04-21-2010
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Hi,
When I try to run a script with ". "(dot space) in my home, it gives me error ".: Permission denied".
Any explanation for this behaviour?
Thanks in advance,
-Ashish (3 Replies)
Discussion started by: shriashishpatil
3 Replies
2. UNIX for Advanced & Expert Users
guest@ulidtko:~$ id
uid=126(guest) gid=134(guest) groups=134(guest)
guest@ulidtko:~$ ls -ld /home
drwxr-xr-x 8 root root 4096 May 12 19:47 /home
guest@ulidtko:~$ ls -l /home
ls: cannot open directory /home: Permission denied
guest@ulidtko:~$ cat /proc/mounts
rootfs / rootfs rw 0 0... (4 Replies)
Discussion started by: ulidtko
4 Replies
3. OS X (Apple)
Hi,
I have two machines 1. MacOSx (Users --> userMac , IP - a.b.c.d)
2. FreeBSD (Users --> userBSD, IP- p.q.r.s)
I want to modify some files of FreeBSD on my MacOS. So, I mounted the FreeBSD folder on my Mac as follows.
$ sudo mount -o -P p.q.r.s:/usr/home/user... (5 Replies)
Discussion started by: akash.mahakode
5 Replies
4. Solaris
Let me preface with I am semi-new to Solaris. I work with it in the labs at work and that's about my extent (although I run Linux at home).
Well, a week ago security comes around with updated requirements, some of which are the need to audit all failures. For the life of me I cannot get a... (0 Replies)
Discussion started by: mph275
0 Replies
5. Red Hat
I have a user who has "+ +" at the top of his .rhosts file. He cannot "rsh NODE date" to a different box ( both are RHEL 5.4 ). If I remove the "+ +" then the "RSH" works. I have correct settings of node names/user in the .rhosts file.
I even tried adding to the second box's... (3 Replies)
Discussion started by: rom828
3 Replies
6. Linux
Hello friends,
I have scratched my system and after that when I am trying to access the console via root login it's failing with an error message of "permission denied". I am able to access the other login, I am having only problem with root and some other user login. I am using an telnet... (2 Replies)
Discussion started by: sanoop
2 Replies
7. UNIX for Advanced & Expert Users
Hello friends,
I have scratched my system and after that when I am trying to access the console via root login it's failing with an error message of "permission denied". I am able to access the other login, I am having only problem with root and some other user login. I am using an telnet... (7 Replies)
Discussion started by: sanoop
7 Replies
8. Solaris
hello everyone,
I am new on unix systems. I am working with a Solaris 10 OS.
When i try to change netmask on certain interface:
I get:
How can i enable permission for changing that ? I have administrator privileges.
Your help is much appreciated.
thanks, (13 Replies)
Discussion started by: pablod76
13 Replies
9. AIX
Hello,
I tried to connect with root or any other user to AIX using ssh. It throws me error like Permission denied (publickey,keyboard-interactive). i don't know why!!
and the PermitRootLogin is yes
any help will be appreciated
Thanks (7 Replies)
Discussion started by: moudmm
7 Replies
10. OS X (Apple)
Hi,
I hope this is the correct section in the forum to post as I'm trying to SSH from my MacBook.
I was looking to see whether ssh on my jailbroken iPhone 6s (10.3.1) still works fine and was following this old reddit guide. I installed OpenSSH&OpenSSL from Cydia and changed the password using... (7 Replies)
Discussion started by: hss1
7 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)