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Special Forums UNIX and Linux Applications SSH: Avoiding password prompt with rsa key generation Post 302220440 by same1290 on Thursday 31st of July 2008 05:50:15 PM
Old 07-31-2008
SSH: Avoiding password prompt with rsa key generation

Hi,

I am using a remote storage service for backing up our data - we want to have a script run as part of a cron job which would do the backups from our local Linux machine to the service's Linux machine.

I want to use tar and ssh to do this (rather than mounting the disk and using cp) . Therefore want to learn how to avoid having to type in a password with ssh. I am new to this feature so I went online and read the procedure, downloaded and built OpenSSH and did the following:

$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/homes/12/same/.ssh/id_rsa):
/homes/12/same/.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 /homes/12/same/.ssh/id_rsa.
Your public key has been saved in /homes/12/same/.ssh/id_rsa.pub.
The key fingerprint is:
27:a4:d4:63:35:62: ... same@dpdw

$ ssh-copy-id -i ~/.ssh/id_dsa.pub test3@remote.machine
test3@remote.machine''s password:
Now try logging into the machine, with "ssh 'test3@remote.machine'", and check in:

.ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

So at this point I'm expecting to be able to ssh into the remote machine and not be prompted for a password. Is this what should happen? As can be below seen I'm still prompted.

$ ssh 'test3@remote.machine'
test3@remote.machine's password:

Can someone please suggest a possible problem with what I'm doing that's preventing this from working?

Thanks in advance,
Sam
 

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SSH-ADD(1)						    BSD General Commands Manual 						SSH-ADD(1)

NAME
ssh-add -- adds RSA or DSA identities to the authentication agent SYNOPSIS
ssh-add [-lLdDxX] [-t life] [file ...] ssh-add -s reader ssh-add -e reader DESCRIPTION
ssh-add adds RSA or DSA identities to the authentication agent, ssh-agent(1). When run without arguments, it adds the files $HOME/.ssh/id_rsa, $HOME/.ssh/id_dsa and $HOME/.ssh/identity. Alternative file names can be given on the command line. If any file requires a passphrase, ssh-add asks for the passphrase from the user. The passphrase is read from the user's tty. ssh-add retries the last passphrase if multiple identity files are given. The authentication agent must be running and must be an ancestor of the current process for ssh-add to work. The options are as follows: -l Lists fingerprints of all identities currently represented by the agent. -L Lists public key parameters of all identities currently represented by the agent. -d Instead of adding the identity, removes the identity from the agent. -D Deletes all identities from the agent. -x Lock the agent with a password. -X Unlock the agent. -t life Set a maximum lifetime when adding identities to an agent. The lifetime may be specified in seconds or in a time format specified in sshd(8). -s reader Add key in smartcard reader. -e reader Remove key in smartcard reader. FILES
$HOME/.ssh/identity Contains the protocol version 1 RSA authentication identity of the user. $HOME/.ssh/id_dsa Contains the protocol version 2 DSA authentication identity of the user. $HOME/.ssh/id_rsa Contains the protocol version 2 RSA authentication identity of the user. Identity files should not be readable by anyone but the user. Note that ssh-add ignores identity files if they are accessible by others. ENVIRONMENT
DISPLAY and SSH_ASKPASS If ssh-add needs a passphrase, it will read the passphrase from the current terminal if it was run from a terminal. If ssh-add does not have a terminal associated with it but DISPLAY and SSH_ASKPASS are set, it will execute the program specified by SSH_ASKPASS and open an X11 window to read the passphrase. This is particularly useful when calling ssh-add from a .Xsession or related script. (Note that on some machines it may be necessary to redirect the input from /dev/null to make this work.) SSH_AUTH_SOCK Identifies the path of a unix-domain socket used to communicate with the agent. DIAGNOSTICS
Exit status is 0 on success, 1 if the specified command fails, and 2 if ssh-add is unable to contact the authentication agent. AUTHORS
OpenSSH is a derivative of the original and free ssh 1.2.12 release by Tatu Ylonen. Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos, Theo de Raadt and Dug Song removed many bugs, re-added newer features and created OpenSSH. Markus Friedl contributed the support for SSH protocol versions 1.5 and 2.0. SEE ALSO
ssh(1), ssh-agent(1), ssh-keygen(1), sshd(8) BSD
September 25, 1999 BSD
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