eap_ttls.c

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	return 0;
}


#if EAP_TTLS_VERSION > 0
static void eap_ttls_final_phase_finished(struct eap_sm *sm,
					  struct eap_ttls_data *data,
					  struct eap_method_ret *ret,
					  u8 identifier,
					  struct wpabuf **out_data)
{
	wpa_printf(MSG_DEBUG, "EAP-TTLS: FinalPhaseFinished received");
	wpa_printf(MSG_INFO, "EAP-TTLS: TLS/IA authentication succeeded");
	ret->methodState = METHOD_DONE;
	ret->decision = DECISION_UNCOND_SUCC;
	data->phase2_success = 1;
	*out_data = eap_ttls_build_phase_finished(sm, data, identifier, 1);
	eap_ttls_v1_derive_key(sm, data);
}
#endif /* EAP_TTLS_VERSION */


static int eap_ttls_implicit_identity_request(struct eap_sm *sm,
					      struct eap_ttls_data *data,
					      struct eap_method_ret *ret,
					      u8 identifier,
					      struct wpabuf **out_data)
{
	int retval = 0;
	struct eap_hdr *hdr;
	struct wpabuf *resp;

	hdr = (struct eap_hdr *) eap_ttls_fake_identity_request();
	if (hdr == NULL) {
		ret->methodState = METHOD_DONE;
		ret->decision = DECISION_FAIL;
		return -1;
	}

	resp = NULL;
	if (eap_ttls_phase2_request(sm, data, ret, hdr, &resp)) {
		wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request "
			   "processing failed");
		retval = -1;
	} else {
		retval = eap_ttls_encrypt_response(sm, data, resp, identifier,
						   out_data);
	}

	os_free(hdr);

	if (retval < 0) {
		ret->methodState = METHOD_DONE;
		ret->decision = DECISION_FAIL;
	}

	return retval;
}


static int eap_ttls_phase2_start(struct eap_sm *sm, struct eap_ttls_data *data,
				 struct eap_method_ret *ret, u8 identifier,
				 struct wpabuf **out_data)
{
	data->phase2_start = 0;

	/*
	 * EAP-TTLS does not use Phase2 on fast re-auth; this must be done only
	 * if TLS part was indeed resuming a previous session. Most
	 * Authentication Servers terminate EAP-TTLS before reaching this
	 * point, but some do not. Make wpa_supplicant stop phase 2 here, if
	 * needed.
	 */
	if (data->reauth &&
	    tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
		wpa_printf(MSG_DEBUG, "EAP-TTLS: Session resumption - "
			   "skip phase 2");
		*out_data = eap_peer_tls_build_ack(identifier, EAP_TYPE_TTLS,
						   data->ttls_version);
		ret->methodState = METHOD_DONE;
		ret->decision = DECISION_UNCOND_SUCC;
		data->phase2_success = 1;
		return 0;
	}

	return eap_ttls_implicit_identity_request(sm, data, ret, identifier,
						  out_data);
}


static int eap_ttls_decrypt(struct eap_sm *sm, struct eap_ttls_data *data,
			    struct eap_method_ret *ret, u8 identifier,
			    const struct wpabuf *in_data,
			    struct wpabuf **out_data)
{
	struct wpabuf *in_decrypted = NULL;
	int retval = 0;
	struct ttls_parse_avp parse;

	os_memset(&parse, 0, sizeof(parse));

	wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
		   " Phase 2",
		   in_data ? (unsigned long) wpabuf_len(in_data) : 0);

	if (data->pending_phase2_req) {
		wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 request - "
			   "skip decryption and use old data");
		/* Clear TLS reassembly state. */
		eap_peer_tls_reset_input(&data->ssl);

		in_decrypted = data->pending_phase2_req;
		data->pending_phase2_req = NULL;
		if (wpabuf_len(in_decrypted) == 0) {
			wpabuf_free(in_decrypted);
			return eap_ttls_implicit_identity_request(
				sm, data, ret, identifier, out_data);
		}
		goto continue_req;
	}

