]>
Commit | Line | Data |
---|---|---|
78368575 DB |
1 | /* |
2 | * QEMU block full disk encryption | |
3 | * | |
4 | * Copyright (c) 2015-2016 Red Hat, Inc. | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include "qemu/osdep.h" | |
22 | ||
23 | #include "block/block_int.h" | |
f853465a | 24 | #include "block/qdict.h" |
78368575 DB |
25 | #include "sysemu/block-backend.h" |
26 | #include "crypto/block.h" | |
27 | #include "qapi/opts-visitor.h" | |
9af23989 | 28 | #include "qapi/qapi-visit-crypto.h" |
306a06e5 | 29 | #include "qapi/qobject-input-visitor.h" |
78368575 | 30 | #include "qapi/error.h" |
922a01a0 | 31 | #include "qemu/option.h" |
0d8c41da | 32 | #include "crypto.h" |
78368575 DB |
33 | |
34 | typedef struct BlockCrypto BlockCrypto; | |
35 | ||
36 | struct BlockCrypto { | |
37 | QCryptoBlock *block; | |
38 | }; | |
39 | ||
40 | ||
41 | static int block_crypto_probe_generic(QCryptoBlockFormat format, | |
42 | const uint8_t *buf, | |
43 | int buf_size, | |
44 | const char *filename) | |
45 | { | |
46 | if (qcrypto_block_has_format(format, buf, buf_size)) { | |
47 | return 100; | |
48 | } else { | |
49 | return 0; | |
50 | } | |
51 | } | |
52 | ||
53 | ||
54 | static ssize_t block_crypto_read_func(QCryptoBlock *block, | |
55 | size_t offset, | |
56 | uint8_t *buf, | |
57 | size_t buflen, | |
e4a3507e | 58 | void *opaque, |
37509233 | 59 | Error **errp) |
78368575 DB |
60 | { |
61 | BlockDriverState *bs = opaque; | |
62 | ssize_t ret; | |
63 | ||
cf2ab8fc | 64 | ret = bdrv_pread(bs->file, offset, buf, buflen); |
78368575 DB |
65 | if (ret < 0) { |
66 | error_setg_errno(errp, -ret, "Could not read encryption header"); | |
67 | return ret; | |
68 | } | |
69 | return ret; | |
70 | } | |
71 | ||
72 | ||
73 | struct BlockCryptoCreateData { | |
78368575 DB |
74 | BlockBackend *blk; |
75 | uint64_t size; | |
76 | }; | |
77 | ||
78 | ||
79 | static ssize_t block_crypto_write_func(QCryptoBlock *block, | |
80 | size_t offset, | |
81 | const uint8_t *buf, | |
82 | size_t buflen, | |
e4a3507e | 83 | void *opaque, |
37509233 | 84 | Error **errp) |
78368575 DB |
85 | { |
86 | struct BlockCryptoCreateData *data = opaque; | |
87 | ssize_t ret; | |
88 | ||
8341f00d | 89 | ret = blk_pwrite(data->blk, offset, buf, buflen, 0); |
78368575 DB |
90 | if (ret < 0) { |
91 | error_setg_errno(errp, -ret, "Could not write encryption header"); | |
92 | return ret; | |
93 | } | |
94 | return ret; | |
95 | } | |
96 | ||
97 | ||
98 | static ssize_t block_crypto_init_func(QCryptoBlock *block, | |
99 | size_t headerlen, | |
e4a3507e | 100 | void *opaque, |
37509233 | 101 | Error **errp) |
78368575 DB |
102 | { |
103 | struct BlockCryptoCreateData *data = opaque; | |
78368575 | 104 | |
3d7ed9c4 KW |
105 | if (data->size > INT64_MAX || headerlen > INT64_MAX - data->size) { |
106 | error_setg(errp, "The requested file size is too large"); | |
107 | return -EFBIG; | |
108 | } | |
109 | ||
78368575 DB |
110 | /* User provided size should reflect amount of space made |
