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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.Auth.LDAPAuthenticator do
   6   alias Pleroma.User
   7
   8   require Logger
   9
  10   @behaviour Pleroma.Web.Auth.Authenticator
  11
  12   @connection_timeout 10_000
  13   @search_timeout 10_000
  14
  15   def get_user(%Plug.Conn{} = conn) do
  16     if Pleroma.Config.get([:ldap, :enabled]) do
  17       {name, password} =
  18         case conn.params do
  19           %{"authorization" => %{"name" => name, "password" => password}} ->
  20             {name, password}
  21
  22           %{"grant_type" => "password", "username" => name, "password" => password} ->
  23             {name, password}
  24         end
  25
  26       case ldap_user(name, password) do
  27         %User{} = user ->
  28           {:ok, user}
  29
  30         {:error, {:ldap_connection_error, _}} ->
  31           # When LDAP is unavailable, try default authenticator
  32           Pleroma.Web.Auth.PleromaAuthenticator.get_user(conn)
  33
  34         error ->
  35           error
  36       end
  37     else
  38       # Fall back to default authenticator
  39       Pleroma.Web.Auth.PleromaAuthenticator.get_user(conn)
  40     end
  41   end
  42
  43   def handle_error(%Plug.Conn{} = _conn, error) do
  44     error
  45   end
  46
  47   def auth_template, do: nil
  48
  49   defp ldap_user(name, password) do
  50     ldap = Pleroma.Config.get(:ldap, [])
  51     host = Keyword.get(ldap, :host, "localhost")
  52     port = Keyword.get(ldap, :port, 389)
  53     ssl = Keyword.get(ldap, :ssl, false)
  54     sslopts = Keyword.get(ldap, :sslopts, [])
  55
  56     options =
  57       [{:port, port}, {:ssl, ssl}, {:timeout, @connection_timeout}] ++
  58         if sslopts != [], do: [{:sslopts, sslopts}], else: []
  59
  60     case :eldap.open([to_charlist(host)], options) do
  61       {:ok, connection} ->
  62         try do
  63           uid = Keyword.get(ldap, :uid, "cn")
  64           base = Keyword.get(ldap, :base)
  65
  66           case :eldap.simple_bind(connection, "#{uid}=#{name},#{base}", password) do
  67             :ok ->
  68               case User.get_by_nickname_or_email(name) do
  69                 %User{} = user ->
  70                   user
  71
  72                 _ ->
  73                   register_user(connection, base, uid, name, password)
  74               end
  75
  76             error ->
  77               error
  78           end
  79         after
  80           :eldap.close(connection)
  81         end
  82
  83       {:error, error} ->
  84         Logger.error("Could not open LDAP connection: #{inspect(error)}")
  85         {:error, {:ldap_connection_error, error}}
  86     end
  87   end
  88
  89   defp register_user(connection, base, uid, name, password) do
  90     case :eldap.search(connection, [
  91            {:base, to_charlist(base)},
  92            {:filter, :eldap.equalityMatch(to_charlist(uid), to_charlist(name))},
  93            {:scope, :eldap.wholeSubtree()},
  94            {:timeout, @search_timeout}
  95          ]) do
  96       {:ok, {:eldap_search_result, [{:eldap_entry, _, attributes}], _}} ->
  97         with {_, [mail]} <- List.keyfind(attributes, 'mail', 0) do
  98           params = %{
  99             email: :erlang.list_to_binary(mail),
 100             name: name,
 101             nickname: name,
 102             password: password,
 103             password_confirmation: password
 104           }
 105
 106           changeset = User.register_changeset(%User{}, params)
 107
 108           case User.register(changeset) do
 109             {:ok, user} -> user
 110             error -> error
 111           end
 112         else
 113           _ -> {:error, :ldap_registration_missing_attributes}
 114         end
 115
 116       error ->
 117         error
 118     end
 119   end
 120 end