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Sun, 24 Dec 2023 21:27:26 -0800 (PST) From: Hyman Huang To: qemu-devel Cc: Kevin Wolf , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , Hanna Reitz , Eric Blake , Markus Armbruster , Hyman Huang Subject: [v3 02/10] crypto: Support generic LUKS encryption Date: Mon, 25 Dec 2023 13:26:52 +0800 Message-Id: X-Mailer: git-send-email 2.39.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=2607:f8b0:4864:20::331; envelope-from=yong.huang@smartx.com; helo=mail-ot1-x331.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @smartx-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1703482260796100012 Content-Type: text/plain; charset="utf-8" By enhancing the LUKS driver, it is possible to enable the detachable LUKS header and, as a result, achieve general encryption for any disk format that QEMU has supported. Take the qcow2 as an example, the usage of the generic LUKS encryption as follows: 1. add a protocol blockdev node of data disk $ virsh qemu-monitor-command vm '{"execute":"blockdev-add", > "arguments":{"node-name":"libvirt-1-storage", "driver":"file", > "filename":"/path/to/test_disk.qcow2"}}' 2. add a protocol blockdev node of LUKS header as above. $ virsh qemu-monitor-command vm '{"execute":"blockdev-add", > "arguments":{"node-name":"libvirt-2-storage", "driver":"file", > "filename": "/path/to/cipher.gluks" }}' 3. add the secret for decrypting the cipher stored in LUKS header above $ virsh qemu-monitor-command vm '{"execute":"object-add", > "arguments":{"qom-type":"secret", "id": > "libvirt-2-storage-secret0", "data":"abc123"}}' 4. add the qcow2-drived blockdev format node $ virsh qemu-monitor-command vm '{"execute":"blockdev-add", > "arguments":{"node-name":"libvirt-1-format", "driver":"qcow2", > "file":"libvirt-1-storage"}}' 5. add the luks-drived blockdev to link the qcow2 disk with LUKS header by specifying the field "header" $ virsh qemu-monitor-command vm '{"execute":"blockdev-add", > "arguments":{"node-name":"libvirt-2-format", "driver":"luks", > "file":"libvirt-1-format", "header":"libvirt-2-storage", > "key-secret":"libvirt-2-format-secret0"}}' 6. add the virtio-blk device finally $ virsh qemu-monitor-command vm '{"execute":"device_add", > "arguments": {"num-queues":"1", "driver":"virtio-blk-pci", > "drive": "libvirt-2-format", "id":"virtio-disk2"}}' The generic LUKS encryption method of starting a virtual machine (VM) is somewhat similar to hot-plug in that both maintaining the same json command while the starting VM changes the "blockdev-add/device_add" parameters to "blockdev/device". Signed-off-by: Hyman Huang Message-Id: <910801f303da1601051479d3b7e5c2c6b4e01eb7.1701879996.git.yong.h= uang@smartx.com> --- block/crypto.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/block/crypto.c b/block/crypto.c index f82b13d32b..6063879bac 100644 --- a/block/crypto.c +++ b/block/crypto.c @@ -64,12 +64,14 @@ static int block_crypto_read_func(QCryptoBlock *block, Error **errp) { BlockDriverState *bs =3D opaque; + BlockCrypto *crypto =3D bs->opaque; ssize_t ret; =20 GLOBAL_STATE_CODE(); GRAPH_RDLOCK_GUARD_MAINLOOP(); =20 - ret =3D bdrv_pread(bs->file, offset, buflen, buf, 0); + ret =3D bdrv_pread(crypto->header ? crypto->header : bs->file, + offset, buflen, buf, 0); if (ret < 0) { error_setg_errno(errp, -ret, "Could not read encryption header"); return ret; @@ -269,6 +271,7 @@ static int block_crypto_open_generic(QCryptoBlockFormat= format, QCryptoBlockOpenOptions *open_opts =3D NULL; unsigned int cflags =3D 0; QDict *cryptoopts =3D NULL; + const char *hdr_bdref =3D qdict_get_try_str(options, "header"); =20 GLOBAL_STATE_CODE(); =20 @@ -277,6 +280,15 @@ static int block_crypto_open_generic(QCryptoBlockForma= t format, return ret; } =20 + if (hdr_bdref) { + crypto->header =3D bdrv_open_child(NULL, options, "header", bs, + &child_of_bds, BDRV_CHILD_METADAT= A, + false, errp); + if (!crypto->header) { + return -EINVAL; + } + } + GRAPH_RDLOCK_GUARD_MAINLOOP(); =20 bs->supported_write_flags =3D BDRV_REQ_FUA & --=20 2.39.1