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Commit | Line | Data |
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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 | |
61f3c91a | 9 | * version 2.1 of the License, or (at your option) any later version. |
78368575 DB |
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" |
0b8fa32f | 31 | #include "qemu/module.h" |
922a01a0 | 32 | #include "qemu/option.h" |
1bba30da | 33 | #include "qemu/cutils.h" |
5df022cf | 34 | #include "qemu/memalign.h" |
0d8c41da | 35 | #include "crypto.h" |
78368575 DB |
36 | |
37 | typedef struct BlockCrypto BlockCrypto; | |
38 | ||
39 | struct BlockCrypto { | |
40 | QCryptoBlock *block; | |
bbfdae91 | 41 | bool updating_keys; |
78368575 DB |
42 | }; |
43 | ||
44 | ||
45 | static int block_crypto_probe_generic(QCryptoBlockFormat format, | |
46 | const uint8_t *buf, | |
47 | int buf_size, | |
48 | const char *filename) | |
49 | { | |
50 | if (qcrypto_block_has_format(format, buf, buf_size)) { | |
51 | return 100; | |
52 | } else { | |
53 | return 0; | |
54 | } | |
55 | } | |
56 | ||
57 | ||
757dda54 AF |
58 | static int block_crypto_read_func(QCryptoBlock *block, |
59 | size_t offset, | |
60 | uint8_t *buf, | |
61 | size_t buflen, | |
62 | void *opaque, | |
63 | Error **errp) | |
78368575 DB |
64 | { |
65 | BlockDriverState *bs = opaque; | |
66 | ssize_t ret; | |
67 | ||
1f051dcb KW |
68 | GLOBAL_STATE_CODE(); |
69 | GRAPH_RDLOCK_GUARD_MAINLOOP(); | |
70 | ||
32cc71de | 71 | ret = bdrv_pread(bs->file, offset, buflen, buf, 0); |
78368575 DB |
72 | if (ret < 0) { |
73 | error_setg_errno(errp, -ret, "Could not read encryption header"); | |
74 | return ret; | |
75 | } | |
757dda54 | 76 | return 0; |
78368575 DB |
77 | } |
78 | ||
757dda54 AF |
79 | static int block_crypto_write_func(QCryptoBlock *block, |
80 | size_t offset, | |
81 | const uint8_t *buf, | |
82 | size_t buflen, | |
83 | void *opaque, | |
84 | Error **errp) | |
bbfdae91 ML |
85 | { |
86 | BlockDriverState *bs = opaque; | |
87 | ssize_t ret; | |
88 | ||
1f051dcb KW |
89 | GLOBAL_STATE_CODE(); |
90 | GRAPH_RDLOCK_GUARD_MAINLOOP(); | |
91 | ||
32cc71de | 92 | ret = bdrv_pwrite(bs->file, offset, buflen, buf, 0); |
bbfdae91 ML |
93 | if (ret < 0) { |
94 | error_setg_errno(errp, -ret, "Could not write encryption header"); | |
95 | return ret; | |
96 | } | |
757dda54 | 97 | return 0; |
bbfdae91 ML |
98 | } |
99 | ||
78368575 DB |
100 | |
101 | struct BlockCryptoCreateData { | |
78368575 DB |
102 | BlockBackend *blk; |
103 | uint64_t size; | |
672de729 | 104 | PreallocMode prealloc; |
78368575 DB |
105 | }; |
106 | ||
107 | ||
4db7ba3b KW |
108 | static int coroutine_fn GRAPH_UNLOCKED |
109 | block_crypto_create_write_func(QCryptoBlock *block, size_t offset, | |
110 | const uint8_t *buf, size_t buflen, void *opaque, | |
111 | Error **errp) | |
78368575 DB |
112 | { |
113 | struct BlockCryptoCreateData *data = opaque; | |
114 | ssize_t ret; | |
115 | ||
a9262f55 | 116 | ret = blk_pwrite(data->blk, offset, buflen, buf, 0); |
78368575 DB |
117 | if (ret < 0) { |
118 | error_setg_errno(errp, -ret, "Could not write encryption header"); | |
119 | return ret; | |
120 | } | |
757dda54 | 121 | return 0; |
78368575 DB |
122 | } |
123 | ||
4db7ba3b KW |
124 | static int coroutine_fn GRAPH_UNLOCKED |
125 | block_crypto_create_init_func(QCryptoBlock *block, size_t headerlen, | |
126 | void *opaque, Error **errp) | |
78368575 DB |
127 | { |
128 | struct BlockCryptoCreateData *data = opaque; | |
3d1900a4 ML |
129 | Error *local_error = NULL; |
130 | int ret; | |
78368575 | 131 | |
3d7ed9c4 | 132 | if (data->size > INT64_MAX || headerlen > INT64_MAX - data->size) { |
3d1900a4 ML |
133 | ret = -EFBIG; |
134 | goto error; | |
3d7ed9c4 KW |
135 | } |
136 | ||
78368575 DB |
137 | /* User provided size should reflect amount of space made |
138 | * available to the guest, so we must take account of that | |
139 | * which will be used by the crypto header | |
140 | */ | |
3d1900a4 ML |
141 | ret = blk_truncate(data->blk, data->size + headerlen, false, |
142 | data->prealloc, 0, &local_error); | |
143 | ||
144 | if (ret >= 0) { | |
757dda54 | 145 | return 0; |
3d1900a4 ML |
146 | } |
147 | ||
148 | error: | |
149 | if (ret == -EFBIG) { | |
