Warning! This is a test release ONLY! The security and authenicity of this
program provides is not guaranteed! Therefore, by default the server
program will NOT execute any commands, even if a correct key combination
is used. Please wait for a stable version before deploying on a system.

If you do test and find a bug, please submit it to [email protected]

Thanks!
Jordan Wilberding

About
-----
One-time cipher based back door program for executing emergency commands.

Secure Back Door(SBD) is an alternative to leaving SSH open all the time.
It is based on a secure one-time keypad method, that insures maximum 
security. Since SBD is very small, it is less likely to have security
exploits, as compared to SSH. Therefore, you could leave an important 
computer up and running with just sbdd running in the background, and
if an emergency came about, you could simple execute a command to bring
ssh up, then work on the computer as regular. It would be as simple
as doing ./sbd domain.com "/etc/init.d/sshd start", and with the proper
key file set, the remote computer would have ssh up and running shortly.

Protocol
--------

The protocol is detailed to an extent in the text file PROTOCOL, I
will update it with more details as I have time, but the most important
details are included already.

If you are a crypt analysis, or just like a challenge, I appreciate anyone
who is willing to look through the protocol and/or code and point out
possible security implications and flaws in design! If you do find 
something wrong please e-mail me at [email protected]

Compilation In Linux
--------------------

g++ -Wall -O2 -o sbdd ssocket.cpp sha1.cpp utils.cpp sbdd.cpp
g++ -Wall -O2 -o sbd csocket.cpp sha1.cpp utils.cpp sbd.cpp

Compilation In Windows
----------------------

Open sbdd.dsp and sbd.dsp and build normally.


Running Server
-------

./sbdd port -- Default port is 31415
Example 1: ./sbdd
Example 2: ./sbdd 5151


Running Client
--------------

./sbd hostname port message
Example 1: ./sbd localhost "/etc/init.d/sshd start" 
Example 2: ./sbd localhost 5151 "/etc/init.d/sshd start"


Random Bytes Setup
------------------

In order for the client and server to properly work, you will
need to have identical files enckey.bits for client, and deckey.bits
for the server. You should also have an additional file of random bytes
named athkey.bits for the server, which is used for authenticating the
client against basic IP sproofs. There is a copy of each provided with 
the distribution for testing, but they should not be used for production, 
you need to generate your OWN random bytes. The easiest way might be to goto
http://www.random.org, or create your own grand scheme. The production
of random bytes is not provided by sbd.

Contact
-------

Report bugs at http://sourceforge.net/tracker/?group_id=120366&atid=686787
or email me at [email protected]