91ba9654ba
...so that its TOOLS_WARN_EXCEPTION can be used in comphelper/source/misc/logging.cxx in a follow-up commit. (And while at it, rename from diangose_ex.h to the more appropriate diagnose_ex.hxx. The comphelper module is sufficiently low-level for this immediate use case, so use that at least for now; o3tl might be even more suitable but doesn't have a Library until now. Also, for the immediate use case it would have sufficed to only break DbgGetCaughtException, exceptionToString, TOOLS_WARN_EXCEPTION, TOOLS_WARN_EXCEPTION_IF, and TOOLS_INFO_EXCEPTION out of include/tools/diagnose_ex.h into an additional new include/comphelper/diagnose_ex.hxx, but its probably easier overall to just move the complete include file as is.) Change-Id: I9f3222d4ccf1a9ac29d7eb9ba1530d53e2affaee Reviewed-on: https://gerrit.libreoffice.org/c/core/+/138451 Tested-by: Jenkins Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
626 lines
20 KiB
C++
626 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include <pdfsignaturehelper.hxx>
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#include <memory>
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#include <com/sun/star/io/XTruncate.hpp>
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#include <com/sun/star/io/XStream.hpp>
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#include <com/sun/star/security/CertificateValidity.hpp>
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#include <com/sun/star/uno/SecurityException.hpp>
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#include <com/sun/star/security/DocumentSignatureInformation.hpp>
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#include <com/sun/star/xml/crypto/XSecurityEnvironment.hpp>
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#include <com/sun/star/drawing/XShapes.hpp>
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#include <com/sun/star/frame/XModel.hpp>
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#include <com/sun/star/frame/XStorable.hpp>
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#include <com/sun/star/beans/XPropertySet.hpp>
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#include <com/sun/star/drawing/XDrawView.hpp>
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#include <comphelper/propertysequence.hxx>
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#include <sal/log.hxx>
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#include <comphelper/diagnose_ex.hxx>
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#include <unotools/mediadescriptor.hxx>
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#include <unotools/streamwrap.hxx>
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#include <unotools/ucbstreamhelper.hxx>
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#include <vcl/filter/pdfdocument.hxx>
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#include <vcl/checksum.hxx>
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#include <svl/cryptosign.hxx>
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#include <vcl/filter/PDFiumLibrary.hxx>
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using namespace ::com::sun::star;
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namespace
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{
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/// Gets the current page of the current view from xModel and puts it to the 1-based rPage.
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bool GetSignatureLinePage(const uno::Reference<frame::XModel>& xModel, sal_Int32& rPage)
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{
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uno::Reference<drawing::XDrawView> xController(xModel->getCurrentController(), uno::UNO_QUERY);
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if (!xController.is())
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{
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return false;
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}
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uno::Reference<beans::XPropertySet> xPage(xController->getCurrentPage(), uno::UNO_QUERY);
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if (!xPage.is())
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{
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return false;
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}
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return xPage->getPropertyValue("Number") >>= rPage;
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}
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/// If the currently selected shape is a Draw signature line, export that to PDF.
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void GetSignatureLineShape(const uno::Reference<frame::XModel>& xModel, sal_Int32& rPage,
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std::vector<sal_Int8>& rSignatureLineShape)
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{
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if (!xModel.is())
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{
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return;
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}
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if (!GetSignatureLinePage(xModel, rPage))
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{
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return;
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}
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uno::Reference<drawing::XShapes> xShapes(xModel->getCurrentSelection(), uno::UNO_QUERY);
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if (!xShapes.is() || xShapes->getCount() < 1)
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{
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return;
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}
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uno::Reference<beans::XPropertySet> xShapeProps(xShapes->getByIndex(0), uno::UNO_QUERY);
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if (!xShapeProps.is())
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{
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return;
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}
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comphelper::SequenceAsHashMap aMap(xShapeProps->getPropertyValue("InteropGrabBag"));
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auto it = aMap.find("SignatureCertificate");
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if (it == aMap.end())
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{
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return;
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}
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// We know that we add a signature line shape to an existing PDF at this point.
