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VTree.py
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VTree.py
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# -*- coding: utf-8 -*-
"""
Created on Sat Sep 12 10:41:15 2020
@author: Sara Baradaran, Mahdi Heidari, Ali Kamali
"""
BUF_SYMBOLIC_BYTES = 100
MAX_STR_LEN = 100
import angr,pyvex,claripy
import networkx as nx
from .VNode import _VNode
from analysis.simprocedure.vul_strcpy import _strcpy_vul
from analysis.simprocedure.vul_strncpy import _strncpy_vul
from analysis.simprocedure.vul_strcat import _strcat_vul
from analysis.simprocedure.vul_strncat import _strncat_vul
from analysis.simprocedure.vul_memcpy import _memcpy_vul
from analysis.simprocedure.vul_memmove import _memmove_vul
from analysis.simprocedure.vul_memset import _memset_vul
from analysis.simprocedure.vul_sprintf import _sprintf_vul
from analysis.simprocedure.UnConstraintRetValue import ExeFunc
from analysis.simprocedure.wcslen import wcslen
import logging
from analysis.TypeUtils import *
import re
class _VTree(angr.Analysis):
def __init__(self,cfg_analyzer=None,solo=True,buf_symbolic_bytes=100, max_str_len=100):
global BUF_SYMBOLIC_BYTES, MAX_STR_LEN
logging.disable(logging.CRITICAL)
self._graph=nx.DiGraph()
self._root=None
self._func=None
self._inode=0
self._allvars=[]
self._is_static_vul=False
self._func_heap_wr_sites={}
self._func_stack_wr_sites={}
self._heap_wr_sites=[]
self._stack_wr_sites=[]
self._malloc_boundry=None
self._malloc_args=None
self.cfg_Analyzer=cfg_analyzer
self._init_hook()
self._vulReports=[]
self._vulConstNumb=0
self._generetedVulConst={}
self._loopsAddrs=[]
self._loopentries=[]
self._loop_breadedges=[]
self._loopsFirstNodes=[]
self._loopTerm=None
self._malloc_relativeAddr={}
self._stack_relativeAddr={}
self._activeWRmalloc_bnd={}
self._argv={}
self._solo=solo
self.PointerNum = 0
self.WFreeaddrs = {}
BUF_SYMBOLIC_BYTES = buf_symbolic_bytes
MAX_STR_LEN = max_str_len
def _init_hook(self):
self.project.hook_symbol('wcslen',wcslen())
self.project.hook_symbol('strcpy',_strcpy_vul())
self.project.hook_symbol('strncpy',_strncpy_vul())
self.project.hook_symbol('strcat',_strcat_vul())
self.project.hook_symbol('strncat',_strncat_vul())
self.project.hook_symbol('memcpy',_memcpy_vul())
self.project.hook_symbol('memmove',_memmove_vul())
self.project.hook_symbol('memset',_memset_vul())
self.project.hook_symbol('sprintf',_sprintf_vul())
def setupWFreeArgs(self,PointerNum, WFreeaddrs):
#print(f"[!] setupWFreeArgs: PointerNum: {PointerNum} and ")
#for addr, addrStatus in WFreeaddrs.items():
#print(f"\t{hex(addr)} : {addrStatus}")
self.PointerNum = PointerNum
self.WFreeaddrs = WFreeaddrs
def setupArgv(self,argv):
self._argv=argv
def _rehooking(self):
self.project.hook_symbol('wcslen',angr.SIM_PROCEDURES['libc']['strlen']())
self.project.hook_symbol('strcpy',angr.SIM_PROCEDURES['libc']['strcpy']())
self.project.hook_symbol('strncpy',angr.SIM_PROCEDURES['libc']['strncpy']())
self.project.hook_symbol('strcat',angr.SIM_PROCEDURES['libc']['strcat']())
self.project.hook_symbol('strncat',angr.SIM_PROCEDURES['libc']['strncat']())
self.project.hook_symbol('memcpy',angr.SIM_PROCEDURES['libc']['memcpy']())
self.project.hook_symbol('memset',angr.SIM_PROCEDURES['libc']['memset']())
self.project.hook_symbol('memmove',angr.SIM_PROCEDURES['libc']['memcpy']())
self.project.hook_symbol('sprintf',angr.SIM_PROCEDURES['libc']['sprintf']())
def setUpMallocRelativeAddr(self,address):
for m_addr,records in address:
self._malloc_relativeAddr[m_addr]=(claripy.BVV(records[1].con.value,64),records[2])
