Merge pull request rapid7#19835 from cdelafuente-r7/fix/kerberos/ticket_lookup

Kerberos ticket lookup fix

Author: jheysel-r7

lib/msf/core/exploit/remote/kerberos/service_authenticator/base.rb

@@ -1088,8 +1088,8 @@ def load_credential_from_file(file_path, options = {})
       end
 
       unless !sname_hostname ||
-        sname_hostname.to_s.downcase == credential.server.components[1] ||
-        sname_hostname.to_s.downcase.ends_with?('.' + credential.server.components[1])
+          sname_hostname.to_s.downcase == credential.server.components[1].downcase ||
+          sname_hostname.to_s.downcase.ends_with?('.' + credential.server.components[1].downcase)
         wlog("Filtered credential #{file_path} ##{index} reason: SPN (#{sname_hostname}) hostname does not match (spn: #{credential.server.components.snapshot.join('/')})")
         next
       end