Chapril/xmpp.chapril.org-ejabberd
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JWT enhancement (#3460)

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* ref: run the default JWT verifier as hook callback

* ref: add system timestamp to JWT debug log
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Pouriya 2020-12-28 12:36:45 +03:30 committed by GitHub
parent bd08f408ca
commit c056002f7c
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1 changed files with 37 additions and 18 deletions
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55
src/ejabberd_auth_jwt.erl
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@ -33,6 +33,8 @@
store_type/1, plain_password_required/1,
user_exists/2, use_cache/1
]).
%% 'ejabberd_hooks' callback:
-export([check_decoded_jwt/5]).
-include_lib("xmpp/include/xmpp.hrl").
-include("logger.hrl").
@ -41,6 +43,12 @@
%%% API
%%%----------------------------------------------------------------------
start(Host) ->
%% We add our default JWT verifier with hook priority 100.
%% So if you need to check or verify your custom JWT before the
%% default verifier, It's better to use this hook with priority
%% little than 100 and return bool() or {stop, bool()} in your own
%% callback function.
ejabberd_hooks:add(check_decoded_jwt, Host, ?MODULE, check_decoded_jwt, 100),
case ejabberd_option:jwt_key(Host) of
undefined ->
?ERROR_MSG("Option jwt_key is not configured for ~ts: "
@ -49,7 +57,8 @@ start(Host) ->
ok
end.
stop(_Host) -> ok.
stop(Host) ->
ejabberd_hooks:delete(check_decoded_jwt, Host, ?MODULE, check_decoded_jwt, 100).
plain_password_required(_Host) -> true.
@ -81,36 +90,47 @@ user_exists(_User, _Host) -> {nocache, false}.
use_cache(_) ->
false.
%%%----------------------------------------------------------------------
%%% 'ejabberd_hooks' callback
%%%----------------------------------------------------------------------
check_decoded_jwt(true, Fields, _Signature, Server, User) ->
JidField = ejabberd_option:jwt_jid_field(Server),
case maps:find(JidField, Fields) of
{ok, SJid} when is_binary(SJid) ->
try
JID = jid:decode(SJid),
JID#jid.luser == User andalso JID#jid.lserver == Server
catch error:{bad_jid, _} ->
false
end;
_ -> % error | {ok, _UnknownType}
false
end;
check_decoded_jwt(Acc, _, _, _, _) ->
Acc.
%%%----------------------------------------------------------------------
%%% Internal functions
%%%----------------------------------------------------------------------
check_jwt_token(User, Server, Token) ->
JWK = ejabberd_option:jwt_key(Server),
JidField = ejabberd_option:jwt_jid_field(Server),
try jose_jwt:verify(JWK, Token) of
{true, {jose_jwt, Fields}, Signature} ->
?DEBUG("jwt verify: ~p - ~p~n", [Fields, Signature]),
Now = erlang:system_time(second),
?DEBUG("jwt verify at system timestamp ~p: ~p - ~p~n", [Now, Fields, Signature]),
case maps:find(<<"exp">>, Fields) of
error ->
%% No expiry in token => We consider token invalid:
false;
{ok, Exp} ->
Now = erlang:system_time(second),
if
Exp > Now ->
case maps:find(JidField, Fields) of
error ->
false;
{ok, SJID} ->
try jid:decode(SJID) of
JID ->
(JID#jid.luser == User) andalso
(JID#jid.lserver == Server) andalso
ejabberd_hooks:run_fold(check_decoded_jwt, Server, true, [Fields, Signature, User])
catch error:{bad_jid, _} ->
false
end
end;
ejabberd_hooks:run_fold(
check_decoded_jwt,
Server,
true,
[Fields, Signature, Server, User]
);
true ->
%% return false, if token has expired
false
@ -122,4 +142,3 @@ check_jwt_token(User, Server, Token) ->
error:{badarg, _} ->
false
end.