#!/bin/python3 import argparse import sys class CLIArgParser(object): def __init__(self): parser = argparse.ArgumentParser() parser.add_argument("--obj", type=str, help="path to the executbale, shared object or object you want to load in bruiser") self.args = parser.parse_args() if self.args.obj is None: raise Exception("no object file provided. please specify an object with --obj.") class sh_type_e: SHT_NULL = 0x0 SHT_PROGBITS = 0x1 SHT_SYMTAB = 0x2 SHT_STRTAB = 0x3 SHT_RELA = 0x4 SHT_HASH = 0x5 SHT_DYNAMIC = 0x6 SHT_NOTE = 0x7 SHT_NOBITS = 0x8 SHT_REL = 0x9 SHT_SHLIB = 0xa SHT_DYNSYM = 0xb SHT_INIT_ARRAY = 0xe SHT_FINI_ARRAY = 0xf SHT_PREINIT = 0x10 SHT_GROUP = 0x11 SHT_SYMTAB_SHNDX = 0x12 SHT_NUM = 0x13 SHT_LOOS = 0x60000000 class sh_flags_e: SHF_WRITE = 0x1 SHF_ALLOC = 0x2 SHF_EXECINSTR = 0x4 SHF_MERGE = 0x10 SHF_STRINGS = 0x20 SHF_INFO_LINK = 0x40 SHF_LINK_ORDER = 0x80 SHF_OS_NONCONFORMING = 0x100 SHF_GROUP = 0x200 SHF_TLS = 0x400 SHF_MASKOS = 0x0ff00000 SHF_MASKPROC = 0xf0000000 SHF_ORDERED = 0x4000000 SHF_EXCLUDE = 0x8000000 class p_type_e: PT_NULL = 0x0 PT_LOAD = 0x1 PT_DYNAMIC = 0x2 PT_INTERP = 0x3 PT_NOTE = 0x4 PT_SHLIB = 0x5 PT_PHDR = 0x6 PT_LOOS = 0x60000000 PT_HIOS = 0x6FFFFFFF PT_LOPROC = 0x70000000 PT_HIPROC = 0x7FFFFFFF class Colors: purple = '\033[95m' blue = '\033[94m' green = '\033[92m' yellow = '\033[93m' red = '\033[91m' grey = '\033[1;37m' darkgrey = '\033[1;30m' cyan = '\033[1;36m' ENDC = '\033[0m' BOLD = '\033[1m' UNDERLINE = '\033[4m' def openSO_r(path): so = open(path, "rb") return so def openSO_w(path): so = open(path, "wb") return so class ELFHDR(): def __init__(self, ei_mag, ei_class, ei_data, ei_version, ei_osabi, ei_abiversion, ei_pad, e_type, e_machine, e_version, e_entry, e_phoff, e_shoff, e_flags, e_ehsize, e_phentsize, e_phnum, e_shentsize, e_shnum, e_shstrndx): self.ei_mag = ei_mag self.ei_class = ei_class self.ei_data = ei_data self.ei_version = ei_version self.ei_osabi = ei_osabi self.ei_abiversion = ei_abiversion self.ei_pad = ei_pad self.e_type = e_type self.e_machine = e_machine self.e_version = e_version self.e_entry = e_entry self.e_phoff = e_phoff self.e_shoff = e_shoff self.e_flags = e_flags self.e_ehsize = e_ehsize self.e_phentsize = e_phentsize self.e_phnum = e_phnum self.e_shentsize = e_shentsize self.e_shnum = e_shnum self.e_shstrndx = e_shstrndx class PHDR(): def __init__(self, p_type, p_flags, p_offset, p_vaddr, p_paddr, p_filesz, p_memsz, p_flags2, p_align): self.p_type = p_type self.p_flags = p_flags self.p_offset = p_offset self.p_vaddr = p_vaddr self.p_paddr = p_paddr self.p_filesz = p_filesz self.p_memsz = p_memsz self.p_flags2 = p_flags2 self.p_align = p_align class SHDR(): def __init__(self, sh_name, sh_type, sh_flags, sh_addr, sh_offset, sh_size, sh_link, sh_info, sh_addralign, sh_entsize): self.sh_name = sh_name self.sh_type = sh_type self.sh_flags = sh_flags self.sh_addr = sh_addr self.sh_offset = sh_offset self.sh_size = sh_size self.sh_link = sh_link self.sh_info = sh_info self.sh_addralign = sh_addralign self.sh_entsize = sh_entsize class Symbol_Table_Entry64(): def __init__(self, st_name, st_info, st_other, st_shndx, st_value, st_size): self.st_name = st_name self.st_info = st_info self.st_other = st_other self.st_shndx = st_shndx self.st_value = st_value self.st_size = st_size class ELF(object): def __init__(self, so): self.so = so self.so.seek(0, 0) self.elfhdr = ELFHDR(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0) self.phdr = [] self.shhdr = [] self.size = int() self.string_tb_e = [] self.string_tb_e_dyn = [] self.symbols = [] def init(self, size): self.size = size self.read_ELF_H(size) self.so.seek(int.from_bytes(self.elfhdr.e_phoff, byteorder="little", signed=False)) phnum = int.from_bytes(self.elfhdr.e_phnum, byteorder="little", signed=False) for i in range(0, phnum): self.read_PHDR(size) self.so.seek(int.from_bytes(self.elfhdr.e_shoff, byteorder="little", signed=False)) shnum = int.from_bytes(self.elfhdr.e_shnum, byteorder="little", signed=False) for i in range(0, shnum): self.read_SHDR(size) #self.read_SHDR(size) for i in range(0, shnum): type = int.from_bytes(self.shhdr[i].sh_type, byteorder="little", signed=False) if type == sh_type_e.SHT_SYMTAB: print(Colors.green, end="") print("size: " + repr(int.from_bytes(self.shhdr[i].sh_size, byteorder="little"))) print("offset: " + repr(int.from_bytes(self.shhdr[i].sh_offset, byteorder="little"))) self.so.seek(int.from_bytes(self.shhdr[i].sh_offset, byteorder="little", signed=False), 0) symbol_tb = self.so.read(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False)) #print(symbol_tb) offset = 0 num = int(int.from_bytes(self.shhdr[i].sh_size, byteorder="little") / 24) print(num) for j in range(0, num): self.read_st_entry(symbol_tb[offset:offset + 24], self.string_tb_e) offset += 8*24 print(Colors.ENDC) if type == sh_type_e.SHT_DYNSYM: print(Colors.green, end="") print("size: " + repr(int.from_bytes(self.shhdr[i].sh_size, byteorder="little"))) print("offset: " + repr(int.from_bytes(self.shhdr[i].sh_offset, byteorder="little"))) self.so.seek(int.from_bytes(self.shhdr[i].sh_offset, byteorder="little", signed=False), 0) symbol_tb = self.so.read(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False)) #print(symbol_tb) offset = 0 num = int(int.from_bytes(self.shhdr[i].sh_size, byteorder="little") / 24) print(num) for j in range(0, num): self.read_st_entry(symbol_tb[offset:offset + 24], self.string_tb_e_dyn) offset += 8*24 print(Colors.ENDC) # 32 or 64 def read_ELF_H(self, size): self.elfhdr.ei_mag = self.so.read(4) self.elfhdr.ei_class = self.so.read(1) self.elfhdr.ei_data = self.so.read(1) self.elfhdr.ei_version = self.so.read(1) self.elfhdr.ei_osabi = self.so.read(1) self.elfhdr.ei_abiversion = self.so.read(1) self.elfhdr.ei_pad = self.so.read(7) self.elfhdr.e_type = self.so.read(2) self.elfhdr.e_machine = self.so.read(2) self.elfhdr.e_version = self.so.read(4) if size == 32: self.elfhdr.e_entry = self.so.read(4) elif size == 64: self.elfhdr.e_entry = self.so.read(8) if size == 32: self.elfhdr.e_phoff = self.so.read(4) elif size == 64: self.elfhdr.e_phoff = self.so.read(8) if size == 32: self.elfhdr.e_shoff = self.so.read(4) elif size == 64: self.elfhdr.e_shoff = self.so.read(8) self.elfhdr.e_flags = self.so.read(4) self.elfhdr.e_ehsize = self.so.read(2) self.elfhdr.e_phentsize = self.so.read(2) self.elfhdr.e_phnum = self.so.read(2) self.elfhdr.e_shentsize = self.so.read(2) self.elfhdr.e_shnum = self.so.read(2) self.elfhdr.e_shstrndx = self.so.read(2) def read_PHDR(self, size): dummy = PHDR(0,0,0,0,0,0,0,0,0) dummy.p_type = self.so.read(4) if size == 64: dummy.p_flags = self.so.read(4) if size == 32: dummy.p_offset = self.so.read(4) elif size == 64: dummy.p_offset = self.so.read(8) if size == 32: dummy.p_vaddr = self.so.read(4) elif size == 64: dummy.p_vaddr = self.so.read(8) if size == 32: dummy.p_paddr = self.so.read(4) elif size == 64: dummy.p_paddr = self.so.read(8) if size == 32: dummy.p_filesz = self.so.read(4) elif size == 64: dummy.p_filesz = self.so.read(8) if size == 32: dummy.p_memsz = self.so.read(4) elif size == 64: dummy.p_memsz = self.so.read(8) if size == 32: dummy.p_flags2 = self.so.read(4) elif size == 64: pass if size == 32: dummy.p_align = self.so.read(4) elif size == 64: dummy.p_align = self.so.read(8) self.phdr.append(dummy) def read_SHDR(self, size): dummy = SHDR(0,0,0,0,0,0,0,0,0,0) dummy.sh_name = self.so.read(4) dummy.sh_type = self.so.read(4) if size == 32: dummy.sh_flags = self.so.read(4) elif size == 64: dummy.sh_flags = self.so.read(8) if size == 32: dummy.sh_addr = self.so.read(4) elif size == 64: dummy.sh_addr = self.so.read(8) if size == 32: dummy.sh_offset = self.so.read(4) elif size == 64: dummy.sh_offset = self.so.read(8) if size == 32: dummy.sh_size = self.so.read(4) elif size == 64: dummy.sh_size = self.so.read(8) dummy.sh_link = self.so.read(4) dummy.sh_info = self.so.read(4) if size == 32: dummy.sh_addralign = self.so.read(4) elif size == 64: dummy.sh_addralign = self.so.read(8) if size == 32: dummy.sh_entsize = self.so.read(4) elif size == 64: dummy.sh_entsize = self.so.read(8) self.shhdr.append(dummy) def read_st_entry(self, st, entry_list): dummy = Symbol_Table_Entry64(0,0,0,0,0,0) dummy.st_name = st[0:4] dummy.st_info = st[4:5] dummy.st_other = st[5:6] dummy.st_shndx = st[6:8] dummy.st_value = st[8:16] dummy.st_size = st[16:24] entry_list.append(dummy) def dump_objs(self): for iter in self.string_tb_e: self.so.seek(int.from_bytes(iter.st_value, byteorder="little")) obj = self.so.read(int.from_bytes(iter.st_size, byteorder="little")) for byte in obj: print(chr(byte)) def dump_symbol_idx(self): print(Colors.green + "symbol:" + Colors.ENDC) for iter in self.string_tb_e: if not int.from_bytes(iter.st_size, byteorder="little") == 0: print("-----------------------------------------------------------------") print(Colors.blue + "name: " + Colors.cyan + repr(int.from_bytes(iter.st_name, byteorder="little")) + Colors.ENDC) print(Colors.blue + "size: " + Colors.cyan + repr(int.from_bytes(iter.st_size, byteorder="little")) + Colors.ENDC) print(Colors.blue + "value: " + Colors.cyan + repr(int.from_bytes(iter.st_value, byteorder="little")) + Colors.ENDC) print(Colors.blue + "info: " + Colors.cyan + repr(int.from_bytes(iter.st_info, byteorder="little")) + Colors.ENDC) print(Colors.blue + "other: " + Colors.cyan + repr(int.from_bytes(iter.st_other, byteorder="little")) + Colors.ENDC) print(Colors.blue + "shndx: " + Colors.cyan + repr(int.from_bytes(iter.st_shndx, byteorder="little")) + Colors.ENDC) print("-----------------------------------------------------------------") print(Colors.green + "dyn symbol:" + Colors.ENDC) for iter in self.string_tb_e_dyn: if not int.from_bytes(iter.st_size, byteorder="little") == 0: print("-----------------------------------------------------------------") print(Colors.blue + "name: " + Colors.cyan + repr(int.from_bytes(iter.st_name, byteorder="little")) + Colors.ENDC) print(Colors.blue + "size: " + Colors.cyan + repr(int.from_bytes(iter.st_size, byteorder="little")) + Colors.ENDC) print(Colors.blue + "value: " + Colors.cyan + repr(int.from_bytes(iter.st_value, byteorder="little")) + Colors.ENDC) print(Colors.blue + "info: " + Colors.cyan + repr(int.from_bytes(iter.st_info, byteorder="little")) + Colors.ENDC) print(Colors.blue + "other: " + Colors.cyan + repr(int.from_bytes(iter.st_other, byteorder="little")) + Colors.ENDC) print(Colors.blue + "shndx: " + Colors.cyan + repr(int.from_bytes(iter.st_shndx, byteorder="little")) + Colors.ENDC) print("-----------------------------------------------------------------") def dump_header(self): print("------------------------------------------------------------------------------") print(Colors.green + "elf header:" + Colors.ENDC) print(Colors.blue + "ei_mag: " + Colors.cyan + repr(self.elfhdr.ei_mag) + Colors.ENDC) print(Colors.blue + "ei_class: " + Colors.cyan + repr(self.elfhdr.ei_class) + Colors.ENDC) print(Colors.blue + "ei_data: " + Colors.cyan + repr(self.elfhdr.ei_data) + Colors.ENDC) print(Colors.blue + "ei_version: " + Colors.cyan + repr(self.elfhdr.ei_version) + Colors.ENDC) print(Colors.blue + "ei_osabi: " + Colors.cyan + repr(self.elfhdr.ei_osabi) + Colors.ENDC) print(Colors.blue + "ei_abiversion: " + Colors.cyan + repr(self.elfhdr.ei_abiversion) + Colors.ENDC) print(Colors.blue + "ei_pad: " + Colors.cyan + repr(self.elfhdr.ei_pad) + Colors.ENDC) print(Colors.blue + "e_type: " + Colors.cyan + repr(self.elfhdr.e_type) + Colors.ENDC) print(Colors.blue + "e_machine: " + Colors.cyan + repr(self.elfhdr.e_machine) + Colors.ENDC) print(Colors.blue + "e_version: " + Colors.cyan + repr(self.elfhdr.e_version) + Colors.ENDC) print(Colors.blue + "e_entry: " + Colors.cyan + repr(self.elfhdr.e_entry) + Colors.ENDC) print(Colors.blue + "e_phoff: " + Colors.cyan + repr(self.elfhdr.e_phoff) + Colors.ENDC) print(Colors.blue + "e_shoff: " + Colors.cyan + repr(self.elfhdr.e_shoff) + Colors.ENDC) print(Colors.blue + "e_flags: " + Colors.cyan + repr(self.elfhdr.e_flags) + Colors.ENDC) print(Colors.blue + "e_ehsize: " + Colors.cyan + repr(self.elfhdr.e_ehsize) + Colors.ENDC) print(Colors.blue + "e_phentsize: " + Colors.cyan + repr(self.elfhdr.e_phentsize) + Colors.ENDC) print(Colors.blue + "e_phnum: " + Colors.cyan + repr(self.elfhdr.e_phnum) + Colors.ENDC) print(Colors.blue + "e_shentsize: " + Colors.cyan + repr(self.elfhdr.e_shentsize) + Colors.ENDC) print(Colors.blue + "e_shnum: " + Colors.cyan + repr(self.elfhdr.e_shnum) + Colors.ENDC) print(Colors.blue + "e_shstrndx: " + Colors.cyan + repr(self.elfhdr.e_shstrndx) + Colors.ENDC) print("------------------------------------------------------------------------------") def dump_phdrs(self): print(Colors.green + "pheaders:" + Colors.ENDC) for i in range(0, int.from_bytes(self.elfhdr.e_phnum, byteorder="little", signed=False)): print("------------------------------------------------------------------------------") print(Colors.blue + "p_type: " + Colors.cyan + repr(self.phdr[i].p_type) + Colors.ENDC) print(Colors.blue + "p_flags: " + Colors.cyan + repr(self.phdr[i].p_flags) + Colors.ENDC) print(Colors.blue + "p_offset: " + Colors.cyan + repr(self.phdr[i].p_offset) + Colors.ENDC) print(Colors.blue + "p_vaddr: " + Colors.cyan + repr(self.phdr[i].p_vaddr) + Colors.ENDC) print(Colors.blue + "p_paddr: " + Colors.cyan + repr(self.phdr[i].p_paddr) + Colors.ENDC) print(Colors.blue + "p_filesz: " + Colors.cyan + repr(self.phdr[i].p_filesz) + Colors.ENDC) print(Colors.blue + "p_memsz: " + Colors.cyan + repr(self.phdr[i].p_memsz) + Colors.ENDC) print(Colors.blue + "p_flags2: " + Colors.cyan + repr(self.phdr[i].p_flags2) + Colors.ENDC) print(Colors.blue + "p_align: " + Colors.cyan + repr(self.phdr[i].p_align) + Colors.ENDC) print("------------------------------------------------------------------------------") def dump_shdrs(self): print(Colors.green + "sheaders:" + Colors.ENDC) for i in