#include "qemu/bswap.h"
#include <zlib.h>
#include "qapi/qmp/qerror.h"
-#include "crypto/cipher.h"
+#include "qapi/qmp/qstring.h"
+#include "crypto/block.h"
#include "migration/blocker.h"
+#include "block/crypto.h"
/**************************************************************/
/* QEMU COW block driver with compression and encryption support */
uint8_t *cluster_cache;
uint8_t *cluster_data;
uint64_t cluster_cache_offset;
- QCryptoCipher *cipher; /* NULL if no key yet */
+ QCryptoBlock *crypto; /* Disk encryption format driver */
uint32_t crypt_method_header;
CoMutex lock;
Error *migration_blocker;
return 0;
}
+static QemuOptsList qcow_runtime_opts = {
+ .name = "qcow",
+ .head = QTAILQ_HEAD_INITIALIZER(qcow_runtime_opts.head),
+ .desc = {
+ BLOCK_CRYPTO_OPT_DEF_QCOW_KEY_SECRET("encrypt."),
+ { /* end of list */ }
+ },
+};
+
static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
int ret;
QCowHeader header;
Error *local_err = NULL;
+ QCryptoBlockOpenOptions *crypto_opts = NULL;
+ unsigned int cflags = 0;
+ QDict *encryptopts = NULL;
+ const char *encryptfmt;
+
+ qdict_extract_subqdict(options, &encryptopts, "encrypt.");
+ encryptfmt = qdict_get_try_str(encryptopts, "format");
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
- return -EINVAL;
+ ret = -EINVAL;
+ goto fail;
}
ret = bdrv_pread(bs->file, 0, &header, sizeof(header));
goto fail;
}
- if (header.crypt_method > QCOW_CRYPT_AES) {
- error_setg(errp, "invalid encryption method in qcow header");
- ret = -EINVAL;
- goto fail;
- }
- if (!qcrypto_cipher_supports(QCRYPTO_CIPHER_ALG_AES_128,
- QCRYPTO_CIPHER_MODE_CBC)) {
- error_setg(errp, "AES cipher not available");
- ret = -EINVAL;
- goto fail;
- }
s->crypt_method_header = header.crypt_method;
if (s->crypt_method_header) {
if (bdrv_uses_whitelist() &&
ret = -ENOSYS;
goto fail;
}
+ if (s->crypt_method_header == QCOW_CRYPT_AES) {
+ if (encryptfmt && !g_str_equal(encryptfmt, "aes")) {
+ error_setg(errp,
+ "Header reported 'aes' encryption format but "
+ "options specify '%s'", encryptfmt);
+ ret = -EINVAL;
+ goto fail;
+ }
+ qdict_del(encryptopts, "format");
+ crypto_opts = block_crypto_open_opts_init(
+ Q_CRYPTO_BLOCK_FORMAT_QCOW, encryptopts, errp);
+ if (!crypto_opts) {
+ ret = -EINVAL;
+ goto fail;
+ }
+ if (flags & BDRV_O_NO_IO) {
+ cflags |= QCRYPTO_BLOCK_OPEN_NO_IO;
+ }
+ s->crypto = qcrypto_block_open(crypto_opts, NULL, NULL,
+ cflags, errp);
+ if (!s->crypto) {
+ ret = -EINVAL;
+ goto fail;
+ }
+ } else {
+ error_setg(errp, "invalid encryption method in qcow header");
+ ret = -EINVAL;
+ goto fail;
+ }
bs->encrypted = true;
+ bs->valid_key = true;
}
s->cluster_bits = header.cluster_bits;
s->cluster_size = 1 << s->cluster_bits;
goto fail;
}
+ QDECREF(encryptopts);
+ qapi_free_QCryptoBlockOpenOptions(crypto_opts);
qemu_co_mutex_init(&s->lock);
return 0;
qemu_vfree(s->l2_cache);
g_free(s->cluster_cache);
g_free(s->cluster_data);
+ qcrypto_block_free(s->crypto);
+ QDECREF(encryptopts);
+ qapi_free_QCryptoBlockOpenOptions(crypto_opts);
return ret;
}
return 0;
}
-static int qcow_set_key(BlockDriverState *bs, const char *key)
-{
- BDRVQcowState *s = bs->opaque;
- uint8_t keybuf[16];
- int len, i;
- Error *err;
-
- memset(keybuf, 0, 16);
- len = strlen(key);
- if (len > 16)
- len = 16;
- /* XXX: we could compress the chars to 7 bits to increase
- entropy */
- for(i = 0;i < len;i++) {
- keybuf[i] = key[i];
- }
- assert(bs->encrypted);
-
- qcrypto_cipher_free(s->cipher);
- s->cipher = qcrypto_cipher_new(
- QCRYPTO_CIPHER_ALG_AES_128,
- QCRYPTO_CIPHER_MODE_CBC,
- keybuf, G_N_ELEMENTS(keybuf),
- &err);
-
- if (!s->cipher) {
- /* XXX would be nice if errors in this method could
- * be properly propagate to the caller. Would need
- * the bdrv_set_key() API signature to be fixed. */
- error_free(err);
- return -1;
- }
- return 0;
-}
-
-/* The crypt function is compatible with the linux cryptoloop