150 | /* Replace the error message with a better one */ | |
151 | error_free(local_error); | |
152 | error_setg(errp, "The requested file size is too large"); | |
153 | } else { | |
154 | error_propagate(errp, local_error); | |
155 | } | |
156 | ||
157 | return ret; | |
78368575 DB |
158 | } |
159 | ||
160 | ||
161 | static QemuOptsList block_crypto_runtime_opts_luks = { | |
162 | .name = "crypto", | |
163 | .head = QTAILQ_HEAD_INITIALIZER(block_crypto_runtime_opts_luks.head), | |
164 | .desc = { | |
4a47f854 | 165 | BLOCK_CRYPTO_OPT_DEF_LUKS_KEY_SECRET(""), |
78368575 DB |
166 | { /* end of list */ } |
167 | }, | |
168 | }; | |
169 | ||
170 | ||
171 | static QemuOptsList block_crypto_create_opts_luks = { | |
172 | .name = "crypto", | |
173 | .head = QTAILQ_HEAD_INITIALIZER(block_crypto_create_opts_luks.head), | |
174 | .desc = { | |
175 | { | |
176 | .name = BLOCK_OPT_SIZE, | |
177 | .type = QEMU_OPT_SIZE, | |
178 | .help = "Virtual disk size" | |
179 | }, | |
4a47f854 DB |
180 | BLOCK_CRYPTO_OPT_DEF_LUKS_KEY_SECRET(""), |
181 | BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_ALG(""), | |
182 | BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_MODE(""), | |
183 | BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_ALG(""), | |
184 | BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_HASH_ALG(""), | |
185 | BLOCK_CRYPTO_OPT_DEF_LUKS_HASH_ALG(""), | |
186 | BLOCK_CRYPTO_OPT_DEF_LUKS_ITER_TIME(""), | |
78368575 DB |
187 | { /* end of list */ } |
188 | }, | |
189 | }; | |
190 | ||
191 | ||
bbfdae91 ML |
192 | static QemuOptsList block_crypto_amend_opts_luks = { |
193 | .name = "crypto", | |
194 | .head = QTAILQ_HEAD_INITIALIZER(block_crypto_create_opts_luks.head), | |
195 | .desc = { | |
196 | BLOCK_CRYPTO_OPT_DEF_LUKS_STATE(""), | |
197 | BLOCK_CRYPTO_OPT_DEF_LUKS_KEYSLOT(""), | |
198 | BLOCK_CRYPTO_OPT_DEF_LUKS_OLD_SECRET(""), | |
199 | BLOCK_CRYPTO_OPT_DEF_LUKS_NEW_SECRET(""), | |
200 | BLOCK_CRYPTO_OPT_DEF_LUKS_ITER_TIME(""), | |
201 | { /* end of list */ } | |
202 | }, | |
203 | }; | |
204 | ||
306a06e5 | 205 | QCryptoBlockOpenOptions * |
796d3239 | 206 | block_crypto_open_opts_init(QDict *opts, Error **errp) |
78368575 | 207 | { |
09204eac | 208 | Visitor *v; |
796d3239 | 209 | QCryptoBlockOpenOptions *ret; |
78368575 | 210 | |
796d3239 | 211 | v = qobject_input_visitor_new_flat_confused(opts, errp); |
e6af90f3 | 212 | if (!v) { |
796d3239 | 213 | return NULL; |
f853465a | 214 | } |
78368575 | 215 | |
796d3239 | 216 | visit_type_QCryptoBlockOpenOptions(v, NULL, &ret, errp); |
78368575 | 217 | |
09204eac | 218 | visit_free(v); |
78368575 DB |
219 | return ret; |
220 | } | |
221 | ||
222 | ||
306a06e5 | 223 | QCryptoBlockCreateOptions * |
796d3239 | 224 | block_crypto_create_opts_init(QDict *opts, Error **errp) |
78368575 | 225 | { |
09204eac | 226 | Visitor *v; |
796d3239 | 227 | QCryptoBlockCreateOptions *ret; |
78368575 | 228 | |
796d3239 | 229 | v = qobject_input_visitor_new_flat_confused(opts, errp); |
e6af90f3 | 230 | if (!v) { |
796d3239 | 231 | return NULL; |
f853465a | 232 | } |
78368575 | 233 | |
796d3239 | 234 | visit_type_QCryptoBlockCreateOptions(v, NULL, &ret, errp); |
78368575 | 235 | |
09204eac | 236 | visit_free(v); |
78368575 DB |
237 | return ret; |
238 | } | |
239 | ||
43cbd06d ML |
240 | QCryptoBlockAmendOptions * |
241 | block_crypto_amend_opts_init(QDict *opts, Error **errp) | |
242 | { | |
243 | Visitor *v; | |
244 | QCryptoBlockAmendOptions *ret; | |
245 | ||
246 | v = qobject_input_visitor_new_flat_confused(opts, errp); | |
247 | if (!v) { | |
248 | return NULL; | |
249 | } | |
250 | ||
251 | visit_type_QCryptoBlockAmendOptions(v, NULL, &ret, errp); | |
252 | ||
253 | visit_free(v); | |
254 | return ret; | |
255 | } | |
256 | ||
78368575 DB |
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; | |
83930780 | 267 | int ret; |
78368575 DB |
268 | QCryptoBlockOpenOptions *open_opts = NULL; |
269 | unsigned int cflags = 0; | |
306a06e5 | 270 | QDict *cryptoopts = NULL; |
78368575 | 271 | |
a4b740db KW |
272 | GLOBAL_STATE_CODE(); |
273 | ||
83930780 VSO |
274 | ret = bdrv_open_file_child(NULL, options, "file", bs, errp); |
275 | if (ret < 0) { | |
276 | return ret; | |
4e4bf5c4 KW |
277 | } |
278 | ||
a4b740db KW |
279 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
