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From 5c643ba894421ac78c3fe18ff9548d8e9fa82ed4 Mon Sep 17 00:00:00 2001
From: John Lane <john@lane.uk.net>
Date: Tue, 23 Jun 2015 11:16:30 +0100
Subject: [PATCH 1/5] Cryptomount support LUKS detached header
---
grub-core/disk/cryptodisk.c | 22 ++++++++++++++++++----
grub-core/disk/geli.c | 7 +++++--
grub-core/disk/luks.c | 45 +++++++++++++++++++++++++++++++++++++--------
include/grub/cryptodisk.h | 5 +++--
4 files changed, 63 insertions(+), 16 deletions(-)
diff --git a/grub-core/disk/cryptodisk.c b/grub-core/disk/cryptodisk.c
index 82a3dcb..6f596a0 100644
--- a/grub-core/disk/cryptodisk.c
+++ b/grub-core/disk/cryptodisk.c
@@ -40,6 +40,7 @@ static const struct grub_arg_option options[] =
/* TRANSLATORS: It's still restricted to cryptodisks only. */
{"all", 'a', 0, N_("Mount all."), 0, 0},
{"boot", 'b', 0, N_("Mount all volumes with `boot' flag set."), 0, 0},
+ {"header", 'H', 0, N_("Read LUKS header from file"), 0, ARG_TYPE_STRING},
{0, 0, 0, 0, 0, 0}
};
@@ -803,6 +804,7 @@ grub_util_cryptodisk_get_uuid (grub_disk_t disk)
static int check_boot, have_it;
static char *search_uuid;
+static grub_file_t hdr;
static void
cryptodisk_close (grub_cryptodisk_t dev)
@@ -827,13 +829,13 @@ grub_cryptodisk_scan_device_real (const char *name, grub_disk_t source)
FOR_CRYPTODISK_DEVS (cr)
{
- dev = cr->scan (source, search_uuid, check_boot);
+ dev = cr->scan (source, search_uuid, check_boot, hdr);
if (grub_errno)
return grub_errno;
if (!dev)
continue;
- err = cr->recover_key (source, dev);
+ err = cr->recover_key (source, dev, hdr);
if (err)
{
cryptodisk_close (dev);
@@ -874,7 +876,7 @@ grub_cryptodisk_cheat_mount (const char *sourcedev, const char *cheat)
FOR_CRYPTODISK_DEVS (cr)
{
- dev = cr->scan (source, search_uuid, check_boot);
+ dev = cr->scan (source, search_uuid, check_boot,0);
if (grub_errno)
return grub_errno;
if (!dev)
@@ -928,6 +930,18 @@ grub_cmd_cryptomount (grub_extcmd_context_t ctxt, int argc, char **args)
if (argc < 1 && !state[1].set && !state[2].set)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "device name required");
+ if (state[3].set) /* LUKS detached header */
+ {
+ if (state[0].set) /* Cannot use UUID lookup with detached header */
+ return GRUB_ERR_BAD_ARGUMENT;
+
+ hdr = grub_file_open (state[3].arg);
+ if (!hdr)
+ return grub_errno;
+ }
+ else
+ hdr = NULL;
+
have_it = 0;
if (state[0].set)
{
@@ -1125,7 +1139,7 @@ GRUB_MOD_INIT (cryptodisk)
{
grub_disk_dev_register (&grub_cryptodisk_dev);
cmd = grub_register_extcmd ("cryptomount", grub_cmd_cryptomount, 0,
- N_("SOURCE|-u UUID|-a|-b"),
+ N_("SOURCE|-u UUID|-a|-b|-H file"),
N_("Mount a crypto device."), options);
grub_procfs_register ("luks_script", &luks_script);
}
diff --git a/grub-core/disk/geli.c b/grub-core/disk/geli.c
index e9d2329..f4394eb 100644
--- a/grub-core/disk/geli.c
+++ b/grub-core/disk/geli.c
@@ -52,6 +52,7 @@
#include <grub/dl.h>
#include <grub/err.h>
#include <grub/disk.h>
+#include <grub/file.h>
#include <grub/crypto.h>
#include <grub/partition.h>
#include <grub/i18n.h>
@@ -243,7 +244,8 @@ grub_util_get_geli_uuid (const char *dev)
static grub_cryptodisk_t
configure_ciphers (grub_disk_t disk, const char *check_uuid,
- int boot_only)
+ int boot_only,
+ grub_file_t hdr __attribute__ ((unused)) )
{
grub_cryptodisk_t newdev;
struct grub_geli_phdr header;
@@ -398,7 +400,8 @@ configure_ciphers (grub_disk_t disk, const char *check_uuid,
}
static grub_err_t
-recover_key (grub_disk_t source, grub_cryptodisk_t dev)
+recover_key (grub_disk_t source, grub_cryptodisk_t dev,
+ grub_file_t hdr __attribute__ ((unused)) )
