Separated libcharon/sa directory with ikev1 and ikev2 subfolders

1 files changed, 947 insertions, 0 deletions

diff --git a/src/libcharon/sa/ikev1/tasks/quick_mode.c b/src/libcharon/sa/ikev1/tasks/quick_mode.c
new file mode 100644
index 000000000..9e71642af
--- /dev/null
+++ b/src/libcharon/sa/ikev1/tasks/quick_mode.c
@@ -0,0 +1,947 @@
+/*
+ * Copyright (C) 2011 Martin Willi
+ * Copyright (C) 2011 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.
+ */
+
+#include "quick_mode.h"
+
+#include <string.h>
+
+#include <daemon.h>
+#include <sa/ikev1/keymat_v1.h>
+#include <encoding/payloads/sa_payload.h>
+#include <encoding/payloads/nonce_payload.h>
+#include <encoding/payloads/ke_payload.h>
+#include <encoding/payloads/id_payload.h>
+#include <encoding/payloads/payload.h>
+#include <sa/ikev1/tasks/informational.h>
+#include <sa/ikev1/tasks/quick_delete.h>
+
+typedef struct private_quick_mode_t private_quick_mode_t;
+
+/**
+ * Private members of a quick_mode_t task.
+ */
+struct private_quick_mode_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	quick_mode_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * TRUE if we are initiating quick mode
+	 */
+	bool initiator;
+
+	/**
+	 * Traffic selector of initiator
+	 */
+	traffic_selector_t *tsi;
+
+	/**
+	 * Traffic selector of responder
+	 */
+	traffic_selector_t *tsr;
+
+	/**
+	 * Initiators nonce
+	 */
+	chunk_t nonce_i;
+
+	/**
+	 * Responder nonce
+	 */
+	chunk_t nonce_r;
+
+	/**
+	 * Initiators ESP SPI
+	 */
+	u_int32_t spi_i;
+
+	/**
+	 * Responder ESP SPI
+	 */
+	u_int32_t spi_r;
+
+	/**
+	 * selected CHILD_SA proposal
+	 */
+	proposal_t *proposal;
+
+	/**
+	 * Config of CHILD_SA to establish
+	 */
+	child_cfg_t *config;
+
+	/**
+	 * CHILD_SA we are about to establish
+	 */
+	child_sa_t *child_sa;
+
+	/**
+	 * IKEv1 keymat
+	 */
+	keymat_v1_t *keymat;
+
+	/**
+	 * DH exchange, when PFS is in use
+	 */
+	diffie_hellman_t *dh;
+
+	/**
+	 * Negotiated lifetime of new SA
+	 */
+	u_int32_t lifetime;
+
+	/**
+	 * Negotaited lifebytes of new SA
+	 */
+	u_int64_t lifebytes;
+
+	/**
+	 * Notify type in case of error
+	 */
+	notify_type_t notify_type;
+
+	/** states of quick mode */
+	enum {
+		QM_INIT,
+		QM_NEGOTIATED,
+	} state;
+};
+
+/**
+ * Install negotiated CHILD_SA
+ */
+static bool install(private_quick_mode_t *this)
+{
+	status_t status, status_i, status_o;
+	chunk_t encr_i, encr_r, integ_i, integ_r;
+	linked_list_t *tsi, *tsr;
+
+	this->child_sa->set_proposal(this->child_sa, this->proposal);
+	this->child_sa->set_state(this->child_sa, CHILD_INSTALLING);
+	this->child_sa->set_mode(this->child_sa, MODE_TUNNEL);
+	this->child_sa->set_protocol(this->child_sa,
+								 this->proposal->get_protocol(this->proposal));
+
+	status_i = status_o = FAILED;
+	encr_i = encr_r = integ_i = integ_r = chunk_empty;
+	tsi = linked_list_create();
+	tsr = linked_list_create();
+	tsi->insert_last(tsi, this->tsi);
+	tsr->insert_last(tsr, this->tsr);
+	if (this->keymat->derive_child_keys(this->keymat, this->proposal, this->dh,
+						this->spi_i, this->spi_r, this->nonce_i, this->nonce_r,
+						&encr_i, &integ_i, &encr_r, &integ_r))
+	{
+		if (this->initiator)
+		{
+			status_i = this->child_sa->install(this->child_sa, encr_r, integ_r,
+							this->spi_i, 0, TRUE, FALSE, tsi, tsr);
+			status_o = this->child_sa->install(this->child_sa, encr_i, integ_i,