280 | ||
d67a6b09 DB |
281 | bs->supported_write_flags = BDRV_REQ_FUA & |
282 | bs->file->bs->supported_write_flags; | |
283 | ||
78368575 | 284 | opts = qemu_opts_create(opts_spec, NULL, 0, &error_abort); |
af175e85 | 285 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
83930780 | 286 | ret = -EINVAL; |
78368575 DB |
287 | goto cleanup; |
288 | } | |
289 | ||
306a06e5 | 290 | cryptoopts = qemu_opts_to_qdict(opts, NULL); |
796d3239 | 291 | qdict_put_str(cryptoopts, "format", QCryptoBlockFormat_str(format)); |
306a06e5 | 292 | |
796d3239 | 293 | open_opts = block_crypto_open_opts_init(cryptoopts, errp); |
78368575 | 294 | if (!open_opts) { |
83930780 | 295 | ret = -EINVAL; |
78368575 DB |
296 | goto cleanup; |
297 | } | |
298 | ||
299 | if (flags & BDRV_O_NO_IO) { | |
300 | cflags |= QCRYPTO_BLOCK_OPEN_NO_IO; | |
301 | } | |
1cd9a787 | 302 | crypto->block = qcrypto_block_open(open_opts, NULL, |
78368575 DB |
303 | block_crypto_read_func, |
304 | bs, | |
305 | cflags, | |
c972fa12 | 306 | 1, |
78368575 DB |
307 | errp); |
308 | ||
309 | if (!crypto->block) { | |
310 | ret = -EIO; | |
311 | goto cleanup; | |
312 | } | |
313 | ||
54115412 | 314 | bs->encrypted = true; |
78368575 DB |
315 | |
316 | ret = 0; | |
317 | cleanup: | |
cb3e7f08 | 318 | qobject_unref(cryptoopts); |
78368575 DB |
319 | qapi_free_QCryptoBlockOpenOptions(open_opts); |
320 | return ret; | |
321 | } | |
322 | ||
323 | ||
4db7ba3b | 324 | static int coroutine_fn GRAPH_UNLOCKED |
91817e9c KW |
325 | block_crypto_co_create_generic(BlockDriverState *bs, int64_t size, |
326 | QCryptoBlockCreateOptions *opts, | |
327 | PreallocMode prealloc, Error **errp) | |
78368575 | 328 | { |
1ec4f416 KW |
329 | int ret; |
330 | BlockBackend *blk; | |
78368575 | 331 | QCryptoBlock *crypto = NULL; |
1ec4f416 | 332 | struct BlockCryptoCreateData data; |
306a06e5 | 333 | |
91817e9c KW |
334 | blk = blk_co_new_with_bs(bs, BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL, |
335 | errp); | |
a3aeeab5 EB |
336 | if (!blk) { |
337 | ret = -EPERM; | |
1ec4f416 | 338 | goto cleanup; |
3b5a1f6a KW |
339 | } |
340 | ||
672de729 ML |
341 | if (prealloc == PREALLOC_MODE_METADATA) { |
342 | prealloc = PREALLOC_MODE_OFF; | |
343 | } | |
344 | ||
1ec4f416 KW |
345 | data = (struct BlockCryptoCreateData) { |
346 | .blk = blk, | |
347 | .size = size, | |
672de729 | 348 | .prealloc = prealloc, |
1ec4f416 | 349 | }; |
3b5a1f6a | 350 | |
1ec4f416 | 351 | crypto = qcrypto_block_create(opts, NULL, |
e0d0ddc5 ML |
352 | block_crypto_create_init_func, |
353 | block_crypto_create_write_func, | |
78368575 DB |
354 | &data, |
355 | errp); | |
356 | ||
357 | if (!crypto) { | |
358 | ret = -EIO; | |
359 | goto cleanup; | |
360 | } | |
361 | ||
362 | ret = 0; | |
363 | cleanup: | |
364 | qcrypto_block_free(crypto); | |
b2ab5f54 | 365 | blk_co_unref(blk); |
78368575 DB |
366 | return ret; |
367 | } | |
368 | ||
c2b8e315 | 369 | static int coroutine_fn GRAPH_RDLOCK |
c80d8b06 | 370 | block_crypto_co_truncate(BlockDriverState *bs, int64_t offset, bool exact, |
92b92799 KW |
371 | PreallocMode prealloc, BdrvRequestFlags flags, |
372 | Error **errp) | |
78368575 DB |
373 | { |
374 | BlockCrypto *crypto = bs->opaque; | |
31376555 | 375 | uint64_t payload_offset = |
78368575 | 376 | qcrypto_block_get_payload_offset(crypto->block); |
120bc742 KW |
377 | |
378 | if (payload_offset > INT64_MAX - offset) { | |
379 | error_setg(errp, "The requested file size is too large"); | |
380 | return -EFBIG; | |
381 | } | |
78368575 DB |
382 | |
383 | offset += payload_offset; | |
384 | ||
7b8e4857 | 385 | return bdrv_co_truncate(bs->file, offset, exact, prealloc, 0, errp); |
78368575 DB |
386 | } |
387 | ||
388 | static void block_crypto_close(BlockDriverState *bs) | |
389 | { | |
390 | BlockCrypto *crypto = bs->opaque; | |
391 | qcrypto_block_free(crypto->block); | |
392 | } | |
393 | ||
f87e08f9 DB |
394 | static int block_crypto_reopen_prepare(BDRVReopenState *state, |
395 | BlockReopenQueue *queue, Error **errp) | |
396 | { | |
397 | /* nothing needs checking */ | |
398 | return 0; | |
399 | } | |
78368575 | 400 | |
161253e2 DB |
401 | /* |
402 | * 1 MB bounce buffer gives good performance / memory tradeoff | |
403 | * when using cache=none|directsync. | |
404 | */ | |
