added support if the IETF port filter attribute

2 files changed, 340 insertions, 0 deletions

diff --git a/src/libimcv/ietf/ietf_attr_port_filter.c b/src/libimcv/ietf/ietf_attr_port_filter.c
new file mode 100644
index 000000000..975aa46ac
--- /dev/null
+++ b/src/libimcv/ietf/ietf_attr_port_filter.c
@@ -0,0 +1,266 @@
+/*
+ * Copyright (C) 2011 Andreas Steffen, HSR 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 "ietf_attr_port_filter.h"
+
+#include <pa_tnc/pa_tnc_msg.h>
+#include <bio/bio_writer.h>
+#include <bio/bio_reader.h>
+#include <utils/linked_list.h>
+#include <debug.h>
+
+
+typedef struct private_ietf_attr_port_filter_t private_ietf_attr_port_filter_t;
+typedef struct port_entry_t port_entry_t;
+
+/**
+ * Port Filter entry
+ */
+struct port_entry_t {
+	bool      blocked;
+	u_int8_t  protocol;
+	u_int16_t port;
+};
+
+/**
+ * PA-TNC Port Filter Type  (see section 4.2.6 of RFC 5792)
+ *
+ *                        1                   2                   3
+ *    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |   Reserved  |B|    Protocol   |         Port Number           |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |   Reserved  |B|    Protocol   |         Port Number           |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+#define PORT_FILTER_ENTRY_SIZE	4
+
+/**
+ * Private data of an ietf_attr_port_filter_t object.
+ */
+struct private_ietf_attr_port_filter_t {
+
+	/**
+	 * Public members of ietf_attr_port_filter_t
+	 */
+	ietf_attr_port_filter_t public;
+
+	/**
+	 * Attribute vendor ID
+	 */
+	pen_t vendor_id;
+
+	/**
+	 * Attribute type
+	 */
+	u_int32_t type;
+
+	/**
+	 * Attribute value
+	 */
+	chunk_t value;
+
+	/**
+	 * Noskip flag
+	 */
+	bool noskip_flag;
+
+	/**
+	 * List of Port Filter entries
+	 */
+	linked_list_t *ports;
+};
+
+METHOD(pa_tnc_attr_t, get_vendor_id, pen_t,
+	private_ietf_attr_port_filter_t *this)
+{
+	return this->vendor_id;
+}
+
+METHOD(pa_tnc_attr_t, get_type, u_int32_t,
+	private_ietf_attr_port_filter_t *this)
+{
+	return this->type;
+}
+
+METHOD(pa_tnc_attr_t, get_value, chunk_t,
+	private_ietf_attr_port_filter_t *this)
+{
+	return this->value;
+}
+
+METHOD(pa_tnc_attr_t, get_noskip_flag, bool,
+	private_ietf_attr_port_filter_t *this)
+{
+	return this->noskip_flag;
+}
+
+METHOD(pa_tnc_attr_t, set_noskip_flag,void,
+	private_ietf_attr_port_filter_t *this, bool noskip)
+{
+	this->noskip_flag = noskip;
+}
+
+METHOD(pa_tnc_attr_t, build, void,
+	private_ietf_attr_port_filter_t *this)
+{
+	bio_writer_t *writer;
+	enumerator_t *enumerator;
+	port_entry_t *entry;
+
+	writer = bio_writer_create(this->ports->get_count(this->ports) *
+							   PORT_FILTER_ENTRY_SIZE);
+
+	enumerator = this->ports->create_enumerator(this->ports);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		writer->write_uint8 (writer, entry->blocked ? 0x01 : 0x00);
+		writer->write_uint8 (writer, entry->protocol);
+		writer->write_uint16(writer, entry->port);
+	}
+	enumerator->destroy(enumerator);
+
+	this->value = chunk_clone(writer->get_buf(writer));
+	writer->destroy(writer);
+}
+
+METHOD(pa_tnc_attr_t, process, status_t,
+	private_ietf_attr_port_filter_t *this)
+{
+	bio_reader_t *reader;
+	port_entry_t *entry;
+	u_int8_t blocked;
+
+	if (this->value.len % PORT_FILTER_ENTRY_SIZE)
+	{
+		return FAILED;
+	}
+	reader = bio_reader_create(this->value);
+
+	while (reader->remaining(reader))
+	{
+		entry = malloc_thing(port_entry_t);	
+		reader->read_uint8 (reader, &blocked);
+		entry->blocked = blocked & 0x01;
+		reader->read_uint8 (reader, &entry->protocol);
+		reader->read_uint16(reader, &entry->port);
+		this->ports->insert_last(this->ports, entry);
+	}
+	reader->destroy(reader);
+
+	return SUCCESS;	
+}
+
+METHOD(pa_tnc_attr_t, destroy, void,
+	private_ietf_attr_port_filter_t *this)
+{
+	this->ports->destroy_function(this->ports, free);
+	free(this->value.ptr);
+	free(this);
+}
+
+METHOD(ietf_attr_port_filter_t, add_port, void,
+	private_ietf_attr_port_filter_t *this, bool blocked, u_int8_t protocol,
+	u_int16_t port)
+{
+	port_entry_t *entry;
+
+	entry = malloc_thing(port_entry_t);
+	entry->blocked = blocked;
+	entry->protocol = protocol;
+	entry->port = port;
+	this->ports->insert_last(this->ports, entry);	
+}
+
+/**
+ * Enumerate port filter entries
+ */
+static bool port_filter(void *null, port_entry_t **entry,
+						bool *blocked, void *i2, u_int8_t *protocol, void *i3,
+						u_int16_t *port)
+{
+	*blocked = (*entry)->blocked;
+	*protocol = (*entry)->protocol;
+	*port = (*entry)->port;
+	return TRUE;
+}
+
+METHOD(ietf_attr_port_filter_t, create_port_enumerator, enumerator_t*,
+	private_ietf_attr_port_filter_t *this)
+{
+	return enumerator_create_filter(this->ports->create_enumerator(this->ports),
+					(void*)port_filter, NULL, NULL);
+}
+
+/**
+ * Described in header.
+ */
+pa_tnc_attr_t *ietf_attr_port_filter_create(void)
+{
+	private_ietf_attr_port_filter_t *this;
+
+	INIT(this,
+		.public = {
+			.pa_tnc_attribute = {
+				.get_vendor_id = _get_vendor_id,
+				.get_type = _get_type,
+				.get_value = _get_value,
+				.get_noskip_flag = _get_noskip_flag,
+				.set_noskip_flag = _set_noskip_flag,
+				.build = _build,
+				.process = _process,
+				.destroy = _destroy,
+			},
+			.add_port = _add_port,
+			.create_port_enumerator = _create_port_enumerator,
+		},
+		.vendor_id = PEN_IETF,
+		.type = IETF_ATTR_PORT_FILTER,
+		.ports = linked_list_create(),
+	);
+
+	return &this->public.pa_tnc_attribute;
+}
+
+/**
+ * Described in header.
+ */
+pa_tnc_attr_t *ietf_attr_port_filter_create_from_data(chunk_t data)
+{
+	private_ietf_attr_port_filter_t *this;
+
+	INIT(this,
+		.public = {
+			.pa_tnc_attribute = {
+				.get_vendor_id = _get_vendor_id,
+				.get_type = _get_type,
+				.get_value = _get_value,
+				.build = _build,
+				.process = _process,
+				.destroy = _destroy,
+			},
+			.add_port = _add_port,
+			.create_port_enumerator = _create_port_enumerator,
+		},
+		.vendor_id = PEN_IETF,
+		.type = IETF_ATTR_PORT_FILTER,
+		.value = chunk_clone(data),
+		.ports = linked_list_create(),
+	);
+
+	return &this->public.pa_tnc_attribute;
+}
+
+
diff --git a/src/libimcv/ietf/ietf_attr_port_filter.h b/src/libimcv/ietf/ietf_attr_port_filter.h
new file mode 100644
index 000000000..ad5553417
--- /dev/null
+++ b/src/libimcv/ietf/ietf_attr_port_filter.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2011 Andreas Steffen
+ * HSR 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.
+ */
+
+/**
+ * @defgroup ietf_attr_port_filtert ietf_attr_port_filter
+ * @{ @ingroup ietf_attr_port_filter
+ */
+
+#ifndef IETF_ATTR_PORT_FILTER_H_
+#define IETF_ATTR_PORT_FILTER_H_
+
+typedef struct ietf_attr_port_filter_t ietf_attr_port_filter_t;
+
+#include "ietf_attr.h"
+#include "pa_tnc/pa_tnc_attr.h"
+
+
+/**
+ * Class implementing the IETF PA-TNC Port Filter attribute.
+ *
+ */
+struct ietf_attr_port_filter_t {
+
+	/**
+	 * Public PA-TNC attribute interface
+	 */
+	pa_tnc_attr_t pa_tnc_attribute;
+
+	/**
+	 * Add a port entry
+	 *
+	 * @param blocked		TRUE if blocked, FALSE if allowed
+	 * @param protocol		IP protocol type
+	 * @param port			TCP/UDP port number
+	 */
+	void (*add_port)(ietf_attr_port_filter_t *this, bool blocked,
+					 u_int8_t protocol, u_int16_t port);
+
+	/**
+	 * Enumerates over all ports
+	 * Format:  bool *blocked, u_int8_t *protocol, u_int16_t *port
+	 *
+	 * @return				enumerator
+	 */
+	enumerator_t* (*create_port_enumerator)(ietf_attr_port_filter_t *this);
+
+};
+
+/**
+ * Creates an ietf_attr_port_filter_t object
+ *
+ */
+pa_tnc_attr_t* ietf_attr_port_filter_create(void);
+
+/**
+ * Creates an ietf_attr_port_filter_t object from received data
+ *
+ * @param value				unparsed attribute value
+ */
+pa_tnc_attr_t* ietf_attr_port_filter_create_from_data(chunk_t value);
+
+#endif /** IETF_ATTR_PORT_FILTER_H_ @}*/