def setUpStackBufferRelativeAddr(self,address):
for m_addr,records in address:
self._stack_relativeAddr[m_addr]=(claripy.BVV(records[1].con.value,64),records[2])
def sefValspHeap(self,address):
for addr,wr_list in address:
if isinstance(wr_list,tuple):
func,cb_addr,tp = wr_list
if cb_addr not in self._func_heap_wr_sites.keys():
self._func_heap_wr_sites[cb_addr]=[func,(addr,tp)]
else:
tmp_res=(addr,tp)
if tmp_res not in self._func_heap_wr_sites.get(cb_addr):
self._func_heap_wr_sites.get(cb_addr).append((addr,tp))
else:
self._heap_wr_sites.append((addr,wr_list))
def sefValspStack(self,address):
for addr,wr_list in address:
if isinstance(wr_list,tuple):
func,cb_addr,tp = wr_list
if cb_addr not in self._func_stack_wr_sites.keys():
self._func_stack_wr_sites[cb_addr]=[func,(addr,tp)]
else:
tmp_res=(addr,tp)
if tmp_res not in self._func_stack_wr_sites.get(cb_addr):
self._func_stack_wr_sites.get(cb_addr).append((addr,tp))
else:
self._stack_wr_sites.append((addr,wr_list))
def setMallocArgs(self,malloc_args):
self._malloc_args=malloc_args
def setMallocBoundry(self,boundry):
self._malloc_boundry=boundry
def setStackBoundry(self,boundry):
self._stack_boundry=boundry
def _getVariableByName(self,name):
for var in self._allvars:
if name in var.variables:
return var
return None
def _preparingSoloMode(self):
start=self._func.startpoint.addr
end=self.cfg_Analyzer.getEndPoint(self._func.name)
for addr,func_name in self.cfg_Analyzer.remvoeSTLFunctionInList(self.cfg_Analyzer.getFunctionCalledBetweenBoundry(self._func.name,start,end)):
self.project.hook_symbol(func_name,ExeFunc())
def _clearSoloNodeEffect(self):
start=self._func.startpoint.addr
end=self.cfg_Analyzer.getEndPoint(self._func.name)
for addr,func_name in self.cfg_Analyzer.remvoeSTLFunctionInList(self.cfg_Analyzer.getFunctionCalledBetweenBoundry(self._func.name,start,end)):
self.project.unhook_symbol(func_name)
def getVarNames(self):
var_names=[]
for var in self._allvars:
name=list(var.variables)[0]
var_names.append(name)
return var_names
def generateForCallable(self,func,*args,loop_bound=100,VulnType):
self._func=func
if self._solo:
self._preparingSoloMode()
for arg in args:
if isinstance(arg,angr.calling_conventions.PointerWrapper):
self._allvars.append(arg.value)
else:
self._allvars.append(arg)
self._state=self.project.factory.call_state(func.addr,*args,add_options={angr.options.TRACK_CONSTRAINTS})
self._state.libc.buf_symbolic_bytes=BUF_SYMBOLIC_BYTES
self._state.libc.max_str_len=MAX_STR_LEN
self._state.globals['extra_const']=[]
self._simgr=self.project.factory.simulation_manager(self._state)
self._simgr.use_technique(angr.exploration_techniques.DFS())
self.anloops=self.project.analyses.LoopFinder(functions=[self._func])
if len(self.anloops.loops) > 0:
cfg = self.project.analyses.CFGFast(normalize=True)
self._simgr.use_technique(angr.exploration_techniques.LoopSeer(cfg=cfg, functions=func.name,use_header=True, bound=loop_bound,bound_reached=self.bnd_reached))
for loop in self.anloops.loops:
self._setLoopsBound(loop)
self._loopentries.append(loop.entry.addr)
self._extractLoopFirstNode(loop)
for en , ex in loop.break_edges:
self._loop_breadedges.append((en.addr,ex.addr))
end=self.cfg_Analyzer.getEndPoint(self._func.name)
self.NodeStatus=None
extConst = (VulnType < 2)
while len(self._simgr.active) > 0 :
act_state=self._simgr.active[0]
vul_const=None
if extConst and len(act_state.globals['extra_const'])>0:
rhs=act_state.globals['extra_const'].pop();
target_call_hist=self._correctHistory( act_state.globals['block_addr'] )
target_block_addr = target_call_hist[-1]