405 | #define BLOCK_CRYPTO_MAX_IO_SIZE (1024 * 1024) | |
78368575 | 406 | |
b9b10c35 | 407 | static int coroutine_fn GRAPH_RDLOCK |
f7ef38dd VSO |
408 | block_crypto_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, |
409 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
78368575 DB |
410 | { |
411 | BlockCrypto *crypto = bs->opaque; | |
a73466fb | 412 | uint64_t cur_bytes; /* number of bytes in current iteration */ |
78368575 DB |
413 | uint64_t bytes_done = 0; |
414 | uint8_t *cipher_data = NULL; | |
415 | QEMUIOVector hd_qiov; | |
416 | int ret = 0; | |
a73466fb DB |
417 | uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block); |
418 | uint64_t payload_offset = qcrypto_block_get_payload_offset(crypto->block); | |
a73466fb | 419 | |
a73466fb DB |
420 | assert(payload_offset < INT64_MAX); |
421 | assert(QEMU_IS_ALIGNED(offset, sector_size)); | |
422 | assert(QEMU_IS_ALIGNED(bytes, sector_size)); | |
78368575 DB |
423 | |
424 | qemu_iovec_init(&hd_qiov, qiov->niov); | |
425 | ||
161253e2 DB |
426 | /* Bounce buffer because we don't wish to expose cipher text |
427 | * in qiov which points to guest memory. | |
78368575 DB |
428 | */ |
429 | cipher_data = | |
161253e2 | 430 | qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_IO_SIZE, |
78368575 DB |
431 | qiov->size)); |
432 | if (cipher_data == NULL) { | |
433 | ret = -ENOMEM; | |
434 | goto cleanup; | |
435 | } | |
436 | ||
a73466fb DB |
437 | while (bytes) { |
438 | cur_bytes = MIN(bytes, BLOCK_CRYPTO_MAX_IO_SIZE); | |
78368575 DB |
439 | |
440 | qemu_iovec_reset(&hd_qiov); | |
a73466fb | 441 | qemu_iovec_add(&hd_qiov, cipher_data, cur_bytes); |
78368575 | 442 | |
a73466fb DB |
443 | ret = bdrv_co_preadv(bs->file, payload_offset + offset + bytes_done, |
444 | cur_bytes, &hd_qiov, 0); | |
78368575 DB |
445 | if (ret < 0) { |
446 | goto cleanup; | |
447 | } | |
448 | ||
4609742a DB |
449 | if (qcrypto_block_decrypt(crypto->block, offset + bytes_done, |
450 | cipher_data, cur_bytes, NULL) < 0) { | |
78368575 DB |
451 | ret = -EIO; |
452 | goto cleanup; | |
453 | } | |
454 | ||
a73466fb | 455 | qemu_iovec_from_buf(qiov, bytes_done, cipher_data, cur_bytes); |
78368575 | 456 | |
a73466fb DB |
457 | bytes -= cur_bytes; |
458 | bytes_done += cur_bytes; | |
78368575 DB |
459 | } |
460 | ||
461 | cleanup: | |
462 | qemu_iovec_destroy(&hd_qiov); | |
463 | qemu_vfree(cipher_data); | |
464 | ||
465 | return ret; | |
466 | } | |
467 | ||
468 | ||
b9b10c35 | 469 | static int coroutine_fn GRAPH_RDLOCK |
e75abeda VSO |
470 | block_crypto_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, |
471 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
78368575 DB |
472 | { |
473 | BlockCrypto *crypto = bs->opaque; | |
a73466fb | 474 | uint64_t cur_bytes; /* number of bytes in current iteration */ |
78368575 DB |
475 | uint64_t bytes_done = 0; |
476 | uint8_t *cipher_data = NULL; | |
477 | QEMUIOVector hd_qiov; | |
478 | int ret = 0; | |
a73466fb DB |
479 | uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block); |
480 | uint64_t payload_offset = qcrypto_block_get_payload_offset(crypto->block); | |
a73466fb | 481 | |
e8b65355 SH |
482 | flags &= ~BDRV_REQ_REGISTERED_BUF; |
483 | ||
a73466fb DB |
484 | assert(payload_offset < INT64_MAX); |
485 | assert(QEMU_IS_ALIGNED(offset, sector_size)); | |
486 | assert(QEMU_IS_ALIGNED(bytes, sector_size)); | |
78368575 DB |
487 | |
488 | qemu_iovec_init(&hd_qiov, qiov->niov); | |
489 | ||
161253e2 DB |
490 | /* Bounce buffer because we're not permitted to touch |
491 | * contents of qiov - it points to guest memory. | |
78368575 DB |
492 | */ |
493 | cipher_data = | |
161253e2 | 494 | qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_IO_SIZE, |
78368575 DB |
495 | qiov->size)); |
496 | if (cipher_data == NULL) { | |
497 | ret = -ENOMEM; | |
498 | goto cleanup; | |
499 | } | |
500 | ||
a73466fb DB |
501 | while (bytes) { |
502 | cur_bytes = MIN(bytes, BLOCK_CRYPTO_MAX_IO_SIZE); | |
78368575 | 503 | |
a73466fb | 504 | qemu_iovec_to_buf(qiov, bytes_done, cipher_data, cur_bytes); |
78368575 | 505 | |
4609742a DB |
506 | if (qcrypto_block_encrypt(crypto->block, offset + bytes_done, |
507 | cipher_data, cur_bytes, NULL) < 0) { | |
78368575 DB |
508 | ret = -EIO; |
509 | goto cleanup; | |
510 | } | |
