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stacked authentication policies for pyramid

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README.rst

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.

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