pyramid-multiauth 0.3.0

pyramid_multiauth

An authentication policy for Pyramid that proxies to a stack of other authentication policies.

Overview

MultiAuthenticationPolicy is a Pyramid authentication policy that proxies to a stack of other IAuthenticationPolicy objects, to provide a combined auth solution from individual pieces. Simply pass it a list of policies that should be tried in order:

policies = [
    IPAuthenticationPolicy("127.0.*.*", principals=["local"])
    IPAuthenticationPolicy("192.168.*.*", principals=["trusted"])
]
authn_policy = MultiAuthenticationPolicy(policies)
config.set_authentication_policy(authn_policy)

This example uses the pyramid_ipauth module to assign effective principals based on originating IP address of the request. It combines two such policies so that requests originating from “127.0.*.*” will have principal “local” while requests originating from “192.168.*.*” will have principal “trusted”.

In general, the results from the stacked authentication policies are combined as follows:

• authenticated_userid: return userid from first successful policy

• unauthenticated_userid: return userid from first successful policy

• effective_principals: return union of principals from all policies

• remember: return headers from all policies

• forget: return headers from all policies

Deployment Settings

It is also possible to specify the authentication policies as part of your paste deployment settings. Consider the following example:

[app:pyramidapp]
use = egg:mypyramidapp

multiauth.policies = ipauth1 ipauth2 pyramid_browserid

multiauth.policy.ipauth1.use = pyramid_ipauth.IPAuthentictionPolicy
multiauth.policy.ipauth1.ipaddrs = 127.0.*.*
multiauth.policy.ipauth1.principals = local

multiauth.policy.ipauth2.use = pyramid_ipauth.IPAuthentictionPolicy
multiauth.policy.ipauth2.ipaddrs = 192.168.*.*
multiauth.policy.ipauth2.principals = trusted

To configure authentication from these settings, simply include the multiauth module into your configurator:

config.include("pyramid_multiauth")

In this example you would get a MultiAuthenticationPolicy with three stacked auth policies. The first two, ipauth1 and ipauth2, are defined as the name of of a callable along with a set of keyword arguments. The third is defined as the name of a module, pyramid_browserid, which will be procecesed via the standard config.include() mechanism.

The end result would be a system that authenticates users via BrowserID, and assigns additional principal identifiers based on the originating IP address of the request.

0.3.0 - 2012-11-27

• Support for Python3 via source-level compatibility.

• Fire a MultiAuthPolicySelected event when a policy is successfully used for authentication.

0.2.0 - 2012-10-04

• Add get_policy() method, which can be used to look up the loaded sub-policies at runtime.

0.1.2 - 2012-01-30

• Update license to MPL 2.0.

0.1.1 - 2011-12-20

• Compatability with Pyramid 1.3.

0.1.0 - 2011-11-11

• Initial release.