Adding upstream version 2.38.1.upstream/2.38.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 191 insertions, 0 deletions

diff --git a/libblkid/src/superblocks/bitlocker.c b/libblkid/src/superblocks/bitlocker.c
new file mode 100644
index 0000000..111edf3
--- /dev/null
+++ b/libblkid/src/superblocks/bitlocker.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright (C) 2018 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+#include <stdint.h>
+
+#include "superblocks.h"
+
+#define BDE_HDR_SIZE	512
+#define BDE_HDR_OFFSET	0
+
+struct bde_header_win7 {
+/*   0 */ unsigned char	boot_entry_point[3];
+/*   3 */ unsigned char	fs_signature[8];
+/*  11 */ unsigned char	__dummy1[67 - 11];
+/*  67 */ uint32_t      volume_serial;		/* NTFS uses 64bit serial number */
+/*  71 */ unsigned char volume_label[11];	/* "NO NAME\x20\x20\x20\x20" only */
+/*  82 */ unsigned char __dummy2[160 - 82];
+/* 160 */ unsigned char guid[16];		/* BitLocker specific GUID */
+/* 176 */ uint64_t      fve_metadata_offset;
+} __attribute__((packed));
+
+
+struct bde_header_togo {
+/*   0 */ unsigned char	boot_entry_point[3];
+/*   3 */ unsigned char	fs_signature[8];
+/*  11 */ unsigned char	__dummy[424 - 11];
+/* 424 */ unsigned char guid[16];
+/* 440 */ uint64_t      fve_metadata_offset;
+} __attribute__((packed));
+
+
+struct bde_fve_metadata {
+/*   0 */ unsigned char  signature[8];
+/*   8 */ uint16_t       size;
+/*  10 */ uint16_t       version;
+};
+
+enum {
+	BDE_VERSION_VISTA = 0,
+	BDE_VERSION_WIN7,
+	BDE_VERSION_TOGO
+};
+
+#define BDE_MAGIC_VISTA		"\xeb\x52\x90-FVE-FS-"
+#define BDE_MAGIC_WIN7		"\xeb\x58\x90-FVE-FS-"
+#define BDE_MAGIC_TOGO		"\xeb\x58\x90MSWIN4.1"
+
+#define BDE_MAGIC_FVE		"-FVE-FS-"
+
+static int get_bitlocker_type(const unsigned char *buf)
+{
+	size_t i;
+	static const char *map[] = {
+		[BDE_VERSION_VISTA] = BDE_MAGIC_VISTA,
+		[BDE_VERSION_WIN7]  = BDE_MAGIC_WIN7,
+		[BDE_VERSION_TOGO]  = BDE_MAGIC_TOGO
+	};
+
+	for (i = 0; i < ARRAY_SIZE(map); i++) {
+		if (memcmp(buf, map[i], 11) == 0)
+			return (int) i;
+	}
+
+	return -1;
+}
+
+/* Returns: < 0 error, 1 nothing, 0 success
+ */
+static int get_bitlocker_headers(blkid_probe pr,
+				int *type,
+				const unsigned char **buf_hdr,
+				const unsigned char **buf_fve)
+{
+
+	const unsigned char *buf;
+	const struct bde_fve_metadata *fve;
+	uint64_t off = 0;
+	int kind;
+
+	if (buf_hdr)
+		*buf_hdr = NULL;
+	if (buf_fve)
+		*buf_fve = NULL;
+	if (type)
+		*type = -1;
+
+	buf = blkid_probe_get_buffer(pr, BDE_HDR_OFFSET, BDE_HDR_SIZE);
+	if (!buf)
+		return errno ? -errno : 1;
+
+	kind = get_bitlocker_type(buf);
+
+	/* Check BitLocker header */
+	switch (kind) {
+	case BDE_VERSION_WIN7:
+		off = le64_to_cpu(((const struct bde_header_win7 *) buf)->fve_metadata_offset);
+		break;
+	case BDE_VERSION_TOGO:
+		off = le64_to_cpu(((const struct bde_header_togo *) buf)->fve_metadata_offset);
+		break;
+	case BDE_VERSION_VISTA:
+		goto done;
+	default:
+		goto nothing;
+	}
+
+	if (!off)
+		goto nothing;
+	if (buf_hdr)
+		*buf_hdr = buf;
+
+	/* Check Bitlocker FVE metadata header */
+	buf = blkid_probe_get_buffer(pr, off, sizeof(struct bde_fve_metadata));
+	if (!buf)
+		return errno ? -errno : 1;
+
+	fve = (const struct bde_fve_metadata *) buf;
+	if (memcmp(fve->signature, BDE_MAGIC_FVE, sizeof(fve->signature)) != 0)
+		goto nothing;
+	if (buf_fve)
+		*buf_fve = buf;
+done:
+	if (type)
+		*type = kind;
+	return 0;
+nothing:
+	return 1;
+}
+
+/*
+ * This is used by vFAT and NTFS prober to avoid collisions with bitlocker.
+ */
+int blkid_probe_is_bitlocker(blkid_probe pr)
+{
+	return get_bitlocker_headers(pr, NULL, NULL, NULL) == 0;
+}
+
+static int probe_bitlocker(blkid_probe pr,
+		const struct blkid_idmag *mag __attribute__((__unused__)))
+{
+	const unsigned char *buf_fve = NULL;
+	const unsigned char *buf_hdr = NULL;
+	int rc, kind;
+
+	rc = get_bitlocker_headers(pr, &kind, &buf_hdr, &buf_fve);
+	if (rc)
+		return rc;
+
+	if (kind == BDE_VERSION_WIN7) {
+		const struct bde_header_win7 *hdr = (const struct bde_header_win7 *) buf_hdr;
+
+		/* Unfortunately, it seems volume_serial is always zero */
+		blkid_probe_sprintf_uuid(pr,
+				(const unsigned char *) &hdr->volume_serial,
+				sizeof(hdr->volume_serial),
+				"%016d", le32_to_cpu(hdr->volume_serial));
+	}
+
+	if (buf_fve) {
+		const struct bde_fve_metadata *fve = (const struct bde_fve_metadata *) buf_fve;
+
+		blkid_probe_sprintf_version(pr, "%d", fve->version);
+	}
+	return 0;
+}
+
+/* See header details:
+ * https://github.com/libyal/libbde/blob/master/documentation/BitLocker%20Drive%20Encryption%20(BDE)%20format.asciidoc
+ */
+const struct blkid_idinfo bitlocker_idinfo =
+{
+	.name		= "BitLocker",
+	.usage		= BLKID_USAGE_CRYPTO,
+	.probefunc	= probe_bitlocker,
+	.magics		=
+	{
+		{ .magic = BDE_MAGIC_VISTA, .len = 11 },
+		{ .magic = BDE_MAGIC_WIN7,  .len = 11 },
+		{ .magic = BDE_MAGIC_TOGO,  .len = 11 },
+		{ NULL }
+	}
+};