implemented server side support for EAP-TTLS
This commit is contained in:
Andreas Steffen
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/*
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* Copyright (C) 2010 Andreas Steffen
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* Copyright (C) 2010 HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "eap_ttls_server.h"
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#include "eap_ttls_avp.h"
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#include <debug.h>
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#include <daemon.h>
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#include <sa/authenticators/eap/eap_method.h>
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typedef struct private_eap_ttls_server_t private_eap_ttls_server_t;
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/**
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* Private data of an eap_ttls_server_t object.
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*/
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struct private_eap_ttls_server_t {
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/**
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* Public eap_ttls_server_t interface.
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*/
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eap_ttls_server_t public;
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/**
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* Server identity
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*/
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identification_t *server;
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/**
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* Peer identity
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*/
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identification_t *peer;
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/**
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* Current EAP-TTLS state
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*/
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bool start_phase2;
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/**
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* Current phase 2 EAP method
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*/
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eap_method_t *method;
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/**
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* Pending outbound EAP message
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*/
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eap_payload_t *out;
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/**
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* AVP handler
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*/
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eap_ttls_avp_t *avp;
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};
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METHOD(tls_application_t, process, status_t,
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private_eap_ttls_server_t *this, tls_reader_t *reader)
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{
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chunk_t data;
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status_t status;
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payload_t *payload;
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eap_payload_t *in;
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eap_code_t code;
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eap_type_t type, received_type;
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u_int32_t vendor, received_vendor;
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status = this->avp->process(this->avp, reader, &data);
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if (status == FAILED)
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{
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return FAILED;
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}
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in = eap_payload_create_data(data);
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payload = (payload_t*)in;
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if (payload->verify(payload) != SUCCESS)
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{
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in->destroy(in);
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return FAILED;
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}
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code = in->get_code(in);
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received_type = in->get_type(in, &received_vendor);
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DBG1(DBG_IKE, "received tunneled EAP-TTLS AVP [EAP/%N/%N]",
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eap_code_short_names, code,
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eap_type_short_names, received_type);
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if (code != EAP_RESPONSE)
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{
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DBG1(DBG_IKE, "%N expected", eap_code_names, EAP_RESPONSE);
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in->destroy(in);
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return FAILED;
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}
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if (this->method)
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{
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type = this->method->get_type(this->method, &vendor);
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if (type != received_type || vendor != received_vendor)
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{
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if (received_vendor == 0 && received_type == EAP_NAK)
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{
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DBG1(DBG_IKE, "peer does not support %N", eap_type_names, type);
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}
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else
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{
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DBG1(DBG_IKE, "received invalid EAP response");
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}
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in->destroy(in);
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return FAILED;
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}
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}
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if (!received_vendor && received_type == EAP_IDENTITY)
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{
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chunk_t eap_id;
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char * eap_type_str;
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if (this->method == NULL)
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{
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/* Received an EAP Identity response without a matching request */
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this->method = charon->eap->create_instance(charon->eap,
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EAP_IDENTITY, 0, EAP_SERVER,
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this->server, this->peer);
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if (this->method == NULL)
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{
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DBG1(DBG_IKE, "%N method not available",
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eap_type_names, EAP_IDENTITY);
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return FAILED;
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}
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}
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if (this->method->process(this->method, in, &this->out) != SUCCESS)
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{
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DBG1(DBG_IKE, "%N method failed", eap_type_names, EAP_IDENTITY);
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return FAILED;
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}
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if (this->method->get_msk(this->method, &eap_id) == SUCCESS)
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{
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this->peer->destroy(this->peer);
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this->peer = identification_create_from_data(eap_id);
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DBG1(DBG_IKE, "received EAP identity '%Y'", this->peer);
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}
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in->destroy(in);
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this->method->destroy(this->method);
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this->method = NULL;
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/* Start Phase 2 of EAP-TTLS authentication */
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eap_type_str = lib->settings->get_str(lib->settings,
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"charon.plugins.eap-ttls.phase2_method", "md5");
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type = eap_type_from_string(eap_type_str);
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if (type == 0)
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{
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DBG1(DBG_IKE, "unrecognized phase2 method \"%s\"", eap_type_str);
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return FAILED;
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}
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DBG1(DBG_IKE, "phase2 method %N selected", eap_type_names, type);
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this->method = charon->eap->create_instance(charon->eap, type, 0,
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EAP_SERVER, this->server, this->peer);
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if (this->method == NULL)
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{
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DBG1(DBG_IKE, "%N method not available", eap_type_names, type);
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return FAILED;
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}
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if (this->method->initiate(this->method, &this->out) == NEED_MORE)
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{
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return NEED_MORE;
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}
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else
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{
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DBG1(DBG_IKE, "%N method failed", eap_type_names, type);
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return FAILED;
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}
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}
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if (this->method == 0)
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{
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DBG1(DBG_IKE, "no %N phase2 method installed", eap_type_names, EAP_TTLS);
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in->destroy(in);
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return FAILED;
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}
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status = this->method->process(this->method, in, &this->out);
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in->destroy(in);
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switch (status)
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{
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case SUCCESS:
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DBG1(DBG_IKE, "%N phase2 authentication of '%Y' with %N successful",
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eap_type_names, EAP_TTLS, this->peer,
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eap_type_names, type);
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break;
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case NEED_MORE:
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break;
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case FAILED:
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default:
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DBG1(DBG_IKE, "%N method failed", eap_type_names, type);
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}
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return status;
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}
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METHOD(tls_application_t, build, status_t,
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private_eap_ttls_server_t *this, tls_writer_t *writer)
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{
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chunk_t data;
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eap_code_t code;
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eap_type_t type;
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u_int32_t vendor;
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if (this->out)
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{
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code = this->out->get_code(this->out);
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type = this->out->get_type(this->out, &vendor);
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DBG1(DBG_IKE, "sending tunneled EAP-TTLS AVP [EAP/%N/%N]",
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eap_code_short_names, code, eap_type_short_names, type);
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/* get the raw EAP message data */
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data = this->out->get_data(this->out);
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this->avp->build(this->avp, writer, data);
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this->out->destroy(this->out);
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this->out = NULL;
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}
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return INVALID_STATE;
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}
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METHOD(tls_application_t, destroy, void,
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private_eap_ttls_server_t *this)
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{
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this->server->destroy(this->server);
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this->peer->destroy(this->peer);
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DESTROY_IF(this->method);
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DESTROY_IF(this->out);
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this->avp->destroy(this->avp);
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free(this);
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}
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/**
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* See header
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*/
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eap_ttls_server_t *eap_ttls_server_create(identification_t *server,
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identification_t *peer)
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{
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private_eap_ttls_server_t *this;
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INIT(this,
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.public.application = {
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.process = _process,
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.build = _build,
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.destroy = _destroy,
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},
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.server = server->clone(server),
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.peer = peer->clone(peer),
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.start_phase2 = TRUE,
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.method = NULL,
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.out = NULL,
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.avp = eap_ttls_avp_create(),
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);
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return &this->public;
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}
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