authentication_plug.ex
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authentication_plug.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.Web.Plugs.AuthenticationPlug do
	@moduledoc "Password authentication plug."

	alias Pleroma.Helpers.AuthHelper
	alias Pleroma.User

	import Plug.Conn

	require Logger

	def init(options), do: options

	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)
	\|> AuthHelper.skip_oauth()
	else
	conn
	end
	end

	def call(conn, _), do: conn

	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
	Pleroma.Password.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, _), do: {:ok, user}

	defp do_update_password(user, password) do
	User.reset_password(user, %{password: password, password_confirmation: password})
	end
	end