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Thread: Help : Unable to authenticate su

  1. #11
    Join Date
    Jul 2008
    Location
    Sydney, Australia
    Beans
    89
    Distro
    Ubuntu 8.04 Hardy Heron

    Re: Help : Unable to authenticate su

    Quote Originally Posted by iaculallad View Post
    No, that's a windoze thing. Just log-off and log back in
    Hi again. I rebooted & still can't authenticate su. Result as below. Is there anything else I can try ? Thanks

    master@ubuntu-server:~$ cat /etc/hosts
    127.0.0.1 localhost
    127.0.1.1 ubuntu-server

    # The following lines are desirable for IPv6 capable hosts
    ::1 ip6-localhost ip6-loopback
    fe00::0 ip6-localnet
    ff00::0 ip6-mcastprefix
    ff02::1 ip6-allnodes
    ff02::2 ip6-allrouters
    ff02::3 ip6-allhosts

  2. #12
    Join Date
    Jul 2008
    Location
    Sydney, Australia
    Beans
    89
    Distro
    Ubuntu 8.04 Hardy Heron

    Re: Help : Unable to authenticate su

    Quote Originally Posted by Dreamerman View Post
    Hi again. I rebooted & still can't authenticate su. Result as below. Is there anything else I can try ? Thanks

    master@ubuntu-server:~$ cat /etc/hosts
    127.0.0.1 localhost
    127.0.1.1 ubuntu-server

    # The following lines are desirable for IPv6 capable hosts
    ::1 ip6-localhost ip6-loopback
    fe00::0 ip6-localnet
    ff00::0 ip6-mcastprefix
    ff02::1 ip6-allnodes
    ff02::2 ip6-allrouters
    ff02::3 ip6-allhosts
    This is another result. Still can't get into su.....sigh.....

    master@ubuntu-server:~$ cat /etc/hostname
    ubuntu-server

  3. #13
    Join Date
    Mar 2008
    Location
    California, USA
    Beans
    8,111

    Re: Help : Unable to authenticate su

    Did you try "sudo -i" again? Your original problem of it returning the error "sudo: unable to resolve host ubuntu-server" should be solved now that your host name is the same in /etc/hosts and /etc/hostname. That would at least give another clue about your problem.

  4. #14
    Join Date
    Mar 2008
    Location
    City of Pines
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    3,585

    Re: Help : Unable to authenticate su

    Or maybe you're entering the wrong password when invoking the su command. Remember that using su should require you to input the root password w/c by default is disabled in Ubuntu. Try setting the password for su first:

    Code:
    sudo passwd root
    Steady movement is more important than speed, much of the time. So long as there is a regular progression of Stimuli to get your mental hooks into, there is room for lateral movement. Once this begins, its rate is a matter of discretion.

  5. #15
    Join Date
    Mar 2008
    Location
    California, USA
    Beans
    8,111

    Re: Help : Unable to authenticate su

    Quote Originally Posted by iaculallad View Post
    Or maybe you're entering the wrong password when invoking the su command. Remember that using su should require you to input the root password w/c by default is disabled in Ubuntu. Try setting the password for su first:

    Code:
    sudo passwd root
    That's a good point, but I think we should respect Ubuntu's philosopy about the root account not encourage Dreamerman to set the root password. If he needs to get a root shell, he really should do it with "sudo -i" and not "su".

  6. #16
    Join Date
    Jul 2008
    Location
    Sydney, Australia
    Beans
    89
    Distro
    Ubuntu 8.04 Hardy Heron

    Re: Help : Unable to authenticate su

    Quote Originally Posted by caljohnsmith View Post
    Did you try "sudo -i" again? Your original problem of it returning the error "sudo: unable to resolve host ubuntu-server" should be solved now that your host name is the same in /etc/hosts and /etc/hostname. That would at least give another clue about your problem.
    Hi. Result as follows. Seems I can authenticate sudo but not su. Any ideas why ? Thanks

    master@ubuntu-server:~$ sudo -i
    [sudo] password for master:
    root@ubuntu-server:~# exit
    logout
    master@ubuntu-server:~$ su
    Password:
    su: Authentication failure
    master@ubuntu-server:~$

  7. #17
    Join Date
    Mar 2008
    Location
    City of Pines
    Beans
    3,585

    Re: Help : Unable to authenticate su

    Try this to resolve your SU problem: Drop on your terminal:

    Code:
    sudo -i
    and input your password. On your successful authentication, you should be dropped to the root terminal. Now, issue the command below:

    Code:
    chmod +s /bin/su
    and exit on the root terminal:

    Code:
    exit
    and test your su

    Code:
    su
    Steady movement is more important than speed, much of the time. So long as there is a regular progression of Stimuli to get your mental hooks into, there is room for lateral movement. Once this begins, its rate is a matter of discretion.

  8. #18
    Join Date
    Jul 2008
    Location
    Sydney, Australia
    Beans
    89
    Distro
    Ubuntu 8.04 Hardy Heron

    Re: Help : Unable to authenticate su

    Quote Originally Posted by iaculallad View Post
    Try this to resolve your SU problem: Drop on your terminal:

    Code:
    sudo -i
    and input your password. On your successful authentication, you should be dropped to the root terminal. Now, issue the command below:

    Code:
    chmod +s /bin/su
    and exit on the root terminal:

    Code:
    exit
    and test your su

    Code:
    su
    Hi. Tried your approach but still the same.

    master@ubuntu-server:~$ sudo -i
    [sudo] password for master:
    root@ubuntu-server:~# chmod +s /bin/su
    root@ubuntu-server:~# exit
    logout
    master@ubuntu-server:~$ su
    Password:
    su: Authentication failure
    master@ubuntu-server:~$

  9. #19
    Join Date
    Mar 2008
    Location
    City of Pines
    Beans
    3,585

    Re: Help : Unable to authenticate su

    Try setting the root password and unset it afterwards:

    Code:
    sudo passwd
    and input your password, then try running su

    If that still fails, Unset the root password:

    Code:
    sudo passwd -l root
    Steady movement is more important than speed, much of the time. So long as there is a regular progression of Stimuli to get your mental hooks into, there is room for lateral movement. Once this begins, its rate is a matter of discretion.

  10. #20
    Join Date
    Jul 2008
    Location
    Sydney, Australia
    Beans
    89
    Distro
    Ubuntu 8.04 Hardy Heron

    Re: Help : Unable to authenticate su

    Quote Originally Posted by iaculallad View Post
    Try setting the root password and unset it afterwards:

    Code:
    sudo passwd
    and input your password, then try running su

    If that still fails, Unset the root password:

    Code:
    sudo passwd -l root
    *HAIL THE MASTER* Thank you so very much

    master@ubuntu-server:~$ sudo passwd
    Enter new UNIX password:
    Retype new UNIX password:
    passwd: password updated successfully
    master@ubuntu-server:~$ su
    Password:
    root@ubuntu-server:/home/master#

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