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block: remove all encryption handling APIs

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Now that all encryption keys must be provided upfront via
the QCryptoSecret API and associated block driver properties
there is no need for any explicit encryption handling APIs
in the block layer. Encryption can be handled transparently
within the block driver. We only retain an API for querying
whether an image is encrypted or not, since that is a
potentially useful piece of metadata to report to the user.

Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 20170623162419.26068-18-berrange@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Daniel P. Berrange 2017-06-23 17:24:16 +01:00 • committed by Max Reitz
parent 788cf9f8c8
commit c01c214b69
12 changed files with 16 additions and 159 deletions
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77
block.c
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@ -2573,15 +2573,7 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
goto close_and_fail;
}
if (!bdrv_key_required(bs)) {
bdrv_parent_cb_change_media(bs, true);
} else if (!runstate_check(RUN_STATE_PRELAUNCH)
&& !runstate_check(RUN_STATE_INMIGRATE)
&& !runstate_check(RUN_STATE_PAUSED)) { /* HACK */
error_setg(errp,
"Guest must be stopped for opening of encrypted image");
goto close_and_fail;
}
bdrv_parent_cb_change_media(bs, true);
QDECREF(options);
@ -3072,7 +3064,6 @@ static void bdrv_close(BlockDriverState *bs)
bs->backing_format[0] = '\0';
bs->total_sectors = 0;
bs->encrypted = false;
bs->valid_key = false;
bs->sg = false;
QDECREF(bs->options);
QDECREF(bs->explicit_options);
@ -3502,72 +3493,6 @@ bool bdrv_is_encrypted(BlockDriverState *bs)
return bs->encrypted;
}
bool bdrv_key_required(BlockDriverState *bs)
{
BdrvChild *backing = bs->backing;
if (backing && backing->bs->encrypted && !backing->bs->valid_key) {
return true;
}
return (bs->encrypted && !bs->valid_key);
}
int bdrv_set_key(BlockDriverState *bs, const char *key)
{
int ret;
if (bs->backing && bs->backing->bs->encrypted) {
ret = bdrv_set_key(bs->backing->bs, key);
if (ret < 0)
return ret;
if (!bs->encrypted)
return 0;
}
if (!bs->encrypted) {
return -EINVAL;
} else if (!bs->drv || !bs->drv->bdrv_set_key) {
return -ENOMEDIUM;
}
ret = bs->drv->bdrv_set_key(bs, key);
if (ret < 0) {
bs->valid_key = false;
} else if (!bs->valid_key) {
/* call the change callback now, we skipped it on open */
bs->valid_key = true;
bdrv_parent_cb_change_media(bs, true);
}
return ret;
}
/*
* Provide an encryption key for @bs.
* If @key is non-null:
* If @bs is not encrypted, fail.
* Else if the key is invalid, fail.
* Else set @bs's key to @key, replacing the existing key, if any.
* If @key is null:
* If @bs is encrypted and still lacks a key, fail.
* Else do nothing.
* On failure, store an error object through @errp if non-null.
*/
void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp)
{
if (key) {
if (!bdrv_is_encrypted(bs)) {
error_setg(errp, "Node '%s' is not encrypted",
bdrv_get_device_or_node_name(bs));
} else if (bdrv_set_key(bs, key) < 0) {
error_setg(errp, QERR_INVALID_PASSWORD);
}
} else {
if (bdrv_key_required(bs)) {
error_set(errp, ERROR_CLASS_DEVICE_ENCRYPTED,
"'%s' (%s) is encrypted",
bdrv_get_device_or_node_name(bs),
bdrv_get_encrypted_filename(bs));
}
}
}
const char *bdrv_get_format_name(BlockDriverState *bs)
{
return bs->drv ? bs->drv->format_name : NULL;