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PDF4QT/Pdf4QtLib/sources/pdfsignaturehandler.cpp

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// Copyright (C) 2020-2021 Jakub Melka
//
// This file is part of PDF4QT.
//
// PDF4QT is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// with the written consent of the copyright owner, any later version.
//
// PDF4QT 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with PDF4QT. If not, see <https://www.gnu.org/licenses/>.
#include "pdfsignaturehandler.h"
#include "pdfdocument.h"
#include "pdfencoding.h"
#include "pdfform.h"
#include "pdfutils.h"
#include "pdfsignaturehandler_impl.h"
#include <openssl/err.h>
#include <openssl/sha.h>
#include <openssl/rsa.h>
#include <openssl/rsaerr.h>
#include <openssl/ts.h>
#include <openssl/tserr.h>
#include <QMutex>
#include <QMutexLocker>
#include <QDataStream>
#include <QFileInfo>
#include <array>
namespace pdf
{
static QMutex s_globalOpenSSLMutex(QMutex::Recursive);
/// OpenSSL is not thread safe.
class PDFOpenSSLGlobalLock
{
public:
explicit inline PDFOpenSSLGlobalLock() : m_mutexLocker(&s_globalOpenSSLMutex) { }
inline ~PDFOpenSSLGlobalLock() = default;
private:
QMutexLocker m_mutexLocker;
};
PDFSignatureReference PDFSignatureReference::parse(const PDFObjectStorage* storage, PDFObject object)
{
PDFSignatureReference result;
if (const PDFDictionary* dictionary = storage->getDictionaryFromObject(object))
{
PDFDocumentDataLoaderDecorator loader(storage);
constexpr const std::array<std::pair<const char*, PDFSignatureReference::TransformMethod>, 3> types = {
std::pair<const char*, PDFSignatureReference::TransformMethod>{ "DocMDP", PDFSignatureReference::TransformMethod::DocMDP },
std::pair<const char*, PDFSignatureReference::TransformMethod>{ "UR", PDFSignatureReference::TransformMethod::UR },
std::pair<const char*, PDFSignatureReference::TransformMethod>{ "FieldMDP", PDFSignatureReference::TransformMethod::FieldMDP }
};
// Jakub Melka: parse the signature reference dictionary
result.m_transformMethod = loader.readEnumByName(dictionary->get("TransformMethod"), types.cbegin(), types.cend(), PDFSignatureReference::TransformMethod::Invalid);
result.m_transformParams = dictionary->get("TransformParams");
result.m_data = dictionary->get("Data");
result.m_digestMethod = loader.readNameFromDictionary(dictionary, "DigestMethod");
}
return result;
}
PDFSignature PDFSignature::parse(const PDFObjectStorage* storage, PDFObject object)
{
PDFSignature result;
if (const PDFDictionary* dictionary = storage->getDictionaryFromObject(object))
{
PDFDocumentDataLoaderDecorator loader(storage);
constexpr const std::array<std::pair<const char*, Type>, 2> types = {
std::pair<const char*, Type>{ "Sig", Type::Sig },
std::pair<const char*, Type>{ "DocTimeStamp", Type::DocTimeStamp }
};
// Jakub Melka: parse the signature dictionary
result.m_type = loader.readEnumByName(dictionary->get("Type"), types.cbegin(), types.cend(), Type::Sig);
result.m_filter = loader.readNameFromDictionary(dictionary, "Filter");
result.m_subfilter = loader.readNameFromDictionary(dictionary, "SubFilter");
result.m_contents = loader.readStringFromDictionary(dictionary, "Contents");
if (dictionary->hasKey("Cert"))
{
PDFObject certificates = storage->getObject(dictionary->get("Cert"));
if (certificates.isString())
{
result.m_certificates = { loader.readString(certificates) };
}
else if (certificates.isArray())
{
result.m_certificates = loader.readStringArray(certificates);
}
}
std::vector<PDFInteger> byteRangesArray = loader.readIntegerArrayFromDictionary(dictionary, "ByteRange");
const size_t byteRangeCount = byteRangesArray.size() / 2;
result.m_byteRanges.reserve(byteRangeCount);
for (size_t i = 0; i < byteRangeCount; ++i)
{
ByteRange byteRange = { byteRangesArray[2 * i], byteRangesArray[2 * i + 1] };
result.m_byteRanges.push_back(byteRange);
}
result.m_references = loader.readObjectList<PDFSignatureReference>(dictionary->get("Reference"));
std::vector<PDFInteger> changes = loader.readIntegerArrayFromDictionary(dictionary, "Changes");
if (changes.size() == 3)
{
result.m_changes = { changes[0], changes[1], changes[2] };
}
result.m_name = loader.readTextStringFromDictionary(dictionary, "Name", QString());
result.m_signingDateTime = PDFEncoding::convertToDateTime(loader.readStringFromDictionary(dictionary, "M"));
result.m_location = loader.readTextStringFromDictionary(dictionary, "Location", QString());
result.m_reason = loader.readTextStringFromDictionary(dictionary, "Reason", QString());
result.m_contactInfo = loader.readTextStringFromDictionary(dictionary, "ContactInfo", QString());
result.m_R = loader.readIntegerFromDictionary(dictionary, "R", 0);
result.m_V = loader.readIntegerFromDictionary(dictionary, "V", 0);
result.m_propBuild = dictionary->get("Prop_Build");
result.m_propTime = loader.readIntegerFromDictionary(dictionary, "Prop_AuthTime", 0);
constexpr const std::array<std::pair<const char*, AuthentificationType>, 3> authentificationTypes = {
std::pair<const char*, AuthentificationType>{ "PIN", AuthentificationType::PIN },
std::pair<const char*, AuthentificationType>{ "Password", AuthentificationType::Password },
std::pair<const char*, AuthentificationType>{ "Fingerprint", AuthentificationType::Fingerprint }
};
result.m_propType = loader.readEnumByName(dictionary->get("Prop_AuthType"), authentificationTypes.cbegin(), authentificationTypes.cend(), AuthentificationType::Invalid);
}
return result;
}
PDFSignatureHandler* PDFSignatureHandler::createHandler(const PDFFormFieldSignature* signatureField, const QByteArray& sourceData, const Parameters& parameters)
{
Q_ASSERT(signatureField);
const QByteArray& subfilter = signatureField->getSignature().getSubfilter();
if (subfilter == "adbe.pkcs7.detached")
{
return new PDFSignatureHandler_adbe_pkcs7_detached(signatureField, sourceData, parameters);
}
else if (subfilter == "adbe.pkcs7.sha1")
{
return new PDFSignatureHandler_adbe_pkcs7_sha1(signatureField, sourceData, parameters);
}
else if (subfilter == "adbe.x509.rsa_sha1")
{
return new PDFSignatureHandler_adbe_pkcs7_rsa_sha1(signatureField, sourceData, parameters);
}
else if (subfilter == "ETSI.CAdES.detached")
{
return new PDFSignatureHandler_ETSI_CAdES_detached(signatureField, sourceData, parameters);
}
else if (subfilter == "ETSI.RFC3161")
{
return new PDFSignatureHandler_ETSI_RFC3161(signatureField, sourceData, parameters);
}
return nullptr;
}
std::vector<PDFSignatureVerificationResult> PDFSignatureHandler::verifySignatures(const PDFForm& form, const QByteArray& sourceData, const Parameters& parameters)
{
std::vector<PDFSignatureVerificationResult> result;
if (parameters.enableVerification && (form.isAcroForm() || form.isXFAForm()))
{
std::vector<const PDFFormFieldSignature*> signatureFields;
auto getSignatureFields = [&signatureFields](const PDFFormField* field)
{
if (field->getFieldType() == PDFFormField::FieldType::Signature)
{
const PDFFormFieldSignature* signatureField = dynamic_cast<const PDFFormFieldSignature*>(field);
Q_ASSERT(signatureField);
signatureFields.push_back(signatureField);
}
};
form.apply(getSignatureFields);
result.reserve(signatureFields.size());
for (const PDFFormFieldSignature* signatureField : signatureFields)
{
if (const PDFSignatureHandler* signatureHandler = createHandler(signatureField, sourceData, parameters))
{
result.emplace_back(signatureHandler->verify());
delete signatureHandler;
}
else
{
PDFObjectReference signatureFieldReference = signatureField->getSelfReference();
QString qualifiedName = signatureField->getName(PDFFormField::NameType::FullyQualified);
PDFSignatureVerificationResult verificationResult(signatureField->getSignature().getType(), signatureFieldReference, qMove(qualifiedName));
verificationResult.addNoHandlerError(signatureField->getSignature().getSubfilter());
result.emplace_back(qMove(verificationResult));
}
}
}
return result;
}
void PDFSignatureVerificationResult::addNoHandlerError(const QByteArray& format)
{
m_flags.setFlag(Error_NoHandler);
m_errors << PDFTranslationContext::tr("No signature handler for signature format '%1'.").arg(QString::fromLatin1(format));
}
void PDFSignatureVerificationResult::addInvalidCertificateError()
{
m_flags.setFlag(Error_Certificate_Invalid);
m_errors << PDFTranslationContext::tr("Certificate format is invalid.");
}
void PDFSignatureVerificationResult::addNoSignaturesError()
{
m_flags.setFlag(Error_Certificate_NoSignatures);
m_errors << PDFTranslationContext::tr("No signatures in certificate data.");
}
void PDFSignatureVerificationResult::addCertificateMissingError()
{
m_flags.setFlag(Error_Certificate_Missing);
m_errors << PDFTranslationContext::tr("Certificate is missing.");
}
void PDFSignatureVerificationResult::addCertificateGenericError()
{
m_flags.setFlag(Error_Certificate_Generic);
m_errors << PDFTranslationContext::tr("Generic error occured during certificate validation.");
}
void PDFSignatureVerificationResult::addCertificateExpiredError()
{
m_flags.setFlag(Error_Certificate_Expired);
m_errors << PDFTranslationContext::tr("Certificate has expired.");
}
void PDFSignatureVerificationResult::addCertificateSelfSignedError()
{
m_flags.setFlag(Error_Certificate_SelfSigned);
m_errors << PDFTranslationContext::tr("Certificate is self-signed.");
}
void PDFSignatureVerificationResult::addCertificateSelfSignedInChainError()
{
m_flags.setFlag(Error_Certificate_SelfSignedChain);
m_errors << PDFTranslationContext::tr("Self-signed certificate in chain.");
}
void PDFSignatureVerificationResult::addCertificateTrustedNotFoundError()
{
m_flags.setFlag(Error_Certificate_TrustedNotFound);
m_errors << PDFTranslationContext::tr("Trusted certificate not found.");
}
void PDFSignatureVerificationResult::addCertificateRevokedError()
{
m_flags.setFlag(Error_Certificate_Revoked);
m_errors << PDFTranslationContext::tr("Certificate has been revoked.");
}
void PDFSignatureVerificationResult::addCertificateOtherError(int error)
{
m_flags.setFlag(Error_Certificate_Other);
m_errors << PDFTranslationContext::tr("Certificate validation failed with code %1.").arg(error);
}
void PDFSignatureVerificationResult::addInvalidSignatureError()
{
m_flags.setFlag(Error_Signature_Invalid);
m_errors << PDFTranslationContext::tr("Signature is invalid.");
}
void PDFSignatureVerificationResult::addSignatureNoSignaturesFoundError()
{
m_flags.setFlag(Error_Signature_NoSignaturesFound);
m_errors << PDFTranslationContext::tr("No signatures found in certificate.");
}
void PDFSignatureVerificationResult::addSignatureCertificateMissingError()
{
m_flags.setFlag(Error_Signature_SourceCertificateMissing);
m_errors << PDFTranslationContext::tr("Signature certificate is missing.");
}
void PDFSignatureVerificationResult::addSignatureDigestFailureError()
{
m_flags.setFlag(Error_Signature_DigestFailure);
m_errors << PDFTranslationContext::tr("Signed data has different hash function digest.");
}
void PDFSignatureVerificationResult::addSignatureDataOtherError()
{
m_flags.setFlag(Error_Signature_DataOther);
m_errors << PDFTranslationContext::tr("Signed data are invalid.");
}
void PDFSignatureVerificationResult::addSignatureDataCoveredBySignatureMissingError()
{
m_flags.setFlag(Error_Signature_DataCoveredBySignatureMissing);
m_errors << PDFTranslationContext::tr("Data covered by signature are not present.");
}
void PDFSignatureVerificationResult::addSignatureNotCoveredBytesWarning(PDFInteger count)
{
if (!m_flags.testFlag(Warning_Signature_NotCoveredBytes))
{
m_flags.setFlag(Warning_Signature_NotCoveredBytes);
m_warnings << PDFTranslationContext::tr("%1 bytes are not covered by signature.").arg(count);
}
}
void PDFSignatureVerificationResult::addCertificateCRLValidityTimeExpiredWarning()
{
if (!m_flags.testFlag(Warning_Certificate_CRLValidityTimeExpired))
{
m_flags.setFlag(Warning_Certificate_CRLValidityTimeExpired);
m_warnings << PDFTranslationContext::tr("Certificate revocation list (CRL) not checked, validity time has expired.");
}
}
void PDFSignatureVerificationResult::addCertificateQualifiedStatementNotVerifiedWarning()
{
if (!m_flags.testFlag(Warning_Certificate_QualifiedStatement))
{
m_flags.setFlag(Warning_Certificate_QualifiedStatement);
m_warnings << PDFTranslationContext::tr("Qualified certificate statement not verified.");
}
}
void PDFSignatureVerificationResult::setSignatureFieldQualifiedName(const QString& signatureFieldQualifiedName)
{
m_signatureFieldQualifiedName = signatureFieldQualifiedName;
}
void PDFSignatureVerificationResult::setSignatureFieldReference(PDFObjectReference signatureFieldReference)
{
m_signatureFieldReference = signatureFieldReference;
}
void PDFSignatureVerificationResult::addHashAlgorithm(const QString& algorithm)
{
if (!m_hashAlgorithms.contains(algorithm))
{
m_hashAlgorithms << algorithm;
}
}
void PDFSignatureVerificationResult::validate()
{
if (isCertificateValid() && isSignatureValid())
{
m_flags.setFlag(OK);
}
}
QDateTime PDFSignatureVerificationResult::getSignatureDate() const
{
return m_signatureDate;
}
void PDFSignatureVerificationResult::setSignatureDate(const QDateTime& signatureDate)
{
m_signatureDate = signatureDate;
}
QDateTime PDFSignatureVerificationResult::getTimestampDate() const
{
return m_timestampDate;
}
void PDFSignatureVerificationResult::setTimestampDate(const QDateTime& timestampDate)
{
m_timestampDate = timestampDate;
}
QByteArray PDFSignatureVerificationResult::getSignatureHandler() const
{
return m_signatureHandler;
}
void PDFSignatureVerificationResult::setSignatureHandler(const QByteArray& signatureFilter)
{
m_signatureHandler = signatureFilter;
}
PDFSignatureVerificationResult::Status PDFSignatureVerificationResult::getCertificateStatus() const
{
if (hasCertificateError())
{
return Status::Error;
}
if (hasCertificateWarning())
{
return Status::Warning;
}
return Status::OK;
}
PDFSignatureVerificationResult::Status PDFSignatureVerificationResult::getSignatureStatus() const
{
if (hasSignatureError())
{
return Status::Error;
}
if (hasSignatureWarning())
{
return Status::Warning;
}
return Status::OK;
}
QString PDFSignatureVerificationResult::getStatusText(Status status)
{
switch (status)
{
case Status::OK:
return PDFTranslationContext::tr("OK");
case Status::Warning:
return PDFTranslationContext::tr("Warning");
case Status::Error:
return PDFTranslationContext::tr("Error");
default:
break;
}
return QString();
}
const PDFClosedIntervalSet& PDFSignatureVerificationResult::getBytesCoveredBySignature() const
{
return m_bytesCoveredBySignature;
}
void PDFSignatureVerificationResult::setBytesCoveredBySignature(const PDFClosedIntervalSet& bytesCoveredBySignature)
{
m_bytesCoveredBySignature = bytesCoveredBySignature;
}
PDFSignature::Type PDFSignatureVerificationResult::getType() const
{
return m_type;
}
void PDFSignatureVerificationResult::setType(const PDFSignature::Type& type)
{
m_type = type;
}
void PDFPublicKeySignatureHandler::initializeResult(PDFSignatureVerificationResult& result) const
{
PDFObjectReference signatureFieldReference = m_signatureField->getSelfReference();
QString signatureFieldQualifiedName = m_signatureField->getName(PDFFormField::NameType::FullyQualified);
result.setType(m_signatureField->getSignature().getType());
result.setSignatureFieldReference(signatureFieldReference);
result.setSignatureFieldQualifiedName(signatureFieldQualifiedName);
result.setSignatureHandler(m_signatureField->getSignature().getSubfilter());
}
STACK_OF(X509)* PDFPublicKeySignatureHandler::getCertificates(PKCS7* pkcs7)
{
if (!pkcs7)
{
return nullptr;
}
if (PKCS7_type_is_signed(pkcs7))
{
return pkcs7->d.sign->cert;
}
if (PKCS7_type_is_signedAndEnveloped(pkcs7))
{
return pkcs7->d.signed_and_enveloped->cert;
}
return nullptr;
}
void PDFPublicKeySignatureHandler::verifyCertificate(PDFSignatureVerificationResult& result) const
{
PDFOpenSSLGlobalLock lock;
OpenSSL_add_all_algorithms();
const PDFSignature& signature = m_signatureField->getSignature();
const QByteArray& content = signature.getContents();
// Jakub Melka: we will try to get pkcs7 from signature, then
// verify signer certificates.
