Dropbear

Dropbear is a relatively small SSH server and client. It runs on a variety of POSIX-based platforms. Dropbear is particularly useful for "embedded" type Linux systems

Enabling dropbear

How to enable Dropbear server

1-Open sdk configuration system

$ make config

2- Enable Dropbear server:

-> File System Configuration
  -> Select target's file system software 
    [*] dropbear-0.52 (SSH Server)

3- When you check Dropbear server, you can enable scp and ssh

-*- dropbear-0.52 (SSH Server)
[*]   Enable dbclient (SSH Client)
[*]   Enable scp

Commands to use ssh

$ dbclient user@host 

Commands to use scp

$ scp <file> user@host:/<location>

Setting keys to get ssh connections without password requests

To enable this option you can use the script

How to get public and private keys of Dropbear in the target manually

You can use "dropbearkey" tool to create public and private keys or see public keys

To create an pair of keys you can run the following command:

$ dropbearkey -t rsa -f /etc/dropbear/dropbear_rsa_host_key

Commands to use ssh without password request

$ dbclient user@host -i /etc/dropbear/dropbear_rsa_host_key

Commands to use scp without password request

$ scp <file> user@host:/<location> -i /etc/dropbear/dropbear_rsa_host_key