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step towards customizable login functionality

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This commit is contained in:
ansuz
2018-01-10 10:14:49 +01:00
parent a91124e21c
commit 65a1decd73
5 changed files with 4 additions and 101 deletions
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77
www/common/credential.js
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define([
'/customize/application_config.js',
'/bower_components/scrypt-async/scrypt-async.min.js',
], function (AppConfig) {
var Cred = {};
var Scrypt = window.scrypt;
Cred.MINIMUM_PASSWORD_LENGTH = typeof(AppConfig.minimumPasswordLength) === 'number'?
AppConfig.minimumPasswordLength: 8;
Cred.isLongEnoughPassword = function (passwd) {
return passwd.length >= Cred.MINIMUM_PASSWORD_LENGTH;
};
var isString = Cred.isString = function (x) {
return typeof(x) === 'string';
};
Cred.isValidUsername = function (name) {
return !!(name && isString(name));
};
Cred.isValidPassword = function (passwd) {
return !!(passwd && isString(passwd));
};
Cred.passwordsMatch = function (a, b) {
return isString(a) && isString(b) && a === b;
};
Cred.customSalt = function () {
return typeof(AppConfig.loginSalt) === 'string'?
AppConfig.loginSalt: '';
};
Cred.deriveFromPassphrase = function (username, password, len, cb) {
Scrypt(password,
username + Cred.customSalt(), // salt
8, // memoryCost (n)
1024, // block size parameter (r)
len || 128, // dkLen
200, // interruptStep
cb,
undefined); // format, could be 'base64'
};
Cred.dispenser = function (bytes) {
var entropy = {
used: 0,
};
// crypto hygeine
var consume = function (n) {
// explode if you run out of bytes
if (entropy.used + n > bytes.length) {
throw new Error('exceeded available entropy');
}
if (typeof(n) !== 'number') { throw new Error('expected a number'); }
if (n <= 0) {
throw new Error('expected to consume a positive number of bytes');
}
// grab an unused slice of the entropy
var A = bytes.slice(entropy.used, entropy.used + n);
// account for the bytes you used so you don't reuse bytes
entropy.used += n;
//console.info("%s bytes of entropy remaining", bytes.length - entropy.used);
return A;
};
return consume;
};
return Cred;
});

146
www/common/login.js
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define([
'jquery',
'/bower_components/chainpad-listmap/chainpad-listmap.js',
'/bower_components/chainpad-crypto/crypto.js',
'/common/common-util.js',
'/common/outer/network-config.js',
'/common/credential.js',
'/bower_components/chainpad/chainpad.dist.js',
'/bower_components/tweetnacl/nacl-fast.min.js',
'/bower_components/scrypt-async/scrypt-async.min.js', // better load speed
], function ($, Listmap, Crypto, Util, NetConfig, Cred, ChainPad) {
var Exports = {
Cred: Cred,
};
var Nacl = window.nacl;
var allocateBytes = function (bytes) {
var dispense = Cred.dispenser(bytes);
var opt = {};
// dispense 18 bytes of entropy for your encryption key
var encryptionSeed = dispense(18);
// 16 bytes for a deterministic channel key
var channelSeed = dispense(16);
// 32 bytes for a curve key
var curveSeed = dispense(32);
var curvePair = Nacl.box.keyPair.fromSecretKey(new Uint8Array(curveSeed));
opt.curvePrivate = Nacl.util.encodeBase64(curvePair.secretKey);
opt.curvePublic = Nacl.util.encodeBase64(curvePair.publicKey);
// 32 more for a signing key
var edSeed = opt.edSeed = dispense(32);
// derive a private key from the ed seed
var signingKeypair = Nacl.sign.keyPair.fromSeed(new Uint8Array(edSeed));
opt.edPrivate = Nacl.util.encodeBase64(signingKeypair.secretKey);
opt.edPublic = Nacl.util.encodeBase64(signingKeypair.publicKey);
var keys = opt.keys = Crypto.createEditCryptor(null, encryptionSeed);
// 24 bytes of base64
keys.editKeyStr = keys.editKeyStr.replace(/\//g, '-');
// 32 bytes of hex
var channelHex = opt.channelHex = Util.uint8ArrayToHex(channelSeed);
// should never happen
if (channelHex.length !== 32) { throw new Error('invalid channel id'); }
opt.channel64 = Util.hexToBase64(channelHex);
opt.userHash = '/1/edit/' + [opt.channel64, opt.keys.editKeyStr].join('/');
return opt;
};
var loadUserObject = function (opt, cb) {
var config = {
websocketURL: NetConfig.getWebsocketURL(),
channel: opt.channelHex,
data: {},
validateKey: opt.keys.validateKey, // derived validation key
crypto: Crypto.createEncryptor(opt.keys),
logLevel: 1,
classic: true,
ChainPad: ChainPad,
};
var rt = opt.rt = Listmap.create(config);
rt.proxy
.on('ready', function () {
cb(void 0, rt);
})
.on('disconnect', function (info) {
cb('E_DISCONNECT', info);
});
};
var isProxyEmpty = function (proxy) {
return Object.keys(proxy).length === 0;
};
Exports.loginOrRegister = function (uname, passwd, isRegister, cb) {
if (typeof(cb) !== 'function') { return; }
// Usernames are all lowercase. No going back on this one
uname = uname.toLowerCase();
// validate inputs
if (!Cred.isValidUsername(uname)) { return void cb('INVAL_USER'); }
if (!Cred.isValidPassword(passwd)) { return void cb('INVAL_PASS'); }
if (isRegister && !Cred.isLongEnoughPassword(passwd)) {
return void cb('PASS_TOO_SHORT');
}
Cred.deriveFromPassphrase(uname, passwd, 128, function (bytes) {
// results...
var res = {
register: isRegister,
};
// run scrypt to derive the user's keys
var opt = res.opt = allocateBytes(bytes);
// use the derived key to generate an object
loadUserObject(opt, function (err, rt) {
if (err) { return void cb(err); }
res.proxy = rt.proxy;
res.realtime = rt.realtime;
res.network = rt.network;
// they're registering...
res.userHash = opt.userHash;
res.userName = uname;
// export their signing key
res.edPrivate = opt.edPrivate;
res.edPublic = opt.edPublic;
res.curvePrivate = opt.curvePrivate;
res.curvePublic = opt.curvePublic;
// they tried to just log in but there's no such user
if (!isRegister && isProxyEmpty(rt.proxy)) {
rt.network.disconnect(); // clean up after yourself
return void cb('NO_SUCH_USER', res);
}
// they tried to register, but those exact credentials exist
if (isRegister && !isProxyEmpty(rt.proxy)) {
rt.network.disconnect();
return void cb('ALREADY_REGISTERED', res);
}
setTimeout(function () { cb(void 0, res); });
});
});
};
return Exports;
});