{"id":471,"date":"2012-05-18T17:25:42","date_gmt":"2012-05-18T17:25:42","guid":{"rendered":"http:\/\/shivdev.com\/blog\/?p=471"},"modified":"2013-02-20T21:54:45","modified_gmt":"2013-02-20T21:54:45","slug":"ssh-keygen-to-ssh-without-using-passwords","status":"publish","type":"post","link":"http:\/\/shivdev.com\/blog\/2012\/05\/18\/ssh-keygen-to-ssh-without-using-passwords\/","title":{"rendered":"ssh-keygen to SSH without using passwords"},"content":{"rendered":"

The below example will demonstrate how shivdev<\/em>@sk-optiplex<\/strong> can SSH to shivdev<\/em>@sk-redhat<\/strong> without a password. The idea is to create SSH (public\/private) keys on sk-optiplex<\/strong> and then copy the public key \/home\/shivdev\/.ssh\/id_dsa.pub<\/em><\/strong> from sk-optiplex<\/strong> over to sk-redhat<\/strong> as .\/ssh\/authorized_keys2<\/em><\/strong>.<\/p>\n

I’m using SSH 2 with DSA encryption, because I just couldn’t get SSH with RSA encryption to work.<\/em><\/p>\n

shivdev@sk-optiplex:~$ ssh-keygen -t dsa<\/em><\/strong>
\nGenerating public\/private dsa key pair.
\nEnter file in which to save the key (\/home\/shivdev\/.ssh\/id_dsa):
\nEnter passphrase (empty for no passphrase):
\nEnter same passphrase again:
\nYour identification has been saved in \/home\/shivdev\/.ssh\/id_dsa.
\nYour public key has been saved in \/home\/shivdev\/.ssh\/id_dsa.pub.
\nThe key fingerprint is:
\n73:4a:b1:d3:d6:3c:fc:ed:c7:c6:61:18:0f:fb:06:6b shivdev@sk-optiplex
\nThe key’s randomart image is:
\n+–[ DSA 1024]—-+
\n| |
\n| |
\n| . |
\n| + + o |
\n| S + = * |
\n| . * * = |
\n| . *oo|
\n| E +=|
\n| . ..o|
\n+—————–+
\nshivdev@sk-optiplex:~$ scp \/home\/shivdev\/.ssh\/id_dsa.pub shivdev@sk-redhat:.ssh\/authorized_keys2<\/em><\/strong>
\nThe authenticity of host ‘sk-redhat (sk-redhat)’ can’t be established.
\nRSA key fingerprint is b4:3a:15:5d:cb:5d:7e:05:39:35:0d:9c:1f:d4:84:08.
\nAre you sure you want to continue connecting (yes\/no)? yes
\nFailed to add the host to the list of known hosts (\/home\/shivdev\/.ssh\/known_hosts).
\nshivdev@sk-redhat’s password: <\/strong>
\nid_dsa.pub 100% 610 0.6KB\/s 00:00
\nshivdev@sk-optiplex:~$ ssh shivdev@sk-redhat<\/em><\/strong>
\nThe authenticity of host ‘sk-redhat (sk-redhat)’ can’t be established.
\nRSA key fingerprint is b4:3a:15:5d:cb:5d:7e:05:39:35:0d:9c:1f:d4:84:08.
\nAre you sure you want to continue connecting (yes\/no)? yes
\nFailed to add the host to the list of known hosts (\/home\/shivdev\/.ssh\/known_hosts).
\nLast login: Thu May 17 14:48:01 2012 from 10.4.21.184
\n[shivdev@sk-redhat ~]$ <\/strong><\/p><\/blockquote>\n

As you can see after copying over the public key from shivdev<\/em>@sk-optiplex:.ssh\/id_dsa.pub<\/strong> over to shivdev<\/em>@sk-redhat:.ssh\/authorized_keys2<\/strong>, shivdev<\/em>@sk-optiplex<\/strong> is able to SSH into shivdev<\/em>@sk-redhat<\/strong> without a password.<\/p>\n

If you do get this error “Agent admitted failure to sign using the key.”, then you might need to run ssh-add<\/strong> or logout of the terminal and try to login again.<\/p>\n

\nshivdev@sk-optiplex:~$ ssh shivdev@sk-redhat
\nAgent admitted failure to sign using the key.<\/strong>
\nshivdev@sk_redhat’s password:<\/p>\n

shivdev@sk-optiplex:~$ ssh-add<\/em><\/strong><\/p>\n

shivdev@sk-optiplex:~$ ssh shivdev@sk-redhat
\nLast login: Thu May 17 14:51:01 2012 from 10.4.21.184
\n[shivdev@sk-redhat ~]$ <\/strong><\/p><\/blockquote>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"

The below example will demonstrate how shivdev@sk-optiplex can SSH to shivdev@sk-redhat without a password. The idea is to create SSH (public\/private) keys on sk-optiplex and then copy the public key \/home\/shivdev\/.ssh\/id_dsa.pub from sk-optiplex over to sk-redhat as .\/ssh\/authorized_keys2. I’m using SSH 2 with DSA encryption, because I just couldn’t get SSH with RSA encryption to […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[13,12],"tags":[],"_links":{"self":[{"href":"http:\/\/shivdev.com\/blog\/wp-json\/wp\/v2\/posts\/471"}],"collection":[{"href":"http:\/\/shivdev.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/shivdev.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/shivdev.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/shivdev.com\/blog\/wp-json\/wp\/v2\/comments?post=471"}],"version-history":[{"count":8,"href":"http:\/\/shivdev.com\/blog\/wp-json\/wp\/v2\/posts\/471\/revisions"}],"predecessor-version":[{"id":628,"href":"http:\/\/shivdev.com\/blog\/wp-json\/wp\/v2\/posts\/471\/revisions\/628"}],"wp:attachment":[{"href":"http:\/\/shivdev.com\/blog\/wp-json\/wp\/v2\/media?parent=471"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/shivdev.com\/blog\/wp-json\/wp\/v2\/categories?post=471"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/shivdev.com\/blog\/wp-json\/wp\/v2\/tags?post=471"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}