416 lines
9.4 KiB
JavaScript
416 lines
9.4 KiB
JavaScript
/* jslint node: true */
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'use strict';
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var userDb = require('./database.js').dbs.user;
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var Config = require('./config.js').config;
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var userGroup = require('./user_group.js');
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var crypto = require('crypto');
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var assert = require('assert');
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var async = require('async');
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var _ = require('lodash');
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exports.User = User;
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exports.getUserIdAndName = getUserIdAndName;
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function User() {
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var self = this;
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this.userId = 0;
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this.username = '';
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this.properties = {}; // name:value
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this.groups = {}; // id:name
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this.isValid = function() {
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if(self.userId <= 0 || self.username.length < Config.users.usernameMin) {
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return false;
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}
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return this.hasValidPassword();
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};
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this.hasValidPassword = function() {
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if(!this.properties || !this.properties.pw_pbkdf2_salt || !this.properties.pw_pbkdf2_dk) {
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return false;
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}
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return this.properties.pw_pbkdf2_salt.length === User.PBKDF2.saltLen * 2 &&
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this.prop_name.pw_pbkdf2_dk.length === User.PBKDF2.keyLen * 2;
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};
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this.isRoot = function() {
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return 1 === this.userId;
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};
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this.isSysOp = this.isRoot; // alias
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this.isGroupMember = function(groupIdOrName) {
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return _.isString(self.groups[groupIdOrName]);
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};
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}
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User.PBKDF2 = {
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iterations : 1000,
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keyLen : 128,
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saltLen : 32,
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};
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User.StandardPropertyGroups = {
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password : [ 'pw_pbkdf2_salt', 'pw_pbkdf2_dk' ],
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};
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User.AccountStatus = {
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disabled : -1,
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inactive : 0,
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active : 1,
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};
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User.prototype.authenticate = function(username, password, cb) {
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var self = this;
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var cachedInfo = {};
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async.waterfall(
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[
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function fetchUserId(callback) {
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// get user ID
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getUserIdAndName(username, function onUserId(err, uid, un) {
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cachedInfo.userId = uid;
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cachedInfo.username = un;
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callback(err);
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});
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},
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function getRequiredAuthProperties(callback) {
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// fetch properties required for authentication
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loadProperties( { userId : cachedInfo.userId, names : User.StandardPropertyGroups.password }, function onProps(err, props) {
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callback(err, props);
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});
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},
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function getDkWithSalt(props, callback) {
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// get DK from stored salt and password provided
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generatePasswordDerivedKey(password, props.pw_pbkdf2_salt, function onDk(err, dk) {
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callback(err, dk, props.pw_pbkdf2_dk);
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});
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},
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function validateAuth(passDk, propsDk, callback) {
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//
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// Use constant time comparison here for security feel-goods
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//
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var passDkBuf = new Buffer(passDk, 'hex');
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var propsDkBuf = new Buffer(propsDk, 'hex');
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if(passDkBuf.length !== propsDkBuf.length) {
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callback(new Error('Invalid password'));
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return;
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}
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var c = 0;
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for(var i = 0; i < passDkBuf.length; i++) {
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c |= passDkBuf[i] ^ propsDkBuf[i];
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}
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callback(0 === c ? null : new Error('Invalid password'));
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},
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function initProps(callback) {
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loadProperties( { userId : cachedInfo.userId }, function onProps(err, allProps) {
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if(!err) {
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cachedInfo.properties = allProps;
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}
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callback(err);
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});
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},
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function initGroups(callback) {
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userGroup.getGroupsForUser(cachedInfo.userId, function groupsLoaded(err, groups) {
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if(!err) {
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cachedInfo.groups = groups;
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}
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callback(err);
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});
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}
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],
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function complete(err) {
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if(!err) {
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self.userId = cachedInfo.userId;
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self.username = cachedInfo.username;
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self.properties = cachedInfo.properties;
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self.groups = cachedInfo.groups;
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self.authenticated = true;
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}
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cb(err);
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}
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);
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};
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User.prototype.create = function(options, cb) {
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assert(0 === this.userId);
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assert(this.username.length > 0); // :TODO: Min username length? Max?
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assert(_.isObject(options));
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assert(_.isString(options.password));
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var self = this;
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// :TODO: set various defaults, e.g. default activation status, etc.
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self.properties.account_status = Config.users.requireActivation ? User.AccountStatus.inactive : User.AccountStatus.active;
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async.series(
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[
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function beginTransaction(callback) {
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userDb.run('BEGIN;', function transBegin(err) {
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callback(err);
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});
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},
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function createUserRec(callback) {
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userDb.run(
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'INSERT INTO user (user_name) ' +
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'VALUES (?);',
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[ self.username ],
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function userInsert(err) {
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if(err) {
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callback(err);
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} else {
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self.userId = this.lastID;
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// Do not require activation for userId 1 (root/admin)
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if(1 === self.userId) {
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self.properties.account_status = User.AccountStatus.active;
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}
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callback(null);
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}
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}
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);
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},
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function genAuthCredentials(callback) {
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generatePasswordDerivedKeyAndSalt(options.password, function dkAndSalt(err, info) {
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if(err) {
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callback(err);
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} else {
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self.properties.pw_pbkdf2_salt = info.salt;
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self.properties.pw_pbkdf2_dk = info.dk;
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callback(null);
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}
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});
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},
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function setInitialGroupMembership(callback) {
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userGroup.getGroupsByName(Config.users.defaultGroups, function defaultGroups(err, groups) {
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if(err) {
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callback(err);
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} else {
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self.groups = groups;
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callback(null);
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}
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});
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},
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function setInitialSysOpGroupMembership(callback) {
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if(1 !== self.userId) {
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callback(null);
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return;
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}
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userGroup.getGroupsByName( [ 'sysops' ], function sysopGroups(err, groups) {
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if(err) {
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callback(err);
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} else {
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_.assign(self.groups, self.groups, groups);
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callback(null);
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}
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});
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},
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function saveAll(callback) {
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self.persist(false, function persisted(err) {
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callback(err);
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});
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}
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],
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function complete(err) {
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if(err) {
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var originalError = err;
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userDb.run('ROLLBACK;', function rollback(err) {
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assert(!err);
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cb(originalError);
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});
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} else {
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userDb.run('COMMIT;', function commited(err) {
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cb(err);
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});
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}
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}
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);
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};
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User.prototype.persist = function(useTransaction, cb) {
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assert(this.userId > 0);
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var self = this;
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async.series(
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[
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function beginTransaction(callback) {
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if(useTransaction) {
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userDb.run('BEGIN;', function transBegin(err) {
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callback(err);
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});
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} else {
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callback(null);
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}
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},
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function saveProps(callback) {
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self.persistProperties(function persisted(err) {
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callback(err);
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});
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},
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function saveGroups(callback) {
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userGroup.addUserToGroups(self.userId, self.groups, function groupsSaved(err) {
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callback(err);
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});
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}
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],
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function complete(err) {
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if(err) {
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if(useTransaction) {
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userDb.run('ROLLBACK;', function rollback(err) {
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cb(err);
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});
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} else {
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cb(err);
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}
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} else {
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if(useTransaction) {
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userDb.run('COMMIT;', function commited(err) {
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cb(err);
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});
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} else {
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cb(null);
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}
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}
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}
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);
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};
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User.prototype.persistProperties = function(cb) {
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assert(this.userId > 0);
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var self = this;
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var stmt = userDb.prepare(
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'REPLACE INTO user_property (user_id, prop_name, prop_value) ' +
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'VALUES (?, ?, ?);');
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async.each(Object.keys(this.properties), function property(propName, callback) {
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stmt.run(self.userId, propName, self.properties[propName], function onRun(err) {
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callback(err);
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});
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}, function complete(err) {
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if(err) {
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cb(err);
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} else {
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stmt.finalize(function finalized() {
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cb(null);
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});
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}
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});
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};
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///////////////////////////////////////////////////////////////////////////////
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// Exported methods
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///////////////////////////////////////////////////////////////////////////////
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function getUserIdAndName(username, cb) {
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userDb.get(
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'SELECT id, user_name ' +
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'FROM user ' +
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'WHERE user_name LIKE ?;',
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[ username ],
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function onResults(err, row) {
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if(err) {
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cb(err);
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} else {
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if(row) {
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cb(null, row.id, row.user_name);
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} else {
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cb(new Error('No matching username'));
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}
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}
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}
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);
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}
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///////////////////////////////////////////////////////////////////////////////
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// Internal utility methods
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///////////////////////////////////////////////////////////////////////////////
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function generatePasswordDerivedKeyAndSalt(password, cb) {
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async.waterfall(
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[
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function getSalt(callback) {
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generatePasswordDerivedKeySalt(function onSalt(err, salt) {
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callback(err, salt);
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});
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},
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function getDk(salt, callback) {
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generatePasswordDerivedKey(password, salt, function onDk(err, dk) {
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callback(err, salt, dk);
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});
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}
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],
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function onComplete(err, salt, dk) {
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cb(err, { salt : salt, dk : dk });
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}
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);
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}
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function generatePasswordDerivedKeySalt(cb) {
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crypto.randomBytes(User.PBKDF2.saltLen, function onRandSalt(err, salt) {
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if(err) {
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cb(err);
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} else {
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cb(null, salt.toString('hex'));
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}
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});
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}
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function generatePasswordDerivedKey(password, salt, cb) {
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password = new Buffer(password).toString('hex');
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crypto.pbkdf2(password, salt, User.PBKDF2.iterations, User.PBKDF2.keyLen, function onDerivedKey(err, dk) {
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if(err) {
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cb(err);
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} else {
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cb(null, dk.toString('hex'));
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}
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});
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}
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function loadProperties(options, cb) {
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assert(options.userId);
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var sql =
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'SELECT prop_name, prop_value ' +
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'FROM user_property ' +
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'WHERE user_id = ?';
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if(options.names) {
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sql +=' AND prop_name IN("' + options.names.join('","') + '");';
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} else {
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sql += ';';
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}
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var properties = {};
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userDb.each(sql, [ options.userId ], function onRow(err, row) {
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if(err) {
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cb(err);
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return;
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} else {
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properties[row.prop_name] = row.prop_value;
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}
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}, function complete() {
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cb(null, properties);
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});
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}
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