497 lines
13 KiB
Python
Executable File
497 lines
13 KiB
Python
Executable File
#!/usr/bin/python
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#
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# Multi-protocol test using Scyther
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#
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# (c)2004 Cas Cremers
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#
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# ***********************
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# MODULES
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# ***********************
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import os
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import sys
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import string
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import commands
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import copy
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from optparse import OptionParser
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# My own stuff
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import tuplesdo
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import scythertest
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import protocollist
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# ***********************
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# PARAMETERS
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# ***********************
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ClaimToResultMap = {} # maps protocol claims to correctness in singular tests (0,1)
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ProtocolToFileMap = {} # maps protocol names to file names
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ProtocolToStatusMap = {} # maps protocol names to status: 0 all false, 1 all correct, otherwise (2) mixed
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ProtocolToEffectsMap = {} # maps protocols that help create multiple flaws, to the protocol names of the flaws they caused
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CommandPrefix = ""
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ArgumentsList = [] # argument lists that have been displayed onscreen
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# Ugly hack. Works.
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safetxt = " " * 20
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# ***********************
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# LIBS
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# ***********************
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# GetKeys
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#
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# Given a mapping f and a value x, returns a list of keys
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# k for which f(k) = x
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def GetKeys (f, x):
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res = []
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for k in f.keys():
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if f[k] == x:
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res.append(k)
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return res
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# GetListKeys
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#
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# Given a mapping f and a list l, returns a list of keys
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# k for which f(k) = x, x in l
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def GetListKeys (f, l):
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res = []
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for x in l:
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for y in GetKeys (f, x):
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if y not in res:
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res.append(y)
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return res
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# CommandLine
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#
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# Yield the commandline to test, given a list of protocols
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def CommandLine (plist):
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linelist = " ".join(plist)
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return "cat " + IncludeProtocols + " " + linelist + " | " + CommandPrefix
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# PrintProtStatus
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#
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# pretty-print the status of a protocol
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def PrintProtStatus (file, prname):
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file.write (prname + ": ")
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if ProtocolToStatusMap[prname] == 0:
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file.write ("All-Flawed")
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elif ProtocolToStatusMap[prname] == 1:
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file.write ("All-Correct")
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else:
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file.write ("Mixed")
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# ScytherEval
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#
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# Take the list of protocols in plist, and give them to Scyther.
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# Returns a dictionary of claim -> bool; where 1 means that it is
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# correct, and 0 means that it is false (i.e. there exists an attack)
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def ScytherEval (plist):
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global options
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# Flush before trying (possibly fatal) external commands
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sys.stdout.flush()
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sys.stderr.flush()
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args = scythertest.default_arguments(plist, options.match, options.bounds)
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n = len(plist)
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if not (n,args) in ArgumentsList:
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ArgumentsList.append((n,args))
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print "Testing",n,"tuples using",args
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return scythertest.default_parsed(plist, options.match, options.bounds)
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# ScytherEval1
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#
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# The above, but do the preprocessing for a single protocol
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def ScytherEval1 (protocol):
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results = ScytherEval ([protocol])
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# Add the claim to the list of ClaimToResultMap
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for claim in results.keys():
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if ClaimToResultMap.has_key(claim):
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# Claim occurs in two protocols; determine the
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# files
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file1 = ProtocolToFileMap[claim.split()[0]]
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file2 = protocol
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raise IOError, 'Claim occurs in two protocols: ' + claim + ", in files (" + file1 + ") and (" + file2 + ")"
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# Add the filename to the protocol mappings
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prname = claim.split()[0]
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if ProtocolToFileMap.has_key(prname):
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# We already wrote this down
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#
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# TODO The mapping should not conflict, but we don't
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# check that now (covered by claim duplication # in a sense)
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#
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# Compare previous result, maybe mixed
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if ProtocolToStatusMap[prname] <> results[claim]:
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ProtocolToStatusMap[prname] = 2
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else:
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# New one, store the first result
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ProtocolToFileMap[prname] = protocol
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ProtocolToStatusMap[prname] = results[claim]
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ClaimToResultMap.update (results)
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# Show progress of i (0..n)
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#
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LastProgress = {}
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ProgressBarWidth = 50
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def ShowProgress (i,n,txt):
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global options
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def IntegerPart (x):
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return int (( x * i ) / n)
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if not options.progressbar:
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return
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percentage = IntegerPart (100)
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factor = IntegerPart (ProgressBarWidth)
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showme = False
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if LastProgress.has_key(n):
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if LastProgress[n]<>(factor,txt):
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showme = True
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else:
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showme = True
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if showme:
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bar = "\r["
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i = 0
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while i < ProgressBarWidth:
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if i <= factor:
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bar = bar + "*"
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else:
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bar = bar + "."
