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85 lines
3.4 KiB
ReStructuredText
.. include:: ../global.rst.inc
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.. highlight:: none
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.. _hosting_repositories:
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Hosting repositories
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====================
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This sections shows how to provide repository storage securely for users.
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Optionally, each user can have a storage quota.
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Repositories are accessed through SSH. Each user of the service should
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have her own login which is only able to access the user's files.
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Technically it would be possible to have multiple users share one login,
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however, separating them is better. Separate logins increase isolation
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and are thus an additional layer of security and safety for both the
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provider and the users.
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For example, if a user manages to breach ``borg serve`` then she can
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only damage her own data (assuming that the system does not have further
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vulnerabilities).
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Use the standard directory structure of the operating system. Each user
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is assigned a home directory and repositories of the user reside in her
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home directory.
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The following ``~user/.ssh/authorized_keys`` file is the most important
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piece for a correct deployment. It allows the user to log in via
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their public key (which must be provided by the user), and restricts
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SSH access to safe operations only.
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::
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command="borg serve --restrict-to-repository /home/<user>/repository",restrict
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<key type> <key> <key host>
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.. note:: The text shown above needs to be written on a **single** line!
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.. warning::
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If this file should be automatically updated (e.g. by a web console),
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pay **utmost attention** to sanitizing user input. Strip all whitespace
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around the user-supplied key, ensure that it **only** contains ASCII
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with no control characters and that it consists of three parts separated
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by a single space. Ensure that no newlines are contained within the key.
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The ``restrict`` keyword enables all restrictions, i.e. disables port, agent
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and X11 forwarding, as well as disabling PTY allocation and execution of ~/.ssh/rc.
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If any future restriction capabilities are added to authorized_keys
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files they will be included in this set.
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The ``command`` keyword forces execution of the specified command line
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upon login. This must be ``borg serve``. The ``--restrict-to-repository``
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option permits access to exactly **one** repository. It can be given
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multiple times to permit access to more than one repository.
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The repository may not exist yet; it can be initialized by the user,
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which allows for encryption.
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**Storage quotas** can be enabled by adding the ``--storage-quota`` option
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to the ``borg serve`` command line::
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restrict,command="borg serve --storage-quota 20G ..." ...
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The storage quotas of repositories are completely independent. If a
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client is able to access multiple repositories, each repository
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can be filled to the specified quota.
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If storage quotas are used, ensure that all deployed Borg releases
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support storage quotas.
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Refer to :ref:`internals_storage_quota` for more details on storage quotas.
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**Specificities: Append-only repositories**
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Running ``borg init`` via a ``borg serve --append-only`` server will **not**
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create a repository that is configured to be append-only by its repository
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config.
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But, ``--append-only`` arguments in ``authorized_keys`` will override the
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repository config, therefore append-only mode can be enabled on a key by key
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basis.
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Refer to the `sshd(8) <https://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man8/sshd.8>`_
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man page for more details on SSH options.
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See also :ref:`borg_serve`
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