-module(eldap). %%% -------------------------------------------------------------------- %%% Created: 12 Oct 2000 by Tobbe %%% Function: Erlang client LDAP implementation according RFC 2251. %%% The interface is based on RFC 1823, and %%% draft-ietf-asid-ldap-c-api-00.txt %%% %%% Copyright (C) 2000 Torbjorn Tornkvist, tnt@home.se %%% %%% 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 %%% Modified by Sean Hinde 7th Dec 2000 %%% Turned into gen_fsm, made non-blocking, added timers etc to support this. %%% Now has the concept of a name (string() or atom()) per instance which allows %%% multiple users to call by name if so desired. %%% %%% Can be configured with start_link parameters or use a config file to get %%% host to connect to, dn, password, log function etc. %%% Modified by Alexey Shchepin %%% Modified by Evgeniy Khramtsov %%% Implemented queue for bind() requests to prevent pending binds. %%% Modified by Christophe Romain %%% Improve error case handling %%% Modified by Mickael Remond %%% Now use ejabberd log mechanism %%% Modified by: %%% Thomas Baden 2008 April 6th %%% Andy Harb 2008 April 28th %%% Anton Podavalov 2009 February 22th %%% Added LDAPS support, modeled off jungerl eldap.erl version. %%% NOTICE: STARTTLS is not supported. %%% -------------------------------------------------------------------- -vc('$Id$ '). %%%---------------------------------------------------------------------- %%% LDAP Client state machine. %%% Possible states are: %%% connecting - actually disconnected, but retrying periodically %%% wait_bind_response - connected and sent bind request %%% active - bound to LDAP Server and ready to handle commands %%% active_bind - sent bind() request and waiting for response %%%---------------------------------------------------------------------- -behaviour(gen_fsm). -include("ejabberd.hrl"). %% External exports -export([start_link/1, start_link/6]). -export([baseObject/0,singleLevel/0,wholeSubtree/0,close/1, equalityMatch/2,greaterOrEqual/2,lessOrEqual/2, approxMatch/2,search/2,substrings/2,present/1, 'and'/1,'or'/1,'not'/1,modify/3, mod_add/2, mod_delete/2, mod_replace/2, add/3, delete/2, modify_dn/5, bind/3]). -export([get_status/1]). %% gen_fsm callbacks -export([init/1, connecting/2, connecting/3, wait_bind_response/3, active/3, active_bind/3, handle_event/3, handle_sync_event/4, handle_info/3, terminate/3, code_change/4]). -import(lists,[concat/1]). -include("ELDAPv3.hrl"). -include("eldap.hrl"). -define(LDAP_VERSION, 3). -define(RETRY_TIMEOUT, 500). -define(BIND_TIMEOUT, 10000). -define(CMD_TIMEOUT, 100000). %% Used in gen_fsm sync calls. -define(CALL_TIMEOUT, ?CMD_TIMEOUT + ?BIND_TIMEOUT + ?RETRY_TIMEOUT). %% Used as a timeout for gen_tcp:send/2 -define(SEND_TIMEOUT, 30000). -define(MAX_TRANSACTION_ID, 65535). -define(MIN_TRANSACTION_ID, 0). %% Grace period after "soft" LDAP bind errors: -define(GRACEFUL_RETRY_TIMEOUT, 5000). -define(SUPPORTEDEXTENSION, "1.3.6.1.4.1.1466.101.120.7"). -define(SUPPORTEDEXTENSIONSYNTAX, "1.3.6.1.4.1.1466.115.121.1.38"). -define(STARTTLS, "1.3.6.1.4.1.1466.20037"). -record(eldap, {version = ?LDAP_VERSION, hosts, % Possible hosts running LDAP servers host = null, % Connected Host LDAP server port = 389, % The LDAP server port sockmod, % SockMod (gen_tcp|tls) tls = none, % LDAP/LDAPS (none|starttls|tls) tls_options = [], fd = null, % Socket filedescriptor. rootdn = "", % Name of the entry to bind as passwd, % Password for (above) entry id = 0, % LDAP Request ID bind_timer, % Ref to bind timeout dict, % dict holding operation params and results req_q % Queue for requests }). %%%---------------------------------------------------------------------- %%% API %%%---------------------------------------------------------------------- start_link(Name) -> Reg_name = list_to_atom("eldap_" ++ Name), gen_fsm:start_link({local, Reg_name}, ?MODULE, [], []). start_link(Name, Hosts, Port, Rootdn, Passwd, Encrypt) -> Reg_name = list_to_atom("eldap_" ++ Name), gen_fsm:start_link({local, Reg_name}, ?MODULE, {Hosts, Port, Rootdn, Passwd, Encrypt}, []). %%% -------------------------------------------------------------------- %%% Get status of connection. %%% -------------------------------------------------------------------- get_status(Handle) -> Handle1 = get_handle(Handle), gen_fsm:sync_send_all_state_event(Handle1, get_status). %%% -------------------------------------------------------------------- %%% Shutdown connection (and process) asynchronous. %%% -------------------------------------------------------------------- close(Handle) -> Handle1 = get_handle(Handle), gen_fsm:send_all_state_event(Handle1, close). %%% -------------------------------------------------------------------- %%% Add an entry. The entry field MUST NOT exist for the AddRequest %%% to succeed. The parent of the entry MUST exist. %%% Example: %%% %%% add(Handle, %%% "cn=Bill Valentine, ou=people, o=Bluetail AB, dc=bluetail, dc=com", %%% [{"objectclass", ["person"]}, %%% {"cn", ["Bill Valentine"]}, %%% {"sn", ["Valentine"]}, %%% {"telephoneNumber", ["545 555 00"]}] %%% ) %%% -------------------------------------------------------------------- add(Handle, Entry, Attributes) when is_list(Entry), is_list(Attributes) -> Handle1 = get_handle(Handle), gen_fsm:sync_send_event(Handle1, {add, Entry, add_attrs(Attributes)}, ?CALL_TIMEOUT). %%% Do sanity check ! add_attrs(Attrs) -> F = fun({Type,Vals}) when is_list(Type), is_list(Vals) -> %% Confused ? Me too... :-/ {'AddRequest_attributes',Type, Vals} end, case catch lists:map(F, Attrs) of {'EXIT', _} -> throw({error, attribute_values}); Else -> Else end. %%% -------------------------------------------------------------------- %%% Delete an entry. The entry consists of the DN of %%% the entry to be deleted. %%% Example: %%% %%% delete(Handle, %%% "cn=Bill Valentine, ou=people, o=Bluetail AB, dc=bluetail, dc=com" %%% ) %%% -------------------------------------------------------------------- delete(Handle, Entry) when is_list(Entry) -> Handle1 = get_handle(Handle), gen_fsm:sync_send_event(Handle1, {delete, Entry}, ?CALL_TIMEOUT). %%% -------------------------------------------------------------------- %%% Modify an entry. Given an entry a number of modification %%% operations can be performed as one atomic operation. %%% Example: %%% %%% modify(Handle, %%% "cn=Torbjorn Tornkvist, ou=people, o=Bluetail AB, dc=bluetail, dc=com", %%% [replace("telephoneNumber", ["555 555 00"]), %%% add("description", ["LDAP hacker"])] %%% ) %%% -------------------------------------------------------------------- modify(Handle, Object, Mods) when is_list(Object), is_list(Mods) -> Handle1 = get_handle(Handle), gen_fsm:sync_send_event(Handle1, {modify, Object, Mods}, ?CALL_TIMEOUT). %%% %%% Modification operations. %%% Example: %%% replace("telephoneNumber", ["555 555 00"]) %%% mod_add(Type, Values) when is_list(Type), is_list(Values) -> m(add, Type, Values). mod_delete(Type, Values) when is_list(Type), is_list(Values) -> m(delete, Type, Values). mod_replace(Type, Values) when is_list(Type), is_list(Values) -> m(replace, Type, Values). m(Operation, Type, Values) -> #'ModifyRequest_modification_SEQOF'{ operation = Operation, modification = #'AttributeTypeAndValues'{ type = Type, vals = Values}}. %%% -------------------------------------------------------------------- %%% Modify an entry. Given an entry a number of modification %%% operations can be performed as one atomic operation. %%% Example: %%% %%% modify_dn(Handle, %%% "cn=Bill Valentine, ou=people, o=Bluetail AB, dc=bluetail, dc=com", %%% "cn=Ben Emerson", %%% true, %%% "" %%% ) %%% -------------------------------------------------------------------- modify_dn(Handle, Entry, NewRDN, DelOldRDN, NewSup) when is_list(Entry), is_list(NewRDN), is_atom(DelOldRDN), is_list(NewSup) -> Handle1 = get_handle(Handle), gen_fsm:sync_send_event( Handle1, {modify_dn, Entry, NewRDN, bool_p(DelOldRDN), optional(NewSup)}, ?CALL_TIMEOUT). %%% -------------------------------------------------------------------- %%% Bind. %%% Example: %%% %%% bind(Handle, %%% "cn=Bill Valentine, ou=people, o=Bluetail AB, dc=bluetail, dc=com", %%% "secret") %%% -------------------------------------------------------------------- bind(Handle, RootDN, Passwd) when is_list(RootDN), is_list(Passwd) -> Handle1 = get_handle(Handle), gen_fsm:sync_send_event(Handle1, {bind, RootDN, Passwd}, ?CALL_TIMEOUT). %%% Sanity checks ! bool_p(Bool) when Bool==true;Bool==false -> Bool. optional([]) -> asn1_NOVALUE; optional(Value) -> Value. %%% -------------------------------------------------------------------- %%% Synchronous search of the Directory returning a %%% requested set of attributes. %%% %%% Example: %%% %%% Filter = eldap:substrings("sn", [{any,"o"}]), %%% eldap:search(S, [{base, "dc=bluetail, dc=com"}, %%% {filter, Filter}, %%% {attributes,["cn"]}])), %%% %%% Returned result: {ok, #eldap_search_result{}} %%% %%% Example: %%% %%% {ok,{eldap_search_result, %%% [{eldap_entry, %%% "cn=Magnus Froberg, dc=bluetail, dc=com", %%% [{"cn",["Magnus Froberg"]}]}, %%% {eldap_entry, %%% "cn=Torbjorn Tornkvist, dc=bluetail, dc=com", %%% [{"cn",["Torbjorn Tornkvist"]}]}], %%% []}} %%% %%% -------------------------------------------------------------------- search(Handle, A) when is_record(A, eldap_search) -> call_search(Handle, A); search(Handle, L) when is_list(L) -> case catch parse_search_args(L) of {error, Emsg} -> {error, Emsg}; {'EXIT', Emsg} -> {error, Emsg}; A when is_record(A, eldap_search) -> call_search(Handle, A) end. call_search(Handle, A) -> Handle1 = get_handle(Handle), gen_fsm:sync_send_event(Handle1, {search, A}, ?CALL_TIMEOUT). parse_search_args(Args) -> parse_search_args(Args, #eldap_search{scope = wholeSubtree}). parse_search_args([{base, Base}|T],A) -> parse_search_args(T,A#eldap_search{base = Base}); parse_search_args([{filter, Filter}|T],A) -> parse_search_args(T,A#eldap_search{filter = Filter}); parse_search_args([{scope, Scope}|T],A) -> parse_search_args(T,A#eldap_search{scope = Scope}); parse_search_args([{attributes, Attrs}|T],A) -> parse_search_args(T,A#eldap_search{attributes = Attrs}); parse_search_args([{types_only, TypesOnly}|T],A) -> parse_search_args(T,A#eldap_search{types_only = TypesOnly}); parse_search_args([{timeout, Timeout}|T],A) when is_integer(Timeout) -> parse_search_args(T,A#eldap_search{timeout = Timeout}); parse_search_args([{limit, Limit}|T],A) when is_integer(Limit) -> parse_search_args(T,A#eldap_search{limit = Limit}); parse_search_args([H|_],_) -> throw({error,{unknown_arg, H}}); parse_search_args([],A) -> A. %%% %%% The Scope parameter %%% baseObject() -> baseObject. singleLevel() -> singleLevel. wholeSubtree() -> wholeSubtree. %%% %%% Boolean filter operations %%% 'and'(ListOfFilters) when is_list(ListOfFilters) -> {'and',ListOfFilters}. 'or'(ListOfFilters) when is_list(ListOfFilters) -> {'or', ListOfFilters}. 'not'(Filter) when is_tuple(Filter) -> {'not',Filter}. %%% %%% The following Filter parameters consist of an attribute %%% and an attribute value. Example: F("uid","tobbe") %%% equalityMatch(Desc, Value) -> {equalityMatch, av_assert(Desc, Value)}. greaterOrEqual(Desc, Value) -> {greaterOrEqual, av_assert(Desc, Value)}. lessOrEqual(Desc, Value) -> {lessOrEqual, av_assert(Desc, Value)}. approxMatch(Desc, Value) -> {approxMatch, av_assert(Desc, Value)}. av_assert(Desc, Value) -> #'AttributeValueAssertion'{attributeDesc = Desc, assertionValue = Value}. %%% %%% Filter to check for the presence of an attribute %%% present(Attribute) when is_list(Attribute) -> {present, Attribute}. %%% %%% A substring filter seem to be based on a pattern: %%% %%% InitValue*AnyValue*FinalValue %%% %%% where all three parts seem to be optional (at least when %%% talking with an OpenLDAP server). Thus, the arguments %%% to substrings/2 looks like this: %%% %%% Type ::= string( ) %%% SubStr ::= listof( {initial,Value} | {any,Value}, {final,Value}) %%% %%% Example: substrings("sn",[{initial,"To"},{any,"kv"},{final,"st"}]) %%% will match entries containing: 'sn: Tornkvist' %%% substrings(Type, SubStr) when is_list(Type), is_list(SubStr) -> Ss = {'SubstringFilter_substrings',v_substr(SubStr)}, {substrings,#'SubstringFilter'{type = Type, substrings = Ss}}. get_handle(Pid) when is_pid(Pid) -> Pid; get_handle(Atom) when is_atom(Atom) -> Atom; get_handle(Name) when is_list(Name) -> list_to_atom("eldap_" ++ Name). %%%---------------------------------------------------------------------- %%% Callback functions from gen_fsm %%%---------------------------------------------------------------------- %%---------------------------------------------------------------------- %% Func: init/1 %% Returns: {ok, StateName, StateData} | %% {ok, StateName, StateData, Timeout} | %% ignore | %% {stop, StopReason} %% I use the trick of setting a timeout of 0 to pass control into the %% process. %%---------------------------------------------------------------------- init([]) -> case get_config() of {ok, Hosts, Rootdn, Passwd, Encrypt} -> init({Hosts, Rootdn, Passwd, Encrypt}); {error, Reason} -> {stop, Reason} end; init({Hosts, Port, Rootdn, Passwd, Encrypt}) -> catch ssl:start(), {X1,X2,X3} = erlang:now(), ssl:seed(integer_to_list(X1) ++ integer_to_list(X2) ++ integer_to_list(X3)), PortTemp = case Port of undefined -> case Encrypt of tls -> ?LDAPS_PORT; starttls -> ?LDAP_PORT; _ -> ?LDAP_PORT end; PT -> PT end, TLSOpts = [verify_none], {ok, connecting, #eldap{hosts = Hosts, port = PortTemp, rootdn = Rootdn, passwd = Passwd, tls = Encrypt, tls_options = TLSOpts, id = 0, dict = dict:new(), req_q = queue:new()}, 0}. %%---------------------------------------------------------------------- %% Func: StateName/2 %% Called when gen_fsm:send_event/2,3 is invoked (async) %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} %%---------------------------------------------------------------------- connecting(timeout, S) -> {ok, NextState, NewS} = connect_bind(S), {next_state, NextState, NewS}. %%---------------------------------------------------------------------- %% Func: StateName/3 %% Called when gen_fsm:sync_send_event/2,3 is invoked. %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {reply, Reply, NextStateName, NextStateData} | %% {reply, Reply, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} | %% {stop, Reason, Reply, NewStateData} %%---------------------------------------------------------------------- connecting(Event, From, S) -> Q = queue:in({Event, From}, S#eldap.req_q), {next_state, connecting, S#eldap{req_q=Q}}. wait_bind_response(Event, From, S) -> Q = queue:in({Event, From}, S#eldap.req_q), {next_state, wait_bind_response, S#eldap{req_q=Q}}. active_bind(Event, From, S) -> Q = queue:in({Event, From}, S#eldap.req_q), {next_state, active_bind, S#eldap{req_q=Q}}. active(Event, From, S) -> process_command(S, Event, From). %%---------------------------------------------------------------------- %% Func: handle_event/3 %% Called when gen_fsm:send_all_state_event/2 is invoked. %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} %%---------------------------------------------------------------------- handle_event(close, _StateName, S) -> catch (S#eldap.sockmod):close(S#eldap.fd), {stop, normal, S}; handle_event(_Event, StateName, S) -> {next_state, StateName, S}. %%---------------------------------------------------------------------- %% Func: handle_sync_event/4 %% Called when gen_fsm:sync_send_all_state_event/2,3 is invoked %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {reply, Reply, NextStateName, NextStateData} | %% {reply, Reply, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} | %% {stop, Reason, Reply, NewStateData} %%---------------------------------------------------------------------- handle_sync_event(_Event, _From, StateName, S) -> {reply, {StateName, S}, StateName, S}. %%---------------------------------------------------------------------- %% Func: handle_info/3 %% Returns: {next_state, NextStateName, NextStateData} | %% {next_state, NextStateName, NextStateData, Timeout} | %% {stop, Reason, NewStateData} %%---------------------------------------------------------------------- %% %% Packets arriving in various states %% handle_info({Tag, _Socket, Data}, connecting, S) when Tag == tcp; Tag == ssl -> ?DEBUG("tcp packet received when disconnected!