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authentication updates such as password changes. Session management refers to tasks performed before a service is accessed and before it is shut down. These include tasks like initiating a log of a user s activity or mounting and unmounting home directories.
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TIP As an alternative to the /etc/pam.d directory, you could create one configuration file called the /etc/pam .conf file. Entries in this file have a service field, which refers to the application that the module is used for. If the /etc/pam.d directory exists, /etc/pam.conf is automatically ignored.
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The control-flag field indicates how PAM is to respond if the module fails. The control can be a simple directive or a more complicated response that can specify return codes like open_err with actions to take. The simple directives are requisite, required, sufficient, and optional. The requisite directive ends the authentication process immediately if the module fails to authenticate. The required directive only ends the authentication after the remaining modules are run. The sufficient directive indicates that success of this module is enough to provide authentication unless a previous required module has failed. The optional directive indicates the module s success is not needed unless it is the only authentication module for its service. If you specify return codes, you can refine the conditions for authentication failure or success. Return codes can be given values such as die or ok. The open_err return code could be given the action die, which would stop all authentication and return failure. The /etc/pam.d/ vsftpd configuration file for the FTP server is shown here.
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#%PAM-1.0 auth required pam_listfile.so item=user sense=deny file=/etc/vsftpd.ftpusers onerr=succeed auth required pam_stack.so service=system-auth auth required pam_shells.so account required pam_stack.so service=system-auth session required pam_stack.so service=system-auth
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Installing, uninstalling, or updating software packages has always been a simple process in Red Hat Linux due to the widespread use of the Red Hat Package Manager. Instead of using a standard TAR archive, software is packaged in a special archive for use with the Red Hat Package Manager (RPM). An RPM archive contains all the program files, configuration files, data files, and even documentation that constitute a software application. With one simple operation, the Red Hat Package Manager installs all these for you. It also checks for any other software packages that the program may need to run correctly. You can even create your own RPM packages. Red Hat provides an RPM window-based tool called redhat-config-packages to manage your RPM packages, installing new ones, updating or uninstalling ones you already have. The redhat-config-packages tool provide an easy-to-use interface for managing your packages, enabling you to obtain detailed information on a package easily, including a complete listing of the files it installs.
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TIP The Red Hat Update Agent, through the Red Hat Network, will automatically download and update any Red Hat RPM packages for you that are installed on your system and are part of the Red Hat distribution. The service is provided on a subscription basis.
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You can also download source code versions of applications, and then compile and install them on your system. Where this process once was complex, it has been significantly 3 streamlined with the addition of configure scripts. Most current source code, including GNU software, is distributed with a configure script. The configure script automatically 3 detects your system configuration and generates a Makefile, which is used to compile the application and create a binary 3 file that is compatible with your system. In most cases,
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with a few Makefile operations, you can compile and install a complex source code on any system.
Software Repositories
You can download Linux software from many online sources. You can find sites for particular kinds of applications, such as Gnome and KDE, as well as for particular distributions, such as Red Hat. The Red Hat Network can automatically download and update software installed from RPM packages that make up the Red Hat distribution. Some sites are repositories for RPM packages, such as rpmfind.net, and others like freshmeat.net refer you to original development sites where you can download software packages. The freshmeat.net and www.linuxapps.com sites are useful for finding out about new available software. Many of the open-source Linux projects can be found at sourceforge.net. Here you will find detailed documentation and recent versions of software packages. For applications designed for the Gnome desktop, you can check www.gnome.org, and you can find KDE applications at apps.kde.com. For particular database and office applications, you can download software packages directly from the company s web site, such as www.oracle.com for the Oracle database. Table 3-1 lists several popular Linux software sites.
FTP and Web Sites ftp.redhat.com freshmeat.net linuxapps.com rpmfind.net freshrpms.net sourceforge.net www.gnome.org apps.kde.com rmpseek.com Applications Software packaged in RPM packages for Red Hat Linux software, including RPMs Linux software, including RPMs RPM package repository Customized RPM packages Linux open source software projects Gnome software KDE software Linux software search site
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