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/* $Id: vboximgCrypto.h $ */
/** @file
* vboximgCrypto.h
*/
/*
* Copyright (C) 2008-2023 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
*/
#ifndef VBOX_INCLUDED_SRC_vboximg_mount_vboximgCrypto_h
#define VBOX_INCLUDED_SRC_vboximg_mount_vboximgCrypto_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <map>
/*
* Settings for a crypto filter instance.
*/
typedef struct VDiskCryptoSettings
{
VDiskCryptoSettings()
: fCreateKeyStore(false),
pszPassword(NULL),
pszKeyStore(NULL),
pszKeyStoreLoad(NULL),
pbDek(NULL),
cbDek(0),
pszCipher(NULL),
pszCipherReturned(NULL)
{ }
bool fCreateKeyStore;
const char *pszPassword;
char *pszKeyStore;
const char *pszKeyStoreLoad;
const uint8_t *pbDek;
size_t cbDek;
const char *pszCipher;
/** The cipher returned by the crypto filter. */
char *pszCipherReturned;
PVDINTERFACE vdFilterIfaces;
VDINTERFACECONFIG vdIfCfg;
VDINTERFACECRYPTO vdIfCrypto;
} VDISKCRYPTOSETTINGS;
class SecretKey
{
public:
/**
* Constructor for a secret key.
*
* @param pbKey The key buffer.
* @param cbKey Size of the key.
* @param fKeyBufNonPageable Flag whether the key buffer should be non pageable.
*/
SecretKey(const uint8_t *pbKey, size_t cbKey, bool fKeyBufNonPageable);
/**
* Secret key destructor.
*/
~SecretKey();
/**
* Increments the reference counter of the key.
*
* @returns The new reference count.
*/
uint32_t retain();
/**
* Releases a reference of the key.
* If the reference counter reaches 0 the key buffer might be protected
* against further access or the data will become scrambled.
*
* @returns The new reference count.
*/
uint32_t release();
/**
* Returns the reference count of the secret key.
*/
uint32_t refCount();
/**
* Sets the possible number of users for this key.
*
* @returns VBox status code.
* @param cUsers The possible number of user for this key.
*/
int setUsers(uint32_t cUsers);
/**
* Returns the possible amount of users.
*
* @returns Possible amount of users.
*/
uint32_t getUsers();
/**
* Sets the remove on suspend flag.
*
* @returns VBox status code.
* @param fRemoveOnSuspend Flag whether to remove the key on host suspend.
*/
int setRemoveOnSuspend(bool fRemoveOnSuspend);
/**
* Returns whether the key should be destroyed on suspend.
*/
bool getRemoveOnSuspend();
/**
* Returns the buffer to the key.
*/
const void *getKeyBuffer();
/**
* Returns the size of the key.
*/
size_t getKeySize();
private:
/** Reference counter of the key. */
volatile uint32_t m_cRefs;
/** Key material. */
uint8_t *m_pbKey;
/** Size of the key in bytes. */
size_t m_cbKey;
/** Flag whether to remove the key on suspend. */
bool m_fRemoveOnSuspend;
/** Number of entities which will use this key. */
uint32_t m_cUsers;
};
class SecretKeyStore
{
public:
/**
* Constructor for a secret key store.
*
* @param fKeyBufNonPageable Flag whether the key buffer is required to
* be non pageable.
*/
SecretKeyStore(bool fKeyBufNonPageable);
/**
* Destructor of a secret key store. This will free all stored secret keys
* inluding the key buffers. Make sure there no one accesses one of the keys
* stored.
*/
~SecretKeyStore();
/**
* Add a secret key to the store.
*
* @returns VBox status code.
* @param strKeyId The key identifier.
* @param pbKey The key to store.
* @param cbKey Size of the key.
*/
int addSecretKey(const com::Utf8Str &strKeyId, const uint8_t *pbKey, size_t cbKey);
/**
* Deletes a key from the key store associated with the given identifier.
*
* @returns VBox status code.
* @param strKeyId The key identifier.
*/
int deleteSecretKey(const com::Utf8Str &strKeyId);
/**
* Returns the secret key object associated with the given identifier.
* This increments the reference counter of the secret key object.
*
* @returns VBox status code.
* @param strKeyId The key identifier.
* @param ppKey Where to store the secret key object on success.
*/
int retainSecretKey(const com::Utf8Str &strKeyId, SecretKey **ppKey);
/**
* Releases a reference to the secret key object.
*
* @returns VBox status code.
* @param strKeyId The key identifier.
*/
int releaseSecretKey(const com::Utf8Str &strKeyId);
/**
* Deletes all secret keys from the key store.
*
* @returns VBox status code.
* @param fSuspend Flag whether to delete only keys which are
* marked for deletion during a suspend.
* @param fForce Flag whether to force deletion if some keys
* are still in use. Otherwise an error is returned.
*/
int deleteAllSecretKeys(bool fSuspend, bool fForce);
private:
typedef std::map<com::Utf8Str, SecretKey *> SecretKeyMap;
/** The map to map key identifers to secret keys. */
SecretKeyMap m_mapSecretKeys;
/** Flag whether key buffers should be non pagable. */
bool m_fKeyBufNonPageable;
};
void vboxImageCryptoSetup(VDISKCRYPTOSETTINGS *pSettings, const char *pszCipher,
const char *pszKeyStore, const char *pszPassword,
bool fCreateKeyStore);
DECLCALLBACK(bool) vboximgVdCryptoConfigAreKeysValid(void *pvUser, const char *pszzValid);
DECLCALLBACK(int) vboximgVdCryptoConfigQuerySize(void *pvUser, const char *pszName, size_t *pcbValue);
DECLCALLBACK(int) vboximgVdCryptoConfigQuery(void *pvUser, const char *pszName,
char *pszValue, size_t cchValue);
DECLCALLBACK(int) vboximgVdCryptoKeyRetain(void *pvUser, const char *pszId,
const uint8_t **ppbKey, size_t *pcbKey);
DECLCALLBACK(int) vboximgVdCryptoKeyRelease(void *pvUser, const char *pszId);
DECLCALLBACK(int) vboximgVdCryptoKeyStorePasswordRetain(void *pvUser, const char *pszId, const char **ppszPassword);
DECLCALLBACK(int) vboximgVdCryptoKeyStorePasswordRelease(void *pvUser, const char *pszId);
DECLCALLBACK(int) vboximgVdCryptoKeyStoreSave(void *pvUser, const void *pvKeyStore, size_t cbKeyStore);
DECLCALLBACK(int) vboximgVdCryptoKeyStoreReturnParameters(void *pvUser, const char *pszCipher,
const uint8_t *pbDek, size_t cbDek);
#endif /* !VBOX_INCLUDED_SRC_vboximg_mount_vboximgCrypto_h */
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