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elfbin.py
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elfbin.py
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#!/usr/bin/env python
import struct
import os
import sys
import shutil
from elf_helper import *
class elf():
"""
ELF data format class for BackdoorFactory.
We don't need the ENTIRE format.
"""
#setting linux header infomation
e_ident = {"EI_MAG": "\x7f" + "ELF",
"EI_CLASS": {0x01: "x86",
0x02: "x64"
},
"EI_DATA_little": 0x01,
"EI_DATA_big": 0x02,
"EI_VERSION": 0x01,
"EI_OSABI": {0x00: "System V",
0x01: "HP-UX",
0x02: "NetBSD",
0x03: "Linux",
0x06: "Solaris",
0x07: "AIX",
0x08: "IRIX",
0x09: "FreeBSD",
0x0C: "OpenBSD"
},
"EI_ABIVERSION": 0x00,
"EI_PAD": 0x07
}
e_type = {0x01: "relocatable",
0x02: "executable",
0x03: "shared",
0x04: "core"
}
e_machine = {0x02: "SPARC",
0x03: "x86",
0x14: "PowerPC",
0x28: "ARM",
0x32: "IA-64",
0x3E: "x86-64",
0xB7: "AArch64"
}
e_version = 0x01
#end elf class
class elfbin():
"""
This is the class handler for the elf binary format
"""
def __init__(self, FILE):
self.FILE = FILE
self.bin_file = open(self.FILE, "r+b")
self.text_section = -1
self.gather_file_info()
def get_section_name(self, section_offset):
'''
Get section names
'''
self.bin_file.seek(self.sec_hdr[self.e_shstrndx]['sh_offset']+section_offset,0)
name = ''
j = ''
while True:
j = self.bin_file.read(1)
if hex(ord(j)) == '0x0':
break
else:
name += j
#print "name:", name
return name
def set_section_name(self):
'''
Set the section names
'''
#how to find name section specifically
for i in range(0, self.e_shstrndx+1):
self.sec_hdr[i]['name'] = self.get_section_name(self.sec_hdr[i]['sh_name'])
if self.sec_hdr[i]['name'] == ".text":
#print "Found text section"
self.text_section = i
def get_section_offset(self,secname):
for i in range(self.e_shnum):
if self.sec_hdr[i]['name'] == ".text":
return self.sec_hdr[i]['sh_offset']
return None
def gather_file_info(self):
'''
Gather info about the binary
'''
print "[*] Gathering file info"
bin = self.bin_file
bin.seek(0)
EI_MAG = bin.read(4)
self.EI_CLASS = struct.unpack("<B", bin.read(1))[0]
self.EI_DATA = struct.unpack("<B", bin.read(1))[0]
if self.EI_DATA == 0x01:
#little endian
self.endian = "<"
else:
#big self.endian
self.endian = ">"
self.EI_VERSION = bin.read(1)
self.EI_OSABI = bin.read(1)
self.EI_ABIVERSION = bin.read(1)
self.EI_PAD = struct.unpack("<BBBBBBB", bin.read(7))[0]
self.e_type = struct.unpack("<H", bin.read(2))[0]
self.e_machine = struct.unpack(self.endian + "H", bin.read(2))[0]
self.e_version = struct.unpack(self.endian + "I", bin.read(4))[0]
#print "EI_Class", self.EI_CLASS
if self.EI_CLASS == 0x01:
#print "32 bit D:"
self.e_entryLocOnDisk = bin.tell()
self.e_entry = struct.unpack(self.endian + "I", bin.read(4))[0]
#print hex(self.e_entry)
self.e_phoff = struct.unpack(self.endian + "I", bin.read(4))[0]
self.e_shoff = struct.unpack(self.endian + "I", bin.read(4))[0]
else:
#print "64 bit B:"
self.e_entryLocOnDisk = bin.tell()
self.e_entry = struct.unpack(self.endian + "Q", bin.read(8))[0]
self.e_phoff = struct.unpack(self.endian + "Q", bin.read(8))[0]
self.e_shoff = struct.unpack(self.endian + "Q", bin.read(8))[0]
#print hex(self.e_entry)
#print "e_phoff", self.e_phoff
#print "e_shoff", self.e_shoff
self.VrtStrtngPnt = self.e_entry
self.e_flags = struct.unpack(self.endian + "I", bin.read(4))[0]
self.e_ehsize = struct.unpack(self.endian + "H", bin.read(2))[0]
self.e_phentsize = struct.unpack(self.endian + "H", bin.read(2))[0]
self.e_phnum = struct.unpack(self.endian + "H", bin.read(2))[0]
self.e_shentsize = struct.unpack(self.endian + "H", bin.read(2))[0]
self.e_shnum = struct.unpack(self.endian + "H", bin.read(2))[0]
self.e_shstrndx = struct.unpack(self.endian + "H", bin.read(2))[0]
#self.e_version'] = struct.e_entry
#section tables
bin.seek(self.e_phoff,0)
#header tables
if self.e_shnum == 0:
print "more than 0xFF00 sections, wtf?"
#print "real number of section header table entries"
#print "in sh_size."
self.real_num_sections = self.sh_size
else:
#print "less than 0xFF00 sections, yay"
self.real_num_sections = self.e_shnum
#print "real_num_sections", self.real_num_sections
bin.seek(self.e_phoff,0)
self.prog_hdr = {}
#print 'e_phnum', self.e_phnum
for i in range(self.e_phnum):
#print "i check e_phnum", i
self.prog_hdr[i] = {}
if self.EI_CLASS == 0x01:
self.prog_hdr[i]['p_type'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.prog_hdr[i]['p_offset'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.prog_hdr[i]['p_vaddr'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.prog_hdr[i]['p_paddr'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.prog_hdr[i]['p_filesz'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.prog_hdr[i]['p_memsz'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.prog_hdr[i]['p_flags'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.prog_hdr[i]['p_align'] = struct.unpack(self.endian + "I", bin.read(4))[0]
else:
self.prog_hdr[i]['p_type'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.prog_hdr[i]['p_flags'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.prog_hdr[i]['p_offset'] = struct.unpack(self.endian + "Q", bin.read(8))[0]
self.prog_hdr[i]['p_vaddr'] = struct.unpack(self.endian + "Q", bin.read(8))[0]
self.prog_hdr[i]['p_paddr'] = struct.unpack(self.endian + "Q", bin.read(8))[0]
self.prog_hdr[i]['p_filesz'] = struct.unpack(self.endian + "Q", bin.read(8))[0]
self.prog_hdr[i]['p_memsz'] = struct.unpack(self.endian + "Q", bin.read(8))[0]
self.prog_hdr[i]['p_align'] = struct.unpack(self.endian + "Q", bin.read(8))[0]
if self.prog_hdr[i]['p_type'] == 0x1 and self.prog_hdr[i]['p_vaddr'] < self.e_entry:
self.offset_addr = self.prog_hdr[i]['p_vaddr']
self.LocOfEntryinCode = self.e_entry - self.offset_addr
#print "found the entry offset"
bin.seek(self.e_shoff, 0)
self.sec_hdr = {}
for i in range(self.e_shnum):
self.sec_hdr[i] = {}
if self.EI_CLASS == 0x01:
self.sec_hdr[i]['sh_name'] = struct.unpack(self.endian + "I", bin.read(4))[0]
#print self.sec_hdr[i]['sh_name']
self.sec_hdr[i]['sh_type'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.sec_hdr[i]['sh_flags'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.sec_hdr[i]['sh_addr'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.sec_hdr[i]['sh_offset'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.sec_hdr[i]['sh_size'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.sec_hdr[i]['sh_link'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.sec_hdr[i]['sh_info'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.sec_hdr[i]['sh_addralign'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.sec_hdr[i]['sh_entsize'] = struct.unpack(self.endian + "I", bin.read(4))[0]
else:
self.sec_hdr[i]['sh_name'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.sec_hdr[i]['sh_type'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.sec_hdr[i]['sh_flags'] = struct.unpack(self.endian + "Q", bin.read(8))[0]
self.sec_hdr[i]['sh_addr'] = struct.unpack(self.endian + "Q", bin.read(8))[0]
self.sec_hdr[i]['sh_offset'] = struct.unpack(self.endian + "Q", bin.read(8))[0]
self.sec_hdr[i]['sh_size'] = struct.unpack(self.endian + "Q", bin.read(8))[0]
self.sec_hdr[i]['sh_link'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.sec_hdr[i]['sh_info'] = struct.unpack(self.endian + "I", bin.read(4))[0]
self.sec_hdr[i]['sh_addralign'] = struct.unpack(self.endian + "Q", bin.read(8))[0]
self.sec_hdr[i]['sh_entsize'] = struct.unpack(self.endian + "Q", bin.read(8))[0]
#bin.seek(self.sec_hdr'][self.e_shstrndx']]['sh_offset'], 0)
self.set_section_name()
if self.e_type != 0x2:
print "[!] Only supporting executable elf e_types, things may get wierd."