95 lines
3.1 KiB
Erlang
95 lines
3.1 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : cyrsasl_plain.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : PLAIN SASL mechanism
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%%% Created : 8 Mar 2003 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2018 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%----------------------------------------------------------------------
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-module(cyrsasl_plain).
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-author('alexey@process-one.net').
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-export([start/1, stop/0, mech_new/4, mech_step/2, parse/1, format_error/1]).
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-behaviour(cyrsasl).
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-record(state, {check_password}).
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-type error_reason() :: parser_failed | not_authorized.
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-export_type([error_reason/0]).
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start(_Opts) ->
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cyrsasl:register_mechanism(<<"PLAIN">>, ?MODULE, plain).
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stop() -> ok.
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-spec format_error(error_reason()) -> {atom(), binary()}.
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format_error(parser_failed) ->
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{'bad-protocol', <<"Response decoding failed">>};
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format_error(not_authorized) ->
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{'not-authorized', <<"Invalid username or password">>}.
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mech_new(_Host, _GetPassword, CheckPassword, _CheckPasswordDigest) ->
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{ok, #state{check_password = CheckPassword}}.
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mech_step(State, ClientIn) ->
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case prepare(ClientIn) of
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[AuthzId, User, Password] ->
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case (State#state.check_password)(User, AuthzId, Password) of
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{true, AuthModule} ->
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{ok,
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[{username, User}, {authzid, AuthzId},
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{auth_module, AuthModule}]};
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_ -> {error, not_authorized, User}
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end;
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_ -> {error, parser_failed}
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end.
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prepare(ClientIn) ->
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case parse(ClientIn) of
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[<<"">>, UserMaybeDomain, Password] ->
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case parse_domain(UserMaybeDomain) of
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%% <NUL>login@domain<NUL>pwd
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[User, _Domain] -> [User, User, Password];
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%% <NUL>login<NUL>pwd
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[User] -> [User, User, Password]
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end;
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[AuthzId, User, Password] ->
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case parse_domain(AuthzId) of
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%% login@domain<NUL>login<NUL>pwd
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[AuthzUser, _Domain] -> [AuthzUser, User, Password];
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%% login<NUL>login<NUL>pwd
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[AuthzUser] -> [AuthzUser, User, Password]
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end;
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_ -> error
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end.
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parse(S) ->
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binary:split(S, <<0>>, [global]).
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parse_domain(S) -> parse_domain1(binary_to_list(S), "", []).
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parse_domain1([$@ | Cs], S, T) ->
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parse_domain1(Cs, "", [list_to_binary(lists:reverse(S)) | T]);
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parse_domain1([C | Cs], S, T) ->
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parse_domain1(Cs, [C | S], T);
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parse_domain1([], S, T) ->
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lists:reverse([list_to_binary(lists:reverse(S)) | T]).
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