Here are 2 easy steps to ssh into a host without login:
Remote host IP: 192.168.1.25 Remote host Username: root
Note: We need OpenSSH to be installed on the remote host for this to work.
- From your PC run the following command:
root@mehrdust# ssh-keygen -t rsa
now a file named authorized_keys should have been created on you .ssh folder.
# ls -l /root/.ssh -rw------- 1 root root 1679 2011-11-09 10:55 id_rsa -rw-r--r-- 1 root root 402 2011-11-09 10:55 id_rsa.pub
2. Run the following command to copy this key to the remote host:
# ssh-copy-id -i /root/.ssh/id_rsa.pub email@example.com The authenticity of host '192.168.1.25 (192.168.1.25)' can't be established. RSA key fingerprint is ef:23:31:87:a9:fa:cc:e7:fd:d2:5a:1a:d9:e2:35:4a. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '192.168.1.25' (RSA) to the list of known hosts. firstname.lastname@example.org's password: Now try logging into the machine, with "ssh 'email@example.com'", and check in: .ssh/authorized_keys to make sure we haven't added extra keys that you weren't expecting.
At this point the id_rsa.pub is copied to the remote host as authorized_keys. After this you can ssh firstname.lastname@example.org and login without being prompt for password.