From 77f30ada1156ca1e1357776fea8e9dc113f6898d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Caol=C3=A1n=20McNamara?= <caolanm@redhat.com>
Date: Thu, 3 Mar 2022 14:22:37 +0000
Subject: [PATCH 1/5] CVE-2022-26305 compare authors using Thumbprint

Change-Id: I338f58eb07cbf0a3d13a7dafdaddac09252a8546
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/130929
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
(cherry picked from commit 65442205b5b274ad309308162f150f8d41648f72)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/130866
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
(cherry picked from commit a7aaa78acea4c1d51283c2fce54ff9f5339026f8)
---
 .../component/documentdigitalsignatures.cxx   | 23 +++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/xmlsecurity/source/component/documentdigitalsignatures.cxx b/xmlsecurity/source/component/documentdigitalsignatures.cxx
index b9066ea92cac..5a21c8421bec 100644
--- a/xmlsecurity/source/component/documentdigitalsignatures.cxx
+++ b/xmlsecurity/source/component/documentdigitalsignatures.cxx
@@ -19,9 +19,10 @@
 
 #include <resourcemanager.hxx>
 
-#include <digitalsignaturesdialog.hxx>
+#include <certificate.hxx>
 #include <certificatechooser.hxx>
 #include <certificateviewer.hxx>
+#include <digitalsignaturesdialog.hxx>
 #include <macrosecurity.hxx>
 #include <biginteger.hxx>
 #include <strings.hrc>
@@ -666,9 +667,23 @@ sal_Bool DocumentDigitalSignatures::isAuthorTrusted(
     Sequence< SvtSecurityOptions::Certificate > aTrustedAuthors = SvtSecurityOptions().GetTrustedAuthors();
 
     return std::any_of(aTrustedAuthors.begin(), aTrustedAuthors.end(),
-        [&xAuthor, &sSerialNum](const SvtSecurityOptions::Certificate& rAuthor) {
-            return xmlsecurity::EqualDistinguishedNames(rAuthor[0], xAuthor->getIssuerName())
-                && ( rAuthor[1] == sSerialNum );
+        [this, &xAuthor, &sSerialNum](const SvtSecurityOptions::Certificate& rAuthor) {
+            if (!xmlsecurity::EqualDistinguishedNames(rAuthor[0], xAuthor->getIssuerName()))
+                return false;
+            if (rAuthor[1] != sSerialNum)
+                return false;
+
+            DocumentSignatureManager aSignatureManager(mxCtx, {});
+            if (!aSignatureManager.init())
+                return false;
+            uno::Reference<css::security::XCertificate> xCert = aSignatureManager.getSecurityEnvironment()->createCertificateFromAscii(rAuthor[2]);
+
+            auto pAuthor = dynamic_cast<xmlsecurity::Certificate*>(xAuthor.get());
+            auto pCert = dynamic_cast<xmlsecurity::Certificate*>(xCert.get());
+            if (pAuthor && pCert)
+                return pCert->getSHA256Thumbprint() == pAuthor->getSHA256Thumbprint();
+
+            return xCert->getSHA1Thumbprint() == xAuthor->getSHA1Thumbprint();
         });
 }
 
-- 
2.37.3