16.1. Linux SSH2 Client/Server

Since Linux is all about choices we have provided as an alternative the commercial verion of OpenSSH, The SSH2 and these installation instructions assume

• Commands are Unix-compatible.

• The source path is /var/tmp, other paths are possible.

• Installations were tested on Red Hat Linux 6.1 and 6.2.

• All steps in the installation will happen in super-user account root.

• SSH2 version number is 2.0.13

Packages that you need can be downloaded from:

once you have got the Tarballs, It is a good idea to make a list of files on the system before you install ssh2, and one afterwards, and then compare them using diff to find out what file it placed where. Simply run find /* > SSH1 before and find /* > SSH2 after you install the software, and use diff SSH1 SSH2 > SSH-Installed to get a list of what changed.

Before you Compile, you need to decompress the tarball tar.gz.

           [root@deep] /#cp ssh-version.tar.gz /var/tmp
           [root@deep] /#cd /var/tmp
           [root@deep ]/tmp#tar xzpf ssh-version.tar.gz
           

You need to Compile and Optimize so move into the new SSH2 directory and type the following commands on your terminal:

           CC="egcs" \
           CFLAGS="-O9 -funroll-loops -ffast-math -malign-double -mcpu=pentiumpro -march=pentiumpro -fomit-frame-pointer -fno-exceptions" \
           ./configure \
           --prefix=/usr \
           --without-ssh-agent1-compat \
           --disable-suid-ssh-signer \
           --disable-tcp-port-forwarding \
           --disable-X11-forwarding \
           --enable-tcp-nodelay \
           --with-libwrap
           

This tells SSH2 to set itself up for this particular hardware setup as follows:

• Leave out ssh-agent1 compatibility.

• Install ssh-signer without suid bit.

• Disable port forwarding support.

• Disable X11 forwarding support.

• Enable TCP_NODELAY socket option.

• Compile in libwrap tcp_wrappers support.

           [root@deep ]/ssh-2.0.13#make clean 
           [root@deep ]/ssh-2.0.13# make 
           [root@deep ]/ssh-2.0.13# make install 
           [root@deep ]/ssh-2.0.13#rm -f  /usr/bin/ssh-askpass
           

Please don't forget to cleanup after work:

           [root@deep] /#cd /var/tmp
           [root@deep ]/tmp#rm -rf ssh-version/ ssh-version.tar.gz