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Mon, 29 Jan 2024 21:37:42 -0800 (PST) From: yong.huang@smartx.com To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , Eric Blake , Markus Armbruster , Hanna Reitz , Kevin Wolf , yong.huang@smartx.com Subject: [PATCH v4 5/7] block: Support detached LUKS header creation using qemu-img Date: Tue, 30 Jan 2024 13:37:23 +0800 Message-Id: X-Mailer: git-send-email 2.31.1 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+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=2607:f8b0:4864:20::1134; envelope-from=yong.huang@smartx.com; helo=mail-yw1-x1134.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+importer2=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer2=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @smartx-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1706593249285100004 Content-Type: text/plain; charset="utf-8" From: Hyman Huang Even though a LUKS header might be created with cryptsetup, qemu-img should be enhanced to accommodate it as well. Add the 'detached-header' option to specify the creation of a detached LUKS header. This is how it is used: $ qemu-img create --object secret,id=3Dsec0,data=3Dabc123 -f luks > -o cipher-alg=3Daes-256,cipher-mode=3Dxts -o key-secret=3Dsec0 > -o detached-header=3Dtrue header.luks Using qemu-img or cryptsetup tools to query information of an LUKS header image as follows: Assume a detached LUKS header image has been created by: $ dd if=3D/dev/zero of=3Dtest-header.img bs=3D1M count=3D32 $ dd if=3D/dev/zero of=3Dtest-payload.img bs=3D1M count=3D1000 $ cryptsetup luksFormat --header test-header.img test-payload.img > --force-password --type luks1 Header image information could be queried using cryptsetup: $ cryptsetup luksDump test-header.img or qemu-img: $ qemu-img info 'json:{"driver":"luks","file":{"filename": > "test-payload.img"},"header":{"filename":"test-header.img"}}' When using qemu-img, keep in mind that the entire disk information specified by the JSON-format string above must be supplied on the commandline; if not, an overlay check will reveal a problem with the LUKS volume check logic. Signed-off-by: Hyman Huang Reviewed-by: Daniel P. Berrang=C3=A9 --- block.c | 5 ++++- block/crypto.c | 10 +++++++++- block/crypto.h | 8 ++++++++ qapi/crypto.json | 5 ++++- 4 files changed, 25 insertions(+), 3 deletions(-) diff --git a/block.c b/block.c index 30afdcbba6..1ed9214f66 100644 --- a/block.c +++ b/block.c @@ -7357,7 +7357,10 @@ void bdrv_img_create(const char *filename, const cha= r *fmt, goto out; } =20 - if (size =3D=3D -1) { + /* Parameter 'size' is not needed for detached LUKS header */ + if (size =3D=3D -1 && + !(!strcmp(fmt, "luks") && + qemu_opt_get_bool(opts, "detached-header", false))) { error_setg(errp, "Image creation needs a size parameter"); goto out; } diff --git a/block/crypto.c b/block/crypto.c index 8e7ee5e9ac..65426d3a16 100644 --- a/block/crypto.c +++ b/block/crypto.c @@ -231,6 +231,7 @@ static QemuOptsList block_crypto_create_opts_luks =3D { BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_HASH_ALG(""), BLOCK_CRYPTO_OPT_DEF_LUKS_HASH_ALG(""), BLOCK_CRYPTO_OPT_DEF_LUKS_ITER_TIME(""), + BLOCK_CRYPTO_OPT_DEF_LUKS_DETACHED_HEADER(""), { /* end of list */ } }, }; @@ -405,7 +406,7 @@ block_crypto_co_create_generic(BlockDriverState *bs, in= t64_t size, =20 data =3D (struct BlockCryptoCreateData) { .blk =3D blk, - .size =3D size, + .size =3D flags & QCRYPTO_BLOCK_CREATE_DETACHED ? 0 : size, .prealloc =3D prealloc, }; =20 @@ -791,6 +792,9 @@ block_crypto_co_create_opts_luks(BlockDriver *drv, cons= t char *filename, PreallocMode prealloc; char *buf =3D NULL; int64_t size; + bool detached_hdr =3D + qemu_opt_get_bool(opts, "detached-header", false); + unsigned int cflags =3D 0; int ret; Error *local_err =3D NULL; =20 @@ -830,6 +834,10 @@ block_crypto_co_create_opts_luks(BlockDriver *drv, con= st char *filename, goto fail; } =20 + if (detached_hdr) { + cflags |=3D QCRYPTO_BLOCK_CREATE_DETACHED; + } + /* Create format layer */ ret =3D block_crypto_co_create_generic(bs, size, create_opts, prealloc, 0, errp); diff --git a/block/crypto.h b/block/crypto.h index 72e792c9af..dc3d2d5ed9 100644 --- a/block/crypto.h +++ b/block/crypto.h @@ -41,6 +41,7 @@ #define BLOCK_CRYPTO_OPT_LUKS_IVGEN_HASH_ALG "ivgen-hash-alg" #define BLOCK_CRYPTO_OPT_LUKS_HASH_ALG "hash-alg" #define BLOCK_CRYPTO_OPT_LUKS_ITER_TIME "iter-time" +#define BLOCK_CRYPTO_OPT_LUKS_DETACHED_HEADER "detached-header" #define BLOCK_CRYPTO_OPT_LUKS_KEYSLOT "keyslot" #define BLOCK_CRYPTO_OPT_LUKS_STATE "state" #define BLOCK_CRYPTO_OPT_LUKS_OLD_SECRET "old-secret" @@ -100,6 +101,13 @@ .help =3D "Select new state of affected keyslots (active/inactive)= ",\ } =20 +#define BLOCK_CRYPTO_OPT_DEF_LUKS_DETACHED_HEADER(prefix) \ + { \ + .name =3D prefix BLOCK_CRYPTO_OPT_LUKS_DETACHED_HEADER, \ + .type =3D QEMU_OPT_BOOL, \ + .help =3D "Create a detached LUKS header", \ + } + #define BLOCK_CRYPTO_OPT_DEF_LUKS_KEYSLOT(prefix) \ { \ .name =3D prefix BLOCK_CRYPTO_OPT_LUKS_KEYSLOT, \ diff --git a/qapi/crypto.json b/qapi/crypto.json index fd3d46ebd1..62fd145223 100644 --- a/qapi/crypto.json +++ b/qapi/crypto.json @@ -223,6 +223,8 @@ # @iter-time: number of milliseconds to spend in PBKDF passphrase # processing. Currently defaults to 2000. (since 2.8) # +# @detached-header: create a detached LUKS header. (since 9.0) +# # Since: 2.6 ## { 'struct': 'QCryptoBlockCreateOptionsLUKS', @@ -232,7 +234,8 @@ '*ivgen-alg': 'QCryptoIVGenAlgorithm', '*ivgen-hash-alg': 'QCryptoHashAlgorithm', '*hash-alg': 'QCryptoHashAlgorithm', - '*iter-time': 'int'}} + '*iter-time': 'int', + '*detached-header': 'bool'}} =20 ## # @QCryptoBlockOpenOptions: --=20 2.31.1