range(0, int.from_bytes(self.elfhdr.e_shnum, byteorder="little", signed=False)): print("------------------------------------------------------------------------------") print(Colors.blue + "sh_name: " + Colors.cyan + repr(self.shhdr[i].sh_name) + Colors.ENDC) print(Colors.blue + "sh_type: " + Colors.cyan + repr(self.shhdr[i].sh_type) + Colors.ENDC) print(Colors.blue + "sh_flags: " + Colors.cyan + repr(self.shhdr[i].sh_flags) + Colors.ENDC) print(Colors.blue + "sh_addr: " + Colors.cyan + repr(self.shhdr[i].sh_addr) + Colors.ENDC) print(Colors.blue + "sh_offset: " + Colors.cyan + repr(self.shhdr[i].sh_offset) + Colors.ENDC) print(Colors.blue + "sh_size: " + Colors.cyan + repr(self.shhdr[i].sh_size) + Colors.ENDC) print(Colors.blue + "sh_link: " + Colors.cyan + repr(self.shhdr[i].sh_link) + Colors.ENDC) print(Colors.blue + "sh_info: " + Colors.cyan + repr(self.shhdr[i].sh_info) + Colors.ENDC) print(Colors.blue + "sh_addralign: " + Colors.cyan + repr(self.shhdr[i].sh_addralign) + Colors.ENDC) print(Colors.blue + "sh_entsize: " + Colors.cyan + repr(self.shhdr[i].sh_entsize) + Colors.ENDC) print("------------------------------------------------------------------------------") def dump_symbol_tb(self): for i in range(0, int.from_bytes(self.elfhdr.e_shnum, byteorder="little", signed=False)): #print(repr(int.from_bytes(self.shhdr[i].sh_type, byteorder="little", signed=False)) + " : ", end='') #print(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False)) if int.from_bytes(self.shhdr[i].sh_type, byteorder="little", signed=False) == sh_type_e.SHT_SYMTAB: self.so.seek(int.from_bytes(self.shhdr[i].sh_offset, byteorder="little", signed=False), 0) #print(self.so.read(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False))) symbol_tb = self.so.read(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False)) if int.from_bytes(self.shhdr[i].sh_type, byteorder="little", signed=False) == sh_type_e.SHT_DYNSYM: self.so.seek(int.from_bytes(self.shhdr[i].sh_offset, byteorder="little", signed=False), 0) #print(self.so.read(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False))) symbol_tb = self.so.read(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False)) if int.from_bytes(self.shhdr[i].sh_type, byteorder="little", signed=False) == sh_type_e.SHT_STRTAB: self.so.seek(int.from_bytes(self.shhdr[i].sh_offset, byteorder="little", signed=False), 0) #print(self.so.read(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False))) symbol_tb = self.so.read(int.from_bytes(self.shhdr[i].sh_size, byteorder="little", signed=False)) #print(symbol_tb.decode("utf-8")) for byte in symbol_tb: print(chr(byte), end='') if chr(byte) == '\0': print() class obj_loader(): def __init__(self, bytes): self.memory = bytes() def load(self, obj): for byte in obj: self.memory.append(byte) def ch_so_to_exe(path): so = open(path, "r+b") so.seek(16) so.write(bytes([2])) print(Colors.purple + "changed so to exe" + Colors.ENDC) so.close def ch_exe_to_so(path): so = open(path, "r+b") so.seek(16) so.write(bytes([3])) print(Colors.purple + "changed exe to so" + Colors.ENDC) def main(): #argparser = CLIArgParser() #if argparser.args.obj is None: so = openSO_r("./test/test.so") #else: so = openSO_r(argparser.args.obj) so = openSO_r(sys.argv[1]) elf = ELF(so) elf.init(64) #elf.dump_header() #elf.dump_symbol_tb() #elf.dump_phdrs() elf.dump_shdrs() #elf.dump_symbol_idx() #elf.dump_objs() ''' so.close() ch_so_to_exe("./test/test.so") so = openSO_r("./test/test.so") elf2 = ELF(so) elf2.init(64) elf.dump_header() ''' return 0; if __name__ == "__main__": main()