2018-05-08 06:02:21 +09:00
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// SPDX-License-Identifier: GPL-2.0+
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2016-03-04 09:09:58 +09:00
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/*
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* EFI image loader
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*
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* based partly on wine code
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*
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* Copyright (c) 2016 Alexander Graf
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*/
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#include <common.h>
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2019-11-15 04:57:39 +09:00
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#include <cpu_func.h>
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2016-03-04 09:09:58 +09:00
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#include <efi_loader.h>
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2020-04-14 11:51:44 +09:00
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#include <malloc.h>
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2016-03-04 09:09:58 +09:00
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#include <pe.h>
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2020-04-14 11:51:44 +09:00
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#include <sort.h>
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2020-05-08 00:57:43 +09:00
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#include <crypto/pkcs7_parser.h>
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2020-05-07 09:17:14 +09:00
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#include <linux/err.h>
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2016-03-04 09:09:58 +09:00
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2017-09-14 07:05:38 +09:00
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const efi_guid_t efi_global_variable_guid = EFI_GLOBAL_VARIABLE_GUID;
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2019-04-20 14:39:11 +09:00
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const efi_guid_t efi_guid_device_path = EFI_DEVICE_PATH_PROTOCOL_GUID;
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const efi_guid_t efi_guid_loaded_image = EFI_LOADED_IMAGE_PROTOCOL_GUID;
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const efi_guid_t efi_guid_loaded_image_device_path =
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EFI_LOADED_IMAGE_DEVICE_PATH_PROTOCOL_GUID;
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2017-09-14 07:05:34 +09:00
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const efi_guid_t efi_simple_file_system_protocol_guid =
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EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID;
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const efi_guid_t efi_file_info_guid = EFI_FILE_INFO_GUID;
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2016-03-04 09:09:58 +09:00
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2018-04-06 10:32:06 +09:00
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static int machines[] = {
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2018-06-19 00:22:57 +09:00
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#if defined(__aarch64__)
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2018-04-06 10:32:06 +09:00
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IMAGE_FILE_MACHINE_ARM64,
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2018-06-19 00:22:57 +09:00
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#elif defined(__arm__)
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2018-04-06 10:32:06 +09:00
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IMAGE_FILE_MACHINE_ARM,
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IMAGE_FILE_MACHINE_THUMB,
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IMAGE_FILE_MACHINE_ARMNT,
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#endif
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2018-06-19 00:22:57 +09:00
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#if defined(__x86_64__)
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2018-04-06 10:32:06 +09:00
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IMAGE_FILE_MACHINE_AMD64,
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2018-06-19 00:22:57 +09:00
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#elif defined(__i386__)
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2018-04-06 10:32:06 +09:00
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IMAGE_FILE_MACHINE_I386,
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#endif
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2018-06-19 00:22:57 +09:00
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#if defined(__riscv) && (__riscv_xlen == 32)
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2018-04-06 10:32:06 +09:00
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IMAGE_FILE_MACHINE_RISCV32,
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#endif
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2018-06-19 00:22:57 +09:00
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#if defined(__riscv) && (__riscv_xlen == 64)
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2018-04-06 10:32:06 +09:00
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IMAGE_FILE_MACHINE_RISCV64,
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#endif
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0 };
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2019-02-16 23:22:13 +09:00
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/**
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* efi_print_image_info() - print information about a loaded image
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2018-04-05 18:56:21 +09:00
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*
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* If the program counter is located within the image the offset to the base
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* address is shown.
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*
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2018-09-24 00:21:51 +09:00
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* @obj: EFI object
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2018-04-05 18:56:21 +09:00
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* @image: loaded image
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* @pc: program counter (use NULL to suppress offset output)
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2019-02-16 23:22:13 +09:00
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* Return: status code
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2018-04-05 18:56:21 +09:00
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*/
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2018-09-24 00:21:51 +09:00
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static efi_status_t efi_print_image_info(struct efi_loaded_image_obj *obj,
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struct efi_loaded_image *image,
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void *pc)
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2018-04-05 18:56:21 +09:00
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{
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printf("UEFI image");
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printf(" [0x%p:0x%p]",
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2018-10-11 20:09:58 +09:00
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image->image_base, image->image_base + image->image_size - 1);
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if (pc && pc >= image->image_base &&
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pc < image->image_base + image->image_size)
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printf(" pc=0x%zx", pc - image->image_base);
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2018-04-05 18:56:21 +09:00
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if (image->file_path)
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printf(" '%pD'", image->file_path);
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printf("\n");
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return EFI_SUCCESS;
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}
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2019-02-16 23:22:13 +09:00
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/**
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* efi_print_image_infos() - print information about all loaded images
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2018-04-05 18:56:21 +09:00
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*
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* @pc: program counter (use NULL to suppress offset output)
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*/
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void efi_print_image_infos(void *pc)
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{
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struct efi_object *efiobj;
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struct efi_handler *handler;
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list_for_each_entry(efiobj, &efi_obj_list, link) {
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list_for_each_entry(handler, &efiobj->protocols, link) {
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if (!guidcmp(handler->guid, &efi_guid_loaded_image)) {
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efi_print_image_info(
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2018-09-24 00:21:51 +09:00
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(struct efi_loaded_image_obj *)efiobj,
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2018-04-05 18:56:21 +09:00
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handler->protocol_interface, pc);
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}
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}
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}
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}
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2019-02-16 23:22:13 +09:00
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/**
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* efi_loader_relocate() - relocate UEFI binary
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*
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* @rel: pointer to the relocation table
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* @rel_size: size of the relocation table in bytes
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* @efi_reloc: actual load address of the image
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* @pref_address: preferred load address of the image
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* Return: status code
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*/
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2017-07-04 07:12:58 +09:00
