Class representing an IPsec SA added

The IPsec SA also manages the respective ESP context.

4 files changed, 356 insertions, 2 deletions

diff --git a/src/libipsec/Android.mk b/src/libipsec/Android.mk
index c4cf92d39..2c1c1cc93 100644
--- a/src/libipsec/Android.mk
+++ b/src/libipsec/Android.mk
@@ -5,7 +5,8 @@ include $(CLEAR_VARS)
 LOCAL_SRC_FILES := \
 ipsec.c ipsec.h \
 esp_context.c esp_context.h \
-esp_packet.c esp_packet.h
+esp_packet.c esp_packet.h \
+ipsec_sa.c ipsec_sa.h
 
 # build libipsec ---------------------------------------------------------------
 
diff --git a/src/libipsec/Makefile.am b/src/libipsec/Makefile.am
index 128de7a1f..655849632 100644
--- a/src/libipsec/Makefile.am
+++ b/src/libipsec/Makefile.am
@@ -3,7 +3,8 @@ ipseclib_LTLIBRARIES = libipsec.la
 libipsec_la_SOURCES = \
 ipsec.c ipsec.h \
 esp_context.c esp_context.h \
-esp_packet.c esp_packet.h
+esp_packet.c esp_packet.h \
+ipsec_sa.c ipsec_sa.h
 
 libipsec_la_LIBADD =
 
diff --git a/src/libipsec/ipsec_sa.c b/src/libipsec/ipsec_sa.c
new file mode 100644
index 000000000..02fa81354
--- /dev/null
+++ b/src/libipsec/ipsec_sa.c
@@ -0,0 +1,212 @@
+/*
+ * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2012 Giuliano Grassi
+ * Copyright (C) 2012 Ralf Sager
+ * 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 "ipsec_sa.h"
+
+#include <library.h>
+#include <debug.h>
+
+typedef struct private_ipsec_sa_t private_ipsec_sa_t;
+
+/**
+ * Private additions to ipsec_sa_t.
+ */
+struct private_ipsec_sa_t {
+
+	/**
+	 * Public members
+	 */
+	ipsec_sa_t public;
+
+	/**
+	 * SPI of this SA
+	 */
+	u_int32_t spi;
+
+	/**
+	 * Source address
+	 */
+	host_t *src;
+
+	/**
+	 * Destination address
+	 */
+	host_t *dst;
+
+	/**
+	 * Protocol
+	 */
+	u_int8_t protocol;
+
+	/**
+	 * Reqid of this SA
+	 */
+	u_int32_t reqid;
+
+	/**
+	 * Lifetime configuration
+	 */
+	lifetime_cfg_t lifetime;
+
+	/**
+	 * IPsec mode
+	 */
+	ipsec_mode_t mode;
+
+	/**
+	 * TRUE if extended sequence numbers are used
+	 */
+	bool esn;
+
+	/**
+	 * TRUE if this is an inbound SA
+	 */
+	bool inbound;
+
+	/**
+	 * ESP context
+	 */
+	esp_context_t *esp_context;
+};
+
+METHOD(ipsec_sa_t, get_source, host_t*,
+	private_ipsec_sa_t *this)
+{
+	return this->src;
+}
+
+METHOD(ipsec_sa_t, get_destination, host_t*,
+	private_ipsec_sa_t *this)
+{
+	return this->dst;
+}
+
+METHOD(ipsec_sa_t, get_spi, u_int32_t,
+	private_ipsec_sa_t *this)
+{
+	return this->spi;
+}
+
+METHOD(ipsec_sa_t, get_reqid, u_int32_t,
+	private_ipsec_sa_t *this)
+{
+	return this->reqid;
+}
+
+METHOD(ipsec_sa_t, get_protocol, u_int8_t,
+	private_ipsec_sa_t *this)
+{
+	return this->protocol;
+}
+
+METHOD(ipsec_sa_t, get_lifetime, lifetime_cfg_t*,
+	private_ipsec_sa_t *this)
+{
+	return &this->lifetime;
+}
+
+METHOD(ipsec_sa_t, is_inbound, bool,
+	private_ipsec_sa_t *this)
+{
+	return this->inbound;
+}
+
+METHOD(ipsec_sa_t, get_esp_context, esp_context_t*,
+	private_ipsec_sa_t *this)
+{
+	return this->esp_context;
+}
+
+METHOD(ipsec_sa_t, destroy, void,
+	private_ipsec_sa_t *this)
+{
+	this->src->destroy(this->src);
+	this->dst->destroy(this->dst);
+	DESTROY_IF(this->esp_context);
+	free(this);
+}
+
+/**
+ * Described in header.
+ */
+ipsec_sa_t *ipsec_sa_create(u_int32_t spi, host_t *src, host_t *dst,
+		u_int8_t protocol, u_int32_t reqid, mark_t mark, u_int32_t tfc,
+		lifetime_cfg_t *lifetime, u_int16_t enc_alg, chunk_t enc_key,
+		u_int16_t int_alg, chunk_t int_key, ipsec_mode_t mode,
+		u_int16_t ipcomp, u_int16_t cpi, bool encap, bool esn, bool inbound,
+		traffic_selector_t *src_ts,	traffic_selector_t *dst_ts)
+{
+	private_ipsec_sa_t *this;
+
+	if (protocol != IPPROTO_ESP)
+	{
+		DBG1(DBG_ESP, "  IPsec SA: protocol not supported");
+		return NULL;
+	}
+	if (!encap)
+	{
+		DBG1(DBG_ESP, "  IPsec SA: only UDP encapsulation is supported");
+		return NULL;
+	}
+	if (esn)
+	{
+		DBG1(DBG_ESP, "  IPsec SA: ESN not supported");
+		return NULL;
+	}
+	if (ipcomp != IPCOMP_NONE)
+	{
+		DBG1(DBG_ESP, "  IPsec SA: compression not supported");
+		return NULL;
+	}
+	if (mode != MODE_TUNNEL)
+	{
+		DBG1(DBG_ESP, "  IPsec SA: unsupported mode");
+		return NULL;
+	}
+
+	INIT(this,
+		.public = {
+			.destroy = _destroy,
+			.get_source = _get_source,
+			.get_destination = _get_destination,
+			.get_spi = _get_spi,
+			.get_reqid = _get_reqid,
+			.get_protocol = _get_protocol,
+			.get_lifetime = _get_lifetime,
+			.is_inbound = _is_inbound,
+			.get_esp_context = _get_esp_context,
+		},
+		.spi = spi,
+		.src = src->clone(src),
+		.dst = dst->clone(dst),
+		.lifetime = *lifetime,
+		.protocol = protocol,
+		.reqid = reqid,
+		.mode = mode,
+		.esn = esn,
+		.inbound = inbound,
+	);
+
+	this->esp_context = esp_context_create(enc_alg, enc_key, int_alg, int_key,
+										   inbound);