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i = i+1
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bar = bar + "] %3d%% " % percentage + txt
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sys.stderr.write(bar)
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sys.stderr.flush()
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LastProgress[n] = (factor, txt)
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def ClearProgress (n,txt):
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global options
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if not options.progressbar:
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return
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bar = " " * (1 + ProgressBarWidth + 2 + 5 + len(txt))
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sys.stderr.write("\r" + bar + "\r")
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sys.stderr.flush()
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def DescribeContextBrief (filep, protocols, claim, prefix):
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filep.write (prefix)
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prlist = []
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for prfile in protocols:
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prnames = GetKeys (ProtocolToFileMap, prfile)
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prlist = prlist + prnames
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filep.write ("\t" + claim)
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newprname = claim.split()[0]
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prlistclean = []
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prliststr = ""
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for pn in prlist:
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if pn not in prlistclean:
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if pn != newprname:
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prlistclean.append(pn)
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prliststr = prliststr + "\t" + pn
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filep.write (prliststr)
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filep.write ("\n")
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def DescribeContext (filep, protocols, claim):
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def DC_Claim(cl,v):
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if v == 0:
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filep.write ("- " + cl + " : false in both cases")
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elif v == 1:
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filep.write ("+ " + cl + " : correct in both cases")
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elif v == 2:
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filep.write ("* " + cl + " : newly false in multi-protocol test")
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else:
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filep.write ("???")
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filep.write ("\n")
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filep.write ("-- Attack description.\n\n")
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filep.write ("Involving the protocols:\n")
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for prfile in protocols:
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prnames = GetKeys (ProtocolToFileMap, prfile)
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filep.write ("- " + prfile + ": " + ",".join(prnames) + "\n")
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newprname = claim.split()[0]
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newprfile = ProtocolToFileMap[newprname]
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filep.write ("The new attack occurs in " + newprfile + ": " + newprname)
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filep.write ("\n\n")
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filep.write (" $ " + CommandLine (protocols) + "\n")
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filep.write ("\n")
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DC_Claim (claim, 2)
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# Determine, for each protocol name within the list of files,
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# which claims fall under it, and show their previous status
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for prname in ProtocolToFileMap:
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# Protocol name
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if ProtocolToFileMap[prname] in protocols:
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# prname is a protocol name within the scope
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# first print isolation correct files (skipping
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# the claim one, because that is obvious)
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# construct list of claims for this protocol
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cllist = []
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for cl in ClaimToResultMap.keys():
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if cl.split()[0] == prname:
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cllist.append( (cl,ClaimToResultMap[cl]) )
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# We want to show some details, in any case of
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# the protocol of the claim. However, if the
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# partner protocol is completely correct or
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# completely false, we summarize.
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summary = False
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all = 0
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if claim.split()[0] <> prname:
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count = [0,0]
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for cl,v in cllist:
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count[v] = count[v]+1
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if count[0] == 0 and count[1] > 0:
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all = 1
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summary = True
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if count[1] == 0 and count[0] > 0:
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all = 0
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summary = True
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if summary:
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DC_Claim (cl.split()[0] + " *ALL*", all)
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else:
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for cl,v in cllist:
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if v == 1 and cl <> claim:
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DC_Claim(cl,1)
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for cl,v in cllist:
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if v == 0 and cl <> claim:
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DC_Claim(cl,0)
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filep.write ("\n")
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#
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# Determine whether the attack is really only for this combination of protocols (and not with less)
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#
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# returns 0 if it could be done with less also
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# returns 1 if it really requires these protocols
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#
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def RequiresAllProtocols (protocols, claim):
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# check for single results
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if ClaimToResultMap[claim] == 0:
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# claim was always false
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return 0
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# check for simple cases
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if TupleWidth <= 2:
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# nothing to remove
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return 1
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# test the claims when removing some others
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# for TupleWidth size list, we can remove TupleWidth-1
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# protocols, and test
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clprname = claim.split()[0]
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claimfile = ProtocolToFileMap[clprname]
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for redundantfile in protocols:
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if redundantfile != claimfile:
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# for this particular option, construct a list
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simplercase = copy.copy(protocols)
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simplercase.remove(redundantfile)
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# now test the validity of the claim
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simplerresults = ScytherEval (simplercase)
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if simplerresults[claim] == 0:
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# Redundant protocol was not necessary for attack!
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return 0
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return 1
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#
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# Signal that there is an attack, claim X using protocols Y
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#
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# Returns number of new attacks found
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#
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def SignalAttack (protocols, claim):
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if RequiresAllProtocols (protocols, claim) == 0:
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return 0
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ClearProgress (TupleCount, safetxt)
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outs = "***\t" + str(newattacks)
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outs = outs + "\t" + str(processed) + "/" + str(TupleCount)
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for helper in GetListKeys (ProtocolToFileMap, protocols):
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clprname = claim.split()[0]
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if helper <> clprname:
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if helper not in ProtocolToEffectsMap.keys():
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# new
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ProtocolToEffectsMap[helper] = [clprname]
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else:
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# already noted as helper, add destruction now
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if clprname not in ProtocolToEffectsMap[helper]:
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ProtocolToEffectsMap[helper].append(clprname)
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#
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# TODO
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#
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# Generate output to recreate/draw the
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# attack, and maybe add this to a big
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# error log thingy. Furthermore,
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# explicitly recreate the commandline
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# and the claim that is newly violated
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DescribeContextBrief (sys.stdout, protocols, claim, outs)
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return 1
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# ***********************
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# MAIN CODE
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# ***********************
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# Pass std input to temporary file (list of protocol files)
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#----------------------------------------------------------------------
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#
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# Determines:
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# ProtocolCount
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# ProtocolFileList[0..count-1]
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#
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# Furthermore, TempFileList is created.
