[SOLVED] Command 'su -' works but 'sudo' gives error

info.latawaz · 06-20-2013, 02:33 PM

Hi,

I have set root password and I login to root with 'su -' and that password and it is successful. This i am doing from a user account that I am using for myself.

Now I am trying to simply type 'sudo' followed by the command and it asks for password. Entering root password shows

Quote:

'Sorry, try again'

. Instead of entering root password, if I enter the user account password, it says

Quote:

sudo: poweroff: command not found

I am trying to give a user, permission to execute poweroff command which is here: /sbin/poweroff

What should I do?

frieza · 06-20-2013, 02:50 PM

perhaps try

Code:

sudo shutdown -h now

yancek · 06-20-2013, 02:55 PM

Have you configured or enabled sudo on Slackware?

http://linuxg.net/how-to-install-and...-slackware-14/

Have you tried using the full path?

http://www.linuxquestions.org/questi...-found-792446/

suicidaleggroll · 06-20-2013, 03:02 PM

/sbin is typically not in the normal users' PATH. You can use the full path to it if you want, or you can add /sbin to the PATH, or you can use shutdown -h.

chrism01 · 06-20-2013, 06:33 PM

Show the sudoers file, but, as above, its always a good idea to specify the complete cmd path for privileged cmds.
BTW, with sudo cmd, its always the user's passwd, not root's (& vice versa for su obviously

)

frankbell · 06-20-2013, 06:44 PM

If I recall correctly, Slackware does not automatically configure the sudoers file. It does not share Ubuntu's sudo fetish.

To implement sudo, you will need to edit the sudoers file using the visudo command.

info.latawaz · 06-21-2013, 03:26 AM

I didn't know that sudo needs to be installed. But I followed the link and did what was asked. Finally got this message.

Quote:

root@localhost:~# slackpkg install sudo

Looking for sudo in package list. Please wait... DONE

No packages match the pattern for install. Try:

/usr/sbin/slackpkg reinstall|upgrade

After this, I added path /sbin to $PATH with this

Quote:

export PATH=$PATH:/sbin
echo $PATH
/usr/local/bin:/usr/bin:/bin:/usr/games:/usr/lib64/kde4/libexec:/usr/lib64/qt/bin:/usr/share/texmf/bin:.:/sbin

So it seems PATH /sbin has been added. Before that I had added below line to /etc/sudoer

Quote:

myuser localhost=/sbin/halt;/sbin/poweroff;/sbin/shutdown

After this, as myuser, I am doing this

Quote:

sudo poweroff
Password:
Sorry, user myuser is not allowed to execute '/sbin/poweroff' as root on localhost.

What am I missing?

jdkaye · 06-21-2013, 03:49 AM

Have you edited the sudoers file (usually /etc/sudoers). You need to add a line like this:
Before:

Code:

# User privilege specification
root    ALL=(ALL:ALL) ALL

After:

Code:

# User privilege specification
root    ALL=(ALL:ALL) ALL
myuser  ALL=(ALL:ALL) ALL

Or something like that.
jdk

chrism01 · 06-21-2013, 04:34 AM

No point in putting root in sudoers file; he/she already has total power

sudo entry should be comma-with-space separated see http://www.sudo.ws/sudo/sudoers.man.html.
Never use the keyword ALL if you can avoid it; always be specific.

jdkaye · 06-21-2013, 04:41 AM

Quote:

Originally Posted by chrism01

No point in putting root in sudoers file; he/she already has total power

sudo entry should be comma-with-space separated see http://www.sudo.ws/sudo/sudoers.man.html.
Never use the keyword ALL if you can avoid it; always be specific.

I didn't; Debian did. I haven't ever touched the sudoers file except to add my own userid. I don't do anything with root. Just use it as it comes out of the box.
ciao,
jdk

chetanbhasin · 06-21-2013, 10:35 AM

Do you have sudo installed?

If not, you can probably do that by logging into root and installing sudo with your preferred package manager.

P.S. You can also try removing and purging and then reinstalling sudo to check if it works this time.

info.latawaz · 06-21-2013, 01:32 PM

Sudo is installed

Code:

myuser@localhost:~$ sudo
usage: sudo [-D level] -h | -K | -k | -V
usage: sudo -v [-AknS] [-D level] [-g groupname|#gid] [-p prompt] [-u user name|#uid]
usage: sudo -l[l] [-AknS] [-D level] [-g groupname|#gid] [-p prompt] [-U user name] [-u user name|#uid] [-g groupname|#gid] [command]
usage: sudo [-AbEHknPS] [-C fd] [-D level] [-g groupname|#gid] [-p prompt] [-u user name|#uid] [-g groupname|#gid] [VAR=value] [-i|-s]
            [<command>]
usage: sudo -e [-AknS] [-C fd] [-D level] [-g groupname|#gid] [-p prompt] [-u user name|#uid] file ...

When I execute poweroff with full path, I get below output.

Code:

myuser@localhost:~$ sudo /sbin/poweroff
Password:
Sorry, user myuser is not allowed to execute '/sbin/poweroff' as root on localhost.

jdkaye · 06-21-2013, 11:23 PM

Did you edit the sudoers file as I suggested in post #8?
jdk

info.latawaz · 06-22-2013, 01:10 AM

Quote:

Originally Posted by jdkaye

Did you edit the sudoers file as I suggested in post #8?
jdk

Nope, I did not. I don't want to give complete permission to the user. Then there is no point in giving permission at all. I can just 'su -' and get my work done.

I am hoping for something more accurate like 'poweroff' and 'shutdown'. Ofcourse I can 'su -' and do the same but I am trying to do it differently.

But I have added the below line already in /etc/sudoers

Code:

myuser localhost=/sbin/halt;/sbin/poweroff;/sbin/shutdown

I says

Code:

'myuser' is not allowed to execute the execute '/sbin/poweroff' as root on local host

info.latawaz · 06-22-2013, 01:46 AM

I made changes in sudoers and this is what I did

Code:

myuser ALL=(ALL) /sbin/halt,/sbin/poweroff,/sbin/shutdown

I then executed 'sudo poweroff' and got 'Command not found'. I then executed 'sudo /sbin/poweroff' and it worked.

Now the only thing that is left is to remove /sbin, as in to use 'sudo poweroff'. I think adding path /sbin to $PATH should work. Right? If so, how and where do I add path?