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static efi_status_t efi_loader_relocate(const IMAGE_BASE_RELOCATION *rel,
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2018-05-03 08:36:02 +09:00
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unsigned long rel_size, void *efi_reloc,
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unsigned long pref_address)
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2016-03-04 09:09:58 +09:00
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{
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2018-05-03 08:36:02 +09:00
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unsigned long delta = (unsigned long)efi_reloc - pref_address;
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2016-03-04 09:09:58 +09:00
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const IMAGE_BASE_RELOCATION *end;
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int i;
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2018-05-03 08:36:02 +09:00
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if (delta == 0)
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return EFI_SUCCESS;
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2016-03-04 09:09:58 +09:00
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end = (const IMAGE_BASE_RELOCATION *)((const char *)rel + rel_size);
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2019-02-16 23:36:33 +09:00
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while (rel < end && rel->SizeOfBlock) {
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2016-03-04 09:09:58 +09:00
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const uint16_t *relocs = (const uint16_t *)(rel + 1);
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i = (rel->SizeOfBlock - sizeof(*rel)) / sizeof(uint16_t);
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while (i--) {
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2016-08-19 06:45:18 +09:00
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uint32_t offset = (uint32_t)(*relocs & 0xfff) +
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2016-03-04 09:09:58 +09:00
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rel->VirtualAddress;
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int type = *relocs >> EFI_PAGE_SHIFT;
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uint64_t *x64 = efi_reloc + offset;
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uint32_t *x32 = efi_reloc + offset;
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uint16_t *x16 = efi_reloc + offset;
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switch (type) {
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case IMAGE_REL_BASED_ABSOLUTE:
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break;
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case IMAGE_REL_BASED_HIGH:
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*x16 += ((uint32_t)delta) >> 16;
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break;
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case IMAGE_REL_BASED_LOW:
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*x16 += (uint16_t)delta;
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break;
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case IMAGE_REL_BASED_HIGHLOW:
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*x32 += (uint32_t)delta;
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break;
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case IMAGE_REL_BASED_DIR64:
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*x64 += (uint64_t)delta;
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break;
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2018-06-06 02:20:32 +09:00
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#ifdef __riscv
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case IMAGE_REL_BASED_RISCV_HI20:
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*x32 = ((*x32 & 0xfffff000) + (uint32_t)delta) |
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(*x32 & 0x00000fff);
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break;
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case IMAGE_REL_BASED_RISCV_LOW12I:
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case IMAGE_REL_BASED_RISCV_LOW12S:
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/* We know that we're 4k aligned */
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if (delta & 0xfff) {
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printf("Unsupported reloc offset\n");
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return EFI_LOAD_ERROR;
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}
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break;
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#endif
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2016-03-04 09:09:58 +09:00
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default:
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printf("Unknown Relocation off %x type %x\n",
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offset, type);
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2017-07-04 07:12:58 +09:00
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return EFI_LOAD_ERROR;
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2016-03-04 09:09:58 +09:00
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}
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relocs++;
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}
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rel = (const IMAGE_BASE_RELOCATION *)relocs;
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}
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2017-07-04 07:12:58 +09:00
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return EFI_SUCCESS;
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2016-03-04 09:09:58 +09:00
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}
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void __weak invalidate_icache_all(void)
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{
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/* If the system doesn't support icache_all flush, cross our fingers */
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}
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2019-02-16 23:22:13 +09:00
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/**
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* efi_set_code_and_data_type() - determine the memory types to be used for code
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* and data.
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2018-01-20 04:24:41 +09:00
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*
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2019-02-16 23:22:13 +09:00
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* @loaded_image_info: image descriptor
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* @image_type: field Subsystem of the optional header for
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2018-01-20 04:24:41 +09:00
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* Windows specific field
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*/
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static void efi_set_code_and_data_type(
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struct efi_loaded_image *loaded_image_info,
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uint16_t image_type)
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{
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switch (image_type) {
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case IMAGE_SUBSYSTEM_EFI_APPLICATION:
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loaded_image_info->image_code_type = EFI_LOADER_CODE;
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loaded_image_info->image_data_type = EFI_LOADER_DATA;
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break;
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case IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER:
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loaded_image_info->image_code_type = EFI_BOOT_SERVICES_CODE;
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loaded_image_info->image_data_type = EFI_BOOT_SERVICES_DATA;
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break;
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case IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER:
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2018-02-01 03:45:35 +09:00
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case IMAGE_SUBSYSTEM_EFI_ROM:
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2018-01-20 04:24:41 +09:00
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loaded_image_info->image_code_type = EFI_RUNTIME_SERVICES_CODE;
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loaded_image_info->image_data_type = EFI_RUNTIME_SERVICES_DATA;
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break;
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default:
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printf("%s: invalid image type: %u\n", __func__, image_type);
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/* Let's assume it is an application */
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loaded_image_info->image_code_type = EFI_LOADER_CODE;
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loaded_image_info->image_data_type = EFI_LOADER_DATA;
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break;
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}
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}
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2020-04-14 11:51:44 +09:00
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#ifdef CONFIG_EFI_SECURE_BOOT
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/**
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2020-05-30 13:44:48 +09:00
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* cmp_pe_section() - compare virtual addresses of two PE image sections
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* @arg1: pointer to pointer to first section header
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* @arg2: pointer to pointer to second section header
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2020-04-14 11:51:44 +09:00
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*
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2020-05-30 13:44:48 +09:00
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* Compare the virtual addresses of two sections of an portable executable.
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* The arguments are defined as const void * to allow usage with qsort().
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2020-04-14 11:51:44 +09:00
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*
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2020-05-30 13:44:48 +09:00
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* Return: -1 if the virtual address of arg1 is less than that of arg2,
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* 0 if the virtual addresses are equal, 1 if the virtual address
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* of arg1 is greater than that of arg2.