+							this->spi_r, 0, FALSE, FALSE, tsi, tsr);
+		}
+		else
+		{
+			status_i = this->child_sa->install(this->child_sa, encr_i, integ_i,
+							this->spi_r, 0, TRUE, FALSE, tsr, tsi);
+			status_o = this->child_sa->install(this->child_sa, encr_r, integ_r,
+							this->spi_i, 0, FALSE, FALSE, tsr, tsi);
+		}
+	}
+	chunk_clear(&integ_i);
+	chunk_clear(&integ_r);
+	chunk_clear(&encr_i);
+	chunk_clear(&encr_r);
+
+	if (status_i != SUCCESS || status_o != SUCCESS)
+	{
+		DBG1(DBG_IKE, "unable to install %s%s%sIPsec SA (SAD) in kernel",
+			(status_i != SUCCESS) ? "inbound " : "",
+			(status_i != SUCCESS && status_o != SUCCESS) ? "and ": "",
+			(status_o != SUCCESS) ? "outbound " : "");
+		tsi->destroy(tsi);
+		tsr->destroy(tsr);
+		return FALSE;
+	}
+
+	if (this->initiator)
+	{
+		status = this->child_sa->add_policies(this->child_sa, tsi, tsr);
+	}
+	else
+	{
+		status = this->child_sa->add_policies(this->child_sa, tsr, tsi);
+	}
+	tsi->destroy(tsi);
+	tsr->destroy(tsr);
+	if (status != SUCCESS)
+	{
+		DBG1(DBG_IKE, "unable to install IPsec policies (SPD) in kernel");
+		return FALSE;
+	}
+
+	charon->bus->child_keys(charon->bus, this->child_sa, this->initiator,
+							this->dh, this->nonce_i, this->nonce_r);
+
+	/* add to IKE_SA, and remove from task */
+	this->child_sa->set_state(this->child_sa, CHILD_INSTALLED);
+	this->ike_sa->add_child_sa(this->ike_sa, this->child_sa);
+
+	DBG0(DBG_IKE, "CHILD_SA %s{%d} established "
+		 "with SPIs %.8x_i %.8x_o and TS %#R=== %#R",
+		 this->child_sa->get_name(this->child_sa),
+		 this->child_sa->get_reqid(this->child_sa),
+		 ntohl(this->child_sa->get_spi(this->child_sa, TRUE)),
+		 ntohl(this->child_sa->get_spi(this->child_sa, FALSE)),
+		 this->child_sa->get_traffic_selectors(this->child_sa, TRUE),
+		 this->child_sa->get_traffic_selectors(this->child_sa, FALSE));
+
+	charon->bus->child_updown(charon->bus, this->child_sa, TRUE);
+
+	this->child_sa = NULL;
+
+	return TRUE;
+}
+
+/**
+ * Generate and add NONCE
+ */
+static bool add_nonce(private_quick_mode_t *this, chunk_t *nonce,
+					  message_t *message)
+{
+	nonce_payload_t *nonce_payload;
+	rng_t *rng;
+
+	rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
+	if (!rng)
+	{
+		DBG1(DBG_IKE, "no RNG found to create nonce");
+		return FALSE;
+	}
+	rng->allocate_bytes(rng, NONCE_SIZE, nonce);
+	rng->destroy(rng);
+
+	nonce_payload = nonce_payload_create(NONCE_V1);
+	nonce_payload->set_nonce(nonce_payload, *nonce);
+	message->add_payload(message, &nonce_payload->payload_interface);
+
+	return TRUE;
+}
+
+/**
+ * Extract nonce from NONCE payload
+ */
+static bool get_nonce(private_quick_mode_t *this, chunk_t *nonce,
+					  message_t *message)
+{
+	nonce_payload_t *nonce_payload;
+
+	nonce_payload = (nonce_payload_t*)message->get_payload(message, NONCE_V1);
+	if (!nonce_payload)
+	{
+		DBG1(DBG_IKE, "NONCE payload missing in message");
+		return FALSE;
+	}
+	*nonce = nonce_payload->get_nonce(nonce_payload);
+
+	return TRUE;
+}
+
+/**
+ * Add KE payload to message
+ */
+static void add_ke(private_quick_mode_t *this, message_t *message)
+{
+	ke_payload_t *ke_payload;
+
+	ke_payload = ke_payload_create_from_diffie_hellman(KEY_EXCHANGE_V1, this->dh);
+	message->add_payload(message, &ke_payload->payload_interface);
+}
+
+/**
+ * Get DH value from a KE payload
+ */
+static bool get_ke(private_quick_mode_t *this, message_t *message)
