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diff --git a/lib/pleroma/web/plugs/authentication_plug.ex b/lib/pleroma/web/plugs/authentication_plug.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Plugs.AuthenticationPlug do
+ alias Pleroma.User
+
+ import Plug.Conn
+
+ require Logger
+
+ def init(options), do: options
+
+ def checkpw(password, "$6" <> _ = password_hash) do
+ :crypt.crypt(password, password_hash) == password_hash
+ end
+
+ def checkpw(password, "$2" <> _ = password_hash) do
+ # Handle bcrypt passwords for Mastodon migration
+ Bcrypt.verify_pass(password, password_hash)
+ end
+
+ def checkpw(password, "$pbkdf2" <> _ = password_hash) do
+ Pbkdf2.verify_pass(password, password_hash)
+ end
+
+ def checkpw(_password, _password_hash) do
+ Logger.error("Password hash not recognized")
+ false
+ end
+
+ def maybe_update_password(%User{password_hash: "$2" <> _} = user, password) do
+ do_update_password(user, password)
+ end
+
+ def maybe_update_password(%User{password_hash: "$6" <> _} = user, password) do
+ do_update_password(user, password)
+ end
+
+ def maybe_update_password(user, _), do: {:ok, user}
+
+ defp do_update_password(user, password) do
+ user
+ |> User.password_update_changeset(%{
+ "password" => password,
+ "password_confirmation" => password
+ })
+ |> Pleroma.Repo.update()
+ end
+
+ def call(%{assigns: %{user: %User{}}} = conn, _), do: conn
+
+ def call(
+ %{
+ assigns: %{
+ auth_user: %{password_hash: password_hash} = auth_user,
+ auth_credentials: %{password: password}
+ }
+ } = conn,
+ _
+ ) do
+ if checkpw(password, password_hash) do
+ {:ok, auth_user} = maybe_update_password(auth_user, password)
+
+ conn
+ |> assign(:user, auth_user)
+ |> Pleroma.Web.Plugs.OAuthScopesPlug.skip_plug()
+ else
+ conn
+ end
+ end
+
+ def call(%{assigns: %{auth_credentials: %{password: _}}} = conn, _) do
+ Pbkdf2.no_user_verify()
+ conn
+ end
+
+ def call(conn, _), do: conn
+end