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461 lines
12 KiB
461 lines
12 KiB
/* eslint-disable no-bitwise */
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import * as tls from 'tls';
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import * as NodeCache from 'node-cache';
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import { RadiusPacket } from 'radius';
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import { encodeTunnelPW, ITLSServer, startTLSServer } from '../../../tls/crypt';
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import { ResponseAuthHandler } from '../../../types/Handler';
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import { PAPChallenge } from './challenges/PAPChallenge';
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import { IPacketHandlerResult, PacketResponseCode } from '../../../types/PacketHandler';
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import { MAX_RADIUS_ATTRIBUTE_SIZE, newDeferredPromise } from '../../../helpers';
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import { IEAPMethod } from '../../../types/EAPMethod';
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import { IAuthentication } from '../../../types/Authentication';
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import { secret } from '../../../../config';
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interface IEAPResponseHandlers {
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response: (respData?: Buffer, msgType?: number) => void;
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checkAuth: ResponseAuthHandler;
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}
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/* const handlers = {
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response: (EAPMessage: Buffer) => {
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const attributes: any = [['State', Buffer.from(state)]];
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let sentDataSize = 0;
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do {
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if (EAPMessage.length > 0) {
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attributes.push([
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'EAP-Message',
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EAPMessage.slice(sentDataSize, sentDataSize + MAX_RADIUS_ATTRIBUTE_SIZE)
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]);
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sentDataSize += MAX_RADIUS_ATTRIBUTE_SIZE;
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}
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} while (sentDataSize < EAPMessage.length);
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const response = radius.encode_response({
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packet,
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code: 'Access-Challenge',
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secret: this.secret,
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attributes
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});
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waitForNextMsg[state] = newDeferredPromise();
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server.sendToClient(
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response,
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rinfo.port,
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rinfo.address,
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function(err, _bytes) {
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if (err) {
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console.log('Error sending response to ', rinfo);
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}
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},
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state
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);
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return waitForNextMsg[state].promise;
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},
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checkAuth
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};
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const attributes: any = [['State', Buffer.from(stateID)]];
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let sentDataSize = 0;
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do {
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if (EAPMessage.length > 0) {
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attributes.push([
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'EAP-Message',
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EAPMessage.slice(sentDataSize, sentDataSize + MAX_RADIUS_ATTRIBUTE_SIZE)
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]);
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sentDataSize += MAX_RADIUS_ATTRIBUTE_SIZE;
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}
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} while (sentDataSize < EAPMessage.length);
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const response = radius.encode_response({
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packet,
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code: 'Access-Challenge',
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secret: this.secret,
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attributes
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});
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waitForNextMsg[stateID] = newDeferredPromise();
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server.sendToClient(
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response,
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rinfo.port,
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rinfo.address,
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function(err, _bytes) {
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if (err) {
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console.log('Error sending response to ', rinfo);
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}
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},
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stateID
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);
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return waitForNextMsg[stateID].promise;
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*/
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/* if (waitForNextMsg[state]) {
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const identifier = attributes['EAP-Message'].slice(1, 2).readUInt8(0); // .toString('hex');
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waitForNextMsg[state].resolve({ response: handlers.response, identifier });
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} */
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function tlsHasExportKeyingMaterial(
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tlsSocket: any
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): tlsSocket is {
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exportKeyingMaterial: (length: number, label: string, context?: Buffer) => Buffer;
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} {
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return typeof (tlsSocket as any).exportKeyingMaterial === 'function';
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}
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export class EAPTTLS implements IEAPMethod {
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private papChallenge: PAPChallenge = new PAPChallenge();
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// { [key: string]: Buffer } = {};
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private queueData = new NodeCache({ useClones: false, stdTTL: 60 }); // queue data maximum for 60 seconds
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private openTLSSockets = new NodeCache({ useClones: false, stdTTL: 3600 }); // keep sockets for about one hour
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getEAPType(): number {
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return 21;
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}
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identify(identifier: number, stateID: string): IPacketHandlerResult {
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return this.buildEAPTTLSResponse(identifier, 21, 0x20, stateID);
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}
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constructor(private authentication: IAuthentication) {}
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private buildEAPTTLSResponse(
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identifier: number,
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msgType = 21,
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msgFlags = 0x00,
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stateID: string,
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data?: Buffer,
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newResponse = true
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): IPacketHandlerResult {
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const maxSize = (MAX_RADIUS_ATTRIBUTE_SIZE - 5) * 4;
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console.log('maxSize', maxSize);
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/* it's the first one and we have more, therefore include length */
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const includeLength = data && newResponse && data.length > maxSize;
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// extract data party
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const dataToSend = data && data.length > 0 && data.slice(0, maxSize);
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const dataToQueue = data && data.length > maxSize && data.slice(maxSize);
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/*
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0 1 2 3 4 5 6 7 8
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+-+-+-+-+-+-+-+-+
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|L M R R R R R R|
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+-+-+-+-+-+-+-+-+
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L = Length included
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M = More fragments
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R = Reserved
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The L bit (length included) is set to indicate the presence of the
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four-octet TLS Message Length field, and MUST be set for the first
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fragment of a fragmented TLS message or set of messages. The M
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bit (more fragments) is set on all but the last fragment.
