diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2ed380102..3ff70e6e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [unreleased]
 ### Added
+- [MongooseIM](https://github.com/esl/MongooseIM) http authentication support.
 - LDAP authentication
 - External OAuth provider authentication
 - A [job queue](https://git.pleroma.social/pleroma/pleroma_job_queue) for federation, emails, web push, etc.
diff --git a/config/config.exs b/config/config.exs
index 72908266d..c3301b2ed 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -384,6 +384,7 @@
     "activities",
     "api",
     "auth",
+    "check_password",
     "dev",
     "friend-requests",
     "inbox",
@@ -404,6 +405,7 @@
     "status",
     "tag",
     "user-search",
+    "user_exists",
     "users",
     "web"
   ]
diff --git a/docs/config/howto_mongooseim.md b/docs/config/howto_mongooseim.md
new file mode 100644
index 000000000..a33e590a1
--- /dev/null
+++ b/docs/config/howto_mongooseim.md
@@ -0,0 +1,10 @@
+# Configuring MongooseIM (XMPP Server) to use Pleroma for authentication
+
+If you want to give your Pleroma users an XMPP (chat) account, you can configure [MongooseIM](https://github.com/esl/MongooseIM) to use your Pleroma server for user authentication, automatically giving every local user an XMPP account.
+
+In general, you just have to follow the configuration described at [https://mongooseim.readthedocs.io/en/latest/authentication-backends/HTTP-authentication-module/](https://mongooseim.readthedocs.io/en/latest/authentication-backends/HTTP-authentication-module/) and do these changes to your mongooseim.cfg.
+
+1. Set the auth_method to `{auth_method, http}`.
+2. Add the http auth pool like this: `{http, global, auth, [{workers, 50}], [{server, "https://yourpleromainstance.com"}]}`
+
+Restart your MongooseIM server, your users should now be able to connect with their Pleroma credentials.
diff --git a/lib/pleroma/web/mongooseim/mongoose_im_controller.ex b/lib/pleroma/web/mongooseim/mongoose_im_controller.ex
new file mode 100644
index 000000000..489d5d3a5
--- /dev/null
+++ b/lib/pleroma/web/mongooseim/mongoose_im_controller.ex
@@ -0,0 +1,41 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.MongooseIM.MongooseIMController do
+  use Pleroma.Web, :controller
+  alias Comeonin.Pbkdf2
+  alias Pleroma.Repo
+  alias Pleroma.User
+
+  def user_exists(conn, %{"user" => username}) do
+    with %User{} <- Repo.get_by(User, nickname: username, local: 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} <-
+           Repo.get_by(User, nickname: username, local: true),
+         true <- Pbkdf2.checkpw(password, password_hash) do
+      conn
+      |> json(true)
+    else
+      false ->
+        conn
+        |> put_status(403)
+        |> json(false)
+
+      _ ->
+        conn
+        |> put_status(:not_found)
+        |> json(false)
+    end
+  end
+end
diff --git a/lib/pleroma/web/router.ex b/lib/pleroma/web/router.ex
index 49e28cc2d..352268b96 100644
--- a/lib/pleroma/web/router.ex
+++ b/lib/pleroma/web/router.ex
@@ -707,6 +707,11 @@ defmodule Pleroma.Web.Router do
     end
   end
 
+  scope "/", Pleroma.Web.MongooseIM do
+    get("/user_exists", MongooseIMController, :user_exists)
+    get("/check_password", MongooseIMController, :check_password)
+  end
+
   scope "/", Fallback do
     get("/registration/:token", RedirectController, :registration_page)
     get("/:maybe_nickname_or_id", RedirectController, :redirector_with_meta)
diff --git a/test/web/mongooseim/mongoose_im_controller_test.exs b/test/web/mongooseim/mongoose_im_controller_test.exs
new file mode 100644
index 000000000..eb83999bb
--- /dev/null
+++ b/test/web/mongooseim/mongoose_im_controller_test.exs
@@ -0,0 +1,59 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.MongooseIMController do
+  use Pleroma.Web.ConnCase
+  import Pleroma.Factory
+
+  test "/user_exists", %{conn: conn} do
+    _user = insert(:user, nickname: "lain")
+    _remote_user = insert(:user, nickname: "alice", local: false)
+
+    res =
+      conn
+      |> get(mongoose_im_path(conn, :user_exists), user: "lain")
+      |> json_response(200)
+
+    assert res == true
+
+    res =
+      conn
+      |> get(mongoose_im_path(conn, :user_exists), user: "alice")
+      |> json_response(404)
+
+    assert res == false
+
+    res =
+      conn
+      |> get(mongoose_im_path(conn, :user_exists), user: "bob")
+      |> json_response(404)
+
+    assert res == false
+  end
+
+  test "/check_password", %{conn: conn} do
+    user = insert(:user, password_hash: Comeonin.Pbkdf2.hashpwsalt("cool"))
+
+    res =
+      conn
+      |> get(mongoose_im_path(conn, :check_password), user: user.nickname, pass: "cool")
+      |> json_response(200)
+
+    assert res == true
+
+    res =
+      conn
+      |> get(mongoose_im_path(conn, :check_password), user: user.nickname, pass: "uncool")
+      |> json_response(403)
+
+    assert res == false
+
+    res =
+      conn
+      |> get(mongoose_im_path(conn, :check_password), user: "nobody", pass: "cool")
+      |> json_response(404)
+
+    assert res == false
+  end
+end