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authenticate.cpp
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/*
* Copyright (c) 2020-2024 Estonian Information System Authority
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "authenticate.hpp"
#include "signauthutils.hpp"
#include <QApplication>
#include <QJsonObject>
#include <QJsonArray>
#include <QJsonDocument>
#include <QCryptographicHash>
#include <QDir>
#include <map>
using namespace electronic_id;
namespace
{
// Use common base64-encoding defaults.
constexpr auto BASE64_OPTIONS = QByteArray::Base64Encoding | QByteArray::KeepTrailingEquals;
QVariantMap createAuthenticationToken(const QString& signatureAlgorithm,
const QByteArray& certificateDer, const QByteArray& signature)
{
return QVariantMap {
{"unverifiedCertificate", QString(certificateDer.toBase64(BASE64_OPTIONS))},
{"algorithm", signatureAlgorithm},
{"signature", QString(signature)},
{"format", QStringLiteral("web-eid:1.0")},
{"appVersion",
QStringLiteral("https://web-eid.eu/web-eid-app/releases/%1")
.arg(QApplication::applicationVersion())},
};
}
QByteArray createSignature(const QString& origin, const QByteArray& cert,
const QString& challengeNonce, const ElectronicID& eid,
const pcsc_cpp::byte_vector& pin)
{
static const std::map<JsonWebSignatureAlgorithm, QCryptographicHash::Algorithm>
SIGNATURE_ALGO_TO_HASH {
{JsonWebSignatureAlgorithm::RS256, QCryptographicHash::Sha256},
{JsonWebSignatureAlgorithm::PS256, QCryptographicHash::Sha256},
{JsonWebSignatureAlgorithm::ES256, QCryptographicHash::Sha256},
{JsonWebSignatureAlgorithm::ES384, QCryptographicHash::Sha384},
{JsonWebSignatureAlgorithm::ES512, QCryptographicHash::Sha512},
};
if (!SIGNATURE_ALGO_TO_HASH.count(eid.authSignatureAlgorithm())) {
THROW(ProgrammingError,
"Hash algorithm mapping missing for signature algorithm "
+ std::string(eid.authSignatureAlgorithm()));
}
const auto hashAlgo = SIGNATURE_ALGO_TO_HASH.at(eid.authSignatureAlgorithm());
// Take the hash of the origin and nonce to ensure field separation.
const auto originHash = QCryptographicHash::hash(origin.toUtf8(), hashAlgo);
const auto challengeNonceHash = QCryptographicHash::hash(challengeNonce.toUtf8(), hashAlgo);
// The value that is signed is hash(origin)+hash(challenge).
const auto hashToBeSignedQBytearray =
QCryptographicHash::hash(originHash + challengeNonceHash, hashAlgo);
const pcsc_cpp::byte_vector hashToBeSigned {hashToBeSignedQBytearray.cbegin(),
hashToBeSignedQBytearray.cend()};
const auto signature = eid.signWithAuthKey({cert.cbegin(), cert.cend()}, pin, hashToBeSigned);
return QByteArray::fromRawData(reinterpret_cast<const char*>(signature.data()),
int(signature.size()))
.toBase64(BASE64_OPTIONS);
}
} // namespace
Authenticate::Authenticate(const CommandWithArguments& cmd) : CertificateReader(cmd)
{
const auto arguments = cmd.second;
requireArgumentsAndOptionalLang(
{"challengeNonce", "origin"}, arguments,
R"("challengeNonce": "<challenge nonce>", "origin": "<origin URL>")");
challengeNonce = validateAndGetArgument<decltype(challengeNonce)>(
QStringLiteral("challengeNonce"), arguments);
// nonce must contain at least 256 bits of entropy and is usually Base64-encoded, so the
// required byte length is 44, the length of 32 Base64-encoded bytes.
if (challengeNonce.length() < 44) {
THROW(CommandHandlerInputDataError,
"Challenge nonce argument 'challengeNonce' must be at least 44 characters long");
}
if (challengeNonce.length() > 128) {
THROW(CommandHandlerInputDataError,
"Challenge nonce argument 'challengeNonce' cannot be longer than 128 characters");
}
validateAndStoreOrigin(arguments);
}
QVariantMap Authenticate::onConfirm(WebEidUI* window,
const CardCertificateAndPinInfo& cardCertAndPin)
{
const auto signatureAlgorithm =
QString::fromStdString(cardCertAndPin.cardInfo->eid().authSignatureAlgorithm());
auto pin = getPin(cardCertAndPin.cardInfo->eid().smartcard(), window);
try {
const auto signature = createSignature(origin.url(), cardCertAndPin.certificateBytesInDer,
challengeNonce, cardCertAndPin.cardInfo->eid(), pin);
// Erase the PIN memory.
// TODO: Use a scope guard. Verify that the buffers are actually zeroed and no copies
// remain.
std::fill(pin.begin(), pin.end(), '\0');
return createAuthenticationToken(signatureAlgorithm, cardCertAndPin.certificateBytesInDer,
signature);
} catch (const VerifyPinFailed& failure) {
switch (failure.status()) {
case VerifyPinFailed::Status::PIN_ENTRY_CANCEL:
case VerifyPinFailed::Status::PIN_ENTRY_TIMEOUT:
break;
case VerifyPinFailed::Status::PIN_ENTRY_DISABLED:
emit retry(RetriableError::PIN_VERIFY_DISABLED);
break;
default:
emit verifyPinFailed(failure.status(), failure.retries());
}
if (failure.retries() > 0) {
throw CommandHandlerVerifyPinFailed(failure.what());
}
throw;
}
}
void Authenticate::connectSignals(const WebEidUI* window)
{
CertificateReader::connectSignals(window);
connect(this, &Authenticate::verifyPinFailed, window, &WebEidUI::onVerifyPinFailed);
}