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Workarounds related to Zope's security subsystem.

Project description

This package allows to work around weaknesses in the web application server Zope’s security subsystem. Currently, it contains a single module proxy.


In principle, Zope makes a clear distinction between trusted code (which comes from the file system and cannot be modified through-the-web) and untrusted code (which might be tangled with through-the-web). Trusted code is unrestricted by Zope’s security subsystem, untrusted code has permission checks on each object and method access.

Unfortunately, occasionnally, trusted code performs its own security checks – and can raise Unauthorized exceptions even when called from other trusted code. The proxy module is destined to work around this behaviour. It uses Zope’s so called proxy roles to set up roles which should be used for internal security checks.

The module defines two methods setup_proxy_roles(roles) and cleanup_proxy_roles(context). They are used in the following idiom:

>>> context = setup_proxy_roles((role1, role2, ...))
>>> try:
>>>   ... perform any operation with internal security checks ...
>>> finally:
>>>   cleanup_proxy_roles(context)

This sets up proxy roles (role1, role2, …) to be used for the following internal security checks until the following cleanup_proxy_roles.

Usually, the roles are ('Manager', 'Authenticated') but can be anything. Note that proxy roles override any currently active user roles.

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