xmlsecurity: add tests for multiple X509Data/X509Certificate

Change-Id: If50ae8156f81c1053aa8fbfc3148da64bb8e1442
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/111666
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
Tested-by: Jenkins
(cherry picked from commit 40d70d427edddb589eda64fafc2e56536953d274)

This commit also contains:

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.

Change-Id: Ic9865e0b5783211c2128ce0327c4583b7784ff62
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/123667
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
(cherry picked from commit 7d664ec788acdc378506a7ff8b1120cea24a6770)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/123646
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>

9 files changed, 431 insertions, 2 deletions

diff --git a/test/signing-keys/test.p7b b/test/signing-keys/test.p7b
new file mode 100644
index 000000000000..44723697a2bf
--- /dev/null
+++ b/test/signing-keys/test.p7b
@@ -0,0 +1,249 @@
+-----BEGIN PKCS7-----
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+Y3U3LDo+kQfo7hfVZ/HdrhK7ldhXbz7nMQA=
+-----END PKCS7-----
diff --git a/unotest/source/cpp/macros_test.cxx b/unotest/source/cpp/macros_test.cxx
index a6d690e0d2c1..0acf9db7edf5 100644
--- a/unotest/source/cpp/macros_test.cxx
+++ b/unotest/source/cpp/macros_test.cxx
@@ -103,7 +103,12 @@ void MacrosTest::setUpNssGpg(const test::Directories& rDirectories, const OUStri
     OUString aTargetPath;
     osl::FileBase::getSystemPathFromFileURL(aTargetDir, aTargetPath);
 
-#ifndef _WIN32
+#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
diff --git a/xmlsecurity/qa/unit/signing/data/02_doc_macros_signed_by_attacker_manipulated.odt b/xmlsecurity/qa/unit/signing/data/02_doc_macros_signed_by_attacker_manipulated.odt
new file mode 100644
index 000000000000..d63e4b6b7b72
--- /dev/null
+++ b/xmlsecurity/qa/unit/signing/data/02_doc_macros_signed_by_attacker_manipulated.odt
diff --git a/xmlsecurity/qa/unit/signing/data/02_doc_signed_by_attacker_manipulated.odt b/xmlsecurity/qa/unit/signing/data/02_doc_signed_by_attacker_manipulated.odt
new file mode 100644
index 000000000000..0190abb00f23
--- /dev/null
+++ b/xmlsecurity/qa/unit/signing/data/02_doc_signed_by_attacker_manipulated.odt
diff --git a/xmlsecurity/qa/unit/signing/data/02_doc_signed_by_attacker_manipulated2.odt b/xmlsecurity/qa/unit/signing/data/02_doc_signed_by_attacker_manipulated2.odt
new file mode 100644
index 000000000000..f4b4198f94a6
--- /dev/null
+++ b/xmlsecurity/qa/unit/signing/data/02_doc_signed_by_attacker_manipulated2.odt
diff --git a/xmlsecurity/qa/unit/signing/data/02_doc_signed_by_attacker_manipulated_triple.odt b/xmlsecurity/qa/unit/signing/data/02_doc_signed_by_attacker_manipulated_triple.odt
new file mode 100644
index 000000000000..558bdee47e59
--- /dev/null
+++ b/xmlsecurity/qa/unit/signing/data/02_doc_signed_by_attacker_manipulated_triple.odt
diff --git a/xmlsecurity/qa/unit/signing/data/signed_with_x509certificate_chain.odt b/xmlsecurity/qa/unit/signing/data/signed_with_x509certificate_chain.odt
new file mode 100644
index 000000000000..5e519dd8b7e7
--- /dev/null
+++ b/xmlsecurity/qa/unit/signing/data/signed_with_x509certificate_chain.odt
diff --git a/xmlsecurity/qa/unit/signing/signing.cxx b/xmlsecurity/qa/unit/signing/signing.cxx
index 1ac88f9e731b..b040f8861600 100644
--- a/xmlsecurity/qa/unit/signing/signing.cxx
+++ b/xmlsecurity/qa/unit/signing/signing.cxx
@@ -21,6 +21,7 @@
 #include <com/sun/star/embed/XTransactedObject.hpp>
 #include <com/sun/star/frame/Desktop.hpp>
 #include <com/sun/star/frame/XStorable.hpp>
+#include <com/sun/star/security/CertificateValidity.hpp>
 #include <com/sun/star/security/DocumentDigitalSignatures.hpp>
 #include <com/sun/star/security/XDocumentDigitalSignatures.hpp>
 #include <com/sun/star/xml/crypto/SEInitializer.hpp>
@@ -530,6 +531,120 @@ CPPUNIT_TEST_FIXTURE(SigningTest, testODFUnsignedTimestamp)
     CPPUNIT_ASSERT_EQUAL(sal_Int32(18183742), infos[0].SignatureTime);
 }
 