+{
+	ke_payload_t *ke_payload;
+
+	ke_payload = (ke_payload_t*)message->get_payload(message, KEY_EXCHANGE_V1);
+	if (!ke_payload)
+	{
+		DBG1(DBG_IKE, "KE payload missing");
+		return FALSE;
+	}
+	this->dh->set_other_public_value(this->dh,
+								ke_payload->get_key_exchange_data(ke_payload));
+	return TRUE;
+}
+
+/**
+ * Select a traffic selector from configuration
+ */
+static traffic_selector_t* select_ts(private_quick_mode_t *this, bool local,
+									 linked_list_t *supplied)
+{
+	traffic_selector_t *ts;
+	linked_list_t *list;
+	host_t *host;
+
+	host = this->ike_sa->get_virtual_ip(this->ike_sa, local);
+	if (!host)
+	{
+		if (local)
+		{
+			host = this->ike_sa->get_my_host(this->ike_sa);
+		}
+		else
+		{
+			host = this->ike_sa->get_other_host(this->ike_sa);
+		}
+	}
+	list = this->config->get_traffic_selectors(this->config, local,
+											   supplied, host);
+	if (list->get_first(list, (void**)&ts) == SUCCESS)
+	{
+		if (list->get_count(list) > 1)
+		{
+			DBG1(DBG_IKE, "configuration has more than one %s traffic selector,"
+				 " using first only", local ? "local" : "remote");
+		}
+		ts = ts->clone(ts);
+	}
+	else
+	{
+		DBG1(DBG_IKE, "%s traffic selector missing in configuration",
+			 local ? "local" : "local");
+		ts = NULL;
+	}
+	list->destroy_offset(list, offsetof(traffic_selector_t, destroy));
+	return ts;
+}
+
+/**
+ * Add selected traffic selectors to message
+ */
+static void add_ts(private_quick_mode_t *this, message_t *message)
+{
+	id_payload_t *id_payload;
+	host_t *hsi, *hsr;
+
+	if (this->initiator)
+	{
+		hsi = this->ike_sa->get_my_host(this->ike_sa);
+		hsr = this->ike_sa->get_other_host(this->ike_sa);
+	}
+	else
+	{
+		hsr = this->ike_sa->get_my_host(this->ike_sa);
+		hsi = this->ike_sa->get_other_host(this->ike_sa);
+	}
+	/* add ID payload only if negotiating non host2host tunnels */
+	if (!this->tsi->is_host(this->tsi, hsi) ||
+		!this->tsr->is_host(this->tsr, hsr) ||
+		this->tsi->get_protocol(this->tsi) ||
+		this->tsr->get_protocol(this->tsr) ||
+		this->tsi->get_from_port(this->tsi) ||
+		this->tsr->get_from_port(this->tsr) ||
+		this->tsi->get_to_port(this->tsi) != 65535 ||
+		this->tsr->get_to_port(this->tsr) != 65535)
+	{
+		id_payload = id_payload_create_from_ts(this->tsi);
+		message->add_payload(message, &id_payload->payload_interface);
+		id_payload = id_payload_create_from_ts(this->tsr);
+		message->add_payload(message, &id_payload->payload_interface);
+	}
+}
+
+/**
+ * Get traffic selectors from received message
+ */
+static bool get_ts(private_quick_mode_t *this, message_t *message)
+{
+	traffic_selector_t *tsi = NULL, *tsr = NULL;
+	enumerator_t *enumerator;
+	id_payload_t *id_payload;
+	payload_t *payload;
+	host_t *hsi, *hsr;
+	bool first = TRUE;
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) == ID_V1)
+		{
+			id_payload = (id_payload_t*)payload;
+
+			if (first)
+			{
+				tsi = id_payload->get_ts(id_payload);
+				first = FALSE;
+			}
+			else
+			{
+				tsr = id_payload->get_ts(id_payload);
+				break;
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	/* create host2host selectors if ID payloads missing */
+	if (this->initiator)
+	{
+		hsi = this->ike_sa->get_my_host(this->ike_sa);
+		hsr = this->ike_sa->get_other_host(this->ike_sa);
+	}
+	else
+	{
+		hsr = this->ike_sa->get_my_host(this->ike_sa);
