[Development] Implement secure TLS streams.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4044 3789f03b-4d11-0410-bbf8-ca57d06f2519

common/rdr/Exception.cxx

@@ -1,4 +1,6 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * Copyright (C) 2004 Red Hat Inc.
+ * Copyright (C) 2010 TigerVNC Team
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -15,7 +17,13 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
  * USA.
  */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #include <rdr/Exception.h>
+#include <rdr/TLSException.h>
 #ifdef _WIN32
 #include <tchar.h>
 #include <winsock2.h>
@@ -26,6 +34,10 @@
 
 #include <string.h>
 
+#ifdef HAVE_GNUTLS
+#include <gnutls/gnutls.h>
+#endif
+
 using namespace rdr;
 
 Exception::Exception(const char *format, ...) {
@@ -83,3 +95,4 @@ SystemException::SystemException(const char* s, int err_)
   strncat(str_, buf, len-1-strlen(str_));
   strncat(str_, ")", len-1-strlen(str_));
 }
+

common/rdr/Exception.h

@@ -1,4 +1,6 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * Copyright (C) 2004 Red Hat Inc.
+ * Copyright (C) 2010 TigerVNC Team
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -45,6 +47,7 @@ namespace rdr {
   struct FrameException : public Exception {
     FrameException(const char* s="Frame exception") : Exception(s) {}
   };
+
 }
 
 #endif

common/rdr/Makefile.am

@@ -3,11 +3,13 @@ noinst_LTLIBRARIES = librdr.la
 HDRS = Exception.h FdInStream.h FdOutStream.h FixedMemOutStream.h \
 	HexInStream.h HexOutStream.h InStream.h MemInStream.h \
 	MemOutStream.h msvcwarning.h OutStream.h RandomStream.h \
-	SubstitutingInStream.h types.h ZlibInStream.h ZlibOutStream.h
+	SubstitutingInStream.h types.h TLSException.h TLSInStream.h \
+	TLSOutStream.h ZlibInStream.h ZlibOutStream.h
 
 librdr_la_SOURCES = $(HDRS) Exception.cxx FdInStream.cxx FdOutStream.cxx \
-	InStream.cxx RandomStream.cxx ZlibInStream.cxx ZlibOutStream.cxx \
-	HexInStream.cxx HexOutStream.cxx
+	HexInStream.cxx HexOutStream.cxx InStream.cxx RandomStream.cxx \
+	TLSException.cxx TLSInStream.cxx TLSOutStream.cxx ZlibInStream.cxx \
+	ZlibOutStream.cxx
 
 librdr_la_CPPFLAGS = -I$(top_srcdir)/common
 librdr_la_LIBADD =

common/rdr/TLSException.cxx

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2004 Red Hat Inc.
+ * Copyright (C) 2010 TigerVNC Team
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <rdr/TLSException.h>
+
+#include <string.h>
+#include <stdio.h>
+#ifdef HAVE_GNUTLS
+#include <gnutls/gnutls.h>
+#endif
+
+using namespace rdr;
+
+#ifdef HAVE_GNUTLS
+TLSException::TLSException(const char* s, int err_)
+  : Exception(s), err(err_)
+{
+  strncat(str_, ": ", len-1-strlen(str_));
+  strncat(str_, gnutls_strerror(err), len-1-strlen(str_));
+  strncat(str_, " (", len-1-strlen(str_));
+  char buf[20];
+  sprintf(buf,"%d",err);
+  strncat(str_, buf, len-1-strlen(str_));
+  strncat(str_, ")", len-1-strlen(str_));
+}
+#endif /* HAVE_GNUTLS */
+

common/rdr/TLSException.h

@@ -0,0 +1,35 @@
+/* 
+ * Copyright (C) 2004 Red Hat Inc.
+ * Copyright (C) 2010 TigerVNC Team
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+#ifndef __RDR_TLSEXCEPTION_H__
+#define __RDR_TLSEXCEPTION_H__
+
+#include <rdr/Exception.h>
+
+namespace rdr {
+
+  struct TLSException : public Exception {
+    int err;
+    TLSException(const char* s, int err_);
+  };
+
+}
+
+#endif

common/rdr/TLSInStream.cxx

@@ -0,0 +1,111 @@
+/* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * Copyright (C) 2005 Martin Koegler
+ * Copyright (C) 2010 TigerVNC Team
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <rdr/Exception.h>
+#include <rdr/TLSException.h>
+#include <rdr/TLSInStream.h>
+#include <errno.h>
+
+#ifdef HAVE_GNUTLS 
+using namespace rdr;
+
+enum { DEFAULT_BUF_SIZE = 16384 };
+
+ssize_t rdr::gnutls_InStream_pull(gnutls_transport_ptr str, void* data,
+				  size_t size)
+{
+  InStream* in= (InStream*) str;
+
+  if (!in->check(1, 1, false)) {
+    errno=EAGAIN;
+    return -1;
+  }
+
+  if (in->getend() - in->getptr() < size)
+    size = in->getend() - in->getptr();
+  
+  in->readBytes(data, size);
+
+  return size;
+}
+
+TLSInStream::TLSInStream(InStream* _in, gnutls_session _session)
+  : session(_session), in(_in), bufSize(DEFAULT_BUF_SIZE), offset(0)
+{
+  ptr = end = start = new U8[bufSize];
+}
+
+TLSInStream::~TLSInStream()
+{
+  delete[] start;
+}
+
+int TLSInStream::pos()
+{
+  return offset + ptr - start;
+}
+
+int TLSInStream::overrun(int itemSize, int nItems, bool wait)
+{
+  if (itemSize > bufSize)
+    throw Exception("TLSInStream overrun: max itemSize exceeded");
+
+  if (end - ptr != 0)
+    memmove(start, ptr, end - ptr);
+
+  offset += ptr - start;
+  end -= ptr - start;
+  ptr = start;
+
+  while (end < start + itemSize) {
+    int n = readTLS((U8*) end, start + bufSize - end, wait);
+    if (!wait && n == 0)
+      return 0;
+    end += n;
+  }
+
+  if (itemSize * nItems > end - ptr)
+    nItems = (end - ptr) / itemSize;
+
+  return nItems;
+}
+
+int TLSInStream::readTLS(U8* buf, int len, bool wait)
+{
+  int n;
+
+  n = in->check(1, 1, wait);
+  if (n == 0)
+    return 0;
+
+  n = gnutls_record_recv(session, (void *) buf, len);
+  if (n == GNUTLS_E_INTERRUPTED || n == GNUTLS_E_AGAIN)
+    return 0;
+
+  if (n < 0) throw TLSException("readTLS", n);
+
+  return n;
+}
+
+#endif

