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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
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)