I have to check client certificate issuer in the Lighttpd but can't find any variable for that.
Here is part of my config, related to ssl_mod:
$SERVER["socket"] == ":443" {
ssl.engine = "enable"
ssl.pemfile = "/etc/certs/this-server.pem"
ssl.ca-file = "/etc/certs/allcas.pem"
ssl.verifyclient.activate = "enable"
ssl.verifyclient.username = "enable"
}