lifecycle: run worker as root and drop perms later to fix docker permission issues

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

Dockerfile

@@ -48,7 +48,7 @@ ARG GIT_BUILD_HASH
 ENV GIT_BUILD_HASH=$GIT_BUILD_HASH
 
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends curl ca-certificates gnupg git && \
+    apt-get install -y --no-install-recommends curl ca-certificates gnupg git runit && \
     curl https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add - && \
     echo "deb http://apt.postgresql.org/pub/repos/apt buster-pgdg main" > /etc/apt/sources.list.d/pgdg.list && \
     apt-get update && \
@@ -58,14 +58,7 @@ RUN apt-get update && \
     apt-get autoremove --purge -y && \
     apt-get clean && \
     rm -rf /tmp/* /var/lib/apt/lists/* /var/tmp/ && \
-    # This is quite hacky, but docker has no guaranteed Group ID
-    # we could instead check for the GID of the socket and add the user dynamically,
-    # but then we have to drop permmissions later
-    groupadd -g 998 docker_998 && \
-    groupadd -g 999 docker_999 && \
     adduser --system --no-create-home --uid 1000 --group --home /authentik authentik && \
-    usermod -a -G docker_998 authentik && \
-    usermod -a -G docker_999 authentik && \
     mkdir /backups && \
     chown authentik:authentik /backups
 
@@ -77,7 +70,6 @@ COPY ./lifecycle/ /lifecycle
 COPY --from=builder /work/authentik /authentik-proxy
 
 USER authentik
-STOPSIGNAL SIGINT
 ENV TMPDIR /dev/shm/
 ENV PYTHONUBUFFERED 1
 ENTRYPOINT [ "/lifecycle/bootstrap.sh" ]

docker-compose.yml

@@ -64,8 +64,13 @@ services:
       AUTHENTIK_POSTGRESQL__NAME: ${PG_DB:-authentik}
       AUTHENTIK_POSTGRESQL__PASSWORD: ${PG_PASS}
       # AUTHENTIK_ERROR_REPORTING__ENABLED: "true"
+    # This is optional, and can be removed. If you remove this, the following will happen
+    # - The permissions for the /backups and /media folders aren't fixed, so make sure they are 1000:1000
+    # - The docker socket can't be accessed anymore
+    user: root
     volumes:
       - ./backups:/backups
+      - ./media:/media
       - /var/run/docker.sock:/var/run/docker.sock
       - ./custom-templates:/templates
       - geoip:/geoip

lifecycle/bootstrap.sh

@@ -1,14 +1,29 @@
 #!/bin/bash -e
 python -m lifecycle.wait_for_db
 printf '{"event": "Bootstrap completed", "level": "info", "logger": "bootstrap", "command": "%s"}\n' "$@" > /dev/stderr
+
+function check_if_root {
+    if [[ $EUID -ne 0 ]]; then
+        printf '{"event": "Not running as root, disabling permission fixes", "level": "info", "logger": "bootstrap", "command": "%s"}\n' "$@" > /dev/stderr
+        return
+    fi
+    SOCKET="/var/run/docker.sock"
+    if [[ -e "$SOCKET" ]]; then
+        # Get group ID of the docker socket, so we can create a matching group and
+        # add ourselves to it
+        DOCKER_GID=$(stat -c '%g' $SOCKET)
+        usermod -a -G $DOCKER_GID authentik
+    fi
+    # Fix permissions of backups and media
+    chown -R authentik:authentik /media /backups
+}
+
 if [[ "$1" == "server" ]]; then
     python -m lifecycle.migrate
     /authentik-proxy
 elif [[ "$1" == "worker" ]]; then
-    celery -A authentik.root.celery worker --autoscale 3,1 -E -B -s /tmp/celerybeat-schedule -Q authentik,authentik_scheduled,authentik_events
-elif [[ "$1" == "migrate" ]]; then
-    printf "DEPERECATED: database migrations are now executed automatically on startup."
-    python -m lifecycle.migrate
+    check_if_root
+    chpst -u authentik env HOME=/authentik celery -A authentik.root.celery worker --autoscale 3,1 -E -B -s /tmp/celerybeat-schedule -Q authentik,authentik_scheduled,authentik_events
 elif [[ "$1" == "backup" ]]; then
     python -m manage dbbackup --clean
 elif [[ "$1" == "restore" ]]; then