crypto: implement the LUKS block encryption format

Provide a block encryption implementation that follows the
LUKS/dm-crypt specification.

This supports all combinations of hash, cipher algorithm,
cipher mode and iv generator that are implemented by the
current crypto layer.

There is support for opening existing volumes formatted
by dm-crypt, and for formatting new volumes. In the latter
case it will only use key slot 0.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

1 files changed, 125 insertions, 2 deletions

diff --git a/tests/test-crypto-block.c b/tests/test-crypto-block.c
index 3f65383..cdbe09d 100644
--- a/tests/test-crypto-block.c
+++ b/tests/test-crypto-block.c
@@ -23,6 +23,15 @@
 #include "crypto/block.h"
 #include "qemu/buffer.h"
 #include "crypto/secret.h"
+#ifndef _WIN32
+#include <sys/resource.h>
+#endif
+
+#if defined(CONFIG_UUID) && (defined(_WIN32) || defined RUSAGE_THREAD)
+#define TEST_LUKS
+#else
+#undef TEST_LUKS
+#endif
 
 static QCryptoBlockCreateOptions qcow_create_opts = {
     .format = Q_CRYPTO_BLOCK_FORMAT_QCOW,
@@ -40,6 +49,63 @@ static QCryptoBlockOpenOptions qcow_open_opts = {
     },
 };
 
+
+#ifdef TEST_LUKS
+static QCryptoBlockOpenOptions luks_open_opts = {
+    .format = Q_CRYPTO_BLOCK_FORMAT_LUKS,
+    .u.luks = {
+        .has_key_secret = true,
+        .key_secret = (char *)"sec0",
+    },
+};
+
+
+/* Creation with all default values */
+static QCryptoBlockCreateOptions luks_create_opts_default = {
+    .format = Q_CRYPTO_BLOCK_FORMAT_LUKS,
+    .u.luks = {
+        .has_key_secret = true,
+        .key_secret = (char *)"sec0",
+    },
+};
+
+
+/* ...and with explicit values */
+static QCryptoBlockCreateOptions luks_create_opts_aes256_cbc_plain64 = {
+    .format = Q_CRYPTO_BLOCK_FORMAT_LUKS,
+    .u.luks = {
+        .has_key_secret = true,
+        .key_secret = (char *)"sec0",
+        .has_cipher_alg = true,
+        .cipher_alg = QCRYPTO_CIPHER_ALG_AES_256,
+        .has_cipher_mode = true,
+        .cipher_mode = QCRYPTO_CIPHER_MODE_CBC,
+        .has_ivgen_alg = true,
+        .ivgen_alg = QCRYPTO_IVGEN_ALG_PLAIN64,
+    },
+};
+
+
+static QCryptoBlockCreateOptions luks_create_opts_aes256_cbc_essiv = {
+    .format = Q_CRYPTO_BLOCK_FORMAT_LUKS,
+    .u.luks = {
+        .has_key_secret = true,
+        .key_secret = (char *)"sec0",
+        .has_cipher_alg = true,
+        .cipher_alg = QCRYPTO_CIPHER_ALG_AES_256,
+        .has_cipher_mode = true,
+        .cipher_mode = QCRYPTO_CIPHER_MODE_CBC,
+        .has_ivgen_alg = true,
+        .ivgen_alg = QCRYPTO_IVGEN_ALG_ESSIV,
+        .has_ivgen_hash_alg = true,
+        .ivgen_hash_alg = QCRYPTO_HASH_ALG_SHA256,
+        .has_hash_alg = true,
+        .hash_alg = QCRYPTO_HASH_ALG_SHA1,
+    },
+};
+#endif /* TEST_LUKS */
+
+
 static struct QCryptoBlockTestData {
     const char *path;
     QCryptoBlockCreateOptions *create_opts;
@@ -52,7 +118,9 @@ static struct QCryptoBlockTestData {
     QCryptoHashAlgorithm hash_alg;
 
     QCryptoIVGenAlgorithm ivgen_alg;
-    QCryptoCipherAlgorithm ivgen_hash;
+    QCryptoHashAlgorithm ivgen_hash;
+
+    bool slow;
 } test_data[] = {
     {
         .path = "/crypto/block/qcow",
@@ -66,6 +134,54 @@ static struct QCryptoBlockTestData {
 
         .ivgen_alg = QCRYPTO_IVGEN_ALG_PLAIN64,
     },
+#ifdef TEST_LUKS
+    {
+        .path = "/crypto/block/luks/default",
+        .create_opts = &luks_create_opts_default,
+        .open_opts = &luks_open_opts,
+
+        .expect_header = true,
+
+        .cipher_alg = QCRYPTO_CIPHER_ALG_AES_256,
+        .cipher_mode = QCRYPTO_CIPHER_MODE_XTS,
+        .hash_alg = QCRYPTO_HASH_ALG_SHA256,
+
+        .ivgen_alg = QCRYPTO_IVGEN_ALG_PLAIN64,
+
+        .slow = true,
+    },
+    {
+        .path = "/crypto/block/luks/aes-256-cbc-plain64",
+        .create_opts = &luks_create_opts_aes256_cbc_plain64,
+        .open_opts = &luks_open_opts,
+
+        .expect_header = true,
+
+        .cipher_alg = QCRYPTO_CIPHER_ALG_AES_256,
+        .cipher_mode = QCRYPTO_CIPHER_MODE_CBC,
+        .hash_alg = QCRYPTO_HASH_ALG_SHA256,
+
+        .ivgen_alg = QCRYPTO_IVGEN_ALG_PLAIN64,
+
+        .slow = true,
+    },
+    {
+        .path = "/crypto/block/luks/aes-256-cbc-essiv",
+        .create_opts = &luks_create_opts_aes256_cbc_essiv,
+        .open_opts = &luks_open_opts,
+
+        .expect_header = true,
+
+        .cipher_alg = QCRYPTO_CIPHER_ALG_AES_256,
+        .cipher_mode = QCRYPTO_CIPHER_MODE_CBC,
+        .hash_alg = QCRYPTO_HASH_ALG_SHA1,
+
+        .ivgen_alg = QCRYPTO_IVGEN_ALG_ESSIV,
+        .ivgen_hash = QCRYPTO_HASH_ALG_SHA256,
+
+        .slow = true,
+    },
+#endif
 };
 
 
@@ -232,7 +348,14 @@ int main(int argc, char **argv)
     g_assert(qcrypto_init(NULL) == 0);
 
     for (i = 0; i < G_N_ELEMENTS(test_data); i++) {
-        g_test_add_data_func(test_data[i].path, &test_data[i], test_block);
+        if (test_data[i].open_opts->format == Q_CRYPTO_BLOCK_FORMAT_LUKS &&
+            !qcrypto_hash_supports(test_data[i].hash_alg)) {
+            continue;
+        }
+        if (!test_data[i].slow ||
+            g_test_slow()) {
+            g_test_add_data_func(test_data[i].path, &test_data[i], test_block);
+        }
     }
 
     return g_test_run();