Monday, May 11, 2009

Auto SSH Login without Password

The SSH daemon validates SSH client access by Linux system verification via /etc/passwd, or by public/private key cryptography approach.

By using the public/private cryptography approach, we can do a SSH without password.

In my write-up it is for root-to-root connection. You can use it for user connections

Steps 1: At the Host Machine

  1. Logon to the root home directory.
  2. Make sure the hidden .ssh directory has the permission 700. If not execute the command
    chmod 700 .ssh
  3. Change Directory to .ssh directory by executing the command
    cd .ssh
  4. Generate the public-private keys using the ssh-keygen command.
    # ssh-keygen -t rsa 
  5. The resulting file id_rsa and rsa type public key
  6. # ssh-copy-id -i ~/.ssh/ remote-host
    (ssh-copy-id appends the keys to the remote-host’s .ssh/authorized_key)

Step 2: At the Remote Machine, test it out

  1. # ssh remote-host 
    (It should automatically login)
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