knock-0.7/0000755000175000017500000000000012345524441012051 5ustar jvinetjvinetknock-0.7/README.md0000644000175000017500000000340212345524274013333 0ustar jvinetjvinet## knock: A port-knocking implementation Copyright (c) 2004, Judd Vinet ### 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. ### BUILDING To build knockd, make sure you have libpcap and the autoconf tools installed. Then run the following: $ autoreconf -fi $ ./configure --prefix=/usr/local $ make $ sudo make install ### 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 command to close port 22 to Client. ### KNOCKING CLIENTS The accompanying knock client is very basic. If you want to do more advanced knocks (eg, setting specific tcp flags) then you should take look at hping, sendip or packit. - [hping](http://freshmeat.net/projects/hping/) - [sendip](http://freshmeat.net/projects/sendip/) - [packit](http://freshmeat.net/projects/packit/) ### OTHER IMPLEMENTATIONS Here are some other implementations of port-knocking: - [pasmal](http://sourceforge.net/projects/pasmal/) - [doorman](http://doorman.sourceforge.net/) knock-0.7/TODO0000644000175000017500000000040412345524274012543 0ustar jvinetjvinet- 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 knock-0.7/ChangeLog0000644000175000017500000000574112345524274013636 0ustar jvinetjvinetVERSION DESCRIPTION ----------------------------------------------------------------------------- 0.7 - Patches from Oswald Buddenhagen: - Document the 'target' configuration directive. - Merging OS-specific networking code to reduce LOCs and the sea of #ifdefs. - Added 50ms timeout to pcap_open_live() to reduce CPU usage on network-heavy hosts. Pcap recommends we not use zero. 0.6 - Patches from Oswald Buddenhagen: - Cleanup: Don't null-check before free - Cleanup: Consolidate flag-check logic - Accept single-knock sequences - Introduce a 'target' configuration directive, enabling knockd to react to connect attempts to a target host. Useful in cases where knockd is on a router and you want to send a target a wakeup packet. 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 : - 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 : - fixes build errors on Fedora - Patch from Per Cederberg : - 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 knock-0.7/Makefile.am0000644000175000017500000000074312345524274014115 0ustar jvinetjvinetAM_CPPFLAGS=-D_BSD_SOURCE AM_CFLAGS=-g -Wall -pedantic -fno-exceptions bin_PROGRAMS = knock man_MANS = doc/knock.1 if BUILD_KNOCKD sbin_PROGRAMS = knockd man_MANS += doc/knockd.1 sysconf_DATA = knockd.conf endif dist_doc_DATA = README.md TODO ChangeLog COPYING knock_SOURCES = src/knock.c knockd_SOURCES = src/knockd.c src/list.c src/list.h %.1: %.1.in sed -e "s/#VERSION#/$(VERSION)/" $< > $@ EXTRA_DIST = doc/knock.1 doc/knock.1.in doc/knockd.1 doc/knockd.1.in knockd.conf knock-0.7/compile0000755000175000017500000001624512345524427013443 0ustar jvinetjvinet#! /bin/sh # Wrapper for compilers which do not understand '-c -o'. scriptversion=2012-10-14.11; # UTC # Copyright (C) 1999-2013 Free Software Foundation, Inc. # Written by Tom Tromey . # # 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, 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, see . # As a special exception to the GNU General Public License, if you # distribute this file as part of a program that contains a # configuration script generated by Autoconf, you may include it under # the same distribution terms that you use for the rest of that program. # This file is maintained in Automake, please report # bugs to or send patches to # . nl=' ' # We need space, tab and new line, in precisely that order. Quoting is # there to prevent tools from complaining about whitespace usage. IFS=" "" $nl" file_conv= # func_file_conv build_file lazy # Convert a $build file to $host form and store it in $file # Currently only supports Windows hosts. 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We just wanted to have am__tar # and am__untar set. test -n "${am_cv_prog_tar_$1}" && break # tar/untar a dummy directory, and stop if the command works. rm -rf conftest.dir mkdir conftest.dir echo GrepMe > conftest.dir/file AM_RUN_LOG([tardir=conftest.dir && eval $am__tar_ >conftest.tar]) rm -rf conftest.dir if test -s conftest.tar; then AM_RUN_LOG([$am__untar /dev/null 2>&1 && break fi done rm -rf conftest.dir AC_CACHE_VAL([am_cv_prog_tar_$1], [am_cv_prog_tar_$1=$_am_tool]) AC_MSG_RESULT([$am_cv_prog_tar_$1])]) AC_SUBST([am__tar]) AC_SUBST([am__untar]) ]) # _AM_PROG_TAR knock-0.7/doc/0000755000175000017500000000000012345524274012622 5ustar jvinetjvinetknock-0.7/doc/knockd.1.in0000644000175000017500000002014112345524274014560 0ustar jvinetjvinet.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 " 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 " 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% --dport 22 -j ACCEPT [closeSSH] sequence = 9000,8000,7000 seq_timeout = 10 tcpflags = syn command = /usr/sbin/iptables -D INPUT -s %IP% --dport 22 -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 = " 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 = [:],[:][,[:] ...]" 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 = " 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 "Target = " Use the specified IP address instead of the address determined for the \fBInterface\fP when matching the \fBSequence\fP. This is useful if knockd is running on a router and you want to do something in response to an actual connection attempt to a routed host - e.g., invoking etherwake to send the host a WOL packet. .TP .B "Start_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 = " Time to wait (in seconds) between \fBStart_Command\fP and \fBStop_Command\fP. This directive is optional, only required if \fBStop_Command\fP is used. .TP .B "Stop_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 .fi knock-0.7/doc/knock.1.in0000644000175000017500000000241212345524274014415 0ustar jvinetjvinet.TH knock 1 "June 26, 2005" "knockd #VERSION#" "" .SH NAME knock \- port-knock client .SH SYNOPSIS \fBknock [options] [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 "\-d , \-\-delay " Wait milliseconds between each port hit. This can be used in situations where a router mistakes your stream of SYN packets as a port scan and blocks them. If the packet rate is slowed with --delay, then the router should let the packets through. .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 .fi knock-0.7/config.h.in0000644000175000017500000000436212345524426014104 0ustar jvinetjvinet/* config.h.in. Generated from configure.ac by autoheader. */ /* Define to 1 if you have the header file. */ #undef HAVE_INTTYPES_H /* Define to 1 if you have the `pcap' library (-lpcap). */ #undef HAVE_LIBPCAP /* Define to 1 if you have the header file. */ #undef HAVE_MEMORY_H /* Define to 1 if you have the header file. */ #undef HAVE_STDINT_H /* Define to 1 if you have the header file. */ #undef HAVE_STDLIB_H /* Define to 1 if you have the header file. */ #undef HAVE_STRINGS_H /* Define to 1 if you have the header file. */ #undef HAVE_STRING_H /* Define to 1 if you have the header file. */ #undef HAVE_SYS_STAT_H /* Define to 1 if you have the header file. */ #undef HAVE_SYS_TYPES_H /* Define to 1 if you have the header file. */ #undef HAVE_UNISTD_H /* Name of package */ #undef PACKAGE /* 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 home page for this package. */ #undef PACKAGE_URL /* Define to the version of this package. */ #undef PACKAGE_VERSION /* Define to 1 if you have the ANSI C header files. */ #undef STDC_HEADERS /* Enable extensions on AIX 3, Interix. */ #ifndef _ALL_SOURCE # undef _ALL_SOURCE #endif /* Enable GNU extensions on systems that have them. */ #ifndef _GNU_SOURCE # undef _GNU_SOURCE #endif /* Enable threading extensions on Solaris. */ #ifndef _POSIX_PTHREAD_SEMANTICS # undef _POSIX_PTHREAD_SEMANTICS #endif /* Enable extensions on HP NonStop. */ #ifndef _TANDEM_SOURCE # undef _TANDEM_SOURCE #endif /* Enable general extensions on Solaris. */ #ifndef __EXTENSIONS__ # undef __EXTENSIONS__ #endif /* Version number of package */ #undef VERSION /* Define to 1 if on MINIX. */ #undef _MINIX /* Define to 2 if the system does not provide POSIX.1 features except with this defined. */ #undef _POSIX_1_SOURCE /* Define to 1 if you need to in order for `stat' and other things to work. */ #undef _POSIX_SOURCE knock-0.7/src/0000755000175000017500000000000012345524274012644 5ustar jvinetjvinetknock-0.7/src/knock.c0000644000175000017500000001052612345524274014121 0ustar jvinetjvinet/* * knock.c * * Copyright (c) 2004-2012 by Judd Vinet * * 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 #include #include #include #include #include #if defined(__FreeBSD__) || defined(__APPLE__) #include #endif #include #include #include #include #include #include #include static char version[] = "0.7"; #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 o_delay = 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'}, {"delay", required_argument, 0, 'd'}, {"help", no_argument, 0, 'h'}, {"version", no_argument, 0, 'V'}, {0, 0, 0, 0} }; while((opt = getopt_long(argc, argv, "vud:hV", opts, &optidx))) { if(opt < 0) { break; } switch(opt) { case 0: break; case 'v': o_verbose = 1; break; case 'u': o_udp = 1; break; case 'd': o_delay = (int)atoi(optarg); break; case 'V': ver(); case 'h': /* fallthrough */ default: usage(); } } if((argc - optind) < 2) { usage(); } if(o_delay < 0) { fprintf(stderr, "error: delay cannot be negative\n"); exit(1); } 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); sendto(sd, "", 1, 0, (struct sockaddr*)&addr, sizeof(addr)); } else { vprint("hitting tcp %s:%u\n", inet_ntoa(addr.sin_addr), port); connect(sd, (struct sockaddr*)&addr, sizeof(struct sockaddr)); } close(sd); usleep(1000*o_delay); } 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] [port[:proto]] ...\n"); printf("options:\n"); printf(" -u, --udp make all ports hits use UDP (default is TCP)\n"); printf(" -d, --delay wait milliseconds between port hits\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) 2004-2012 Judd Vinet \n"); exit(0); } /* vim: set ts=2 sw=2 noet: */ knock-0.7/src/list.c0000644000175000017500000001030212345524274013757 0ustar jvinetjvinet/* * list.c * * Copyright (c) 2002-2005 by Judd Vinet * * 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 #include #include #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: */ knock-0.7/src/list.h0000644000175000017500000000303112345524274013765 0ustar jvinetjvinet/* * list.h * * Copyright (c) 2002-2005 by Judd Vinet * * 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: */ knock-0.7/src/knockd.c0000644000175000017500000013361112345524274014266 0ustar jvinetjvinet/* * knockd.c * * Copyright (c) 2004-2012 by Judd Vinet * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "list.h" static char version[] = "0.7"; #define SEQ_TIMEOUT 25 /* default knock timeout in seconds */ #define CMD_TIMEOUT 10 /* default timeout in seconds between start and stop commands */ #define SEQ_MAX 32 /* maximum number of ports in a knock sequence */ typedef enum _flag_stat { DONT_CARE, /* 0 */ SET, /* 1 */ NOT_SET /* 2 */ } flag_stat; /* knock/event tuples */ typedef struct opendoor { char name[128]; unsigned short seqcount; unsigned short sequence[SEQ_MAX]; unsigned short protocol[SEQ_MAX]; char *target; time_t seq_timeout; char *start_command; time_t cmd_timeout; char *stop_command; flag_stat flag_fin; flag_stat flag_syn; flag_stat flag_rst; flag_stat flag_psh; flag_stat flag_ack; flag_stat flag_urg; FILE *one_time_sequences_fd; char *pcap_filter_exp; } opendoor_t; PMList *doors = NULL; /* we keep one list of knock attempts per IP address, * and increment the stage as they progress through the sequence. */ typedef struct knocker { opendoor_t *door; short stage; char src[16]; /* IP address */ char *srchost; /* Hostname */ time_t seq_start; } knocker_t; PMList *attempts = NULL; /* function prototypes */ void dprint(char *fmt, ...); void vprint(char *fmt, ...); void logprint(char *fmt, ...); void dprint_sequence(opendoor_t *door, char *fmt, ...); void cleanup(int signum); void child_exit(int signum); void reload(int signum); void ver(); void usage(int exit_code); char* strtoupper(char *str); char* trim(char *str); void runCommand(char *cmd); int parseconfig(char *configfile); int parse_port_sequence(char *sequence, opendoor_t *door); int get_new_one_time_sequence(opendoor_t *door); long get_next_one_time_sequence(opendoor_t *door); int disable_used_one_time_sequence(opendoor_t *door); long get_current_one_time_sequence_position(opendoor_t *door); void generate_pcap_filter(); size_t realloc_strcat(char **dest, const char *src, size_t size); void close_door(opendoor_t *door); char* get_ip(const char *iface, char *buf, int bufsize); size_t parse_cmd(char *dest, size_t size, const char *command, const char *src); int exec_cmd(char *command, char *name); void sniff(u_char *arg, const struct pcap_pkthdr *hdr, const u_char *packet); pcap_t *cap = NULL; FILE *logfd = NULL; int lltype = -1; char myip[32]; int o_usesyslog = 0; int o_verbose = 0; int o_debug = 0; int o_daemon = 0; int o_lookup = 0; char o_int[32] = ""; /* default (eth0) is set after parseconfig() */ char o_cfg[PATH_MAX] = "/etc/knockd.conf"; char o_pidfile[PATH_MAX] = "/var/run/knockd.pid"; char o_logfile[PATH_MAX] = ""; int main(int argc, char **argv) { char pcapErr[PCAP_ERRBUF_SIZE] = ""; int opt, ret, optidx = 1; static struct option opts[] = { {"verbose", no_argument, 0, 'v'}, {"debug", no_argument, 0, 'D'}, {"daemon", no_argument, 0, 'd'}, {"lookup", no_argument, 0, 'l'}, {"interface", required_argument, 0, 'i'}, {"config", required_argument, 0, 'c'}, {"help", no_argument, 0, 'h'}, {"pidfile", required_argument, 0, 'p'}, {"logfile", required_argument, 0, 'g'}, {"version", no_argument, 0, 'V'}, {0, 0, 0, 0} }; while((opt = getopt_long(argc, argv, "vDdli:c:p:g:hV", opts, &optidx))) { if(opt < 0) { break; } switch(opt) { case 0: break; case 'v': o_verbose = 1; break; case 'D': o_debug = 1; break; case 'd': o_daemon = 1; break; case 'l': o_lookup = 1; break; case 'i': strncpy(o_int, optarg, sizeof(o_int)-1); o_int[sizeof(o_int)-1] = '\0'; break; case 'c': strncpy(o_cfg, optarg, sizeof(o_cfg)-1); o_cfg[sizeof(o_cfg)-1] = '\0'; break; case 'p': strncpy(o_pidfile, optarg, sizeof(o_pidfile)-1); o_pidfile[sizeof(o_pidfile)-1] = '\0'; break; case 'g': strncpy(o_logfile, optarg, sizeof(o_logfile)-1); o_logfile[sizeof(o_logfile)-1] = '\0'; break; case 'V': ver(); case 'h': /* fallthrough */ default: usage(0); } } if(parseconfig(o_cfg)) { usage(1); } /* set o_int to a default value if it has not been set by the -i switch nor by * the config file */ if(strlen(o_int) == 0) { strncpy(o_int, "eth0", sizeof(o_int)); /* no explicit termination needed */ } if(o_usesyslog) { openlog("knockd", 0, LOG_USER); } if(strlen(o_logfile)) { /* open the log file */ logfd = fopen(o_logfile, "a"); if(logfd == NULL) { perror("warning: cannot open logfile"); } } /* 50ms timeout for packet capture. See pcap(3pcap) manpage, which * recommends that a timeout of 0 not be used. */ cap = pcap_open_live(o_int, 65535, 0, 50, pcapErr); if(strlen(pcapErr)) { fprintf(stderr, "could not open %s: %s\n", o_int, pcapErr); } if(cap == NULL) { exit(1); } lltype = pcap_datalink(cap); switch(lltype) { case DLT_EN10MB: dprint("ethernet interface detected\n"); break; case DLT_LINUX_SLL: dprint("ppp interface detected (linux \"cooked\" encapsulation)\n"); break; case DLT_RAW: dprint("raw interface detected, no encapsulation\n"); break; default: fprintf(stderr, "error: unsupported link-layer type: %d\n", lltype); cleanup(1); break; } /* get our local IP address */ if(get_ip(o_int, myip, 32) == NULL) { fprintf(stderr, "could not get IP address for %s\n", o_int); cleanup(1); } else { dprint("Local IP: %s\n", myip); } generate_pcap_filter(); if(o_daemon) { FILE *pidfp; if(daemon(0, 0) < 0) { perror("daemon"); cleanup(1); } /* write our PID to the pidfile*/ if((pidfp = fopen(o_pidfile, "w"))) { fprintf(pidfp, "%d\n", getpid()); fclose(pidfp); } else { dprint("could not create pid file %s: %s\n", o_pidfile, strerror(errno)); logprint("could not create pid file %s: %s", o_pidfile, strerror(errno)); } } signal(SIGINT, cleanup); signal(SIGTERM, cleanup); signal(SIGCHLD, child_exit); signal(SIGHUP, reload); vprint("listening on %s...\n", o_int); logprint("starting up, listening on %s", o_int); ret = 1; while(ret >= 0) { ret = pcap_dispatch(cap, -1, sniff, NULL); } dprint("bailed out of main loop! (ret=%d)\n", ret); pcap_perror(cap, "pcap"); cleanup(0); /* notreached */ exit(0); } void dprint(char *fmt, ...) { va_list args; if(o_debug) { va_start(args, fmt); vprintf(fmt, args); va_end(args); fflush(stdout); } } void vprint(char *fmt, ...) { va_list args; if(o_verbose) { va_start(args, fmt); vprintf(fmt, args); va_end(args); fflush(stdout); } } /* Output a message to syslog and/or a logfile */ void logprint(char *fmt, ...) { char msg[1024]; va_list args; va_start(args, fmt); vsnprintf(msg, 1024, fmt, args); va_end(args); if(o_usesyslog) { syslog(LOG_NOTICE, "%s", msg); } if(logfd) { time_t t; struct tm *tm; t = time(NULL); tm = localtime(&t); fprintf(logfd, "[%04d-%02d-%02d %02d:%02d] %s\n", tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday, tm->tm_hour, tm->tm_min, msg); fflush(logfd); } } /* Output current sequence of door for debugging */ void dprint_sequence(opendoor_t *door, char *fmt, ...) { va_list args; int i; if(o_debug) { va_start(args, fmt); vprintf(fmt, args); va_end(args); for(i = 0; i < door->seqcount; i++) { switch(door->protocol[i]){ case IPPROTO_UDP: printf((i == door->seqcount-1 ? "%u:udp\n" : "%u:udp,"), door->sequence[i]); break; case IPPROTO_TCP: /* fallthrough */ default: printf((i == door->seqcount-1 ? "%u:tcp\n" : "%u:tcp,"), door->sequence[i]); } } fflush(stdout); } } /* Signal handlers */ void cleanup(int signum) { int status; vprint("waiting for child processes...\n"); logprint("waiting for child processes..."); wait(&status); vprint("closing...\n"); logprint("shutting down"); pcap_close(cap); if(o_daemon) { unlink(o_pidfile); } exit(signum); } void child_exit(int signum) { /* child wants to exit, let em die */ wait(NULL); return; } void reload(int signum) { PMList *lp; opendoor_t *door; vprint("Re-reading config file: %s\n", o_cfg); logprint("Re-reading config file: %s\n", o_cfg); for(lp = doors; lp; lp = lp->next) { door = (opendoor_t*)lp->data; close_door(door); } list_free(doors); parseconfig(o_cfg); vprint("Closing and re-opening log file: %s\n", o_logfile); logprint("Closing and re-opening log file: %s\n", o_logfile); /* close and re-open the log file */ if(logfd) { fclose(logfd); } logfd = fopen(o_logfile, "a"); if(logfd == NULL) { perror("warning: cannot open logfile"); } return; } void usage(int exit_code) { printf("usage: knockd [options]\n"); printf("options:\n"); printf(" -i, --interface network interface to listen on (default \"eth0\")\n"); printf(" -d, --daemon run as a daemon\n"); printf(" -c, --config use an alternate config file\n"); printf(" -D, --debug output debug messages\n"); printf(" -l, --lookup lookup DNS names (may be a security risk)\n"); printf(" -p, --pidfile use an alternate pidfile\n"); printf(" -g, --logfile use an alternate logfile\n"); printf(" -v, --verbose be verbose\n"); printf(" -V, --version display version\n"); printf(" -h, --help this help\n"); printf("\n"); exit(exit_code); } void ver() { printf("knockd %s\n", version); printf("Copyright (C) 2004-2012 Judd Vinet \n"); exit(0); } /* Convert a string to uppercase */ char* strtoupper(char *str) { char *ptr = str; while(*ptr) { (*ptr) = toupper(*ptr); ptr++; } return str; } /* Trim whitespace and newlines from a string */ char* trim(char *str) { char *pch = str; while(isspace(*pch)) { pch++; } if(pch != str) { memmove(str, pch, (strlen(pch) + 1)); } pch = (char*)(str + (strlen(str) - 1)); while(isspace(*pch)) { pch--; } *++pch = '\0'; return str; } /* Parse a config file */ int parseconfig(char *configfile) { FILE *fp = NULL; char line[PATH_MAX+1]; char *ptr = NULL; char *key = NULL; int linenum = 0; char section[256] = ""; opendoor_t *door = NULL; PMList *lp; if((fp = fopen(configfile, "r")) == NULL) { perror(configfile); return(1); } while(fgets(line, PATH_MAX, fp)) { linenum++; trim(line); if(strlen(line) == 0 || line[0] == '#') { continue; } if(line[0] == '[' && line[strlen(line)-1] == ']') { /* new config section */ ptr = line; ptr++; strncpy(section, ptr, sizeof(section)); section[strlen(section)-1] = '\0'; dprint("config: new section: '%s'\n", section); if(!strlen(section)) { fprintf(stderr, "config: line %d: bad section name\n", linenum); return(1); } if(strcmp(section, "options")) { /* start a new knock/event record */ door = malloc(sizeof(opendoor_t)); if(door == NULL) { perror("malloc"); exit(1); } strncpy(door->name, section, sizeof(door->name)-1); door->name[sizeof(door->name)-1] = '\0'; door->target = 0; door->seqcount = 0; door->seq_timeout = SEQ_TIMEOUT; /* default sequence timeout (seconds) */ door->start_command = NULL; door->cmd_timeout = CMD_TIMEOUT; /* default command timeout (seconds) */ door->stop_command = NULL; door->one_time_sequences_fd = NULL; door->pcap_filter_exp = NULL; doors = list_add(doors, door); } } else { /* directive */ if(!strlen(section)) { fprintf(stderr, "config: line %d: all directives must belong to a section\n", linenum); return(1); } ptr = line; key = strsep(&ptr, "="); if(key == NULL) { fprintf(stderr, "config: line %d: syntax error\n", linenum); return(1); } trim(key); key = strtoupper(key); if(ptr == NULL) { if(!strcmp(key, "USESYSLOG")) { o_usesyslog = 1; dprint("config: usesyslog\n"); } else { fprintf(stderr, "config: line %d: syntax error\n", linenum); return(1); } } else { trim(ptr); if(!strcmp(section, "options")) { if(!strcmp(key, "LOGFILE")) { strncpy(o_logfile, ptr, PATH_MAX-1); o_logfile[PATH_MAX-1] = '\0'; dprint("config: log file: %s\n", o_logfile); } else if(!strcmp(key, "PIDFILE")) { strncpy(o_pidfile, ptr, PATH_MAX-1); o_pidfile[PATH_MAX-1] = '\0'; dprint("config: pid file: %s\n", o_pidfile); } else if(!strcmp(key, "INTERFACE")) { /* set interface only if it has not already been set by the -i switch */ if(strlen(o_int) == 0) { strncpy(o_int, ptr, sizeof(o_int)-1); o_int[sizeof(o_int)-1] = '\0'; dprint("config: interface: %s\n", o_int); } } else { fprintf(stderr, "config: line %d: syntax error\n", linenum); return(1); } } else { if(door == NULL) { fprintf(stderr, "config: line %d: \"%s\" can only be used within a Door section\n", linenum, key); return(1); } if(!strcmp(key, "TARGET")) { door->target = malloc(sizeof(char) * (strlen(ptr)+1)); if(door->target == NULL) { perror("malloc"); exit(1); } strcpy(door->target, ptr); dprint("config: %s: target: %s\n", door->name, door->target); } else if(!strcmp(key, "SEQUENCE")) { int i; i = parse_port_sequence(ptr, door); if (i > 0) { return(i); } dprint_sequence(door, "config: %s: sequence: ", door->name); } else if(!strcmp(key, "ONE_TIME_SEQUENCES")) { if((door->one_time_sequences_fd = fopen(ptr, "r+")) == NULL) { perror(ptr); return(1); } dprint("config: %s: one time sequences file: %s\n", door->name, ptr); if (get_new_one_time_sequence(door) == 0) { dprint_sequence(door, "config: %s: sequence: ", door->name); } else { /* no more sequences left in the one time sequences file */ dprint("config: no more sequences left in the one time sequences file %s\n", ptr); return(1); } } else if(!strcmp(key, "SEQ_TIMEOUT") || !strcmp(key, "TIMEOUT")) { door->seq_timeout = (time_t)atoi(ptr); dprint("config: %s: seq_timeout: %d\n", door->name, door->seq_timeout); } else if(!strcmp(key, "START_COMMAND") || !strcmp(key, "COMMAND")) { door->start_command = malloc(sizeof(char) * (strlen(ptr)+1)); if(door->start_command == NULL) { perror("malloc"); exit(1); } strcpy(door->start_command, ptr); dprint("config: %s: start_command: %s\n", door->name, door->start_command); } else if(!strcmp(key, "CMD_TIMEOUT")) { door->cmd_timeout = (time_t)atoi(ptr); dprint("config: %s: cmd_timeout: %d\n", door->name, door->cmd_timeout); } else if(!strcmp(key, "STOP_COMMAND")) { door->stop_command = malloc(sizeof(char) * (strlen(ptr)+1)); if(door->stop_command == NULL) { perror("malloc"); exit(1); } strcpy(door->stop_command, ptr); dprint("config: %s: stop_command: %s\n", door->name, door->stop_command); } else if(!strcmp(key, "TCPFLAGS")) { char *flag; strtoupper(ptr); while((flag = strsep(&ptr, ","))) { /* allow just some flags to be specified */ if(!strcmp(flag,"FIN")) { door->flag_fin = SET; } else if(!strcmp(flag,"!FIN")) { door->flag_fin = NOT_SET; } else if(!strcmp(flag, "SYN")) { door->flag_syn = SET; } else if(!strcmp(flag, "!SYN")) { door->flag_syn = NOT_SET; } else if(!strcmp(flag, "RST")) { door->flag_rst = SET; } else if(!strcmp(flag, "!RST")) { door->flag_rst = NOT_SET; } else if(!strcmp(flag, "PSH")) { door->flag_psh = SET; } else if(!strcmp(flag, "!PSH")) { door->flag_psh = NOT_SET; } else if(!strcmp(flag, "ACK")) { door->flag_ack = SET; } else if(!strcmp(flag, "!ACK")) { door->flag_ack = NOT_SET; } else if(!strcmp(flag, "URG")) { door->flag_urg = SET; } else if(!strcmp(flag, "!URG")) { door->flag_urg = NOT_SET; } else { fprintf(stderr, "config: line %d: unrecognized flag \"%s\"\n", linenum, flag); return(1); } dprint("config: tcp flag: %s\n", flag); } } else { fprintf(stderr, "config: line %d: syntax error\n", linenum); return(1); } } line[0] = '\0'; } } } fclose(fp); /* sanity checks */ for(lp = doors; lp; lp = lp->next) { door = (opendoor_t*)lp->data; if(door->seqcount == 0) { fprintf(stderr, "error: section '%s' has an empty knock sequence\n", door->name); return(1); } } return(0); } /* Parse a port:protocol sequence. Returns a positive integer on error. */ int parse_port_sequence(char *sequence, opendoor_t *door) { char *num; char *protocol; char *port; door->seqcount = 0; /* reset seqcount */ while((num = strsep(&sequence, ","))) { if(door->seqcount >= SEQ_MAX) { fprintf(stderr, "config: section %s: too many ports in knock sequence\n", door->name); logprint("error: section %s: too many ports in knock sequence\n", door->name); return(1); } port = strsep(&num, ":"); door->sequence[door->seqcount++] = (unsigned short)atoi(port); if((protocol = strsep(&num, ":"))){ protocol = strtoupper(trim(protocol)); if(!strcmp(protocol, "TCP")){ door->protocol[door->seqcount-1] = IPPROTO_TCP; } else if(!strcmp(protocol, "UDP")) { door->protocol[door->seqcount-1] = IPPROTO_UDP; } else { fprintf(stderr,"config: section %s: unknown protocol