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block: move encryption deprecation warning into qcow code 

For a couple of releases we have been warning

  Encrypted images are deprecated
  Support for them will be removed in a future release.
  You can use 'qemu-img convert' to convert your image to an unencrypted one.

This warning was issued by system emulators, qemu-img, qemu-nbd
and qemu-io. Such a broad warning was issued because the original
intention was to rip out all the code for dealing with encryption
inside the QEMU block layer APIs.

The new block encryption framework used for the LUKS driver does
not rely on the unloved block layer API for encryption keys,
instead using the QOM 'secret' object type. It is thus no longer
appropriate to warn about encryption unconditionally.

When the qcow/qcow2 drivers are converted to use the new encryption
framework too, it will be practical to keep AES-CBC support present
for use in qemu-img, qemu-io & qemu-nbd to allow for interoperability
with older QEMU versions and liberation of data from existing encrypted
qcow2 files.

This change moves the warning out of the generic block code and
into the qcow/qcow2 drivers. Further, the warning is set to only
appear when running the system emulators, since qemu-img, qemu-io,
qemu-nbd are expected to support qcow2 encryption long term now that
the maint burden has been eliminated.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Daniel P. Berrange 2016-03-21 14:11:48 +00:00 committed by Kevin Wolf
parent 78368575a6
commit e6ff69bf5e
8 changed files with 33 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
block.c
View File

@ -289,6 +289,11 @@ static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only)
return 0;
}
bool bdrv_uses_whitelist(void)
{
return use_bdrv_whitelist;
}
typedef struct CreateCo {
BlockDriver *drv;
char *filename;
@ -1013,13 +1018,6 @@ static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file,
goto free_and_fail;
}
if (bs->encrypted) {
error_report("Encrypted images are deprecated");
error_printf("Support for them will be removed in a future release.\n"
"You can use 'qemu-img convert' to convert your image"
" to an unencrypted one.\n");
}
ret = refresh_total_sectors(bs, bs->total_sectors);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not refresh total sector count");

9
block/qcow.c
View File

@ -24,6 +24,7 @@
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu-common.h"
#include "qemu/error-report.h"
#include "block/block_int.h"
#include "sysemu/block-backend.h"
#include "qemu/module.h"
@ -158,6 +159,14 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
}
s->crypt_method_header = header.crypt_method;
if (s->crypt_method_header) {
if (bdrv_uses_whitelist() &&
s->crypt_method_header == QCOW_CRYPT_AES) {
error_report("qcow built-in AES encryption is deprecated");
error_printf("Support for it will be removed in a future release.\n"
"You can use 'qemu-img convert' to switch to an\n"
"unencrypted qcow image, or a LUKS raw image.\n");
}
bs->encrypted = 1;
}
s->cluster_bits = header.cluster_bits;

8
block/qcow2.c
View File

@ -965,6 +965,14 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
}
s->crypt_method_header = header.crypt_method;
if (s->crypt_method_header) {
if (bdrv_uses_whitelist() &&
s->crypt_method_header == QCOW_CRYPT_AES) {
error_report("qcow2 built-in AES encryption is deprecated");
error_printf("Support for it will be removed in a future release.\n"
"You can use 'qemu-img convert' to switch to an\n"
"unencrypted qcow2 image, or a LUKS raw image.\n");
}
bs->encrypted = 1;
}

1
include/block/block.h
View File

@ -193,6 +193,7 @@ void bdrv_io_limits_update_group(BlockDriverState *bs, const char *group);
void bdrv_init(void);
void bdrv_init_with_whitelist(void);
bool bdrv_uses_whitelist(void);
BlockDriver *bdrv_find_protocol(const char *filename,
bool allow_protocol_prefix,
Error **errp);

6
tests/qemu-iotests/049.out
View File

@ -187,12 +187,6 @@ qemu-img create -f qcow2 -o encryption=off TEST_DIR/t.qcow2 64M
Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 size=67108864 encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16
qemu-img create -f qcow2 -o encryption=on TEST_DIR/t.qcow2 64M
qemu-img: Encrypted images are deprecated
Support for them will be removed in a future release.
You can use 'qemu-img convert' to convert your image to an unencrypted one.
qemu-img: Encrypted images are deprecated
Support for them will be removed in a future release.
You can use 'qemu-img convert' to convert your image to an unencrypted one.
Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 size=67108864 encryption=on cluster_size=65536 lazy_refcounts=off refcount_bits=16
== Check lazy_refcounts option (only with v3) ==

