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-rw-r--r--lib/ssl/src/ssl_crl_cache.erl179
1 files changed, 179 insertions, 0 deletions
diff --git a/lib/ssl/src/ssl_crl_cache.erl b/lib/ssl/src/ssl_crl_cache.erl
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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2015-2015. 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: 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([lookup/2, select/2, fresh_crl/2]).
+-export([insert/1, insert/2, delete/1]).
+
+%%====================================================================
+%% Cache callback API
+%%====================================================================
+
+lookup(#'DistributionPoint'{distributionPoint={fullName, Names}},
+ 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, CRL) ->
+ case get_crls(DistributionPoint, 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 http_uri:parse(URI) of
+ {ok, {http, _, _ , _, Path,_}} ->
+ ssl_manager:delete_crls(string:strip(Path, left, $/));
+ _ ->
+ {error, {only_http_distribution_points_supported, URI}}
+ end.
+
+%%--------------------------------------------------------------------
+%%% Internal functions
+%%--------------------------------------------------------------------
+do_insert(URI, CRLs) ->
+ case http_uri:parse(URI) of
+ {ok, {http, _, _ , _, Path,_}} ->
+ ssl_manager:insert_crls(string:strip(Path, left, $/), 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, _}, _}) ->
+ {ok, {_, _, _ , _, Path,_}} = http_uri:parse(URL),
+ case ssl_pkix_db:lookup(string:strip(Path, left, $/), 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).
+