nextcloud: Drop network namespacing in container, use host network

- This is not ideal and reduces security. However it simplifies quite a bit of
setup.

- Services on the host network are already exposed to the container (however,
they could easily be protected with firewall rules).

- Container has full access to external networks already. So this part does not
change.

- This setup would be at par with how other services run on FreedomBox right
now. We can think of generalized solution for all the apps later.

- FirewallLocalProtection for the single service the runs in the container works
as usual without change.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

plinth/action_utils.py

@@ -489,51 +489,27 @@ def is_package_manager_busy():
         return False
 
 
-def podman_create(network_name: str, subnet: str, bridge_ip: str,
-                  host_port: str, container_port: str, container_ip: str,
-                  container_name: str, image_name: str,
+def podman_create(container_name: str, image_name: str,
                   volumes: dict[str, str] | None = None,
                   env: dict[str, str] | None = None):
     """Remove and recreate a podman container."""
-    service_stop(f'{network_name}-network.service')
     service_stop(container_name)
 
-    subprocess.run(['podman', 'network', 'rm', '--force', network_name],
-                   check=False)
-
     directory = pathlib.Path('/etc/containers/systemd')
     directory.mkdir(parents=True, exist_ok=True)
 
-    # Create bridge network
-    network_file = directory / f'{network_name}.network'
-    contents = f'''[Network]
-DNS={bridge_ip}
-Driver=bridge
-Gateway={bridge_ip}
-NetworkName={network_name}
-Subnet={subnet}
-PodmanArgs=--interface-name={network_name}
-'''
-    network_file.write_text(contents)
-
     service_file = directory / f'{container_name}.container'
     volume_lines = '\n'.join([
         f'Volume={source}:{dest}' for source, dest in (volumes or {}).items()
     ])
     env_lines = '\n'.join(
         [f'Environment={key}={value}' for key, value in (env or {}).items()])
-    contents = f'''[Unit]
-Requires=nextcloud-fbx-network.service
-After=nextcloud-fbx-network.service
-
-[Container]
+    contents = f'''[Container]
 AutoUpdate=registry
 ContainerName=%N
 {env_lines}
 Image={image_name}
-IP={container_ip}
-Network={network_name}
-PublishPort=127.0.0.1:{host_port}:{container_port}
+Network=host
 {volume_lines}
 
 [Service]
@@ -546,16 +522,10 @@ WantedBy=default.target
     service_daemon_reload()
 
 
-def podman_uninstall(container_name: str, network_name: str, volume_name: str,
-                     image_name: str):
+def podman_uninstall(container_name: str, volume_name: str, image_name: str):
     """Remove a podman container's components and systemd unit."""
     subprocess.run(['podman', 'volume', 'rm', volume_name], check=True)
     subprocess.run(['podman', 'image', 'rm', image_name], check=True)
-    subprocess.run(['podman', 'network', 'rm', '--force', network_name],
-                   check=True)
-    network_file = pathlib.Path(
-        '/etc/containers/systemd/') / f'{network_name}.network'
-    network_file.unlink(missing_ok=True)
     service_file = pathlib.Path(
         '/etc/containers/systemd/') / f'{container_name}.container'
     service_file.unlink(missing_ok=True)

plinth/modules/nextcloud/privileged.py

@@ -15,9 +15,6 @@ import augeas
 from plinth import action_utils
 from plinth.actions import privileged
 
-NETWORK_NAME = 'nextcloud-fbx'
-BRIDGE_IP = '172.16.16.1'
-CONTAINER_IP = '172.16.16.2'
 CONTAINER_NAME = 'nextcloud-freedombox'
 SERVICE_NAME = 'nextcloud-freedombox'
 VOLUME_NAME = 'nextcloud-volume-freedombox'
@@ -58,15 +55,10 @@ def setup():
         '/run/slapd/ldapi': '/run/slapd/ldapi',
         VOLUME_NAME: '/var/www/html'
     }
-    env = {'TRUSTED_PROXIES': BRIDGE_IP, 'OVERWRITEWEBROOT': '/nextcloud'}
-    action_utils.podman_create(network_name=NETWORK_NAME,
-                               subnet='172.16.16.0/24', bridge_ip=BRIDGE_IP,
-                               host_port='8181', container_port='80',
-                               container_ip=CONTAINER_IP,
-                               container_name=CONTAINER_NAME,
+    env = {'TRUSTED_PROXIES': '127.0.0.1', 'OVERWRITEWEBROOT': '/nextcloud'}
+    action_utils.podman_create(container_name=CONTAINER_NAME,
                                image_name=IMAGE_NAME, volumes=volumes, env=env)
     action_utils.service_start(CONTAINER_NAME)
-    _configure_firewall(action='add', interface_name=NETWORK_NAME)
 
     # OCC isn't immediately available after the container is spun up.
     # Wait until CAN_INSTALL file is available.
@@ -156,14 +148,6 @@ def set_default_phone_region(region: str):
     _run_occ('config:system:set', 'default_phone_region', '--value', region)
 
 
-def _configure_firewall(action, interface_name):
-    subprocess.run([
-        'firewall-cmd', '--permanent', '--zone=trusted',
-        f'--{action}-interface={interface_name}'
-    ], check=True)
-    action_utils.service_restart('firewalld')
-
-
 def _database_query(query: str):
     """Run a database query."""
     subprocess.run(['mysql'], input=query.encode(), check=True)
@@ -292,9 +276,7 @@ WantedBy=timers.target
 def uninstall():
     """Uninstall Nextcloud"""
     _drop_database()
-    _configure_firewall(action='remove', interface_name=NETWORK_NAME)
     action_utils.podman_uninstall(container_name=CONTAINER_NAME,
-                                  network_name=NETWORK_NAME,
                                   volume_name=VOLUME_NAME,
                                   image_name=IMAGE_NAME)
     for path in [_cron_service_file, _cron_timer_file]: