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/*
* Copyright (C) 2020 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 "HibpDownloader.h"
#include "core/NetworkManager.h"
#include <QCryptographicHash>
#include <QNetworkReply>
namespace
{
/*
* Return the SHA1 hash of the specified password in upper-case hex.
*
* The result is always exactly 40 characters long.
*/
QString sha1Hex(const QString& password)
{
// Get the binary SHA1
const auto sha1 = QCryptographicHash::hash(password.toUtf8(), QCryptographicHash::Sha1);
return sha1.toHex().toUpper();
}
/*
* Search a password's hash in the output of the HIBP web service.
*
* Returns the number of times the password is found in breaches, or
* 0 if the password is not in the HIBP result.
*/
int pwnCount(const QString& password, const QString& hibpResult)
{
// The first 5 characters of the hash are in the URL already,
// the HIBP result contains the remainder
auto pos = hibpResult.indexOf(sha1Hex(password).mid(5));
if (pos < 0) {
return 0;
}
// Skip past the sha1 and ':'
pos += 36;
// Find where the count ends
auto end = hibpResult.indexOf('\n', pos);
if (end < 0) {
end = hibpResult.size();
}
// Extract the count, remove remaining whitespace, and convert to int
return hibpResult.midRef(pos, end - pos).trimmed().toInt();
}
} // namespace
HibpDownloader::HibpDownloader(QObject* parent)
: QObject(parent)
{
}
HibpDownloader::~HibpDownloader()
{
abort();
}
/*
* Add one password to the list list of passwords to check.
*
* Invoke this function once for every password to check,
* then call validate().
*/
void HibpDownloader::add(const QString& password)
{
if (!m_pwdsToTry.contains(password)) {
m_pwdsToTry << password;
}
}
/*
* Start validating the passwords against HIBP.
*/
void HibpDownloader::validate()
{
for (auto password : m_pwdsToTry) {
// The URL we query is https://api.pwnedpasswords.com/range/XXXXX,
// where XXXXX is the first five bytes of the hex representation of
// the password's SHA1.
const auto url = QString("https://api.pwnedpasswords.com/range/") + sha1Hex(password).left(5);
// HIBP requires clients to specify a user agent in the request
// (https://haveibeenpwned.com/API/v3#UserAgent); however, in order
// to minimize the amount of information we expose about ourselves,
// we don't add the KeePassXC version number or platform.
auto request = QNetworkRequest(url);
request.setRawHeader("User-Agent", "KeePassXC");
// Finally, submit the request to HIBP.
auto reply = getNetMgr()->get(request);
connect(reply, &QNetworkReply::finished, this, &HibpDownloader::fetchFinished);
connect(reply, &QIODevice::readyRead, this, &HibpDownloader::fetchReadyRead);
m_replies.insert(reply, {password, {}});
}
m_pwdsToTry.clear();
}
int HibpDownloader::passwordsToValidate() const
{
return m_pwdsToTry.size();
}
int HibpDownloader::passwordsRemaining() const
{
return m_replies.size();
}
/*
* Abort the current online activity (if any).
*/
void HibpDownloader::abort()
{
for (auto reply : m_replies.keys()) {
reply->abort();
reply->deleteLater();
}
m_replies.clear();
}
/*
* Called when new data has been loaded from the HIBP server.
*/
void HibpDownloader::fetchReadyRead()
{
const auto reply = qobject_cast<QNetworkReply*>(sender());
auto entry = m_replies.find(reply);
if (entry != m_replies.end()) {
entry->second += reply->readAll();
}
}
/*
* Called after all data has been loaded from the HIBP server.
*/
void HibpDownloader::fetchFinished()
{
const auto reply = qobject_cast<QNetworkReply*>(sender());
const auto entry = m_replies.find(reply);
if (entry == m_replies.end()) {
return;
}
// Get result status
const auto ok = reply->error() == QNetworkReply::NoError;
const auto err = reply->errorString();
const auto password = entry->first;
const auto hibpReply = entry->second;
reply->deleteLater();
m_replies.remove(reply);
// If there was an error, assume it's permanent and abort
// (don't process the rest of the password list).
if (!ok) {
auto msg = tr("Online password validation failed") + ":\n" + err;
if (!hibpReply.isEmpty()) {
msg += "\n" + hibpReply;
}
abort();
emit fetchFailed(msg);
return;
}
// Current password validated, send the result to the caller
emit hibpResult(password, pwnCount(password, hibpReply));
}
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