CasperSecurity
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
exports.HttpsProxyAgent = void 0;
const net = __importStar(require("net"));
const tls = __importStar(require("tls"));
const assert_1 = __importDefault(require("assert"));
const debug_1 = __importDefault(require("debug"));
const agent_base_1 = require("agent-base");
const url_1 = require("url");
const parse_proxy_response_1 = require("./parse-proxy-response");
const debug = (0, debug_1.default)('https-proxy-agent');
/**
* The `HttpsProxyAgent` implements an HTTP Agent subclass that connects to
* the specified "HTTP(s) proxy server" in order to proxy HTTPS requests.
*
* Outgoing HTTP requests are first tunneled through the proxy server using the
* `CONNECT` HTTP request method to establish a connection to the proxy server,
* and then the proxy server connects to the destination target and issues the
* HTTP request from the proxy server.
*
* `https:` requests have their socket connection upgraded to TLS once
* the connection to the proxy server has been established.
*/
class HttpsProxyAgent extends agent_base_1.Agent {
constructor(proxy, opts) {
super(opts);
this.options = { path: undefined };
this.proxy = typeof proxy === 'string' ? new url_1.URL(proxy) : proxy;
this.proxyHeaders = opts?.headers ?? {};
debug('Creating new HttpsProxyAgent instance: %o', this.proxy.href);
// Trim off the brackets from IPv6 addresses
const host = (this.proxy.hostname || this.proxy.host).replace(/^\[|\]$/g, '');
const port = this.proxy.port
? parseInt(this.proxy.port, 10)
: this.proxy.protocol === 'https:'
? 443
: 80;
this.connectOpts = {
// Attempt to negotiate http/1.1 for proxy servers that support http/2
ALPNProtocols: ['http/1.1'],
...(opts ? omit(opts, 'headers') : null),
host,
port,
};
}
/**
* Called when the node-core HTTP client library is creating a
* new HTTP request.
*/
async connect(req, opts) {
const { proxy } = this;
if (!opts.host) {
throw new TypeError('No "host" provided');
}
// Create a socket connection to the proxy server.
let socket;
if (proxy.protocol === 'https:') {
debug('Creating `tls.Socket`: %o', this.connectOpts);
const servername = this.connectOpts.servername || this.connectOpts.host;
socket = tls.connect({
...this.connectOpts,
servername: servername && net.isIP(servername) ? undefined : servername,
});
}
else {
debug('Creating `net.Socket`: %o', this.connectOpts);
socket = net.connect(this.connectOpts);
}
const headers = typeof this.proxyHeaders === 'function'
? this.proxyHeaders()
: { ...this.proxyHeaders };
const host = net.isIPv6(opts.host) ? `[${opts.host}]` : opts.host;
let payload = `CONNECT ${host}:${opts.port} HTTP/1.1\r\n`;
// Inject the `Proxy-Authorization` header if necessary.
if (proxy.username || proxy.password) {
const auth = `${decodeURIComponent(proxy.username)}:${decodeURIComponent(proxy.password)}`;
headers['Proxy-Authorization'] = `Basic ${Buffer.from(auth).toString('base64')}`;
}
headers.Host = `${host}:${opts.port}`;
if (!headers['Proxy-Connection']) {
headers['Proxy-Connection'] = this.keepAlive
? 'Keep-Alive'
: 'close';
}
for (const name of Object.keys(headers)) {
payload += `${name}: ${headers[name]}\r\n`;
}
const proxyResponsePromise = (0, parse_proxy_response_1.parseProxyResponse)(socket);
socket.write(`${payload}\r\n`);
const { connect, buffered } = await proxyResponsePromise;
req.emit('proxyConnect', connect);
this.emit('proxyConnect', connect, req);
if (connect.statusCode === 200) {
req.once('socket', resume);
if (opts.secureEndpoint) {
// The proxy is connecting to a TLS server, so upgrade
// this socket connection to a TLS connection.
debug('Upgrading socket connection to TLS');
const servername = opts.servername || opts.host;
return tls.connect({
...omit(opts, 'host', 'path', 'port'),
socket,
servername: net.isIP(servername) ? undefined : servername,
});
}
return socket;
}
// Some other status code that's not 200... need to re-play the HTTP
// header "data" events onto the socket once the HTTP machinery is
// attached so that the node core `http` can parse and handle the
// error status code.
// Close the original socket, and a new "fake" socket is returned
// instead, so that the proxy doesn't get the HTTP request
// written to it (which may contain `Authorization` headers or other
// sensitive data).
//
// See: https://hackerone.com/reports/541502
socket.destroy();
const fakeSocket = new net.Socket({ writable: false });
fakeSocket.readable = true;
// Need to wait for the "socket" event to re-play the "data" events.
req.once('socket', (s) => {
debug('Replaying proxy buffer for failed request');
(0, assert_1.default)(s.listenerCount('data') > 0);
// Replay the "buffered" Buffer onto the fake `socket`, since at
// this point the HTTP module machinery has been hooked up for
// the user.
s.push(buffered);
s.push(null);
});
return fakeSocket;
}
}
HttpsProxyAgent.protocols = ['http', 'https'];
exports.HttpsProxyAgent = HttpsProxyAgent;
function resume(socket) {
socket.resume();
}
function omit(obj, ...keys) {
const ret = {};
let key;
for (key in obj) {
if (!keys.includes(key)) {
ret[key] = obj[key];
}
}
return ret;
}
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