1 files changed, 154 insertions, 0 deletions
diff --git a/src/libcharon/plugins/addrblock/addrblock_narrow.c b/src/libcharon/plugins/addrblock/addrblock_narrow.c
new file mode 100644
index 000000000..f85fa78d6
--- /dev/null
+++ b/src/libcharon/plugins/addrblock/addrblock_narrow.c
@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ * Copyright (C) 2009 Andreas Steffen
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "addrblock_narrow.h"
+
+#include <daemon.h>
+#include <credentials/certificates/x509.h>
+
+typedef struct private_addrblock_narrow_t private_addrblock_narrow_t;
+
+/**
+ * Private data of an addrblock_narrow_t object.
+ */
+struct private_addrblock_narrow_t {
+
+	/**
+	 * Public addrblock_narrow_t interface.
+	 */
+	addrblock_narrow_t public;
+};
+
+/**
+ * Check if the negotiated TS list is acceptable by X509 ipAddrBlock constraints
+ */
+static bool check_constraints(ike_sa_t *ike_sa, linked_list_t *list)
+{
+	auth_cfg_t *auth;
+	enumerator_t *auth_enum;
+	certificate_t *cert = NULL;
+
+	auth_enum = ike_sa->create_auth_cfg_enumerator(ike_sa, FALSE);
+	while (auth_enum->enumerate(auth_enum, &auth))
+	{
+		cert = auth->get(auth, AUTH_HELPER_SUBJECT_CERT);
+		if (cert)
+		{
+			break;
+		}
+	}
+	auth_enum->destroy(auth_enum);
+
+	if (cert && cert->get_type(cert) == CERT_X509)
+	{
+		x509_t *x509 = (x509_t*)cert;
+
+		if (x509->get_flags(x509) & X509_IP_ADDR_BLOCKS)
+		{
+			enumerator_t *enumerator, *block_enum;
+			traffic_selector_t *ts, *block_ts;
+
+			DBG1(DBG_IKE, "checking certificate-based traffic selector "
+						  "constraints [RFC 3779]");
+			enumerator = list->create_enumerator(list);
+			while (enumerator->enumerate(enumerator, &ts))
+			{
+				bool contained = FALSE;
+
+				block_enum = x509->create_ipAddrBlock_enumerator(x509);
+				while (block_enum->enumerate(block_enum, &block_ts))
+				{
+					if (ts->is_contained_in(ts, block_ts))
+					{
+						DBG1(DBG_IKE, "  TS %R is contained in address block"
+									  " constraint %R", ts, block_ts);
+						contained = TRUE;
+						break;
+					}
+				}
+				block_enum->destroy(block_enum);
+
+				if (!contained)
+				{
+					DBG1(DBG_IKE, "  TS %R is not contained in any"
+								  " address block constraint", ts);
+					enumerator->destroy(enumerator);
+					return FALSE;
+				}
+			}
+			enumerator->destroy(enumerator);
+		}
+	}
+	return TRUE;
+}
+
+/**
+ * Delete all traffic selectors in a list
+ */
+static void flush_ts_list(linked_list_t *list)
+{
+	traffic_selector_t *ts;
+
+	while (list->remove_last(list, (void**)&ts) == SUCCESS)
+	{
+		ts->destroy(ts);
+	}
+}
+
+METHOD(listener_t, narrow, bool,
+	private_addrblock_narrow_t *this, ike_sa_t *ike_sa, child_sa_t *child_sa,
+	narrow_hook_t type, linked_list_t *local, linked_list_t *remote)
+{
+	switch (type)
+	{
+		case NARROW_RESPONDER:
+		case NARROW_INITIATOR_POST_AUTH:
+		case NARROW_INITIATOR_POST_NOAUTH:
+			if (!check_constraints(ike_sa, remote))
+			{
+				flush_ts_list(local);
+				flush_ts_list(remote);
+			}
+			break;
+		default:
+			break;
+	}
+	return TRUE;
+}
+
+METHOD(addrblock_narrow_t, destroy, void,
+	private_addrblock_narrow_t *this)
+{
+	free(this);
+}
+
+/**
+ * See header
+ */
+addrblock_narrow_t *addrblock_narrow_create()
+{
+	private_addrblock_narrow_t *this;
+
+	INIT(this,
+		.public = {
+			.listener.narrow = _narrow,
+			.destroy = _destroy,
+		},
+	);
+
+	return &this->public;
+}