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uno::Reference<frame::XStorable> xStorable(xModel, uno::UNO_QUERY);
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if (!xStorable.is())
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{
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return;
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}
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// Export just the signature line.
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utl::MediaDescriptor aMediaDescriptor;
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aMediaDescriptor["FilterName"] <<= OUString("draw_pdf_Export");
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SvMemoryStream aStream;
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uno::Reference<io::XOutputStream> xStream(new utl::OStreamWrapper(aStream));
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aMediaDescriptor["OutputStream"] <<= xStream;
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uno::Sequence<beans::PropertyValue> aFilterData(
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comphelper::InitPropertySequence({ { "Selection", uno::Any(xShapes) } }));
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aMediaDescriptor["FilterData"] <<= aFilterData;
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xStorable->storeToURL("private:stream", aMediaDescriptor.getAsConstPropertyValueList());
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xStream->flush();
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aStream.Seek(0);
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rSignatureLineShape = std::vector<sal_Int8>(aStream.GetSize());
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aStream.ReadBytes(rSignatureLineShape.data(), rSignatureLineShape.size());
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}
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/// Represents a parsed signature.
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struct Signature
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{
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std::unique_ptr<vcl::pdf::PDFiumSignature> m_pSignature;
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/// Offset+length pairs.
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std::vector<std::pair<size_t, size_t>> m_aByteRanges;
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};
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/// Turns an array of floats into offset + length pairs.
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void GetByteRangesFromPDF(const std::unique_ptr<vcl::pdf::PDFiumSignature>& pSignature,
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std::vector<std::pair<size_t, size_t>>& rByteRanges)
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{
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std::vector<int> aByteRange = pSignature->getByteRange();
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if (aByteRange.empty())
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{
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SAL_WARN("xmlsecurity.helper", "GetByteRangesFromPDF: no byte ranges");
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return;
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}
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size_t nByteRangeOffset = 0;
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for (size_t i = 0; i < aByteRange.size(); ++i)
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{
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if (i % 2 == 0)
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{
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nByteRangeOffset = aByteRange[i];
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continue;
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}
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size_t nLength = aByteRange[i];
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rByteRanges.emplace_back(nByteRangeOffset, nLength);
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}
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}
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/// Determines the last position that is covered by a signature.
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bool GetEOFOfSignature(const Signature& rSignature, size_t& rEOF)
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{
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if (rSignature.m_aByteRanges.size() < 2)
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{
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return false;
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}
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rEOF = rSignature.m_aByteRanges[1].first + rSignature.m_aByteRanges[1].second;
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return true;
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}
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/**
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* Get the value of the "modification detection and prevention" permission:
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* Valid values are 1, 2 and 3: only 3 allows annotations after signing.
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*/
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int GetMDPPerm(const std::vector<Signature>& rSignatures)
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{
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int nRet = 3;
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if (rSignatures.empty())
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{
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return nRet;
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}
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for (const auto& rSignature : rSignatures)
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{
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int nPerm = rSignature.m_pSignature->getDocMDPPermission();
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if (nPerm != 0)
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{
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return nPerm;
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}
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}
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return nRet;
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}
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/// Checks if there are unsigned incremental updates between the signatures or after the last one.
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bool IsCompleteSignature(SvStream& rStream, const Signature& rSignature,
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const std::set<unsigned int>& rSignedEOFs,
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const std::vector<unsigned int>& rAllEOFs)
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{
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size_t nSignatureEOF = 0;
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if (!GetEOFOfSignature(rSignature, nSignatureEOF))
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{
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return false;
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}
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bool bFoundOwn = false;
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for (const auto& rEOF : rAllEOFs)
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{
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if (rEOF == nSignatureEOF)
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{
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bFoundOwn = true;
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continue;
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}
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if (!bFoundOwn)
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{
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continue;
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}
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if (rSignedEOFs.find(rEOF) == rSignedEOFs.end())
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{
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// Unsigned incremental update found.
