sbd Package Description
sbd is a Netcat-clone, designed to be portable and offer strong encryption. It runs on Unix-like operating systems and on Microsoft Win32. sbd features AES-CBC-128 + HMAC-SHA1 encryption (by Christophe Devine), program execution (-e option), choosing source port, continuous reconnection with delay, and some other nice features. sbd supports TCP/IP communication only.
- Author: Michel Blomgren
- License: GPLv2
Tools included in the sbd package
sbd – Secure backdoor for linux and windows
[email protected]:~# sbd -h
sbd 1.37 Copyright (C) 2004 Michel Blomgren <[email protected]>
$Id: sbd.c,v 1.37 2005/08/21 22:40:47 shadow Exp $
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
connect (tcp): sbd [-options] host port
listen (tcp): sbd -l -p port [-options]
options:
-l listen for incoming connection
-p n choose port to listen on, or source port to connect out from
-a address choose an address to listen on or connect out from
-e prog program to execute after connect (e.g. -e cmd.exe or -e bash)
-r n infinitely respawn/reconnect, pause for n seconds between
connection attempts. -r0 can be used to re-listen after
disconnect (just like a regular daemon)
-c on|off encryption on/off. specify whether you want to use the built-in
AES-CBC-128 + HMAC-SHA1 encryption implementation (by
Christophe Devine - http://www.cr0.net:8040/) or not
default is: -c on
-k secret override default phrase to use for encryption (secret must be
shared between client and server)
-q hush, quiet, don't print anything (overrides -v)
-v be verbose
-n toggle numeric-only IP addresses (don't do DNS resolution). if
you specify -n twice, original state will be active (i.e. -n
works like a on/off switch)
-m toggle monitoring (snooping) on/off (only used with the -e
option). snooping can also be turned on by specifying -vv (-v
two times)
-P prefix add prefix (+ a hardcoded separator) to all outbound data.
this option is mostly only useful for sbd in "chat mode" (to
prefix lines you send with your nickname)
-H on|off highlight incoming data with a hardcoded (color) escape
sequence (for e.g. chatting). default is: -H off
-V print version banner and exit (include that output in your
bug report and send bug report to [email protected])
unix-like OS specific options:
-s invoke a shell, nothing else. if sbd is setuid 0, it'll invoke
a root shell
-w n "immobility timeout" in seconds for idle read/write operations
and program execution (the -e option)
-D on|off fork and run in background (daemonize). default: -D off
sbd Usage Example
On the server, listen for a connection (-l) on port 4444 (-p 4444), execute bash on connection (-e bash) and display verbose output (-v) with no name resolution (-n).
On the client, connect to the remote server IP address (192.168.1.202) and port (4444).
[email protected]:~# sbd -l -p 4444 -e bash -v -n
listening on port 4444
[email protected]:~# sbd 192.168.1.202 4444
id
uid=0(root) gid=0(root) groups=0(root)