Chapril/xmpp.chapril.org-ejabberd
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xmpp.chapril.org-ejabberd/src/ejabberd_auth_ldap.erl
Evgeniy Khramtsov 7bcbea2108 Deprecate jlib.erl in favor of aux.erl 
Since the main goal of jlib.erl is lost, all auxiliary functions
are now moved to aux.erl, and the whole jlib.erl is now deprecated.
2017-03-30 14:17:13 +03:00

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%%%----------------------------------------------------------------------
%%% File : ejabberd_auth_ldap.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Authentification via LDAP
%%% Created : 12 Dec 2004 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2017 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%----------------------------------------------------------------------
-module(ejabberd_auth_ldap).
-behaviour(ejabberd_config).
-author('alexey@process-one.net').
-behaviour(gen_server).
-behaviour(ejabberd_auth).
%% gen_server callbacks
-export([init/1, handle_info/2, handle_call/3,
handle_cast/2, terminate/2, code_change/3]).
-export([start/1, stop/1, start_link/1, set_password/3,
check_password/4, check_password/6, try_register/3,
dirty_get_registered_users/0, get_vh_registered_users/1,
get_vh_registered_users/2,
get_vh_registered_users_number/1,
get_vh_registered_users_number/2, get_password/2,
get_password_s/2, is_user_exists/2, remove_user/2,
remove_user/3, store_type/0, plain_password_required/0,
opt_type/1]).
-include("ejabberd.hrl").
-include("logger.hrl").
-include("eldap.hrl").
-record(state,
{host = <<"">> :: binary(),
eldap_id = <<"">> :: binary(),
bind_eldap_id = <<"">> :: binary(),
servers = [] :: [binary()],
backups = [] :: [binary()],
port = ?LDAP_PORT :: inet:port_number(),
tls_options = [] :: list(),
dn = <<"">> :: binary(),
password = <<"">> :: binary(),
base = <<"">> :: binary(),
uids = [] :: [{binary()} | {binary(), binary()}],
ufilter = <<"">> :: binary(),
sfilter = <<"">> :: binary(),
lfilter :: {any(), any()} | undefined,
deref_aliases = never :: never | searching | finding | always,
dn_filter :: binary() | undefined,
dn_filter_attrs = [] :: [binary()]}).
handle_cast(_Request, State) -> {noreply, State}.
code_change(_OldVsn, State, _Extra) -> {ok, State}.
handle_info(_Info, State) -> {noreply, State}.
-define(LDAP_SEARCH_TIMEOUT, 5).
%%%----------------------------------------------------------------------
%%% API
%%%----------------------------------------------------------------------
start(Host) ->
Proc = gen_mod:get_module_proc(Host, ?MODULE),
ChildSpec = {Proc, {?MODULE, start_link, [Host]},
transient, 1000, worker, [?MODULE]},
supervisor:start_child(ejabberd_backend_sup, ChildSpec).
stop(Host) ->
Proc = gen_mod:get_module_proc(Host, ?MODULE),
supervisor:terminate_child(ejabberd_backend_sup, Proc),
supervisor:delete_child(ejabberd_backend_sup, Proc).
start_link(Host) ->
Proc = gen_mod:get_module_proc(Host, ?MODULE),
gen_server:start_link({local, Proc}, ?MODULE, Host, []).
terminate(_Reason, _State) -> ok.
init(Host) ->
process_flag(trap_exit, true),
State = parse_options(Host),
eldap_pool:start_link(State#state.eldap_id,
State#state.servers, State#state.backups,
State#state.port, State#state.dn,
State#state.password, State#state.tls_options),
eldap_pool:start_link(State#state.bind_eldap_id,
State#state.servers, State#state.backups,
State#state.port, State#state.dn,
State#state.password, State#state.tls_options),
{ok, State}.
plain_password_required() -> true.
store_type() -> external.
check_password(User, AuthzId, Server, Password) ->
if AuthzId /= <<>> andalso AuthzId /= User ->
false;
true ->
if Password == <<"">> -> false;
true ->
case catch check_password_ldap(User, Server, Password) of
{'EXIT', _} -> false;
Result -> Result
end
end
end.
check_password(User, AuthzId, Server, Password, _Digest,
_DigestGen) ->
check_password(User, AuthzId, Server, Password).
set_password(User, Server, Password) ->
{ok, State} = eldap_utils:get_state(Server, ?MODULE),
case find_user_dn(User, State) of
false -> {error, user_not_found};
DN ->
eldap_pool:modify_passwd(State#state.eldap_id, DN,
Password)
end.
