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@@ -0,0 +1,115 @@
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+#!/usr/bin/python
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+# Copyright 2014, The Tor Project, Inc
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+# See LICENSE for licensing information
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+
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+# This script parses openssl headers to find ciphersuite names, determines
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+# which ones we should be willing to use as a server, and sorts them according
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+# to preference rules.
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+#
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+# Run it on all the files in your openssl include directory.
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+
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+import re
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+import sys
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+
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+EPHEMERAL_INDICATORS = [ "_EDH_", "_DHE_", "_ECDHE_" ]
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+BAD_STUFF = [ "_DES_40_", "MD5", "_RC4_", "_DES_64_",
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+ "_SEED_", "_CAMELLIA_", "_NULL" ]
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+
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+# these never get #ifdeffed.
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+MANDATORY = [
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+ "TLS1_TXT_DHE_RSA_WITH_AES_256_SHA",
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+ "TLS1_TXT_DHE_RSA_WITH_AES_128_SHA",
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+ "SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA",
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+]
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+
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+def find_ciphers(filename):
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+ with open(filename) as f:
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+ for line in f:
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+ m = re.search(r'(?:SSL3|TLS1)_TXT_\w+', line)
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+ if m:
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+ yield m.group(0)
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+
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+def usable_cipher(ciph):
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+ ephemeral = False
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+ for e in EPHEMERAL_INDICATORS:
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+ if e in ciph:
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+ ephemeral = True
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+ if not ephemeral:
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+ return False
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+
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+ if "_RSA_" not in ciph:
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+ return False
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+
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+ for b in BAD_STUFF:
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+ if b in ciph:
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+ return False
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+ return True
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+
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+# All fields we sort on, in order of priority.
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+FIELDS = [ 'cipher', 'fwsec', 'mode', 'digest', 'bitlength' ]
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+# Map from sorted fields to recognized value in descending order of goodness
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+FIELD_VALS = { 'cipher' : [ 'AES', 'DES'],
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+ 'fwsec' : [ 'ECDHE', 'DHE' ],
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+ 'mode' : [ 'GCM', 'CBC' ],
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+ 'digest' : [ 'SHA384', 'SHA256', 'SHA' ],
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+ 'bitlength' : [ '256', '128', '192' ],
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+}
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+
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+class Ciphersuite(object):
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+ def __init__(self, name, fwsec, cipher, bitlength, mode, digest):
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+ self.name = name
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+ self.fwsec = fwsec
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+ self.cipher = cipher
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+ self.bitlength = bitlength
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+ self.mode = mode
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+ self.digest = digest
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+
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+ for f in FIELDS:
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+ assert(getattr(self, f) in FIELD_VALS[f])
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+
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+ def sort_key(self):
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+ return tuple(FIELD_VALS[f].index(getattr(self,f)) for f in FIELDS)
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+
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+
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+def parse_cipher(ciph):
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+ m = re.match('(?:TLS1|SSL3)_TXT_(EDH|DHE|ECDHE)_RSA(?:_WITH)?_(AES|DES)_(256|128|192)(|_CBC|_CBC3|_GCM)_(SHA|SHA256|SHA384)$', ciph)
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+
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+ if not m:
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+ print "/* Couldn't parse %s ! */"%ciph
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+ return None
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+
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+ fwsec, cipher, bits, mode, digest = m.groups()
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+ if fwsec == 'EDH':
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+ fwsec = 'DHE'
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+
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+ if mode in [ '_CBC3', '_CBC', '' ]:
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+ mode = 'CBC'
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+ elif mode == '_GCM':
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+ mode = 'GCM'
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+
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+ return Ciphersuite(ciph, fwsec, cipher, bits, mode, digest)
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+
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+ALL_CIPHERS = []
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+
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+for fname in sys.argv[1:]:
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+ ALL_CIPHERS += (parse_cipher(c)
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+ for c in find_ciphers(fname)
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+ if usable_cipher(c) )
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+
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+ALL_CIPHERS.sort(key=Ciphersuite.sort_key)
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+
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+for c in ALL_CIPHERS:
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+ if c is ALL_CIPHERS[-1]:
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+ colon = ';'
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+ else:
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+ colon = ' ":"'
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+
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+ if c.name in MANDATORY:
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+ print " /* Required */"
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+ print ' %s%s'%(c.name,colon)
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+ else:
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+ print "#ifdef %s"%c.name
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+ print ' %s%s'%(c.name,colon)
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+ print "#endif"
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+
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+
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Nick Mathewson