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2020-04-14 11:51:44 +09:00
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*/
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static int cmp_pe_section(const void *arg1, const void *arg2)
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{
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const IMAGE_SECTION_HEADER *section1, *section2;
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section1 = *((const IMAGE_SECTION_HEADER **)arg1);
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section2 = *((const IMAGE_SECTION_HEADER **)arg2);
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if (section1->VirtualAddress < section2->VirtualAddress)
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return -1;
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else if (section1->VirtualAddress == section2->VirtualAddress)
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return 0;
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else
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return 1;
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}
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/**
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2020-05-30 12:48:08 +09:00
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* efi_image_parse() - parse a PE image
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2020-04-14 11:51:44 +09:00
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* @efi: Pointer to image
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* @len: Size of @efi
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* @regp: Pointer to a list of regions
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* @auth: Pointer to a pointer to authentication data in PE
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* @auth_len: Size of @auth
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*
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* Parse image binary in PE32(+) format, assuming that sanity of PE image
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* has been checked by a caller.
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* On success, an address of authentication data in @efi and its size will
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* be returned in @auth and @auth_len, respectively.
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*
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* Return: true on success, false on error
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*/
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bool efi_image_parse(void *efi, size_t len, struct efi_image_regions **regp,
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WIN_CERTIFICATE **auth, size_t *auth_len)
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{
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struct efi_image_regions *regs;
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IMAGE_DOS_HEADER *dos;
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IMAGE_NT_HEADERS32 *nt;
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IMAGE_SECTION_HEADER *sections, **sorted;
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int num_regions, num_sections, i;
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int ctidx = IMAGE_DIRECTORY_ENTRY_SECURITY;
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u32 align, size, authsz, authoff;
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size_t bytes_hashed;
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dos = (void *)efi;
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nt = (void *)(efi + dos->e_lfanew);
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2020-07-08 14:01:53 +09:00
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authoff = 0;
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authsz = 0;
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2020-04-14 11:51:44 +09:00
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/*
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* Count maximum number of regions to be digested.
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* We don't have to have an exact number here.
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* See efi_image_region_add()'s in parsing below.
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*/
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num_regions = 3; /* for header */
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num_regions += nt->FileHeader.NumberOfSections;
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num_regions++; /* for extra */
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regs = calloc(sizeof(*regs) + sizeof(struct image_region) * num_regions,
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1);
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if (!regs)
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goto err;
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regs->max = num_regions;
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/*
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* Collect data regions for hash calculation
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* 1. File headers
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*/
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if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
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IMAGE_NT_HEADERS64 *nt64 = (void *)nt;
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IMAGE_OPTIONAL_HEADER64 *opt = &nt64->OptionalHeader;
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/* Skip CheckSum */
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efi_image_region_add(regs, efi, &opt->CheckSum, 0);
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if (nt64->OptionalHeader.NumberOfRvaAndSizes <= ctidx) {
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efi_image_region_add(regs,
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2020-05-08 14:51:59 +09:00
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&opt->Subsystem,
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2020-04-14 11:51:44 +09:00
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efi + opt->SizeOfHeaders, 0);
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|
|
} else {
|
|
|
|
/* Skip Certificates Table */
|
|
|
|
efi_image_region_add(regs,
|
2020-05-08 14:51:59 +09:00
|
|
|
&opt->Subsystem,
|
2020-04-14 11:51:44 +09:00
|
|
|
&opt->DataDirectory[ctidx], 0);
|
|
|
|
efi_image_region_add(regs,
|
|
|
|
&opt->DataDirectory[ctidx] + 1,
|
|
|
|
efi + opt->SizeOfHeaders, 0);
|
2020-07-08 14:01:53 +09:00
|
|
|
|
|
|
|
authoff = opt->DataDirectory[ctidx].VirtualAddress;
|
|
|
|
authsz = opt->DataDirectory[ctidx].Size;
|
2020-04-14 11:51:44 +09:00
|
|
|
}
|
|
|
|
|
|
|
|
bytes_hashed = opt->SizeOfHeaders;
|
|
|
|
align = opt->FileAlignment;
|
|
|
|
} else if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
|
|
|
|
IMAGE_OPTIONAL_HEADER32 *opt = &nt->OptionalHeader;
|
|
|
|
|
2020-07-08 14:01:53 +09:00
|
|
|
/* Skip CheckSum */
|
2020-04-14 11:51:44 +09:00
|
|
|
efi_image_region_add(regs, efi, &opt->CheckSum, 0);
|
2020-07-08 14:01:53 +09:00
|
|
|
if (nt->OptionalHeader.NumberOfRvaAndSizes <= ctidx) {
|
|
|
|
efi_image_region_add(regs,
|
|
|
|
&opt->Subsystem,
|
|
|
|
efi + opt->SizeOfHeaders, 0);
|
|
|
|
} else {
|
|
|
|
/* Skip Certificates Table */
|
|
|
|
efi_image_region_add(regs, &opt->Subsystem,
|
|
|
|
&opt->DataDirectory[ctidx], 0);
|
|
|
|
efi_image_region_add(regs,
|
|
|
|
&opt->DataDirectory[ctidx] + 1,
|
|
|
|
efi + opt->SizeOfHeaders, 0);
|
|
|
|
|
|
|
|
authoff = opt->DataDirectory[ctidx].VirtualAddress;
|
|
|
|
authsz = opt->DataDirectory[ctidx].Size;
|
|
|
|
}
|
2020-04-14 11:51:44 +09:00
|
|
|
|
|
|
|
bytes_hashed = opt->SizeOfHeaders;
|
|
|
|
align = opt->FileAlignment;
|
|
|
|
} else {
|
2020-06-09 14:09:35 +09:00
|
|
|
EFI_PRINT("%s: Invalid optional header magic %x\n", __func__,
|
|
|
|
nt->OptionalHeader.Magic);
|
2020-04-14 11:51:44 +09:00
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* 2. Sections */
|
|
|
|
num_sections = nt->FileHeader.NumberOfSections;
|
|
|
|
sections = (void *)((uint8_t *)&nt->OptionalHeader +
|
|
|
|
nt->FileHeader.SizeOfOptionalHeader);
|
|
|
|
sorted = calloc(sizeof(IMAGE_SECTION_HEADER *), num_sections);
|
|
|
|
if (!sorted) {
|
2020-06-09 14:09:35 +09:00
|
|
|
EFI_PRINT("%s: Out of memory\n", __func__);
|
2020-04-14 11:51:44 +09:00
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Make sure the section list is in ascending order.
