LDAP authenticator for Nginx

Use an auth_request to service proxied to:

• http://host:port just to authenticate user
• http://host:port/group1/group2/.. to also check user is in one of groups

Usage

Start executable with env vars for config, use -h for options.

Server configuration

service expects config to be set via env variables in /etc/default/nginx-goldap

If not using a service, you can start the process setting up the expected env variables

For the moment, LDAP is expected to allow anonymous search/bind and do not use TLS

Variables:

• PORT: optional port to listen, defaults to 9999
• LDAP_URL: ldap url (ldap://, ldaps://, prefered method)
• LDAP_HOST: ldap host address if not using LDAP_URL (old way, no TLS)
• LDAP_PORT: optional ldap port, defaults to 389 if not using LDAP_URL (old way)
• LDAP_USER: optional ldap user dn to bind with (if empty use unauthenticated bind)
• LDAP_PASSWORD: optional ldap user password to bind
• LDAP_USER_DN: ldap user search dn (example: ou=People,dc=genouest,dc=org)
• LDAP_GROUP_DN: ldap groups search dn (example: ou=Groups,dc=genouest,dc=org), expecting users to be in group memberUid (posixGroup)

Nginx configuration

Example nginx conf

server {
    listen       443 ssl http2;
    listen       [::]:443 ssl http2;
    server_name  myserver.genouest.org;
    root         /usr/share/nginx/html;

    ssl_certificate /etc/letsencrypt/live/genouest.org/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/genouest.org/privkey.pem;
    ssl_trusted_certificate /etc/letsencrypt/live/genouest.org/chain.pem;
    ssl_session_cache shared:SSL:1m;
    ssl_session_timeout  10m;
    ssl_ciphers HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers on;

    location / {
        auth_request /auth-proxy;
        error_page 401 =200 /;
        try_files $uri $uri/ =404;
    }

    location = /auth-proxy {
        internal;
        # just check user proxy_pass http://localhost:9999/;
        # check user and user is in groupA or groupB proxy_pass http://localhost:9999/groupA/groupB;
        proxy_pass http://localhost:9999/goadmin;
        proxy_pass_request_body off;
        proxy_set_header Content-Length "";
    }

    include /etc/nginx/errors.conf;

}