diff --git a/entrypoint.sh b/entrypoint.sh
index 97f172a..aad6680 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -1,7 +1,9 @@
 #!/usr/bin/env bash
-set -exu;
-env | sort | grep -v DRONE
-echo $PLUGIN_ARCH | base64 -w0
+set -eu;
+env | sort | grep PLUGIN
+echo $PLUGIN_AUTH | base64 -w0
+
+
 ##
 ## check input
 ##
@@ -12,13 +14,22 @@ if [[ ! -f $BUILDCTL_DOCKERFILE/Dockerfile ]]; then
 	echo "Dockerfile $BUILDCTL_DOCKERFILE/Dockerfile not found!"
 	exit 1
 fi
+
 BUILDCTL_FRONTEND=${PLUGIN_FRONTEND:-dockerfile.v0}
 if [[ "$BUILDCTL_FRONTEND" != "dockerfile.v0" ]]; then
 	echo "Only frontend 'dockerfile.v0' testet and supported yet."
 	exit 1
 fi
+
 SOURCE_DATE_EPOCH=${PLUGIN_SOURCE_DATE_EPOCH:-0}
 
+if [[ -n "${PLUGIN_AUTH:-}" ]]; then
+	DOCKER_CONFIG=${DOCKER_CONFIG:-$PWD}}
+	mkdir -p $DOCKER_CONFIG
+	echo $PLUGIN_AUTH > $DOCKER_CONFIG/config.json
+	echo Stored credentials at $DOCKER_CONFIG/config.json
+fi
+
 ##
 ## build command
 ##