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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 <xmlsec-wrapper.h>
/*
* Implementation of the I/O interfaces based on stream and URI binding
*/
#include <xmlsec/xmlstreamio.hxx>
#include <xmlsec/errorcallback.hxx>
#include <rtl/ustring.hxx>
#include <rtl/uri.hxx>
#include <comphelper/scopeguard.hxx>
#include <com/sun/star/xml/crypto/XUriBinding.hpp>
static bool g_bInputCallbacksEnabled = false;
static bool g_bInputCallbacksRegistered = false;
static css::uno::Reference< css::xml::crypto::XUriBinding > m_xUriBinding ;
extern "C" {
static int xmlStreamMatch( const char* uri )
{
css::uno::Reference< css::io::XInputStream > xInputStream ;
if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
{
if( uri == nullptr || !m_xUriBinding.is() )
return 0 ;
//XMLSec first unescapes the uri and calls this function. For example, we pass the Uri
//ObjectReplacements/Object%201 then XMLSec passes ObjectReplacements/Object 1
//first. If this failed it would try this
//again with the original escaped string. However, it does not get this far, because there
//is another callback registered by libxml which claims to be able to handle this uri.
OUString sUri =
::rtl::Uri::encode( OUString::createFromAscii( uri ),
rtl_UriCharClassUric, rtl_UriEncodeKeepEscapes, RTL_TEXTENCODING_UTF8);
xInputStream = m_xUriBinding->getUriBinding( sUri ) ;
if (!xInputStream.is())
{
//Try the passed in uri directly.
//For old documents prior OOo 3.0. We did not use URIs then.
xInputStream = m_xUriBinding->getUriBinding(
OUString::createFromAscii(uri));
}
}
if (xInputStream.is())
return 1;
else
return 0 ;
}
static void* xmlStreamOpen( const char* uri )
{
css::uno::Reference< css::io::XInputStream > xInputStream ;
if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
{
if( uri == nullptr || !m_xUriBinding.is() )
return nullptr ;
//see xmlStreamMatch
OUString sUri =
::rtl::Uri::encode( OUString::createFromAscii( uri ),
rtl_UriCharClassUric, rtl_UriEncodeKeepEscapes, RTL_TEXTENCODING_UTF8);
xInputStream = m_xUriBinding->getUriBinding( sUri ) ;
if (!xInputStream.is())
{
//For old documents.
//try the passed in uri directly.
xInputStream = m_xUriBinding->getUriBinding(
OUString::createFromAscii(uri));
}
if( xInputStream.is() ) {
css::io::XInputStream* pInputStream ;
pInputStream = xInputStream.get() ;
pInputStream->acquire() ;
return static_cast<void*>(pInputStream) ;
}
}
return nullptr ;
}
static int xmlStreamRead( void* context, char* buffer, int len )
{
int numbers ;
css::uno::Reference< css::io::XInputStream > xInputStream ;
css::uno::Sequence< sal_Int8 > outSeqs( len ) ;
numbers = 0 ;
if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
{
if( context != nullptr ) {
xInputStream = static_cast<css::io::XInputStream*>(context);
if( !xInputStream.is() )
return 0 ;
numbers = xInputStream->readBytes( outSeqs, len ) ;
const sal_Int8* readBytes = outSeqs.getArray() ;
for( int i = 0 ; i < numbers ; i ++ )
*( buffer + i ) = *( readBytes + i ) ;
}
}
return numbers ;
}
static int xmlStreamClose( void * context )
{
if (g_bInputCallbacksEnabled && g_bInputCallbacksRegistered)
{
if( context != nullptr ) {
css::io::XInputStream* pInputStream ;
pInputStream = static_cast<css::io::XInputStream*>(context);
pInputStream->release() ;
}
}
return 0 ;
}
}
int xmlEnableStreamInputCallbacks()
{
if (!g_bInputCallbacksEnabled)
{
//Register the callbacks into xmlSec
//In order to make the xmlsec io finding the callbacks firstly,
//I put the callbacks at the very beginning.
//Cleanup the older callbacks.
//Notes: all none default callbacks will lose.
xmlSecIOCleanupCallbacks() ;
// Make sure that errors are reported via SAL_WARN().
setErrorRecorder();
comphelper::ScopeGuard g([] { clearErrorRecorder(); });
// Newer xmlsec wants the callback order in the opposite direction.
if (xmlSecCheckVersionExt(1, 2, 26, xmlSecCheckVersionABICompatible))
{
//Register the default callbacks.
//Notes: the error will cause xmlsec working problems.
int cbs = xmlSecIORegisterDefaultCallbacks() ;
if( cbs < 0 ) {
return -1 ;
}
//Register my classbacks.
cbs = xmlSecIORegisterCallbacks(
xmlStreamMatch,
xmlStreamOpen,
xmlStreamRead,
xmlStreamClose ) ;
if( cbs < 0 ) {
return -1 ;
}
}
else
{
//Register my classbacks.
int cbs = xmlSecIORegisterCallbacks(
xmlStreamMatch,
xmlStreamOpen,
xmlStreamRead,
xmlStreamClose ) ;
if( cbs < 0 ) {
return -1 ;
}
//Register the default callbacks.
//Notes: the error will cause xmlsec working problems.
cbs = xmlSecIORegisterDefaultCallbacks() ;
if( cbs < 0 ) {
return -1 ;
}
}
g_bInputCallbacksEnabled = true;
}
return 0 ;
}
int xmlRegisterStreamInputCallbacks(
css::uno::Reference< css::xml::crypto::XUriBinding > const & aUriBinding
) {
if (!g_bInputCallbacksEnabled)
{
if( xmlEnableStreamInputCallbacks() < 0 )
return -1 ;
}
if (!g_bInputCallbacksRegistered)
g_bInputCallbacksRegistered = true;
m_xUriBinding = aUriBinding ;
return 0 ;
}
int xmlUnregisterStreamInputCallbacks()
{
if (g_bInputCallbacksRegistered)
{
//Clear the uri-stream binding
m_xUriBinding.clear() ;
//disable the registered flag
g_bInputCallbacksRegistered = false;
}
return 0 ;
}
void xmlDisableStreamInputCallbacks() {
xmlUnregisterStreamInputCallbacks() ;
g_bInputCallbacksEnabled = false;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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