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Implementations of this specification MUST set the reserved bits
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to zero, and MUST ignore them on reception.
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*/
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const flags =
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msgFlags +
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(includeLength ? 0b10000000 : 0) + // set L bit
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(dataToQueue && dataToQueue.length > 0 ? 0b01000000 : 0); // we have more data to come, set M bit
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let buffer = Buffer.from([
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1, // request
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identifier + 1, // increase id by 1
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0, // length (1/2)
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0, // length (2/2)
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msgType, // 1 = identity, 21 = EAP-TTLS, 2 = notificaiton, 4 = md5-challenge, 3 = NAK
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flags // flags: 000000 (L include lenghts, M .. more to come)
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]);
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// append length
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if (includeLength && data) {
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const length = Buffer.alloc(4);
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length.writeInt32BE(data.byteLength, 0);
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buffer = Buffer.concat([buffer, length]);
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}
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// build final buffer with data
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const resBuffer = dataToSend ? Buffer.concat([buffer, dataToSend]) : buffer;
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// set EAP length header
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resBuffer.writeUInt16BE(resBuffer.byteLength, 2);
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console.log('<<<<<<<<<<<< EAP RESPONSE TO CLIENT', {
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code: 1,
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identifier: identifier + 1,
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includeLength,
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dataLength: (data && data.byteLength) || 0,
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msgType: msgType.toString(10),
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flags: `00000000${flags.toString(2)}`.substr(-8),
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data
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});
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if (dataToQueue) {
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// we couldn't send all at once, queue the rest and send later
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this.queueData.set(stateID, dataToQueue);
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} else {
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this.queueData.del(stateID);
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}
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const attributes: any = [['State', Buffer.from(stateID)]];
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let sentDataSize = 0;
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do {
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if (resBuffer.length > 0) {
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attributes.push([
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'EAP-Message',
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resBuffer.slice(sentDataSize, sentDataSize + MAX_RADIUS_ATTRIBUTE_SIZE)
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]);
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sentDataSize += MAX_RADIUS_ATTRIBUTE_SIZE;
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}
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} while (sentDataSize < resBuffer.length);
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return {
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code: PacketResponseCode.AccessChallenge,
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attributes
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};
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}
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decodeTTLSMessage(msg: Buffer) {
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/**
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* The EAP-TTLS packet format is shown below. The fields are
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transmitted left to right.
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Code | Identifier | Length |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type | Flags | Message Length
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Message Length | Data...
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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const flags = msg.slice(5, 6).readUInt8(0); // .toString('hex');
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/*
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0 1 2 3 4 5 6 7
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+---+---+---+---+---+---+---+---+
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| L | M | S | R | R | V |
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+---+---+---+---+---+---+---+---+
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L = Length included
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M = More fragments
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S = Start
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R = Reserved
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V = Version (000 for EAP-TTLSv0)
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*/
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const decodedFlags = {
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// L
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lengthIncluded: flags & 0b010000000,
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// M
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moreFragments: flags & 0b001000000,
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// S
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start: flags & 0b000100000,
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// R
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// reserved: flags & 0b000011000,
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// V
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version: flags & 0b010000111
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};
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let msglength;
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if (decodedFlags.lengthIncluded) {
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msglength = msg.slice(6, 10).readInt32BE(0); // .readDoubleLE(0); // .toString('hex');
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}
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const data = msg.slice(decodedFlags.lengthIncluded ? 10 : 6, msg.length);
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return {
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decodedFlags,
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msglength,
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data
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};
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}
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authResponse(
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identifier: number,
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success: boolean,
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socket: tls.TLSSocket,
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packet: RadiusPacket
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): IPacketHandlerResult {
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const buffer = Buffer.from([
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success ? 3 : 4, // 3.. success, 4... failure
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identifier + 1,
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0, // length (1/2)
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4 // length (2/2)
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]);
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const attributes: any[] = [];
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attributes.push(['EAP-Message', buffer]);
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if (packet.attributes && packet.attributes['User-Name']) {
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// reappend username to response
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attributes.push(['User-Name', packet.attributes['User-Name']]);
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}
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/*
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if (sess->eap_if->eapKeyDataLen > 64) {
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len = 32;
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} else {
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len = sess->eap_if->eapKeyDataLen / 2;
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}
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*/
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if (tlsHasExportKeyingMaterial(socket)) {
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const keyingMaterial = (socket as any).exportKeyingMaterial(128, 'ttls keying material');
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// console.log('keyingMaterial', keyingMaterial);
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// eapKeyData + len
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attributes.push([
