xmlsecurity: fix new tests on WNT

Tests added in commit 40d70d427edddb589eda64fafc2e56536953d274 don't
actually run on WNT but that wasn't obvious because commit
149df1fec6472e30582162e17e04c75aee91d26a prevented running them in
Jenkins on master, they failed only in the libreoffice-7-1 backport.

  xmlsecurity/qa/unit/signing/signing.cxx(631) : error : Assertion
  Test name: testODFDoubleX509Certificate::TestBody
  assertion failed
  - Expression: (nActual == SignatureState::NOTVALIDATED || nActual == SignatureState::OK)
  - 2

This is an oddity where NSS claims the signature in the document is
valid but CryptoAPI claims it is invalid; the hashes passed into the
validation functions are the same.  Just allow BROKEN as an additional
result value on WNT.

  xmlsecurity/qa/unit/signing/signing.cxx(550) : error : Assertion
  Test name: testODFX509CertificateChain::TestBody
  equality assertion failed
  - Expected: 0
  - Actual  : 1

The problem here is that with NSS the tests use a custom NSS database
in test/signing-keys so we need to make these certificates available for
CryptoAPI too.

The following one-liner converts the NSS database to a PKCS#7 that can
be loaded by CrytpAPI:

> openssl crl2pkcs7 -nocrl -certfile <(certutil -d sql:test/signing-keys -L | awk '/^[^ ].*,[^ ]*,/ { printf "%s", $1; for (i = 2; i < NF; i++) { printf " %s", $i; } printf "\n"; }' | while read name; do certutil -L -d sql:test/signing-keys -a -n "${name}" ; done) > test/signing-keys/test.p7b

Then one might naively assume that something like this would allow these
certificates to be added temporarily as trusted CAs:

+                HCERTSTORE hRoot = CertOpenSystemStoreW( 0, L"Root" ) ;
+                HCERTSTORE const hExtra = CertOpenStore(
+                        CERT_STORE_PROV_FILENAME_A,
+                        PKCS_7_ASN_ENCODING | X509_ASN_ENCODING,
+                        NULL,
+                        CERT_STORE_OPEN_EXISTING_FLAG | CERT_STORE_READONLY_FLAG,
+                        path);
+                if (hExtra != NULL && hRoot != NULL)
+                {
+                    BOOL ret = CertAddStoreToCollection(
+                        hRoot,
+                        hExtra,
+                        CERT_PHYSICAL_STORE_ADD_ENABLE_FLAG,
+                        0);
+                    SAL_DEBUG("XXX hExtra done " << ret);
+                }

There is no error from this, but it doesn't work.

Instead, check if CertGetCertificateChain() sets the
CERT_TRUST_IS_UNTRUSTED_ROOT flag and then look up the certificate
manually in the extra PKCS#7 store.

Reviewed-on: https://gerrit.libreoffice.org/c/core/+/123667
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
(cherry picked from commit 7d664ec788acdc378506a7ff8b1120cea24a6770)

Change-Id: Ic9865e0b5783211c2128ce0327c4583b7784ff62
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/123836
Tested-by: Michael Stahl <michael.stahl@allotropia.de>
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

4 files changed, 340 insertions, 9 deletions

diff --git a/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx b/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx
index 20241f016d52..1d45d5bef16b 100644
--- a/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx
+++ b/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx
@@ -12,6 +12,7 @@
 
 #include <comphelper/processfactory.hxx>
 #include <osl/file.hxx>
+#include <osl/process.h>
 #include <sal/log.hxx>
 #include <test/bootstrapfixture.hxx>
 #include <tools/datetime.hxx>
@@ -66,15 +67,21 @@ void PDFSigningTest::setUp()
 
     mxComponentContext.set(comphelper::getComponentContext(getMultiServiceFactory()));
 
