| 1 |
|
%%%---------------------------------------------------------------------- |
| 2 |
|
%%% File : ejabberd_auth_jwt.erl |
| 3 |
|
%%% Author : Astro <astro@spaceboyz.net> |
| 4 |
|
%%% Purpose : Authentification with JSON Web Tokens |
| 5 |
|
%%% Created : 02 Aug 2016 by Stephan Maka <stephan@spaceboyz.net> |
| 6 |
|
%%% |
| 7 |
|
%%% |
| 8 |
|
%%% MongooseIM, Copyright (C) 2016 CostaDigital |
| 9 |
|
%%% |
| 10 |
|
%%% This program is free software; you can redistribute it and/or |
| 11 |
|
%%% modify it under the terms of the GNU General Public License as |
| 12 |
|
%%% published by the Free Software Foundation; either version 2 of the |
| 13 |
|
%%% License, or (at your option) any later version. |
| 14 |
|
%%% |
| 15 |
|
%%% This program is distributed in the hope that it will be useful, |
| 16 |
|
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 |
|
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 |
|
%%% General Public License for more details. |
| 19 |
|
%%% |
| 20 |
|
%%% You should have received a copy of the GNU General Public License |
| 21 |
|
%%% along with this program; if not, write to the Free Software |
| 22 |
|
%%% Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 23 |
|
%%% |
| 24 |
|
%%%---------------------------------------------------------------------- |
| 25 |
|
|
| 26 |
|
-module(ejabberd_auth_jwt). |
| 27 |
|
-author('astro@spaceboyz.net'). |
| 28 |
|
|
| 29 |
|
%% External exports |
| 30 |
|
-behaviour(mongoose_gen_auth). |
| 31 |
|
|
| 32 |
|
-export([start/1, |
| 33 |
|
stop/1, |
| 34 |
|
config_spec/0, |
| 35 |
|
authorize/1, |
| 36 |
|
check_password/4, |
| 37 |
|
check_password/6, |
| 38 |
|
does_user_exist/3, |
| 39 |
|
supports_sasl_module/2, |
| 40 |
|
supported_features/0 |
| 41 |
|
]). |
| 42 |
|
|
| 43 |
|
%% Config spec callbacks |
| 44 |
|
-export([process_jwt_secret/1]). |
| 45 |
|
|
| 46 |
|
-include("mongoose.hrl"). |
| 47 |
|
-include("mongoose_config_spec.hrl"). |
| 48 |
|
|
| 49 |
|
%%%---------------------------------------------------------------------- |
| 50 |
|
%%% API |
| 51 |
|
%%%---------------------------------------------------------------------- |
| 52 |
|
|
| 53 |
|
-spec start(HostType :: mongooseim:host_type()) -> ok. |
| 54 |
|
start(HostType) -> |
| 55 |
:-( |
JWTSecret = get_jwt_secret(HostType), |
| 56 |
:-( |
persistent_term:put({?MODULE, HostType, jwt_secret}, JWTSecret), |
| 57 |
:-( |
ok. |
| 58 |
|
|
| 59 |
|
-spec stop(HostType :: mongooseim:host_type()) -> ok. |
| 60 |
|
stop(_HostType) -> |
| 61 |
:-( |
persistent_term:erase(jwt_secret), |
| 62 |
:-( |
ok. |
| 63 |
|
|
| 64 |
|
-spec config_spec() -> mongoose_config_spec:config_section(). |
| 65 |
|
config_spec() -> |
| 66 |
8 |
#section{ |
| 67 |
|
items = #{<<"secret">> => jwt_secret_config_spec(), |
| 68 |
|
<<"algorithm">> => #option{type = binary, |
| 69 |
|
validate = {enum, algorithms()}}, |
| 70 |
|
<<"username_key">> => #option{type = atom, |
| 71 |
|
validate = non_empty} |
| 72 |
|
}, |
| 73 |
|
required = all |
| 74 |
|
}. |
| 75 |
|
|
| 76 |
|
jwt_secret_config_spec() -> |
| 77 |
8 |
#section{ |
| 78 |
|
items = #{<<"file">> => #option{type = string, |
| 79 |
|
validate = filename}, |
| 80 |
|
<<"env">> => #option{type = string, |
| 81 |
|
validate = non_empty}, |
| 82 |
|
<<"value">> => #option{type = binary}}, |
| 83 |
|
format_items = list, |
| 84 |
|
process = fun ?MODULE:process_jwt_secret/1 |
| 85 |
|
}. |
| 86 |
|
|
| 87 |
:-( |
process_jwt_secret([V]) -> V. |
| 88 |
|
|
| 89 |
|
-spec supports_sasl_module(binary(), cyrsasl:sasl_module()) -> boolean(). |
| 90 |
:-( |
supports_sasl_module(_, Module) -> Module =:= cyrsasl_plain. |
| 91 |
|
|
| 92 |
|
-spec authorize(mongoose_credentials:t()) -> {ok, mongoose_credentials:t()} |
| 93 |
|
| {error, any()}. |
| 94 |
|
authorize(Creds) -> |
| 95 |
:-( |
ejabberd_auth:authorize_with_check_password(?MODULE, Creds). |
