Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 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" |
| 24 | #include "sysemu/block-backend.h" |
| 25 | #include "crypto/block.h" |
| 26 | #include "qapi/opts-visitor.h" |
| 27 | #include "qapi-visit.h" |
| 28 | #include "qapi/error.h" |
| 29 | |
| 30 | #define BLOCK_CRYPTO_OPT_LUKS_KEY_SECRET "key-secret" |
| 31 | #define BLOCK_CRYPTO_OPT_LUKS_CIPHER_ALG "cipher-alg" |
| 32 | #define BLOCK_CRYPTO_OPT_LUKS_CIPHER_MODE "cipher-mode" |
| 33 | #define BLOCK_CRYPTO_OPT_LUKS_IVGEN_ALG "ivgen-alg" |
| 34 | #define BLOCK_CRYPTO_OPT_LUKS_IVGEN_HASH_ALG "ivgen-hash-alg" |
| 35 | #define BLOCK_CRYPTO_OPT_LUKS_HASH_ALG "hash-alg" |
Daniel P. Berrange | 3bd1889 | 2016-09-06 18:43:00 +0100 | [diff] [blame] | 36 | #define BLOCK_CRYPTO_OPT_LUKS_ITER_TIME "iter-time" |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 37 | |
| 38 | typedef struct BlockCrypto BlockCrypto; |
| 39 | |
| 40 | struct BlockCrypto { |
| 41 | QCryptoBlock *block; |
| 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 | |
| 58 | static ssize_t block_crypto_read_func(QCryptoBlock *block, |
Fam Zheng | 3750923 | 2017-04-21 20:27:02 +0800 | [diff] [blame] | 59 | void *opaque, |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 60 | size_t offset, |
| 61 | uint8_t *buf, |
| 62 | size_t buflen, |
Fam Zheng | 3750923 | 2017-04-21 20:27:02 +0800 | [diff] [blame] | 63 | Error **errp) |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 64 | { |
| 65 | BlockDriverState *bs = opaque; |
| 66 | ssize_t ret; |
| 67 | |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 68 | ret = bdrv_pread(bs->file, offset, buf, buflen); |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 69 | if (ret < 0) { |
| 70 | error_setg_errno(errp, -ret, "Could not read encryption header"); |
| 71 | return ret; |
| 72 | } |
| 73 | return ret; |
| 74 | } |
| 75 | |
| 76 | |
| 77 | struct BlockCryptoCreateData { |
| 78 | const char *filename; |
| 79 | QemuOpts *opts; |
| 80 | BlockBackend *blk; |
| 81 | uint64_t size; |
| 82 | }; |
| 83 | |
| 84 | |
| 85 | static ssize_t block_crypto_write_func(QCryptoBlock *block, |
Fam Zheng | 3750923 | 2017-04-21 20:27:02 +0800 | [diff] [blame] | 86 | void *opaque, |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 87 | size_t offset, |
| 88 | const uint8_t *buf, |
| 89 | size_t buflen, |
Fam Zheng | 3750923 | 2017-04-21 20:27:02 +0800 | [diff] [blame] | 90 | Error **errp) |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 91 | { |
| 92 | struct BlockCryptoCreateData *data = opaque; |
| 93 | ssize_t ret; |
| 94 | |
Eric Blake | 8341f00 | 2016-05-06 10:26:27 -0600 | [diff] [blame] | 95 | ret = blk_pwrite(data->blk, offset, buf, buflen, 0); |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 96 | if (ret < 0) { |
| 97 | error_setg_errno(errp, -ret, "Could not write encryption header"); |
| 98 | return ret; |
| 99 | } |
| 100 | return ret; |
| 101 | } |
| 102 | |
| 103 | |
| 104 | static ssize_t block_crypto_init_func(QCryptoBlock *block, |
Fam Zheng | 3750923 | 2017-04-21 20:27:02 +0800 | [diff] [blame] | 105 | void *opaque, |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 106 | size_t headerlen, |
Fam Zheng | 3750923 | 2017-04-21 20:27:02 +0800 | [diff] [blame] | 107 | Error **errp) |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 108 | { |
