Skip to main content

Raymii.org Raymii.org Logo

Quis custodiet ipsos custodes?
Home | About | All pages | Cluster Status | RSS Feed | Gopher

Where is dropbearconvert on Ubuntu?

Published: 02-04-2019 | Author: Remy van Elst | Text only version of this article


❗ This post is over two years old. It may no longer be up to date. Opinions may have changed.

Dropbear is a lightweight SSH server and client implementation, often used on embedded systems and routers. If you use the dropbear SSH client (dbclient) and want to use a private key, it needs to be in the dropbear format and cannot have a passphrase. Dropbear provides a conversion utility to convert openssh style keys to dropbear style keys, dropbearconvert, but on Ubuntu it's not in your $PATH. This means you have to provide the full path to execute it, which is cumbersome. There is a bug in Ubuntu that has been reported in 2012, but in Ubuntu 18.04 (2019) it's still not fixed.

This is the full path to dropbearconvert:

/usr/lib/dropbear/dropbearconvert

This is an example to convert an OpenSSH style private key to a dropbear style private key:

usr/lib/dropbear/dropbearconvert openssh dropbear ~/.ssh/id_rsa ~/.ssh/id_rsa_dropbear

Your dropear style private key will be located in ~/.ssh/id_rsa ~/.ssh/id_rsa_dropbear.

Do note that your private key cannot be protected with a passphrase. Dropbear does not support this.

Consider sponsoring me on Github. It means the world to me if you show your appreciation and you'll help pay the server costs.

You can also sponsor me by getting a Digital Ocean VPS. With this referral link you'll get $100 credit for 60 days.

Tags: bug , dropbear , openssh , snippets , ssh , ubuntu