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xmpp.chapril.org-ejabberd/src/ejabberd_oauth.erl
Paweł Chmielowski 6d08ecc41f Add ejabberd_oauth:verify_resowner_scope callback back 
This fixes issue #2982
2019-09-06 16:47:22 +02:00

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%%%-------------------------------------------------------------------
%%% File : ejabberd_oauth.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : OAUTH2 support
%%% Created : 20 Mar 2015 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2019 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., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%-------------------------------------------------------------------
-module(ejabberd_oauth).
-behaviour(gen_server).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2,
handle_info/2, terminate/2, code_change/3]).
-export([start_link/0,
get_client_identity/2,
verify_redirection_uri/3,
authenticate_user/2,
authenticate_client/2,
associate_access_code/3,
associate_access_token/3,
associate_refresh_token/3,
check_token/1,
check_token/4,
check_token/2,
scope_in_scope_list/2,
process/2,
config_reloaded/0,
verify_resowner_scope/3]).
-export([get_commands_spec/0,
oauth_issue_token/3, oauth_list_tokens/0, oauth_revoke_token/1]).
-include("xmpp.hrl").
-include("logger.hrl").
-include("ejabberd_http.hrl").
-include("ejabberd_web_admin.hrl").
-include("ejabberd_oauth.hrl").
-include("ejabberd_commands.hrl").
-include("translate.hrl").
-callback init() -> any().
-callback store(#oauth_token{}) -> ok | {error, any()}.
-callback lookup(binary()) -> {ok, #oauth_token{}} | error.
-callback clean(non_neg_integer()) -> any().
%% There are two ways to obtain an oauth token:
%% * Using the web form/api results in the token being generated in behalf of the user providing the user/pass
%% * Using the command line and oauth_issue_token command, the token is generated in behalf of ejabberd' sysadmin
%% (as it has access to ejabberd command line).
get_commands_spec() ->
[
#ejabberd_commands{name = oauth_issue_token, tags = [oauth],
desc = "Issue an oauth token for the given jid",
module = ?MODULE, function = oauth_issue_token,
args = [{jid, string},{ttl, integer}, {scopes, string}],
policy = restricted,
args_example = ["user@server.com", 3600, "connected_users_number;muc_online_rooms"],
args_desc = ["Jid for which issue token",
"Time to live of generated token in seconds",
"List of scopes to allow, separated by ';'"],
result = {result, {tuple, [{token, string}, {scopes, string}, {expires_in, string}]}}
},
#ejabberd_commands{name = oauth_list_tokens, tags = [oauth],
desc = "List oauth tokens, user, scope, and seconds to expire (only Mnesia)",
longdesc = "List oauth tokens, their user and scope, and how many seconds remain until expirity",
module = ?MODULE, function = oauth_list_tokens,
args = [],
policy = restricted,
result = {tokens, {list, {token, {tuple, [{token, string}, {user, string}, {scope, string}, {expires_in, string}]}}}}
},
#ejabberd_commands{name = oauth_revoke_token, tags = [oauth],
desc = "Revoke authorization for a token (only Mnesia)",
module = ?MODULE, function = oauth_revoke_token,
args = [{token, string}],
policy = restricted,
result = {tokens, {list, {token, {tuple, [{token, string}, {user, string}, {scope, string}, {expires_in, string}]}}}},
result_desc = "List of remaining tokens"
}
].
oauth_issue_token(Jid, TTLSeconds, ScopesString) ->
Scopes = [list_to_binary(Scope) || Scope <- string:tokens(ScopesString, ";")],
try jid:decode(list_to_binary(Jid)) of
#jid{luser =Username, lserver = Server} ->
case oauth2:authorize_password({Username, Server}, Scopes, admin_generated) of
{ok, {_Ctx,Authorization}} ->
{ok, {_AppCtx2, Response}} = oauth2:issue_token(Authorization, [{expiry_time, TTLSeconds}]),
{ok, AccessToken} = oauth2_response:access_token(Response),
{ok, VerifiedScope} = oauth2_response:scope(Response),
{AccessToken, VerifiedScope, integer_to_list(TTLSeconds) ++ " seconds"};
{error, Error} ->
{error, Error}
end
catch _:{bad_jid, _} ->
{error, "Invalid JID: " ++ Jid}
end.
