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https://gitlab.com/qemu-project/qemu
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![Thomas Huth](/assets/img/avatar_default.png)
It's either "GNU *Library* General Public License version 2" or "GNU Lesser General Public License version *2.1*", but there was no "version 2.0" of the "Lesser" license. So assume that version 2.1 is meant here. Signed-off-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
186 lines
5.7 KiB
C
186 lines
5.7 KiB
C
/*
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* QEMU Crypto block device encryption QCow/QCow2 AES-CBC format
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*
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* Copyright (c) 2015-2016 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/*
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* Note that the block encryption implemented in this file is broken
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* by design. This exists only to allow data to be liberated from
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* existing qcow[2] images and should not be used in any new areas.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "block-qcow.h"
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#include "crypto/secret.h"
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#define QCRYPTO_BLOCK_QCOW_SECTOR_SIZE 512
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static bool
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qcrypto_block_qcow_has_format(const uint8_t *buf G_GNUC_UNUSED,
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size_t buf_size G_GNUC_UNUSED)
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{
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return false;
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}
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static int
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qcrypto_block_qcow_init(QCryptoBlock *block,
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const char *keysecret,
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size_t n_threads,
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Error **errp)
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{
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char *password;
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int ret;
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uint8_t keybuf[16];
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int len;
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memset(keybuf, 0, 16);
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password = qcrypto_secret_lookup_as_utf8(keysecret, errp);
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if (!password) {
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return -1;
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}
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len = strlen(password);
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memcpy(keybuf, password, MIN(len, sizeof(keybuf)));
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g_free(password);
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block->niv = qcrypto_cipher_get_iv_len(QCRYPTO_CIPHER_ALG_AES_128,
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QCRYPTO_CIPHER_MODE_CBC);
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block->ivgen = qcrypto_ivgen_new(QCRYPTO_IVGEN_ALG_PLAIN64,
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0, 0, NULL, 0, errp);
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if (!block->ivgen) {
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ret = -ENOTSUP;
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goto fail;
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}
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ret = qcrypto_block_init_cipher(block, QCRYPTO_CIPHER_ALG_AES_128,
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QCRYPTO_CIPHER_MODE_CBC,
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keybuf, G_N_ELEMENTS(keybuf),
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n_threads, errp);
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if (ret < 0) {
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ret = -ENOTSUP;
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goto fail;
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}
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block->sector_size = QCRYPTO_BLOCK_QCOW_SECTOR_SIZE;
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block->payload_offset = 0;
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return 0;
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fail:
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qcrypto_block_free_cipher(block);
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qcrypto_ivgen_free(block->ivgen);
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return ret;
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}
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static int
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qcrypto_block_qcow_open(QCryptoBlock *block,
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QCryptoBlockOpenOptions *options,
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const char *optprefix,
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QCryptoBlockReadFunc readfunc G_GNUC_UNUSED,
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void *opaque G_GNUC_UNUSED,
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unsigned int flags,
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size_t n_threads,
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Error **errp)
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{
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if (flags & QCRYPTO_BLOCK_OPEN_NO_IO) {
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block->sector_size = QCRYPTO_BLOCK_QCOW_SECTOR_SIZE;
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block->payload_offset = 0;
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return 0;
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} else {
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if (!options->u.qcow.key_secret) {
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error_setg(errp,
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"Parameter '%skey-secret' is required for cipher",
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optprefix ? optprefix : "");
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return -1;
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}
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return qcrypto_block_qcow_init(block, options->u.qcow.key_secret,
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n_threads, errp);
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}
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}
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static int
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qcrypto_block_qcow_create(QCryptoBlock *block,
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QCryptoBlockCreateOptions *options,
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const char *optprefix,
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QCryptoBlockInitFunc initfunc G_GNUC_UNUSED,
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QCryptoBlockWriteFunc writefunc G_GNUC_UNUSED,
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void *opaque G_GNUC_UNUSED,
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Error **errp)
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{
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if (!options->u.qcow.key_secret) {
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error_setg(errp, "Parameter '%skey-secret' is required for cipher",
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optprefix ? optprefix : "");
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return -1;
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}
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/* QCow2 has no special header, since everything is hardwired */
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return qcrypto_block_qcow_init(block, options->u.qcow.key_secret, 1, errp);
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}
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static void
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qcrypto_block_qcow_cleanup(QCryptoBlock *block)
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{
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}
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static int
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qcrypto_block_qcow_decrypt(QCryptoBlock *block,
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uint64_t offset,
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uint8_t *buf,
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size_t len,
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Error **errp)
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{
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assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
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assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
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return qcrypto_block_decrypt_helper(block,
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QCRYPTO_BLOCK_QCOW_SECTOR_SIZE,
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offset, buf, len, errp);
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}
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static int
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qcrypto_block_qcow_encrypt(QCryptoBlock *block,
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uint64_t offset,
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uint8_t *buf,
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size_t len,
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Error **errp)
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{
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assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
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assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
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return qcrypto_block_encrypt_helper(block,
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QCRYPTO_BLOCK_QCOW_SECTOR_SIZE,
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offset, buf, len, errp);
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}
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const QCryptoBlockDriver qcrypto_block_driver_qcow = {
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.open = qcrypto_block_qcow_open,
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.create = qcrypto_block_qcow_create,
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.cleanup = qcrypto_block_qcow_cleanup,
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.decrypt = qcrypto_block_qcow_decrypt,
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.encrypt = qcrypto_block_qcow_encrypt,
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.has_format = qcrypto_block_qcow_has_format,
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};
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