shim.h

// SPDX-License-Identifier: BSD-2-Clause-Patent

#ifndef SHIM_H_
#define SHIM_H_

#ifdef SHIM_UNIT_TEST
#define _GNU_SOURCE
#endif

#if defined __GNUC__ && defined __GNUC_MINOR__
# define GNUC_PREREQ(maj, min) \
        ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
#else
# define GNUC_PREREQ(maj, min) 0
#endif
#if defined __clang_major__ && defined __clang_minor__
# define CLANG_PREREQ(maj, min) \
  ((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min))
#else
# define CLANG_PREREQ(maj, min) 0
#endif

#if defined(__x86_64__)
/* gcc 4.5.4 is the first documented release with -mabi=ms */
/* gcc 4.7.1 is the first one with __builtin_ms_va_list */
#if !GNUC_PREREQ(4, 7) && !CLANG_PREREQ(3, 4)
#error On x86_64 you must have a compiler new enough to support __attribute__((__ms_abi__))
#endif

#if CLANG_PREREQ(3, 4)
#pragma GCC diagnostic ignored "-Wpointer-bool-conversion"
#endif

#if !defined(GNU_EFI_USE_EXTERNAL_STDARG)
#define GNU_EFI_USE_EXTERNAL_STDARG
#endif

#if !defined(GNU_EFI_USE_MS_ABI)
#define GNU_EFI_USE_MS_ABI
#endif

#ifdef NO_BUILTIN_VA_FUNCS
#undef NO_BUILTIN_VA_FUNCS
#endif
#endif

#include <ctype.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <strings.h>

#ifndef SHIM_UNIT_TEST
#include <efi.h>
#include <efilib.h>
#include <efisetjmp.h>
#undef uefi_call_wrapper
#include <efierr.h>
#include <efiip.h>

#if defined(__x86_64__) && !defined(HAVE_USE_MS_ABI)
#error something has gone wrong with the gnu-efi includes and defines
#endif
#endif

#ifdef SHIM_UNIT_TEST
#include "include/test.h"
#endif

#ifdef __x86_64__
#ifndef DEFAULT_LOADER
#define DEFAULT_LOADER L"\\grubx64.efi"
#endif
#ifndef DEFAULT_LOADER_CHAR
#define DEFAULT_LOADER_CHAR "\\grubx64.efi"
#endif
#ifndef EFI_ARCH
#define EFI_ARCH L"x64"
#endif
#ifndef DEBUGDIR
#define DEBUGDIR L"/usr/lib/debug/usr/share/shim/x64/"
#endif
#endif

#if defined(__i686__) || defined(__i386__)
#ifndef DEFAULT_LOADER
#define DEFAULT_LOADER L"\\grubia32.efi"
#endif
#ifndef DEFAULT_LOADER_CHAR
#define DEFAULT_LOADER_CHAR "\\grubia32.efi"
#endif
#ifndef EFI_ARCH
#define EFI_ARCH L"ia32"
#endif
#ifndef DEBUGDIR
#define DEBUGDIR L"/usr/lib/debug/usr/share/shim/ia32/"
#endif
#endif

#if defined(__aarch64__)
#ifndef DEFAULT_LOADER
#define DEFAULT_LOADER L"\\grubaa64.efi"
#endif
#ifndef DEFAULT_LOADER_CHAR
#define DEFAULT_LOADER_CHAR "\\grubaa64.efi"
#endif
#ifndef EFI_ARCH
#define EFI_ARCH L"aa64"
#endif
#ifndef DEBUGDIR
#define DEBUGDIR L"/usr/lib/debug/usr/share/shim/aa64/"
#endif
#endif

#if defined(__arm__)
#ifndef DEFAULT_LOADER
#define DEFAULT_LOADER L"\\grubarm.efi"
#endif
#ifndef DEFAULT_LOADER_CHAR
#define DEFAULT_LOADER_CHAR "\\grubarm.efi"
#endif
#ifndef EFI_ARCH
#define EFI_ARCH L"arm"
#endif
#ifndef DEBUGDIR
#define DEBUGDIR L"/usr/lib/debug/usr/share/shim/arm/"
#endif
#endif

#ifndef DEBUGSRC
#define DEBUGSRC L"/usr/src/debug/shim-" VERSIONSTR "." EFI_ARCH
#endif

#define FALLBACK L"\\fb" EFI_ARCH L".efi"
#define MOK_MANAGER L"\\mm" EFI_ARCH L".efi"

#if defined(VENDOR_DB_FILE)
# define vendor_authorized vendor_db
# define vendor_authorized_size vendor_db_size
# define vendor_authorized_category VENDOR_ADDEND_DB
#elif defined(VENDOR_CERT_FILE)
# define vendor_authorized vendor_cert
# define vendor_authorized_size vendor_cert_size
# define vendor_authorized_category VENDOR_ADDEND_X509
#else
# define vendor_authorized vendor_null
# define vendor_authorized_size vendor_null_size
# define vendor_authorized_category VENDOR_ADDEND_NONE
#endif

#if defined(VENDOR_DBX_FILE)
# define vendor_deauthorized vendor_dbx
# define vendor_deauthorized_size vendor_dbx_size
#else
# define vendor_deauthorized vendor_deauthorized_null
# define vendor_deauthorized_size vendor_deauthorized_null_size
#endif

#include "include/asm.h"
#include "include/compiler.h"
#include "include/list.h"
#include "include/configtable.h"
#include "include/console.h"
#include "include/crypt_blowfish.h"
#include "include/dp.h"
#include "include/efiauthenticated.h"
#include "include/errors.h"
#include "include/execute.h"
#include "include/guid.h"
#include "include/http.h"
#include "include/httpboot.h"
#include "include/ip4config2.h"
#include "include/ip6config.h"
#include "include/load-options.h"
#include "include/loader-proto.h"
#include "include/mok.h"
#include "include/netboot.h"
#include "include/passwordcrypt.h"
#include "include/peimage.h"
#include "include/pe.h"
#include "include/sbat.h"
#include "include/sbat_var_defs.h"
#include "include/ssp.h"
#if defined(OVERRIDE_SECURITY_POLICY)
#include "include/security_policy.h"
#endif
#include "include/simple_file.h"
#include "include/str.h"
#include "include/tpm.h"
#include "include/utils.h"
#include "include/cc.h"
#include "include/ucs2.h"
#include "include/variables.h"
#include "include/hexdump.h"

#include "version.h"

#ifndef SHIM_UNIT_TEST
#include "Cryptlib/Include/OpenSslSupport.h"
#endif

#define MEM_ATTR_R	4
#define MEM_ATTR_W	2
#define MEM_ATTR_X	1

INTERFACE_DECL(_SHIM_LOCK);

typedef
EFI_STATUS
(*EFI_SHIM_LOCK_VERIFY) (
	IN VOID *buffer,
	IN UINT32 size
	);

typedef
EFI_STATUS
(*EFI_SHIM_LOCK_HASH) (
	IN char *data,
	IN int datasize,
	PE_COFF_LOADER_IMAGE_CONTEXT *context,
	UINT8 *sha256hash,
	UINT8 *sha1hash
	);

typedef
EFI_STATUS
(*EFI_SHIM_LOCK_CONTEXT) (
	IN VOID *data,
	IN unsigned int datasize,
	PE_COFF_LOADER_IMAGE_CONTEXT *context
	);

typedef struct _SHIM_LOCK {
	EFI_SHIM_LOCK_VERIFY Verify;
	EFI_SHIM_LOCK_HASH Hash;
	EFI_SHIM_LOCK_CONTEXT Context;
} SHIM_LOCK;

extern EFI_STATUS shim_init(void);
extern void shim_fini(void);
extern EFI_STATUS EFIAPI LogError_(const char *file, int line, const char *func,
                                   const CHAR16 *fmt, ...);
extern EFI_STATUS EFIAPI VLogError(const char *file, int line, const char *func,
                                   const CHAR16 *fmt, ms_va_list args);
extern VOID LogHexdump_(const char *file, int line, const char *func,
                        const void *data, size_t sz);
extern VOID PrintErrors(VOID);
extern VOID ClearErrors(VOID);
extern VOID restore_loaded_image(VOID);
extern EFI_STATUS start_image(EFI_HANDLE image_handle, CHAR16 *ImagePath);
extern EFI_STATUS import_mok_state(EFI_HANDLE image_handle);
extern EFI_STATUS install_shim_protocols(void);
extern void uninstall_shim_protocols(void);

