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/*
* AccessControlProvider.cpp - implementation of the AccessControlProvider class
*
* Copyright (c) 2016-2019 Tobias Junghans <tobydox@veyon.io>
*
* This file is part of Veyon - http://veyon.io
*
* 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 of the License, or (at your option) any later version.
*
* 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 (see COPYING); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#include <QDebug>
#include <QHostInfo>
#include "UserGroupsBackendManager.h"
#include "AccessControlProvider.h"
#include "NetworkObjectDirectory.h"
#include "NetworkObjectDirectoryManager.h"
#include "VeyonConfiguration.h"
#include "VeyonCore.h"
#include "PlatformPluginInterface.h"
#include "PlatformUserFunctions.h"
AccessControlProvider::AccessControlProvider() :
m_accessControlRules(),
m_userGroupsBackend( VeyonCore::userGroupsBackendManager().accessControlBackend() ),
m_networkObjectDirectory( VeyonCore::networkObjectDirectoryManager().configuredDirectory() ),
m_queryDomainGroups( VeyonCore::config().domainGroupsForAccessControlEnabled() )
{
const QJsonArray accessControlRules = VeyonCore::config().accessControlRules();
m_accessControlRules.reserve( accessControlRules.size() );
for( const auto& accessControlRule : accessControlRules )
{
m_accessControlRules.append( accessControlRule );
}
}
QStringList AccessControlProvider::userGroups() const
{
auto userGroupList = m_userGroupsBackend->userGroups( m_queryDomainGroups );
std::sort( userGroupList.begin(), userGroupList.end() );
return userGroupList;
}
QStringList AccessControlProvider::rooms() const
{
auto roomList = objectNames( m_networkObjectDirectory->queryObjects( NetworkObject::Group ) );
std::sort( roomList.begin(), roomList.end() );
return roomList;
}
QStringList AccessControlProvider::roomsOfComputer( const QString& computer ) const
{
const auto computers = m_networkObjectDirectory->queryObjects( NetworkObject::Host, computer );
if( computers.isEmpty() )
{
return {};
}
QStringList roomList;
roomList.reserve( computers.size() );
for( const auto& computer : computers )
{
roomList.append( m_networkObjectDirectory->queryParent( computer ).name() );
}
return roomList;
}
AccessControlProvider::AccessResult AccessControlProvider::checkAccess( const QString& accessingUser,
const QString& accessingComputer,
const QStringList& connectedUsers )
{
if( VeyonCore::config().isAccessRestrictedToUserGroups() )
{
if( processAuthorizedGroups( accessingUser ) )
{
return AccessAllow;
}
}
else if( VeyonCore::config().isAccessControlRulesProcessingEnabled() )
{
auto action = processAccessControlRules( accessingUser,
accessingComputer,
VeyonCore::platform().userFunctions().currentUser(),
QHostInfo::localHostName(),
connectedUsers );
switch( action )
{
case AccessControlRule::ActionAllow:
return AccessAllow;
case AccessControlRule::ActionAskForPermission:
return AccessToBeConfirmed;
default: break;
}
}
else
{
qDebug( "AccessControlProvider::checkAccess(): "
"no access control method configured, allowing access." );
// no access control method configured, therefore grant access
return AccessAllow;
}
qDebug( "AccessControlProvider::checkAccess(): "
"configured access control method did not succeed, denying access." );
// configured access control method did not succeed, therefore deny access
return AccessDeny;
}
bool AccessControlProvider::processAuthorizedGroups( const QString& accessingUser )
{
qDebug() << "AccessControlProvider::processAuthorizedGroups(): processing for user" << accessingUser;
return intersects( m_userGroupsBackend->groupsOfUser( accessingUser, m_queryDomainGroups ).toSet(),
VeyonCore::config().authorizedUserGroups().toSet() );
}
AccessControlRule::Action AccessControlProvider::processAccessControlRules( const QString& accessingUser,
const QString& accessingComputer,
const QString& localUser,
const QString& localComputer,
const QStringList& connectedUsers )
{
qDebug() << "AccessControlProvider::processAccessControlRules(): processing rules for"
<< accessingUser << accessingComputer << localUser << localComputer << connectedUsers;
for( const auto& rule : qAsConst( m_accessControlRules ) )
{
// rule disabled?
if( rule.action() == AccessControlRule::ActionNone )
{
// then continue with next rule
continue;
}
if( rule.areConditionsIgnored() ||
matchConditions( rule, accessingUser, accessingComputer, localUser, localComputer, connectedUsers ) )
{
qDebug() << "AccessControlProvider::processAccessControlRules(): rule"
<< rule.name() << "matched with action" << rule.action();
return rule.action();
}
}
qDebug() << "AccessControlProvider::processAccessControlRules(): no matching rule, denying access";
return AccessControlRule::ActionDeny;
}
/*!
