#!/usr/bin/python """ Scyther : An automatic verifier for security protocols. Copyright (C) 2007 Cas Cremers This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. """ #--------------------------------------------------------------------------- """ Import externals """ import wx import threading #--------------------------------------------------------------------------- """ Import scyther components """ import Scyther.Scyther import Scyther.Error from Scyther.Misc import * """ Import scyther-gui components """ import Preference import Attackwindow import Icon import Error import Makeimage #--------------------------------------------------------------------------- if Preference.havePIL: import Image #--------------------------------------------------------------------------- class ScytherThread(threading.Thread): """ Apply Scyther algorithm to input and retrieve results """ # Override Thread's __init__ method to accept the parameters needed: def __init__ ( self, spdl, options="", callback=None, mode=None ): self.spdl = spdl self.options = options self.callback = callback self.mode = mode threading.Thread.__init__ ( self ) def run(self): (scyther, claims, summary) = self.claimResults() # Results are done (claimstatus can be reported) if self.callback: wx.CallAfter(self.callback, scyther, claims, summary) def claimFixViewOne(self,claims): """ This is a stupid hack as long as switches.useAttackBuffer in Scyther C code is false. It is currently false because Windows VISTA screwed up the standard C function tmpfile() (It's in a directory to which normal users cannot write...) """ # TODO Notice the stupid default setting too ('2') which is # needed here. This really needs cleanup. if int(Preference.get('prune','2')) != 0: if claims: for cl in claims: if len(cl.attacks) > 1: # Fix it such that by default, only the best attack is # shown, unless we are in characterize or check mode # TODO [X] [CC] make switch-dependant. if not self.mode in ["characterize","check"]: cl.attacks = [cl.attacks[-1]] """ Cutting invalidates exactness of attack/behaviour counts """ cl.complete = False return claims def claimResults(self): """ Convert spdl to result (using Scyther) """ scyther = Scyther.Scyther.Scyther() scyther.options = self.options scyther.setInput(self.spdl) # verification start try: claims = scyther.verify() except Scyther.Error.ScytherError, el: claims = None pass summary = str(scyther) claims = self.claimFixViewOne(claims) return (scyther, claims, summary) #--------------------------------------------------------------------------- class AttackThread(threading.Thread): """ This is a thread because it computes images from stuff in the background """ # Override Thread's __init__ method to accept the parameters needed: def __init__ ( self, parent, resultwin, callbackclaim=None,callbackattack=None,callbackdone=None ): self.parent = parent self.resultwin = resultwin self.callbackclaim = callbackclaim self.callbackattack = callbackattack self.callbackdone = callbackdone self.totalattacks = 0 for cl in self.parent.claims: for attack in cl.attacks: self.totalattacks += 1 threading.Thread.__init__ ( self ) def run(self): # create the images in the background # when the images of a claim are done, callback is called with # the claim self.makeImages() def makeImages(self): """ create images """ done = 0 for cl in self.parent.claims: for attack in cl.attacks: Makeimage.makeImage(attack,self) done += 1 if self.callbackattack: wx.CallAfter(self.callbackattack,attack,self.totalattacks,done) if self.callbackclaim: wx.CallAfter(self.callbackclaim,cl) if self.callbackdone: wx.CallAfter(self.callbackdone) #--------------------------------------------------------------------------- class VerificationWindow(wx.Dialog): def __init__( self, parent, title, pos=wx.DefaultPosition, size=wx.DefaultSize, style=wx.DEFAULT_DIALOG_STYLE ): wx.Dialog.