|
|
|
|
*/
|
|
|
|
for (i = 0; i < num_sections; i++)
|
|
|
|
sorted[i] = §ions[i];
|
|
|
|
qsort(sorted, num_sections, sizeof(sorted[0]), cmp_pe_section);
|
|
|
|
|
|
|
|
for (i = 0; i < num_sections; i++) {
|
|
|
|
if (!sorted[i]->SizeOfRawData)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
size = (sorted[i]->SizeOfRawData + align - 1) & ~(align - 1);
|
|
|
|
efi_image_region_add(regs, efi + sorted[i]->PointerToRawData,
|
|
|
|
efi + sorted[i]->PointerToRawData + size,
|
|
|
|
0);
|
2020-06-09 14:09:35 +09:00
|
|
|
EFI_PRINT("section[%d](%s): raw: 0x%x-0x%x, virt: %x-%x\n",
|
|
|
|
i, sorted[i]->Name,
|
|
|
|
sorted[i]->PointerToRawData,
|
|
|
|
sorted[i]->PointerToRawData + size,
|
|
|
|
sorted[i]->VirtualAddress,
|
|
|
|
sorted[i]->VirtualAddress
|
|
|
|
+ sorted[i]->Misc.VirtualSize);
|
2020-04-14 11:51:44 +09:00
|
|
|
|
|
|
|
bytes_hashed += size;
|
|
|
|
}
|
|
|
|
free(sorted);
|
|
|
|
|
|
|
|
/* 3. Extra data excluding Certificates Table */
|
|
|
|
if (bytes_hashed + authsz < len) {
|
2020-06-09 14:09:35 +09:00
|
|
|
EFI_PRINT("extra data for hash: %lu\n",
|
|
|
|
len - (bytes_hashed + authsz));
|
2020-04-14 11:51:44 +09:00
|
|
|
efi_image_region_add(regs, efi + bytes_hashed,
|
|
|
|
efi + len - authsz, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Return Certificates Table */
|
|
|
|
if (authsz) {
|
|
|
|
if (len < authoff + authsz) {
|
2020-06-09 14:09:35 +09:00
|
|
|
EFI_PRINT("%s: Size for auth too large: %u >= %zu\n",
|
|
|
|
__func__, authsz, len - authoff);
|
2020-04-14 11:51:44 +09:00
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
if (authsz < sizeof(*auth)) {
|
2020-06-09 14:09:35 +09:00
|
|
|
EFI_PRINT("%s: Size for auth too small: %u < %zu\n",
|
|
|
|
__func__, authsz, sizeof(*auth));
|
2020-04-14 11:51:44 +09:00
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
*auth = efi + authoff;
|
|
|
|
*auth_len = authsz;
|
2020-06-09 14:09:35 +09:00
|
|
|
EFI_PRINT("WIN_CERTIFICATE: 0x%x, size: 0x%x\n", authoff,
|
|
|
|
authsz);
|
2020-04-14 11:51:44 +09:00
|
|
|
} else {
|
|
|
|
*auth = NULL;
|
|
|
|
*auth_len = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
*regp = regs;
|
|
|
|
|
|
|
|
return true;
|
|
|
|
|
|
|
|
err:
|
|
|
|
free(regs);
|
|
|
|
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2020-05-30 12:48:08 +09:00
|
|
|
* efi_image_unsigned_authenticate() - authenticate unsigned image with
|
2020-04-14 11:51:44 +09:00
|
|
|
* SHA256 hash
|
|
|
|
* @regs: List of regions to be verified
|
|
|
|
*
|
|
|
|
* If an image is not signed, it doesn't have a signature. In this case,
|
|
|
|
* its message digest is calculated and it will be compared with one of
|
|
|
|
* hash values stored in signature databases.
|
|
|
|
*
|
|
|
|
* Return: true if authenticated, false if not
|
|
|
|
*/
|
|
|
|
static bool efi_image_unsigned_authenticate(struct efi_image_regions *regs)
|
|
|
|
{
|
|
|
|
struct efi_signature_store *db = NULL, *dbx = NULL;
|
|
|
|
bool ret = false;
|
|
|
|
|
|
|
|
dbx = efi_sigstore_parse_sigdb(L"dbx");
|
|
|
|
if (!dbx) {
|
2020-06-09 14:09:35 +09:00
|
|
|
EFI_PRINT("Getting signature database(dbx) failed\n");
|
2020-04-14 11:51:44 +09:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
db = efi_sigstore_parse_sigdb(L"db");
|
|
|
|
if (!db) {
|
2020-06-09 14:09:35 +09:00
|
|
|
EFI_PRINT("Getting signature database(db) failed\n");
|
2020-04-14 11:51:44 +09:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* try black-list first */
|
2020-07-08 14:01:57 +09:00
|
|
|
if (efi_signature_lookup_digest(regs, dbx)) {
|
|
|
|
EFI_PRINT("Image is not signed and its digest found in \"dbx\"\n");
|
2020-04-14 11:51:44 +09:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* try white-list */
|
2020-07-08 14:01:57 +09:00
|
|
|
if (efi_signature_lookup_digest(regs, db))
|
2020-04-14 11:51:44 +09:00
|
|
|
ret = true;
|
|
|
|
else
|
2020-07-08 14:01:57 +09:00
|
|
|
EFI_PRINT("Image is not signed and its digest not found in \"db\" or \"dbx\"\n");
|
2020-04-14 11:51:44 +09:00
|
|
|
|
|
|
|
out:
|
|
|
|
efi_sigstore_free(db);
|
|
|
|
efi_sigstore_free(dbx);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2020-05-30 12:48:08 +09:00
|
|
|
* efi_image_authenticate() - verify a signature of signed image
|
2020-04-14 11:51:44 +09:00
|
|
|
* @efi: Pointer to image
|
|
|
|
* @efi_size: Size of @efi
|
|
|
|
*
|
|
|
|
* A signed image should have its signature stored in a table of its PE header.
