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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.Auth.LDAPAuthenticator do
alias Pleroma.User
require Logger
import Pleroma.Web.Auth.Helpers, 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
{: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)
tls = Keyword.get(ldap, :tls, false)
cacertfile = Keyword.get(ldap, :cacertfile) || CAStore.file_path()
default_secure_opts = [
verify: :verify_peer,
cacerts: decode_certfile(cacertfile),
customize_hostname_check: [
fqdn_fun: fn _ -> to_charlist(host) end
]
]
sslopts = Keyword.merge(default_secure_opts, Keyword.get(ldap, :sslopts, []))
tlsopts = Keyword.merge(default_secure_opts, Keyword.get(ldap, :tlsopts, []))
# :sslopts can only be included in :eldap.open/2 when {ssl: true}
# or the connection will fail
options =
if ssl do
[{:port, port}, {:ssl, ssl}, {:sslopts, sslopts}, {:timeout, @connection_timeout}]
else
[{:port, port}, {:ssl, ssl}, {:timeout, @connection_timeout}]
end
case :eldap.open([to_charlist(host)], options) do
{:ok, connection} ->
cond do
ssl ->
:application.ensure_all_started(:ssl)
tls ->
case :eldap.start_tls(
connection,
tlsopts,
@connection_timeout
) do
:ok ->
:ok
error ->
Logger.error("Could not start TLS: #{inspect(error)}")
:eldap.close(connection)
end
true ->
:ok
end
bind_user(connection, ldap, name, password)
{: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)
end
error ->
Logger.error("Could not bind LDAP user #{name}: #{inspect(error)}")
{:error, {:ldap_bind_error, error}}
end
end
defp register_user(connection, base, uid, name) do
case :eldap.search(connection, [
{:base, to_charlist(base)},
{:filter, :eldap.equalityMatch(to_charlist(uid), to_charlist(name))},
{:scope, :eldap.wholeSubtree()},
{:timeout, @search_timeout}
]) do
# The :eldap_search_result record structure changed in OTP 24.3 and added a controls field
# https://github.com/erlang/otp/pull/5538
{:ok, {:eldap_search_result, [{:eldap_entry, _object, attributes}], _referrals}} ->
try_register(name, attributes)
{:ok, {:eldap_search_result, [{:eldap_entry, _object, attributes}], _referrals, _controls}} ->
try_register(name, attributes)
error ->
Logger.error("Couldn't register user because LDAP search failed: #{inspect(error)}")
{:error, {:ldap_search_error, error}}
end
end
defp try_register(name, attributes) do
params = %{
name: name,
nickname: name,
password: nil
}
params =
case List.keyfind(attributes, ~c"mail", 0) do
{_, [mail]} -> Map.put_new(params, :email, :erlang.list_to_binary(mail))
_ -> params
end
changeset = User.register_changeset_ldap(%User{}, params)
case User.register(changeset) do
{:ok, user} -> user
error -> error
end
end
defp decode_certfile(file) do
with {:ok, data} <- File.read(file) do
data
|> :public_key.pem_decode()
|> Enum.map(fn {_, b, _} -> b end)
else
_ ->
Logger.error("Unable to read certfile: #{file}")
[]
end
end
end
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