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Code Issues Releases Wiki Activity

borg serve: improve ssh forced commands docs (#6083)

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borg serve: improve ssh forced commands docs

Co-authored-by: Andrey Bienkowski <hexagon-recursion@posteo.net>
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Andrey Bienkowski 2021-12-10 17:11:25 +00:00 • committed by GitHub
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1
docs/deployment/hosting-repositories.rst
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@ -82,3 +82,4 @@ basis.
Refer to the `sshd(8) <https://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man8/sshd.8>`_
man page for more details on SSH options.
See also :ref:`borg_serve`

17
docs/usage/serve.rst
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@ -3,14 +3,16 @@
Examples
~~~~~~~~
borg serve has special support for ssh forced commands (see ``authorized_keys``
example below): it will detect that you use such a forced command and extract
the value of the ``--restrict-to-path`` option(s).
``borg serve`` has special support for ssh forced commands (see ``authorized_keys``
example below): if the environment variable SSH_ORIGINAL_COMMAND is set it will
ignore some options given on the command line and use the values from the
variable instead. This only applies to a carefully controlled allowlist of safe
options. This list currently contains:
It will then parse the original command that came from the client, makes sure
that it is also ``borg serve`` and enforce path restriction(s) as given by the
forced command. That way, other options given by the client (like ``--info`` or
``--umask``) are preserved (and are not fixed by the forced command).
- Options that control the log level and debug topics printed
such as ``--verbose``, ``--info``, ``--debug``, ``--debug-topic``, etc.
- ``--lock-wait`` to allow the client to control how long to wait before
giving up and aborting the operation when another process is holding a lock.
Environment variables (such as BORG_XXX) contained in the original
command sent by the client are *not* interpreted, but ignored. If BORG_XXX environment
@ -40,6 +42,7 @@ locations like ``/etc/environment`` or in the forced command itself (example bel
``no-port-forwarding,no-X11-forwarding,no-pty,no-agent-forwarding,no-user-rc``
in this case.
Details about sshd usage: `sshd(8) <https://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man8/sshd.8>`_
SSH Configuration
~~~~~~~~~~~~~~~~~