Ap sample prompt

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Ap sample prompt

Using sudo Learn to use Linux "sudo" for more security. Most systems have some way of letting ordinary users perform certain tasks as root or some other privileged user.

SCO Open Server has "asroot" and can also directly assign "authorizations" such as backup privileges or being able to change other user's passwords. Many other Unixes, and Linux, use "sudo". I'm sure that there are more poorly written man pages, but "man sudoers" is among my all time favorites for obfuscation and poor explanation.

The creation of the file and the actual use of sudo isn't all that bad though. First a little background. The sudo program itself is a setuid binary. If you examine its permissions, you will see: You and everyone else have execute permission on this, so you can run it.

When you do that, because it is setuid and owned by root, your effective user id becomes root- if you could get to a shell from sudo, you effectively WOULD be root- you could remove any file on Ap sample prompt system, etc. That's why setuid programs have to be carefully written, and something like sudo which is going to allow access to other programs has to be especially careful.

A setuid program doesn't necessarily mean root access. A setuid program owned by a different user would give you that user's effective id. The sudo program can also change your effective id while it is running- I'll be showing an example of that here. Those are entirely different concepts and I won't be talking about those things in this article.

There are two reasons for that- it prevents two users from editing the file at the same time, and it also provides limited syntax checking.

Even if you are the only root user, you need the syntax checking, so use "visudo". We're going to start with the simplest setup of all: You might think there's no reason to do this- it would make more sense just to give them the root password, wouldn't it? Well, maybe, but then they can login as root also- with sudo they will have to use the sudo command and we can require a password that IS NOT root's password.

Sudo commands can be logged, so we can keep track of what the person did. We can turn their sudo capability on or off at will without affecting other sudo users- no need to change the root password back and forth.

This is a great way to keep track of consultants and other support people who may need root power, but you want to keep tabs on what they do. Of course there's a strong implication of honesty here- such a user could edit the sudo logs to hide any mischief.

This file MUST be edited with the 'visudo' command as root.

Ap sample prompt

With this in place, "jim" can use sudo to run any command with root privileges. That's typical, although sudo can be compiled to use its own compiled in PATH instead. The password requested is NOT root's.

Ap sample prompt

In this case, "jim" has to provide his own login password to get sudo to work. By default, sudo remembers the password for 5 minutes and won't ask again if reinvoked within that time: Additionally, the password requested can be root's instead of their own. Let's change "jim" a bit by adding this line: First, "jim" needs root's password to run sudo because of "runaspw".

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Have you tried Searching this site?. Support Rates. This is a Unix/Linux resource website. It contains technical articles about Unix, Linux and general computing related subjects, opinion, news, help files, how-to's, tutorials and more.

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