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# NixOS module for kippo honeypot ssh server
# See all the options for configuration details.
#
# Default port is 2222. Recommend using something like this for port redirection to default SSH port:
# networking.firewall.extraCommands = ''
# iptables -t nat -A PREROUTING -i IN_IFACE -p tcp --dport 22 -j REDIRECT --to-port 2222'';
#
# Lastly: use this service at your own risk. I am working on a way to run this inside a VM.
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.kippo;
in
{
options = {
services.kippo = {
enable = mkOption {
default = false;
type = types.bool;
description = "Enable the kippo honeypot ssh server.";
};
port = mkOption {
default = 2222;
type = types.int;
description = "TCP port number for kippo to bind to.";
};
hostname = mkOption {
default = "nas3";
type = types.str;
description = "Hostname for kippo to present to SSH login";
};
varPath = mkOption {
default = "/var/lib/kippo";
type = types.path;
description = "Path of read/write files needed for operation and configuration.";
};
logPath = mkOption {
default = "/var/log/kippo";
type = types.path;
description = "Path of log files needed for operation and configuration.";
};
pidPath = mkOption {
default = "/run/kippo";
type = types.path;
description = "Path of pid files needed for operation.";
};
extraConfig = mkOption {
default = "";
type = types.lines;
description = "Extra verbatim configuration added to the end of kippo.cfg.";
};
};
};
config = mkIf cfg.enable {
environment.systemPackages = with pkgs.pythonPackages; [
python pkgs.kippo.twisted pycrypto pyasn1 ];
environment.etc."kippo.cfg".text = ''
# Automatically generated by NixOS.
# See ${pkgs.kippo}/src/kippo.cfg for details.
[honeypot]
log_path = ${cfg.logPath}
download_path = ${cfg.logPath}/dl
filesystem_file = ${cfg.varPath}/honeyfs
filesystem_file = ${cfg.varPath}/fs.pickle
data_path = ${cfg.varPath}/data
txtcmds_path = ${cfg.varPath}/txtcmds
public_key = ${cfg.varPath}/keys/public.key
private_key = ${cfg.varPath}/keys/private.key
ssh_port = ${toString cfg.port}
hostname = ${cfg.hostname}
${cfg.extraConfig}
'';
users.users.kippo = {
description = "kippo web server privilege separation user";
uid = 108; # why does config.ids.uids.kippo give an error?
};
users.groups.kippo.gid = 108;
systemd.services.kippo = with pkgs; {
description = "Kippo Web Server";
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
environment.PYTHONPATH = "${pkgs.kippo}/src/:${pkgs.pythonPackages.pycrypto}/lib/python2.7/site-packages/:${pkgs.pythonPackages.pyasn1}/lib/python2.7/site-packages/:${pkgs.pythonPackages.python}/lib/python2.7/site-packages/:${pkgs.kippo.twisted}/lib/python2.7/site-packages/:.";
preStart = ''
if [ ! -d ${cfg.varPath}/ ] ; then
mkdir -p ${cfg.logPath}/tty
mkdir -p ${cfg.logPath}/dl
mkdir -p ${cfg.varPath}/keys
cp ${pkgs.kippo}/src/honeyfs ${cfg.varPath} -r
cp ${pkgs.kippo}/src/fs.pickle ${cfg.varPath}/fs.pickle
cp ${pkgs.kippo}/src/data ${cfg.varPath} -r
cp ${pkgs.kippo}/src/txtcmds ${cfg.varPath} -r
chmod u+rw ${cfg.varPath} -R
chown kippo.kippo ${cfg.varPath} -R
chown kippo.kippo ${cfg.logPath} -R
chmod u+rw ${cfg.logPath} -R
fi
if [ ! -d ${cfg.pidPath}/ ] ; then
mkdir -p ${cfg.pidPath}
chmod u+rw ${cfg.pidPath}
chown kippo.kippo ${cfg.pidPath}
fi
'';
serviceConfig.ExecStart = "${pkgs.kippo.twisted}/bin/twistd -y ${pkgs.kippo}/src/kippo.tac --syslog --rundir=${cfg.varPath}/ --pidfile=${cfg.pidPath}/kippo.pid --prefix=kippo -n";
serviceConfig.PermissionsStartOnly = true;
serviceConfig.User = "kippo";
serviceConfig.Group = "kippo";
};
};
}
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