src/libcharon/plugins/eap_ttls/eap_ttls_server.c - manifest_repos/strongswan - Git at Google

 /*
  * Copyright (C) 2010-2014 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 "eap_ttls_server.h"
 #include "eap_ttls_avp.h"

 #include <utils/debug.h>
 #include <daemon.h>

 #include <sa/eap/eap_method.h>
 #include <sa/eap/eap_inner_method.h>

 typedef struct private_eap_ttls_server_t private_eap_ttls_server_t;

 /**
  * Private data of an eap_ttls_server_t object.
  */
 struct private_eap_ttls_server_t {

 	/**
 	 * Public eap_ttls_server_t interface.
 	 */
 	eap_ttls_server_t public;

 	/**
 	 * Server identity
 	 */
 	identification_t *server;

 	/**
 	 * Peer identity
 	 */
 	identification_t *peer;

 	/**
 	 * Current EAP-TTLS phase2 state
 	 */
 	bool start_phase2;

 	/**
 	 * Current EAP-TTLS phase2 TNC state
 	 */
 	bool start_phase2_tnc;

 	/**
      * Current phase 2 EAP method
 	 */
 	eap_method_t *method;

 	/**
      * Pending outbound EAP message
 	 */
 	eap_payload_t *out;

 	/**
 	 * AVP handler
 	 */
 	eap_ttls_avp_t *avp;
 };

 /**
  * Start EAP client authentication protocol
  */
 static status_t start_phase2_auth(private_eap_ttls_server_t *this)
 {
 	char *eap_type_str;
 	eap_type_t type;

 	eap_type_str = lib->settings->get_str(lib->settings,
 									"%s.plugins.eap-ttls.phase2_method", "md5",
 									lib->ns);
 	type = eap_type_from_string(eap_type_str);
 	if (type == 0)
 	{
 		DBG1(DBG_IKE, "unrecognized phase2 method \"%s\"", eap_type_str);
 		return FAILED;
 	}
 	DBG1(DBG_IKE, "phase2 method %N selected", eap_type_names, type);
 		this->method = charon->eap->create_instance(charon->eap, type, 0,
 								EAP_SERVER, this->server, this->peer);
 	if (this->method == NULL)
 	{
 		DBG1(DBG_IKE, "%N method not available", eap_type_names, type);
 		return FAILED;
 	}
 	if (this->method->initiate(this->method, &this->out) == NEED_MORE)
 	{
 		return NEED_MORE;
 	}
 	else
 	{
 		DBG1(DBG_IKE, "%N method failed", eap_type_names, type);
 			return FAILED;
 	}
 }

 /**
  * If configured, start PT-EAP or legacy EAP-TNC protocol
  */
 static status_t start_phase2_tnc(private_eap_ttls_server_t *this,
 								 eap_type_t auth_type)
 {
 	eap_inner_method_t *inner_method;
 	eap_type_t type;
 	char *eap_type_str;

 	if (this->start_phase2_tnc && lib->settings->get_bool(lib->settings,
 							"%s.plugins.eap-ttls.phase2_tnc", FALSE, lib->ns))
 	{
 		eap_type_str = lib->settings->get_str(lib->settings,
 							"%s.plugins.eap-ttls.phase2_tnc_method", "pt",
 							lib->ns);
 		type = eap_type_from_string(eap_type_str);
 		if (type == 0)
 		{
 			DBG1(DBG_IKE, "unrecognized phase2 EAP TNC method \"%s\"",
 						   eap_type_str);
 			return FAILED;
 		}
 		DBG1(DBG_IKE, "phase2 method %N selected", eap_type_names, type);
 		this->method = charon->eap->create_instance(charon->eap, type,
 									0, EAP_SERVER, this->server, this->peer);
 		if (this->method == NULL)
 		{
 			DBG1(DBG_IKE, "%N method not available", eap_type_names, type);
 			return FAILED;
 		}
 		inner_method = (eap_inner_method_t *)this->method;
 		inner_method->set_auth_type(inner_method, auth_type);

 		this->start_phase2_tnc = FALSE;
 		if (this->method->initiate(this->method, &this->out) == NEED_MORE)
 		{
 			return NEED_MORE;
 		}
 		else
 		{
 			DBG1(DBG_IKE, "%N method failed", eap_type_names, type);
 			return FAILED;
 		}
 	}
 	return SUCCESS;
 }

 METHOD(tls_application_t, process, status_t,
 	private_eap_ttls_server_t *this, bio_reader_t *reader)
 {
 	chunk_t data = chunk_empty;
 	status_t status;
 	payload_t *payload;
 	eap_payload_t *in;
 	eap_code_t code;
 	eap_type_t type = EAP_NAK, received_type;
 	uint32_t vendor, received_vendor;

 	status = this->avp->process(this->avp, reader, &data);
 	switch (status)
 	{
 		case SUCCESS:
 			break;
 		case NEED_MORE:
 			return NEED_MORE;
 		case FAILED:
 		default:
 			return FAILED;
 	}
 	in = eap_payload_create_data(data);
 	chunk_free(&data);
 	payload = (payload_t*)in;

 	if (payload->verify(payload) != SUCCESS)
 	{
 		in->destroy(in);
 		return FAILED;
 	}
 	code = in->get_code(in);
 	received_type = in->get_type(in, &received_vendor);
 	DBG1(DBG_IKE, "received tunneled EAP-TTLS AVP [EAP/%N/%N]",
 							eap_code_short_names, code,
 							eap_type_short_names, received_type);
 	if (code != EAP_RESPONSE)
 	{
 		DBG1(DBG_IKE, "%N expected", eap_code_names, EAP_RESPONSE);
 		in->destroy(in);
 		return FAILED;
 	}

 	if (this->method)
 	{
 		type = this->method->get_type(this->method, &vendor);

 		if (type != received_type || vendor != received_vendor)
 		{
 			if (received_vendor == 0 && received_type == EAP_NAK)
 			{
 				DBG1(DBG_IKE, "peer does not support %N", eap_type_names, type);
 			}
 			else
 			{
 				DBG1(DBG_IKE, "received invalid EAP response");
 			}
 			in->destroy(in);
 			return FAILED;
 		}
 	}

 	if (!received_vendor && received_type == EAP_IDENTITY)
 	{
 		chunk_t eap_id;

 		if (this->method == NULL)
 		{
 			/* Received an EAP Identity response without a matching request */
 			this->method = charon->eap->create_instance(charon->eap,
 											 EAP_IDENTITY, 0, EAP_SERVER,
 											 this->server, this->peer);
 			if (this->method == NULL)
 			{
 				DBG1(DBG_IKE, "%N method not available",
 							   eap_type_names, EAP_IDENTITY);
 				return FAILED;
 			}
 		}

 		if (this->method->process(this->method, in, &this->out) != SUCCESS)
 		{

 			DBG1(DBG_IKE, "%N method failed", eap_type_names, EAP_IDENTITY);
 			return FAILED;
 		}

 		if (this->method->get_msk(this->method, &eap_id) == SUCCESS)
 		{
 			this->peer->destroy(this->peer);
 			this->peer = identification_create_from_data(eap_id);
 			DBG1(DBG_IKE, "received EAP identity '%Y'", this->peer);
 		}

 		in->destroy(in);
 		this->method->destroy(this->method);
 		this->method = NULL;

 		/* Start Phase 2 of EAP-TTLS authentication */
 		if (lib->settings->get_bool(lib->settings,
 					"%s.plugins.eap-ttls.request_peer_auth", FALSE, lib->ns))
 		{
 			return start_phase2_tnc(this, EAP_TLS);
 		}
 		else
 		{
 			return start_phase2_auth(this);
 		}
 	}

 	if (this->method == 0)
 	{
 		DBG1(DBG_IKE, "no %N phase2 method installed", eap_type_names, EAP_TTLS);
 		in->destroy(in);
 		return FAILED;
 	}

 	status = this->method->process(this->method, in, &this->out);
 	in->destroy(in);

 	switch (status)
 	{
 		case SUCCESS:
 			DBG1(DBG_IKE, "%N phase2 authentication of '%Y' with %N successful",
 							eap_type_names, EAP_TTLS, this->peer,
 							eap_type_names, type);
 			this->method->destroy(this->method);
 			this->method = NULL;

 			/* continue phase2 with EAP-TNC? */
 			return start_phase2_tnc(this, type);
 		case NEED_MORE:
 			break;
 		case FAILED:
 		default:
 			if (vendor)
 			{
 				DBG1(DBG_IKE, "vendor specific EAP method %d-%d failed",
 							   type, vendor);
 			}
 			else
 			{
 				DBG1(DBG_IKE, "%N method failed", eap_type_names, type);
 			}
 			return FAILED;
 	}
 	return status;
 }

 METHOD(tls_application_t, build, status_t,
 	private_eap_ttls_server_t *this, bio_writer_t *writer)
 {
 	chunk_t data;
 	eap_code_t code;
 	eap_type_t type;
 	uint32_t vendor;

 	if (this->method == NULL && this->start_phase2 &&
 		lib->settings->get_bool(lib->settings,
 					"%s.plugins.eap-ttls.phase2_piggyback", FALSE, lib->ns))
 	{
 		/* generate an EAP Identity request which will be piggybacked right
 		 * onto the TLS Finished message thus initiating EAP-TTLS phase2
 		 */
 		this->method = charon->eap->create_instance(charon->eap, EAP_IDENTITY,
 								 0,	EAP_SERVER, this->server, this->peer);
 		if (this->method == NULL)
 		{
 			DBG1(DBG_IKE, "%N method not available",
 				 eap_type_names, EAP_IDENTITY);
 			return FAILED;
 		}
 		this->method->initiate(this->method, &this->out);
 		this->start_phase2 = FALSE;
 	}

 	if (this->out)
 	{
 		code = this->out->get_code(this->out);
 		type = this->out->get_type(this->out, &vendor);
 		DBG1(DBG_IKE, "sending tunneled EAP-TTLS AVP [EAP/%N/%N]",
 						eap_code_short_names, code, eap_type_short_names, type);

 		/* get the raw EAP message data */
 		data = this->out->get_data(this->out);
 		this->avp->build(this->avp, writer, data);

 		this->out->destroy(this->out);
 		this->out = NULL;
 	}
 	return INVALID_STATE;
 }

 METHOD(tls_application_t, destroy, void,
 	private_eap_ttls_server_t *this)
 {
 	this->server->destroy(this->server);
 	this->peer->destroy(this->peer);
 	DESTROY_IF(this->method);
 	DESTROY_IF(this->out);
 	this->avp->destroy(this->avp);
 	free(this);
 }

 /**
  * See header
  */
 eap_ttls_server_t *eap_ttls_server_create(identification_t *server,
 										  identification_t *peer)
 {
 	private_eap_ttls_server_t *this;

 	INIT(this,
 		.public = {
 			.application = {
 				.process = _process,
 				.build = _build,
 				.destroy = _destroy,
 			},
 		},
 		.server = server->clone(server),
 		.peer = peer->clone(peer),
 		.start_phase2 = TRUE,
 		.start_phase2_tnc = TRUE,
 		.avp = eap_ttls_avp_create(),
 	);

 	return &this->public;
 }
	/*
	* Copyright (C) 2010-2014 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 "eap_ttls_server.h"
	#include "eap_ttls_avp.h"

	#include <utils/debug.h>
	#include <daemon.h>

	#include <sa/eap/eap_method.h>
	#include <sa/eap/eap_inner_method.h>

	typedef struct private_eap_ttls_server_t private_eap_ttls_server_t;

	/**
	* Private data of an eap_ttls_server_t object.
	*/
	struct private_eap_ttls_server_t {

	/**
	* Public eap_ttls_server_t interface.
	*/
	eap_ttls_server_t public;

	/**
	* Server identity
	*/
	identification_t *server;

	/**
	* Peer identity
	*/
	identification_t *peer;

	/**
	* Current EAP-TTLS phase2 state
	*/
	bool start_phase2;

	/**
	* Current EAP-TTLS phase2 TNC state
	*/
	bool start_phase2_tnc;

	/**
	* Current phase 2 EAP method
	*/
	eap_method_t *method;

	/**
	* Pending outbound EAP message
	*/
	eap_payload_t *out;

	/**
	* AVP handler
	*/
	eap_ttls_avp_t *avp;
	};

	/**
	* Start EAP client authentication protocol
	*/
	static status_t start_phase2_auth(private_eap_ttls_server_t *this)
	{
	char *eap_type_str;
	eap_type_t type;

	eap_type_str = lib->settings->get_str(lib->settings,
	"%s.plugins.eap-ttls.phase2_method", "md5",
	lib->ns);
	type = eap_type_from_string(eap_type_str);
	if (type == 0)
	{
	DBG1(DBG_IKE, "unrecognized phase2 method \"%s\"", eap_type_str);
	return FAILED;
	}
	DBG1(DBG_IKE, "phase2 method %N selected", eap_type_names, type);
	this->method = charon->eap->create_instance(charon->eap, type, 0,
	EAP_SERVER, this->server, this->peer);
	if (this->method == NULL)
	{
	DBG1(DBG_IKE, "%N method not available", eap_type_names, type);
	return FAILED;
	}
	if (this->method->initiate(this->method, &this->out) == NEED_MORE)
	{
	return NEED_MORE;
	}
	else
	{
	DBG1(DBG_IKE, "%N method failed", eap_type_names, type);
	return FAILED;
	}
	}

	/**
	* If configured, start PT-EAP or legacy EAP-TNC protocol
	*/
	static status_t start_phase2_tnc(private_eap_ttls_server_t *this,
	eap_type_t auth_type)
	{
	eap_inner_method_t *inner_method;
	eap_type_t type;
	char *eap_type_str;

	if (this->start_phase2_tnc && lib->settings->get_bool(lib->settings,
	"%s.plugins.eap-ttls.phase2_tnc", FALSE, lib->ns))
	{
	eap_type_str = lib->settings->get_str(lib->settings,
	"%s.plugins.eap-ttls.phase2_tnc_method", "pt",
	lib->ns);
	type = eap_type_from_string(eap_type_str);
	if (type == 0)
	{
	DBG1(DBG_IKE, "unrecognized phase2 EAP TNC method \"%s\"",
	eap_type_str);
	return FAILED;
	}
	DBG1(DBG_IKE, "phase2 method %N selected", eap_type_names, type);
	this->method = charon->eap->create_instance(charon->eap, type,
	0, EAP_SERVER, this->server, this->peer);
	if (this->method == NULL)
	{
	DBG1(DBG_IKE, "%N method not available", eap_type_names, type);
	return FAILED;
	}
	inner_method = (eap_inner_method_t *)this->method;
	inner_method->set_auth_type(inner_method, auth_type);

	this->start_phase2_tnc = FALSE;
	if (this->method->initiate(this->method, &this->out) == NEED_MORE)
	{
	return NEED_MORE;
	}
	else
	{
	DBG1(DBG_IKE, "%N method failed", eap_type_names, type);
	return FAILED;
	}
	}
	return SUCCESS;
	}

	METHOD(tls_application_t, process, status_t,
	private_eap_ttls_server_t this, bio_reader_t reader)
	{
	chunk_t data = chunk_empty;
	status_t status;
	payload_t *payload;
	eap_payload_t *in;
	eap_code_t code;
	eap_type_t type = EAP_NAK, received_type;
	uint32_t vendor, received_vendor;

	status = this->avp->process(this->avp, reader, &data);
	switch (status)
	{
	case SUCCESS:
	break;
	case NEED_MORE:
	return NEED_MORE;
	case FAILED:
	default:
	return FAILED;
	}
	in = eap_payload_create_data(data);
	chunk_free(&data);
	payload = (payload_t*)in;

	if (payload->verify(payload) != SUCCESS)
	{
	in->destroy(in);
	return FAILED;
	}
	code = in->get_code(in);
	received_type = in->get_type(in, &received_vendor);
	DBG1(DBG_IKE, "received tunneled EAP-TTLS AVP [EAP/%N/%N]",
	eap_code_short_names, code,
	eap_type_short_names, received_type);
	if (code != EAP_RESPONSE)
	{
	DBG1(DBG_IKE, "%N expected", eap_code_names, EAP_RESPONSE);
	in->destroy(in);
	return FAILED;
	}

	if (this->method)
	{
	type = this->method->get_type(this->method, &vendor);

	if (type != received_type \|\| vendor != received_vendor)
	{
	if (received_vendor == 0 && received_type == EAP_NAK)
	{
	DBG1(DBG_IKE, "peer does not support %N", eap_type_names, type);
	}
	else
	{
	DBG1(DBG_IKE, "received invalid EAP response");
	}
	in->destroy(in);
	return FAILED;
	}
	}

	if (!received_vendor && received_type == EAP_IDENTITY)
	{
	chunk_t eap_id;

	if (this->method == NULL)
	{
	/* Received an EAP Identity response without a matching request */
	this->method = charon->eap->create_instance(charon->eap,
	EAP_IDENTITY, 0, EAP_SERVER,
	this->server, this->peer);
	if (this->method == NULL)
	{
	DBG1(DBG_IKE, "%N method not available",
	eap_type_names, EAP_IDENTITY);
	return FAILED;
	}
	}

	if (this->method->process(this->method, in, &this->out) != SUCCESS)
	{

	DBG1(DBG_IKE, "%N method failed", eap_type_names, EAP_IDENTITY);
	return FAILED;
	}

	if (this->method->get_msk(this->method, &eap_id) == SUCCESS)
	{
	this->peer->destroy(this->peer);
	this->peer = identification_create_from_data(eap_id);
	DBG1(DBG_IKE, "received EAP identity '%Y'", this->peer);
	}

	in->destroy(in);
	this->method->destroy(this->method);
	this->method = NULL;

	/* Start Phase 2 of EAP-TTLS authentication */
	if (lib->settings->get_bool(lib->settings,
	"%s.plugins.eap-ttls.request_peer_auth", FALSE, lib->ns))
	{
	return start_phase2_tnc(this, EAP_TLS);
	}
	else
	{
	return start_phase2_auth(this);
	}
	}

	if (this->method == 0)
	{
	DBG1(DBG_IKE, "no %N phase2 method installed", eap_type_names, EAP_TTLS);
	in->destroy(in);
	return FAILED;
	}

	status = this->method->process(this->method, in, &this->out);
	in->destroy(in);

	switch (status)
	{
	case SUCCESS:
	DBG1(DBG_IKE, "%N phase2 authentication of '%Y' with %N successful",
	eap_type_names, EAP_TTLS, this->peer,
	eap_type_names, type);
	this->method->destroy(this->method);
	this->method = NULL;

	/* continue phase2 with EAP-TNC? */
	return start_phase2_tnc(this, type);
	case NEED_MORE:
	break;
	case FAILED:
	default:
	if (vendor)
	{
	DBG1(DBG_IKE, "vendor specific EAP method %d-%d failed",
	type, vendor);
	}
	else
	{
	DBG1(DBG_IKE, "%N method failed", eap_type_names, type);
	}
	return FAILED;
	}
	return status;
	}

	METHOD(tls_application_t, build, status_t,
	private_eap_ttls_server_t this, bio_writer_t writer)
	{
	chunk_t data;
	eap_code_t code;
	eap_type_t type;
	uint32_t vendor;

	if (this->method == NULL && this->start_phase2 &&
	lib->settings->get_bool(lib->settings,
	"%s.plugins.eap-ttls.phase2_piggyback", FALSE, lib->ns))
	{
	/* generate an EAP Identity request which will be piggybacked right
	* onto the TLS Finished message thus initiating EAP-TTLS phase2
	*/
	this->method = charon->eap->create_instance(charon->eap, EAP_IDENTITY,
	0, EAP_SERVER, this->server, this->peer);
	if (this->method == NULL)
	{
	DBG1(DBG_IKE, "%N method not available",
	eap_type_names, EAP_IDENTITY);
	return FAILED;
	}
	this->method->initiate(this->method, &this->out);
	this->start_phase2 = FALSE;
	}

	if (this->out)
	{
	code = this->out->get_code(this->out);
	type = this->out->get_type(this->out, &vendor);
	DBG1(DBG_IKE, "sending tunneled EAP-TTLS AVP [EAP/%N/%N]",
	eap_code_short_names, code, eap_type_short_names, type);

	/* get the raw EAP message data */
	data = this->out->get_data(this->out);
	this->avp->build(this->avp, writer, data);

	this->out->destroy(this->out);
	this->out = NULL;
	}
	return INVALID_STATE;
	}

	METHOD(tls_application_t, destroy, void,
	private_eap_ttls_server_t *this)
	{
	this->server->destroy(this->server);
	this->peer->destroy(this->peer);
	DESTROY_IF(this->method);
	DESTROY_IF(this->out);
	this->avp->destroy(this->avp);
	free(this);
	}

	/**
	* See header
	*/
	eap_ttls_server_t eap_ttls_server_create(identification_t server,
	identification_t *peer)
	{
	private_eap_ttls_server_t *this;

	INIT(this,
	.public = {
	.application = {
	.process = _process,
	.build = _build,
	.destroy = _destroy,
	},
	},
	.server = server->clone(server),
	.peer = peer->clone(peer),
	.start_phase2 = TRUE,
	.start_phase2_tnc = TRUE,
	.avp = eap_ttls_avp_create(),
	);

	return &this->public;
	}