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diff --git a/lib/pleroma/bbs/authenticator.ex b/lib/pleroma/bbs/authenticator.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.BBS.Authenticator do
+  use Sshd.PasswordAuthenticator
+  alias Pleroma.User
+  alias Pleroma.Web.Plugs.AuthenticationPlug
+
+  def authenticate(username, password) do
+    username = to_string(username)
+    password = to_string(password)
+
+    with %User{} = user <- User.get_by_nickname(username) do
+      AuthenticationPlug.checkpw(password, user.password_hash)
+    else
+      _e -> false
+    end
+  end
+end