in knock sequence\n", door->name); logprint("error: section %s: unknown protocol in knock sequence\n", door->name); return(1); } } else { door->protocol[door->seqcount-1] = IPPROTO_TCP; /* default protocol */ } } return(0); } /* Read a new sequence from the one time sequences file and update the door. */ int get_new_one_time_sequence(opendoor_t *door) { rewind(door->one_time_sequences_fd); if(get_next_one_time_sequence(door) < 0) { /* disable the door by removing it from the doors list if there are no sequences anymore */ fprintf(stderr, "no more sequences left in the one time sequences file for door %s --> disabling the door\n", door->name); logprint("no more sequences left in the one time sequences file for door %s --> disabling the door\n", door->name); close_door(door); return(1); } dprint_sequence(door, "new sequence for door %s: ", door->name); return(0); } /* Search from the current position in the one time sequence file for the next * valid sequence and insert it into the door structure. Returns the position of * the beginning of the found line within the file or a negative value if no * valid sequence has been found. */ long get_next_one_time_sequence(opendoor_t *door) { char line[PATH_MAX+1]; int pos; pos = ftell(door->one_time_sequences_fd); while(fgets(line, PATH_MAX, door->one_time_sequences_fd)) { trim(line); if(strlen(line) == 0 || line[0] == '#') { pos = ftell(door->one_time_sequences_fd); continue; } if(parse_port_sequence(line, door) > 0) { /* continue searching if parse_port_sequnce returned with an error */ continue; } return(pos); } /* no valid line found */ return(-1); } /* Remove a one time sequence from the corresponding file (after a successful * knock attempt) */ int disable_used_one_time_sequence(opendoor_t *door) { long pos = get_current_one_time_sequence_position(door); if(pos >= 0) { if(fseek(door->one_time_sequences_fd, pos, SEEK_SET) < 0) { fprintf(stderr, "error while disabling used one time sequence for door %s --> disabling the door\n", door->name); logprint("error while disabling used one time sequence for door %s --> disabling the door\n", door->name); close_door(door); return(1); } if(fputc('#', door->one_time_sequences_fd) == EOF) { fprintf(stderr, "error while disabling used one time sequence for door %s --> disabling the door\n", door->name); logprint("error while disabling used one time sequence for door %s --> disabling the door\n", door->name); close_door(door); return(1); } } return(0); } /* Get the position (beginning of line) in the one time sequence file of the * current sequence such that we know where to insert a '#' to disable the * sequence in the one time sequence file */ long get_current_one_time_sequence_position(opendoor_t *door) { opendoor_t pseudo_door; /* used to compare sequences in the file and the current sequence in door */ long pos; rewind(door->one_time_sequences_fd); pseudo_door.one_time_sequences_fd = door->one_time_sequences_fd; pos = get_next_one_time_sequence(&pseudo_door); while(pos >= 0) { if(door->seqcount == pseudo_door.seqcount) { if((memcmp((void*) door->sequence, (void*) pseudo_door.sequence, door->seqcount) == 0) && (memcmp((void*) door->protocol, (void*) pseudo_door.protocol, door->seqcount) == 0)) { return(pos); } } pos = get_next_one_time_sequence(&pseudo_door); } return(-1); } /* Generate and set the filter for pcap. That way only the relevant packets will * be forwarded to us (in sniff()). Note that generate_pcap_filter() will first * generate a subfilter (=substring of the whole filter string) for each door if * door->pcap_filter_exp is NULL. This behaviour can be used for doors with one * time sequences, where the subfilter has to be generated after each sequence. */ void generate_pcap_filter() { PMList *lp; opendoor_t *door; char *buffer = NULL; /* temporary buffer to create the individual filter strings */ size_t bufsize = 0; /* size of buffer */ char port_str[10]; /* used by snprintf to convert unsigned short --> string */ short head_set = 0; /* flag indicating if protocol head is set (i.e. "((tcp dst port") */ short tcp_present = 0; /* flag indicating if TCP is used */ short udp_present = 0; /* flag indicating if UDP is used */ unsigned int i; short modified_filters = 0; /* flag indicating if at least one filter has changed --> recompile the filter */ struct bpf_program bpf_prog; /* compiled BPF filter program */ /* generate subfilters for each door having a NULL pcap_filter_exp * * Example filter for one single door: * ((tcp dst port 8000 or 8001 or 8002) and tcp[tcpflags] & tcp-syn != 0) or (udp dst port 4000 or 4001) */ for(lp = doors; lp; lp = lp->next) { door = (opendoor_t*)lp->data; if(door->pcap_filter_exp != NULL) { continue; } /* if we get here at least one door had a pcap_filter_exp == NULL */ modified_filters = 1; head_set = 0; tcp_present = 0; udp_present = 0; /* allocate memory for buffer if needed. * The first allocation will be 200 Bytes (should be large enough for common sequences). If there is * not enough space, a call to realloc_strcat() will eventually increase its size. The buffer will be * reused for successive doors */ if(buffer == NULL) { bufsize = 200; buffer = (char*)malloc(sizeof(char) * bufsize); if(buffer == NULL) { perror("malloc"); cleanup(1); } buffer[0] = '\0'; } bufsize = realloc_strcat(&buffer, "(dst host ", bufsize); /* accept only incoming packets */ bufsize = realloc_strcat(&buffer, door->target ? door->target : myip, bufsize); bufsize = realloc_strcat(&buffer, " and (", bufsize); /* generate filter for all TCP ports (i.e. "((tcp dst port 4000 or 4001 or 4002) and tcp[tcpflags] & tcp-syn != 0)" */ for(i = 0; i < door->seqcount; i++) { if(door->protocol[i] == IPPROTO_TCP) { if(!head_set) { /* first TCP port in the sequence */ bufsize = realloc_strcat(&buffer, "((tcp dst port ", bufsize); head_set = 1; tcp_present = 1; } else { /* not the first TCP port in the sequence */ bufsize = realloc_strcat(&buffer, " or ", bufsize); } snprintf(port_str, sizeof(port_str), "%hu", door->sequence[i]); /* unsigned short to string */ bufsize = realloc_strcat(&buffer, port_str, bufsize); /* append port number */ } } if(tcp_present) { bufsize = realloc_strcat(&buffer, ")", bufsize); /* close parentheses of TCP ports */ } /* append the TCP flag filters */ if(tcp_present) { if(door->flag_fin != DONT_CARE) { bufsize = realloc_strcat(&buffer, " and tcp[tcpflags] & tcp-fin ", bufsize); if(door->flag_fin == SET) { bufsize = realloc_strcat(&buffer, "!= 0", bufsize); } if(door->flag_fin == NOT_SET) { bufsize = realloc_strcat(&buffer, "== 0", bufsize); } } if(door->flag_syn != DONT_CARE) { bufsize = realloc_strcat(&buffer, " and tcp[tcpflags] & tcp-syn ", bufsize); if(door->flag_syn == SET) { bufsize = realloc_strcat(&buffer, "!= 0", bufsize); } if(door->flag_syn == NOT_SET) { bufsize = realloc_strcat(&buffer, "== 0", bufsize); } } if(door->flag_rst != DONT_CARE) { bufsize = realloc_strcat(&buffer, " and tcp[tcpflags] & tcp-rst ", bufsize); if(door->flag_rst == SET) { bufsize = realloc_strcat(&buffer, "!= 0", bufsize); } if(door->flag_rst == NOT_SET) { bufsize = realloc_strcat(&buffer, "== 0", bufsize); } } if(door->flag_psh != DONT_CARE) { bufsize = realloc_strcat(&buffer, " and tcp[tcpflags] & tcp-psh ", bufsize); if(door->flag_psh == SET) { bufsize = realloc_strcat(&buffer, "!= 0", bufsize); } if(door->flag_psh == NOT_SET) { bufsize = realloc_strcat(&buffer, "== 0", bufsize); } } if(door->flag_ack != DONT_CARE) { bufsize = realloc_strcat(&buffer, " and tcp[tcpflags] & tcp-ack ", bufsize); if(door->flag_ack == SET) { bufsize = realloc_strcat(&buffer, "!= 0", bufsize); } if(door->flag_ack == NOT_SET) { bufsize = realloc_strcat(&buffer, "== 0", bufsize); } } if(door->flag_urg != DONT_CARE) { bufsize = realloc_strcat(&buffer, " and tcp[tcpflags] & tcp-urg ", bufsize); if(door->flag_urg == SET) { bufsize = realloc_strcat(&buffer, "!= 0", bufsize); } if(door->flag_urg == NOT_SET) { bufsize = realloc_strcat(&buffer, "== 0", bufsize); } } bufsize = realloc_strcat(&buffer, ")", bufsize); /* close parentheses of flags */ } /* append filter for all UDP ports (i.e. "(udp dst port 6543 or 6544 or 6545)" */ head_set = 0; for(i = 0; i < door->seqcount; i++) { if(door->protocol[i] == IPPROTO_UDP) { if(!head_set) { /* first UDP port in the sequence */ if(tcp_present) { bufsize = realloc_strcat(&buffer, " or ", bufsize); } bufsize = realloc_strcat(&buffer, "(udp dst port ", bufsize); head_set = 1; udp_present = 1; } else { /* not the first UDP port in the sequence */ bufsize = realloc_strcat(&buffer, " or ", bufsize); } snprintf(port_str, sizeof(port_str), "%hu", door->sequence[i]); /* unsigned short to string */ bufsize = realloc_strcat(&buffer, port_str, bufsize); /* append port number */ } } if(udp_present) { bufsize = realloc_strcat(&buffer, ")", bufsize); /* close parentheses of UDP ports */ } bufsize = realloc_strcat(&buffer, "))", bufsize); /* close parantheses around port filters */ /* test if in any of the precedent calls to realloc_strcat() failed. We can do this safely here because * realloc_strcat() returns 0 on failure and if a buffer size of 0 is passed to it, the function does * nothing but returning 0 again. Because we never read buffer in the above code, it is secure to test * for failure only at this point (it makes the code more readable than checking for failure each time * realloc_strcat() is called). */ if(bufsize == 0) { perror("realloc"); cleanup(1); } /* allocate the buffer in door holding the filter string, copy it and prepare buffer for being reused. */ door->pcap_filter_exp = (char*)malloc(strlen(buffer) + 1); if(door->pcap_filter_exp == NULL) { perror("malloc"); cleanup(1); } strcpy(door->pcap_filter_exp, buffer); dprint("Adding pcap expression for door '%s': %s\n", door->name, door->pcap_filter_exp); buffer[0] = '\0'; /* "clear" the buffer */ } /* generate the whole pcap filter string if a filter had been modified. Reuse buffer (already "cleared"). * * Note that we don't check if a port is included in multiple doors, we simply concatenate the individual door * filters and rely on pcap's optimization capabilities. * * Example filter for two doors with sequences 8000:tcp,4000:udp,8001:tcp,4001:udp,8002:tcp (syn) and * 1234:tcp,4567:tcp,8901:tcp (syn,ack) : * dst host the.hosts.ip.address and ( * ((tcp dst port 8000 or 8001 or 8002) and tcp[tcpflags] & tcp-syn != 0) or (udp dst port 4000 or 4001) * or ((tcp dst port 1234 or 4567 or 8901) and tcp[tcpflags] & tcp-syn != 0 and tcp[tcpflags] & tcp-ack != 0) * ) */ if(modified_filters) { /* iterate over all doors */ for(lp = doors; lp; lp = lp->next) { door = (opendoor_t*)lp->data; bufsize = realloc_strcat(&buffer, door->pcap_filter_exp, bufsize); if(lp->next != NULL) { bufsize = realloc_strcat(&buffer, " or ", bufsize); } } /* test if in any of the precedent calls to realloc_strcat() failed. See above why this is ok to do this only * at this point */ if(bufsize == 0) { perror("realloc"); cleanup(1); } if(pcap_compile(cap, &bpf_prog, buffer, 1, 0) < 0) { /* optimize filter (1), no netmask (0) (we're not interested in broadcasts) */ pcap_perror(cap, "pcap"); cleanup(1); } if(pcap_setfilter(cap, &bpf_prog) < 0) { pcap_perror(cap, "pcap"); cleanup(1); } pcap_freecode(&bpf_prog); free(buffer); } } /* Reallocating strcat -- appends the src string to the dest string (pointer to * char*!) overwriting the `\0' character at the end of dest, and then adds a * terminating `\0' character. size is the whole size of the dest buffer (not * the remaining space like in strncat). If there is not enough space to append * src, the dest buffer will be realloc()ated to hold the src string. The * reallocation is done by doubling dest's size until it is large enough. dest * will always be NULL terminated. Returns the size of the whole buffer or 0 if * realloc() fails. * * IMPORTANT: dest has to be an allocated buffer (not static!), such that it can * be reallocated with realloc() !!! */ size_t realloc_strcat(char **dest, const char *src, size_t size) { size_t needed_size; size_t new_size; if(size == 0) { return 0; } needed_size = strlen(*dest) + strlen(src) + 1; /* '+ 1' for '\0' */ new_size = size; while(needed_size > new_size) { new_size *= 2; } if(new_size != size) { *dest = (char*)realloc(*dest, new_size); if(*dest == NULL) { return 0; } } /* now dest is large enough to strcat() the src */ strcat(*dest, src); return new_size; } /* Disable the door by removing it from the doors list and free all allocated memory. */ void close_door(opendoor_t *door) { doors = list_remove(doors, door); if(door) { free(door->target); free(door->start_command); free(door->stop_command); if (door->one_time_sequences_fd) { fclose(door->one_time_sequences_fd); } free(door->pcap_filter_exp); free(door); } } /* Get the IP address of an interface */ char* get_ip(const char* iface, char *buf, int bufsize) { int s; struct ifreq ifr; if(bufsize <= 0) { return(NULL); } if(buf == NULL) { return(NULL); } buf[0] = '\0'; s = socket(AF_INET, SOCK_DGRAM, 0); if(s < 0) { return(NULL); } bzero((void*)(&ifr.ifr_name), sizeof(ifr.ifr_name)); strncpy(ifr.ifr_name, iface, sizeof(ifr.ifr_name)-1); ifr.ifr_name[sizeof(ifr.ifr_name)-1] = '\0'; if(ioctl(s, SIOCGIFADDR, &ifr)) { close(s); return(NULL); } close(s); strncpy(buf, inet_ntoa((*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr), bufsize-1); buf[bufsize-1] = '\0'; return(buf); } /* Parse a command line, replacing tokens (eg, %IP%) with their real values and * copy the result to dest. At most size-1 characters will be copied and the * result will always be NULL terminated (except if size == 0). The return value * is the length of the resulting string. If the returned size is larger than the * size of dest, then the result has ben truncated. */ size_t parse_cmd(char* dest, size_t size, const char* command, const char* src) { char *d = dest; const char *c = command; const char *s = src; char *token; size_t n = size; size_t command_len = strlen(command); size_t total_len = 0; /* allows us to calculate total length of result string even if the size */ /* is zero by setting n to 1 (--> noting will be ever written to dest) */ int size_larger_than_zero = 1; if(size == 0) { size_larger_than_zero = 0; n = 1; } /* get location of first token */ token = strstr(c, "%IP%"); if(!token) { /* point token past command (we won't access it anymore) */ token = (char*) (c + command_len + 1); } while(*c != '\0') { /* not reached a token yet --> append from command */ if(c < token) { if(n != 1) { *d++ = *c; n--; } } else { /* we reached a token --> append from src */ while(*s != '\0') { if(n != 1) { *d++ = *s; n--; } s++; total_len++; } c += 4; /* skip the token in command */ s = src; /* "rewind" src string for next token */ token = strstr(c, "%IP%"); /* get location of next token */ if(!token) { /* point token past command (we won't access it anymore) */ token = (char*) (c + command_len + 1); } c--; /* compensate for the following c++ */ total_len--; /* compensate for the following total_len++ */ } c++; total_len++; } if(size_larger_than_zero) { /* terminate dest if its size is larger than 0 */ *d = '\0'; } return(total_len); } /* Execute a command through the system shell and wait for return */ int exec_cmd(char* command, char* name){ int ret; logprint("%s: running command: %s\n", name, command); vprint("%s: running command: %s\n", name, command); ret = system(command); if(ret == -1) { fprintf(stderr, "error: command fork failed!\n"); logprint("error: command fork failed!"); } else if(ret != 0) { fprintf(stderr, "%s: command returned non-zero status code (%d)\n", name, WEXITSTATUS(ret)); logprint("%s: command returned non-zero status code (%d)", name, WEXITSTATUS(ret)); } return ret; } /* * If examining a TCP packet, try to match flags against those in * the door config. */ int flags_match(opendoor_t* door, struct ip* ip, struct tcphdr* tcp) { /* if tcp, check the flags to ignore the packets we don't want * (don't even use it to cancel sequences) */ if(ip->ip_p == IPPROTO_TCP) { if(door->flag_fin != DONT_CARE) { if(door->flag_fin == SET && !(tcp->th_flags & TH_FIN)) { dprint("packet is not FIN, ignoring...\n"); return 0; } if(door->flag_fin == NOT_SET && (tcp->th_flags & TH_FIN)) { dprint("packet is not !FIN, ignoring...\n"); return 0; } } if(door->flag_syn != DONT_CARE) { if(door->flag_syn == SET && !(tcp->th_flags & TH_SYN)) { dprint("packet is not SYN, ignoring...\n"); return 0; } if(door->flag_syn == NOT_SET && (tcp->th_flags & TH_SYN)) { dprint("packet is not !SYN, ignoring...\n"); return 0; } } if(door->flag_rst != DONT_CARE) { if(door->flag_rst == SET && !(tcp->th_flags & TH_RST)) { dprint("packet is not RST, ignoring...\n"); return 0; } if(door->flag_rst == NOT_SET && (tcp->th_flags & TH_RST)) { dprint("packet is not !RST, ignoring...\n"); return 0; } } if(door->flag_psh != DONT_CARE) { if(door->flag_psh == SET && !(tcp->th_flags & TH_PUSH)) { dprint("packet is not PSH, ignoring...\n"); return 0; } if(door->flag_psh == NOT_SET && (tcp->th_flags & TH_PUSH)) { dprint("packet is not !PSH, ignoring...\n"); return 0; } } if(door->flag_ack != DONT_CARE) { if(door->flag_ack == SET && !(tcp->th_flags & TH_ACK)) { dprint("packet is not ACK, ignoring...\n"); return 0; } if(door->flag_ack == NOT_SET && !(tcp->th_flags & TH_ACK)) { dprint("packet is not !ACK, ignoring...\n"); return 0; } } if(door->flag_urg != DONT_CARE) { if(door->flag_urg == SET && !(tcp->th_flags & TH_URG)) { dprint("packet is not URG, ignoring...\n"); return 0; } if(door->flag_urg == NOT_SET && !(tcp->th_flags & TH_URG)) { dprint("packet is not !URG, ignoring...