Commit e39e959e
fixed an invalid assertion in the .bdrv_length
implementation, but left a similar assertion in place for
.bdrv_truncate. Instead of crashing when the user requests a too large
image size, fail gracefully.
A file size of exactly INT64_MAX caused failure before, but is actually
legal.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
715 lines
20 KiB
C
715 lines
20 KiB
C
/*
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* QEMU block full disk 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 "block/block_int.h"
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#include "sysemu/block-backend.h"
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#include "crypto/block.h"
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#include "qapi/opts-visitor.h"
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#include "qapi/qapi-visit-crypto.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qobject-input-visitor.h"
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#include "qapi/error.h"
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#include "qemu/option.h"
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#include "block/crypto.h"
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typedef struct BlockCrypto BlockCrypto;
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struct BlockCrypto {
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QCryptoBlock *block;
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};
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static int block_crypto_probe_generic(QCryptoBlockFormat format,
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const uint8_t *buf,
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int buf_size,
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const char *filename)
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{
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if (qcrypto_block_has_format(format, buf, buf_size)) {
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return 100;
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} else {
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return 0;
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}
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}
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static ssize_t block_crypto_read_func(QCryptoBlock *block,
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size_t offset,
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uint8_t *buf,
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size_t buflen,
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void *opaque,
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Error **errp)
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{
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BlockDriverState *bs = opaque;
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ssize_t ret;
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ret = bdrv_pread(bs->file, offset, buf, buflen);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Could not read encryption header");
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return ret;
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}
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return ret;
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}
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struct BlockCryptoCreateData {
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BlockBackend *blk;
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uint64_t size;
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};
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static ssize_t block_crypto_write_func(QCryptoBlock *block,
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size_t offset,
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const uint8_t *buf,
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size_t buflen,
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void *opaque,
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Error **errp)
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{
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struct BlockCryptoCreateData *data = opaque;
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ssize_t ret;
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ret = blk_pwrite(data->blk, offset, buf, buflen, 0);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Could not write encryption header");
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return ret;
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}
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return ret;
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}
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static ssize_t block_crypto_init_func(QCryptoBlock *block,
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size_t headerlen,
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void *opaque,
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Error **errp)
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{
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struct BlockCryptoCreateData *data = opaque;
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if (data->size > INT64_MAX || headerlen > INT64_MAX - data->size) {
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error_setg(errp, "The requested file size is too large");
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return -EFBIG;
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}
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/* User provided size should reflect amount of space made
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* available to the guest, so we must take account of that
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* which will be used by the crypto header
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*/
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return blk_truncate(data->blk, data->size + headerlen, PREALLOC_MODE_OFF,
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errp);
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}
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static QemuOptsList block_crypto_runtime_opts_luks = {
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.name = "crypto",
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.head = QTAILQ_HEAD_INITIALIZER(block_crypto_runtime_opts_luks.head),
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.desc = {
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BLOCK_CRYPTO_OPT_DEF_LUKS_KEY_SECRET(""),
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{ /* end of list */ }
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},
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};
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static QemuOptsList block_crypto_create_opts_luks = {
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.name = "crypto",
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.head = QTAILQ_HEAD_INITIALIZER(block_crypto_create_opts_luks.head),
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.desc = {
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{
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.name = BLOCK_OPT_SIZE,
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.type = QEMU_OPT_SIZE,
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.help = "Virtual disk size"
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},
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BLOCK_CRYPTO_OPT_DEF_LUKS_KEY_SECRET(""),
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BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_ALG(""),
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BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_MODE(""),
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BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_ALG(""),
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BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_HASH_ALG(""),
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BLOCK_CRYPTO_OPT_DEF_LUKS_HASH_ALG(""),
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BLOCK_CRYPTO_OPT_DEF_LUKS_ITER_TIME(""),
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{ /* end of list */ }
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},
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};
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QCryptoBlockOpenOptions *
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block_crypto_open_opts_init(QCryptoBlockFormat format,
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QDict *opts,
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Error **errp)
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{
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Visitor *v;
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QCryptoBlockOpenOptions *ret = NULL;
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Error *local_err = NULL;
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ret = g_new0(QCryptoBlockOpenOptions, 1);
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ret->format = format;
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v = qobject_input_visitor_new_keyval(QOBJECT(opts));
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visit_start_struct(v, NULL, NULL, 0, &local_err);
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if (local_err) {
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goto out;
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}
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switch (format) {
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case Q_CRYPTO_BLOCK_FORMAT_LUKS:
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visit_type_QCryptoBlockOptionsLUKS_members(
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v, &ret->u.luks, &local_err);
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break;
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case Q_CRYPTO_BLOCK_FORMAT_QCOW:
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visit_type_QCryptoBlockOptionsQCow_members(
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v, &ret->u.qcow, &local_err);
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break;
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default:
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error_setg(&local_err, "Unsupported block format %d", format);
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break;
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}
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if (!local_err) {
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visit_check_struct(v, &local_err);
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}
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visit_end_struct(v, NULL);
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out:
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if (local_err) {
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error_propagate(errp, local_err);
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qapi_free_QCryptoBlockOpenOptions(ret);
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ret = NULL;
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}
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visit_free(v);
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return ret;
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}
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QCryptoBlockCreateOptions *
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block_crypto_create_opts_init(QCryptoBlockFormat format,
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QDict *opts,
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Error **errp)
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{
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Visitor *v;
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QCryptoBlockCreateOptions *ret = NULL;
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Error *local_err = NULL;
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ret = g_new0(QCryptoBlockCreateOptions, 1);
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ret->format = format;
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v = qobject_input_visitor_new_keyval(QOBJECT(opts));
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visit_start_struct(v, NULL, NULL, 0, &local_err);
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if (local_err) {
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goto out;
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}
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switch (format) {
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case Q_CRYPTO_BLOCK_FORMAT_LUKS:
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visit_type_QCryptoBlockCreateOptionsLUKS_members(
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v, &ret->u.luks, &local_err);
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break;
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case Q_CRYPTO_BLOCK_FORMAT_QCOW:
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visit_type_QCryptoBlockOptionsQCow_members(
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v, &ret->u.qcow, &local_err);
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break;
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default:
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error_setg(&local_err, "Unsupported block format %d", format);
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break;
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}
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if (!local_err) {
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visit_check_struct(v, &local_err);
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}
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visit_end_struct(v, NULL);
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out:
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if (local_err) {
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error_propagate(errp, local_err);
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qapi_free_QCryptoBlockCreateOptions(ret);
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ret = NULL;
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}
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visit_free(v);
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return ret;
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}
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static int block_crypto_open_generic(QCryptoBlockFormat format,
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QemuOptsList *opts_spec,
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BlockDriverState *bs,
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QDict *options,
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int flags,
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Error **errp)
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{
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BlockCrypto *crypto = bs->opaque;
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QemuOpts *opts = NULL;
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Error *local_err = NULL;
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int ret = -EINVAL;
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QCryptoBlockOpenOptions *open_opts = NULL;
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unsigned int cflags = 0;
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QDict *cryptoopts = NULL;
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bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
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false, errp);
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if (!bs->file) {
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return -EINVAL;
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}
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bs->supported_write_flags = BDRV_REQ_FUA &
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bs->file->bs->supported_write_flags;
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opts = qemu_opts_create(opts_spec, NULL, 0, &error_abort);
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qemu_opts_absorb_qdict(opts, options, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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goto cleanup;
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}
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cryptoopts = qemu_opts_to_qdict(opts, NULL);
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open_opts = block_crypto_open_opts_init(format, cryptoopts, errp);
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if (!open_opts) {
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goto cleanup;
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}
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if (flags & BDRV_O_NO_IO) {
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cflags |= QCRYPTO_BLOCK_OPEN_NO_IO;
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}
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crypto->block = qcrypto_block_open(open_opts, NULL,
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block_crypto_read_func,
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bs,
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cflags,
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errp);
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if (!crypto->block) {
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ret = -EIO;
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goto cleanup;
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}
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bs->encrypted = true;
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ret = 0;
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cleanup:
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QDECREF(cryptoopts);
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qapi_free_QCryptoBlockOpenOptions(open_opts);
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return ret;
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}
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static int block_crypto_co_create_generic(BlockDriverState *bs,
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int64_t size,
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QCryptoBlockCreateOptions *opts,
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Error **errp)
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{
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int ret;
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BlockBackend *blk;
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QCryptoBlock *crypto = NULL;
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struct BlockCryptoCreateData data;
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blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL);
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ret = blk_insert_bs(blk, bs, errp);
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if (ret < 0) {
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goto cleanup;
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}
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data = (struct BlockCryptoCreateData) {
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.blk = blk,
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.size = size,
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};
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crypto = qcrypto_block_create(opts, NULL,
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block_crypto_init_func,
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block_crypto_write_func,
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&data,
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errp);
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if (!crypto) {
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ret = -EIO;
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goto cleanup;
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}
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ret = 0;
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cleanup:
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qcrypto_block_free(crypto);
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blk_unref(blk);
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return ret;
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}
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static int block_crypto_truncate(BlockDriverState *bs, int64_t offset,
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PreallocMode prealloc, Error **errp)
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{
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BlockCrypto *crypto = bs->opaque;
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uint64_t payload_offset =
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qcrypto_block_get_payload_offset(crypto->block);
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if (payload_offset > INT64_MAX - offset) {
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error_setg(errp, "The requested file size is too large");
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return -EFBIG;
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}
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offset += payload_offset;
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return bdrv_truncate(bs->file, offset, prealloc, errp);
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}
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static void block_crypto_close(BlockDriverState *bs)
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{
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BlockCrypto *crypto = bs->opaque;
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qcrypto_block_free(crypto->block);
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}
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static int block_crypto_reopen_prepare(BDRVReopenState *state,
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BlockReopenQueue *queue, Error **errp)
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{
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/* nothing needs checking */
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return 0;
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}
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/*
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* 1 MB bounce buffer gives good performance / memory tradeoff
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* when using cache=none|directsync.
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*/
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#define BLOCK_CRYPTO_MAX_IO_SIZE (1024 * 1024)
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static coroutine_fn int
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block_crypto_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
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QEMUIOVector *qiov, int flags)
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{
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BlockCrypto *crypto = bs->opaque;
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uint64_t cur_bytes; /* number of bytes in current iteration */
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uint64_t bytes_done = 0;
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uint8_t *cipher_data = NULL;
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QEMUIOVector hd_qiov;
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int ret = 0;
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uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block);
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uint64_t payload_offset = qcrypto_block_get_payload_offset(crypto->block);
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assert(!flags);
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assert(payload_offset < INT64_MAX);
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assert(QEMU_IS_ALIGNED(offset, sector_size));
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assert(QEMU_IS_ALIGNED(bytes, sector_size));
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qemu_iovec_init(&hd_qiov, qiov->niov);
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/* Bounce buffer because we don't wish to expose cipher text
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* in qiov which points to guest memory.
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*/
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cipher_data =
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qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_IO_SIZE,
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qiov->size));
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if (cipher_data == NULL) {
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ret = -ENOMEM;
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goto cleanup;
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}
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while (bytes) {
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cur_bytes = MIN(bytes, BLOCK_CRYPTO_MAX_IO_SIZE);
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qemu_iovec_reset(&hd_qiov);
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qemu_iovec_add(&hd_qiov, cipher_data, cur_bytes);
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ret = bdrv_co_preadv(bs->file, payload_offset + offset + bytes_done,
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cur_bytes, &hd_qiov, 0);
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if (ret < 0) {
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goto cleanup;
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}
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if (qcrypto_block_decrypt(crypto->block, offset + bytes_done,
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cipher_data, cur_bytes, NULL) < 0) {
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ret = -EIO;
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goto cleanup;
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}
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qemu_iovec_from_buf(qiov, bytes_done, cipher_data, cur_bytes);
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bytes -= cur_bytes;
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bytes_done += cur_bytes;
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}
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cleanup:
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qemu_iovec_destroy(&hd_qiov);
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qemu_vfree(cipher_data);
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return ret;
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}
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static coroutine_fn int
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block_crypto_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
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QEMUIOVector *qiov, int flags)
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{
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BlockCrypto *crypto = bs->opaque;
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uint64_t cur_bytes; /* number of bytes in current iteration */
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uint64_t bytes_done = 0;
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uint8_t *cipher_data = NULL;
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QEMUIOVector hd_qiov;
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int ret = 0;
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uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block);
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uint64_t payload_offset = qcrypto_block_get_payload_offset(crypto->block);
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assert(!(flags & ~BDRV_REQ_FUA));
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assert(payload_offset < INT64_MAX);
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assert(QEMU_IS_ALIGNED(offset, sector_size));
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assert(QEMU_IS_ALIGNED(bytes, sector_size));
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qemu_iovec_init(&hd_qiov, qiov->niov);
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/* Bounce buffer because we're not permitted to touch
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* contents of qiov - it points to guest memory.
