xmlsecurity/source/xmlsec/xmlstreamio.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 /*
  22  * Implementation of the I/O interfaces based on stream and URI binding
  23  */
  24 #include "xmlstreamio.hxx"
  25 #include <rtl/ustring.hxx>
  26 #include "rtl/uri.hxx"
  27
  28 #include <libxml/uri.h>
  29 #include <sal/types.h>
  30 //For reasons that escape me, this is what xmlsec does when size_t is not 4
  31 #if SAL_TYPES_SIZEOFPOINTER != 4
  32 #    define XMLSEC_NO_SIZE_T
  33 #endif
  34 #include <xmlsec/io.h>
  35
  36 #define XMLSTREAMIO_INITIALIZED 0x01
  37 #define XMLSTREAMIO_REGISTERED  0x02
  38
  39 /* Global variables */
  40 /*-
  41  * Enable stream I/O or not.
  42  */
  43 static char enableXmlStreamIO = 0x00 ;
  44
  45 ::com::sun::star::uno::Reference< ::com::sun::star::xml::crypto::XUriBinding > m_xUriBinding ;
  46
  47 extern "C"
  48 int xmlStreamMatch( const char* uri )
  49 {
  50     ::com::sun::star::uno::Reference< com::sun::star::io::XInputStream > xInputStream ;
  51
  52     if( ( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) &&
  53         ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
  54         if( uri == NULL || !m_xUriBinding.is() )
  55             return 0 ;
  56         //XMLSec first unescapes the uri and  calls this function. For example, we pass the Uri
  57         //ObjectReplacements/Object%201 then XMLSec passes ObjectReplacements/Object 1
  58         //first. If this failed it would try this
  59         //again with the original escaped string. However, it does not get this far, because there
  60         //is another callback registered by libxml which claims to be able to handle this uri.
  61         ::rtl::OUString sUri =
  62             ::rtl::Uri::encode( ::rtl::OUString::createFromAscii( uri ),
  63             rtl_UriCharClassUric, rtl_UriEncodeKeepEscapes, RTL_TEXTENCODING_UTF8);
  64         xInputStream = m_xUriBinding->getUriBinding( sUri ) ;
  65         if (!xInputStream.is())
  66         {
  67             //Try the the passed in uri directly.
  68             //For old documents prior OOo 3.0. We did not use URIs then.
  69             xInputStream = m_xUriBinding->getUriBinding(
  70                 ::rtl::OUString::createFromAscii(uri));
  71         }
  72     }
  73     if (xInputStream.is())
  74         return 1;
  75     else
  76         return 0 ;
  77 }
  78
  79 extern "C"
  80 void* xmlStreamOpen( const char* uri )
  81 {
  82     ::com::sun::star::uno::Reference< com::sun::star::io::XInputStream > xInputStream ;
  83     ::com::sun::star::io::XInputStream* pInputStream ;
  84
  85     if( ( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) &&
  86         ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
  87         if( uri == NULL || !m_xUriBinding.is() )
  88             return NULL ;
  89
  90         //see xmlStreamMatch
  91         ::rtl::OUString sUri =
  92             ::rtl::Uri::encode( ::rtl::OUString::createFromAscii( uri ),
  93             rtl_UriCharClassUric, rtl_UriEncodeKeepEscapes, RTL_TEXTENCODING_UTF8);
  94         xInputStream = m_xUriBinding->getUriBinding( sUri ) ;
  95         if (!xInputStream.is())
  96         {
  97             //For old documents.
  98             //try the the passed in uri directly.
