTOFILL_PROFILE) > 0);
nigori->set_encrypt_autofill(types.count(AUTOFILL) > 0);
nigori->set_encrypt_themes(types.count(THEMES) > 0);
nigori->set_encrypt_typed_urls(types.count(TYPED_URLS) > 0);
nigori->set_encrypt_extensions(types.count(EXTENSIONS) > 0);
nigori->set_encrypt_sessions(types.count(SESSIONS) > 0);
nigori->set_encrypt_apps(types.count(APPS) > 0);
}
bool ProcessUnsyncedChangesForEncryption(
WriteTransaction* const trans,
const ModelTypeSet& encrypted_types,
browser_sync::Cryptographer* cryptographer) {
// Get list of all datatypes with unsynced changes. It's possible that our
// local changes need to be encrypted if encryption for that datatype was
// just turned on (and vice versa). This should never affect passwords.
std::vector<int64> handles;
browser_sync::SyncerUtil::GetUnsyncedEntries(trans, &handles);
for (size_t i = 0; i < handles.size(); ++i) {
MutableEntry entry(trans, GET_BY_HANDLE, handles[i]);
sync_pb::EntitySpecifics new_specifics;
const sync_pb::EntitySpecifics& entry_specifics = entry.Get(SPECIFICS);
ModelType type = entry.GetModelType();
if (type == PASSWORDS)
continue;
if (encrypted_types.count(type) > 0 &&
!entry_specifics.has_encrypted()) {
// This entry now requires encryption.
AddDefaultExtensionValue(type, &new_specifics);
if (!cryptographer->Encrypt(
entry_specifics,
new_specifics.mutable_encrypted())) {
LOG(ERROR) << "Could not encrypt data for newly encrypted type " <<
ModelTypeToString(type);
NOTREACHED();
return false;
} else {
VLOG(1) << "Encrypted change for newly encrypted type " <<
ModelTypeToString(type);
entry.Put(SPECIFICS, new_specifics);
}
} else if (encrypted_types.count(type) == 0 &&
entry_specifics.has_encrypted()) {
// This entry no longer requires encryption.
if (!cryptographer->Decrypt(entry_specifics.encrypted(),
&new_specifics)) {
LOG(ERROR) << "Could not decrypt data for newly unencrypted type " <<
ModelTypeToString(type);
NOTREACHED();
return false;
} else {
VLOG(1) << "Decrypted change for newly unencrypted type " <<
ModelTypeToString(type);
entry.Put(SPECIFICS, new_specifics);
}
}
}
return true;
}
bool VerifyUnsyncedChangesAreEncrypted(
BaseTransaction* const trans,
const ModelTypeSet& encrypted_types) {
std::vector<int64> handles;
browser_sync::SyncerUtil::GetUnsyncedEntries(trans, &handles);
for (size_t i = 0; i < handles.size(); ++i) {
Entry entry(trans, GET_BY_HANDLE, handles[i]);
if (!entry.good()) {
NOTREACHED();
return false;
}
const sync_pb::EntitySpecifics& entry_specifics = entry.Get(SPECIFICS);
ModelType type = entry.GetModelType();
if (type == PASSWORDS)
continue;
if (encrypted_types.count(type) > 0 &&
!entry_specifics.has_encrypted()) {
// This datatype requires encryption but this data is not encrypted.
return false;
}
}
return true;
}
// Mainly for testing.
bool VerifyDataTypeEncryption(BaseTransaction* const trans,
ModelType type,
bool is_encrypted) {
if (type == PASSWORDS || type == NIGORI) {
NOTREACHED();
return true;
}
std::string type_tag = ModelTypeToRootTag(type);
Entry type_root(trans, GET_BY_SERVER_TAG, type_tag);
if (!type_root.good()) {
NOTREACHED();
return false;
}
std::queue<Id> to_visit;
Id id_string =
trans->directory()->GetFirstChildId(trans, type_root.Get(ID));
to_visit.push(id_string);
while (!to_visit.empty()) {
id_string = to_visit.front();
to_visit.pop();
if (id_string.IsRoot())
continue;
Entry child(trans, GET_BY_ID, id_string);
if (!child.good()) {
NOTREACHED();
return false;
}
if (child.Get(IS_DIR)) {
// Traverse the children.
to_visit.push(
trans->directory()->GetFirstChildId(trans, child.Get(ID)));
} else {
const sync_pb::EntitySpecifics& specifics = child.Get(SPECIFICS);
DCHECK_EQ(type, child.GetModelType());
DCHECK_EQ(type, GetModelTypeFromSpecifics(specifics));
if (specifics.has_encrypted() != is_encrypted)
return false;
}
// Push the successor.
to_visit.push(child.Get(NEXT_ID));
}
return true;
}
} // namespace syncable
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