Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1503564371-26090-14-git-send-email-armbru@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
283 lines
7.5 KiB
C
283 lines
7.5 KiB
C
/*
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* QEMU Crypto block device encryption
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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 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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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "crypto/blockpriv.h"
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#include "crypto/block-qcow.h"
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#include "crypto/block-luks.h"
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static const QCryptoBlockDriver *qcrypto_block_drivers[] = {
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[Q_CRYPTO_BLOCK_FORMAT_QCOW] = &qcrypto_block_driver_qcow,
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[Q_CRYPTO_BLOCK_FORMAT_LUKS] = &qcrypto_block_driver_luks,
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};
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bool qcrypto_block_has_format(QCryptoBlockFormat format,
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const uint8_t *buf,
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size_t len)
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{
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const QCryptoBlockDriver *driver;
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if (format >= G_N_ELEMENTS(qcrypto_block_drivers) ||
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!qcrypto_block_drivers[format]) {
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return false;
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}
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driver = qcrypto_block_drivers[format];
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return driver->has_format(buf, len);
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}
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QCryptoBlock *qcrypto_block_open(QCryptoBlockOpenOptions *options,
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const char *optprefix,
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QCryptoBlockReadFunc readfunc,
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void *opaque,
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unsigned int flags,
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Error **errp)
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{
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QCryptoBlock *block = g_new0(QCryptoBlock, 1);
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block->format = options->format;
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if (options->format >= G_N_ELEMENTS(qcrypto_block_drivers) ||
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!qcrypto_block_drivers[options->format]) {
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error_setg(errp, "Unsupported block driver %s",
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QCryptoBlockFormat_str(options->format));
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g_free(block);
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return NULL;
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}
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block->driver = qcrypto_block_drivers[options->format];
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if (block->driver->open(block, options, optprefix,
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readfunc, opaque, flags, errp) < 0) {
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g_free(block);
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return NULL;
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}
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return block;
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}
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QCryptoBlock *qcrypto_block_create(QCryptoBlockCreateOptions *options,
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const char *optprefix,
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QCryptoBlockInitFunc initfunc,
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QCryptoBlockWriteFunc writefunc,
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void *opaque,
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Error **errp)
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{
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QCryptoBlock *block = g_new0(QCryptoBlock, 1);
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block->format = options->format;
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if (options->format >= G_N_ELEMENTS(qcrypto_block_drivers) ||
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!qcrypto_block_drivers[options->format]) {
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error_setg(errp, "Unsupported block driver %s",
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QCryptoBlockFormat_str(options->format));
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g_free(block);
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return NULL;
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}
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block->driver = qcrypto_block_drivers[options->format];
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if (block->driver->create(block, options, optprefix, initfunc,
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writefunc, opaque, errp) < 0) {
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g_free(block);
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return NULL;
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}
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return block;
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}
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QCryptoBlockInfo *qcrypto_block_get_info(QCryptoBlock *block,
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Error **errp)
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{
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QCryptoBlockInfo *info = g_new0(QCryptoBlockInfo, 1);
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info->format = block->format;
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if (block->driver->get_info &&
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block->driver->get_info(block, info, errp) < 0) {
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g_free(info);
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return NULL;
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}
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return info;
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}
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int qcrypto_block_decrypt(QCryptoBlock *block,
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uint64_t startsector,
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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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return block->driver->decrypt(block, startsector, buf, len, errp);
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}
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int qcrypto_block_encrypt(QCryptoBlock *block,
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uint64_t startsector,
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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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return block->driver->encrypt(block, startsector, buf, len, errp);
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}
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QCryptoCipher *qcrypto_block_get_cipher(QCryptoBlock *block)
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{
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return block->cipher;
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}
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QCryptoIVGen *qcrypto_block_get_ivgen(QCryptoBlock *block)
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{
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return block->ivgen;
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}
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QCryptoHashAlgorithm qcrypto_block_get_kdf_hash(QCryptoBlock *block)
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{
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return block->kdfhash;
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}
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uint64_t qcrypto_block_get_payload_offset(QCryptoBlock *block)
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{
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return block->payload_offset;
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}
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void qcrypto_block_free(QCryptoBlock *block)
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{
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if (!block) {
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return;
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}
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block->driver->cleanup(block);
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qcrypto_cipher_free(block->cipher);
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qcrypto_ivgen_free(block->ivgen);
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g_free(block);
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}
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int qcrypto_block_decrypt_helper(QCryptoCipher *cipher,
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size_t niv,
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QCryptoIVGen *ivgen,
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int sectorsize,
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uint64_t startsector,
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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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uint8_t *iv;
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int ret = -1;
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iv = niv ? g_new0(uint8_t, niv) : NULL;
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while (len > 0) {
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size_t nbytes;
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if (niv) {
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if (qcrypto_ivgen_calculate(ivgen,
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startsector,
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iv, niv,
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errp) < 0) {
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goto cleanup;
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}
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if (qcrypto_cipher_setiv(cipher,
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iv, niv,
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errp) < 0) {
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goto cleanup;
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}
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}
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nbytes = len > sectorsize ? sectorsize : len;
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if (qcrypto_cipher_decrypt(cipher, buf, buf,
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nbytes, errp) < 0) {
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goto cleanup;
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}
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startsector++;
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buf += nbytes;
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len -= nbytes;
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}
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ret = 0;
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cleanup:
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g_free(iv);
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return ret;
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}
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int qcrypto_block_encrypt_helper(QCryptoCipher *cipher,
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size_t niv,
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QCryptoIVGen *ivgen,
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int sectorsize,
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uint64_t startsector,
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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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uint8_t *iv;
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int ret = -1;
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iv = niv ? g_new0(uint8_t, niv) : NULL;
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while (len > 0) {
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size_t nbytes;
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if (niv) {
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if (qcrypto_ivgen_calculate(ivgen,
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startsector,
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iv, niv,
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errp) < 0) {
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goto cleanup;
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}
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if (qcrypto_cipher_setiv(cipher,
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iv, niv,
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errp) < 0) {
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goto cleanup;
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}
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}
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nbytes = len > sectorsize ? sectorsize : len;
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if (qcrypto_cipher_encrypt(cipher, buf, buf,
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nbytes, errp) < 0) {
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goto cleanup;
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}
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startsector++;
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buf += nbytes;
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len -= nbytes;
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}
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ret = 0;
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cleanup:
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g_free(iv);
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return ret;
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}
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