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Merge pull request #3235 from weiss/xep-0215

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Support STUN/TURN service discovery
This commit is contained in:
Jérôme Sautret 2020-04-28 16:03:21 +02:00 committed by GitHub
commit 24a11fc8e8
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12 changed files with 932 additions and 13 deletions
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1
ejabberd.yml.example
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@ -203,6 +203,7 @@ modules:
mod_shared_roster: {}
mod_stream_mgmt:
resend_on_timeout: if_offline
mod_stun_disco: {}
mod_vcard: {}
mod_vcard_xupdate: {}
mod_version:

4
mix.exs
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@ -85,12 +85,12 @@ defmodule Ejabberd.Mixfile do
[{:lager, "~> 3.6.0"},
{:p1_utils, "~> 1.0"},
{:fast_xml, "~> 1.1"},
{:xmpp, "~> 1.4"},
{:xmpp, git: "https://github.com/processone/xmpp", ref: "f8c5b3bb"},
{:cache_tab, "~> 1.0"},
{:stringprep, "~> 1.0"},
{:fast_yaml, "~> 1.0"},
{:fast_tls, "~> 1.1"},
{:stun, "~> 1.0"},
{:stun, git: "https://github.com/processone/stun", ref: "f1516827", override: true},
{:esip, "~> 1.0"},
{:p1_mysql, "~> 1.0"},
{:mqtree, "~> 1.0"},

4
rebar.config
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@ -25,7 +25,7 @@
{stringprep, ".*", {git, "https://github.com/processone/stringprep", {tag, "1.0.19"}}},
{fast_xml, ".*", {git, "https://github.com/processone/fast_xml", {tag, "1.1.39"}}},
{idna, ".*", {git, "https://github.com/benoitc/erlang-idna", {tag, "6.0.0"}}},
{xmpp, ".*", {git, "https://github.com/processone/xmpp", "c23e66ebac8fdec4aa08c8926091b0dcf6dacf22"}},
{xmpp, ".*", {git, "https://github.com/processone/xmpp", "f8c5b3bb"}},
{fast_yaml, ".*", {git, "https://github.com/processone/fast_yaml", {tag, "1.0.24"}}},
{yconf, ".*", {git, "https://github.com/processone/yconf", {tag, "1.0.4"}}},
{jiffy, ".*", {git, "https://github.com/davisp/jiffy", {tag, "1.0.4"}}},
@ -36,7 +36,7 @@
{mqtree, ".*", {git, "https://github.com/processone/mqtree", {tag, "1.0.7"}}},
{p1_acme, ".*", {git, "https://github.com/processone/p1_acme.git", {tag, "1.0.5"}}},
{base64url, ".*", {git, "https://github.com/dvv/base64url.git", {tag, "v1.0"}}},
{if_var_true, stun, {stun, ".*", {git, "https://github.com/processone/stun", {tag, "1.0.31"}}}},
{if_var_true, stun, {stun, ".*", {git, "https://github.com/processone/stun", "f1516827"}}},
{if_var_true, sip, {esip, ".*", {git, "https://github.com/processone/esip", {tag, "1.0.32"}}}},
{if_var_true, mysql, {p1_mysql, ".*", {git, "https://github.com/processone/p1_mysql",
"604f7b339e845c2fb4219960a19fc5c048f16c0b"}}},

14
src/ejabberd_stun.erl
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@ -124,13 +124,13 @@ prepare_turn_opts(Opts, _UseTurn = true) ->
Realm = case proplists:get_value(auth_realm, Opts) of
undefined when AuthType == user ->
if NumberOfMyHosts > 1 ->
?WARNING_MSG("You have several virtual "
"hosts configured, but option "
"'auth_realm' is undefined and "
"'auth_type' is set to 'user', "
"most likely the TURN relay won't "
"be working properly. Using ~ts as "
"a fallback", [ejabberd_config:get_myname()]);
?INFO_MSG("You have several virtual hosts "
"configured, but option 'auth_realm' is "
"undefined and 'auth_type' is set to "
"'user', so the TURN relay might not be "
"working properly. Using ~ts as a "
"fallback",
[ejabberd_config:get_myname()]);
true ->
ok
end,

4
src/gen_mod.erl
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@ -86,7 +86,7 @@ start_link() ->
end.
init([]) ->
ejabberd_hooks:add(config_reloaded, ?MODULE, config_reloaded, 50),
ejabberd_hooks:add(config_reloaded, ?MODULE, config_reloaded, 60),
ejabberd_hooks:add(host_up, ?MODULE, start_modules, 40),
ejabberd_hooks:add(host_down, ?MODULE, stop_modules, 70),
ets:new(ejabberd_modules,
@ -97,7 +97,7 @@ init([]) ->
-spec stop() -> ok.
stop() ->
ejabberd_hooks:delete(config_reloaded, ?MODULE, config_reloaded, 50),
ejabberd_hooks:delete(config_reloaded, ?MODULE, config_reloaded, 60),
ejabberd_hooks:delete(host_up, ?MODULE, start_modules, 40),
ejabberd_hooks:delete(host_down, ?MODULE, stop_modules, 70),
stop_modules(),

670
src/mod_stun_disco.erl Normal file
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@ -0,0 +1,670 @@
%%%----------------------------------------------------------------------
%%% File : mod_stun_disco.erl
%%% Author : Holger Weiss <holger@zedat.fu-berlin.de>
%%% Purpose : External Service Discovery (XEP-0215)
%%% Created : 18 Apr 2020 by Holger Weiss <holger@zedat.fu-berlin.de>
%%%
%%%
%%% ejabberd, Copyright (C) 2020 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(mod_stun_disco).
-author('holger@zedat.fu-berlin.de').
-protocol({xep, 215, '0.7'}).
-behaviour(gen_server).
-behaviour(gen_mod).
%% gen_mod callbacks.
-export([start/2,
stop/1,
reload/3,
mod_opt_type/1,
mod_options/1,
depends/2]).
-export([mod_doc/0]).
%% gen_server callbacks.
-export([init/1,
handle_call/3,
handle_cast/2,
handle_info/2,
terminate/2,
code_change/3]).
%% ejabberd_hooks callbacks.
-export([disco_local_features/5, stun_get_password/3]).
%% gen_iq_handler callback.
-export([process_iq/1]).
-include("logger.hrl").
-include("translate.hrl").
-include("xmpp.hrl").
-define(STUN_MODULE, ejabberd_stun).
-type host_or_hash() :: binary() | {hash, binary()}.
-type service_type() :: stun | stuns | turn | turns | undefined.
-record(request,
{host :: binary() | inet:ip_address() | undefined,
port :: 0..65535 | undefined,
transport :: udp | tcp | undefined,
type :: service_type(),
restricted :: true | undefined}).
-record(state,
{host :: binary(),
services :: [service()],
secret :: binary(),
ttl :: non_neg_integer()}).
-type request() :: #request{}.
-type state() :: #state{}.
%%--------------------------------------------------------------------
%% gen_mod callbacks.
%%--------------------------------------------------------------------
-spec start(binary(), gen_mod:opts()) -> {ok, pid()} | {error, any()}.
start(Host, Opts) ->
Proc = get_proc_name(Host),
gen_mod:start_child(?MODULE, Host, Opts, Proc).
-spec stop(binary()) -> ok | {error, any()}.
stop(Host) ->
Proc = get_proc_name(Host),
gen_mod:stop_child(Proc).
-spec reload(binary(), gen_mod:opts(), gen_mod:opts()) -> ok.
reload(Host, NewOpts, OldOpts) ->
cast(Host, {reload, NewOpts, OldOpts}).
-spec depends(binary(), gen_mod:opts()) -> [{module(), hard | soft}].
depends(_Host, _Opts) ->
[].
-spec mod_opt_type(atom()) -> econf:validator().
mod_opt_type(access) ->
econf:acl();
mod_opt_type(credentials_lifetime) ->
econf:timeout(second);
mod_opt_type(offer_local_services) ->
econf:bool();
mod_opt_type(secret) ->
econf:binary();
mod_opt_type(services) ->
econf:list(
econf:and_then(
econf:options(
#{host => econf:either(econf:ip(), econf:binary()),
port => econf:port(),
type => econf:enum([stun, turn, stuns, turns]),
transport => econf:enum([tcp, udp]),
restricted => econf:bool()},
[{required, [host]}]),
fun(Opts) ->
DefPort = fun(stun) -> 3478;
(turn) -> 3478;
(stuns) -> 5349;
(turns) -> 5349
end,
DefTrns = fun(stun) -> udp;
(turn) -> udp;
(stuns) -> tcp;
(turns) -> tcp
end,
DefRstr = fun(stun) -> false;
(turn) -> true;
(stuns) -> false;
(turns) -> true
end,
Host = proplists:get_value(host, Opts),
Type = proplists:get_value(type, Opts, stun),
Port = proplists:get_value(port, Opts, DefPort(Type)),
Trns = proplists:get_value(transport, Opts, DefTrns(Type)),
Rstr = proplists:get_value(restricted, Opts, DefRstr(Type)),
#service{host = Host,
port = Port,
type = Type,
transport = Trns,
restricted = Rstr}
end)).
-spec mod_options(binary()) -> [{services, [tuple()]} | {atom(), any()}].
mod_options(_Host) ->
[{access, local},
{credentials_lifetime, timer:minutes(10)},
{offer_local_services, true},
{secret, undefined},
{services, []}].
mod_doc() ->
#{desc =>
?T("This module allows XMPP clients to discover STUN/TURN services "
"and to obtain temporary credentials for using them as per "
"https://xmpp.org/extensions/xep-0215.html"
"[XEP-0215: External Service Discovery]."),
opts =>
[{access,
#{value => ?T("AccessName"),
desc =>
?T("This option defines which access rule will be used to "
"control who is allowed to discover STUN/TURN services "
"and to request temporary credentials. The default value "
"is 'local'.")}},
{credentials_lifetime,
#{value => "timeout()",
desc =>
?T("The lifetime of temporary credentails offered to "
"clients. If a lifetime longer than the default value of "
"'10' minutes is specified, it's strongly recommended to "
"also specify a 'secret' (see below).")}},
{offer_local_services,
#{value => "true | false",
desc =>
?T("This option specifies whether local STUN/TURN services "
"configured as ejabberd listeners should be announced "
"automatically. Note that this will not include "
"TLS-enabled services, which must be configured manually "
"using the 'services' option (see below). For "
"non-anonymous TURN services, temporary credentials will "
"be offered to the client. The default value is "
"'true'.")}},
{secret,
#{value => ?T("Text"),
desc =>
?T("The secret used for generating temporary credentials. If "
"this option isn't specified, a secret will be "
"auto-generated. However, a secret must be specified if "
"non-anonymous TURN services running on other ejabberd "
"nodes and/or external TURN 'services' are configured. "
"Also note that auto-generated secrets are lost when the "
"node is restarted, which invalidates any credentials "
"offered before the restart. Therefore, the "
"'credentials_lifetime' should not exceed a few minutes "
"if no 'secret' is specified.")}},
{services,
#{value => "[Service, ...]",
example =>
["services:",
" -",
" host: 203.0.113.3",
" port: 3478",
" type: stun",
" transport: udp",
" restricted: false",
" -",
" host: 203.0.113.3",
" port: 3478",
" type: turn",
" transport: udp",
" restricted: true",
" -",
" host: 203.0.113.3",
" port: 3478",
" type: stun",
" transport: tcp",
" restricted: false",
" -",
" host: 203.0.113.3",
" port: 3478",
" type: turn",
" transport: tcp",
" restricted: true",
" -",
" host: server.example.com",
" port: 5349",
" type: stuns",
" transport: tcp",
" restricted: false",
" -",
" host: server.example.com",
" port: 5349",
" type: turns",
" transport: tcp",
" restricted: true"],
desc =>
?T("The list of services offered to clients. This list can "
"include STUN/TURN services running on any ejabberd node "
"and/or external services. However, if any listed TURN "
"service not running on the local ejabberd node requires "
"authentication, a 'secret' must be specified explicitly, "
"and must be shared with that service. This will only "
"work with ejabberd's built-in STUN/TURN server and with "
"external servers that support the same "
"https://tools.ietf.org/html/draft-uberti-behave-turn-rest-00"
"[REST API For Access To TURN Services]. Unless the "
"'offer_local_services' is set to 'false', the explicitly "
"listed services will be offered in addition to those "
"announced automatically.")},
[{host,
#{value => ?T("Host"),
desc =>
?T("The host name or IPv4 address the STUN/TURN service is "
"listening on. For non-TLS services, it's recommended "
"to specify an IPv4 address (to avoid additional DNS "
"lookup latency on the client side). For TLS services, "
"the host name (or possible IPv4 address) should match "
"the certificate. Specifying the 'host' option is "
"mandatory.")}},
{port,
#{value => "1..65535",
desc =>
?T("The port number the STUN/TURN service is listening "
"on. The default port number is 3478 for non-TLS "
"services and 5349 for TLS services.")}},
{type,
#{value => "stun | turn | stuns | turns",
desc =>
?T("The type of service. Must be 'stun' or 'turn' for "
"non-TLS services, 'stuns' or 'turns' for TLS services. "
"The default type is 'stun'.")}},
{transport,
#{value => "tcp | udp",
desc =>
?T("The transport protocol supported by the service. The "
"default is 'udp' for non-TLS services and 'tcp' for "
"TLS services.")}},
{restricted,
#{value => "true | false",
desc =>
?T("This option determines whether temporary credentials "
"for accessing the service are offered. The default is "
"'false' for STUN/STUNS services and 'true' for "
"TURN/TURNS services.")}}]}]}.
%%--------------------------------------------------------------------
%% gen_server callbacks.
%%--------------------------------------------------------------------
-spec init(list()) -> {ok, state()}.
init([Host, Opts]) ->
process_flag(trap_exit, true),
Services = get_configured_services(Opts),
Secret = get_configured_secret(Opts),
TTL = get_configured_ttl(Opts),
register_iq_handlers(Host),
register_hooks(Host),
{ok, #state{host = Host, services = Services, secret = Secret, ttl = TTL}}.
-spec handle_call(term(), {pid(), term()}, state())
-> {reply, {turn_disco, [service()] | binary()}, state()} |
{noreply, state()}.
handle_call({get_services, JID, #request{host = ReqHost,
port = ReqPort,
type = ReqType,
transport = ReqTrns,
restricted = ReqRstr}}, _From,
#state{host = Host,
services = List0,
secret = Secret,
ttl = TTL} = State) ->
?DEBUG("Getting STUN/TURN service list for ~ts", [jid:encode(JID)]),
Hash = <<(hash(jid:encode(JID)))/binary, (hash(Host))/binary>>,
List = lists:filtermap(
fun(#service{host = H, port = P, type = T, restricted = R})
when (ReqHost /= undefined) and (H /= ReqHost);
(ReqPort /= undefined) and (P /= ReqPort);
(ReqType /= undefined) and (T /= ReqType);
(ReqTrns /= undefined) and (T /= ReqTrns);
(ReqRstr /= undefined) and (R /= ReqRstr) ->
false;
(#service{restricted = false}) ->
true;
(#service{restricted = true} = Service) ->
{true, add_credentials(Service, Hash, Secret, TTL)}
end, List0),
?INFO_MSG("Offering STUN/TURN services to ~ts (~s)",
[jid:encode(JID), Hash]),
{reply, {turn_disco, List}, State};
handle_call({get_password, Username}, _From, #state{secret = Secret} = State) ->
?DEBUG("Getting STUN/TURN password for ~ts", [Username]),
Password = make_password(Username, Secret),
{reply, {turn_disco, Password}, State};
handle_call(Request, From, State) ->
?ERROR_MSG("Got unexpected request from ~p: ~p", [From, Request]),
{noreply, State}.
-spec handle_cast(term(), state()) -> {noreply, state()}.
handle_cast({reload, NewOpts, _OldOpts}, #state{host = Host} = State) ->
?DEBUG("Reloading STUN/TURN discovery configuration for ~ts", [Host]),
Services = get_configured_services(NewOpts),
Secret = get_configured_secret(NewOpts),
TTL = get_configured_ttl(NewOpts),
{noreply, State#state{services = Services, secret = Secret, ttl = TTL}};
handle_cast(Request, State) ->
?ERROR_MSG("Got unexpected request from: ~p", [Request]),
{noreply, State}.
-spec handle_info(term(), state()) -> {noreply, state()}.
handle_info(Info, State) ->
?ERROR_MSG("Got unexpected info: ~p", [Info]),
{noreply, State}.
-spec terminate(normal | shutdown | {shutdown, term()} | term(), state()) -> ok.
terminate(Reason, #state{host = Host}) ->
?DEBUG("Stopping STUN/TURN discovery process for ~ts: ~p",
[Host, Reason]),
unregister_hooks(Host),
unregister_iq_handlers(Host).
-spec code_change({down, term()} | term(), state(), term()) -> {ok, state()}.
code_change(_OldVsn, #state{host = Host} = State, _Extra) ->
?DEBUG("Updating STUN/TURN discovery process for ~ts", [Host]),
{ok, State}.
%%--------------------------------------------------------------------
%% Register/unregister hooks.
%%--------------------------------------------------------------------
-spec register_hooks(binary()) -> ok.
register_hooks(Host) ->
ejabberd_hooks:add(disco_local_features, Host, ?MODULE,
disco_local_features, 50),
ejabberd_hooks:add(stun_get_password, ?MODULE,
stun_get_password, 50).
-spec unregister_hooks(binary()) -> ok.
unregister_hooks(Host) ->
ejabberd_hooks:delete(disco_local_features, Host, ?MODULE,
disco_local_features, 50),
case gen_mod:is_loaded_elsewhere(Host, ?MODULE) of
false ->
ejabberd_hooks:delete(stun_get_password, ?MODULE,
stun_get_password, 50);
true ->
ok
end.
%%--------------------------------------------------------------------
%% Hook callbacks.
%%--------------------------------------------------------------------
-spec disco_local_features(mod_disco:features_acc(), jid(), jid(), binary(),
binary()) -> mod_disco:features_acc().
disco_local_features(empty, From, To, Node, Lang) ->
disco_local_features({result, []}, From, To, Node, Lang);
disco_local_features({result, OtherFeatures} = Acc, From,
#jid{lserver = LServer}, <<"">>, _Lang) ->
Access = mod_stun_disco_opt:access(LServer),
case acl:match_rule(LServer, Access, From) of
allow ->
?DEBUG("Announcing feature to ~ts", [jid:encode(From)]),
{result, [?NS_EXTDISCO_2 | OtherFeatures]};
deny ->
?DEBUG("Not announcing feature to ~ts", [jid:encode(From)]),
Acc
end;
disco_local_features(Acc, _From, _To, _Node, _Lang) ->
Acc.
-spec stun_get_password(any(), binary(), binary())
-> binary() | {stop, binary()}.
stun_get_password(<<>>, Username, _Realm) ->
case binary:split(Username, <<$:>>) of
[Expiration, <<_UserHash:8/binary, HostHash:8/binary>>] ->
try binary_to_integer(Expiration) of
ExpireTime ->
case erlang:system_time(second) of
Now when Now < ExpireTime ->
?DEBUG("Looking up password for: ~ts", [Username]),
{stop, get_password(Username, HostHash)};
Now when Now >= ExpireTime ->
?INFO_MSG("Credentials expired: ~ts", [Username]),
{stop, <<>>}
end
catch _:badarg ->
?DEBUG("Non-numeric expiration field: ~ts", [Username]),
<<>>
end;
_ ->
?DEBUG("Not an ephemeral username: ~ts", [Username]),
<<>>
end;
stun_get_password(Acc, _Username, _Realm) ->
Acc.
%%--------------------------------------------------------------------
%% IQ handlers.
%%--------------------------------------------------------------------
-spec register_iq_handlers(binary()) -> ok.
register_iq_handlers(Host) ->
gen_iq_handler:add_iq_handler(ejabberd_local, Host,
?NS_EXTDISCO_2, ?MODULE, process_iq).
-spec unregister_iq_handlers(binary()) -> ok.
unregister_iq_handlers(Host) ->
gen_iq_handler:remove_iq_handler(ejabberd_local, Host, ?NS_EXTDISCO_2).
-spec process_iq(iq()) -> iq().
process_iq(#iq{type = get,
sub_els = [#services{type = ReqType}]} = IQ) ->
Request = #request{type = ReqType},
process_iq_get(IQ, Request);
process_iq(#iq{type = get,
sub_els = [#credentials{
services = [#service{
host = ReqHost,
port = ReqPort,
type = ReqType,
transport = ReqTrns,
name = <<>>,
username = <<>>,
password = <<>>,
expires = undefined,
restricted = undefined,
action = undefined,
xdata = undefined}]}]} = IQ) ->
% Accepting the 'transport' request attribute is an ejabberd extension.
Request = #request{host = ReqHost,
port = ReqPort,
type = ReqType,
transport = ReqTrns,
restricted = true},
process_iq_get(IQ, Request);
process_iq(#iq{type = set, lang = Lang} = IQ) ->
Txt = ?T("Value 'set' of 'type' attribute is not allowed"),
xmpp:make_error(IQ, xmpp:err_not_allowed(Txt, Lang));
process_iq(#iq{lang = Lang} = IQ) ->
Txt = ?T("No module is handling this query"),
xmpp:make_error(IQ, xmpp:err_service_unavailable(Txt, Lang)).
-spec process_iq_get(iq(), request()) -> iq().
process_iq_get(#iq{from = From, to = #jid{lserver = Host}, lang = Lang} = IQ,
Request) ->
Access = mod_stun_disco_opt:access(Host),
case acl:match_rule(Host, Access, From) of
allow ->
?DEBUG("Performing external service discovery for ~ts",
[jid:encode(From)]),
case get_services(Host, From, Request) of
{ok, Services} ->
xmpp:make_iq_result(IQ, #services{list = Services});
{error, timeout} -> % Has been logged already.
Txt = ?T("Service list retrieval timed out"),
Err = xmpp:err_internal_server_error(Txt, Lang),
xmpp:make_error(IQ, Err)
end;
deny ->
?DEBUG("Won't perform external service discovery for ~ts",
[jid:encode(From)]),
Txt = ?T("Access denied by service policy"),
xmpp:make_error(IQ, xmpp:err_forbidden(Txt, Lang))
end.
%%--------------------------------------------------------------------
%% Internal functions.
%%--------------------------------------------------------------------
-spec get_configured_services(gen_mod:opts()) -> [service()].
get_configured_services(Opts) ->
LocalServices = case mod_stun_disco_opt:offer_local_services(Opts) of
true ->
?DEBUG("Discovering local services", []),
find_local_services();
false ->
?DEBUG("Won't discover local services", []),
[]
end,
dedup(LocalServices ++ mod_stun_disco_opt:services(Opts)).
-spec get_configured_secret(gen_mod:opts()) -> binary().
get_configured_secret(Opts) ->
case mod_stun_disco_opt:secret(Opts) of
undefined ->
?DEBUG("Auto-generating secret", []),
new_secret();
Secret ->
?DEBUG("Using configured secret", []),
Secret
end.
-spec get_configured_ttl(gen_mod:opts()) -> non_neg_integer().
get_configured_ttl(Opts) ->
mod_stun_disco_opt:credentials_lifetime(Opts) div 1000.
-spec new_secret() -> binary().
new_secret() ->
p1_rand:bytes(20).
-spec add_credentials(service(), binary(), binary(), non_neg_integer())
-> service().
add_credentials(Service, Hash, Secret, TTL) ->
ExpireAt = erlang:system_time(second) + TTL,
Username = make_username(ExpireAt, Hash),
Password = make_password(Username, Secret),
?DEBUG("Created ephemeral credentials: ~s | ~s", [Username, Password]),
Service#service{username = Username,
password = Password,
expires = seconds_to_timestamp(ExpireAt)}.
-spec make_username(non_neg_integer(), binary()) -> binary().
make_username(ExpireAt, Hash) ->
<<(integer_to_binary(ExpireAt))/binary, $:, Hash/binary>>.
-spec make_password(binary(), binary()) -> binary().
make_password(Username, Secret) ->
base64:encode(crypto:hmac(sha, Secret, Username)).
-spec get_password(binary(), binary()) -> binary().
get_password(Username, HostHash) ->
try call({hash, HostHash}, {get_password, Username}) of
{turn_disco, Password} ->
Password
catch
exit:{timeout, _} ->
?ERROR_MSG("Asking ~ts for password timed out", [HostHash]),
<<>>;
exit:{noproc, _} -> % Can be triggered by bogus Username.
?DEBUG("Cannot retrieve password for ~ts", [Username]),
<<>>
end.
-spec get_services(binary(), jid(), request())
-> {ok, [service()]} | {error, timeout}.
get_services(Host, JID, Request) ->
try call(Host, {get_services, JID, Request}) of
{turn_disco, Services} ->
{ok, Services}
catch
exit:{timeout, _} ->
?ERROR_MSG("Asking ~ts for services timed out", [Host]),
{error, timeout}
end.
-spec find_local_services() -> [service()].
find_local_services() ->
ParseListener = fun(Listener) -> parse_listener(Listener) end,
lists:flatmap(ParseListener, ejabberd_option:listen()).
-spec parse_listener(ejabberd_listener:listener()) -> [service()].
parse_listener({_EndPoint, ?STUN_MODULE, #{tls := true}}) ->
?DEBUG("Ignoring TLS-enabled STUN/TURN listener", []),
[]; % Avoid certificate hostname issues.
parse_listener({{Port, _Addr, Transport}, ?STUN_MODULE, Opts}) ->
case get_listener_ip(Opts) of
{127, _, _, _} = Addr ->
?INFO_MSG("Won't auto-announce STUN/TURN service with loopback "
"address: ~s:~B (~s), please specify a public 'turn_ip'",
[misc:ip_to_list(Addr), Port, Transport]),
[];
Addr ->
StunService = #service{host = Addr,
port = Port,
transport = Transport,
restricted = false,
type = stun},
case Opts of
#{use_turn := true} ->
?DEBUG("Found STUN/TURN listener: ~s:~B (~s)",
[misc:ip_to_list(Addr), Port, Transport]),
[StunService, #service{host = Addr,
port = Port,
transport = Transport,
restricted = is_restricted(Opts),
type = turn}];
#{use_turn := false} ->
?DEBUG("Found STUN listener: ~s:~B (~s)",
[misc:ip_to_list(Addr), Port, Transport]),
[StunService]
end
end;
parse_listener({_EndPoint, Module, _Opts}) ->
?DEBUG("Ignoring ~s listener", [Module]),
[].
-spec get_listener_ip(map()) -> inet:ip_address().
get_listener_ip(#{ip := { 0, 0, 0, 0}} = Opts) -> get_turn_ip(Opts);
get_listener_ip(#{ip := {127, _, _, _}} = Opts) -> get_turn_ip(Opts);
get_listener_ip(#{ip := { 10, _, _, _}} = Opts) -> get_turn_ip(Opts);
get_listener_ip(#{ip := {172, 16, _, _}} = Opts) -> get_turn_ip(Opts);
get_listener_ip(#{ip := {192, 168, _, _}} = Opts) -> get_turn_ip(Opts);
get_listener_ip(#{ip := IP}) -> IP.
-spec get_turn_ip(map()) -> inet:ip_address().
get_turn_ip(#{turn_ip := {_, _, _, _} = TurnIP}) -> TurnIP;
get_turn_ip(#{turn_ip := undefined}) -> misc:get_my_ip().
-spec is_restricted(map()) -> boolean().
is_restricted(#{auth_type := user}) -> true;
is_restricted(#{auth_type := anonymous}) -> false.
-spec call(host_or_hash(), term()) -> term().
call(Host, Request) ->
Proc = get_proc_name(Host),
gen_server:call(Proc, Request, timer:seconds(15)).
-spec cast(host_or_hash(), term()) -> ok.
cast(Host, Request) ->
Proc = get_proc_name(Host),
gen_server:cast(Proc, Request).
-spec get_proc_name(host_or_hash()) -> atom().
get_proc_name(Host) when is_binary(Host) ->
get_proc_name({hash, hash(Host)});
get_proc_name({hash, HostHash}) ->
gen_mod:get_module_proc(HostHash, ?MODULE).
-spec hash(binary()) -> binary().
hash(Host) ->
str:to_hexlist(binary_part(crypto:hash(sha, Host), 0, 4)).
-spec dedup(list()) -> list().
dedup([]) -> [];
dedup([H | T]) -> [H | [E || E <- dedup(T), E /= H]].
-spec seconds_to_timestamp(non_neg_integer()) -> erlang:timestamp().
seconds_to_timestamp(Seconds) ->
{Seconds div 1000000, Seconds rem 1000000, 0}.

41
src/mod_stun_disco_opt.erl Normal file
View File

@ -0,0 +1,41 @@
%% Generated automatically
%% DO NOT EDIT: run `make options` instead
-module(mod_stun_disco_opt).
-export([access/1]).
-export([credentials_lifetime/1]).
-export([offer_local_services/1]).
-export([secret/1]).
-export([services/1]).
-spec access(gen_mod:opts() | global | binary()) -> 'local' | acl:acl().
access(Opts) when is_map(Opts) ->
gen_mod:get_opt(access, Opts);
access(Host) ->
gen_mod:get_module_opt(Host, mod_stun_disco, access).
-spec credentials_lifetime(gen_mod:opts() | global | binary()) -> pos_integer().
credentials_lifetime(Opts) when is_map(Opts) ->
gen_mod:get_opt(credentials_lifetime, Opts);
credentials_lifetime(Host) ->
gen_mod:get_module_opt(Host, mod_stun_disco, credentials_lifetime).
-spec offer_local_services(gen_mod:opts() | global | binary()) -> boolean().
offer_local_services(Opts) when is_map(Opts) ->
gen_mod:get_opt(offer_local_services, Opts);
offer_local_services(Host) ->
gen_mod:get_module_opt(Host, mod_stun_disco, offer_local_services).
-spec secret(gen_mod:opts() | global | binary()) -> 'undefined' | binary().
secret(Opts) when is_map(Opts) ->
gen_mod:get_opt(secret, Opts);
secret(Host) ->
gen_mod:get_module_opt(Host, mod_stun_disco, secret).
-spec services(gen_mod:opts() | global | binary()) -> [tuple()].
services(Opts) when is_map(Opts) ->
gen_mod:get_opt(services, Opts);
services(Host) ->
gen_mod:get_module_opt(Host, mod_stun_disco, services).

1
test/ejabberd_SUITE.erl
View File

@ -361,6 +361,7 @@ no_db_tests() ->
muc_tests:master_slave_cases(),
proxy65_tests:single_cases(),
proxy65_tests:master_slave_cases(),
stundisco_tests:single_cases(),
replaced_tests:master_slave_cases(),
upload_tests:single_cases(),
carbons_tests:single_cases(),

12
test/ejabberd_SUITE_data/ejabberd.yml
View File

@ -90,6 +90,12 @@ listen:
"/api": mod_http_api
"/upload": mod_http_upload
"/captcha": ejabberd_captcha
-
port: STUN_PORT
module: ejabberd_stun
transport: udp
use_turn: true
turn_ip: "203.0.113.3"
-
port: COMPONENT_PORT
module: ejabberd_service
@ -124,6 +130,12 @@ Welcome to this XMPP server."
mod_stream_mgmt:
max_ack_queue: 10
resume_timeout: 3
mod_stun_disco:
secret: "cryptic"
services:
-
host: "example.com"
type: turns
mod_time: []
mod_version: []
mod_http_upload:

1
test/ejabberd_SUITE_data/macros.yml
View File

@ -4,6 +4,7 @@ define_macro:
C2S_PORT: @@c2s_port@@
S2S_PORT: @@s2s_port@@
WEB_PORT: @@web_port@@
STUN_PORT: @@stun_port@@
COMPONENT_PORT: @@component_port@@
PROXY_PORT: @@proxy_port@@
PASSWORD: >-

192
test/stundisco_tests.erl Normal file
View File

@ -0,0 +1,192 @@
%%%-------------------------------------------------------------------
%%% Author : Holger Weiss <holger@zedat.fu-berlin.de>
%%% Created : 22 Apr 2020 by Holger Weiss <holger@zedat.fu-berlin.de>
%%%
%%%
%%% ejabberd, Copyright (C) 2020 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(stundisco_tests).
%% API
-compile(export_all).
-import(suite, [send_recv/2, disconnect/1, is_feature_advertised/2,
server_jid/1]).
-include("suite.hrl").
%%%===================================================================
%%% API
%%%===================================================================
%%%===================================================================
%%% Single user tests
%%%===================================================================
single_cases() ->
{stundisco_single, [sequence],
[single_test(feature_enabled),
single_test(stun_service),
single_test(turn_service),
single_test(turns_service),
single_test(turn_credentials),
single_test(turns_credentials)]}.
feature_enabled(Config) ->
true = is_feature_advertised(Config, ?NS_EXTDISCO_2),
disconnect(Config).
stun_service(Config) ->
ServerJID = server_jid(Config),
Host = {203, 0, 113, 3},
Port = ct:get_config(stun_port, 3478),
Type = stun,
Transport = udp,
Request = #services{type = Type},
#iq{type = result,
sub_els = [#services{
type = undefined,
list = [#service{host = Host,
port = Port,
type = Type,
transport = Transport,
restricted = false,
username = <<>>,
password = <<>>,
expires = undefined,
action = undefined,
xdata = undefined}]}]} =
send_recv(Config, #iq{type = get, to = ServerJID, sub_els = [Request]}),
disconnect(Config).
turn_service(Config) ->
ServerJID = server_jid(Config),
Host = {203, 0, 113, 3},
Port = ct:get_config(stun_port, 3478),
Type = turn,
Transport = udp,
Request = #services{type = Type},
#iq{type = result,
sub_els = [#services{
type = undefined,
list = [#service{host = Host,
port = Port,
type = Type,
transport = Transport,
restricted = true,
username = Username,
password = Password,
expires = Expires,
action = undefined,
xdata = undefined}]}]} =
send_recv(Config, #iq{type = get, to = ServerJID, sub_els = [Request]}),
true = check_password(Username, Password),
true = check_expires(Expires),
disconnect(Config).
turns_service(Config) ->
ServerJID = server_jid(Config),
Host = <<"example.com">>,
Port = 5349,
Type = turns,
Transport = tcp,
Request = #services{type = Type},
#iq{type = result,
sub_els = [#services{
type = undefined,
list = [#service{host = Host,
port = Port,
type = Type,
transport = Transport,
restricted = true,
username = Username,
password = Password,
expires = Expires,
action = undefined,
xdata = undefined}]}]} =
send_recv(Config, #iq{type = get, to = ServerJID, sub_els = [Request]}),
true = check_password(Username, Password),
true = check_expires(Expires),
disconnect(Config).
turn_credentials(Config) ->
ServerJID = server_jid(Config),
Host = {203, 0, 113, 3},
Port = ct:get_config(stun_port, 3478),
Type = turn,
Transport = udp,
Request = #credentials{services = [#service{host = Host,
port = Port,
type = Type}]},
#iq{type = result,
sub_els = [#services{
type = undefined,
list = [#service{host = Host,
port = Port,
type = Type,
transport = Transport,
restricted = true,
username = Username,
password = Password,
expires = Expires,
action = undefined,
xdata = undefined}]}]} =
send_recv(Config, #iq{type = get, to = ServerJID, sub_els = [Request]}),
true = check_password(Username, Password),
true = check_expires(Expires),
disconnect(Config).
turns_credentials(Config) ->
ServerJID = server_jid(Config),
Host = <<"example.com">>,
Port = 5349,
Type = turns,
Transport = tcp,
Request = #credentials{services = [#service{host = Host,
port = Port,
type = Type}]},
#iq{type = result,
sub_els = [#services{
type = undefined,
list = [#service{host = Host,
port = Port,
type = Type,
transport = Transport,
restricted = true,
username = Username,
password = Password,
expires = Expires,
action = undefined,
xdata = undefined}]}]} =
send_recv(Config, #iq{type = get, to = ServerJID, sub_els = [Request]}),
true = check_password(Username, Password),
true = check_expires(Expires),
disconnect(Config).
%%%===================================================================
%%% Internal functions
%%%===================================================================
single_test(T) ->
list_to_atom("stundisco_" ++ atom_to_list(T)).
check_password(Username, Password) ->
Secret = <<"cryptic">>,
Password == base64:encode(crypto:hmac(sha, Secret, Username)).
check_expires({_, _, _} = Expires) ->
Now = {MegaSecs, Secs, MicroSecs} = erlang:timestamp(),
Later = {MegaSecs + 1, Secs, MicroSecs},
(Expires > Now) and (Expires < Later).

1
test/suite.erl
View File

@ -60,6 +60,7 @@ init_config(Config) ->
{loglevel, 4},
{new_schema, false},
{s2s_port, 5269},
{stun_port, 3478},
{component_port, 5270},
{web_port, 5280},
{proxy_port, 7777},