3
tests/qemu-iotests/087
View File

@ -45,7 +45,8 @@ function do_run_qemu()
function run_qemu()
{
do_run_qemu "$@" 2>&1 | _filter_testdir | _filter_qmp | _filter_qemu \
do_run_qemu "$@" 2>&1 | _filter_testdir | _filter_qmp \
| _filter_qemu | _filter_imgfmt \
| sed -e 's/\("actual-size":\s*\)[0-9]\+/\1SIZE/g'
}

26
tests/qemu-iotests/087.out
View File

@ -38,19 +38,14 @@ QMP_VERSION
=== Encrypted image ===
qemu-img: Encrypted images are deprecated
Support for them will be removed in a future release.
You can use 'qemu-img convert' to convert your image to an unencrypted one.
qemu-img: Encrypted images are deprecated
Support for them will be removed in a future release.
You can use 'qemu-img convert' to convert your image to an unencrypted one.
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 encryption=on
Testing: -S
QMP_VERSION
{"return": {}}
Encrypted images are deprecated
Support for them will be removed in a future release.
You can use 'qemu-img convert' to convert your image to an unencrypted one.
IMGFMT built-in AES encryption is deprecated
Support for it will be removed in a future release.
You can use 'qemu-img convert' to switch to an
unencrypted IMGFMT image, or a LUKS raw image.
{"error": {"class": "GenericError", "desc": "blockdev-add doesn't support encrypted devices"}}
{"return": {}}
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "SHUTDOWN"}
@ -58,9 +53,10 @@ You can use 'qemu-img convert' to convert your image to an unencrypted one.
Testing:
QMP_VERSION
{"return": {}}
Encrypted images are deprecated
Support for them will be removed in a future release.
You can use 'qemu-img convert' to convert your image to an unencrypted one.
IMGFMT built-in AES encryption is deprecated
Support for it will be removed in a future release.
You can use 'qemu-img convert' to switch to an
unencrypted IMGFMT image, or a LUKS raw image.
{"error": {"class": "GenericError", "desc": "Guest must be stopped for opening of encrypted image"}}
{"return": {}}
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "SHUTDOWN"}
@ -68,12 +64,6 @@ You can use 'qemu-img convert' to convert your image to an unencrypted one.
=== Missing driver ===
qemu-img: Encrypted images are deprecated
Support for them will be removed in a future release.
You can use 'qemu-img convert' to convert your image to an unencrypted one.
qemu-img: Encrypted images are deprecated
Support for them will be removed in a future release.
You can use 'qemu-img convert' to convert your image to an unencrypted one.
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 encryption=on
Testing: -S
QMP_VERSION

18
tests/qemu-iotests/134.out
View File

@ -1,43 +1,25 @@
QA output created by 134
qemu-img: Encrypted images are deprecated
Support for them will be removed in a future release.
You can use 'qemu-img convert' to convert your image to an unencrypted one.
qemu-img: Encrypted images are deprecated
Support for them will be removed in a future release.
You can use 'qemu-img convert' to convert your image to an unencrypted one.
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 encryption=on
== reading whole image ==
Encrypted images are deprecated
Support for them will be removed in a future release.
You can use 'qemu-img convert' to convert your image to an unencrypted one.
Disk image 'TEST_DIR/t.qcow2' is encrypted.
password:
read 134217728/134217728 bytes at offset 0
128 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
== rewriting whole image ==
Encrypted images are deprecated
Support for them will be removed in a future release.
You can use 'qemu-img convert' to convert your image to an unencrypted one.
Disk image 'TEST_DIR/t.qcow2' is encrypted.
password:
wrote 134217728/134217728 bytes at offset 0
128 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
== verify pattern ==
Encrypted images are deprecated
Support for them will be removed in a future release.
You can use 'qemu-img convert' to convert your image to an unencrypted one.
Disk image 'TEST_DIR/t.qcow2' is encrypted.
password:
read 134217728/134217728 bytes at offset 0
128 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
== verify pattern failure with wrong password ==
Encrypted images are deprecated
Support for them will be removed in a future release.
You can use 'qemu-img convert' to convert your image to an unencrypted one.
Disk image 'TEST_DIR/t.qcow2' is encrypted.
password:
Pattern verification failed at offset 0, 134217728 bytes