[Libreoffice-commits] core.git: Branch 'distro/collabora/cp-6.4' - xmlsecurity/qa xmlsecurity/source
Miklos Vajna (via logerrit)
logerrit at kemper.freedesktop.org
Thu Nov 19 14:56:40 UTC 2020
xmlsecurity/qa/unit/pdfsigning/data/bad-cert-p3-stamp.pdf |binary
xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx | 16 +++
xmlsecurity/source/pdfio/pdfdocument.cxx | 63 ++++++++++++--
3 files changed, 74 insertions(+), 5 deletions(-)
New commits:
commit 6ebd3d7ec29fc5359df8a6206a82b9dc49322c77
Author: Miklos Vajna <vmiklos at collabora.com>
AuthorDate: Wed Nov 4 21:39:04 2020 +0100
Commit: Miklos Vajna <vmiklos at collabora.com>
CommitDate: Thu Nov 19 15:56:05 2020 +0100
xmlsecurity: reject a few dangerous annotation types during pdf sig verify
(cherry picked from commit f231dacde9df1c4aa5f4e0970535c4f4093364a7)
Conflicts:
include/vcl/filter/PDFiumLibrary.hxx
xmlsecurity/source/helper/pdfsignaturehelper.cxx
xmlsecurity/source/pdfio/pdfdocument.cxx
Change-Id: I950b49a6e7181639daf27348ddfa0f36586baa65
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/106170
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice at gmail.com>
Reviewed-by: Miklos Vajna <vmiklos at collabora.com>
diff --git a/xmlsecurity/qa/unit/pdfsigning/data/bad-cert-p3-stamp.pdf b/xmlsecurity/qa/unit/pdfsigning/data/bad-cert-p3-stamp.pdf
new file mode 100644
index 000000000000..b30f5b03867c
Binary files /dev/null and b/xmlsecurity/qa/unit/pdfsigning/data/bad-cert-p3-stamp.pdf differ
diff --git a/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx b/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx
index e7d005c815cb..248a2e4af45b 100644
--- a/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx
+++ b/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx
@@ -425,6 +425,22 @@ CPPUNIT_TEST_FIXTURE(PDFSigningTest, testBadCertP1)
rInformation.nStatus);
}
+CPPUNIT_TEST_FIXTURE(PDFSigningTest, testBadCertP3Stamp)
+{
+ std::vector<SignatureInformation> aInfos
+ = verify(m_directories.getURLFromSrc(DATA_DIRECTORY) + "bad-cert-p3-stamp.pdf", 1,
+ /*rExpectedSubFilter=*/OString());
+ CPPUNIT_ASSERT(!aInfos.empty());
+ SignatureInformation& rInformation = aInfos[0];
+
+ // Without the accompanying fix in place, this test would have failed with:
+ // - Expected: 0 (SecurityOperationStatus_UNKNOWN)
+ // - Actual : 1 (SecurityOperationStatus_OPERATION_SUCCEEDED)
+ // i.e. adding a stamp annotation was not considered as a bad modification.
+ CPPUNIT_ASSERT_EQUAL(xml::crypto::SecurityOperationStatus::SecurityOperationStatus_UNKNOWN,
+ rInformation.nStatus);
+}
+
/// Test writing a PAdES signature.
CPPUNIT_TEST_FIXTURE(PDFSigningTest, testSigningCertificateAttribute)
{
diff --git a/xmlsecurity/source/pdfio/pdfdocument.cxx b/xmlsecurity/source/pdfio/pdfdocument.cxx
index 7683a4cd71ee..caf744299ba6 100644
--- a/xmlsecurity/source/pdfio/pdfdocument.cxx
+++ b/xmlsecurity/source/pdfio/pdfdocument.cxx
@@ -24,6 +24,11 @@
#include <svl/cryptosign.hxx>
#include <vcl/filter/pdfdocument.hxx>
#include <vcl/bitmap.hxx>
+#include <basegfx/range/b2drectangle.hxx>
+
+#if HAVE_FEATURE_PDFIUM
+#include <fpdf_annot.h>
+#endif
using namespace com::sun::star;
@@ -138,8 +143,29 @@ bool IsCompleteSignature(SvStream& rStream, vcl::filter::PDFDocument& rDocument,
return std::find(rAllEOFs.begin(), rAllEOFs.end(), nFileEnd) != rAllEOFs.end();
}
+/**
+ * Contains checksums of a PDF page, which is rendered without annotations. It also contains
+ * the geometry of a few dangerous annotation types.
