+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2005 W. Michael Petullo <mike@flyn.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+#include <asm/types.h>
+
+#include "volume_id.h"
+#include "util.h"
+#include "logging.h"
+#include "luks.h"
+
+/* from cryptsetup-luks internal.h */
+#define SECTOR_SHIFT 9
+#define SECTOR_SIZE (1 << SECTOR_SHIFT)
+
+/* from cryptsetup-luks luks.h */
+#define LUKS_CIPHERNAME_L 32
+#define LUKS_CIPHERMODE_L 32
+#define LUKS_HASHSPEC_L 32
+#define LUKS_DIGESTSIZE 20 /* since SHA1 */
+#define LUKS_SALTSIZE 32
+#define LUKS_NUMKEYS 8
+
+/* from cryptsetup-luks luks.h */
+const unsigned char LUKS_MAGIC[] = {'L','U','K','S', 0xba, 0xbe};
+#define LUKS_MAGIC_L 6
+
+/* from cryptsetup-luks luks.h */
+#define LUKS_PHDR_SIZE (sizeof(struct luks_phdr)/SECTOR_SIZE+1)
+
+/* from cryptsetup-luks luks.h */
+#define UUID_STRING_L 40
+
+int volume_id_probe_luks(struct volume_id *id, __u64 off)
+{
+ /* from cryptsetup-luks luks.h */
+ struct luks_phdr {
+ char magic[LUKS_MAGIC_L];
+ uint16_t version;
+ char cipherName[LUKS_CIPHERNAME_L];
+ char cipherMode[LUKS_CIPHERMODE_L];
+ char hashSpec[LUKS_HASHSPEC_L];
+ uint32_t payloadOffset;
+ uint32_t keyBytes;
+ char mkDigest[LUKS_DIGESTSIZE];
+ char mkDigestSalt[LUKS_SALTSIZE];
+ uint32_t mkDigestIterations;
+ char uuid[UUID_STRING_L];
+ struct {
+ uint32_t active;
+
+ /* parameters used for password processing */
+ uint32_t passwordIterations;
+ char passwordSalt[LUKS_SALTSIZE];
+
+ /* parameters used for AF store/load */
+ uint32_t keyMaterialOffset;
+ uint32_t stripes;
+ } keyblock[LUKS_NUMKEYS];
+ } *header;
+
+ header = (struct luks_phdr*) volume_id_get_buffer(id, off, LUKS_PHDR_SIZE);
+
+ if (header == NULL)
+ return -1;
+
+ if (memcmp(header->magic, LUKS_MAGIC, LUKS_MAGIC_L))
+ return -1;
+
+ volume_id_set_usage(id, VOLUME_ID_CRYPTO);
+ volume_id_set_uuid(id, header->uuid, UUID_DCE);
+ id->type = "crypto_LUKS";
+
+ return 0;
+}
~ianmdlvl / elogind.git / commitdiff