111 | * available to the guest, so we must take account of that | |
112 | * which will be used by the crypto header | |
113 | */ | |
3b5a1f6a KW |
114 | return blk_truncate(data->blk, data->size + headerlen, PREALLOC_MODE_OFF, |
115 | errp); | |
78368575 DB |
116 | } |
117 | ||
118 | ||
119 | static QemuOptsList block_crypto_runtime_opts_luks = { | |
120 | .name = "crypto", | |
121 | .head = QTAILQ_HEAD_INITIALIZER(block_crypto_runtime_opts_luks.head), | |
122 | .desc = { | |
4a47f854 | 123 | BLOCK_CRYPTO_OPT_DEF_LUKS_KEY_SECRET(""), |
78368575 DB |
124 | { /* end of list */ } |
125 | }, | |
126 | }; | |
127 | ||
128 | ||
129 | static QemuOptsList block_crypto_create_opts_luks = { | |
130 | .name = "crypto", | |
131 | .head = QTAILQ_HEAD_INITIALIZER(block_crypto_create_opts_luks.head), | |
132 | .desc = { | |
133 | { | |
134 | .name = BLOCK_OPT_SIZE, | |
135 | .type = QEMU_OPT_SIZE, | |
136 | .help = "Virtual disk size" | |
137 | }, | |
4a47f854 DB |
138 | BLOCK_CRYPTO_OPT_DEF_LUKS_KEY_SECRET(""), |
139 | BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_ALG(""), | |
140 | BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_MODE(""), | |
141 | BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_ALG(""), | |
142 | BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_HASH_ALG(""), | |
143 | BLOCK_CRYPTO_OPT_DEF_LUKS_HASH_ALG(""), | |
144 | BLOCK_CRYPTO_OPT_DEF_LUKS_ITER_TIME(""), | |
78368575 DB |
145 | { /* end of list */ } |
146 | }, | |
147 | }; | |
148 | ||
149 | ||
306a06e5 | 150 | QCryptoBlockOpenOptions * |
78368575 | 151 | block_crypto_open_opts_init(QCryptoBlockFormat format, |
306a06e5 | 152 | QDict *opts, |
78368575 DB |
153 | Error **errp) |
154 | { | |
09204eac | 155 | Visitor *v; |
78368575 DB |
156 | QCryptoBlockOpenOptions *ret = NULL; |
157 | Error *local_err = NULL; | |
158 | ||
159 | ret = g_new0(QCryptoBlockOpenOptions, 1); | |
160 | ret->format = format; | |
161 | ||
f853465a | 162 | v = qobject_input_visitor_new_flat_confused(opts, &local_err); |
e6af90f3 | 163 | if (!v) { |
f853465a MA |
164 | goto out; |
165 | } | |
78368575 | 166 | |
09204eac | 167 | visit_start_struct(v, NULL, NULL, 0, &local_err); |
78368575 DB |
168 | if (local_err) { |
169 | goto out; | |
170 | } | |
171 | ||
172 | switch (format) { | |
173 | case Q_CRYPTO_BLOCK_FORMAT_LUKS: | |
174 | visit_type_QCryptoBlockOptionsLUKS_members( | |
09204eac | 175 | v, &ret->u.luks, &local_err); |
78368575 DB |
176 | break; |
177 | ||
d85f4222 DB |
178 | case Q_CRYPTO_BLOCK_FORMAT_QCOW: |
179 | visit_type_QCryptoBlockOptionsQCow_members( | |
180 | v, &ret->u.qcow, &local_err); | |
181 | break; | |
182 | ||
78368575 DB |
183 | default: |
184 | error_setg(&local_err, "Unsupported block format %d", format); | |
185 | break; | |
186 | } | |
15c2f669 | 187 | if (!local_err) { |
09204eac | 188 | visit_check_struct(v, &local_err); |
15c2f669 | 189 | } |
78368575 | 190 | |
09204eac | 191 | visit_end_struct(v, NULL); |
78368575 DB |
192 | |
193 | out: | |
194 | if (local_err) { | |
195 | error_propagate(errp, local_err); | |
196 | qapi_free_QCryptoBlockOpenOptions(ret); | |
197 | ret = NULL; | |
198 | } | |
09204eac | 199 | visit_free(v); |
78368575 DB |
200 | return ret; |
201 | } | |
202 | ||
203 | ||
306a06e5 | 204 | QCryptoBlockCreateOptions * |
78368575 | 205 | block_crypto_create_opts_init(QCryptoBlockFormat format, |
306a06e5 | 206 | QDict *opts, |
78368575 DB |
207 | Error **errp) |
208 | { | |
09204eac | 209 | Visitor *v; |
78368575 DB |
210 | QCryptoBlockCreateOptions *ret = NULL; |
211 | Error *local_err = NULL; | |
212 | ||
213 | ret = g_new0(QCryptoBlockCreateOptions, 1); | |
214 | ret->format = format; | |
215 | ||
f853465a | 216 | v = qobject_input_visitor_new_flat_confused(opts, &local_err); |
e6af90f3 | 217 | if (!v) { |
f853465a MA |
218 | goto out; |
219 | } | |
78368575 | 220 | |
09204eac | 221 | visit_start_struct(v, NULL, NULL, 0, &local_err); |
78368575 DB |
222 | if (local_err) { |
223 | goto out; | |
224 | } | |
225 | ||
226 | switch (format) { | |
227 | case Q_CRYPTO_BLOCK_FORMAT_LUKS: | |
228 | visit_type_QCryptoBlockCreateOptionsLUKS_members( | |
09204eac | 229 | v, &ret->u.luks, &local_err); |
78368575 DB |
230 | break; |
231 | ||
d85f4222 DB |
232 | case Q_CRYPTO_BLOCK_FORMAT_QCOW: |
233 | visit_type_QCryptoBlockOptionsQCow_members( | |
234 | v, &ret->u.qcow, &local_err); | |
235 | break; | |
236 | ||
78368575 DB |
237 | default: |
238 | error_setg(&local_err, "Unsupported block format %d", format); | |
239 | break; | |
240 | } | |
15c2f669 | 241 | if (!local_err) { |
09204eac | 242 | visit_check_struct(v, &local_err); |
15c2f669 | 243 | } |
78368575 | 244 | |
09204eac | 245 | visit_end_struct(v, NULL); |
78368575 DB |
246 | |
247 | out: | |
248 | if (local_err) { | |
249 | error_propagate(errp, local_err); | |
250 | qapi_free_QCryptoBlockCreateOptions(ret); | |
251 | ret = NULL; | |
252 | } | |
09204eac | 253 | visit_free(v); |
78368575 DB |
254 | return ret; |
255 | } | |
256 | ||
257 | ||
258 | static int block_crypto_open_generic(QCryptoBlockFormat format, | |
259 | QemuOptsList *opts_spec, | |
260 | BlockDriverState *bs, | |
261 | QDict *options, | |
262 | int flags, | |
263 | Error **errp) | |
264 | { | |
265 | BlockCrypto *crypto = bs->opaque; | |
266 | QemuOpts *opts = NULL; | |
267 | Error *local_err = NULL; | |
268 | int ret = -EINVAL; | |
269 | QCryptoBlockOpenOptions *open_opts = NULL; | |
270 | unsigned int cflags = 0; | |
306a06e5 | 271 | QDict *cryptoopts = NULL; |
78368575 | 272 | |
4e4bf5c4 KW |
273 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, |
274 | false, errp); | |
275 | if (!bs->file) { | |
276 | return -EINVAL; | |
277 | } | |
278 | ||
d67a6b09 DB |
279 | bs->supported_write_flags = BDRV_REQ_FUA & |
280 | bs->file->bs->supported_write_flags; | |
281 | ||
78368575 DB |
282 | opts = qemu_opts_create(opts_spec, NULL, 0, &error_abort); |
283 | qemu_opts_absorb_qdict(opts, options, &local_err); | |
284 | if (local_err) { | |
285 | error_propagate(errp, local_err); | |
