forked from pool/grub2
128 lines
5.0 KiB
Diff
128 lines
5.0 KiB
Diff
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From a25627c13b7e1e6998a14b5dd23b04b28465d737 Mon Sep 17 00:00:00 2001
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From: Josselin Poiret via Grub-devel <grub-devel@gnu.org>
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Date: Tue, 14 Jun 2022 15:47:30 +0200
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Subject: [PATCH 02/10] devmapper/getroot: Set up cheated LUKS2 cryptodisk
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mount from DM parameters
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This lets a LUKS2 cryptodisk have its cipher and hash filled out,
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otherwise they wouldn't be initialized if cheat mounted.
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---
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grub-core/osdep/devmapper/getroot.c | 91 +++++++++++++++++++++++++++++++++++-
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1 file changed, 90 insertions(+), 1 deletion(-)
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--- a/grub-core/osdep/devmapper/getroot.c
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+++ b/grub-core/osdep/devmapper/getroot.c
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@@ -51,6 +51,8 @@
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#include <grub/emu/misc.h>
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#include <grub/emu/hostdisk.h>
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+#include <grub/cryptodisk.h>
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+
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static int
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grub_util_open_dm (const char *os_dev, struct dm_tree **tree,
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struct dm_tree_node **node)
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@@ -186,7 +188,6 @@
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&& lastsubdev)
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{
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char *grdev = grub_util_get_grub_dev (lastsubdev);
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- dm_tree_free (tree);
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if (grdev)
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{
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grub_err_t err;
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@@ -194,7 +195,95 @@
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if (err)
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grub_util_error (_("can't mount encrypted volume `%s': %s"),
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lastsubdev, grub_errmsg);
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+ if (strncmp (uuid, "CRYPT-LUKS2-", sizeof ("CRYPT-LUKS2-") - 1) == 0)
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+ {
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+ /* set LUKS2 cipher from dm parameters, since it is not
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+ * possible to determine the correct one without
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+ * unlocking, as there might be multiple segments.
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+ */
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+ grub_disk_t source;
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+ grub_cryptodisk_t cryptodisk;
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+ grub_uint64_t start, length;
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+ char *target_type;
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+ char *params;
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+ const char *name;
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+ char *cipher, *cipher_mode;
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+ struct dm_task *dmt;
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+ char *seek_head, *c;
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+ unsigned int remaining;
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+
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+ source = grub_disk_open (grdev);
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+ cryptodisk = grub_cryptodisk_get_by_source_disk (source);
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+ grub_disk_close (source);
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+
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+ name = dm_tree_node_get_name (node);
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+
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+ grub_util_info ("populating parameters of cryptomount `%s' from DM device `%s'",
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+ uuid, name);
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+
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+ dmt = dm_task_create (DM_DEVICE_TABLE);
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+ if (dmt == 0)
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+ grub_util_error (_("can't create dm task DM_DEVICE_TABLE"));
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+ if (dm_task_set_name (dmt, name) == 0)
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+ grub_util_error (_("can't set dm task name to `%s'"), name);
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+ if (dm_task_run (dmt) == 0)
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+ grub_util_error (_("can't run dm task for `%s'"), name);
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+ /* dm_get_next_target doesn't have any error modes, everything has
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+ * been handled by dm_task_run.
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+ */
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+ dm_get_next_target (dmt, NULL, &start, &length,
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+ &target_type, ¶ms);
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+ if (strncmp (target_type, "crypt", sizeof ("crypt")) != 0)
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+ grub_util_error (_("dm target of type `%s' is not `crypt'"),
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+ target_type);
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+
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+ /* dm target parameters for dm-crypt is
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+ * <cipher> <key> <iv_offset> <device path> <offset> [<#opt_params> <opt_param1> ...]
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+ */
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+ c = params;
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+ remaining = grub_strlen (c);
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+
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+ /* first, get the cipher name from the cipher */
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+ if (!(seek_head = grub_memchr (c, '-', remaining)))
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+ grub_util_error (_("can't get cipher from dm-crypt parameters `%s'"),
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+ params);
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+ cipher = grub_strndup (c, seek_head - c);
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+ remaining -= seek_head - c + 1;
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+ c = seek_head + 1;
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+
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+ /* now, the cipher mode */
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+ if (!(seek_head = grub_memchr (c, ' ', remaining)))
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+ grub_util_error (_("can't get cipher mode from dm-crypt parameters `%s'"),
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+ params);
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+ cipher_mode = grub_strndup (c, seek_head - c);
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+ remaining -= seek_head - c + 1;
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+ c = seek_head + 1;
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+
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+ err = grub_cryptodisk_setcipher (cryptodisk, cipher, cipher_mode);
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+ if (err)
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+ {
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+ grub_util_error (_("can't set cipher of cryptodisk `%s' to `%s' with mode `%s'"),
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+ uuid, cipher, cipher_mode);
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+ }
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+
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+ grub_free (cipher);
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+ grub_free (cipher_mode);
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+
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+ /* This is the only hash usable by PBKDF2, and we don't
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+ * have Argon2 support yet, so set it by default,
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+ * otherwise grub-probe would miss the required
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+ * abstraction
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+ */
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+ cryptodisk->hash = grub_crypto_lookup_md_by_name ("sha256");
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+ if (cryptodisk->hash == 0)
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+ {
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+ grub_util_error (_("can't lookup hash sha256 by name"));
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+ }
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+
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+ dm_task_destroy (dmt);
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+ }
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}
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+ dm_tree_free (tree);
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grub_free (grdev);
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}
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else
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