%%
%% %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).
