%%%----------------------------------------------------------------------
%%% File : ejabberd_auth_mnesia.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Authentication via mnesia
%%% Created : 12 Dec 2004 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2021 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_mnesia).
-author('alexey@process-one.net').
-behaviour(ejabberd_auth).
-export([start/1, stop/1, set_password/3, try_register/3,
get_users/2, init_db/0,
count_users/2, get_password/2,
remove_user/2, store_type/1, import/2,
plain_password_required/1, use_cache/1]).
-export([need_transform/1, transform/1]).
-include("logger.hrl").
-include_lib("xmpp/include/scram.hrl").
-include("ejabberd_auth.hrl").
-record(reg_users_counter, {vhost = <<"">> :: binary(),
count = 0 :: integer() | '$1'}).
%%%----------------------------------------------------------------------
%%% API
%%%----------------------------------------------------------------------
start(Host) ->
init_db(),
update_reg_users_counter_table(Host),
ok.
stop(_Host) ->
ok.
init_db() ->
ejabberd_mnesia:create(?MODULE, passwd,
[{disc_only_copies, [node()]},
{attributes, record_info(fields, passwd)}]),
ejabberd_mnesia:create(?MODULE, reg_users_counter,
[{ram_copies, [node()]},
{attributes, record_info(fields, reg_users_counter)}]).
update_reg_users_counter_table(Server) ->
Set = get_users(Server, []),
Size = length(Set),
LServer = jid:nameprep(Server),
F = fun () ->
mnesia:write(#reg_users_counter{vhost = LServer,
count = Size})
end,
mnesia:sync_dirty(F).
use_cache(Host) ->
case mnesia:table_info(passwd, storage_type) of
disc_only_copies ->
ejabberd_option:auth_use_cache(Host);
_ ->
false
end.
plain_password_required(Server) ->
store_type(Server) == scram.
store_type(Server) ->
ejabberd_auth:password_format(Server).
set_password(User, Server, Password) ->
US = {User, Server},
F = fun () ->
mnesia:write(#passwd{us = US, password = Password})
end,
case mnesia:transaction(F) of
{atomic, ok} ->
{cache, {ok, Password}};
{aborted, Reason} ->
?ERROR_MSG("Mnesia transaction failed: ~p", [Reason]),
{nocache, {error, db_failure}}
end.
try_register(User, Server, Password) ->
US = {User, Server},
F = fun () ->
case mnesia:read({passwd, US}) of
[] ->
mnesia:write(#passwd{us = US, password = Password}),
mnesia:dirty_update_counter(reg_users_counter, Server, 1),
{ok, Password};
[_] ->
{error, exists}
end
end,
case mnesia:transaction(F) of
{atomic, Res} ->
{cache, Res};
{aborted, Reason} ->
?ERROR_MSG("Mnesia transaction failed: ~p", [Reason]),
{nocache, {error, db_failure}}
end.
get_users(Server, []) ->
mnesia:dirty_select(passwd,
[{#passwd{us = '$1', _ = '_'},
[{'==', {element, 2, '$1'}, Server}], ['$1']}]);
get_users(Server, [{from, Start}, {to, End}])
when is_integer(Start) and is_integer(End) ->
get_users(Server, [{limit, End - Start + 1}, {offset, Start}]);
get_users(Server, [{limit, Limit}, {offset, Offset}])
when is_integer(Limit) and is_integer(Offset) ->
case get_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_users(Server, [{prefix, Prefix}]) when is_binary(Prefix) ->
Set = [{U, S} || {U, S} <- get_users(Server, []), str:prefix(Prefix, U)],
lists:keysort(1, Set);
get_users(Server, [{prefix, Prefix}, {from, Start}, {to, End}])
when is_binary(Prefix) and is_integer(Start) and is_integer(End) ->
get_users(Server, [{prefix, Prefix}, {limit, End - Start + 1},
{offset, Start}]);
get_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_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_users(Server, _) ->
get_users(Server, []).
count_users(Server, []) ->
case mnesia:dirty_select(
reg_users_counter,
[{#reg_users_counter{vhost = Server, count = '$1'},
[], ['$1']}]) of
[Count] -> Count;
_ -> 0
end;
count_users(Server, [{prefix, Prefix}]) when is_binary(Prefix) ->
Set = [{U, S} || {U, S} <- get_users(Server, []), str:prefix(Prefix, U)],
length(Set);
count_users(Server, _) ->
count_users(Server, []).
get_password(User, Server) ->
case mnesia:dirty_read(passwd, {User, Server}) of
[{passwd, _, {scram, SK, SEK, Salt, IC}}] ->
{cache, {ok, #scram{storedkey = SK, serverkey = SEK,
salt = Salt, hash = sha, iterationcount = IC}}};
[#passwd{password = Password}] ->
{cache, {ok, Password}};
_ ->
{cache, error}
end.
remove_user(User, Server) ->
US = {User, Server},
F = fun () ->
mnesia:delete({passwd, US}),
mnesia:dirty_update_counter(reg_users_counter, Server, -1),
ok
end,
case mnesia:transaction(F) of
{atomic, ok} ->
ok;
{aborted, Reason} ->
?ERROR_MSG("Mnesia transaction failed: ~p", [Reason]),
{error, db_failure}
end.
need_transform(#reg_users_counter{}) ->
false;
need_transform({passwd, {U, S}, Pass}) ->
case Pass of
_ when is_binary(Pass) ->
case store_type(S) of
scram ->
?INFO_MSG("Passwords in Mnesia table 'passwd' "
"will be SCRAM'ed", []),
true;
plain ->
false
end;
{scram, _, _, _, _} ->
case store_type(S) of
scram ->
false;
plain ->
?WARNING_MSG("Some passwords were stored in the database "
"as SCRAM, but 'auth_password_format' "
"is not configured as 'scram': some "
"authentication mechanisms such as DIGEST-MD5 "
"would *fail*", []),
false
end;
#scram{} ->
case store_type(S) of
scram ->
false;
plain ->
?WARNING_MSG("Some passwords were stored in the database "
"as SCRAM, but 'auth_password_format' "
"is not configured as 'scram': some "
"authentication mechanisms such as DIGEST-MD5 "
"would *fail*", []),
false
end;
_ when is_list(U) orelse is_list(S) orelse is_list(Pass) ->
?INFO_MSG("Mnesia table 'passwd' will be converted to binary", []),
true
end.
transform({passwd, {U, S}, Pass})
when is_list(U) orelse is_list(S) orelse is_list(Pass) ->
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,
transform(#passwd{us = NewUS, password = NewPass});
transform(#passwd{us = {U, S}, password = Password} = P)
when is_binary(Password) ->
case store_type(S) of
scram ->
case jid:resourceprep(Password) of
error ->
?ERROR_MSG("SASLprep failed for password of user ~ts@~ts",
[U, S]),
P;
_ ->
Scram = ejabberd_auth:password_to_scram(S, Password),
P#passwd{password = Scram}
end;
plain ->
P
end;
transform({passwd, _, {scram, _, _, _, _}} = P) ->
P;
transform(#passwd{password = #scram{}} = P) ->
P.
import(LServer, [LUser, Password, _TimeStamp]) ->
mnesia:dirty_write(
#passwd{us = {LUser, LServer}, password = Password}).
