From 4e0a5e36b38e3f15ed8f7d700d26f2424a47111c Mon Sep 17 00:00:00 2001
From: Ingela Anderton Andin <ingela@erlang.org>
Date: Wed, 11 Feb 2015 14:53:10 +0100
Subject: ssl: Integrate public_key CRL verification with the ssl application

---
 lib/ssl/src/ssl_crl.erl | 82 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 lib/ssl/src/ssl_crl.erl

(limited to 'lib/ssl/src/ssl_crl.erl')

diff --git a/lib/ssl/src/ssl_crl.erl b/lib/ssl/src/ssl_crl.erl
new file mode 100644
index 0000000000..b8761f0601
--- /dev/null
+++ b/lib/ssl/src/ssl_crl.erl
@@ -0,0 +1,82 @@
+%%
+%% %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: 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, {Db, DbRef} = DbHandle) -> 
+    try find_issuer(CRL, DbHandle) of
+	OtpCert ->
+	    {ok, Root, Chain} = ssl_certificate:certificate_chain(OtpCert, Db, DbRef),
+	    {ok, Root, lists:reverse(Chain)}
+    catch
+	throw:_ ->
+	    {error, issuer_not_found}
+    end.
+
+find_issuer(CRL, {Db,_}) ->
+    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,
+    
+    try ssl_pkix_db:foldl(IsIssuerFun, issuer_not_found, Db) of
+	issuer_not_found ->
+	    {error, issuer_not_found}
+    catch 
+	{ok, IssuerCert}  ->
+	    IssuerCert
+    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;
+		_ ->
+		    NotIssuer
+	    end;
+	_ ->
+	    NotIssuer
+    end.
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