511 | ||
512 | qemu_iovec_reset(&hd_qiov); | |
a73466fb | 513 | qemu_iovec_add(&hd_qiov, cipher_data, cur_bytes); |
78368575 | 514 | |
a73466fb | 515 | ret = bdrv_co_pwritev(bs->file, payload_offset + offset + bytes_done, |
d67a6b09 | 516 | cur_bytes, &hd_qiov, flags); |
78368575 DB |
517 | if (ret < 0) { |
518 | goto cleanup; | |
519 | } | |
520 | ||
a73466fb DB |
521 | bytes -= cur_bytes; |
522 | bytes_done += cur_bytes; | |
78368575 DB |
523 | } |
524 | ||
525 | cleanup: | |
526 | qemu_iovec_destroy(&hd_qiov); | |
527 | qemu_vfree(cipher_data); | |
528 | ||
529 | return ret; | |
530 | } | |
531 | ||
a73466fb DB |
532 | static void block_crypto_refresh_limits(BlockDriverState *bs, Error **errp) |
533 | { | |
534 | BlockCrypto *crypto = bs->opaque; | |
535 | uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block); | |
536 | bs->bl.request_alignment = sector_size; /* No sub-sector I/O */ | |
537 | } | |
538 | ||
78368575 | 539 | |
8ab8140a KW |
540 | static int64_t coroutine_fn GRAPH_RDLOCK |
541 | block_crypto_co_getlength(BlockDriverState *bs) | |
78368575 DB |
542 | { |
543 | BlockCrypto *crypto = bs->opaque; | |
c86422c5 | 544 | int64_t len = bdrv_co_getlength(bs->file->bs); |
78368575 | 545 | |
31376555 DB |
546 | uint64_t offset = qcrypto_block_get_payload_offset(crypto->block); |
547 | assert(offset < INT64_MAX); | |
e39e959e KW |
548 | |
549 | if (offset > len) { | |
550 | return -EIO; | |
551 | } | |
78368575 DB |
552 | |
553 | len -= offset; | |
554 | ||
555 | return len; | |
556 | } | |
557 | ||
558 | ||
a9da6e49 SH |
559 | static BlockMeasureInfo *block_crypto_measure(QemuOpts *opts, |
560 | BlockDriverState *in_bs, | |
561 | Error **errp) | |
562 | { | |
563 | g_autoptr(QCryptoBlockCreateOptions) create_opts = NULL; | |
564 | Error *local_err = NULL; | |
565 | BlockMeasureInfo *info; | |
566 | uint64_t size; | |
567 | size_t luks_payload_size; | |
568 | QDict *cryptoopts; | |
569 | ||
570 | /* | |
571 | * Preallocation mode doesn't affect size requirements but we must consume | |
572 | * the option. | |
573 | */ | |
574 | g_free(qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC)); | |
575 | ||
576 | size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0); | |
577 | ||
578 | if (in_bs) { | |
579 | int64_t ssize = bdrv_getlength(in_bs); | |
580 | ||
581 | if (ssize < 0) { | |
582 | error_setg_errno(&local_err, -ssize, | |
583 | "Unable to get image virtual_size"); | |
584 | goto err; | |
585 | } | |
586 | ||
587 | size = ssize; | |
588 | } | |
589 | ||
590 | cryptoopts = qemu_opts_to_qdict_filtered(opts, NULL, | |
591 | &block_crypto_create_opts_luks, true); | |
592 | qdict_put_str(cryptoopts, "format", "luks"); | |
593 | create_opts = block_crypto_create_opts_init(cryptoopts, &local_err); | |
594 | qobject_unref(cryptoopts); | |
595 | if (!create_opts) { | |
596 | goto err; | |
597 | } | |
598 | ||
599 | if (!qcrypto_block_calculate_payload_offset(create_opts, NULL, | |
600 | &luks_payload_size, | |
601 | &local_err)) { | |
602 | goto err; | |
603 | } | |
604 | ||
605 | /* | |
606 | * Unallocated blocks are still encrypted so allocation status makes no | |
607 | * difference to the file size. | |
608 | */ | |
5d72c68b | 609 | info = g_new0(BlockMeasureInfo, 1); |
a9da6e49 SH |
610 | info->fully_allocated = luks_payload_size + size; |
611 | info->required = luks_payload_size + size; | |
612 | return info; | |
613 | ||
614 | err: | |
615 | error_propagate(errp, local_err); | |
616 | return NULL; | |
617 | } | |
618 | ||
619 | ||
78368575 DB |
620 | static int block_crypto_probe_luks(const uint8_t *buf, |
621 | int buf_size, | |
622 | const char *filename) { | |
623 | return block_crypto_probe_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS, | |
624 | buf, buf_size, filename); | |
625 | } | |
626 | ||
627 | static int block_crypto_open_luks(BlockDriverState *bs, | |
628 | QDict *options, | |
629 | int flags, | |
630 | Error **errp) | |
631 | { | |
632 | return block_crypto_open_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS, | |
633 | &block_crypto_runtime_opts_luks, | |
634 | bs, options, flags, errp); | |
635 | } | |
636 | ||
4db7ba3b | 637 | static int coroutine_fn GRAPH_UNLOCKED |
1bedcaf1 KW |
638 | block_crypto_co_create_luks(BlockdevCreateOptions *create_options, Error **errp) |
