clamav/libclamav/pe.h

/*
 *  Copyright (C) 2015, 2018 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
 *  Copyright (C) 2007-2008 Sourcefire, Inc.
 *
 *  Authors: Alberto Wu, Tomasz Kojm
 * 
 *  Acknowledgements: The header structures were based upon a PE format 
 *                    analysis by B. Luevelsmeyer.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA 02110-1301, USA.
 */

#ifndef __PE_H
#define __PE_H

#include "clamav.h"
#include "execs.h"
#include "others.h"
#include "cltypes.h"
#include "fmap.h"
#include "bcfeatures.h"
/** @file */
/** Header for this PE file
  \group_pe */
struct pe_image_file_hdr {
    uint32_t Magic;  /**< PE magic header: PE\\0\\0 */
    uint16_t Machine;/**< CPU this executable runs on, see libclamav/pe.c for possible values */
    uint16_t NumberOfSections;/**< Number of sections in this executable */
    uint32_t TimeDateStamp;   /**< Unreliable */
    uint32_t PointerToSymbolTable;	    /**< debug */
    uint32_t NumberOfSymbols;		    /**< debug */
    uint16_t SizeOfOptionalHeader;	    /**< == 224 */
    uint16_t Characteristics;
};

/** PE data directory header
  \group_pe */
struct pe_image_data_dir {
    uint32_t VirtualAddress;
    uint32_t Size;
};

/** 32-bit PE optional header
  \group_pe */
struct pe_image_optional_hdr32 {
    uint16_t Magic;
    uint8_t  MajorLinkerVersion;		    /**< unreliable */
    uint8_t  MinorLinkerVersion;		    /**< unreliable */
    uint32_t SizeOfCode;			    /**< unreliable */
    uint32_t SizeOfInitializedData;		    /**< unreliable */
    uint32_t SizeOfUninitializedData;		    /**< unreliable */
    uint32_t AddressOfEntryPoint;
    uint32_t BaseOfCode;
    uint32_t BaseOfData;
    uint32_t ImageBase;				    /**< multiple of 64 KB */
    uint32_t SectionAlignment;			    /**< usually 32 or 4096 */
    uint32_t FileAlignment;			    /**< usually 32 or 512 */
    uint16_t MajorOperatingSystemVersion;	    /**< not used */
    uint16_t MinorOperatingSystemVersion;	    /**< not used */
    uint16_t MajorImageVersion;			    /**< unreliable */
    uint16_t MinorImageVersion;			    /**< unreliable */
    uint16_t MajorSubsystemVersion;
    uint16_t MinorSubsystemVersion;
    uint32_t Win32VersionValue;			    /*< ? */
    uint32_t SizeOfImage;
    uint32_t SizeOfHeaders;
    uint32_t CheckSum;				    /**< NT drivers only */
    uint16_t Subsystem;
    uint16_t DllCharacteristics;
    uint32_t SizeOfStackReserve;
    uint32_t SizeOfStackCommit;
    uint32_t SizeOfHeapReserve;
    uint32_t SizeOfHeapCommit;
    uint32_t LoaderFlags;			    /*< ? */
    uint32_t NumberOfRvaAndSizes;		    /**< unreliable */
    struct pe_image_data_dir DataDirectory[16];
};

