Automatically connect to a remote SSH server and remotely forward a local
port using SSH's built-in remote forwarding feature (the -R argument).
The various parameters for setting up the port forwarding are configured using snap configuration parameters. Set the various values as follows (changing the values as needed):
snap set hintertuer local-port="443"
snap set hintertuer local-host="localhost"
snap set hintertuer remote-port="10443"
snap set hintertuer remote-host="myhost.example.com"
snap set hintertuer remote-addr="localhost"
snap set hintertuer user="ubuntu"
This example configuration will result in port 443 (local-port) on the host localhost (local-host), as if it were accessed by the client host (where the snap is installed), being made available on port 10443 (remote-port) on myhost.example.com (remote-host), bound to the address localhost (remote-addr).
In order to improve security, the remote host's key must be configured.
You can obtain the key by using the ssh-keyscan utility, and configuring the
snap with that key:
snap set hintertuer host-key="..."
Or combine it into one line:
snap set hintertuer \
host-key="$(ssh-keyscan $(snap get hintertuer remote-host))"
The snap will generate a new SSH key called "id_ecdsa" and try to use that to connect to the remote host. This file is stored in the snap's common data path (normally /var/snap/hintertuer/common/). This file can be overwritten, or another file in that directory can be used by running the following command:
snap set hintertuer ssh-key="id_ecdsa"
After changing any of the configuration options, make sure to restart the snap:
snap restart hintertuer
The name "Hintertuer" comes from the German translation for "backdoor".
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Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
Snap is available for CentOS 7.6+, and Red Hat Enterprise Linux 7.6+, from the Extra Packages for Enterprise Linux (EPEL) repository. The EPEL repository can be added to your system with the following command:
sudo yum install epel-release
Snap can now be installed as follows:
sudo yum install snapd
Once installed, the systemd unit that manages the main snap communication socket needs to be enabled:
sudo systemctl enable --now snapd.socket
To enable classic snap support, enter the following to create a symbolic link between /var/lib/snapd/snap and /snap:
sudo ln -s /var/lib/snapd/snap /snap
Either log out and back in again, or restart your system, to ensure snap’s paths are updated correctly.
To install hintertuer, simply use the following command:
sudo snap install hintertuer
Browse and find snaps from the convenience of your desktop using the snap store snap.
Interested to find out more about snaps? Want to publish your own application? Visit snapcraft.io now.