+		hsi = this->ike_sa->get_other_host(this->ike_sa);
+	}
+	if (!tsi)
+	{
+		tsi = traffic_selector_create_from_subnet(hsi->clone(hsi),
+							hsi->get_family(hsi) == AF_INET ? 32 : 128, 0, 0);
+	}
+	if (!tsr)
+	{
+		tsr = traffic_selector_create_from_subnet(hsr->clone(hsr),
+							hsr->get_family(hsr) == AF_INET ? 32 : 128, 0, 0);
+	}
+	if (this->initiator)
+	{
+		/* check if peer selection valid */
+		if (!tsr->is_contained_in(tsr, this->tsr) ||
+			!tsi->is_contained_in(tsi, this->tsi))
+		{
+			DBG1(DBG_IKE, "peer selected invalid traffic selectors: ",
+				 "%R for %R, %R for %R", tsi, this->tsi, tsr, this->tsr);
+			tsi->destroy(tsi);
+			tsr->destroy(tsr);
+			return FALSE;
+		}
+		this->tsi->destroy(this->tsi);
+		this->tsr->destroy(this->tsr);
+		this->tsi = tsi;
+		this->tsr = tsr;
+	}
+	else
+	{
+		this->tsi = tsi;
+		this->tsr = tsr;
+	}
+	return TRUE;
+}
+
+/**
+ * Add NAT-OA payloads
+ */
+static void add_nat_oa_payloads(private_quick_mode_t *this, message_t *message)
+{
+	identification_t *id;
+	id_payload_t *nat_oa;
+	host_t *src, *dst;
+
+	src = message->get_source(message);
+	dst = message->get_destination(message);
+
+	src = this->initiator ? src : dst;
+	dst = this->initiator ? dst : src;
+
+	/* first NAT-OA is the initiator's address */
+	id = identification_create_from_sockaddr(src->get_sockaddr(src));
+	nat_oa = id_payload_create_from_identification(NAT_OA_V1, id);
+	message->add_payload(message, (payload_t*)nat_oa);
+	id->destroy(id);
+
+	/* second NAT-OA is that of the responder */
+	id = identification_create_from_sockaddr(dst->get_sockaddr(dst));
+	nat_oa = id_payload_create_from_identification(NAT_OA_V1, id);
+	message->add_payload(message, (payload_t*)nat_oa);
+	id->destroy(id);
+}
+
+/**
+ * Look up lifetimes
+ */
+static void get_lifetimes(private_quick_mode_t *this)
+{
+	lifetime_cfg_t *lft;
+
+	lft = this->config->get_lifetime(this->config);
+	if (lft->time.life)
+	{
+		this->lifetime = lft->time.life;
+	}
+	else if (lft->bytes.life)
+	{
+		this->lifebytes = lft->bytes.life;
+	}
+	free(lft);
+}
+
+/**
+ * Check and apply lifetimes
+ */
+static void apply_lifetimes(private_quick_mode_t *this, sa_payload_t *sa_payload)
+{
+	u_int32_t lifetime;
+	u_int64_t lifebytes;
+
+	lifetime = sa_payload->get_lifetime(sa_payload);
+	lifebytes = sa_payload->get_lifebytes(sa_payload);
+	if (this->lifetime != lifetime)
+	{
+		DBG1(DBG_IKE, "received %us lifetime, configured %us, using lower",
+			 lifetime, this->lifetime);
+		this->lifetime = min(this->lifetime, lifetime);
+	}
+	if (this->lifebytes != lifebytes)
+	{
+		DBG1(DBG_IKE, "received %llu lifebytes, configured %llu, using lower",
+			 lifebytes, this->lifebytes);
+		this->lifebytes = min(this->lifebytes, lifebytes);
+	}
+}
+
+/**
+ * Set the task ready to build notify error message
+ */
+static status_t send_notify(private_quick_mode_t *this, notify_type_t type)
+{
+	notify_payload_t *notify;
+
+	notify = notify_payload_create_from_protocol_and_type(NOTIFY_V1,
+														  PROTO_ESP, type);
+	notify->set_spi(notify, this->spi_i);
+
+	this->ike_sa->queue_task(this->ike_sa,
+						(task_t*)informational_create(this->ike_sa, notify));
+	/* cancel all active/passive tasks in favour of informational */
+	return ALREADY_DONE;
+}
+
+METHOD(task_t, build_i, status_t,
+	private_quick_mode_t *this, message_t *message)
+{
+	switch (this->state)
+	{
