316d653d3e
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
49 lines
1.7 KiB
Django/Jinja
49 lines
1.7 KiB
Django/Jinja
[Unit]
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Description=Matrix Synapse server
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{% for service in matrix_synapse_systemd_required_services_list %}
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Requires={{ service }}
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After={{ service }}
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{% endfor %}
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{% for service in matrix_synapse_systemd_wanted_services_list %}
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Wants={{ service }}
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{% endfor %}
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[Service]
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Type=simple
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ExecStartPre=-/usr/bin/docker kill matrix-synapse
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ExecStartPre=-/usr/bin/docker rm matrix-synapse
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{% if matrix_s3_media_store_enabled %}
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# Allow for some time before starting, so that media store can mount.
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# Mounting can happen later too, but if we start writing,
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# we'd write files to the local filesystem and fusermount will complain.
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ExecStartPre=/bin/sleep 5
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{% endif %}
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ExecStart=/usr/bin/docker run --rm --name matrix-synapse \
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--log-driver=none \
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--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
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--cap-drop=ALL \
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--entrypoint=python \
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--network={{ matrix_docker_network }} \
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-e SYNAPSE_CACHE_FACTOR={{ matrix_synapse_cache_factor }} \
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{% if matrix_synapse_federation_enabled %}
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-p 8448:8448 \
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{% endif %}
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{% if matrix_synapse_container_expose_client_server_api_port %}
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-p 127.0.0.1:8008:8008 \
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{% endif %}
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-v {{ matrix_synapse_config_dir_path }}:/data \
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-v {{ matrix_synapse_run_path }}:/matrix-run \
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-v {{ matrix_synapse_base_path }}/storage:/matrix-media-store-parent:slave \
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{% for volume in matrix_synapse_container_additional_volumes %}
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-v {{ volume.src }}:{{ volume.dst }}:{{ volume.options }} \
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{% endfor %}
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{{ matrix_synapse_docker_image }} \
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-m synapse.app.homeserver -c /data/homeserver.yaml
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ExecStop=-/usr/bin/docker kill matrix-synapse
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ExecStop=-/usr/bin/docker rm matrix-synapse
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Restart=always
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RestartSec=30
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[Install]
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WantedBy=multi-user.target
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