OmniAuth SAML

A generic SAML strategy for OmniAuth.

https://github.com/PracticallyGreen/omniauth-saml

Requirements

OmniAuth 1.2+
Ruby 1.9.x or Ruby 2.1.x

Usage

Use the SAML strategy as a middleware in your application:

require 'omniauth'
use OmniAuth::Strategies::SAML,
  :assertion_consumer_service_url     => "consumer_service_url",
  :issuer                             => "issuer",
  :idp_sso_target_url                 => "idp_sso_target_url",
  :idp_sso_target_url_runtime_params  => {:original_request_param => :mapped_idp_param},
  :idp_cert                           => "-----BEGIN CERTIFICATE-----\n...-----END CERTIFICATE-----",
  :idp_cert_fingerprint               => "E7:91:B2:E1:...",
  :idp_cert_fingerprint_validator     => lambda { |fingerprint| fingerprint },
  :name_identifier_format             => "urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"

or in your Rails application:

in Gemfile:

gem 'omniauth-saml'

and in config/initializers/omniauth.rb:

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :saml,
    :assertion_consumer_service_url     => "consumer_service_url",
    :issuer                             => "rails-application",
    :idp_sso_target_url                 => "idp_sso_target_url",
    :idp_sso_target_url_runtime_params  => {:original_request_param => :mapped_idp_param},
    :idp_cert                           => "-----BEGIN CERTIFICATE-----\n...-----END CERTIFICATE-----",
    :idp_cert_fingerprint               => "E7:91:B2:E1:...",
    :idp_cert_fingerprint_validator     => lambda { |fingerprint| fingerprint },
    :name_identifier_format             => "urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"
end

For IdP-initiated SSO, users should directly access the IdP SSO target URL. Set the href of your application's login link to the value of idp_sso_target_url. For SP-initiated SSO, link to /auth/saml.

Metadata

The service provider metadata used to ease configuration of the SAML SP in the IdP can be retrieved from http://example.com/auth/saml/metadata. Send this URL to the administrator of the IdP.

Options

:assertion_consumer_service_url - The URL at which the SAML assertion should be received. If not provided, defaults to the OmniAuth callback URL (typically http://example.com/auth/saml/callback). Optional.
:issuer - The name of your application. Some identity providers might need this to establish the identity of the service provider requesting the login. Required.
:idp_sso_target_url - The URL to which the authentication request should be sent. This would be on the identity provider. Required.
:idp_sso_target_url_runtime_params - A dynamic mapping of request params that exist during the request phase of OmniAuth that should to be sent to the IdP after a specific mapping. So for example, a param original_request_param with value original_param_value, could be sent to the IdP on the login request as mapped_idp_param with value original_param_value. Optional.
:idp_cert - The identity provider's certificate in PEM format. Takes precedence over the fingerprint option below. This option or :idp_cert_fingerprint or :idp_cert_fingerprint_validator must be present.
:idp_cert_fingerprint - The SHA1 fingerprint of the certificate, e.g. "90:CC:16:F0:8D:...". This is provided from the identity provider when setting up the relationship. This option or :idp_cert or :idp_cert_fingerprint_validator MUST be present.
:idp_cert_fingerprint_validator - A lambda that MUST accept one parameter (the fingerprint), verify if it is valid and return it if successful. This option or :idp_cert or :idp_cert_fingerprint MUST be present.
:name_identifier_format - Used during SP-initiated SSO. Describes the format of the username required by this application. If you need the email address, use "urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress". See http://docs.oasis-open.org/security/saml/v2.0/saml-core-2.0-os.pdf section 8.3 for other options. Note that the identity provider might not support all options. If not specified, the IdP is free to choose the name identifier format used in the response. Optional.
See the OneLogin::RubySaml::Settings class in the Ruby SAML gem for additional supported options.

Authors

Authored by Rajiv Aaron Manglani, Raecoo Cao, Todd W Saxton, Ryan Wilcox, Steven Anderson, Nikos Dimitrakopoulos, Rudolf Vriend and Bruno Pedro.

License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.