%% @spec (User, Server, Password) -> {error, not_allowed}
try_register(_User, _Server, _Password) ->
{error, not_allowed}.
dirty_get_registered_users() ->
Servers = ejabberd_config:get_vh_by_auth_method(ldap),
lists:flatmap(fun (Server) ->
get_vh_registered_users(Server)
end,
Servers).
get_vh_registered_users(Server) ->
case catch get_vh_registered_users_ldap(Server) of
{'EXIT', _} -> [];
Result -> Result
end.
get_vh_registered_users(Server, _) ->
get_vh_registered_users(Server).
get_vh_registered_users_number(Server) ->
length(get_vh_registered_users(Server)).
get_vh_registered_users_number(Server, _) ->
get_vh_registered_users_number(Server).
get_password(_User, _Server) -> false.
get_password_s(_User, _Server) -> <<"">>.
%% @spec (User, Server) -> true | false | {error, Error}
is_user_exists(User, Server) ->
case catch is_user_exists_ldap(User, Server) of
{'EXIT', Error} -> {error, Error};
Result -> Result
end.
remove_user(_User, _Server) -> {error, not_allowed}.
remove_user(_User, _Server, _Password) -> not_allowed.
%%%----------------------------------------------------------------------
%%% Internal functions
%%%----------------------------------------------------------------------
check_password_ldap(User, Server, Password) ->
{ok, State} = eldap_utils:get_state(Server, ?MODULE),
case find_user_dn(User, State) of
false -> false;
DN ->
case eldap_pool:bind(State#state.bind_eldap_id, DN,
Password)
of
ok -> true;
_ -> false
end
end.
get_vh_registered_users_ldap(Server) ->
{ok, State} = eldap_utils:get_state(Server, ?MODULE),
UIDs = State#state.uids,
Eldap_ID = State#state.eldap_id,
Server = State#state.host,
ResAttrs = result_attrs(State),
case eldap_filter:parse(State#state.sfilter) of
{ok, EldapFilter} ->
case eldap_pool:search(Eldap_ID,
[{base, State#state.base},
{filter, EldapFilter},
{timeout, ?LDAP_SEARCH_TIMEOUT},
{deref_aliases, State#state.deref_aliases},
{attributes, ResAttrs}])
of
#eldap_search_result{entries = Entries} ->
lists:flatmap(fun (#eldap_entry{attributes = Attrs,
object_name = DN}) ->
case is_valid_dn(DN, Attrs, State) of
false -> [];
_ ->
case
eldap_utils:find_ldap_attrs(UIDs,
Attrs)
of
<<"">> -> [];
{User, UIDFormat} ->
case
eldap_utils:get_user_part(User,
UIDFormat)
of
{ok, U} ->
case jid:nodeprep(U) of
error -> [];
LU ->
[{LU,
jid:nameprep(Server)}]
end;
_ -> []
end
end
end
end,
Entries);
_ -> []
end;
_ -> []
end.
is_user_exists_ldap(User, Server) ->
{ok, State} = eldap_utils:get_state(Server, ?MODULE),
case find_user_dn(User, State) of
false -> false;
_DN -> true
end.
handle_call(get_state, _From, State) ->
{reply, {ok, State}, State};
handle_call(stop, _From, State) ->
{stop, normal, ok, State};
handle_call(_Request, _From, State) ->
{reply, bad_request, State}.
find_user_dn(User, State) ->
ResAttrs = result_attrs(State),
case eldap_filter:parse(State#state.ufilter,
[{<<"%u">>, User}])
of
{ok, Filter} ->
case eldap_pool:search(State#state.eldap_id,
[{base, State#state.base}, {filter, Filter},
{deref_aliases, State#state.deref_aliases},
{attributes, ResAttrs}])
of
#eldap_search_result{entries =
[#eldap_entry{attributes = Attrs,
object_name = DN}
| _]} ->
dn_filter(DN, Attrs, State);
_ -> false
end;
_ -> false
end.
%% apply the dn filter and the local filter:
dn_filter(DN, Attrs, State) ->
case check_local_filter(Attrs, State) of
false -> false;
true -> is_valid_dn(DN, Attrs, State)
end.
%% Check that the DN is valid, based on the dn filter
is_valid_dn(DN, _, #state{dn_filter = undefined}) -> DN;
is_valid_dn(DN, Attrs, State) ->
DNAttrs = State#state.dn_filter_attrs,
UIDs = State#state.uids,
Values = [{<<"%s">>,
eldap_utils:get_ldap_attr(Attr, Attrs), 1}
|| Attr <- DNAttrs],
SubstValues = case eldap_utils:find_ldap_attrs(UIDs,
Attrs)
of
<<"">> -> Values;
{S, UAF} ->
case eldap_utils:get_user_part(S, UAF) of
{ok, U} -> [{<<"%u">>, U} | Values];
_ -> Values
end
end
++ [{<<"%d">>, State#state.host}, {<<"%D">>, DN}],
case eldap_filter:parse(State#state.dn_filter,
SubstValues)
of
{ok, EldapFilter} ->
case eldap_pool:search(State#state.eldap_id,
[{base, State#state.base},
{filter, EldapFilter},
{deref_aliases, State#state.deref_aliases},
{attributes, [<<"dn">>]}])
of
#eldap_search_result{entries = [_ | _]} -> DN;
_ -> false
end;
_ -> false
end.
