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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
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This General Public License does not permit incorporating your program into
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Public License instead of this License.

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VERSION DESCRIPTION
-----------------------------------------------------------------------------
0.5 - Added ability to change the knocking protocol (TCP/UDP) on a
per-port basis using the knock client (instead of the -u
switch)
- Patches from Philippe Lovis <philippe.lovis@gmx.ch>:
- Fixed memory leaks and potential security vulnerabilities
- Added --lookup option for DNS lookups (default is off)
- Added support for one-time sequences
- Added Interface directive to select the listening interface
- Moved packet filtering to kernel space with BPF filters
- Support for excluding TCP flags with "!"
- Removed the leftover/deprecated layer-2 MAC logic
0.4 - Added support for DLT_RAW (PPPoE) interfaces
- Changed packet inspection to use the interface's IP address
to determine the flow direction, rather than the ethernet
MAC address
- Changed logging date format to ISO (yyyy-mm-dd)
- Added hostnames to logging output
0.3.1 - Fixed a segfault occurring when a hostname cannot be resolved
- Patch from Simon Matter <simon.matter@ch.sauter-bc.com>:
- fixes build errors on Fedora
- Patch from Per Cederberg <per@percederberg.net>:
- fixes TCP SYN timeouts in knock client
0.3 - Added PPP (LINUX_SLL) support
- Patches from Leo Costela:
- added Start_Command, Stop_Command, Cmd_Timeout directives,
allowing a single door to open and then close after a
timeout period
- knockd now re-reads config when a HUP is received
- multiple protocols supported on a per-port basis
0.2.1 - Bugfix for TCP flag discrimination
0.2 - Fixed the zombie process problem
- Added patch from Leo Costela:
- PidFile configuration directive
- support for specific TCP flags
0.1 - Initial release

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#
# knock
#
# Copyright (c) 2004 by Judd Vinet <jvinet@zeroflux.org>
#
# 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.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
# USA.
#
DESTDIR =
prefix = @prefix@
exec_prefix = @prefix@
VERSION = 0.5
BINDIR = @bindir@
SBINDIR = @sbindir@
MANDIR = @mandir@
INSTALL = @INSTALL@
INSTALL_PROGRAM = @INSTALL_PROGRAM@ $(AM_INSTALL_PROGRAM_FLAGS)
INSTALL_DATA = @INSTALL_DATA@
INSTALL_SCRIPT = @INSTALL_SCRIPT@
TOPDIR = @srcdir@
SRCDIR = $(TOPDIR)/src/
OBJDIR = $(TOPDIR)/src/
MANSRC = $(TOPDIR)/doc/
CXX = @CC@
CXXFLAGS += @CFLAGS@ -g -Wall -pedantic -fno-exceptions \
-D_GNU_SOURCE -I.
LDFLAGS += @LDFLAGS@
SRCS = $(SRCDIR)knockd.c \
$(SRCDIR)knock.c \
$(SRCDIR)list.c
all: knockd knock man
knockd: $(OBJDIR)knockd.o $(OBJDIR)list.o
$(CXX) $(OBJDIR)knockd.o $(OBJDIR)list.o -o $@ $(LDFLAGS) -lpcap
knock: $(OBJDIR)knock.o
$(CXX) $(OBJDIR)knock.o -o $@ $(LDFLAGS)
.c.o: $(SRCS)
$(CXX) $(CXXFLAGS) -o $@ -c $<
man: $(MANSRC)knockd.1 $(MANSRC)knock.1
%.1: %.1.in
sed -e "s/#VERSION#/$(VERSION)/" $< > $@
dist: distclean
(cd ..; tar czvf knock-$(VERSION).tar.gz knock-$(VERSION))
install: all
$(INSTALL) -D -m0755 knockd $(DESTDIR)$(SBINDIR)/knockd
$(INSTALL) -D -m0755 knock $(DESTDIR)$(BINDIR)/knock
$(INSTALL) -D -m0644 $(MANSRC)knockd.1 $(DESTDIR)$(MANDIR)/man1/knockd.1
$(INSTALL) -D -m0644 $(MANSRC)knock.1 $(DESTDIR)$(MANDIR)/man1/knock.1
$(INSTALL) -D -m0644 knockd.conf $(DESTDIR)/etc/knockd.conf
clean:
rm -f *~ $(OBJDIR)*.o $(MANSRC)*.1
distclean: clean
rm -f knockd knock
rm -f Makefile
rm -f config.h config.status config.log
# End of file

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knock :: A port-knocking implementation
=======================================
Copyright (c) 2004-2005, Judd Vinet <jvinet@zeroflux.org>
=========
ABOUT
=========
This is a port-knocking server/client. Port-knocking is a method where a
server can sniff one of its interfaces for a special "knock" sequence of
port-hits. When detected, it will run a specified event bound to that port
knock sequence. These port-hits need not be on open ports, since we use
libpcap to sniff the raw interface traffic.
===========
EXAMPLE
===========
The example below could be used to run a strict (DENY policy) firewall that
can only be accessed after a successful knock sequence.
1) Client sends four TCP SYN packets to Server, at the following ports:
38281, 29374, 4921, 54918
2) Server detects this and runs an iptables command to open port 22 to Client.
3) Client connects to Server via SSH and does whatever it needs to do.
4) Client sends four more TCP SYN packets to Server:
37281, 8529, 40127, 10100
5) Server detects this and runs another iptables to close port 22 to Client.
====================
KNOCKING CLIENTS
====================
The accompanying knock client is very basic. If you want to more advanced
knocks (eg, setting specific tcp flags) then you should take look at hping,
sendip or packit.
http://freshmeat.net/projects/hping/
http://freshmeat.net/projects/sendip/
http://freshmeat.net/projects/packit/
=========================
OTHER IMPLEMENTATIONS
=========================
Here are some other implementations of port-knocking:
http://sourceforge.net/projects/pasmal/
http://doorman.sourceforge.net/

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- allow IP ACLs for doors
- eg, allow = 192.168.0.0/24
- dynamic knock mechanism
- the knock sequence itself could define the port to open
- the knock sequence could be tied to predictable variables
- date: hour of the day, day of the month, year, etc

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/* config.h.in. Generated from configure.ac by autoheader. */
/* Define to 1 if you have the <arpa/inet.h> header file. */
#undef HAVE_ARPA_INET_H
/* Define to 1 if you don't have `vprintf' but do have `_doprnt.' */
#undef HAVE_DOPRNT
/* Define to 1 if you have the `fork' function. */
#undef HAVE_FORK
/* Define to 1 if you have the `inet_ntoa' function. */
#undef HAVE_INET_NTOA
/* Define to 1 if you have the <inttypes.h> header file. */
#undef HAVE_INTTYPES_H
/* Define to 1 if you have the `pcap' library (-lpcap). */
#undef HAVE_LIBPCAP
/* Define to 1 if your system has a GNU libc compatible `malloc' function, and
to 0 otherwise. */
#undef HAVE_MALLOC
/* Define to 1 if you have the `memmove' function. */
#undef HAVE_MEMMOVE
/* Define to 1 if you have the <memory.h> header file. */
#undef HAVE_MEMORY_H
/* Define to 1 if you have the <netdb.h> header file. */
#undef HAVE_NETDB_H
/* Define to 1 if you have the <netinet/in.h> header file. */
#undef HAVE_NETINET_IN_H
/* Define to 1 if you have the <pcap.h> header file. */
#undef HAVE_PCAP_H
/* Define to 1 if you have the <stdint.h> header file. */
#undef HAVE_STDINT_H
/* Define to 1 if you have the <stdlib.h> header file. */
#undef HAVE_STDLIB_H
/* Define to 1 if you have the `strcasecmp' function. */
#undef HAVE_STRCASECMP
/* Define to 1 if you have the `strdup' function. */
#undef HAVE_STRDUP
/* Define to 1 if you have the <strings.h> header file. */
#undef HAVE_STRINGS_H
/* Define to 1 if you have the <string.h> header file. */
#undef HAVE_STRING_H
/* Define to 1 if you have the `strstr' function. */
#undef HAVE_STRSTR
/* Define to 1 if you have the <syslog.h> header file. */
#undef HAVE_SYSLOG_H
/* Define to 1 if you have the <sys/socket.h> header file. */
#undef HAVE_SYS_SOCKET_H
/* Define to 1 if you have the <sys/stat.h> header file. */
#undef HAVE_SYS_STAT_H
/* Define to 1 if you have the <sys/types.h> header file. */
#undef HAVE_SYS_TYPES_H
/* Define to 1 if you have <sys/wait.h> that is POSIX.1 compatible. */
#undef HAVE_SYS_WAIT_H
/* Define to 1 if you have the <unistd.h> header file. */
#undef HAVE_UNISTD_H
/* Define to 1 if you have the `vfork' function. */
#undef HAVE_VFORK
/* Define to 1 if you have the <vfork.h> header file. */
#undef HAVE_VFORK_H
/* Define to 1 if you have the `vprintf' function. */
#undef HAVE_VPRINTF
/* Define to 1 if `fork' works. */
#undef HAVE_WORKING_FORK
/* Define to 1 if `vfork' works. */
#undef HAVE_WORKING_VFORK
/* Define to the address where bug reports for this package should be sent. */
#undef PACKAGE_BUGREPORT
/* Define to the full name of this package. */
#undef PACKAGE_NAME
/* Define to the full name and version of this package. */
#undef PACKAGE_STRING
/* Define to the one symbol short name of this package. */
#undef PACKAGE_TARNAME
/* Define to the version of this package. */
#undef PACKAGE_VERSION
/* Define as the return type of signal handlers (`int' or `void'). */
#undef RETSIGTYPE
/* Define to 1 if you have the ANSI C header files. */
#undef STDC_HEADERS
/* Define to 1 if your <sys/time.h> declares `struct tm'. */
#undef TM_IN_SYS_TIME
/* Define to empty if `const' does not conform to ANSI C. */
#undef const
/* Define to rpl_malloc if the replacement function should be used. */
#undef malloc
/* Define to `int' if <sys/types.h> does not define. */
#undef pid_t
/* Define to `unsigned' if <sys/types.h> does not define. */
#undef size_t
/* Define as `fork' if `vfork' does not work. */
#undef vfork

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.TH knock 1 "June 26, 2005" "knockd #VERSION#" ""
.SH NAME
knock \- port-knock client
.SH SYNOPSIS
\fBknock [options] <host> <port[:proto]> [port[:proto]] ...\fP
.SH DESCRIPTION
\fBknock\fP is a \fIport-knock\fP client. It sends TCP/UDP packets
to each specified \fIport\fP on \fIhost\fP, creating a special knock
sequence on the listening server (see the \fBknockd\fP manpage for more
info on this).
.SH OPTIONS
.TP
.B "\-u, \-\-udp"
Make all port hits use UDP (default is TCP).
If you want each port to use a different protocol (TCP or UDP), then you
can specify the protocol on a per-port basis. See the example below.
.TP
.B "\-v, \-\-verbose"
Output verbose status messages.
.TP
.B "\-V, \-\-version"
Display the version.
.TP
.B "\-h, \-\-help"
Syntax help.
.SH EXAMPLES
.nf
knock myserver.example.com 123:tcp 456:udp 789:tcp
knock -u myserver.example.com 8284 4721 18592 42912
.fi
.SH SEE ALSO
\fBknockd\fP is the accompanying port-knock server.
.SH AUTHOR
.nf
Judd Vinet <jvinet@zeroflux.org>
.fi

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.TH knockd 1 "June 26, 2005" "knockd #VERSION#" ""
.SH NAME
knockd \- port-knock server
.SH SYNOPSIS
\fBknockd [options]\fP
.SH DESCRIPTION
\fBknockd\fP is a \fIport-knock\fP server. It listens to all traffic on
an ethernet (or PPP) interface, looking for special "knock" sequences of port-hits.
A client makes these port-hits by sending a TCP (or UDP) packet to a
port on the server. This port need not be open -- since knockd listens
at the link-layer level, it sees all traffic even if it's destined for a
closed port. When the server detects a specific sequence of port-hits, it
runs a command defined in its configuration file. This can be used to open
up holes in a firewall for quick access.
.SH COMMANDLINE OPTIONS
.TP
.B "\-i, \-\-interface <int>"
Specify an interface to listen on. The default is \fIeth0\fP.
.TP
.B "\-d, \-\-daemon"
Become a daemon. This is usually desired for normal server-like operation.
.TP
.B "\-c, \-\-config <file>"
Specify an alternate location for the config file. Default is
\fI/etc/knockd.conf\fP.
.TP
.B "\-D, \-\-debug"
Ouput debugging messages.
.TP
.B "\-l, \-\-lookup"
Lookup DNS names for log entries. This may be a security risk! See section
\fBSECURITY NOTES\fP.
.TP
.B "\-v, \-\-verbose"
Output verbose status messages.
.TP
.B "\-V, \-\-version"
Display the version.
.TP
.B "\-h, \-\-help"
Syntax help.
.SH CONFIGURATION
knockd reads all knock/event sets from a configuration file. Each knock/event
begins with a title marker, in the form \fB[name]\fP, where \fIname\fP is the
name of the event that will appear in the log. A special marker, \fB[options]\fP,
is used to define global options.
.TP
.SH Example #1:
.RS
This example uses two knocks. The first will allow the knocker to access port
22 (SSH), and the second will close the port when the knocker is complete.
As you can see, this could be useful if you run a very restrictive (DENY policy)
firewall and would like to access it discreetly.
.nf
[options]
logfile = /var/log/knockd.log
[openSSH]
sequence = 7000,8000,9000
seq_timeout = 10
tcpflags = syn
command = /usr/sbin/iptables -A INPUT -s %IP% -j ACCEPT
[closeSSH]
sequence = 9000,8000,7000
seq_timeout = 10
tcpflags = syn
command = /usr/sbin/iptables -D INPUT -s %IP% -j ACCEPT
.fi
.RE
.TP
.SH Example #2:
.RS
This example uses a single knock to control access to port 22 (SSH). After receiving
a successful knock, the daemon will run the \fBstart_command\fP, wait for the time
specified in \fBcmd_timeout\fP, then execute the \fBstop_command\fP. This is useful
to automatically close the door behind a knocker. The knock sequence uses both UDP
and TCP ports.
.nf
[options]
logfile = /var/log/knockd.log
[opencloseSSH]
sequence = 2222:udp,3333:tcp,4444:udp
seq_timeout = 15
tcpflags = syn,ack
start_command = /usr/sbin/iptables -A INPUT -s %IP% -p tcp --syn -j ACCEPT
cmd_timeout = 5
stop_command = /usr/sbin/iptables -D INPUT -s %IP% -p tcp --syn -j ACCEPT
.fi
.RE
.TP
.SH Example #3:
.RS
This example doesn't use a single, fixed knock sequence to trigger an event,
but a set of sequences taken from a sequence file (one time sequences),
specified by the \fBone_time_sequences\fP directive. After each successful
knock, the used sequence will be invalidated and the next sequence from the
sequence file has to be used for a successful knock. This prevents an attacker
from doing a replay attack after having discovered a sequence (eg, while
sniffing the network).
.nf
[options]
logfile = /var/log/knockd.log
[opencloseSMTP]
one_time_sequences = /etc/knockd/smtp_sequences
seq_timeout = 15
tcpflags = fin,!ack
start_command = /usr/sbin/iptables -A INPUT -s %IP% -p tcp --dport 25 -j ACCEPT
cmd_timeout = 5
stop_command = /usr/sbin/iptables -D INPUT -s %IP% -p tcp --dport 25 -j ACCEPT
.fi
.RE
.SH CONFIGURATION: GLOBAL DIRECTIVES
.TP
.B "UseSyslog"
Log action messages through syslog(). This will insert log entries into your
/var/log/messages or equivalent.
.TP
.B "LogFile = /path/to/file"
Log actions directly to a file, usually /var/log/knockd.log.
.TP
.B "PidFile = /path/to/file"
Pidfile to use when in daemon mode, default: /var/run/knockd.pid.
.TP
.B "Interface = <interface_name>"
Network interface to listen on. Only its name has to be given, not the path to
the device (eg, "eth0" and not "/dev/eth0"). Default: eth0.
.SH CONFIGURATION: KNOCK/EVENT DIRECTIVES
.TP
.B "Sequence = <port1>[:<tcp|udp>][,<port2>[:<tcp|udp>] ...]"
Specify the sequence of ports in the special knock. If a wrong port with
the same flags is received, the knock is discarded. Optionally, you can
define the protocol to be used on a per-port basis (default is TCP).
.TP
.B "One_Time_Sequences = /path/to/one_time_sequences_file"
File containing the one time sequences to be used. Instead of using a fixed
sequence, knockd will read the sequence to be used from that file. After each
successful knock attempt this sequence will be disabled by writing a '#'
character at the first position of the line containing the used sequence. That
used sequence will then be replaced by the next valid sequence from the file.
Because the first character is replaced by a '#', it is recommended that you
leave a space at the beginning of each line. Otherwise the first digit in
your knock sequence will be overwritten with a '#' after it has been used.
Each line in the one time sequences file contains exactly one sequence and has
the same format as the one for the \fBSequence\fP directive. Lines beginning
with a '#' character will be ignored.
\fBNote\fP: Do not edit the file while knockd is running!
.TP
.B "Seq_Timeout = <timeout>"
Time to wait for a sequence to complete in seconds. If the time elapses
before the knock is complete, it is discarded.
.TP
.B "TCPFlags = fin|syn|rst|psh|ack|urg"
Only pay attention to packets that have this flag set. When using TCP flags,
knockd will IGNORE tcp packets that don't match the flags. This is different
than the normal behavior, where an incorrect packet would invalidate the entire
knock, forcing the client to start over. Using "TCPFlags = syn" is useful if
you are testing over an SSH connection, as the SSH traffic will usually
interfere with (and thus invalidate) the knock.
Separate multiple flags with commas (eg, TCPFlags = syn,ack,urg). Flags can be
explicitly excluded by a "!" (eg, TCPFlags = syn,!ack).
.TP
.B "Start_Command = <command>"
Specify the command to be executed when a client makes the correct
port-knock. All instances of \fB%IP%\fP will be replaced with the
knocker's IP address. The \fBCommand\fP directive is an alias for
\fBStart_Command\fP.
.TP
.B "Cmd_Timeout = <timeout>"
Time to wait between \fBStart_Command\fP and \fBStop_Command\fP. This
directive is optional, only required if \fBStop_Command\fP is used.
.TP
.B "Stop_Command = <command>"
Specify the command to be executed when \fBCmd_Timeout\fP seconds have passed
since \fBStart_Command\fP has been executed. All instances of \fB%IP%\fP will
be replaced with the knocker's IP address. This directive is optional.
.SH SECURITY NOTES
Using the \fB-l\fP or \fB--lookup\fP commandline option to resolve DNS names
for log entries may be a security risk! An attacker may find out the first port
of a sequence if he can monitor the DNS traffic of the host running knockd.
Also a host supposed to be stealth (eg, dropping packets to closed TCP ports
instead of replying with an ACK+RST packet) may give itself away by resolving a
DNS name if an attacker manages to hit the first (unknown) port of a sequence.
.SH SEE ALSO
\fBknock\fP is the accompanying port-knock client, though \fBtelnet\fP or
\fBnetcat\fP could be used for simple TCP knocks instead.
For more advanced knocks, see \fBhping\fP, \fBsendip\fP or \fBpackit\fP.
.SH AUTHOR
.nf
Judd Vinet <jvinet@zeroflux.org>
.fi

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#!/bin/sh
#
# install - install a program, script, or datafile
# This comes from X11R5 (mit/util/scripts/install.sh).
#
# Copyright 1991 by the Massachusetts Institute of Technology
#
# Permission to use, copy, modify, distribute, and sell this software and its
# documentation for any purpose is hereby granted without fee, provided that
# the above copyright notice appear in all copies and that both that
# copyright notice and this permission notice appear in supporting
# documentation, and that the name of M.I.T. not be used in advertising or
# publicity pertaining to distribution of the software without specific,
# written prior permission. M.I.T. makes no representations about the
# suitability of this software for any purpose. It is provided "as is"
# without express or implied warranty.
#
# Calling this script install-sh is preferred over install.sh, to prevent
# `make' implicit rules from creating a file called install from it
# when there is no Makefile.
#
# This script is compatible with the BSD install script, but was written
# from scratch. It can only install one file at a time, a restriction
# shared with many OS's install programs.
# set DOITPROG to echo to test this script
# Don't use :- since 4.3BSD and earlier shells don't like it.
doit="${DOITPROG-}"
# put in absolute paths if you don't have them in your path; or use env. vars.
mvprog="${MVPROG-mv}"
cpprog="${CPPROG-cp}"
chmodprog="${CHMODPROG-chmod}"
chownprog="${CHOWNPROG-chown}"
chgrpprog="${CHGRPPROG-chgrp}"
stripprog="${STRIPPROG-strip}"
rmprog="${RMPROG-rm}"
mkdirprog="${MKDIRPROG-mkdir}"
transformbasename=""
transform_arg=""
instcmd="$mvprog"
chmodcmd="$chmodprog 0755"
chowncmd=""
chgrpcmd=""
stripcmd=""
rmcmd="$rmprog -f"
mvcmd="$mvprog"
src=""
dst=""
dir_arg=""
while [ x"$1" != x ]; do
case $1 in
-c) instcmd="$cpprog"
shift
continue;;
-d) dir_arg=true
shift
continue;;
-m) chmodcmd="$chmodprog $2"
shift
shift
continue;;
-o) chowncmd="$chownprog $2"
shift
shift
continue;;
-g) chgrpcmd="$chgrpprog $2"
shift
shift
continue;;
-s) stripcmd="$stripprog"
shift
continue;;
-t=*) transformarg=`echo $1 | sed 's/-t=//'`
shift
continue;;
-b=*) transformbasename=`echo $1 | sed 's/-b=//'`
shift
continue;;
*) if [ x"$src" = x ]
then
src=$1
else
# this colon is to work around a 386BSD /bin/sh bug
:
dst=$1
fi
shift
continue;;
esac
done
if [ x"$src" = x ]
then
echo "install: no input file specified"
exit 1
else
:
fi
if [ x"$dir_arg" != x ]; then
dst=$src
src=""
if [ -d $dst ]; then
instcmd=:
chmodcmd=""
else
instcmd=$mkdirprog
fi
else
# Waiting for this to be detected by the "$instcmd $src $dsttmp" command
# might cause directories to be created, which would be especially bad
# if $src (and thus $dsttmp) contains '*'.
if [ -f $src -o -d $src ]
then
:
else
echo "install: $src does not exist"
exit 1
fi
if [ x"$dst" = x ]
then
echo "install: no destination specified"
exit 1
else
:
fi
# If destination is a directory, append the input filename; if your system
# does not like double slashes in filenames, you may need to add some logic
if [ -d $dst ]
then
dst="$dst"/`basename $src`
else
:
fi
fi
## this sed command emulates the dirname command
dstdir=`echo $dst | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
# Make sure that the destination directory exists.
# this part is taken from Noah Friedman's mkinstalldirs script
# Skip lots of stat calls in the usual case.
if [ ! -d "$dstdir" ]; then
defaultIFS='
'
IFS="${IFS-${defaultIFS}}"
oIFS="${IFS}"
# Some sh's can't handle IFS=/ for some reason.
IFS='%'
set - `echo ${dstdir} | sed -e 's@/@%@g' -e 's@^%@/@'`
IFS="${oIFS}"
pathcomp=''
while [ $# -ne 0 ] ; do
pathcomp="${pathcomp}${1}"
shift
if [ ! -d "${pathcomp}" ] ;
then
$mkdirprog "${pathcomp}"
else
:
fi
pathcomp="${pathcomp}/"
done
fi
if [ x"$dir_arg" != x ]
then
$doit $instcmd $dst &&
if [ x"$chowncmd" != x ]; then $doit $chowncmd $dst; else : ; fi &&
if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd $dst; else : ; fi &&
if [ x"$stripcmd" != x ]; then $doit $stripcmd $dst; else : ; fi &&
if [ x"$chmodcmd" != x ]; then $doit $chmodcmd $dst; else : ; fi
else
# If we're going to rename the final executable, determine the name now.
if [ x"$transformarg" = x ]
then
dstfile=`basename $dst`
else
dstfile=`basename $dst $transformbasename |
sed $transformarg`$transformbasename
fi
# don't allow the sed command to completely eliminate the filename
if [ x"$dstfile" = x ]
then
dstfile=`basename $dst`
else
:
fi
# Make a temp file name in the proper directory.
dsttmp=$dstdir/#inst.$$#
# Move or copy the file name to the temp name
$doit $instcmd $src $dsttmp &&
trap "rm -f ${dsttmp}" 0 &&
# and set any options; do chmod last to preserve setuid bits
# If any of these fail, we abort the whole thing. If we want to
# ignore errors from any of these, just make sure not to ignore
# errors from the above "$doit $instcmd $src $dsttmp" command.
if [ x"$chowncmd" != x ]; then $doit $chowncmd $dsttmp; else :;fi &&
if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd $dsttmp; else :;fi &&
if [ x"$stripcmd" != x ]; then $doit $stripcmd $dsttmp; else :;fi &&
if [ x"$chmodcmd" != x ]; then $doit $chmodcmd $dsttmp; else :;fi &&
# Now rename the file to the real destination.
$doit $rmcmd -f $dstdir/$dstfile &&
$doit $mvcmd $dsttmp $dstdir/$dstfile
fi &&
exit 0

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[options]
logfile = /var/log/knockd.log
[openSSH]
sequence = 7000,8000,9000
seq_timeout = 5
command = /usr/sbin/iptables -A INPUT -s %IP% -p tcp --dport 22 -j ACCEPT
tcpflags = syn
[closeSSH]
sequence = 9000,8000,7000
seq_timeout = 5
command = /usr/sbin/iptables -D INPUT -s %IP% -p tcp --dport 22 -j ACCEPT
tcpflags = syn

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/*
* knock.c
*
* Copyright (c) 2004-2005 by Judd Vinet <jvinet@zeroflux.org>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <netdb.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <resolv.h>
#include <getopt.h>
#include <fcntl.h>
static char version[] = "0.5";
#define PROTO_TCP 1
#define PROTO_UDP 2
/* function prototypes */
void vprint(char *fmt, ...);
void ver();
void usage();
int o_verbose = 0;
int o_udp = 0;
int main(int argc, char** argv)
{
int sd;
struct hostent* host;
struct sockaddr_in addr;
int opt, optidx = 1;
static struct option opts[] =
{
{"verbose", no_argument, 0, 'v'},
{"udp", no_argument, 0, 'u'},
{"help", no_argument, 0, 'h'},
{"version", no_argument, 0, 'V'},
{0, 0, 0, 0}
};
while((opt = getopt_long(argc, argv, "vuhV", opts, &optidx))) {
if(opt < 0) {
break;
}
switch(opt) {
case 0: break;
case 'v': o_verbose = 1; break;
case 'u': o_udp = 1; break;
case 'V': ver();
case 'h': /* fallthrough */
default: usage();
}
}
if((argc - optind) < 2) {
usage();
}
host = gethostbyname(argv[optind++]);
if(host == NULL) {
fprintf(stderr, "Cannot resolve hostname\n");
exit(1);
}
for(; optind < argc; optind++) {
unsigned short port, proto = PROTO_TCP;
char *ptr, *arg = strdup(argv[optind]);
if((ptr = strchr(arg, ':'))) {
*ptr = '\0';
port = atoi(arg);
arg = ++ptr;
if(!strcmp(arg, "udp")) {
proto = PROTO_UDP;
} else {
proto = PROTO_TCP;
}
} else {
port = atoi(arg);
}
if(o_udp || proto == PROTO_UDP) {
sd = socket(PF_INET, SOCK_DGRAM, 0);
if(sd == -1) {
fprintf(stderr, "Cannot open socket\n");
exit(1);
}
} else {
int flags;
sd = socket(PF_INET, SOCK_STREAM, 0);
if(sd == -1) {
fprintf(stderr, "Cannot open socket\n");
exit(1);
}
flags = fcntl(sd, F_GETFL, 0);
fcntl(sd, F_SETFL, flags | O_NONBLOCK);
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = *((long*)host->h_addr_list[0]);
addr.sin_port = htons(port);
if(o_udp || proto == PROTO_UDP) {
vprint("hitting udp %s:%u\n", inet_ntoa(addr.sin_addr), port);
connect(sd, (struct sockaddr*)&addr, sizeof(struct sockaddr));
send(sd, NULL, 0, MSG_DONTWAIT);
} else {
vprint("hitting tcp %s:%u\n", inet_ntoa(addr.sin_addr), port);
connect(sd, (struct sockaddr*)&addr, sizeof(struct sockaddr));
}
close(sd);
}
return(0);
}
void vprint(char *fmt, ...)
{
va_list args;
if(o_verbose) {
va_start(args, fmt);
vprintf(fmt, args);
va_end(args);
fflush(stdout);
}
}
void usage() {
printf("usage: knock [options] <host> <port[:proto]> [port[:proto]] ...\n");
printf("options:\n");
printf(" -u, --udp make all ports hits use UDP (default is TCP)\n");
printf(" -v, --verbose be verbose\n");
printf(" -V, --version display version\n");
printf(" -h, --help this help\n");
printf("\n");
printf("example: knock myserver.example.com 123:tcp 456:udp 789:tcp\n");
printf("\n");
exit(1);
}
void ver() {
printf("knock %s\n", version);
printf("Copyright (C) 2004-2005 Judd Vinet <jvinet@zeroflux.org>\n");
exit(0);
}
/* vim: set ts=2 sw=2 noet: */

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/*
* list.c
*
* Copyright (c) 2002-2005 by Judd Vinet <jvinet@zeroflux.org>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "list.h"
PMList* list_new()
{
PMList *list = NULL;
list = (PMList*)malloc(sizeof(PMList));
if(list == NULL) {
return(NULL);
}
list->data = NULL;
list->prev = NULL;
list->next = NULL;
return(list);
}
void list_free(PMList *list)
{
if(list == NULL) {
return;
}
if(list->data != NULL) {
free(list->data);
list->data = NULL;
}
if(list->next != NULL) {
list_free(list->next);
}
free(list);
return;
}
PMList* list_add(PMList *list, void *data)
{
PMList *ptr, *lp;
ptr = list;
if(ptr == NULL) {
ptr = list_new();
}
lp = list_last(ptr);
if(lp == ptr && lp->data == NULL) {
/* nada */
} else {
lp->next = list_new();
if(lp->next == NULL) {
return(NULL);
}
lp->next->prev = lp;
lp = lp->next;
}
lp->data = data;
return(ptr);
}
PMList* list_remove(PMList* list, void* data)
{
PMList *ptr, *lp;
ptr = list;
for(lp = list; lp; lp = lp->next) {
if(lp->data == data) {
if(lp->prev != NULL) {
lp->prev->next = lp->next;
}
if(lp->next != NULL) {
lp->next->prev = lp->prev;
}
/* test if we just removed the head */
if(lp == ptr) {
ptr = lp->next;
}
}
}
return ptr;
}
int list_count(PMList *list)
{
int i;
PMList *lp;
for(lp = list, i = 0; lp; lp = lp->next, i++);
return(i);
}
int list_isin(PMList *haystack, void *needle)
{
PMList *lp;
for(lp = haystack; lp; lp = lp->next) {
if(lp->data == needle) {
return(1);
}
}
return(0);
}
/* Test for existence of a string in a PMList
*/
int is_in(char *needle, PMList *haystack)
{
PMList *lp;
for(lp = haystack; lp; lp = lp->next) {
if(lp->data && !strcmp(lp->data, needle)) {
return(1);
}
}
return(0);
}
/* List one is extended and returned
*/
PMList* list_merge(PMList *one, PMList *two)
{
PMList *lp, *ptr;
if(two == NULL) {
return one;
}
ptr = one;
if(ptr == NULL) {
ptr = list_new();
}
for(lp = two; lp; lp = lp->next) {
if(lp->data) {
ptr = list_add(ptr, lp->data);
lp->data = NULL;
}
}
return(ptr);
}
PMList* list_last(PMList *list)
{
PMList *ptr;
for(ptr = list; ptr && ptr->next; ptr = ptr->next);
return(ptr);
}
/* Helper function for sorting a list of strings
*/
int list_strcmp(const void *s1, const void *s2)
{
char **str1 = (char **)s1;
char **str2 = (char **)s2;
return(strcmp(*str1, *str2));
}
PMList *list_sort(PMList *list)
{
char **arr = NULL;
PMList *lp;
unsigned int arrct;
int i;
if(list == NULL) {
return(NULL);
}
arrct = list_count(list);
arr = (char **)malloc(arrct*sizeof(char*));
for(lp = list, i = 0; lp; lp = lp->next) {
arr[i++] = (char *)lp->data;
}
qsort(arr, (size_t)arrct, sizeof(char *), list_strcmp);
lp = NULL;
for(i = 0; i < arrct; i++) {
lp = list_add(lp, strdup(arr[i]));
}
if(arr) {
free(arr);
arr = NULL;
}
return(lp);
}
void list_display(const char *title, PMList *list)
{
PMList *lp;
int cols, len, maxcols = 80;
char *cenv = NULL;
cenv = getenv("COLUMNS");
if(cenv) {
maxcols = atoi(cenv);
}
len = strlen(title);
printf("%s ", title);
if(list) {
for(lp = list, cols = len; lp; lp = lp->next) {
int s = strlen((char*)lp->data)+1;
if(s+cols >= maxcols) {
int i;
cols = len;
printf("\n");
for (i = 0; i < len+1; i++) {
printf(" ");
}
}
printf("%s ", (char*)lp->data);
cols += s;
}
printf("\n");
} else {
printf("None\n");
}
}
/* vim: set ts=2 sw=2 noet: */

48
src/list.h Normal file
View File

@@ -0,0 +1,48 @@
/*
* list.h
*
* Copyright (c) 2002-2005 by Judd Vinet <jvinet@zeroflux.org>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#ifndef _PAC_LIST_H
#define _PAC_LIST_H
#define FREELIST(p) { list_free(p); p = NULL; }
/* your average linked list */
typedef struct __pmlist_t {
void* data;
struct __pmlist_t* prev;
struct __pmlist_t* next;
} PMList;
PMList* list_new();
void list_free(PMList* list);
PMList* list_add(PMList* list, void* data);
PMList* list_remove(PMList* list, void* data);
int list_count(PMList* list);
int list_isin(PMList *haystack, void *needle);
int is_in(char *needle, PMList *haystack);
PMList* list_merge(PMList *one, PMList *two);
PMList* list_last(PMList* list);
int list_strcmp(const void *s1, const void *s2);
PMList *list_sort(PMList *list);
void list_display(const char *title, PMList *list);
#endif
/* vim: set ts=2 sw=2 noet: */