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On Red Hat systems2 when non-root users log into the console, they are granted access to some additional programs that they would otherwise not be able to run. Additionally, they are given permissions to certain files they would not have as normal users solely because they are logged onto the console. To achieve this, Red Hat uses a PAM module called pam_console.so, which is defined in the PAM login service. See the Pluggable Authentication Modules (PAM) section.

Every person who has Internet access has an account with an Internet service provider (ISP). Each ISP has its own unique domain name. For example, America Online s domain name is AOL.com. MSN s domain name is MSN.com. Comcast s domain name is Comcast.net. Those are just a few examples. There are thousands of ISPs in the world. Every person who has an account with an ISP has a unique user name (called a screen name by AOL). No two people who share the same ISP can have the same user name. If they did, there would be no way to tell them apart. Each person who has an account with an ISP also has an e-mail address that s expressed in the format username@domain.name. To send an e-mail to someone, you just need to address the e-mail message to his or her e-mail address. The Internet and ISP take care of making sure that your message gets to the right person. Each ISP has two main computers for handling e-mail. One is called the outgoing mail server, or SMTP (Simple Mail Transfer Protocol) server. That server handles all mail being sent by the ISP s customers

Chuck (square cut)

s If more than one non-root user is logged onto console, the first user to log in gets the right to run Tip

. . . . . . . .

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PNG (Portable Network Graphics) format is a compressed format that s gaining popularity as a format for Web pictures. Like JPEG, it supports millions of colors, and is therefore suitable for photos. Like GIF it , allows for transparency, and is therefore useful for creating images with a transparent background.

The configuration files contained in the /etc/security/console.apps/ directory define the additional programs that users logged onto the console can run. This directory contains a collection of files, and each file corresponds to a command that users, after logging onto the console, can run as if they were root. puppy# ls -l /etc/security/console.apps/ -rw-r--r-1 root root 10 Aug 22 2003 authconfig -rw-r--r-1 root root 87 Aug 22 2003 authconfig-gtk -rw-r--r-1 root root 83 Sep 20 2003 dateconfig -rw-r--r-1 root root 64 May 29 01:31 ethereal -rw-r--r-1 root root 66 Apr 15 00:33 gdmsetup -rw-r--r-1 root root 14 Sep 26 2003 halt Whilst perhaps this model of granting extra privileges to console users makes administration for your system easier, I do not think this is a good idea from a security perspective. Most, if not all of these programs, should be run only by root, and the risk posed by this access being granted to a non-root user just because the user is able to login to the console is not acceptable on a production system. So, I recommend you disable this functionality. You can do this by removing the contents of the /etc/security/console.apps directory. Enter the following: puppy# rm -f /etc/security/console.apps/* The file /etc/security/console.perms contains the additional permissions provided. I also recommend you go through the permissions granted to users in the console.perms file and confirm you are comfortable granting all of them to non-root users who are logged into the console.

Now that you prepared your e-mail in Dreamweaver, it s time to send it!

s You will also find sample configuration files for other PAM modules in the /etc/security directory. Tip

0 0.167 0.090 0.150 0.113 0.140 0.123 0.135 0.127 0.132 0.129 0.130

To type 8-) (*) (N) or (n) (Y) or (y) (F) or (f) (W) or (w) (K) or (k) (L) or (l) (U) or (u) :-[ or :[ (&) (@) ({) (}) (X) or (x) (Z) or (z) (M) or (m) (I) or (i) (C) or (c) (O) or (o) Continued

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I will talk about some of them in the Pluggable Authentication Modules (PAM) section later in this chapter.