common/rdr/TLSInStream.h

@@ -0,0 +1,57 @@
+/* Copyright (C) 2005 Martin Koegler
+ * Copyright (C) 2010 TigerVNC Team
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+#ifndef __RDR_TLSINSTREAM_H__
+#define __RDR_TLSINSTREAM_H__
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifdef HAVE_GNUTLS
+
+#include <gnutls/gnutls.h>
+#include <rdr/InStream.h>
+
+namespace rdr {
+
+  class TLSInStream : public InStream {
+  public:
+    TLSInStream(InStream* in, gnutls_session session);
+    virtual ~TLSInStream();
+
+    int pos();
+
+  private:
+    int overrun(int itemSize, int nItems, bool wait);
+    int readTLS(U8* buf, int len, bool wait);
+
+    gnutls_session session;
+    InStream* in;
+    int bufSize;
+    int offset;
+    U8* start;
+  };
+
+  ssize_t gnutls_InStream_pull(gnutls_transport_ptr,void*, size_t);
+
+};
+
+#endif
+#endif

common/rdr/TLSOutStream.cxx

@@ -0,0 +1,106 @@
+/* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * Copyright (C) 2005 Martin Koegler
+ * Copyright (C) 2010 TigerVNC Team
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <rdr/Exception.h>
+#include <rdr/TLSException.h>
+#include <rdr/TLSOutStream.h>
+
+#ifdef HAVE_GNUTLS
+using namespace rdr;
+
+enum { DEFAULT_BUF_SIZE = 16384 };
+
+ssize_t rdr::gnutls_OutStream_push(gnutls_transport_ptr str, const void* data,
+				   size_t size)
+{
+  OutStream* out = (OutStream*) str;
+  out->writeBytes(data, size);
+  out->flush();
+  return size;
+}
+
+TLSOutStream::TLSOutStream(OutStream* _out, gnutls_session _session)
+  : session(_session), out(_out), bufSize(DEFAULT_BUF_SIZE), offset(0)
+{
+  ptr = start = new U8[bufSize];
+  end = start + bufSize;
+}
+
+TLSOutStream::~TLSOutStream()
+{
+#if 0
+  try {
+//    flush();
+  } catch (Exception&) {
+  }
+#endif
+  delete [] start;
+}
+
+int TLSOutStream::length()
+{
+  return offset + ptr - start;
+}
+
+void TLSOutStream::flush()
+{
+  U8* sentUpTo = start;
+  while (sentUpTo < ptr) {
+    int n = writeTLS(sentUpTo, ptr - sentUpTo);
+    sentUpTo += n;
+    offset += n;
+  }
+
+  ptr = start;
+  out->flush();
+}
+
+int TLSOutStream::overrun(int itemSize, int nItems)
+{
+  if (itemSize > bufSize)
+    throw Exception("TLSOutStream overrun: max itemSize exceeded");
+
+  flush();
+
+  if (itemSize * nItems > end - ptr)
+    nItems = (end - ptr) / itemSize;
+
+  return nItems;
+}
+
+int TLSOutStream::writeTLS(const U8* data, int length)
+{
+  int n;
+
+  n = gnutls_record_send(session, data, length);
+  if (n == GNUTLS_E_INTERRUPTED || n == GNUTLS_E_AGAIN)
+    return 0;
+
+  if (n < 0)
+    throw TLSException("writeTLS", n);
+
+  return n;
+}
+
+#endif

common/rdr/TLSOutStream.h

@@ -0,0 +1,58 @@
+/* Copyright (C) 2005 Martin Koegler
+ * Copyright (C) 2010 TigerVNC Team
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+#ifndef __RDR_TLSOUTSTREAM_H__
+#define __RDR_TLSOUTSTREAM_H__
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifdef HAVE_GNUTLS
+#include <gnutls/gnutls.h>
+#include <rdr/OutStream.h>
+
+namespace rdr {
+
+  class TLSOutStream : public OutStream {
+  public:
+    TLSOutStream(OutStream* out, gnutls_session session);
+    virtual ~TLSOutStream();
+
+    void flush();
+    int length();
+
+  protected:
+    int overrun(int itemSize, int nItems);
+
+  private:
+    int writeTLS(const U8* data, int length);
+
+    gnutls_session session;
+    OutStream* out;
+    int bufSize;
+    U8* start;
+    int offset;
+  };
+
+  ssize_t gnutls_OutStream_push(gnutls_transport_ptr, const void*, size_t);
+};
+
+#endif
+#endif