Ssacl NPM | npm.io

Simple ACL for Sequelize

Effortlessly ensure that only the right actors can read and write objects.

ssacl will ensure that all reads have the appropriate where queries attached and that all writes are checked for appropriate ownership values.

ssacl needs Sequelize 2.0.7 or higher for all functionality to work

Getting Started

npm install --save ssacl

var ssacl = require('ssacl');

ssacl(sequelize|Model, {
  read: {
    attribute: 'reader'
  },
  write: {
    attribute: 'userId'
  }
});

Note: Either enable ssacl on the entire sequelize instance or specific Models. Mixing is not supported. Note: If using ssacl on specific models rather than on the sequelize instance the paranoia option needs to be the same for all models.

Usage

// will throw an error if the actor for instance does not match the passed actor
instance.update(values, {
  actor: actor
});

// will throw an error if the actor for instance does not match the passed actor
instance.destroy({
  actor: actor
});

// will ammend the where to match the actor
Model.update(values, {
  where: {..}
  actor: actor
});

// will ammend the where to match the actor
Model.destroy({
  where: {..}
  actor: actor
});

// will ammend the where to match the actor
Model.findAll({
  where: {..}
  actor: actor
});

// will ammend the where to match the actor
Model.findOne({
  where: {..}
  actor: actor
});

CLS

Passing actor to all calls can be cumbersome and error-prone so ssacl also supports passing the actor with CLS.

var cls = require('continuation-local-storage')
  , ns = cls.createNamespace('mynamespace');

ssacl(sequelize|Model, {
  cls: ns
});

// ssacl will look for the actor property in the name

ns.run(function () {
  ns.set('actor', 2);

  // both calls will automatically be scoped without explicitely setting actor
  return Model.findAll().then(function () {
    return Model.destroy();
  });
});

Note that this will apply CLS to Sequelize, so if using CLS with Sequelize, make sure it's the same namespace

Paranoia

By default ssacl will have paranoia enabled (disable with {paranoia: false} globally, or per call). With Paranoia enabled any query executed without an actor will result in an error. To perform actions as god/root use new ssacl.Omnipotent() as a placeholder actor that allows everything.

Note: null or any value matching the public value of read is also a valid read actor.

Options

ssacl

paranoia true|false Toggle paranoia mode, default: true
actor function Takes a function that parses an actor into a queryable primitive. Default function will take primary key value from a sequelize instance or return the passed input.
read object Defines the options for read restriction
read.attribute string The attribute/field to store allowed reader in
read.public Value for public read, default: null
read.none Value for no reads, default: 0
write object Defines the options for write restriction
write.attribute string The attribute/field to store allowed writeer in
write.none Value for no writes, default: 0

calls

actor null|primitive|object|instance|Omnipotent The actor for this call, default: null
paranoia true|false Toggle paranoia mode for this call default: true

Add-ons

ssacl-attributeq-roles

ssacl ships with ssacl-attribute-roles so you get role white-/blacklisting for free.

ssacl will automatically initialize the addon on the models you initialize ssacl on, so you simply have to configure your attributes as described on the add-ons github page.

koa-ssacl

koa-ssacl makes actor passing trivial by supporting cls with middleware.

ssacl v0.1.3