entering without root password

shanecaldeiro · 05-29-2009, 08:29 AM

I am using ubuntu and the testing server is fedora I would like to ssh it from a client system without asking a root password. How?

ncsuapex · 05-29-2009, 08:34 AM

ssh keys

http://www.linuxquestions.org/linux/...ation_with_ssh

shanecaldeiro · 05-29-2009, 09:09 AM

Quote:

Originally Posted by ncsuapex

ssh keys

http://www.linuxquestions.org/linux/...ation_with_ssh

Copy the public key to the server (you will need to enter the password):
cat ~/.ssh/id_dsa.pub | ssh user@server "cat - >> ~/.ssh/authorized_keys"

please explain

druuna · 05-29-2009, 09:17 AM

Hi,

What is unclear? The link given explains it all pretty good.

One other thing: You are talking about the root password. Most distro's configure ssh so to not allow root to use ssh (which is a good thing!!). Is the password actually asked or are you not able to use ssh as root user?

ermoreno · 05-29-2009, 09:18 AM

put /etc/ssh/ssh_host_rsa_key.pub from the remote server in the authorized_keys file on the local host. Then ssh with the -i switch and the path for the identity file. As long as the permissions are correct for .ssh and the underlying files are correct and the PermitRootLogin line of sshd_config is set to yes you should be good.

ssh -i /etc/ssh/ssh_host_rsa_key root@remotehost

shanecaldeiro · 05-29-2009, 09:28 AM

Quote:

Originally Posted by druuna

Hi,

What is unclear? The link given explains it all pretty good.

One other thing: You are talking about the root password. Most distro's configure ssh so to not allow root to use ssh (which is a good thing!!). Is the password actually asked or are you not able to use ssh as root user?

Actually i am new to linux. I have ran ssh-keygen -t dsa but cant understand what to do after that.

if i run
cat ~/.ssh/id_dsa.pub | ssh user@server "cat - >> ~/.ssh/authorized_keys"

the error is
cat: /home/shane/.ssh/id_dsa.pub: No such file or directory
root@192.168.129.108's password:

druuna · 05-29-2009, 09:41 AM

Hi,

The ssh-keygen command (if done correctly) should have created some files in your ~/.ssh directory......

What shows up when you do the following: ls -la ~/.ssh/

shanecaldeiro · 05-29-2009, 09:43 AM

Quote:

Originally Posted by druuna

Hi,

The ssh-keygen command (if done correctly) should have created some files in your ~/.ssh directory......

What shows up when you do the following: ls -la ~/.ssh/

total 12
drwx------ 2 shane shane 4096 2009-05-29 19:04 .
drwxr-xr-x 36 shane shane 4096 2009-05-29 20:02 ..
-rw-r--r-- 1 shane shane 442 2009-05-29 19:04 known_hosts

druuna · 05-29-2009, 09:52 AM

Hi,

The ssh-keygen command wasn't executed correctly (or you gave the wrong input).

Code:

cd ~/.ssh
ssh-keygen -t dsa

Enter file in which to save the key (/home/user/.ssh/id_dsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/user/.ssh/id_dsa.
Your public key has been saved in /home/user/.ssh/id_dsa.pub.
The key fingerprint is:
5c:2c:a0:4b:5c:83:31:9f:26:b1:41:8b:f0:6f:5e:99 user@exile

After you start the ssh-keygen -t dsa command you do not have to enter anything, just press enter/return until the normal prompt returns.

If all goes well there should be (at least) 2 files in your .ssh directory: id_dsa and id_dsa.pub

Hope this helps.