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scp without prompting for password

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# 1  
Old 05-24-2011
scp without prompting for password
I am trying to copy a file from remote machine using scp. I followed the steps to configure public/private key usage. But still prompting for password when I do ssh.

I did the following steps to configure scp without asking password

Step 1 : local host
Code:
> ssh-keygen -t rsa

and when prompted for pass phrase I hit enter. Then id_rsa , id_rsa.pub files created in <usershome>/.ssh directory.

Step 2 : local host
Code:
> scp id_rsa.pub <remoteIP>:/tmp/mykey

, prompted for password as usual and provided password to copy.

Step 3 : Remote host
Code:
> cd ~/.ssh
cat /tmp/mykey >> authorized_keys2

step 4 : Remote host
Code:
> ln -s authorized_keys2 authorized_keys

step 5 : local host
Code:
> ssh -v <remote host>
Sun_SSH_1.1, SSH protocols 1.5/2.0, OpenSSL 0x0090704f
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Rhosts Authentication disabled, originating port will not be trusted.
debug1: ssh_connect: needpriv 0
debug1: Connecting to <remote host> [<remote host>] port 22.
debug1: Connection established.
debug1: identity file /home/users/sbob/.ssh/id_rsa.pub type 1
debug1: Remote protocol version 2.0, remote software version Sun_SSH_1.1
debug1: no match: Sun_SSH_1.1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-Sun_SSH_1.1
debug1: Failed to acquire GSS-API credentials for any mechanisms (No credentials were supplied, or the credentials were unavailable or inaccessible
Unknown code 0
)
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: Peer sent proposed langtags, ctos: i-default
debug1: Peer sent proposed langtags, stoc: i-default
debug1: We proposed langtags, ctos: i-default
debug1: We proposed langtags, stoc: i-default
debug1: Negotiated lang: i-default
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: Remote: Negotiated main locale: C
debug1: Remote: Negotiated messages locale: C
debug1: dh_gen_key: priv key bits set: 135/256
debug1: bits set: 1587/3191
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host '<remote host>' is known and matches the RSA host key.
debug1: Found key in /home/users/sbob/.ssh/known_hosts:1
debug1: bits set: 1548/3191
debug1: ssh_rsa_verify: signature correct
debug1: newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: done: ssh_kex2.
debug1: send SSH2_MSG_SERVICE_REQUEST
debug1: got SSH2_MSG_SERVICE_ACCEPT
debug1: Authentications that can continue: gssapi-keyex,gssapi-with-mic,publickey,password,keyboard-interactive
debug1: Next authentication method: gssapi-keyex
debug1: Next authentication method: gssapi-with-mic
debug1: Failed to acquire GSS-API credentials for any mechanisms (No credentials were supplied, or the credentials were unavailable or inaccessible
Unknown code 0
)
debug1: Next authentication method: publickey
debug1: Trying public key: /home/users/sbob/.ssh/id_rsa.pub
debug1: Authentications that can continue: gssapi-keyex,gssapi-with-mic,publickey,password,keyboard-interactive
debug1: Next authentication method: keyboard-interactive
Password:

still asking for password. what would be the reason?
Last edited by pludi; 05-24-2011 at 08:22 AM..
# 2  
Old 05-24-2011
Try a different public key method such as DSA, almost the same procedure, rinse and repeat until you have created a key for an agreed protocol

Code:

$ ssh-keygen -t dsa 
(accept the default for all queries)  
$ cat ~/.ssh/id_dsa.pub | ssh $REMOTE_HOST  "mkdir .ssh ; cat >>.ssh/authorized_keys" 
(enter your password)  
$ ssh $REMOTE_HOST echo 
$ssh $REMOTE_HOST
(should bring you over without keyboard interaction)

Last edited by Skrynesaver; 05-24-2011 at 08:31 AM.. Reason: removed accidental space in code.
# 3  
Old 05-24-2011
I got the same again. Again it is prompted for password. I followed the exact steps by removing space at . ssh to .ssh.
# 4  
Old 05-24-2011
And if you try with rsa1 publickey?
Code:
ssh-keygen -t rsa1

Assuming that you're talking to an old Sparc box that only does ssh version 1
# 5  
Old 05-24-2011
Can you check the permissions on ~.ssh, ~.ssh/authorized_keys2? SSH is quite picky about them. If in doubt, allow access only to the user, and remove all permissions for group and other.

By the way, a simpler way to install the public key is ssh-copy-id, which is part of OpenSSH.
# 6  
Old 05-24-2011
It didn't help. Any issue if the architecture differs, I am using solaris 10 sparc and solaris 10 X86 machines.
# 7  
Old 05-24-2011
Try running ssh agent to cache the pass phrase.
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