{"id":51,"date":"2009-10-05T13:10:54","date_gmt":"2009-10-05T11:10:54","guid":{"rendered":"http:\/\/www.stracca.net\/blog\/?p=51"},"modified":"2015-03-17T04:11:34","modified_gmt":"2015-03-17T03:11:34","slug":"ssh-without-a-password","status":"publish","type":"post","link":"https:\/\/blog.stracca.net\/?p=51","title":{"rendered":"SSH Without a Password"},"content":{"rendered":"

In order to connect through ssh beetween linux hosts without prompting password you need to store the RSA Keys.<\/p>\n

First log in on SERVERA as user USERA and generate a pair of authentication keys. Do not enter a passphrase:<\/p>\n

usera@SERVERA:~> ssh-keygen -t rsa<\/b> Generating public\/private rsa key pair. Enter file in which to save the key (\/home\/usera\/.ssh\/id_rsa):<\/pre>\n
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 Created directory '\/home\/usera\/.ssh'. Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in \/home\/usera\/.ssh\/id_rsa. Your public key has been saved in \/home\/usera\/.ssh\/id_rsa.pub. The key fingerprint is: 4a:4a:79:12:1b:2a:9f:3d:7c:be:f9:43:56:cb:24:e1 usera@SERVERA<\/pre>\n
Now use ssh<\/tt> to create a directory<\/p>\n
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~\/.ssh<\/tt> as user userb on SERVERB. (The directory may already exist, which is fine):<\/p>\n
usera@SERVERA:~> ssh userb@SERVERB mkdir -p .ssh<\/b> userb@SERVERB's<\/pre>\n
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 password:<\/pre>\n
Finally append usera's new public key to userb@SERVERB:.ssh\/authorized_keys<\/tt> and enter userb's password for the last<\/p>\n
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time:<\/p>\n
usera@SERVERA:~> cat .ssh\/id_rsa.pub | ssh userb@SERVERB \"cat - >> .ssh\/authorized_keys\"<\/b> userb@SERVERB's password:<\/pre>\n
From now on you can log into B as b from A as a without password:<\/p>\n
usera@SERVERA:~> ssh userb@SERVERB hostname<\/b> SERVERB<\/pre>\n
In some Linux version (it depends on SSH version) you had to:<\/p>\n
    \n
  • Put the public key in .ssh\/authorized_keys2<\/tt><\/li>\n
  • Change the permissions of .ssh<\/tt> to 700<\/li>\n
  • Change the permissions of .ssh\/authorized_keys2<\/tt> to 640<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
    In order to connect through ssh beetween linux hosts without prompting password you need to store the RSA Keys. First log in on SERVERA as user USERA and generate a pair of authentication keys. Do not enter a passphrase: usera@SERVERA:~> ssh-keygen -t rsa Generating public\/private rsa key pair. Enter file in which to save the […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[11,12],"class_list":["post-51","post","type-post","status-publish","format-standard","hentry","category-nix","tag-linux","tag-ssh"],"_links":{"self":[{"href":"https:\/\/blog.stracca.net\/index.php?rest_route=\/wp\/v2\/posts\/51","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.stracca.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.stracca.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.stracca.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.stracca.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=51"}],"version-history":[{"count":24,"href":"https:\/\/blog.stracca.net\/index.php?rest_route=\/wp\/v2\/posts\/51\/revisions"}],"predecessor-version":[{"id":408,"href":"https:\/\/blog.stracca.net\/index.php?rest_route=\/wp\/v2\/posts\/51\/revisions\/408"}],"wp:attachment":[{"href":"https:\/\/blog.stracca.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=51"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.stracca.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=51"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.stracca.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=51"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}