This converts the qcow driver to make use of the QCryptoBlock
APIs for encrypting image content. This is only wired up to
permit use of the legacy QCow encryption format. Users who wish
to have the strong LUKS format should switch to qcow2 instead.
With this change it is now required to use the QCryptoSecret
object for providing passwords, instead of the current block
password APIs / interactive prompting.
$QEMU \
-object secret,id=sec0,filename=/home/berrange/encrypted.pw \
-drive file=/home/berrange/encrypted.qcow,encrypt.format=qcow,\
encrypt.key-secret=sec0
Likewise when creating images with the legacy AES-CBC format
qemu-img create -f qcow \
-object secret,id=sec0,filename=/home/berrange/encrypted.pw \
-o encrypt.format=aes,encrypt.key-secret=sec0 \
/home/berrange/encrypted.qcow
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---
block/crypto.c | 10 +++
block/crypto.h | 20 ++++--
block/qcow.c | 196 +++++++++++++++++++++++++--------------------------
qapi/block-core.json | 38 +++++++++-
4 files changed, 157 insertions(+), 107 deletions(-)
diff --git a/block/crypto.c b/block/crypto.c
index 9df1e5d..da4be74 100644
--- a/block/crypto.c
+++ b/block/crypto.c
@@ -181,6 +181,11 @@ block_crypto_open_opts_init(QCryptoBlockFormat format,
v, &ret->u.luks, &local_err);
break;
+ case Q_CRYPTO_BLOCK_FORMAT_QCOW:
+ visit_type_QCryptoBlockOptionsQCow_members(
+ v, &ret->u.qcow, &local_err);
+ break;
+
default:
error_setg(&local_err, "Unsupported block format %d", format);
break;
@@ -227,6 +232,11 @@ block_crypto_create_opts_init(QCryptoBlockFormat format,
v, &ret->u.luks, &local_err);
break;
+ case Q_CRYPTO_BLOCK_FORMAT_QCOW:
+ visit_type_QCryptoBlockOptionsQCow_members(
+ v, &ret->u.qcow, &local_err);
+ break;
+
default:
error_setg(&local_err, "Unsupported block format %d", format);
break;
diff --git a/block/crypto.h b/block/crypto.h
index 3430dcd..0f985ea 100644
--- a/block/crypto.h
+++ b/block/crypto.h
@@ -21,6 +21,19 @@
#ifndef BLOCK_CRYPTO_H__
#define BLOCK_CRYPTO_H__
+#define BLOCK_CRYPTO_OPT_DEF_KEY_SECRET(prefix, helpstr) \
+ { \
+ .name = prefix BLOCK_CRYPTO_OPT_QCOW_KEY_SECRET, \
+ .type = QEMU_OPT_STRING, \
+ .help = helpstr, \
+ }
+
+#define BLOCK_CRYPTO_OPT_QCOW_KEY_SECRET "key-secret"
+
+#define BLOCK_CRYPTO_OPT_DEF_QCOW_KEY_SECRET(prefix) \
+ BLOCK_CRYPTO_OPT_DEF_KEY_SECRET(prefix, \
+ "ID of the secret that provides the AES encryption key")
+
#define BLOCK_CRYPTO_OPT_LUKS_KEY_SECRET "key-secret"
#define BLOCK_CRYPTO_OPT_LUKS_CIPHER_ALG "cipher-alg"
#define BLOCK_CRYPTO_OPT_LUKS_CIPHER_MODE "cipher-mode"
@@ -30,11 +43,8 @@
#define BLOCK_CRYPTO_OPT_LUKS_ITER_TIME "iter-time"
#define BLOCK_CRYPTO_OPT_DEF_LUKS_KEY_SECRET(prefix) \
- { \
- .name = prefix BLOCK_CRYPTO_OPT_LUKS_KEY_SECRET, \
- .type = QEMU_OPT_STRING, \
- .help = "ID of the secret that provides the keyslot passphrase", \
- }
+ BLOCK_CRYPTO_OPT_DEF_KEY_SECRET(prefix, \
+ "ID of the secret that provides the keyslot passphrase")
#define BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_ALG(prefix) \
{ \
diff --git a/block/qcow.c b/block/qcow.c
index 90a934c..307a97a 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -31,8 +31,10 @@
#include "qemu/bswap.h"
#include <zlib.h>
#include "qapi/qmp/qerror.h"
-#include "crypto/cipher.h"
+#include "qapi/qmp/qstring.h"
+#include "crypto/block.h"
#include "migration/blocker.h"
+#include "block/crypto.h"
/**************************************************************/
/* QEMU COW block driver with compression and encryption support */
@@ -77,7 +79,7 @@ typedef struct BDRVQcowState {
uint8_t *cluster_cache;
uint8_t *cluster_data;
uint64_t cluster_cache_offset;
- QCryptoCipher *cipher; /* NULL if no key yet */
+ QCryptoBlock *crypto; /* Disk encryption format driver */
uint32_t crypt_method_header;
CoMutex lock;
Error *migration_blocker;
@@ -97,6 +99,15 @@ static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename)
return 0;
}
+static QemuOptsList qcow_runtime_opts = {
+ .name = "qcow",
+ .head = QTAILQ_HEAD_INITIALIZER(qcow_runtime_opts.head),
+ .desc = {
+ BLOCK_CRYPTO_OPT_DEF_QCOW_KEY_SECRET("encrypt."),
+ { /* end of list */ }
+ },
+};
+
static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
@@ -105,6 +116,13 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
int ret;
QCowHeader header;
Error *local_err = NULL;
+ QCryptoBlockOpenOptions *crypto_opts = NULL;
+ unsigned int cflags = 0;
+ QDict *encryptopts = NULL;
+ const char *encryptfmt;
+
+ qdict_extract_subqdict(options, &encryptopts, "encrypt.");
+ encryptfmt = qdict_get_try_str(encryptopts, "format");
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
@@ -155,17 +173,6 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
goto fail;
}
- if (header.crypt_method > QCOW_CRYPT_AES) {
- error_setg(errp, "invalid encryption method in qcow header");
- ret = -EINVAL;
- goto fail;
- }
- if (!qcrypto_cipher_supports(QCRYPTO_CIPHER_ALG_AES_128,
- QCRYPTO_CIPHER_MODE_CBC)) {
- error_setg(errp, "AES cipher not available");
- ret = -EINVAL;
- goto fail;
- }
s->crypt_method_header = header.crypt_method;
if (s->crypt_method_header) {
if (bdrv_uses_whitelist() &&
@@ -181,8 +188,38 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
ret = -ENOSYS;
goto fail;
}
+ if (s->crypt_method_header == QCOW_CRYPT_AES) {
+ if (encryptfmt && !g_str_equal(encryptfmt, "aes")) {
+ error_setg(errp,
+ "Header reported 'aes' encryption format but "
+ "options specify '%s'", encryptfmt);
+ ret = -EINVAL;
+ goto fail;
+ }
+ qdict_del(encryptopts, "format");
+ crypto_opts = block_crypto_open_opts_init(
+ Q_CRYPTO_BLOCK_FORMAT_QCOW, encryptopts, errp);
+ if (!crypto_opts) {
+ ret = -EINVAL;
+ goto fail;
+ }
+ if (flags & BDRV_O_NO_IO) {
+ cflags |= QCRYPTO_BLOCK_OPEN_NO_IO;
+ }
+ s->crypto = qcrypto_block_open(crypto_opts, NULL, NULL,
+ cflags, errp);
+ if (!s->crypto) {
+ ret = -EINVAL;
+ goto fail;
+ }
+ } else {
+ error_setg(errp, "invalid encryption method in qcow header");
+ ret = -EINVAL;
+ goto fail;
+ }
bs->encrypted = true;
+ bs->valid_key = true;
}
s->cluster_bits = header.cluster_bits;
s->cluster_size = 1 << s->cluster_bits;
@@ -266,6 +303,8 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
goto fail;
}
+ QDECREF(encryptopts);
+ qapi_free_QCryptoBlockOpenOptions(crypto_opts);
qemu_co_mutex_init(&s->lock);
return 0;
@@ -274,6 +313,9 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
qemu_vfree(s->l2_cache);
g_free(s->cluster_cache);
g_free(s->cluster_data);
+ qcrypto_block_free(s->crypto);
+ QDECREF(encryptopts);
+ qapi_free_QCryptoBlockOpenOptions(crypto_opts);
return ret;
}
@@ -286,81 +328,6 @@ static int qcow_reopen_prepare(BDRVReopenState *state,
return 0;
}
-static int qcow_set_key(BlockDriverState *bs, const char *key)
-{
- BDRVQcowState *s = bs->opaque;
- uint8_t keybuf[16];
- int len, i;
- Error *err;
-
- memset(keybuf, 0, 16);
- len = strlen(key);
- if (len > 16)
- len = 16;
- /* XXX: we could compress the chars to 7 bits to increase
- entropy */
- for(i = 0;i < len;i++) {
- keybuf[i] = key[i];
- }
- assert(bs->encrypted);
-
- qcrypto_cipher_free(s->cipher);
- s->cipher = qcrypto_cipher_new(
- QCRYPTO_CIPHER_ALG_AES_128,
- QCRYPTO_CIPHER_MODE_CBC,
- keybuf, G_N_ELEMENTS(keybuf),
- &err);
-
- if (!s->cipher) {
- /* XXX would be nice if errors in this method could
- * be properly propagate to the caller. Would need
- * the bdrv_set_key() API signature to be fixed. */
- error_free(err);
- return -1;
- }
- return 0;
-}
-
-/* The crypt function is compatible with the linux cryptoloop
- algorithm for < 4 GB images. */
-static int encrypt_sectors(BDRVQcowState *s, int64_t sector_num,
- uint8_t *buf, int nb_sectors, bool enc,
- Error **errp)
-{
- union {
- uint64_t ll[2];
- uint8_t b[16];
- } ivec;
- int i;
- int ret;
-
- for(i = 0; i < nb_sectors; i++) {
- ivec.ll[0] = cpu_to_le64(sector_num);
- ivec.ll[1] = 0;
- if (qcrypto_cipher_setiv(s->cipher,
- ivec.b, G_N_ELEMENTS(ivec.b),
- errp) < 0) {
- return -1;
- }
- if (enc) {
- ret = qcrypto_cipher_encrypt(s->cipher,
- buf, buf,
- 512,
- errp);
- } else {
- ret = qcrypto_cipher_decrypt(s->cipher,
- buf, buf,
- 512,
- errp);
- }
- if (ret < 0) {
- return -1;
- }
- sector_num++;
- buf += 512;
- }
- return 0;
-}
/* 'allocate' is:
*
@@ -475,15 +442,16 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
if (bs->encrypted &&
(n_end - n_start) < s->cluster_sectors) {
uint64_t start_sect;
- assert(s->cipher);
+ assert(s->crypto);
start_sect = (offset & ~(s->cluster_size - 1)) >> 9;
for(i = 0; i < s->cluster_sectors; i++) {
if (i < n_start || i >= n_end) {
Error *err = NULL;
memset(s->cluster_data, 0x00, 512);
- if (encrypt_sectors(s, start_sect + i,
- s->cluster_data, 1,
- true, &err) < 0) {
+ if (qcrypto_block_encrypt(s->crypto, start_sect + i,
+ s->cluster_data,
+ BDRV_SECTOR_SIZE,
+ &err) < 0) {
error_free(err);
errno = EIO;
return -1;
@@ -528,7 +496,7 @@ static int64_t coroutine_fn qcow_co_get_block_status(BlockDriverState *bs,
if (!cluster_offset) {
return 0;
}
- if ((cluster_offset & QCOW_OFLAG_COMPRESSED) || s->cipher) {
+ if ((cluster_offset & QCOW_OFLAG_COMPRESSED) || s->crypto) {
return BDRV_BLOCK_DATA;
}
cluster_offset |= (index_in_cluster << BDRV_SECTOR_BITS);
@@ -659,9 +627,9 @@ static coroutine_fn int qcow_co_readv(BlockDriverState *bs, int64_t sector_num,
break;
}
if (bs->encrypted) {
- assert(s->cipher);
- if (encrypt_sectors(s, sector_num, buf,
- n, false, &err) < 0) {
+ assert(s->crypto);
+ if (qcrypto_block_decrypt(s->crypto, sector_num, buf,
+ n * BDRV_SECTOR_SIZE, &err) < 0) {
goto fail;
}
}
@@ -734,8 +702,9 @@ static coroutine_fn int qcow_co_writev(BlockDriverState *bs, int64_t sector_num,
}
if (bs->encrypted) {
Error *err = NULL;
- assert(s->cipher);
- if (encrypt_sectors(s, sector_num, buf, n, true, &err) < 0) {
+ assert(s->crypto);
+ if (qcrypto_block_encrypt(s->crypto, sector_num, buf,
+ n * BDRV_SECTOR_SIZE, &err) < 0) {
error_free(err);
ret = -EIO;
break;
@@ -770,8 +739,8 @@ static void qcow_close(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
- qcrypto_cipher_free(s->cipher);
- s->cipher = NULL;
+ qcrypto_block_free(s->crypto);
+ s->crypto = NULL;
g_free(s->l1_table);
qemu_vfree(s->l2_cache);
g_free(s->cluster_cache);
@@ -792,6 +761,10 @@ static int qcow_create(const char *filename, QemuOpts *opts, Error **errp)
int ret;
BlockBackend *qcow_blk;
const char *encryptfmt = NULL;
+ QDict *options;
+ QDict *encryptopts = NULL;
+ QCryptoBlockCreateOptions *crypto_opts = NULL;
+ QCryptoBlock *crypto = NULL;
/* Read out options */
total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
@@ -865,6 +838,10 @@ static int qcow_create(const char *filename, QemuOpts *opts, Error **errp)
l1_size = (total_size + (1LL << shift) - 1) >> shift;
header.l1_table_offset = cpu_to_be64(header_size);
+
+ options = qemu_opts_to_qdict(opts, NULL);
+ qdict_extract_subqdict(options, &encryptopts, "encrypt.");
+ QDECREF(options);
if (encryptfmt) {
if (!g_str_equal(encryptfmt, "aes")) {
error_setg(errp, "Unknown encryption format '%s', expected 'aes'",
@@ -873,6 +850,20 @@ static int qcow_create(const char *filename, QemuOpts *opts, Error **errp)
goto exit;
}
header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES);
+
+ crypto_opts = block_crypto_create_opts_init(
+ Q_CRYPTO_BLOCK_FORMAT_QCOW, encryptopts, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ ret = -EINVAL;
+ goto exit;
+ }
+
+ crypto = qcrypto_block_create(crypto_opts, NULL, NULL, NULL, errp);
+ if (!crypto) {
+ ret = -EINVAL;
+ goto exit;
+ }
} else {
header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE);
}
@@ -907,6 +898,9 @@ static int qcow_create(const char *filename, QemuOpts *opts, Error **errp)
exit:
blk_unref(qcow_blk);
cleanup:
+ QDECREF(encryptopts);
+ qcrypto_block_free(crypto);
+ qapi_free_QCryptoBlockCreateOptions(crypto_opts);
g_free(backing_file);
return ret;
}
@@ -1054,6 +1048,7 @@ static QemuOptsList qcow_create_opts = {
.type = QEMU_OPT_STRING,
.help = "Encrypt the image, format choices: 'aes'",
},
+ BLOCK_CRYPTO_OPT_DEF_QCOW_KEY_SECRET("encrypt."),
{ /* end of list */ }
}
};
@@ -1074,7 +1069,6 @@ static BlockDriver bdrv_qcow = {
.bdrv_co_writev = qcow_co_writev,
.bdrv_co_get_block_status = qcow_co_get_block_status,
- .bdrv_set_key = qcow_set_key,
.bdrv_make_empty = qcow_make_empty,
.bdrv_co_pwritev_compressed = qcow_co_pwritev_compressed,
.bdrv_get_info = qcow_get_info,
diff --git a/qapi/block-core.json b/qapi/block-core.json
index ea0b3e8..65ef79c 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -2281,6 +2281,42 @@
'mode': 'Qcow2OverlapCheckMode' } }
##
+# @BlockdevQcowEncryptionFormat:
+#
+# @aes: AES-CBC with plain64 initialization vectors
+#
+# Since: 2.10
+##
+{ 'enum': 'BlockdevQcowEncryptionFormat',
+ 'data': [ 'aes' ] }
+
+##
+# @BlockdevQcowEncryption:
+#
+# Since: 2.10
+##
+{ 'union': 'BlockdevQcowEncryption',
+ 'base': { 'format': 'BlockdevQcowEncryptionFormat' },
+ 'discriminator': 'format',
+ 'data': { 'aes': 'QCryptoBlockOptionsQCow' } }
+
+##
+# @BlockdevOptionsQcow:
+#
+# Driver specific block device options for qcow.
+#
+# @encrypt: Image decryption options. Mandatory for
+# encrypted images, except when doing a metadata-only
+# probe of the image.