{
grub_size_t keysize;
grub_uint8_t digest[GRUB_CRYPTO_MAX_MDLEN];
diff --git a/grub-core/disk/luks.c b/grub-core/disk/luks.c
index 86c50c6..66e64c0 100644
--- a/grub-core/disk/luks.c
+++ b/grub-core/disk/luks.c
@@ -23,6 +23,7 @@
#include <grub/dl.h>
#include <grub/err.h>
#include <grub/disk.h>
+#include <grub/file.h>
#include <grub/crypto.h>
#include <grub/partition.h>
#include <grub/i18n.h>
@@ -66,7 +67,7 @@ gcry_err_code_t AF_merge (const gcry_md_spec_t * hash, grub_uint8_t * src,
static grub_cryptodisk_t
configure_ciphers (grub_disk_t disk, const char *check_uuid,
- int check_boot)
+ int check_boot, grub_file_t hdr)
{
grub_cryptodisk_t newdev;
const char *iptr;
@@ -86,11 +87,21 @@ configure_ciphers (grub_disk_t disk, const char *check_uuid,
int benbi_log = 0;
grub_err_t err;
+ err = GRUB_ERR_NONE;
+
if (check_boot)
return NULL;
/* Read the LUKS header. */
- err = grub_disk_read (disk, 0, 0, sizeof (header), &header);
+ if (hdr)
+ {
+ grub_file_seek (hdr, 0);
+ if (grub_file_read (hdr, &header, sizeof (header)) != sizeof (header))
+ err = GRUB_ERR_READ_ERROR;
+ }
+ else
+ err = grub_disk_read (disk, 0, 0, sizeof (header), &header);
+
if (err)
{
if (err == GRUB_ERR_OUT_OF_RANGE)
@@ -304,12 +315,14 @@ configure_ciphers (grub_disk_t disk, const char *check_uuid,
grub_memcpy (newdev->uuid, uuid, sizeof (newdev->uuid));
newdev->modname = "luks";
COMPILE_TIME_ASSERT (sizeof (newdev->uuid) >= sizeof (uuid));
+
return newdev;
}
static grub_err_t
luks_recover_key (grub_disk_t source,
- grub_cryptodisk_t dev)
+ grub_cryptodisk_t dev,
+ grub_file_t hdr)
{
struct grub_luks_phdr header;
grub_size_t keysize;
@@ -321,8 +334,19 @@ luks_recover_key (grub_disk_t source,
grub_err_t err;
grub_size_t max_stripes = 1;
char *tmp;
+ grub_uint32_t sector;
+
+ err = GRUB_ERR_NONE;
+
+ if (hdr)
+ {
+ grub_file_seek (hdr, 0);
+ if (grub_file_read (hdr, &header, sizeof (header)) != sizeof (header))
+ err = GRUB_ERR_READ_ERROR;
+ }
+ else
+ err = grub_disk_read (source, 0, 0, sizeof (header), &header);
- err = grub_disk_read (source, 0, 0, sizeof (header), &header);
if (err)
return err;
@@ -391,13 +415,18 @@ luks_recover_key (grub_disk_t source,
return grub_crypto_gcry_error (gcry_err);
}
+ sector = grub_be_to_cpu32 (header.keyblock[i].keyMaterialOffset);
length = (keysize * grub_be_to_cpu32 (header.keyblock[i].stripes));
/* Read and decrypt the key material from the disk. */
- err = grub_disk_read (source,
- grub_be_to_cpu32 (header.keyblock
- [i].keyMaterialOffset), 0,
- length, split_key);
+ if (hdr)
+ {
+ grub_file_seek (hdr, sector * 512);
+ if (grub_file_read (hdr, split_key, length) != (grub_ssize_t)length)
+ err = GRUB_ERR_READ_ERROR;
+ }
+ else
+ err = grub_disk_read (source, sector, 0, length, split_key);
if (err)
{
grub_free (split_key);
diff --git a/include/grub/cryptodisk.h b/include/grub/cryptodisk.h
index f2ad2a7..16dee3c 100644
--- a/include/grub/cryptodisk.h
+++ b/include/grub/cryptodisk.h
@@ -20,6 +20,7 @@
#define GRUB_CRYPTODISK_HEADER 1
#include <grub/disk.h>
+#include <grub/file.h>
#include <grub/crypto.h>
#include <grub/list.h>
#ifdef GRUB_UTIL
@@ -106,8 +107,8 @@ struct grub_cryptodisk_dev
struct grub_cryptodisk_dev **prev;
grub_cryptodisk_t (*scan) (grub_disk_t disk, const char *check_uuid,
- int boot_only);
- grub_err_t (*recover_key) (grub_disk_t disk, grub_cryptodisk_t dev);
+ int boot_only, grub_file_t hdr);
+ grub_err_t (*recover_key) (grub_disk_t disk, grub_cryptodisk_t dev, grub_file_t hdr);
};
typedef struct grub_cryptodisk_dev *grub_cryptodisk_dev_t;
--
2.1.2
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