added ITA Scanner IMC/IMV pair which detects open server ports on TNC clients

1 files changed, 266 insertions, 0 deletions

diff --git a/src/libimcv/plugins/imv_scanner.c b/src/libimcv/plugins/imv_scanner.c
new file mode 100644
index 000000000..276968c38
--- /dev/null
+++ b/src/libimcv/plugins/imv_scanner.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 "imv_scanner_state.h"
+
+#include <imv/imv_agent.h>
+#include <pa_tnc/pa_tnc_msg.h>
+#include <ietf/ietf_attr.h>
+#include <ietf/ietf_attr_pa_tnc_error.h>
+#include <ietf/ietf_attr_port_filter.h>
+
+#include <tncif_names.h>
+#include <tncif_pa_subtypes.h>
+
+#include <pen/pen.h>
+#include <debug.h>
+
+/* IMV definitions */
+
+static const char imv_name[] = "Scanner";
+
+#define IMV_VENDOR_ID	PEN_ITA
+#define IMV_SUBTYPE		PA_SUBTYPE_ITA_SCANNER
+
+static imv_agent_t *imv_scanner;
+
+/**
+ * see section 3.7.1 of TCG TNC IF-IMV Specification 1.2
+ */
+TNC_Result TNC_IMV_Initialize(TNC_IMVID imv_id,
+							  TNC_Version min_version,
+							  TNC_Version max_version,
+							  TNC_Version *actual_version)
+{
+	if (imv_scanner)
+	{
+		DBG1(DBG_IMV, "IMV \"%s\" has already been initialized", imv_name);
+		return TNC_RESULT_ALREADY_INITIALIZED;
+	}
+	imv_scanner = imv_agent_create(imv_name, IMV_VENDOR_ID, IMV_SUBTYPE,
+								imv_id, actual_version);
+	if (!imv_scanner)
+	{
+		return TNC_RESULT_FATAL;
+	}
+	if (min_version > TNC_IFIMV_VERSION_1 || max_version < TNC_IFIMV_VERSION_1)
+	{
+		DBG1(DBG_IMV, "no common IF-IMV version");
+		return TNC_RESULT_NO_COMMON_VERSION;
+	}
+	return TNC_RESULT_SUCCESS;
+}
+
+/**
+ * see section 3.7.2 of TCG TNC IF-IMV Specification 1.2
+ */
+TNC_Result TNC_IMV_NotifyConnectionChange(TNC_IMVID imv_id,
+										  TNC_ConnectionID connection_id,
+										  TNC_ConnectionState new_state)
+{
+	imv_state_t *state;
+
+	if (!imv_scanner)
+	{
+		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	switch (new_state)
+	{
+		case TNC_CONNECTION_STATE_CREATE:
+			state = imv_scanner_state_create(connection_id);
+			return imv_scanner->create_state(imv_scanner, state);
+		case TNC_CONNECTION_STATE_DELETE:
+			return imv_scanner->delete_state(imv_scanner, connection_id);
+		default:
+			return imv_scanner->change_state(imv_scanner, connection_id,
+											 new_state, NULL);
+	}
+}
+
+static TNC_Result send_message(TNC_ConnectionID connection_id)
+{
+	pa_tnc_msg_t *msg;
+	pa_tnc_attr_t *attr;
+	TNC_Result result;
+
+	msg = pa_tnc_msg_create();
+	msg->build(msg);
+	result = imv_scanner->send_message(imv_scanner, connection_id,
+									msg->get_encoding(msg));	
+	msg->destroy(msg);
+
+	return result;
+}
+
+/**
+ * see section 3.7.3 of TCG TNC IF-IMV Specification 1.2
+ */
+TNC_Result TNC_IMV_ReceiveMessage(TNC_IMVID imv_id,
+								  TNC_ConnectionID connection_id,
+								  TNC_BufferReference msg,
+								  TNC_UInt32 msg_len,
+								  TNC_MessageType msg_type)
+{
+	pa_tnc_msg_t *pa_tnc_msg;
+	pa_tnc_attr_t *attr;
+	imv_state_t *state;
+	enumerator_t *enumerator;
+	TNC_Result result;
+	bool fatal_error = FALSE;
+
+	if (!imv_scanner)
+	{
+		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+
+	/* get current IMV state */
+	if (!imv_scanner->get_state(imv_scanner, connection_id, &state))
+	{
+		return TNC_RESULT_FATAL;
+	}
+
+	/* parse received PA-TNC message and automatically handle any errors */ 
+	result = imv_scanner->receive_message(imv_scanner, connection_id,
+									   chunk_create(msg, msg_len), msg_type,
+									   &pa_tnc_msg);
+
+	/* no parsed PA-TNC attributes available if an error occurred */
+	if (!pa_tnc_msg)
+	{
+		return result;
+	}
+
+	/* analyze PA-TNC attributes */
+	enumerator = pa_tnc_msg->create_attribute_enumerator(pa_tnc_msg);
+	while (enumerator->enumerate(enumerator, &attr))
+	{
+		if (attr->get_vendor_id(attr) != PEN_IETF)
+		{
+			continue;
+		}
+
+		if (attr->get_type(attr) == IETF_ATTR_PA_TNC_ERROR)
+		{
+			ietf_attr_pa_tnc_error_t *error_attr;
+			pa_tnc_error_code_t error_code;
+			chunk_t msg_info, attr_info;
+
+			error_attr = (ietf_attr_pa_tnc_error_t*)attr;
+			error_code = error_attr->get_error_code(error_attr);
+			msg_info = error_attr->get_msg_info(error_attr);
+
+			DBG1(DBG_IMV, "received PA-TNC error '%N' concerning message %#B",
+				 pa_tnc_error_code_names, error_code, &msg_info);
+			switch (error_code)
+			{
+				case PA_ERROR_ATTR_TYPE_NOT_SUPPORTED:
+					attr_info = error_attr->get_attr_info(error_attr);
+					DBG1(DBG_IMV, "  unsupported attribute %#B", &attr_info);
+					break;
+				default:
+					break;
+			}
+			fatal_error = TRUE;
+		}
+		else if (attr->get_type(attr) == IETF_ATTR_PORT_FILTER)
+		{
+			ietf_attr_port_filter_t *attr_port_filter;
+			enumerator_t *enumerator;
+			bool blocked;
+			u_int8_t protocol;
+			u_int16_t port;
+	
+			attr_port_filter = (ietf_attr_port_filter_t*)attr;
+			enumerator = attr_port_filter->create_port_enumerator(attr_port_filter);
+			while (enumerator->enumerate(enumerator, &blocked, &protocol, &port))
+			{
+				DBG2(DBG_IMV, "%s: %s %5u", blocked ? "blocked" : "allowed",
+					(protocol == IPPROTO_TCP) ? "tcp" : "udp", port);
+			}
+			enumerator->destroy(enumerator);
+		}		
+	}
+	enumerator->destroy(enumerator);
+	pa_tnc_msg->destroy(pa_tnc_msg);
+
+	if (fatal_error)
+	{
+		state->set_recommendation(state,
+								TNC_IMV_ACTION_RECOMMENDATION_NO_RECOMMENDATION,
+								TNC_IMV_EVALUATION_RESULT_ERROR);			  
+		return imv_scanner->provide_recommendation(imv_scanner, connection_id);
+	}
+
+	return imv_scanner->provide_recommendation(imv_scanner, connection_id);
+}
+
+/**
+ * see section 3.7.4 of TCG TNC IF-IMV Specification 1.2
+ */
+TNC_Result TNC_IMV_SolicitRecommendation(TNC_IMVID imv_id,
+										 TNC_ConnectionID connection_id)
+{
+	if (!imv_scanner)
+	{
+		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	return imv_scanner->provide_recommendation(imv_scanner, connection_id);
+}
+
+/**
+ * see section 3.7.5 of TCG TNC IF-IMV Specification 1.2
+ */
+TNC_Result TNC_IMV_BatchEnding(TNC_IMVID imv_id,
+							   TNC_ConnectionID connection_id)
+{
+	if (!imv_scanner)
+	{
+		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	return TNC_RESULT_SUCCESS;
+}
+
+/**
+ * see section 3.7.6 of TCG TNC IF-IMV Specification 1.2
+ */
+TNC_Result TNC_IMV_Terminate(TNC_IMVID imv_id)
+{
+	if (!imv_scanner)
+	{
+		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	imv_scanner->destroy(imv_scanner);
+	imv_scanner = NULL;
+
+	return TNC_RESULT_SUCCESS;
+}
+
+/**
+ * see section 4.2.8.1 of TCG TNC IF-IMV Specification 1.2
+ */
+TNC_Result TNC_IMV_ProvideBindFunction(TNC_IMVID imv_id,
+									   TNC_TNCS_BindFunctionPointer bind_function)
+{
+	if (!imv_scanner)
+	{
+		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	return imv_scanner->bind_functions(imv_scanner, bind_function);
+}