const unsigned char* data = convertByteArrayToUcharPtr(content);
if (PKCS7* pkcs7 = d2i_PKCS7(nullptr, &data, content.size()))
{
X509_STORE* store = X509_STORE_new();
X509_STORE_CTX* context = X509_STORE_CTX_new();
// Above functions can fail only if not enough memory. But in this
// case, this library will crash anyway.
Q_ASSERT(store);
Q_ASSERT(context);
addTrustedCertificates(store);
STACK_OF(PKCS7_SIGNER_INFO)* signerInfo = PKCS7_get_signer_info(pkcs7);
const int signerInfoCount = sk_PKCS7_SIGNER_INFO_num(signerInfo);
STACK_OF(X509)* certificates = getCertificates(pkcs7);
if (signerInfo && signerInfoCount > 0 && certificates)
{
for (int i = 0; i < signerInfoCount; ++i)
{
PKCS7_SIGNER_INFO* signerInfoValue = sk_PKCS7_SIGNER_INFO_value(signerInfo, i);
PKCS7_ISSUER_AND_SERIAL* issuerAndSerial = signerInfoValue->issuer_and_serial;
X509* signer = X509_find_by_issuer_and_serial(certificates, issuerAndSerial->issuer, issuerAndSerial->serial);
if (!signer)
{
result.addCertificateMissingError();
break;
}
if (!X509_STORE_CTX_init(context, store, signer, certificates))
{
result.addCertificateGenericError();
break;
}
if (!X509_STORE_CTX_set_purpose(context, X509_PURPOSE_SMIME_SIGN))
{
result.addCertificateGenericError();
break;
}
unsigned long flags = X509_V_FLAG_TRUSTED_FIRST;
if (m_parameters.ignoreExpirationDate)
{
flags |= X509_V_FLAG_NO_CHECK_TIME;
}
X509_STORE_CTX_set_flags(context, flags);
int verificationResult = X509_verify_cert(context);
if (verificationResult <= 0)
{
int error = X509_STORE_CTX_get_error(context);
switch (error)
{
case X509_V_OK:
// Strange, this should not occur... when X509_verify_cert fails
break;
case X509_V_ERR_CERT_HAS_EXPIRED:
result.addCertificateExpiredError();
break;
case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
result.addCertificateSelfSignedError();
break;
case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
result.addCertificateSelfSignedInChainError();
break;
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
result.addCertificateTrustedNotFoundError();
break;
case X509_V_ERR_CERT_REVOKED:
result.addCertificateRevokedError();
break;
default:
result.addCertificateOtherError(error);
break;
}
// We will add certificate info for all certificates
const int count = sk_X509_num(certificates);
for (int i = 0; i < count; ++i)
{
result.addCertificateInfo(getCertificateInfo(sk_X509_value(certificates, i)));
}
}
else
{
STACK_OF(X509)* validChain = X509_STORE_CTX_get0_chain(context);
const int count = sk_X509_num(validChain);
for (int i = 0; i < count; ++i)
{
result.addCertificateInfo(getCertificateInfo(sk_X509_value(validChain, i)));
}
}
X509_STORE_CTX_cleanup(context);
}
}
else
{
result.addNoSignaturesError();
}
X509_STORE_CTX_free(context);
X509_STORE_free(store);
PKCS7_free(pkcs7);
}
else
{
result.addInvalidCertificateError();
}
if (!result.hasCertificateError())
{
result.setFlag(PDFSignatureVerificationResult::Certificate_OK, true);
}
}
BIO* PDFPublicKeySignatureHandler::getSignedDataBuffer(pdf::PDFSignatureVerificationResult& result, QByteArray& outputBuffer) const
{
const PDFSignature& signature = m_signatureField->getSignature();
const QByteArray& contents = signature.getContents();
const QByteArray& sourceData = m_sourceData;
PDFInteger size = 0;
const PDFSignature::ByteRanges& byteRanges = signature.getByteRanges();
for (const PDFSignature::ByteRange& byteRange : byteRanges)
{
size += byteRange.size;
}
// Sanity checks
if (size > sourceData.size())
{
result.addSignatureDataCoveredBySignatureMissingError();
return nullptr;
}
PDFClosedIntervalSet bytesCoveredBySignature;
outputBuffer.reserve(size);
for (const PDFSignature::ByteRange& byteRange : byteRanges)
{
PDFInteger startOffset = byteRange.offset; // Offset to the first data byte
PDFInteger endOffset = byteRange.offset + byteRange.size; // Offset to the byte following last data byte
if (startOffset == endOffset)
{
// This means byte range is zero
continue;
}
if (startOffset > endOffset || startOffset < 0 || endOffset < 0 || startOffset >= m_sourceData.size() || endOffset > m_sourceData.size())
{
result.addSignatureDataCoveredBySignatureMissingError();
return nullptr;
}
const int length = endOffset - startOffset;
outputBuffer.append(sourceData.constData() + startOffset, length);
bytesCoveredBySignature.addInterval(startOffset, endOffset - 1);
}
// Jakub Melka: We must find byte string, which corresponds to signature.
// We find only first occurence, because second one should not exist - because
// it will mean that signature must be covered by itself.
QByteArray hexContents = contents.toHex();
int index = sourceData.indexOf(hexContents);
if (index == -1)
{
index = sourceData.indexOf(hexContents.toUpper());
}
if (index != -1)
{
int firstByteIndex = index;
int lastByteIndex = index + hexContents.size() - 1;
if (firstByteIndex > 0 && sourceData[firstByteIndex - 1] == '<')
{
--firstByteIndex;
}
if (lastByteIndex + 1 < sourceData.size() && sourceData[lastByteIndex + 1] == '>')
{
++lastByteIndex;
}
bytesCoveredBySignature.addInterval(firstByteIndex, lastByteIndex);
}
// We add a warning, that this signature doesn't cover whole source byte range
if (!bytesCoveredBySignature.isCovered(0, sourceData.size() - 1))
{
const PDFInteger notCoveredBytes = sourceData.size() - int(bytesCoveredBySignature.getTotalLength());
result.addSignatureNotCoveredBytesWarning(notCoveredBytes);
}
result.setBytesCoveredBySignature(qMove(bytesCoveredBySignature));
return BIO_new_mem_buf(outputBuffer.data(), outputBuffer.length());
}
void PDFPublicKeySignatureHandler::verifySignature(PDFSignatureVerificationResult& result) const
{
PDFOpenSSLGlobalLock lock;
OpenSSL_add_all_algorithms();
const PDFSignature& signature = m_signatureField->getSignature();
const QByteArray& content = signature.getContents();
// Jakub Melka: we will try to get pkcs7 from signature, then
// verify signer certificates.