+		case QM_INIT:
+		{
+			enumerator_t *enumerator;
+			sa_payload_t *sa_payload;
+			linked_list_t *list;
+			proposal_t *proposal;
+			ipsec_mode_t mode;
+			diffie_hellman_group_t group;
+			bool udp = this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY);
+
+			this->child_sa = child_sa_create(
+									this->ike_sa->get_my_host(this->ike_sa),
+									this->ike_sa->get_other_host(this->ike_sa),
+									this->config, 0, udp);
+
+			list = this->config->get_proposals(this->config, FALSE);
+
+			this->spi_i = this->child_sa->alloc_spi(this->child_sa, PROTO_ESP);
+			if (!this->spi_i)
+			{
+				DBG1(DBG_IKE, "allocating SPI from kernel failed");
+				return FAILED;
+			}
+			enumerator = list->create_enumerator(list);
+			while (enumerator->enumerate(enumerator, &proposal))
+			{
+				proposal->set_spi(proposal, this->spi_i);
+			}
+			enumerator->destroy(enumerator);
+
+			mode = this->config->get_mode(this->config);
+			if (udp && mode == MODE_TRANSPORT)
+			{
+				/* TODO-IKEv1: disable NAT-T for TRANSPORT mode by default? */
+				add_nat_oa_payloads(this, message);
+			}
+
+			get_lifetimes(this);
+			sa_payload = sa_payload_create_from_proposals_v1(list,
+								this->lifetime, this->lifebytes, AUTH_NONE,
+								mode, udp);
+			list->destroy_offset(list, offsetof(proposal_t, destroy));
+			message->add_payload(message, &sa_payload->payload_interface);
+
+			if (!add_nonce(this, &this->nonce_i, message))
+			{
+				return FAILED;
+			}
+
+			group = this->config->get_dh_group(this->config);
+			if (group != MODP_NONE)
+			{
+				this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
+														  group);
+				if (!this->dh)
+				{
+					DBG1(DBG_IKE, "configured DH group %N not supported",
+						 diffie_hellman_group_names, group);
+					return FAILED;
+				}
+				add_ke(this, message);
+			}
+			this->tsi = select_ts(this, TRUE, NULL);
+			this->tsr = select_ts(this, FALSE, NULL);
+			if (!this->tsi || !this->tsr)
+			{
+				return FAILED;
+			}
+			add_ts(this, message);
+			return NEED_MORE;
+		}
+		case QM_NEGOTIATED:
+		{
+			return SUCCESS;
+		}
+		default:
+			return FAILED;
+	}
+}
+
+/**
+ * Check for notify errors, return TRUE if error found
+ */
+static bool has_notify_errors(private_quick_mode_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+	bool err = FALSE;
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) == NOTIFY_V1)
+		{
+			notify_payload_t *notify;
+			notify_type_t type;
+
+			notify = (notify_payload_t*)payload;
+			type = notify->get_notify_type(notify);
+			if (type < 16384)
+			{
+
+				DBG1(DBG_IKE, "received %N error notify",
+					 notify_type_names, type);
+				err = TRUE;
+			}
+			else
+			{
+				DBG1(DBG_IKE, "received %N notify", notify_type_names, type);
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	return err;
+}
+
+METHOD(task_t, process_r, status_t,
+	private_quick_mode_t *this, message_t *message)
+{
+	switch (this->state)
+	{
+		case QM_INIT:
+		{
+			sa_payload_t *sa_payload;
+			linked_list_t *tsi, *tsr, *list;
+			peer_cfg_t *peer_cfg;
+			host_t *me, *other;
+			u_int16_t group;
+			bool udp = this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY);
+
+			if (!get_ts(this, message))
+			{
+				return FAILED;
+			}
+			me = this->ike_sa->get_virtual_ip(this->ike_sa, TRUE);
+			if (!me)
+			{
