Red Hat Enterprise Linux 3: System Administration Guide
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# 27.2. An Overview of Security-Related Packages

To enable the secure server, you need to have the following packages installed at a minimum:

`httpd`

  The `httpd` package contains the `httpd` daemon and related utilities, configuration files, icons, Apache HTTP Server modules, man pages and other files used by the Apache HTTP Server.

`mod_ssl`

  The `mod_ssl` package includes the `mod_ssl` module, which provides strong cryptography for the Apache HTTP Server via the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols.

`openssl`

  The `openssl` package contains the OpenSSL toolkit. The OpenSSL toolkit implements the SSL and TLS protocols and also includes a general purpose cryptography library.

Additionally, other software packages provide certain security functionalities (but are not required by the secure server to function):

`httpd-devel`

  The `httpd-devel` package contains the Apache HTTP Server include files, header files and the APXS utility. You need all of these if you intend to load any extra modules, other than the modules provided with this product. See the Red Hat Enterprise Linux Reference Guide for more information on loading modules onto your secure server using Apache's DSO functionality.

  If you do not intend to load other modules onto your Apache HTTP Server, you do not need to install this package.

OpenSSH packages

  The OpenSSH packages provide the OpenSSH set of network connectivity tools for logging into and executing commands on a remote machine. OpenSSH tools encrypt all traffic (including passwords), so you can avoid eavesdropping, connection hijacking, and other attacks on the communications between your machine and the remote machine.

  The `openssh` package includes core files needed by both the OpenSSH client programs and the OpenSSH server. The `openssh` package also contains `scp`, a secure replacement for `rcp` (for copying files between machines).

  The `openssh-askpass` package supports the display of a dialog window which prompts for a password during use of the OpenSSH agent.

  The `openssh-askpass-gnome` package can be used in conjunction with the GNOME desktop environment to display a graphical dialog window when OpenSSH programs prompt for a password. If you are running GNOME and using OpenSSH utilities, you should install this package.

  The `openssh-server` package contains the `sshd` secure shell daemon and related files. The secure shell daemon is the server side of the OpenSSH suite and must be installed on your host to allow SSH clients to connect to your host.

  The `openssh-clients` package contains the client programs needed to make encrypted connections to SSH servers, including the following: `ssh`, a secure replacement for `rsh`; `sftp`, a secure replacement for `ftp` (for transferring files between machines); and `slogin`, a secure replacement for `rlogin` (for remote login) and `telnet` (for communicating with another host via the Telnet protocol).

  For more information about OpenSSH, see Chapter 22 OpenSSH, the Red Hat Enterprise Linux Reference Guide, and the OpenSSH website at http://www.openssh.com.

`openssl-devel`

  The `openssl-devel` package contains the static libraries and the include file needed to compile applications with support for various cryptographic algorithms and protocols. You need to install this package only if you are developing applications which include SSL support — you do not need this package to use SSL.

`stunnel`

  The `stunnel` package provides the Stunnel SSL wrapper. Stunnel supports the SSL encryption of TCP connections, so it can provide encryption for non-SSL aware daemons and protocols (such as POP, IMAP and LDAP) without requiring any changes to the daemon's code.

Table 27-1 displays a summary of the secure server packages and whether or not each package is optional for the installation of a secure server.

Package Name | Optional?
--- | ---
`httpd` | no
`mod_ssl` | no
`openssl` | no
`httpd-devel` | yes
`openssh` | yes
`openssh-askpass` | yes
`openssh-askpass-gnome` | yes
`openssh-clients` | yes
`openssh-server` | yes
`openssl-devel` | yes
`stunnel` | yes

Table 27-1. Security Packages

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