438 lines
12 KiB
Python
Executable File
438 lines
12 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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# Input of this script:
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#
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# - A number on the commandline of stuff to test
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# - A list of files on stdin to be used (lines starting with '#' are
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# ignored)
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#
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#
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# Tips and tricks:
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#
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# Use e.g.
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# $ ulimit -v 100000
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# to counteract memory problems
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#
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# If you know where to look, use
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# $ ls s*.spdl t*.spdl -1 | ./multiprotocoltest.py 2
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# To verify combos of protocols starting with s and t
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#
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# ***********************
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# PARAMETERS
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# ***********************
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# Temporary files
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TempFileList = "scyther-blap.tmp"
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TempFileTuples = "scyther-blip.tmp"
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# External programs
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TupleProgram = "./tuples.py"
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ScytherProgram = "../src/scyther"
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# Scyther parameters
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ScytherDefaults = "--summary"
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ScytherMethods = "-m1 -a"
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ScytherBounds = "-r4 --max-depth=20 -l15"
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# Build a large part of the command line (for Scyther) already
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ScytherArgs = ScytherDefaults + " " + ScytherMethods + " " + ScytherBounds
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CommandPrefix = ScytherProgram + " " + ScytherArgs
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# Some default settings for Agents, untrusted e with sk(e) and k(a,e) etc.
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IncludeProtocols = 'spdl-defaults.inc'
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# Some protocols are causing troubles: this is a hard-coded filter to exclude
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# the problem children. Unfair, yes. Practical, yes.
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SkipList = [ 'gong-nonce.spdl', 'gong-nonce-b.spdl', 'splice-as-hc.spdl', 'kaochow-palm.spdl' ]
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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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# ***********************
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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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# ***********************
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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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results = {}
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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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# Use Scyther
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(status,scout) = commands.getstatusoutput(CommandLine (plist))
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if status == 1 or status < 0:
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# Something went wrong
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print "*** Error when checking [" + CommandLine (plist) + "]\n"
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return results
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lines = scout.splitlines()
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for line in lines:
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data = line.split()
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if len(data) > 6 and data[0] == 'claim':
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claim = " ".join(data[1:4])
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tag = data[6]
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value = -1
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if tag == 'failed:':
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value = 0
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if tag == 'correct:':
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value = 1
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if value == -1:
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raise IOError, 'Scyther output for ' + commandline + ', line ' + line + ' cannot be parsed.'
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results[claim] = value
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return results
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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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def IntegerPart (x):
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return int (( x * i ) / n)
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percentage = IntegerPart (100)
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factor = IntegerPart (ProgressBarWidth)
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showme = 0
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if LastProgress.has_key(n):
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if LastProgress[n]<>(factor,txt):
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showme = 1
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else:
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showme = 1
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if showme == 1:
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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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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 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 = 0
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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 = 1
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if count[1] == 0 and count[0] > 0:
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all = 0
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summary = 1
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if summary == 1:
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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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# 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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# TupleWidth
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# ProtocolCount
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# Protocol[0..count-1]
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#
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# Furthermore, TempFileList is created.
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TupleWidth = sys.argv[1]
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# Read stdin into list and count, send to file
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loop = 1
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ProtocolCount = 0
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Protocol = []
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outp = open(TempFileList, 'w')
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while loop:
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line = sys.stdin.readline()
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if line != '':
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# not the end of the input
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cleanline = string.strip(line)
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if cleanline != '' and cleanline[0] != '#' and cleanline not in SkipList:
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# not a blank line, not forbidden
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Protocol.append(cleanline)
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ProtocolCount = ProtocolCount + 1
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outp.write(line)
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else:
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# end of the input
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loop = 0
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outp.close()
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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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print "Evaluating tuples of", TupleWidth, "for", ProtocolCount, "protocols, using the command '" + CommandPrefix + "'"
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i = 0
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safetxt = " " * 20
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while i < ProtocolCount:
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ShowProgress (i, ProtocolCount,Protocol[i]+safetxt)
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ScytherEval1 ( Protocol[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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# Computation of combined list.
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#----------------------------------------------------------------------
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#
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# We use the tuple script to generate the list of tuples we need.
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# We use a temporary file (again) to store that list.
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# This requires that 'tuples.py' is in the same directory.
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lstatus=os.system(TupleProgram + ' ' + TupleWidth + ' <' + TempFileList + ' >' + TempFileTuples)
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inp = open(TempFileTuples, 'r')
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TupleCount = 0
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for x in inp:
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TupleCount = TupleCount + 1
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inp.close()
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print "Commencing test for", TupleCount, "protocol combinations."
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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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inp = open(TempFileTuples, 'r')
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processed = 0
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newattacks = 0
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for tline in inp:
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#
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# Get the next tuple
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#
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protocols = tline.split()
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ShowProgress (processed, TupleCount, " ".join(protocols) + safetxt)
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#
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# Process it
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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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if ClaimToResultMap[claim] == 1:
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# Wooh! It was correct before
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ClearProgress (TupleCount, safetxt)
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newattacks = newattacks + 1
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print "-" * 40
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print "New attack [[", newattacks, "]] at", processed, "/", TupleCount, ":", claim, " using",CommandLine( protocols)
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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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print "% Detected a new flaw helper:", helper
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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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DescribeContext (sys.stdout, protocols, claim)
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# Next!
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processed = processed + 1
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inp.close()
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ClearProgress (TupleCount, safetxt)
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print "Processed", processed,"tuple combinations in total."
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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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