286 | goto cleanup; | |
287 | } | |
288 | ||
306a06e5 DB |
289 | cryptoopts = qemu_opts_to_qdict(opts, NULL); |
290 | ||
291 | open_opts = block_crypto_open_opts_init(format, cryptoopts, errp); | |
78368575 DB |
292 | if (!open_opts) { |
293 | goto cleanup; | |
294 | } | |
295 | ||
296 | if (flags & BDRV_O_NO_IO) { | |
297 | cflags |= QCRYPTO_BLOCK_OPEN_NO_IO; | |
298 | } | |
1cd9a787 | 299 | crypto->block = qcrypto_block_open(open_opts, NULL, |
78368575 DB |
300 | block_crypto_read_func, |
301 | bs, | |
302 | cflags, | |
303 | errp); | |
304 | ||
305 | if (!crypto->block) { | |
306 | ret = -EIO; | |
307 | goto cleanup; | |
308 | } | |
309 | ||
54115412 | 310 | bs->encrypted = true; |
78368575 DB |
311 | |
312 | ret = 0; | |
313 | cleanup: | |
cb3e7f08 | 314 | qobject_unref(cryptoopts); |
78368575 DB |
315 | qapi_free_QCryptoBlockOpenOptions(open_opts); |
316 | return ret; | |
317 | } | |
318 | ||
319 | ||
1ec4f416 KW |
320 | static int block_crypto_co_create_generic(BlockDriverState *bs, |
321 | int64_t size, | |
322 | QCryptoBlockCreateOptions *opts, | |
323 | Error **errp) | |
78368575 | 324 | { |
1ec4f416 KW |
325 | int ret; |
326 | BlockBackend *blk; | |
78368575 | 327 | QCryptoBlock *crypto = NULL; |
1ec4f416 | 328 | struct BlockCryptoCreateData data; |
306a06e5 | 329 | |
1ec4f416 | 330 | blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL); |
78368575 | 331 | |
1ec4f416 | 332 | ret = blk_insert_bs(blk, bs, errp); |
3b5a1f6a | 333 | if (ret < 0) { |
1ec4f416 | 334 | goto cleanup; |
3b5a1f6a KW |
335 | } |
336 | ||
1ec4f416 KW |
337 | data = (struct BlockCryptoCreateData) { |
338 | .blk = blk, | |
339 | .size = size, | |
340 | }; | |
3b5a1f6a | 341 | |
1ec4f416 | 342 | crypto = qcrypto_block_create(opts, NULL, |
78368575 DB |
343 | block_crypto_init_func, |
344 | block_crypto_write_func, | |
345 | &data, | |
346 | errp); | |
347 | ||
348 | if (!crypto) { | |
349 | ret = -EIO; | |
350 | goto cleanup; | |
351 | } | |
352 | ||
353 | ret = 0; | |
354 | cleanup: | |
355 | qcrypto_block_free(crypto); | |
1ec4f416 | 356 | blk_unref(blk); |
78368575 DB |
357 | return ret; |
358 | } | |
359 | ||
061ca8a3 KW |
360 | static int coroutine_fn |
361 | block_crypto_co_truncate(BlockDriverState *bs, int64_t offset, | |
362 | PreallocMode prealloc, Error **errp) | |
78368575 DB |
363 | { |
364 | BlockCrypto *crypto = bs->opaque; | |
31376555 | 365 | uint64_t payload_offset = |
78368575 | 366 | qcrypto_block_get_payload_offset(crypto->block); |
120bc742 KW |
367 | |
368 | if (payload_offset > INT64_MAX - offset) { | |
369 | error_setg(errp, "The requested file size is too large"); | |
370 | return -EFBIG; | |
371 | } | |
78368575 DB |
372 | |
373 | offset += payload_offset; | |
374 | ||
061ca8a3 | 375 | return bdrv_co_truncate(bs->file, offset, prealloc, errp); |
78368575 DB |
376 | } |
377 | ||
378 | static void block_crypto_close(BlockDriverState *bs) | |
379 | { | |
380 | BlockCrypto *crypto = bs->opaque; | |
381 | qcrypto_block_free(crypto->block); | |
382 | } | |