/** PE 64-bit optional header
  \group_pe */
struct pe_image_optional_hdr64 {
    uint16_t Magic;
    uint8_t  MajorLinkerVersion;		    /**< unreliable */
    uint8_t  MinorLinkerVersion;		    /**< unreliable */
    uint32_t SizeOfCode;			    /**< unreliable */
    uint32_t SizeOfInitializedData;		    /**< unreliable */
    uint32_t SizeOfUninitializedData;		    /**< unreliable */
    uint32_t AddressOfEntryPoint;
    uint32_t BaseOfCode;
    uint64_t ImageBase;				    /**< multiple of 64 KB */
    uint32_t SectionAlignment;			    /**< usually 32 or 4096 */
    uint32_t FileAlignment;			    /**< usually 32 or 512 */
    uint16_t MajorOperatingSystemVersion;	    /**< not used */
    uint16_t MinorOperatingSystemVersion;	    /**< not used */
    uint16_t MajorImageVersion;			    /**< unreliable */
    uint16_t MinorImageVersion;			    /**< unreliable */
    uint16_t MajorSubsystemVersion;
    uint16_t MinorSubsystemVersion;
    uint32_t Win32VersionValue;			    /* ? */
    uint32_t SizeOfImage;
    uint32_t SizeOfHeaders;
    uint32_t CheckSum;				    /**< NT drivers only */
    uint16_t Subsystem;
    uint16_t DllCharacteristics;
    uint64_t SizeOfStackReserve;
    uint64_t SizeOfStackCommit;
    uint64_t SizeOfHeapReserve;
    uint64_t SizeOfHeapCommit;
    uint32_t LoaderFlags;			    /* ? */
    uint32_t NumberOfRvaAndSizes;		    /**< unreliable */
    struct pe_image_data_dir DataDirectory[16];
};

/** PE section header
  \group_pe */
struct pe_image_section_hdr {
    uint8_t Name[8];			    /**< may not end with NULL */
    /*
    union {
	uint32_t PhysicalAddress;
	uint32_t VirtualSize;
    } AddrSize;
    */
    uint32_t VirtualSize;
    uint32_t VirtualAddress;
    uint32_t SizeOfRawData;		    /**< multiple of FileAlignment */
    uint32_t PointerToRawData;		    /**< offset to the section's data */
    uint32_t PointerToRelocations;	    /**< object files only */
    uint32_t PointerToLinenumbers;	    /**< object files only */
    uint16_t NumberOfRelocations;	    /**< object files only */
    uint16_t NumberOfLinenumbers;	    /**< object files only */
    uint32_t Characteristics;
};

#define WIN_CERT_REV_2 0x0200
#define WIN_CERT_TYPE_PKCS7 0x0002

/** PE authenticode data header
  \group_pe */
struct pe_certificate_hdr {
    uint32_t length; /** length of the certificate data, including the header */
    uint16_t revision;
    uint16_t type;
};

/** Data for the bytecode PE hook
  \group_pe */
struct cli_pe_hook_data {
  uint32_t offset;
  uint32_t ep; /**< EntryPoint as file offset */
  uint16_t nsections;/**< Number of sections */
  uint16_t dummy; /* align */
  struct pe_image_file_hdr file_hdr;/**< Header for this PE file */
  struct pe_image_optional_hdr32 opt32; /**< 32-bit PE optional header */
  uint32_t dummy2; /* align */
  struct pe_image_optional_hdr64 opt64;/**< 64-bit PE optional header */
  struct pe_image_data_dir dirs[16]; /**< PE data directory header */
  uint32_t e_lfanew;/**< address of new exe header */
  uint32_t overlays;/**< number of overlays */
  int32_t overlays_sz;/**< size of overlays */
  uint32_t hdr_size;/**< internally needed by rawaddr */
};

int cli_scanpe(cli_ctx *ctx);

#define CL_CHECKFP_PE_FLAG_NONE             0x00000000
#define CL_CHECKFP_PE_FLAG_STATS            0x00000001
#define CL_CHECKFP_PE_FLAG_AUTHENTICODE     0x00000002

enum {
    CL_GENHASH_PE_CLASS_SECTION,
    CL_GENHASH_PE_CLASS_IMPTBL,
    /* place new class types above this line */
    CL_GENHASH_PE_CLASS_LAST
};

int cli_peheader(fmap_t *map, struct cli_exe_info *peinfo);
int cli_checkfp_pe(cli_ctx *ctx, uint8_t *authsha1, stats_section_t *hashes, uint32_t flags);
int cli_genhash_pe(cli_ctx *ctx, unsigned int class, int type);

uint32_t cli_rawaddr(uint32_t, const struct cli_exe_section *, uint16_t, unsigned int *, size_t, uint32_t);
void findres(uint32_t, uint32_t, uint32_t, fmap_t *map, struct cli_exe_section *, uint16_t, uint32_t, int (*)(void *, uint32_t, uint32_t, uint32_t, uint32_t), void *);

#endif