eap_aka.c

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		wpa_printf(MSG_WARNING, "EAP-AKA: Notification message after "
			   "reauth did not include encrypted data");
		return -1;
	}

	decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
				       attr->encr_data_len, attr->iv, &eattr,
				       0);
	if (decrypted == NULL) {
		wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
			   "data from notification message");
		return -1;
	}

	if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
		wpa_printf(MSG_WARNING, "EAP-AKA: Counter in notification "
			   "message does not match with counter in reauth "
			   "message");
		os_free(decrypted);
		return -1;
	}

	os_free(decrypted);
	return 0;
}


static int eap_aka_process_notification_auth(struct eap_aka_data *data,
					     const struct wpabuf *reqData,
					     struct eap_sim_attrs *attr)
{
	if (attr->mac == NULL) {
		wpa_printf(MSG_INFO, "EAP-AKA: no AT_MAC in after_auth "
			   "Notification message");
		return -1;
	}

	if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
		wpa_printf(MSG_WARNING, "EAP-AKA: Notification message "
			   "used invalid AT_MAC");
		return -1;
	}

	if (data->reauth &&
	    eap_aka_process_notification_reauth(data, attr)) {
		wpa_printf(MSG_WARNING, "EAP-AKA: Invalid notification "
			   "message after reauth");
		return -1;
	}

	return 0;
}


static struct wpabuf * eap_aka_process_notification(
	struct eap_sm *sm, struct eap_aka_data *data, u8 id,
	const struct wpabuf *reqData, struct eap_sim_attrs *attr)
{
	wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Notification");
	if (data->num_notification > 0) {
		wpa_printf(MSG_INFO, "EAP-AKA: too many notification "
			   "rounds (only one allowed)");
		return eap_aka_client_error(data, id,
					    EAP_AKA_UNABLE_TO_PROCESS_PACKET);
	}
	data->num_notification++;
	if (attr->notification == -1) {
		wpa_printf(MSG_INFO, "EAP-AKA: no AT_NOTIFICATION in "
			   "Notification message");
		return eap_aka_client_error(data, id,
					    EAP_AKA_UNABLE_TO_PROCESS_PACKET);
	}

	if ((attr->notification & 0x4000) == 0 &&
	    eap_aka_process_notification_auth(data, reqData, attr)) {
		return eap_aka_client_error(data, id,
					    EAP_AKA_UNABLE_TO_PROCESS_PACKET);
	}

	eap_sim_report_notification(sm->msg_ctx, attr->notification, 1);
	if (attr->notification >= 0 && attr->notification < 32768) {
		eap_aka_state(data, FAILURE);
	} else if (attr->notification == EAP_SIM_SUCCESS &&
		   data->state == RESULT_SUCCESS)
		eap_aka_state(data, SUCCESS);
	return eap_aka_response_notification(data, id, attr->notification);
}


static struct wpabuf * eap_aka_process_reauthentication(
	struct eap_sm *sm, struct eap_aka_data *data, u8 id,
	const struct wpabuf *reqData, struct eap_sim_attrs *attr)
{
	struct eap_sim_attrs eattr;
	u8 *decrypted;

	wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Reauthentication");

	if (attr->checkcode &&
	    eap_aka_verify_checkcode(data, attr->checkcode,
				     attr->checkcode_len)) {
		wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
			   "message");
		return eap_aka_client_error(data, id,
					    EAP_AKA_UNABLE_TO_PROCESS_PACKET);
	}

	if (data->reauth_id == NULL) {
		wpa_printf(MSG_WARNING, "EAP-AKA: Server is trying "
			   "reauthentication, but no reauth_id available");
		return eap_aka_client_error(data, id,
					    EAP_AKA_UNABLE_TO_PROCESS_PACKET);
	}

	data->reauth = 1;
	if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
		wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
			   "did not have valid AT_MAC");
		return eap_aka_client_error(data, id,
					    EAP_AKA_UNABLE_TO_PROCESS_PACKET);
	}

	if (attr->encr_data == NULL || attr->iv == NULL) {
		wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
			   "message did not include encrypted data");
		return eap_aka_client_error(data, id,
					    EAP_AKA_UNABLE_TO_PROCESS_PACKET);
	}

	decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
				       attr->encr_data_len, attr->iv, &eattr,
				       0);
	if (decrypted == NULL) {
		wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
			   "data from reauthentication message");
		return eap_aka_client_error(data, id,
					    EAP_AKA_UNABLE_TO_PROCESS_PACKET);
	}

	if (eattr.nonce_s == NULL || eattr.counter < 0) {
		wpa_printf(MSG_INFO, "EAP-AKA: (encr) No%s%s in reauth packet",
			   !eattr.nonce_s ? " AT_NONCE_S" : "",
			   eattr.counter < 0 ? " AT_COUNTER" : "");
		os_free(decrypted);
		return eap_aka_client_error(data, id,
					    EAP_AKA_UNABLE_TO_PROCESS_PACKET);
	}

	if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
		struct wpabuf *res;
		wpa_printf(MSG_INFO, "EAP-AKA: (encr) Invalid counter "
			   "(%d <= %d)", eattr.counter, data->counter);
		data->counter_too_small = eattr.counter;

		/* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
		 * reauth_id must not be used to start a new reauthentication.
		 * However, since it was used in the last EAP-Response-Identity
		 * packet, it has to saved for the following fullauth to be
		 * used in MK derivation. */
		os_free(data->last_eap_identity);
		data->last_eap_identity = data->reauth_id;
		data->last_eap_identity_len = data->reauth_id_len;
		data->reauth_id = NULL;
		data->reauth_id_len = 0;

		res = eap_aka_response_reauth(data, id, 1, eattr.nonce_s);
		os_free(decrypted);

		return res;
	}
	data->counter = eattr.counter;

	os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
	wpa_hexdump(MSG_DEBUG, "EAP-AKA: (encr) AT_NONCE_S",
		    data->nonce_s, EAP_SIM_NONCE_S_LEN);

	if (data->eap_method == EAP_TYPE_AKA_PRIME) {
		eap_aka_prime_derive_keys_reauth(data->k_re, data->counter,
						 data->reauth_id,
						 data->reauth_id_len,
						 data->nonce_s,
						 data->msk, data->emsk);
	} else {
		eap_sim_derive_keys_reauth(data->counter, data->reauth_id,
					   data->reauth_id_len,
					   data->nonce_s, data->mk,
					   data->msk, data->emsk);
	}
	eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
	eap_aka_learn_ids(data, &eattr);

	if (data->result_ind && attr->result_ind)
		data->use_result_ind = 1;

	if (data->state != FAILURE && data->state != RESULT_FAILURE) {
		eap_aka_state(data, data->use_result_ind ?
			      RESULT_SUCCESS : SUCCESS);
	}

	data->num_id_req = 0;
	data->num_notification = 0;
	if (data->counter > EAP_AKA_MAX_FAST_REAUTHS) {
		wpa_printf(MSG_DEBUG, "EAP-AKA: Maximum number of "
			   "fast reauths performed - force fullauth");
		eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
	}
	os_free(decrypted);
	return eap_aka_response_reauth(data, id, 0, data->nonce_s);
}


static struct wpabuf * eap_aka_process(struct eap_sm *sm, void *priv,
				       struct eap_method_ret *ret,
				       const struct wpabuf *reqData)
{
	struct eap_aka_data *data = priv;
	const struct eap_hdr *req;
	u8 subtype, id;
	struct wpabuf *res;
	const u8 *pos;
	struct eap_sim_attrs attr;
	size_t len;

	wpa_hexdump_buf(MSG_DEBUG, "EAP-AKA: EAP data", reqData);
	if (eap_get_config_identity(sm, &len) == NULL) {
		wpa_printf(MSG_INFO, "EAP-AKA: Identity not configured");
		eap_sm_request_identity(sm);
		ret->ignore = TRUE;
		return NULL;
	}

	pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, reqData,
			       &len);
	if (pos == NULL || len < 1) {
		ret->ignore = TRUE;
		return NULL;
	}
	req = wpabuf_head(reqData);
	id = req->identifier;
	len = be_to_host16(req->length);

	ret->ignore = FALSE;
	ret->methodState = METHOD_MAY_CONT;
	ret->decision = DECISION_FAIL;
	ret->allowNotifications = TRUE;

	subtype = *pos++;
	wpa_printf(MSG_DEBUG, "EAP-AKA: Subtype=%d", subtype);
	pos += 2; /* Reserved */

	if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr,
			       data->eap_method == EAP_TYPE_AKA_PRIME ? 2 : 1,
			       0)) {
		res = eap_aka_client_error(data, id,
					   EAP_AKA_UNABLE_TO_PROCESS_PACKET);
		goto done;
	}

	switch (subtype) {
	case EAP_AKA_SUBTYPE_IDENTITY:
		res = eap_aka_process_identity(sm, data, id, reqData, &attr);
		break;
	case EAP_AKA_SUBTYPE_CHALLENGE:
		res = eap_aka_process_challenge(sm, data, id, reqData, &attr);
		break;
	case EAP_AKA_SUBTYPE_NOTIFICATION:
		res = eap_aka_process_notification(sm, data, id, reqData,
						   &attr);
		break;
	case EAP_AKA_SUBTYPE_REAUTHENTICATION:
		res = eap_aka_process_reauthentication(sm, data, id, reqData,
						       &attr);
		break;
	case EAP_AKA_SUBTYPE_CLIENT_ERROR:
		wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Client-Error");
		res = eap_aka_client_error(data, id,
					   EAP_AKA_UNABLE_TO_PROCESS_PACKET);
		break;
	default:
		wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown subtype=%d", subtype);
		res = eap_aka_client_error(data, id,
					   EAP_AKA_UNABLE_TO_PROCESS_PACKET);
		break;
	}

done:
	if (data->state == FAILURE) {
		ret->decision = DECISION_FAIL;
		ret->methodState = METHOD_DONE;
	} else if (data->state == SUCCESS) {
		ret->decision = data->use_result_ind ?
			DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
		/*
		 * It is possible for the server to reply with AKA
		 * Notification, so we must allow the method to continue and
		 * not only accept EAP-Success at this point.
		 */
		ret->methodState = data->use_result_ind ?
			METHOD_DONE : METHOD_MAY_CONT;
	} else if (data->state == RESULT_FAILURE)
		ret->methodState = METHOD_CONT;
	else if (data->state == RESULT_SUCCESS)
		ret->methodState = METHOD_CONT;

	if (ret->methodState == METHOD_DONE) {
		ret->allowNotifications = FALSE;
	}

	return res;
}


static Boolean eap_aka_has_reauth_data(struct eap_sm *sm, void *priv)
{
	struct eap_aka_data *data = priv;
	return data->pseudonym || data->reauth_id;
}


static void eap_aka_deinit_for_reauth(struct eap_sm *sm, void *priv)
{
	struct eap_aka_data *data = priv;
	eap_aka_clear_identities(data, CLEAR_EAP_ID);
	data->prev_id = -1;
	wpabuf_free(data->id_msgs);
	data->id_msgs = NULL;
	data->use_result_ind = 0;
	data->kdf_negotiation = 0;
}


static void * eap_aka_init_for_reauth(struct eap_sm *sm, void *priv)
{
	struct eap_aka_data *data = priv;
	data->num_id_req = 0;
	data->num_notification = 0;
	eap_aka_state(data, CONTINUE);
	return priv;
}


static const u8 * eap_aka_get_identity(struct eap_sm *sm, void *priv,
				       size_t *len)
{
	struct eap_aka_data *data = priv;

	if (data->reauth_id) {
		*len = data->reauth_id_len;
		return data->reauth_id;
	}

	if (data->pseudonym) {
		*len = data->pseudonym_len;
		return data->pseudonym;
	}

	return NULL;
}


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


static u8 * eap_aka_getKey(struct eap_sm *sm, void *priv, size_t *len)
{
	struct eap_aka_data *data = priv;
	u8 *key;

	if (data->state != SUCCESS)
		return NULL;

	key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
	if (key == NULL)
		return NULL;

	*len = EAP_SIM_KEYING_DATA_LEN;
	os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);

	return key;
}


static u8 * eap_aka_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
{
	struct eap_aka_data *data = priv;
	u8 *key;

	if (data->state != SUCCESS)
		return NULL;

	key = os_malloc(EAP_EMSK_LEN);
	if (key == NULL)
		return NULL;

	*len = EAP_EMSK_LEN;
	os_memcpy(key, data->emsk, EAP_EMSK_LEN);

	return key;
}


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

	eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
				    EAP_VENDOR_IETF, EAP_TYPE_AKA, "AKA");
	if (eap == NULL)
		return -1;

	eap->init = eap_aka_init;
	eap->deinit = eap_aka_deinit;
	eap->process = eap_aka_process;
	eap->isKeyAvailable = eap_aka_isKeyAvailable;
	eap->getKey = eap_aka_getKey;
	eap->has_reauth_data = eap_aka_has_reauth_data;
	eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
	eap->init_for_reauth = eap_aka_init_for_reauth;
	eap->get_identity = eap_aka_get_identity;
	eap->get_emsk = eap_aka_get_emsk;

	ret = eap_peer_method_register(eap);
	if (ret)
		eap_peer_method_free(eap);
	return ret;
}


#ifdef EAP_AKA_PRIME
int eap_peer_aka_prime_register(void)
{
	struct eap_method *eap;
	int ret;

	eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
				    EAP_VENDOR_IETF, EAP_TYPE_AKA_PRIME,
				    "AKA'");
	if (eap == NULL)
		return -1;

	eap->init = eap_aka_prime_init;
	eap->deinit = eap_aka_deinit;
	eap->process = eap_aka_process;
	eap->isKeyAvailable = eap_aka_isKeyAvailable;
	eap->getKey = eap_aka_getKey;
	eap->has_reauth_data = eap_aka_has_reauth_data;
	eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
	eap->init_for_reauth = eap_aka_init_for_reauth;
	eap->get_identity = eap_aka_get_identity;
	eap->get_emsk = eap_aka_get_emsk;

	ret = eap_peer_method_register(eap);
	if (ret)
		eap_peer_method_free(eap);

	return ret;
}
#endif /* EAP_AKA_PRIME */