diff options
Diffstat (limited to 'lib/ssl/src/ssl_tls_dist_proxy.erl')
| -rw-r--r-- | lib/ssl/src/ssl_tls_dist_proxy.erl | 218 |
1 files changed, 188 insertions, 30 deletions
diff --git a/lib/ssl/src/ssl_tls_dist_proxy.erl b/lib/ssl/src/ssl_tls_dist_proxy.erl index 273d3b5521..12a057fd22 100644 --- a/lib/ssl/src/ssl_tls_dist_proxy.erl +++ b/lib/ssl/src/ssl_tls_dist_proxy.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 2011-2013. All Rights Reserved. +%% Copyright Ericsson AB 2011-2017. All Rights Reserved. %% %% Licensed under the Apache License, Version 2.0 (the "License"); %% you may not use this file except in compliance with the License. @@ -20,7 +20,7 @@ -module(ssl_tls_dist_proxy). --export([listen/1, accept/1, connect/2, get_tcp_address/1]). +-export([listen/2, accept/2, connect/4, get_tcp_address/1]). -export([init/1, start_link/0, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3, ssl_options/2]). @@ -39,14 +39,64 @@ %% Internal application API %%==================================================================== -listen(Name) -> - gen_server:call(?MODULE, {listen, Name}, infinity). +listen(Driver, Name) -> + gen_server:call(?MODULE, {listen, Driver, Name}, infinity). + +accept(Driver, Listen) -> + gen_server:call(?MODULE, {accept, Driver, Listen}, infinity). + +connect(Driver, Ip, Port, ExtraOpts) -> + gen_server:call( + ?MODULE, {connect, Driver, Ip, Port, ExtraOpts}, infinity). + + +do_listen(Options) -> + {First,Last} = case application:get_env(kernel,inet_dist_listen_min) of + {ok,N} when is_integer(N) -> + case application:get_env(kernel, + inet_dist_listen_max) of + {ok,M} when is_integer(M) -> + {N,M}; + _ -> + {N,N} + end; + _ -> + {0,0} + end, + do_listen(First, Last, listen_options([{backlog,128}|Options])). + +do_listen(First,Last,_) when First > Last -> + {error,eaddrinuse}; +do_listen(First,Last,Options) -> + case gen_tcp:listen(First, Options) of + {error, eaddrinuse} -> + do_listen(First+1,Last,Options); + Other -> + Other + end. -accept(Listen) -> - gen_server:call(?MODULE, {accept, Listen}, infinity). +listen_options(Opts0) -> + Opts1 = + case application:get_env(kernel, inet_dist_use_interface) of + {ok, Ip} -> + [{ip, Ip} | Opts0]; + _ -> + Opts0 + end, + case application:get_env(kernel, inet_dist_listen_options) of + {ok,ListenOpts} -> + ListenOpts ++ Opts1; + _ -> + Opts1 + end. -connect(Ip, Port) -> - gen_server:call(?MODULE, {connect, Ip, Port}, infinity). +connect_options(Opts) -> + case application:get_env(kernel, inet_dist_connect_options) of + {ok,ConnectOpts} -> + lists:ukeysort(1, ConnectOpts ++ Opts); + _ -> + Opts + end. %%==================================================================== %% gen_server callbacks @@ -59,29 +109,37 @@ init([]) -> process_flag(priority, max), {ok, #state{}}. -handle_call({listen, Name}, _From, State) -> - case gen_tcp:listen(0, [{active, false}, {packet,?PPRE}]) of +handle_call({listen, Driver, Name}, _From, State) -> + case gen_tcp:listen(0, [{active, false}, {packet,?PPRE}, {ip, loopback}]) of {ok, Socket} -> - {ok, World} = gen_tcp:listen(0, [{active, false}, binary, {packet,?PPRE}]), + {ok, World} = do_listen([{active, false}, binary, {packet,?PPRE}, {reuseaddr, true}, + Driver:family()]), {ok, TcpAddress} = get_tcp_address(Socket), {ok, WorldTcpAddress} = get_tcp_address(World), {_,Port} = WorldTcpAddress#net_address.address, - {ok, Creation} = erl_epmd:register_node(Name, Port), - {reply, {ok, {Socket, TcpAddress, Creation}}, - State#state{listen={Socket, World}}}; + ErlEpmd = net_kernel:epmd_module(), + case ErlEpmd:register_node(Name, Port, Driver) of + {ok, Creation} -> + {reply, {ok, {Socket, TcpAddress, Creation}}, + State#state{listen={Socket, World}}}; + {error, _} = Error -> + {reply, Error, State} + end; Error -> {reply, Error, State} end; -handle_call({accept, Listen}, {From, _}, State = #state{listen={_, World}}) -> +handle_call({accept, _Driver, Listen}, {From, _}, State = #state{listen={_, World}}) -> Self = self(), ErtsPid = spawn_link(fun() -> accept_loop(Self, erts, Listen, From) end), WorldPid = spawn_link(fun() -> accept_loop(Self, world, World, Listen) end), {reply, ErtsPid, State#state{accept_loop={ErtsPid, WorldPid}}}; -handle_call({connect, Ip, Port}, {From, _}, State) -> +handle_call({connect, Driver, Ip, Port, ExtraOpts}, {From, _}, State) -> Me = self(), - Pid = spawn_link(fun() -> setup_proxy(Ip, Port, Me) end), + Pid = + spawn_link( + fun() -> setup_proxy(Driver, Ip, Port, ExtraOpts, Me) end), receive {Pid, go_ahead, LPort} -> Res = {ok, Socket} = try_connect(LPort), @@ -134,12 +192,18 @@ accept_loop(Proxy, erts = Type, Listen, Extra) -> Extra ! {accept,self(),Socket,inet,proxy}, receive {_Kernel, controller, Pid} -> + inet:setopts(Socket, [nodelay()]), ok = gen_tcp:controlling_process(Socket, Pid), flush_old_controller(Pid, Socket), Pid ! {self(), controller}; {_Kernel, unsupported_protocol} -> exit(unsupported_protocol) end; + {error, closed} -> + %% The listening socket is closed: the proxy process is + %% shutting down. Exit normally, to avoid generating a + %% spurious error report. + exit(normal); Error -> exit(Error) end, @@ -150,6 +214,7 @@ accept_loop(Proxy, world = Type, Listen, Extra) -> case gen_tcp:accept(Listen) of {ok, Socket} -> Opts = get_ssl_options(server), + wait_for_code_server(), case ssl:ssl_accept(Socket, Opts) of {ok, SslSocket} -> PairHandler = @@ -158,6 +223,11 @@ accept_loop(Proxy, world = Type, Listen, Extra) -> end), ok = ssl:controlling_process(SslSocket, PairHandler), flush_old_controller(PairHandler, SslSocket); + {error, {options, _}} = Error -> + %% Bad options: that's probably our fault. Let's log that. + error_logger:error_msg("Cannot accept TLS distribution connection: ~s~n", + [ssl:format_error(Error)]), + gen_tcp:close(Socket); _ -> gen_tcp:close(Socket) end; @@ -166,20 +236,50 @@ accept_loop(Proxy, world = Type, Listen, Extra) -> end, accept_loop(Proxy, Type, Listen, Extra). +wait_for_code_server() -> + %% This is an ugly hack. Upgrading a socket to TLS requires the + %% crypto module to be loaded. Loading the crypto module triggers + %% its on_load function, which calls code:priv_dir/1 to find the + %% directory where its NIF library is. However, distribution is + %% started earlier than the code server, so the code server is not + %% necessarily started yet, and code:priv_dir/1 might fail because + %% of that, if we receive an incoming connection on the + %% distribution port early enough. + %% + %% If the on_load function of a module fails, the module is + %% unloaded, and the function call that triggered loading it fails + %% with 'undef', which is rather confusing. + %% + %% Thus, the ssl_tls_dist_proxy process will terminate, and be + %% restarted by ssl_dist_sup. However, it won't have any memory + %% of being asked by net_kernel to listen for incoming + %% connections. Hence, the node will believe that it's open for + %% distribution, but it actually isn't. + %% + %% So let's avoid that by waiting for the code server to start. + case whereis(code_server) of + undefined -> + timer:sleep(10), + wait_for_code_server(); + Pid when is_pid(Pid) -> + ok + end. + try_connect(Port) -> - case gen_tcp:connect({127,0,0,1}, Port, [{active, false}, {packet,?PPRE}]) of + case gen_tcp:connect({127,0,0,1}, Port, [{active, false}, {packet,?PPRE}, nodelay()]) of R = {ok, _S} -> R; {error, _R} -> try_connect(Port) end. -setup_proxy(Ip, Port, Parent) -> +setup_proxy(Driver, Ip, Port, ExtraOpts, Parent) -> process_flag(trap_exit, true), - Opts = get_ssl_options(client), - case ssl:connect(Ip, Port, [{active, true}, binary, {packet,?PPRE}] ++ Opts) of + Opts = connect_options(ExtraOpts ++ get_ssl_options(client)), + case ssl:connect(Ip, Port, [{active, true}, binary, {packet,?PPRE}, nodelay(), + Driver:family()] ++ Opts) of {ok, World} -> - {ok, ErtsL} = gen_tcp:listen(0, [{active, true}, {ip, {127,0,0,1}}, binary, {packet,?PPRE}]), + {ok, ErtsL} = gen_tcp:listen(0, [{active, true}, {ip, loopback}, binary, {packet,?PPRE}]), {ok, #net_address{address={_,LPort}}} = get_tcp_address(ErtsL), Parent ! {self(), go_ahead, LPort}, case gen_tcp:accept(ErtsL) of @@ -189,29 +289,50 @@ setup_proxy(Ip, Port, Parent) -> Err -> Parent ! {self(), Err} end; + {error, {options, _}} = Err -> + %% Bad options: that's probably our fault. Let's log that. + error_logger:error_msg("Cannot open TLS distribution connection: ~s~n", + [ssl:format_error(Err)]), + Parent ! {self(), Err}; Err -> Parent ! {self(), Err} end. + +%% we may not always want the nodelay behaviour +%% %% for performance reasons + +nodelay() -> + case application:get_env(kernel, dist_nodelay) of + undefined -> + {nodelay, true}; + {ok, true} -> + {nodelay, true}; + {ok, false} -> + {nodelay, false}; + _ -> + {nodelay, true} + end. + setup_connection(World, ErtsListen) -> process_flag(trap_exit, true), {ok, TcpAddress} = get_tcp_address(ErtsListen), {_Addr,Port} = TcpAddress#net_address.address, - {ok, Erts} = gen_tcp:connect({127,0,0,1}, Port, [{active, true}, binary, {packet,?PPRE}]), - ssl:setopts(World, [{active,true}, {packet,?PPRE}]), + {ok, Erts} = gen_tcp:connect({127,0,0,1}, Port, [{active, true}, binary, {packet,?PPRE}, nodelay()]), + ssl:setopts(World, [{active,true}, {packet,?PPRE}, nodelay()]), loop_conn_setup(World, Erts). loop_conn_setup(World, Erts) -> receive {ssl, World, Data = <<$a, _/binary>>} -> gen_tcp:send(Erts, Data), - ssl:setopts(World, [{packet,?PPOST}]), - inet:setopts(Erts, [{packet,?PPOST}]), + ssl:setopts(World, [{packet,?PPOST}, nodelay()]), + inet:setopts(Erts, [{packet,?PPOST}, nodelay()]), loop_conn(World, Erts); {tcp, Erts, Data = <<$a, _/binary>>} -> ssl:send(World, Data), - ssl:setopts(World, [{packet,?PPOST}]), - inet:setopts(Erts, [{packet,?PPOST}]), + ssl:setopts(World, [{packet,?PPOST}, nodelay()]), + inet:setopts(Erts, [{packet,?PPOST}, nodelay()]), loop_conn(World, Erts); {ssl, World, Data = <<_, _/binary>>} -> gen_tcp:send(Erts, Data), @@ -251,6 +372,17 @@ loop_conn(World, Erts) -> end. get_ssl_options(Type) -> + try ets:lookup(ssl_dist_opts, Type) of + [{Type, Opts}] -> + [{erl_dist, true} | Opts]; + _ -> + get_ssl_dist_arguments(Type) + catch + error:badarg -> + get_ssl_dist_arguments(Type) + end. + +get_ssl_dist_arguments(Type) -> case init:get_argument(ssl_dist_opt) of {ok, Args} -> [{erl_dist, true} | ssl_options(Type, lists:append(Args))]; @@ -284,6 +416,18 @@ ssl_options(server, ["server_verify", Value|T]) -> [{verify, atomize(Value)} | ssl_options(server,T)]; ssl_options(client, ["client_verify", Value|T]) -> [{verify, atomize(Value)} | ssl_options(client,T)]; +ssl_options(server, ["server_verify_fun", Value|T]) -> + [{verify_fun, verify_fun(Value)} | ssl_options(server,T)]; +ssl_options(client, ["client_verify_fun", Value|T]) -> + [{verify_fun, verify_fun(Value)} | ssl_options(client,T)]; +ssl_options(server, ["server_crl_check", Value|T]) -> + [{crl_check, atomize(Value)} | ssl_options(server,T)]; +ssl_options(client, ["client_crl_check", Value|T]) -> + [{crl_check, atomize(Value)} | ssl_options(client,T)]; +ssl_options(server, ["server_crl_cache", Value|T]) -> + [{crl_cache, termify(Value)} | ssl_options(server,T)]; +ssl_options(client, ["client_crl_cache", Value|T]) -> + [{crl_cache, termify(Value)} | ssl_options(client,T)]; ssl_options(server, ["server_reuse_sessions", Value|T]) -> [{reuse_sessions, atomize(Value)} | ssl_options(server,T)]; ssl_options(client, ["client_reuse_sessions", Value|T]) -> @@ -308,14 +452,28 @@ ssl_options(server, ["server_dhfile", Value|T]) -> [{dhfile, Value} | ssl_options(server,T)]; ssl_options(server, ["server_fail_if_no_peer_cert", Value|T]) -> [{fail_if_no_peer_cert, atomize(Value)} | ssl_options(server,T)]; -ssl_options(_,_) -> - exit(malformed_ssl_dist_opt). +ssl_options(Type, Opts) -> + error(malformed_ssl_dist_opt, [Type, Opts]). atomize(List) when is_list(List) -> list_to_atom(List); atomize(Atom) when is_atom(Atom) -> Atom. +termify(String) when is_list(String) -> + {ok, Tokens, _} = erl_scan:string(String ++ "."), + {ok, Term} = erl_parse:parse_term(Tokens), + Term. + +verify_fun(Value) -> + case termify(Value) of + {Mod, Func, State} when is_atom(Mod), is_atom(Func) -> + Fun = fun Mod:Func/3, + {Fun, State}; + _ -> + error(malformed_ssl_dist_opt, [Value]) + end. + flush_old_controller(Pid, Socket) -> receive {tcp, Socket, Data} -> |