%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2007-2011. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%%----------------------------------------------------------------------
%% Purpose: Manages ssl sessions and trusted certifacates
%%----------------------------------------------------------------------
-module(ssl_manager).
-behaviour(gen_server).
-include("ssl_internal.hrl").
%% Internal application API
-export([start_link/1,
connection_init/2, cache_pem_file/1,
lookup_trusted_cert/3, issuer_candidate/1, client_session_id/4,
server_session_id/4,
register_session/2, register_session/3, invalidate_session/2,
invalidate_session/3]).
% Spawn export
-export([init_session_validator/1]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-include("ssl_handshake.hrl").
-include("ssl_internal.hrl").
-include_lib("kernel/include/file.hrl").
-record(state, {
session_cache,
session_cache_cb,
session_lifetime,
certificate_db,
session_validation_timer
}).
-define('24H_in_msec', 8640000).
-define('24H_in_sec', 8640).
-define(SESSION_VALIDATION_INTERVAL, 60000).
-define(CERTIFICATE_CACHE_CLEANUP, 30000).
-define(CLEAN_SESSION_DB, 60000).
%%====================================================================
%% API
%%====================================================================
%%--------------------------------------------------------------------
-spec start_link(list()) -> {ok, pid()} | ignore | {error, term()}.
%%
%% Description: Starts the server
%%--------------------------------------------------------------------
start_link(Opts) ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [Opts], []).
%%--------------------------------------------------------------------
-spec connection_init(string()| {der, list()}, client | server) ->
{ok, reference(), cache_ref()}.
%%
%% Description: Do necessary initializations for a new connection.
%%--------------------------------------------------------------------
connection_init(Trustedcerts, Role) ->
call({connection_init, Trustedcerts, Role}).
%%--------------------------------------------------------------------
-spec cache_pem_file(string()) -> {ok, term()} | {error, reason()}.
%%
%% Description: Cach a pem file and return its content.
%%--------------------------------------------------------------------
cache_pem_file(File) ->
try file:read_file_info(File) of
{ok, #file_info{mtime = LastWrite}} ->
cache_pem_file(File, LastWrite)
catch
_:Reason ->
{error, Reason}
end.
%%--------------------------------------------------------------------
-spec lookup_trusted_cert(reference(), serialnumber(), issuer()) ->
undefined |
{ok, {der_cert(), #'OTPCertificate'{}}}.
%%
%% Description: Lookup the trusted cert with Key = {reference(),
%% serialnumber(), issuer()}.
%% --------------------------------------------------------------------
lookup_trusted_cert(Ref, SerialNumber, Issuer) ->
ssl_certificate_db:lookup_trusted_cert(Ref, SerialNumber, Issuer).
%%--------------------------------------------------------------------
-spec issuer_candidate(cert_key() | no_candidate) ->
{cert_key(),
{der_cert(),
#'OTPCertificate'{}}} | no_more_candidates.
%%
%% Description: Return next issuer candidate.
%%--------------------------------------------------------------------
issuer_candidate(PrevCandidateKey) ->
ssl_certificate_db:issuer_candidate(PrevCandidateKey).
%%--------------------------------------------------------------------
-spec client_session_id(host(), port_num(), #ssl_options{},
der_cert() | undefined) -> session_id().
%%
%% Description: Select a session id for the client.
%%--------------------------------------------------------------------
client_session_id(Host, Port, SslOpts, OwnCert) ->
call({client_session_id, Host, Port, SslOpts, OwnCert}).
%%--------------------------------------------------------------------
-spec server_session_id(host(), port_num(), #ssl_options{},
der_cert()) -> session_id().
%%
%% Description: Select a session id for the server.
%%--------------------------------------------------------------------
server_session_id(Port, SuggestedSessionId, SslOpts, OwnCert) ->
call({server_session_id, Port, SuggestedSessionId, SslOpts, OwnCert}).
%%--------------------------------------------------------------------
-spec register_session(port_num(), #session{}) -> ok.
-spec register_session(host(), port_num(), #session{}) -> ok.
%%
%% Description: Make the session available for reuse.
%%--------------------------------------------------------------------
register_session(Host, Port, Session) ->
cast({register_session, Host, Port, Session}).
register_session(Port, Session) ->
cast({register_session, Port, Session}).
%%--------------------------------------------------------------------
-spec invalidate_session(port_num(), #session{}) -> ok.
-spec invalidate_session(host(), port_num(), #session{}) -> ok.
%%
%% Description: Make the session unavailable for reuse. After
%% a the session has been marked "is_resumable = false" for some while
%% it will be safe to remove the data from the session database.
%%--------------------------------------------------------------------
invalidate_session(Host, Port, Session) ->
cast({invalidate_session, Host, Port, Session}).
invalidate_session(Port, Session) ->
cast({invalidate_session, Port, Session}).
%%====================================================================
%% gen_server callbacks
%%====================================================================
%%--------------------------------------------------------------------
-spec init(list()) -> {ok, #state{}}.
%% Possible return values not used now.
%% | {ok, #state{}, timeout()} | ignore | {stop, term()}.
%%
%% Description: Initiates the server
%%--------------------------------------------------------------------
init([Opts]) ->
process_flag(trap_exit, true),
CacheCb = proplists:get_value(session_cb, Opts, ssl_session_cache),
SessionLifeTime =
proplists:get_value(session_lifetime, Opts, ?'24H_in_sec'),
CertDb = ssl_certificate_db:create(),
SessionCache = CacheCb:init(proplists:get_value(session_cb_init_args, Opts, [])),
Timer = erlang:send_after(SessionLifeTime * 1000,
self(), validate_sessions),
{ok, #state{certificate_db = CertDb,
session_cache = SessionCache,
session_cache_cb = CacheCb,
session_lifetime = SessionLifeTime,
session_validation_timer = Timer}}.
%%--------------------------------------------------------------------
-spec handle_call(msg(), from(), #state{}) -> {reply, reply(), #state{}}.
%% Possible return values not used now.
%% {reply, reply(), #state{}, timeout()} |
%% {noreply, #state{}} |
%% {noreply, #state{}, timeout()} |
%% {stop, reason(), reply(), #state{}} |
%% {stop, reason(), #state{}}.
%%
%% Description: Handling call messages
%%--------------------------------------------------------------------
handle_call({{connection_init, "", _Role}, Pid}, _From,
#state{session_cache = Cache} = State) ->
erlang:monitor(process, Pid),
Result = {ok, make_ref(), Cache},
{reply, Result, State};
handle_call({{connection_init, Trustedcerts, _Role}, Pid}, _From,
#state{certificate_db = Db,
session_cache = Cache} = State) ->
erlang:monitor(process, Pid),
Result =
try
{ok, Ref} = ssl_certificate_db:add_trusted_certs(Pid, Trustedcerts, Db),
{ok, Ref, Cache}
catch
_:Reason ->
{error, Reason}
end,
{reply, Result, State};
handle_call({{client_session_id, Host, Port, SslOpts, OwnCert}, _}, _,
#state{session_cache = Cache,
session_cache_cb = CacheCb} = State) ->
Id = ssl_session:id({Host, Port, SslOpts}, Cache, CacheCb, OwnCert),
{reply, Id, State};
handle_call({{server_session_id, Port, SuggestedSessionId, SslOpts, OwnCert}, _},
_, #state{session_cache_cb = CacheCb,
session_cache = Cache,
session_lifetime = LifeTime} = State) ->
Id = ssl_session:id(Port, SuggestedSessionId, SslOpts,
Cache, CacheCb, LifeTime, OwnCert),
{reply, Id, State};
handle_call({{cache_pem, File, LastWrite}, Pid}, _,
#state{certificate_db = Db} = State) ->
try ssl_certificate_db:cache_pem_file(Pid, File, LastWrite, Db) of
Result ->
{reply, Result, State}
catch
_:Reason ->
{reply, {error, Reason}, State}
end;
handle_call({{recache_pem, File, LastWrite}, Pid}, From,
#state{certificate_db = Db} = State) ->
ssl_certificate_db:uncache_pem_file(File, Db),
cast({recache_pem, File, LastWrite, Pid, From}),
{noreply, State}.
%%--------------------------------------------------------------------
-spec handle_cast(msg(), #state{}) -> {noreply, #state{}}.
%% Possible return values not used now.
%% | {noreply, #state{}, timeout()} |
%% {stop, reason(), #state{}}.
%%
%% Description: Handling cast messages
%%--------------------------------------------------------------------
handle_cast({register_session, Host, Port, Session},
#state{session_cache = Cache,
session_cache_cb = CacheCb} = State) ->
TimeStamp = calendar:datetime_to_gregorian_seconds({date(), time()}),
NewSession = Session#session{time_stamp = TimeStamp},
CacheCb:update(Cache, {{Host, Port},
NewSession#session.session_id}, NewSession),
{noreply, State};
handle_cast({register_session, Port, Session},
#state{session_cache = Cache,
session_cache_cb = CacheCb} = State) ->
TimeStamp = calendar:datetime_to_gregorian_seconds({date(), time()}),
NewSession = Session#session{time_stamp = TimeStamp},
CacheCb:update(Cache, {Port, NewSession#session.session_id}, NewSession),
{noreply, State};
handle_cast({invalidate_session, Host, Port,
#session{session_id = ID} = Session},
#state{session_cache = Cache,
session_cache_cb = CacheCb} = State) ->
CacheCb:update(Cache, {{Host, Port}, ID}, Session#session{is_resumable = false}),
timer:apply_after(?CLEAN_SESSION_DB, CacheCb, delete, {{Host, Port}, ID}),
{noreply, State};
handle_cast({invalidate_session, Port, #session{session_id = ID} = Session},
#state{session_cache = Cache,
session_cache_cb = CacheCb} = State) ->
CacheCb:update(Cache, {Port, ID}, Session#session{is_resumable = false}),
timer:apply_after(?CLEAN_SESSION_DB, CacheCb, delete, {Port, ID}),
{noreply, State};
handle_cast({recache_pem, File, LastWrite, Pid, From},
#state{certificate_db = [_, FileToRefDb, _]} = State0) ->
case ssl_certificate_db:lookup(File, FileToRefDb) of
undefined ->
{reply, Msg, State} =
handle_call({{cache_pem, File, LastWrite}, Pid}, From, State0),
gen_server:reply(From, Msg),
{noreply, State};
_ -> %% Send message to self letting cleanup messages be handled
%% first so that no reference to the old version of file
%% exists when we cache the new one.
cast({recache_pem, File, LastWrite, Pid, From}),
{noreply, State0}
end.
%%--------------------------------------------------------------------
-spec handle_info(msg(), #state{}) -> {noreply, #state{}}.
%% Possible return values not used now.
%% |{noreply, #state{}, timeout()} |
%% {stop, reason(), #state{}}.
%%
%% Description: Handling all non call/cast messages
%%--------------------------------------------------------------------
handle_info(validate_sessions, #state{session_cache_cb = CacheCb,
session_cache = Cache,
session_lifetime = LifeTime
} = State) ->
Timer = erlang:send_after(?SESSION_VALIDATION_INTERVAL,
self(), validate_sessions),
start_session_validator(Cache, CacheCb, LifeTime),
{noreply, State#state{session_validation_timer = Timer}};
handle_info({'EXIT', _, _}, State) ->
%% Session validator died!! Do we need to take any action?
%% maybe error log
{noreply, State};
handle_info({'DOWN', _Ref, _Type, _Pid, ecacertfile}, State) ->
{noreply, State};
handle_info({'DOWN', _Ref, _Type, Pid, shutdown}, State) ->
handle_info({remove_trusted_certs, Pid}, State);
handle_info({'DOWN', _Ref, _Type, Pid, _Reason}, State) ->
erlang:send_after(?CERTIFICATE_CACHE_CLEANUP, self(),
{remove_trusted_certs, Pid}),
{noreply, State};
handle_info({remove_trusted_certs, Pid},
#state{certificate_db = Db} = State) ->
ssl_certificate_db:remove_trusted_certs(Pid, Db),
{noreply, State};
handle_info(_Info, State) ->
{noreply, State}.
%%--------------------------------------------------------------------
-spec terminate(reason(), #state{}) -> term().
%%
%% Description: This function is called by a gen_server when it is about to
%% terminate. It should be the opposite of Module:init/1 and do any necessary
%% cleaning up. When it returns, the gen_server terminates with Reason.
%% The return value is ignored.
%%--------------------------------------------------------------------
terminate(_Reason, #state{certificate_db = Db,
session_cache = SessionCache,
session_cache_cb = CacheCb,
session_validation_timer = Timer}) ->
erlang:cancel_timer(Timer),
ssl_certificate_db:remove(Db),
CacheCb:terminate(SessionCache),
ok.
%%--------------------------------------------------------------------
-spec code_change(term(), #state{}, list()) -> {ok, #state{}}.
%%
%% Description: Convert process state when code is changed
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
call(Msg) ->
gen_server:call(?MODULE, {Msg, self()}, infinity).
cast(Msg) ->
gen_server:cast(?MODULE, Msg).
validate_session(Host, Port, Session, LifeTime) ->
case ssl_session:valid_session(Session, LifeTime) of
true ->
ok;
false ->
invalidate_session(Host, Port, Session)
end.
validate_session(Port, Session, LifeTime) ->
case ssl_session:valid_session(Session, LifeTime) of
true ->
ok;
false ->
invalidate_session(Port, Session)
end.
start_session_validator(Cache, CacheCb, LifeTime) ->
spawn_link(?MODULE, init_session_validator,
[[Cache, CacheCb, LifeTime]]).
init_session_validator([Cache, CacheCb, LifeTime]) ->
CacheCb:foldl(fun session_validation/2,
LifeTime, Cache).
session_validation({{{Host, Port}, _}, Session}, LifeTime) ->
validate_session(Host, Port, Session, LifeTime),
LifeTime;
session_validation({{Port, _}, Session}, LifeTime) ->
validate_session(Port, Session, LifeTime),
LifeTime.
cache_pem_file(File, LastWrite) ->
case ssl_certificate_db:lookup_cached_certs(File) of
[{_, {Mtime, Content}}] ->
case LastWrite of
Mtime ->
{ok, Content};
_ ->
call({recache_pem, File, LastWrite})
end;
[] ->
call({cache_pem, File, LastWrite})
end.
