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# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Auth.LDAPAuthenticator do
alias Pleroma.User
require Logger
import Pleroma.Web.Auth.Authenticator,
only: [fetch_credentials: 1, fetch_user: 1]
@behaviour Pleroma.Web.Auth.Authenticator
@base Pleroma.Web.Auth.PleromaAuthenticator
@connection_timeout 10_000
@search_timeout 10_000
defdelegate get_registration(conn), to: @base
defdelegate create_from_registration(conn, registration), to: @base
defdelegate handle_error(conn, error), to: @base
defdelegate auth_template, to: @base
defdelegate oauth_consumer_template, to: @base
def get_user(%Plug.Conn{} = conn) do
with {:ldap, true} <- {:ldap, Pleroma.Config.get([:ldap, :enabled])},
{:ok, {name, password}} <- fetch_credentials(conn),
%User{} = user <- ldap_user(name, password) do
{:ok, user}
else
{:error, {:ldap_connection_error, _}} ->
# When LDAP is unavailable, try default authenticator
@base.get_user(conn)
{:ldap, _} ->
@base.get_user(conn)
error ->
error
end
end
defp ldap_user(name, password) do
ldap = Pleroma.Config.get(:ldap, [])
host = Keyword.get(ldap, :host, "localhost")
port = Keyword.get(ldap, :port, 389)
ssl = Keyword.get(ldap, :ssl, false)
sslopts = Keyword.get(ldap, :sslopts, [])
options =
[{:port, port}, {:ssl, ssl}, {:timeout, @connection_timeout}] ++
if sslopts != [], do: [{:sslopts, sslopts}], else: []
case :eldap.open([to_charlist(host)], options) do
{:ok, connection} ->
try do
if Keyword.get(ldap, :tls, false) do
:application.ensure_all_started(:ssl)
case :eldap.start_tls(
connection,
Keyword.get(ldap, :tlsopts, []),
@connection_timeout
) do
:ok ->
:ok
error ->
Logger.error("Could not start TLS: #{inspect(error)}")
end
end
bind_user(connection, ldap, name, password)
after
:eldap.close(connection)
end
{:error, error} ->
Logger.error("Could not open LDAP connection: #{inspect(error)}")
{:error, {:ldap_connection_error, error}}
end
end
defp bind_user(connection, ldap, name, password) do
uid = Keyword.get(ldap, :uid, "cn")
base = Keyword.get(ldap, :base)
case :eldap.simple_bind(connection, "#{uid}=#{name},#{base}", password) do
:ok ->
case fetch_user(name) do
%User{} = user ->
user
_ ->
register_user(connection, base, uid, name, password)
end
error ->
error
end
end
defp register_user(connection, base, uid, name, password) do
case :eldap.search(connection, [
{:base, to_charlist(base)},
{:filter, :eldap.equalityMatch(to_charlist(uid), to_charlist(name))},
{:scope, :eldap.wholeSubtree()},
{:attributes, ['mail', 'email']},
{:timeout, @search_timeout}
]) do
{:ok, {:eldap_search_result, [{:eldap_entry, _, attributes}], _}} ->
with {_, [mail]} <- List.keyfind(attributes, 'mail', 0) do
params = %{
email: :erlang.list_to_binary(mail),
name: name,
nickname: name,
password: password,
password_confirmation: password
}
changeset = User.register_changeset(%User{}, params)
case User.register(changeset) do
{:ok, user} -> user
error -> error
end
else
_ ->
Logger.error("Could not find LDAP attribute mail: #{inspect(attributes)}")
{:error, :ldap_registration_missing_attributes}
end
error ->
error
end
end
end
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