WinSCP access to SUDO user

Benefits of using sudo

Background Information
Apparently, the root user is excluded by default, and cannot be used to login through the Gnome graphical login - which is a very good thing! Tue Oct 4 I am at sudo users hoem directory. If "root" access is permitted ask you administrator: Feedback I have tried the above in an Ubuntu OS.

Using sudo

What is sudoer's file? Microsoft SQL Server 1. Solutions Learn More Through Courses. Experts Exchange Solution brought to you by Enjoy your complimentary solution view. Get every solution instantly with Premium.

Start your 7-day free trial. I wear a lot of hats If it's not "root" you will not be able to have simultaneous access to the multiple home directories.

If "root" access is permitted ask you administrator: On the remote server, and as root type: If your administrator will not permit "root" access to the server, have a line for the other account stuck in the sudoers file: Experts Exchange Solution brought to you by Your issues matter to us. It's more than this solution. Get answers and train to solve all your tech problems - anytime, anywhere.

Try it for free Edge Out The Competition for your dream job with proven skills and certifications. Get started today Stand Out as the employee with proven skills. Start learning today for free Move Your Career Forward with certification training in the latest technologies. Start your trial today. File Sharing Software From novice to tech pro — start learning today. Let's change "jim" a bit by adding this line:. This changes three things. First, "jim" needs root's password to run sudo because of "runaspw".

After that, it will not be forgotten, even if he logs out. Different users can, of course, have different defaults.

Here I've changed "jim", and added a new user "linda". Jim and Linda have different defaults. A "Default" not followed by a ": Now let's add some logging. Without doing anything special, sudo logs authentication failures to syslog, but by adding another default, we can track every command run:. Notice that this time there is no ": This default therefore applies to everyone.

With this in place, all sudo commands will be logged:. There's a limitation though:. That makes perfect sense: You might at this point suddenly think "Oh no- that means a sudo user could overwrite important files". We haven't limited the sudo users command set yet, but even if we do, what stops them from using such commands to pervert system files or other commands?

If the redirection can't be done because of permissions, the command will fail. So that's one thing you don't need to worry about. Actually, sudo itself makes reasonable efforts to protect you from malicious michief by a sudo user.

Running "sudo -V" as root shows sudo's settings; part of that is environment variables that it will not pass on or that it will check for dangerous content:. Note that if you do add or subtract variables, "sudo -V" doesn't reflect those changes. Let's try that out with our test user. First, we need a simple shell script that will show us the value of environment variables. I'll call it "showme":.

We'll have "jim" try it out before making any changes to sudoers:. The ENV variable is not picked up by sudo even though it was marked for export. Ordinarily, environment variables would be passed:.

But we can add to the list of variables to discard:. Now "jim" won't get BOOP in his sudo environment. Sudo also rearranges your PATH internally. That can be a little confusing:. Although PATH still shows ". Internally sudo has ignored the leading ". There's more that sudo does to protect tyou from malicious mischief.

Let's continue with our examples; it's time to limit "jim" to specific commands. There are two ways to do that. We can specifically list commands, or we can say that jim can only run commands in a certain directory.

A combination of those methods is useful:. The careful reader will note that there was a bit of a change here. Reading the man page can easily leave you quite confused as to what those three "ALL"'s meant. In the example above, ALL refers to machines- the assumption is that this is a network wide sudoers file.

In the case of this machine lnxserve we could do this:. So what was the " ALL " for? Well, here;s a clue:. That says that jim can using "sudo -u " run commands as paul or linda.

This is perfect for giving jim the power to kill paul or linda's processes without giving him anything else. There is one thing we need to add though: I hope that this introduction will get you started. Now that you have the basics, the man pages for sudo and sudoers should make more sense. Got something to add? Have you tried Searching this site? It contains technical articles about Unix, Linux and general computing related subjects, opinion, news, help files, how-to's, tutorials and more.

As soon as an Analytical Engine exists, it will necessarily guide the future course of the science. Whenever any result is sought by its aid, the question will then arise — by what course of calculation can these results be arrived at by the machine in the shortest time?

Home Linux Contact Site Map. Using sudo Learn to use Linux "sudo" for more security. Inexpensive and informative Apple related e-books: It wud be better if the Security part regarding environmental variables part is more elaborated Anyway, thanks for the article as it was useful for me, beginner Tue Mar 29 From the man page: But also from the man page: It is generally not effective to "subtract" commands from ALL using the!

A user can trivially circumvent this by copying the desired command to a different name and then executing that. Therefore, these kind of restrictions should be considered advisory at best and rein- forced by policy. So if I understand correctly, there is no effective way of subtractinga list of commands? Thu Jan 26 I was actually trying to configure sudo last night for the first time and got kinda lost with the man pages. Then I found your article and now I can at least configure the sudoers file and test some users capabilities.

I am trying to find a solution for my programmers where I don't have to give them the root password as they frequently need to su as another user on the system to troubleshoot their issues. So after going through various newsgroups, it seemed like sudo would be able to accomplish this. Is this assumption correct? Thanks for your help! They just do sudo su - Nothing more. Or "sudo command" if you've only given them access to specific commands.

I'm assuming they want to be root - if it is some other user, then yes, sudo "su -" username would be it Sun Jan 29 How come there are some files owned by user "" and some owned by root in my SUDO directory? Mon Jan 30 You don't have a user with that id. That's not at all unusual and nothing to be concerned about, though you may want to change these just so it doesn't bite you if you ever do add a user and use that id. But I want to restrict user1 to su to root. They can su to other users but I don't want them to su to root.

Is there a way to do this? Mon Oct 9 Just what I needed. Though the one liner text boxes are a little irritating to scroll and read through. See link for WHY we have those. Mon Dec 4 Was really helful How can I configure sudo so that it will be able to monitor all activities performed by the pseudo administrators and report on any discrepancies. Cheers Mon Dec 4 If you don't want to let someone use a particular command, then configure it so. Wed Mar 7 Permission Denied Starting httpd: This could get pretty complicated..

I think I'd use a setuid wrapper instead.. Wed Jun 20 Is this possible to somehow set a command prompt when working with sudo? Probably - can't think about it right now.. Wed Aug 15 Fri Jan 4 I have one qustion: How can I do so, that userA give permissions to userB to execute some commands, without userA to have access on the permissions on the another users C,D Look at the examples.

Thu Jan 10 Sun Jan 27 I get this answer; visudo: Permission denied, Do you have a solution for this? If i use sudo ill get the setuid as you now. If i try su it ask for password, i have tried everything and nothing worked. Im totally locked out, can't even fix my internet connection. See link Sun Jan 27 The problem started with a chown command i guess, don't remember exactly what i did wrong. I'm i root anyway? If so how to fix that? Ps sorry about the dubbel posting above Ds Sun Jan 27 Maybe its time for a reinstall?

Rgds Sun Jan 27 Wed Mar 26 Fri Jul 4 Sat Jul 5 Keep the articles coming: Tue Sep 8 I can understand the meaning of all the ALLs now: Tue Oct 13 Tue Nov 3 Regards Omar Sattar Tue Mar 2 You just saved me from spending the rest of the afternoon trying to make sense of the man page. Sat Jul 10 When it runs unix command it ask for password and always I have to provide it manually.

Is there any way I can provide it dynamically? Thu Aug 5 I am able to stop the service using the sudo command from nagios user. But when i try stopping the service from remote nagios server.

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Feb 22,  · Note: For help with configuring sudo privileges via its configuration file /etc/sudoers, please see Sudoers.. Background Information. In Linux (and Unix in general), there is a SuperUser named Windows equivalent of root is the Administrators group. I have a sudo user account in my system. We use it to carry on common operations. More than one user has sudo user privilleges. To access sudo user what i do is 1. Putty - . When I run sudo as a normal unprivileged user, it asks for my password, not the root password. That's often convenient, but it reduces the amount of information someone would have to have in order.