#!/usr/bin/env python2 """ Used to generate lib/tls/tls_suite_info.cpp from IANA params (C) 2011, 2012, 2013, 2014 Jack Lloyd Botan is released under the Simplified BSD License (see license.txt) """ import sys import re import datetime import hashlib import optparse def to_ciphersuite_info(code, name): (sig_and_kex,cipher_and_mac) = name.split('_WITH_') if sig_and_kex == 'RSA': sig_algo = 'RSA' kex_algo = 'RSA' elif 'PSK' in sig_and_kex: sig_algo = '' kex_algo = sig_and_kex elif 'SRP' in sig_and_kex: srp_info = sig_and_kex.split('_') if len(srp_info) == 2: # 'SRP_' + hash kex_algo = sig_and_kex sig_algo = '' else: kex_algo = '_'.join(srp_info[0:-1]) sig_algo = srp_info[-1] else: (kex_algo, sig_algo) = sig_and_kex.split('_') cipher_and_mac = cipher_and_mac.split('_') mac_algo = cipher_and_mac[-1] cipher = cipher_and_mac[:-1] if mac_algo == '8' and cipher[-1] == 'CCM': cipher = cipher[:-1] mac_algo = 'CCM_8' if mac_algo == 'CCM': cipher += ['CCM'] mac_algo = 'SHA256' elif mac_algo == 'CCM_8': cipher += ['CCM(8)'] mac_algo = 'SHA256' cipher_info = { 'RC4': ('RC4',None), 'CHACHA20': ('ChaCha',32), 'IDEA': ('IDEA',16), 'DES': ('DES',8), '3DES': ('3DES',24), 'CAMELLIA': ('Camellia',None), 'AES': ('AES',None), 'SEED': ('SEED',16), 'ARIA': ('ARIA',16), } tls_to_botan_names = { 'anon': '', 'MD5': 'MD5', 'SHA': 'SHA-1', 'SHA256': 'SHA-256', 'SHA384': 'SHA-384', 'SHA512': 'SHA-512', 'RC4': 'RC4', 'CHACHA': 'ChaCha', '3DES': 'TripleDES', 'DSS': 'DSA', 'ECDSA': 'ECDSA', 'RSA': 'RSA', 'SRP_SHA': 'SRP_SHA', 'DHE': 'DH', 'DH': 'DH', 'ECDHE': 'ECDH', 'ECDH': 'ECDH', '': '', 'PSK': 'PSK', 'DHE_PSK': 'DHE_PSK', 'PSK_DHE': 'DHE_PSK', 'ECDHE_PSK': 'ECDHE_PSK', } mac_keylen = { 'MD5': 16, 'SHA-1': 20, 'SHA-256': 32, 'SHA-384': 48, 'SHA-512': 64, } mac_algo = tls_to_botan_names[mac_algo] sig_algo = tls_to_botan_names[sig_algo] kex_algo = tls_to_botan_names[kex_algo] (cipher_algo, cipher_keylen) = cipher_info[cipher[0]] if cipher_keylen is None: cipher_keylen = int(cipher[1]) / 8 if cipher_algo in ['AES', 'Camellia']: cipher_algo += '-%d' % (cipher_keylen*8) modestr = '' mode = '' ivlen = 0 if cipher[0] == 'CHACHA20' and cipher[1] == 'POLY1305': iv_len = 4 if (code[0:2] == 'CC'): iv_len = 0 return 'Ciphersuite(0x%s, "%s", "%s", "%s", %d, %d, %d, "AEAD", %d, "%s")' % ( code, sig_algo, kex_algo, "ChaCha20Poly1305", cipher_keylen, iv_len, 0, 0, mac_algo) stream_ciphers = ['RC4'] if cipher_algo not in stream_ciphers: mode = cipher[-1] if mode not in ['CBC', 'GCM', 'CCM(8)', 'CCM', 'OCB']: print "#warning Unknown mode %s" % (' '.join(cipher)) ivlen = 8 if cipher_algo == '3DES' else 16 if mode != 'CBC': if mode == 'OCB': cipher_algo += '/OCB(12)' else: cipher_algo += '/' + mode if cipher_algo in stream_ciphers or mode == 'CBC': return 'Ciphersuite(0x%s, "%s", "%s", "%s", %d, %d, 0, "%s", %d)' % ( code, sig_algo, kex_algo, cipher_algo, cipher_keylen, ivlen, mac_algo, mac_keylen[mac_algo]) elif mode == 'OCB': return 'Ciphersuite(0x%s, "%s", "%s", "%s", %d, %d, %d, "AEAD", %d, "%s")' % ( code, sig_algo, kex_algo, cipher_algo, cipher_keylen, 4, 0, 0, mac_algo) else: iv_bytes_from_hs = 4 iv_bytes_from_rec = 8 return 