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41 lines
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ReStructuredText
41 lines
2 KiB
ReStructuredText
.. include:: serve.rst.inc
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Examples
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~~~~~~~~
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borg serve has special support for ssh forced commands (see ``authorized_keys``
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example below): it will detect that you use such a forced command and extract
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the value of the ``--restrict-to-path`` option(s).
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It will then parse the original command that came from the client, makes sure
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that it is also ``borg serve`` and enforce path restriction(s) as given by the
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forced command. That way, other options given by the client (like ``--info`` or
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``--umask``) are preserved (and are not fixed by the forced command).
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Environment variables (such as BORG_HOSTNAME_IS_UNIQUE) contained in the original
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command sent by the client are *not* interpreted, but ignored. If BORG_XXX environment
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variables should be set on the ``borg serve`` side, then these must be set in system-specific
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locations like ``/etc/environment`` or in the forced command itself (example below).
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::
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# Allow an SSH keypair to only run borg, and only have access to /path/to/repo.
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# Use key options to disable unneeded and potentially dangerous SSH functionality.
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# This will help to secure an automated remote backup system.
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$ cat ~/.ssh/authorized_keys
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command="borg serve --restrict-to-path /path/to/repo",restrict ssh-rsa AAAAB3[...]
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# Set a BORG_XXX environment variable on the "borg serve" side
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$ cat ~/.ssh/authorized_keys
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command="export BORG_XXX=value; borg serve [...]",restrict ssh-rsa [...]
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.. note::
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The examples above use the ``restrict`` directive. This does automatically
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block potential dangerous ssh features, even when they are added in a future
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update. Thus, this option should be preferred.
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If you're using openssh-server < 7.2, however, you have to explicitly specify
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the ssh features to restrict and cannot simply use the restrict option as it
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has been introduced in v7.2. We recommend to use
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``no-port-forwarding,no-X11-forwarding,no-pty,no-agent-forwarding,no-user-rc``
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in this case.
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