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
|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2015-2018. 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: Simple default CRL cache
%%----------------------------------------------------------------------
-module(ssl_crl_cache).
-include("ssl_internal.hrl").
-include_lib("public_key/include/public_key.hrl").
-behaviour(ssl_crl_cache_api).
-export_type([crl_src/0, uri/0]).
-type crl_src() :: {file, file:filename()} | {der, public_key:der_encoded()}.
-type uri() :: uri_string:uri_string().
-export([lookup/3, select/2, fresh_crl/2]).
-export([insert/1, insert/2, delete/1]).
%%====================================================================
%% Cache callback API
%%====================================================================
lookup(#'DistributionPoint'{distributionPoint = {fullName, Names}},
_Issuer,
CRLDbInfo) ->
get_crls(Names, CRLDbInfo);
lookup(_,_,_) ->
not_available.
select(Issuer, {{_Cache, Mapping},_}) ->
case ssl_pkix_db:lookup(Issuer, Mapping) of
undefined ->
[];
CRLs ->
CRLs
end.
fresh_crl(#'DistributionPoint'{distributionPoint = {fullName, Names}}, CRL) ->
case get_crls(Names, undefined) of
not_available ->
CRL;
[NewCRL] ->
NewCRL
end.
%%====================================================================
%% API
%%====================================================================
insert(CRLs) ->
insert(?NO_DIST_POINT, CRLs).
insert(URI, {file, File}) when is_list(URI) ->
case file:read_file(File) of
{ok, PemBin} ->
PemEntries = public_key:pem_decode(PemBin),
CRLs = [ CRL || {'CertificateList', CRL, not_encrypted}
<- PemEntries],
do_insert(URI, CRLs);
Error ->
Error
end;
insert(URI, {der, CRLs}) ->
do_insert(URI, CRLs).
delete({file, File}) ->
case file:read_file(File) of
{ok, PemBin} ->
PemEntries = public_key:pem_decode(PemBin),
CRLs = [ CRL || {'CertificateList', CRL, not_encrypted}
<- PemEntries],
ssl_manager:delete_crls({?NO_DIST_POINT, CRLs});
Error ->
Error
end;
delete({der, CRLs}) ->
ssl_manager:delete_crls({?NO_DIST_POINT, CRLs});
delete(URI) ->
case uri_string:normalize(URI, [return_map]) of
#{scheme := "http", path := Path} ->
ssl_manager:delete_crls(string:trim(Path, leading, "/"));
_ ->
{error, {only_http_distribution_points_supported, URI}}
end.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
do_insert(URI, CRLs) ->
case uri_string:normalize(URI, [return_map]) of
#{scheme := "http", path := Path} ->
ssl_manager:insert_crls(string:trim(Path, leading, "/"), CRLs);
_ ->
{error, {only_http_distribution_points_supported, URI}}
end.
get_crls([], _) ->
not_available;
get_crls([{uniformResourceIdentifier, "http"++_ = URL} | Rest],
CRLDbInfo) ->
case cache_lookup(URL, CRLDbInfo) of
[] ->
handle_http(URL, Rest, CRLDbInfo);
CRLs ->
CRLs
end;
get_crls([ _| Rest], CRLDbInfo) ->
%% unsupported CRL location
get_crls(Rest, CRLDbInfo).
http_lookup(URL, Rest, CRLDbInfo, Timeout) ->
case application:ensure_started(inets) of
ok ->
http_get(URL, Rest, CRLDbInfo, Timeout);
_ ->
get_crls(Rest, CRLDbInfo)
end.
http_get(URL, Rest, CRLDbInfo, Timeout) ->
case httpc:request(get, {URL, [{"connection", "close"}]},
[{timeout, Timeout}], [{body_format, binary}]) of
{ok, {_Status, _Headers, Body}} ->
case Body of
<<"-----BEGIN", _/binary>> ->
Pem = public_key:pem_decode(Body),
lists:filtermap(fun({'CertificateList',
CRL, not_encrypted}) ->
{true, CRL};
(_) ->
false
end, Pem);
_ ->
try public_key:der_decode('CertificateList', Body) of
_ ->
[Body]
catch
_:_ ->
get_crls(Rest, CRLDbInfo)
end
end;
{error, _Reason} ->
get_crls(Rest, CRLDbInfo)
end.
cache_lookup(_, undefined) ->
[];
cache_lookup(URL, {{Cache, _}, _}) ->
#{path := Path} = uri_string:normalize(URL, [return_map]),
case ssl_pkix_db:lookup(string:trim(Path, leading, "/"), Cache) of
undefined ->
[];
CRLs ->
CRLs
end.
handle_http(URI, Rest, {_, [{http, Timeout}]} = CRLDbInfo) ->
CRLs = http_lookup(URI, Rest, CRLDbInfo, Timeout),
%% Uncomment to improve performance, but need to
%% implement cache limit and or cleaning to prevent
%% DoS attack possibilities
%%insert(URI, {der, CRLs}),
CRLs;
handle_http(_, Rest, CRLDbInfo) ->
get_crls(Rest, CRLDbInfo).
|