- algorithm for < 4 GB images. */
-static int encrypt_sectors(BDRVQcowState *s, int64_t sector_num,
- uint8_t *buf, int nb_sectors, bool enc,
- Error **errp)
-{
- union {
- uint64_t ll[2];
- uint8_t b[16];
- } ivec;
- int i;
- int ret;
-
- for(i = 0; i < nb_sectors; i++) {
- ivec.ll[0] = cpu_to_le64(sector_num);
- ivec.ll[1] = 0;
- if (qcrypto_cipher_setiv(s->cipher,
- ivec.b, G_N_ELEMENTS(ivec.b),
- errp) < 0) {
- return -1;
- }
- if (enc) {
- ret = qcrypto_cipher_encrypt(s->cipher,
- buf, buf,
- 512,
- errp);
- } else {
- ret = qcrypto_cipher_decrypt(s->cipher,
- buf, buf,
- 512,
- errp);
- }
- if (ret < 0) {
- return -1;
- }
- sector_num++;
- buf += 512;
- }
- return 0;
-}
/* 'allocate' is:
*
if (bs->encrypted &&
(n_end - n_start) < s->cluster_sectors) {
uint64_t start_sect;
- assert(s->cipher);
+ assert(s->crypto);
start_sect = (offset & ~(s->cluster_size - 1)) >> 9;
for(i = 0; i < s->cluster_sectors; i++) {
if (i < n_start || i >= n_end) {
Error *err = NULL;
memset(s->cluster_data, 0x00, 512);
- if (encrypt_sectors(s, start_sect + i,
- s->cluster_data, 1,
- true, &err) < 0) {
+ if (qcrypto_block_encrypt(s->crypto, start_sect + i,
+ s->cluster_data,
+ BDRV_SECTOR_SIZE,
+ &err) < 0) {
error_free(err);
errno = EIO;
return -1;
if (!cluster_offset) {
return 0;
}
- if ((cluster_offset & QCOW_OFLAG_COMPRESSED) || s->cipher) {
+ if ((cluster_offset & QCOW_OFLAG_COMPRESSED) || s->crypto) {
return BDRV_BLOCK_DATA;
}
cluster_offset |= (index_in_cluster << BDRV_SECTOR_BITS);
break;
}
if (bs->encrypted) {
- assert(s->cipher);
- if (encrypt_sectors(s, sector_num, buf,
- n, false, &err) < 0) {
+ assert(s->crypto);
+ if (qcrypto_block_decrypt(s->crypto, sector_num, buf,
+ n * BDRV_SECTOR_SIZE, &err) < 0) {
goto fail;
}
}
}
if (bs->encrypted) {
Error *err = NULL;
- assert(s->cipher);
- if (encrypt_sectors(s, sector_num, buf, n, true, &err) < 0) {
+ assert(s->crypto);
+ if (qcrypto_block_encrypt(s->crypto, sector_num, buf,
+ n * BDRV_SECTOR_SIZE, &err) < 0) {
error_free(err);
ret = -EIO;
break;
{
BDRVQcowState *s = bs->opaque;
- qcrypto_cipher_free(s->cipher);
- s->cipher = NULL;
+ qcrypto_block_free(s->crypto);
+ s->crypto = NULL;
g_free(s->l1_table);
qemu_vfree(s->l2_cache);
g_free(s->cluster_cache);
int ret;
BlockBackend *qcow_blk;
const char *encryptfmt = NULL;
+ QDict *options;
+ QDict *encryptopts = NULL;
+ QCryptoBlockCreateOptions *crypto_opts = NULL;
+ QCryptoBlock *crypto = NULL;
/* Read out options */
total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
l1_size = (total_size + (1LL << shift) - 1) >> shift;
header.l1_table_offset = cpu_to_be64(header_size);
+
+ options = qemu_opts_to_qdict(opts, NULL);
+ qdict_extract_subqdict(options, &encryptopts, "encrypt.");
+ QDECREF(options);
if (encryptfmt) {
if (!g_str_equal(encryptfmt, "aes")) {
error_setg(errp, "Unknown encryption format '%s', expected 'aes'",
goto exit;
}
header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES);
+
+ crypto_opts = block_crypto_create_opts_init(
+ Q_CRYPTO_BLOCK_FORMAT_QCOW, encryptopts, errp);
+ if (!crypto_opts) {
+ ret = -EINVAL;
+ goto exit;
+ }
+
+ crypto = qcrypto_block_create(crypto_opts, NULL, NULL, NULL, errp);
+ if (!crypto) {
+ ret = -EINVAL;
+ goto exit;
+ }
} else {
header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE);
}
exit:
blk_unref(qcow_blk);
cleanup:
+ QDECREF(encryptopts);
+ qcrypto_block_free(crypto);
+ qapi_free_QCryptoBlockCreateOptions(crypto_opts);
g_free(backing_file);
return ret;
}
.type = QEMU_OPT_STRING,
.help = "Encrypt the image, format choices: 'aes'",
},
+ BLOCK_CRYPTO_OPT_DEF_QCOW_KEY_SECRET("encrypt."),
{ /* end of list */ }
}
};
.bdrv_co_writev = qcow_co_writev,
.bdrv_co_get_block_status = qcow_co_get_block_status,
- .bdrv_set_key = qcow_set_key,
.bdrv_make_empty = qcow_make_empty,
.bdrv_co_pwritev_compressed = qcow_co_pwritev_compressed,
.bdrv_get_info = qcow_get_info,
projects / qemu.git / commitdiff