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A service provider implementation for SAML2.0.

Project description

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.


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


At this point in development, I have not uploaded to Pypi. Once I have, installation will be as easy as:

pip install pysqlsp

In the meantime you can clone this repository and run:

python install


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 >

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