+CPPUNIT_TEST_FIXTURE(SigningTest, testODFX509CertificateChain)
+{
+    createDoc(m_directories.getURLFromSrc(DATA_DIRECTORY)
+              + "signed_with_x509certificate_chain.odt");
+    SfxBaseModel* pBaseModel = dynamic_cast<SfxBaseModel*>(mxComponent.get());
+    CPPUNIT_ASSERT(pBaseModel);
+    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));
+    uno::Sequence<security::DocumentSignatureInformation> const infos(
+        pObjectShell->GetDocumentSignatureInformation(false));
+    CPPUNIT_ASSERT_EQUAL(sal_Int32(1), infos.getLength());
+    // check that the signing certificate was picked, not one of the 2 CA ones
+    CPPUNIT_ASSERT_EQUAL(security::CertificateValidity::VALID, infos[0].CertificateStatus);
+    CPPUNIT_ASSERT(infos[0].Signer.is());
+    CPPUNIT_ASSERT_EQUAL(
+        OUString("CN=Xmlsecurity RSA Test example Alice,O=Xmlsecurity RSA Test,ST=England,C=UK"),
+        // CryptoAPI puts a space after comma, NSS does not...
+        infos[0].Signer->getSubjectName().replaceAll(", ", ","));
+}
+
+CPPUNIT_TEST_FIXTURE(SigningTest, testODFDoubleX509Data)
+{
+    createDoc(m_directories.getURLFromSrc(DATA_DIRECTORY)
+              + "02_doc_signed_by_attacker_manipulated.odt");
+    SfxBaseModel* pBaseModel = dynamic_cast<SfxBaseModel*>(mxComponent.get());
+    CPPUNIT_ASSERT(pBaseModel);
+    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));
+    uno::Sequence<security::DocumentSignatureInformation> const infos(
+        pObjectShell->GetDocumentSignatureInformation(false));
+    CPPUNIT_ASSERT_EQUAL(sal_Int32(1), infos.getLength());
+    // the signature in this manipulated document is technically valid but we can't tell who signed
+    // it, so make sure no misleading info is shown to the user
+    CPPUNIT_ASSERT_EQUAL(security::CertificateValidity::INVALID, infos[0].CertificateStatus);
+    CPPUNIT_ASSERT(!infos[0].Signer.is());
+}
+
+CPPUNIT_TEST_FIXTURE(SigningTest, testODFTripleX509Data)
+{
+    createDoc(m_directories.getURLFromSrc(DATA_DIRECTORY)
+              + "02_doc_signed_by_attacker_manipulated_triple.odt");
+    SfxBaseModel* pBaseModel = dynamic_cast<SfxBaseModel*>(mxComponent.get());
+    CPPUNIT_ASSERT(pBaseModel);
+    SfxObjectShell* pObjectShell = pBaseModel->GetObjectShell();
+    CPPUNIT_ASSERT(pObjectShell);
+    SignatureState nActual = pObjectShell->GetDocumentSignatureState();
+    // here, libxmlsec will pick the 1st X509Data but signing key is the 2nd
+    CPPUNIT_ASSERT_EQUAL_MESSAGE((OString::number(o3tl::underlyingEnumValue(nActual)).getStr()),
+                                 SignatureState::BROKEN, nActual);
+    uno::Sequence<security::DocumentSignatureInformation> const infos(
+        pObjectShell->GetDocumentSignatureInformation(false));
+    CPPUNIT_ASSERT_EQUAL(sal_Int32(1), infos.getLength());
+    // the signature in this manipulated document is technically valid but we can't tell who signed
+    // it, so make sure no misleading info is shown to the user
+    CPPUNIT_ASSERT_EQUAL(security::CertificateValidity::INVALID, infos[0].CertificateStatus);
+    CPPUNIT_ASSERT(!infos[0].Signer.is());
+}
+
+CPPUNIT_TEST_FIXTURE(SigningTest, testODFMacroDoubleX509Data)
+{
+    createDoc(m_directories.getURLFromSrc(DATA_DIRECTORY)
+              + "02_doc_macros_signed_by_attacker_manipulated.odt");
+    SfxBaseModel* pBaseModel = dynamic_cast<SfxBaseModel*>(mxComponent.get());
+    CPPUNIT_ASSERT(pBaseModel);
+    SfxObjectShell* pObjectShell = pBaseModel->GetObjectShell();
+    CPPUNIT_ASSERT(pObjectShell);
+    SignatureState nActual = pObjectShell->GetScriptingSignatureState();
+    CPPUNIT_ASSERT_MESSAGE(
+        (OString::number(o3tl::underlyingEnumValue(nActual)).getStr()),
+        (nActual == SignatureState::NOTVALIDATED || nActual == SignatureState::OK));
+    uno::Sequence<security::DocumentSignatureInformation> const infos(
+        pObjectShell->GetDocumentSignatureInformation(true));
+    CPPUNIT_ASSERT_EQUAL(sal_Int32(1), infos.getLength());
+    // the signature in this manipulated document is technically valid but we can't tell who signed
+    // it, so make sure no misleading info is shown to the user
+    CPPUNIT_ASSERT_EQUAL(security::CertificateValidity::INVALID, infos[0].CertificateStatus);
+    CPPUNIT_ASSERT(!infos[0].Signer.is());
+}
+
+CPPUNIT_TEST_FIXTURE(SigningTest, testODFDoubleX509Certificate)
+{
+    createDoc(m_directories.getURLFromSrc(DATA_DIRECTORY)
+              + "02_doc_signed_by_attacker_manipulated2.odt");
+    SfxBaseModel* pBaseModel = dynamic_cast<SfxBaseModel*>(mxComponent.get());
+    CPPUNIT_ASSERT(pBaseModel);
+    SfxObjectShell* pObjectShell = pBaseModel->GetObjectShell();
+    CPPUNIT_ASSERT(pObjectShell);
+    SignatureState nActual = pObjectShell->GetDocumentSignatureState();
+    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());
+    // the signature in this manipulated document is technically valid but we can't tell who signed
+    // it, so make sure no misleading info is shown to the user
+    CPPUNIT_ASSERT_EQUAL(security::CertificateValidity::INVALID, infos[0].CertificateStatus);
+    CPPUNIT_ASSERT(!infos[0].Signer.is());
+}
+
 /// Test a typical OOXML where a number of (but not all) streams are signed.
 CPPUNIT_TEST_FIXTURE(SigningTest, testOOXMLPartial)
 {
diff --git a/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx b/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx
index 4f16dc5707ca..cd3d315efdd9 100644
--- a/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx
+++ b/xmlsecurity/source/xmlsec/mscrypt/securityenvironment_mscryptimpl.cxx
@@ -745,6 +745,60 @@ static HCERTSTORE getCertStoreForIntermediatCerts(
     return store;
 }
 
+static bool CheckUnitTestStore(PCCERT_CHAIN_CONTEXT const pChainContext, DWORD ignoreFlags)
+{
+    bool ret = false;
+    static char const*const pVar = getenv("LIBO_TEST_CRYPTOAPI_PKCS7");
+    if (!pVar)
+    {
+        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_A,
+            PKCS_7_ASN_ENCODING | X509_ASN_ENCODING,
+            NULL,
+            CERT_STORE_OPEN_EXISTING_FLAG | CERT_STORE_READONLY_FLAG,
+            OString(OString::Concat(pVar) + "/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
@@ -847,7 +901,8 @@ 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
@@ -876,6 +931,11 @@ 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.");