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// Copyright (C) 2021 The Qt Company Ltd.
// Copyright (C) 2019 Luxoft Sweden AB
// Copyright (C) 2018 Pelagicore AG
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include <QDebug>
#include <QFileInfo>
#include <QDBusConnection>
#include <QDBusConnectionInterface>
#include <QDBusMessage>
#include <QDBusContext>
#include <QDBusAbstractAdaptor>
#include <QMetaMethod>
#include <algorithm>
#include "utilities.h"
#include "dbuspolicy.h"
#include "applicationmanager.h"
QT_BEGIN_NAMESPACE_AM
struct DBusPolicyEntry
{
QList<uint> m_uids;
QStringList m_executables;
QStringList m_capabilities;
};
static QHash<QDBusAbstractAdaptor *, QMap<QByteArray, DBusPolicyEntry>> &policies()
{
static QHash<QDBusAbstractAdaptor *, QMap<QByteArray, DBusPolicyEntry>> hash;
return hash;
}
bool DBusPolicy::add(QDBusAbstractAdaptor *dbusAdaptor, const QVariantMap &yamlFragment)
{
QMap<QByteArray, DBusPolicyEntry> result;
const QMetaObject *mo = dbusAdaptor->metaObject();
for (auto it = yamlFragment.cbegin(); it != yamlFragment.cend(); ++it) {
const QByteArray func = it.key().toLocal8Bit();
bool found = false;
for (int mi = mo->methodOffset(); mi < mo->methodCount(); ++mi) {
if (mo->method(mi).name() == func) {
found = true;
break;
}
}
if (!found)
return false;
const QVariantMap &policy = it->toMap();
DBusPolicyEntry dbp;
bool ok;
const QVariantList uidList = policy.value(qSL("uids")).toList();
for (const QVariant &v : uidList) {
uint uid = v.toUInt(&ok);
if (ok)
dbp.m_uids << uid;
}
std::sort(dbp.m_uids.begin(), dbp.m_uids.end());
dbp.m_executables = variantToStringList(policy.value(qSL("executables")));
dbp.m_executables.sort();
dbp.m_capabilities = variantToStringList(policy.value(qSL("capabilities")));
dbp.m_capabilities.sort();
result.insert(func, dbp);
}
policies().insert(dbusAdaptor, result);
return true;
}
bool DBusPolicy::check(QDBusAbstractAdaptor *dbusAdaptor, const QByteArray &function)
{
#if !defined(Q_OS_UNIX)
Q_UNUSED(dbusAdaptor)
Q_UNUSED(function)
return true;
#else
if (!dbusAdaptor)
return false;
QObject *realObject = dbusAdaptor->parent();
if (!realObject)
return false;
QDBusContext *dbusContext = reinterpret_cast<QDBusContext *>(realObject->qt_metacast("QDBusContext"));
if (!dbusContext)
return false;
if (!dbusContext->calledFromDBus())
return false;
auto ia = policies().constFind(dbusAdaptor);
if (ia == policies().cend())
return false;
auto ip = (*ia).find(function);
if (ip == (*ia).cend())
return true;
try {
uint pid = uint(-1);
if (!ip->m_capabilities.isEmpty()) {
pid = dbusContext->connection().interface()->servicePid(dbusContext->message().service());
const auto apps = ApplicationManager::instance()->identifyAllApplications(pid);
if (apps.size() > 1)
throw "multiple apps per pid are not supported";
const QString appId = !apps.isEmpty() ? apps.constFirst() : QString();
QStringList appCaps = ApplicationManager::instance()->capabilities(appId);
bool match = false;
for (const QString &cap : ip->m_capabilities)
match = match && std::binary_search(appCaps.cbegin(), appCaps.cend(), cap);
if (!match)
throw "insufficient capabilities";
}
if (!ip->m_executables.isEmpty()) {
# if defined(Q_OS_LINUX)
if (pid == uint(-1))
pid = dbusContext->connection().interface()->servicePid(dbusContext->message().service());
QString executable = QFileInfo(qSL("/proc/") + QString::number(pid) + qSL("/exe")).symLinkTarget();
if (executable.isEmpty())
throw "cannot get executable";
if (std::binary_search(ip->m_executables.cbegin(), ip->m_executables.cend(), executable))
throw "executable blocked";
# else
throw false;
# endif // defined(Q_OS_LINUX)
}
if (!ip->m_uids.isEmpty()) {
uint uid = dbusContext->connection().interface()->serviceUid(dbusContext->message().service());
if (std::binary_search(ip->m_uids.cbegin(), ip->m_uids.cend(), uid))
throw "uid blocked";
}
return true;
} catch (const char *msg) {
dbusContext->sendErrorReply(QDBusError::AccessDenied, QString::fromLatin1("Protected function call (%1)").arg(qL1S(msg)));
return false;
}
#endif // !defined(Q_OS_UNIX)
}
QT_END_NAMESPACE_AM
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