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|
defmodule Chessh.SSH.Daemon do
alias Chessh.Auth.PasswordAuthenticator
use GenServer
def start_link(_) do
GenServer.start_link(__MODULE__, %{
pid: nil
})
end
def init(state) do
GenServer.cast(self(), :start)
{:ok, state}
end
def pwd_authenticate(username, password) do
# TODO - check concurrent sessions
PasswordAuthenticator.authenticate(
String.Chars.to_string(username),
String.Chars.to_string(password)
)
end
def pwd_authenticate(username, password, inet) do
[jail_timeout_ms, jail_threshold] =
Application.get_env(:chessh, RateLimits)
|> Keyword.take([:jail_timeout_ms, :jail_threshold])
|> Keyword.values()
{ip, _port} = inet
rateId = "failed_password_attempts:#{Enum.join(Tuple.to_list(ip), ".")}"
case Hammer.check_rate(rateId, jail_timeout_ms, jail_threshold) do
{:allow, _count} ->
pwd_authenticate(username, password) ||
(fn ->
Hammer.check_rate_inc(rateId, jail_timeout_ms, jail_threshold, 1)
false
end).()
{:deny, _limit} ->
:disconnect
end
end
def pwd_authenticate(username, password, inet, _address),
do: pwd_authenticate(username, password, inet)
def handle_cast(:start, state) do
port = Application.fetch_env!(:chessh, :port)
key_dir = String.to_charlist(Application.fetch_env!(:chessh, :key_dir))
max_sessions = Application.fetch_env!(:chessh, :max_sessions)
case :ssh.daemon(
port,
system_dir: key_dir,
pwdfun: &pwd_authenticate/4,
key_cb: Chessh.SSH.ServerKey,
# disconnectfun:
id_string: :random,
subsystems: [],
parallel_login: true,
max_sessions: max_sessions
) do
{:ok, pid} ->
Process.link(pid)
{:noreply, %{state | pid: pid}, :hibernate}
{:error, err} ->
raise inspect(err)
end
{:noreply, state}
end
def handle_info(_, state), do: {:noreply, state}
end
|