const unsigned char* data = convertByteArrayToUcharPtr(content);
if (PKCS7* pkcs7 = d2i_PKCS7(nullptr, &data, content.size()))
{
QByteArray buffer;
if (BIO* inputBuffer = getSignedDataBuffer(result, buffer))
{
if (BIO* dataBio = PKCS7_dataInit(pkcs7, inputBuffer))
{
// Now, we must read from bio to calculate digests (digest is returned)
std::array<char, 16384> buffer = { };
int bytesRead = 0;
do
{
bytesRead = BIO_read(dataBio, buffer.data(), int(buffer.size()));
} while (bytesRead > 0);
STACK_OF(PKCS7_SIGNER_INFO)* signerInfo = PKCS7_get_signer_info(pkcs7);
addHashAlgorithmFromSignerInfoStack(signerInfo, result);
addSignatureDateFromSignerInfoStack(signerInfo, result);
const int signerInfoCount = sk_PKCS7_SIGNER_INFO_num(signerInfo);
STACK_OF(X509)* certificates = getCertificates(pkcs7);
if (signerInfo && signerInfoCount > 0 && certificates)
{
for (int i = 0; i < signerInfoCount; ++i)
{
PKCS7_SIGNER_INFO* signerInfoValue = sk_PKCS7_SIGNER_INFO_value(signerInfo, i);
PKCS7_ISSUER_AND_SERIAL* issuerAndSerial = signerInfoValue->issuer_and_serial;
X509* signer = X509_find_by_issuer_and_serial(certificates, issuerAndSerial->issuer, issuerAndSerial->serial);
if (!signer)
{
result.addSignatureCertificateMissingError();
break;
}
const int verification = PKCS7_signatureVerify(dataBio, pkcs7, signerInfoValue, signer);
if (verification <= 0)
{
const int reason = ERR_GET_REASON(ERR_get_error());
switch (reason)
{
case PKCS7_R_DIGEST_FAILURE:
result.addSignatureDigestFailureError();
break;
default:
result.addSignatureDataOtherError();
break;
}
}
}
}
else
{
result.addSignatureNoSignaturesFoundError();
}
// According to the documentation, we should not call PKCS7_dataFinal
// at the end, when pkcs7 is populated.
BIO_free(dataBio);
}
else
{
result.addInvalidSignatureError();
}
BIO_free(inputBuffer);
}
else
{
// There is no need for adding error, error is in this case added by getSignedDataBuffer function
}
PKCS7_free(pkcs7);
}
else
{
result.addInvalidSignatureError();
}
if (!result.hasSignatureError())
{
result.setFlag(PDFSignatureVerificationResult::Signature_OK, true);
}
}
PDFSignatureVerificationResult PDFSignatureHandler_adbe_pkcs7_detached::verify() const
{
PDFSignatureVerificationResult result;
initializeResult(result);
verifyCertificate(result);
verifySignature(result);
result.validate();
return result;
}
PDFSignatureVerificationResult PDFSignatureHandler_ETSI_CAdES_detached::verify() const
{
PDFSignatureVerificationResult result;
initializeResult(result);
verifyCertificateCAdES(result, X509_PURPOSE_SMIME_SIGN);
verifySignature(result);
result.validate();
return result;
}
PDFSignatureVerificationResult PDFSignatureHandler_ETSI_RFC3161::verify() const
{
PDFSignatureVerificationResult result;
initializeResult(result);
verifyCertificateCAdES(result, X509_PURPOSE_TIMESTAMP_SIGN);
verifySignatureTimestamp(result);
result.validate();
return result;
}
void PDFSignatureHandler_ETSI_RFC3161::verifySignatureTimestamp(PDFSignatureVerificationResult& result) const
{
PDFOpenSSLGlobalLock lock;
OpenSSL_add_all_algorithms();
const PDFSignature& signature = m_signatureField->getSignature();
const QByteArray& content = signature.getContents();
// Jakub Melka: we will try to get pkcs7 from signature, then
// verify signer certificates.
const unsigned char* data = convertByteArrayToUcharPtr(content);
if (PKCS7* pkcs7 = d2i_PKCS7(nullptr, &data, content.size()))
{
QByteArray buffer;
if (BIO* inputBuffer = getSignedDataBuffer(result, buffer))
{
X509_STORE* store = X509_STORE_new();
// Above function can fail only if not enough memory. But in this
// case, this library will crash anyway.
Q_ASSERT(store);
addTrustedCertificates(store);
// Add certificates from DSS store
STACK_OF(X509)* certificatesFromPkcs7 = getCertificates(pkcs7);
STACK_OF(X509)* usedCertificates = sk_X509_new_null();
// First, add all certificates from pkcs7
for (int i = 0; i < sk_X509_num(certificatesFromPkcs7); ++i)
{
X509* certificate = sk_X509_value(certificatesFromPkcs7, i);
sk_X509_push(usedCertificates, certificate);
X509_up_ref(certificate);
}
if (m_parameters.dss && !m_parameters.dss->getMasterItem()->Cert.empty())
{
// Second, add all certificates from document's security store
for (const QByteArray& certificateData : m_parameters.dss->getMasterItem()->Cert)
{
const unsigned char* certificateDataBuffer = convertByteArrayToUcharPtr(certificateData);
if (X509* certificate = d2i_X509(nullptr, &certificateDataBuffer, certificateData.size()))
{
sk_X509_push(usedCertificates, certificate);
}
}
}
// Initialization of verification context
TS_VERIFY_CTX* ts_context = TS_VERIFY_CTX_new();
TS_VERIFY_CTX_init(ts_context);
TS_VERIFY_CTX_set_data(ts_context, inputBuffer);
TS_VERIFY_CTX_set_flags(ts_context, TS_VFY_ALL_DATA & ~TS_VFY_POLICY & ~TS_VFY_NONCE & ~TS_VFY_TSA_NAME);
TS_VERIFY_CTX_set_store(ts_context, store);
TS_VERIFY_CTS_set_certs(ts_context, usedCertificates);
// Get timestamp and hash algorithm
if (TS_TST_INFO* info = PKCS7_to_TS_TST_INFO(pkcs7))
{
// Date/time of timestamp
const ASN1_GENERALIZEDTIME* time = TS_TST_INFO_get_time(info);
result.setTimestampDate(getDateTimeFromASN(time));
}
STACK_OF(PKCS7_SIGNER_INFO)* signerInfos = PKCS7_get_signer_info(pkcs7);
addHashAlgorithmFromSignerInfoStack(signerInfos, result);
addSignatureDateFromSignerInfoStack(signerInfos, result);
const int verifyValue = TS_RESP_verify_token(ts_context, pkcs7);
if (verifyValue <= 0)
{
const int reason = ERR_GET_REASON(ERR_get_error());
switch (reason)
{
case TS_R_MESSAGE_IMPRINT_MISMATCH:
result.addSignatureDigestFailureError();
break;
default:
result.addSignatureDataOtherError();
break;
}
}
// Finalization of verification context. Function TS_VERIFY_CTX_cleanup also
// frees all data, such as context, store, etc.
TS_VERIFY_CTX_cleanup(ts_context);
TS_VERIFY_CTX_free(ts_context);
}
else
{
// There is no need for adding error, error is in this case added by getSignedDataBuffer function
}
PKCS7_free(pkcs7);
}
else
{
result.addInvalidSignatureError();
}
if (!result.hasSignatureError())
{
result.setFlag(PDFSignatureVerificationResult::Signature_OK, true);
}
}
// This is protected by global mutex, but it is ugly
static PDFSignatureVerificationResult* s_ETSI_currentResult = nullptr;
int PDFSignatureHandler_ETSI_base::verifyCallback(int ok, X509_STORE_CTX* context)
{
const int errorCode = X509_STORE_CTX_get_error(context);
switch (errorCode)
{
case X509_V_ERR_CRL_NOT_YET_VALID:
case X509_V_ERR_CRL_HAS_EXPIRED:
{
// We will treat this as only warning
s_ETSI_currentResult->addCertificateCRLValidityTimeExpiredWarning();
X509_STORE_CTX_set_error(context, X509_V_OK);
return 1;
}
case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
{
// We must handle all critical extensions manually
X509* certificate = X509_STORE_CTX_get_current_cert(context);
const STACK_OF(X509_EXTENSION)* extensions = X509_get0_extensions(certificate);
for (int i = 0, extensionsCount = sk_X509_EXTENSION_num(extensions); i < extensionsCount; ++i)
{
X509_EXTENSION* extension = sk_X509_EXTENSION_value(extensions, i);
// Skip non-critical extensions
if (!X509_EXTENSION_get_critical(extension))
{
continue;
}
const ASN1_OBJECT* object = X509_EXTENSION_get_object(extension);
const int nid = OBJ_obj2nid(object);
switch (nid)
{
case NID_basic_constraints:
case NID_key_usage:
// These are handled by OpenSSL
continue;
case NID_qcStatements:
{
// We will treat this as only warning
s_ETSI_currentResult->addCertificateQualifiedStatementNotVerifiedWarning();
X509_STORE_CTX_set_error(context, X509_V_OK);
continue;
}
default:
return ok;
}
}
X509_STORE_CTX_set_error(context, X509_V_OK);
return 1;
}
default:
break;
}
return ok;
}
void PDFSignatureHandler_ETSI_base::verifyCertificateCAdES(PDFSignatureVerificationResult& result, int purpose) const
{
PDFOpenSSLGlobalLock lock;
s_ETSI_currentResult = &result;
OpenSSL_add_all_algorithms();
const PDFSignature& signature = m_signatureField->getSignature();
const QByteArray& content = signature.getContents();
// Jakub Melka: we will try to get pkcs7 from signature, then
// verify signer certificates.
const unsigned char* data = convertByteArrayToUcharPtr(content);
if (PKCS7* pkcs7 = d2i_PKCS7(nullptr, &data, content.size()))
{
X509_STORE* store = X509_STORE_new();
X509_STORE_CTX* context = X509_STORE_CTX_new();
// Above functions can fail only if not enough memory. But in this
// case, this library will crash anyway.
Q_ASSERT(store);
Q_ASSERT(context);
addTrustedCertificates(store);
STACK_OF(PKCS7_SIGNER_INFO)* signerInfo = PKCS7_get_signer_info(pkcs7);
const int signerInfoCount = sk_PKCS7_SIGNER_INFO_num(signerInfo);
STACK_OF(X509)* certificates = getCertificates(pkcs7);
if (signerInfo && signerInfoCount > 0 && certificates)
{
STACK_OF(X509)* allCertificates = nullptr;
if (m_parameters.dss && !m_parameters.dss->getMasterItem()->Cert.empty())
{
allCertificates = sk_X509_new_null();
// First, add all certificates from pkcs7
for (int i = 0; i < sk_X509_num(certificates); ++i)
{
sk_X509_push(allCertificates, sk_X509_value(certificates, i));
}
// Second, add all certificates from document's security store
for (const QByteArray& certificateData : m_parameters.dss->getMasterItem()->Cert)
{
const unsigned char* certificateDataBuffer = convertByteArrayToUcharPtr(certificateData);
if (X509* certificate = d2i_X509(nullptr, &certificateDataBuffer, certificateData.size()))
{
sk_X509_push(allCertificates, certificate);
}
}
}
STACK_OF(X509)* usedCertificates = allCertificates ? allCertificates : certificates;
// Jakub Melka: add certificate revocation lists
if (m_parameters.dss && !m_parameters.dss->getMasterItem()->CRL.empty())
{
for (const QByteArray& crlData : m_parameters.dss->getMasterItem()->CRL)
{
const unsigned char* crlDataBuffer = convertByteArrayToUcharPtr(crlData);
if (X509_CRL* crl = d2i_X509_CRL(nullptr, &crlDataBuffer, crlData.size()))
{
X509_STORE_add_crl(store, crl);
X509_CRL_free(crl);
}
}
}
for (int i = 0; i < signerInfoCount; ++i)
{
PKCS7_SIGNER_INFO* signerInfoValue = sk_PKCS7_SIGNER_INFO_value(signerInfo, i);
PKCS7_ISSUER_AND_SERIAL* issuerAndSerial = signerInfoValue->issuer_and_serial;
X509* signer = X509_find_by_issuer_and_serial(usedCertificates, issuerAndSerial->issuer, issuerAndSerial->serial);
if (!signer)
{
result.addCertificateMissingError();
break;
}
if (!X509_STORE_CTX_init(context, store, signer, usedCertificates))
{
result.addCertificateGenericError();
break;
}
if (!X509_STORE_CTX_set_purpose(context, purpose))
{
result.addCertificateGenericError();
break;
}
unsigned long flags = X509_V_FLAG_TRUSTED_FIRST | X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL | X509_V_FLAG_EXTENDED_CRL_SUPPORT;
if (m_parameters.ignoreExpirationDate)
{
flags |= X509_V_FLAG_NO_CHECK_TIME;
}
X509_STORE_CTX_set_flags(context, flags);
X509_STORE_CTX_set_verify_cb(context, &PDFSignatureHandler_ETSI_CAdES_detached::verifyCallback);
int verificationResult = X509_verify_cert(context);
if (verificationResult <= 0)
{
int error = X509_STORE_CTX_get_error(context);
switch (error)
{
case X509_V_OK:
// Strange, this should not occur... when X509_verify_cert fails
break;
case X509_V_ERR_CERT_HAS_EXPIRED:
result.addCertificateExpiredError();
break;
case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
result.addCertificateSelfSignedError();
break;
case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
result.addCertificateSelfSignedInChainError();
break;
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
result.addCertificateTrustedNotFoundError();
break;
case X509_V_ERR_CERT_REVOKED:
result.addCertificateRevokedError();
break;
default:
result.addCertificateOtherError(error);
break;
}
// We will add certificate info for all certificates
const int count = sk_X509_num(usedCertificates);
for (int i = 0; i < count; ++i)
{
result.addCertificateInfo(getCertificateInfo(sk_X509_value(usedCertificates, i)));
}
}
else
{
STACK_OF(X509)* validChain = X509_STORE_CTX_get0_chain(context);
const int count = sk_X509_num(validChain);
for (int i = 0; i < count; ++i)
{
result.addCertificateInfo(getCertificateInfo(sk_X509_value(validChain, i)));
}
}
X509_STORE_CTX_cleanup(context);
}
if (allCertificates)
{
for (int i = sk_X509_num(certificates); i < sk_X509_num(allCertificates); ++i)
{
X509_free(sk_X509_value(allCertificates, i));
}
sk_X509_free(allCertificates);
}
}
else
{
result.addNoSignaturesError();
}
X509_STORE_CTX_free(context);
X509_STORE_free(store);
PKCS7_free(pkcs7);
}
else
{
result.addInvalidCertificateError();
}
if (!result.hasCertificateError())
{
result.setFlag(PDFSignatureVerificationResult::Certificate_OK, true);
}
}
PDFSignatureVerificationResult PDFSignatureHandler_adbe_pkcs7_rsa_sha1::verify() const
{
PDFSignatureVerificationResult result;
initializeResult(result);
verifyRSACertificate(result);
verifyRSASignature(result);
result.validate();
return result;
}
X509* PDFSignatureHandler_adbe_pkcs7_rsa_sha1::createCertificate(size_t index) const
{
const PDFSignature& signature = m_signatureField->getSignature();
const std::vector<QByteArray>* certificates = signature.getCertificates();
if (certificates && index < certificates->size())
{
const QByteArray& certificateSize = (*certificates)[index];
const unsigned char* data = convertByteArrayToUcharPtr(certificateSize);
return d2i_X509(nullptr, &data, certificateSize.size());
}
return nullptr;
}
bool PDFSignatureHandler_adbe_pkcs7_rsa_sha1::getMessageDigest(const QByteArray& message,
ASN1_OCTET_STRING* encryptedString,
RSA* rsa,
int& algorithmNID,
QByteArray& digest) const
{
if (!getMessageDigestAlgorithm(encryptedString, rsa, algorithmNID))
{
return false;
}
if (const EVP_MD* md = EVP_get_digestbynid(algorithmNID))
{
unsigned int messageDigestSize = EVP_MD_size(md);
digest.resize(messageDigestSize);
EVP_MD_CTX* context = EVP_MD_CTX_new();
Q_ASSERT(context);
EVP_DigestInit(context, md);
EVP_DigestUpdate(context, message.constData(), message.size());
EVP_DigestFinal(context, convertByteArrayToUcharPtr(digest), &messageDigestSize);
EVP_MD_CTX_free(context);
return true;
}
return false;
}
bool PDFSignatureHandler_adbe_pkcs7_rsa_sha1::getMessageDigestAlgorithm(ASN1_OCTET_STRING* encryptedString,
RSA* rsa,
int& algorithmNID) const
{
algorithmNID = 0;
int size = RSA_size(rsa);
std::vector<unsigned char> decryptedBuffer(size, 0);
const int signatureSize = RSA_public_decrypt(encryptedString->length, encryptedString->data, decryptedBuffer.data(), rsa, RSA_PKCS1_PADDING);
if (signatureSize <= 0)
{
return false;
}
Q_ASSERT(signatureSize < decryptedBuffer.size());
const unsigned char* decryptedBufferPtr = decryptedBuffer.data();
if (X509_SIG* x509_sig = d2i_X509_SIG(nullptr, &decryptedBufferPtr, signatureSize))
{
const X509_ALGOR* algorithm = nullptr;
const ASN1_OBJECT* algorithmDescriptor = nullptr;
X509_SIG_get0(x509_sig, &algorithm, nullptr);
X509_ALGOR_get0(&algorithmDescriptor, nullptr, nullptr, algorithm);
algorithmNID = OBJ_obj2nid(algorithmDescriptor);
X509_SIG_free(x509_sig);
return true;
}
return false;
}
void PDFSignatureHandler_adbe_pkcs7_rsa_sha1::verifyRSACertificate(PDFSignatureVerificationResult& result) const
{
if (X509* certificate = createCertificate(0))
{
STACK_OF(X509)* certificates = sk_X509_new_null();
sk_X509_push(certificates, certificate);
for (size_t i = 1;; ++i)
{
if (X509* currentCertificate = createCertificate(i))
{
sk_X509_push(certificates, currentCertificate);
}
else
{
break;
}
}
X509_STORE* store = X509_STORE_new();
X509_STORE_CTX* context = X509_STORE_CTX_new();
// Above functions can fail only if not enough memory. But in this
// case, this library will crash anyway.
Q_ASSERT(store);
Q_ASSERT(context);
addTrustedCertificates(store);
X509* signer = certificate;
if (!X509_STORE_CTX_init(context, store, signer, certificates))
{
result.addCertificateGenericError();
}
if (!X509_STORE_CTX_set_purpose(context, X509_PURPOSE_SMIME_SIGN))
{
result.addCertificateGenericError();
}
if (!result.hasCertificateError())
{
unsigned long flags = X509_V_FLAG_TRUSTED_FIRST;
if (m_parameters.ignoreExpirationDate)
{
flags |= X509_V_FLAG_NO_CHECK_TIME;
}
X509_STORE_CTX_set_flags(context, flags);
int verificationResult = X509_verify_cert(context);
if (verificationResult <= 0)
{
int error = X509_STORE_CTX_get_error(context);
switch (error)
{
case X509_V_OK:
// Strange, this should not occur... when X509_verify_cert fails
break;
case X509_V_ERR_CERT_HAS_EXPIRED:
result.addCertificateExpiredError();
break;
case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
result.addCertificateSelfSignedError();
break;
case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
result.addCertificateSelfSignedInChainError();
break;
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
result.addCertificateTrustedNotFoundError();
break;
case X509_V_ERR_CERT_REVOKED:
result.addCertificateRevokedError();
break;
default:
result.addCertificateOtherError(error);
break;
}
// We will add certificate info for all certificates
const int count = sk_X509_num(certificates);
for (int i = 0; i < count; ++i)
{
result.addCertificateInfo(getCertificateInfo(sk_X509_value(certificates, i)));
}
}
else
{
STACK_OF(X509)* validChain = X509_STORE_CTX_get0_chain(context);
const int count = sk_X509_num(validChain);
for (int i = 0; i < count; ++i)
{
result.addCertificateInfo(getCertificateInfo(sk_X509_value(validChain, i)));
}
}
X509_STORE_CTX_cleanup(context);
}
X509_STORE_CTX_free(context);
X509_STORE_free(store);
sk_X509_pop_free(certificates, X509_free);
}
else
{
result.addInvalidCertificateError();
}
if (!result.hasCertificateError())
{
result.setFlag(PDFSignatureVerificationResult::Certificate_OK, true);
}
}
void PDFSignatureHandler_adbe_pkcs7_rsa_sha1::verifyRSASignature(PDFSignatureVerificationResult& result) const
{
// Jakub Melka: we will use first certificate to validate signature
X509* certificate = createCertificate(0);
if (!certificate)
{
result.addSignatureCertificateMissingError();
return;
}
EVP_PKEY* evpKey = X509_get0_pubkey(certificate);
if (!evpKey)
{
X509_free(certificate);
result.addSignatureCertificateMissingError();
return;
}
RSA* rsa = EVP_PKEY_get0_RSA(evpKey);
if (!rsa)
{
X509_free(certificate);
result.addSignatureCertificateMissingError();
return;
}
QByteArray outputBuffer;
if (BIO* bio = this->getSignedDataBuffer(result, outputBuffer))
{
const PDFSignature& signature = m_signatureField->getSignature();
const QByteArray& signKey = signature.getContents();
const unsigned char* encryptedSign = convertByteArrayToUcharPtr(signKey);
const unsigned int encryptedSignLength = signKey.length();
if (ASN1_OCTET_STRING* encryptedString = d2i_ASN1_OCTET_STRING(nullptr, &encryptedSign, encryptedSignLength))
{
int algorithmNID = NID_undef;
QByteArray digestBuffer;
if (!getMessageDigest(outputBuffer, encryptedString, rsa, algorithmNID, digestBuffer))
{
BIO_free(bio);
X509_free(certificate);
ASN1_OCTET_STRING_free(encryptedString);
result.addSignatureDataOtherError();
return;
}
const unsigned char* digest = convertByteArrayToUcharPtr(digestBuffer);
const unsigned int digestLength = digestBuffer.length();
std::array<char, 64> buffer = { };
OBJ_obj2txt(buffer.data(), int(buffer.size() - 1), OBJ_nid2obj(algorithmNID), 0);
result.addHashAlgorithm(QString::fromLatin1(buffer.data()));
const int verifyValue = RSA_verify(algorithmNID, digest, digestLength, encryptedString->data, encryptedString->length, rsa);
ASN1_OCTET_STRING_free(encryptedString);
if (verifyValue == 0)
{
// We have failed, probably due to invalid signature
const unsigned long errorCode = ERR_GET_REASON(ERR_get_error());
switch (errorCode)
{
case RSA_R_DIGEST_DOES_NOT_MATCH:
result.addSignatureDigestFailureError();
break;
default:
result.addSignatureDataOtherError();
break;
}
}
}
else
{
result.addSignatureDataOtherError();
}
BIO_free(bio);
}
X509_free(certificate);
if (!result.hasSignatureError())
{
result.setFlag(PDFSignatureVerificationResult::Signature_OK, true);
}
}
PDFSignatureVerificationResult PDFSignatureHandler_adbe_pkcs7_sha1::verify() const
{
PDFSignatureVerificationResult result;
initializeResult(result);
verifyCertificate(result);
verifySignature(result);
result.validate();
return result;
}
BIO* PDFSignatureHandler_adbe_pkcs7_sha1::getSignedDataBuffer(PDFSignatureVerificationResult& result, QByteArray& outputBuffer) const
{
QByteArray temporaryBuffer;
if (BIO* bio = PDFPublicKeySignatureHandler::getSignedDataBuffer(result, temporaryBuffer))
{
// Calculate SHA1
outputBuffer.resize(SHA_DIGEST_LENGTH);
SHA1(convertByteArrayToUcharPtr(temporaryBuffer), temporaryBuffer.length(), convertByteArrayToUcharPtr(outputBuffer));
BIO_free(bio);
return BIO_new_mem_buf(outputBuffer.data(), outputBuffer.length());
}
return nullptr;
}
PDFCertificateInfo PDFPublicKeySignatureHandler::getCertificateInfo(X509* certificate)
{
PDFCertificateInfo info;
if (X509_NAME* subjectName = X509_get_subject_name(certificate))
{
// List of these properties are in RFC 5280, section 4.1.2.4, these attributes
// are standard and all implementations must be prepared to process them.
QString countryName = getStringFromX509Name(subjectName, NID_countryName);
QString organizationName = getStringFromX509Name(subjectName, NID_organizationName);
QString organizationalUnitName = getStringFromX509Name(subjectName, NID_organizationalUnitName);
QString distinguishedName = getStringFromX509Name(subjectName, NID_distinguishedName);
QString stateOrProvinceName = getStringFromX509Name(subjectName, NID_stateOrProvinceName);
QString commonName = getStringFromX509Name(subjectName, NID_commonName);
QString serialNumber = getStringFromX509Name(subjectName, NID_serialNumber);
// These attributes are defined also in section 4.1.2.4, they are not mandatory,
// but application should be able to process them.
