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When you first add a user to the system, you must provide the user with a skeleton version of their login, shell, and logout initialization files. For the bash shell, this would be the .bash_profile, .bashrc, and .bash_logout files. The useradd command and other user management tools like Red Hat User Manager add these files automatically, copying any files in the directory /etc/skel to the user s new home directory. The /etc/skel directory contains a skeleton initialization file for the .bash_profile, .bashrc, and .bash_logout files or, if you are using the tcsh shell as your login shell, the .login, .tcshrc, and .logout files. The /etc/skel directory also contains default files and directories for your desktops. These include a .screenrc file for the X Window System, a .kde directory for the KDE desktop, and a Desktop directory that contains default configuration files for the Gnome desktop. As a superuser, you can configure the .bash_profile or .bashrc file in the /etc/skel directory any way you want. Usually, basic system variable assignments are included that define pathnames for commands and command aliases. The PATH and BASH_ENV variables are defined in .bash_profile. Once users have their own
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.bash_profile or .bashrc file, they can redefine variables or add new commands as they choose.
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Systemwide values used by user and group creation utilities such as useradd and usergroup are kept in the /etc/login.defs file. Here you will find the range of possible user and group IDs listed. UID_MIN holds the minimum number for user IDs, and UID_MAX the maximum number. Various password options control password controls such as PASS_MIN_LEN, which determines the minimum number of characters allowable in a password. Options such as CREATE_HOME can be set to tell user tools like useradd to create home directories for new accounts by default. Samples of these entries are shown here. MAIL_DIR /var/spool/mail PASS_MIN_LEN 5 CREATE_HOME yes
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You can control user login access by remote users to your system with the /etc/login.access file. The file consists of entries listing users, whether they are allowed access, and from where they can access the system. A record in this file consists of three colon-delimited fields: a plus (+) or minus ( ) sign indicating whether users are allowed access, user login names allowed access, and the remote system (host) or terminal (tty device) from which they are trying to log in. The following enables the user chris to access the system from the rabbit.mytrek.com remote system: +:chris:rabbit.mytrek.com
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You can list more than one user or location, or use the ALL 2 option in place of either users or locations to allow access by all users and locations. The ALL option can be qualified with the EXCEPT option to allow access by all users except 2 certain specified ones. The following entry allows any valid
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user to log in to the system using the console, except for the users larisa and aleina: +:ALL EXCEPT larisa aleina:console Other access control files are used to control access for specific services, such as the hosts.deny and hosts.allows files used with the tcpd daemon for xinetd-supported servers.
Controlling User Passwords
Once you have created a user account, you can control the user s access to it. Both the Red Hat User Manager and the passwd tool let you lock and unlock a user s account. You use the passwd command with the -l option to lock an account, invalidating its password, and you use the -u option to unlock it. You can also force a user to change his or her password at given intervals by setting an expiration date for that password. Both the Red Hat User Manger and the chage command let you specify an expiration limit for a user s password. A user could be required to change his or her password every month, every week, or at a given date. Once the password expires, the user will be prompted to enter a new one. You can issue a warning beforehand, telling the user how much time is left before the password expires. For accounts that you want to close, you can permanently expire a password. You can even shut down accounts that are inactive too long. In the next example, the password for the chris account will stay valid for only 7 days. The -M option with the number of days sets the maximum time that a password can be valid. chage -M 7 chris
To set a particular date for the account to expire, use the -E option with the date specified mm/dd/yyyy. chage -E 07/30-/2003 chris
To find out what the current expiration settings are for a given account, use the -l option. chage -l chris
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