| 1 | /** @file
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| 2 | * VirtualBox - Cryptographic support functions Interface.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2022 Oracle Corporation
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| 7 | *
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| 8 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 9 | * available from http://www.virtualbox.org. This file is free software;
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| 10 | * you can redistribute it and/or modify it under the terms of the GNU
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| 11 | * General Public License (GPL) as published by the Free Software
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| 12 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 13 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 14 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 15 | *
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| 16 | * The contents of this file may alternatively be used under the terms
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| 17 | * of the Common Development and Distribution License Version 1.0
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| 18 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 19 | * VirtualBox OSE distribution, in which case the provisions of the
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| 20 | * CDDL are applicable instead of those of the GPL.
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| 21 | *
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| 22 | * You may elect to license modified versions of this file under the
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| 23 | * terms and conditions of either the GPL or the CDDL or both.
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| 24 | */
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| 25 |
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| 26 | #ifndef VBOX_INCLUDED_VBoxCryptoIf_h
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| 27 | #define VBOX_INCLUDED_VBoxCryptoIf_h
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| 28 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 29 | # pragma once
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| 30 | #endif
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| 31 |
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| 32 | #include <iprt/vfs.h>
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| 33 | #include <VBox/types.h>
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| 34 |
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| 35 | /** An opaque VBox cryptographic context handle. */
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| 36 | typedef struct VBOXCRYPTOCTXINT *VBOXCRYPTOCTX;
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| 37 | /**Pointer to an opaque VBox cryptographic context handle. */
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| 38 | typedef VBOXCRYPTOCTX *PVBOXCRYPTOCTX;
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| 39 |
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| 40 | /** Magic identifying the cryptographic interface (Charles Babbage). */
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| 41 | #define VBOXCRYPTOIF_MAGIC UINT32_C(0x17911226)
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| 42 |
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| 43 | /** Pointer to const cryptographic interface. */
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| 44 | typedef const struct VBOXCRYPTOIF *PCVBOXCRYPTOIF;
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| 45 | /**
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| 46 | * The main cryptographic callbacks interface table.
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| 47 | */
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| 48 | typedef struct VBOXCRYPTOIF
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| 49 | {
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| 50 | /** Interface magic, set to VBOXCRYPTOIF_MAGIC. */
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| 51 | uint32_t u32Magic;
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| 52 | /** Interface version.
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| 53 | * This is set to VBOXCRYPTOIF_VERSION. */
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| 54 | uint32_t u32Version;
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| 55 | /** Description string. */
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| 56 | const char *pszDesc;
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| 57 |
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| 58 | /** @name Generic crytographic context operations.
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| 59 | * @{ */
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| 60 |
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| 61 | /**
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| 62 | * Creates a new cryptographic context for encryption.
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| 63 | *
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| 64 | * @returns VBox status code.
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| 65 | * @param pszCipher The identifier of the cipher to use.
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| 66 | * @param pszPassword Password for encrypting the context.
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| 67 | * @param phCryptoCtx Where to store the handle to the crypto context on success.
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| 68 | */
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| 69 | DECLR3CALLBACKMEMBER(int, pfnCryptoCtxCreate, (const char *pszCipher, const char *pszPassword,
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| 70 | PVBOXCRYPTOCTX phCryptoCtx));
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| 71 |
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| 72 | /**
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| 73 | * Creates a new cryptographic context for decryption from the given base-64 encoded context.
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| 74 | *
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| 75 | * @returns VBox status code.
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| 76 | * @param pszStoredCtx The base-64 encoded context to decrypt with the given password.
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| 77 | * @param pszPassword Password for encrypting the context.
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| 78 | * @param phCryptoCtx Where to store the handle to the crypto context on success.
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| 79 | */
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| 80 | DECLR3CALLBACKMEMBER(int, pfnCryptoCtxLoad, (const char *pszStoredCtx, const char *pszPassword,
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| 81 | PVBOXCRYPTOCTX phCryptoCtx));
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| 82 |
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| 83 | /**
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| 84 | * Destroys a previously created cryptographic context.
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| 85 | *
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| 86 | * @returns VBox status code.
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| 87 | * @param hCryptoCtx Handle of crpytographic context to destroy.
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| 88 | */
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| 89 | DECLR3CALLBACKMEMBER(int, pfnCryptoCtxDestroy, (VBOXCRYPTOCTX hCryptoCtx));
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| 90 |
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| 91 | /**
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| 92 | * Returns the given cryptographic context as a base-64 encoded string.
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| 93 | *
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| 94 | * @returns VBox status code.
