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%%%----------------------------------------------------------------------
%%% File : cyrsasl_plain.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : PLAIN SASL mechanism
%%% Created : 8 Mar 2003 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2012 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., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%----------------------------------------------------------------------
-module(cyrsasl_plain).
-author('alexey@process-one.net').
-export([start/1, stop/0, mech_new/4, mech_step/2, parse/1]).
-behaviour(cyrsasl).
-record(state, {check_password}).
start(_Opts) ->
cyrsasl:register_mechanism("PLAIN", ?MODULE, plain),
ok.
stop() ->
ok.
mech_new(_Host, _GetPassword, CheckPassword, _CheckPasswordDigest) ->
{ok, #state{check_password = CheckPassword}}.
mech_step(State, ClientIn) ->
case prepare(ClientIn) of
[AuthzId, User, Password] ->
case (State#state.check_password)(User, Password) of
{true, AuthModule} ->
{ok, [{username, User}, {authzid, AuthzId},
{auth_module, AuthModule}]};
_ ->
{error, "not-authorized", User}
end;
_ ->
{error, "bad-protocol"}
end.
prepare(ClientIn) ->
case parse(ClientIn) of
[[], UserMaybeDomain, Password] ->
case parse_domain(UserMaybeDomain) of
%% <NUL>login@domain<NUL>pwd
[User, _Domain] ->
[UserMaybeDomain, User, Password];
%% <NUL>login<NUL>pwd
[User] ->
["", User, Password]
end;
%% login@domain<NUL>login<NUL>pwd
[AuthzId, User, Password] ->
[AuthzId, User, Password];
_ ->
error
end.
parse(S) ->
parse1(S, "", []).
parse1([0 | Cs], S, T) ->
parse1(Cs, "", [lists:reverse(S) | T]);
parse1([C | Cs], S, T) ->
parse1(Cs, [C | S], T);
%parse1([], [], T) ->
% lists:reverse(T);
parse1([], S, T) ->
lists:reverse([lists:reverse(S) | T]).
parse_domain(S) ->
parse_domain1(S, "", []).
parse_domain1([$@ | Cs], S, T) ->
parse_domain1(Cs, "", [lists:reverse(S) | T]);
parse_domain1([C | Cs], S, T) ->
parse_domain1(Cs, [C | S], T);
parse_domain1([], S, T) ->
lists:reverse([lists:reverse(S) | T]).
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