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return false;
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}
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}
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// Make sure we find the incremental update of the signature itself.
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if (!bFoundOwn)
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{
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return false;
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}
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// No additional content after the last incremental update.
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rStream.Seek(STREAM_SEEK_TO_END);
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size_t nFileEnd = rStream.Tell();
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return std::find(rAllEOFs.begin(), rAllEOFs.end(), nFileEnd) != rAllEOFs.end();
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}
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/**
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* Contains checksums of a PDF page, which is rendered without annotations. It also contains
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* the geometry of a few dangerous annotation types.
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*/
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struct PageChecksum
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{
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BitmapChecksum m_nPageContent;
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std::vector<basegfx::B2DRectangle> m_aAnnotations;
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bool operator==(const PageChecksum& rChecksum) const;
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};
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bool PageChecksum::operator==(const PageChecksum& rChecksum) const
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{
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if (m_nPageContent != rChecksum.m_nPageContent)
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{
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return false;
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}
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return m_aAnnotations == rChecksum.m_aAnnotations;
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}
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/// Collects the checksum of each page of one version of the PDF.
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void AnalyizeSignatureStream(SvMemoryStream& rStream, std::vector<PageChecksum>& rPageChecksums,
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int nMDPPerm)
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{
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auto pPdfium = vcl::pdf::PDFiumLibrary::get();
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std::unique_ptr<vcl::pdf::PDFiumDocument> pPdfDocument
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= pPdfium->openDocument(rStream.GetData(), rStream.GetSize(), OString());
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if (!pPdfDocument)
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{
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return;
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}
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int nPageCount = pPdfDocument->getPageCount();
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for (int nPage = 0; nPage < nPageCount; ++nPage)
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{
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std::unique_ptr<vcl::pdf::PDFiumPage> pPdfPage = pPdfDocument->openPage(nPage);
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if (!pPdfPage)
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{
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return;
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}
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PageChecksum aPageChecksum;
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aPageChecksum.m_nPageContent = pPdfPage->getChecksum(nMDPPerm);
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for (int i = 0; i < pPdfPage->getAnnotationCount(); ++i)
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{
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std::unique_ptr<vcl::pdf::PDFiumAnnotation> pPdfAnnotation = pPdfPage->getAnnotation(i);
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if (!pPdfAnnotation)
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{
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SAL_WARN("xmlsecurity.helper", "Cannot get PDFiumAnnotation");
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continue;
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}
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vcl::pdf::PDFAnnotationSubType eType = pPdfAnnotation->getSubType();
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switch (eType)
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{
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case vcl::pdf::PDFAnnotationSubType::Unknown:
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case vcl::pdf::PDFAnnotationSubType::FreeText:
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case vcl::pdf::PDFAnnotationSubType::Stamp:
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case vcl::pdf::PDFAnnotationSubType::Redact:
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aPageChecksum.m_aAnnotations.push_back(pPdfAnnotation->getRectangle());
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break;
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default:
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break;
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}
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}
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rPageChecksums.push_back(aPageChecksum);
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}
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}
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/**
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* Checks if incremental updates after singing performed valid modifications only.
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* nMDPPerm decides if annotations/commenting is OK, other changes are always not.
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*/
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bool IsValidSignature(SvStream& rStream, const Signature& rSignature, int nMDPPerm)
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{
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size_t nSignatureEOF = 0;
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if (!GetEOFOfSignature(rSignature, nSignatureEOF))
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{
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return false;
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}
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SvMemoryStream aSignatureStream;
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sal_uInt64 nPos = rStream.Tell();
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rStream.Seek(0);
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aSignatureStream.WriteStream(rStream, nSignatureEOF);
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rStream.Seek(nPos);
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aSignatureStream.Seek(0);
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std::vector<PageChecksum> aSignedPages;
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AnalyizeSignatureStream(aSignatureStream, aSignedPages, nMDPPerm);
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SvMemoryStream aFullStream;
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nPos = rStream.Tell();
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rStream.Seek(0);
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aFullStream.WriteStream(rStream);
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rStream.Seek(nPos);
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aFullStream.Seek(0);
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std::vector<PageChecksum> aAllPages;
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AnalyizeSignatureStream(aFullStream, aAllPages, nMDPPerm);
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// Fail if any page looks different after signing and at the end. Annotations/commenting doesn't
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// count, though.