target_vul_state=self.cfg_Analyzer.getBlockRelatedToAddr(target_block_addr)
curr_wfCall=target_vul_state.instruction_addrs[-1]
iswchar=False
if 'iswchar' in act_state.globals.keys() and act_state.globals['iswchar']==True:
iswchar=True
if VulnType == 0 :
vul_const=self.setUpHeapVulConstraints(target_vul_state.vex,curr_wfCall,rhs,target_call_hist,'heap',iswchar)
elif VulnType == 1 :
vul_const=self.setUpStackVulConstraints(target_vul_state.vex,curr_wfCall,rhs,target_call_hist,'stack',iswchar)
self._collect(act_state,True,VulnType,extra_const=vul_const)
if act_state.addr == end :
self.NodeStatus=None
self._simgr.step()
#re_hooking
self._rehooking()
if self._solo:
self._clearSoloNodeEffect()
return self._graph
def bnd_reached(self,seer,succ_state):
state_addr=self._getExitNodeAddr(succ_state.addr)
if state_addr:
state=self.project.factory.blank_state(addr=state_addr,plugins=succ_state.plugins)
self._simgr.deferred.append(state)
def _getExitNodeAddr(self,addr):
for en_addr,ex_addr in self._loop_breadedges:
if addr == en_addr:
return ex_addr
def _isWrFuncCallForHeap(self,blk):
for addr , props in self._func_heap_wr_sites.items():
if addr in blk.instruction_addrs:
return addr
return None
def _isWrFuncCallForStack(self,blk):
for addr , props in self._func_stack_wr_sites.items():
if addr in blk.instruction_addrs:
return addr
return None
def _setLoopsBound(self,loop):
addr=[]
for loopNode in loop.body_nodes:
addr.append(loopNode.addr)
self._loopsAddrs.append(addr)
def _getVarCorrToMallocAddrs(self,m_addr):
for indx,addr in self._malloc_args.items():
if addr == m_addr:
return self._getVariableByName('var_{}'.format(indx))
def getNodeByInode(self,inode):
for node in self._graph.nodes:
if node.inode == inode:
return node
def CheckWfreeVuln(self, state, VulnType):
if not self.NodeStatus :
self.NodeStatus=[""]*self.PointerNum
history = state.history.bbl_addrs.hardcopy
for haddr in history:
addrStatus = self.WFreeaddrs.get(haddr, [] )
for pointerStatus in addrStatus:
self.NodeStatus[ pointerStatus[0] ] += pointerStatus[1]
addrStatus = self.WFreeaddrs.get(state.addr, [] )
for pointerStatus in addrStatus:
self.NodeStatus[ pointerStatus[0] ] += pointerStatus[1]
#print( hex(state.addr) , self.NodeStatus)
pattern = "100+$" if VulnType==2 else "02+$"
for i in self.NodeStatus :
if re.search(pattern, i) and self.WFreeaddrs.get(state.addr, None ):
#print("state = ", state.addr)
return True
return False
def _collect(self,state,status,VulnType,extra_const=None):
if len(self._graph.nodes) == 0:
self._root=_VNode(inode=self._inode,addr=state.addr,block=state.addr,constraints=state.solver.constraints,parent_addr=0,satisfiable=status)
self._inode= self._inode +1
self._graph.add_node( self._root)
self._checkForCalle(vex=state.block().vex,target=self._root)
self._root._has_child=True
if self._is_static_vul:
self._root.setVulSusp(True)
self._is_static_vul=False
if VulnType > 1 and self.CheckWfreeVuln(state, VulnType) :
self._root.setVulSusp(True)
self._vulConstNumb=self._vulConstNumb+1
if extra_const is not None :
vulConst,message=extra_const
self._root.addVulConstraint(vulConst)
self._root.setVulSusp(True)
self._root.addVulMessage(message)
self._vulConstNumb=self._vulConstNumb+1
if node.inode not in self._generetedVulConst.keys():
self._generetedVulConst[node.inode]=[]
self._generetedVulConst.get(self._root.inode).append(vulConst)
##
stack_values=self.cfg_Analyzer.getSimpleWrINStackFor(self._func.name,block=state.block())
self._root._setUpStack(stack_values)
wr_st_maps=self._getWrSiteINState(state)
if len(wr_st_maps) > 0:
self._checkWrSiteVul(state,wr_st_maps)
else:
if (VulnType < 2) and self._isInCallableBoundry(self._func,state.addr) == False:
return
if (VulnType >= 2) and self.project._sim_procedures.get(state.addr, None ):
return
parent,parent_add,path=self._findParent(state)
node=_VNode(inode=self._inode,addr=state.addr,block=state.addr,parent_addr=parent_add,satisfiable=status)
node.addConstraints(state.solver.constraints,parent)
###
stack_values=self.cfg_Analyzer.getSimpleWrINStackFor(self._func.name,block=state.block())
node._setUpStack(stack_values,parent._stack)
wr_st_maps=self._getWrSiteINState(state)
if len(wr_st_maps) > 0:
self._checkWrSiteVul(node._stack,state,wr_st_maps)
flag=False
if len(self._loopsAddrs) > 0:
if self._isINLoop(state.addr):
flag=True
isEntry=node.addr in self._loopentries
isFirstNode= node.addr in self._loopsFirstNodes
if isEntry:
self._loopTerm=None
if isFirstNode:
if len(node.Term)> 0:
self._loopTerm=node.Term
for p_node in path:
if p_node.isEqual(node,isEntryLoop=isEntry):
if self._loopTerm:
p_node.constraints.extend(self._loopTerm)
if isFirstNode:
p_node.Term.extend(self._loopTerm)
parent.addBlock(state.addr)
parent._correctStack(node._stack)
return
if len(node.Term) == 0 and flag == False:
parent.addBlock(state.addr)
parent._correctStack(node._stack)
if self._is_static_vul:
parent.setVulSusp(True)
self._is_static_vul=False
if VulnType > 1 and self.CheckWfreeVuln(state, VulnType) :
parent.setVulSusp(True)
self._vulConstNumb=self._vulConstNumb+1
if extra_const is not None :
vulConst,message=extra_const
parent.setVulSusp(True)
parent.addVulConstraint(vulConst)
parent.addVulMessage(message)
self._vulConstNumb=self._vulConstNumb+1
if parent.inode not in self._generetedVulConst.keys():
self._generetedVulConst[parent.inode]=[]
self._generetedVulConst.get(parent.inode).append(vulConst)
if state.block().vex.jumpkind == 'Ijk_Ret' or status == False:
parent._has_child=False
else:
parent._has_child=True
parent.setSatisfaiablilyStatus(status)
del(node)
return
else :
if self._is_static_vul:
node.setVulSusp(True)
self._is_static_vul=False
if VulnType > 1 and self.CheckWfreeVuln(state, VulnType) :
node.setVulSusp(True)
self._vulConstNumb=self._vulConstNumb+1
if extra_const is not None :
vulConst,message=extra_const
node.addVulConstraint(vulConst)
node.setVulSusp(True)
node.addVulMessage(message)
self._vulConstNumb=self._vulConstNumb+1
if node.inode not in self._generetedVulConst.keys():
self._generetedVulConst[node.inode]=[]
self._generetedVulConst.get(node.inode).append(vulConst)
self._checkForCalle(vex=state.block().vex,target=node)
self._graph.add_edge( parent,node)
self._inode= self._inode +1
if state.block().vex.jumpkind == 'Ijk_Ret' or status == False:
node._has_child=False
else:
node._has_child=True
def _getWrSiteINState(self,state):
res={}
if len(self._heap_wr_sites)>0:
inst_addrs=state.block().instruction_addrs
for base_addr,list_wr_addrs in self._heap_wr_sites:
for wr_addr in list_wr_addrs:
if wr_addr in inst_addrs:
if base_addr not in res.keys():
res[base_addr]=[wr_addr]
else:
res[base_addr].append(wr_addr)
return res
def _checkWrSiteVul(self,current_stack,state,wr_sites):
if self._isINLoop(state.addr):
pass
else:
for m_addr,wr_list in wr_sites.items():
for wr_addr in wr_list:
self._checkForFixIndexAccess(current_stack,m_addr,wr_addr,state)
def _checkForFixIndexAccess(self,current_stack,m_addr,wr_addr,state):
index=self.cfg_Analyzer._isFixedIndexAccess(self._func.name,wr_addr,state.block().vex,list(current_stack.items()))
malloc_size=self._malloc_boundry[m_addr]
if index and index >= malloc_size:
message='There is a Buffer Overflow in block {} with constant write '.format(wr_addr)