\n"); return 0; } } } return 1; } /** * Process a knock attempt to see if the knocker has graduated to the next * sequence. If they've completed all sequences correctly, then we open the * door. */ void process_attempt(knocker_t *attempt) { /* level up! */ attempt->stage++; if(attempt->srchost) { vprint("%s (%s): %s: Stage %d\n", attempt->src, attempt->srchost, attempt->door->name, attempt->stage); logprint("%s (%s): %s: Stage %d", attempt->src, attempt->srchost, attempt->door->name, attempt->stage); } else { vprint("%s: %s: Stage %d\n", attempt->src, attempt->door->name, attempt->stage); logprint("%s: %s: Stage %d", attempt->src, attempt->door->name, attempt->stage); } if(attempt->stage >= attempt->door->seqcount) { if(attempt->srchost) { vprint("%s (%s): %s: OPEN SESAME\n", attempt->src, attempt->srchost, attempt->door->name); logprint("%s (%s): %s: OPEN SESAME", attempt->src, attempt->srchost, attempt->door->name); } else { vprint("%s: %s: OPEN SESAME\n", attempt->src, attempt->door->name); logprint("%s: %s: OPEN SESAME", attempt->src, attempt->door->name); } if(attempt->door->start_command && strlen(attempt->door->start_command)) { /* run the associated command */ if(fork() == 0) { /* child */ char parsed_start_cmd[PATH_MAX]; char parsed_stop_cmd[PATH_MAX]; size_t cmd_len = 0; setsid(); /* parse start and stop command and check if the parsed commands fit in the given buffer. Don't * execute any command if one of them has been truncated */ cmd_len = parse_cmd(parsed_start_cmd, sizeof(parsed_start_cmd), attempt->door->start_command, attempt->src); if(cmd_len >= sizeof(parsed_start_cmd)) { /* command has been truncated --> do NOT execute it */ fprintf(stderr, "error: parsed start command has been truncated! --> won't execute it\n"); logprint("error: parsed start command has been truncated! --> won't execute it"); exit(0); /* exit child */ } if(attempt->door->stop_command) { cmd_len = parse_cmd(parsed_stop_cmd, sizeof(parsed_stop_cmd), attempt->door->stop_command, attempt->src); if(cmd_len >= sizeof(parsed_stop_cmd)) { /* command has been truncated --> do NOT execute it */ fprintf(stderr, "error: parsed stop command has been truncated! --> won't execute start command\n"); logprint("error: parsed stop command has been truncated! --> won't execute start command"); exit(0); /* exit child */ } } /* all parsing ok --> execute the parsed (%IP% = source IP) command */ exec_cmd(parsed_start_cmd, attempt->door->name); /* if stop_command is set, sleep for cmd_timeout and run it*/ if(attempt->door->stop_command){ sleep(attempt->door->cmd_timeout); if(attempt->srchost) { vprint("%s (%s): %s: command timeout\n", attempt->src, attempt->srchost, attempt->door->name); logprint("%s (%s): %s: command timeout", attempt->src, attempt->srchost, attempt->door->name); } else { vprint("%s: %s: command timeout\n", attempt->src, attempt->door->name); logprint("%s: %s: command timeout", attempt->src, attempt->door->name); } exec_cmd(parsed_stop_cmd, attempt->door->name); } exit(0); /* exit child */ } } /* change to next sequence if one time sequences are used. * Note that here the door will eventually be closed in * get_new_one_time_sequence() if no more sequences are left */ if(attempt->door->one_time_sequences_fd) { disable_used_one_time_sequence(attempt->door); get_new_one_time_sequence(attempt->door); /* update pcap filter */ free(attempt->door->pcap_filter_exp); attempt->door->pcap_filter_exp = NULL; generate_pcap_filter(); } } } /* Sniff an interface, looking for port-knock sequences */ void sniff(u_char* arg, const struct pcap_pkthdr* hdr, const u_char* packet) { /* packet structs */ struct ether_header* eth = NULL; struct ip* ip = NULL; struct tcphdr* tcp = NULL; struct udphdr* udp = NULL; char proto[8]; /* TCP/IP data */ struct in_addr inaddr; unsigned short sport, dport; char srcIP[16], dstIP[16]; /* timestamp */ time_t pkt_secs = hdr->ts.tv_sec; struct tm* pkt_tm; char pkt_date[11]; char pkt_time[9]; PMList *lp; knocker_t *attempt = NULL; if(lltype == DLT_EN10MB) { eth = (struct ether_header*)packet; if(ntohs(eth->ether_type) != ETHERTYPE_IP) { return; } ip = (struct ip*)(packet + sizeof(struct ether_header)); #ifdef __linux__ } else if(lltype == DLT_LINUX_SLL) { ip = (struct ip*)((u_char*)packet + 16); #endif } else if(lltype == DLT_RAW) { ip = (struct ip*)((u_char*)packet); } else { dprint("link layer header type of packet not recognized, ignoring...\n"); return; } if(ip->ip_v != 4) { /* no IPv6 yet */ dprint("packet is not IPv4, ignoring...\n"); return; } if(ip->ip_p == IPPROTO_ICMP) { /* we don't do ICMP */ return; } sport = dport = 0; if(ip->ip_p == IPPROTO_TCP) { strncpy(proto, "tcp", sizeof(proto)); tcp = (struct tcphdr*)((u_char*)ip + (ip->ip_hl *4)); sport = ntohs(tcp->th_sport); dport = ntohs(tcp->th_dport); } if(ip->ip_p == IPPROTO_UDP) { strncpy(proto, "udp", sizeof(proto)); udp = (struct udphdr*)((u_char*)ip + (ip->ip_hl * 4)); sport = ntohs(udp->uh_sport); dport = ntohs(udp->uh_dport); } /* get the date/time */ pkt_tm = localtime(&pkt_secs); snprintf(pkt_date, 11, "%04d-%02d-%02d", pkt_tm->tm_year+1900, pkt_tm->tm_mon, pkt_tm->tm_mday); snprintf(pkt_time, 9, "%02d:%02d:%02d", pkt_tm->tm_hour, pkt_tm->tm_min, pkt_tm->tm_sec); /* convert IPs from binary to string */ inaddr.s_addr = ip->ip_src.s_addr; strncpy(srcIP, inet_ntoa(inaddr), sizeof(srcIP)-1); srcIP[sizeof(srcIP)-1] = '\0'; inaddr.s_addr = ip->ip_dst.s_addr; strncpy(dstIP, inet_ntoa(inaddr), sizeof(dstIP)-1); dstIP[sizeof(dstIP)-1] = '\0'; dprint("%s %s: %s: %s:%d -> %s:%d %d bytes\n", pkt_date, pkt_time, proto, srcIP, sport, dstIP, dport, hdr->len); /* clean up expired/completed/failed attempts */ for(lp = attempts; lp; lp = lp->next) { int nix = 0; attempt = (knocker_t*)lp->data; if(attempt->stage >= attempt->door->seqcount) { dprint("removing successful knock attempt (%s)\n", attempt->src); nix = 1; } if(attempt->stage < 0) { dprint("removing failed knock attempt (%s)\n", attempt->src); nix = 1; } if(!nix && (pkt_secs - attempt->seq_start) >= attempt->door->seq_timeout) { if(attempt->srchost) { vprint("%s (%s): %s: sequence timeout (stage %d)\n", attempt->src, attempt->srchost, attempt->door->name, attempt->stage); logprint("%s (%s): %s: sequence timeout (stage %d)\n", attempt->src, attempt->srchost, attempt->door->name, attempt->stage); } else { vprint("%s: %s: sequence timeout (stage %d)\n", attempt->src, attempt->door->name, attempt->stage); logprint("%s: %s: sequence timeout (stage %d)\n", attempt->src, attempt->door->name, attempt->stage); } nix = 1; } if(nix) { knocker_t *k = (knocker_t*)lp->data; /* splice this entry out of the list */ if(lp->prev) lp->prev->next = lp->next; if(lp->next) lp->next->prev = lp->prev; if(lp == attempts) attempts = NULL; lp->prev = lp->next = NULL; free(k->srchost); list_free(lp); continue; } } attempt = NULL; /* look for this guy in our attempts list */ for(lp = attempts; lp; lp = lp->next) { knocker_t *att = (knocker_t*)lp->data; if(!strncmp(att->src, srcIP, sizeof(srcIP)) && !strncmp(att->door->target ? att->door->target : myip, dstIP, sizeof(dstIP))) { attempt = att; break; } } if(attempt) { int flagsmatch = flags_match(attempt->door, ip, tcp); if(flagsmatch && ip->ip_p == attempt->door->protocol[attempt->stage] && dport == attempt->door->sequence[attempt->stage]) { process_attempt(attempt); } else if(flagsmatch == 0) { /* TCP flags didn't match -- just ignore this packet, don't * invalidate the knock. */ } else { /* invalidate the knock sequence, it will be removed in the * next sniff() call. */ attempt->stage = -1; } } else { /* did they hit the first port correctly? */ for(lp = doors; lp; lp = lp->next) { opendoor_t *door = (opendoor_t*)lp->data; /* if we're working with TCP, try to match the flags */ if(!flags_match(door, ip, tcp)) { continue; } if(ip->ip_p == door->protocol[0] && dport == door->sequence[0] && !strcmp(dstIP, door->target ? door->target : myip)) { struct hostent *he; /* create a new entry */ attempt = (knocker_t*)malloc(sizeof(knocker_t)); attempt->srchost = NULL; if(attempt == NULL) { perror("malloc"); exit(1); } strcpy(attempt->src, srcIP); /* try a reverse lookup if enabled */ if (o_lookup) { inaddr.s_addr = ip->ip_src.s_addr; he = gethostbyaddr((void *)&inaddr, sizeof(inaddr), AF_INET); if(he) { attempt->srchost = strdup(he->h_name); } } attempt->stage = 0; attempt->seq_start = pkt_secs; attempt->door = door; attempts = list_add(attempts, attempt); process_attempt(attempt); } } } } /* vim: set ts=2 sw=2 noet: */ knock-0.7/configure0000755000175000017500000051260512345524426013774 0ustar jvinetjvinet#! /bin/sh # Guess values for system-dependent variables and create Makefiles. # Generated by GNU Autoconf 2.69 for knock 0.7. # # Report bugs to . # # # Copyright (C) 1992-1996, 1998-2012 Free Software Foundation, Inc. # # # This configure script is free software; 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We # parameterize here, but still list the modes in the big case below, # to make depend.m4 easier to write. Note that we *cannot* use a case # here, because this file can only contain one case statement. if test "$depmode" = hp; then # HP compiler uses -M and no extra arg. gccflag=-M depmode=gcc fi if test "$depmode" = dashXmstdout; then # This is just like dashmstdout with a different argument. dashmflag=-xM depmode=dashmstdout fi cygpath_u="cygpath -u -f -" if test "$depmode" = msvcmsys; then # This is just like msvisualcpp but w/o cygpath translation. # Just convert the backslash-escaped backslashes to single forward # slashes to satisfy depend.m4 cygpath_u='sed s,\\\\,/,g' depmode=msvisualcpp fi if test "$depmode" = msvc7msys; then # This is just like msvc7 but w/o cygpath translation. # Just convert the backslash-escaped backslashes to single forward # slashes to satisfy depend.m4 cygpath_u='sed s,\\\\,/,g' depmode=msvc7 fi if test "$depmode" = xlc; then # IBM C/C++ Compilers xlc/xlC can output gcc-like dependency information. gccflag=-qmakedep=gcc,-MF depmode=gcc fi case "$depmode" in gcc3) ## gcc 3 implements dependency tracking that does exactly what ## we want. Yay! Note: for some reason libtool 1.4 doesn't like ## it if -MD -MP comes after the -MF stuff. Hmm. ## Unfortunately, FreeBSD c89 acceptance of flags depends upon ## the command line argument order; so add the flags where they ## appear in depend2.am. Note that the slowdown incurred here ## affects only configure: in makefiles, %FASTDEP% shortcuts this. for arg do case $arg in -c) set fnord "$@" -MT "$object" -MD -MP -MF "$tmpdepfile" "$arg" ;; *) set fnord "$@" "$arg" ;; esac shift # fnord shift # $arg done "$@" stat=$? if test $stat -ne 0; then rm -f "$tmpdepfile" exit $stat fi mv "$tmpdepfile" "$depfile" ;; gcc) ## Note that this doesn't just cater to obsosete pre-3.x GCC compilers. ## but also to in-use compilers like IMB xlc/xlC and the HP C compiler. ## (see the conditional assignment to $gccflag above). ## There are various ways to get dependency output from gcc. Here's ## why we pick this rather obscure method: ## - Don't want to use -MD because we'd like the dependencies to end ## up in a subdir. Having to rename by hand is ugly. ## (We might end up doing this anyway to support other compilers.) ## - The DEPENDENCIES_OUTPUT environment variable makes gcc act like ## -MM, not -M (despite what the docs say). Also, it might not be ## supported by the other compilers which use the 'gcc' depmode. ## - Using -M directly means running the compiler twice (even worse ## than renaming). if test -z "$gccflag"; then gccflag=-MD, fi "$@" -Wp,"$gccflag$tmpdepfile" stat=$? if test $stat -ne 0; then rm -f "$tmpdepfile" exit $stat fi rm -f "$depfile" echo "$object : \\" > "$depfile" # The second -e expression handles DOS-style file names with drive # letters. sed -e 's/^[^:]*: / /' \ -e 's/^['$alpha']:\/[^:]*: / /' < "$tmpdepfile" >> "$depfile" ## This next piece of magic avoids the "deleted header file" problem. ## The problem is that when a header file which appears in a .P file ## is deleted, the dependency causes make to die (because there is ## typically no way to rebuild the header). We avoid this by adding ## dummy dependencies for each header file. Too bad gcc doesn't do ## this for us directly. ## Some versions of gcc put a space before the ':'. On the theory ## that the space means something, we add a space to the output as ## well. hp depmode also adds that space, but also prefixes the VPATH ## to the object. Take care to not repeat it in the output. ## Some versions of the HPUX 10.20 sed can't process this invocation ## correctly. Breaking it into two sed invocations is a workaround. tr ' ' "$nl" < "$tmpdepfile" \ | sed -e 's/^\\$//' -e '/^$/d' -e "s|.*$object$||" -e '/:$/d' \ | sed -e 's/$/ :/' >> "$depfile" rm -f "$tmpdepfile" ;; hp) # This case exists only to let depend.m4 do its work. It works by # looking at the text of this script. This case will never be run, # since it is checked for above. exit 1 ;; sgi) if test "$libtool" = yes; then "$@" "-Wp,-MDupdate,$tmpdepfile" else "$@" -MDupdate "$tmpdepfile" fi stat=$? if test $stat -ne 0; then rm -f "$tmpdepfile" exit $stat fi rm -f "$depfile" if test -f "$tmpdepfile"; then # yes, the sourcefile depend on other files echo "$object : \\" > "$depfile" # Clip off the initial element (the dependent). Don't try to be # clever and replace this with sed code, as IRIX sed won't handle # lines with more than a fixed number of characters (4096 in # IRIX 6.2 sed, 8192 in IRIX 6.5). We also remove comment lines; # the IRIX cc adds comments like '#:fec' to the end of the # dependency line. tr ' ' "$nl" < "$tmpdepfile" \ | sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' \ | tr "$nl" ' ' >> "$depfile" echo >> "$depfile" # The second pass generates a dummy entry for each header file. tr ' ' "$nl" < "$tmpdepfile" \ | sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' -e 's/$/:/' \ >> "$depfile" else make_dummy_depfile fi rm -f "$tmpdepfile" ;; xlc) # This case exists only to let depend.m4 do its work. It works by # looking at the text of this script. This case will never be run, # since it is checked for above. exit 1 ;; aix) # The C for AIX Compiler uses -M and outputs the dependencies # in a .u file. In older versions, this file always lives in the # current directory. Also, the AIX compiler puts '$object:' at the # start of each line; $object doesn't have directory information. # Version 6 uses the directory in both cases. set_dir_from "$object" set_base_from "$object" if test "$libtool" = yes; then tmpdepfile1=$dir$base.u tmpdepfile2=$base.u tmpdepfile3=$dir.libs/$base.u "$@" -Wc,-M else tmpdepfile1=$dir$base.u tmpdepfile2=$dir$base.u tmpdepfile3=$dir$base.u "$@" -M fi stat=$? if test $stat -ne 0; then rm -f "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3" exit $stat fi for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3" do test -f "$tmpdepfile" && break done aix_post_process_depfile ;; tcc) # tcc (Tiny C Compiler) understand '-MD -MF file' since version 0.9.26 # FIXME: That version still under development at the moment of writing. # Make that this statement remains true also for stable, released # versions. # It will wrap lines (doesn't matter whether long or short) with a # trailing '\', as in: # # foo.o : \ # foo.c \ # foo.h \ # # It will put a trailing '\' even on the last line, and will use leading # spaces rather than leading tabs (at least since its commit 0394caf7 # "Emit spaces for -MD"). "$@" -MD -MF "$tmpdepfile" stat=$? if test $stat -ne 0; then rm -f "$tmpdepfile" exit $stat fi rm -f "$depfile" # Each non-empty line is of the form 'foo.o : \' or ' dep.h \'. # We have to change lines of the first kind to '$object: \'. sed -e "s|.*:|$object :|" < "$tmpdepfile" > "$depfile" # And for each line of the second kind, we have to emit a 'dep.h:' # dummy dependency, to avoid the deleted-header problem. sed -n -e 's|^ *\(.*\) *\\$|\1:|p' < "$tmpdepfile" >> "$depfile" rm -f "$tmpdepfile" ;; ## The order of this option in the case statement is important, since the ## shell code in configure will try each of these formats in the order ## listed in this file. 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Use a locking strategy to avoid stomping on # the same $tmpdepfile. lockdir=$base.d-lock trap " echo '$0: caught signal, cleaning up...' >&2 rmdir '$lockdir' exit 1 " 1 2 13 15 numtries=100 i=$numtries while test $i -gt 0; do # mkdir is a portable test-and-set. if mkdir "$lockdir" 2>/dev/null; then # This process acquired the lock. "$@" -MD stat=$? # Release the lock. rmdir "$lockdir" break else # If the lock is being held by a different process, wait # until the winning process is done or we timeout. while test -d "$lockdir" && test $i -gt 0; do sleep 1 i=`expr $i - 1` done fi i=`expr $i - 1` done trap - 1 2 13 15 if test $i -le 0; then echo "$0: failed to acquire lock after $numtries attempts" >&2 echo "$0: check lockdir '$lockdir'" >&2 exit 1 fi if test $stat -ne 0; then rm -f "$tmpdepfile" exit $stat fi rm -f "$depfile" # Each line is of the form `foo.o: dependent.h', # or `foo.o: dep1.h dep2.h \', or ` dep3.h dep4.h \'. # Do two passes, one to just change these to # `$object: dependent.h' and one to simply `dependent.h:'. sed "s,^[^:]*:,$object :," < "$tmpdepfile" > "$depfile" # Some versions of the HPUX 10.20 sed can't process this invocation # correctly. Breaking it into two sed invocations is a workaround. sed 's,^[^:]*: \(.*\)$,\1,;s/^\\$//;/^$/d;/:$/d' < "$tmpdepfile" \ | sed -e 's/$/ :/' >> "$depfile" rm -f "$tmpdepfile" ;; hp2) # The "hp" stanza above does not work with aCC (C++) and HP's ia64 # compilers, which have integrated preprocessors. 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Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Library General Public License instead.) You can apply it to your programs, too. When we speak of free software, we are referring to freedom, not price. 