+				me = this->ike_sa->get_my_host(this->ike_sa);
+			}
+			other = this->ike_sa->get_virtual_ip(this->ike_sa, FALSE);
+			if (!other)
+			{
+				other = this->ike_sa->get_other_host(this->ike_sa);
+			}
+			peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+			tsi = linked_list_create();
+			tsr = linked_list_create();
+			tsi->insert_last(tsi, this->tsi);
+			tsr->insert_last(tsr, this->tsr);
+			this->tsi = this->tsr = NULL;
+			this->config = peer_cfg->select_child_cfg(peer_cfg, tsr, tsi,
+													  me, other);
+			this->tsi = select_ts(this, FALSE, tsi);
+			this->tsr = select_ts(this, TRUE, tsr);
+			tsi->destroy_offset(tsi, offsetof(traffic_selector_t, destroy));
+			tsr->destroy_offset(tsr, offsetof(traffic_selector_t, destroy));
+			if (!this->config)
+			{
+				DBG1(DBG_IKE, "no child config found");
+				return send_notify(this, NO_PROPOSAL_CHOSEN);
+			}
+
+			sa_payload = (sa_payload_t*)message->get_payload(message,
+													SECURITY_ASSOCIATION_V1);
+			if (!sa_payload)
+			{
+				DBG1(DBG_IKE, "sa payload missing");
+				return send_notify(this, INVALID_PAYLOAD_TYPE);
+			}
+			list = sa_payload->get_proposals(sa_payload);
+			this->proposal = this->config->select_proposal(this->config,
+														   list, FALSE, FALSE);
+			list->destroy_offset(list, offsetof(proposal_t, destroy));
+
+			get_lifetimes(this);
+			apply_lifetimes(this, sa_payload);
+
+			if (!this->proposal)
+			{
+				DBG1(DBG_IKE, "no matching proposal found, sending %N",
+					 notify_type_names, NO_PROPOSAL_CHOSEN);
+				return send_notify(this, NO_PROPOSAL_CHOSEN);
+			}
+			this->spi_i = this->proposal->get_spi(this->proposal);
+
+			if (!get_nonce(this, &this->nonce_i, message))
+			{
+				return send_notify(this, INVALID_PAYLOAD_TYPE);
+			}
+
+			if (this->proposal->get_algorithm(this->proposal,
+										DIFFIE_HELLMAN_GROUP, &group, NULL))
+			{
+				this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
+														  group);
+				if (!this->dh)
+				{
+					DBG1(DBG_IKE, "negotiated DH group %N not supported",
+						 diffie_hellman_group_names, group);
+					return send_notify(this, INVALID_KEY_INFORMATION);
+				}
+				if (!get_ke(this, message))
+				{
+					return send_notify(this, INVALID_PAYLOAD_TYPE);
+				}
+			}
+
+			this->child_sa = child_sa_create(
+									this->ike_sa->get_my_host(this->ike_sa),
+									this->ike_sa->get_other_host(this->ike_sa),
+									this->config, 0, udp);
+			return NEED_MORE;
+		}
+		case QM_NEGOTIATED:
+		{
+			if (has_notify_errors(this, message))
+			{
+				return SUCCESS;
+			}
+			if (!install(this))
+			{
+				this->ike_sa->queue_task(this->ike_sa,
+					(task_t*)quick_delete_create(this->ike_sa,
+								this->proposal->get_protocol(this->proposal),
+								this->spi_i, TRUE));
+				return ALREADY_DONE;
+			}
+			return SUCCESS;
+		}
+		default:
+			return FAILED;
+	}
+}
+
+METHOD(task_t, build_r, status_t,
+	private_quick_mode_t *this, message_t *message)
+{
+	switch (this->state)
+	{
+		case QM_INIT:
+		{
+			sa_payload_t *sa_payload;
+			ipsec_mode_t mode;
+			bool udp = this->child_sa->has_encap(this->child_sa);
+
+			this->spi_r = this->child_sa->alloc_spi(this->child_sa, PROTO_ESP);
+			if (!this->spi_r)
+			{
+				DBG1(DBG_IKE, "allocating SPI from kernel failed");
+				return send_notify(this, NO_PROPOSAL_CHOSEN);
+			}
