Moved X509 ipAddrBlock checking to the addrblock plugin

5 files changed, 216 insertions, 61 deletions

diff --git a/src/libcharon/plugins/addrblock/Makefile.am b/src/libcharon/plugins/addrblock/Makefile.am
index d844674ff..50d0457f8 100644
--- a/src/libcharon/plugins/addrblock/Makefile.am
+++ b/src/libcharon/plugins/addrblock/Makefile.am
@@ -12,6 +12,7 @@ endif
 
 libstrongswan_addrblock_la_SOURCES = \
 	addrblock_plugin.h addrblock_plugin.c \
+	addrblock_narrow.h addrblock_narrow.c \
 	addrblock_validator.h addrblock_validator.c
 
 libstrongswan_addrblock_la_LDFLAGS = -module -avoid-version
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;
+}
diff --git a/src/libcharon/plugins/addrblock/addrblock_narrow.h b/src/libcharon/plugins/addrblock/addrblock_narrow.h
new file mode 100644
index 000000000..9ab32e671
--- /dev/null
+++ b/src/libcharon/plugins/addrblock/addrblock_narrow.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * 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.
+ */
+
+/**
+ * @defgroup addrblock_narrow addrblock_narrow
+ * @{ @ingroup addrblock
+ */
+
+#ifndef ADDRBLOCK_NARROW_H_
+#define ADDRBLOCK_NARROW_H_
+
+#include <bus/listeners/listener.h>
+
+typedef struct addrblock_narrow_t addrblock_narrow_t;
+
+/**
+ * Listener that checks traffic selectors against addrblock constraints.
+ */
+struct addrblock_narrow_t {
+
+	/**
+	 * Implements listener_t.
+	 */
+	listener_t listener;
+
+	/**
+	 * Destroy a addrblock_narrow_t.
+	 */
+	void (*destroy)(addrblock_narrow_t *this);
+};
+
+/**
+ * Create a addrblock_narrow instance.
+ */
+addrblock_narrow_t *addrblock_narrow_create();
+
+#endif /** ADDRBLOCK_NARROW_H_ @}*/
diff --git a/src/libcharon/plugins/addrblock/addrblock_plugin.c b/src/libcharon/plugins/addrblock/addrblock_plugin.c
index 6c1ef73e4..1c407035d 100644
--- a/src/libcharon/plugins/addrblock/addrblock_plugin.c
+++ b/src/libcharon/plugins/addrblock/addrblock_plugin.c
@@ -15,8 +15,10 @@
 
 #include "addrblock_plugin.h"
 
-#include <library.h>
+#include <daemon.h>
+
 #include "addrblock_validator.h"
+#include "addrblock_narrow.h"
 
 typedef struct private_addrblock_plugin_t private_addrblock_plugin_t;
 
@@ -34,12 +36,19 @@ struct private_addrblock_plugin_t {
 	 * Validator implementation instance.
 	 */
 	addrblock_validator_t *validator;
+
+	/**
+	 * Listener to check TS list
+	 */
+	addrblock_narrow_t *narrower;
 };
 
 METHOD(plugin_t, destroy, void,
 	private_addrblock_plugin_t *this)
 {
+	charon->bus->remove_listener(charon->bus, &this->narrower->listener);
 	lib->credmgr->remove_validator(lib->credmgr, &this->validator->validator);
+	this->narrower->destroy(this->narrower);
 	this->validator->destroy(this->validator);
 	free(this);
 }
@@ -54,8 +63,10 @@ plugin_t *addrblock_plugin_create()
 	INIT(this,
 		.public.plugin.destroy = _destroy,
 		.validator = addrblock_validator_create(),
+		.narrower = addrblock_narrow_create(),
 	);
 	lib->credmgr->add_validator(lib->credmgr, &this->validator->validator);
+	charon->bus->add_listener(charon->bus, &this->narrower->listener);
 
 	return &this->public.plugin;
 }
diff --git a/src/libcharon/sa/tasks/child_create.c b/src/libcharon/sa/tasks/child_create.c
index 992811040..1113e473b 100644
--- a/src/libcharon/sa/tasks/child_create.c
+++ b/src/libcharon/sa/tasks/child_create.c
@@ -438,66 +438,6 @@ static status_t select_and_install(private_child_create_t *this,
 		}
 	}
 
-	/* check for any certificate-based IP address block constraints */
-	if (this->mode == MODE_BEET || this->mode == MODE_TUNNEL)
-	{
-		auth_cfg_t *auth;
-		enumerator_t *auth_enum;
-		certificate_t *cert = NULL;
-
-		auth_enum = this->ike_sa->create_auth_cfg_enumerator(this->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 = other_ts->create_enumerator(other_ts);
-				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 FAILED;
-					}
-				}
-				enumerator->destroy(enumerator);
-			}
-		}
-	}
-
 	this->child_sa->set_state(this->child_sa, CHILD_INSTALLING);
 	this->child_sa->set_ipcomp(this->child_sa, this->ipcomp);
 	this->child_sa->set_mode(this->child_sa, this->mode);