oauth_list_tokens() ->
Tokens = mnesia:dirty_match_object(#oauth_token{_ = '_'}),
{MegaSecs, Secs, _MiniSecs} = os:timestamp(),
TS = 1000000 * MegaSecs + Secs,
[{Token, jid:encode(jid:make(U,S)), Scope, integer_to_list(Expires - TS) ++ " seconds"} ||
#oauth_token{token=Token, scope=Scope, us= {U,S},expire=Expires} <- Tokens].
oauth_revoke_token(Token) ->
ok = mnesia:dirty_delete(oauth_token, list_to_binary(Token)),
oauth_list_tokens().
config_reloaded() ->
DBMod = get_db_backend(),
case init_cache(DBMod) of
true ->
ets_cache:setopts(oauth_cache, cache_opts());
false ->
ok
end.
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
init([]) ->
DBMod = get_db_backend(),
DBMod:init(),
init_cache(DBMod),
Expire = expire(),
application:set_env(oauth2, backend, ejabberd_oauth),
application:set_env(oauth2, expiry_time, Expire),
application:start(oauth2),
ejabberd_commands:register_commands(get_commands_spec()),
ejabberd_hooks:add(config_reloaded, ?MODULE, config_reloaded, 50),
erlang:send_after(expire() * 1000, self(), clean),
{ok, ok}.
handle_call(Request, From, State) ->
?WARNING_MSG("Unexpected call from ~p: ~p", [From, Request]),
{noreply, State}.
handle_cast(Msg, State) ->
?WARNING_MSG("Unexpected cast: ~p", [Msg]),
{noreply, State}.
handle_info(clean, State) ->
{MegaSecs, Secs, MiniSecs} = os:timestamp(),
TS = 1000000 * MegaSecs + Secs,
DBMod = get_db_backend(),
DBMod:clean(TS),
erlang:send_after(trunc(expire() * 1000 * (1 + MiniSecs / 1000000)),
self(), clean),
{noreply, State};
handle_info(Info, State) ->
?WARNING_MSG("Unexpected info: ~p", [Info]),
{noreply, State}.
terminate(_Reason, _State) ->
ejabberd_hooks:delete(config_reloaded, ?MODULE, config_reloaded, 50).
code_change(_OldVsn, State, _Extra) -> {ok, State}.
get_client_identity(Client, Ctx) -> {ok, {Ctx, {client, Client}}}.
verify_redirection_uri(_, _, Ctx) -> {ok, Ctx}.
authenticate_user({User, Server}, Ctx) ->
case jid:make(User, Server) of
#jid{} = JID ->
Access =
ejabberd_option:oauth_access(JID#jid.lserver),
case acl:match_rule(JID#jid.lserver, Access, JID) of
allow ->
case Ctx of
{password, Password} ->
case ejabberd_auth:check_password(User, <<"">>, Server, Password) of
true ->
{ok, {Ctx, {user, User, Server}}};
false ->
{error, badpass}
end;
admin_generated ->
{ok, {Ctx, {user, User, Server}}}
end;
deny ->
{error, badpass}
end;
error ->
{error, badpass}
end.
authenticate_client(Client, Ctx) -> {ok, {Ctx, {client, Client}}}.
-spec verify_resowner_scope({user, binary(), binary()}, [binary()], any()) ->
{ok, any(), [binary()]} | {error, any()}.
verify_resowner_scope({user, _User, _Server}, Scope, Ctx) ->
Cmds = [atom_to_binary(Name, utf8) || {Name, _, _} <- ejabberd_commands:list_commands()],
AllowedScopes = [<<"ejabberd:user">>, <<"ejabberd:admin">>, <<"sasl_auth">>] ++ Cmds,
case oauth2_priv_set:is_subset(oauth2_priv_set:new(Scope),
oauth2_priv_set:new(AllowedScopes)) of
true ->
{ok, {Ctx, Scope}};
false ->
{error, badscope}
end;
verify_resowner_scope(_, _, _) ->
{error, badscope}.
%% This is callback for oauth tokens generated through the command line. Only open and admin commands are
%% made available.
%verify_client_scope({client, ejabberd_ctl}, Scope, Ctx) ->
% RegisteredScope = dict:fetch_keys(get_cmd_scopes()),
% case oauth2_priv_set:is_subset(oauth2_priv_set:new(Scope),
% oauth2_priv_set:new(RegisteredScope)) of
% true ->
% {ok, {Ctx, Scope}};
% false ->
% {error, badscope}
% end.
-spec seconds_since_epoch(integer()) -> non_neg_integer().
seconds_since_epoch(Diff) ->
{Mega, Secs, _} = os:timestamp(),
Mega * 1000000 + Secs + Diff.
associate_access_code(_AccessCode, _Context, AppContext) ->
%put(?ACCESS_CODE_TABLE, AccessCode, Context),
{ok, AppContext}.
associate_access_token(AccessToken, Context, AppContext) ->
{user, User, Server} = proplists:get_value(<<"resource_owner">>, Context, <<"">>),
Expire = case proplists:get_value(expiry_time, AppContext, undefined) of
undefined ->
proplists:get_value(<<"expiry_time">>, Context, 0);
ExpiresIn ->
%% There is no clean way in oauth2 lib to actually override the TTL of the generated token.
%% It always pass the global configured value. Here we use the app context to pass the per-case
%% ttl if we want to override it.
seconds_since_epoch(ExpiresIn)
end,
{user, User, Server} = proplists:get_value(<<"resource_owner">>, Context, <<"">>),
Scope = proplists:get_value(<<"scope">>, Context, []),
R = #oauth_token{
token = AccessToken,
us = {jid:nodeprep(User), jid:nodeprep(Server)},
scope = Scope,
expire = Expire
},
store(R),
{ok, AppContext}.
associate_refresh_token(_RefreshToken, _Context, AppContext) ->
%put(?REFRESH_TOKEN_TABLE, RefreshToken, Context),
{ok, AppContext}.
scope_in_scope_list(Scope, ScopeList) ->
TokenScopeSet = oauth2_priv_set:new(Scope),
lists:any(fun(Scope2) ->
oauth2_priv_set:is_member(Scope2, TokenScopeSet) end,
ScopeList).
-spec check_token(binary()) -> {ok, {binary(), binary()}, [binary()]} |
{false, expired | not_found}.
check_token(Token) ->
case lookup(Token) of
{ok, #oauth_token{us = US,
scope = TokenScope,
expire = Expire}} ->
{MegaSecs, Secs, _} = os:timestamp(),
TS = 1000000 * MegaSecs + Secs,
if
Expire > TS ->
{ok, US, TokenScope};
true ->
{false, expired}
end;
_ ->
{false, not_found}
end.
check_token(User, Server, ScopeList, Token) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
case lookup(Token) of
{ok, #oauth_token{us = {LUser, LServer},
scope = TokenScope,
expire = Expire}} ->
{MegaSecs, Secs, _} = os:timestamp(),
TS = 1000000 * MegaSecs + Secs,
if
Expire > TS ->
TokenScopeSet = oauth2_priv_set:new(TokenScope),
lists:any(fun(Scope) ->
oauth2_priv_set:is_member(Scope, TokenScopeSet) end,
ScopeList);
true ->
{false, expired}
end;
_ ->
{false, not_found}
end.
check_token(ScopeList, Token) ->
case lookup(Token) of
{ok, #oauth_token{us = US,
scope = TokenScope,
expire = Expire}} ->
{MegaSecs, Secs, _} = os:timestamp(),
TS = 1000000 * MegaSecs + Secs,
if
Expire > TS ->
TokenScopeSet = oauth2_priv_set:new(TokenScope),
case lists:any(fun(Scope) ->
oauth2_priv_set:is_member(Scope, TokenScopeSet) end,
ScopeList) of
true -> {ok, user, US};
false -> {false, no_matching_scope}
end;
true ->
{false, expired}
end;
_ ->
{false, not_found}
end.
store(R) ->
DBMod = get_db_backend(),
case DBMod:store(R) of
ok ->
ets_cache:delete(oauth_cache, R#oauth_token.token,
ejabberd_cluster:get_nodes());
{error, _} = Err ->
Err
end.
lookup(Token) ->
ets_cache:lookup(oauth_cache, Token,
fun() ->
DBMod = get_db_backend(),
DBMod:lookup(Token)
end).
-spec init_cache(module()) -> boolean().
init_cache(DBMod) ->
UseCache = use_cache(DBMod),
case UseCache of
true ->
ets_cache:new(oauth_cache, cache_opts());
false ->
ets_cache:delete(oauth_cache)
end,
UseCache.
use_cache(DBMod) ->
case erlang:function_exported(DBMod, use_cache, 0) of
true -> DBMod:use_cache();
false -> ejabberd_option:oauth_use_cache()
end.
cache_opts() ->
MaxSize = ejabberd_option:oauth_cache_size(),
CacheMissed = ejabberd_option:oauth_cache_missed(),
LifeTime = ejabberd_option:oauth_cache_life_time(),
[{max_size, MaxSize}, {life_time, LifeTime}, {cache_missed, CacheMissed}].
expire() ->
ejabberd_option:oauth_expire().
-define(DIV(Class, Els),
?XAE(<<"div">>, [{<<"class">>, Class}], Els)).
-define(INPUTID(Type, Name, Value),
?XA(<<"input">>,
[{<<"type">>, Type}, {<<"name">>, Name},
{<<"value">>, Value}, {<<"id">>, Name}])).
-define(LABEL(ID, Els),
?XAE(<<"label">>, [{<<"for">>, ID}], Els)).
process(_Handlers,
#request{method = 'GET', q = Q, lang = Lang,
path = [_, <<"authorization_token">>]}) ->
ResponseType = proplists:get_value(<<"response_type">>, Q, <<"">>),
ClientId = proplists:get_value(<<"client_id">>, Q, <<"">>),
RedirectURI = proplists:get_value(<<"redirect_uri">>, Q, <<"">>),
Scope = proplists:get_value(<<"scope">>, Q, <<"">>),
State = proplists:get_value(<<"state">>, Q, <<"">>),
Form =
?XAE(<<"form">>,
[{<<"action">>, <<"authorization_token">>},
{<<"method">>, <<"post">>}],
[?LABEL(<<"username">>, [?CT(?T("User (jid)")), ?C(<<": ">>)]),
?INPUTID(<<"text">>, <<"username">>, <<"">>),
?BR,
?LABEL(<<"password">>, [?CT(?T("Password")), ?C(<<": ">>)]),
?INPUTID(<<"password">>, <<"password">>, <<"">>),
?INPUT(<<"hidden">>, <<"response_type">>, ResponseType),
?INPUT(<<"hidden">>, <<"client_id">>, ClientId),
?INPUT(<<"hidden">>, <<"redirect_uri">>, RedirectURI),
?INPUT(<<"hidden">>, <<"scope">>, Scope),
?INPUT(<<"hidden">>, <<"state">>, State),
?BR,
?LABEL(<<"ttl">>, [?CT(?T("Token TTL")), ?C(<<": ">>)]),
?XAE(<<"select">>, [{<<"name">>, <<"ttl">>}],
[
?XAC(<<"option">>, [{<<"value">>, <<"3600">>}],<<"1 Hour">>),
?XAC(<<"option">>, [{<<"value">>, <<"86400">>}],<<"1 Day">>),
?XAC(<<"option">>, [{<<"value">>, <<"2592000">>}],<<"1 Month">>),
?XAC(<<"option">>, [{<<"selected">>, <<"selected">>},{<<"value">>, <<"31536000">>}],<<"1 Year">>),
?XAC(<<"option">>, [{<<"value">>, <<"315360000">>}],<<"10 Years">>)]),
?BR,
?INPUTT(<<"submit">>, <<"">>, ?T("Accept"))
]),
Top =
?DIV(<<"section">>,
[?DIV(<<"block">>,
[?A(<<"https://www.ejabberd.im">>,
[?XA(<<"img">>,
[{<<"height">>, <<"32">>},
{<<"src">>, logo()}])]
)])]),
Middle =
?DIV(<<"white section">>,
[?DIV(<<"block">>,
[?XC(<<"h1">>, <<"Authorization request">>),
?XE(<<"p">>,
[?C(<<"Application ">>),
?XC(<<"em">>, ClientId),
?C(<<" wants to access scope ">>),
?XC(<<"em">>, Scope)]),
Form
])]),
Bottom =
?DIV(<<"section">>,
[?DIV(<<"block">>,
[?XAC(<<"a">>,
[{<<"href">>, <<"https://www.ejabberd.im">>},
{<<"title">>, <<"ejabberd XMPP server">>}],
<<"ejabberd">>),
?C(<<" is maintained by ">>),
?XAC(<<"a">>,
[{<<"href">>, <<"https://www.process-one.net">>},
{<<"title">>, <<"ProcessOne - Leader in Instant Messaging and Push Solutions">>}],
<<"ProcessOne">>)
])]),
Body = ?DIV(<<"container">>, [Top, Middle, Bottom]),
ejabberd_web:make_xhtml(web_head(), [Body]);
process(_Handlers,
#request{method = 'POST', q = Q, lang = _Lang,
path = [_, <<"authorization_token">>]}) ->
_ResponseType = proplists:get_value(<<"response_type">>, Q, <<"">>),
ClientId = proplists:get_value(<<"client_id">>, Q, <<"">>),
RedirectURI = proplists:get_value(<<"redirect_uri">>, Q, <<"">>),
SScope = proplists:get_value(<<"scope">>, Q, <<"">>),
StringJID = proplists:get_value(<<"username">>, Q, <<"">>),
#jid{user = Username, server = Server} = jid:decode(StringJID),
Password = proplists:get_value(<<"password">>, Q, <<"">>),
State = proplists:get_value(<<"state">>, Q, <<"">>),
Scope = str:tokens(SScope, <<" ">>),
TTL = proplists:get_value(<<"ttl">>, Q, <<"">>),
ExpiresIn = case TTL of
<<>> -> undefined;
_ -> binary_to_integer(TTL)
end,
case oauth2:authorize_password({Username, Server},
ClientId,
RedirectURI,
Scope,
{password, Password}) of
{ok, {_AppContext, Authorization}} ->
{ok, {_AppContext2, Response}} =
oauth2:issue_token(Authorization, [{expiry_time, ExpiresIn} || ExpiresIn /= undefined ]),
{ok, AccessToken} = oauth2_response:access_token(Response),
{ok, Type} = oauth2_response:token_type(Response),
%%Ugly: workardound to return the correct expirity time, given than oauth2 lib doesn't really have
%%per-case expirity time.