383 | ||
f87e08f9 DB |
384 | static int block_crypto_reopen_prepare(BDRVReopenState *state, |
385 | BlockReopenQueue *queue, Error **errp) | |
386 | { | |
387 | /* nothing needs checking */ | |
388 | return 0; | |
389 | } | |
78368575 | 390 | |
161253e2 DB |
391 | /* |
392 | * 1 MB bounce buffer gives good performance / memory tradeoff | |
393 | * when using cache=none|directsync. | |
394 | */ | |
395 | #define BLOCK_CRYPTO_MAX_IO_SIZE (1024 * 1024) | |
78368575 DB |
396 | |
397 | static coroutine_fn int | |
a73466fb DB |
398 | block_crypto_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, |
399 | QEMUIOVector *qiov, int flags) | |
78368575 DB |
400 | { |
401 | BlockCrypto *crypto = bs->opaque; | |
a73466fb | 402 | uint64_t cur_bytes; /* number of bytes in current iteration */ |
78368575 DB |
403 | uint64_t bytes_done = 0; |
404 | uint8_t *cipher_data = NULL; | |
405 | QEMUIOVector hd_qiov; | |
406 | int ret = 0; | |
a73466fb DB |
407 | uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block); |
408 | uint64_t payload_offset = qcrypto_block_get_payload_offset(crypto->block); | |
a73466fb DB |
409 | |
410 | assert(!flags); | |
411 | assert(payload_offset < INT64_MAX); | |
412 | assert(QEMU_IS_ALIGNED(offset, sector_size)); | |
413 | assert(QEMU_IS_ALIGNED(bytes, sector_size)); | |
78368575 DB |
414 | |
415 | qemu_iovec_init(&hd_qiov, qiov->niov); | |
416 | ||
161253e2 DB |
417 | /* Bounce buffer because we don't wish to expose cipher text |
418 | * in qiov which points to guest memory. | |
78368575 DB |
419 | */ |
420 | cipher_data = | |
161253e2 | 421 | qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_IO_SIZE, |
78368575 DB |
422 | qiov->size)); |
423 | if (cipher_data == NULL) { | |
424 | ret = -ENOMEM; | |
425 | goto cleanup; | |
426 | } | |
427 | ||
a73466fb DB |
428 | while (bytes) { |
429 | cur_bytes = MIN(bytes, BLOCK_CRYPTO_MAX_IO_SIZE); | |
78368575 DB |
430 | |
431 | qemu_iovec_reset(&hd_qiov); | |
a73466fb | 432 | qemu_iovec_add(&hd_qiov, cipher_data, cur_bytes); |
78368575 | 433 | |
a73466fb DB |
434 | ret = bdrv_co_preadv(bs->file, payload_offset + offset + bytes_done, |
435 | cur_bytes, &hd_qiov, 0); | |
78368575 DB |
436 | if (ret < 0) { |
437 | goto cleanup; | |
438 | } | |
439 | ||
4609742a DB |
440 | if (qcrypto_block_decrypt(crypto->block, offset + bytes_done, |
441 | cipher_data, cur_bytes, NULL) < 0) { | |
78368575 DB |
442 | ret = -EIO; |
443 | goto cleanup; | |
444 | } | |
445 | ||
a73466fb | 446 | qemu_iovec_from_buf(qiov, bytes_done, cipher_data, cur_bytes); |
78368575 | 447 | |
a73466fb DB |
448 | bytes -= cur_bytes; |
449 | bytes_done += cur_bytes; | |
78368575 DB |
450 | } |
451 | ||
452 | cleanup: | |
453 | qemu_iovec_destroy(&hd_qiov); | |
454 | qemu_vfree(cipher_data); | |
455 | ||
456 | return ret; | |
457 | } | |
458 | ||
459 | ||
460 | static coroutine_fn int | |
a73466fb DB |
461 | block_crypto_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, |
462 | QEMUIOVector *qiov, int flags) | |
78368575 DB |
463 | { |
464 | BlockCrypto *crypto = bs->opaque; | |
a73466fb | 465 | uint64_t cur_bytes; /* number of bytes in current iteration */ |
78368575 DB |
466 | uint64_t bytes_done = 0; |
467 | uint8_t *cipher_data = NULL; | |
468 | QEMUIOVector hd_qiov; | |
469 | int ret = 0; | |
a73466fb DB |
470 | uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block); |
471 | uint64_t payload_offset = qcrypto_block_get_payload_offset(crypto->block); | |
a73466fb | 472 | |
d67a6b09 | 473 | assert(!(flags & ~BDRV_REQ_FUA)); |
a73466fb DB |
474 | assert(payload_offset < INT64_MAX); |
475 | assert(QEMU_IS_ALIGNED(offset, sector_size)); | |
476 | assert(QEMU_IS_ALIGNED(bytes, sector_size)); | |
78368575 DB |
477 | |
478 | qemu_iovec_init(&hd_qiov, qiov->niov); | |
479 | ||
161253e2 DB |
480 | /* Bounce buffer because we're not permitted to touch |
481 | * contents of qiov - it points to guest memory. | |
78368575 DB |
482 | */ |
483 | cipher_data = | |
161253e2 | 484 | qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_IO_SIZE, |
78368575 DB |
485 | qiov->size)); |
486 | if (cipher_data == NULL) { | |
487 | ret = -ENOMEM; | |
488 | goto cleanup; | |
489 | } | |
490 | ||
a73466fb DB |
491 | while (bytes) { |
492 | cur_bytes = MIN(bytes, BLOCK_CRYPTO_MAX_IO_SIZE); | |
78368575 | 493 | |
a73466fb | 494 | qemu_iovec_to_buf(qiov, bytes_done, cipher_data, cur_bytes); |
78368575 | 495 | |
4609742a DB |
496 | if (qcrypto_block_encrypt(crypto->block, offset + bytes_done, |
497 | cipher_data, cur_bytes, NULL) < 0) { | |
78368575 DB |
498 | ret = -EIO; |
499 | goto cleanup; | |
500 | } | |
501 | ||
502 | qemu_iovec_reset(&hd_qiov); | |
a73466fb | 503 | qemu_iovec_add(&hd_qiov, cipher_data, cur_bytes); |
78368575 | 504 | |
a73466fb | 505 | ret = bdrv_co_pwritev(bs->file, payload_offset + offset + bytes_done, |
d67a6b09 | 506 | cur_bytes, &hd_qiov, flags); |
78368575 DB |
507 | if (ret < 0) { |
508 | goto cleanup; | |
509 | } | |
510 | ||
a73466fb DB |
511 | bytes -= cur_bytes; |
512 | bytes_done += cur_bytes; | |
78368575 DB |
513 | } |
514 | ||
515 | cleanup: | |
516 | qemu_iovec_destroy(&hd_qiov); | |
517 | qemu_vfree(cipher_data); | |
518 | ||
519 | return ret; | |
520 | } | |
521 | ||
a73466fb DB |
522 | static void block_crypto_refresh_limits(BlockDriverState *bs, Error **errp) |
523 | { | |
524 | BlockCrypto *crypto = bs->opaque; | |
525 | uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block); | |
526 | bs->bl.request_alignment = sector_size; /* No sub-sector I/O */ | |
527 | } | |
528 | ||
78368575 DB |
529 | |
530 | static int64_t block_crypto_getlength(BlockDriverState *bs) | |
531 | { | |
532 | BlockCrypto *crypto = bs->opaque; | |
533 | int64_t len = bdrv_getlength(bs->file->bs); | |
534 | ||
31376555 DB |
535 | uint64_t offset = qcrypto_block_get_payload_offset(crypto->block); |
536 | assert(offset < INT64_MAX); | |
e39e959e KW |
537 | |
538 | if (offset > len) { | |
539 | return -EIO; | |
540 | } | |
78368575 DB |
541 | |
542 | len -= offset; | |
543 | ||
544 | return len; | |
545 | } | |
546 | ||
547 | ||
548 | static int block_crypto_probe_luks(const uint8_t *buf, | |
549 | int buf_size, | |
550 | const char *filename) { | |
551 | return block_crypto_probe_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS, | |
552 | buf, buf_size, filename); | |
553 | } | |
554 | ||
555 | static int block_crypto_open_luks(BlockDriverState *bs, | |
556 | QDict *options, | |
557 | int flags, | |
558 | Error **errp) | |
559 | { | |
560 | return block_crypto_open_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS, | |
561 | &block_crypto_runtime_opts_luks, | |
562 | bs, options, flags, errp); | |
563 | } | |
564 | ||
1bedcaf1 KW |
565 | static int coroutine_fn |
566 | block_crypto_co_create_luks(BlockdevCreateOptions *create_options, Error **errp) | |
567 | { | |
568 | BlockdevCreateOptionsLUKS *luks_opts; | |
569 | BlockDriverState *bs = NULL; | |
570 | QCryptoBlockCreateOptions create_opts; | |
571 | int ret; | |
572 | ||
573 | assert(create_options->driver == BLOCKDEV_DRIVER_LUKS); | |
574 | luks_opts = &create_options->u.luks; | |
575 | ||
576 | bs = bdrv_open_blockdev_ref(luks_opts->file, errp); | |
577 | if (bs == NULL) { | |
578 | return -EIO; | |
579 | } | |
580 | ||
581 | create_opts = (QCryptoBlockCreateOptions) { | |
582 | .format = Q_CRYPTO_BLOCK_FORMAT_LUKS, | |
583 | .u.luks = *qapi_BlockdevCreateOptionsLUKS_base(luks_opts), | |
584 | }; | |
585 | ||
586 | ret = block_crypto_co_create_generic(bs, luks_opts->size, &create_opts, | |
587 | errp); | |
588 | if (ret < 0) { | |
589 | goto fail; | |
590 | } | |
591 | ||
592 | ret = 0; | |
593 | fail: | |
594 | bdrv_unref(bs); | |
595 | return ret; | |
596 | } | |
597 | ||
efc75e2a SH |
598 | static int coroutine_fn block_crypto_co_create_opts_luks(const char *filename, |
599 | QemuOpts *opts, | |
600 | Error **errp) | |
78368575 | 601 | { |
1ec4f416 KW |
602 | QCryptoBlockCreateOptions *create_opts = NULL; |
603 | BlockDriverState *bs = NULL; | |
604 | QDict *cryptoopts; | |
605 | int64_t size; | |
606 | int ret; | |
607 | ||
608 | /* Parse options */ | |
609 | size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0); | |
610 | ||
611 | cryptoopts = qemu_opts_to_qdict_filtered(opts, NULL, | |
612 | &block_crypto_create_opts_luks, | |
613 | true); | |
614 | ||
615 | create_opts = block_crypto_create_opts_init(Q_CRYPTO_BLOCK_FORMAT_LUKS, | |
616 | cryptoopts, errp); | |
617 | if (!create_opts) { | |
618 | ret = -EINVAL; | |
619 | goto fail; | |
620 | } | |
621 | ||
622 | /* Create protocol layer */ | |
623 | ret = bdrv_create_file(filename, opts, errp); | |
624 | if (ret < 0) { | |
625 | return ret; | |
626 | } | |
627 | ||
628 | bs = bdrv_open(filename, NULL, NULL, | |
629 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); | |
630 | if (!bs) { | |
631 | ret = -EINVAL; | |
632 | goto fail; | |
633 | } | |
634 | ||
635 | /* Create format layer */ | |
636 | ret = block_crypto_co_create_generic(bs, size, create_opts, errp); | |
637 | if (ret < 0) { | |