639 | { | |
640 | BlockdevCreateOptionsLUKS *luks_opts; | |
641 | BlockDriverState *bs = NULL; | |
642 | QCryptoBlockCreateOptions create_opts; | |
672de729 | 643 | PreallocMode preallocation = PREALLOC_MODE_OFF; |
1bedcaf1 KW |
644 | int ret; |
645 | ||
646 | assert(create_options->driver == BLOCKDEV_DRIVER_LUKS); | |
647 | luks_opts = &create_options->u.luks; | |
648 | ||
91817e9c | 649 | bs = bdrv_co_open_blockdev_ref(luks_opts->file, errp); |
1bedcaf1 KW |
650 | if (bs == NULL) { |
651 | return -EIO; | |
652 | } | |
653 | ||
654 | create_opts = (QCryptoBlockCreateOptions) { | |
655 | .format = Q_CRYPTO_BLOCK_FORMAT_LUKS, | |
656 | .u.luks = *qapi_BlockdevCreateOptionsLUKS_base(luks_opts), | |
657 | }; | |
658 | ||
672de729 ML |
659 | if (luks_opts->has_preallocation) { |
660 | preallocation = luks_opts->preallocation; | |
661 | } | |
662 | ||
1bedcaf1 | 663 | ret = block_crypto_co_create_generic(bs, luks_opts->size, &create_opts, |
672de729 | 664 | preallocation, errp); |
1bedcaf1 KW |
665 | if (ret < 0) { |
666 | goto fail; | |
667 | } | |
668 | ||
669 | ret = 0; | |
670 | fail: | |
b2ab5f54 | 671 | bdrv_co_unref(bs); |
1bedcaf1 KW |
672 | return ret; |
673 | } | |
674 | ||
4db7ba3b | 675 | static int coroutine_fn GRAPH_UNLOCKED |
4ec8df01 KW |
676 | block_crypto_co_create_opts_luks(BlockDriver *drv, const char *filename, |
677 | QemuOpts *opts, Error **errp) | |
78368575 | 678 | { |
1ec4f416 KW |
679 | QCryptoBlockCreateOptions *create_opts = NULL; |
680 | BlockDriverState *bs = NULL; | |
681 | QDict *cryptoopts; | |
672de729 ML |
682 | PreallocMode prealloc; |
683 | char *buf = NULL; | |
1ec4f416 KW |
684 | int64_t size; |
685 | int ret; | |
672de729 | 686 | Error *local_err = NULL; |
1ec4f416 KW |
687 | |
688 | /* Parse options */ | |
689 | size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0); | |
690 | ||
672de729 ML |
691 | buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); |
692 | prealloc = qapi_enum_parse(&PreallocMode_lookup, buf, | |
693 | PREALLOC_MODE_OFF, &local_err); | |
694 | g_free(buf); | |
695 | if (local_err) { | |
696 | error_propagate(errp, local_err); | |
697 | return -EINVAL; | |
698 | } | |
699 | ||
1ec4f416 KW |
700 | cryptoopts = qemu_opts_to_qdict_filtered(opts, NULL, |
701 | &block_crypto_create_opts_luks, | |
702 | true); | |
703 | ||
796d3239 MA |
704 | qdict_put_str(cryptoopts, "format", "luks"); |
705 | create_opts = block_crypto_create_opts_init(cryptoopts, errp); | |
1ec4f416 KW |
706 | if (!create_opts) { |
707 | ret = -EINVAL; | |
708 | goto fail; | |
709 | } | |
710 | ||
711 | /* Create protocol layer */ | |
2475a0d0 | 712 | ret = bdrv_co_create_file(filename, opts, errp); |
1ec4f416 | 713 | if (ret < 0) { |
0b68589d | 714 | goto fail; |
1ec4f416 KW |
715 | } |
716 | ||
91817e9c KW |
717 | bs = bdrv_co_open(filename, NULL, NULL, |
718 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); | |
1ec4f416 KW |
719 | if (!bs) { |
720 | ret = -EINVAL; | |
721 | goto fail; | |
722 | } | |
723 | ||
724 | /* Create format layer */ | |
672de729 | 725 | ret = block_crypto_co_create_generic(bs, size, create_opts, prealloc, errp); |
1ec4f416 KW |
726 | if (ret < 0) { |
727 | goto fail; | |
728 | } | |
729 | ||
730 | ret = 0; | |
731 | fail: | |
1bba30da DHB |
732 | /* |
733 | * If an error occurred, delete 'filename'. Even if the file existed | |
734 | * beforehand, it has been truncated and corrupted in the process. | |
735 | */ | |
a890f08e | 736 | if (ret) { |
4db7ba3b | 737 | bdrv_graph_co_rdlock(); |
a890f08e | 738 | bdrv_co_delete_file_noerr(bs); |
4db7ba3b | 739 | bdrv_graph_co_rdunlock(); |
1bba30da DHB |
740 | } |
741 | ||
b2ab5f54 | 742 | bdrv_co_unref(bs); |
1ec4f416 | 743 | qapi_free_QCryptoBlockCreateOptions(create_opts); |
cb3e7f08 | 744 | qobject_unref(cryptoopts); |
1ec4f416 | 745 | return ret; |
78368575 DB |
746 | } |
747 | ||
a00e70c0 | 748 | static int coroutine_fn GRAPH_RDLOCK |
3d47eb0a | 749 | block_crypto_co_get_info_luks(BlockDriverState *bs, BlockDriverInfo *bdi) |
c7c4cf49 DB |
750 | { |
751 | BlockDriverInfo subbdi; | |
752 | int ret; | |
753 | ||
3d47eb0a | 754 | ret = bdrv_co_get_info(bs->file->bs, &subbdi); |
c7c4cf49 DB |
755 | if (ret != 0) { |
756 | return ret; | |