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'Vendor-Specific',
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311,
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[
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[
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16,
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encodeTunnelPW(
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keyingMaterial.slice(64),
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(packet as any).authenticator,
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// params.packet.attributes['Message-Authenticator'],
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secret
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)
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]
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]
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]); // MS-MPPE-Send-Key
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// eapKeyData
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attributes.push([
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'Vendor-Specific',
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311,
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[
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[
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17,
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encodeTunnelPW(
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keyingMaterial.slice(0, 64),
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(packet as any).authenticator,
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// params.packet.attributes['Message-Authenticator'],
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secret
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)
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]
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]
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]); // MS-MPPE-Recv-Key
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} else {
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console.error(
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'FATAL: no exportKeyingMaterial method available!!!, you need latest NODE JS, see https://github.com/nodejs/node/pull/31814'
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);
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}
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return {
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code: success ? PacketResponseCode.AccessAccept : PacketResponseCode.AccessReject,
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attributes
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};
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}
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async handleMessage(
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identifier: number,
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stateID: string,
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msg: Buffer,
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orgRadiusPacket: RadiusPacket
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): Promise<IPacketHandlerResult> {
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const { decodedFlags, msglength, data } = this.decodeTTLSMessage(msg);
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// check if no data package is there and we have something in the queue, if so.. empty the queue first
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if (!data || data.length === 0) {
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console.warn(
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`>>>>>>>>>>>> REQUEST FROM CLIENT: EAP TTLS, ACK / NACK (no data, just a confirmation, ID: ${identifier})`
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);
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const queuedData = this.queueData.get(stateID);
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if (queuedData instanceof Buffer && queuedData.length > 0) {
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return this.buildEAPTTLSResponse(identifier, 21, 0x00, stateID, queuedData, false);
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}
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return {};
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}
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console.log('>>>>>>>>>>>> REQUEST FROM CLIENT: EAP TTLS', {
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// flags: `00000000${flags.toString(2)}`.substr(-8),
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decodedFlags,
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identifier,
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msglength
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// data,
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// dataStr: data.toString()
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});
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let connection = this.openTLSSockets.get(stateID) as ITLSServer;
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if (!connection) {
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connection = startTLSServer();
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this.openTLSSockets.set(stateID, connection);
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connection.events.on('end', () => {
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// cleanup socket
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console.log('ENDING SOCKET');
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this.openTLSSockets.del(stateID);
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});
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}
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const sendResponsePromise = newDeferredPromise();
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const incomingMessageHandler = async (incomingData: Buffer) => {
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const type = incomingData.slice(3, 4).readUInt8(0);
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// const code = data.slice(4, 5).readUInt8(0);
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switch (type) {
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case 1: // PAP / CHAP
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try {
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const { username, password } = this.papChallenge.decode(incomingData);
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const authResult = await this.authentication.authenticate(username, password);
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sendResponsePromise.resolve(
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this.authResponse(identifier, authResult, connection.tls, orgRadiusPacket)
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);
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} catch (err) {
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// pwd not found..
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console.error('pwd not found', err);
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connection.events.emit('end');
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// NAK
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sendResponsePromise.resolve(this.buildEAPTTLSResponse(identifier, 3, 0, stateID));
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}
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break;
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default:
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console.log('data', incomingData);
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console.log('data str', incomingData.toString());
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// currentConnection!.events.emit('end');
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console.log('UNSUPPORTED AUTH TYPE, requesting PAP');
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// throw new Error(`unsupported auth type${type}`);
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sendResponsePromise.resolve(
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this.buildEAPTTLSResponse(identifier, 3, 0, stateID, Buffer.from([1]))
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);
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}
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};
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const responseHandler = (encryptedResponseData: Buffer) => {
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// send back...
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sendResponsePromise.resolve(
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this.buildEAPTTLSResponse(identifier, 21, 0x00, stateID, encryptedResponseData)
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);
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};
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// register event listeners
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connection.events.on('incoming', incomingMessageHandler);
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connection.events.on('response', responseHandler);
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// emit data to tls server
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connection.events.emit('send', data);
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const responseData = await sendResponsePromise.promise;
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// cleanup
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connection.events.off('incoming', incomingMessageHandler);
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connection.events.off('response', responseHandler);
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// send response
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return responseData; // this.buildEAPTTLSResponse(identifier, 21, 0x00, stateID, encryptedResponseData);
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}
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}
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