|
|
|
|
* So if an image is signed and only if if its signature is verified using
|
|
|
|
* signature databases, an image is authenticated.
|
|
|
|
* If an image is not signed, its validity is checked by using
|
|
|
|
* efi_image_unsigned_authenticated().
|
|
|
|
* TODO:
|
|
|
|
* When AuditMode==0, if the image's signature is not found in
|
|
|
|
* the authorized database, or is found in the forbidden database,
|
|
|
|
* the image will not be started and instead, information about it
|
|
|
|
* will be placed in this table.
|
|
|
|
* When AuditMode==1, an EFI_IMAGE_EXECUTION_INFO element is created
|
|
|
|
* in the EFI_IMAGE_EXECUTION_INFO_TABLE for every certificate found
|
|
|
|
* in the certificate table of every image that is validated.
|
|
|
|
*
|
|
|
|
* Return: true if authenticated, false if not
|
|
|
|
*/
|
|
|
|
static bool efi_image_authenticate(void *efi, size_t efi_size)
|
|
|
|
{
|
|
|
|
struct efi_image_regions *regs = NULL;
|
|
|
|
WIN_CERTIFICATE *wincerts = NULL, *wincert;
|
|
|
|
size_t wincerts_len;
|
|
|
|
struct pkcs7_message *msg = NULL;
|
|
|
|
struct efi_signature_store *db = NULL, *dbx = NULL;
|
|
|
|
void *new_efi = NULL;
|
2020-07-08 14:01:52 +09:00
|
|
|
u8 *auth, *wincerts_end;
|
|
|
|
size_t new_efi_size, auth_size;
|
2020-04-14 11:51:44 +09:00
|
|
|
bool ret = false;
|
|
|
|
|
2020-07-08 14:01:56 +09:00
|
|
|
debug("%s: Enter, %d\n", __func__, ret);
|
|
|
|
|
2020-04-14 11:51:44 +09:00
|
|
|
if (!efi_secure_boot_enabled())
|
|
|
|
return true;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Size must be 8-byte aligned and the trailing bytes must be
|
|
|
|
* zero'ed. Otherwise hash value may be incorrect.
|
|
|
|
*/
|
|
|
|
if (efi_size & 0x7) {
|
|
|
|
new_efi_size = (efi_size + 0x7) & ~0x7ULL;
|
|
|
|
new_efi = calloc(new_efi_size, 1);
|
|
|
|
if (!new_efi)
|
|
|
|
return false;
|
|
|
|
memcpy(new_efi, efi, efi_size);
|
|
|
|
efi = new_efi;
|
|
|
|
efi_size = new_efi_size;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!efi_image_parse(efi, efi_size, ®s, &wincerts,
|
|
|
|
&wincerts_len)) {
|
2020-06-09 14:09:35 +09:00
|
|
|
EFI_PRINT("Parsing PE executable image failed\n");
|
2020-04-14 11:51:44 +09:00
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!wincerts) {
|
|
|
|
/* The image is not signed */
|
|
|
|
ret = efi_image_unsigned_authenticate(regs);
|
|
|
|
|
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* verify signature using db and dbx
|
|
|
|
*/
|
|
|
|
db = efi_sigstore_parse_sigdb(L"db");
|
|
|
|
if (!db) {
|
2020-06-09 14:09:35 +09:00
|
|
|
EFI_PRINT("Getting signature database(db) failed\n");
|
2020-04-14 11:51:44 +09:00
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
|
|
|
dbx = efi_sigstore_parse_sigdb(L"dbx");
|
|
|
|
if (!dbx) {
|
2020-06-09 14:09:35 +09:00
|
|
|
EFI_PRINT("Getting signature database(dbx) failed\n");
|
2020-04-14 11:51:44 +09:00
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
2020-07-08 14:01:56 +09:00
|
|
|
/*
|
|
|
|
* go through WIN_CERTIFICATE list
|
|
|
|
* NOTE:
|
|
|
|
* We may have multiple signatures either as WIN_CERTIFICATE's
|
|
|
|
* in PE header, or as pkcs7 SignerInfo's in SignedData.
|
|
|
|
* So the verification policy here is:
|
|
|
|
* - Success if, at least, one of signatures is verified
|
|
|
|
* - unless
|
|
|
|
* any of signatures is rejected explicitly, or
|
|
|
|
* none of digest algorithms are supported
|
|
|
|
*/
|
2020-07-08 14:01:52 +09:00
|
|
|
for (wincert = wincerts, wincerts_end = (u8 *)wincerts + wincerts_len;
|
|
|
|
(u8 *)wincert < wincerts_end;
|
|
|
|
wincert = (WIN_CERTIFICATE *)
|
|
|
|
((u8 *)wincert + ALIGN(wincert->dwLength, 8))) {
|
|
|
|
if ((u8 *)wincert + sizeof(*wincert) >= wincerts_end)
|
|
|
|
break;
|
|
|
|
|
|
|
|
if (wincert->dwLength <= sizeof(*wincert)) {
|
|
|
|
EFI_PRINT("dwLength too small: %u < %zu\n",
|
|
|
|
wincert->dwLength, sizeof(*wincert));
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
EFI_PRINT("WIN_CERTIFICATE_TYPE: 0x%x\n",
|
|
|
|
wincert->wCertificateType);
|
|
|
|
|
|
|
|
auth = (u8 *)wincert + sizeof(*wincert);
|
|
|
|
auth_size = wincert->dwLength - sizeof(*wincert);
|
|
|
|
if (wincert->wCertificateType == WIN_CERT_TYPE_EFI_GUID) {
|
|
|
|
if (auth + sizeof(efi_guid_t) >= wincerts_end)
|
|
|
|
break;
|
|
|
|
|
|
|
|
if (auth_size <= sizeof(efi_guid_t)) {
|
|
|
|
EFI_PRINT("dwLength too small: %u < %zu\n",
|
|
|
|
wincert->dwLength, sizeof(*wincert));
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
if (guidcmp(auth, &efi_guid_cert_type_pkcs7)) {
|
|
|
|
EFI_PRINT("Certificate type not supported: %pUl\n",
|
|
|
|
auth);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
auth += sizeof(efi_guid_t);
|
|
|
|
auth_size -= sizeof(efi_guid_t);
|
|
|
|
} else if (wincert->wCertificateType
|
|
|
|
!= WIN_CERT_TYPE_PKCS_SIGNED_DATA) {
|
|
|
|
EFI_PRINT("Certificate type not supported\n");
|
|
|
|
continue;
|
2020-04-14 11:51:44 +09:00
|
|
|
}
|
2020-07-08 14:01:52 +09:00
|
|
|
|
|
|
|
msg = pkcs7_parse_message(auth, auth_size);
|
2020-05-07 09:17:14 +09:00
|
|
|
if (IS_ERR(msg)) {
|
2020-06-09 14:09:35 +09:00
|
|
|
EFI_PRINT("Parsing image's signature failed\n");
|
2020-05-07 09:17:14 +09:00
|
|
|
msg = NULL;
|
2020-07-08 14:01:52 +09:00
|
|
|
continue;
|
2020-04-14 11:51:44 +09:00
|
|
|
}
|
|
|
|
|
2020-07-08 14:01:57 +09:00
|
|
|
/*
|
|
|
|
* NOTE:
|
|
|
|
* UEFI specification defines two signature types possible
|
|
|
|
* in signature database:
|
|
|
|
* a. x509 certificate, where a signature in image is
|
|
|
|
* a message digest encrypted by RSA public key
|
|
|
|
* (EFI_CERT_X509_GUID)
|
|
|
|
* b. bare hash value of message digest
|
|
|
|
* (EFI_CERT_SHAxxx_GUID)
|
|
|
|
*
|
|
|
|
* efi_signature_verify() handles case (a), while
|
|
|
|
* efi_signature_lookup_digest() handles case (b).
|
|
|
|
*
|
|
|
|
* There is a third type:
|
|
|
|
* c. message digest of a certificate
|
|
|
|
* (EFI_CERT_X509_SHAAxxx_GUID)
|
|
|
|
* This type of signature is used only in revocation list
|
|
|
|
* (dbx) and handled as part of efi_signatgure_verify().
|
|
|
|
*/
|
2020-04-14 11:51:44 +09:00
|
|
|
/* try black-list first */
|
2020-07-08 14:01:56 +09:00
|
|
|
if (efi_signature_verify_one(regs, msg, dbx)) {
|
2020-06-09 14:09:35 +09:00
|
|
|
EFI_PRINT("Signature was rejected by \"dbx\"\n");
|
2020-04-14 11:51:44 +09:00
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
2020-07-08 14:01:56 +09:00
|
|
|
if (!efi_signature_check_signers(msg, dbx)) {
|
|
|
|
EFI_PRINT("Signer(s) in \"dbx\"\n");
|
2020-04-14 11:51:44 +09:00
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
2020-07-08 14:01:57 +09:00
|
|
|
if (efi_signature_lookup_digest(regs, dbx)) {
|
|
|
|
EFI_PRINT("Image's digest was found in \"dbx\"\n");
|
2020-04-14 11:51:44 +09:00
|
|
|
goto err;
|
|
|
|
}
|
2020-07-08 14:01:57 +09:00
|
|
|
|
|
|
|
/* try white-list */
|
|
|
|
if (efi_signature_verify_with_sigdb(regs, msg, db, dbx))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
debug("Signature was not verified by \"db\"\n");
|
|
|
|
|
|
|
|
if (efi_signature_lookup_digest(regs, db))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
debug("Image's digest was not found in \"db\" or \"dbx\"\n");
|
|
|
|
goto err;
|
2020-04-14 11:51:44 +09:00
|
|
|
}
|
2020-07-08 14:01:56 +09:00
|
|
|
ret = true;
|
2020-04-14 11:51:44 +09:00
|
|
|
|
|
|
|
err:
|
|
|
|
efi_sigstore_free(db);
|
|
|
|
efi_sigstore_free(dbx);
|
|
|
|
pkcs7_free_message(msg);
|
|
|
|
free(regs);
|
|
|
|
free(new_efi);
|
|
|
|
|
2020-07-08 14:01:56 +09:00
|
|
|
debug("%s: Exit, %d\n", __func__, ret);
|
2020-04-14 11:51:44 +09:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
static bool efi_image_authenticate(void *efi, size_t efi_size)
|
|
|
|
{
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_EFI_SECURE_BOOT */
|
|
|
|
|
2018-12-26 20:49:09 +09:00
|
|
|
/**
|
|
|
|
* efi_load_pe() - relocate EFI binary
|
|
|
|
*
|
2016-03-04 09:09:58 +09:00
|
|
|
* This function loads all sections from a PE binary into a newly reserved
|
2018-12-26 20:49:09 +09:00
|
|
|
* piece of memory. On success the entry point is returned as handle->entry.
