253 lines
9.2 KiB
Diff
253 lines
9.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Alastair D'Silva <alastair@d-silva.org>
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Date: Mon, 6 Jul 2020 13:33:04 +1000
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Subject: [PATCH] grub-install: support embedding x509 certificates
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To support verification of appended signatures, we need a way to
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embed the necessary public keys. Existing appended signature schemes
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in the Linux kernel use X.509 certificates, so allow certificates to
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be embedded in the grub core image in the same way as PGP keys.
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Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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---
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grub-core/commands/pgp.c | 2 +-
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util/grub-install-common.c | 22 +++++++++++++++++++++-
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util/grub-mkimage.c | 15 +++++++++++++--
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util/mkimage.c | 38 ++++++++++++++++++++++++++++++++++++--
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include/grub/kernel.h | 4 +++-
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include/grub/util/install.h | 7 +++++--
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6 files changed, 79 insertions(+), 9 deletions(-)
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diff --git a/grub-core/commands/pgp.c b/grub-core/commands/pgp.c
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index 355a43844ac..b81ac0ae46c 100644
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--- a/grub-core/commands/pgp.c
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+++ b/grub-core/commands/pgp.c
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@@ -944,7 +944,7 @@ GRUB_MOD_INIT(pgp)
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grub_memset (&pseudo_file, 0, sizeof (pseudo_file));
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/* Not an ELF module, skip. */
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- if (header->type != OBJ_TYPE_PUBKEY)
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+ if (header->type != OBJ_TYPE_GPG_PUBKEY)
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continue;
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pseudo_file.fs = &pseudo_fs;
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diff --git a/util/grub-install-common.c b/util/grub-install-common.c
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index a74fee16e22..2d9693ffeb7 100644
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--- a/util/grub-install-common.c
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+++ b/util/grub-install-common.c
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@@ -460,6 +460,8 @@ static char **pubkeys;
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static size_t npubkeys;
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static char *sbat;
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static int disable_shim_lock;
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+static char **x509keys;
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+static size_t nx509keys;
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static grub_compression_t compression;
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static size_t appsig_size;
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@@ -500,6 +502,11 @@ grub_install_parse (int key, char *arg)
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return 1;
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case GRUB_INSTALL_OPTIONS_DISABLE_SHIM_LOCK:
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disable_shim_lock = 1;
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+ case 'x':
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+ x509keys = xrealloc (x509keys,
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+ sizeof (x509keys[0])
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+ * (nx509keys + 1));
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+ x509keys[nx509keys++] = xstrdup (arg);
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return 1;
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case GRUB_INSTALL_OPTIONS_VERBOSITY:
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@@ -627,6 +634,9 @@ grub_install_make_image_wrap_file (const char *dir, const char *prefix,
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for (pk = pubkeys; pk < pubkeys + npubkeys; pk++)
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slen += 20 + grub_strlen (*pk);
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+ for (pk = x509keys; pk < x509keys + nx509keys; pk++)
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+ slen += 10 + grub_strlen (*pk);
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+
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for (md = modules.entries; *md; md++)
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{
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slen += 10 + grub_strlen (*md);
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@@ -655,6 +665,14 @@ grub_install_make_image_wrap_file (const char *dir, const char *prefix,
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*p++ = ' ';
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}
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+ for (pk = x509keys; pk < x509keys + nx509keys; pk++)
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+ {
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+ p = grub_stpcpy (p, "--x509 '");
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+ p = grub_stpcpy (p, *pk);
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+ *p++ = '\'';
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+ *p++ = ' ';
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+ }
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+
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for (md = modules.entries; *md; md++)
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{
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*p++ = '\'';
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@@ -684,7 +702,9 @@ grub_install_make_image_wrap_file (const char *dir, const char *prefix,
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grub_install_generate_image (dir, prefix, fp, outname,
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modules.entries, memdisk_path,
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- pubkeys, npubkeys, config_path, tgt,
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+ pubkeys, npubkeys,
