diff options
Diffstat (limited to 'src/VBox/ImageMounter/vboximg-mount/vboximgCrypto.cpp')
| -rw-r--r-- | src/VBox/ImageMounter/vboximg-mount/vboximgCrypto.cpp | 422 |
1 files changed, 422 insertions, 0 deletions
diff --git a/src/VBox/ImageMounter/vboximg-mount/vboximgCrypto.cpp b/src/VBox/ImageMounter/vboximg-mount/vboximgCrypto.cpp new file mode 100644 index 00000000..88988faf --- /dev/null +++ b/src/VBox/ImageMounter/vboximg-mount/vboximgCrypto.cpp @@ -0,0 +1,422 @@ +/* $Id: vboximgCrypto.cpp $ */ + +/** @file + * vboximgCypto.cpp - Disk Image Flattening FUSE Program. + */ + +/* + * Copyright (C) 2009-2022 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program 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, in version 3 of the + * License. + * + * This program 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 program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#include <iprt/cdefs.h> +#include <VBox/err.h> +#include <VBox/settings.h> +#include <VBox/vd.h> +#include "vboximgCrypto.h" +#include <VBox/log.h> +#include <iprt/assert.h> +#include <iprt/asm.h> +#include <iprt/memsafer.h> + +/* + * Apparently there is a more COM:: oriented (but less efficient?) approach to dealing + * with the keystore and disk encryption, which will need to be investigated. Keeping + * all this duplicated code in a separate file until the ideal approach is determined. + */ +SecretKey::SecretKey(const uint8_t *pbKey, size_t cbKey, bool fKeyBufNonPageable) +{ + m_cRefs = 0; + m_fRemoveOnSuspend = false; + m_cUsers = 0; + m_cbKey = cbKey; + + int rc = RTMemSaferAllocZEx((void **)&this->m_pbKey, cbKey, + fKeyBufNonPageable ? RTMEMSAFER_F_REQUIRE_NOT_PAGABLE : 0); + if (RT_SUCCESS(rc)) + { + memcpy(this->m_pbKey, pbKey, cbKey); + + /* Scramble content to make retrieving the key more difficult. */ + rc = RTMemSaferScramble(this->m_pbKey, cbKey); + } + else + throw rc; +} + +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 rc = RTMemSaferUnscramble(m_pbKey, m_cbKey); + AssertRC(rc); + } + + return cRefs; +} + +uint32_t SecretKey::release() +{ + uint32_t cRefs = ASMAtomicDecU32(&m_cRefs); + if (!cRefs) + { + int rc = RTMemSaferScramble(m_pbKey, m_cbKey); + AssertRC(rc); + } + + 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 rc = deleteAllSecretKeys(false /* fSuspend */, true /* fForce */); + AssertRC(rc); +} + +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 rc) + { + return rc; + } + 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; +} + +void vboxImageCryptoSetup(VDISKCRYPTOSETTINGS *pSettings, const char *pszCipher, + const char *pszKeyStore, const char *pszPassword, + bool fCreateKeyStore) +{ + pSettings->pszCipher = pszCipher; + pSettings->pszPassword = pszPassword; + pSettings->pszKeyStoreLoad = pszKeyStore; + pSettings->fCreateKeyStore = fCreateKeyStore; + pSettings->pbDek = NULL; + pSettings->cbDek = 0; + pSettings->vdFilterIfaces = NULL; + + pSettings->vdIfCfg.pfnAreKeysValid = vboximgVdCryptoConfigAreKeysValid; + pSettings->vdIfCfg.pfnQuerySize = vboximgVdCryptoConfigQuerySize; + pSettings->vdIfCfg.pfnQuery = vboximgVdCryptoConfigQuery; + pSettings->vdIfCfg.pfnQueryBytes = NULL; + + pSettings->vdIfCrypto.pfnKeyRetain = vboximgVdCryptoKeyRetain; + pSettings->vdIfCrypto.pfnKeyRelease = vboximgVdCryptoKeyRelease; + pSettings->vdIfCrypto.pfnKeyStorePasswordRetain = vboximgVdCryptoKeyStorePasswordRetain; + pSettings->vdIfCrypto.pfnKeyStorePasswordRelease = vboximgVdCryptoKeyStorePasswordRelease; + pSettings->vdIfCrypto.pfnKeyStoreSave = vboximgVdCryptoKeyStoreSave; + pSettings->vdIfCrypto.pfnKeyStoreReturnParameters = vboximgVdCryptoKeyStoreReturnParameters; + + int rc = VDInterfaceAdd(&pSettings->vdIfCfg.Core, + "vboximgVdInterfaceCfgCrypto", + VDINTERFACETYPE_CONFIG, pSettings, + sizeof(VDINTERFACECONFIG), &pSettings->vdFilterIfaces); + AssertRC(rc); + + rc = VDInterfaceAdd(&pSettings->vdIfCrypto.Core, + "vboximgVdInterfaceCrypto", + VDINTERFACETYPE_CRYPTO, pSettings, + sizeof(VDINTERFACECRYPTO), &pSettings->vdFilterIfaces); + AssertRC(rc); +} + +DECLCALLBACK(bool) vboximgVdCryptoConfigAreKeysValid(void *pvUser, const char *pszzValid) +{ + /* Just return always true here. */ + NOREF(pvUser); + NOREF(pszzValid); + return true; +} + +DECLCALLBACK(int) vboximgVdCryptoConfigQuerySize(void *pvUser, const char *pszName, size_t *pcbValue) +{ + VDISKCRYPTOSETTINGS *pSettings = (VDISKCRYPTOSETTINGS *)pvUser; + AssertPtrReturn(pSettings, VERR_GENERAL_FAILURE); + AssertPtrReturn(pcbValue, VERR_INVALID_POINTER); + + size_t cbValue = 0; + if (!strcmp(pszName, "Algorithm")) + cbValue = strlen(pSettings->pszCipher) + 1; + else if (!strcmp(pszName, "KeyId")) + cbValue = sizeof("irrelevant"); + else if (!strcmp(pszName, "KeyStore")) + { + if (!pSettings->pszKeyStoreLoad) + return VERR_CFGM_VALUE_NOT_FOUND; + cbValue = strlen(pSettings->pszKeyStoreLoad) + 1; + } + else if (!strcmp(pszName, "CreateKeyStore")) + cbValue = 2; /* Single digit + terminator. */ + else + return VERR_CFGM_VALUE_NOT_FOUND; + + *pcbValue = cbValue + 1 /* include terminator */; + + return VINF_SUCCESS; +} + +DECLCALLBACK(int) vboximgVdCryptoConfigQuery(void *pvUser, const char *pszName, + char *pszValue, size_t cchValue) +{ + VDISKCRYPTOSETTINGS *pSettings = (VDISKCRYPTOSETTINGS *)pvUser; + AssertPtrReturn(pSettings, VERR_GENERAL_FAILURE); + AssertPtrReturn(pszValue, VERR_INVALID_POINTER); + + const char *psz = NULL; + if (!strcmp(pszName, "Algorithm")) + psz = pSettings->pszCipher; + else if (!strcmp(pszName, "KeyId")) + psz = "irrelevant"; + else if (!strcmp(pszName, "KeyStore")) + psz = pSettings->pszKeyStoreLoad; + else if (!strcmp(pszName, "CreateKeyStore")) + { + if (pSettings->fCreateKeyStore) + psz = "1"; + else + psz = "0"; + } + else + return VERR_CFGM_VALUE_NOT_FOUND; + + size_t cch = strlen(psz); + if (cch >= cchValue) + return VERR_CFGM_NOT_ENOUGH_SPACE; + + memcpy(pszValue, psz, cch + 1); + return VINF_SUCCESS; +} + +DECLCALLBACK(int) vboximgVdCryptoKeyRetain(void *pvUser, const char *pszId, + const uint8_t **ppbKey, size_t *pcbKey) +{ + VDISKCRYPTOSETTINGS *pSettings = (VDISKCRYPTOSETTINGS *)pvUser; + NOREF(pszId); + NOREF(ppbKey); + NOREF(pcbKey); + AssertPtrReturn(pSettings, VERR_GENERAL_FAILURE); + AssertMsgFailedReturn(("This method should not be called here!\n"), VERR_INVALID_STATE); +} + +DECLCALLBACK(int) vboximgVdCryptoKeyRelease(void *pvUser, const char *pszId) +{ + VDISKCRYPTOSETTINGS *pSettings = (VDISKCRYPTOSETTINGS *)pvUser; + NOREF(pszId); + AssertPtrReturn(pSettings, VERR_GENERAL_FAILURE); + AssertMsgFailedReturn(("This method should not be called here!\n"), VERR_INVALID_STATE); +} + +DECLCALLBACK(int) vboximgVdCryptoKeyStorePasswordRetain(void *pvUser, const char *pszId, const char **ppszPassword) +{ + VDISKCRYPTOSETTINGS *pSettings = (VDISKCRYPTOSETTINGS *)pvUser; + AssertPtrReturn(pSettings, VERR_GENERAL_FAILURE); + + NOREF(pszId); + *ppszPassword = pSettings->pszPassword; + return VINF_SUCCESS; +} + +DECLCALLBACK(int) vboximgVdCryptoKeyStorePasswordRelease(void *pvUser, const char *pszId) +{ + VDISKCRYPTOSETTINGS *pSettings = (VDISKCRYPTOSETTINGS *)pvUser; + AssertPtrReturn(pSettings, VERR_GENERAL_FAILURE); + NOREF(pszId); + return VINF_SUCCESS; +} + +DECLCALLBACK(int) vboximgVdCryptoKeyStoreSave(void *pvUser, const void *pvKeyStore, size_t cbKeyStore) +{ + VDISKCRYPTOSETTINGS *pSettings = (VDISKCRYPTOSETTINGS *)pvUser; + AssertPtrReturn(pSettings, VERR_GENERAL_FAILURE); + + pSettings->pszKeyStore = (char *)RTMemAllocZ(cbKeyStore); + if (!pSettings->pszKeyStore) + return VERR_NO_MEMORY; + + memcpy(pSettings->pszKeyStore, pvKeyStore, cbKeyStore); + return VINF_SUCCESS; +} + +DECLCALLBACK(int) vboximgVdCryptoKeyStoreReturnParameters(void *pvUser, const char *pszCipher, + const uint8_t *pbDek, size_t cbDek) +{ + VDISKCRYPTOSETTINGS *pSettings = (VDISKCRYPTOSETTINGS *)pvUser; + AssertPtrReturn(pSettings, VERR_GENERAL_FAILURE); + + pSettings->pszCipherReturned = RTStrDup(pszCipher); + pSettings->pbDek = pbDek; + pSettings->cbDek = cbDek; + + return pSettings->pszCipherReturned ? VINF_SUCCESS : VERR_NO_MEMORY; +} |