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| 95 | * @param hCryptoCtx Handle of crpytographic context.
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| 96 | * @param ppszStoredCtx Where to store the base-64 encoded cryptographic context on success.
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| 97 | * Must be freed with RTMemFree() when not required anymore.
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| 98 | */
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| 99 | DECLR3CALLBACKMEMBER(int, pfnCryptoCtxSave, (VBOXCRYPTOCTX hCryptoCtx, char **ppszStoredCtx));
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| 100 |
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| 101 | /**
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| 102 | * Changes the encryption password for the given context.
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| 103 | *
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| 104 | * @returns VBox status code.
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| 105 | * @param hCryptoCtx Handle of crpytographic context.
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| 106 | * @param pszPassword New password used for encrypting the DEK.
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| 107 | */
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| 108 | DECLR3CALLBACKMEMBER(int, pfnCryptoCtxPasswordChange, (VBOXCRYPTOCTX hCryptoCtx, const char *pszPassword));
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| 109 |
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| 110 | /**
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| 111 | * Queries the required size of the output buffer for encrypted data. Depends on the cipher.
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| 112 | *
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| 113 | * @returns VBox status code.
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| 114 | * @param hCryptoCtx Handle of crpytographic context.
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| 115 | * @param cbPlainText The size of the data to be encrypted.
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| 116 | * @param pcbEncrypted Where to store the size in bytes of the encrypted data on success.
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| 117 | */
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| 118 | DECLR3CALLBACKMEMBER(int, pfnCryptoCtxQueryEncryptedSz, (VBOXCRYPTOCTX hCryptoCtx, size_t cbPlaintext,
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| 119 | size_t *pcbEncrypted));
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| 120 |
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| 121 | /**
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| 122 | * Queries the required size of the output buffer for decrypted data. Depends on the cipher.
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| 123 | *
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| 124 | * @returns VBox status code.
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| 125 | * @param hCryptoCtx Handle of crpytographic context.
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| 126 | * @param cbEncrypted The size of the encrypted chunk before decryption.
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| 127 | * @param pcbPlaintext Where to store the size in bytes of the decrypted data on success.
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| 128 | */
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| 129 | DECLR3CALLBACKMEMBER(int, pfnCryptoCtxQueryDecryptedSz, (VBOXCRYPTOCTX hCryptoCtx, size_t cbEncrypted,
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| 130 | size_t *pcbPlaintext));
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| 131 |
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| 132 | /**
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| 133 | * Encrypts data.
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| 134 | *
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| 135 | * @returns VBox status code.
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| 136 | * @param hCryptoCtx Handle of crpytographic context.
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| 137 | * @param fPartial Only part of data to be encrypted is specified. The encryption
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| 138 | * cipher context will not be closed. Set to false for last piece
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| 139 | * of data, or if data is specified completely.
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| 140 | * Only CTR mode supports partial encryption.
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| 141 | * @param pvIV Pointer to IV. If null it will be generated.
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| 142 | * @param cbIV Size of the IV.
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| 143 | * @param pvPlainText Data to encrypt.
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| 144 | * @param cbPlainText Size of the data in the pvPlainText.
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| 145 | * @param pvAuthData Data used for authenticate the pvPlainText
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| 146 | * @param cbAuthData Size of the pvAuthData
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| 147 | * @param pvEncrypted Buffer to store encrypted data
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| 148 | * @param cbEncrypted Size of the buffer in pvEncrypted
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| 149 | * @param pcbEncrypted Placeholder where the size of the encrypted data returned.
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| 150 | */
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| 151 | DECLR3CALLBACKMEMBER(int, pfnCryptoCtxEncrypt, (VBOXCRYPTOCTX hCryptoCtx, bool fPartial, void const *pvIV, size_t cbIV,
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| 152 | void const *pvPlainText, size_t cbPlainText,
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| 153 | void const *pvAuthData, size_t cbAuthData,
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| 154 | void *pvEncrypted, size_t cbEncrypted,
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| 155 | size_t *pcbEncrypted));
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| 156 |
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| 157 | /**
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| 158 | * Decrypts data.
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| 159 | *
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| 160 | * @returns VBox status code.
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| 161 | * @param hCryptoCtx Handle of crpytographic context.
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| 162 | * @param fPartial Only part of data to be encrypted is specified. The encryption
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| 163 | * cipher context will not be closed. Set to false for last piece
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| 164 | * of data, or if data is specified completely.
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| 165 | * Only CTR mode supports partial encryption.
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| 166 | * @param pvEncrypted Data to decrypt.
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| 167 | * @param cbEncrypted Size of the data in the pvEncrypted.