if message not in self._vulReports:
self._vulReports.append(message)
#Extra check for fixed argumnet
for addr,caller in self.cfg_Analyzer.getCaller(self._func.name):
fixed_args=self.cfg_Analyzer._getFixArgcOnStack(caller.name,self._func.name)
new_stack={}
for addr,value in fixed_args.items():
if addr not in current_stack.keys():
new_stack[addr]=value
index=self.cfg_Analyzer._isFixedIndexAccess(self._func.name,wr_addr,state.block().vex,list(new_stack.items()))
malloc_size=self._malloc_boundry[m_addr]
if index and index >= malloc_size:
message='There is a Buffer Overflow in block {} with constant write '.format(wr_addr)
if message not in self._vulReports:
self._vulReports.append(message)
def _extractLoopFirstNode(self,loop):
for en,ex in loop.graph.edges:
en_addr=en.addr
try:
ex_addr=ex.addr
except:
print("no addr")
if en_addr in self._loopentries:
if (en_addr,ex_addr) not in self._loop_breadedges:
self._loopsFirstNodes.append(ex_addr)
return
def _isINLoop(self,addr):
for loopaddrs in self._loopsAddrs:
if addr in loopaddrs:
return True
return False
def _checkForCalle(self,vex,target):
if 'Ijk_Call' in vex.constant_jump_targets_and_jumpkinds.values():
addr=list(vex.constant_jump_targets)[0]
target._addCallee(addr)
def getStoreDataAtAddress(self,vex,addr):
visited=False
target_store=None
for stmt in vex.statements:
if stmt.tag == 'Ist_IMark':
if stmt.addr == addr:
visited=True
else:
visited=False
if visited==True :
if isinstance(stmt,pyvex.IRStmt.Store):
target_store=stmt
return target_store.data
def _isInCallableBoundry(self,func,target_addr):
for i in func.blocks:
if target_addr in i.instruction_addrs:
return True
return False
def getNodeByIndex(self,index):
return list(self._graph.nodes)[index]
def _correctHistory(self,bbl_addrs):
hist=[]
for addr in bbl_addrs:
if self._isInCallableBoundry(self._func,addr):
hist.append(addr)
return hist
def _findParent(self,state):
hist=self._correctHistory(state.history.bbl_addrs.hardcopy)
parent=self._root
path=[parent]
active=hist.pop(0)
while len(hist)>0:
childs=self._successors(parent,depth_limit=1)
active=hist.pop(0)
for child in childs:
if active in child.blocks:
parent=child
path.append(parent)
break
return parent,active,path
def getAllPaths(self):
"""
get All path of an DiGraph
"""
roots = (v for v, d in self._graph.in_degree() if d == 0)
leaves = [v for v, d in self._graph.out_degree() if d == 0]
all_paths = []
for root in roots:
paths = nx.all_simple_paths(self._graph, root, leaves)
all_paths.extend(paths)
return all_paths
def getVulSupsPaths(self):
paths=[]
for path in self.getAllPaths():
for node in path :
if node._vul_susp:
paths.append(path)
break
return paths
def isInVulSupsPath(self,inode):
for path in self.getVulSupsPaths():
for node in path :
if node.inode == inode:
return True
return False
def _path_str_(self,path):
l=[]
for node in path:
l.append(str(node.inode))
print(' \u2192 '.join(l))
del(l)
def _successors(self,parent,depth_limit):
return list(nx.bfs_successors(self._graph,parent,depth_limit=depth_limit))[0][1]
def _parent(self,target_node):
parent=nx.predecessor(self._graph,source=self._root,target=target_node)
if len(parent) > 0:
return parent[0]
else:
return target_node
def setUpHeapVulConstraints(self,curr_wfCall_vb,curr_wfCall,rhs,hist_call,buff_type,iswchar=False,):
#print(self._func_heap_wr_sites.keys())
if curr_wfCall in self._func_heap_wr_sites.keys():
props=self._func_heap_wr_sites[curr_wfCall]
#print(' *** props : ' ,props)
if props[0] == 'strcpy':
return self._getVulConstraintsForStrcpy(curr_wfCall_vb,props,rhs,hist_call,buff_type)
if props[0] == 'strcat':
return self._getVulConstraintsForStrcat(curr_wfCall_vb,props,rhs,hist_call,buff_type)
if props[0] == 'strncpy':
return self._getVulConstraintsForStrncpy(curr_wfCall_vb,props,rhs,hist_call,buff_type)
if props[0] == 'strncat':
return self._getVulConstraintsForStrncat(curr_wfCall_vb,props,rhs,hist_call,buff_type)
if props[0] == 'memcpy' or props[0] == 'memmove':
return self._getVulConstraintsForMemcpy(curr_wfCall_vb,props,rhs,hist_call,buff_type,wchar=iswchar)
if props[0] == 'memset':
return self._getVulConstraintsForMemset(curr_wfCall_vb,props,rhs,hist_call,buff_type,wchar=iswchar)
if props[0] == 'sprintf':
return self._getVulConstraintsForSprintf(curr_wfCall_vb,props,rhs,hist_call,buff_type)
def setUpStackVulConstraints(self,curr_wfCall_vb,curr_wfCall,rhs,hist_call,buff_type,iswchar=False):
#print(self._func_stack_wr_sites.keys())
if curr_wfCall in self._func_stack_wr_sites.keys():
props=self._func_stack_wr_sites[curr_wfCall]
#print(' *** props : ' ,props)
if props[0] == 'strcpy':
return self._getVulConstraintsForStrcpy(curr_wfCall_vb,props,rhs,hist_call,buff_type)
if props[0] == 'strcat':
return self._getVulConstraintsForStrcat(curr_wfCall_vb,props,rhs,hist_call,buff_type)
if props[0] == 'strncpy':
return self._getVulConstraintsForStrncpy(curr_wfCall_vb,props,rhs,hist_call,buff_type)
if props[0] == 'strncat':
return self._getVulConstraintsForStrncat(curr_wfCall_vb,props,rhs,hist_call,buff_type)
if props[0] == 'memcpy' or props[0] == 'memmove':
return self._getVulConstraintsForMemcpy(curr_wfCall_vb,props,rhs,hist_call,buff_type,wchar=iswchar)
if props[0] == 'memset':
return self._getVulConstraintsForMemset(curr_wfCall_vb,props,rhs,hist_call,buff_type,wchar=iswchar)
if props[0] == 'sprintf':
return self._getVulConstraintsForSprintf(curr_wfCall_vb,props,rhs,hist_call,buff_type)
def _getVulConstraintsForSprintf(self,vex,props,rhs,history_blocks,buff_type):
func_name,out_str=rhs
if isinstance(out_str,str):
dst_size=self._getSRCorDSTsize('sprintf',vex,props,'dst',history_blocks,buff_type)
if dst_size:
if len(out_str) > dst_size:
self._is_static_vul=True
self._vulReports.append('There is a Buffer Overflow in block {} with target function sprintf '.format(vex.addr))
def _getVulConstraintsForMemset(self,vex,props,rhs,history_blocks,buff_type,wchar=False):
func_name,num=rhs
dst_size=self._getSRCorDSTsize('memset',vex,props,'dst',history_blocks,buff_type,iswhar=wchar)
if dst_size:
message='There is a Buffer Overflow in block {} with target function memset '.format(vex.addr)
if isinstance(num,int):
if num > dst_size:
self._is_static_vul=True
self._vulReports.append(message)
else:
return (num > dst_size,message)
def _getVulConstraintsForStrncpy(self,vex,props,rhs,history_blocks,buff_type):
func_name,limit=rhs
message='There is a Buffer Overflow in block {0} with target function {1}'.format(vex.addr,props[0])
if isinstance(limit,int):
dst_size=self._getSRCorDSTsize(func_name,vex,props,'dst',history_blocks,buff_type)
#print("dst_size:", dst_size)
if dst_size:
if limit > dst_size:
self._is_static_vul=True
self._vulReports.append(message)
else:
dst_size=self._getSRCorDSTsize(func_name,vex,props,'dst',history_blocks,buff_type)
src_size=self._getSRCorDSTsize(func_name,vex,props,'src',history_blocks,buff_type)
#print("dst_size:", dst_size)
#print("src_size:", src_size)
if dst_size and src_size:
const=[limit <= src_size ,limit > dst_size]
return (claripy.And(*const),message)
def _getVulConstraintsForStrncat(self,vex,props,rhs,history_blocks,buff_type):
func_name,limit=rhs