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GNU GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 0. This License applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License. The "Program", below, refers to any such program or work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter, translation is included without limitation in the term "modification".) Each licensee is addressed as "you". Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents constitute a work based on the Program (independent of having been made by running the Program). Whether that is true depends on what the Program does. 1. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of warranty; keep intact all the notices that refer to this License and to the absence of any warranty; and give any other recipients of the Program a copy of this License along with the Program. You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection in exchange for a fee. 2. You may modify your copy or copies of the Program or any portion of it, thus forming a work based on the Program, and copy and distribute such modifications or work under the terms of Section 1 above, provided that you also meet all of these conditions: a) You must cause the modified files to carry prominent notices stating that you changed the files and the date of any change. b) You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this License. c) If the modified program normally reads commands interactively when run, you must cause it, when started running for such interactive use in the most ordinary way, to print or display an announcement including an appropriate copyright notice and a notice that there is no warranty (or else, saying that you provide a warranty) and that users may redistribute the program under these conditions, and telling the user how to view a copy of this License. (Exception: if the Program itself is interactive but does not normally print such an announcement, your work based on the Program is not required to print an announcement.) These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived from the Program, and can be reasonably considered independent and separate works in themselves, then this License, and its terms, do not apply to those sections when you distribute them as separate works. But when you distribute the same sections as part of a whole which is a work based on the Program, the distribution of the whole must be on the terms of this License, whose permissions for other licensees extend to the entire whole, and thus to each and every part regardless of who wrote it. Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely by you; rather, the intent is to exercise the right to control the distribution of derivative or collective works based on the Program. In addition, mere aggregation of another work not based on the Program with the Program (or with a work based on the Program) on a volume of a storage or distribution medium does not bring the other work under the scope of this License. 3. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under the terms of Sections 1 and 2 above provided that you also do one of the following: a) Accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, c) Accompany it with the information you received as to the offer to distribute corresponding source code. (This alternative is allowed only for noncommercial distribution and only if you received the program in object code or executable form with such an offer, in accord with Subsection b above.) The source code for a work means the preferred form of the work for making modifications to it. For an executable work, complete source code means all the source code for all modules it contains, plus any associated interface definition files, plus the scripts used to control compilation and installation of the executable. However, as a special exception, the source code distributed need not include anything that is normally distributed (in either source or binary form) with the major components (compiler, kernel, and so on) of the operating system on which the executable runs, unless that component itself accompanies the executable. If distribution of executable or object code is made by offering access to copy from a designated place, then offering equivalent access to copy the source code from the same place counts as distribution of the source code, even though third parties are not compelled to copy the source along with the object code. 4. You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense or distribute the Program is void, and will automatically terminate your rights under this License. However, parties who have received copies, or rights, from you under this License will not have their licenses terminated so long as such parties remain in full compliance. 5. You are not required to accept this License, since you have not signed it. However, nothing else grants you permission to modify or distribute the Program or its derivative works. These actions are prohibited by law if you do not accept this License. Therefore, by modifying or distributing the Program (or any work based on the Program), you indicate your acceptance of this License to do so, and all its terms and conditions for copying, distributing or modifying the Program or works based on it. 6. Each time you redistribute the Program (or any work based on the Program), the recipient automatically receives a license from the original licensor to copy, distribute or modify the Program subject to these terms and conditions. You may not impose any further restrictions on the recipients' exercise of the rights granted herein. You are not responsible for enforcing compliance by third parties to this License. 7. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason (not limited to patent issues), conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot distribute so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not distribute the Program at all. For example, if a patent license would not permit royalty-free redistribution of the Program by all those who receive copies directly or indirectly through you, then the only way you could satisfy both it and this License would be to refrain entirely from distribution of the Program. If any portion of this section is held invalid or unenforceable under any particular circumstance, the balance of the section is intended to apply and the section as a whole is intended to apply in other circumstances. It is not the purpose of this section to induce you to infringe any patents or other property right claims or to contest validity of any such claims; this section has the sole purpose of protecting the integrity of the free software distribution system, which is implemented by public license practices. Many people have made generous contributions to the wide range of software distributed through that system in reliance on consistent application of that system; it is up to the author/donor to decide if he or she is willing to distribute software through any other system and a licensee cannot impose that choice. This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License. 8. If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted interfaces, the original copyright holder who places the Program under this License may add an explicit geographical distribution limitation excluding those countries, so that distribution is permitted only in or among countries not thus excluded. In such case, this License incorporates the limitation as if written in the body of this License. 9. The Free Software Foundation may publish revised and/or new versions of the General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies a version number of this License which applies to it and "any later version", you have the option of following the terms and conditions either of that version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of this License, you may choose any version ever published by the Free Software Foundation. 10. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are different, write to the author to ask for permission. For software which is copyrighted by the Free Software Foundation, write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of software generally. NO WARRANTY 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. END OF TERMS AND CONDITIONS Appendix: How to Apply These Terms to Your New Programs If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) 19yy 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., 675 Mass Ave, Cambridge, MA 02139, USA. Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) 19yy name of author Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. , 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Library General Public License instead of this License.