Use this in order to provide a ingress authentication over LDAP for Kubernetes, change the Secret inside config.sample.yaml to match your LDAP server and run:
kubectl create secret generic nginx-ldap-auth --from-file=config.yaml=config.sample.yaml
kubectl apply -f k8s.yaml
Configure your ingress with annotation nginx.ingress.kubernetes.io/auth-url: http://nginx-ldap-auth.ingress-nginx.svc.cluster.local:5555 as described on nginx documentation.
The actual version choose a random server, in future version it is intended to have a pool of them, that is why it is a list, not a single one, but you can fill only one if you wish.
The prefix tell the program which protocol to use, if ldaps:// it will try LDAP over SSL, if ldap:// it will try plain LDAP with STARTTLS, case no prefix is given it will try to guess based on port, 636 for SSL and 389 for plain.
If the user.requiredGroups list is omited or empty all LDAP users will be allowed regardless the group, if not empty all groups will be required, the next version will have more flexible configuration.
If you are not sure what filter, bindDN or baseDN to use, here is a tip:
ldapsearch -H ${servers[*]} -D ${auth.bindDN} -w ${auth.bindPW} -b ${user.baseDN|group.baseDN} ${user.filter|group.filter}
Replace the values between ${...} to the ones on config.yaml, when you succeed you can fill the final configuration.
Timeouts are configurable, but it is recommended not to use values less than some seconds, it was planned to prevent several identical requests to LDAP servers.