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-rw-r--r--xmlsecurity/source/gpg/xmlsignature_gpgimpl.cxx527
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diff --git a/xmlsecurity/source/gpg/xmlsignature_gpgimpl.cxx b/xmlsecurity/source/gpg/xmlsignature_gpgimpl.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <sal/log.hxx>
+#include <xmlsec-wrapper.h>
+#include <cppuhelper/supportsservice.hxx>
+#include <gpg/xmlsignature_gpgimpl.hxx>
+
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wundef"
+#endif
+#include <gpgme.h>
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic pop
+#endif
+#include <context.h>
+#include <key.h>
+#include <data.h>
+#include <signingresult.h>
+#include <importresult.h>
+
+#include <xmlelementwrapper_xmlsecimpl.hxx>
+#include <xmlsec/xmlstreamio.hxx>
+#include <xmlsec/errorcallback.hxx>
+
+#include "SecurityEnvironment.hxx"
+
+using namespace css::uno;
+using namespace css::lang;
+using namespace css::xml::wrapper;
+using namespace css::xml::crypto;
+
+XMLSignature_GpgImpl::XMLSignature_GpgImpl() {
+}
+
+XMLSignature_GpgImpl::~XMLSignature_GpgImpl() {
+}
+
+/* XXMLSignature */
+Reference< XXMLSignatureTemplate >
+SAL_CALL XMLSignature_GpgImpl::generate(
+ const Reference< XXMLSignatureTemplate >& aTemplate ,
+ const Reference< XSecurityEnvironment >& aEnvironment
+)
+{
+ xmlSecDSigCtxPtr pDsigCtx = nullptr ;
+ xmlNodePtr pNode = nullptr ;
+
+ if( !aTemplate.is() )
+ throw RuntimeException() ;
+
+ if( !aEnvironment.is() )
+ throw RuntimeException() ;
+
+ //Get the xml node
+ Reference< XXMLElementWrapper > xElement = aTemplate->getTemplate() ;
+ if( !xElement.is() ) {
+ throw RuntimeException() ;
+ }
+
+ XMLElementWrapper_XmlSecImpl* pElement =
+ dynamic_cast<XMLElementWrapper_XmlSecImpl*>(xElement.get());
+ if( pElement == nullptr ) {
+ throw RuntimeException() ;
+ }
+
+ pNode = pElement->getNativeElement() ;
+
+ //Get the stream/URI binding
+ Reference< XUriBinding > xUriBinding = aTemplate->getBinding() ;
+ if( xUriBinding.is() ) {
+ //Register the stream input callbacks into libxml2
+ if( xmlRegisterStreamInputCallbacks( xUriBinding ) < 0 )
+ throw RuntimeException() ;
+ }
+
+ //Get Keys Manager
+ SecurityEnvironmentGpg* pSecEnv =
+ dynamic_cast<SecurityEnvironmentGpg*>(aEnvironment.get());
+ if( pSecEnv == nullptr )
+ throw RuntimeException() ;
+
+ setErrorRecorder();
+
+ //Create Signature context
+ pDsigCtx = xmlSecDSigCtxCreate( nullptr ) ;
+ if( pDsigCtx == nullptr )
+ {
+ clearErrorRecorder();
+ return aTemplate;
+ }
+
+ // set intended operation to sign - several asserts inside libxmlsec
+ // wanting that for digest / transforms
+ pDsigCtx->operation = xmlSecTransformOperationSign;
+
+ // we default to SHA512 for all digests - nss crypto does not have it...
+ //pDsigCtx->defDigestMethodId = xmlSecTransformSha512Id;
+
+ // Calculate digest for all references
+ xmlNodePtr cur = xmlSecGetNextElementNode(pNode->children);
+ if( cur != nullptr )
+ cur = xmlSecGetNextElementNode(cur->children);
+ while( cur != nullptr )
+ {
+ // some of those children I suppose should be reference elements
+ if( xmlSecCheckNodeName(cur, xmlSecNodeReference, xmlSecDSigNs) )
+ {
+ xmlSecDSigReferenceCtxPtr pDsigRefCtx =
+ xmlSecDSigReferenceCtxCreate(pDsigCtx,
+ xmlSecDSigReferenceOriginSignedInfo);
+ if(pDsigRefCtx == nullptr)
+ throw RuntimeException();
+
+ // add this one to the list
+ if( xmlSecPtrListAdd(&(pDsigCtx->signedInfoReferences),
+ pDsigRefCtx) < 0 )
+ {
+ // TODO resource handling
+ xmlSecDSigReferenceCtxDestroy(pDsigRefCtx);
+ throw RuntimeException();
+ }
+
+ if( xmlSecDSigReferenceCtxProcessNode(pDsigRefCtx, cur) < 0 )
+ throw RuntimeException();
+
+ // final check - all good?
