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/*
* Copyright (c) 2010 SURFnet bv
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*****************************************************************************
SecureMemoryRegistry.cpp
Implements a singleton class that keeps track of all securely allocated
memory. This registry can be used to wipe securely allocated memory in case
of a fatal exception
*****************************************************************************/
#include <stdlib.h>
#include <string.h>
#include "log.h"
#include "SecureMemoryRegistry.h"
// Constructor
SecureMemoryRegistry::SecureMemoryRegistry()
{
SecMemRegistryMutex = MutexFactory::i()->getMutex();
}
// Destructor
SecureMemoryRegistry::~SecureMemoryRegistry()
{
if (!registry.empty())
{
ERROR_MSG("SecureMemoryRegistry is not empty: leak!");
}
MutexFactory::i()->recycleMutex(SecMemRegistryMutex);
}
// Return the one-and-only instance
SecureMemoryRegistry* SecureMemoryRegistry::i()
{
if (instance.get() == NULL)
{
instance.reset(new SecureMemoryRegistry());
if (instance.get() == NULL)
{
// This is very bad!
ERROR_MSG("failed to instantiate SecureMemoryRegistry");
}
}
return instance.get();
}
// This will destroy the one-and-only instance.
void SecureMemoryRegistry::reset()
{
instance.reset();
}
// Register a block of memory
void SecureMemoryRegistry::add(void* pointer, size_t blocksize)
{
MutexLocker lock(SecMemRegistryMutex);
registry[pointer] = blocksize;
//DEBUG_MSG("Registered block of %d bytes at 0x%x", blocksize, pointer);
}
// Unregister a block of memory
size_t SecureMemoryRegistry::remove(void* pointer)
{
//DEBUG_MSG("Unregistered block of %d bytes at 0x%x", registry[pointer], pointer);
MutexLocker lock(SecMemRegistryMutex);
size_t rv = registry[pointer];
registry.erase(pointer);
return rv;
}
// Wipe all registered blocks of memory
void SecureMemoryRegistry::wipe()
{
MutexLocker lock(SecMemRegistryMutex);
// Be very careful in this method to catch any weird exceptions that
// may occur since if we're in this method it means something has already
// gone pear shaped once before and we're exiting on a fatal exception
try
{
for (std::map<void*, size_t>::iterator i = registry.begin(); i != registry.end(); i++)
{
try
{
DEBUG_MSG("Wiping block of %d bytes at 0x%x", i->second, i->first);
}
catch (...)
{
}
try
{
#ifdef PARANOID
memset(i->first, 0xFF, i->second);
#endif // PARANOID
memset(i->first, 0x00, i->second);
}
catch (...)
{
ERROR_MSG("Failed to wipe block of %d bytes at 0x%x", i->second, i->first);
}
}
}
catch (...)
{
ERROR_MSG("Failed to enumerate the secure memory registry");
}
}
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