+			this->proposal->set_spi(this->proposal, this->spi_r);
+
+			mode = this->config->get_mode(this->config);
+			if (udp && mode == MODE_TRANSPORT)
+			{
+				/* TODO-IKEv1: disable NAT-T for TRANSPORT mode by default? */
+				add_nat_oa_payloads(this, message);
+			}
+
+			sa_payload = sa_payload_create_from_proposal_v1(this->proposal,
+								this->lifetime, this->lifebytes, AUTH_NONE,
+								mode, udp);
+			message->add_payload(message, &sa_payload->payload_interface);
+
+			if (!add_nonce(this, &this->nonce_r, message))
+			{
+				return FAILED;
+			}
+			if (this->dh)
+			{
+				add_ke(this, message);
+			}
+
+			add_ts(this, message);
+
+			this->state = QM_NEGOTIATED;
+			return NEED_MORE;
+		}
+		default:
+			return FAILED;
+	}
+}
+
+METHOD(task_t, process_i, status_t,
+	private_quick_mode_t *this, message_t *message)
+{
+	switch (this->state)
+	{
+		case QM_INIT:
+		{
+			sa_payload_t *sa_payload;
+			linked_list_t *list;
+
+			sa_payload = (sa_payload_t*)message->get_payload(message,
+													SECURITY_ASSOCIATION_V1);
+			if (!sa_payload)
+			{
+				DBG1(DBG_IKE, "sa payload missing");
+				return send_notify(this, NO_PROPOSAL_CHOSEN);
+			}
+			list = sa_payload->get_proposals(sa_payload);
+			this->proposal = this->config->select_proposal(this->config,
+														   list, FALSE, FALSE);
+			list->destroy_offset(list, offsetof(proposal_t, destroy));
+			if (!this->proposal)
+			{
+				DBG1(DBG_IKE, "no matching proposal found");
+				return send_notify(this, NO_PROPOSAL_CHOSEN);
+			}
+			this->spi_r = this->proposal->get_spi(this->proposal);
+
+			apply_lifetimes(this, sa_payload);
+
+			if (!get_nonce(this, &this->nonce_r, message))
+			{
+				return send_notify(this, INVALID_PAYLOAD_TYPE);
+			}
+			if (this->dh && !get_ke(this, message))
+			{
+				return send_notify(this, INVALID_KEY_INFORMATION);
+			}
+			if (!get_ts(this, message))
+			{
+				return send_notify(this, INVALID_PAYLOAD_TYPE);
+			}
+			if (!install(this))
+			{
+				return send_notify(this, NO_PROPOSAL_CHOSEN);
+			}
+			this->state = QM_NEGOTIATED;
+			return NEED_MORE;
+		}
+		default:
+			return FAILED;
+	}
+}
+
+METHOD(task_t, get_type, task_type_t,
+	private_quick_mode_t *this)
+{
+	return TASK_QUICK_MODE;
+}
+
+METHOD(task_t, migrate, void,
+	private_quick_mode_t *this, ike_sa_t *ike_sa)
+{
+	this->ike_sa = ike_sa;
+}
+
+METHOD(task_t, destroy, void,
+	private_quick_mode_t *this)
+{
+	chunk_free(&this->nonce_i);
+	chunk_free(&this->nonce_r);
+	DESTROY_IF(this->tsi);
+	DESTROY_IF(this->tsr);
+	DESTROY_IF(this->proposal);
+	DESTROY_IF(this->child_sa);
+	DESTROY_IF(this->config);
+	DESTROY_IF(this->dh);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+quick_mode_t *quick_mode_create(ike_sa_t *ike_sa, child_cfg_t *config,
+							traffic_selector_t *tsi, traffic_selector_t *tsr)
+{
+	private_quick_mode_t *this;
+
+	INIT(this,
+		.public = {
+			.task = {
+				.get_type = _get_type,
+				.migrate = _migrate,
+				.destroy = _destroy,
+			},
+		},
+		.ike_sa = ike_sa,
+		.initiator = config != NULL,
+		.config = config,
+		.keymat = (keymat_v1_t*)ike_sa->get_keymat(ike_sa),
+		.state = QM_INIT,
+	);
+
+	if (config)
+	{
+		this->public.task.build = _build_i;
+		this->public.task.process = _process_i;
+	}
+	else
+	{
+		this->public.task.build = _build_r;
+		this->public.task.process = _process_r;
+	}
+
+	return &this->public;
+}