mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-27 22:03:31 +01:00
116 lines
3.1 KiB
Python
Executable File
116 lines
3.1 KiB
Python
Executable File
#!/usr/bin/python
|
|
# Copyright 2014-2015, The Tor Project, Inc
|
|
# See LICENSE for licensing information
|
|
|
|
# This script parses openssl headers to find ciphersuite names, determines
|
|
# which ones we should be willing to use as a server, and sorts them according
|
|
# to preference rules.
|
|
#
|
|
# Run it on all the files in your openssl include directory.
|
|
|
|
import re
|
|
import sys
|
|
|
|
EPHEMERAL_INDICATORS = [ "_EDH_", "_DHE_", "_ECDHE_" ]
|
|
BAD_STUFF = [ "_DES_40_", "MD5", "_RC4_", "_DES_64_",
|
|
"_SEED_", "_CAMELLIA_", "_NULL" ]
|
|
|
|
# these never get #ifdeffed.
|
|
MANDATORY = [
|
|
"TLS1_TXT_DHE_RSA_WITH_AES_256_SHA",
|
|
"TLS1_TXT_DHE_RSA_WITH_AES_128_SHA",
|
|
"SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA",
|
|
]
|
|
|
|
def find_ciphers(filename):
|
|
with open(filename) as f:
|
|
for line in f:
|
|
m = re.search(r'(?:SSL3|TLS1)_TXT_\w+', line)
|
|
if m:
|
|
yield m.group(0)
|
|
|
|
def usable_cipher(ciph):
|
|
ephemeral = False
|
|
for e in EPHEMERAL_INDICATORS:
|
|
if e in ciph:
|
|
ephemeral = True
|
|
if not ephemeral:
|
|
return False
|
|
|
|
if "_RSA_" not in ciph:
|
|
return False
|
|
|
|
for b in BAD_STUFF:
|
|
if b in ciph:
|
|
return False
|
|
return True
|
|
|
|
# All fields we sort on, in order of priority.
|
|
FIELDS = [ 'cipher', 'fwsec', 'mode', 'digest', 'bitlength' ]
|
|
# Map from sorted fields to recognized value in descending order of goodness
|
|
FIELD_VALS = { 'cipher' : [ 'AES', 'DES'],
|
|
'fwsec' : [ 'ECDHE', 'DHE' ],
|
|
'mode' : [ 'GCM', 'CBC' ],
|
|
'digest' : [ 'SHA384', 'SHA256', 'SHA' ],
|
|
'bitlength' : [ '256', '128', '192' ],
|
|
}
|
|
|
|
class Ciphersuite(object):
|
|
def __init__(self, name, fwsec, cipher, bitlength, mode, digest):
|
|
self.name = name
|
|
self.fwsec = fwsec
|
|
self.cipher = cipher
|
|
self.bitlength = bitlength
|
|
self.mode = mode
|
|
self.digest = digest
|
|
|
|
for f in FIELDS:
|
|
assert(getattr(self, f) in FIELD_VALS[f])
|
|
|
|
def sort_key(self):
|
|
return tuple(FIELD_VALS[f].index(getattr(self,f)) for f in FIELDS)
|
|
|
|
|
|
def parse_cipher(ciph):
|
|
m = re.match('(?:TLS1|SSL3)_TXT_(EDH|DHE|ECDHE)_RSA(?:_WITH)?_(AES|DES)_(256|128|192)(|_CBC|_CBC3|_GCM)_(SHA|SHA256|SHA384)$', ciph)
|
|
|
|
if not m:
|
|
print "/* Couldn't parse %s ! */"%ciph
|
|
return None
|
|
|
|
fwsec, cipher, bits, mode, digest = m.groups()
|
|
if fwsec == 'EDH':
|
|
fwsec = 'DHE'
|
|
|
|
if mode in [ '_CBC3', '_CBC', '' ]:
|
|
mode = 'CBC'
|
|
elif mode == '_GCM':
|
|
mode = 'GCM'
|
|
|
|
return Ciphersuite(ciph, fwsec, cipher, bits, mode, digest)
|
|
|
|
ALL_CIPHERS = []
|
|
|
|
for fname in sys.argv[1:]:
|
|
ALL_CIPHERS += (parse_cipher(c)
|
|
for c in find_ciphers(fname)
|
|
if usable_cipher(c) )
|
|
|
|
ALL_CIPHERS.sort(key=Ciphersuite.sort_key)
|
|
|
|
for c in ALL_CIPHERS:
|
|
if c is ALL_CIPHERS[-1]:
|
|
colon = ';'
|
|
else:
|
|
colon = ' ":"'
|
|
|
|
if c.name in MANDATORY:
|
|
print " /* Required */"
|
|
print ' %s%s'%(c.name,colon)
|
|
else:
|
|
print "#ifdef %s"%c.name
|
|
print ' %s%s'%(c.name,colon)
|
|
print "#endif"
|
|
|
|
|