| 96 |
|
|
| 97 |
|
-spec check_password(HostType :: mongooseim:host_type(), |
| 98 |
|
LUser :: jid:luser(), |
| 99 |
|
LServer :: jid:lserver(), |
| 100 |
|
Password :: binary()) -> boolean(). |
| 101 |
|
check_password(HostType, LUser, LServer, Password) -> |
| 102 |
:-( |
Key = case persistent_term:get({?MODULE, HostType, jwt_secret}) of |
| 103 |
:-( |
Key1 when is_binary(Key1) -> Key1; |
| 104 |
:-( |
{env, Var} -> list_to_binary(os:getenv(Var)) |
| 105 |
|
end, |
| 106 |
:-( |
BinAlg = mongoose_config:get_opt([{auth, HostType}, jwt, algorithm]), |
| 107 |
:-( |
Alg = binary_to_atom(jid:str_tolower(BinAlg), utf8), |
| 108 |
:-( |
case jwerl:verify(Password, Alg, Key) of |
| 109 |
|
{ok, TokenData} -> |
| 110 |
:-( |
UserKey = mongoose_config:get_opt([{auth,HostType}, jwt, username_key]), |
| 111 |
:-( |
case maps:find(UserKey, TokenData) of |
| 112 |
|
{ok, LUser} -> |
| 113 |
|
%% Login username matches $token_user_key in TokenData |
| 114 |
:-( |
?LOG_INFO(#{what => jwt_success_auth, |
| 115 |
|
text => <<"Successfully authenticated with JWT">>, |
| 116 |
|
user => LUser, server => LServer, |
| 117 |
:-( |
token => TokenData}), |
| 118 |
:-( |
true; |
| 119 |
|
{ok, ExpectedUser} -> |
| 120 |
:-( |
?LOG_WARNING(#{what => wrong_jwt_user, |
| 121 |
|
text => <<"JWT contains wrond user">>, |
| 122 |
|
expected_user => ExpectedUser, |
| 123 |
:-( |
user => LUser, server => LServer}), |
| 124 |
:-( |
false; |
| 125 |
|
error -> |
| 126 |
:-( |
?LOG_WARNING(#{what => missing_jwt_key, |
| 127 |
|
text => <<"Missing key {user_key} in JWT data">>, |
| 128 |
|
user_key => UserKey, token => TokenData, |
| 129 |
:-( |
user => LUser, server => LServer}), |
| 130 |
:-( |
false |
| 131 |
|
end; |
| 132 |
|
{error, Reason} -> |
| 133 |
:-( |
?LOG_WARNING(#{what => jwt_verification_failed, |
| 134 |
|
text => <<"Cannot verify JWT for user">>, |
| 135 |
|
reason => Reason, |
| 136 |
:-( |
user => LUser, server => LServer}), |
| 137 |
:-( |
false |
| 138 |
|
end. |
| 139 |
|
|
| 140 |
|
|
| 141 |
|
-spec check_password(HostType :: mongooseim:host_type(), |
| 142 |
|
LUser :: jid:luser(), |
| 143 |
|
LServer :: jid:lserver(), |
| 144 |
|
Password :: binary(), |
| 145 |
|
Digest :: binary(), |
| 146 |
|
DigestGen :: fun()) -> boolean(). |
| 147 |
|
check_password(HostType, LUser, LServer, Password, _Digest, _DigestGen) -> |
| 148 |
:-( |
check_password(HostType, LUser, LServer, Password). |
| 149 |
|
|
| 150 |
|
-spec does_user_exist(HostType :: mongooseim:host_type(), |
| 151 |
|
LUser :: jid:luser(), |
| 152 |
|
LServer :: jid:lserver()) -> boolean() | {error, atom()}. |
| 153 |
|
does_user_exist(_HostType, _LUser, _LServer) -> |
| 154 |
:-( |
true. |
| 155 |
|
|
| 156 |
|
-spec supported_features() -> [atom()]. |
| 157 |
:-( |
supported_features() -> [dynamic_domains]. |
| 158 |
|
|
| 159 |
|
%%%---------------------------------------------------------------------- |
| 160 |
|
%%% Internal helpers |
| 161 |
|
%%%---------------------------------------------------------------------- |
| 162 |
|
|
| 163 |
|
% A direct path to a file is read only once during startup, |
| 164 |
|
% a path in environment variable is read on every auth request. |
| 165 |
|
-spec get_jwt_secret(mongooseim:host_type()) -> binary() | {env, string()}. |
| 166 |
|
get_jwt_secret(HostType) -> |
| 167 |
:-( |
case mongoose_config:get_opt([{auth, HostType}, jwt, secret]) of |
| 168 |
|
{value, JWTSecret} -> |
| 169 |
:-( |
JWTSecret; |
| 170 |
|
{env, Env} -> |
| 171 |
:-( |
{env, Env}; |
| 172 |
|
{file, Path} -> |
| 173 |
:-( |
{ok, JWTSecret} = file:read_file(Path), |
| 174 |
:-( |
JWTSecret |
| 175 |
|
end. |
| 176 |
|
|
| 177 |
|
algorithms() -> |
| 178 |
8 |
[<<"HS256">>, <<"RS256">>, <<"ES256">>, |
| 179 |
|
<<"HS386">>, <<"RS386">>, <<"ES386">>, |
| 180 |
|
<<"HS512">>, <<"RS512">>, <<"ES512">>]. |