IKEv1 XAUTH: Added ability to configure XAUTH+PSK. Added task to handle XAUTH requests. Modified task_manager_v1 to enable it to initiate new tasks immediately after finishing a response.

src/libcharon/sa/tasks/xauth_request.c

@@ -0,0 +1,185 @@
+
+#include "xauth_request.h"
+
+#include <daemon.h>
+#include <hydra.h>
+#include <encoding/payloads/attribute_payload_v1.h>
+#include <encoding/payloads/data_attribute_v1.h>
+#include <encoding/payloads/hash_payload.h>
+#include <encoding/generator.h>
+
+typedef struct private_xauth_request_t private_xauth_request_t;
+
+/**
+ * Private members of a xauth_request_t task.
+ */
+struct private_xauth_request_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	xauth_request_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * virtual ip
+	 */
+	host_t *virtual_ip;
+
+	/**
+	 * list of attributes requested and its handler, entry_t
+	 */
+	linked_list_t *requested;
+};
+
+/**
+ * Entry for a requested attribute and the requesting handler
+ */
+typedef struct {
+	/** attribute requested */
+	configuration_attribute_type_t type;
+	/** handler requesting this attribute */
+	attribute_handler_t *handler;
+} entry_t;
+
+/**
+ * Scan for configuration payloads and attributes
+ */
+static void process_payloads(private_xauth_request_t *this, message_t *message)
+{
+}
+
+METHOD(task_t, build_i, status_t,
+	private_xauth_request_t *this, message_t *message)
+{
+	attribute_payload_v1_t *ap = NULL;
+	chunk_t chunk = chunk_empty;
+	data_attribute_v1_t *da = NULL;
+	hash_payload_t *hash_payload = NULL;
+	generator_t *generator;
+	chunk_t attr_chunk;
+	chunk_t mid_chunk;
+	u_int32_t *lenpos;
+	u_int32_t message_id;
+	keymat_t *keymat;
+	prf_t *prf;
+	chunk_t hash_in, hash_out;
+
+	DBG1(DBG_IKE, "BUILDING XAUTH REQUEST PACKET");
+	/* TODO1: Create ATTR payload */
+	ap = attribute_payload_v1_create();
+
+	da = data_attribute_v1_create_value(XAUTH_USER_NAME, chunk);
+	ap->add_attribute(ap, da);
+
+	da = data_attribute_v1_create_value(XAUTH_USER_PASSWORD, chunk);
+	ap->add_attribute(ap, da);
+
+	/* Create HASH payload */
+	hash_payload = hash_payload_create();
+	/* TODO1: Add data into the hash */
+
+	/* Calculate the chunk for the ATTR payload */
+	generator = generator_create();
+	ap->payload_interface.set_next_type(&ap->payload_interface, NO_PAYLOAD);
+	generator->generate_payload(generator, (payload_t *)ap);
+	attr_chunk = generator->get_chunk(generator, &lenpos);
+
+	/* Get the message ID in network order */
+	htoun32(&message_id, message->get_message_id(message));
+	mid_chunk = chunk_from_thing(message_id);
+
+	/* Get the hashed data */
+	hash_in = chunk_cat("cc", mid_chunk, attr_chunk);
+
+	message->add_payload(message, (payload_t *)hash_payload);
+	message->add_payload(message, (payload_t *)ap);
+
+	return NEED_MORE;
+}
+
+METHOD(task_t, process_r, status_t,
+	private_xauth_request_t *this, message_t *message)
+{
+	return NEED_MORE;
+}
+
+METHOD(task_t, build_r, status_t,
+	private_xauth_request_t *this, message_t *message)
+{
+	return NEED_MORE;
+}
+
+METHOD(task_t, process_i, status_t,
+	private_xauth_request_t *this, message_t *message)
+{
+	return NEED_MORE;
+}
+
+METHOD(task_t, get_type, task_type_t,
+	private_xauth_request_t *this)
+{
+	return TASK_XAUTH_REQUEST;
+}
+
+METHOD(task_t, migrate, void,
+	private_xauth_request_t *this, ike_sa_t *ike_sa)
+{
+	DESTROY_IF(this->virtual_ip);
+
+	this->ike_sa = ike_sa;
+	this->virtual_ip = NULL;
+	this->requested->destroy_function(this->requested, free);
+	this->requested = linked_list_create();
+}
+
+METHOD(task_t, destroy, void,
+	private_xauth_request_t *this)
+{
+	DESTROY_IF(this->virtual_ip);
+	this->requested->destroy_function(this->requested, free);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+xauth_request_t *xauth_request_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_xauth_request_t *this;
+
+	INIT(this,
+		.public = {
+			.task = {
+				.get_type = _get_type,
+				.migrate = _migrate,
+				.destroy = _destroy,
+			},
+		},
+		.initiator = initiator,
+		.ike_sa = ike_sa,
+		.requested = linked_list_create(),
+	);
+
+	if (initiator)
+	{
+		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;
+}