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YubiKey.cpp
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YubiKey.cpp
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/*
* Copyright (C) 2014 Kyle Manna <kyle@kylemanna.com>
* Copyright (C) 2017-2021 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 "YubiKey.h"
#include "YubiKeyInterfacePCSC.h"
#include "YubiKeyInterfaceUSB.h"
#include <QMutexLocker>
#include <QSet>
#include <QtConcurrent>
QMutex YubiKey::s_interfaceMutex(QMutex::Recursive);
YubiKey::YubiKey()
{
int num_interfaces = 0;
if (YubiKeyInterfaceUSB::instance()->isInitialized()) {
++num_interfaces;
connect(YubiKeyInterfaceUSB::instance(), SIGNAL(challengeStarted()), this, SIGNAL(challengeStarted()));
connect(YubiKeyInterfaceUSB::instance(), SIGNAL(challengeCompleted()), this, SIGNAL(challengeCompleted()));
} else {
qDebug("YubiKey: USB interface is not initialized.");
}
if (YubiKeyInterfacePCSC::instance()->isInitialized()) {
++num_interfaces;
connect(YubiKeyInterfacePCSC::instance(), SIGNAL(challengeStarted()), this, SIGNAL(challengeStarted()));
connect(YubiKeyInterfacePCSC::instance(), SIGNAL(challengeCompleted()), this, SIGNAL(challengeCompleted()));
} else {
qDebug("YubiKey: PCSC interface is disabled or not initialized.");
}
m_initialized = num_interfaces > 0;
m_interactionTimer.setSingleShot(true);
m_interactionTimer.setInterval(200);
connect(&m_interactionTimer, SIGNAL(timeout()), this, SIGNAL(userInteractionRequest()));
connect(this, &YubiKey::challengeStarted, this, [this] { m_interactionTimer.start(); });
connect(this, &YubiKey::challengeCompleted, this, [this] { m_interactionTimer.stop(); });
}
YubiKey* YubiKey::m_instance(nullptr);
YubiKey* YubiKey::instance()
{
if (!m_instance) {
m_instance = new YubiKey();
}
return m_instance;
}
bool YubiKey::isInitialized()
{
return m_initialized;
}
bool YubiKey::findValidKeys()
{
QMutexLocker lock(&s_interfaceMutex);
m_usbKeys = YubiKeyInterfaceUSB::instance()->findValidKeys();
m_pcscKeys = YubiKeyInterfacePCSC::instance()->findValidKeys();
return !m_usbKeys.isEmpty() || !m_pcscKeys.isEmpty();
}
void YubiKey::findValidKeysAsync()
{
QtConcurrent::run([this] { emit detectComplete(findValidKeys()); });
}
YubiKey::KeyMap YubiKey::foundKeys()
{
QMutexLocker lock(&s_interfaceMutex);
KeyMap foundKeys;
for (auto i = m_usbKeys.cbegin(); i != m_usbKeys.cend(); ++i) {
foundKeys.insert(i.key(), i.value());
}
for (auto i = m_pcscKeys.cbegin(); i != m_pcscKeys.cend(); ++i) {
foundKeys.insert(i.key(), i.value());
}
return foundKeys;
}
QString YubiKey::errorMessage()
{
QMutexLocker lock(&s_interfaceMutex);
QString error;
error.clear();
if (!m_error.isNull()) {
error += tr("General: ") + m_error;
}
QString usb_error = YubiKeyInterfaceUSB::instance()->errorMessage();
if (!usb_error.isNull()) {
if (!error.isNull()) {
error += " | ";
}
error += "USB: " + usb_error;
}
QString pcsc_error = YubiKeyInterfacePCSC::instance()->errorMessage();
if (!pcsc_error.isNull()) {
if (!error.isNull()) {
error += " | ";
}
error += "PCSC: " + pcsc_error;
}
return error;
}
/**
* Issue a test challenge to the specified slot to determine if challenge
* response is properly configured.
*
* @param slot YubiKey configuration slot
* @param wouldBlock return if the operation requires user input
* @return whether the challenge succeeded
*/
bool YubiKey::testChallenge(YubiKeySlot slot, bool* wouldBlock)
{
QMutexLocker lock(&s_interfaceMutex);
if (m_usbKeys.contains(slot)) {
return YubiKeyInterfaceUSB::instance()->testChallenge(slot, wouldBlock);
}
if (m_pcscKeys.contains(slot)) {
return YubiKeyInterfacePCSC::instance()->testChallenge(slot, wouldBlock);
}
return false;
}
/**
* Issue a challenge to the specified slot
* This operation could block if the YubiKey requires a touch to trigger.
*
* @param slot YubiKey configuration slot
* @param challenge challenge input to YubiKey
* @param response response output from YubiKey
* @return challenge result
*/
YubiKey::ChallengeResult
YubiKey::challenge(YubiKeySlot slot, const QByteArray& challenge, Botan::secure_vector<char>& response)
{
QMutexLocker lock(&s_interfaceMutex);
m_error.clear();
// Make sure we tried to find available keys
if (m_usbKeys.isEmpty() && m_pcscKeys.isEmpty()) {
findValidKeys();
}
if (m_usbKeys.contains(slot)) {
return YubiKeyInterfaceUSB::instance()->challenge(slot, challenge, response);
}
if (m_pcscKeys.contains(slot)) {
return YubiKeyInterfacePCSC::instance()->challenge(slot, challenge, response);
}
m_error = tr("Could not find interface for hardware key with serial number %1. Please connect it to continue.")
.arg(slot.first);
return ChallengeResult::YCR_ERROR;
}