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.

[[email protected]] /#cp ssh-version.tar.gz /var/tmp [[email protected]] /#cd /var/tmp [[email protected] ]/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.

[[email protected] ]/ssh-2.0.13#make clean [[email protected] ]/ssh-2.0.13# make [[email protected] ]/ssh-2.0.13# make install [[email protected] ]/ssh-2.0.13#rm -f /usr/bin/ssh-askpass

Please don't forget to cleanup after work:

[[email protected]] /#cd /var/tmp [[email protected] ]/tmp#rm -rf ssh-version/ ssh-version.tar.gz

The rm command as used above will remove all the source files we have used to compile and install SSH2. It will also remove the SSH2 compressed archive from the /var/tmp directory.