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#!/usr/bin/env python3
#
# Copyright 2017-2023 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
import json
import sys
import glob
import vyos.opmode
from vyos.utils.process import cmd
from vyos.configquery import ConfigTreeQuery
from tabulate import tabulate
def show_fingerprints(raw: bool, ascii: bool):
config = ConfigTreeQuery()
if not config.exists("service ssh"):
raise vyos.opmode.UnconfiguredSubsystem("SSH server is not enabled.")
publickeys = glob.glob("/etc/ssh/*.pub")
if publickeys:
keys = []
for keyfile in publickeys:
try:
if ascii:
keydata = cmd("ssh-keygen -l -v -E sha256 -f " + keyfile).splitlines()
else:
keydata = cmd("ssh-keygen -l -E sha256 -f " + keyfile).splitlines()
type = keydata[0].split(None)[-1].strip("()")
key_size = keydata[0].split(None)[0]
fingerprint = keydata[0].split(None)[1]
comment = keydata[0].split(None)[2:-1][0]
if ascii:
ascii_art = "\n".join(keydata[1:])
keys.append({"type": type, "key_size": key_size, "fingerprint": fingerprint, "comment": comment, "ascii_art": ascii_art})
else:
keys.append({"type": type, "key_size": key_size, "fingerprint": fingerprint, "comment": comment})
except:
# Ignore invalid public keys
pass
if raw:
return keys
else:
headers = {"type": "Type", "key_size": "Key Size", "fingerprint": "Fingerprint", "comment": "Comment", "ascii_art": "ASCII Art"}
output = "SSH server public key fingerprints:\n\n" + tabulate(keys, headers=headers, tablefmt="simple")
return output
else:
if raw:
return []
else:
return "No SSH server public keys are found."
def show_dynamic_protection(raw: bool):
config = ConfigTreeQuery()
if not config.exists(['service', 'ssh', 'dynamic-protection']):
raise vyos.opmode.UnconfiguredObject("SSH server dynamic-protection is not enabled.")
attackers = []
try:
# IPv4
attackers = attackers + json.loads(cmd("nft -j list set ip sshguard attackers"))["nftables"][1]["set"]["elem"]
except:
pass
try:
# IPv6
attackers = attackers + json.loads(cmd("nft -j list set ip6 sshguard attackers"))["nftables"][1]["set"]["elem"]
except:
pass
if attackers:
if raw:
return attackers
else:
output = "Blocked attackers:\n" + "\n".join(attackers)
return output
else:
if raw:
return []
else:
return "No blocked attackers."
if __name__ == '__main__':
try:
res = vyos.opmode.run(sys.modules[__name__])
if res:
print(res)
except (ValueError, vyos.opmode.Error) as e:
print(e)
sys.exit(1)
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