%% The local filter is used to check an attribute in ejabberd
%% and not in LDAP to limit the load on the LDAP directory.
%% A local rule can be either:
%% {equal, {"accountStatus",["active"]}}
%% {notequal, {"accountStatus",["disabled"]}}
%% {ldap_local_filter, {notequal, {"accountStatus",["disabled"]}}}
check_local_filter(_Attrs,
#state{lfilter = undefined}) ->
true;
check_local_filter(Attrs,
#state{lfilter = LocalFilter}) ->
{Operation, FilterMatch} = LocalFilter,
local_filter(Operation, Attrs, FilterMatch).
local_filter(equal, Attrs, FilterMatch) ->
{Attr, Value} = FilterMatch,
case lists:keysearch(Attr, 1, Attrs) of
false -> false;
{value, {Attr, Value}} -> true;
_ -> false
end;
local_filter(notequal, Attrs, FilterMatch) ->
not local_filter(equal, Attrs, FilterMatch).
result_attrs(#state{uids = UIDs,
dn_filter_attrs = DNFilterAttrs}) ->
lists:foldl(fun ({UID}, Acc) -> [UID | Acc];
({UID, _}, Acc) -> [UID | Acc]
end,
DNFilterAttrs, UIDs).
%%%----------------------------------------------------------------------
%%% Auxiliary functions
%%%----------------------------------------------------------------------
parse_options(Host) ->
Cfg = eldap_utils:get_config(Host, []),
Eldap_ID = aux:atom_to_binary(gen_mod:get_module_proc(Host, ?MODULE)),
Bind_Eldap_ID = aux:atom_to_binary(
gen_mod:get_module_proc(Host, bind_ejabberd_auth_ldap)),
UIDsTemp = gen_mod:get_opt(
{ldap_uids, Host}, [],
fun(Us) ->
lists:map(
fun({U, P}) ->
{iolist_to_binary(U),
iolist_to_binary(P)};
({U}) ->
{iolist_to_binary(U)};
(U) ->
{iolist_to_binary(U)}
end, lists:flatten(Us))
end, [{<<"uid">>, <<"%u">>}]),
UIDs = eldap_utils:uids_domain_subst(Host, UIDsTemp),
SubFilter = eldap_utils:generate_subfilter(UIDs),
UserFilter = case gen_mod:get_opt(
{ldap_filter, Host}, [],
fun check_filter/1, <<"">>) of
<<"">> ->
SubFilter;
F ->
<<"(&", SubFilter/binary, F/binary, ")">>
end,
SearchFilter = eldap_filter:do_sub(UserFilter,
[{<<"%u">>, <<"*">>}]),
{DNFilter, DNFilterAttrs} =
gen_mod:get_opt({ldap_dn_filter, Host}, [],
fun([{DNF, DNFA}]) ->
NewDNFA = case DNFA of
undefined ->
[];
_ ->
[iolist_to_binary(A)
|| A <- DNFA]
end,
NewDNF = check_filter(DNF),
{NewDNF, NewDNFA}
end, {undefined, []}),
LocalFilter = gen_mod:get_opt(
{ldap_local_filter, Host}, [], fun(V) -> V end),
#state{host = Host, eldap_id = Eldap_ID,
bind_eldap_id = Bind_Eldap_ID,
servers = Cfg#eldap_config.servers,
backups = Cfg#eldap_config.backups,
port = Cfg#eldap_config.port,
tls_options = Cfg#eldap_config.tls_options,
dn = Cfg#eldap_config.dn,
password = Cfg#eldap_config.password,
base = Cfg#eldap_config.base,
deref_aliases = Cfg#eldap_config.deref_aliases,
uids = UIDs, ufilter = UserFilter,
sfilter = SearchFilter, lfilter = LocalFilter,
dn_filter = DNFilter, dn_filter_attrs = DNFilterAttrs}.
check_filter(F) ->
NewF = iolist_to_binary(F),
{ok, _} = eldap_filter:parse(NewF),
NewF.
opt_type(ldap_dn_filter) ->
fun ([{DNF, DNFA}]) ->
NewDNFA = case DNFA of
undefined -> [];
_ -> [iolist_to_binary(A) || A <- DNFA]
end,
NewDNF = check_filter(DNF),
{NewDNF, NewDNFA}
end;
opt_type(ldap_filter) -> fun check_filter/1;
opt_type(ldap_local_filter) -> fun (V) -> V end;
opt_type(ldap_uids) ->
fun (Us) ->
lists:map(fun ({U, P}) ->
{iolist_to_binary(U), iolist_to_binary(P)};
({U}) -> {iolist_to_binary(U)};
(U) -> {iolist_to_binary(U)}
end,
lists:flatten(Us))
end;
opt_type(_) ->
[ldap_dn_filter, ldap_filter, ldap_local_filter,
ldap_uids].
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