Tool to manage UEFI Secure Boot MoK Keys
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Renaud=20M=C3=A9trich?= <rmetrich@redhat.com>
Date: Fri, 3 Dec 2021 14:18:31 +0100
Subject: [PATCH] mokutil: enable setting fallback verbosity and noreboot mode
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Having mokutil handle FALLBACK_VERBOSE and FB_NO_REBOOT variables eases
fallback debugging.
Signed-off-by: Renaud Métrich <rmetrich@redhat.com>
(cherry picked from commit 57bc385827e7c0e0c86f30bbfa2d48ca9505537e)
(cherry picked from commit 99d3990bdbbca0419dc97133f27d6932b3234224)
[rharwood: no sb_check, no util renaming]
(cherry picked from commit 157a0969bdb5e7df152b4241f90b48209c235f2f)
[rharwood: flags are sparse now]
---
src/mokutil.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
data/mokutil | 8 +++++++
man/mokutil.1 | 10 +++++++++
3 files changed, 88 insertions(+)
diff --git a/src/mokutil.c b/src/mokutil.c
index 838599c..1cec4e9 100644
--- a/src/mokutil.c
+++ b/src/mokutil.c
@@ -83,6 +83,8 @@
#define IMPORT_HASH (1 << 21)
#define DELETE_HASH (1 << 22)
#define VERBOSITY (1 << 23)
+#define FB_VERBOSITY (1 << 25)
+#define FB_NOREBOOT (1 << 26)
#define DEFAULT_CRYPT_METHOD SHA512_BASED
#define DEFAULT_SALT_SIZE SHA512_SALT_MAX
@@ -152,6 +154,8 @@ print_help ()
printf (" --import-hash <hash>\t\t\tImport a hash into MOK or MOKX\n");
printf (" --delete-hash <hash>\t\t\tDelete a hash in MOK or MOKX\n");
printf (" --set-verbosity <true/false>\t\tSet the verbosity bit for shim\n");
+ printf (" --set-fallback-verbosity <true/false>\t\tSet the verbosity bit for fallback\n");
+ printf (" --set-fallback-noreboot <true/false>\t\tPrevent fallback from automatically rebooting\n");
printf (" --pk\t\t\t\t\tList the keys in PK\n");
printf (" --kek\t\t\t\t\tList the keys in KEK\n");
printf (" --db\t\t\t\t\tList the keys in db\n");
@@ -2135,6 +2139,46 @@ set_verbosity (uint8_t verbosity)
return 0;
}
+static int
+set_fallback_verbosity (const uint8_t verbosity)
+{
+ if (verbosity) {
+ uint32_t attributes = EFI_VARIABLE_NON_VOLATILE
+ | EFI_VARIABLE_BOOTSERVICE_ACCESS
+ | EFI_VARIABLE_RUNTIME_ACCESS;
+ if (efi_set_variable (efi_guid_shim, "FALLBACK_VERBOSE",
+ (uint8_t *)&verbosity, sizeof (verbosity),
+ attributes, S_IRUSR | S_IWUSR) < 0) {
+ fprintf (stderr, "Failed to set FALLBACK_VERBOSE\n");
+ return -1;
+ }
+ } else {
+ return test_and_delete_var ("FALLBACK_VERBOSE");
+ }
+
+ return 0;
+}
+
+static int
+set_fallback_noreboot (const uint8_t noreboot)
+{
+ if (noreboot) {
+ uint32_t attributes = EFI_VARIABLE_NON_VOLATILE
+ | EFI_VARIABLE_BOOTSERVICE_ACCESS
+ | EFI_VARIABLE_RUNTIME_ACCESS;
+ if (efi_set_variable (efi_guid_shim, "FB_NO_REBOOT",
+ (uint8_t *)&noreboot, sizeof (noreboot),
+ attributes, S_IRUSR | S_IWUSR) < 0) {
+ fprintf (stderr, "Failed to set FB_NO_REBOOT\n");
+ return -1;
+ }
+ } else {
+ return test_and_delete_var ("FB_NO_REBOOT");
+ }
