SELECT * 
FROM   sys.server_principals;

SELECT * 
FROM   sys.server_role_members;

SELECT usr.name AS UTILISATEUR, 'MEMBRE DU ROLE', rol.name AS ROLE
FROM   sys.server_role_members AS srm
       JOIN sys.server_principals AS usr
          ON srm.member_principal_id = usr.principal_id
       JOIN sys.server_principals AS rol
          ON srm.role_principal_id = rol.principal_id;

SELECT p.*, ep.name
FROM   sys.server_permissions AS p
       LEFT OUTER JOIN sys.endpoints AS ep 
            ON p.major_id = ep.endpoint_id AND p.class_desc = 'ENDPOINT'