-#ifndef _WIN32
-    // Set up cert8.db and key3.db in workdir/CppunitTest/
     OUString aSourceDir = m_directories.getURLFromSrc(DATA_DIRECTORY);
     OUString aTargetDir
         = m_directories.getURLFromWorkdir("/CppunitTest/xmlsecurity_pdfsigning.test.user/");
-    osl::File::copy(aSourceDir + "cert8.db", aTargetDir + "cert8.db");
-    osl::File::copy(aSourceDir + "key3.db", aTargetDir + "key3.db");
     OUString aTargetPath;
     osl::FileBase::getSystemPathFromFileURL(aTargetDir, aTargetPath);
+
+#ifdef _WIN32
+    // CryptoAPI test certificates
+    osl::File::copy(aSourceDir + "test.p7b", aTargetDir + "/test.p7b");
+    OUString caVar("LIBO_TEST_CRYPTOAPI_PKCS7");
+    osl_setEnvironment(caVar.pData, aTargetPath.pData);
+#else
+    // Set up cert8.db and key3.db in workdir/CppunitTest/
+    osl::File::copy(aSourceDir + "cert8.db", aTargetDir + "cert8.db");
+    osl::File::copy(aSourceDir + "key3.db", aTargetDir + "key3.db");
     setenv("MOZILLA_CERTIFICATE_FOLDER", aTargetPath.toUtf8().getStr(), 1);
 #endif
 }
diff --git a/xmlsecurity/qa/unit/signing/data/test.p7b b/xmlsecurity/qa/unit/signing/data/test.p7b
new file mode 100644
index 000000000000..44723697a2bf
--- /dev/null
+++ b/xmlsecurity/qa/unit/signing/data/test.p7b
@@ -0,0 +1,249 @@
+-----BEGIN PKCS7-----
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+Y3U3LDo+kQfo7hfVZ/HdrhK7ldhXbz7nMQA=
+-----END PKCS7-----
diff --git a/xmlsecurity/qa/unit/signing/signing.cxx b/xmlsecurity/qa/unit/signing/signing.cxx
index ad80c13955e9..3aea9fef8ccb 100644
--- a/xmlsecurity/qa/unit/signing/signing.cxx
+++ b/xmlsecurity/qa/unit/signing/signing.cxx
@@ -115,8 +115,15 @@ void SigningTest::setUp()
     OUString aTargetPath;
     osl::FileBase::getSystemPathFromFileURL(aTargetDir, aTargetPath);
 
+#ifdef _WIN32
+    // CryptoAPI test certificates
+    osl::File::copy(aSourceDir + "test.p7b", aTargetDir + "/test.p7b");
+    OUString caVar("LIBO_TEST_CRYPTOAPI_PKCS7");
+    osl_setEnvironment(caVar.pData, aTargetPath.pData);
+#else
     OUString mozCertVar("MOZILLA_CERTIFICATE_FOLDER");
     osl_setEnvironment(mozCertVar.pData, aTargetPath.pData);
+#endif
     OUString gpgHomeVar("GNUPGHOME");
     osl_setEnvironment(gpgHomeVar.pData, aTargetPath.pData);
 
@@ -601,7 +608,8 @@ CPPUNIT_TEST_FIXTURE(SigningTest, testODFX509CertificateChain)
     CPPUNIT_ASSERT(infos[0].Signer.is());
     CPPUNIT_ASSERT_EQUAL(
         OUString("CN=Xmlsecurity RSA Test example Alice,O=Xmlsecurity RSA Test,ST=England,C=UK"),
-        infos[0].Signer->getSubjectName());
+        // CryptoAPI puts a space after comma, NSS does not...
+        infos[0].Signer->getSubjectName().replaceAll(", ", ","));
 }
 
 CPPUNIT_TEST_FIXTURE(SigningTest, testODFDoubleX509Data)
@@ -670,9 +678,15 @@ CPPUNIT_TEST_FIXTURE(SigningTest, testODFDoubleX509Certificate)
     SfxObjectShell* pObjectShell = pBaseModel->GetObjectShell();
     CPPUNIT_ASSERT(pObjectShell);
     SignatureState nActual = pObjectShell->GetDocumentSignatureState();
-    CPPUNIT_ASSERT_MESSAGE(
-        (OString::number(o3tl::underlyingEnumValue(nActual)).getStr()),
-        (nActual == SignatureState::NOTVALIDATED || nActual == SignatureState::OK));
+    bool const nTemp((nActual == SignatureState::NOTVALIDATED
+                      || nActual == SignatureState::OK
+#if defined(_WIN32)
+                      // oddly BCryptVerifySignature returns STATUS_INVALID_SIGNATURE
+                      // while the same succeeds with NSS _SGN_VerifyPKCS1DigestInfo
+                      || nActual == SignatureState::BROKEN
+#endif
+                      ));
+    CPPUNIT_ASSERT_MESSAGE((OString::number(o3tl::underlyingEnumValue(nActual)).getStr()), nTemp);
     uno::Sequence<security::DocumentSignatureInformation> const infos(
         pObjectShell->GetDocumentSignatureInformation(false));
     CPPUNIT_ASSERT_EQUAL(sal_Int32(1), infos.getLength());
diff --git a/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx b/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx
index 4031df289f44..554802cdcf08 100644
--- a/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx
+++ b/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx
@@ -747,6 +747,61 @@ static HCERTSTORE getCertStoreForIntermediatCerts(
     return store;
 }
 
+static bool CheckUnitTestStore(PCCERT_CHAIN_CONTEXT const pChainContext, DWORD ignoreFlags)
+{
+    bool ret = false;
+    OUString const v("LIBO_TEST_CRYPTOAPI_PKCS7");
+    OUString var;
+    if (osl_Process_E_None != osl_getEnvironment(v.pData, &var.pData))
+    {
+        return ret;
+    }
+    if (pChainContext->cChain == 0)
+    {
+        return ret;
+    }
+    PCERT_SIMPLE_CHAIN pSimpleChain = pChainContext->rgpChain[0];
+    // check if untrusted root is the only problem
+    if (pSimpleChain->TrustStatus.dwErrorStatus & ~(CERT_TRUST_IS_UNTRUSTED_ROOT | ignoreFlags))
+    {
+        return ret;
+    }
+
+    // leak this store, re-opening is a waste of time in tests
+    static HCERTSTORE const hExtra = CertOpenStore(
+            CERT_STORE_PROV_FILENAME,
+            PKCS_7_ASN_ENCODING | X509_ASN_ENCODING,
+            NULL,
+            CERT_STORE_OPEN_EXISTING_FLAG | CERT_STORE_READONLY_FLAG,
+            OUString(var + "/test.p7b").getStr());
+    assert(hExtra != NULL);
+    if (pSimpleChain->cElement < 1)
+    {
+        SAL_WARN("xmlsecurity.xmlsec", "unexpected empty chain");
+        return ret;
+    }
+    PCCERT_CONTEXT const pRoot(pSimpleChain->rgpElement[pSimpleChain->cElement-1]->pCertContext);
+    PCCERT_CONTEXT const pIssuerCert = CertFindCertificateInStore(
+            hExtra,
+            PKCS_7_ASN_ENCODING | X509_ASN_ENCODING,
+            0,
+            CERT_FIND_SUBJECT_NAME,
+            &pRoot->pCertInfo->Subject,
+            NULL);
+    if (pIssuerCert)
+    {
+        // check that it signed itself
+        DWORD flags = CERT_STORE_SIGNATURE_FLAG;
+        BOOL result = CertVerifySubjectCertificateContext(pRoot, pIssuerCert, &flags);
+        if (result == TRUE && flags == 0)
+        {
+            ret = true;
+        }
+    }
+    CertFreeCertificateContext(pIssuerCert);
+    return ret;
+}
+
 //We return only valid or invalid, as long as the API documentation expresses
 //explicitly that all validation steps are carried out even if one or several
 //errors occur. See also
@@ -849,7 +904,8 @@ sal_Int32 SecurityEnvironment_MSCryptImpl::verifyCertificate(
             DWORD revocationFlags = CERT_TRUST_REVOCATION_STATUS_UNKNOWN |
                 CERT_TRUST_IS_OFFLINE_REVOCATION;
             DWORD otherErrorsMask = ~revocationFlags;
-            if( !(pSimpleChain->TrustStatus.dwErrorStatus & otherErrorsMask))
+            if (!(pSimpleChain->TrustStatus.dwErrorStatus & otherErrorsMask)
+                || CheckUnitTestStore(pChainContext, revocationFlags))
 
             {
                 //No errors except maybe those caused by missing revocation information
@@ -878,6 +934,11 @@ sal_Int32 SecurityEnvironment_MSCryptImpl::verifyCertificate(
                         SAL_INFO("xmlsecurity.xmlsec", "Certificate is valid.");
                         validity = css::security::CertificateValidity::VALID;
                     }
+                    else if (CheckUnitTestStore(pChainContext, 0))
+                    {
+                        SAL_INFO("xmlsecurity.xmlsec", "root certificate found in extra test store");
+                        validity = css::security::CertificateValidity::VALID;
+                    }
                     else
                     {
                         SAL_INFO("xmlsecurity.xmlsec", "Certificate is invalid.");