eap_gpsk.c

WLAN无线网络管理的最新程序

	rpos += 2;

	if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
				 data->specifier, start, rpos - start, rpos) <
	    0) {
		eap_gpsk_state(data, FAILURE);
		os_free(resp);
		return NULL;
	}

	return (u8 *) resp;
}


const u8 * eap_gpsk_validate_rand(struct eap_gpsk_data *data, const u8 *pos,
				  const u8 *end)
{
	if (end - pos < EAP_GPSK_RAND_LEN) {
		wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for "
			   "RAND_Peer");
		return NULL;
	}
	if (os_memcmp(pos, data->rand_peer, EAP_GPSK_RAND_LEN) != 0) {
		wpa_printf(MSG_DEBUG, "EAP-GPSK: RAND_Peer in GPSK-2 and "
			   "GPSK-3 did not match");
		wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Peer in GPSK-2",
			    data->rand_peer, EAP_GPSK_RAND_LEN);
		wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Peer in GPSK-3",
			    pos, EAP_GPSK_RAND_LEN);
		return NULL;
	}
	pos += EAP_GPSK_RAND_LEN;

	if (end - pos < EAP_GPSK_RAND_LEN) {
		wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for "
			   "RAND_Server");
		return NULL;
	}
	if (os_memcmp(pos, data->rand_server, EAP_GPSK_RAND_LEN) != 0) {
		wpa_printf(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-1 and "
			   "GPSK-3 did not match");
		wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-1",
			    data->rand_server, EAP_GPSK_RAND_LEN);
		wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-3",
			    pos, EAP_GPSK_RAND_LEN);
		return NULL;
	}
	pos += EAP_GPSK_RAND_LEN;

	return pos;
}


const u8 * eap_gpsk_validate_id_server(struct eap_gpsk_data *data,
				       const u8 *pos, const u8 *end)
{
	size_t len;

	if (pos == NULL)
		return NULL;

	if (end - pos < (int) 2) {
		wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for "
			   "length(ID_Server)");
		return NULL;
	}

	len = WPA_GET_BE16(pos);
	pos += 2;

	if (end - pos < (int) len) {
		wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for "
			   "ID_Server");
		return NULL;
	}

	if (len != data->id_server_len ||
	    os_memcmp(pos, data->id_server, len) != 0) {
		wpa_printf(MSG_INFO, "EAP-GPSK: ID_Server did not match with "
			   "the one used in GPSK-1");
		wpa_hexdump_ascii(MSG_DEBUG, "EAP-GPSK: ID_Server in GPSK-1",
				  data->id_server, data->id_server_len);
		wpa_hexdump_ascii(MSG_DEBUG, "EAP-GPSK: ID_Server in GPSK-3",
				  pos, len);
	}

	pos += len;

	return pos;
}


const u8 * eap_gpsk_validate_csuite(struct eap_gpsk_data *data, const u8 *pos,
				    const u8 *end)
{
	int vendor, specifier;
	const struct eap_gpsk_csuite *csuite;

	if (pos == NULL)
		return NULL;

	if (end - pos < (int) sizeof(*csuite)) {
		wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for "
			   "CSuite_Sel");
		return NULL;
	}
	csuite = (const struct eap_gpsk_csuite *) pos;
	vendor = WPA_GET_BE32(csuite->vendor);
	specifier = WPA_GET_BE16(csuite->specifier);
	pos += sizeof(*csuite);
	if (vendor != data->vendor || specifier != data->specifier) {
		wpa_printf(MSG_DEBUG, "EAP-GPSK: CSuite_Sel (%d:%d) does not "
			   "match with the one sent in GPSK-2 (%d:%d)",
			   vendor, specifier, data->vendor, data->specifier);
		return NULL;
	}

	return pos;
}


const u8 * eap_gpsk_validate_pd_payload_2(struct eap_gpsk_data *data,
					  const u8 *pos, const u8 *end)
{
	u16 alen;

	if (pos == NULL)
		return NULL;

	if (end - pos < 2) {
		wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for "
			   "PD_Payload_2 length");
		return NULL;
	}
	alen = WPA_GET_BE16(pos);
	pos += 2;
	if (end - pos < alen) {
		wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for "
			   "%d-octet PD_Payload_2", alen);
		return NULL;
	}
	wpa_hexdump(MSG_DEBUG, "EAP-GPSK: PD_Payload_2", pos, alen);
	pos += alen;

	return pos;
}


const u8 * eap_gpsk_validate_gpsk_3_mic(struct eap_gpsk_data *data,
					const u8 *payload,
					const u8 *pos, const u8 *end)
{
	size_t miclen;
	u8 mic[EAP_GPSK_MAX_MIC_LEN];

	if (pos == NULL)
		return NULL;

	miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
	if (end - pos < (int) miclen) {
		wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for MIC "
			   "(left=%d miclen=%d)", end - pos, miclen);
		return NULL;
	}
	if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
				 data->specifier, payload, pos - payload, mic)
	    < 0) {
		wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to compute MIC");
		return NULL;
	}
	if (os_memcmp(mic, pos, miclen) != 0) {
		wpa_printf(MSG_INFO, "EAP-GPSK: Incorrect MIC in GPSK-3");
		wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Received MIC", pos, miclen);
		wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Computed MIC", mic, miclen);
		return NULL;
	}
	pos += miclen;

	return pos;
}


static u8 * eap_gpsk_process_gpsk_3(struct eap_sm *sm,
				    struct eap_gpsk_data *data,
				    struct eap_method_ret *ret,
				    const u8 *reqData, size_t reqDataLen,
				    const u8 *payload, size_t payload_len,
				    size_t *respDataLen)
{
	u8 *resp;
	const struct eap_hdr *req;
	const u8 *pos, *end;

	if (data->state != GPSK_3) {
		ret->ignore = TRUE;
		return NULL;
	}

	wpa_printf(MSG_DEBUG, "EAP-GPSK: Received Request/GPSK-3");

	end = payload + payload_len;

	pos = eap_gpsk_validate_rand(data, payload, end);
	pos = eap_gpsk_validate_id_server(data, pos, end);
	pos = eap_gpsk_validate_csuite(data, pos, end);
	pos = eap_gpsk_validate_pd_payload_2(data, pos, end);
	pos = eap_gpsk_validate_gpsk_3_mic(data, payload, pos, end);

	if (pos == NULL) {
		eap_gpsk_state(data, FAILURE);
		return NULL;
	}
	if (pos != end) {
		wpa_printf(MSG_DEBUG, "EAP-GPSK: Ignored %d bytes of extra "
			   "data in the end of GPSK-2", end - pos);
	}

	req = (const struct eap_hdr *) reqData;
	resp = eap_gpsk_send_gpsk_4(data, req->identifier, respDataLen);
	if (resp == NULL)
		return NULL;

	eap_gpsk_state(data, SUCCESS);
	ret->methodState = METHOD_DONE;
	ret->decision = DECISION_UNCOND_SUCC;

	return (u8 *) resp;
}


static u8 * eap_gpsk_send_gpsk_4(struct eap_gpsk_data *data, u8 identifier,
				 size_t *respDataLen)
{
	struct eap_hdr *resp;
	u8 *rpos, *start;
	size_t len;

	wpa_printf(MSG_DEBUG, "EAP-GPSK: Sending Response/GPSK-4");

	len = 1 + 2 + eap_gpsk_mic_len(data->vendor, data->specifier);

	resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GPSK, respDataLen, len,
			     EAP_CODE_RESPONSE, identifier, &rpos);
	if (resp == NULL)
		return NULL;

	*rpos++ = EAP_GPSK_OPCODE_GPSK_4;
	start = rpos;

	/* No PD_Payload_3 */
	WPA_PUT_BE16(rpos, 0);
	rpos += 2;

	if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
				 data->specifier, start, rpos - start, rpos) <
	    0) {
		eap_gpsk_state(data, FAILURE);
		os_free(resp);
		return NULL;
	}

	return (u8 *) resp;
}


static u8 * eap_gpsk_process(struct eap_sm *sm, void *priv,
			    struct eap_method_ret *ret,
			    const u8 *reqData, size_t reqDataLen,
			    size_t *respDataLen)
{
	struct eap_gpsk_data *data = priv;
	u8 *resp;
	const u8 *pos;
	size_t len;

	pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GPSK,
			       reqData, reqDataLen, &len);
	if (pos == NULL || len < 1) {
		ret->ignore = TRUE;
		return NULL;
	}

	wpa_printf(MSG_DEBUG, "EAP-GPSK: Received frame: opcode %d", *pos);

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

	switch (*pos) {
	case EAP_GPSK_OPCODE_GPSK_1:
		resp = eap_gpsk_process_gpsk_1(sm, data, ret, reqData,
					       reqDataLen, pos + 1, len - 1,
					       respDataLen);
		break;
	case EAP_GPSK_OPCODE_GPSK_3:
		resp = eap_gpsk_process_gpsk_3(sm, data, ret, reqData,
					       reqDataLen, pos + 1, len - 1,
					       respDataLen);
		break;
	default:
		wpa_printf(MSG_DEBUG, "EAP-GPSK: Ignoring message with "
			   "unknown opcode %d", *pos);
		ret->ignore = TRUE;
		return NULL;
	}

	return resp;
}


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


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

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

	key = os_malloc(EAP_MSK_LEN);
	if (key == NULL)
		return NULL;
	os_memcpy(key, data->msk, EAP_MSK_LEN);
	*len = EAP_MSK_LEN;

	return key;
}


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

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

	key = os_malloc(EAP_EMSK_LEN);
	if (key == NULL)
		return NULL;
	os_memcpy(key, data->emsk, EAP_EMSK_LEN);
	*len = EAP_EMSK_LEN;

	return key;
}


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

	eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
				    EAP_VENDOR_IETF, EAP_TYPE_GPSK, "GPSK");
	if (eap == NULL)
		return -1;

	eap->init = eap_gpsk_init;
	eap->deinit = eap_gpsk_deinit;
	eap->process = eap_gpsk_process;
	eap->isKeyAvailable = eap_gpsk_isKeyAvailable;
	eap->getKey = eap_gpsk_getKey;
	eap->get_emsk = eap_gpsk_get_emsk;

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