Remote login fun & games

From: Michael Hopkins (michael.hopkins_at_hopkins-research.com)
Date: 08/17/05

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    Date: Wed, 17 Aug 2005 16:55:34 +0100

    Hi all

    After a few months of pain-free ssh remote login and NFS access between Mac
    OS X desktop and a FreeBSD server (FreeBSD Athlon 5.4-RELEASE-p6), things
    got a bit fraught recently when I:

    (1) installed Tiger on the OS X machine

    (2) tried to make a backup mirror of the FreeBSD boot disk

    Somewhere along the way, ssh stopped letting 'mwh' in as a user even though
    'root' was still accepted, I found a lot of my /etc/ files on the server had
    got set back to defaults and my automated backups had not been saving /etc/
    <- one BIG lesson learned for the future. I now have the hosts, hosts.allow
    & exports files back where they were and NFS is working again.

    Anyway.. I have been using ssh for remote login and running X apps remotely.
    This was working well but as the network is a trusted local one I thought it
    would be faster to use an unencrypted connection because I am doing some
    heavy graphics work on 100Mb network. I thought about rlogin & telnet.

    I have enabled these in inetd.conf

    telnet stream tcp nowait root /usr/libexec/telnetd telnetd
    shell stream tcp nowait root /usr/libexec/rshd rshd
    login stream tcp nowait root /usr/libexec/rlogind rlogind

    ...and inetd is running.

    Now if I rlogin under my user account 'mwh' it lets me in then IMMEDIATELY
    closes the connection after welcoming me etc:

    mwh@laptop ~ % rlogin mwh@Athlon
    Password:
    Last login: Wed Aug 17 16:42:14 from Laptop
    [snip MOTD]
    rlogin: connection closed.
    mwh@laptop ~ %

    ...and if I do the same for root..

    mwh@laptop ~ % rlogin root@Athlon
    Password:
    Login incorrect
    login:

    ..it doesn't recognise the root password.

    Telnet just hangs with both mwh & root...

    mwh@laptop ~ % telnet -l mwh Athlon
    ^C
    mwh@laptop ~ % telnet -l root Athlon
    ^C

    Any thoughts on why this should be happening? Where should I look to stop
    this behaviour? I don't know where to begin because as far as I know (I'm
    not an expert on Unix) everything is set up OK.

    Many thanks

    Michael

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