+	if (!this->esp_context)
+	{
+		destroy(this);
+		return NULL;
+	}
+	return &this->public;
+}
diff --git a/src/libipsec/ipsec_sa.h b/src/libipsec/ipsec_sa.h
new file mode 100644
index 000000000..5cf559a38
--- /dev/null
+++ b/src/libipsec/ipsec_sa.h
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2012 Giuliano Grassi
+ * Copyright (C) 2012 Ralf Sager
+ * 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 ipsec_sa ipsec_sa
+ * @{ @ingroup libipsec
+ */
+
+#ifndef IPSEC_SA_H_
+#define IPSEC_SA_H_
+
+#include "esp_context.h"
+
+#include <library.h>
+#include <utils/host.h>
+#include <selectors/traffic_selector.h>
+#include <ipsec/ipsec_types.h>
+
+typedef struct ipsec_sa_t ipsec_sa_t;
+
+/**
+ * IPsec Security Association (SA)
+ */
+struct ipsec_sa_t {
+
+	/**
+	 * Get the source address for this SA
+	 *
+	 * @return			source address of this SA
+	 */
+	host_t *(*get_source)(ipsec_sa_t *this);
+
+	/**
+	 * Get the destination address for this SA
+	 *
+	 * @return			destination address of this SA
+	 */
+	host_t *(*get_destination)(ipsec_sa_t *this);
+
+	/**
+	 * Get the SPI for this SA
+	 *
+	 * @return			SPI of this SA
+	 */
+	u_int32_t (*get_spi)(ipsec_sa_t *this);
+
+	/**
+	 * Get the reqid of this SA
+	 *
+	 * @return			reqid of this SA
+	 */
+	u_int32_t (*get_reqid)(ipsec_sa_t *this);
+
+	/**
+	 * Get the protocol (e.g. IPPROTO_ESP) of this SA
+	 *
+	 * @return			protocol of this SA
+	 */
+	u_int8_t (*get_protocol)(ipsec_sa_t *this);
+
+	/**
+	 * Returns whether this SA is inbound or outbound
+	 *
+	 * @return			TRUE if inbound, FALSE if outbound
+	 */
+	bool (*is_inbound)(ipsec_sa_t *this);
+
+	/**
+	 * Get the lifetime information for this SA
+	 * Note that this information is always relative to the time when the
+	 * SA was installed (i.e. it is not adjusted over time)
+	 *
+	 * @return			lifetime of this SA
+	 */
+	lifetime_cfg_t *(*get_lifetime)(ipsec_sa_t *this);
+
+	/**
+	 * Get the ESP context for this SA
+	 *
+	 * @return			ESP context of this SA
+	 */
+	esp_context_t *(*get_esp_context)(ipsec_sa_t *this);
+
+	/**
+	 * Destroy an ipsec_sa_t
+	 */
+	void (*destroy)(ipsec_sa_t *this);
+
+};
+
+/**
+ * Create an ipsec_sa_t instance
+ *
+ * @param spi			SPI for this SA
+ * @param src			source address for this SA (gets cloned)
+ * @param dst			destination address for this SA (gets cloned)
+ * @param protocol		protocol for this SA (only ESP is supported)
+ * @param reqid			reqid for this SA
+ * @param mark			mark for this SA (ignored)
+ * @param tfc			Traffic Flow Confidentiality (currently not supported)
+ * @param lifetime		lifetime for this SA
+ * @param enc_alg		encryption algorithm for this SA
+ * @param enc_key		encryption key for this SA
+ * @param int_alg		integrity protection algorithm
+ * @param int_key		integrity protection key
+ * @param mode			mode for this SA (only tunnel mode is supported)
+ * @param ipcomp		IPcomp transform (not supported, use IPCOMP_NONE)
+ * @param cpi			CPI for IPcomp (ignored)
+ * @param encap			enable UDP encapsulation (must be TRUE)
+ * @param esn			Extended Sequence Numbers (currently not supported)
+ * @param inbound		TRUE if this is an inbound SA, FALSE otherwise
+ * @param src_ts		source traffic selector
+ * @param dst_ts		destination traffic selector
+ * @return				the IPsec SA, or NULL if the creation failed
+ */
+ipsec_sa_t *ipsec_sa_create(u_int32_t spi, host_t *src, host_t *dst,
+							u_int8_t protocol, u_int32_t reqid, mark_t mark,
+							u_int32_t tfc, lifetime_cfg_t *lifetime,
+							u_int16_t enc_alg, chunk_t enc_key,
+							u_int16_t int_alg, chunk_t int_key,
+							ipsec_mode_t mode, u_int16_t ipcomp, u_int16_t cpi,
+							bool encap, bool esn, bool inbound,
+							traffic_selector_t *src_ts,
+							traffic_selector_t *dst_ts);
+
+#endif /** IPSEC_SA_H_ @}*/