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Top Forums UNIX for Dummies Questions & Answers Passwordless SSH works, scp does not Post 302880288 by corrado33 on Wednesday 18th of December 2013 02:38:52 PM
Old 12-18-2013
Passwordless SSH works, scp does not

I know the "how to setup passwordless SSH" question is asked probably 5 times a week.

I know how to setup passwordless SSH, it's not tough, however after reinstalling linux on my server, I found a problem. I could SSH into my server just fine, no password required, however SCP still required a password. I fixed it by simply regenerating the keys on the client and deleting the authorized_keys files on the server, essentially re-doing the passwordless ssh setup.

What would cause SCP to require a password but not SSH? If I remember correctly, it was asking me for a password for the public key file (which you can input during the key generation phase.) But, if I accidently put a password on the public key, ssh should have required it as well, correct?

After a quick google search I found that in the authorized_keys file can actually allow certain services but not others? Is that true?

Again, I've fixed the problem, this question is pure curiosity.
 

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SSH-COPY-ID(1)						      General Commands Manual						    SSH-COPY-ID(1)

NAME
ssh-copy-id - install your public key in a remote machine's authorized_keys SYNOPSIS
ssh-copy-id [-i [identity_file]] [user@]machine DESCRIPTION
ssh-copy-id is a script that uses ssh to log into a remote machine (presumably using a login password, so password authentication should be enabled, unless you've done some clever use of multiple identities) It also changes the permissions of the remote user's home, ~/.ssh, and ~/.ssh/authorized_keys to remove group writability (which would oth- erwise prevent you from logging in, if the remote sshd has StrictModes set in its configuration). If the -i option is given then the identity file (defaults to ~/.ssh/id_rsa.pub) is used, regardless of whether there are any keys in your ssh-agent. Otherwise, if this: ssh-add -L provides any output, it uses that in preference to the identity file. If the -i option is used, or the ssh-add produced no output, then it uses the contents of the identity file. Once it has one or more fin- gerprints (by whatever means) it uses ssh to append them to ~/.ssh/authorized_keys on the remote machine (creating the file, and directory, if necessary) SEE ALSO
ssh(1), ssh-agent(1), sshd(8) OpenSSH 14 November 1999 SSH-COPY-ID(1)
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