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-rw-r--r--crypto/block-luks.c155
1 files changed, 93 insertions, 62 deletions
diff --git a/crypto/block-luks.c b/crypto/block-luks.c
index b8f9b9c20a..47371edf13 100644
--- a/crypto/block-luks.c
+++ b/crypto/block-luks.c
@@ -410,6 +410,97 @@ qcrypto_block_luks_essiv_cipher(QCryptoCipherAlgorithm cipher,
}
/*
+ * Stores the main LUKS header, taking care of endianess
+ */
+static int
+qcrypto_block_luks_store_header(QCryptoBlock *block,
+ QCryptoBlockWriteFunc writefunc,
+ void *opaque,
+ Error **errp)
+{
+ const QCryptoBlockLUKS *luks = block->opaque;
+ Error *local_err = NULL;
+ size_t i;
+ g_autofree QCryptoBlockLUKSHeader *hdr_copy = NULL;
+
+ /* Create a copy of the header */
+ hdr_copy = g_new0(QCryptoBlockLUKSHeader, 1);
+ memcpy(hdr_copy, &luks->header, sizeof(QCryptoBlockLUKSHeader));
+
+ /*
+ * Everything on disk uses Big Endian (tm), so flip header fields
+ * before writing them
+ */
+ cpu_to_be16s(&hdr_copy->version);
+ cpu_to_be32s(&hdr_copy->payload_offset_sector);
+ cpu_to_be32s(&hdr_copy->master_key_len);
+ cpu_to_be32s(&hdr_copy->master_key_iterations);
+
+ for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
+ cpu_to_be32s(&hdr_copy->key_slots[i].active);
+ cpu_to_be32s(&hdr_copy->key_slots[i].iterations);
+ cpu_to_be32s(&hdr_copy->key_slots[i].key_offset_sector);
+ cpu_to_be32s(&hdr_copy->key_slots[i].stripes);
+ }
+
+ /* Write out the partition header and key slot headers */
+ writefunc(block, 0, (const uint8_t *)hdr_copy, sizeof(*hdr_copy),
+ opaque, &local_err);
+
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ * Loads the main LUKS header,and byteswaps it to native endianess
+ * And run basic sanity checks on it
+ */
+static int
+qcrypto_block_luks_load_header(QCryptoBlock *block,
+ QCryptoBlockReadFunc readfunc,
+ void *opaque,
+ Error **errp)
+{
+ ssize_t rv;
+ size_t i;
+ QCryptoBlockLUKS *luks = block->opaque;
+
+ /*
+ * Read the entire LUKS header, minus the key material from
+ * the underlying device
+ */
+ rv = readfunc(block, 0,
+ (uint8_t *)&luks->header,
+ sizeof(luks->header),
+ opaque,
+ errp);
+ if (rv < 0) {
+ return rv;
+ }
+
+ /*
+ * The header is always stored in big-endian format, so
+ * convert everything to native
+ */
+ be16_to_cpus(&luks->header.version);
+ be32_to_cpus(&luks->header.payload_offset_sector);
+ be32_to_cpus(&luks->header.master_key_len);
+ be32_to_cpus(&luks->header.master_key_iterations);
+
+ for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
+ be32_to_cpus(&luks->header.key_slots[i].active);
+ be32_to_cpus(&luks->header.key_slots[i].iterations);
+ be32_to_cpus(&luks->header.key_slots[i].key_offset_sector);
+ be32_to_cpus(&luks->header.key_slots[i].stripes);
+ }
+
+ return 0;
+}
+
+/*
* Given a key slot, and user password, this will attempt to unlock
* the master encryption key from the key slot.
*
@@ -622,7 +713,6 @@ qcrypto_block_luks_open(QCryptoBlock *block,
{
QCryptoBlockLUKS *luks = NULL;
Error *local_err = NULL;
- size_t i;
g_autofree uint8_t *masterkey = NULL;
char *ivgen_name, *ivhash_name;
g_autofree char *password = NULL;
@@ -644,30 +734,10 @@ qcrypto_block_luks_open(QCryptoBlock *block,
luks = g_new0(QCryptoBlockLUKS, 1);
block->opaque = luks;
- /* Read the entire LUKS header, minus the key material from
- * the underlying device */
- if (readfunc(block, 0,
- (uint8_t *)&luks->header,
- sizeof(luks->header),
- opaque,
- errp) < 0) {
+ if (qcrypto_block_luks_load_header(block, readfunc, opaque, errp) < 0) {
goto fail;
}
- /* The header is always stored in big-endian format, so
- * convert everything to native */
- be16_to_cpus(&luks->header.version);
- be32_to_cpus(&luks->header.payload_offset_sector);
- be32_to_cpus(&luks->header.master_key_len);
- be32_to_cpus(&luks->header.master_key_iterations);
-
- for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
- be32_to_cpus(&luks->header.key_slots[i].active);
- be32_to_cpus(&luks->header.key_slots[i].iterations);
- be32_to_cpus(&luks->header.key_slots[i].key_offset_sector);
- be32_to_cpus(&luks->header.key_slots[i].stripes);
- }
-
if (memcmp(luks->header.magic, qcrypto_block_luks_magic,
QCRYPTO_BLOCK_LUKS_MAGIC_LEN) != 0) {
error_setg(errp, "Volume is not in LUKS format");
@@ -1216,46 +1286,7 @@ qcrypto_block_luks_create(QCryptoBlock *block,
goto error;
}
- /* Everything on disk uses Big Endian, so flip header fields
- * before writing them */
- cpu_to_be16s(&luks->header.version);
- cpu_to_be32s(&luks->header.payload_offset_sector);
- cpu_to_be32s(&luks->header.master_key_len);
- cpu_to_be32s(&luks->header.master_key_iterations);
-
- for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
- cpu_to_be32s(&luks->header.key_slots[i].active);
- cpu_to_be32s(&luks->header.key_slots[i].iterations);
- cpu_to_be32s(&luks->header.key_slots[i].key_offset_sector);
- cpu_to_be32s(&luks->header.key_slots[i].stripes);
- }
-
-
- /* Write out the partition header and key slot headers */
- writefunc(block, 0,
- (const uint8_t *)&luks->header,
- sizeof(luks->header),
- opaque,
- &local_err);
-
- /* Delay checking local_err until we've byte-swapped */
-
- /* Byte swap the header back to native, in case we need
- * to read it again later */
- be16_to_cpus(&luks->header.version);
- be32_to_cpus(&luks->header.payload_offset_sector);
- be32_to_cpus(&luks->header.master_key_len);
- be32_to_cpus(&luks->header.master_key_iterations);
-
- for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
- be32_to_cpus(&luks->header.key_slots[i].active);
- be32_to_cpus(&luks->header.key_slots[i].iterations);
- be32_to_cpus(&luks->header.key_slots[i].key_offset_sector);
- be32_to_cpus(&luks->header.key_slots[i].stripes);
- }
-
- if (local_err) {
- error_propagate(errp, local_err);
+ if (qcrypto_block_luks_store_header(block, writefunc, opaque, errp) < 0) {
goto error;
}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-20 03:48:57 +0000