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| 168 | * @param pvAuthData Data used for authenticate the pvEncrypted
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| 169 | * @param cbAuthData Size of the pvAuthData
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| 170 | * @param pvPlainText Buffer to store decrypted data
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| 171 | * @param cbPlainText Size of the buffer in pvPlainText
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| 172 | * @param pcbPlainText Placeholder where the size of the decrypted data returned.
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| 173 | */
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| 174 | DECLR3CALLBACKMEMBER(int, pfnCryptoCtxDecrypt, (VBOXCRYPTOCTX hCryptoCtx, bool fPartial,
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| 175 | void const *pvEncrypted, size_t cbEncrypted,
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| 176 | void const *pvAuthData, size_t cbAuthData,
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| 177 | void *pvPlainText, size_t cbPlainText, size_t *pcbPlainText));
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| 178 | /** @} */
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| 179 |
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| 180 | /** @name File based cryptographic operations.
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| 181 | * @{ */
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| 182 | /**
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| 183 | * Creates a new VFS file handle for an encrypted or to be encrypted file handle.
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| 184 | *
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| 185 | * @returns VBox status code.
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| 186 | * @param hVfsFile The input file handle, a new reference is retained upon success.
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| 187 | * @param pszKeyStore The key store containing the DEK used for encryption.
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| 188 | * @param pszPassword Password encrypting the DEK.
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| 189 | * @param phVfsFile Where to store the handle to the VFS file on success.
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| 190 | */
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| 191 | DECLR3CALLBACKMEMBER(int, pfnCryptoFileFromVfsFile, (RTVFSFILE hVfsFile, const char *pszKeyStore, const char *pszPassword,
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| 192 | PRTVFSFILE phVfsFile));
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| 193 |
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| 194 | /**
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| 195 | * Opens a new encryption I/O stream.
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| 196 | *
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| 197 | * @returns VBox status code.
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| 198 | * @param hVfsIosDst The encrypted output stream (must be writeable).
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| 199 | * The reference is not consumed, instead another
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| 200 | * one is retained.
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| 201 | * @param pszKeyStore The key store containing the DEK used for encryption.
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| 202 | * @param pszPassword Password encrypting the DEK.
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| 203 | * @param phVfsIosCrypt Where to return the crypting input I/O stream handle
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| 204 | * (you write to this).
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| 205 | */
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| 206 | DECLR3CALLBACKMEMBER(int, pfnCryptoIoStrmFromVfsIoStrmEncrypt, (RTVFSIOSTREAM hVfsIosDst, const char *pszKeyStore,
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| 207 | const char *pszPassword, PRTVFSIOSTREAM phVfsIosCrypt));
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| 208 |
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| 209 | /**
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| 210 | * Opens a new decryption I/O stream.
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| 211 | *
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| 212 | * @returns VBox status code.
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| 213 | * @param hVfsIosIn The encrypted input stream (must be readable).
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| 214 | * The reference is not consumed, instead another
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| 215 | * one is retained.
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| 216 | * @param pszKeyStore The key store containing the DEK used for encryption.
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| 217 | * @param pszPassword Password encrypting the DEK.
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| 218 | * @param phVfsIosOut Where to return the handle to the decrypted I/O stream (read).
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| 219 | */
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| 220 | DECLR3CALLBACKMEMBER(int, pfnCryptoIoStrmFromVfsIoStrmDecrypt, (RTVFSIOSTREAM hVfsIosIn, const char *pszKeyStore,
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| 221 | const char *pszPassword, PRTVFSIOSTREAM phVfsIosOut));
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| 222 | /** @} */
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| 223 |
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| 224 | /** @name Keystore related functions.
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| 225 | * @{ */
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| 226 | /**
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| 227 | * Return the encryption parameters and DEK from the base64 encoded key store data.
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| 228 | *
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| 229 | * @returns VBox status code.
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| 230 | * @param pszEnc The base64 encoded key store data.
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| 231 | * @param pszPassword The password to use for key decryption.
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| 232 | * If the password is NULL only the cipher is returned.
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| 233 | * @param ppbKey Where to store the DEK on success.
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| 234 | * Must be freed with RTMemSaferFree().
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| 235 | * @param pcbKey Where to store the DEK size in bytes on success.
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| 236 | * @param ppszCipher Where to store the used cipher for the decrypted DEK.
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| 237 | * Must be freed with RTStrFree().