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+ x509keys, nx509keys,
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+ config_path, tgt,
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note, appsig_size, compression, dtb, sbat,
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disable_shim_lock);
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while (dc--)
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diff --git a/util/grub-mkimage.c b/util/grub-mkimage.c
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index 8a53310548b..e1f1112784a 100644
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--- a/util/grub-mkimage.c
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+++ b/util/grub-mkimage.c
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@@ -75,7 +75,8 @@ static struct argp_option options[] = {
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/* TRANSLATORS: "embed" is a verb (command description). "*/
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{"config", 'c', N_("FILE"), 0, N_("embed FILE as an early config"), 0},
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/* TRANSLATORS: "embed" is a verb (command description). "*/
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- {"pubkey", 'k', N_("FILE"), 0, N_("embed FILE as public key for signature checking"), 0},
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+ {"pubkey", 'k', N_("FILE"), 0, N_("embed FILE as public key for PGP signature checking"), 0},
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+ {"x509", 'x', N_("FILE"), 0, N_("embed FILE as an x509 certificate for appended signature checking"), 0},
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/* TRANSLATORS: NOTE is a name of segment. */
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{"note", 'n', 0, 0, N_("add NOTE segment for CHRP IEEE1275"), 0},
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{"output", 'o', N_("FILE"), 0, N_("output a generated image to FILE [default=stdout]"), 0},
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@@ -124,6 +125,8 @@ struct arguments
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char *dtb;
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char **pubkeys;
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size_t npubkeys;
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+ char **x509keys;
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+ size_t nx509keys;
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char *font;
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char *config;
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char *sbat;
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@@ -206,6 +209,13 @@ argp_parser (int key, char *arg, struct argp_state *state)
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arguments->pubkeys[arguments->npubkeys++] = xstrdup (arg);
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break;
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+ case 'x':
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+ arguments->x509keys = xrealloc (arguments->x509keys,
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+ sizeof (arguments->x509keys[0])
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+ * (arguments->nx509keys + 1));
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+ arguments->x509keys[arguments->nx509keys++] = xstrdup (arg);
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+ break;
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+
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case 'c':
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if (arguments->config)
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free (arguments->config);
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@@ -332,7 +342,8 @@ main (int argc, char *argv[])
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grub_install_generate_image (arguments.dir, arguments.prefix, fp,
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arguments.output, arguments.modules,
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arguments.memdisk, arguments.pubkeys,
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- arguments.npubkeys, arguments.config,
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+ arguments.npubkeys, arguments.x509keys,
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+ arguments.nx509keys, arguments.config,
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arguments.image_target, arguments.note,
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arguments.appsig_size, arguments.comp,
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arguments.dtb, arguments.sbat,
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diff --git a/util/mkimage.c b/util/mkimage.c
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index bab12276010..8319e8dfbde 100644
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--- a/util/mkimage.c
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+++ b/util/mkimage.c
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@@ -867,7 +867,8 @@ void
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grub_install_generate_image (const char *dir, const char *prefix,
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FILE *out, const char *outname, char *mods[],
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char *memdisk_path, char **pubkey_paths,
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- size_t npubkeys, char *config_path,
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+ size_t npubkeys, char **x509key_paths,
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+ size_t nx509keys, char *config_path,
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const struct grub_install_image_target_desc *image_target,
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int note, size_t appsig_size, grub_compression_t comp,
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const char *dtb_path, const char *sbat_path,
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@@ -913,6 +914,19 @@ grub_install_generate_image (const char *dir, const char *prefix,
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}
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}
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+ {
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+ size_t i;
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+ for (i = 0; i < nx509keys; i++)
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+ {
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+ size_t curs;
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+ curs = ALIGN_ADDR (grub_util_get_image_size (x509key_paths[i]));
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+ grub_util_info ("the size of x509 public key %u is 0x%"
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+ GRUB_HOST_PRIxLONG_LONG,
