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diff --git a/lib/pleroma/web/mongoose_im/mongoose_im_controller.ex b/lib/pleroma/web/mongoose_im/mongoose_im_controller.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.MongooseIM.MongooseIMController do
+  use Pleroma.Web, :controller
+
+  alias Pleroma.Repo
+  alias Pleroma.User
+  alias Pleroma.Web.Plugs.AuthenticationPlug
+  alias Pleroma.Web.Plugs.RateLimiter
+
+  plug(RateLimiter, [name: :authentication] when action in [:user_exists, :check_password])
+  plug(RateLimiter, [name: :authentication, params: ["user"]] when action == :check_password)
+
+  def user_exists(conn, %{"user" => username}) do
+    with %User{} <- Repo.get_by(User, nickname: username, local: true, is_active: true) do
+      conn
+      |> json(true)
+    else
+      _ ->
+        conn
+        |> put_status(:not_found)
+        |> json(false)
+    end
+  end
+
+  def check_password(conn, %{"user" => username, "pass" => password}) do
+    with %User{password_hash: password_hash, is_active: true} <-
+           Repo.get_by(User, nickname: username, local: true),
+         true <- AuthenticationPlug.checkpw(password, password_hash) do
+      conn
+      |> json(true)
+    else
+      false ->
+        conn
+        |> put_status(:forbidden)
+        |> json(false)
+
+      _ ->
+        conn
+        |> put_status(:not_found)
+        |> json(false)
+    end
+  end
+end