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Implement compatibility checker (based on returned algorithms).

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This commit is contained in:
Andris Raugulis 2016-08-11 19:40:10 +03:00
parent 4ba3485664
commit 6df21a9891
1 changed files with 36 additions and 6 deletions
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42
ssh-audit.py
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@ -283,16 +283,43 @@ class KexGroup14(KexDH):
'15728e5a8aacaa68ffffffffffffffff', 16)
super(KexGroup14, self).__init__('sha1', 2, p)
def get_ssh_version(version_desc):
if version_desc.startswith('d'):
return ('Dropbear SSH', version_desc[1:])
else:
return ('OpenSSH', version_desc)
def get_ssh_ver(versions):
def get_alg_since_text(versions):
tv = []
for v in versions.split(','):
if v.startswith('d'):
tv.append('Dropbear SSH {0}'.format(v[1:]))
else:
tv.append('OpenSSH {0}'.format(v))
ssh_prefix, ssh_version = get_ssh_version(v)
tv.append('{0} {1}'.format(ssh_prefix, ssh_version))
return 'available since ' + ', '.join(tv).rstrip(', ')
def get_alg_timeframe(alg_desc, result = {}):
vsince = alg_desc[0]
for v in vsince.split(','):
ssh_prefix, ssh_version = get_ssh_version(v)
if not ssh_prefix in result:
result[ssh_prefix] = [None, None]
if result[ssh_prefix][0] is None or result[ssh_prefix][0] < ssh_version:
result[ssh_prefix][0] = ssh_version
return result
def get_ssh_timeframe(kex):
alg_timeframe = {}
algs = {'kex': kex.kex_algorithms,
'key': kex.key_algorithms,
'enc': kex.server.encryption,
'mac': kex.server.mac}
for alg_type, alg_list in algs.items():
for alg_name in alg_list:
alg_desc = KEX_DB[alg_type].get(alg_name)
if alg_desc is None:
continue
alg_timeframe = get_alg_timeframe(alg_desc, alg_timeframe)
return alg_timeframe
WARN_OPENSSH72_LEGACY = 'disabled (in client) since OpenSSH 7.2, legacy algorithm'
FAIL_OPENSSH70_LEGACY = 'removed since OpenSSH 7.0, legacy algorithm'
FAIL_OPENSSH70_WEAK = 'removed (in server) and disabled (in client) since OpenSSH 7.0, weak algorithm'
@ -418,7 +445,7 @@ def output_algorithm(alg_type, alg_name, alg_max_len=0):
ldesc = len(alg_desc)
for idx, level in enumerate(['fail', 'warn', 'info']):
if level == 'info':
texts.append((level, get_ssh_ver(alg_desc[0])))
texts.append((level, get_alg_since_text(alg_desc[0])))
idx = idx + 1
if ldesc > idx:
for t in alg_desc[idx]:
@ -449,6 +476,9 @@ def output(banner, kex):
out.fail('[fail] protocol SSH1 enabled')
if kex is None:
return
alg_timeframe = get_ssh_timeframe(kex)
guess_text = ', '.join('{} {}'.format(k, ' - '.join([v[0] or '...', v[1] or '...'])) for k, v in alg_timeframe.items())
out.good('[info] compatibility: ' + guess_text)
compressions = [x for x in kex.server.compression if x != 'none']
if len(compressions) > 0:
cmptxt = 'enabled ({0})'.format(', '.join(compressions))