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/*
* Copyright (C) 2016 Felix Geyer <debfx@fobos.de>
* Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 or (at your option)
* version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "KeePass2Repair.h"
#include <QBuffer>
#include "core/Group.h"
#include "format/KeePass2.h"
#include "format/KeePass2RandomStream.h"
#include "format/KeePass2Reader.h"
#include "format/Kdbx4Reader.h"
#include "format/KdbxXmlReader.h"
KeePass2Repair::RepairOutcome KeePass2Repair::repairDatabase(QIODevice* device, const CompositeKey& key)
{
m_errorStr.clear();
KeePass2Reader reader;
reader.setSaveXml(true);
QScopedPointer<Database> db(reader.readDatabase(device, key, true));
if (!reader.hasError()) {
return qMakePair(NothingTodo, nullptr);
}
QByteArray xmlData = reader.reader()->xmlData();
if (!db || xmlData.isEmpty()) {
m_errorStr = reader.errorString();
return qMakePair(UnableToOpen, nullptr);
}
bool repairAction = false;
QString xmlStart = QString::fromLatin1(xmlData.constData(), qMin(100, xmlData.size()));
QRegExp encodingRegExp("encoding=\"([^\"]+)\"", Qt::CaseInsensitive, QRegExp::RegExp2);
if (encodingRegExp.indexIn(xmlStart) != -1) {
if (encodingRegExp.cap(1).compare("utf-8", Qt::CaseInsensitive) != 0
&& encodingRegExp.cap(1).compare("utf8", Qt::CaseInsensitive) != 0)
{
// database is not utf-8 encoded, we don't support repairing that
return qMakePair(RepairFailed, nullptr);
}
}
// try to fix broken databases because of bug #392
for (int i = (xmlData.size() - 1); i >= 0; i--) {
auto ch = static_cast<quint8>(xmlData.at(i));
if (ch < 0x20 && ch != 0x09 && ch != 0x0A && ch != 0x0D) {
xmlData.remove(i, 1);
repairAction = true;
}
}
if (!repairAction) {
// we were unable to find the problem
return qMakePair(RepairFailed, nullptr);
}
KeePass2RandomStream randomStream(reader.reader()->protectedStreamAlgo());
randomStream.init(reader.reader()->streamKey());
bool hasError;
QBuffer buffer(&xmlData);
buffer.open(QIODevice::ReadOnly);
if ((reader.version() & KeePass2::FILE_VERSION_CRITICAL_MASK) < KeePass2::FILE_VERSION_4) {
KdbxXmlReader xmlReader(KeePass2::FILE_VERSION_3_1);
xmlReader.readDatabase(&buffer, db.data(), &randomStream);
hasError = xmlReader.hasError();
} else {
auto reader4 = reader.reader().staticCast<Kdbx4Reader>();
QHash<QString, QByteArray> pool = reader4->binaryPool();
KdbxXmlReader xmlReader(KeePass2::FILE_VERSION_4, pool);
xmlReader.readDatabase(&buffer, db.data(), &randomStream);
hasError = xmlReader.hasError();
}
if (hasError) {
return qMakePair(RepairFailed, nullptr);
}
else {
return qMakePair(RepairSuccess, db.take());
}
}
QString KeePass2Repair::errorString() const
{
return m_errorStr;
}
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