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When unknown algorithms are encountered, ask the user to report them.

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This commit is contained in:
Joe Testa 2019-08-18 15:20:16 -04:00
parent afa73d2dd2
commit ed11fc135b
1 changed files with 15 additions and 10 deletions
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25
ssh-audit.py
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@ -2498,18 +2498,18 @@ class KexGroupExchange_SHA256(KexGroupExchange):
super(KexGroupExchange_SHA256, self).__init__('KexGroupExchange_SHA256', 'sha256') super(KexGroupExchange_SHA256, self).__init__('KexGroupExchange_SHA256', 'sha256')
def output_algorithms(title, alg_db, alg_type, algorithms, maxlen=0, alg_sizes=None): def output_algorithms(title, alg_db, alg_type, algorithms, unknown_algs, maxlen=0, alg_sizes=None):
# type: (str, Dict[str, Dict[str, List[List[Optional[str]]]]], str, List[text_type], int) -> None # type: (str, Dict[str, Dict[str, List[List[Optional[str]]]]], str, List[text_type], int) -> None
with OutputBuffer() as obuf: with OutputBuffer() as obuf:
for algorithm in algorithms: for algorithm in algorithms:
output_algorithm(alg_db, alg_type, algorithm, maxlen, alg_sizes) output_algorithm(alg_db, alg_type, algorithm, unknown_algs, maxlen, alg_sizes)
if len(obuf) > 0: if len(obuf) > 0:
out.head('# ' + title) out.head('# ' + title)
obuf.flush() obuf.flush()
out.sep() out.sep()
def output_algorithm(alg_db, alg_type, alg_name, alg_max_len=0, alg_sizes=None): def output_algorithm(alg_db, alg_type, alg_name, unknown_algs, alg_max_len=0, alg_sizes=None):
# type: (Dict[str, Dict[str, List[List[Optional[str]]]]], str, text_type, int) -> None # type: (Dict[str, Dict[str, List[List[Optional[str]]]]], str, text_type, int) -> None
prefix = '(' + alg_type + ') ' prefix = '(' + alg_type + ') '
if alg_max_len == 0: if alg_max_len == 0:
@ -2551,6 +2551,7 @@ def output_algorithm(alg_db, alg_type, alg_name, alg_max_len=0, alg_sizes=None):
texts.append(('info', '')) texts.append(('info', ''))
else: else:
texts.append(('warn', 'unknown algorithm')) texts.append(('warn', 'unknown algorithm'))
unknown_algs.append(alg_name)
alg_name = alg_name_with_size if alg_name_with_size is not None else alg_name alg_name = alg_name_with_size if alg_name_with_size is not None else alg_name
first = True first = True
@ -2730,29 +2731,33 @@ def output(banner, header, kex=None, pkm=None):
out.sep() out.sep()
maxlen = algs.maxlen + 1 maxlen = algs.maxlen + 1
output_security(banner, maxlen) output_security(banner, maxlen)
unknown_algorithms = [] # Filled in by output_algorithms() with unidentified algs.
if pkm is not None: if pkm is not None:
adb = SSH1.KexDB.ALGORITHMS adb = SSH1.KexDB.ALGORITHMS
ciphers = pkm.supported_ciphers ciphers = pkm.supported_ciphers
auths = pkm.supported_authentications auths = pkm.supported_authentications
title, atype = 'SSH1 host-key algorithms', 'key' title, atype = 'SSH1 host-key algorithms', 'key'
output_algorithms(title, adb, atype, ['ssh-rsa1'], maxlen) output_algorithms(title, adb, atype, ['ssh-rsa1'], unknown_algorithms, maxlen)
title, atype = 'SSH1 encryption algorithms (ciphers)', 'enc' title, atype = 'SSH1 encryption algorithms (ciphers)', 'enc'
output_algorithms(title, adb, atype, ciphers, maxlen) output_algorithms(title, adb, atype, ciphers, unknown_algorithms, maxlen)
title, atype = 'SSH1 authentication types', 'aut' title, atype = 'SSH1 authentication types', 'aut'
output_algorithms(title, adb, atype, auths, maxlen) output_algorithms(title, adb, atype, auths, unknown_algorithms, maxlen)
if kex is not None: if kex is not None:
adb = SSH2.KexDB.ALGORITHMS adb = SSH2.KexDB.ALGORITHMS
title, atype = 'key exchange algorithms', 'kex' title, atype = 'key exchange algorithms', 'kex'
output_algorithms(title, adb, atype, kex.kex_algorithms, maxlen, kex.dh_modulus_sizes()) output_algorithms(title, adb, atype, kex.kex_algorithms, unknown_algorithms, maxlen, kex.dh_modulus_sizes())
title, atype = 'host-key algorithms', 'key' title, atype = 'host-key algorithms', 'key'
output_algorithms(title, adb, atype, kex.key_algorithms, maxlen, kex.rsa_key_sizes()) output_algorithms(title, adb, atype, kex.key_algorithms, unknown_algorithms, maxlen, kex.rsa_key_sizes())
title, atype = 'encryption algorithms (ciphers)', 'enc' title, atype = 'encryption algorithms (ciphers)', 'enc'
output_algorithms(title, adb, atype, kex.server.encryption, maxlen) output_algorithms(title, adb, atype, kex.server.encryption, unknown_algorithms, maxlen)
title, atype = 'message authentication code algorithms', 'mac' title, atype = 'message authentication code algorithms', 'mac'
output_algorithms(title, adb, atype, kex.server.mac, maxlen) output_algorithms(title, adb, atype, kex.server.mac, unknown_algorithms, maxlen)
output_recommendations(algs, software, maxlen) output_recommendations(algs, software, maxlen)
output_fingerprint(algs, True, maxlen) output_fingerprint(algs, True, maxlen)
# If we encountered any unknown algorithms, ask the user to report them.
if len(unknown_algorithms) > 0:
out.warn("\n\n!!! WARNING: unknown algorithm(s) found!: %s. Please email the full output above to the maintainer (jtesta@positronsecurity.com), or create a Github issue at <https://github.com/jtesta/ssh-audit/issues>.\n" % ','.join(unknown_algorithms))
class Utils(object): class Utils(object):
@classmethod @classmethod