OpenSSH is a Secure Shell transferring program that will
allow you to use encrypted information transfer between your
computer and other unix computers.
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You will first need to download the SSH Source Code. You
can do that by clicking
here
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When the download has completed, you can now move the
source code to a system level directory. To do this, you
need to open up an X-term (this can be
launched under most window managers by clicking on the
icon that looks like a monitor on the tool bar) , and
then change to the directory that you just downloaded the
source code package to.
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You will first need to be running as root in order to
write to a system level directory. To do this, type:
su (now type your root-level
password)
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Now that you are running as root, you can move the source
code by typing at the command prompt:
mv ./openssh-2.9p2.tar.gz
/usr/local/src/.
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Now, change directory to the source directory by typing:
cd /usr/local/src
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You now need to uncompress and extract the source code
files by typing:
tar zxf openssh-2.9p2.tar.gz
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Now that the files have been extracted, if you want to
conserve disk space, you may delete the package of source
code by typing:
rm openssh-2.9p2.tar.gz
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Once the files have extracted, you need to change
directory into the source code directory by typing:
cd openssh-2.9p2/
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To begin the installation, you first need to run the
configure script. This script will gather information
about your computer and its configuration that it will
need during the compilation process. You run this script
by typing:
./configure --with-tcp-wrappers
--with-xauth=/usr/X11R6/bin/xauth
(Note: The next few steps can take several minutes to
complete)
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You are now ready to compile the program for your
computer. To do this, simply type:
make
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Once you have compiled the program, you will need to make
it a system level install. Since you are running as root,
you can do the system level installation by typing:
make install
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It is a good idea at this point to remove the object
files that your computer used to compile SSH. This can be
done by typing:
make clean
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Your system is now setup to use the Secure Shell Client.
You will need to do a few more steps to configure your
computer to allow SSH connections to come into it. The
easiest way to do this is to edit a script that runs at
startup to have it automatically start the Secure Shell
Server. To edit this file, type:
pico /etc/rc.d/rc.local
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After the lines that begin with a "#", on a line by
itself, you need to type:
/usr/local/sbin/sshd
Now hit control-x, then type Y to save
this file.
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Linux uses an authentication module called PAM, which
stands for Pluggable Authentication Module. In order for
PAM to recognize the SSHD program and allow you to log
into your machine, you will need to copy the module that
comes with OpenSSH to the appropriate directory. This can
be done by typing:
cp
/usr/local/src/openssh-2.9p2/contrib/redhat/sshd.pam
/etc/pam.d/sshd
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In order to enable your computer to do forwarding of
graphical applications over SSH connections, you will
need to edit the file:
/usr/local/etc/sshd_config
On the line that states:
X11Forwarding no
You will need to change the no to
yes, and then exit and save the file.
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The next time you reboot your computer, the Secure Shell
server and clients will be automatically available for
your use. If you wish to not reboot your computer at this
time, you can also start the Secure Shell Server manually
by typing at the command prompt:
/usr/local/sbin/sshd
