SSH Passwordless Authendication

Password less Authentication

To Know ssh version: $ssh –V

Make sure the following directory present in Home Directory before continue

For Open SSH = .ssh SSH2 = .ssh2

OpenSSH => OpenSSH

Local=braves; Remote=reds

What we’re doing	How	Where
1. Generate SSH Keys	$ssh-keygen –b 1024 -t dsa -f .ssh/id_dsa	Local
2. Copy the Public Key file with Hostname	$cp –p .ssh/id_dsa.pub .ssh/braves.pub	Local
3. Add Private Key Info to Identification file	$echo “IDKey id_dsa” > .ssh/identification	Local
4. Add Public Key Info to authorization file	$echo “Key braves.pub” >> .ssh/authorization	Local
5. Add Public Key to the list of keys	$more .ssh/braves.pub >> .ssh/authorized_keys	Local
6. Copy Public Key to the Remote Machine	$scp –p .ssh/braves.pub REMOTE:/$HOME/.ssh	Local
7. Add Public Key to the list of keys	$more .ssh/braves.pub >> .ssh/authorized_keys	Remote
8. Add Public Key Info to authorization file	$echo “Key braves.pub” >> .ssh/authorization	Remote
8. Set up permissions	$chmod 640 .ssh/authorized_keys	Remote
9. Set up permissions	$chmod 700 $HOME/.ssh/	Remote

You can now ssh from LOCAL to REMOTE without a password.

If suppose Want to Establish password less authentication from braves to phillies proceed from step 6.

SSH2 => SSH2

Follow all the steps used for OpenSSH => OpenSSH only thing to notice is SSH2 directory is .ssh2 in home directory.

OpenSSH => SSH2

Local=braves; Remote=greg

From OpenSSH (braves), to SSH2 (greg)

What we're doing	How	Where
1. Generate SSH Keys	$ssh-keygen –b 1024 -t dsa -f .ssh/id_dsa	Local
2. Copy the Public Key file with Hostname	$cp –p .ssh/id_dsa.pub .ssh/braves.pub	Local
3. Add Private Key Info to Identification file	$echo “IDKey id_dsa” > .ssh/identification	Local
4. Add Public Key Info to authorization file	$echo “Key braves.pub” >> .ssh/authorization	Local
5. Add Public Key to the list of keys	$more .ssh/braves.pub >> .ssh/authorized_keys	Local
6. Convert Open SSH Public Key to SECSH format	$ssh-keygen -e -f .ssh/braves.pub >> .ssh/braves.pub.secsh	Local
7. Copy SECSH format Public Key to the Remote Machine	$scp –p .ssh/braves.pub.secsh REMOTE:/$HOME/.ssh2	Local
8. Rename Public Key with original host name	$mv .ssh2/braves.pub.secsh .ssh2/braves.pub	Remote
9. Add Public Key to the list of keys	$more .ssh2/braves.pub >> .ssh2/authorized_keys	Remote
10. Add Public Key Info to authorization file	$echo “Key braves.pub” >> .ssh2/authorization	Remote
11. Set up permissions	$chmod 640 .ssh2/authorized_keys	Remote
12. Set up permissions	$chmod 700 $HOME/.ssh2/	Remote

SSH2 => OpenSSH

Local=greg Remote=reds

From SSH2 (greg), to OpenSSH (reds)

What we're doing		How	Where
1. Generate SSH Keys		$ssh-keygen –b 1024 -t dsa	Local
2. Copy the Public Key file with Hostname		$cp –p .ssh2/id_dsa_1024_a.pub .ssh2/greg.pub	Local
3. Add Private Key Info to Identification file		echo "IDKey id_dsa_1024_a" > .ssh2/identification	Local
4. Add Public Key Info to authorization file		$echo “Key greg.pub” >> .ssh2/authorization	Local
5. Add Public Key to the list of keys		$more .ssh2/greg.pub >> .ssh2/authorized_keys	Local
6. Copy SECSH Public Key to the Remote Machine		$scp –p .ssh2/greg.pub REMOTE:/$HOME/.ssh	Local
7. Convert SECSH Public Key to Open SSH format		$ssh-keygen -i -f .ssh/greg.pub >> .ssh/greg.pub.openssh	Remote
8. Rename Public Key with original host name		$mv .ssh/greg.pub.openssh .ssh/greg.pub	Remote
9. Add Public Key to the list of keys	$more .ssh/greg.pub >> .ssh/authorized_keys		Remote
10. Add Public Key Info to authorization file	$echo “Key greg.pub” >> .ssh/authorization		Remote
11. Set up permissions	$chmod 640 .ssh/authorized_keys		Remote
12. Set up permissions	$chmod 700 $HOME/.ssh/		Remote

Enjoy.