+ */
+struct PageChecksum
+{
+ BitmapChecksum m_nPageContent;
+ std::vector<basegfx::B2DRectangle> m_aAnnotations;
+ bool operator==(const PageChecksum& rChecksum) const;
+};
+
+bool PageChecksum::operator==(const PageChecksum& rChecksum) const
+{
+ if (m_nPageContent != rChecksum.m_nPageContent)
+ {
+ return false;
+ }
+
+ return m_aAnnotations == rChecksum.m_aAnnotations;
+}
+
/// Collects the checksum of each page of one version of the PDF.
-void AnalyizeSignatureStream(SvMemoryStream& rStream, std::vector<BitmapChecksum>& rPageChecksums,
+void AnalyizeSignatureStream(SvMemoryStream& rStream, std::vector<PageChecksum>& rPageChecksums,
int nMDPPerm)
{
#if HAVE_FEATURE_PDFIUM
@@ -156,8 +182,35 @@ void AnalyizeSignatureStream(SvMemoryStream& rStream, std::vector<BitmapChecksum
return;
}
- BitmapChecksum nPageChecksum = pPdfPage->getChecksum(nMDPPerm);
- rPageChecksums.push_back(nPageChecksum);
+ PageChecksum aPageChecksum;
+ aPageChecksum.m_nPageContent = pPdfPage->getChecksum(nMDPPerm);
+ for (int i = 0; i < FPDFPage_GetAnnotCount(pPdfPage->getPointer()); ++i)
+ {
+ FPDF_ANNOTATION pAnnotation = FPDFPage_GetAnnot(pPdfPage->getPointer(), i);
+ int nType = FPDFAnnot_GetSubtype(pAnnotation);
+ switch (nType)
+ {
+ case FPDF_ANNOT_UNKNOWN:
+ case FPDF_ANNOT_FREETEXT:
+ case FPDF_ANNOT_STAMP:
+ case FPDF_ANNOT_REDACT:
+ {
+ basegfx::B2DRectangle aB2DRectangle;
+ FS_RECTF aRect;
+ if (FPDFAnnot_GetRect(pAnnotation, &aRect))
+ {
+ aB2DRectangle = basegfx::B2DRectangle(aRect.left, aRect.top, aRect.right,
+ aRect.bottom);
+ }
+ aPageChecksum.m_aAnnotations.push_back(aB2DRectangle);
+ break;
+ }
+ default:
+ break;
+ }
+ FPDFPage_CloseAnnot(pAnnotation);
+ }
+ rPageChecksums.push_back(aPageChecksum);
}
#else
(void)rStream;
@@ -183,7 +236,7 @@ bool IsValidSignature(SvStream& rStream, vcl::filter::PDFObjectElement* pSignatu
aSignatureStream.WriteStream(rStream, nSignatureEOF);
rStream.Seek(nPos);
aSignatureStream.Seek(0);
- std::vector<BitmapChecksum> aSignedPages;
+ std::vector<PageChecksum> aSignedPages;
AnalyizeSignatureStream(aSignatureStream, aSignedPages, nMDPPerm);
SvMemoryStream aFullStream;
@@ -192,7 +245,7 @@ bool IsValidSignature(SvStream& rStream, vcl::filter::PDFObjectElement* pSignatu
aFullStream.WriteStream(rStream);
rStream.Seek(nPos);
aFullStream.Seek(0);
- std::vector<BitmapChecksum> aAllPages;
+ std::vector<PageChecksum> aAllPages;
AnalyizeSignatureStream(aFullStream, aAllPages, nMDPPerm);
// Fail if any page looks different after signing and at the end. Annotations/commenting doesn't
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