detect and use sha512-crypt for stored password hash.

lib/pleroma/plugs/authentication_plug.ex

@@ -6,11 +6,24 @@ defmodule Pleroma.Plugs.AuthenticationPlug do
   alias Comeonin.Pbkdf2
   import Plug.Conn
   alias Pleroma.User
+  require Logger
 
   def init(options) do
     options
   end
 
+  def checkpw(password, password_hash) do
+    cond do
+      String.starts_with?(password_hash, "$pbkdf2") ->
+        Pbkdf2.checkpw(password, password_hash)
+      String.starts_with?(password_hash, "$6") ->
+        :crypt.crypt(password, password_hash) == password_hash
+      true ->
+        Logger.error("Password hash not recognized")
+        false
+    end
+  end
+
   def call(%{assigns: %{user: %User{}}} = conn, _), do: conn
 
   def call(

lib/pleroma/web/auth/pleroma_authenticator.ex

@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.Auth.PleromaAuthenticator do
-  alias Comeonin.Pbkdf2
+  alias Pleroma.Plugs.AuthenticationPlug
   alias Pleroma.Registration
   alias Pleroma.Repo
   alias Pleroma.User
@@ -16,7 +16,7 @@ defmodule Pleroma.Web.Auth.PleromaAuthenticator do
   def get_user(%Plug.Conn{} = conn) do
     with {:ok, {name, password}} <- fetch_credentials(conn),
          {_, %User{} = user} <- {:user, fetch_user(name)},
-         {_, true} <- {:checkpw, Pbkdf2.checkpw(password, user.password_hash)} do
+         {_, true} <- {:checkpw, AuthenticationPlug.checkpw(password, user.password_hash)} do
       {:ok, user}
     else
       error ->

lib/pleroma/web/common_api/utils.ex

@@ -6,11 +6,11 @@ defmodule Pleroma.Web.CommonAPI.Utils do
   import Pleroma.Web.Gettext
 
   alias Calendar.Strftime
-  alias Comeonin.Pbkdf2
   alias Pleroma.Activity
   alias Pleroma.Config
   alias Pleroma.Formatter
   alias Pleroma.Object
+  alias Pleroma.Plugs.AuthenticationPlug
   alias Pleroma.Repo
   alias Pleroma.User
   alias Pleroma.Web.ActivityPub.Utils
@@ -371,7 +371,7 @@ defp shortname(name) do
 
   def confirm_current_password(user, password) do
     with %User{local: true} = db_user <- User.get_cached_by_id(user.id),
-         true <- Pbkdf2.checkpw(password, db_user.password_hash) do
+         true <- AuthenticationPlug.checkpw(password, db_user.password_hash) do
       {:ok, db_user}
     else
       _ -> {:error, dgettext("errors", "Invalid password.")}

lib/pleroma/web/twitter_api/controllers/util_controller.ex

@@ -7,10 +7,10 @@ defmodule Pleroma.Web.TwitterAPI.UtilController do
 
   require Logger
 
-  alias Comeonin.Pbkdf2
   alias Pleroma.Activity
   alias Pleroma.Emoji
   alias Pleroma.Notification
+  alias Pleroma.Plugs.AuthenticationPlug
   alias Pleroma.User
   alias Pleroma.Web
   alias Pleroma.Web.ActivityPub.ActivityPub
@@ -96,7 +96,7 @@ def do_remote_follow(conn, %{
     name = followee.nickname
 
     with %User{} = user <- User.get_cached_by_nickname(username),
-         true <- Pbkdf2.checkpw(password, user.password_hash),
+         true <- AuthenticationPlug.checkpw(password, user.password_hash),
          %User{} = _followed <- User.get_cached_by_id(id),
          {:ok, follower} <- User.follow(user, followee),
          {:ok, _activity} <- ActivityPub.follow(follower, followee) do