757 | } | |
758 | ||
c7c4cf49 DB |
759 | bdi->cluster_size = subbdi.cluster_size; |
760 | ||
761 | return 0; | |
762 | } | |
763 | ||
764 | static ImageInfoSpecific * | |
1bf6e9ca | 765 | block_crypto_get_specific_info_luks(BlockDriverState *bs, Error **errp) |
c7c4cf49 DB |
766 | { |
767 | BlockCrypto *crypto = bs->opaque; | |
768 | ImageInfoSpecific *spec_info; | |
769 | QCryptoBlockInfo *info; | |
770 | ||
1bf6e9ca | 771 | info = qcrypto_block_get_info(crypto->block, errp); |
c7c4cf49 DB |
772 | if (!info) { |
773 | return NULL; | |
774 | } | |
1bf6e9ca | 775 | assert(info->format == Q_CRYPTO_BLOCK_FORMAT_LUKS); |
c7c4cf49 DB |
776 | |
777 | spec_info = g_new(ImageInfoSpecific, 1); | |
778 | spec_info->type = IMAGE_INFO_SPECIFIC_KIND_LUKS; | |
779 | spec_info->u.luks.data = g_new(QCryptoBlockInfoLUKS, 1); | |
780 | *spec_info->u.luks.data = info->u.luks; | |
781 | ||
782 | /* Blank out pointers we've just stolen to avoid double free */ | |
783 | memset(&info->u.luks, 0, sizeof(info->u.luks)); | |
784 | ||
785 | qapi_free_QCryptoBlockInfo(info); | |
786 | ||
787 | return spec_info; | |
788 | } | |
789 | ||
3804e3cf | 790 | static int GRAPH_RDLOCK |
c1019d16 EGE |
791 | block_crypto_amend_prepare(BlockDriverState *bs, Error **errp) |
792 | { | |
793 | BlockCrypto *crypto = bs->opaque; | |
794 | int ret; | |
795 | ||
796 | /* apply for exclusive read/write permissions to the underlying file */ | |
797 | crypto->updating_keys = true; | |
798 | ret = bdrv_child_refresh_perms(bs, bs->file, errp); | |
799 | if (ret < 0) { | |
800 | /* Well, in this case we will not be updating any keys */ | |
801 | crypto->updating_keys = false; | |
802 | } | |
803 | return ret; | |
804 | } | |
805 | ||
3804e3cf | 806 | static void GRAPH_RDLOCK |
c1019d16 EGE |
807 | block_crypto_amend_cleanup(BlockDriverState *bs) |
808 | { | |
809 | BlockCrypto *crypto = bs->opaque; | |
810 | Error *errp = NULL; | |
811 | ||
812 | /* release exclusive read/write permissions to the underlying file */ | |
813 | crypto->updating_keys = false; | |
814 | bdrv_child_refresh_perms(bs, bs->file, &errp); | |
815 | ||
816 | if (errp) { | |
817 | error_report_err(errp); | |
818 | } | |
819 | } | |
820 | ||
bbfdae91 | 821 | static int |
30da9dd8 ML |
822 | block_crypto_amend_options_generic_luks(BlockDriverState *bs, |
823 | QCryptoBlockAmendOptions *amend_options, | |
824 | bool force, | |
825 | Error **errp) | |
bbfdae91 ML |
826 | { |
827 | BlockCrypto *crypto = bs->opaque; | |
bbfdae91 ML |
828 | |
829 | assert(crypto); | |
830 | assert(crypto->block); | |
bbfdae91 | 831 | |
dae84929 EGE |
832 | return qcrypto_block_amend_options(crypto->block, |
833 | block_crypto_read_func, | |
834 | block_crypto_write_func, | |
835 | bs, | |
836 | amend_options, | |
837 | force, | |
838 | errp); | |
30da9dd8 ML |
839 | } |
840 | ||
bd131d67 | 841 | static int GRAPH_RDLOCK |
30da9dd8 ML |
842 | block_crypto_amend_options_luks(BlockDriverState *bs, |
843 | QemuOpts *opts, | |
844 | BlockDriverAmendStatusCB *status_cb, | |
845 | void *cb_opaque, | |
846 | bool force, | |
847 | Error **errp) | |
848 | { | |
849 | BlockCrypto *crypto = bs->opaque; | |
850 | QDict *cryptoopts = NULL; | |
851 | QCryptoBlockAmendOptions *amend_options = NULL; | |
852 | int ret = -EINVAL; | |
853 | ||
854 | assert(crypto); | |
855 | assert(crypto->block); | |
856 | ||
857 | cryptoopts = qemu_opts_to_qdict(opts, NULL); | |
858 | qdict_put_str(cryptoopts, "format", "luks"); | |
859 | amend_options = block_crypto_amend_opts_init(cryptoopts, errp); | |
bbfdae91 | 860 | qobject_unref(cryptoopts); |
30da9dd8 ML |
861 | if (!amend_options) { |
862 | goto cleanup; | |
863 | } | |
dae84929 EGE |
864 | |
865 | ret = block_crypto_amend_prepare(bs, errp); | |
866 | if (ret) { | |
867 | goto perm_cleanup; | |
868 | } | |
30da9dd8 ML |
869 | ret = block_crypto_amend_options_generic_luks(bs, amend_options, |
870 | force, errp); | |
dae84929 EGE |
871 | |
872 | perm_cleanup: | |
873 | block_crypto_amend_cleanup(bs); | |
30da9dd8 ML |
874 | cleanup: |
875 | qapi_free_QCryptoBlockAmendOptions(amend_options); | |
bbfdae91 ML |
876 | return ret; |
877 | } | |
878 | ||
30da9dd8 ML |
879 | static int |
880 | coroutine_fn block_crypto_co_amend_luks(BlockDriverState *bs, | |
881 | BlockdevAmendOptions *opts, | |