  99             xInputStream = m_xUriBinding->getUriBinding(
 100                 ::rtl::OUString::createFromAscii(uri));
 101         }
 102
 103         if( xInputStream.is() ) {
 104             pInputStream = xInputStream.get() ;
 105             pInputStream->acquire() ;
 106             return ( void* )pInputStream ;
 107         }
 108     }
 109
 110     return NULL ;
 111 }
 112
 113 extern "C"
 114 int xmlStreamRead( void* context, char* buffer, int len )
 115 {
 116     int numbers ;
 117     ::com::sun::star::uno::Reference< com::sun::star::io::XInputStream > xInputStream ;
 118     ::com::sun::star::uno::Sequence< sal_Int8 > outSeqs( len ) ;
 119
 120     numbers = 0 ;
 121     if( ( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) &&
 122         ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
 123         if( context != NULL ) {
 124             xInputStream = ( com::sun::star::io::XInputStream* )context ;
 125             if( !xInputStream.is() )
 126                 return 0 ;
 127
 128             numbers = xInputStream->readBytes( outSeqs, len ) ;
 129             const sal_Int8* readBytes = ( const sal_Int8* )outSeqs.getArray() ;
 130             for( int i = 0 ; i < numbers ; i ++ )
 131                 *( buffer + i ) = *( readBytes + i ) ;
 132         }
 133     }
 134
 135     return numbers ;
 136 }
 137
 138 extern "C"
 139 int xmlStreamClose( void * context )
 140 {
 141     ::com::sun::star::io::XInputStream* pInputStream ;
 142
 143     if( ( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) &&
 144         ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
 145         if( context != NULL ) {
 146             pInputStream = ( ::com::sun::star::io::XInputStream* )context ;
 147             pInputStream->release() ;
 148         }
 149     }
 150
 151     return 0 ;
 152 }
 153
 154 int xmlEnableStreamInputCallbacks()
 155 {
 156
 157     if( !( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) ) {
 158         //Register the callbacks into xmlSec
 159         //In order to make the xmlsec io finding the callbacks firstly,
 160         //I put the callbacks at the very begining.
 161
 162         //Cleanup the older callbacks.
 163         //Notes: all none default callbacks will lose.
 164         xmlSecIOCleanupCallbacks() ;
 165
 166         //Register my classbacks.
 167         int cbs = xmlSecIORegisterCallbacks(
 168                     xmlStreamMatch,
 169                     xmlStreamOpen,
 170                     xmlStreamRead,
 171                     xmlStreamClose ) ;
 172         if( cbs < 0 ) {
 173             return -1 ;
 174         }
 175
 176         //Register the default callbacks.
 177         //Notes: the error will cause xmlsec working problems.
 178         cbs = xmlSecIORegisterDefaultCallbacks() ;
 179         if( cbs < 0 ) {
 180             return -1 ;
 181         }
 182
 183         enableXmlStreamIO |= XMLSTREAMIO_INITIALIZED ;
 184     }
 185
 186     return 0 ;
 187 }
 188
 189 int xmlRegisterStreamInputCallbacks(
 190     ::com::sun::star::uno::Reference< ::com::sun::star::xml::crypto::XUriBinding >& aUriBinding
 191 ) {
 192     if( !( enableXmlStreamIO & XMLSTREAMIO_INITIALIZED ) ) {
 193         if( xmlEnableStreamInputCallbacks() < 0 )
 194             return -1 ;
 195     }
 196
 197     if( !( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
 198         enableXmlStreamIO |= XMLSTREAMIO_REGISTERED ;
 199     }
 200
 201     m_xUriBinding = aUriBinding ;
 202
 203     return 0 ;
 204 }
 205
 206 int xmlUnregisterStreamInputCallbacks( void )
 207 {
 208     if( ( enableXmlStreamIO & XMLSTREAMIO_REGISTERED ) ) {
 209         //Clear the uir-stream binding
 210         m_xUriBinding.clear() ;
 211
 212         //disable the registered flag
 213         enableXmlStreamIO &= ~XMLSTREAMIO_REGISTERED ;
 214     }
 215
 216     return 0 ;
 217 }
 218
 219 void xmlDisableStreamInputCallbacks() {
 220     xmlUnregisterStreamInputCallbacks() ;
 221     enableXmlStreamIO &= ~XMLSTREAMIO_INITIALIZED ;
 222 }
 223
 224 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */