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Thursday, April 21, 2011

ssh without password

xxxxxxxxxxxxxxxxxxxxx SSH Login Without Password By- Shirish Shukla xxxxxxxxxxxxxxxxxxxxxxx

Example: ssh from shirish@client-1  to shukla@server-1  without password
Server-1: 192.168.8.10               
Client-1: 192.168.8.20

#####ON Client-1: 192.168.8.20 : user  shirish
### Login as shirish

# ssh-keygen -t dsa
----------------------------------------------->> Just press Enter don't type anything

Generating public/private dsa key pair.
Enter file in which to save the key (/home/shirish/.ssh/id_dsa):  <--Enter
Created directory '/home/shirish/.ssh'.                                    
Enter passphrase (empty for no passphrase):                          <--Enter
Enter same passphrase again:                                               <--Enter
Your identification has been saved in /home/shirish/.ssh/id_dsa.
Your public key has been saved in /home/shirish/.ssh/id_dsa.pub.
The key fingerprint is:
d8:6c:cb:2a:e7:24:01:43:9f:96:4a:45:e6:93:9b:f4 shirish@my.scratch.com

# ssh-copy-id -i .ssh/id_dsa.pub shukla@192.168.8.10

The authenticity of host '192.168.8.10 (192.168.8.10)' can't be established.
RSA key fingerprint is e8:0b:8a:d3:1a:d1:ce:ec:d8:f9:13:31:79:c8:03:ed.
Are you sure you want to continue connecting (yes/no)?  yes                        <--type yes
Warning: Permanently added '192.168.8.10' (RSA) to the list of known hosts.

Password:                                <-- type password of shukla on Server-1: 192.168.8.10               

Now try logging into the machine, with "ssh 'shukla@192.168.8.10'", and check in:

  .ssh/authorized_keys

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

#####ON Server-1: 192.168.8.10
### Login as shukla  and confirm following

1> permission of /home/shukla/.ssh    700
$ ls -lrthd .ssh/
drwx------ 2 shukla shukla 4.0K Mar 12 13:51 .ssh/

2> permission of /home/shukla/.ssh/authorized_keys    600
$ ls -lrth .ssh/
-rw------- 1 shukla shukla 614 Mar 12 13:51 authorized_keys

########### Now login as shirish on Client-1:192.168.8.20
## ssh shukla@192.168.8.10
------------------------------------------------------>> It will not prompt for password

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2 comments:

  1. You would be better off to use a passphrase on the key and use ssh-agent to negotiate the use of the key. Without a passphrase, anyone who has access to your key can obtain access to your servers.

    ReplyDelete
  2. Yes we can do so, I recommend above for internal local server to perform any internal activity like rsync and so...


    -------> Shirish Shukla

    ReplyDelete

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