|
|
|
|
*
|
|
|
|
* @handle: loaded image handle
|
|
|
|
* @efi: pointer to the EFI binary
|
2020-04-14 11:51:44 +09:00
|
|
|
* @efi_size: size of @efi binary
|
2018-12-26 20:49:09 +09:00
|
|
|
* @loaded_image_info: loaded image protocol
|
|
|
|
* Return: status code
|
2016-03-04 09:09:58 +09:00
|
|
|
*/
|
2020-04-14 11:51:44 +09:00
|
|
|
efi_status_t efi_load_pe(struct efi_loaded_image_obj *handle,
|
|
|
|
void *efi, size_t efi_size,
|
2018-12-26 20:49:09 +09:00
|
|
|
struct efi_loaded_image *loaded_image_info)
|
2016-03-04 09:09:58 +09:00
|
|
|
{
|
|
|
|
IMAGE_NT_HEADERS32 *nt;
|
|
|
|
IMAGE_DOS_HEADER *dos;
|
|
|
|
IMAGE_SECTION_HEADER *sections;
|
|
|
|
int num_sections;
|
|
|
|
void *efi_reloc;
|
|
|
|
int i;
|
|
|
|
const IMAGE_BASE_RELOCATION *rel;
|
|
|
|
unsigned long rel_size;
|
|
|
|
int rel_idx = IMAGE_DIRECTORY_ENTRY_BASERELOC;
|
2018-05-03 08:36:02 +09:00
|
|
|
uint64_t image_base;
|
2016-03-04 09:09:58 +09:00
|
|
|
unsigned long virt_size = 0;
|
2018-04-06 10:32:06 +09:00
|
|
|
int supported = 0;
|
2020-04-14 11:51:44 +09:00
|
|
|
efi_status_t ret;
|
|
|
|
|
|
|
|
/* Sanity check for a file header */
|
|
|
|
if (efi_size < sizeof(*dos)) {
|
|
|
|
printf("%s: Truncated DOS Header\n", __func__);
|
|
|
|
ret = EFI_LOAD_ERROR;
|
|
|
|
goto err;
|
|
|
|
}
|
2016-03-04 09:09:58 +09:00
|
|
|
|
|
|
|
dos = efi;
|
|
|
|
if (dos->e_magic != IMAGE_DOS_SIGNATURE) {
|
|
|
|
printf("%s: Invalid DOS Signature\n", __func__);
|
2020-04-14 11:51:44 +09:00
|
|
|
ret = EFI_LOAD_ERROR;
|
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
2020-05-30 14:35:59 +09:00
|
|
|
/*
|
|
|
|
* Check if the image section header fits into the file. Knowing that at
|
|
|
|
* least one section header follows we only need to check for the length
|
|
|
|
* of the 64bit header which is longer than the 32bit header.
|
|
|
|
*/
|
|
|
|
if (efi_size < dos->e_lfanew + sizeof(IMAGE_NT_HEADERS64)) {
|
2020-04-14 11:51:44 +09:00
|
|
|
printf("%s: Invalid offset for Extended Header\n", __func__);
|
|
|
|
ret = EFI_LOAD_ERROR;
|
|
|
|
goto err;
|
2016-03-04 09:09:58 +09:00
|
|
|
}
|
|
|
|
|
|
|
|
nt = (void *) ((char *)efi + dos->e_lfanew);
|
|
|
|
if (nt->Signature != IMAGE_NT_SIGNATURE) {
|
|
|
|
printf("%s: Invalid NT Signature\n", __func__);
|
2020-04-14 11:51:44 +09:00
|
|
|
ret = EFI_LOAD_ERROR;
|
|
|
|
goto err;
|
2016-03-04 09:09:58 +09:00
|
|
|
}
|
|
|
|
|
2018-04-06 10:32:06 +09:00
|
|
|
for (i = 0; machines[i]; i++)
|
|
|
|
if (machines[i] == nt->FileHeader.Machine) {
|
|
|
|
supported = 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!supported) {
|
|
|
|
printf("%s: Machine type 0x%04x is not supported\n",
|
|
|
|
__func__, nt->FileHeader.Machine);
|
2020-04-14 11:51:44 +09:00
|
|
|
ret = EFI_LOAD_ERROR;
|
|
|
|
goto err;
|
2018-04-06 10:32:06 +09:00
|
|
|
}
|
|
|
|
|
2016-03-04 09:09:58 +09:00
|
|
|
num_sections = nt->FileHeader.NumberOfSections;
|
|
|
|
sections = (void *)&nt->OptionalHeader +
|
|
|
|
nt->FileHeader.SizeOfOptionalHeader;
|
|
|
|
|
2020-04-14 11:51:44 +09:00
|
|
|
if (efi_size < ((void *)sections + sizeof(sections[0]) * num_sections
|
|
|
|
- efi)) {
|
|
|
|
printf("%s: Invalid number of sections: %d\n",
|
|
|
|
__func__, num_sections);
|
|
|
|
ret = EFI_LOAD_ERROR;
|
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Authenticate an image */
|
|
|
|
if (efi_image_authenticate(efi, efi_size))
|
|
|
|
handle->auth_status = EFI_IMAGE_AUTH_PASSED;
|
|
|
|
else
|
|
|
|
handle->auth_status = EFI_IMAGE_AUTH_FAILED;
|
|
|
|
|
|
|
|
/* Calculate upper virtual address boundary */
|
2016-03-04 09:09:58 +09:00
|
|
|
for (i = num_sections - 1; i >= 0; i--) {
|
|
|
|
IMAGE_SECTION_HEADER *sec = §ions[i];
|
|
|
|
virt_size = max_t(unsigned long, virt_size,
|
|
|
|
sec->VirtualAddress + sec->Misc.VirtualSize);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Read 32/64bit specific header bits */
|
2018-04-06 10:32:06 +09:00
|
|
|
if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
|
2016-03-04 09:09:58 +09:00
|
|
|
IMAGE_NT_HEADERS64 *nt64 = (void *)nt;
|
|
|
|
IMAGE_OPTIONAL_HEADER64 *opt = &nt64->OptionalHeader;
|
2018-05-03 08:36:02 +09:00
|
|
|
image_base = opt->ImageBase;
