Angr
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이 치트시트의 일부는 angr documentation을 기반으로 합니다.
설치
sudo apt-get install python3-dev libffi-dev build-essential
python3 -m pip install --user virtualenv
python3 -m venv ang
source ang/bin/activate
pip install angr기본 작업
import angr
import monkeyhex # this will format numerical results in hexadecimal
#Load binary
proj = angr.Project('/bin/true')
#BASIC BINARY DATA
proj.arch #Get arch "<Arch AMD64 (LE)>"
proj.arch.name #'AMD64'
proj.arch.memory_endness #'Iend_LE'
proj.entry #Get entrypoint "0x4023c0"
proj.filename #Get filename "/bin/true"
#There are specific options to load binaries
#Usually you won't need to use them but you could
angr.Project('examples/fauxware/fauxware', main_opts={'backend': 'blob', 'arch': 'i386'}, lib_opts={'libc.so.6': {'backend': 'elf'}})로드된 및 주요 객체 정보
로드된 데이터
#LOADED DATA
proj.loader #<Loaded true, maps [0x400000:0x5004000]>
proj.loader.min_addr #0x400000
proj.loader.max_addr #0x5004000
proj.loader.all_objects #All loaded
proj.loader.shared_objects #Loaded binaries
"""
OrderedDict([('true', <ELF Object true, maps [0x400000:0x40a377]>),
('libc.so.6',
<ELF Object libc-2.31.so, maps [0x500000:0x6c4507]>),
('ld-linux-x86-64.so.2',
<ELF Object ld-2.31.so, maps [0x700000:0x72c177]>),
('extern-address space',
<ExternObject Object cle##externs, maps [0x800000:0x87ffff]>),
('cle##tls',
<ELFTLSObjectV2 Object cle##tls, maps [0x900000:0x91500f]>)])
"""
proj.loader.all_elf_objects #Get all ELF objects loaded (Linux)
proj.loader.all_pe_objects #Get all binaries loaded (Windows)
proj.loader.find_object_containing(0x400000)#Get object loaded in an address "<ELF Object fauxware, maps [0x400000:0x60105f]>"주요 객체
#Main Object (main binary loaded)
obj = proj.loader.main_object #<ELF Object true, maps [0x400000:0x60721f]>
obj.execstack #"False" Check for executable stack
obj.pic #"True" Check PIC
obj.imports #Get imports
obj.segments #<Regions: [<ELFSegment flags=0x5, relro=0x0, vaddr=0x400000, memsize=0xa74, filesize=0xa74, offset=0x0>, <ELFSegment flags=0x4, relro=0x1, vaddr=0x600e28, memsize=0x1d8, filesize=0x1d8, offset=0xe28>, <ELFSegment flags=0x6, relro=0x0, vaddr=0x601000, memsize=0x60, filesize=0x50, offset=0x1000>]>
obj.find_segment_containing(obj.entry) #Get segment by address
obj.sections #<Regions: [<Unnamed | offset 0x0, vaddr 0x0, size 0x0>, <.interp | offset 0x238, vaddr 0x400238, size 0x1c>, <.note.ABI-tag | offset 0x254, vaddr 0x400254, size 0x20>, <.note.gnu.build-id ...
obj.find_section_containing(obj.entry) #Get section by address
obj.plt['strcmp'] #Get plt address of a funcion (0x400550)
obj.reverse_plt[0x400550] #Get function from plt address ('strcmp')기호 및 재배치
strcmp = proj.loader.find_symbol('strcmp') #<Symbol "strcmp" in libc.so.6 at 0x1089cd0>
strcmp.name #'strcmp'
strcmp.owne #<ELF Object libc-2.23.so, maps [0x1000000:0x13c999f]>
strcmp.rebased_addr #0x1089cd0
strcmp.linked_addr #0x89cd0
strcmp.relative_addr #0x89cd0
strcmp.is_export #True, as 'strcmp' is a function exported by libc
#Get strcmp from the main object
main_strcmp = proj.loader.main_object.get_symbol('strcmp')
main_strcmp.is_export #False
main_strcmp.is_import #True
main_strcmp.resolvedby #<Symbol "strcmp" in libc.so.6 at 0x1089cd0>블록
#Blocks
block = proj.factory.block(proj.entry) #Get the block of the entrypoint fo the binary
block.pp() #Print disassembly of the block
block.instructions #"0xb" Get number of instructions
block.instruction_addrs #Get instructions addresses "[0x401670, 0x401672, 0x401675, 0x401676, 0x401679, 0x40167d, 0x40167e, 0x40167f, 0x401686, 0x40168d, 0x401694]"동적 분석
시뮬레이션 관리자, 상태
#Live States
#This is useful to modify content in a live analysis
state = proj.factory.entry_state()
state.regs.rip #Get the RIP
state.mem[proj.entry].int.resolved #Resolve as a C int (BV)
state.mem[proj.entry].int.concreteved #Resolve as python int
state.regs.rsi = state.solver.BVV(3, 64) #Modify RIP
state.mem[0x1000].long = 4 #Modify mem
#Other States
project.factory.entry_state()
project.factory.blank_state() #Most of its data left uninitialized
project.factory.full_init_statetate() #Execute through any initializers that need to be run before the main binary's entry point
project.factory.call_state() #Ready to execute a given function.
