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Top Forums Shell Programming and Scripting keypair generation for passwordless sftp Post 302552917 by dips_ag on Tuesday 6th of September 2011 06:11:55 AM
Old 09-06-2011
keypair generation for passwordless sftp

Hi,

I want to establish a passwordless sftp between the two servers. I've searched the net and know the steps to be taken; which are as follows:

Code:
 
[local_user@local_server.com]$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (~/.ssh/id_rsa):
~/.ssh/id_rsa already exists.
Overwrite (y/n)? y
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in ~/.ssh/id_rsa.
Your public key has been saved in ~/.ssh/id_rsa.pub.
The key fingerprint is:
16:e9:ag:29:34:45:7b:3f:ab:5b:1a:fb:37:cc:11:9f local_user@local_server.com

And then I copied the public key in ~/.ssh/id_rsa.pub to ~/.ssh/authorized_keys file at remote_user@remote_server.com (couldn't scp the pub key as it says "permission denied")

Having done the above steps I tried to sftp from local_server to remote_server as follows:

Code:
 
[local_user@local_server.com]$  sftp remote_user@remote_server.com
remote_user@remote_server.com's password:

NOTE: The permission of ~/.ssh folder at remote server is 755 and that of authorized_keys is 600

It still is asking for password!! Smilie. Please help!!

-dips

Last edited by pludi; 09-06-2011 at 07:38 AM..
 

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SSH2_AUTH_PUBKEY_FILE(3)						 1						  SSH2_AUTH_PUBKEY_FILE(3)

ssh2_auth_pubkey_file - Authenticate using a public key

SYNOPSIS
bool ssh2_auth_pubkey_file (resource $session, string $username, string $pubkeyfile, string $privkeyfile, [string $passphrase]) DESCRIPTION
Authenticate using a public key read from a file. PARAMETERS
o $session - An SSH connection link identifier, obtained from a call to ssh2_connect(3). o $username - o $pubkeyfile - The public key file needs to be in OpenSSH's format. It should look something like: ssh-rsa AAAAB3NzaC1yc2EAAA....NX6sqSnHA8= rsa-key-20121110 o $privkeyfile - o $passphrase - If $privkeyfile is encrypted (which it should be), the $passphrase must be provided. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Authentication using a public key <?php $connection = ssh2_connect('shell.example.com', 22, array('hostkey'=>'ssh-rsa')); if (ssh2_auth_pubkey_file($connection, 'username', '/home/username/.ssh/id_rsa.pub', '/home/username/.ssh/id_rsa', 'secret')) { echo "Public Key Authentication Successful "; } else { die('Public Key Authentication Failed'); } ?> NOTES
Note The underlying libssh library doesn't support partial auths very cleanly That is, if you need to supply both a public key and a password it will appear as if this function has failed. In this particular case a failure from this call may just mean that auth hasn't been completed yet. You would need to ignore this failure and continue on and call ssh2_auth_password(3) in order to complete authentication. PHP Documentation Group SSH2_AUTH_PUBKEY_FILE(3)
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