Use OpenResty instead of plain nginx to support OpenID Connect authorization.

Author: Subv

backend/templates/_openid_connect.conf

@@ -0,0 +1,26 @@
+{% if openidc_enabled -%}
+    access_by_lua_block {
+	    local openidc = require("resty.openidc")
+        local opts = {
+            redirect_uri = "{{- openidc_redirect_uri -}}",
+            discovery = "{{- openidc_discovery -}}",
+            token_endpoint_auth_method = "{{- openidc_auth_method -}}",
+            client_id = "{{- openidc_client_id -}}",
+            client_secret = "{{- openidc_client_secret -}}",
+            scope = "openid email profile"
+        }
+
+        local res, err = openidc.authenticate(opts)
+
+        if err then
+            ngx.status = 500
+            ngx.say(err)
+            ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR)
+        end
+
+
+        ngx.req.set_header("X-OIDC-SUB", res.id_token.sub)
+        ngx.req.set_header("X-OIDC-EMAIL", res.id_token.email)
+        ngx.req.set_header("X-OIDC-NAME", res.id_token.name)
+    }
+{% endif %}

backend/templates/proxy_host.conf

@@ -51,7 +51,8 @@ proxy_http_version 1.1;
 
     {% endif %}
 
-{% include "_hsts.conf" %}
+    {% include "_openid_connect.conf" %}
+    {% include "_hsts.conf" %}
 
     {% if allow_websocket_upgrade == 1 or allow_websocket_upgrade == true %}
     proxy_set_header Upgrade $http_upgrade;

docker/rootfs/etc/nginx/nginx.conf

@@ -43,6 +43,16 @@ http {
 	proxy_cache_path              /var/lib/nginx/cache/public  levels=1:2 keys_zone=public-cache:30m max_size=192m;
 	proxy_cache_path              /var/lib/nginx/cache/private levels=1:2 keys_zone=private-cache:5m max_size=1024m;
 
+	lua_package_path '~/lua/?.lua;;';
+
+	lua_ssl_trusted_certificate /etc/ssl/certs/ca-certificates.crt;
+	lua_ssl_verify_depth 5;
+
+	# cache for discovery metadata documents
+	lua_shared_dict discovery 1m;
+	# cache for JWKs
+	lua_shared_dict jwks 1m;
+
 	log_format proxy '[$time_local] $upstream_cache_status $upstream_status $status - $request_method $scheme $host "$request_uri" [Client $remote_addr] [Length $body_bytes_sent] [Gzip $gzip_ratio] [Sent-to $server] "$http_user_agent" "$http_referer"';
 	log_format standard '[$time_local] $status - $request_method $scheme $host "$request_uri" [Client $remote_addr] [Length $body_bytes_sent] [Gzip $gzip_ratio] "$http_user_agent" "$http_referer"';