crypto: add support for querying parameters for block encryption

When creating new block encryption volumes, we accept a list of
parameters to control the formatting process. It is useful to
be able to query what those parameters were for existing block
devices. Add a qcrypto_block_get_info() method which returns a
QCryptoBlockInfo instance to report this data.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 1469192015-16487-2-git-send-email-berrange@redhat.com
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>

3 files changed, 88 insertions, 0 deletions

diff --git a/crypto/block-luks.c b/crypto/block-luks.c
index fcf3b04..aba4455 100644
--- a/crypto/block-luks.c
+++ b/crypto/block-luks.c
@@ -201,6 +201,15 @@ QEMU_BUILD_BUG_ON(sizeof(struct QCryptoBlockLUKSHeader) != 592);
 
 struct QCryptoBlockLUKS {
     QCryptoBlockLUKSHeader header;
+
+    /* Cache parsed versions of what's in header fields,
+     * as we can't rely on QCryptoBlock.cipher being
+     * non-NULL */
+    QCryptoCipherAlgorithm cipher_alg;
+    QCryptoCipherMode cipher_mode;
+    QCryptoIVGenAlgorithm ivgen_alg;
+    QCryptoHashAlgorithm ivgen_hash_alg;
+    QCryptoHashAlgorithm hash_alg;
 };
 
 
@@ -847,6 +856,12 @@ qcrypto_block_luks_open(QCryptoBlock *block,
     block->payload_offset = luks->header.payload_offset *
         QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
 
+    luks->cipher_alg = cipheralg;
+    luks->cipher_mode = ciphermode;
+    luks->ivgen_alg = ivalg;
+    luks->ivgen_hash_alg = ivhash;
+    luks->hash_alg = hash;
+
     g_free(masterkey);
     g_free(password);
 
@@ -1271,6 +1286,12 @@ qcrypto_block_luks_create(QCryptoBlock *block,
         goto error;
     }
 
+    luks->cipher_alg = luks_opts.cipher_alg;
+    luks->cipher_mode = luks_opts.cipher_mode;
+    luks->ivgen_alg = luks_opts.ivgen_alg;
+    luks->ivgen_hash_alg = luks_opts.ivgen_hash_alg;
+    luks->hash_alg = luks_opts.hash_alg;
+
     memset(masterkey, 0, luks->header.key_bytes);
     g_free(masterkey);
     memset(slotkey, 0, luks->header.key_bytes);
@@ -1305,6 +1326,51 @@ qcrypto_block_luks_create(QCryptoBlock *block,
 }
 
 
+static int qcrypto_block_luks_get_info(QCryptoBlock *block,
+                                       QCryptoBlockInfo *info,
+                                       Error **errp)
+{
+    QCryptoBlockLUKS *luks = block->opaque;
+    QCryptoBlockInfoLUKSSlot *slot;
+    QCryptoBlockInfoLUKSSlotList *slots = NULL, **prev = &info->u.luks.slots;
+    size_t i;
+
+    info->u.luks.cipher_alg = luks->cipher_alg;
+    info->u.luks.cipher_mode = luks->cipher_mode;
+    info->u.luks.ivgen_alg = luks->ivgen_alg;
+    if (info->u.luks.ivgen_alg == QCRYPTO_IVGEN_ALG_ESSIV) {
+        info->u.luks.has_ivgen_hash_alg = true;
+        info->u.luks.ivgen_hash_alg = luks->ivgen_hash_alg;
+    }
+    info->u.luks.hash_alg = luks->hash_alg;
+    info->u.luks.payload_offset = block->payload_offset;
+    info->u.luks.master_key_iters = luks->header.master_key_iterations;
+    info->u.luks.uuid = g_strndup((const char *)luks->header.uuid,
+                                  sizeof(luks->header.uuid));
+
+    for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
+        slots = g_new0(QCryptoBlockInfoLUKSSlotList, 1);
+        *prev = slots;
+
+        slots->value = slot = g_new0(QCryptoBlockInfoLUKSSlot, 1);
+        slot->active = luks->header.key_slots[i].active ==
+            QCRYPTO_BLOCK_LUKS_KEY_SLOT_ENABLED;
+        slot->key_offset = luks->header.key_slots[i].key_offset
+             * QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
+        if (slot->active) {
+            slot->has_iters = true;
+            slot->iters = luks->header.key_slots[i].iterations;
+            slot->has_stripes = true;
+            slot->stripes = luks->header.key_slots[i].stripes;
+        }
+
+        prev = &slots->next;
+    }
+
+    return 0;
+}
+
+
 static void qcrypto_block_luks_cleanup(QCryptoBlock *block)
 {
     g_free(block->opaque);
@@ -1342,6 +1408,7 @@ qcrypto_block_luks_encrypt(QCryptoBlock *block,
 const QCryptoBlockDriver qcrypto_block_driver_luks = {
     .open = qcrypto_block_luks_open,
     .create = qcrypto_block_luks_create,
+    .get_info = qcrypto_block_luks_get_info,
     .cleanup = qcrypto_block_luks_cleanup,
     .decrypt = qcrypto_block_luks_decrypt,
     .encrypt = qcrypto_block_luks_encrypt,
diff --git a/crypto/block.c b/crypto/block.c
index da60eba..be823ee 100644
--- a/crypto/block.c
+++ b/crypto/block.c
@@ -105,6 +105,23 @@ QCryptoBlock *qcrypto_block_create(QCryptoBlockCreateOptions *options,
 }
 
 
+QCryptoBlockInfo *qcrypto_block_get_info(QCryptoBlock *block,
+                                         Error **errp)
+{
+    QCryptoBlockInfo *info = g_new0(QCryptoBlockInfo, 1);
+
+    info->format = block->format;
+
+    if (block->driver->get_info &&
+        block->driver->get_info(block, info, errp) < 0) {
+        g_free(info);
+        return NULL;
+    }
+
+    return info;
+}
+
+
 int qcrypto_block_decrypt(QCryptoBlock *block,
                           uint64_t startsector,
                           uint8_t *buf,
diff --git a/crypto/blockpriv.h b/crypto/blockpriv.h
index 15b547d..68f0f06 100644
--- a/crypto/blockpriv.h
+++ b/crypto/blockpriv.h
@@ -53,6 +53,10 @@ struct QCryptoBlockDriver {
                   void *opaque,
                   Error **errp);
 
+    int (*get_info)(QCryptoBlock *block,
+                    QCryptoBlockInfo *info,
+                    Error **errp);
+
     void (*cleanup)(QCryptoBlock *block);
 
     int (*encrypt)(QCryptoBlock *block,