__init__(self,parent,-1,title,pos,size,style) sizer = wx.BoxSizer(wx.VERTICAL) label = wx.StaticText(self, -1, "Verifying protocol description") sizer.Add(label, 0, wx.ALIGN_CENTRE|wx.ALL, 5) line = wx.StaticLine(self, -1, size=(20,-1), style=wx.LI_HORIZONTAL) sizer.Add(line, 0, wx.GROW|wx.ALIGN_CENTER_VERTICAL|wx.RIGHT|wx.TOP, 5) btnsizer = wx.StdDialogButtonSizer() btn = wx.Button(self, wx.ID_CANCEL) btnsizer.AddButton(btn) btnsizer.Realize() sizer.Add(btnsizer, 0, wx.ALIGN_CENTER_VERTICAL|wx.ALL|wx.ALIGN_CENTER, 5) self.SetSizer(sizer) sizer.Fit(self) #--------------------------------------------------------------------------- class ErrorWindow(wx.Dialog): def __init__( self, parent, title, pos=wx.DefaultPosition, size=wx.DefaultSize, style=wx.DEFAULT_DIALOG_STYLE,errors=[] ): wx.Dialog.__init__(self,parent,-1,title,pos,size,style) sizer = wx.BoxSizer(wx.VERTICAL) label = wx.StaticText(self, -1, "Errors") sizer.Add(label, 0, wx.ALIGN_LEFT|wx.ALL, 5) line = wx.StaticLine(self, -1, size=(20,-1), style=wx.LI_HORIZONTAL) sizer.Add(line, 0, wx.GROW|wx.ALIGN_CENTER_VERTICAL|wx.RIGHT|wx.TOP, 5) etxt = "" prefix = "error: " for er in errors: if er.startswith(prefix): er = er[len(prefix):] etxt = etxt + "%s\n" % (er) label = wx.StaticText(self, -1, etxt) sizer.Add(label, 0, wx.ALIGN_LEFT|wx.ALL, 5) line = wx.StaticLine(self, -1, size=(20,-1), style=wx.LI_HORIZONTAL) sizer.Add(line, 0, wx.GROW|wx.ALIGN_CENTER_VERTICAL|wx.RIGHT|wx.TOP, 5) btnsizer = wx.StdDialogButtonSizer() btn = wx.Button(self, wx.ID_OK) btnsizer.AddButton(btn) btnsizer.Realize() sizer.Add(btnsizer, 0, wx.ALIGN_CENTER_VERTICAL|wx.ALL|wx.ALIGN_CENTER, 5) self.SetSizer(sizer) sizer.Fit(self) #--------------------------------------------------------------------------- class ResultWindow(wx.Frame): """ Displays the claims status and contains buttons to show the actual attack graphs """ def __init__( self, parent, parentwindow, title, pos=wx.DefaultPosition, size=wx.DefaultSize, style=wx.DEFAULT_DIALOG_STYLE ): wx.Frame.__init__(self,parentwindow,-1,title,pos,size,style) Icon.ScytherIcon(self) self.parent = parent self.thread = None self.Bind(wx.EVT_CLOSE, self.onCloseWindow) self.CreateStatusBar() self.BuildTable() def onViewButton(self,evt): btn = evt.GetEventObject() try: w = Attackwindow.AttackWindow(btn.claim) w.Show(True) except Error.PILError: Error.ShowAndReturn("Problem with PIL imaging library: disabled zooming. Please retry to verify the protocol again.") self.onCloseWindow(None) def onCloseWindow(self,evt): """ TODO we should kill self.thread """ # Clean up self.parent.claims = None self.Destroy() def BuildTable(self): # Now continue with the normal construction of the dialog # contents # For these claims... claims = self.parent.claims # set up grid self.grid = grid = wx.GridBagSizer(0,0) #self.grid = grid = wx.GridBagSizer(7,1+len(claims)) def titlebar(x,title,width=1): txt = wx.StaticText(self,-1,title) font = wx.Font(14,wx.NORMAL,wx.NORMAL,wx.BOLD) txt.SetFont(font) grid.Add(txt,(0,x),(1,width),wx.ALL,10) titlebar(0,"Claim",4) titlebar(4,"Status",2) titlebar(6,"Comments",1) self.lastprot = None self.lastrole = None views = 0 for index in range(0,len(claims)): views += self.BuildClaim(grid,claims[index],index+1) if views > 0: titlebar(7,"Patterns",1) self.SetSizer(grid) self.Fit() def BuildClaim(self,grid,cl,ypos): # a support function def addtxt(txt,column): txt = txt.replace("-","_") # Strange fix for wx.StaticText as it cuts off the display. grid.Add(wx.StaticText(self,-1,txt),(ypos,column),(1,1),wx.ALIGN_CENTER_VERTICAL|wx.ALL,10) n = len(cl.attacks) xpos = 0 # protocol, role, label prot = str(cl.protocol) showP = False showR = False if prot != self.lastprot: self.lastprot = prot showP = True showR = True role = str(cl.role) if role != self.lastrole: self.lastrole = role showR = True if showP: addtxt(prot,xpos) if showR: addtxt(role,xpos+1) xpos += 2 # claim id addtxt(str(cl.id),xpos) xpos += 1 # claim parameters claimdetails = str(cl.claimtype) if cl.parameter: claimdetails += " %s" % (cl.parameter) addtxt(claimdetails + " ",xpos) xpos += 1 # button for ok/fail if None: # old style buttons (but they looked ugly on windows) tsize = (16,16) if cl.okay: bmp = wx.ArtProvider_GetBitmap(wx.ART_TICK_MARK,wx.ART_CMN_DIALOG,tsize) else: bmp = wx.ArtProvider_GetBitmap(wx.ART_CROSS_MARK,wx.ART_CMN_DIALOG,tsize) if not bmp.Ok(): bmp = wx.EmptyBitmap(tsize) bmpfield = wx.StaticBitmap(self,-1,bmp) grid.Add(bmpfield,(ypos,xpos),(1,1),wx.ALIGN_CENTER_VERTICAL|wx.ALL,10) else: # new style text control Ok/Fail rankc = cl.getColour() rankt = cl.getOkay() txt = wx.StaticText(self,-1,rankt) font = wx.Font(11,wx.NORMAL,wx.NORMAL,wx.BOLD) txt.SetFont(font) txt.SetForegroundColour(rankc) grid.Add(txt,(ypos,xpos),(1,1),wx.ALL,10) xpos += 1 # verified? vt = cl.getVerified() if vt: addtxt(vt,xpos) xpos += 1 # remark something addtxt(cl.getComment(),xpos) xpos += 1 # add view button (enabled later if needed) if n > 0: cl.button = wx.Button(self,-1,"%i %s" % (n,cl.stateName(n))) cl.button.claim = cl grid.Add(cl.button,(ypos,xpos),(1,1),wx.ALIGN_CENTER_VERTICAL|wx.ALL,5) cl.button.Disable() if n > 0: # Aha, something to show self.Bind(wx.EVT_BUTTON, self.onViewButton,cl.button) else: cl.button = None xpos += 1 # Return 1 if there is a view possible if n > 0: return 1 else: return 0 #--------------------------------------------------------------------------- class ScytherRun(object): def __init__(self,mainwin,mode,spdl,errorcallback=None): self.mainwin = mainwin self.mode = mode self.spdl = spdl self.verified = False self.options = mainwin.settings.ScytherArguments(mode) self.errorcallback=errorcallback self.main() def main(self): """ Start process """ title = "Running Scyther %s process" % self.mode # start the window and show until something happens # if it terminates, this is a cancel, and should also kill the thread. (what happens to a spawned Scyther in that case?) # if the thread terminames, it should close the window normally, and we end up here as well. #val = self.verifywin.ShowModal() self.verifywin = VerificationWindow(self.mainwin,title) self.verifywin.Center() self.verifywin.Show(True) # Check sanity of Scyther thing here (as opposed to the thread) # which makes error reporting somewhat easier try: Scyther.Scyther.Check() except Scyther.Error.BinaryError, e: # e.file is the supposed location of the binary text = "Could not find Scyther binary at\n%s" % (e.file) Error.ShowAndExit(text) # start the thread self.verifywin.SetCursor(wx.StockCursor(wx.CURSOR_WAIT)) t = ScytherThread(self.spdl, self.options, self.verificationDone, self.mode) t.start() # after verification, we proceed to the callback below... def verificationDone(self, scyther, claims, summary): """ This is where we end up after a callback from the thread, stating that verification succeeded. """ self.scyther = scyther self.claims = claims self.summary = summary self.verified = True self.verifywin.Close() # Process the claims if self.scyther.errorcount == 0: self.verificationOkay() else: self.verificationErrors() def verificationOkay(self): # Great, we verified stuff, progress to the claim report title = "Scyther results : %s" % self.mode self.resultwin = resultwin = ResultWindow(self,self.mainwin,title) def attackDone(attack,total,done): if resultwin: txt = "Generating attack graphs (%i of %i done)." % (done,total) resultwin.SetStatusText(txt) #resultwin.Refresh() def claimDone(claim): if resultwin: if claim.button and len(claim.attacks) > 0: claim.button.Enable() def allDone(): if resultwin: resultwin.SetCursor(wx.StockCursor(wx.CURSOR_ARROW)) resultwin.SetStatusText("Done.") resultwin.Center() resultwin.Show(True) resultwin.SetCursor(wx.StockCursor(wx.CURSOR_ARROWWAIT)) wx.Yield() t = AttackThread(self,resultwin,claimDone,attackDone,allDone) t.start() resultwin.thread = t def verificationErrors(self): """ Verification process generated errors. Show them. """ if self.errorcallback: self.errorcallback(self.scyther.errors) title = "Scyther errors : %s" % self.mode errorwin = ErrorWindow(self.mainwin,title,errors=self.scyther.errors) errorwin.Center() val = errorwin.ShowModal() #--------------------------------------------------------------------------- # vim: set ts=4 sw=4 et list lcs=tab\:>-: