matrix-docker-ansible-deploy/roles/matrix-nginx-proxy/templates/systemd/matrix-nginx-proxy.service.j2
Slavi Pantaleev 316d653d3e Drop capabilities in containers
We run containers as a non-root user (no effective capabilities).

Still, if a setuid binary is available in a container image, it could
potentially be used to give the user the default capabilities that the
container was started with. For Docker, the default set currently is:
- "CAP_CHOWN"
- "CAP_DAC_OVERRIDE"
- "CAP_FSETID"
- "CAP_FOWNER"
- "CAP_MKNOD"
- "CAP_NET_RAW"
- "CAP_SETGID"
- "CAP_SETUID"
- "CAP_SETFCAP"
- "CAP_SETPCAP"
- "CAP_NET_BIND_SERVICE"
- "CAP_SYS_CHROOT"
- "CAP_KILL"
- "CAP_AUDIT_WRITE"

We'd rather prevent such a potential escalation by dropping ALL
capabilities.

The problem is nicely explained here: https://github.com/projectatomic/atomic-site/issues/203
2019-01-28 11:22:54 +02:00

35 lines
1.2 KiB
Django/Jinja

[Unit]
Description=Matrix nginx-proxy server
{% for service in matrix_nginx_proxy_systemd_required_services_list %}
Requires={{ service }}
After={{ service }}
{% endfor %}
{% for service in matrix_nginx_proxy_systemd_wanted_services_list %}
Wants={{ service }}
{% endfor %}
[Service]
Type=simple
ExecStartPre=-/usr/bin/docker kill matrix-nginx-proxy
ExecStartPre=-/usr/bin/docker rm matrix-nginx-proxy
ExecStart=/usr/bin/docker run --rm --name matrix-nginx-proxy \
--log-driver=none \
--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
--cap-drop=ALL \
--network={{ matrix_docker_network }} \
-p 80:8080 \
-p 443:8443 \
-v {{ matrix_nginx_proxy_data_path }}/nginx.conf:/etc/nginx/nginx.conf:ro \
-v {{ matrix_nginx_proxy_confd_path }}:/etc/nginx/conf.d:ro \
-v {{ matrix_ssl_config_dir_path }}:{{ matrix_ssl_config_dir_path }}:ro \
-v {{ matrix_static_files_base_path }}:{{ matrix_static_files_base_path }}:ro \
{{ matrix_nginx_proxy_docker_image }}
ExecStop=-/usr/bin/docker kill matrix-nginx-proxy
ExecStop=-/usr/bin/docker rm matrix-nginx-proxy
ExecReload=/usr/bin/docker exec matrix-nginx-proxy /usr/sbin/nginx -s reload
Restart=always
RestartSec=30
[Install]
WantedBy=multi-user.target