638 | goto fail; | |
639 | } | |
640 | ||
641 | ret = 0; | |
642 | fail: | |
643 | bdrv_unref(bs); | |
644 | qapi_free_QCryptoBlockCreateOptions(create_opts); | |
cb3e7f08 | 645 | qobject_unref(cryptoopts); |
1ec4f416 | 646 | return ret; |
78368575 DB |
647 | } |
648 | ||
c7c4cf49 DB |
649 | static int block_crypto_get_info_luks(BlockDriverState *bs, |
650 | BlockDriverInfo *bdi) | |
651 | { | |
652 | BlockDriverInfo subbdi; | |
653 | int ret; | |
654 | ||
655 | ret = bdrv_get_info(bs->file->bs, &subbdi); | |
656 | if (ret != 0) { | |
657 | return ret; | |
658 | } | |
659 | ||
660 | bdi->unallocated_blocks_are_zero = false; | |
c7c4cf49 DB |
661 | bdi->cluster_size = subbdi.cluster_size; |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
666 | static ImageInfoSpecific * | |
667 | block_crypto_get_specific_info_luks(BlockDriverState *bs) | |
668 | { | |
669 | BlockCrypto *crypto = bs->opaque; | |
670 | ImageInfoSpecific *spec_info; | |
671 | QCryptoBlockInfo *info; | |
672 | ||
673 | info = qcrypto_block_get_info(crypto->block, NULL); | |
674 | if (!info) { | |
675 | return NULL; | |
676 | } | |
677 | if (info->format != Q_CRYPTO_BLOCK_FORMAT_LUKS) { | |
678 | qapi_free_QCryptoBlockInfo(info); | |
679 | return NULL; | |
680 | } | |
681 | ||
682 | spec_info = g_new(ImageInfoSpecific, 1); | |
683 | spec_info->type = IMAGE_INFO_SPECIFIC_KIND_LUKS; | |
684 | spec_info->u.luks.data = g_new(QCryptoBlockInfoLUKS, 1); | |
685 | *spec_info->u.luks.data = info->u.luks; | |
686 | ||
687 | /* Blank out pointers we've just stolen to avoid double free */ | |
688 | memset(&info->u.luks, 0, sizeof(info->u.luks)); | |
689 | ||
690 | qapi_free_QCryptoBlockInfo(info); | |
691 | ||
692 | return spec_info; | |
693 | } | |
694 | ||
78368575 DB |
695 | BlockDriver bdrv_crypto_luks = { |
696 | .format_name = "luks", | |
697 | .instance_size = sizeof(BlockCrypto), | |
698 | .bdrv_probe = block_crypto_probe_luks, | |
699 | .bdrv_open = block_crypto_open_luks, | |
700 | .bdrv_close = block_crypto_close, | |
862f215f | 701 | .bdrv_child_perm = bdrv_format_default_perms, |
1bedcaf1 | 702 | .bdrv_co_create = block_crypto_co_create_luks, |
efc75e2a | 703 | .bdrv_co_create_opts = block_crypto_co_create_opts_luks, |
061ca8a3 | 704 | .bdrv_co_truncate = block_crypto_co_truncate, |
78368575 DB |
705 | .create_opts = &block_crypto_create_opts_luks, |
706 | ||
f87e08f9 | 707 | .bdrv_reopen_prepare = block_crypto_reopen_prepare, |
a73466fb DB |
708 | .bdrv_refresh_limits = block_crypto_refresh_limits, |
709 | .bdrv_co_preadv = block_crypto_co_preadv, | |
710 | .bdrv_co_pwritev = block_crypto_co_pwritev, | |
78368575 | 711 | .bdrv_getlength = block_crypto_getlength, |
c7c4cf49 DB |
712 | .bdrv_get_info = block_crypto_get_info_luks, |
713 | .bdrv_get_specific_info = block_crypto_get_specific_info_luks, | |
78368575 DB |
714 | }; |
715 | ||
716 | static void block_crypto_init(void) | |
717 | { | |
718 | bdrv_register(&bdrv_crypto_luks); | |
719 | } | |
720 | ||
721 | block_init(block_crypto_init); |