+
+ return 0;
+}
+
static inline int
list_db (DBName db_name)
{
@@ -2169,6 +2213,8 @@ main (int argc, char *argv[])
unsigned int command = 0;
int use_root_pw = 0;
uint8_t verbosity = 0;
+ uint8_t fb_verbosity = 0;
+ uint8_t fb_noreboot = 0;
DBName db_name = MOK_LIST_RT;
int ret = -1;
@@ -2207,6 +2253,8 @@ main (int argc, char *argv[])
{"import-hash", required_argument, 0, 0 },
{"delete-hash", required_argument, 0, 0 },
{"set-verbosity", required_argument, 0, 0 },
+ {"set-fallback-verbosity", required_argument, 0, 0 },
+ {"set-fallback-noreboot", required_argument, 0, 0 },
{"pk", no_argument, 0, 0 },
{"kek", no_argument, 0, 0 },
{"db", no_argument, 0, 0 },
@@ -2270,6 +2318,22 @@ main (int argc, char *argv[])
verbosity = 0;
else
command |= HELP;
+ } else if (strcmp (option, "set-fallback-verbosity") == 0) {
+ command |= FB_VERBOSITY;
+ if (strcmp (optarg, "true") == 0)
+ fb_verbosity = 1;
+ else if (strcmp (optarg, "false") == 0)
+ fb_verbosity = 0;
+ else
+ command |= HELP;
+ } else if (strcmp (option, "set-fallback-noreboot") == 0) {
+ command |= FB_NOREBOOT;
+ if (strcmp (optarg, "true") == 0)
+ fb_noreboot = 1;
+ else if (strcmp (optarg, "false") == 0)
+ fb_noreboot = 0;
+ else
+ command |= HELP;
} else if (strcmp (option, "pk") == 0) {
if (db_name != MOK_LIST_RT) {
command |= HELP;
@@ -2557,6 +2621,12 @@ main (int argc, char *argv[])
case VERBOSITY:
ret = set_verbosity (verbosity);
break;
+ case FB_VERBOSITY:
+ ret = set_fallback_verbosity (fb_verbosity);
+ break;
+ case FB_NOREBOOT:
+ ret = set_fallback_noreboot (fb_noreboot);
+ break;
default:
print_help ();
break;
diff --git a/data/mokutil b/data/mokutil
index 800b039..af6b6ff 100755
--- a/data/mokutil
+++ b/data/mokutil
@@ -24,6 +24,14 @@ _mokutil()
COMPREPLY=( $( compgen -W "true false") )
return 0
;;
+ --set-fallback-verbosity)
+ COMPREPLY=( $( compgen -W "true false") )
+ return 0
+ ;;
+ --set-fallback-noreboot)
+ COMPREPLY=( $( compgen -W "true false") )
+ return 0
+ ;;
--generate-hash|-g)
COMPREPLY=( $( compgen -o nospace -P= -W "") )
return 0
diff --git a/man/mokutil.1 b/man/mokutil.1
index 25fe8b4..30dcfb2 100644
--- a/man/mokutil.1
+++ b/man/mokutil.1
@@ -65,6 +65,10 @@ mokutil \- utility to manipulate machine owner keys
.br
\fBmokutil\fR [--set-verbosity (\fItrue\fR | \fIfalse\fR)]
.br
+\fBmokutil\fR [--set-fallback-verbosity (\fItrue\fR | \fIfalse\fR)]
+.br
+\fBmokutil\fR [--set-fallback-noreboot (\fItrue\fR | \fIfalse\fR)]
+.br
\fBmokutil\fR [--pk]
.br
\fBmokutil\fR [--kek]
@@ -161,6 +165,12 @@ this is not the password hash.
\fB--set-verbosity\fR
Set the SHIM_VERBOSE to make shim more or less verbose
.TP
+\fB--set-fallback-verbosity\fR
+Set the FALLBACK_VERBOSE to make fallback more or less verbose
+.TP
+\fB--set-fallback-noreboot\fR
+Set the FB_NO_REBOOT to prevent fallback from automatically rebooting the system
+.TP
\fB--pk\fR
List the keys in the public Platform Key (PK)
.TP