	if ((in_data == NULL || wpabuf_len(in_data) == 0) &&
	    data->phase2_start) {
		return eap_ttls_phase2_start(sm, data, ret, identifier,
					     out_data);
	}

	if (in_data == NULL || wpabuf_len(in_data) == 0) {
		/* Received TLS ACK - requesting more fragments */
		return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS,
					    data->ttls_version,
					    identifier, NULL, out_data);
	}

	retval = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
	if (retval)
		goto done;

#if EAP_TTLS_VERSION > 0
	if (data->ttls_version > 0 &&
	    (in_decrypted == NULL || wpabuf_len(in_decrypted) == 0) &&
	    tls_connection_ia_final_phase_finished(sm->ssl_ctx,
						   data->ssl.conn)) {
		eap_ttls_final_phase_finished(sm, data, ret, identifier,
					      out_data);
		goto done;
	}
#endif /* EAP_TTLS_VERSION */

continue_req:
	data->phase2_start = 0;

	if (eap_ttls_parse_avps(in_decrypted, &parse) < 0) {
		retval = -1;
		goto done;
	}

	retval = eap_ttls_process_decrypted(sm, data, ret, identifier,
					    &parse, in_decrypted, out_data);

done:
	wpabuf_free(in_decrypted);
	os_free(parse.eapdata);

	if (retval < 0) {
		ret->methodState = METHOD_DONE;
		ret->decision = DECISION_FAIL;
	}

	return retval;
}


static int eap_ttls_process_start(struct eap_sm *sm,
				  struct eap_ttls_data *data, u8 flags,
				  struct eap_method_ret *ret)
{
	struct eap_peer_config *config = eap_get_config(sm);

	wpa_printf(MSG_DEBUG, "EAP-TTLS: Start (server ver=%d, own ver=%d)",
		   flags & EAP_PEAP_VERSION_MASK, data->ttls_version);
#if EAP_TTLS_VERSION > 0
	if ((flags & EAP_PEAP_VERSION_MASK) < data->ttls_version)
		data->ttls_version = flags & EAP_PEAP_VERSION_MASK;
	if (data->force_ttls_version >= 0 &&
	    data->force_ttls_version != data->ttls_version) {
		wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to select "
			   "forced TTLS version %d",
			   data->force_ttls_version);
		ret->methodState = METHOD_DONE;
		ret->decision = DECISION_FAIL;
		ret->allowNotifications = FALSE;
		return -1;
	}
	wpa_printf(MSG_DEBUG, "EAP-TTLS: Using TTLS version %d",
		   data->ttls_version);

	if (data->ttls_version > 0)
		data->ssl.tls_ia = 1;
#endif /* EAP_TTLS_VERSION */
	if (!data->ssl_initialized &&
	    eap_peer_tls_ssl_init(sm, &data->ssl, config)) {
		wpa_printf(MSG_INFO, "EAP-TTLS: Failed to initialize SSL.");
		return -1;
	}
	data->ssl_initialized = 1;

	wpa_printf(MSG_DEBUG, "EAP-TTLS: Start");

	return 0;
}


static int eap_ttls_process_handshake(struct eap_sm *sm,
				      struct eap_ttls_data *data,
				      struct eap_method_ret *ret,
				      u8 identifier,
				      const u8 *in_data, size_t in_len,
				      struct wpabuf **out_data)
{
	int res;

	res = eap_peer_tls_process_helper(sm, &data->ssl, EAP_TYPE_TTLS,
					  data->ttls_version, identifier,
					  in_data, in_len, out_data);