+ if(pDsigRefCtx->status != xmlSecDSigStatusSucceeded)
+ {
+ pDsigCtx->status = xmlSecDSigStatusInvalid;
+ return aTemplate; // TODO - harder error?
+ }
+ }
+
+ cur = xmlSecGetNextElementNode(cur->next);
+ }
+
+ // get me a digestible buffer from the signature template!
+ // -------------------------------------------------------
+
+ // run the transformations over SignedInfo element (first child of
+ // pNode)
+ xmlSecNodeSetPtr nodeset = nullptr;
+ cur = xmlSecGetNextElementNode(pNode->children);
+ // TODO assert that...
+ nodeset = xmlSecNodeSetGetChildren(pNode->doc, cur, 1, 0);
+ if(nodeset == nullptr)
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+ if( xmlSecTransformCtxXmlExecute(&(pDsigCtx->transformCtx), nodeset) < 0 )
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+ // now extract the keyid from PGPData
+ // walk xml tree to PGPData node - go to children, first is
+ // SignedInfo, 2nd is signaturevalue, 3rd is KeyInfo
+ // 1st child is PGPData, 1st grandchild is PGPKeyID
+ cur = xmlSecGetNextElementNode(pNode->children);
+ // TODO error handling
+ cur = xmlSecGetNextElementNode(cur->next);
+ cur = xmlSecGetNextElementNode(cur->next);
+ cur = xmlSecGetNextElementNode(cur->children);
+ // check that this is now PGPData
+ if(!xmlSecCheckNodeName(cur, xmlSecNodePGPData, xmlSecDSigNs))
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+ // check that this is now PGPKeyID
+ cur = xmlSecGetNextElementNode(cur->children);
+ static const xmlChar xmlSecNodePGPKeyID[] = "PGPKeyID";
+ if(!xmlSecCheckNodeName(cur, xmlSecNodePGPKeyID, xmlSecDSigNs))
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+ GpgME::Context& rCtx=pSecEnv->getGpgContext();
+ rCtx.setKeyListMode(GPGME_KEYLIST_MODE_LOCAL);
+ GpgME::Error err;
+ xmlChar* pKey=xmlNodeGetContent(cur);
+ if(xmlSecBase64Decode(pKey, reinterpret_cast<xmlSecByte*>(pKey), xmlStrlen(pKey)) < 0)
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+ if( rCtx.addSigningKey(
+ rCtx.key(
+ reinterpret_cast<char*>(pKey), err, true)) )
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+ xmlFree(pKey);
+
+ // good, ctx is setup now, let's sign the lot
+ GpgME::Data data_in(
+ reinterpret_cast<char*>(xmlSecBufferGetData(pDsigCtx->transformCtx.result)),
+ xmlSecBufferGetSize(pDsigCtx->transformCtx.result), false);
+ GpgME::Data data_out;
+
+ SAL_INFO("xmlsecurity.xmlsec.gpg", "Generating signature for: " << xmlSecBufferGetData(pDsigCtx->transformCtx.result));
+
+ // we base64-encode anyway
+ rCtx.setArmor(false);
+ GpgME::SigningResult sign_res=rCtx.sign(data_in, data_out,
+ GpgME::Detached);
+ off_t result = data_out.seek(0,SEEK_SET);
+ (void) result;
+ assert(result == 0);
+ int len=0, curr=0; char buf;
+ while( (curr=data_out.read(&buf, 1)) )
+ len += curr;
+
+ if(sign_res.error() || !len)
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+ // write signed data to xml
+ xmlChar* signature = static_cast<xmlChar*>(xmlMalloc(len + 1));
+ if(signature == nullptr)
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+ result = data_out.seek(0,SEEK_SET);
+ assert(result == 0);
+ if( data_out.read(signature, len) != len )
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+ // conversion to base64
+ xmlChar* signatureEncoded=nullptr;
+ if( !(signatureEncoded=xmlSecBase64Encode(reinterpret_cast<xmlSecByte*>(signature), len, 79)) )
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+ xmlFree(signature);
+
+ // walk xml tree to sign value node - go to children, first is
+ // SignedInfo, 2nd is signaturevalue
+ cur = xmlSecGetNextElementNode(pNode->children);
+ cur = xmlSecGetNextElementNode(cur->next);
+
+ // TODO some assert would be good...
+ xmlNodeSetContentLen(cur, signatureEncoded, xmlStrlen(signatureEncoded));
+ xmlFree(signatureEncoded);
+
+ aTemplate->setStatus(SecurityOperationStatus_OPERATION_SUCCEEDED);
+
+ // done
+ xmlSecDSigCtxDestroy( pDsigCtx ) ;
+
+ //Unregistered the stream/URI binding
+ if( xUriBinding.is() )
+ xmlUnregisterStreamInputCallbacks() ;
+
+ clearErrorRecorder();
+ return aTemplate ;
+}
+
+/* XXMLSignature */
+Reference< XXMLSignatureTemplate >
+SAL_CALL XMLSignature_GpgImpl::validate(
+ const Reference< XXMLSignatureTemplate >& aTemplate ,
+ const Reference< XXMLSecurityContext >& aSecurityCtx
+) {
+ xmlSecDSigCtxPtr pDsigCtx = nullptr ;
+ xmlNodePtr pNode = nullptr ;
+
+ if( !aTemplate.is() )
+ throw RuntimeException() ;
+
+ if( !aSecurityCtx.is() )
+ throw RuntimeException() ;
+
+ //Get the xml node
+ Reference< XXMLElementWrapper > xElement = aTemplate->getTemplate() ;
+ if( !xElement.is() )
+ throw RuntimeException() ;
+
+ XMLElementWrapper_XmlSecImpl* pElement =
+ dynamic_cast<XMLElementWrapper_XmlSecImpl*>(xElement.get());
+ if( pElement == nullptr )
+ throw RuntimeException() ;
+
+ pNode = pElement->getNativeElement() ;
+
+ //Get the stream/URI binding
+ Reference< XUriBinding > xUriBinding = aTemplate->getBinding() ;
+ if( xUriBinding.is() ) {
+ //Register the stream input callbacks into libxml2
+ if( xmlRegisterStreamInputCallbacks( xUriBinding ) < 0 )
+ throw RuntimeException() ;
+ }
+
+ setErrorRecorder();
+
+ sal_Int32 nSecurityEnvironment = aSecurityCtx->getSecurityEnvironmentNumber();
+ sal_Int32 i;
+
+ for (i=0; i<nSecurityEnvironment; ++i)
+ {
+ Reference< XSecurityEnvironment > aEnvironment = aSecurityCtx->getSecurityEnvironmentByIndex(i);
+
+ SecurityEnvironmentGpg* pSecEnv =
+ dynamic_cast<SecurityEnvironmentGpg*>(aEnvironment.get());
+ if( pSecEnv == nullptr )
+ throw RuntimeException() ;
+
+ // TODO figure out key from pSecEnv!
+ // unclear how/where that is transported in nss impl...
+
+ //Create Signature context
+ pDsigCtx = xmlSecDSigCtxCreate( nullptr ) ;
+ if( pDsigCtx == nullptr )
+ {
+ clearErrorRecorder();
+ return aTemplate;
+ }
+
+ // set intended operation to verify - several asserts inside libxmlsec
+ // wanting that for digest / transforms
+ pDsigCtx->operation = xmlSecTransformOperationVerify;
+
+ // reset status - to be set later
+ pDsigCtx->status = xmlSecDSigStatusUnknown;
+
+ // get me a digestible buffer from the SignatureInfo node!
+ // -------------------------------------------------------
+
+ // run the transformations - first child node is required to
+ // be SignatureInfo
+ xmlSecNodeSetPtr nodeset = nullptr;
+ xmlNodePtr cur = xmlSecGetNextElementNode(pNode->children);
+ // TODO assert that...
+ nodeset = xmlSecNodeSetGetChildren(pNode->doc, cur, 1, 0);
+ if(nodeset == nullptr)
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+ // TODO assert we really have the SignatureInfo here?
+ if( xmlSecTransformCtxXmlExecute(&(pDsigCtx->transformCtx), nodeset) < 0 )
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+ // Validate the template via gpgme
+ GpgME::Context& rCtx=pSecEnv->getGpgContext();
+
+ GpgME::Data data_text(
+ reinterpret_cast<char*>(xmlSecBufferGetData(pDsigCtx->transformCtx.result)),
+ xmlSecBufferGetSize(pDsigCtx->transformCtx.result), false);
+
+ SAL_INFO("xmlsecurity.xmlsec.gpg", "Validating SignatureInfo: " << xmlSecBufferGetData(pDsigCtx->transformCtx.result));
+
+ // walk xml tree to sign value node - go to children, first is
+ // SignedInfo, 2nd is signaturevalue
+ cur = xmlSecGetNextElementNode(pNode->children);
+ cur = xmlSecGetNextElementNode(cur->next);
+
+ if(!xmlSecCheckNodeName(cur, xmlSecNodeSignatureValue, xmlSecDSigNs))
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+ xmlChar* pSignatureValue=xmlNodeGetContent(cur);
+ int nSigSize = xmlSecBase64Decode(pSignatureValue, reinterpret_cast<xmlSecByte*>(pSignatureValue), xmlStrlen(pSignatureValue));
+ if( nSigSize < 0)
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+ GpgME::Data data_signature(
+ reinterpret_cast<char*>(pSignatureValue),
+ nSigSize, false);
+
+ GpgME::VerificationResult verify_res=rCtx.verifyDetachedSignature(
+ data_signature, data_text);
+
+ // TODO: needs some more error handling, needs checking _all_ signatures
+ if( verify_res.isNull() || verify_res.numSignatures() == 0
+ // there is at least 1 signature and it is anything else than fully valid
+ || ( (verify_res.numSignatures() > 0)
+ && verify_res.signature(0).status().encodedError() > 0 ) )
+ {
+ // let's try again, but this time import the public key
+ // payload (avoiding that in a first cut for being a bit
+ // speedier. also prevents all too easy poisoning/sha1
+ // fingerprint collision attacks)
+
+ // walk xml tree to PGPData node - go to children, first is
+ // SignedInfo, 2nd is signaturevalue, 3rd is KeyInfo
+ // 1st child is PGPData, 1st or 2nd grandchild is PGPKeyPacket
+ cur = xmlSecGetNextElementNode(pNode->children);
+ // TODO error handling
+ cur = xmlSecGetNextElementNode(cur->next);
+ cur = xmlSecGetNextElementNode(cur->next);
+ cur = xmlSecGetNextElementNode(cur->children);
+ // check that this is now PGPData
+ if(!xmlSecCheckNodeName(cur, xmlSecNodePGPData, xmlSecDSigNs))
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+ // check that this is now PGPKeyPacket
+ cur = xmlSecGetNextElementNode(cur->children);
+ static const xmlChar xmlSecNodePGPKeyPacket[] = "PGPKeyPacket";
+ if(!xmlSecCheckNodeName(cur, xmlSecNodePGPKeyPacket, xmlSecDSigNs))
+ {
+ // not this one, maybe the next?
