1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 20016-2017. 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.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%----------------------------------------------------------------------
%% Purpose: Manages ssl sessions and trusted certifacates
%%----------------------------------------------------------------------
-module(ssl_pem_cache).
-behaviour(gen_server).
%% Internal application API
-export([start_link/1,
start_link_dist/1,
name/1,
insert/1,
clear/0]).
% Spawn export
-export([init_pem_cache_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, {
pem_cache,
last_pem_check :: erlang:timestamp(),
clear :: integer()
}).
-define(CLEAR_PEM_CACHE, 120000).
-define(DEFAULT_MAX_SESSION_CACHE, 1000).
%%====================================================================
%% API
%%====================================================================
%%--------------------------------------------------------------------
-spec name(normal | dist) -> atom().
%%
%% Description: Returns the registered name of the ssl cache process
%% in the operation modes 'normal' and 'dist'.
%%--------------------------------------------------------------------
name(normal) ->
?MODULE;
name(dist) ->
list_to_atom(atom_to_list(?MODULE) ++ "dist").
%%--------------------------------------------------------------------
-spec start_link(list()) -> {ok, pid()} | ignore | {error, term()}.
%%
%% Description: Starts the ssl pem cache handler
%%--------------------------------------------------------------------
start_link(_) ->
CacheName = name(normal),
gen_server:start_link({local, CacheName},
?MODULE, [CacheName], []).
%%--------------------------------------------------------------------
-spec start_link_dist(list()) -> {ok, pid()} | ignore | {error, term()}.
%%
%% Description: Starts a special instance of the ssl manager to
%% be used by the erlang distribution. Note disables soft upgrade!
%%--------------------------------------------------------------------
start_link_dist(_) ->
DistCacheName = name(dist),
gen_server:start_link({local, DistCacheName},
?MODULE, [DistCacheName], []).
%%--------------------------------------------------------------------
-spec insert(binary()) -> {ok, term()} | {error, reason()}.
%%
%% Description: Cache a pem file and return its content.
%%--------------------------------------------------------------------
insert(File) ->
{ok, PemBin} = file:read_file(File),
Content = public_key:pem_decode(PemBin),
case bypass_cache() of
true ->
{ok, Content};
false ->
cast({cache_pem, File, Content}),
{ok, Content}
end.
%%--------------------------------------------------------------------
-spec clear() -> ok.
%%
%% Description: Clear the PEM cache
%%--------------------------------------------------------------------
clear() ->
%% Not supported for distribution at the moement, should it be?
put(ssl_pem_cache, name(normal)),
call(unconditionally_clear_pem_cache).
-spec invalidate_pem(File::binary()) -> ok.
invalidate_pem(File) ->
cast({invalidate_pem, File}).
%%====================================================================
%% 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([Name]) ->
put(ssl_pem_cache, Name),
process_flag(trap_exit, true),
PemCache = ssl_pkix_db:create_pem_cache(Name),
Interval = pem_check_interval(),
erlang:send_after(Interval, self(), clear_pem_cache),
{ok, #state{pem_cache = PemCache,
last_pem_check = os:timestamp(),
clear = Interval
}}.
%%--------------------------------------------------------------------
-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({unconditionally_clear_pem_cache, _},_,
#state{pem_cache = PemCache} = State) ->
ssl_pkix_db:clear(PemCache),
{reply, ok, 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({cache_pem, File, Content}, #state{pem_cache = Db} = State) ->
ssl_pkix_db:insert(File, Content, Db),
{noreply, State};
handle_cast({invalidate_pem, File}, #state{pem_cache = Db} = State) ->
ssl_pkix_db:remove(File, Db),
{noreply, State}.
%%--------------------------------------------------------------------
-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(clear_pem_cache, #state{pem_cache = PemCache,
clear = Interval,
last_pem_check = CheckPoint} = State) ->
NewCheckPoint = os:timestamp(),
start_pem_cache_validator(PemCache, CheckPoint),
erlang:send_after(Interval, self(), clear_pem_cache),
{noreply, State#state{last_pem_check = NewCheckPoint}};
handle_info(_Info, State) ->
{noreply, State}.
%%--------------------------------------------------------------------
-spec terminate(reason(), #state{}) -> ok.
%%
%% 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{}) ->
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(get(ssl_pem_cache), {Msg, self()}, infinity).
cast(Msg) ->
gen_server:cast(get(ssl_pem_cache), Msg).
start_pem_cache_validator(PemCache, CheckPoint) ->
spawn_link(?MODULE, init_pem_cache_validator,
[[get(ssl_pem_cache), PemCache, CheckPoint]]).
init_pem_cache_validator([CacheName, PemCache, CheckPoint]) ->
put(ssl_pem_cache, CacheName),
ssl_pkix_db:foldl(fun pem_cache_validate/2,
CheckPoint, PemCache).
pem_cache_validate({File, _}, CheckPoint) ->
case file:read_file_info(File, []) of
{ok, #file_info{mtime = Time}} ->
case is_before_checkpoint(Time, CheckPoint) of
true ->
ok;
false ->
invalidate_pem(File)
end;
_ ->
invalidate_pem(File)
end,
CheckPoint.
is_before_checkpoint(Time, CheckPoint) ->
calendar:datetime_to_gregorian_seconds(
calendar:now_to_datetime(CheckPoint)) -
calendar:datetime_to_gregorian_seconds(Time) > 0.
pem_check_interval() ->
case application:get_env(ssl, ssl_pem_cache_clean) of
{ok, Interval} when is_integer(Interval) ->
Interval;
_ ->
?CLEAR_PEM_CACHE
end.
bypass_cache() ->
case application:get_env(ssl, bypass_pem_cache) of
{ok, Bool} when is_boolean(Bool) ->
Bool;
_ ->
false
end.
|
