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libdataflow.py
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libdataflow.py
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import os
from future.utils import viewitems, viewvalues
from utils import guess_machine
from miasm.analysis.binary import Container
from miasm.analysis.machine import Machine
from miasm.expression.expression import get_expr_mem
from miasm.analysis.data_analysis import inter_block_flow #, intra_block_flow_raw
from miasm.core.graph import DiGraph
from miasm.ir.symbexec import SymbolicExecutionEngine
from miasm.analysis.data_flow import DeadRemoval, ReachingDefinitions, DiGraphDefUse
from miasm.core.locationdb import LocationDB
from miasm.core.bin_stream_ida import bin_stream_ida
def intra_block_flow_symb(lifter, _, flow_graph, irblock, in_nodes, out_nodes):
symbols_init = lifter.arch.regs.regs_init.copy()
sb = SymbolicExecutionEngine(lifter, symbols_init)
sb.eval_updt_irblock(irblock)
print('*' * 40)
print(irblock)
out = sb.modified(mems=False)
current_nodes = {}
# Gen mem arg to mem node links
for dst, src in out:
src = sb.eval_expr(dst)
for n in [dst, src]:
all_mems = set()
all_mems.update(get_expr_mem(n))
for n in all_mems:
node_n_w = (irblock.loc_key, 0, n)
if not n == src:
continue
o_r = n.ptr.get_r(mem_read=False, cst_read=True)
for i, n_r in enumerate(o_r):
if n_r in current_nodes:
node_n_r = current_nodes[n_r]
else:
node_n_r = (irblock.loc_key, i, n_r)
if not n_r in in_nodes:
in_nodes[n_r] = node_n_r
flow_graph.add_uniq_edge(node_n_r, node_n_w)
# Gen data flow links
for dst in out:
src = sb.eval_expr(dst)
nodes_r = src.get_r(mem_read=False, cst_read=True)
nodes_w = set([dst])
for n_r in nodes_r:
if n_r in current_nodes:
node_n_r = current_nodes[n_r]
else:
node_n_r = (irblock.loc_key, 0, n_r)
if not n_r in in_nodes:
in_nodes[n_r] = node_n_r
flow_graph.add_node(node_n_r)
for n_w in nodes_w:
node_n_w = (irblock.loc_key, 1, n_w)
out_nodes[n_w] = node_n_w
flow_graph.add_node(node_n_w)
flow_graph.add_uniq_edge(node_n_r, node_n_w)
def intra_block_flow_raw(lifter, ircfg, flow_graph, irb, in_nodes, out_nodes):
"""
Create data flow for an irbloc using raw IR expressions
"""
current_nodes = {}
for i, assignblk in enumerate(irb):
dict_rw = assignblk.get_rw(cst_read=True)
current_nodes.update(out_nodes)
# gen mem arg to mem node links
all_mems = set()
for node_w, nodes_r in viewitems(dict_rw):
for n in nodes_r.union([node_w]):
all_mems.update(get_expr_mem(n))
if not all_mems:
continue
for n in all_mems:
node_n_w = (hex(assignblk.instr.offset), i, n)
if not n in nodes_r:
continue
o_r = n.ptr.get_r(mem_read=False, cst_read=True)
for n_r in o_r:
if n_r in current_nodes:
node_n_r = current_nodes[n_r]
else:
node_n_r = (hex(assignblk.instr.offset), i, n_r)
current_nodes[n_r] = node_n_r
in_nodes[n_r] = node_n_r
flow_graph.add_uniq_edge(node_n_r, node_n_w)
# gen data flow links
for node_w, nodes_r in viewitems(dict_rw):
for n_r in nodes_r:
if n_r in current_nodes:
node_n_r = current_nodes[n_r]
else:
node_n_r = (hex(assignblk.instr.offset), i, n_r)
current_nodes[n_r] = node_n_r
in_nodes[n_r] = node_n_r
flow_graph.add_node(node_n_r)
node_n_w = (hex(assignblk.instr.offset), i + 1, node_w)
out_nodes[node_w] = node_n_w
flow_graph.add_node(node_n_w)
flow_graph.add_uniq_edge(node_n_r, node_n_w)
def node2str(node):
out = "%s,%s\\l\\\n%s" % node
return out
def gen_function_data_flow_graph(lifter, ircfg, ad, block_flow_cb) -> DiGraph:
'''
generate data flow graph for a given function
'''
irblock_0 = None
for irblock in viewvalues(ircfg.blocks):
loc_key = irblock.loc_key
offset = ircfg.loc_db.get_location_offset(loc_key)
# print('{} -> {}'.format(hex(offset), irblock.loc_key))
if offset == ad:
irblock_0 = irblock
break
assert irblock_0 is not None
flow_graph = DiGraph()
flow_graph.node2str = node2str
irb_in_nodes = {}
irb_out_nodes = {}
for label in ircfg.blocks:
irb_in_nodes[label] = {}
irb_out_nodes[label] = {}
for label, irblock in viewitems(ircfg.blocks):
block_flow_cb(lifter, ircfg, flow_graph, irblock, irb_in_nodes[label], irb_out_nodes[label])
# for label in ircfg.blocks:
# print(label)
# print('IN', [str(x) for x in irb_in_nodes[label]])
# print('OUT', [str(x) for x in irb_out_nodes[label]])
# print('*' * 20, 'interblock', '*' * 20)
inter_block_flow(lifter, ircfg, flow_graph, irblock_0.loc_key, irb_in_nodes, irb_out_nodes)
return flow_graph
def ida_dataflow_analysis(function_addr:int, function_name:str, output_dir:str, defuse_only: bool = False) -> None:
loc_db = LocationDB()
###################### IDA specific #######################
machine = guess_machine()
bin_stream = bin_stream_ida()
# Populate symbols with ida names
import idautils
for ad, name in idautils.Names():
if name is None:
continue
loc_db.add_location(name, ad)
###################### Reverse-tool-independent ######################
mdis = machine.dis_engine(bin_stream, loc_db=loc_db, dont_dis_nulstart_bloc=True)
mdis.follow_call = True
lifter = machine.lifter_model_call(loc_db=loc_db)
print('disassembling function: {}:{}'.format(hex(function_addr), function_name))
asmcfg = mdis.dis_multiblock(function_addr)
print('generating IR...')