#Simulation manager
#The simulation manager stores all the states across the execution of the binary
simgr = proj.factory.simulation_manager(state) #Start
simgr.step() #Execute one step
simgr.active[0].regs.rip #Get RIP from the last state함수 호출
entry_state와full_init_state에args를 통해 인수 목록을 전달하고,env를 통해 환경 변수 사전을 전달할 수 있습니다. 이러한 구조의 값은 문자열 또는 비트벡터일 수 있으며, 시뮬레이션된 실행의 인수 및 환경으로 상태에 직렬화됩니다. 기본args는 빈 목록이므로, 분석 중인 프로그램이 최소한argv[0]을 찾기를 기대하는 경우 항상 제공해야 합니다!argc를 심볼릭으로 설정하려면,entry_state와full_init_state생성자에 심볼릭 비트벡터를argc로 전달할 수 있습니다. 그러나 주의해야 합니다: 이렇게 할 경우,argc에 대한 값이args에 전달한 인수의 수보다 클 수 없다는 제약 조건을 결과 상태에 추가해야 합니다.호출 상태를 사용하려면
.call_state(addr, arg1, arg2, ...)로 호출해야 하며, 여기서addr은 호출하려는 함수의 주소이고argN은 해당 함수에 대한 N번째 인수로, 파이썬 정수, 문자열, 배열 또는 비트벡터로 전달할 수 있습니다. 메모리를 할당하고 실제로 객체에 대한 포인터를 전달하려면, 이를 PointerWrapper로 감싸야 합니다. 즉,angr.PointerWrapper("point to me!")와 같이 사용합니다. 이 API의 결과는 다소 예측할 수 없지만, 우리는 이를 개선하고 있습니다.
비트벡터
#BitVectors
state = proj.factory.entry_state()
bv = state.solver.BVV(0x1234, 32) #Create BV of 32bits with the value "0x1234"
state.solver.eval(bv) #Convert BV to python int
bv.zero_extend(30) #Will add 30 zeros on the left of the bitvector
bv.sign_extend(30) #Will add 30 zeros or ones on the left of the BV extending the sign심볼릭 비트벡터 및 제약조건
x = state.solver.BVS("x", 64) #Symbolic variable BV of length 64
y = state.solver.BVS("y", 64)
#Symbolic oprations
tree = (x + 1) / (y + 2)
tree #<BV64 (x_9_64 + 0x1) / (y_10_64 + 0x2)>
tree.op #'__floordiv__' Access last operation
tree.args #(<BV64 x_9_64 + 0x1>, <BV64 y_10_64 + 0x2>)
tree.args[0].op #'__add__' Access of dirst arg
tree.args[0].args #(<BV64 x_9_64>, <BV64 0x1>)
tree.args[0].args[1].op #'BVV'
tree.args[0].args[1].args #(1, 64)
#Symbolic constraints solver
state = proj.factory.entry_state() #Get a fresh state without constraints
input = state.solver.BVS('input', 64)
operation = (((input + 4) * 3) >> 1) + input
output = 200
state.solver.add(operation == output)
state.solver.eval(input) #0x3333333333333381
state.solver.add(input < 2**32)
state.satisfiable() #False
#Solver solutions
solver.eval(expression) #one possible solution
solver.eval_one(expression) #solution to the given expression, or throw an error if more than one solution is possible.
solver.eval_upto(expression, n) #n solutions to the given expression, returning fewer than n if fewer than n are possible.
solver.eval_atleast(expression, n) #n solutions to the given expression, throwing an error if fewer than n are possible.
solver.eval_exact(expression, n) #n solutions to the given expression, throwing an error if fewer or more than are possible.
solver.min(expression) #minimum possible solution to the given expression.
solver.max(expression) #maximum possible solution to the given expression.후킹
>>> stub_func = angr.SIM_PROCEDURES['stubs']['ReturnUnconstrained'] # this is a CLASS
>>> proj.hook(0x10000, stub_func()) # hook with an instance of the class
>>> proj.is_hooked(0x10000) # these functions should be pretty self-explanitory
True
>>> proj.hooked_by(0x10000)
<ReturnUnconstrained>
>>> proj.unhook(0x10000)
>>> @proj.hook(0x20000, length=5)
... def my_hook(state):
... state.regs.rax = 1
>>> proj.is_hooked(0x20000)
True또한, proj.hook_symbol(name, hook)을 사용하여 기호의 이름을 첫 번째 인수로 제공하면 기호가 위치한 주소를 후킹할 수 있습니다.
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