keepassxc

KeePass2Writer.cpp
196 строк · 6.1 Кб
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/*
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 *  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
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 *
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 *  This program is free software: you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation, either version 2 or (at your option)
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 *  version 3 of the License.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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#include <QFile>
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#include "core/Group.h"
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#include "core/Metadata.h"
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#include "format/Kdbx3Writer.h"
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#include "format/Kdbx4Writer.h"
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#include "format/KeePass2Writer.h"
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/**
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 * Write a database to a KDBX file.
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 *
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 * @param filename output filename
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 * @param db source database
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 * @return true on success
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 */
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bool KeePass2Writer::writeDatabase(const QString& filename, Database* db)
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{
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    QFile file(filename);
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    if (!file.open(QIODevice::WriteOnly | QIODevice::Truncate)) {
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        raiseError(file.errorString());
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        return false;
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    }
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    return writeDatabase(&file, db);
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}
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#define VERSION_MAX(a, b)                                                                                              \
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    a = qMax(a, b);                                                                                                    \
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    if (a >= KeePass2::FILE_VERSION_MAX) {                                                                             \
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        return a;                                                                                                      \
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    }
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/**
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 * Get the minimum KDBX version required for writing the database.
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 */
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quint32 KeePass2Writer::kdbxVersionRequired(Database const* db, bool ignoreCurrent, bool ignoreKdf)
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{
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    quint32 version = KeePass2::FILE_VERSION_3_1;
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    if (!ignoreCurrent) {
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        VERSION_MAX(version, db->formatVersion())
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    }
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    if (!ignoreKdf && !db->kdf().isNull() && !db->kdf()->uuid().isNull()
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        && db->kdf()->uuid() != KeePass2::KDF_AES_KDBX3) {
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        VERSION_MAX(version, KeePass2::FILE_VERSION_4)
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    }
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    if (!db->publicCustomData().isEmpty()) {
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        VERSION_MAX(version, KeePass2::FILE_VERSION_4)
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    }
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    for (const auto* group : db->rootGroup()->groupsRecursive(true)) {
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        if (group->customData() && !group->customData()->isEmpty()) {
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            VERSION_MAX(version, KeePass2::FILE_VERSION_4)
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        }
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        if (!group->tags().isEmpty()) {
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            VERSION_MAX(version, KeePass2::FILE_VERSION_4_1)
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        }
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        if (group->previousParentGroup()) {
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            VERSION_MAX(version, KeePass2::FILE_VERSION_4_1)
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        }
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        for (const auto* entry : group->entries()) {
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            if (entry->customData() && !entry->customData()->isEmpty()) {
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                VERSION_MAX(version, KeePass2::FILE_VERSION_4)
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            }
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            if (entry->excludeFromReports()) {
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                VERSION_MAX(version, KeePass2::FILE_VERSION_4_1)
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            }
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            if (entry->previousParentGroup()) {
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                VERSION_MAX(version, KeePass2::FILE_VERSION_4_1)
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            }
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            for (const auto* historyItem : entry->historyItems()) {
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                if (historyItem->customData() && !historyItem->customData()->isEmpty()) {
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                    VERSION_MAX(version, KeePass2::FILE_VERSION_4)
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                }
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            }
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        }
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    }
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    const QList<QUuid> customIconsOrder = db->metadata()->customIconsOrder();
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    for (const QUuid& uuid : customIconsOrder) {
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        const auto& icon = db->metadata()->customIcon(uuid);
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        if (!icon.name.isEmpty() || icon.lastModified.isValid()) {
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            VERSION_MAX(version, KeePass2::FILE_VERSION_4_1)
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        }
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    }
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    return version;
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}
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/**
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 * Write a database to a device in KDBX format.
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 *
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 * @param device output device
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 * @param db source database
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 * @return true on success
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 */
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bool KeePass2Writer::writeDatabase(QIODevice* device, Database* db)
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{
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    m_error = false;
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    m_errorStr.clear();
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    m_version = kdbxVersionRequired(db);
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    if (db->kdf()->uuid() == KeePass2::KDF_AES_KDBX3 && m_version >= KeePass2::FILE_VERSION_4) {
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        // We MUST re-transform the key, because challenge-response hashing has changed in KDBX 4.
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        // If we forget to re-transform, the database will be saved WITHOUT a challenge-response key component!
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        auto kdf = KeePass2::uuidToKdf(KeePass2::KDF_AES_KDBX4);
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        kdf->setRounds(db->kdf()->rounds());
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        db->changeKdf(kdf);
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    }
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    db->setFormatVersion(m_version);
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    if (db->kdf()->uuid() == KeePass2::KDF_AES_KDBX3) {
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        Q_ASSERT(m_version <= KeePass2::FILE_VERSION_3_1);
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        m_writer.reset(new Kdbx3Writer());
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    } else {
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        Q_ASSERT(m_version >= KeePass2::FILE_VERSION_4);
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        m_writer.reset(new Kdbx4Writer());
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    }
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    return m_writer->writeDatabase(device, db);
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}
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void KeePass2Writer::extractDatabase(Database* db, QByteArray& xmlOutput)
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{
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    m_error = false;
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    m_errorStr.clear();
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    m_version = kdbxVersionRequired(db);
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    db->setFormatVersion(m_version);
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    if (db->kdf()->uuid() == KeePass2::KDF_AES_KDBX3) {
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        Q_ASSERT(m_version <= KeePass2::FILE_VERSION_3_1);
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        m_writer.reset(new Kdbx3Writer());
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    } else {
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        Q_ASSERT(m_version >= KeePass2::FILE_VERSION_4);
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        m_writer.reset(new Kdbx4Writer());
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    }
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    m_writer->extractDatabase(xmlOutput, db);
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}
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bool KeePass2Writer::hasError() const
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{
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    return m_error || (m_writer && m_writer->hasError());
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}
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QString KeePass2Writer::errorString() const
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{
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    return m_writer ? m_writer->errorString() : m_errorStr;
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}
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/**
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 * Raise an error. Use in case of an unexpected write error.
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 *
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 * @param errorMessage error message
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 */
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void KeePass2Writer::raiseError(const QString& errorMessage)
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{
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    m_error = true;
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    m_errorStr = errorMessage;
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}
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/**
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 * @return KDBX writer used for writing the output file
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 */
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QSharedPointer<KdbxWriter> KeePass2Writer::writer() const
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{
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    return {};
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}
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/**
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 * @return KDBX version used for writing the output file
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 */
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quint32 KeePass2Writer::version() const
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{
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    return m_version;
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}
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