QString localityName = getStringFromX509Name(subjectName, NID_localityName);
QString title = getStringFromX509Name(subjectName, NID_title);
QString surname = getStringFromX509Name(subjectName, NID_surname);
QString givenName = getStringFromX509Name(subjectName, NID_givenName);
QString initials = getStringFromX509Name(subjectName, NID_initials);
QString pseudonym = getStringFromX509Name(subjectName, NID_pseudonym);
QString generationQualifier = getStringFromX509Name(subjectName, NID_generationQualifier);
// This entry is not defined in section 4.1.2.4, but is commonly used
QString email = getStringFromX509Name(subjectName, NID_pkcs9_emailAddress);
info.setName(PDFCertificateInfo::CountryName, qMove(countryName));
info.setName(PDFCertificateInfo::OrganizationName, qMove(organizationName));
info.setName(PDFCertificateInfo::OrganizationalUnitName, qMove(organizationalUnitName));
info.setName(PDFCertificateInfo::DistinguishedName, qMove(distinguishedName));
info.setName(PDFCertificateInfo::StateOrProvinceName, qMove(stateOrProvinceName));
info.setName(PDFCertificateInfo::CommonName, qMove(commonName));
info.setName(PDFCertificateInfo::SerialNumber, qMove(serialNumber));
info.setName(PDFCertificateInfo::LocalityName, qMove(localityName));
info.setName(PDFCertificateInfo::Title, qMove(title));
info.setName(PDFCertificateInfo::Surname, qMove(surname));
info.setName(PDFCertificateInfo::GivenName, qMove(givenName));
info.setName(PDFCertificateInfo::Initials, qMove(initials));
info.setName(PDFCertificateInfo::Pseudonym, qMove(pseudonym));
info.setName(PDFCertificateInfo::GenerationalQualifier, qMove(generationQualifier));
info.setName(PDFCertificateInfo::Email, qMove(email));
const long version = X509_get_version(certificate);
info.setVersion(version);
const ASN1_TIME* notBeforeTime = X509_get0_notBefore(certificate);
const ASN1_TIME* notAfterTime = X509_get0_notAfter(certificate);
info.setNotValidBefore(getDateTimeFromASN(notBeforeTime));
info.setNotValidAfter(getDateTimeFromASN(notAfterTime));
X509_PUBKEY* publicKey = X509_get_X509_PUBKEY(certificate);
EVP_PKEY* evpKey = X509_PUBKEY_get(publicKey);
const int keyType = EVP_PKEY_type(EVP_PKEY_base_id(evpKey));
PDFCertificateInfo::PublicKey key = PDFCertificateInfo::KeyUnknown;
switch (keyType)
{
case EVP_PKEY_RSA:
key = PDFCertificateInfo::KeyRSA;
break;
case EVP_PKEY_DSA:
key = PDFCertificateInfo::KeyDSA;
break;
case EVP_PKEY_DH:
key = PDFCertificateInfo::KeyDH;
break;
case EVP_PKEY_EC:
key = PDFCertificateInfo::KeyEC;
break;
default:
break;
}
info.setPublicKey(key);
const int bits = EVP_PKEY_bits(evpKey);
info.setKeySize(bits);
uint32_t keyUsage = X509_get_key_usage(certificate);
if (keyUsage != UINT32_MAX)
{
static_assert(PDFCertificateInfo::KeyUsageDigitalSignature == KU_DIGITAL_SIGNATURE, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageNonRepudiation == KU_NON_REPUDIATION, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageKeyEncipherment == KU_KEY_ENCIPHERMENT, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageDataEncipherment == KU_DATA_ENCIPHERMENT, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageAgreement == KU_KEY_AGREEMENT, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageCertSign == KU_KEY_CERT_SIGN, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageCrlSign == KU_CRL_SIGN, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageEncipherOnly == KU_ENCIPHER_ONLY, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageDecipherOnly == KU_DECIPHER_ONLY, "Fix this code!");
if (X509_get_extension_flags(certificate) & EXFLAG_XKUSAGE)
{
const uint32_t extendedKeyUsage = X509_get_extended_key_usage(certificate);
Q_ASSERT(extendedKeyUsage != UINT32_MAX);
static_assert(PDFCertificateInfo::KeyUsageExtended_SSL_SERVER >> 16 == XKU_SSL_SERVER, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageExtended_SSL_CLIENT >> 16 == XKU_SSL_CLIENT, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageExtended_SMIME >> 16 == XKU_SMIME, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageExtended_CODE_SIGN >> 16 == XKU_CODE_SIGN, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageExtended_SGC >> 16 == XKU_SGC, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageExtended_OCSP_SIGN >> 16 == XKU_OCSP_SIGN, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageExtended_TIMESTAMP >> 16 == XKU_TIMESTAMP, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageExtended_DVCS >> 16 == XKU_DVCS, "Fix this code!");
static_assert(PDFCertificateInfo::KeyUsageExtended_ANYEKU >> 16 == XKU_ANYEKU, "Fix this code!");
keyUsage = keyUsage | (extendedKeyUsage << 16);
}
info.setKeyUsage(static_cast<PDFCertificateInfo::KeyUsageFlags>(keyUsage));
}
unsigned char* buffer = nullptr;
int length = i2d_X509(certificate, &buffer);
if (length >= 0)
{
Q_ASSERT(buffer);
info.setCertificateData(QByteArray(reinterpret_cast<const char*>(buffer), length));
OPENSSL_free(buffer);
}
}
return info;
}
void PDFCertificateInfo::serialize(QDataStream& stream) const
{
stream << persist_version;
stream << m_version;
stream << m_keySize;
stream << m_publicKey;
stream << m_nameEntries;
stream << m_notValidBefore;
stream << m_notValidAfter;
stream << m_keyUsage;
stream << m_certificateData;
}
void PDFCertificateInfo::deserialize(QDataStream& stream)
{
int persist_version = 0;
stream >> persist_version;
stream >> m_version;
stream >> m_keySize;
stream >> m_publicKey;
stream >> m_nameEntries;
stream >> m_notValidBefore;
stream >> m_notValidAfter;
stream >> m_keyUsage;
stream >> m_certificateData;
}
QDateTime PDFCertificateInfo::getNotValidBefore() const
{
return m_notValidBefore;
}
void PDFCertificateInfo::setNotValidBefore(const QDateTime& notValidBefore)
{
m_notValidBefore = notValidBefore;
}
QDateTime PDFCertificateInfo::getNotValidAfter() const
{
return m_notValidAfter;
}
void PDFCertificateInfo::setNotValidAfter(const QDateTime& notValidAfter)
{
m_notValidAfter = notValidAfter;
}
int32_t PDFCertificateInfo::getVersion() const
{
return m_version;
}
void PDFCertificateInfo::setVersion(int32_t version)
{
m_version = version;
}
PDFCertificateInfo::PublicKey PDFCertificateInfo::getPublicKey() const
{
return m_publicKey;
}
void PDFCertificateInfo::setPublicKey(const PublicKey& publicKey)
{
m_publicKey = publicKey;
}
int PDFCertificateInfo::getKeySize() const
{
return m_keySize;
}
void PDFCertificateInfo::setKeySize(int keySize)
{
m_keySize = keySize;
}
PDFCertificateInfo::KeyUsageFlags PDFCertificateInfo::getKeyUsage() const
{
return m_keyUsage;
}
void PDFCertificateInfo::setKeyUsage(KeyUsageFlags keyUsage)
{
m_keyUsage = keyUsage;
}
std::optional<PDFCertificateInfo> PDFCertificateInfo::getCertificateInfo(const QByteArray& certificateData)
{
std::optional<PDFCertificateInfo> result;
PDFOpenSSLGlobalLock lock;
const unsigned char* data = convertByteArrayToUcharPtr(certificateData);
if (X509* certificate = d2i_X509(nullptr, &data, certificateData.length()))
{
result = PDFPublicKeySignatureHandler::getCertificateInfo(certificate);
X509_free(certificate);
}
return result;
}
QByteArray PDFCertificateInfo::getCertificateData() const
{
return m_certificateData;
}
void PDFCertificateInfo::setCertificateData(const QByteArray& certificateData)
{
m_certificateData = certificateData;
}
void PDFCertificateStore::CertificateEntry::serialize(QDataStream& stream) const
{
stream << persist_version;
stream << type;
stream << info;
}
void PDFCertificateStore::CertificateEntry::deserialize(QDataStream& stream)
{
int persist_version = 0;
stream >> persist_version;
stream >> type;
stream >> info;
}
QString PDFPublicKeySignatureHandler::getStringFromX509Name(X509_NAME* name, int nid)
{
QString result;
const int stringLocation = X509_NAME_get_index_by_NID(name, nid, -1);
X509_NAME_ENTRY* entry = X509_NAME_get_entry(name, stringLocation);
return getStringFromASN1_STRING(X509_NAME_ENTRY_get_data(entry));
}
QString pdf::PDFPublicKeySignatureHandler::getStringFromASN1_STRING(ASN1_STRING* string)
{
QString result;
if (string)
{
// Jakub Melka: we must convert entry to UTF8 encoding using function ASN1_STRING_to_UTF8
unsigned char* utf8Buffer = nullptr;
int errorCodeOrLength = ASN1_STRING_to_UTF8(&utf8Buffer, string);
if (errorCodeOrLength > 0)
{
result = QString::fromUtf8(reinterpret_cast<const char*>(utf8Buffer), errorCodeOrLength);
}
OPENSSL_free(utf8Buffer);
}
return result;
}
QDateTime PDFPublicKeySignatureHandler::getDateTimeFromASN(const ASN1_TIME* time)
{
QDateTime result;
if (time)
{
tm internalTime = { };
if (ASN1_TIME_to_tm(time, &internalTime) > 0)
{
time_t localTime = _mkgmtime(&internalTime);
result = QDateTime::fromSecsSinceEpoch(localTime, Qt::UTC);
}
}
return result;
}
void PDFPublicKeySignatureHandler::addHashAlgorithmFromSignerInfoStack(STACK_OF(PKCS7_SIGNER_INFO)* signerInfoStack, PDFSignatureVerificationResult& result)
{
if (!signerInfoStack)
{
// No signature info provided
return;
}
const int count = sk_PKCS7_SIGNER_INFO_num(signerInfoStack);
for (int i = 0; i < count; ++i)
{
PKCS7_SIGNER_INFO* signerInfoValue = sk_PKCS7_SIGNER_INFO_value(signerInfoStack, i);
if (signerInfoValue && signerInfoValue->digest_alg && signerInfoValue->digest_alg->algorithm)
{
std::array<char, 64> buffer = { };
OBJ_obj2txt(buffer.data(), int(buffer.size() - 1), signerInfoValue->digest_alg->algorithm, 0);
result.addHashAlgorithm(QString::fromLatin1(buffer.data()));
}
}
}
void PDFPublicKeySignatureHandler::addSignatureDateFromSignerInfoStack(STACK_OF(PKCS7_SIGNER_INFO)* signerInfoStack, PDFSignatureVerificationResult& result)
{
if (!signerInfoStack)
{
// No signature info provided
return;
}
if (sk_PKCS7_SIGNER_INFO_num(signerInfoStack) != 1)
{
// Multiple signature infos, or no signature info
return;
}
// Jakub Melka: We will get signed attribute from signer info.