+ cur = xmlSecGetNextElementNode(cur->next);
+ if(!xmlSecCheckNodeName(cur, xmlSecNodePGPKeyPacket, xmlSecDSigNs))
+ {
+ // ok, giving up
+ clearErrorRecorder();
+ xmlFree(pSignatureValue);
+
+ return aTemplate;
+ }
+ }
+
+ // got a key packet, import & re-validate
+ xmlChar* pKeyPacket=xmlNodeGetContent(cur);
+ int nKeyLen = xmlSecBase64Decode(pKeyPacket, reinterpret_cast<xmlSecByte*>(pKeyPacket), xmlStrlen(pKeyPacket));
+ if( nKeyLen < 0)
+ throw RuntimeException("The GpgME library failed to initialize for the OpenPGP protocol.");
+
+ GpgME::Data data_key(
+ reinterpret_cast<char*>(pKeyPacket),
+ nKeyLen, false);
+
+ rCtx.importKeys(data_key);
+ xmlFree(pKeyPacket);
+
+ // and re-run (rewind text and signature streams to position 0)
+ (void)data_text.seek(0,SEEK_SET);
+ (void)data_signature.seek(0,SEEK_SET);
+ verify_res=rCtx.verifyDetachedSignature(data_signature, data_text);
+
+ // TODO: needs some more error handling, needs checking _all_ signatures
+ if( verify_res.isNull() || verify_res.numSignatures() == 0
+ // there is at least 1 signature and it is anything else than valid
+ || ( (verify_res.numSignatures() > 0)
+ && verify_res.signature(0).status().encodedError() > 0 ) )
+ {
+ clearErrorRecorder();
+ xmlFree(pSignatureValue);
+
+ return aTemplate;
+ }
+ }
+
+ xmlFree(pSignatureValue);
+
+ // now verify digest for all references
+ cur = xmlSecGetNextElementNode(pNode->children);
+ if( cur != nullptr )
+ cur = xmlSecGetNextElementNode(cur->children);
+ while( cur != nullptr )
+ {
+ // some of those children I suppose should be reference elements
+ if( xmlSecCheckNodeName(cur, xmlSecNodeReference, xmlSecDSigNs) )
+ {
+ xmlSecDSigReferenceCtxPtr pDsigRefCtx =
+ xmlSecDSigReferenceCtxCreate(pDsigCtx,
+ xmlSecDSigReferenceOriginSignedInfo);
+ if(pDsigRefCtx == nullptr)
+ throw RuntimeException();
+
+ // add this one to the list
+ if( xmlSecPtrListAdd(&(pDsigCtx->signedInfoReferences),
+ pDsigRefCtx) < 0 )
+ {
+ // TODO resource handling
+ xmlSecDSigReferenceCtxDestroy(pDsigRefCtx);
+ throw RuntimeException();
+ }
+
+ if( xmlSecDSigReferenceCtxProcessNode(pDsigRefCtx, cur) < 0 )
+ throw RuntimeException();
+
+ // final check - all good?
+ if(pDsigRefCtx->status != xmlSecDSigStatusSucceeded)
+ {
+ pDsigCtx->status = xmlSecDSigStatusInvalid;
+ return aTemplate; // TODO - harder error?
+ }
+ }
+
+ cur = xmlSecGetNextElementNode(cur->next);
+ }
+
+ // TODO - also verify manifest (only relevant for ooxml)?
+ aTemplate->setStatus(SecurityOperationStatus_OPERATION_SUCCEEDED);
+
+ // done
+ xmlSecDSigCtxDestroy( pDsigCtx ) ;
+ }
+
+ //Unregistered the stream/URI binding
+ if( xUriBinding.is() )
+ xmlUnregisterStreamInputCallbacks() ;
+
+ clearErrorRecorder();
+ return aTemplate ;
+}
+
+/* XServiceInfo */
+OUString SAL_CALL XMLSignature_GpgImpl::getImplementationName() {
+ return impl_getImplementationName() ;
+}
+
+/* XServiceInfo */
+sal_Bool SAL_CALL XMLSignature_GpgImpl::supportsService( const OUString& serviceName) {
+ return cppu::supportsService(this, serviceName);
+}
+
+/* XServiceInfo */
+Sequence< OUString > SAL_CALL XMLSignature_GpgImpl::getSupportedServiceNames() {
+ return impl_getSupportedServiceNames() ;
+}
+
+//Helper for XServiceInfo
+Sequence< OUString > XMLSignature_GpgImpl::impl_getSupportedServiceNames() {
+ Sequence<OUString> seqServiceNames { "com.sun.star.xml.crypto.XMLSignature" };
+ return seqServiceNames ;
+}
+
+OUString XMLSignature_GpgImpl::impl_getImplementationName() {
+ return "com.sun.star.xml.security.bridge.xmlsec.XMLSignature_GpgImpl" ;
+}
+
+//Helper for registry
+Reference< XInterface > XMLSignature_GpgImpl::impl_createInstance( const Reference< XMultiServiceFactory >& ) {
+ return Reference< XInterface >( *new XMLSignature_GpgImpl ) ;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */