eap_server_identity.c

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/*
 * hostapd / EAP-Identity
 * Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "common.h"
#include "eap_i.h"


struct eap_identity_data {
        enum { CONTINUE, SUCCESS, FAILURE } state;
        int pick_up;
};


static void * eap_identity_init(struct eap_sm *sm)
{
        struct eap_identity_data *data;

        data = os_zalloc(sizeof(*data));
        if (data == NULL)
                return NULL;
        data->state = CONTINUE;

        return data;
}


static void * eap_identity_initPickUp(struct eap_sm *sm)
{
        struct eap_identity_data *data;
        data = eap_identity_init(sm);
        if (data) {
                data->pick_up = 1;
        }
        return data;
}


static void eap_identity_reset(struct eap_sm *sm, void *priv)
{
        struct eap_identity_data *data = priv;
        os_free(data);
}


static struct wpabuf * eap_identity_buildReq(struct eap_sm *sm, void *priv,
                                             u8 id)
{
        struct eap_identity_data *data = priv;
        struct wpabuf *req;
        const char *req_data;
        size_t req_data_len;

        if (sm->eapol_cb->get_eap_req_id_text) {
                req_data = sm->eapol_cb->get_eap_req_id_text(sm->eapol_ctx,
                                                             &req_data_len);
        } else {
                req_data = NULL;
                req_data_len = 0;
        }
        req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, req_data_len,
                            EAP_CODE_REQUEST, id);
        if (req == NULL) {
                wpa_printf(MSG_ERROR, "EAP-Identity: Failed to allocate "
                           "memory for request");
                data->state = FAILURE;
                return NULL;
        }

        wpabuf_put_data(req, req_data, req_data_len);

        return req;
}


static Boolean eap_identity_check(struct eap_sm *sm, void *priv,
                                  struct wpabuf *respData)
{
        const u8 *pos;
        size_t len;

        pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
                               respData, &len);
        if (pos == NULL) {
                wpa_printf(MSG_INFO, "EAP-Identity: Invalid frame");
                return TRUE;
        }

        return FALSE;
}


static void eap_identity_process(struct eap_sm *sm, void *priv,
                                 struct wpabuf *respData)
{
        struct eap_identity_data *data = priv;
        const u8 *pos;
        size_t len;

        if (data->pick_up) {
                if (eap_identity_check(sm, data, respData)) {
                        wpa_printf(MSG_DEBUG, "EAP-Identity: failed to pick "
                                   "up already started negotiation");
                        data->state = FAILURE;
                        return;
                }
                data->pick_up = 0;
        }

        pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
                               respData, &len);
        if (pos == NULL)
                return; /* Should not happen - frame already validated */

        wpa_hexdump_ascii(MSG_DEBUG, "EAP-Identity: Peer identity", pos, len);
        if (sm->identity)
                sm->update_user = TRUE;
        os_free(sm->identity);
        sm->identity = os_malloc(len ? len : 1);
        if (sm->identity == NULL) {
                data->state = FAILURE;
        } else {
                os_memcpy(sm->identity, pos, len);
                sm->identity_len = len;
                data->state = SUCCESS;
        }
}


static Boolean eap_identity_isDone(struct eap_sm *sm, void *priv)
{
        struct eap_identity_data *data = priv;
        return data->state != CONTINUE;
}


static Boolean eap_identity_isSuccess(struct eap_sm *sm, void *priv)
{
        struct eap_identity_data *data = priv;
        return data->state == SUCCESS;
}


int eap_server_identity_register(void)
{
        struct eap_method *eap;
        int ret;

        eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
                                      EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
                                      "Identity");
        if (eap == NULL)
                return -1;

        eap->init = eap_identity_init;
        eap->initPickUp = eap_identity_initPickUp;
        eap->reset = eap_identity_reset;
        eap->buildReq = eap_identity_buildReq;
        eap->check = eap_identity_check;
        eap->process = eap_identity_process;
        eap->isDone = eap_identity_isDone;
        eap->isSuccess = eap_identity_isSuccess;

        ret = eap_server_method_register(eap);
        if (ret)
                eap_server_method_free(eap);
        return ret;
}