	if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
		wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS done, proceed to "
			   "Phase 2");
		if (data->resuming) {
			wpa_printf(MSG_DEBUG, "EAP-TTLS: fast reauth - may "
				   "skip Phase 2");
			ret->decision = DECISION_COND_SUCC;
			ret->methodState = METHOD_MAY_CONT;
		}
		data->phase2_start = 1;
		if (data->ttls_version == 0)
			eap_ttls_v0_derive_key(sm, data);

		if (*out_data == NULL || wpabuf_len(*out_data) == 0) {
			if (eap_ttls_decrypt(sm, data, ret, identifier,
					     NULL, out_data)) {
				wpa_printf(MSG_WARNING, "EAP-TTLS: "
					   "failed to process early "
					   "start for Phase 2");
			}
			res = 0;
		}
		data->resuming = 0;
	}

	if (res == 2) {
		struct wpabuf msg;
		/*
		 * Application data included in the handshake message.
		 */
		wpabuf_free(data->pending_phase2_req);
		data->pending_phase2_req = *out_data;
		*out_data = NULL;
		wpabuf_set(&msg, in_data, in_len);
		res = eap_ttls_decrypt(sm, data, ret, identifier, &msg,
				       out_data);
	}

	return res;
}


static void eap_ttls_check_auth_status(struct eap_sm *sm, 
				       struct eap_ttls_data *data,
				       struct eap_method_ret *ret)
{
	if (data->ttls_version == 0 && ret->methodState == METHOD_DONE) {
		ret->allowNotifications = FALSE;
		if (ret->decision == DECISION_UNCOND_SUCC ||
		    ret->decision == DECISION_COND_SUCC) {
			wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
				   "completed successfully");
			data->phase2_success = 1;
#ifdef EAP_TNC
			if (!data->ready_for_tnc && !data->tnc_started) {
				/*
				 * TNC may be required as the next
				 * authentication method within the tunnel.
				 */
				ret->methodState = METHOD_MAY_CONT;
				data->ready_for_tnc = 1;
			}
#endif /* EAP_TNC */
		}
	} else if (data->ttls_version == 0 &&
		   ret->methodState == METHOD_MAY_CONT &&
		   (ret->decision == DECISION_UNCOND_SUCC ||
		    ret->decision == DECISION_COND_SUCC)) {
			wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
				   "completed successfully (MAY_CONT)");
			data->phase2_success = 1;
	}
}


static struct wpabuf * eap_ttls_process(struct eap_sm *sm, void *priv,
					struct eap_method_ret *ret,
					const struct wpabuf *reqData)
{
	size_t left;
	int res;
	u8 flags, id;
	struct wpabuf *resp;
	const u8 *pos;
	struct eap_ttls_data *data = priv;

	pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_TTLS, ret,
					reqData, &left, &flags);
	if (pos == NULL)
		return NULL;
	id = eap_get_id(reqData);

	if (flags & EAP_TLS_FLAGS_START) {
		if (eap_ttls_process_start(sm, data, flags, ret) < 0)
			return NULL;

		/* RFC 5281, Ch. 9.2:
		 * "This packet MAY contain additional information in the form
		 * of AVPs, which may provide useful hints to the client"
		 * For now, ignore any potential extra data.
		 */
		left = 0;
	} else if (!data->ssl_initialized) {
		wpa_printf(MSG_DEBUG, "EAP-TTLS: First message did not "
			   "include Start flag");
		ret->methodState = METHOD_DONE;
		ret->decision = DECISION_FAIL;
		ret->allowNotifications = FALSE;
		return NULL;
	}

	resp = NULL;
	if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
	    !data->resuming) {
		struct wpabuf msg;
		wpabuf_set(&msg, pos, left);
		res = eap_ttls_decrypt(sm, data, ret, id, &msg, &resp);
	} else {
		res = eap_ttls_process_handshake(sm, data, ret, id,
						 pos, left, &resp);
	}

	eap_ttls_check_auth_status(sm, data, ret);

	/* FIX: what about res == -1? Could just move all error processing into
	 * the other functions and get rid of this res==1 case here. */
	if (res == 1) {
		wpabuf_free(resp);
		return eap_peer_tls_build_ack(id, EAP_TYPE_TTLS,
					      data->ttls_version);
	}
	return resp;
}


static Boolean eap_ttls_has_reauth_data(struct eap_sm *sm, void *priv)
{
	struct eap_ttls_data *data = priv;
	return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
		data->phase2_success;
}


static void eap_ttls_deinit_for_reauth(struct eap_sm *sm, void *priv)
{
	struct eap_ttls_data *data = priv;
	wpabuf_free(data->pending_phase2_req);
	data->pending_phase2_req = NULL;
#ifdef EAP_TNC
	data->ready_for_tnc = 0;
	data->tnc_started = 0;
#endif /* EAP_TNC */
}


static void * eap_ttls_init_for_reauth(struct eap_sm *sm, void *priv)
{
	struct eap_ttls_data *data = priv;
	os_free(data->key_data);
	data->key_data = NULL;
	if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
		os_free(data);
		return NULL;
	}
	if (data->phase2_priv && data->phase2_method &&
	    data->phase2_method->init_for_reauth)
		data->phase2_method->init_for_reauth(sm, data->phase2_priv);
	data->phase2_start = 0;
	data->phase2_success = 0;
	data->resuming = 1;
	data->reauth = 1;
	return priv;
}


static int eap_ttls_get_status(struct eap_sm *sm, void *priv, char *buf,
			       size_t buflen, int verbose)
{
	struct eap_ttls_data *data = priv;
	int len, ret;

	len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
	ret = os_snprintf(buf + len, buflen - len,
			  "EAP-TTLSv%d Phase2 method=",
			  data->ttls_version);
	if (ret < 0 || (size_t) ret >= buflen - len)
		return len;
	len += ret;
	switch (data->phase2_type) {
	case EAP_TTLS_PHASE2_EAP:
		ret = os_snprintf(buf + len, buflen - len, "EAP-%s\n",
				  data->phase2_method ?
				  data->phase2_method->name : "?");
		break;
	case EAP_TTLS_PHASE2_MSCHAPV2:
		ret = os_snprintf(buf + len, buflen - len, "MSCHAPV2\n");
		break;
	case EAP_TTLS_PHASE2_MSCHAP:
		ret = os_snprintf(buf + len, buflen - len, "MSCHAP\n");
		break;
	case EAP_TTLS_PHASE2_PAP:
		ret = os_snprintf(buf + len, buflen - len, "PAP\n");
		break;
	case EAP_TTLS_PHASE2_CHAP:
		ret = os_snprintf(buf + len, buflen - len, "CHAP\n");
		break;
	default:
		ret = 0;
		break;
	}
	if (ret < 0 || (size_t) ret >= buflen - len)
		return len;
	len += ret;

	return len;
}


static Boolean eap_ttls_isKeyAvailable(struct eap_sm *sm, void *priv)
{
	struct eap_ttls_data *data = priv;
	return data->key_data != NULL && data->phase2_success;
}


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

	if (data->key_data == NULL || !data->phase2_success)
		return NULL;

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

	*len = EAP_TLS_KEY_LEN;
	os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);

	return key;
}


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

	eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
				    EAP_VENDOR_IETF, EAP_TYPE_TTLS, "TTLS");
	if (eap == NULL)
		return -1;

	eap->init = eap_ttls_init;
	eap->deinit = eap_ttls_deinit;
	eap->process = eap_ttls_process;
	eap->isKeyAvailable = eap_ttls_isKeyAvailable;
	eap->getKey = eap_ttls_getKey;
	eap->get_status = eap_ttls_get_status;
	eap->has_reauth_data = eap_ttls_has_reauth_data;
	eap->deinit_for_reauth = eap_ttls_deinit_for_reauth;
	eap->init_for_reauth = eap_ttls_init_for_reauth;

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