PKCS7_SIGNER_INFO* signerInfo = sk_PKCS7_SIGNER_INFO_value(signerInfoStack, 0);
ASN1_TYPE* attribute = PKCS7_get_signed_attribute(signerInfo, NID_pkcs9_signingTime);
if (!attribute)
{
return;
}
switch (attribute->type)
{
case V_ASN1_UTCTIME:
result.setSignatureDate(getDateTimeFromASN(attribute->value.utctime));
break;
case V_ASN1_GENERALIZEDTIME:
result.setSignatureDate(getDateTimeFromASN(attribute->value.generalizedtime));
break;
default:
break;
}
}
void PDFCertificateStore::serialize(QDataStream& stream) const
{
stream << persist_version;
stream << m_certificates;
}
void PDFCertificateStore::deserialize(QDataStream& stream)
{
int persist_version = 0;
stream >> persist_version;
stream >> m_certificates;
}
bool PDFCertificateStore::add(EntryType type, const QByteArray& certificate)
{
if (auto certificateInfo = PDFCertificateInfo::getCertificateInfo(certificate))
{
return add(type, qMove(*certificateInfo));
}
return false;
}
bool PDFCertificateStore::add(EntryType type, PDFCertificateInfo info)
{
auto it = std::find_if(m_certificates.cbegin(), m_certificates.cend(), [&info](const auto& entry) { return entry.info == info; });
if (it == m_certificates.cend())
{
m_certificates.push_back({ type, qMove(info) });
}
return true;
}
bool PDFCertificateStore::contains(const PDFCertificateInfo& info)
{
return std::find_if(m_certificates.cbegin(), m_certificates.cend(), [&info](const auto& entry) { return entry.info == info; }) != m_certificates.cend();
}
QString PDFCertificateStore::getDefaultCertificateStoreFileName() const
{
return QStandardPaths::writableLocation(QStandardPaths::AppConfigLocation) + "/TrustedCertStorage.bin";
}
void PDFCertificateStore::loadDefaultUserCertificates()
{
createDirectoryForDefaultUserCertificatesStore();
QString trustedCertificateStoreFileName = getDefaultCertificateStoreFileName();
QString trustedCertificateStoreLockFileName = trustedCertificateStoreFileName + ".lock";
QLockFile lockFile(trustedCertificateStoreLockFileName);
if (lockFile.lock())
{
QFile trustedCertificateStoreFile(trustedCertificateStoreFileName);
if (trustedCertificateStoreFile.open(QFile::ReadOnly))
{
QDataStream stream(&trustedCertificateStoreFile);
deserialize(stream);
trustedCertificateStoreFile.close();
}
lockFile.unlock();
}
}
void PDFCertificateStore::saveDefaultUserCertificates()
{
createDirectoryForDefaultUserCertificatesStore();
QString trustedCertificateStoreFileName = getDefaultCertificateStoreFileName();
QString trustedCertificateStoreLockFileName = trustedCertificateStoreFileName + ".lock";
QFileInfo fileInfo(trustedCertificateStoreFileName);
QDir dir = fileInfo.dir();
dir.mkpath(dir.path());
QLockFile lockFile(trustedCertificateStoreLockFileName);
if (lockFile.lock())
{
QFile trustedCertificateStoreFile(trustedCertificateStoreFileName);
if (trustedCertificateStoreFile.open(QFile::WriteOnly | QFile::Truncate))
{
QDataStream stream(&trustedCertificateStoreFile);
serialize(stream);
trustedCertificateStoreFile.close();
}
lockFile.unlock();
}
}
void PDFCertificateStore::createDirectoryForDefaultUserCertificatesStore()
{
QFileInfo fileInfo(getDefaultCertificateStoreFileName());
QString path = fileInfo.path();
QDir().mkpath(path);
}
} // namespace pdf
#ifdef Q_OS_WIN
#include <Windows.h>
#include <wincrypt.h>
#pragma comment(lib, "crypt32.lib")
#endif
void pdf::PDFPublicKeySignatureHandler::addTrustedCertificates(X509_STORE* store) const
{
if (m_parameters.store)
{
const PDFCertificateStore::CertificateEntries& certificates = m_parameters.store->getCertificates();
for (const auto& entry : certificates)
{
QByteArray certificateData = entry.info.getCertificateData();
const unsigned char* pointer = convertByteArrayToUcharPtr(certificateData);
X509* certificate = d2i_X509(nullptr, &pointer, certificateData.length());
if (certificate)
{
X509_STORE_add_cert(store, certificate);
X509_free(certificate);
}
}
}
#ifdef Q_OS_WIN
if (m_parameters.useSystemCertificateStore)
{
HCERTSTORE certStore = CertOpenSystemStore(NULL, L"ROOT");
PCCERT_CONTEXT context = nullptr;
if (certStore)
{
while (context = CertEnumCertificatesInStore(certStore, context))
{
const unsigned char* pointer = context->pbCertEncoded;
X509* certificate = d2i_X509(nullptr, &pointer, context->cbCertEncoded);
if (certificate)
{
X509_STORE_add_cert(store, certificate);
X509_free(certificate);
}
}
CertCloseStore(certStore, CERT_CLOSE_STORE_FORCE_FLAG);
}
}
#endif
}
pdf::PDFCertificateStore::CertificateEntries pdf::PDFCertificateStore::getSystemCertificates()
{
CertificateEntries result;
#ifdef Q_OS_WIN
HCERTSTORE certStore = CertOpenSystemStore(NULL, L"ROOT");
PCCERT_CONTEXT context = nullptr;
if (certStore)
{
while (context = CertEnumCertificatesInStore(certStore, context))
{
const unsigned char* pointer = context->pbCertEncoded;
QByteArray data(reinterpret_cast<const char*>(pointer), context->cbCertEncoded);
std::optional<PDFCertificateInfo> info = PDFCertificateInfo::getCertificateInfo(data);
if (info)
{
CertificateEntry entry;
entry.type = EntryType::System;
entry.info = qMove(*info);
result.emplace_back(qMove(entry));
}
}
CertCloseStore(certStore, CERT_CLOSE_STORE_FORCE_FLAG);
}
#endif
return result;
}
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