~n~p", [Data]), {next_state, connecting, S}; handle_info({Tag, _Socket, Data}, wait_bind_response, S) when Tag == tcp; Tag == ssl -> cancel_timer(S#eldap.bind_timer), case catch recvd_wait_bind_response(Data, S) of bound -> dequeue_commands(S); {fail_bind, Reason} -> report_bind_failure(S#eldap.host, S#eldap.port, Reason), {next_state, connecting, close_and_retry(S, ?GRACEFUL_RETRY_TIMEOUT)}; {'EXIT', Reason} -> report_bind_failure(S#eldap.host, S#eldap.port, Reason), {next_state, connecting, close_and_retry(S)}; {error, Reason} -> report_bind_failure(S#eldap.host, S#eldap.port, Reason), {next_state, connecting, close_and_retry(S)} end; handle_info({Tag, _Socket, Data}, StateName, S) when (StateName == active orelse StateName == active_bind) andalso (Tag == tcp orelse Tag == ssl) -> case catch recvd_packet(Data, S) of {response, Response, RequestType} -> NewS = case Response of {reply, Reply, To, S1} -> gen_fsm:reply(To, Reply), S1; {ok, S1} -> S1 end, if (StateName == active_bind andalso RequestType == bindRequest) orelse (StateName == active) -> dequeue_commands(NewS); true -> {next_state, StateName, NewS} end; _ -> {next_state, StateName, S} end; handle_info({Tag, _Socket}, Fsm_state, S) when Tag == tcp_closed; Tag == ssl_closed -> ?WARNING_MSG("LDAP server closed the connection: ~s:~p~nIn State: ~p", [S#eldap.host, S#eldap.port ,Fsm_state]), {next_state, connecting, close_and_retry(S)}; handle_info({Tag, _Socket, Reason}, Fsm_state, S) when Tag == tcp_error; Tag == ssl_error -> ?DEBUG("eldap received tcp_error: ~p~nIn State: ~p", [Reason, Fsm_state]), {next_state, connecting, close_and_retry(S)}; %% %% Timers %% handle_info({timeout, Timer, {cmd_timeout, Id}}, StateName, S) -> case cmd_timeout(Timer, Id, S) of {reply, To, Reason, NewS} -> gen_fsm:reply(To, Reason), {next_state, StateName, NewS}; {error, _Reason} -> {next_state, StateName, S} end; handle_info({timeout, retry_connect}, connecting, S) -> {ok, NextState, NewS} = connect_bind(S), {next_state, NextState, NewS}; handle_info({timeout, _Timer, bind_timeout}, wait_bind_response, S) -> {next_state, connecting, close_and_retry(S)}; %% %% Make sure we don't fill the message queue with rubbish %% handle_info(Info, StateName, S) -> ?DEBUG("eldap. Unexpected Info: ~p~nIn state: ~p~n when StateData is: ~p", [Info, StateName, S]), {next_state, StateName, S}. %%---------------------------------------------------------------------- %% Func: terminate/3 %% Purpose: Shutdown the fsm %% Returns: any %%---------------------------------------------------------------------- terminate(_Reason, _StateName, _StatData) -> ok. %%---------------------------------------------------------------------- %% Func: code_change/4 %% Purpose: Convert process state when code is changed %% Returns: {ok, NewState, NewStateData} %%---------------------------------------------------------------------- code_change(_OldVsn, StateName, S, _Extra) -> {ok, StateName, S}. %%%---------------------------------------------------------------------- %%% Internal functions %%%---------------------------------------------------------------------- dequeue_commands(S) -> case queue:out(S#eldap.req_q) of {{value, {Event, From}}, Q} -> case process_command(S#eldap{req_q=Q}, Event, From) of {_, active, NewS} -> dequeue_commands(NewS); Res -> Res end; {empty, _} -> {next_state, active, S} end. process_command(S, Event, From) -> case send_command(Event, From, S) of {ok, NewS} -> case Event of {bind, _, _} -> {next_state, active_bind, NewS}; _ -> {next_state, active, NewS} end; {error, _Reason} -> Q = queue:in_r({Event, From}, S#eldap.req_q), NewS = close_and_retry(S#eldap{req_q=Q}), {next_state, connecting, NewS} end. send_command(Command, From, S) -> Id = bump_id(S), {Name, Request} = gen_req(Command), Message = #'LDAPMessage'{messageID = Id, protocolOp = {Name, Request}}, ?DEBUG("~p~n",[{Name, Request}]), {ok, Bytes} = asn1rt:encode('ELDAPv3', 'LDAPMessage', Message), case (S#eldap.sockmod):send(S#eldap.fd, Bytes) of ok -> Timer = erlang:start_timer(?CMD_TIMEOUT, self(), {cmd_timeout, Id}), New_dict = dict:store(Id, [{Timer, Command, From, Name}], S#eldap.dict), {ok, S#eldap{id = Id, dict = New_dict}}; Error -> Error end. gen_req({search, A}) -> {searchRequest, #'SearchRequest'{baseObject = A#eldap_search.base, scope = v_scope(A#eldap_search.scope), derefAliases = neverDerefAliases, sizeLimit = A#eldap_search.limit, timeLimit = v_timeout(A#eldap_search.timeout), typesOnly = v_bool(A#eldap_search.types_only), filter = v_filter(A#eldap_search.filter), attributes = v_attributes(A#eldap_search.attributes) }}; gen_req({add, Entry, Attrs}) -> {addRequest, #'AddRequest'{entry = Entry, attributes = Attrs}}; gen_req({delete, Entry}) -> {delRequest, Entry}; gen_req({modify, Obj, Mod}) -> v_modifications(Mod), {modifyRequest, #'ModifyRequest'{object = Obj, modification = Mod}}; gen_req({modify_dn, Entry, NewRDN, DelOldRDN, NewSup}) -> {modDNRequest, #'ModifyDNRequest'{entry = Entry, newrdn = NewRDN, deleteoldrdn = DelOldRDN, newSuperior = NewSup}}; gen_req({bind, RootDN, Passwd}) -> {bindRequest, #'BindRequest'{version = ?LDAP_VERSION, name = RootDN, authentication = {simple, Passwd}}}. %%----------------------------------------------------------------------- %% recvd_packet %% Deals with incoming packets in the active state %% Will return one of: %% {ok, NewS} - Don't reply to client yet as this is part of a search %% result and we haven't got all the answers yet. %% {reply, Result, From, NewS} - Reply with result to client From %% {error, Reason} %% {'EXIT', Reason} - Broke %%----------------------------------------------------------------------- recvd_packet(Pkt, S) -> check_tag(Pkt), case asn1rt:decode('ELDAPv3', 'LDAPMessage', Pkt) of {ok,Msg} -> Op = Msg#'LDAPMessage'.protocolOp, ?DEBUG("~p",[Op]), Dict = S#eldap.dict, Id = Msg#'LDAPMessage'.messageID, {Timer, From, Name, Result_so_far} = get_op_rec(Id, Dict), Answer = case {Name, Op} of {searchRequest, {searchResEntry, R}} when is_record(R,'SearchResultEntry') -> New_dict = dict:append(Id, R, Dict), {ok, S#eldap{dict = New_dict}}; {searchRequest, {searchResDone, Result}} -> Reason = Result#'LDAPResult'.resultCode, if Reason==success; Reason=='sizeLimitExceeded' -> {Res, Ref} = polish(Result_so_far), New_dict = dict:erase(Id, Dict), cancel_timer(Timer), {reply, #eldap_search_result{entries = Res, referrals = Ref}, From, S#eldap{dict = New_dict}}; true -> New_dict = dict:erase(Id, Dict), cancel_timer(Timer), {reply, {error, Reason}, From, S#eldap{dict = New_dict}} end; {searchRequest, {searchResRef, R}} -> New_dict = dict:append(Id, R, Dict), {ok, S#eldap{dict = New_dict}}; {addRequest, {addResponse, Result}} -> New_dict = dict:erase(Id, Dict), cancel_timer(Timer), Reply = check_reply(Result, From), {reply, Reply, From, S#eldap{dict = New_dict}}; {delRequest, {delResponse, Result}} -> New_dict = dict:erase(Id, Dict), cancel_timer(Timer), Reply = check_reply(Result, From), {reply, Reply, From, S#eldap{dict = New_dict}}; {modifyRequest, {modifyResponse, Result}} -> New_dict = dict:erase(Id, Dict), cancel_timer(Timer), Reply = check_reply(Result, From), {reply, Reply, From, S#eldap{dict = New_dict}}; {modDNRequest, {modDNResponse, Result}} -> New_dict = dict:erase(Id, Dict), cancel_timer(Timer), Reply = check_reply(Result, From), {reply, Reply, From, S#eldap{dict = New_dict}}; {bindRequest, {bindResponse, Result}} -> New_dict = dict:erase(Id, Dict), cancel_timer(Timer), Reply = check_bind_reply(Result, From), {reply, Reply, From, S#eldap{dict = New_dict}}; {OtherName, OtherResult} -> New_dict = dict:erase(Id, Dict), cancel_timer(Timer), {reply, {error, {invalid_result, OtherName, OtherResult}}, From, S#eldap{dict = New_dict}} end, {response, Answer, Name}; Error -> Error end. check_reply(#'LDAPResult'{resultCode = success}, _From) -> ok; check_reply(#'LDAPResult'{resultCode = Reason}, _From) -> {error, Reason}; check_reply(Other, _From) -> {error, Other}. check_bind_reply(#'BindResponse'{resultCode = success}, _From) -> ok; check_bind_reply(#'BindResponse'{resultCode = Reason}, _From) -> {error, Reason}; check_bind_reply(Other, _From) -> {error, Other}. get_op_rec(Id, Dict) -> case dict:find(Id, Dict) of {ok, [{Timer, _Command, From, Name}|Res]} -> {Timer, From, Name, Res}; error -> throw({error, unkown_id}) end. %%----------------------------------------------------------------------- %% recvd_wait_bind_response packet %% Deals with incoming packets in the wait_bind_response state %% Will return one of: %% bound - Success - move to active state %% {fail_bind, Reason} - Failed %% {error, Reason} %% {'EXIT', Reason} - Broken packet %%----------------------------------------------------------------------- recvd_wait_bind_response(Pkt, S) -> check_tag(Pkt), case asn1rt:decode('ELDAPv3', 'LDAPMessage', Pkt) of {ok,Msg} -> ?DEBUG("~p", [Msg]), check_id(S#eldap.id, Msg#'LDAPMessage'.messageID), case Msg#'LDAPMessage'.protocolOp of {bindResponse, Result} -> case Result#'BindResponse'.resultCode of success -> bound; Error -> {fail_bind, Error} end end; Else -> {fail_bind, Else} end. check_id(Id, Id) -> ok; check_id(_, _) -> throw({error, wrong_bind_id}). %%----------------------------------------------------------------------- %% General Helpers %%----------------------------------------------------------------------- cancel_timer(Timer) -> erlang:cancel_timer(Timer), receive {timeout, Timer, _} -> ok after 0 -> ok end. %%% Sanity check of received packet check_tag(Data) -> case asn1rt_ber_bin:decode_tag(Data) of {_Tag, Data1, _Rb} -> case asn1rt_ber_bin:decode_length(Data1) of {{_Len,_Data2}, _Rb2} -> ok; _ -> throw({error,decoded_tag_length}) end; _ -> throw({error,decoded_tag}) end. close_and_retry(S, Timeout) -> catch (S#eldap.sockmod):close(S#eldap.fd), Queue = dict:fold( fun(_Id, [{Timer, Command, From, _Name}|_], Q) -> cancel_timer(Timer), queue:in_r({Command, From}, Q); (_, _, Q) -> Q end, S#eldap.req_q, S#eldap.dict), erlang:send_after(Timeout, self(), {timeout, retry_connect}), S#eldap{fd=null, req_q=Queue, dict=dict:new()}. close_and_retry(S) -> close_and_retry(S, ?RETRY_TIMEOUT). report_bind_failure(Host, Port, Reason) -> ?WARNING_MSG("LDAP bind failed on ~s:~p~nReason: ~p", [Host, Port, Reason]). %%----------------------------------------------------------------------- %% Sort out timed out commands %%----------------------------------------------------------------------- cmd_timeout(Timer, Id, S) -> Dict = S#eldap.dict, case dict:find(Id, Dict) of {ok, [{Timer, _Command, From, Name}|Res]} -> case Name of searchRequest -> {Res1, Ref1} = polish(Res), New_dict = dict:erase(Id, Dict), {reply, From, {timeout, #eldap_search_result{entries = Res1, referrals = Ref1}}, S#eldap{dict = New_dict}}; _ -> New_dict = dict:erase(Id, Dict), {reply, From, {error, timeout}, S#eldap{dict = New_dict}} end; error -> {error, timed_out_cmd_not_in_dict} end. %%----------------------------------------------------------------------- %% Common stuff for results %%----------------------------------------------------------------------- %%% %%% Polish the returned search result %%% polish(Entries) -> polish(Entries, [], []). polish([H|T], Res, Ref) when is_record(H, 'SearchResultEntry') -> ObjectName = H#'SearchResultEntry'.objectName, F = fun({_,A,V}) -> {A,V} end, Attrs = lists:map(F, H#'SearchResultEntry'.attributes), polish(T, [#eldap_entry{object_name = ObjectName, attributes = Attrs}|Res], Ref); polish([H|T], Res, Ref) -> % No special treatment of referrals at the moment. polish(T, Res, [H|Ref]); polish([], Res, Ref) -> {Res, Ref}. %%----------------------------------------------------------------------- %% Connect to next server in list and attempt to bind to it. %%----------------------------------------------------------------------- connect_bind(S) -> Host = next_host(S#eldap.host, S#eldap.hosts), ?INFO_MSG("LDAP connection on ~s:~p", [Host, S#eldap.port]), SocketData = case S#eldap.tls of tls -> SockMod = ssl, SslOpts = [{packet, asn1}, {active, true}, {keepalive, true}, binary], ssl:connect(Host, S#eldap.port, SslOpts); %% starttls -> %% TODO: Implement STARTTLS; _ -> SockMod = gen_tcp, TcpOpts = [{packet, asn1}, {active, true}, {keepalive, true}, {send_timeout, ?SEND_TIMEOUT}, binary], gen_tcp:connect(Host, S#eldap.port, TcpOpts) end, case SocketData of {ok, Socket} -> case bind_request(Socket, S#eldap{sockmod = SockMod}) of {ok, NewS} -> Timer = erlang:start_timer(?BIND_TIMEOUT, self(), {timeout, bind_timeout}), {ok, wait_bind_response, NewS#eldap{fd = Socket, sockmod = SockMod, host = Host, bind_timer = Timer}}; {error, Reason} -> report_bind_failure(Host, S#eldap.port, Reason), NewS = close_and_retry(S), {ok, connecting, NewS#eldap{host = Host}} end; {error, Reason} -> ?ERROR_MSG("LDAP connection failed on ~s:~p~nReason: ~p", [Host, S#eldap.port, Reason]), NewS = close_and_retry(S), {ok, connecting, NewS#eldap{host = Host}} end. bind_request(Socket, S) -> Id = bump_id(S), Req = #'BindRequest'{version = S#eldap.version, name = S#eldap.rootdn, authentication = {simple, S#eldap.passwd}}, Message = #'LDAPMessage'{messageID = Id, protocolOp = {bindRequest, Req}}, ?DEBUG("Bind Request Message:~p~n",[Message]), {ok, Bytes} = asn1rt:encode('ELDAPv3', 'LDAPMessage', Message), case (S#eldap.sockmod):send(Socket, Bytes) of ok -> {ok, S#eldap{id = Id}}; Error -> Error end. %% Given last tried Server, find next one to try next_host(null, [H|_]) -> H; % First time, take first next_host(Host, Hosts) -> % Find next in turn next_host(Host, Hosts, Hosts). next_host(Host, [Host], Hosts) -> hd(Hosts); % Wrap back to first next_host(Host, [Host|Tail], _Hosts) -> hd(Tail); % Take next next_host(_Host, [], Hosts) -> hd(Hosts); % Never connected before? (shouldn't happen) next_host(Host, [_|T], Hosts) -> next_host(Host, T, Hosts). %%% -------------------------------------------------------------------- %%% Verify the input data %%% -------------------------------------------------------------------- v_filter({'and',L}) -> {'and',L}; v_filter({'or', L}) -> {'or',L}; v_filter({'not',L}) -> {'not',L}; v_filter({equalityMatch,AV}) -> {equalityMatch,AV}; v_filter({greaterOrEqual,AV}) -> {greaterOrEqual,AV}; v_filter({lessOrEqual,AV}) -> {lessOrEqual,AV}; v_filter({approxMatch,AV}) -> {approxMatch,AV}; v_filter({present,A}) -> {present,A}; v_filter({substrings,S}) when is_record(S,'SubstringFilter') -> {substrings,S}; v_filter(_Filter) -> throw({error,concat(["unknown filter: ",_Filter])}). v_modifications(Mods) -> F = fun({_,Op,_}) -> case lists:member(Op,[add,delete,replace]) of true -> true; _ -> throw({error,{mod_operation,Op}}) end end, lists:foreach(F, Mods). v_substr([{Key,Str}|T]) when is_list(Str),Key==initial;Key==any;Key==final -> [{Key,Str}|v_substr(T)]; v_substr([H|_]) -> throw({error,{substring_arg,H}}); v_substr([]) -> []. v_scope(baseObject) -> baseObject; v_scope(singleLevel) -> singleLevel; v_scope(wholeSubtree) -> wholeSubtree; v_scope(_Scope) -> throw({error,concat(["unknown scope: ",_Scope])}). v_bool(true) -> true; v_bool(false) -> false; v_bool(_Bool) -> throw({error,concat(["not Boolean: ",_Bool])}). v_timeout(I) when is_integer(I), I>=0 -> I; v_timeout(_I) -> throw({error,concat(["timeout not positive integer: ",_I])}). v_attributes(Attrs) -> F = fun(A) when is_list(A) -> A; (A) -> throw({error,concat(["attribute not String: ",A])}) end, lists:map(F,Attrs). %%% -------------------------------------------------------------------- %%% Get and Validate the initial configuration %%% -------------------------------------------------------------------- get_config() -> Priv_dir = code:priv_dir(eldap), File = filename:join(Priv_dir, "eldap.conf"), case file:consult(File) of {ok, Entries} -> case catch parse(Entries) of {ok, Hosts, Port, Rootdn, Passwd, Encrypt} -> {ok, Hosts, Port, Rootdn, Passwd, Encrypt}; {error, Reason} -> {error, Reason}; {'EXIT', Reason} -> {error, Reason} end; {error, Reason} -> {error, Reason} end. parse(Entries) -> {ok, get_hosts(host, Entries), get_integer(port, Entries), get_list(rootdn, Entries), get_list(passwd, Entries), get_atom(encrypt, Entries)}. get_integer(Key, List) -> case lists:keysearch(Key, 1, List) of {value, {Key, Value}} when is_integer(Value) -> Value; {value, {Key, _Value}} -> throw({error, "Bad Value in Config for " ++ atom_to_list(Key)}); false -> throw({error, "No Entry in Config for " ++ atom_to_list(Key)}) end. get_list(Key, List) -> case lists:keysearch(Key, 1, List) of {value, {Key, Value}} when is_list(Value) -> Value; {value, {Key, _Value}} -> throw({error, "Bad Value in Config for " ++ atom_to_list(Key)}); false -> throw({error, "No Entry in Config for " ++ atom_to_list(Key)}) end. get_atom(Key, List) -> case lists:keysearch(Key, 1, List) of {value, {Key, Value}} when is_atom(Value) -> Value; {value, {Key, _Value}} -> throw({error, "Bad Value in Config for " ++ atom_to_list(Key)}); false -> throw({error, "No Entry in Config for " ++ atom_to_list(Key)}) end. get_hosts(Key, List) -> lists:map(fun({Key1, {A,B,C,D}}) when is_integer(A), is_integer(B), is_integer(C), is_integer(D), Key == Key1-> {A,B,C,D}; ({Key1, Value}) when is_list(Value), Key == Key1-> Value; ({_Else, _Value}) -> throw({error, "Bad Hostname in config"}) end, List). %%% -------------------------------------------------------------------- %%% Other Stuff %%% -------------------------------------------------------------------- bump_id(#eldap{id = Id}) when Id > ?MAX_TRANSACTION_ID -> ?MIN_TRANSACTION_ID; bump_id(#eldap{id = Id}) -> Id + 1.