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backups: Show proper error when SSH server is not reachable

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The backup module is connecting to the remote backup host using ssh-keyscan to
get a list of SSH public keys. When the connection fails, the form should inform
the user that there was a problem, instead of simply not listing any SSH public
keys.

Closes: #1656.

Signed-off-by: Birger Schacht <birger@rantanplan.org>
[sunil: Minor indentation]
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>
This commit is contained in:
Birger Schacht 2019-11-05 15:45:35 +01:00 committed by Sunil Mohan Adapa
parent 7cb7369ff4
commit 25bcee6488
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1 changed files with 35 additions and 25 deletions
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60
plinth/modules/backups/templates/verify_ssh_hostkey.html
View File

@ -28,35 +28,45 @@
<form class="form" method="post">
{% csrf_token %}
<p>
The authenticity of SSH host {{ hostname }} could not be established. The host advertises the following SSH public keys. Please verify any one of them.
</p>
<section>
{% if form.ssh_public_key|length_is:"0" %}
<p>
<a class="btn btn-default collapsed collapsible-button"
data-toggle="collapse" href="#help" aria-expanded="false">
<span class="fa fa-chevron-right fa-fw" aria-hidden="true"></span>
{% trans "How to verify?" %}
</a>
{% blocktrans trimmed %}
Could not reach SSH host {{ hostname }}. Please verify that the host
is up and accepting connections.
{% endblocktrans %}
</p>
{% else %}
<p>
The authenticity of SSH host {{ hostname }} could not be established. The host advertises the following SSH public keys. Please verify any one of them.
</p>
<div class="collapse panel-body" id="help">
<p>
{% blocktrans trimmed %}
Run the following command on the SSH host machine. The output should
match one of the provided options. You can also use dsa, ecdsa,
ed25519 etc. instead of rsa, by choosing the corresponding file.
{% endblocktrans %}
</p>
<p>
<code>sudo ssh-keygen -lf /etc/ssh/ssh_host_rsa_key</code>
</p>
</div>
</section>
{{ form|bootstrap }}
<section>
<p>
<a class="btn btn-default collapsed collapsible-button"
data-toggle="collapse" href="#help" aria-expanded="false">
<span class="fa fa-chevron-right fa-fw" aria-hidden="true"></span>
{% trans "How to verify?" %}
</a>
</p>
<div class="collapse panel-body" id="help">
<p>
{% blocktrans trimmed %}
Run the following command on the SSH host machine. The output
should match one of the provided options. You can also use dsa,
ecdsa, ed25519 etc. instead of rsa, by choosing the corresponding
file.
{% endblocktrans %}
</p>
<p>
<code>sudo ssh-keygen -lf /etc/ssh/ssh_host_rsa_key</code>
</p>
</div>
</section>
<input type="submit" class="btn btn-primary" value="{% trans 'Verify Host' %}"/>
{{ form|bootstrap }}
<input type="submit" class="btn btn-primary" value="{% trans 'Verify Host' %}"/>
{% endif %}
</form>
{% endblock %}