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return aSignedPages == aAllPages;
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}
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/**
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* @param rInformation The actual result.
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* @param rDocument the parsed document to see if the signature is partial.
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* @return If we can determinate a result.
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*/
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bool ValidateSignature(SvStream& rStream, const Signature& rSignature,
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SignatureInformation& rInformation, int nMDPPerm,
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const std::set<unsigned int>& rSignatureEOFs,
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const std::vector<unsigned int>& rTrailerEnds)
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{
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std::vector<unsigned char> aContents = rSignature.m_pSignature->getContents();
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if (aContents.empty())
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{
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SAL_WARN("xmlsecurity.helper", "ValidateSignature: no contents");
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return false;
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}
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OString aSubFilter = rSignature.m_pSignature->getSubFilter();
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const bool bNonDetached = aSubFilter == "adbe.pkcs7.sha1";
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if (aSubFilter.isEmpty()
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|| (aSubFilter != "adbe.pkcs7.detached" && !bNonDetached
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&& aSubFilter != "ETSI.CAdES.detached"))
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{
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if (aSubFilter.isEmpty())
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SAL_WARN("xmlsecurity.helper", "ValidateSignature: missing sub-filter");
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else
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SAL_WARN("xmlsecurity.helper",
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"ValidateSignature: unsupported sub-filter: '" << aSubFilter << "'");
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return false;
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}
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// Reason / comment / description is optional.
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rInformation.ouDescription = rSignature.m_pSignature->getReason();
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// Date: used only when the time of signing is not available in the
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// signature.
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rInformation.stDateTime = rSignature.m_pSignature->getTime();
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// Detect if the byte ranges don't cover everything, but the signature itself.
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if (rSignature.m_aByteRanges.size() < 2)
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{
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SAL_WARN("xmlsecurity.helper", "ValidateSignature: expected 2 byte ranges");
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return false;
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}
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if (rSignature.m_aByteRanges[0].first != 0)
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{
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SAL_WARN("xmlsecurity.helper", "ValidateSignature: first range start is not 0");
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return false;
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}
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// Binary vs hex dump and 2 is the leading "<" and the trailing ">" around the hex string.
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size_t nSignatureLength = aContents.size() * 2 + 2;
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if (rSignature.m_aByteRanges[1].first
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!= (rSignature.m_aByteRanges[0].second + nSignatureLength))
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{
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SAL_WARN("xmlsecurity.helper",
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"ValidateSignature: second range start is not the end of the signature");
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return false;
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}
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rInformation.bPartialDocumentSignature
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= !IsCompleteSignature(rStream, rSignature, rSignatureEOFs, rTrailerEnds);
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if (!IsValidSignature(rStream, rSignature, nMDPPerm))
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{
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SAL_WARN("xmlsecurity.helper", "ValidateSignature: invalid incremental update detected");
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return false;
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}
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// At this point there is no obviously missing info to validate the
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// signature.
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return svl::crypto::Signing::Verify(rStream, rSignature.m_aByteRanges, bNonDetached, aContents,
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rInformation);
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}
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}
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PDFSignatureHelper::PDFSignatureHelper() = default;
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bool PDFSignatureHelper::ReadAndVerifySignature(
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const uno::Reference<io::XInputStream>& xInputStream)
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{
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if (!xInputStream.is())
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{
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SAL_WARN("xmlsecurity.helper", "input stream missing");
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return false;
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}
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std::unique_ptr<SvStream> pStream(utl::UcbStreamHelper::CreateStream(xInputStream, true));
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return ReadAndVerifySignatureSvStream(*pStream);
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}
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bool PDFSignatureHelper::ReadAndVerifySignatureSvStream(SvStream& rStream)
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{
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auto pPdfium = vcl::pdf::PDFiumLibrary::get();
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if (!pPdfium)
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{
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return true;
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}
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SvMemoryStream aStream;
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sal_uInt64 nPos = rStream.Tell();
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rStream.Seek(0);
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aStream.WriteStream(rStream);
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rStream.Seek(nPos);
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std::unique_ptr<vcl::pdf::PDFiumDocument> pPdfDocument
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= pPdfium->openDocument(aStream.GetData(), aStream.GetSize(), OString());
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if (!pPdfDocument)
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{
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SAL_WARN("xmlsecurity.helper", "failed to read the document");
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return false;
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}
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int nSignatureCount = pPdfDocument->getSignatureCount();
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if (nSignatureCount <= 0)
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{
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return true;
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}
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std::vector<Signature> aSignatures(nSignatureCount);
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for (int i = 0; i < nSignatureCount; ++i)
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{
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std::unique_ptr<vcl::pdf::PDFiumSignature> pSignature = pPdfDocument->getSignature(i);
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std::vector<std::pair<size_t, size_t>> aByteRanges;
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GetByteRangesFromPDF(pSignature, aByteRanges);
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aSignatures[i] = Signature{ std::move(pSignature), aByteRanges };
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}
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std::set<unsigned int> aSignatureEOFs;
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for (const auto& rSignature : aSignatures)
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{
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size_t nEOF = 0;
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if (GetEOFOfSignature(rSignature, nEOF))
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{
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aSignatureEOFs.insert(nEOF);
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}
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}
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std::vector<unsigned int> aTrailerEnds = pPdfDocument->getTrailerEnds();
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m_aSignatureInfos.clear();
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int nMDPPerm = GetMDPPerm(aSignatures);
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for (size_t i = 0; i < aSignatures.size(); ++i)
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{
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SignatureInformation aInfo(i);
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if (!ValidateSignature(rStream, aSignatures[i], aInfo, nMDPPerm, aSignatureEOFs,
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aTrailerEnds))
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{
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SAL_WARN("xmlsecurity.helper", "failed to determine digest match");
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}
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m_aSignatureInfos.push_back(aInfo);
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}
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return true;
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}
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SignatureInformations const& PDFSignatureHelper::GetSignatureInformations() const
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{
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|
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());
|
|
auto aRetRange = asNonConstRange(aRet);
|
|
|
|
for (size_t i = 0; i < m_aSignatureInfos.size(); ++i)
|
|
{
|
|
const SignatureInformation& rInternal = m_aSignatureInfos[i];
|
|
security::DocumentSignatureInformation& rExternal = aRetRange[i];
|
|
rExternal.SignatureIsValid
|
|
= rInternal.nStatus == xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED;
|
|
if (rInternal.GetSigningCertificate()
|
|
&& !rInternal.GetSigningCertificate()->X509Certificate.isEmpty())
|
|
{
|
|
rExternal.Signer = xSecEnv->createCertificateFromAscii(
|
|
rInternal.GetSigningCertificate()->X509Certificate);
|
|
}
|
|
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<frame::XModel>& xModel,
|
|
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;
|
|
}
|
|
|
|
sal_Int32 nPage = 0;
|
|
std::vector<sal_Int8> aSignatureLineShape;
|
|
GetSignatureLineShape(xModel, nPage, aSignatureLineShape);
|
|
if (nPage > 0)
|
|
{
|
|
// UNO page number is 1-based.
|
|
aDocument.SetSignaturePage(nPage - 1);
|
|
}
|
|
if (!aSignatureLineShape.empty())
|
|
{
|
|
aDocument.SetSignatureLine(std::move(aSignatureLineShape));
|
|
}
|
|
|
|
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: */
|