10-25-2011
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
host1 & host2 : Solaris 10 - SPARC server
From host1 able to ssh to host2 as same user with out password prompt. But, when ssh to different user in
host2, it prompts for password
DETAILS
=======
In host1:
1) logged as root
2) ssh-keygen -t dsa -b 1024 (no pass phrase)
3)... (5 Replies)
Discussion started by: vjkatsun
5 Replies
2. Shell Programming and Scripting
Hello everybody,
Say I forgot my root password (shit happens, no?) and I'd like to brutally try 100 possibilities to delete a file using sudo. How can I make a script that tries all the passwords?
The following doesn't work. Do you have a clue?
foo:~$ cat test
sudo rm dummy <<< 'password'
echo... (1 Reply)
Discussion started by: chebarbudo
1 Replies
3. AIX
Hello
I have a partition with Aix 5.3 and I install sudo
I put the commands that I want to use x user and I put the option that donkask for password.
But when I run with this user and I try to run that commands. ask me for a password.
I put this line for no ask for password with that... (2 Replies)
Discussion started by: lo-lp-kl
2 Replies
4. Red Hat
I setup the keys between 2 servers, but my user account has no password specified for it (never set one up on the account for security reasons). When I try to SSH to the server, SSH prompts for a password that doesn't exist (so I can never connect successfully).
Note: 'passwd -d Rynok' removes... (3 Replies)
Discussion started by: Rynok
3 Replies
5. UNIX for Dummies Questions & Answers
Hi! I'm very new to unix, so please keep that in mind with the level of language used if you choose to help :D Thanks!
When attempting to use sudo on and AIX machine with oslevel 5.1.0.0, I get the following error:
exec(): 0509-036 Cannot load program sudo because of the following errors:... (1 Reply)
Discussion started by: Chloe123
1 Replies
6. Shell Programming and Scripting
Hi
While doing the following command password is gettin dispalyed :
ssh <host> "sudo command ; exit"
....
while i type my password for 2nd its gettin displayed ...
i tried stty -echo and stty echo
...
still i am havin problem..:confused: (1 Reply)
Discussion started by: ningy
1 Replies
7. Red Hat
Little confused here
When i go to run sudo nohup ./script.ksh &
I dont get asked for a password.
It starts a process ID, I can see it when i do a ps -ef | grep script.
But I dont get an output file from my script, so its not doing anything.
What gives?
does it have to do the "&" ?
... (4 Replies)
Discussion started by: nitrobass24
4 Replies
8. Red Hat
I am not sure what I am missing here. I have the following identical entry in /etc/sudoers on multiple Red Hat 6.4 servers.
icinga ALL=NOPASSWD:/usr/bin/yum --security --exclude\="kernel*" check-update
On one server when I enter the command over SSH as follows it works fine.
ssh -t -q... (1 Reply)
Discussion started by: scotbuff
1 Replies
9. UNIX for Dummies Questions & Answers
I am trying to run a command. This is one of my attempts:
for i in fileservera; do ssh -t $i 'sudo ls /';doneThis works, and I see the directories. However, what I want to do now is start a process on the remote server such as /usr/bin/connectproc -standalonesudo /usr/bin/connectproc... (1 Reply)
Discussion started by: newbie2010
1 Replies
10. AIX
in the /etc/sudoer file this line was added:
wtolentino ALL=(ORACLE) NOPASSWD: /bin/chmod
when i tried to run this command
sudo -u oracle /bin/chmod 775 /appshared/applications/lpa/executables/chrpt001.rep
it prompts me for a password
for example:
$ pwd
/appshared/applications/lpa... (2 Replies)
Discussion started by: wtolentino
2 Replies
LEARN ABOUT LINUX
sudo_root
sudo_root(8) System Manager's Manual sudo_root(8)
NAME
sudo_root - How to run administrative commands
SYNOPSIS
sudo command
sudo -i
INTRODUCTION
By default, the password for the user "root" (the system administrator) is locked. This means you cannot login as root or use su. Instead,
the installer will set up sudo to allow the user that is created during install to run all administrative commands.
This means that in the terminal you can use sudo for commands that require root privileges. All programs in the menu will use a graphical
sudo to prompt for a password. When sudo asks for a password, it needs your password, this means that a root password is not needed.
To run a command which requires root privileges in a terminal, simply prepend sudo in front of it. To get an interactive root shell, use
sudo -i.
ALLOWING OTHER USERS TO RUN SUDO
By default, only the user who installed the system is permitted to run sudo. To add more administrators, i. e. users who can run sudo, you
have to add these users to the group 'admin' by doing one of the following steps:
* In a shell, do
sudo adduser username admin
* Use the graphical "Users & Groups" program in the "System settings" menu to add the new user to the admin group.
BENEFITS OF USING SUDO
The benefits of leaving root disabled by default include the following:
* Users do not have to remember an extra password, which they are likely to forget.
* The installer is able to ask fewer questions.
* It avoids the "I can do anything" interactive login by default - you will be prompted for a password before major changes can happen,
which should make you think about the consequences of what you are doing.
* Sudo adds a log entry of the command(s) run (in /var/log/auth.log).
* Every attacker trying to brute-force their way into your box will know it has an account named root and will try that first. What they do
not know is what the usernames of your other users are.
* Allows easy transfer for admin rights, in a short term or long term period, by adding and removing users from the admin group, while not
compromising the root account.
* sudo can be set up with a much more fine-grained security policy.
* On systems with more than one administrator using sudo avoids sharing a password amongst them.
DOWNSIDES OF USING SUDO
Although for desktops the benefits of using sudo are great, there are possible issues which need to be noted:
* Redirecting the output of commands run with sudo can be confusing at first. For instance consider
sudo ls > /root/somefile
will not work since it is the shell that tries to write to that file. You can use
ls | sudo tee /root/somefile
to get the behaviour you want.
* In a lot of office environments the ONLY local user on a system is root. All other users are imported using NSS techniques such as
nss-ldap. To setup a workstation, or fix it, in the case of a network failure where nss-ldap is broken, root is required. This tends to
leave the system unusable. An extra local user, or an enabled root password is needed here.
GOING BACK TO A TRADITIONAL ROOT ACCOUNT
This is not recommended!
To enable the root account (i.e. set a password) use:
sudo passwd root
Afterwards, edit the sudo configuration with sudo visudo and comment out the line
%admin ALL=(ALL) ALL
to disable sudo access to members of the admin group.
SEE ALSO
sudo(8), https://wiki.ubuntu.com/RootSudo
February 8, 2006 sudo_root(8)