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08e3eaafe0
I think this is only possible when a raw partition with no filesystem has the ESP or BDP UEFI GUID set in the partition table.
107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
/*
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* Copyright (C) 2020 Richard Hughes <richard@hughsie.com>
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*
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* SPDX-License-Identifier: LGPL-2.1+
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*/
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#include "config.h"
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#include <fwupdplugin.h>
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#include "fu-efi-image.h"
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#include "fu-uefi-dbx-common.h"
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gchar *
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fu_uefi_dbx_get_authenticode_hash(const gchar *fn, GError **error)
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{
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g_autoptr(FuEfiImage) img = NULL;
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g_autoptr(GBytes) bytes = NULL;
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g_autoptr(GMappedFile) mmap = NULL;
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g_debug("getting Authenticode hash of %s", fn);
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mmap = g_mapped_file_new(fn, FALSE, error);
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if (mmap == NULL)
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return NULL;
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bytes = g_mapped_file_get_bytes(mmap);
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img = fu_efi_image_new(bytes, error);
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if (img == NULL)
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return NULL;
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g_debug("SHA256 was %s", fu_efi_image_get_checksum(img));
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return g_strdup(fu_efi_image_get_checksum(img));
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}
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static gboolean
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fu_uefi_dbx_signature_list_validate_volume(FuEfiSignatureList *siglist,
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FuVolume *esp,
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GError **error)
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{
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g_autofree gchar *esp_path = NULL;
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g_autoptr(GPtrArray) files = NULL;
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/* get list of files contained in the ESP */
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esp_path = fu_volume_get_mount_point(esp);
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if (esp_path == NULL)
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return TRUE;
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files = fu_path_get_files(esp_path, error);
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if (files == NULL)
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return FALSE;
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/* verify each file does not exist in the ESP */
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for (guint i = 0; i < files->len; i++) {
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const gchar *fn = g_ptr_array_index(files, i);
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g_autofree gchar *checksum = NULL;
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g_autoptr(FuFirmware) img = NULL;
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g_autoptr(GError) error_local = NULL;
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/* get checksum of file */
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checksum = fu_uefi_dbx_get_authenticode_hash(fn, &error_local);
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if (checksum == NULL) {
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g_debug("failed to get checksum for %s: %s", fn, error_local->message);
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continue;
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}
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/* Authenticode signature is present in dbx! */
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g_debug("fn=%s, checksum=%s", fn, checksum);
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img = fu_firmware_get_image_by_checksum(FU_FIRMWARE(siglist), checksum, NULL);
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if (img != NULL) {
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g_set_error(error,
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FWUPD_ERROR,
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FWUPD_ERROR_NEEDS_USER_ACTION,
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"%s Authenticode checksum [%s] is present in dbx",
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fn,
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checksum);
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return FALSE;
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}
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}
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/* success */
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return TRUE;
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}
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gboolean
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fu_uefi_dbx_signature_list_validate(FuContext *ctx, FuEfiSignatureList *siglist, GError **error)
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{
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g_autoptr(GPtrArray) volumes = NULL;
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volumes = fu_context_get_esp_volumes(ctx, error);
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if (volumes == NULL)
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return FALSE;
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for (guint i = 0; i < volumes->len; i++) {
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FuVolume *esp = g_ptr_array_index(volumes, i);
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g_autoptr(FuDeviceLocker) locker = NULL;
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g_autoptr(GError) error_local = NULL;
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locker = fu_volume_locker(esp, &error_local);
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if (locker == NULL) {
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if (!g_error_matches(error_local, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED)) {
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g_propagate_error(error, g_steal_pointer(&error_local));
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return FALSE;
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}
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g_debug("failed to mount ESP: %s", error_local->message);
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continue;
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}
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if (!fu_uefi_dbx_signature_list_validate_volume(siglist, esp, error))
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return FALSE;
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}
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return TRUE;
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}
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