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authorJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-05-18 13:18:31 +0300
committerJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-05-18 13:42:15 +0300
commit437fd90c0250dee670290f9b714253671a990160 (patch)
treeb871786c360704244a07411c69fb58da9ead4a06 /qemu/crypto/block-qcow.c
parent5bbd6fe9b8bab2a93e548c5a53b032d1939eec05 (diff)
These changes are the raw update to qemu-2.6.
Collission happened in the following patches: migration: do cleanup operation after completion(738df5b9) Bug fix.(1750c932f86) kvmclock: add a new function to update env->tsc.(b52baab2) The code provided by the patches was already in the upstreamed version. Change-Id: I3cc11841a6a76ae20887b2e245710199e1ea7f9a Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'qemu/crypto/block-qcow.c')
-rw-r--r--qemu/crypto/block-qcow.c174
1 files changed, 174 insertions, 0 deletions
diff --git a/qemu/crypto/block-qcow.c b/qemu/crypto/block-qcow.c
new file mode 100644
index 000000000..be88c6f0e
--- /dev/null
+++ b/qemu/crypto/block-qcow.c
@@ -0,0 +1,174 @@
+/*
+ * QEMU Crypto block device encryption QCow/QCow2 AES-CBC format
+ *
+ * Copyright (c) 2015-2016 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/*
+ * Note that the block encryption implemented in this file is broken
+ * by design. This exists only to allow data to be liberated from
+ * existing qcow[2] images and should not be used in any new areas.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+
+#include "crypto/block-qcow.h"
+#include "crypto/secret.h"
+
+#define QCRYPTO_BLOCK_QCOW_SECTOR_SIZE 512
+
+
+static bool
+qcrypto_block_qcow_has_format(const uint8_t *buf G_GNUC_UNUSED,
+ size_t buf_size G_GNUC_UNUSED)
+{
+ return false;
+}
+
+
+static int
+qcrypto_block_qcow_init(QCryptoBlock *block,
+ const char *keysecret,
+ Error **errp)
+{
+ char *password;
+ int ret;
+ uint8_t keybuf[16];
+ int len;
+
+ memset(keybuf, 0, 16);
+
+ password = qcrypto_secret_lookup_as_utf8(keysecret, errp);
+ if (!password) {
+ return -1;
+ }
+
+ len = strlen(password);
+ memcpy(keybuf, password, MIN(len, sizeof(keybuf)));
+ g_free(password);
+
+ block->niv = qcrypto_cipher_get_iv_len(QCRYPTO_CIPHER_ALG_AES_128,
+ QCRYPTO_CIPHER_MODE_CBC);
+ block->ivgen = qcrypto_ivgen_new(QCRYPTO_IVGEN_ALG_PLAIN64,
+ 0, 0, NULL, 0, errp);
+ if (!block->ivgen) {
+ ret = -ENOTSUP;
+ goto fail;
+ }
+
+ block->cipher = qcrypto_cipher_new(QCRYPTO_CIPHER_ALG_AES_128,
+ QCRYPTO_CIPHER_MODE_CBC,
+ keybuf, G_N_ELEMENTS(keybuf),
+ errp);
+ if (!block->cipher) {
+ ret = -ENOTSUP;
+ goto fail;
+ }
+
+ block->payload_offset = 0;
+
+ return 0;
+
+ fail:
+ qcrypto_cipher_free(block->cipher);
+ qcrypto_ivgen_free(block->ivgen);
+ return ret;
+}
+
+
+static int
+qcrypto_block_qcow_open(QCryptoBlock *block,
+ QCryptoBlockOpenOptions *options,
+ QCryptoBlockReadFunc readfunc G_GNUC_UNUSED,
+ void *opaque G_GNUC_UNUSED,
+ unsigned int flags,
+ Error **errp)
+{
+ if (flags & QCRYPTO_BLOCK_OPEN_NO_IO) {
+ return 0;
+ } else {
+ if (!options->u.qcow.key_secret) {
+ error_setg(errp,
+ "Parameter 'key-secret' is required for cipher");
+ return -1;
+ }
+ return qcrypto_block_qcow_init(block,
+ options->u.qcow.key_secret, errp);
+ }
+}
+
+
+static int
+qcrypto_block_qcow_create(QCryptoBlock *block,
+ QCryptoBlockCreateOptions *options,
+ QCryptoBlockInitFunc initfunc G_GNUC_UNUSED,
+ QCryptoBlockWriteFunc writefunc G_GNUC_UNUSED,
+ void *opaque G_GNUC_UNUSED,
+ Error **errp)
+{
+ if (!options->u.qcow.key_secret) {
+ error_setg(errp, "Parameter 'key-secret' is required for cipher");
+ return -1;
+ }
+ /* QCow2 has no special header, since everything is hardwired */
+ return qcrypto_block_qcow_init(block, options->u.qcow.key_secret, errp);
+}
+
+
+static void
+qcrypto_block_qcow_cleanup(QCryptoBlock *block)
+{
+}
+
+
+static int
+qcrypto_block_qcow_decrypt(QCryptoBlock *block,
+ uint64_t startsector,
+ uint8_t *buf,
+ size_t len,
+ Error **errp)
+{
+ return qcrypto_block_decrypt_helper(block->cipher,
+ block->niv, block->ivgen,
+ QCRYPTO_BLOCK_QCOW_SECTOR_SIZE,
+ startsector, buf, len, errp);
+}
+
+
+static int
+qcrypto_block_qcow_encrypt(QCryptoBlock *block,
+ uint64_t startsector,
+ uint8_t *buf,
+ size_t len,
+ Error **errp)
+{
+ return qcrypto_block_encrypt_helper(block->cipher,
+ block->niv, block->ivgen,
+ QCRYPTO_BLOCK_QCOW_SECTOR_SIZE,
+ startsector, buf, len, errp);
+}
+
+
+const QCryptoBlockDriver qcrypto_block_driver_qcow = {
+ .open = qcrypto_block_qcow_open,
+ .create = qcrypto_block_qcow_create,
+ .cleanup = qcrypto_block_qcow_cleanup,
+ .decrypt = qcrypto_block_qcow_decrypt,
+ .encrypt = qcrypto_block_qcow_encrypt,
+ .has_format = qcrypto_block_qcow_has_format,
+};