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| 238 | */
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| 239 | DECLR3CALLBACKMEMBER(int, pfnCryptoKeyStoreGetDekFromEncoded, (const char *pszEnc, const char *pszPassword,
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| 240 | uint8_t **ppbKey, size_t *pcbKey, char **ppszCipher));
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| 241 |
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| 242 | /**
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| 243 | * Stores the given DEK in a key store protected by the given password.
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| 244 | *
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| 245 | * @returns VBox status code.
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| 246 | * @param pszPassword The password to protect the DEK.
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| 247 | * @param pbKey The DEK to protect.
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| 248 | * @param cbKey Size of the DEK to protect.
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| 249 | * @param pszCipher The cipher string associated with the DEK.
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| 250 | * @param ppszEnc Where to store the base64 encoded key store data on success.
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| 251 | * Must be freed with RTMemFree().
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| 252 | */
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| 253 | DECLR3CALLBACKMEMBER(int, pfnCryptoKeyStoreCreate, (const char *pszPassword, const uint8_t *pbKey, size_t cbKey,
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| 254 | const char *pszCipher, char **ppszEnc));
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| 255 | /** @} */
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| 256 |
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| 257 | DECLR3CALLBACKMEMBER(int, pfnReserved1,(void)); /**< Reserved for minor structure revisions. */
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| 258 | DECLR3CALLBACKMEMBER(int, pfnReserved2,(void)); /**< Reserved for minor structure revisions. */
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| 259 | DECLR3CALLBACKMEMBER(int, pfnReserved3,(void)); /**< Reserved for minor structure revisions. */
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| 260 | DECLR3CALLBACKMEMBER(int, pfnReserved4,(void)); /**< Reserved for minor structure revisions. */
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| 261 | DECLR3CALLBACKMEMBER(int, pfnReserved5,(void)); /**< Reserved for minor structure revisions. */
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| 262 | DECLR3CALLBACKMEMBER(int, pfnReserved6,(void)); /**< Reserved for minor structure revisions. */
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| 263 |
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| 264 | /** Reserved for minor structure revisions. */
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| 265 | uint32_t uReserved7;
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| 266 |
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| 267 | /** End of structure marker (VBOXCRYPTOIF_VERSION). */
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| 268 | uint32_t u32EndMarker;
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| 269 | } VBOXCRYPTOIF;
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| 270 | /** Current version of the VBOXCRYPTOIF structure. */
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| 271 | #define VBOXCRYPTOIF_VERSION RT_MAKE_U32(0, 1)
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| 272 |
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| 273 |
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| 274 | /**
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| 275 | * The VBoxCrypto entry callback function.
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| 276 | *
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| 277 | * @returns VBox status code.
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| 278 | * @param ppCryptoIf Where to store the pointer to the crypto module interface callback table
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| 279 | * on success.
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| 280 | */
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| 281 | typedef DECLCALLBACKTYPE(int, FNVBOXCRYPTOENTRY,(PCVBOXCRYPTOIF *ppCryptoIf));
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| 282 | /** Pointer to a FNVBOXCRYPTOENTRY. */
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| 283 | typedef FNVBOXCRYPTOENTRY *PFNVBOXCRYPTOENTRY;
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| 284 |
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| 285 | /** The name of the crypto module entry point. */
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| 286 | #define VBOX_CRYPTO_MOD_ENTRY_POINT "VBoxCryptoEntry"
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| 287 |
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| 288 |
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| 289 | /**
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| 290 | * Checks if cryptographic interface version is compatible.
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| 291 | *
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| 292 | * @returns true if the do, false if they don't.
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| 293 | * @param u32Provider The provider version.
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| 294 | * @param u32User The user version.
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| 295 | */
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| 296 | #define VBOXCRYPTO_IS_VER_COMPAT(u32Provider, u32User) \
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| 297 | ( VBOXCRYPTO_IS_MAJOR_VER_EQUAL(u32Provider, u32User) \
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| 298 | && (int32_t)RT_LOWORD(u32Provider) >= (int32_t)RT_LOWORD(u32User) ) /* stupid casts to shut up gcc */
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| 299 |
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| 300 | /**
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| 301 | * Check if two cryptographic interface versions have the same major version.
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| 302 | *
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| 303 | * @returns true if the do, false if they don't.
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| 304 | * @param u32Ver1 The first version number.
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| 305 | * @param u32Ver2 The second version number.
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| 306 | */
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| 307 | #define VBOXCRYPTO_IS_MAJOR_VER_EQUAL(u32Ver1, u32Ver2) (RT_HIWORD(u32Ver1) == RT_HIWORD(u32Ver2))
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| 308 |
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| 309 | #endif /* !VBOX_INCLUDED_VBoxCryptoIf_h */
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| 310 |
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