For security reasons, rexec, rsh,
and rlogin are not enabled by default in Red Hat Linux 7.2. You
should use the OpenSSH suite of tools instead. Information concerning
the OpenSSH tools can be found in Chapter 10 and the
Official Red Hat Linux Customization Guide.
If you must use rexec, rsh, and
rlogin, and if you need to use them as root, you will
need to make a few modifications to the
/etc/securetty file. All three of these tools have
PAM configuration files that require the
pam_securetty.so PAM module, so you must edit
/etc/securetty to allow root access.
Before you can log in as root using these tools, you first have to have
them properly set up. First, install the rsh-server
RPM, which is included with Red Hat Linux 7.2. See the
Official Red Hat Linux Customization Guide if you need assistance using
RPM.
Next, run serviceconf and enable rexec,
rsh, and rlogin. See the
serviceconf man page if you need help using this tool.
Finally, restart xinetd with /sbin/service
xinetd restart to activate the serviceconf
changes. At this point, all users except root will be able to use
rexec, rsh, and
rlogin.
To allow root to use these tools, add the names of the tools you wish to
allow to the /etc/securetty. If you wanted to
enable root login using rexec,
rsh, and rlogin, add the following
lines to /etc/securetty:
To allow root to log in using these tools via telnet
(an even worse idea but necessary in some environments), add a few more lines:
