SSH
Secure Shell or SSH is a network protocol that allows data to be exchanged over a secure channel between two computers. Encryption provides confidentiality and integrity of data. SSH uses public-key cryptography to authenticate the remote computer and allow the remote computer to authenticate the user, if necessary.
In short, SSH allows you to connect to your board from a remote PC using a secured/encrypted Ethernet connection.
Installation
We use lightweight Dropbear SSH server. To add it to your rootfs then launch Buildroot configuration:
[armadeus] $ make menuconfig
and in package->network choose dropbear.
Then rebuild your system and flash it on your board or MMC.
Usage
First be sure to have setup a root password on your board. If not then:
# passwd Changing password for root Enter the new password (minimum of 5, maximum of 8 characters) Please use a combination of upper and lower case letters and numbers. Enter new password: ***** Re-enter new password: ****** Password changed.
If you have reflashed your rootfs with dropbear installed, then at first startup it should generates your private and public keys:
Generating RSA Key... Will output 1024 bit rsa secret key to '/etc/dropbear/dropbear_rsa_host_key' Generating key, this may take a while... Public key portion is: ssh-rsa ........ Fingerprint: md5 82:a2:a3:65:8c:e4:2b:ec:35:27:03:23:2c:f8:91:e9 Generating DSS Key... Will output 1024 bit dss secret key to '/etc/dropbear/dropbear_dss_host_key' Generating key, this may take a while... Public key portion is: ssh-dss ........ Fingerprint: md5 43:4d:e6:52:df:6b:1f:c3:93:e9:49:e3:92:e7:a1:b2 Starting dropbear sshd:
To test your SSH connection, then on your PC launch (replace 192.168.0.3 with your board IP):
[armadeus] $ ssh root@192.168.0.3 The authenticity of host '192.168.72.35 (192.168.72.35)' can't be established. RSA key fingerprint is 82:a2:a3:65:8c:e4:2b:ec:35:27:03:23:2c:f8:91:e9. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '192.168.72.35' (RSA) to the list of known hosts. root@192.168.72.35's password: BusyBox v1.2.2 (2007.06.25-15:53+0000) Built-in shell (ash) Enter 'help' for a list of built-in commands.
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