%%%----------------------------------------------------------------------
%%% File : cyrsasl.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose : Cyrus SASL-like library
%%% Created : 8 Mar 2003 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(cyrsasl).
-author('alexey@sevcom.net').
-vsn('$Revision$ ').
-export([start/0,
register_mechanism/3,
listmech/1,
server_new/6,
server_start/3,
server_step/2]).
-record(sasl_mechanism, {mechanism, module, require_plain_password}).
-record(sasl_state, {service, myname, realm,
get_password, check_password,
mech_mod, mech_state}).
-export([behaviour_info/1]).
behaviour_info(callbacks) ->
[{mech_new, 3}, {mech_step, 2}];
behaviour_info(Other) ->
undefined.
start() ->
ets:new(sasl_mechanism, [named_table,
public,
{keypos, #sasl_mechanism.mechanism}]),
cyrsasl_plain:start([]),
cyrsasl_digest:start([]),
cyrsasl_anonymous:start([]),
ok.
register_mechanism(Mechanism, Module, RequirePlainPassword) ->
ets:insert(sasl_mechanism,
#sasl_mechanism{mechanism = Mechanism,
module = Module,
require_plain_password = RequirePlainPassword}).
% TODO: use callbacks
-include("ejabberd.hrl").
-include("jlib.hrl").
check_authzid(State, Props) ->
AuthzId = xml:get_attr_s(authzid, Props),
case jlib:string_to_jid(AuthzId) of
error ->
{error, "invalid-authzid"};
JID ->
LUser = jlib:nodeprep(xml:get_attr_s(username, Props)),
{U, S, R} = jlib:jid_tolower(JID),
case R of
"" ->
{error, "invalid-authzid"};
_ ->
case {LUser, ?MYNAME} of
{U, S} ->
ok;
_ ->
{error, "invalid-authzid"}
end
end
end.
check_credentials(State, Props) ->
User = xml:get_attr_s(username, Props),
case jlib:nodeprep(User) of
error ->
{error, "not-authorized"};
"" ->
{error, "not-authorized"};
LUser ->
ok
end.
listmech(Host) ->
RequirePlainPassword = ejabberd_auth:plain_password_required(Host),
Mechs = ets:select(sasl_mechanism,
[{#sasl_mechanism{mechanism = '$1',
require_plain_password = '$2',
_ = '_'},
if
RequirePlainPassword ->
[{'==', '$2', false}];
true ->
[]
end,
['$1']}]),
filter_anonymous(Host, Mechs).
server_new(Service, ServerFQDN, UserRealm, SecFlags,
GetPassword, CheckPassword) ->
#sasl_state{service = Service,
myname = ServerFQDN,
realm = UserRealm,
get_password = GetPassword,
check_password = CheckPassword}.
server_start(State, Mech, ClientIn) ->
case lists:member(Mech, listmech(State#sasl_state.myname)) of
true ->
case ets:lookup(sasl_mechanism, Mech) of
[#sasl_mechanism{module = Module}] ->
{ok, MechState} = Module:mech_new(
State#sasl_state.myname,
State#sasl_state.get_password,
State#sasl_state.check_password),
server_step(State#sasl_state{mech_mod = Module,
mech_state = MechState},
ClientIn);
_ ->
{error, "no-mechanism"}
end;
false ->
{error, "no-mechanism"}
end.
server_step(State, ClientIn) ->
Module = State#sasl_state.mech_mod,
MechState = State#sasl_state.mech_state,
case Module:mech_step(MechState, ClientIn) of
{ok, Props} ->
case check_credentials(State, Props) of
ok ->
{ok, Props};
{error, Error} ->
{error, Error}
end;
{continue, ServerOut, NewMechState} ->
{continue, ServerOut,
State#sasl_state{mech_state = NewMechState}};
{error, Error} ->
{error, Error}
end.
%% Remove the anonymous mechanism from the list if not enabled for the given
%% host
filter_anonymous(Host, Mechs) ->
case ejabberd_auth_anonymous:is_sasl_anonymous_enabled(Host) of
true -> Mechs;
false -> Mechs -- ["ANONYMOUS"]
end.
