aboutsummaryrefslogtreecommitdiff
path: root/crypto
diff options
context:
space:
mode:
Diffstat (limited to 'crypto')
-rw-r--r--crypto/Makefile.objs2
-rw-r--r--crypto/block-qcow.c173
-rw-r--r--crypto/block-qcow.h28
-rw-r--r--crypto/block.c258
-rw-r--r--crypto/blockpriv.h92
5 files changed, 553 insertions, 0 deletions
diff --git a/crypto/Makefile.objs b/crypto/Makefile.objs
index e6590dcefb..3ddeb42a35 100644
--- a/crypto/Makefile.objs
+++ b/crypto/Makefile.objs
@@ -19,6 +19,8 @@ crypto-obj-y += ivgen-plain.o
crypto-obj-y += ivgen-plain64.o
crypto-obj-y += afsplit.o
crypto-obj-y += xts.o
+crypto-obj-y += block.o
+crypto-obj-y += block-qcow.o
# Let the userspace emulators avoid linking gnutls/etc
crypto-aes-obj-y = aes.o
diff --git a/crypto/block-qcow.c b/crypto/block-qcow.c
new file mode 100644
index 0000000000..9f378e8635
--- /dev/null
+++ b/crypto/block-qcow.c
@@ -0,0 +1,173 @@
+/*
+ * 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 "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,
+};
diff --git a/crypto/block-qcow.h b/crypto/block-qcow.h
new file mode 100644
index 0000000000..569f836100
--- /dev/null
+++ b/crypto/block-qcow.h
@@ -0,0 +1,28 @@
+/*
+ * 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/>.
+ *
+ */
+
+#ifndef QCRYPTO_BLOCK_QCOW_H__
+#define QCRYPTO_BLOCK_QCOW_H__
+
+#include "crypto/blockpriv.h"
+
+extern const QCryptoBlockDriver qcrypto_block_driver_qcow;
+
+#endif /* QCRYPTO_BLOCK_QCOW_H__ */
diff --git a/crypto/block.c b/crypto/block.c
new file mode 100644
index 0000000000..3c27ef0e8a
--- /dev/null
+++ b/crypto/block.c
@@ -0,0 +1,258 @@
+/*
+ * QEMU Crypto block device encryption
+ *
+ * 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/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "crypto/blockpriv.h"
+#include "crypto/block-qcow.h"
+
+static const QCryptoBlockDriver *qcrypto_block_drivers[] = {
+ [Q_CRYPTO_BLOCK_FORMAT_QCOW] = &qcrypto_block_driver_qcow,
+};
+
+
+bool qcrypto_block_has_format(QCryptoBlockFormat format,
+ const uint8_t *buf,
+ size_t len)
+{
+ const QCryptoBlockDriver *driver;
+
+ if (format >= G_N_ELEMENTS(qcrypto_block_drivers) ||
+ !qcrypto_block_drivers[format]) {
+ return false;
+ }
+
+ driver = qcrypto_block_drivers[format];
+
+ return driver->has_format(buf, len);
+}
+
+
+QCryptoBlock *qcrypto_block_open(QCryptoBlockOpenOptions *options,
+ QCryptoBlockReadFunc readfunc,
+ void *opaque,
+ unsigned int flags,
+ Error **errp)
+{
+ QCryptoBlock *block = g_new0(QCryptoBlock, 1);
+
+ block->format = options->format;
+
+ if (options->format >= G_N_ELEMENTS(qcrypto_block_drivers) ||
+ !qcrypto_block_drivers[options->format]) {
+ error_setg(errp, "Unsupported block driver %d", options->format);
+ g_free(block);
+ return NULL;
+ }
+
+ block->driver = qcrypto_block_drivers[options->format];
+
+ if (block->driver->open(block, options,
+ readfunc, opaque, flags, errp) < 0) {
+ g_free(block);
+ return NULL;
+ }
+
+ return block;
+}
+
+
+QCryptoBlock *qcrypto_block_create(QCryptoBlockCreateOptions *options,
+ QCryptoBlockInitFunc initfunc,
+ QCryptoBlockWriteFunc writefunc,
+ void *opaque,
+ Error **errp)
+{
+ QCryptoBlock *block = g_new0(QCryptoBlock, 1);
+
+ block->format = options->format;
+
+ if (options->format >= G_N_ELEMENTS(qcrypto_block_drivers) ||
+ !qcrypto_block_drivers[options->format]) {
+ error_setg(errp, "Unsupported block driver %d", options->format);
+ g_free(block);
+ return NULL;
+ }
+
+ block->driver = qcrypto_block_drivers[options->format];
+
+ if (block->driver->create(block, options, initfunc,
+ writefunc, opaque, errp) < 0) {
+ g_free(block);
+ return NULL;
+ }
+
+ return block;
+}
+
+
+int qcrypto_block_decrypt(QCryptoBlock *block,
+ uint64_t startsector,
+ uint8_t *buf,
+ size_t len,
+ Error **errp)
+{
+ return block->driver->decrypt(block, startsector, buf, len, errp);
+}
+
+
+int qcrypto_block_encrypt(QCryptoBlock *block,
+ uint64_t startsector,
+ uint8_t *buf,
+ size_t len,
+ Error **errp)
+{
+ return block->driver->encrypt(block, startsector, buf, len, errp);
+}
+
+
+QCryptoCipher *qcrypto_block_get_cipher(QCryptoBlock *block)
+{
+ return block->cipher;
+}
+
+
+QCryptoIVGen *qcrypto_block_get_ivgen(QCryptoBlock *block)
+{
+ return block->ivgen;
+}
+
+
+QCryptoHashAlgorithm qcrypto_block_get_kdf_hash(QCryptoBlock *block)
+{
+ return block->kdfhash;
+}
+
+
+uint64_t qcrypto_block_get_payload_offset(QCryptoBlock *block)
+{
+ return block->payload_offset;
+}
+
+
+void qcrypto_block_free(QCryptoBlock *block)
+{
+ if (!block) {
+ return;
+ }
+
+ block->driver->cleanup(block);
+
+ qcrypto_cipher_free(block->cipher);
+ qcrypto_ivgen_free(block->ivgen);
+ g_free(block);
+}
+
+
+int qcrypto_block_decrypt_helper(QCryptoCipher *cipher,
+ size_t niv,
+ QCryptoIVGen *ivgen,
+ int sectorsize,
+ uint64_t startsector,
+ uint8_t *buf,
+ size_t len,
+ Error **errp)
+{
+ uint8_t *iv;
+ int ret = -1;
+
+ iv = niv ? g_new0(uint8_t, niv) : NULL;
+
+ while (len > 0) {
+ size_t nbytes;
+ if (niv) {
+ if (qcrypto_ivgen_calculate(ivgen,
+ startsector,
+ iv, niv,
+ errp) < 0) {
+ goto cleanup;
+ }
+
+ if (qcrypto_cipher_setiv(cipher,
+ iv, niv,
+ errp) < 0) {
+ goto cleanup;
+ }
+ }
+
+ nbytes = len > sectorsize ? sectorsize : len;
+ if (qcrypto_cipher_decrypt(cipher, buf, buf,
+ nbytes, errp) < 0) {
+ goto cleanup;
+ }
+
+ startsector++;
+ buf += nbytes;
+ len -= nbytes;
+ }
+
+ ret = 0;
+ cleanup:
+ g_free(iv);
+ return ret;
+}
+
+
+int qcrypto_block_encrypt_helper(QCryptoCipher *cipher,
+ size_t niv,
+ QCryptoIVGen *ivgen,
+ int sectorsize,
+ uint64_t startsector,
+ uint8_t *buf,
+ size_t len,
+ Error **errp)
+{
+ uint8_t *iv;
+ int ret = -1;
+
+ iv = niv ? g_new0(uint8_t, niv) : NULL;
+
+ while (len > 0) {
+ size_t nbytes;
+ if (niv) {
+ if (qcrypto_ivgen_calculate(ivgen,
+ startsector,
+ iv, niv,
+ errp) < 0) {
+ goto cleanup;
+ }
+
+ if (qcrypto_cipher_setiv(cipher,
+ iv, niv,
+ errp) < 0) {
+ goto cleanup;
+ }
+ }
+
+ nbytes = len > sectorsize ? sectorsize : len;
+ if (qcrypto_cipher_encrypt(cipher, buf, buf,
+ nbytes, errp) < 0) {
+ goto cleanup;
+ }
+
+ startsector++;
+ buf += nbytes;
+ len -= nbytes;
+ }
+
+ ret = 0;
+ cleanup:
+ g_free(iv);
+ return ret;
+}
diff --git a/crypto/blockpriv.h b/crypto/blockpriv.h
new file mode 100644
index 0000000000..62970859d0
--- /dev/null
+++ b/crypto/blockpriv.h
@@ -0,0 +1,92 @@
+/*
+ * QEMU Crypto block device encryption
+ *
+ * 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/>.
+ *
+ */
+
+#ifndef QCRYPTO_BLOCK_PRIV_H__
+#define QCRYPTO_BLOCK_PRIV_H__
+
+#include "crypto/block.h"
+
+typedef struct QCryptoBlockDriver QCryptoBlockDriver;
+
+struct QCryptoBlock {
+ QCryptoBlockFormat format;
+
+ const QCryptoBlockDriver *driver;
+ void *opaque;
+
+ QCryptoCipher *cipher;
+ QCryptoIVGen *ivgen;
+ QCryptoHashAlgorithm kdfhash;
+ size_t niv;
+ uint64_t payload_offset; /* In bytes */
+};
+
+struct QCryptoBlockDriver {
+ int (*open)(QCryptoBlock *block,
+ QCryptoBlockOpenOptions *options,
+ QCryptoBlockReadFunc readfunc,
+ void *opaque,
+ unsigned int flags,
+ Error **errp);
+
+ int (*create)(QCryptoBlock *block,
+ QCryptoBlockCreateOptions *options,
+ QCryptoBlockInitFunc initfunc,
+ QCryptoBlockWriteFunc writefunc,
+ void *opaque,
+ Error **errp);
+
+ void (*cleanup)(QCryptoBlock *block);
+
+ int (*encrypt)(QCryptoBlock *block,
+ uint64_t startsector,
+ uint8_t *buf,
+ size_t len,
+ Error **errp);
+ int (*decrypt)(QCryptoBlock *block,
+ uint64_t startsector,
+ uint8_t *buf,
+ size_t len,
+ Error **errp);
+
+ bool (*has_format)(const uint8_t *buf,
+ size_t buflen);
+};
+
+
+int qcrypto_block_decrypt_helper(QCryptoCipher *cipher,
+ size_t niv,
+ QCryptoIVGen *ivgen,
+ int sectorsize,
+ uint64_t startsector,
+ uint8_t *buf,
+ size_t len,
+ Error **errp);
+
+int qcrypto_block_encrypt_helper(QCryptoCipher *cipher,
+ size_t niv,
+ QCryptoIVGen *ivgen,
+ int sectorsize,
+ uint64_t startsector,
+ uint8_t *buf,
+ size_t len,
+ Error **errp);
+
+#endif /* QCRYPTO_BLOCK_PRIV_H__ */