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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_access_control).
-include("rabbit.hrl").
-export([check_user_pass_login/2, check_user_login/2, check_user_loopback/2,
check_vhost_access/3, check_resource_access/3]).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-export_type([permission_atom/0]).
-type(permission_atom() :: 'configure' | 'read' | 'write').
-spec(check_user_pass_login/2 ::
(rabbit_types:username(), rabbit_types:password())
-> {'ok', rabbit_types:user()} |
{'refused', rabbit_types:username(), string(), [any()]}).
-spec(check_user_login/2 ::
(rabbit_types:username(), [{atom(), any()}])
-> {'ok', rabbit_types:user()} |
{'refused', rabbit_types:username(), string(), [any()]}).
-spec(check_user_loopback/2 :: (rabbit_types:username(),
rabbit_net:socket() | inet:ip_address())
-> 'ok' | 'not_allowed').
-spec(check_vhost_access/3 ::
(rabbit_types:user(), rabbit_types:vhost(), rabbit_net:socket())
-> 'ok' | rabbit_types:channel_exit()).
-spec(check_resource_access/3 ::
(rabbit_types:user(), rabbit_types:r(atom()), permission_atom())
-> 'ok' | rabbit_types:channel_exit()).
-endif.
%%----------------------------------------------------------------------------
check_user_pass_login(Username, Password) ->
check_user_login(Username, [{password, Password}]).
check_user_login(Username, AuthProps) ->
{ok, Modules} = application:get_env(rabbit, auth_backends),
R = lists:foldl(
fun ({ModN, ModZs0}, {refused, _, _, _}) ->
ModZs = case ModZs0 of
A when is_atom(A) -> [A];
L when is_list(L) -> L
end,
%% Different modules for authN vs authZ. So authenticate
%% with authN module, then if that succeeds do
%% passwordless (i.e pre-authenticated) login with authZ.
case try_authenticate(ModN, Username, AuthProps) of
{ok, ModNUser = #auth_user{username = Username2}} ->
user(ModNUser, try_authorize(ModZs, Username2));
Else ->
Else
end;
(Mod, {refused, _, _, _}) ->
%% Same module for authN and authZ. Just take the result
%% it gives us
case try_authenticate(Mod, Username, AuthProps) of
{ok, ModNUser = #auth_user{impl = Impl}} ->
user(ModNUser, {ok, [{Mod, Impl}]});
Else ->
Else
end;
(_, {ok, User}) ->
%% We've successfully authenticated. Skip to the end...
{ok, User}
end,
{refused, Username, "No modules checked '~s'", [Username]}, Modules),
R.
try_authenticate(Module, Username, AuthProps) ->
case Module:user_login_authentication(Username, AuthProps) of
{ok, AuthUser} -> {ok, AuthUser};
{error, E} -> {refused, Username,
"~s failed authenticating ~s: ~p~n",
[Module, Username, E]};
{refused, F, A} -> {refused, Username, F, A}
end.
try_authorize(Modules, Username) ->
lists:foldr(
fun (Module, {ok, ModsImpls}) ->
case Module:user_login_authorization(Username) of
{ok, Impl} -> {ok, [{Module, Impl} | ModsImpls]};
{error, E} -> {refused, Username,
"~s failed authorizing ~s: ~p~n",
[Module, Username, E]};
{refused, F, A} -> {refused, Username, F, A}
end;
(_, {refused, F, A}) ->
{refused, Username, F, A}
end, {ok, []}, Modules).
user(#auth_user{username = Username, tags = Tags}, {ok, ModZImpls}) ->
{ok, #user{username = Username,
tags = Tags,
authz_backends = ModZImpls}};
user(_AuthUser, Error) ->
Error.
auth_user(#user{username = Username, tags = Tags}, Impl) ->
#auth_user{username = Username,
tags = Tags,
impl = Impl}.
check_user_loopback(Username, SockOrAddr) ->
{ok, Users} = application:get_env(rabbit, loopback_users),
case rabbit_net:is_loopback(SockOrAddr)
orelse not lists:member(Username, Users) of
true -> ok;
false -> not_allowed
end.
check_vhost_access(User = #user{username = Username,
authz_backends = Modules}, VHostPath, Sock) ->
lists:foldl(
fun({Mod, Impl}, ok) ->
check_access(
fun() ->
rabbit_vhost:exists(VHostPath) andalso
Mod:check_vhost_access(
auth_user(User, Impl), VHostPath, Sock)
end,
Mod, "access to vhost '~s' refused for user '~s'",
[VHostPath, Username]);
(_, Else) ->
Else
end, ok, Modules).
check_resource_access(User, R = #resource{kind = exchange, name = <<"">>},
Permission) ->
check_resource_access(User, R#resource{name = <<"amq.default">>},
Permission);
check_resource_access(User = #user{username = Username,
authz_backends = Modules},
Resource, Permission) ->
lists:foldl(
fun({Module, Impl}, ok) ->
check_access(
fun() -> Module:check_resource_access(
auth_user(User, Impl), Resource, Permission) end,
Module, "access to ~s refused for user '~s'",
[rabbit_misc:rs(Resource), Username]);
(_, Else) -> Else
end, ok, Modules).
check_access(Fun, Module, ErrStr, ErrArgs) ->
Allow = case Fun() of
{error, E} ->
rabbit_log:error(ErrStr ++ " by ~s: ~p~n",
ErrArgs ++ [Module, E]),
false;
Else ->
Else
end,
case Allow of
true ->
ok;
false ->
rabbit_misc:protocol_error(access_refused, ErrStr, ErrArgs)
end.
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