pysamlsp

pysamlsp is a Python library for implementing a Service Provider within a SAML2.0 SSO environment.

This package is under active development but is currently incomplete. Please don't try to use it.

Requirements

Python packages

• python-setuptools
• python 2.7
• lxml

and for tests:

• nose
• expecter
• dingus

Non-Python packages

• xmlsec1
• openssl (though xmlsec1 may be built with GnuTLS, Libgcrypt, or NSS)
• libxml2
• libxslt

Installation

Just run:

pip install pysamlsp

Usage

Initialize the class with a configuration dictionary:

sp_config = dict( ... )

The configuration dictionary may have the following entries:

• 'assertion_consumer_service_url': The URL of the SSO provider.
• 'issuer': A unique identifier for the service provider; probably should match the entityID attribute of the SP metadata.
• 'private_key': A path for the private key PEM file, required for signing AuthnRequests.
• 'sign_authnrequests': True / False flag to indicate whether AuthnRequests should be signed.
• 'certificate': A path for the certificate file against which a SAMLResponse signature can be verified.

Create a redirect URL with the SAMLRequest query parameter:

sp = Pysamlsp(sp_config)
redirect_url = sp.redirect_for_idp()

The identity provider will post to the address specified in the service providers metadata.xml. The posted field "SAMLResponse" will contain a (base64encoded, gzip'd) XML response:

saml_response = query['SAMLResponse']
if sp.idp_response_is_valid(saml_response):
  ...

Signed AuthnRequests

If you are signing your AuthnRequests, you'll need an RSA private key. Here is a procedure for creating the keys using openssl.

Create a private key, good for 10 years:

openssl req -x509 -days 3650 -newkey rsa:1024 -keyout saml_key_pw.pem -out saml.crt

Remove the passphrase from your new key. This library does not currently support keys with passphrases:

openssl rsa -in saml_key_pw.pem -out saml_key.pem

Create a public key from the private key. You'll need this for metadata:

openssl rsa -in saml_key.pem -pubout > saml.pub