882 | bool force, | |
883 | Error **errp) | |
884 | { | |
885 | QCryptoBlockAmendOptions amend_opts; | |
886 | ||
887 | amend_opts = (QCryptoBlockAmendOptions) { | |
888 | .format = Q_CRYPTO_BLOCK_FORMAT_LUKS, | |
889 | .u.luks = *qapi_BlockdevAmendOptionsLUKS_base(&opts->u.luks), | |
890 | }; | |
891 | return block_crypto_amend_options_generic_luks(bs, &amend_opts, | |
892 | force, errp); | |
893 | } | |
bbfdae91 ML |
894 | |
895 | static void | |
896 | block_crypto_child_perms(BlockDriverState *bs, BdrvChild *c, | |
897 | const BdrvChildRole role, | |
898 | BlockReopenQueue *reopen_queue, | |
899 | uint64_t perm, uint64_t shared, | |
900 | uint64_t *nperm, uint64_t *nshared) | |
901 | { | |
902 | ||
903 | BlockCrypto *crypto = bs->opaque; | |
904 | ||
905 | bdrv_default_perms(bs, c, role, reopen_queue, perm, shared, nperm, nshared); | |
906 | ||
907 | /* | |
908 | * For backward compatibility, manually share the write | |
909 | * and resize permission | |
910 | */ | |
662d0c53 | 911 | *nshared |= shared & (BLK_PERM_WRITE | BLK_PERM_RESIZE); |
bbfdae91 ML |
912 | /* |
913 | * Since we are not fully a format driver, don't always request | |
914 | * the read/resize permission but only when explicitly | |
915 | * requested | |
916 | */ | |
917 | *nperm &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); | |
918 | *nperm |= perm & (BLK_PERM_WRITE | BLK_PERM_RESIZE); | |
919 | ||
920 | /* | |
921 | * This driver doesn't modify LUKS metadata except | |
922 | * when updating the encryption slots. | |
923 | * Thus unlike a proper format driver we don't ask for | |
924 | * shared write/read permission. However we need it | |
925 | * when we are updating the keys, to ensure that only we | |
926 | * have access to the device. | |
927 | * | |
928 | * Encryption update will set the crypto->updating_keys | |
929 | * during that period and refresh permissions | |
930 | * | |
931 | */ | |
932 | if (crypto->updating_keys) { | |
933 | /* need exclusive write access for header update */ | |
934 | *nperm |= BLK_PERM_WRITE; | |
935 | /* unshare read and write permission */ | |
936 | *nshared &= ~(BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE); | |
937 | } | |
938 | } | |
939 | ||
940 | ||
2654267c HR |
941 | static const char *const block_crypto_strong_runtime_opts[] = { |
942 | BLOCK_CRYPTO_OPT_LUKS_KEY_SECRET, | |
943 | ||
944 | NULL | |
945 | }; | |
946 | ||
782b9d06 | 947 | static BlockDriver bdrv_crypto_luks = { |
78368575 DB |
948 | .format_name = "luks", |
949 | .instance_size = sizeof(BlockCrypto), | |
950 | .bdrv_probe = block_crypto_probe_luks, | |
951 | .bdrv_open = block_crypto_open_luks, | |
952 | .bdrv_close = block_crypto_close, | |
bbfdae91 | 953 | .bdrv_child_perm = block_crypto_child_perms, |
1bedcaf1 | 954 | .bdrv_co_create = block_crypto_co_create_luks, |
efc75e2a | 955 | .bdrv_co_create_opts = block_crypto_co_create_opts_luks, |
061ca8a3 | 956 | .bdrv_co_truncate = block_crypto_co_truncate, |
78368575 | 957 | .create_opts = &block_crypto_create_opts_luks, |
bbfdae91 | 958 | .amend_opts = &block_crypto_amend_opts_luks, |
78368575 | 959 | |
f87e08f9 | 960 | .bdrv_reopen_prepare = block_crypto_reopen_prepare, |
a73466fb DB |
961 | .bdrv_refresh_limits = block_crypto_refresh_limits, |
962 | .bdrv_co_preadv = block_crypto_co_preadv, | |
963 | .bdrv_co_pwritev = block_crypto_co_pwritev, | |
c86422c5 | 964 | .bdrv_co_getlength = block_crypto_co_getlength, |
a9da6e49 | 965 | .bdrv_measure = block_crypto_measure, |
3d47eb0a | 966 | .bdrv_co_get_info = block_crypto_co_get_info_luks, |
c7c4cf49 | 967 | .bdrv_get_specific_info = block_crypto_get_specific_info_luks, |
bbfdae91 | 968 | .bdrv_amend_options = block_crypto_amend_options_luks, |
30da9dd8 | 969 | .bdrv_co_amend = block_crypto_co_amend_luks, |
c1019d16 EGE |
970 | .bdrv_amend_pre_run = block_crypto_amend_prepare, |
971 | .bdrv_amend_clean = block_crypto_amend_cleanup, | |
2654267c | 972 | |
d67066d8 HR |
973 | .is_format = true, |
974 | ||
2654267c | 975 | .strong_runtime_opts = block_crypto_strong_runtime_opts, |
78368575 DB |
976 | }; |
977 | ||
978 | static void block_crypto_init(void) | |
979 | { | |
980 | bdrv_register(&bdrv_crypto_luks); | |
981 | } | |
982 | ||
983 | block_init(block_crypto_init); |