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from __future__ import print_function
import operator
from future.utils import viewitems
import idaapi
import idc
from miasm.expression.expression_helper import Variables_Identifier
from miasm.expression.expression import ExprAssign
from miasm.core.locationdb import LocationDB
from utils import expr2colorstr, translatorForm
class ActionHandler(idaapi.action_handler_t):
def activate(self, ctx):
view_index = get_focused_view()
if view_index is None:
return 1
self.custom_action(all_views[view_index])
return 1
def update(self, ctx):
return idaapi.AST_ENABLE_ALWAYS
class ActionHandlerExpand(ActionHandler):
def custom_action(self, view):
view.expand_expr()
class ActionHandlerTranslate(ActionHandler):
def custom_action(self, view):
view.translate_expr(view.GetLineNo())
class symbolicexec_t(idaapi.simplecustviewer_t):
def add(self, key, value):
self.AddLine("%s = %s" % (
expr2colorstr(
key,
loc_db=self.loc_db
),
expr2colorstr(
value,
loc_db=self.loc_db
)
))
def expand(self, linenum):
element = self.line2eq[linenum]
expanded = Variables_Identifier(element[1],
var_prefix="%s_v" % element[0])
self.line2eq = (
self.line2eq[0:linenum] +
list(viewitems(expanded.vars)) +
[(element[0], expanded.equation)] +
self.line2eq[linenum + 1:]
)
def print_lines(self):
self.ClearLines()
for element in self.line2eq:
self.add(*element)
self.Refresh()
def translate_expr(self, line_nb):
element = self.line2eq[line_nb]
expr = ExprAssign(*element)
form = translatorForm(expr)
form.Compile()
form.Execute()
def Create(self, equations, machine, loc_db, *args, **kwargs):
if not super(symbolicexec_t, self).Create(*args, **kwargs):
return False
self.machine = machine
self.loc_db = loc_db
self.line2eq = sorted(viewitems(equations), key=operator.itemgetter(0))
self.lines_expanded = set()
self.print_lines()
return True
def expand_expr(self):
self.expand(self.GetLineNo())
self.print_lines()
def OnPopupMenu(self, menu_id):
if menu_id == self.menu_expand:
self.expand(self.GetLineNo())
self.print_lines()
if menu_id == self.menu_translate:
self.translate_expr(self.GetLineNo())
return True
def OnKeydown(self, vkey, shift):
# ESCAPE
if vkey == 27:
self.Close()
return True
if vkey == ord('E'):
self.expand_expr()
if vkey == ord('T'):
self.translate_expr(self.GetLineNo())
return False
def get_focused_view():
for i, view in enumerate(all_views):
if view.IsFocused():
return i
return None
class Hooks(idaapi.UI_Hooks):
def finish_populating_widget_popup(self, form, popup):
idaapi.attach_action_to_popup(form, popup, 'my:expand', None)
idaapi.attach_action_to_popup(form, popup, 'my:translate', None)
def symbolic_exec():
from miasm.ir.symbexec import SymbolicExecutionEngine
from miasm.core.bin_stream_ida import bin_stream_ida
from utils import guess_machine
start, end = idc.read_selection_start(), idc.read_selection_end()
loc_db = LocationDB()
bs = bin_stream_ida()
machine = guess_machine(addr=start)
mdis = machine.dis_engine(bs, loc_db=loc_db)
if start == idc.BADADDR and end == idc.BADADDR:
start = idc.get_screen_ea()
end = idc.next_head(start) # Get next instruction address
mdis.dont_dis = [end]
asmcfg = mdis.dis_multiblock(start)
lifter_model_call = machine.lifter_model_call(loc_db=loc_db)
ircfg = lifter_model_call.new_ircfg_from_asmcfg(asmcfg)
print("Run symbolic execution...")
sb = SymbolicExecutionEngine(lifter_model_call, machine.mn.regs.regs_init)
sb.run_at(ircfg, start)
modified = {}
for dst, src in sb.modified(init_state=machine.mn.regs.regs_init):
modified[dst] = src
view = symbolicexec_t()
all_views.append(view)
if not view.Create(modified, machine, loc_db,
"Symbolic Execution - 0x%x to 0x%x"
% (start, idc.prev_head(end))):
return
view.Show()
# Support ida 6.9 and ida 7
all_views = []
hooks = Hooks()
hooks.hook()
action_expand = idaapi.action_desc_t(
'my:expand',
'Expand',
ActionHandlerExpand(),
'E',
'Expand expression',
50)
action_translate = idaapi.action_desc_t(
'my:translate',
'Translate',
ActionHandlerTranslate(),
'T',
'Translate expression in C/python/z3...',
103)
idaapi.register_action(action_expand)
idaapi.register_action(action_translate)
if __name__ == '__main__':
idaapi.compile_idc_text('static key_F3() { RunPythonStatement("symbolic_exec()"); }')
idc.add_idc_hotkey("F3", "key_F3")
print("=" * 50)
print("""Available commands:
symbolic_exec() - F3: Symbolic execution of current selection
""")