Chapril/xmpp.chapril.org-ejabberd
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xmpp.chapril.org-ejabberd/src/ejabberd_auth_internal.erl
badlop 285c4c17cf Merge pull request #146 from jamielinux/master 
Update FSF address
2014-04-11 13:35:46 +02:00

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%%%----------------------------------------------------------------------
%%% File : ejabberd_auth_internal.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Authentification via mnesia
%%% Created : 12 Dec 2004 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2014 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.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%----------------------------------------------------------------------
-module(ejabberd_auth_internal).
-author('alexey@process-one.net').
-behaviour(ejabberd_auth).
%% External exports
-export([start/1, set_password/3, check_password/3,
check_password/5, try_register/3,
dirty_get_registered_users/0, get_vh_registered_users/1,
get_vh_registered_users/2,
get_vh_registered_users_number/1,
get_vh_registered_users_number/2, get_password/2,
get_password_s/2, is_user_exists/2, remove_user/2,
remove_user/3, store_type/0, export/1, import/1,
import/3, plain_password_required/0]).
-include("ejabberd.hrl").
-include("logger.hrl").
-record(passwd, {us = {<<"">>, <<"">>} :: {binary(), binary()} | '$1',
password = <<"">> :: binary() | scram() | '_'}).
-record(reg_users_counter, {vhost = <<"">> :: binary(),
count = 0 :: integer() | '$1'}).
-define(SALT_LENGTH, 16).
%%%----------------------------------------------------------------------
%%% API
%%%----------------------------------------------------------------------
start(Host) ->
mnesia:create_table(passwd,
[{disc_copies, [node()]},
{attributes, record_info(fields, passwd)}]),
mnesia:create_table(reg_users_counter,
[{ram_copies, [node()]},
{attributes, record_info(fields, reg_users_counter)}]),
update_table(),
update_reg_users_counter_table(Host),
maybe_alert_password_scrammed_without_option(),
ok.
update_reg_users_counter_table(Server) ->
Set = get_vh_registered_users(Server),
Size = length(Set),
LServer = jlib:nameprep(Server),
F = fun () ->
mnesia:write(#reg_users_counter{vhost = LServer,
count = Size})
end,
mnesia:sync_dirty(F).
plain_password_required() ->
case is_scrammed() of
false -> false;
true -> true
end.
store_type() ->
case is_scrammed() of
false -> plain; %% allows: PLAIN DIGEST-MD5 SCRAM
true -> scram %% allows: PLAIN SCRAM
end.
check_password(User, Server, Password) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
US = {LUser, LServer},
case catch mnesia:dirty_read({passwd, US}) of
[#passwd{password = Password}]
when is_binary(Password) ->
Password /= <<"">>;
[#passwd{password = Scram}]
when is_record(Scram, scram) ->
is_password_scram_valid(Password, Scram);
_ -> false
end.
check_password(User, Server, Password, Digest,
DigestGen) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
US = {LUser, LServer},
case catch mnesia:dirty_read({passwd, US}) of
[#passwd{password = Passwd}] when is_binary(Passwd) ->
DigRes = if Digest /= <<"">> ->
Digest == DigestGen(Passwd);
true -> false
end,
if DigRes -> true;
true -> (Passwd == Password) and (Password /= <<"">>)
end;
[#passwd{password = Scram}]
when is_record(Scram, scram) ->
Passwd = jlib:decode_base64(Scram#scram.storedkey),
DigRes = if Digest /= <<"">> ->
Digest == DigestGen(Passwd);
true -> false
end,
if DigRes -> true;
true -> (Passwd == Password) and (Password /= <<"">>)
end;
_ -> false
end.
%% @spec (User::string(), Server::string(), Password::string()) ->
%% ok | {error, invalid_jid}
set_password(User, Server, Password) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
US = {LUser, LServer},
if (LUser == error) or (LServer == error) ->
{error, invalid_jid};
true ->
F = fun () ->
Password2 = case is_scrammed() and is_binary(Password)
of
true -> password_to_scram(Password);
false -> Password
end,
mnesia:write(#passwd{us = US, password = Password2})
end,
{atomic, ok} = mnesia:transaction(F),
ok
end.
%% @spec (User, Server, Password) -> {atomic, ok} | {atomic, exists} | {error, invalid_jid} | {aborted, Reason}
try_register(User, Server, PasswordList) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
Password = iolist_to_binary(PasswordList),
US = {LUser, LServer},
if (LUser == error) or (LServer == error) ->
{error, invalid_jid};
true ->
F = fun () ->
case mnesia:read({passwd, US}) of
[] ->
Password2 = case is_scrammed() and
is_binary(Password)
of
true -> password_to_scram(Password);
false -> Password
end,
mnesia:write(#passwd{us = US,
password = Password2}),
mnesia:dirty_update_counter(reg_users_counter,
LServer, 1),
ok;
[_E] -> exists
end
end,
mnesia:transaction(F)
end.
%% Get all registered users in Mnesia
dirty_get_registered_users() ->
mnesia:dirty_all_keys(passwd).
get_vh_registered_users(Server) ->
LServer = jlib:nameprep(Server),
mnesia:dirty_select(passwd,
[{#passwd{us = '$1', _ = '_'},
[{'==', {element, 2, '$1'}, LServer}], ['$1']}]).
get_vh_registered_users(Server,
[{from, Start}, {to, End}])
when is_integer(Start) and is_integer(End) ->
get_vh_registered_users(Server,
[{limit, End - Start + 1}, {offset, Start}]);
get_vh_registered_users(Server,
[{limit, Limit}, {offset, Offset}])
when is_integer(Limit) and is_integer(Offset) ->
case get_vh_registered_users(Server) of
[] -> [];
Users ->
Set = lists:keysort(1, Users),
L = length(Set),
Start = if Offset < 1 -> 1;
Offset > L -> L;
true -> Offset
end,
lists:sublist(Set, Start, Limit)
end;
get_vh_registered_users(Server, [{prefix, Prefix}])
when is_binary(Prefix) ->
Set = [{U, S}
|| {U, S} <- get_vh_registered_users(Server),
str:prefix(Prefix, U)],
lists:keysort(1, Set);
get_vh_registered_users(Server,
[{prefix, Prefix}, {from, Start}, {to, End}])
when is_binary(Prefix) and is_integer(Start) and
is_integer(End) ->
get_vh_registered_users(Server,
[{prefix, Prefix}, {limit, End - Start + 1},
{offset, Start}]);
get_vh_registered_users(Server,
[{prefix, Prefix}, {limit, Limit}, {offset, Offset}])
when is_binary(Prefix) and is_integer(Limit) and
is_integer(Offset) ->
case [{U, S}
|| {U, S} <- get_vh_registered_users(Server),
str:prefix(Prefix, U)]
of
[] -> [];
Users ->
Set = lists:keysort(1, Users),
L = length(Set),
Start = if Offset < 1 -> 1;
Offset > L -> L;
true -> Offset
end,
lists:sublist(Set, Start, Limit)
end;
get_vh_registered_users(Server, _) ->
get_vh_registered_users(Server).
get_vh_registered_users_number(Server) ->
LServer = jlib:nameprep(Server),
Query = mnesia:dirty_select(reg_users_counter,
[{#reg_users_counter{vhost = LServer,
count = '$1'},
[], ['$1']}]),
case Query of
[Count] -> Count;
_ -> 0
end.
get_vh_registered_users_number(Server,
[{prefix, Prefix}])
when is_binary(Prefix) ->
Set = [{U, S}
|| {U, S} <- get_vh_registered_users(Server),
str:prefix(Prefix, U)],
length(Set);
get_vh_registered_users_number(Server, _) ->
get_vh_registered_users_number(Server).
get_password(User, Server) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
US = {LUser, LServer},
case catch mnesia:dirty_read(passwd, US) of
[#passwd{password = Password}]
when is_binary(Password) ->
Password;
[#passwd{password = Scram}]
when is_record(Scram, scram) ->
{jlib:decode_base64(Scram#scram.storedkey),
jlib:decode_base64(Scram#scram.serverkey),
jlib:decode_base64(Scram#scram.salt),
Scram#scram.iterationcount};
_ -> false
end.
get_password_s(User, Server) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
US = {LUser, LServer},
case catch mnesia:dirty_read(passwd, US) of
[#passwd{password = Password}]
when is_binary(Password) ->
Password;
[#passwd{password = Scram}]
when is_record(Scram, scram) ->
<<"">>;
_ -> <<"">>
end.
%% @spec (User, Server) -> true | false | {error, Error}
is_user_exists(User, Server) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
US = {LUser, LServer},
case catch mnesia:dirty_read({passwd, US}) of
[] -> false;
[_] -> true;
Other -> {error, Other}
end.
%% @spec (User, Server) -> ok
%% @doc Remove user.
%% Note: it returns ok even if there was some problem removing the user.
remove_user(User, Server) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
US = {LUser, LServer},
F = fun () ->
mnesia:delete({passwd, US}),
mnesia:dirty_update_counter(reg_users_counter, LServer,
-1)
end,
mnesia:transaction(F),
ok.
%% @spec (User, Server, Password) -> ok | not_exists | not_allowed | bad_request
%% @doc Remove user if the provided password is correct.
remove_user(User, Server, Password) ->
LUser = jlib:nodeprep(User),
LServer = jlib:nameprep(Server),
US = {LUser, LServer},
F = fun () ->
case mnesia:read({passwd, US}) of
[#passwd{password = Password}]
when is_binary(Password) ->
mnesia:delete({passwd, US}),
mnesia:dirty_update_counter(reg_users_counter, LServer,
-1),
ok;
[#passwd{password = Scram}]
when is_record(Scram, scram) ->
case is_password_scram_valid(Password, Scram) of
true ->
mnesia:delete({passwd, US}),
mnesia:dirty_update_counter(reg_users_counter,
LServer, -1),
ok;
false -> not_allowed
end;
_ -> not_exists
end
end,
case mnesia:transaction(F) of
{atomic, ok} -> ok;
{atomic, Res} -> Res;
_ -> bad_request
end.
update_table() ->
Fields = record_info(fields, passwd),
case mnesia:table_info(passwd, attributes) of
Fields ->
convert_to_binary(Fields),
maybe_scram_passwords(),
ok;
_ ->
?INFO_MSG("Recreating passwd table", []),
mnesia:transform_table(passwd, ignore, Fields)
end.
convert_to_binary(Fields) ->
ejabberd_config:convert_table_to_binary(
passwd, Fields, set,
fun(#passwd{us = {U, _}}) -> U end,
fun(#passwd{us = {U, S}, password = Pass} = R) ->
NewUS = {iolist_to_binary(U), iolist_to_binary(S)},
NewPass = case Pass of
#scram{storedkey = StoredKey,
serverkey = ServerKey,
salt = Salt} ->
Pass#scram{
storedkey = iolist_to_binary(StoredKey),
serverkey = iolist_to_binary(ServerKey),
salt = iolist_to_binary(Salt)};
_ ->
iolist_to_binary(Pass)
end,
R#passwd{us = NewUS, password = NewPass}
end).
%%%
%%% SCRAM
%%%
%% The passwords are stored scrammed in the table either if the option says so,
%% or if at least the first password is scrammed.
is_scrammed() ->
OptionScram = is_option_scram(),
FirstElement = mnesia:dirty_read(passwd,
mnesia:dirty_first(passwd)),
case {OptionScram, FirstElement} of
{true, _} -> true;
{false, [#passwd{password = Scram}]}
when is_record(Scram, scram) ->
true;
_ -> false
end.
is_option_scram() ->
scram ==
ejabberd_config:get_option({auth_password_format, ?MYNAME},
fun(V) -> V end).
maybe_alert_password_scrammed_without_option() ->
case is_scrammed() andalso not is_option_scram() of
true ->
?ERROR_MSG("Some passwords were stored in the database "
"as SCRAM, but 'auth_password_format' "
"is not configured 'scram'. The option "
"will now be considered to be 'scram'.",
[]);
false -> ok
end.
maybe_scram_passwords() ->
case is_scrammed() of
true -> scram_passwords();
false -> ok
end.
scram_passwords() ->
?INFO_MSG("Converting the stored passwords into "
"SCRAM bits",
[]),
Fun = fun (#passwd{password = Password} = P) ->
Scram = password_to_scram(Password),
P#passwd{password = Scram}
end,
Fields = record_info(fields, passwd),
mnesia:transform_table(passwd, Fun, Fields).
password_to_scram(Password) ->
password_to_scram(Password,
?SCRAM_DEFAULT_ITERATION_COUNT).
password_to_scram(Password, IterationCount) ->
Salt = crypto:rand_bytes(?SALT_LENGTH),
SaltedPassword = scram:salted_password(Password, Salt,
IterationCount),
StoredKey =
scram:stored_key(scram:client_key(SaltedPassword)),
ServerKey = scram:server_key(SaltedPassword),
#scram{storedkey = jlib:encode_base64(StoredKey),
serverkey = jlib:encode_base64(ServerKey),
salt = jlib:encode_base64(Salt),
iterationcount = IterationCount}.
is_password_scram_valid(Password, Scram) ->
IterationCount = Scram#scram.iterationcount,
Salt = jlib:decode_base64(Scram#scram.salt),
SaltedPassword = scram:salted_password(Password, Salt,
IterationCount),
StoredKey =
scram:stored_key(scram:client_key(SaltedPassword)),
jlib:decode_base64(Scram#scram.storedkey) == StoredKey.
export(_Server) ->
[{passwd,
fun(Host, #passwd{us = {LUser, LServer}, password = Password})
when LServer == Host ->
Username = ejabberd_odbc:escape(LUser),
Pass = ejabberd_odbc:escape(Password),
[[<<"delete from users where username='">>, Username, <<"';">>],
[<<"insert into users(username, password) "
"values ('">>, Username, <<"', '">>, Pass, <<"');">>]];
(_Host, _R) ->
[]
end}].
import(LServer) ->
[{<<"select username, password from users;">>,
fun([LUser, Password]) ->
#passwd{us = {LUser, LServer}, password = Password}
end}].
import(_LServer, mnesia, #passwd{} = P) ->
mnesia:dirty_write(P);
import(_, _, _) ->
pass.
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