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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (the "License"); you may not use this file except in
%% compliance with the License. You may obtain a copy of the License
%% at http://www.mozilla.org/MPL/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and
%% limitations under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developer of the Original Code is GoPivotal, Inc.
%% Copyright (c) 2007-2014 GoPivotal, Inc. All rights reserved.
%%
-module(rabbit_auth_mechanism_plain).
-include("rabbit.hrl").
-behaviour(rabbit_auth_mechanism).
-export([description/0, should_offer/1, init/1, handle_response/2]).
-rabbit_boot_step({?MODULE,
[{description, "auth mechanism plain"},
{mfa, {rabbit_registry, register,
[auth_mechanism, <<"PLAIN">>, ?MODULE]}},
{requires, rabbit_registry},
{enables, kernel_ready}]}).
%% SASL PLAIN, as used by the Qpid Java client and our clients. Also,
%% apparently, by OpenAMQ.
%% TODO: reimplement this using the binary module? - that makes use of
%% BIFs to do binary matching and will thus be much faster.
description() ->
[{description, <<"SASL PLAIN authentication mechanism">>}].
should_offer(_Sock) ->
true.
init(_Sock) ->
[].
handle_response(Response, _State) ->
case extract_user_pass(Response) of
{ok, User, Pass} ->
rabbit_access_control:check_user_pass_login(User, Pass);
error ->
{protocol_error, "response ~p invalid", [Response]}
end.
extract_user_pass(Response) ->
case extract_elem(Response) of
{ok, User, Response1} -> case extract_elem(Response1) of
{ok, Pass, <<>>} -> {ok, User, Pass};
_ -> error
end;
error -> error
end.
extract_elem(<<0:8, Rest/binary>>) ->
Count = next_null_pos(Rest, 0),
<<Elem:Count/binary, Rest1/binary>> = Rest,
{ok, Elem, Rest1};
extract_elem(_) ->
error.
next_null_pos(<<>>, Count) -> Count;
next_null_pos(<<0:8, _Rest/binary>>, Count) -> Count;
next_null_pos(<<_:8, Rest/binary>>, Count) -> next_null_pos(Rest, Count + 1).
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