| 109 | struct BlockCryptoCreateData *data = opaque; |
| 110 | int ret; |
| 111 | |
| 112 | /* User provided size should reflect amount of space made |
| 113 | * available to the guest, so we must take account of that |
| 114 | * which will be used by the crypto header |
| 115 | */ |
| 116 | data->size += headerlen; |
| 117 | |
| 118 | qemu_opt_set_number(data->opts, BLOCK_OPT_SIZE, data->size, &error_abort); |
| 119 | ret = bdrv_create_file(data->filename, data->opts, errp); |
| 120 | if (ret < 0) { |
| 121 | return -1; |
| 122 | } |
| 123 | |
| 124 | data->blk = blk_new_open(data->filename, NULL, NULL, |
Kevin Wolf | 72e775c | 2016-03-15 14:34:37 +0100 | [diff] [blame] | 125 | BDRV_O_RDWR | BDRV_O_PROTOCOL, errp); |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 126 | if (!data->blk) { |
| 127 | return -1; |
| 128 | } |
| 129 | |
| 130 | return 0; |
| 131 | } |
| 132 | |
| 133 | |
| 134 | static QemuOptsList block_crypto_runtime_opts_luks = { |
| 135 | .name = "crypto", |
| 136 | .head = QTAILQ_HEAD_INITIALIZER(block_crypto_runtime_opts_luks.head), |
| 137 | .desc = { |
| 138 | { |
| 139 | .name = BLOCK_CRYPTO_OPT_LUKS_KEY_SECRET, |
| 140 | .type = QEMU_OPT_STRING, |
| 141 | .help = "ID of the secret that provides the encryption key", |
| 142 | }, |
| 143 | { /* end of list */ } |
| 144 | }, |
| 145 | }; |
| 146 | |
| 147 | |
| 148 | static QemuOptsList block_crypto_create_opts_luks = { |
| 149 | .name = "crypto", |
| 150 | .head = QTAILQ_HEAD_INITIALIZER(block_crypto_create_opts_luks.head), |
| 151 | .desc = { |
| 152 | { |
| 153 | .name = BLOCK_OPT_SIZE, |
| 154 | .type = QEMU_OPT_SIZE, |
| 155 | .help = "Virtual disk size" |
| 156 | }, |
| 157 | { |
| 158 | .name = BLOCK_CRYPTO_OPT_LUKS_KEY_SECRET, |
| 159 | .type = QEMU_OPT_STRING, |
| 160 | .help = "ID of the secret that provides the encryption key", |
| 161 | }, |
| 162 | { |
| 163 | .name = BLOCK_CRYPTO_OPT_LUKS_CIPHER_ALG, |
| 164 | .type = QEMU_OPT_STRING, |
| 165 | .help = "Name of encryption cipher algorithm", |
| 166 | }, |
| 167 | { |
| 168 | .name = BLOCK_CRYPTO_OPT_LUKS_CIPHER_MODE, |
| 169 | .type = QEMU_OPT_STRING, |
| 170 | .help = "Name of encryption cipher mode", |
| 171 | }, |
| 172 | { |
| 173 | .name = BLOCK_CRYPTO_OPT_LUKS_IVGEN_ALG, |
| 174 | .type = QEMU_OPT_STRING, |
| 175 | .help = "Name of IV generator algorithm", |
| 176 | }, |
| 177 | { |
| 178 | .name = BLOCK_CRYPTO_OPT_LUKS_IVGEN_HASH_ALG, |
| 179 | .type = QEMU_OPT_STRING, |
| 180 | .help = "Name of IV generator hash algorithm", |
| 181 | }, |
| 182 | { |
| 183 | .name = BLOCK_CRYPTO_OPT_LUKS_HASH_ALG, |
| 184 | .type = QEMU_OPT_STRING, |
| 185 | .help = "Name of encryption hash algorithm", |
| 186 | }, |
Daniel P. Berrange | 3bd1889 | 2016-09-06 18:43:00 +0100 | [diff] [blame] | 187 | { |
| 188 | .name = BLOCK_CRYPTO_OPT_LUKS_ITER_TIME, |
| 189 | .type = QEMU_OPT_NUMBER, |
| 190 | .help = "Time to spend in PBKDF in milliseconds", |
| 191 | }, |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 192 | { /* end of list */ } |
| 193 | }, |
| 194 | }; |
| 195 | |
| 196 | |
| 197 | static QCryptoBlockOpenOptions * |
| 198 | block_crypto_open_opts_init(QCryptoBlockFormat format, |
| 199 | QemuOpts *opts, |
| 200 | Error **errp) |
| 201 | { |
Eric Blake | 09204ea | 2016-06-09 10:48:36 -0600 | [diff] [blame] | 202 | Visitor *v; |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 203 | QCryptoBlockOpenOptions *ret = NULL; |
| 204 | Error *local_err = NULL; |
| 205 | |
| 206 | ret = g_new0(QCryptoBlockOpenOptions, 1); |
| 207 | ret->format = format; |
| 208 | |
Eric Blake | 09204ea | 2016-06-09 10:48:36 -0600 | [diff] [blame] | 209 | v = opts_visitor_new(opts); |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 210 | |
Eric Blake | 09204ea | 2016-06-09 10:48:36 -0600 | [diff] [blame] | 211 | visit_start_struct(v, NULL, NULL, 0, &local_err); |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 212 | if (local_err) { |
| 213 | goto out; |
| 214 | } |
| 215 | |
| 216 | switch (format) { |
| 217 | case Q_CRYPTO_BLOCK_FORMAT_LUKS: |
| 218 | visit_type_QCryptoBlockOptionsLUKS_members( |
Eric Blake | 09204ea | 2016-06-09 10:48:36 -0600 | [diff] [blame] | 219 | v, &ret->u.luks, &local_err); |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 220 | break; |
| 221 | |
| 222 | default: |
| 223 | error_setg(&local_err, "Unsupported block format %d", format); |
| 224 | break; |
| 225 | } |
Eric Blake | 15c2f66 | 2016-04-28 15:45:27 -0600 | [diff] [blame] | 226 | if (!local_err) { |
Eric Blake | 09204ea | 2016-06-09 10:48:36 -0600 | [diff] [blame] | 227 | visit_check_struct(v, &local_err); |
Eric Blake | 15c2f66 | 2016-04-28 15:45:27 -0600 | [diff] [blame] | 228 | } |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 229 | |
Eric Blake | 09204ea | 2016-06-09 10:48:36 -0600 | [diff] [blame] | 230 | visit_end_struct(v, NULL); |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 231 | |
| 232 | out: |
| 233 | if (local_err) { |
| 234 | error_propagate(errp, local_err); |
| 235 | qapi_free_QCryptoBlockOpenOptions(ret); |
| 236 | ret = NULL; |
| 237 | } |
Eric Blake | 09204ea | 2016-06-09 10:48:36 -0600 | [diff] [blame] | 238 | visit_free(v); |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 239 | return ret; |
| 240 | } |
| 241 | |
| 242 | |
| 243 | static QCryptoBlockCreateOptions * |
| 244 | block_crypto_create_opts_init(QCryptoBlockFormat format, |
| 245 | QemuOpts *opts, |
| 246 | Error **errp) |
| 247 | { |
Eric Blake | 09204ea | 2016-06-09 10:48:36 -0600 | [diff] [blame] | 248 | Visitor *v; |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 249 | QCryptoBlockCreateOptions *ret = NULL; |
| 250 | Error *local_err = NULL; |
| 251 | |
| 252 | ret = g_new0(QCryptoBlockCreateOptions, 1); |
| 253 | ret->format = format; |
| 254 | |
Eric Blake | 09204ea | 2016-06-09 10:48:36 -0600 | [diff] [blame] | 255 | v = opts_visitor_new(opts); |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 256 | |
Eric Blake | 09204ea | 2016-06-09 10:48:36 -0600 | [diff] [blame] | 257 | visit_start_struct(v, NULL, NULL, 0, &local_err); |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 258 | if (local_err) { |
| 259 | goto out; |
| 260 | } |
| 261 | |
| 262 | switch (format) { |
| 263 | case Q_CRYPTO_BLOCK_FORMAT_LUKS: |
| 264 | visit_type_QCryptoBlockCreateOptionsLUKS_members( |
Eric Blake | 09204ea | 2016-06-09 10:48:36 -0600 | [diff] [blame] | 265 | v, &ret->u.luks, &local_err); |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 266 | break; |
| 267 | |
| 268 | default: |
| 269 | error_setg(&local_err, "Unsupported block format %d", format); |
| 270 | break; |
| 271 | } |
Eric Blake | 15c2f66 | 2016-04-28 15:45:27 -0600 | [diff] [blame] | 272 | if (!local_err) { |
Eric Blake | 09204ea | 2016-06-09 10:48:36 -0600 | [diff] [blame] | 273 | visit_check_struct(v, &local_err); |
Eric Blake | 15c2f66 | 2016-04-28 15:45:27 -0600 | [diff] [blame] | 274 | } |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 275 | |
Eric Blake | 09204ea | 2016-06-09 10:48:36 -0600 | [diff] [blame] | 276 | visit_end_struct(v, NULL); |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 277 | |
| 278 | out: |
| 279 | if (local_err) { |
| 280 | error_propagate(errp, local_err); |
| 281 | qapi_free_QCryptoBlockCreateOptions(ret); |
| 282 | ret = NULL; |
| 283 | } |
Eric Blake | 09204ea | 2016-06-09 10:48:36 -0600 | [diff] [blame] | 284 | visit_free(v); |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 285 | return ret; |
| 286 | } |
| 287 | |
| 288 | |
| 289 | static int block_crypto_open_generic(QCryptoBlockFormat format, |
| 290 | QemuOptsList *opts_spec, |
| 291 | BlockDriverState *bs, |
| 292 | QDict *options, |
| 293 | int flags, |
| 294 | Error **errp) |
| 295 | { |
| 296 | BlockCrypto *crypto = bs->opaque; |
| 297 | QemuOpts *opts = NULL; |
| 298 | Error *local_err = NULL; |
| 299 | int ret = -EINVAL; |
| 300 | QCryptoBlockOpenOptions *open_opts = NULL; |
| 301 | unsigned int cflags = 0; |
| 302 | |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 303 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, |
| 304 | false, errp); |
| 305 | if (!bs->file) { |
| 306 | return -EINVAL; |
| 307 | } |
| 308 | |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 309 | opts = qemu_opts_create(opts_spec, NULL, 0, &error_abort); |
| 310 | qemu_opts_absorb_qdict(opts, options, &local_err); |
| 311 | if (local_err) { |
| 312 | error_propagate(errp, local_err); |
| 313 | goto cleanup; |
| 314 | } |
| 315 | |
| 316 | open_opts = block_crypto_open_opts_init(format, opts, errp); |
| 317 | if (!open_opts) { |
| 318 | goto cleanup; |
| 319 | } |
| 320 | |
| 321 | if (flags & BDRV_O_NO_IO) { |
| 322 | cflags |= QCRYPTO_BLOCK_OPEN_NO_IO; |
| 323 | } |
| 324 | crypto->block = qcrypto_block_open(open_opts, |
| 325 | block_crypto_read_func, |
| 326 | bs, |
| 327 | cflags, |
| 328 | errp); |
| 329 | |
| 330 | if (!crypto->block) { |
| 331 | ret = -EIO; |
| 332 | goto cleanup; |
| 333 | } |
| 334 | |
Eric Blake | 5411541 | 2016-06-23 16:37:26 -0600 | [diff] [blame] | 335 | bs->encrypted = true; |
| 336 | bs->valid_key = true; |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 337 | |
| 338 | ret = 0; |
| 339 | cleanup: |
| 340 | qapi_free_QCryptoBlockOpenOptions(open_opts); |
| 341 | return ret; |
| 342 | } |
| 343 | |
| 344 | |
| 345 | static int block_crypto_create_generic(QCryptoBlockFormat format, |
| 346 | const char *filename, |
| 347 | QemuOpts *opts, |
| 348 | Error **errp) |
| 349 | { |
| 350 | int ret = -EINVAL; |
| 351 | QCryptoBlockCreateOptions *create_opts = NULL; |
| 352 | QCryptoBlock *crypto = NULL; |
| 353 | struct BlockCryptoCreateData data = { |
| 354 | .size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), |
| 355 | BDRV_SECTOR_SIZE), |
| 356 | .opts = opts, |
| 357 | .filename = filename, |
| 358 | }; |
| 359 | |
| 360 | create_opts = block_crypto_create_opts_init(format, opts, errp); |
| 361 | if (!create_opts) { |
| 362 | return -1; |
| 363 | } |
| 364 | |
| 365 | crypto = qcrypto_block_create(create_opts, |
| 366 | block_crypto_init_func, |
| 367 | block_crypto_write_func, |
| 368 | &data, |
| 369 | errp); |
| 370 | |
| 371 | if (!crypto) { |
| 372 | ret = -EIO; |
| 373 | goto cleanup; |
| 374 | } |
| 375 | |
| 376 | ret = 0; |
| 377 | cleanup: |
| 378 | qcrypto_block_free(crypto); |
| 379 | blk_unref(data.blk); |
| 380 | qapi_free_QCryptoBlockCreateOptions(create_opts); |
| 381 | return ret; |
| 382 | } |
| 383 | |
Max Reitz | 4bff28b | 2017-03-28 22:51:28 +0200 | [diff] [blame] | 384 | static int block_crypto_truncate(BlockDriverState *bs, int64_t offset, |
| 385 | Error **errp) |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 386 | { |
| 387 | BlockCrypto *crypto = bs->opaque; |
| 388 | size_t payload_offset = |
| 389 | qcrypto_block_get_payload_offset(crypto->block); |
| 390 | |
| 391 | offset += payload_offset; |
| 392 | |
Max Reitz | 4bff28b | 2017-03-28 22:51:28 +0200 | [diff] [blame] | 393 | return bdrv_truncate(bs->file, offset, errp); |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 394 | } |
| 395 | |
| 396 | static void block_crypto_close(BlockDriverState *bs) |
| 397 | { |
| 398 | BlockCrypto *crypto = bs->opaque; |
| 399 | qcrypto_block_free(crypto->block); |
| 400 | } |
| 401 | |
| 402 | |
| 403 | #define BLOCK_CRYPTO_MAX_SECTORS 32 |
| 404 | |
| 405 | static coroutine_fn int |
| 406 | block_crypto_co_readv(BlockDriverState *bs, int64_t sector_num, |
| 407 | int remaining_sectors, QEMUIOVector *qiov) |
| 408 | { |
| 409 | BlockCrypto *crypto = bs->opaque; |
| 410 | int cur_nr_sectors; /* number of sectors in current iteration */ |
| 411 | uint64_t bytes_done = 0; |
| 412 | uint8_t *cipher_data = NULL; |
| 413 | QEMUIOVector hd_qiov; |
| 414 | int ret = 0; |
| 415 | size_t payload_offset = |
| 416 | qcrypto_block_get_payload_offset(crypto->block) / 512; |
| 417 | |
| 418 | qemu_iovec_init(&hd_qiov, qiov->niov); |
| 419 | |
| 420 | /* Bounce buffer so we have a linear mem region for |
| 421 | * entire sector. XXX optimize so we avoid bounce |
| 422 | * buffer in case that qiov->niov == 1 |
| 423 | */ |
| 424 | cipher_data = |
| 425 | qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_SECTORS * 512, |
| 426 | qiov->size)); |
| 427 | if (cipher_data == NULL) { |
| 428 | ret = -ENOMEM; |
| 429 | goto cleanup; |
| 430 | } |
| 431 | |
| 432 | while (remaining_sectors) { |
| 433 | cur_nr_sectors = remaining_sectors; |
| 434 | |
| 435 | if (cur_nr_sectors > BLOCK_CRYPTO_MAX_SECTORS) { |
| 436 | cur_nr_sectors = BLOCK_CRYPTO_MAX_SECTORS; |
| 437 | } |
| 438 | |
| 439 | qemu_iovec_reset(&hd_qiov); |
| 440 | qemu_iovec_add(&hd_qiov, cipher_data, cur_nr_sectors * 512); |
| 441 | |
Kevin Wolf | 28b04a8 | 2016-05-24 17:21:22 +0200 | [diff] [blame] | 442 | ret = bdrv_co_readv(bs->file, |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 443 | payload_offset + sector_num, |
| 444 | cur_nr_sectors, &hd_qiov); |
| 445 | if (ret < 0) { |
| 446 | goto cleanup; |
| 447 | } |
| 448 | |
| 449 | if (qcrypto_block_decrypt(crypto->block, |
| 450 | sector_num, |
| 451 | cipher_data, cur_nr_sectors * 512, |
| 452 | NULL) < 0) { |
| 453 | ret = -EIO; |
| 454 | goto cleanup; |
| 455 | } |
| 456 | |
| 457 | qemu_iovec_from_buf(qiov, bytes_done, |
| 458 | cipher_data, cur_nr_sectors * 512); |
| 459 | |
| 460 | remaining_sectors -= cur_nr_sectors; |
| 461 | sector_num += cur_nr_sectors; |
| 462 | bytes_done += cur_nr_sectors * 512; |
| 463 | } |
| 464 | |
| 465 | cleanup: |
| 466 | qemu_iovec_destroy(&hd_qiov); |
| 467 | qemu_vfree(cipher_data); |
| 468 | |
| 469 | return ret; |
| 470 | } |
| 471 | |
| 472 | |
| 473 | static coroutine_fn int |
| 474 | block_crypto_co_writev(BlockDriverState *bs, int64_t sector_num, |
| 475 | int remaining_sectors, QEMUIOVector *qiov) |
| 476 | { |
| 477 | BlockCrypto *crypto = bs->opaque; |
| 478 | int cur_nr_sectors; /* number of sectors in current iteration */ |
| 479 | uint64_t bytes_done = 0; |
| 480 | uint8_t *cipher_data = NULL; |
| 481 | QEMUIOVector hd_qiov; |
| 482 | int ret = 0; |
| 483 | size_t payload_offset = |
| 484 | qcrypto_block_get_payload_offset(crypto->block) / 512; |
| 485 | |
| 486 | qemu_iovec_init(&hd_qiov, qiov->niov); |
| 487 | |
| 488 | /* Bounce buffer so we have a linear mem region for |
| 489 | * entire sector. XXX optimize so we avoid bounce |
| 490 | * buffer in case that qiov->niov == 1 |
| 491 | */ |
| 492 | cipher_data = |
| 493 | qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_SECTORS * 512, |
| 494 | qiov->size)); |
| 495 | if (cipher_data == NULL) { |
| 496 | ret = -ENOMEM; |
| 497 | goto cleanup; |
| 498 | } |
| 499 | |
| 500 | while (remaining_sectors) { |
| 501 | cur_nr_sectors = remaining_sectors; |
| 502 | |
| 503 | if (cur_nr_sectors > BLOCK_CRYPTO_MAX_SECTORS) { |
| 504 | cur_nr_sectors = BLOCK_CRYPTO_MAX_SECTORS; |
| 505 | } |
| 506 | |
| 507 | qemu_iovec_to_buf(qiov, bytes_done, |
| 508 | cipher_data, cur_nr_sectors * 512); |
| 509 | |
| 510 | if (qcrypto_block_encrypt(crypto->block, |
| 511 | sector_num, |
| 512 | cipher_data, cur_nr_sectors * 512, |
| 513 | NULL) < 0) { |
| 514 | ret = -EIO; |
| 515 | goto cleanup; |
| 516 | } |
| 517 | |
| 518 | qemu_iovec_reset(&hd_qiov); |
| 519 | qemu_iovec_add(&hd_qiov, cipher_data, cur_nr_sectors * 512); |
| 520 | |
Kevin Wolf | 25ec177 | 2016-05-24 17:21:22 +0200 | [diff] [blame] | 521 | ret = bdrv_co_writev(bs->file, |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 522 | payload_offset + sector_num, |
| 523 | cur_nr_sectors, &hd_qiov); |
| 524 | if (ret < 0) { |
| 525 | goto cleanup; |
| 526 | } |
| 527 | |
| 528 | remaining_sectors -= cur_nr_sectors; |
| 529 | sector_num += cur_nr_sectors; |
| 530 | bytes_done += cur_nr_sectors * 512; |
| 531 | } |
| 532 | |
| 533 | cleanup: |
| 534 | qemu_iovec_destroy(&hd_qiov); |
| 535 | qemu_vfree(cipher_data); |
| 536 | |
| 537 | return ret; |
| 538 | } |
| 539 | |
| 540 | |
| 541 | static int64_t block_crypto_getlength(BlockDriverState *bs) |
| 542 | { |
| 543 | BlockCrypto *crypto = bs->opaque; |
| 544 | int64_t len = bdrv_getlength(bs->file->bs); |
| 545 | |
| 546 | ssize_t offset = qcrypto_block_get_payload_offset(crypto->block); |
| 547 | |
| 548 | len -= offset; |
| 549 | |
| 550 | return len; |
| 551 | } |
| 552 | |
| 553 | |
| 554 | static int block_crypto_probe_luks(const uint8_t *buf, |
| 555 | int buf_size, |
| 556 | const char *filename) { |
| 557 | return block_crypto_probe_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS, |
| 558 | buf, buf_size, filename); |
| 559 | } |
| 560 | |
| 561 | static int block_crypto_open_luks(BlockDriverState *bs, |
| 562 | QDict *options, |
| 563 | int flags, |
| 564 | Error **errp) |
| 565 | { |
| 566 | return block_crypto_open_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS, |
| 567 | &block_crypto_runtime_opts_luks, |
| 568 | bs, options, flags, errp); |
| 569 | } |
| 570 | |
| 571 | static int block_crypto_create_luks(const char *filename, |
| 572 | QemuOpts *opts, |
| 573 | Error **errp) |
| 574 | { |
| 575 | return block_crypto_create_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS, |
| 576 | filename, opts, errp); |
| 577 | } |
| 578 | |
Daniel P. Berrange | c7c4cf4 | 2016-07-22 13:53:35 +0100 | [diff] [blame] | 579 | static int block_crypto_get_info_luks(BlockDriverState *bs, |
| 580 | BlockDriverInfo *bdi) |
| 581 | { |
| 582 | BlockDriverInfo subbdi; |
| 583 | int ret; |
| 584 | |
| 585 | ret = bdrv_get_info(bs->file->bs, &subbdi); |
| 586 | if (ret != 0) { |
| 587 | return ret; |
| 588 | } |
| 589 | |
| 590 | bdi->unallocated_blocks_are_zero = false; |
| 591 | bdi->can_write_zeroes_with_unmap = false; |
| 592 | bdi->cluster_size = subbdi.cluster_size; |
| 593 | |
| 594 | return 0; |
| 595 | } |
| 596 | |
| 597 | static ImageInfoSpecific * |
| 598 | block_crypto_get_specific_info_luks(BlockDriverState *bs) |
| 599 | { |
| 600 | BlockCrypto *crypto = bs->opaque; |
| 601 | ImageInfoSpecific *spec_info; |
| 602 | QCryptoBlockInfo *info; |
| 603 | |
| 604 | info = qcrypto_block_get_info(crypto->block, NULL); |
| 605 | if (!info) { |
| 606 | return NULL; |
| 607 | } |
| 608 | if (info->format != Q_CRYPTO_BLOCK_FORMAT_LUKS) { |
| 609 | qapi_free_QCryptoBlockInfo(info); |
| 610 | return NULL; |
| 611 | } |
| 612 | |
| 613 | spec_info = g_new(ImageInfoSpecific, 1); |
| 614 | spec_info->type = IMAGE_INFO_SPECIFIC_KIND_LUKS; |
| 615 | spec_info->u.luks.data = g_new(QCryptoBlockInfoLUKS, 1); |
| 616 | *spec_info->u.luks.data = info->u.luks; |
| 617 | |
| 618 | /* Blank out pointers we've just stolen to avoid double free */ |
| 619 | memset(&info->u.luks, 0, sizeof(info->u.luks)); |
| 620 | |
| 621 | qapi_free_QCryptoBlockInfo(info); |
| 622 | |
| 623 | return spec_info; |
| 624 | } |
| 625 | |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 626 | BlockDriver bdrv_crypto_luks = { |
| 627 | .format_name = "luks", |
| 628 | .instance_size = sizeof(BlockCrypto), |
| 629 | .bdrv_probe = block_crypto_probe_luks, |
| 630 | .bdrv_open = block_crypto_open_luks, |
| 631 | .bdrv_close = block_crypto_close, |
Kevin Wolf | 862f215 | 2016-12-19 16:36:02 +0100 | [diff] [blame] | 632 | .bdrv_child_perm = bdrv_format_default_perms, |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 633 | .bdrv_create = block_crypto_create_luks, |
| 634 | .bdrv_truncate = block_crypto_truncate, |
| 635 | .create_opts = &block_crypto_create_opts_luks, |
| 636 | |
| 637 | .bdrv_co_readv = block_crypto_co_readv, |
| 638 | .bdrv_co_writev = block_crypto_co_writev, |
| 639 | .bdrv_getlength = block_crypto_getlength, |
Daniel P. Berrange | c7c4cf4 | 2016-07-22 13:53:35 +0100 | [diff] [blame] | 640 | .bdrv_get_info = block_crypto_get_info_luks, |
| 641 | .bdrv_get_specific_info = block_crypto_get_specific_info_luks, |
Daniel P. Berrange | 7836857 | 2016-03-21 14:11:47 +0000 | [diff] [blame] | 642 | }; |
| 643 | |
| 644 | static void block_crypto_init(void) |
| 645 | { |
| 646 | bdrv_register(&bdrv_crypto_luks); |
| 647 | } |
| 648 | |
| 649 | block_init(block_crypto_init); |