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*/
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cipher_data =
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qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_IO_SIZE,
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qiov->size));
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if (cipher_data == NULL) {
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ret = -ENOMEM;
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goto cleanup;
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}
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while (bytes) {
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cur_bytes = MIN(bytes, BLOCK_CRYPTO_MAX_IO_SIZE);
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qemu_iovec_to_buf(qiov, bytes_done, cipher_data, cur_bytes);
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if (qcrypto_block_encrypt(crypto->block, offset + bytes_done,
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cipher_data, cur_bytes, NULL) < 0) {
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ret = -EIO;
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goto cleanup;
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}
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qemu_iovec_reset(&hd_qiov);
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qemu_iovec_add(&hd_qiov, cipher_data, cur_bytes);
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ret = bdrv_co_pwritev(bs->file, payload_offset + offset + bytes_done,
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cur_bytes, &hd_qiov, flags);
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if (ret < 0) {
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goto cleanup;
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}
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bytes -= cur_bytes;
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bytes_done += cur_bytes;
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}
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cleanup:
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qemu_iovec_destroy(&hd_qiov);
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qemu_vfree(cipher_data);
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return ret;
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}
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static void block_crypto_refresh_limits(BlockDriverState *bs, Error **errp)
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{
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BlockCrypto *crypto = bs->opaque;
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uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block);
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bs->bl.request_alignment = sector_size; /* No sub-sector I/O */
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}
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static int64_t block_crypto_getlength(BlockDriverState *bs)
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{
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BlockCrypto *crypto = bs->opaque;
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int64_t len = bdrv_getlength(bs->file->bs);
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uint64_t offset = qcrypto_block_get_payload_offset(crypto->block);
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assert(offset < INT64_MAX);
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if (offset > len) {
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return -EIO;
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}
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len -= offset;
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return len;
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}
|
|
|
|
|
|
static int block_crypto_probe_luks(const uint8_t *buf,
|
|
int buf_size,
|
|
const char *filename) {
|
|
return block_crypto_probe_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS,
|
|
buf, buf_size, filename);
|
|
}
|
|
|
|
static int block_crypto_open_luks(BlockDriverState *bs,
|
|
QDict *options,
|
|
int flags,
|
|
Error **errp)
|
|
{
|
|
return block_crypto_open_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS,
|
|