ircfg = lifter.new_ircfg_from_asmcfg(asmcfg)
deadrm = DeadRemoval(lifter)
# deadrm(ircfg) # TODO: 这里会删掉一部分IR，需要研究一下
with open(os.path.join(output_dir, '{}.asm2ir'.format(function_name)),'w') as f:
# print('\tOFFSET\t| ASM\t| SRC -> DST')
f.write('\tOFFSET\t| ASM\t| SRC -> DST\n')
for lbl, irblock in ircfg.blocks.items():
insr = []
for assignblk in irblock:
for dst, src in assignblk.iteritems():
# print('\t{}\t| {}\t| {} -> {}'.format(hex(assignblk.instr.offset), assignblk.instr, src, dst))
f.write('\t{}\t| {}\t| {} -> {}\n'.format(hex(assignblk.instr.offset), assignblk.instr, src, dst))
if not defuse_only:
block_flow_cb = intra_block_flow_raw # if args.symb else intra_block_flow_symb
dfg = gen_function_data_flow_graph(lifter, ircfg, function_addr, block_flow_cb)
open(os.path.join(output_dir,'{}_dfg.dot'.format(function_name)), 'w').write(dfg.dot())
reaching_defs = ReachingDefinitions(ircfg)
defuse = DiGraphDefUse(reaching_defs)
open(os.path.join(output_dir,'{}_defuse.dot'.format(function_name)), 'w').write(defuse.dot())
'''
根据block_loc_key + assignblk_idx 可以推算出instr offset，所以这个def-use图也是可以对应回指令的
'''
LocKeyIdx2InstrOffset = {}
for block in viewvalues(reaching_defs.ircfg.blocks):
for index, assignblk in enumerate(block):
LocKeyIdx2InstrOffset['{}_{}'.format(block.loc_key, index)] = hex(assignblk.instr.offset)
# print(['{}:{}'.format(key,LocKeyIdx2InstrOffset[key]) for key in LocKeyIdx2InstrOffset])
open(os.path.join(output_dir,'{}_LocKeyIdx2InstrOffset.map'.format(function_name)), 'w').write(
'\n'.join(['{}:{}'.format(key,LocKeyIdx2InstrOffset[key]) for key in LocKeyIdx2InstrOffset]))
def miasm_dataflow_analysis(function_addr:int, function_name:str, output_dir:str, filepath:str, arch:str = "X86_64", defuse_only: bool = False) -> None:
bin_stream = Container.from_stream(open(filepath, 'rb'), loc_db).bin_stream
machine = Machine(arch)
loc_db = LocationDB()
mdis = machine.dis_engine(bin_stream, loc_db=loc_db, dont_dis_nulstart_bloc=True)
mdis.follow_call = True
lifter = machine.lifter_model_call(loc_db=loc_db)
print('disassembling function: {}:{}'.format(hex(function_addr), function_name))
asmcfg = mdis.dis_multiblock(function_addr)
print('generating IR...')
ircfg = lifter.new_ircfg_from_asmcfg(asmcfg)
deadrm = DeadRemoval(lifter)
# deadrm(ircfg) # TODO: 这里会删掉一部分IR，需要研究一下
with open(os.path.join(output_dir, '{}.asm2ir'.format(function_name)),'w') as f:
# print('\tOFFSET\t| ASM\t| SRC -> DST')
f.write('\tOFFSET\t| ASM\t| SRC -> DST\n')
for lbl, irblock in ircfg.blocks.items():
insr = []
for assignblk in irblock:
for dst, src in assignblk.iteritems():
# print('\t{}\t| {}\t| {} -> {}'.format(hex(assignblk.instr.offset), assignblk.instr, src, dst))
f.write('\t{}\t| {}\t| {} -> {}\n'.format(hex(assignblk.instr.offset), assignblk.instr, src, dst))
if not defuse_only:
block_flow_cb = intra_block_flow_raw # if args.symb else intra_block_flow_symb
dfg = gen_function_data_flow_graph(lifter, ircfg, function_addr, block_flow_cb)
open(os.path.join(output_dir,'{}_dfg.dot'.format(function_name)), 'w').write(dfg.dot())
reaching_defs = ReachingDefinitions(ircfg)
defuse = DiGraphDefUse(reaching_defs)
open(os.path.join(output_dir,'{}_defuse.dot'.format(function_name)), 'w').write(defuse.dot())
'''
根据block_loc_key + assignblk_idx 可以推算出instr offset，所以这个def-use图也是可以对应回指令的
'''
LocKeyIdx2InstrOffset = {}
for block in viewvalues(reaching_defs.ircfg.blocks):
for index, assignblk in enumerate(block):
LocKeyIdx2InstrOffset['{}_{}'.format(block.loc_key, index)] = hex(assignblk.instr.offset)
# print(['{}:{}'.format(key,LocKeyIdx2InstrOffset[key]) for key in LocKeyIdx2InstrOffset])
open(os.path.join(output_dir,'{}_LocKeyIdx2InstrOffset.map'.format(function_name)), 'w').write(
'\n'.join(['{}:{}'.format(key,LocKeyIdx2InstrOffset[key]) for key in LocKeyIdx2InstrOffset]))