SSH Advanced Techniques

    Date09 Jan 2003
    3513
    Posted ByAnthony Pell
    In his regular security column, Bill introduces some advanced techniques for ssh: tunneling through an ssh gateway, running a command on multiple systems at once, and the easy way to install ssh keys. . . In his regular security column, Bill introduces some advanced techniques for ssh: tunneling through an ssh gateway, running a command on multiple systems at once, and the easy way to install ssh keys.

    At one site where I provide technical assistance, access to the network is all done via ssh over the Internet. However, one can't get access to the machines directly; one must first make an ssh connection to a gateway box I'll call martha. martha doesn't allow one to use regular passwords or keys, though. We're all given a one-time password devices the size of a credit card. When we ssh to martha, it asks us for our one-time password. The card displays a random password which we then type into the martha's password prompt. At that point we're into the system.

    As the name implies, the one-time password we get from our cards can only be used once. If I tried to use that password again, martha would not let me in. This protects me from someone looking over my shoulder as I log in and trying to use that same password to get in a few minutes later.

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