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Top Forums Shell Programming and Scripting How to restrict ssh by forced commands but sftp login should be enabled? Post 302762653 by Anil George on Tuesday 29th of January 2013 12:23:13 AM
Old 01-29-2013
My requirement is similar to the 'chroot jail', but not exactly the same.
I have to restrict the ssh-user to execute only one script(wrap_script.sh) and he should not be allowed to login via ssh to a remote server.

eg:-
Code:
ssh ssh-user@hostname wrap_scripts.sh

Once this script is executed, the control has to come back to the client system. The client system should be allowed to connect to the remote server using sftp and he should get the sftp prompt.

eg:-
Code:
sftp ssh-user@hostname
sftp>

The ssh-user should be only restricted if the connection has come through ssh from a particular client system. Else it should be a normal user.

That is the reason I thought of going for the forced commands in the authorization_keys file in the remote system. So when the connection is coming from that particular client, I should be able to restrict access to that. The ssh-user is a generic user that will be used by other client systems to connect to the remote server. But I need to restrict a particular host as mentioned above.
Thanks in advance. Could anyone please advice?

Last edited by Scrutinizer; 01-29-2013 at 02:27 AM.. Reason: code tags
 

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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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