+#
+# Since: 2.10
+##
+{ 'struct': 'BlockdevOptionsQcow',
+ 'base': 'BlockdevOptionsGenericCOWFormat',
+ 'data': { '*encrypt': 'BlockdevQcowEncryption' } }
+
+
+##
# @BlockdevOptionsQcow2:
#
# Driver specific block device options for qcow2.
@@ -2975,7 +3011,7 @@
'null-co': 'BlockdevOptionsNull',
'parallels': 'BlockdevOptionsGenericFormat',
'qcow2': 'BlockdevOptionsQcow2',
- 'qcow': 'BlockdevOptionsGenericCOWFormat',
+ 'qcow': 'BlockdevOptionsQcow',
'qed': 'BlockdevOptionsGenericCOWFormat',
'quorum': 'BlockdevOptionsQuorum',
'raw': 'BlockdevOptionsRaw',
--
2.9.3
On Thu 25 May 2017 06:38:40 PM CEST, Daniel P. Berrange wrote:
> @@ -105,6 +116,13 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
> int ret;
> QCowHeader header;
> Error *local_err = NULL;
> + QCryptoBlockOpenOptions *crypto_opts = NULL;
> + unsigned int cflags = 0;
> + QDict *encryptopts = NULL;
> + const char *encryptfmt;
> +
> + qdict_extract_subqdict(options, &encryptopts, "encrypt.");
> + encryptfmt = qdict_get_try_str(encryptopts, "format");
>
> bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
> false, errp);
> if (!bs->file) {
> return -EINVAL;
> }
You're leaking encryptopts if the function returns here.
> @@ -873,6 +850,20 @@ static int qcow_create(const char *filename, QemuOpts *opts, Error **errp)
> goto exit;
> }
> header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES);
> +
> + crypto_opts = block_crypto_create_opts_init(
> + Q_CRYPTO_BLOCK_FORMAT_QCOW, encryptopts, &local_err);
> + if (local_err) {
> + error_propagate(errp, local_err);
> + ret = -EINVAL;
> + goto exit;
> + }
Not very important, and my fault for not having pointed it out in my
previous review, but you can spare the error_propagate() call if you
pass errp directly to block_crypto_create_opts_init() and then check if
crypto_opts is NULL.
Actually none of the error_propagate() calls in qcow_create() is really
necessary, but that could be fixed in a separate patch, if at all (it's
not so important).
The leak however needs to be fixed. With that,
Reviewed-by: Alberto Garcia <berto@igalia.com>
Berto
On Fri, May 26, 2017 at 02:03:40PM +0200, Alberto Garcia wrote:
> On Thu 25 May 2017 06:38:40 PM CEST, Daniel P. Berrange wrote:
> > @@ -105,6 +116,13 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
> > int ret;
> > QCowHeader header;
> > Error *local_err = NULL;
> > + QCryptoBlockOpenOptions *crypto_opts = NULL;
> > + unsigned int cflags = 0;
> > + QDict *encryptopts = NULL;
> > + const char *encryptfmt;
> > +
> > + qdict_extract_subqdict(options, &encryptopts, "encrypt.");
> > + encryptfmt = qdict_get_try_str(encryptopts, "format");
> >
> > bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
> > false, errp);
> > if (!bs->file) {
> > return -EINVAL;
> > }
>
> You're leaking encryptopts if the function returns here.
>
> > @@ -873,6 +850,20 @@ static int qcow_create(const char *filename, QemuOpts *opts, Error **errp)
> > goto exit;
> > }
> > header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES);
> > +
> > + crypto_opts = block_crypto_create_opts_init(
> > + Q_CRYPTO_BLOCK_FORMAT_QCOW, encryptopts, &local_err);
> > + if (local_err) {
> > + error_propagate(errp, local_err);
> > + ret = -EINVAL;
> > + goto exit;
> > + }
>
> Not very important, and my fault for not having pointed it out in my
> previous review, but you can spare the error_propagate() call if you
> pass errp directly to block_crypto_create_opts_init() and then check if
> crypto_opts is NULL.
>
> Actually none of the error_propagate() calls in qcow_create() is really
> necessary, but that could be fixed in a separate patch, if at all (it's
> not so important).
Since I have to re-post to fix the leak anyway, I'll eliminate the
intermedia local_err usage - I like to avoid that when not needed
anyway.
>
> The leak however needs to be fixed. With that,
>
> Reviewed-by: Alberto Garcia <berto@igalia.com>
Regards,
Daniel
--
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