482 lines
14 KiB
TypeScript
482 lines
14 KiB
TypeScript
/**
|
|
* Copyright 2013-2020 GenieACS Inc.
|
|
*
|
|
* This file is part of GenieACS.
|
|
*
|
|
* GenieACS is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as
|
|
* published by the Free Software Foundation, either version 3 of the
|
|
* License, or (at your option) any later version.
|
|
*
|
|
* GenieACS is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Affero General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Affero General Public License
|
|
* along with GenieACS. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
import * as net from "net";
|
|
import * as tls from "tls";
|
|
import { EventEmitter } from "events";
|
|
import { createHash, createHmac, randomBytes } from "crypto";
|
|
import { parseXml, Element, parseAttrs } from "./xml-parser";
|
|
|
|
function encodeBase64(str: string): string {
|
|
return Buffer.from(str).toString("base64");
|
|
}
|
|
|
|
function decodeBase64(str: string): string {
|
|
return Buffer.from(str, "base64").toString();
|
|
}
|
|
|
|
function detectStreamTag(data: string): number {
|
|
const i1 = data.indexOf("<stream:stream");
|
|
if (i1 < 0) throw new Error("Cannot detect opening stream tag");
|
|
const i2 = data.indexOf(">", i1);
|
|
if (i2 < 0) throw new Error("Cannot detect opening stream tag");
|
|
return i2 + 1;
|
|
}
|
|
|
|
function xmppStream<T>(
|
|
socket: net.Socket,
|
|
callback: Generator<void, T, Element>
|
|
): Promise<T> {
|
|
return new Promise((resolve, reject) => {
|
|
const onError = (err: Error): void => {
|
|
socket.removeListener("error", onError);
|
|
reject(err);
|
|
};
|
|
socket.on("error", onError);
|
|
|
|
const onData = (chunk: Buffer): void => {
|
|
try {
|
|
const str = chunk.toString("utf8");
|
|
const xml = parseXml(str);
|
|
const { value, done } = callback.next(xml.children[0]);
|
|
if (done) {
|
|
socket.removeListener("error", onError);
|
|
socket.removeListener("data", onData);
|
|
resolve(value as T);
|
|
}
|
|
} catch (err) {
|
|
socket.removeListener("error", onError);
|
|
socket.removeListener("data", onData);
|
|
reject(err);
|
|
}
|
|
};
|
|
|
|
socket.once("data", (chunk: Buffer) => {
|
|
try {
|
|
const str = chunk.toString("utf8");
|
|
const i = detectStreamTag(str);
|
|
const streamTagStr = str.slice(0, i);
|
|
const xml = parseXml(streamTagStr + "</stream:stream>");
|
|
callback.next(xml.children[0]);
|
|
chunk = chunk.slice(Buffer.byteLength(streamTagStr));
|
|
if (chunk.length) onData(chunk);
|
|
socket.on("data", onData);
|
|
} catch (err) {
|
|
socket.removeListener("error", onError);
|
|
socket.removeListener("data", onData);
|
|
reject(err);
|
|
}
|
|
});
|
|
|
|
try {
|
|
callback.next();
|
|
} catch (err) {
|
|
socket.removeListener("error", onError);
|
|
socket.removeListener("data", onData);
|
|
reject(err);
|
|
}
|
|
});
|
|
}
|
|
|
|
const INT_1 = Buffer.from([0, 0, 0, 1]);
|
|
const saltedPasswordCache = {
|
|
password: "",
|
|
iterationCount: 0,
|
|
saltBase64: "",
|
|
salted: Buffer.allocUnsafe(0),
|
|
};
|
|
|
|
function saltPassword(
|
|
password: string,
|
|
saltBase64: string,
|
|
iteractionCount: number
|
|
): Buffer {
|
|
if (
|
|
password === saltedPasswordCache.password &&
|
|
saltBase64 === saltedPasswordCache.saltBase64 &&
|
|
iteractionCount === saltedPasswordCache.iterationCount
|
|
)
|
|
return saltedPasswordCache.salted;
|
|
|
|
const hi = createHmac("sha1", password)
|
|
.update(Buffer.concat([Buffer.from(saltBase64, "base64"), INT_1]))
|
|
.digest();
|
|
let hi2: Buffer = hi;
|
|
for (let i = 1; i < iteractionCount; ++i) {
|
|
hi2 = createHmac("sha1", password).update(hi2).digest();
|
|
for (const [j, b] of hi2.entries()) hi[j] ^= b;
|
|
}
|
|
|
|
saltedPasswordCache.saltBase64 = saltBase64;
|
|
saltedPasswordCache.password = password;
|
|
saltedPasswordCache.iterationCount = iteractionCount;
|
|
saltedPasswordCache.salted = hi;
|
|
|
|
return hi;
|
|
}
|
|
|
|
function* loginPlain(
|
|
socket: net.Socket,
|
|
username: string,
|
|
password: string
|
|
): Generator<void, void, Element> {
|
|
socket.write(
|
|
`<auth xmlns="urn:ietf:params:xml:ns:xmpp-sasl" mechanism="PLAIN">${encodeBase64(
|
|
`\x00${username}\x00${password}`
|
|
)}</auth>`
|
|
);
|
|
const res1 = yield;
|
|
|
|
if (
|
|
res1.name === "failure" &&
|
|
res1.children.some((c) => c.name === "not-authorized")
|
|
)
|
|
throw new Error("Not authorized");
|
|
|
|
if (res1.name !== "success")
|
|
throw new Error(`Unexpected response ${res1.name}`);
|
|
}
|
|
|
|
function* loginScram(
|
|
socket: net.Socket,
|
|
username: string,
|
|
password: string
|
|
): Generator<void, void, Element> {
|
|
const cnonce = randomBytes(8).toString("base64");
|
|
const gs2Header = "n,,";
|
|
const clientFirstMessageBare = `n=${username},r=${cnonce}`;
|
|
const clientFirstMessage = gs2Header + clientFirstMessageBare;
|
|
socket.write(
|
|
`<auth xmlns="urn:ietf:params:xml:ns:xmpp-sasl" mechanism="SCRAM-SHA-1">${encodeBase64(
|
|
clientFirstMessage
|
|
)}</auth>`
|
|
);
|
|
const res1 = yield;
|
|
if (res1.name !== "challenge")
|
|
throw new Error(`Unexpected element ${res1.name}`);
|
|
const serverFirstMessage = decodeBase64(res1.text);
|
|
|
|
let iterationCount: number;
|
|
let saltBase64: string;
|
|
let nonce: string;
|
|
for (const s of serverFirstMessage.split(",")) {
|
|
if (s.startsWith("i=")) iterationCount = parseInt(s.slice(2));
|
|
else if (s.startsWith("s=")) saltBase64 = s.slice(2);
|
|
else if (s.startsWith("r=")) nonce = s.slice(2);
|
|
}
|
|
if (iterationCount == null || isNaN(iterationCount))
|
|
throw new Error("Invalid iteration count");
|
|
if (saltBase64 == null) throw new Error("Missing salt");
|
|
if (nonce == null) throw new Error("Missing nonce");
|
|
|
|
const saltedPassword = saltPassword(password, saltBase64, iterationCount);
|
|
const clientKey = createHmac("sha1", saltedPassword)
|
|
.update("Client Key")
|
|
.digest();
|
|
const storedKey = createHash("sha1").update(clientKey).digest();
|
|
|
|
const clientFinalMessageWithoutProof = `c=${encodeBase64(
|
|
gs2Header
|
|
)},r=${nonce}`;
|
|
const authMessage = `${clientFirstMessageBare},${serverFirstMessage},${clientFinalMessageWithoutProof}`;
|
|
const clientSignature = createHmac("sha1", storedKey)
|
|
.update(authMessage)
|
|
.digest();
|
|
|
|
const clientProof = Buffer.from(clientKey);
|
|
for (const [i, b] of clientSignature.entries()) clientProof[i] ^= b;
|
|
|
|
const clientFinalMessage = `${clientFinalMessageWithoutProof},p=${clientProof.toString(
|
|
"base64"
|
|
)}`;
|
|
socket.write(
|
|
`<response xmlns="urn:ietf:params:xml:ns:xmpp-sasl">${encodeBase64(
|
|
clientFinalMessage
|
|
)}</response>`
|
|
);
|
|
const res2 = yield;
|
|
|
|
if (
|
|
res2.name === "failure" &&
|
|
res2.children.some((c) => c.name === "not-authorized")
|
|
)
|
|
throw new Error("Not authorized");
|
|
|
|
if (res2.name !== "success")
|
|
throw new Error(`Unexpected response ${res2.name}`);
|
|
|
|
const serverKey = createHmac("sha1", saltedPassword)
|
|
.update("Server Key")
|
|
.digest();
|
|
const serverSignature = createHmac("sha1", serverKey)
|
|
.update(authMessage)
|
|
.digest("base64");
|
|
|
|
if (!decodeBase64(res2.text).endsWith(serverSignature))
|
|
throw new Error("Invalid server signature");
|
|
}
|
|
|
|
function* starttls(socket: net.Socket): Generator<void, void, Element> {
|
|
socket.write("<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>");
|
|
const res1 = yield;
|
|
if (res1.name !== "proceed") throw new Error("Failed to initiate STARTTLS");
|
|
}
|
|
|
|
function* bind(
|
|
socket: net.Socket,
|
|
resource: string
|
|
): Generator<void, void, Element> {
|
|
const id = randomBytes(8).toString("base64");
|
|
socket.write(
|
|
`<iq id='${id}' type='set'><bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'><resource>${resource}</resource></bind></iq>`
|
|
);
|
|
const res1 = yield;
|
|
if (res1.name !== "iq") throw new Error(`Unexpected element ${res1.name}`);
|
|
const attrs1 = parseAttrs(res1.attrs);
|
|
const idAttr = attrs1.find((a) => a.name === "id");
|
|
if (!idAttr || idAttr.value !== id) throw new Error("Invalid ID");
|
|
const typeAttr = attrs1.find((a) => a.name === "type");
|
|
if (!typeAttr) throw new Error("Missing type attribute");
|
|
if (typeAttr.value !== "result") throw new Error("Cannot bind to resource");
|
|
}
|
|
|
|
const STATUS_RESTART_STREAM = 1;
|
|
const STATUS_STARTTLS = 2;
|
|
|
|
function* init(
|
|
socket: net.Socket,
|
|
host: string,
|
|
username: string,
|
|
password: string,
|
|
resource: string
|
|
): Generator<void, number, Element> {
|
|
socket.write(
|
|
`<?xml version='1.0'?><stream:stream from='${username}@${host}' to='${host}' version='1.0' xml:lang='en' xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams'>`
|
|
);
|
|
const open = yield;
|
|
if (open.name !== "stream:stream")
|
|
throw new Error(`Unexpected element ${open.name}`);
|
|
const features = yield;
|
|
if (features.name !== "stream:features")
|
|
throw new Error(`Unexpected element ${features.name}`);
|
|
for (const feature of features.children) {
|
|
if (feature.name === "starttls") {
|
|
if (feature.children.some((c) => c.name === "required")) {
|
|
yield* starttls(socket);
|
|
return STATUS_STARTTLS;
|
|
}
|
|
} else if (feature.name === "mechanisms") {
|
|
const mechanisms: Set<string> = new Set(
|
|
feature.children.map((c) => c.text)
|
|
);
|
|
if (mechanisms.has("PLAIN")) {
|
|
yield* loginPlain(socket, username, password);
|
|
return STATUS_RESTART_STREAM;
|
|
} else if (mechanisms.has("SCRAM-SHA-1")) {
|
|
yield* loginScram(socket, username, password);
|
|
return STATUS_RESTART_STREAM;
|
|
} else {
|
|
throw new Error("No supported SASL method");
|
|
}
|
|
} else if (feature.name === "bind") {
|
|
yield* bind(socket, resource);
|
|
return 0;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
function upgradeTls(socket: net.Socket, host: string): Promise<tls.TLSSocket> {
|
|
return new Promise((resolve, reject) => {
|
|
socket.on("error", reject);
|
|
const newSocket = tls.connect({ socket, host }, () => {
|
|
socket.removeListener("error", reject);
|
|
resolve(newSocket);
|
|
});
|
|
});
|
|
}
|
|
|
|
interface XmppClientOptions {
|
|
host: string;
|
|
port?: number;
|
|
username?: string;
|
|
password?: string;
|
|
resource?: string;
|
|
timeout?: number;
|
|
}
|
|
|
|
export default class XmppClient extends EventEmitter {
|
|
private _socket: net.Socket;
|
|
private _host: string;
|
|
private _username: string;
|
|
private _resource: string;
|
|
private _iqStanzaCallbacks: Map<
|
|
string,
|
|
(err: Error, r?: { rawRes: string; res: Element }) => void
|
|
>;
|
|
|
|
private constructor() {
|
|
super();
|
|
this._socket = null;
|
|
this._host = null;
|
|
this._username = null;
|
|
this._resource = null;
|
|
this._iqStanzaCallbacks = new Map();
|
|
}
|
|
|
|
static connect(opts: XmppClientOptions): Promise<XmppClient> {
|
|
return new Promise((resolve, reject) => {
|
|
let socket = new net.Socket();
|
|
socket.on("error", reject);
|
|
|
|
socket.connect(opts.port || 5222, opts.host, async () => {
|
|
socket.removeListener("error", reject);
|
|
try {
|
|
let status = 1;
|
|
while (status) {
|
|
if (status === STATUS_STARTTLS)
|
|
socket = await upgradeTls(socket, opts.host);
|
|
status = await xmppStream(
|
|
socket,
|
|
init(
|
|
socket,
|
|
opts.host,
|
|
opts.username,
|
|
opts.password,
|
|
opts.resource
|
|
)
|
|
);
|
|
}
|
|
|
|
const client = new XmppClient();
|
|
client._socket = socket;
|
|
client._host = opts.host;
|
|
client._username = opts.username;
|
|
client._resource = opts.resource;
|
|
socket.on("data", client._onData.bind(client));
|
|
socket.on("error", client._onError.bind(client));
|
|
if (opts.timeout)
|
|
socket.setTimeout(opts.timeout, client.close.bind(client));
|
|
resolve(client);
|
|
} catch (err) {
|
|
socket.destroy();
|
|
reject(err);
|
|
}
|
|
});
|
|
});
|
|
}
|
|
|
|
close(): void {
|
|
this._socket.end("</stream:stream>");
|
|
this._socket.removeAllListeners("data");
|
|
this._socket.removeAllListeners("error");
|
|
this.emit("close");
|
|
}
|
|
|
|
ref(): void {
|
|
this._socket.ref();
|
|
}
|
|
|
|
unref(): void {
|
|
this._socket.unref();
|
|
}
|
|
|
|
get host(): string {
|
|
return this._host;
|
|
}
|
|
|
|
get username(): string {
|
|
return this._username;
|
|
}
|
|
|
|
get resource(): string {
|
|
return this._resource;
|
|
}
|
|
|
|
private _onData(chunk: Buffer): void {
|
|
try {
|
|
let close = false;
|
|
let str = chunk.toString("utf8");
|
|
if (str.endsWith("</stream:stream>")) {
|
|
str = str.slice(0, -16);
|
|
close = true;
|
|
}
|
|
const xml = parseXml(str);
|
|
const idx = xml.children.map((c) => c.bodyIndex);
|
|
for (const [i, c] of xml.children.entries()) {
|
|
const s = str.slice(idx[i], idx[i + 1]);
|
|
if (c.name === "iq") {
|
|
const attrs = parseAttrs(c.attrs);
|
|
const id = attrs.find((a) => a.name === "id");
|
|
if (id) {
|
|
const cb = this._iqStanzaCallbacks.get(id.value);
|
|
if (cb) cb(null, { rawRes: s, res: c });
|
|
}
|
|
}
|
|
this.emit("stanza", c, s);
|
|
}
|
|
if (close) {
|
|
this._socket.removeAllListeners("data");
|
|
this._socket.removeAllListeners("error");
|
|
this.emit("close");
|
|
}
|
|
} catch (err) {
|
|
this._socket.removeAllListeners("data");
|
|
this._socket.removeAllListeners("error");
|
|
this.emit("error", err);
|
|
}
|
|
}
|
|
|
|
private _onError(err: Error): void {
|
|
this._socket.end();
|
|
this.emit("error", err);
|
|
for (const cb of this._iqStanzaCallbacks.values()) cb(err);
|
|
}
|
|
|
|
send(msg: string): void {
|
|
this._socket.write(msg);
|
|
}
|
|
|
|
sendIqStanza(
|
|
from: string,
|
|
to: string,
|
|
type: string,
|
|
body: string,
|
|
timeout = 3000
|
|
): Promise<{ rawReq: string; rawRes: string; res: Element }> {
|
|
return new Promise((resolve, reject) => {
|
|
const id = randomBytes(8).toString("base64");
|
|
const rawReq = `<iq from="${from}" to="${to}" id="${id}" type="${type}">${body}</iq>`;
|
|
this.send(rawReq);
|
|
const t = setTimeout(() => {
|
|
this._iqStanzaCallbacks.delete(id);
|
|
reject(
|
|
new Error("Did not receive IQ stanza response in a timely manner")
|
|
);
|
|
}, timeout);
|
|
this._iqStanzaCallbacks.set(id, (err, r) => {
|
|
this._iqStanzaCallbacks.delete(id);
|
|
clearTimeout(t);
|
|
if (err) reject(err);
|
|
else resolve(Object.assign(r, { rawReq }));
|
|
});
|
|
});
|
|
}
|
|
}
|