From: Alastair D'Silva <alast...@d-silva.org>
To support verification of appended signatures, we need a way to
embed the necessary public keys. Existing appended signature schemes
in the Linux kernel use X.509 certificates, so allow certificates to
be embedded in the GRUB core image in the same way as PGP keys.
Signed-off-by: Alastair D'Silva <alast...@d-silva.org>
Signed-off-by: Daniel Axtens <d...@axtens.net>
Signed-off-by: Sudhakar Kuppusamy <sudha...@linux.ibm.com>
Reviewed-by: Stefan Berger <stef...@linux.ibm.com>
Reviewed-by: Avnish Chouhan <avn...@linux.ibm.com>
---
include/grub/kernel.h | 1 +
include/grub/util/install.h | 3 +++
util/grub-install-common.c | 19 ++++++++++++++++++-
util/grub-mkimage.c | 12 +++++++++++-
util/mkimage.c | 35 ++++++++++++++++++++++++++++++++++-
5 files changed, 67 insertions(+), 3 deletions(-)
diff --git a/include/grub/kernel.h b/include/grub/kernel.h
index 885289f5d..9f3e2031f 100644
--- a/include/grub/kernel.h
+++ b/include/grub/kernel.h
@@ -29,6 +29,7 @@ enum
OBJ_TYPE_CONFIG,
OBJ_TYPE_PREFIX,
OBJ_TYPE_GPG_PUBKEY,
+ OBJ_TYPE_X509_PUBKEY,
OBJ_TYPE_DTB,
OBJ_TYPE_DISABLE_SHIM_LOCK,
OBJ_TYPE_DISABLE_CLI
diff --git a/include/grub/util/install.h b/include/grub/util/install.h
index e620dc95b..91aa0023b 100644
--- a/include/grub/util/install.h
+++ b/include/grub/util/install.h
@@ -69,6 +69,8 @@
N_("disable shim_lock verifier"), 0 }, \
{ "disable-cli", GRUB_INSTALL_OPTIONS_DISABLE_CLI, 0, 0, \
N_("disabled command line interface access"), 0 }, \
+ { "x509key", 'x', N_("FILE"), 0, \
+ N_("embed FILE as an x509 certificate for appended signature checking"),
0}, \
{ "appended-signature-size", GRUB_INSTALL_OPTIONS_APPENDED_SIGNATURE_SIZE, \
"SIZE", 0, N_("Add a note segment reserving SIZE bytes for an appended
signature"), 1}, \
{ "verbose", 'v', 0, 0, \
@@ -196,6 +198,7 @@ grub_install_generate_image (const char *dir, const char
*prefix,
const char *outname, char *mods[],
char *memdisk_path, char **pubkey_paths,
size_t npubkeys,
+ char **x509key_paths, size_t nx509keys,
char *config_path,
const struct grub_install_image_target_desc
*image_target,
int note, size_t appsig_size,
diff --git a/util/grub-install-common.c b/util/grub-install-common.c
index b8aa40cd3..900a300bf 100644
--- a/util/grub-install-common.c
+++ b/util/grub-install-common.c
@@ -463,6 +463,8 @@ handle_install_list (struct install_list *il, const char
*val,
static char **pubkeys;
static size_t npubkeys;
+static char **x509keys;
+static size_t nx509keys;
static char *sbat;
static int disable_shim_lock;
static grub_compression_t compression;
@@ -511,6 +513,10 @@ grub_install_parse (int key, char *arg)
case GRUB_INSTALL_OPTIONS_DISABLE_CLI:
disable_cli = 1;
return 1;
+ case 'x':
+ x509keys = xrealloc (x509keys, sizeof (x509keys[0]) * (nx509keys + 1));
+ x509keys[nx509keys++] = xstrdup (arg);
+ return 1;
case GRUB_INSTALL_OPTIONS_VERBOSITY:
verbosity++;
@@ -650,6 +656,9 @@ grub_install_make_image_wrap_file (const char *dir, const
char *prefix,
for (pk = pubkeys; pk < pubkeys + npubkeys; pk++)
slen += sizeof (" --pubkey ''") + grub_strlen (*pk);
+ for (pk = x509keys; pk < x509keys + nx509keys; pk++)
+ slen += sizeof (" --x509key ''") + grub_strlen (*pk);
+
for (md = modules.entries; *md; md++)
slen += sizeof (" ''") + grub_strlen (*md);
@@ -690,6 +699,14 @@ grub_install_make_image_wrap_file (const char *dir, const
char *prefix,
*p++ = '\'';
}
+ for (pk = x509keys; pk < x509keys + nx509keys; pk++)
+ {
+ p = grub_stpcpy (p, "--x509key '");
+ p = grub_stpcpy (p, *pk);
+ *p++ = '\'';
+ *p++ = ' ';
+ }
+
for (md = modules.entries; *md; md++)
{
*p++ = ' ';
@@ -716,7 +733,7 @@ grub_install_make_image_wrap_file (const char *dir, const
char *prefix,
grub_install_generate_image (dir, prefix, fp, outname,
modules.entries, memdisk_path,
- pubkeys, npubkeys, config_path, tgt,
+ pubkeys, npubkeys, x509keys, nx509keys,
config_path, tgt,
note, appsig_size, compression, dtb, sbat,
disable_shim_lock, disable_cli);
while (dc--)
diff --git a/util/grub-mkimage.c b/util/grub-mkimage.c
index b39d35bb1..e7a84add2 100644
--- a/util/grub-mkimage.c
+++ b/util/grub-mkimage.c
@@ -76,6 +76,7 @@ static struct argp_option options[] = {
{"config", 'c', N_("FILE"), 0, N_("embed FILE as an early config"), 0},
/* TRANSLATORS: "embed" is a verb (command description). "*/
{"pubkey", 'k', N_("FILE"), 0, N_("embed FILE as public key for PGP
signature checking"), 0},
+ {"x509key", 'x', N_("FILE"), 0, N_("embed FILE as an x509 certificate
for appended signature checking"), 0},
/* TRANSLATORS: NOTE is a name of segment. */
{"note", 'n', 0, 0, N_("add NOTE segment for CHRP IEEE1275"), 0},
{"output", 'o', N_("FILE"), 0, N_("output a generated image to FILE
[default=stdout]"), 0},
@@ -125,6 +126,8 @@ struct arguments
char *dtb;
char **pubkeys;
size_t npubkeys;
+ char **x509keys;
+ size_t nx509keys;
char *font;
char *config;
char *sbat;
@@ -217,6 +220,12 @@ argp_parser (int key, char *arg, struct argp_state *state)
arguments->pubkeys[arguments->npubkeys++] = xstrdup (arg);
break;
+ case 'x':
+ arguments->x509keys = xrealloc (arguments->x509keys,
+ sizeof (arguments->x509keys[0]) *
(arguments->nx509keys + 1));
+ arguments->x509keys[arguments->nx509keys++] = xstrdup (arg);
+ break;
+
case 'c':
if (arguments->config)
free (arguments->config);
@@ -347,7 +356,8 @@ main (int argc, char *argv[])
grub_install_generate_image (arguments.dir, arguments.prefix, fp,
arguments.output, arguments.modules,
arguments.memdisk, arguments.pubkeys,
- arguments.npubkeys, arguments.config,
+ arguments.npubkeys, arguments.x509keys,
+ arguments.nx509keys, arguments.config,
arguments.image_target, arguments.note,
arguments.appsig_size,
arguments.comp, arguments.dtb,
diff --git a/util/mkimage.c b/util/mkimage.c
index 61c4e78e2..cea211df8 100644
--- a/util/mkimage.c
+++ b/util/mkimage.c
@@ -883,7 +883,7 @@ void
grub_install_generate_image (const char *dir, const char *prefix,
FILE *out, const char *outname, char *mods[],
char *memdisk_path, char **pubkey_paths,
- size_t npubkeys, char *config_path,
+ size_t npubkeys, char **x509key_paths, size_t
nx509keys, char *config_path,
const struct grub_install_image_target_desc
*image_target,
int note, size_t appsig_size, grub_compression_t
comp, const char *dtb_path,
const char *sbat_path, int disable_shim_lock,
@@ -929,6 +929,20 @@ grub_install_generate_image (const char *dir, const char
*prefix,
}
}
+ {
+ size_t i;
+
+ for (i = 0; i < nx509keys; i++)
+ {
+ size_t curs;
+
+ curs = ALIGN_ADDR (grub_util_get_image_size (x509key_paths[i]));
+ grub_util_info ("the size of x509 public key %u is 0x%"
GRUB_HOST_PRIxLONG_LONG,
+ (unsigned) i, (unsigned long long) curs);
+ total_module_size += curs + sizeof (struct grub_module_header);
+ }
+ }
+
if (memdisk_path)
{
memdisk_size = ALIGN_UP(grub_util_get_image_size (memdisk_path), 512);
@@ -1065,6 +1079,25 @@ grub_install_generate_image (const char *dir, const char
*prefix,
}
}
+ {
+ size_t i;
+
+ for (i = 0; i < nx509keys; i++)
+ {
+ size_t curs;
+ struct grub_module_header *header;
+
+ curs = grub_util_get_image_size (x509key_paths[i]);
+ header = (struct grub_module_header *) (kernel_img + offset);
+ header->type = grub_host_to_target32 (OBJ_TYPE_X509_PUBKEY);
+ header->size = grub_host_to_target32 (curs + sizeof (*header));
+
+ offset += sizeof (*header);
+ grub_util_load_image (x509key_paths[i], kernel_img + offset);
+ offset += ALIGN_ADDR (curs);
+ }
+ }
+
if (memdisk_path)
{
struct grub_module_header *header;
--
2.49.0
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