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grub2.22047
0005-efi-Add-secure-boot-detection.patch
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File 0005-efi-Add-secure-boot-detection.patch of Package grub2.22047
From 12650d0953372674fb587c2e6331257fc7a90a94 Mon Sep 17 00:00:00 2001 From: Daniel Kiper <daniel.kiper@oracle.com> Date: Thu, 3 Dec 2020 16:01:48 +0100 Subject: [PATCH 05/46] efi: Add secure boot detection Introduce grub_efi_get_secureboot() function which returns whether UEFI Secure Boot is enabled or not on UEFI systems. Signed-off-by: Ignat Korchagin <ignat@cloudflare.com> Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com> Signed-off-by: Marco A Benatto <mbenatto@redhat.com> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> --- grub-core/Makefile.am | 1 + grub-core/Makefile.core.def | 1 + grub-core/kern/efi/sb.c | 109 ++++++++++++++++++++++++++++++++++++ include/grub/efi/sb.h | 40 +++++++++++++ 4 files changed, 151 insertions(+) create mode 100644 grub-core/kern/efi/sb.c create mode 100644 include/grub/efi/sb.h diff --git a/grub-core/Makefile.am b/grub-core/Makefile.am index ede596170..5ff3afd62 100644 --- a/grub-core/Makefile.am +++ b/grub-core/Makefile.am @@ -71,6 +71,7 @@ KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/command.h KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/device.h KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/disk.h KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/dl.h +KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/sb.h KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/env.h KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/env_private.h KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/err.h diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def index ce4f71ebe..072b1628c 100644 --- a/grub-core/Makefile.core.def +++ b/grub-core/Makefile.core.def @@ -203,6 +203,7 @@ kernel = { efi = term/efi/console.c; efi = kern/acpi.c; efi = kern/efi/acpi.c; + efi = kern/efi/sb.c; i386_coreboot = kern/i386/pc/acpi.c; i386_multiboot = kern/i386/pc/acpi.c; i386_coreboot = kern/acpi.c; diff --git a/grub-core/kern/efi/sb.c b/grub-core/kern/efi/sb.c new file mode 100644 index 000000000..19658d962 --- /dev/null +++ b/grub-core/kern/efi/sb.c @@ -0,0 +1,109 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2020 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + * + * UEFI Secure Boot related checkings. + */ + +#include <grub/efi/efi.h> +#include <grub/efi/pe32.h> +#include <grub/efi/sb.h> +#include <grub/err.h> +#include <grub/i386/linux.h> +#include <grub/mm.h> +#include <grub/types.h> + +/* + * Determine whether we're in secure boot mode. + * + * Please keep the logic in sync with the Linux kernel, + * drivers/firmware/efi/libstub/secureboot.c:efi_get_secureboot(). + */ +grub_uint8_t +grub_efi_get_secureboot (void) +{ + static grub_efi_guid_t efi_variable_guid = GRUB_EFI_GLOBAL_VARIABLE_GUID; + static grub_efi_guid_t efi_shim_lock_guid = GRUB_EFI_SHIM_LOCK_GUID; + grub_efi_status_t status; + grub_efi_uint32_t attr = 0; + grub_size_t size = 0; + grub_uint8_t *secboot = NULL; + grub_uint8_t *setupmode = NULL; + grub_uint8_t *moksbstate = NULL; + grub_uint8_t secureboot = GRUB_EFI_SECUREBOOT_MODE_UNKNOWN; + const char *secureboot_str = "UNKNOWN"; + + status = grub_efi_get_variable ("SecureBoot", &efi_variable_guid, + &size, (void **) &secboot); + + if (status == GRUB_EFI_NOT_FOUND) + { + secureboot = GRUB_EFI_SECUREBOOT_MODE_DISABLED; + goto out; + } + + if (status != GRUB_EFI_SUCCESS) + goto out; + + status = grub_efi_get_variable ("SetupMode", &efi_variable_guid, + &size, (void **) &setupmode); + + if (status != GRUB_EFI_SUCCESS) + goto out; + + if ((*secboot == 0) || (*setupmode == 1)) + { + secureboot = GRUB_EFI_SECUREBOOT_MODE_DISABLED; + goto out; + } + + /* + * See if a user has put the shim into insecure mode. If so, and if the + * variable doesn't have the runtime attribute set, we might as well + * honor that. + */ + status = grub_efi_get_variable_with_attributes ("MokSBState", &efi_shim_lock_guid, + &size, (void **) &moksbstate, &attr); + + /* If it fails, we don't care why. Default to secure. */ + if (status != GRUB_EFI_SUCCESS) + { + secureboot = GRUB_EFI_SECUREBOOT_MODE_ENABLED; + goto out; + } + + if (!(attr & GRUB_EFI_VARIABLE_RUNTIME_ACCESS) && *moksbstate == 1) + { + secureboot = GRUB_EFI_SECUREBOOT_MODE_DISABLED; + goto out; + } + + secureboot = GRUB_EFI_SECUREBOOT_MODE_ENABLED; + + out: + grub_free (moksbstate); + grub_free (setupmode); + grub_free (secboot); + + if (secureboot == GRUB_EFI_SECUREBOOT_MODE_DISABLED) + secureboot_str = "Disabled"; + else if (secureboot == GRUB_EFI_SECUREBOOT_MODE_ENABLED) + secureboot_str = "Enabled"; + + grub_dprintf ("efi", "UEFI Secure Boot state: %s\n", secureboot_str); + + return secureboot; +} diff --git a/include/grub/efi/sb.h b/include/grub/efi/sb.h new file mode 100644 index 000000000..a33d985e3 --- /dev/null +++ b/include/grub/efi/sb.h @@ -0,0 +1,40 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2020 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef GRUB_EFI_SB_H +#define GRUB_EFI_SB_H 1 + +#include <grub/types.h> +#include <grub/dl.h> + +#define GRUB_EFI_SECUREBOOT_MODE_UNSET 0 +#define GRUB_EFI_SECUREBOOT_MODE_UNKNOWN 1 +#define GRUB_EFI_SECUREBOOT_MODE_DISABLED 2 +#define GRUB_EFI_SECUREBOOT_MODE_ENABLED 3 + +#ifdef GRUB_MACHINE_EFI +extern grub_uint8_t +EXPORT_FUNC (grub_efi_get_secureboot) (void); +#else +static inline grub_uint8_t +grub_efi_get_secureboot (void) +{ + return GRUB_EFI_SECUREBOOT_MODE_UNSET; +} +#endif +#endif /* GRUB_EFI_SB_H */ -- 2.26.2
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