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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include <pdfsignaturehelper.hxx>
#include <memory>
#include <com/sun/star/io/XTruncate.hpp>
#include <com/sun/star/io/XStream.hpp>
#include <com/sun/star/security/CertificateValidity.hpp>
#include <com/sun/star/uno/SecurityException.hpp>
#include <com/sun/star/security/DocumentSignatureInformation.hpp>
#include <com/sun/star/xml/crypto/XSecurityEnvironment.hpp>
#include <unotools/ucbstreamhelper.hxx>
#include <vcl/filter/pdfdocument.hxx>
#include <pdfio/pdfdocument.hxx>
#include <tools/diagnose_ex.h>
#include <sal/log.hxx>
using namespace ::com::sun::star;
PDFSignatureHelper::PDFSignatureHelper() = default;
bool PDFSignatureHelper::ReadAndVerifySignature(
const uno::Reference<io::XInputStream>& xInputStream)
{
if (!xInputStream.is())
{
SAL_WARN("xmlsecurity.helper", "input stream missing");
return false;
}
std::unique_ptr<SvStream> pStream(utl::UcbStreamHelper::CreateStream(xInputStream, true));
vcl::filter::PDFDocument aDocument;
if (!aDocument.Read(*pStream))
{
SAL_WARN("xmlsecurity.helper", "failed to read the document");
return false;
}
std::vector<vcl::filter::PDFObjectElement*> aSignatures = aDocument.GetSignatureWidgets();
if (aSignatures.empty())
return true;
m_aSignatureInfos.clear();
int nMDPPerm = aDocument.GetMDPPerm();
for (size_t i = 0; i < aSignatures.size(); ++i)
{
SignatureInformation aInfo(i);
if (!xmlsecurity::pdfio::ValidateSignature(*pStream, aSignatures[i], aInfo, aDocument,
nMDPPerm))
SAL_WARN("xmlsecurity.helper", "failed to determine digest match");
m_aSignatureInfos.push_back(aInfo);
}
return true;
}
SignatureInformations const& PDFSignatureHelper::GetSignatureInformations() const
{
return m_aSignatureInfos;
}
uno::Sequence<security::DocumentSignatureInformation>
PDFSignatureHelper::GetDocumentSignatureInformations(
const uno::Reference<xml::crypto::XSecurityEnvironment>& xSecEnv) const
{
uno::Sequence<security::DocumentSignatureInformation> aRet(m_aSignatureInfos.size());
for (size_t i = 0; i < m_aSignatureInfos.size(); ++i)
{
const SignatureInformation& rInternal = m_aSignatureInfos[i];
security::DocumentSignatureInformation& rExternal = aRet[i];
rExternal.SignatureIsValid
= rInternal.nStatus == xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED;
if (!rInternal.ouX509Certificate.isEmpty())
rExternal.Signer = xSecEnv->createCertificateFromAscii(rInternal.ouX509Certificate);
rExternal.PartialDocumentSignature = rInternal.bPartialDocumentSignature;
// Verify certificate.
if (rExternal.Signer.is())
{
try
{
rExternal.CertificateStatus = xSecEnv->verifyCertificate(rExternal.Signer, {});
}
catch (const uno::SecurityException&)
{
DBG_UNHANDLED_EXCEPTION("xmlsecurity.helper", "failed to verify certificate");
rExternal.CertificateStatus = security::CertificateValidity::INVALID;
}
}
else
rExternal.CertificateStatus = security::CertificateValidity::INVALID;
}
return aRet;
}
sal_Int32 PDFSignatureHelper::GetNewSecurityId() const { return m_aSignatureInfos.size(); }
void PDFSignatureHelper::SetX509Certificate(
const uno::Reference<security::XCertificate>& xCertificate)
{
m_xCertificate = xCertificate;
}
void PDFSignatureHelper::SetDescription(const OUString& rDescription)
{
m_aDescription = rDescription;
}
bool PDFSignatureHelper::Sign(const uno::Reference<io::XInputStream>& xInputStream, bool bAdES)
{
std::unique_ptr<SvStream> pStream(utl::UcbStreamHelper::CreateStream(xInputStream, true));
vcl::filter::PDFDocument aDocument;
if (!aDocument.Read(*pStream))
{
SAL_WARN("xmlsecurity.helper", "failed to read the document");
return false;
}
if (!aDocument.Sign(m_xCertificate, m_aDescription, bAdES))
{
SAL_WARN("xmlsecurity.helper", "failed to sign");
return false;
}
uno::Reference<io::XStream> xStream(xInputStream, uno::UNO_QUERY);
std::unique_ptr<SvStream> pOutStream(utl::UcbStreamHelper::CreateStream(xStream, true));
if (!aDocument.Write(*pOutStream))
{
SAL_WARN("xmlsecurity.helper", "failed to write signed data");
return false;
}
return true;
}
bool PDFSignatureHelper::RemoveSignature(const uno::Reference<io::XInputStream>& xInputStream,
sal_uInt16 nPosition)
{
std::unique_ptr<SvStream> pStream(utl::UcbStreamHelper::CreateStream(xInputStream, true));
vcl::filter::PDFDocument aDocument;
if (!aDocument.Read(*pStream))
{
SAL_WARN("xmlsecurity.helper", "failed to read the document");
return false;
}
if (!aDocument.RemoveSignature(nPosition))
{
SAL_WARN("xmlsecurity.helper", "failed to remove signature");
return false;
}
uno::Reference<io::XStream> xStream(xInputStream, uno::UNO_QUERY);
uno::Reference<io::XTruncate> xTruncate(xStream, uno::UNO_QUERY);
if (!xTruncate.is())
{
SAL_WARN("xmlsecurity.helper", "failed to truncate");
return false;
}
xTruncate->truncate();
std::unique_ptr<SvStream> pOutStream(utl::UcbStreamHelper::CreateStream(xStream, true));
if (!aDocument.Write(*pOutStream))
{
SAL_WARN("xmlsecurity.helper", "failed to write without signature");
return false;
}
return true;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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