Werk #15448: SAML: response signature is optional

Checkmk required both the response and the assertion statement to be signed in order to accept an authentication request response from the identity provider. However, as per the SAML specifications, only the assertion statement signature is required and the response signature is optional. For this reason, authentication request responses that only have the assertion statement signed are now accepted.

See section 4.1.3.5 in: http://docs.oasis-open.org/security/saml/v2.0/saml-profiles-2.0-os.pdf

To the list of all Werks