diff --git a/apps/kolab_guam/src/kolab_guam_session.erl b/apps/kolab_guam/src/kolab_guam_session.erl index 6d33cee..c9f7457 100644 --- a/apps/kolab_guam/src/kolab_guam_session.erl +++ b/apps/kolab_guam/src/kolab_guam_session.erl @@ -1,511 +1,491 @@ %% Copyright 2015 Kolab Systems AG (http://www.kolabsys.com) %% %% Aaron Seigo (Kolab Systems) %% %% 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 3 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, see . -module(kolab_guam_session). -behaviour(gen_server). %% API -export([ start_link/6 ]). %% gen_server callbacks -export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]). %% tests -export([ process_client_data/3 ]). -include("kolab_guam_session.hrl"). %% public API start_link(SupervisorPID, ListenSocket, ImapConfig, ImplicitTLS, TLSConfig, Rules) -> gen_server:start_link(?MODULE, [SupervisorPID, ListenSocket, ImapConfig, ImplicitTLS, TLSConfig, Rules], []). %% gen_server API init([SupervisorPID, ListenSocket, ServerConfig, ImplicitTLS, TLSConfig, Rules]) -> %% accepting a connection is blocking .. so do it async %% lager:debug("Starting a session handler on socket ~p for listener ~p", [ListenSocket, SupervisorPID]), process_flag(trap_exit, true), ActiveRules = init_rules(Rules), gen_server:cast(self(), accept), %% lager:debug("Rules are ~p from ~p", [ActiveRules, Rules]), { ok, #state{ listen_socket = ListenSocket, super_pid = SupervisorPID, client_implicit_tls = ImplicitTLS, tls_config = TLSConfig, server_config = ServerConfig, rules_deciding = ActiveRules } }. handle_call(_Request, _From, State) -> { reply, ok, State }. handle_cast(accept, State = #state{ server_config = ServerConfig } = State) -> %% try to rate limit our responses a bit here so that hammering the socket with connections is survivable timer:sleep(3), { ok, AcceptSocket, TLSActive } = accept_client(State), { ok, ImapSession } = eimap:start_link(ServerConfig), eimap:connect(ImapSession, self(), server_hello), { noreply, State#state{ listen_socket = undefined, socket = AcceptSocket, imap_session = ImapSession, client_tls_active = TLSActive } }; handle_cast(_Msg, State) -> { noreply, State }. handle_info({ tcp_closed, _Socket }, State) -> %lager:debug("Client closed socket"), { stop, normal, State }; handle_info({ tcp_error, _Socket, _Error }, State) -> %lager:debug("Socket error"), { stop, normal, State }; handle_info({ ssl_closed, _Socket }, State) -> %lager:debug("Client closed socket"), { stop, normal, State }; handle_info({ ssl_error, _Socket, _Error }, State) -> %lager:debug("Socket error"), { stop, normal, State }; handle_info({ tcp, Socket, Data }, #state{ client_tls_active = false } = State) -> % lager:debug("Data coming in from client over TCP ~s", [Data]), {Acc, NewState} = process_client_data(Socket, Data, State), forward_literal_data(Acc, NewState), %Required because of socket upgrade, in which case we will end up with the ssl variant here. set_socket_active(NewState), { noreply, NewState }; handle_info({ ssl, Socket, Data }, State) -> % lager:debug("Data coming in from client over SSL, ~p", [Data]), {Acc, NewState} = process_client_data(Socket, Data, State), forward_literal_data(Acc, NewState), ssl:setopts(Socket, [{ active, once }]), { noreply, NewState }; handle_info({ server_hello, ServerHello }, #state{ imap_session = ImapSession, tls_config = TLSConfig, socket = Socket, client_implicit_tls = ImplicitTLS, client_tls_active = TLSActive, deflator = Deflator } = State) -> CorrectedHello = correct_hello(TLSActive, ImplicitTLS, TLSConfig, ServerHello), ServerIdent = proplists:get_value(server_id, ServerHello, <<>>), FullGreeting = <<"* OK [CAPABILITY ", CorrectedHello/binary, "] ", ServerIdent/binary, "\r\n">>, eimap:start_passthrough(ImapSession, self()), relay_response(Socket, postprocess_server_data(Deflator, FullGreeting), TLSActive), { noreply, State }; handle_info({ { rule_data, Module, ResponseToken }, Data }, #state{ rules_active = ActiveRules } = State) -> %lager:debug("Got back data requested by rule ~p: ~p", [Module, Data]), NewActiveRules = case proplists:get_value(Module, ActiveRules) of undefined -> ActiveRules; ModuleState -> NewModuleState = Module:imap_data(ResponseToken, Data, ModuleState), lists:reverse(lists:foldl(fun({ Rule, RuleState }, Acc) -> case Rule =:= Module of true -> [{ Rule, NewModuleState }|Acc]; _ -> [{ Rule, RuleState }|Acc] end end, [], ActiveRules)) end, %TODO: should we also support non-active rules doing imapy things here? { noreply, State#state{ rules_active = NewActiveRules } }; handle_info({ imap_server_response, Data }, #state{ socket = Socket, imap_session = ImapSession, client_tls_active = TLS, deflator = Deflator, rules_active = ActiveRules } = State) -> lager:debug("FROM SERVER: ~p", [Data]), { ModifiedData, CurrentlyActiveRules } = apply_ruleset_serverside(ImapSession, Data, ActiveRules), relay_response(Socket, postprocess_server_data(Deflator, ModifiedData), TLS), NewSplitCommand = update_split_command_state(ModifiedData, State), { noreply, State#state{ rules_active = CurrentlyActiveRules, current_command_split = NewSplitCommand } }; handle_info({ 'EXIT', PID, _Reason }, #state { imap_session = PID } = State) -> { stop, normal, State#state{ imap_session = undefined } }; handle_info(Info, State) -> lager:debug("Received unexpected info... ~p", [Info]), { noreply, State }. terminate(_Reason, #state{ inflator = Inflator, imap_session = ImapSession, deflator = Deflator, socket = Socket, client_implicit_tls = ImplicitTLS, client_tls_active = TLS }) -> close_zlib_handle(Inflator), close_zlib_handle(Deflator), close_socket(ImplicitTLS, TLS, Socket), case ImapSession of undefined -> ok; _ -> exit(ImapSession, kill) end, ok. code_change(_OldVsn, State, _Extra) -> { ok, State }. %% private API %% update_split_command_state updates the split_command being held on to when we get a server response %% in the case of "transactional" messages (such as authentication) where the client and server enter a bidirectional conversation %% that is goverened by rules outside the the usual IMAP call/response pattern, we need to wait for the end of the server response %% since this is relatively expensive due to having to scan the data for the tagged server response, and is not necessary for all other %% IMAP commands, we shortcircuit when the command does not trigger a "transactional" interaction between client and server, and instead %% just always reset the split data state at that point update_split_command_state(Data, #state{ command_split_reset_trigger = reset_on_server_response, current_command_split = CurrentCommandSplit }) -> case CurrentCommandSplit of undefined -> undefined; { Tag, _Command, _Data } -> case binary:match(Data, <>) of nomatch -> CurrentCommandSplit; { 0, _ } -> undefined; { Start, _ } -> case binary:at(Data, Start - 1) of $\n -> undefined; _ -> CurrentCommandSplit end end end; update_split_command_state(_Data, _State) -> undefined. update_split_command_state_client(ClientDataComponents, #state{ command_split_reset_trigger = reset_for_next_client_command, current_command_split = CurrentCommandSplit }) -> %If we have a currently active command (CurrentCommandSplit), then we reset only if we find a new command (and not just on any new line). %This is relevant for multi-line commands such as APPEND, which follow up with a continuation which we want to avoid buffering. case CurrentCommandSplit of undefined -> undefined; _ -> case ClientDataComponents of { <<>>, <<>>, <<>> } -> CurrentCommandSplit; { _Tag, <<>>, <<>> } -> CurrentCommandSplit; { <<>>, _Command, <<>> } -> CurrentCommandSplit; { _Tag, _Command, _Data } -> undefined end end; update_split_command_state_client(_ClientDataComponents, _State) -> undefined. set_socket_active(#state{ client_tls_active = true, socket = Socket}) -> ssl:setopts(Socket, [{ active, once }]); set_socket_active(#state{ client_tls_active = false, socket = Socket}) -> inet:setopts(Socket, [{ active, once }]). accept_client(#state{ client_implicit_tls = true, tls_config = TLSConfig, listen_socket = ListenSocket, super_pid = SupervisorPID }) -> AcceptSocket = accept_socket(ListenSocket, SupervisorPID), { ok, SSLSocket } = case ssl:ssl_accept(AcceptSocket, TLSConfig) of { ok, Socket } -> { ok, Socket }; {error, {tls_alert, Reason}} -> lager:warning("TLS handshake failed with a tls_alert: ~p", [Reason]), ok = gen_tcp:close(AcceptSocket), exit(normal); {error, Reason} when Reason =:= timeout; Reason =:= closed -> lager:info("Socket closed or timed out during TLS handshake: ~p", [Reason]), ok = gen_tcp:close(AcceptSocket), exit(normal) end, %% prep for the next listen ok = ssl:setopts(SSLSocket, [{ active, once }, { mode, binary }]), % lager:info("~p All done!", [self()]), { ok, SSLSocket, true }; accept_client(#state{ listen_socket = ListenSocket, super_pid = SupervisorPID }) -> AcceptSocket = accept_socket(ListenSocket, SupervisorPID), ok = inet:setopts(AcceptSocket, [{ active, once }, { mode, binary }]), { ok, AcceptSocket, false }. accept_socket(ListenSocket, SupervisorPID) -> AcceptResult = gen_tcp:accept(ListenSocket), %% start a new accepting process to replace this one, which is now in use supervisor:start_child(SupervisorPID, []), %% assert that the accept worked { ok, AcceptSocket } = case AcceptResult of { ok, Socket } -> { ok, Socket }; {error, emfile} -> lager:error("Too many files open, you may be running into a file descriptor limitation."), exit(emfile) end, AcceptSocket. close_zlib_handle(undefined) -> ok; close_zlib_handle(Z) -> zlib:close(Z). close_socket(_ImplicitTLS, _TLS, undefined) -> ok; close_socket(_ImplicitTLS, true, Socket) -> ssl:close(Socket); close_socket(true, _TLS, Socket) -> ssl:close(Socket); close_socket(_ImplicitTLS, _TLS, Socket) -> gen_tcp:close(Socket). forward_literal_data(<<>>, _State) -> {}; forward_literal_data(Data, #state{imap_session = ImapSession} = _State) -> eimap:passthrough_data(ImapSession, Data). process_lines(_Socket, State, [], ContinuationBytes, Acc) -> {Acc, State#state{ continuation_bytes = ContinuationBytes }}; process_lines(Socket, State, [Line|MoreLines], 0, Acc) -> - { _StrippedNextLine, NextContinuationBytes } = eimap_utils:num_literal_continuation_bytes(binary:part(Line, 0, byte_size(Line)-2)), - % We don't actually care if there is no literal or just an empty literal since we just pass-through the data. - % The rest of the code expects 0 and never none, so we convert none to 0. - NextNumContinuationBytes = case NextContinuationBytes of - none -> 0; - _ -> NextContinuationBytes - end, + { _StrippedNextLine, NextContinuationBytes, _Result } = eimap_utils:num_literal_continuation_bytes(binary:part(Line, 0, byte_size(Line)-2)), {NewAcc, NewState} = process_client_line(Line, Socket, State, Acc), - process_lines(Socket, NewState, MoreLines, NextNumContinuationBytes, NewAcc); + process_lines(Socket, NewState, MoreLines, NextContinuationBytes, NewAcc); process_lines(Socket, State, [Line|MoreLines], ContinuationBytes, Acc) -> {LiteralPartOfLine, Remainder} = split_binary(Line, min(ContinuationBytes, size(Line))), Lines = case Remainder of <<>> -> MoreLines; _ -> [Remainder|MoreLines] end, process_lines(Socket, State, Lines, ContinuationBytes - size(LiteralPartOfLine), <>). -split(Lines, Data, Pattern) -> - case binary:match(Data, Pattern) of - nomatch -> {lists:reverse(Lines), Data}; - { Start, Length } -> - Num = Start + Length, - <> = Data, - split([Line|Lines], Remainder, Pattern) - end. -split(Lines, Data) -> - split(Lines, Data, binary:compile_pattern(<<"\r\n">>)). - -split_lines(Data) -> - split([], Data). - % Client data is processed as it comes in, but split up by lines if more than one line comes in at a time. % The processing internally buffers data as necessary if it encounters incomplete lines. process_client_data(Socket, Data, #state{ inflator = Inflator, continuation_bytes = ContinuationBytes } = State) -> % TODO: refactor so starttls and compress commands can be made into rules PreprocessData = preprocess_client_data(Inflator, Data, State), lager:debug("FROM CLIENT: ~p", [PreprocessData]), - {Lines, NewLastPartialLine} = split_lines(PreprocessData), + {Lines, NewLastPartialLine} = eimap_utils:split_lines(PreprocessData), {Acc, NewState} = process_lines(Socket, State#state{ buffered_client_data = <<>> }, Lines, ContinuationBytes, <<>>), #state{ buffered_client_data = DataToBuffer, continuation_bytes = NewContinuationBytes} = NewState, NewBuffer = <>, %If we are inside a continuation, forward up to NewContinuationBytes {LiteralPartOfBuffer, NonLiteralPart} = split_binary(NewBuffer, min(NewContinuationBytes, size(NewBuffer))), {<>, NewState#state{ buffered_client_data = NonLiteralPart, continuation_bytes = NewContinuationBytes - size(LiteralPartOfBuffer)}}. process_client_line(Data, Socket, #state{ rules_deciding = UndecidedRules, tls_config = TLSConfig, client_tls_active = TLS, rules_active = ActiveRules, socket = Socket, imap_session = ImapSession, deflator = Deflator, server_config = ServerConfig} = State, Acc) -> ClientDataComponents = eimap_utils:split_command_into_components(Data), case check_for_transmission_change_commands(TLS, TLSConfig, ClientDataComponents, Deflator, Socket) of { socket_upgraded, SSLSocket } -> %% if we have upgraded our socket, then do so to the backend if that hasn't happened auomatically case proplists:get_value(implicit_tls, ServerConfig, false) of false -> eimap:starttls(ImapSession, undefined, undefined); _ -> ok end, { Acc, State#state{ client_tls_active = true, socket = SSLSocket, buffered_client_data = <<>>, current_command_split = undefined, command_split_reset_trigger = undefined } }; { compression, NewInflator, NewDeflator } -> eimap:compress(ImapSession), % TODO: make optional { Acc, State#state{ inflator = NewInflator, deflator = NewDeflator, buffered_client_data = <<>>, current_command_split = undefined, command_split_reset_trigger = undefined } }; nochange -> %We first check if we have to reset the split command before we process the new command in apply_ruleset_clientside NewSplit = update_split_command_state_client(ClientDataComponents, State), { ModifiedData, NewSplitCommand, NewSplitResetTrigger, NewUndecidedRules, NewActiveRules, PostAction } = apply_ruleset_clientside(ImapSession, Socket, Data, ClientDataComponents, NewSplit, UndecidedRules, ActiveRules), { SendThisData, BufferThisData } = case PostAction of perform_passthrough -> {ModifiedData, <<>>}; buffer_data -> {<<>>, Data} end, { <>, State#state{ rules_deciding = NewUndecidedRules, rules_active = NewActiveRules, buffered_client_data = BufferThisData, current_command_split = NewSplitCommand, command_split_reset_trigger = NewSplitResetTrigger } } end. preprocess_client_data(undefined, Data, #state{ buffered_client_data = Buffered }) -> <>; preprocess_client_data(Z, Data, #state{ buffered_client_data = Buffered }) -> Inflated = iolist_to_binary(zlib:inflate(Z, Data)), <>. postprocess_server_data(undefined, Data) -> %% we aren't compressing so there is nothing to do Data; postprocess_server_data(Z, Data) -> iolist_to_binary(zlib:deflate(Z, Data, sync)). init_rules(RuleConfig) -> init_rule(RuleConfig, []). init_rule([], Acc) -> Acc; init_rule([{ RuleName, Config }|RuleConfig], Acc) -> Module = full_rule_name(RuleName), %% we try to new the module, but if something goes wrong, e.g. it does not exist, %% then we skip this config block because it is BROKEN try Module:new(Config) of ModuleState -> init_rule(RuleConfig, [{ Module, ModuleState }|Acc]) catch Type:Error -> lager:warning("Could not create rule for ~p due to failure: ~p ~p", [RuleName, Type, Error]), init_rule(RuleConfig, Acc) end; init_rule([_|RuleConfig], Acc) -> init_rule(RuleConfig, Acc). full_rule_name(Module) when is_atom(Module) -> list_to_atom("kolab_guam_rule_" ++ atom_to_list(Module)). apply_ruleset_serverside(ImapSession, ServerData, CurrentlyActiveRules) -> %TODO: allow undecided rules to opt-in here as well apply_next_rule_serverside(ImapSession, ServerData, [], CurrentlyActiveRules). apply_next_rule_serverside(_ImapSession, ServerData, ActiveRulesAcc, []) -> { ServerData, lists:reverse(ActiveRulesAcc) }; apply_next_rule_serverside(ImapSession, ServerData, ActiveRulesAcc, [{ Module, RuleState } | ActiveRules]) -> %TODO: allow rules to remove themselves from the action during serverside processing? { ModifiedData, ModifiedRuleState } = Module:apply_to_server_message(ImapSession, ServerData, RuleState), apply_next_rule_serverside(ImapSession, ModifiedData, [{ Module, ModifiedRuleState } | ActiveRulesAcc], ActiveRules). apply_ruleset_clientside(_ImapSession, _Socket, ClientData, _ClientDataComponents, _CurrentCommandSplit, [], []) -> { ClientData, undefined, [], [], [], perform_passthrough }; apply_ruleset_clientside(ImapSession, Socket, ClientData, ClientDataComponents, CurrentCommandSplit, UndecidedRules, CurrentlyActiveRules) -> { PostAction, SplitCommand, SplitResetTrigger } = case CurrentCommandSplit of undefined -> case ClientDataComponents of % In case of an empty line ("\r\n") the line is complete (doesn't need to be buffered), but there is also no command or tag. { <<>>, <<>>, <<>> } -> { perform_passthrough, CurrentCommandSplit, reset_for_next_client_command }; { _Tag, <<>>, <<>> } -> { buffer_data, undefined, reset_for_next_client_command }; { _Tag, Command, _Data } = Split -> { perform_passthrough, Split, when_to_reset_split(Command) } end; _ -> { perform_passthrough, CurrentCommandSplit, reset_for_next_client_command } end, { StillUndecided, NewlyActive } = check_undecided(Socket, ClientData, SplitCommand, UndecidedRules), ActiveRules = CurrentlyActiveRules ++ NewlyActive, %lager:info("Active Rules: ~p", [ActiveRules]), { ModifiedData, ActiveRulesRun } = apply_next_rule_clientside(ImapSession, ClientData, SplitCommand, [], ActiveRules), { ModifiedData, SplitCommand, SplitResetTrigger, StillUndecided, ActiveRulesRun, PostAction }. when_to_reset_split(<<"AUTHENTICATE">>) -> reset_on_server_response; when_to_reset_split(<<"authenticate">>) -> reset_on_server_response; when_to_reset_split(_) -> reset_for_next_client_command. check_undecided(_Socket, _ClientData, undefined, Rules) -> %% if we do not have a properly split command ... do nothing! { Rules, [] }; check_undecided(Socket, ClientData, SplitCommand, Rules) -> check_next_undecided_rule(Socket, ClientData, SplitCommand, Rules, { [], [] }). check_next_undecided_rule(_Socket, _ClientData, _SplitCommand, [], Accs) -> Accs; check_next_undecided_rule(Socket, ClientData, SplitCommand, [Rule|Rules], { UndecidedAcc, NewActiveAcc }) -> { Module, RuleState } = Rule, %%lager:debug("Does ~p apply with state ~p? let's find out!", [Module, RuleState]), Application = Module:applies(Socket, ClientData, SplitCommand, RuleState), check_next_undecided_rule(Socket, ClientData, SplitCommand, Rules, applies(Module, Application, UndecidedAcc, NewActiveAcc)). applies(Module, { true, RuleState }, UndecidedAcc, NewActiveAcc) -> { UndecidedAcc, [{ Module, RuleState }|NewActiveAcc] }; applies(_Module, { false, _RuleState }, UndecidedAcc, NewActiveAcc) -> { UndecidedAcc, NewActiveAcc }; applies(Module, { notyet, RuleState }, UndecidedAcc, NewActiveAcc) -> { [{ Module, RuleState }|UndecidedAcc], NewActiveAcc }. apply_next_rule_clientside(_ImapSession, ClientData, _SplitCommand, ActiveRulesAcc, []) -> { ClientData, lists:reverse(ActiveRulesAcc) }; apply_next_rule_clientside(ImapSession, ClientData, SplitCommand, ActiveRulesAcc, [{ Module, RuleState }|Rules]) -> { Data, NewState } = Module:apply_to_client_message(ImapSession, ClientData, SplitCommand, RuleState), apply_next_rule_clientside(ImapSession, Data, SplitCommand, [{ Module, NewState } | ActiveRulesAcc], Rules). relay_response(Socket, Data, false) -> %lager:debug("Sending over non-secure socket ..."), gen_tcp:send(Socket, Data); relay_response(Socket, Data, _TLS) -> %lager:debug("Sending over TLS!"), ssl:send(Socket, Data). check_for_transmission_change_commands(TLS, TLSConfig, ClientDataComponents, Deflator, Socket) -> {Tag, Command, _Data } = ClientDataComponents, case check_tls_state(TLS, TLSConfig, Command, Deflator, Socket, Tag) of nochange -> check_compress_request(Deflator, Command, Socket, TLS, Tag); Response -> Response end. check_tls_state(false, TLSConfig, <<"STARTTLS">>, Deflator, Socket, Tag) -> start_client_tls(TLSConfig, Deflator, Socket, Tag); check_tls_state(false, TLSConfig, <<"starttls">>, Deflator, Socket, Tag) -> start_client_tls(TLSConfig, Deflator, Socket, Tag); check_tls_state(_TLS, _TLSConfig, _Buffer, _Deflator, _Socket, _Tag) -> nochange. start_client_tls(TLSConfig, Deflator, Socket, Tag) -> Response = <>, relay_response(Socket, postprocess_server_data(Deflator, Response), false), inet:setopts(Socket, [{ active, false }]), %% must be set to active false, otherwise can fail depending on timing { ok, SSLSocket } = ssl:ssl_accept(Socket, TLSConfig), { socket_upgraded, SSLSocket }. check_compress_request(undefined, <<"COMPRESS">>, Socket, TLS, Tag) -> start_client_compression(Socket, TLS, Tag); check_compress_request(undefined, <<"compress">>, Socket, TLS, Tag) -> start_client_compression(Socket, TLS, Tag); check_compress_request(_Deflator, _Command, _Socket, _TLS, _Tag) -> nochange. start_client_compression(Socket, TLS, Tag) -> Response = <>, relay_response(Socket, postprocess_server_data(undefined, Response), TLS), %% create an inflate/deflate pair for use with the client Inflator = zlib:open(), ok = zlib:inflateInit(Inflator, -15), Deflator = zlib:open(), ok = zlib:deflateInit(Deflator, 1, deflated, -15, 8, default), { compression, Inflator, Deflator }. -spec correct_hello(TLSActive :: true | false, ImplicitTLS :: true | false, TlSConfig :: [] | list(), ServerHello :: binary()) -> CorrectedHello :: binary(). correct_hello(true, true, _TLSConfig, ServerResponse) -> % the connection is already secured, so don't advertise starttls to the client ensure_hello_does_not_have_starttls(ServerResponse); correct_hello(true, _ImplicitTLS, _TLSConfig, ServerResponse) -> % the connection is already secured, so don't advertise starttls to the client ensure_hello_does_not_have_starttls(ServerResponse); correct_hello(_TLSActive, _ImplicitTLS, [], ServerResponse) -> % guam does not have a TLS config and so can not provide TLS to the client ensure_hello_does_not_have_starttls(ServerResponse); correct_hello(_TLSActive, _ImplicitTLS, _TLSConfig, ServerResponse) -> % guam has a TLS config, and it is not currently active, so make sure to include % STARTTLS in our response regardless of what the backend says ensure_hello_has_starttls(ServerResponse). ensure_hello_has_starttls(ServerResponse) -> ServerHello = proplists:get_value(capabilities, ServerResponse, <<>>), case binary:match(ServerHello, <<"STARTTLS">>) of nomatch -> add_starttls_to_capabilities(ServerHello); _ -> ServerHello end. add_starttls_to_capabilities(ServerHello) -> case binary:match(ServerHello, <<"CAPABILITY ">>) of nomatch -> add_starttls_after_imap4_atom(ServerHello); { Start, End } -> Prefix = binary:part(ServerHello, 0, Start + End), Suffix = binary:part(ServerHello, Start + End, size(ServerHello) - Start - End), CorrectHello = <>, remove_auth_offers(CorrectHello) end. add_starttls_after_imap4_atom(ServerHello) -> case binary:match(ServerHello, <<"IMAP4rev1 ">>) of nomatch -> <<"STARTTLS ", ServerHello/binary>>; { Start, End } -> Prefix = binary:part(ServerHello, 0, Start + End), Suffix = binary:part(ServerHello, Start + End, size(ServerHello) - Start - End), CorrectHello = <>, remove_auth_offers(CorrectHello) end. ensure_hello_does_not_have_starttls(ServerResponse) -> ServerHello = proplists:get_value(capabilities, ServerResponse, <<>>), case binary:match(ServerHello, <<"STARTTLS">>) of nomatch -> ServerHello; { Start, End } -> Prefix = binary:part(ServerHello, 0, Start), Suffix = binary:part(ServerHello, Start + End, size(ServerHello) - Start - End), <> end. remove_auth_offers(ServerHello) -> case binary:match(ServerHello, <<"AUTH=">>) of nomatch -> ensure_advertise_login_disabled(ServerHello); { Start, _End } -> Prefix = binary:part(ServerHello, 0, Start), Suffix = case binary:match(ServerHello, <<" ">>, [{ scope, { Start, size(ServerHello) - Start } }]) of nomatch -> %% end of the line, so no suffix <<>>; { SpaceStart, SpaceEnd } -> binary:part(ServerHello, SpaceStart + SpaceEnd, size(ServerHello) - SpaceStart - SpaceEnd) end, remove_auth_offers(<>) end. ensure_advertise_login_disabled(ServerHello) -> case binary:match(ServerHello, <<"LOGINDISABLED">>) of nomatch -> <>; _ -> ServerHello end. diff --git a/apps/kolab_guam/src/rules/kolab_guam_rule_filter_groupware.erl b/apps/kolab_guam/src/rules/kolab_guam_rule_filter_groupware.erl index 51fa790..cfefbce 100644 --- a/apps/kolab_guam/src/rules/kolab_guam_rule_filter_groupware.erl +++ b/apps/kolab_guam/src/rules/kolab_guam_rule_filter_groupware.erl @@ -1,258 +1,217 @@ %% Copyright 2015 Kolab Systems AG (http://www.kolabsys.com) %% %% Aaron Seigo (Kolab Systems) %% %% 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 3 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, see . -module(kolab_guam_rule_filter_groupware). -export([new/1, applies/4, imap_data/3, apply_to_client_message/4, apply_to_server_message/3]). -behavior(kolab_guam_rule). -include("kolab_guam_rule_filter_groupware.hrl"). new(_Config) -> #state { blacklist = undefined }. applies(_ConnectionDetails, _Buffer, { _Tag, Command, Data }, State) -> Applies = apply_if_id_matches(Command, Data, State), %lager:debug("********** Checking ...~n Command: ~s ~s, Result ~p", [Command, Data, Applies]), { Applies, State }. apply_to_client_message(_ImapSession, Buffer, undefined, State) -> { Buffer, State }; apply_to_client_message(ImapSession, Buffer, { Tag, Command, Data }, State) -> { Active, StateTag } = case is_triggering_command(Command, Data, State) of true -> fetch_metadata(ImapSession, State), { true, Tag }; _ -> { false, <<>> } end, %lager:info("Client sent: ~s ~s ~p", [Command, Data, Active]), { Buffer, State#state{ active = Active, tag = StateTag }}. apply_to_server_message(_ImapSession, Buffer, #state{ active = true } = State) -> filter_folders(Buffer, State); apply_to_server_message(_ImapSession, Buffer, State) -> { Buffer, State }. imap_data(_ResponseToken, { error, _Reason }, State) -> State; imap_data(_ResponseToken, Response, State) -> %TODO: we don't need Foo/Bar if we already have Foo, so filter folders-of-groupwarefolders Blacklist = lists:foldl(fun({ _Folder, [ { _Property, null } ]}, Acc) -> Acc; ({ _Folder, [ { _Property, <<"mail", _Rest/binary>> } ]}, Acc) -> Acc; ({ Folder, _ }, Acc) -> [{ Folder, <> }|Acc] end, [], Response), State#state{ blacklist = Blacklist }. %%PRIVATE is_triggering_command(Command, Data, #state{ trigger_commands = TriggerCommands }) -> %% if the command is in the list of trigger commands and the ending is not "" (which means "send me %% the root and separator" according to RFC 3501), then it is treated as a triggering event lists:any(fun(T) -> (Command =:= T) andalso (binary:longest_common_suffix([Data, <<"\"\"">>]) =/= 2) end, TriggerCommands). fetch_metadata(none, #state{ blacklist = undefined }) -> ok; fetch_metadata(ImapSession, #state{ blacklist = undefined }) -> eimap:get_folder_metadata(ImapSession, self(), { rule_data, ?MODULE, blacklist }, "*", ["/shared/vendor/kolab/folder-type"]); fetch_metadata(_ImapSession, _State) -> ok. apply_if_id_matches(<<"ID">>, Data, _State) -> apply_if_found_kolab(string:str(string:to_lower(binary_to_list(Data)), "/kolab")); apply_if_id_matches(Command, Data, State) -> case is_triggering_command(Command, Data, State) of true -> true; _ -> notyet end. apply_if_found_kolab(0) -> true; apply_if_found_kolab(_) -> false. -split(Lines, Data, Pattern) -> - case binary:match(Data, Pattern) of - nomatch -> {lists:reverse(Lines), Data}; - { Start, Length } -> - Num = Start + Length, - <> = Data, - split([Line|Lines], Remainder, Pattern) - end. -split(Lines, Data) -> - split(Lines, Data, binary:compile_pattern(<<"\r\n">>)). - -% Split Data into a list of lines separated by \r\n (each entry including the \r\n) -split_lines(Data) -> - split([], Data). - -% Literal complete -connect_next_line(Line, RemainingLines, 0) -> - {Line, RemainingLines, ok}; -% Not enough lines to complete the literal -connect_next_line(Line, [], _ContinuationBytes) -> - {Line, [], nok}; -% Connecting the next line -connect_next_line(Line, [NextLine|RemainingLines], ContinuationBytes) -> - connect_next_line(<>, RemainingLines, ContinuationBytes - (byte_size(NextLine)-2)). - -connect_literals([], Acc) -> - {lists:reverse(Acc), []}; -connect_literals([Line|RemainingLines], Acc) -> - { _StrippedNextLine, ContinuationBytes } = eimap_utils:num_literal_continuation_bytes(binary:part(Line, 0, byte_size(Line)-2)), - {FullLine, RemainingLinesAfterConnect, Result} = case ContinuationBytes of - none -> {Line, RemainingLines, ok}; - _ -> connect_next_line(Line, RemainingLines, ContinuationBytes) - end, - case Result of - nok -> {Acc, [Line|RemainingLines]}; - ok -> connect_literals(RemainingLinesAfterConnect, [FullLine|Acc]) - end. - - filter_folders(<<>>, State) -> { <<>>, State#state{ active = true } }; filter_folders(Buffer, #state{ last_chunk = LeftOvers } = State) -> % Add the left overs from the previous buffer to the current buffer FullBuffer = <>, - {Lines, LastChunk} = split_lines(FullBuffer), - {FullLines, RemainingLines} = connect_literals(Lines, []), + {FullLines, LastChunk} = eimap_utils:split_lines_with_literals(FullBuffer), { Response, More } = filter_folders(State, FullLines, { <<>>, true }), - Joined = list_to_binary(RemainingLines), - {<>, State#state{ active = More, last_chunk = <>}}. + {<>, State#state{ active = More, last_chunk = LastChunk}}. filter_folders(_State, [], Return) -> Return; filter_folders(_State, _Folders, { Acc, false }) -> { Acc, false }; filter_folders(State, [Unfiltered|Folders], { Acc, _More }) -> filter_folders(State, Folders, filter_folder(State, Unfiltered, Acc)). filter_folder(_State, <<>>, Acc) -> { Acc, true }; filter_folder(State, <<"* LIST ", Details/binary>> = Response, Acc) -> { filter_on_details(State, Response, Acc, Details), true }; filter_folder(State, <<"* XLIST ", Details/binary>> = Response, Acc) -> { filter_on_details(State, Response, Acc, Details), true }; filter_folder(State, <<"* LSUB ", Details/binary>> = Response, Acc) -> { filter_on_details(State, Response, Acc, Details), true }; filter_folder(State, <<"* STATUS ", Details/binary>> = Response, Acc) -> { filter_on_details(State, Response, Acc, Details), true }; filter_folder(#state{ tag = Tag }, Response, Acc) -> HasMore = case byte_size(Tag) =< byte_size(Response) of true -> case binary:match(Response, Tag, [{ scope, { 0, byte_size(Tag) } }]) of nomatch -> true; _ -> false % we have found our closing tag! end; false -> true end, { add_response(Response, Acc), HasMore }. filter_on_details(#state{ blacklist = Blacklist }, Response, Acc, Details) -> %% Remove "*" and extract response command name { _, Start, _ } = pop_token(Response), %% asterisk { Cmd, _, _ } = pop_token(Start), %% command %% Extract folder name Suffix = case Cmd =:= <<"STATUS">> of true -> Details; _ -> { Pos, _Length } = binary:match(Details, [<<")">>], []), { _Delimiter, Rest, _} = pop_token(binary:part(Details, Pos + 2, byte_size(Details) - Pos - 2)), Rest end, { Folder, _, _ } = pop_token(Suffix), %% Check the folder in blacklist %% io:format("COMPARING ~p ??? ~p~n", [Folder, in_blacklist(Folder, Blacklist)]), case in_blacklist(Folder, Blacklist) of true -> Acc; _ -> add_response(Response, Acc) end. add_response(Response, <<>>) -> Response; add_response(Response, Acc) -> <>. in_blacklist(_Folder, undefined) -> false; in_blacklist(_Folder, []) -> false; in_blacklist(Folder, [{ Literal, Prefix }|List]) -> case Literal =:= Folder of true -> true; _ -> case binary:match(Folder, Prefix) of { 0, _ } -> true; _ -> in_blacklist(Folder, List) end end. %% pop_token from https://github.com/MainframeHQ/switchboard/blob/master/src/imap.erl (BSD Lic.) %% with some small changes by Aleksander Machniak pop_token(Data) -> pop_token(Data, none). pop_token(<<>>, State) -> {none, <<>>, State}; %% Consume hanging spaces pop_token(<<" ", Rest/binary>>, none) -> pop_token(Rest, none); %% \r\n pop_token(<<$\r, $\n, Rest/binary>>, none) -> {crlf, Rest, none}; %% NIL pop_token(<<"NIL", Rest/binary>>, none) -> {nil, Rest, none}; %% ( | ) | [ | ] pop_token(<<$(, Rest/binary>>, none) -> {'(', Rest, none}; pop_token(<<$), Rest/binary>>, none) -> {')', Rest, none}; %% Atom pop_token(<> = Data, {atom, AtomAcc}) when C =:= 32; C =:= 40; C =:= 41; C =:= $(; C =:= $) -> {AtomAcc, Data, none}; pop_token(<<$\r, $\n, _/binary>> = Data, {atom, AtomAcc}) -> {AtomAcc, Data, none}; pop_token(<>, none) when C >= 35, C < 123 -> pop_token(Rest, {atom, <>}); pop_token(<>, {atom, AtomAcc}) when C >= 35, C < 123 -> pop_token(Rest, {atom, <>}); %% Literal Strings pop_token(<<${, Rest/binary>>, none) -> pop_token(Rest, {literal, <<>>}); pop_token(<<$}, $\r, $\n, Rest/binary>>, {literal, ByteAcc}) -> pop_token(Rest, {literal, binary_to_integer(ByteAcc), <<>>}); pop_token(<>, {literal, ByteAcc}) when D >= 48, D < 58 -> pop_token(Rest, {literal, <>}); pop_token(Binary, {literal, Bytes, LiteralAcc}) when is_integer(Bytes) -> case Binary of <> -> {<>, Rest, none}; _ -> %% If the binary is too short, accumulate it in the state pop_token(<<>>, {literal, Bytes - size(Binary), <>}) end; %% Quoted Strings pop_token(<<$", Rest/binary>>, none) -> pop_token(Rest, {quoted, <<>>}); pop_token(<<$\\, C, Rest/binary>>, {quoted, Acc}) -> pop_token(Rest, {quoted, <>}); pop_token(<<$", Rest/binary>>, {quoted, Acc}) -> {Acc, Rest, none}; pop_token(<<$\r, $\n, _>>, {quoted, _}) -> throw({error, crlf_in_quoted}); pop_token(<>, {quoted, Acc}) -> pop_token(Rest, {quoted, <>}); pop_token(Binary, _) -> {none, Binary, none}. diff --git a/rebar.config b/rebar.config index 07cc661..e08c51f 100644 --- a/rebar.config +++ b/rebar.config @@ -1,41 +1,41 @@ %% -*- tab-width: 4;erlang-indent-level: 4;indent-tabs-mode: nil -*- %% ex: ft=erlang ts=4 sw=4 et { erl_opts, [ { parse_transform, lager_transform }, { platform_define, "(linux|solaris|freebsd|darwin)", 'HAVE_SENDFILE' }, debug_info, fail_on_warning ] }. { deps, [ lager, { lager_syslog, "3.*", { git, "git://github.com/basho/lager_syslog.git", { tag, "3.0.1" } } }, - { eimap, ".*", { git, "https://git.kolab.org/diffusion/EI/eimap.git", { tag, "0.4.5" } } } + { eimap, ".*", { git, "https://git.kolab.org/diffusion/EI/eimap.git", { tag, "0.4.6" } } } %% pull in the proper version of meck before jobs 0.3 gets around to pulling in the wrong version ] }. { sub_dirs, [ "apps/kolab_guam" ]}. { erl_first_files, ["apps/kolab_guam/src/kolab_guam_rule.erl"] }. { eunit_opts, [verbose, {skip_deps, true }] }. { eunit_exclude_deps, true }. { cover_enabled, true }. { relx, [ { release, { guam, "0.9.11" }, [kolab_guam]}, { dev_mode, false }, { include_erts, false }, { extended_start_script, true }, { overlay, [ { mkdir, "log/sasl" }, { template, "priv/sys.config", "etc/sys.config" }, { copy, "priv/vm.args", "vm.args" } ] } ] }. %%{require_otp_vsn, "17"}. { pre_hooks, [ { clean, "rm -fr ebin erl_crash.dump" } ] }.