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-rw-r--r--lib/efi_loader/efi_variable.c231
1 files changed, 228 insertions, 3 deletions
diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c
index adb78470f2d..fd5c41f830b 100644
--- a/lib/efi_loader/efi_variable.c
+++ b/lib/efi_loader/efi_variable.c
@@ -16,8 +16,16 @@
#include <u-boot/crc.h>
#include "../lib/crypto/pkcs7_parser.h"
+enum efi_secure_mode {
+ EFI_MODE_SETUP,
+ EFI_MODE_USER,
+ EFI_MODE_AUDIT,
+ EFI_MODE_DEPLOYED,
+};
+
const efi_guid_t efi_guid_cert_type_pkcs7 = EFI_CERT_TYPE_PKCS7_GUID;
static bool efi_secure_boot;
+static int efi_secure_mode;
#define READ_ONLY BIT(31)
@@ -160,6 +168,210 @@ static const char *parse_attr(const char *str, u32 *attrp, u64 *timep)
return str;
}
+static efi_status_t efi_set_variable_internal(u16 *variable_name,
+ const efi_guid_t *vendor,
+ u32 attributes,
+ efi_uintn_t data_size,
+ const void *data,
+ bool ro_check);
+
+/**
+ * efi_transfer_secure_state - handle a secure boot state transition
+ * @mode: new state
+ *
+ * Depending on @mode, secure boot related variables are updated.
+ * Those variables are *read-only* for users, efi_set_variable_internal()
+ * is called here.
+ *
+ * Return: EFI_SUCCESS on success, status code (negative) on error
+ */
+static efi_status_t efi_transfer_secure_state(enum efi_secure_mode mode)
+{
+ u32 attributes;
+ u8 val;
+ efi_status_t ret;
+
+ debug("Secure state from %d to %d\n", efi_secure_mode, mode);
+
+ attributes = EFI_VARIABLE_BOOTSERVICE_ACCESS |
+ EFI_VARIABLE_RUNTIME_ACCESS;
+ if (mode == EFI_MODE_DEPLOYED) {
+ val = 1;
+ ret = efi_set_variable_internal(L"SecureBoot",
+ &efi_global_variable_guid,
+ attributes | READ_ONLY,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+ val = 0;
+ ret = efi_set_variable_internal(L"SetupMode",
+ &efi_global_variable_guid,
+ attributes | READ_ONLY,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+ val = 0;
+ ret = efi_set_variable_internal(L"AuditMode",
+ &efi_global_variable_guid,
+ attributes | READ_ONLY,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+ val = 1;
+ ret = efi_set_variable_internal(L"DeployedMode",
+ &efi_global_variable_guid,
+ attributes | READ_ONLY,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+
+ efi_secure_boot = true;
+ } else if (mode == EFI_MODE_AUDIT) {
+ ret = efi_set_variable_internal(L"PK",
+ &efi_global_variable_guid,
+ attributes,
+ 0, NULL,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+ val = 0;
+ ret = efi_set_variable_internal(L"SecureBoot",
+ &efi_global_variable_guid,
+ attributes | READ_ONLY,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+ val = 1;
+ ret = efi_set_variable_internal(L"SetupMode",
+ &efi_global_variable_guid,
+ attributes | READ_ONLY,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+ val = 1;
+ ret = efi_set_variable_internal(L"AuditMode",
+ &efi_global_variable_guid,
+ attributes | READ_ONLY,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+ val = 0;
+ ret = efi_set_variable_internal(L"DeployedMode",
+ &efi_global_variable_guid,
+ attributes | READ_ONLY,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+
+ efi_secure_boot = true;
+ } else if (mode == EFI_MODE_USER) {
+ val = 1;
+ ret = efi_set_variable_internal(L"SecureBoot",
+ &efi_global_variable_guid,
+ attributes | READ_ONLY,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+ val = 0;
+ ret = efi_set_variable_internal(L"SetupMode",
+ &efi_global_variable_guid,
+ attributes | READ_ONLY,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+ val = 0;
+ ret = efi_set_variable_internal(L"AuditMode",
+ &efi_global_variable_guid,
+ attributes,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+ val = 0;
+ ret = efi_set_variable_internal(L"DeployedMode",
+ &efi_global_variable_guid,
+ attributes,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+
+ efi_secure_boot = true;
+ } else if (mode == EFI_MODE_SETUP) {
+ val = 0;
+ ret = efi_set_variable_internal(L"SecureBoot",
+ &efi_global_variable_guid,
+ attributes | READ_ONLY,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+ val = 1;
+ ret = efi_set_variable_internal(L"SetupMode",
+ &efi_global_variable_guid,
+ attributes | READ_ONLY,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+ val = 0;
+ ret = efi_set_variable_internal(L"AuditMode",
+ &efi_global_variable_guid,
+ attributes,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+ val = 0;
+ ret = efi_set_variable_internal(L"DeployedMode",
+ &efi_global_variable_guid,
+ attributes | READ_ONLY,
+ sizeof(val), &val,
+ false);
+ if (ret != EFI_SUCCESS)
+ goto err;
+ } else {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ return EFI_SUCCESS;
+
+err:
+ /* TODO: What action should be taken here? */
+ printf("ERROR: Secure state transition failed\n");
+ return ret;
+}
+
+/**
+ * efi_init_secure_state - initialize secure boot state
+ *
+ * Return: EFI_SUCCESS on success, status code (negative) on error
+ */
+static efi_status_t efi_init_secure_state(void)
+{
+ efi_uintn_t size = 0;
+ efi_status_t ret;
+
+ ret = EFI_CALL(efi_get_variable(L"PK", &efi_global_variable_guid,
+ NULL, &size, NULL));
+ if (ret == EFI_BUFFER_TOO_SMALL && IS_ENABLED(CONFIG_EFI_SECURE_BOOT))
+ ret = efi_transfer_secure_state(EFI_MODE_USER);
+ else
+ ret = efi_transfer_secure_state(EFI_MODE_SETUP);
+
+ return ret;
+}
+
/**
* efi_secure_boot_enabled - return if secure boot is enabled or not
*
@@ -910,10 +1122,19 @@ efi_status_t EFIAPI efi_set_variable_common(u16 *variable_name,
EFI_PRINT("setting: %s=%s\n", native_name, val);
out:
- if (env_set(native_name, val))
+ if (env_set(native_name, val)) {
ret = EFI_DEVICE_ERROR;
- else
+ } else {
+ if ((u16_strcmp(variable_name, L"PK") == 0 &&
+ guidcmp(vendor, &efi_global_variable_guid) == 0)) {
+ ret = efi_transfer_secure_state(
+ (delete ? EFI_MODE_SETUP :
+ EFI_MODE_USER));
+ if (ret != EFI_SUCCESS)
+ goto err;
+ }
ret = EFI_SUCCESS;
+ }
err:
free(native_name);
@@ -1098,5 +1319,9 @@ void efi_variables_boot_exit_notify(void)
*/
efi_status_t efi_init_variables(void)
{
- return EFI_SUCCESS;
+ efi_status_t ret;
+
+ ret = efi_init_secure_state();
+
+ return ret;
}
generated by cgit v1.2.3 (git 2.0.4) at 2025-07-24 22:48:37 +0000