&block_crypto_runtime_opts_luks,
|
|
bs, options, flags, errp);
|
|
}
|
|
|
|
static int coroutine_fn
|
|
block_crypto_co_create_luks(BlockdevCreateOptions *create_options, Error **errp)
|
|
{
|
|
BlockdevCreateOptionsLUKS *luks_opts;
|
|
BlockDriverState *bs = NULL;
|
|
QCryptoBlockCreateOptions create_opts;
|
|
int ret;
|
|
|
|
assert(create_options->driver == BLOCKDEV_DRIVER_LUKS);
|
|
luks_opts = &create_options->u.luks;
|
|
|
|
bs = bdrv_open_blockdev_ref(luks_opts->file, errp);
|
|
if (bs == NULL) {
|
|
return -EIO;
|
|
}
|
|
|
|
create_opts = (QCryptoBlockCreateOptions) {
|
|
.format = Q_CRYPTO_BLOCK_FORMAT_LUKS,
|
|
.u.luks = *qapi_BlockdevCreateOptionsLUKS_base(luks_opts),
|
|
};
|
|
|
|
ret = block_crypto_co_create_generic(bs, luks_opts->size, &create_opts,
|
|
errp);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
ret = 0;
|
|
fail:
|
|
bdrv_unref(bs);
|
|
return ret;
|
|
}
|
|
|
|
static int coroutine_fn block_crypto_co_create_opts_luks(const char *filename,
|
|
QemuOpts *opts,
|
|
Error **errp)
|
|
{
|
|
QCryptoBlockCreateOptions *create_opts = NULL;
|
|
BlockDriverState *bs = NULL;
|
|
QDict *cryptoopts;
|
|
int64_t size;
|
|
int ret;
|
|
|
|
/* Parse options */
|
|
size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0);
|
|
|
|
cryptoopts = qemu_opts_to_qdict_filtered(opts, NULL,
|
|
&block_crypto_create_opts_luks,
|
|
true);
|
|
|
|
create_opts = block_crypto_create_opts_init(Q_CRYPTO_BLOCK_FORMAT_LUKS,
|
|
cryptoopts, errp);
|
|
if (!create_opts) {
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
/* Create protocol layer */
|
|
ret = bdrv_create_file(filename, opts, errp);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
bs = bdrv_open(filename, NULL, NULL,
|
|
BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp);
|
|
if (!bs) {
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
/* Create format layer */
|
|
ret = block_crypto_co_create_generic(bs, size, create_opts, errp);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
ret = 0;
|
|
fail:
|
|
bdrv_unref(bs);
|
|
qapi_free_QCryptoBlockCreateOptions(create_opts);
|
|
QDECREF(cryptoopts);
|
|
return ret;
|
|
}
|
|
|
|
static int block_crypto_get_info_luks(BlockDriverState *bs,
|
|
BlockDriverInfo *bdi)
|
|
{
|
|
BlockDriverInfo subbdi;
|
|
int ret;
|
|
|
|
ret = bdrv_get_info(bs->file->bs, &subbdi);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
|
|
bdi->unallocated_blocks_are_zero = false;
|
|
bdi->cluster_size = subbdi.cluster_size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ImageInfoSpecific *
|
|
block_crypto_get_specific_info_luks(BlockDriverState *bs)
|
|
{
|
|
BlockCrypto *crypto = bs->opaque;
|
|
ImageInfoSpecific *spec_info;
|
|
QCryptoBlockInfo *info;
|
|
|
|
info = qcrypto_block_get_info(crypto->block, NULL);
|
|
if (!info) {
|
|
return NULL;
|
|
}
|
|
if (info->format != Q_CRYPTO_BLOCK_FORMAT_LUKS) {
|
|
qapi_free_QCryptoBlockInfo(info);
|
|
return NULL;
|
|
}
|
|
|
|
spec_info = g_new(ImageInfoSpecific, 1);
|
|
spec_info->type = IMAGE_INFO_SPECIFIC_KIND_LUKS;
|
|
spec_info->u.luks.data = g_new(QCryptoBlockInfoLUKS, 1);
|
|
*spec_info->u.luks.data = info->u.luks;
|
|
|
|
/* Blank out pointers we've just stolen to avoid double free */
|
|
memset(&info->u.luks, 0, sizeof(info->u.luks));
|
|
|
|
qapi_free_QCryptoBlockInfo(info);
|
|
|
|
return spec_info;
|
|
}
|
|
|
|
BlockDriver bdrv_crypto_luks = {
|
|
.format_name = "luks",
|
|
.instance_size = sizeof(BlockCrypto),
|
|
.bdrv_probe = block_crypto_probe_luks,
|
|
.bdrv_open = block_crypto_open_luks,
|
|
.bdrv_close = block_crypto_close,
|
|
.bdrv_child_perm = bdrv_format_default_perms,
|
|
.bdrv_co_create = block_crypto_co_create_luks,
|
|
.bdrv_co_create_opts = block_crypto_co_create_opts_luks,
|
|
.bdrv_truncate = block_crypto_truncate,
|
|
.create_opts = &block_crypto_create_opts_luks,
|
|
|
|
.bdrv_reopen_prepare = block_crypto_reopen_prepare,
|
|
.bdrv_refresh_limits = block_crypto_refresh_limits,
|
|
.bdrv_co_preadv = block_crypto_co_preadv,
|
|
.bdrv_co_pwritev = block_crypto_co_pwritev,
|
|
.bdrv_getlength = block_crypto_getlength,
|
|
.bdrv_get_info = block_crypto_get_info_luks,
|
|
.bdrv_get_specific_info = block_crypto_get_specific_info_luks,
|
|
};
|
|
|
|
static void block_crypto_init(void)
|
|
{
|
|
bdrv_register(&bdrv_crypto_luks);
|
|
}
|
|
|
|
block_init(block_crypto_init);
|