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
|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2007-2012. 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: Handles ssl sessions
%%----------------------------------------------------------------------
-module(ssl_session).
-include("ssl_handshake.hrl").
-include("ssl_internal.hrl").
%% Internal application API
-export([is_new/2, client_id/4, server_id/6, valid_session/2]).
-define('24H_in_sec', 8640).
-type seconds() :: integer().
%%--------------------------------------------------------------------
-spec is_new(session_id(), session_id()) -> boolean().
%%
%% Description: Checks if the session id decided by the server is a
%% new or resumed sesion id.
%%--------------------------------------------------------------------
is_new(<<>>, _) ->
true;
is_new(SessionId, SessionId) ->
false;
is_new(_ClientSuggestion, _ServerDecision) ->
true.
%%--------------------------------------------------------------------
-spec client_id({host(), inet:port_number(), #ssl_options{}}, db_handle(), atom(),
undefined | binary()) -> binary().
%%
%% Description: Should be called by the client side to get an id
%% for the client hello message.
%%--------------------------------------------------------------------
client_id(ClientInfo, Cache, CacheCb, OwnCert) ->
case select_session(ClientInfo, Cache, CacheCb, OwnCert) of
no_session ->
<<>>;
SessionId ->
SessionId
end.
-spec valid_session(#session{}, seconds()) -> boolean().
%%
%% Description: Check that the session has not expired
%%--------------------------------------------------------------------
valid_session(#session{time_stamp = TimeStamp}, LifeTime) ->
Now = calendar:datetime_to_gregorian_seconds({date(), time()}),
Now - TimeStamp < LifeTime.
server_id(Port, <<>>, _SslOpts, _Cert, _, _) ->
{ssl_manager:new_session_id(Port), undefined};
server_id(Port, SuggestedId,
#ssl_options{reuse_sessions = ReuseEnabled,
reuse_session = ReuseFun},
Cert, Cache, CacheCb) ->
LifeTime = case application:get_env(ssl, session_lifetime) of
{ok, Time} when is_integer(Time) -> Time;
_ -> ?'24H_in_sec'
end,
case is_resumable(SuggestedId, Port, ReuseEnabled,ReuseFun,
Cache, CacheCb, LifeTime, Cert)
of
{true, Resumed} ->
{SuggestedId, Resumed};
{false, undefined} ->
{ssl_manager:new_session_id(Port), undefined}
end.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
select_session({_, _, #ssl_options{reuse_sessions=false}}, _Cache, _CacheCb, _OwnCert) ->
no_session;
select_session({HostIP, Port, SslOpts}, Cache, CacheCb, OwnCert) ->
Sessions = CacheCb:select_session(Cache, {HostIP, Port}),
select_session(Sessions, SslOpts, OwnCert).
select_session([], _, _) ->
no_session;
select_session(Sessions, #ssl_options{ciphers = Ciphers}, OwnCert) ->
IsNotResumable =
fun([_Id, Session]) ->
not (resumable(Session#session.is_resumable) andalso
lists:member(Session#session.cipher_suite, Ciphers)
andalso (OwnCert == Session#session.own_certificate))
end,
case lists:dropwhile(IsNotResumable, Sessions) of
[] -> no_session;
[[Id, _]|_] -> Id
end.
is_resumable(_, _, false, _, _, _, _, _) ->
{false, undefined};
is_resumable(SuggestedSessionId, Port, true, ReuseFun, Cache,
CacheCb, SecondLifeTime, OwnCert) ->
case CacheCb:lookup(Cache, {Port, SuggestedSessionId}) of
#session{cipher_suite = CipherSuite,
own_certificate = SessionOwnCert,
compression_method = Compression,
is_resumable = IsResumable,
peer_certificate = PeerCert} = Session ->
case resumable(IsResumable)
andalso (OwnCert == SessionOwnCert)
andalso valid_session(Session, SecondLifeTime)
andalso ReuseFun(SuggestedSessionId, PeerCert,
Compression, CipherSuite)
of
true -> {true, Session};
false -> {false, undefined}
end;
undefined ->
{false, undefined}
end.
resumable(new) ->
false;
resumable(IsResumable) ->
IsResumable.
|