Expires = case ExpiresIn of
undefined ->
{ok, Ex} = oauth2_response:expires_in(Response),
Ex;
_ ->
ExpiresIn
end,
{ok, VerifiedScope} = oauth2_response:scope(Response),
%oauth2_wrq:redirected_access_token_response(ReqData,
% RedirectURI,
% AccessToken,
% Type,
% Expires,
% VerifiedScope,
% State,
% Context);
{302, [{<<"Location">>,
<<RedirectURI/binary,
"?access_token=", AccessToken/binary,
"&token_type=", Type/binary,
"&expires_in=", (integer_to_binary(Expires))/binary,
"&scope=", (str:join(VerifiedScope, <<" ">>))/binary,
"&state=", State/binary>>
}],
ejabberd_web:make_xhtml([?XC(<<"h1">>, <<"302 Found">>)])};
{error, Error} when is_atom(Error) ->
%oauth2_wrq:redirected_error_response(
% ReqData, RedirectURI, Error, State, Context)
{302, [{<<"Location">>,
<<RedirectURI/binary,
"?error=", (atom_to_binary(Error, utf8))/binary,
"&state=", State/binary>>
}],
ejabberd_web:make_xhtml([?XC(<<"h1">>, <<"302 Found">>)])}
end;
process(_Handlers,
#request{method = 'POST', q = Q, lang = _Lang,
path = [_, <<"token">>]}) ->
case proplists:get_value(<<"grant_type">>, Q, <<"">>) of
<<"password">> ->
SScope = proplists:get_value(<<"scope">>, Q, <<"">>),
StringJID = proplists:get_value(<<"username">>, Q, <<"">>),
#jid{user = Username, server = Server} = jid:decode(StringJID),
Password = proplists:get_value(<<"password">>, Q, <<"">>),
Scope = str:tokens(SScope, <<" ">>),
TTL = proplists:get_value(<<"ttl">>, Q, <<"">>),
ExpiresIn = case TTL of
<<>> -> undefined;
_ -> binary_to_integer(TTL)
end,
case oauth2:authorize_password({Username, Server},
Scope,
{password, Password}) of
{ok, {_AppContext, Authorization}} ->
{ok, {_AppContext2, Response}} =
oauth2:issue_token(Authorization, [{expiry_time, ExpiresIn} || ExpiresIn /= undefined ]),
{ok, AccessToken} = oauth2_response:access_token(Response),
{ok, Type} = oauth2_response:token_type(Response),
%%Ugly: workardound to return the correct expirity time, given than oauth2 lib doesn't really have
%%per-case expirity time.
Expires = case ExpiresIn of
undefined ->
{ok, Ex} = oauth2_response:expires_in(Response),
Ex;
_ ->
ExpiresIn
end,
{ok, VerifiedScope} = oauth2_response:scope(Response),
json_response(200, {[
{<<"access_token">>, AccessToken},
{<<"token_type">>, Type},
{<<"scope">>, str:join(VerifiedScope, <<" ">>)},
{<<"expires_in">>, Expires}]});
{error, Error} when is_atom(Error) ->
json_error(400, <<"invalid_grant">>, Error)
end;
_OtherGrantType ->
json_error(400, <<"unsupported_grant_type">>, unsupported_grant_type)
end;
process(_Handlers, _Request) ->
ejabberd_web:error(not_found).
-spec get_db_backend() -> module().
get_db_backend() ->
DBType = ejabberd_option:oauth_db_type(),
list_to_existing_atom("ejabberd_oauth_" ++ atom_to_list(DBType)).
%% Headers as per RFC 6749
json_response(Code, Body) ->
{Code, [{<<"Content-Type">>, <<"application/json;charset=UTF-8">>},
{<<"Cache-Control">>, <<"no-store">>},
{<<"Pragma">>, <<"no-cache">>}],
jiffy:encode(Body)}.
%% OAauth error are defined in:
%% https://tools.ietf.org/html/draft-ietf-oauth-v2-25#section-5.2
json_error(Code, Error, Reason) ->
Desc = json_error_desc(Reason),
Body = {[{<<"error">>, Error},
{<<"error_description">>, Desc}]},
json_response(Code, Body).
json_error_desc(access_denied) -> <<"Access denied">>;
json_error_desc(unsupported_grant_type) -> <<"Unsupported grant type">>;
json_error_desc(invalid_scope) -> <<"Invalid scope">>.
web_head() ->
[?XA(<<"meta">>, [{<<"http-equiv">>, <<"X-UA-Compatible">>},
{<<"content">>, <<"IE=edge">>}]),
?XA(<<"meta">>, [{<<"name">>, <<"viewport">>},
{<<"content">>,
<<"width=device-width, initial-scale=1">>}]),
?XC(<<"title">>, <<"Authorization request">>),
?XC(<<"style">>, css())
].
css() ->
case misc:read_css("oauth.css") of
{ok, Data} -> Data;
{error, _} -> <<>>
end.
logo() ->
case misc:read_img("oauth-logo.png") of
{ok, Img} ->
B64Img = base64:encode(Img),
<<"data:image/png;base64,", B64Img/binary>>;
{error, _} ->
<<>>
end.
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