* \brief Returns whether any incoming access requests would be denied due to a deny rule matching the local state (e.g. teacher logged on)
*/
bool AccessControlProvider::isAccessToLocalComputerDenied() const
{
if( VeyonCore::config().isAccessControlRulesProcessingEnabled() == false )
{
return false;
}
for( const auto& rule : qAsConst( m_accessControlRules ) )
{
if( rule.action() == AccessControlRule::ActionDeny &&
matchConditions( rule, QString(), QString(),
VeyonCore::platform().userFunctions().currentUser(),
QHostInfo::localHostName(),
QStringList() ) )
{
return true;
}
}
return false;
}
bool AccessControlProvider::isMemberOfUserGroup( const QString &user,
const QString &groupName ) const
{
QRegExp groupNameRX( groupName );
if( groupNameRX.isValid() )
{
return m_userGroupsBackend->groupsOfUser( user, m_queryDomainGroups ).indexOf( QRegExp( groupName ) ) >= 0;
}
return m_userGroupsBackend->groupsOfUser( user, m_queryDomainGroups ).contains( groupName );
}
bool AccessControlProvider::isLocatedInRoom( const QString &computer, const QString &roomName ) const
{
return roomsOfComputer( computer ).contains( roomName );
}
bool AccessControlProvider::hasGroupsInCommon( const QString &userOne, const QString &userTwo ) const
{
const auto userOneGroups = m_userGroupsBackend->groupsOfUser( userOne, m_queryDomainGroups );
const auto userTwoGroups = m_userGroupsBackend->groupsOfUser( userTwo, m_queryDomainGroups );
return intersects( userOneGroups.toSet(), userTwoGroups.toSet() );
}
bool AccessControlProvider::isLocatedInSameRoom( const QString &computerOne, const QString &computerTwo ) const
{
const auto computerOneRooms = roomsOfComputer( computerOne );
const auto computerTwoRooms = roomsOfComputer( computerTwo );
return intersects( computerOneRooms.toSet(), computerTwoRooms.toSet() );
}
bool AccessControlProvider::isLocalHost( const QString &accessingComputer ) const
{
return QHostAddress( accessingComputer ).isLoopback();
}
bool AccessControlProvider::isLocalUser( const QString &accessingUser, const QString &localUser ) const
{
return accessingUser == localUser;
}
bool AccessControlProvider::isNoUserLoggedOn() const
{
return VeyonCore::platform().userFunctions().loggedOnUsers().isEmpty();
}
QString AccessControlProvider::lookupSubject( AccessControlRule::Subject subject,
const QString &accessingUser, const QString &accessingComputer,
const QString &localUser, const QString &localComputer ) const
{
switch( subject )
{
case AccessControlRule::SubjectAccessingUser: return accessingUser;
case AccessControlRule::SubjectAccessingComputer: return accessingComputer;
case AccessControlRule::SubjectLocalUser: return localUser;
case AccessControlRule::SubjectLocalComputer: return localComputer;
default: break;
}
return QString();
}
bool AccessControlProvider::matchConditions( const AccessControlRule &rule,
const QString& accessingUser, const QString& accessingComputer,
const QString& localUser, const QString& localComputer,
const QStringList& connectedUsers ) const
{
bool hasConditions = false;
// normally all selected conditions have to match in order to make the whole rule match
// if conditions should be inverted (i.e. "is member of" is to be interpreted as "is NOT member of")
// we have to check against the opposite boolean value
bool matchResult = rule.areConditionsInverted() == false;
qDebug() << "AccessControlProvider::matchConditions():" << rule.toJson() << matchResult;
auto condition = AccessControlRule::ConditionMemberOfUserGroup;
if( rule.isConditionEnabled( condition ) )
{
hasConditions = true;
const auto user = lookupSubject( rule.subject( condition ), accessingUser, QString(), localUser, QString() );
const auto group = rule.argument( condition );
if( user.isEmpty() || group.isEmpty() ||
isMemberOfUserGroup( user, group ) != matchResult )
{
return false;
}
}
condition = AccessControlRule::ConditionGroupsInCommon;
if( rule.isConditionEnabled( condition ) )
{
hasConditions = true;
if( accessingUser.isEmpty() || localUser.isEmpty() ||
hasGroupsInCommon( accessingUser, localUser ) != matchResult )
{
return false;
}
}
condition = AccessControlRule::ConditionLocatedInRoom;
if( rule.isConditionEnabled( condition ) )
{
hasConditions = true;
const auto computer = lookupSubject( rule.subject( condition ), QString(), accessingComputer, QString(), localComputer );
const auto room = rule.argument( condition );
if( computer.isEmpty() || room.isEmpty() ||
isLocatedInRoom( computer, room ) != matchResult )
{
return false;
}
}
condition = AccessControlRule::ConditionLocatedInSameRoom;
if( rule.isConditionEnabled( condition ) )
{
hasConditions = true;
if( accessingComputer.isEmpty() || localComputer.isEmpty() ||
isLocatedInSameRoom( accessingComputer, localComputer ) != matchResult )
{
return false;
}
}
if( rule.isConditionEnabled( AccessControlRule::ConditionAccessFromLocalHost ) )
{
hasConditions = true;
if( isLocalHost( accessingComputer ) != matchResult )
{
return false;
}
}
if( rule.isConditionEnabled( AccessControlRule::ConditionAccessFromLocalUser ) )
{
hasConditions = true;
if( isLocalUser( accessingUser, localUser ) != matchResult )
{
return false;
}
}
if( rule.isConditionEnabled( AccessControlRule::ConditionAccessFromAlreadyConnectedUser ) )
{
hasConditions = true;
if( connectedUsers.contains( accessingUser ) != matchResult )
{
return false;
}
}
if( rule.isConditionEnabled( AccessControlRule::ConditionNoUserLoggedOn ) )
{
hasConditions = true;
if( isNoUserLoggedOn() != matchResult )
{
return false;
}
}
// do not match the rule if no conditions are set at all
if( hasConditions == false )
{
return false;
}
return true;
}
QStringList AccessControlProvider::objectNames( const QList<NetworkObject>& objects )
{
QStringList nameList;
nameList.reserve( objects.size() );
for( const auto& object : objects )
{
nameList.append( object.name() );
}
return nameList;
}
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