1 files changed, 432 insertions, 0 deletions

diff --git a/src/libcharon/plugins/eap_peap/eap_peap_server.c b/src/libcharon/plugins/eap_peap/eap_peap_server.c
new file mode 100644
index 000000000..3fabc3575
--- /dev/null
+++ b/src/libcharon/plugins/eap_peap/eap_peap_server.c
@@ -0,0 +1,432 @@
+/*
+ * Copyright (C) 2011 Andreas Steffen
+ * Copyright (C) 2011 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_peap_server.h"
+#include "eap_peap_avp.h"
+
+#include <debug.h>
+#include <daemon.h>
+
+typedef struct private_eap_peap_server_t private_eap_peap_server_t;
+
+/**
+ * Private data of an eap_peap_server_t object.
+ */
+struct private_eap_peap_server_t {
+
+	/**
+	 * Public eap_peap_server_t interface.
+	 */
+	eap_peap_server_t public;
+
+	/**
+	 * Server identity
+	 */
+	identification_t *server;
+
+	/**
+	 * Peer identity
+	 */
+	identification_t *peer;
+
+	/**
+	 * Current EAP-PEAP phase2 state
+	 */
+	bool start_phase2;
+
+	/**
+	 * Current EAP-PEAP phase2 TNC state
+	 */
+	bool start_phase2_tnc;
+
+	/**
+	 * Starts phase 2 with EAP Identity request
+	 */
+	bool start_phase2_id;
+
+	/**
+	 * Final EAP-PEAP phase2 result
+	 */
+	eap_code_t phase2_result;
+
+	/**
+     * Outer phase 1 EAP method
+	 */
+	eap_method_t *ph1_method;
+
+	/**
+     * Current phase 2 EAP method
+	 */
+	eap_method_t *ph2_method;
+
+	/**
+     * Pending outbound EAP message
+	 */
+	eap_payload_t *out;
+
+	/**
+	 * AVP handler
+	 */
+	eap_peap_avp_t *avp;
+};
+
+/**
+ * Start EAP client authentication protocol
+ */
+static status_t start_phase2_auth(private_eap_peap_server_t *this)
+{
+	char *eap_type_str;
+	eap_type_t type;
+
+	eap_type_str = lib->settings->get_str(lib->settings,
+					 	"charon.plugins.eap-peap.phase2_method", "mschapv2");
+	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->ph2_method = charon->eap->create_instance(charon->eap, type, 0,
+								EAP_SERVER, this->server, this->peer);
+	if (this->ph2_method == NULL)
+	{
+		DBG1(DBG_IKE, "%N method not available", eap_type_names, type);
+		return FAILED;
+	}
+
+	/* synchronize EAP message identifiers of inner protocol with outer */
+	this->ph2_method->set_identifier(this->ph2_method,
+						this->ph1_method->get_identifier(this->ph1_method) + 1);
+
+	if (this->ph2_method->initiate(this->ph2_method, &this->out) == NEED_MORE)
+	{
+		return NEED_MORE;
+	}
+	else
+	{
+		DBG1(DBG_IKE, "%N method failed", eap_type_names, type);
+			return FAILED;
+	}
+}
+
+/**
+ * If configured, start EAP-TNC protocol
+ */
+static status_t start_phase2_tnc(private_eap_peap_server_t *this)
+{
+	if (this->start_phase2_tnc && lib->settings->get_bool(lib->settings,
+					 	"charon.plugins.eap-peap.phase2_tnc", FALSE))
+	{
+		DBG1(DBG_IKE, "phase2 method %N selected", eap_type_names, EAP_TNC);
+		this->ph2_method = charon->eap->create_instance(charon->eap, EAP_TNC,
+									0, EAP_SERVER, this->server, this->peer);
+		if (this->ph2_method == NULL)
+		{
+			DBG1(DBG_IKE, "%N method not available", eap_type_names, EAP_TNC);
+			return FAILED;
+		}
+		this->start_phase2_tnc = FALSE;
+
+		/* synchronize EAP message identifiers of inner protocol with outer */
+		this->ph2_method->set_identifier(this->ph2_method,
+						this->ph1_method->get_identifier(this->ph1_method) + 1);
+
+		if (this->ph2_method->initiate(this->ph2_method, &this->out) == NEED_MORE)
+		{
+			return NEED_MORE;
+		}
+		else
+		{
+			DBG1(DBG_IKE, "%N method failed", eap_type_names, EAP_TNC);
+			return FAILED;
+		}
+	}
+	return SUCCESS;
+}
+
+METHOD(tls_application_t, process, status_t,
+	private_eap_peap_server_t *this, tls_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;
+	u_int32_t vendor, received_vendor;
+
+	status = this->avp->process(this->avp, reader, &data,
+							this->ph1_method->get_identifier(this->ph1_method));
+	switch (status)
+	{
+		case SUCCESS:
+			break;
+		case NEED_MORE:
+			return NEED_MORE;
+		case FAILED:
+		default:
+			return FAILED;
+	}
+
+	in = eap_payload_create_data(data);
+	DBG3(DBG_IKE, "%B", &data);
+	chunk_free(&data);
+	payload = (payload_t*)in;
+
+	if (payload->verify(payload) != SUCCESS)
+	{
+		in->destroy(in);
+		return FAILED;
+	}
+
+	code = in->get_code(in);
+	if (code == EAP_REQUEST || code == EAP_RESPONSE)
+	{
+		received_type = in->get_type(in, &received_vendor);
+		DBG1(DBG_IKE, "received tunneled EAP-PEAP 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;
+		}
+	}
+	else
+	{
+		DBG1(DBG_IKE, "received tunneled EAP-PEAP AVP [EAP/%N]",
+						   		eap_code_short_names, code);
+
+		/* if EAP_SUCCESS check if to continue phase2 with EAP-TNC */
+		return (this->phase2_result == EAP_SUCCESS && code == EAP_SUCCESS) ?
+			   start_phase2_tnc(this) : FAILED;
+	}
+
+	if (this->ph2_method)
+	{
+		type = this->ph2_method->get_type(this->ph2_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->ph2_method == NULL)
+		{
+			/* Received an EAP Identity response without a matching request */
+			this->ph2_method = charon->eap->create_instance(charon->eap,
+											 EAP_IDENTITY, 0, EAP_SERVER,
+											 this->server, this->peer);
+			if (this->ph2_method == NULL)
+			{
+				DBG1(DBG_IKE, "%N method not available",
+							   eap_type_names, EAP_IDENTITY);
+				return FAILED;
+			}
+		}
+
+		if (this->ph2_method->process(this->ph2_method, in, &this->out) != SUCCESS)
+		{
+
+			DBG1(DBG_IKE, "%N method failed", eap_type_names, EAP_IDENTITY);
+			return FAILED;
+		}
+
+		if (this->ph2_method->get_msk(this->ph2_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->ph2_method->destroy(this->ph2_method);
+		this->ph2_method = NULL;
+
+		/* Start Phase 2 of EAP-PEAP authentication */
+		if (lib->settings->get_bool(lib->settings,
+					 	"charon.plugins.eap-peap.request_peer_auth", FALSE))
+		{
+			return start_phase2_tnc(this);
+		}
+		else
+		{
+			return start_phase2_auth(this);
+		}
+	}
+
+	if (this->ph2_method == 0)
+	{
+		DBG1(DBG_IKE, "no %N phase2 method installed", eap_type_names, EAP_PEAP);
+		in->destroy(in);
+		return FAILED;
+	}
+
+	status = this->ph2_method->process(this->ph2_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_PEAP, this->peer,
+							eap_type_names, type);
+			this->ph2_method->destroy(this->ph2_method);
+			this->ph2_method = NULL;
+
+			/* EAP-PEAP requires the sending of an inner EAP_SUCCESS message */	
+			this->phase2_result = EAP_SUCCESS;		
+			this->out = eap_payload_create_code(this->phase2_result, 1 +
+				 			this->ph1_method->get_identifier(this->ph1_method));
+			return NEED_MORE;
+		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);
+			}
+			/* EAP-PEAP requires the sending of an inner EAP_FAILURE message */
+			this->phase2_result = EAP_FAILURE;			
+			this->out = eap_payload_create_code(this->phase2_result, 1 +
+				 			this->ph1_method->get_identifier(this->ph1_method));
+			return NEED_MORE;
+	}
+	return status;
+}
+
+METHOD(tls_application_t, build, status_t,
+	private_eap_peap_server_t *this, tls_writer_t *writer)
+{
+	chunk_t data;
+	eap_code_t code;
+	eap_type_t type;
+	u_int32_t vendor;
+
+	if (this->ph2_method == NULL && this->start_phase2 && this->start_phase2_id)
+	{
+		/*
+		 * Start Phase 2 with an EAP Identity request either piggybacked right
+		 * onto the TLS Finished payload or delayed after the reception of an
+		 * empty EAP Acknowledge message.
+		 */
+		this->ph2_method = charon->eap->create_instance(charon->eap, EAP_IDENTITY,
+								 0,	EAP_SERVER, this->server, this->peer);
+		if (this->ph2_method == NULL)
+		{
+			DBG1(DBG_IKE, "%N method not available",
+				 eap_type_names, EAP_IDENTITY);
+			return FAILED;
+		}
+
+		/* synchronize EAP message identifiers of inner protocol with outer */
+		this->ph2_method->set_identifier(this->ph2_method,
+					this->ph1_method->get_identifier(this->ph1_method));
+
+		this->ph2_method->initiate(this->ph2_method, &this->out);
+		this->start_phase2 = FALSE;
+	}
+	
+	this->start_phase2_id = TRUE;
+
+	if (this->out)
+	{
+		code = this->out->get_code(this->out);
+		type = this->out->get_type(this->out, &vendor);
+		if (code == EAP_REQUEST || code == EAP_RESPONSE)
+		{
+			DBG1(DBG_IKE, "sending tunneled EAP-PEAP AVP [EAP/%N/%N]",
+				 eap_code_short_names, code, eap_type_short_names, type);
+		}
+		else
+		{
+			DBG1(DBG_IKE, "sending tunneled EAP-PEAP AVP [EAP/%N]",
+				 eap_code_short_names, code);
+		}
+
+		/* get the raw EAP message data */
+		data = this->out->get_data(this->out);
+		DBG3(DBG_IKE, "%B", &data);
+		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_peap_server_t *this)
+{
+	this->server->destroy(this->server);
+	this->peer->destroy(this->peer);
+	DESTROY_IF(this->ph2_method);
+	DESTROY_IF(this->out);
+	this->avp->destroy(this->avp);
+	free(this);
+}
+
+/**
+ * See header
+ */
+eap_peap_server_t *eap_peap_server_create(identification_t *server,
+										  identification_t *peer,
+										  eap_method_t *eap_method)
+{
+	private_eap_peap_server_t *this;
+
+	INIT(this,
+		.public = {
+			.application = {
+				.process = _process,
+				.build = _build,
+				.destroy = _destroy,
+			},
+		},
+		.server = server->clone(server),
+		.peer = peer->clone(peer),
+		.ph1_method = eap_method,
+		.start_phase2 = TRUE,
+		.start_phase2_tnc = TRUE,
+		.start_phase2_id = lib->settings->get_bool(lib->settings,
+			 				"charon.plugins.eap-peap.phase2_piggyback", FALSE),
+		.phase2_result = EAP_FAILURE,
+		.avp = eap_peap_avp_create(TRUE),
+	);
+
+	return &this->public;
+}