message='There is a Buffer Overflow in block {0} with target function {1}'.format(vex.addr,props[0])
if isinstance(limit,int):
dst_size=self._getSRCorDSTsize(func_name,vex,props,'dst',history_blocks,buff_type)
#print("dst_size:", dst_size)
if dst_size:
if limit > dst_size:
self._is_static_vul=True
self._vulReports.append(message)
else:
dst_size=self._getSRCorDSTsize(func_name,vex,props,'dst',history_blocks,buff_type)
src_size=self._getSRCorDSTsize(func_name,vex,props,'src',history_blocks,buff_type)
#print("dst_size:", dst_size)
#print("src_size:", src_size)
if dst_size and src_size:
const=[limit > dst_size - dst_len ,limit <= dst_size]
return (claripy.And(*const),message)
def _getVulConstraintsForMemcpy(self,vex,props,rhs,history_blocks,buff_type,wchar=False):
func_name,limit=rhs
message='There is a Buffer Overflow in block {0} with target function {1}'.format(vex.addr,props[0])
if isinstance(limit,int):
dst_size=self._getSRCorDSTsize(func_name,vex,props,'dst',history_blocks,buff_type,iswhar=wchar)
#print("dst_size:", dst_size," " , limit)
if dst_size:
if limit > dst_size:
self._is_static_vul=True
self._vulReports.append(message)
else:
dst_size=self._getSRCorDSTsize(func_name,vex,props,'dst',history_blocks,buff_type,iswhar=wchar)
src_size=self._getSRCorDSTsize(func_name,vex,props,'src',history_blocks,buff_type,iswhar=wchar)
#print("dst_size:", dst_size)
#print("src_size:", src_size)
if dst_size and src_size:
const=[limit <= src_size ,limit > dst_size]
return (claripy.And(*const),message)
def _getVulConstraintsForStrcpy(self,vex,props,rhs,history_blocks,buff_type):
message='There is a Buffer Overflow in block {} with target function strcpy'.format(vex.addr)
if isinstance(rhs,str):
dst_size=self._getSRCorDSTsize('strcpy',vex,props,'dst',history_blocks,buff_type)
#print("dst_size:", dst_size)
#print("src_size:", src_size)
if dst_size:
len_rhs=len(rhs)
if len_rhs >= dst_size:
self._is_static_vul=True
self._vulReports.append(message)
else:
src_size=self._getSRCorDSTsize('strcpy',vex,props,'src',history_blocks,buff_type)
dst_size=self._getSRCorDSTsize('strcpy',vex,props,'dst',history_blocks,buff_type)
#print("dst_size:", dst_size)
#print("src_size:", src_size)
const=[]
if src_size and dst_size:
if src_size < dst_size:
return None
const.append(claripy.UGT(rhs ,dst_size))
#const.append(claripy.ULE(rhs,src_size))
return (claripy.And(*const),message)
elif dst_size:
const.append(claripy.UGT(rhs ,dst_size))
#const.append(claripy.ULE(rhs,src_size))
return (claripy.And(*const),message)
def _getVulConstraintsForStrcat(self,vex,props,rhs,history_blocks,buff_type):
func_name,dst_len,src_len=rhs
message='There is a Buffer Overflow in block {} with target function strcat'.format(vex.addr)
if isinstance(src_len,int):
dst_size=self._getSRCorDSTsize('strcat',vex,props,'dst',history_blocks,buff_type)
if dst_size:
if src_len > dst_size :
self._is_static_vul=True
self._vulReports.append(message)
else:
const=dst_size - dst_len < src_len
if 'BoolV' == const.op and const.is_false():
return
return (const,message)
else:
src_size=self._getSRCorDSTsize('strcat',vex,props,'src',history_blocks,buff_type)
dst_size=self._getSRCorDSTsize('strcat',vex,props,'dst',history_blocks,buff_type)
#print("dst_size:", dst_size)
#print("src_size:", src_size)
#print("dest_len:", dst_len)
if src_size and dst_size:
const=[dst_size - dst_len < src_len , src_len < src_size]
#print('const ' , const)
return (claripy.And(*const),message)
elif dst_size:
const=[src_len > dst_size]
#print('const 2 : ',const)
return (claripy.And(*const),message)
def _getSRCorDSTsize(self,func_name,vex,props,arg_type,history_blocks,buff_type,iswhar=False):