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+ (unsigned) i, (unsigned long long) curs);
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+ total_module_size += curs + sizeof (struct grub_module_header);
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+ }
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+ }
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+
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if (memdisk_path)
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{
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memdisk_size = ALIGN_UP(grub_util_get_image_size (memdisk_path), 512);
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@@ -1034,7 +1048,7 @@ grub_install_generate_image (const char *dir, const char *prefix,
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curs = grub_util_get_image_size (pubkey_paths[i]);
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header = (struct grub_module_header *) (kernel_img + offset);
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- header->type = grub_host_to_target32 (OBJ_TYPE_PUBKEY);
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+ header->type = grub_host_to_target32 (OBJ_TYPE_GPG_PUBKEY);
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header->size = grub_host_to_target32 (curs + sizeof (*header));
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offset += sizeof (*header);
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@@ -1043,6 +1057,26 @@ grub_install_generate_image (const char *dir, const char *prefix,
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}
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}
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+ {
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+ size_t i;
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+ for (i = 0; i < nx509keys; i++)
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+ {
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+ size_t curs;
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+ struct grub_module_header *header;
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+
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+ curs = grub_util_get_image_size (x509key_paths[i]);
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+
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+ header = (struct grub_module_header *) (kernel_img + offset);
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+ header->type = grub_host_to_target32 (OBJ_TYPE_X509_PUBKEY);
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+ header->size = grub_host_to_target32 (curs + sizeof (*header));
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+ offset += sizeof (*header);
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+
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+ grub_util_load_image (x509key_paths[i], kernel_img + offset);
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+ offset += ALIGN_ADDR (curs);
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+ }
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+ }
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+
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+
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if (memdisk_path)
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{
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struct grub_module_header *header;
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diff --git a/include/grub/kernel.h b/include/grub/kernel.h
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index 55849777eaa..98edc0863f6 100644
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--- a/include/grub/kernel.h
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+++ b/include/grub/kernel.h
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@@ -30,7 +30,9 @@ enum
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OBJ_TYPE_PREFIX,
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OBJ_TYPE_PUBKEY,
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OBJ_TYPE_DTB,
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- OBJ_TYPE_DISABLE_SHIM_LOCK
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+ OBJ_TYPE_DISABLE_SHIM_LOCK,
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+ OBJ_TYPE_GPG_PUBKEY,
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+ OBJ_TYPE_X509_PUBKEY,
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};
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/* The module header. */
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diff --git a/include/grub/util/install.h b/include/grub/util/install.h
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index cf4531e02b6..51f3b13ac13 100644
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--- a/include/grub/util/install.h
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+++ b/include/grub/util/install.h
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@@ -67,6 +67,8 @@
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N_("SBAT metadata"), 0 }, \
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{ "disable-shim-lock", GRUB_INSTALL_OPTIONS_DISABLE_SHIM_LOCK, 0, 0, \
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N_("disable shim_lock verifier"), 0 }, \
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+ { "x509key", 'x', N_("FILE"), 0, \
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+ N_("embed FILE as an x509 certificate for signature checking"), 0}, \
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{ "appended-signature-size", GRUB_INSTALL_OPTIONS_APPENDED_SIGNATURE_SIZE,\
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"SIZE", 0, N_("Add a note segment reserving SIZE bytes for an appended signature"), \
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1}, \
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@@ -188,8 +190,9 @@ void
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grub_install_generate_image (const char *dir, const char *prefix,
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FILE *out,
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const char *outname, char *mods[],
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- char *memdisk_path, char **pubkey_paths,
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- size_t npubkeys,
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+ char *memdisk_path,
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+ char **pubkey_paths, size_t npubkeys,
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+ char **x509key_paths, size_t nx509keys,
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char *config_path,
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const struct grub_install_image_target_desc *image_target,
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int note, size_t appsig_size,
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