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-rw-r--r--src/fundamental/efivars-fundamental.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/src/fundamental/efivars-fundamental.c b/src/fundamental/efivars-fundamental.c
new file mode 100644
index 0000000..2ec3bfb
--- /dev/null
+++ b/src/fundamental/efivars-fundamental.c
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "efivars-fundamental.h"
+
+static const sd_char * const table[_SECURE_BOOT_MAX] = {
+ [SECURE_BOOT_UNSUPPORTED] = STR_C("unsupported"),
+ [SECURE_BOOT_DISABLED] = STR_C("disabled"),
+ [SECURE_BOOT_UNKNOWN] = STR_C("unknown"),
+ [SECURE_BOOT_AUDIT] = STR_C("audit"),
+ [SECURE_BOOT_DEPLOYED] = STR_C("deployed"),
+ [SECURE_BOOT_SETUP] = STR_C("setup"),
+ [SECURE_BOOT_USER] = STR_C("user"),
+};
+
+const sd_char *secure_boot_mode_to_string(SecureBootMode m) {
+ return (m >= 0 && m < _SECURE_BOOT_MAX) ? table[m] : NULL;
+}
+
+SecureBootMode decode_secure_boot_mode(bool secure, bool audit, bool deployed, bool setup) {
+ /* See figure 32-4 Secure Boot Modes from UEFI Specification 2.9 */
+ if (secure && deployed && !audit && !setup)
+ return SECURE_BOOT_DEPLOYED;
+ if (secure && !deployed && !audit && !setup)
+ return SECURE_BOOT_USER;
+ if (!secure && !deployed && audit && setup)
+ return SECURE_BOOT_AUDIT;
+ if (!secure && !deployed && !audit && setup)
+ return SECURE_BOOT_SETUP;
+
+ /* Some firmware allows disabling secure boot while not being in
+ * setup mode unless the PK is cleared. */
+ if (!secure && !deployed && !audit && !setup)
+ return SECURE_BOOT_DISABLED;
+
+ /* Well, this should not happen. */
+ return SECURE_BOOT_UNKNOWN;
+}