res_addr=None
tmp_props_addr=[]
is_inFunc=True
for addr,tp in props[1:]:
if tp == arg_type:
try:
if self._func.name !=self.cfg_Analyzer.resolveAddrByFunction(addr).name :
is_inFunc=False
except:
print(' ')
tmp_props_addr.append(addr)
if len(tmp_props_addr) == 1:
res_addr=tmp_props_addr.pop()
elif len(tmp_props_addr) > 1 :
if is_inFunc:
res_addr=self._getCurrectADdrBasedInHistory(history_blocks,tmp_props_addr)
else:
r = tmp_props_addr.pop()
if r in self._malloc_boundry.keys():
buffer_size=self._malloc_boundry[r]
else:
buffer_size=self._stack_boundry[str(self._func.name) + '-' + str(r)]
for addr in tmp_props_addr:
if addr in self._malloc_boundry.keys():
malloc_addr=self._malloc_boundry[addr]
else:
malloc_addr=self._stack_boundry[str(self._func.name) + '-' + str(addr)]
if arg_type == 'src':
if malloc_addr >= buffer_size:
res_addr=addr
buffer_size=malloc_addr
else:
if malloc_addr <= buffer_size:
res_addr=addr
buffer_size=malloc_addr
if res_addr is None :
if arg_type == 'src':
return self._getArgvSizeForSRC(self._func.name,func_name,vex)
else:
return None
arg_index=1 if arg_type=='src' else 0
if res_addr in self._malloc_boundry.keys():
res_size=self._malloc_boundry[res_addr]
else:
res_size=self._stack_boundry[str(self._func.name) + '-' + str(res_addr)]
if buff_type == 'heap':
arg_indexing=self.cfg_Analyzer._trackInputOfFuncionCall(vex,arg_index,self.cfg_Analyzer.getFuncAddress(func_name),just_index=True)
if arg_indexing is not None:
res_size=res_size - arg_indexing[1].con.value
if iswhar:
res_size=int(res_size/4)
return res_size
def _getArgvSizeForSRC(self,func_name,target_func,vex):
target_funAddr=self.cfg_Analyzer.getFuncAddress(target_func)
argc=self.cfg_Analyzer.getArgsCC(vex,target_funAddr)
maps=self._getMapForArgv(func_name)
index=None
map_index={}
for chainCnt,props in maps.items():
if func_name in props.keys():
for prp in props[func_name]:
reg,addr,opr=prp
argc_reg,argc_addr,argc_opr=argc[1]
if addr.con.value == argc_addr.con.value:
map_index[chainCnt]=props[func_name].index(prp)
if len(map_index) > 0:
chains=list(set(self.cfg_Analyzer.getCallChain(func_name)))
for chainIndx,index in map_index.items():
target_chain=chains[chainIndx]
items=target_chain.split('-')
target_regname=maps[chainIndx].get(func_name)[index][0]
argcArgsTrack=self.cfg_Analyzer.checkForArgvAsArgument(items[1])
if len(argcArgsTrack)==1:
for addr,argv_props in argcArgsTrack.items():
for argv_idx,argv_reg in argv_props:
return self._argv[argv_idx]
#if argv_reg == target_regname:
# return self._argv[argv_idx]
else:
raise Exception("Not Support")
def _getMapForArgv(self,func_name):
chains=set(self.cfg_Analyzer.getCallChain(func_name))
maps={}
count=0
for chain in chains:
items=chain.split('-')
if len(items) < 2:
count=count+1
continue
caller=items.pop(0)
callee=items.pop(0)
maps[count]={}
argv=self.cfg_Analyzer.getArgvAddrsOnStack()
if argv is None:
count=count+1
continue
maps[count][caller]=[argv]
while True:
for addr ,props in self.cfg_Analyzer._mapRegccInCalleeAndCaller(caller,callee,maps[count].get(caller)):
if len(props) > 0 :
maps[count][callee]=props
if len(items) ==0 : break
caller=callee
callee=items.pop(0)
count=count+1
return maps
def _getCurrectADdrBasedInHistory(self,history_blocks,target_addrs):
tmp_res={}
index=0
for blck_addr in history_blocks:
block=self.cfg_Analyzer.getBlockRelatedToAddr(blck_addr)
for addr in target_addrs:
if addr in block.instruction_addrs:
tmp_res[addr]=index
index=index+1
m_index=-1
m_addr=-1
while len(tmp_res)>0:
addr,index=tmp_res.popitem()
if index > m_index:
m_index=index
m_addr=addr
return addr