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CentOS 5.6

There are two users; user A and user B. I have permissions for both and can log in as either.

I would like to be able to log in as user B, and somehow run commands as user A without knowing the password for user B.

I know this could be achieved in the sudoers file, but neither user has the ability to edit that. This is for a larger experiment, and for the sake of this question I do not have access to root (otherwise I could just log in as root and change the sudoers file accordingly).

Any ideas?

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set up a ssh key for user b, share the public key with user a

userb$   ssh-keygen -t dsa
userb$   scp ~/.ssh/id_dsa.pub usera@`hostname`:.ssh/authorized_keys2

you'll type a password here, but should be a 1 time thing. Then you can run commands on user a's account like so:

usera$   ssh userb@`hostname` command goes here
Example:  ssh userb@`hostname` ls -la ~
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When I run ssh userb@localhost i still get prompted for a password. I have copied the public key of userb to ~/.ssh/authorized_keys (apparently authorized_keys2 is outdated although I tried it as well). – speedreeder Oct 2 '11 at 16:51
2  
check the file permissions on your .ssh dir, sometimes, if your permissons are set to group or world readable, it won't accept it. – Roy Rico Oct 2 '11 at 21:49
1  
you can type ssh -v for more verbose diagnostic information during the connection, you can add more v's for more detail (i.e. ssh -vvv userb@localhost) – Roy Rico Oct 2 '11 at 21:50

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