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/* $Id$ */
/** @file
* Main - Secret key interface.
*/
/*
* Copyright (C) 2015-2022 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
#include <VBox/err.h>
#include <VBox/log.h>
#include <iprt/assert.h>
#include <iprt/asm.h>
#include <iprt/memsafer.h>
#include "SecretKeyStore.h"
SecretKey::SecretKey(const uint8_t *pbKey, size_t cbKey, bool fKeyBufNonPageable)
{
m_cRefs = 0;
m_fRemoveOnSuspend = false;
m_cUsers = 0;
m_cbKey = cbKey;
int vrc = RTMemSaferAllocZEx((void **)&this->m_pbKey, cbKey,
fKeyBufNonPageable ? RTMEMSAFER_F_REQUIRE_NOT_PAGABLE : 0);
if (RT_SUCCESS(vrc))
{
memcpy(this->m_pbKey, pbKey, cbKey);
/* Scramble content to make retrieving the key more difficult. */
vrc = RTMemSaferScramble(this->m_pbKey, cbKey);
}
else
throw vrc;
}
SecretKey::~SecretKey()
{
Assert(!m_cRefs);
RTMemSaferFree(m_pbKey, m_cbKey);
m_cRefs = 0;
m_pbKey = NULL;
m_cbKey = 0;
m_fRemoveOnSuspend = false;
m_cUsers = 0;
}
uint32_t SecretKey::retain()
{
uint32_t cRefs = ASMAtomicIncU32(&m_cRefs);
if (cRefs == 1)
{
int vrc = RTMemSaferUnscramble(m_pbKey, m_cbKey);
AssertRC(vrc);
}
return cRefs;
}
uint32_t SecretKey::release()
{
uint32_t cRefs = ASMAtomicDecU32(&m_cRefs);
if (!cRefs)
{
int vrc = RTMemSaferScramble(m_pbKey, m_cbKey);
AssertRC(vrc);
}
return cRefs;
}
uint32_t SecretKey::refCount()
{
return m_cRefs;
}
int SecretKey::setUsers(uint32_t cUsers)
{
m_cUsers = cUsers;
return VINF_SUCCESS;
}
uint32_t SecretKey::getUsers()
{
return m_cUsers;
}
int SecretKey::setRemoveOnSuspend(bool fRemoveOnSuspend)
{
m_fRemoveOnSuspend = fRemoveOnSuspend;
return VINF_SUCCESS;
}
bool SecretKey::getRemoveOnSuspend()
{
return m_fRemoveOnSuspend;
}
const void *SecretKey::getKeyBuffer()
{
AssertReturn(m_cRefs > 0, NULL);
return m_pbKey;
}
size_t SecretKey::getKeySize()
{
return m_cbKey;
}
SecretKeyStore::SecretKeyStore(bool fKeyBufNonPageable)
{
m_fKeyBufNonPageable = fKeyBufNonPageable;
}
SecretKeyStore::~SecretKeyStore()
{
int vrc = deleteAllSecretKeys(false /* fSuspend */, true /* fForce */);
AssertRC(vrc);
}
int SecretKeyStore::addSecretKey(const com::Utf8Str &strKeyId, const uint8_t *pbKey, size_t cbKey)
{
/* Check that the ID is not existing already. */
SecretKeyMap::const_iterator it = m_mapSecretKeys.find(strKeyId);
if (it != m_mapSecretKeys.end())
return VERR_ALREADY_EXISTS;
SecretKey *pKey = NULL;
try
{
pKey = new SecretKey(pbKey, cbKey, m_fKeyBufNonPageable);
m_mapSecretKeys.insert(std::make_pair(strKeyId, pKey));
}
catch (int vrc)
{
return vrc;
}
catch (std::bad_alloc &)
{
if (pKey)
delete pKey;
return VERR_NO_MEMORY;
}
return VINF_SUCCESS;
}
int SecretKeyStore::deleteSecretKey(const com::Utf8Str &strKeyId)
{
SecretKeyMap::iterator it = m_mapSecretKeys.find(strKeyId);
if (it == m_mapSecretKeys.end())
return VERR_NOT_FOUND;
SecretKey *pKey = it->second;
if (pKey->refCount() != 0)
return VERR_RESOURCE_IN_USE;
m_mapSecretKeys.erase(it);
delete pKey;
return VINF_SUCCESS;
}
int SecretKeyStore::retainSecretKey(const com::Utf8Str &strKeyId, SecretKey **ppKey)
{
SecretKeyMap::const_iterator it = m_mapSecretKeys.find(strKeyId);
if (it == m_mapSecretKeys.end())
return VERR_NOT_FOUND;
SecretKey *pKey = it->second;
pKey->retain();
*ppKey = pKey;
return VINF_SUCCESS;
}
int SecretKeyStore::releaseSecretKey(const com::Utf8Str &strKeyId)
{
SecretKeyMap::const_iterator it = m_mapSecretKeys.find(strKeyId);
if (it == m_mapSecretKeys.end())
return VERR_NOT_FOUND;
SecretKey *pKey = it->second;
pKey->release();
return VINF_SUCCESS;
}
int SecretKeyStore::deleteAllSecretKeys(bool fSuspend, bool fForce)
{
/* First check whether a key is still in use. */
if (!fForce)
{
for (SecretKeyMap::iterator it = m_mapSecretKeys.begin();
it != m_mapSecretKeys.end();
++it)
{
SecretKey *pKey = it->second;
if ( pKey->refCount()
&& ( ( pKey->getRemoveOnSuspend()
&& fSuspend)
|| !fSuspend))
return VERR_RESOURCE_IN_USE;
}
}
SecretKeyMap::iterator it = m_mapSecretKeys.begin();
while (it != m_mapSecretKeys.end())
{
SecretKey *pKey = it->second;
if ( pKey->getRemoveOnSuspend()
|| !fSuspend)
{
AssertMsg(!pKey->refCount(), ("No one should access the stored key at this point anymore!\n"));
delete pKey;
SecretKeyMap::iterator itNext = it;
++itNext;
m_mapSecretKeys.erase(it);
it = itNext;
}
else
++it;
}
return VINF_SUCCESS;
}
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