%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2015-2017. 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: CRL handling
%%----------------------------------------------------------------------
-module(ssl_crl).
-include("ssl_alert.hrl").
-include("ssl_internal.hrl").
-include_lib("public_key/include/public_key.hrl").
-export([trusted_cert_and_path/3]).
trusted_cert_and_path(CRL, {SerialNumber, Issuer},{_, {Db, DbRef}} = DbHandle) ->
case ssl_pkix_db:lookup_trusted_cert(Db, DbRef, SerialNumber, Issuer) of
undefined ->
trusted_cert_and_path(CRL, issuer_not_found, DbHandle);
{ok, {_, OtpCert}} ->
{ok, Root, Chain} = ssl_certificate:certificate_chain(OtpCert, Db, DbRef),
{ok, Root, lists:reverse(Chain)}
end;
trusted_cert_and_path(CRL, issuer_not_found, {CertPath, {Db, DbRef}}) ->
case find_issuer(CRL, {certpath,
[{Der, public_key:pkix_decode_cert(Der,otp)} || Der <- CertPath]}) of
{ok, OtpCert} ->
{ok, Root, Chain} = ssl_certificate:certificate_chain(OtpCert, Db, DbRef),
{ok, Root, lists:reverse(Chain)};
{error, issuer_not_found} ->
trusted_cert_and_path(CRL, issuer_not_found, {Db, DbRef})
end;
trusted_cert_and_path(CRL, issuer_not_found, {Db, DbRef} = DbInfo) ->
case find_issuer(CRL, DbInfo) of
{ok, OtpCert} ->
{ok, Root, Chain} = ssl_certificate:certificate_chain(OtpCert, Db, DbRef),
{ok, Root, lists:reverse(Chain)};
{error, issuer_not_found} ->
{error, unknown_ca}
end.
find_issuer(CRL, {certpath = Db, DbRef}) ->
Issuer = public_key:pkix_normalize_name(public_key:pkix_crl_issuer(CRL)),
IsIssuerFun =
fun({_Der,ErlCertCandidate}, Acc) ->
verify_crl_issuer(CRL, ErlCertCandidate, Issuer, Acc);
(_, Acc) ->
Acc
end,
find_issuer(IsIssuerFun, Db, DbRef);
find_issuer(CRL, {Db, DbRef}) ->
Issuer = public_key:pkix_normalize_name(public_key:pkix_crl_issuer(CRL)),
IsIssuerFun =
fun({_Key, {_Der,ErlCertCandidate}}, Acc) ->
verify_crl_issuer(CRL, ErlCertCandidate, Issuer, Acc);
(_, Acc) ->
Acc
end,
find_issuer(IsIssuerFun, Db, DbRef).
find_issuer(IsIssuerFun, certpath, Certs) ->
try lists:foldl(IsIssuerFun, issuer_not_found, Certs) of
issuer_not_found ->
{error, issuer_not_found}
catch
{ok, _} = Result ->
Result
end;
find_issuer(IsIssuerFun, extracted, CertsData) ->
Certs = [Entry || {decoded, Entry} <- CertsData],
try lists:foldl(IsIssuerFun, issuer_not_found, Certs) of
issuer_not_found ->
{error, issuer_not_found}
catch
{ok, _} = Result ->
Result
end;
find_issuer(IsIssuerFun, Db, _) ->
try ssl_pkix_db:foldl(IsIssuerFun, issuer_not_found, Db) of
issuer_not_found ->
{error, issuer_not_found}
catch
{ok, _} = Result ->
Result
end.
verify_crl_issuer(CRL, ErlCertCandidate, Issuer, NotIssuer) ->
TBSCert = ErlCertCandidate#'OTPCertificate'.tbsCertificate,
case public_key:pkix_normalize_name(TBSCert#'OTPTBSCertificate'.subject) of
Issuer ->
case public_key:pkix_crl_verify(CRL, ErlCertCandidate) of
true ->
throw({ok, ErlCertCandidate});
false ->
NotIssuer
end;
_ ->
NotIssuer
end.
