Home | History | Annotate | Download | only in eap_server 
      1 /*
      2  * hostapd / EAP-Identity
      3  * Copyright (c) 2004-2006, Jouni Malinen <j (at) w1.fi>
      4  *
      5  * This program is free software; you can redistribute it and/or modify
      6  * it under the terms of the GNU General Public License version 2 as
      7  * published by the Free Software Foundation.
      8  *
      9  * Alternatively, this software may be distributed under the terms of BSD
     10  * license.
     11  *
     12  * See README and COPYING for more details.
     13  */
     14 
     15 #include "includes.h"
     16 
     17 #include "common.h"
     18 #include "eap_i.h"
     19 
     20 
     21 struct eap_identity_data {
     22 	enum { CONTINUE, SUCCESS, FAILURE } state;
     23 	int pick_up;
     24 };
     25 
     26 
     27 static void * eap_identity_init(struct eap_sm *sm)
     28 {
     29 	struct eap_identity_data *data;
     30 
     31 	data = os_zalloc(sizeof(*data));
     32 	if (data == NULL)
     33 		return NULL;
     34 	data->state = CONTINUE;
     35 
     36 	return data;
     37 }
     38 
     39 
     40 static void * eap_identity_initPickUp(struct eap_sm *sm)
     41 {
     42 	struct eap_identity_data *data;
     43 	data = eap_identity_init(sm);
     44 	if (data) {
     45 		data->pick_up = 1;
     46 	}
     47 	return data;
     48 }
     49 
     50 
     51 static void eap_identity_reset(struct eap_sm *sm, void *priv)
     52 {
     53 	struct eap_identity_data *data = priv;
     54 	os_free(data);
     55 }
     56 
     57 
     58 static struct wpabuf * eap_identity_buildReq(struct eap_sm *sm, void *priv,
     59 					     u8 id)
     60 {
     61 	struct eap_identity_data *data = priv;
     62 	struct wpabuf *req;
     63 	const char *req_data;
     64 	size_t req_data_len;
     65 
     66 	if (sm->eapol_cb->get_eap_req_id_text) {
     67 		req_data = sm->eapol_cb->get_eap_req_id_text(sm->eapol_ctx,
     68 							     &req_data_len);
     69 	} else {
     70 		req_data = NULL;
     71 		req_data_len = 0;
     72 	}
     73 	req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, req_data_len,
     74 			    EAP_CODE_REQUEST, id);
     75 	if (req == NULL) {
     76 		wpa_printf(MSG_ERROR, "EAP-Identity: Failed to allocate "
     77 			   "memory for request");
     78 		data->state = FAILURE;
     79 		return NULL;
     80 	}
     81 
     82 	wpabuf_put_data(req, req_data, req_data_len);
     83 
     84 	return req;
     85 }
     86 
     87 
     88 static Boolean eap_identity_check(struct eap_sm *sm, void *priv,
     89 				  struct wpabuf *respData)
     90 {
     91 	const u8 *pos;
     92 	size_t len;
     93 
     94 	pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
     95 			       respData, &len);
     96 	if (pos == NULL) {
     97 		wpa_printf(MSG_INFO, "EAP-Identity: Invalid frame");
     98 		return TRUE;
     99 	}
    100 
    101 	return FALSE;
    102 }
    103 
    104 
    105 static void eap_identity_process(struct eap_sm *sm, void *priv,
    106 				 struct wpabuf *respData)
    107 {
    108 	struct eap_identity_data *data = priv;
    109 	const u8 *pos;
    110 	size_t len;
    111 
    112 	if (data->pick_up) {
    113 		if (eap_identity_check(sm, data, respData)) {
    114 			wpa_printf(MSG_DEBUG, "EAP-Identity: failed to pick "
    115 				   "up already started negotiation");
    116 			data->state = FAILURE;
    117 			return;
    118 		}
    119 		data->pick_up = 0;
    120 	}
    121 
    122 	pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
    123 			       respData, &len);
    124 	if (pos == NULL)
    125 		return; /* Should not happen - frame already validated */
    126 
    127 	wpa_hexdump_ascii(MSG_DEBUG, "EAP-Identity: Peer identity", pos, len);
    128 	if (sm->identity)
    129 		sm->update_user = TRUE;
    130 	os_free(sm->identity);
    131 	sm->identity = os_malloc(len ? len : 1);
    132 	if (sm->identity == NULL) {
    133 		data->state = FAILURE;
    134 	} else {
    135 		os_memcpy(sm->identity, pos, len);
    136 		sm->identity_len = len;
    137 		data->state = SUCCESS;
    138 	}
    139 }
    140 
    141 
    142 static Boolean eap_identity_isDone(struct eap_sm *sm, void *priv)
    143 {
    144 	struct eap_identity_data *data = priv;
    145 	return data->state != CONTINUE;
    146 }
    147 
    148 
    149 static Boolean eap_identity_isSuccess(struct eap_sm *sm, void *priv)
    150 {
    151 	struct eap_identity_data *data = priv;
    152 	return data->state == SUCCESS;
    153 }
    154 
    155 
    156 int eap_server_identity_register(void)
    157 {
    158 	struct eap_method *eap;
    159 	int ret;
    160 
    161 	eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
    162 				      EAP_VENDOR_IETF, EAP_TYPE_IDENTITY,
    163 				      "Identity");
    164 	if (eap == NULL)
    165 		return -1;
    166 
    167 	eap->init = eap_identity_init;
    168 	eap->initPickUp = eap_identity_initPickUp;
    169 	eap->reset = eap_identity_reset;
    170 	eap->buildReq = eap_identity_buildReq;
    171 	eap->check = eap_identity_check;
    172 	eap->process = eap_identity_process;
    173 	eap->isDone = eap_identity_isDone;
    174 	eap->isSuccess = eap_identity_isSuccess;
    175 
    176 	ret = eap_server_method_register(eap);
    177 	if (ret)
    178 		eap_server_method_free(eap);
    179 	return ret;
    180 }
    181