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kxd - Online in the Cloud

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This is the command kxd that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



kxd - Key exchange daemon


kxd [--key=<file>] [--cert=<file>] [--data_dir=<directory>] [--email_from=<email-address>]
[--ip_addr=<ip-address>] [--logfile=<file>] [--port=<port>] [--smtp_addr=<host:port>]


kxd is a key exchange daemon, which serves blobs of data (keys) over https.

It can be used to get keys remotely instead of using local storage. The main use case is
to get keys to open dm-crypt devices automatically, without having to store them on the
local machine.


The server configuration is stored in a root directory (/etc/kxd/data/ by default), and
within there, with per-key directories (e.g. /etc/kxd/data/host1/key1/), each containing
the following files:

· key: Contains the key to give to the client.

· allowed_clients: Contains one or more PEM-encoded client certificates that will be
allowed to request the key. If not present, then no clients will be allowed to
access this key.

· allowed_hosts: Contains one or more host names (one per line). If not present, then
all hosts will be allowed to access that key (as long as they are authorized with a
valid client certificate).

· email_to: Contains one or more email destinations to notify (one per line). If not
present, then no notifications will be sent upon key accesses.


Private key to use. Defaults to /etc/kxd/key.pem.

Certificate to use; must match the given key. Defaults to /etc/kxd/cert.pem.

Data directory, where the key and configuration live (see the SETUP section above).
Defaults to /etc/kxd/data.

Email address to send email from.

IP address to listen on. Defaults to, which means all.

File to write logs to, use '-' for stdout. By default, the daemon will log to

Port to listen on. The default port is 19840.

Address of the SMTP server to use to send emails. If none is given, then emails
will not be sent.

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