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Thread: visudo - allow webserver to run a command

  1. #1
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    Default visudo - allow webserver to run a command

    I need my webserver to run the /usr/sbin/smartctl command, how can I do this?

    I tried adding the line -

    %wwwrun ALL=/usr/sbin/smartctl

    to sudoers (through visudo), but it still doesn't run.

    Any ideas?

    Thanks
    HP dv6645, Nvidia 8400m-gs, KDE 4.

  2. #2
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    Default Re: visudo - allow webserver to run a command

    Hmm, I also tried chmod 755 /usr/sbin/smartctl and the following lines in sudoers -

    %www ALL=/usr/sbin/smartctl

    and then....

    www ALL=NOPASSWD:/usr/sbin/smartctl --all /dev/sda

    but still nothing!

    Do I need to reboot after changing sudoers?
    HP dv6645, Nvidia 8400m-gs, KDE 4.

  3. #3
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    Default Re: visudo - allow webserver to run a command

    There are some things I do not quite understand in your post. Maybe when they are a bit clearer we can carry on.

    To begin with in my system::
    Code:
    boven:~ # ls -l /usr/sbin/smartctl
    -rwxr-xr-x 1 root root 200548 Oct 10  2007 /usr/sbin/smartctl
    boven:~ #
    Was this not the case in your system that you changed it to this?

    The above means also that every user can execute this file. So why do you say wwwrun can not? (in other words, you did not provide us with any error message). I can:
    Code:
    henk@boven:~> /usr/sbin/smartctl -h
    smartctl version 5.37 [i686-suse-linux-gnu] Copyright (C) 2002-6 Bruce Allen
    Home page is http://smartmontools.sourceforge.net/
    
    Usage: smartctl [options] device
     ......
    I used man smartctl to see what it i supposed to do. It acts on a harddisk drive. It uses for this of course the device special files like /dev/sda. But these can only be read by root and users attached to group disk (when your system is not fouled up).
    Code:
    henk@boven:~> /usr/sbin/smartctl -i /dev/sda
    smartctl version 5.37 [i686-suse-linux-gnu] Copyright (C) 2002-6 Bruce Allen
    Home page is http://smartmontools.sourceforge.net/
    
    Smartctl open device: /dev/sda failed: Permission denied
    henk@boven:~>
    But as root:
    Code:
    smartctl version 5.37 [i686-suse-linux-gnu] Copyright (C) 2002-6 Bruce Allen
    Home page is http://smartmontools.sourceforge.net/
    
    === START OF INFORMATION SECTION ===
    Device Model:     Hitachi HDT725032VLA380
    Serial Number:    VFJ201R23XUEXW
    Firmware Version: V54OA7BA
    User Capacity:    320,072,933,376 bytes
    Device is:        Not in smartctl database [for details use: -P showall]
    ATA Version is:   7
    ATA Standard is:  ATA/ATAPI-7 T13 1532D revision 1
    Local Time is:    Mon Sep 14 15:18:24 2009 CEST
    SMART support is: Available - device has SMART capability.
    SMART support is: Enabled
    
    boven:~ #
    Now this last is what you already expected I suppose.

    Why not try this first with another user then wwwrun, so you can test in a normal terminal window if the call to smartctl works for this normal user?
    Henk van Velden

  4. #4
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    Default Re: visudo - allow webserver to run a command

    growbag wrote:
    > I need my webserver to run the -*/usr/sbin/smartctl*- command, how can I
    > do this?
    >
    > I tried adding the line -
    >
    > -*%wwwrun ALL=/usr/sbin/smartctl
    > *-
    > to sudoers (through visudo), but it still doesn't run.
    >
    > Any ideas?
    >
    > Thanks


    A lot of times, wwwrun does NOT have a shell. Try temporarily giving it a login shell and see if that fixes things. If it does, you'll have to
    decide if that's worth it or not.

  5. #5
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    Default Re: visudo - allow webserver to run a command

    Thanks for the replies.

    It was supposed to run from a php script, and the script gave no error output apart from the obscure - "Nothing found" message.

    But I gave up and simply used hddtemp instead, it seems much easier and gives me the necessary info.

    But thanks for taking the time to reply.
    HP dv6645, Nvidia 8400m-gs, KDE 4.

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