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$Id: howto-ssh-with-rsa-keys-(passwordless-login).txt,v 1.2 2003/03/20 05:57:31 joko Exp $ |
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$Log: howto-ssh-with-rsa-keys-(passwordless-login).txt,v $ |
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Revision 1.2 2003/03/20 05:57:31 joko |
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updated |
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Revision 1.1.1.1 2002/02/11 01:22:17 cvsjoko |
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first checkin' |
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1. local machine (e.g.: your laptop) (want to login to remote one) |
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THIS METHOD IS a) CLUMSY AND b) DANGEROUS!!! |
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PLEASE USE METHOD 2. TO DO THIS! |
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- check if you can login to the remote machine |
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via "normal" password authentication: |
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- ssh <username>@<remote_machine> |
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- create keys: |
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- rsa-keys: ssh-keygen |
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- dsa-keys: ssh-keygen -d |
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- create authorized_keys: |
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- cd ~/.ssh/ |
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- rsa-keys: cat identity.pub >> authorized_keys |
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- dsa-keys: cat id_dsa.pub >> authorized_keys |
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- take care of proper file-permissions |
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- chmod -R og-rwx ~/.ssh |
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- authorize remote machines / distribute "authorized_keys" |
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- scp authorized_keys <username>@<remote_machine>:~/.ssh/ |
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this is dangerous!!! it will overwrite the "authorized_keys" file completely |
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- test login to remote machine |
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- ssh <remote_machine> |
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2. remote machine (e.g.: a backup server) (want to login to this one) |
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which is machine is what? |
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<worker> the machine you are working on |
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<remote> the machine you want to log in |
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which account is what? |
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<service> is the account on <worker> (this one might execute some cronjobs) |
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<joko_backup> is the account on <remote> |
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[key generation] one-time preparations needed for <worker>: |
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x useradd service |
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x su service |
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x ssh-keygen -d |
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[key distribution] to be executed on <remote>: |
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x useradd joko_backup |
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x su joko_backup |
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x ssh service@<worker> "cat ~/.ssh/id_dsa.pub" >> ~/.ssh/authorized_keys |
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the (") with the first (remote) command are important! |
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otherwise your *local* shell would expand the tilde (~) |
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[key distribution] to be executed on <worker>: |
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This is an alternative to above if the account on <remote> already exists, |
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and it is somehow required not to execute commands |
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actively/manually at the <remote> side. Picture this: "the worker works". |
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#> cat ~/.ssh/id_dsa.pub | ssh joko@netfrag.org "cat - >> ~/.ssh/authorized_keys" |
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#> cat ~/.ssh/id_dsa.pub | ssh joko@gharb.tune.sytes.net "cat - >> ~/.ssh/authorized_keys" |
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If the account at remote side doesn't exists, |
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this shortcut might create it from the <worker> side as well: |
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x ssh root@<remote> "useradd joko_backup" |
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[login] test it on <worker>: |
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x su service |
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x ssh joko_backup@<remote-machine> |
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------------------------------------------ |
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annotiations |
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------------------------------------------ |
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- transfer files via ZMODEM-protocol and TeraTerm |
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- on remote machine |
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- sz <file1> <file2> <fileX> |
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- in TeraTerm, do |
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- File/Change Directory ... |
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- File/Transfer/ZMODEM/Recieve |
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