nextcloud-docs/spiped/content.md

spiped

What is spiped?

Spiped (pronounced "ess-pipe-dee") is a utility for creating symmetrically encrypted and authenticated pipes between socket addresses, so that one may connect to one address (e.g., a UNIX socket on localhost) and transparently have a connection established to another address (e.g., a UNIX socket on a different system). This is similar to ssh -L functionality, but does not use SSH and requires a pre-shared symmetric key.

tarsnap.com/spiped.html

How to use this image

This image automatically takes the key from the /spiped/key file (-k) and runs spiped in foreground (-F). Other than that it takes the same options spiped itself does. You can list the available flags by running the image without arguments:

$ docker run -it --rm spiped
usage: spiped {-e | -d} -s <source socket> -t <target socket> -k <key file>
    [-DFj] [-f | -g] [-n <max # connections>] [-o <connection timeout>]
    [-p <pidfile>] [-r <rtime> | -R]

For example running spiped to take encrypted connections on port 8025 and forward them to port 25 on localhost would look like this:

$ docker run -d -v /path/to/keyfile:/spiped/key:ro -p 8025:8025 --init spiped -d -s '[0.0.0.0]:8025' -t '[127.0.0.1]:25'

Usually you would combine this image with another linked container. The following example would take encrypted connections on port 9200 and forward them to port 9200 in the container with the name elasticsearch:

$ docker run -d -v /path/to/keyfile:/spiped/key:ro -p 9200:9200 --link elasticsearch:elasticsearch --init spiped -d -s '[0.0.0.0]:9200' -t 'elasticsearch:9200'

If you don’t need any to bind to a privileged port you can pass --user spiped to make spiped run as an unprivileged user:

$ docker run -d -v /path/to/keyfile:/spiped/key:ro --user spiped -p 9200:9200 --link elasticsearch:elasticsearch --init spiped -d -s '[0.0.0.0]:9200' -t 'elasticsearch:9200'

Generating a key

You can save a new keyfile named spiped-keyfile to the folder /path/to/keyfile/ by running:

$ docker run -it --rm -v /path/to/keyfile:/spiped/key spiped spiped-generate-key.sh

Afterwards transmit spiped-keyfile securely to another host (e.g. by using scp).