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Recognize LANcom LCOS software and support ed448 key extraction (#277)

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* Include raw hostkey bytes in debug output

* Recognize LANcom LCOS software and support extraction of ssh-ed448 key type

LANcom router devices appear to be primarily used in Germany (see [1]
for examples on the public Internet), and they appear to support the
`ssh-ed448` key type which is documented in [2], but which has never
been supported by any as-yet-released version of OpenSSH.

[1] https://www.shodan.io/search?query=ssh+%22ed448%22
[2] https://datatracker.ietf.org/doc/html/rfc8709#name-public-key-format
This commit is contained in:
Daniel Lenski 2024-07-06 17:56:24 -07:00 committed by GitHub
parent 92db5f0138
commit bbbdf71e50
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GPG Key ID: B5690EEEBB952194
3 changed files with 11 additions and 0 deletions
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4
src/ssh_audit/hostkeytest.py
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@ -52,6 +52,9 @@ class HostKeyTest:
'ssh-ed25519': {'cert': False, 'variable_key_len': False},
'ssh-ed25519-cert-v01@openssh.com': {'cert': True, 'variable_key_len': False},
'ssh-ed448': {'cert': False, 'variable_key_len': False},
# 'ssh-ed448-cert-v01@openssh.com': {'cert': True, 'variable_key_len': False},
}
TWO2K_MODULUS_WARNING = '2048-bit modulus only provides 112-bits of symmetric strength'
@ -158,6 +161,7 @@ class HostKeyTest:
ca_key_type = kex_group.get_ca_type()
ca_modulus_size = kex_group.get_ca_size()
out.d("Hostkey type: [%s]; hostkey size: %u; CA type: [%s]; CA modulus size: %u" % (host_key_type, hostkey_modulus_size, ca_key_type, ca_modulus_size), write_now=True)
out.d("Raw hostkey bytes (%d): [%s]" % (len(raw_hostkey_bytes), raw_hostkey_bytes.hex()), write_now=True)
# Record all the host key info.
server_kex.set_host_key(host_key_type, raw_hostkey_bytes, hostkey_modulus_size, ca_key_type, ca_modulus_size)

3
src/ssh_audit/kexdh.py
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@ -134,6 +134,9 @@ class KexDH: # pragma: nocover
if self.__hostkey_type == 'ssh-ed25519':
self.out.d("%s has a fixed host key modulus of 32." % self.__hostkey_type)
self.__hostkey_n_len = 32
elif self.__hostkey_type == 'ssh-ed448':
self.out.d("%s has a fixed host key modulus of 57." % self.__hostkey_type)
self.__hostkey_n_len = 57
else:
# Here is the modulus size & actual modulus of the host key public key.
hostkey_n, self.__hostkey_n_len, ptr = KexDH.__get_bytes(hostkey, ptr)

4
src/ssh_audit/software.py
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@ -224,4 +224,8 @@ class Software:
mx = re.match(r'^PuTTY_Release_(.*)', software)
if mx:
return cls(None, Product.PuTTY, mx.group(1), None, None)
mx = re.match(r'^lancom(.*)', software)
if mx:
v, p = 'LANcom', 'LCOS sshd'
return cls(v, p, mx.group(1), None, None)
return None