Mon 21 Jul 22:43:21 CEST 2025

This commit is contained in:
sbosse 2025-07-21 22:59:59 +02:00
parent 93e74774fd
commit 4985346221

110
js/x11/core/auth.js Normal file
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// TODO: differentiate between auth types (i.e., MIT-MAGIC-COOKIE-1 and XDM-AUTHORIZATION-1)
// and choose the best based on the algorithm in libXau's XauGetBestAuthByAddr
var fs = Require('fs');
var Buffer = Require('buffer').Buffer;
// add 'unpack' method for buffer
Require('x11/core/unpackbuffer').addUnpack(Buffer);
var typeToName = {
256: 'Local',
65535: 'Wild',
254: 'Netname',
253: 'Krb5Principal',
252: 'LocalHost',
0: 'Internet',
1: 'DECnet',
2: 'Chaos',
5: 'ServerInterpreted',
6: 'Internet6'
};
function parseXauth( buf )
{
var offset = 0;
var auth = [];
var cookieProperties = ['address', 'display', 'authName', 'authData'];
while (offset < buf.length)
{
var cookie = {};
cookie.type = buf.readUInt16BE(offset);
if (!typeToName[cookie.type]) {
console.warn('Unknown address type');
}
offset += 2;
cookieProperties.forEach(function(property) {
var length = buf.unpack('n', offset)[0];
offset += 2;
if (cookie.type === 0 && property == 'address') { // Internet
// 4 bytes of ip addess, convert to w.x.y.z string
cookie.address = [ buf[offset], buf[offset+1], buf[offset+2], buf[offset+3]]
.map(function(octet) { return octet.toString(10) }).join('.');
} else {
cookie[property] = buf.unpackString(length, offset);
}
offset += length;
});
auth.push(cookie);
}
return auth;
}
var homedir = Require('os/os-homedir');
var path = Require('path');
function readXauthority(cb) {
var filename = process.env.XAUTHORITY || path.join(homedir(), '.Xauthority');
fs.readFile(filename, function(err, data) {
if (!err)
return cb(null, data);
if(err.code == 'ENOENT') {
// Xming/windows uses %HOME%/Xauthority ( .Xauthority with no dot ) - try with this name
filename = process.env.XAUTHORITY || path.join(homedir(), 'Xauthority');
fs.readFile(filename, function (err, data) {
if (err.code == 'ENOENT') {
cb(null, null);
} else {
cb(err);
}
});
} else {
cb(err);
}
});
}
module.exports = function( display, host, socketFamily, cb )
{
var family;
if (socketFamily === 'IPv4') {
family = 0; // Internet
} else if (socketFamily === 'IPv6') {
family = 6; // Internet6
} else {
family = 256; // Local
}
readXauthority(function(err, data) {
if(err) return cb(err);
if (!data) {
return cb(null, {
authName: '',
authData: ''
});
}
var auth = parseXauth(data);
for (var cookieNum in auth)
{
var cookie = auth[cookieNum];
if ((typeToName[cookie.family] === 'Wild' || (cookie.type === family && cookie.address === host)) &&
(cookie.display.length === 0 || cookie.display === display))
return cb( null, cookie );
}
// If no cookie is found, proceed without authentication
cb(null, {
authName: '',
authData: ''
});
});
};