'Ciphersuite(0x%s, "%s", "%s", "%s", %d, %d, %d, "AEAD", %d, "%s")' % ( code, sig_algo, kex_algo, cipher_algo, cipher_keylen, iv_bytes_from_hs, iv_bytes_from_rec, 0, mac_algo) def open_input(args): iana_url = 'https://www.iana.org/assignments/tls-parameters/tls-parameters.txt' if len(args) == 1: try: return open('tls-parameters.txt') except: pass import urllib2 return urllib2.urlopen(iana_url) else: return open(args[1]) """ Handle command line options """ def process_command_line(args): parser = optparse.OptionParser() parser.add_option('--with-chacha', action='store_true', default=True, help='enable experimental ChaCha suites') parser.add_option('--without-chacha', action='store_false', dest='with_chacha', help='disable experimental ChaCha suites') parser.add_option('--with-ocb', action='store_true', default=True, help='enable experimental OCB AEAD suites') parser.add_option('--without-ocb', action='store_false', dest='with_ocb', help='disable experimental OCB AEAD suites') parser.add_option('--with-srp-aead', action='store_true', default=False, help='add experimental SRP AEAD suites') parser.add_option('--with-eax', action='store_true', default=False, help='add experimental EAX AEAD suites') parser.add_option('--save-download', action='store_true', default=True, help='save downloaded tls-parameters.txt') parser.add_option('--output', '-o', help='file to write output to (default %default)', default='src/lib/tls/tls_suite_info.cpp') return parser.parse_args(args) def main(args = None): if args is None: args = sys.argv weak_crypto = ['EXPORT', 'RC2', 'IDEA', 'RC4', '_DES_', 'WITH_NULL'] static_dh = ['ECDH_ECDSA', 'ECDH_RSA', 'DH_DSS', 'DH_RSA'] # not supported protocol_goop = ['SCSV', 'KRB5'] maybe_someday = ['ARIA', 'RSA_PSK'] not_supported = weak_crypto + static_dh + protocol_goop + maybe_someday (options, args) = process_command_line(args) ciphersuite_re = re.compile(' +0x([0-9a-fA-F][0-9a-fA-F]),0x([0-9a-fA-F][0-9a-fA-F]) + TLS_([A-Za-z_0-9]+) ') suites = {} suite_codes = {} contents = '' for line in open_input(args): contents += line match = ciphersuite_re.match(line) if match: code = match.group(1) + match.group(2) name = match.group(3) should_use = True for ns in not_supported: if ns in name: should_use = False if should_use: suites[name] = (code, to_ciphersuite_info(code, name)) sha1 = hashlib.sha1() sha1.update(contents) contents_hash = sha1.hexdigest() if options.save_download: out = open('tls-parameters.txt', 'w') out.write(contents) out.close() def define_custom_ciphersuite(name, code): suites[name] = (code, to_ciphersuite_info(code, name)) # From http://tools.ietf.org/html/draft-ietf-tls-56-bit-ciphersuites-01 define_custom_ciphersuite('DHE_DSS_WITH_RC4_128_SHA', '0066') if options.with_chacha: # Google servers - draft-agl-tls-chacha20poly1305-04 define_custom_ciphersuite('ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256', 'CC13') define_custom_ciphersuite('ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256', 'CC14') define_custom_ciphersuite('DHE_RSA_WITH_CHACHA20_POLY1305_SHA256', 'CC15') if options.with_chacha and False: # Provisional IETF ChaCha suites define_custom_ciphersuite('RSA_WITH_CHACHA20_POLY1305_SHA256', 'CD30') define_custom_ciphersuite('ECDSA_RSA_WITH_CHACHA20_POLY1305_SHA256', 'CD31') define_custom_ciphersuite('ECDSA_ECDSA_WITH_CHACHA20_POLY1305_SHA256', 'CD32') define_custom_ciphersuite('DHE_RSA_WITH_CHACHA20_POLY1305_SHA256', 'CD33') define_custom_ciphersuite('DHE_PSK_WITH_CHACHA20_POLY1305_SHA256', 'CD34') define_custom_ciphersuite('PSK_WITH_CHACHA20_POLY1305_SHA256', 'CD35') define_custom_ciphersuite('ECDHE_PSK_WITH_CHACHA20_POLY1305_SHA256', 'CD36') # Expermental things if options.with_ocb: define_custom_ciphersuite('ECDHE_RSA_WITH_AES_128_OCB_SHA256', 'FFF0') define_custom_ciphersuite('ECDHE_RSA_WITH_AES_256_OCB_SHA256', 'FFF1') define_custom_ciphersuite('ECDHE_ECDSA_WITH_AES_128_OCB_SHA256', 'FFF2') define_custom_ciphersuite('ECDHE_ECDSA_WITH_AES_256_OCB_SHA256', 'FFF3') define_custom_ciphersuite('DHE_RSA_WITH_AES_128_OCB_SHA256', 'FFF4') define_custom_ciphersuite('DHE_RSA_WITH_AES_256_OCB_SHA256', 'FFF5') define_custom_ciphersuite('PSK_WITH_AES_128_OCB_SHA256', 'FFF6') define_custom_ciphersuite('PSK_WITH_AES_256_OCB_SHA256', 'FFF7') define_custom_ciphersuite('ECDHE_PSK_WITH_AES_128_OCB_SHA256', 'FFF8') define_custom_ciphersuite('ECDHE_PSK_WITH_AES_256_OCB_SHA256', 'FFF9') define_custom_ciphersuite('DHE_PSK_WITH_AES_128_OCB_SHA256', 'FFFA') define_custom_ciphersuite('DHE_PSK_WITH_AES_256_OCB_SHA256', 'FFFB') if options.with_eax: define_custom_ciphersuite('ECDHE_ECDSA_WITH_AES_128_EAX_SHA256', 'FF90') define_custom_ciphersuite('ECDHE_ECDSA_WITH_AES_256_EAX_SHA384', 'FF91') define_custom_ciphersuite('ECDHE_RSA_WITH_AES_128_EAX_SHA256', 'FF92') define_custom_ciphersuite('ECDHE_RSA_WITH_AES_256_EAX_SHA384', 'FF93') if options.with_srp_aead: define_custom_ciphersuite('SRP_SHA_WITH_AES_256_GCM_SHA384', 'FFA0') define_custom_ciphersuite('SRP_SHA_RSA_WITH_AES_256_GCM_SHA384', 'FFA1') define_custom_ciphersuite('SRP_SHA_DSS_WITH_AES_256_GCM_SHA384', 'FFA2') define_custom_ciphersuite('SRP_SHA_ECDSA_WITH_AES_256_GCM_SHA384', 'FFA3') if options.with_eax: define_custom_ciphersuite('SRP_SHA_WITH_AES_256_EAX_SHA384', 'FFA8') define_custom_ciphersuite('SRP_SHA_RSA_WITH_AES_256_EAX_SHA384', 'FFA9') define_custom_ciphersuite('SRP_SHA_DSS_WITH_AES_256_EAX_SHA384', 'FFAA') define_custom_ciphersuite('SRP_SHA_ECDSA_WITH_AES_256_EAX_SHA384', 'FFAB') suite_info = '' def header(): return """/* * TLS cipher suite information * * This file was automatically generated from the IANA assignments * (tls-parameters.txt hash %s) * by %s on %s * * Botan is released under the Simplified BSD License (see license.txt) */ """ % (contents_hash, sys.argv[0], datetime.date.today().strftime("%Y-%m-%d")) suite_info += header() suite_info += """#include namespace Botan { namespace TLS { Ciphersuite Ciphersuite::by_id(u16bit suite) { switch(suite) { """ for k in sorted(suites.keys()): suite_info += " case 0x%s: // %s\n" % (suites[k][0], k) suite_info += " return %s;\n\n" % (suites[k][1]) suite_info += """ } return Ciphersuite(); // some unknown ciphersuite } } } """ if options.output == '-': print suite_info, else: out = open(options.output, 'w') out.write(suite_info) out.close() if __name__ == '__main__': sys.exit(main())