Checkmk Werk 15671: SAML: use RSA-SHA256 to sign authentication requests

ID: 15671 Title: SAML: use RSA-SHA256 to sign authentication requests Component: setup Level: 1 Class: New feature Version: 2.3.0b1 Checkmk would sign its authentication requests with RSA-SHA512. However, some identity providers (e.g. some versions of Microsoft ADFS) do not support any signature algorithms beyond SHA256. As a result, the authentication requests would be rejected with an error message similar to "Error details: MSIS7093: The message is not signed with expected signature algorithm. Message is signed with signature algorithm http://www.w3.org/2001/04/xmldsig-more#rsa-sha512. Expected signature algorithm http://www.w3.org/2001/04/xmldsig-more#rsa-sha256." For this reason, Checkmk now uses RSA-SHA256 to sign its authentication requests.