|
2018-01-20 04:24:41 +09:00
|
|
|
efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);
|
2019-05-02 03:07:04 +09:00
|
|
|
handle->image_type = opt->Subsystem;
|
2018-01-20 04:24:41 +09:00
|
|
|
efi_reloc = efi_alloc(virt_size,
|
|
|
|
loaded_image_info->image_code_type);
|
2016-03-04 09:09:58 +09:00
|
|
|
if (!efi_reloc) {
|
2017-12-23 03:16:57 +09:00
|
|
|
printf("%s: Could not allocate %lu bytes\n",
|
|
|
|
__func__, virt_size);
|
2020-04-14 11:51:44 +09:00
|
|
|
ret = EFI_OUT_OF_RESOURCES;
|
|
|
|
goto err;
|
2016-03-04 09:09:58 +09:00
|
|
|
}
|
2018-12-26 20:49:09 +09:00
|
|
|
handle->entry = efi_reloc + opt->AddressOfEntryPoint;
|
2016-03-04 09:09:58 +09:00
|
|
|
rel_size = opt->DataDirectory[rel_idx].Size;
|
|
|
|
rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress;
|
2018-04-04 05:29:32 +09:00
|
|
|
virt_size = ALIGN(virt_size, opt->SectionAlignment);
|
2018-04-06 10:32:06 +09:00
|
|
|
} else if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
|
2016-03-04 09:09:58 +09:00
|
|
|
IMAGE_OPTIONAL_HEADER32 *opt = &nt->OptionalHeader;
|
2018-05-03 08:36:02 +09:00
|
|
|
image_base = opt->ImageBase;
|
2018-01-20 04:24:41 +09:00
|
|
|
efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);
|
2019-05-02 03:07:04 +09:00
|
|
|
handle->image_type = opt->Subsystem;
|
2018-01-20 04:24:41 +09:00
|
|
|
efi_reloc = efi_alloc(virt_size,
|
|
|
|
loaded_image_info->image_code_type);
|
2016-03-04 09:09:58 +09:00
|
|
|
if (!efi_reloc) {
|
2017-12-23 03:16:57 +09:00
|
|
|
printf("%s: Could not allocate %lu bytes\n",
|
|
|
|
__func__, virt_size);
|
2020-04-14 11:51:44 +09:00
|
|
|
ret = EFI_OUT_OF_RESOURCES;
|
|
|
|
goto err;
|
2016-03-04 09:09:58 +09:00
|
|
|
}
|
2018-12-26 20:49:09 +09:00
|
|
|
handle->entry = efi_reloc + opt->AddressOfEntryPoint;
|
2016-03-04 09:09:58 +09:00
|
|
|
rel_size = opt->DataDirectory[rel_idx].Size;
|
|
|
|
rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress;
|
2018-04-04 05:29:32 +09:00
|
|
|
virt_size = ALIGN(virt_size, opt->SectionAlignment);
|
2016-03-04 09:09:58 +09:00
|
|
|
} else {
|
|
|
|
printf("%s: Invalid optional header magic %x\n", __func__,
|
|
|
|
nt->OptionalHeader.Magic);
|
2020-04-14 11:51:44 +09:00
|
|
|
ret = EFI_LOAD_ERROR;
|
|
|
|
goto err;
|
2016-03-04 09:09:58 +09:00
|
|
|
}
|
|
|
|
|
2018-10-11 20:09:58 +09:00
|
|
|
/* Copy PE headers */
|
2020-04-14 11:51:44 +09:00
|
|
|
memcpy(efi_reloc, efi,
|
|
|
|
sizeof(*dos)
|
|
|
|
+ sizeof(*nt)
|
|
|
|
+ nt->FileHeader.SizeOfOptionalHeader
|
|
|
|
+ num_sections * sizeof(IMAGE_SECTION_HEADER));
|
2018-10-11 20:09:58 +09:00
|
|
|
|
2016-03-04 09:09:58 +09:00
|
|
|
/* Load sections into RAM */
|
|
|
|
for (i = num_sections - 1; i >= 0; i--) {
|
|
|
|
IMAGE_SECTION_HEADER *sec = §ions[i];
|
|
|
|
memset(efi_reloc + sec->VirtualAddress, 0,
|
|
|
|
sec->Misc.VirtualSize);
|
|
|
|
memcpy(efi_reloc + sec->VirtualAddress,
|
|
|
|
efi + sec->PointerToRawData,
|
|
|
|
sec->SizeOfRawData);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Run through relocations */
|
2018-05-03 08:36:02 +09:00
|
|
|
if (efi_loader_relocate(rel, rel_size, efi_reloc,
|
|
|
|
(unsigned long)image_base) != EFI_SUCCESS) {
|
2017-07-04 07:12:58 +09:00
|
|
|
efi_free_pages((uintptr_t) efi_reloc,
|
|
|
|
(virt_size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT);
|
2020-04-14 11:51:44 +09:00
|
|
|
ret = EFI_LOAD_ERROR;
|
|
|
|
goto err;
|
2017-07-04 07:12:58 +09:00
|
|
|
}
|
2016-03-04 09:09:58 +09:00
|
|
|
|
|
|
|
/* Flush cache */
|
2016-11-08 00:47:04 +09:00
|
|
|
flush_cache((ulong)efi_reloc,
|
2018-04-23 14:59:47 +09:00
|
|
|
ALIGN(virt_size, EFI_CACHELINE_SIZE));
|
2016-03-04 09:09:58 +09:00
|
|
|
invalidate_icache_all();
|
|
|
|
|
|
|
|
/* Populate the loaded image interface bits */
|
2018-10-11 20:09:58 +09:00
|
|
|
loaded_image_info->image_base = efi_reloc;
|
|
|
|
loaded_image_info->image_size = virt_size;
|
2016-03-04 09:09:58 +09:00
|
|
|
|
2020-04-14 11:51:44 +09:00
|
|
|
if (handle->auth_status == EFI_IMAGE_AUTH_PASSED)
|
|
|
|
return EFI_SUCCESS;
|
|
|
|
else
|
|
|
|
return EFI_SECURITY_VIOLATION;
|
|
|
|
|
|
|
|
err:
|
|
|
|
return ret;
|
2016-03-04 09:09:58 +09:00
|
|
|
}
|