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def main():
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global options
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global processed, newattacks, StartSkip
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global TupleWidth, TupleCount
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parser = OptionParser()
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scythertest.default_options(parser)
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parser.add_option("-t","--tuplewidth", dest="tuplewidth",
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default = 2,
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help = "number of concurrent protocols to test, >=2")
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parser.add_option("-p","--protocols", dest="protocols",
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default = 0,
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help = "protocol selection (0: all, 1:literature only)")
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parser.add_option("-s","--start", dest="startpercentage",
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default = 0,
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help = "start test at a certain percentage")
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parser.add_option("-B","--disable-progressbar", dest="progressbar",
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default = "True",
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action = "store_false",
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help = "suppress a progress bar")
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(options, args) = parser.parse_args()
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# Where should we start (if this is a number)
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StartPercentage = int (options.startpercentage)
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if StartPercentage < 0 or StartPercentage > 100:
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print "Illegal range for starting percentage (0-100):", StartPercentage
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sys.exit()
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# Send protocollist to temp file (is this necessary?)
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ProtocolFileList = protocollist.select(options.protocols)
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ProtocolCount = len(ProtocolFileList)
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# Determine arguments
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TupleWidth = int(options.tuplewidth)
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# Match
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ScytherMethods = "--match=" + str(options.match)
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# Method of bounding will be determined in ScytherEval
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# Caching of single-protocol results for speed gain.
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#----------------------------------------------------------------------
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#
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# The script first computes the singular results for all the protocols
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# and stores this in an array, or something like that.
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TupleCount = tuplesdo.tuples_count(ProtocolCount, TupleWidth)
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print "Evaluating", TupleCount, "tuples of", TupleWidth, "for", ProtocolCount, "protocols."
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i = 0
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while i < ProtocolCount:
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ShowProgress (i, ProtocolCount,ProtocolFileList[i]+safetxt)
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ScytherEval1 ( ProtocolFileList[i] )
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i = i + 1
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ClearProgress(ProtocolCount, safetxt)
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print "Evaluated single results."
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# Show classification
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#----------------------------------------------------------------------
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#
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print "Correct protocols: ", GetKeys (ProtocolToStatusMap, 1)
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print "Partly flawed protocols: ", GetKeys (ProtocolToStatusMap, 2)
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print "Completely flawed protocols: ", GetKeys (ProtocolToStatusMap, 0)
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# Testing of protocol tuples
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#----------------------------------------------------------------------
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#
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# We take the list of tuples and test each combination.
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processed = 0
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newattacks = 0
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StartSkip = 0
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# Possibly skip some
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if StartPercentage > 0:
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StartSkip = int ((TupleCount * StartPercentage) / 100)
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print "Resuming. Skipping the first", StartSkip,"tuples."
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#
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# Check all these protocols
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#
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def process(protocols):
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global processed, newattacks, StartSkip
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if (processed >= StartSkip):
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#
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# Get the next tuple
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#
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ShowProgress (processed, TupleCount, " ".join(protocols) + safetxt)
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#
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# Determine whether there are valid claims at all in
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# this set of file names
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#
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has_valid_claims = False
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for prname in GetListKeys (ProtocolToFileMap, protocols):
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if ProtocolToStatusMap[prname] != 0:
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has_valid_claims = True
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if has_valid_claims:
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#
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# Use Scyther to verify the claims
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#
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results = ScytherEval ( protocols )
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#
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# Now we have the results for this combination.
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# Check whether any of these claims is 'newly false'
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#
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for claim,value in results.items():
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if value == 0:
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# Apparently this claim is false now (there is
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# an attack)
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newattacks = newattacks + SignalAttack (protocols, claim)
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# Next!
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processed = processed + 1
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tuplesdo.tuples_do(process,ProtocolFileList,TupleWidth)
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ClearProgress (TupleCount, safetxt)
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print "Processed", processed,"tuple combinations in total."
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if StartSkip > 0:
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print "In this session, checked the last",(processed - StartSkip),"tuples. "
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print "Found", newattacks, "new attacks."
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if newattacks > 0:
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print " These were helped by:"
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for helper in ProtocolToEffectsMap.keys():
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sys.stdout.write (" ")
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PrintProtStatus (sys.stdout, helper)
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sys.stdout.write (". This possibly breaks " + str(ProtocolToEffectsMap[helper]) + "\n")
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sys.stdout.flush()
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sys.stderr.flush()
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if __name__ == '__main__':
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main()
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