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Table 1-6 contains a combined list of the typical users created when a fresh Red Hat or Debian system is installed; thus, not all users in the table may be present on your system, as some are specific to one distribution or the other. This is also dependent on the packages you have installed on your system, so others may be present on your installation. I labeled two users as Maybe, meaning that they are optionally removable from your system. These were the mail and nobody users. Several packages utilize these users to run processes after the package has dropped privileges. For example, some e-mail servers, such as Sendmail, use the mail user for this purpose, and it is common for Apache to use the nobody user. You should check to see if any processes or packages are utilizing these users before you delete them. You can do this by using the ps command. puppy# ps -U mail -u mail PID TTY TIME CMD 809 00:00:03 fetchmail Replace mail with the username of each user you want to check.

To remove a user from your system, you can use the userdel command. If you use the userdel command in conjunction with the -r option, you will also remove users home directories, any files in their home directories, and their mail spools. Be sure to check you are removing material that should be deleted. Additional files or directories belonging to that user outside their home directory will not be removed, and you will need to optionally find these files and directories and remove them if required. These are the groups that can generally be removed: lp news uucp proxy postgres www-data backup operator list irc src gnats staff games users gdm telnetd gopher ftp nscd rpc rpcuser nfsnobody xfs desktop To remove a group from the system, you can use the groupdel command. This command has no options. puppy# groupdel sales

As part of the user and group creation process, you need to ensure your users choose suitable and secure passwords for their accounts and that those passwords are managed and changed on a regular basis I mentioned earlier in this chapter shadow passwords and using the /etc/shadow file Additionally, most distributions also come with support for MD5 passwords Without MD5 your passwords are encrypted via DES (the Data Encryption Standard), which is significantly more vulnerable to cracking attempts than MD5 passwords You should enable both shadow passwording and MD5 passwords as part of your install process Your users ability to choose their own passwords is one of the most frustrating and dangerous parts of user administration Almost all your users have one objective when choosing a password: choosing one that is easy for them to remember Security is simply not a consideration.

This window shows you all the tasks that are currently running and contains features for filtering and jumping directly to where the task is declared. Run the application in debug mode, ensuring that you have added a breakpoint to the first line. When the breakpoint is hit on the main menu, go to Debug Windows Parallel Tasks (Ctrl+Shift+D+K)

Changing their password on a regular basis for them is an inconvenience and a chore But it is an essential activity for the ongoing security of your system A lot of people in the security world believe this sort of attitude is able to be changed with education about the risks of poor password security I believe this is only partially true To an extent no matter how often most of your users are told to treat their password like the personal identification number (PIN) to their cash card, they simply do not attach the same importance to it as they would something valuable to them personally This is not to say you should not attempt to educate them, but do not count on it changing their attitudes I recommend taking a consultative but ultimately dictatorial approach to determining the characteristics of your password variables and regime.

Explain the security requirements of your environment to your end users, but do not compromise that security by making exceptions to your overall password rules I recommend you set your password rules, taking into consideration the following points: Do not allow passwords with dictionary words, such as dog, cat, or elephant The same applies for non-English-language words Do not allow passwords with only letters or numbers, such as 12345678 or abcdefghi Ensure users do not use personal information such as dates of birth, pet names, names of family members, phone numbers, or post and zip codes Set a minimum password length of ten Longer is better Force users to mix case; in other words, use both uppercase and lowercase letters in the password Force users to mix letters, numbers, and punctuation in the password.