extern UINT32 vendor_authorized_size;
extern UINT8 *vendor_authorized;

extern UINT32 vendor_deauthorized_size;
extern UINT8 *vendor_deauthorized;

extern UINT32 user_cert_size;
extern UINT8 *user_cert;

#if defined(ENABLE_SHIM_CERT)
extern UINT32 build_cert_size;
extern UINT8 *build_cert;
#endif /* defined(ENABLE_SHIM_CERT) */

extern UINT8 user_insecure_mode;
extern UINT8 ignore_db;
extern UINT8 trust_mok_list;
extern UINT8 mok_policy;

extern UINT8 in_protocol;
extern void *load_options;
extern UINT32 load_options_size;

BOOLEAN secure_mode (void);

EFI_STATUS
verify_buffer (char *data, int datasize,
	       PE_COFF_LOADER_IMAGE_CONTEXT *context,
	       UINT8 *sha256hash, UINT8 *sha1hash);

#ifndef SHIM_UNIT_TEST
#define perror_(file, line, func, fmt, ...) ({					\
		UINTN __perror_ret = 0;						\
		_Static_assert((fmt) != NULL,					\
			       "format specifier cannot be NULL");		\
		if (!in_protocol)						\
			__perror_ret = console_print((fmt), ##__VA_ARGS__);	\
		LogError_(file, line, func, fmt, ##__VA_ARGS__);		\
		__perror_ret;							\
	})
#define perror(fmt, ...) ({							\
		_Static_assert((fmt) != NULL,					\
			       "format specifier cannot be NULL");		\
		perror_(__FILE__, __LINE__ - 1, __func__, fmt, ##__VA_ARGS__);	\
	})
#define LogError(fmt, ...) ({							\
		_Static_assert((fmt) != NULL,					\
			       "format specifier cannot be NULL");		\
		LogError_(__FILE__, __LINE__ - 1, __func__, fmt, ##__VA_ARGS__);\
	})
#else
#define perror(fmt, ...) ({							\
		_Static_assert((fmt) != NULL,					\
			       "format specifier cannot be NULL");		\
	})
#define LogError(fmt, ...) ({							\
		_Static_assert((fmt) != NULL,					\
			       "format specifier cannot be NULL");		\
	})
#endif

#ifdef ENABLE_SHIM_DEVEL
#define FALLBACK_VERBOSE_VAR_NAME L"FALLBACK_DEVEL_VERBOSE"
#define VERBOSE_VAR_NAME L"SHIM_DEVEL_VERBOSE"
#define DEBUG_VAR_NAME L"SHIM_DEVEL_DEBUG"
#else
#define FALLBACK_VERBOSE_VAR_NAME L"FALLBACK_VERBOSE"
#define VERBOSE_VAR_NAME L"SHIM_VERBOSE"
#define DEBUG_VAR_NAME L"SHIM_DEBUG"
#endif

#define SHIM_RETAIN_PROTOCOL_VAR_NAME L"ShimRetainProtocol"

char *translate_slashes(char *out, const char *str);

#include <efisetjmp_arch.h>

typedef struct {
	EFI_LOADED_IMAGE	li;
	EFI_IMAGE_ENTRY_POINT	entry_point;
	EFI_PHYSICAL_ADDRESS	alloc_address;
	UINTN			alloc_pages;
	EFI_STATUS		exit_status;
	CONST CHAR16		*exit_data;
	UINTN			exit_data_size;
	jmp_buf			longjmp_buf;
	BOOLEAN			started;
	EFI_DEVICE_PATH		*loaded_image_device_path;
} SHIM_LOADED_IMAGE;

#endif /* SHIM_H_ */