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warning: While this security guide tries to be quite complete, is not exhaustive. If security matters for you, you ought to check several other references.

Authentication and Authorization is a good tutorial. Among other topics, it describes basic aspects of Yii's RBAC implementation. But however hard I read the tutorial, I couldn't understand how exactly the hierarchy works. I found how to define authorization hierarchy, how business rules are evaluated, how to configure authManager, but almost nothing about how I should build my hierarchy, in what sequence its nodes are checked, when the checking process stops and what would be the checking result.

The Portable PHP password hashing framework allows advanced password hashing offering increased security over simple MD5- or SHA1-hashed passwords. phpass is already in use in some larger projects such as WordPress (since v2.5), Drupal 7 and phpBB 3.

How to create a simple (non-RBAC) authorization system

There Is Now A cpasswordhelper Class In system.utils at GitHub that provides an API to simplify the use of crypt() for password storage. While this wiki article remains valid, it will in due course be rewritten to refer to the new class as well as explain how it works.

Yii's by-default directory organization works well enough, but there are several steps one can take that improve the security and serviceability of the system, especially in the context of multiple Yii projects on the same machine (including multiple versions of the same project).

This article was rewritten as the README of the Randomness GitHub repo

Sometimes you need to force a user to change their password after x number of days. This article describes how to implement this using a filter, ChangePasswordFilter.

Starting with the blog tutorial, Yii developers are familiar with the notion of access rules defined in the controller, where the actions are allowed or denied depending on the user's name or role.

CSRF is the acronymn for Cross-site request forgery. It is an attack which forces an end user to execute unwanted actions on a web application in which he/she is currently authenticated.